A detection circuit for a circuit board

Abstract

The present invention provides a circuit board detection circuit for a circuit board, comprising: a control circuit, a sampling circuit, and a tripping circuit, wherein the tripping circuit is connected to the load end of the circuit board to be tested; one end of the control circuit is connected to an external signal sending device, and the other end is connected to one end of the sampling circuit, for collecting a leakage signal sent by the external signal sending device and sending the leakage signal to the sampling circuit; the other end of the sampling circuit is connected to the input end of the circuit board to be tested, for generating a tripping signal based on the leakage signal, and controlling the tripping circuit connected to the circuit board to trip. By implementing the present invention, the problem of being unable to perform performance testing on circuit boards before they are installed in a circuit breaker is solved.

Description

Technical Field

[0001] The present invention relates to the field of circuit breaker detection, and in particular to a detection circuit of a circuit board. Background Art

[0002] As devices in power distribution systems that protect people's lives and property, circuit breakers quickly cut off power in the event of a leakage, ensuring safe electricity use and avoiding unnecessary losses. Therefore, to improve circuit breaker reliability and safeguard users' lives and property, circuit breakers undergo performance testing before leaving the factory.

[0003] However, current testing methods for electronic circuit breakers with circuit boards simply energize the board and measure the voltage at test points. This fails to test characteristics such as operation and timing before the board is installed in the circuit breaker, resulting in incomplete testing. When product operating characteristics fail to meet factory specifications, the board must be removed and replaced, without being able to determine the cause of the fault. Therefore, how to perform performance testing on electronic circuit breakers connected to circuit boards is an urgent issue. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that a performance test cannot be performed on a circuit board before the circuit board is installed in a circuit breaker, thereby providing a detection circuit for the circuit board.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] An embodiment of the present invention provides a detection circuit for a circuit board, wherein the circuit board is applied to an electronic circuit breaker. The detection circuit includes: a control circuit, a sampling circuit, and a tripping circuit, wherein the tripping circuit is connected to a load end of the circuit board under test; one end of the control circuit is connected to an external signal sending device, and the other end is connected to one end of the sampling circuit, and is configured to collect a leakage signal sent by the external signal sending device and send the leakage signal to the sampling circuit; the other end of the sampling circuit is connected to an input end of the circuit board under test, and is configured to generate a tripping signal based on the leakage signal, thereby controlling the tripping circuit connected to the circuit board under test to trip.

[0007] Optionally, the tripping circuit includes: a first relay, and a first relay coil corresponding to the first relay is connected to the load end of the circuit board to be tested.

[0008] Optionally, the control circuit includes: a relay circuit and a start switch, wherein the relay circuit includes four relays; one end of each relay coil in the relay circuit is connected to the first output end of the signal sending device through the first normally closed switch corresponding to the first relay, and the other end of each relay coil in the relay circuit is connected to the fourth output end of the signal sending device through the first normally open switch corresponding to the second relay in the relay circuit; each output end of the signal sending device is connected to the input end of the sampling circuit through the second normally open switch corresponding to each relay in the relay circuit; and the start switch is connected in parallel with the first normally open switch corresponding to the second relay.

[0009] Optionally, the start switch is a momentary switch.

[0010] Optionally, the control circuit further includes: an emergency stop switch, one end of the emergency stop switch is connected to the other end of the start switch, and the other end of the emergency stop switch is connected to the fourth end of the signal sending device.

[0011] Optionally, the emergency stop switch is a self-locking switch.

[0012] Optionally, the sampling circuit includes a current transformer.

[0013] Optionally, the detection circuit also includes: a first indicator light, a second indicator light and a third indicator light, wherein one end of the first indicator light is connected to the first output end of the current transformer, and the other end is connected to the fourth output end of the current transformer; one end of the second indicator light is connected to the second output end of the current transformer, and the other end is connected to the fourth output end of the current transformer; one end of the third indicator light is connected to the third output end of the current transformer, and the other end is connected to the fourth output end of the current transformer.

