CN201839039U - Photovoltaic charge-discharge control device with free capacity expansion - Google Patents
Photovoltaic charge-discharge control device with free capacity expansion Download PDFInfo
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- CN201839039U CN201839039U CN2010205948277U CN201020594827U CN201839039U CN 201839039 U CN201839039 U CN 201839039U CN 2010205948277 U CN2010205948277 U CN 2010205948277U CN 201020594827 U CN201020594827 U CN 201020594827U CN 201839039 U CN201839039 U CN 201839039U
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- 238000001514 detection method Methods 0.000 claims abstract description 64
- 239000003990 capacitor Substances 0.000 claims description 24
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- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000009966 trimming Methods 0.000 description 4
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Abstract
The utility model discloses a photovoltaic charge-discharge control device with free capacity expansion, comprising a solar battery pack, a storage battery, a first relay and a second relay used for capacity expansion and a detection control circuit used for driving the first relay and the second relay to work; the output of the solar battery pack is connected with the input of the storage battery through the first relay; the output of the storage battery is connected with the input of the load through the second relay; the detection control circuit is provided with two output ends and a voltage detection port, wherein the two output ends are connected with input ends of coils of the first relay and the second relay respectively, and the voltage detection port of the detection control circuit is connected with the output of the storage battery. The photovoltaic charge-discharge control device with the free capacity expansion not only realizes effective control for the charge and discharge of storage batteries, but also achieves the aim of free capacity expansion, and has the characteristics of simple control, high sensitivity and reliable running.
Description
Technical Field
The utility model relates to a photovoltaic charge and discharge field especially relates to a photovoltaic charge and discharge controlling means that control is simple, sensitive, dilatation at will.
Background
At present, in a photovoltaic system, a charge and discharge controller is generally required to be additionally arranged among a solar cell module, a storage battery and a load, so that the output of the solar cell module is connected with the input of the storage battery through the charge and discharge controller, and the output of the storage battery is connected with the input of the load through the charge and discharge controller, thereby protecting the storage battery from being influenced by overcharge and overdischarge. However, most of the charge and discharge controllers in the prior art have the defects of limited control precision, complex circuit, insufficient protection of the storage battery and the like. In particular, the prior art charge and discharge controller is troublesome to expand, and in the actual operation process, either the original controller is basically replaced completely or the number of the controllers is increased, which results in very high cost. Therefore, the difficulty of local capacity expansion is high, which is not beneficial to upgrading or capacity expansion of the photovoltaic system according to different occasions or user requirements.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide a photovoltaic charge and discharge control device of dilatation at will, adopt relay and corresponding control circuit to control, not only realized effective control and protection to battery charge and discharge, reached the purpose of dilatation at will moreover to the weak point that prior art's charge and discharge controller exists has been overcome.
The utility model provides a technical scheme that its technical problem adopted is: a photovoltaic charge-discharge control device capable of randomly expanding capacity comprises a solar cell module and a storage battery; the device also comprises a first relay, a second relay and a detection control circuit, wherein the first relay and the second relay can be used for capacity expansion, and the detection control circuit is used for driving the first relay and the second relay to work; the output of the solar cell module is connected with the input of the storage battery through a first relay; the output of the storage battery is connected with the input of the load through a second relay; the detection control circuit is provided with two output ends and a voltage detection port, the two output ends are respectively connected with the input ends of the coils of the first relay and the second relay, and the voltage detection port of the detection control circuit is connected with the output of the storage battery.
The detection control circuit comprises a voltage detection circuit, a first drive circuit and a second drive circuit; the output of the voltage detection circuit is respectively connected with the input ends of a first drive circuit and a second drive circuit, the output ends of the first drive circuit and the second drive circuit are respectively two output ends of the detection control circuit, the output end of the first drive circuit is connected with the input end of the coil of the first relay, and the output end of the second drive circuit is connected with the input end of the coil of the second relay; the input of the voltage detection circuit forms a voltage detection port of the detection control circuit, and the input of the voltage detection circuit is connected with the output of the storage battery.
The voltage detection circuit comprises a control chip, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor and a voltage stabilizing diode, wherein the control chip is provided with 14 pins, a 12 th pin of the control chip is an output end of the voltage detection circuit, and the 12 th pin is connected with the input of the first driving circuit; the 11 th pin of the control chip is the other output end of the voltage detection circuit, and the 11 th pin is connected with the input of the second driving circuit; the 2 nd pin of the control chip is the input end of the voltage detection circuit; the No. 2 pin of the control chip is connected with the anode of the storage battery through a first resistor; one end of the second resistor, one end of the third resistor, one end of the fourth resistor, one end of the fifth resistor, one end of the sixth resistor and one end of the seventh resistor are respectively and correspondingly connected with a No. 2 pin, a No. 4 pin, a No. 8 pin, a No. 7 pin, a No. 6 pin and a No. 5 pin of the control chip, and the other ends of the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor and the seventh resistor are respectively grounded; a 14 th pin of the control chip is a positive power supply input end of the control chip, and the 14 th pin of the control chip is connected with the positive electrode of the storage battery through an eighth resistor; the 1 st pin of the control chip is a power supply negative input end of the control chip, and the 1 st pin of the control chip is grounded; the first capacitor and the voltage stabilizing diode are connected between the 14 th pin and the 1 st pin of the control chip in parallel.
The first driving circuit comprises a ninth resistor, a first triode and a second capacitor; a 12 th pin of the control chip is connected with a base electrode of the first triode through a ninth resistor; the emitter of the first triode is grounded, the collector of the first triode is connected with one end of the coil input of the first relay, the other end of the coil input of the first relay is connected with the anode of the storage battery, and the second capacitor is connected between the coil input ends of the first relay; the movable contact of the first relay is connected with the anode of the storage battery, and the normally closed contact of the first relay is connected with the anode of the solar battery component; the cathode of the solar cell module is grounded.
The second driving circuit comprises a tenth resistor, a second triode and a third capacitor; the 11 th pin of the control chip is connected with the base electrode of the second triode through a tenth resistor; the emitter of the second triode is grounded, the collector of the second triode is connected with one end of the coil input of the second relay, the other end of the coil input of the second relay is connected with the anode of the storage battery, and a third capacitor is connected between the two coil input ends of the second relay; the movable contact of the second relay is connected with the anode of the storage battery, and the normally closed contact of the second relay is connected with the anode of the load; and the negative electrodes of the storage battery and the load are grounded.
Furthermore, the device also comprises an alarm control circuit; the alarm control circuit comprises a third relay, a third triode, an eleventh resistor and a fourth capacitor; the 10 th pin of the control chip is an output end, and the 10 th pin of the control chip is connected with the base electrode of the third triode through an eleventh resistor; the collector of the third triode is connected with one end of the coil input of the third relay; the other end of the coil input of the third relay is connected with the anode of the storage battery; the fourth capacitor is connected between the coil input ends of the third relay; the moving contact of the third relay is connected with one control end of an alarm device, and the normally open contact of the third relay is connected with the other control end of the alarm device.
The utility model has the advantages that the solar cell module comprises a first relay, a second relay and a detection control circuit for controlling the first relay and the second relay to act, the first relay is connected between the solar cell module and the storage battery, the second relay is connected between the storage battery and the load, the output of the detection control circuit is respectively connected with the input ends of the coils of the first relay and the second relay, the detection control circuit is provided with a voltage detection port which is connected with the output of the storage battery, so that the detection control circuit can detect the voltage of the storage battery in real time, and when the storage battery is in an over-charging or over-voltage state, a control signal is output, the first relay and the second relay act respectively to close the solar cell module and the load, when the storage battery is in an over-discharging state, the second relay acts to close the load, meanwhile, the solar cell module keeps a charging state on the storage battery. Therefore, the utility model has the characteristics of control is simple, control sensitivity is high, the operation is reliable, can improve the life of battery greatly. In addition, because the first relay and the second relay that connect in the circuit can further carry out the dilatation respectively and connect, therefore this controlling means compares with prior art, need not to change whole controlling means, also need not to increase controlling means's quantity, and only need change the capacity of relay, can reach the purpose of dilatation at will to from the cost is practiced thrift a large amount.
