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Bus current sampling asymmetric pulse width modulation method

A technology of pulse width modulation and bus current, applied in motor control, motor generator control, electromechanical brake control, etc., can solve the problems of increasing switching loss and increasing switching times, so as to increase switching loss and reduce the introduction of harmonics , to ensure the effect of accuracy

Active Publication Date: 2020-06-16
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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Problems solved by technology

But it also increases the switching times, increases the switching loss, and introduces high-frequency harmonics

Method used

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  • Bus current sampling asymmetric pulse width modulation method
  • Bus current sampling asymmetric pulse width modulation method
  • Bus current sampling asymmetric pulse width modulation method

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Embodiment Construction

[0057] The present invention will be further described below in conjunction with accompanying drawing.

[0058] The bus current sampling asymmetric pulse width modulation method of the present invention has a control system, and the control system includes such as figure 1 circuit connections shown, and as figure 2 The flow chart of the asymmetric pulse width modulation method for bus current sampling is shown. In the DC bus sampling phase current reconstruction technology, the current information on the DC bus is obtained by installing a current detection unit on the DC bus.

[0059] Additionally, if Figure 3a-3b As shown, the current detection unit can be installed in both the high side and the low side of the three-phase bridge inverter. The relationship between the instantaneous current of the DC bus and the phase current of the motor depends on the switching state of the inverter, that is, the relationship between the DC bus current and the phase current of the motor ...

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Abstract

The invention discloses a bus current sampling asymmetric pulse width modulation method, which comprises a three-phase bridge inverter circuit and a bus current detection unit, and comprises the stepsof generating an initial phase; checking the initial moment; determining a sampling moment according to the rising edge position of the PWM initial phase; sampling the current value of a direct current bus; and calculating the magnitude of the third phase current ib according to a formula ia+ib+ic=0. According to the invention, by analyzing related factors which may influence the current stability, reasonable sampling delay is set, and the current sampling accuracy of the direct current bus is ensured.

Description

technical field [0001] The present application relates to a current sampling technology, in particular to the detection field of motor phase current of a permanent magnet synchronous motor. Background technique [0002] Permanent magnet synchronous motor (Permanent Magnet Synchronous Motor, PMSM) has many advantages such as high power density, wide speed range and fast dynamic response, and is widely used in servo drive, electric vehicle and other fields. In the permanent magnet synchronous motor drive system, the voltage space vector pulse width modulation (SVPWM) technology has become the main control method of the existing permanent magnet synchronous motor servo system because of its good static and dynamic performance. The phase current of the motor is a key parameter of the vector control system and the protection strategy. Accurate detection of the phase current of the motor is of great significance to improve the performance of the control system. Generally, in orde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/22H02P25/024H02P27/08
CPCH02P21/22H02P25/024H02P27/08H02P2205/01H02P2207/05Y02T10/64
Inventor 申永鹏郑竹风刘普杨小亮贺振东王延峰杨存祥唐耀华孟步敏王前程李元丰
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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