CN215375643U - Arc detection sensor and arc detection circuit - Google Patents
Arc detection sensor and arc detection circuit Download PDFInfo
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- CN215375643U CN215375643U CN202120679350.0U CN202120679350U CN215375643U CN 215375643 U CN215375643 U CN 215375643U CN 202120679350 U CN202120679350 U CN 202120679350U CN 215375643 U CN215375643 U CN 215375643U
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Abstract
The utility model provides an arc detection sensor and an arc detection circuit, wherein a direct current sensor and an arc-drawing mutual inductor are arranged in a packaging shell of the arc detection sensor; a cable through which a current to be detected flows simultaneously penetrates through a magnetic core of the direct current sensor and a magnetic core of the arc transformer, an output end of the direct current sensor outputs a current measurement signal, and an output end of the arc transformer outputs a high-frequency current detection signal; namely, the two work independently of each other, avoided among the prior art the influence of hall current sensor's error to the electric arc testing result, still avoided the problem that alternating current-direct current sampling is synchronous to be invalid when hall current sensor became invalid simultaneously, improved electric arc testing's reliability for prior art. In addition, the integrated arrangement can also reduce the occupied area and the system cost. In addition, the mutual inductor is adopted to sample the alternating current signal, and the sampling precision of arc detection is further improved.
Description
Technical Field
The utility model relates to the technical field of power electronics, in particular to an arc detection sensor and an arc detection circuit.
Background
With the development of photovoltaic power generation, the direct-current voltage of a photovoltaic power generation system is higher and higher, such as 1500V of photovoltaic string voltage; if a certain connecting point among numerous connecting points of the system is not connected well, the arc discharge phenomenon can occur, and due to the fact that direct current does not have a zero crossing point, the arc is not easy to extinguish once burning, and serious harm can be caused. Therefore, arc detection is essential for photovoltaic power generation systems.
At present, the detection idea of the direct current arc is as follows: determining whether an arc occurs based on the frequency domain and time domain variation of the alternating current on the direct current cable; that is, the ac current on the dc cable needs to be collected. When the current inverter realizes direct current arc detection, in order to save cost, a Hall current sensor collects direct current and collects alternating current at the same time; and then the current measurement and the arc detection of the photovoltaic string are simultaneously realized by utilizing a subsequent circuit.
In practical application, because the direct current in the photovoltaic power generation system can reach more than 20A, a little error exists in current measurement and is acceptable; however, since the ac current generated when the dc arc is drawn is small, generally in the mA level, the error of the hall current sensor affects the result of the arc detection. Moreover, once the hall current sensor is damaged, both the dc current detection and the ac current detection of the hall current sensor fail, and the arc detection function also fails.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides an arc detection sensor and an arc detection circuit to improve the reliability of arc detection.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
a first aspect of the present invention provides an arc detection sensor comprising: the direct current transformer and the arc transformer are arranged in the packaging shell; wherein:
a cable through which current to be detected flows simultaneously penetrates through a magnetic core of the direct current sensor and a magnetic core of the arc-pulling mutual inductor;
the output end of the direct current sensor outputs a current measurement signal;
and the output end of the arc transformer outputs a high-frequency current detection signal.
Preferably, the dc current sensor and the arcing transformer share the same magnetic core.
Preferably, the direct current sensor is a hall current sensor.
Preferably, the arc transformer is a high-frequency alternating current transformer.
The second aspect of the present invention also provides an arc detection circuit, including: a signal conversion circuit, a band pass filter, a microprocessor and an arc detection sensor as described in any of the preceding paragraphs of the first aspect; wherein:
the output end of an arc-pulling mutual inductor in the arc detection sensor is connected with the input end of the signal conversion circuit;
the output end of the signal conversion circuit is connected with the input end of the band-pass filter;
the output end of the band-pass filter is connected with the first input end of the microprocessor;
and the output end of a direct current sensor in the arc detection sensor is connected with the second input end of the microprocessor.
Preferably, the band pass filter includes: the active high-pass filtering and amplifying module and the active low-pass filtering and amplifying module;
the input end of the active high-pass filtering amplification module is the input end of the band-pass filter;
the output end of the active high-pass filtering amplification module is connected with the input end of the active low-pass filtering amplification module;
the output end of the active low-pass filtering amplification module is the output end of the band-pass filter.
Preferably, the active high-pass filtering amplification module is a second-order high-pass Sallen-Key filter;
the active low-pass filtering amplification module is a second-order low-pass Sallen-Key filter.
