Zero-power-consumption starter technical parameter test system and test method

Abstract

The invention relates to a zero-power-consumption starter technical parameter testing system and testing method, and belongs to the technical field of testing. A programmable logic controller (PLC) is connected with a human-computer interface MT, a voltage automatic adjusting device VT, a voltage sensor BU0, a resistance switching module RL1, a resistance switching module RL2, a relay K0, a current sensor BI1, a voltage sensor BU1, a current sensor BI2 and a voltage sensor BU2. The automatic voltage adjusting device VT is connected with the voltage sensor BU0, the resistance switching module RL1, the resistance switching module RL2, the voltage sensor BU1, the voltage sensor BU2 and the zero-power-consumption starter LQD, and the relay K0 is connected with the resistance switching module RL1, the resistance switching module RL2, the current sensor BI1, the voltage sensor BU1, the current sensor BI2, the voltage sensor BU2 and the zero-power-consumption starter LQD.

Description

Technical Field

[0001] The invention relates to a zero-power starter technical parameter testing system and testing method, belonging to the technical field of testing. Background Art

[0002] Zero power consumption starter is the starting element of fixed frequency compressor. Its working principle is as follows: Figure 2 At present, most fixed-frequency compressors use single-phase asynchronous motors, which are composed of main winding and auxiliary winding. Pin 6-pin 7 of the zero-power starter is connected in series to the main winding circuit of the motor, and its pin 5-pin 7 is connected in series to the auxiliary winding circuit of the motor. When the motor starts, the current of the main winding circuit is large, that is, the current between pin 6-pin 7 of the zero-power starter LQD is large, and the pin 5-pin 7 of the zero-power starter LQD is controlled to be turned on, and the auxiliary winding circuit of the motor is turned on. The positive temperature coefficient thermistor PTC participates in the motor starting. When the motor is started, it is in the running state. The running current of the main winding of the motor is small (compared to the starting current). Initial current), control the pin 5-pin 7 of the zero-power starter LQD to shut down, thereby completely shutting off the secondary winding circuit and eliminating the tiny power consumption (about 3W) after the positive temperature coefficient thermistor PTC is started, achieving the effect of a zero-power starter. If there is an error in parameter matching, the current in the main winding circuit cannot trigger the conduction of the secondary winding circuit at the beginning of power-on, which will cause the motor to fail to start normally. Similarly, if the current in the main winding circuit cannot shut off the secondary winding circuit after starting, the motor will not operate normally. Therefore, the technical performance parameters of the zero-power starter will directly affect whether the motor can work normally.

[0003] In the actual production and use of zero-power starters, it is necessary to test the technical parameters of zero-power starters that affect the starting performance of motors. The test items include trigger current, action time, on-current, off-current, and power consumption.

[0004] At present, the test systems for testing these technical parameters generally have a low degree of automation. The test principles are as follows: Figure 3, including an adjustable power supply VT, a No. 1 adjustable resistor RL1, a No. 2 adjustable resistor RL2, a current sensing probe TA, an oscilloscope OS, a No. 1 electrical parameter table W1, a No. 2 electrical parameter table W2, and a zero-power starter LQD, wherein the V1 terminal and the V2 terminal of the adjustable power supply VT are respectively connected to the L terminal and the N terminal of the mains; the V3 terminal is connected to the connected end of the No. 1 adjustable resistor RL1 and the No. 2 adjustable resistor RL2, and the V4 terminal is respectively connected to the 7 terminal of the zero-power starter LQD, the U2 terminal of the No. 1 electrical parameter table W1, and the U2 terminal of the No. 2 electrical parameter table W2. The other end of the No. 1 adjustable resistor RL1 is connected to the I1 end of the No. 1 electrical parameter meter W1, the other end of the No. 2 adjustable resistor RL2 is connected to the I1 end of the No. 2 electrical parameter meter W2, the connecting line passes through the sensing hole of the current sensing probe TA, the current sensing probe TA is connected to the oscilloscope OS, the 6th end of the zero-power starter LQD is respectively connected to the I2 end and the U1 end of the No. 1 electrical parameter meter W1, and the 5th end of the zero-power starter LQD is respectively connected to the I2 end and the U1 end of the No. 2 electrical parameter meter W2.

[0005] Testing process: S1. Adjust the resistance of adjustable resistor RL1 to the maximum value to ensure that after the test voltage is turned on, the test circuit No. 1 connected in series at terminals 6-7 in the zero-power starter LQD cannot trigger the test circuit No. 2 connected in series at terminals 5-7 to be turned on.

[0006] S2. Adjust the resistance of the second adjustable resistor RL2 to the specified value so that the test current of the second test circuit meets the test technical requirements.

[0007] S3. Adjust the adjustable power supply VT to adjust the test voltage to the specified value that meets the test technical requirements.

[0008] S4. Slowly reduce the No. 1 adjustable resistor RL1 to slowly increase the current in the No. 1 test loop. At the same time, observe whether there is a current value in the No. 2 electrical parameter table W2. When a stable current value appears and is greater than the on-current judgment value, stop adjusting the No. 1 adjustable resistor RL1. Record the current in the No. 1 electrical parameter table W1 at this time, which is the trigger current of the zero-power starter LQD.

[0009] S5. Maintain the S4 test step status and read the time when the oscilloscope OS current waveform drops from the maximum current to 1 / 2 of the maximum current value. This time is the action time of the zero-power starter LQD.

[0010] S5. Maintain the S4 test step status, compare the read trigger current value with the on-current value of the technical requirements, if the trigger current value is greater than the on-current value, the on-current test item fails, otherwise, continue to increase the current of the No. 1 test loop to the on-current value by adjusting the No. 1 adjustable resistor RL1, observe the current value of the No. 2 electrical parameter table W2, if the No. 2 test loop always maintains the current-passing state, the on-current test item passes.

[0011] S6. Slowly increase the No. 1 adjustable resistor RL1 to slowly reduce the No. 1 test loop current to the disconnecting current required by the technology. By observing the current value of No. 2 electrical parameter table W2, if the current value is less than the disconnecting current judgment value, the disconnecting current test item is qualified, otherwise it is unqualified.

[0012] S7. Maintain the state of the S6 test step, read the power consumption values ​​of the No. 1 electrical parameter table W1 and the No. 2 electrical parameter table W2 respectively, and add the two power consumption values ​​to obtain the power consumption of the zero-power starter LQD.

[0013] S8. Compare and judge the trigger current value, action time value, and power consumption value read in the test with the limit range of technical requirements, and combine the qualified status of the on-current test items and the off-current test items judged during the test. If the above test items are all within the qualified range, it means that the technical parameters of the zero-power starter LQD are qualified.

[0014] The existing test system has the following disadvantages: first, the adjustment of the test voltage and the adjustment of the adjustable resistor (indirect adjustment of the loop current) both use mechanical adjustment devices, which have problems with mechanical contact performance; second, the adjusted test voltage and current do not have ready-made closed-loop control, and the human deviation of manual adjustment, the poor contact of the adjustment device and the fluctuation of the electrical parameters caused by the power grid fluctuation cannot be detected and controlled in real time, and the accuracy and stability of the test system cannot be guaranteed; third, the reading, calculation and comparison of the test data are performed manually by the operator, which has the defects of large human factors in the test process, low work efficiency and low credibility of the test data. Summary of the invention

[0015] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a zero-power starter technical parameter testing system and testing method with reasonable structural design, small test error and high degree of automation.

[0016] The technical solution adopted by the present invention to solve the above-mentioned problem is: the zero-power starter technical parameter testing system, the testing system is used to test the technical parameters of the zero-power starter LQD, the testing system includes a programmable controller PLC, a human-machine interface MT and a voltage automatic regulating device VT, and its structural characteristics are: it also includes a voltage sensor BU0, a resistance switching module RL1, a resistance switching module RL2, a relay K0, a current sensor BI1, a current sensor BI2, a voltage sensor BU1 and a voltage sensor BU2, the programmable controller PLC is respectively connected to the human-machine interface MT, the voltage automatic regulating device VT, the voltage sensor BU0 , the resistance switching module RL1, the resistance switching module RL2, the relay K0, the current sensor BI1, the voltage sensor BU1, the current sensor BI2 and the voltage sensor BU2 are connected, the voltage automatic regulating device VT is respectively connected to the voltage sensor BU0, the resistance switching module RL1, the resistance switching module RL2, the voltage sensor BU1, the voltage sensor BU2 and the zero power starter LQD, the relay K0 is respectively connected to the resistance switching module RL1, the resistance switching module RL2, the current sensor BI1, the voltage sensor BU1, the current sensor BI2, the voltage sensor BU2 and the zero power starter LQD; The resistance switching module RL1 includes a relay K1, a relay K2, a relay K3, a relay K4, a relay K5, a relay K6, a power resistor R1, a power resistor R2, a power resistor R3, a power resistor R4, a power resistor R5 and a power resistor R6. In the resistance switching module RL1, ends 1 and 2 of the contacts of the relay K1, the relay K2, the relay K3, the relay K4, the relay K5 and the relay K6 are respectively connected to the two ends of the power resistor R1, the power resistor R2, the power resistor R3, the power resistor R4, the power resistor R5 and the power resistor R6 to form 6 parallel combinations, which are then connected in series in sequence. The control A ends of the relay K1, the relay K2, the relay K3, the relay K4, the relay K5 and the relay K6 are connected and then connected to the V+ end of the DC power supply. The resistance switching module RL2 includes a relay K7, a relay K8, a relay K9, a relay KA, a relay KB, a relay KC, a relay KD, a relay KE, a relay KF, a power resistor R7, a power resistor R8, a power resistor R9, a power resistor RA, a power resistor RB, a power resistor RC, a power resistor RD, a power resistor RE and a power resistor RF. In the resistance switching module RL2, the contacts of relays K7, K8, K9, KA, KB, KC, KD, KE and KF are connected to the two ends of power resistors R7, R8, R9, RA, RB, RC, RD, RE and RF respectively to form 9 parallel combinations, which are then connected in series in sequence. The control A ends of relays K7, K8, K9, KA, KB, KC, KD, KE and KF are connected and then connected to the V+ end of the DC power supply. The programmable controller PLC includes a central processing unit CPU, a digital-to-analog conversion module DA, an eight-channel analog-to-digital conversion module AD8, an output module OUT and a serial communication interface RS232. The central processing unit CPU is respectively connected to the digital-to-analog conversion module DA, the eight-channel analog-to-digital conversion module AD8, the output module OUT and the serial communication interface RS232. The + end and the - end of the digital-to-analog conversion module DA are respectively connected to the U+ end and the U- end of the voltage automatic regulating device VT. The + end and the - end of channel zero CH0 in the eight-channel analog-to-digital conversion module AD8 are respectively connected to the U+ end and the U- end of the voltage sensor BU0, the + end and the - end of channel one CH1 are respectively connected to the U+ end and the U- end of the current sensor BI1, and the + end and the - end of channel two CH1 are respectively connected to the U+ end and the U- end of the current sensor BI1. The + and - ends of H2 are respectively connected to the U+ and U- ends of the voltage sensor BU1, the + and - ends of the channel three CH3 are respectively connected to the U+ and U- ends of the current sensor BI2, and the + and - ends of the channel four CH4 are respectively connected to the U+ and U- ends of the voltage sensor BU2, the COM end in the output module OUT is connected to the V- end of the DC power supply, the Y0 end is connected to the B end of the relay K0, the Y1 end...Y6 end is respectively connected to the B end of the relay K1...relay K6 in the resistance switching module RL1, and the Y7 end...YF end is respectively connected to the B end of the relay K7...relay KF in the resistance switching module RL2, and the serial communication interface RS232 is connected to the human-machine interface MT through a data line to realize two-way data communication; The L end and N end of the mains are connected to the V1 end and V2 end of the automatic voltage regulator VT respectively, the V3 end of the automatic voltage regulator VT is connected to the U1 end of the voltage sensor BU0, and is connected to the connecting end of the contact 1 of the relay K1 and the power resistor R1, and is then connected to the connecting end of the contact 1 of the relay K7 and the power resistor R7, the contact 2 end of the relay K6 and the connecting end of the power resistor R6 are connected to the contact 1 end of the relay K0, the contact 2 end of the relay K0 is connected to the U1 end of the voltage sensor BU1 and the fifth pin LQD5 of the zero-power starter LQD respectively, and the connected wires pass through the sensing hole of the current sensor BI1; The contact 2 end of the relay KF and the connection end of the power resistor RF are connected to the contact 3 end of the relay K0, and the contact 4 end of the relay K0 is respectively connected to the U1 end of the voltage sensor BU2 and the sixth pin LQD6 of the zero-power starter LQD, and the connected wires pass through the sensing hole of the current sensor BI2, and the control A end of the relay K0 is connected to the V+ end of the DC power supply; The V4 end of the voltage automatic regulating device VT is respectively connected to the seventh pin LQD7 of the zero-power starter LQD, the U2 end of the voltage sensor BU0, the U2 end of the voltage sensor BU1, and the U2 end of the voltage sensor BU2.