[0014] The technical solution of the present invention has the following advantages:

[0015] The detection circuit of the circuit board provided by the present invention includes: a control circuit, a sampling circuit and a tripping circuit, wherein the tripping circuit is connected to the load end of the circuit board to be tested; one end of the control circuit is connected to an external signal sending device, and the other end is connected to one end of the sampling circuit, for collecting the leakage signal sent by the external signal sending device and sending the leakage signal to the sampling circuit; the other end of the sampling circuit is connected to the input end of the circuit board to be tested, for generating a tripping signal based on the leakage signal, and controlling the tripping circuit connected to the circuit board to be tested to trip. By connecting the circuit board to be tested to the detection circuit, using the detection circuit to replace the circuit breaker mechanism, equivalently simulating the opening and closing of the circuit breaker, and realizing the test of the characteristics of the electronic circuit breaker circuit board, the problem that the circuit board cannot be tested for performance before being installed in the circuit breaker is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 is a principle block diagram of a specific example of a detection circuit of a circuit board in an embodiment of the present invention;

[0018] Figure 2 This is a tripping circuit diagram in an embodiment of the present invention;

[0019] Figure 3 1 is a detection circuit diagram of a circuit board in an embodiment of the present invention;

[0020] Figure 4 This is a circuit diagram for installing an indicator light in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components; wireless connections or wired connections. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0024] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] The embodiment of the present invention provides a circuit board detection circuit for implementing performance testing of the circuit board in an electronic circuit breaker. Figure 1 As shown, the above-mentioned detection circuit includes: a control circuit 1, a sampling circuit 2 and a tripping circuit 3, wherein the tripping circuit 3 is connected to the load end of the circuit board to be tested; one end of the control circuit 1 is connected to an external signal sending device, and the other end is connected to one end of the sampling circuit 2, for collecting the leakage signal sent by the external signal sending device and sending the leakage signal to the sampling circuit 2; the other end of the sampling circuit 2 is connected to the input end of the circuit board to be tested, for generating a tripping signal according to the leakage signal, and controlling the tripping circuit 3 connected to the circuit board to be tested to trip.

[0026] In one specific embodiment, when performing a performance test on a circuit board under test, the input terminal of the circuit board under test is first connected to a sampling circuit 2 in a detection circuit, and the load terminal (i.e., the leakage signal output terminal) is connected to a tripping circuit 3 in the detection circuit. The detection circuit is then used to perform the performance test on the circuit board under test. Specifically, after the control circuit 1 collects the leakage signal transmitted by an external signal transmitting device, it transmits the leakage signal to the sampling circuit 2. The sampling circuit 2 generates a tripping signal based on the leakage signal and controls the tripping circuit 3 connected to the leakage signal output terminal of the circuit board under test to trip. Simultaneously, the detection circuit also returns the tripping signal to the external signal transmitting device, and the test results of the circuit board under test are displayed on the display screen of the external signal transmitting device. If the test results indicate that the tripping circuit 3 can trip normally, the circuit board under test is determined to be qualified. If the test results indicate that the tripping circuit 3 cannot trip normally, the circuit board under test is determined to be unqualified, and the circuit board under test is repaired for the failure to trip, or the circuit board under test is removed from the circuit boards required for circuit breaker installation. In the embodiment of the present invention, the sampling circuit 2 includes a current transformer, and the trip signal is generated by using the current transformer.

[0027] The detection circuit of the circuit board provided by the present invention includes: a control circuit, a sampling circuit and a tripping circuit, wherein the tripping circuit is connected to the load end of the circuit board to be tested; one end of the control circuit is connected to an external signal sending device, and the other end is connected to one end of the sampling circuit, for collecting the leakage signal sent by the external signal sending device and sending the leakage signal to the sampling circuit; the other end of the sampling circuit is connected to the input end of the circuit board to be tested, for generating a tripping signal based on the leakage signal, and controlling the tripping circuit connected to the circuit board to be tested to trip. By connecting the circuit board to be tested to the detection circuit, using the detection circuit to replace the circuit breaker mechanism, equivalently simulating the opening and closing of the circuit breaker, and realizing the test of the characteristics of the electronic circuit breaker circuit board, the problem that the circuit board cannot be tested for performance before being installed in the circuit breaker is solved.

[0028] In one embodiment, the trip circuit 3 includes: a first relay KJ1 , and a first relay coil corresponding to the first relay KJ1 is connected to the load end of the circuit board to be tested.

[0029] In a specific embodiment, since the performance test of the circuit board to be tested needs to be carried out before the circuit board to be tested is installed in the circuit breaker, and at this time, due to the lack of a driving mechanism of the tripping circuit 3, the tripping action cannot be completed after the control circuit 1 detects the leakage signal. Figure 2 As shown, in the detection circuit, the first relay KJ1 coil is used instead of the release coil to complete the tripping action.

