TWI785855B - Detection device - Google Patents

Abstract

A detection device is suitable for testing an object to be tested, and the object to be tested includes an input terminal, an output terminal for outputting an output voltage, and a control terminal. The detection device includes a power supply unit, a conversion unit, an adjustment unit, and a measurement unit pre-stored with a preset value. Using the conversion unit, a DC power supply and a pulse modulation signal can be used to generate a corresponding pulse voltage, and the adjustment unit can be used to adjust the duty cycle, frequency and voltage of the pulse voltage, so as to Change the magnitude of the output voltage corresponding to the pulse voltage, and test the various levels of circuits inside the DUT, and finally compare the measured results of the measurement unit with the preset value to judge the Whether the test object is functioning normally.

Description

Detection device

The invention relates to a test equipment, in particular to a detection device for detecting whether the function of a transformer is normal.

Generally, an electrostatic precipitator is installed in the internal working space of the factory to filter out dusty waste. When the dust collection efficiency of the electrostatic precipitator decreases or a failure occurs, a high-voltage transformer of the electrostatic precipitator will be detected first. The existing debugging method is to let the maintenance personnel operate a control system inside the electrostatic precipitator first, and switch to the test mode. At this time, the control system will send the test voltage to the high-voltage transformer, and the high-voltage transformer will output the test value, and after comparing with the preset reference value in the control system, the corresponding fault code will be displayed on the control On the panel of the system, then the maintenance personnel can make corresponding solutions to the fault codes.

Only when the high-voltage transformer that has been overhauled has not been reinstalled in the electrostatic precipitator, or the circuit board inside the high-voltage transformer is damaged and needs to be replaced with a new circuit board, the maintenance personnel cannot conduct the test immediately , to know that the overhaul is complete Check whether the function of the high-voltage transformer and the new circuit board is normal. In addition, the high-voltage transformer is usually installed on the top of the electrostatic precipitator, and every disassembly and assembly needs to be lifted by a large crane, which requires extremely high cost. Therefore, the existing detection device still needs to be improved.

Therefore, the purpose of the present invention is to provide a testing device for off-line testing and can reduce the cost.

Therefore, the detection device of the present invention is suitable for testing an object under test, and the object under test includes an input end for receiving an input voltage, an output end for outputting an output voltage to a load, and an electrical connection to the The input terminal is connected to the control terminal of the output terminal.

The detection device includes a power supply unit, a conversion unit electrically connected to the power supply unit, an adjustment unit electrically connected to the conversion unit, and a measurement unit suitable for electrically connecting the control terminal and the load and pre-stored with a preset value .

The power unit is used to provide a DC power. The conversion unit includes a frequency oscillation circuit for generating a pulse modulation signal, and a frequency oscillation circuit for receiving the pulse modulation signal and the DC power supply, and generating a pulse voltage to output to the control terminal, and making the The output end generates a power amplifier circuit corresponding to the output voltage of the pulse voltage.

The adjustment unit is used to adjust the duty cycle, frequency and voltage of the pulse voltage to change the output voltage.

The measuring unit includes a first measuring part suitable for measuring the output voltage, and a second measuring part used for measuring the pulse voltage, and according to the first measuring part and the second measuring part The measured result of the test piece is compared with the preset value to determine whether the test piece is in normal operation.

The effect of the present invention lies in: outputting the pulse voltage by the conversion unit, and cooperating with the adjusting unit, can adjust the duty cycle, frequency and voltage of the pulse voltage to generate the corresponding output voltage for testing. When the DUT is not on the computer, it is possible to confirm that the various functions and circuits of the DUT are operating normally, and then install the device or replace internal damaged components, so as to reduce the occurrence of failures after the DUT is on the computer. Normal operation occurs, avoiding repeated disassembly, inspection and increased time, manpower, and material costs.

