CN205283163U - Mobile device lithium battery supply manages circuit - Google Patents
Mobile device lithium battery supply manages circuit Download PDFInfo
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- CN205283163U CN205283163U CN201520891436.4U CN201520891436U CN205283163U CN 205283163 U CN205283163 U CN 205283163U CN 201520891436 U CN201520891436 U CN 201520891436U CN 205283163 U CN205283163 U CN 205283163U
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Abstract
The utility model provides a mobile device lithium battery supply manages circuit, include: USB charging circuit, its TVS union coupling is between USB charging source's positive pole and common port, the fourth pin and the anodal of USB charging source of first chip are connected, and the second pin and the common port of first chip are connected, and lithium battery supply's positive pole is connected to the third pin of first chip, and the 5th pin and the one end of first resistance of first chip are connected, and the other end and the common port of first resistance are connected, and lithium battery supply's negative pole also is connected with the common port, battery supply circuit, its third pin with USB charging circuit's first chip is connected, the soft switch circuit of power button, it is connected with battery supply circuit, and the MCU who is connected with the soft switch circuit of power button. The utility model discloses can provide simple, low -cost, a complete reliable lithium cell USB for the small -size mobile device of taking MCU charges, supplies power and the general circuit of the soft switching on and shutting down of a key.
Description
Technical field
The utility model relates to a kind of circuit, relates more specifically to a kind of mobile equipment lithium battery power management circuits.
Background technology
Adopt the mobile equipment of lithium battery power supply, it is necessary to charging and power supply are managed, thus prevent from battery overshoot or cross putting. Prior art generally adopts complicated special chip to complete the management to power supply, due to the circuit complex structure on its chip, causes cost higher. In addition, existing electric power management circuit often can not realize a key to the control of USB charging or power supply, and its software programming often more complicated, chip runs stable not, cause the loss of power supply bigger, during the standby pattern of such as low dropout voltage regulator (LDO) and MCU, its battery efficiency is very low, and standby time is not long.
Practical novel content
The purpose of this utility model is to provide a kind of mobile equipment lithium battery power management circuits, thus solves electric power management circuit cost height and inefficient problem in prior art.
The mobile equipment lithium battery power management circuits that the utility model provides, its battery power management circuit for providing for the small type mobile devices of lithium battery power supply, this circuit comprises: USB charging circuit, USB charging circuit comprises TVS pipe, the first chip, the first resistance and lithium cell, wherein, TVS pipe is connected to USB and charges between the positive pole of power supply and public end; 4th pin of the first chip is connected with the positive pole of USB charging power supply and one end of TVS pipe, 2nd pin of the first chip is connected with the other end of public end and TVS pipe, 3rd pin of the first chip connects the positive pole of lithium cell power supply, 5th pin of the first chip is connected with one end of the first resistance, the other end of the first resistance is connected with the other end of public end and TVS pipe, and the negative pole of lithium cell power supply is also connected with the other end of public end and TVS pipe.
Battery feed circuit comprises the 2nd chip, inductance, the 2nd resistance and the 3rd resistance, wherein, 4th pin of the 2nd chip is connected with the positive pole of lithium cell power supply, 3rd pin of the 2nd chip is connected with one end of inductance, the other end of inductance is connected with one end of the 2nd resistance, the other end of the 2nd resistance is connected with the 5th pin of the 2nd chip, the other end of the 2nd resistance is connected with one end of the 3rd resistance simultaneously, the other end of the 3rd resistance is connected with public end, and the 2nd pin of the 2nd chip is connected with public terminal GND.
2nd chip is bl8021 type, and the 2nd resistance is 240 kilo-ohms, and the 3rd resistance is 180 kilo-ohms.
Power supply button soft switch circuit comprises dividing potential drop circuit, battery voltage detection circuit, power switch key, 6th resistance, 24 or gate logic unit, 34 or gate logic unit and the 44 or gate logic unit, wherein, one end of power switch key is connected with the positive pole of lithium cell power supply, the other end of power switch key is connected with one end of the 6th resistance, the other end of the 6th resistance is connected with public end, two or four or gate logic unit the 4th and the 5th input terminus wire formed tie point, this tie point is connected with the wire of power switch key and the 6th resistance, two or four or the 6th output terminal of gate logic unit be connected with the wire of the three or four or gate logic unit the 9th and the tenth input terminus and form tie point, this tie point is connected with the 13 input terminus of the four or four or gate logic unit, three or four or the GPIO of the 8th output terminal and MCU of gate logic unit input pin and be connected, four or four or the 12 input terminus of gate logic unit be connected with dividing potential drop circuit, the four or four or the 11 output terminal of gate logic unit be connected with the EN pin of the 2nd chip.
Dividing potential drop circuit comprises the 4th resistance, 5th resistance, 7th resistance and the one four or gate logic unit, wherein, one end of 4th resistance is connected with the positive pole of USB charging power supply, the other end of the 4th resistance is connected with one end of the 5th resistance, the other end of the 5th resistance is connected with public end, one end of 7th resistance is connected with public end, the other end of the 7th resistance is connected with the 2nd input terminus of the or four or gate logic unit, one or four or the first input terminus of gate logic unit be connected with the wire of the 4th resistance and the 5th resistance, one or four or the 3rd output terminal of gate logic unit be connected with the 12 input terminus of the four or four or gate logic unit.
Battery voltage detection circuit comprises the 8th resistance and the 9th resistance, wherein, one end of 8th resistance is connected with the positive pole of lithium cell power supply, the other end of the 8th resistance is connected with the ADC pin of MCU, one end of 9th resistance is connected with public end, and the other end of the 9th resistance is connected with the ADC pin of MCU and forms tie point on the wire of the 8th resistance and ADC pin.
4th resistance and the 8th resistance are 47 kilo-ohms, and the 5th resistance, the 6th resistance, the 7th resistance, the 9th resistance are 180 kilo-ohms, first to fourth 4 or gate logic unit be 74HC32 type.
First chip is BL4054 type, and the first resistance is 2 kilo-ohms, and the voltage of lithium cell is 4.2V.
The lithium battery power management circuits of small type mobile devices of the present utility model, it is possible to for band MCU small type mobile devices provides a kind of simple, low cost, complete reliable lithium cell USB charge, power supply and a key Sofe Switch machine universal circuit. Chip and the circuit of general low cost is adopted to coordinate MCU software, design more simple and reliable, software programming is more directly perceived, it is applicable to the mobile equipment of operating voltage 3.3v200mA, coordinated by hardware circuit and MCU program, completing the USB intelligent charge management of lithium cell, battery voltage detection is converted into the charging progress of cell container and battery by software; USB wakes MCU up when charging automatically, is managed by charging progress.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the mobile equipment lithium battery power management circuits according to an embodiment of the present utility model.
Embodiment
Below in conjunction with specific embodiment, the utility model is described further. It will be understood that following examples are only for illustration of the utility model but not for limiting scope of the present utility model.
It is illustrated in figure 1 mobile equipment lithium battery power management circuits of the present utility model, its battery power management circuit for providing for the small type mobile devices of lithium battery power supply, this circuit comprises four parts: USB charging circuit 1, battery feed circuit 2, power supply button soft switch circuit 3 and MCU, this USB charging circuit 1 is connected to battery feed circuit 2, battery feed circuit 2 is connected to power supply button soft switch circuit 3, and power supply button soft switch circuit 3 is connected to MCU.
