Two-stage switching power supply
First Claim
1. A two-stage switching power supply for receiving an input voltage and generating an output voltage, said two-stage switching power supply comprising:
- a first-stage power circuit connected to a power bus for receiving an input voltage, and comprising a first switching circuit, wherein said input voltage is converted into a bus voltage by conducting or shutting off said first switching circuit;
a second-stage power circuit connected to said power bus for receiving said bus voltage, and comprising a second switching circuit, wherein said bus voltage is converted into said output voltage by conducting or shutting off said second switching circuit;
an output detecting circuit connected to said second-stage power circuit and generating an output detecting signal according to said output voltage and/or an output current; and
a power control unit connected to a control terminal of said first switching circuit of said first-stage power circuit and a control terminal of said second switching circuit of said second-stage power circuit for controlling operations of said first switching circuit and said second switching circuit according to said output detecting signal, wherein a first-stage voltage gain value of said first-stage power circuit and a second-stage voltage gain value of said second-stage power circuit are altered as said output detecting signal is changed, so that said output voltage or said output current is maintained at a rated value, wherein said bus voltage is dynamically adjusted according to said output detecting signal.
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Accused Products
Abstract
A two-stage switching power supply includes a first-stage power circuit, a second-stage power circuit, an output detecting circuit and a power control unit. The first-stage power circuit includes a first switching circuit. By conducting or shutting off the first switching circuit, an input voltage is converted into a bus voltage. The second-stage power circuit includes a second switching circuit. By conducting or shutting off the second switching circuit, the bus voltage is converted into an output voltage. The output detecting circuit generates an output detecting signal according to the output voltage. The power control unit controls operations of the first and second switching circuits according to the output detecting signal. A first-stage voltage gain value of the first-stage power circuit and a second-stage voltage gain value of the second-stage power circuit are altered with the output detecting signal, so that the output voltage is maintained at a rated value.
30 Citations
20 Claims
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1. A two-stage switching power supply for receiving an input voltage and generating an output voltage, said two-stage switching power supply comprising:
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a first-stage power circuit connected to a power bus for receiving an input voltage, and comprising a first switching circuit, wherein said input voltage is converted into a bus voltage by conducting or shutting off said first switching circuit; a second-stage power circuit connected to said power bus for receiving said bus voltage, and comprising a second switching circuit, wherein said bus voltage is converted into said output voltage by conducting or shutting off said second switching circuit; an output detecting circuit connected to said second-stage power circuit and generating an output detecting signal according to said output voltage and/or an output current; and a power control unit connected to a control terminal of said first switching circuit of said first-stage power circuit and a control terminal of said second switching circuit of said second-stage power circuit for controlling operations of said first switching circuit and said second switching circuit according to said output detecting signal, wherein a first-stage voltage gain value of said first-stage power circuit and a second-stage voltage gain value of said second-stage power circuit are altered as said output detecting signal is changed, so that said output voltage or said output current is maintained at a rated value, wherein said bus voltage is dynamically adjusted according to said output detecting signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification