Online maintenance circuit of voltage stabilizer and voltage stabilizer

Abstract

The utility model provides an online maintenance circuit of a voltage stabilizer and the voltage stabilizer. The circuit comprises a first switch, a switch control sub-circuit and second switches in one-to-one correspondence with compensation transformers. The first input end of the switch control sub-circuit is used for inputting an online maintenance control signal, the second input end of the switch control sub-circuit is used for inputting an auxiliary power supply power failure detection signal, and the output end of the switch control sub-circuit is connected with the control end of the first switch; wherein when the online maintenance control signal or the auxiliary power supply power failure detection signal is valid, the first switch is kept in a closed state; the first end of the first switch is connected with the output live wire end of the voltage stabilizer, and the second end of the first switch is connected with the control end of the second switch; the second switch is connected between any two wiring terminals of the primary winding of the corresponding compensation transformer; according to the utility model, on-line maintenance of the voltage stabilizer can be realized, and the situation that the uninterruptible power supply cannot supply power normally due to power failure of the voltage stabilizer is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of voltage stabilization, and in particular relates to an online maintenance circuit of a voltage stabilizer and a voltage stabilizer. Background Art

[0002] A voltage stabilizer is an electrical device that adjusts and controls the voltage. Within a specified voltage input range, the voltage can be adjusted to stabilize the output voltage within a specified range. A voltage stabilizer can be used in the bypass of an uninterruptible power supply, stabilizing the input mains voltage and outputting a bypass power supply that meets the voltage accuracy.

[0003] The voltage stabilizer includes a compensation transformer and an adjustment circuit for adjusting the compensation voltage of the compensation transformer. When the adjustment circuit fails, it needs to be repaired or replaced. At present, the adjustment circuit is usually repaired or replaced after the voltage stabilizer is powered off. However, the power failure of the voltage stabilizer will affect the bypass power supply of the uninterruptible power supply, which may cause the uninterruptible power supply to fail to supply power normally. Utility Model Content

[0004] In view of this, an embodiment of the utility model provides an online maintenance circuit of a voltage stabilizer and a voltage stabilizer to solve the problem that the uninterruptible power supply may not be able to supply power normally during the power-off maintenance of the adjustment circuit.

[0005] A first aspect of an embodiment of the utility model provides an online maintenance circuit of a voltage stabilizer, the voltage stabilizer comprising at least one compensation transformer and an adjustment circuit for adjusting a compensation voltage of the compensation transformer;

[0006] The online maintenance circuit includes a first switch, a switch control subcircuit, and a second switch corresponding to the compensation transformer in a one-to-one manner;

[0007] The first input end of the switch control subcircuit is used to input an online maintenance control signal, the second input end of the switch control subcircuit is used to input an auxiliary power supply power-off detection signal, and the output end of the switch control subcircuit is connected to the control end of the first switch; wherein, when the online maintenance control signal or the auxiliary power supply power-off detection signal is valid, the first switch remains in a closed state;

[0008] A first end of the first switch is connected to an output live wire end of the voltage regulator, and a second end of the first switch is connected to a control end of the second switch;

[0009] The second switch is connected between any two connection terminals of the primary winding of the corresponding compensation transformer; the switching state of the second switch is consistent with the switching state of the first switch.

[0010] In some possible implementations, the first switch includes a relay;

[0011] A first end of the coil of the relay is connected to the control end of the first switch, a second end of the coil of the relay is used to connect to the first voltage terminal, a first switch contact of the relay is connected to the first end of the first switch, and a second switch contact of the relay is connected to the second end of the first switch;

[0012] When the coil of the relay is not energized, the first switch contact of the relay and the second switch contact of the relay are in a closed state.

[0013] In some possible implementations, the second switch includes a contactor;

[0014] The first end of the coil of the contactor is connected to the control end of the second switch, the second end of the coil of the contactor is connected to the neutral line end of the voltage stabilizer, and the first switch contact of the contactor and the second switch contact of the contactor are connected between any two connection terminals of the primary winding of the corresponding compensation transformer;

[0015] When the coil of the contactor is energized, the first switch contact of the contactor and the second switch contact of the contactor are in a closed state.

