CN104052146B - A kind of power control system and its implementation - Google Patents
A kind of power control system and its implementation Download PDFInfo
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- CN104052146B CN104052146B CN201310080404.1A CN201310080404A CN104052146B CN 104052146 B CN104052146 B CN 104052146B CN 201310080404 A CN201310080404 A CN 201310080404A CN 104052146 B CN104052146 B CN 104052146B
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Abstract
The invention discloses a kind of power control system and its implementation, including：First input end, the second input, output end, first switch module, second switch module, the 3rd switch module and the 4th switch module, first switch module is connected between first input end and output end, second switch module is connected between the second input and output end, 3rd switch module is connected between first input end and second switch module, and the 4th switch module is connected between second switch control module and second switch module.The break-make of first switch control module control first switch module, the 3rd switch module and the 4th switch module, second switch control module controls the break-make of second switch module according to the break-make of wake-up signal and the 4th switch module, so as to control the power supply mode of power control system.Seamless switching is internally carried out between power supply and external power source by the above-mentioned means, can realize, avoids filling electricity between external power source and internal electric source mutually.
Description
Technical field
The present invention relates to power supply field, more particularly to a kind of power control system and its implementation.
Background technology
With the development of internet and mobile Internet, the requirement to network security steps up, and merges RTC（Real-
Time communication, real-time communication）3rd generation USB KEY technologies of technology and 2 generation USB KEY technologies possess higher
Security.But the technology has problem in power supply switching control, i.e., do not support between battery powered and external interface power supply
Seamless switching is carried out, and power-off wake-up can not be carried out during battery powered.
The content of the invention
The present invention solves the technical problem of a kind of power control system and its implementation is provided, can realize
Internal electric source is powered and carries out seamless switching between external power source power supply, avoids filling electricity between external power source and internal electric source mutually,
And power-off awakening mode is supported when internally power supply is powered.
In order to solve the above technical problems, one aspect of the present invention is to provide a kind of power control system, bag
Include：First input end, the second input, output end, first switch module, second switch module, the 3rd switch module, the 4th open
Module, first switch control module and second switch control module are closed, wherein first input end is used to connect external power source, the
Two inputs are used to connect internal electric source, and first switch module is connected between first input end and output end, second switch mould
Block is connected between the second input and output end, the 3rd switch module be connected to first input end and second switch module it
Between, the 4th switch module is connected between second switch control module and second switch module, the connection of first switch control module
First input end, the second input, first switch module, the 3rd switch module and the 4th switch module, second switch control
Module connects the second input, and receives a wake-up signal, when outer power voltage, the second input on first input end being present
On when internal power source voltage be present, first switch control module control first switch module and the conducting of the 3rd switch module, and control
The cut-off of the 4th switch module is made, to cause outer power voltage to be exported through first switch module to output end, and through the 3rd switch
Module control second switch module cut-off, when outer power voltage is not present on first input end, exist on the second input interior
During portion's supply voltage, first switch control module control first switch module and the cut-off of the 3rd switch module, and control the 4th to open
Module conducting is closed, second switch control module exports wake-up signal to second switch module through the 4th switch module, with by calling out
Signal of waking up controls second switch module on or off.
Wherein, first switch module, second switch module, the 3rd switch module and the 4th switch module are included at least respectively
One switch element and at least a reverse isolation element, reverse isolation element are used to prevent electric current through switch element reverse circulated.
Wherein, power control system further comprises voltage transformation module, and voltage transformation module is connected to first switch mould
Between block and output end, to carry out voltage conversion to the outer power voltage exported through first switch module.
Wherein, first switch module includes the first PMOS and the second PMOS, the drain electrode of the first PMOS and second
The drain electrode connection of PMOS, the source electrode connection first input end of the first PMOS, the source electrode connection output end of the second PMOS, the
One PMOS connects first switch control module with the grid of the second PMOS.
Wherein, second switch module includes the 3rd PMOS and the 4th PMOS, the drain electrode and the 4th of the 3rd PMOS
The drain electrode connection of PMOS, the source electrode of the 3rd PMOS connect the second input, and the source electrode of the 4th PMOS connects output end, the
Three PMOSs connect the 3rd switch module and the 4th switch module with the grid of the 4th PMOS.
Wherein, the 3rd switch module includes the 5th PMOS and the 6th PMOS, the drain electrode and the 6th of the 5th PMOS
The drain electrode connection of PMOS, the source electrode connection first input end of the 5th PMOS, the source electrode of the 6th PMOS connect the 3rd PMOS
The grid of pipe and the 4th PMOS, the 5th PMOS connect first switch control module with the grid of the 6th PMOS.
Wherein, the 4th switch module includes the 7th PMOS, the 8th PMOS and the first NMOS tube, the 7th PMOS
Drain electrode is connected with the drain electrode of the 8th PMOS, and the source electrode of the 7th PMOS connects the drain electrode of the first NMOS tube, the 8th PMOS
Source electrode and the source electrode of the first NMOS tube connect the grid of the 3rd PMOS and the 4th PMOS, the 7th PMOS and the 8th PMOS
Grid connection first input end, the first NMOS tube grid connection first switch control module, second switch control module will
Wake-up signal is inputted to the drain electrode of the first NMOS tube.
Wherein, first switch control module includes first resistor, second resistance and the second NMOS tube, one end of first resistor
Connect first input end, the other end ground connection of first resistor, one end of second resistance connects the second input, second resistance it is another
One end connects the drain electrode of the second NMOS tube, the source ground of the second NMOS tube, and the grid of the second NMOS tube connects first input end,
First PMOS, the second PMOS, the 5th PMOS, the grid of the 6th PMOS and the first NMOS tube are connected to second resistance
The other end and the second NMOS tube drain electrode between.
Wherein, internal electric source is battery supply.
In order to solve the above technical problems, another technical solution used in the present invention is to provide a kind of power control system
Implementation method, wherein, power control system includes first input end, the second input, output end, first switch module, second
Switch module, the 3rd switch module and the 4th switch module, first switch module are connected between first input end and output end,
Second switch module is connected between the second input and output end, and the 3rd switch module is connected to first input end and opened with second
Between closing module, the 4th switch module is connected between wake-up signal and second switch module, and its method comprises the following steps：
Detect the state of first input end and the second input；
If outer power voltage on first input end be present, internal power source voltage on the second input be present, then control
One switch module and the conducting of the 3rd switch module, and the cut-off of the 4th switch module is controlled, to cause outer power voltage through first
Switch module is exported to output end, and controls the cut-off of second switch module through the 3rd switch module；
When outer power voltage is not present on first input end, internal power source voltage be present on the second input, control
First switch module and the cut-off of the 3rd switch module, and the conducting of the 4th switch module is controlled, make wake-up signal through the 4th switching molding
Block is exported to second switch module, to control second switch module on or off by wake-up signal.
The beneficial effects of the invention are as follows：The situation of prior art is different from, the present invention passes through first switch control module control
The break-make of first switch module processed, the 3rd switch module and the 4th switch module, and second switch control module is according to wake-up
The break-make of signal and the 4th switch module controls the break-make of second switch module, so as to control the supplier of electricity of power control system
Formula, external power source and internal electric source can be avoided to fill electricity mutually, and can internally power carried out between externally fed it is seamless
Switching.
Brief description of the drawings
Fig. 1 is the structural representation of the power control system of first embodiment of the invention；
Fig. 2 is the circuit diagram of the power control system of first embodiment of the invention；
Fig. 3 is the schematic diagram of the implementation method of the power control system of first embodiment of the invention；
Embodiment
Referring to Fig. 1, Fig. 1 is the structural representation of the power control system of first embodiment of the invention.As shown in figure 1,
Power control system includes：First input end 100, the second input 118, output end 106, first switch module 11, second open
Close module 12, the 3rd switch module 13, the 4th switch module 14, first switch control module 107 and second switch control mould
Block 110.
In the present embodiment, first input end 100 is used to connect external power source, and the second input 118 is used to connect inside
Power supply, first switch module 11 are connected between first input end 100 and output end 106, and second switch module 12 is connected to
Between two inputs 118 and output end 106, the 3rd switch module 13 is connected to first input end 100 and second switch module 12
Between, the 4th switch module 14 is connected between second switch control module 110 and second switch module 12, first switch control
Module 107 connects first input end 100, the second input 118, first switch module 11, the 3rd switch module 13 and the 4th
Switch module 14, second switch control module 110 connects the second input 118, and receives a wake-up signal and defeated from port 122
Go out to port 123.When outer power voltage on first input end 100 be present, internal power source voltage be present on the second input 118
When, first switch control module 107 controls first switch module 11 and the 3rd switch module 13 to turn on, and controls the 4th switching molding
Block 14 ends, to cause outer power voltage to be exported through first switch module 11 to output end 106, and through the 3rd switch module 13
Control second switch module 12 is ended, and when outer power voltage is not present on first input end 100, is deposited on the second input 118
Internally during supply voltage, first switch control module 107 controls first switch module 11 and the 3rd switch module 13 to end, and
The 4th switch module 14 is controlled to turn on, second switch control module 110 exports wake-up signal to through the 4th switch module 14
Two switch modules 12, to control the on or off of second switch module 12 by wake-up signal.
