CN111030239A - Over-temperature protection charging management circuit, method and device and electronic equipment - Google Patents
Over-temperature protection charging management circuit, method and device and electronic equipment Download PDFInfo
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Abstract
The invention discloses an over-temperature protection charging management circuit, which comprises: the device comprises a charging management unit, a target current detection unit, a discharging current detection unit and a current distribution control circuit; the charging management unit outputs a target current to a load and a battery; the target current detection unit detects the magnitude of the target current; the discharge current detection unit detects the discharge current of the battery; when the current distribution control circuit receives an over-temperature protection signal, judging whether the working current of the load is smaller than the target current or not according to a discharge current signal and a target current signal; and when the working current is smaller than the target current, controlling the charging management unit to reduce the target current. The invention also provides an over-temperature protection charging management method, an over-temperature protection charging management device and electronic equipment, so that the target current is only supplied to a load and is not supplied to a battery, and the service life of the whole machine is prolonged.
Description
Technical Field
The invention relates to the field of over-temperature protection charging management, in particular to an over-temperature protection charging management method, circuit, device and electronic equipment.
Background
In the rechargeable battery power supply products on the market at present, charging over-temperature protection can occur when the battery is charged and discharged, the whole machine is easy to exhaust the electric quantity of the battery to shut down, and bad experience is brought to users. The charging circuit with path power supply management has the advantages that the peak power of load work exceeds the bearing capacity of the USB, the voltage of the USB and the voltage of the battery have a certain difference, the load can possibly pull the USB dead, and the requirement of simultaneous power supply of the USB and the battery cannot be met.
Disclosure of Invention
The invention mainly aims to provide an over-temperature protection charging management circuit, and aims to solve the technical problem that when charging over-temperature protection is carried out, the whole machine runs to exhaust the electric quantity of a battery and is shut down.
In order to achieve the above object, the present invention provides an over-temperature protection charging management circuit, including: the device comprises a charging management unit, a target current detection unit, a discharging current detection unit and a current distribution control circuit; wherein the content of the first and second substances,
the charging management unit is used for outputting target current to a load and a battery;
the target current detection unit is used for detecting the magnitude of the target current, generating a target current signal and outputting the target current signal to the current distribution control circuit;
the discharge current detection unit is used for detecting the discharge current of the battery, generating a discharge current signal and outputting the discharge current signal to the current distribution control circuit;
the current distribution control circuit is used for judging whether the working current of the load is smaller than the target current or not according to the discharge current signal and the target current signal when receiving an over-temperature protection signal;
and when the working current is smaller than the target current, controlling the charging management unit to reduce the target current.
Preferably, the input end of the charging management unit is connected with the charging interface, the output end of the charging management unit is connected with the input end of the target current detection unit, the output end of the target current detection unit is connected with the input end of the load, the first input end of the current distribution control circuit and the output end of the discharging current detection unit, the input end of the discharging current detection unit is connected with the second input end of the current distribution control circuit and the output end of the battery, the third input end of the current distribution control circuit is used for receiving an over-temperature protection signal, and the control end of the current distribution control circuit is connected with the controlled end of the charging management unit.
Preferably, the current distribution control circuit further includes: a level conversion circuit and a comparison circuit; wherein the content of the first and second substances,
the comparison circuit is used for receiving the discharge current signal and the target current signal, comparing whether the working current of the load is smaller than the target current according to the discharge current signal and the target current signal, and sending a current distribution control signal to the level conversion circuit when the working current is smaller than the target current;
the level conversion circuit is used for receiving an over-temperature protection signal, converting the over-temperature protection signal and the current distribution control signal to obtain a target current control signal, and outputting the target current control signal to the charging management unit to reduce the target current.
Preferably, the level shift circuit is further configured to trigger the comparison circuit to start operating when receiving the over-temperature protection signal.
Preferably, the comparison circuit is further configured to receive the discharge current signal and a working current signal of a load, and compare whether a working current of the load is smaller than the target current according to the discharge current signal and the working current signal, and when the working current is smaller than the target current, send a current distribution control signal to the level shift circuit.
