CN208062858U - A kind of electric power management circuit for hand-held equipment - Google Patents
A kind of electric power management circuit for hand-held equipment Download PDFInfo
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- CN208062858U CN208062858U CN201820579353.5U CN201820579353U CN208062858U CN 208062858 U CN208062858 U CN 208062858U CN 201820579353 U CN201820579353 U CN 201820579353U CN 208062858 U CN208062858 U CN 208062858U
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- circuit
- booster circuit
- charging
- foot
- power management
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Abstract
The utility model discloses a kind of electric power management circuit for hand-held equipment, coordinate microcontroller and booster circuit, reduction voltage circuit, charging circuit by several discrete components, realize the power management function of handheld device.The reduction voltage circuit, booster circuit, charging circuit have the enabled control foot of a high level respectively；The power input of the reduction voltage circuit is connected with charge port anode, reduction voltage circuit output end is connected with the booster circuit output end and the charging circuit input terminal, the charging circuit output end is connected with lithium battery anode, the booster circuit input terminal is connected with lithium battery anode, and the micro-control unit is connected with the enabled control foot of booster circuit and charging circuit respectively by general input/output port；Lithium battery can be converted to system working power, system working power anode several alminium electrolytic condensers in parallel between ground by the booster circuit.The circuit can be integrated in the handheld device hardware system of any charged pool, be taken up less resources, securely and reliably.
Description
Technical field
The utility model is related to electronic circuit technology fields, more particularly to a kind of electric power management circuit for hand-held equipment.
Background technology
It is generally individually completed by lithium battery using lithium battery as the power supply of the handheld device of power supply, external power supply is only capable of to battery
It charges, can not directly handheld device power, the utilization rate of electric energy is low.And lithium battery energy density is compared with conventional lead acid electricity
Pond is much bigger, it is easy on fire Deng dangerous situations occur.Reliable and stable power management system is usually required for this kind of equipment
System reduces quiescent current under equipment off-mode and ensures the safe operation of system to improve equipment cruising ability.
Invention content
In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a kind of electric power management circuit for hand-held equipment,
By several triodes, diode, resistance, capacitance, coordinate microcontroller and booster circuit, reduction voltage circuit, charging circuit, realizes
The power management functions such as booting, shutdown, the charge and discharge of handheld device.
Technical solution used by the utility model is：A kind of electric power management circuit for hand-held equipment, including reduction voltage circuit, liter
Volt circuit, micro-control unit, charging circuit, the reduction voltage circuit, booster circuit, charging circuit have a high level respectively to be made
Foot can be controlled；The power input of the reduction voltage circuit is connected with charge port anode, reduction voltage circuit output end and boosting electricity
Road output end and the charging circuit input terminal are connected, and the charging circuit output end is connected with lithium battery anode, the boosting
Circuit input end is connected with lithium battery anode, the micro-control unit by general input/output port respectively with booster circuit and fill
The enabled control foot of circuit is connected；Battery power is converted to system working power, system work electricity by the booster circuit
Source anode several alminium electrolytic condensers in parallel between ground.The enabled control foot of the charging circuit is connected with triode, three poles
Pipe is NPN triode, and concrete model is preferably MMBTA05LT1 triodes.
Compared with prior art, the utility model has the beneficial effects that：The handheld device that any charged pool can be integrated in is hard
It in part system, takes up less resources, securely and reliably；It only operates a non-self-lock-ing button and the intelligence booting of equipment, intelligence can be realized
Shutdown；When equipment charge mouth does not access charger, equipment charge circuit does not work, and battery only can externally be put by booster circuit
Electricity；After equipment charge mouth accesses charger and is switched on, voltage booster circuit for battery is automatically stopped work, and equipment runs electric energy completely by filling
Electric appliance provides, and extends battery life, while equipment judges battery status, opens charging circuit according to battery status and is filled to battery
Electricity is automatically stopped charging after charging complete；It, will be automatic if cell voltage is too low when equipment charge mouth does not access charger and is switched on
Stopping power-on operation and protects battery, the equipment for being in open state and charge port access charger removes or is inserted into charger,
Equipment will not power down by normal operation.
Description of the drawings
Fig. 1 is a kind of structure diagram of electric power management circuit for hand-held equipment of the utility model；
Fig. 2 is a kind of schematic diagram of electric power management circuit for hand-held equipment embodiment of the utility model.
Specific implementation mode
The technical solution in the utility model is clearly and completely described below in conjunction with attached drawing.
