CN114966187A - Commercial power voltage monitoring circuit and method and application in traffic signal machine - Google Patents
Commercial power voltage monitoring circuit and method and application in traffic signal machine Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R15/22—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using light-emitting devices, e.g. LED, optocouplers
Abstract
The invention provides a mains voltage monitoring circuit, a method and application in a traffic signal machine, wherein the mains voltage monitoring circuit comprises a strong current high-voltage input circuit, an optical coupler and a weak current low-voltage acquisition circuit; the strong-current high-voltage input circuit is used for connecting the mains supply input port to one side end of the optical coupler and forming a forward current loop between the mains supply input port and the optical coupler; the weak current low-voltage acquisition circuit is used for connecting the weak current input port to the other side end of the optical coupler and forming an acquisition current loop between the weak current input port and the optical coupler; and the weak current input port is connected to a circuit of the optical coupler and is provided with an AD acquisition node which is used for connecting a voltage acquisition element. The invention reduces the complexity of the alternating-current voltage acquisition circuit of the mains supply, thereby improving the accuracy of monitoring the mains supply voltage and reducing the related cost expenditure.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a mains voltage monitoring circuit and method and application in a traffic signal controller.
Background
With the rapid development of electronic circuit technology, the technology of collecting and monitoring the mains voltage is more and more mature; at present, the types of circuits for collecting and monitoring the mains voltage are various, but the design ideas fall into the following aspects: the high-voltage signal of the commercial power is converted into a low-voltage signal, and then the low-voltage signal is supplied to an AD collector for collection through a conditioning circuit, so that the commercial power voltage is reversely solved in real time.
Generally, a transformer is used for converting high voltage into low voltage, and then voltage acquisition and calculation are carried out through operation processing, so that the purpose of high-low voltage isolation is achieved, but certain errors are brought; and also increases the complexity of the PCB circuit, resulting in increased cost.
Therefore, how to provide a commercial power voltage monitoring circuit with a simple circuit structure, a method and an application in a traffic signal are problems that need to be solved by those skilled in the art.
Disclosure of Invention
In view of this, the present invention utilizes the photoelectric coupler to realize the collection and monitoring of the high voltage alternating current.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention discloses a mains voltage monitoring circuit, comprising: the system comprises a strong current high-voltage input circuit, an optical coupler and a weak current low-voltage acquisition circuit; wherein the content of the first and second substances,
the strong-current high-voltage input circuit is used for connecting a mains supply input port to one side end of the optical coupler and forming a forward current loop between the mains supply input port and the optical coupler;
the weak current low-voltage acquisition circuit is used for connecting a weak current input port to the other side end of the optical coupler and forming an acquisition current loop between the weak current input port and the optical coupler; and the weak current input port is connected to a circuit of the optical coupler and is provided with an AD acquisition node for connecting a voltage acquisition element.
Preferably, the live wire end of the mains supply input port passes through the resistor R 1 The zero line end of the commercial power input port is connected to a second interface of the first side end of the optical coupler; a second side of the optical couplerThe interface is connected to the anode of a diode, and the cathode of the diode is connected to a resistor R 1 And a connection node with the first interface.
Preferably, the current value range in the forward current loop is 1 mA-5 mA; resistance R 1 The resistance value range of (1) is 22K omega to 110K omega.
Preferably, the weak current input port is connected with a resistor R 2 A third interface connected to the other side end of the optical coupler, and a fourth interface at the other side end of the optical coupler is grounded; the AD acquisition node is arranged on the resistor R 2 And a connection node with the third interface.
Preferably, the current value range of the current collecting loop is 2 mA-2.5 mA; resistance R 2 The resistance value range of the resistor is 0.12K omega to 1.25K omega.
