CN204633465U - A kind of alternating current-direct current for specially becoming acquisition terminal switches and key wakeup control circuit - Google Patents
A kind of alternating current-direct current for specially becoming acquisition terminal switches and key wakeup control circuit Download PDFInfo
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- CN204633465U CN204633465U CN201520405256.0U CN201520405256U CN204633465U CN 204633465 U CN204633465 U CN 204633465U CN 201520405256 U CN201520405256 U CN 201520405256U CN 204633465 U CN204633465 U CN 204633465U
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Abstract
The utility model discloses a kind of alternating current-direct current for specially becoming acquisition terminal to switch and key wakeup control circuit, reset chip D9 connects the base stage of NPN triode V34, and the collector electrode of V34 connects the collector electrode of PNP triode V33; CPU connects the WDI pin of reset chip D9, and the reset pin of D9 connects the base stage of NPN triode V14, and the collector electrode of V14 connects the base stage of V33; The input of button K4 connects VCC and Vbat, and output signal connects the emitter of PNP triode V54, and direct voltage 12V connects the base stage of V54; Voltage signal accesses the base stage of NPN triode V40 through resistance R129, R132, R139, and the collector electrode of V40 connects the grid of PMOS D17, and the drain electrode of D17 connects Vbat.Achieve the automatic switchover between Alternating Current Power Supply and Ni-MH battery direct current supply; By key wakeup direct current supply and follow procedure require battery supply is turned off completely.
Description
Technical field
The utility model relates to the electrical source exchange control circuit in a kind of power information acquisition terminal, is specifically related to a kind of alternating current-direct current for specially becoming acquisition terminal and switches and key wakeup control circuit.
Background technology
Gather in product in power information, the use of battery is very general.Due to as existing defects on the electrical source exchange design on control circuit of prior art, a lot of electrical source exchange control circuit cannot realize the seamless automatic switchover of system power supply.Therefore, in this case, need to adopt many logic powers commutation circuit clearly.
In addition, power information terminal generally has key wakeup function.According to the design of existing control circuit, usually partial circuit is switched to low power consumpting state after powered battery completes necessary function, real cell shut down cannot be realized, cause battery to be in power consumption state for a long time, until exhausted by cell voltage.
Utility model content
Technical problem to be solved in the utility model is, providing a kind of alternating current-direct current for specially becoming acquisition terminal to switch and key wakeup control circuit, realizing the automatic switchover between Alternating Current Power Supply and Ni-MH battery direct current supply; By key wakeup direct current supply and follow procedure require battery supply is turned off completely.
The technical scheme solving the utility model technical problem is as follows.
Alternating current-direct current for specially becoming acquisition terminal switches and a key wakeup control circuit, it is characterized in that it comprises system CPU, reset chip D9 and the button K4 as multiplexing button; 12V direct current signal accesses the voltage comparator input of reset chip D9 after resistance R1 and resistance R2 dividing potential drop, the resistance R41 of the mutual series connection of voltage comparator output warp of reset chip D9 and resistance R111 connects the base stage of NPN triode V34, and the collector electrode of NPN triode V34 connects the collector electrode of PNP triode V33 through resistance R129; The WDI pin of the output feeding-dog signal termination reset chip D9 of system CPU, the reset pin of reset chip D9 connects the base stage of NPN triode V14 through resistance R79, the collector electrode of NPN triode V14 connects the base stage of NPN triode V33 through resistance R110; A signal input part of button K4 is through diode V56 connected system power supply VCC, another signal input part connects anode of nickel-metal hydride battery Vbat through diode V74, the signal output part of button K4 connects the emitter of PNP triode V54, the collector electrode of PNP triode V54 connects the base stage of NPN triode V40 through resistance R139, the base stage of NPN triode V40 to be also connected between the collector electrode of NPN triode V34 and resistance R129 on circuit by resistance R132; The collector electrode of NPN triode V40 connects the grid of PMOS D17, and the drain electrode of PMOS D17 connects anode of nickel-metal hydride battery Vbat; 12V direct current signal connects the base stage of PNP triode V54 through backward diode V53; The signal output part of button K4 is also by an I/O mouth of resistance R137 connected system CPU.
