BMS button activation circuit and portable electronic device

Abstract

The present disclosure provides a BMS button activation circuit and a portable electronic device, the circuit includes a button input circuit, a button enable circuit and a power control circuit, the button input circuit includes a first resistor, a common diode and a control switch, the button enable circuit includes a second resistor, a third resistor, a fourth resistor, a fifth resistor and a first triode, and the power control circuit includes a sixth resistor, a seventh resistor, an eighth resistor, an isolator, a first voltage stabilizing capacitor and a second voltage stabilizing capacitor. When there is a user's button operation, the activation button enable circuit is energized, and after the activation signal is transmitted to the analog front end, the power control circuit is operated, so that the power control circuit supplies power to the control unit, and then the circuit can quickly respond to the button operation; when the battery cell voltage is lower than a certain value, the enable end of the control unit sends a power-off signal, disconnects the isolator, and the power control circuit no longer works, so that the power consumption of the circuit in the standby state is extremely low.

Description

Technical Field

[0001] The present disclosure relates to the fields of battery technology and electronic hardware technology, and in particular to a BMS button activation circuit and a portable electronic device. Background Art

[0002] With the popularity of portable electronic devices, battery management systems (hereinafter referred to as BMS) are increasingly being used. BMS systems usually need to monitor battery charging and discharging status, voltage, current, temperature and other parameters to ensure safe operation of the battery and extend its service life.

[0003] At present, the traditional BMS system still consumes a certain amount of power in standby mode, which will shorten the battery life for portable electronic devices that need to standby for a long time. These problems are reflected in the following two aspects:

[0004] 1. Standby power consumption: Traditional BMS systems will have a certain current consumption even in standby mode. This is because some components in the system (such as control unit MCU, analog front end AEF, etc.) may need to maintain power supply to maintain the monitoring function of the system.

[0005] 2. Battery life: For devices that require long standby time (such as handheld devices, camera batteries, etc.), the high standby power consumption will continuously consume battery power, thereby shortening the use time of the device. Utility Model Content

[0006] The purpose of the present disclosure is to overcome the deficiencies in the prior art and to provide a BMS key activation circuit and a portable electronic device that can achieve fast key activation and low power consumption.

[0007] The purpose of this disclosure is achieved through the following technical solutions:

[0008] A BMS button activation circuit, comprising:

[0009] A key input circuit includes a first resistor, a common diode and a control switch, wherein a first end of the first resistor is used to connect to a standard power supply, a second end of the first resistor is used to connect to a switch control end of a control unit, the second end of the first resistor is also connected to an anode of the common diode, a cathode of the common diode is connected to a first end of the control switch, and a second end of the control switch is grounded;

[0010] A key enabling circuit comprises a second resistor, a third resistor, a fourth resistor, a fifth resistor and a first transistor, wherein a first end of the second resistor is connected to a first end of the control switch, a second end of the second resistor is respectively connected to a first end of the third resistor and a control end of the first transistor, a second end of the third resistor is connected to a controllable power supply, a first end of the first transistor is connected to a second end of the third resistor, a second end of the first transistor is connected to a first end of the fourth resistor, a second end of the fourth resistor is connected to a first end of the fifth resistor, a first end of the fifth resistor is also used to connect to an output end of an analog front end, and a second end of the fifth resistor is grounded;

[0011] A power control circuit comprises a sixth resistor, a seventh resistor, an eighth resistor, an isolator, a first voltage-stabilizing capacitor and a second voltage-stabilizing capacitor, wherein the first end of the sixth resistor is connected to the enable end of the control unit, the second end of the sixth resistor is connected to the third end of the isolator, the third end of the isolator is also connected to the wake-up end of the analog front end, the first end of the isolator is respectively connected to the first end of the seventh resistor and the upper half end of the first voltage-stabilizing capacitor, the lower half end of the first voltage-stabilizing capacitor is grounded, the second end of the seventh resistor is connected to a controllable power supply, the second end of the isolator is grounded, the fifth end of the isolator is respectively connected to the first end of the eighth resistor and the upper half end of the second voltage-stabilizing capacitor, the lower half end of the second voltage-stabilizing capacitor is grounded, and the second end of the eighth resistor is connected to a standard power supply.

[0012] In one embodiment, the key enable circuit further includes a second transistor, a first end of the second transistor is connected to the first end of the fourth resistor, a control end of the second transistor is connected to the second end of the fourth resistor, and a second end of the second transistor is connected to the first end of the fifth resistor.

