Battery charging control circuit with dual protection

Abstract

The utility model discloses a battery charging control circuit with dual protection, which comprises a control chip and a first switch module, and the first switch module is connected with a battery and the control chip. The second switch module is connected with the battery through the first switch module, the second switch module is further connected with the charging source when the battery charging control circuit with the dual protection is connected with the charging source, and the second switch module is further connected with the control chip; and the first voltage dividing module is connected to a connecting circuit of the second switch module and the charging source, and the first voltage dividing module is further connected with the control chip. After the charging source is connected, the control chip controls the first switch module and the second switch module according to the received divided voltage output by the first voltage dividing module, when the first switch module and the second switch module are conducted, the charging source starts to charge the battery, a charging chip is not needed, and the cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery charging technical field especially, relate to a battery charging control circuit with double protection. BACKGROUND

[0002] With the improvement of battery service life and safety, more and more electronic products begin to use battery as power supply, and the battery is generally set as rechargeable battery, which is convenient for product use and improves user experience.

[0003] At present, when charging the battery, a switch module and a charging chip are generally used to complete charging, that is, when charging, the control chip in the charging circuit detects whether the input voltage is normal, and after the input voltage is normal, the control chip controls the switch module to be turned on, so that the charging chip inputs current, and then the charging chip starts charging the battery. Although the charging circuit can charge the battery, the cost of the charging circuit is high due to the high cost of the charging chip.

[0004] Therefore, the prior art still needs to be improved and developed. UTILITY MODEL CONTENTS

[0005] In view of the above problems of the prior art, the utility model aims at providing a battery charging control circuit with double protection to solve the problem of high cost of the charging circuit using the charging chip in the prior art.

[0006] The utility model provides a battery charging control circuit with double protection, which comprises a control chip, and further comprises:

[0007] A first switch module is connected with the battery and the control chip.

[0008] A second switch module is connected with the battery through the first switch module, and is further connected with a charging source when the battery charging control circuit with double protection is connected with the charging source.

[0009] A first voltage dividing module is connected to the connection path of the second switch module and the charging source, and is further connected with the control chip.

[0010] The control chip is used for receiving the voltage output by the first voltage dividing module, and controlling the first switch module and the second switch module according to the voltage.

[0011] The battery charging control circuit with double protection further comprises:

[0012] A charging protection chip for controlling the first switch module for secondary protection, the charging protection chip being connected with the first switch module.

[0013] The first switch module further comprises a first anti-static diode, a positive electrode of the first anti-static diode being connected with a source electrode of the first switch tube, and a negative electrode of the first anti-static diode being connected with a gate electrode of the first switch tube.

[0014] The gate electrode of the first switch tube is connected with one end of the first bootstrap capacitor, and the gate electrode of the first switch tube is also connected with one end of the first voltage dividing resistor; a drain electrode of the first switch tube is connected with the second switch module; a source electrode of the first switch tube is connected with the battery; and the source electrode of the first switch tube is also connected with the other end of the first voltage dividing resistor.

[0015] The other end of the first bootstrap capacitor is connected with one end of the second voltage dividing resistor; the other end of the second voltage dividing resistor is connected with one end of the third voltage dividing resistor; the other end of the third voltage dividing resistor is connected with the control chip; and the connection end of the second voltage dividing resistor and the third voltage dividing resistor is also connected with the charging protection chip.

[0016] The first anti-static diode has a breakdown voltage greater than a maximum voltage during discharge of the first bootstrap capacitor.

[0017] The second switch module further comprises a second anti-static diode, a positive electrode of the second anti-static diode being connected with a source electrode of the second switch tube, and a negative electrode of the second anti-static diode being connected with a gate electrode of the second switch tube.

[0018] The second switch module further comprises a second anti-static diode, a positive electrode of the second anti-static diode being connected with a source electrode of the second switch tube, and a negative electrode of the second anti-static diode being connected with a gate electrode of the second switch tube.

[0019] The drain electrode of the second switch tube is connected with the charging source when the charging source is connected; the gate electrode of the second switch tube is connected with one end of the fourth voltage dividing resistor and one end of the second bootstrap capacitor; the other end of the second bootstrap capacitor is connected with one end of the fifth voltage dividing resistor; the other end of the fifth voltage dividing resistor is connected with the control chip; the other end of the fourth voltage dividing resistor is connected to the source electrode of the second switch tube; and the source electrode of the second switch tube is also connected with the first switch module.

