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Motor drive circuit eliminating output leakage current

A motor drive circuit, leakage current technology, applied in the direction of AC motor control, electrical components, control systems, etc., can solve problems such as capacitor C leakage current, and achieve the effect of solving leakage current

Active Publication Date: 2015-11-04
SHANGHAI MICRO ELECTRONICS EQUIP (GRP) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of leakage current due to capacitor C in the LC filter circuit, the present invention provides a motor drive circuit that eliminates output leakage current

Method used

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  • Motor drive circuit eliminating output leakage current
  • Motor drive circuit eliminating output leakage current
  • Motor drive circuit eliminating output leakage current

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Embodiment Construction

[0017] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0018] like figure 2 and Figure 4 shown, figure 2 It is the output circuit diagram of the motor drive circuit board involved in the present invention, Figure 4 It is a circuit block diagram of the motor driving circuit board involved in the present invention. The motor drive circuit mainly includes a rectifier circuit 403 , an output filter circuit 404 , a pre-stage input circuit 401 , a PWM output circuit 402 , and a feedback circuit 405 . The feedback circuit 405 is provided between the output filter circuit 404 and the input circuit 401 .

[0019] The rectification circuit 403 is an H-bridge rectification circuit, including four MOSFET transistors M1 , M2 , M3 and M4 . The four MOSFET transistors M1, M2, M3 and M4, the common terminal voltage Volt_H of the upper bridge arm, and the common terminal voltage Volt_L of the lower bridge...

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Abstract

The invention discloses a drive circuit sampling and amplifying a leakage current measured by a measuring circuit and passing through a C (capacitor) in an LC filter circuit and further sending the leakage current signal to a pre-stage Vset circuit in a feedback way. The motor drive circuit eliminating an output leakage current comprises a pre-stage input circuit, a PWM output circuit, a rectifying circuit, an output filter circuit and a feedback circuit which are sequentially connected. The feedback circuit is arranged between the output filter circuit and the pre-stage input circuit. The feedback circuit which comprises a leakage current sampling circuit and a signal amplifying circuit is used for sampling the leakage current of the output filter circuit and further sending the leakage current to the pre-stage input circuit as feedback.

Description

technical field [0001] The invention relates to the technical field of high-precision motor manufacturing and control, in particular to a motor drive circuit for eliminating output leakage current. Background technique [0002] In order to improve the output accuracy, the LC filter circuit is often used in the output circuit of the high-precision motor drive circuit board. like figure 1 as shown in figure 1 The LC filter circuit in the circuit is mainly to filter out some specific frequency noise and interference, but due to the existence of capacitor C in the LC or RC circuit, there is a small leakage current flowing from C, and the magnitude of the leakage current is related to the output current frequency and current The value is related to the value, because the leakage current has inconsistent values ​​at different times and cannot be ignored. SUMMARY OF THE INVENTION [0003] In order to solve the problem of leakage current due to capacitor C in the LC filter circ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P25/16
Inventor 王恒和
Owner SHANGHAI MICRO ELECTRONICS EQUIP (GRP) CO LTD
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