CN105939148B - Photovoltaic cell monitoring device - Google Patents
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- CN105939148B CN105939148B CN201610513063.6A CN201610513063A CN105939148B CN 105939148 B CN105939148 B CN 105939148B CN 201610513063 A CN201610513063 A CN 201610513063A CN 105939148 B CN105939148 B CN 105939148B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
- H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The invention mainly relates to a photovoltaic cell monitoring device, which comprises a communication module, wherein the communication module is used for forming a communication carrier on a transmission line connected with a positive electrode and a negative electrode of a photovoltaic cell so as to realize that the photovoltaic cell monitoring device sends first communication information outwards. A current sensing unit is included for monitoring current information in the transmission line. The photovoltaic cell monitoring device further comprises a band-pass filter, wherein the band-pass filter is used for detecting and extracting one or more preset signals with preset frequency ranges from the current information in a band-pass filtering mode, and the preset signals at least comprise second communication information which is transmitted from the outside of the photovoltaic cell monitoring device to the transmission line and is embodied as a communication carrier wave.
Description
Technical Field
The invention mainly relates to detection equipment, in particular to a photovoltaic cell monitoring device which is used for timely and effectively monitoring the current performance of a photovoltaic cell panel.
Background
With the rapid rise of solar photovoltaic power generation, the solar photovoltaic power generation device has great significance on the problems of energy, ecology, environment and the like and the sustainable development of society. The photovoltaic cell is used as an important component of a photovoltaic power generation system, the excellent performance of the photovoltaic cell directly influences the overall effect of the power generation system, but in practice, the photovoltaic cell is subjected to more restriction factors, and the characteristic difference of each cell assembly can cause the loss of the connection combination efficiency. The photovoltaic cell array is generally in a series-parallel connection mode, and if a certain cell assembly is subjected to power reduction caused by shadow, dust, shading or aging, all the cell assemblies connected in series in a link can be influenced by the reduction of current intensity. In order to guarantee the safety and reliability of the operation of the photovoltaic array, it is important to fully exert the maximum power generation efficiency of each photovoltaic cell module and guarantee that the photovoltaic cell module is in a normal working state, so that the real-time parameters such as output voltage, current, power and the ambient temperature where the photovoltaic cell module is located need to be monitored in time, and the abnormal conditions such as the damage or aging of a single cell need to be monitored in time, so that the monitoring information can provide a basis for the power optimization of each photovoltaic cell, and the failed or aged photovoltaic modules can be quickly positioned and repaired in time. Whether the external device is trying to actively control the photovoltaic cell or the parameter information of the photovoltaic cell is sent to the external device locally in lighting, the communication problem of the photovoltaic cell monitoring system is involved.
Disclosure of Invention
The invention provides a photovoltaic cell monitoring device, comprising:
the communication module is used for forming communication carriers on a transmission line connected with the anode and the cathode of the photovoltaic cell so as to realize that the photovoltaic cell monitoring device sends first communication information outwards;
a current detection unit for monitoring current information in the transmission line;
and the band-pass filter is used for detecting and extracting one or more preset signals with a preset frequency range from the current information in a band-pass filtering mode, and the preset signals at least comprise second communication information which is transmitted from the outside of the photovoltaic cell monitoring device to the transmission line and is embodied as a communication carrier wave.
The photovoltaic cell monitoring device further comprises a processor, and the communication module comprises a bypass capacitor and a switch device which are connected in series between the positive electrode and the negative electrode of the photovoltaic cell;
the switching device is used for being switched between an off state and an on state under the control of the processor in the phase that the photovoltaic cell monitoring device sends communication information, so that carrier current flowing through the communication circuit is generated at the moment that the switching device is switched on and is injected into the transmission line to form a communication carrier.
In the photovoltaic cell monitoring device, the communication module further includes a first bypass resistor connected in series between the positive electrode and the negative electrode of the photovoltaic cell together with the bypass capacitor and the switching device, and a second bypass resistor connected in parallel at two ends of the bypass capacitor;
the driving signal output by the processor for driving the switching state of the switching device is coupled to the control terminal of the switching device through a coupling capacitor.
