Switching power supply with controllable output voltage instant drop and rise amplitude values and method

Abstract

The invention provides a switching power supply with controllable output voltage instant drop and rise amplitude values and a method. The switching power supply with controllable output voltage instant drop and rise amplitude values comprises a controller, a power stage module, a PWM generator, an output voltage sampling module and a threshold value circuit, wherein the threshold value circuit iscoupled to an output end of the output voltage sampling module and an input end of the controller; an overshoot threshold value VH and an undershoot threshold value VL are set in the threshold value circuit; when output voltage Vo drops to enable the sampling voltage Vs to exceed the set undershoot threshold value VL, a reverse input end of the controller is pulled to a zero potential by the threshold value circuit; when the output voltage Vo rises to enable the sampling voltage Vs to exceed a rising threshold value VH, the reverse input end of the controller is heightened by the threshold value circuit; and under the circumstance that existing feedback loop parameters are not affected, output voltage amplitude value mutation caused by load mutation of the switching power supply is relieved effectively, and it can be ensured that the load of the switching power supply is not damaged and the service life is prolonged by a controllable output voltage amplitude value.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a switching power supply with controllable output voltage instantaneous drop and jump amplitude, and a method for realizing the same. Background technique [0002] Switching power supply is a commonly used power supply device. When the load at the output end of the switching power supply is suddenly loaded or unloaded, the output voltage will drop and jump instantaneously. The transient change of this voltage will directly affect the performance and service life of the connected load. In severe cases, it will cause Damage to load equipment. [0003] At present, the common solution to improve this technical problem is to increase the switching frequency of the PWM switch to improve the loop response speed, but with the increase of the switching frequency of the PWM switch, the loss of the power stage module switch tube will be increased, which will affect the overall perfor...

AI Technical Summary

Problems solved by technology

[0002] Switching power supply is a commonly used power supply device. When the load at the output end of the switching power supply is suddenly loaded or unloaded, the output voltage will drop and jump instantaneously. The transient change of this voltage will directly affect the performance and service life of the connected load. In severe cases, it will cause Damage to load equipment

[0003] At present, the common solution to improve this technical problem is to increase the switching frequency of the PWM switch to improve the loop response speed, but with the increase of the switching frequency of the PWM switch, the loss of the power stage module switch tube will be increased, which will affect the overall performance of the whole machine. The second is to improve the response speed of the feedback loop, but it will involve complicated loop design parameters and engineering problems that are difficult to accurately debug

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