The invention discloses a mains voltage monitoring method, which is based on the following mains voltage monitoring circuit:
passing the mains supply input port through a resistor R 1 The zero line end of the commercial power input port is connected to a second interface of the first side end of the optical coupler; the second interface at one side end of the optical coupler is connected to the anode of a diode, and the cathode of the diode is connected to a resistor R 1 A forward current loop is formed between the mains supply input port and the optical coupler on a connection node of the first interface;
passing weak current input port through resistor R 2 A third interface connected to the other side end of the optical coupler, and a fourth interface at the other side end of the optical coupler is grounded; the AD acquisition node is arranged on a connection node of the resistor R2 and the third interface, and an acquisition current loop is formed between the weak current input port and the optical coupler; the weak current input port is connected to a circuit of the optical coupler, and an AD acquisition node is arranged on the circuit and used for connecting a voltage acquisition element;
the method comprises the following steps:
current transfer ratio CTR and ambient temperature T using optocoupler E Relation CTR = F (T) E ) Calculating the current monitoring environment temperature T by combining the following formula E Real-time mains supply input voltage U in ：
U in ={[(U cc -U ce )/R 2 ]/F(T E )}*R 1
Wherein, U cc For weak input voltage, U ce The voltage was collected for AD.
The invention discloses an application of the mains voltage monitoring method in a traffic signal machine, wherein the mains is the mains connected to the traffic signal machine, and the ambient temperature T E Is the working environment temperature of the traffic signal machine.
The invention discloses a method for monitoring the mains voltage input into a traffic signal machine according to the method for monitoring the mains voltage input into the traffic signal machine, which comprises the steps of obtaining the current transmission ratio CTR of an optical coupler and the ambient temperature T E Relation CTR = F (T) E ) The steps of (1):
according to the working environment temperature range of the traffic signal machine, test data of the mains supply voltage monitoring circuit under the working environment temperature of a plurality of groups of traffic signal machines are obtained, and the test data are substituted into the following formula to calculate the current transmission ratio CTR of the optical coupler under different working environment temperatures:
CTR=[U cc -U ce /R 2 ]/(U in /R 1 )；
constructing the current transfer ratio CTR of the optical coupler and the ambient temperature T of the traffic signal machine within the working ambient temperature range E Fitting relation of (CTR = F) (T) E )；
Using the fitting relation CTR = F (T) E ) Calculating the current monitoring environment temperature T E Real-time mains supply input voltage U in 。
Through the technical scheme, compared with the prior art, the invention has the beneficial effects that:
the invention realizes the collection and monitoring of high-voltage alternating current by using the photoelectric coupler, reduces the complexity of the alternating current voltage collection circuit of the commercial power, thereby improving the accuracy of monitoring the commercial power voltage, reducing the related cost expenditure, and simplifying the circuit structure and reducing the size of a PCB (printed circuit board). The rapid monitoring of the mains voltage input into the traffic signal machine can be realized by constructing the fitting relation between the current transmission ratio of the optical coupler in the temperature range of the working environment of the traffic signal machine and the ambient temperature of the traffic signal machine, and the applicability is higher.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts;
fig. 1 is a diagram of an overall logic architecture of a mains voltage monitoring circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a mains voltage monitoring circuit according to an embodiment of the present invention;
fig. 3 shows the current transfer ratio CTR and the ambient temperature T expressed in the specification of the optocoupler SPC according to the embodiment of the invention E A relationship graph;
FIG. 4 shows collector voltage U as described in the specification for optocoupler SPC provided in an embodiment of the invention ce And collector current I C A relationship graph;
fig. 5 shows the current transfer ratio CTR of the optical coupler and the ambient temperature T during the monitoring process of the mains voltage input to the traffic signal provided by the embodiment of the invention E And (5) fitting the test data to a curve relation graph.
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 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.
A first aspect of an embodiment of the present invention discloses a mains voltage monitoring circuit, which is shown in fig. 1 and includes: a strong current high voltage input circuit 101, an optical coupler 102 and a weak current low voltage acquisition circuit 103.
