CN113746072A - Intelligent high-voltage direct-current power distribution device - Google Patents
Intelligent high-voltage direct-current power distribution device Download PDFInfo
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- CN113746072A CN113746072A CN202111023597.8A CN202111023597A CN113746072A CN 113746072 A CN113746072 A CN 113746072A CN 202111023597 A CN202111023597 A CN 202111023597A CN 113746072 A CN113746072 A CN 113746072A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for dc systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
Abstract
The invention provides an intelligent high-voltage direct-current power distribution device, which comprises: the intelligent controller comprises a high-voltage input circuit, a high-voltage output circuit, a power supply circuit and an intelligent controller; the high-voltage input circuit comprises an input contactor, and the high-voltage output circuit comprises an output contactor and a pre-charging contactor; the intelligent controller controls the input contactor and the output contactor to be connected and collects current and voltage signals in a line, and controls the input contactor and the output contactor to be disconnected when the ratio of the actual current to the maximum rated steady-state current in the line is judged to exceed a first preset threshold value; the intelligent controller controls the pre-charging contactor to be connected and collects current and voltage signals of the high-voltage output circuit, and when the ratio of the voltage of the output end of the high-voltage output circuit to the voltage of the input end of the high-voltage output circuit exceeds a second preset threshold value, the intelligent controller controls the output contactor to be connected and simultaneously disconnects the pre-charging contactor. The invention introduces two monitoring mechanisms with preset threshold values into the intelligent controller, expands the power distribution range on the premise of ensuring safety, and simultaneously improves the power distribution efficiency.
Description
Technical Field
The invention relates to the technical field of power distribution control, in particular to an intelligent high-voltage direct-current power distribution device.
Background
At present, a high-voltage power supply is widely applied to various aspects, and the high-voltage power supply is adopted to supply power to high-power equipment, so that the weight and the cost of a system can be greatly reduced.
However, although the current high-voltage distribution device has an overcurrent and overvoltage protection mechanism, once the voltage or current in the line exceeds the maximum rated steady-state voltage or current, the power is cut off, and the distribution range of the voltage and the current is to be improved; in the pre-charging circuit, the voltage of the rear-end load is required to completely reach the pre-stage power supply voltage to disconnect the pre-charging circuit and simultaneously start the main circuit, so that the power distribution efficiency is to be improved.
Disclosure of Invention
In response to at least one of the deficiencies or needs in the art, the present invention provides an intelligent high voltage dc power distribution apparatus.
The invention provides an intelligent high-voltage direct-current power distribution device, which comprises: the intelligent controller comprises a high-voltage input circuit, a high-voltage output circuit, a power supply circuit and an intelligent controller;
the high-voltage input circuit inputs external high voltage and outputs the external high voltage through the high-voltage output circuit;
the high-voltage input circuit comprises an input contactor, and the high-voltage output circuit comprises an output contactor and a pre-charging contactor;
the intelligent controller controls the input contactor to be connected and collects current and voltage signals of the high-voltage input circuit, and controls the input contactor to be disconnected when the ratio of the actual current passing through the high-voltage input circuit to the maximum rated steady-state current is judged to exceed a first preset threshold value;
the intelligent controller controls the pre-charging contactor to be switched on and collects current and voltage signals of the high-voltage output circuit, and controls the output contactor to be switched on and simultaneously switches off the pre-charging contactor when the ratio of the voltage of the output end of the high-voltage output circuit to the voltage of the input end of the high-voltage output circuit exceeds a second preset threshold value; when the ratio of the actual current passing through the high-voltage output circuit to the maximum rated steady-state current is judged to exceed the first preset threshold value, controlling the output contactor to be switched off;
the power supply circuit performs voltage reduction on the output voltage of the high-voltage output circuit and supplies power to the intelligent controller, the high-voltage input circuit and the high-voltage output circuit.
According to the intelligent high-voltage direct-current power distribution device provided by the invention, the intelligent controller comprises a processor, and the chip model of the processor is TMS320F 28335.
According to the intelligent high-voltage direct-current power distribution device provided by the invention, the intelligent controller further comprises a storage circuit and a CAN isolation receiving and transmitting circuit, the intelligent controller receives a CAN communication instruction of an upper computer through the CAN isolation receiving and transmitting circuit to carry out power distribution and power failure operation, and the acquired information is uploaded to the upper computer; and the intelligent controller stores information through the storage circuit.
According to the intelligent high-voltage direct-current power distribution device provided by the invention, the contact pre-charging time of the pre-charging contactor is not more than 3 seconds.