In the present embodiment, power control system further comprises voltage transformation module 105, and voltage transformation module 105 connects
It is connected between first switch module 11 and output end 106, to be carried out to the outer power voltage exported through first switch module 11
Voltage conversion.
In the present embodiment, first switch module 11 preferably includes the reverse isolation element of first switching element 101 and first
103, second switch module 12 includes the reverse isolation element 121 of second switch element 119 and second, and the 3rd switch module 13 includes
3rd switch element 111 and the 3rd reverse isolation element 113, the 4th switch module 14 include the 4th switch element 112 and the 4th
Reverse isolation element 116.Wherein, the first reverse isolation element 103, the second reverse isolation element 121, the 3rd reverse isolation element
113 and the 4th reverse isolation element 116 be used to prevent the reverse circulated of electric current.
In the present embodiment, Fig. 1 concrete operating principle is as follows：
When outer power voltage on first input end 100 being present, internal power source voltage being present on the second input 118,
First switch control module 107 controls the reverse isolation element 103 of first switching element 101 and first to turn on, outer power voltage
Exported by the reverse isolation element 103 of first switching element 101 and first to port 104, voltage transformation module 105 is by external electrical
Source voltage conversion be normal working voltage after exported through output end 106.Meanwhile the control of first switch control module 107 the 3rd is opened
Close that the reverse isolation element 113 of element 111 and the 3rd is turned on and the 4th switch element 112 and the 4th reverse isolation element 116 are cut
Only, and then second switch element 119 and the second reverse isolation element 121 is controlled to end, the second input 118 arrives output end 106
Supply access be truncated.When outer power voltage is not present on first input end 100, inside be present on the second input 118
During supply voltage, first switch control module 107 controls the reverse isolation element 103 of first switching element 101 and first to end, the
One input 100 is truncated to the supply access of output end 106.Meanwhile the switch member of the control of first switch control module 107 the 3rd
The reverse isolation element 113 of part 111 and the 3rd ends and the 4th switch element 112 and the 4th reverse isolation element 116 turn on, and calls out
Signal of waking up is exported to port through second switch control module 110, the 4th switch element 112 and the 4th reverse isolation element 116
117, and then the break-make of second switch element 119 and the second reverse isolation element 121 is controlled, it is internal so as to be determined by wake-up signal
Whether power supply through the reverse isolation element 121 of second switch element 119 and second is transferred to output end 106.In the present embodiment, it is interior
Portion's power supply is preferably battery supply.
Fig. 2 is the circuit diagram of the power control system of first embodiment of the invention.As shown in Fig. 2 first switch module 11
Including the first PMOS 201 and the second PMOS 202, the first PMOS 201 is used as switch element, the conduct of the second PMOS 202
Reverse isolation element.The drain electrode of first PMOS 201 is connected with the drain electrode of the second PMOS 202, the source electrode of the first PMOS 201
First input end 100 is connected, the source electrode of the second PMOS 202 connects output end 106, the first PMOS through voltage transformation module 105
Pipe 201 connects first switch control module 107 with the grid of the second PMOS 202.
In the present embodiment, second switch module 12 includes the 3rd PMOS 203 and the 4th PMOS 204, the 3rd PMOS
Pipe 203 is used as switch element, and the 4th PMOS 204 is used as reverse isolation element.The drain electrode of 3rd PMOS 203 and the 4th PMOS
The drain electrode connection of pipe 204, the source electrode of the 3rd PMOS 203 connect the second input 118, the source electrode connection of the 4th PMOS 204
Output end 106, the 3rd PMOS 203 connect the 3rd switch module 13 and the 4th switch module with the grid of the 4th PMOS 204
14。
In the present embodiment, the 3rd switch module 13 includes the 5th PMOS 205 and the 6th PMOS 206, the 5th PMOS
Pipe 205 is used as switch element, and the 6th PMOS 206 is used as reverse isolation element.The drain electrode of 5th PMOS 205 and the 6th PMOS
The drain electrode connection of pipe 206, the source electrode connection first input end 100 of the 5th PMOS 205, the source electrode connection of the 6th PMOS 206
The grid of 3rd PMOS 203 and the 4th PMOS 204, the 5th PMOS 205 connect first with the grid of the 6th PMOS 206
Switch control module 107.
