CN104052146A - Power supply control system and realization method thereof - Google Patents
Power supply control system and realization method thereof Download PDFInfo
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- CN104052146A CN104052146A CN201310080404.1A CN201310080404A CN104052146A CN 104052146 A CN104052146 A CN 104052146A CN 201310080404 A CN201310080404 A CN 201310080404A CN 104052146 A CN104052146 A CN 104052146A
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Abstract
The invention discloses a power supply control system and a realization method thereof. The power supply control system consists of a first input terminal, a second input terminal, an output terminal, a first switch module, a second switch module, a third switch module, and a fourth switch module. The first switch module is connected between the first input terminal and the output terminal; the second switch module is connected between second input terminal and the output terminal; the third switch module is connected between the first input terminal and the second switch module; and the fourth switch module is connected between a second switch control module and the second switch module. A first switch control module controls on and off of the first switch module, the third switch module, and the fourth switch module; and the second switch control module control on and off the second switch module according to a wake-up signal and the on and off of the fourth switch module, thereby controlling the power supply mode of the power supply control system. On the basis of the mode, seamless switching between the internal power supply and the external power supply is realized, thereby avoiding mutual current pouring between the external power supply and the internal power supply.
Description
Technical field
The present invention relates to power supply control field, particularly relate to a kind of power control system and its implementation.
Background technology
Along with the development of the Internet and mobile Internet, the requirement of network security is progressively improved, merging RTC(Real-time communication, real-time communication) the 3rd generation USB KEY technology of technology and 2 generation USB KEY technology possesses higher fail safe.But this technology is existing problems on electrical source exchange is controlled, be not supported in powered battery and carry out seamless switching between powering with external interface, and can not carry out power-off during powered battery and wake up.
Summary of the invention
The technical problem that the present invention mainly solves is to provide a kind of power control system and its implementation, can realize between internal electric source power supply and external power source and carry out seamless switching, avoid filling with mutually between external power source and internal electric source electric, and when internal electric source is powered, support power-off awakening mode.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is to provide a kind of power control system, comprise: first input end, the second input, output, the first switch module, second switch module, the 3rd switch module, the 4th switch module, the first switch control module and second switch control module, wherein first input end is used for connecting external power source, the second input is used for connecting internal electric source, the first switch module is connected between first input end and output, second switch module is connected between the second input and output, the 3rd switch module is connected between first input end and second switch module, the 4th switch module is connected between second switch control module and second switch module, the first switch control module connects first input end, the second input, the first switch module, the 3rd switch module and the 4th switch module, second switch control module connects the second input, and receive a wake-up signal, on first input end, there is outer power voltage, while there is internal power source voltage on the second input, the first switch control module is controlled the first switch module and the 3rd switch module conducting, and control the 4th switch module and end, so that outer power voltage exports output to through the first switch module, and control the cut-off of second switch module through the 3rd switch module, on first input end, there is not outer power voltage, while there is internal power source voltage on the second input, the first switch control module is controlled the first switch module and the cut-off of the 3rd switch module, and control the 4th switch module conducting, second switch control module exports wake-up signal to second switch module through the 4th switch module, to control second switch module conducting or cut-off by wake-up signal.
Wherein, the first switch module, second switch module, the 3rd switch module and the 4th switch module comprise respectively at least one switch element and at least one reverse isolation element, and reverse isolation element is used for preventing that electric current is through switch element reverse circulated.
Wherein, power control system further comprises voltage transformation module, and voltage transformation module is connected between the first switch module and output, with the outer power voltage to through the first switch module output, carries out voltage transitions.
Wherein, the first switch module comprises a PMOS pipe and the 2nd PMOS pipe, the drain electrode of the one PMOS pipe is connected with the drain electrode of the 2nd PMOS pipe, the source electrode of the one PMOS pipe connects first input end, the source electrode of the 2nd PMOS pipe connects output, and a PMOS pipe is connected the first switch control module with the grid of the 2nd PMOS pipe.
Wherein, second switch module comprises the 3rd PMOS pipe and the 4th PMOS pipe, the drain electrode of the 3rd PMOS pipe is connected with the drain electrode of the 4th PMOS pipe, the source electrode of the 3rd PMOS pipe connects the second input, the source electrode of the 4th PMOS pipe connects output, and the 3rd PMOS pipe is connected the 3rd switch module and the 4th switch module with the grid of the 4th PMOS pipe.
