CN201716399U - Relay running-in aging and detection system - Google Patents

Abstract

The utility model discloses a relay running-in aging and detection system, which comprises a power supply circuit unit, a single-chip microcomputer control circuit unit and an aging/detection circuit unit. The power supply circuit unit includes a system power supply circuit I, a system power supply circuit II, a D/A conversion circuit and Power amplifying circuit, the power output terminal of the system power supply circuit I is connected with the power supply input terminal of the power amplifying circuit, and the system power supply circuit II provides chips for the single-chip microcomputer control circuit unit, aging/detection circuit unit, D/A conversion circuit and power amplifying circuit Drive power supply, the utility model overcomes the disadvantages of cumbersome operation caused by separate aging and detection of existing relays, integrates aging and detection together, realizes the integration of functions, is simple and convenient to operate, greatly improves efficiency, and at the same time Can meet the needs of a variety of industrial environments.

Description

Relay running-in aging and detection system

technical field

The utility model relates to the field of electric component detection, in particular to a relay running-in aging and detection system.

Background technique

With the increasingly obvious role of relays in industrial technology, how to conveniently and quickly detect the qualification of relays has become the focus of industrial technology. At present, the relay aging and detection technology is not yet mature, and the aging and detection devices put into production are relatively backward, and the work efficiency is low, which seriously hinders the application of relays in industrial production.

Utility model content

In view of this, the purpose of this utility model is to provide a relay break-in aging and detection system, which integrates aging and detection, realizes the integration of functions, is simple and convenient to operate, and greatly improves efficiency.

The relay running-in aging and detection system of the utility model, the relay running-in aging and detection system, is characterized in that: the relay running-in aging and detection system includes a power circuit unit, a single-chip microcomputer control circuit unit and an aging/detection circuit unit, and the power circuit The unit includes a system power supply circuit I, a system power supply circuit II, a D/A conversion circuit and a power amplifier circuit, the power supply output terminal of the system power supply circuit I is connected with the power supply input terminal of the power amplifier circuit, and the signal of the power amplifier circuit The input end is connected with the analog signal output end of the D/A conversion circuit, the digital signal input end of the D/A conversion circuit is connected with the digital signal output pin of the single-chip microcomputer control circuit unit, the power output of the power amplifier circuit The end is connected with the power input end of the burn-in/detection circuit unit;

The system power supply circuit II provides chip driving power for the single-chip microcomputer control circuit unit, aging/detection circuit unit, D/A conversion circuit and power amplifier circuit.

Further, the aging/detection circuit unit includes a relay detection bit, a first diode, a first triode, a fourth resistor and a light emitting diode, and the relay detection bit includes a first contact, a second contact, and a third contact and the fourth contact, the first contact is connected to the output terminal of the digitally controlled DC power supply of the power amplifier circuit, the second contact is connected to the collector of the first triode, and the anode of the first diode is connected to the second The contacts are connected, and its negative pole is connected with the first contact;

The third contact is connected to the 5V power supply, the fourth contact is connected to the anode of the light-emitting diode, and the cathode of the light-emitting diode is connected to the emitter of the first triode through the second resistor. The contact is grounded; the common contact of the light-emitting diode and the second resistor is connected to the signal sampling port of the single-chip microcomputer control circuit unit, and the base of the first triode is connected to the control port of the single-chip microcomputer control circuit unit;

During the test, the first contact and the second contact are connected to the control coil of the relay under test, and the third contact and the fourth contact are respectively connected to two contacts of the relay under test;

Further, the system power supply circuit I includes a transformer I, a relay switch I, a relay switch II, a second transistor, a third transistor and a rectifier bridge I, the primary winding of the transformer is connected to a 220V AC power supply, and its The secondary winding includes a 15V tap, a 10V tap, a 5V tap and a common tap, the common tap is connected to the input terminal I of the rectifier bridge 1, the 15V tap is connected to the first switch contact of the relay switch 1, and the The common contact of the relay switch I is connected with the input terminal II of the rectifier bridge I, one end of the control coil on the relay switch I is connected to the positive pole of the third diode after being grounded, and the other end is connected to the negative pole of the third diode, The common contact between the control coil and the third diode is connected to the emitter of the second triode, and the base of the second triode is connected to the control port of the single-chip microcomputer control circuit unit;

