CN201527309U - Temperature measuring device of high-voltage reactive compensation power unit - Google Patents

Abstract

The utility model provides a temperature measuring device of a high-voltage reactive compensation power unit, which can reliably measure actual temperature of a thyristor and lead high-voltage electric and electronic devices such as thyristors to work safely. The temperature measuring device comprises a sampling circuit, a conditioning circuit, a single chip microcomputer and a transmission portion. The temperature measuring device utilizes DC+15V to supply power, and the single chip microcomputer utilizes an active 4M crystal oscillator. The temperature measuring device of a high-voltage reactive compensation power unit have accurate measurement, fine high and low voltage isolation and safety and strong anti-interference capacity, and guarantees authenticity of measured value.

Description

The temperature measuring equipment of high-pressure reactive compensation power cell

(1) technical field

The utility model relates to the high-tension apparatus field, is specifically related to a kind of temperature measuring equipment of high-pressure reactive compensation power cell.

(2) background technology

What power electronic devices such as thyristor were a large amount of is applied on the high-tension apparatus; these device work all need have the restriction of temperature; the temperature survey of these devices is of crucial importance; the device of measuring temperature at present is a lot; mostly for measuring low-voltage equipment; and adopting is that to isolate with the air with equipment be that the method for medium is measured, and the error of measurement is bigger, and it is not quite reasonable being used in the protection of thyristor.

(3) summary of the invention

The utility model purpose is to provide a kind of true temperature of reliable measurement thyristor, can allow the temperature measuring equipment of the high-pressure reactive compensation power cell that the power electronic devices of high pressure such as thyristor works safely.

The utility model is achieved in that it comprises sample circuit, modulate circuit, single-chip microcomputer, hop.This device is main to adopt a kind of temperature sensor that can directly be attached on the thyristor heat radiator to sample, the analog signal conversion of temperature is become voltage signal, through the processing of modulate circuit faint voltage signal is amplified again, A/D function by single-chip microcomputer is the analog signal conversion digital signal, and the form by the PWM ripple is sent to host computer with optical fiber.

The utility model has the advantages that: can accomplish that precision measure, high-low pressure are isolated, security is good, antijamming capability is strong, guarantee the authenticity of measured value.

(4) description of drawings

Fig. 1 is a schematic diagram of the present utility model

Fig. 2 is a power circuit diagram

Fig. 3 is a sampling sensor

Fig. 4 is a modulate circuit

Fig. 5 is a center processor

Fig. 6 is a hop

(5) embodiment: this device is main to adopt a kind of temperature sensor that can directly be attached on the thyristor heat radiator to sample, the analog signal conversion of temperature is become voltage signal, through the processing of modulate circuit faint voltage signal is amplified again, A/D function by single-chip microcomputer is the analog signal conversion digital signal, and the form by the PWM ripple is sent to host computer with optical fiber.This device adopts the DC+15V power supply, and single-chip microcomputer adopts the work of active 4M crystal oscillator.

The theory diagram of this device mainly divides five parts: power unit, sampling section, conditioning part, A/D processing section, hop.

Power unit: as shown in Figure 2, this device adopts the DC+15V power supply through the S1 shaping, and LED light is housed, C1, C2 filtering, protective circuit of diode, with 7805 general+15V convert to+5V powers to other devices.

Sampling section: as shown in Figure 3, but the temperature sensor LM35DT of sampling section utilization contact, this sensor has the precision height of measurement, and scope is big, characteristics low in energy consumption.Sensor can be attached on the outer wall of heat radiator, this sensor can convert tested temperature signal to voltage signal, and 1 ℃ of corresponding sampled signal of the every variation of temperature changes 10mV.

Conditioning part: as shown in Figure 4,, move voltage signal about 2.5V on signal to, again through the conditioning of main amplifying circuit U3 through the combination of R2 and R5 because the voltage signal that gathers is very faint.Be decided to be 0 ℃ of signal of standard with 2.5V, 1 ℃ of voltage signal of every variation changes 0.2V, helps the processing of single-chip microcomputer like this.

A/D calculating section: as shown in Figure 5, this part adopts 8 single-chip microcomputers of low side of AVR, this single-chip microcomputer have one independently frequency divider 8 bit timing device/counters and two PWM passages, contain 4 tunnel 10 ADC of sheet internal reference voltage, have the reliable programming WatchDog Timer of individual sheets internal oscillator.The A/D function that carries with single-chip microcomputer converts the voltage signal that sends to digital signal, and it is that 5V calculates by formula 1-1 that reference voltage is decided supply voltage

$\mathrm{ADC}=\frac{V_{\mathrm{IN}}\·1024}{V_{\mathrm{REF}}}$

1-1

Utilize the quick PWM wave mode of single-chip microcomputer, the computing method of formula 1-2 send the form of digital signal with the PWM ripple.

$f_{\mathrm{OCnx}}=\frac{f_{\mathrm{clk}\_I/\mathrm{<figure-callout\; id="2"\; label="O"\; filenames="H2009201008791E00012.png,H2009201008791E00021.png"\; state="\{\{state\}\}">O</figure-callout>}}}{2\&CenterDot;N\&CenterDot;(1+\mathrm{OCRnx})}$

1-2

Hop: as shown in Figure 6, this part is utilized optical fiber technology, adopts fiber optic transmitter T-1533 to send the PWM ripple to host computer, and this part is with the low-pressure section of host computer and tested high-pressure section isolation, safe and reliable.

The temperature sensor of first is close to preferably smears some silicone grease on the heat radiator and make its full contact, help accurate measurement.Because the interference of high-pressure section is stronger, the output of sensor is connected with this device with maskable cable.The optical fiber of the 5th part is connected, and the work of getting final product powers on.

Claims (5)

1. the utility model is a kind of temperature measuring equipment of high-pressure reactive compensation power cell, it is characterized in that it comprises sample circuit, modulate circuit, single-chip microcomputer, hop.Sample circuit connection modulate circuit, modulate circuit connect single-chip microcomputer, single-chip microcomputer connects host computer by optical fiber.

2. the temperature measuring equipment of high-pressure reactive compensation power cell according to claim 1 is characterized in that described sample circuit, converts tested temperature signal to voltage signal.

3. the temperature measuring equipment of high-pressure reactive compensation power cell according to claim 1 is characterized in that described modulate circuit is decided to be 0 ℃ of signal of standard with 2.5V, and 1 ℃ of voltage signal of every variation changes 0.2V.

4. the temperature measuring equipment of high-pressure reactive compensation power cell according to claim 1 is characterized in that described Chip Microcomputer A/D calculating section, divides 8 single-chip microcomputers of low side that adopt AVR.

5. the temperature measuring equipment of high-pressure reactive compensation power cell according to claim 1 is characterized in that described hop, adopts fiber optic transmitter T-1533 to send the PWM ripple to host computer.

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