Compared with prior art, the utility model has the following advantages: the utility model circuit can monitor through AC-DC export
Alternating voltage, becomes Ni-MH battery to power system works electrical source exchange lower than during set point.After the power-off event of setting is uploaded main website by system, main system cpu circuit sends reset signal by Ni-MH battery for electroblation, and terminal quits work; Terminal normally starts read system information by key wakeup circuit realiration.The utility model can realize the real-time seamless switching of supplied by AC/DC electricity, and battery key wakeup and battery excise function automatically.The utility model electrical source exchange clear logic, has accomplished seamless switching.The utility model circuit logic is simple, ensure that stability and the reliability of system works.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model.
Embodiment
The utility model is further illustrated below in conjunction with specific embodiments and the drawings.
As shown in Figure 1, embodiment of the present utility model comprises the system CPU and reset chip D9(model SP706TEN-L, producer EXAR that model is SAM9260), also comprise the button K4 as multiplexing button.12V direct current signal accesses the voltage comparator input of reset chip D9 after resistance R1, R2 dividing potential drop, the resistance R41 of the mutual series connection of voltage comparator output warp of reset chip D9 and resistance R111 connects the base stage of NPN triode V34, and the collector electrode of NPN triode V34 accesses the collector electrode of PNP triode V33 through resistance R129.
The WDI pin of the output feeding-dog signal termination reset chip D9 of system CPU, the reset pin of reset chip D9 connects the base stage of NPN triode V14 through resistance R79, the collector electrode of NPN triode V14 connects the base stage of NPN triode V33 through resistance R110.
A signal input part of button K4 is through diode V56 connected system power supply VCC, another signal input part connects anode of nickel-metal hydride battery Vbat through diode V74, the signal output part of button K4 connects the emitter of PNP triode V54, the collector electrode of PNP triode V54 connects the base stage of NPN triode V40 through resistance R139, the base stage of NPN triode V40 to be also connected between the collector electrode of NPN triode V34 and resistance R129 on circuit by resistance R132.The collector electrode of NPN triode V40 connects the grid of PMOS D17, and the drain electrode of PMOS D17 connects anode of nickel-metal hydride battery Vbat.
12V direct current signal connects the base stage of PNP triode V54 through backward diode V53.
The signal output part of button K4 is also by a universaling I/O port of resistance R137 connected system CPU.
On-site terminal realizes key wakeup termination function by key mode, and reset circuit realizes battery by reset signal and exports
Self-locking, ensures that Ni-MH battery is powered to main system work.
(1), terminal Alternating Current Power Supply time, the 12V direct current that main system cpu power is produced by AC-DC is through DC-DC, LDO
The 3.3V produced powers, and 12V direct current charges to Ni-MH battery simultaneously, and multiplexing button realizes normal keypress function, and now Ni-MH battery is not to system power supply, even if click multiplexing button Ni-MH battery also not to system power supply.
(2), terminal Alternating Current Power Supply time, main system cpu circuit sends normal software watchdog reset signal, now can not touch
Send out Ni-MH battery to power.
(3), after AC dump, when electric voltage observation circuit comparator monitoring direct current 12V is down to threshold voltage 7.1V, output voltage
Early warning signal, switches to system power supply simultaneously automatically by Ni-MH battery, if now recover alternating voltage, when direct voltage rises to 8.9V, system is automatically cut off Ni-MH battery and powered, and converts Alternating Current Power Supply to.
(4), after Ni-MH battery powers, multiplexing button realizes normal keypress function; After important information is passed to main website by system,
Main system cpu circuit sends not feeding-dog signal, and reset circuit sends reset signal and transfers to PMOS circuit, by Ni-MH battery excision power supply.
The performing step of logic switch of the present utility model is as follows:
1), terminal series products needs seamlessly switch to powered battery after terminal AC dump.When detect the voltage of 12V power supply lower than comparator input lower in limited time, output low level and VO_PRE are low level, and now reset chip 2 does not reset.As shown in Table 1, BAT_EN sets low and is opened by PMOS D17, is cut by battery supply Vbat, realizes power supply seamless switching.