The 10V tap is connected to the first switch contact of the relay switch II, the 5V tap is connected to the second switch contact of the relay switch II, and the common contact of the relay switch II is connected to the second switch contact of the relay switch I. The switch contacts are connected, one end of the control coil on the relay switch II is grounded and connected to the positive pole of the fourth diode, and the other end is connected to the negative pole of the fourth diode, and the common contact between the control coil and the fourth diode is connected to The emitter of the third transistor is connected, and the base of the third triode is connected with the control port of the single-chip microcomputer control circuit unit;

The output terminal I of the rectifier bridge I is connected to the power supply input terminal of the power amplifier circuit, and its output terminal II is grounded, and a second capacitor and a third capacitor are connected in parallel between the output terminal I and the output terminal II;

Further, the system power supply circuit II includes a transformer II, a rectifier bridge II, a voltage regulator chip I, a voltage regulator chip II and a voltage regulator chip III, the primary winding of the transformer II is connected to a 220V AC power supply, and its secondary winding includes Positive voltage output taps, intermediate taps and negative voltage output taps, the positive voltage output taps and negative voltage output taps are respectively connected to the output terminals of the rectifier bridge II, the intermediate taps are grounded, the output terminal I of the rectifier bridge II is connected to the stable The input terminal of the voltage stabilizing chip I is connected, the output terminal of the voltage stabilizing chip I outputs +15V voltage and is connected with the input terminal of the voltage stabilizing chip II, the output terminal of the voltage stabilizing chip II outputs +5V voltage, and the The output terminal II of the rectifier bridge II is connected with the input terminal of the voltage stabilizing chip III, and the output terminal of the voltage stabilizing chip III outputs -15V voltage, and a fourth capacitor and the sixth capacitor, wherein the positive pole of the fourth capacitor is connected to the output terminal I, and its negative pole is connected to the middle tap; the fifth capacitor and the ninth capacitor are connected in parallel between the output terminal II of the rectifier bridge II and the middle tap , wherein the positive pole of the fifth capacitor is connected to the middle tap, and its negative pole is connected to the output terminal II; the eleventh capacitor and the twelfth capacitor are connected in parallel between the output terminal of the voltage stabilizing chip I and the middle tap, wherein the first The positive pole of the eleventh capacitor is connected to the output end of the voltage stabilizing chip II, and the negative pole thereof is connected to the middle tap; a thirteenth capacitor and a fourteenth capacitor are connected in parallel between the output end of the voltage stabilizing chip II and the middle tap, Wherein the positive pole of the thirteenth capacitor is connected with the output end of the voltage stabilizing chip II, and its negative pole is connected with the middle tap;

The ground terminals of the voltage stabilizing chip I, the voltage stabilizing chip II and the voltage stabilizing chip III are all connected to the center tap and grounded;

Further, the D/A conversion circuit includes a D/A conversion chip and a first operational amplifier, the digital signal input terminal of the D/A conversion chip is connected with the digital signal output pin of the single-chip microcomputer control circuit unit, and its T1 pin The pin is connected to the negative input terminal of the first operational amplifier, and one end of the T2 pin is grounded, and at the same time connected to the positive input terminal of the first operational amplifier;

The output end of the first operational amplifier is connected to the RFB pin of the D/A conversion chip, and is also connected to the signal input end of the power amplifier circuit;

