CN217115658U - Charging voltage range detection protection circuit - Google Patents
Charging voltage range detection protection circuit Download PDFInfo
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- CN217115658U CN217115658U CN202123433822.3U CN202123433822U CN217115658U CN 217115658 U CN217115658 U CN 217115658U CN 202123433822 U CN202123433822 U CN 202123433822U CN 217115658 U CN217115658 U CN 217115658U
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Abstract
The utility model discloses a charging voltage range detects protection circuit. The protection circuit comprises a battery core package, a charging voltage detection circuit, a power supply control circuit and a charging terminal, wherein the battery core package is respectively connected with the charging voltage detection circuit and the power supply control circuit, and the charging voltage detection circuit and the power supply control circuit are both connected with the charging terminal. The utility model discloses be used for solving among the prior art overcharge protection and only be the protection to the upper limit that charges, can't detect the qualified problem of output voltage scope of charger.
Description
Technical Field
The utility model belongs to the lithium ion battery field, concretely relates to charging voltage range detects protection circuit.
Background
With the increasingly wide application of lithium ion batteries, the lithium ion batteries are increasingly applied to power battery systems, such as electric tools, dust collectors and the like; many strings of power class battery package possess great capacity, if use the charging voltage of irregularity and lead to the loss that can't be retrieved to the explosion then can produce, in order to realize safe handling, the output voltage of monitoring access battery charger is then crucial in the lithium cell, makes whole BMS system effectively manage protection circuit to guarantee the normal life and the security performance of lithium cell.
At present, most of the charging protection aiming at the lithium battery pack in the market is overcharge protection, but the overcharge protection is only protection aiming at the charging upper limit, whether the output voltage range of the charger is qualified cannot be detected, the protection is not comprehensive enough, and the wide market demand cannot be met easily.
SUMMERY OF THE UTILITY MODEL
The utility model provides a charging voltage scope detects protection circuit for overcharge protection only is the protection to the upper limit of charging among the solution prior art, can't detect the qualified problem of output voltage scope of charger.
The utility model discloses a following technical scheme realizes:
the utility model provides a charging voltage scope detects protection circuit, protection circuit includes electric core package, charging voltage detection circuitry, power control circuit and charging terminal, electric core package is connected with charging voltage detection circuitry and power control circuit respectively, charging voltage detection circuitry and power control circuit all are connected with the charging terminal.
Further, the positive voltage end of the electric core package is connected with one end of a power supply control circuit, and the other end of the power supply control circuit is respectively connected with the positive voltage end of the charging terminal and one end of the charging voltage detection circuit;
the other end of the charging voltage detection circuit is connected with the fourth end of the power supply control circuit;
and the negative end of the battery pack is respectively connected with the third end of the charging voltage detection circuit, the third end of the power supply control circuit and the negative end of the charging terminal.
Furthermore, the charging voltage detection circuit comprises a high voltage detection circuit, a low voltage detection circuit and a power supply voltage stabilizing circuit,
the electric energy enters the high-voltage detection circuit and the low-voltage detection circuit through the power voltage stabilizing circuit, the electric energy enters the power control circuit through the high-voltage detection circuit and the low-voltage detection circuit, and the electric energy enters the battery cell pack through the power control circuit.
Further, the power voltage stabilizing circuit comprises a resistor R21 and a zener diode DZ1, the positive voltage end of the charging terminal is connected with one end of the resistor R21, the other end of the resistor R21 is respectively connected with one end of the zener diode DZ1 and the input end of the high voltage detection circuit, and the other end of the zener diode DZ1 is grounded.
Further, the high voltage detection circuit comprises a resistor R13, a resistor R14, a resistor R17, a comparator U1A and a diode D1; one end of the resistor R13 is connected with a voltage VCC end and one end of a voltage stabilizing diode DZ1, the other end of the resistor R13 is connected with one end of the resistor R14, one end of the resistor R17 and the No. 3 end of the comparator U1A, the other end of the resistor R14 is grounded, the other end of the resistor R17 is connected with one end of the diode D1, the other end of the diode D1 is connected with the No. 1 end of the comparator U1A and the input end of the power supply control circuit, and the No. 4 end of the comparator U1A is grounded.
