CN211206607U - Current detection device and electronic apparatus - Google Patents
Current detection device and electronic apparatus Download PDFInfo
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- CN211206607U CN211206607U CN201921391921.XU CN201921391921U CN211206607U CN 211206607 U CN211206607 U CN 211206607U CN 201921391921 U CN201921391921 U CN 201921391921U CN 211206607 U CN211206607 U CN 211206607U
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Abstract
The embodiment of the utility model provides a current detection device and electronic equipment, current detection device includes: the sampling unit is used for sampling the tested current and outputting a sampling signal; the control unit is coupled with the sampling unit and used for receiving the sampling signal so as to process the sampling signal; the voltage stabilizing unit is coupled with the sampling unit and used for receiving the sampling signal and stabilizing the voltage of the sampling unit so as to output a charging signal; and the power supply unit is coupled with the voltage stabilizing unit and the control unit and used for receiving the charging signal to charge energy, and the power supply unit is used for supplying power to the control unit. The electronic equipment comprises the current detection device. The utility model provides a current detection device and electronic equipment can acquire and is surveyed the electric current and carry out automatic charging, solves user manually operation's trouble.
Description
Technical Field
The utility model relates to an intelligence house field, concretely relates to current detection device and electronic equipment.
Background
In the smart home system, the power consumption current data of the smart home device is very important. The user can judge the type of the equipment according to the current, and can also cooperate with the gateway to carry out automatic control according to the power consumption of the equipment. The acquisition of current data is usually measured through the ampere meter, and ordinary digital ampere meter has extra power supply, needs to change the power when internal power source exhausts, and needs user manual operation when changing the battery, brings unnecessary trouble for the user.
SUMMERY OF THE UTILITY MODEL
In view of the above problem, the embodiment of the utility model provides a current detection device and electronic equipment can acquire to be surveyed the electric current and carry out automatic charging, solves user manual operation's trouble.
The embodiment of the utility model provides an adopt following technical scheme to realize:
a current detection device comprises a sampling unit, a current detection unit and a control unit, wherein the sampling unit is used for sampling a detected current and outputting a sampling signal; the control unit is coupled with the sampling unit and used for receiving the sampling signal so as to process the sampling signal; the voltage stabilizing unit is coupled with the sampling unit and used for receiving the sampling signal and stabilizing the voltage of the sampling unit so as to output a charging signal; and the power supply unit is coupled with the voltage stabilizing unit and the control unit and used for receiving the charging signal to charge energy, and the power supply unit is used for supplying power to the control unit.
In some embodiments, the current detection apparatus further includes a switch unit coupled between the sampling unit and the voltage stabilization unit, and the control unit is coupled to the switch unit, and the control unit is further configured to sample the voltage of the power supply unit, and when the voltage of the power supply unit reaches a predetermined voltage value, the control unit outputs a turn-off signal to the switch unit, so that the switch unit cuts off a coupling state of the sampling unit and the voltage stabilization unit.
In some embodiments, the current detection apparatus further includes a protection unit coupled between the switching unit and the power supply unit, and the protection unit is configured to output a cut-off signal to the switching unit when the voltage of the power supply unit reaches a reference voltage value, so that the switching unit cuts off a coupling state of the sampling unit and the voltage stabilization unit.
In some embodiments, the switching unit includes a field effect transistor, a gate of the field effect transistor is coupled to the control unit and the protection unit, a source of the field effect transistor is coupled to the sampling unit, and a drain of the field effect transistor is coupled to the voltage stabilization unit.
In some embodiments, the protection unit includes a voltage comparator, an inverting input terminal of the voltage comparator is preset with a reference voltage value, a non-inverting input terminal of the voltage comparator is coupled to the power supply unit, and an output terminal of the voltage comparator is coupled to the switching unit.
In some embodiments, the current detection apparatus further includes a switch unit coupled between the sampling unit and the voltage stabilization unit, and the control unit is coupled to the switch unit, and the control unit is further configured to output a turn-off signal to the switch unit when processing the sampling signal, so that the switch unit cuts off a coupling state of the sampling unit and the voltage stabilization unit.