Preferably, the charging management unit is further configured to receive the target current control signal sent by the level shift circuit, and reduce the target current to the operating current, so that the target current is only supplied to the load.
In addition, in order to achieve the above object, the present invention further provides an over-temperature protection charging management method, including:
the charging management unit outputs a target current to the load and the battery;
the target current detection unit detects the magnitude of the target current, generates a target current signal and outputs the target current signal to the current distribution control circuit;
the discharge current detection unit detects the discharge current of the battery, generates a discharge current signal and outputs the discharge current signal to the current distribution control circuit;
when receiving an over-temperature protection signal, the current distribution control circuit judges whether the working current of the load is smaller than the target current according to the discharge current signal and the target current signal;
and when the working current is smaller than the target current, controlling the charging management unit to reduce the target current.
Preferably, when the operating current is smaller than the target current, the step of controlling the charge management unit to reduce the target current specifically includes:
the charge management unit reduces the target current to the operating current so that the target current is supplied only to the load.
In addition, in order to achieve the above object, the present invention further provides an over-temperature protection charging management device, where the device includes the above over-temperature protection charging management circuit, or the device applies the above over-temperature protection charging management method.
In addition, in order to achieve the above object, the present invention further provides an electronic device, where the electronic device includes the over-temperature protection charging management circuit, or the electronic device applies the over-temperature protection charging management method.
The invention provides an over-temperature protection charging management circuit, which comprises: the device comprises a charging management unit, a target current detection unit, a discharging current detection unit and a current distribution control circuit; the charging management unit is used for outputting target current to a load and a battery; the target current detection unit is used for detecting the magnitude of the target current, generating a target current signal and outputting the target current signal to the current distribution control circuit; the discharge current detection unit is used for detecting the discharge current of the battery, generating a discharge current signal and outputting the discharge current signal to the current distribution control circuit; the current distribution control circuit is used for judging whether the working current of the load is smaller than the target current or not according to the discharge current signal and the target current signal when receiving an over-temperature protection signal; and when the working current is smaller than the target current, controlling the charging management unit to reduce the target current. By arranging the circuit, the target current is only supplied to the load and not supplied to the battery, so that the service life of the whole machine is prolonged.
Drawings
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a functional block diagram of a charging management circuit with over-temperature protection according to a first embodiment of the present invention;
FIG. 2 is a circuit diagram of a first embodiment of an over-temperature protection charging management circuit according to the present invention;
FIG. 3 is a functional block diagram of a charging management circuit with over-temperature protection according to a second embodiment of the present invention;
FIG. 4 is a circuit diagram of a second embodiment of an over-temperature protection charging management circuit according to the present invention;
fig. 5 is a schematic flowchart of a charging management method for over-temperature protection according to a first embodiment of the present invention;
fig. 6 is a flowchart illustrating a charging management method for over-temperature protection according to a second embodiment of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Charging management unit | U1A | Comparator with a |
| 200 | Target current detection unit | R1～R7 | First to |
| 300 | Discharge current detection unit | Q1～Q2 | First to |
| 400 | Current |
401 | |
| 500 | Load(s) | 402 | |
| 600 | Battery with a battery cell | USB | Charging interface |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should be considered to be absent and not within the protection scope of the present invention.
Referring to fig. 1 and 2, the present invention provides an over-temperature protection charging management circuit, including: a charge management unit 100, a target current detection unit 200, a discharge current detection unit 300, and a current distribution control circuit 400; wherein:
the input end of the charging management unit 100 is connected with a charging interface USB, the output end of the charging management unit 100 is connected with the input end of the target current detection unit 200, the output end of the target current detection unit 200 is connected with the input end of the load 500, the first input end of the current distribution control circuit 400 and the output end of the discharging current detection unit 300, the input end of the discharging current detection unit 300 is connected with the second input end of the current distribution control circuit 400 and the output end of the battery 600, the third input end of the current distribution control circuit 400 is used for receiving an over-temperature protection signal, and the control end of the current distribution control circuit 400 is connected with the controlled end of the charging management unit 100.