1: Power supply unit

2: Conversion unit

21: Frequency oscillation circuit

211: pulse modulation signal

22: Power amplifier circuit

221: pulse voltage

3: Adjustment unit

4: Measuring unit

41: The first measuring piece

42: The second measuring piece

43: The third measuring piece

5: Feedback unit

6: Infrared emitting unit

61: Optical signal

62: Red LED

7: Photography unit

8: Masking unit

9: The object to be tested

91: input terminal

92: output terminal

93: Control terminal

931:Infrared receiver

932: indicator light

94: load

V _DC : DC power supply

V _in : input voltage

V _out : output voltage

V _fb : feedback voltage

Other features and effects of the present invention will be clearly presented in the implementation manner with reference to the drawings, wherein: Fig. 1 is a block flow chart illustrating the connection relationship between the detection device of the present invention and a test object; Fig. 2 is a A block flow diagram illustrating a first embodiment of the detection device of the present invention; Fig. 3 is a block flow diagram illustrating a first measuring part and a third measuring part of a measuring unit of the first embodiment, Connections for measuring an output voltage and a feedback voltage Formula; Fig. 4 is a block flow chart, illustrates the connection mode of one of the second measuring parts of this measuring unit of this first embodiment to measure a pulse voltage; Fig. 5 is a schematic diagram, illustrates a detection device of the present invention The second embodiment; and FIG. 6 is a schematic diagram illustrating the usage of the second embodiment.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same numerals.

Referring to Fig. 1, 2, a first embodiment of the detection device of the present invention is suitable for testing a test object 9, in this first embodiment, this test object 9 is a kind of being installed on the top of an electrostatic precipitator ( Figure not shown) high voltage transformer. The object under test 9 includes an input terminal 91 for receiving an input voltage V _in , an output terminal 92 for outputting an output voltage V _out to a load 94, and an electrical connection between the input terminal 91 and the output terminal 92 of the control terminal 93 . The input voltage V _in is set as an adjustable three-phase AC power supply from 0V to 10V. The load 94 uses a 6K ohm/250 watt power type resistor, and power type resistors of different specifications can also be selected to simulate the load 94 according to implementation requirements, and this is not a limitation.

The first embodiment includes a power supply unit 1, a conversion unit 2 electrically connected to the power supply unit 1, an adjustment unit 3 electrically connected to the conversion unit 2, and a pre-stored A measuring unit 4 with a preset value, and a feedback unit 5 electrically connected to the converting unit 2 and suitable for detecting the output voltage V _out to generate a feedback voltage V _fb . The power supply unit 1 is used to provide a DC power supply V _DC , specifically a power supply of a DC system, and the set voltage of the DC power supply V _DC is preferably 300V, and is used by the circuit of the conversion unit 2 .

The conversion unit 2 is a test instrument that simulates the existing control system of the object under test 9 and can be regulated according to the input conditions of the operator, and includes a frequency oscillator for generating a pulse wave modulation signal 211 A circuit 21, and one receiving the pulse modulation signal 211 and the DC power supply V _DC , and generating a pulse voltage 221 to output to the control terminal 93 accordingly, and making the output terminal 92 generate a corresponding pulse voltage 221 A power amplifying circuit 22 that outputs the voltage V _out . In the first embodiment, the adjustable range of the pulse voltage 221 is a voltage of 0V to 300V, a frequency of 10HZ to 40HZ, and a duty cycle of 0% to 50%.

The adjustment unit 3 is a knob-type variable resistor. The operator can change the resistance value of the adjustment unit 3 by turning the knob to adjust the duty cycle, frequency and voltage of the pulse voltage 221, thereby changing the output voltage. The size of V _out is used for testing with different supply voltage specifications.

3 and 4, the measuring unit 4 includes a first measuring piece 41 suitable for measuring the output voltage V _out , a second measuring piece 42 for measuring the pulse voltage 221, and a The third measuring element 43 is used to measure the feedback voltage V _fb . Specifically, the first measuring part 41 and the third measuring part 43 are three-purpose electric meters, and the second measuring part 42 is an oscilloscope. Specifically, the feedback unit 5 is a circuit that converts the output voltage V _out into the feedback voltage V _fb in proportion and sends it back to the control terminal 93 .

In the first embodiment, the first measuring element 41 and the third measuring element 43 are respectively directed to the output voltage V _out corresponding to the pulse voltage 221 generated by the output terminal 92 , and the feedback unit 5 The generated feedback voltage V _fb corresponding to the output voltage V _out is confirmed, and the second measuring device 42 is confirmed against the pulse voltage 221 received by the control terminal 93 of the object under test 9 . Finally, the results measured by the first measuring part 41, the second measuring part 42 and the third measuring part 43 are compared with the preset value to determine whether the object under test 9 is operating normally. The results are listed in Table 1 below.

