Test power supply circuit

Abstract

The utility model relates to the field of test power supplies, and particularly discloses a test power supply circuit, which is provided with a transformer, a plurality of output interfaces with different voltage classes are arranged on the transformer, the output end of the transformer is provided with a multi-gear switch, and the multi-gear switch is rotated to correspond to the output interfaces with different voltage classes. In addition, a bridge type rectification unit is further arranged, two switches are arranged at the input end of the output unit, the output unit is directly closed with the output end of the transformer by adjusting the switches, and then alternating current voltage can be output. And the adjusting switch is directly closed with the output end of the bridge rectifier unit, and direct-current voltage can be directly output, so that alternating-current and direct-current switching output can be realized, the convenience during maintenance work is greatly improved, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of test power supplies, and particularly relates to a test power supply circuit. Background Art

[0002] When repairing some devices, a test power supply is often needed to power them on for testing. However, when facing different types of devices, corresponding test power supplies are required. Usually, the test power supply generally uses an external 220V civil power supply. When different voltages are needed, sometimes a transformer is required to step down to 110V or step up to 380V for use. And sometimes special voltage levels are needed, but a test power supply suitable for that voltage cannot be provided, so it will cause inconvenience in use. And sometimes when DC power supply is needed for the servo repair powered by the bus, only the bus can be drawn from another frequency converter to be used as the power supply, thus greatly reducing the work efficiency and increasing the complexity of the work.

[0003] The technical problem to be solved by this application is: to design a test power supply circuit that can meet the voltage requirements of various test devices and can switch between AC and DC. Content of the Utility Model

[0004] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide a test power supply circuit that can meet the voltage requirements of various test devices and can switch between AC and DC.

[0005] The technical solution adopted by the utility model is: a test power supply circuit, including

[0006] A transformer T, the transformer T is provided with a plurality of output interfaces with different voltage levels, the output end of the transformer T is connected with a multi-position switch S1, and the multi-position switch S1 is connected with different output interfaces to control the output of different voltage levels;

[0007] A bridge rectifier unit BR, the input end of the bridge rectifier unit BR is connected with the output end of the transformer T to convert alternating current into direct current;

[0008] An output unit OUT, the output unit OUT includes a switch K1 and a switch K2, the two stationary ends of the switch K1 and the switch K2 are respectively connected with the output end of the transformer T and the output end of the bridge rectifier unit BR to control the output of alternating current or direct current, the output end of the output unit OUT is connected to a load, the moving end of the switch K1 is connected to the positive pole of the load, and the moving end of the switch K2 is connected to the negative pole of the load.

[0009] In some embodiments, the bridge rectifier unit BR includes a diode D1, a diode D2, a diode D3, and a diode D4 respectively. The positive electrode of the diode D1 is connected to the output terminal of the multi - position switch S1. The negative electrodes of the diode D1 and the diode D2 are both connected to the positive electrode of the output unit OUT. The negative electrodes of the diode D3 and the diode D4 are both connected to the negative output terminal of the transformer T. The positive electrodes of the diode D3 and the diode D4 are both connected to the negative electrode of the output unit OUT.

[0010] In some embodiments, the transformer T is an isolation transformer. The transformer T is further provided with a low - voltage output interface. The low - voltage output interface is connected to a rectification module D5. The rectification module D5 is connected in parallel with a capacitor C1. The output terminal of the rectification module D5 is connected to a relay J. An indication unit is connected between the rectification module D5 and the relay J.

[0011] In some embodiments, the indication unit includes a current - limiting switch S2 connected in series with one end of the relay J, and an indicator lamp LED and a current - limiting resistor R1 connected in parallel with the current - limiting switch S2.

[0012] In some embodiments, the negative electrodes of the diode D1 and the diode D2 are connected to the positive electrodes of the diode D3 and the diode D4 in sequence after being connected in series with a capacitor C2, a capacitor C3, and a capacitor C4. The capacitor C2, the capacitor C3, and the capacitor C4 are respectively provided with corresponding parallel resistors R2, R3, and R4.

[0013] In some embodiments, an AC voltmeter V1 is connected in parallel with the output terminal of the transformer T.

[0014] In some embodiments, a DC voltmeter V2 is connected in parallel with the output terminal of the bridge rectifier unit BR. An isolation power supply module QS is connected in series between the low - voltage output interface of the transformer T and the DC voltmeter V2. A switch K3 is connected in series between the isolation power supply module QS and the low - voltage output interface of the transformer T. The moving end of the switch K3 is connected to the low - voltage output interface of the transformer T. The two stationary ends of the switch K3 are respectively connected to the AC voltmeter V1 and the input terminal of the isolation power supply module QS.

[0015] In some embodiments, a current - limiting incandescent lamp B connected in series with a switch K2 is provided in the output unit OUT.