Furthermore, the positive voltage end of the charging terminal is connected with one end of a resistor R11, the other end of the resistor R11 is respectively connected with one end of a resistor R12, the No. 2 end of a comparator U1A, one end of a resistor R18 and the No. 5 end of a comparator U1B, the other end of the resistor R12 is grounded,
the low-voltage detection circuit comprises a resistor R15, a resistor R16, a resistor R18, a comparator U1B and a diode D2; the other end of resistance R18 is connected with diode D2's one end, diode D2's the other end is connected with comparator U1B's No. 7 end and power control circuit's input respectively, resistance R15's one end is connected with voltage VCC end, resistance R15's the other end is connected with resistance R16's one end and comparator U1A's No. 6 end respectively, resistance R16's the other end is connected with the negative pressure end of charging terminal, simultaneously ground connection.
Further, the charging voltage detection circuit comprises a field effect transistor Q1, a field effect transistor Q2, a field effect transistor Q3, a resistor R19, a resistor R20, a resistor R22, a voltage stabilizing diode DZ2 and a voltage stabilizing diode DZ 3;
the D end of the field-effect transistor Q3 is respectively connected with the positive voltage end of a charging terminal, one end of a voltage stabilizing diode DZ2 and one end of a resistor R22, the S end of the field-effect transistor Q3 is connected with the positive voltage end of a battery pack, and the other end of the voltage stabilizing diode DZ2 is respectively connected with the other end of the resistor R22, the G end of the field-effect transistor Q3 and the D end of the field-effect transistor Q1;
the G end of the field effect transistor Q1 is respectively connected with the other end of the diode D1, the No. 1 end of the comparator U1A and one end of the resistor R19, and the other end of the resistor R19 is grounded;
the S end of the field-effect tube Q1 is respectively connected with one end of a voltage-stabilizing diode DZ3 and the D end of the field-effect tube Q2, the G end of the field-effect tube Q2 is respectively connected with the other end of a diode D2, the No. 7 end of a comparator U1B and one end of a resistor R20, and the other end of the resistor R20 is respectively connected with the negative voltage end of a charging terminal, the S end of the field-effect tube Q2, the other end of the voltage-stabilizing diode DZ3 and the negative voltage end of the battery cell pack.
Further, the battery cell pack is formed by connecting a plurality of lithium battery cells in series.
The utility model has the advantages that:
the utility model discloses an effectively solved the problem that present many strings number lithium battery charging voltage is irregular, injectd user's service standard charger, increased the security in the battery charging process, avoided meeting accident and loss.
The utility model discloses a charging voltage range detects protection circuit is that it gathers the comparison with charging voltage through charging voltage detection circuit, confirms current charging voltage range and carries out charging MOSFET state control according to high-low pressure protection threshold value reference voltage simultaneously, realizes that the charging voltage range of electricity detects and the protection on the whole charging circuit.
The utility model discloses a can be effectively according to the battery adjustment charging voltage scope of difference, it still has the advantage of low cost and low-power consumption simultaneously.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a circuit diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model provides a charging voltage scope detects protection circuit, protection circuit includes electric core package, charging voltage detection circuitry, power control circuit and charging terminal, electric core package is connected with charging voltage detection circuitry and power control circuit respectively, charging voltage detection circuitry and power control circuit all are connected with the charging terminal.
A charging voltage range detection protection circuit is characterized in that a positive voltage end of a battery pack is connected with one end of a power supply control circuit, and the other end of the power supply control circuit is respectively connected with a positive voltage end of a charging terminal and one end of a charging voltage detection circuit;
the other end of the charging voltage detection circuit is connected with the fourth end of the power supply control circuit;
and the negative end of the battery pack is respectively connected with the third end of the charging voltage detection circuit, the third end of the power supply control circuit and the negative end of the charging terminal.
