CN212367219U - PLC (programmable logic controller) driving circuit of photovoltaic shutoff device - Google Patents
PLC (programmable logic controller) driving circuit of photovoltaic shutoff device Download PDFInfo
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- CN212367219U CN212367219U CN202021083523.4U CN202021083523U CN212367219U CN 212367219 U CN212367219 U CN 212367219U CN 202021083523 U CN202021083523 U CN 202021083523U CN 212367219 U CN212367219 U CN 212367219U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The utility model discloses a photovoltaic shutoff PLC drive circuit, including photovoltaic module, input capacitance C1, switch tube Q1, freewheeling diode D1, first output resistance R1, output capacitance C2, second output resistance R2, PLC signal acquisition circuit, first output terminal and second output terminal; the PLC signal acquisition circuit comprises a signal acquisition inductor L1, a signal acquisition resistor R2 and a signal acquisition capacitor C3; the voltage signal of the PLC signal acquisition circuit passes through the PLC signal amplification processing circuit module and the signal driving switch circuit and then is connected with the grid of the switch tube Q1; the cathode of the freewheeling diode D1 is connected with the first output terminal, the anode of the freewheeling diode D1 is connected with the drain of the switching tube Q1, and the output capacitor C2 is connected in series with the first output resistor R1 and then connected in parallel with the freewheeling diode D1. The utility model discloses not only can satisfy the quick turn-off safety requirement, the reliability is high moreover, and response speed is fast, and is with low costs, efficient.
Description
Technical Field
The utility model relates to a photovoltaic drive circuit especially relates to a photovoltaic shutoff PLC drive circuit.
Background
Fast turn-off is a photovoltaic plant safety protection concept introduced from the united states. The quick turn-off concept is provided for protecting installation and maintenance personnel of fire fighters and photovoltaic power stations, because the direct current side of the photovoltaic power station has direct current high voltage, as long as the direct current side is irradiated by the sun, the direct current high voltage on the battery board side always exists, and once the photovoltaic power station is in fire, the fire fighters cannot carry out fire extinguishing and emergency rescue work before the whole power station is burnt out.
Therefore, both the us national electrical specifications NEC 2014 and NEC 2017 set forth clear requirements for rapid dc-side shutdown of photovoltaic power plants. Will begin formal execution on 1/1 of 2019. NEC 2017 specifies: "outside the cluster, the controller is installed within 0.3 meters from the array and within more than 1 meter from the access point, after using the fast shut-down, the system takes 30 seconds to drop to 30V; within the cluster, the voltage is reduced to 80V within 30 seconds, and safety rescue measures are conveniently taken. "
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a photovoltaic shutoff PLC drive circuit is provided, can satisfy the quick turn-off safety requirement, can guarantee the security and the reliability of system.
The utility model provides a technical scheme who adopts for solving above-mentioned technical problem provides a photovoltaic shutoff PLC drive circuit, including photovoltaic module, input capacitance C1, switch tube Q1, freewheeling diode D1, first output resistance R1, output capacitance C2, second output resistance R2, PLC signal acquisition circuit, first output terminal and second output terminal; the PLC signal acquisition circuit comprises a signal acquisition inductor L1, a signal acquisition resistor R2 and a signal acquisition capacitor C3, wherein the signal acquisition resistor R2 and the signal acquisition capacitor C3 are connected in series and then are connected in parallel with the signal acquisition inductor L1; the voltage signal of the PLC signal acquisition circuit passes through the PLC signal amplification processing circuit module and the signal driving switch circuit and then is connected with the grid of the switch tube Q1; the input capacitor C1 is connected with the photovoltaic module in parallel, the positive electrode of the photovoltaic module is connected with the first output terminal, the negative electrode of the photovoltaic module is connected with the source electrode of the switching tube Q1, the drain electrode of the switching tube Q1 is connected with one end of the signal acquisition inductor L1, and the other end of the signal acquisition inductor L1 is connected with the second output terminal; the cathode of the freewheeling diode D1 is connected with the first output terminal, the anode of the freewheeling diode D1 is connected with the drain of the switching tube Q1, and the output capacitor C2 is connected in series with the first output resistor R1 and then connected in parallel with the freewheeling diode D1.
Furthermore, the input end of the PLC signal amplification processing circuit module is a voltage signal PLC1 and a PLC2 of the PLC signal acquisition circuit, and the output end of the PLC signal amplification processing circuit module is connected with a signal amplification resistor R3; the signal amplification resistor R3 is connected in series with a capacitor C4, an inductor L2, an inductor L3 and a capacitor C6, the other end of the capacitor C6 is grounded, two ends of the inductor L3 are connected in parallel with an amplification processing capacitor C5, and a voltage signal of a connection point between the inductor L2 and the inductor L3 is an output signal PLC _ AD.
