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Simple soft start circuit

A soft-start circuit and drive circuit technology, applied in electrical components, output power conversion devices, etc., to achieve the effects of small voltage drop, high power efficiency, and low temperature

Inactive Publication Date: 2019-07-05
浙江雷培德科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problem of transient current when the power supply is turned on, the present invention proposes a new idea based on the existing series NTC technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] like figure 2 As shown, the soft start circuit includes a rectifier circuit, a DC / DC or DC / AC conversion circuit connected to the load, an inductor L1, a capacitor C1, and two switch tubes Q1 and Q2; the inductor L1 is connected to one end of the rectifier circuit, and the first The two ends of the switch tube Q1 are connected in parallel to the rectifier circuit and the two ends of the inductance L1, and the capacitor C1 is connected in parallel to the two ends of the conversion circuit;

[0048] A diode D5 is set between the inductance L1 and the capacitor C1; a second switch tube Q2 is set between the connection midpoint of the rectifier circuit and the conversion circuit and the capacitor C1, and the gates of the first switch tube Q1 and the second switch tube Q2 are simultaneously Connected to the drive circuit, the drive circuit is connected to the control circuit.

[0049] In this example, the current flowing through the second switching tube Q2 is the same as ...

Embodiment 2

[0051] like image 3 As shown, the soft start circuit includes a rectifier circuit, a DC / DC or DC / AC conversion circuit connected to the load, an inductor L1, a capacitor C1, and two switch tubes Q1 and Q2; the inductor L1 is connected to one end of the rectifier circuit, and the first The two ends of the switch tube Q1 are connected in parallel to the rectifier circuit and the two ends of the inductance L1, and the capacitor C1 is connected in parallel to the two ends of the conversion circuit;

[0052] A diode D5 is provided between the inductor L1 and the capacitor C1; the two ends of the second switching tube Q2 are respectively connected to the rectifier circuit and the conversion circuit and are on different sides from the inductor L1, and the gates of the first switching tube Q1 and the second switching tube Q2 are connected simultaneously. To the drive circuit, the drive circuit is connected to the control circuit;

[0053] In this embodiment, the current flowing thro...

Embodiment 3

[0055] like Figure 4 As shown, the soft start circuit includes a rectifier circuit, a DC / DC or DC / AC conversion circuit connected to the load, an inductor L1, a capacitor C1, and two switch tubes Q1 and Q2; the inductor L1 is connected to one end of the rectifier circuit, and the first The two ends of the switch tube Q1 are connected in parallel to the rectifier circuit and the two ends of the inductance L1, and the capacitor C1 is connected in parallel to the two ends of the conversion circuit;

[0056] A second switching tube Q2 is provided between the inductor L1 and the capacitor C1; the gates of the first switching tube Q1 and the second switching tube Q2 are simultaneously connected to the driving circuit, and the driving circuit is connected to the control circuit;

[0057] In this embodiment, the flow through the second switch tube Q2 is the same as in embodiment 2, but compared with embodiments 1 and 2, there is one less diode, that is, the second switch tube Q2 is u...

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Abstract

The invention relates to a circuit structure, and aims to provide a simple soft start circuit. The circuit comprises a rectifying circuit, a DC / AC conversion circuit, an inductor L1, an energy storagecapacitor C1 and two switch tubes Q1 and Q2, wherein the inductor L1 is connected to one end of the rectifying circuit; the two ends of the first switch tube Q1 are connected in parallel to the two ends of the rectifying circuit and the inductor L1; and the energy storage capacitor C1 is connected in parallel to the two ends of the conversion circuit. When the switch tubes are conducted, the voltage drop is small, the temperature is low, the power supply efficiency is higher than that of a series NTC thermistor, and surrounding elements are not heated. The problem that an NTC cannot inhibit atransient impact current at a high temperature can be avoided. The simple soft start circuit can be used for low-power circuits and high-power supplies of a few kilowatt to hundreds of kilowatt. Thesimple soft start circuit is suitable for circuits with input active power factor adjustment functions, and circuits with input passive power factor adjustment functions or without PFCs, including a switch power supply, an LED driver, a fluorescent lamp ballast, an HID ballast and the like.

Description

technical field [0001] The invention relates to a circuit structure, in particular to a simple soft start circuit. Background technique [0002] Due to the existence of capacitance in the circuit, a sudden application of voltage will generate a large transient current. Therefore, when the power is turned on, a certain resistance is connected in series first, and the resistance is short-circuited after a delay. This process limits the transient current when starting up. , and such a circuit is called a soft-start circuit. Soft-start circuits are widely used, such as switching power supplies, LED drivers, fluorescent lamp ballasts, HID ballasts, etc. [0003] The existing common soft-start circuit structure is usually as follows figure 1 As shown, usually an NTC thermistor is connected in series in the circuit from the input power supply to the energy storage capacitor C1. The NTC thermistor has a large resistance when the temperature is low, generally 1-10 ohms. Due to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36
CPCH02M1/36
Inventor 毛智伟
Owner 浙江雷培德科技有限公司
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