The specific circuit logic principle includes, as shown in fig. 2, a strong electric high voltage input circuit 101 for connecting a mains input port to one side end of an optical coupler 102 and forming a forward current loop between the mains input port and the optical coupler 102; the weak current low-voltage acquisition circuit 103 is used for connecting the weak current input port to the other side end of the optical coupler 102 and forming an acquisition current loop between the weak current input port and the optical coupler 102; and the weak current input port is connected to a circuit of the optical coupler 102 and is provided with an AD acquisition node for connecting a voltage acquisition element.
In one embodiment, the live line end of the mains input port passes through a resistor R 1 A first interface connected to one side end of the optical coupler 102, and a zero line end of the commercial power input port is connected to a second interface of one side end of the optical coupler 102; the second interface of one side of the optocoupler 102 is connected to the anode of a diode, the cathode of which is connected to a resistor R 1 And a connection node with the first interface.
In the embodiment, the value range of the current in the forward current loop is 1 mA-5 mA; resistance R 1 The resistance value range of (1) is 22K omega to 110K omega.
In one embodiment, the weak current input port is through a resistor R 2 A third interface connected to the other side of the optical coupler 102, and a fourth interface at the other side of the optical coupler 102 is grounded; the AD acquisition node is arranged on the resistor R 2 And a connection node with the third interface.
In the embodiment, the current value range of the acquisition current loop is 2 mA-2.5 mA; resistance R 2 The resistance value range of the resistor is 0.12K omega to 1.25K omega.
The right circuit in FIG. 2 is a strong current high voltage input circuit, which includes a commercial power input voltage U in A first resistor R 1 Diode D for reverse protection of optocoupler 1 Etc., the current (forward current) in the circuit is I F Then the following formula (1) exists:
I F =U in /R 1 （1）
the left circuit in fig. 2 is a weak current low voltage acquisition circuit, which comprises a weak current inputVoltage U cc A second resistor R 2 For AD acquisition of voltage (collector voltage) U ce The current (collector current) in the circuit is I C Then the following formula (2) exists:
I C =U cc -U ce /R 2 （2）
it should be noted that the optical coupler OC 1 The third interface at the other side can be equivalent to the collector of a triode, an optical coupler OC 1 The fourth interface of the other side end can be equivalent to the emitter of the triode.
The middle part of fig. 2 is an optical coupler OC 1 According to the current transfer ratio CTR characteristics in its SPC specification, the following formula (3) can be obtained:
CTR=(I C /I F )×100%（3）
according to an optical coupler OC 1 Current transfer ratio CTR and ambient temperature T in SPC specification E As shown in fig. 3, the following formula (4) is known:
CTR=F(T E )（4）
according to all the above formulas, formula (5) is integrated:
U in =I F* R 1 =(I C /CTR) * R 1 ={[(U cc -U ce )/R 2 ]/F(T E )}*R 1 （5）
in the formula of U cc 、U ce 、R 2 、T E 、R 1 All known or known, i.e. the real-time mains input voltage U can be determined in Therefore, the real-time acquisition and monitoring of the mains supply input voltage are realized.
The second aspect of the embodiment of the invention discloses a mains voltage monitoring method, which is based on the following mains voltage monitoring circuit disclosed by the first aspect of the embodiment:
passing the mains supply input port through a resistor R 1 A first interface connected to one side end of the optical coupler 102, and a zero line end of the commercial power input port is connected to a second interface of one side end of the optical coupler 102; the second interface of one side of the optocoupler 102 is connected to the anode of the diode, the cathode of the diodeIs connected to a resistor R 1 A forward current loop is formed between the mains supply input port and the optical coupler 102 at a connection node with the first interface;
passing weak current input port through resistor R 2 A third interface connected to the other side of the optical coupler 102, and a fourth interface at the other side of the optical coupler 102 is grounded; the AD acquisition node is arranged on the resistor R 2 A current collection loop is formed between the weak current input port and the optical coupler 102 on a connection node of the third interface; and the weak current input port is connected to a circuit of the optical coupler 102 and is provided with an AD acquisition node for connecting a voltage acquisition element.
