CN205622303U - Utilize super capacitor to realize that current transformer of uninterrupted power supply gets electric power supply circuit - Google Patents

Abstract

The utility model discloses an utilize super capacitor to realize that current transformer of uninterrupted power supply gets electric power supply circuit, including current transformer, rectifier circuit, reverse discharging protective diode D1, forward discharge diode D2, direct current voltage conversion circuit, two direction switch and super capacitor, rectifier circuit's output has still met the bypass switch, forward discharge diode D2's negative pole has still met overvoltage protection sampling circuit, charging voltage sampling circuit and reference voltage circuit, and overvoltage protection sampling circuit's output termination has excessive pressure control and drive circuit, and charging voltage sampling circuit's output termination has sampling circuit 0 and drive circuit, and sampling circuit 2 is connected with drive circuit's output with excessive pressure control, and sampling circuit 4 and sampling circuit 0 are connected with drive circuit's output. The utility model discloses circuit structure is simple, reasonable in design, and improving energy efficiency greatly, the practicality is strong, excellent in use effect, convenient to popularize and use.

Description

Utilizing supercapacitors to realize uninterrupted power supply of current transformer power supply circuit

technical field

The utility model belongs to the technical field of power supplies, and in particular relates to a current transformer power supply circuit for realizing uninterrupted power supply by using a supercapacitor.

Background technique

At present, the country puts forward higher requirements on the power quality of the electric energy transmitted by the power grid, and requires the power grid to have high reliability and safety. When a fault occurs in the line, it can be detected in time, and the fault information will be sent to the monitoring center, and the power maintenance personnel will be notified in time. Eliminate line faults and restore power operation. As a necessary facility for the safe operation of the power grid, the power grid fault detection device is used in every power grid company. The normal operation of the fault detection device requires a reliable and stable DC power supply. Currently, the DC power supply used for the power grid fault detection device has the following methods: (1) Use solar panels and batteries for power supply. When there is sufficient sunlight during the day, the solar When the battery board is working, the battery is charged and stored through the charging circuit. When the battery board is not working, the battery supplies power to the device through the discharge circuit; (2) The overhead insulated ground wire used for communication and lightning protection in the overhead line of the power grid will be damaged by a strong magnetic field. Inductive potential is generated in the battery, through a certain technology, a closed loop is formed, there will be an induced current in the line, and the battery will be charged and stored through the charging circuit, and the battery will be discharged after power failure to achieve uninterrupted power supply; In regions, wind-solar hybrid power supply can be used; the wind-solar hybrid power supply system has wind turbines and solar cell arrays to generate electricity together. Through the control of the controller, the generated electric energy is stored in the battery. When the device needs electricity, the battery is discharged. Realize uninterrupted power supply; (4) Take power through PT (potential transformer) to ensure battery energy storage when the power system is working normally. After power failure, the control circuit automatically switches to the battery as a DC power supply to realize uninterrupted power supply; ( 5) Power is taken from the primary line through CT (current transformer), energy is stored in the battery, the circuit automatically switches modes after power failure, and the battery is discharged to realize uninterrupted power supply of the device.

Method (1) uses solar panels and batteries, which can meet the long-term work without external power supply, environmental protection and energy saving, but the size of the line fault detection device is greatly increased by the solar panels and batteries, and the conversion efficiency of solar panels It is greatly affected by factors such as weather, climate, and geography, and the battery itself has problems such as short service life, small charge and discharge current, overcharge and overdischarge cut-off protection circuits, and charge and discharge performance affected by temperature; method (2) takes The power scheme is suitable for high-voltage AC transmission lines of 110KV and above, and the grounding method adopts the operation mode of segmental insulation and one-point grounding, which has important application value for new lines and old technical transformation lines; method (3) requires that the area used has abundant solar energy and wind energy resources have great application potential in Qinghai, Tibet and other places; method (4) uses PT to take power, the voltage transformer is large in size, and the PT way of taking power is difficult to realize in a small space, and it is installed outdoors The PT is easily damaged by external force, and the safety of operation is affected. Moreover, the charging and discharging current of the battery is relatively small, so a charging and discharging current control circuit needs to be added. The power supply mode of PT combined with battery has problems such as large overall power supply volume, short service life of battery, and need to be replaced after a certain number of years of use; method (5) uses CT to take power, and the battery has a small charging and discharging current due to its own characteristics, which requires The charging and discharging current control circuit avoids damage to the battery due to excessive current, and the working voltage of the battery is narrow, so a battery charging and discharging voltage protection circuit must be added to ensure that the battery works within the allowable range. The power supply mode of CT with battery has disadvantages such as relatively complicated protection circuit, large device volume and inconvenient installation.