In the above photovoltaic cell monitoring apparatus, the switch device is an NMOS transistor, the bypass capacitor and the first bypass resistor are connected in series between the drain of the NMOS transistor and the positive electrode of the photovoltaic cell, the negative electrode of the photovoltaic cell and the source of the NMOS transistor have the same reference ground potential, and the communication module further includes a resistor connected between the gate and the source of the NMOS transistor.
In the photovoltaic cell monitoring apparatus, the band-pass filter includes first and second input nodes respectively coupled to a pair of output terminals of the current detection unit:
a first resistor and a first capacitor are connected in series between the first input node and the inverting terminal of one operational amplifier in the band-pass filter, a second capacitor is connected between the interconnection node of the first resistor and the first capacitor and the output terminal of the operational amplifier, and the inverting terminal and the output terminal of the operational amplifier are connected with a second resistor; and
another third resistor is connected between the interconnection node and the second input node, i.e., the non-inverting terminal of the operational amplifier.
In the photovoltaic cell monitoring device, an overvoltage protection element is connected between the first input node and the second input node, and the overvoltage protection element is one of a transient voltage suppressor, a discharge tube and a piezoresistor or a combination of the transient voltage suppressor and the discharge tube.
The photovoltaic cell monitoring device further comprises a power supply module for converting the voltage generated by the photovoltaic cell into a voltage-stabilizing source, wherein the stabilized voltage provided by the power supply module is used for providing working voltage for the processor and the operational amplifier.
The photovoltaic cell monitoring device further comprises a voltage divider for dividing the stable voltage to generate a reference voltage, and the reference voltage is applied to the second input node.
In the photovoltaic cell monitoring apparatus, the band-pass filter further includes a test branch of a first detection resistor, a second detection resistor and a third capacitor connected in series between a detection node and a reference ground;
a first sense resistor coupled between the sense node and the first input node, a second sense resistor coupled between the first and second input nodes, and a third capacitor coupled between the second input node and a reference ground;
and a preset high-frequency pulse voltage output by the processor is loaded to the detection node to test the band-pass frequency band of the band-pass filter and provide a basis for calibrating the band-pass range.
In the photovoltaic cell monitoring device, the current detection unit is any one of a rogowski air-core coil sensor, a high-frequency sensor, a codec and a shunt.
Drawings
The features and advantages of the present invention will become apparent upon reading the following detailed description and upon reference to the following drawings:
figure 1 is a schematic diagram of tandem photovoltaic cells and their respective monitoring devices in use.
Fig. 2 is a block diagram of the overall structure of a single monitoring device.
Fig. 3 is a schematic diagram of the internal structural modules of a single monitoring device.
Detailed Description
Referring to fig. 1, the voltages of the PV cells PV _1, PV _2, and … … PV _ N (N is a natural number greater than 1) connected in series are added together to provide a larger dc voltage, and in a photovoltaic power generation system, a photovoltaic inverter (not shown) can convert the dc voltage into an ac voltage for grid-connected power generation. The photovoltaic cell PV _1 has a monitoring device DET _1 associated with it, the photovoltaic cell PV _2 has a monitoring device DET _2 associated with it, and so on, the photovoltaic cell PV _ N has a monitoring device DET _ N associated with it, the monitoring device can monitor the operating voltage and/or current and power of the photovoltaic cell, the ambient temperature in which it is located, and so on.
Referring to fig. 2, the spirit of the present invention is now illustrated by taking as AN example a single PV cell PV _1 and a monitoring device DET _1 used in conjunction with the single PV cell PV _1 in fig. 2, the monitoring device DET _1 at least includes a communication module 101, which is mainly used to form a communication carrier on a transmission line L AN connected to the positive and negative electrodes of the PV cell PV _1, and since the transmission line L AN connects all the PV cells in series, the communication carrier is broadcasted along the transmission line L AN, and any external electronic device with a current transformer can monitor the communication carrier from the transmission line L AN, thereby enabling the PV cell monitoring device DET _1 to SEND first communication information (SEND _ OUT) loaded on the transmission line L AN to the outside relative to itself.