[0030] In one embodiment, if Figure 3 As shown, the control circuit 1 includes: a relay circuit 11 and a start switch 12, wherein the relay circuit 11 includes four relays; one end of each relay coil in the relay circuit 11 is connected to the first output end of the signal sending device through the first normally closed switch corresponding to the first relay KJ1, and the other end of each relay coil in the relay circuit 11 is connected to the fourth output end of the signal sending device through the first normally open switch corresponding to the second relay KJ2 in the relay circuit 11; each output end of the signal sending device is connected to the input end of the sampling circuit 2 through the second normally open switch corresponding to each relay in the relay circuit 11; the start switch 12 is connected in parallel with the first normally open switch corresponding to the second relay KJ2.

[0031] In one embodiment, the start switch 12 is a momentary switch. That is, when the start switch 12 is pressed, the relay circuit 11 is energized. When the switch 12 is released, the switch 12 rebounds, disconnecting the relay circuit 11. To prevent the rebound of the start switch 12 after the switch 12 is released, which could cause a power loss in the relay circuit 11, a first normally open switch corresponding to the second relay KJ2 is connected in parallel with the start switch 12 in this embodiment of the present invention, providing a self-locking circuit for the start switch 12.

[0032] In the embodiment of the present invention, Figure 3 As shown, the control circuit 1 further includes an emergency stop switch 13, one end of which is connected to the other end of the start switch 12, and the other end of the emergency stop switch 13 is connected to the fourth end of the signal transmission device. Specifically, the emergency stop switch 13 is a self-locking switch and is normally closed. In an emergency, the detection circuit can be disconnected by opening the emergency stop switch 13. When the detection circuit returns to normal, the emergency stop switch 13 can be manually closed. Since the emergency stop switch 13 is a self-locking switch, it remains on after being pressed.

[0033] In the embodiment of the present invention, Figure 3 As shown, the relay circuit 11 includes a second relay KJ2, a third relay KJ3, a fourth relay KJ4, and a fifth relay KJ5. One end of the second relay KJ2, one end of the third relay KJ3, one end of the fourth relay KJ4, and one end of the fifth relay KJ5 are respectively connected to the first output end of the signal transmitting device via the first normally closed switch corresponding to the first relay KJ1, and the other ends of the second relay KJ2, the other end of the third relay KJ3, the other end of the fourth relay KJ4, and the other end of the fifth relay KJ5 are respectively connected to the fourth output end of the signal transmitting device via the first normally open switch corresponding to the second relay KJ2 in the relay circuit 11. Furthermore, the first output terminal L1 of the signal transmitting device is connected to the first input terminal of the sampling circuit 2 via the second normally-open switch corresponding to the second relay KJ2 in the relay circuit 11; the second output terminal L2 of the signal transmitting device is connected to the second input terminal of the sampling circuit 2 via the first normally-open switch and the second normally-open switch corresponding to the third relay KJ3 in the relay circuit 11; the third output terminal L3 of the signal transmitting device is connected to the third input terminal of the sampling circuit 2 via the first normally-open switch and the second normally-open switch corresponding to the fourth relay KJ4 in the relay circuit 11; and the fourth output terminal N of the signal transmitting device is connected to the fourth input terminal of the sampling circuit 2 via the first normally-open switch and the second normally-open switch corresponding to the fifth relay KJ5 in the relay circuit 11. In the embodiment of the present invention, the second relay KJ2, the third relay KJ3, the fourth relay KJ4, and the fifth relay KJ5 are all double-pole relays, which is merely an example and not a limitation.

[0034] Specifically, when performing a performance test on a circuit board under test, the starting switch 12 is first closed, the relay circuit 11 is instantly turned on, the second relay KJ2, the third relay KJ3, the fourth relay KJ4, and the fifth relay KJ5 are energized, and the first normally-open switch corresponding to the second relay KJ2 is closed, providing a self-locking circuit for the starting switch 12, so that the relay circuit 11 remains in the on state. Since the second relay KJ2, the third relay KJ3, the fourth relay KJ4, and the fifth relay KJ5 are energized, the second normally-open switch corresponding to the second relay KJ2, the first normally-open switch and the second normally-open switch corresponding to the third relay KJ3, the first normally-open switch and the second normally-open switch corresponding to the fourth relay KJ4, and the first normally-open switch and the second normally-open switch corresponding to the fifth relay KJ5 are all closed. At this point, the detection circuit is turned on, and the performance test of the circuit board under test can be performed.