Wherein, the 3rd switch module comprises the 5th PMOS pipe and the 6th PMOS pipe, the drain electrode of the 5th PMOS pipe is connected with the drain electrode of the 6th PMOS pipe, the source electrode of the 5th PMOS pipe connects first input end, the source electrode of the 6th PMOS pipe connects the grid of the 3rd PMOS pipe and the 4th PMOS pipe, and the 5th PMOS pipe is connected the first switch control module with the grid of the 6th PMOS pipe.
Wherein, the 4th switch module comprises the 7th PMOS pipe, the 8th PMOS pipe and NMOS pipe, the drain electrode of the 7th PMOS pipe is connected with the drain electrode of the 8th PMOS pipe, the source electrode of the 7th PMOS pipe connects the drain electrode of a NMOS pipe, the source electrode of the source electrode of the 8th PMOS pipe and a NMOS pipe is connected the grid of the 3rd PMOS pipe and the 4th PMOS pipe, the 7th PMOS pipe is connected first input end with the grid of the 8th PMOS pipe, the grid of the one NMOS pipe connects the first switch control module, and second switch control module inputs to wake-up signal the drain electrode of the one NMOS pipe.
Wherein, the first switch control module comprises the first resistance, the second resistance and the 2nd NMOS pipe, one end of the first resistance connects first input end, the other end ground connection of the first resistance, one end of the second resistance connects the second input, the other end of the second resistance connects the drain electrode of the 2nd NMOS pipe, the source ground of the 2nd NMOS pipe, the grid of the 2nd NMOS pipe connects first input end, and the grid of a PMOS pipe, the 2nd PMOS pipe, the 5th PMOS pipe, the 6th PMOS pipe and a NMOS pipe is connected between the other end of the second resistance and the drain electrode of the 2nd NMOS pipe.
Wherein, internal electric source is battery supply.
For solving the problems of the technologies described above, another technical solution used in the present invention is to provide a kind of implementation method of power control system, wherein, power control system comprises first input end, the second input, output, the first switch module, second switch module, the 3rd switch module and the 4th switch module, the first switch module is connected between first input end and output, second switch module is connected between the second input and output, the 3rd switch module is connected between first input end and second switch module, the 4th switch module is connected between wake-up signal and second switch module, its method comprises the following steps:
Detect the state of first input end and the second input;
If there is outer power voltage on first input end, on the second input, there is internal power source voltage, control the first switch module and the 3rd switch module conducting, and control the 4th switch module and end, so that outer power voltage exports output to through the first switch module, and control the cut-off of second switch module through the 3rd switch module;
On first input end, there is not outer power voltage, while there is internal power source voltage on the second input, control the first switch module and the cut-off of the 3rd switch module, and control the 4th switch module conducting, make wake-up signal export second switch module to through the 4th switch module, to control second switch module conducting or cut-off by wake-up signal.
The invention has the beneficial effects as follows: the situation that is different from prior art, the present invention controls the break-make of the first switch module, the 3rd switch module and the 4th switch module by the first switch control module, and second switch control module is controlled the break-make of second switch module according to the break-make of wake-up signal and the 4th switch module, thereby control the supply power mode of power control system, can avoid external power source and internal electric source to fill with mutually electricity, and can between in-line power and externally fed, carry out seamless switching.
Accompanying drawing explanation
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 implementation method of the power control system of first embodiment of the invention;
Embodiment
Refer 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 comprises: first input end 100, the second input 118, output 106, the first switch module 11, second switch module 12, the 3rd switch module 13, the 4th switch module 14, the first switch control module 107 and second switch control module 110.
In the present embodiment, first input end 100 is for connecting external power source, the second input 118 is for connecting internal electric source, the first switch module 11 is connected between first input end 100 and output 106, second switch module 12 is connected between the second input 118 and output 106, the 3rd switch module 13 is connected between first input end 100 and second switch module 12, the 4th switch module 14 is connected between second switch control module 110 and second switch module 12, the first switch control module 107 connects first input end 100, the second input 118, the 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 receive a wake-up signal and output to port one 23 from port one 22.On first input end 100, there is outer power voltage, while there is internal power source voltage on the second input 118, the first switch control module 107 is controlled the first switch module 11 and the 3rd switch module 13 conductings, and control the 4th switch module 14 and end, so that outer power voltage exports output 106 to through the first switch module 11, and control 12 cut-offs of second switch module through the 3rd switch module 13, on first input end 100, there is not outer power voltage, while there is internal power source voltage on the second input 118, the first switch control module 107 is controlled the first switch module 11 and the 3rd switch module 13 cut-offs, and control the 4th switch module 14 conductings, second switch control module 110 exports wake-up signal to second switch module 12 through the 4th switch module 14, to control second switch module 12 conductings or cut-off by wake-up signal.