In the present embodiment, the 4th switch module 14 includes the 7th PMOS 207, the 8th PMOS 208 and the first NMOS
Pipe 209, the 7th PMOS 207 and the first NMOS tube 209 are used as switch element, and the 8th PMOS 208 is used as reverse isolation element.
The drain electrode of 7th PMOS 207 is connected with the drain electrode of the 8th PMOS 208, and the source electrode of the 7th PMOS 207 connects the first NMOS
The source electrode of the drain electrode of pipe 209, the Substrate ground of the first NMOS tube 209, the source electrode of the 8th PMOS 208 and the first NMOS tube 209
The grid of the 3rd PMOS 203 and the 4th PMOS 204 is connected, the 7th PMOS 207 connects with the grid of the 8th PMOS 208
First input end 100, the grid connection first switch control module 107 of the first NMOS tube 209, second switch control module 110
Wake-up signal rtc_wkup is inputted to the drain electrode of the first NMOS tube 209.
In the present embodiment, first switch control module 107 includes first resistor 211, the NMOS of second resistance 212 and the 2nd
Pipe 210.One end connection first input end 100 of first resistor 211, the other end ground connection of first resistor 211, second resistance 212
One end connect the second input 118, the other end of second resistance 212 connects the drain electrode of the second NMOS tube 210, the second NMOS tube
210 source ground, the grid connection first input end 100 of the second NMOS tube 210, the first PMOS 201, the second PMOS
202nd, the grid of the 5th PMOS 203, the 6th PMOS 206 and the first NMOS tube 209 is connected to the another of second resistance 212
Between end and the drain electrode of the second NMOS tube 210.
In the present embodiment, Fig. 2 is described in detail as follows：
When the outer power voltage V_USB that first input end 100 inputs is V0, the inside of the second input 118 input is electric
When source voltage VCC_BAT is V1, the second NMOS tube 210 turns on, and the drain voltage VS_USB of the second NMOS tube 210 is low level,
Therefore, the first PMOS 201 and the second PMOS 202 turn on, and outer power voltage V_USB changes through voltage transformation module 105
To be powered after normal working voltage by the output of output end 106.Now, the 7th PMOS 207, the 8th PMOS 208 and
First NMOS tube 209 is ended, to prevent external power source fills electricity from arriving wake-up signal rtc_wkup.And the 5th PMOS 205 and the 6th
PMOS 206 is turned on, and VS_BAT is high level, and the 3rd PMOS 203 and the 4th PMOS 204 are ended, and internal electric source can not be for
Electricity.To prevent external power source reversely fills electricity from arriving internal electric source, VS_BAT voltage need to be higher than VCC_BAT voltage.
When the outer power voltage V_USB that first input end 100 inputs is 0V, the inside of the second input 118 input is electric
When source voltage VCC_BAT is V1, the second NMOS tube 210 is ended, and VS_USB is high level, therefore, the first PMOS 201 and second
PMOS 202 is ended, and external power source can not power.And the 5th PMOS 205 and the 6th PMOS 206 are ended, the 7th PMOS
207th, the 8th PMOS 208 and the first NMOS tube 209 turn on.To prevent internal electric source reversely fills electricity from arriving external power source, VS_
USB voltage need to be VCC_BAT.Second switch control module 110 is internally in the presence of power supply and wake-up signal rtc_wkup0
Produce wake-up signal rtc_wkup.Wake-up signal rtc_wkup passes through the 7th PMOS 207 and the 8th PMOS 208 or first
NMOS tube 209 is transferred to the grid of the 3rd PMOS 203 and the 4th PMOS 204.When wake-up signal rtc_wkup is 0V, the
The grid voltage VS_BAT of three PMOSs 203 and the 4th PMOS 204 is 0V, and the 3rd PMOS 203 and the 4th PMOS 204 are led
Logical, internal power source voltage VCC_BAT is transmitted to output end 106 and is powered.When wake-up signal rtc_wkup is VCC_BAT,
The grid voltage VS_BAT of 3rd PMOS 203 and the 4th PMOS 204 is VCC_BAT, the 3rd PMOS 203 and the 4th PMOS
Pipe 204 ends, and power control system enters powered down sleep state.To prevent wake-up signal rtc_wkup voltage VCC_BAT anti-
External power source is arrived to electricity is filled, in its path（That is the 4th switch module 14）On add reverse isolation element and carry out shut-off control.