Preferably, the active high-pass filtering amplification module is a fourth-order high-pass Sallen-Key filter;
the active low-pass filtering amplification module is a fourth-order low-pass Sallen-Key filter.
Preferably, the signal conversion circuit includes: a resistor and a capacitor;
two ends of the resistor are used as the input end of the signal conversion circuit and are connected between two output ends of the arc discharge mutual inductor;
one end of the resistor receives a reference voltage and is grounded through the capacitor;
and the other end of the resistor is used as the output end of the signal conversion circuit.
Preferably, the arc detection circuit further includes: a first multiplexer, a second multiplexer, and, additionally, at least one of said arc detection sensors and said signal conversion circuit to which the latter stage thereof is connected;
the first multiplexer is arranged between each signal conversion circuit and the band-pass filter, each input end of the first multiplexer is correspondingly connected with the output end of each signal conversion circuit one by one, and the output end of the first multiplexer is connected with the input end of the band-pass filter;
the second multiplexer is arranged between each arc detection circuit and the microprocessor, the input ends of the second multiplexer are respectively connected with the output ends of the direct current sensors in a one-to-one correspondence mode, and the output ends of the second multiplexer are connected with the second input end of the microprocessor.
Preferably, the first multiplexer and the second multiplexer are both controlled by the microprocessor.
Preferably, the other side of the microprocessor is provided with an arc-drawing alarm signal end and a communication end.
The utility model provides an arc detection sensor.A direct current sensor and an arc-drawing mutual inductor are arranged in a packaging shell of the arc detection sensor; a cable through which a current to be detected flows simultaneously penetrates through a magnetic core of the direct current sensor and a magnetic core of the arc transformer, an output end of the direct current sensor outputs a current measurement signal, and an output end of the arc transformer outputs a high-frequency current detection signal; that is, the direct current sensor and the arc transformer are integrated, but work independently, so that the influence of the error of the Hall current sensor on the arc detection result in the prior art is avoided, the problem of synchronous failure of alternating current and direct current sampling when the Hall current sensor fails is also avoided, and the reliability of arc detection is improved compared with the prior art. And the mutual inductor is adopted to sample the alternating current signal, so that the sampling precision of arc detection is further improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic circuit diagram of an arc detection sensor according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an arc detection circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an arc detection circuit according to an embodiment of the present invention;
fig. 4 is a circuit diagram of an active high-pass filtering amplifying module according to an embodiment of the present invention;
fig. 5 is a circuit diagram of an active low-pass filtering and amplifying module according to an embodiment of the present invention;
fig. 6 is a circuit diagram of a signal conversion circuit according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of an arc detection circuit according to an embodiment of the present invention;
fig. 8 is a circuit diagram of an arc detection circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The utility model provides an arc detection sensor to improve the reliability of arc detection.
Referring to fig. 1, the arc detection sensor includes: a package housing 101, and a direct current sensor 102 and a drawn arc transformer 103 disposed inside the package housing 101.
The cable through which the current Ip to be detected flows simultaneously passes through the magnetic core of the direct current sensor 102 and the magnetic core of the arc transformer 103; and further, the direct current collection and the alternating current collection of the current to be detected Ip are simultaneously realized by one integrated sensor, so that the current measurement and the high-frequency current detection of the current to be detected Ip are simultaneously realized.
Specifically, when the current Ip to be detected flows through the corresponding cable, the output terminal Vout of the dc current sensor 102 outputs a current measurement signal by the induction of the magnetic core of the dc current sensor 102 and the magnetic core of the arcing transformer 103, so as to implement the dc current measurement of the current Ip to be detected; and the output end CT +/CT-of the arc transformer 103 outputs a high-frequency current detection signal to finish the high-frequency current detection of the current Ip to be detected, thereby realizing the arc detection function.
In practical applications, the current to be detected Ip may be any current that needs to realize current measurement and high-frequency current detection at the same time, such as a direct current of a photovoltaic string, which is not limited herein and is within the protection scope of the present application.
The dc current sensor 102 may be a hall current sensor, and the power terminal Vcc is connected to the corresponding power source, and the ground terminal GND is connected to ground; in practical applications, the dc current sensor 102 may also be other devices in the prior art, and may be configured to measure the dc current of the current to be detected Ip, which is not limited herein and is within the protection scope of the present application depending on the specific application environment.