According to the intelligent high-voltage direct-current power distribution device provided by the invention, the first preset threshold value is 120%, and the second preset threshold value is 90%.
According to the intelligent high-voltage direct-current power distribution device provided by the invention, the high-voltage input circuit and the high-voltage output circuit respectively comprise a voltage sensor and a current sensor.
According to the intelligent high-voltage direct-current power distribution device provided by the invention, the high-voltage input circuit further comprises a direct-current leakage sensor which is used for monitoring the leakage condition of the intelligent high-voltage direct-current power distribution device.
According to the intelligent high-voltage direct-current power distribution device provided by the invention, the high-voltage output circuit further comprises a soft start resistor connected with the pre-charging contactor in series, and the resistance value of the soft start resistor is 300 omega.
According to the intelligent high-voltage direct-current power distribution device provided by the invention, the intelligent controller further comprises an analog quantity acquisition circuit, and the analog quantity acquisition circuit comprises a sensor, a voltage follower, an analog switch and an ADC (analog-to-digital converter) module which is arranged in the processor.
According to the intelligent high-voltage direct-current power distribution device provided by the invention, the input end of the high-voltage input circuit also comprises a single-pole double-throw switch.
The intelligent high-voltage direct-current power distribution device provided by the invention has the beneficial effects that:
1) the intelligent controller of the power distribution device is provided with two monitoring and control mechanisms with preset threshold values in a matched mode, so that the power distribution range is expanded on the premise of ensuring safety, and meanwhile, the power distribution efficiency is improved.
2) The intelligent controller is matched with the design of the power distribution device to collect line voltage and current data and judge and control the line voltage and current data, so that the intelligent control of the high-voltage power distribution device is realized, excessive manual intervention is not needed, and the operation is simple; meanwhile, the power distribution device can feed back and store relevant information, and data can be traced.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following will briefly introduce some drawings needed to be used in the description of the embodiments or the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an intelligent high-voltage direct-current power distribution device of the invention;
FIG. 2 is a schematic diagram of the intelligent controller of the present invention;
FIG. 3 is a circuit schematic of the analog acquisition circuit of the present invention;
FIG. 4 is a circuit schematic of the high voltage input circuit of the present invention;
fig. 5 is a circuit schematic of the high voltage output circuit of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention provides an intelligent high-voltage dc power distribution apparatus, comprising: the intelligent controller comprises a high-voltage input circuit, a high-voltage output circuit, a power supply circuit and an intelligent controller;
the high-voltage input circuit inputs external high voltage and outputs the external high voltage through the high-voltage output circuit; an external capacitive load may be powered.
The high-voltage input circuit comprises an input contactor, and the high-voltage output circuit comprises an output contactor and a pre-charging contactor; the high-voltage input circuit and the high-voltage output circuit are connected and disconnected through the contactor.
The intelligent controller controls the input contactor to be connected and collects current and voltage signals of the high-voltage input circuit, and controls the input contactor to be disconnected when the ratio of the actual current passing through the high-voltage input circuit to the maximum rated steady-state current is judged to exceed a first preset threshold value.
After the circuit is switched on, the current and the voltage of the circuit reach a steady state after a certain time, and when higher voltage is input to the circuit, the voltage and the current of the circuit are continuously increased until a limit value is reached, namely the maximum rated steady-state current or voltage value. Conventional over-voltage over-current protection mechanisms can cause the circuit to open when the maximum rated steady-state current is reached, thereby protecting the safety of circuit equipment and operators. However, experiments prove that when the maximum rated steady-state current or voltage value in the circuit is slightly exceeded, the safety of equipment or an operator is not influenced. The electrical related performance parameters have a nominal value and a maximum value, and the electrical appliance preferably operates within a range not exceeding the nominal value, but does not represent that it cannot withstand larger parameter values. Based on the consideration, the invention specially designs a monitoring mechanism related to a first preset threshold value for the intelligent controller, and when the ratio of the actual current of the circuit to the maximum rated steady-state current exceeds the first preset threshold value, the input contactor is controlled to be disconnected, so that the power distribution adaptation range of the power distribution equipment is expanded, and the power distribution equipment can perform power distribution operation in a wider voltage range.
