CN210273550U - Novel 0V charging circuit - Google Patents

Novel 0V charging circuit Download PDF

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Publication number
CN210273550U
CN210273550U CN201921360831.4U CN201921360831U CN210273550U CN 210273550 U CN210273550 U CN 210273550U CN 201921360831 U CN201921360831 U CN 201921360831U CN 210273550 U CN210273550 U CN 210273550U
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resistor
charging
circuit
diode
electrode
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徐国红
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Shenzhen Tianbangda Technology Co ltd
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Shenzhen Tianbangda Technology Co ltd
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Abstract

A novel 0V charging circuit comprises a charging main loop, a charging control circuit and a BMS circuit power supply circuit, wherein the charging main loop, the charging control circuit and the BMS circuit power supply circuit are electrically connected in sequence; the main charging loop comprises MOS (metal oxide semiconductor) transistors Q1 and Q2, resistors R3, R4, R5 and R6 and a diode D1; the resistor R6 is connected with the source electrode of the MOS transistor Q1 and then is connected with the output voltage C + of the charger; after the resistors R3, R4 and R5 are connected with the MOS transistor Q2 in parallel, one end of the resistor is connected with the drain electrode of the MOS transistor Q1, the other end of the resistor is connected with the negative electrode of the diode D1, and the positive electrode of the diode D1 is connected with the negative electrode of the rechargeable battery BAT + to charge the interior of the rechargeable battery. The utility model discloses do the pulse undercurrent to 0V battery and charge, have the guard action to the charger, charge in addition and begin, LDO obtains normal voltage output for the BMS circuit gets into normal operating condition immediately.