[0017] Furthermore, another technical purpose of the present invention is to provide a testing method for a zero-power starter technical parameter testing system.

[0018] The above technical objectives of the present invention are achieved through the following technical solutions.

[0019] A method for testing a technical parameter test system of a zero power starter, the method is used to test the trigger current I of the zero power starter LQD c , action time S d , conduction current I 2t , disconnect current I 2d , power consumption W LQD The technical parameters are tested, and its characteristics are: The test method is as follows: parameter setting: set the specified parameters on the human-machine interface MT, and the test conditions include the test voltage U, the PTC constant temperature resistance R p , No. 1 circuit current regulating resistor R L1 , starting current I q , speed-up rate V U , deceleration rate V d , technical requirements include minimum trigger current I cmin , Maximum trigger current I cmax , minimum action time S dmin , Maximum action time S dmax , Maximum power consumption W max , conduction current I 2t , conduction judgment current I 1t , disconnect current I 2d , Disconnection judgment current I 1d .

[0020] Furthermore, the trigger current I cTest: Connect the zero-power starter LQD to the test system, press the "test start" button on the human-machine interface MT, and the test system will first test the trigger current project. The programmable controller PLC will adjust the voltage according to the test voltage U set by the human-machine interface MT. The central processing unit CPU→digital-to-analog conversion module DA outputs an analog DC voltage to control the voltage automatic adjustment device VT to adjust the voltage. At the same time, the voltage sensor BU0 samples the adjusted voltage, converts it into a DC analog signal, and then inputs it into the zeroth channel CH0 of the eight-channel analog-to-digital conversion module AD8, and converts it into a digital signal and inputs it into the central processing unit CPU. If the test voltage U has been adjusted to the specified value, the voltage adjustment is completed; similarly, according to the No. 1 loop current regulating resistor R set by the human-machine interface MT L1 The output module OUT's Y1...Y6 terminals control relays K1...K6 to switch the resistors, making the No. 1 loop current regulating resistor R L1 Reach the required value; Similarly, according to the test voltage U and starting current I set by the human-machine interface MT q via U / I q Calculate the current regulating resistance R of the second circuit L2 Then, the Y7 terminal...YF terminal of the output module OUT controls the relay K7...relay KF to switch the resistance, and adjust the second loop current I2 to the starting current I q Then, the Y0 terminal of the output module OUT controls the relay K0 to operate, and the zero-power starter LQD is connected to the test voltage U. Then, the resistance switching of the relay K7...relay KF is controlled through the Y7...YF terminal of the output module OUT to make the current of the second circuit increase at the set speed rate V U The CPU obtains the change of the current I2 of the second loop through the current sensor BI2 → the channel 3 CH3 of the eight-channel analog-to-digital conversion module AD8. When the current I2 of the second loop rises to a certain current, the current between the sixth pin LQD6 and the seventh pin LQD7 of the zero-power starter LQD connected in series in the second loop controls the fifth pin LQD5 to the seventh pin LQD7 to be turned on. At the same time, the CPU obtains the change of the current I1 of the first loop through the current sensor BI1 → the channel 1 CH1 of the eight-channel analog-to-digital conversion module AD8. When the current I1 of the first loop is greater than the conduction judgment current I 1t When the Y7-YF terminal of the output module OUT controls the relay K7-KF to stop the resistance switching, the current rising process of the second circuit stops, and the programmable controller PLC automatically records the current I2 of the second circuit at this time, which is the trigger current I c , and at the same time the recorded trigger current I c With the minimum trigger current I cmin , Maximum trigger current I cmax For comparison, if the minimum trigger current I cmin<Trigger current I c <Maximum trigger current I cmax , then the trigger current I c Qualified, otherwise, unqualified.

[0021] Furthermore, the action time S d Test: At the trigger current I c During the test, the central processing unit CPU obtains the change of the No. 1 loop current I1 through the channel 1 CH1 of the current sensor BI1→eight-channel analog-to-digital conversion module AD8. When the fifth pin LQD5-seventh pin LQD7 of the zero-power starter LQD is turned on, the loop current IQ at the beginning of the conduction is recorded, and the internal timer of the programmable controller PLC starts timing at the same time. Under the action of the current / temperature characteristics of the positive temperature coefficient thermistor PTC inside the zero-power starter LQD, its resistance begins to increase, and the No. 1 loop current I1 begins to decrease. When the No. 1 loop current I1 drops to IQ / 2, the timing ends. The time recorded at this time is the action time S of the zero-power starter LQD. d , and at the same time the recorded action time S d With the minimum action time S dmin , Maximum action time S dmax By comparison, if the minimum action time S dmin <Action time S d <Maximum action time S dmax , then the action time S d Qualified, otherwise, unqualified.

[0022] Furthermore, the conduction current I 2t Test: At the trigger current I c After the test is completed, the test trigger current I c The conduction current I set by the human-machine interface MT 2t For comparison, if the on-state current I 2t <Trigger current I c , then the conduction current I 2t If it fails, the Y7 terminal…YF terminal of the output module OUT continues to control the relay K7…relay KF to switch the resistance, so that the current I2 of the second loop increases at the set speed V U Continue to increase at a constant speed until the second circuit current I2 rises to the set conduction current I 2t The Y7-YF terminal of the output module OUT controls the relay K7-relay KF to stop the resistor switching. The central processing unit CPU detects whether the current I1 of the first loop is always in the flow state through the current sensor BI1→channel 1 CH1 of the eight-channel analog-to-digital conversion module AD8. If so, it means that the conduction current I 2t Qualified, otherwise, unqualified.

[0023] Furthermore, the disconnect current I 2d Test: On-current I 2t After the test is completed, the current I 2d Test, the Y7 terminal...YF terminal of the output module OUT controls the relay K7...relay KF to switch the resistance, so that the current I2 of the second loop is reduced at the set speed V d The CPU obtains the change of the current I2 of the second loop through the current sensor BI2 → channel 3 CH3 of the eight-channel analog-to-digital conversion module AD8. When the current I2 of the second loop drops to the set disconnection current I 2d When the Y7-YF terminal of the output module OUT controls the relay K7-KF to stop the resistance switching, the central processing unit CPU detects whether the No. 1 loop current I1 is less than the set disconnection judgment current I1 through the current sensor BI1→channel 1 CH1 of the eight-channel analog-to-digital conversion module AD8. 1d , if yes, disconnect the current I 2d The test is passed, otherwise, it fails.

[0024] Furthermore, the power consumption W LQD Test: disconnect current I 2d After the test is completed, the test system maintains the current test status and then continues to disconnect the current I 2d Test, the central processing unit CPU obtains the current I1 of the first loop through the current sensor BI1 → channel 1 CH1 of the eight-channel analog-to-digital conversion module AD8, and obtains the voltage U between the sixth pin LQD6 and the seventh pin LQD7 of the zero-power starter LQD through the voltage sensor BU1 → channel 2 CH2 of the eight-channel analog-to-digital conversion module AD8 6-7 , through U 6-7 ×I1 calculates the power consumption W generated by the sixth pin LQD6-seventh pin LQD7 of the zero-power starter LQD 6-7 , obtain the second loop current I2 through the current sensor BI2 → channel 3 CH3 of the eight-channel analog-to-digital conversion module AD8, and obtain the voltage U between the fifth pin LQD5 and the seventh pin LQD7 of the zero-power starter LQD through the voltage sensor BU2 → channel 4 CH4 of the eight-channel analog-to-digital conversion module AD8 5-7 , through U 5-7 ×I2 calculates the power consumption W generated by the fifth pin LQD5 - the seventh pin LQD7 of the zero-power starter LQD 5-7 , W 6-7 + W 5-7 The power consumption W of the measured zero-power starter LQD LQD , will consume power W LQD The maximum power consumption W is setmax For comparison, if the power consumption W LQD <Maximum power consumption W max , power consumption W LQD The test item is qualified, otherwise it is unqualified.

