Prepayment reclosing control circuit and control device

Abstract

The utility model relates to the technical field of electronics, in particular to a prepayment reclosing control circuit and a control device. The control circuit comprises a control unit, a signal receiving circuit and a relay driving circuit. The signal receiving circuit is connected with the intelligent electric meter, the output end of the signal receiving circuit is connected with the control unit, the control unit is connected with the relay driving circuit, and the relay driving circuit is connected with the relay. When the intelligent electric meter detects that the balance of a user is used up or the circuit breaks down, the signal receiving circuit can receive a control signal output by the intelligent electric meter so as to output a corresponding shunt signal to the control unit to control the relay to be switched off, and the intelligent electric meter can be switched off after the user recharges and pays or the fault is removed. The signal receiving circuit can receive the control signal output by the intelligent electric meter so as to output a corresponding closing signal to the control unit to control closing of the relay, so that on-site manual operation is not needed, the overall operation efficiency of a power grid system is improved, and meanwhile, the labor cost is saved.

Description

Technical Field

[0001] The present application relates to the field of electronic technologies, and particularly to a prepaid reclosing control circuit and a control device. Background Art

[0002] With the development of society and economy, the power system has become increasingly important in the national economy, and the demand for the construction of intelligent digital power grid systems in industrial production is getting higher and higher. And the requirements for intelligent electricity meters and reclosing control circuits in intelligent digital power grid systems are also getting higher and higher. In the public power grid, it is usually necessary to set up relays to ensure the safety of the power supply system. In related technologies, after the intelligent electricity meter detects that the user balance is exhausted or a circuit fault occurs, the relay will be cut off immediately, thereby cutting off the power supply to ensure the safety of the power grid system. And after the user recharges and pays or the fault is eliminated, manual closing is required to restore the power supply, which increases the labor cost. At the same time, the efficiency of manual closing is low, reducing the overall operation efficiency of the power grid system. Summary of the Utility Model

[0003] The present application provides a prepaid reclosing control circuit and a control device to solve the technical problem of increased labor cost caused by manual closing in related technologies.

[0004] In a first aspect, the present application provides a prepaid reclosing control circuit, and the control circuit includes a control unit, a signal receiving circuit, and a relay driving circuit;

[0005] The input end of the signal receiving circuit is connected to the control signal output end of the intelligent electricity meter, the output end of the signal receiving circuit is connected to the control unit, the control signal output pin of the control unit is connected to the input end of the relay driving circuit, and the output end of the relay driving circuit is connected to the control end of the relay;

[0006] Wherein, the signal receiving circuit is configured to receive the control signal output by the intelligent electricity meter and convert the control signal into a digital signal to output to the control unit; the control unit is configured to output a corresponding driving control signal to the relay driving circuit according to the control signal; the relay driving circuit is configured to output a corresponding driving signal according to the driving control signal to drive the relay to act.

[0007] In a possible design, the control circuit further includes a power supply circuit;

[0008] The input end of the power supply circuit is configured to connect to a power supply, and the output end of the power supply circuit is connected to the control unit and the relay driving circuit;

[0009] The power supply circuit is used to process the electrical signal output by the power supply, so as to supply power to the control unit and the relay drive circuit.

[0010] In a possible design, the power supply circuit includes a rectifier circuit, a filter circuit and a voltage conversion chip;

[0011] The input end of the rectifier circuit is used to connect to the power supply. The output end of the rectifier circuit is connected to the input end of the filter circuit. The output end of the filter circuit is connected to the input pin of the voltage conversion chip. The output end of the voltage conversion chip is connected to the power supply pin of the control unit;

[0012] Among them, the rectifier circuit is used to convert the alternating current signal output by the power supply into a direct current signal; the filter circuit is used to filter the direct current signal output by the rectifier circuit; the voltage conversion chip is used to convert the voltage of the direct current signal.

[0013] In a possible design, the power supply circuit further includes a varistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a seventh capacitor, a second resistor, a fifth resistor and a first inductor; the filter circuit includes a fifth capacitor, a sixth capacitor and a first resistor;

[0014] The positive pole of the output end of the rectifier circuit is connected to the first end of the varistor. The negative pole of the output end of the rectifier circuit is connected to the second end of the varistor. The first end of the fourth capacitor is connected to the first end of the varistor. The second end of the fourth capacitor is connected to the second end of the varistor. The first end of the fifth capacitor is connected to the first end of the fourth capacitor. The second end of the fifth capacitor is connected to the second end of the fourth capacitor. The first end of the sixth capacitor is connected to the first end of the fifth capacitor. The second end of the sixth capacitor is connected to the second end of the fifth capacitor; the second end of the sixth capacitor is grounded;

[0015] The first end of the first resistor is connected to the first end of the sixth capacitor; the second end of the first resistor is connected to the enable pin of the voltage conversion chip; the first end of the sixth capacitor is connected to the power input pin of the voltage conversion chip. The switch control pin of the voltage conversion chip is connected to the first end of the third capacitor. The second end of the third capacitor is connected to the self-boosting pin of the voltage conversion chip; the output voltage feedback pin of the voltage conversion chip is connected to the first end of the fifth resistor. The second end of the fifth resistor is grounded; the first end of the second resistor is connected to the output voltage feedback pin, and the second end is used to output a power supply voltage signal; the seventh capacitor is connected in parallel at both ends of the second resistor;

[0016] The first end of the first inductor is connected to the first end of the third capacitor, the second end of the first inductor is connected to the first end of the first capacitor, and the second end of the first capacitor is grounded; the first end of the second capacitor is connected to the first end of the first capacitor, and the second end of the second capacitor is grounded.

[0017] In a possible design, the control circuit further includes a flag signal receiving circuit. The input end of the flag signal receiving circuit is connected to the flag signal output end of the smart meter, and the output end of the flag signal receiving circuit is connected to the control unit.

[0018] The flag signal receiving circuit is configured to receive the flag signal output by the smart meter and convert the flag signal into a corresponding digital signal; the flag signal is used to characterize the validity of the control signal output by the signal receiving circuit.

[0019] In a possible design, the flag signal receiving circuit includes a ninth resistor, an eleventh resistor, a twelfth resistor, a twelfth capacitor, and a first optocoupler.

[0020] The positive electrode of the light emitter of the first optocoupler is the input end of the flag signal receiving circuit. The positive electrode of the light emitter of the first optocoupler is connected to the smart meter. The negative electrode of the light emitter of the first optocoupler is connected to the positive electrode of the light emitter through the eleventh resistor; the negative electrode of the light emitter is also connected to the first end of the twelfth resistor, and the second end of the twelfth resistor is grounded; the first end of the light receiver of the first optocoupler is the output end of the flag signal receiving circuit; the second end of the light receiver of the first optocoupler is grounded; the first end of the twelfth capacitor is connected to the first end of the light receiver, and the second end of the twelfth capacitor is connected to the second end of the light receiver; the first end of the ninth resistor is connected to the first end of the light receiver, and the second end of the ninth resistor is used to receive the power supply voltage signal.

[0021] In a possible design, the signal receiving circuit includes a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a fourteenth capacitor, and a second optocoupler.

[0022] The first end of the sixteenth resistor is used to be connected to the positive pole of the control signal output end of the smart meter. The second end of the sixteenth resistor is connected to the positive electrode of the light emitter. The negative electrode of the light emitter is connected to the second end of the eighteenth resistor. The first end of the eighteenth resistor is used to be connected to the negative pole of the control signal output end of the smart meter.

[0023] The first end of the light receiver of the second optocoupler is the output end of the signal receiving circuit; the second end of the light receiver of the second optocoupler is grounded; the first end of the fourteenth capacitor is connected to the first end of the light receiver of the second optocoupler, and the second end of the fourteenth capacitor is connected to the second end of the light receiver of the second optocoupler; the first end of the fifteenth resistor is connected to the first end of the light receiver of the second optocoupler, and the second end of the fifteenth resistor is used to receive the power supply voltage signal.

[0024] In a possible design, the control circuit further includes a light emitting diode and a fourteenth resistor; the first end of the fourteenth resistor is used to receive the power supply voltage signal, the second end of the fourteenth resistor is connected to the positive electrode of the light emitting diode, and the negative electrode of the light emitting diode is connected to the control unit.

