Charger circuit and PWM controller thereof
First Claim
1. A PWM controller, comprising the characteristic that a short circuit mode circuit has input ends connecting respectively and simultaneously to a power supply input end and an output end of an output driving circuit, and an oscillator which has a temperature compensation circuit which includes a medium value multi-transistor resistor of a negative temperature coefficient and a well resistor of a positive temperature coefficient.
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Abstract
A PWM controller includes a short circuit mode circuit which has input ends connecting simultaneously to a power supply input end and an output end of an output driving circuit, and an oscillator which has a temperature compensation circuit that includes a medium value multi-transistor resistor of a negative temperature coefficient and a well resistor of a positive temperature coefficient. The invention also provides a charger circuit which includes the PWM controller set forth above and a constant voltage/current control circuit coupling with the PWM controller through a transformer. A system adopting the PWM controller circuit and charger circuit of the invention does not need a voltage stabilization diode now equipped in many conventional designs. The invention provides an improved short circuit protection and eliminates low frequency harmonic waves.
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Citations
9 Claims
- 1. A PWM controller, comprising the characteristic that a short circuit mode circuit has input ends connecting respectively and simultaneously to a power supply input end and an output end of an output driving circuit, and an oscillator which has a temperature compensation circuit which includes a medium value multi-transistor resistor of a negative temperature coefficient and a well resistor of a positive temperature coefficient.
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5. A charger circuit comprising a PWM controller and a constant voltage and constant current control circuit coupled with the PWM controller through a transformer, wherein:
the PWM controller has a short circuit mode circuit which has input ends connecting respectively and simultaneously to a power supply input end and an output end of an output driving circuit, and an oscillator which has a temperature compensation circuit which includes a medium value multi-transistor resistor of a negative temperature coefficient and a well resistor of a positive temperature coefficient. - View Dependent Claims (6, 7, 8, 9)
Specification