CN116027130A - AC lightning protection surge failure detection system and method - Google Patents
AC lightning protection surge failure detection system and method Download PDFInfo
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- CN116027130A CN116027130A CN202211697944.XA CN202211697944A CN116027130A CN 116027130 A CN116027130 A CN 116027130A CN 202211697944 A CN202211697944 A CN 202211697944A CN 116027130 A CN116027130 A CN 116027130A
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Abstract
The invention provides an alternating current lightning protection surge failure detection system and method, which can effectively detect a piezoresistor failure signal, effectively avoid damage to electronic components caused by lightning surge, and prolong the service life of related electronic components; alternating current lightning protection surge failure detection system for in photovoltaic inversion system, it includes: the piezoresistor module is connected with the mains supply end and comprises piezoresistors and fuses which are connected in series, and is used for responding to the current flowing through the fuses from the mains supply end to fuse or conduct a loop; the common mode failure detection module is connected between the mains supply end and the piezoresistor module in a bridging way and is used for detecting and obtaining a common mode failure signal according to the output signal of the piezoresistor module; and the differential mode failure detection module is connected between the mains supply end and the piezoresistor module in a bridging way and is used for detecting and obtaining a differential mode failure signal according to the output signal of the piezoresistor module.
Description
Technical Field
The invention relates to the technical field of lightning surge protection in an inverter, in particular to an alternating current lightning surge failure detection system and method.
Background
Most of the lightning surge protection technology industries in industrial photovoltaic inverters and household photovoltaic energy storage inverters adopt piezoresistors, namely (surge absorbers), the piezoresistors are equivalent to a variable resistor, and when a lightning protection circuit works normally, the impedance of the piezoresistors is large, the leakage current is small, the piezoresistors are equivalent to an open circuit, and the circuit is hardly influenced; however, when a very high surge voltage comes, the resistance value of the piezoresistor drops instantaneously, so that a very large current can flow through the piezoresistor, and the voltage is clamped at a certain value. The piezoresistor is applied to the design of an inverter product port in the industry and is used for absorbing the impact of instantaneous high energy of external environment such as lightning surge and the like, clamping high voltage to a certain range, playing a role in protecting internal circuits and components of the product, namely, connecting the inside of the photovoltaic inverter into similar photovoltaic inverter equipment of a power grid, wherein an AC power grid port inside the photovoltaic inverter equipment is protected by the piezoresistor, but the piezoresistor only can passively absorb surge signals from the outside, and once a very high voltage exceeds a limit value which can be born by the piezoresistor, the piezoresistor is fused, burst and fail; in case of failure of the piezoresistor, the conventional lightning protection circuit cannot detect whether the piezoresistor is intact, and the piezoresistor does not have a feedback signal to inform the lightning protection circuit, so that the piezoresistor cannot play a role of clamping very high voltage, and therefore, when lightning surge occurs again and high voltage enters a product port, a photovoltaic inverter product system still can normally work with the outside, and components connected with the rear of the failed piezoresistor cannot bear the high voltage which is not absorbed by the piezoresistor, so that the voltage stress exceeds the maximum limit, the components are damaged, and even the safety hazards such as fire disaster and the like inside the electronic product are caused.
Disclosure of Invention
In order to solve the problems, the invention provides an alternating current lightning protection surge failure detection system and method, which can effectively detect a piezoresistor failure signal and effectively avoid damage to electronic components caused by lightning surge, thereby prolonging the service life of related electronic components.
The technical scheme is as follows: alternating current lightning protection surge failure detection system for among photovoltaic inversion system, its characterized in that: it comprises the following steps:
the piezoresistor module is connected with the mains supply end and comprises piezoresistors and fuses which are connected in series, and is used for responding to the current flowing through the fuses from the mains supply end to fuse or conduct a loop;
the common mode failure detection module is connected between the mains supply end and the piezoresistor module in a bridging way and is used for detecting and obtaining a common mode failure signal according to the output signal of the piezoresistor module;
and the differential mode failure detection module is connected between the mains supply end and the piezoresistor module in a bridging way and is used for detecting and obtaining a differential mode failure signal according to the output signal of the piezoresistor module.