The present invention will be described in further detail with reference to the accompanying drawings and examples; however, the present invention is not limited to the embodiment, and the photovoltaic charge/discharge control device and the control method thereof are capable of arbitrarily expanding the volume.
Drawings
FIG. 1 is a schematic block diagram of the present invention;
FIG. 2 is a schematic diagram of the circuit connection of the present invention;
FIG. 3 is a schematic block diagram of the present invention after expansion;
fig. 4 is a schematic diagram of the circuit connection after expansion of the present invention.
Detailed Description
In a first embodiment, please refer to fig. 1, a photovoltaic charge and discharge control apparatus capable of randomly expanding capacity of the present invention includes a solar cell module 1, a storage battery 4, a first relay 2 and a second relay 5 for expanding capacity, and a detection control circuit 3 for driving the first relay 2 and the second relay 5 to operate; the output of the solar cell module 1 is connected with the input of the storage battery 4 through the first relay 2; the output of the storage battery 4 is connected with the input of the load 6 through a second relay 5; the detection control circuit 3 is provided with two output ends and a voltage detection port, the two output ends are respectively connected with the input ends of the coils of the first relay 2 and the second relay 5, and the voltage detection port of the detection control circuit 3 is connected with the output of the storage battery 4.
Wherein,
the detection control circuit 3 comprises a voltage detection circuit, a first drive circuit and a second drive circuit; the output of the voltage detection circuit is respectively connected with the input ends of a first drive circuit and a second drive circuit, the output ends of the first drive circuit and the second drive circuit are respectively two output ends of the detection control circuit 3, the output end of the first drive circuit is connected with the input end of the coil of the first relay 2, and the output end of the second drive circuit is connected with the input end of the coil of the second relay 5; the input of the voltage detection circuit forms the voltage detection port of the detection control circuit 3, and the input of the voltage detection circuit is connected with the output of the storage battery 4;
referring to fig. 2, the voltage detection circuit includes a control chip IC1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first capacitor C1, and a zener diode D1, the control chip IC1 has 14 pins, a 12 th pin of the control chip IC1 is an output terminal of the voltage detection circuit, and the 12 th pin is connected to an input of the first driving circuit; the 11 th pin of the control chip IC1 is the other output end of the voltage detection circuit, and the 11 th pin is connected with the input of the second driving circuit; the 2 nd pin of the control chip IC1 is the input end of the voltage detection circuit; the 2 nd pin of the control chip IC1 is connected with the anode of the storage battery through a first resistor R1; one end of a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7 is respectively and correspondingly connected with a 2 nd pin, a 4 th pin, an 8 th pin, a 7 th pin, a 6 th pin and a 5 th pin of the control chip IC1, and the other end of the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7 are respectively grounded; a 14 th pin of the control chip IC1 is a positive power supply input end of the control chip, and the 14 th pin of the control chip IC1 is connected with the positive electrode of the storage battery through an eighth resistor R8; the 1 st pin of the control chip IC1 is a power supply negative input end of the control chip, and the 1 st pin of the control chip IC1 is grounded; the first capacitor C1 and the zener diode D1 are connected in parallel between the 14 th pin and the 1 st pin of the control chip IC 1;
the first driving circuit comprises a ninth resistor R9, a first triode BG1 and a second capacitor C2; a 12 th pin of the control chip IC1 is connected with the base electrode of a first triode BG1 through a ninth resistor R9; an emitting electrode of the first triode BG1 is grounded, a collector electrode of the first triode BG1 is connected with one end of a coil input of the first relay JK1, the other end of the coil input of the first relay JK1 is connected with the positive electrode of the storage battery, and a second capacitor C2 is connected between coil input ends of the first relay JK 1; the movable contact of the first relay JK1 is connected with the anode of the storage battery, and the normally closed contact of the first relay JK1 is connected with the anode of the solar battery component; the negative electrode of the solar cell module is grounded to GND;
