CN215646155U - Battery protection circuit and chip - Google Patents
Battery protection circuit and chip Download PDFInfo
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- CN215646155U CN215646155U CN202121504183.2U CN202121504183U CN215646155U CN 215646155 U CN215646155 U CN 215646155U CN 202121504183 U CN202121504183 U CN 202121504183U CN 215646155 U CN215646155 U CN 215646155U
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Abstract
The utility model provides a battery protection circuit and a chip, wherein the circuit comprises: the detection modules are connected with an external load circuit and are respectively configured to detect the load circuit to generate detection results when working; the detection modules are switched between working and dormancy states under the control of pulse signals output by the pulse output modules, at least one detection module works at the same time, and the other at least one detection module sleeps; and the control module is respectively connected with the plurality of detection modules and the external switch tube, and is configured to control the on-off of the switch tube according to the detection result. The battery protection circuit only starts at least one detection module to work within a certain time period, and the anti-interference capacity of the battery protection circuit is improved. Simultaneously also need not all detection circuitry of real-time control and detect like prior art, reduce the electric energy that detection circuitry consumed the battery, promote user experience.
Description
Technical Field
The utility model relates to the technical field of integrated circuits, in particular to a battery protection circuit and a chip.
Background
At present, in order to protect a battery, the battery is usually configured with corresponding functions of overcharge protection, overdischarge protection, charge overcurrent protection, discharge overcurrent protection, short-circuit protection and the like, and the realization of the functions depends on the detection of a detection circuit on a battery charge and discharge loop. Therefore, the detection of the detection circuit needs to work in real time, and when the charging and discharging loop of the battery is abnormal, the corresponding protection function can be started, so that the battery protection is realized. Although the battery can be protected in this way, the detection circuit is always in the working state, and a large amount of electric energy of the battery needs to be consumed, so that the electric energy consumption of the battery is too fast, and the user experience is affected.
SUMMERY OF THE UTILITY MODEL
Therefore, the present invention is directed to a battery protection circuit and a chip, which reduce the power consumption of a battery by a detection circuit and improve the user experience.
In a first aspect, a battery protection circuit includes:
the detection modules are connected with an external load circuit and are respectively configured to detect the load circuit to generate detection results when working;
the detection modules are switched between working and dormancy states under the control of pulse signals output by the pulse output modules, at least one detection module works at the same time, and the other at least one detection module sleeps;
and the control module is respectively connected with the detection modules and an external switch tube, and is configured to control the on-off of the switch tube according to the detection result.
Preferably, the battery protection circuit further includes:
and the plurality of reference sources are connected with the plurality of detection modules in a one-to-one correspondence manner.
Preferably, the battery protection circuit further includes:
the resistance voltage division module is connected between a power supply voltage end and a reference ground end, and is connected with at least one of the detection modules.
Preferably, the plurality of detection modules includes an overcharge voltage detection module and an overdischarge voltage detection module.
Preferably, the plurality of detection modules includes at least two of a charging overcurrent detection module, a discharging overcurrent detection module, a charger detection module, and a short circuit detection module.
Preferably, the battery protection circuit further includes:
and the VM output module is respectively connected with the plurality of detection modules and is configured to output the collected current of the load circuit to the detection modules.
Preferably, the period and/or duty cycle of the pulse signals are the same, and the trigger levels in the pulse signals are in different time intervals in the same time period.
Preferably, the control module comprises:
and the delay unit is used for sequentially delaying the trigger level output by the pulse output modules and is respectively connected with the pulse output modules.
Preferably, the control module comprises:
the signal comparison unit is connected with the pulse output modules respectively and is configured to compare the pulse signals with a preset clock signal to generate a comparison result, and the control module is further configured to control the on-off of the switch tube according to the comparison result and the detection result.
In a second aspect, a chip includes the battery protection circuit of the first aspect.