[0016] The utility model has the following technical effects: By providing a transformer with several output interfaces of different voltage levels, and a multi-position switch is provided at the output end of the transformer. By rotating the multi-position switch, it corresponds to the output interfaces of different voltage levels, and thus the output of different voltage levels can be realized. Therefore, it can meet the voltage requirements of different maintenance equipment. In addition, a bridge rectifier unit is provided, and two switches are respectively provided at the input end of the output unit. By adjusting the switches to directly close with the output end of the transformer, an AC voltage can be output. By adjusting the switches to directly close with the output end of the bridge rectifier unit, a DC voltage can be directly output. Thus, the switching output of AC and DC can be realized, which greatly improves the convenience during maintenance work and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic circuit diagram of the test power supply of the utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0019] Please refer to Figure 1 , the present utility model provides a technical solution: A test power supply circuit includes a transformer T, and several output interfaces of different voltage levels are provided on the transformer T. Each output interface outputs a different voltage, including voltage levels of 50V, 110V, 220V, 380V, and 500V, which can meet the voltage requirements of various maintenance equipment. A spare voltage gear is also provided on the transformer T, and a multi-position switch S1 is provided at the positive pole of the output end of the transformer T. By adjusting the multi-position switch S1 to close with different output interfaces, the output of different voltage levels can be controlled.

[0020] It also includes a bridge rectifier unit BR. The input end of the bridge rectifier unit BR is connected to the output end of the transformer T. The bridge rectifier unit BR can convert the alternating current of the transformer T into direct current for output. The bridge rectifier unit BR includes a diode D1, a diode D2, a diode D3, and a diode D4 respectively. The positive electrode of the diode D1 is connected to the output end of the multi - gear switch S1, and the negative electrodes of the diode D1 and the diode D2 are both connected to the positive electrode of the output unit OUT. A capacitor C2, a capacitor C3, and a capacitor C4 are connected in series in sequence to the negative electrode of the diode D1. Moreover, resistors R2, R3, and R4 are respectively connected in parallel to the capacitor C2, the capacitor C3, and the capacitor C4. The output end of the capacitor C4 is connected to the positive electrodes of the diode D3 and the diode D4. The negative electrodes of the diode D3 and the diode D4 are both connected to the negative electrode of the output end of the transformer T, and the positive electrodes of the diode D3 and the diode D4 are both connected to the negative electrode of the output unit OUT. When the circuit in the bridge rectifier unit BR is in the positive half - cycle, the diode D1 and the diode D3 are turned on, so as to guide the current to pass through the resistor R2, the resistor R3, and the resistor R4 in sequence from top to bottom. When the circuit in the bridge rectifier unit BR is in the negative half - cycle, the diode D1, the diode D2, and the diode D4 are turned on, so as to also guide the current to pass through the resistor R2, the resistor R3, and the resistor R4 in sequence from top to bottom, thereby realizing full - wave rectification, and further realizing the conversion of the alternating voltage of the transformer T into direct - current voltage for output.

[0021] The transformer T is an isolation transformer, in which the output end and the live wire are isolated from each other, thus reducing the electric shock risk caused by accidental contact. The transformer T is also provided with a low - voltage output interface. The low - voltage output interface is connected to a rectification module D5. The rectification module D5 is connected in parallel with the capacitor C1. The output end of the rectification module D5 is connected to a relay J. The rectification module D5 can convert the alternating voltage output from the low - voltage output interface into direct - current voltage for the use of the relay J.

[0022] It further includes an output unit OUT. The output unit OUT includes a switch K1 and a switch K2. The two fixed terminals of the switch K1 and the switch K2 are respectively connected to the output terminal of the transformer T and the output terminal of the bridge rectifier unit BR, so as to control the output of AC voltage or DC voltage. The output terminal of the output unit OUT is connected to a load. The moving terminal of the switch K1 is connected to the positive pole of the load, and the moving terminal of the switch K2 is connected to the negative pole of the load. A switch K3 is also connected to the low-voltage output interface of the transformer T. The switch K1, the switch K2 and the switch K3 are triple switches, so the switch K1, the switch K2 and the switch K3 are synchronously linked. Therefore, by adjusting the triple switch, a closed loop can be respectively formed between the switch K1, the switch K2 and the switch K3 and the positive and negative poles of the output terminal of the transformer T, so that the triple switch forms a closed loop between the transformer T and the output unit OUT, and then the output of AC voltage can be realized. When the switch K1, the switch K2 and the switch K3 are respectively closed with the output terminal of the bridge rectifier unit BR, a closed loop can be formed among the transformer T, the bridge rectifier unit BR and the output unit OUT, so that the output of DC voltage can be realized.

[0023] An indicating unit is connected between the rectifying module D5 and the relay J. The input end of the indicating unit is connected to the output end of the rectifying module D5. The indicating unit includes a current-limiting switch S2 connected in series with the output end of the relay J, an indicator lamp LED and a current-limiting resistor R1 connected in parallel with the current-limiting switch S2. The start and stop of the relay J can be controlled by disconnecting or closing the current-limiting switch S2. When the current-limiting switch S2 is disconnected, the indicator lamp LED lights up, indicating that the relay J is in the stop state. When the current-limiting switch S2 is closed, the indicator lamp LED is in the off state, indicating that the relay J is in the working state.