In fig. 2, the monitoring device DET _1 further includes at least one current detection unit 102a, which may be any one of a rogowski air coil sensor, a high frequency sensor, a codec, a shunt, etc., and mainly detects and monitors a communication carrier transmitted from another device on the transmission line L AN, it has been discussed above that the monitoring device DET _1 may transmit first communication information on the transmission line L AN, which is transmission information, while the main carrier for which the monitoring device DET _1 monitors is the current detection unit 102a, and the current detection unit 102a extracts a carrier signal transmitted from another device from the current information flowing through the transmission line L AN, which is reception information.
In fig. 2, the monitoring device DET _1 further includes at least one band-pass filter 102, and since the current detecting unit 102a monitors the current information on the transmission line L AN and the current information is further transmitted to the band-pass filter 102, the band-pass filter 102 will detect and extract one or more preset signals with preset frequency range from the current information according to the expected design, and note that the preset signals at least include the second communication information (receiveved) which is also embodied as a communication carrier and is transmitted from the outside to the transmission line L AN.
Referring to fig. 2, the monitoring device DET _1 further includes at least one processor (MCU)103, and the carrier generated by the communication module 101 is implemented by driving the processor 103, that is, the data content carried by the first communication information sent by the communication module 101 to the outside depends on the processor 103. The data content carried by the second communication information detected by the band-pass filter 102 from outside is also delivered to the processor 103 for calculation and decoding. Considering that the scheme that the processor 103 monitors the voltage or the temperature of the photovoltaic cell PV _1 belongs to the known technology, for example, the voltage of the positive terminal of the photovoltaic cell PV _1 is collected and transmitted to the processor 103, for example, a thermistor is used to monitor the temperature, and therefore, the description is omitted.
Referring to fig. 3, an example of a two-way communication is illustrated. A communication module 101 is connected in series between the positive electrode and the negative electrode of the photovoltaic cell PV _1, and G is used for assuming the potential of the negative electrode of the photovoltaic cell PV _1 as a reference groundRThe potential is between the positive pole of the photovoltaic cell PV _1 and the reference ground GRConnect the communication module therebetween101. In some embodiments, a bypass capacitor C is providedBYAnd a switching device M connected in series between the positive pole of the photovoltaic cell PV _1 and the reference ground GRAnd by-pass the capacitance CBYAnd switching device M, the positions of both can be reversed so that high frequency switching of switching device M between on and off is sufficient to generate harmonic injection into transmission line L AN to perform the function of the present invention, but in a preferred embodiment of fig. 3, the positive pole of photovoltaic cell PV _1 and reference G are preceded byRA first bypass resistor R connected in series betweenBY1And a bypass capacitor CBYA switching device M, and a bypass capacitor CBYAre connected in parallel with a second shunt resistor RBY2。
Referring to fig. 3, in the communication module 101, a first bypass resistor RBY1And a bypass capacitor CBYAnd the switching device M may be any one of them in any positional relationship as long as they are connected in series. For example in an alternative embodiment not shown in the figures: a first input/output terminal of the switching device M is connected to the positive pole of the photovoltaic cell PV _1, a second input/output terminal of the switching device M and a reference ground GRIs connected with a first bypass resistor RBY1And a bypass capacitor CBYAnd R isBY1And CBYThe position of (a) can be reversed. Also for example in an alternative embodiment not shown in the figures: r is connected between the first input/output end of the switching device M and the anode of the photovoltaic cell PV _1BY1And CBYOne of them, the second input/output terminal of the switching device M and the reference ground GRIs indirectly connected with RBY1And CBYThe other of the two.
Referring to fig. 3, taking the example that the switching device M employs an NMOS mosfet, a first bypass resistor R is connected between a first input/output terminal (e.g., drain) of the switching device M and the anode of the photovoltaic cell PV _1BY1And a bypass capacitor CBYAnd R isBY1And CBYCan be reversed, and a second input/output terminal (e.g., source) of the switching device M is connected to the reference ground GRThe potential, the negative pole of the photovoltaic cell PV _1 is also at the reference ground GRElectric potential, thenBypass capacitor CBYAre connected in parallel with a second shunt resistor RBY2。
Referring to fig. 3, a driving signal transitioning between logic high and low levels output from an output port of the processor 103 is provided to a control terminal (e.g., a gate) of the switching device M, and it is noted that the driving signal is provided through a coupling capacitor C11A coupling capacitor C should be connected between the port for transmitting the control terminal of the switching device M, i.e. the port for generating the driving signal by the processor 103, and the control terminal of the switching device M11. In addition, a resistor R is preferably connected between the gate G and the source S of the N-channel type switching device M11Since an insulated gate oxide layer exists between the gate and the source of the NMOS field effect transistor, a parasitic capacitance C is generated between the gate and the sourceGSIt will store some residual charge to be superimposed on the grid, therefore it is likely to cause the error opening of NMOS, the resistance R11Corresponding to a bleed path for the charge.