[0020] The further setting of the utility model discloses, the second switch module still includes the second anti -static diode, the positive pole of second anti -static diode is connected with the drain of second switch tube, the negative pole of second anti -static diode is connected with the grid of second switch tube.

[0021] The further setting of the utility model discloses, the breakdown voltage of second anti -static diode is greater than the maximum voltage when the second bootstrap voltage discharge.

[0022] The further setting of the utility model discloses, the second switch module still includes the first anti -reversal diode, the negative pole of first anti -reversal diode is connected with the drain of second switch tube, the positive pole of first anti -reversal diode is connected with the charging source when accessing charging source.

[0023] The further setting of the utility model discloses, the first voltage division module includes: sixth voltage division resistance, seventh voltage division resistance, eighth voltage division resistance, second anti -reversal diode, first bidirectional voltage stabilizing diode, first filter capacitor and third anti -static diode;

[0024] One end of first bidirectional voltage stabilizing diode and the positive pole of second anti -reversal diode are connected with the positive pole of first anti -reversal diode, and the other end of first bidirectional voltage stabilizing diode is grounded, and the negative pole of second anti -reversal diode is connected with one end of sixth voltage division resistance, and the other end of sixth voltage division resistance is connected with one end of seventh voltage division resistance and eighth voltage division resistance, and the other end of seventh voltage division resistance is grounded, and the other end of eighth voltage division resistance is connected with control chip, and one end of first filter capacitor and the negative pole of third anti -static diode are connected to the other end of eighth voltage division resistance, and the other end of first filter capacitor is grounded with the positive pole of third anti -static diode.

[0025] Beneficial effects

[0026] The utility model provides a kind of battery charging control circuit with double protection, the battery charging control circuit with double protection includes control chip;First switch module, the first switch module is connected with battery and the control chip;Second switch module, the second switch module is connected with the battery through the first switch module, the second switch module is also connected with the charging source when the battery charging control circuit with double protection is accessed charging source, the second switch module is also connected with the control chip;First voltage division module, the first voltage division module is connected on the connection road of the second switch module and the charging source, the first voltage division module is also connected with the control chip;Wherein, the control chip is used to receive the voltage division voltage output by the first voltage division module, and according to the voltage division voltage control the first switch module and the second switch module.In the technical scheme of the utility model, when charging battery, after accessing charging source, control chip controls first switch module and second switch module according to the voltage division voltage output by the first voltage division module received, wherein, when the first switch module and the second switch module are turned on, charging source starts charging battery, without charging chip, reduce cost. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in embodiment or prior art description, obviously, the drawings in the following description only some embodiments of the utility model, for ordinary person in the art, without creative labor, according to the structure shown in these drawings, other drawings can also be obtained.

[0028] Figure 1 It is the circuit structure diagram of the battery charging control circuit with double protection of the utility model.

[0029] Figure 2 It is the circuit structure diagram of charging battery using charging chip in prior art.

[0030] The labels in the attached diagram are as follows: 10, First switch module; 20, Second switch module; 30, Control chip; 40, Charging protection chip; 50, First voltage divider module; 60, Charging power source; Q1, First switching transistor; Q2, Second switching transistor; R1, First voltage divider resistor; R2, Second voltage divider resistor; R3, Third voltage divider resistor; R4, Fourth voltage divider resistor; R5, Fifth voltage divider resistor; R6, Sixth voltage divider resistor; R7, Seventh voltage divider resistor; R8, Eighth voltage divider resistor; C1, First bootstrap capacitor; C2, Second bootstrap capacitor; C3, First filter capacitor; DZ1, First anti-static diode; DZ2, Second anti-static diode; DZ3, Third anti-static diode; TVS1, First bidirectional Zener diode; D1, First reverse connection protection diode; D2, Second reverse connection protection diode; U1, Charging chip. Detailed Implementation

[0031] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0032] Currently, products using rechargeable batteries typically employ a switching module and a charging chip U1 for charging. Specifically, during charging, the control chip 30 in the charging circuit detects whether the applied voltage is normal. Once the applied voltage is normal, the control chip 30 controls the switching module to conduct, allowing current to flow into the charging chip U1, which then begins charging the battery. Although this charging circuit can charge the battery, the high cost of the charging chip U1 increases the overall cost of the charging circuit.

