CN112234666B - Lithium battery charging and discharging circuit of tool lamp - Google Patents

Lithium battery charging and discharging circuit of tool lamp Download PDF

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Publication number
CN112234666B
CN112234666B CN202010922115.1A CN202010922115A CN112234666B CN 112234666 B CN112234666 B CN 112234666B CN 202010922115 A CN202010922115 A CN 202010922115A CN 112234666 B CN112234666 B CN 112234666B
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resistor
capacitor
parallel
circuit
anode
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CN112234666A (en
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马建烽
严文旭
沈焕明
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Ningbo Weijia Electronics Technology Co ltd
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Ningbo Weijia Electronics Technology Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The invention discloses a lithium battery charging and discharging circuit of a tool lamp, which comprises: the charging and discharging circuit, the singlechip power supply circuit and the singlechip control circuit; the single chip microcomputer power supply circuit is connected with the single chip microcomputer control circuit, and the single chip microcomputer control circuit is connected with the charging and discharging circuit; the charging and discharging circuit consists of a power socket, a first inductor, a second diode, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a driving circuit, a follow current circuit, a voltage sampling circuit, a current sampling circuit and a battery; the problem that the existing lithium battery charging and discharging circuit is complex in structure is solved. According to the invention, through the lithium battery charging and discharging circuit, the normal charging and discharging conditions of the lithium battery are ensured, and meanwhile, the structure of the traditional lithium battery charging and discharging circuit is simplified.

Description

Lithium battery charging and discharging circuit of tool lamp
Technical Field
The invention relates to the technical field of lithium battery charging and discharging of tool lamps, in particular to a lithium battery charging and discharging circuit of a tool lamp.
Background
The negative electrode of the lithium ion battery is a graphite crystal, and the positive electrode is usually potassium dioxide. During charging, lithium ions move from the positive electrode to the negative electrode and are inserted into the graphite layer. During discharge, lithium ions are desorbed from the surface of the negative electrode in the graphite crystal and move to the positive electrode. Therefore, lithium always appears in the form of lithium ions, not in the form of metallic lithium, during the charge and discharge of the battery. Such batteries are therefore called lithium batteries. The lithium battery has the advantages of small volume, light weight, no pollution, high single-unit voltage, low self-discharge rate, multiple battery cycle times and the like; nickel-cadmium batteries are being phased out because of their low capacity, severe self-discharge, and environmental pollution; the nickel-cadmium battery has high cost performance and does not pollute the environment, but the voltage of a single battery is only 1.2V, so the application range is limited.
In order to make the lithium battery carry out the charge and discharge process better, the existing lithium battery can be matched with a charge and discharge circuit for use. Most of existing charging and discharging circuits adopt the conduction characteristic of a triode to enable a lithium battery to be charged and discharged, when the lithium battery needs to be charged, negative voltage is input to the base electrode of the NPN triode to cut off the NPN triode, an external power supply is not used for charging the lithium battery, the lithium battery and other electronic devices in the circuit form a discharging circuit to discharge, and the charging circuit and the discharging circuit enable the overall structure of the circuit to be complex.
Disclosure of Invention
The invention aims to provide a lithium battery charging and discharging circuit of a tool lamp, which is used for solving the problem that the existing lithium battery charging and discharging circuit is complex in structure.
In order to achieve the purpose, the invention adopts the technical scheme that:
a lithium battery charging and discharging circuit of a tool lamp, comprising:
the method comprises the following steps: the charging and discharging circuit, the singlechip power supply circuit and the singlechip control circuit;
the single chip microcomputer power supply circuit is connected with the single chip microcomputer control circuit, and the single chip microcomputer control circuit is connected with the charging and discharging circuit;
the charging and discharging circuit consists of a power socket, a first inductor, a second diode, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a driving circuit, a follow current circuit, a voltage sampling circuit, a current sampling circuit and a battery;
a pin of the power socket is connected with a first end of the first inductor, the pin and the pin of the power socket are connected in parallel with a third end of the first inductor, a second end of the first inductor is connected with an anode of the second diode, a cathode of the second diode is connected in parallel with an anode of the fifth capacitor, an anode of the sixth capacitor and the current sampling circuit, and a fourth end of the first inductor is connected in parallel with a cathode of the fifth capacitor and a cathode of the sixth capacitor;
the positive pole of sixth electric capacity with drive circuit with current sampling circuit meets, drive circuit connects in parallel current sampling circuit with the one end of second inductance, the other end of second inductance connects in parallel the positive pole of fourth electric capacity with the positive pole of third electric capacity, the negative pole of third electric capacity with the negative pole of fourth electric capacity connects in parallel in the negative pole of battery, the positive pole of third electric capacity with voltage sampling circuit with the positive pole of battery meets in parallel.
