Back to results
US 2014/0175903 A1Published application
Discharge circuit for power supply unit
AssigneeHon Hai Precision Industry Co., Ltd.
InventorsHAI-QING ZHOU, YI-XIN TU
Life of this patent
Estimating the term…
Abstract
A discharge circuit includes a pulse width modulator (PWM) chip, a first and second electronic switch, and a resistor. The first electronic switch receives a voltage creep from the PWM chip. When the voltage creep is less than a voltage making the first electronic switch to turned on, the voltage creep is discharged through the resistor and the second electronic switch.
Claims7
A discharge circuit, comprising:
- a pulse width modulator chip comprising a phase output pin coupled to a first terminal of an inductance;
- and
- first and second electronic switches each comprising first to third terminals, wherein the first terminal of the first electronic switch is coupled to a second terminal of the inductance through a first resistor, the second terminal of the first electronic switch is connected to ground, the third terminal of the first electronic switch is coupled to a stand-by power terminal through a second resistor;
- the third terminal of the first electronic switch is coupled to the first terminal of the second electronic switch;
- the second terminal of the second electronic switch is connected to ground, the third terminal of the third electronic switch is coupled to the second terminal of the inductance through a third resistor;
- wherein when the first terminals of the first and second electronic switches are at low-voltage level, the first and second electronic switches are turned on;
- when the first terminals of the first and second electronic switches, the first and second electronic switch are turned off
4 more elements
Dependencies are inferred from the claim text.