Further, the power amplifying circuit includes a second operational amplifier, a first resistor, a second resistor, a third resistor, a second capacitor, a third capacitor and an NPN transistor, and the analog signal output terminal of the D/A conversion circuit passes through the first A resistance is connected with the reverse input terminal of the second operational amplifier, the positive input terminal of the second operational amplifier is grounded, and a second resistor is connected in series between the negative input terminal and the output terminal of the second operational amplifier, The output terminal of the second operational amplifier is connected to the base of the NPN transistor, the emitter of the NPN transistor is grounded through the third resistor, and the second capacitor and the third capacitor are connected in parallel with the third resistor, wherein the first The positive electrode of the second capacitor is connected with the emitter of the NPN transistor, and the common contact of the third resistor, the second capacitor and the third capacitor is the output terminal of the digitally controlled DC power supply of the power amplifier circuit;

Further, the single-chip microcomputer control circuit unit is also externally connected with a liquid crystal display device and a keyboard input device;

Further, the relay running-in aging and detection system also includes a host computer, and the single-chip control circuit unit realizes data transmission with the host computer through the RS232 communication circuit;

Further, the single-chip microcomputer control circuit unit includes a single-chip microcomputer chip HT46RU232 and its peripheral circuits.

The beneficial effects of the utility model are:

1. The existing relay aging and detection are carried out separately, the operation is cumbersome, there are many steps, and errors are prone to occur. However, this product integrates aging and detection to realize the integration of functions. The operation is simple and convenient, and at the same time greatly improves increased efficiency;

2. The utility model can be controlled by a keyboard or a computer to meet the needs of various industrial environments; the system can be used by individuals or small-scale factories, and can also be used by large electromechanical companies to put into production and use ;

3. The utility model adopts a high-power numerical control DC power supply, which can adapt to the aging and detection of various types of electromagnetic relays, such as high-current motorcycle starter relays, etc. Compared with existing products, its application range has been expanded;

4. The design of this utility model makes full use of the power-off gap when the relay is aging, and adopts time-sharing multiplexing technology, which greatly reduces the requirement for power supply capacity, thereby saving costs.

Other advantages, objectives, and features of the present utility model will be set forth in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the investigation and research below, or Can get teaching from the practice of the present utility model. The objectives and other advantages of the utility model can be realized and obtained by the following description and claims.

Description of drawings

In order to make the purpose, technical solutions and advantages of the present utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings:

Fig. 1 is each module connection schematic diagram of the present utility model;

Fig. 2 is the circuit connection diagram of system power supply circuit 1;

Fig. 3 is the circuit connection diagram of system power supply circuit II;

Fig. 4 is the circuit connection diagram of D/A conversion circuit;

Fig. 5 is the circuit connection diagram of power amplifying circuit;

Fig. 6 is the circuit connection diagram of aging/detection circuit;

7 is a circuit connection diagram of an aging/detection circuit using a time-division multiplexing architecture;

Fig. 8 is the circuit connection diagram of RS232 communication circuit;

Fig. 9 is a schematic diagram of the relay running-in aging and detection process.

Detailed ways

Preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments are only for illustrating the utility model, rather than limiting the protection scope of the utility model.

As shown in Figure 1 (the dotted line arrow in the figure is the signal control circuit, and the solid line arrow is the power supply circuit), the relay running-in aging and detection system of the present invention includes a power supply circuit unit, a single-chip microcomputer control circuit unit 1 and an aging/detection circuit unit 6 , the power circuit unit includes a system power circuit I 2, a system power circuit II 3, a D/A conversion circuit 4 and a power amplifier circuit 5, wherein the power output terminal of the system power circuit I 2 is in phase with the power input terminal of the power amplifier circuit 5 Connection, the signal input end of the power amplification circuit 5 is connected with the analog signal output end of the D/A conversion circuit 4, and the digital signal input end of the D/A conversion circuit 4 is connected with the digital signal output pin of the single-chip microcomputer control circuit unit 1 , the power output end of the power amplification circuit 5 is connected with the power input end of the aging/detection circuit unit 6;

The system power supply circuit II 3 provides chip driving power for the single-chip microcomputer control circuit unit 1, aging/detection circuit unit 6, D/A conversion circuit 4 and power amplifier circuit 5.