[0025] In a possible design, the control circuit further includes a standby receiving circuit; the standby receiving circuit includes a sixth resistor, a seventh resistor, an eighth resistor, an eighth capacitor and a third optocoupler;

[0026] The positive electrode of the light emitter of the third optocoupler is the input end of the standby receiving circuit, the positive electrode of the light emitter of the third optocoupler is connected to the smart meter, the negative electrode of the light emitter of the third optocoupler is connected to the positive electrode of the light emitter through the seventh resistor; the negative electrode of the light emitter is also connected to the first end of the eighth resistor, and the second end of the eighth resistor is grounded; the first end of the light receiver of the third optocoupler is the output end of the standby receiving circuit; the second end of the light receiver of the third optocoupler is grounded; the first end of the eighth capacitor is connected to the first end of the light receiver, and the second end of the eighth capacitor is connected to the second end of the light receiver; the first end of the sixth resistor is connected to the first end of the light receiver, and the second end of the sixth resistor is used to receive the power supply voltage signal.

[0027] In a second aspect, the present application further provides a prepaid reclosing control device, and the control device includes the control circuit as described in any one of the above.

[0028] According to the control circuit provided in the first aspect above, when the smart meter detects that the user's balance is exhausted or a circuit failure occurs, the signal receiving circuit can receive the control signal output by the smart meter, and thus output a corresponding shunt signal to the control unit to control the relay to disconnect. After the user recharges and pays or the fault is eliminated, the signal receiving circuit can receive the control signal output by the smart meter, and thus output a corresponding closing signal to the control unit to control the relay to close. In this way, manual on-site operation is not required, which improves the overall operation efficiency of the power grid system and saves labor costs at the same time.

[0029] The beneficial effects provided in the above-mentioned second aspect and each possible design of the second aspect can refer to the beneficial effects brought by the above-mentioned first aspect and each possible implementation manner of the first aspect, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the prepaid reclosing control circuit structure provided by the embodiment of the present application;

[0031] Figure 2 Schematic diagram of the smart meter structure provided by the embodiment of the present application;

[0032] Figure 3 Schematic diagram of the power supply circuit structure provided by the embodiment of the present application;

[0033] Figure 4 Schematic diagram of the flag signal receiving circuit structure provided by the embodiment of the present application;

[0034] Figure 5 Schematic diagram of the signal receiving circuit structure provided by the embodiment of the present application;

[0035] Figure 6 Schematic diagram of the standby receiving circuit structure provided by the embodiment of the present application;

[0036] Figure 7 Schematic diagram of the control chip and the driver chip provided by the embodiment of the present application;

[0037] Figure 8 Schematic diagram of the relay module structure provided by the embodiment of the present application.

[0038] Reference numerals: 10 - control unit, 20 - signal receiving circuit, 30 - relay driving circuit, 40 - power supply circuit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] In this application, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the relationship between associated objects and indicates that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, or B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following" or a similar expression refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a alone, b alone, or c alone can mean: a alone, b alone, c alone, the combination of a and b, the combination of a and c, the combination of b and c, or the combination of a, b, and c, where a, b, and c can be single or multiple. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0040] The orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to this application.

[0041] The terms "connected" and "coupled" should be understood in a broad sense. For example, the "connection" or "coupling" of a circuit structure can refer not only to a physical connection but also to an electrical connection or a signal connection. For example, it can be a direct connection, that is, a physical connection, or it can be indirectly connected through at least one intermediate element, as long as the circuit is connected. It can also be the connection inside two elements; a signal connection can refer not only to a signal connection through a circuit but also to a signal connection through a media medium, such as radio waves. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. It should be noted that in the drawings of this application, signal terminals with the same name are connected to each other.

[0042] In the related art, when the user account is in arrears or the circuit fails, the relay is cut off immediately, and after the user recharges and pays or the fault is eliminated, manual closing is required to restore power supply. This method of relying on manual closing increases labor costs, and at the same time, the timeliness of manual closing is poor, reducing the overall operating efficiency of the power grid system.

