CN210894671U - Power failure detection circuit, power failure detection system and ammeter - Google Patents
Power failure detection circuit, power failure detection system and ammeter Download PDFInfo
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- CN210894671U CN210894671U CN201921829810.2U CN201921829810U CN210894671U CN 210894671 U CN210894671 U CN 210894671U CN 201921829810 U CN201921829810 U CN 201921829810U CN 210894671 U CN210894671 U CN 210894671U
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Abstract
The utility model provides a power failure detection circuit, a power failure detection system and an ammeter, which relate to the technical field of power failure detection, wherein the power failure detection circuit comprises a voltage reduction rectification circuit, a voltage division circuit and a first power supply output circuit, wherein the voltage division circuit and the first power supply output circuit are connected to an external control chip; the voltage reduction rectification circuit is also connected with an external power supply to carry out voltage reduction rectification processing on an alternating current signal input by the external power supply so as to obtain a direct current signal, and the direct current signal is transmitted to the first power supply output circuit so as to supply power to the external control chip; the voltage division circuit divides the acquired direct current signal and sends the divided direct current signal to the external control chip, so that the external control chip performs power failure detection according to the divided direct current signal.
Description
Technical Field
The utility model belongs to the technical field of the power failure detection technique and specifically relates to a power failure detection circuit, power failure detection system and ammeter.
Background
The power supply line needs to be monitored in real time in the use process of the electric energy meter, and the purpose is to avoid the phenomenon of data loss caused by sudden power failure of the power supply line, so that a circuit with a power failure detection function is very necessary to be configured in the electric energy meter.
However, the power failure detection circuit in the current electric energy meter has a complex structure and numerous components, so that the use cost of a user is increased.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a fall electric detection circuitry, fall electric detection system and ammeter to alleviate above-mentioned technical problem.
In a first aspect, the embodiment of the utility model provides a power down detection circuit, wherein, this power down detection circuit includes: the voltage-reducing rectification circuit, and a voltage division circuit and a first power supply output circuit which are connected with the voltage-reducing rectification circuit, wherein the voltage division circuit and the first power supply output circuit are both connected to an external control chip; the voltage reduction rectification circuit is also connected with an external power supply and used for carrying out voltage reduction rectification processing on an alternating current signal input by the external power supply so as to obtain a direct current signal and transmitting the direct current signal to the first power supply output circuit so as to supply power to the external control chip; the voltage division circuit is used for carrying out voltage division processing on the obtained direct current signal and sending the direct current signal subjected to voltage division processing to the external control chip, so that the external control chip carries out power failure detection according to the direct current signal subjected to voltage division processing.
With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, wherein the step-down rectification circuit includes a resistance-capacitance step-down unit and a half-wave rectification element connected to the resistance-capacitance step-down unit; the resistance-capacitance voltage reduction unit is connected with an external power supply and is used for carrying out voltage reduction processing on the alternating current signals; and the half-wave rectifying element is used for rectifying the alternating current signal subjected to voltage reduction processing to obtain a direct current signal.
In combination with the first possible implementation manner of the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, where the voltage dividing circuit includes a first resistor and a ground resistor connected to the first resistor, where the first resistor is further connected to the half-wave rectifier element; the grounding resistor is also connected with an external control chip and used for enabling the external control chip to carry out power failure detection according to an electric signal on the grounding resistor.
With reference to the second possible implementation manner of the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, wherein the voltage dividing circuit further includes a first filter capacitor; the first filter capacitor is connected with the grounding resistor and is used for filtering the electric signal on the grounding resistor.
In combination with the second possible implementation manner of the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, wherein the first power supply output circuit includes a first switch tube and a sampling unit connected to a base of the first switch tube, where the sampling unit includes a second resistor and a first zener diode connected to the second resistor, the first zener diode is grounded, and the first zener diode is further connected to the second filter capacitor; the collector of the first switching tube and the second resistor are both connected with the half-wave rectifier element; and the emitter of the first switching tube is connected with an external control chip through a filtering unit.
