Switching power supply utilizing switch-selectable resistors to determine output voltage
First Claim
1. A power supply comprising:
- a terminal for receiving a DC voltage;
a transformer having a primary winding and a secondary winding;
a switching circuit coupled between the terminal and the primary winding for providing alternating current to the primary winding;
a rectifier circuit coupled to the secondary winding to provide a DC output voltage;
a controller circuit for controlling the switching circuit to modulate the alternating current provided to the primary winding; and
a circuit receiving first and second input signals, the first input signal having a magnitude which is determined by the DC output voltage, the second input signal having a magnitude determined by a selected position of a multiposition switch, and an output of the circuit generating a feedback signal which is coupled to the controller circuit.
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Accused Products
Abstract
A switching power supply includes a source of DC voltage and a transformer having primary and secondary windings. A switching circuit is coupled between the DC voltage and the primary winding to provide alternating current to the primary winding. A rectifier circuit is coupled to the secondary winding to provide a DC output voltage. A controller circuit controls the switching circuit to modulate the alternating current provided to the primary winding. A circuit receives a first input signal having a magnitude which is determined by the DC output voltage and a second input signal having a magnitude which is determined by a selected position of a multiposition switch. An output of the circuit generates a feedback signal which is coupled to the controller circuit.
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Citations
9 Claims
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1. A power supply comprising:
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a terminal for receiving a DC voltage;
a transformer having a primary winding and a secondary winding;
a switching circuit coupled between the terminal and the primary winding for providing alternating current to the primary winding;
a rectifier circuit coupled to the secondary winding to provide a DC output voltage;
a controller circuit for controlling the switching circuit to modulate the alternating current provided to the primary winding; and
a circuit receiving first and second input signals, the first input signal having a magnitude which is determined by the DC output voltage, the second input signal having a magnitude determined by a selected position of a multiposition switch, and an output of the circuit generating a feedback signal which is coupled to the controller circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification