CN214013888U - Battery charging management integrated circuit - Google Patents
Battery charging management integrated circuit Download PDFInfo
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- CN214013888U CN214013888U CN202022163001.1U CN202022163001U CN214013888U CN 214013888 U CN214013888 U CN 214013888U CN 202022163001 U CN202022163001 U CN 202022163001U CN 214013888 U CN214013888 U CN 214013888U
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Abstract
The utility model discloses a battery charging management integrated circuit, which comprises a peripheral input end, an output end, a grounding end, an internal MOS transistor, a logic controller and a battery type detection circuit; the battery type detection circuit detects the terminal voltage of the accessed battery and transmits the detected voltage result to the logic controller; the logic controller receives the detected voltage result, judges whether the type of the currently accessed battery is a voltage reduction type lithium battery or not according to the detected voltage result, and sends a control signal to the MOS transistor to control the on and off of the MOS transistor; and the MOS transistor is switched on and then charges the access battery, and the MOS transistor is switched off and then charges the access battery.
Description
Technical Field
The utility model relates to a battery charging management integrated circuit.
Background
The most basic and important requirement of charging the rechargeable battery through a charger or a charging seat is to ensure the personal and property safety of a user. The full charge voltage of a conventional dry battery is usually 1.6V, and the discharge end voltage is 0.9V. The full charge voltage of the cylindrical battery such as nickel-hydrogen, nickel-cadmium and the like is usually 1.4V, the discharge termination voltage is 0.9V, and the maximum voltage of the dry battery and the cylindrical battery such as nickel-hydrogen, nickel-cadmium and the like is 1.6V, so the battery is called as a low-voltage battery. The full charge voltage of a common lithium battery is usually 4.4V, and the discharge end voltage is 2.4V. In order to make the common lithium battery replace the traditional dry battery and the cylindrical battery such as nickel-hydrogen, nickel-cadmium and the like for use, the same standard is used for the shape size and the voltage output as the dry battery and the cylindrical battery such as nickel-hydrogen, nickel-cadmium and the like, so that the common lithium battery is required to be converted into the voltage output which is the same as the voltage output of the dry battery and the cylindrical battery such as nickel-hydrogen, nickel-cadmium and the like by utilizing the synchronous voltage reduction technology on the basis of the common lithium battery, and the voltage output is called as a voltage reduction type lithium battery. For example, chinese patent CN 201174405Y discloses a dual-voltage output cylindrical battery, wherein a voltage conversion circuit board is disposed inside the battery to control the working voltage output of the battery, so that the voltage output of the battery is similar to that of a dry battery and cylindrical batteries such as nickel-hydrogen batteries and nickel-cadmium batteries.
Because the voltage conversion circuit board is arranged in the step-down lithium battery, the charger or the charging seat is adopted to charge the 5V connected voltage, and cylindrical batteries such as dry batteries, nickel-hydrogen batteries, nickel-cadmium batteries and common lithium batteries can not be directly connected with the 5V voltage. This results in that, if a user loads the cylindrical batteries such as dry cell, nickel-hydrogen, nickel-cadmium and ordinary lithium battery in the charger or charging base of the step-down lithium battery under the condition that the external dimensions of the cylindrical batteries such as dry cell, nickel-hydrogen, nickel-cadmium and ordinary lithium battery are the same, the battery charging will be over-voltage, resulting in damage to the battery or charging equipment.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a can adapt to the battery charging management integrated circuit of cylindrical batteries such as step-down lithium cell and dry battery, nickel-hydrogen, nickel cadmium and ordinary lithium cell simultaneously.
A battery charging management integrated circuit, integrated circuit include: peripheral input end, output end, grounding end, and internal MOS transistor, logic controller and battery type detection circuit;
the battery type detection circuit detects the terminal voltage of the accessed battery and transmits the detected voltage result to the logic controller;
the logic controller receives the detected voltage result, judges whether the type of the currently accessed battery is a voltage reduction type lithium battery or not according to the detected voltage result, and sends a control signal to the MOS transistor to control the on and off of the MOS transistor;
and the MOS transistor is switched on and then charges the access battery, and the MOS transistor is switched off and then charges the access battery.