To sum up, the power supply methods of methods (1) to (5) all have certain limitations, and cannot well meet actual use requirements.

Utility model content

The technical problem to be solved by the utility model is to provide a current transformer power supply circuit that utilizes a supercapacitor to realize uninterrupted power supply. The circuit structure is simple, the design is reasonable, and energy utilization can be greatly improved. The utility model has the advantages of high efficiency, strong practicability, good use effect, and is convenient for popularization and use.

In order to solve the above-mentioned technical problems, the technical solution adopted by the utility model is: a current transformer power supply circuit using a super capacitor to realize uninterrupted power supply, which is characterized in that it includes a current transformer for taking power from the grid line and a rectifier circuit connected to the output end of the current transformer, as well as a reverse discharge protection diode D1, a forward discharge diode D2, a DC voltage conversion circuit, a bidirectional switch and a supercapacitor; the output end of the rectifier circuit is also connected with a bypass switch, the anode of the reverse discharge protection diode D1 is connected to the output end of the rectifier circuit and the bypass switch, the anode of the forward discharge diode D2 and the bidirectional switch are connected to the cathode of the reverse discharge protection diode D1, the The supercapacitor is connected with a bidirectional switch; the input terminal of the DC voltage conversion circuit is connected with the cathode of the forward discharge diode D2, and the cathode of the forward discharge diode D2 is also connected with an overvoltage protection sampling circuit, a charging voltage sampling circuit and a reference Voltage circuit, the output terminal of the DC voltage conversion circuit is the positive output terminal Vo+ of the current transformer power supply circuit that utilizes the super capacitor to realize uninterrupted power supply, and the negative pole of the super capacitor is the current that utilizes the super capacitor to realize uninterrupted power supply The transformer takes power from the negative output terminal Vo- of the power supply circuit, the output terminal of the overvoltage protection sampling circuit is connected with an overvoltage control and drive circuit, and the output terminal of the charging voltage sampling circuit is connected with a charge and discharge control and drive circuit, Both the overvoltage control and drive circuit and the charge and discharge control and drive circuit are connected to the output end of the reference voltage circuit, the bypass switch is connected to the output end of the overvoltage control and drive circuit, and the bidirectional switch is connected to the charge and discharge control Connect with the output terminal of the drive circuit.

The above-mentioned current transformer power supply circuit utilizing a supercapacitor to realize uninterrupted power supply is characterized in that: the rectifier circuit is a full-bridge rectifier circuit composed of diode D3, diode D4, diode D5 and diode D6, and the diode D3 The cathode of the diode D4 is connected to the anode of the diode D4 and is the first AC signal input terminal AC1 of the rectification circuit, the cathode of the diode D6 is connected to the anode of the diode D5 and is the second AC signal input terminal AC2 of the rectification circuit, and the diode D4 The cathode of the diode D5 is connected to the cathode of the diode D5 and is the positive DC voltage output terminal V+ of the rectification circuit, and the anode of the diode D3 is connected to the anode of the diode D6 and is the negative DC voltage output terminal V- of the rectification circuit; The first AC signal input terminal AC1 is connected to one terminal of the secondary side of the current transformer, and the second AC signal input terminal AC2 of the rectification circuit is connected to the other terminal of the secondary side of the current transformer.

The above-mentioned current transformer power supply circuit using a supercapacitor to realize uninterrupted power supply is characterized in that: the DC voltage conversion circuit includes a voltage conversion chip U4 and a polar capacitor C1, and the input terminal pin of the voltage conversion chip U4 VIN is the input terminal of the DC voltage conversion circuit and is connected to the positive pole of the polarity capacitor C1, the output terminal pin OUT of the voltage conversion chip U4 is the output terminal of the DC voltage conversion circuit, and the ground terminal of the voltage conversion chip U4 is lead Both the pin GND and the negative pole of the polarity capacitor C1 are grounded.