In the present embodiment, power control system further comprises voltage transformation module 105, and voltage transformation module 105 is connected between the first switch module 11 and output 106, with the outer power voltage to through the first switch module 11 outputs, carries out voltage transitions.
In the present embodiment, the first switch module 11 preferably includes the first switch element 101 and the first reverse isolation element 103, second switch module 12 comprises second switch element 119 and the second reverse isolation element 121, the 3rd switch module 13 comprises that the 3rd switch element 111 and the 3rd reverse isolation element 113, the four switch modules 14 comprise 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 are for preventing the reverse circulated of electric current.
In the present embodiment, the specific works principle of Fig. 1 is as follows:
On first input end 100, there is outer power voltage, while there is internal power source voltage on the second input 118, the first switch control module 107 is controlled the first switch element 101 and the first reverse isolation element 103 conductings, outer power voltage exports port one 04 to through the first switch element 101 and the first reverse isolation element 103, and voltage transformation module 105 is converted to normal working voltage by output 106 outputs by outer power voltage.Simultaneously, the first switch control module 107 is controlled the 3rd switch element 111 and the 3rd reverse isolation element 113 conductings and the 4th switch element 112 and the 4th reverse isolation element 116 cut-offs, and then control second switch element 119 and the second reverse isolation element 121 cut-offs, the second input 118 is truncated to the supply access of output 106.On first input end 100, there is not outer power voltage, while there is internal power source voltage on the second input 118, the first switch control module 107 is controlled the first switch element 101 and the first reverse isolation element 103 cut-offs, and first input end 100 is truncated to the supply access of output 106.Simultaneously, the first switch control module 107 is controlled the 3rd switch element 111 and the 3rd reverse isolation element 113 cut-off and the 4th switch element 112 and the 4th reverse isolation element 116 conductings, wake-up signal exports port one 17 to through second switch control module 110, the 4th switch element 112 and the 4th reverse isolation element 116, and then the break-make of control second switch element 119 and the second reverse isolation element 121, thereby determine by wake-up signal whether internal electric source is transferred to output 106 through second switch element 119 and the second reverse isolation element 121.In the present embodiment, internal electric source is preferably battery supply.
Fig. 2 is the circuit diagram of the power control system of first embodiment of the invention.As shown in Figure 2, the first switch module 11 comprises that PMOS pipe the 201 and the 2nd PMOS pipe 202, the one PMOS pipes 201 are as switch element, and the 2nd PMOS pipe 202 is as reverse isolation element.The drain electrode of the one PMOS pipe 201 is connected with the drain electrode of the 2nd PMOS pipe 202, the source electrode of the one PMOS pipe 201 connects first input end 100, the source electrode of the 2nd PMOS pipe 202 connects output 106, the one PMOS pipes 201 through voltage transformation module 105 and is connected the first switch control module 107 with the grid of the 2nd PMOS pipe 202.
In the present embodiment, second switch module 12 comprises that the 3rd PMOS pipe the 203 and the 4th PMOS pipe 204, the three PMOS pipes 203 are as switch element, and the 4th PMOS pipe 204 is as reverse isolation element.The drain electrode of the 3rd PMOS pipe 203 is connected with the drain electrode of the 4th PMOS pipe 204, the source electrode of the 3rd PMOS pipe 203 connects the second input 118, the source electrode of the 4th PMOS pipe 204 connects output 106, the three PMOS pipes 203 and is connected the 3rd switch module 13 and the 4th switch module 14 with the grid of the 4th PMOS pipe 204.
In the present embodiment, the 3rd switch module 13 comprises that the 5th PMOS pipe the 205 and the 6th PMOS pipe 206, the five PMOS pipes 205 are as switch element, and the 6th PMOS pipe 206 is as reverse isolation element.The drain electrode of the 5th PMOS pipe 205 is connected with the drain electrode of the 6th PMOS pipe 206, the source electrode of the 5th PMOS pipe 205 connects first input end 100, the source electrode of the 6th PMOS pipe 206 connects the grid of the 3rd PMOS pipe the 203 and the 4th PMOS pipe 204, and the 5th PMOS pipe 205 is connected the first switch control module 107 with the grid of the 6th PMOS pipe 206.