In the above scheme, the driving circuit is composed of a first triode, a second triode, a third triode, a first diode, a second MOS transistor, a tenth resistor, a seventeenth resistor, an eighteenth resistor and a twentieth resistor;
the positive electrode of the sixth capacitor, one end of the tenth resistor and the collector of the first triode are connected in parallel to a circuit power supply voltage, the other end of the tenth resistor is connected in parallel to the base of the first triode, the base of the second triode and the collector of the third triode, the collector of the first triode is connected in parallel to the cathode of the first diode and the source of the second MOS tube, the emitter of the first triode is connected in parallel to the gate of the second MOS tube and the emitter of the second triode, the collector of the second triode and the seventeenth resistor are connected in series to the ground, the emitter of the third triode and one end of the twentieth resistor are connected in parallel to the ground, and the other end of the twentieth resistor is connected in parallel to the base of the third triode and one end of the eighteenth resistor;
the anode of the first diode and the drain of the second MOS tube are connected in parallel to the free-wheeling circuit.
In the above scheme, the follow current circuit is composed of a fourth triode, a fifth triode, a third MOS transistor, a thirteenth resistor, a sixteenth resistor, a nineteenth resistor, a twenty-first resistor, a third diode, a third inductor and a seventh capacitor;
the cathode of the third diode is connected in parallel with the anode of the first diode, the drain of the second MOS tube and one end of the thirteenth resistor, the anode of the third diode is connected in series with the third inductor to the ground, and the other end of the thirteenth resistor is connected in series with the seventh capacitor to the ground;
thirteenth resistance one end connect in parallel the drain electrode of third MOS pipe with the one end of second inductance, the source electrode of third MOS pipe with the collecting electrode of fifth triode connect in parallel the negative pole of battery, the base of third MOS pipe concatenates behind the sixteenth resistance connect in parallel the projecting pole of fourth triode with the projecting pole of fifth triode, the collecting electrode of fourth triode connects chip operating voltage, the collecting electrode of fifth triode concatenates behind the nineteenth resistance with the one end of twenty-first resistance and connect in parallel, the base of fourth triode with the base of fifth triode connect in parallel the other end of twenty-first resistance.
In the above scheme, the voltage sampling circuit is composed of an eleventh resistor, a twelfth resistor, a fourteenth resistor and a fifteenth resistor;
one end of the eleventh resistor and the other end of the twelfth resistor are connected in parallel to the anode of the battery, the other end of the eleventh resistor is connected in parallel to one end of the twelfth resistor, one end of the fourteenth resistor and one end of the fifteenth resistor, the other end of the fourteenth resistor and the other end of the fifteenth resistor are connected in parallel to the ground, and the other end of the twelfth resistor is connected in parallel to the anode of the battery and the other end of the eleventh resistor.
In the above scheme, the current sampling circuit is composed of a tool lamp light source, a first capacitor, a second capacitor, a first MOS transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a ninth resistor;
the anode of the sixth capacitor is connected in parallel to the anode of the second capacitor and the anode of the first capacitor, the cathode of the second capacitor and the cathode of the first capacitor are connected in parallel to the cathode of the battery, the anode of the first capacitor is connected in parallel to the pin and the pin of the tool light source, the pin and the pin of the tool light source are connected in parallel to the drain of the first MOS transistor, the source of the first MOS transistor is connected in parallel to one end of the sixth resistor and one end of the eighth resistor, one end of the sixth resistor is connected in parallel to one end of the first resistor and one end of the third resistor, the other end of the third resistor is connected in parallel to the cathode of the battery, one end of the fifth resistor and one end of the fourth resistor, the other end of the fourth resistor is connected in parallel to one end of the second resistor and the other end of the fifth resistor, and the other end of the second resistor is grounded, one end of the fifth resistor is connected in parallel with the other end of the sixth resistor, the other end of the eighth resistor and one end of the seventh resistor, the other end of the seventh resistor and the other end of the fifth resistor are connected in parallel with the ground, and the gate of the first MOS transistor is connected in series with the ninth resistor.
In the above scheme, the power supply circuit of the single chip microcomputer is composed of a first chip, a fourth diode, a fifth diode, a sixth diode, a twelfth capacitor, a thirteenth capacitor and a fifteenth capacitor;
the pin of the first chip is connected with the anode of the twelfth capacitor, the cathode of the fourth diode and the cathode of the sixth diode in parallel, the anode of the fourth diode is connected with the anode of a battery, the anode of the sixth diode is connected with the anode of the fifth diode in series, the pin of the first chip is connected with the anode of the fifteenth capacitor and the anode of the thirteenth capacitor in parallel, the cathode of the fifteenth capacitor and the cathode of the thirteenth capacitor are connected with the ground in parallel, the anode of the thirteenth capacitor is connected with the working voltage of the chip, and the pin of the first chip is connected with the ground.