[0016] In some possible implementations, the switch control subcircuit includes an AND gate module and a NOT gate module;

[0017] The first input end of the AND gate module is connected to the first input end of the switch control subcircuit, the second input end of the AND gate module is connected to the second input end of the switch control subcircuit, and the output end of the AND gate module is connected to the input end of the NOT gate module;

[0018] The output end of the NOT gate module is connected to the output end of the switch control subcircuit.

[0019] In some possible implementations, the NOT gate module includes a NOT gate and a first resistor;

[0020] The input end of the NOT gate is connected to the input end of the NOT gate module, the output end of the NOT gate is connected to the output end of the NOT gate module, and the output end of the NOT gate is also connected to the first voltage terminal through the first resistor.

[0021] In some possible implementations, the NOT gate module further includes a second resistor and a third resistor connected in parallel;

[0022] The output end of the NOT gate is connected to the output end of the NOT gate module through the second resistor and the third resistor which are connected in parallel.

[0023] In some possible implementations, the AND gate module includes a first AND gate and a fourth resistor;

[0024] The first input end of the first AND gate is connected to the first input end of the AND gate module, the second input end of the first AND gate is connected to the second input end of the AND gate module through a fourth resistor, and the output end of the first AND gate is connected to the output end of the AND gate module.

[0025] In some possible implementations, the AND gate module further includes a second AND gate and a fifth resistor;

[0026] The output end of the first AND gate is connected to the first input end of the second AND gate, the failure signal of the controller is input to the second input end of the second AND gate through the fifth resistor, and the output end of the second AND gate is connected to the output end of the AND gate module;

[0027] The regulating circuit is controlled by a controller.

[0028] In some possible implementations, the switch control subcircuit further includes a diode;

[0029] The anode of the diode is connected to the output end of the NOT gate module, and the cathode of the diode is used to connect to the first voltage terminal.

[0030] A second aspect of an embodiment of the utility model provides a voltage stabilizer, comprising an online maintenance circuit of the voltage stabilizer as described in the first aspect or any possible implementation manner of the first aspect.

[0031] The online maintenance circuit of the voltage stabilizer provided in this embodiment includes a first switch, a switch control subcircuit and a second switch corresponding to the compensation transformer of the voltage stabilizer one by one; the switch control subcircuit controls the state of the first switch based on the online maintenance control signal and the auxiliary power supply power-off detection signal, and the state of the first switch affects the state of the second switch. When the online maintenance control signal or the auxiliary power supply power-off detection signal is valid, it means that the voltage stabilizer needs to be maintained online or the auxiliary power supply is powered off, and the control circuit of the adjustment circuit cannot be powered, and the adjustment circuit cannot work normally. At this time, the first switch is controlled to remain in a closed state, and then each second switch is also in a closed state, so that the primary winding of the compensation transformer is short-circuited. At this time, the adjustment circuit can be maintained, and the voltage stabilizer is still in an online working state, so that online maintenance of the voltage stabilizer can be achieved. During the online maintenance, the voltage stabilizer is not powered off, which can avoid the situation where the uninterruptible power supply cannot be powered normally due to the power off of the voltage stabilizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0033] Figure 1 It is a structural schematic diagram of an online maintenance circuit of a voltage stabilizer provided by an embodiment of the utility model;

[0034] Figure 2 The structure of the switch control subcircuit provided by the embodiment of the utility model is schematically shown in FIG. Figure 1 ;

[0035] Figure 3 The structure of the switch control subcircuit provided by the embodiment of the utility model is schematically shown in FIG. Figure 2 ;

[0036] Figure 4 It is a structural schematic diagram of a voltage stabilizer provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0037] In the following description, specific details such as specific system structures and technologies are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details that hinder the description of the present invention.

[0038] In order to illustrate the technical solution of the present utility model, specific embodiments are provided below for illustration.