Further, the system also comprises a control module which is connected with the common mode failure detection module, the differential mode failure detection module and the photovoltaic inverter system, and is used for receiving the common mode failure signal and the differential mode failure signal and outputting a feedback control signal to the photovoltaic inverter system;
the voltage-dependent resistor module is provided with three groups, which are divided into a first voltage-dependent resistor module, a second voltage-dependent resistor module and a third voltage-dependent resistor module, and the first voltage-dependent resistor module, the second voltage-dependent resistor module and the third voltage-dependent resistor module are respectively provided with a voltage-dependent resistor and a fuse which are connected in series;
further, the first piezoresistor module comprises a piezoresistor RV1 and a fuse F1, and is connected between an L line and an N line of the mains supply end in a bridging mode; the second piezoresistor module comprises a piezoresistor RV2 and a fuse F2, and is connected between an L line and a PE line of the mains supply end in a bridging manner; the third piezoresistor module comprises a piezoresistor RV3 and a fuse F3, and is connected between an N line and a PE line of the mains supply end in a bridging manner;
further, the varistor ends of the second varistor module and the third varistor module are connected and then connected to the PE wire through the air discharge tube G1; the MCU is adopted by the control module, and a differential mode failure signal of the differential mode failure detection module and a common mode failure signal end of the common mode failure detection module are both connected with the MCU;
further, the common mode failure detection module comprises resistors R1-R4 and an optocoupler U1, wherein one end of the resistor R1 is connected with one end of the fuse F2, the other end of the resistor R1 is connected with the 2 pin of the optocoupler U1, one end of the resistor R2 is connected with one end of the fuse F3 and one end of the piezoresistor RV2, the other end of the resistor R2 is connected with the 1 pin of the optocoupler U1, the 4 pin of the optocoupler U1 is connected with the power supply 5V after being connected with the resistor R4, the 3 pin of the optocoupler U1 is grounded after being connected with the resistor R3, and a 3 pin connection point of the optocoupler U1 is used as a common mode failure signal end;
further, the differential mode failure detection module comprises resistors R5-R8 and an optocoupler U2, wherein one end of the resistor R5 is connected with one end of the fuse F1, the other end of the resistor R5 is connected with the 2 pin of the optocoupler U2, one end of the resistor R6 is connected with the N line of the mains supply end and one end of the piezoresistor RV1, the other end of the resistor R6 is connected with the 1 pin of the optocoupler U2, the 4 pin of the optocoupler U2 is connected with the power supply 5V after being connected with the resistor R8, the 3 pin of the optocoupler U2 is grounded after being connected with the resistor R7, and the 3 pin connection point of the optocoupler U2 is used as a differential mode failure signal end;
the alternating current lightning protection surge failure detection method is characterized by comprising the following steps of: the method comprises the following steps:
switching on alternating current commercial power, and judging whether a conduction loop is formed between the piezoresistor module and the differential mode failure detection module as well as between the piezoresistor module and the common mode failure detection module respectively;
according to whether the loop is conducted or not, the differential mode failure detection module and the common mode failure detection module respectively output corresponding detection signals; and
and determining whether the piezoresistor in the piezoresistor module fails according to the detection signal.
Further, after the alternating current commercial power is connected, if the current passing through the fuse in the piezoresistor module does not exceed a set threshold, the differential mode failure detection module, the common mode failure detection module and the piezoresistor module can form a conducting loop, and if the current exceeds the set threshold, the fuse is fused to cut off the loop;
further, when the conduction loop exists, the differential mode failure detection module and the common mode failure detection module respectively output high-level detection signals, and then the piezoresistor in the piezoresistor module is determined to be effective; when a conduction loop does not exist, the differential mode failure detection module and the common mode failure detection module both output low-level detection signals, and then the piezoresistor in the piezoresistor module is determined to be invalid;
further, when the control module receives the high-level detection signal, a feedback control signal is output to the photovoltaic inverter system to continue to work; and when the control module receives that any one of the output signals of the differential mode failure detection module and the common mode failure detection module is low level, outputting a feedback control signal to the photovoltaic inverter system to stop working.
The voltage dependent resistor module, the differential mode failure detection module and the common mode failure detection module are connected with each other when the voltage dependent resistor fails and cannot provide lightning stroke surge protection, so that damage to electronic components caused by lightning stroke surge can be effectively avoided, the service life of related electronic components is prolonged, and the voltage dependent resistor module has good economic use value.
Drawings
FIG. 1 is a block diagram of the structure of the present invention;
fig. 2 is a schematic circuit diagram of the present invention.
