Battery electric quantity detection circuit and electronic atomization equipment

Abstract

The utility model provides a battery electric quantity detection circuit and an electronic atomization device, the battery electric quantity detection circuit comprises a charging circuit, a main control chip and a voltage sampling circuit, and the charging circuit comprises a charging management chip and a charging current adjusting resistor. According to the scheme, the battery is charged through the charging circuit, and when the electric quantity of the battery is detected in the charging process, the main control chip transmits the high-level signal to the charging current control end of the charging management chip, which is equivalent to increasing the resistance value of the charging current adjusting resistor of the charging management chip, so that the charging management chip stops charging the battery; after the preset time is delayed, the voltage sampling circuit samples the battery voltage to obtain a non-floating-charge sampling voltage, and the non-floating-charge sampling voltage is transmitted to the main control chip to obtain the battery electric quantity corresponding to the actual battery voltage, so that the accuracy of the electric quantity is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, and in particular to a battery power detection circuit and an electronic atomization device. Background Art

[0002] Electronic atomization equipment is used to atomize atomizing liquids such as water, liquid medicine, and atomizing oil for users to inhale. It is widely used because of its convenience and precise dosage control.

[0003] To save costs, conventional electronic atomizer devices typically don't include a fuel gauge. Instead, they typically determine the battery level by measuring the battery voltage during charging. However, during the charging process, there is a floating charge voltage. If this is used to calculate the battery level, the resulting value will be overstated, misleading the user. Therefore, it is necessary to design a detection solution that can improve the accuracy of battery level detection. Utility Model Content

[0004] The utility model provides a battery capacity detection circuit and an electronic atomization device, aiming to solve the problem of low accuracy in judging the battery capacity by using the battery voltage during the charging process in the related art.

[0005] In order to solve the above technical problems, the first aspect of the present invention provides a battery power detection circuit, including: a charging circuit, a main control chip, and a voltage sampling circuit. The charging circuit includes a charging management chip and a charging current regulating resistor; the charging current control end of the charging management chip is electrically connected to the charging current regulating resistor and the main control chip, respectively, the power input end of the charging management chip is electrically connected to the power supply, the output end of the charging management chip is used to be electrically connected to an external battery, and the voltage sampling circuit is electrically connected to the main control chip and is used to be electrically connected to the battery.

[0006] Furthermore, the voltage sampling circuit includes a first resistor and a second resistor, one end of the first resistor is used to be electrically connected to the battery, the other end of the first resistor is electrically connected to the main control chip and one end of the second resistor respectively, and the other end of the second resistor is grounded.

[0007] Furthermore, the voltage sampling circuit also includes a third resistor and a first capacitor, one end of the third resistor is electrically connected to the main control chip and one end of the first capacitor respectively, the other end of the third resistor is electrically connected to the other end of the first resistor, and the other end of the first capacitor is grounded.

[0008] Furthermore, the voltage sampling circuit also includes a switching circuit, a first end of the switching circuit is electrically connected to the other end of the first resistor, a second end of the switching circuit is electrically connected to the main control chip, and a third end of the switching circuit is electrically connected to the main control chip and one end of the second resistor respectively.

[0009] Furthermore, the switching circuit includes a switching tube, a fourth resistor and a fifth resistor, the first end of the switching tube is electrically connected to the other end of the first resistor, the second end of the switching tube is electrically connected to one end of the fourth resistor and the fifth resistor respectively, the third end of the switching tube is electrically connected to the main control chip and one end of the second resistor respectively, the other end of the fourth resistor is electrically connected to the main control chip, and the other end of the fifth resistor is grounded.

[0010] Furthermore, the charging circuit also includes a resistor voltage divider circuit, and the resistor voltage divider circuit is electrically connected to the power input terminal and the power supply of the charging management chip respectively.

[0011] Furthermore, the resistor divider circuit includes a sixth resistor and a seventh resistor, one end of the sixth resistor is electrically connected to the power input end of the charging management chip, the other end of the sixth resistor is electrically connected to one end of the seventh resistor and the power supply, and the other end of the seventh resistor is grounded.

[0012] Furthermore, the charging circuit also includes an eighth resistor and a second capacitor. The eighth resistor is electrically connected to the power input terminal of the charging management chip and one end of the second capacitor respectively, and the other end of the second capacitor is grounded.