Description

Novel 0V charging circuit
Technical Field
The utility model relates to a charge control circuit field, concretely relates to novel 0V charging circuit.
Background
At present, the domestic lithium battery industry develops rapidly, and a large number of lithium batteries are used in various electric equipment every year. With the continuous maturity of the technology of lithium ion power batteries, lithium batteries are combined into battery packs with different voltages and capacities through series-parallel connection, and through the development of several years, the lithium batteries are applied to products such as electric bicycles, electric motorcycles, UPS power supplies and the like in a large scale.
The lithium battery cell and the BMS circuit are assembled together to be referred to as a battery pack, and they are integrated into one body. The BMS circuit monitors the electric quantity, voltage and current of the battery, and protects the battery core under various abnormal conditions. There are cases where the battery pack is not used for a long period of time, since the BMS circuit also needs to consume the current of the battery, it is likely to discharge the battery voltage to a very low voltage. Under the condition that the cell voltage is very low, the BMS circuit cannot normally work at the moment, and the cell voltage is still discharged all the time and approaches to 0V voltage. This brings about two problems, one is that the BMS circuit cannot normally operate, and the other is that the cell voltage approaches 0V voltage.
Due to the electrochemical principle, the cell is not allowed to be charged with large current under the condition of low voltage, otherwise, the battery is easily charged. In the existing 0V battery charging mode, a charger is directly used for charging, charging current can directly flow into a battery cell, the voltage of the charger can be directly pulled to be very low under the condition that the voltage of the battery cell is very low, and some chargers are easy to damage; on the other hand, although the battery is charged, the battery voltage is low, so that the power supply circuit LDO of the BMS circuit cannot normally output the required voltage, and thus the BMS circuit cannot enter a normal operating state, cannot monitor data such as voltage and current of the battery cell, and cannot protect the battery from an abnormal state.
Publication No. CN203233212U discloses a 0V charging control circuit of a lithium power battery pack, which includes a detection and protection control circuit, a charging loop turn-off circuit and a 0V charging control circuit electrically connected in sequence. The charging loop turn-off circuit comprises a field effect transistor M1, a diode D1, a resistor R1 and a voltage stabilizing diode D2, wherein a first end and a second end of the detection and protection control circuit are respectively connected to the positive end and the negative end of the lithium battery pack in parallel, the output end of the detection and protection control circuit is connected with the diode D1 in series, then the output end of the detection and protection control circuit is connected with a G end of a field effect transistor M1, one end of a resistor R1 and the negative end of a voltage stabilizing diode D2, a D end of the field effect transistor M1 is connected with the negative end of the lithium battery pack, and an S end of the field effect transistor M1 is connected with the other end of a resistor R1 and the; the 0V charging control circuit is realized by a capacitance resistance device.
The present inventors have recognized that the above technical solution does not solve the problem of causing the BMS circuit to operate normally as soon as the 0V charge is started.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to provide a novel 0V charging circuit, solve the problem that the present 0V charges and exists: when the charging is started, the BMS circuit cannot be immediately brought into a normal operating state.
In order to achieve the above purpose, the utility model adopts the technical scheme that: the novel 0V charging circuit comprises a charging main loop, a charging control circuit and a BMS circuit power supply circuit, wherein the charging main loop, the charging control circuit and the BMS circuit power supply circuit are electrically connected in sequence; wherein:
the main charging loop comprises MOS (metal oxide semiconductor) transistors Q1 and Q2, resistors R3, R4, R5 and R6 and a diode D1; the resistor R6 is connected with the source electrode of the MOS transistor Q1 and then is connected with the output voltage C + of the charger; after the resistors R3, R4 and R5 are connected with the MOS transistor Q2 in parallel, one end of the resistor is connected with the drain electrode of the MOS transistor Q1, the other end of the resistor is connected with the negative electrode of the diode D1, and the positive electrode of the diode D1 is connected with the negative electrode of the rechargeable battery BAT + to charge the rechargeable battery;
the charging control circuit comprises resistors R1, R2, R7, R8, R9, R10, R11, R12 and R13, triodes Q3 and Q4 and a voltage stabilizing diode D4; one end of the resistor R1 is connected with the output voltage C + of the charger, and the other end is respectively connected with the single chip microcomputer ADC and one end of the resistor R2; the other end of the resistor R2 is grounded; one end of the resistor R8 is connected with a singlechip signal CHG _ PWM, and the other end of the resistor R9 is connected with one end of the resistor R8 and then is connected with the base electrode of the triode Q3; a collector of the triode Q3 is connected with one end of the resistor R7, and an emitter of the triode Q3 is connected with the other end of the resistor R9 and then grounded; the other end of the resistor R7 is connected with the grid electrode of the MOS transistor Q1; after the resistor R10 is connected in parallel with the voltage-stabilizing diode D4, one end of the resistor R10 is respectively connected with the source electrode of the MOS transistor Q2 and the drain electrode of the MOS transistor Q1, the other end of the resistor R11 is respectively connected with the grid electrode of the MOS transistor Q2 and one end of the resistor R11, the other end of the resistor R11 is connected with the collector electrode of the triode Q4, the emitter electrode of the triode Q4 is connected with one end of the resistor R13 and then grounded, the base electrode of the triode Q4 is connected with the other end of the resistor R13 and then connected with the resistor R12 in series, and the other end of the resistor R12 is connected with a single-chip microcomputer signal 0V;
the BMS circuit power supply circuit comprises a chip U1, capacitors C21, C13 and C31, and diodes D2 and D3; the chip U1 interface VOUT is connected with one end of the capacitor C31 and then connected with one end of the capacitor C13; the other end of the capacitor C13 is connected with the other end of the capacitor C31, then connected with the chip U1 interface GND and then grounded; one end of the capacitor C21 is connected with the interface GND of the chip U1 and then grounded; after the interface VIN of the chip U1 is connected to the other end of the capacitor C21, the chip U1 is connected to the anodes of the diode D2 and the diode D3, respectively, the cathode of the diode D2 is connected to the charger output voltage C +, and the cathode of the diode D3 is connected to the battery BAT +.
Further, the chip U1 is an LDO voltage regulation IC, and the output voltage VOUT of the chip U1 interface is +5V, and is used for supplying power to a BMS circuit.
Further, the MOS tubes Q1 and Q2 are P-channel MOS tubes.
Further, the output voltage of the main charging loop is 6V at minimum.