The charge management unit 100 is configured to output a target current I1 to the load 500 and the battery 600;
it is easy to understand that the charging management unit 100 can convert the electric energy input by the USB of the charging interface into the current suitable for the electronic device, and supply the target current I1 to the load 500 to charge the battery 600. The charging management unit 100 can adjust the target current I1 according to the current circuit condition. This causes the battery 600 to discharge while charging, and when the operating temperature of the battery 600 is too high, over-temperature protection of charging occurs.
It is easy to understand that, when the load 500 is operating, if the operating current I3 required by the present load is greater than the target current I1, the battery 600 and the charge management unit 100 will transmit power to the load 500 together; when the power required by the load 500 is small, the load 500 may be separately supplied with power by the charge management unit 100, and the surplus power may be charged in the battery 600. However, in the over-temperature state, the battery 600 will lose the service life due to the continuous charging and discharging, and the target current I1 needs to be controlled to be reduced to prevent the battery loss due to the continuous charging.
It should be noted that the charge management unit 100 is further configured to receive the target current control signal sent by the level shift circuit 402, and reduce the target current I1 to the operating current I3, so that the target current I1 is only supplied to the load 500.
The target current detection unit 200 is configured to detect a magnitude of the target current I1, generate a target current signal, and output the target current signal to the current distribution control circuit 400;
in this embodiment, the target current detection unit 200 is a first resistor R1, a first end of the first resistor R1 is connected to the output end of the charge management unit 100, and a second end of the first resistor R1 is connected to the load 500, a first end of the discharge current detection unit 300, and a first input end of the current distribution control circuit 400.
The discharge current detection unit 300 is configured to detect a magnitude of a discharge current I2 of the battery, generate a discharge current signal, and output the discharge current signal to the current distribution control circuit 400.
In this embodiment, the discharge current detection unit 300 is a second resistor R2, a first end of the second resistor R2 is connected to a first end of the first resistor R1, the load 500, and a first input end of the current distribution control circuit 400, and a second end of the second resistor R2 is connected to the battery 600 and a second input end of the current distribution control circuit 400.
The current distribution control circuit 400 is configured to determine whether the working current I3 of the load is less than the target current I1 according to the discharge current signal and the target current signal when receiving the over-temperature protection signal. The current distribution control circuit 400 further includes: a level conversion circuit 402 and a comparison circuit 401; wherein:
the comparison circuit 401 is configured to receive the discharge current signal and the target current signal, and compare whether an operating current I3 of the load is smaller than the target current according to the discharge current signal and the target current signal, and send a current distribution control signal to the level shift circuit 402 when the operating current I3 is smaller than the target current I1.
The comparison circuit 401 includes: the seventh resistor R7, the sixth resistor R6, and the comparator U1A, the comparator U1A may also be replaced by an operational amplifier, and the device type is not limited herein, as long as the corresponding function can be achieved, which is within the protection scope of the present invention. A second terminal of the seventh resistor R7 is connected to the output terminal of the battery 600 and a second terminal of the second resistor R2, a first terminal of the seventh resistor R7 is connected to a first terminal of the sixth resistor R6 and the reverse terminal of the comparator U1A, and a second terminal of the sixth resistor R6 is connected to the level shifter circuit 402 and the battery 600. The non-inverting terminal of the comparator U1A is connected to the first terminal of the second resistor R2, the second terminal of the first resistor R1 and the input terminal of the load 500.
The level shift circuit 402 is configured to receive an over-temperature protection signal, convert the over-temperature protection signal and the current distribution control signal to obtain a target current control signal, and output the target current control signal to the charge management unit 100 to reduce the target current I1.
The level shift circuit includes: a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first transistor Q1 and a second transistor Q2. A first end of the third resistor R3 is connected to the controlled end of the charge management unit 100 and a first end of the fourth resistor R4, a second end of the third resistor R3 is connected to a first end of the first resistor R1, a second end of the fourth resistor R4 is connected to a collector of the first transistor Q1, an emitter of the first transistor Q1 is connected to an emitter of the second transistor Q2 and a second end of the sixth resistor R6, a base of the first transistor Q1 is connected to a first end of the fifth resistor R5 and a collector of the second transistor Q2, and a base of the second transistor Q2 is configured to receive an over-temperature protection signal; the second end of the fifth resistor R5 is connected with the output end of the comparator U1A.