The above-mentioned current transformer power supply circuit utilizing a supercapacitor to realize uninterrupted power supply is characterized in that: the reference voltage circuit includes a three-terminal voltage stabilizing chip TL431, a non-polar capacitor C3 and a resistor R17, and the three-terminal voltage stabilizing The positive terminal of the chip TL431 and one end of the non-polar capacitor C3 are both grounded, one end of the resistor R17 is connected to the cathode of the forward discharge diode D2, and the voltage reference terminal and the negative terminal of the three-terminal voltage stabilizing chip TL431 are both connected to the ground. It is connected with the other end of the non-polar capacitor C3 and the other end of the resistor R17 and is the output end of the reference voltage circuit.

The above-mentioned current transformer power supply circuit using a supercapacitor to realize uninterrupted power supply is characterized in that: the charging voltage sampling circuit includes a resistor R2 and a resistor R3 connected in series, and one end of the resistor R2 and the resistor R3 connected in series is connected to the positive It is connected to the cathode of the discharge diode D2, the other end of the resistor R2 and the resistor R3 connected in series is grounded, and the connection end of the resistor R2 and the resistor R3 is the output end of the charging voltage sampling circuit.

The above-mentioned current transformer power supply circuit using a supercapacitor to realize uninterrupted power supply is characterized in that: the charge and discharge control and drive circuit includes a comparator U2 and a triode VT1, and the bidirectional switch is an enhanced PMOS transistor Q1; The noninverting input terminal of the comparator U2 is connected to the output terminal of the charging voltage sampling circuit through a resistor R14, the inverting input terminal of the comparator U2 is connected to the output terminal of the reference voltage circuit through a resistor R13, and the base of the triode VT1 It is connected with the output end of the comparator U2, and connected with the non-inverting input end of the comparator U2 through a resistor R15, the emitter of the triode VT1 is grounded, and the collector of the triode VT1 is connected with a series resistor R7 and Resistor R6, the gate of the enhanced PMOS transistor Q1 is connected to the connection end of the resistor R7 and the resistor R6, the source of the enhanced PMOS transistor Q1 is connected to one end of the resistor R6 and the cathode of the reverse discharge protection diode D1, The drain of the enhanced PMOS transistor Q1 is connected to the anode of the supercapacitor.

The above-mentioned current transformer power supply circuit using a supercapacitor to realize uninterrupted power supply is characterized in that: the overvoltage protection sampling circuit includes a resistor R4 and a resistor R5 connected in series, and one end of the resistor R4 and resistor R5 connected in series is connected to The cathode of the forward discharge diode D2 is connected, the other end of the series connection of the resistor R4 and the resistor R5 is grounded, and the connection end of the resistor R4 and the resistor R5 is the output end of the overvoltage protection sampling circuit.

The above-mentioned current transformer power supply circuit using a supercapacitor to realize uninterrupted power supply is characterized in that: the overvoltage control and drive circuit includes a comparator U1, and the bypass switch is an enhanced NMOS transistor Q2; the comparison The non-inverting input terminal of the comparator U1 is connected to the output terminal of the overvoltage protection sampling circuit through the resistor R10, the inverting input terminal of the comparator U1 is connected to the output terminal of the reference voltage circuit through the resistor R9, and the enhanced NMOS transistor Q2 The gate is connected to the output terminal of the comparator U1, and is connected to the non-inverting input terminal of the comparator U1 through a resistor R11, and the drain of the enhanced NMOS transistor Q2 is connected to the output terminal of the rectifier circuit and reverse discharge protection The anode of the diode D1 is connected, and the source of the enhanced NMOS transistor Q2 is grounded.

Compared with the prior art, the utility model has the following advantages:

1. The circuit structure of the utility model is simple, the design is reasonable, and the realization is convenient.

2. The utility model adopts the current transformer to take power from the primary line, supplemented by supercapacitor energy storage to realize uninterrupted power supply. Compared with the traditional method, this method takes into account the size and service life of the fault detection device, and is a traditional method Incomparable, because the current transformer is cheaper than the voltage transformer, and can be easily installed inside the distribution switch box or made into an opening and directly hung on the distribution line, so the power monitoring and indicating equipment for overhead lines , The current transformer method is a very promising power supply method.