In some embodiments, the current detection apparatus further includes a capacitor coupled between the voltage stabilization unit and the power supply unit.
In some embodiments, a first diode is coupled between the voltage stabilizing unit and the capacitor, and an anode of the first diode is coupled to the voltage stabilizing unit and a cathode of the first diode is coupled to the capacitor; a second diode is coupled between the capacitor and the power supply unit, and the anode of the second diode is coupled with the capacitor and the cathode of the second diode is coupled with the power supply unit.
In some embodiments, a third diode is coupled between the control unit and the power unit, and an anode of the third diode is coupled to the power unit and a cathode of the third diode is coupled to the control unit.
In some embodiments, the sampling unit comprises: the current transformer, be coupled in current transformer's sampling resistance and be coupled in the amplifier circuit of sampling resistance, the control unit is coupled in amplifier circuit, and the switch element is coupled in current transformer.
The embodiment of the utility model provides a still provide an electronic equipment, electronic equipment includes foretell current detection device.
Compared with the prior art, the embodiment of the utility model provides a current detection device and electronic equipment come the sampling measured current through the sampling unit to make the control unit handle sampling signal, and voltage after the sampling of sampling unit is stabilized to the steady voltage unit, and then the voltage output after will stabilizing is for power supply unit in order to charge to power supply unit, thereby realizes automatic charging, has solved the trouble of the manual change battery of user.
These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 shows a block diagram of a current detection apparatus according to an embodiment of the present invention.
Fig. 2 shows a schematic circuit diagram of the current detection device of fig. 1.
Fig. 3 shows a block diagram of another current detection apparatus according to an embodiment of the present invention.
Fig. 4 shows a schematic circuit diagram of another current detection device of fig. 3.
Fig. 5 shows a schematic structural diagram of an electronic device provided by an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
With the deep development of Internet (Internet) and Internet of things (IoT), smart homes (smart homes) are gradually used by more people, and as basic data, the power consumption of devices is an indispensable ring in smart home systems. The user can judge different power consumption types according to the magnitude of the current, and can also cooperate with the intelligent gateway to carry out automatic control according to the power consumption of the equipment. The traditional current data acquisition adopts contact acquisition, and usually, the circuit is cut off and then is connected into an ammeter or the insulating skin of a wire is peeled off and then is connected into the ammeter, so that the integrity of the circuit can be damaged in the traditional mode, and the measuring working procedure is very complicated. Therefore, the existing current data acquisition is changed into non-contact acquisition, the data of the measured current can be acquired without destroying the original line, and the method is very convenient and safe and has large detection range.
The existing digital ammeter is different from the traditional pointer type ammeter, the digital ammeter needs to be powered by a built-in power supply, the power supply needs to be replaced when the internal power supply is exhausted, manual operation of a user is needed when a battery is replaced, the ammeter is usually fixedly installed at a certain position to detect the power utilization current of equipment in an intelligent home system, and the installation position of the ammeter is a remote corner, so that the user is very troublesome in manually replacing the battery of the ammeter.
In order to solve the above problem, the inventor has proposed through long-term research the utility model discloses current detection device and electronic equipment in the embodiment, measured current is sampled through the sampling unit to make the control unit handle the sampling signal, and voltage after the sampling of voltage stabilizing unit is stabilized, and then with the voltage output after stabilizing for power supply unit in order to charge power supply unit, thereby realize automatic charging, solved the trouble of the manual change battery of user.
In order to make the technical field person understand the scheme of the present invention better, the following will combine the drawings in the embodiments of the present invention to perform clear and complete description on the technical scheme in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, fig. 1 schematically illustrates a current detection apparatus 100 according to an embodiment of the present invention, where the current detection apparatus 100 includes a sampling unit 110, a control unit 120, a voltage regulation unit 130, and a power supply unit 140. The sampling unit 110 is configured to sample a measured current and output a sampling signal; the control unit 120 is coupled to the sampling unit 110 and configured to receive the sampling signal and process the sampling signal; the voltage stabilizing unit 130 is coupled to the sampling unit 110, and configured to receive the sampling signal and stabilize a voltage of the sampling unit 110 to output a charging signal; the power supply unit 140 is coupled to the voltage regulator unit 130 and the control unit 120, and receives the charging signal to perform charging, and the power supply unit 140 is used for supplying power to the control unit 120.
