Reactive compensation controller for controlling capacitor switching

Abstract

The utility model discloses a reactive compensation controller for controlling capacitor switching in the technical field of reactive power compensation, which comprises a switching power supply U25, the input end of the switching power supply U25 is connected with a socket P6 through a protection circuit, and the output end of the switching power supply U25 is connected with a multipath isolation control unit through a filtering indication circuit. And each path of isolation control unit is connected with an alternating current contactor. The outside of the equipment is powered by alternating current 220v, and an isolation control unit is adopted to drive a circuit, so that the anti-interference purpose is enhanced; and the output part performs direct output control and is not associated with an internal control circuit through a power supply, so that the anti-interference purpose is enhanced, and the safety is higher.

Description

Technical Field

[0001] The utility model relates to a reactive power compensation controller in the technical field of reactive power compensation. Background Art

[0002] In order to adapt to the development of modernization and the increasing demand for energy, the original 12-way and 18-way controllers can no longer meet the demand for improved power quality under the installed capacity of the existing distribution room. Compared with the original controller, the capacity is increased and the cost is saved. In addition, the original controller uses a triode direct drive circuit, which is not anti-interference. This device has isolated input and dry node output, which improves the anti-interference and safety of the equipment. Utility Model Content

[0003] The purpose of the utility model is to provide a reactive compensation controller for controlling capacitor switching, with multi-channel output control and strong anti-interference performance. The device has a separate AC 220V power supply, and there is no direct power supply connection between the internal control circuit power supply and the input and output parts, and the safety is further improved.

[0004] To achieve the above-mentioned purpose, the utility model provides a reactive power compensation controller for controlling the switching of capacitors, including a switching power supply U25, the input end of the switching power supply U25 is connected to the socket P6 via a protection circuit, the output end of the switching power supply U25 is connected to a multi-channel isolation control unit via a filtering indication circuit, and each isolation control unit controls an external AC contactor.

[0005] Compared with the prior art, the beneficial effect of the utility model is that the device has an external AC 220V power supply and adopts an isolated control unit drive circuit, which enhances the anti-interference purpose; the output part directly outputs the control and has no power supply connection with the internal control circuit, which also enhances its anti-interference purpose and has higher safety.

[0006] As a further improvement of the utility model, the isolation control unit includes an optocoupler U1, the anode of the optocoupler U1 is connected to an external +12V DC power supply, the cathode of the optocoupler U1 is connected to the output end of the ULN2003 of the external controller, the collector of the optocoupler U1 is connected to the negative electrode of the diode D2, and the 2 ends of the relay K1 coil are connected in parallel to the +5V power supply end, the emitter of the optocoupler U1 is connected to one end of the resistor R7, the other end of the resistor R7 is connected to the base of the transistor Q1, a resistor R13 is connected between the base and the emitter of the transistor Q1, the emitter of the transistor Q1 is grounded, the collector of the transistor Q1 is connected in parallel to the 1st foot of the relay and the positive electrode of the diode D2, the 3rd foot of the relay is connected to the L phase of the AC 220v, the 4th foot of the relay is connected to one end of the external AC contactor drive coil, and the other end of the external AC contactor drive coil is connected to the N phase.

[0007] In this way, the use of optical coupler isolation for driving enhances the device's own anti-interference ability, that is, a failure in the external input will not affect other internal control circuits.

[0008] As a further improvement of the utility model, the protection circuit includes a fuse F1, one end of the fuse F1 is connected to pin 3 of the socket P6, the other end of the fuse F1 is connected to one end of the thermistor RT1, the other end of the thermistor RT1 is respectively connected to one end of the varistor RV and pin 2 of the switching power supply U25, and pin 1 of the switching power supply U25 is respectively connected to the other end of the varistor RV and pin 1 of the socket P6.

[0009] In this way, the fuse F1 plays a role of overcurrent protection, the thermistor RT1 can play a role of surge protection, and the varistor RV plays a role of overvoltage protection, thereby ensuring the safety of the input end of the switching power supply.

[0010] As a further improvement of the utility model, the filtering indication circuit includes a capacitor C1, the positive electrode of the capacitor C1 is connected to pin 6 of the switching power supply, the negative electrode of the capacitor C1 is connected to pin 4 of the switching power supply, the two ends of the capacitor C1 are connected in parallel with a capacitor C2, the positive electrode of the capacitor C1 is also connected to one end of the resistor R73, the other end of the resistor R73 is connected to the positive electrode of the light-emitting diode D1, the negative electrode of the light-emitting diode D1 is connected to the negative electrode of the capacitor C1 and is grounded, and one end of the resistor R73 is also connected to pin 2 of the relay.

