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Overcurrent protection circuit of inverter power supply

An overcurrent protection circuit, inverter power supply technology, applied in emergency protection circuit devices, conversion of AC power input to DC power output, electrical components, etc. Slow and other problems, to achieve the effect of reasonable circuit design, good promotion and application value, and reduced power consumption

Pending Publication Date: 2020-08-04
郑州时享电子技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing over-current and short-circuit protection schemes have complex structure, slow action, and poor protection reliability

Method used

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  • Overcurrent protection circuit of inverter power supply
  • Overcurrent protection circuit of inverter power supply

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] see figure 1 , the inverter power supply overcurrent protection circuit of the present invention includes a detection sampling circuit and a comparison processing circuit. The detection sampling circuit is respectively connected to the source terminals U3VS and U4VS of the two output switch tubes (not shown in the figure of the output switch tube), and the drive circuit The two drive pulse outputs are respectively connected to two push-pull amplifiers through a current-limiting resistor and a clamping diode, and the output terminals U3LO and U4LO of the two push-pull amplifiers are respectively connected to the control pole of the output switch tube through a current-limiting resistor. The base of the comparator Q10 of the comparison circuit is connected to the voltage regulator tube D19 of the sampling circuit through a clamping resistor, and the collector of the comparator is connected to the connection node of the clamping diodes of the two push-pull amplifiers, and t...

Embodiment 2

[0020] see figure 1 The inverter power supply overcurrent protection circuit of this embodiment is different from Embodiment 1 in that further, the sampling circuit is composed of a switching diode D13 connected to the output switching tube I, a resistor R54, a diode D17, and a switching diode connected to the output switching tube II The switching diode D9, the resistor R53, and the diode D15 are formed and connected to the Zener diode D19, and then grounded through the filter capacitor, and the negative end of the Zener tube D19 is connected to the base of the comparator Q10 of the comparison circuit through the resistor R59; One path of the driving pulse is connected to the connection node of the resistor R54 and the diode D17 in the sampling circuit through the resistor R56, and one path is connected to the connection node of the resistor R53 and the diode D15 in the sampling circuit through the resistor R55.

[0021] Action process of overcurrent protection:

[0022] Whe...

Embodiment 3

[0026] see figure 1 , figure 2 The inverter power supply overcurrent protection circuit of this embodiment is different from Embodiment 2 in that further, the collector output of the comparator Q10 of the comparison circuit is connected to two isolation diodes D18, D16 and a photocoupler , the output SD end of the optocoupler is connected to the driving pulse generating circuit.

[0027] When an overcurrent (short circuit, overload) condition occurs, the control signal turns off the push-pull output through the diodes D16 and D18, and at the same time outputs the signal SD through the optocoupler U6 to stop the previous driving pulse generation circuit.

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Abstract

The invention relates to an inverter power supply protection circuit. The invention discloses the overcurrent protection circuit of an inverter power supply. The circuit comprises a detection samplingcircuit and a comparison processing circuit. The circuit is characterized in that the detection sampling circuit is connected with source terminals of two output switch tubes; two paths of driving pulse output of a driving circuit are respectively connected with two push-pull amplifiers through a current-limiting resistor and a clamping diode; the output ends of the two push-pull amplifiers are respectively connected with the control electrodes of the output switch tubes through a current-limiting resistor; the base electrode of the comparator of the comparison circuit is connected with a voltage stabilizing tube of the sampling circuit through a clamping resistor; the collector electrode of the comparator is connected with a connection node of the clamping diodes of the two push-pull amplifiers; and the node is connected with a working power supply through a pull-up resistor. The overcurrent protection circuit of the inverter power supply is unique in protection mode, rapid and reliable in protection and recovery, convenient to use and stable and reliable in performance.

Description

technical field [0001] The invention relates to an inverter power supply protection circuit, in particular to an inverter power supply overcurrent / short circuit protection circuit. Background technique [0002] Because of its convenience and portability, inverter power supply is widely used in various industries and fields. But it is precisely because the use environment of the inverter power supply is mostly a place with a complex external environment, so its stability and safety directly determine its performance and convenience. Moreover, depending on the working environment and the object of use, there is also a strong uncertainty in the impact of the failure of the equipment itself during use. Regardless of various power tools and equipment, there will be more or less overcurrent / short circuit faults during use, and serious equipment damage will occur. Therefore, it is necessary to carry out safety performance testing and adopt over-current and short-circuit protectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/00H02M1/32H02H7/12H02H7/122
CPCH02M7/003H02M1/32H02H7/12H02H7/1227
Inventor 刘明周乐生王留军赵明寅
Owner 郑州时享电子技术有限公司