Control method and device of switch power supply
A technology of switching power supply and control method, which is applied in the direction of converting irreversible AC power input into 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 load 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 load 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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[0053] Such as Figure 4 As shown, the switching power supply control method of the present invention includes: S1, determining whether the load jumps; S2, generating a first sampling signal reference according to the determination result, and obtaining the first sampling signal; S3, based on the first sampling signal reference The difference with the first sampling signal generates a modulation signal; S4. Generate a control signal of a main circuit switch based on the modulation signal.
[0054] In step S1, it may preferably be determined whether a load jump occurs by acquiring load current, load power or other load electrical signals. Those skilled in the art are familiar with and can use various methods to determine the jump of the load.
[0055] In step S2, a first sampling signal reference may be generated based on the load jump signal, and a first sampling signal may be acquired. In one embodiment of the present invention, when the load does not jump, the output volta...
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The invention relates to a control method and device for a switch power supply, wherein the control method comprises the steps of: A. judging whether the load jumps; B. obtaining a first sampling signal and generating a first sampling signal reference according to the judgment; C. generating a modulation signal according to the difference between the first sampling signal reference and the first sampling signal; and D. generating a control signal for a main circuit switch according to the modulation signal. By implementing the control method and device of the switch power supply, the first sampling signal reference is ensured to be generated according to the load jump when the load changes suddenly, and the control signal is further generated, thus the control device can respond to the sudden change of load quickly and control the output voltage to be unchanged.
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