CN214042055U - Auxiliary power supply switching control system and charging pile tester - Google Patents
Auxiliary power supply switching control system and charging pile tester Download PDFInfo
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- CN214042055U CN214042055U CN202022449367.5U CN202022449367U CN214042055U CN 214042055 U CN214042055 U CN 214042055U CN 202022449367 U CN202022449367 U CN 202022449367U CN 214042055 U CN214042055 U CN 214042055U
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Abstract
The utility model provides an auxiliary power supply switching control system, including DC power supply input, DC power supply output, power switching control system and control signal opto-coupler isolated system. The power supply switching control system comprises a relay and a first triode, wherein the relay comprises a coil, a common contact, a normally open contact and a normally closed contact; the normally closed contact is electrically connected with the input end of the direct current power supply; and the common contact is electrically connected with the output end of the direct current power supply. The control signal optical coupling isolation system comprises a controller, a second triode, a first optical coupler and a first battery, wherein the controller is used for sending a control signal to the second triode. Still provide the electric pile tester that fills including above-mentioned auxiliary power source switching control system. The utility model discloses an auxiliary power supply switching control system and fill electric pile tester can solve the power supply difficult problem that fills electric pile tester during operation, and does not influence the test work who fills electric pile, and control system and fill electric pile tester simple structure, safe and reliable.
Description
Technical Field
The utility model relates to a fill electric pile testing arrangement technical field, especially relate to an auxiliary power supply switching control system and fill electric pile tester.
Background
The electric automobile is the development direction of going out the instrument in future, and along with the vigorous development of electric automobile, electric automobile fills electric pile's effect and seems more and more important, and the country has been for this reason brought out fairly comprehensive detection standard, fills electric pile tester and also has come to bear or go with under this big background.
Fill electric pile or charging station and generally be in outdoor environment, fill electric pile tester and can receive a great deal of restriction when detecting, and wherein the most common problem is the power supply problem of filling the electric pile tester. Fill electric pile tester and generally adopt the adapter power supply, nevertheless because fill electric pile tester when testing charging pile, be in outdoor environment, its service environment is most likely can't provide commercial power input, and the battery that charges tester itself and carry on is under the condition of full charge, and the time that can the maintenance work is no longer than 3 hours at the longest. Even under the condition that the battery is full of electricity, this short time also can not accomplish the detection of whole electric pile system of filling, let alone under the battery is in not full of electricity the condition, this just brings very big inconvenience for our electric pile test work that fills.
The inventor finds that the inside of charging pile all is equipped with 12V/10A's auxiliary power supply, so, can get the electricity from the auxiliary power supply who fills electric pile, when for the work of charging the power supply of electric pile tester, also can charge the battery that fills electric pile tester. However, the auxiliary power supply of the charging pile is also to be tested, when the auxiliary power supply is tested, the charging pile tester cannot be powered, the auxiliary power supply is required to be disconnected from the charging pile tester at the moment, and meanwhile, the safety and the reliability of the auxiliary power supply are also required to be ensured, so that an auxiliary power supply switching control system is required to be designed to solve the problems.
Disclosure of Invention
For solving prior art's is not enough, the utility model provides an auxiliary power supply switching control system and fill electric pile tester can solve the problem that fills electric pile tester during operation power supply difficulty, and does not influence the test work who fills electric pile, and control system and fill electric pile tester simple structure, safe and reliable.
In order to achieve the above object, the utility model adopts the following technical scheme:
an auxiliary power supply switching control system comprises a direct-current power supply input end, a direct-current power supply output end, a power supply switching control system and a control signal optical coupler isolation system;
the negative electrode of the input end of the direct current power supply is grounded;
the power supply switching control system comprises a relay and a first triode, wherein the relay comprises a coil and contacts, and the contacts comprise a common contact, a normally open contact and a normally closed contact; the normally closed contact is electrically connected with the input end of the direct current power supply; the common contact is electrically connected with the output end of the direct current power supply; one end of the coil is electrically connected with the collector of the first triode, and the other end of the coil is electrically connected with the output end of the direct-current power supply; the emitting electrode of the first triode is grounded;
the control signal optical coupling isolation system comprises a controller, a second triode, a first optical coupler and a first battery, wherein the controller comprises a control signal output end, and the control signal output end is electrically connected with a base electrode of the second triode and used for sending a control signal to the second triode; a collector electrode of the second triode is electrically connected with a negative electrode of an emitting end of the first optocoupler, and an emitting electrode of the second triode is grounded; the emitting end anode of the first optocoupler is electrically connected with the first battery, the receiving end C electrode is electrically connected with the output end of the direct-current power supply, and the receiving end E electrode is electrically connected with the base electrode of the first triode.
