Switching power supply sampling circuit, switching power supply and household electrical appliance
A switching power supply and sampling circuit technology, applied in the direction of measuring current/voltage, instruments, electrical components, etc., can solve the problem of occupying a large area of PCB, and achieve the effect of reducing design cost and difficulty of circuit design
Pending Publication Date: 2021-08-27
FOSHAN SHUNDE MIDEA ELECTRONICS TECH CO LTD +1
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Problems solved by technology
[0003] The main purpose of the present invention is to provide a switching power supply sampling circuit, which aims to solve the problem that the PCB area occupied by the voltage sampling circuit in the switching power supply is too large
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[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0036] In addition, in the present invention, descriptions such as "first", "second" and so on are used for description purposes only, and should not be understood as indicating or implying their relative importance or implicitly indicating the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions of the vari...
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The invention discloses a switching power supply sampling circuit, a switching power supply and a household electrical appliance. The switching power supply sampling circuit comprises a voltage stabilization sampling circuit which is used for being connected with the output end of a power supply circuit, and triggering and outputting a current sampling signal when the output voltage of the power supply circuit is greater than a preset voltage, and a switch amplification circuit, the input end of the switch amplification circuit is connected with the output end of the voltage stabilization sampling circuit, and the output end of the switch amplification circuit is used for being connected with the voltage feedback end of the control circuit; the switching power supply sampling circuit further comprises a switch amplification circuit which is used for performing current amplification and voltage conversion on the current sampling signal and then outputting a voltage feedback signal corresponding to the current magnitude to the control circuit, so that the control circuit adjusts the output voltage of the power supply circuit according to the received voltage feedback signal. According to the technical scheme, the design cost of the sampling circuit in the switching power supply and the occupied area of the sampling circuit on a PCB can be reduced.
Description
technical field [0001] The invention relates to the technical field of switching power supply sampling, in particular to a switching power supply sampling circuit, a switching power supply and household appliances. Background technique [0002] At present, most household appliances use switching power supplies as power supplies. The existing switching power supply adjusts the output voltage value of the power supply circuit by enabling the control circuit to sample and output the voltage sampling signal according to the voltage sampling circuit, thereby realizing the stability of the output voltage Vout of the switching power supply. However, in the prior art, in order to realize the function of the voltage sampling circuit to change the direction of the feedback current, the PCB area occupied by the voltage sampling circuit is too large. Contents of the invention [0003] The main purpose of the present invention is to provide a switching power supply sampling circuit, w...
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IPC IPC(8): G01R19/00H02M1/00
CPCG01R19/00H02M1/00
Inventor 谭华泉王明明
Owner FOSHAN SHUNDE MIDEA ELECTRONICS TECH CO LTD