It should be added that when the electrostatic precipitator absorbs more dust and causes the load 94 to increase as the usage time increases, the output voltage V _out will decrease and the dust collection efficiency will deteriorate. The feedback unit 5 will return the feedback voltage V _fb to the control terminal 93, and compare it with the preset value preset by the measurement unit 4, if the feedback voltage V _fb is lower than the preset When the value is high, the operator can know that the electrostatic precipitator is aging, and replace or repair it in advance, so as to avoid the electrostatic precipitator from failing without warning and causing greater losses.

The first embodiment uses the conversion unit 2 and the adjustment unit 3 to simulate the aforementioned A conventional control system supplies the test voltage of the object under test 9, so that the object under test 9 can be subjected to a functional test without being installed in the electrostatic precipitator (not shown in the figure), and it can be carried out with the measuring unit 4 By comparing with the preset value, it is possible to accurately know whether the condition input by the operator matches the output value of the object under test 9 to confirm whether the object under test 9 is operating normally, which greatly improves the convenience of the test operation.

Referring to Fig. 5, 6 and cooperate Fig. 2, be a second embodiment of the detection device of the present invention, the difference between this second embodiment and this first embodiment shown in Fig. 2 is: this detection device also comprises an infrared ray A transmitting unit 6 , a photographing unit 7 , and a shielding unit 8 . It should be added that in the second embodiment, the object under test 9 is an IGBT circuit board installed inside the high voltage transformer, and the control terminal 93 of the object under test 9 has twelve sets of infrared receivers 931, and twelve groups of indicator lights 932 electrically connected to corresponding infrared receivers 931 respectively. The infrared receivers 931 and the indicator lights 932 are used to protect the circuit of the IGBT circuit board, and are generally electrically isolated by optocouplers, such as: electrostatic discharge, electromagnetic interference, and switching pulse... and other interference, and the optocoupler is composed of a light-emitting element and a light-detecting element, so the operator can change the output signal of the infrared emitting unit 6 to control the infrared receivers 931 and the indicator lights 932 Test to ensure that the function of the IGBT circuit board is not abnormal before installation.

The preferred setting of the input voltage V _in of the object under test 9 is a DC voltage of 1000V, and the setting value of the pulse voltage 221 input from the conversion unit 2 to the infrared emitting unit 6 is preferably 200V/20Hz, and is The load 94 is simulated by using five bulbs with specifications of 220V/40W connected in series.

The infrared emitting unit 6 is a light-emitting circuit composed of several red LEDs 62, which can receive the pulse voltage 221 and emit a light signal 61 to the control terminals 93 according to the frequency and amplitude of the pulse voltage 221. Infrared receiver 931.

The photographing unit 7 is preferably photographed by using a mobile phone video recording method to confirm the flashing state of the light signal 61. In addition to the advantages of being easy to obtain and use at any time, the main purpose is to allow the operator to first confirm the infrared emitting unit 6. function is working properly. The shielding unit 8 is preferably made of thick cardboard, which is suitable for blocking the control terminal 93 from receiving the light signal 61, but it can also be a board made of an opaque material, as long as the light signal 61 can be blocked and The infrared receivers 931 that cannot be transmitted to the control terminal 93 are sufficient, and are not limited thereto.

As shown in Figure 6, when actually using the second embodiment to test the object under test 9, the operator first drives the conversion unit 2 to input the pulse voltage 221 to the infrared emitting unit 6, and the infrared emitting unit 6 The light signal 61 will be generated according to the frequency and amplitude of the pulse voltage 221. At this time, the operator can use the camera unit 7 to confirm whether the light signal 61 is in a blinking state, and then align the infrared receivers 931 with the infrared light. The emitting unit 6 enables the infrared receivers 931 to receive the light signal 61 at the same time, and then generates the output voltage V _out according to the light signal 61, and then drives the light bulbs to operate. Finally, the operator blocks one of the infrared receivers 031 by the shielding unit 8 to confirm that when one of the infrared receivers 931 does not receive the light signal 61, the corresponding bulbs are indeed is turned off, thereby confirming that the functions of the infrared receivers 931 are normal.

