Switching power supply test circuit and device

Abstract

The utility model relates to the technical field of detection, in particular to a switching power supply test circuit and a switching power supply test device, which are characterized in that a first state indicating lamp circuit is connected to a live wire circuit between a first live wire input end and a control switch and between a second live wire input end and the control switch; after the double-pole double-throw switch on the switching circuit is closed, a user can judge whether the connection between the alternating current input end of the switching power supply to be tested and the alternating current power supply is correct or not by observing the on / off of the first indicating lamp. The connection between the AC input end of the to-be-tested switching power supply and the AC power supply can be changed by changing the position of the double-pole-double-throw switch, so that the control switch on the live wire line is controlled to be closed when the connection between the AC input end of the to-be-tested switching power supply and the AC power supply is correct. Correct connection between the to-be-tested switching power supply and the alternating current power supply is achieved, and the situation of machine explosion when the switching power supply and the alternating current power supply are reversely connected is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of detection, in particular to a switching power supply test circuit and device. Background Technique

[0002] At present, when the external power supplies of many electrical devices on the market are connected, it is necessary to closely distinguish between the neutral wire and the live wire of the connected power cord. In practical applications, if there is a wrong connection between the switching power supply and the AC power supply and the switching power supply is powered on, the switching power supply will be damaged at this time. Content of the Utility Model

[0003] An embodiment of the utility model provides a switching power supply test circuit and device to solve the problem that the switching power supply is damaged due to wrong connection between the switching power supply and the AC power supply in the prior art.

[0004] In the first aspect, the utility model provides a switching power supply test circuit, including: a live wire line, a neutral wire line, a positive output line, a negative output line, a short-circuit line, a switch line and a first status indication line. The live wire line includes a first live wire input end, a second live wire input end and a live wire output end. The neutral wire line includes a first neutral wire input end, a second neutral wire input end and a neutral wire output end. The live wire output end and the neutral wire output end are used to connect the AC input end of the to-be-tested switching power supply. The DC output end of the to-be-tested switching power supply is connected to a load through the positive output line and the negative output line. One end of the short-circuit line is connected to the neutral wire output end, and the other end is connected to the negative output line;

[0005] A double-pole double-throw switch is arranged on the switch line. The double-pole double-throw switch includes a first input end, a second input end, a first output end and a second output end. The first input end is connected to the first output end, and the second input end is connected to the second output end. The first input end and the second input end are used to connect an AC power supply. When the double-pole double-throw switch is in the first position, the first output end is connected to the first live wire input end, and the second output end is connected to the first neutral wire input end. When the double-pole double-throw switch is in the second position, the first output end is connected to the second neutral wire input end, and the second output end is connected to the second live wire input end;

[0006] A control switch is further arranged on the live wire line. A first indicator light is arranged on the first status indication line. One end of the first indicator light is connected to the live wire line between the first live wire input end, the second live wire input end and the control switch, and the other end of the first indicator light is grounded.

[0007] In an embodiment, the switching power supply test circuit further includes: a second status indication line;

[0008] A unidirectional conduction element and a second indicator light are provided on the second state indication line. The input end of the second state indication line is connected to the output end of the positive output line, and the output end of the second state indication line is connected to the output end of the negative output line.

[0009] In one embodiment, the unidirectional conduction element is a diode.

[0010] In one embodiment, the breakdown voltage of the diode is greater than 100V.

[0011] In one embodiment, the switching power supply test circuit further includes: a safety resistor;

[0012] One end of the safety resistor is connected to the live wire line between the first live wire input end and the second live wire input end and the control switch, and the other end of the safety resistor is connected to one end of the first indicator light.

[0013] In one embodiment, the first indicator light is a neon lamp.

[0014] In a second aspect, the present invention provides a switching power supply test device, including: a housing and the switching power supply test circuit as described in any one of the above first aspects provided in the housing; wherein,

[0015] A first mounting hole, a second mounting hole, and a third mounting hole are provided on the housing. The first indicator light is arranged in the first mounting hole, the control switch is arranged in the second mounting hole, and the double-pole double-throw switch is arranged in the third mounting hole;

[0016] An AC socket, a switching power supply socket, a first terminal, and a second terminal are provided on the housing. The input end of the AC socket is used to connect to the AC power supply. The first output end of the AC socket is used to connect to the first input end of the double-pole double-throw switch. The second output end of the AC socket is used to connect to the second input end of the double-pole double-throw switch. The first input end of the switching power supply socket is used to connect to the live wire output end of the live wire line. The second input end of the switching power supply socket is used to connect to the neutral wire output end of the neutral wire line. The output end of the switching power supply socket is used to connect to the AC input end of the switching power supply to be tested. One end of the first terminal is connected to the DC output end of the switching power supply to be tested. One end of the second terminal is connected to the negative output line of the switching power supply to be tested. The other end of the first terminal and the other end of the second terminal are connected to a load.