[0011] In this way, capacitors C1 and C2 are connected in parallel to form a filter circuit, which can efficiently smooth the output DC 5V voltage and can also provide light indication through the light emitting diode.

[0012] As a further improvement of the present utility model, the isolation control unit is provided with 24 circuits.

[0013] This increases the capacity of the controller, which can better meet the power quality requirements under the existing installed capacity of the distribution room, increase capacity and save costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the circuit of the power supply part in the utility model.

[0015] Figure 2 The utility model is an isolation control unit circuit.

[0016] Figure 3 This is the input terminal block connection diagram in the present utility model.

[0017] Figure 4 This is the connection diagram of the output terminal block in the utility model. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the accompanying drawings:

[0019] like Figure 1-2 A reactive power compensation controller for controlling capacitor switching shown in the figure includes a switching power supply U25, the input end of the switching power supply U25 is connected to the socket P6 via a protection circuit, and the output end of the switching power supply U25 is connected to a multi-channel isolation control unit via a filter indication circuit, and each isolation control unit controls an external AC contactor.

[0020] The isolation control unit includes an optocoupler U1, the anode of the optocoupler U1 is connected to an external +12V DC power supply, the cathode of the optocoupler U1 is connected to the output end of the ULN2003 of the external controller, the collector of the optocoupler U1, the negative electrode of the diode D2, and the 2nd end of the relay K1 coil are connected in parallel to the +5V power supply end, the emitter of the optocoupler U1 is connected to one end of the resistor R7, the other end of the resistor R7 is connected to the base of the transistor Q1, a resistor R13 is connected between the base and the emitter of the transistor Q1, the emitter of the transistor Q1 is grounded, the collector of the transistor Q1, the 1st foot of the relay, and the positive electrode of the diode D2 are connected in parallel, the 3rd foot of the relay is connected to the L phase of the AC 220v, the 4th foot of the relay is connected to one end of the external AC contactor drive coil, and the other end of the external AC contactor drive coil is connected to the N phase.

[0021] The protection circuit includes a fuse F1, one end of the fuse F1 is connected to pin 3 of the socket P6, the other end of the fuse F1 is connected to one end of the thermistor RT1, the other end of the thermistor RT1 is respectively connected to one end of the varistor RV and pin 2 of the switching power supply U25, and pin 1 of the switching power supply U25 is respectively connected to the other end of the varistor RV and pin 1 of the socket P6.

[0022] The filter indicating circuit includes a capacitor C1, the positive electrode of the capacitor C1 is connected to the 6th pin of the switching power supply, the negative electrode of the capacitor C1 is connected to the 4th pin of the switching power supply, the two ends of the capacitor C1 are connected in parallel with a capacitor C2, the positive electrode of the capacitor C1 is also connected to one end of the resistor R73, the other end of the resistor R73 is connected to the positive electrode of the light-emitting diode D1, the negative electrode of the light-emitting diode D1 is connected to the negative electrode of the capacitor C1 and grounded, and one end of the resistor R73 is also connected to the 2nd pin of the relay. The isolation control unit is provided with 24 circuits.

[0023] In the utility model, the power supply part is composed of F1 fuse, RT1 thermistor, RV1 varistor, U25 switching power supply module, C1 high-frequency filter electrolytic capacitor, C2 ceramic capacitor, and an external power indicator composed of R73 and D1. Among them, F1 is 1A / 220V-AC to form an overcurrent protection circuit, RT1 has 5D-9 to form an anti-surge circuit, RV1 has 10D471 to form an overvoltage protection circuit, C1 and C2 are used for filtering, and the above parts together form a +5V DC output power supply part.

[0024] In the isolation control unit, the anode end of the optocoupler U1, namely the IN_COM end, is the input common end, which is connected to an external +12V DC power supply, and the cathode end, namely the IN_1, is the input control port, which is externally connected to the ULN2003 output end and is used to receive the control signal sent by ULN2003; the transistor Q1 is connected to the emitter of the optocoupler to control the contacting and disconnecting of the relay; the 3rd foot of the relay is the OUT_COM end, namely the output common end, which is externally connected to the AC contactor drive power supply, namely the AC 220v L phase; the 4th foot of the relay is the OUT_1 end, namely the output control end, which is externally connected to one end of the AC contactor drive coil, and the other end of the AC contactor drive coil is connected to the AC 220v N phase.