The method comprises the following specific steps:
current transfer ratio CTR using optocoupler 102 and ambient temperature T E Relation CTR = F (T) E ) Calculating the current monitoring environment temperature T by combining the following formula E Real-time mains supply input voltage U in ：
U in ={[(U cc -U ce )/R 2 ]/F(T E )}*R 1
Wherein, U cc For weak current input voltage, U ce The voltage was collected for AD. Both may be given values or measured values.
In one embodiment, further comprising determining a resistance R 1 The method comprises the following specific steps:
to determine the resistance R 1 The resistance value of (1); because of the commercial power input voltage U in =220V ± 5%, according to optocoupler OC 1 Collector voltage U in SPC specification ce And collector current I C The relationship diagram, as seen in FIG. 4, shows that: at a collector voltage U which ensures good collection of the voltage collector MCU ce The general value range of (1) to (3) V; at the same time, the collector voltage U is ensured ce And collector current I C IF a good linear relation exists between the forward current IF and the forward current IF, the forward current IF ranges from 1mA to 5 mA; then, according to the formula (1), R can be known 1 =U in /I F Thus, the resistance R can be known 1 The resistance range of the resistor is 22K omega-110K omega; the present embodiment selects the resistor R 1 Is 100K omega, the forward current I F =U in /R 1 It takesThe value was 2.2 mA. + -. 5%.
In one embodiment, further comprising determining a resistance R 2 The method comprises the following specific steps:
to determine the resistance R 2 The resistance value of (1); since the rated voltage of the MCU for AD collecting voltage is 3.3V, the weak current input voltage U adopted in this embodiment is cc = 3.3V; due to the forward current I F The value of (2.2 mA) is +/-5%, and the collector voltage U ce The value range of (1) to (3) can be seen by referring to FIG. 4 C The value range of (A) is 2 mA-2.5 mA, and then R can be known according to a formula (2) 2 =U cc -U ce /I C And thus resistance R 2 The resistance value range of (1) is 0.12K omega to 1.25K omega, and the resistor R is selected in the embodiment 2 Is 0.2K omega.
A third aspect of an embodiment of the present invention further provides an application of the commercial power voltage monitoring method according to the embodiment of the second aspect in a traffic signal machine, wherein the commercial power is a commercial power accessed to the traffic signal machine, and the ambient temperature T is E Is the working environment temperature of the traffic signal machine. The remaining method steps and circuit configuration are the same as those described in the second aspect.
The fourth aspect of the embodiments of the present invention further provides a method for monitoring the mains voltage input to the traffic signal machine according to the method for monitoring the mains voltage described in the second aspect of the embodiments of the present invention, which further discloses obtaining the current transfer ratio CTR of the optical coupler 102 and the ambient temperature T on the basis of the embodiments of the second aspect of the present invention E Relation CTR = F (T) E ) The steps of (1):
according to the working environment temperature range of the traffic signal machine, test data of the mains voltage monitoring circuits under the working environment temperature of a plurality of groups of traffic signal machines are obtained, and the test data are substituted into the following formula to calculate the current transmission ratio CTR of the optical coupler 102 under different working environment temperatures:
CTR=[U cc -U ce /R 2 ]/(U in /R 1 )；
constructing the current transfer ratio CTR of the optical coupler 102 and the ambient temperature T of the traffic signal within the working ambient temperature range E Fitting relation of (CTR = F) (T) E )；
