CN213185542U - Protection circuit of mobile power supply and mobile power supply - Google Patents
Protection circuit of mobile power supply and mobile power supply Download PDFInfo
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- CN213185542U CN213185542U CN202021231350.6U CN202021231350U CN213185542U CN 213185542 U CN213185542 U CN 213185542U CN 202021231350 U CN202021231350 U CN 202021231350U CN 213185542 U CN213185542 U CN 213185542U
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Abstract
The utility model is suitable for an electronic circuit technical field provides a protection circuit and portable power source of portable power source, including battery unit, battery protection unit, battery charge-discharge management unit the battery protection unit with the battery unit is connected, the battery protection unit is to the overcharge of battery unit and discharge and the protection of overdischarging; the battery charging and discharging management unit is connected with the battery protection unit and used for converting the charging voltage and the discharging voltage of the battery unit and managing the electric quantity information of the battery unit. To prevent problems of overcharge or overdischarge.
Description
Technical Field
The utility model belongs to the technical field of the electronic circuit, especially, relate to a portable power source's protection circuit and portable power source.
Background
Along with the increase of display screens of portable electronic equipment such as mobile phones, digital cameras, palm computers and the like, the power consumption of the portable electronic equipment also increases, and the portable power supply is produced in order to meet the requirement of people on the power.
Most of the mobile power sources commonly used in the prior art adopt a lithium ion battery as a power source to realize power supply, however, the lithium ion battery has a relatively strict requirement on charging equipment, and in order to realize automatic charging, situations such as overcurrent and overvoltage during charging need to be effectively concerned, so that the mobile power sources or the charging equipment are damaged.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a portable power source's protection circuit and portable power source aims at preventing that portable power source from taking place the condition such as overcurrent, excessive pressure in the charging process.
The embodiment of the utility model provides a realize like this, a portable power source's protection circuit includes: the battery unit, the battery protection unit and the battery charge-discharge management unit;
the battery protection unit is connected with the battery unit and is used for carrying out overcharge and over-discharge protection on the charge and discharge of the battery unit;
the battery charging and discharging management unit is connected with the battery protection unit and used for converting the charging voltage and the discharging voltage of the battery unit and managing the electric quantity information of the battery unit.
Still further, still include: the voltage detection unit and the data processing and communication unit;
the voltage detection unit is connected with the battery unit and is used for detecting the voltage of the battery unit;
and the data processing and communication unit is connected with the voltage detection unit and is used for converting the voltage detected by the voltage detection unit into the electric quantity information of the battery unit.
Still further, the battery protection unit includes: the protection circuit comprises a protection chip, a first resistor, a first capacitor, a second capacitor and an external interface;
a 5 th pin, a 7 th pin, an 8 th pin and a 9 th pin of the protection chip are connected with the negative electrode of the battery unit, a 6 th pin of the protection chip is connected with one end of the first resistor, the other end of the first resistor is connected with the positive electrode of the battery unit, one end of the first capacitor is connected between the first resistor and the 6 th pin of the protection chip, the other end of the first capacitor is connected with the negative electrode of the battery unit, one end of the second capacitor is connected with the negative electrode of the battery unit, and the other end of the second capacitor is grounded; the external interface is connected with the positive electrode of the battery unit; and the No. 2 pin, the No. 3 pin and the No. 4 pin of the protection chip are all grounded.
Further, the protection chip is an IP3005 chip.
Further, the battery charge and discharge management unit includes: the charging management circuit comprises a charging management chip, a first diode, a second resistor, a third capacitor, a fourth capacitor, a first indicator light, a second indicator light, a third indicator light, a fourth indicator light, an inductor, a third resistor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor and a tenth capacitor; wherein the content of the first and second substances,
the No. 1 pin of the charging management chip is connected with a power supply, the cathode of the first diode is connected with the power supply, the cathode of the first diode is grounded, one end of the second resistor is connected with the No. 1 pin of the charging management chip, the other end of the second resistor is connected with one end of the third capacitor, and the other end of the third capacitor is grounded; one end of the fourth capacitor is connected with a No. 1 pin of the charging management chip, and the other end of the fourth capacitor is grounded; the positive pole of the first indicator light is connected with the 2 nd pin of the charging management chip, the negative pole of the first indicator light is connected with the 4 th pin of the charging management chip, the positive pole of the second indicator light is connected with the 4 th pin of the charging management chip, the negative pole of the second indicator light is connected with the 2 nd pin of the charging management chip, the positive pole of the third indicator light is connected with the 3 rd pin of the charging management chip, the negative pole of the third indicator light is connected with the 4 th pin of the charging management chip, the positive pole of the fourth indicator light is connected with the 4 th pin of the charging management chip, the negative pole of the fourth indicator light is connected with the 3 rd pin of the charging management chip, the 9 th pin of the charging management chip is grounded, and the 6 th pin of the charging management chip is connected with one end of a fifth capacitor, the other end of the fifth capacitor is grounded, a 7 th pin of the charging management chip is connected with one end of the inductor, the other end of the inductor is connected with one end of a third resistor, the other end of the third resistor is connected with a 6 th pin of the charging management chip, the sixth capacitor and the seventh capacitor are connected in parallel, one end of each capacitor is connected with the other end of the inductor, and the other end of each capacitor is grounded; the eighth capacitor, the ninth capacitor and the tenth capacitor are connected in parallel, one end of each capacitor is connected with the 8 th pin of the charging management chip, and the other end of each capacitor is grounded;
the other end of the inductor is connected with the battery protection unit.