In the above scheme, the single chip microcomputer control circuit is composed of a second chip, a third chip, a first switch, a second switch, a thirty-fifth resistor, a forty-third resistor, a forty-fourth resistor, a forty-eighth resistor, an eighteenth capacitor, a nineteenth capacitor, a twentieth capacitor, a twenty-first capacitor, a twenty-second capacitor and a twenty-third capacitor;
a pin of the second chip is connected in series with the second switch and then connected with a pin of the second chip in parallel with one end of a forty-eighth resistor to the ground, the other end of the forty-eighteenth resistor is connected in parallel with one end of the forty-fourth resistor and one end of the first switch, one end of a thirty-fifth resistor is connected with a chip working voltage, the other end of the thirty-fifth resistor is connected in parallel with the other end of the first switch and the other end of the forty-fourth resistor, and a pin of the second chip is connected in parallel with the other end of the first switch;
the pin of the second chip is connected in series with the negative electrodes of the eighteenth capacitor and the nineteenth capacitor, the negative electrode of the twentieth capacitor, the negative electrode of the twenty-first capacitor, the negative electrode of the twenty-second capacitor and the negative electrode of the twenty-third capacitor and is connected in parallel with the anode of the third chip, and the anode of the nineteenth capacitor, the anode of the twentieth capacitor, the anode of the twenty-first capacitor, the anode of the twenty-second capacitor and the anode of the twenty-third capacitor are respectively connected in series with the pin, the pin and the pin of the second chip;
and a pin of the second chip is connected in series with the forty-third resistor and then connected in parallel with a cathode of the third chip, a pin of the second chip is connected in parallel with a reference electrode of the third chip, and a pin of the second chip is connected in series with a cathode of a fifth diode.
In the above scheme, the first triode is an NPN-type triode, the second triode is a PNP-type triode, the third triode is an NPN-type triode, and the second MOS transistor is a P-channel power MOS transistor.
In the above scheme, the fourth triode is an NPN-type triode, the fifth triode is a PNP-type triode, and the third MOS transistor is an N-channel power MOS transistor.
Compared with the traditional technology, the invention at least comprises the following beneficial effects:
the lithium battery charging and discharging circuit mainly comprises a driving circuit, a follow current circuit, a voltage sampling circuit, a current sampling circuit and a battery, the working modes are two modes of voltage reduction charging and voltage reduction discharging tool lamp light source lighting, and through the lithium battery charging and discharging circuit, the power consumption requirement of a tool lamp is met while the normal charging and discharging conditions of the lithium battery are ensured, and the structure of the traditional lithium battery charging and discharging circuit is simplified.
Drawings
FIG. 1 is a schematic diagram of a charging/discharging circuit of a lithium battery charging/discharging circuit of a tool lamp according to the present invention;
FIG. 2 is a schematic diagram of a driving circuit of a lithium battery charging and discharging circuit of a tool lamp according to the present invention;
FIG. 3 is a schematic diagram of a follow current circuit of a lithium battery charging and discharging circuit of a tool lamp according to the present invention;
FIG. 4 is a schematic diagram of a voltage sampling circuit of a lithium battery charging and discharging circuit of a tool lamp according to the present invention;
FIG. 5 is a schematic diagram of a power supply circuit of a single chip microcomputer of a lithium battery charging and discharging circuit of the tool lamp;
FIG. 6 is a schematic diagram of a single chip microcomputer control circuit of a lithium battery charging and discharging circuit of the tool lamp according to the present invention;
FIG. 7 is a schematic diagram of an LED indicator light circuit of a lithium battery charging and discharging circuit of a tool light according to the present invention;
fig. 8 is a schematic diagram of a current sampling circuit of a lithium battery charging and discharging circuit of a tool lamp according to the present invention.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The invention relates to a lithium battery charging and discharging circuit of a tool lamp, which can ensure the normal charging and discharging processes of a lithium battery and simplify the structure of the traditional lithium battery charging and discharging circuit.
Please refer to fig. 1, which is a schematic structural diagram of a charging and discharging circuit of a lithium battery charging and discharging circuit of a tool lamp according to the present invention, the charging and discharging circuit is composed of a power socket DC1, a first inductor L1, a second inductor L2, a second diode D2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a driving circuit, a freewheeling circuit, a voltage sampling circuit, a current sampling circuit, and a battery BT 1;
specifically, the first inductor L1 is a common mode inductor; the second inductor L2 is a magnetic loop inductor;
pin 1 of a power socket DC1 is connected with a first end of a first inductor L1, pin 2 and pin 3 of a power socket DC1 are connected with a third end of the first inductor L1 in parallel, a second end of the first inductor L1 is connected with an anode of a second diode D2, a cathode of the second diode D2 is connected with an anode of a fifth capacitor C5, an anode of a sixth capacitor C6 and a current sampling circuit in parallel, and a fourth end of the first inductor L1 is connected with a cathode of the fifth capacitor C5 and a cathode of the sixth capacitor C6 in parallel;
the positive electrode of the sixth capacitor C6 is connected in parallel with the driving circuit and the current sampling circuit, the driving circuit is connected in parallel with one end of the current sampling circuit and one end of the second inductor L2, the other end of the second inductor L2 is connected in parallel with the positive electrode of the fourth capacitor C4 and the positive electrode of the third capacitor C3, the negative electrode of the third capacitor C3 and the negative electrode of the fourth capacitor C4 are connected in parallel with the negative electrode P & lt- & gt of the battery BT1, and the positive electrode of the third capacitor C3 is connected in parallel with the positive electrode P & lt + & gt of the voltage sampling circuit and the battery BT 1.