An electrical core package; a plurality of lithium cells are combined in series;
a charging voltage detection circuit; and monitoring and protecting the charging voltage range of the charging voltage through the operational amplifier, and cutting off the charging Mosfet when the charging voltage of the battery exceeds a high-low voltage protection threshold value to realize overvoltage protection of the whole battery.
A power supply control circuit; when the charging voltage is too high or too low, a control signal of the b-charging voltage detection circuit is received, the battery charging power supply control circuit is carried out, the too-high or too-low charging power supply is forbidden to input the a-cell package, and the protection of the charging voltage range of the whole battery is realized.
A charging terminal: the terminal is used as a charging port and also as a discharging port.
The electric core package is formed by connecting electric cores in series, and the anode of the highest node of the electric core package is connected with the output end of the power supply control circuit; the input end of the power supply control circuit is respectively connected with the input end of the charging voltage detection circuit and the positive electrode of the charging terminal; the output end of the charging voltage detection circuit is connected with the control end of the power supply control circuit; when the charging voltage exceeds the high-low voltage protection threshold value, a control signal is output through the control port to carry out loop turn-off control on the power supply control circuit; the negative electrode of the charging terminal is connected with the lowest negative electrode of the battery cell pack and the grounding end of the charging voltage detection circuit.
A charging voltage range detection protection circuit comprises a high voltage detection circuit, a low voltage detection circuit and a power supply voltage stabilizing circuit,
the electric energy enters the high-voltage detection circuit and the low-voltage detection circuit through the power voltage stabilizing circuit, the electric energy enters the power control circuit through the high-voltage detection circuit and the low-voltage detection circuit, and the electric energy enters the battery cell pack through the power control circuit.
A charging voltage range detection protection circuit comprises a resistor R21 and a voltage stabilizing diode DZ1, wherein the positive voltage end of a charging terminal is connected with one end of a resistor R21, the other end of the resistor R21 is respectively connected with one end of a voltage stabilizing diode DZ1 and the input end of a high voltage detection circuit, and the other end of the voltage stabilizing diode DZ1 is grounded.
As shown in fig. 2, the charging voltage detection circuit is composed of two comparison circuits of U1A and U1B, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R21, a diode D1, a diode D2, a zener diode DZ1, and the like, wherein the resistor R13, the resistor R14, the resistor R17, the comparator U1A, the diode D1, and the like form a high voltage detection circuit; a low-voltage detection circuit is formed by a resistor R15, a resistor R16, a resistor R18, a comparator U1B, a diode D2 and the like; the resistor R11 and the resistor R12 divide the charging voltage in series and then form a high-low voltage detection circuit for voltage detection and comparison; the resistor R21 and the voltage stabilizing diode DZ1 are used as a voltage stabilizing protection circuit of the operational amplifier power supply.
A charging voltage range detection protection circuit comprises a resistor R13, a resistor R14, a resistor R17, a comparator U1A and a diode D1; one end of the resistor R13 is connected with a voltage VCC end and one end of a voltage stabilizing diode DZ1, the other end of the resistor R13 is connected with one end of the resistor R14, one end of the resistor R17 and the No. 3 end of the comparator U1A, the other end of the resistor R14 is grounded, the other end of the resistor R17 is connected with one end of the diode D1, the other end of the diode D1 is connected with the No. 1 end of the comparator U1A and the input end of the power supply control circuit, and the No. 4 end of the comparator U1A is grounded.
The working process of the high-voltage detection circuit is as follows: 8V voltage is subjected to series voltage division through R13 and R14, high-voltage protection threshold value reference voltage can be set, and the reference voltage is input to a non-inverting input end of U1A; the charging voltage is subjected to series voltage division through R11 and R12, a charging voltage sampling value VERF _ VOL can be obtained, and the charging voltage sampling value VERF _ VOL is input to the inverting input end of U1A; when the charging voltage is in a normal range, a sampling value VERF _ VOL of the charging voltage is lower than a reference voltage of a high-voltage protection threshold value, so that an OVP (over voltage) of an output end of the operational amplifier U1A is at a high level; when the charging voltage is higher than the high-voltage protection threshold value, the sampling value VERF _ VOL of the charging voltage is higher than the reference voltage of the low-voltage protection threshold value, so that the OVP of the output end of the operational amplifier U1A is at a low level; a charging high-voltage protection threshold value can be set by configuring resistance values of R13 and R14, and when the charging voltage reaches a certain high-voltage value, the OVP outputs a low-level trigger signal; the R17 feedback resistor forms a hysteresis circuit, OVP can be recovered to high level only when the charging voltage is reduced to hysteresis threshold, and the situation that the charging voltage shakes at the threshold point to trigger the switch repeatedly can be avoided.