Furthermore, the capacitor C4, the inductor L2, the inductor L3, the capacitor C4, the capacitor C6 and the capacitor C5 form a band-pass filter, and the center frequency of the band-pass filter is 100KHZ to 160 KZ.
Further, the signal driving switch circuit comprises a voltage comparator, a switch tube Q2, a switch tube Q3 and a switch tube Q4, one input signal of the voltage comparator is the output signal PLC _ AD, the other input signal is a reference voltage Vref, an output end of the voltage comparator is connected with one end of a capacitor C7, the capacitor C7 is connected with a diode D2, a resistor R5 and a resistor R6 in series, a base of the switch tube Q2 is connected with the other end of the resistor R6, and an emitter of the switch tube Q2 is connected with ground; the intersection point of the capacitor C7 and the diode D2 is grounded through a resistor R4, and the intersection point of the resistor R5 and the resistor R6 is grounded through a capacitor C8; the collector of the switch tube Q2 is connected with one end of a resistor R8, and the other end of the resistor R8 is connected with the base of the switch tube Q4; a collector of the switching tube Q4 is connected with a power supply VCC, and a resistor R7 is connected between a base and the collector of the switching tube Q4; the emitter of the switching tube Q4 is connected in series with the resistor R11 and the resistor R9 to drive the switching tube Q1; the collector of the switching tube Q3 is connected with the intersection point of the resistor R11 and the resistor R9, the emitter of the switching tube Q3 is connected with the ground, the base of the switching tube Q3 is connected with one end of the resistor R10, and the other end of the resistor R10 is connected with the control signal EN.
Further, when the freewheeling diode D1 has no forward current, the impedance between the first output terminal and the second output terminal is in the range of 0.75-1.5 ohms.
The utility model discloses contrast prior art has following beneficial effect: the utility model provides a photovoltaic shutoff PLC drive circuit not only can satisfy the quick turn-off safety requirement, and the reliability is high moreover, and response speed is fast, and is with low costs, efficient.
Drawings
Fig. 1 is a power output circuit of a PLC driving circuit of a photovoltaic shutdown device according to an embodiment of the present invention;
fig. 2 is a PLC signal amplification processing circuit of the PLC driving circuit of the photovoltaic shutdown device in the embodiment of the present invention;
fig. 3 is a PLC signal driving switch circuit of the PLC driving circuit of the photovoltaic shutdown device according to an embodiment of the present invention;
fig. 4 is a power supply and control module of the PLC driving circuit of the photovoltaic shutdown device in an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
Referring to fig. 1, a PLC driving circuit of a photovoltaic breaker according to an embodiment of the present invention includes a photovoltaic module, an input capacitor C1, a switching tube Q1, a freewheeling diode D1, a first output resistor R1, an output capacitor C2, a second output resistor R2, a PLC signal acquisition circuit, a first output terminal, and a second output terminal; the PLC signal acquisition circuit comprises a signal acquisition inductor L1, a signal acquisition resistor R2 and a signal acquisition capacitor C3, wherein the signal acquisition resistor R2 and the signal acquisition capacitor C3 are connected in series and then are connected in parallel with the signal acquisition inductor L1; the input capacitor C1 is connected with the photovoltaic module in parallel, the positive pole of the photovoltaic module is connected with the first output terminal 1-1, the negative pole of the photovoltaic module is connected with the source electrode of the switch tube Q1, the drain electrode of the switch tube Q1 is connected with one end of the signal acquisition inductor L1, the other end of the signal acquisition inductor L1 is connected with the second output terminal 1-2, and the second output resistor R2 and the signal acquisition capacitor C3 are connected in series and then connected with the signal acquisition inductor L1 in parallel; the cathode of the freewheeling diode D1 is connected with the first output terminal 1-1, the anode of the freewheeling diode D1 is connected with the drain of the switching tube Q1, and the output capacitor C2 is connected with the first output resistor R1 in series and then connected with the freewheeling diode D1 in parallel.