[0043] To overcome the above defects in the related art, this application provides a pre-payment reclosing control circuit and a control device. Figure 1 This is a schematic diagram of the pre-payment reclosing control circuit structure provided by the embodiments of this application. Figure 2The following is a schematic diagram of the structure of the smart meter provided by the embodiments of this application. Please refer to Figure 1 and Figure 2 As shown, the control circuit includes a control unit 10, a signal receiving circuit 20, and a relay driving circuit 30. Among them, the input end of the signal receiving circuit 20 is connected to the control signal output end of the smart meter, the output end of the signal receiving circuit 20 is connected to the control unit 10, the control signal output pin of the control unit 10 is connected to the input end of the relay driving circuit 30, and the output end of the relay driving circuit 30 is connected to the control end of the relay. Among them, the signal receiving circuit 20 is used to receive the control signal output by the smart meter and convert the control signal into a digital signal for output to the control unit 10; the control unit 10 is used to output a corresponding drive control signal to the relay driving circuit 30 according to the control signal; the relay driving circuit 30 is used to output a corresponding drive signal according to the drive control signal to drive the relay to act.

[0044] According to the control circuit provided by this application, when the smart meter detects that the user balance is exhausted or a circuit failure occurs, the signal receiving circuit 20 can receive the control signal output by the smart meter, so as to output a corresponding shunt signal to the control unit 10 to control the relay to disconnect. After the user recharges and pays or the fault is eliminated, the signal receiving circuit 20 can receive the control signal output by the smart meter, so as to output a corresponding closing signal to the control unit 10 to control the relay to close. In this way, manual on-site operation is not required, the overall operation efficiency of the power grid system is improved, and the labor cost is saved at the same time.

[0045] In some embodiments, the pre-payment reclosing control circuit further includes a power supply circuit 40; the input end of the power supply circuit 40 is used to connect to a power supply, and the output end of the power supply circuit 40 is connected to the control unit 10, the relay driving circuit 30, and the relay; the power supply circuit 40 is used to process the electrical signal output by the power supply and then supply power to the control unit 10 and the relay driving circuit 30.

[0046] In some embodiments, the power supply circuit includes a rectifier circuit, a filter circuit, and a voltage conversion chip; the input end of the rectifier circuit is used to connect to a power supply, the output end of the rectifier circuit is connected to the input end of the filter circuit, the output end of the filter circuit is connected to the input pin of the voltage conversion chip, and the output end of the voltage conversion chip is connected to the power supply pin of the control unit 10. Among them, the rectifier circuit is used to convert the alternating current signal output by the power supply into a direct current signal; the filter circuit is used to filter the direct current signal output by the rectifier circuit; the voltage conversion chip is used to perform voltage conversion on the direct current signal, for example, convert 24V to 3.3V, and then supply it to the control unit 10.

[0047] Figure 3Schematic diagram of the power supply circuit structure provided by the embodiment of the present application, please refer to Figure 3 As shown, the rectifier circuit in the power supply circuit can adopt the common rectifier chip DB1. Among them, please refer to Figure 3 As shown, the filter circuit includes the fifth capacitor C5, the sixth capacitor C6 and the first resistor R1. The fifth capacitor C5, the sixth capacitor C6 and the first resistor R1 form an RC filter circuit to filter out the clutter in the circuit. Among them, the voltage conversion chip U1 in this embodiment can adopt the voltage conversion chip commonly used in the field, which will not be elaborated here.

[0048] Among them, the power supply circuit further includes a varistor RV1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a seventh capacitor C7, a second resistor R2, a fifth resistor R5 and a first inductor L1. The positive pole of the output end of the rectifier circuit is connected to the first end of the varistor RV1, the negative pole of the output end of the rectifier chip DB1 is connected to the second end of the varistor RV1, the first end of the fourth capacitor C4 is connected to the first end of the varistor RV1, the second end of the fourth capacitor C4 is connected to the second end of the varistor RV1, the first end of the fifth capacitor C5 is connected to the first end of the fourth capacitor C4, the second end of the fifth capacitor C5 is connected to the second end of the fourth capacitor C4, the first end of the sixth capacitor C6 is connected to the first end of the fifth capacitor C5, and the second end of the sixth capacitor C6 is connected to the second end of the fifth capacitor C5; the second end of the sixth capacitor C6 is grounded to GND. Among them, the varistor RV1 is used for voltage clamping when the circuit withstands overvoltage, and absorbs the excess current to protect the sensitive components. The fourth capacitor C4 is used for energy storage, and the voltage at one end of the fourth capacitor C4 is Vin.