Further, the charging management chip is an IP5306 chip.
Still further, the data processing and communication unit comprises: the voltage processing chip, the second diode, the fourth resistor, the eleventh capacitor, the twelfth capacitor, the thirteenth capacitor, the crystal oscillator, the fourteenth capacitor, the third diode and the fifteenth capacitor;
the 2 nd pin of the voltage processing chip is connected with an upper computer, the cathode of the second diode is connected with the 2 nd pin of the voltage processing chip, and the anode of the second diode is grounded; one end of the fourth resistor is connected with a power supply, the other end of the fourth resistor is connected with one end of an eleventh capacitor, the other end of the eleventh capacitor is grounded, and a 4 th pin of the voltage processing chip is connected between the fourth resistor and the eleventh capacitor; a 5 th pin of the voltage processing chip is connected with one end of a twelfth capacitor, the other end of the twelfth capacitor is grounded, a 6 th pin of the voltage processing chip is connected with one end of a thirteenth capacitor, the other end of the thirteenth capacitor is grounded, one end of the crystal oscillator is connected between the twelfth capacitor and the 5 th pin, and the other end of the crystal oscillator is connected between the thirteenth capacitor and the 6 th pin; a 7 th pin of the voltage processing chip is grounded, an 8 th pin of the voltage processing chip is connected with one end of the fourteenth capacitor, the other end of the fourteenth capacitor is grounded, a 9 th pin of the voltage processing chip is connected with one end of the fifteenth capacitor and a cathode of the third diode, and the other end of the fifteenth capacitor and an anode of the third diode are grounded.
Still further, the voltage detection unit includes: the voltage processing chip; and the 14 th pin of the voltage processing chip is connected with the battery unit.
Further, the voltage processing chip was an STM8S003F3 chip.
The embodiment of the utility model provides a still provide a portable power source, including above-mentioned embodiment portable power source's protection circuit.
Compared with the prior art, the utility model provides a pair of portable power source's protection circuit has following beneficial effect: the method comprises the following steps: the battery unit, the battery protection unit and the battery charge-discharge management unit; the battery protection unit is connected with the battery unit and used for carrying out overcharge and over-discharge protection on the charge and discharge of the battery unit; the battery charging and discharging management unit is connected with the battery protection unit and used for converting the charging voltage and the discharging voltage of the battery unit and managing the electric quantity information of the battery unit. In this way, the battery protection unit detects the charging voltage and the charging current, and the discharging voltage and the discharging current of the battery unit, thereby preventing the occurrence of the problem of overcharge or overdischarge and protecting the battery unit. The battery charge-discharge management unit converts external voltage into charging voltage of the battery unit, converts discharging voltage of the battery unit into voltage required by a device to be charged, ensures charge-discharge function of the battery unit, and can prevent the mobile power supply from overcurrent, overvoltage and the like in the charging process by applying the protection circuit to the mobile power supply so as to protect the battery in the mobile power supply.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a protection circuit of a mobile power supply according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a protection circuit of another mobile power supply according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a protection circuit of a mobile power supply according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a protection chip according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to effectively explain the embodiments of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the present application provides a protection circuit of a mobile power supply, including: the battery unit 10, the battery protection unit 20, and the battery charge/discharge management unit 30. The battery protection unit 20 is connected to the battery unit 10, and the battery protection unit 20 performs overcharge and over-discharge protection on charge and discharge of the battery unit 10; the battery charge and discharge management unit 30 is connected to the battery protection unit 20, and the battery charge and discharge management unit 30 is configured to convert a charge voltage and a discharge voltage of the battery unit 10 and manage power information of the battery unit 10.
