Ripple current generation method and circuit

A ripple current and generation method technology, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve the problems of inconvenient use, large space, complicated wiring, etc., and achieve simple wiring, low cost, and versatility. strong effect

Active Publication Date: 2016-01-13
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when testing or aging, for example, at 311V DC, the ripple current reaches the rated ripple current of 1200mA, then the power consumption of the switching power supply will reach 311V×1.2A=373.2W. The cost of such a power supply itself is not low. If The output is 48V, and the efficiency is 90%. The current practice in the industry is to convert the 48V into 220VAC and return to the mains, but the efficiency is about 90%, and the overall efficiency is about 81%. The wiring is complicated and it is very inconvenient to use.
In order to shorten the test time, it is generally tested under high temperature condition

Method used

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  • Ripple current generation method and circuit
  • Ripple current generation method and circuit

Examples

Experimental program
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Effect test

no. 1 example

[0055] see figure 2 , a method for generating ripple current, which adopts method 1 in the technical solution, so I won’t go into details here, but explain here that the field effect tube is connected in series with the first winding of the transformer: the field effect tube is connected in series with the winding, according to the industry tradition, the field The effect tube is used as a controllable switch. Its gate is a control terminal and does not participate in series connection. Its drain and source participate in series connection.

[0056] A ripple current generation circuit, comprising a DC power supply U, an inductor L, a transformer T, a diode D, a field effect transistor Q, which is an N-channel type MOS transistor, a pulse width modulation control circuit P, and connected by The output terminals of the two pins for measuring capacitance include a positive terminal J+ and a negative terminal J-, the transformer T includes a first winding 1 and a second winding 2...

no. 2 example

[0097] see image 3 , a method for generating ripple current, which adopts method two in the technical solution, and will not be repeated here. A ripple current generating circuit includes a DC power supply U, a capacitor C, an inductor L, a transformer T, and a diode D, a field effect transistor Q, is an N-channel MOS transistor, a pulse width modulation control circuit P, and an output terminal connected to two pins of the measured capacitor, including a positive terminal J+ and a negative terminal J-, the transformer T includes the first winding 1 and the second winding 2, the first winding 1 and the second winding 2 are bifilar windings, and the transformer T has a magnetic core with an air gap, and the output of the DC power supply U has a positive pole and the negative pole, the connection relationship is:

[0098] The positive terminal J+ of the output terminal of the measured capacitor is connected to one end of the inductor, the negative terminal J- of the output ter...

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Abstract

A ripple current generation method adopts a direct current power supply U, an inductor L, a transformer T with two windings wound in a bifilar mode, a diode D, a field effect tube Q, a pulse width modulation control circuit P and a tested capacitor, wherein the transformer T is provided with a magnetic core with an adjustable air gap, and the tested capacitor and the inductor L are connected in series and then are in parallel connection with the power supply. The field effect tube Q and the winding 1 of the transformer T are connected in series and then are in parallel connection with the tested capacitor. The winding 2 of the transformer T and the diode D are connected in series and then are in parallel connection with the tested capacitor. The control circuit P drives the field effect tube Q to work in an on-off state, and the biggest duty ratio is smaller than 0.5. When the Q is turned on, the winding 1 is excited to produce discharge current, and when the Q is turned off, the winding 1 carries follow current and performs demagnetization to produce charging current, and energy is recovered. Therefore, ripple current of the tested capacitor is obtained, and a ripple current generation circuit has the advantages of being low in cost, low in energy consumption, simple in wiring and small in size.

Description

technical field [0001] The invention relates to the generation of high-frequency ripple current, in particular to the generation of high-frequency ripple current for testing electrolytic capacitors. Background technique [0002] At present, there are many applications of switching power supplies. For occasions where the input power is below 75W and the power factor (PF, PowerFactor, also known as power factor) is not required, the flyback (Fly-back) switching power supply has attractive advantages: the circuit topology is simple , wide input voltage range. Flyback switching power supply has a relatively high reliability of the circuit due to fewer components, so it is widely used. For convenience, many documents are referred to as flyback switching power supply. Common topologies such as figure 1 As shown, the prototype of the figure comes from page 60 of "Switching Power Converter Topology and Design" written by Dr. Zhang Xingzhu with ISBN978-7-5083-9015-4, which is refer...

Claims

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Application Information

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IPC IPC(8): G05F1/56
Inventor 王保均
Owner MORNSUN GUANGZHOU SCI & TECH
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