CN114006426A - Large capacitive load pre-charging circuit and working method thereof - Google Patents
Large capacitive load pre-charging circuit and working method thereof Download PDFInfo
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- CN114006426A CN114006426A CN202111163143.0A CN202111163143A CN114006426A CN 114006426 A CN114006426 A CN 114006426A CN 202111163143 A CN202111163143 A CN 202111163143A CN 114006426 A CN114006426 A CN 114006426A
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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Abstract
The embodiment of the invention discloses a large capacitive load pre-charging circuit and a working method thereof, wherein the circuit comprises a control unit, a voltage conversion unit and a PWM pre-charging unit, wherein the voltage conversion unit and the PWM pre-charging unit are respectively connected with the control unit; the average value of the pre-charging current of the load and the peak value of the pre-charging current are limited by controlling the on-off of the pre-charging switch element and limiting the pre-charging current by the current limiting element through the control unit. By implementing the large capacitive load pre-charging circuit and the working method thereof, the large capacitive load can be pre-charged, the cost is low, the size is small, the pre-charging efficiency is improved, and the pre-charging effect is improved.
Description
Technical Field
The invention relates to the technical field of load pre-charging circuits, in particular to a large capacitive load pre-charging circuit and a working method thereof.
Background
The battery pack of the electric automobile is a main source of power and power supply of the whole automobile, and sometimes the rear-end electric equipment of the power battery is in various forms, but the equipment generally has the characteristic of equivalent capacitive load, the capacitance value is determined according to the equipment, and when the system is started, the power battery can further provide more current with larger electric quantity after the equivalent capacitive load of the rear-end electric equipment is fully charged by the power battery in advance; however, when the power battery starts to precharge the capacitive load, the voltage across the capacitor is substantially 0V, then this moment is equivalent to a battery short circuit, and if the capacitive load capacitance value exceeds 10000uF, the short circuit event is more easily triggered, so it is ensured that the larger capacitive load can be normally and effectively charged, i.e., the precharge time cannot be too long and is generally completed within 1-3S, and it is a basic requirement for the design of the BMS product that no short circuit or overcurrent event is triggered.
The existing pre-charging circuit basically adopts a pre-charging current-limiting resistor to perform current-limiting pre-charging, but the pre-charging current linearly decreases along with the increase of the voltage of a capacitive load, namely the pre-charging tail end current is smaller and smaller, even the possibility of non-full charging exists, the pre-charging efficiency is low, the effect is relatively poor, the volume is large, the power is high, and the cost is high.
Therefore, there is a need for a new circuit for pre-charging a large capacitive load, which is low in cost, small in size, and capable of improving pre-charging efficiency and pre-charging effect.
Disclosure of Invention
The invention aims to provide a large capacitive load pre-charging circuit and a working method thereof.
In order to solve the technical problems, the invention aims to realize the following technical scheme: the large capacitive load pre-charging circuit comprises a control unit, a voltage conversion unit and a PWM pre-charging unit, wherein the voltage conversion unit and the PWM pre-charging unit are respectively connected with the control unit, the voltage conversion unit and the PWM pre-charging unit are respectively connected with a load, the PWM pre-charging unit comprises a pre-charging switch element and a current-limiting element, the pre-charging switch element is connected with the current-limiting element, the current-limiting element is connected with the load, and the pre-charging switch element is connected with the control unit; the average value of the pre-charging current of the load and the peak value of the pre-charging current are limited by controlling the on-off of the pre-charging switch element and limiting the pre-charging current by the current limiting element through a control unit.
The further technical scheme is as follows: the pre-charge switching device includes a pre-charge MOS transistor Q1.
The further technical scheme is as follows: the current limiting element comprises a power inductor L1, the drain of the pre-charge MOS tube Q1 is connected with the power inductor L1, and the gate and the source of the pre-charge MOS tube Q1 are respectively connected with the control unit.
The further technical scheme is as follows: the output end pin of the control unit is further connected with a charge-discharge switch element, one end of the charge-discharge switch element is connected between the control unit and the source electrode of the pre-charging MOS tube Q1, and the other end of the charge-discharge switch element is connected with a load.
The further technical scheme is as follows: the charge and discharge switch element comprises a charge MOS tube and a discharge MOS tube.
The further technical scheme is as follows: the charge and discharge switching element includes a charge power relay and a discharge power relay.
The further technical scheme is as follows: a diode D2 is connected between the power inductor L1 and the load.