[0033] like Figure 2 As shown, this is a charging circuit using a charging chip U1. When the charging circuit is charging, after the charging source 60 is connected, the control chip 30 detects the voltage of the connected charging source 60. After the voltage of the connected charging source 60 is normal, the control chip 30 controls the third switch to turn on. At this time, the fourth switch turns on, and the current of the charging source 60 flows to the charging chip U1. After receiving the current flowing out of the charging source 60, the charging chip U1 starts to charge the battery.

[0034] Based on the above problems, the utility model provides a battery charging control circuit with double protection, as shown in the drawing, the battery charging control circuit with double protection can include control chip 30, first switch module 10, second switch module 20 and first voltage division module 50. Figure 1 As shown in the drawing, the battery charging control circuit with double protection can include control chip 30, first switch module 10, second switch module 20 and first voltage division module 50.

[0035] Among them, first switch module 10 is connected with battery and control chip 30;Second switch module 20 is connected with battery through first switch module 10, and is also connected with charging source 60 when the battery charging control circuit with double protection is connected with charging source 60, and is also connected with control chip 30;First voltage division module 50 is connected to the connection road of second switch module 20 and charging source 60, and is also connected with control chip 30;Control chip 30 is used to receive the voltage division voltage output by first voltage division module 50, and control first switch module 10 and second switch module 20 according to the voltage division voltage.

[0036] Specifically, first switch module 10 includes two states of off and on, and second switch module 20 also includes two states of off and on. When second switch module 20 is connected with charging source 60, if first switch module 10 and second switch module 20 are in the on state at the same time, charging source 60 is connected with the battery, and the battery charging starts.

[0037] Specifically, first switch module 10 includes two states of off and on, and second switch module 20 also includes two states of off and on. When second switch module 20 is connected with charging source 60, if first switch module 10 and second switch module 20 are in the on state at the same time, charging source 60 is connected with the battery, and the battery charging starts.

[0038] Therefore, the battery charging control circuit with double protection can charge the battery without charging chip U1, so that the cost is reduced, and the power consumption is reduced. In addition, the control chip 30 detects the voltage output by the connected charging source 60 after voltage division, which further improves the safety of the battery charging control circuit with double protection.

[0039] In this embodiment, the control chip may be, but is not limited to, a chip with the model number APT32F1029SSOP-24.

[0040] Furthermore, the battery charging control circuit with dual protection also includes a charging protection chip 40, which is used to control the first switch module 10 for secondary protection. The charging protection chip 40 is connected to the first switch module 10.

[0041] In this embodiment, when the battery charging control circuit with dual protection is charging, if there is an abnormality in the charging or if it is necessary to stop charging, the control chip 30 can control the first switch module 10 and / or the second switch module 20 to disconnect when the abnormality is detected. At this time, the charging source 60 stops charging, thus protecting the battery. In the event of an abnormality in the charging or if it is necessary to stop charging, the charging protection chip 40 can control the first switch module 10 to disconnect, and the charging source 60 will also stop charging.

[0042] It is evident that this battery charging control circuit with dual protection can meet the requirements of dual protection while reducing cost and power consumption.

[0043] In this embodiment, the charging protection chip may be, but is not limited to, a chip with the model number CM1270A.

[0044] In some embodiments, such as Figure 1 As shown, the first switching module 10 may include a first switching transistor Q1, a first bootstrap capacitor C1, a first voltage divider resistor R1, a second voltage divider resistor R2, and a third voltage divider resistor R3. The gate of the first switching transistor Q1 is connected to one end of the first bootstrap capacitor C1, and the gate of the first switching transistor Q1 is also connected to one end of the first voltage divider resistor R1. The drain of the first switching transistor Q1 is connected to the second switching module 20, and the source of the first switching transistor Q1 is connected to the battery. The source of the first switching transistor Q1 is also connected to the other end of the first voltage divider resistor R1. The other end of the first bootstrap capacitor C1 is connected to one end of the second voltage divider resistor R2, and the other end of the second voltage divider resistor R2 is connected to one end of the third voltage divider resistor R3. The other end of the third voltage divider resistor R3 is connected to the control chip 30, and the connection point between the second voltage divider resistor R2 and the third voltage divider resistor R3 is also connected to the charging protection chip 40.

[0045] Specifically, the first switch Q1 can be an N-MOS transistor (Metal-Oxide-Semiconductor).

