CN108347094B - Switching circuit and electronic device - Google Patents
Switching circuit and electronic device Download PDFInfo
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- CN108347094B CN108347094B CN201810318441.4A CN201810318441A CN108347094B CN 108347094 B CN108347094 B CN 108347094B CN 201810318441 A CN201810318441 A CN 201810318441A CN 108347094 B CN108347094 B CN 108347094B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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Abstract
The invention provides a switching circuit and electronic equipment, and relates to the technical field of communication, wherein the switching circuit comprises a control module and a switching module connected with the control module, the control module comprises a first relay, and the switching module comprises a second relay; the control module is used for controlling the switching direction of the COM common end of the first relay in advance; the switching module is used for controlling the COM public end of the second relay to output different signals according to the switching direction, simultaneously realizing the power-down memory and power-down switching functions of the switching circuit, and solving the problem of limited switching function caused by the traditional circuit design.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a switching circuit and an electronic device.
Background
In the field of broadcast television, the output backup function of signals is often required for ensuring the safe broadcasting of the signals, and the continuous output of the signals is ensured even if the equipment is powered off. The switching circuit is a commonly used functional circuit for realizing the function, and when a system or a circuit has a fault and needs switching of signals, the switching circuit can execute switching action on corresponding signals.
In the prior art, a switching circuit after power failure can only singly select a power failure memory function (a relay is not switched) or a power failure switching function, namely, only output of a certain fixed input signal can be realized after power failure. In addition, the power-off memory and the power-off switching also need to be respectively designed with different hardware control circuits and cannot be flexibly changed in a software mode.
Disclosure of Invention
In view of this, the present invention is directed to provide a switching circuit and an electronic device, which simultaneously implement power-down memory and power-down switching functions of the switching circuit, and solve the problem of limited switching functions caused by the conventional circuit design.
In a first aspect, an embodiment of the present invention provides a switching circuit, including a control module and a switching module connected to the control module, where the control module includes a first relay, and the switching module includes a second relay;
the control module is used for controlling the switching direction of the COM common end of the first relay in advance;
and the switching module is used for controlling the COM common end of the second relay to output different signals according to the switching direction.
With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where the control module further includes a controller, an energy storage unit, a first control unit, and a second control unit;
a first signal end of the controller is connected with one end of the first control unit, and the other end of the first control unit is respectively connected with one end of the energy storage unit and a set end of the first relay;
and a second signal end of the controller is connected with one end of the second control unit, and the other end of the second control unit is connected with the reset end of the first relay.
With reference to the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, wherein a COM common terminal of the first relay is connected to the switching module, an S1 terminal of the first relay and the other terminal of the energy storage unit are respectively connected to a power source VCS, and an S2 terminal of the first relay is floating.
With reference to the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, where the switching module further includes a controller, a resistor R5, a first switching unit, and a second switching unit;
a third signal end of the controller is respectively connected with the resistor R5 and one end of the first switching unit, the other end of the first switching unit is connected with a set end of the second relay, and the other end of the resistor R5 is connected with the control module;
and a fourth signal end of the controller is connected with one end of the second switching unit, and the other end of the second switching unit is connected with a reset end of the second relay.
With reference to the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where S1 of the second relay is terminated with a first input signal, S2 of the second relay is terminated with a second input signal, and a COM common terminal of the second relay outputs different signals according to the switching direction.
With reference to the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, where the energy storage unit includes a diode VD3, a capacitor C7, a capacitor C8, and a capacitor C9;
the anode of the diode VD3 is connected to the power VCC, the cathode of the diode VD3 is respectively connected to one end of the capacitor C7, the capacitor C8 and the capacitor C9 and the power VCS, and the other end of the capacitor C7, the other end of the capacitor C8 and the other end of the capacitor C9 are connected to the signal ground.
With reference to the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, where the control unit includes a resistor R1, a resistor R2, and a transistor VT 1;
the signal end of controller with resistance R1's one end is connected, resistance R1's the other end with triode VT 1's base is connected, triode VT 1's emitter ground, triode VT 1's collecting electrode respectively with resistance R2's one end with first relay is connected, resistance R2's another termination power VCC.
With reference to the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, where the switching unit includes a resistor R6, a resistor R7, and a transistor VT 3;
the signal end of the controller is connected with one end of a resistor R6, the other end of the resistor R6 is connected with the base electrode of the triode VT3, the emitting electrode of the triode VT3 is grounded, the collecting electrode of the triode VT3 is respectively connected with one end of a resistor R7 and the second relay, and the other end of the resistor R7 is connected with a power supply VCS.
With reference to the first aspect, an embodiment of the present invention provides an eighth possible implementation manner of the first aspect, where when the COM common terminal of the first relay is switched to the S2 terminal of the first relay, the COM common terminal of the second relay outputs an initial signal;
when the COM common end of the first relay is switched to the S1 end of the first relay, the second relay performs a switching operation, and the COM common end of the second relay outputs a switching signal.
In a second aspect, an embodiment of the present invention further provides an electronic device, including the switching circuit as described above.
The embodiment of the invention provides a switching circuit and electronic equipment, which comprise a control module and a switching module connected with the control module, wherein the control module comprises a first relay, and the switching module comprises a second relay; the control module is used for controlling the switching direction of the COM common end of the first relay in advance; the switching module is used for controlling the COM public end of the second relay to output different signals according to the switching direction, the switching circuit can be used for simultaneously realizing the power-down memory and power-down switching functions of the switching circuit, and the problem that the switching function is limited due to the traditional circuit design is solved.
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 claims hereof as well as the appended 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 description of the embodiments or 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 other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of a switching circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an energy storage unit in a switching circuit according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of a control unit in a switching circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a switching unit in a switching circuit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of the operation of a bistable relay in the switching circuit according to the embodiment of the present invention.
Icon: 10-a control module; 20-a switching module; 11-a first control unit; 12-a second control unit; 13-an energy storage unit; 21-a first switching unit; 22-second switching unit.
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 clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the prior art, a switching circuit after power failure can only singly select a power failure memory function (a relay is not switched) or a power failure switching function, namely, only output of a certain fixed input signal can be realized after power failure. In addition, different hardware control circuits are required to be designed for power-off memory and power-off switching respectively, and the hardware control circuits cannot be flexibly changed in a software mode;
in a conventional relay excitation circuit, a controller outputs two switching control signals SWITCH1 control signal 1 and SWITCH2 control signal 2, and then the two switching control signals SWITCH1 control signal 1 and SWITCH2 control signal 2 are respectively connected with two NPN triodes, and the control signals converted by the NPN triodes are respectively connected with a relay. Although the traditional exciter circuit is simple, certain disadvantages exist, and the reason is analyzed as follows:
after power failure, the electric appliance is not controlled any more, and if the power failure memory function is realized, a bistable relay is needed to be adopted by the relay; if the power failure switching function is realized, the relay needs to adopt a monostable relay and can only switch in one fixed direction, and the power failure memory and the power failure switching can not be flexibly changed in a software mode.
Based on this, the switching circuit and the electronic device provided by the embodiment of the invention can simultaneously realize the power-down memory and power-down switching functions of the switching circuit, and solve the problem of limited switching function caused by the traditional circuit design.
The following is a detailed description by way of example.
Fig. 1 is a schematic diagram of a switching circuit structure according to an embodiment of the present invention.
Referring to fig. 1, the switching circuit includes a control module 10 and a switching module 20 connected to the control module 10, the control module 10 includes a first relay, and the switching module 20 includes a second relay;
the control module 10 is used for controlling the switching direction of the COM common terminal of the first relay in advance;
the switching module 20 is configured to control the COM common terminal of the second relay to output different signals according to the switching direction.
Specifically, according to the switching circuit provided by the embodiment of the invention, a user can make the switching circuit after power failure execute a switching action or not execute the switching action through corresponding setting, namely, the user can set whether the power failure memory function or the power failure switching function is kept after the equipment is powered off through software before the power failure, and the switching circuit has the advantages of simple structure, excellent circuit performance, strong practicability and wide application range.