A charging voltage range detection protection circuit is characterized in that a positive voltage end of a charging terminal is connected with one end of a resistor R11, the other end of a resistor R11 is respectively connected with one end of a resistor R12, a No. 2 end of a comparator U1A, one end of a resistor R18 and a No. 5 end of a comparator U1B, and the other end of the resistor R12 is grounded;
the resistor R11 and the resistor R12 divide the charging voltage in series and then are used as a high-low voltage detection circuit for voltage detection and comparison.
The low-voltage detection circuit comprises a resistor R15, a resistor R16, a resistor R18, a comparator U1B and a diode D2; the other end of resistance R18 is connected with diode D2's one end, diode D2's the other end is connected with comparator U1B's No. 7 end and power control circuit's input respectively, resistance R15's one end is connected with voltage VCC end, resistance R15's the other end is connected with resistance R16's one end and comparator U1A's No. 6 end respectively, resistance R16's the other end is connected with the negative pressure end of charging terminal, simultaneously ground connection.
The working process of the low-voltage detection circuit is as follows: 8V voltage is subjected to series voltage division through R15 and R16, a low-voltage protection threshold value reference voltage can be set, and the low-voltage protection threshold value reference voltage is input to an inverting input end of U1B; the charging voltage is subjected to serial voltage division through R11 and R12, a charging voltage sampling value VERF _ VOL can be obtained, and the charging voltage sampling value VERF _ VOL is input to a non-inverting input end of U1B; when the charging voltage is in a normal range, a sampling value VERF _ VOL of the charging voltage is higher than a reference voltage of a low-voltage protection threshold, so that UVP of an output end of the operational amplifier U1B is at a high level; when the charging voltage is lower than the low-voltage protection threshold value, the sampling value VERF _ VOL of the charging voltage is lower than the reference voltage of the low-voltage protection threshold value, so that the UVP of the output end of the operational amplifier U1B is at a low level; the charging low-voltage protection threshold value can be set by configuring the resistance values of R15 and R16, and when the charging voltage reaches a certain low-voltage value, the UVP outputs a low-level trigger signal; the feedback resistor R18 forms a hysteresis circuit, UVP can be recovered to high level only when the charging voltage rises to hysteresis threshold, and the situation that the charging voltage shakes at the threshold point to trigger the switch repeatedly can be avoided.
A charging voltage range detection protection circuit comprises a field effect transistor Q1, a field effect transistor Q2, a field effect transistor Q3, a resistor R19, a resistor R20, a resistor R22, a voltage stabilizing diode DZ2 and a voltage stabilizing diode DZ 3;
the D end of the field-effect transistor Q3 is respectively connected with the positive voltage end of a charging terminal, one end of a voltage stabilizing diode DZ2 and one end of a resistor R22, the S end of the field-effect transistor Q3 is connected with the positive voltage end of a battery pack, and the other end of the voltage stabilizing diode DZ2 is respectively connected with the other end of the resistor R22, the G end of the field-effect transistor Q3 and the D end of the field-effect transistor Q1;
the G end of the field effect transistor Q1 is respectively connected with the other end of the diode D1, the No. 1 end of the comparator U1A and one end of the resistor R19, and the other end of the resistor R19 is grounded;
the S end of the field-effect tube Q1 is respectively connected with one end of a voltage-stabilizing diode DZ3 and the D end of the field-effect tube Q2, the G end of the field-effect tube Q2 is respectively connected with the other end of a diode D2, the No. 7 end of a comparator U1B and one end of a resistor R20, and the other end of the resistor R20 is respectively connected with the negative voltage end of a charging terminal, the S end of the field-effect tube Q2, the other end of the voltage-stabilizing diode DZ3 and the negative voltage end of the battery cell pack.