[0049] Among them, the first end of the first resistor R1 is connected to the first end of the sixth capacitor C6; the second end of the first resistor R1 is connected to the enable pin EN of the voltage conversion chip U1; the first end of the sixth capacitor C6 is connected to the power input pin VIN of the voltage conversion chip U1, the switch control pin of the voltage conversion chip U1 is connected to the first end of the third capacitor C3, and the second end of the third capacitor C3 is connected to the self-boost pin BST of the voltage conversion chip U1; the output voltage feedback pin of the voltage conversion chip U1 is connected to the first end of the fifth resistor R5, and the second end of the fifth resistor R5 is grounded; the first end of the second resistor R2 is connected to the output voltage feedback pin FB, and the second end is used to output the supply voltage signal VCC; the seventh capacitor C7 is connected in parallel across the second resistor R2, and the seventh capacitor C7 also plays a role in filtering. Among them, the first end of the first inductor L1 is connected to the first end of the third capacitor C3, the second end of the first inductor L1 is connected to the first end of the first capacitor C1, and the second end of the first capacitor C1 is grounded; the first end of the second capacitor C2 is connected to the first end of the first capacitor C1, and the second end of the second capacitor C2 is grounded. The second end of the first inductor L1 is also used to output the supply voltage signal VCC. Among them, the voltage conversion chip U1 is used to convert the input DC electrical signal, for example, convert 24V into 3.3V (i.e., VCC), and then supply it to the control unit 10.

[0050] In some embodiments, the control circuit further includes a flag signal receiving circuit. The input end of the flag signal receiving circuit is connected to the flag signal output end of the smart meter, and the output end of the flag signal receiving circuit is connected to the control unit 10; the flag signal receiving circuit is used to receive the flag signal output by the smart meter and convert the flag signal into a corresponding digital signal; the flag signal is used to represent the validity of the control signal output by the signal receiving circuit. For example, if the flag signal is 1, it means that the control signal output by the signal receiving circuit is valid, and if the flag signal is 0, it means that the control signal output by the signal receiving circuit is invalid, thus avoiding signal mis-triggering.

[0051] Figure 4 For the structural schematic diagram of the flag signal receiving circuit provided by the embodiments of the present application, please refer to Figure 4As shown in the figure, the flag signal receiving circuit includes a ninth resistor R9, an eleventh resistor R11, a twelfth resistor R12, a twelfth capacitor C12, and a first optocoupler U2; the positive electrode of the light emitter of the first optocoupler U2 is the input terminal Iin2 of the flag signal receiving circuit, and the positive electrode of the light emitter of the first optocoupler U2 is connected to the smart meter. For example, the input terminal of the flag signal receiving circuit is connected to the No. 6 terminal on the smart meter. The negative electrode of the light emitter of the first optocoupler U2 is connected to the positive electrode of the light emitter through the eleventh resistor R11; the negative electrode of the light emitter is also connected to the first end of the twelfth resistor R12, and the second end of the twelfth resistor R12 is grounded; the first end of the light receiver of the first optocoupler U2 is the output terminal Iout2 of the flag signal receiving circuit; the second end of the light receiver of the first optocoupler U1 is grounded; the first end of the twelfth capacitor C12 is connected to the first end of the light receiver, and the second end of the twelfth capacitor C12 is connected to the second end of the light receiver; the first end of the ninth resistor R9 is connected to the first end of the light receiver, and the second end of the ninth resistor R9 is used to receive the power supply voltage signal VCC. The output terminal Iout2 of the flag signal receiving circuit is used to output the converted digital signal for characterizing the validity of the control signal.

[0052] Figure 5 The following is a schematic diagram of the signal receiving circuit provided by the embodiment of the present application. Please refer to Figure 5 As shown in the figure, in some embodiments, the signal receiving circuit includes a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a fourteenth capacitor C14, and a second optocoupler U3. The first end of the sixteenth resistor R16 is used to connect to the positive electrode of the control signal output terminal of the smart meter. The second end of the sixteenth resistor R16 is connected to the positive electrode of the light emitter, and the negative electrode of the light emitter is connected to the second end of the eighteenth resistor R18. The first end of the eighteenth resistor R18 is used to connect to the negative electrode of the control signal output terminal of the smart meter. For example, the input terminals Iin3 and Iin4 of the signal receiving circuit are connected to Figure 2 the No. 7 and No. 8 terminals on the smart meter shown in the figure. The first end of the light receiver of the second optocoupler is the output terminal Iout3 of the signal receiving circuit; the second end of the light receiver of the second optocoupler U3 is grounded; the first end of the fourteenth capacitor C14 is connected to the first end of the light receiver of the second optocoupler U3, and the second end of the fourteenth capacitor C14 is connected to the second end of the light receiver of the second optocoupler U13; the first end of the fifteenth resistor R15 is connected to the first end of the light receiver of the second optocoupler U3, and the second end of the fifteenth resistor R15 is used to receive the power supply voltage signal VCC.