The level shift circuit 402 is further configured to trigger the comparison circuit 401 to start operating when receiving the over-temperature protection signal.
In the level shift circuit 402, the third resistor R3 and the fourth resistor R4 form a target current I1 bias, the first transistor Q1 is used for controlling the target current I1, and the second transistor Q2 is used for transmitting the over-temperature protection signal. In the comparison circuit 401, the seventh resistor R7 and the sixth resistor R6 bias the set of discharge currents I2.
When the over-temperature protection signal is not received, the second transistor Q2 is turned on, the first transistor Q1 is turned off, and the current distribution control circuit 400 does not function, i.e., does not start operating. When the over-temperature protection signal is received, the second triode Q2 is turned off, and if the required working current I3 of the load 500 is greater than the target current I1 at the moment, the load 500 is supplied with power by the discharging current I2 and the target current I1 together. If the required operating current I3 of 500 at this time is equal to or less than the target current I1, the discharge current I2 approaches zero. At this time, the bias voltage formed by the seventh resistor R7 and the sixth resistor R6 and the voltage on the second resistor R2 make the in-phase terminal of the comparator U1A larger than the reverse terminal, the comparator U1A outputs a high level, so that the first triode Q1 is turned on, and since the third resistor R3 and the fourth resistor R4 form a bias, the charging management unit 100 receives the target current control signal, so that the target current I1 is controlled to be reduced.
The circuit of the embodiment enables the charging circuit to realize closed-loop control, and ensures that when the battery exceeds the charging stability, the charging management unit 100 only supplies current to the load 500 and does not supply current to the battery 600, thereby ensuring the service life of the battery, and prolonging the service life of the battery under the condition that charging is stopped.
Referring to fig. 3 and 4, a second embodiment of the over-temperature protection charge management circuit of the present invention is proposed based on the first embodiment of the over-temperature protection charge management circuit of the present invention.
It should be noted that, if the charging management unit 100 has an independent target current control pin, the target current control pin of the charging management unit 100 can be directly controlled by the current distribution control circuit 400. At this time, the target current detection unit 200 may not be used in the circuit, and this embodiment is improved based on the circuit of the first embodiment, and the level shift circuit 402 is adaptively improved to perform the corresponding function as in the first embodiment, which is not limited in this embodiment.
It should be noted that the comparison circuit 401 is further configured to receive the discharge current signal and an operating current signal of a load, and compare whether an operating current I3 of the load is less than the target current I1 according to the discharge current signal and the operating current signal, and when the operating current I3 is less than the target current I1, send a current distribution control signal to the level shift circuit 402.
It is easy to understand that the non-inverting terminal of the comparator U1A is connected to the input terminal of the load 500, and the input terminal of the comparator U1A can sample the operating current signal of the load 500 and receive the operating current signal and the bias formed by the seventh resistor R7 and the sixth resistor R6 received at the inverting terminal, and the voltage on the second resistor R2. So that the non-inverting terminal is larger than the inverting terminal, the comparator U1A outputs a high level to the level shifter circuit 402.
The circuit of the embodiment enables the charging circuit to realize closed-loop control, and ensures that when the battery exceeds the charging stability, the charging management unit 100 only supplies current to the load 500 and does not supply current to the battery 600, thereby ensuring the service life of the battery, and prolonging the service life of the battery under the condition that charging is stopped. The original devices are utilized, the arrangement of the circuit is simplified, the wiring of the circuit is easier, and the user experience is optimized.
Based on the circuit of the first embodiment of the over-temperature protection charging management circuit of the present invention, the present invention further provides an over-temperature protection charging management method, as shown in fig. 5, in the first embodiment of the over-temperature protection charging management method of the present invention, the method includes:
step S100: the charge management unit 100 outputs a target current I1 to the load 500 and the battery 600.
It is easy to understand that the charging management unit 100 can convert the electric energy input by the USB of the charging interface into the current suitable for the electronic device, and supply the target current I1 to the load 500 to charge the battery 600. The charging management unit 100 can adjust the target current I1 according to the current circuit condition. This causes the battery 600 to discharge while charging, and when the operating temperature of the battery 600 is too high, over-temperature protection of charging occurs.