3. As long as the primary circuit has a certain current, the uninterruptible power supply of the utility model can take power and supply energy through the current transformer, and the power supply has versatility.

4. After the line breaker trips due to a fault in the power grid, the backup supercapacitor is discharged, and the DC voltage conversion circuit continues to provide a stable working voltage to achieve uninterrupted power supply. The charging control is realized by comparing the voltage of the pre-stabilizing circuit with the reference voltage. After reaching the charging voltage value, the bidirectional switch control circuit is triggered immediately to turn on the bidirectional switch to charge and store the energy for the supercapacitor. When the charging voltage of the supercapacitor is about to reach the set voltage, the sampling network divider voltage is compared with the reference voltage, and the overvoltage protection control circuit outputs a high level to turn on the bypass switch to protect the supercapacitor. The action of the protection switch is realized by a pure analog method, and the complexity of the circuit is obviously reduced.

5. A diode is ingeniously connected in series at the front end of the DC voltage conversion circuit, which can prevent the input voltage of the DC voltage conversion circuit from dropping and the external power supply is abnormal when the bidirectional switch conducts to charge the super capacitor. The circuit connects a diode in series in the charging circuit of the supercapacitor to prevent the supercapacitor from discharging through the bypass switch when the bypass switch is turned on.

6. The power supply system based on current transformers to take power and store energy in supercapacitors has the advantages of low cost, low power consumption, good isolation performance, and environmental protection. It has great promotion and application in line fault indicators or power distribution automation terminals value.

7. The utility model has strong practicability, good use effect, and is convenient for popularization and use.

To sum up, the circuit structure of the utility model is simple, the design is reasonable, the energy utilization rate can be greatly improved, the practicability is strong, the use effect is good, and it is easy to popularize and use.

The technical solutions of the present utility model will be further described in detail through the drawings and embodiments below.

Description of drawings

Fig. 1 is the block diagram of circuit principle of the utility model.

Fig. 2 is the schematic circuit diagram of the utility model.

Explanation of reference signs:

1—rectifier circuit; 2—bypass switch; 3—DC voltage conversion circuit;

4—bidirectional switch; 5—supercapacitor; 6—charge and discharge control and drive circuit;

7—reference voltage circuit; 8—overvoltage control and drive circuit; 9—overvoltage protection sampling circuit;

10—charging voltage sampling circuit; 11—current transformer.

detailed description

As shown in Figure 1 and Figure 2, a current transformer power supply circuit that utilizes a supercapacitor to realize uninterrupted power supply includes a current transformer 11 for taking power from the grid line and an output terminal of the current transformer 11 A connected rectifier circuit 1, and a reverse discharge protection diode D1, a forward discharge diode D2, a DC voltage conversion circuit 3, a bidirectional switch 4 and a supercapacitor 5; the output end of the rectifier circuit 1 is also connected to a bypass switch 2, The anode of the reverse discharge protection diode D1 is connected to the output terminal of the rectifier circuit 1 and the bypass switch 2, and the anode of the forward discharge diode D2 and the bidirectional switch 4 are connected to the cathode of the reverse discharge protection diode D1, so The supercapacitor 5 is connected with the bidirectional switch 4; the input terminal of the DC voltage conversion circuit 3 is connected with the cathode of the forward discharge diode D2, and the cathode of the forward discharge diode D2 is also connected with an overvoltage protection sampling circuit 9, charging Voltage sampling circuit 10 and reference voltage circuit 7, the output terminal of described DC voltage conversion circuit 3 is the positive pole output terminal Vo+ of the current transformer that utilizes supercapacitor to realize uninterrupted power supply power supply circuit, and the negative pole of described supercapacitor 5 is Utilize the supercapacitor to realize uninterrupted power supply of the negative output end Vo- of the current transformer power supply circuit, the output end of the overvoltage protection sampling circuit 9 is connected with an overvoltage control and drive circuit 8, and the charging voltage sampling circuit 10 The output terminal of the charging and discharging control and driving circuit 6 is connected, the overvoltage controlling and driving circuit 8 and the charging and discharging controlling and driving circuit 6 are connected with the output terminal of the reference voltage circuit 7, and the bypass switch 2 is connected with the overvoltage The output end of the control and drive circuit 8 is connected, and the bidirectional switch 4 is connected with the output end of the charge and discharge control and drive circuit 6 .