[0039] See also Figure 1 , the embodiment of the utility model provides an online maintenance circuit of a voltage stabilizer, wherein the voltage stabilizer includes at least one compensation transformer T1 and an adjustment circuit 21 for adjusting the compensation voltage of the compensation transformer T1;

[0040] The online maintenance circuit of the voltage stabilizer includes a first switch 11, a switch control subcircuit 12, and a second switch 13 corresponding to the compensation transformer T1 one by one;

[0041] The first input end of the switch control subcircuit 12 is used to input the online maintenance control signal X1, the second input end of the switch control subcircuit 12 is used to input the auxiliary power supply power-off detection signal X2, and the output end of the switch control subcircuit 12 is connected to the control end of the first switch 11; wherein, when the online maintenance control signal X1 or the auxiliary power supply power-off detection signal X2 is valid, the first switch 11 remains in a closed state;

[0042] A first end of the first switch 11 is connected to an output live wire terminal L of the voltage regulator, and a second end of the first switch 11 is connected to a control end of the second switch 13;

[0043] The second switch 13 is connected between any two terminals of the primary winding of the corresponding compensation transformer T1 ; the switching state of the second switch 13 is consistent with the switching state of the first switch 11 .

[0044] See also Figure 1 The voltage stabilizer includes at least one compensation transformer T1 and an adjustment circuit 21. The adjustment circuit 21 is used to adjust the compensation voltage of each compensation transformer T1. The secondary winding of each compensation transformer T1 is connected in series between the input live wire terminal Lin of the voltage stabilizer and the output live wire terminal L of the voltage stabilizer, and each connection terminal of the primary winding of each compensation transformer T1 is connected to the adjustment circuit 21, and the adjustment circuit 21 is also connected to the output live wire terminal L of the voltage stabilizer and the neutral wire terminal N of the voltage stabilizer.

[0045] In some possible implementations, see Figure 1 , the voltage regulator may also include an isolation transformer T2, an input switch SW1 and an output switch SW2. The primary winding of the isolation transformer T2 is connected to the AC input through the input switch SW1, and the secondary winding of the isolation transformer T2 is respectively connected to the input live wire terminal Lin of the voltage regulator and the neutral wire terminal N of the voltage regulator. Each device, module, unit, circuit or terminal connected to the output live wire terminal L of the voltage regulator is connected to the output live wire terminal L of the voltage regulator through the output switch SW2. For example, the secondary windings of each compensation transformer T1 are connected in series and then connected to the output live wire terminal L of the voltage regulator through the output switch SW2, and the adjustment circuit 21 is connected to the output live wire terminal L of the voltage regulator through the output switch SW2, and so on.

[0046] In this embodiment, the structures of different compensation transformers T1 may be the same or different. For example, Figure 1 The invention comprises two compensating transformers T1 with different structures, wherein the primary winding of one compensating transformer T1 has three connecting terminals, and the primary winding of the other compensating transformer T1 has two connecting terminals.

[0047] This embodiment does not impose any specific restrictions on the number of compensation transformers T1 in the voltage stabilizer and the number of connection terminals of the primary windings of each compensation transformer T1, which can be set according to actual needs. Figure 1 The example of a voltage regulator including two compensation transformers T1 is merely given, and is not intended to be limiting.

[0048] See also Figure 1The online maintenance circuit of the voltage stabilizer includes a first switch 11, a switch control subcircuit 12, and second switches 13 corresponding to the compensation transformers T1. The control end of each second switch 13 is connected to the second end of the first switch 11. The primary winding of the compensation transformer T1 can have two connection terminals, three connection terminals, four connection terminals, or even more connection terminals, and the second switch 13 is connected between any two connection terminals of the primary winding of the corresponding compensation transformer T1.

[0049] The first switch 11 may be a normally closed switch, and the second switch 13 may be a normally open switch.

[0050] The switch control subcircuit 12 can control the state of the first switch 11 according to the online maintenance control signal X1 and the auxiliary power failure detection signal X2. The switch state of the first switch 11 affects the switch state of the second switch 13.