[0025] Compared with the prior art, the present invention has the following advantages: first, the accuracy and stability of the test voltage and current are high, and their adjustment and deviation control all adopt automatic closed control. When the voltage or current deviates from the required range, the test system will automatically adjust in real time to ensure the accuracy and stability of the test conditions; second, each test item adopts automatic continuous testing. After one-key start, each test item is automatically tested continuously according to the program design. The adjustment of the test conditions, the acquisition of test data, and the comparison and judgment with the test range are all automated. After all items are tested, the final test data and judgment results are displayed on the human-machine interface. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the working principle of a zero-power starter in the prior art.

[0027] Figure 2 The invention is a schematic diagram of the connection relationship of a technical parameter test system of a zero-power starter in the prior art.

[0028] Figure 3 It is a schematic diagram of the connection relationship of the zero-power starter technical parameter testing system according to an embodiment of the present invention.

[0029] Figure 4 It is a schematic diagram of a test interface of a man-machine interface MT according to an embodiment of the present invention.

[0030] Figure 5 It is a schematic diagram of the decomposed structure of a zero-power consumption motor starting thermal protector according to an embodiment of the present invention.

[0031] Figure 6 It is a schematic diagram of the three-dimensional structure of a zero-power consumption motor starting thermal protector according to an embodiment of the present invention.

[0032] Figure 7 It is a structural schematic diagram of a zero-power consumption motor starting thermal protector without a cover plate according to an embodiment of the present invention.

[0033] Figure 8 It is a schematic diagram of the internal structure of a zero-power consumption motor starting thermal protector according to an embodiment of the present invention.

[0034] Fig. 9 1 is a schematic diagram of the three-dimensional structure of the cover plate according to an embodiment of the present invention.

[0035] Fig.10 2 is a schematic diagram of the three-dimensional structure of the cover plate according to an embodiment of the present invention.

[0036] Fig.11 It is a schematic diagram of the three-dimensional structure of the base 1 according to an embodiment of the present invention.

[0037] Fig.12 It is a schematic diagram of the three-dimensional structure of the base according to an embodiment of the present invention.

[0038] Fig.13 Schematic diagram of the three-dimensional structure of the N terminal block according to an embodiment of the present invention.

[0039] Fig.14 It is a schematic diagram of the three-dimensional structure of the first pin of the embodiment of the present invention.

[0040] Fig.15 It is a schematic diagram of the three-dimensional structure of the second pin of the embodiment of the present invention.

[0041] Fig.16 It is a schematic diagram of the three-dimensional structure of the reed according to an embodiment of the present invention.

[0042] Fig.17 It is a schematic diagram of the three-dimensional structure of the bidirectional thyristor according to an embodiment of the present invention.

[0043] Fig.18 It is a schematic diagram of the three-dimensional structure of the current transformer according to an embodiment of the present invention.

[0044] Fig.19 It is a schematic diagram of the three-dimensional structure of the connecting piece according to an embodiment of the present invention.

[0045] Fig. 20 The figure is a schematic diagram of the assembly process of the starting thermal protector according to the embodiment of the present invention.

[0046] In the figure: programmable controller PLC, human-machine interface MT, voltage automatic adjustment device VT, voltage sensor BU0, resistance switching module RL1, resistance switching module RL2, relay K0, current sensor BI1, current sensor BI2, voltage sensor BU1, voltage sensor BU2, zero power starter LQD, Central processing unit CPU, digital-to-analog conversion module DA, eight-channel analog-to-digital conversion module AD8, output module OUT, serial communication interface RS232, Relay K1, relay K2, relay K3, relay K4, relay K5, relay K6, power resistor R1, power resistor R2, power resistor R3, power resistor R4, power resistor R5, power resistor R6, Relay K7, relay K8, relay K9, relay KA, relay KB, relay KC, relay KD, relay KE, relay KF, power resistor R7, power resistor R8, power resistor R9, power resistor RA, power resistor RB, power resistor RC, power resistor RD, power resistor RE, power resistor RF, Base 1, PE terminal block 2, L terminal block 3, N terminal block 4, baffle 5, first pin 6, second pin 7, spring 8, connecting piece 9, cover 10, thermal protector 11, positive temperature coefficient thermistor PTC, bidirectional thyristor T, current transformer CT, PE terminal block installation cavity 1-1, L terminal block installation cavity 1-2, N terminal block installation cavity 1-3, first pin installation cavity 1-4, second pin installation cavity 1-5, connecting piece installation cavity 1-6, baffle installation cavity 1-7, positive temperature coefficient thermistor installation cavity 1-8, spring installation cavity 1-9, bidirectional thyristor installation cavity 1-10, current transformer installation cavity 1-11, base No. 1 card hole 1-12, base No. 2 card hole 1-13, thermal protector installation cavity 1-14, thermal protector installation hook 1-15, N terminal strip plug end 4-1, N terminal strip thread end 4-2, N terminal strip connection end 4-3, The first pin insertion hole 6-1, the first pin connecting blade 6-2, the first pin connecting arm 6-3, the first pin connecting slot 6-4, The second pin socket 7-1, the second pin connecting blade 7-2, the second pin connecting arm 7-3, the second pin connecting end 7-4, The reed is connected to the first card slot 8-1, the reed is connected to the second card slot 8-2, the reed spring 8-3, Connecting piece connecting end 9-1, connecting piece connecting arm 9-2, connecting piece No. 1 connecting slot 9-3, connecting piece No. 2 connecting slot 9-4, Cover plate M socket 10-1, cover plate S socket 10-2, cover plate No. 1 hook 10-3, cover plate No. 2 hook 10-4, first pin socket positioning cavity 10-5, second pin socket positioning cavity 10-6, baffle bar limiting boss 10-7, positive temperature coefficient thermistor limiting boss 10-8, spring plate limiting boss 10-9, current transformer limiting boss 10-10, connecting piece limiting platform 10-11, Thermal protector electrical connection terminal 11-1, thermal protector pin 11-2, The first anode T-1, the second anode T-2, the trigger electrode G, A first pin CT-1, a second pin CT-2, a third pin CT-3, a fourth pin CT-4, a fifth pin LQD5, a sixth pin LQD6, and a seventh pin LQD7. DETAILED DESCRIPTION

[0047] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0048] Example

[0049] See also Figures 3 to 20 As shown, it should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, if there are references to terms such as "upper", "lower", "left", "right", "middle" and "one" in this specification, they are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0050] The zero-power starter technical parameter test system in this embodiment is used to test the technical parameters of the zero-power starter LQD. The test system includes a programmable controller PLC, a human-machine interface MT and an automatic voltage adjustment device VT, and is characterized in that it also includes a voltage sensor BU0, a resistance switching module RL1, a resistance switching module RL2, a relay K0, a current sensor BI1, a current sensor BI2, a voltage sensor BU1 and a voltage sensor BU2.

[0051] The programmable controller PLC in this embodiment is respectively connected to the human-machine interface MT, the voltage automatic regulating device VT, the voltage sensor BU0, the resistance switching module RL1, the resistance switching module RL2, the relay K0, the current sensor BI1, the voltage sensor BU1, the current sensor BI2 and the voltage sensor BU2; the voltage automatic regulating device VT is respectively connected to the voltage sensor BU0, the resistance switching module RL1, the resistance switching module RL2, the voltage sensor BU1, the voltage sensor BU2 and the zero-power starter LQD; the relay K0 is respectively connected to the resistance switching module RL1, the resistance switching module RL2, the current sensor BI1, the voltage sensor BU1, the current sensor BI2, the voltage sensor BU2 and the zero-power starter LQD.

[0052] The resistance switching module RL1 in this embodiment includes relay K1, relay K2, relay K3, relay K4, relay K5, relay K6, power resistor R1, power resistor R2, power resistor R3, power resistor R4, power resistor R5 and power resistor R6. In the resistance switching module RL1, the contacts of relay K1, relay K2, relay K3, relay K4, relay K5 and relay K6 are connected to the two ends of power resistor R1, power resistor R2, power resistor R3, power resistor R4, power resistor R5 and power resistor R6, respectively, to form 6 parallel combinations, which are then connected in series in sequence. The control A ends of relay K1, relay K2, relay K3, relay K4, relay K5 and relay K6 are connected to the V+ end of the DC power supply; the resistance switching module RL2 includes relay K7, relay K8, relay K9, relay KA, relay KB, relay K10, relay K11 and relay K12. C, relay KD, relay KE, relay KF, power resistor R7, power resistor R8, power resistor R9, power resistor RA, power resistor RB, power resistor RC, power resistor RD, power resistor RE and power resistor RF. In the resistance switching module RL2, the contacts of relay K7, relay K8, relay K9, relay KA, relay KB, relay KC, relay KD, relay KE and relay KF are respectively connected to the two ends of power resistor R7, power resistor R8, power resistor R9, power resistor RA, power resistor RB, power resistor RC, power resistor RD, power resistor RE and power resistor RF to form 9 parallel combinations, which are then connected in series in sequence. The control A ends of relay K7, relay K8, relay K9, relay KA, relay KB, relay KC, relay KD, relay KE and relay KF are connected and then connected to the V+ end of the DC power supply.

[0053] The programmable controller PLC in this embodiment includes a central processing unit CPU, a digital-to-analog conversion module DA, an eight-channel analog-to-digital conversion module AD8, an output module OUT and a serial communication interface RS232. The central processing unit CPU is respectively connected to the digital-to-analog conversion module DA, the eight-channel analog-to-digital conversion module AD8, the output module OUT and the serial communication interface RS232. The + end and the - end of the digital-to-analog conversion module DA are respectively connected to the U+ end and the U- end of the voltage automatic regulating device VT. The + end and the - end of channel zero CH0 in the eight-channel analog-to-digital conversion module AD8 are respectively connected to the U+ end and the U- end of the voltage sensor BU0, the + end and the - end of channel one CH1 are respectively connected to the U+ end and the U- end of the current sensor BI1, the + end and the - end of channel two CH2 are respectively connected to the U+ end and the U- end of the voltage sensor BU1, and the + end and the - end of channel three CH3 are respectively connected to the U+ end and the U- end of the current sensor BI2. The U+ terminal and U- terminal, the + terminal and - terminal of channel four CH4 are respectively connected to the U+ terminal and U- terminal of the voltage sensor BU2, the COM terminal in the output module OUT is connected to the V- terminal of the DC power supply, the Y0 terminal is connected to the B terminal of the relay K0, the Y1 terminal, the Y2 terminal, the Y3 terminal, the Y4 terminal, the Y5 terminal, and the Y6 terminal are respectively connected to the B terminal of the relay K1, the relay K2, the relay K3, the relay K4, the relay K5, and the relay K6 in the resistance switching module RL1, the Y7 terminal, the Y8 terminal, the Y9 terminal, the YA terminal, the YB terminal, the YC terminal, the YD terminal, the YE terminal, and the YF terminal are respectively connected to the B terminal of the relay K7, the relay K8, the relay K9, the relay KA, the relay KB, the relay KC, the relay KD, the relay KE, and the relay KF in the resistance switching module RL2, and the serial communication interface RS232 is connected to the human-machine interface MT through a data line to realize two-way data communication.