the second driving circuit comprises a tenth resistor R10, a second triode BG2 and a third capacitor C3; the 11 th pin of the control chip IC1 is connected with the base electrode of a second triode BG2 through a tenth resistor R10; an emitter of the second triode BG2 is grounded GND, a collector of the second triode BG2 is connected with one end of the coil input of the second relay JK2, the other end of the coil input of the second relay JK2 is connected with the positive electrode of the storage battery, and a third capacitor C3 is connected between the coil input ends of the second relay JK 2; the movable contact of the second relay JK2 is connected with the anode of the storage battery, and the normally closed contact of the second relay JK2 is connected with the anode of a load; the negative electrodes of the storage battery and the load are both grounded GND;
furthermore, the device also comprises an alarm control circuit; the alarm control circuit comprises a third relay JK3, a third triode BG3, an eleventh resistor R11 and a fourth capacitor C4; a 10 th pin of the control chip IC1 is an output end, and the 10 th pin of the control chip IC1 is connected with a base electrode of a third triode BG3 through an eleventh resistor R11; an emitting electrode of the third triode BG3 is grounded GND, and a collector electrode of the third triode BG3 is connected with one end of the coil input of the third relay JK 3; the other end of the coil input of the third relay JK3 is connected with the positive electrode of the storage battery; the fourth capacitor C4 is connected between the coil input terminals of the third relay JK 3; the movable contact of the third relay JK3 is connected with one control end of an alarm device, and the normally open contact of the third relay JK3 is connected with the other control end of the alarm device.
The utility model discloses a photovoltaic charge and discharge control device of dilatation at will, the 12 th pin and the 11 th pin of its control chip IC1 are steerable time delay output, and fourth resistance R4, fifth resistance R5, sixth resistance R6 and seventh resistance R7 are finely tuned to this control chip IC1 accessible, realize the accurate detection of this control chip to the voltage point of battery. Here, assuming that the open circuit voltage of the battery is 68 v, the overvoltage point voltage is 66 v, and the overdischarge point voltage is 42 v, the trimming fourth resistor R4 may make the voltage detected by the control chip IC1 accurate to 68 v, the trimming fifth resistor R5 may make the voltage detected by the control chip IC1 accurate to 66-57 v, the trimming sixth resistor R6 may make the voltage detected by the control chip IC1 accurate to 43 v, and the trimming seventh resistor R7 may make the voltage detected by the control chip IC1 accurate to 42-47 v.
The utility model discloses a photovoltaic charge and discharge control device of dilatation at will, its specific control process is: the 2 nd pin of the control chip IC1 detects the voltage of the storage battery in real time and judges whether the voltage of the storage battery is higher than the open-circuit voltage (68V) of the storage battery or whether the storage battery is in an overvoltage state (higher than 66V); if the voltage of the storage battery is higher than 57 volts and lower than 68 volts, two output ends of the control chip IC1 respectively delay for 1 minute to output control signals, and the first relay JK1 and the second relay JK2 respectively disconnect the movable contact and the normally closed contact under the driving of the corresponding control signals, so that the solar battery assembly does not charge the storage battery, and simultaneously close the load; otherwise, the moving contacts and the normally closed contacts of the first relay and the second relay respectively keep in a pull-in state; if the control chip IC1 detects that the voltage of the storage battery reaches 68V, a control signal is immediately output, and the first relay JK1 and the second relay JK2 are forced to respectively disconnect the movable contact and the normally closed contact, so that the solar battery assembly does not charge the storage battery, and the load is closed; if the control chip IC1 detects that the voltage of the storage battery is 43V, a control signal is output to the alarm control circuit, so that the movable contact and the normally open contact of the third relay JK3 are attracted, the alarm device is switched on, and an alarm signal is output to inform a user in advance that the storage battery is in an over-discharge state; if the control chip IC2 detects that the voltage of the storage battery is 42V, a control signal is output to the second relay JK2 after the time delay of 30 seconds, so that the second relay JK2 breaks off the movable contact and the normally closed contact, and meanwhile, the movable contact and the normally closed contact of the first relay JK1 are kept in a pull-in state, and the solar battery assembly can charge the storage battery.