Referring to Fig. 1, a kind of electric power management circuit for hand-held equipment, including reduction voltage circuit, booster circuit, micro-control unit
（MCU）, charging circuit, reduction voltage circuit, booster circuit, charging circuit have the enabled control foot of a high level respectively；Decompression electricity
The power input on road is connected with charge port anode, reduction voltage circuit output end and booster circuit output end and charging circuit input terminal
It is connected, charging circuit output end is connected with lithium battery anode, and booster circuit input terminal is connected with lithium battery anode, micro-control unit
It is connected respectively with the enabled control foot of booster circuit and charging circuit by general input/output port.
Whole power supply architecture is：External power supply is depressurized to system operating voltage by reduction voltage circuit, and lithium battery can pass through liter
Volt circuit is converted to system working power, and it is that lithium battery charges that charging circuit takes electricity from system operating voltage source.Reduction voltage circuit, liter
Volt circuit, charging circuit all have an enabled control foot, and are all that high level enables type, i.e. the foot level is identified as high level
When circuit could work normally, otherwise the partial circuit is considered as open circuit.Handheld device is to realize to use flexible and convenient, is normally made
It is run with internal lithium battery power supply is only relied in the process.When equipment not enough power supply, can charge to it, equipment charge is same
When there is still a need for the abilities for having normal work.In addition to this, arbitrary plug charging plug shall not influence in charging process
The normal use of equipment.
In conjunction with Fig. 2, in the case where not connecing charger, button S1 is pinned, the enabled foot of booster circuit can be with lithium battery
Anode is connected by diode D1, and booster circuit identifies that the foot voltage is high level, and booster circuit is started to work, by cell voltage
System operating voltage is boosted to, MCU, which is powered on, to bring into operation.A delay is carried out after MCU operations first, to realize long-press booting
Function.For example, the junction voltage of MCU cycle detection button S1 and diode D1 after the power is turned on, once detect battery voltage value
Cycle simultaneously trigger 2 seconds are just jumped out, then detect voltage at this again, if button is released in the process, booster circuit
It is stopped at once, MCU power down stops.If button still keeps down state, MCU that can again be collected at this after 2 seconds
Cell voltage, booster circuit is enabled foot at once and is drawn high by universal input/output pin by MCU, even if button is released, boosting electricity
Road still remains operational state, and system completes boot action.When MCU is in normal course of operation, S1 is depressed again, and MCU is again
Cell voltage can be obtained in the position, then begin to delay 2 seconds, and collection voltages again, once recognition button S1 is long pressed
Up to 2 seconds, booster circuit was enabled foot and dragged down by MCU, and booster circuit is stopped, MCU power down, realized system closedown action.It is opening
During machine, if the battery voltage value of MCU detections is less than the minimum discharge voltage that battery allows, button actions will be invalid, booting
It terminates.
The incipient stage of electricity operation on MCU, before judging S1 button states, MCU can read cell voltage first, and sentence
Whether the disconnected voltage value is less than the minimum discharge voltage that battery allows, if cell voltage is less than the value, MCU can be by charging circuit
Enabled foot is drawn high, and otherwise not enabling foot to this operates.When charger accesses, it is not necessarily to operation button, system can also be certainly
It moves and charges to lithium battery.MCU constantly obtains cell voltage in charging process, and when battery reaches certain value full of voltage, MCU is drawn
Low charging circuit enables foot.
Once charger accesses, will force to drag down liter by the control circuit of resistance R2, resistance R3, triode Q1 compositions
Volt circuit enables foot, closes booster circuit, and lithium battery no longer externally discharges, and electric energy needed for system operation is directly by external charger
It provides.
By the control circuit of resistance R5, resistance R6, triode Q2 compositions, as long as the enabled foot of booster circuit is high electricity
Flat, i.e., when lithium battery discharges, the enabled foot of charging circuit is in low level always, i.e. lithium battery is not at charged state, can be with
Prevent lithium battery from discharging in charging, circuit forms abnormal circuit.
System working power anode several alminium electrolytic condensers in parallel with being needed between ground in circuit store up for system electricity rail
Can, to prevent the moment removed in charger, booster circuit does not start completely also but system voltage has failed, and leads to system power failure
Shutdown or MCU reset.
The specific embodiment party of electric power management circuit for hand-held equipment in the utility model is described in detail below in conjunction with Fig. 1 Fig. 2
Formula.
When the non-access device of charger and button S1 attonitys, booster circuit enables foot and is pulled down to GND by resistance R4, boosts
Circuit does not work, and lithium battery does not carry out any type of electric discharge externally, and equipment can remain prolonged standby.