The utility model discloses signal acquisition resistance R2 and electric capacity C3 after establishing ties parallelly connected this kind of method with signal acquisition inductance L1 can make parallelly connected back impedance control 0.75-1.5 ohm in the requirement range on the basis that inductance L1 is little, and the advantage lies in that inductance L1 is little, and the loss is little, and it is low to generate heat, and system reliability is good. The output capacitor C2 is connected with the first output resistor R1 in series and then connected with the freewheeling diode D1 in parallel, so that under the condition that the diode has no forward current, the impedance between the first output terminal 1-1 and the second output terminal 1-2 can be in a required range of 0.75-1.5 ohm, and the series connection of the capacitor and the resistor has the advantages that the reliability of a system can be improved, and serious heating caused by capacitor failure can be avoided; the impedance range between the first output terminal 1-1 and the second output terminal 1-2 can be adjusted through the resistor; an optional set of values is: inductance L1 takes the value of 0.75uH, resistance R2 is 0.4 ohm, electric capacity C3 is 1uf, resistance R1 is 0.6 ohm, electric capacity C2 is 1 uf.
Referring to fig. 2, the input of the PLC signal amplification processing circuit module of the embodiment of the present invention is the voltage signal PLC1 and PLC2 of the PLC signal acquisition circuit, and the output is connected to the signal amplification resistor R3; the signal amplification resistor R3, the capacitor C4, the inductor L2, the inductor L3 and the capacitor C6 are connected in series, the other end of the capacitor C6 is grounded, the signal amplification capacitor C5 is connected with the inductor L3 in parallel, and the output signal PLC _ AD is a voltage signal of a connection point between the inductor L2 and the inductor L3. That is, the inductor L2, the inductor L3, the capacitor C4, the capacitor C6 and the capacitor C5 form a band-pass filter, and the maximum value of the output signal PLC _ AD is smaller than the reference voltage Vref after the signal with the center frequency of 130Khz, larger than 160KZ and smaller than 100Khz passes through the circuit.
Referring now to fig. 3, the signal driving switch circuit of the embodiment of the present invention includes a voltage comparator U1, a switch Q2, a switch Q3 and a switch Q4, wherein the input signal of the voltage comparator U1 is the signal PLC _ AD and the input reference voltage Vref, the output signal of the voltage comparator U1 is CPU _ CAP, the output of the voltage comparator U1 is connected to one end of a capacitor C7, the capacitor C7, a diode D2, a resistor R5 and a resistor R6 are connected in series, the other end of the resistor R6 is connected to the base of the switch Q2, and the emitter of the switch Q2 is connected to ground; one end of the resistor R4 is connected with the intersection point of the capacitor C7 and the diode D2, the other end of the resistor R4 is connected with the ground, the capacitor C8 is connected with the intersection point of the resistor R5 and the resistor R6, and the other end of the capacitor C8 is connected with the ground; one end of the resistor R8 is connected with the collector of the switch tube Q2, and the other end is connected with the base of the switch tube Q4; the collector of the switching tube Q4 is connected with a power supply VCC, and a resistor R7 is connected in parallel with the base and the collector of the switching tube Q4; the emitter of the switching tube Q4 is connected in series with the resistor R11 and the resistor R9 to drive the switching tube Q1; the collector of the switching tube Q3 is connected with the intersection point of the resistor R11 and the resistor R9, the emitter of the switching tube Q3 is connected with the ground, the base of the switching tube Q3 is connected with one end of the resistor R10, and the other end of the resistor R10 is connected with the control signal EN.
The utility model discloses the circuit that electric capacity C7, electric capacity C8, diode D2, resistance R4, resistance R5 and resistance R6 of embodiment constitute only alternating signal output can drive switch tube Q2 (not limit the triode), avoids preceding stage trouble to cause voltage comparator U1 to output the potential safety hazard that the triode exists is opened to the high level; the high-low level of voltage comparator U1 output charges for electric capacity C8, R5, C8, R6 constitute and can make electric capacity C8 charge when having the PLC signal, when not having the PLC signal, electric capacity C8 discharges, can guarantee that 2 periods do not have the PLC signal, electric capacity C8's voltage can drive switch tube Q2, realize that the PLC signal opens switch tube Q1, do not have PLC signal definite time to close switch tube Q1.
With continuing reference to fig. 4, the input of the power supply + control unit of the embodiment of the present invention is the photovoltaic module VPV, the signal PLC _ AD and the signal CPU _ CAP; and outputting the power supply VCC and a control signal EN. When in use, the driving circuit can be controlled by an on/off control signal EN; the system can meet the requirement of quick turn-off safety, and has the advantages of high reliability, high response speed, low cost and high efficiency.