[0046] In the embodiment, when the battery needs to be charged, the first switch tube Q1 is turned on by the control chip 30, and at the same time, the second switch module 20 is turned on by the control chip 30, at this time, the charging source 60 is connected with the battery, and the charging of the battery is started; when the control chip 30 detects an abnormality or needs to stop charging the battery, the first switch tube Q1 can be turned off by the control chip 30, and the first switch tube Q1 can also be turned off by the charging protection chip 40 when the charging is abnormal or needs to be stopped, at this time, the charging source 60 also stops charging.

[0047] It should be noted that whether the first switch tube Q1 is turned off by the control chip 30 or by the charging protection chip 40 needs to be set according to the actual situation, and will not be described in detail here.

[0048] In some embodiments, as shown in Figure 1 the first switch module 10 can further include a first anti-static diode DZ1, the positive electrode of the first anti-static diode DZ1 is connected with the source electrode of the first switch tube Q1, and the negative electrode of the first anti-static diode DZ1 is connected with the gate electrode of the first switch tube Q1.

[0049] In the embodiment, the first anti-static diode DZ1 can effectively protect the first switch tube Q1 from the influence of static electricity, and prolong the service life of the first switch tube Q1.

[0050] In some embodiments, the breakdown voltage of the first anti-static diode DZ1 is greater than the maximum voltage when the first bootstrap voltage discharge capacitor C1 discharges.

[0051] In the embodiment, since the breakdown voltage of the first anti-static diode DZ1 is greater than the maximum voltage when the first bootstrap voltage discharge capacitor C1 discharges, even when the first bootstrap voltage discharge capacitor C1 is fully charged and discharges, the first anti-static diode DZ1 will not be broken down.

[0052] In some embodiments, as shown in Figure 1 the second switch module 20 can include a second switch tube Q2, a fourth voltage dividing resistor R4, a fifth voltage dividing resistor R5, and a second bootstrap voltage discharge capacitor C2; the drain electrode of the second switch tube Q2 is connected with the charging source 60 when the charging source 60 is connected, the gate electrode of the second switch tube Q2 is connected with one end of the fourth voltage dividing resistor R4 and one end of the second bootstrap voltage discharge capacitor C2, the other end of the second bootstrap voltage discharge capacitor C2 is connected with one end of the fifth voltage dividing resistor R5, the other end of the fifth voltage dividing resistor R5 is connected with the control chip 30, the other end of the fourth voltage dividing resistor R4 is connected to the source electrode of the second switch tube Q2, and the source electrode of the second switch tube Q2 is also connected with the first switch module 10.

[0053] Specifically, the second switch Q2 can be an N-MOS transistor (Metal-Oxide-Semiconductor). The drain of the second switch Q2 is connected to the drain of the first switch Q1.

[0054] In this embodiment, when the battery needs to be charged, the control chip 30 controls the first switch Q1 to turn on, and at the same time, the control chip 30 controls the second switch Q2 to turn on. At this time, the charging source 60 is connected to the battery and starts charging the battery. When the control chip 30 detects an abnormality or needs to stop charging the battery, the control chip 30 can also control the second switch Q2 to turn off.

[0055] Furthermore, such as Figure 1 As shown, the second switch module 20 also includes a second anti-static diode DZ2. The positive terminal of the second anti-static diode DZ2 is connected to the drain of the second switch transistor Q2, and the negative terminal of the second anti-static diode DZ2 is connected to the gate of the second switch transistor Q2.

[0056] In this embodiment, the second anti-static diode DZ2 can effectively protect the second switching transistor Q2 from the effects of static electricity, thus extending the service life of the second switching transistor Q2.

[0057] Furthermore, the breakdown voltage of the second antistatic diode DZ2 is greater than the maximum voltage during the discharge of the second bootstrap voltage.

[0058] In this embodiment, since the breakdown voltage of the second anti-static diode is greater than the maximum voltage when the second bootstrap voltage is discharged, the second anti-static diode DZ2 will not be broken down even when the second bootstrap capacitor C2 is fully charged and discharged.

[0059] In some embodiments, such as Figure 1 As shown, the second switch module 20 also includes a first reverse connection protection diode D1. The negative terminal of the first reverse connection protection diode D1 is connected to the drain of the second switch transistor Q2, and the positive terminal of the first reverse connection protection diode D1 is connected to the charging power source 60 when the charging power source 60 is connected.