[0024] An AC voltmeter V1 is connected in parallel with the output terminal of the transformer T, and a DC voltmeter V2 is connected in parallel with the output terminal of the bridge rectifier unit BR. An isolation power supply module QS is connected in series between the low-voltage output interface of the transformer T and the DC voltage converter V2. The isolation power supply module QS is connected in series with a switch K3 to the low-voltage output interface of the transformer T. The moving terminal of the switch K3 is connected to the low-voltage output interface of the transformer T, and the two fixed terminals of the switch K3 are respectively connected to the AC voltmeter V1 and the input end of the isolation power supply module QS.

[0025] A current-limiting incandescent lamp B is also provided in series with the switch K2 at an output port in the output unit OUT. By providing the current-limiting incandescent lamp B, it is possible to know whether the device is short-circuited or discharging through the voltage drop and brightness of the current-limiting incandescent lamp B when the condition of the unknown device is not known.

[0026] The circuit principle of the present utility model:

[0027] Advantages of the present utility model: By providing a transformer with several output interfaces of different voltage levels, and a multi-position switch is provided at the output end of the transformer. By rotating the multi-position switch to correspond to the output interfaces of different voltage levels, the output of different voltage levels can be realized. Therefore, it can meet the voltage requirements of different maintenance equipment. In addition, a bridge rectifier unit is provided, and two switches are respectively provided at the input end of the output unit. By adjusting the switches to directly close with the output end of the transformer, an alternating voltage can be output. By adjusting the switches to directly close with the output end of the bridge rectifier unit, a direct current voltage can be directly output. Thus, the switching output of alternating current and direct current can be realized, which greatly improves the convenience during maintenance work and improves work efficiency.

[0028] Finally, it should be noted that the above are only preferred examples of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A test power supply circuit, characterized in that: include: A transformer T, wherein the transformer T is provided with a plurality of output interfaces of different voltage levels, and the output end of the transformer T is connected to a multi-level switch S1, and the multi-level switch S1 is connected to different output interfaces to control outputs of different voltage levels; A bridge rectifier unit BR, the input end of the bridge rectifier unit BR is connected to the output end of the transformer T for converting AC power into DC power; The output unit OUT includes a switch K1 and a switch K2. The two fixed ends of the switch K1 and the switch K2 are respectively connected to the output end of the transformer T and the output end of the bridge rectifier unit BR, and are used to control the output of AC or DC power. The output end of the output unit OUT is connected to a load, the moving end of the switch K1 is connected to the positive electrode of the load, and the moving end of the switch K2 is connected to the negative electrode of the load.

2. The test power supply circuit according to claim 1, characterized in that: The bridge rectifier unit BR includes a diode D1, a diode D2, a diode D3 and a diode D4, respectively. The anode of the diode D1 is connected to the output end of the multi-speed switch S1, the cathodes of the diode D1 and the diode D2 are connected to the anode of the output unit OUT, the cathodes of the diode D3 and the diode D4 are connected to the cathode of the output end of the transformer T, and the anodes of the diode D3 and the diode D4 are connected to the cathode of the output unit OUT.

3. The test power supply circuit according to claim 1, characterized in that: The transformer T is an isolation transformer, and is also provided with a low-voltage output interface, which is connected to a rectifier module D5, which is connected in parallel with a capacitor C1, and an output end of the rectifier module D5 is connected to a relay J, and an indication unit is connected between the rectifier module D5 and the relay J.

4. The test power supply circuit according to claim 3, characterized in that: The indicating unit includes a current limiting switch S2 connected in series with one end of the relay J, and an indicator light LED and a current limiting resistor R1 connected in parallel with the current limiting switch S2.

5. The test power supply circuit according to claim 2, characterized in that: The cathodes of the diodes D1 and D2 are connected in series with capacitors C2, C3 and C4 in sequence, and then connected to the anodes of the diodes D3 and D4. The capacitors C2, C3 and C4 are respectively provided with resistors R2, R3 and R4 connected in parallel with them.

6. The test power supply circuit according to claim 1, characterized in that: The output end of the transformer T is connected in parallel to an AC voltmeter V1.

7. The test power supply circuit according to claim 6, characterized in that: The output end of the bridge rectifier unit BR is connected in parallel to a DC voltmeter V2, an isolated power supply module QS is connected in series between the low-voltage output interface of the transformer T and the DC voltmeter V2, a switch K3 is connected in series between the isolated power supply module QS and the low-voltage output interface of the transformer T, a moving end of the switch K3 is connected to the low-voltage output interface of the transformer T, and two fixed ends of the switch K3 are respectively connected to the AC voltmeter V1 and the input end of the isolated power supply module QS.

8. The test power supply circuit according to claim 1, characterized in that: The output unit OUT is provided with a current-limiting incandescent lamp B connected in series with the switch K2.

Images