[0053] Among them, the signal receiving circuit converts the differential signals input at the input terminals Iin3 and Iin4 into a digital type control signal, and then outputs it from the output terminal Iout3 to the control unit 10.

[0054] In some embodiments, the control circuit further includes a standby receiving circuit. The input end of the standby receiving circuit is also connected to the smart meter, and the output end of the standby receiving circuit is connected to the control unit 10. The standby receiving circuit can be user-defined to receive a certain signal and transmit it to the control unit 10.

[0055] Figure 6 For the structural schematic diagram of the standby receiving circuit provided by the embodiments of the present application, please refer to Figure 6 As shown, the standby receiving circuit includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, an eighth capacitor C8, and a third optocoupler U4. The positive electrode of the light emitter of the third optocoupler U4 is the input end Iin1 of the standby receiving circuit, and the input end Iin1 of the standby receiving circuit can be connected to the terminal 5 on the smart meter. The positive electrode of the light emitter of the third optocoupler U4 is connected to the smart meter, and the negative electrode of the light emitter of the third optocoupler U4 is connected to the positive electrode of the light emitter through the seventh resistor R7. The negative electrode of the light emitter is also connected to the first end of the eighth resistor R8, and the second end of the eighth resistor R8 is grounded. The first end of the light receiver of the third optocoupler U4 is the output end of the standby receiving circuit. The second end of the light receiver of the third optocoupler U4 is grounded. The first end of the eighth capacitor C8 is connected to the first end of the light receiver, and the second end of the eighth capacitor C8 is connected to the second end of the light receiver. The first end of the sixth resistor R6 is connected to the first end of the light receiver, and the second end of the sixth resistor R6 is used to receive the power supply voltage signal VCC.

[0056] Among them, the control unit 10 in this embodiment is a control chip, and the relay drive circuit 30 can also be a drive chip. For example, the control unit 10 can adopt a single-chip microcomputer or an MCU (Microcontroller Unit). Figure 7 For the structural schematic diagram of the control chip and the drive chip provided by the embodiments of the present application, please refer to Figure 7 As shown, the 38th - 40th pins of the control chip U5 are respectively connected to the output ends Iout1, Iout2, and Iout3. The 32nd - 34th pins of the control chip U5 are connected to the signal input pins of the drive chip U6, and the drive signal output pins of the drive chip U6 are respectively used to output drive signals.

[0057] Among them, the control circuit further includes a light-emitting diode VD3 and a fourteenth resistor R14. The first end of the fourteenth resistor R14 is used to receive the power supply voltage signal. The second end of the fourteenth resistor R14 is connected to the positive electrode of the light-emitting diode VD3, and the negative electrode of the light-emitting diode VD3 is connected to the control chip U5. The light-emitting diode VD3 can be used as a signal display lamp to display a certain signal state of the circuit. For example, the light-emitting diode VD3 is used to display the fault or normal state of the circuit.

[0058] Figure 8For the structural schematic diagram of the relay module provided by the embodiment of the present application, please refer to Figure 8 As shown, the relay module may include three relays, namely K1, K2, and K3. The control terminal RELAY1 of relay K1 is connected to the 8th pin of the drive chip U6, the control terminal RELAY2 of relay K2 is connected to the 7th pin of the drive chip U6, and the control terminal RELAY3 of relay K3 is connected to the 6th pin of the drive chip U6.

[0059] It can be understood that the general control chip U5 will also include some related peripheral circuits, such as Figure 7 As shown, capacitors C9, C11, and C12 form a peripheral circuit. Capacitors C9, C11, and C12 are connected in parallel, and one end is connected to the power supply VCC, and the other end is grounded to GND. The power supply terminal NRST of the control chip U5 is connected to the power supply VCC through the resistor R13 and grounded through the capacitor C13. The ground pin of the control chip U5 is also grounded to GND through the resistor R10.

