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Soft start circuit

A technology of soft start circuit and isolated drive circuit, which is applied in the direction of electrical components, output power conversion devices, etc., can solve problems such as inconvenient control, grid harmonic current impact, secondary current impact, etc., to solve the problem of drive power supply, Effects with low additional cost and easy realization

Inactive Publication Date: 2012-08-01
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
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Problems solved by technology

The problem with the first two methods is: the secondary current impact problem is brought about when the resistance is cut off
The problem with the latter method is that it is only suitable for applications where the load power is less than 200W
[0004] After searching the existing technology, it was found that Zhang Xiangjun et al., "Journal of Electrical Machinery and Control". June 2011. Summarized two traditional soft-start circuits, and proposed "a startup surge current suppression circuit", that is, a three-stage shock Current suppression circuit, this circuit can effectively suppress the primary surge current and secondary surge current when starting, but there is still surge current, the harmonic current impact on the power grid is relatively serious, and the structure is complex, the number of components is large, and the control is not easy

Method used

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Embodiment 1

[0015] Such as figure 1 As shown, this embodiment includes: a rectifier 1, an impedance transformation circuit 2 and a controller 3, wherein: the output end of the rectifier 1 is connected to the input end of the impedance transformation circuit 2, and the output end of the impedance transformation circuit 2 is connected to the controller 3, The output terminal of the controller 3 is connected with the control terminal of the impedance transformation circuit 2 .

[0016] In this embodiment, the rectifier 1 includes: a rectifier bridge BR1 and an input filter capacitor C1, wherein the two input terminals of the rectifier bridge BR1 are respectively connected to the L terminal and the N terminal of the single-phase AC power supply, and the input filter capacitor C1 is bridged to At the input terminal of the rectifier bridge BR1, the positive pole of the output terminal of the rectifier bridge BR1 is connected to the positive pole of the input terminal of the impedance conversion...

Embodiment 2

[0027] Such as figure 2 As shown, this embodiment relates to a simplified soft start circuit, and the difference from the circuit schematic diagram of Embodiment 1 is that the power diode D1 in the impedance conversion circuit 2 is removed.

[0028] In this embodiment, the impedance conversion circuit 2 includes: a boost inductor L1, a first reverse conduction switch S1, a second reverse conduction switch S2, a fast recovery diode FRD1, an energy storage capacitor E1, a start-up current limiting resistor R1, a second A voltage-dividing resistor R2 and a second voltage-dividing resistor R3, wherein: the output anode of the rectifier 1 is connected to one end of the boost inductor L1, and the other end of the boost inductor L1 is respectively connected to the anode of the fast recovery diode FRD1 and the first reverse conduction switch The input terminal of S1 is connected, the anode of the energy storage capacitor E1 is respectively connected with the cathode of the fast recov...

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Abstract

The invention discloses a soft start circuit belonging to the technical field of power electronic conversion. The soft start circuit comprises a rectifier, an impedance conversion circuit and a controller, wherein the rectifier comprises a rectifier bridge and an input filter capacitor; the input terminal of the rectifier bridge is respectively connected with the live wire and middle wire of a single-phase AC power supply; the input filter capacitor is bridged with the input terminal of the rectifier bridge; the output DC positive pole of the rectifier bridge and the input terminal positive pole of the impedance conversion circuit are connected to form the positive pole output terminal of the rectifier; and the output DC negative pole of the rectifier bridge and the input terminal negative pole of the impedance conversion circuit are connected to form the negative pole output terminal of the rectifier. The soft start circuit has the advantages of simple structure, low additional cost, adjustable pickup current, easiness in realization, and the like; a switch tube has common-ground and common-source advantages, and the problem of a drive power supply of the switch tube is solved.

Description

technical field [0001] The invention relates to a circuit in the technical field of power electronic converters, in particular to a soft start circuit. Background technique [0002] Power electronic conversion devices can be used in switching power supplies, high-power power supplies and other applications, and their reliable operation is very important in practical applications. The startup process has a great impact on the safe operation and reliability of the device. In the traditional start-up method, the input power directly charges the output capacitor through the inductance, the charging circuit resistance is small, and the inrush current is large, which will cause unfavorable conditions: the inrush current on the grid side is too large, causing harmonic current pollution in the grid; large inrush current It requires a higher withstand voltage value of the output capacitor, which poses a threat to its safe operation. Considering the harm of inrush current, it is nece...

Claims

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Application Information

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IPC IPC(8): H02M1/36
Inventor 李华武马红星杨喜军
Owner SHANGHAI JIAO TONG UNIV
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