The further improvement of the technical scheme is as follows:
the relay comprises two groups of the contacts; the first group of common contacts are electrically connected with the positive electrode of the output end of the direct-current power supply, and the first group of normally-closed contacts are electrically connected with the positive electrode of the input end of the direct-current power supply; the second group of common contacts is electrically connected with the negative electrode of the output end of the direct-current power supply, and the second group of normally-closed contacts is electrically connected with the negative electrode of the input end of the direct-current power supply.
A first diode is connected in series between the first normally closed contact and the anode of the power supply input end, and the cathode of the first diode is electrically connected with the anode of the direct current power supply input end; and two ends of a coil of the relay are connected with a second diode in parallel, and the cathode of the second diode is electrically connected with the anode of the output end of the direct-current power supply.
And the C pole of the receiving end of the first optocoupler is electrically connected with the positive pole of the output end of the direct-current power supply after being connected with a first resistor in series, and the positive pole of the transmitting end is electrically connected with the first battery after being connected with a second resistor in series.
And a first capacitor and a third resistor are respectively connected in parallel between the base electrode and the emitting electrode of the first triode.
A fourth resistor is connected in series between the control signal output end and the base electrode of the second triode, and a second capacitor and a fifth resistor are respectively connected in parallel between the base electrode and the emitting electrode of the second triode.
The auxiliary power supply switching control system also comprises a feedback signal optical coupling isolation system and a fault signal feedback system;
the feedback signal optical coupling isolation system comprises a chip, a second optical coupler and a second battery, wherein the chip comprises a feedback signal receiving end used for receiving a feedback signal sent by the second optical coupler; the fault signal feedback system also comprises a feedback signal output end which is used for sending a feedback signal to the fault signal feedback system; a receiving end C pole of the second optocoupler is electrically connected with the feedback signal receiving end, a receiving end E pole of the second optocoupler is grounded, and a positive pole and a negative pole of a transmitting end of the second optocoupler are respectively electrically connected with a first group of normally open contacts and a second group of normally open contacts of the relay;
the fault signal feedback system comprises a microprocessor, an exclusive-or logic chip and a third battery; the XOR logic chip comprises two receiving ports and an output port, the two receiving ports are respectively used for receiving a control signal sent by the control signal optical coupling isolation system and a feedback signal sent by the feedback signal optical coupling isolation system, comparing the two signals and transmitting a comparison result signal to the microprocessor through the output port; the microprocessor comprises a fault signal receiving end, and the microprocessor receives a comparison result signal sent by the XOR logic chip through the fault signal receiving end; the third battery supplies power to the fault signal feedback system.
A sixth resistor is connected in series between the second battery and the second optocoupler; a seventh resistor is connected in series between the feedback signal receiving end and the second optocoupler; and the positive electrode of the transmitting end of the second optocoupler is connected with an eighth resistor in series and then is electrically connected with the first group of normally open contacts of the relay.
And a transient suppression diode is connected in parallel between the C pole and the E pole of the receiving end of the second optocoupler.
The utility model also provides a fill electric pile tester, including foretell auxiliary power supply switching control system, the DC power supply input is connected with the auxiliary power supply electricity that electric pile was filled in awaiting measuring.