In order to achieve intuitive view and easy operation, the single-chip microcomputer control circuit unit 1 is also externally connected with a liquid crystal display device 8 and a keyboard input device 7 .

In this embodiment, the relay running-in aging and detection system also includes a host computer 9, and the single-chip control circuit unit 1 realizes data transmission with the host computer 9 through the RS232 communication circuit, as shown in FIG. 7 .

In this embodiment, the single-chip microcomputer control circuit unit 1 includes a single-chip microcomputer chip HT46RU232 and its peripheral circuits.

As shown in Figure 2, the system power supply circuit I 2 includes a transformer I TF1, a relay switch I K1, a relay switch II K2, a second triode Q2, a third triode Q3 and a rectifier bridge I B1, and the primary circuit of the transformer I TF1 The winding is connected with 220V AC power supply, its secondary winding includes 15V tap, 10V tap, 5V tap and common tap, the common tap is connected with the input terminal I of the rectifier bridge I B1, and the 15V tap is connected with the first switch of the relay switch I K1 The contacts are connected, the public contact of the relay switch I K1 is connected with the input terminal II of the rectifier bridge I, one end of the control coil on the relay switch I K1 is connected to the anode of the third diode D3 after being grounded, and the other end is connected to the third The cathode of the diode D3, the common contact between the control coil and the third diode D3 is connected to the emitter of the second triode Q2, and the base of the second triode Q2 is connected to the control port of the microcontroller control circuit unit 1 PA6 connected;

The 10V tap is connected to the first switch contact of the relay switch II K2, the 5V tap is connected to the second switch contact of the relay switch II K2, the common contact of the relay switch II K2 is connected to the second switch contact of the relay switch I K1 One end of the control coil on the relay switch II K2 is grounded and then connected to the positive pole of the fourth diode D4, and the other end is connected to the negative pole of the fourth diode D4. The common contact between the control coil and the fourth diode D4 is connected to The emitter of the third triode Q3 is connected, and the base of the third triode Q3 is connected with the control port PA6 of the single-chip microcomputer control circuit unit 1;

The output terminal I of the rectifier bridge I B1 is connected to the power supply input terminal of the power amplifier circuit 5, and its output terminal II is grounded, and a second capacitor C2 and a third capacitor C3 are connected in parallel between the output terminal I and the output terminal II.

As shown in Figure 3, the system power supply circuit II 3 includes a transformer II TF2, a rectifier bridge II B2, a voltage regulator chip I U2, a voltage regulator chip II U4, and a voltage regulator chip III U3. The primary winding of the transformer II TF2 is connected to the 220V AC power supply The secondary winding includes a positive voltage output tap, a middle tap and a negative voltage output tap. The positive voltage output tap and the negative voltage output tap are respectively connected to the input end of the rectifier bridge II B2, the middle tap is grounded, and the output end of the rectifier bridge II B2 I is connected with the input terminal of voltage regulator chip I U2, the output terminal of voltage regulator chip I U2 outputs +15V voltage and is connected with the input terminal of voltage regulator chip II U4, and the output terminal of voltage regulator chip II U4 outputs +5V voltage , the output terminal II of the rectifier bridge II B2 is connected with the input terminal of the voltage regulator chip III U3, the output terminal of the voltage regulator chip III U3 outputs -15V voltage, and the output terminal I of the rectifier bridge II B2 is connected in parallel with the center tap. Four capacitors C4 and the sixth capacitor C6, wherein the positive pole of the fourth capacitor C4 is connected to the output terminal I, and its negative pole is connected to the middle tap; the fifth capacitor C5 is connected in parallel between the output terminal II of the rectifier bridge II B2 and the middle tap and the ninth capacitor C9, wherein the positive pole of the fifth capacitor C5 is connected with the middle tap, and its negative pole is connected with the output terminal II; the eleventh capacitor C11 and the first capacitor C11 are connected in parallel between the output terminal of the voltage stabilizing chip I U2 and the middle tap. Twelve capacitors C12, wherein the positive pole of the eleventh capacitor C11 is connected with the output terminal of the voltage stabilizing chip II U4, and its negative pole is connected with the middle tap; the output terminal of the voltage stabilizing chip II U4 and the middle tap are connected in parallel with a tenth Three capacitors C13 and fourteenth capacitor C14, wherein the positive pole of the thirteenth capacitor C13 is connected with the output terminal of the voltage regulator chip II U4, and its negative pole is connected with the middle tap; in this circuit, the fourth capacitor C4 and the sixth capacitor C6, the fifth capacitor C5, the ninth capacitor C9, the eleventh capacitor C11, the twelfth capacitor C12, the thirteenth capacitor C13 and the fourteenth capacitor C14 mainly play a filtering role.