[0054] In this embodiment, the L end and N end of the mains are connected to the V1 end and V2 end of the voltage automatic regulating device VT respectively, the V3 end of the voltage automatic regulating device VT is connected to the U1 end of the voltage sensor BU0, and is connected to the contact 1 of the relay K1 and the connecting end of the power resistor R1, and is then connected to the contact 1 of the relay K7 and the connecting end of the power resistor R7, the contact 2 end of the relay K6 and the connecting end of the power resistor R6 are connected to the contact 1 end of the relay K0, and the contact 2 end of the relay K0 is respectively connected to the U1 end of the voltage sensor BU1 and the fifth pin LQD5 of the zero-power starter LQD, and the connected wires pass through the current sensor The sensing hole of the current sensor BI1; the contact 2 end of the relay KF and the connection end of the power resistor RF are connected to the contact 3 end of the relay K0, and the contact 4 end of the relay K0 is respectively connected to the U1 end of the voltage sensor BU2 and the sixth pin LQD6 of the zero-power starter LQD, and the connected wires pass through the sensing hole of the current sensor BI2, and the control A end of the relay K0 is connected to the V+ end of the DC power supply; the V4 end of the automatic voltage regulating device VT is respectively connected to the seventh pin LQD7 of the zero-power starter LQD, the U2 end of the voltage sensor BU0, the U2 end of the voltage sensor BU1, and the U2 end of the voltage sensor BU2.

[0055] The zero-power starter technical parameter testing method in this embodiment is used to test the trigger current I of the zero-power starter LQD. c , action time S d , conduction current I 2t , disconnect current I 2d , power consumption W LQD The technical parameters are tested. After the test is started, the test system continuously tests the above test items according to the set test conditions, and compares and judges the test data with the set technical requirements, and outputs the test results. During the test, press the "Test Stop" button on the human-machine interface MT, and the test system will interrupt the test.

[0056] The test method is as follows: parameter setting: set the specified parameters on the human-machine interface MT. The test conditions include the test voltage U, PTC constant temperature resistance R p , No. 1 circuit current regulating resistor R L1 , starting current I q , speed-up rate V U , deceleration rate V d , technical requirements include minimum trigger current I cmin , Maximum trigger current I cmax , minimum action time S dmin , Maximum action time S dmax , Maximum power consumption W max , conduction current I 2t , conduction judgment current I1t , disconnect current I 2d , Disconnection judgment current I 1d .

[0057] Trigger current I c Test: Connect the zero-power starter LQD to the test system, press the "test start" button on the human-machine interface MT, and the test system will first test the trigger current project. The programmable controller PLC will adjust the voltage according to the test voltage U set by the human-machine interface MT. The central processing unit CPU→digital-to-analog conversion module DA outputs an analog DC voltage to control the voltage automatic adjustment device VT to adjust the voltage. At the same time, the voltage sensor BU0 samples the adjusted voltage, converts it into a DC analog signal, and then inputs it into the zeroth channel CH0 of the eight-channel analog-to-digital conversion module AD8, and converts it into a digital signal and inputs it into the central processing unit CPU. If the test voltage U has been adjusted to the specified value, the voltage adjustment is completed; similarly, according to the No. 1 loop current regulating resistor R set by the human-machine interface MT L1 The output module OUT's Y1, Y2, Y3, Y4, Y5, and Y6 terminals control relays K1, K2, K3, K4, K5, and K6 to switch resistances, making the current regulating resistor R L1 Reach the required value; Similarly, according to the test voltage U and starting current I set by the human-machine interface MT q via U / I q Calculate the current regulating resistance R of the second circuit L2 Then, the output module OUT's Y7, Y8, Y9, YA, YB, YC, YD, YE, and YF terminals control relays K7, K8, K9, KA, KB, KC, KD, KE, and KF to switch resistance and adjust the No. 2 loop current I2 to the starting current I q Then, the Y0 terminal of the output module OUT controls the relay K0 to operate, and the zero-power starter LQD is connected to the test voltage U. Then, the resistance switching of relays K7, K8, K9, KA, KB, KC, KD, KE, and KF is controlled through the Y7, Y8, Y9, YA, YB, YC, YD, YE, and YF terminals of the output module OUT to make the current of the second circuit rise at the set speed rate V. UThe CPU obtains the change of the current I2 of the second loop through the current sensor BI2 → the channel 3 CH3 of the eight-channel analog-to-digital conversion module AD8. When the current I2 of the second loop rises to a certain current, the current between the sixth pin LQD6 and the seventh pin LQD7 of the zero-power starter LQD connected in series in the second loop controls the fifth pin LQD5 to the seventh pin LQD7 to be turned on. At the same time, the CPU obtains the change of the current I1 of the first loop through the current sensor BI1 → the channel 1 CH1 of the eight-channel analog-to-digital conversion module AD8. When the current I1 of the first loop is greater than the conduction judgment current I 1t When the output module OUT's Y7, Y8, Y9, YA, YB, YC, YD, YE, and YF terminals control relays K7, K8, K9, KA, KB, KC, KD, KE, and KF to stop resistance switching, the current rising process of the No. 2 loop stops, and the programmable controller PLC automatically records the No. 2 loop current I2 at this time, which is the trigger current I c , and at the same time the recorded trigger current I c With the minimum trigger current I cmin , Maximum trigger current I cmax For comparison, if the minimum trigger current I cmin <Trigger current I c <Maximum trigger current I cmax , then the trigger current I c Qualified, otherwise, unqualified.

[0058] Action time S d Test: At the trigger current I c During the test, the central processing unit CPU obtains the change of the No. 1 loop current I1 through the channel 1 CH1 of the current sensor BI1→eight-channel analog-to-digital conversion module AD8. When the fifth pin LQD5-seventh pin LQD7 of the zero-power starter LQD is turned on, the loop current IQ at the beginning of the conduction is recorded, and the internal timer of the programmable controller PLC starts timing at the same time. Under the action of the current / temperature characteristics of the positive temperature coefficient thermistor PTC inside the zero-power starter LQD, its resistance begins to increase, and the No. 1 loop current I1 begins to decrease. When the No. 1 loop current I1 drops to IQ / 2, the timing ends. The time recorded at this time is the action time S of the zero-power starter LQD. d , and at the same time the recorded action time S d With the minimum action time S dmin , Maximum action time S dmax By comparison, if the minimum action time S dmin <Action time S d <Maximum action time S dmax, then the action time S d Qualified, otherwise, unqualified.

[0059] On-state current I 2t Test: At the trigger current I c After the test is completed, the test trigger current I c The conduction current I set by the human-machine interface MT 2t For comparison, if the on-state current I 2t <Trigger current I c , then the conduction current I 2t If the output module OUT is unqualified, on the contrary, the Y7, Y8, Y9, YA, YB, YC, YD, YE and YF terminals of the output module OUT continue to control the relays K7, K8, K9, KA, KB, KC, KD, KE and KF to switch the resistance, so that the current I2 of the second loop increases at the set speed V U Continue to increase at a constant speed until the second circuit current I2 rises to the set conduction current I 2t The Y7, Y8, Y9, YA, YB, YC, YD, YE and YF terminals of the output module OUT control relays K7, K8, K9, KA, KB, KC, KD, KE and KF to stop resistor switching. The central processing unit CPU detects whether the current I1 of loop 1 is always in the flow state through the current sensor BI1 → channel 1 CH1 of the eight-channel analog-to-digital conversion module AD8. If so, it means that the conduction current I 2t Qualified, otherwise, unqualified.

[0060] Break current I 2d Test: On-current I 2t After the test is completed, the current I 2d Test, the Y7, Y8, Y9, YA, YB, YC, YD, YE, and YF terminals of the output module OUT control relays K7, K8, K9, KA, KB, KC, KD, KE, and KF to switch resistance, so that the current I2 of the second loop is reduced at the set speed V d The CPU obtains the change of the current I2 of the second loop through the current sensor BI2 → channel 3 CH3 of the eight-channel analog-to-digital conversion module AD8. When the current I2 of the second loop drops to the set disconnection current I 2dWhen the output module OUT's Y7, Y8, Y9, YA, YB, YC, YD, YE and YF terminals control relays K7, K8, K9, KA, KB, KC, KD, KE and KF to stop resistance switching, the central processing unit CPU detects whether the No. 1 loop current I1 is less than the set disconnection judgment current I1 through the current sensor BI1 → channel 1 CH1 of the eight-channel analog-to-digital conversion module AD8. 1d , if yes, disconnect the current I 2d The test is passed, otherwise, it fails.

[0061] Power consumption W LQD Test: disconnect current I 2d After the test is completed, the test system maintains the current test status and then continues to disconnect the current I 2d Test, the central processing unit CPU obtains the current I1 of the first loop through the current sensor BI1 → channel 1 CH1 of the eight-channel analog-to-digital conversion module AD8, and obtains the voltage U between the sixth pin LQD6 and the seventh pin LQD7 of the zero-power starter LQD through the voltage sensor BU1 → channel 2 CH2 of the eight-channel analog-to-digital conversion module AD8 6-7 , through U 6-7 ×I1 calculates the power consumption W generated by the sixth pin LQD6-seventh pin LQD7 of the zero-power starter LQD 6-7 , obtain the second loop current I2 through the current sensor BI2 → channel 3 CH3 of the eight-channel analog-to-digital conversion module AD8, and obtain the voltage U between the fifth pin LQD5 and the seventh pin LQD7 of the zero-power starter LQD through the voltage sensor BU2 → channel 4 CH4 of the eight-channel analog-to-digital conversion module AD8 5-7 , through U 5-7 ×I2 calculates the power consumption W generated by the fifth pin LQD5 - the seventh pin LQD7 of the zero-power starter LQD 5-7 , W 6-7 + W 5-7 The power consumption W of the measured zero-power starter LQD LQD , will consume power W LQD The maximum power consumption W is set max For comparison, if the power consumption W LQD <Maximum power consumption W max , power consumption W LQD The test item is qualified, otherwise it is unqualified.