Referring to fig. 1, 5 and 6, a lithium battery charging and discharging circuit for a tool lamp includes:
the charging and discharging circuit, the singlechip power supply circuit and the singlechip control circuit;
the singlechip power supply circuit is connected with the singlechip control circuit, and the singlechip control circuit is connected with the charging and discharging circuit;
specifically, the singlechip power supply circuit provides 5V voltage for a second chip U2 in the singlechip control circuit, a cathode of a fifth diode D5 in the singlechip power supply circuit is connected to a pin 6 of the second chip U2, the first chip U1 in the singlechip power supply circuit adopts an HT7550 chip, the second chip U2 in the singlechip control circuit adopts an SB3116 chip, and preferably, the second chip U2 also adopts JF 8300; the singlechip control circuit is responsible for controlling the charge and discharge circuit.
Specifically, referring to fig. 5, the power supply circuit of the single chip microcomputer is composed of a first chip U1, a fourth diode D4, a fifth diode D5, a sixth diode D6, a twelfth capacitor C12, a thirteenth capacitor C13, and a fifteenth capacitor C15;
pin 2 of the first chip U1 is connected in parallel with the anode of the twelfth capacitor C12, the cathode of the fourth diode D4 and the cathode of the sixth diode D6, the anode of the fourth diode D4 is connected in parallel with the anode P + of the battery BT1, the anode of the sixth diode D6 is connected in series with the anode of the fifth diode D5, pin 3 of the first chip U1 is connected in parallel with the anode of the fifteenth capacitor C15 and the anode of the thirteenth capacitor C13, the cathode of the fifteenth capacitor C15 and the cathode of the thirteenth capacitor C13 are connected in parallel with ground, the anode of the thirteenth capacitor C13 is connected with the chip operating voltage VDD, and pin 1 of the first chip U1 is grounded.
Specifically, referring to fig. 6, the single chip microcomputer control circuit is composed of a second chip U2, a third chip U3, a first switch S1, a second switch S2, a thirty-fifth resistor R35, a forty-third resistor R43, a forty-fourth resistor R44, a forty-eighth resistor R48, an eighteenth capacitor C18, a nineteenth capacitor C19, a twentieth capacitor C20, a twenty-first capacitor C21, a twenty-second capacitor C22 and a twenty-third capacitor C23;
pin 3 of the second chip U2 is connected in series with the second switch S2 and then connected in parallel with pin 8 of the second chip U2 and connected with one end of a forty-eight resistor R48 at ground, the other end of the forty-eight resistor R48 is connected in parallel with one end of a forty-fourth resistor R44 and one end of the first switch S1, one end of a thirty-fifth resistor R35 is connected with the chip operating voltage VDD, the other end of the thirty-fifth resistor R35 is connected in parallel with the other end of the first switch S1 and the other end of the forty-fourth resistor R44, and pin 9 of the second chip U2 is connected in parallel with the other end of the first switch S1;
a pin 12 of the second chip U2 is connected in series with the cathode of an eighteenth capacitor C18 and a nineteenth capacitor C19, the cathode of a twentieth capacitor C20, the cathode of a twenty-first capacitor C21, the cathode of a twenty-second capacitor C22 and the cathode of a twenty-third capacitor C23 and is connected in parallel with the anode of the third chip U3, and the anode of the nineteenth capacitor C19, the anode of the twentieth capacitor C20, the anode of the twenty-first capacitor C21, the anode of the twenty-second capacitor C22 and the anode of the twenty-third capacitor C23 are respectively connected in series with a pin 13, a pin 14, a pin 15, a pin 16 and a pin 17 of the second chip U2;
a pin 23 of the second chip U2 is connected in series with the forty-third resistor R43 and then connected to the cathode of the third chip U3, a pin 20 of the second chip U2 is connected to the reference electrode of the third chip U3, and a pin 6 of the second chip U2 is connected in series with the cathode of the fifth diode D5.
Referring to fig. 2, the driving circuit is composed of a first transistor Q1, a second transistor Q2, a third transistor Q3, a first diode D1, a second MOS transistor M2, a tenth resistor R10, a seventeenth resistor R17, an eighteenth resistor R18, and a twentieth resistor R20;
the positive electrode of a sixth capacitor C6, one end of a tenth resistor R10 and the collector of the first triode Q1 are connected in parallel to a circuit power supply voltage VCC, the other end of the tenth resistor R10 is connected in parallel to the base of the first triode Q1, the base of the second triode Q2 and the collector of the third triode Q3, the collector of the first triode Q1 is connected in parallel to the cathode of the first diode D1 and the source of the second MOS transistor M2, the emitter of the first triode Q1 is connected in parallel to the gate of the second MOS transistor M2 and the emitter of the second triode Q2, the collector of the second triode Q2 and a seventeenth resistor R17 are connected in series to ground, the emitter of the third triode Q3 and one end of a twentieth resistor R20 are connected in parallel to ground, and the other end of the twentieth resistor R20 is connected in parallel to the base of the third triode Q3 and one end of an eighteenth resistor R18;
the anode of the first diode D1 and the drain of the second MOS transistor M2 are connected in parallel to the free-wheeling circuit.
