Self-adaptive battery charging circuit and electronic product

Abstract

The utility model provides a self-adaptive battery charging circuit and an electronic product. The self-adaptive battery charging circuit comprises a microcontroller, a charging management chip, an adjusting circuit and a detection circuit. The detection circuit collects a real-time voltage signal of the battery, detects whether the battery is in a charging state and generates a corresponding state signal; the microcontroller receives the voltage signal and the state signal output by the detection circuit, and outputs an adjusting signal when the state signal is a signal that the battery is in a charging state and a voltage value of the voltage signal is equal to a preset charging voltage value; the adjusting circuit is used for receiving the adjusting signal and adjusting the charging voltage of the charging management chip based on the signal value of the adjusting signal; and the charging management chip is used for charging the battery through the adjusted charging voltage. According to the utility model, when the microcontroller determines that the current charging voltage is not enough to fully charge the battery, the output voltage value of the charging management chip is changed through the adjusting circuit, so that the problem that the battery is not fully charged is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery charging technical field, especially a kind of self-adapting battery charging circuit and electronic product. BACKGROUND

[0002] The charging voltage of the battery in the existing electronic product with built-in battery is usually fixed, but the voltage of the battery produced by different manufacturers may be different, such as the full voltage of two lithium batteries in series may be 8.4V or 8.8V.

[0003] The existing charging circuit in the product cannot automatically adapt the charging voltage, and the battery may not be fully charged, affecting the use of the product. INVENTION CONTENTS

[0004] The main purpose of the utility model is to provide a self-adapting battery charging circuit, which aims to provide a charging circuit that automatically adapts the charging voltage, solves the problem of mismatch between the charging voltage and the battery, and the battery is not fully charged.

[0005] To achieve the above purpose, the self-adapting battery charging circuit provided by the utility model comprises a microcontroller, a charging management chip, an adjusting circuit and a detection circuit.

[0006] The detection circuit is connected to the battery and is used to collect the real-time voltage signal of the battery and detect whether the battery is in a charging state and generate a corresponding state signal.

[0007] The microcontroller is electrically connected to the detection circuit and is used to receive the voltage signal and state signal output by the detection circuit. When the state signal is a signal indicating that the battery is in a charging state and the voltage value of the voltage signal is equal to the preset charging voltage value, an adjusting signal is output.

[0008] The adjusting circuit is electrically connected to the microcontroller and the charging management chip, respectively, and is used to receive the adjusting signal and adjust the charging voltage of the charging management chip based on the signal value of the adjusting signal.

[0009] The charging management chip is connected to the battery and is used to charge the battery with the adjusted charging voltage.

[0010] Optionally, the adjusting circuit comprises a first resistor, a second resistor and a plurality of parallelly arranged impedance units.

[0011] The controlled ends of the plurality of parallelly arranged impedance units are connected to the plurality of control signal output ends of the microcontroller one by one.

[0012] The first end of the first resistor is connected to the battery, the second end is connected to the first end of the second resistor and the parameter setting end of the charge management chip; the second end of the second resistor is grounded;

[0013] The first end of the impedance unit is connected to the parameter setting end of the charge management chip and the first end of the second resistor, and the second end is grounded;

[0014] The impedance unit is configured to adjust the impedance value of the impedance unit based on the signal value of the control signal of the microcontroller after receiving the control signal, and change the voltage value at the parameter setting end.

[0015] Optionally, the impedance unit comprises a third resistor, a fourth resistor, a fifth resistor and a first triode;

[0016] The first end of the third resistor is connected to the parameter setting end of the charge management chip and the first end of the second resistor, and the second end is connected to the collector of the first triode; the emitter of the first triode is grounded, and the base is connected to the second end of the fourth resistor and the first end of the fifth resistor; the first end of the fourth resistor is connected to the control signal output end of the microcontroller for inputting the control signal; and the second end of the fifth resistor is grounded.

