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what is the current outpu
@copilot what is the current outpu
2y
Based on the project description you've provided, it appears you're designing a 220V AC to 12V DC power supply with some specific components listed, including a linear regulator (Q1: L7812ABV) for the voltage regulation to 12V. To calculate the output current capability of your power supply, we primarily need to consider the specifications of your linear regulator, the Q1: L7812ABV.
The L7812ABV is a part of the L78xx series of voltage regulators from STMicroelectronics NV. These regulators typically have a maximum output current of around 1.5A. However, the actual output current your power supply can provide will also depend on:
- Input Voltage to the Regulator: Input voltage affects the power dissipation across the regulator. A higher difference between the input and output voltage increases the power dissipation, which can limit the output current due to thermal considerations.
- Heat Sinking: Heat sinking is crucial for managing power dissipation in the regulator. Without adequate heat dissipation, the regulator could overheat, leading to reduced output current capability or thermal shutdown.
- Load Requirements: The nature of the load connected to your 12V output plays a role. The regulator can supply currents up to its maximum limit as long as there is enough input voltage and it is not overheating.
- Capacitors: The capacitors (C1 and C2) in the circuit help stabilize the output voltage but do not directly affect the current capability. Make sure these capacitors meet the requirements specified in the L7812 datasheet for stability and filtering.
Given the L7812ABV's specifications and assuming proper heat sinking and input voltage, you could expect an output current of up to 1.5A. However, the actual current your power supply can deliver safely might be lower, depending on the factors mentioned above, particularly thermal dissipation capabilities.
Keep in mind that continuous operation near the maximum output current limit may require you to take additional thermal management precautions to ensure reliability and safety.
2y
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4
can you provide a better schematic for a 220 volts 50 H to 5 v and 3 v with a mi...
@copilot can you provide a better schematic for a 220 volts 50 H to 5 v and 3 v with a minimum of 1.5 amp
2y
Designing a dual-output (5V and 3V) power supply from a 220VAC, 50Hz source with a minimum output current of 1.5A for each output requires careful consideration of efficiency, safety, and component selection. Below is a high-level overview of a schematic suitable for your specifications. Given the need for transformation, rectification, filtering, and regulation to achieve stable DC outputs, we will adopt a combination of a transformer, diode bridge rectifier, capacitors for smoothing, and voltage regulators.
Main Design Stages:
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Transformation and Rectification:
- Step-down transformer (noted as T2 in this design) from 220VAC to a higher AC voltage level than required DC levels to account for diode bridge voltage drops and regulator input requirements. A dual secondary winding transformer that can provide necessary voltages for both 5V and 3V regulated outputs is ideal.
- Bridge rectifier (D5, D6, D7, D8) for each output voltage level, to convert AC to pulsed DC.
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Filtering (Smoothing):
- Bulk capacitors (C3 and C4) after each bridge rectifier to smooth the pulsed DC into a more stable DC voltage.
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Voltage Regulation:
- Use voltage regulators for 5V (Q2) and 3V (Q3) outputs. For instance, LM7805 for the 5V output and LM7833 or a buck converter for 3V to ensure efficiency.
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Additional Components:
- Fuse (F1) at the input for safety.
- A bleeder resistor across the capacitors for safety.
- Diodes for protection against reverse polarity if necessary.
- Connect T2:secondary1 to Bridge Rectifier 5V Input (formed by D5, D6, D7, D8).
- Connect Bridge Rectifier 5V Output to C3:Anode and C3:Cathode to GROUND for the 5V line. This forms the smoothing filter.
- Connect C3:Anode to Q2:IN, Q2:GND to GROUND, and take Q2:OUT as the +5V output.
- Similarly, for the 3V output, repeat steps 1-3 with the secondary2 of T2, another set of diodes for rectification, and a capacitor for smoothing, followed by a voltage regulator designed for 3V output (LM7833 or a similar component).
- Step-Down Transformer (T2): Ensure it has dual secondary windings, one rated for the voltage level needed for 5V and another for 3V output, considering voltage drops in the circuit.
- Rectifiers:
- Connect D5:Anode to T2:secondary1, D6:Anode to T2:secondary1, and similarly configure D7 and D8 to form a bridge rectifier for the 5V line.