By the technical scheme of the utility model, the utility model provides an auxiliary power supply switching control system and fill electric pile tester will fill electric pile's auxiliary power supply as the power supply who fills electric pile tester during operation, whether switching over of control signal opto-coupler isolated system through the second triode fills electric pile auxiliary power supply and fills electric pile tester battery power supply, fills electric pile tester and can test other parts except that auxiliary power supply filling electric pile when filling electric pile auxiliary power supply, and the disconnection auxiliary power supply when changing into battery power supply, then can test filling electric pile auxiliary power supply. The first optical coupler can serve the purposes of electrical isolation and level conversion. This auxiliary power supply switches control system and fills electric pile tester simple structure, the maintenance of being convenient for, convenient to use, and safe and reliable has solved the power supply difficult problem that fills electric pile tester work.
Drawings
Fig. 1 is a circuit diagram of an auxiliary power supply switching control system according to embodiment 2 of the present invention.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
As shown in fig. 1, it is a circuit diagram of the auxiliary power supply switching control system of the present invention.
Example 1: the auxiliary power supply switching control system provided by this embodiment includes a dc power supply input terminal CN2, a dc power supply output terminal CN1, a power supply switching control system, and a control signal optical coupler isolation system.
The negative electrode of the direct current power supply input end CN2 is grounded.
The power supply switching control system comprises a relay RL1 and an NPN type first triode Q1. The relay RL1 includes a coil and two sets of contacts, each set of contacts including a common contact, a normally open contact and a normally closed contact. The first group of common contacts are electrically connected with the anode of the direct-current power supply output end CN1, a first diode D1 is connected in series between the first group of normally closed contacts and the anode of the direct-current power supply input end CN2, and the negative electrode K end of the first diode D1 is connected with the anode of the direct-current power supply input end CN 2; the second group of common contacts is electrically connected with the negative electrode of the direct-current power supply output end CN1, and the second group of normally-closed contacts is electrically connected with the negative electrode of the direct-current power supply input end CN 2. One end of the relay coil is electrically connected with the end C of the collector of the first triode Q1, and the other end of the relay coil is electrically connected with the positive electrode of the DC power supply output end CN 1; and a second diode D2 is connected in parallel at two ends of the coil, and the negative electrode K end of the second diode D2 is electrically connected with the positive electrode of the DC power output end CN 1. An emitter E end of the first triode Q1 is grounded, a first capacitor C1 and a third resistor R3 are respectively connected in parallel between a base B end and the emitter E end of the first triode Q1, and R3 is a pull-down resistor.
The control signal optical coupling isolation system comprises a controller, an NPN type second triode Q2, a first optical coupler OP1 and a first battery. The controller is an MCU (microprogrammed control unit) and comprises a control signal output end, the control signal output end is connected with a fourth resistor R4 in series and then is electrically connected with the base electrode B end of the second triode Q2, and the R4 is a 0603 type chip resistor; the controller MCU is used for sending a low level or high level signal to the second triode Q2. The collector C end of the second triode Q2 with the emission end negative pole K end electric connection of first opto-coupler OP1, the projecting pole E end ground connection of second triode Q2, second electric capacity C2 and fifth resistance R5 have parallelly connected respectively between the base B end of second triode Q2 and the projecting pole E end, and R5 is 0603 type pull-down resistance. The positive electrode A end of the transmitting end of the first optocoupler OP1 is connected with a second resistor R2 in series and then is electrically connected with the first battery, the voltage of the first battery is 3.3V, and the second resistor R2 is a 0603 type current-limiting resistor; a C pole at a receiving end of the first optocoupler OP1 is electrically connected with a positive pole of the DC power output end CN1 after being connected with a first resistor R1 in series, and the first resistor R1 is a 0603 type current-limiting resistor; and the receiving end E electrode of the first optocoupler OP1 is electrically connected with the base end B of the first triode Q1.
The working principle of the embodiment is as follows: when the control signal of the controller is at high level, the CE pole of the second triode Q2 is biased in forward direction, the AK end of the first optocoupler OP1 has current, the CE of the first optocoupler OP1 is biased in forward direction, and the U of the first triode Q1 is biased in forward directionbe>UonThe CE forward bias of Q1, there is the electric current in the relay RL1 coil, and the relay contact is switched to normally open contact by normally closed contact, and supply circuit switches on, fills electric pile auxiliary power and inputs power switching control system, can supply power to the tester that charges. When the control signal of the controller is low level, the CE of the second triode Q2 is cut off, the AK of the first optocoupler OP1 has no current, the CE of the first optocoupler OP1 is cut off, and the U of the first triode Q1 is cut offbeWhen the charging pile auxiliary power supply is disconnected, the relay coil is switched to a normally closed contact, the charging pile auxiliary power supply is disconnected and input, and the charging pile auxiliary power supply can be tested.