In the present embodiment, the 4th switch module 14 comprises that the 7th PMOS pipe the 207, the 8th PMOS pipe the 208 and the one NMOS pipe 209, the seven PMOS pipe the 207 and the one NMOS pipes 209 are as switch element, and the 8th PMOS pipe 208 is as reverse isolation element.The drain electrode of the 7th PMOS pipe 207 is connected with the drain electrode of the 8th PMOS pipe 208, the source electrode of the 7th PMOS pipe 207 connects the drain electrode of a NMOS pipe 209, the substrate ground connection of the one NMOS pipe 209, the source electrode of the source electrode of the 8th PMOS pipe 208 and a NMOS pipe 209 is connected the grid of the 3rd PMOS pipe the 203 and the 4th PMOS pipe 204, the 7th PMOS pipe 207 is connected first input end 100 with the grid of the 8th PMOS pipe 208, the grid of the one NMOS pipe 209 connects the first switch control module 107, second switch control module 110 inputs to wake-up signal rtc_wkup the drain electrode of the one NMOS pipe 209.
In the present embodiment, the first switch control module 107 comprises the first resistance 211, the second resistance 212 and the 2nd NMOS pipe 210.One end of the first resistance 211 connects first input end 100, the other end ground connection of the first resistance 211, one end of the second resistance 212 connects the second input 118, the other end of the second resistance 212 connects the drain electrode of the 2nd NMOS pipe 210, the source ground of the 2nd NMOS pipe 210, the grid that the grid of the 2nd NMOS pipe 210 connects first input end 100, the one PMOS pipe the 201, the 2nd PMOS pipe the 202, the 5th PMOS pipe the 203, the 6th PMOS pipe the 206 and the one NMOS pipes 209 is connected between the other end of the second resistance 212 and the drain electrode of the 2nd NMOS pipe 210.
In the present embodiment, being described in detail as follows Fig. 2:
When the outer power voltage V_USB of first input end 100 inputs is V0, when the internal power source voltage VCC_BAT of the second input 118 inputs is V1, the 2nd NMOS manages 210 conductings, the drain voltage VS_USB of the 2nd NMOS pipe 210 is low level, therefore, the one PMOS pipe the 201 and the 2nd PMOS manages 202 conductings, and outer power voltage V_USB is powered by output 106 outputs after voltage transformation module 105 is converted to normal working voltage.Now, the 7th PMOS pipe the 207, the 8th PMOS pipe the 208 and the one NMOS pipe 209 cut-offs, to prevent that external power source filling electricity is to wake-up signal rtc_wkup.And the 5th PMOS pipe the 205 and the 6th PMOS manages 206 conductings, VS_BAT is high level, the 3rd PMOS pipe the 203 and the 4th PMOS pipe 204 cut-offs, and internal electric source can not be powered.For preventing that external power source from oppositely filling with electricity to internal electric source, the voltage of VS_BAT need be higher than the voltage of VCC_BAT.
When the outer power voltage V_USB of first input end 100 inputs is 0V, when the internal power source voltage VCC_BAT of the second input 118 inputs is V1, the 2nd NMOS pipe 210 cut-offs, VS_USB is high level, therefore, PMOS pipe the 201 and the 2nd PMOS pipe 202 cut-offs, external power source can not be powered.And the 5th PMOS pipe the 205 and the 6th PMOS pipe 206 cut-offs, the 7th PMOS pipe the 207, the 8th PMOS pipe the 208 and the one NMOS manages 209 conductings.For preventing that internal electric source from oppositely filling with electricity to external power source, the voltage of VS_USB is required to be VCC_BAT.Second switch control module 110 produces wake-up signal rtc_wkup under the effect of internal electric source and wake-up signal rtc_wkup0.Wake-up signal rtc_wkup is transferred to the grid of the 3rd PMOS pipe the 203 and the 4th PMOS pipe 204 through the 7th PMOS pipe the 207 and the 8th PMOS pipe the 208 or the one NMOS pipe 209.When wake-up signal rtc_wkup is 0V, the grid voltage VS_BAT of the 3rd PMOS pipe the 203 and the 4th PMOS pipe 204 is 0V, and the 3rd PMOS pipe the 203 and the 4th PMOS manages 204 conductings, and internal power source voltage VCC_BAT transfers to output 106 and powers.When wake-up signal rtc_wkup is VCC_BAT, the grid voltage VS_BAT of the 3rd PMOS pipe the 203 and the 4th PMOS pipe 204 is VCC_BAT, the 3rd PMOS pipe the 203 and the 4th PMOS pipe 204 cut-offs, and power control system enters powered down sleep state.For preventing that the voltage VCC_BAT of wake-up signal rtc_wkup from oppositely filling with electricity to external power source, added reverse isolation element to turn-off control on its path (i.e. the 4th switch module 14).