When charger access device and button S1 attonitys, due to reduction voltage circuit enabled foot always with charge port input terminal
It is connected, as long as there is external power supply input, reduction voltage circuit begins to work, and system working power is established, and MCU, which is powered on, to bring into operation.
The universal input output pin GPIO2 of MCU enables foot with charging circuit by resistance R6 and is connected, the collection of simulant signal foot of MCU
ADC2 is connected with lithium battery anode.After MCU brings into operation, whether the value for first detecting collection of simulant signal foot ADC2 is less than lithium battery
The minimum discharge voltage of permission draws high universal input output pin GPIO2 if being less than.Since to enable foot same for charging circuit
When by MCU and NPN type triode Q2 controls, when external charger accesses, the base voltage of triode Q1 is equal to charger output
The enabled foot of booster circuit is clamped to 0.3V by voltage while Q1 is connected, which passes through resistance R5 and triode Q2 bases
Extremely it is connected, it is 0.3V to lead to triode Q2 base stages point also, and triode Q2 can not be connected, and charging circuit enables foot only by GPIO2
Control.If cell voltage is less than the minimum discharge voltage allowed, after universal input output pin GPIO2 is drawn high, charging circuit will
It is that battery charges that the power supply that can be exported from reduction voltage circuit, which takes electricity,.Lithium battery voltage value after fully charged can reach a fixed value,
Generally 4.2V.MCU detects that GPIO2 stoppings are dragged down after the voltage value charges to it.
Before charger access device and button S1 are pressed, for MCU other than charging the battery management, program is in one
In cycle.MCU constantly acquires the voltage value on collection of simulant signal foot ADC1, i.e. voltage between button S1 and diode D1.
If button S1 is not pressed, the value of collection of simulant signal foot ADC1 should be 0 or slightly larger than 0（It is limited to MCU sampling precisions and mistake
Difference）.Once button S1 is pressed, collection of simulant signal foot ADC1 will be connected with lithium battery anode, collection of simulant signal foot ADC1
On can collect cell voltage, MCU then carries out the delay of a 2 second time（Time can customize）, read again simulation
The voltage value of signal acquisition foot ADC1, by universal input output pin if the voltage value is more than the minimum discharge voltage that battery allows
GPIO1 is drawn high, and jumps out cycle, is otherwise not responding to push-botton operation, and program continues cycling through.The enabled foot of booster circuit is simultaneously by MCU
It is controlled with triode Q1, although universal input output pin GPIO1 exports a high level by resistance R1, due to triode Q1
Conducting, enabled foot voltage are clamped to 0.3V, and booster circuit can not work.But due to having jumped out above-mentioned cyclic program, MCU can
To execute other functional requirements of equipment, equipment can be got up with normal operation, can be considered and be switched on successfully.
Before the non-access device of charger and button S1 are pressed, booster circuit enable foot pulled down by resistance R4, booster circuit without
Method works, MCU power down.Once button S1 is pressed, lithium battery anode with booster circuit after S1 and diode D1 by enabling foot
It is connected, it is about that cell voltage subtracts 0.3V to make the foot voltage, can still be identified as high level, and booster circuit is started to work.MCU
Operating procedure after the power is turned on is consistent with the above situation.MCU is run in above-mentioned cyclic program after the power is turned on, if cell voltage is less than
The minimum discharge voltage allowed, button actions will not be responded, once button unclamps, booster circuit is out of service, and system is fallen
Electricity.If meeting cell discharge requirements, MCU jumps out cycle post-tensioning high pass input and output foot GPIO1 feet, even if S1 is released, rises
The enabled foot of volt circuit can also keep high level, and to continue to execute other functional requirements of equipment, equipment can be transported normally MCU
Row gets up, and can be considered and is switched on successfully.
In the non-access device of charger and equipment normal course of operation, the enabled foot of booster circuit maintains high level shape
State, booster circuit continue working.The base stage of triode Q2 is connected by resistance R5 with the enabled foot, and triode Q2, which is constantly in, to be led
The enabled foot of charging circuit is clamped to 0.3V or so by logical state, and charging circuit is assorted regardless of the GPIO2 outputs of universal input output pin
Level will not all work, it is ensured that will not charge to it while battery discharge.If button S1 is pressed again
Under, once detect that collection of simulant signal foot ADC1 voltage values are cell voltage, MCU triggers 2 seconds（Length can temporally be made by oneself
Justice）And the voltage value of collection of simulant signal foot ADC1 is read again, if being still cell voltage, MCU is by universal input output pin
GPIO1 becomes low level from high level, and booster circuit is stopped, device looses power shutdown.If button is released in 2 seconds, MCU is not
Detect cell voltage, then shutting down fails, and MCU is judged as that button accidentally touches event, and equipment continues to run with.