The driving circuit is a driving circuit of a second MOS transistor M2, the second MOS transistor M2 is a NCE40P40K field effect MOS transistor and is a P-channel power MOS transistor, the first triode Q1 is an NPN-type triode, the second triode Q2 is a PNP-type triode, the third triode Q3 is an NPN-type triode, and the other end of the eighteenth resistor R18 is connected to the pin 21 of the second chip U2 in the single chip microcomputer control circuit and is used for controlling the second MOS transistor M2 through the single chip microcomputer, so that the turn-off states of the first triode Q1, the second triode Q2 and the third triode Q3 are controlled.
Referring to fig. 3, the continuous current circuit is composed of a fourth triode Q4, a fifth triode Q5, a third MOS transistor M3, a thirteenth resistor R13, a sixteenth resistor R16, a nineteenth resistor R19, a twenty-first resistor R21, a third diode D3, a third inductor L3 and a seventh capacitor C7;
the cathode of the third diode D3 is connected in parallel with the anode of the first diode D1, the drain of the second MOS transistor M2 and one end of the thirteenth resistor R13, the anode of the third diode D3 is connected in series with the third inductor L3 to ground, and the other end of the thirteenth resistor R13 is connected in series with the seventh capacitor C7 to ground;
one end of a thirteenth resistor R13 is connected in parallel with the drain of the third MOS tube M3 and one end of a second inductor L2, the source of the third MOS tube M3 and the collector of the fifth triode Q5 are connected in parallel with the negative electrode P of the battery BT1, the base of the third MOS tube M3 is connected in series with a sixteenth resistor R16 and then connected in parallel with the emitter of the fourth triode Q4 and the emitter of the fifth triode Q5, the collector of the fourth triode Q4 is connected with the chip working voltage VDD, the collector of the fifth triode Q5 is connected in series with a nineteenth resistor R19 and then connected in parallel with one end of the twenty-first resistor R21, and the base of the fourth triode Q4 and the base of the fifth triode Q5 are connected in parallel with the other end of the twenty-first resistor R21;
the follow current circuit is a follow current circuit of the second inductor L2 in a voltage reduction and charge state; when the boost lamp is in a lighting state, the boost lamp is a boost switch circuit, the function of the boost switch circuit is determined according to the flow direction of current, the third MOS transistor M3 is also an NCE40P40K field effect MOS transistor and is an N-channel power MOS transistor, the third inductor L3 is a magnetic bead, the fourth transistor Q4 is an NPN type transistor, the fifth transistor Q5 is a PNP type transistor, and the other end of the twenty-first resistor R21 and the other end of the nineteenth resistor R19 in the freewheel circuit are connected in parallel to the pin 4 of the second chip U2 in the single chip control circuit, so that the third MOS transistor M3 is controlled by the single chip, and the turn-off states of the fourth transistor Q4 and the fifth transistor Q5 are controlled.
Referring to fig. 4, the voltage sampling circuit is composed of an eleventh resistor R11, a twelfth resistor R12, a fourteenth resistor R14 and a fifteenth resistor R15;
one end of an eleventh resistor R11 and the other end of a twelfth resistor R12 are connected in parallel with the positive electrode P + of the battery BT1, the other end of the eleventh resistor R11 is connected in parallel with one end of a twelfth resistor R12, one end of a fourteenth resistor R14 and one end of a fifteenth resistor R15, the other end of the fourteenth resistor R14 and the other end of the fifteenth resistor R15 are connected in parallel with the ground, and the other end of the twelfth resistor R12 is connected in parallel with the positive electrode P + of the battery BT1 and the other end of the eleventh resistor R11.
The eleventh resistor R11, the twelfth resistor R12, the fourteenth resistor R14 and the fifteenth resistor R15 are connected in parallel to the pin 12 of the second chip U2 in the singlechip control circuit, and are used for detecting the voltage division condition of the battery and providing the voltage division condition to the second chip U2.
Referring to fig. 8, the current sampling circuit is composed of a tool lamp light source LED1, a first capacitor C1, a second capacitor C2, a first MOS transistor M1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9;
the anode of the sixth capacitor C6 is connected in parallel to the anode of the second capacitor C2 and the anode of the first capacitor C1, the cathode of the second capacitor C2 and the cathode of the first capacitor C1 are connected in parallel to the cathode P "of the battery BT1, the anode of the first capacitor C1 is connected in parallel to the pin 3 and the pin 4 of the tool light source LED1, the pin 1 and the pin 2 of the tool light source LED1 are connected in parallel to the drain of the first MOS transistor M1, the source of the first MOS transistor M1 is connected in parallel to one end of the sixth resistor R6 and one end of the eighth resistor R8, one end of the sixth resistor R6 is connected in parallel to one end of the first resistor R1 and one end of the third resistor R3, the other end of the third resistor R3 is connected in parallel to the cathode P" of the battery 1, one end of the fifth resistor R5 and one end of the fourth resistor R6852, the other end of the fourth resistor R5475 is connected in parallel to one end of the second resistor R2 and the other end of the fifth resistor R2, and the other end of the resistor R2 is connected in parallel to the ground, The other end of the eighth resistor R8 and one end of the seventh resistor R7, the other end of the seventh resistor R7 and the other end of the fifth resistor R5 are connected in parallel to the ground, and the gate of the first MOS transistor M1 is connected in series with the ninth resistor R9.