[0062] Brief introduction to the working principle of the zero-power starter LQD: It includes a current transformer CT, a bidirectional thyristor T, and a positive temperature coefficient thermistor PTC. The current transformer CT is designed with 4 pins, namely the first pin CT-1, the second pin CT-2, the third pin CT-3, and the fourth pin CT-4. The primary coil is between the first pin CT-1 and the second pin CT-2, and the secondary coil is between the third pin CT-3 and the fourth pin CT-4; the bidirectional thyristor T is designed with a first anode T-1, a second anode T-2, and a trigger pole G.

[0063] Inside the zero-power starter LQD, the third pin CT-3 of the secondary coil of the current transformer CT is connected to the first anode T-1 of the bidirectional thyristor T and one end of the positive temperature coefficient thermistor PTC respectively, and the fourth pin CT-4 of the secondary coil of the current transformer CT is connected to the trigger pole G of the bidirectional thyristor T; outside the zero-power starter LQD, there are designed a fifth pin LQD5, a sixth pin LQD6, and a seventh pin LQD7, wherein the sixth pin LQD6 is internally connected to the first pin CT-1 of the primary coil of the current transformer CT and externally connected to the Terminal 4, the fifth pin LQD5 is internally connected to the other end of the positive temperature coefficient thermistor PTC and externally connected to terminal 2 of the relay K0, the seventh pin LQD7 is internally connected to the second pin CT-2 of the primary coil of the current transformer CT and the second anode T-2 of the bidirectional thyristor T, and externally connected to the V4 end of the voltage automatic regulating device VT. Through the above connections, the fifth pin LQD5 to the seventh pin LQD7 of the zero-power starter LQD are connected in series to the No. 1 test circuit I1, and the sixth pin LQD6 to the seventh pin LQD7 are connected in series to the No. 2 test circuit I2.

[0064] During the test, the conduction and disconnection of the test circuit No. 1 I1 are controlled by adjusting the current of the test circuit No. 2 I2. That is, when the current of the test circuit No. 2 I2 is large, a large current flows through the primary coil of the current transformer CT connected in series between the sixth pin LQD6 and the seventh pin LQD7, and the induced current of the secondary coil of the current transformer CT is also large. When the induced current is greater than the designed turn-on current of the bidirectional thyristor T, the first anode T-1 and the second anode T-2 of the bidirectional thyristor T are controlled to be turned on, thereby turning on the fifth pin LQD5 of the zero-power starter LQD. -The seventh pin LQD7 turns on the test loop No. 1 I1; conversely, when the current of the test loop No. 2 I2 is small, a small current also flows through the primary coil of the current transformer CT connected in series with the sixth pin LQD6-the seventh pin LQD7, and the induced current of the secondary coil of the current transformer CT is also small. When the induced current is less than the designed shutdown current of the bidirectional thyristor T, the first anode T-1 and the second anode T-2 of the bidirectional thyristor T are controlled to be turned off, thereby disconnecting the test loop No. 1 I1 through the fifth pin LQD5-the seventh pin LQD7 of the zero-power starter LQD.

[0065] The following parameters are explained: The test conditions include test voltage U, PTC constant temperature resistance R p , No. 1 circuit current regulating resistor R L1 , starting current I q , speed-up rate V U , deceleration rate V d .

[0066] Test voltage U: Test voltage condition parameter.

[0067] PTC normal temperature resistor R p : The normal temperature resistance of the positive temperature coefficient thermistor PTC inside the zero power starter LQD.

[0068] Current regulating resistor R of circuit 1 L1 :The resistance value that the resistance switching module RL1 needs to switch during the test is measured by U / R p +R L1 The current of loop No. 1 can be calculated.

[0069] Starting current I q : The initial loading current setting value of the second circuit at the beginning of the test. This setting value must be less than the minimum trigger current I cmin .

[0070] Acceleration rate V U :The speed of the current rise in loop 2. Take the setting of 1A / S as an example. If the current rise resolution is 0.01A / step, it will rise by 100 steps in 1S.

[0071] Deceleration rate V d :The speed of the current drop in loop 2. Take the setting of 1A / S as an example. If the current drop resolution is 0.01A / step, it will drop 100 steps in 1S.

[0072] Technical requirements include minimum trigger current I cmin , Maximum trigger current I cmax , minimum action time S dmin , Maximum action time S dmax , Maximum power consumption W max , conduction current I 2t , conduction judgment current I 1t , disconnect current I 2d , Disconnection judgment current I 1d .

[0073] Minimum trigger current I cmin : Used to measure the trigger current value I c The lower limit setting value of the comparison judgment, if I c <I cmin , it is judged that the measured trigger current value exceeds the lower limit.

[0074] Maximum trigger current I cmax : Used to measure the trigger current value I c The upper limit setting value of the comparison judgment, if I c >I cmax , it is judged that the measured trigger current value exceeds the upper limit.

[0075] Minimum action time S dmin : Used to measure the action time value S d The lower limit setting value of the comparison judgment, if S d <S dmin , it is judged that the measured action time value exceeds the upper limit.

[0076] Maximum action time S dmax : Used to measure the action time value S d The upper limit setting value of the comparison judgment, if S d >S dmax , it is judged that the measured action time value exceeds the upper limit.

[0077] On-state current I 2t : The current setting value required to be loaded on circuit 2 when testing the conduction current test item.

[0078] Conductivity judgment current I 1t : When the set conduction current is loaded on the second circuit, the minimum judgment current setting value for judging whether the first circuit is conductive or not.

[0079] Break current I2d : The current setting value required to be loaded on circuit 2 when testing the disconnect current test item.

[0080] Disconnection judgment current I 1d : When the set disconnection current is loaded on the No. 2 circuit, the maximum judgment current setting value is used to determine whether the No. 1 circuit is disconnected.

[0081] Among them, the model of the voltage automatic regulating device VT is AN97010H; the model of the current sensor BI1 and the current sensor BI2 is WBI415S91; the model of the voltage sensor BUO, the voltage sensor BU1 and the voltage sensor BU2 is WBV415S01; the model of the programmable controller PLC is FP7; the model of the central processing unit CPU is AFP7CPS3RE; the model of the digital-to-analog conversion module DA is AFP7FCRA21, the model of the eight-channel analog-to-digital conversion module AD8 is AFP7AD8, the model of the output module OUT is AFP7Y16T, the model of the serial communication interface RS232 is AFP7CCRS1; the model of the human-machine interface MT is MT6070iH; the model of the relays K0, K1...K6, K7...KF is JQX-38F; the model of the power resistors R0, R1...R6, R7...RF is RKG.

[0082] The following is a case study of the specific test process. The test interface of the human-machine interface MT is as follows: Figure 4 .

[0083] S1. Set the test conditions and technical requirements on the human-machine interface MT: test voltage U=220V, PTC constant temperature resistance R p =15Ω, current regulating resistor R L1 =25Ω, starting current I q =0.8A, speed up rate V U =1A / S, speed reduction rate V d =1A / S, minimum trigger current I cmin =1A, maximum trigger current I cmax =1.6A, minimum operating time S dmin =0.1S, maximum action time S dmax =2S, maximum power consumption W max =0.05W, on-state current I 2t =1.6A, conduction judgment current I 1t >2.0A, disconnect current I 2d =0.9A, disconnection judgment current I 1d <1mA.

[0084] S2. Trigger current test: Connect the zero-power starter to the test system, press the "test start" button on the human-machine interface MT, and the test system will first test the trigger current project. The programmable controller PLC outputs an analog DC voltage from the central processing unit CPU to the digital-to-analog conversion module DA according to the test voltage U set by the human-machine interface MT to control the voltage automatic adjustment device VT to adjust the voltage to 220V. At the same time, the voltage sensor BU0 converts the voltage sampling signal into a DC analog signal and inputs it into the zeroth channel CH0 of the eight-channel analog-to-digital conversion module AD8, and converts it into a digital signal and inputs it into the central processing unit CPU until the voltage has been adjusted to the set voltage range. The voltage adjustment is completed. Similarly, according to the No. 1 loop current regulating resistor R set by the human-machine interface MT, L1 The Y1...Y6 terminals of the output module OUT control relays K1...K6 to switch the resistance, so that the current regulating resistance of loop 1 reaches 25Ω; similarly, according to the test voltage U and starting current I set by the human-machine interface MT q via U / I q Calculate the current regulating resistance R of the second circuit L2 , that is, 220 / 0.8=275Ω, then the output module OUT’s Y7…YF terminal controls relay K7…relay KF to switch the resistance of the resistance switching module RL2 to 275Ω, then the output module OUT’s Y0 terminal controls relay K0 to operate, and the zero-power starter LQD is connected to the test voltage, then the output module OUT’s Y7…YF terminal controls the resistance switching of relay K7…relay KF to make the second loop current I2 rise at the set speed V U (1A / S) rises at a uniform speed, the central processing unit CPU obtains the change status of the current I2 of the second loop through the current sensor BI2→channel three CH3 of the eight-channel analog-to-digital conversion module AD8. When the current I2 of the second loop rises to a certain current, the current between the sixth pin LQD6 and the seventh pin LQD7 of the zero-power starter LQD connected in series in the second loop controls the fifth pin LQD5 to the seventh pin LQD7 to be turned on. At the same time, the central processing unit CPU obtains the change status of the current I1 of the first loop through the current sensor BI1→channel one CH1 of the eight-channel analog-to-digital conversion module AD8. When the current I1 of the first loop is greater than the set conduction judgment current I 1t =2A, the Y7 terminal...YF terminal of the output module OUT controls the relay K7...relay KF to stop the resistance switching, the current rising process of the second circuit stops, and the programmable controller PLC automatically records the current I2 of the second circuit at this time, which is the trigger current I c (1.25), and at the same time the recorded trigger current I c With the minimum trigger current I cmin , Maximum trigger current I cmax For comparison, since Icmin (1.00)<I c (1.25) < I cmax (1.60), the trigger current test item is qualified.