It is easy to understand that, when the load 500 is operating, if the operating current I3 required by the present load is greater than the target current I1, the battery 600 and the charge management unit 100 will transmit power to the load 500 together; when the power required by the load 500 is small, the load 500 may be separately supplied with power by the charge management unit 100, and the surplus power may be charged in the battery 600. However, in the over-temperature state, the battery 600 will lose the service life due to the continuous charging and discharging, and the target current I1 needs to be controlled to be reduced to prevent the battery loss due to the continuous charging.
Step S200: the target current detection unit 200 detects the magnitude of the target current I1, generates a target current signal, and outputs the target current signal to the current distribution control circuit 400; the discharge current detection unit 300 detects the magnitude of the discharge current I2 of the battery 600, generates a discharge current signal, and outputs the discharge current signal to the current distribution control circuit 400.
Step S300: when receiving the over-temperature protection signal, the current distribution control circuit 400 determines whether the operating current I3 of the load 500 is less than the target current I1 according to the discharge current signal and the target current signal.
It should be noted that the circuit distribution control circuit 400 can be triggered to be turned on only when receiving the over-temperature protection signal, so as to perform the circuit distribution control function.
Step S400: when the operating current I3 is less than the target current I1, controlling the charge management unit 100 to reduce the target current I1.
It should be noted that the charge management unit 100 controls the target current I1 to decrease so that the target current I1 is not supplied to the battery 600.
The method of the embodiment enables the charging circuit to realize closed-loop control, ensures that the charging management unit 100 only provides current to the load 500 and does not supply current to the battery 600 when the battery exceeds the charging stability, ensures the service life of the battery, and prolongs the service life of the battery under the condition that the charging is stopped.
Based on the circuit of the second embodiment of the over-temperature protection charging management circuit of the present invention, the present invention further provides an over-temperature protection charging management method, as shown in fig. 6, where the step S100 includes:
step S201: the discharge current detection unit 100 detects the magnitude of the discharge current I2 of the battery 600, generates a discharge current signal, and outputs the discharge current signal to the current distribution control circuit 400.
It should be noted that, if the charging management unit 100 has an independent target current control pin, the target current control pin of the charging management unit 100 can be directly controlled by the current distribution control circuit 400. The target current detection unit 200 may not be used in the circuit at this time.
Step S301: when receiving the over-temperature protection signal, the current distribution control circuit 400 compares whether the operating current I3 of the load 500 is less than the target current I1 according to the discharge current signal and the operating current signal.
It is easy to understand that the non-inverting terminal of the comparator U1A is connected to the input terminal of the load 500, and the input terminal of the comparator U1A can sample the operating current signal of the load 500 and receive the operating current signal and the bias formed by the seventh resistor R7 and the sixth resistor R6 received at the inverting terminal, and the voltage on the second resistor R2. So that the non-inverting terminal is larger than the inverting terminal, the comparator U1A outputs a high level to the level shifter circuit 402.
It is easily understood that step S400 is still performed after step S301 to complete the reduction of the target current I1 so that the battery 600 is not charged.
The circuit of the embodiment enables the charging circuit to realize closed-loop control, and ensures that when the battery exceeds the charging stability, the charging management unit 100 only supplies current to the load 500 and does not supply current to the battery 600, thereby ensuring the service life of the battery, and prolonging the service life of the battery under the condition that charging is stopped. The original devices are utilized, the arrangement of the circuit is simplified, the wiring of the circuit is easier, and the user experience is optimized.
The invention also provides an over-temperature protection charging management device, which comprises the over-temperature protection charging management circuit or applies the over-temperature protection charging management method. Since the present apparatus employs all technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and are not described in detail herein.
The invention also provides electronic equipment which comprises the over-temperature protection charging management circuit or applies the over-temperature protection charging management method. Since the electronic device adopts all technical solutions of all the embodiments, at least all the beneficial effects brought by the technical solutions of the embodiments are achieved, and no further description is given here.