The first relay and the second relay are both bistable relays;
here, the controller may be, but not limited to, a CPU, and may be a Logic Programmable device such as cpld (complex Programmable Logic device), FPGA (Field-Programmable Gate Array), or dsp (digital signal processing).
Further, the control module 10 further includes a controller, an energy storage unit 13, a first control unit 11 and a second control unit 12;
a first signal end of the controller is connected with one end of a first control unit 11, and the other end of the first control unit 11 is respectively connected with one end of an energy storage unit 13 and a set end of a first relay;
a second signal terminal of the controller is connected to one end of the second control unit 12, and the other end of the second control unit 12 is connected to the reset terminal of the first relay.
Furthermore, the COM common terminal of the first relay is connected to the switching module 20, the S1 terminal of the first relay and the other terminal of the energy storage unit 13 are respectively connected to the power source VCS, and the S2 terminal of the first relay is floating.
Further, the switching module 20 further includes a controller, a resistor R5, a first switching unit 21, and a second switching unit 22;
a third signal end of the controller is respectively connected with the resistor R5 and one end of the first switching unit 21, the other end of the first switching unit 21 is connected with a set end of the second relay, and the other end of the resistor R5 is connected with the control module 10;
a fourth signal terminal of the controller is connected to one end of the second switching unit 22, and the other end of the second switching unit 22 is connected to the reset terminal of the second relay.
Furthermore, the S1 terminal of the second relay is connected with the first input signal, the S2 terminal of the second relay is connected with the second input signal, and the COM common terminal of the second relay outputs different signals according to the switching direction.
Further, as shown in fig. 2, the energy storage unit 13 includes a diode VD3, a capacitor C7, a capacitor C8, and a capacitor C9;
the anode of the diode VD3 is connected with the power VCC, the cathode of the diode VD3 is respectively connected with one end of the capacitor C7, the capacitor C8 and the capacitor C9 and the power VCS, and the other end of the capacitor C7, the other end of the capacitor C8 and the other end of the capacitor C9 are connected with the signal ground.
Here, the three large electrolytic capacitors are for energy storage, and power can be supplied by the power source VCS after VCC is powered down.
Further, as shown in fig. 3, the control unit includes a resistor R1, a resistor R2, and a transistor VT 1;
the signal end of the controller is connected with one end of a resistor R1, the other end of the resistor R1 is connected with the base electrode of a triode VT1, the emitting electrode of the triode VT1 is grounded, the collecting electrode of the triode VT1 is respectively connected with one end of a resistor R2 and a first relay, and the other end of the resistor R2 is connected with a power supply VCC.
Here, the first control unit 11 and the second control unit 12 both adopt the above-described structure, and are not described in detail herein;
further, as shown in fig. 4, the switching unit includes a resistor R6, a resistor R7, and a transistor VT 3;
the signal end of the controller is connected with one end of a resistor R6, the other end of the resistor R6 is connected with the base electrode of a triode VT3, the emitting electrode of the triode VT3 is grounded, the collecting electrode of the triode VT3 is respectively connected with one end of a resistor R7 and a second relay, and the other end of the resistor R7 is connected with a power supply VCS.
Here, the first switching unit 21 and the second switching unit 22 both adopt the above-described structure, and are not described herein again;
further, when the COM common terminal of the first relay is tangential to the S2 terminal of the first relay, the COM common terminal of the second relay outputs an initial signal;
when the COM common end of the first relay is tangential to the S1 end of the first relay, the second relay performs switching action, and the COM common end of the second relay outputs a switching signal.
Here, the controller may control whether one end of the resistor R5 is turned on with the power source VCS after power down, thereby controlling whether the transistor VT3 is turned on during a period of power down.
