Battery over-discharge protection circuit and aerosol generating device

Abstract

The invention belongs to the field of batteries, and relates to a battery over-discharge protection circuit and an aerosol generation device, and the battery over-discharge protection circuit comprises a voltage detection module, a current control module and an output module. One end of the voltage detection module is connected with the input end, the other end of the voltage detection module is connected with the grounding end, and the input end and the grounding end are respectively connected with the anode and the cathode of the battery; one end of the current control module is connected with the voltage detection module, and the current control module is disconnected when the voltage detection module detects that the voltage corresponding to the battery capacity is lower than a preset discharge protection threshold voltage; the other end of the current control module is connected with the output module, one end of the output module is connected with the input end, the other end is connected with the output end, and the output module is used for controlling a path between the input end and the output end to be disconnected for discharge protection when the current control module is disconnected. According to the invention, over-discharge protection can be conveniently and effectively carried out on the battery with low battery capacity.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more particularly, to a battery over-discharge protection circuit and an aerosol generating device. Background Art

[0002] Lithium-ion batteries or lithium-ion polymer batteries are widely used in electronic products. During the use of lithium-ion batteries or lithium-ion polymer batteries, when the battery power itself is low, there will be an over-discharge phenomenon. Once the lithium-ion battery or lithium-ion polymer battery experiences over-discharge, it will cause irreversible permanent damage to the battery itself. Therefore, it is necessary to protect the over-discharge of lithium-ion batteries or lithium-ion polymer batteries.

[0003] When protecting the over-discharge of lithium-ion batteries or lithium-ion polymer batteries, a comparator is usually used to compare the battery capacity of the collected battery with a preset protection threshold voltage. When the battery capacity of the battery is less than the protection threshold voltage, the circuit is controlled through controller software or corresponding control logic algorithms to achieve the protection of the battery over-discharge. This control circuit not only has a high cost, but also requires setting corresponding algorithms for control, and the circuit design is relatively complex, which is not conducive to production applications. Summary of the Invention

[0004] The technical problem to be solved by the embodiments of the present application is how to conveniently and effectively protect the battery from over-discharge.

[0005] To solve the above technical problem, the embodiments of the present application provide a battery over-discharge protection circuit, which adopts the following technical solutions:

[0006] A battery over-discharge protection circuit includes: a voltage detection module, a current control module, and an output module;

[0007] One end of the voltage detection module is connected to the input terminal, and the other end is connected to the ground terminal. The input terminal and the ground terminal are respectively used to connect the positive and negative electrodes of the battery, and the voltage detection module is used to detect the battery capacity of the battery;

[0008] One end of the current control module is connected to the voltage detection module, and is used to disconnect the current control module when the voltage corresponding to the battery power detected by the voltage detection module is lower than a preset discharge protection threshold voltage;

[0009] The other end of the current control module is connected to the output module. One end of the output module is connected to the input terminal, and the other end is connected to the output terminal. The output module is used to control the disconnection of the path between the input terminal and the output terminal for discharge protection when the current control module is disconnected.

[0010] Further, the voltage detection module includes a first resistor and a Zener diode. The first resistor is connected to the input terminal. The Zener diode is connected in reverse between the first resistor and the ground terminal. The current control module is connected between the first resistor and the Zener diode.

[0011] Further, the current control module includes a second resistor, a third resistor, and a first transistor. The first transistor is connected to the Zener diode and is configured to turn off when the Zener diode control circuit is cutoff or turn on when the Zener diode breaks down. The second resistor is connected between the first transistor and the input terminal. The third resistor is connected between the first transistor and the output module.

[0012] Further, the first transistor is a PNP triode. The base of the PNP triode is connected to one end of the Zener diode. The emitter of the PNP triode is connected to the second resistor and the third resistor. The collector of the PNP triode is connected to the ground terminal.

[0013] Further, the current control module further includes a filter capacitor. One end of the filter capacitor is connected to the output terminal, and the other end is connected to the collector of the PNP triode.

[0014] Further, the filter capacitor is a multilayer ceramic capacitor.

[0015] Further, the output module includes a second transistor. One end of the second transistor is connected to the input terminal, and the other end is connected to the output terminal. The second transistor is configured to control the conduction between the input terminal and the output terminal when the first transistor is on or control the disconnection between the input terminal and the output terminal when the first transistor is off.

[0016] Further, the second transistor is a P-type MOS transistor. The voltage detection module is connected to the gate of the P-type MOS transistor. The input terminal and the output terminal are respectively connected to the source and the drain of the P-type MOS transistor.