In this embodiment, USB charging circuit 1 comprises TVS pipe D1, the first chip U1, the first resistance R1 and lithium cell BT, wherein, between the positive pole USBVCC that TVS pipe D1 is connected to USB charging power supply and public terminal GND, thus it is that USB charging circuit provides electrostatic protection (ESD) protection; 4th pin 4 of the first chip U1 is connected with one end of the positive pole USBVCC and TVS pipe D1 of USB charging power supply, 2nd pin 2 of the first chip U1 is connected with the other end of public terminal GND and TVS pipe D1,3rd pin 3 of the first chip U1 connects the positive pole BTVCC of lithium cell BT power supply, 5th pin 5 of the first chip U1 is connected with one end of the first resistance R1, the other end of the first resistance R1 is connected with the other end of public terminal GND and TVS pipe D1, the negative pole of lithium cell BT also the other end with public terminal GND and TVS pipe D1 be connected. First chip U1 selects BL4054 type usually, and the first resistance R1 selects 2 kilo-ohms, and the voltage of lithium cell BT selects 4.2V.
Battery feed circuit 2 comprises the 2nd chip U2, inductance L 1, the 2nd resistance R2 and the 3rd resistance R3, wherein, 4th pin 4 of the 2nd chip U2 is connected with the positive pole BTVCC of lithium cell BT power supply, 3rd pin 3 of the 2nd chip U2 is connected with one end of inductance L 1, the other end of inductance L 1 is connected with one end of the 2nd resistance R2, the other end of the 2nd resistance R2 is connected with the 5th pin 5 of the 2nd chip U2, the other end of the 2nd resistance R2 is connected with one end of the 3rd resistance R3 simultaneously, and the 2nd resistance R2 is also connected with mobile equipment positive source MCUVCC with the wire of inductance L 1; The other end of the 3rd resistance R3 is connected with public terminal GND, and the 2nd pin 2 of the 2nd chip U2 is also connected with public terminal GND. 2nd chip U2 selects bl8021 type usually, and the 2nd resistance R2 selects 240 kilo-ohms, and the 3rd resistance R3 selects 180 kilo-ohms.
Power supply button soft switch circuit 3 comprises dividing potential drop circuit 31, battery voltage detection circuit 32, power switch key K1, 6th resistance R6, 24 or gate logic unit U3B, 34 or gate logic unit U3C and the four or four or gate logic unit U3D, wherein, one end of power switch key K1 is connected with the positive pole BTVCC of lithium cell BT power supply, the other end of power switch key K1 is connected with one end of the 6th resistance R6, the other end of the 6th resistance R6 is connected with public terminal GND, two or four or the wire of the four-input terminal 4 of gate logic unit U3B and the 5th input terminus 5 form tie point, this tie point is connected with the wire of power switch key K1 and the 6th resistance R6, two or four or the 6th output terminal the 6 and the 34 of gate logic unit U3B or the connection of the 9th input terminus 9 of gate logic unit U3C and the wire of the tenth input terminus 10 and form tie point, this tie point is connected with the 13 input terminus 13 of the four or four or gate logic unit U3D, three or four or the GPIO of the 8th output terminal 8 and MCU of gate logic unit U3C input pin and be connected, four or four or the 12 input terminus 12 of gate logic unit U3D be connected with dividing potential drop circuit 31, the four or four or the 11 output terminal 11 of gate logic unit U3D be connected with the EN pin of the 2nd chip U2, dividing potential drop circuit 31 comprises the 4th resistance R4, 5th resistance R5, 7th resistance R7 and the or four or gate logic unit U3A, wherein, one end of 4th resistance R4 is connected with the positive pole USBVCC of USB charging power supply, the other end of the 4th resistance R4 is connected with one end of the 5th resistance R5, the other end of the 5th resistance R5 is connected with public terminal GND, one end of 7th resistance R7 is connected with public terminal GND, the other end of the 7th resistance R7 is connected with the 2nd input terminus 2 of the or four or gate logic unit U3A, one or four or first input terminus 1 of gate logic unit U3A be connected with the wire of the 4th resistance R4 and the 5th resistance R5, one or four or the 3rd output terminal 3 of gate logic unit U3A be connected with the 12 input terminus 12 of the four or four or gate logic unit U3D, battery voltage detection circuit 32 comprises the 8th resistance R8 and the 9th resistance R9, wherein, one end of 8th resistance R8 is connected with the positive pole BTVCC of lithium cell BT power supply, the other end of the 8th resistance R8 is connected with the ADC pin of MCU, one end of 9th resistance R9 is connected with public terminal GND, and the other end of the 9th resistance R9 is connected with the ADC pin of MCU and forms tie point on the wire of the 8th resistance R8 and ADC pin. in this embodiment, the 4th resistance R4 and the 8th resistance R8 selects 47 kilo-ohms, and the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 9th resistance R9 select 180 kilo-ohms, the one or four or gate logic unit U3A-D select 74HC32 type.
MCU is connected with mobile equipment positive source MCUVCC, simultaneously, MCU provides GPIO input terminus, GPIO output terminal and ADC pin, the GPIO input terminus of MCU is connected with the 8th input terminus 8 of the three or four or gate logic unit U3C, the GPIO output terminal of MCU is connected with dividing potential drop circuit 31, and on the one or four or the 2nd input terminus 2 of gate logic unit U3A and the wire of the 7th resistance R7, form tie point, the ADC pin of MCU is connected with battery voltage detection circuit 32, and on the wire of the 8th resistance R8 and the 9th resistance R9, form tie point, MCU coordinates software to complete power switch and power supply management of charging and discharging.
Mobile equipment lithium battery power management circuits of the present utility model, its USB charging circuit by the 5vUSB wire of insertion standard just can starting outfit, to lithium cell charging, when cell voltage is full of can automatic charge closing electric current, maintenance floating current, if desired USB connection can expand USB connection interface. first chip U1 forms the charging circuit of lithium cell, and by R1 resistance adjustment maximum charging current, general control is at 500mA, circuit forms USB voltage detecting circuit by the 4th resistance R4, R5, starts MCU and detects charging voltage, when disconnecting USB wire and complete, automatic DC/DC circuit closes MCU. TVS pipe D1 is USB charging circuit offer ESD (electrostatic protection) protection, when USB power source is connected, by R4, the dividing potential drop circuit that R5 is formed, for chip U3A unit provides " height " logic level, 4 or door U3A unit export as high, or door U3D unit exports as high, open the output+3.3V of U2DC/DC circuit, for MCU powers, MCU Programmable detection key-press input is low, judge start wish thus for USB charge, the voltage of battery is detected in real time by battery detection circuit, judge whether charging is full of, by whether instruction circuit (not shown) prompting user's charging completes, the GPIO pin now connecting the MCU of U3A unit is high resistance input pattern, is lower level under the effect of drop-down 7th resistance R7. when USB power source is cancelled, owing to USB power source detection exports as low, the power supply that MCU exports simultaneously keeps pin to be low, and logical block U3A exports as low, and logical block U3D exports as low, and the EN pin of U2 is low, closes MCU and powers, reaches automatic shutdown object.
The DC/DC circuit that the lithium cell of battery feed circuit is consisted of the 2nd chip U2 (bl8021) and inductance L 1 is that MCU even load circuit is powered. 2nd chip U2 and peripheral inductance L 1, the 2nd resistance R2, the 3rd resistance R3 form DC/DC battery feed circuit, under soft boot-strap circuit controls, for MCU circuit is powered.
Power supply button soft switch circuit provides " key " power on/off function, maintains the time of a software definition by & off switch, and circuit is opened DC/DC circuit and powered by equipment, unclamps button, and equipment maintains power supply state; Again by " power switch key " software control closing device power supply. Soft power switch logic is formed by the output GPIO of switching on and shutting down button Key, chip U3BCD unit and MCU; The EN pin of power switch logic control DC/DC chip, the electric power starting of control MCU and closedown. The ADC sampling of the 8th resistance R8, R9 and MCU forms battery voltage detection circuit, by cell container software algorithm, converts the landing of cell voltage to cell container; Simultaneously after detecting that cell voltage is lower than the protection voltage of battery, closing MCU powered battery, the battery preventing battery over-discharge and cause damages and capacity decline, reaches the object of protection battery.