With reference to the first possible implementation manner of the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, wherein the power failure detection circuit further includes a second power supply output circuit; the second power supply output circuit comprises a second switching tube, a voltage stabilizing unit connected with the base electrode of the second switching tube and a rectifying and filtering unit connected with the collector electrode of the second switching tube, the voltage stabilizing unit is also connected with the rectifying and filtering unit, and the emitter electrode of the second switching tube is connected with an external metering chip; the rectification filtering unit is also connected with the resistance-capacitance voltage reduction unit and is used for rectifying and filtering the alternating current signals subjected to voltage reduction processing to obtain direct current power supply signals and transmitting the direct current power supply signals to the voltage stabilization unit; the voltage stabilizing unit is used for carrying out voltage stabilizing processing on the direct current power supply signal and driving the second switching tube to provide a working electric signal for the external metering chip by utilizing the direct current power supply signal after voltage stabilizing processing.
In combination with the fifth possible implementation manner of the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, wherein the voltage stabilizing unit includes a third resistor and a second voltage stabilizing diode connected to the third resistor, the second voltage stabilizing diode is connected to an external power source, and the second voltage stabilizing diode is further connected to a third filter capacitor; the third resistor is connected with the rectifying and filtering unit, and the second voltage stabilizing diode is also connected with the base electrode of the second switching tube.
With reference to the fifth possible implementation manner of the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, wherein the power failure detection circuit further includes a fourth filter capacitor; and the fourth filter capacitor is connected with the emitting electrode of the second switching tube and is used for filtering the working electric signal.
In a second aspect, the embodiment of the present invention further provides a power-down detection system, wherein the power-down detection system includes an external control chip, an external metering chip, and the power-down detection circuit; and the external control chip and the external metering chip are both connected with the power failure detection circuit.
The third aspect of the present invention provides an ammeter, wherein, this ammeter disposes foretell electricity down detection system.
The embodiment of the utility model provides a following beneficial effect has been brought:
the embodiment of the utility model provides a pair of fall electric detection circuitry, fall electric detection system and ammeter should fall electric detection circuitry and include: the voltage-reducing rectification circuit, and a voltage division circuit and a first power supply output circuit which are connected with the voltage-reducing rectification circuit, wherein the voltage division circuit and the first power supply output circuit are both connected to an external control chip; the voltage reduction rectification circuit is also connected with an external power supply and used for carrying out voltage reduction rectification processing on an alternating current signal input by the external power supply so as to obtain a direct current signal and transmitting the direct current signal to the first power supply output circuit so as to supply power to the external control chip; the voltage division circuit is used for carrying out voltage division processing on the obtained direct current signal and sending the direct current signal subjected to voltage division processing to the external control chip, so that the external control chip carries out power failure detection according to the direct current signal subjected to voltage division processing.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a power failure detection circuit provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another power down detection circuit provided in an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a power down detection circuit provided in an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a power failure detection system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an electricity meter according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some embodiments of the present invention, 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.
At present, an electric energy meter is one of the most important metering components of a power supply system, and is one of essential energy sources in production and life of people. In order to ensure that the electric energy meter can safely operate, the general electric energy meter has a power failure detection function, and the use cost of a user is improved because the existing power failure detection circuit has a complex structure and numerous components. Based on this, the embodiment of the utility model provides a pair of fall electric detection circuitry, fall electric detection system and ammeter can alleviate above-mentioned technical problem.
For the convenience of understanding the present embodiment, a power down detection circuit disclosed in the embodiments of the present invention is first described in detail.
The first embodiment is as follows:
the embodiment of the utility model provides a fall electric detection circuitry, as the structural schematic diagram that falls electric detection circuitry that FIG. 1 is shown, should fall electric detection circuitry includes: the voltage-reducing rectification circuit comprises a voltage-reducing rectification circuit 100, and a voltage division circuit 101 and a first power supply output circuit 102 which are connected with the voltage-reducing rectification circuit, wherein the voltage division circuit and the first power supply output circuit are both connected to an external control chip.
Specifically, the step-down rectification circuit is further connected with an external power supply, and is used for performing step-down rectification processing on an alternating current signal input by the external power supply to obtain a direct current signal, and transmitting the direct current signal to the first power supply output circuit to supply power to the external control chip; the voltage division circuit is used for carrying out voltage division processing on the obtained direct current signal and sending the direct current signal subjected to voltage division processing to the external control chip, so that the external control chip carries out power failure detection according to the direct current signal subjected to voltage division processing.