[0060] In some embodiments, the first voltage divider module 50 may include a sixth voltage divider resistor R6, a seventh voltage divider resistor R7, an eighth voltage divider resistor R8, a second reverse polarity protection diode D2, a first bidirectional Zener diode TVS1, a first filter capacitor C3, and a third anti-static diode DZ3.

[0061] The one end of the first bidirectional voltage stabilizing diode TVS1 and the positive pole of the second anti-reverse diode D2 are connected with the positive pole of the first anti-reverse diode D1, the other end of the first bidirectional voltage stabilizing diode TVS1 is grounded, the negative pole of the second anti-reverse diode D2 is connected with one end of the sixth voltage dividing resistor R6, the other end of the sixth voltage dividing resistor R6 is connected with one end of the seventh voltage dividing resistor R7 and the eighth voltage dividing resistor R8, the other end of the seventh voltage dividing resistor R7 is grounded, the other end of the eighth voltage dividing resistor R8 is connected with the control chip 30, one end of the first filter capacitor C3 and the negative pole of the third anti-static diode DZ3 are commonly connected to the other end of the eighth voltage dividing resistor R8, the other end of the first filter capacitor C3 and the positive pole of the third anti-static diode DZ3 are commonly grounded.

[0062] Specifically, the first bidirectional voltage stabilizing diode TVS1 is a bidirectional voltage stabilizing diode capable of preventing static electricity. When charging, the output voltage of the connected charging source 60 is divided into two paths at the connection end of the first anti-reverse diode D1 and the second anti-reverse diode D2, one of which is output to the second switch tube Q2 through the first anti-reverse diode D1, and the other is further divided into a voltage dividing voltage through the sixth voltage dividing resistor R6, the seventh voltage dividing resistor R7 and the eighth voltage dividing resistor R8, and then output to the control chip 30. When the received voltage dividing voltage in the control chip 30 is within the normal range (the voltage dividing voltage within the normal range means that the output voltage of the connected charging source 60 can charge the battery), the control chip 30 further controls the first switch tube Q1 and the second switch tube Q2 to be conductive according to the received voltage dividing voltage. At this time, the voltage output to the battery for charging through the second switch tube Q2 and the first switch tube Q1 after the voltage output to the second switch tube Q2 through the first anti-reverse diode D1.

[0063] In conclusion, the battery charging control circuit with double protection is provided, when charging, the second switch module 20 is connected to the charging source 60 first, after the charging source 60 is connected, the voltage output by the charging source 60 is two ways, one way is output to the second switch module 20, and the other way is output to the first voltage dividing module 50, the first voltage dividing module 50 outputs the voltage dividing voltage to the control chip 30, the control chip 30 controls the first switch module 10 and the second switch module 20 according to the received voltage dividing voltage after receiving the voltage dividing voltage, wherein, when the voltage dividing voltage received by the control chip 30 is in the normal range, the control chip 30 controls the first switch module 10 and the second switch module 20 to be in the conducting state, at this time, the charging source 60 is connected with the battery, and the battery charging is started, and when charging, the voltage output by the connected charging source 60 is detected after voltage dividing by the control chip 30, the first switch module 10 and the second switch module 20 are controlled to be conducted for charging when the voltage dividing voltage is normal; it can be seen that the battery charging control circuit with double protection can charge the battery without the charging chip U1, so that the cost is reduced, and the power consumption is reduced, in addition, the voltage output by the connected charging source 60 is detected after voltage dividing by the control chip 30, and the safety of the battery charging control circuit with double protection is further improved.

[0064] It can be understood that the above embodiments only express the preferred embodiments of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation of the utility model patent scope; it should be pointed out that, for ordinary skilled person in the art, the above technical features can be freely combined without departing from the concept of the utility model, and a plurality of variations and improvements can be made, which belong to the protection scope of the utility model; therefore, all equivalent transformations and modifications made in the utility model claim range should belong to the coverage of the utility model claim.

Claims

1. A battery charging control circuit with double protection, comprising a control chip, characterized in that, The battery charging control circuit with double protection further comprises: a first switch module connected with the battery and the control chip; a second switch module connected with the battery through the first switch module, connected with the charging source when the battery charging control circuit with double protection is connected with the charging source, and connected with the control chip; a first voltage dividing module connected to the connection path of the second switch module and the charging source, and connected with the control chip; wherein the control chip is configured to receive the voltage output by the first voltage dividing module and control the first switch module and the second switch module according to the voltage.