Example 2: the structure of the auxiliary power supply switching control system provided in this embodiment is basically the same as that of embodiment 1, except that this embodiment further includes a feedback signal optical coupling isolation system and a fault signal feedback system.
The feedback signal optical coupling isolation system comprises a chip, a second optical coupler OP2 and a second battery. The chip is an MCU and comprises a feedback signal receiving end for receiving a feedback signal sent by a second optical coupler OP 2; the fault signal feedback system also comprises a feedback signal output end which is used for sending a feedback signal to the fault signal feedback system. The feedback signal receiving end is connected with a seventh resistor R7 in series and then electrically connected with a receiving end C of the second optical coupler OP2, and the seventh resistor R7 is a 0603 type chip resistor. The E pole of the receiving end of the second optical coupler OP2 is grounded, the A end of the positive electrode of the transmitting end of the second optical coupler OP2 is connected with an eighth resistor R8 in series and then is electrically connected with a first group of normally open contacts of the relay RL1, and the R8 is a 0603 type chip resistor; and the negative electrode K end of the transmitting end of the second optocoupler OP2 is electrically connected with a second group of normally open contacts of the relay RL 1. A sixth resistor R6 is connected in series between the second battery and the second optocoupler OP2, R6 is a 0603 type pull-up resistor, and the voltage of the second battery is 3.3V. A transient suppression diode TVS1 is connected in parallel between a C pole and an E pole of a receiving end of the second optocoupler OP2 and used for protecting a circuit, so that the circuit is safer and more reliable.
The fault signal feedback system comprises a microprocessor, an exclusive-or logic chip U1 and a third battery. The exclusive-or logic chip U1 comprises two receiving ports A, B and an output port Y, wherein the two receiving ports A and B are respectively used for receiving a control signal sent by the control signal optical coupling isolation system and a feedback signal sent by the feedback signal optical coupling isolation system, comparing the two signals, and transmitting a comparison result signal to the microprocessor through the output port Y. One end of a circuit pin of the exclusive-or logic chip U1 is electrically connected with the anode of the third battery, the other end of the circuit pin is grounded, and the voltage of the third battery is 3.3V. The microprocessor is an MCU and comprises a fault signal receiving end, and the microprocessor receives the comparison result signal sent by the XOR logic chip through the fault signal receiving end.
The working principle of the embodiment is as follows: when a control signal of the controller is at a high level, the AK end of the second optical coupler OP2 is cut off, the CE end of the second optical coupler is cut off, a feedback signal is at a high level and is input to the chip, and at the moment, a fault signal feedback system receives signals of the control signal optical coupling isolation system and the feedback signal optical coupling isolation system which are both high level signals, which indicates that the charging pile auxiliary power supply is used as an input power supply. When the control signal of controller is low level, the AK of second opto-coupler OP2 has forward current, and its CE end forward bias, feedback signal are low level input to the chip, and fault signal feedback system received control signal opto-coupler isolation system and feedback signal opto-coupler isolation system's signal is low level signal this moment, shows to fill electric pile auxiliary power source and has disconnected the power supply, can fill electric pile auxiliary power source and test.
In this embodiment, a switching type power relay is used as the power switching device, and the switching type power relay has two sets of contacts: normally open contact and normally closed contact fill electric pile's auxiliary power source and connect relay common contact, and normally open contact is connected to DC power supply's input, and normally closed contact is as the feedback, can this input situation who judges auxiliary power supply.
