CN103630818A - Multifunctional portable thyristor tester and test method thereof - Google Patents

Abstract

The invention discloses a multifunctional and portable thyristor tester and a testing method thereof, which include an insulating shell and a detection circuit. And the indicator light a is connected in parallel with the AC power supply series circuit. The test method is to detect the integrity detection and di/dt parameter detection of the thyristor to be tested by setting the connection detection pen. The tester of the present invention is simple in wiring, convenient in operation, intuitive in discrimination, and complete The device is small in size, easy to carry, can realize regular detection of thyristors, has low equipment cost and huge market potential, and is worthy of wide popularization and application.

Description

A multifunctional portable thyristor tester and its testing method

technical field

The invention belongs to the technical field of thyristor performance detection, and in particular relates to a multifunctional and portable thyristor tester and a testing method thereof.

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.

Contents of the invention

The object of the present invention is to make up for the deficiencies of the prior art, and provide a multifunctional portable thyristor tester and its testing method. Regular testing of thyristors has low equipment cost and huge market potential, and is worthy of widespread promotion and application.

The technical scheme adopted for realizing the purpose of the present invention is:

The present invention provides a multi-functional portable thyristor tester, which includes an insulating shell and a detection line, the detection line is to connect the indicator light a, a DC power supply, a single-pole double-throw switch and a 51Ω resistor in series, and the 51Ω resistor is connected to the The yellow wire is led out from the SPDT switch, and the red wire is led out from the other end. One end of the indicator light a is connected to the DC power supply, and a black wire is set at the other end. The red, yellow, and black wires are respectively led out of the insulating shell, 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 a parallel resistor in turn, and the parallel resistor is a sliding rheostat connected in parallel with the resistor;

Selecting to use DC power or AC power through the single-pole-double-throw switch;

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 light 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, the conduction characteristics of the indicator light a can be judged by observing the brightness and darkness of the indicator light a. 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 step ② of the test method, the required current is the product of the touch time and the di/dt parameter value required by the thyristor to be tested;

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

In the thyristor tester of the present invention, 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 of the thyristor, and reduce the damage to the thyristor caused by the instantaneous voltage during the test;

The invention 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 present invention will be 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 present invention includes an insulating casing 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) 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) is connected to The DC power supply (DC) is connected, 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 resistance , the parallel resistor is to connect the sliding rheostat (R2) and the resistor (R3) in parallel;

Select to use direct current power (DC) or use alternating current power (AC) through said single pole double throw switch (S);

The a and b in the indicator light a ( L1 ) and the indicator light b ( L2 ) 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 (DC) through the single-pole double-throw switch (S), select the DC power supply (DC) 3V~5V, first connect the red line and the 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 and darkness of the indicator light a (L1), you can judge its conduction characteristics. 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). 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 to be tested 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 that the thyristor to be tested needs to achieve, it is recommended that the di/dt parameter value achieved by the thyristor according to the circuit requirements plus some affluence, as the di/dt value generated in the thyristor after the circuit is turned on .

Claims (5)

1. A multifunctional portable thyristor tester, comprising an insulating shell and a detection circuit, is characterized in that: The detection circuit is to connect the indicator light a, the DC power supply, the SPDT switch and the 51Ω resistor in series in sequence, a yellow line is drawn between the 51Ω resistor and the SPDT switch, and a red line is drawn from the other end, and the indicator light a One end is connected to the DC power supply, and the other end is provided with a black wire, and the three red, yellow, and black wires are respectively led out of the insulating shell, and then connected to the 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 a parallel resistor in turn, and the parallel resistor is a sliding rheostat connected in parallel with the resistor; The DC power supply or the AC power supply is selected through the single pole double throw switch. 2. a kind of testing method of multifunctional portable thyristor tester as claimed in claim 1, is characterized in that, Include 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 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. 3. A multifunctional portable thyristor tester as claimed in claim 1, characterized in that: The DC power supply is 3V~5V, and the AC power supply is preferably 30V~40V, 50HZ sine wave. 4. the testing method of a kind of multifunctional portable thyristor tester as claimed in claim 2, is characterized in that: In step ① of the test method, as a basis for further judging the integrity, the conduction characteristics of the indicator light a can be judged by observing the brightness and darkness of the indicator light a. 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. 5. the testing method of a kind of multifunctional portable thyristor tester as claimed in claim 2, is characterized in that: In step ② of the test method, the required current is the product of the touch time and the di/dt parameter value required by the thyristor to be tested; The time for each touch in step ② is 3s.

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