As shown in Figure 2, in this embodiment, the rectifier circuit 1 is a full-bridge rectifier circuit composed of diode D3, diode D4, diode D5 and diode D6, the cathode of the diode D3 is connected to the anode of the diode D4 and is The first AC signal input terminal AC1 of the rectifier circuit 1, the cathode of the diode D6 is connected to the anode of the diode D5 and is the second AC signal input terminal AC2 of the rectifier circuit 1, and the cathode of the diode D4 is connected to the cathode of the diode D5 And it is the positive DC voltage output terminal V+ of the rectification circuit 1, the anode of the diode D3 is connected to the anode of the diode D6 and is the negative DC voltage output terminal V- of the rectification circuit 1; the first AC signal input of the rectification circuit 1 The terminal AC1 is connected to one terminal of the secondary side of the current transformer 11 , and the second AC signal input terminal AC2 of the rectifier circuit 1 is connected to the other terminal of the secondary side of the current transformer 11 .

As shown in Figure 2, in this embodiment, the DC voltage conversion circuit 3 includes a voltage conversion chip U4 and a polar capacitor C1, and the input terminal pin VIN of the voltage conversion chip U4 is the input terminal of the DC voltage conversion circuit 3 And it is connected to the positive pole of the polar capacitor C1, the output pin OUT of the voltage conversion chip U4 is the output terminal of the DC voltage conversion circuit 3, the ground pin GND of the voltage conversion chip U4 and the polar capacitor C1 Both negative poles are grounded.

As shown in Figure 2, in this embodiment, the reference voltage circuit 7 includes a three-terminal voltage stabilizing chip TL431, a non-polar capacitor C3 and a resistor R17, the positive terminal of the three-terminal voltage stabilizing chip TL431 and the non-polar One end of the capacitor C3 is grounded, one end of the resistor R17 is connected to the cathode of the forward discharge diode D2, and the voltage reference terminal and the negative terminal of the three-terminal voltage stabilizing chip TL431 are connected to the other end of the non-polar capacitor C3 and The other end of the resistor R17 is connected to and is the output end of the reference voltage circuit 7 .

As shown in Figure 2, in this embodiment, the charging voltage sampling circuit 10 includes a resistor R2 and a resistor R3 connected in series, and one end of the resistor R2 and the resistor R3 connected in series is connected to the cathode of the forward discharge diode D2, the The other end of the resistor R2 and the resistor R3 connected in series is grounded, and the connecting end of the resistor R2 and the resistor R3 is the output end of the charging voltage sampling circuit 10 .

As shown in Figure 2, in this embodiment, the charge and discharge control and drive circuit 6 includes a comparator U2 and a transistor VT1, the bidirectional switch 4 is an enhanced PMOS transistor Q1; the non-inverting input terminal of the comparator U2 is passed The resistor R14 is connected to the output terminal of the charging voltage sampling circuit 10, the inverting input terminal of the comparator U2 is connected to the output terminal of the reference voltage circuit 7 through the resistor R13, and the base of the triode VT1 is connected to the output terminal of the comparator U2. The output end is connected, and is connected with the non-inverting input end of the comparator U2 through a resistor R15, the emitter of the triode VT1 is grounded, and the collector of the triode VT1 is connected with a series resistor R7 and a resistor R6. The enhanced The gate of the PMOS transistor Q1 is connected to the connecting end of the resistor R7 and the resistor R6, the source of the enhanced PMOS transistor Q1 is connected to one end of the resistor R6 and the cathode of the reverse discharge protection diode D1, and the enhanced PMOS transistor Q1 The drain is connected to the positive pole of the supercapacitor 5. During specific implementation, the power supply terminal of the comparator U2 is connected to the cathode of the forward discharge diode D2, the ground terminal of the comparator U2 is grounded, and the base of the triode VT1 is connected to the cathode of the forward discharge diode D2 through the resistor R16. connect.