[0013] In one embodiment, the key enabling circuit further includes a third voltage stabilizing capacitor, an upper half of the third voltage stabilizing capacitor is connected to the first end of the second transistor, and a lower half of the third voltage stabilizing capacitor is connected to the second end of the second transistor.

[0014] In one embodiment, the key enable circuit also includes a ninth resistor and a first voltage-stabilizing diode, the anode of the first voltage-stabilizing diode is connected to the second end of the fifth resistor, the cathode of the first voltage-stabilizing diode is respectively connected to the first end of the ninth resistor and the second end of the fourth resistor, and the second end of the ninth resistor is connected to the first end of the fifth resistor.

[0015] In one embodiment, the power control circuit further includes a tenth resistor, and the fifth terminal of the isolator is connected to the third terminal of the isolator through the tenth resistor.

[0016] In one embodiment, the power supply control circuit also includes a second zener diode and a bidirectional zener diode, the anode of the second zener diode is connected to the lower half of the first zener capacitor, and the cathode of the second zener diode is connected to the first end of the seventh resistor; the first end of the bidirectional zener diode is connected to the first end of the eighth resistor, and the second end of the bidirectional zener diode is connected to the lower half of the second zener capacitor.

[0017] In one embodiment, the BMS button activation circuit also includes a power supply circuit, including an eleventh resistor, a twelfth resistor, a third transistor and a fourth voltage-stabilizing capacitor, the first end of the eleventh resistor is connected to the positive battery terminal of the analog front end, the second end of the eleventh resistor is respectively connected to the first end of the twelfth resistor and the control end of the third transistor, the second end of the twelfth resistor is connected to the first end of the third transistor, the second end of the third transistor is connected to a controllable power supply, the upper half of the fourth voltage-stabilizing capacitor is connected to the second end of the third transistor, and the lower half of the fourth voltage-stabilizing capacitor is connected to the control end of the third transistor.

[0018] In one embodiment, the power supply circuit also includes a fourth transistor, the first end of the fourth transistor is connected to the first end of the twelfth resistor, the second end of the fourth transistor is connected to the control end of the third transistor, and the control end of the fourth transistor is connected to the lower half of the fourth voltage-stabilizing capacitor.

[0019] In one embodiment, the power supply circuit further includes a thirteenth resistor and a fourteenth resistor, the first end of the fourth transistor is connected to the first end of the twelfth resistor through the thirteenth resistor, the control end of the fourth transistor is connected to the first end of the fourteenth resistor, and the second end of the fourteenth resistor is connected to the first end of the twelfth resistor.

[0020] In one embodiment, the power supply circuit also includes a third voltage-stabilizing diode and a fifth voltage-stabilizing capacitor, the upper half of the fifth voltage-stabilizing capacitor is connected to the second end of the fourteenth resistor, the lower half of the fifth voltage-stabilizing capacitor is respectively connected to the anode of the third voltage-stabilizing diode and the lower half of the fourth voltage-stabilizing capacitor, and the cathode of the third voltage-stabilizing diode is connected to the control end of the fourth transistor.

[0021] A portable electronic device comprises the BMS button activation circuit described in any one of the above embodiments.

[0022] Compared with the prior art, the present invention has at least the following advantages:

[0023] 1. To start the battery management system BMS, the user only needs to press the control switch to activate it. When there is a user button operation, the activation button enable circuit will be energized. After the activation signal is transmitted to the analog front end, the power control circuit will work, so that the power control circuit supplies power to the control unit. Furthermore, the BMS button activation circuit can respond quickly to button operations and is easy to implement, ensuring the user's operating experience.

[0024] 2. When the cell voltage is lower than a certain value, the enable end of the control unit sends a power-off signal to disconnect the isolator, so that the power control circuit no longer works and the BMS is put into sleep mode. As a result, the power consumption of the BMS button activation circuit in standby mode is extremely low, effectively extending the battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A partial circuit diagram of a BMS button activation circuit in an embodiment, the circuit diagram showing a button input circuit and a control unit;

[0027] Figure 2 A circuit diagram of a key enabling circuit of a BMS key activation circuit in an embodiment;

[0028] Figure 3 A circuit diagram of a power control circuit of a BMS button activation circuit in an embodiment;

[0029] Figure 4 A circuit diagram of an analog front end of a BMS button activation circuit in one embodiment;

[0030] Figure 5 FIG. 4 is a circuit diagram of a power supply circuit of a BMS button activation circuit in an embodiment.

