Automatic Door Leg Knob Design

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Below is guidance on using MOSFET drivers for controlling the DC motor and replacing the conventional H-bridge, along with recommended components:
  • Efficiency Advantages:
    MOSFET drivers can offer lower conduction losses due to reduced on-resistance, leading to higher efficiency and improved thermal performance compared to typical H-bridge drivers.
  • Implementation Considerations:
    • Driver IC: Use a dedicated MOSFET driver such as the IR2110 MOSFET driver. This driver can control both high side and low side MOSFETs, making it well-suited for a half-bridge configuration.
    • Complementary MOSFETs: You'll need a pair of complementary MOSFETs for each half-bridge leg. A popular choice is to use devices like the IRF540 for low on-resistance and adequate current handling.
    • Supporting Circuitry: Ensure proper gate resistors, free-wheeling diodes (if not integrated), and decoupling capacitors are added to stabilize the driver circuit and protect the components.
Below is an updated component list table addressing the MOSFET driver approach:

Table

ComponentDescriptionSuggested Component & Link
ESP8266 MicrocontrollerProvides the central control with integrated Wi-Fi capability for remote operation.ESP8266
DC Motor with GearboxDelivers the mechanical actuation required for the door knob movement.N20 Micro Gear Motor (or select a servo if desired)
MOSFET Driver ICControls the complementary MOSFETs used in the power stage, reducing conduction loss and improving efficiency.IR2110 MOSFET driver
Complementary MOSFET PairProvides the switching elements needed to create a half-bridge for motor control with low on-resistance.IRF540 (a pair of devices will be required for each half-bridge leg)
Position Feedback SensorDetects the door knob's travel limits ensuring the motor stops appropriately to prevent over-travel.Limit Switch
Ground ComponentEstablishes a common reference across the power and signal circuits.Ground
By replacing the conventional H-bridge with a MOSFET driver configuration, you can achieve a more efficient power stage for your automatic door leg knob design. Ensure all necessary supporting circuitry (e.g., gate resistors, decoupling capacitors) is included to maintain stable operation.
Decoupling capacitor is 100nF
MOSFET selection
driver implementation
323 days

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Automatic door knob

Automatic door knob
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Last updated by darksun
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darksun

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