The current sampling circuit further comprises a lamp lighting filter circuit and a switch lamp control circuit, the lamp lighting filter circuit is composed of a first capacitor C1 and a second capacitor C2, the switch lamp control circuit is used for carrying out switch control on a tool lamp light source LED1 through a first MOS transistor M1, the other end of a first resistor R1 is connected to a pin 18 of a second chip U2 in the single chip microcomputer control circuit and is responsible for Current Sampling (CSEN), and the other end of a nineteenth resistor R19 is connected to a pin 11 of the second chip U2 in the single chip microcomputer control circuit.
According to the lithium battery charging and discharging circuit of this application, the working method shows for step-down charging and step-up two kinds of states of bright lamp, and concrete theory of operation is as follows:
during voltage reduction and charging, 12V direct current flows through a first inductor L1 through a power socket DC1 for filtering, and then flows through a second diode D2, a filter capacitor, a fifth capacitor C5 and a sixth capacitor C6; the second MOS transistor M2 controls the switching states of the first triode Q1, the second triode Q2 and the third triode Q3 by a single-chip microcomputer control circuit, the current passing through the switching tube is reduced in voltage through the second inductor L2, and the reduced voltage current passes through the fourth capacitor C4 and the third capacitor C3 to charge the battery BT 1; at this time, the second MOS transistor M2 and the third MOS transistor M3 are synchronous switches, and when the second MOS transistor M2 is turned on, the third MOS transistor M3 is turned off; when the third MOS transistor M3 is turned on, the second MOS transistor M2 is turned off. When the current of the second inductor L2 is cut off, the third MOS transistor M3, the fourth transistor Q4 and the fifth transistor Q5 form a freewheeling circuit, and have the same function as the third diode D3, but since the conduction voltage of the MOS transistor is lower than that of the diode, the main bleeding operation is performed on the third MOS transistor M3.
When the lamp is boosted and lighted: the voltage of the battery BT1 reaches the second inductor L2 through the third capacitor C3 and the fourth capacitor C4, the third MOS transistor M3 is controlled by the single chip microcomputer control circuit to be in a switching state by the fourth triode Q4 and the fifth triode Q5, the current passing through the MOS transistor M3 is rectified and boosted by the first diode D1 and the second MOS transistor M2, and the boosted current is filtered by the second capacitor C2 and the first capacitor C1 to supply power to the tool lamp light source LED1 of the current sampling circuit, so that the tool lamp light source LED1 is in a lighting state.
Referring to fig. 7, the LED indicator light circuit is composed of a second indicator light LED2, a third indicator light LED3, a fourth indicator light LED4, a fifth indicator light LED5, a forty-ninth resistor R49, a fifty-first resistor R50, a fifty-first resistor R51, and a fifty-second resistor R52;
one end of a forty-ninth resistor R49 is connected in series with a fifth indicator light LED5 and then grounded, and the other end of the forty-ninth resistor R49 is connected to a pin 1 of a second chip U2 in the singlechip control circuit;
one end of a fifty-th resistor R50 is connected with a fourth indicator light LED4 in series and then grounded, and the other end of the fifty-th resistor R50 is connected with a pin 2 of a second chip U2 in the singlechip control circuit;
one end of a fifty-first resistor R51 is connected with the third indicator light LED3 in series and then grounded, and the other end of the fifty-first resistor R51 is connected with a pin 19 of a second chip U2 in the singlechip control circuit;
one end of the fifty-second resistor R52 is connected in series with the second indicator light LED2 and then grounded, and the other end of the fifty-second resistor R52 is connected to the pin 16 of the second chip U2 in the singlechip control circuit.
Specifically, each indicator represents that each lamp represents 25% of electricity, that is, one indicator is turned on to represent 25% of electricity, 2 indicators are turned on at the same time for 50% of electricity, 3 indicators are turned on at the same time for 75% of electricity, and 4 indicators are turned on at the same time for 100% of electricity. The display will be shown both in the buck charge and boost light conditions.