[0085] S3. Action time test: During the trigger current test, the central processing unit CPU obtains the change of the No. 1 loop current I1 through the current sensor BI1→channel 1 CH1 of the eight-channel analog-to-digital conversion module AD8. When the fifth pin 5-seventh pin 7 of the zero-power starter LQD is turned on, the loop current at the beginning of the conduction is recorded as IQ, and the internal timer of the programmable controller PLC starts timing at the same time. Under the action of the current / temperature characteristics of the positive temperature coefficient thermistor PTC inside the zero-power starter LQD, its resistance begins to increase, and the No. 1 loop current I1 begins to decrease. When I1 drops to IQ / 2, the timing ends. The time recorded at this time is the action time S of the zero-power starter LQD. d = (0.68), and at the same time the recorded action time S d With the minimum action time S dmin , Maximum action time S dmax For comparison, since S dmin (0.10)<S d (0.68)<S dmax (2.00), the action time test item is qualified.

[0086] S4. On-current test: After the trigger current test is completed, the trigger current I c The conduction current I set by the human-machine interface MT 2t For comparison, due to I 2t (1.60)<I c (1.25) If the condition is not met, the Y7…YF terminals of the output module OUT continue to control the relays K7…KF to switch the resistance, so that the current I2 of the second loop increases at the set speed V U (1A / S) continues to rise at a uniform speed until the No. 2 loop current I2 rises to the conduction current 1.60A, the Y7 terminal...YF terminal of the output module OUT controls the relay K7...relay KF to stop the resistance switching, and the central processing unit CPU detects that the No. 1 loop current I1 is always in the flow state through the current sensor BI1→channel 1 CH1 of the eight-channel analog-to-digital conversion module AD8. The conduction current test item meets the technical requirements and the test is qualified.

[0087] S5. Disconnection current test: After the conduction current test is completed, the disconnection current test is automatically performed. The Y7 terminal...YF terminal of the output module OUT controls the relay K7...relay KF to switch the resistance, so that the second loop current I2 is reduced at the set speed V d(1A / S) decreases at a constant speed. The CPU obtains the change of the No. 2 loop current I2 through the current sensor BI2 → channel 3 CH3 of the eight-channel analog-to-digital conversion module AD8. When the No. 2 loop current I2 drops to the set disconnection current I 2d (0.9A), the Y7 terminal...YF terminal of the output module OUT controls the relay K7...relay KF to stop the resistance switching, and the central processing unit CPU detects whether the current I1 of the first circuit is less than the set disconnection judgment current I through the current sensor BI1→channel 1 CH1 of the eight-channel analog-to-digital conversion module AD8. 1d (1mA), since I1(0mA)<I 1d (1mA) Judgment conditions, the disconnecting current test item meets the technical requirements and the test is qualified.

[0088] S6. Power consumption test: After the disconnect current test is completed, the test system maintains the current test state and then continues the power consumption test. The central processing unit CPU obtains the No. 1 loop current I1 (0.9A) through the current sensor BI1 → channel 1 CH1 of the eight-channel analog-to-digital conversion module AD8, and obtains the voltage U between the sixth pin 6 and the seventh pin 7 of the zero-power starter LQD through the voltage sensor BU1 → channel 2 CH2 of the eight-channel analog-to-digital conversion module AD8. 6-7 is (0V), through U 6-7 (0.9A) × I1 (0V) is used to calculate the power consumption W generated by the sixth pin 6 to the seventh pin 7 of the zero-power starter LQD 6-7 The current I2 of the second loop is (0W), and the voltage U between the fifth pin 5 and the seventh pin 7 of the zero-power starter LQD is obtained through the current sensor BI2 → the channel 3 CH3 of the eight-channel analog-to-digital conversion module AD8. 5-7 For (220V), through U 5-7 (220V) × I2 (0A) calculates the power consumption W generated by the fifth pin 5 to the seventh pin 7 of the zero-power starter LQD 5-7 is (0W), W 6-7 + W 5-7 The power consumption W of the measured zero-power starter LQD LQD = (0W), W LQD The maximum power consumption W is set max For comparison, since W is satisfied LQD (0W)<W max (0.05W), the power consumption test item passed.

[0089] S7. After the power consumption test is completed, the entire test process is completed, and the test data and comparison judgment results are displayed on the human-machine interface MT.

[0090] The zero-power starter LQD in this embodiment is used for a zero-power motor starting thermal protector. The zero-power motor starting thermal protector includes a thermal protector 11 and a zero-power starter LQD. The zero-power starter LQD includes a base 1, a PE terminal block 2, an L terminal block 3, an N terminal block 4, a baffle 5, a first pin 6, a second pin 7, a positive temperature coefficient thermistor PTC, a reed 8, a bidirectional thyristor T, a current transformer CT, a connecting piece 9 and a cover plate 10. The baffle 5, the first pin 6, the second pin 7, the positive temperature coefficient thermistor PTC, the reed 8, the bidirectional thyristor T, the current transformer CT, and the connecting piece 9 are all arranged in a cavity formed by the base 1 and the cover plate 10, and the PE terminal block 2, the L terminal block 3, and the N terminal block 4 are all arranged in the outer cavity of the base 1.

[0091] The bidirectional thyristor T in this embodiment is provided with a first anode T-1, a second anode T-2 and a trigger pole G, and the current transformer CT is provided with a first pin CT-1, a second pin CT-2, a third pin CT-3 and a fourth pin CT-4, the first pin 6 is connected to the first pin CT-1, the second pin CT-2 is connected to the connecting piece 9, the connecting piece 9 is connected to the N terminal block 4 and the second anode T-2, the first anode T-1 is connected to the third pin CT-3 and the reed 8, the reed 8 is connected to one side of the positive temperature coefficient thermistor PTC, the other side of the positive temperature coefficient thermistor PTC is connected to the second pin 7, and the trigger pole G is connected to the fourth pin CT-4.

[0092] The N terminal block 4 in this embodiment is provided with an N terminal block plug-in terminal 4-1, an N terminal block threaded terminal 4-2 and an N terminal block connecting terminal 4-3. The N terminal block connecting terminal 4-3 is provided on the N terminal block threaded terminal 4-2, and the N terminal block connecting terminal 4-3 is connected to the connecting plate 9.

[0093] In this embodiment, the first pin 6 is provided with a first pin socket 6-1, a first pin connecting blade 6-2, a first pin connecting arm 6-3, and a first pin connecting slot 6-4. The first pin socket 6-1 and the first pin connecting blade 6-2 are arranged at one end of the first pin connecting arm 6-3, and the first pin connecting slot 6-4 is arranged at the other end of the first pin connecting arm 6-3. The first pin connecting slot 6-4 is connected to the first pin CT-1.

[0094] The second pin 7 in this embodiment is provided with a second pin socket 7-1, a second pin connecting blade 7-2, a second pin connecting arm 7-3, and a second pin connecting end 7-4. The second pin socket 7-1 and the second pin connecting blade 7-2 are arranged at one end of the second pin connecting arm 7-3, and the second pin connecting end 7-4 is arranged at the other end of the second pin connecting arm 7-3. The second pin connecting end 7-4 is connected to the other side of the positive temperature coefficient thermistor PTC.

[0095] The reed 8 in this embodiment is provided with a reed connection slot No. 1 8-1, a reed connection slot No. 2 8-2 and a reed spring 8-3. The reed connection slot No. 1 8-1 and the reed connection slot No. 2 8-2 are arranged above the reed 8, and the reed spring 8-3 is arranged on one side of the reed 8. The reed connection slot No. 1 8-1 is connected to the first anode T-1, the reed connection slot No. 2 8-2 is connected to the third pin CT-3, and the reed spring 8-3 is connected to one side of the positive temperature coefficient thermistor PTC.

[0096] The connecting piece 9 in this embodiment is provided with a connecting piece connecting end 9-1, a connecting piece connecting arm 9-2, a connecting piece No. 1 connecting slot 9-3, and a connecting piece No. 2 connecting slot 9-4. The connecting piece connecting end 9-1 is arranged at one end of the connecting piece 9, the connecting piece connecting arm 9-2 is arranged at the other end of the connecting piece 9, and the two ends of the connecting piece connecting arm 9-2 are respectively provided with a connecting piece No. 1 connecting slot 9-3 and a connecting piece No. 2 connecting slot 9-4, the connecting piece connecting end 9-1 is connected to the N terminal block 4, the connecting piece No. 1 connecting slot 9-3 is connected to the second pin CT-2, and the connecting piece No. 2 connecting slot 9-4 is connected to the second anode T-2.

[0097] In this embodiment, the base 1 is provided with a PE terminal block installation cavity 1-1, an L terminal block installation cavity 1-2, an N terminal block installation cavity 1-3, a first pin installation cavity 1-4, a second pin installation cavity 1-5, a connecting piece installation cavity 1-6, a baffle installation cavity 1-7, a positive temperature coefficient thermistor installation cavity 1-8, a spring installation cavity 1-9, a bidirectional thyristor installation cavity 1-10, a current transformer installation cavity 1-11, a base No. 1 card hole 1-12, a base No. 2 card hole 1-13, a thermal protector installation cavity 1-14 and a thermal protector installation hook 1-15, a PE terminal block 2, an L terminal block 3, an N terminal block 4, a first pin 6, a second pin 7, a connecting piece 9, a baffle 5, a positive The temperature coefficient thermistor PTC, reed 8, bidirectional thyristor T and current transformer CT are respectively installed in the PE terminal block installation cavity 1-1, the L terminal block installation cavity 1-2, the N terminal block installation cavity 1-3, the first pin installation cavity 1-4, the second pin installation cavity 1-5, the connecting piece installation cavity 1-6, the baffle installation cavity 1-7, the positive temperature coefficient thermistor installation cavity 1-8, the reed installation cavity 1-9, the bidirectional thyristor installation cavity 1-10, and the current transformer installation cavity 1-11. The thermal protector 11 is installed in the thermal protector installation cavity 1-14 through the thermal protector installation hook 1-15, and the base No. 1 card hole 1-12 and the base No. 2 card hole 1-13 are connected with the cover plate 10.