[0051] The online maintenance control signal X1 is a control signal sent by the controller, which is used to indicate whether to perform online maintenance on the voltage stabilizer. When it is valid, it indicates that the voltage stabilizer is to be maintained online, and when it is invalid, it indicates that the voltage stabilizer is not to be maintained online. When the staff needs to perform online maintenance on the voltage stabilizer, they can input an online maintenance instruction, and the controller generates a valid online maintenance control signal X1 according to the online maintenance instruction.

[0052] The auxiliary power supply power-off detection signal X2 is used to indicate whether the auxiliary power supply is powered off. When it is valid, it indicates that the auxiliary power supply is powered off, and when it is invalid, it indicates that the auxiliary power supply is not powered off. The auxiliary power supply is used to power the control circuit of the voltage regulator, specifically, it can power the control circuit of the adjustment circuit 21. When it is powered off, the drive of the adjustment circuit 21 fails, and the adjustment circuit 21 can no longer be controlled. The adjustment circuit 21 loses its function and needs to be short-circuited.

[0053] When the online maintenance control signal X1 is valid or the auxiliary power supply power-off detection signal X2 is valid, the switch control subcircuit 12 can control the first switch 11 to remain in a closed state, thereby affecting each second switch 13, so that each second switch 13 is closed, and the primary winding of the compensation transformer T1 is short-circuited. At this time, the adjustment circuit 21 no longer works in the voltage stabilizer and can be repaired or replaced, while the voltage stabilizer is still powered and will not be powered off. When the online maintenance control signal X1 is valid and the auxiliary power supply power-off detection signal X2 is invalid, the switch control subcircuit 12 controls the first switch 11 to be disconnected, thereby affecting each second switch 13, so that each second switch 13 is disconnected. At this time, the adjustment circuit 21 can work normally and adjust the compensation voltage of the compensation transformer T1.

[0054] Exemplarily, the online maintenance control signal X1 and the auxiliary power failure detection signal X2 may be valid at a low level and invalid at a high level, or vice versa, that is, valid at a high level and invalid at a low level.

[0055] The online maintenance circuit of the voltage stabilizer provided in this embodiment includes a first switch 11, a switch control subcircuit 12 and a second switch 13 corresponding to the compensation transformer T1 of the voltage stabilizer one by one; the switch control subcircuit 12 controls the state of the first switch 11 based on the online maintenance control signal X1 and the auxiliary power supply power-off detection signal X2, and the state of the first switch 11 affects the state of the second switch 13. When the online maintenance control signal X1 or the auxiliary power supply power-off detection signal X2 is valid, it means that the voltage stabilizer needs to be maintained online or the auxiliary power supply is powered off, and the control circuit of the adjustment circuit 21 cannot be powered, and the adjustment circuit 21 cannot work normally. At this time, the first switch 11 is controlled to remain in a closed state, and then each second switch 13 is also in a closed state, so that the primary winding of the compensation transformer T1 is short-circuited. At this time, the adjustment circuit 21 can be maintained, and the voltage stabilizer is still in an online working state, so that online maintenance of the voltage stabilizer can be achieved. During the online maintenance, the voltage stabilizer is not powered off, which can avoid the situation where the uninterruptible power supply cannot be powered normally due to the power off of the voltage stabilizer.

[0056] In some embodiments, see Figure 1 and Figure 2 , the first switch 11 includes a relay K;

[0057] A first end of the coil of the relay K is connected to the control end of the first switch 11, a second end of the coil of the relay K is used to connect to the first voltage terminal V1, a first switch contact of the relay K is connected to the first end of the first switch 11, and a second switch contact of the relay K is connected to the second end of the first switch 11;

[0058] When the coil of relay K is not energized, the first switch contact of relay K and the second switch contact of relay K are in a closed state, and at this time, the first switch 11 is in a closed state. When the coil of relay K is energized, the first switch contact of relay K and the second switch contact of relay K are in an open state, and at this time, the first switch 11 is in an open state.

