CN102611420B - A kind of Novel electronic switching circuit of portable power source series products and control flow thereof - Google Patents
A kind of Novel electronic switching circuit of portable power source series products and control flow thereof Download PDFInfo
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Abstract
A kind of Novel electronic switching circuit of the portable power source series products of built-in lithium battery of the present invention, comprise power circuit, booster circuit, electronic switch, circuits for triggering, control circuit, dynamic current sample circuit and dividing potential drop and detect output level circuit, when the confession plug of portable equipment is connected to the power supply base of this Novel electronic switching circuit, this circuit then can be opened automatically, to the equipment needing to power with DC5V, the equipment such as such as MP3, MP4, mobile phone, iPhone are powered.When the programmable single chip computer MCU in this circuit detects that supply current is less than the minimum power supply current value of product setting, the power supply circuits of this circuit are then disconnected by the electronic switch in this circuit, or when the confession plug of portable equipment is separated from the power supply base of this Novel electronic switching circuit, this circuit then can stop powering to output port, automatically switches to the state of Micro Energy Lose simultaneously.Achieve the object of low-loss and energy-saving and more convenient for user.
Description
Technical field
Electronic switching circuit of the present invention, the switching circuit of the electronic power of the portable power source series products particularly containing built-in lithium electricity battery.
Background technology
At present, along with the development of portable type electronic product, portable power source seems more and more important as the needs of attendant equipment in daily life application of portable equipment, such as when user goes out, to have a power failure or under other situation of movement, portable power source can be used to power to the portable equipment that all kinds of needs are powered or charge, especially the equipment of powering with DC5V is needed, the power supply of the equipment such as such as MP3, MP4, mobile phone, iPhone.As shown in Figure 2, the portable power source of usual built-in lithium battery adopts mechanical switch or button-pressing way to cut off the connection of lithium battery and output, thus the object that the power consumption reaching this equipment when equipment does not use is very little.But the method needs manually to operate, troublesome poeration, if close mechanical switch or button when user forgets after being finished this type of portable power source, battery in this portable power source by depleted of energy, can make repeatedly could to power for portable equipment for portable equipment provides the portable power source of electric energy again to charge because of the continuous firing of inner booster circuit.
Summary of the invention
The present invention is that the portable power source that will solve above-mentioned proposition adopts mechanical switch or button-pressing way to cut off the connection of lithium battery and output, and the technical problem produced, a kind of design of a kind of Novel electronic switching circuit of portable power source series products of built-in lithium battery is proposed.When the confession plug of portable equipment is connected to the power supply base of this Novel electronic switching circuit, this circuit then automatically can be opened and power to portable equipment.When programmable single chip computer MCU in the circuit detects that output current is less than the minimum power supply current value of product setting, the power supply circuits of this circuit are then disconnected by the electronic switch in this circuit, or when being separated from the power supply base of this Novel electronic switching circuit by the confession plug of portable equipment, this circuit then can automatically switch to the state of Micro Energy Lose.The portable equipment making user to continue when the energy content of battery has not made repeatedly to use this portable power source to power for demand provides electric energy, achieves the object of low-loss and energy-saving and more convenient for user.
technical scheme provided by the invention is:
A kind of Novel electronic switching circuit of the portable power source series products of built-in lithium battery, comprise: power circuit, booster circuit, electronic switch, circuits for triggering, control circuit, dynamic current sample circuit and dividing potential drop detect output level circuit, described dynamic current sample circuit is connected with the sample port of control circuit, described dividing potential drop detects the feedback test side that output level circuit is connected to booster circuit, and the level signal value of control circuit is connected with the control end of the control end of booster circuit, the control end of electronic switch and circuits for triggering respectively by control output end mouth.
Described power circuit comprises: built-in 4.2V lithium electricity battery, external direct current power supply channel B AT, accumulation of energy inductance L 2, isolating diode D15 and power supply output channel 5V composition, wherein the positive pole of built-in 4.2V lithium electricity battery connects external direct current power supply channel B AT and is communicated with accumulation of energy inductance L 2 input, when external direct current power supply is introduced from external direct current power supply channel B AT, electric energy is provided by external direct current, external power supply voltage now must be less than 5.3V, accumulation of energy inductance L 2 output is connected with the positive pole of isolating diode D15, the negative pole of isolating diode D15 is connected on power supply output channel 5V passage, accumulation of energy inductance L 2 converts electrical energy into magnetic field energy and stores, after the drain electrode of metal-oxide-semiconductor M5 disconnects, the magnetic field energy of storage is converted to electric field energy by accumulation of energy inductance L 2, and this energy with the supply voltage superposition that inputs on DC power supply channel B AT after by the filtering of isolating diode D15 and electric capacity after obtain level and smooth direct voltage and be supplied to load from load connecting interface X1, the superposition that can be converted to electric energy due to this voltage magnetic figured stone that is 4.2V or input supply voltage and accumulation of energy inductance L 2 is formed afterwards, so export demand voltage+5V higher than input voltage, both the completing of boost process.
