A positive and negative power supply current expansion device in an h-bridge control circuit
A technology for controlling circuits, positive and negative power supplies, applied in output power conversion devices, control/regulation systems, electrical components, etc. full volume effect
Active Publication Date: 2017-03-22
CHINA AEROSPACE TIMES ELECTRONICS CORP
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Problems solved by technology
The gate control voltage is generally generated by a high-power high-speed optocoupler, and to make the high-power high-speed optocoupler generate a control signal with a strong load capacity, the power supply of the high-power high-speed optocoupler must have a strong load capacity, so when the circuit When the power reaches a certain level, it is necessary to expand the load capacity of the power supply of the high-power high-speed optocoupler, and the power supply module with large power is generally a switching power supply. To make the MOS tube on the H bridge arm not misconduct, an additional Good shielding measures increase the size of the circuit, which makes the high efficiency and small size of the switching power supply not reflected on the H bridge, and its cost is very high
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[0014] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0015] Such as figure 1 A positive and negative power supply current expansion device in the H bridge control circuit shown is characterized in that it includes a positive current expansion circuit 100, a negative current expansion circuit 200, an upper half bridge drive circuit 300 of the H bridge, and a lower half bridge drive circuit of the H bridge 400 and H-bridge load LOAD; the positive current expansion circuit 100 includes the first capacitor C1, the third capacitor C3, the first positive voltage regulator U1, the first NPN current expansion transistor Q1 and the first resistor R1; the negative current expansion circuit 200 includes The second capacitor C2, the fourth capacitor C4, the first negative regulator U2, the first PNP current expansion transistor Q2 and the second resistor R2; the H-bridge upper half-bridge driving circuit 30...
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The invention relates to a positive-negative power supply current expanding apparatus in an H bridge control circuit. The apparatus comprises a positive current expanding circuit, a negative current expanding circuit, an H-bridge upper half-bridge drive circuit, and H-bridge lower half-bridge drive circuit. A first capacitor C1, a first positive voltage regulator U1, and a first resistor in the positive current expanding circuit and a second capacitor C2, a first negative voltage regulator U2, and a second resistor R2 in the negative current expanding circuit respectively adjust inputted positive and negative power supplies to have the needed positive and negative voltage values; and a first NPN current-expanding triode Q1 and a first PNP current-expanding triode Q2 respectively carry out load capacity expansion on the positive and negative voltages, so that the current output capacities of the positive and negative voltages are substantially improved and thus the current demand of H bridge working can be met. According to the invention, compared with the power supply module with the identical power on the market, the provided apparatus has characteristics of low interference, short manufacturing period, and low cost.
Description
technical field [0001] The invention belongs to the technical field of electronic technology and power supply voltage stabilization, and is a positive and negative power supply current expansion device that can be applied in an H bridge control circuit. Background technique [0002] In the H-bridge drive circuit, due to the large switching capacitance of the high-power MOS tubes of the upper and lower bridge arms, a large current will flow through the gate at the moment of switching, which puts forward requirements on the current capability of the gate drive voltage. The H-bridge The greater the power of the control object, the greater the power of the MOS tube, and thus the larger the switching capacitance of the MOS tube, and the stronger the current capability of the gate drive voltage. The gate control voltage is generally generated by a high-power high-speed optocoupler, and to make the high-power high-speed optocoupler generate a control signal with a strong load capac...
Claims
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IPC IPC(8): H02M3/155
Inventor 张奇葛志雄王崇李梦馨李静牛盅凯
Owner CHINA AEROSPACE TIMES ELECTRONICS CORP