[0098] In this embodiment, the cover plate 10 is provided with a cover plate M socket 10-1, a cover plate S socket 10-2, a cover plate No. 1 hook 10-3, a cover plate No. 2 hook 10-4, a first pin socket positioning cavity 10-5, a second pin socket positioning cavity 10-6, a baffle limiting boss 10-7, a positive temperature coefficient thermistor limiting boss 10-8, a spring limiting boss 10-9, a current transformer limiting boss 10-10 and a connecting piece limiting platform 10-11. The cover plate M socket 10-1 and the first pin socket positioning cavity 10-5 cooperate with the first pin 6, and the cover plate S socket 10-2 and the second pin socket The positioning cavity 10-6 cooperates with the second pin 7, the baffle limiting boss 10-7, the positive temperature coefficient thermistor limiting boss 10-8, the spring limiting boss 10-9, the current transformer limiting boss 10-10 and the connecting piece limiting platform 10-11 respectively cooperate with the baffle 5, the positive temperature coefficient thermistor PTC, the spring 8, the current transformer CT and the connecting piece 9, the cover plate No. 1 hook 10-3 and the cover plate No. 2 hook 10-4 are connected with the base 1, and the cover plate No. 1 hook 10-3 and the cover plate No. 2 hook 10-4 are connected with the base No. 1 hole 1-12 and the base No. 2 hole 1-13 respectively.

[0099] During the test, Figure 3 The fifth pin LQD5 is connected to Figure 4 The second pin 7 of the connection, Figure 3 The sixth pin LQD6 is connected to Figure 4The first pin 6 of the connection, Figure 3 The seventh pin LQD7 is connected to Figure 4 Connect to N terminal block 4 in the .

[0100] The assembly process of the zero-power starter LQD is as follows: 1. When installing the product, first install the current transformer CT into the current transformer installation cavity 1-11, and then install the first pin 6 and the connecting piece 9 into the first pin installation cavity 1-4 and the connecting piece installation cavity 1-6 respectively. At this time, the first pin connecting slot 6-4 is welded to the first pin CT-1, and the connecting piece No. 1 connecting slot 9-3 is welded to the second pin CT-2.

[0101] 2. Install the reed 8, the second pin 7, and the positive temperature coefficient thermistor PTC into the reed installation cavity 1-9, the second pin installation cavity 1-5, and the positive temperature coefficient thermistor installation cavity 1-8 in sequence. At this time, the reed spring 8-3 contacts one side of the positive temperature coefficient thermistor PTC, and the other side of the positive temperature coefficient thermistor PTC contacts the second pin connection end 7-4. The reed connection No. 2 card slot 8-2 is welded to the third pin CT-3, and then the baffle 5 is installed into the baffle installation cavity 1-7. The reed 8, the positive temperature coefficient thermistor PTC, and the second pin 7 are locked by the baffle 5 to ensure stable contact and conductivity of the positive temperature coefficient thermistor PTC.

[0102] 3. Install the bidirectional thyristor T into the bidirectional thyristor installation cavity 1-10, and finally weld the first anode T-1, the second anode T-2 and the trigger pole G to the spring connecting slot 1 8-1, the connecting piece connecting slot 2 9-4 and the fourth pin CT-4 respectively.

[0103] 4. Install and close the cover 10 and the base 1. The base No. 1 card hole 1-12 and the base No. 2 card hole 1-13 on the base 1 are respectively connected with the cover No. 1 card hook 10-3 and the cover No. 2 card hook 10-4 on the cover 10. At this time, the positioning relationship between the cover 10 and related parts is: the first pin socket 6-1 and the second pin socket 7-1 correspond to the first pin socket positioning cavity 10-5 and the second pin socket positioning cavity 10-6 respectively, and the baffle 5, the positive temperature coefficient thermistor PTC, the reed 8, the current transformer CT, and the connecting piece 9 correspond to the baffle limit boss 10-7, the positive temperature coefficient thermistor limit boss 10-8, the reed limit boss 10-9, the current transformer limit boss 10-10, and the connecting piece limit platform 10-11 respectively.

[0104] 5. Install the PE terminal block 2, L terminal block 3, and N terminal block 4 into the PE terminal block installation cavity 1-1, L terminal block installation cavity 1-2, and N terminal block installation cavity 1-3 of the base 1 respectively, and weld the N terminal block connection end 4-3 and the connection piece connection end 9-1.

[0105] 6. After assembling the above zero-power starter LQD, install the thermal protector 11 into the thermal protector installation cavity 1-14. At this time, the thermal protector 11 and the thermal protector installation hook 1-15 are correspondingly connected and fixed, the thermal protector electrical connection end 11-1 is externally electrically connected, the cover plate M jack 10-1 is connected to the main winding of the motor, and the cover plate S jack 10-2 is connected to the auxiliary winding of the motor.

[0106] After the above steps are installed, a zero-power consumption motor starting thermal protector is formed.

[0107] The working process of the zero-power motor starting thermal protector is as follows: In this embodiment, a zero-power motor starting thermal protector is installed in a refrigerator compressor. The starting thermal protector is directly inserted into the compressor sealed terminal through the first pin jack 6-1 (connected to the compressor M end), the second pin jack 7-1 (connected to the compressor S end), and the thermal protector pin 11-2 (connected to the compressor C end). At the same time, an external running capacitor is connected in parallel between the first pin connecting plug 6-2 and the second pin connecting plug 7-2. Then, the power supply N end is connected to the N terminal block plug end 4-1 or the N terminal block thread end 4-2, the power supply L end is connected to the thermal protector electrical connection end 11-1, and the ground wire is connected to the PE terminal block 2. Other electrical connections and adapters in the refrigeration appliance can be connected through the PE terminal block 2, the L terminal block 3, and the N terminal block 4.

[0108] At this time, the main winding of the motor and the primary coil of the current transformer CT are connected in series to form a main winding operating circuit, the secondary coil of the current transformer CT and the first anode T-1 and the trigger pole G are connected in series to form a bidirectional thyristor trigger circuit, and the auxiliary winding of the motor, the positive temperature coefficient thermistor PTC and the first anode T-1 and the second anode T-2 are connected in series to form an auxiliary winding starting circuit.

[0109] After the AC power supply L and N terminals are powered on, since the motor is in a stalled state at the beginning of power-on, a large current will flow through its main winding circuit, causing a large current to flow through the primary coil of the current transformer CT. Under the action of electromagnetic induction, the secondary coil of the current transformer CT will induce a current of corresponding proportion. Under the premise of selecting appropriate parameters for the current transformer CT, the induced current of the secondary coil of the current transformer CT is sufficient to trigger the conduction between the first anode T-1 and the second anode T-2, and the auxiliary winding starting circuit is connected to generate a starting current, and the motor starts to run. The positive temperature coefficient thermistor PTC connected in series in the starting circuit is connected to the starting current. Under the action of the current transformer CT, the induced current of the secondary coil of the current transformer CT is also much smaller than that at the beginning of power-on. Under the premise of selecting appropriate parameters for the current transformer CT, the induced current will not trigger the conduction between the first anode T-1 and the second anode T-2, and the auxiliary winding starting circuit will be completely shut down. At this time, the power consumption generated by the current transformer CT sampling system can reach ultra-low power consumption at the milliwatt level, which is similar to a "zero power" starter.

[0110] When the grid voltage is too high or a refrigeration system failure occurs, the thermal protector 11 is activated, thereby cutting off the power supply to protect the compressor motor.

[0111] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the present invention. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. Technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A zero power starter technical parameter test system, which is used to test the technical parameters of the zero power starter LQD. The test system includes a programmable controller PLC, a human-machine interface MT and an automatic voltage regulator VT, and is characterized in that: It also includes a voltage sensor BU0, a resistance switching module RL1, a resistance switching module RL2, a relay K0, a current sensor BI1, a current sensor BI2, a voltage sensor BU1 and a voltage sensor BU2. The programmable controller PLC is respectively connected to the human-machine interface MT, the voltage automatic regulating device VT, the voltage sensor BU0, the resistance switching module RL1, the resistance switching module RL2, the relay K0, the current sensor BI1, the voltage sensor BU1, the current sensor BI2 and the voltage sensor BU2. The voltage automatic regulating device VT is respectively connected to the voltage sensor BU0, the resistance switching module RL1, the resistance switching module RL2, the voltage sensor BU1, the voltage sensor BU2 and the zero-power starter LQD. The relay K0 is respectively connected to the resistance switching module RL1, the resistance switching module RL2, the current sensor BI1, the voltage sensor BU1, the current sensor BI2, the voltage sensor BU2 and the zero-power starter LQD; The resistance switching module RL1 includes a relay K1, a relay K2, a relay K3, a relay K4, a relay K5, a relay K6, a power resistor R1, a power resistor R2, a power resistor R3, a power resistor R4, a power resistor R5 and a power resistor R6. In the resistance switching module RL1, ends 1 and 2 of the contacts of the relay K1, the relay K2, the relay K3, the relay K4, the relay K5 and the relay K6 are respectively connected to the two ends of the power resistor R1, the power resistor R2, the power resistor R3, the power resistor R4, the power resistor R5 and the power resistor R6 to form 6 parallel combinations, which are then connected in series in sequence. The control A ends of the relay K1, the relay K2, the relay K3, the relay K4, the relay K5 and the relay K6 are connected and then connected to the V+ end of the DC power supply. The resistance switching module RL2 includes a relay K7, a relay K8, a relay K9, a relay KA, a relay KB, a relay KC, a relay KD, a relay KE, a relay KF, a power resistor R7, a power resistor R8, a power resistor R9, a power resistor RA, a power resistor RB, a power resistor RC, a power resistor RD, a power resistor RE and a power resistor RF. In the resistance switching module RL2, the contacts of relays K7, K8, K9, KA, KB, KC, KD, KE and KF are connected to the two ends of power resistors R7, R8, R9, RA, RB, RC, RD, RE and RF respectively to form 9 parallel combinations, which are then connected in series in sequence. The control A ends of relays K7, K8, K9, KA, KB, KC, KD, KE and KF are connected and then connected to the V+ end of the DC power supply. The programmable controller PLC includes a central processing unit CPU, a digital-to-analog conversion module DA, an eight-channel analog-to-digital conversion module AD8, an output module OUT and a serial communication interface RS232. The central processing unit CPU is respectively connected to the digital-to-analog conversion module DA, the eight-channel analog-to-digital conversion module AD8, the output module OUT and the serial communication interface RS232. The + end and the - end of the digital-to-analog conversion module DA are respectively connected to the U+ end and the U- end of the voltage automatic regulating device VT. The + end and the - end of channel zero CH0 in the eight-channel analog-to-digital conversion module AD8 are respectively connected to the U+ end and the U- end of the voltage sensor BU0, the + end and the - end of channel one CH1 are respectively connected to the U+ end and the U- end of the current sensor BI1, and the + end and the - end of channel two CH1 are respectively connected to the U+ end and the U- end of the current sensor BI1. The + and - ends of H2 are respectively connected to the U+ and U- ends of the voltage sensor BU1, the + and - ends of the channel three CH3 are respectively connected to the U+ and U- ends of the current sensor BI2, and the + and - ends of the channel four CH4 are respectively connected to the U+ and U- ends of the voltage sensor BU2, the COM end in the output module OUT is connected to the V- end of the DC power supply, the Y0 end is connected to the B end of the relay K0, the Y1 end...Y6 end is respectively connected to the B end of the relay K1...relay K6 in the resistance switching module RL1, and the Y7 end...YF end is respectively connected to the B end of the relay K7...relay KF in the resistance switching module RL2, and the serial communication interface RS232 is connected to the human-machine interface MT through a data line to realize two-way data communication; The L end and N end of the mains are connected to the V1 end and V2 end of the automatic voltage regulator VT respectively, the V3 end of the automatic voltage regulator VT is connected to the U1 end of the voltage sensor BU0, and is connected to the connecting end of the contact 1 of the relay K1 and the power resistor R1, and is then connected to the connecting end of the contact 1 of the relay K7 and the power resistor R7, the contact 2 end of the relay K6 and the connecting end of the power resistor R6 are connected to the contact 1 end of the relay K0, the contact 2 end of the relay K0 is connected to the U1 end of the voltage sensor BU1 and the fifth pin LQD5 of the zero-power starter LQD respectively, and the connected wires pass through the sensing hole of the current sensor BI1; The contact 2 end of the relay KF and the connection end of the power resistor RF are connected to the contact 3 end of the relay K0, and the contact 4 end of the relay K0 is respectively connected to the U1 end of the voltage sensor BU2 and the sixth pin LQD6 of the zero-power starter LQD, and the connected wires pass through the sensing hole of the current sensor BI2, and the control A end of the relay K0 is connected to the V+ end of the DC power supply; The V4 end of the voltage automatic regulating device VT is respectively connected to the seventh pin LQD7 of the zero-power starter LQD, the U2 end of the voltage sensor BU0, the U2 end of the voltage sensor BU1, and the U2 end of the voltage sensor BU2.