According to the battery protection circuit and the battery protection chip, only at least one detection module is started to work in a certain time period, so that the anti-interference capability of the battery protection circuit is improved. Simultaneously also need not all detection circuitry of real-time control and detect like prior art, reduce the electric energy that detection circuitry consumed the battery, promote user experience.
Drawings
In order to more clearly illustrate the detailed description of the utility model or the technical solutions in the prior art, the drawings that are needed in the detailed description of the utility model or the prior art will be briefly described below. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a block diagram of a battery protection circuit according to the present invention.
Fig. 2 is a circuit diagram of a pulse output module provided by the present invention.
Fig. 3 is a timing diagram of the pulse output module according to the present invention.
Fig. 4 is a block diagram of a battery protection circuit including a reference source according to the present invention.
Fig. 5 is a timing diagram of the delay of the pulse output module according to the present invention.
Fig. 6 is a block diagram of a battery protection circuit including a delay unit and a signal comparison unit according to the present invention.
Fig. 7 is a schematic diagram of a battery protection chip according to the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
The first embodiment is as follows:
a battery protection circuit 100, referring to FIG. 1, a plurality of detection modules 11 are connected to an external load circuit 200, and each of the plurality of detection modules 11 is configured to detect the load circuit 200 and generate a detection result when operating. The pulse output modules 12 are connected with the detection modules 11 in a one-to-one correspondence manner, the switching between the working state and the sleep state of the detection modules 11 is controlled by pulse signals output by the pulse output modules 12, at least one detection module 11 works at the same time, and the other at least one detection module 11 is in the sleep state. And a control module 13 connected to the plurality of detection modules 11 and the external switching tube 300, respectively, wherein the control module 13 is configured to control on/off of the switching tube 300 according to the detection result.
It should be noted that the "external load circuit 200" described in the present embodiment is "external" with respect to the battery protection circuit 100, and the specific location of the "external load circuit 200" is not limited. Similarly, the "external switch tube 300" is "external" with respect to the battery protection circuit 100, and the specific position of the "external switch tube 300" is not limited. The present embodiment is equivalent to the following external electronic component.
In this embodiment, the load circuit 200 may include circuitry for coordinating battery discharge and/or battery charging. The type of the load circuit 200 is not particularly limited herein. The switch tube 300 may be an NPN-type switch tube, a PNP-type switch tube, or the like, and in practical applications, a manufacturer may determine the connection relationship between the control module 13 and the switch tube 300 based on the type of the switch tube 300.
In this embodiment, the pulse output module 12 may be configured to output a pulse signal with an adjustable duty cycle and period. For example, when the pulse output module 12 outputs a high level to the detection module 11, the detection module 11 is driven to operate. When the pulse output module 12 outputs a low level to the detection module 11, the detection module 11 is driven to sleep. When the detection module 11 works, the load circuit 200 is detected; when the load circuit 200 is in sleep, the safety detection is stopped. At the same time, a part of the pulse output modules 12 may output a high level to at least one detection module 11, so as to drive the corresponding detection module 11 to operate. For example, only one detection module 11 may be driven to operate at different times.
The number of the pulse output modules 12(OSC) is determined according to the number of the detection modules 11, and may be set to six, for example, a first pulse output module (OSC1), a second pulse output module (OSC2), a third pulse output module (OSC3), a fourth pulse output module (OSC4), a fifth pulse output module (OSC5), and a sixth pulse output module (OSC 6). The high and low periods of the different pulse output modules 12(OSC) may be different. Each pulse output module 12 may output a pulse signal having the same period and duty ratio and different high-level times. For example, after the first pulse output module outputs the high level signal, the high level signals output by the other pulse output modules may be sequentially subjected to the delay processing.
