Low-power-consumption redundant current sharing circuit based on PMOS

A low-power, redundant technology, applied in emergency protection circuit devices, circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve problems such as high power supply requirements

CN111478570AActive Publication Date: 2020-07-31TIANSHENGQIAO BUREAU CSG EHV POWER TRANSMISSION CO
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-07-31

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Abstract

The invention discloses a low-power-consumption redundant current sharing circuit based on a PMOS. The invention belongs to the technical field of power electronics. The PMOS-based low-power consumption redundant current sharing circuit can be applied to a load side; current sharing of two power supplies is not required; the requirement on the consistency of the output voltages of the two power supplies is relatively low; according to the circuit, a PMOS is used for applying negative voltage to a gate electrode; the low-resistance on-state characteristic between the drain electrode and the source electrode is realized; and the impedance between the drain electrode and the source electrode is controlled by the gate voltage amplitude. Measures such as a sampling resistor and an operational amplifier are combined; the input impedance of the two power supplies is automatically adjusted; current sharing of the two power supplies is realized; when the local heat of the circuit is too high inthe using process, the insulating liquid is pushed out and sprayed on the outer side of the gasket under the dispersion action of the release holes, and a layer of insulating liquid film is formed between the inner walls of the contact end holes under the action of the capillary fiber thorns, so that the whole circuit is insulated when the local temperature is too high.
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Description

technical field

[0001] The invention relates to the technical field of power electronics, in particular to a PMOS-based low power consumption redundant current sharing circuit. Background technique

[0002] Circuit: A conductive circuit composed of metal wires and electrical and electronic components is called a circuit. Adding a power supply to the input end of the circuit causes a potential difference at the input end, and the circuit can work when it is connected. The existence of current can be tested by some instruments, such as voltmeter or ammeter deflection, light bulb lighting, etc.; according to the nature of the current flowing, it is generally divided into two types: the circuit through which direct current passes is called "DC circuit", and the circuit through which alternating current passes The circuit is called an "AC circuit".

[0003] The bridge arm of the MMC flexible direct current transmission converter valve is composed of many power units in series. ...

Examples

Embodiment 1

[0037] see Figure 1-2 , a PMOS-based low-power redundant current sharing circuit, including Vin1 and Vin2, the positive terminal of Vin1 is respectively connected to the drain of the first current sharing MOS1, the cathode of the first Zener diode 2 and the first drive optocoupler 8 The collector of the secondary side, the positive terminal of Vin2 are respectively connected to the drain of the second current sharing MOS3, the cathode of the second Zener diode 4 and the secondary collector of the second driving optocoupler 9, and the gate of the first current sharing MOS1 They are respectively connected to the anode of the first zener diode 2, the emitter of the secondary side of the first drive optocoupler 8 and the upper end of the second drive resistor 6, and the gate of the second current sharing MOS3 is respectively connected to the anode of the second zener diode 4 1. The secondary emitter of the second drive optocoupler 9 is connected to the upper end of the first driv...