Referring to FIG. 3, the capacitor C with bypassBYA bypass resistor RBY1In the communication circuit with the switching device M, the switching device M may be maintained in AN off state, if the processor 103 attempts to perform information interaction with the outside, the driving signal sent by the processor 103 may rapidly jump from a first logic state (e.g., low level) to a second logic state (e.g., high level) and then back to the first logic state, and the NMOS switching device M that is turned on and then turned off under the high level driving, or the driving signal sent by the processor 103 may rapidly jump from the first logic state (e.g., high level) to the second logic state (e.g., low level) and then back to the first logic state, such that the PMOS switching device M that is turned on under the low level driving is turned on and then off, and the off-on-off process of the switching device M may be repeated multiple timesThe current information on line L AN is used to extract the carrier signal sent by the communication circuit for demodulation, and this carrier information can be finally converted into binary symbols for information exchange according to the various communication protocols currently specified.
Referring to fig. 3, the monitoring device DET _1 has a band-pass filter 102 comprising a first input node N2_1And a second input node N2_2The current sensor/current detection unit 102a has a set of outputs DSA and DSB, and thus the first input node N of the band pass filter 102 is connected2_1Coupled to an output terminal DSA, a second input node N2_2Coupled to the output terminal DSB. First input node N2_1And a first resistor R connected in series between the inverting terminals of the operational amplifier A21And a first capacitor C21. And a first resistance R21And a first capacitor C21Interconnection node N between them2_3A second capacitor C is connected between the output end of the operational amplifier A and the ground22And the inverting terminal and the output terminal of the operational amplifier A are connected with a second resistor R22. And an interconnection node N2_3And a second input node N2_2That is, the positive phase terminal of the operational amplifier A is connected with a third resistor R23Note that the second input node N2_2Directly to the non-inverting terminal of the operational amplifier a. In addition, a first resistor R21And a first capacitor C21The specific positions of the two are as follows: a first resistor R21Is connected to a first input node N4_1And an interconnection node N2_3First capacitor C21Connected at an interconnection node N2_3And the inverting terminal of the operational amplifier a.
The band pass filter 102 is also optionally provided at the first input node N2_1And a second input node N2_2Connected with an overvoltage protection element between, when the first input node N2_1And a second input node N2_2When the voltage between the overvoltage protection element and the overvoltage protection element exceeds a protection specification value, the overvoltage protection element is triggered to be switched on to stabilize the voltage, and the suppression of the surge is realized. The overvoltage protection element is, for example, one of a transient voltage suppressor, a varistor, a discharge tube, or a combination of any two of themOr they may be used together in combination at the same time. With a Transient Voltage Suppressor (TVS) D21For example, its anode and cathode are oriented at node N2_1And node N2_2Are arbitrarily connected, e.g. anode to first input node N2_1And the cathode is connected to a second input node N2_2Or the anode is connected to the second input node N2_2And the cathode is connected to the first input node N2_1。
Referring to FIG. 3, the operational amplifier A in the band pass filter 102 outputs a result VOUT_ASThe processor 103 is further configured to receive the output voltage VOUT_ASBecause of VOUT_ASIt is noted that the current sensor/current detection unit 102a is configured to monitor the current information in the transmission line L AN, the band pass filter 102 is configured to detect and extract a predetermined signal having a predetermined frequency range from the current information, the predetermined signal having a predetermined frequency range that varies with the band pass range selected by the band pass filter 102, or the type of information represented by the predetermined signal, if we attempt to extract the information from the transmission line L AN, the frequency of the predetermined signal representing the communication information may be interpreted as a predetermined frequency range within a predetermined frequency range of 2.5, and the predetermined frequency range may be interpreted as a predetermined arc range of only about the arc range selected by the arc filter 102 (e.g., the predetermined arc range may be interpreted as a predetermined arc range of 2. the arc range is interpreted as AN arc range of the arc filter 102, or the predetermined arc range may be interpreted as AN arc range of the arc filter 102, or the arc filter 102 may be interpreted as AN arc filter 102, or a warning signal of the arc filter may be interpreted as AN arc filterThe arc signal in the first frequency range is detected from the current information, and the second communication information in the second frequency range can be detected from the current information, wherein the lower limit value of the frequency band in the first frequency range is higher than the upper limit value of the frequency band in the second frequency range.
