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Surging suppression circuit

A surge suppression circuit and resistor technology, applied in circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve problems such as value dilemmas and poor compatibility, and achieve Effects of reducing power loss, suppressing injection, and real-time current limiting protection

Active Publication Date: 2013-09-25
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] 2. The value of R1 often presents a dilemma
[0019] 3. The power margin of R1 should be sufficient. Due to the size limitation, many occasions with strict volume requirements are not compatible.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0035] like figure 2 As shown, a surge suppression circuit includes a positive input terminal Vin+, a negative input terminal Vin-, a positive output terminal Vout+, a negative output terminal Vout-, a MOS transistor Q1, a second transistor Q2, a third transistor Q3, a capacitor C, The first resistor R1, the second resistor R2 and the third resistor R3, the positive input terminal Vin+ is connected to the positive output terminal Vout+, and the positive input terminal Vin+ passes through the third resistor R3 and respectively connects with the gate of the MOS transistor Q1 and the collector of the third transistor Q3 The electrodes are connected, the positive input terminal Vin+ is connected to the drain of the field effect transistor Q1 through the capacitor C, the drain of the MOS transistor Q1 is also connected to the negative output terminal Vout-, the negative input terminal Vin- is connected to the source of the MOS transistor Q1 through the first resistor R1 The base of ...

Embodiment 2

[0050] like image 3 As shown, the difference from the first embodiment is that the second transistor Q2 and the third transistor Q3 are PNP transistors, and the MOS transistor Q1 is a P-channel power MOS transistor. The polarity of the power supply must be reversed, and other connection relationships remain unchanged. , If the capacitor uses polarized capacitors such as electrolytic capacitors, it can be connected correctly according to the actual polarity when connecting.

[0051] Its working principle is the same as that described in Embodiment 1, and will not be repeated here. The second embodiment is suitable for controlling a circuit with a positive power input, and a circuit where the input terminal and the output terminal need to share the ground.

[0052] In addition, the above two embodiments can be further improved. For example, connecting resistors in parallel between the base and emitter of the second transistor Q2 and the third transistor Q3 can adjust the satur...

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Abstract

The invention discloses a surging suppression circuit comprising a positive input end and a negative input end of an input power supply, a positive output end and a negative output end of an output power supply, a field-effect transistor, a second transistor, a third transistor, a capacitor, a first resistor, a second resistor and a third resistor, wherein the positive input end is connected withthe positive output end; the positive input end is connected with the grid electrode of the field-effect transistor and the collector electrode of the third transistor by virtue of the third resistor; the positive input end is connected with a drain electrode of the field-effect transistor by virtue of the capacitor; the drain electrode of the field-effect transistor is connected with the negative output end; the negative input end is connected with the source electrode of the field-effect transistor by virtue of the first resistor; the base electrode of the third transistor is connected withthe source electrode of the field-effect transistor; the base electrode of the second transistor is connected with the negative output end by virtue of the second resistor; the emitting electrode of the third transistor is connected with the collector electrode of the second transistor; and the emitting electrode of the second transistor is connected with the negative input end. The surging suppression circuit can be used for restraining surge voltage or current injection actually and effectively when a machine is started on.

Description

technical field [0001] The invention relates to a power supply protection circuit, in particular to a surge suppression circuit in a capacitance filter circuit. Background technique [0002] There are a large number of rectification circuits in various electrical appliances at present. For example, the commercial power is rectified and capacitor filtered, and then supplies power to the conversion circuit of the switching power supply; another example is the traditional power supply. After the commercial power is stepped down by the transformer, it is rectified and capacitor filtered. Other circuits supply power. When the power switch of this kind of electrical appliances is turned on, due to the existence of the filter capacitor, the voltage across the filter capacitor is instantly charged from 0V to the rated working voltage, which will generate a large surge voltage and surge current. It not only shortens the life of the filter capacitor, but also has a greater impact on t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/02H02H9/04H02M1/32
Inventor 王保均
Owner MORNSUN GUANGZHOU SCI & TECH
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