Using the fitting relation CTR = F (T) E ) Calculating the current monitoring environment temperature T E Real-time mains supply input voltage U in 。
When implemented in detail, the optocoupler OC is determined 1 Current transfer ratio CTR of and ambient temperature T E A specific functional relation; formula (6) can be obtained by integrating formula (1), formula (2), formula (3) and formula (4):
CTR=F(T E )=[U cc -U ce /R 2 ]/(U in /R 1 )（6）
a circuit is constructed according to FIG. 2, and the following parameter constants, such as U, are determined in combination with the above analysis cc =3.3V、R 2 =0.2KΩ、U in =220V、R 1 =100K Ω, and the test data can be obtained by establishing a relevant test according to the temperature range of-40 ℃ to 70 ℃ of the use environment of the annunciator, as shown in table 1,
TABLE 1 Current transfer ratio CTR of optocoupler versus ambient temperature T E Test data sheet
| Serial number | T E /℃ | U in /V | U cc /V | U ce /V | R 1 /Ω | R 2 /Ω | CTR/100% |
| 1 | -40 | 220 | 3.3 | 2.790 | 100000 | 200 | 1.159 |
| 2 | -30 | 220 | 3.3 | 2.713 | 100000 | 200 | 1.335 |
| 3 | -20 | 220 | 3.3 | 2.677 | 100000 | 200 | 1.415 |
| 4 | -10 | 220 | 3.3 | 2.679 | 100000 | 200 | 1.412 |
| 5 | 0 | 220 | 3.3 | 2.702 | 100000 | 200 | 1.359 |
| 6 | 10 | 220 | 3.3 | 2.741 | 100000 | 200 | 1.271 |
| 7 | 20 | 220 | 3.3 | 2.795 | 100000 | 200 | 1.148 |
| 8 | 30 | 220 | 3.3 | 2.835 | 100000 | 200 | 1.056 |
| 9 | 40 | 220 | 3.3 | 2.875 | 100000 | 200 | 0.967 |
| 10 | 50 | 220 | 3.3 | 2.902 | 100000 | 200 | 0.904 |
| 11 | 60 | 220 | 3.3 | 2.927 | 100000 | 200 | 0.848 |
| 12 | 70 | 220 | 3.3 | 2.946 | 100000 | 200 | 0.805 |
| 13 | 80 | 220 | 3.3 | 2.963 | 100000 | 200 | 0.766 |
By the current transfer ratio CTR and the ambient temperature T in Table 1 E The relationship curve is fitted to the values of (1), see fig. 5; the trend of the relationship curve in FIG. 5 is substantially identical to the trend of the relationship curve in FIG. 3, so that it can be known that the fitted relationship curve is suitable, i.e., the optical coupler OC can be obtained 1 Current transfer ratio CTR of and ambient temperature T E Specific function equation (7):
CTR=-2×10 -8 *T E 4 +3×10 -6 *T E 3 -2×10 -4 *T E 2 +7.9×10 -3 *T E +1.3515（7）
based on the test data, formula (5) and formula (7) are integrated to obtain real-time voltage U reflecting commercial power input in Formula (8):
{[(U cc -U ce )/R 2 ]/(-2×10 -8 *T E 4 +3×10 -6 *T E 3 -2×10 -4 *T E 2 +7.9×10 -3 *T E +1.3515)}*R 1 （8）
in the formula of U cc 、U ce 、R 2 、T E 、R 1 All known or known, i.e. the real-time mains input voltage U can be determined in Therefore, the real-time acquisition and monitoring of the mains supply input voltage are realized.
The above details of the mains voltage monitoring circuit and method and the application in the traffic signal provided by the present invention are described, a specific example is applied in this embodiment to explain the principle and the implementation of the present invention, and the description of the above embodiment is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined in this embodiment may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A mains voltage monitoring circuit, comprising: a strong-current high-voltage input circuit (101), an optical coupler (102) and a weak-current low-voltage acquisition circuit (103); wherein the content of the first and second substances,
the strong-current high-voltage input circuit (101) is used for connecting a mains supply input port into one side end of the optical coupler (102) and forming a forward current loop between the mains supply input port and the optical coupler (102);
the weak current low-voltage acquisition circuit (103) is used for connecting a weak current input port to the other side end of the optical coupler (102) and forming an acquisition current loop between the weak current input port and the optical coupler (102); and the weak current input port is connected to a circuit of the optical coupler (102) and is provided with an AD acquisition node for connecting a voltage acquisition element.