The intelligent controller controls the pre-charging contactor to be connected and collects current and voltage signals of the high-voltage output circuit, and controls the output contactor to be connected and simultaneously disconnects the pre-charging contactor when the ratio of the voltage of the output end of the high-voltage output circuit to the voltage of the input end of the high-voltage output circuit exceeds a second preset threshold value; and when the ratio of the actual current passing through the high-voltage output circuit to the maximum rated steady-state current is judged to exceed a first preset threshold value, controlling the output contactor to be switched off.
In the conventional precharging mechanism, when the voltage of the capacitive load terminal reaches a level substantially equal to the voltage of the preceding input terminal, the precharging process of the circuit is ended and the main control loop is turned on at the same time. However, according to the results of many experiments, the pre-charging process can be ended when the voltage of the capacitive load at the output end does not need to completely reach the previous input voltage value, and the impact of the large current on the power distribution device is within an acceptable range. In view of this, the present invention specifically designs a monitoring mechanism related to a second preset threshold value for the intelligent controller, and when the voltage of the capacitive load end of the output end is relatively close to the previous stage input voltage value, the pre-charging process is cut off and the main loop is opened at the same time. Therefore, the pre-charging time is shortened, and the power distribution efficiency is improved.
The power supply circuit performs voltage reduction processing on the output voltage of the high-voltage output circuit and supplies power to the intelligent controller, the high-voltage input circuit and the high-voltage output circuit. The power supply circuit converts the high-voltage direct current into 28V or +/-15V direct current through LC filtering, ZVS full-bridge high-frequency chopping, full-bridge rectification and LC filtering, and the direct current is used by an intelligent controller, a high-voltage input circuit and a high-voltage output circuit. In order to ensure the working safety of the control circuit, the power supply circuit is also provided with functional modules for input under-voltage protection, input overvoltage protection, over-temperature protection, output overvoltage protection, output overcurrent protection, output short-circuit protection and the like.
The intelligent controller comprises a processor, and preferably, the chip model of the processor is TMS320F 28335.
Preferably, the intelligent controller further comprises a storage circuit and a CAN isolation transceiver circuit, and the intelligent controller receives a CAN communication instruction of the upper computer through the CAN isolation transceiver circuit to perform power distribution and power failure operations and uploads the acquired information to the upper computer; the intelligent controller stores information through the storage circuit.
Preferably, the intelligent controller further comprises an analog quantity acquisition circuit, and the analog quantity acquisition circuit comprises a sensor, a voltage follower, an analog switch and an ADC analog-to-digital conversion module arranged in the processor.
As shown in fig. 2, the intelligent controller mainly comprises a processor, a power supply circuit, a reset circuit, a storage circuit, a CAN isolation transceiver circuit, an analog quantity acquisition circuit, a switching value output circuit, and the like.
In one embodiment, the processor is preferably a TMS320F28335 chip, the chip is based on CMOS technology, the dominant frequency CAN reach 150MHz, has high performance 32-bit CPU and harvard bus architecture, 256KB flash memory and 68KB RAM, meets the processing requirements of the power distribution device, and has external interfaces such as 16 channels, 12-bit a/D, 2-way CAN, 1-way 16-bit/32-bit external storage bus, and the like.
The storage circuit adopts a FLASH with the capacity of 32M, can store information such as voltage, current, leakage current, working state and the like collected by a processor, can store not less than 1000 pieces of fault information, and automatically covers the earliest data by the latest data after the number of the fault information exceeds 1000.
The CAN isolation transceiver circuit adopts an isolation transceiver integrated mode, is realized by a transceiver ISO1050DUB with isolation, and adds a matching resistor on a bus.
The power supply circuit is preferably realized by a chip LPS70302, the input voltage range of the chip is 2.7V-6V, the output voltage range is 1.22V-5.5V, the two paths of outputs are independent, wherein VOUT1 outputs rated current of 1A, VOUT2 outputs rated current of 2A, and the power supply is matched with 1.9V and 3.3V power supplies required by the operation of a processor.
The reset circuit is preferably realized by adopting a chip SM708S, the chip is suitable for 5V and 3V power supply systems, the typical reset threshold voltage is 2.93V, the reset delay time is 200ms, the reset requirement of the processor is met, and meanwhile, the circuit also realizes the power-on reset function of the externally-extended FLASH.
As shown in fig. 3, the sensor output voltage range is 0V to 5V, and the voltage signal AD8 passes through the voltage follower formed by the N20 single operational amplifier FXOP37A, then the voltage range is reduced to be less than 3V by adopting the differential amplification circuit, and then the voltage signal enters the processor through the voltage follower formed by the N21 double operational amplifiers FX 082. The processor is internally provided with a 12-bit ADC analog-to-digital conversion module which comprises 16 input channels, the conversion rate can reach 12.5MBPS, and the sampling range is 0V-3V.