[0025] The external controller supplies +12v DC power to the IN_COM terminal. When the control port IN_1 inputs a high level, the optocoupler U1 is cut off and the transistor Q1 has no action; when the IN_1 inputs a low level, the optocoupler U1 is turned on, the transistor Q1 is also triggered to turn on, the relay K1 is energized, and its OUT_COM terminal is connected to the AC 220vL phase. The L phase power is output through the OUT_1 terminal of the relay K1 and transmitted to the AC contactor drive coil, so that the AC contactor drive coil is energized and energized, and the power capacitor used for compensation is controlled to be connected to the main power supply circuit for reactive power compensation.

[0026] The entire isolation control unit is equipped with 24 units in total, such as Figure 3 As shown, the anode of the optocoupler in each isolation control unit is connected to pin 1 of terminal block P2, and the cathode of the optocoupler in each isolation control unit is respectively connected to pins 1-12 of terminal block P1 and pins 2-13 of P2, and pins 2-13 of terminal block P2 and pins 1-12 of P1 are respectively connected to output terminals IN_1- IN_24 of ULN2003 of the external controller, and pin 1 of terminal block P2 is connected to an external +12V DC power supply.

[0027] like Figure 4As shown, pin 3 of each isolated control unit relay is connected to pin 1 of terminal block P3, and pin 4 of each relay is respectively connected to pins 2-8 of terminal block P3, 1-8 of terminal block P4, and 1-9 of terminal block P5, while pins 2-8 of terminal block P3, 1-8 of terminal block P4, and 1-9 of terminal block P5 are respectively connected to one end of an AC contactor drive coil, and pin 1 of terminal block P3 is connected to the AC 220vL phase.

[0028] The utility model adopts an isolation control unit driving circuit, which enhances the purpose of anti-interference and has higher safety. The equipment has an external AC 220V power supply, is not directly connected to the input and output parts, and adopts a 24-way isolation control unit to increase capacity, which can better meet the demand for improved power quality under the installed capacity of the existing distribution room.

[0029] The present utility model is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed herein, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present utility model.

Claims

1. A reactive power compensation controller for controlling capacitor switching, characterized in that: It includes a switching power supply U25, the input end of which is connected to the socket P6 via a protection circuit, and the output end of which is connected to a multi-channel isolation control unit via a filter indication circuit, and each isolation control unit controls an external AC contactor.

2. A reactive power compensation controller for controlling capacitor switching according to claim 1, characterized in that: The isolation control unit includes an optocoupler U1, the anode of the optocoupler U1 is connected to an external +12V DC power supply, the cathode of the optocoupler U1 is connected to the output end of the ULN2003 of the external controller, the collector of the optocoupler U1, the negative electrode of the diode D2, and the 2nd end of the relay K1 coil are connected in parallel to the +5V power supply end, the emitter of the optocoupler U1 is connected to one end of the resistor R7, the other end of the resistor R7 is connected to the base of the transistor Q1, a resistor R13 is connected between the base and the emitter of the transistor Q1, the emitter of the transistor Q1 is grounded, the collector of the transistor Q1, the 1st foot of the relay, and the positive electrode of the diode D2 are connected in parallel, the 3rd foot of the relay is connected to the L phase of the AC 220v, the 4th foot of the relay is connected to one end of the external AC contactor drive coil, and the other end of the external AC contactor drive coil is connected to the N phase.

3. A reactive power compensation controller for controlling capacitor switching according to claim 2, characterized in that: The protection circuit includes a fuse F1, one end of the fuse F1 is connected to pin 3 of the socket P6, the other end of the fuse F1 is connected to one end of the thermistor RT1, the other end of the thermistor RT1 is respectively connected to one end of the varistor RV and pin 2 of the switching power supply U25, and pin 1 of the switching power supply U25 is respectively connected to the other end of the varistor RV and pin 1 of the socket P6.

4. A reactive power compensation controller for controlling capacitor switching according to claim 3, characterized in that: The filtering indication circuit includes a capacitor C1, the positive electrode of the capacitor C1 is connected to pin 6 of the switching power supply, the negative electrode of the capacitor C1 is connected to pin 4 of the switching power supply, the two ends of the capacitor C1 are connected in parallel with a capacitor C2, the positive electrode of the capacitor C1 is also connected to one end of the resistor R73, the other end of the resistor R73 is connected to the positive electrode of the light-emitting diode D1, the negative electrode of the light-emitting diode D1 is connected to the negative electrode of the capacitor C1 and is grounded, and one end of the resistor R73 is also connected to pin 2 of the relay.

5. A reactive power compensation controller for controlling capacitor switching according to claim 4, characterized in that: The isolation control unit is provided with 24 channels.

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