The above is the normal working condition of the relay RL1, and because the relay occasionally fails, such as the coil of the relay is damaged or the contact is stuck, the probability of this condition is very small, but safety measures are also required to prevent the instrument and equipment from being damaged. At the moment, the feedback signal is different from that in normal operation, when the normally open contact of the relay is input, the current is larger, the bonding probability of the normally open contact is larger, the normally closed contact has a feedback function, the current is smaller, the bonding phenomenon occurs at a minimum probability, and the bonding phenomenon can be not considered. Assuming that the control signal is switched to a low level, in a normal operation condition, the feedback signal should also be at a low level, but if the relay is not switched to a normally closed contact due to contact adhesion, AK of the second optocoupler OP2 is still cut off, CE thereof is still cut off, and the feedback signal is still at a high level and is input to the chip. If the coil of the relay is damaged, if the control signal is switched to a high level, under the normal operation condition, the feedback signal should be the high level, but the contact of the relay is still in a normally closed contact because the coil is damaged and the contact does not act, so the AK of the second optocoupler OP2 has a forward current, the CE end of the second optocoupler is forward biased, and the feedback signal is a low level and is input to the chip.
The above two abnormal conditions may affect the normal use of the device, and the fault condition needs to be closely monitored, so the control signal and the feedback signal are further processed. The control signal and the feedback signal are connected to an exclusive-or logic chip U1, the output of U1 is a fault signal, and when the control signal and the feedback signal are both high level or low level, the output is low level, which indicates that the circuit operates normally; if the high and low levels of the two signals are different from each other, the U1 outputs a high level signal, which indicates that the RL1 is failed, and the relay needs to be repaired. The following table is a truth table and description for each signal.
| Working condition of relay | Control signal | Feedback signal | Fault signal |
| Normally closed contact | 0 | 0 | 0 |
| Normally |
1 | 1 | 0 |
| Contact bonding | 0 | 1 | 1 |
| |
1 | 0 | 1 |
According to the embodiment, the auxiliary power supply switching control system is monitored by setting the feedback signal optical coupling isolation system and the fault signal feedback system, so that the equipment is prevented from being damaged, and the safe operation of the equipment is guaranteed.
Example 3: the embodiment provides a charging pile tester, which comprises the auxiliary power supply switching control system in embodiment 1 or embodiment 2, wherein the direct-current power supply input end CN2 is electrically connected with an auxiliary power supply of a charging pile to be tested.
The utility model discloses an auxiliary power supply switching control system and fill electric pile tester can use the survey electric pile inside auxiliary power supply that fills as power supply at the during operation, both can satisfy the power supply demand of filling the electric pile tester in test work process, can charge for the battery that fills the electric pile tester again, make the battery guarantee full charge state, and can also examine time measuring cutting off at any time filling electric pile auxiliary power supply and be connected with auxiliary power supply, do not influence going on of test work. After a feedback signal optical coupling isolation system and a fault signal feedback system are added, whether the relay is damaged or not can be monitored, and equipment damage caused by relay damage is prevented.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only represent preferred embodiments of the present invention, which are described in more detail and detail, but are not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. An auxiliary power supply switching control system is characterized in that: the system comprises a direct-current power supply input end, a direct-current power supply output end, a power supply switching control system and a control signal optical coupler isolation system;
the negative electrode of the input end of the direct current power supply is grounded;
the power supply switching control system comprises a relay and a first triode, wherein the relay comprises a coil and contacts, and the contacts comprise a common contact, a normally open contact and a normally closed contact; the normally closed contact is electrically connected with the input end of the direct current power supply; the common contact is electrically connected with the output end of the direct current power supply; one end of the coil is electrically connected with the collector of the first triode, and the other end of the coil is electrically connected with the output end of the direct-current power supply; the emitting electrode of the first triode is grounded;
the control signal optical coupling isolation system comprises a controller, a second triode, a first optical coupler and a first battery, wherein the controller comprises a control signal output end, and the control signal output end is electrically connected with a base electrode of the second triode and used for sending a control signal to the second triode; a collector electrode of the second triode is electrically connected with a negative electrode of an emitting end of the first optocoupler, and an emitting electrode of the second triode is grounded; the emitting end anode of the first optocoupler is electrically connected with the first battery, the receiving end C electrode is electrically connected with the output end of the direct-current power supply, and the receiving end E electrode is electrically connected with the base electrode of the first triode.
