CN-224216826-U - Leakage current detection type PCBA test circuit and equipment

CN224216826UCN 224216826 UCN224216826 UCN 224216826UCN-224216826-U

Abstract

The utility model discloses a leakage current detection type PCBA test circuit and device, which comprise a test current signal output unit, a test voltage signal output unit and a test result signal output unit, wherein the test current signal output unit is used for outputting leakage current detection current signals, the test current signal output unit is provided with a current regulating circuit used for regulating the numerical value of the leakage current detection current signals, the test voltage signal output unit is used for outputting the leakage current detection voltage signals, the test voltage signal output unit is provided with a voltage regulating circuit used for regulating the numerical value of the leakage current detection voltage signals, the leakage current detection current signals and the leakage current detection voltage signals are used for being loaded on PCBA to be detected, when the PCBA receives the leakage current detection current signals and the leakage current detection voltage signals, the test result output unit is used for outputting the test result signals.

Inventors

Jia Cunrong
LIU SHUAN
GAO WEIWEI
XU JIE
ZHENG WANG
ZHANG YUNFEI
ZHAO ZILONG
XIANG YUXING

Assignees

浙江正泰电器股份有限公司

Dates

Publication Date: 20260508
Application Date: 20250514

Claims (16)

1. A leakage current detection type PCBA test circuit, comprising: a test current signal output unit, a test voltage signal output unit, and a test result signal output unit; The test current signal output unit is used for outputting a leakage current detection current signal; The test current signal output unit is provided with a current regulating circuit which is used for regulating the value of the leakage current detection current signal; the test voltage signal output unit is used for outputting a leakage current detection voltage signal; The test voltage signal output unit is provided with a voltage regulating circuit which is used for regulating the value of the leakage current detection voltage signal; The leakage current detection current signal and the leakage current detection voltage signal are used for being loaded on the PCBA to be detected; when the PCBA receives the leakage current detection current signal and the leakage current detection voltage signal, outputting a leakage current protection signal; The test result output unit is configured to output a test result signal when receiving the leakage current protection signal, wherein the test result signal is used for indicating that the PCBA passes the leakage current test.
2. The leakage current detection type PCBA testing circuit according to claim 1, wherein the testing current signal output unit comprises a first transformer, at least one current signal output branch; The current signal output branch circuit comprises a current limiting resistor with adjustable numerical value, a first relay and a magnetic ring; The first winding end of the first transformer is electrically connected with a power supply, the current limiting resistor is connected with a normally open contact of the first relay in series, and then forms a first loop with the second winding end of the first transformer, and a wire of the first loop passes through the magnetic ring; And the output end of the magnetic ring is used for outputting the leakage current detection current signal.
3. A leakage current detection type PCBA test circuit according to claim 2, wherein the test current signal output unit further comprises an ammeter connected in series within the first loop; The ammeter is used for displaying the value of the current in the first loop.
4. The leakage current detection type PCBA test circuit according to claim 1, wherein the test voltage signal output unit includes at least one voltage signal output branch; The voltage signal output branch circuit comprises a voltage regulating motor, a voltage regulator, a second relay, a third relay and a voltage regulating controller; The voltage regulating signal output end of the voltage regulating controller is electrically connected with the voltage regulating motor and is used for outputting a voltage regulating signal; the voltage regulating motor is connected with the voltage regulator, and the voltage regulating motor is used for regulating the output voltage of the voltage regulator according to the voltage regulating signal; The first winding end of the voltage regulator is electrically connected with a power supply, and the second winding end of the voltage regulator is connected with a voltage output end through a normally open contact of the second relay; The voltage output end is used for being connected with a leakage current detection voltage output end, and the leakage current detection voltage output end is used for outputting the leakage current detection voltage signal; the coil of the second relay and the normally open contact of the third relay form a second loop, and the first control end of the voltage regulating controller is electrically connected with the coil of the third relay.
5. The leakage current detection type PCBA test circuit according to claim 4, wherein the test voltage signal output unit further comprises a commutation switch; The reversing switch is arranged at the voltage output end, and the second control end of the voltage regulating controller is electrically connected with the reversing switch; the reversing switch is used for switching the voltage output end to output the first voltage or the second voltage.
