CN203825151U - Multifunctional portable thyristor tester - Google Patents

Abstract

The utility model discloses a multifunctional portable thyristor tester, and the tester comprises an insulating housing and a detection circuit. The detection circuit is formed by the sequential series connection of an indicator light a, a direct-current power supply, a single-pole double-throw switch, and a 51-Ohm resistor. The direct-current power supply and the indicator light a are in parallel connection with an alternating-current power-supply series circuit. A to-be-detected thyristor is detected through the arrangement of a detection pen. The tester provided by the utility model is simple in wiring, is convenient and quick in operation, is visual in determination, is small in size of a complete machine, is convenient to carry, can achieve the periodic detection of the thyristor, is low in cost of equipment, is huge in market potential, and is worthy of popularization and application.

Description

A Multifunctional and Portable Thyristor Tester

technical field

The utility model belongs to the technical field of thyristor performance detection, in particular to a multifunctional and portable thyristor tester.

Background technique

Thyristors are widely used in rectification equipment in electric power and other industries due to their advantages such as high withstand voltage, large capacity, and small size. The application of the thyristor is gradually expanding, and more and more users have put forward higher requirements for the reliability of the thyristor device, so it is necessary to be able to quickly and simply detect the reliability of the thyristor. The main content of the measurement is whether the thyristor is intact and its performance parameter di /dt.

The traditional method of testing the integrity of thyristors is to use a multimeter to test. During the test, a dry battery needs to be connected in series with the black pen of the multimeter to increase the trigger voltage.

di/dt is an important parameter for the reliability of the thyristor. If the value is too high, the thyristor will be turned on and burnt. Although the thyristor will be given a di/dt parameter when it leaves the factory, the thyristor will be damaged after a period of use and cannot be guaranteed. Long-term reliability with timely adjustments. However, the existing test methods require specialized equipment for measurement, or use complex and high-cost circuits, so a low-cost and easy-to-use test device is designed.

Utility model content

The purpose of this utility model is to provide a multi-functional portable thyristor tester in order to make up for the deficiencies of the prior art. Detection, equipment cost is low, the market potential is huge, and it is worth widely popularizing and applying.

The technical scheme adopted for realizing the purpose of this utility model is:

The utility model provides a multifunctional and portable thyristor tester, which includes an insulating shell and a detection circuit. The detection circuit is to connect an indicator light a, a DC power supply, a single-pole double-throw switch and a 51Ω resistor in series. The 51Ω resistor is connected to the A yellow wire is drawn between the SPDT switches, and a red wire is drawn from the other end. One end of the indicator light a is connected to a DC power supply, and a black wire is provided at the other end. The red, yellow, and black wires are respectively led out of the insulating shell, and then connection detection pen;

The DC power supply and the indicator light a are connected in parallel with the AC power series circuit, and the AC power supply series circuit is connected in series with the indicator light b, the AC power supply, and the parallel resistor in turn, and the parallel resistor is a sliding rheostat connected in parallel with the resistor; through the single pole double Throw switch to choose to use DC power supply or AC power supply;

The a and b in the indicator light a and the indicator light b are only for distinguishing the installation positions, and have the same nature.

The testing method of the multifunctional portable thyristor tester comprises the following steps:

①Integrity detection: Select the DC power supply through the SPDT switch, first connect the red line and black line of the tester to the anode and cathode of the thyristor to be tested respectively, and leave the yellow line unconnected; if the indicator a lights up at this time, it is detected The test thyristor is bad; if the indicator a does not light up, touch the yellow line to the control pole of the thyristor to be tested for a moment and leave immediately, and the indicator a keeps lighting, then the component is good. If the indicator light a still does not light up after connecting the control pole in an instant, or it only lights up when the yellow line is connected, and then goes out immediately after the yellow line leaves, indicating that the component is bad.

②di/dt parameter detection: Select the AC power supply through the single pole double throw switch, adjust the resistance value of the sliding rheostat to obtain the required current, connect the red line and black line of the tester to the anode and cathode of the thyristor to be tested respectively, and connect the yellow line to the thyristor to be tested. The line touches the control terminal of the thyristor to be tested for a moment and then leaves, the indicator light b lights up when touched, and goes out after a short while after leaving, indicating that the thyristor to be tested can withstand the set current and touch time, that is, it reaches the required value. di/dt, the product is qualified.

In step ① of the test method, as a basis for further judging the integrity, its conduction characteristics can be judged by observing the brightness and darkness of the indicator light a. When the thyristor is triggered to conduct, the brightness of the indicator light and the anode and cathode When the two wires are short-circuited, the brightness is the same, indicating that its forward characteristics are very good; if it is dark, it indicates that its forward conduction characteristics are poor.

The DC power supply is 3V-5V, and the AC power supply is preferably 30V-40V, 50Hz sine wave; in the step ② of the test method, the required current is the contact time and the di/dt required by the thyristor to be tested. product of parameter values;

The time for each touch in step ② is 3s.

