CN217935075U - FSK signal control circuit for realizing on-off control of photovoltaic turn-off device - Google Patents
FSK signal control circuit for realizing on-off control of photovoltaic turn-off device Download PDFInfo
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- CN217935075U CN217935075U CN202222112936.6U CN202222112936U CN217935075U CN 217935075 U CN217935075 U CN 217935075U CN 202222112936 U CN202222112936 U CN 202222112936U CN 217935075 U CN217935075 U CN 217935075U
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Abstract
The utility model provides an FSK signal control circuit for realizing the on-off control of a photovoltaic shutoff device, which comprises a photovoltaic shutoff device consisting of an inductor L0, capacitors C40-C45 and capacitors C50-C55, and a matching impedance meeting the SunSpec standard requirement; the LC series-parallel resonance frequency selection circuit is composed of a capacitor C11, a capacitor C14, an inductor L5, an inductor L6 and a resistor R12, meets the sensitivity and anti-interference performance required by the SunSpec standard, and comprises a series harmonic oscillator circuit and a parallel harmonic oscillator circuit which are connected in series; the series harmonic oscillator circuit is formed by connecting a capacitor C11 and an inductor L5 in series, and the resonance frequency of the series harmonic oscillator circuit meets the preset interval set by 2 FSK signal frequencies; the parallel resonant sub-circuit is formed by connecting a capacitor C14, an inductor L6 and a resistor R12 in parallel, and the resonant frequency of the parallel resonant sub-circuit is close to a preset interval set by 2 FSK signal frequencies; and a MOS transistor Q1. Implement the utility model discloses, can be on the basis of guaranteeing FSK signal strength and interference immunity, reduce cost.
Description
Technical Field
The utility model relates to a photovoltaic technology field especially relates to a realize that photovoltaic shutoff opens and shuts off FSK signal control circuit of control.
Background
With the rise of new energy industry, photovoltaic panels are increasingly used. At present, a product for ensuring the use safety of a photovoltaic panel is a shutoff device, which can monitor the voltage of the photovoltaic panel, the signal voltage and the ambient temperature, and can rapidly cut off the power supply of the photovoltaic panel under abnormal conditions, so that the output voltage of the photovoltaic panel is reduced to be below a safe voltage value within a set time, and the use safety and the personal safety are ensured.
At present, the photovoltaic shutoff device is mainly controlled by an FSK signal of a SunSpec standard. Compared with an external 24V power supply, the FSK signal control mode controls the photovoltaic shutoff device, two 24V cables are saved, the cable cost of the photovoltaic shutoff device is greatly reduced, and the control mode is simpler and more convenient.
However, for impedance matching and FSK signal strength required by SunSpec certification, the existing photovoltaic shutoff device often adopts a large-volume large inductor and dozens of capacitors to form an FSK signal control circuit, but the FSK signal control circuit not only has poor FSK signal strength and anti-interference performance, but also has high cost due to the fact that the number of capacitors is too large (dozens of capacitors).
Therefore, in order to solve the above problems, a new FSK signal control circuit of a photovoltaic breaker is needed to reduce the cost while ensuring the FSK signal strength and the anti-interference performance.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a technical problem that will solve lies in, provides a realize that photovoltaic shutoff device opens and shuts off FSK signal control circuit of control, can be on the basis of guaranteeing FSK signal strength and interference immunity, reduce cost.
In order to solve the technical problem, the embodiment of the utility model provides a realize that photovoltaic shutoff device opens and shuts off FSK signal control circuit of control, include:
the photovoltaic shutoff device consisting of the inductor L0, the capacitors C40-C45 and the capacitors C50-C55 meets the matched impedance required by the SunSpec standard; one end of the inductor L0 is connected with the positive electrode PV + of the power supply, and the other end of the inductor L0 forms a matching impedance end OUT + of the photovoltaic shutoff device; the capacitors C50-C55 are connected in parallel, and one end of the connected capacitors C50-C55 is connected with the inductor L0 and the positive electrode PV + of the power supply, and the other end is connected with the negative electrode PV-; every two of the capacitors C40-C45 are connected in parallel, one end of the connected capacitor C40-C45 is connected with a power supply cathode PV-and one end of the connected capacitor C50-C55, and the other end of the connected capacitor C40-C45 is formed into another matching impedance end OUT-of the photovoltaic shutoff device;
the LC series-parallel resonance frequency selection circuit which is composed of a capacitor C11, a capacitor C14, an inductor L5, an inductor L6 and a resistor R12 and meets the SunSpec standard requirement on sensitivity and anti-interference performance; one end of the LC series-parallel resonance frequency-selecting circuit is connected with a matching impedance end OUT + of the photovoltaic shutoff formed on the inductor L0, and the other end of the LC series-parallel resonance frequency-selecting circuit is connected with one end of a power source cathode PV-, the parallelly-connected capacitors C50-C55 and one end of the parallelly-connected capacitors C40-C45; the LC series-parallel resonance frequency selection circuit comprises a series harmonic oscillator circuit and a parallel harmonic oscillator circuit which are connected in series; the series harmonic oscillator circuit is formed by connecting a capacitor C11 and an inductor L5 in series, and the resonance frequency of the series harmonic oscillator circuit is close to a preset interval set by 2 FSK signal frequencies; the parallel harmonic oscillator circuit is formed by connecting a capacitor C14, an inductor L6 and a resistor R12 in parallel, and the resonance frequency of the parallel harmonic oscillator circuit is close to a preset interval set by 2 FSK signal frequencies; and a MOS transistor Q1; the grid electrode of the MOS tube is connected with a control circuit for controlling the MOS tube after the chip analyzes the FSK signal, the source electrode is connected with the negative electrode PV of the power supply, and the drain electrode is connected with the other matched impedance end OUT-of the photovoltaic shutoff formed on the capacitors C50-C55.