Specifically, the switching direction of the control module 10 is set through software, and the switching direction includes two options of signal switching and signal non-switching;
for example, the signal is not switched, the COM common terminal of the first relay is cut to the S2 terminal of the first relay, the S2 terminal is floating, and then one terminal of R5 is floating. After the system is powered down, 2 control signals (a SWITCH1 first control signal and a SWITCH2 second control signal) output by the controller to the first relay disappear at the same time, the SET (single-electron transistor) position end and the RESET (RESET) RESET end of the first relay are consistent in voltage, the first relay is not switched, and the COM (component object model) common end of the first relay is still tangential to the S2 end of the first relay after the system is powered down, namely one end of the resistor R5 is suspended;
after the power failure, the circuit (the switching module 20) related to the second relay disappears simultaneously due to the system power failure, and 2 control signals (the third control signal of the SWICH3 and the fourth control signal of the SWICH 4) output by the controller to the second relay, so that the voltages of the SET end and the RESET end of the second relay are consistent, the signal output by the second relay is not switched, and the output signal is the initial signal.
For another example, the signal switching is performed by software setting the COM common terminal of the first relay to be tangential to the S1 terminal of the first relay, the S1 terminal is connected to the power source VCS, and then the terminal of R5 and VCS are turned on. After the system is powered down, 2 control signals (a SWITCH1 first control signal and a SWITCH2 second control signal) output by the controller to the first relay disappear at the same time, the SET (single-phase current) position end and the RESET (RESET) RESET end of the first relay are consistent in voltage, the first relay is not switched, the COM (component object model) common end of the first relay is still tangential to the S1 end of the first relay after the system is powered down, namely, one end of a resistor R5 is connected with a power supply VCS;
after the power failure, 2 control signals (a third control signal of the SWICH3 and a fourth control signal of the SWICH 4) output by the CPU to the second relay disappear at the same time, and the power supply VCS still maintains existence for a certain time, so that the triode VT3 is turned on, the SET terminal voltage of the second relay is low, the RESET terminal voltage of the relay is high, the second relay performs a switching action, and the common terminal of the second relay COM outputs a switching signal for switching the initial signal;
the purpose that the output of the signal after power failure can be selected between the signal input 1 and the signal input 2 is achieved through the design of the circuit.
Here, as shown in fig. 5, the switching circuit is generally implemented by a relay, and when pin 1 of the bistable relay is at a low level and pin 11 of the bistable relay is at a high level, pin 6 and pin 20 of the bistable relay are conducted; when pin 1 of the bistable relay is at high level and pin 11 is at low level, pin 6 and pin 14 of the bistable relay are conducted.
When the controller controls the switching circuit provided by the invention to output a signal input 1 in an initial signal and the terminal S2 of the second relay is set to 20 pins, at this time, after the switching action is performed, the switching signal output by the common terminal COM of the second relay is a signal input 2;
further, an electronic device provided by the embodiment of the present invention includes the switching circuit as described above.
The electronic equipment applying the switching circuit can selectively output different signals according to preset, so that the electronic equipment is more flexible;
the electronic device provided by the embodiment of the invention has the same technical characteristics as the switching circuit provided by the embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved.
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 meanings of the above terms in the present invention can be understood in specific cases to 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", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular 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.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, 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: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A switching circuit is characterized by comprising a control module and a switching module connected with the control module, wherein the control module comprises a first relay, and the switching module comprises a second relay;
the control module is used for controlling the switching direction of the COM common end of the first relay in advance;
the switching module is used for controlling a COM common terminal of the second relay to output different signals according to the switching direction;
the control module further comprises a controller, an energy storage unit, a first control unit and a second control unit;
a first signal end of the controller is connected with one end of the first control unit, and the other end of the first control unit is respectively connected with one end of the energy storage unit and a set end of the first relay;
and a second signal end of the controller is connected with one end of the second control unit, and the other end of the second control unit is connected with the reset end of the first relay.
2. The switching circuit according to claim 1, wherein the COM common terminal of the first relay is connected to the switching module, the S1 terminal of the first relay and the other terminal of the energy storage unit are respectively connected to a power source VCS, and the S2 terminal of the first relay is floating.