During specific implementation, because the external power supply provides three-phase alternating current and the voltage provided by the external power supply is very high, in the process of performing power failure detection by using an external control chip, firstly, voltage reduction and rectification processing needs to be performed on an alternating current signal input by the external power supply to obtain a direct current signal, then, the direct current signal is subjected to voltage division processing by a voltage division circuit and then is sent to the external control chip, then, the external control chip judges whether the direct current signal subjected to the voltage division processing is lower than a pre-stored power failure detection threshold value, if the direct current signal subjected to the voltage division processing is lower than the pre-stored power failure detection threshold value, it is indicated that the external power supply is powered down, and the external control chip needs to perform data storage and enters a low power; if the direct current signal after voltage division processing is not lower than a pre-stored power failure detection threshold value, it indicates that the external power supply has no power failure, and the circuit can normally operate; in addition, the alternating current signal processed by the voltage reduction rectification circuit can also supply power to an external control chip through the first power supply output circuit.
The embodiment of the utility model provides a pair of fall electric detection circuitry, this fall electric detection circuitry includes: the voltage-reducing rectification circuit, and a voltage division circuit and a first power supply output circuit which are connected with the voltage-reducing rectification circuit, wherein the voltage division circuit and the first power supply output circuit are both connected to an external control chip; the voltage reduction rectification circuit is also connected with an external power supply and used for carrying out voltage reduction rectification processing on an alternating current signal input by the external power supply so as to obtain a direct current signal and transmitting the direct current signal to the first power supply output circuit so as to supply power to the external control chip; the voltage division circuit is used for carrying out voltage division processing on the obtained direct current signal and sending the direct current signal subjected to voltage division processing to the external control chip, so that the external control chip carries out power failure detection according to the direct current signal subjected to voltage division processing.
Further, on the basis of fig. 1, fig. 2 shows a schematic structural diagram of another power failure detection circuit, as shown in fig. 2, the buck rectification circuit includes a resistance-capacitance buck unit 200, and a half-wave rectification element 201 connected to the resistance-capacitance buck unit; the resistance-capacitance voltage reduction unit is connected with an external power supply and is used for carrying out voltage reduction processing on the alternating current signals; and the half-wave rectifying element is used for rectifying the alternating current signal subjected to voltage reduction processing to obtain a direct current signal.
When the direct current signal is used specifically, the resistance-capacitance voltage reduction unit is used for carrying out voltage reduction on alternating current of each phase line of an external power supply, and then the half-wave rectifier element is used for carrying out filtering processing to obtain the direct current signal. Since three phase lines of the external power source are the same, for convenience of description, a power source of a C-phase live wire is taken as an example for illustration, and fig. 3 shows a circuit schematic diagram of a power failure detection circuit, as shown in fig. 3, the resistance-capacitance voltage reduction unit includes a zener diode D6, a capacitor C3, a resistor R3 and a zener diode D5, wherein an anode of the zener diode D6 is connected with the neutral wire 300, a cathode of the zener diode D6 is connected with a cathode of the zener diode D5 through the capacitor C3 and the resistor R3, an anode of the zener diode D5 is connected with the C-phase live wire 301, a cathode of the zener diode D6 is further connected with the half-wave rectifying element 201, and a voltage on the zener diode D6 is rectified by the half-wave rectifying element 201 and then converged with a half-wave rectified voltages of the a phase and the B phase to obtain the. In this embodiment, the voltage reduction processing modes of the phase a live wire power supply and the phase B live wire power supply are the same as the processing mode of the phase C live wire power supply, and are not described herein again.
Specifically, the voltage division circuit comprises a first resistor and a grounding resistor connected with the first resistor, wherein the first resistor is also connected with the half-wave rectifier element; the grounding resistor is also connected with an external control chip and used for enabling the external control chip to carry out power failure detection according to an electric signal on the grounding resistor.
As shown in fig. 3, one end of a first resistor R11 of the voltage dividing circuit is connected to the half-wave rectifier 201, and the other end is connected to a ground resistor R15, in this embodiment, an external control chip compares an electrical signal on the ground resistor R15 with a pre-stored power-down detection threshold, and determines whether the external power source is powered down according to the comparison result, if the electrical signal on the ground resistor R15 is greater than the power-down detection threshold, the external power source is not powered down, and if the electrical signal on the ground resistor R15 is less than the power-down detection threshold, the external power source is powered down; therefore, the external control chip needs to obtain the electrical signal of the ground resistor R15, so the ground resistor is further connected to the external control chip 302 for the external control chip to perform power down detection according to the electrical signal of the ground resistor.
