Control circuit of bypass cabinet

Abstract

The utility model discloses a control circuit of a bypass cabinet, comprising an input control module, one end of which is connected with an external power supply; a primary side coil of the isolation transformer is connected with the other end of the input control module; the change-over switch is connected with a secondary side coil of the isolation transformer, and a normally open contact of the change-over switch is connected with the positive electrode of the load; and one end of the voltage regulating module is connected with the normally closed contact of the change-over switch, the other end of the voltage regulating module is connected with the load, and the voltage value is regulated by the voltage regulating module and then is output to the load. The device is simple in structure, and can automatically guarantee the stability of the output voltage when the power supply voltage of the power distribution network fluctuates or the load changes.

Description

Technical Field

[0001] This utility model relates to the field of bypass cabinet control circuit technology, and in particular to a bypass cabinet control circuit. Background Technology

[0002] Uninterruptible power supplies (UPS) are designed for power plants and substations, primarily providing uninterrupted power to critical loads in power systems. They can be widely used in DC battery panels, power communications, microcomputer monitoring, RTUs, VQCs, and emergency lighting in power systems. They can also provide uninterrupted power to AC lubricating oil pumps, fans, and water pumps.

[0003] Conventional uninterruptible power supplies (UPS) are typically laid out with two cabinets: a main cabinet and a bypass cabinet. When voltage fluctuations occur due to external power supply network voltage fluctuations or load changes, the bypass cabinet cannot automatically maintain a stable output voltage. Summary of the Invention

[0004] This utility model aims to at least partially solve one of the problems existing in the existing related technologies. To this end, this utility model proposes a control circuit for a bypass cabinet, which has a simple structure and can automatically ensure the stability of the output voltage when the power supply voltage of the power distribution network fluctuates or the load changes.

[0005] The above objective is achieved through the following technical solution:

[0006] A control circuit for a bypass cabinet includes:

[0007] An input control module, one end of which is connected to an external power supply;

[0008] An isolation transformer, wherein the primary winding of the isolation transformer is connected to the other end of the input control module;

[0009] A changeover switch is connected to the secondary coil of the isolation transformer, and its normally open contact is connected to the positive terminal of the load.

[0010] A voltage regulating module is provided, with one end connected to the normally closed contact of the changeover switch and the other end connected to the load. The voltage value is adjusted by the voltage regulating module before being output to the load.

[0011] In some embodiments, the voltage regulating module includes a compensation transformer, the first end of the primary winding of the compensation transformer being connected to the normally closed contact of the changeover switch, and the second end of the primary winding being connected to the positive terminal of the load.

[0012] A voltage regulator, first ends of the voltage regulator are connected with the second ends of the primary coil of the compensation transformer and the positive pole of the load respectively, second ends of the voltage regulator are connected with the second ends of the secondary coil of the isolation transformer and the negative pole of the load respectively, a first movable end of the voltage regulator is connected with the first end of the secondary coil of the compensation transformer, and a second movable end of the voltage regulator is connected with the second end of the secondary coil of the compensation transformer.

[0013] In some embodiments, the voltage regulating module further comprises an output switch, one end of the output switch is connected with the second end of the primary coil of the compensation transformer and the first end of the voltage regulator respectively, and the other end of the output switch is connected with the positive pole of the load.

[0014] In some embodiments, the output switch is a normally closed switch.

[0015] In some embodiments, the input control module comprises a first input switch and a second input switch, one end of the first input switch is connected with the positive pole of the power supply, and the other end of the first input switch is connected with the first end of the primary coil of the isolation transformer, one end of the second input switch is connected with the negative pole of the power supply, and the other end of the second input switch is connected with the second end of the primary coil of the isolation transformer.

[0016] Compared with the prior art, the utility model at least has following beneficial effects:

[0017] 1、 the control circuit of the bypass cabinet, simple structure, when the power supply voltage fluctuation or load change of distribution network, can guarantee the stability of output voltage automatically. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the following will briefly introduce the drawing needed to be used in the specific embodiment or the prior art description, obviously, the drawing in the following description is some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0019] Figure 1 It is the circuit schematic diagram of the control circuit of the bypass cabinet in the utility model embodiment. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the following will combine the utility model embodiment, and the technical scheme in the utility model embodiment is clearly and completely described, obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiment.The components of the utility model embodiment can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of the claimed invention.

[0022] Example:

[0023] like Figure 1 As shown, this embodiment provides a control circuit for a bypass cabinet, including:

[0024] Input control module 1, one end of which is connected to an external power supply;

[0025] An isolation transformer T1, wherein the primary winding of the isolation transformer T1 is connected to the other end of the input control module 1;

[0026] A changeover switch ARB is connected to the secondary coil of the isolation transformer T1, and its normally open contact is connected to the positive terminal of the load.

[0027] The voltage regulating module 2 is connected at one end to the normally closed contact of the changeover switch ARB and at the other end to the load. The voltage value is adjusted by the voltage regulating module 2 before being output to the load.