[0059] The first voltage terminal V1 can provide a voltage of 12V.

[0060] In some embodiments, see Figure 1 , the second switch 13 includes a contactor P;

[0061] The first end of the coil of the contactor P is connected to the control end of the second switch 13, the second end of the coil of the contactor P is connected to the neutral terminal N of the voltage regulator, and the first switch contact of the contactor P and the second switch contact of the contactor P are connected between any two connection terminals of the primary winding of the corresponding compensation transformer T1;

[0062] When the coil of the contactor P is energized, the first switch contact of the contactor P and the second switch contact of the contactor P are in a closed state, and at this time, the second switch 13 is in a closed state. When the coil of the contactor P is not energized, the first switch contact of the contactor P and the second switch contact of the contactor P are in an open state, and at this time, the second switch 13 is in an open state.

[0063] See also Figure 1 The first switch contact of the contactor P and the second switch contact of the contactor P are respectively connected to any two connection terminals of the primary winding of the corresponding compensation transformer T1.

[0064] When the relay K is in the closed state, the coil of the contactor P is energized, and then the first switch contact of the contactor P and the second switch contact of the contactor P are closed, so that the primary winding of the compensation transformer T1 is short-circuited. When the relay K is in the open state, the coil of the contactor P is de-energized, and then the first switch contact of the contactor P and the second switch contact of the contactor P are disconnected, and the primary winding of the compensation transformer T1 works normally.

[0065] In some embodiments, see Figure 2 and Figure 3 , the switch control subcircuit 12 includes an AND gate module 121 and a NOT gate module 122;

[0066] The first input terminal of the AND gate module 121 is connected to the first input terminal of the switch control subcircuit 12, the second input terminal of the AND gate module 121 is connected to the second input terminal of the switch control subcircuit 12, and the output terminal of the AND gate module 121 is connected to the input terminal of the NOT gate module 122;

[0067] The output end of the NOT gate module 122 is connected to the output end of the switch control sub-circuit 12 .

[0068] In some embodiments, see Figure 2 , the NOT gate module 122 includes a NOT gate IC3 and a first resistor R1;

[0069] The input end of the NOT gate IC3 is connected to the input end of the NOT gate module 122 , the output end of the NOT gate IC3 is connected to the output end of the NOT gate module 122 , and the output end of the NOT gate is also connected to the first voltage terminal V1 through the first resistor R1 .

[0070] In some embodiments, see Figure 3, the NOT gate module 122 further includes a second resistor R2 and a third resistor R3 connected in parallel;

[0071] The output end of the NOT gate IC3 is connected to the output end of the NOT gate module 122 through the second resistor R2 and the third resistor R3 connected in parallel.

[0072] In some embodiments, see Figure 2 , the AND gate module 121 includes a first AND gate IC1 and a fourth resistor R4;

[0073] The first input terminal of the first AND gate IC1 is connected to the first input terminal of the AND gate module 121 , the second input terminal of the first AND gate IC1 is connected to the second input terminal of the AND gate module 121 through the fourth resistor R4 , and the output terminal of the first AND gate IC1 is connected to the output terminal of the AND gate module 121 .

[0074] See also Figure 2 When the online maintenance control signal X1 is valid (i.e., low level) or the auxiliary power supply power-off detection signal X2 is valid (i.e., low level), the AND gate module 121 outputs a low level, which is changed to a high level through the NOT gate module 122. At this time, the coil of relay K is not energized, and relay K remains in a closed state. At the same time, the coil of contactor P is energized, and contactor P is in a closed state. When both the online maintenance control signal X1 and the auxiliary power supply power-off detection signal X2 are invalid (i.e., both are high level), the AND gate module 121 outputs a high level, which is changed to a low level through the NOT gate module 122. At this time, the coil of relay K is energized, and relay K is disconnected. At the same time, the coil of contactor P is de-energized, and contactor P is disconnected.