In practical use, as shown in fig. 3, in order to eliminate the impurity signal of the electrical signal on the ground resistor R15, the ground resistor R15 needs to be connected in parallel with the first filter capacitor C8, so that the first filter capacitor C8 can filter the electrical signal on the ground resistor, and the external control chip can perform accurate power-down detection according to the electrical signal on the ground resistor R15. The power failure detection mode has the advantages that the power failure detection is carried out by sampling through the external control chip after the voltage is divided by the resistors, so that the cost of the power failure detection is reduced.
In specific implementation, the first power supply output circuit comprises a first switch tube and a sampling unit connected with a base electrode of the first switch tube, wherein the sampling unit comprises a second resistor and a first voltage stabilizing diode connected with the second resistor, the first voltage stabilizing diode is grounded, and the first voltage stabilizing diode is also connected with a second filter capacitor; the collector of the first switching tube and the second resistor are both connected with the half-wave rectifier element; and the emitter of the first switching tube is connected with an external control chip through a filtering unit.
For convenience of illustration, as shown in fig. 3, the base B of the first switching tube Q4 is connected to the cathode of a first zener diode D16 in the sampling unit, the cathode of the first zener diode D16 is further connected to a second resistor R7 in the sampling unit, the anode of the first zener diode D16 is grounded, and the first zener diode D16 is further connected to a second filter capacitor C38; the second resistor R7 and the collector C of the first switching tube Q4 are both connected to the half-wave rectifier element 201; an emitter E of the first switching tube is connected with the external control chip 302 through filter capacitors C7 and C16 which are connected in parallel, and is used for transmitting the direct-current electric signal to the external control chip for power supply after being subjected to voltage stabilization and filtering by the first power supply output circuit.
As shown in fig. 2, the power down detection circuit further includes a second power supply output circuit 202; the second power supply output circuit comprises a second switch tube 203, a voltage stabilizing unit 204 connected with the base electrode of the second switch tube and a rectifying and filtering unit 205 connected with the collector electrode of the second switch tube, the voltage stabilizing unit is also connected with the rectifying and filtering unit, and the emitter electrode of the second switch tube is connected with an external metering chip; the rectifying and filtering unit is further connected with the resistance-capacitance voltage-reducing unit 200, and is configured to perform rectifying and filtering on the ac power signal after voltage-reducing processing to obtain a dc power supply signal, and transmit the dc power supply signal to the voltage-stabilizing unit; the voltage stabilizing unit is used for carrying out voltage stabilizing processing on the direct current power supply signal and driving the second switching tube to provide a working electric signal for the external metering chip by utilizing the direct current power supply signal after voltage stabilizing processing.
Specifically, as shown in fig. 3, the cathode of the zener diode in the rc unit 200 is further connected to the anode of the rectifier diode D11 in the rectifying and smoothing unit 205, the cathode of the rectifier diode D11 is connected to the collector C of the second switching tube 203, and the cathode of the rectifier diode D11 is further connected to the C-phase live wire 301 through the smoothing capacitor E4; the base B of the second switching tube 203 is connected to the cathode of the second zener diode D15 in the zener unit 204, the cathode of the second zener diode D15 is connected to the collector C of the second switching tube 203 through the third resistor R6 in the zener unit 204, and the anode of the second zener diode D15 is connected to the C-phase live wire 301; the second zener diode D16 is further connected to the third filter capacitor C37; an emitter E of the second switching tube is connected with the external metering chip 303 through a fourth filter capacitor C15 connected in parallel, and is used for transmitting the direct-current signal to the external metering chip for power supply after being rectified and stabilized by the second power supply output circuit.
Example two:
the embodiment of the utility model provides a power failure detection system is still provided, fig. 4 shows a power failure detection system's schematic structural diagram, as shown in fig. 4, this power failure detection system includes external control chip 302, external measurement chip 303, still includes foretell power failure detection circuit 400; and the external control chip and the external metering chip are both connected with the power failure detection circuit.
The embodiment of the utility model provides a fall electric detection system, fall electric detection circuit with the aforesaid embodiment provides and have the same technical characteristic, so also can solve the same technical problem, reach the same technological effect.
