Surge current suppression circuit of converter and operation method thereof
A surge current and suppression circuit technology, applied in the direction of output power conversion devices, electrical components, etc., can solve the problems of power loss of power products and the reduction of the effect of suppressing surge current, so as to reduce power loss, reduce power loss, suppress power loss, etc. Effects of inrush current
Inactive Publication Date: 2013-04-03
DARFON ELECTRONICS (SUZHOU) CO LTD +1
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Problems solved by technology
However, thermistors cause additional power loss in power supply products
In addition, the thermistor that suppresses the inrush current will reduce the resistance value of the thermistor after the power supply product is turned on due to the increase in the ambient temperature of the power supply product, resulting in a reduction in the effect of the thermistor in suppressing the inrush current when the power supply product is hot started.
Therefore, prior art is not a good choice for designers of power supply products
Method used
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[0035] In order to have a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed descriptions are provided in conjunction with the embodiments.
[0036] Please refer to figure 1 As shown, it is a schematic circuit diagram of a surge current suppression circuit 100 of a converter of the present invention, and the converter is applied to convert AC voltage to DC voltage. The surge current suppression circuit 100 includes a resistor 102 , a bypass unit 104 , an inductance transformer 106 and a control signal generator 108 . Such as figure 1 As shown, the resistor 102 is used to couple to the bridge rectifier 110 of the converter to reduce the inrush current (IR) after the converter is turned on, wherein the resistor 102 can be a thermistor (thermistor), and it has a positive temperature coefficient or negative temperature coefficient. In addition, in another embodiment of the present invention, the resistor 102...
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The invention provides a surge current suppression circuit of a converter and an operation method thereof, and particularly relates to the surge current suppression circuit which not only can suppress surge current but also can reduce power loss of the converter and an operation method thereof. The converter is applied to converting alternating-current voltage into direct-current voltage. With the adoption of the surge current suppression circuit of the converter and the operation method thereof provided by the invention, after the converter is turned on, input current from a bridge rectifier passes through a resistor and other circuits inside the converter. At present, a bypass unit is an opened state, and the resistor can restrain the surge current after the converter is turned on. Afterwards, when voltage of a center tap of an induction transformer enables a control signal generator to generate a control signal, the bypass unit is turned on according to the control signal. Therefore, compared with the prior art, the surge current suppression circuit provided by the invention not only can suppress the surge current, but also can reduce the power consumption of the converter.
Description
technical field [0001] The present invention relates to a surge current suppressing circuit of a converter and its operating method, especially to a surge current suppressing circuit and its operating method which can not only suppress the surge current but also reduce the power loss of the converter. Wherein the converter is applied to convert AC voltage to DC voltage. Background technique [0002] Generally speaking, an AC voltage-to-DC power supply product will add an electrolytic capacitor after the bridge rectifier to filter the AC power into DC power. Before the AC power supply is connected to the power supply product, the voltage on the electrolytic capacitor is zero. Because the input AC voltage is different from the voltage on the electrolytic capacitor when the power supply product is turned on, the power supply product will generate inrush current according to formula (1), or called inrush current (Inrush Current), where the inrush current It may cause damage to ...
Claims
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IPC IPC(8): H02M1/14
Inventor 周葭军
Owner DARFON ELECTRONICS (SUZHOU) CO LTD