Method and device for controlling switching power supply
A technology of switching power supply and control method, which is applied in the direction of converting irreversible AC power input to DC power output, etc., can solve the problems of drop, output voltage overshoot, and slow adjustment speed of voltage compensator.
Active Publication Date: 2011-06-01
VERTIV CORP
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Problems solved by technology
[0006] The disadvantage of the above control method is that when the source jumps, the adjustment speed of the voltage compensator is slow, which causes the first sampling signal reference to be too large or too small when the source jumps, and it takes a long time to reach a new stable value
Before the first sampled signal reference reaches a new stable value, the input power is too large or too small due to its large or small value, which causes the output voltage to overshoot or drop
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[0069] Such as Figure 4 As shown, the switching power supply control method of the present invention includes: S1, determining whether the source jumps; S2, acquiring the first sampling signal, and generating a first sampling signal reference according to the determination result; S3, based on the first sampling signal reference The difference with the first sampling signal generates a modulation signal; S4. Generate a control signal for switching a main circuit of the switching power supply based on the modulation signal.
[0070] In step S1, it is preferable to determine whether the source jumps by acquiring input current, input power, input voltage or other electrical signals of the main circuit. Those skilled in the art are familiar with and able to use various methods to determine source hopping.
[0071] In step S2, a first sampling signal reference may be generated based on the source hopping, and the first sampling signal may be acquired. In one embodiment of the pr...
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The invention relates to a method and a device for controlling a switching power supply. The method comprises the following steps of: A, judging whether a source hops or not; B, acquiring a first sampling signal, and generating a first sampling signal reference according to a judgment result; C, generating a modulation signal based on a difference between the first sampling signal reference and the first sampling signal; and D, generating a control signal of a main circuit switch of the switching power supply based on the modulation signal. In the method and the device for controlling the switching power supply, the first sampling signal reference is ensured to be generated according to the hopping of the source when the source hops to generate the control signal, thereby rapidly giving a response to the hopping of the source and keeping constant an output voltage.
Description
technical field [0001] The present invention relates to the technical field of switching power supplies, and more specifically, to a control method and device for switching power supplies. Background technique [0002] A switching power supply circuit is a voltage conversion circuit, mainly used for step-up and step-down, and is widely used in modern electronic products. A switching power supply generally includes a main circuit and a control circuit. The control circuit samples the signal of the main circuit, adopts a certain control method and device, converts the signal of the main circuit into a control signal, and controls the operation of the main circuit. [0003] The control circuit of the switching power supply in the prior art is as figure 1 and figure 2 shown. [0004] figure 1 It is a schematic diagram of a switching power supply control circuit in the prior art. The control method adopted is to generate the first sampling signal reference through the volt...
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IPC IPC(8): H02M7/02
Inventor 姜轶峰
Owner VERTIV CORP