[0031] Figure numerals: 10, BMS button activation circuit; 100, button input circuit; 200, button enable circuit; 300, power control circuit; 400, control unit; 500, analog front end; 600, power supply circuit; R190, first resistor; R106, second resistor; R102, third resistor; RK2, fourth resistor; RA14, fifth resistor; R184, sixth resistor; R155, seventh resistor; R22, eighth resistor; RA10, ninth resistor; R144, tenth resistor; R52, eleventh resistor; R53, twelfth resistor Resistor; R60, the thirteenth resistor; R63, the fourteenth resistor; SW1, the control switch; QK3, the first transistor; QK2, the second transistor; Q7, the third transistor; Q9, the fourth transistor; UP5, the isolator; C163, the first voltage-stabilizing capacitor; CP20, the second voltage-stabilizing capacitor; CK2, the third voltage-stabilizing capacitor; C54, the fourth voltage-stabilizing capacitor; C55, the fifth voltage-stabilizing capacitor; DP1, the ordinary diode; ZA1, the first voltage-stabilizing diode; DZ5, the second voltage-stabilizing diode; D34, the bidirectional voltage-stabilizing diode; D60, the third voltage-stabilizing diode. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0033] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0035] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0036] See also Figures 1 to 4, which is a BMS button activation circuit 10 of an embodiment of the utility model, includes a button input circuit 100, a button enable circuit 200 and a power control circuit 300, wherein the button input circuit 100 is used to receive a user's button operation signal; the button enable circuit 200 is used to generate a pulse activation signal when a valid button operation is detected; the power control circuit 300 is used to supply power to the control unit 400.

[0037] like Figure 1 As shown, the key input circuit 100 includes a first resistor R190, a common diode DP1 and a control switch SW1. The first end of the first resistor R190 is used to connect to a standard power supply, the second end of the first resistor R190 is used to connect to a switch control end of the control unit 400, the second end of the first resistor R190 is also connected to the anode of the common diode DP1, the cathode of the common diode DP1 is connected to the first end of the control switch SW1, and the second end of the control switch SW1 is grounded.

[0038] like Figure 2 As shown, the key enabling circuit 200 includes a second resistor R106, a third resistor R102, a fourth resistor RK2, a fifth resistor RA14 and a first transistor QK3, the first end of the second resistor R106 is connected to the first end of the control switch SW1, the second end of the second resistor R106 is respectively connected to the first end of the third resistor R102 and the control end of the first transistor QK3, the second end of the third resistor R102 is connected to the controllable power supply, the first end of the first transistor QK3 is connected to the second end of the third resistor R102, the second end of the first transistor QK3 is connected to the first end of the fourth resistor RK2, the second end of the fourth resistor RK2 is connected to the first end of the fifth resistor RA14, the first end of the fifth resistor RA14 is also used to connect to the output end of the analog front end 500, and the second end of the fifth resistor RA14 is grounded.

[0039] like Figure 3 As shown, the power control circuit 300 includes a sixth resistor R184, a seventh resistor R155, an eighth resistor R22, an isolator UP5, a first voltage-stabilizing capacitor C163 and a second voltage-stabilizing capacitor CP20. The first end of the sixth resistor R184 is connected to the enable end SELF_POWERDOWN of the control unit 400, the second end of the sixth resistor R184 is connected to the third end of the isolator UP5, the third end of the isolator UP5 is also connected to the wake-up end REGOUT of the analog front end 500, the first end of the isolator UP5 is respectively connected to the first end of the seventh resistor R155 and the upper half end of the first voltage-stabilizing capacitor C163, the lower half end of the first voltage-stabilizing capacitor C163 is grounded, the second end of the seventh resistor R155 is connected to the controllable power supply, the second end of the isolator UP5 is grounded, the fifth end of the isolator UP5 is respectively connected to the first end of the eighth resistor R22 and the upper half end of the second voltage-stabilizing capacitor CP20, the lower half end of the second voltage-stabilizing capacitor CP20 is grounded, and the second end of the eighth resistor R22 is connected to the standard power supply.