Detailed Description
As shown in fig. 1 and 2, the ac lightning protection surge failure detection system of the present invention is used in a photovoltaic inverter system, and includes:
the piezoresistor module is connected with the mains supply end and comprises piezoresistors and fuses which are connected in series, and is used for responding to the current flowing through the fuses at the mains supply end to fuse or conduct a loop;
the voltage-dependent resistor module is characterized in that a fuse is arranged between 3 pins and 2 pins of a voltage-dependent resistor module formed by connecting voltage-dependent resistors and fuses in series, and a voltage-dependent resistor is arranged between 2 pins and 1 pin;
the common mode failure detection module is connected between the mains supply end and the piezoresistor module in a bridging way and is used for detecting and obtaining a common mode failure signal according to the output signal of the piezoresistor module;
the differential mode failure detection module is connected between the mains supply end and the piezoresistor module in a bridging way and is used for detecting and obtaining differential mode failure signals according to output signals of the piezoresistor module.
The system also comprises a control module, a common mode failure detection module, a differential mode failure detection module and a photovoltaic inversion system, wherein the control module is connected with the common mode failure detection module, the differential mode failure detection module and the photovoltaic inversion system and is used for receiving a common mode failure signal and a differential mode failure signal and outputting a feedback control signal to the photovoltaic inversion system;
the piezoresistor modules are provided with three groups, and are divided into a first piezoresistor module, a second piezoresistor module and a third piezoresistor module, and piezoresistors and fuses which are connected in series are arranged in the first piezoresistor module, the second piezoresistor module and the third piezoresistor module.
The first piezoresistor module comprises a piezoresistor RV1 and a fuse F1, the first piezoresistor module is connected between an L line (live line) and an N line (zero line) of the mains supply end in a bridging mode, and the piezoresistor RV1 connected between the L line and the N line plays a role in differential mode surge absorption protection; the second piezoresistor module comprises a piezoresistor RV2 and a fuse F2, the second piezoresistor module is bridged between an L line and a PE line (protection ground wire) at the mains supply end, and the piezoresistor RV2 bridged between the L line and the PE line plays a role in common-mode surge absorption protection of a live wire; the third piezoresistor module comprises a piezoresistor RV3 and a fuse F3, is connected between an N line and a PE line of the mains supply end in a bridging mode, and the piezoresistor RV3 connected between the N line and the PE line plays a role in zero line common mode surge absorption protection;
the 3 pin of the first piezoresistor module is connected with the L line of the mains supply end, the 1 pin of the first piezoresistor module is connected with the N line of the mains supply end and one end of a resistor R6, and the 2 pin of the first piezoresistor module is connected with one end of a resistor R5;
the N line of commercial power end is all connected to 3 feet of second piezoresistor module and third piezoresistor module, and the 1 foot of second piezoresistor module and third piezoresistor module is connected with one end of air discharge tube G1 after all linking, and 2 feet of second piezoresistor module are connected with one end of resistance R1, and 2 feet of third piezoresistor module are connected with 1 foot of second piezoresistor module, one end of resistance R2.
The piezoresistor ends of the second piezoresistor module and the third piezoresistor module are connected and then connected with a PE wire through an air discharge tube G1; the MCU is adopted by the control module, and a differential mode failure signal of the differential mode failure detection module and a common mode failure signal end of the common mode failure detection module are both connected with the MCU.
The common mode failure detection module comprises resistors R1-R4 and an optocoupler U1, one end of the resistor R1 is connected with one end of a fuse F2, the other end of the resistor R1 is connected with the 2 pin of the optocoupler U1, one end of the resistor R2 is connected with one end of a fuse F3 and one end of a piezoresistor RV2, the other end of the resistor R2 is connected with the 1 pin of the optocoupler U1, the 4 pin of the optocoupler U1 is connected with a power supply 5V after passing through the connecting resistor R4, the 3 pin of the optocoupler U1 is grounded after passing through the connecting resistor R3, and a 3 pin connecting point of the optocoupler U1 is used as a common mode failure signal end.
The differential mode failure detection module comprises resistors R5-R8 and an optocoupler U2, one end of the resistor R5 is connected with one end of a fuse F1, the other end of the resistor R5 is connected with the 2 pin of the optocoupler U2, one end of the resistor R6 is connected with an N line of a mains supply end and one end of a piezoresistor RV1, the other end of the resistor R6 is connected with the 1 pin of the optocoupler U2, the 4 pin of the optocoupler U2 is connected with a power supply 5V after passing through the connecting resistor R8, the 3 pin of the optocoupler U2 is grounded after passing through the connecting resistor R7, and a 3 pin connecting point of the optocoupler U2 is used as a differential mode failure signal end.