The present invention also provides the implementation method of the power control system of the first embodiment.Wherein, power control system comprises first input end, the second input, output, the first switch module, second switch module, the 3rd switch module and the 4th switch module, the first switch module is connected between first input end and output, second switch module is connected between the second input and output, the 3rd switch module is connected between first input end and second switch module, and the 4th switch module is connected 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 there is outer power voltage on first input end, on the second input, there is internal power source voltage, control the first switch module and the 3rd switch module conducting, and control the 4th switch module and end, so that outer power voltage exports output to through the first switch module, and control the cut-off of second switch module through the 3rd switch module.
On first input end, there is not outer power voltage, while there is internal power source voltage on the second input, control the first switch module and the cut-off of the 3rd switch module, and control the 4th switch module conducting, make wake-up signal export second switch module to through the 4th switch module, to control second switch module conducting or cut-off by wake-up signal.When wake-up signal is 0V, the conducting of second switch module, internal electric source exports output to through second switch module and powers; When wake-up signal is not 0V, power control system enters powered down sleep state.
In sum, power control system of the present invention is controlled the break-make of the first switch module, the 3rd switch module and the 4th switch module by the first switch control module, second switch control module is controlled the break-make of second switch module according to the break-make of wake-up signal and the 4th switch module, thereby controls the supply power mode of power control system.By the way, can realize and between internal electric source and external power source, carry out seamless switching, avoid filling with mutually between external power source and internal electric source electric, and when in-line power, support power-off awakening mode.
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a power control system, it is characterized in that, described power control system comprises first input end, the second input, output, the first switch module, second switch module, the 3rd switch module, the 4th switch module, the first switch control module and second switch control module, wherein said first input end is used for connecting external power source, described the second input is used for connecting internal electric source, described the first switch module is connected between described first input end and described output, described second switch module is connected between described the second input and described output, described the 3rd switch module is connected between described first input end and described second switch module, described the 4th switch module is connected between described second switch control module and described second switch module, described the first switch control module connects described first input end, described the second input, described the first switch module, described the 3rd switch module and described the 4th switch module, described second switch control module connects described the second input, and receive a wake-up signal, on described first input end, there is outer power voltage, while there is internal power source voltage on described the second input, described the first switch control module is controlled described the first switch module and described the 3rd switch module conducting, and control described the 4th switch module and end, so that described outer power voltage exports described output to through described the first switch module, and control described second switch module cut-off through described the 3rd switch module, on described first input end, there is not outer power voltage, while there is internal power source voltage on described the second input, described the first switch control module is controlled described the first switch module and described the 3rd switch module cut-off, and control described the 4th switch module conducting, described second switch control module exports described wake-up signal to described second switch module through described the 4th switch module, to control the conducting of described second switch module or cut-off by described wake-up signal.
2. power control system according to claim 1, it is characterized in that, described the first switch module, described second switch module, described the 3rd switch module and described the 4th switch module comprise respectively at least one switch element and at least one reverse isolation element, and described reverse isolation element is used for preventing that electric current is through described switch element reverse circulated.
3. power control system according to claim 1, it is characterized in that, described power control system further comprises voltage transformation module, described voltage transformation module is connected between described the first switch module and described output, with the outer power voltage to through described the first switch module output, carries out voltage transitions.
4. power control system according to claim 1, it is characterized in that, described the first switch module comprises a PMOS pipe and the 2nd PMOS pipe, the drain electrode of a described PMOS pipe is connected with the drain electrode of described the 2nd PMOS pipe, the source electrode of a described PMOS pipe connects described first input end, the source electrode of described the 2nd PMOS pipe connects described output, and a described PMOS pipe is connected described the first switch control module with the grid of described the 2nd PMOS pipe.