[0040] In this embodiment, the battery management system BMS can be started by the user simply pressing the control switch SW1. When there is a user button operation, the activation button enable circuit 200 is energized. After the activation signal is transmitted to the analog front end 500, the power control circuit 300 is operated, so that the power control circuit 300 supplies power to the control unit 400. Furthermore, the BMS button activation circuit 10 can respond to the button operation quickly and is easy to implement, thereby ensuring the user's operating experience. In addition, when the battery cell voltage is lower than a certain value, the enable terminal SELF_POWERDOWN of the control unit 400 sends a power-off signal to disconnect the isolator UP5, so that the power control circuit 300 no longer works to sleep the BMS, so that the power consumption of the BMS button activation circuit 10 is extremely low, which effectively extends the battery life.

[0041] Understandably, combined Figures 1 to 4 As shown, when it is necessary to activate the BMS to make the electronic device work, the user only needs to activate the control switch SW1 by pressing a button. At this time, after the button enabling circuit 200 receives the button operation signal, the current of the controllable power supply passes through the second resistor R106, the third resistor R102 and the control switch SW1 in sequence and then is grounded. The second resistor R106 and the third resistor R102 are divided by voltage to turn on the first transistor QK3. Subsequently, the activation signal passes through the fourth resistor RK2 and reaches the analog front end 500. At this time, the analog front end 500 receives the activation signal and sends the activation signal to the power control circuit 300. The activation signal reaches the isolator UP5 through the wake-up terminal REGOUT of the analog front end 500 to turn on the isolator UP5. At this time, the power control circuit 300 is awakened to activate the BMS to make the electronic device work. The power control circuit 300 supplies power to the control unit 400, and the control unit 400 outputs an automatic The lock signal enables the power control circuit 300. During this period, the first voltage-stabilizing capacitor C163 is used to store the voltage of the controllable power supply to stabilize the voltage. The second capacitor is used to store the output voltage to stabilize the output voltage and reduce the possibility of voltage fluctuations. When the cell voltage in the electronic device is lower than a certain value, the enable terminal SELF_POWERDOWN of the control unit 400 sends a power-off signal to shut down the BMS in a suicide manner. The third terminal of the isolator UP5 compares the voltage of the enable terminal SELF_POWERDOWN with the voltage of the wake-up terminal REGOUT. Subsequently, after comparing the third terminal of the isolator UP5 with the first terminal, the fifth terminal of the isolator UP5 outputs a low level to shut down the isolator UP5 to stop the power control circuit 300 from working. The analog front end 500 and the control unit 400 no longer work and enter the standby mode. The power consumption of the BMS button activation circuit 10 in the standby mode is extremely low.

[0042] Furthermore, the first transistor QK3 is a PNP transistor, a first end of which is an emitter, a second end of which is a collector, and a control end of which is a base.

[0043] Furthermore, the first end of the isolator UP5 is a voltage input end for connecting the voltage of the controllable power supply, the second end is a ground end, and the third end is a comparison end for comparing the voltage of the enable end SELF_POWERDOWN of the control unit 400 and the voltage of the wake-up end REGOUT of the analog front end 500, so as to determine whether the fifth end of the isolator UP5 is turned on or not by comparing the corresponding levels of the outputs of the first end and the third end of the isolator UP5, that is, the fifth end of the isolator UP5 is a level output end, and the fourth end of the isolator UP5 is an empty pin port.

[0044] like Figure 2 As shown, in one embodiment, the key enable circuit 200 further includes a second triode QK2, a first terminal of the second triode QK2 is connected to a first terminal of a fourth resistor RK2, a control terminal of the second triode QK2 is connected to a second terminal of the fourth resistor RK2, and a second terminal of the second triode QK2 is connected to a first terminal of a fifth resistor RA14. It can be understood that when the user performs a key operation, the activation signal passes through the key enable circuit 200 to turn on the first triode QK3. At this time, the fourth resistor RK2 is connected between the second terminal of the first triode QK3 and the control terminal of the second triode QK2 to turn on the second triode QK2. Then, the activation signal reaches the analog front end 500 to start powering the power control circuit 300. When the key operation is completed, the level of the activation signal is pulled down to turn off the first triode QK3, and the second triode QK2 cannot be turned on, so that the key enable circuit 200 stops working, and then the power control circuit 300 works normally.