3. The switching circuit of claim 1, wherein the switching module further comprises a controller, a resistor R5, a first switching unit, and a second switching unit;
a third signal end of the controller is respectively connected with the resistor R5 and one end of the first switching unit, the other end of the first switching unit is connected with a set end of the second relay, and the other end of the resistor R5 is connected with the control module;
and a fourth signal end of the controller is connected with one end of the second switching unit, and the other end of the second switching unit is connected with a reset end of the second relay.
4. The switching circuit according to claim 3, wherein the S1 of the second relay is terminated with a first input signal, the S2 of the second relay is terminated with a second input signal, and the COM common of the second relay outputs a different signal according to the switching direction.
5. The switching circuit according to claim 1, wherein the energy storage unit comprises a diode VD3, a capacitor C7, a capacitor C8 and a capacitor C9;
the anode of the diode VD3 is connected to the power VCC, the cathode of the diode VD3 is respectively connected to one end of the capacitor C7, the capacitor C8 and the capacitor C9 and the power VCS, and the other end of the capacitor C7, the other end of the capacitor C8 and the other end of the capacitor C9 are connected to the signal ground.
6. The switching circuit according to claim 1 or 3, wherein the control unit comprises a resistor R1, a resistor R2 and a transistor VT 1;
the signal end of controller with resistance R1's one end is connected, resistance R1's the other end with triode VT 1's base is connected, triode VT 1's emitter ground, triode VT 1's collecting electrode respectively with resistance R2's one end with first relay is connected, resistance R2's another termination power VCC.
7. The switching circuit according to claim 3 or 4, wherein the switching unit comprises a resistor R6, a resistor R7 and a transistor VT 3;
the signal end of the controller is connected with one end of a resistor R6, the other end of the resistor R6 is connected with the base electrode of the triode VT3, the emitting electrode of the triode VT3 is grounded, the collecting electrode of the triode VT3 is respectively connected with one end of a resistor R7 and the second relay, and the other end of the resistor R7 is connected with a power supply VCS.
8. The switching circuit of claim 1,
when the COM common end of the first relay is switched to the S2 end of the first relay, the COM common end of the second relay outputs an initial signal;
when the COM common end of the first relay is switched to the S1 end of the first relay, the second relay performs a switching operation, and the COM common end of the second relay outputs a switching signal.
9. An electronic device, characterized in that it comprises a switching circuit according to any one of claims 1-8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810318441.4A CN108347094B (en) | 2018-04-10 | 2018-04-10 | Switching circuit and electronic device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810318441.4A CN108347094B (en) | 2018-04-10 | 2018-04-10 | Switching circuit and electronic device |
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| CN108347094A CN108347094A (en) | 2018-07-31 |
| CN108347094B true CN108347094B (en) | 2020-04-17 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103914010A (en) * | 2014-01-21 | 2014-07-09 | 珠海柏卫宽带电子有限公司 | Radio-frequency change-over switch capable of keeping original communication state when powered off |
| CN104536321A (en) * | 2014-12-24 | 2015-04-22 | 深圳市亿威尔信息技术股份有限公司 | System and method for achieving power failure detection and relay state control |
| CN104617654A (en) * | 2014-11-25 | 2015-05-13 | 深圳大学 | Network bypass device and state setting method thereof |
| CN207200680U (en) * | 2017-09-21 | 2018-04-06 | 北京数码视讯科技股份有限公司 | Bistable relay exciting bank and electronic equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107332339B (en) * | 2016-04-28 | 2020-05-15 | 鸿富锦精密电子(天津)有限公司 | Power supply switching circuit and device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103914010A (en) * | 2014-01-21 | 2014-07-09 | 珠海柏卫宽带电子有限公司 | Radio-frequency change-over switch capable of keeping original communication state when powered off |
| CN104617654A (en) * | 2014-11-25 | 2015-05-13 | 深圳大学 | Network bypass device and state setting method thereof |
| CN104536321A (en) * | 2014-12-24 | 2015-04-22 | 深圳市亿威尔信息技术股份有限公司 | System and method for achieving power failure detection and relay state control |
| CN207200680U (en) * | 2017-09-21 | 2018-04-06 | 北京数码视讯科技股份有限公司 | Bistable relay exciting bank and electronic equipment |
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