Referring to fig. 3, the band pass filter 102 is, as an option, also at a detection node N2_4And ground GRA first detection resistor R is connected in series between24A second detection resistor R25And a third capacitance C23In the first detection resistor R24Connected to the detection node N2_4And a first input node N2_1Between, the second detection resistance R25Connected to a first input node N2_1And a second input node N2_2Between, a third capacitance C23Connected to a second input node N2_2And ground GRA predetermined high frequency pulse voltage outputted from the processor 103 is applied to the detection node N2_4To test whether the actual band pass frequency band of the band pass filter 102 meets the expected design target, the test result can be completely determined from the output voltage VOUT_ASAnd provide a basis for calibrating the bandpass range.
Referring to fig. 3, the monitoring device DET _1 further includes a power supply module 104 for converting the voltage generated by the photovoltaic cell into a regulated voltage source, and the power supply module 104 extracts the voltage from the positive electrode of the photovoltaic cell PV _1 and generates a reference ground GRThe voltage conversion of DC/DC is realized, and the stable voltage is provided for providing the working voltage for the processor 104 and the operational amplifier a, where the zero potential reference points of the processor 104 and the operational amplifier a are both the reference ground GR. In addition, the monitoring device DET _1 further includes a voltage divider 102b for dividing the voltage-stabilized source provided by the power supply module 104 and applying the divided voltage value as a reference voltage to the second input node N2_2At a first input node N2_1And a second input node N2_2The ripple voltage induced by the current detecting unit 102a and input in between will raise the reference voltage by such an amplitude as to amplify the input signalThe source enhances the detection capability of the band pass filter 102, and prevents the signal voltage generated at the DSA and DSB from being too small to be detected.
While the present invention has been described with reference to the preferred embodiments and illustrative embodiments, it is to be understood that the invention as described is not limited to the disclosed embodiments. Various alterations and modifications will no doubt become apparent to those skilled in the art after having read the above description. Therefore, the appended claims should be construed to cover all such variations and modifications as fall within the true spirit and scope of the invention. Any and all equivalent ranges and contents within the scope of the claims should be considered to be within the intent and scope of the present invention.
Claims (6)
1. A photovoltaic cell monitoring device, comprising:
the communication module is used for forming communication carriers on a transmission line connected with the anode and the cathode of the photovoltaic cell so as to realize that the photovoltaic cell monitoring device sends first communication information outwards;
a current detection unit for monitoring current information in the transmission line;
a band-pass filter, configured to detect and extract one or more preset signals with a preset frequency range from the current information in a band-pass filtering manner, where the preset signals include at least second communication information that is sent from outside the photovoltaic cell monitoring apparatus to the transmission line and is embodied as a communication carrier;
a processor; and
the communication module comprises a bypass capacitor and a switch device which are connected in series between the positive electrode and the negative electrode of the photovoltaic cell;
the switching device is used for being switched between an off state and an on state under the control of the processor in the phase that the photovoltaic cell monitoring device sends communication information, so that carrier current flowing through the communication module is generated at the moment that the switching device is switched on and is injected onto the transmission line to form a communication carrier;
the communication module further comprises a first bypass resistor connected in series between the positive electrode and the negative electrode of the photovoltaic cell together with the bypass capacitor and the switching device, and a second bypass resistor connected in parallel at two ends of the bypass capacitor, wherein a driving signal output by the processor and used for driving the switching state of the switching device is coupled to a control end of the switching device through a coupling capacitor;
the band-pass filter comprises a first input node and a second input node which are respectively coupled to a pair of output ends of the current detection unit, a first resistor and a first capacitor are connected in series between the first input node and the inverting end of one operational amplifier in the band-pass filter, a second capacitor is connected between the interconnection node of the first resistor and the first capacitor and the output end of the operational amplifier, the inverting end and the output end of the operational amplifier are connected with a second resistor, and another third resistor is connected between the interconnection node and the second input node, namely the inverting end of the operational amplifier;
the band-pass filter also comprises a first detection resistor, a second detection resistor and a test branch of a third capacitor which are connected between a detection node and a reference ground in series, wherein the potential of the negative electrode of the photovoltaic cell is the reference ground potential;
a first sense resistor coupled between the sense node and the first input node, a second sense resistor coupled between the first and second input nodes, and a third capacitor coupled between the second input node and a reference ground;
and a preset high-frequency pulse voltage output by the processor is loaded to the detection node to test the band-pass frequency band of the band-pass filter and provide a basis for calibrating the band-pass range.