2. A test method for a zero-power starter technical parameter test system based on claim 1, the test method being used to test a trigger current I of a zero-power starter LQD c , action time S d , conduction current I 2t , disconnect current I 2d , power consumption W LQD The technical parameters are tested, which are characterized by: The test method is as follows: parameter setting: set the specified parameters on the human-machine interface MT, and the test conditions include the test voltage U, the PTC constant temperature resistance R p , No. 1 circuit current regulating resistor R L1 , starting current I q , speed-up rate V U , deceleration rate V d , technical requirements include minimum trigger current I cmin , Maximum trigger current I cmax , minimum action time S dmin , Maximum action time S dmax , Maximum power consumption W max , conduction current I 2t , conduction judgment current I 1t , disconnect current I 2d , Disconnection judgment current I 1d .

3. The testing method of the zero-power starter technical parameter testing system according to claim 2 is characterized in that: Trigger current I c Test: Connect the zero-power starter LQD to the test system, press the "test start" button on the human-machine interface MT, and the test system will first test the trigger current project. The programmable controller PLC will adjust the voltage according to the test voltage U set by the human-machine interface MT. The central processing unit CPU→digital-to-analog conversion module DA outputs an analog DC voltage to control the voltage automatic adjustment device VT to adjust the voltage. At the same time, the voltage sensor BU0 samples the adjusted voltage, converts it into a DC analog signal, and then inputs it into the zeroth channel CH0 of the eight-channel analog-to-digital conversion module AD8, and converts it into a digital signal and inputs it into the central processing unit CPU. If the test voltage U has been adjusted to the specified value, the voltage adjustment is completed; similarly, according to the No. 1 loop current regulating resistor R set by the human-machine interface MT L1 The output module OUT's Y1...Y6 terminals control relays K1...K6 to switch the resistors, making the No. 1 loop current regulating resistor R L1 Reach the required value; Similarly, according to the test voltage U and starting current I set by the human-machine interface MT q via U / I q Calculate the current regulating resistance R of the second circuit L2 Then, the Y7 terminal...YF terminal of the output module OUT controls the relay K7...relay KF to switch the resistance, and adjust the second loop current I2 to the starting current I q Then, the Y0 terminal of the output module OUT controls the relay K0 to operate, and the zero-power starter LQD is connected to the test voltage U. Then, the resistance switching of the relay K7...relay KF is controlled through the Y7...YF terminal of the output module OUT to make the current of the second circuit increase at the set speed rate V U The CPU obtains the change of the current I2 of the second loop through the current sensor BI2 → the channel 3 CH3 of the eight-channel analog-to-digital conversion module AD8. When the current I2 of the second loop rises to a certain current, the current between the sixth pin LQD6 and the seventh pin LQD7 of the zero-power starter LQD connected in series in the second loop controls the fifth pin LQD5 to the seventh pin LQD7 to be turned on. At the same time, the CPU obtains the change of the current I1 of the first loop through the current sensor BI1 → the channel 1 CH1 of the eight-channel analog-to-digital conversion module AD8. When the current I1 of the first loop is greater than the conduction judgment current I 1t When the Y7-YF terminal of the output module OUT controls the relay K7-KF to stop the resistance switching, the current rising process of the second circuit stops, and the programmable controller PLC automatically records the current I2 of the second circuit at this time, which is the trigger current I c , and at the same time the recorded trigger current I c With the minimum trigger current I cmin , Maximum trigger current I cmax For comparison, if the minimum trigger current I cmin <Trigger current I c <Maximum trigger current I cmax , then the trigger current I c Qualified, otherwise, unqualified.

4. The testing method of the zero-power starter technical parameter testing system according to claim 3 is characterized in that: Action time S d Test: At the trigger current I c During the test, the central processing unit CPU obtains the change of the No. 1 loop current I1 through the channel 1 CH1 of the current sensor BI1→eight-channel analog-to-digital conversion module AD8. When the fifth pin LQD5-seventh pin LQD7 of the zero-power starter LQD is turned on, the loop current IQ at the beginning of the conduction is recorded, and the internal timer of the programmable controller PLC starts timing at the same time. Under the action of the current / temperature characteristics of the positive temperature coefficient thermistor PTC inside the zero-power starter LQD, its resistance begins to increase, and the No. 1 loop current I1 begins to decrease. When the No. 1 loop current I1 drops to IQ / 2, the timing ends. The time recorded at this time is the action time S of the zero-power starter LQD. d , and at the same time the recorded action time S d With the minimum action time S dmin , Maximum action time S dmax By comparison, if the minimum action time S dmin <Action time S d <Maximum action time S dmax , then the action time S d Qualified, otherwise, unqualified.

5. The testing method of the zero-power starter technical parameter testing system according to claim 4 is characterized in that: On-state current I 2t Test: At the trigger current I c After the test is completed, the test trigger current I c The conduction current I set by the human-machine interface MT 2t For comparison, if the on-state current I 2t <Trigger current I c , then the conduction current I 2t If it fails, the Y7 terminal…YF terminal of the output module OUT continues to control the relay K7…relay KF to switch the resistance, so that the current I2 of the second loop increases at the set speed V U Continue to increase at a constant speed until the second circuit current I2 rises to the set conduction current I 2t The Y7-YF terminal of the output module OUT controls the relay K7-relay KF to stop the resistor switching. The central processing unit CPU detects whether the current I1 of the first loop is always in the flow state through the current sensor BI1→channel 1 CH1 of the eight-channel analog-to-digital conversion module AD8. If so, it means that the conduction current I 2t Qualified, otherwise, unqualified.

6. The testing method of the zero-power starter technical parameter testing system according to claim 5, characterized in that: Break current I 2d Test: On-current I 2t After the test is completed, the current I 2d Test, the Y7 terminal...YF terminal of the output module OUT controls the relay K7...relay KF to switch the resistance, so that the current I2 of the second loop is reduced at the set speed V d The CPU obtains the change of the current I2 of the second loop through the current sensor BI2 → channel 3 CH3 of the eight-channel analog-to-digital conversion module AD8. When the current I2 of the second loop drops to the set disconnection current I 2d When the Y7-YF terminal of the output module OUT controls the relay K7-KF to stop the resistance switching, the central processing unit CPU detects whether the No. 1 loop current I1 is less than the set disconnection judgment current I1 through the current sensor BI1→channel 1 CH1 of the eight-channel analog-to-digital conversion module AD8. 1d , if yes, disconnect the current I 2d The test is passed, otherwise, it fails.

7. The testing method of the zero-power starter technical parameter testing system according to claim 6, characterized in that: Power consumption W LQD Test: disconnect current I 2d After the test is completed, the test system maintains the current test status and then continues to disconnect the current I 2d Test, the central processing unit CPU obtains the current I1 of the first loop through the current sensor BI1 → channel 1 CH1 of the eight-channel analog-to-digital conversion module AD8, and obtains the voltage U between the sixth pin LQD6 and the seventh pin LQD7 of the zero-power starter LQD through the voltage sensor BU1 → channel 2 CH2 of the eight-channel analog-to-digital conversion module AD8 6-7 , through U 6-7 ×I1 calculates the power consumption W generated by the sixth pin LQD6-seventh pin LQD7 of the zero-power starter LQD 6-7 , obtain the second loop current I2 through the current sensor BI2 → channel 3 CH3 of the eight-channel analog-to-digital conversion module AD8, and obtain the voltage U between the fifth pin LQD5 and the seventh pin LQD7 of the zero-power starter LQD through the voltage sensor BU2 → channel 4 CH4 of the eight-channel analog-to-digital conversion module AD8 5-7 , through U 5-7 ×I2 calculates the power consumption W generated by the fifth pin LQD5 - the seventh pin LQD7 of the zero-power starter LQD 5-7 , W 6-7 + W 5-7 The power consumption W of the measured zero-power starter LQD LQD , will consume power W LQD The maximum power consumption W is set max For comparison, if the power consumption W LQD <Maximum power consumption W max , power consumption W LQD The test item is qualified, otherwise it is unqualified.

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