[0013] Furthermore, the charging circuit also includes a ninth resistor and a third capacitor, one end of the ninth resistor is electrically connected to the charging status output end of the charging management chip, the other end of the ninth resistor is electrically connected to the main control chip, one end of the third capacitor is electrically connected to the output end of the charging management chip, and the other end of the third capacitor is grounded.

[0014] A second aspect of the present invention provides an electronic atomization device, comprising the battery power detection circuit as described in the first aspect of the present invention.

[0015] From the above description, it can be seen that the utility model charges the battery by the charging circuit. When the battery power is detected during the charging process, the main control chip transmits a high-level signal to the charging current control terminal of the charging management chip, which is equivalent to increasing the charging current regulating resistance so that the charging management chip stops charging the battery. After a preset delay time, the battery voltage is sampled by the voltage sampling circuit to obtain a sampling voltage without floating charge. The sampling voltage without floating charge is transmitted to the main control chip, and the battery power corresponding to the actual battery voltage can be obtained, thereby effectively improving the accuracy of the power. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of a battery power detection circuit according to an embodiment of the present utility model;

[0017] Figure 2 This is a circuit schematic diagram of a voltage sampling circuit according to an embodiment of the present utility model;

[0018] Figure 3 This is a circuit schematic diagram of another voltage sampling circuit according to an embodiment of the present utility model;

[0019] Figure 4 This is a circuit principle diagram of a charging circuit in an embodiment of the present utility model. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0021] In the related art, there is a problem of low accuracy in judging the battery power level using the battery voltage during the charging process. Therefore, an embodiment of the present utility model provides a battery power detection circuit.

[0022] like Figure 1 FIG2 is a schematic diagram of the structure of a battery power detection circuit provided by an embodiment of the present invention. The battery power detection circuit includes: a charging circuit 100, a main control chip 200, and a voltage sampling circuit 300. The charging circuit 100 includes a charging management chip 110 and a charging current regulating resistor 120. The charging current control terminal of the charging management chip 110 is electrically connected to the charging current regulating resistor 120 and the main control chip 200, respectively. The power input terminal of the charging management chip 110 is electrically connected to the power supply. The output terminal of the charging management chip 110 is used to be electrically connected to an external battery 400. The voltage sampling circuit 300 is electrically connected to the main control chip 200 and is used to be electrically connected to the battery 400.

[0023] Specifically, in this embodiment, the charging circuit 100 is used to charge the battery 400, and the charging current regulating resistor 120 can be used to adjust the size of the charging current. The larger the resistance of the charging current regulating resistor 120, the smaller the charging current, and the minimum is 0. The smaller the resistance of the charging current regulating resistor 120, the larger the charging current, and the maximum is the maximum current of the charging management chip 110. During normal charging, the pin connecting the main control chip 200 and the charging current control terminal of the charging management chip 110 is in a floating state. At this time, the charging current of the charging management chip 110 is affected by the resistance of the charging current regulating resistor 120. When charging needs to be turned off, the main control chip 200 outputs a high-level signal to the charging current control terminal of the charging management chip 110. At this time, the charging current control terminal of the charging management chip 110 is equivalent to connecting a resistor with a large resistance, so that its charging current is 0. After waiting for a preset period of time, the floating charge voltage will drop. At this time, the battery voltage is sampled through the voltage sampling circuit 300 to obtain the actual voltage without floating charge voltage. The actual voltage is transmitted to the main control chip 200, and the current battery capacity can be obtained. Therefore, by interrupting charging for a certain period of time during the charging process, the floating charge voltage is reduced and then the voltage is tested, so that the battery capacity can be obtained according to the accurate actual voltage, effectively improving the accuracy of the battery capacity and improving the user experience.

[0024] like Figure 2 FIG. 3 is a circuit diagram of a voltage sampling circuit 300 provided in this embodiment. Figure 2 The voltage sampling circuit 300 includes a first resistor R1 and a second resistor R2. One end of the first resistor R1 is used to be electrically connected to the battery, and the other end of the first resistor R1 is electrically connected to the main control chip 200 and one end of the second resistor R2 respectively. The other end of the second resistor R2 is grounded.

[0025] Further, see Figure 2 The voltage sampling circuit 300 also includes a third resistor R3 and a first capacitor C1. One end of the third resistor R3 is electrically connected to the main control chip 200 and one end of the first capacitor C1 respectively, the other end of the third resistor R3 is electrically connected to the other end of the first resistor R1, and the other end of the first capacitor C1 is grounded.

[0026] Specifically, in this embodiment, the first resistor R1 and the second resistor R2 are voltage-dividing resistors, the third resistor R3 is a current-limiting resistor, and the first capacitor C1 is a filter capacitor. The first resistor R1 and the second resistor R2 divide the battery voltage and transmit it to the main control chip 200, such as the analog-to-digital conversion port ADC of the MCU, so that the main control chip 200 detects the sampled voltage and outputs the battery power; the third resistor R3 is used to prevent excessive current from damaging components; the first capacitor C1 can filter the sampling signal so that the main control chip 200 receives a clean and stable sampling signal.

[0027] like Figure 3 FIG. 3 is a circuit diagram of another voltage sampling circuit 300 provided in this embodiment. Figure 3 The voltage sampling circuit 300 also includes a switching circuit, a first end of the switching circuit is electrically connected to the other end of the first resistor R1, a second end of the switching circuit is electrically connected to the main control chip 200, and a third end of the switching circuit is electrically connected to the main control chip 200 and one end of the second resistor R2 respectively.

[0028] Specifically, the switching circuit includes a switching tube Q1, a fourth resistor R4, and a fifth resistor R5. The first end of the switching tube Q1 is electrically connected to the other end of the first resistor R1, the second end of the switching tube Q1 is electrically connected to one end of the fourth resistor R4 and the fifth resistor R5, respectively, the third end of the switching tube Q1 is electrically connected to the main control chip 200 and one end of the second resistor R2, respectively, the other end of the fourth resistor R4 is electrically connected to the main control chip 200, and the other end of the fifth resistor R5 is grounded.

[0029] In this embodiment, in order to prevent the sampling circuit from consuming battery power when the battery voltage is not detected, a switch tube Q1 can be set in the sampling circuit. Figure 3 When not detecting battery voltage, the NMOS transistor in the main control chip 200 outputs a low-level signal, turning off the NMOS transistor, thereby reducing battery power loss. Furthermore, the fourth resistor R4 and the fifth resistor R5 in this embodiment are used to provide a bias voltage for the switch Q1 to ensure that the switch Q1 operates within its normal operating range. They also provide static protection, preventing electrostatic damage when the gate and source are in a high-impedance state, thereby ensuring device safety.

[0030] like Figure 4 The circuit diagram of a charging circuit 100 provided in this embodiment is shown in FIG. Figure 4 The charging circuit 100 further includes a resistor divider circuit, which is electrically connected to the power input terminal VIN of the charging management chip 110 (ie, U1) and the power supply. The power supply can be connected to the circuit through a USB interface.

[0031] Specifically, the resistor divider circuit includes a sixth resistor R6 and a seventh resistor R7. One end of the sixth resistor R6 is electrically connected to the power input terminal VIN of the charging management chip U1, and the other end of the sixth resistor R6 is electrically connected to one end of the seventh resistor R7 and the power supply respectively. The other end of the seventh resistor R7 is grounded.

[0032] Further, see Figure 4The charging circuit 100 further includes an eighth resistor R8 and a second capacitor C2. The eighth resistor R8 is electrically connected to the power input terminal VIN of the charging management chip U1 and one end of the second capacitor C2 respectively. The other end of the second capacitor C2 is grounded.

[0033] Further, see Figure 4 The charging circuit 100 further includes a ninth resistor R9 and a third capacitor C3. One end of the ninth resistor R9 is electrically connected to the charging status output terminal CHRG (also known as CHRG_FULL) of the charging management chip U1. The other end of the ninth resistor R9 is electrically connected to the main control chip 200. One end of the third capacitor C3 is electrically connected to the output terminal BAT of the charging management chip U1. The other end of the third capacitor C3 is grounded. Figure 4 The resistor R10 is a charging current regulating resistor 120, and the charging current control terminal of the charging management chip U1 is ISET (ie CHRG_EN).

[0034] In this embodiment, a resistor divider circuit is used to divide the voltage of an external power supply and transmit it to the power input terminal of the charge management chip U1 to provide a stable voltage for the chip, ensure that the charge management chip U1 operates within its allowable voltage range, and effectively limit current. In this embodiment, the eighth resistor R8 is used to limit current to prevent transient current from appearing at the power input terminal. The second capacitor C2 is used to filter out interference signals to ensure that the input voltage entering the charge management chip U1 is relatively stable. The third capacitor C3 is used for filtering to provide a stable charging voltage for the battery. The ninth resistor R9 is used to limit the current at the charge status output pin of the charge management chip U1. The charge status output terminal of the charge management chip U1 can be used to output a charging status signal, such as charging completion, to the main control chip 200, so that the main control chip 200 can regulate the charging process based on the charging status.