[0045] like Figure 2 As shown, in one embodiment, the key enabling circuit 200 further includes a third voltage stabilizing capacitor CK2, the upper half of the third voltage stabilizing capacitor CK2 is connected to the first end of the second transistor QK2, and the lower half of the third voltage stabilizing capacitor CK2 is connected to the second end of the second transistor QK2. It can be understood that since the third voltage stabilizing capacitor CK2 is connected in parallel with the fourth resistor RK2, it can filter the activation signal, reduce the interference of redundant signals, and stabilize the first end and the second end of the second transistor QK2, reducing the voltage fluctuation.

[0046] Furthermore, the second transistor QK2 is an NPN transistor, a first end of which is a collector, a second end of which is an emitter, and a control end of which is a base.

[0047] like Figure 2As shown, in one embodiment, the key enable circuit 200 further includes a ninth resistor RA10 and a first voltage zener diode ZA1, the anode of the first voltage zener diode ZA1 is connected to the second end of the fifth resistor RA14, the cathode of the first voltage zener diode ZA1 is respectively connected to the first end of the ninth resistor RA10 and the second end of the fourth resistor RK2, and the second end of the ninth resistor RA10 is connected to the first end of the fifth resistor RA14. It can be understood that the first voltage zener diode ZA1 is connected in parallel with the fifth resistor RA14 to stabilize the voltage of each component of the key enable circuit 200 and avoid voltage fluctuations. The setting of the ninth resistor RA10 can further protect the voltage zener diode and avoid the situation where the voltage zener diode is broken down due to a large current.

[0048] Furthermore, the key enable circuit 200 is usually equipped with several general diodes to ensure the unidirectional conduction of current and avoid damage to circuit components due to current backflow. Several resistors are set to further protect several transistors, general diodes (D4, D12, D50, D51, D53, etc.) and the first voltage regulator diode ZA1 to avoid the above-mentioned components being damaged by large current breakdown.

[0049] like Figure 3 As shown, in one embodiment, the power control circuit 300 further includes a tenth resistor R144, and the fifth terminal of the isolator UP5 is connected to the third terminal of the isolator UP5 through the tenth resistor R144. It can be understood that after the fifth terminal of the isolator UP5 outputs a level, the current will also flow back to the third terminal of the isolator UP5 through the tenth resistor R144, so as to compare the current voltage with the voltage of the enable terminal SELF_POWERDOWN of the control unit 400 to determine whether the isolator UP5 is turned on or off.

[0050] like Figure 3As shown, in one embodiment, the power control circuit 300 also includes a second zener diode DZ5 and a bidirectional zener diode D34, the anode of the second zener diode DZ5 is connected to the lower half end of the first zener capacitor C163, and the cathode of the second zener diode DZ5 is connected to the first end of the seventh resistor R155; the first end of the bidirectional zener diode D34 is connected to the first end of the eighth resistor R22, and the second end of the bidirectional zener diode D34 is connected to the lower half end of the second zener capacitor CP20. It can be understood that the second voltage-stabilizing diode DZ5 and the first voltage-stabilizing capacitor C163 are in parallel relationship. On the basis that the first voltage-stabilizing capacitor C163 stabilizes the voltage at the first end of the isolator UP5, the second voltage-stabilizing diode DZ5 further stabilizes the voltage and ensures the filtering effect; the bidirectional voltage-stabilizing diode D34 and the second voltage-stabilizing capacitor CP20 are in parallel relationship. On the basis that the second voltage-stabilizing capacitor CP20 stabilizes the voltage at the fifth end of the isolator UP5, the bidirectional voltage-stabilizing diode D34 further stabilizes the voltage, ensuring that the second voltage-stabilizing capacitor CP20 plays a role in filtering and reducing noise on the level of the fifth end of the isolator UP5, thereby ensuring the normal operation of the circuit.

[0051] Furthermore, multiple capacitors may be provided in parallel with the second voltage stabilizing capacitor CP20, and each capacitor may filter high-frequency signals or low-frequency signals according to its capacitance value to ensure the normal operation of the power control circuit 300. In this embodiment, the power control circuit 300 is provided with capacitors C161 and C162, and both capacitors C161 and C162 are connected in parallel with the second voltage stabilizing capacitor CP20.