The ground terminals of voltage regulator chip I U2, voltage regulator chip II U4 and voltage regulator chip III U3 are all connected to the center tap and then grounded. In this embodiment, both the voltage regulator chip I U2 and the voltage regulator chip II U3 use 78L15, and the voltage regulator chip II U4 uses 78L05.

As shown in Figure 4, the D/A conversion circuit 4 includes a D/A conversion chip M1 and a first operational amplifier F1, and the digital signal input terminal of the D/A conversion chip M1 is connected to the digital signal output pin of the single-chip microcomputer control circuit unit 1. connection, its T1 pin is connected to the reverse input terminal of the first operational amplifier F1, one end of its T2 pin is grounded, and at the same time it is connected to the positive input terminal of the first operational amplifier F1;

The output end of the first operational amplifier is connected to the RFB pin of the D/A conversion chip M1 and also connected to the signal input end of the power amplifier circuit 5 . In this embodiment, the D/A conversion chip M1 adopts DAC0832.

As shown in Figure 5, the power amplifying circuit 5 includes a second operational amplifier F2, a first resistor R1, a second resistor R2, a third resistor R3, a second capacitor C2, a third capacitor C3 and an NPN transistor Q4, D/A conversion The analog signal output terminal of the circuit 4 is connected with the reverse input terminal of the second operational amplifier F2 through the first resistor R1, the positive input terminal of the second operational amplifier F2 is grounded, and the negative input terminal of the second operational amplifier F2 is connected to the output terminal of the second operational amplifier F2. A second resistor R2 is connected in series between the terminals, the output terminal of the second operational amplifier is connected to the base of the NPN transistor Q4, the emitter of the NPN transistor is grounded through the third resistor, the second capacitor C2 and the third capacitor C3 are connected to the first Three resistors R3 are connected in parallel, wherein, the anode of the second capacitor C2 is connected with the emitter of the NPN transistor Q4, and the common point of the third resistor R3, the second capacitor C2 and the third capacitor C3 is the output terminal of the digitally controlled DC power supply of the power amplifier circuit .

As shown in Figure 6, the aging/detection circuit unit 6 includes a relay detection bit (in the dotted line box), a first diode D1, a first triode Q1, a fourth resistor R4 and a light emitting diode L1, and the relay detection bit includes The first contact point P1, the second contact point P2, the third contact point P3 and the fourth contact point P4, the first contact point P1 is connected to the output terminal of the digitally controlled DC power supply of the power amplifier circuit 5, and the second contact point P2 is connected to the collector of the first triode Q1 connected, the anode of the first diode D1 is connected to the second contact P2, and its cathode is connected to the first contact P1;

The third contact P3 is connected with the 5V power supply, the fourth contact P4 is connected with the anode of the light-emitting diode L2, the cathode of the light-emitting diode L2 is connected with the emitter of the first triode Q1 through the second resistor R2, the common of the two The contact is grounded; the common contact of the light-emitting diode L2 and the second resistor R2 is connected to the signal sampling port PA3 of the single-chip control circuit unit 1, and the base of the first triode Q1 is connected to the control port PA0 of the single-chip control circuit unit 1;

During the test, the first contact P1 and the second contact P2 are connected to the control coil of the relay under test, and the third contact P3 and the fourth contact P4 are respectively connected to the two contacts of the relay under test. By detecting the level of PA3 and observing the luminescence The on-off situation of the diode can know whether the contacts of the relay are connected.

As shown in Figure 7, the burn-in/detection circuit unit 6 can also be configured as a component-time multiplexing structure, including two groups of single-group structures as shown in Figure 6, and the bases of the transistors in the two groups of structures are phased by a NOT gate 74F04. Connection, the effect of adopting this architecture is: the use of time-division multiplexing port technology can not only make full use of port resources, but also reduce the power requirements of the power supply I. Aging 1# relay when PA0 is high level; aging 2# relay when PA0 turns to low level, and its aging time distribution is adjustable, such as on 2S off 2S (on/off refers to the high/off of the microcontroller pin low level). If multiple groups of single-chip microcomputer pins are used, the number of aging relays can be increased in the same time, and the efficiency is improved.

Figure 8 is the circuit connection diagram of the RS232 communication circuit. By using VB programming and serial port communication technology, the automatic control of relay aging and detection is realized, and the operation is simpler and more convenient.

Fig. 9 is a schematic diagram of relay aging and detection process, from which it can be understood that the entire operation process of the utility model is as follows:

1. Relay aging

In the relay aging simulation working environment, let the relay continuously pull in and release within the specified time, eliminate the burrs between the contacts, make the mechanical contact more consistent, and improve the high-quality rate of the whole machine.

2. Relay detection

In view of the fact that the pull-in voltage and release voltage of the electromagnetic relay have a rated range, if the pull-in or release is within this range, it is determined that this type of relay is a qualified product, otherwise, it is concluded that this type of relay is unqualified.

During the test, within the rated operating voltage range of the relay, the digitally controlled DC power supply voltage increases (decreases) step by step. By detecting the state of PA3, it is known whether the relay contacts are closed (released), thereby judging the eligibility of the relay. When PA3 is high level, the relay pulls in; when PA3 port is low level, the relay releases.

During the relay detection period, the state of the PA3 interface is read according to a certain sampling period, and the state of the contact can be judged by the change of 0 and 1 of the read data, so that the time parameters of the relay can be obtained (pull-in time, release time) .

The system is based on single-chip microcomputer control and high-power numerical control DC power supply, and realizes the aging and detection of various relays. The system has two control schemes, one is to directly control the single-chip microcomputer through the keyboard, which is convenient and fast; the other is to realize the communication between the single-chip microcomputer and the computer through the serial port, and provide a visual interface for manual management. Select one of the control schemes, set the corresponding parameters, adjust the digital control DC power supply through the single-chip microcomputer system to meet the voltage standard of the relay to be tested, and obtain the test results through the aging and detection part of the relay, and judge the qualification of the relay by the analysis results.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present utility model without limitation. Although the utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the utility model can be Modifications or equivalent replacements of the technical solutions without departing from the spirit and scope of the technical solutions shall be covered by the claims of the present utility model.

Claims (9)