2. The auxiliary power supply switching control system according to claim 1, wherein: the relay comprises two groups of the contacts; the first group of common contacts are electrically connected with the positive electrode of the output end of the direct-current power supply, and the first group of normally-closed contacts are electrically connected with the positive electrode of the input end of the direct-current power supply; the second group of common contacts is electrically connected with the negative electrode of the output end of the direct-current power supply, and the second group of normally-closed contacts is electrically connected with the negative electrode of the input end of the direct-current power supply.
3. The auxiliary power supply switching control system according to claim 2, wherein: a first diode is connected in series between the first group of normally closed contacts and the anode of the power supply input end, and the cathode of the first diode is electrically connected with the anode of the direct current power supply input end; and two ends of a coil of the relay are connected with a second diode in parallel, and the cathode of the second diode is electrically connected with the anode of the output end of the direct-current power supply.
4. The auxiliary power supply switching control system according to claim 1, wherein: and the C pole of the receiving end of the first optocoupler is electrically connected with the positive pole of the output end of the direct-current power supply after being connected with a first resistor in series, and the positive pole of the transmitting end is electrically connected with the first battery after being connected with a second resistor in series.
5. The auxiliary power supply switching control system according to claim 1, wherein: and a first capacitor and a third resistor are respectively connected in parallel between the base electrode and the emitting electrode of the first triode.
6. The auxiliary power supply switching control system according to claim 1, wherein: a fourth resistor is connected in series between the control signal output end and the base electrode of the second triode, and a second capacitor and a fifth resistor are respectively connected in parallel between the base electrode and the emitting electrode of the second triode.
7. The auxiliary power supply switching control system according to any one of claims 1 to 6, wherein: the auxiliary power supply switching control system also comprises a feedback signal optical coupling isolation system and a fault signal feedback system;
the feedback signal optical coupling isolation system comprises a chip, a second optical coupler and a second battery, wherein the chip comprises a feedback signal receiving end used for receiving a feedback signal sent by the second optical coupler; the fault signal feedback system also comprises a feedback signal output end which is used for sending a feedback signal to the fault signal feedback system; a receiving end C pole of the second optocoupler is electrically connected with the feedback signal receiving end, a receiving end E pole of the second optocoupler is grounded, and a positive pole and a negative pole of a transmitting end of the second optocoupler are respectively electrically connected with a first group of normally open contacts and a second group of normally open contacts of the relay;
the fault signal feedback system comprises a microprocessor, an exclusive-or logic chip and a third battery; the XOR logic chip comprises two receiving ports and an output port, the two receiving ports are respectively used for receiving a control signal sent by the control signal optical coupling isolation system and a feedback signal sent by the feedback signal optical coupling isolation system, comparing the two signals and transmitting a comparison result signal to the microprocessor through the output port; the microprocessor comprises a fault signal receiving end, and the microprocessor receives a comparison result signal sent by the XOR logic chip through the fault signal receiving end; the third battery supplies power to the fault signal feedback system.
8. The auxiliary power supply switching control system according to claim 7, wherein: a sixth resistor is connected in series between the second battery and the second optocoupler; a seventh resistor is connected in series between the feedback signal receiving end and the second optocoupler; and the positive electrode of the transmitting end of the second optocoupler is connected with an eighth resistor in series and then is electrically connected with the first group of normally open contacts of the relay.
9. The auxiliary power supply switching control system according to claim 7, wherein: and a transient suppression diode is connected in parallel between the C pole and the E pole of the receiving end of the second optocoupler.
10. The utility model provides a fill electric pile tester which characterized in that: the auxiliary power supply switching control system comprises the auxiliary power supply switching control system as claimed in any one of claims 1 to 9, wherein the direct current power supply input end is electrically connected with an auxiliary power supply of a charging pile to be tested.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022449367.5U CN214042055U (en) | 2020-10-29 | 2020-10-29 | Auxiliary power supply switching control system and charging pile tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022449367.5U CN214042055U (en) | 2020-10-29 | 2020-10-29 | Auxiliary power supply switching control system and charging pile tester |
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| CN214042055U true CN214042055U (en) | 2021-08-24 |
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| CN202022449367.5U Active CN214042055U (en) | 2020-10-29 | 2020-10-29 | Auxiliary power supply switching control system and charging pile tester |
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