A power supply circuit and substation communication management device

Abstract

The utility model relates to substation power supply technical field discloses a power supply circuit and substation communication management device, and power supply circuit includes input filter unit, fuse, EMC protection unit, rectifier bridge, transformer, output filter unit, switching power supply unit and feedback unit, the transformer includes primary main winding, primary auxiliary winding and secondary winding, in actual use, the utility model carries out the filtering to the input power supply through input filter unit, and carries out the anti -interference protection to the power supply after filtering through EMC protection unit to can to rectifier bridge input a stable voltage range's power supply when the power supply range of input is bigger, then can output stable power supply voltage through the feedback regulation of switching power supply unit and transformer, finally can make the power supply circuit of the utility model still can provide stable power supply voltage for substation communication device when having bigger range and not 220V alternating -current input, and the suitability is strong.

Description

Technical Field

[0001] This utility model relates to the field of substation power supply technology, specifically to a power supply circuit and a substation communication management device. Background Technology

[0002] With the development of power technology, the sources of electricity have gradually expanded from traditional thermal power generation and hydropower generation to clean power generation methods such as photovoltaic power generation and wind power generation; among them, photovoltaic power generation converts solar energy into electrical energy through solar panels, and wind power generation converts wind energy into electrical energy through wind turbines.

[0003] For solar and wind power generation, the generated electricity needs to be input into the power grid through substations during power transmission. In order to facilitate the monitoring of the power operation status in the power system, substations are equipped with communication management devices to send power status information. However, the existing communication management devices are compatible with 220V AC power. Solar and wind power generation are affected by the intensity of sunlight and the strength of wind, and their output voltage fluctuates. This makes the existing communication management devices incompatible with voltage fluctuations and not suitable for 220V AC power applications. Utility Model Content

[0004] In view of the shortcomings of the prior art, the present invention provides a power supply circuit and a substation communication management device. The technical problem to be solved is that the existing communication management devices are not compatible with voltage fluctuations and are not suitable for applications with 220V AC power.

[0005] To solve the above technical problems, this utility model provides the following technical solution: a power supply circuit, including an input filter unit, a fuse, an EMC protection unit, a rectifier bridge, a transformer, an output filter unit, a switching power supply unit, and a feedback unit; the transformer includes a primary main winding, a primary auxiliary winding, and a secondary winding;

[0006] The input filtering unit is used to filter the input power supply, and the filtered power supply is input to the input terminal of the EMC protection unit through a fuse. The output terminal of the EMC protection unit is electrically connected to the input terminal of the rectifier bridge. The positive output terminal of the rectifier bridge is electrically connected to the input terminal of the primary winding, one end of capacitor C2, one end of capacitor C3, and one end of resistor R4, respectively. The other end of capacitor C2 is grounded. The output terminal of the primary winding is electrically connected to the anode of diode D3, and the cathode of diode D3 is electrically connected to the other end of capacitor C3 and the other end of resistor R4, respectively.

[0007] The primary secondary winding is electrically connected to the switching power supply unit and is used to provide operating voltage to the switching power supply unit. The feedback unit is used to input the operating voltage to the feedback terminal of the switching power supply unit. The switching power supply unit controls the connection and disconnection between the primary main winding and the grounding point based on the feedback voltage input by the feedback unit.

[0008] The secondary winding is electrically connected to the input terminal of the output filter unit, and the output terminal of the output filter unit is electrically connected to the anode of diode D2. The anode of diode D2 is grounded through energy storage capacitor C8 and filter capacitor C9 respectively.

[0009] In one embodiment, the input filtering unit includes a resistor RV1, a capacitor C4, and a capacitor C5. The two ends of the resistor RV1 are electrically connected to the L input terminal and the N input terminal, respectively. One end of the resistor RV1 is electrically connected to one end of a fuse and grounded through the resistor C5. The other end of the resistor RV1 is electrically connected to one end of a thermistor NTC1 and grounded through the capacitor C4. The other ends of the fuse and the thermistor NTC1 are electrically connected to the EMC protection unit.