Wherein booster circuit comprises: boost chip U4, accumulation of energy inductance L 2, isolating diode D15, filter capacitor C31, C32 and metal-oxide-semiconductor M5 forms, boost chip U4 contains power input port, output port EXT and feedback detection port FB, wherein output port EXT is connected with the control pole G door of metal-oxide-semiconductor M5, export the switch of the signal controlling metal-oxide-semiconductor M5 of PWM, the boost chip U4 dividing potential drop fed back described in test side FB connection detects the dividing point of output level circuit, detect the level that described dividing potential drop detects R27 and the R26 dividing potential drop output of output level circuit, being a bit connected in the positive pole link of the drain electrode of metal-oxide-semiconductor M5 and described inductance L 2 output and isolating diode D15, the negative pole of isolating diode D15 connects electric capacity C31, electric capacity C31 and C32 is connected in parallel over the ground, filtering can be carried out to output voltage, this tie point realizes remaining on a stable output level to output voltage+5V by the switch of the drain electrode to metal-oxide-semiconductor M5, described metal-oxide-semiconductor M5 is N-channel MOS pipe.
Wherein electronic switch comprises: metal-oxide-semiconductor M6, resistance R31, R30 and load connecting interface X1 form, the control pole of metal-oxide-semiconductor M6 is connected with resistance R31 and R30 of described control circuit output, the drain electrode of metal-oxide-semiconductor M6 is connected with the negative terminal OUT-port of load connecting interface X1, after the leakage source conduction of metal-oxide-semiconductor M6, the negative terminal OUT-port voltage flowing to load connecting interface X1 flows to described sampling resistor RS1 to reference ground by the source electrode of metal-oxide-semiconductor M6, the anode of load connecting interface X1 is connected with on described power supply output channel 5V passage, forms current supply circuit.
Wherein circuits for triggering comprise: controllable silicon U7, resistance R16 and diode D11 form, the triggering pin G of controllable silicon U7 is connected with the negative pole of diode D11 by resistance R16, the positive pole of diode D11 is connected to the negative terminal OUT-port of described load connecting interface X1, when there being voltage to arrive OUT-port, trigger controllable silicon U7 conducting by resistance R16 again through diode D11, now the anode A point voltage of controllable silicon U7 is low level 0.
Wherein control circuit comprises: programmable single chip computer MCU, metal-oxide-semiconductor M1, M3, diode D12, triode Q1, Q2, resistance R17, R18, R22 and R23, described programmable single chip computer MCU contains the control output end mouth C0 that can export low and high level, CT1, the AD analog quantity sample port CU of more than CT2 and 8, control output end mouth C0 connects the resistance R31 in described electronic switch, when MCU is to port C0 high level, high level signal makes M6 conducting through resistance R31, control output end mouth CT2 connects the positive pole of diode D12, the negative pole of diode D12 passes through the B pole of resistance R17 connecting triode Q1, the C pole of triode Q1 is connected with the control pole of metal-oxide-semiconductor M1, be connected with the anode A end of described controllable silicon U7 simultaneously, when MCU maintains M1 conducting to port CT2 permanent High level, the source electrode of metal-oxide-semiconductor M1 and resistance R18 are connected in parallel described external direct current power supply channel B AT, control output end mouth CT1 is connected to the B pole of triode Q2 by resistance R22, the C pole of triode Q2 is connected with the control pole of metal-oxide-semiconductor M3, the C pole of triode Q2 and the control pole of metal-oxide-semiconductor M3 are connected to described external direct current power supply channel B AT by resistance R23, when MCU is to port CT1 high level, high level signal makes M3 conducting through resistance R22, described metal-oxide-semiconductor M1 and M3 is P channel MOS tube.
Wherein dynamic current sample circuit comprises: sampling resistor RS1, electric capacity C24 and resistance R28, sampling resistor RS1 is connected on electric power loop, one end of contact resistance R28 after electric capacity C24 is in parallel with sampling resistor RS1, the other end of resistance R28 is connected on the sample port CU of described MCU.