As shown in fig. 2, the power supply control circuit is composed of a field effect transistor Q1, a field effect transistor Q2, a field effect transistor Q3, a resistor R19, a resistor R20, a resistor R22, a zener diode DZ2, a zener diode DZ3 and the like, wherein Q3 is a charging loop turn-off Mosfet, R22 is a G-pole pull-up resistor of Q3 and also plays a role of discharging, and DZ2 is a G-pole overvoltage protection function of Q3; two P channels Q1, Q2 are connected in series between a G pole of Q3 and VSS, Q1 and Q2 are respectively high-voltage protection control N-Mosfet and low-voltage protection control N-Mosfet, and Q3 is controlled to be switched on or switched off according to a control signal received from a charging voltage detection circuit; the G pole of Q1 is connected with the high-voltage protection control output end OVP of the high-voltage detection circuit, and the G pole of Q2 is connected with the low-voltage protection control output end UVP of the low-voltage detection circuit; r19 and R20 are G-pole pull-down resistors of Q1 and Q2 respectively, and play a role in discharging; DZ3 is a surge protection voltage stabilizing diode, which restrains the surge voltage when Q1 and Q2 are switched, and prevents the spike damage of MOSFET in the turn-off moment.
When the charging voltage of the battery is normal, both the OVP control signal and the UVP control signal are at a high level, at the moment, Q1 and Q2 are in a conducting state, the G pole of Q3 is pulled down to a low level through Q1 and Q2, Q3 is in a conducting state, and the battery can be charged normally; when the charging voltage of the battery exceeds a high-voltage protection threshold value, the high-voltage detection circuit OVP outputs a low level, at the moment, the G pole of Q1 is at a low level, Q1 is in a cut-off state, a loop between the G pole of Q3 and VSS is disconnected, the G pole of Q3 is pulled up to a high level through R22, Q3 is in a cut-off state, and the whole battery cannot be charged or discharged; when the charging voltage of the battery is lower than a low-voltage protection threshold value, the low-voltage detection circuit UVP outputs a low level, at the moment, the G pole of Q2 is at a low level, Q2 is in a cut-off state, a loop between the G pole of Q3 and VSS is disconnected, the G pole of Q3 is pulled up to a high level through R22, Q3 is in a cut-off state, and the whole battery cannot be charged or discharged; the discharging state of the battery is controlled by controlling a control loop between the Q3 and the VSS through the Q1 and the Q2, and the safety and normal use of the lithium battery are guaranteed.
A charging voltage range detection protection circuit is characterized in that a battery cell pack is formed by connecting a plurality of lithium battery cells in series.
Claims (8)
1. The utility model provides a charging voltage scope detects protection circuit which characterized in that, protection circuit includes electric core package, charging voltage detection circuitry, power control circuit and charging terminal, electric core package is connected with charging voltage detection circuitry and power control circuit respectively, charging voltage detection circuitry and power control circuit all are connected with charging terminal.
2. The charging voltage range detection protection circuit according to claim 1, wherein the positive voltage end of the core pack is connected to one end of a power control circuit, and the other end of the power control circuit is respectively connected to the positive voltage end of the charging terminal and one end of the charging voltage detection circuit;
the other end of the charging voltage detection circuit is connected with the fourth end of the power supply control circuit;
and the negative end of the battery pack is respectively connected with the third end of the charging voltage detection circuit, the third end of the power supply control circuit and the negative end of the charging terminal.
3. The charging voltage range detection protection circuit of claim 1, wherein the charging voltage detection circuit comprises a high voltage detection circuit, a low voltage detection circuit and a power supply voltage stabilizing circuit,
the electric energy enters the high-voltage detection circuit and the low-voltage detection circuit through the power voltage stabilizing circuit, the electric energy enters the power control circuit through the high-voltage detection circuit and the low-voltage detection circuit, and the electric energy enters the battery cell pack through the power control circuit.