In addition, an object of the present invention is to provide a method for operating a large capacitive load precharge circuit, the method being applicable to the large capacitive load precharge circuit, and the method including:
the average value of the pre-charging current of the load and the peak value of the pre-charging current are limited by controlling the on-off of the pre-charging switch element and limiting the pre-charging current by the current limiting element through the control unit.
The further technical scheme is as follows: the controlling unit controls the on-off of the pre-charging switch element and the current limiting element limits the pre-charging current to realize the limitation of the average value of the pre-charging current and the peak value of the pre-charging current of the load, and the method comprises the following steps:
when the system is initially electrified or the charging and discharging switch element is disconnected, the pre-charging switch element is in a conducting state, and when the control unit detects that starting current exists, the pre-charging switch element is turned off;
the control unit outputs PWM pulse waves in real time through the voltage difference between the current voltage value of the load and the current voltage value of the battery pack so as to control the on or off of the pre-charging switching element and ensure that the average value of the pre-charging current of the load and the peak value of the pre-charging current are limited within a set range;
when the electric quantity of the load is charged to the set range value, the control unit controls the charging and discharging switch element to be conducted, and when the electric quantity of the load is fully charged, the control unit disconnects the pre-charging switch element.
The further technical scheme is as follows: when the electric quantity of the load is charged to the set range value, the control unit controls the charging and discharging switch element to be conducted, and when the electric quantity of the load is fully charged, the control unit disconnects the pre-charging switch element, and the method further comprises the following steps:
when the system is restarted after being powered off or a main loop fault exists in the working process, the charging and discharging switch element is disconnected, the pre-charging switch element is in a conducting state when the system is initially powered on or the charging and discharging switch element is disconnected, and the pre-charging switch element is turned off when the control unit detects that starting current exists.
Compared with the prior art, the invention has the beneficial effects that: the invention realizes the limitation of the average value of the pre-charging current and the peak value of the pre-charging current of the load by arranging the control unit, the voltage conversion unit and the PWM pre-charging unit and utilizing the quick on-off response function of the pre-charging switch element of the PWM pre-charging unit and the limiting function of the current limiting element on the current, thereby achieving the pre-charging of the capacitive load.
The invention is further described below with reference to the accompanying drawings and specific embodiments.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, 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 block diagram of a large capacitive load pre-charge circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a large capacitive load pre-charge circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a loop current waveform according to an embodiment of the present invention;
the labels in the figures illustrate:
10. a control unit; 20. a voltage conversion unit; 30. a PWM pre-charging unit; 40. and (4) loading.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. 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.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that 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 used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 1 is a schematic block diagram of a large capacitive load pre-charging circuit according to an embodiment of the present invention, which can be applied to a process of charging a load 40 by a battery pack of an electric vehicle to pre-charge a large capacitive load, and has the advantages of low cost, small size, improved pre-charging efficiency and improved pre-charging effect.
Referring to fig. 1, a large capacitive load pre-charge circuit includes a control unit 10, a voltage conversion unit 20 and a PWM pre-charge unit 30, wherein the voltage conversion unit 20 and the PWM pre-charge unit 30 are respectively connected to the control unit 10, the voltage conversion unit 20 and the PWM pre-charge unit 30 are respectively connected to a load 40, the PWM pre-charge unit 30 includes a pre-charge switch device and a current-limiting device, the pre-charge switch device is connected to the current-limiting device, the current-limiting device is connected to the load 40, and the pre-charge switch device is connected to the control unit 10; the average value of the pre-charge current and the peak value of the pre-charge current of the load 40 are limited by controlling the on-off of the pre-charge switch element and limiting the pre-charge current by the current limiting element through the control unit 10.
By utilizing the control on the PWM pre-charging unit 30, the fast on-off response function of the MOS tube and the blocking effect of the power inductor on the current are realized, the pre-charging current average value and the pre-charging current peak value of the load 40 are limited, the capacitive load 40 is pre-charged, the adopted devices are basic elements, the low-cost, small-size and high-efficiency large capacitive load pre-charging design solution is realized by using simple voltage sampling, a current detection circuit, a PWM pre-charging circuit and the like and using the inductor as a current blocking element, and the power MOS tube is used as a pre-charging loop switching device and combines the thought of PWM control.
In one embodiment, referring to fig. 2, the pre-charge switching device includes a pre-charge MOS transistor Q1.