[0017] To solve the above technical problems, an embodiment of the present application further provides an aerosol generating device, which adopts the battery over-discharge protection circuit as described above.

[0018] Compared with the prior art, the embodiments of the present application mainly have the following beneficial effects:

[0019] By providing a battery over-discharge protection circuit including a voltage detection module, a current control module, and an output module, this application can effectively detect the battery power through the voltage detection module when the battery is connected to the circuit. When the voltage corresponding to the detected battery power is less than the preset discharge protection threshold voltage, the current input to the current control module is cut off. After the current control module stops receiving the current input from the voltage detection module, it controls the circuit to disconnect. After the circuit of the voltage detection module is disconnected, the output module controls the circuit between the input terminal and the output terminal to disconnect accordingly, so as to conveniently and effectively protect the battery with low battery capacity from over-discharge. Brief Description of the Drawings

[0020] To more clearly illustrate the solutions in this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following-described drawings are some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic structural diagram of an alternative embodiment of the battery over-discharge protection circuit of the present invention.

[0022] Figure 2 It is a schematic circuit diagram of an alternative embodiment of the battery over-discharge protection circuit of the present invention.

[0023] Reference Numerals: Voltage Detection Module 1, Current Control Module 2, Output Module 3, First Transistor Q1, Second Transistor Q2, First Resistor R1, Second Resistor R2, Third Resistor R3, Zener Diode D1, Filter Capacitor C1. Detailed Embodiments

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used in the description of the embodiments of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of this application or the above drawings are used to distinguish different objects and are not used to describe a specific order.

[0025] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of the present application. The appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they independent or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0027] Reference Figure 1 , an embodiment of the present application provides a battery over-discharge protection circuit, including:

[0028] a voltage detection module 1, a current control module 2, and an output module 3;

[0029] One end of the voltage detection module 1 is connected to the input terminal Input, and the other end is connected to the ground terminal PGND. The input terminal Input and the ground terminal PGND are respectively used to connect the positive and negative electrodes of the battery. The voltage detection module 1 is used to detect the battery capacity of the battery.

[0030] One end of the current control module 2 is connected to the voltage detection module 1, and is used to disconnect the current control module 2 when the voltage corresponding to the battery power detected by the voltage detection module 1 is lower than a preset discharge protection threshold voltage.

[0031] The other end of the current control module 2 is connected to the output module 3. One end of the output module 3 is connected to the input terminal Input, and the other end is connected to the output terminal Output. The output module 3 is used to control the disconnection of the path between the input terminal Input and the output terminal Output for discharge protection when the current control module 2 is disconnected.

[0032] In this embodiment, the battery is a lithium-ion battery or a lithium-ion polymer battery. One end of the output module 3 is connected to the positive and negative electrodes of the lithium-ion battery or the lithium-ion polymer battery through the input terminal Input to form a main discharge control loop.

[0033] By providing a battery over-discharge protection circuit including a voltage detection module 1, a current control module 2, and an output module 3, this application can effectively detect the battery power through the voltage detection module 1 when the battery is connected to the circuit. When the voltage corresponding to the detected battery power is less than the preset discharge protection threshold voltage, the current input to the current control module 2 is cut off. After the current control module 2 does not receive the current input from the voltage detection module 1, it controls the circuit to disconnect. After the circuit of the voltage detection module 1 is disconnected, the output module 3 controls the circuit between the input terminal Input and the output terminal Output to disconnect correspondingly, so as to conveniently and effectively protect the battery with a low battery capacity from over-discharge.

[0034] The following describes Figure 2 the identified circuit elements in it. Input is the input terminal, Output is the output terminal, PGND is the ground terminal, Q1 is the first transistor, Q2 is the second transistor, R1 is the first resistor, R2 is the second resistor, R3 is the third resistor, D1 is the Zener diode, and C1 is the filter capacitor.

[0035] In this embodiment, referring to Figure 2 , the voltage detection module 1 includes a first resistor R1 and a Zener diode D1. The first resistor R1 is connected to the input terminal Input, and the Zener diode D1 is reversely connected between the first resistor R1 and the ground terminal PGND. The current control module 2 is connected between the first resistor R1 and the Zener diode D1.

[0036] In this embodiment, by reversely connecting the Zener diode D1 between the first resistor R1 and the ground terminal PGND, the loop formed between the battery and the circuit is effectively cut off to ensure that the battery cannot effectively discharge.