[0017] Optionally, the detection circuit comprises a voltage detection circuit and a current detection circuit;

[0018] The voltage detection circuit is connected to the battery and the microcontroller respectively, and is configured to detect the battery voltage of the battery and output the battery voltage to the microcontroller;

[0019] The current detection circuit is connected to the output end of the charge management chip and the microcontroller respectively, and is configured to detect the charging current output by the charge management chip to the battery and output the charging current to the microcontroller;

[0020] The microcontroller is configured to determine that the battery is in a charging state when the charging current value is greater than or equal to a current threshold value; and the microcontroller is further configured to determine that the battery is not in a charging state when the charging current value is less than the current threshold value.

[0021] Optionally, the voltage detection circuit comprises a sixth resistor to an eleventh resistor, a second triode and a first MOS tube;

[0022] The first end of the sixth resistor is connected with the output end of the charge management chip and the battery, the second end is connected with the gate of the first MOS tube and the first end of the seventh resistor; the second end of the seventh resistor is connected with the collector of the second triode; the emitter of the second triode is grounded, the first end of the eighth resistor is connected with the detection signal output end of the microcontroller, the second end is connected with the base of the second triode and the first end of the ninth resistor; the second end of the ninth resistor is grounded; the source of the first MOS tube is connected with the output end of the charge management chip, and the drain is connected with the first end of the tenth resistor; the second end of the tenth resistor is connected with the first end of the eleventh resistor and the voltage detection end of the microcontroller; the second end of the eleventh resistor is grounded.

[0023] Optionally, the current detection circuit comprises a twelfth resistor.

[0024] The twelfth resistor is arranged in the path between the output end of the charge management chip and the battery; the first end of the twelfth resistor is connected with the first current detection end of the microcontroller, and the second end is connected with the second current detection end of the microcontroller.

[0025] Optionally, the adaptive battery charging circuit further comprises an indication circuit.

[0026] The indication circuit is connected with the microcontroller.

[0027] The microcontroller is further configured to output an indication signal to the indication circuit when the state signal is a signal indicating that the battery is in a charging state and the voltage value of the voltage signal is equal to a preset charging voltage value.

[0028] The indication circuit is configured to perform an abnormality prompt when the indication signal is received.

[0029] Optionally, the indication circuit comprises a plurality of light emitting diodes.

[0030] The anode of the light emitting diode is connected with a first voltage, and the cathode is connected with the output end of the microcontroller.

[0031] The utility model further provides an electronic product, the electronic product includes a battery, and the adaptive electronic charging circuit.

[0032] The utility model provides a kind of adaptive battery charging circuit, and electronic product, the adaptive battery charging circuit includes: microcontroller, charging management chip, adjusting circuit and detection circuit;The detection circuit is connected with battery, for collecting the real-time voltage signal of battery and detecting whether battery is in charging state and generates corresponding state signal;The microcontroller is electrically connected with the detection circuit, for receiving the voltage signal and state signal output by the detection circuit, when the state signal is the signal that battery is in charging state and the voltage value of the voltage signal is equal to preset charging voltage value, output adjusting signal;The adjusting circuit is electrically connected with the microcontroller and charging management chip respectively, for receiving the adjusting signal, and the charging voltage of the charging management chip is adjusted based on the signal value of the adjusting signal;The charging management chip is connected with battery, for charging battery by the charging voltage after adjustment.The utility model uses microcontroller to change the output voltage value of charging management chip by adjusting circuit when determining that current charging voltage is not enough to fill battery, and the problem that charging voltage is less than battery full power is solved pertinently. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the structure shown in these drawings without creative labor for those skilled in the art.

[0034] Figure 1 It is the structural schematic diagram of the first embodiment of the adaptive battery charging circuit of the utility model.

[0035] Figure 2 It is the structural schematic diagram of the second embodiment of the adaptive battery charging circuit of the utility model.

[0036] Figure 3 It is the structural schematic diagram of the third embodiment of the adaptive battery charging circuit of the utility model.

[0037] Figure 4 It is the first structural schematic diagram of the fourth embodiment of the adaptive battery charging circuit of the utility model.

[0038] Figure 5 It is the second structural schematic diagram of the fourth embodiment of the adaptive battery charging circuit of the utility model.

[0039] EXPLANATION OF DRAWINGS:

[0040]

[0041] The purposes, functional features and advantages of the utility model will be further described in combination with embodiments with reference to the drawings. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0043] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications also change accordingly.