6. The leakage current detection-type PCBA testing circuit according to claim 4, wherein the test result output unit includes a fourth relay, a fifth relay, a sixth relay, a seventh relay; The fourth relay and the fifth relay form a power-on self-locking structure, when the fourth relay is powered on, the fifth relay is self-locked, and when the fifth relay is self-locked, the voltage output end is continuously conducted; the sixth relay and the seventh relay form a tripping structure, and two ends of a leakage current protection signal input end are connected with a coil of the sixth relay in series; The leakage current protection signal input end is used for receiving the leakage current protection signal, and the sixth relay is configured to be electrified when the PCBA outputs the leakage current protection signal; When the sixth relay is electrified, the fifth relay is disconnected, the seventh relay is self-locked, and when the seventh relay is self-locked, the test result output unit continuously outputs the test result signal.
7. The leakage current detection type PCBA testing circuit of claim 6, wherein the voltage output terminal includes a first output terminal, a second output terminal, the leakage current detection voltage output terminal includes a third output terminal, a fourth output terminal, a fifth output terminal; the first output end is electrically connected with the third output end, and the second output end is electrically connected with the fourth output end or the fifth output end; The test result output unit further comprises a change-over switch, and the change-over switch is used for electrically connecting the second output end with the fourth output end or electrically connecting the second output end with the fifth output end.
8. The leakage current detection-type PCBA testing circuit according to claim 7, wherein the test result output unit further includes a shunt resistor, an eighth relay; And one end of the leakage current protection signal input end is also in switchable series connection with the normally-closed contact and the normally-closed contact of the eighth relay, and the normally-open contact of the eighth relay is also in series connection with the shunt resistor.
9. The leakage current detection type PCBA testing circuit according to claim 7, wherein the output voltages of the third and fourth output terminals comprise 220V voltage, and the output voltages of the third and fifth output terminals comprise 380V voltage.
10. A leakage current detection type PCBA testing apparatus, comprising the testing circuit of any one of claims 1 to 9, further comprising a controller; The controller is connected with the test current signal output unit, the test voltage signal output unit and the test result signal output unit; The controller is used for adjusting the value of the leakage current detection current signal by controlling the test current signal output unit, controlling the test voltage signal output unit to adjust the value of the leakage current detection voltage signal, and receiving the test result signal by the test result signal output unit.
11. The leakage current detection type PCBA testing device according to claim 10, further comprising a touch screen electrically connected to the controller, the touch screen for communication interaction with the controller, inputting a test instruction and displaying a test result; The input test instruction is used for adjusting the value of the leakage current detection current signal and adjusting the value of the leakage current detection voltage signal.
12. The leakage current detection type PCBA testing apparatus of claim 10, further comprising a hold down linkage for securing the leakage current detection type PCBA to be tested.
13. The leakage current detection type PCBA testing apparatus according to claim 12, wherein the hold-down linkage comprises a biaxial cylinder, a travel switch, a press bar, a carrier plate; The press machine is mechanically connected with the double-shaft air cylinder through a connecting plate, and the press machine is used for providing a mounting point of the press rod; the travel switch is used for monitoring the movement position of the press machine; The carrier plate is used for supporting the leakage current detection type PCBA.
14. The leakage current detection type PCBA testing apparatus according to claim 13, further comprising a probe device comprising a needle bed, a probe; The carrier plate can be arranged above the needle bed in a vertically movable mode, the probe is assembled on the needle bed, and the probe is used for injecting leakage current detection signals into the leakage current detection type PCBA to be detected.
15. The leakage current detection type PCBA testing apparatus according to claim 10, further comprising a rack, a sliding rail drawer slidably connected to the rack, the sliding rail drawer for placing an intermediate relay, an ac contactor in the testing circuit; the controller is electrically connected with the intermediate relay, and the controller controls the action of the alternating current contactor through the intermediate relay.
16. The leakage current detection type PCBA testing apparatus according to claim 15, further comprising a safety grating disposed on the frame; The controller is connected with the safety grating and is configured to control the stopping of the leakage current test according to the safety detection signal of the safety grating; and if the person or object enters the leakage current test area, the safety grating generates the safety detection signal.