The present invention also provides the implementation method of the power control system of first embodiment.Wherein, power control system includes
First input end, the second input, output end, first switch module, second switch module, the 3rd switch module and the 4th switch
Module, first switch module are connected between first input end and output end, second switch module be connected to the second input with
Between output end, the 3rd switch module is connected between first input end and second switch module, and the 4th switch module is connected to
Between wake-up signal and second switch module.As shown in figure 3, its method comprises the following steps：
Detect the state of first input end and the second input；
If outer power voltage on first input end be present, internal power source voltage on the second input be present, then control
One switch module and the conducting of the 3rd switch module, and the cut-off of the 4th switch module is controlled, to cause outer power voltage through first
Switch module is exported to output end, and controls the cut-off of second switch module through the 3rd switch module.
When outer power voltage is not present on first input end, internal power source voltage be present on the second input, control
First switch module and the cut-off of the 3rd switch module, and the conducting of the 4th switch module is controlled, make wake-up signal through the 4th switching molding
Block is exported to second switch module, to control second switch module on or off by wake-up signal.When wake-up signal is 0V,
Second switch module is turned on, and internal electric source is exported to output end through second switch module and is powered；When wake-up signal is not 0V
When, power control system enters powered down sleep state.
In summary, power control system of the invention controls first switch module, the by first switch control module
The break-make of three switch modules and the 4th switch module, second switch control module is according to wake-up signal and the 4th switch module
Break-make controls the break-make of second switch module, so as to controlling the power supply mode of power control system.By the above-mentioned means, can
Realize and carry out seamless switching between power supply internally and external power source power supply, avoid filling mutually between external power source and internal electric source
Electricity, and power-off awakening mode is supported during power supply internally.
Embodiments of the invention are the foregoing is only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (10)
- A kind of 1. power control system, it is characterised in that the power control system include first input end, the second input, Output end, first switch module, second switch module, the 3rd switch module, the 4th switch module, first switch control module with And second switch control module, wherein the first input end is used to connect external power source, second input is used to connect Internal electric source, the first switch module are connected between the first input end and the output end, the second switch mould Block is connected between second input and the output end, the 3rd switch module be connected to the first input end with Between the second switch module, the 4th switch module is connected to the second switch control module and the second switch Between module, the first switch control module connects the first input end, second input, the first switch mould Block, the 3rd switch module and the 4th switch module, second switch control module connection second input End, and a wake-up signal is received, when outer power voltage on the first input end be present, exist on second input interior During portion's supply voltage, the first switch control module controls the first switch module and the 3rd switch module conducting, And control the 4th switch module to end, to cause the outer power voltage to be exported through the first switch module to described Output end, and control the second switch module to end through the 3rd switch module, it is not present when on the first input end Outer power voltage, when internal power source voltage be present on second input, described in the first switch control module control First switch module and the 3rd switch module cut-off, and control the 4th switch module to turn on, the second switch control Molding block exports the wake-up signal to the second switch module through the 4th switch module, with by the wake-up signal Control the second switch module on or off.
- 2. power control system according to claim 1, it is characterised in that the first switch module, described second open Close module, the 3rd switch module and the 4th switch module include respectively an at least switch element and at least one reversely every From element, the reverse isolation element is used to prevent electric current through the switch element reverse circulated.
- 3. power control system according to claim 1, it is characterised in that the power control system further comprises electricity Modular converter is pressed, the voltage transformation module is connected between the first switch module and the output end, with to described in warp The outer power voltage of first switch module output carries out voltage conversion.
- 4. power control system according to claim 1, it is characterised in that the first switch module includes the first PMOS Pipe and the second PMOS, the drain electrode of first PMOS are connected with the drain electrode of second PMOS, first PMOS Source electrode connect the first input end, the source electrode of second PMOS connects the output end, first PMOS and The grid of second PMOS connects the first switch control module.