Wherein dividing potential drop detection output level circuit comprises: divider resistance R26 and R27, one end of R26 connects the negative reference point of external direct current power supply passage, and the R26 other end forms component voltage pressure point with one end of R27 and is connected with the feedback test side FB of described boost chip U4.
The control flow of switching circuit, MCU described in initialization makes output port C0, CT1, CT2 is set to high level, CT2 makes metal-oxide-semiconductor M1 keep conducting after being set to high level, to ensure the continued power of MCU, CT1 makes metal-oxide-semiconductor M3 conducting after being set to high level, make described U4 start control booster circuit and the voltage of 4.2V lithium battery is increased to 5V, C0 makes metal-oxide-semiconductor M6 conducting after being set to high level, can charge to portable equipment, MCU dynamically reads and is reached the current value of port CU by described resistance RS1 and calculated, after MCU judges that the read value of CU is less than the limit value of this electronic circuit, MCU makes output port C0, CT1, CT2 is set to low level, the cut-off charging of discharge loop is terminated.
The function that the present invention realizes is as follows:
A kind of Novel electronic switching circuit of the portable power source series products of built-in lithium battery of the present invention, when the confession plug of portable equipment is connected to the power supply base of this Novel electronic switching circuit, this circuit then automatically can be opened and power to portable equipment.Simultaneously programmable single chip computer MCU in the circuit detects the electric current that current supply circuit flows through, when detecting that supply current is less than the current value of product setting, illustrate that external portable equipment satisfies the demands electricity, then MCU disconnects the power supply circuits of this circuit by the electronic switch in this circuit.And make the device in electronic switching circuit be in power-off or Micro Energy Lose state, if when being separated from the power supply base of this Novel electronic switching circuit by the confession plug of portable equipment, this electronic switching circuit then can automatically switch to the state of Micro Energy Lose.The Micro Energy Lose electricity of this electronic switching circuit can be uA level.Make user can repeatedly can continue when the energy content of battery has not made to use this portable power source, achieve the object of low-loss and energy-saving and more convenient for user.
Accompanying drawing explanation
Fig. 1 is Novel electronic switching circuit schematic diagram of the present invention;
Fig. 2 is that the portable power source of usual built-in lithium battery adopts mechanical switch or button-pressing way schematic diagram;
Fig. 3 is Novel electronic switching circuit of the present invention, and boost chip exports the waveform schematic diagram of the switch adjustment output voltage of the signal controlling metal-oxide-semiconductor M5 of PWM;
Fig. 4 is Novel electronic switching circuit of the present invention, the equipment effect schematic diagram containing USB interface of enforcement;
Fig. 5 is the operation logic schematic diagram of Novel electronic switching circuit of the present invention;
Embodiment
The present invention is explained in more detail below in conjunction with reference diagram.
Refer to Fig. 1, a kind of Novel electronic switching circuit of the portable power source series products of built-in lithium battery, comprise: power circuit, booster circuit, electronic switch, circuits for triggering, control circuit, dynamic current sample circuit and dividing potential drop detect output level circuit, described dynamic current sample circuit is connected with the sample port of control circuit, described dividing potential drop detects the feedback test side that output level circuit is connected to booster circuit, the level signal value of control circuit by control output end mouth respectively with the control end of booster circuit, the control end of electronic switch is connected with the control end of circuits for triggering.
In order to further easily to the description of this Novel electronic switching circuit, some components and parts in this circuit are given and specific parameter value, and this does not affect the principle selecting other provided as one homogeneous element can realize this patent object equally.Refer to Fig. 1, if the MCU in control circuit is 8 programmable single chip computer HT46R53, be responsible for the input to circuit and process; U4 in booster circuit is a boost chip S-8355-M20, see Fig. 3, the output port EXT of this chip has the characteristic exporting PWM, the feedback test side FB of this chip can accept the adjustment of a magnitude of voltage for PWM simultaneously, MCU can control this chip and be responsible for output PWM square-wave signal by outbound port EXT, the switch of control M5, and detect output level by R27 and R26 dividing potential drop, make output voltage remain on the output of a voltage stabilizing; M6 is responsible for when not connecing load, cuts off output loop; M3 and M1 uses as switch.