Description

Leakage current detection type PCBA test circuit and equipment Technical Field The embodiment of the utility model relates to the technical field of detection equipment, in particular to a leakage current detection type PCBA test circuit and device. Background At present, after a self-made simple clamp is used for clamping a linkage product in a test link of a leakage current detection type PCBA (Printed Circuit Board Assembly ) in the low-voltage electrical appliance industry, electric signal interaction is carried out through a manual detection platform, and the functional reliability of the leakage current detection type PCBA is judged manually according to electric parameters. The limitations of the equipment and the judging method require manual leading in the test link, and the problems of low test efficiency, low return rate and the like are caused by the situations of small test function coverage, complicated test operation, long period and the like. Disclosure of utility model The utility model provides a leakage current detection type PCBA test circuit and a leakage current detection type PCBA test device, so as to achieve the aim of improving the automation of the PCBA test device. The embodiment of the utility model provides a leakage current detection type PCBA test circuit, which comprises the following components: a test current signal output unit, a test voltage signal output unit, and a test result signal output unit; The test current signal output unit is used for outputting a leakage current detection current signal; The test current signal output unit is provided with a current regulating circuit which is used for regulating the value of the leakage current detection current signal; the test voltage signal output unit is used for outputting a leakage current detection voltage signal; The test voltage signal output unit is provided with a voltage regulating circuit which is used for regulating the value of the leakage current detection voltage signal; The leakage current detection current signal and the leakage current detection voltage signal are used for being loaded on the PCBA to be detected; when the PCBA receives the leakage current detection current signal and the leakage current detection voltage signal, outputting a leakage current protection signal; The test result output unit is configured to output a test result signal when receiving the leakage current protection signal, wherein the test result signal is used for indicating that the PCBA passes the leakage current test. Optionally, the test current signal output unit includes a first transformer, at least one current signal output branch; The current signal output branch circuit comprises a current limiting resistor with adjustable numerical value, a first relay and a magnetic ring; The first winding end of the first transformer is electrically connected with a power supply, the current limiting resistor is connected with a normally open contact of the first relay in series, and then forms a first loop with the second winding end of the first transformer, and a wire of the first loop passes through the magnetic ring; And the output end of the magnetic ring is used for outputting the leakage current detection current signal. Optionally, the test current signal output unit further comprises an ammeter, and the ammeter is connected in series in the first loop; The ammeter is used for displaying the value of the current in the first loop. Optionally, the test voltage signal output unit includes at least one voltage signal output branch; The voltage signal output branch circuit comprises a voltage regulating motor, a voltage regulator, a second relay, a third relay and a voltage regulating controller; The voltage regulating signal output end of the voltage regulating controller is electrically connected with the voltage regulating motor and is used for outputting a voltage regulating signal; the voltage regulating motor is connected with the voltage regulator, and the voltage regulating motor is used for regulating the output voltage of the voltage regulator according to the voltage regulating signal; The first winding end of the voltage regulator is electrically connected with a power supply, and the second winding end of the voltage regulator is connected with a voltage output end through a normally open contact of the second relay; The voltage output end is used for being connected with a leakage current detection voltage output end, and the leakage current detection voltage output end is used for outputting the leakage current detection voltage signal; the coil of the second relay and the normally open contact of the third relay form a second loop, and the first control end of the voltage regulating controller is electrically connected with the coil of the third relay. Optionally, the test voltage signal output unit further comprises a reversing switch; The reversing switch is arranged at the voltage output end, and the second