The peripheral output end of the integrated circuit is connected with a battery, the terminal voltage of the connected battery is detected, the detected voltage result is transmitted to the logic controller, and the logic controller judges whether the currently connected battery is a voltage reduction type lithium battery or not according to the result that the peripheral output end of the integrated circuit is connected with the battery, sends a control signal to the MOS transistor, controls the on and off of the MOS transistor, and charges or disconnects the charge of the connected battery. Therefore, the problem that the batteries or charging equipment are damaged due to charging overvoltage of the cylindrical batteries such as the dry battery, the nickel-hydrogen battery, the nickel-cadmium battery and the common lithium battery caused by the fact that the cylindrical batteries such as the dry battery, the nickel-hydrogen battery, the nickel-cadmium battery and the common lithium battery are loaded in the charger or the charging seat of the voltage reduction type lithium battery is avoided.
Drawings
FIG. 1 is a schematic diagram of an internal circuit of a battery charging management IC according to the present invention;
fig. 2 is a circuit diagram of an embodiment of a battery charging management integrated circuit according to the present invention.
Detailed Description
As shown in fig. 1, a battery charge management integrated circuit, the integrated circuit comprising: peripheral input end, output end, grounding end, and internal MOS transistor, logic controller and battery type detection circuit;
the battery type detection circuit detects the terminal voltage of the accessed battery and transmits the detected voltage result to the logic controller;
the logic controller receives the detected voltage result, judges whether the type of the currently accessed battery is a voltage reduction type lithium battery or not according to the detected voltage result, and sends a control signal to the MOS transistor to control the on and off of the MOS transistor;
and the MOS transistor is switched on and then charges the access battery, and the MOS transistor is switched off and then charges the access battery.
The peripheral output end of the integrated circuit is connected with a battery, the terminal voltage of the connected battery is detected, the detected voltage result is transmitted to the logic controller, and the logic controller judges whether the currently connected battery is a voltage reduction type lithium battery or not according to the result that the peripheral output end of the integrated circuit is connected with the battery, sends a control signal to the MOS transistor, controls the on and off of the MOS transistor, and charges or disconnects the charge of the connected battery. Therefore, the problem that the batteries or charging equipment are damaged due to charging overvoltage of the cylindrical batteries such as the dry battery, the nickel-hydrogen battery, the nickel-cadmium battery and the common lithium battery caused by the fact that the cylindrical batteries such as the dry battery, the nickel-hydrogen battery, the nickel-cadmium battery and the common lithium battery are loaded in the charger or the charging seat of the voltage reduction type lithium battery is avoided.
As shown in fig. 2, the MOS transistor Q1 is a P-type MOS transistor, the gate of the P-type MOS transistor is electrically connected to the logic controller, the source of the P-type MOS transistor is electrically connected to the access battery, and the drain of the P-type MOS transistor is electrically connected to the peripheral input terminal of the integrated circuit.
Taking a single battery as an example, the battery type detection circuit is a battery type detection comparator circuit 1, a voltage sampling end of the battery type detection comparator circuit 1 is electrically connected with an accessed battery, a reference voltage threshold value of a reference voltage input end of the battery type detection comparator circuit is set to be 4.4V, and an output end of the battery type voltage detection comparator circuit 1 is electrically connected with the logic controller.
The integrated circuit also internally includes a low-voltage battery voltage detection comparator circuit 2, a battery precharge voltage detection comparator circuit 3, a data selector (MUX) 6, a current detection comparator circuit 4, and a temperature detection comparator circuit 5.
The reference voltage threshold value of the reference voltage input end of the low-voltage battery detection comparator circuit 2 is set to be 2.4V; the reference voltage threshold value of the reference voltage input end of the battery pre-charge detection comparator circuit 3 is set to be 1V; the reference current threshold value of the reference current input terminal of the current detection comparator circuit 4 is set to 1.5A, and the reference temperature threshold value of the reference temperature input terminal of the temperature detection comparator circuit 5 is set to 130 degrees celsius.