[0010] In one embodiment, the EMC protection unit includes at least one LC circuit connected in series. The LC circuit includes a common-mode inductor LB1 and a safety capacitor EC1. The first and second pins of the common-mode inductor LB1 are respectively connected to the other end of the fuse and the other end of the thermistor NTC1. The third and fourth pins of the common-mode inductor LB1 are respectively electrically connected to the two ends of the safety capacitor EC1.

[0011] In one implementation, the EMC protection unit includes two LC circuits.

[0012] In one embodiment, the switching power supply unit includes a switching power supply chip U4. Pins 1 and 2 of the switching power supply chip U4 are electrically connected to the output terminal of the primary secondary winding, and are electrically connected to pin 3 of the switching power supply chip U4 through capacitor C11. Pin 3 of the switching power supply chip U4 is used to input the feedback voltage. The input terminal of the primary secondary winding is electrically connected to pin 4 of the switching power supply chip U4 through diode D4 and resistor R7 in sequence to provide the operating voltage for the switching power supply unit. Pins 5, 6, 7, and 8 of the switching power supply chip U4 are all electrically connected to the output terminal of the primary main winding.

[0013] In one embodiment, the switching power supply chip U4 is model VIPER22ADIP-E.

[0014] In one embodiment, the feedback unit includes a reference voltage chip U2 of model CJ431. The third pin of the reference voltage chip U2 is electrically connected to one end of resistor R2 and one end of capacitor C6, respectively. The other end of resistor R2 is electrically connected to one end of resistor R3 and the primary side output terminal of optocoupler U3, respectively. The primary side output terminal of optocoupler U3 is electrically connected to the other end of resistor R3 and the cathode of diode D2, respectively.

[0015] The other end of capacitor C6 is electrically connected to pin 1 of reference voltage chip U2, one end of resistor R5 and one end of resistor R6 respectively. The other end of resistor R5 is electrically connected to pin 2 of reference voltage chip U2. The other end of resistor R6 is electrically connected to the cathode of diode D2.

[0016] The input terminal on the secondary side of the optocoupler U3 is used to input the operating voltage, and the output terminal on the secondary side of the optocoupler is used to output the feedback voltage.

[0017] In one embodiment, the output filtering unit includes capacitor C1, capacitor C7, resistor R1, inductor L1, and diode D1. The output terminal of the secondary winding is electrically connected to the anode of diode D1 and one end of capacitor C1, respectively. The cathode of diode D1 is electrically connected to one end of resistor R1, one end of capacitor C7, and one end of inductor L1, respectively. The other end of resistor R1 is electrically connected to the other end of capacitor C1. The other end of capacitor C7 is electrically connected to the input terminal of the secondary winding and grounded.

[0018] In one implementation, the input terminal of the secondary winding is also connected to ground via capacitor C10.

[0019] In addition, this utility model also provides a substation communication management device, including at least one of the above-mentioned power supply circuits, and further including a control unit, a storage unit, a 485 communication unit, a network port communication unit, a debugging interface unit, and a human-machine interaction unit. The power supply circuit is used to provide power voltage to the control unit, storage unit, 485 communication unit, network port communication unit, debugging interface unit, and human-machine interaction unit. The control unit is electrically connected to the storage unit, 485 communication unit, network port communication unit, debugging interface unit, and human-machine interaction unit respectively.

[0020] Compared with the prior art, the advantages of this utility model are as follows: This utility model filters the input power supply through an input filtering unit and provides anti-interference protection for the filtered power supply through an EMC protection unit. Thus, when the input power supply range is large, it can input a stable voltage range of power to the rectifier bridge. Then, through the feedback regulation of the switching power supply unit and the transformer, a stable power supply voltage can be output. Finally, the power supply circuit of this utility model can still provide a stable power supply voltage for the substation communication device when there is a large range of non-220V AC input, making it highly applicable. Attached Figure Description

[0021] Figure 1 The circuit diagram is shown for the power supply circuit in Example 1.