Although the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. The PLC driving circuit of the photovoltaic breaker is characterized by comprising a photovoltaic module, an input capacitor C1, a switching tube Q1, a freewheeling diode D1, a first output resistor R1, an output capacitor C2, a second output resistor R2, a PLC signal acquisition circuit, a first output terminal and a second output terminal;
the PLC signal acquisition circuit comprises a signal acquisition inductor L1, a signal acquisition resistor R2 and a signal acquisition capacitor C3, wherein the signal acquisition resistor R2 and the signal acquisition capacitor C3 are connected in series and then are connected in parallel with the signal acquisition inductor L1; the voltage signal of the PLC signal acquisition circuit passes through the PLC signal amplification processing circuit module and the signal driving switch circuit and then is connected with the grid of the switch tube Q1;
the input capacitor C1 is connected with the photovoltaic module in parallel, the positive electrode of the photovoltaic module is connected with the first output terminal, the negative electrode of the photovoltaic module is connected with the source electrode of the switching tube Q1, the drain electrode of the switching tube Q1 is connected with one end of the signal acquisition inductor L1, and the other end of the signal acquisition inductor L1 is connected with the second output terminal; the cathode of the freewheeling diode D1 is connected with the first output terminal, the anode of the freewheeling diode D1 is connected with the drain of the switching tube Q1, and the output capacitor C2 is connected in series with the first output resistor R1 and then connected in parallel with the freewheeling diode D1.
2. The PLC driving circuit of claim 1, wherein the input terminals of the PLC signal amplification processing circuit module are voltage signals PLC1 and PLC2 of a PLC signal acquisition circuit, and the output terminal of the PLC signal amplification processing circuit module is connected with a signal amplification resistor R3; the signal amplification resistor R3 is connected in series with a capacitor C4, an inductor L2, an inductor L3 and a capacitor C6, the other end of the capacitor C6 is grounded, two ends of the inductor L3 are connected in parallel with an amplification processing capacitor C5, and a voltage signal of a connection point between the inductor L2 and the inductor L3 is an output signal PLC _ AD.
3. The PLC driving circuit of claim 2, wherein the capacitor C4, the inductor L2, the inductor L3, the capacitor C4, the capacitor C6 and the capacitor C5 form a band-pass filter, and the center frequency of the band-pass filter is 100 KHZ-160 KZ.
4. The PLC driving circuit of claim 2, wherein the signal driving switch circuit comprises a voltage comparator, a switch tube Q2, a switch tube Q3 and a switch tube Q4, one input signal of the voltage comparator is the output signal PLC _ AD, the other input signal of the voltage comparator is a reference voltage Vref, an output end of the voltage comparator is connected with one end of a capacitor C7, the capacitor C7 is connected with a diode D2, a resistor R5 and a resistor R6 in series, a base of the switch tube Q2 is connected with the other end of a resistor R6, and an emitter of the switch tube Q2 is connected with ground; the intersection point of the capacitor C7 and the diode D2 is grounded through a resistor R4, and the intersection point of the resistor R5 and the resistor R6 is grounded through a capacitor C8; the collector of the switch tube Q2 is connected with one end of a resistor R8, and the other end of the resistor R8 is connected with the base of the switch tube Q4; a collector of the switching tube Q4 is connected with a power supply VCC, and a resistor R7 is connected between a base and the collector of the switching tube Q4; the emitter of the switching tube Q4 is connected in series with the resistor R11 and the resistor R9 to drive the switching tube Q1; the collector of the switching tube Q3 is connected with the intersection point of the resistor R11 and the resistor R9, the emitter of the switching tube Q3 is connected with the ground, the base of the switching tube Q3 is connected with one end of the resistor R10, and the other end of the resistor R10 is connected with the control signal EN.
5. The PLC driving circuit of claim 1, wherein the impedance between the first output terminal and the second output terminal ranges from 0.75 to 1.5 ohms when the freewheeling diode D1 has no forward current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021083523.4U CN212367219U (en) | 2020-06-12 | 2020-06-12 | PLC (programmable logic controller) driving circuit of photovoltaic shutoff device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021083523.4U CN212367219U (en) | 2020-06-12 | 2020-06-12 | PLC (programmable logic controller) driving circuit of photovoltaic shutoff device |
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| Publication Number | Publication Date |
|---|---|
| CN212367219U true CN212367219U (en) | 2021-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021083523.4U Active CN212367219U (en) | 2020-06-12 | 2020-06-12 | PLC (programmable logic controller) driving circuit of photovoltaic shutoff device |
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| CN (1) | CN212367219U (en) |
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