When the peripheral output end OUT of the integrated circuit is connected with a single battery, the battery type voltage detection comparator circuit 1 detects the terminal voltage of the connected battery, and at the moment, when the terminal voltage of the instantly electrified connected single battery is detected to be larger than the reference voltage threshold value 4.4V of the reference voltage input end, the logic controller controls the P-type MOS transistor to charge the battery connected with the single battery, namely the voltage reduction type lithium battery, through the data selector (MUX) 6. When the battery type detection comparator circuit 1 detects that the terminal voltage accessed to the single battery is smaller than the reference voltage threshold value of the reference voltage input end of the single battery by 4.4V, the logic controller controls the P-type MOS transistor to be another battery for accessing the single battery through the data selector (MUX) 6. The charging device avoids the damage of the battery or the charging equipment caused by the charging overvoltage of the cylindrical batteries such as the dry battery, the nickel-hydrogen battery, the nickel-cadmium battery and the common lithium battery when the cylindrical batteries such as the dry battery, the nickel-hydrogen battery, the nickel-cadmium battery and the common lithium battery are loaded in the charger or the charging seat of the voltage reduction type lithium battery.
When the peripheral output end OUT of the integrated circuit is connected with a single battery, and the peripheral output end of the integrated circuit is connected with the battery and is electrified instantly, the low-voltage battery detection comparator circuit 2 detects that the terminal voltage of the connected single battery is smaller than the reference voltage threshold value 2.4V of the reference voltage input end of the single battery, and the logic controller controls the P-type MOS transistor to be connected with the single battery as the low-voltage battery through the data selector (MUX) 6. When the low-voltage battery detection comparator circuit 2 detects that the terminal voltage of the accessed single battery is greater than the reference voltage threshold value of the reference voltage input end of the single battery by 2.4V, the logic controller controls the P-type MOS transistor to enable the accessed single battery to be a common lithium battery or a step-down lithium battery through the data selector (MUX) 6. Therefore, the problem that the batteries or charging equipment are damaged due to charging overvoltage of the cylindrical batteries such as the dry battery, the nickel-hydrogen battery, the nickel-cadmium battery and the common lithium battery caused by the fact that the cylindrical batteries such as the dry battery, the nickel-hydrogen battery, the nickel-cadmium battery and the common lithium battery are loaded in the charger or the charging seat of the voltage reduction type lithium battery is avoided.
When the peripheral output end OUT of the integrated circuit is connected with a single battery, and the battery pre-charging detection comparator circuit 3 detects that the terminal voltage connected with the single battery is smaller than the reference voltage threshold value 1V of the reference voltage input end of the single battery, the battery is discharged too much, and the battery needs to be pre-charged with small current, the logic controller controls the P-type MOS transistor through the data selector (MUX) 6, and the pre-charged current is set at 100mA, so that the situation that the connected battery is charged with large current at first and the battery is damaged is avoided.
When the peripheral output end OUT of the integrated circuit is connected with a single battery, and the current detection comparator circuit 4 detects that the current connected with the single battery is larger than the reference current threshold value 1.5A of the reference current input end of the single battery, the logic controller controls the P-type MOS transistor to disconnect and charge the connected single battery through the data selector (MUX) 6, and the damage to the rechargeable battery and the charging equipment caused by the overcurrent of the charging current is prevented.