In an embodiment, referring to fig. 2, the current limiting device includes a power inductor L1, the drain of the pre-charge MOS transistor Q1 is connected to the power inductor L1, and the gate and the source of the pre-charge MOS transistor Q1 are respectively connected to the control unit 10.
In the PWM pre-charging process, the controller detects a current voltage value Vc of the capacitive load 40 through the voltage conversion unit 20, detects a current voltage value Vb of the battery pack through the load 40, calculates a voltage difference value Vdif = Vb-Vc between Vb and Vc, and the control unit 10 dynamically outputs PWM pulse waveforms with different frequencies and different duty ratios in real time according to the voltage value Vdif to control on and off of the power pre-charging MOS Q1, and meanwhile, ensures that the peak current of the pre-charging in the process is controlled to Iprepk and the average current of the pre-charging is controlled to Ipreavg, because the peak current and the average current are not well controlled, the power inductor L1 and the pre-charging MOS Q1 may have a risk of damage due to an excessively large current or may not realize a normal pre-charging function due to an excessively small current; normally, the rear-end capacitive load 40 will be substantially linearly charged, but the voltage rising slope of the rear-end capacitive load 40 will be slightly reduced, and the basic idea is that when the voltage difference value Vdif is maximum, the PWM frequency is high, the high-level duty ratio is low, and as the voltage difference value Vdif is reduced, the PWM frequency will be lower, and the high-level duty ratio will be higher appropriately. If a real short circuit occurs in the PWM precharging process, that is, the voltage of the capacitive load 40 suddenly changes to 0V, or the precharging fault occurs, that is, the specified precharging time is exceeded, and the capacitive load 40 is not yet normally charged, the program immediately stops the PWM output, turns off the precharging MOS transistor Q1, and reports the precharging fault at the same time.
In an embodiment, referring to fig. 2, the output terminal pin of the control unit 10 is further connected to a charge/discharge switching element, one end of the charge/discharge switching element is connected between the control unit 10 and the source of the precharge MOS transistor Q1, and the other end of the charge/discharge switching element is connected to the load 40.
Specifically, the charge and discharge switching element comprises a charge MOS tube and a discharge MOS tube.
In another embodiment, the charge/discharge switching element includes a charge power relay and a discharge power relay.
In one embodiment, referring to fig. 2, a diode D2 is connected between the power inductor L1 and the load 40.
Specifically, the control unit 10 includes a control chip U1, a resistor R2, a diode D1 and a resistor R3 are connected between the OUTA pin of the control chip U1 and the VDD pin, and the VDD pin of the control chip U1 is grounded through a capacitor C3 and a capacitor C2, respectively.
In the present embodiment, the control unit 10 is further connected to a current collecting resistor R5 connected to the negative electrode of the battery pack.
In the present embodiment, the load 40 refers to a capacitive load 40, and one end of the capacitive load 40 is connected to the negative electrode of the battery pack, and the other end is connected to the positive electrode of the battery pack.
Specifically, the system is initially powered on or the charge and discharge switching element is turned off, the pre-charge MOS transistor Q1 is first in a conducting state, once the control unit 10 detects that the start-up current exceeding Istart is detected through the feedback network VISample, the pre-charge MOS transistor Q1 is turned off immediately, and then the program enters the PWM pre-charge logic; in the PWM pre-charging process, the controller detects a current voltage value Vc of the capacitive load 40 through the voltage conversion unit 20, detects a current voltage value Vb of the battery pack through the load 40, calculates a voltage difference value Vdif = Vb-Vc between Vb and Vc, and the control unit 10 dynamically outputs PWM pulse waveforms with different frequencies and different duty ratios in real time according to the voltage value Vdif to control on and off of the power pre-charging MOS Q1, and meanwhile, ensures that the peak current of the pre-charging in the process is controlled to Iprepk and the average current of the pre-charging is controlled to Ipreavg, because the peak current and the average current are not well controlled, the power inductor L1 and the pre-charging MOS Q1 may have a risk of damage due to an excessively large current or may not realize a normal pre-charging function due to an excessively small current; normally, the rear-end capacitive load 40 will be substantially linearly charged, but the voltage rising slope of the rear-end capacitive load 40 will be slightly reduced, and the basic idea is that when the voltage difference value Vdif is maximum, the PWM frequency is high, the high-level duty ratio is low, and as the voltage difference value Vdif is reduced, the PWM frequency will be lower, and the high-level duty ratio will be higher appropriately. If a real short circuit occurs in the PWM precharging process, that is, the voltage of the capacitive load 40 suddenly changes to 0V, or the precharging fault occurs, that is, the specified precharging time is exceeded, and the capacitive load 40 is not yet normally charged, the program immediately stops the PWM output, turns off the precharging MOS transistor Q1, and reports the precharging fault at the same time. When the capacitive load 40 is charged to more than 95% of the voltage of the battery pack, the charging and discharging switching element can be controlled to be switched on at the moment, and the occurrence of an overcurrent or short-circuit event of the main loop cannot be triggered, so that the rear-end capacitive load 40 can be completely filled, the system can normally work, and the pre-charging MOS tube Q1 is switched off at the moment; the charging and discharging switch element is firstly disconnected after the system is normally powered off and restarted or a main loop fault occurs in the working process, then the system is initially powered on or the charging and discharging switch element is disconnected, the pre-charging MOS tube Q1 is firstly in a conducting state, once the control unit 10 detects that the starting current exceeding Istart is detected through the feedback network VISample, the pre-charging MOS tube Q1 is immediately switched off, and then the program enters the PWM pre-charging logic.