The optocoupler U1 and the optocoupler U2 are two ac input optocouplers, for example, when there is ac input between the 1 pin and the 2 pin of the optocoupler U1, the 3 pin and the 4 pin of the secondary side of the optocoupler U1 are turned from a high-resistance state to a conductive state, and the impedance between the two pins is changed to 0. The air discharge tube G1 operates on the principle that an air gap discharges, and when a certain voltage is applied between the electrodes of the discharge tube, an uneven electric field is generated between the electrodes. Under the action of the electric field, the gas in the tube starts to be dissociated, when the external voltage is increased to enable the field intensity between electrodes to exceed the insulating intensity of the gas, the gap between the two electrodes breaks down the discharge, the original insulating state is converted into the conductive state, the voltage between the two electrodes of the discharge tube is maintained at the residual voltage level determined by the discharge arc channel after the conduction, the residual voltage is generally very low, thus the electronic equipment connected with the discharge tube in parallel is prevented from being damaged by overvoltage, the electronic equipment is matched with the piezoresistor in series, and when the voltage born by the piezoresistor is overlarge, the energy can be released through the air discharge tube, so that the clamping capability of the piezoresistor is improved.
The alternating current lightning protection surge failure detection method comprises the following steps:
switching on alternating current commercial power, and judging whether a conduction loop is formed between the piezoresistor module and the differential mode failure detection module as well as between the piezoresistor module and the common mode failure detection module respectively;
specifically, after the alternating current commercial power is connected, if the current passing through the fuse in the piezoresistor module does not exceed a set threshold, the differential mode failure detection module, the common mode failure detection module and the piezoresistor module can form a conducting loop, and if the current exceeds the set threshold, the fuse is fused to cut off the loop;
according to whether the loop is conducted or not, the differential mode failure detection module and the common mode failure detection module respectively output corresponding detection signals; and
determining whether a piezoresistor in the piezoresistor module fails according to the detection signal;
specifically, when the conduction loop exists, the differential mode failure detection module and the common mode failure detection module respectively output high-level detection signals, and then the piezoresistor in the piezoresistor module is determined to be effective; when the conduction loop does not exist, the differential mode failure detection module and the common mode failure detection module both output low-level detection signals, and then the piezoresistor in the piezoresistor module is determined to be invalid.
When the control module receives the high-level detection signal, a feedback control signal is output to the photovoltaic inverter system to continue to work; when the control module receives that any one of the output signals of the differential mode failure detection module and the common mode failure detection module is in a low level, a feedback control signal is output to the photovoltaic inverter system to stop working.
When the voltage dependent resistor is damaged and cannot provide a lightning surge protection effect, a signal for confirming that the lightning surge protection is invalid is provided for a photovoltaic inverter system, a failure detection system can perform active warning or has the action of disconnecting protection equipment such as a connection state with alternating current mains supply, and the like, a differential mode surge and a common mode surge exist at an alternating current mains supply interface end, the differential mode protection refers to the surge protection between L-N, and the common mode protection refers to the surge protection between L-PE and N-PE, and the voltage dependent resistor RV1, RV2 and RV3 are respectively connected across L-N, L-PE and N-PE; the detection of the failure signal is carried out by using only two alternating current conduction loops, wherein the common mode signal detection loop simultaneously detects the piezoresistor modules connected across the L-PE and the N-PE, and only one signal is used for simultaneously detecting the two piezoresistor modules, so that used components are saved, and meanwhile, the acquisition modes are all differential mode current loops, so that the signals are more reliable; the characteristic of optical coupling isolation of the detection signal meets the characteristic of directivity of surge impact.