[0037] The current control module 2 includes a second resistor R2, a third resistor R3, a first transistor Q1, and a filter capacitor C1. The second resistor R2 is in series with the emitter of the first transistor Q1. One end of the third resistor R3 is connected to the first transistor Q1, and the other end is connected to the second transistor Q2. The current control module 2 is also connected in parallel between the input terminal Input and the output terminal Output. The filter capacitor C1 is a multilayer ceramic capacitor. One end of the filter capacitor C1 is connected between the second transistor Q2 and the output terminal Output, and the other end is connected to the first transistor Q1. In this embodiment, the first transistor Q1 is a PNP triode. One end of the base of the PNP triode is connected to one end of the Zener diode D1. One end of the emitter of the PNP triode is connected to the second resistor R2 and the third resistor R3. One end of the collector of the PNP triode is connected to the ground terminal PGND.

[0038] In this embodiment, a filter capacitor C1 is connected between the output terminal Output and the ground terminal PGND, thereby effectively forming a low-pass filter circuit between the output terminal Output and the ground terminal PGND, and effectively filtering out the non-DC component current or part of the interference circuit, playing a certain role in smoothing the power supply output. At the same time, by setting the first transistor Q1 as a PNP triode, the first transistor Q1 can be turned off when the Zener diode D1 is cut off, or turned on when the Zener diode D1 breaks down, so as to control the on-off of the current input to the output module 3.

[0039] In this embodiment, the discharge protection threshold voltage is the breakdown voltage of the Zener diode D1. When the voltage of the circuit connected to the Zener diode D1 is greater than or equal to the breakdown voltage, the Zener diode D1 will be reversely broken down and conduct the reverse drive current. When the voltage of the circuit connected to the Zener diode D1 is less than the breakdown voltage, the Zener diode D1 will not be reversely broken down, so the circuit of the voltage detection module 1 is cut off. The second resistor R2 and the third resistor R3 can effectively protect the circuit to improve the safety of the circuit during discharge. In this embodiment, the breakdown voltage of the Zener diode D1 in the circuit is 3.1V. The breakdown voltage of the Zener diode D1 is adjusted according to the manufacturing materials and actual design conditions to set the discharge protection threshold voltage according to the actual situation of the circuit. The discharge protection threshold voltage in this embodiment is only an example and can be adjusted actually.

[0040] The output module 3 includes a second transistor Q2. The second transistor Q2 is connected in series between the input terminal Input and the output terminal Output. The source electrode of the second transistor Q2 is connected to the input terminal, and the drain electrode of the second transistor Q2 is connected to the output terminal Output. In this embodiment, the second transistor Q2 is a P-type MOS transistor, the voltage detection module 1 is connected to the gate of the P-type MOS transistor, and the input terminal Input and the output terminal Output are respectively connected to the source electrode and the drain electrode of the P-type MOS transistor.

[0041] In this embodiment, by setting a P-type MOS transistor between the input terminal Input and the output terminal Output, the on-off control of the circuit between the input terminal Input and the output terminal Output can be realized through the on-conduction characteristics and cut-off characteristics of the P-type MOS transistor, so as to realize the automatic control of the over-discharge of the battery and effectively save costs at the same time.

[0042] The discharge protection principle of this embodiment is as follows: The second resistor R2, the third resistor R3, and the PNP transistor Q1 constitute the action circuit for the discharge protection of the main circuit of a lithium-ion battery or a lithium-ion polymer battery. When the capacity of the lithium-ion battery or the lithium-ion polymer battery is lower than the discharge protection threshold voltage, the voltage detection module composed of the first resistor R1 and the Zener diode D1 detects the input voltage of the circuit. At this time, the Zener diode D1 cannot undergo Zener breakdown or avalanche breakdown at the threshold voltage of the lithium-ion battery or the lithium-ion polymer battery; the PNP transistor Q1 is turned off because there is no reverse drive current. When the PNP transistor Q1 is turned off, the gate of the P-type MOS transistor Q2 in the main circuit is connected to the positive electrode of the lithium-ion battery through the second resistor R2, the third resistor R3, forming a positive voltage between the gate and the source of the P-type MOS transistor Q2 in the main circuit, thereby controlling the P-type MOS transistor Q2 to turn off, forming over-discharge protection for the battery.