2. The battery charge control circuit with dual protection of claim 1, wherein, The battery charging control circuit with double protection further comprises: a charging protection chip for controlling the first switch module for secondary protection, and the charging protection chip is connected with the first switch module.

3. The battery charge control circuit with dual protection of claim 2, wherein, The first switch module comprises a first switch tube, a first bootstrap voltage boosting capacitor, a first voltage dividing resistor, a second voltage dividing resistor and a third voltage dividing resistor. The gate of the first switch tube is connected with one end of the first bootstrap voltage boosting capacitor, and the gate of the first switch tube is also connected with one end of the first voltage dividing resistor; the drain of the first switch tube is connected with the second switch module; the source of the first switch tube is connected with the battery and also connected with the other end of the first voltage dividing resistor; the other end of the first bootstrap voltage boosting capacitor is connected with one end of the second voltage dividing resistor; the other end of the second voltage dividing resistor is connected with one end of the third voltage dividing resistor; the other end of the third voltage dividing resistor is connected with the control chip; and the connection end of the second voltage dividing resistor and the third voltage dividing resistor is also connected with the charging protection chip. The first switch module further comprises a first anti-static diode, the anode of the first anti-static diode is connected with the source of the first switch tube, and the cathode of the first anti-static diode is connected with the gate of the first switch tube.

4. The battery charge control circuit with dual protection of claim 3, wherein, The breakdown voltage of the first anti-static diode is greater than the maximum voltage when the first bootstrap voltage boosting capacitor is discharged.

5. The battery charge control circuit with dual protection of claim 4, wherein, The second switch module comprises a second switch tube, a fourth voltage dividing resistor, a fifth voltage dividing resistor and a second bootstrap voltage boosting capacitor.

6. A battery charge control circuit with dual protection according to any one of claims 2-5, characterized in that, The drain of the second switch tube is connected with the charging source when the charging source is connected; the gate of the second switch tube is connected with one end of the fourth voltage dividing resistor and one end of the second bootstrap voltage boosting capacitor; the other end of the second bootstrap voltage boosting capacitor is connected with one end of the fifth voltage dividing resistor; the other end of the fifth voltage dividing resistor is connected with the control chip; the other end of the fourth voltage dividing resistor is connected with the source of the second switch tube; and the source of the second switch tube is also connected with the first switch module. The second switch module further comprises a second anti-static diode, the anode of the second anti-static diode is connected with the drain of the second switch tube, and the cathode of the second anti-static diode is connected with the gate of the second switch tube.

7. The battery charge control circuit with dual protection of claim 6, wherein, ​ 8. The battery charge control circuit with dual protection of claim 7, wherein, The breakdown voltage of the second anti-static diode is greater than the maximum voltage of the second bootstrap voltage when the second bootstrap voltage is discharged.

9. The battery charge control circuit with dual protection of claim 8, wherein, The second switch module further comprises a first anti-reverse connection diode, a negative electrode of the first anti-reverse connection diode is connected with a drain electrode of the second switch tube, and a positive electrode of the first anti-reverse connection diode is connected with the charging source when the charging source is connected.

10. The battery charge control circuit with dual protection of claim 9, wherein, The first voltage division module comprises a sixth voltage division resistor, a seventh voltage division resistor, an eighth voltage division resistor, a second anti-reverse connection diode, a first bidirectional voltage stabilizing diode, a first filter capacitor and a third anti-static diode. One end of the first bidirectional voltage stabilizing diode and the positive electrode of the second anti-reverse connection diode are connected with the positive electrode of the first anti-reverse connection diode, the other end of the first bidirectional voltage stabilizing diode is grounded, the negative electrode of the second anti-reverse connection diode is connected with one end of the sixth voltage division resistor, the other end of the sixth voltage division resistor is connected with one end of the seventh voltage division resistor and the eighth voltage division resistor, the other end of the seventh voltage division resistor is grounded, the other end of the eighth voltage division resistor is connected with the control chip, one end of the first filter capacitor and the negative electrode of the third anti-static diode are commonly connected to the other end of the eighth voltage division resistor, and the other end of the first filter capacitor and the positive electrode of the third anti-static diode are commonly grounded.

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