[0052] like Figure 5As shown, in one embodiment, the BMS key activation circuit 10 further includes a power supply circuit 600, wherein the power supply circuit 600 is used to provide a pull-up voltage signal for the key input circuit 100. The power supply circuit 600 includes an eleventh resistor R52, a twelfth resistor R53, a third transistor Q7 and a fourth voltage-stabilizing capacitor C54, wherein a first end of the eleventh resistor R52 is connected to the positive battery terminal of the analog front end 500, a second end of the eleventh resistor R52 is respectively connected to a first end of the twelfth resistor R53 and a control end of the third transistor Q7, a second end of the twelfth resistor R53 is connected to a first end of the third transistor Q7, a second end of the third transistor Q7 is connected to a controllable power supply, an upper half end of the fourth voltage-stabilizing capacitor C54 is connected to a second end of the third transistor Q7, and a lower half end of the fourth voltage-stabilizing capacitor C54 is connected to a control end of the third transistor Q7. It can be understood that when there is a key operation in the key input circuit 100, the current at the positive terminal of the battery in the power supply circuit 600 passes through the eleventh resistor R52 and the twelfth resistor R53 in sequence, and then is turned on at the control end of the third transistor Q7, so that the level of the key input circuit 100 is pulled up to a high-level activation signal, thereby activating the key enable circuit 200, so that the signal is transmitted to the analog front end 500, activating the power control circuit 300 so that the power control circuit 300 normally supplies power to the control unit 400. In this embodiment, the third transistor Q7 is an NPN transistor, whose first end is a collector, the second end is an emitter, and the third end is a base.

[0053] like Figure 5 As shown, in one embodiment, the power supply circuit 600 also includes a fourth transistor Q9, a first end of the fourth transistor Q9 is connected to the first end of the twelfth resistor R53, a second end of the fourth transistor Q9 is connected to the control end of the third transistor Q7, and the control end of the fourth transistor Q9 is connected to the lower half of the fourth voltage-stabilizing capacitor C54. It can be understood that when the fourth transistor Q9 is set, the current at the positive end of the battery can be gradually amplified to achieve the standard for normal operation of the power supply circuit 600. In this embodiment, the fourth transistor Q9 is an NPN transistor, the first end of which is the collector, the second end is the emitter, and the third end is the base.

[0054] like Figure 5 As shown, in one embodiment, the power supply circuit 600 further includes a thirteenth resistor R60 and a fourteenth resistor R63, the first end of the fourth transistor Q9 is connected to the first end of the twelfth resistor R53 through the thirteenth resistor R60, the control end of the fourth transistor Q9 is connected to the first end of the fourteenth resistor R63, and the second end of the fourteenth resistor R63 is connected to the first end of the twelfth resistor R53. It can be understood that when the thirteenth resistor R60 is connected in parallel with the fourteenth resistor R63, the fourth transistor Q9 is protected and the conduction condition of the fourth transistor Q9 is adjusted, and when the twelfth resistor R53 is connected in parallel with the thirteenth resistor R60, the third transistor Q7 is protected and the conduction condition of the third transistor Q7 is adjusted.

[0055] like Figure 5 As shown, in one embodiment, the power supply circuit 600 further includes a third voltage stabilizing diode D60 and a fifth voltage stabilizing capacitor C55, the upper half of the fifth voltage stabilizing capacitor C55 is connected to the second end of the fourteenth resistor R63, the lower half of the fifth voltage stabilizing capacitor C55 is respectively connected to the anode of the third voltage stabilizing diode D60 and the lower half of the fourth voltage stabilizing capacitor C54, and the cathode of the third voltage stabilizing diode D60 is connected to the control end of the fourth triode Q9. It can be understood that the fifth voltage stabilizing capacitor C55 is used to store the voltage of the positive terminal of the battery to stabilize the voltage of the positive terminal of the battery and reduce the voltage fluctuation, the fourth voltage stabilizing capacitor C54 is used to store the voltage of the controllable power supply to stabilize the voltage of the controllable power supply and reduce the voltage fluctuation of the controllable power supply, and the third voltage stabilizing diode D60 can ensure that the voltage of the control end of the fourth triode Q9 will not fluctuate greatly, thereby avoiding the fourth triode Q9 from being damaged.

[0056] Furthermore, the power supply circuit 600 is also provided with a capacitor C151, which is used to store the voltage of the controllable power supply. The capacitor C151 is connected in parallel with the fourth voltage stabilizing capacitor C54, and can filter high-frequency signals and low-frequency signals respectively according to their capacitance to stabilize the voltage of the controllable power supply.

