Driving and protection device of full-isolation three-phase inverter
A technology of protection device and frequency converter, applied in the field of frequency conversion, can solve the problems of strong corrosion, large dust, reducing the working reliability of the drive device, etc.
Inactive Publication Date: 2012-10-03
NO 70 INST OF CHINA NORTH IND GRP
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Problems solved by technology
Regardless of its working characteristics or electrical characteristics, the existing inverter drive device has the following shortcomings: (1) The drive device has high operating voltage, large current, large power consumption of power devices, serious heat generation, and extremely prone to circuit failures. Bring hidden dangers to safe production; (2) The controlled object of the driving device has a large working current and high price and cost, and most of them are key components or actuators of the product, so detailed safety protection measures are especially necessary; (3) Inverter In most cases, it is used for industrial control, and its working environment is harsh, such as large dust, high temperature, high humidity, strong corrosion, and even often works in an electrical environment with severe electromagnetic interference, strong current, and high voltage. Greatly reduces the operating reliability of the drive
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[0028] A fully isolated three-phase inverter drive and protection device, such as figure 1 As shown, it includes control power supply rectification circuit 1, power supply rectification circuit 2, flyback multi-channel switching power supply circuit 3, voltage stabilized power supply circuit 4, mutual inductance overcurrent detection circuit 5, Hall type current detection circuit 6, photoelectric Isolated power supply overvoltage detection circuit 7 and phase voltage drive circuit 8, wherein:
[0029] The control power supply rectification circuit 1 is used for rectification, and converts the industrial frequency power supply into a DC power supply for supplying power to the isolated interface circuit;
[0030] The power supply rectification circuit 2 is used for rectification, and the power frequency power supply is rectified into a DC power supply that provides a power source for the phase voltage drive circuit 8;
[0031] The flyback multi-channel switching...
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The invention relates to a driving and protection device of a full-isolation three-phase inverter. A control power supply rectifier circuit converts power frequency power supply to direct-current power supply. A power power-supply rectifier circuit converts power frequency current to direct-current power supply. A flyback multiple-way switch power circuit converts power source direct-current power supply to non-voltage-stabilizing system power supply and floating power supply for providing high-end drive. A voltage-stabilized power supply circuit converts non-voltage-stabilizing system power supply to stabilized power supply. A mutual inductance overcurrent detection circuit converts current signals to current feedback signals. A Hall current detection circuit converts current signals to current feedback signals capable of being distinguished by a single microcomputer chip. A photoelectric isolation power power-supply overvoltage detection circuit converts power source direct-current power supply to overvoltage detection signals capable of being distinguished by the single microcomputer chip. A phase voltage driving circuit converts power source direct-current power supply to three-phase adjustable alternating-current signals. By aid of the driving and protection device, physical isolation effect of different electrical characteristics in the same control device is achieved, and electromagnetic compatibility of the device is greatly improved.
Description
[0001] technical field [0002] The invention belongs to the technical field of frequency conversion, and in particular relates to a fully isolated three-phase frequency converter drive and protection device. Background technique [0003] As a branch of microelectronic control and power drive technology, frequency conversion technology is widely used in daily life, industrial control, agricultural production and other fields. Especially due to the energy-saving effect of frequency conversion technology, its application scope has been further expanded, such as motors, water pumps, air conditioners, elevators and other industries have left the footprint of frequency conversion technology. [0004] Three-phase frequency conversion technology is a technology that converts the mains power to the required voltage and frequency through a power conversion device. It is especially suitable for some high-power loads that require long-term continuous operation, such as fans / pum...
Claims
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IPC IPC(8): H02M5/44
Inventor杨俊恩褚全红孟长江白思春
OwnerNO 70 INST OF CHINA NORTH IND GRP