Temperature acquisition device for cooling fins in power units of high-voltage inverter
A high-voltage inverter, power unit technology, applied in the direction of using electrical devices, thermometers, measuring devices, etc., can solve the problem of high cost of heat sink temperature acquisition, improve safety, reduce costs, and achieve the effect of isolation
Inactive Publication Date: 2013-11-20
XINFENGGUANG ELECTRONICS TECH CO LTD
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Problems solved by technology
The digital output IC temperature sensor only reduces the AD sampling circuit, and the temperature acquisition cost of the heat sink in the power unit of the high-voltage inverter will be high
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[0014] The invention adopts a digital temperature sensor DS18B20 chip, and isolates the signal of the control circuit from the input and output signals of the DS18B20 chip with a high-speed optocoupler.
[0015] Such as figure 1 As shown, the DS18B20 chip is a single-bus chip with only one data pin, which has input and output functions, while the optocoupler chip transmits signals in one direction. In the present invention, one optical coupler 2 is used as the input signal transmission of the DS18B20 chip, another optical coupler 1 is used as the output signal transmission of the DS18B20 chip, and the read and write operation of the DS18B20 chip is realized through the cooperation of two high-speed isolated optocouplers. The reading and writing of the DS18B20 chip is time-sharing. When the writing operation of the DS18B20 chip is performed, the DS18B20 chip cannot read data. After the command is written to the DS18B20 chip, the data of the DS18B20 chip is read. Aiming at this...
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A temperature acquisition device for cooling fins in power units of a high-voltage inverter is characterized in that a digital temperature sensor DS18B20 is adopted to isolate a signal of a control circuit from an input and output signal of the digital temperature sensor DS18B20 through a high-speed optical coupler; a power supply of the digital temperature sensor DS18B20 is completely independent of a power supply of the control circuit, so that an electric potential of each cooling fin is the same as that of the digital temperature sensor DS18B20; and the digital temperature sensor DS18B20 is reliably contacted with the cooling fins in the power units of the high-voltage inverter, then the temperature is transmitted to a control chip CPLD inside each unit, the CPLD transmits the temperature to a master control through an optical fiber, the master control display the temperature through a touch screen, and the temperatures of the cooling fins of all power units of the high-voltage inverter can be monitored on the touch screen. The temperature acquisition device for the cooling fins in the power units of the high-voltage inverter has the advantages of few components, simple circuit, high working reliability, strong practicability and high isolation voltage.
Description
technical field [0001] The invention relates to a temperature acquisition device, more specifically, a detection device for the temperature of a heat sink in a power unit of a high-voltage frequency converter. Background technique [0002] There are many existing temperature detection devices, and there are many types of temperature sensors. There are four main types of temperature sensors: thermocouple, thermistor, resistance temperature detector (RTD) and IC temperature sensor. IC temperature sensors include two types of analog output and digital output. [0003] Traditional temperature detection devices cannot achieve high isolation voltage, or the circuit is complicated and the cost is high. Thermocouples, thermistors, resistance temperature detectors (RTDs), and analog output IC temperature sensor outputs are all analog, and AD sampling circuits need to be added to convert them into digital signals required by the control chip. If the high isolation between the contro...
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IPC IPC(8): G01K7/00
Inventor 荣凯郭少明魏学森郭延冲刘明光刘兴状郑培峰任成东张晓飞
Owner XINFENGGUANG ELECTRONICS TECH CO LTD