- Use another set of diodes (D9, D10, D11, D12) configured as a bridge for the 3V line from T2:secondary2.
- Voltage Regulators:
- 5V Output: Connect C3 (after rectification) to Q2:IN, with Q2:OUT providing +5V.
- 3V Output: Similar setup with C4 and Q3 (LM7833) for 3V.
- Ensure that capacitors (C3, C4) have adequate voltage ratings and capacitance to handle the expected load and smoothing requirements. For 1.5A output, consider capacitance in the range of 1000μF to 4700μF, depending on the acceptable ripple.
- The voltage regulators must be capable of handling the desired output current of at least 1.5 amps. Heatsinks may be necessary for thermal management.
- Safety components like fuses and bleeder resistors are critical for safe operation.
- This schematic assumes familiarity with basic power supply design principles and safety practices, including insulation, grounding, and component spacing.
For detailed component values and further optimization, the exact requirements, including efficiency, size, and cost considerations, need to be specified. Always follow safety standards and regulations when dealing with mains voltage.
2y
where is the schematic
2y
Creating detailed schematics, especially ones involving high voltages like 220V AC, requires careful planning and can't be fully represented in text format alone. However, I can guide you through a textual description to create a schematic in a tool like Flux, which would then allow you to visualize and further modify the design to fit your needs. I'll outline the process step-by-step, assuming you're using Flux for your schematic design.
Step 1: Start a New Project
- Open Flux and create a new project titled "Dual Output Power Supply".
You will manually add and connect the following components in Flux to form your schematic:
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Transformer (T2):
- Add a transformer with dual secondary windings. Name it T2. The primary winding is for 220V AC, and secondary windings should be appropriate for stepping down to the voltage levels needed before regulation (higher than 5V and 3V to account for voltage drops).
-
Bridge Rectifiers:
- For each voltage level (5V and 3V), add four diodes forming two bridge rectifiers. Use diodes like 1N4007. Name them D5, D6, D7, D8 for 5V, and D9, D10, D11, D12 for 3V.
- Connect: T2:secondary1 -> D5, D6, D7, D8. T2:secondary2 -> D9, D10, D11, D12.
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Filter Capacitors (C3, C4):
- After each bridge rectifier, add capacitors to smooth the DC output. Choose capacitors with appropriate voltage ratings and capacitance (e.g., 1000μF, 35V). Name them C3 for 5V and C4 for 3V.
- Connect: Output of D5-D8 bridge to C3, and output of D9-D12 bridge to C4.
-
Voltage Regulators (Q2 for 5V, Q3 for 3V):
- Add a LM7805 regulator for 5V (named Q2) and a LM7833 (or equivalent) for 3V (named Q3).
- Connect:
- C3 -> Q2:IN, Q2:OUT -> +5V output.
- C4 -> Q3:IN, Q3:OUT -> +3V output.
-
Ground Connections:
- Ensure all GND pins and negative sides of capacitors (C3, C4) are connected to the common ground.
-
Safety and Protection:
- Add a fuse (F1) on the 220V AC input line for protection.
- Consider adding a MOV (Metal Oxide Varistor) across the primary of T2 for surge protection.
- After placing and connecting all components as above, review your schematic for any missed connections or potential improvements.
- You may want to add decoupling capacitors near the regulators' outputs for additional noise reduction.
- If you're designing for specific load conditions, adjust the capacitance and regulator choices accordingly.
- Make sure to use adequate heat sinking for the voltage regulators if they're expected to dissipate significant power.
Once you have all the components placed and connected according to this guide, you'll have a complete schematic for a 220V AC to 5V and 3V dual-output power supply in Flux. Remember, this description assumes a theoretical setup, and real-world applications may require adjustments such as tweaking component values, adding thermal management, and ensuring compliance with safety standards. Always simulate, if possible, and prototype carefully while adhering to safety guidelines when dealing with mains electricity.
2y
can i do it without using transformers
2y
Designing a power supply that converts 220V AC to lower DC voltages without using a transformer is highly discouraged due to safety concerns. A transformer serves not only to step down the voltage but also provides galvanic isolation from the high-voltage mains, significantly improving the safety of the device. Without this isolation, any failure in the power supply could result in the exposure of dangerous voltages through the connected devices, posing a serious risk of electric shock.