As shown in fig. 2, the pulse output module 12 can be implemented by using the circuit of fig. 2. The pulse output module can comprise a comparator, a sub-controller, a switch K1, a switch K2, a capacitor C, a constant current source Ip and a constant current source In, one end of a switch K1 is connected with the constant current source Ip, the other end of the switch K1 is connected with one end of a switch K2, the other end of a switch K2 is connected with the constant current source In, a common junction formed by a switch K1 and a switch K2 is connected with one end of the capacitor C, the other end of the capacitor C is connected with a reference ground end, one end of the comparator is connected with one end of the capacitor C, and the other end of the comparator is connected with the sub-controller.
The comparator can obtain the voltage Vc at one end of the capacitor C, compare the voltage Vc with a preset first voltage threshold VthH, when the voltage Vc is equal to the first voltage threshold VthH, send a signal indicating that the voltage Vc is equal to the first voltage threshold VthH to the sub-controller, the sub-controller sends Sp to the switch K1 according to the signal, send Sn to the switch K2, at this time, the Sp signal is at a low level, the Sn signal is at a high level, control the switch K1 to be turned off, control the switch K2 to be turned on, so that the capacitor C enters an energy release state, and the size of the voltage Vc is reduced. The comparator can obtain the voltage Vc at one end of the capacitor C, compare the voltage Vc with a preset second voltage threshold VthL, when the voltage Vc is equal to the second voltage threshold VthL, send a signal for representing that the voltage Vc is equal to the second voltage threshold VthL to the sub-controller, the sub-controller sends Sp to the switch K1 according to the signal, send Sn to the switch K2, at this time, the Sp signal is at a high level, the Sn signal is at a low level, control the switch K1 to be turned on, and control the switch K2 to be turned off, so that the capacitor C enters a charging state, and the size of the voltage Vc is increased.
As shown in FIG. 3, when the voltage Vc is the voltage threshold VthHWhen the voltage is high, the control voltage Vc is increased, the control voltage is increased, and the control voltage is increased; voltage Vc is voltage threshold VthLWhen the voltage is high, Sp outputs low level, Sn outputs high level, and the control voltage Vc risesAt this time, the period of Sp or Sn may be used as the period of the pulse signal, and the high level of the pulse signal may be kept consistent with the high level of Sp or Sn. For example, Sp may be a pulse signal, Sn may be a pulse signal, and a CLK signal may be output using Sp or Sn as a reference and be a pulse signal.
The external switch tube 300 may include one or more switches, which may be specifically set based on actual circumstances. As shown in fig. 7, the switch tube 300 may include a power switch tube M1 and a power switch tube M2, gates of the power switch tube M1 and the power switch tube M2 are connected to the control module 13, and the control module 13 may control on and off of the power switch tube M1 and the power switch tube M2 by outputting high and low level signals. In addition, a parasitic diode may be provided in the power switch transistor M1, or a parasitic diode may be provided in the power switch transistor M2, and the specific structure of the switch transistor 300 is not particularly limited herein. The external switch tube 300 can be regarded as a peripheral electronic component of the battery protection circuit, and the control module 13 can directly control the on/off of the power switch tube M1 and the power switch tube M2.
In this embodiment, the detection module 11 may obtain a power parameter of the load circuit 200, and the detection module generates a detection result according to the power parameter and sends the detection result to the control module 13 for reference by the control module 13. Wherein the power parameter may be a current and/or a voltage.
In this embodiment, the control module 13 controls the on/off of the switching tube 300 according to the detection result, so as to protect the external load circuit 200. The circuit does not need to start all detection modules to work together at the same time in a certain time period, and only one or a part of the detection modules 11 can be started to work, so that mutual interference among all the detection modules is prevented, and the anti-interference capability of the battery protection circuit is improved. Simultaneously also need not all detection circuitry of real-time control and detect like prior art, reduce the electric energy that detection circuitry consumed the battery, promote user experience.
Further, in some embodiments, referring to fig. 4, the battery protection circuit 100 may further include: and the plurality of reference sources 14 are connected with the plurality of detection modules 11 in a one-to-one correspondence manner.