[0044] In the utility model, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0045] In addition, in the utility model, the description such as "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one feature. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that those skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0046] It should be noted that if the charging voltage is greater than or equal to the upper limit of the charging voltage of the battery, the battery can be charged to the upper limit of the charging voltage, and the battery is fully charged. However, if the charging voltage is less than the upper limit of the charging voltage of the battery, the battery can only be charged to a voltage value less than or equal to the charging voltage. In the prior art, the internal charging voltage of the battery in the electronic product is usually a fixed charging voltage, but the full voltage of the battery produced by different manufacturers may be different, such as the full voltage of two lithium batteries in series may be 8.4V or 8.8V. The charging voltage may be less than the full voltage of the battery, resulting in insufficient charging of the battery. When the charging voltage is less than the full voltage of the battery, the voltage value of the battery will not be greater than the charging voltage value; because the battery is not fully charged, the charging current is much larger than the full cutoff current.

[0047] The utility model provides a kind of self-adapting battery charging circuit, in the first embodiment of the utility model, as shown in Figure 1 The self-adapting battery charging circuit includes: microcontroller 40, charging management chip 10, adjusting circuit 20 and detection circuit 30.

[0048] The detection circuit 30 is connected with the battery, for collecting the real-time voltage signal of the battery and detecting whether the battery is in the charging state and generating the corresponding state signal.

[0049] The microcontroller 40 is electrically connected with the detection circuit 30, for receiving the voltage signal and state signal output by the detection circuit 30, when the state signal is the signal that the battery is in the charging state and the voltage value of the voltage signal is equal to the preset charging voltage value, output adjusting signal.

[0050] The adjusting circuit 20 is electrically connected with the microcontroller 40 and the charging management chip 10 respectively, for receiving the adjusting signal, and adjusting the charging voltage of the charging management chip 10 based on the signal value of the adjusting signal.

[0051] The charging management chip 10 is connected with the battery, for charging the battery through the adjusted charging voltage.

[0052] In the first embodiment, the detection circuit 30 collects the voltage signal of the battery and detects whether the battery is in the charging state. It should be noted that the charging management chip 10 is connected to the battery to provide a charging voltage for the battery. The charging current of the battery can be collected to determine the state of the battery in combination with the voltage signal of the battery. It is easy to understand that if the connection between the battery and the charging management chip 10 is disconnected or the battery is not in the charging state, the charging current of the battery is zero. If the charging voltage is greater than the real-time voltage of the battery and greater than the full voltage of the battery, the battery will be charged to the full voltage of the battery first, and then to the charging voltage value, which is easy to form an overshoot risk. If the charging voltage is greater than the real-time voltage of the battery and less than the full voltage of the battery, the battery will be charged to the charging voltage; when the battery is charged to the charging voltage, since the battery is not fully charged, there is still a charging current, and the charging current is greater than the cut-off charging current of the battery.

[0053] Specifically, the charging management chip 10 is connected to the battery to output a charging voltage to charge the battery; the detection circuit 30 can determine whether the battery is in the charging state by detecting the current value in the channel between the charging management chip 10 and the battery. It is easy to understand that when the battery is fully charged, the charging current is less than the cut-off charging current. The charging state of the battery can be determined by comparing the current value in the channel between the charging management chip 10 and the battery with the cut-off charging current value. The detection circuit 30 collects the real-time voltage signal of the battery and detects whether the battery is in the charging state and generates a corresponding state signal.

[0054] The microcontroller 40 receives the voltage signal and the state signal output by the detection circuit 30, and outputs an adjustment signal when the state signal is a signal indicating that the battery is in the charging state and the voltage signal is equal to the preset charging voltage.

[0055] It is easy to understand that in the battery charging scenario, the battery generally has a low power and needs to be charged. In the stage where the battery power is low and the charging voltage is greater than the battery voltage, the battery is charged under the action of the charging voltage, and the battery voltage rises. If the charging voltage is less than the full voltage of the battery, the battery voltage stops rising after rising to a voltage value equal to the preset charging voltage value; the preset charging voltage value is the voltage value of the charging voltage output by the charging management chip 10, which can be set by the developer. In particular, the preset voltage value can be adjusted in real time during the operation of the adaptive battery charging circuit based on the signal of the adjustment signal of the adjustment circuit 20, that is, the preset charging voltage value can be adjusted in real time during the operation of the circuit.

