TWO-STAGE SWITCHING POWER SUPPLY
First Claim
1. A two-stage switching power supply for receiving an input voltage and generating an output voltage or an output current to a system circuit, 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 alternately conducting and shutting off said first switching circuit;
a bus capacitor interconnected between said power bus and a first common terminal for storing electrical energy;
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 or said output current by alternately conducting and shutting off said second switching circuit; and
a power control unit connected to a control terminal of said first switching circuit of said first-stage power circuit, a control terminal of said second switching circuit of said second-stage power circuit and a power bus for controlling operations of said first switching circuit and said second switching circuit, wherein said bus voltage is dynamically adjusted according to electricity consumption amount of said system circuit under control of said power control unit, and an operating mode of said second switching circuit of said second-stage power circuit is changed according to said electricity consumption amount of said system circuit.
1 Assignment
0 Petitions
Accused Products
Abstract
A two-stage switching power supply includes a first-stage power circuit, a bus capacitor, a second-stage power circuit and a power control unit. The first-stage power circuit is connected to a power bus for receiving an input voltage, and includes a first switching circuit. The input voltage is converted into a bus voltage by alternately conducting and shutting off the first switching circuit. The second-stage power circuit is connected to the power bus for receiving the bus voltage, and includes a second switching circuit. The power control unit is used for controlling operations of the first switching circuit and the second switching circuit. The bus voltage is dynamically adjusted according to electricity consumption amount of the system circuit under control of the power control unit. An operating mode of the second switching circuit of the second-stage power circuit is changed according to the electricity consumption amount of the system circuit.
47 Citations
24 Claims
-
1. A two-stage switching power supply for receiving an input voltage and generating an output voltage or an output current to a system circuit, 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 alternately conducting and shutting off said first switching circuit; a bus capacitor interconnected between said power bus and a first common terminal for storing electrical energy; 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 or said output current by alternately conducting and shutting off said second switching circuit; and a power control unit connected to a control terminal of said first switching circuit of said first-stage power circuit, a control terminal of said second switching circuit of said second-stage power circuit and a power bus for controlling operations of said first switching circuit and said second switching circuit, wherein said bus voltage is dynamically adjusted according to electricity consumption amount of said system circuit under control of said power control unit, and an operating mode of said second switching circuit of said second-stage power circuit is changed according to said electricity consumption amount of said system circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
-
Specification