In this embodiment, the number of the reference sources 14 may be determined according to the number of the detection modules 11, and may be set to six, for example, the reference sources are a first reference source, a second reference source, a third reference source, a fourth reference source, a fifth reference source, and a sixth reference source, each reference source may output a reference voltage or a reference current, each reference voltage may be different, and each reference current may also be different. The number of the reference sources 14 and the pulse output modules 12 can be set according to actual conditions. That is, the reference source 14 may be used to provide a reference voltage to the detection module 11, and the setting of the reference voltage may be different for different detection modules 11; the reference source 14 may also be used to provide a reference current to the detection module 11, and the setting of the reference current may be different for different detection modules 11.
Further, in some embodiments, as shown in fig. 7, the battery protection circuit may further include: the resistance voltage division module 16 is connected between the power supply voltage terminal VCC and the ground reference terminal GND, and the resistance voltage division module 16 is connected with at least one of the plurality of detection modules 11.
In the present embodiment, the load circuit 200 may be connected to the supply voltage terminal VCC and the ground reference terminal GND (not shown in the figure). Specifically, when the load circuit 200 includes a circuit for discharging and/or charging a battery, the positive pole of the battery may be connected to the supply voltage terminal VCC, and the negative pole of the battery may be connected to the ground reference terminal GND; when the load circuit 200 includes a circuit for supplying power to the charger (e.g., supplying power to a battery, an overvoltage protection circuit), the positive terminal of the charger may be connected to the supply voltage terminal VCC.
In this embodiment, the detection module 11 may determine to collect the voltage between the power supply voltage terminal VCC and the ground reference terminal GND by detecting the voltages at the two ends of the resistance voltage dividing module 16, where the power supply voltage terminal VCC and the ground reference terminal GND may be the two ends of the load circuit 200 for supplying power. The resistance voltage dividing module 16 may include a resistance connected between the supply voltage terminal VCC and the ground reference terminal GND.
Further, in some embodiments, the plurality of detection modules 11 may include an overcharge voltage detection module and an overdischarge voltage detection module. At this time, the number of the reference sources 14 may be two, and the two reference sources may be a first reference source and a second reference source; the number of the pulse output modules 12 may be two, and the two pulse output modules 12 may be a first pulse output module and a second pulse output module; the first reference source and the first pulse output module are respectively connected with the overcharge voltage detection module, and the second reference source and the second pulse output module are respectively connected with the overdischarge voltage detection module.
In some examples, when the time when each pulse output module 11 outputs the high level coincides with the time when the clock signal in the control module 13 outputs the high level, the control module 13 may control the on/off of the external switching tube 300 based on the detection result.
In this embodiment, a high level may be used as a signal for triggering the detection module 12 to operate, when the first pulse output module outputs a high level (1), the overcharge voltage detection module may obtain a voltage of the load circuit 200 (for example, a voltage across the resistance voltage dividing module 16) and a reference overcharge voltage output by the first reference source, compare the voltage of the load circuit 200 with the reference overcharge voltage, determine whether the load circuit is in an overcharge state, generate a determination result, and send a detection result representing the determination result to the control module. On the contrary, when the first pulse output module outputs a low level (0), the first reference source may stop outputting the reference overcharge voltage, and the overcharge voltage detection module may stop detecting the voltage of the sampling resistor.
In this embodiment, a high level may be used as a signal for triggering the detection module 12 to operate, when the second pulse output module outputs a high level (1), the overdischarge voltage detection module may obtain a voltage of the load circuit 200 (for example, a voltage across the resistance voltage dividing module 16) and a reference overdischarge voltage output by the second reference source, compare the voltage of the load circuit 200 with the reference overdischarge voltage, determine whether the load circuit is in an overdischarge state, generate a determination result, and send a detection result used for representing the determination result to the control module. On the contrary, when the second pulse output module outputs a low level (0), the second reference source may stop outputting the reference overdischarge voltage, and the overdischarge voltage detection module may stop detecting the voltage of the resistance voltage division module.
