Protection circuit for power supply
First Claim
1. A protection circuit for power supply, the power supply includes a power conversion unit and said power conversion unit includes a primary winding and a secondary winding;
- said primary winding receives an input voltage; and
said secondary winding is used for generating an output voltage, and said protection circuit comprising;
a first impedance unit, coupled to said secondary winding of said power conversion unit, a loading current of said power supply flowing through said first impedance unit, and said output voltage generated at said first impedance unit;
a second impedance unit, coupled to said secondary winding of said power conversion unit, and generating a reference voltage;
a comparison unit, coupled to said first impedance unit and said second impedance unit, and comparing said output voltage and said reference voltage to generate a protection signal for turning off said power supply; and
an adjustment unit, coupled to said second impedance unit and said comparison unit, generating a reference current to adjust the magnitude of said reference voltage for controlling said comparison unit to output said protection signal.
1 Assignment
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Accused Products
Abstract
A protection circuit for power supply is disclosed. The power supply includes a power conversion unit having a primary winding and a secondary winding. The primary winding receives an input voltage. The secondary winding is used for generating an output voltage. The protection circuit comprises a first impedance unit coupled to the secondary winding. A loading current of the power supply flows through the first impedance unit. The output voltage is generated at the first impedance unit. A second impedance unit is coupled to the secondary winding and generates a reference voltage. A comparison unit compares the output voltage and the reference voltage to generate a protection signal for turning off the power supply. A adjustment unit is coupled to the second impedance unit and the comparison unit and adjusts the magnitude of the reference voltage for controlling the comparison unit to output the protection signal.
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Citations
10 Claims
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1. A protection circuit for power supply, the power supply includes a power conversion unit and said power conversion unit includes a primary winding and a secondary winding;
- said primary winding receives an input voltage; and
said secondary winding is used for generating an output voltage, and said protection circuit comprising;a first impedance unit, coupled to said secondary winding of said power conversion unit, a loading current of said power supply flowing through said first impedance unit, and said output voltage generated at said first impedance unit; a second impedance unit, coupled to said secondary winding of said power conversion unit, and generating a reference voltage; a comparison unit, coupled to said first impedance unit and said second impedance unit, and comparing said output voltage and said reference voltage to generate a protection signal for turning off said power supply; and an adjustment unit, coupled to said second impedance unit and said comparison unit, generating a reference current to adjust the magnitude of said reference voltage for controlling said comparison unit to output said protection signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- said primary winding receives an input voltage; and
Specification