[0056] It should be noted that if the preset charging voltage value is less than the full voltage value of the battery, the battery voltage value is ultimately equal to the preset charging voltage value, at which time the charging current value is still greater than the charging cutoff current of the battery. Therefore, it can be determined that the battery is still in a charging state. The microcontroller 40 outputs an adjustment signal to the adjustment circuit 20.

[0057] If the preset charging voltage value is greater than the full voltage value of the battery, when the battery voltage approaches the full voltage value, the charging current is less than the charging cutoff current. In the prior art, when the charging current is less than the charging cutoff current, charging of the battery is stopped to prevent the battery from overcharging.

[0058] In order to avoid the charging voltage being lower than the full voltage of the battery, resulting in the battery not being fully charged, the microcontroller 40 outputs an adjustment signal when the state signal is a signal indicating that the battery is in a charging state and the voltage value of the voltage signal is equal to the preset charging voltage value.

[0059] The adjustment circuit 20 adjusts the charging voltage value output by the charging management chip 10 based on the signal value of the adjustment signal. It is easy to understand that the charging management chip 10 has a parameter setting end, and the charging management chip 10 outputs a corresponding charging voltage to the battery according to the voltage value at the parameter setting end. The adjustment circuit 20 adjusts the charging voltage output by the charging management chip 10 to the battery by changing the voltage value at the parameter setting end.

[0060] It should be noted that after adjustment by the adjustment circuit 20, the charging voltage value output by the charging management chip 10 becomes larger. The adjusted charging voltage is taken as a new preset charging voltage value, and the real-time voltage signal of the battery and the state signal of the battery are detected. It is determined whether the state signal is a signal indicating that the battery is in a charging state and whether the voltage value of the voltage signal of the battery is equal to the adjusted preset charging voltage value. If the state signal is a signal indicating that the battery is in a charging state and the voltage value of the voltage signal is equal to the preset charging voltage value, it means that the preset charging voltage value after this adjustment is less than the full voltage of the battery, which is insufficient to charge the battery to full capacity. The charging voltage of the charging management chip 10 needs to be adjusted again.

[0061] It is easy to understand that the battery can be fully charged only when the charging voltage output by the charging management chip 10 to the battery is greater than or equal to the full voltage of the battery. When the adjusted charging voltage is greater than the full voltage of the battery, the charging current is less than the charging cutoff current of the battery; when the detection circuit 30 detects that the charging current is less than the charging cutoff current of the battery, the detection circuit 30 outputs a signal that the battery is not in a charging state to the microcontroller 40. When the microcontroller 40 receives the signal that the battery is not in a charging state, the microcontroller 40 controls the charging management chip 10 to stop outputting the charging voltage through the adjusting circuit 20. The microcontroller 40 can be an MCU, a SOC or an FPGA controller.

[0062] The utility model provides a kind of self-adapting battery charging circuit, the self-adapting battery charging circuit includes: microcontroller 40, charging management chip 10, adjusting circuit 20 and detection circuit 30;The detection circuit 30 is connected with battery, for collecting the real-time voltage signal of battery and whether battery is in charging state and generates corresponding state signal;The microcontroller 40 is electrically connected with the detection circuit 30, for receiving the voltage signal and state signal output by the detection circuit 30, when the state signal is the signal that battery is in charging state and the voltage value of the voltage signal is equal to preset charging voltage value, output adjustment signal;The adjusting circuit 20 is electrically connected with the microcontroller 40 and charging management chip 10 respectively, for receiving the adjustment signal, and the charging voltage of the charging management chip 10 is adjusted based on the signal value of the adjustment signal;The charging management chip 10 is connected with battery, for charging battery by the charging voltage after adjustment. The utility model uses microcontroller 40, when battery is in charging state and the voltage value of voltage signal is equal to preset charging voltage value, changes the output voltage value of charging management chip 10 by adjusting circuit 20, and solves the problem that charging voltage is less than battery full voltage.

[0063] In the second embodiment of the utility model, the adjusting circuit 20 includes: first resistor R1, second resistor R2 and a plurality of parallelly arranged impedance units 210;

[0064] The controlled end of the plurality of parallelly arranged impedance units 210 is connected with the plurality of control signal output ends of the microcontroller 40 one by one;

[0065] The first end of the first resistor R1 is connected with battery, and the second end is connected with the first end of the second resistor R2 and the parameter setting end of the charging management chip 10;The second end of the second resistor R2 is grounded;

[0066] The first end of the impedance unit 210 is connected with the parameter setting end of the charging management chip 10 and the first end of the second resistor R2, and the second end is grounded;

[0067] The impedance unit 210 is configured to adjust the impedance value of the impedance unit 210 based on the signal value of the control signal of the microcontroller 40 after receiving the control signal, so as to change the voltage value at the parameter setting end.

[0068] It should be noted that, as shown in Figure 2 The first resistor R1 and the second resistor R2 constitute a resistor voltage dividing circuit, which divides the battery voltage and outputs the divided voltage to the parameter setting end of the charging management chip 10. The first end of the second resistor R2 is connected to the parameter setting end of the charging management chip 10, and the second end is grounded. The first end of the impedance unit 210 is connected to the parameter setting end of the charging management chip 10, and the second end is grounded. It can be easily understood that the impedance unit 210 is arranged in parallel with the second resistor R2. When the current flows through the impedance unit 210, the first resistor R1, the second resistor R2 and the impedance unit 210 in parallel constitute a voltage dividing circuit, and the voltage value at the parameter setting end of the charging management chip 10 is determined by the voltage dividing circuit. It can be easily understood that adjusting the impedance value of the impedance unit 210 can change the voltage value at the parameter setting end of the charging management chip 10.

[0069] The impedance unit 210 is configured to adjust the impedance value of the impedance unit 210 based on the signal value of the control signal of the microcontroller 40 after receiving the control signal, so as to change the voltage value at the parameter setting end.

[0070] In the third embodiment of the utility model, the impedance unit 210 includes: third resistor R3, fourth resistor R4, fifth resistor R5 and first triode T1;

[0071] The first end of the third resistor R3 is connected to the parameter setting end of the charging management chip 10 and the first end of the second resistor R2, and the second end is connected to the collector of the first triode T1. The emitter of the first triode T1 is grounded, and the base is connected to the second end of the fourth resistor R4 and the first end of the fifth resistor R5. The first end of the fourth resistor R4 is connected to the control signal output end of the microcontroller 40, and is configured to input the control signal. The second end of the fifth resistor R5 is grounded.

[0072] As shown in Figure 3As shown, the resistance voltage dividing circuit composed of the fourth resistor R4 and the fifth resistor R5 divides the control signal output from the control signal output end of the microcontroller 40, and outputs the divided control signal to the base of the first transistor T1. It should be noted that the first transistor T1 is an NPN transistor, and the impedance of the first transistor T1 is negatively related to the voltage value at the base. The fifth resistor R5 is a current limiting resistor. The microcontroller 40 can change the impedance value of the first transistor T1 by controlling the voltage value of the output control signal, thereby changing the impedance value of the impedance unit 210. It is easy to understand that when the first transistor T1 is turned on, the first transistor T1 and the fifth resistor R5 in the impedance unit 210 are connected in series and are connected in parallel with the second resistor R2.

[0073] In addition, it should be noted that the adjustment circuit 20 includes a plurality of impedance units 210 connected in parallel, and the microcontroller 40 can output corresponding control signals to the plurality of impedance units 210 respectively to finely adjust the voltage value at the parameter setting end of the charging management chip 10. The charging management chip 10 can be a BQ24610RGER chip, and correspondingly, the parameter setting end can be the VFB pin end of the BQ24610RGER chip.

[0074] It should be noted that the adjustment circuit 20 of the utility model includes a plurality of impedance units 210, and the circuit structures of the plurality of impedance units 210 can be consistent.

[0075] The detection circuit 30 needs to detect the real-time voltage signal of the battery and detect whether the battery is in a charging state. In the fourth embodiment of the utility model, the detection circuit 30 includes a voltage detection circuit 30 and a current detection circuit 30.

[0076] The voltage detection circuit 30 is connected to the battery and the microcontroller 40 respectively, and is used for detecting the battery voltage of the battery and outputting the battery voltage to the microcontroller 40.

[0077] The current detection circuit 30 is connected to the output end of the charging management chip 10 and the microcontroller 40 respectively, and is used for detecting the charging current output from the charging management chip 10 to the battery and outputting the charging current to the microcontroller 40.

[0078] The microcontroller 40 is used for determining that the battery is in a charging state when the charging current value is greater than or equal to a current threshold value. The microcontroller 40 is also used for determining that the battery is not in a charging state when the charging current value is less than the current threshold value.

[0079] It should be noted that the voltage detection circuit 30 is connected to the positive electrode of the battery, detects the voltage value of the battery, and outputs it to the microcontroller 40. In an example, as shown in Figure 4 The voltage detection circuit 30 includes a sixth resistor R6 to an eleventh resistor R11, a second triode T2, and a first MOS tube Q1.

[0080] The first end of the sixth resistor R6 is connected to the output end of the charge management chip 10 and the battery, and the second end is connected to the gate of the first MOS tube Q1 and the first end of the seventh resistor R7. The second end of the seventh resistor R7 is connected to the collector of the second triode T2. The emitter of the second triode T2 is grounded, the first end of the eighth resistor R8 is connected to the detection signal output end of the microcontroller 40, and the second end is connected to the base of the second triode T2 and the first end of the ninth resistor R9. The second end of the ninth resistor R9 is grounded. The source of the first MOS tube Q1 is connected to the output end of the charge management chip 10, and the drain is connected to the first end of the tenth resistor R10. The second end of the tenth resistor R10 is connected to the first end of the eleventh resistor R11 and the voltage detection end of the microcontroller 40. The second end of the eleventh resistor R11 is grounded.

[0081] It should be noted that the first end of the eighth resistor R8 is connected to the detection signal output end of the microcontroller 40; the resistance voltage dividing circuit composed of the eighth resistor R8 and the ninth resistor R9 divides the electrical signal output by the detection signal output end of the microcontroller 40, and the divided electrical signal is output to the base of the second triode T2; if the second triode T2 is turned on, the second end of the seventh resistor R7 is grounded, causing the voltage value at the gate of the first MOS tube Q1 to decrease. The first MOS tube Q1 is arranged between the output end of the charge management chip 10 and the tenth resistor R10; when the first MOS tube Q1 is turned on, the voltage of the battery is divided by the tenth resistor R10 and the eleventh resistor R11, and then output to the voltage detection end of the charge management chip 10.

[0082] The first MOS tube Q1 is a PMOS tube, and the second transistor T2 is an NPN transistor.When the detection signal output end of the microcontroller 40 outputs a high level, the second transistor T2 is turned on, the potential of the gate of the first MOS tube Q1 is pulled down, and the absolute value of the gate-source voltage of the first MOS tube Q1 is greater than the threshold voltage of the first MOS tube Q1; the first MOS tube Q1 is turned on, and the battery voltage is divided under the action of the tenth resistor R10 and the eleventh resistor R11, and the divided battery voltage is output to the voltage detection end of the microcontroller 40. When the detection signal output end of the microcontroller 40 outputs a low level, the second transistor T2 is cut off, the gate voltage of the first MOS tube Q1 is equal to the source voltage of the first MOS tube Q1, and the first MOS tube Q1 is cut off. The voltage detection end of the microcontroller 40 is grounded through the eleventh resistor R11. The voltage detection circuit 30 can also include a first capacitor, which is arranged in parallel with the eleventh resistor R11, for voltage stabilization.

[0083] The current detection circuit 30 includes a twelfth resistor R12; the twelfth resistor R12 is arranged in the path between the output end of the charging management chip 10 and the battery; the first end of the twelfth resistor R12 is connected to the first current detection end of the microcontroller 40, and the second end is connected to the second current detection end of the microcontroller 40. The twelfth resistor R12 is arranged in the path between the output end of the charging management chip 10 and the battery; in an embodiment of the utility model, the two ends of the twelfth resistor R12 are respectively connected to the first current detection end and the second current detection end of the microcontroller 40; the microcontroller 40 obtains the current value flowing through the twelfth resistor R12 by the voltage difference between the two ends of the twelfth resistor R12 and the resistance value of the twelfth resistor R12, that is, obtains the charging current value of the battery.