The beneficial effects of the utility model reside in that, the utility model provides a pair of novel 0V charging circuit does the pulse undercurrent to 0V battery and charges, guarantees electric core charging safety, can not directly draw charger voltage very low, has the guard action to the charger, and at first, LDO obtains normal voltage output for the BMS circuit gets into normal operating condition immediately, plays the control detection effect to charging voltage, the voltage of battery, electric current etc. and the guard action to electric core under the abnormal conditions.
Drawings
The invention is further described below with reference to the accompanying drawings of the specification:
fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The technical solution of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, a novel 0V charging circuit includes a main charging loop, a charging control circuit, and a BMS circuit power supply circuit, wherein the main charging loop, the charging control circuit, and the BMS circuit power supply circuit are electrically connected in sequence; wherein:
the main charging loop comprises MOS (metal oxide semiconductor) transistors Q1 and Q2, resistors R3, R4, R5 and R6 and a diode D1; the R6 is connected with the source of the Q1 and then is connected with the output voltage C + of the charger; after R3, R4, R5 and Q2 are connected in parallel, one end of the R is connected with the drain electrode of Q1, the other end of the R is connected with the negative electrode of D1, and the positive electrode of D1 is connected with the negative electrode of a rechargeable battery BAT + to charge the interior of the rechargeable battery;
the charging control circuit comprises resistors R1, R2, R7, R8, R9, R10, R11, R12 and R13, triodes Q3 and Q4 and a voltage stabilizing diode D4; one end of R1 is connected with the output voltage C + of the charger, and the other end is connected with one end of the single chip microcomputer ADC and one end of R2 respectively; the other end of R2 is grounded; one end of the R8 is connected with the singlechip signal CHG _ PWM, and the other end is connected with one end of the R9 and then connected with the base electrode of the Q3; the collector of the Q3 is connected with one end of the R7, and the emitter of the Q3 is connected with the other end of the R9 and then grounded; the other end of the R7 is connected with the grid of the Q1; after the R10 and the D4 are connected in parallel, one end of the R10 is connected with a source electrode of Q2 and a drain electrode of Q1 respectively, the other end of the R11 is connected with a grid electrode of Q2 and one end of R11 respectively, the other end of the R11 is connected with a collector electrode of Q4, an emitter electrode of Q4 is connected with one end of R13 and then grounded, a base electrode of Q4 is connected with the other end of R13 and then connected with R12 in series, and the other end of R12 is connected with a single chip microcomputer signal 0V _;
the BMS circuit power supply circuit comprises a chip U1, capacitors C21, C13 and C31, and diodes D2 and D3; the U1 interface VOUT is connected with one end of the C31 and then connected with one end of the C13; the other end of the C13 is connected with the other end of the C31, then connected with a U1 interface GND and then grounded; one end of the C21 is connected with the U1 interface GND and then grounded; after the U1 interface VIN is connected with the other end of the C21, the U1 interface VIN is respectively connected with the anodes of D2 and D3, the cathode of D2 is connected with the output voltage C + of the charger, and the cathode of D3 is connected with the BAT +.
Preferably, the chip U1 is an LDO regulator IC, and the chip U1 interface VOUT output voltage is +5V for supplying power to the BMS circuit.
Preferably, the MOS transistors Q1 and Q2 are P-channel MOS transistors.
The utility model discloses a 0V charging realization method and principle explain as follows:
the safe charging process of the battery: between the positive battery terminal BAT + and the positive charger output terminal C +, Q1, R3, R4, R5 connected in parallel, and a Q2 connected in parallel are connected. Q1 is controlled by Q3, and Q3 is controlled by signal CHG _ PWM sent by the single-chip microcomputer. The whole battery is charged from 0V in different processes, so that the safety charging of the battery is well ensured: (1) the charging is carried out in a small current 0.2C + pulse mode, and when the voltage of each string of batteries is less than 2.0V (which can be set according to different battery core chemical requirements), the batteries are charged as 0V batteries. And charging by adopting a small-current 0.2C + pulse mode. The small current is limited mainly by R3, R4 and R5, and the pulse is controlled by a PWM signal sent by CHG _ PWM; (2) and (4) charging in a constant current mode, wherein when the voltage of each battery string is more than 2.0V, the batteries are charged in the constant current mode. CHG _ PWM asserts a high signal to close Q1 on all the time. In addition, Q2 connected in parallel with R3, R4 and R5 is always in a closed conducting state. The Q2 is controlled by a 0V _ CHG signal sent by the singlechip; (3) constant voltage mode charging, when the battery is charged to a nearly full charge voltage, such as: 4.0V or 4.2V (can be set according to different battery cell chemical requirements), and the function is generally realized by a charger from constant current to constant voltage.
0V charging, description of use safety protection of charger: from the above analysis, it is seen that in the 0V battery stage, since the three resistors R3, R4, R5 are connected in series between the battery BAT + and the charge output C +, there is a minimum voltage drop of about 6V across the three resistors R3, R4, R5, that is, even if the battery voltage is 0V, the minimum charge output voltage is 6V. The voltage of the charger is not pulled very low, and the use of the charger is safe.
0V charge, initial, BMS part description of normal operation: (1) when the charger starts charging, the voltage output by the charger supplies power to the chip U1 through the D2. In design, the minimum voltage of the charger is ensured to be more than 6V by parameter design of R3, R4 and R5, and the requirement of the minimum input voltage required by U1 is provided. U1 just can normally export 5V stable voltage, and BMS circuit supply voltage is normal, and like this with the circuit that BMS circuit part is relevant, including voltage current acquisition module, singlechip etc. all work normally. The voltage and current acquisition module works normally, so that the voltage, the current and other data of the battery can be acquired and provided for the single chip microcomputer to be analyzed and processed. The singlechip normally works, can send out various correct logic control signals, and can also indicate the working state of the battery through the LED lamp and the like. (2) Before the U1 input power supply, D2 and D3 are connected, and the power is respectively from a battery BAT + and a charger. During the 0V charging phase, power is supplied by the charger providing U1. The logical OR relationship between D2 and D3 is that which circuit is high and which circuit is powered. When the charger is unplugged, power is supplied to the U1 from BAT + via D3.
The embodiments of the present invention have been described in detail, but the invention is not limited to the embodiments, and those skilled in the art can make many equivalent modifications or substitutions without departing from the spirit of the present invention, and the equivalent modifications or substitutions are included in the scope of protection defined by the claims of the present application.