As shown in fig. 2, the sampling unit 110 includes a current transformer TA1, a sampling resistor coupled to the current transformer TA1, and an amplifying circuit coupled to the sampling resistor. The current transformer TA1 can generate an induced current by the electromagnetic induction principle, and then sample the current in the tested line. On the one hand, after the current transformer TA1 generates an induced current, the sampled current signal is converted into a voltage signal by the sampling resistor, and the voltage signal is amplified by the amplifying circuit and then output to the control unit 120. In this embodiment, the sampling resistor is a resistor R1, and the resistor R1 is connected to two ends of a current transformer TA 1. The amplifier circuit is an operational amplifier a1, and an operational amplifier a1 is connected to both ends of a resistor R1. In some embodiments, the amplifying circuit may also be a triode amplifying circuit, which is not limited herein.
On the other hand, the current transformer TA1 is further coupled to the voltage stabilizing unit 130, and the voltage of the current transformer TA1 is stabilized by the voltage stabilizing unit 130 after the current transformer TA1 generates the induced current. In this embodiment, the voltage stabilizing unit 130 is a voltage stabilizing diode D1, a cathode of the voltage stabilizing diode D1 is coupled to the current transformer TA1, and an anode thereof is grounded, and the voltage of the current transformer TA1 is clamped to 3.6V by the voltage stabilizing diode D1 in this embodiment.
The power supply unit 140 is coupled between the zener diode D1 and the current transformer TA1, and the zener unit 130 clamps the voltage of the current transformer TA1 and then charges the power supply with the clamped voltage signal. In this embodiment, the power supply unit 140 is a rechargeable battery. In some embodiments, the power supply unit 140 may also be a capacitive battery.
In this embodiment, the control unit 120 is a Micro Control Unit (MCU) 120, and the specific model thereof may be a CC1352P chip. The control unit 120 includes a first pin and a second pin. The first pin is coupled to the amplifying circuit to receive the amplified sampling signal, and the control unit 120 can analyze and process the sampling signal after receiving the sampling signal, so as to obtain current data in the line to be tested, and can analyze the power consumption current and the power consumption condition of the device. The second pin is a power terminal of the control unit 120, coupled to the power unit 140, and coupled to a connection node between the power unit 140 and the voltage regulation unit 130, so as to receive power supplied by the power unit 140.
The embodiment of the utility model provides a current detection device comes the sampling measured current through the sampling unit to make the control unit handle sampling signal, and voltage after the sampling of sampling unit is stabilized to the steady voltage unit, and then exports the voltage after will stabilizing for power supply unit in order to charge to power supply unit, thereby realizes automatic charging, has solved the trouble of the manual change battery of user.
As shown in fig. 3, fig. 3 shows another current detection device 200 according to an embodiment of the present invention, the current detection device 200 includes a sampling unit 210, a voltage regulator unit 230, a control unit 220, and a power supply unit 240, which are similar to the current detection device 100, and the sampling unit 210 also includes a current transformer TA2, a sampling resistor, and an amplifying circuit. The current detection device 200 is different from the current detection device 100 in that the current detection device 200 further includes a switch unit 250 and a protection unit 260 in addition to the current detection device 100. The switching unit 250 is coupled between the sampling unit 210 and the voltage stabilizing unit 230, the protection unit 260 is coupled between the switching unit 250 and the power supply unit 240, and the switching unit 250 is further coupled to the control unit 220.
As shown in fig. 4, in the present embodiment, the switching unit 250 is a fet Q1, and the fet Q1 is specifically a P-MOS transistor. In some embodiments, the switching unit 250 may also be an electronic switching device such as a triode, a thyristor, or the like, and is not particularly limited herein. The gate G of the fet Q1 is coupled to the control unit 220 and the protection unit 260, the source S is coupled to the current transformer TA2, and the drain D is coupled to the voltage regulator unit 230. Specifically, the voltage regulation unit 230 in this embodiment is a voltage regulation diode D2, and the drain D of the fet Q1 is coupled to the connection node between the voltage regulation diode D2 and the power supply unit 240.