[0060] It can be seen that by using the prepaid reclosing control circuit provided in this embodiment, when the smart meter detects that the user's balance is exhausted or a circuit failure occurs, the signal receiving circuit 20 can receive the control signal output by the smart meter, and thus output a corresponding shunt signal to the control unit 10 to control the relay to disconnect. After the user recharges and pays or the fault is eliminated, the signal receiving circuit 20 can receive the control signal output by the smart meter, and thus output a corresponding closing signal to the control unit 10 to control the relay to close. In this way, manual on-site operation is not required, which improves the overall operation efficiency of the power grid system and saves labor costs at the same time.

[0061] The embodiment of the present application also provides a prepaid reclosing control device. The control device includes the control circuit as described above. In addition, the control device may also include related structures such as a box body and a wiring terminal, which will not be elaborated here.

[0062] Finally, it should be noted that the above embodiments are only specific implementation manners of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A prepaid reclosing control circuit, characterized in that, The control circuit includes a control unit, a signal receiving circuit, and a relay driving circuit; The input end of the signal receiving circuit is connected to the control signal output end of the smart meter. The output end of the signal receiving circuit is connected to the control unit. The control signal output pin of the control unit is connected to the input end of the relay driving circuit. The output end of the relay driving circuit is connected to the control end of the relay; Among them, the signal receiving circuit is used to receive the control signal output by the smart meter and convert the control signal into a digital signal for output to the control unit. The control unit is used to output a corresponding drive control signal to the relay driving circuit according to the control signal. The relay driving circuit is used to output a corresponding drive signal according to the drive control signal to drive the relay to act.

2. The prepaid reclosing control circuit according to claim 1, wherein The control circuit further includes a power supply circuit; The input end of the power supply circuit is used to connect to a power supply. The output end of the power supply circuit is connected to the control unit and the relay driving circuit; The power supply circuit is used to process the electrical signal output by the power supply and then supply power to the control unit and the relay driving circuit.

3. The prepaid reclosing control circuit according to claim 2, wherein The power supply circuit includes a rectifier circuit, a filter circuit, and a voltage conversion chip; The input end of the rectifier circuit is used to connect to the power supply. The output end of the rectifier circuit is connected to the input end of the filter circuit. The output end of the filter circuit is connected to the input pin of the voltage conversion chip. The output end of the voltage conversion chip is connected to the power supply pin of the control unit; Among them, the rectifier circuit is used to convert the alternating current signal output by the power supply into a direct current signal. The filter circuit is used to filter the direct current signal output by the rectifier circuit. The voltage conversion chip is used to convert the voltage of the direct current signal.

4. The prepaid reclosing control circuit according to claim 3, wherein, The power supply circuit further includes a varistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a seventh capacitor, a second resistor, a fifth resistor, and a first inductor. The filter circuit includes a fifth capacitor, a sixth capacitor, and a first resistor; The positive pole of the output end of the rectifier circuit is connected to the first end of the varistor. The negative pole of the output end of the rectifier circuit is connected to the second end of the varistor. The first end of the fourth capacitor is connected to the first end of the varistor. The second end of the fourth capacitor is connected to the second end of the varistor. The first end of the fifth capacitor is connected to the first end of the fourth capacitor. The second end of the fifth capacitor is connected to the second end of the fourth capacitor. The first end of the sixth capacitor is connected to the first end of the fifth capacitor. The second end of the sixth capacitor is connected to the second end of the fifth capacitor. The second end of the sixth capacitor is grounded; The first end of the first resistor is connected to the first end of the sixth capacitor; the second end of the first resistor is connected to the enable pin of the voltage conversion chip; the first end of the sixth capacitor is connected to the power input pin of the voltage conversion chip, the switch control pin of the voltage conversion chip is connected to the first end of the third capacitor, and the second end of the third capacitor is connected to the self-boost pin of the voltage conversion chip; the output voltage feedback pin of the voltage conversion chip is connected to the first end of the fifth resistor, and the second end of the fifth resistor is grounded; the first end of the second resistor is connected to the output voltage feedback pin, and the second end is used to output a power supply voltage signal; the seventh capacitor is connected in parallel across the two ends of the second resistor. The first end of the first inductor is connected to the first end of the third capacitor, the second end of the first inductor is connected to the first end of the first capacitor, and the second end of the first capacitor is grounded; the first end of the second capacitor is connected to the first end of the first capacitor, and the second end of the second capacitor is grounded.