In the thyristor tester of the utility model, the DC power supply is 3V-5V, and the AC power supply is preferably 30V-40V, 50Hz sine wave, which reduces the turn-on and turn-off time, and the time of each touch is 3s, which can effectively reduce the error; in the detection circuit , the selection of 51Ω resistance can ensure the correct triggering, prolong the pulse time on the thyristor, and reduce the damage to the thyristor caused by the instantaneous voltage during the test;

The utility model has the advantages of simple wiring, convenient operation, intuitive discrimination, small size of the whole machine, convenient portability, periodic detection of thyristors, low equipment cost and huge market potential, and is worthy of wide popularization and application.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described:

Fig. 1 is a structural diagram of a multifunctional portable thyristor tester of the present invention.

Detailed ways

Example

As shown in Figure 1, the multifunctional portable thyristor tester provided by the utility model includes an insulating shell and a detection circuit, and the detection circuit is an indicator light a (L1), a direct current power supply (DC), a single-pole double-throw switch ( S) and a 51Ω resistor (R1) are connected in series in sequence, a yellow line is drawn between the 51Ω resistor (R1) and the SPDT switch (S), and a red pen line is drawn from the other end, and one end of the indicator light a (L1) It is connected with a DC power supply (DC), and the other end is provided with a black wire. The red, yellow, and black wires are respectively led out of the insulating shell, and then connected to the detection pen, which is the pen line of the detection pen;

The DC power supply (DC) and the indicator light a (L1) are connected in parallel with the AC power supply (AC) series circuit, and the AC power supply (AC) series circuit is connected in series with the indicator light b (L2), the AC power supply (AC), and the parallel resistor , the parallel resistance is that the sliding rheostat (R2) is connected in parallel with the resistance (R3);

Select to use DC power supply (DC) or AC power supply (AC) through the single-pole double-throw switch (S); the a and b in the indicator light a (L1) and indicator light b (L2) are only for distinguishing the installation position , with the same nature.

The testing method of the multifunctional portable thyristor tester comprises the following steps:

① Integrity detection: Use the DC power supply (DC) through the single-pole double-throw switch (S), select the DC power supply (DC) from 3V to 5V, first connect the red line and black line of the tester to the anode and cathode of the thyristor to be tested respectively , the yellow wire is not connected; if the indicator light a (L1) lights up at this time, the thyristor under test is broken; if the indicator light a (L1) does not light up, touch the yellow line to the control pole of the thyristor under test for a moment and leave immediately , the indicator light a (L1) keeps glowing, then the component is good. If the indicator light a (L1) still does not light up after connecting the control pole in an instant, or it only lights up when the yellow line is connected, and then goes out immediately after the yellow line leaves, indicating that the component is bad.

Further determine the integrity: By observing the brightness of the indicator light a (L1), its conduction characteristics can be judged. When the thyristor is triggered to conduct, the brightness of the indicator light a (L1) is short-circuited The brightness is the same, indicating that its forward characteristics are very good; if it is darker, it indicates that its forward conduction characteristics are poor.

②di/dt parameter detection: Select the AC power supply (AC) through the single-pole double-throw switch (S). The AC power supply (AC) preferably chooses 30V~40V, 50Hz sine wave; Connect the red wire and black wire of the tester to the anode and cathode of the thyristor to be tested respectively, touch the yellow wire to the control pole of the thyristor to be tested for 3 seconds and then leave. After a while, it goes out, indicating that the thyristor under test can withstand the set current and contact time, that is, the required di/dt is reached, and the product is qualified.

The required current is the product of the touch time and the di/dt parameter value required by the thyristor to be tested; in the process of use, the di/dt parameter value required by the thyristor to be tested is recommended to be achieved according to the circuit requirements of the thyristor. The di/dt parameter value plus some margin is the di/dt value generated in the thyristor after the circuit is turned on.

Claims (2)

1. a Multi-functional portable thyristor tester, comprises insulation crust and detection line, it is characterized in that:

Described detection line is that pilot lamp a, direct supply, single-pole double-throw switch (SPDT) and 51 resistance are connected successively, between described 51 resistance and described single-pole double-throw switch (SPDT), draw yellow line, the other end is drawn red line, described pilot lamp a one end is connected with direct supply, the other end arranges black line, described red, yellow, black 3 lines are drawn outside insulation crust respectively, then connect detecting pen;

Described direct supply and pilot lamp a are in parallel with AC power series circuit, and described AC power series circuit is indicating lights connected in series b, AC power, parallel resistance successively, and described parallel resistance is that slide rheostat is in parallel with a resistor;

By described single-pole double-throw switch (SPDT) choice for use direct supply or use AC power.

2. a kind of Multi-functional portable thyristor tester as claimed in claim 1, is characterized in that: described direct supply is selected 3V ~ 5V, and it is sinusoidal wave that AC power is preferably selected 30V ~ 40V, 50Hz.