Specifically, the battery unit 10 is connected to the battery protection unit 20, and when the battery unit 10 is charged, the battery protection unit 20 performs overcharge voltage detection on the battery unit 10, that is, the overcharge current detection is performed to monitor the voltage and current charged to the battery unit 10 in real time, so as to prevent the battery unit 10 from being damaged due to overcharge. When the battery unit 10 discharges, the battery protection unit 20 performs over-discharge voltage and over-discharge current detection on the battery unit 10, that is, real-time monitoring on the voltage and current discharged from the battery unit 10, so as to prevent the battery unit 10 from being lost due to over-discharge, and further provide overvoltage and overcurrent protection for the battery unit 10.
The battery charge/discharge management unit 30 is connected to the battery protection unit 20, and the battery charge/discharge management unit 30 is a step-up/step-down converter of the battery unit 10. When the battery unit 10 is charged, because the maximum charging voltage of the battery unit 10 is different from the voltage received at the charging interface of the battery unit 10, the battery charging and discharging management unit 30 needs to perform voltage reduction processing on the voltage received at the charging interface of the battery unit 10, convert the voltage into the maximum charging voltage of the battery unit 10, and charge the battery unit 10. When the battery unit 10 discharges, since the maximum discharge voltage of the battery unit 10 is different from the voltage at the discharge interface of the battery unit 10, the battery charge and discharge management unit 30 needs to boost the discharge voltage of the battery unit 10 and convert the boost voltage into the voltage at the discharge interface of the battery unit 10. Through the above-described procedure, the battery charge and discharge management unit 30 performs charge and discharge management on the battery cell 10. The battery charge and discharge management unit 30 manages the power amount information of the battery unit 10.
The battery unit 10 may be a lithium battery.
As shown in fig. 2, the protection circuit of the mobile power supply further includes: a voltage detection unit 40 and a data processing and communication unit 50.
The voltage detection unit 40 is connected to the battery unit 10 and detects the voltage of the battery unit 10.
The data processing and communication unit 50 is connected to the voltage detection unit 40, and is configured to convert the voltage detected by the voltage detection unit 40 into the power information of the battery unit 10.
Specifically, the voltage detection unit 40 is connected to the battery unit 10, and may monitor the charging voltage of the battery unit 10 in real time. The data processing and communication unit 50 is connected to the voltage detection unit 40, the voltage detection unit 40 transmits the detected charging voltage of the battery unit 10 to the data processing and communication unit 50, and the data processing and communication unit 50 may convert the charging voltage into battery level information of the battery unit 10 and report the battery level information to a previous device.
Further, as shown in fig. 3, the battery protection unit 20 includes: the protection circuit comprises a protection chip U1, a first resistor R1, a first capacitor C4, a second capacitor C8 and an external interface P.
A 5 th pin, a 7 th pin, an 8 th pin and a 9 th pin of a protection chip U1 are connected with the cathode of the battery unit 10, a 6 th pin of the protection chip U1 is connected with one end of the first resistor R1, the other end of the first resistor R1 is connected with the anode of the battery unit 10, one end of the first capacitor C4 is connected between the first resistor R1 and the 6 th pin of the protection chip U1, the other end of the first capacitor C4 is connected with the cathode of the battery unit 10, one end of the second capacitor C8 is connected with the cathode of the battery unit 10, and the other end of the second capacitor C8 is grounded; the external interface P is connected to the positive electrode of the battery unit 10; the No. 2 pin, the No. 3 pin and the No. 4 pin of the protection chip U1 are all grounded.
As shown in fig. 4, in this embodiment, the protection chip U1 incorporates a power MOSFET, and the 1 st pin of the protection chip U1 is an NC pin and floats. The 2 nd, 3 rd and 4 th pins of the protection chip U1 are VM pins, are used as the negative electrodes of a charger or a load, and are connected with a power MOSFET inside the chip. The 5 th and 7 th pins of the protection chip U1 are GND pins for connecting the cathode of the battery unit 10 and are connected with the power MOSFET inside the chip. The 6 th pin of the protection chip U1 is a VDD pin for connecting the positive electrode of the battery cell 10. The 8 th pin of the protection chip U1 is an ISET pin, is used for being connected with GND of an external resistor, can be used for adjusting overcharge/overdischarge current, and can also be directly short-circuited to GND. The 9 th pin of the protection chip U1 is a PAD pin for current running and needs to be connected to GND.
GND is a ground line.
When the protection chip U1 detects the charging overvoltage of the battery unit 10, when the protection chip U1 detects that the battery voltage VDD of the battery unit 10 is greater than the maximum charging voltage VCU of the battery unit 10, and the time when the battery voltage VDD of the battery unit 10 is greater than the maximum charging voltage VCU of the battery unit 10 exceeds a first preset time, it is determined that the battery unit is in the charging overvoltage state. The protection chip U1 controls the internal charging logic to turn off the internal power MOSFET and stop charging the battery cell 10. The charging overvoltage condition will be released when the following two conditions occur:
(1) when the voltage of the battery cell 10 drops to the overcharge recovery voltage VCL when the charger is connected, the protection chip U1 will turn on the internal power MOSFET to return to normal operation.
(2) When the charger is disconnected and the load is connected to the two ends of the battery unit 10 to start discharging, the protection chip U1 turns on the internal power MOSFET to return to a normal working state.
The specific implementation mode is as follows: when a load is connected across the battery cell 10, the battery cell 10 begins to discharge and current is discharged through the internal parasitic diode of the internal power MOSFET, at which point the VM voltage immediately rises from 0V to around 0.7V (diode turn-on voltage), and the protection chip U1 detects the VM voltage and releases the overcharge state. When the battery voltage VDD of the battery cell 10 is not greater than the maximum charging voltage VCU of the battery cell 10, the protection chip U1 is restored to the normal state, otherwise it is not. In addition, if the VM voltage is too small when the load across the battery cell 10 starts discharging, the discharge detection cannot be triggered, and the circuit does not recover to the normal state.
When the battery voltage VDD of the battery cell 10 is greater than the maximum charging voltage VCU of the battery cell 10, even if a load is connected to cause discharge overcurrent, the discharge overcurrent protection is not enabled until the battery voltage VDD drops to VCU. Due to the internal resistance of the battery unit 10, at the moment when the discharging overcurrent load is switched on, the battery voltage will drop, and if the battery voltage drops below VCU, the discharging overcurrent protection will be triggered. If the load is short-circuited, the battery voltage will drop below VCU instantaneously, and the short-circuit protection state is entered.
It should be noted that the first preset time is preset, and the application is not limited to this. .
When the protection chip U1 performs discharge under-voltage detection on the battery unit 10, when the protection chip U1 detects that the battery voltage VDD of the battery unit 10 is smaller than the maximum discharge voltage VDL of the battery unit 10, and the time when the battery voltage VDD of the battery unit 10 is smaller than the maximum discharge voltage VDL of the battery unit 10 exceeds a second preset time, it is determined that the battery unit is in a discharge under-voltage state. The protection chip U1 controls the internal discharge logic to turn off the internal power MOSFET, so that the battery cell 10 stops discharging.
When the internal power MOSFET is turned off, the pull-up resistor RVMD between the internal VM and GND of the protection chip U1 will raise the voltage of VM.
When VM >1.5V, IVDD < IPDN, the protection chip U1 enters an OFF sleep state. Under the conditions of undervoltage discharge and shutdown sleep, VM is connected with VDD through a resistor RVMD. When the charger is turned on and the voltage difference between VM and VDD is greater than or equal to 1.3V, the off sleep state is released, but the internal power MOSFET is still turned off, and the protection chip U1 will resume normal operation only when the battery cell 10 voltage returns to VDL or greater.
When the charger is connected to the battery unit 10 in the discharging undervoltage state, if the VM pin voltage is not less than the charging detection voltage VCHA, the discharging undervoltage state is also released when the battery voltage of the battery unit 10 is greater than or equal to the overdischarging recovery voltage VDR, and the protection chip U1 recovers to the normal operating state.
It should be noted that the second preset time is preset, and the application is not limited to this. .
When the protection chip U1 performs discharge overcurrent detection on the battery cell 10, in the normal discharge process, if the discharge current exceeds the discharge overcurrent threshold IIOV, and the time that the discharge current exceeds the discharge overcurrent threshold IIOV is longer than a third preset time, the protection chip U1 controls the discharge logic, turns off the internal power MOSFET, stops discharging, and enters a discharge overcurrent state.
When discharging and overflowing, VM and GND are short-circuited through an internal resistor RVMS. When the load is connected, the VM voltage is approximately equal to the VDD voltage, and when the impedance between the VM and the VDD is increased, so that the VM voltage is reduced to be close to GND, the discharge overcurrent state is released. When the load is disconnected, since the VM and the GND are shorted by the resistor RVMS, the voltage of the VM is directly reduced to the GND, the discharging overcurrent state is released, and the protection chip U1 is restored to the normal working state.
It should be noted that the third preset time is preset, and the application is not limited to this.