[0017] In one embodiment, heat dissipation holes are provided on the housing.

[0018] In one embodiment, a fourth mounting hole is provided on the housing;

[0019] The second indicator light is arranged in the fourth mounting hole.

[0020] In one embodiment, the housing is a cube;

[0021] The first mounting hole, the second mounting hole, the switch power socket and the third mounting hole are arranged on the first side surface of the housing, the AC socket is arranged on the second side surface of the housing, and the first wiring terminal and the second wiring terminal are arranged on the third side surface of the housing.

[0022] The beneficial effects of the embodiment of the present utility model compared with the prior art are as follows:

[0023] In the switch power supply test circuit of the present utility model, by connecting the first status indicator light circuit to the live wire circuit between the first live wire input terminal and the second live wire input terminal and the control switch, after the double-pole double-throw switch on the switch circuit is closed, the user can judge whether the connection between the AC input terminal of the switch power supply to be tested and the AC power supply is correct by observing the lighting and extinguishing of the first indicator light. And when the connection between the AC input terminal of the switch power supply to be tested and the AC power supply is incorrect, the connection between the AC input terminal of the switch power supply to be tested and the AC power supply can be changed by changing the position of the double-pole double-throw switch. Furthermore, when the connection between the AC input terminal of the switch power supply to be tested and the AC power supply is correct, the control switch on the live wire circuit is controlled to be closed to realize the correct connection between the AC input terminal of the switch power supply to be tested and the AC power supply, avoiding the situation of explosion due to the reverse connection of the live wire and neutral wire between the switch power supply and the AC power supply. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments of the present utility model will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is the circuit diagram of the switch power supply test circuit provided by the first embodiment of the present utility model;

[0026] Figure 2 It is the circuit diagram of the switch power supply test circuit provided by the second embodiment of the present utility model;

[0027] Figure 3 It is the structural schematic diagram of the switch power supply test device provided by the third embodiment of the present utility model;

[0028] Among them, 100 is a switching power supply test circuit, 200 is a housing, L is a live wire line, N is a neutral wire line, 30 is a positive output line, 40 is a negative output line, 50 is a short - circuit line, 60 is a switch line, 70 is a first status indication line, 80 is a second status indication line, 21 is a first mounting hole, 22 is a second mounting hole, 23 is a third mounting hole, 24 is an AC socket, 25 is a switching power supply socket, 26 is a first terminal, 27 is a second terminal, and 28 is a heat dissipation hole. Detailed implementation mode

[0029] In order to make the technical problems, technical solutions and beneficial effects solved by the present utility model more clearly understood, the following further details the present utility model in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0030] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0031] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0032] In order to thoroughly understand the present utility model, detailed structures and steps will be proposed in the following description to explain the technical solutions proposed by the present utility model. The preferred embodiments of the present utility model are described in detail as follows. However, in addition to these detailed descriptions, the present utility model can also have other implementation modes.

[0033] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0034] See Figure 1 , which is a circuit diagram of a switching power supply test circuit 100 provided for the first embodiment of the present invention. Among them, the switching power supply test circuit 100 includes a live wire line L, a neutral wire line N, a positive output line 30, a negative output line 40, a short-circuit line 50, a switch line 60, and a first status indication line 70. The live wire line L includes a first live wire input terminal 1, a second live wire input terminal 3, and a live wire output terminal. The neutral wire line N includes a first neutral wire input terminal 2, a second neutral wire input terminal 4, and a neutral wire output terminal. The live wire output terminal and the neutral wire output terminal are used to connect the AC input terminal of the switching power supply S1 to be tested. The DC output terminal of the switching power supply S1 to be tested is connected to a load through the positive output line 30 and the negative output line 40. One end of the short-circuit line 50 is connected to the neutral wire output terminal, and the other end is connected to the negative output line 40.

[0035] A double-pole double-throw switch K1 is provided on the switch line 60. The double-pole double-throw switch K1 includes a first input terminal, a second input terminal, a first output terminal, and a second output terminal. The first input terminal is connected to the first output terminal, and the second input terminal is connected to the second output terminal. The first input terminal and the second input terminal are used to connect an AC power supply. When the double-pole double-throw switch K1 is in the first position, the first output terminal is connected to the first live wire input terminal 1, and the second output terminal is connected to the first neutral wire input terminal 2. When the double-pole double-throw switch K1 is in the second position, the first output terminal is connected to the second neutral wire input terminal 4, and the second output terminal is connected to the second live wire input terminal 3.

