CN215813290U

CN215813290U - High-voltage sensor test bench

Info

Publication number: CN215813290U
Application number: CN202121848177.9U
Authority: CN
Inventors: 邵琦; 张煜; 吴浩
Original assignee: Shanghai Metro It Co ltd
Current assignee: Shanghai Metro It Co ltd
Priority date: 2021-08-09
Filing date: 2021-08-09
Publication date: 2022-02-11
Anticipated expiration: 2031-08-09

Abstract

The utility model provides a high-voltage sensor test bench, which comprises: the power supply comprises a power supply module, a UC3842 circuit, an IGBT (insulated gate bipolar transistor) tube, a main transformer and a digital display screen; the power module supplies power to each components and parts, through power module, UC3842 circuit and IGBT pipe make main transformer produce the test high pressure, test being surveyed high-voltage sensor, digital display screen includes first display screen and second display screen, first display screen and second display screen are connected with being surveyed high-voltage sensor's input and output respectively, show the magnitude of voltage at both ends, thereby compare the magnitude of voltage at both ends and obtain the testing result. The utility model has simple structure, greatly reduces the labor intensity, saves a large amount of manpower and material resources, improves the working efficiency and has the advantages of low cost and high testing reliability when detecting the high-voltage sensor.

Description

High-voltage sensor test bench

Technical Field

The utility model relates to the field of testing devices, in particular to a high-voltage sensor testing table, and particularly relates to a subway train high-voltage sensor testing table.

Background

The high voltage sensor (hereinafter referred to as high voltage sensor) is widely applied to a traction box and an auxiliary reversing box of a subway train, and is one of important components for ensuring the normal operation of the train. The performance detection of the high-voltage sensor is a necessary work for the overhaul and the daily maintenance of the train frame. The high-voltage sensors have different brands and models, and are produced by manufacturers such as China, German Siemens, France Alston and the like. Originally, the detection aiming at the high-voltage sensor can only be carried out by means of a traction box body or an auxiliary reverse box body for integral test, and if the box body with complete functions does not exist or other maintenance operations are carried out on the box body, the detection of the high-voltage sensor cannot be carried out, so that the traditional detection mode has the defects of complex operation, long time for testing one sensor, high cost of manpower and material resources for installation, inspection, electrification, 1500V high-voltage test, power-off and shutdown, safe discharge and the like, and two persons, one operation and one monitoring are needed during the test.

In chinese utility model patent document with publication number CN207067377U, a testing device for voltage sensors is disclosed, which is used to test performance states of subway voltage sensors at different temperatures and record voltage data. The voltage transformation equipment enables the voltage to be transformed to the rated working voltage of the voltage sensor, the constant temperature box can set different temperatures required by the voltage sensor during detection, the constant temperature box enables the test to reach a constant temperature, and the accuracy of system detection data is improved. The device comprises a constant temperature box, an A/D acquisition module, a data processing main control board and a subway train voltage sensor, wherein the constant temperature box is internally provided with a voltage sensor to be detected and a standard voltage sensor, the A/D acquisition module is used for acquiring and transforming voltage data in the constant temperature box, the data processing main control board achieves data transmission control and compares voltage data results, and therefore the purpose of evaluating performance states of the subway train voltage sensor at different temperatures is achieved.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to provide a high-voltage sensor test bench.

According to the utility model, the high-voltage sensor test bench comprises: the power supply comprises a main power supply, a UC3842 circuit, an IGBT (insulated gate bipolar transistor) tube, a main transformer and a digital display screen;

the positive pole of the main power supply is respectively connected with the power supply end of the UC3842 circuit, the first port of the primary coil of the main transformer and the power supply end of the digital display screen, the output end of the UC3842 circuit is connected with the gate pole of the IGBT tube, the collector electrode of the IGBT tube is connected with the second port of the primary coil of the main transformer, the emitter electrode of the IGBT tube is connected with the negative pole of the main power supply, and the first port of the secondary coil of the main transformer forms the input connection end of the measured high-voltage sensor; the first port of the secondary coil of the main transformer is connected with a voltage division circuit, a sampling circuit, a voltage stabilizing circuit and an optical coupler, and is connected with the UC3842 circuit after passing through the voltage division circuit, the sampling circuit and the optical coupler;

the digital display screen comprises a first display screen and a second display screen, the first display screen is connected with the voltage division circuit, and the second display screen is connected with the output end of the measured high-voltage sensor.

Preferably, the main transformer is an isolation boosting transformer, and the input voltage of the isolation transformer is a square wave with 18V and the working frequency of 55-65 KHz.

Preferably, the main power supply is connected with an 18V power supply, the 18V power supply supplies power to the UC3842 circuit, and the UC3842 circuit outputs square waves with the frequency of 55-65 KHz to a gate electrode of the IGBT tube.

Preferably, the main transformer consists of a plurality of groups of independent windings, and each group of windings is provided with an independent rectifying circuit, a filter circuit and a load circuit.

Preferably, a plurality of groups of independent windings are connected in series to form a high-voltage output end of the main transformer.

