Zero current detection circuit for series resonance charging source and design method thereof

A technology of zero current detection and charging power supply, which is applied in the direction of power supply testing, measuring current/voltage, measuring devices, etc., can solve problems such as neglect, achieve the effects of eliminating delay effects, eliminating electromagnetic radiation pollution, and improving efficiency

Inactive Publication Date: 2011-04-20
INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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[0004] In this way, the problems that arise: one is igno

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  • Zero current detection circuit for series resonance charging source and design method thereof
  • Zero current detection circuit for series resonance charging source and design method thereof
  • Zero current detection circuit for series resonance charging source and design method thereof

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[0024] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

[0025] Principle analysis: In the field of pulsed power technology, high-voltage capacitors are commonly used as energy storage devices, and a DC constant current power supply with high output impedance is generally required to charge the capacitors. The efficiency of an ordinary linear charging power supply is about 60%. In order to achieve high efficiency, almost all modern high-voltage capacitor charging power supplies adopt high-frequency switching converter designs, and the efficiency is raised above 80%.

[0026] The high-frequency switching converter uses a series of pulses or pulse chain...

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Abstract

The invention relates to a detection circuit for charging source working state and a design method thereof, particularly to a zero current detection circuit for a series resonance charging source and the design method thereof. The invention solves the problem of the prior art that the converter switch nonzero turn-off is caused by the capacitor charging source resonant frequency drift designed based on series resonance switch convertor technique. The invention provides a detection circuit guiding a series resonance convertor type capacitor charging source convertor switch to keep working under the condition of zero current. The technical scheme is that a resonance voltage signal is generated by rectifying a resonance current signal and bias adjusting direct current, an amplitude-adjustable threshold voltage is generated by rectifying a convertor switch signal of the charging source, and the resonance voltage signal and a switch voltage signal are sent to a comparator so as to treat correspondingly according to a comparison result. The invention is mainly applied to the situation at zero current switch state in the design process of a series resonance convertor type capacitor charging source.

Description

Technical field [0001] The invention relates to a detection circuit and a design method for the working state of a charging power supply, in particular to a detection circuit and a design method for the zero current state of a series resonance charging power supply. Background technique [0002] The high-voltage capacitor charging power supply is designed based on high-frequency converter technology, and the topology of the converter is a series resonant switching converter structure. The characteristic of this topology is that the converter switch operates when the resonant current is zero, and the on-time of the converter switch and the resonant frequency are fixed values, and there is a certain relationship. The switch is turned off when the resonant current returns to zero for the first time every time the resonant current occurs, which is the so-called zero-current switching (soft switching), which avoids the so-called hard switching phenomenon that occurs when the switch is...

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Application Information

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IPC IPC(8): G01R31/40G01R19/175
Inventor 任青毅李晏敏黄斌贾兴邓明海丁明军叶超代刚马成刚龙燕曹宁翔冯宗明赵娟李玺钦于治国梁川马勋马军邓维军李亚维黄雷吴红光冯莉李巨王浩王卫张振涛谢敏曹科峰
Owner INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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