[0036] A control switch K2 is also provided on the live wire line L. A first indicator light is provided on the first status indication line 70. One end of the first indicator light is connected to the live wire line L between the first live wire input terminal 1, the second live wire input terminal 3, and the control switch K2, and the other end of the first indicator light is grounded.

[0037] In practical applications, a neon lamp can be used as the first indicator light to achieve the corresponding function. In practical applications, it is not limited to this. It can be determined according to its specific application environment, and all are within the protection scope of this application.

[0038] The working process of the above switching power supply test circuit 100 is as follows: When the live wire output end of the live wire line L and the neutral wire output end of the neutral wire line N are connected to the AC input end of the switching power supply S1 to be tested, and the first input end and the second input end of the double-pole double-throw switch K1 are connected to the AC power supply, the user can determine whether the connection between the switching power supply S1 to be tested and the AC power supply is correct by observing the lighting and extinguishing of the first indicator light set on the first status indication line 70. Specifically, if the first indicator light emits light, it means that the wiring between the switching power supply S1 to be tested and the AC power supply is correct. At this time, the control switch K2 can be controlled to close to realize the connection between the AC power supply and the switching power supply S1 to be tested; if the first indicator light does not emit light, it means that the wiring between the switching power supply S1 to be tested and the AC power supply is incorrect. At this time, the position of the double-pole double-throw switch K1 is changed from the first position to the second position, or from the second position to the first position, so as to change the connection between the first output end and the second output end of the double-pole double-throw switch K1 and the live wire line L and the neutral wire line N, and then the control switch K2 is controlled to close to realize the correct connection between the AC power supply and the switching power supply S1 to be tested, and avoid the situation of explosion due to incorrect connection.

[0039] In the switching power supply test circuit 100 of this embodiment, by connecting the first status indicator light L1 line to the live wire line L between the first live wire input end 1 and the second live wire input end 3 and the control switch K2, after the double-pole double-throw switch K1 on the switch line 60 is closed, the user can determine whether the connection between the AC input end of the switching power supply S1 to be tested and the AC power supply is correct by observing the lighting and extinguishing of the first indicator light. When the connection is incorrect, the connection between the AC input end of the switching power supply S1 to be tested and the AC power supply can be changed by changing the position of the double-pole double-throw switch K1. Furthermore, when the connection between the AC input end of the switching power supply S1 to be tested and the AC power supply is correct, the control switch K2 on the live wire line L is controlled to close, realizing the correct connection between the switching power supply S1 to be tested and the AC power supply, and avoiding the situation of explosion when the switching power supply S1 to be tested and the AC power supply are incorrectly connected.

[0040] See Figure 2 , which is the circuit diagram of a switching power supply test circuit 100 provided by the second embodiment of the present invention. On the basis of the previous embodiment, the switching power supply test circuit 100 further includes: a second status indication line 80; wherein, a unidirectional conduction element and a second indicator light L2 are arranged on the second status indication line 80, the input end of the second status indication line 80 is connected to the output end of the positive output line 30, and the output end of the second status indication line 80 is connected to the output end of the negative output line 40.

[0041] Specifically, the second indicator light L2 can be a green indicator light, and as Figure 2As shown, the unidirectional conduction element provided on the second state indication line 80 may be a diode D1. Optionally, in practical applications, the breakdown voltage of the diode D1 is greater than 100V. There is no specific limitation here, and it can be determined according to its specific application environment, all within the protection scope of this application.

[0042] The working process of the above-mentioned switching power supply test circuit 100 is as follows: In practical applications, when the positive output line 30 and the negative output line 40 are connected to the DC output terminal of the switching power supply S1 to be tested, the connection between the DC output terminal of the switching power supply S1 to be tested and the positive output line 30 and the negative output line 40 can be judged by observing the lighting and extinguishing of the second indicator light L2. Specifically, if the second indicator light L2 emits light, it means that the connection between the switching power supply S1 to be tested and the positive output line 30 and the negative output line 40 is correct; if the second indicator light L2 does not emit light, it means that the connection between the switching power supply S1 to be tested and the positive output line 30 and the negative output line 40 is incorrect. At this time, the connection between the switching power supply S1 to be tested and the positive output line 30 and the negative output line 40 needs to be adjusted to avoid misconnection between the switching power supply S1 to be tested and the load.