Preferably, a switch protection absorption circuit and a power supply feedback circuit are connected between the collector of the IGBT tube and the first port of the primary coil of the main transformer, the switch protection absorption circuit is used for absorbing interference waves generated by the main transformer, and the power supply feedback circuit is used for stabilizing and adjusting the output of the main transformer.

Preferably, a switch device protection sampling circuit is connected between the IGBT tube and the negative electrode of the main power supply, the switch device protection sampling circuit includes a protection resistor, one end of the protection resistor is connected with the emitter of the IGBT tube and the No. 3 pin of the UC3842 circuit, and the other end of the protection resistor is connected with the negative electrode of the main power supply.

Compared with the prior art, the utility model has the following beneficial effects:

1. the utility model has simple structure, and greatly reduces the labor intensity when detecting the high-voltage sensor;

2. the utility model can complete the detection work by only one person, thereby saving a large amount of manpower and material resources;

3. the utility model improves the working efficiency and has the advantages of low cost and high test reliability.

Drawings

Other features, objects and advantages of the utility model will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a block diagram of a high voltage sensor testing platform according to an embodiment of the present invention;

fig. 2 is a circuit diagram of a high voltage sensor testing platform according to an embodiment of the present invention.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the utility model, but are not intended to limit the utility model in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the utility model. All falling within the scope of the present invention.

The utility model introduces a high-voltage sensor test bench, which comprises the following components in parts by weight with reference to fig. 1 and 2: the main power supply, the UC3842 circuit, the IGBT pipe, main transformer, and digital display screen. The main power supply is a 220V mains supply input and outputs 100V/150W power supply with isolation. The main power supply supplies power to the voltage power supply of each component in the test platform, and the main power supply outputs 100V to a first port of a primary coil of the main transformer. The main transformer adopts an isolation boosting transformer, and an input power supply of the isolation boosting transformer is a square wave with 18V and the working frequency of 55-65 KHz. The main transformer consists of a plurality of groups of independent windings, and each group of windings is provided with an independent rectifying circuit, a filter circuit and a load circuit. The multiple groups of independent windings are connected in series and then form the high-voltage output end of the main transformer.

The UC3842 circuit is powered by an 18V power supply, the 18V power supply is powered and input by a main power supply, and a current-limiting protection circuit, a voltage stabilizing circuit, a duty ratio control adjusting circuit (for adjusting pulse width) and the like are arranged in the UC3842 circuit. After the UC3842 circuit is electrified and works, a pulse voltage with controllable pulse width and pulse frequency of 55 KHz-65 KHz is generated and supplied to the IGBT tube for working. When the power-on circuit is started, the UC3842 circuit generates a square wave with the duty ratio of 0% and the frequency of the main frequency of 55-65 KHz, the square wave is amplified by the power in the UC3842 circuit, the square wave is output by a pin 6 of the UC3842 circuit to control a switching device IGBT tube, and the pin 6 of the UC3842 circuit is connected with a gate electrode of the IGBT tube.

The pulse voltage output by the UC3842 circuit controls an IGBT tube connected with a primary coil of a main transformer, and the input voltage of the main transformer is a square wave with 18V and the working frequency of 55-65 KHz. When the IGBT tube starts to perform switching work, the primary end K1 end of the main transformer T1 is provided with 100V power supply, and when current passes through the primary coil of the main transformer, the current passes through the IGBT tube with the switching function, and then the switching device protects the sampling circuit to the negative electrode of a 100V power supply to form a power supply loop. When the IGBT tube switch works, the current flowing through the primary side of the main transformer is pulsating and alternating, an alternating magnetic field is generated on the iron core of the transformer, and the main transformer starts to perform boosting work due to the alternating magnetic field. Then, in order to make the high voltage have stable output, at the same time, the output can have an output voltage regulation range, for example, the output is 750V-1900V. Therefore, a voltage division sampling circuit is adopted in high-voltage output, a pulse signal width adjusting circuit is added in the sampling circuit, and closed-loop control is performed on the pulse circuit generated by UC3842 through an optical coupler. When the output voltage is to be increased, the pulse width is adjusted to be larger. When the pulse width is reduced, the output voltage decreases.

And the collector electrode of the IGBT tube is connected with the second port of the primary coil of the main transformer, and the collector electrode of the IGBT tube is connected with the first port of the primary coil of the main transformer through a protection absorption circuit and a power supply feedback circuit. When the IGBT switching tube controls the primary current of the transformer, particularly when the IGBT switching tube is turned off, the transformer can generate a plurality of interference waves such as first harmonic wave, third harmonic wave and the like, the interference waves can influence the transformer and can also generate interference on other equipment, and therefore a protection absorption circuit is designed. The power supply feedback circuit is essentially a circuit for stabilizing the output power supply and is also a circuit for adjusting the output level. An emitting electrode of the IGBT tube and a negative electrode of the main power supply are connected in series with a switching device protection sampling circuit, the switching device protection sampling circuit comprises a protection resistor, one end of the protection resistor is connected with the emitting electrode of the IGBT tube and a No. 3 pin of the UC3842 circuit respectively, and the other end of the protection resistor is connected with the negative electrode of the main power supply. The function of the switching device protection sampling circuit is to detect the current flowing through the IGBT when the IGBT is turned on, a voltage value is generated on the protection resistor, the voltage value is input to the No. 3 pin of the UC3842, the working current of the IGBT is monitored by the comparison circuit inside the UC3842, and once the working current exceeds the upper limit value of the working current, the IGBT is forcibly turned off, so that the IGBT tube is protected in a current limiting mode.