2. The mains voltage monitoring circuit according to claim 1, wherein a live line end of the mains input port passes through a resistor R 1 A first interface connected to one side end of the optical coupler (102), and a zero line end of the commercial power input port is connected to a second interface of one side end of the optical coupler (102); the second interface of one side end of the optical coupler (102) is connected to the anode of a diode, and the cathode of the diode is connected to the anode of the diodeResistance R 1 And a connection node with the first interface.
3. The mains voltage monitoring circuit according to claim 2, wherein the current in the forward current loop ranges from 1mA to 5 mA; resistance R 1 The resistance value range of (1) is 22K omega to 110K omega.
4. The mains voltage monitoring circuit of claim 1, wherein the weak current input port is connected through a resistor R 2 A third interface connected to the other side end of the optical coupler (102), and a fourth interface at the other side end of the optical coupler (102) is grounded; the AD acquisition node is arranged on the resistor R 2 And a connection node with the third interface.
5. The mains voltage monitoring circuit according to claim 4, wherein the current value range of the collecting current loop is 2 mA-2.5 mA; resistance R 2 The resistance value range of the resistor is 0.12K omega to 1.25K omega.
6. A mains voltage monitoring method is characterized by being based on a mains voltage monitoring circuit as follows:
passing the mains supply input port through a resistor R 1 A first interface connected to one side end of the optical coupler (102), and a zero line end of the commercial power input port is connected to a second interface of one side end of the optical coupler (102); a second interface of one side end of the optical coupler (102) is connected to the anode of a diode, and the cathode of the diode is connected to a resistor R 1 A forward current loop is formed between the mains input port and the optical coupler (102) on a connection node with the first interface;
passing weak current input port through resistor R 2 A third interface connected to the other side end of the optical coupler (102), and a fourth interface at the other side end of the optical coupler (102) is grounded; the AD acquisition node is arranged on the resistor R 2 At a connection node to the third interface, at the weak current input port anda current collecting loop is formed between the optical couplers (102); an AD acquisition node is arranged on a circuit of the weak current input port connected to the optical coupler (102) and is used for connecting a voltage acquisition element;
the method comprises the following steps:
the current transfer ratio CTR and the ambient temperature T using the optical coupler (102) E Relation CTR = F (T) E ) Calculating the current monitoring environment temperature T by combining the following formula E Real-time mains input voltage U in ：
U in ={[(U cc -U ce )/R 2 ]/F(T E )}*R 1
Wherein, U cc For weak current input voltage, U ce The voltage was collected for AD.
7. Use of the mains voltage monitoring method according to claim 6 in a traffic signal, wherein the mains is a mains power connected to the traffic signal, and the ambient temperature T is E Is the working environment temperature of the traffic signal machine.
8. The method for monitoring the commercial power voltage input to the traffic signal according to claim 6, wherein the method comprises obtaining the current transfer ratio CTR of the optical coupler (102) and the ambient temperature T E Relation CTR = F (T) E ) The steps of (1):
according to the working environment temperature range of the traffic signal machine, test data of the mains supply voltage monitoring circuit under the working environment temperature of a plurality of groups of traffic signal machines are obtained, and the test data are substituted into the following formula to calculate the current transmission ratio CTR of the optical coupler (102) under different working environment temperatures:
CTR=[U cc -U ce /R 2 ]/(U in /R 1 )；
constructing the current transfer ratio CTR of the optical coupler (102) and the ambient temperature T of the traffic signal machine within the working ambient temperature range E Fitting relation of (CTR = F) (T) E )；
By usingThe fitting relation CTR = F (T) E ) Calculating the current monitoring environment temperature T E Real-time mains supply input voltage U in 。
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| CN116909345A (en) * | 2023-09-12 | 2023-10-20 | 广东迅扬科技股份有限公司 | High-voltage control low-voltage power panel |
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| CN116909345B (en) * | 2023-09-12 | 2023-12-01 | 广东迅扬科技股份有限公司 | High-voltage control low-voltage power panel |
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Application publication date: 20220830 |