[0022] Figure 2 This is a structural diagram of the substation communication management device in the embodiment. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0024] Example 1

[0025] like Figure 1 As shown, the power supply circuit provided in this embodiment includes an input filter unit 1, a fuse FUSE1, an EMC protection unit 2, a rectifier bridge BG1, a transformer U1, an output filter unit 3, a switching power supply unit 4, and a feedback unit 5; the transformer U1 includes a primary main winding, a primary auxiliary winding, and a secondary winding, wherein the winding between pin 8 and pin 10 of the transformer U1 is the primary main winding, the winding between pin 7 and pin 6 of the transformer U1 is the primary auxiliary winding, and the winding between pin 2 and pin 5 of the transformer U1 is the secondary winding;

[0026] Input filter unit 1 is used to filter the input power supply, and the filtered power supply is input to the input terminal of EMC protection unit 2 through fuse FUSE1. The output terminal of EMC protection unit 2 is electrically connected to the input terminal of rectifier bridge BG1. The positive output terminal of rectifier bridge BG1 is electrically connected to the input terminal of primary main winding, one end of capacitor C2, one end of capacitor C3 and one end of resistor R4 respectively. The other end of capacitor C2 is grounded. The output terminal of primary main winding is electrically connected to the anode of diode D3. The cathode of diode D3 is electrically connected to the other end of capacitor C3 and the other end of resistor R4 respectively.

[0027] The primary secondary winding is electrically connected to the switching power supply unit 4 and is used to provide the working voltage to the switching power supply unit 4. The feedback unit 5 is used to input the working voltage to the feedback terminal of the switching power supply unit 4. The switching power supply unit 4 controls the on / off connection between the primary main winding and the ground point based on the feedback voltage input by the feedback unit 5.

[0028] The secondary winding is electrically connected to the input terminal of the output filter unit 3, and the output terminal of the output filter unit 3 is electrically connected to the anode of the diode D2. The anode of the diode D2 is grounded through the energy storage capacitor C8 and the filter capacitor C9 respectively.

[0029] In practical use, this invention filters the input power supply through the input filter unit 1 and provides anti-interference protection for the filtered power supply through the EMC protection unit 2. This allows for a stable voltage range to be supplied to the rectifier bridge BG1 even with a wide input power range. Then, through feedback regulation of the switching power supply unit 4 and the transformer U1, a stable output voltage can be achieved. Ultimately, this invention's power circuit can provide a stable power voltage to substation communication devices even with a wide range of input voltages other than 220V AC, demonstrating strong applicability. For example, this invention can accept voltages between 80V and 265V.

[0030] Specifically, in this embodiment, as Figure 1 As shown, the input filter unit 1 includes a resistor RV1, a capacitor C4, and a capacitor C5. The two ends of the resistor RV1 are electrically connected to the L input terminal and the N input terminal, respectively. One end of the resistor RV1 is electrically connected to one end of the fuse FUSE1 and grounded through the resistor C5. The other end of the resistor RV1 is electrically connected to one end of the thermistor NTC1 and grounded through the capacitor C4. The other ends of the fuse FUSE1 and the thermistor NTC1 are electrically connected to the EMC protection unit 2.

[0031] In practical use, the fuse FUSE1 can provide protection when the short-circuit current is too large. In addition, the thermistor NTC1 is a negative temperature coefficient thermistor. When the temperature rises, its resistance decreases. This increases the current flowing through the circuit under the same input voltage, allowing the circuit to trigger the fuse protection more quickly.

[0032] Specifically, in this embodiment, as Figure 1 As shown, the EMC protection unit 2 includes two LC circuits 20 connected in series. The LC circuit 20 includes a common mode inductor LB1 and a safety capacitor EC1. The first and second pins of the common mode inductor LB1 are respectively connected to the other end of the fuse FUSE1 and the other end of the thermistor NTC1. The third and fourth pins of the common mode inductor LB1 are respectively electrically connected to the two ends of the safety capacitor EC1.

[0033] In one implementation, the remaining number of LC circuits can be set according to actual needs.

[0034] Specifically, in this embodiment, as Figure 1 As shown, the switching power supply unit 4 includes a switching power supply chip U4 of model VIPER22ADIP-E. Pins 1 and 2 of the switching power supply chip U4 are electrically connected to the output terminal of the primary secondary winding, and are electrically connected to pin 3 of the switching power supply chip U4 through capacitor C11. Pin 3 of the switching power supply chip U4 is used to input feedback voltage. The input terminal of the primary secondary winding is electrically connected to pin 4 of the switching power supply chip U4 through diode D4 and resistor R7 in sequence to provide operating voltage for the switching power supply unit. Pins 5, 6, 7 and 8 of the switching power supply chip U4 are all electrically connected to the output terminal of the primary main winding.