The inductance value of the inductor L0 is 4uH.
The resonant frequency of the series harmonic oscillator circuit is f1=129.115KHZ; the resonance frequency of the parallel resonance sub-circuit is f2=118.556KHZ.
The capacitors C40-C45 and the capacitors C50-C55 are all capacitors of the same specification type, and the specification is 1uF/250V/1812.
Wherein, the capacitor C11 is a COG capacitor, and the capacitance value thereof is 3.9nF; the capacitance value of the capacitor C14 is 82nF.
The MOS tube Q1 is of a type CRSS043.
The inductance value of the inductor L6 is 22uH.
Implement the embodiment of the utility model provides a, following beneficial effect has:
the photovoltaic shutoff device of the utility model comprises an inductor L0, capacitors C40-C45 and capacitors C50-C55, and the matching impedance meets the SunSpec standard requirement, thereby reducing the cost; meanwhile, an LC series-parallel resonance frequency selection circuit which meets the sensitivity and anti-interference performance required by the SunSpec standard is composed of a capacitor C11, a capacitor C14, an inductor L5, an inductor L6 and a resistor R12, interference signals can be effectively filtered out through the LC series-parallel resonance frequency selection circuit (the anti-interference test of the interference signals with 10 times of the FSK signal intensity of the SunSpec standard is carried out), the resonance frequency is enabled to be close to the FSK signal frequency as much as possible, and the sensitivity required by the SunSpec standard is met on the basis of ensuring the intensity of the final FSK signal.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings obtained from these drawings still belong to the scope of the present invention without inventive laboriousness.
Fig. 1 is a schematic circuit diagram of an FSK signal control circuit for implementing on and off control of a photovoltaic breaker according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, for the embodiment of the present invention provides an FSK signal control circuit for controlling the switching on and off of a photovoltaic shutoff device, including:
the photovoltaic shutoff device consisting of the inductor L0, the capacitors C40-C45 and the capacitors C50-C55 meets the matched impedance required by the SunSpec standard; one end of the inductor L0 is connected with the positive electrode PV + of the power supply, and the other end of the inductor L0 forms a matching impedance end OUT + of the photovoltaic shutoff device; every two capacitors C50-C55 are connected in parallel, one end of each capacitor C50-C55 after being connected in parallel is connected with the inductor L0 and the positive electrode PV + of the power supply, and the other end is connected with the negative electrode PV-; every two of the capacitors C40-C45 are connected in parallel, one end of the connected capacitor C40-C45 is connected with a power supply cathode PV-and one end of the connected capacitor C50-C55, and the other end of the connected capacitor C40-C45 is formed into another matching impedance end OUT-of the photovoltaic shutoff device; wherein, the inductor L0 is a small inductor with an inductance value of 4uH; the capacitors C40-C45 and the capacitors C50-C55 are capacitors of the same specification type, the specification of the capacitors is 1uF/250V/1812, 6 capacitors such as the capacitors C40-C45 and the capacitors C50-C55 have enough capacity to reduce impedance and keep the impedance of two ends of OUT + and OUT-before and after the MOS tube is switched on consistent;
the LC series-parallel resonance frequency selection circuit comprises a capacitor C11, a capacitor C14, an inductor L5, an inductor L6 and a resistor R12, and meets the sensitivity and anti-interference requirements of SunSpec standards; one end of the LC series-parallel resonance frequency-selecting circuit is connected with a matching impedance end OUT + of the photovoltaic shutoff formed on the inductor L0, and the other end of the LC series-parallel resonance frequency-selecting circuit is connected with one end of a power source cathode PV-, the parallelly-connected capacitors C50-C55 and one end of the parallelly-connected capacitors C40-C45; the LC series-parallel resonance frequency selection circuit comprises a series harmonic oscillator circuit and a parallel harmonic oscillator circuit which are connected in series; the series resonant sub circuit is formed by connecting a capacitor C11 and an inductor L5 in series, the resonant frequency of the resonant sub circuit is f1=129.115KHZ and is close to a preset interval set by 2 FSK signal frequencies; the parallel harmonic oscillator circuit is formed by connecting a capacitor C14, an inductor L6 and a resistor R12 in parallel, wherein the resonance frequency of the resonance frequency is f2=118.556KHZ and is close to a preset interval set by 2 FSK signal frequencies; wherein, the capacitor C11 is a COG capacitor, and the capacitance value thereof is 3.9nF; the capacitance value of the capacitor C14 is 82nF; inductance L5 is 391 (5030); the inductance value of the inductor L6 is 22uH; the resistance value of the resistor R12 is 39R; and
an MOS tube Q1; the grid electrode of the MOS tube is connected with a control circuit for controlling the MOS tube after the chip analyzes the FSK signal, the source electrode is connected with the negative electrode PV-of the power supply, and the drain electrode is connected with the other matched impedance end OUT-of the photovoltaic shutoff device formed on the capacitors C50-C55; the MOS tube Q1 is of a type CRSS043.