1. Relay break-in aging and detection system, it is characterized in that: described relay run-in aging and detection system comprise power circuit unit, single-chip microcomputer control circuit unit (1) and aging/detection circuit unit (6), and described power circuit unit comprises system Power supply circuit I (2), system power supply circuit II (3), D/A conversion circuit (4) and power amplification circuit (5), the power supply output terminal of the system power supply circuit I (2) and the power amplification circuit (5 ), the signal input end of the power amplification circuit (5) is connected with the analog signal output end of the D/A conversion circuit (4), and the digital signal of the D/A conversion circuit (4) The input end is connected with the digital signal output pin of the single-chip microcomputer control circuit unit (1), and the power output end of the power amplifier circuit (5) is connected with the power input end of the aging/detection circuit unit (6); The system power supply circuit II (3) provides chip driving power for the single-chip microcomputer control circuit unit (1), aging/detection circuit unit (6), D/A conversion circuit (4) and power amplifier circuit (5). 2. The relay running-in aging and detection system according to claim 1, characterized in that: the aging/detection circuit unit (6) includes a relay detection bit, a first diode (D1), a first triode ( Q1), a fourth resistor (R4) and a light emitting diode (L1), the relay detection position includes a first contact (P1), a second contact (P2), a third contact (P3) and a fourth contact (P4), The first contact point (P1) is connected to the digitally controlled DC power supply output end of the power amplifier circuit (5), the second contact point (P2) is connected to the collector of the first triode (Q1), and the first two The positive pole of the pole tube (D1) is connected to the second contact point (P2), and its negative pole is connected to the first contact point (P1); The third contact (P3) is connected to a 5V power supply, the fourth contact (P4) is connected to the anode of the light-emitting diode (L2), and the cathode of the light-emitting diode (L2) is connected to the The emitters of the first triode (Q1) are connected, and the common contact of the two is grounded; the common contact of the light-emitting diode (L2) and the second resistor (R2) is connected to the signal sampling of the single-chip microcomputer control circuit unit (1) Port (PA3), the base of the first triode (Q1) is connected to the control port (PA0) of the single-chip microcomputer control circuit unit (1); During the test, the first contact (P1) and the second contact (P2) are connected to the control coil of the relay under test, and the third contact (P3) and the fourth contact (P4) are respectively connected to the two contacts of the relay under test. head. 3. The relay running-in aging and detection system according to claim 1, characterized in that: the system power supply circuit I (2) includes a transformer I (TF1), a relay switch I (K1), a relay switch II (K2), The second transistor (Q2), the third transistor (Q3) and the rectifier bridge I, the primary winding of the transformer I (TF1) is connected with the 220V AC power supply, and its secondary winding includes a 15V tap, a 10V tap and A 5V tap and a common tap, the common tap is connected to the input terminal I of the rectifier bridge I, the 15V tap is connected to the first switch contact of the relay switch I (K1), and the relay switch I (K1) The common contact is connected with the input terminal II of the rectifier bridge I, and one end of the control coil on the relay switch I (K1) is connected to the positive pole of the third diode (D3) after being grounded, and the other end is connected with the third diode ( The negative pole of D3), the common contact of the control coil and the third diode (D3) is connected with the emitter of the second triode (Q2), and the base of the second triode (Q2) is connected with the microcontroller control The control port (PA6) of the circuit unit (1) is connected; The 10V tap is connected to the first switch contact of the relay switch II (K2), the 5V tap is connected to the second switch contact of the relay switch II (K2), and the common The contact is connected with the second switch contact of the relay switch I (K1), and one end of the control coil on the relay switch II (K2) is grounded and then connected to the anode of the fourth diode (D4), and the other end is connected to the fourth The cathode of the diode (D4), the common junction of the control coil and the fourth diode (D4) is connected to the emitter of the third transistor (Q3), and the base of the third transistor (Q3) Pole is connected with the control port (PA6) of the single-chip microcomputer control circuit unit (1); The output terminal I of the rectifier bridge I is connected to the power supply input terminal of the power amplification circuit (5), and its output terminal II is grounded, and a second capacitor (C2) and a third capacitor are connected in parallel between the output terminal I and the output terminal II (C3). 