The switching value output circuit is realized by adopting a relay, the relay is provided with 4 groups of normally open contacts, the load is 4A, the input working voltage is 5V, and the voltage of the output end can reach 60V.
The contact pre-charging time of the pre-charging contactor may be satisfied to be not more than 3 seconds. The pre-charging time of the traditional scheme is generally more than 5 seconds, and the invention can ensure that the pre-charging time can meet the requirement of not more than 3 seconds through the overall design of the circuit and the setting of a chip selection and monitoring mechanism of the intelligent controller, thereby improving the power distribution efficiency.
The first preset threshold is preferably set to 120% and the second preset threshold is preferably set to 90%. Based on the results of a number of experiments: when the first preset threshold is set to be 120%, the requirement of circuit safety can be met, when the ratio of the actual current to the maximum rated steady-state current exceeds 120%, the circuit safety is reduced, and when the ratio of the actual current to the maximum rated steady-state current is lower than 120%, the circuit safety can be guaranteed, namely 120% is a relatively proper upper limit value of the ratio; the second preset threshold is set to 90%, when the voltage of the rear end capacitive load terminal reaches 90% or more of the front stage input voltage, the power distribution device can completely bear the impact of the large current, and when the second preset threshold is less than 90%, the power distribution device cannot completely bear the impact of the large current, so that the circuit can be damaged to a certain degree, and the safety of an operator is threatened to a certain extent, namely 90% is a lower limit value of a proper proportion.
Preferably, the high voltage input circuit and the high voltage output circuit each include a voltage sensor and a current sensor.
Preferably, the high-voltage input circuit further comprises a direct current leakage sensor for monitoring the leakage condition of the intelligent high-voltage direct current power distribution device.
Preferably, the input terminal of the high-voltage input circuit further comprises a single-pole double-throw switch.
As shown in fig. 4, the high-voltage input circuit is configured by input contactors KMA and KMB, a selection switch S1, a dc leakage sensor TA1, a voltage sensor TV0, and a current sensor TA 0. When the S1 is arranged at the position 3, the input contactor KMA is attracted, and the high-voltage input 1 connected with the KMA is connected to the power distribution device; when the S1 is arranged at the position 1, the input contactor KMB is attracted, and the high-voltage input 2 connected with the KMB is connected to the power distribution device; direct current leakage sensor TA1 detects the difference of high voltage output A electric current, and this current value is sampled to the intelligent control ware, and when the leakage current exceeded the settlement safe value, the intelligent control ware control input contactor KMA, KMB disconnection, protection operator's safety. The voltage sensor TV0 detects the voltage of the high-voltage output A, the current sensor TA0 detects the current of the high-voltage output A, and when the voltage or the current of the high-voltage output A exceeds a set value, the intelligent controller controls the input contactors KMA and KMB to be disconnected, so that the safety of equipment is protected. The input contactors KMA and KMB are high-voltage-resistant contactors with rated voltage of 800V and rated current of 600A, the rated voltage of a coil of 28V and the maximum starting current of 3.5A. The voltage sensor TV0, the current sensor TA0 and the leakage sensor TA1 are powered by +/-15V, and the voltage sensor TV0 linearly converts high-voltage direct-current voltage of 0-1000V into direct current of 0-4V; the current sensor TA0 converts the 0-300A current into 0-150 mA current, which is convenient for the collection of the processor. The rated measurement range of the leakage sensor is 0-50 mA.
Preferably, the high-voltage output circuit further comprises a soft start resistor connected in series with the pre-charging contactor, and the resistance value of the soft start resistor is 300 Ω.
As shown in fig. 5, high pressureThe output circuit is composed of an output contactor KM1, a pre-charging contactor KM2, a current limiting resistor RY1, a fuse F1, a voltage sensor TV1 and a current sensor TA 2. Because the load is capacitive and the impact current is very large during electrification, the intelligent controller firstly controls the pre-charging contactor KM2 to attract during electrification, the high-voltage direct current charges the capacitive load after being limited by the RY1 resistor, the voltage sensor TV1 detects the voltage of the high-voltage output B, and when the ratio of the voltage of the high-voltage output B to the voltage of the high-voltage input A exceeds 0.9, the intelligent controller controls the KM1 to attract and simultaneously disconnects the KM 2. The pre-charging circuit prevents the power distribution device from being impacted by large current. The voltage sensor TV1 and the current sensor TA2 monitor the voltage and the current of the high-voltage output B and transmit the voltage and the current to the intelligent controller. The soft start resistor RY1 adopts a radiator to mount a glass glaze film to fix the resistor, the resistance value is 300 omega, the rated power is 50W, the maximum voltage is 800V, and the working temperature range is-55-275 ℃. The precharge time is 3 τ 3RC 3 × 300 × 1000 × 10－6The pre-charging time meets the requirement of not more than 3s (the capacitance of the back-end circuit is set to be 1000 uF).