Table 1: truth table
2), when power-off event is uploaded complete, some terminal cannot cut off battery in time, if civil power recovers very not in time
Easily reserve battery electricity is depleted, have a strong impact on battery.When powered battery, the utility model circuit can realize automatic shut-off function.Reset chip 2 sends reset signal upon system reset, and signal sets low, and turns off NPN triode V14, PNP triode V33 and PNP triode V40, and then turns off PMOS D17 cut-out powered battery, realizes automatic shutdown.
3), when needs key wakeup, push button K4.Electric charge is not had in the filter capacitor C3 of now 12V power supply,
Be equivalent to WAKE in Fig. 1 set high.So PNP triode V54 opens by the loop that can consist of button K4, backward diode V53, resistance R178, electric capacity C3, and then opens PMOS D17, until reset signal sets high, PMOS D17 is maintained, realize key wakeup.
4), detect that 12V supply voltage is in limited time upper higher than input, export high level, conducting NPN triode V34 also turns off NPN triode V40, and then turns off PMOS D17, thus completes the battery-powered seamless switching to mains-supplied.
Claims (1)
1. the alternating current-direct current for specially becoming acquisition terminal switches and a key wakeup control circuit, it is characterized in that it comprises system CPU, reset chip D9 and the button K4 as multiplexing button; 12V direct current signal accesses the voltage comparator input of reset chip D9 after resistance R1 and resistance R2 dividing potential drop, the resistance R41 of the mutual series connection of voltage comparator output warp of reset chip D9 and resistance R111 connects the base stage of NPN triode V34, and the collector electrode of NPN triode V34 connects the collector electrode of PNP triode V33 through resistance R129; The WDI pin of the output feeding-dog signal termination reset chip D9 of system CPU, the reset pin of reset chip D9 connects the base stage of NPN triode V14 through resistance R79, the collector electrode of NPN triode V14 connects the base stage of NPN triode V33 through resistance R110; A signal input part of button K4 is through diode V56 connected system power supply VCC, another signal input part connects anode of nickel-metal hydride battery Vbat through diode V74, the signal output part of button K4 connects the emitter of PNP triode V54, the collector electrode of PNP triode V54 connects the base stage of NPN triode V40 through resistance R139, the base stage of NPN triode V40 to be also connected between the collector electrode of NPN triode V34 and resistance R129 on circuit by resistance R132; The collector electrode of NPN triode V40 connects the grid of PMOS D17, and the drain electrode of PMOS D17 connects anode of nickel-metal hydride battery Vbat; 12V direct current signal connects the base stage of PNP triode V54 through backward diode V53; The signal output part of button K4 is also by an I/O mouth of resistance R137 connected system CPU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520405256.0U CN204633465U (en) | 2015-06-13 | 2015-06-13 | A kind of alternating current-direct current for specially becoming acquisition terminal switches and key wakeup control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520405256.0U CN204633465U (en) | 2015-06-13 | 2015-06-13 | A kind of alternating current-direct current for specially becoming acquisition terminal switches and key wakeup control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204633465U true CN204633465U (en) | 2015-09-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520405256.0U Withdrawn - After Issue CN204633465U (en) | 2015-06-13 | 2015-06-13 | A kind of alternating current-direct current for specially becoming acquisition terminal switches and key wakeup control circuit |
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| Country | Link |
|---|---|
| CN (1) | CN204633465U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868588A (en) * | 2015-06-13 | 2015-08-26 | 烟台东方威思顿电气股份有限公司 | AC/DC switchover and key waking control circuit for acquiring terminal of specific power transformer |
| CN114265464A (en) * | 2022-03-02 | 2022-04-01 | 南京沁恒微电子股份有限公司 | Low-power-consumption power supply system with pre-charging function and control method thereof |
-
2015
- 2015-06-13 CN CN201520405256.0U patent/CN204633465U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104868588A (en) * | 2015-06-13 | 2015-08-26 | 烟台东方威思顿电气股份有限公司 | AC/DC switchover and key waking control circuit for acquiring terminal of specific power transformer |
| CN114265464A (en) * | 2022-03-02 | 2022-04-01 | 南京沁恒微电子股份有限公司 | Low-power-consumption power supply system with pre-charging function and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150909 Effective date of abandoning: 20161012 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |