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US 12,095,355 B2Granted
Power supply circuit
AssigneeOMRON Corporation
InventorsKohei Tanino, Masaaki Nagano, Tomonori Watanabe
Life of this patent
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Abstract
A power supply circuit includes a transistor having a drain connected to an input voltage, a gate, and a source; a diode; a choke coil; a capacitor; a transformer; a control circuit that provides a drive signal for turning on and off the transistor to a primary winding of the transformer based on an output voltage; an overvoltage detection circuit that outputs an overvoltage signal when the output voltage is an overvoltage; and a short circuit that short-circuits the gate and the source of the transistor in response to the overvoltage signal.
Claims8
A power supply circuit comprising:
- a transistor having a drain connected to an input voltage, a gate, and a source;
- a diode having a cathode connected to the source of the transistor, and an anode connected to a common voltage node;
- a choke coil having a first end connected to the source of the transistor and the cathode of the diode, and a second end connected to an output node;
- a capacitor connected between the output node and the common voltage node;
- a transformer having a primary winding, and a secondary winding connected to the gate of the transistor;
- a control circuit configured to provide a drive signal for turning on and off the transistor, to the primary winding of the transformer, based on an output voltage as a voltage at the output node;
- an overvoltage detection circuit configured to output an overvoltage signal when the output voltage is an overvoltage;
- and
- a short circuit configured to short-circuit the gate and the source of the transistor in response to the overvoltage signal.
6 more elements
Dependencies are inferred from the claim text.