In addition, the arcing transformer 103 may be a high-frequency ac transformer, or may be another device in the prior art, and may be configured to detect a high-frequency current of the current Ip to be detected, which is not limited herein, and is within the protection scope of the present application depending on the specific application environment.
Compared with the prior art that only one Hall current sensor is adopted to simultaneously realize current measurement and arc detection, the embodiment superposes one high-frequency alternating current transformer on the basis of the original direct current sensor, the direct current sampling still uses the direct current sensor, and the weak arc discharge alternating current signal is sampled by adopting an independent transformer; further, alternating current and direct current signals can be collected simultaneously and relevant signals are output respectively, and a current measuring function and a high-frequency current detecting function are achieved simultaneously; and two sensors are independent in function and do not influence each other, so that the influence of errors of the Hall current sensor on an arc detection result in the prior art is avoided, the problem of synchronous failure of alternating current and direct current sampling when the Hall current sensor fails is also avoided, and the reliability of arc detection is improved compared with the prior art.
In addition, the mutual inductor is adopted to sample the alternating current signal, so that the sampling precision of arc detection is further improved compared with the prior art.
It should be noted that another arc detection scheme exists in the prior art, which is mainly to install a set of high-frequency current transformer in addition inside the photovoltaic inverter to be used for collecting ac signals separately. Although the sampling precision of the arc detection can be guaranteed, the system is high in cost, large in size and low in integration level.
On the basis that the electric arc detection reliability and the sampling precision can be guaranteed, the electric arc detection sensor provided by the embodiment encapsulates the direct current sensor 102 and the arc-pulling mutual inductor 103 into the whole integrated current sensor, compared with an implementation mode that a set of high-frequency current mutual inductor is independently installed in the prior art, the high-integration encapsulation is realized, the problem of installation space generated when the high-frequency current mutual inductor and the direct current sensor are separately arranged is effectively solved, the occupied area is reduced, and the system cost is reduced. That is, this arc detection sensor that this embodiment provided not only can synchronous detection alternating current-direct current signal, mutual independence work, and the integrated level is higher moreover, with low costs.
In practical applications, when the dc current sensor 102 and the arc transformer 103 are independently arranged, both of them need to be equipped with corresponding magnetic cores, and in the present embodiment, on the basis of the above embodiments, preferably, in the arc detection sensor, the dc current sensor 102 and the arc transformer 103 may use magnetic cores of the same set of specifications, that is, share the same magnetic core, so as to reduce the cost of repeatedly arranging devices, so that the integration degree of packaging the ac/dc sensors together is higher, and further, the cost is effectively reduced.
Another embodiment of the present invention further provides an arc detection circuit, as shown in fig. 2, including: a signal conversion circuit 20, a band pass filter 30, a microprocessor 40 and an arc detection sensor 10 as described in any of the above embodiments; wherein:
the specific structure and principle of the arc detection sensor 10 can be found in the above embodiments, and are not described herein again.
In the arc detection sensor 10, the output terminal of the arcing mutual inductor 103 is connected to the input terminal of the signal conversion circuit 20.
An output of the signal conversion circuit 20 is connected to an input of a band pass filter 30.
The output of the band-pass filter 30 is connected to a first input of a microprocessor 40.
The output of the dc current sensor 102 of the arc detection sensor 10 is connected to a second input of the microprocessor 40.
The arc detection circuit shown in fig. 2 specifically operates according to the following principle:
the output of the arc transformer 103 is a current signal, which needs to be converted into a voltage signal by the signal conversion circuit 20 for other circuits and devices to process.
The band-pass filter 30 is mainly used for filtering the signal output by the signal conversion circuit 20, only the frequency signal sensitive to the arc is reserved and amplified, and other signals are filtered; in practical applications, the bandpass frequency can be designed to be between 20Khz and 200Khz, which is not limited herein, depending on the application environment, and is within the protection scope of the present application.
The microprocessor 40 is used for sampling the signal output by the band-pass filter 30, performing algorithm analysis, and finally judging whether an arc discharge signal exists; and after analog-to-digital sampling and digital processing are performed on the current measurement signal output by the direct current sensor 102, current magnitude information of the current Ip to be detected is obtained.
On the basis of the above embodiments, the present embodiment provides a preferred structure of the band-pass filter 30, as shown in fig. 3, which specifically includes: an active high-pass filtering amplification module 301 and an active low-pass filtering amplification module 302; wherein:
the input terminal of the active high-pass filtering amplifying module 301 serves as the input terminal of the band-pass filter 30, and receives the signal output by the signal converting circuit 20.