[0057] The present disclosure also provides a portable electronic device, including the BMS button activation circuit 10 of any of the above embodiments. When the portable electronic device adopts the BMS button activation circuit 10, if the electronic device needs to be activated to work, the BMS can be activated by simply pressing a button, and the effect is simple and reliable. When the electronic device is no longer working, it enters a low power consumption mode, and the power control circuit 300 does not work to sleep the BMS, thereby extending the battery life.

[0058] Compared with the prior art, the present invention has at least the following advantages:

[0059] 1. To start the battery management system BMS, the user only needs to press the control switch SW1 to activate it. When there is a user key operation, the activation key enabling circuit 200 will be energized. After the activation signal is transmitted to the analog front end 500, the power control circuit 300 will work, so that the power control circuit 300 supplies power to the control unit 400. Furthermore, the BMS key activation circuit 10 can respond to key operations quickly and is easy to implement, ensuring the user's operating experience.

[0060] 2. When the cell voltage is lower than a certain value, the enable terminal SELF_POWERDOWN of the control unit 400 sends a power-off signal to disconnect the isolator UP5, so that the power control circuit 300 stops working and puts the BMS into sleep mode. As a result, the power consumption of the BMS button activation circuit 10 in the standby state is extremely low, which effectively prolongs the battery life.

[0061] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the disclosed patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the disclosed patent shall be subject to the attached claims.

Claims

1. A BMS button activation circuit (10), characterized in that: include: A key input circuit (100) comprises a first resistor (R190), a common diode (DP1) and a control switch (SW1), wherein a first end of the first resistor (R190) is used to connect to a standard power supply, a second end of the first resistor (R190) is used to connect to a switch control end of a control unit (400), a second end of the first resistor (R190) is also connected to an anode of the common diode (DP1), a cathode of the common diode (DP1) is connected to a first end of the control switch (SW1), and a second end of the control switch (SW1) is grounded; A key enabling circuit (200) comprises a second resistor (R106), a third resistor (R102), a fourth resistor (RK2), a fifth resistor (RA14) and a first transistor (QK3), wherein a first end of the second resistor (R106) is connected to a first end of the control switch (SW1), a second end of the second resistor (R106) is respectively connected to a first end of the third resistor (R102) and a control end of the first transistor (QK3), a second end of the third resistor (R102) is connected to a controllable power supply, a first end of the first transistor (QK3) is connected to a second end of the third resistor (R102), a second end of the first transistor (QK3) is connected to a first end of the fourth resistor (RK2), a second end of the fourth resistor (RK2) is connected to a first end of the fifth resistor (RA14), a first end of the fifth resistor (RA14) is also used to connect to an output end of an analog front end (500), and a second end of the fifth resistor (RA14) is grounded; A power control circuit (300) comprises a sixth resistor (R184), a seventh resistor (R155), an eighth resistor (R22), an isolator (UP5), a first voltage stabilizing capacitor (C163) and a second voltage stabilizing capacitor (CP20), wherein a first end of the sixth resistor (R184) is connected to an enable end of the control unit (400), a second end of the sixth resistor (R184) is connected to a third end of the isolator (UP5), the third end of the isolator (UP5) is also connected to a wake-up end of the analog front end (500), and a first end of the isolator (UP5) is connected to an enable end of the control unit (400). The first end of the seventh resistor (R155) and the upper half of the first voltage-stabilizing capacitor (C163) are respectively connected, the lower half of the first voltage-stabilizing capacitor (C163) is grounded, the second end of the seventh resistor (R155) is connected to a controllable power supply, the second end of the isolator (UP5) is grounded, the fifth end of the isolator (UP5) is respectively connected to the first end of the eighth resistor (R22) and the upper half of the second voltage-stabilizing capacitor (CP20), the lower half of the second voltage-stabilizing capacitor (CP20) is grounded, and the second end of the eighth resistor (R22) is connected to a standard power supply.

2. The BMS button activation circuit (10) according to claim 1, characterized in that: The key enabling circuit (200) further comprises a second transistor (QK2), a first end of the second transistor (QK2) being connected to a first end of the fourth resistor (RK2), a control end of the second transistor (QK2) being connected to a second end of the fourth resistor (RK2), and a second end of the second transistor (QK2) being connected to a first end of the fifth resistor (RA14).