When the protection chip U1 performs charging overcurrent detection on the battery cell 10, when the charging current exceeds the charging overcurrent threshold IIOC and the time that the charging current exceeds the charging overcurrent threshold IIOC is longer than the fourth preset time, the protection chip U1 controls the charging logic to turn off the internal power MOSFET, stop charging, and enter a charging overcurrent state.
The charging overcurrent detection is started only when the VM is less than or equal to the VCHA, and the protection chip U1 judges that the charging state is entered. When the battery is in over-discharge under-voltage, if over-current flows in, the power MOSFET can be closed to stop charging only when the battery voltage returns to over-discharge voltage VDL.
When the charger is disconnected, the charging overcurrent state is released when VM is greater than or equal to VCHA. In addition, the 0V-battery charging function is prioritized over the over-current detection, and the charging over-current protection does not work when the battery voltage is low.
It should be noted that the fourth preset time is preset, and the application is not limited to this.
Further, the first capacitor C4 and the first resistor R1 form a power filter for suppressing power supply ripples, and the first capacitor C4 needs to be close to the VDD pin to enhance the filtering effect. Optionally, the value of the first capacitance C4 is 4.7 μ F.
The resistance of the first resistor R1 is not easy to be too large, when the charging or discharging is greater than 1A, the current monitoring function is turned on inside the protection chip U1, along with the increase of the charging or discharging current, the current of the VDD pin of the protection chip U1 is also increased correspondingly, and the too large resistance of the first resistor R1 causes an excessive voltage drop, so that the actual voltage of the VDD pin of the protection chip U1 is lower than the voltage of the battery unit 10.
Optionally, the first resistor R1 has a resistance of 100 ohms.
The second capacitor C8 in the circuit is used to always protect the peak voltage of the VM port in the chip U1, and avoid the excessive VM voltage jitter caused by the transient change of large current, which may damage the protection chip U1. Optionally, the value of the second capacitance C8 is 2.2 μ F.
Further, the protection chip U1 is an IP3005 chip.
In the present embodiment, referring to fig. 3, the battery charge/discharge management unit 30 includes: the charging management circuit comprises a charging management chip U2, a first diode D1, a second resistor R2, a third capacitor C7, a fourth capacitor C6, a first indicator lamp D2, a second indicator lamp D4, a third indicator lamp D3, a fourth indicator lamp D5, an inductor L1, a third resistor R3, a fifth capacitor C9, a sixth capacitor C5, a seventh capacitor C20, an eighth capacitor C1, a ninth capacitor C2 and a tenth capacitor C3; wherein the content of the first and second substances,
the 1 st pin of the charging management chip U2 is connected with a power supply, the cathode of the first diode D1 is connected with the power supply, the cathode of the first diode D1 is grounded, one end of the second resistor R2 is connected with the 1 st pin of the charging management chip U2, the other end of the second resistor R2 is connected with one end of the third capacitor C7, and the other end of the third capacitor C7 is grounded; one end of the fourth capacitor C6 is connected with the 1 st pin of the charging management chip U2, and the other end of the fourth capacitor C6 is grounded; the anode of the first indicator light D2 is connected to the 2 nd pin of the charging management chip U2, the cathode of the first indicator light D2 is connected to the 4 th pin of the charging management chip U2, the anode of the second indicator light D4 is connected to the 4 th pin of the charging management chip U2, the cathode of the second indicator light D4 is connected to the 2 nd pin of the charging management chip U2, the anode of the third indicator light D3 is connected to the 3 rd pin of the charging management chip U2, the cathode of the third indicator light D3 is connected to the 4 th pin of the charging management chip U2, the anode of the fourth indicator light D5 is connected to the 4 th pin of the charging management chip U2, the cathode of the fourth indicator light D5 is connected to the 3 rd pin of the charging management chip U2, the 9 th pin of the charging management chip U2 is grounded, and the anode of the charging management chip D2 is connected to the fifth terminal U9, the other end of the fifth capacitor C9 is grounded, the 7 th pin of the charging management chip U2 is connected to one end of the inductor L1, the other end of the inductor L1 is connected to one end of a third resistor R3, the other end of the third resistor R3 is connected to the 6 th pin of the charging management chip U2, the sixth capacitor C5 and the seventh capacitor C20 are connected in parallel, one end of each of the sixth capacitor C5 and the seventh capacitor C20 is connected to the other end of the inductor L1, and the other end of each of the sixth capacitor C5 and the seventh capacitor C20 is grounded; the eighth capacitor C1, the ninth capacitor C2 and the tenth capacitor C3 are connected in parallel, one end of each capacitor is connected with the 8 th pin of the charging management chip U2, and the other end of each capacitor is grounded;
the other end of the inductor L1 is connected to the battery protection unit 10.