5. power control system according to claim 4, it is characterized in that, described second switch module comprises the 3rd PMOS pipe and the 4th PMOS pipe, the drain electrode of described the 3rd PMOS pipe is connected with the drain electrode of described the 4th PMOS pipe, the source electrode of described the 3rd PMOS pipe connects described the second input, the source electrode of described the 4th PMOS pipe connects described output, and described the 3rd PMOS pipe is connected described the 3rd switch module and the 4th switch module with the grid of described the 4th PMOS pipe.
6. power control system according to claim 5, it is characterized in that, described the 3rd switch module comprises the 5th PMOS pipe and the 6th PMOS pipe, the drain electrode of described the 5th PMOS pipe is connected with the drain electrode of described the 6th PMOS pipe, the source electrode of described the 5th PMOS pipe connects described first input end, the source electrode of described the 6th PMOS pipe connects the grid of described the 3rd PMOS pipe and described the 4th PMOS pipe, and described the 5th PMOS pipe is connected described the first switch control module with the grid of described the 6th PMOS pipe.
7. power control system according to claim 6, it is characterized in that, described the 4th switch module comprises the 7th PMOS pipe, the 8th PMOS pipe and NMOS pipe, the drain electrode of described the 7th PMOS pipe is connected with the drain electrode of described the 8th PMOS pipe, the source electrode of described the 7th PMOS pipe connects the drain electrode of a described NMOS pipe, the source electrode of the source electrode of described the 8th PMOS pipe and a described NMOS pipe is connected the grid of described the 3rd PMOS pipe and described the 4th PMOS pipe, described the 7th PMOS pipe is connected described first input end with the grid of the 8th PMOS pipe, the grid of a described NMOS pipe connects described the first switch control module, described second switch control module inputs to described wake-up signal the drain electrode of a described NMOS pipe.
8. power control system according to claim 7, it is characterized in that, described the first switch control module comprises the first resistance, the second resistance and the 2nd NMOS pipe, one end of described the first resistance connects described first input end, the other end ground connection of described the first resistance, one end of described the second resistance connects described the second input, the other end of described the second resistance connects the drain electrode of described the 2nd NMOS pipe, the source ground of described the 2nd NMOS pipe, the grid of described the 2nd NMOS pipe connects described first input end, a described PMOS pipe, described the 2nd PMOS pipe, described the 5th PMOS pipe, the grid of described the 6th PMOS pipe and a described NMOS pipe is connected between the other end of described the second resistance and the drain electrode of described the 2nd NMOS pipe.
9. according to the power control system described in claim 1-8 any one, it is characterized in that, described internal electric source is battery supply.
10. the implementation method of a power control system, it is characterized in that, described power control system comprises first input end, the second input, output, the first switch module, second switch module, the 3rd switch module and the 4th switch module, described the first switch module is connected between described first input end and described output, described second switch module is connected between described the second input and described output, described the 3rd switch module is connected between described first input end and described second switch module, described the 4th switch module is connected between wake-up signal and described second switch module, said method comprising the steps of:
Detect the state of described first input end and described the second input;
If there is outer power voltage on described first input end, on described the second input, there is internal power source voltage, control described the first switch module and described the 3rd switch module conducting, and control described the 4th switch module and end, so that described outer power voltage exports output to through described the first switch module, and control the cut-off of second switch module through described the 3rd switch module;
On described first input end, there is not outer power voltage, while there is internal power source voltage on described the second input, control described the first switch module and described the 3rd switch module cut-off, and control described the 4th switch module conducting, make described wake-up signal export described second switch module to through described the 4th switch module, to control the conducting of described second switch module or cut-off by described wake-up signal.
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| CN108888257A (en) * | 2018-04-28 | 2018-11-27 | 无锡商业职业技术学院 | A kind of wearable health detection equipment of multi-parameter based on shared electrode |
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| CN202260609U (en) * | 2011-08-26 | 2012-05-30 | 维用国际股份有限公司 | Power supply switching device |
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| CN107729785A (en) * | 2017-10-24 | 2018-02-23 | 深圳成谷科技有限公司 | Highway passing card |
| CN107729785B (en) * | 2017-10-24 | 2021-02-02 | 深圳成谷科技有限公司 | Highway passing card |
| CN108888257A (en) * | 2018-04-28 | 2018-11-27 | 无锡商业职业技术学院 | A kind of wearable health detection equipment of multi-parameter based on shared electrode |
| 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 |
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