The output end of the active high-pass filtering amplification module 301 is connected with the input end of the active low-pass filtering amplification module 302.
The output terminal of the active low-pass filtering and amplifying module 302 is used as the output terminal of the band-pass filter 30 and is connected to the first input terminal of the microprocessor 40.
In practical applications, preferably, the active high-pass filtering and amplifying module 301 is a second-order high-pass Sallen-Key filter; the active low-pass filtering amplification module 302 is a second-order low-pass Sallen-Key filter.
Referring to fig. 4, the second-order high-pass Sallen-Key filter specifically includes: the circuit comprises a first operational amplifier U1A, a third capacitor C3, a fourth capacitor C4, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6; the specific device connection relation is as follows:
one end of the third capacitor C3 is used as the input end of the active high-pass filtering amplification module 301.
The other end of the third capacitor C3 is connected to one end of the fourth capacitor C4 and one end of the fourth resistor R4, respectively.
The other end of the fourth capacitor C4 is connected to one end of the third resistor R3 and the non-inverting input terminal of the first operational amplifier U1A, respectively.
The other end of the third resistor R3 is grounded.
The inverting input terminal of the first operational amplifier U1A is connected to one terminal of the fifth resistor R5 and one terminal of the sixth resistor R6, respectively.
The other end of the fifth resistor R5 is connected to ground.
The other end of the sixth resistor R6 and the other end of the fourth resistor R4 are both connected to the output terminal of the first operational amplifier U1A, and the connection point is used as the output terminal of the active high-pass filtering and amplifying module 301.
The positive terminal of the first operational amplifier U1A is connected to the power supply Vdd, and the negative terminal of the first operational amplifier U1A is connected to ground.
Referring to fig. 5, the second-order low-pass Sallen-Key filter specifically includes: a second operational amplifier U1B, a seventh resistor R7, an eighth resistor R8, a fifth capacitor C5, a sixth capacitor C6, a ninth resistor R9 and a tenth resistor R10; the specific device connection relation is as follows:
one end of the seventh resistor R7 is used as the input end of the active low-pass filtering and amplifying module 302.
The other end of the seventh resistor R7 is connected to one end of the eighth resistor R8 and one end of the sixth capacitor C6, respectively.
The other end of the eighth resistor R8 is connected to one end of the fifth capacitor C5 and the non-inverting input terminal of the second operational amplifier U1B, respectively.
The other terminal of the fifth capacitor C5 is connected to ground.
The inverting input terminal of the second operational amplifier U1B is connected to one end of the ninth resistor R9 and one end of the tenth resistor R10, respectively.
The other end of the ninth resistor R9 is connected to ground.
The other end of the tenth resistor R10 and the other end of the sixth capacitor C6 are both connected to the output terminal of the second operational amplifier U1B, and the connection point is used as the output terminal of the active low-pass filtering and amplifying module 302.
The positive terminal of the power supply terminal of the second operational amplifier U1B is connected to the power supply Vdd, and the negative terminal of the power supply terminal of the second operational amplifier U1B is connected to ground.
In practical application, the amplification scale of the second-order high-pass Sallen-Key filter can be set by selecting the resistance values of the fifth resistor R5 and the sixth resistor R6; and the amplification scale setting of the second-order low-pass Sallen-Key filter can be realized by selecting the resistance values of the ninth resistor R9 and the tenth resistor R10. The magnitude of each resistance value and the amplification ratio achieved by the two are not limited herein, and are determined according to the specific application environment, and are all within the protection scope of the present application.
It should be noted that, the implementation manners of the band-pass filter 30 are various, and the second-order high-pass Sallen-Key filter and the second-order low-pass Sallen-Key filter are only one optional constituent manner, and in practical application, the two-order high-pass Sallen-Key filter and the second-order low-pass Sallen-Key filter can be completely replaced by a 4-order high-pass Sallen-Key filter and a 4-order low-pass Sallen-Key filter, that is, the active high-pass filtering and amplifying module 301 is a fourth-order high-pass Sallen-Key filter, and the active low-pass filtering and amplifying module 302 is a fourth-order low-pass Sallen-Key filter; in addition, other devices capable of implementing a band-pass filtering function may also be used to implement the band-pass filter 30, and are not limited to these two modes, depending on the specific application environment, and all of them are within the protection scope of the present application.