Specifically, the 1 st pin of the charging management chip U2 is the VIN pin, which is the 5V charging input pin. The 2 nd pin of the charging management chip U2 is the LED1 pin, which is the LED driving pin. The 3 rd pin of the charging management chip U2 is an LED2 pin, which is an LED driving pin. The 4 th pin of the charging management chip U2 is an LED3 pin, which is an LED driving pin. The 5 th pin of the charging management chip U2 is a KEY pin, which is a KEY input pin, and the driving of the illuminating lamp is multiplexed. The 6 th pin of the charging management chip U2 is a BAT pin, is a boosting input pin and is connected with the anode of the lithium battery. The 7 th pin of the charge management chip U2 is the SW pin, which is the DC-DC switch pin. The 8 th pin of the charge management chip U2 is the VOUT pin, which is the 5V boost output pin. The 9 th pin of the charging management chip U2 is a PowerPAD pin for grounding.
Further, the 6 th pin of the charging management chip U2 is connected to the external interface P in the battery protection unit 20.
It should be noted that the charging interface voltage of the portable power source is generally 5V, and when the battery unit 10 is a lithium battery, the maximum charging voltage of a single lithium battery is 4.2V, and the lithium battery needs to be subjected to voltage reduction processing. Similarly, the output interface voltage of the mobile power supply generally requires 5V, the maximum amplification voltage of the lithium battery is also 4.2V, and the lithium battery needs to be boosted. Therefore, the lithium battery is sensitive to the battery voltage and the charging current, and the charging management of the lithium battery is realized and the lithium battery is protected by converting the charging voltage and the discharging voltage of the lithium battery through the charging management chip U2.
The charging management chip U2 realizes the voltage boosting and voltage dropping functions through an inductor L1. Meanwhile, the charging management chip U2 can drive 4 LED lamps for indicating the power information.
Further, the charge management chip U2 is an IP5306 chip. The IP5306 chip is a multifunctional battery management chip integrating a boost converter, lithium battery charging management and battery power indication, and provides a complete power supply solution for the mobile power supply. The high integration and rich functions of the device enable the device to be applied with only few peripheral devices, effectively reduce the size of the whole scheme and reduce the cost.
Furthermore, the second resistor R2 and the third capacitor C7 form a power filter for suppressing power ripples, and the fourth capacitor C6 is close to the VDD pin to enhance the filtering effect. The first diode D1 is used for over-voltage protection of the first indicator light D2, the second indicator light D4, the third indicator light D3 and the fourth indicator light D5 for indicating the amount of charge of the battery. The inductor L1 is used for controlling the voltage boosting and voltage reducing functions of the charging management chip U2. And a fifth capacitor C9 is used to form a filter with the third resistor R3. The sixth capacitor C5, the seventh capacitor C20, the eighth capacitor C1, the ninth capacitor C2 and the tenth capacitor C3 all play a role in filtering.
In this way, the battery charge/discharge management unit 30 can manage the charging of the battery cell 10 and protect the charging/discharging of the battery cell.
Further, as shown in fig. 3, the data processing and communication unit 50 includes: the voltage processing chip U3, the second diode D6, the fourth resistor R4, the eleventh capacitor C10, the twelfth capacitor C11, the thirteenth capacitor C13, the crystal oscillator Y1, the fourteenth capacitor C12, the third diode D7 and the fifteenth capacitor C14;
the 2 nd pin of the voltage processing chip U3 is connected with an upper computer, the cathode of the second diode D6 is connected with the 2 nd pin of the voltage processing chip U3, and the anode is grounded; one end of the fourth resistor R4 is connected with a power supply, the other end of the fourth resistor R4 is connected with one end of an eleventh capacitor C10, the other end of the eleventh capacitor C10 is grounded, and a 4 th pin of the voltage processing chip U3 is connected between the fourth resistor R4 and the eleventh capacitor C10; a 5 th pin of the voltage processing chip U3 is connected with one end of a twelfth capacitor C11, the other end of the twelfth capacitor C11 is grounded, a 6 th pin of the voltage processing chip U3 is connected with one end of a thirteenth capacitor C13, the other end of the thirteenth capacitor C13 is grounded, one end of the crystal oscillator Y1 is connected between the twelfth capacitor C11 and the 5 th pin, and the other end of the crystal oscillator Y1 is connected between the thirteenth capacitor C13 and the 6 th pin; the 7 th pin of the voltage processing chip U3 is grounded, the 8 th pin of the voltage processing chip U3 is connected to one end of a fourteenth capacitor C12, the other end of the fourteenth capacitor C12 is grounded, the 9 th pin of the voltage processing chip U3 is connected to one end of a fifteenth capacitor C14 and the negative electrode of a third diode D7, and the other end of the fifteenth capacitor C14 and the positive electrode of the third diode D7 are grounded.