5. The prepaid reclosing control circuit according to any one of claims 1-4, characterized in that, The control circuit further includes a flag signal receiving circuit, the input end of the flag signal receiving circuit is connected to the flag signal output end of the smart meter, and the output end of the flag signal receiving circuit is connected to the control unit. The flag signal receiving circuit is configured to receive the flag signal output by the smart meter and convert the flag signal into a corresponding digital signal; the flag signal is used to characterize the validity of the control signal output by the signal receiving circuit.

6. The prepaid reclosing control circuit according to claim 5, characterized in that, The flag signal receiving circuit includes a ninth resistor, an eleventh resistor, a twelfth resistor, a twelfth capacitor, and a first optocoupler. The positive electrode of the emitter of the first optocoupler is the input end of the flag signal receiving circuit, the positive electrode of the emitter of the first optocoupler is connected to the smart meter, the negative electrode of the emitter of the first optocoupler is connected to the positive electrode of the emitter through the eleventh resistor; the negative electrode of the emitter is also connected to the first end of the twelfth resistor, and the second end of the twelfth resistor is grounded; the first end of the receiver of the first optocoupler is the output end of the flag signal receiving circuit; the second end of the receiver of the first optocoupler is grounded; the first end of the twelfth capacitor is connected to the first end of the receiver, and the second end of the twelfth capacitor is connected to the second end of the receiver; the first end of the ninth resistor is connected to the first end of the receiver, and the second end of the ninth resistor is used to receive the power supply voltage signal.

7. The prepaid reclosing control circuit according to any one of claims 1-4, characterized in that, The signal receiving circuit includes a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a fourteenth capacitor, and a second optocoupler. The first end of the sixteenth resistor is used to be connected to the positive pole of the control signal output end of the smart meter, the second end of the sixteenth resistor is connected to the positive electrode of the emitter, the negative electrode of the emitter is connected to the second end of the eighteenth resistor, and the first end of the eighteenth resistor is used to be connected to the negative pole of the control signal output end of the smart meter. The first end of the light receiver of the second optocoupler is the output end of the signal receiving circuit; the second end of the light receiver of the second optocoupler is grounded; the first end of the fourteenth capacitor is connected to the first end of the light receiver of the second optocoupler, and the second end of the fourteenth capacitor is connected to the second end of the light receiver of the second optocoupler; the first end of the fifteenth resistor is connected to the first end of the light receiver of the second optocoupler, and the second end of the fifteenth resistor is used to receive the power supply voltage signal.

8. The prepaid reclosing control circuit according to any one of claims 1-4, characterized in that, The control circuit further includes a light-emitting diode and a fourteenth resistor; the first end of the fourteenth resistor is used to receive the power supply voltage signal, the second end of the fourteenth resistor is connected to the positive electrode of the light-emitting diode, and the negative electrode of the light-emitting diode is connected to the control unit.

9. The prepaid reclosing control circuit according to any one of claims 1-4, characterized in that, The control circuit further includes a standby receiving circuit; the standby receiving circuit includes a sixth resistor, a seventh resistor, an eighth resistor, an eighth capacitor and a third optocoupler. The positive electrode of the light emitter of the third optocoupler is the input end of the standby receiving circuit, the positive electrode of the light emitter of the third optocoupler is connected to the smart meter, and the negative electrode of the light emitter of the third optocoupler is connected to the positive electrode of the light emitter through the seventh resistor; the negative electrode of the light emitter is also connected to the first end of the eighth resistor, and the second end of the eighth resistor is grounded; the first end of the light receiver of the third optocoupler is the output end of the standby receiving circuit; the second end of the light receiver of the third optocoupler is grounded; the first end of the eighth capacitor is connected to the first end of the light receiver, and the second end of the eighth capacitor is connected to the second end of the light receiver; the first end of the sixth resistor is connected to the first end of the light receiver, and the second end of the sixth resistor is used to receive the power supply voltage signal.

10. A prepaid reclosing control device, characterized in that, The control device includes the control circuit according to any one of claims 1-9.

Images