[0035] Specifically, in this embodiment, as Figure 1 As shown, the feedback unit 5 includes a reference voltage chip U2 of model CJ431. The third pin of the reference voltage chip U2 is electrically connected to one end of resistor R2 and one end of capacitor C6, respectively. The other end of resistor R2 is electrically connected to one end of resistor R3 and the primary side output terminal of optocoupler U3, respectively. The primary side output terminal of optocoupler U3 is electrically connected to the other end of resistor R3 and the cathode of diode D2, respectively.

[0036] The other end of capacitor C6 is electrically connected to pin 1 of reference voltage chip U2, one end of resistor R5 and one end of resistor R6 respectively. The other end of resistor R5 is electrically connected to pin 2 of reference voltage chip U2. The other end of resistor R6 is electrically connected to the cathode of diode D2.

[0037] The input terminal on the secondary side of optocoupler U3 is used to input the operating voltage VDD_VIP, and the output terminal on the secondary side of the optocoupler is used to output the feedback voltage.

[0038] In actual use, the switching power supply chip U4 is an existing power supply chip. It adjusts whether pin 8 of transformer U1 is grounded based on the magnitude of the feedback voltage, thereby adjusting the voltage on the secondary winding.

[0039] Specifically, in this embodiment, the output filter unit 3 includes capacitor C1, capacitor C7, resistor R1, inductor L1, and diode D1. The output terminal of the secondary winding is electrically connected to the anode of diode D1 and one end of capacitor C1, respectively. The cathode of diode D1 is electrically connected to one end of resistor R1, one end of capacitor C7, and one end of inductor L1, respectively. The other end of resistor R1 is electrically connected to the other end of capacitor C1, and the other end of capacitor C7 is electrically connected to the input terminal of the secondary winding and grounded.

[0040] In addition, in this embodiment, as Figure 1As shown, the input terminal of the secondary winding is also connected to the ground through capacitor C10. In actual use, when the grounding point of the power supply circuit accumulates charge, the accumulated charge can be transferred to the ground through capacitor C10.

[0041] Example 2

[0042] like Figure 2 As shown, this embodiment also provides a substation communication management device, including at least one of the above-mentioned power supply circuits, and further including a control unit, a storage unit, a 485 communication unit, a network port communication unit, a debugging interface unit, and a human-machine interaction unit. The power supply circuit is used to provide power voltage to the control unit, storage unit, 485 communication unit, network port communication unit, debugging interface unit, and human-machine interaction unit. The control unit is electrically connected to the storage unit, 485 communication unit, network port communication unit, debugging interface unit, and human-machine interaction unit, respectively.

[0043] The control unit can be based on a microcontroller or other control chip, the storage unit can be based on FLASH memory, and the human-computer interaction unit can be based on an LCD screen.

[0044] Based on the above description and inspired by this utility model, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A power supply circuit, characterized in that, It includes an input filter unit, a fuse, an EMC protection unit, a rectifier bridge, a transformer, an output filter unit, a switching power supply unit, and a feedback unit; the transformer includes a primary main winding, a primary auxiliary winding, and a secondary winding; The input filtering unit is used to filter the input power supply, and the filtered power supply is input to the input terminal of the EMC protection unit through a fuse. The output terminal of the EMC protection unit is electrically connected to the input terminal of the rectifier bridge. The positive output terminal of the rectifier bridge is electrically connected to the input terminal of the primary winding, one end of capacitor C2, one end of capacitor C3, and one end of resistor R4, respectively. The other end of capacitor C2 is grounded. The output terminal of the primary winding is electrically connected to the anode of diode D3, and the cathode of diode D3 is electrically connected to the other end of capacitor C3 and the other end of resistor R4, respectively. The primary secondary winding is electrically connected to the switching power supply unit and is used to provide operating voltage to the switching power supply unit. The feedback unit is used to input the operating voltage to the feedback terminal of the switching power supply unit. The switching power supply unit controls the connection and disconnection between the primary main winding and the grounding point based on the feedback voltage input by the feedback unit. The secondary winding is electrically connected to the input terminal of the output filter unit, and the output terminal of the output filter unit is electrically connected to the anode of diode D2. The anode of diode D2 is grounded through energy storage capacitor C8 and filter capacitor C9 respectively.

