Power supply circuit of an electric and corresponding control method

A power supply voltage and circuit technology, applied in the field of power supply circuits, can solve the problems of complex structure, high cost and high harmonic components of the interrupter control circuit

Inactive Publication Date: 2009-08-19
MAGNETEK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These circuits have drawbacks such as high harmonic content in the motor supply voltage (especially for triac controllers) and high cost due to the use of high voltage components and complex control circuits
The production of interrupter control circuits also suffers from a certain degree of structural complexity due to the necessity to use controlled switches operating at a higher frequency than the grid frequency

Method used

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  • Power supply circuit of an electric and corresponding control method
  • Power supply circuit of an electric and corresponding control method
  • Power supply circuit of an electric and corresponding control method

Examples

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Embodiment Construction

[0025] figure 1 Briefly shows the constant voltage power supply circuit for single-phase asynchronous motor. Reference 1 denotes an AC voltage source, including for example a power grid, a generator device or other sources. The number 3 designates in a general way the motor, which is schematically represented by an inductor 5 and a resistor 7 connected in parallel.

[0026] The motor 3 and the voltage source 1 are connected in a full bridge comprising controlled switches 11, 12, 13 and 14, for example comprising the same number of MOSFETs or other switching devices controlled by a control logic 17 which outputs 17A-17D To toggle switches 11-14.

[0027] A DC branch 18 comprising a storage capacitor 19 is connected in parallel with the bridge 11-14. As will be clear from the following description, the control logic 17 controls the switching of the switches 11-14 according to the voltage across the motor 3 and the phase of the power supply voltage. This control method produce...

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Abstract

This article describes a circuit for controlling the supply voltage of a motor. This circuit includes: a device for detecting the difference between the grid voltage (V1) and the reference voltage (Vp) and a device (11-14, 17) for generating an alternating correction voltage (V2), the frequency of the correction voltage (V2) The frequency is the same as the grid voltage (V1) and is phase-shifted relative to said grid voltage (V1). The phase shift between the grid voltage and the correction voltage is proportional to the difference between the grid voltage and the reference voltage, and the correction voltage (V2) is added to the grid voltage (V1).

Description

technical field [0001] The invention relates to a power supply circuit of the stabilized or at least regulated type for motors, with the aim of maximizing the efficiency of the motor or regulating the speed of the motor, in particular for asynchronous motors, and in particular - but not exclusively - for single-phase asynchronous motors. [0002] The invention also relates to a motor comprising a voltage-regulated type power supply circuit and a method of controlling the power supply voltage of the motor. Background technique [0003] In motor design, it is assumed that the power supply is constant voltage, and the goal of motor design is to optimize the performance of the motor when designing the voltage. The design voltage range is generally within 200-230V or according to the grid voltage adopted by the country where the motor is used. have other values. [0004] In fact, the mains voltage is not constant due to possible voltage fluctuations in the grid and due to the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/00H02P27/02H02P25/04
CPCH02P25/04
Inventor 安东尼奥·卡诺瓦戴维·马蒂尼
Owner MAGNETEK
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