In this embodiment, the control unit 220 is an MCU, and the specific model thereof may be a CC1352P chip. The control unit 220 has a first pin, a second pin, a third pin, and a fourth pin. The first pin is coupled to the amplifying circuit, and the second pin is coupled to the power unit 240. In this embodiment, the current detection device 200 further includes an antenna unit 270, and the antenna unit 270 is coupled to the third pin of the control unit 220. After the control unit 220 analyzes and processes the data sampled by the sampling unit 210, the analyzed current data is sent to the cloud server through the antenna unit 270, so that the user can obtain the current data of the device from the cloud, and the user experience is improved. And data are transmitted in a wireless mode, redundant wiring can be avoided, and material cost is reduced.
Further, a fourth pin of the control unit 220 is coupled to the switch unit 250, and particularly, the fourth pin is coupled to the gate G of the fet Q1. The control unit 220 is further configured to output a shutdown signal to the switching unit 250 when the sampling signal is processed, so that the switching unit 250 cuts off the coupling state between the sampling unit 210 and the voltage regulation unit 230. Specifically, after the current transformer TA2 generates an induced current, the induced current is output in two paths, that is, the induced current is converted into a voltage across a sampling resistor (in this embodiment, the sampling resistor is a resistor R2), and then amplified by an amplifying circuit (in this embodiment, the amplifying circuit is an operational amplifier a2) to be collected by the control unit 220; and secondly, the voltage is converted into a voltage which is clamped by a voltage stabilizing diode D2 and then is output to the power supply unit 240 to charge the power supply. When the control unit 220 collects the current in the line to be tested, the sampling signal output by the amplifying circuit may be periodically sampled for processing and analysis, or the sampling signal output by the amplifying circuit may be obtained according to the instruction of the user for processing and analysis. No matter which way the control unit 220 obtains the sampling current, when the control unit 220 needs to collect the current of the tested line to analyze and process the current data, the control unit 220 outputs a turn-off signal to the switch unit 250, that is, outputs a high level signal to the fet Q1 to turn off the fet Q1, thereby ensuring that the current induced by the current transformer TA2 is only output to the control unit 220, avoiding the power supply unit 240 being charged to affect the sampling signal obtained by the control unit 220, thereby ensuring the accuracy of analyzing and processing the sampling signal by the control unit 220, and ensuring the accuracy of the current data. It can be understood that, during the interval when the control unit 220 obtains the sampling signal, the fet Q1 is in the conducting state, and the power supply unit 240 can be charged by the induced current of the current transformer TA 2.
Further, the control unit 220 is further configured to sample the voltage of the power supply unit 240, and when the voltage of the power supply unit 240 reaches a preset voltage value, the control unit 220 outputs a turn-off signal to the switching unit 250, so that the switching unit 250 cuts off the coupling state between the sampling unit 210 and the voltage stabilizing unit 230. Specifically, the control unit 220 is preset with a preset voltage value, and periodically samples the voltage of the power supply unit 240, when the power supply unit 240 is charged, if the voltage of the power supply unit 240 reaches the preset voltage value, the control unit 220 outputs a high level signal to the fet Q1 to turn off, and the power supply unit 240 is not charged any more. The preset voltage value may be a charge cut-off voltage of the power supply unit 240.
In this embodiment, the protection unit 260 is a voltage comparator a 3. The voltage comparator a3 has an inverting input coupled to the power unit 240 and the control unit 220, a non-inverting input coupled to the reference voltage, and an output coupled to the gate G of the fet Q1. The protection unit 260 is configured to output a cut-off signal to the switching unit 250 when the voltage of the power supply unit 240 reaches the reference voltage value, so that the switching unit 250 cuts off the coupling state of the sampling unit 210 and the voltage stabilizing unit 230. Specifically, when the current transformer TA2 samples the current in the line to be tested, the current to be tested is suddenly increased, so that the induced current of the current transformer TA2 is also increased, and further, the voltage of the power supply unit 240 during charging is suddenly increased, at this time, the voltage at the non-inverting input end of the voltage comparator A3 is greater than the preset reference voltage value at the inverting input end, so that the voltage comparator A3 outputs a high-level signal to the fet Q1 to turn off the fet Q1, thereby preventing the device from being damaged due to the sudden large current exceeding the withstand voltage value of the device. Wherein the reference voltage value may be set according to the discharge voltage of the power supply unit 240. For example, if the discharge voltage of the power supply unit 240 is 3.7V, the reference voltage value may be set to 3.7V, and considering that the power supply unit 240 is always in the charge-discharge state, and the constant charge-discharge of the power supply unit 240 in the full-charge state may have a certain influence on the lifetime of the power supply unit 240, the reference voltage value may be set to be lower than 3.7V, for example, the reference voltage value may be set to 3.5V, thereby increasing the lifetime of the power supply unit 240. It is understood that the protection function of the protection unit 260 is not performed by the control of the control unit 220, and the control unit 220 may still function as a protection circuit when running away or being halted, so that the stability of the current detection apparatus 200 may be improved.
Further, the current detection device 200 further includes a capacitor C1, and specifically, the capacitor C1 is a super capacitor. The capacitor C1 is coupled between the voltage regulator unit 230 and the power supply unit 240. That is, the sampled current flows through the capacitor C1 to charge the capacitor C1, and when the capacitor C1 is fully charged, the current flows through the power unit 240 to charge the power unit 240. When a large current is suddenly needed in the circuit, the power supply unit 240 suddenly supplies the large current, which has a certain effect on the service life of the power supply unit 240, so that the large current can be supplied through the capacitor C1 to improve the service life of the power supply unit 240. In this embodiment, the withstand voltage of the capacitor C1 may be 3.4V.
Further, the current detection device 200 further includes a first diode, a second diode, and a third diode. Specifically, the first diode is a diode D3, the second diode is a diode D4, and the third diode is a diode D5. The first diode is coupled between the voltage regulation unit 230 and the capacitor C1, and specifically, the anode of the first diode is coupled to the voltage regulation unit 230, and the cathode of the first diode is coupled to the capacitor C1. The first diode is used to prevent capacitor C1 from reverse charging current transformer TA 2. The second diode is coupled between the capacitor C1 and the power unit 240, and specifically, the anode of the second diode is coupled to the capacitor C1, and the cathode of the second diode is coupled to the power unit 240. The second diode is used to prevent the power supply unit 240 from charging the capacitor C1 in reverse. The third diode is coupled between the control unit 220 and the power unit 240, and specifically, the anode of the third diode is coupled to the power unit 240, and the cathode of the third diode is coupled to the control unit 220. The third diode is used for providing a voltage drop, so that the voltage provided by the power supply unit 240 for the control unit 220 is not higher than the working voltage of the control unit 220 all the time, and the normal operation of the control unit 220 is ensured.
The embodiment of the utility model provides a current detection device not only can realize automatic the ability of filling to electrical unit, moreover through switch unit, protection unit and the control unit's guard action, protects current detection device's stability and improves electrical unit's life.
As shown in fig. 5, an embodiment of the present invention further provides an electronic device 300, which includes the current detection apparatus 100 or 200.
Further, the electronic device 300 may be an ammeter, a smart socket, or the like. In the present embodiment, only an ammeter will be explained. As shown in fig. 5, the electronic device 300 in the present embodiment is a clip ammeter. The current clamp meter includes a clamp-shaped housing 310 and the current detection device 100 or 200 disposed in the clamp-shaped housing 310. The pincer-shaped housing 310 has a detection port 320, and a current transformer may be disposed in the pincer-shaped housing 310 around the detection port 320. When a tested line is tested, the tested line can pass through the testing port 320, and then the current in the tested line is induced by the current transformer arranged around the testing port 320.
The embodiment of the utility model provides an electronic equipment samples through the sampling unit and is surveyed the current to make the control unit handle sampling signal, and voltage after the sampling of sampling unit is stabilized to the steady voltage unit, and then the voltage output after will stabilizing is for the electrical unit in order to charge to the electrical unit, thereby realizes automatic charging, has solved the trouble of user's manual change battery.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention has been disclosed by the preferred embodiment, it is not limited to the present invention, and any person skilled in the art can make modifications or changes equivalent to the equivalent embodiments by utilizing the above disclosed technical contents without departing from the technical scope of the present invention, but all the modifications, changes and changes of the technical spirit of the present invention made to the above embodiments are also within the scope of the technical solution of the present invention.