2. The pv cell monitoring apparatus of claim 1, wherein the switching device is an NMOS transistor, the bypass capacitor and the first bypass resistor are connected in series between a drain of the NMOS transistor and a positive terminal of the pv cell, a negative terminal of the pv cell and a source of the NMOS transistor have the same ground reference potential, and the communication module further comprises a resistor connected between a gate and a source of the NMOS transistor.
3. The photovoltaic cell monitoring device of claim 1, wherein an overvoltage protection element is connected between the first and second input nodes, the overvoltage protection element being one of a transient voltage suppressor, a discharge tube, a varistor, or a combination thereof.
4. The pv cell monitoring apparatus of claim 1 further comprising a power supply module for converting the voltage generated by the pv cell to a regulated voltage source, the regulated voltage provided by the power supply module being used to provide operating voltage for the processor and the operational amplifier.
5. The pv cell monitoring apparatus of claim 4 further comprising a voltage divider for dividing the regulated voltage to produce a reference voltage, the reference voltage being applied to the second input node.
6. The photovoltaic cell monitoring device according to claim 1, wherein the current detection unit is any one of a high frequency sensor, a codec, and a shunt.
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| CN108183684B (en) * | 2016-12-08 | 2020-10-09 | 丰郅(上海)新能源科技有限公司 | Photovoltaic module monitoring system integrating communication function |
| CN108183683B (en) * | 2016-12-08 | 2020-09-08 | 丰郅(上海)新能源科技有限公司 | Photovoltaic module monitoring system with fault turn-off function |
| CN108199681B (en) * | 2016-12-08 | 2020-10-09 | 丰郅(上海)新能源科技有限公司 | Photovoltaic module power optimization circuit and communication method thereof |
| CN107070402A (en) * | 2017-06-07 | 2017-08-18 | 江苏集能易新能源技术有限公司 | A kind of intelligent monitor for being integrated in photovoltaic component terminal box |
| CN109818567B (en) * | 2017-11-18 | 2021-05-14 | 丰郅(上海)新能源科技有限公司 | Parallel or series connection type turn-off system for photovoltaic module |
| US11709383B2 (en) | 2018-06-12 | 2023-07-25 | Raymond Hoheisel | Optical communication and power generation device and method |
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| CN204423627U (en) * | 2014-12-31 | 2015-06-24 | 天津益华微电子有限公司 | Photo-voltaic power generation station cell panel power line carrier monitoring system |
| CN105322981A (en) * | 2014-06-30 | 2016-02-10 | 深圳友讯达科技股份有限公司 | Dual-mode heterogeneous communication device |
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2016
- 2016-07-01 CN CN201610513063.6A patent/CN105939148B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104180862A (en) * | 2013-05-28 | 2014-12-03 | 艾默生过程控制流量技术有限公司 | Two-wire mode flow meter transmitter, flow meter and flow meter system |
| CN103560767A (en) * | 2013-10-23 | 2014-02-05 | 国家电网公司 | Band-pass filter circuit |
| CN105322981A (en) * | 2014-06-30 | 2016-02-10 | 深圳友讯达科技股份有限公司 | Dual-mode heterogeneous communication device |
| CN204423627U (en) * | 2014-12-31 | 2015-06-24 | 天津益华微电子有限公司 | Photo-voltaic power generation station cell panel power line carrier monitoring system |
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