For example: as shown in fig. 3, pre-charge for a 15000uF large capacitive load, where Iprepk is the peak current of the pre-charge; ipreavg is the average current of the precharge; the theoretically calculated pre-charge time Tpre = (capacitive load C × battery voltage U)/Ipreavg =15000uF 84V/1A = 1.26S; the correctness and feasibility of the theoretical design are verified according to actual circuit debugging, the pre-charging time of about 1.25S is basically consistent with the theoretically calculated voltage waveform of 1.26S according to the voltage waveform of the capacitive load of the actual pre-charging circuit, and the voltage waveform of the capacitive load is basically controlled to be linearly increased, so that a better pre-charging effect is ensured.
According to the large capacitive load pre-charging circuit, the control unit 10, the voltage conversion unit 20 and the PWM pre-charging unit 30 are arranged, the pre-charging current average value and the pre-charging current peak value of the load 40 are limited by the aid of the quick on-off response function of the pre-charging switch element of the PWM pre-charging unit 30 and the current limiting function of the current limiting element, and therefore pre-charging of the capacitive load 40 is achieved.
In an embodiment, there is also provided an operating method of a large capacitive load pre-charging circuit, the operating method is suitable for the large capacitive load pre-charging circuit, and the operating method includes:
the average value of the pre-charge current and the peak value of the pre-charge current of the load 40 are limited by controlling the on-off of the pre-charge switch element and limiting the pre-charge current by the current limiting element through the control unit 10.
Specifically, when the system is initially powered on or the charge-discharge switching element is turned off, the pre-charge switching element is in a conducting state, and when the control unit 10 detects that starting current exists, the pre-charge switching element is turned off;
the control unit 10 outputs a PWM pulse wave in real time through a voltage difference between a current voltage value of the load 40 and a current voltage value of the battery pack to control on or off of the precharge switching element, so as to ensure that a precharge current average value and a precharge current peak value of the load 40 are limited within a set range;
when the charge of the load 40 is charged to the set range value, the control unit 10 controls the charge/discharge switching element to be turned on, and when the charge of the load 40 is fully charged, the control unit 10 turns off the precharge switching element.
In addition, the control unit 10 controls the charging and discharging switching element to be turned on when the electric quantity of the load 40 is charged to the set range value, and after the control unit 10 turns off the pre-charging switching element when the electric quantity of the load 40 is fully charged, the method further includes:
when the system is restarted after power-off or a main loop fault occurs in the working process, the charge and discharge switch element is disconnected, the pre-charge switch element is in a conducting state when the system is initially powered on or the charge and discharge switch element is disconnected, and the pre-charge switch element is turned off when the control unit 10 detects that starting current exists.
It should be noted that, as can be clearly understood by those skilled in the art, a specific implementation process of the working method of the large capacitive load precharge circuit may refer to the corresponding description in the foregoing embodiment of the large capacitive load precharge circuit, and for convenience and brevity of description, no further description is provided herein.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A large capacitive load pre-charging circuit is characterized by comprising a control unit, a voltage conversion unit and a PWM pre-charging unit, wherein the voltage conversion unit and the PWM pre-charging unit are respectively connected with the control unit, the voltage conversion unit and the PWM pre-charging unit are respectively connected with a load, the PWM pre-charging unit comprises a pre-charging switch element and a current-limiting element, the pre-charging switch element is connected with the current-limiting element, the current-limiting element is connected with the load, and the pre-charging switch element is connected with the control unit; the average value of the pre-charging current of the load and the peak value of the pre-charging current are limited by controlling the on-off of the pre-charging switch element and limiting the pre-charging current by the current limiting element through a control unit.