Claims (11)
1. A current detection device is characterized by comprising
The sampling unit is used for sampling the tested current and outputting a sampling signal;
a control unit coupled to the sampling unit, the control unit being configured to receive the sampling signal to process the sampling signal;
the voltage stabilizing unit is coupled to the sampling unit and used for receiving the sampling signal and stabilizing the voltage of the sampling unit to output a charging signal;
and the power supply unit is coupled with the voltage stabilizing unit and the control unit and receives the charging signal to charge energy, and the power supply unit is used for supplying power to the control unit.
2. The current detection apparatus according to claim 1, further comprising a switch unit coupled between the sampling unit and the voltage regulator unit, wherein the control unit is coupled to the switch unit, and is further configured to sample the voltage of the power supply unit, and when the voltage of the power supply unit reaches a predetermined voltage value, the control unit outputs a turn-off signal to the switch unit, so that the switch unit switches off the coupling state between the sampling unit and the voltage regulator unit.
3. The current detection apparatus of claim 2, further comprising a protection unit coupled between the switching unit and the power supply unit, wherein the protection unit is configured to output a cut-off signal to the switching unit when the voltage of the power supply unit reaches a reference voltage value, so that the switching unit cuts off the coupling state of the sampling unit and the voltage stabilization unit.
4. The current sensing device as claimed in claim 3, wherein the switching unit comprises a field effect transistor, a gate of the field effect transistor is coupled to the control unit and the protection unit, a source of the field effect transistor is coupled to the sampling unit, and a drain of the field effect transistor is coupled to the voltage regulation unit.
5. The current detecting device of claim 3, wherein the protection unit comprises a voltage comparator, an inverting input terminal of the voltage comparator is preset with the reference voltage value, a non-inverting input terminal of the voltage comparator is coupled to the power supply unit, and an output terminal of the voltage comparator is coupled to the switch unit.
6. The current detection apparatus according to claim 1, further comprising a switch unit coupled between the sampling unit and the voltage regulator unit, wherein the control unit is coupled to the switch unit, and the control unit is further configured to output a turn-off signal to the switch unit when processing the sampling signal, so that the switch unit switches off the coupling state between the sampling unit and the voltage regulator unit.
7. The current sensing apparatus of any one of claims 1-6, further comprising a capacitor coupled between the voltage regulator unit and the power supply unit.
8. The current detecting device of claim 7, wherein a first diode is coupled between the voltage stabilizing unit and the capacitor, and the first diode has an anode coupled to the voltage stabilizing unit and a cathode coupled to the capacitor; a second diode is coupled between the capacitor and the power supply unit, and the anode of the second diode is coupled with the capacitor and the cathode of the second diode is coupled with the power supply unit.
9. The current sensing device according to any one of claims 1-6, wherein a third diode is coupled between the control unit and the power supply unit, and wherein an anode of the third diode is coupled to the power supply unit and a cathode of the third diode is coupled to the control unit.
10. The current sensing device according to any one of claims 2 to 6, wherein the sampling unit includes: the current transformer, be coupled in current transformer's sampling resistance and be coupled in the amplifier circuit of sampling resistance, the control unit is coupled in amplifier circuit, the switch element is coupled in current transformer.
11. An electronic device characterized in that it comprises a current detection apparatus according to any one of claims 1 to 10.
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| CN201921391921.XU CN211206607U (en) | 2019-08-26 | 2019-08-26 | Current detection device and electronic apparatus |
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| CN114076844A (en) * | 2020-08-21 | 2022-02-22 | 深圳绿米联创科技有限公司 | Zero-crossing control method, electronic device, and storage medium |
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| CN114076844A (en) * | 2020-08-21 | 2022-02-22 | 深圳绿米联创科技有限公司 | Zero-crossing control method, electronic device, and storage medium |
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