In addition, since the object under test 9 is provided with the indicator lights 932 to confirm whether the functions of the infrared receivers 931 are abnormal, when the infrared receivers 931 receive the light signal 61, the indications All lights 932 will light up to represent the normal operation of the function. And if one of the indicator lights 932 is off, it means that the corresponding infrared receiver 931 is malfunctioning, and the operator can quickly and accurately find the fault and perform maintenance.

Furthermore, the operator can change the duty cycle, frequency, and voltage of the pulse voltage 221 to observe the light and dark changes of the bulbs, and cooperate with the measurement unit 4 to make the measured value consistent with the preset value. By comparison, it can be known whether the light and dark changes of the bulbs conform to the duty cycle, frequency and voltage of the pulse voltage 221 . In particular, the infrared emitting unit 6 , the photographing unit 7 and the shielding unit 8 of the second embodiment allow the operator to more flexibly use the same set of testing equipment used to test the high voltage transformer to test the IGBT circuit board.

To sum up, the detection device of the present invention replaces the aforementioned conventional control system through the power supply unit 1, the conversion unit 2 and the adjustment unit 3 to generate the adjustable pulse voltage 221, so that the high-voltage transformer can be Test before going on the machine, and cooperate with the measurement unit 4 to confirm whether the various functions of the high-voltage transformer are abnormal, so as to reduce After the high-voltage transformer is installed, the electrostatic precipitator cannot operate normally. In addition, the operator can use the same set of equipment to inspect the IGBT circuit board inside the high-voltage transformer, which is very convenient. Therefore, can really reach the purpose of the present invention.

But what is described above is only an embodiment of the present invention, and should not limit the scope of the present invention. All simple equivalent changes and modifications made according to the patent scope of the present invention and the content of the patent specification are still within the scope of the present invention. Within the scope covered by the patent of the present invention.

1: Power supply unit

2: Conversion unit

21: Frequency oscillation circuit

211: pulse modulation signal

22: Power amplifier circuit

221: pulse voltage

3: Adjustment unit

4: Measuring unit

5: Feedback unit

9: The object to be tested

91: input terminal

92: output terminal

93: Control terminal

94: load

V _DC : DC power supply

V _in : input voltage

V _fb : feedback voltage

Claims (10)

A detection device, suitable for testing an object under test, the object under test includes an input terminal for receiving an input voltage, an output terminal for outputting an output voltage to a load, and an electrical connection between the input terminal and the The control end of the output end, the detection device includes: a power supply unit, used to provide a DC power supply; a conversion unit, electrically connected to the power supply unit, and includes a frequency oscillation circuit used to generate a pulse wave modulation signal, and A power amplifying circuit that receives the pulse modulation signal and the DC power supply, generates a pulse voltage to output to the control terminal, and makes the output terminal generate an output voltage corresponding to the pulse voltage; an adjustment unit, Electrically connected to the conversion unit, used to adjust the duty cycle, frequency and voltage of the pulse voltage to change the output voltage; and a measurement unit, suitable for electrically connecting the control terminal and the load and storing a preset value, and includes a first measuring part suitable for measuring the output voltage, and a second measuring part for measuring the pulse voltage, and according to the first measuring part and the second The measured result of the measuring device is compared with the preset value to determine whether the DUT is operating normally. The detection device as claimed in claim 1 further includes a feedback unit electrically connected to the conversion unit and adapted to detect the output voltage to generate a feedback voltage. The detection device as claimed in claim 2, wherein the measurement unit further includes a third measurement part for measuring the feedback voltage. The detection device according to claim 1, wherein the first measuring part is a three-purpose electric meter. The detection device according to claim 3, wherein the third measuring device is a three-purpose electric meter. The detection device according to claim 1, wherein the second measuring device is an oscilloscope. The detection device according to claim 1, wherein the adjustment unit is a knob-type variable resistor. The detection device as claimed in claim 1, wherein the detection device further comprises an infrared emitting unit for receiving the pulse voltage and emitting a light signal to the control terminal accordingly. The detection device according to claim 8, wherein the detection device further comprises a photographing unit for photographing the blinking state of the light signal. The detection device as claimed in claim 8, wherein the detection device further comprises a shielding unit adapted to block the control terminal from receiving the optical signal.

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