Specifically, the working principle of the invention is that when the detection system works normally, a differential mode detection signal loop and a common mode detection signal loop exist;
the working principle of the differential mode detection signal loop is as follows: when the voltage regulator works normally, alternating current flows out from the 2 pins of the first piezoresistor module after passing through the fuse F1 from the L line, flows into the alternating current optocoupler U2 through the current limiting resistor R5, and returns to the N line from the 1 pin of the optocoupler U2 through the current limiting resistor R6, so that an alternating current conduction loop is formed, the 3 pins and the 4 pins of the output end of the optocoupler U2 are conducted, the resistor R8 and the resistor R7 are conducted in series, and after the voltage of the power supply +5V is divided by the resistors R7 and R8, a differential mode failure signal (namely a DM_AC_ALARM signal) end outputs a high level signal;
when the voltage dependent resistor RV1 works abnormally, namely, the voltage dependent resistor RV1 fails, a fuse F1 is fused, so that a loop in normal working is disconnected, the input voltage of the alternating current optical coupler U2 is 0, the output end 3 pin and the output end 4 pin of the optical coupler U2 are not conducted, and the DM_AC_ALARM signal end has no voltage and is output to be in a low level;
the working principle of the common mode detection signal loop is as follows: when the AC voltage regulator works normally, the AC power flows out from the pin 2 of the second piezoresistor module after passing through the fuse F2 by the L line, flows into the AC optocoupler U1 through the current limiting resistor R1, flows out from the pin 1 of the optocoupler U1 into the third piezoresistor module through the current limiting resistor R2, and returns to the N line by the fuse F3 in the third piezoresistor module, so that an AC conduction loop is formed, the pin 3 and the pin 4 of the output end of the optocoupler U1 are conducted, the resistors R3 and R4 are conducted in series, and a common mode failure signal (namely CM_AC_ALARM signal) end outputs a high level signal after the power +5V is divided by the resistors R3 and R4;
when the voltage dependent resistor RV2 or RV3 fails during abnormal operation, the corresponding fuse is fused, so that a loop is disconnected during normal operation, the input voltage of the alternating current optical coupler U1 is 0, the output end 3 pin and the output end 4 pin of the optical coupler U1 are not conducted, the CM_AC_ALARM signal end has no voltage, and the output is in a low level;
in summary, by the above sampling method, the output dm_ac_alarm signal and cm_ac_alarm signal are sent to the I/O port of the MCU, when the dm_ac_alarm signal is detected to be at a high level, it indicates that the varistor RV1 is not deactivated, and when the dm_ac_alarm signal is detected to be at a low level, it indicates that the varistor RV1 is deactivated; when the CM_AC_ALARM signal is detected to be at a high level, the voltage dependent resistor RV2 or RV3 is not disabled, and when the CM_AC_ALARM signal is detected to be at a low level, the voltage dependent resistor RV2 or RV3 is disabled; and when any one of the two I/O ports detected by the MCU is at a low level, outputting a feedback control signal to the photovoltaic inverter system to stop working, so that the electronic components can be protected.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (10)
1. Alternating current lightning protection surge failure detection system for among photovoltaic inversion system, its characterized in that: it comprises the following steps:
the piezoresistor module is connected with the mains supply end and comprises piezoresistors and fuses which are connected in series, and is used for responding to the current flowing through the fuses from the mains supply end to fuse or conduct a loop;
the common mode failure detection module is connected between the mains supply end and the piezoresistor module in a bridging way and is used for detecting and obtaining a common mode failure signal according to the output signal of the piezoresistor module;
and the differential mode failure detection module is connected between the mains supply end and the piezoresistor module in a bridging way and is used for detecting and obtaining a differential mode failure signal according to the output signal of the piezoresistor module.
2. The ac lightning protection surge failure detection system of claim 1, wherein: the control module is connected with the common mode failure detection module, the differential mode failure detection module and the photovoltaic inverter system, and is used for receiving a common mode failure signal and a differential mode failure signal and outputting a feedback control signal to the photovoltaic inverter system;
the voltage dependent resistor module is provided with three groups, which are divided into a first voltage dependent resistor module, a second voltage dependent resistor module and a third voltage dependent resistor module, and the first voltage dependent resistor module, the second voltage dependent resistor module and the third voltage dependent resistor module are respectively provided with a voltage dependent resistor and a fuse which are connected in series.
3. The ac lightning protection surge failure detection system of claim 2, wherein: the first piezoresistor module comprises a piezoresistor RV1 and a fuse F1, and is connected between an L line and an N line of the mains supply end in a bridging manner; the second piezoresistor module comprises a piezoresistor RV2 and a fuse F2, and is connected between an L line and a PE line of the mains supply end in a bridging manner; the third piezoresistor module comprises a piezoresistor RV3 and a fuse F3, and is connected between the N line and the PE line of the mains supply end in a bridging mode.
4. The ac lightning protection surge failure detection system of claim 2, wherein: the piezoresistor ends of the second piezoresistor module and the third piezoresistor module are connected and then connected with a PE wire through an air discharge tube G1; and the MCU is adopted by the control module, and a differential mode failure signal of the differential mode failure detection module and a common mode failure signal end of the common mode failure detection module are both connected with the MCU.
5. The ac lightning protection surge failure detection system of claim 3, wherein: the common mode failure detection module comprises resistors R1-R4 and an optocoupler U1, one end of the resistor R1 is connected with one end of a fuse F2, the other end of the resistor R1 is connected with 2 pins of the optocoupler U1, one end of the resistor R2 is connected with one end of a fuse F3 and one end of a piezoresistor RV2 in a homogeneous phase mode, the other end of the resistor R2 is connected with 1 pin of the optocoupler U1, 4 pins of the optocoupler U1 are connected with a power supply 5V after being connected with the resistor R4, 3 pins of the optocoupler U1 are connected with the resistor R3 and then grounded, and 3 pin connection points of the optocoupler U1 are used as common mode failure signal ends.
6. The ac lightning protection surge failure detection system of claim 3, wherein: the differential mode failure detection module comprises resistors R5-R8 and an optocoupler U2, one end of the resistor R5 is connected with one end of a fuse F1, the other end of the resistor R5 is connected with 2 pins of the optocoupler U2, one end of the resistor R6 is connected with an N line of a mains supply end and one end of a piezoresistor RV1, the other end of the resistor R6 is connected with 1 pin of the optocoupler U2, 4 pins of the optocoupler U2 are connected with a power supply 5V after being connected with the resistor R8, 3 pins of the optocoupler U2 are connected with the resistor R7 and then grounded, and a 3 pin connection point of the optocoupler U2 is used as a differential mode failure signal end.
7. The alternating current lightning protection surge failure detection method is characterized by comprising the following steps of: comprising an ac lightning protection surge failure detection system according to any of claims 1-6, the method comprising the steps of:
switching on alternating current commercial power, and judging whether a conduction loop is formed between the piezoresistor module and the differential mode failure detection module as well as between the piezoresistor module and the common mode failure detection module respectively;
according to whether the loop is conducted or not, the differential mode failure detection module and the common mode failure detection module respectively output corresponding detection signals; and
and determining whether the piezoresistor in the piezoresistor module fails according to the detection signal.
8. The ac lightning protection surge failure detection method of claim 7, wherein: after the alternating current commercial power is connected, if the current passing through the fuse in the piezoresistor module does not exceed a set threshold, the differential mode failure detection module, the common mode failure detection module and the piezoresistor module can form a conducting loop, and if the current exceeds the set threshold, the fuse is fused to cut off the loop.
9. The ac lightning protection surge failure detection method of claim 7, wherein: when the conduction loop exists, the differential mode failure detection module and the common mode failure detection module respectively output high-level detection signals, and then the piezoresistor in the piezoresistor module is determined to be effective; and when the conduction loop does not exist, the differential mode failure detection module and the common mode failure detection module output low-level detection signals, and then the piezoresistor in the piezoresistor module is determined to be invalid.
10. The ac lightning protection surge failure detection method of claim 7, wherein: when the control module receives the high-level detection signal, a feedback control signal is output to the photovoltaic inverter system to continue to work; and when the control module receives that any one of the output signals of the differential mode failure detection module and the common mode failure detection module is low level, outputting a feedback control signal to the photovoltaic inverter system to stop working.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117929902A (en) * | 2024-03-14 | 2024-04-26 | 浙江泰科天唯电气有限公司 | Composite surge protector detection method, surge protector and storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117929902A (en) * | 2024-03-14 | 2024-04-26 | 浙江泰科天唯电气有限公司 | Composite surge protector detection method, surge protector and storage medium |
| CN117929902B (en) * | 2024-03-14 | 2024-05-24 | 浙江泰科天唯电气有限公司 | Composite surge protector detection method, surge protector and storage medium |
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Address after: No. 18, Ruipu Road, Suzhou Industrial Park, Suzhou Area, China (Jiangsu) Pilot Free Trade Zone, Suzhou, Jiangsu 215123 Applicant after: Jiangsu Ascite Energy Technology Co.,Ltd. Address before: No. 18, Ruipu Road, Suzhou Industrial Park, Suzhou Area, China (Jiangsu) Pilot Free Trade Zone, Suzhou, Jiangsu 215123 Applicant before: JIANGSU ASHITE ENERGY TECHNOLOGY Co.,Ltd. |
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