As shown in Figure 2, in this embodiment, the overvoltage protection sampling circuit 9 includes a resistor R4 and a resistor R5 connected in series, and one end of the resistor R4 and the resistor R5 connected in series is connected to the cathode of the forward discharge diode D2, so The other end of the resistor R4 and the resistor R5 connected in series is grounded, and the connecting end of the resistor R4 and the resistor R5 is the output end of the overvoltage protection sampling circuit 9 .

As shown in Figure 2, in this embodiment, the overvoltage control and drive circuit 8 includes a comparator U1, and the bypass switch 2 is an enhanced NMOS transistor Q2; the non-inverting input terminal of the comparator U1 passes through a resistor R10 It is connected with the output terminal of the overvoltage protection sampling circuit 9, the inverting input terminal of the comparator U1 is connected with the output terminal of the reference voltage circuit 7 through a resistor R9, and the gate of the enhanced NMOS transistor Q2 is connected with the comparator The output terminal of U1 is connected, and is connected with the non-inverting input terminal of the comparator U1 through the resistor R11, the drain of the enhanced NMOS transistor Q2 is connected with the output terminal of the rectifier circuit 1 and the anode of the reverse discharge protection diode D1, The source of the enhanced NMOS transistor Q2 is grounded. During specific implementation, the power supply terminal of the comparator U1 is connected to the cathode of the forward discharge diode D2, the ground terminal of the comparator U1 is grounded, and the gate of the enhanced NMOS transistor Q2 is connected to the forward discharge diode D2 through the resistor R12. The cathode of D2 is connected to ground through resistor R1.

Concrete process when adopting the utility model to supply power is:

Connect the primary side of the current transformer 11 to the grid line, and connect the electrical equipment to the output terminal of the DC voltage conversion circuit 3;

When current flows through the primary side of the current transformer 11, the AC current coupled to the secondary side of the current transformer 11 is converted into a DC current through the rectifier circuit 1, and the DC current first passes through the pair of reverse discharge protection diode D1 and forward discharge diode D2. The capacitor C1 in the DC voltage conversion circuit 3 is charged. When the capacitor C1 is charged to the working voltage required by the voltage conversion chip U4 in the DC voltage conversion circuit 3, the voltage conversion and voltage stabilization are performed by the DC voltage conversion circuit 3. Provide a stable DC voltage Vo; at the same time, the overvoltage protection sampling circuit 9 samples the voltage after the forward discharge diode D2 and outputs the sampled voltage to the overvoltage control and drive circuit 8, and the charging voltage sampling circuit 10 pairs the voltage after the forward discharge diode D2 The voltage after the forward discharge diode D2 is sampled and the sampled voltage is output to the charge and discharge control and drive circuit 6, and the reference voltage circuit 7 converts the voltage after the forward discharge diode D2 into a reference voltage, which is provided to the overvoltage control With the drive circuit 8 and the charge and discharge control and drive circuit 6; the charge and discharge control and drive circuit 6 compares the voltage sampled by the charging voltage sampling circuit 10 with the reference voltage, when the voltage sampled by the charge voltage sampling circuit 10 is higher than the reference voltage At this time, the voltage sampled by the charging voltage sampling circuit 10 reaches the charging set voltage, the charging and discharging control and driving circuit 6 controls the bidirectional switch 4 to turn on, and the voltage output by the rectifying circuit 1 passes through the reverse discharge protection diode D1 to the supercharger. The capacitor 5 charges and stores energy; the overvoltage control and drive circuit 8 compares the voltage sampled by the overvoltage protection sampling circuit 9 with the reference voltage, and when the voltage sampled by the overvoltage protection sampling circuit 9 is higher than the reference voltage, the super The energy stored in the capacitor 5 has reached the set voltage of the energy storage limit, the voltage sampled by the overvoltage protection sampling circuit 9 has reached the set voltage for the overvoltage protection, the overvoltage control and drive circuit 8 controls the bypass switch 2 to conduct, and the rectifier circuit The DC current output by 1 passes through the bypass switch 2 to form a circulation loop;

When the grid line fails and the fault protection circuit breaker in the grid line trips, the current on the primary side of the current transformer 11 disappears, and the supercapacitor 5 acts as a backup power supply. After the output voltage passes through the bidirectional switch 4 and the forward discharge diode D2, it passes through the DC The conversion circuit 3 performs voltage conversion and voltage stabilization, and continues to provide a stable DC voltage Vo for the electrical equipment.