[0084] In another embodiment of the utility model, the two ends of the twelfth resistor R12 are respectively connected to the two current detection ends of the charging management chip 10, the charging management chip 10 compares the charging current of the battery with the current threshold value after obtaining the charging current of the battery, obtains the state of the battery based on the comparison result, and outputs the corresponding state signal to the microcontroller 40.

[0085] In order to facilitate the operator to know that the charging voltage and the battery do not match at the current time, and the battery is not fully charged. The fifth embodiment of the utility model is provided, and the self-adaptive battery charging circuit further comprises an indication circuit.

[0086] The indication circuit is connected to the microcontroller 40.

[0087] The microcontroller 40 is further configured to output an indication signal to the indication circuit when the state signal is a signal indicating that the battery is in a charging state and the voltage value of the voltage signal is equal to the preset charging voltage value.

[0088] The indication circuit is configured to perform an abnormality prompt when receiving the indication signal.

[0089] It should be noted that when the voltage value of the battery is equal to the preset charging voltage value, the voltage value of the battery is no longer increased under the action of the charging voltage. If the battery is in an uncharged state at this time, it indicates that the preset charging voltage value is equal to the full battery voltage value. If the battery is in a charging state at this time, it indicates that the preset charging voltage value is less than the full battery voltage value, i.e., the battery is not fully charged under the action of the preset charging voltage value.

[0090] The indication circuit performs an abnormality prompt after receiving the indication signal sent by the microcontroller 40. The indication circuit can include a light-emitting device or a sound-emitting device for prompting relevant personnel of the abnormality that the charging voltage at the current time does not match the battery.

[0091] In an example, the indication circuit includes a plurality of light-emitting diodes.

[0092] Anodes of the plurality of light-emitting diodes are connected to the first voltage, and cathodes of the plurality of light-emitting diodes are connected to the output end of the microcontroller 40.

[0093] It is easy to understand that the microcontroller 40 changes the potential at the cathode of the light-emitting diode to realize the light-emitting or extinguishing of the light-emitting diode. When the microcontroller 40 controls the cathode of the light-emitting diode to be at a low potential, the light-emitting diode emits light. When the microcontroller 40 controls the cathode of the light-emitting diode to be at a high potential, the light-emitting diode is extinguished. It should be noted that the microcontroller 40 can realize the indication of a plurality of working states through a plurality of light-emitting diodes. The number of light-emitting diodes in the plurality of light-emitting diodes that emit light and the combination of the emitted light can be used to determine the working state of the adaptive battery charging circuit, such as a normal working state and an abnormal working state. The first voltage can be provided by the microcontroller 40, the charging management chip 10, or a power module of a device in which the adaptive battery charging circuit is located.

[0094] The utility model also proposes an electronic product, the electronic product includes battery and adaptive battery charging circuit, the specific structure of adaptive battery charging circuit refers to the above embodiment, because the electronic product adopts all technical schemes of the above all examples, therefore at least has all beneficial effects brought by the technical scheme of the above example, here will not repeat.

[0095] The electronic product can be a radio frequency beauty instrument, an infusion pump, a syringe pump, an infusion workstation, a nutrition pump, or a video laryngoscope, etc.

[0096] The above is only optional embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation, direct / indirect application in other related technical fields under the inventive concept of the present application, or the contents of the present application specification and drawings are included in the patent protection scope of the present application.