[0075] In some embodiments, see Figure 3 , the AND gate module 121 further includes a second AND gate IC2 and a fifth resistor R5;

[0076] The output end of the first AND gate IC1 is connected to the first input end of the second AND gate IC2, the failure signal X3 of the controller is input to the second input end of the second AND gate IC2 through the fifth resistor R5, and the output end of the second AND gate IC2 is connected to the output end of the AND gate module 121;

[0077] The regulating circuit 21 is controlled by the controller.

[0078] When the controller fails, the controller can no longer control the adjustment circuit 21 , and therefore, the adjustment circuit 21 needs to be short-circuited via the second switch 13 .

[0079] When the failure signal X3 of the controller is valid, it indicates that the controller has failed, and when the failure signal X3 of the controller is invalid, it indicates that the controller has not failed.

[0080] In this embodiment, when any one of the online maintenance control signal X1, the auxiliary power failure detection signal X2, and the controller failure signal X3 is valid, the first switch 11 and the second switch 13 are both closed. When the online maintenance control signal X1, the auxiliary power failure detection signal X2, and the controller failure signal X3 are all invalid, the first switch 11 and the second switch 13 are both opened.

[0081] See also Figure 3 When any one of the online maintenance control signal X1, the auxiliary power failure detection signal X2 and the controller failure signal X3 is valid (i.e., low level), the AND gate module 121 outputs a low level, which is changed to a high level after passing through the NOT gate module 122. At this time, the coil of relay K is not energized, and relay K remains in a closed state. At the same time, the coil of contactor P is energized, and contactor P is in a closed state. When the online maintenance control signal X1, the auxiliary power failure detection signal X2 and the controller failure signal X3 are all invalid (i.e., all are high level), the AND gate module 121 outputs a high level, which is changed to a low level after passing through the NOT gate module 122. At this time, the coil of relay K is energized, and relay K is disconnected. At the same time, the coil of contactor P is de-energized, and contactor P is disconnected.

[0082] In some embodiments, see Figure 3 , the switch control subcircuit 12 further includes a diode D1;

[0083] The anode of the diode D1 is connected to the output end of the NOT gate module 122 , and the cathode of the diode D1 is used to connect to the first voltage terminal V1 .

[0084] Diode D1 is connected in parallel with the coil of relay K.

[0085] In some possible implementations, see Figure 3 The switch control subcircuit 12 may further include a sixth resistor R6 and a light emitting diode D2 connected in series; the sixth resistor R6 and the light emitting diode D2 are connected in series and then connected in parallel with the diode D1.

[0086] The light emitting diode D2 can be used as an indicator light. When online maintenance is performed, the light emitting diode D2 emits light. When online maintenance is not performed, the light emitting diode D2 does not emit light.

[0087] In some possible implementations, the first end of the first switch 11 may be connected to the output live wire terminal L of the voltage regulator through a terminal. The online maintenance circuit may further include a capacitor, which is connected in parallel with the terminal.

[0088] In some possible implementations, see Figure 4 The adjustment circuit 21 may include a switch module 211 and a compensation module 212 .

[0089] The switch module 211 includes a master-controlled thyristor, a slow-start resistor and a third switch. The connection relationship is shown in FIG. Figure 4 , no more details.

[0090] The compensation module 212 includes a plurality of thyristor bridge arms consisting of two thyristors, and each connection terminal of the primary winding of the compensation transformer T1 is correspondingly connected to a thyristor bridge arm. The controller can adjust the compensation voltage of the compensation transformer T1 by controlling the on and off of each thyristor.

[0091] Corresponding to the online maintenance circuit of the above-mentioned voltage stabilizer, an embodiment of the utility model provides a voltage stabilizer, including the online maintenance circuit of any of the above-mentioned voltage stabilizers, and having the beneficial effects of the online maintenance circuit of any of the above-mentioned voltage stabilizers.