The embodiment of the utility model provides an in realize that photovoltaic shutoff opens and shuts off FSK signal control circuit's of control theory of operation does, only need an inductance L0 of 4uH after impedance match calculates, 12 electric capacities such as electric capacity C40 ~ C45 and electric capacity C50 ~ C55 can reach the photovoltaic shutoff both ends impedance that SunSpec standard required, wherein, 6 electric capacities such as electric capacity C40 ~ C45 have sufficient capacity to reduce impedance, make MOS pipe Q1 open preceding back shutoff both ends impedance keep unanimous.
In order to ensure the intensity of an FSK signal and meet the sensitivity and anti-interference performance required by the SunSpec standard, an LC series-parallel resonance frequency selection circuit is formed by a capacitor C11, a capacitor C14, an inductor L5, an inductor L6 and a resistor R12, and the circuit impedance reaches the minimum value when the circuit generates series resonance. Wherein, constitute series resonance sub-circuit by electric capacity C11 and inductance L5 series connection, this sub-circuit's resonant frequency f1=129.115KHZ, two frequencies that are very close to the FSK signal, so the signal of these two frequencies can pass through more easily, the signal of other frequencies can receive the decay according to the skew degree with resonant frequency, at this moment, electric capacity C11 chooses the COG electric capacity for use, can reduce the influence of high-low voltage to electric capacity and guarantee that the impedance of circuit is unchangeable when high-low voltage, very big improvement the interference killing feature of shutoff device. When the circuit generates parallel resonance, the circuit is equivalent to an open circuit, and the impedance is maximum. The capacitor C14, the inductor L6 and the resistor R12 are connected in parallel to form a parallel resonant sub-circuit, the resonant frequency f2=118.556KHZ of the sub-circuit is relatively close to two frequencies of the FSK signal, so that the FSK signal can be concentrated at two ends of the resistor R12 and then sent to a chip for analysis, and other frequency shift resonant frequencies are relatively large and can be easily filtered through the parallel circuit flowing into the ground.
Therefore, the LC series-parallel resonance frequency selection circuit can effectively filter out interference signals (through the anti-interference test of the interference signals with 10 times of FSK signal strength of the SunSpec standard), and enables the resonance frequency to be close to the FSK signal frequency as much as possible, so that the strength of the final FSK signal is ensured, and the sensitivity required by the SunSpec standard is met. The final signal strength.
In addition, the ground wire is widened by adjusting the layout of the components on the distribution board, the division of the ground wire is avoided, the impedance and the interference are reduced, signals can better flow from one photovoltaic breaker to the next photovoltaic breaker, and the signal intensity of the whole photovoltaic system is improved.
Implement the embodiment of the utility model provides a, following beneficial effect has:
the photovoltaic shutoff device of the utility model comprises an inductor L0, capacitors C40-C45 and capacitors C50-C55, and the matching impedance meets the SunSpec standard requirement, thereby reducing the cost; meanwhile, an LC series-parallel resonance frequency selection circuit which meets the sensitivity and anti-interference performance required by the SunSpec standard is composed of a capacitor C11, a capacitor C14, an inductor L5, an inductor L6 and a resistor R12, interference signals can be effectively filtered out through the LC series-parallel resonance frequency selection circuit (the anti-interference test of the interference signals with 10 times of the FSK signal intensity of the SunSpec standard is carried out), the resonance frequency is enabled to be close to the FSK signal frequency as much as possible, and the sensitivity required by the SunSpec standard is met on the basis of ensuring the intensity of the final FSK signal.
The above disclosure is only a preferred embodiment of the present invention, and certainly should not be taken as limiting the scope of the invention, which is defined by the claims and their equivalents.