Claims

1. An adaptive battery charging circuit, characterized in that, The adaptive battery charging circuit includes: a microcontroller, a charging management chip, an adjustment circuit, and a detection circuit; The detection circuit is connected to the battery and is used to collect the real-time voltage signal of the battery and detect whether the battery is in a charging state and generate a corresponding status signal. The microcontroller is electrically connected to the detection circuit and is used to receive the voltage signal and status signal output by the detection circuit. When the status signal indicates that the battery is in a charging state and the voltage value of the voltage signal is equal to the preset charging voltage value, the microcontroller outputs an adjustment signal. The adjustment circuit is electrically connected to the microcontroller and the charging management chip respectively, and is used to receive the adjustment signal and adjust the charging voltage of the charging management chip based on the signal value of the adjustment signal. The charging management chip is connected to the battery and is used to charge the battery using the adjusted charging voltage. The adjustment circuit includes: a first resistor, a second resistor, and multiple impedance units connected in parallel; The controlled terminals of the plurality of parallel impedance units are connected one-to-one to the plurality of control signal output terminals of the microcontroller. The first end of the first resistor is connected to the battery, and the second end is connected to the first end of the second resistor and the parameter setting terminal of the charging management chip; the second end of the second resistor is grounded. The first end of the impedance unit is connected to the parameter setting terminal of the charging management chip and the first end of the second resistor, and the second end is grounded; The impedance unit is used to adjust the impedance value of the impedance unit based on the signal value of the control signal after receiving the control signal from the microcontroller, thereby changing the voltage value at the parameter setting terminal.

2. The adaptive battery charging circuit as described in claim 1, characterized in that, The impedance unit includes: a third resistor, a fourth resistor, a fifth resistor, and a first transistor; The first end of the third resistor is connected to the parameter setting terminal of the charging management chip and the first end of the second resistor, and the second end is connected to the collector of the first transistor; the emitter of the first transistor is grounded, and the base is connected to the second end of the fourth resistor and the first end of the fifth resistor; the first end of the fourth resistor is connected to the control signal output terminal of the microcontroller for receiving control signals; the second end of the fifth resistor is grounded.

3. The adaptive battery charging circuit as described in any one of claims 1 to 2, characterized in that, The detection circuit includes: a voltage detection circuit and a current detection circuit; The voltage detection circuit is connected to the battery and the microcontroller respectively, and is used to detect the battery voltage of the battery and output it to the microcontroller; The current detection circuit is connected to the output terminal of the charging management chip and the microcontroller respectively, and is used to detect the charging current output by the charging management chip to the battery and output the charging current to the microcontroller. The microcontroller is used to determine that the battery is in a charging state when the charging current value is greater than or equal to the current threshold; the microcontroller is also used to determine that the battery is not in a charging state when the charging current value is less than the current threshold.

4. The adaptive battery charging circuit as described in claim 3, characterized in that, The voltage detection circuit includes: a sixth to an eleventh resistor, a second transistor, and a first MOSFET; The first end of the sixth resistor is connected to the output terminal of the charging management chip and the battery, and the second end is connected to the gate of the first MOS transistor and the first end of the seventh resistor; the second end of the seventh resistor is connected to the collector of the second transistor; the emitter of the second transistor is grounded; the first end of the eighth resistor is connected to the detection signal output terminal of the microcontroller, and the second end is connected to the base of the second transistor and the first end of the ninth resistor; the second end of the ninth resistor is grounded; the source of the first MOS transistor is connected to the output terminal of the charging management chip, and the drain is connected to the first end of the tenth resistor; the second end of the tenth resistor is connected to the first end of the eleventh resistor and the voltage detection terminal of the microcontroller; the second end of the eleventh resistor is grounded.

5. The adaptive battery charging circuit as described in claim 3, characterized in that, The current detection circuit includes: a twelfth resistor; The twelfth resistor is disposed in the path between the output terminal of the charging management chip and the battery; the first end of the twelfth resistor is connected to the first current detection terminal of the microcontroller, and the second end is connected to the second current detection terminal of the microcontroller.

6. The adaptive battery charging circuit as described in any one of claims 1 to 2, characterized in that, The adaptive battery charging circuit further includes: an indicator circuit; The indicator circuit is connected to the microcontroller; The microcontroller is further configured to output an indication signal to the indication circuit when the status signal is a signal that the battery is in a charging state and the voltage value of the voltage signal is equal to a preset charging voltage value; The indicator circuit is used to provide an abnormality alert when it receives the indicator signal.

7. The adaptive battery charging circuit as described in claim 6, characterized in that, The indicator circuit includes: multiple light-emitting diodes; The anode of the light-emitting diode is connected to a first voltage, and the cathode is connected to the output terminal of the microcontroller.

8. An electronic product, characterized in that, The electronic product includes a battery and an adaptive battery charging circuit as described in any one of claims 1 to 7.

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