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A ripple current generates circuit

A technology for generating circuits and ripple currents, applied in the direction of adjusting electrical variables, instruments, control/regulation systems, etc., can solve problems such as large charging switch losses and changes in power supply voltage

Active Publication Date: 2021-05-18
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] To sum up, for the low-frequency pulsating charging current of electrolytic capacitors, the existing charging schemes have the problems of large charging switching loss, and the power supply voltage needs to be changed with the adjustment of the test current.

Method used

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Embodiment 1

[0039] The circuit principle diagram of the first embodiment of the present invention is as Figure 8 As shown, it includes switch circuit K2, inductor L1, capacitor C1 and input power Vin, and R1 is the load of aged capacitor C1. The switch circuit K2, the inductor L1 and the capacitor C1 form a series circuit, and the series positions of the switch circuit K2, the inductor L1 and the capacitor C1 can be interchanged without affecting the working principle of the series circuit and the beneficial effects of the present invention. The two ends of the series circuit are connected to the two ends of the input power Vin, and the load is connected to the two ends of C1. In this embodiment, one end of K2 is used as one end of the series circuit, the other end of K2 is connected to one end of L1, the other end of L1 is connected to one end of C1, and the other end of C1 is used as the other end of the series circuit.

[0040] The basic working process is: when the switch circuit K2...

Embodiment 2

[0046] The second embodiment of the present invention is such as Figure 10 As shown, this embodiment is an improvement made on the basis of the first embodiment. A unidirectional conduction circuit is added to the series circuit. The unidirectional conduction circuit can be connected between any two components in the switch circuit K2, the inductor L1 and the capacitor C1. The positive flows to the input power Vin negative, preventing the current from flowing from the input power Vin negative to the input power Vin positive. In this embodiment, one of the series connection modes of the series circuit is selected, and the unidirectional conduction circuit is connected between L1 and C1. Other series connection methods of the series circuit, and the connection of the unidirectional conduction circuit between any other two components, all have the same working principle as this embodiment, and can achieve the same technical effect.

[0047] In this embodiment, the unidirection...

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Abstract

The invention provides a ripple current generating circuit, which can reduce the loss of a charging switch while realizing discharge energy recovery of an electrolytic capacitor and charging with a low-frequency pulsating current, and realize that the average aging voltage of the electrolytic capacitor follows the input voltage without being affected by the discharge current. Including an input voltage, a switching circuit, an inductor, and a capacitor; the switching circuit, the inductor and the capacitor are connected in series to form a series circuit, and the two ends of the series circuit are connected to the two ends of the input power supply Vin; the resonance period of the inductor and the capacitor is at Between four-thirds and four times the turn-on time of the switching circuit. When the power supply Vin charges the capacitor, it does not need to provide a voltage higher than the voltage required for capacitor aging, and charging without switching loss can be achieved.

Description

technical field [0001] The invention relates to a ripple current generating circuit, in particular to a generating circuit for testing low-frequency charging ripple current of an electrolytic capacitor. Background technique [0002] At present, in the electronic system power supply system, switching power supply is widely used. For occasions where the input power is below 75W and the power factor (PF, Power Factor, also known as power factor) is not required, the flyback switching power supply is reliable due to its simple circuit topology, wide input voltage range, and fewer components. Relatively high performance, has a wide range of applications. Flyback switching power supply is referred to as flyback switching power supply, the common topology is as figure 1 shown. The prototype of this figure comes from page 60 of "Switching Power Converter Topology and Design" written by Dr. Zhang Xingzhu with ISBN978-7-5083-9015-4. It consists of a rectifier bridge 101, a filter ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 贾宇锋蔡嘉齐聂燊
Owner MORNSUN GUANGZHOU SCI & TECH