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Step-down power supply ripple detection and compensation circuit

A power supply ripple and compensation circuit technology, which is applied in power supply testing, electrical components, AC/pulse peak measurement, etc., can solve problems such as short service life and small electrolytic capacitors, and achieve extended service life, strong stability, and realization of ripple The effect of wave current

Active Publication Date: 2016-12-14
深圳新视光电科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the life of electrolytic capacitors is much shorter than that of step-down circuits and other components, resulting in a shorter life of the product

Method used

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  • Step-down power supply ripple detection and compensation circuit
  • Step-down power supply ripple detection and compensation circuit
  • Step-down power supply ripple detection and compensation circuit

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Embodiment Construction

[0018] refer to Figure 1 to Figure 4 , a step-down power supply ripple detection and compensation circuit, connected in parallel with a load behind a DC / DC or AC / DC switching power supply, including: a current ripple acquisition circuit: connected to the inductance L1 of the switching power supply, for collecting the inductance the voltage change signal. Compensation current ripple generation circuit: the input terminal is connected to the output terminal of the current ripple acquisition circuit, and the output terminal is connected to the input terminal of the load, for generating a compensation current opposite to the inductor current of the switching power supply, and superimposed on Input to load LOAD.

[0019] For the schematic circuit diagram of this embodiment, see Figure 2 to Figure 4 , the current ripple acquisition circuit includes an internal circuit and an external circuit. The internal circuit includes a resistor R1, a resistor R2, a capacitor Ci3, an NMOS t...

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Abstract

The invention discloses a step-down power supply ripple detection and compensation circuit, which comprises a current ripple collection circuit and a compensation current ripple generation circuit after a load is connected to a switching power supply in parallel. By an on-chip compensation technology, integral voltage corresponding to inductive current is obtained through integration by collecting a voltage change of an inductor in the switching power supply; compensation current opposite to the inductive current is obtained by differencing the integral voltage and the voltage of the switching power supply; and the obtained compensation current is injected into a primary circuit to offset current fluctuation caused by the inductor in the switching power supply, so that compensation of ripple current is achieved; constant-current output can be achieved only by adding a small-capacity ceramic capacitor and an appropriate resistor; output current is stable and a large electrolytic capacitor is not needed; the disadvantage that the service lifetime of a product is short due to the adopted large electrolytic capacitor with short service lifetime in the prior art can be compensated; the circuit is simple in structure, high in stability, wide in application range and small in volume; and the service lifetime of the product can be effectively prolonged.

Description

technical field [0001] The invention relates to a power supply module, in particular to a step-down DC power supply ripple compensation module. Background technique [0002] BUCK switching power supply circuit is a commonly used step-down circuit at present. This circuit includes an energy storage element inductor L1. The first side of the inductor L1 is coupled to the switching circuit, and the other side is coupled to the parallel filter electrolytic capacitor and the load circuit. The switching circuit The conversion will lead to ripple voltage at the load end. When working, the output voltage of the power supply fluctuates greatly. To reduce this voltage fluctuation, it is necessary to increase the filter electrolytic capacitor. The larger the capacitance value of the electrolytic capacitor, the higher the output voltage. The smaller the fluctuation, the smoother the output voltage. However, the lifetime of the electrolytic capacitor is much shorter than that of the ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/14G01R31/40G01R19/04
CPCG01R19/04G01R31/40H02M1/14
Inventor 陈李胜何志红
Owner 深圳新视光电科技有限公司
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