Specifically, the 2 nd pin of the voltage processing chip U3 is a PD5 pin for transmitting data. The 4 th pin of the voltage processing chip U3 is the NRST pin for restart. The 5 th pin of the voltage processing chip U3 is a PA1 pin, which is a crystal oscillator pin, and the 6 th pin of the voltage processing chip U3 is a PA2 pin, which is a crystal oscillator pin. The 7 th pin of the voltage processing chip U3 is a VSS pin and is a ground pin. The 8 th pin of the voltage processing chip U3 is a VCAP pin for connecting a capacitor. The 9 th pin of the voltage processing chip U3 is a VDD pin for connecting a power supply. The 14 th pin of the voltage processing chip U3 is the PC4 pin for configuring the clock output or timer 1 channel 4 or analog input 2. In this way, the voltage processing chip U3 is used to convert the charging voltage of the battery cell 10 into its power information, thereby being transmitted to the upper stage through the serial port.
The fourth resistor R4 and the eleventh capacitor C10 form a power filter for suppressing power supply ripple. The second diode D4 is used for indicating battery power, and the crystal oscillator Y1, the twelfth capacitor C11 and the thirteenth capacitor C13 constitute a frequency selection circuit, wherein the frequency is determined by the crystal oscillator Y1, and the voltage signal with a specific frequency is filtered. The fourteenth capacitor C12 is used for voltage stabilization. The fifteenth capacitor C14 and the third diode D7 are used for filtering the ac signal in the power signal.
Further, referring to fig. 3, the voltage detection unit 40 includes: the voltage processing chip U3; wherein, the 14 th pin of the voltage processing chip U3 is connected with the battery unit 10.
Further, the voltage processing chip U3 is an STM8S003F3 chip.
In this way, the battery protection unit detects the charging voltage and the charging current, and the discharging voltage and the discharging current of the battery unit, thereby preventing the occurrence of the problem of overcharge or overdischarge and protecting the battery unit. The battery charge-discharge management unit converts external voltage into charging voltage of the battery unit, converts discharging voltage of the battery unit into voltage required by a device to be charged, ensures charge-discharge function of the battery unit, and can prevent the mobile power supply from overcurrent, overvoltage and the like in the charging process by applying the protection circuit to the mobile power supply so as to protect the battery in the mobile power supply.
In addition, the application also provides a mobile power supply, which comprises the protection circuit of the mobile power supply in the embodiment.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A protection circuit of a mobile power supply is characterized by comprising: the battery unit, the battery protection unit and the battery charge-discharge management unit;
the battery protection unit is connected with the battery unit and is used for carrying out overcharge and over-discharge protection on the charge and discharge of the battery unit;
the battery charging and discharging management unit is connected with the battery protection unit; wherein the content of the first and second substances,
the battery protection unit includes: the protection circuit comprises a protection chip, a first resistor, a first capacitor, a second capacitor and an external interface, wherein the first resistor, the first capacitor, the second capacitor and the external interface are connected with the protection chip;
the battery charge and discharge management unit includes: the charging management chip comprises a charging management chip, a first diode, a second resistor, a third capacitor, a fourth capacitor, a first indicator light, a second indicator light, a third indicator light, a fourth indicator light, an inductor, a third resistor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor and a tenth capacitor, wherein the first diode, the second resistor, the third capacitor, the fourth capacitor, the first indicator light, the second indicator light, the third indicator light, the fourth indicator light, the inductor, the third resistor, the fifth capacitor, the sixth capacitor.
2. The protection circuit of claim 1, further comprising: the voltage detection unit and the data processing and communication unit;
the voltage detection unit is connected with the battery unit;
the data processing and communication unit is connected with the voltage detection unit.
3. The protection circuit according to claim 1, wherein a 5 th pin, a 7 th pin, an 8 th pin and a 9 th pin of the protection chip are connected with a negative electrode of the battery unit, a 6 th pin of the protection chip is connected with one end of the first resistor, the other end of the first resistor is connected with a positive electrode of the battery unit, one end of the first capacitor is connected between the first resistor and the 6 th pin of the protection chip, the other end of the first capacitor is connected with the negative electrode of the battery unit, one end of the second capacitor is connected with the negative electrode of the battery unit, and the other end of the second capacitor is grounded; the external interface is connected with the positive electrode of the battery unit; and the No. 2 pin, the No. 3 pin and the No. 4 pin of the protection chip are all grounded.