[0035] The battery power detection circuit provided by the embodiment of the present invention charges the battery by the charging circuit. When the battery power is detected during the charging process, the main control chip transmits a high-level signal to the charging current control terminal of the charging management chip, which is equivalent to increasing the charging current regulating resistance so that the charging management chip stops charging the battery. After the float charge voltage drops, the voltage sampling circuit samples the battery voltage, thereby obtaining a sampling voltage without float charge. The sampling voltage without float charge is transmitted to the main control chip, and the battery power corresponding to the actual battery voltage can be obtained, thereby effectively improving the accuracy of the power.

[0036] The present invention also provides an electronic atomization device including the battery charge detection circuit, wherein the electronic atomization device can be an electronic suction device, a medical atomizer, an air humidifier, or the like.

[0037] It should be noted that the various embodiments in the present invention are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other.

[0038] It should also be noted that, in the present invention, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further restrictions, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0039] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is intended to be applied in the widest possible manner consistent with the principles and novel features disclosed herein.

Claims

1. A battery power detection circuit, characterized in that: include: Charging circuit, main control chip, voltage sampling circuit, the charging circuit includes a charging management chip and a charging current regulating resistor; The charging current control end of the charging management chip is electrically connected to the charging current regulating resistor and the main control chip respectively, the power input end of the charging management chip is electrically connected to the power supply, the output end of the charging management chip is used to be electrically connected to an external battery, and the voltage sampling circuit is electrically connected to the main control chip and is used to be electrically connected to the battery.

2. The battery capacity detection circuit according to claim 1, characterized in that: The voltage sampling circuit includes a first resistor and a second resistor, one end of the first resistor is used to be electrically connected to the battery, the other end of the first resistor is electrically connected to the main control chip and one end of the second resistor respectively, and the other end of the second resistor is grounded.

3. The battery capacity detection circuit according to claim 2, characterized in that: The voltage sampling circuit also includes a third resistor and a first capacitor, one end of the third resistor is electrically connected to the main control chip and one end of the first capacitor respectively, the other end of the third resistor is electrically connected to the other end of the first resistor, and the other end of the first capacitor is grounded.

4. The battery capacity detection circuit according to claim 2, characterized in that: The voltage sampling circuit also includes a switching circuit, a first end of the switching circuit is electrically connected to the other end of the first resistor, a second end of the switching circuit is electrically connected to the main control chip, and a third end of the switching circuit is electrically connected to the main control chip and one end of the second resistor respectively.

5. The battery capacity detection circuit according to claim 4, characterized in that: The switching circuit includes a switching tube, a fourth resistor and a fifth resistor. The first end of the switching tube is electrically connected to the other end of the first resistor, the second end of the switching tube is electrically connected to one end of the fourth resistor and one end of the fifth resistor respectively, the third end of the switching tube is electrically connected to the main control chip and one end of the second resistor respectively, the other end of the fourth resistor is electrically connected to the main control chip, and the other end of the fifth resistor is grounded.

6. The battery capacity detection circuit according to claim 1, characterized in that: The charging circuit further includes a resistor voltage divider circuit, which is electrically connected to the power input terminal of the charging management chip and the power supply respectively.

7. The battery capacity detection circuit according to claim 6, characterized in that: The resistor divider circuit includes a sixth resistor and a seventh resistor, one end of the sixth resistor is electrically connected to the power input end of the charging management chip, the other end of the sixth resistor is electrically connected to one end of the seventh resistor and the power supply, and the other end of the seventh resistor is grounded.

8. The battery capacity detection circuit according to claim 1, characterized in that: The charging circuit further includes an eighth resistor and a second capacitor. The eighth resistor is electrically connected to the power input terminal of the charging management chip and one end of the second capacitor, respectively. The other end of the second capacitor is grounded.

9. The battery capacity detection circuit according to claim 1, characterized in that: The charging circuit also includes a ninth resistor and a third capacitor, one end of the ninth resistor is electrically connected to the charging status output end of the charging management chip, the other end of the ninth resistor is electrically connected to the main control chip, one end of the third capacitor is electrically connected to the output end of the charging management chip, and the other end of the third capacitor is grounded.

10. An electronic atomization device, characterized in that: The method comprises the battery capacity detection circuit according to any one of claims 1 to 9.

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