The lithium battery charging and discharging circuit provided by the embodiment of the invention mainly comprises a driving circuit, a follow current circuit, a voltage sampling circuit, a current sampling circuit and a battery, the working modes are two modes of charging the battery by boosting and discharging by reducing voltage so as to enable a light source of a tool lamp to be lighted, and the lithium battery charging and discharging circuit can meet the power consumption requirement of the tool lamp and simplify the structure of the traditional lithium battery charging and discharging circuit under the condition of ensuring the normal charging and discharging of the lithium battery.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims (8)

1. A lithium battery charging and discharging circuit of a tool lamp is characterized by comprising: the charging and discharging circuit, the singlechip power supply circuit and the singlechip control circuit;
the single chip microcomputer power supply circuit is connected with the single chip microcomputer control circuit, and the single chip microcomputer control circuit is connected with the charging and discharging circuit;
the charging and discharging circuit consists of a power socket DC1, a first inductor L1, a second inductor L2, a second diode D2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a driving circuit, a follow current circuit, a voltage sampling circuit, a current sampling circuit and a battery BT 1;
pin 1 of the power socket DC1 is connected to the first end of the first inductor L1, pin 2 and pin 3 of the power socket DC1 are connected in parallel to the third end of the first inductor L1, the second end of the first inductor L1 is connected to the anode of the second diode D2, the cathode of the second diode D2 is connected in parallel to the anode of the fifth capacitor C5, the anode of the sixth capacitor C6 and the current sampling circuit, and the fourth end of the first inductor L1 is connected in parallel to the cathode of the fifth capacitor C5 and the cathode of the sixth capacitor C6;
the positive electrode of the sixth capacitor C6 is connected in parallel with the driving circuit and the current sampling circuit, the driving circuit is connected in parallel with one end of the current sampling circuit and one end of the second inductor L2, the other end of the second inductor L2 is connected in parallel with the positive electrode of the fourth capacitor C4 and the positive electrode of the third capacitor C3, the negative electrode of the third capacitor C3 and the negative electrode of the fourth capacitor C4 are connected in parallel with the negative electrode P "of the battery BT1, and the positive electrode of the third capacitor C3 is connected in parallel with the positive electrode P + of the voltage sampling circuit and the battery BT 1;
the follow current circuit consists of a fourth triode Q4, a fifth triode Q5, a third MOS transistor M3, a thirteenth resistor R13, a sixteenth resistor R16, a nineteenth resistor R19, a twenty-first resistor R21, a third diode D3, a third inductor L3 and a seventh capacitor C7;
the cathode of the third diode D3 is connected in parallel with the anode of the first diode D1, the drain of the second MOS transistor M2 and one end of the thirteenth resistor R13, the anode of the third diode D3 is connected in series with the third inductor L3 to ground, and the other end of the thirteenth resistor R13 is connected in series with the seventh capacitor C7 to ground;
one end of the thirteenth resistor R13 is connected in parallel to the drain of the third MOS transistor M3 and one end of the second inductor L2, the source of the third MOS transistor M3 and the collector of the fifth triode Q5 are connected in parallel to the negative P-of the battery BT1, the base of the third MOS transistor M3 is connected in series with the sixteenth resistor R16 and then connected in parallel to the emitter of the fourth triode Q4 and the emitter of the fifth triode Q5, the collector of the fourth triode Q4 is connected to the chip working voltage VDD, the collector of the fifth triode Q5 is connected in series with the nineteenth resistor R19 and then connected in parallel to one end of the twenty-first resistor R21, and the base of the fourth triode Q4 and the base of the fifth triode Q5 are connected in parallel to the other end of the twenty-first resistor R21.
2. The lithium battery charging and discharging circuit of the tool lamp as claimed in claim 1, wherein the driving circuit is composed of a first transistor Q1, a second transistor Q2, a third transistor Q3, a first diode D1, a second MOS transistor M2, a tenth resistor R10, a seventeenth resistor R17, an eighteenth resistor R18 and a twentieth resistor R20;
the anode of the sixth capacitor C6 is connected to the circuit supply voltage VCC in parallel with one end of the tenth resistor R10 and the collector of the first transistor Q1, the other end of the tenth resistor R10 is connected in parallel to the base of the first transistor Q1, the base of the second transistor Q2 and the collector of the third transistor Q3, the collector of the first transistor Q1 is connected in parallel with the cathode of the first diode D1 and the source of the second MOS transistor M2, the emitter of the first transistor Q1 is connected in parallel with the gate of the second MOS transistor M2 and the emitter of the second transistor Q2, the collector of the second transistor Q2 and the seventeenth resistor R17 are connected in series with the ground, the emitter of the third transistor Q3 and one end of the twentieth resistor R20 are connected in parallel with the ground, the other end of the twentieth resistor R20 is connected in parallel to the base of the third triode Q3 and one end of the eighteenth resistor R18;
the anode of the first diode D1 and the drain of the second MOS transistor M2 are connected in parallel to the free-wheeling circuit.
3. The lithium battery charging and discharging circuit of the tool lamp as claimed in claim 1, wherein the voltage sampling circuit is composed of an eleventh resistor R11, a twelfth resistor R12, a fourteenth resistor R14 and a fifteenth resistor R15;
one end of the eleventh resistor R11 and the other end of the twelfth resistor R12 are connected in parallel to the positive electrode P + of the battery BT1, the other end of the eleventh resistor R11 is connected in parallel to one end of the twelfth resistor R12, one end of the fourteenth resistor R14 and one end of the fifteenth resistor R15, the other end of the fourteenth resistor R14 and the other end of the fifteenth resistor R15 are connected in parallel to the ground, and the other end of the twelfth resistor R12 is connected in parallel to the positive electrode P + of the battery BT1 and the other end of the eleventh resistor R11.