In the utility model, by setting the overvoltage protection sampling circuit 9, the overvoltage control and driving circuit 8 and the bypass switch 2, it is possible to prevent the supercapacitor 5 from being damaged due to an excessively high charging voltage of the supercapacitor 5.

The above are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any simple modifications, changes and equivalent structural changes made to the above embodiments according to the technical essence of the present utility model still belong to Within the scope of protection of the technical solution of the utility model.

Claims (8)

1. A current transformer power supply circuit utilizing a supercapacitor to realize uninterrupted power supply, characterized in that: comprising a current transformer (11) and an output of the current transformer (11) for taking power from the grid line A rectifier circuit (1) connected to the terminal, and a reverse discharge protection diode D1, a forward discharge diode D2, a DC voltage conversion circuit (3), a bidirectional switch (4) and a supercapacitor (5); the rectifier circuit (1) The output end of the output terminal is also connected with a bypass switch (2), the anode of the reverse discharge protection diode D1 is connected with the output end of the rectifier circuit (1) and the bypass switch (2), and the anode of the forward discharge diode D2 and the bidirectional switch (4) are connected with the cathode of the reverse discharge protection diode D1, and the supercapacitor (5) is connected with the bidirectional switch (4); the input terminal of the DC voltage conversion circuit (3) is connected with the forward discharge diode The cathode of D2 is connected, and the cathode of the forward discharge diode D2 is also connected with an overvoltage protection sampling circuit (9), a charging voltage sampling circuit (10) and a reference voltage circuit (7), and the DC voltage conversion circuit (3) The output terminal of the supercapacitor (5) is the positive output terminal Vo+ of the current transformer power supply circuit that utilizes a supercapacitor to realize uninterrupted power supply, and the negative pole of the supercapacitor (5) is a current transformer power supply circuit that utilizes a supercapacitor to realize uninterrupted power supply. The negative output terminal Vo- of the overvoltage protection sampling circuit (9) is connected with an overvoltage control and drive circuit (8), and the output terminal of the charging voltage sampling circuit (10) is connected with a charge and discharge control and drive circuit (8). drive circuit (6), the overvoltage control and drive circuit (8) and the charge and discharge control and drive circuit (6) are connected to the output end of the reference voltage circuit (7), and the bypass switch (2) is connected to the overvoltage The voltage control is connected to the output end of the drive circuit (8), and the bidirectional switch (4) is connected to the charge and discharge control and output end of the drive circuit (6). 2. The current transformer power supply circuit for uninterrupted power supply utilizing a supercapacitor according to claim 1, characterized in that: said rectifier circuit (1) is composed of diode D3, diode D4, diode D5 and diode D6 A full-bridge rectifier circuit, the cathode of the diode D3 is connected to the anode of the diode D4 and is the first AC signal input terminal AC1 of the rectifier circuit (1), the cathode of the diode D6 is connected to the anode of the diode D5 and is a rectifier circuit The second AC signal input terminal AC2 of (1), the cathode of the diode D4 is connected to the cathode of the diode D5 and is the positive DC voltage output terminal V+ of the rectifier circuit (1), the anode of the diode D3 is connected to the anode of the diode D6 connected and is the negative DC voltage output terminal V- of the rectifier circuit (1); the first AC signal input terminal AC1 of the rectifier circuit (1) is connected to one end of the secondary side of the current transformer (11), and the rectifier The second AC signal input end AC2 of the circuit (1) is connected with the other end of the secondary side of the current transformer (11). 3. According to the current transformer power supply circuit utilizing a supercapacitor to realize uninterrupted power supply according to claim 1, it is characterized in that: the DC voltage conversion circuit (3) includes a voltage conversion chip U4 and a polar capacitor C1, the The input terminal pin VIN of the voltage conversion chip U4 is the input terminal of the DC voltage conversion circuit (3) and is connected to the positive pole of the polar capacitor C1, and the output terminal pin OUT of the voltage conversion chip U4 is the DC voltage conversion circuit ( 3) at the output end, the ground pin GND of the voltage conversion chip U4 and the negative electrode of the polarity capacitor C1 are both grounded. 