- 5. power control system according to claim 4, it is characterised in that the second switch module includes the 3rd PMOS Pipe and the 4th PMOS, the drain electrode of the 3rd PMOS are connected with the drain electrode of the 4th PMOS, the 3rd PMOS Source electrode connect second input, the source electrode of the 4th PMOS connects the output end, the 3rd PMOS and The grid of 4th PMOS connects the 3rd switch module and the 4th switch module.
- 6. power control system according to claim 5, it is characterised in that the 3rd switch module includes the 5th PMOS Pipe and the 6th PMOS, the drain electrode of the 5th PMOS are connected with the drain electrode of the 6th PMOS, the 5th PMOS Source electrode connect the first input end, the source electrode of the 6th PMOS connects the 3rd PMOS and the 4th PMOS The grid of pipe, the 5th PMOS connect the first switch control module with the grid of the 6th PMOS.
- 7. power control system according to claim 6, it is characterised in that the 4th switch module includes the 7th PMOS Pipe, the 8th PMOS and the first NMOS tube, the drain electrode of the 7th PMOS are connected with the drain electrode of the 8th PMOS, institute The source electrode for stating the 7th PMOS connects the drain electrode of first NMOS tube, the source electrode and the first NMOS of the 8th PMOS The source electrode of pipe connects the grid of the 3rd PMOS and the 4th PMOS, the 7th PMOS and the 8th PMOS The grid connection first input end, the grid connection first switch control module of first NMOS tube, described second Switch control module inputs the wake-up signal to the drain electrode of first NMOS tube.
- 8. power control system according to claim 7, it is characterised in that the first switch control module includes first Resistance, second resistance and the second NMOS tube, one end of the first resistor connect the first input end, the first resistor The other end is grounded, one end connection second input of the second resistance, described in the other end connection of the second resistance The drain electrode of second NMOS tube, the source ground of second NMOS tube, the grid connection described first of second NMOS tube are defeated Enter end, first PMOS, second PMOS, the 5th PMOS, the 6th PMOS and described first The grid of NMOS tube is connected between the other end of the second resistance and the drain electrode of second NMOS tube.
- 9. according to the power control system described in claim 1-8 any one, it is characterised in that the internal electric source is battery Power supply.
- A kind of 10. implementation method of power control system, it is characterised in that the power control system include first input end, Second input, output end, first switch module, second switch module, the 3rd switch module and the 4th switch module, described One switch module is connected between the first input end and the output end, and the second switch module is connected to described second Between input and the output end, the 3rd switch module is connected to the first input end and the second switch module Between, the 4th switch module is connected between wake-up signal and the second switch module, and methods described includes following step Suddenly：Detect the state of the first input end and second input；If outer power voltage on the first input end be present, internal power source voltage be present on second input, then control The first switch module and the 3rd switch module conducting are made, and controls the 4th switch module to end, to cause State outer power voltage to export to output end through the first switch module, and second switch is controlled through the 3rd switch module Module is ended；When outer power voltage is not present on the first input end, internal power source voltage be present on second input, Control the first switch module and the 3rd switch module to end, and control the 4th switch module to turn on, make described Wake-up signal is exported to the second switch module through the 4th switch module, to control described second by the wake-up signal Switch module on or off.
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| CN107729785B (en) * | 2017-10-24 | 2021-02-02 | 深圳成谷科技有限公司 | Highway passing card |
| CN108888257B (en) * | 2018-04-28 | 2024-03-19 | 无锡商业职业技术学院 | Multi-parameter wearable health detection equipment based on shared electrode |
| CN118487256A (en) * | 2024-07-09 | 2024-08-13 | 安徽容知日新科技股份有限公司 | Intelligent sensor and sensor chain |
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|---|---|---|---|---|
| CN101593999A (en) * | 2008-05-30 | 2009-12-02 | 上海耀华称重系统有限公司 | A kind of civil power and battery powered automatic switch-over circuit |
| CN202363960U (en) * | 2011-08-18 | 2012-08-01 | 上海韦尔半导体股份有限公司 | Double-battery power supply device |
| CN202260609U (en) * | 2011-08-26 | 2012-05-30 | 维用国际股份有限公司 | Power supply switching device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104052146A (en) | 2014-09-17 |
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