The utility model can provide complete battery charging and discharging and soft power switch control Integral design circuit. The utility model is for employing 4.2v lithium battery power supply, and the MCU of operating voltage 3.3V and the electric power management circuit of attached circuit, maximum functional electric current is not more than 200mA.
The utility model provides soft power switch design, and the power supply electric current of MCU and attached circuit is not by keyswitch, and button provides start function and shutdown function, also can coordinate the function of the self-defined power supply button of software simulating. After button is pressed, logical block U3B, U3C, U3D export as high level, DC/DC circuit working, exporting the MCU operating voltage of+3.3V, after MCU starts, MCU inputs pin detection button by GPIO, provide MCU to have worked instruction (not shown), it is high that power supply is kept the GPIO output pin of pin to be set to output by the high resistance state inputted by MCU, logical block U3A is exported as high, keeps DC/DC circuit to continue work; Owing to the power supply of MCU keeps pin, MCU is powered after button discharges lasting. When user shuts down, by power supply button, MCU detects key-press status, and will shut down (not shown) by prompting user MCU, after detection user discharges button, power supply is kept pin to be set to high resistance state by MCU, under the effect of drop-down 7th resistance R7, logical block U3A exports as low, closes battery feed circuit 2, thus close+3.3v the power supply of MCU and attached circuit, equipment stopping work.
This circuit is only powered for logical device chip U3 when stopping work, only has 10 microamperes during equipment stopping work, and working current is less than the 1/10 of self-discharge of battery. Make equipment can be in standby state for a long time, provide higher battery efficiency than the standby pattern of LDO (low dropout voltage regulator)+MCU, longer standby time, be more suitable for the power supply management of small hand held devices.
Above-described, it is only better embodiment of the present utility model, it does not mean to limit scope of the present utility model, above-described embodiment of the present utility model can also make a variety of changes. Namely every claim book according to the utility model application and description are done simple, equivalence change and modify, and all fall into the claims of the utility model patent. The not detailed description of the utility model be routine techniques content.
Claims (8)
1. a mobile equipment lithium battery power management circuits, it provides battery power management circuit for the small type mobile devices for lithium battery power supply, it is characterised in that, described circuit comprises:
USB charging circuit, described USB charging circuit comprises TVS pipe, the first chip, the first resistance and lithium cell, wherein, between the positive pole that described TVS pipe is connected to USB charging power supply and public end; Described first chip is BL4054 type, and the 4th pin of this first chip is connected with the positive pole of USB charging power supply and one end of described TVS pipe, 2nd pin of the first chip is connected with the other end of public end and described TVS pipe, 3rd pin of the first chip connects the positive pole of lithium cell power supply, 5th pin of the first chip is connected with one end of the first resistance, the other end of the first resistance is connected with the other end of public end and described TVS pipe, and the negative pole of lithium cell power supply is also connected with the other end of public end and described TVS pipe;
Battery feed circuit, this battery feed circuit is connected with the 3rd pin of the first chip of USB charging circuit;
Power supply button soft switch circuit, power supply button soft switch circuit is connected with battery feed circuit; And
MCU, described MCU are connected with power supply button soft switch circuit.
2. mobile equipment lithium battery power management circuits according to claim 1, it is characterized in that, described battery feed circuit comprises the 2nd chip, inductance, 2nd resistance and the 3rd resistance, wherein, described 2nd chip is bl8021 type, and the 2nd the 4th pin of chip be connected with the positive pole of lithium cell power supply, 3rd pin of the 2nd chip is connected with one end of inductance, the other end of inductance is connected with one end of the 2nd resistance, the other end of the 2nd resistance is connected with the 5th pin of the 2nd chip, the other end of the 2nd resistance is connected with one end of the 3rd resistance simultaneously, the other end of the 3rd resistance is connected with public end, 2nd pin of the 2nd chip is connected with public terminal GND.