4. The relay running-in aging and detection system according to claim 1, 2 or 3, characterized in that: the system power supply circuit II (3) includes a transformer II (TF2), a rectifier bridge II, a voltage regulator chip I (U2 ), voltage regulator chip II (U4) and voltage regulator chip III (U3), the primary winding of the transformer II (TF2) is connected to the 220V AC power supply, and its secondary winding includes a positive voltage output tap, an intermediate tap and a negative voltage Output taps, the positive voltage output taps and negative voltage output taps are respectively connected to the input terminals of the rectifier bridge II, the middle tap is grounded, and the output terminal I of the rectifier bridge II is connected to the input terminal of the voltage stabilizing chip I (U2). connected, the output terminal of the voltage stabilizing chip I (U2) outputs +15V voltage and is connected with the input terminal of the voltage stabilizing chip II (U4), and the output terminal of the voltage stabilizing chip II (U4) outputs +5V voltage, The output terminal II of the rectifier bridge II is connected with the input terminal of the voltage stabilizing chip III (U3), and the output terminal of the voltage stabilizing chip III (U3) outputs -15V voltage, and the output terminal I of the rectifier bridge II is connected to the input terminal of the voltage stabilizing chip III (U3). A fourth capacitor (C4) and a sixth capacitor (C6) are connected in parallel between the center taps, wherein the positive pole of the fourth capacitor (C4) is connected to the output terminal I, and its negative pole is connected to the center tap; the rectifier bridge II A fifth capacitor (C5) and a ninth capacitor (C9) are connected in parallel between the output terminal II and the middle tap, wherein the positive pole of the fifth capacitor (C5) is connected to the middle tap, and its negative pole is connected to the output terminal II; The eleventh capacitor (C11) and the twelfth capacitor (C12) are connected in parallel between the output terminal of the voltage stabilizing chip I (U2) and the middle tap, wherein the positive electrode of the eleventh capacitor (C11) is connected to the positive electrode of the voltage stabilizing chip II (U4 ) is connected to the output terminal, and its negative pole is connected to the middle tap; the thirteenth capacitor (C13) and the fourteenth capacitor (C14) are connected in parallel between the output terminal of the voltage stabilizing chip II (U4) and the middle tap. , wherein the positive pole of the thirteenth capacitor (C13) is connected with the output terminal of the voltage regulator chip II (U4), and its negative pole is connected with the center tap; The ground terminals of the voltage stabilizing chip I ( U2 ), voltage stabilizing chip II ( U4 ) and voltage stabilizing chip III ( U3 ) are all connected to the center tap and grounded. 5. The relay running-in aging and detection system according to claim 1, characterized in that: the D/A conversion circuit (4) includes a D/A conversion chip and a first operational amplifier, and the D/A conversion chip The digital signal input terminal is connected with the digital signal output pin of the single-chip microcomputer control circuit unit (1), its T1 pin is connected with the reverse input terminal of the first operational amplifier, and one end of its T2 pin is grounded, and at the same time it is connected with the first operational amplifier Positive input; The output end of the first operational amplifier is connected to the RFB pin of the D/A conversion chip, and is also connected to the signal input end of the power amplification circuit (5). 6. The relay wear-in aging and detection system according to claim 1, characterized in that: the power amplifying circuit (5) includes a second operational amplifier, a first resistor (R1), a second resistor (R2), a third Resistor (R3), second capacitor (C2), third capacitor (C3) and NPN triode (Q4), the analog signal output terminal of the D/A conversion circuit (4) is connected with the second resistor (R1) through the first resistor (R1) The reverse input terminals of the operational amplifier are connected, the positive input terminal of the second operational amplifier is grounded, and a second resistor (R2) is connected in series between the negative input terminal and the output terminal of the second operational amplifier. The output terminal of the second operational amplifier is connected with the base of the NPN transistor (Q4), the emitter of the NPN transistor (Q4) is grounded through the third resistor, and the second capacitor (C2) and the third capacitor (C3) They are all connected in parallel with the third resistor (R3), wherein, the anode of the second capacitor (C2) is connected with the emitter of the NPN transistor (Q4), the third resistor (R3), the second capacitor (C2) and the third The common point of the capacitor (C3) is the output terminal of the digitally controlled DC power supply of the power amplifier circuit. 7. The relay wear-in aging and detection system according to claim 1, characterized in that: the single-chip microcomputer control circuit unit (1) is also externally connected with a liquid crystal display device (8) and a keyboard input device (7). 8. The relay running-in aging and detection system according to claim 1, characterized in that: the relay running-in aging and detection system also includes a host computer (9), and the single-chip control circuit unit (1) communicates with The upper computer (9) realizes data transmission. 9. The relay wear-in aging and detection system according to claim 1, characterized in that: the single-chip microcomputer control circuit unit (1) includes a single-chip microcomputer chip HT46RU232 and its peripheral circuits.

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