2. The power supply circuit according to claim 1, characterized in that, The input filtering unit includes a resistor RV1, a capacitor C4, and a capacitor C5. The two ends of the resistor RV1 are electrically connected to the L input terminal and the N input terminal, respectively. One end of the resistor RV1 is electrically connected to one end of a fuse and grounded through the resistor C5. The other end of the resistor RV1 is electrically connected to one end of a thermistor NTC1 and grounded through the capacitor C4. The other ends of the fuse and the thermistor NTC1 are electrically connected to the EMC protection unit.

3. A power supply circuit according to claim 2, characterized in that, The EMC protection unit includes at least one LC circuit connected in series. The LC circuit includes a common-mode inductor LB1 and a safety capacitor EC1. The first and second pins of the common-mode inductor LB1 are respectively connected to the other end of the fuse and the other end of the thermistor NTC1. The third and fourth pins of the common-mode inductor LB1 are respectively electrically connected to the two ends of the safety capacitor EC1.

4. A power supply circuit according to claim 3, characterized in that, The EMC protection unit includes two LC circuits.

5. A power supply circuit according to claim 1, characterized in that, The switching power supply unit includes a switching power supply chip U4, model VIPER22ADIP-E. Pins 1 and 2 of the switching power supply chip U4 are electrically connected to the output terminal of the primary secondary winding, and are electrically connected to pin 3 of the switching power supply chip U4 through capacitor C11. Pin 3 of the switching power supply chip U4 is used to input the feedback voltage. The input terminal of the primary secondary winding is electrically connected to pin 4 of the switching power supply chip U4 through diode D4 and resistor R7 in sequence to provide the operating voltage for the switching power supply unit. Pins 5, 6, 7, and 8 of the switching power supply chip U4 are all electrically connected to the output terminal of the primary main winding.

6. A power supply circuit according to claim 5, characterized in that, The feedback unit includes a reference voltage chip U2 of model CJ431. The third pin of the reference voltage chip U2 is electrically connected to one end of resistor R2 and one end of capacitor C6, respectively. The other end of resistor R2 is electrically connected to one end of resistor R3 and the primary side output terminal of optocoupler U3, respectively. The primary side output terminal of optocoupler U3 is electrically connected to the other end of resistor R3 and the cathode of diode D2, respectively. The other end of capacitor C6 is electrically connected to pin 1 of reference voltage chip U2, one end of resistor R5 and one end of resistor R6 respectively. The other end of resistor R5 is electrically connected to pin 2 of reference voltage chip U2. The other end of resistor R6 is electrically connected to the cathode of diode D2. The input terminal on the secondary side of the optocoupler U3 is used to input the operating voltage, and the output terminal on the secondary side of the optocoupler is used to output the feedback voltage.

7. A power supply circuit according to claim 1, characterized in that, The output filtering unit includes capacitor C1, capacitor C7, resistor R1, inductor L1, and diode D1. The output terminal of the secondary winding is electrically connected to the anode of diode D1 and one end of capacitor C1. The cathode of diode D1 is electrically connected to one end of resistor R1, one end of capacitor C7, and one end of inductor L1. The other end of resistor R1 is electrically connected to the other end of capacitor C1. The other end of capacitor C7 is electrically connected to the input terminal of the secondary winding and grounded.

8. A power supply circuit according to claim 7, characterized in that, The input terminal of the secondary winding is also connected to the ground via capacitor C10.

9. A substation communication management device, characterized in that, The device includes at least one power supply circuit as described in any one of claims 1-8, and further includes a control unit, a storage unit, a 485 communication unit, a network port communication unit, a debugging interface unit, and a human-machine interaction unit. The power supply circuit is used to provide power voltage to the control unit, the storage unit, the 485 communication unit, the network port communication unit, the debugging interface unit, and the human-machine interaction unit. The control unit is electrically connected to the storage unit, the 485 communication unit, the network port communication unit, the debugging interface unit, and the human-machine interaction unit, respectively.

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