4. The protection circuit according to claim 3, wherein the protection chip is an IP3005 chip.
5. The protection circuit according to any one of claims 1 to 4, wherein the pin 1 of the charge management chip is connected to a power supply, the cathode of the first diode is connected to the power supply, the cathode of the first diode is grounded, one end of the second resistor is connected to the pin 1 of the charge management chip, the other end of the second resistor is connected to one end of the third capacitor, and the other end of the third capacitor is grounded; one end of the fourth capacitor is connected with a No. 1 pin of the charging management chip, and the other end of the fourth capacitor is grounded; the positive pole of the first indicator light is connected with the 2 nd pin of the charging management chip, the negative pole of the first indicator light is connected with the 4 th pin of the charging management chip, the positive pole of the second indicator light is connected with the 4 th pin of the charging management chip, the negative pole of the second indicator light is connected with the 2 nd pin of the charging management chip, the positive pole of the third indicator light is connected with the 3 rd pin of the charging management chip, the negative pole of the third indicator light is connected with the 4 th pin of the charging management chip, the positive pole of the fourth indicator light is connected with the 4 th pin of the charging management chip, the negative pole of the fourth indicator light is connected with the 3 rd pin of the charging management chip, the 9 th pin of the charging management chip is grounded, the 6 th pin of the charging management chip is connected with one end of a fifth capacitor, and the other end of the fifth capacitor is grounded, a 7 th pin of the charging management chip is connected with one end of the inductor, the other end of the inductor is connected with one end of a third resistor, the other end of the third resistor is connected with a 6 th pin of the charging management chip, the sixth capacitor and the seventh capacitor are connected in parallel, one end of each capacitor is connected with the other end of the inductor, and the other end of each capacitor is grounded; the eighth capacitor, the ninth capacitor and the tenth capacitor are connected in parallel, one end of each capacitor is connected with the 8 th pin of the charging management chip, and the other end of each capacitor is grounded;
the other end of the inductor is connected with the battery protection unit.
6. The protection circuit according to claim 5, wherein the charge management chip is an IP5306 chip.
7. The protection circuit according to claim 2, wherein the data processing and communication unit comprises: the voltage processing chip, the second diode, the fourth resistor, the eleventh capacitor, the twelfth capacitor, the thirteenth capacitor, the crystal oscillator, the fourteenth capacitor, the third diode and the fifteenth capacitor;
the 2 nd pin of the voltage processing chip is connected with an upper computer, the cathode of the second diode is connected with the 2 nd pin of the voltage processing chip, and the anode of the second diode is grounded; one end of the fourth resistor is connected with a power supply, the other end of the fourth resistor is connected with one end of an eleventh capacitor, the other end of the eleventh capacitor is grounded, and a 4 th pin of the voltage processing chip is connected between the fourth resistor and the eleventh capacitor; a 5 th pin of the voltage processing chip is connected with one end of a twelfth capacitor, the other end of the twelfth capacitor is grounded, a 6 th pin of the voltage processing chip is connected with one end of a thirteenth capacitor, the other end of the thirteenth capacitor is grounded, one end of the crystal oscillator is connected between the twelfth capacitor and the 5 th pin, and the other end of the crystal oscillator is connected between the thirteenth capacitor and the 6 th pin; a 7 th pin of the voltage processing chip is grounded, an 8 th pin of the voltage processing chip is connected with one end of the fourteenth capacitor, the other end of the fourteenth capacitor is grounded, a 9 th pin of the voltage processing chip is connected with one end of the fifteenth capacitor and a cathode of the third diode, and the other end of the fifteenth capacitor and an anode of the third diode are grounded.
8. The protection circuit according to claim 7, wherein the voltage detection unit includes: the voltage processing chip; and the 14 th pin of the voltage processing chip is connected with the battery unit.
9. The protection circuit according to claim 7 or 8, wherein the voltage processing chip is an STM8S003F3 chip.
10. A mobile power supply, comprising the protection circuit of the mobile power supply according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021231350.6U CN213185542U (en) | 2020-06-29 | 2020-06-29 | Protection circuit of mobile power supply and mobile power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021231350.6U CN213185542U (en) | 2020-06-29 | 2020-06-29 | Protection circuit of mobile power supply and mobile power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213185542U true CN213185542U (en) | 2021-05-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021231350.6U Active CN213185542U (en) | 2020-06-29 | 2020-06-29 | Protection circuit of mobile power supply and mobile power supply |
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| Country | Link |
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| CN (1) | CN213185542U (en) |
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2020
- 2020-06-29 CN CN202021231350.6U patent/CN213185542U/en active Active
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