In charger access device and equipment normal course of operation, triode Q1 base stages are inputted by resistance R2 and charger
Proper pole is connected to high level, triode Q1 conductings, and booster circuit enables foot and is clamped at 0.3V, do not work, and equipment institute is useful
Electricity is all obtained by reduction voltage circuit from charger.If button S1 is pressed again, once detect that ADC1 voltage values are battery
Voltage, MCU triggers 2 seconds（Length temporally can customize）And the voltage value of ADC1 is read again, if being still cell voltage,
Universal input output pin GPIO1 is become low level by MCU from high level, the case where different from not accessing charger, universal input
After output pin GPIO1 output low levels, equipment not power down, MCU needs to stop all feature operations, closes and removes battery charging valve
Institute other than reason is functional, and to reach shutdown effect, once charger removes, equipment shuts down complete power down.
C1, C2, C3 are alminium electrolytic condenser, and particular capacity size is adjusted according to actual demand, for system working power
Energy storage.In the state that equipment normal operation and charger keep access, charger is removed suddenly, and triode Q1 is moved in charger
The time point removed is that cut-off needs a time t1 by ON transitions.After having crossed time t1, booster circuit, which enables foot, to be become
High level, lithium battery voltage is boosted to system operating voltage and also needs to time t2 by booster circuit, although the total time of t1+t2
It is very short, but in this extremely short time, if the storage capacitor of enough capacity does not undertake as load and MCU power supplies times temporarily
Business, MCU will instant power-down, equipment will shut down or restarts.Total capacitance of storage capacitor is the bigger the better, but also to consider decompression electricity
The output capacitance parameter request on road and the layout cabling mode of circuit board, if reduction voltage circuit is DC-DC types, output capacitance is excessive
The overcurrent protection function of decompression chip, which can be triggered, causes reduction voltage circuit to fail.Therefore, total capacitance of storage capacitor is needed according to specific
Decompression chip and circuit-board laying-out cabling, load consider.
Claims (5)
1. a kind of electric power management circuit for hand-held equipment, including reduction voltage circuit, booster circuit, micro-control unit（MCU）, charging electricity
Road, it is characterised in that：The reduction voltage circuit, booster circuit, charging circuit have the enabled control foot of a high level respectively；It is described
The power input of reduction voltage circuit is connected with charge port anode, reduction voltage circuit output end and the booster circuit output end and described
Charging circuit input terminal is connected, and the charging circuit output end is connected with lithium battery anode, the booster circuit input terminal and lithium
Anode is connected, and the micro-control unit passes through the general input/output port enabled control with booster circuit and charging circuit respectively
Foot processed is connected.
2. a kind of electric power management circuit for hand-held equipment according to claim 1, it is characterised in that：Battery power passes through described
Booster circuit is converted to system working power, system working power anode several alminium electrolytic condensers in parallel between ground.
3. a kind of electric power management circuit for hand-held equipment according to claim 1 or 2, it is characterised in that：The charging circuit
Enabled control foot be connected with triode.
4. a kind of electric power management circuit for hand-held equipment according to claim 3, it is characterised in that：The triode is NPN
Triode.
5. a kind of electric power management circuit for hand-held equipment according to claim 4, it is characterised in that：The triode is
MMBTA05LT1 triodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820579353.5U CN208062858U (en) | 2018-04-23 | 2018-04-23 | A kind of electric power management circuit for hand-held equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820579353.5U CN208062858U (en) | 2018-04-23 | 2018-04-23 | A kind of electric power management circuit for hand-held equipment |
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| Publication Number | Publication Date |
|---|---|
| CN208062858U true CN208062858U (en) | 2018-11-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820579353.5U Active CN208062858U (en) | 2018-04-23 | 2018-04-23 | A kind of electric power management circuit for hand-held equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112072738A (en) * | 2020-09-02 | 2020-12-11 | 浙江启扬智能科技有限公司 | Power management system of handheld device |
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2018
- 2018-04-23 CN CN201820579353.5U patent/CN208062858U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112072738A (en) * | 2020-09-02 | 2020-12-11 | 浙江启扬智能科技有限公司 | Power management system of handheld device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: WUHAN FU'AN TECHNOLOGY Co.,Ltd. Assignor: WUHAN AUTOMO TECHNOLOGY Co.,Ltd. Contract record no.: 2018420000028 Denomination of utility model: A power management circuit for handheld devices Granted publication date: 20181106 License type: Common License Record date: 20210709 |