[0092] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. An online maintenance circuit for a voltage stabilizer, characterized in that: The voltage stabilizer comprises at least one compensation transformer and an adjustment circuit for adjusting the compensation voltage of the compensation transformer; The online maintenance circuit includes a first switch, a switch control subcircuit, and a second switch corresponding to each of the compensation transformers; The first input end of the switch control subcircuit is used to input an online maintenance control signal, the second input end of the switch control subcircuit is used to input an auxiliary power supply power-off detection signal, and the output end of the switch control subcircuit is connected to the control end of the first switch; wherein, when the online maintenance control signal or the auxiliary power supply power-off detection signal is valid, the first switch remains in a closed state; The first end of the first switch is connected to the output live wire end of the voltage regulator, and the second end of the first switch is connected to the control end of the second switch; The second switch is connected between any two connection terminals of the primary winding of the corresponding compensation transformer; the switching state of the second switch is consistent with the switching state of the first switch.

2. The online maintenance circuit of the voltage stabilizer according to claim 1, characterized in that: The first switch comprises a relay; A first end of the coil of the relay is connected to the control end of the first switch, a second end of the coil of the relay is used to connect to a first voltage terminal, a first switch contact of the relay is connected to the first end of the first switch, and a second switch contact of the relay is connected to the second end of the first switch; When the coil of the relay is not energized, the first switch contact of the relay and the second switch contact of the relay are in a closed state.

3. The online maintenance circuit of the voltage stabilizer according to claim 1, characterized in that: The second switch comprises a contactor; The first end of the coil of the contactor is connected to the control end of the second switch, the second end of the coil of the contactor is connected to the neutral line end of the voltage regulator, and the first switch contact of the contactor and the second switch contact of the contactor are connected between any two wiring terminals of the primary winding of the corresponding compensation transformer; When the coil of the contactor is energized, the first switch contact of the contactor and the second switch contact of the contactor are in a closed state.

4. The online maintenance circuit of the voltage stabilizer according to any one of claims 1 to 3, characterized in that: The switch control subcircuit includes an AND gate module and a NOT gate module; The first input end of the AND gate module is connected to the first input end of the switch control subcircuit, the second input end of the AND gate module is connected to the second input end of the switch control subcircuit, and the output end of the AND gate module is connected to the input end of the NOT gate module; The output end of the NOT gate module is connected to the output end of the switch control subcircuit.

5. The online maintenance circuit of the voltage stabilizer as claimed in claim 4, characterized in that: The NOT gate module includes a NOT gate and a first resistor; The input end of the NOT gate is connected to the input end of the NOT gate module, the output end of the NOT gate is connected to the output end of the NOT gate module, and the output end of the NOT gate is also connected to the first voltage terminal through the first resistor.

6. The online maintenance circuit of the voltage stabilizer as claimed in claim 5, characterized in that: The NOT gate module further includes a second resistor and a third resistor connected in parallel; The output end of the NOT gate is connected to the output end of the NOT gate module through the second resistor and the third resistor connected in parallel.

7. The online maintenance circuit of the voltage stabilizer as claimed in claim 4, characterized in that: The AND gate module includes a first AND gate and a fourth resistor; The first input end of the first AND gate is connected to the first input end of the AND gate module, the second input end of the first AND gate is connected to the second input end of the AND gate module through the fourth resistor, and the output end of the first AND gate is connected to the output end of the AND gate module.

8. The online maintenance circuit of the voltage stabilizer as claimed in claim 7, characterized in that: The AND gate module also includes a second AND gate and a fifth resistor; The output end of the first AND gate is connected to the first input end of the second AND gate, the failure signal of the controller is input to the second input end of the second AND gate through the fifth resistor, and the output end of the second AND gate is connected to the output end of the AND gate module; The regulating circuit is controlled by the controller.

9. The online maintenance circuit of the voltage stabilizer as claimed in claim 4, characterized in that: The switch control subcircuit also includes a diode; The anode of the diode is connected to the output end of the NOT gate module, and the cathode of the diode is used to connect to the first voltage terminal.

10. A voltage stabilizer, characterized in that: An online maintenance circuit comprising the voltage stabilizer as claimed in any one of claims 1 to 9.

Images