When not connecing load, M1 is that closed condition has cut off external direct current power supply channel B AT, the element that now in electronic circuit, all Vcc of needs power does not work, therefore the self discharge of circuit is very little, please refer to Fig. 1, if R27 is 300K, R26 is 39K, the accumulation of energy inductance L 2 of electric current in power circuit connects R27 and R26 formation loop from diode D15 negative pole again to the positive pole of isolating diode D15, loop current is I=(4.2Vmax-0.7v)/339k=10.32uA, can find out this electronic switching circuit from power consumption at about 10uA.
Refer to Fig. 1, after load connecting interface X1 connects load RL, the electric current of built-in 4.2V lithium electricity battery or external direct current power supply flows into from the port of external direct current power supply passage, the positive pole of isolating diode D15 is flowed through by accumulation of energy inductance L 2, the anode of load connecting interface X1 is arrived again by the negative pole of isolating diode D15, the negative terminal OUT-port of load connecting interface X1 is arrived through overload RL, resistance R16 is flowed to through diode D11 from OUT-port, trigger controllable silicon U7 by resistance R16 and make its conducting, now the anode A point voltage of controllable silicon U7 is low level 0, M1 is P channel MOS, now M1 conducting, the electric current of built-in 4.2V lithium electricity battery or external direct current power supply from external direct current power supply passage by M1 to Vcc, Vcc is supplied to MCU electrifying startup, after MCU starts, a high level is sent to port CT2, maintain M1 conducting, ensure that all elements in circuit are in running order.Now because the anode A point voltage of controllable silicon U7 is moved to about 0.3V by Q1, controllable silicon U7 ends.MCU is to CT1 and C0 high voltage simultaneously, make M3 open-minded, booster circuit works, M6 conducting simultaneously, the voltage flowing to OUT-port forms loop to resistance RS1 to reference signal by M6, simultaneously MCU detects the electric current flowing through loop obtained by sample port CU, and the electric current detected as MCU is greater than more than the current limit that product sets, then MCU maintains each road signal circuit is normally worked.
Otherwise MCU is by detecting the signal of CU, when load current is less than the current limit of product setting, MCU is by detecting the signal of CU, stop the high level exporting each port control signal on C0, CU and CT2, now M3 and M6 is disconnected, circuit auto-breaking, the power consumption electric current of built-in lithium battery is reduced to below 50mA.When delivery outlet load RL disconnects, when the confession plug by portable equipment is separated from the power supply base of this Novel electronic switching circuit, M1, M3, M6 disconnect completely, and all circuit all no longer work, and reach plug and play, from the little object of power consumption.
Application of the present invention is explained in more detail below in conjunction with preferred embodiment.
Please refer to Fig. 4, apply a kind of Novel electronic switching circuit of the portable power source series products of this built-in lithium battery, the Portable power source of design.Its load connecting interface X1 exports and have employed USB interface, when load RL is connected to after on this portable power source, Novel electronic switching circuit on PCBA is started working, until load RL is after the separation of this portable power source, Novel electronic switching circuit on PCBA quits work, its workflow refers to Fig. 5, MicroUSB Interface realization connects the importing of external direct current power supply, have employed Novel electronic switching circuit of the present invention in this Portable power source while, also add by the introducing of MicroUSB socket the charge function of the lithium battery of portable power source.
These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various change, change and omission.Such as, select the components and parts of other similar different parameters also to can be in circuit and realize object set forth in the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. a kind of Novel electronic switching circuit of the portable power source series products of built-in lithium battery, comprise: power circuit, booster circuit, electronic switch, circuits for triggering, control circuit, dynamic current sample circuit and dividing potential drop detect output level circuit, described dynamic current sample circuit is connected with the sample port of control circuit, described dividing potential drop detects the feedback test side that output level circuit is connected to booster circuit boost chip, the level signal of control circuit by control output end mouth respectively with the control end of booster circuit, the control end of electronic switch is connected with the control end of circuits for triggering,
Described power circuit comprises: built-in 4.2V lithium electricity battery, external direct current power supply channel B AT, accumulation of energy inductance L 2, isolating diode D15 and power supply output channel 5V, wherein the positive pole of built-in 4.2V lithium electricity battery connects external direct current power supply channel B AT and is communicated with accumulation of energy inductance L 2 input, accumulation of energy inductance L 2 output is connected with the positive pole of isolating diode D15, and the negative pole of isolating diode D15 is connected on power supply output channel 5V passage;