Claims (7)
1. An FSK signal control circuit for realizing on-off control of a photovoltaic shutoff device is used on the photovoltaic shutoff device and is characterized by comprising:
the photovoltaic shutoff device consisting of the inductor L0, the capacitors C40-C45 and the capacitors C50-C55 meets the matched impedance required by the SunSpec standard; one end of the inductor L0 is connected with the positive electrode PV + of the power supply, and the other end of the inductor L0 forms a matching impedance end OUT + of the photovoltaic shutoff device; the capacitors C50-C55 are connected in parallel, and one end of the connected capacitors C50-C55 is connected with the inductor L0 and the positive electrode PV + of the power supply, and the other end is connected with the negative electrode PV-; every two of the capacitors C40-C45 are connected in parallel, one end of the connected capacitor C40-C45 is connected with a power supply cathode PV-and one end of the connected capacitor C50-C55, and the other end of the connected capacitor C40-C45 is formed into another matching impedance end OUT-of the photovoltaic shutoff device;
the LC series-parallel resonance frequency selection circuit which is composed of a capacitor C11, a capacitor C14, an inductor L5, an inductor L6 and a resistor R12 and meets the SunSpec standard requirement on sensitivity and anti-interference performance; one end of the LC series-parallel resonance frequency-selecting circuit is connected with a matching impedance end OUT + of the photovoltaic shutoff formed on the inductor L0, and the other end of the LC series-parallel resonance frequency-selecting circuit is connected with one end of a power source cathode PV-, the parallelly-connected capacitors C50-C55 and one end of the parallelly-connected capacitors C40-C45; the LC series-parallel resonance frequency selection circuit comprises a series harmonic oscillator circuit and a parallel harmonic oscillator circuit which are connected in series; the series harmonic oscillator circuit is formed by connecting a capacitor C11 and an inductor L5 in series, and the resonance frequency of the series harmonic oscillator circuit is close to a preset interval set by 2 FSK signal frequencies; the parallel harmonic oscillator circuit is formed by connecting a capacitor C14, an inductor L6 and a resistor R12 in parallel, and the resonance frequency of the parallel harmonic oscillator circuit is close to a preset interval set by 2 FSK signal frequencies; and
an MOS tube Q1; the grid electrode of the MOS tube is connected with a control circuit for controlling the MOS tube after the chip analyzes the FSK signal, the source electrode is connected with the negative electrode PV-of the power supply, and the drain electrode is connected with the other matched impedance end OUT-of the photovoltaic breaker formed on the capacitors C50-C55.
2. The FSK signal control circuit for enabling switching on and off of a photovoltaic shutdown device of claim 1, wherein the inductance of the inductor L0 is 4uH.
3. The FSK signal control circuit for implementing on and off control of a photovoltaic shutdown device as claimed in claim 2, wherein the resonant frequency of the series resonator sub-circuit is f1=129.115KHZ; the resonant frequency of the parallel resonant sub-circuit is f2=118.556KHZ.
4. The FSK signal control circuit for realizing the on-off control of the photovoltaic shutoff device according to claim 3, wherein the capacitors C40-C45 and the capacitors C50-C55 are capacitors of the same specification type and have the specification of 1uF/250V/1812.
5. The FSK signal control circuit for enabling turn-on and turn-off control of a photovoltaic shutdown device of claim 4, wherein the capacitor C11 is a COG capacitor having a capacitance of 3.9nF; the capacitance value of the capacitor C14 is 82nF.
6. The FSK signal control circuit for realizing the on-off control of the photovoltaic shutoff device according to claim 5, wherein the MOS transistor Q1 is of a type of CRSS043.
7. The FSK signal control circuit for controlling the on and off of a photovoltaic shutoff device according to claim 6, wherein an inductance value of the inductor L6 is 22uH.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222112936.6U CN217935075U (en) | 2022-08-11 | 2022-08-11 | FSK signal control circuit for realizing on-off control of photovoltaic turn-off device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222112936.6U CN217935075U (en) | 2022-08-11 | 2022-08-11 | FSK signal control circuit for realizing on-off control of photovoltaic turn-off device |
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| CN217935075U true CN217935075U (en) | 2022-11-29 |
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| CN202222112936.6U Active CN217935075U (en) | 2022-08-11 | 2022-08-11 | FSK signal control circuit for realizing on-off control of photovoltaic turn-off device |
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Address after: 325000 Wenzhou Bridge Industrial Park, Beibeixiang Town, Yueqing City, Wenzhou City, Zhejiang Province Patentee after: Zhejiang Benyi New Energy Co.,Ltd. Address before: 325600 Daqiao Industrial Zone, beibaixiang Town, Yueqing City, Wenzhou City, Zhejiang Province Patentee before: ZHEJIANG BENYI ELECTRICAL Co.,Ltd. |