3. The BMS button activation circuit (10) according to claim 2, characterized in that: The key enabling circuit (200) further comprises a third voltage stabilizing capacitor (CK2), wherein an upper half of the third voltage stabilizing capacitor (CK2) is connected to a first end of the second transistor (QK2), and a lower half of the third voltage stabilizing capacitor (CK2) is connected to a second end of the second transistor (QK2).

4. The BMS button activation circuit (10) according to claim 1, characterized in that: The key enabling circuit (200) further comprises a ninth resistor (RA10) and a first voltage stabilizing diode (ZA1), wherein the anode of the first voltage stabilizing diode (ZA1) is connected to the second end of the fifth resistor (RA14), the cathode of the first voltage stabilizing diode (ZA1) is respectively connected to the first end of the ninth resistor (RA10) and the second end of the fourth resistor (RK2), and the second end of the ninth resistor (RA10) is connected to the first end of the fifth resistor (RA14).

5. The BMS button activation circuit (10) according to claim 1, characterized in that: The power supply control circuit (300) further comprises a tenth resistor (R144), and the fifth end of the isolator (UP5) is connected to the third end of the isolator (UP5) via the tenth resistor (R144).

6. The BMS button activation circuit (10) according to claim 1, characterized in that: The power supply control circuit (300) further comprises a second voltage stabilizing diode (DZ5) and a bidirectional voltage stabilizing diode (D34), wherein the anode of the second voltage stabilizing diode (DZ5) is connected to the lower half end of the first voltage stabilizing capacitor (C163), and the cathode of the second voltage stabilizing diode (DZ5) is connected to the first end of the seventh resistor (R155); the first end of the bidirectional voltage stabilizing diode (D34) is connected to the first end of the eighth resistor (R22), and the second end of the bidirectional voltage stabilizing diode (D34) is connected to the lower half end of the second voltage stabilizing capacitor (CP20).

7. The BMS button activation circuit (10) according to claim 1, characterized in that: The BMS key activation circuit (10) further comprises a power supply circuit (600), comprising an eleventh resistor (R52), a twelfth resistor (R53), a third transistor (Q7) and a fourth voltage-stabilizing capacitor (C54), wherein a first end of the eleventh resistor (R52) is connected to a positive battery terminal of the analog front end (500), a second end of the eleventh resistor (R52) is respectively connected to a first end of the twelfth resistor (R53) and a control end of the third transistor (Q7), a second end of the twelfth resistor (R53) is connected to a first end of the third transistor (Q7), a second end of the third transistor (Q7) is connected to a controllable power supply, an upper half end of the fourth voltage-stabilizing capacitor (C54) is connected to a second end of the third transistor (Q7), and a lower half end of the fourth voltage-stabilizing capacitor (C54) is connected to the control end of the third transistor (Q7).

8. The BMS button activation circuit (10) according to claim 7, characterized in that: The power supply circuit (600) further comprises a fourth transistor (Q9), a first end of the fourth transistor (Q9) being connected to the first end of the twelfth resistor (R53), a second end of the fourth transistor (Q9) being connected to the control end of the third transistor (Q7), and a control end of the fourth transistor (Q9) being connected to the lower half end of the fourth voltage-stabilizing capacitor (C54); The power supply circuit (600) further comprises a thirteenth resistor (R60) and a fourteenth resistor (R63); a first end of the fourth transistor (Q9) is connected to a first end of the twelfth resistor (R53) via the thirteenth resistor (R60); a control end of the fourth transistor (Q9) is connected to a first end of the fourteenth resistor (R63); and a second end of the fourteenth resistor (R63) is connected to a first end of the twelfth resistor (R53).

9. The BMS button activation circuit (10) according to claim 8, characterized in that: The power supply circuit (600) also includes a third voltage-stabilizing diode (D60) and a fifth voltage-stabilizing capacitor (C55), wherein the upper end of the fifth voltage-stabilizing capacitor (C55) is connected to the second end of the fourteenth resistor (R63), the lower end of the fifth voltage-stabilizing capacitor (C55) is respectively connected to the anode of the third voltage-stabilizing diode (D60) and the lower end of the fourth voltage-stabilizing capacitor (C54), and the cathode of the third voltage-stabilizing diode (D60) is connected to the control end of the fourth transistor (Q9).

10. A portable electronic device, characterized in that: It comprises the BMS button activation circuit (10) as claimed in any one of claims 1 to 9.

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