[0028] In this embodiment, based on the change in output voltage, the voltage is directly output to the load via the ARB switch, or the voltage is adjusted by the voltage regulation module 2 before being output to the load. This achieves automatic voltage regulation, enabling the equipment to operate under stable voltage. Its structure is simple, and it can automatically ensure the stability of the output voltage when the power supply voltage of the power distribution network fluctuates or the load changes.

[0029] Furthermore, the voltage regulating module 2 includes a compensation transformer T2, the first end of the primary winding of the compensation transformer T2 is connected to the normally closed contact of the changeover switch ARB, and the second end of its primary winding is connected to the positive terminal of the load.

[0030] The voltage regulator T3 has its first end connected to the second end of the primary winding of the compensation transformer T2 and the positive terminal of the load, and its second end connected to the second end of the secondary winding of the isolation transformer T1 and the negative terminal of the load. Its first movable end is connected to the first end of the secondary winding of the compensation transformer T2, and its second movable end is connected to the second end of the secondary winding of the compensation transformer T2.

[0031] Preferably, the voltage regulating module 2 further comprises an output switch AOB, one end of which is connected with the second end of the primary coil of the compensation transformer T2 and the first end of the voltage regulator T3 respectively, and the other end of which is connected with the positive pole of the load.

[0032] Specifically, the output switch AOB is a normally closed switch.

[0033] In particular, the input control module 1 comprises a first input switch and a second input switch, one end of the first input switch is connected with the positive pole of the power supply, and the other end of the first input switch is connected with the first end of the primary coil of the isolation transformer T1, one end of the second input switch is connected with the negative pole of the power supply, and the other end of the second input switch is connected with the second end of the primary coil of the isolation transformer T1.

[0034] In the embodiment, one end of the input control module 1 is connected with the external power supply to input 380V voltage, then the 380V voltage is converted into 220V voltage through the isolation transformer T1, and then, since the normally open contact of the conversion switch AOB is connected with the positive pole of the load to form a bypass, if the output voltage does not need to be stabilized, the conversion switch AOB is connected with the load through the normally open contact, the 220V voltage is output to the load through the normally open contact, of course, if the output voltage needs to be stabilized, the conversion switch AOB is connected with the voltage regulating module 2 through the normally closed contact, that is, the conversion switch AOB is connected with the first end of the primary coil of the compensation transformer T2 through the normally closed contact, the compensation transformer T2 and the voltage regulator T3 are cooperatively operated to adjust the current voltage, so that the appropriate voltage is obtained, and then the adjusted voltage is output to the load, so that the voltage regulating module can realize the automatic voltage stabilization function according to the change of the output voltage, and the device realizes the voltage stabilization operation, and the structure is simple, when the power supply voltage of the power distribution network fluctuates or the load changes, the stability of the output voltage can be automatically ensured.

[0035] The above only describes some embodiments of the present application. For those skilled in the art, without departing from the creative concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application.

Claims

1. A control circuit for a bypass cabinet, characterized by The utility model relates to a kind of voltage regulator, including: Input control module (1), one end of the input control module (1) is connected with external power supply; Isolation transformer, the primary coil of the isolation transformer is connected with the other end of the input control module (1); Switching switch, the switching switch is connected with the secondary coil of the isolation transformer, and the normally open contact thereof is connected with the positive pole of load; Voltage regulating module (2), one end of the voltage regulating module (2) is connected with the normally closed contact of the switching switch, and the other end is connected with the load, and the voltage value is adjusted by the voltage regulating module (2) and then output to the load.

2. A control circuit for a bypass cabinet according to claim 1, characterised in that, The voltage regulating module (2) includes compensation transformer, the first end of the primary coil of the compensation transformer is connected with the normally closed contact of the switching switch, and the second end of the primary coil thereof is connected with the positive pole of the load; Voltage regulator, the first end of the voltage regulator is respectively connected with the second end of the primary coil of the compensation transformer, the positive pole of the load, and the second end thereof is respectively connected with the second end of the secondary coil of the isolation transformer, the negative pole of the load, and the first active end thereof is connected with the first end of the secondary coil of the compensation transformer, and the second active end thereof is connected with the second end of the secondary coil of the compensation transformer.

3. A control circuit for a bypass cabinet according to claim 2, characterised in that, The voltage regulating module (2) further includes output switch, one end of the output switch is respectively connected with the second end of the primary coil of the compensation transformer, the first end of the voltage regulator, and the other end thereof is connected with the positive pole of the load.

4. A control circuit for a bypass cabinet according to claim 3, characterised in that, The output switch is normally closed switch.

5. The control circuit for a bypass cabinet of claim 1, wherein, The input control module (1) includes first input switch and second input switch, wherein one end of the first input switch is connected with the positive pole of power supply, and the other end thereof is connected with the first end of the primary coil of the isolation transformer, one end of the second input switch is connected with the negative pole of the power supply, and the other end thereof is connected with the second end of the primary coil of the isolation transformer.

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