4. The lithium battery charging and discharging circuit of the tool lamp as claimed in claim 1, wherein the current sampling circuit is composed of a tool lamp light source LED1, a first capacitor C1, a second capacitor C2, a first MOS transistor M1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a ninth resistor R9;
the anode of the sixth capacitor C6 is connected in parallel to the anode of the second capacitor C2 and the anode of the first capacitor C1, the cathode of the second capacitor C2 and the cathode of the first capacitor C1 are connected in parallel to the cathode P of the battery BT1, the anode of the first capacitor C1 is connected in parallel to the pin 3 and the pin 4 of the tool light source LED1, the pin 1 and the pin 2 of the tool light source LED1 are connected in parallel to the drain of the first MOS transistor M1, the source of the first MOS transistor M1 is connected in parallel to one end of the sixth resistor R6 and one end of the eighth resistor R8, one end of the sixth resistor R6 is connected in parallel to one end of the first resistor R1 and one end of the third resistor R3, the other end of the third resistor R3 is connected in parallel to the cathode P of the battery 1, one end of the fifth resistor R5 and the other end of the fourth resistor R4, and the other ends of the fourth resistor R38 4 and the second resistor R3646, the other end of the second resistor R2 is grounded, one end of the fifth resistor R5 is connected in parallel to the other end of the sixth resistor R6, the other end of the eighth resistor R8 and one end of the seventh resistor R7, the other end of the seventh resistor R7 and the other end of the fifth resistor R5 are connected in parallel to the ground, and the gate of the first MOS transistor M1 is connected in series with the ninth resistor R9.
5. The lithium battery charging and discharging circuit of the tool lamp as claimed in claim 1, wherein the power supply circuit of the single chip microcomputer is composed of a first chip U1, a fourth diode D4, a fifth diode D5, a sixth diode D6, a twelfth capacitor C12, a thirteenth capacitor C13 and a fifteenth capacitor C15;
pin 2 of the first chip U1 is connected in parallel with the anode of the twelfth capacitor C12, the cathode of the fourth diode D4 and the cathode of the sixth diode D6, the anode of the fourth diode D4 is connected in parallel with the anode P + of the battery BT1, the anode of the sixth diode D6 is connected in series with the anode of the fifth diode D5, pin 3 of the first chip U1 is connected in parallel with the anode of the fifteenth capacitor C15 and the anode of the thirteenth capacitor C13, the cathode of the fifteenth capacitor C15 and the cathode of the thirteenth capacitor C13 are connected in parallel with ground, the anode of the thirteenth capacitor C13 is connected to the chip operating voltage VDD, and pin 1 of the first chip U1 is connected to ground.
6. The lithium battery charging and discharging circuit of the tool lamp as claimed in claim 1 or 5, wherein the single chip microcomputer control circuit is composed of a second chip U2, a third chip U3, a first switch S1, a second switch S2, a thirty-fifth resistor R35, a forty-third resistor R43, a forty-fourth resistor R44, a forty-eighth resistor R48, an eighteenth capacitor C18, a nineteenth capacitor C19, a twentieth capacitor C20, a twenty-first capacitor C21, a twenty-second capacitor C22 and a twenty-third capacitor C23;
pin 3 of the second chip U2 is connected in series with the second switch S2 and pin 8 of the second chip U2 and is connected to one end of the forty-eighth resistor R48 in ground, the other end of the forty-eighth resistor R48 is connected to one end of the forty-fourth resistor R44 and one end of the first switch S1 in parallel, one end of the thirty-fifth resistor R35 is connected to a chip operating voltage VDD, the other end of the thirty-fifth resistor R35 is connected to the other end of the first switch S1 and the other end of the forty-fourth resistor R44 in parallel, and pin 9 of the second chip U2 is connected to the other end of the first switch S1 in parallel;
the pin 12 of the second chip U2 is connected in series with the negative electrodes of the eighteenth capacitor C18 and the nineteenth capacitor C19, the negative electrode of the twentieth capacitor C20, the negative electrode of the twenty-first capacitor C21, the negative electrode of the twenty-second capacitor C22, and the negative electrode of the twenty-third capacitor C23, and is connected in parallel with the anode of the third chip U3, and the anode of the nineteenth capacitor C19, the anode of the twentieth capacitor C20, the anode of the twenty-first capacitor C21, the anode of the twenty-second capacitor C22, and the anode of the twenty-third capacitor C23 are connected in series with the pin 13, the pin 14, the pin 15, the pin 16, and the pin 17 of the second chip U2, respectively;
the pin 23 of the second chip U2 is connected in series with the forty-third resistor R43 and then connected in parallel with the cathode of the third chip U3, the pin 20 of the second chip U2 is connected in parallel with the reference electrode of the third chip U3, and the pin 6 of the second chip U2 is connected in series with the cathode of the fifth diode D5.
7. The lithium battery charging and discharging circuit of the tool light as claimed in claim 2, wherein the first transistor Q1 is an NPN type transistor, the second transistor Q2 is a PNP type transistor, the third transistor Q3 is an NPN type transistor, and the second MOS transistor M2 is a P-channel power MOS transistor.
8. The lithium battery charging and discharging circuit of the tool light as claimed in claim 1, wherein the fourth transistor Q4 is an NPN type transistor, the fifth transistor Q5 is a PNP type transistor, and the third MOS transistor M3 is an N-channel power MOS transistor.
CN202010922115.1A 2020-09-04 2020-09-04 Lithium battery charging and discharging circuit of tool lamp Active CN112234666B (en)

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