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. An intelligent high voltage dc power distribution unit, comprising: the intelligent controller comprises a high-voltage input circuit, a high-voltage output circuit, a power supply circuit and an intelligent controller;
the high-voltage input circuit inputs external high voltage and outputs the external high voltage through the high-voltage output circuit;
the high-voltage input circuit comprises an input contactor, and the high-voltage output circuit comprises an output contactor and a pre-charging contactor;
the intelligent controller controls the input contactor to be connected and collects current and voltage signals of the high-voltage input circuit, and controls the input contactor to be disconnected when the ratio of the actual current passing through the high-voltage input circuit to the maximum rated steady-state current is judged to exceed a first preset threshold value;
the intelligent controller controls the pre-charging contactor to be switched on and collects current and voltage signals of the high-voltage output circuit, and controls the output contactor to be switched on and simultaneously switches off the pre-charging contactor when the ratio of the voltage of the output end of the high-voltage output circuit to the voltage of the input end of the high-voltage output circuit exceeds a second preset threshold value; when the ratio of the actual current passing through the high-voltage output circuit to the maximum rated steady-state current is judged to exceed the first preset threshold value, controlling the output contactor to be switched off;
the power supply circuit performs voltage reduction on the output voltage of the high-voltage output circuit and supplies power to the intelligent controller, the high-voltage input circuit and the high-voltage output circuit.
2. The intelligent high-voltage direct current distribution device according to claim 1, wherein the intelligent controller comprises a processor, and the chip model of the processor is TMS320F 28335.
3. The intelligent high-voltage direct-current distribution device according to claim 2, wherein the intelligent controller further comprises a storage circuit and a CAN isolation transceiver circuit, the intelligent controller receives CAN communication instructions of an upper computer through the CAN isolation transceiver circuit to perform distribution and power failure operations, and uploads collected information to the upper computer; and the intelligent controller stores information through the storage circuit.
4. The intelligent high-voltage direct current distribution device of claim 1, wherein the contact precharge time of the precharge contactor is no greater than 3 seconds.
5. The intelligent high-voltage direct current power distribution apparatus according to claim 1, wherein the first preset threshold is 120% and the second preset threshold is 90%.
6. The intelligent high voltage dc power distribution apparatus of claim 1 wherein the high voltage input circuit and the high voltage output circuit each comprise a voltage sensor and a current sensor.
7. The intelligent high voltage dc power distribution unit of claim 1 wherein the high voltage input circuit further comprises a dc leakage sensor for monitoring leakage of the intelligent high voltage dc power distribution unit.
8. The intelligent high-voltage direct-current distribution device according to claim 1, wherein the high-voltage output circuit further comprises a soft start resistor connected in series with the pre-charging contactor, and the resistance value of the soft start resistor is 300 Ω.
9. The intelligent high-voltage direct current distribution device according to claim 3, wherein the intelligent controller further comprises an analog quantity acquisition circuit, and the analog quantity acquisition circuit comprises a sensor, a voltage follower, an analog switch and an ADC analog-to-digital conversion module built in the processor.
10. The intelligent high voltage dc power distribution unit of claim 1 wherein the input of the high voltage input circuit further comprises a single pole double throw switch.
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| CN106483900A (en) * | 2016-10-21 | 2017-03-08 | 湖北三江航天万峰科技发展有限公司 | A kind of multiple protector being applied to high tension direct current generator group |
| CN106696713A (en) * | 2016-11-30 | 2017-05-24 | 河南森源重工有限公司 | Control circuit and control method of high pressure precharging of electric vehicle |
| CN111371082A (en) * | 2018-12-26 | 2020-07-03 | 广州汽车集团股份有限公司 | High-voltage direct-current bus energy control system and method and automobile |
| CN212518382U (en) * | 2020-07-30 | 2021-02-09 | 湖北三江航天万峰科技发展有限公司 | High-voltage direct-current leakage protection device |
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