Rapid short circuit protection circuit of frequency converter direct current bus and apparatus thereof
A short-circuit protection circuit, DC bus technology, applied in emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc., can solve the problem of high maintenance costs, achieve low production costs, reduced maintenance costs, and high reliability. Effect
Active Publication Date: 2016-12-21
SHISHI KURUI ELECTRICAL
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Problems solved by technology
The existing short-circuit protection circuit of the inverter protects the IGBT by integrating the intelligent drive optocoupler and Hall detection, but for enterprises, the maintenance cost of using these two components is too high, which requires a short-circuit protection response Fast time, lower cost protection circuit
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[0017] The present invention will be further described below through specific embodiments.
[0018] Such as figure 1 and figure 2 As shown, the short circuit protection circuit of the inverter DC bus includes two 10 milliohm resistors R11 and R12, resistors R2, R3, R4, R5, R8, current limiting resistors R71, R72, R73, PNP transistor Q1, PNP transistor Q2 , NPN transistor Q3, zener diodes ZD1, ZD2, photocoupler PC1, capacitors C1, C2, C3; the photocoupler PC1 includes light emitting diode D1 and phototransistor Q4, and the positive pole P of the converter rectifier circuit is connected in series with milliohms Resistors R1 to P2, the anode P is connected to the cathode of the Zener diode ZD1, the anode of the polar capacitor C1 and the anode of the light-emitting diode, the cathode of the polar capacitor C1 is connected to the anode of ZD1, the emitter of the transistor Q1 is connected to P2, and the transistor Q1 The base and collector of the transistor Q2 are connected to ...
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The invention relates to the electrical equipment protection circuit and especially relates to a rapid short circuit protection circuit of a frequency converter direct current bus. The circuit comprises more than one milliohm resistors R1, resistors R2, R3, R4, R5 and R6, more than one current-limiting resistors R7, a PNP triode Q1, a PNP triode Q2, an NPN triode Q3, voltage stabilizing diodes ZD1 and ZD2, a photoelectric coupler PC1 and capacitors C1, C2 and C3. The photoelectric coupler PC1 comprises a light emitting diode D1 and a photosensitive triode Q4. When an external portion of a frequency converter generates a short circuit or a current of the direct current bus is too large, the rapid short circuit protection circuit of the frequency converter direct current bus can carry out response in a very short period of time; output of an IGBT driving circuit is turned off so that an IGBT is prevented from being burnt out because of the short circuit; and software detection is not needed, reliability is high, product production cost is low and maintenance cost of an enterprise is greatly reduced.
Description
[0001] This application is a divisional application of "Short Circuit Protection Circuit for Inverter DC Bus". The filing date of the original application is August 7, 2014, and the application number is: 201410385558.6. technical field [0002] The invention relates to a protection circuit for electrical equipment, in particular to a short-circuit protection circuit for a DC bus of a frequency converter. Background technique [0003] In the daily motor control process, the frequency converter plays an important role. During the use of the motor, due to human wiring errors, severe aging of the motor, winding insulation damage, and electromagnetic interference of the control signal, it is easy to cause a short-circuit fault at the output of the inverter. The instantaneous current of the short-circuit is very large, exceeding the normal operating current range of the IGBT tube. If the PWM output of the inverter cannot be turned off in time and effectively within the specified ...
Claims
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IPC IPC(8): H02H3/087
CPCH02H3/087
Inventor 吴庆瑞
Owner SHISHI KURUI ELECTRICAL