When the peripheral output end OUT of the integrated circuit is connected with a single battery, and the temperature detection comparator circuit 5 detects that the temperature of the connected single battery and the temperature of the circuit are higher than the reference temperature threshold value of the reference temperature input end of the circuit by 130 ℃, the logic controller controls the P-type MOS transistor to disconnect and charge the connected single battery through the data selector (MUX) 6, so that the serious consequences such as fire or explosion caused by heating and burning of the battery or the circuit, which endanger the safety of lives and properties, are prevented.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (7)
1. A battery charge management integrated circuit, the integrated circuit comprising: peripheral input end, output end, grounding end, and internal MOS transistor, logic controller and battery type detection circuit;
the battery type detection circuit detects the terminal voltage of the accessed battery and transmits the detected voltage result to the logic controller;
the logic controller receives the detected voltage result, judges whether the type of the currently accessed battery is a voltage reduction type lithium battery or not according to the detected voltage result, and sends a control signal to the MOS transistor to control the on and off of the MOS transistor;
and the MOS transistor is switched on and then charges the access battery, and the MOS transistor is switched off and then charges the access battery.
2. The battery charging management integrated circuit of claim 1, wherein the battery type detection circuit is a battery type detection comparator circuit, a voltage sampling terminal of the battery type detection comparator is electrically connected to the accessed battery, a reference voltage threshold for distinguishing the buck-type lithium battery is set at a reference voltage input terminal of the battery type detection comparator circuit, and an output terminal of the battery type detection comparator circuit is electrically connected to the logic controller.
3. The battery charge management integrated circuit of claim 1, wherein the MOS transistor is a P-type MOS transistor, a gate of the P-type MOS transistor is electrically connected to the logic controller, a source of the P-type MOS transistor is electrically connected to the access battery, and a drain of the P-type MOS transistor is electrically connected to the peripheral input of the integrated circuit.
4. The integrated circuit for battery charge management according to claim 1, further comprising a low voltage battery detection circuit and a data selector;
the low-voltage battery detection circuit is composed of a low-voltage battery detection comparator circuit, the voltage sampling end of the low-voltage battery detection comparator circuit is electrically connected with the accessed battery, the reference voltage input end of the low-voltage battery detection comparator circuit is provided with a reference voltage threshold value for distinguishing the low-voltage battery, the output end of the low-voltage battery detection comparator circuit is electrically connected with the logic controller,
and the data selector is used for switching the control signal sent by the logic controller and electrically connecting the control signal to control the on and off of the MOS transistor.
5. The battery charging management integrated circuit according to claim 4, further comprising a current detection circuit inside the integrated circuit, wherein the current detection circuit is a current detection comparator circuit, a current sampling terminal of the current detection comparator circuit is electrically connected to the accessed battery, a reference current threshold value for preventing overcurrent during charging of the accessed battery is set at a reference current input terminal of the current detection comparator circuit, and an output terminal of the current detection comparator circuit is electrically connected to the logic controller.
6. The battery charging management integrated circuit of claim 4, further comprising a temperature detection circuit inside the integrated circuit, wherein the temperature detection circuit is a temperature detection comparator circuit, a temperature sampling end of the temperature detection comparator circuit is used for collecting the current circuit temperature and the temperature of the battery, and a reference temperature input end of the temperature detection comparator circuit is provided with a reference temperature threshold for preventing the circuit from passing the battery.
7. The battery charging management integrated circuit according to claim 4, further comprising a battery pre-charge detection circuit inside the integrated circuit, wherein the battery pre-charge detection circuit is a battery pre-charge detection comparator circuit, a voltage sampling terminal of the battery pre-charge detection comparator circuit is electrically connected to the accessed battery, a reference voltage threshold value for excessive battery discharge is set at a reference voltage input terminal of the battery pre-charge detection comparator circuit, and an output terminal of the battery pre-charge detection comparator is electrically connected to the logic controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022163001.1U CN214013888U (en) | 2020-09-28 | 2020-09-28 | Battery charging management integrated circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022163001.1U CN214013888U (en) | 2020-09-28 | 2020-09-28 | Battery charging management integrated circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214013888U true CN214013888U (en) | 2021-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022163001.1U Active CN214013888U (en) | 2020-09-28 | 2020-09-28 | Battery charging management integrated circuit |
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| CN (1) | CN214013888U (en) |
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- 2020-09-28 CN CN202022163001.1U patent/CN214013888U/en active Active
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