[0043] The second resistor R2, the third resistor R3, and the PNP transistor Q1 constitute the action circuit for the release of the discharge protection of the main circuit of a lithium-ion battery or a lithium-ion polymer battery. When the capacity of the lithium-ion battery or the lithium-ion polymer battery is higher than the discharge protection threshold voltage, the voltage detection module composed of the first resistor R1 and the Zener diode D1 detects the input voltage of the circuit. At this time, the Zener diode D1 undergoes Zener breakdown or avalanche breakdown at the normal voltage of the lithium-ion battery or the lithium-ion polymer battery; the PNP transistor Q1 is turned on because there is a reverse drive current. When the PNP transistor Q1 is turned on, the gate of the P-type MOS transistor Q2 in the main circuit is connected to the negative electrode GND of the lithium-ion battery or the lithium-ion polymer battery through the second resistor R2, the third resistor R3, and the PNP transistor Q1, forming a 0 voltage between the gate and the source of the P-type MOS transistor Q2 in the main circuit, thereby controlling the P-type MOS transistor Q2 to turn on, forming the release of the discharge protection for the battery, and the main circuit through the P-type MOS transistor Q2 can work normally, and the load and the power supply device can be normally powered at the output terminal Output.

[0044] The embodiment of the present application also provides an aerosol generating device, including a housing, an inner bracket, a main control circuit board, and an atomization component. The inner bracket is arranged inside the housing, the main control circuit board and the atomization component are installed on the inner bracket, and a protection circuit is arranged on the main control circuit board. The protection circuit adopts the battery over-discharge protection circuit as described above.

[0045] By providing the aerosol generating device adopting the battery over-discharge protection circuit as described above in this embodiment, it can effectively provide over-discharge protection for the lithium-ion battery or the lithium-ion polymer battery installed on the aerosol generating device.

[0046] Obviously, the embodiments described above are only a part of the embodiments of the present application, rather than all of them. The preferred embodiments of the present application are shown in the drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing specific embodiments, or perform equivalent replacements on some of the technical features. Any equivalent structure that makes use of the content of the specification and drawings of the present application, directly or indirectly applied in other related technical fields, is equally within the scope of patent protection of the present application.

Claims

1. A battery over-discharge protection circuit, characterized in that, The battery over-discharge protection circuit includes: a voltage detection module, a current control module, and an output module; One end of the voltage detection module is connected to the input terminal, and the other end is connected to the ground terminal. The input terminal and the ground terminal are respectively used to connect the positive electrode and the negative electrode of the battery. The voltage detection module is used to detect the battery capacity of the battery; One end of the current control module is connected to the voltage detection module. When the voltage corresponding to the battery capacity detected by the voltage detection module is lower than the preset discharge protection threshold voltage, the current control module is disconnected; The other end of the current control module is connected to the output module. One end of the output module is connected to the input terminal, and the other end is connected to the output terminal. The output module is used to control the disconnection of the path between the input terminal and the output terminal for discharge protection when the current control module is disconnected.

2. The battery over-discharge protection circuit according to claim 1, wherein The voltage detection module includes a first resistor and a Zener diode. The first resistor is connected to the input terminal, and the Zener diode is reversely connected between the first resistor and the ground terminal. The current control module is connected between the first resistor and the Zener diode.

3. The battery over-discharge protection circuit according to claim 2, wherein The current control module includes a second resistor, a third resistor, and a first transistor. The first transistor is connected to the Zener diode and is used to turn off when the Zener diode controls the circuit to be cut off or to turn on when the Zener diode breaks down. The second resistor is connected between the first transistor and the input terminal, and the third resistor is connected between the first transistor and the output module.

4. The battery over-discharge protection circuit according to claim 3, characterized in that, The first transistor is a PNP triode. The base of the PNP triode is connected to one end of the Zener diode. The emitter of the PNP triode is connected to the second resistor and the third resistor. The collector of the PNP triode is connected to the ground terminal.

5. The battery over-discharge protection circuit according to claim 4, characterized in that, The current control module further includes a filter capacitor. One end of the filter capacitor is connected to the output terminal, and the other end is connected to the collector of the PNP triode.

6. The battery over-discharge protection circuit according to claim 5, wherein, The filter capacitor is a multilayer ceramic capacitor.

7. The battery over-discharge protection circuit according to claim 5, wherein The output module includes a second transistor. One end of the second transistor is connected to the input terminal, and the other end is connected to the output terminal. It is used to control the conduction between the input terminal and the output terminal when the first transistor is turned on, or to control the disconnection between the input terminal and the output terminal when the first transistor is turned off.

8. The battery over-discharge protection circuit according to claim 7, wherein The second transistor is a P-type MOS transistor. The voltage detection module is connected to the gate of the P-type MOS transistor. The input terminal and the output terminal are respectively connected to the source and the drain of the P-type MOS transistor.

9. An aerosol generating device, characterized in that, The aerosol generating device adopts the battery over-discharge protection circuit according to any one of claims 1 to 8.

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