The utility model discloses a photovoltaic charge and discharge control device of dilatation at will connects solar module with the normally closed contact of first relay JK1, makes the load connect the normally closed contact of second relay JK2, can make solar module and load homoenergetic work when the voltage of battery is normal, and only be in open circuit voltage or excessive pressure or the state of putting excessively at the battery, just can take corresponding action under the action of first relay JK1 and second relay JK 2. The output of the control chip IC1 is set to be controllable delay output, so that the oscillation phenomenon of the circuit can be avoided, and the storage battery is further protected.
In the second embodiment, please refer to fig. 3, which is different from the first embodiment in that: capacity expansion is carried out on the basis of the first relay 2 and the second relay 5, and a charging relay 7 and a discharging relay 8 are added; the charging relay 7 is used for expanding the capacity of the first relay 2, and the discharging relay 8 is used for expanding the capacity of the second relay 5; the output of the solar cell module 1 is connected with the input of the storage battery 4 through a charging relay 7, and the output of the storage battery 4 is connected with the input of the load through a discharging relay 8.
Please refer to fig. 2, which is different from fig. 2 in the first embodiment: the normally closed contact of a first relay JK1 is connected with the charging relay 7, and the normally closed contact of a second relay JK2 is connected with the discharging relay 8; the solar cell module is connected with the storage battery through a charging relay 7, and the load is connected with the storage battery through a discharging relay 7; a diode D2 is also connected to the positive pole of the accumulator, and the connection of the diode D2 can prevent the reverse polarity of the accumulator during the connection.
To sum up, the utility model discloses a photovoltaic charge-discharge control device of dilatation at will not only can carry out effective control to the charge-discharge condition of battery to have characteristics such as control is simple, the operation is reliable, can reach the purpose of dilatation at will moreover.
The above-mentioned embodiment is only used for further explaining the utility model discloses a photovoltaic charge and discharge control device of dilatation at will, nevertheless the utility model discloses not limit to the embodiment, all be according to the utility model discloses a technical entity all falls into the protection scope of the technical scheme of the utility model to any simple modification, the equivalent change and the decoration that the above embodiment was done.
Claims (6)
1. A photovoltaic charge-discharge control device capable of randomly expanding capacity comprises a solar cell module and a storage battery; the method is characterized in that: the device also comprises a first relay, a second relay and a detection control circuit, wherein the first relay and the second relay can be used for capacity expansion, and the detection control circuit is used for driving the first relay and the second relay to work; the output of the solar cell module is connected with the input of the storage battery through a first relay; the output of the storage battery is connected with the input of the load through a second relay; the detection control circuit is provided with two output ends and a voltage detection port, the two output ends are respectively connected with the input ends of the coils of the first relay and the second relay, and the voltage detection port of the detection control circuit is connected with the output of the storage battery.
2. The photovoltaic charge-discharge control device capable of being optionally expanded according to claim 1, wherein: the detection control circuit comprises a voltage detection circuit, a first drive circuit and a second drive circuit; the output of the voltage detection circuit is respectively connected with the input ends of a first drive circuit and a second drive circuit, the output ends of the first drive circuit and the second drive circuit are respectively two output ends of the detection control circuit, the output end of the first drive circuit is connected with the input end of the coil of the first relay, and the output end of the second drive circuit is connected with the input end of the coil of the second relay; the input of the voltage detection circuit forms a voltage detection port of the detection control circuit, and the input of the voltage detection circuit is connected with the output of the storage battery.