4. The charging voltage range detection protection circuit of claim 3, wherein said power supply voltage regulation circuit comprises a resistor R21 and a Zener diode DZ1, wherein the positive voltage terminal of said charging terminal is connected to one terminal of a resistor R21, the other terminal of said resistor R21 is connected to one terminal of a Zener diode DZ1 and the input terminal of the high voltage detection circuit, respectively, and the other terminal of said Zener diode DZ1 is grounded.
5. The charging voltage range detection protection circuit of claim 3, wherein the high voltage detection circuit comprises a resistor R13, a resistor R14, a resistor R17, a comparator U1A and a diode D1; one end of the resistor R13 is connected with a voltage VCC end and one end of a voltage stabilizing diode DZ1, the other end of the resistor R13 is connected with one end of the resistor R14, one end of the resistor R17 and the No. 3 end of the comparator U1A, the other end of the resistor R14 is grounded, the other end of the resistor R17 is connected with one end of the diode D1, the other end of the diode D1 is connected with the No. 1 end of the comparator U1A and the input end of the power supply control circuit, and the No. 4 end of the comparator U1A is grounded.
6. The charging voltage range detection protection circuit according to claim 5, wherein the positive voltage terminal of the charging terminal is connected to one terminal of a resistor R11, the other terminal of the resistor R11 is connected to one terminal of a resistor R12, a No. 2 terminal of a comparator U1A, one terminal of a resistor R18 and a No. 5 terminal of a comparator U1B, the other terminal of the resistor R12 is grounded,
the low-voltage detection circuit comprises a resistor R15, a resistor R16, a resistor R18, a comparator U1B and a diode D2; the other end of resistance R18 is connected with diode D2's one end, diode D2's the other end is connected with comparator U1B's No. 7 end and power control circuit's input respectively, resistance R15's one end is connected with voltage VCC end, resistance R15's the other end is connected with resistance R16's one end and comparator U1A's No. 6 end respectively, resistance R16's the other end is connected with the negative pressure end of charging terminal, simultaneously ground connection.
7. The charging voltage range detection protection circuit according to claim 5 or 6, wherein the charging voltage detection circuit comprises a field effect transistor Q1, a field effect transistor Q2, a field effect transistor Q3, a resistor R19, a resistor R20, a resistor R22, a zener diode DZ2 and a zener diode DZ 3;
the D end of the field-effect transistor Q3 is respectively connected with the positive voltage end of a charging terminal, one end of a voltage stabilizing diode DZ2 and one end of a resistor R22, the S end of the field-effect transistor Q3 is connected with the positive voltage end of a battery pack, and the other end of the voltage stabilizing diode DZ2 is respectively connected with the other end of the resistor R22, the G end of the field-effect transistor Q3 and the D end of the field-effect transistor Q1;
the G end of the field effect transistor Q1 is respectively connected with the other end of the diode D1, the No. 1 end of the comparator U1A and one end of the resistor R19, and the other end of the resistor R19 is grounded;
the S end of the field-effect tube Q1 is respectively connected with one end of a voltage-stabilizing diode DZ3 and the D end of the field-effect tube Q2, the G end of the field-effect tube Q2 is respectively connected with the other end of a diode D2, the No. 7 end of a comparator U1B and one end of a resistor R20, and the other end of the resistor R20 is respectively connected with the negative voltage end of a charging terminal, the S end of the field-effect tube Q2, the other end of the voltage-stabilizing diode DZ3 and the negative voltage end of the battery cell pack.
8. The charging voltage range detection protection circuit according to claim 4, wherein the battery cell pack is composed of a plurality of lithium battery cells connected in series.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123433822.3U CN217115658U (en) | 2021-12-31 | 2021-12-31 | Charging voltage range detection protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123433822.3U CN217115658U (en) | 2021-12-31 | 2021-12-31 | Charging voltage range detection protection circuit |
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| CN217115658U true CN217115658U (en) | 2022-08-02 |
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