2. The large capacitive load precharge circuit as claimed in claim 1, wherein said precharge switching element comprises a precharge MOS transistor Q1.
3. The large capacitive load pre-charging circuit as claimed in claim 2, wherein the current limiting element comprises a power inductor L1, the drain of the pre-charging MOS transistor Q1 is connected to the power inductor L1, and the gate and the source of the pre-charging MOS transistor Q1 are respectively connected to the control unit.
4. The large capacitive load pre-charging circuit according to claim 3, wherein a charge-discharge switch element is further connected to the output terminal pin of the control unit, one end of the charge-discharge switch element is connected between the control unit and the source of the pre-charging MOS transistor Q1, and the other end of the charge-discharge switch element is connected to a load.
5. The pre-charge circuit for large capacitive load according to claim 4, wherein the charge/discharge switching elements comprise a charge MOS transistor and a discharge MOS transistor.
6. The large capacitive load pre-charge circuit as claimed in claim 4, wherein said charge/discharge switching elements comprise a charge power relay and a discharge power relay.
7. The pre-charge circuit for large capacitive load as claimed in claim 3, wherein a diode D2 is connected between said power inductor L1 and said load.
8. A method for operating a large capacitive load pre-charge circuit, the method being applied to the large capacitive load pre-charge circuit as claimed in any one of claims 4 to 7, the method comprising:
the average value of the pre-charging current of the load and the peak value of the pre-charging current are limited by controlling the on-off of the pre-charging switch element and limiting the pre-charging current by the current limiting element through the control unit.
9. The operating method of the large capacitive load pre-charge circuit according to claim 8, wherein the controlling the on/off of the pre-charge switch element and the limiting the pre-charge current by the current limiting element to achieve the average value of the pre-charge current and the peak value of the pre-charge current for the load by the control unit comprises:
when the system is initially electrified or the charging and discharging switch element is disconnected, the pre-charging switch element is in a conducting state, and when the control unit detects that starting current exists, the pre-charging switch element is turned off;
the control unit outputs PWM pulse waves in real time through the voltage difference between the current voltage value of the load and the current voltage value of the battery pack so as to control the on or off of the pre-charging switching element and ensure that the average value of the pre-charging current of the load and the peak value of the pre-charging current are limited within a set range;
when the electric quantity of the load is charged to the set range value, the control unit controls the charging and discharging switch element to be conducted, and when the electric quantity of the load is fully charged, the control unit disconnects the pre-charging switch element.
10. The operating method of a large capacitive load pre-charge circuit as claimed in claim 9, wherein the controlling unit controls the charging/discharging switching device to be turned on when the charge level of the load is charged to the set range value, and further comprises the following steps after the controlling unit turns off the pre-charge switching device when the charge level of the load is fully charged:
when the system is restarted after being powered off or a main loop fault exists in the working process, the charging and discharging switch element is disconnected, the pre-charging switch element is in a conducting state when the system is initially powered on or the charging and discharging switch element is disconnected, and the pre-charging switch element is turned off when the control unit detects that starting current exists.
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| CN117200771A (en) * | 2023-09-14 | 2023-12-08 | 青岛鼎信通讯股份有限公司 | Power switch circuit applied to intelligent direct current metering and control equipment |
| CN117200771B (en) * | 2023-09-14 | 2024-06-07 | 青岛鼎信通讯股份有限公司 | Power switch circuit applied to intelligent direct current metering and control equipment |
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| CN110962679A (en) * | 2018-12-04 | 2020-04-07 | 宁德时代新能源科技股份有限公司 | Pre-charging circuit and pre-charging method |
| CN111293738A (en) * | 2018-12-10 | 2020-06-16 | 法雷奥动力总成(上海)有限公司 | Pre-charging control circuit and pre-charging control method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117200771A (en) * | 2023-09-14 | 2023-12-08 | 青岛鼎信通讯股份有限公司 | Power switch circuit applied to intelligent direct current metering and control equipment |
| CN117200771B (en) * | 2023-09-14 | 2024-06-07 | 青岛鼎信通讯股份有限公司 | Power switch circuit applied to intelligent direct current metering and control equipment |
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