Described electronic switch comprises: metal-oxide-semiconductor M6, resistance R31, R30 and load connecting interface X1, the control pole of metal-oxide-semiconductor M6 is connected with resistance R31 and R30 of described control circuit output, the drain electrode of metal-oxide-semiconductor M6 is connected with the negative terminal OUT-of load connecting interface X1, the anode of load connecting interface X1 is connected with on described power supply output channel 5V passage, and described metal-oxide-semiconductor M6 is N-channel MOS pipe;
Described booster circuit comprises: boost chip U4, accumulation of energy inductance L 2, isolating diode D15, filter capacitor C31, C32 and metal-oxide-semiconductor M5, boost chip U4 contains power input port, output port EXT and feedback test side FB, wherein output port EXT is connected with the control pole of metal-oxide-semiconductor M5, dividing potential drop described in feedback test side FB connects detects the dividing point of output level circuit, drain electrode and described inductance L 2 output and being a bit connected in isolating diode D15 positive pole link of metal-oxide-semiconductor M5, the negative pole of isolating diode D15 connects electric capacity C31, electric capacity C31 and C32 is connected in parallel signal reference, described output port EXT is with the pattern exporting PWM, described metal-oxide-semiconductor M5 is N-channel MOS pipe,
Described circuits for triggering comprise: controllable silicon U7, resistance R16 and diode D11, and the triggering pin G of controllable silicon U7 is connected with the negative pole of diode D11 by resistance R16, and the positive pole of diode D11 is connected to the negative terminal OUT-port of described load connecting interface X1;
Described control circuit comprises: programmable single chip computer, metal-oxide-semiconductor M1, M3, diode D12, triode Q1, Q2, resistance R17, R18, R22 and R23, described programmable single chip computer contains the control output end mouth C0 that can export low and high level, CT1, the AD analog quantity sample port CU of more than CT2 and 8, control output end mouth C0 connects the resistance R31 in described electronic switch, control output end mouth CT2 connects the positive pole of diode D12, the negative pole of diode D12 passes through the B pole of resistance R17 connecting triode Q1, the C pole of triode Q1 is connected with the control pole of metal-oxide-semiconductor M1, be connected with the anode A end of described controllable silicon U7 simultaneously, the source electrode of metal-oxide-semiconductor M1 and resistance R18 are connected in parallel described external direct current power supply channel B AT, control output end mouth CT1 is connected to the B pole of triode Q2 by resistance R22, the C pole of triode Q2 is connected with the control pole of metal-oxide-semiconductor M3, the C pole of triode Q2 and the control pole of metal-oxide-semiconductor M3 are connected to described external direct current power supply channel B AT by resistance R23, described metal-oxide-semiconductor M1 and M3 is P channel MOS tube,
Described dynamic current sample circuit comprises: sampling resistor RS1, electric capacity C24 and resistance R28, one end of contact resistance R28 after electric capacity C24 is in parallel with sampling resistor RS1, and the other end of resistance R28 is connected on the sample port CU of described programmable single chip computer;
Dividing potential drop detects output level circuit and comprises: one end of divider resistance R26 and R27, R26 connects the negative reference point of external direct current power supply passage, and the R26 other end forms dividing point with one end of R27 and is connected with the feedback test side FB of described boost chip U4.
2. the control flow of a Novel electronic switching circuit, it is characterized in that: comprise Novel electronic switching circuit according to claim 1, programmable single chip computer described in initialization makes output port C0, CT1, CT2 be set to high level, programmable single chip computer dynamically reads and is reached the current value of port CU by described resistance RS1 and calculated, after programmable single chip computer judges that the read value of CU is less than the limit value of this Novel electronic switching circuit, programmable single chip computer makes output port C0, CT1, CT2 be set to low level.
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| CN201110021366.3A CN102611420B (en) | 2011-01-19 | 2011-01-19 | A kind of Novel electronic switching circuit of portable power source series products and control flow thereof |
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| CN102929163B (en) * | 2012-10-26 | 2015-07-15 | 中国兵器工业集团第二一四研究所苏州研发中心 | Power supply electronic switch circuit capable of being automatically controlled and completely powering off |
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Effective date of registration: 20170623 Address after: 536001 workshop A02, CLP Industrial Park, Beihai, Beihai Industrial Park, the Guangxi Zhuang Autonomous Region Patentee after: Beihai Jiaxin Technology Co. Ltd Address before: 518108 building, 1-3 building, third industrial zone, Shiyan Industrial Park, Shiyan Avenue, Shiyan City, Guangdong, Shenzhen, Baoan District, Nangang 5, China Patentee before: Shenzhen Innotech Energy Technology Co., Ltd. |