Claims (4)

1. The utility model provides a novel 0V charging circuit, characterized by: the charger comprises a charging main loop, a charging control circuit and a BMS circuit power supply circuit, wherein the charging main loop, the charging control circuit and the BMS circuit power supply circuit are electrically connected in sequence; wherein:
the main charging loop comprises MOS (metal oxide semiconductor) transistors Q1 and Q2, resistors R3, R4, R5 and R6 and a diode D1; the resistor R6 is connected with the source electrode of the MOS transistor Q1 and then is connected with the output voltage C + of the charger; after the resistors R3, R4 and R5 are connected with the MOS transistor Q2 in parallel, one end of the resistor is connected with the drain electrode of the MOS transistor Q1, the other end of the resistor is connected with the negative electrode of the diode D1, and the positive electrode of the diode D1 is connected with the negative electrode of the rechargeable battery BAT + to charge the rechargeable battery;
the charging control circuit comprises resistors R1, R2, R7, R8, R9, R10, R11, R12 and R13, triodes Q3 and Q4 and a voltage stabilizing diode D4; one end of the resistor R1 is connected with the output voltage C + of the charger, and the other end is respectively connected with the single chip microcomputer ADC and one end of the resistor R2; the other end of the resistor R2 is grounded; one end of the resistor R8 is connected with a singlechip signal CHG _ PWM, and the other end of the resistor R9 is connected with one end of the resistor R8 and then is connected with the base electrode of the triode Q3; the collector of the triode Q3 is connected with one end of the resistor R7, and the emitter of the triode Q3 is connected with the other end of the resistor R9 and then grounded; the other end of the resistor R7 is connected with the grid electrode of the MOS transistor Q1; after the resistor R10 is connected in parallel with the voltage-stabilizing diode D4, one end of the resistor R10 is respectively connected with the source electrode of the MOS transistor Q2 and the drain electrode of the MOS transistor Q1, the other end of the resistor R11 is respectively connected with the grid electrode of the MOS transistor Q2 and one end of the resistor R11, the other end of the resistor R11 is connected with the collector electrode of the triode Q4, the emitter electrode of the triode Q4 is connected with one end of the resistor R13 and then grounded, the base electrode of the triode Q4 is connected with the other end of the resistor R13 and then connected with the resistor R12 in series, and the other end of the resistor R12 is connected with a single-chip microcomputer signal 0V;
the BMS circuit power supply circuit comprises a chip U1, capacitors C21, C13 and C31, and diodes D2 and D3; the chip U1 interface VOUT is connected with one end of the capacitor C31 and then connected with one end of the capacitor C13; the other end of the capacitor C13 is connected with the other end of the capacitor C31, then connected with the chip U1 interface GND and then grounded; one end of the capacitor C21 is connected with the interface GND of the chip U1 and then grounded; after the interface VIN of the chip U1 is connected to the other end of the capacitor C21, the chip U1 is connected to the anodes of the diode D2 and the diode D3, respectively, the cathode of the diode D2 is connected to the charger output voltage C +, and the cathode of the diode D3 is connected to the battery BAT +.
2. The novel 0V charging circuit of claim 1, wherein: the chip U1 is LDO steady voltage IC, chip U1 interface VOUT output voltage is +5V for supply power for the BMS circuit.
3. The novel 0V charging circuit of claim 1, wherein: the MOS tubes Q1 and Q2 are P-channel MOS tubes.
4. The novel 0V charging circuit of claim 1, wherein: the output voltage of the charging main loop is 6V at minimum.
CN201921360831.4U 2019-08-20 2019-08-20 Novel 0V charging circuit Active CN210273550U (en)

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Application Number Priority Date Filing Date Title
CN201921360831.4U CN210273550U (en) 2019-08-20 2019-08-20 Novel 0V charging circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921360831.4U CN210273550U (en) 2019-08-20 2019-08-20 Novel 0V charging circuit

Publications (1)

Publication Number Publication Date
CN210273550U true CN210273550U (en) 2020-04-07

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Application Number Title Priority Date Filing Date
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