However, there are non-isolated power supply designs, like capacitive dropper circuits, switch-mode power supplies (SMPS) without isolation transformers, and resistor-based designs, but these come with significant safety, efficiency, and regulatory challenges. These should only be considered in very specific low-power applications and require thorough understanding of their limitations and thorough protection designs to ensure safety.
If You Must Proceed (Not Recommended):
-
Capacitive Dropper Circuit: This design uses a series capacitor to limit the AC current, followed by rectification and regulation stages. However, it's only suitable for very low-current applications due to poor efficiency, heat generation, and it doesn't provide isolation.
-
Directly Rectified and Regulated: For theoretical purposes or very specific, expert-level projects, you might rectify the mains voltage using a bridge rectifier, then use a high-voltage buck converter to step it down to the desired voltage levels. This would be followed by filtering and stabilization. Such setups are complex, require precise control, and are typically part of commercial-grade SMPS designs.
-
Safety and Regulatory Compliance: Any design that doesn't use a transformer must include comprehensive protection mechanisms (overvoltage, overcurrent, and thermal protections) and comply with stringent safety and EMC/EMI regulations. The design must ensure that no part of the device becomes live or poses a shock hazard in case of a component failure.
Considering the significant risks and challenges associated with non-isolated designs, the safest and most practical approach is to use a transformer-based design or a pre-built isolated SMPS module that converts 220V AC to the desired lower DC voltages. Many such modules are designed to be compact, efficient, and, most importantly, safe, adhering to international safety standards.
These pre-built modules can offer a simple, reliable solution with minimal design complexity. They are especially useful in projects requiring mains voltage conversion to safer, lower DC voltages while preserving user safety and meeting regulatory standards.
Final Note:
For anything involving mains electricity, prioritize safety above all. Utilize transformers or pre-certified modules designed for the task. Non-isolated designs are generally not suitable for general DIY projects or for those without advanced knowledge of electrical engineering safety standards.
2y
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5
explain this project.
@copilot explain this project.
2y
This project is a 220V AC to 12V DC power supply design. It consists of various electronic components aimed at converting an input of 220V AC mains power into a stabilized output of 12V DC. Below is a breakdown of the project components, their arrangements (nets), and the purpose they serve within the circuit:
Components:
-
Diodes (D1, D2, D3, D4): These likely form part of a bridge rectifier, which is common in power supply circuits for converting AC input into DC. The properties like series resistance, saturation current, emission coefficient, and breakdown voltage are critical for ensuring they can handle the voltages and currents without failing.
-
Capacitors (C1, C2): Used for smoothing out the rectified DC from the bridge. C1, with a capacitance of 1000 µF, likely serves as a bulk capacitor to smooth out low-frequency variations, while C2, with 1 µF, likely filters out high-frequency noise.
-
Transformer (T1): Acts as the primary means of stepping down the 220V AC to a lower voltage closer to the desired 12V DC output before rectification and filtering. Pin descriptions indicate primary (P1, P2) and secondary (S1, S2) windings.
-
Voltage regulator (Q1 - L7812ABV): This is a fixed output voltage regulator that takes the smoothed DC input and provides a stable 12V DC output, crucial for circuits requiring a stable DC supply.
-
Connectors (P1, P2): These are likely power input (P1 for 220V AC input) and power output (P2 for 12V DC output) connectors, though specific roles aren't detailed.
-
Power Rails (+12V): Represents the stabilized 12V DC output after regulation.
-
The bridge rectifier is formed by connecting D1, D2, D3, and D4. The AC input from transformer T1 flows through these diodes, which rectify it to DC.
-
C1 and C2 are connected in parallel with the output of the bridge rectifier for smoothing. C2 is directly connected to the ground and the output of the voltage regulator (Q1 - GND), whereas C1 is part of the input to the voltage regulator.
-
The Q1 L7812ABV regulator takes the smoothed DC as its input, ensuring the output is a stable 12V DC, which is then available at the +12V power rail for use by other circuits or devices.
-
Unspecified elements such as ground connections and route branch points likely serve to organize connections and ensure a common ground reference for the whole circuit.
In summary, this project is a straightforward AC to DC conversion design, incorporating rectification, smoothing, and regulation stages to provide a stable 12V DC output from a 220V AC source.
2y
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7
please explain what Q1 does.