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An over-temperature protection charge management circuit, the circuit comprising: the device comprises a charging management unit, a target current detection unit, a discharging current detection unit and a current distribution control circuit; wherein the content of the first and second substances,
the charging management unit is used for outputting target current to a load and a battery;
the target current detection unit is used for detecting the magnitude of the target current, generating a target current signal and outputting the target current signal to the current distribution control circuit;
the discharge current detection unit is used for detecting the discharge current of the battery, generating a discharge current signal and outputting the discharge current signal to the current distribution control circuit;
the current distribution control circuit is used for judging whether the working current of the load is smaller than the target current or not according to the discharge current signal and the target current signal when receiving an over-temperature protection signal;
and when the working current is smaller than the target current, controlling the charging management unit to reduce the target current.
2. The over-temperature protection charging management circuit according to claim 1, wherein an input terminal of the charging management unit is connected to a charging interface, an output terminal of the charging management unit is connected to an input terminal of the target current detection unit, an output terminal of the target current detection unit is connected to an input terminal of the load, a first input terminal of the current distribution control circuit, and an output terminal of the discharging current detection unit, an input terminal of the discharging current detection unit is connected to a second input terminal of the current distribution control circuit and an output terminal of the battery, a third input terminal of the current distribution control circuit is configured to receive an over-temperature protection signal, and a control terminal of the current distribution control circuit is connected to a controlled terminal of the charging management unit.
3. The over-temperature protection charge management circuit of claim 2, wherein the current share control circuit further comprises: a level conversion circuit and a comparison circuit; wherein the content of the first and second substances,
the comparison circuit is used for receiving the discharge current signal and the target current signal, comparing whether the working current of the load is smaller than the target current according to the discharge current signal and the target current signal, and sending a current distribution control signal to the level conversion circuit when the working current is smaller than the target current;
the level conversion circuit is used for receiving an over-temperature protection signal, converting the over-temperature protection signal and the current distribution control signal to obtain a target current control signal, and outputting the target current control signal to the charging management unit to reduce the target current.
4. The over-temperature protection charge management circuit of claim 3, wherein the level shift circuit is further configured to trigger the comparison circuit to start operating when receiving the over-temperature protection signal.
5. The over-temperature protection charge management circuit according to claim 3, wherein the comparison circuit is further configured to receive the discharge current signal and an operating current signal of a load, and compare whether the operating current of the load is smaller than the target current according to the discharge current signal and the operating current signal, and when the operating current is smaller than the target current, send a current distribution control signal to the level shift circuit.
6. The over-temperature protection charge management circuit according to claim 3, wherein the charge management unit is further configured to receive the target current control signal sent by the level shift circuit, and reduce the target current to the working current, so that the target current is only supplied to the load.
7. An over-temperature protection charging management method, characterized in that the method comprises:
the charging management unit outputs a target current to the load and the battery;
the target current detection unit detects the magnitude of the target current, generates a target current signal and outputs the target current signal to the current distribution control circuit;
the discharge current detection unit detects the discharge current of the battery, generates a discharge current signal and outputs the discharge current signal to the current distribution control circuit;
when receiving an over-temperature protection signal, the current distribution control circuit judges whether the working current of the load is smaller than the target current according to the discharge current signal and the target current signal;
and when the working current is smaller than the target current, controlling the charging management unit to reduce the target current.
8. The over-temperature protection charge management method according to claim 7, wherein the step of controlling the charge management unit to reduce the target current when the operating current is smaller than the target current specifically comprises:
the charge management unit reduces the target current to the operating current so that the target current is supplied only to the load.
9. An over-temperature protection charge management device, characterized in that the device comprises the over-temperature protection charge management circuit according to any one of claims 1 to 6, or the device applies the over-temperature protection charge management method according to any one of claims 7 to 8.
10. An electronic device, characterized in that the electronic device comprises the over-temperature protection charging management circuit according to any one of claims 1 to 6, or the electronic device applies the over-temperature protection charging management method according to any one of claims 7 to 8.
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| US6462515B1 (en) * | 2000-03-15 | 2002-10-08 | Mitsubishi Denki Kabushiki Kaisha | Cell protective circuit |
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| CN111030239B (en) | 2024-02-13 |
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