[0035] Furthermore, when the external signal sending device inputs a leakage signal to the current transformer through the normally open switches corresponding to each relay in the relay circuit 11 (the normally open switches are closed at this time), the current transformer generates a trip signal based on the leakage signal and controls the first relay KJ1 connected to the circuit board to be tested to lose power. Due to the loss of power to the first relay KJ1, its corresponding first normally closed switch is disconnected, which in turn causes the relay circuit 11 to be disconnected, causing the normally open switches corresponding to each relay in the relay circuit 11 to also change from a closed state to an open state. At this point, the entire detection circuit is tripped, completing the performance test of the circuit board to be tested. In an embodiment of the present invention, according to the equivalence principle, the first relay KJ1, the second relay KJ2, the third relay KJ3, the fourth relay KJ4, and the fifth relay KJ5 are used to replace the circuit breaker mechanism, and the detection circuit composed of the relays is used to simulate the opening and closing of the circuit breaker, thereby realizing the test of the characteristics of the electronic circuit breaker circuit board.

[0036] In one embodiment, if Figure 4 As shown, the detection circuit also includes: a first indicator light LED1, a second indicator light LED2 and a third indicator light LED3, wherein one end of the first indicator light LED1 is connected to the first output terminal A of the current transformer, and the other end is connected to the fourth output terminal N' of the current transformer; one end of the second indicator light LED2 is connected to the second output terminal B of the current transformer, and the other end is connected to the fourth output terminal N' of the current transformer; one end of the third indicator light LED3 is connected to the third output terminal C of the current transformer, and the other end is connected to the fourth output terminal N' of the current transformer.

[0037] In a specific embodiment, by setting an indicator light on each phase of the current transformer, it is possible to determine whether there is current on each phase of the current transformer during the test by turning the indicator light on or off, and then determine whether the leakage signal sent by the external signal sending device is normal by judging whether the indicator light is on or off.

[0038] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A detection circuit for a circuit board, wherein the circuit board is applied to an electronic circuit breaker, characterized in that: The detection circuit includes: a control circuit, a sampling circuit and a tripping circuit, wherein: The trip circuit is connected to the load end of the circuit board to be tested; One end of the control circuit is connected to the external signal sending device, and the other end is connected to one end of the sampling circuit, for collecting the leakage signal sent by the external signal sending device and sending the leakage signal to the sampling circuit; The other end of the sampling circuit is connected to the input end of the circuit board to be tested, and is used to generate a trip signal according to the leakage signal to control the trip circuit connected to the circuit board to be tested to trip; The trip circuit includes: a first relay, a first relay coil corresponding to the first relay being connected to a load end of the circuit board to be tested; The control circuit includes: a relay circuit and a start switch, wherein: The relay circuit includes four relays; One end of each relay coil in the relay circuit is connected to the first output end of the signal sending device via a first normally closed switch corresponding to the first relay, and the other end of each relay coil in the relay circuit is connected to the fourth output end of the signal sending device via a first normally open switch corresponding to the second relay in the relay circuit; Each output terminal of the signal sending device is connected to the input terminal of the sampling circuit through a second normally open switch corresponding to each relay in the relay circuit; The starting switch is connected in parallel with the first normally open switch corresponding to the second relay; The sampling circuit includes a current transformer.

2. The detection circuit of the circuit board according to claim 1, characterized in that: The starting switch is a momentary switch.

3. The detection circuit of the circuit board according to claim 2, characterized in that: The control circuit further includes an emergency stop switch, one end of the emergency stop switch is connected to the other end of the start switch, and the other end of the emergency stop switch is connected to the fourth end of the signal sending device.

4. The detection circuit of the circuit board according to claim 3, characterized in that: The emergency stop switch is a self-locking switch.

5. The detection circuit of the circuit board according to claim 1, characterized in that: The detection circuit further includes: a first indicator light, a second indicator light and a third indicator light, wherein: One end of the first indicator light is connected to the first output end of the current transformer, and the other end is connected to the fourth output end of the current transformer; One end of the second indicator light is connected to the second output end of the current transformer, and the other end is connected to the fourth output end of the current transformer; One end of the third indicator light is connected to the third output end of the current transformer, and the other end is connected to the fourth output end of the current transformer.

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