3. The photovoltaic charge-discharge control device capable of being optionally expanded according to claim 2, wherein: the voltage detection circuit comprises a control chip, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor and a voltage stabilizing diode, wherein the control chip is provided with 14 pins, a 12 th pin of the control chip is an output end of the voltage detection circuit, and the 12 th pin is connected with the input of the first driving circuit; the 11 th pin of the control chip is the other output end of the voltage detection circuit, and the 11 th pin is connected with the input of the second driving circuit; the 2 nd pin of the control chip is the input end of the voltage detection circuit; the No. 2 pin of the control chip is connected with the anode of the storage battery through a first resistor; one end of the second resistor, one end of the third resistor, one end of the fourth resistor, one end of the fifth resistor, one end of the sixth resistor and one end of the seventh resistor are respectively and correspondingly connected with a No. 2 pin, a No. 4 pin, a No. 8 pin, a No. 7 pin, a No. 6 pin and a No. 5 pin of the control chip, and the other ends of the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor and the seventh resistor are respectively grounded; a 14 th pin of the control chip is a positive power supply input end of the control chip, and the 14 th pin of the control chip is connected with the positive electrode of the storage battery through an eighth resistor; the 1 st pin of the control chip is a power supply negative input end of the control chip, and the 1 st pin of the control chip is grounded; the first capacitor and the voltage stabilizing diode are connected between the 14 th pin and the 1 st pin of the control chip in parallel.
4. The photovoltaic charge-discharge control device capable of being optionally expanded according to claim 3, wherein: the first driving circuit comprises a ninth resistor, a first triode and a second capacitor; a 12 th pin of the control chip is connected with a base electrode of the first triode through a ninth resistor; the emitter of the first triode is grounded, the collector of the first triode is connected with one end of the coil input of the first relay, the other end of the coil input of the first relay is connected with the anode of the storage battery, and the second capacitor is connected between the coil input ends of the first relay; the movable contact of the first relay is connected with the anode of the storage battery, and the normally closed contact of the first relay is connected with the anode of the solar battery component; the cathode of the solar cell module is grounded.
5. The photovoltaic charge-discharge control device capable of being optionally expanded according to claim 3, wherein: the second driving circuit comprises a tenth resistor, a second triode and a third capacitor; the 11 th pin of the control chip is connected with the base electrode of the second triode through a tenth resistor; the emitter of the second triode is grounded, the collector of the second triode is connected with one end of the coil input of the second relay, the other end of the coil input of the second relay is connected with the positive electrode of the storage battery, and a third capacitor is connected between the coil input ends of the second relay; the movable contact of the second relay is connected with the anode of the storage battery, and the normally closed contact of the second relay is connected with the anode of the load; and the negative electrodes of the storage battery and the load are grounded.
6. The photovoltaic charge-discharge control device capable of being optionally expanded according to claim 3, wherein: furthermore, the device also comprises an alarm control circuit; the alarm control circuit comprises a third relay, a third triode, an eleventh resistor and a fourth capacitor; the 10 th pin of the control chip is an output end, and the 10 th pin of the control chip is connected with the base electrode of the third triode through an eleventh resistor; the emitter of the third triode is grounded, and the collector of the third triode is connected with one end of the coil input of the third relay; the other end of the coil input of the third relay is connected with the anode of the storage battery; the fourth capacitor is connected between the two coil input ends of the third relay; the moving contact of the third relay is connected with one control end of an alarm device, and the normally open contact of the third relay is connected with the other control end of the alarm device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010205948277U CN201839039U (en) | 2010-11-05 | 2010-11-05 | Photovoltaic charge-discharge control device with free capacity expansion |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010205948277U CN201839039U (en) | 2010-11-05 | 2010-11-05 | Photovoltaic charge-discharge control device with free capacity expansion |
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| CN201839039U true CN201839039U (en) | 2011-05-18 |
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| CN2010205948277U Expired - Fee Related CN201839039U (en) | 2010-11-05 | 2010-11-05 | Photovoltaic charge-discharge control device with free capacity expansion |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355058A (en) * | 2011-09-28 | 2012-02-15 | 华北电网有限公司张家口供电公司 | Remote patrol system for unattended substation |
| CN112202228A (en) * | 2020-10-20 | 2021-01-08 | 深圳煜昇科技有限公司 | Double cell charge-discharge isolation power supply circuit |
-
2010
- 2010-11-05 CN CN2010205948277U patent/CN201839039U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355058A (en) * | 2011-09-28 | 2012-02-15 | 华北电网有限公司张家口供电公司 | Remote patrol system for unattended substation |
| CN112202228A (en) * | 2020-10-20 | 2021-01-08 | 深圳煜昇科技有限公司 | Double cell charge-discharge isolation power supply circuit |
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