On the basis of the foregoing embodiments, the present embodiment provides a preferred implementation form of the signal conversion circuit 20, specifically as shown in fig. 6, including: a resistor R and a capacitor C; wherein:
two ends of the resistor R are used as the input end of the signal conversion circuit 20 and are connected between two output ends of the arc transformer 103, namely two poles CT +/CT-.
One end of the resistor R receives a reference voltage Vref and is grounded through a capacitor C;
the other end of the resistor R serves as an output terminal of the signal conversion circuit 20.
As can be seen from fig. 6, the signal conversion circuit 20 with this structure uses fewer devices, has simple connection relationship and low cost, and is beneficial to popularization and application of the arc detection circuit.
In practical applications, the resistor R and the capacitor C may be implemented by any device with the same function in series-parallel connection, and the signal conversion circuit 20 may also be implemented in other forms, not limited to the one shown in fig. 6, and any structure capable of converting a current signal into a voltage signal in the prior art may also be implemented, and also fall within the protection scope of the present application.
On the basis of the above embodiments, the present embodiment provides a preferred form of the microprocessor 40, which may be specifically configured in any form, and can realize the corresponding functions thereof, as long as the other side thereof is provided with the arc discharge alarm signal terminal and the communication terminal.
The arc-drawing alarm signal end has the following functions: when the microprocessor 40 detects that the arc intensity reaches a certain threshold value, the arc-drawing alarm signal can be output through the arc-drawing alarm signal end to give an alarm, and the arc-drawing overhaul reminding for operation and maintenance personnel is achieved.
Meanwhile, the arc state and the current magnitude information detected by the microprocessor 40 are also sent or read through the communication terminal, so that a corresponding detection reporting function is realized.
It should be noted that, in the current photovoltaic power generation system, there are usually a plurality of photovoltaic strings, and for the current of each photovoltaic string, arc detection is required, so in order to implement a current measurement function and a high-frequency current detection function for a plurality of currents Ip to be detected, the present embodiment provides a more preferable arc detection circuit:
on the basis of the above embodiment, preferably, as shown in fig. 7, the arc detection circuit further includes: a first multiplexer 50, a second multiplexer 60, and, additionally, at least one arc detecting sensor 10 and a signal converting circuit 20 connected thereto at a subsequent stage thereof.
Specifically, the first multiplexer 50 is disposed between each signal conversion circuit 20 and the band pass filter 30, and each input terminal thereof is connected to the output terminal of each signal conversion circuit 20 in a one-to-one correspondence manner, and the output terminal thereof is connected to the input terminal of the band pass filter 30.
The second multiplexer 60 is disposed between each arc detection circuit 10 and the microprocessor, and has input terminals connected to the output terminals of the dc current sensors 102 in a one-to-one correspondence, and an output terminal connected to a second input terminal of the microprocessor 40.
Preferably, the first multiplexer 50 and the second multiplexer 60 are both controlled by the microprocessor 40.
The signals output by the plurality of arc-drawing transformers 103 pass through the signal conversion circuit 20 and then enter the first multiplexer 50, and then the signals sequentially enter the band-pass filter 30 in the backward stage, are subjected to frequency selection and signal amplification and then enter the first input end of the microprocessor 40; similarly, the signal output by the dc current sensor 102 passes through the second multiplexer 60 and then is sequentially transmitted to the second input terminal of the microprocessor 40; the microprocessor 40 is responsible for sampling the sent signals, performing algorithm analysis, and finally making a judgment whether an arc discharge signal exists.
In connection with the above-mentioned embodiment, fig. 8 shows a specific form of the arc detection circuit, the two output terminals CT +/CT "of the arc transformer 103 are respectively connected to the adapted signal conversion circuit 20 (e.g., R1 and C1, and R2 and C2 shown in fig. 8), and the current signal output from the arc transformer 130 is converted into a voltage signal, which is then connected to an input terminal of the first multiplexer 50.
The first multiplexer 50 functions to: under the controlled condition, the signals output by the multiple signal conversion circuits 20 are sequentially transmitted to the subsequent stage circuit (i.e. the band-pass filter 30), specifically, as shown in fig. 8, the signals are sequentially sent to a second-order high-pass Sallen-Key filter and a second-order low-pass Sallen-Key filter, and after filtering and amplifying by the two-stage filters, the signals are finally sent to the microprocessor 40, and signal sampling and data analysis processing are completed.