3. mobile equipment lithium battery power management circuits according to claim 2, it is characterised in that, the 2nd resistance is 240 kilo-ohms, and the 3rd resistance is 180 kilo-ohms.
4. mobile equipment lithium battery power management circuits according to claim 1, it is characterized in that, described power supply button soft switch circuit comprises dividing potential drop circuit, battery voltage detection circuit, power switch key, 6th resistance, 24 or gate logic unit, 34 or gate logic unit and the 44 or gate logic unit, wherein, one end of power switch key is connected with the positive pole of lithium cell power supply, the other end of power switch key is connected with one end of the 6th resistance, the other end of the 6th resistance is connected with public end, two or four or gate logic unit the 4th and the 5th input terminus wire formed tie point, this tie point is connected with the wire of power switch key and the 6th resistance, two or four or the 6th output terminal of gate logic unit be connected with the wire of the three or four or gate logic unit the 9th and the tenth input terminus and form tie point, this tie point is connected with the 13 input terminus of the four or four or gate logic unit, three or four or the GPIO of the 8th output terminal and MCU of gate logic unit input pin and be connected, four or four or the 12 input terminus of gate logic unit be connected with dividing potential drop circuit, the four or four or the 11 output terminal of gate logic unit be connected with the EN pin of the 2nd chip.
5. mobile equipment lithium battery power management circuits according to claim 4, it is characterized in that, described dividing potential drop circuit comprises the 4th resistance, 5th resistance, 7th resistance and the one four or gate logic unit, wherein, one end of 4th resistance is connected with the positive pole of USB charging power supply, the other end of the 4th resistance is connected with one end of the 5th resistance, the other end of the 5th resistance is connected with public end, one end of 7th resistance is connected with public end, the other end of the 7th resistance is connected with the 2nd input terminus of the or four or gate logic unit, one or four or the first input terminus of gate logic unit be connected with the wire of the 4th resistance and the 5th resistance, one or four or the 3rd output terminal of gate logic unit be connected with the 12 input terminus of the four or four or gate logic unit.
6. mobile equipment lithium battery power management circuits according to claim 5, it is characterized in that, described battery voltage detection circuit comprises the 8th resistance and the 9th resistance, wherein, one end of 8th resistance is connected with the positive pole of lithium cell power supply, the other end of the 8th resistance is connected with the ADC pin of MCU, and one end of the 9th resistance is connected with public end, and the other end of the 9th resistance is connected with the ADC pin of MCU and forms tie point on the wire of the 8th resistance and ADC pin.
7. mobile equipment lithium battery power management circuits according to claim 6, it is characterized in that, 4th resistance and the 8th resistance are 47 kilo-ohms, and the 5th resistance, the 6th resistance, the 7th resistance, the 9th resistance are 180 kilo-ohms, first to fourth 4 or gate logic unit be 74HC32 type.
8. mobile equipment lithium battery power management circuits according to claim 1, it is characterised in that, the first resistance is 2 kilo-ohms, and the voltage of lithium cell is 4.2V.
Priority Applications (1)
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| CN201520891436.4U CN205283163U (en) | 2015-11-10 | 2015-11-10 | Mobile device lithium battery supply manages circuit |
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| CN201520891436.4U CN205283163U (en) | 2015-11-10 | 2015-11-10 | Mobile device lithium battery supply manages circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106532154A (en) * | 2016-12-20 | 2017-03-22 | 深圳市优迈德科技有限公司 | Novel power management circuit of lithium battery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106532154A (en) * | 2016-12-20 | 2017-03-22 | 深圳市优迈德科技有限公司 | Novel power management circuit of lithium battery |
| CN106532154B (en) * | 2016-12-20 | 2023-03-21 | 深圳市优迈德科技有限公司 | Novel lithium battery power supply management circuit |
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