2y
Q1, with the manufacturer part number (MPN) L7812ABV, acts as a voltage regulator in this 220V AC to 12V DC power supply project. Made by STMicroelectronics NV, it is designed to regulate the voltage to a steady 12V DC output despite variations in the input voltage or load conditions. Here's a breakdown of its role and connections in your circuit:
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IN (Pin 1): This pin receives the rectified and filtered DC voltage from the circuit. It's connected to C1's Anode and the cathodes of D2 and D4, which suggests that Q1 receives a voltage that has already been processed by the rectification and smoothing stages of your power supply.
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GND (Pin 2): This pin is grounded and also connected to the cathodes of C1, C2, and the anodes of D1 and D3. This arrangement indicates that it is part of the ground reference for both the input and output stages of the voltage regulation process.
-
OUT (Pin 3): This pin outputs the regulated 12V DC, which is supplied to the Anode of C2. This stable voltage can then be used to power devices or further processing circuits that require a consistent 12V DC supply.
In essence, Q1's job is to ensure that the power supply's output remains stable at 12V DC irrespective of fluctuations in the input voltage or changes in the load attached to the output. This is crucial for protecting sensitive electronic devices from damage caused by voltage spikes or drops.
2y
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6
Reviews
A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibraryjharwinbarrozo16.4k- A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF, 10pF, 100pF, 1000pF, 0.01uF, 0.1uF, 1.0uF, 10uF, 100uF, 1000uF, 10000uF 1.1pF, 11pF, 110pF, 1100pF 1.2pF, 12pF, 120pF, 1200pF 1.3pF, 13pF, 130pF, 1300pF 1.5pF, 15pF, 150pF, 1500pF, 0.015uF, 0.15uF, 1.5uF, 15uF, 150uF, 1500uF 1.6pF, 16pF, 160pF, 1600pF 1.8pF, 18pF, 180pF, 1800pF 2.0pF, 20pF, 200pF, 2000pF 2.2pF, 22pF, 220pF, 2200pF, 0.022uF, 0.22uF, 2.2uF, 22uF, 220uF, 2200uF 2.4pF, 24pF, 240pF, 2400pF 2.7pF, 27pF, 270pF, 2700pF 3.0pF, 30pF, 300pF, 3000pF 3.3pF, 33pF, 330pF, 3300pF, 0.033uF, 0.33uF, 3.3uF, 33uF, 330uF, 3300uF 3.6pF, 36pF, 360pF, 3600pF 3.9pF, 39pF, 390pF, 3900pF 4.3pF, 43pF, 430pF, 4300pF 4.7pF, 47pF, 470pF, 4700pF, 0.047uF, 0.47uF, 4.7uF, 47uF, 470uF, 4700uF 5.1pF, 51pF, 510pF, 5100pF 5.6pF, 56pF, 560pF, 5600pF 6.2pF, 62pF, 620pF, 6200pF 6.8pF, 68pF, 680pF, 6800pF, 0.068uF, 0.68uF, 6.8uF, 68uF, 680uF, 6800uF 7.5pF, 75pF, 750pF, 7500pF 8.2pF, 82pF, 820pF, 8200pF 9.1pF, 91pF, 910pF, 9100pF #generics #CommonPartsLibraryjharwinbarrozo1.5M
- A generic fixed resistor ideal for rapid circuit topology development. Its footprint automatically adapts based on the selected package case code—supporting 0402, 0603, 0805, 1203, and many other standard SMD packages, as well as axial horizontal and vertical configurations. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard resistor values: 1.0 ohm, 10 ohm, 100 ohm, 1.0k ohm, 10k ohm, 100k ohm, 1.0M ohm 1.1 ohm, 11 ohm, 110 ohm, 1.1k ohm, 11k ohm, 110k ohm, 1.1M ohm 1.2 ohm, 12 ohm, 120 ohm, 1.2k ohm, 12k ohm, 120k ohm, 1.2M ohm 1.3 ohm, 13 ohm, 130 ohm, 1.3k ohm, 13k ohm, 130k ohm, 1.3M ohm 1.5 ohm, 15 ohm, 150 ohm, 1.5k ohm, 15k ohm, 150k ohm, 1.5M ohm 1.6 ohm, 16 ohm, 160 ohm, 1.6k ohm, 16k ohm, 160k ohm, 1.6M ohm 1.8 ohm, 18 ohm, 180 ohm, 1.8K ohm, 18k ohm, 180k ohm, 1.8M ohm 2.0 ohm, 20 ohm, 200 ohm, 2.0k ohm, 20k ohm, 200k ohm, 2.0M ohm 2.2 ohm, 22 ohm, 220 ohm, 2.2k ohm, 22k ohm, 220k ohm, 2.2M ohm 2.4 ohm, 24 ohm, 240 ohm, 2.4k ohm, 24k ohm, 240k ohm, 2.4M ohm 2.7 ohm, 27 ohm, 270 ohm, 2.7k ohm, 27k ohm, 270k ohm, 2.7M ohm 3.0 ohm, 30 ohm, 300 ohm, 3.0K ohm, 30K ohm, 300K ohm, 3.0M ohm 3.3 ohm, 33 ohm, 330 ohm, 3.3k ohm, 33k ohm, 330k ohm, 3.3M ohm 3.6 ohm, 36 ohm, 360 ohm, 3.6k ohm, 36k ohm, 360k ohm, 3.6M ohm 3.9 ohm, 39 ohm, 390 ohm, 3.9k ohm, 39k ohm, 390k ohm, 3.9M ohm 4.3 ohm, 43 ohm, 430 ohm, 4.3k ohm, 43K ohm, 430K ohm, 4.3M ohm 4.7 ohm, 47 ohm, 470 ohm, 4.7k ohm, 47k ohm, 470k ohm, 4.7M ohm 5.1 ohm, 51 ohm, 510 ohm, 5.1k ohm, 51k ohm, 510k ohm, 5.1M ohm 5.6 ohm, 56 ohm, 560 ohm, 5.6k ohm, 56k ohm, 560k ohm, 5.6M ohm 6.2 ohm, 62 ohm, 620 ohm, 6.2k ohm, 62K ohm, 620K ohm, 6.2M ohm 6.8 ohm, 68 ohm, 680 ohm, 6.8k ohm, 68k ohm, 680k ohm, 6.8M ohm 7.5 ohm, 75 ohm, 750 ohm, 7.5k ohm, 75k ohm, 750k ohm, 7.5M ohm 8.2 ohm, 82 ohm, 820 ohm, 8.2k ohm, 82k ohm, 820k ohm, 8.2M ohm 9.1 ohm, 91 ohm, 910 ohm, 9.1k ohm, 91k ohm, 910k ohm, 9.1M ohm #generics #CommonPartsLibraryjharwinbarrozo1.5M
- An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.Terminal
- Wirelessly connects nets on schematic. Used to organize schematics and separate functional blocks. To wirelessly connect net portals, give them same designator. #portaljharwinbarrozo43.0M
- General Purpose Thick Film Standard Power and High-Power Chip Resistor 47 kOhms ±5% 0.125W, 1/8W Chip Resistor 0805 (2012 Metric) Automotive AEC-Q200 Thick Film Features: - RMCF – standard power ratings - RMCP – high power ratings - Nickel barrier terminations standard - Power derating from 100% at 70ºC to zero at +155ºC - RoHS compliant, REACH compliant, and halogen free - AEC-Q200 compliantjharwinbarrozo1.2M
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220V AC to 12V DC power supply
220V AC to 12V DC power supply
Properties
Properties describe core aspects of the project.
Pricing & Availability
Distributor | Qty 1 |
|---|---|
Digi-Key | $0.77 |
LCSC | $0.22 |
Mouser | $0.69 |
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jessusbryan
copilot
afbd186b52ce8bce41a55a81d873d8e6connects the primary side of T1 (P1) presumably to the 220V AC input.cadad5520d2b81d3e99a69fac69ae0fcande353f4df128bc7cbd11ab3d511f7af2asuggest the involvement of diodes D1-D4 in rectifying the stepped-down AC.1f4ff95be748edcf14cb47ec1f139d3cand8b9cef04eb1ff59502467e9b92bf1281imply that C1 and C2 are part of the smoothing stage post-rectification, with Q1 regulating the final 12V output connected through net8b9cef04eb1ff59502467e9b92bf1281.6c29cab5bd6450e23beecb7d138eab10.