It should be noted that, only two arc detection sensors 10 are shown in fig. 8 as an example, in practical application, the input channels of each multiplexer can be conveniently enlarged to expand the use scenarios of more arc detection sensors 10 so as to adapt to a high-power system, such as a high-power inverter, where it is a common configuration that a plurality of arc detection sensors are adopted on the dc side of the high-power system, and in this embodiment, by setting the multiplexers, each arc detection sensor 10 shares the subsequent bandpass filter 30 and the microprocessor 40, so that the implementation cost is saved, and the popularization and application are facilitated.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the above description of the disclosed embodiments, the features described in the embodiments in this specification may be replaced or combined with each other to enable those skilled in the art to make or use the utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (12)
1. An arc detection sensor, comprising: the direct current transformer and the arc transformer are arranged in the packaging shell; wherein:
a cable through which current to be detected flows simultaneously penetrates through a magnetic core of the direct current sensor and a magnetic core of the arc-pulling mutual inductor;
the output end of the direct current sensor outputs a current measurement signal;
and the output end of the arc transformer outputs a high-frequency current detection signal.
2. The arc detection sensor of claim 1, wherein said dc current sensor and said drawn arc transformer share a common magnetic core.
3. The arc detection sensor according to claim 1 or 2, wherein the direct current sensor is a hall current sensor.
4. The arc detection sensor according to claim 1 or 2, wherein the drawn arc transformer is a high frequency alternating current transformer.
5. An arc detection circuit, comprising: a signal conversion circuit, a band pass filter, a microprocessor and an arc detection sensor according to any one of claims 1 to 4; wherein:
the output end of an arc-pulling mutual inductor in the arc detection sensor is connected with the input end of the signal conversion circuit;
the output end of the signal conversion circuit is connected with the input end of the band-pass filter;
the output end of the band-pass filter is connected with the first input end of the microprocessor;
and the output end of a direct current sensor in the arc detection sensor is connected with the second input end of the microprocessor.
6. The arc detection circuit of claim 5 wherein the band pass filter comprises: the active high-pass filtering and amplifying module and the active low-pass filtering and amplifying module;
the input end of the active high-pass filtering amplification module is the input end of the band-pass filter;
the output end of the active high-pass filtering amplification module is connected with the input end of the active low-pass filtering amplification module;
the output end of the active low-pass filtering amplification module is the output end of the band-pass filter.
7. The arc detection circuit of claim 6, wherein the active high-pass filter amplification module is a second-order high-pass Sallen-Key filter;
the active low-pass filtering amplification module is a second-order low-pass Sallen-Key filter.
8. The arc detection circuit of claim 6, wherein the active high-pass filter amplification module is a fourth order high-pass Sallen-Key filter;
the active low-pass filtering amplification module is a fourth-order low-pass Sallen-Key filter.
9. The arc detection circuit of claim 5, wherein the signal conversion circuit comprises: a resistor and a capacitor;
two ends of the resistor are used as the input end of the signal conversion circuit and are connected between two output ends of the arc discharge mutual inductor;
one end of the resistor receives a reference voltage and is grounded through the capacitor;
and the other end of the resistor is used as the output end of the signal conversion circuit.
10. The arc detection circuit according to any of claims 5-9, further comprising: a first multiplexer, a second multiplexer, and, additionally, at least one of said arc detection sensors and said signal conversion circuit to which the latter stage thereof is connected;
the first multiplexer is arranged between each signal conversion circuit and the band-pass filter, each input end of the first multiplexer is correspondingly connected with the output end of each signal conversion circuit one by one, and the output end of the first multiplexer is connected with the input end of the band-pass filter;
the second multiplexer is arranged between each arc detection circuit and the microprocessor, the input ends of the second multiplexer are respectively connected with the output ends of the direct current sensors in a one-to-one correspondence mode, and the output ends of the second multiplexer are connected with the second input end of the microprocessor.
11. The arc detection circuit of claim 10 wherein said first multiplexer and said second multiplexer are controlled by said microprocessor.
12. The arc detection circuit according to any of claims 5-9, wherein the other side of the microprocessor is provided with an arc discharge alarm signal terminal and a communication terminal.
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| WO2024031960A1 (en) * | 2022-08-11 | 2024-02-15 | 台达电子工业股份有限公司 | Solar inverter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024031960A1 (en) * | 2022-08-11 | 2024-02-15 | 台达电子工业股份有限公司 | Solar inverter |
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