The embodiment of the utility model provides a still provide an ammeter, fig. 5 shows a structural schematic diagram of ammeter, as shown in fig. 5, this ammeter 500 disposes foretell fall electric detection system 501.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the power failure detection system and the electric meter described above may refer to the corresponding process in the foregoing power failure detection circuit embodiment, and details are not repeated herein.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still modify or easily conceive of changes in the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A power down detection circuit, the power down detection circuit comprising: the voltage-reducing rectification circuit comprises a voltage-reducing rectification circuit, a voltage-dividing circuit and a first power supply output circuit, wherein the voltage-dividing circuit and the first power supply output circuit are connected with the voltage-reducing rectification circuit and are both connected to an external control chip;
the voltage reduction rectification circuit is also connected with an external power supply and used for carrying out voltage reduction rectification processing on an alternating current signal input by the external power supply so as to obtain a direct current signal and transmitting the direct current signal to the first power supply output circuit so as to supply power to the external control chip;
the voltage division circuit is used for carrying out voltage division processing on the obtained direct current signal and sending the direct current signal subjected to voltage division processing to the external control chip, so that the external control chip carries out power failure detection according to the direct current signal subjected to voltage division processing.
2. The power failure detection circuit according to claim 1, wherein the step-down rectification circuit includes a resistance-capacitance step-down unit, and a half-wave rectification element connected to the resistance-capacitance step-down unit;
the resistance-capacitance voltage reduction unit is connected with the external power supply and is used for carrying out voltage reduction processing on the alternating current signals;
and the half-wave rectifying element is used for rectifying the alternating current signal subjected to voltage reduction processing to obtain the direct current signal.
3. The power-down detection circuit according to claim 2, wherein the voltage divider circuit comprises a first resistor and a ground resistor connected to the first resistor, wherein the first resistor is further connected to the half-wave rectifier element;
the grounding resistor is also connected with the external control chip and used for enabling the external control chip to carry out power failure detection according to the electric signal on the grounding resistor.
4. The power down detection circuit of claim 3, wherein the voltage divider circuit further comprises a first filter capacitor;
the first filter capacitor is connected with the grounding resistor and is used for filtering the electric signal on the grounding resistor.
5. The power failure detection circuit according to claim 3, wherein the first power supply output circuit comprises a first switch tube and a sampling unit connected to a base of the first switch tube, wherein the sampling unit comprises a second resistor and a first zener diode connected to the second resistor, the first zener diode is connected to an external power supply, and the first zener diode is further connected to a second filter capacitor;
the collector of the first switching tube and the second resistor are both connected with the half-wave rectifier element;
and the emitter of the first switching tube is connected with the external control chip through a filtering unit.
6. The power down detection circuit of claim 2, further comprising a second power supply output circuit;
the second power supply output circuit comprises a second switching tube, a voltage stabilizing unit connected with the base electrode of the second switching tube and a rectifying and filtering unit connected with the collector electrode of the second switching tube, the voltage stabilizing unit is also connected with the rectifying and filtering unit, and the emitter electrode of the second switching tube is connected with an external metering chip;
the rectification filtering unit is also connected with the resistance-capacitance voltage reduction unit and is used for rectifying and filtering the alternating current signal subjected to voltage reduction processing to obtain a direct current power supply signal and transmitting the direct current power supply signal to the voltage stabilization unit;
the voltage stabilizing unit is used for performing voltage stabilizing processing on the direct current supply signal and driving the second switching tube to provide a working electric signal for the external metering chip by using the direct current supply signal after voltage stabilizing processing.
7. The power-down detection circuit according to claim 6, wherein the voltage regulation unit comprises a third resistor and a second voltage regulation diode connected to the third resistor, the second voltage regulation diode is grounded, and the second voltage regulation diode is further connected to a third filter capacitor;
the third resistor is connected with the rectifying and filtering unit, and the second voltage stabilizing diode is also connected with the base electrode of the second switching tube.
8. The power down detection circuit of claim 6, further comprising a fourth filter capacitor;
and the fourth filter capacitor is connected with the emitting electrode of the second switch tube and is used for filtering the working electric signal.
9. A power failure detection system is characterized by comprising an external control chip, an external metering chip and a power failure detection circuit according to any one of claims 1 to 8;
the external control chip and the external metering chip are both connected with the power failure detection circuit.
10. An electricity meter equipped with the power failure detection system of claim 9.
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| CN201921829810.2U CN210894671U (en) | 2019-10-29 | 2019-10-29 | Power failure detection circuit, power failure detection system and ammeter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112180284A (en) * | 2020-09-23 | 2021-01-05 | 歌尔科技有限公司 | Power failure detection method and device for alternating current power supply of electric equipment and related equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112180284A (en) * | 2020-09-23 | 2021-01-05 | 歌尔科技有限公司 | Power failure detection method and device for alternating current power supply of electric equipment and related equipment |
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