Further, in some embodiments, the battery protection circuit 100 may further include:
and the VM output module is connected with the plurality of detection modules 11 respectively, and is configured to output the collected current of the load circuit to the detection modules 11.
In this embodiment, when the load circuit 200 includes a circuit for supplying power to a charger (e.g., a battery or an overvoltage protection circuit), the VM output module 15 may be connected to the charging negative terminal P —, the power supply voltage terminal VCC, and the VM output module 15 may have a function of collecting current.
In some embodiments, the VM output module 15 may further be connected to the control module 13, and the VM output module 15 may pull up or pull down the output VM signal when the circuit starts protection, so as to lock the circuit or chip after the protection is started or prevent a later false determination. For example, after overcurrent protection is started, a fixed current is pulled down for the VM signal to determine when the overcurrent state can be removed, and after overcharge, the VM signal is pulled up, etc.
Further, in some embodiments, the plurality of detection modules may include at least two of a charging overcurrent detection module, a discharging overcurrent detection module, a charger detection module, and a short circuit detection module.
In this embodiment, the number of the reference sources 14 may be four, and the four reference sources may be a third reference source, a fourth reference source, a fifth reference source and a sixth reference source; the number of the pulse output modules 12 may be four, and the four pulse output modules 12 may be a third pulse output module, a fourth pulse output module, a fifth pulse module and a sixth pulse module. The third reference source and the third pulse output module are respectively connected with the charging overcurrent detection module, the fourth reference source and the fourth pulse output module are respectively connected with the discharging overcurrent detection module, the fifth reference source and the fifth pulse output module are respectively connected with the charger detection module, and the sixth reference source and the sixth pulse output module are respectively connected with the short circuit detection module.
In this embodiment, a high level may be used as a signal for triggering the detection module 12 to operate, when the third pulse output module outputs a high level (1), the charging overcurrent detection module may further be connected to the VM output module 15, the charging overcurrent detection module may obtain a current of the load circuit 200 through the VM output module 15, and may further obtain a reference charging current output by a third reference source, compare the current of the load circuit 200 with the reference charging current, determine whether the load circuit 200 is in a charging overcurrent state, generate a determination result, and send a detection result used for representing the determination result to the control module 13. On the contrary, when the third pulse output module outputs a low level (0), the third reference source may stop outputting the reference current, and the charging overcurrent detection module may stop obtaining the current of the load circuit 200 through the VM output module.
In this embodiment, a high level may be used as a signal for triggering the detection module 12 to operate, when the fourth pulse output module outputs a high level (1), the discharging overcurrent detection module may obtain the current of the load circuit 200 through the VM output module 15, and may also obtain a reference discharging current output by a fourth reference source, compare the current of the load circuit 200 with the reference discharging current, determine whether the load circuit 200 is in a discharging overcurrent state, generate a determination result, and send a detection result representing the determination result to the control module 13. On the contrary, when the fourth pulse output module outputs a low level (0), the fourth reference source may stop outputting the reference current, and the discharging overcurrent detecting module may stop obtaining the current of the load circuit 200 through the VM output module.
In this embodiment, the high level may be used as a signal for triggering the detection module 12 to operate, when the fifth pulse output module outputs the high level (1), the charging detection module may obtain the current of the load circuit 200 through the VM output module 15, and may also obtain a reference charging voltage output by a fifth reference source, compare the current of the load circuit 200 with the reference charging voltage after converting the current into a voltage, determine whether the power supply voltage terminal VCC and the charging negative terminal P — are electrically connected to the charger, generate a determination result, and send a detection result used for representing the determination result to the control module 13. On the contrary, when the fifth pulse output module outputs the low level (0), the fifth reference source may stop outputting the reference charging voltage, and the charge detection module may stop obtaining the current of the load circuit 200 through the VM output module.
