Inversion protection circuit
A protection circuit and inverter technology, which is applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of power switch device explosion and easy software failure, etc., and achieve the effect of simple operation, simple structure and low cost
Active Publication Date: 2011-06-01
O&C ELECTRIC TECHN CO LTD
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Problems solved by technology
The working principle of the traditional inverter circuit (inverter) is to control the opening and closing of the IGBT through software, but the disadvantage of this method is that software failures are prone to occur, causing the power switching device to pass through and cause the machine to explode.
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[0009] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0010] like figure 1 and figure 2 As shown, the inverter protection circuit of the present invention includes three sets of delay interlock units respectively corresponding to the three-phase inverter AC voltage, and each set of delay interlock units corresponds to one phase of the inverter AC voltage. Each group of delay interlock units includes a pair of delay interlock circuits. The input terminals of the delay interlock circuits are connected to the drive PWM signals of the upper and lower tubes connected in series on the same phase, and the output terminals are respectively connected to two series connected on the same phase. connected to the IGBT input. The delay interlock circuit includes two PWM signal input units, an NPN transistor and a delay unit. The two PWM signal input units are respectively connected to the PWM signa...
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The invention provides an inversion protection circuit. The circuit comprises three groups of delayed interlocking units corresponding to three phases of inversion AC voltages, wherein each delayed interlocking unit corresponds to one phase of inversion AC voltage and comprises a couple of delayed interlocking circuits; the input ends of the delayed interlocking circuits are connected with driving PWM (pulse width modulation) signals of upper and lower IGBTs (insulated gate bipolar transistors) which are connected on the same phase in series, and the output ends of the delayed interlocking circuits are connected with the input ends of two IGBTs which are connected on the same phase in series; each delayed interlocking circuit comprises two PWM signal input units, an NPN type triode and a delay unit; the two PWM signal input units are respectively connected with upper transistor PWM signals and lower transistor PWM signals; one PWM signal input unit is connected with the base of the NPN type triode and the other PWM signal input unit is connected with the collector of the NPN type triode via a resistor R; the resistor R and a capacitor C form an RC delay circuit; and in the two delayed interlocking circuits in the same group, the PWM signals corresponding to the base of the NPN type triode are different. The inversion protection circuit has the advantages of simple and compact structure, low cost, good controllability and the like, and is stable and reliable in working.
Description
technical field [0001] The invention mainly relates to the field of circuit structure design, in particular to an inverter protection circuit. Background technique [0002] The working principle of the inverter circuit is to convert the DC voltage into the AC voltage of the required frequency. It periodically controls the on and off of the upper and lower bridge arm power switching devices, so that the output terminals U, V, A three-phase AC voltage with a phase difference of 120° electrical angle is obtained on the three phases of W. The working principle of the traditional inverter circuit (inverter) is to control the turn-on and turn-off of the IGBT through software, but the disadvantage of this method is that it is prone to software failures, causing the power switching devices to pass through and blow up. Contents of the invention [0003] The technical problem to be solved by the present invention is: aiming at the technical problems existing in the prior art, the p...
Claims
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IPC IPC(8): H02M1/32
Inventor 赵林冲汤世娟杨恢政张勇
Owner O&C ELECTRIC TECHN CO LTD