Current sampling circuit of frequency conversion motor and frequency conversion device

A current sampling, variable frequency motor technology, applied in the direction of AC motor control, estimation/correction of motor parameters, electrical components, etc., can solve the problems of high cost and complex design of variable frequency drive boards, saving design costs and solving complex designs. , the effect of simplifying circuit design
CN108933552APending Publication Date: 2018-12-04QINGDAO HAIER INTELLIGENT ELECTRONICS +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
QINGDAO HAIER INTELLIGENT ELECTRONICS
Publication Date
2018-12-04

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Abstract

The invention discloses a current sampling circuit of a variable frequency motor and a variable frequency device. The current sampling circuit includes an MCU, an IPM, a variable frequency motor, a current sampling circuit and a processing circuit. The MCU, connected to the IPM, is used for outputting control signals to the IPM. The IPM, connected to the variable frequency motor, is used for providing a three-phase power supply for driving the variable frequency motor to work. The current sampling circuit, connected to the output of the three-phase power supply of the IPM, is used for collecting a work current of the variable frequency motor. The processing circuit includes a first resistor, a second resistor, and a third resistor. The first resistor and the second resistor are connected in series to provide a reference voltage. One end of the third resistor is connected to the connection of the first resistor and the second resistor, and the other end of the third resistor is connected to an output end of the current sampling circuit. Processing of the sampling circuit is realized by reasonable configuration, adjustment and amplification of resistance.
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Description

technical field

[0001] The invention belongs to the technical field of variable frequency motors, and in particular relates to a current sampling circuit and frequency conversion equipment of a variable frequency motor. Background technique

[0002] As a relatively advanced motor, the frequency conversion motor can greatly improve the performance of existing frequency conversion equipment such as washing machines.

[0003] In the control of the variable frequency motor, the MCU on the variable frequency drive board sends control signals to the IPM module (intelligent power module), and the switching device inside the IPM module controller converts the DC power into a three-phase power supply to drive the variable frequency motor. During this process It is necessary to collect the output current signal and feed it back to the MCU to form a closed-loop control, and at the same time, it can prevent the device from being damaged by too much current.

[0004] In the existing var...

Claims

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