In this embodiment, the short circuit detection module may determine whether the positive electrode and the negative electrode of the load circuit are connected together, when the positive electrode and the negative electrode of the load circuit 200 (including a circuit of a battery and/or a charger) are short-circuited together, a discharge current may be large, a negative electrode potential of the load circuit 200 may become high, a VM signal collected by the VM output module is used as a current detection signal, and a voltage may also be very high, so as to determine whether the load circuit is short-circuited. In addition, the short circuit detection module may or may not be connected to the pulse output module and the reference source.
In some embodiments, a high level may be used as a signal for triggering the detection module 12 to operate, when the sixth pulse output module outputs a high level (1), the short circuit detection module may obtain the current of the load circuit 200 through the VM output module 15, and may also obtain a reference short circuit voltage output by a sixth reference source, compare the current of the load circuit 200 with the reference short circuit voltage after converting the current into a voltage, determine whether the load circuit 200 is in a short circuit state, generate a determination result, and send a detection result for representing the determination result to the control module 13. On the contrary, when the sixth pulse output module outputs the low level (0), the sixth reference source may stop outputting the reference short-circuit voltage, and the short-circuit detection module may stop obtaining the current of the load circuit 200.
Further, in some embodiments, the period and/or duty cycle of the plurality of pulse signals may be the same, and the trigger levels in the plurality of pulse signals are at different time intervals within the same time period.
In this embodiment, referring to fig. 5, for example, after the first pulse output module outputs the high level signal, the high level signals output by the other pulse output modules may be sequentially subjected to the delay processing. Specifically, after the high level signal output by the first pulse output module is ended, the second pulse output module outputs a high level signal, after the high level signal output by the second pulse output module is ended, the third pulse module outputs a high level signal, and so on, the high level signals output by the plurality of pulse output modules 11 can be referred to table 1. The manner of the high level signal and the low level signal outputted from the plurality of pulse output modules 11 may be as shown in fig. 5 below. It should be noted that the manner in which the plurality of pulse output modules 11 shown in table 1 below and fig. 5 output the high level signal and the low level signal is an example in practical application, and may be specifically adjusted based on actual requirements.
TABLE 1
Further, in some embodiments, referring to fig. 6, the control module 13 may include: the delay unit 131 sequentially delays the output of the trigger level from the plurality of pulse output modules 12, and is respectively connected to the plurality of pulse output modules 12.
In this embodiment, the delay unit may include a flip-flop, an oscillation circuit, and the like to delay the pulse signal output by the pulse output module 12, so that the trigger signals (for example, the trigger signal may be a high level signal) in the pulse signals output by the plurality of pulse output modules 12 may be sequentially cycled in a prescribed order, and thus, the plurality of detection modules 11 may be controlled to operate according to the received trigger signals sequentially cycled, such that one detection module 11 is turned on and another or more detection modules 11 are turned off at different time periods.
In the embodiment, in order to realize the high-level signal delay processing output by the pulse output module, the circuit is additionally provided with a delay unit connected with the pulse output module. The delay time of the delay unit can be defined according to the requirement of a user.
Further, in some embodiments, the control module may include: the signal comparison unit 132 is connected to the plurality of pulse output modules 12, the signal comparison unit 132 is configured to compare the pulse signals with a preset clock signal to generate a comparison result, and the control module 13 is further configured to control the on/off of the switching tube 300 according to the comparison result and the detection result.
In this embodiment, when the time when each pulse output module 11 outputs the high level coincides with the time when the clock signal in the control module 13 outputs the high level, the control module 13 may control the on/off of the external switching tube 300 based on the detection result. For example, the preset clock signal may be the OSC (pulse signal) shown in table 1 and fig. 7, for example, when the pulse signal (OSC1) output by the first pulse output module is a high level signal, the overcharge voltage detection module corresponding to the first pulse output module operates to generate a detection result and sends the detection result to the control module 13, the signal comparison unit 132 in the control module 13 may compare OSC1 and OSC, and when OSC1 and OSC are high level signals, the detection result may be determined to be valid; when OSC1 is a high signal and OSC1 is a low signal, it can be determined that the detection result is invalid. Similarly, the detection results of the second pulse output module, the third pulse output module, the fourth pulse output module, the fifth pulse output module and the sixth pulse output module are the same, and are not described herein again.