4. The current transformer power supply circuit for uninterrupted power supply utilizing a supercapacitor according to claim 1, characterized in that: the reference voltage circuit (7) includes a three-terminal voltage stabilizing chip TL431, a non-polar capacitor C3 and resistor R17, the positive terminal of the three-terminal voltage stabilizing chip TL431 and one end of the non-polar capacitor C3 are both grounded, one end of the resistor R17 is connected to the cathode of the forward discharge diode D2, and the three-terminal voltage stabilizing chip Both the voltage reference end and the negative terminal of the TL431 are connected with the other end of the non-polar capacitor C3 and the other end of the resistor R17 and are the output end of the reference voltage circuit (7). 5. The current transformer power supply circuit utilizing a supercapacitor to realize uninterrupted power supply according to claim 1, characterized in that: the charging voltage sampling circuit (10) includes a resistor R2 and a resistor R3 connected in series, and the resistor One end of the series connection of R2 and resistor R3 is connected to the cathode of the forward discharge diode D2, the other end of the series connection of the resistance R2 and the resistance R3 is grounded, and the connection end of the resistance R2 and the resistance R3 is a charging voltage sampling circuit (10) output terminal. 6. The current transformer power supply circuit utilizing a supercapacitor to realize uninterrupted power supply according to claim 1, characterized in that: the charge and discharge control and drive circuit (6) includes a comparator U2 and a triode VT1, the The bidirectional switch (4) is an enhanced PMOS transistor Q1; the noninverting input terminal of the comparator U2 is connected to the output terminal of the charging voltage sampling circuit (10) through a resistor R14, and the inverting input terminal of the comparator U2 is connected through a resistor R13 It is connected with the output terminal of the reference voltage circuit (7), the base of the triode VT1 is connected with the output terminal of the comparator U2, and is connected with the non-inverting input terminal of the comparator U2 through a resistor R15, and the triode VT1 is connected with the output terminal of the comparator U2. The emitter of the triode VT1 is connected to the collector of the triode VT1 connected in series with a resistor R7 and a resistor R6, the gate of the enhanced PMOS transistor Q1 is connected to the connection end of the resistor R7 and the resistor R6, and the enhanced PMOS transistor Q1 The source is connected to one end of the resistor R6 and the cathode of the reverse discharge protection diode D1, and the drain of the enhanced PMOS transistor Q1 is connected to the anode of the supercapacitor (5). 7. The current transformer power supply circuit utilizing a supercapacitor to realize uninterrupted power supply according to claim 1, characterized in that: the overvoltage protection sampling circuit (9) includes a resistor R4 and a resistor R5 connected in series, and the One end of the series connection of the resistance R4 and the resistance R5 is connected to the cathode of the forward discharge diode D2, the other end of the series connection of the resistance R4 and the resistance R5 is grounded, and the connection end of the resistance R4 and the resistance R5 is an overvoltage protection sampling circuit ( 9) the output terminal. 8. The current transformer power supply circuit for uninterrupted power supply utilizing a supercapacitor according to claim 1, characterized in that: the overvoltage control and drive circuit (8) includes a comparator U1, and the bypass switch (2) is an enhanced NMOS transistor Q2; the noninverting input terminal of the comparator U1 is connected with the output terminal of the overvoltage protection sampling circuit (9) through a resistor R10, and the inverting input terminal of the comparator U1 is connected with the output terminal of the overvoltage protection sampling circuit (9) through a resistor R9 The output terminal of the reference voltage circuit (7) is connected, the gate of the enhanced NMOS transistor Q2 is connected to the output terminal of the comparator U1, and is connected to the non-inverting input terminal of the comparator U1 through a resistor R11, the The drain of the enhanced NMOS transistor Q2 is connected to the output terminal of the rectifier circuit (1) and the anode of the reverse discharge protection diode D1, and the source of the enhanced NMOS transistor Q2 is grounded.