[0043] The switching power supply test circuit 100 of this embodiment adopts the second state indication line 80, so that the user can judge whether the connection between the DC output terminal of the switching power supply S1 to be tested and the positive output line 30 and the negative output line 40 is correct by observing the lighting and extinguishing of the second indicator light L2 on the second state indication line 80. When the second indicator light L2 does not emit light, the connection between the switching power supply S1 to be tested and the positive output line 30 and the negative output line 40 is adjusted to prevent misconnection between the switching power supply S1 to be tested and the load, improving the safety and reliability of the switching power supply test circuit 100.

[0044] See Figure 2 , which is the circuit diagram of a switching power supply test circuit 100 provided by the third embodiment of the present invention. On the basis of the above embodiment, the switching power supply test circuit 100 further includes: a safety resistor R1; wherein, one end of the safety resistor R1 is connected to the live wire line L between the first live wire input terminal 1 and the second live wire input terminal 3 and the control switch K2, and the other end of the safety resistor R1 is connected to one end of the first indicator light.

[0045] In practical applications, a resistor with a resistance value in the range of 1 to 3 megohms can be selected as the safety resistor R1 to achieve the corresponding function. There is no specific limitation here, and it can be determined according to its specific application environment, all within the protection scope of this application.

[0046] The switching power supply test circuit 100 of this embodiment uses a safety resistor R1 to prevent excessive current from flowing into the first indicator light, thereby protecting the first indicator light from damage and improving the safety and reliability of the switching power supply test circuit 100.

[0047] See Figure 3 , based on the above embodiment, the switching power supply test device includes: a housing 200 and the switching power supply test circuit 100 as described in any of the above embodiments provided inside the housing 200; wherein:

[0048] The housing 200 is provided with a first mounting hole 21, a second mounting hole 22, and a third mounting hole 23. The first indicator light is disposed within the first mounting hole 21, the control switch K2 is disposed within the second mounting hole 22, and the double-pole double-throw switch K1 is disposed within the third mounting hole 23;

[0049] The housing 200 is provided with an AC socket 24, a switching power supply socket 25, a first terminal 26, and a second terminal 27. The input end of the AC socket 24 is used to connect to an AC power supply. The first output end of the AC socket 24 is used to connect to the first input end of the double-pole double-throw switch K1. The second output end of the AC socket 24 is used to connect to the second input end of the double-pole double-throw switch K1. The first input end of the switching power supply socket 25 is used to connect to the live wire output end of the live wire line L. The second input end of the switching power supply socket 25 is used to connect to the neutral wire output end of the neutral wire line N. The output end of the switching power supply socket 25 is used to connect to the AC input end of the switching power supply S1 to be tested. One end of the first terminal 26 is connected to the DC output end of the switching power supply S1 to be tested. One end of the second terminal 27 is connected to the negative output line 40 of the switching power supply S1 to be tested. The other ends of the first terminal 26 and the second terminal 27 are connected to a load.

[0050] The switching power supply test device of this embodiment uses the switching power supply test circuit 100 as described in any of the above embodiments. After the double-pole double-throw switch K1 on the switching line 60 is closed, the user can determine whether the connection between the AC input end of the switching power supply S1 to be tested and the AC power supply is correct by observing the lighting and extinguishing of the first indicator light. When the connection is incorrect, the connection between the AC input end of the switching power supply S1 to be tested and the AC power supply can be changed by changing the position of the double-pole double-throw switch K1. Then, when the connection between the AC input end of the switching power supply S1 to be tested and the AC power supply is correct, the control switch K2 on the live wire line L is closed, realizing the correct connection between the switching power supply S1 to be tested and the AC power supply, and avoiding the situation of explosion when the switching power supply and the AC power supply have the live wire and neutral wire reversed; and it is possible to determine whether the connection between the AC input end of the switching power supply S1 to be tested and the AC power supply is correct without the operator touching, improving the safety of the switching power supply test.

[0051] SeeFigure 3 , which is a schematic structural diagram of a switching power supply testing device provided in the fourth embodiment of the present invention. On the basis of the above embodiment, heat dissipation holes 28 are provided on the housing 200.

[0052] Optionally, as Figure 3 shown, fourth mounting holes 29 are provided on the housing 200. In actual application, the second indicator light L2 is arranged in the fourth mounting holes 29; and the housing 200 can also be a cube. Among them, the first mounting holes 21, the second mounting holes 22, the switching power supply socket 25 and the third mounting holes 23 are arranged on the first side surface of the housing 200, the AC socket 24 is arranged on the second side surface of the housing 200, and the first wiring terminal 26 and the second wiring terminal 27 are arranged on the third side surface of the housing 200. This is not limited in actual application and can be determined according to its specific application environment, and all are within the protection scope of the present application.

[0053] For the switching power supply testing device of this embodiment, by providing heat dissipation holes 28 on the housing 200, the switching power supply testing circuit 100 can dissipate heat through the heat dissipation holes 28 on the housing 200.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A switching power supply test circuit, characterized in that Comprising: A live wire line, a neutral wire line, a positive output line, a negative output line, a short - circuit line, a switch line and a first status indication line. The live wire line includes a first live wire input end, a second live wire input end and a live wire output end. The neutral wire line includes a first neutral wire input end, a second neutral wire input end and a neutral wire output end. The live wire output end and the neutral wire output end are used to connect the AC input end of the switch power supply to be tested. The DC output end of the switch power supply to be tested is connected to the load through the positive output line and the negative output line. One end of the short - circuit line is connected to the neutral wire output end, and the other end is connected to the negative output line; A double - pole double - throw switch is provided on the switch line. The double - pole double - throw switch includes a first input end, a second input end, a first output end and a second output end. The first input end is connected to the first output end, and the second input end is connected to the second output end. The first input end and the second input end are used to connect to an AC power supply. When the double - pole double - throw switch is in the first position, the first output end is connected to the first live wire input end, and the second output end is connected to the first neutral wire input end. When the double - pole double - throw switch is in the second position, the first output end is connected to the second neutral wire input end, and the second output end is connected to the second live wire input end; A control switch is further provided on the live wire line. A first indicator light is provided on the first status indication line. One end of the first indicator light is connected to the live wire line between the first live wire input end, the second live wire input end and the control switch, and the other end of the first indicator light is grounded.

2. The switching power supply test circuit according to claim 1, wherein The switch power supply test circuit further includes: a second status indication line; A one - way conduction element and a second indicator light are provided on the second status indication line. The input end of the second status indication line is connected to the output end of the positive output line, and the output end of the second status indication line is connected to the output end of the negative output line.

3. The switching power supply test circuit according to claim 2, wherein, The one - way conduction element is a diode.

4. The switching power supply test circuit according to claim 3, characterized in that, The breakdown voltage of the diode is greater than 100V.

5. The switching power supply test circuit according to claim 1, wherein The switch power supply test circuit further includes: a safety resistor; One end of the safety resistor is connected to the live wire line between the first live wire input end, the second live wire input end and the control switch, and the other end of the safety resistor is connected to one end of the first indicator light.

6. The switching power supply test circuit according to claim 1, characterized in that The first indicator light is a neon lamp.

7. A switching power supply testing device, characterized in that, Comprising: a housing and the switch power supply test circuit according to any one of claims 1 to 6 provided in the housing; wherein, A first mounting hole, a second mounting hole and a third mounting hole are provided on the housing. The first indicator light is arranged in the first mounting hole, the control switch is arranged in the second mounting hole, and the double - pole double - throw switch is arranged in the third mounting hole; An AC socket, a switching power supply socket, a first terminal and a second terminal are provided on the housing. The input end of the AC socket is used to connect to the AC power supply. The first output end of the AC socket is used to connect to the first input end of the double-pole double-throw switch. The second output end of the AC socket is used to connect to the second input end of the double-pole double-throw switch. The first input end of the switching power supply socket is used to connect to the live wire output end of the live wire line. The second input end of the switching power supply socket is used to connect to the neutral wire output end of the neutral wire line. The output end of the switching power supply socket is used to connect to the AC input end of the switching power supply under test. One end of the first terminal is connected to the DC output end of the switching power supply under test. One end of the second terminal is connected to the negative output line of the switching power supply under test. The other ends of the first terminal and the second terminal are connected to a load.

8. The switching power supply testing device according to claim 7, characterized in that, Heat dissipation holes are provided on the housing.

9. The switching power supply testing device according to claim 7, wherein, Fourth mounting holes are provided on the housing; The second indicator light is disposed in the fourth mounting hole.

10. The switching power supply testing device according to claim 7, characterized in that, The housing is a cube; The first mounting hole, the second mounting hole, the switching power supply socket and the third mounting hole are disposed on the first side surface of the housing. The AC socket is disposed on the second side surface of the housing. The first terminal and the second terminal are disposed on the third side surface of the housing.

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