In this embodiment, after receiving the pulse signal output by the pulse output module 12, the signal comparison unit 132 compares the pulse signal with a preset clock signal, and if the comparison result is consistent, the on-off of the external switch tube is controlled based on the detection result, so that whether the detection module of the pulse output module 11 is valid or not can be detected, the pulse output module 11 is prevented from being triggered by mistake and the control module 13 is used for conducting misprocessing on the switch tube 300, and the stability of the battery protection circuit provided by this embodiment is improved.
Example two:
a battery protection chip, see FIG. 7, includes a VCC pin, a GND pin, a Vm pin, and a P-pin. The VCC pin can be connected to the positive pole of the load circuit; the GND pin can be connected with the negative pole of the load circuit; the P-pin can be connected with the negative pole of the charger; the Vm pin may be a port connected to a loop of the load circuit (a loop formed by the load circuit and the charger) for detecting the magnitude of the charging current.
The battery protection chip further comprises a plurality of detection modules 11, a plurality of pulse output modules 12 which are connected with the plurality of detection modules 11 in a one-to-one correspondence manner, and a control module 13 which is respectively connected with the plurality of detection modules 11, the VM output module 15 and an external switch tube 300. At least one detection module 11 is electrically connected with the resistance voltage division module 16. The resistance voltage-dividing module 16 is connected between the VCC pin and the GND pin. The output of the VM output module 15 is connected to the VM pin.
For a brief description, the chip provided by the embodiment of the present invention may refer to the corresponding content in the foregoing embodiments.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (10)
1. A battery protection circuit, comprising:
the detection modules are connected with an external load circuit and are respectively configured to detect the load circuit to generate detection results when working;
the detection modules are switched between working and dormancy states under the control of pulse signals output by the pulse output modules, at least one detection module works at the same time, and the other at least one detection module sleeps;
and the control module is respectively connected with the detection modules and an external switch tube, and is configured to control the on-off of the switch tube according to the detection result.
2. The battery protection circuit of claim 1, further comprising:
and the plurality of reference sources are connected with the plurality of detection modules in a one-to-one correspondence manner.
3. The battery protection circuit of claim 1, further comprising:
the resistance voltage division module is connected between a power supply voltage end and a reference ground end, and is connected with at least one of the detection modules.
4. The battery protection circuit of claim 1, wherein the plurality of detection modules comprises an overcharge voltage detection module and an overdischarge voltage detection module.
5. The battery protection circuit of claim 1, wherein the plurality of detection modules comprises at least two of a charging overcurrent detection module, a discharging overcurrent detection module, a charger detection module, and a short circuit detection module.
6. The battery protection circuit of claim 5, further comprising:
and the VM output module is respectively connected with the plurality of detection modules and is configured to output the collected current of the load circuit to the detection modules.
7. The battery protection circuit according to any one of claims 1 to 6, wherein the period and/or duty cycle of the plurality of pulse signals are the same, and the trigger levels in the plurality of pulse signals are at different time intervals within the same time period.
8. The battery protection circuit of claim 7, wherein the control module comprises:
and the delay unit is used for sequentially delaying the trigger level output by the pulse output modules and is respectively connected with the pulse output modules.
9. The battery protection circuit according to any one of claims 1 to 6, wherein the control module comprises:
the signal comparison unit is connected with the pulse output modules respectively and is configured to compare the pulse signals with a preset clock signal to generate a comparison result, and the control module is further configured to control the on-off of the switch tube according to the comparison result and the detection result.
10. A chip comprising the battery protection circuit of any one of claims 1 to 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114583664A (en) * | 2022-04-24 | 2022-06-03 | 深圳锐盟半导体有限公司 | Battery protection circuit and electronic equipment |
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