Under the action of a No. 6 pin connected to a switching device IGBT tube, input 100V (K1 end) direct-current power supply voltage is chopped by a high-frequency device IGBT tube to form a pulsating voltage. The high-frequency chopped wave is converted into a pulsating alternating current, after passing through the main transformer, the voltage at the output end (G1 end) begins to rise, the raised voltage is supplied to the tested high-voltage sensor for input test, a group of high voltage is divided to a voltage dividing circuit and a sampling circuit from the high-voltage end of the tested high-voltage sensor, and the high-voltage end of the tested high-voltage sensor is connected with a first display screen after passing through the voltage dividing circuit and the sampling circuit, so that the high-voltage value of the tested high-voltage sensor is displayed; the second display screen is connected with the output end of the measured high-voltage sensor through the voltage conversion circuit.

After another group of high voltages are distributed on the high-voltage end of the measured high-voltage sensor and the voltage stabilization requirement is met through the voltage stabilizing circuit, the voltage stabilizing circuit outputs a signal voltage, the signal voltage is fed back to the UC3842 circuit through the optical coupling isolation circuit to turn off the input of the IGBT tube of the switching device, so that the chopping output is stopped, the coupling of the transformer is stopped, the output high voltage is not increased any more, and a stabilized closed loop is formed; and the stability requirement of output is realized. Other switch protection absorption and power supply feedback circuits and switch device protection circuit sampling and the like are used for protecting the IGBT tube in the working process of the circuit and are not described in more detail here.

The main transformer of the utility model has an output part composed of a plurality of independent windings. Each winding is composed of independent rectifying, filtering and resistance loads, and each independent output is superposed and supplied to a tested device. When the high-voltage sensor is tested, the input high voltage is regulated by a potentiometer, the regulation range of the high voltage is more than or equal to 600V to less than or equal to 1999V, and the potentiometer is installed in a UC3842 circuit.

The output of the high-voltage sensor is converted into voltage through a circuit and then displayed by a second display screen. When the performance of the high-voltage sensor is tested, the input voltage value of the tested device and the output voltage value of the tested device displayed by the digital display screen are compared, and when the digital error of the two gauge heads is 5%, the performance of the high-voltage sensor can be proved to be good. When the error of other numbers exceeds 5%, the performance of the device is reduced, and the device is generally repaired or scrapped.

In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the utility model. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims

1. A high pressure sensor test stand, comprising: the power supply comprises a main power supply, a power supply module, a UC3842 circuit, an IGBT tube, a main transformer and a digital display screen;

2. A high pressure sensor test bench according to claim 1, wherein: the main transformer adopts an isolation boosting transformer, and the input voltage of the isolation boosting transformer is a square wave with 18V and the working frequency of 55-65 KHz.

3. A high pressure sensor test bench according to claim 2, wherein: the power supply is connected with an 18V power supply, the 18V power supply supplies power to the UC3842 circuit, and the UC3842 circuit outputs square waves with the frequency of 55-65 KHz to a gate pole of an IGBT tube.

4. A high pressure sensor test bench according to claim 1, wherein: the main transformer consists of a plurality of groups of independent windings, and each group of windings is provided with an independent rectifying circuit, a filter circuit and a load circuit.

5. A high pressure sensor test bench according to claim 4, wherein: the multiple groups of independent windings are connected in series and then form the high-voltage output end of the main transformer.

6. A high pressure sensor test bench according to claim 1, wherein: a switch protection absorption circuit and a power supply feedback circuit are connected between a collector of the IGBT tube and a first port of a primary coil of the main transformer, the switch protection absorption circuit is used for absorbing interference waves generated by the main transformer, and the power supply feedback circuit is used for stabilizing and adjusting the output of the main transformer.

7. A high pressure sensor test bench according to claim 1, wherein: be connected with switching device protection sampling circuit between the negative pole of IGBT pipe and main power supply, switching device protection sampling circuit includes protective resistor, protective resistor's one end is connected with the projecting pole of IGBT pipe and No. 3 pin of UC3842 circuit respectively, protective resistor's the other end is connected with the negative pole of main power supply.

8. A high pressure sensor test bench according to claim 1, wherein: and the main power supply is in power supply connection with the measured high-voltage sensor.

9. A high pressure sensor test bench according to claim 1, wherein: and the output ends of the second display screen and the measured high-voltage sensor are connected with a voltage conversion circuit.

10. A high pressure sensor test bench according to claim 1, wherein: and a potentiometer for adjusting the output of the main transformer is connected to the UC3842 circuit.