Battery power supply circuit

Abstract

The utility model discloses a battery power supply circuit, and relates to the technical field of battery charging, and the battery power supply circuit comprises a charging circuit, a charging control circuit, and a switching circuit. When a charging power supply is connected, the charging control circuit detects the battery voltage of the battery, when the battery voltage is not larger than a preset safety voltage, it is judged that the battery is in an over-discharge state at present, and a turn-off signal is correspondingly sent to the switching circuit so that the switching circuit can cut off a connection loop between the battery and the load. At the moment, because the switching circuit cuts off the connection relation between the battery and the load, the load does not consume electric energy when the battery is charged, and the charging circuit can only transmit a charging signal provided by the charging power supply to the battery and only provide electric energy for the battery, so that trickle charging of the battery in an over-discharge state is realized.

Description

Technical Field

[0001] This application relates to the field of battery charging technology, and in particular to a battery power supply circuit. Background Technology

[0002] In existing technologies, some battery-powered electronic devices typically use rechargeable batteries, which are directly connected to the load. This allows the power supply to charge the battery while simultaneously powering the load, achieving a "charge and use simultaneously" effect. However, when a battery is over-discharged, such as in scenarios where it has not been used for a long time, it is essentially an open circuit. Even if the electronic device is plugged into a power supply, most of the electrical energy provided by the power supply will be consumed by the load, leaving almost no current to be transferred to the battery, thus preventing it from charging. Utility Model Content

[0003] The main objective of this application is to provide a battery power supply circuit that aims to solve the technical problem of how to prevent batteries in electronic devices from failing to charge due to being in an over-discharged state.

[0004] To achieve the above objectives, this application provides a battery power supply circuit, which includes: a charging circuit, a charging control circuit, and a switching circuit;

[0005] The input terminal of the charging circuit and the first terminal of the charging control circuit are used to connect to the charging power supply. The output terminal of the charging circuit and the second terminal of the charging control circuit are connected to the battery. The third terminal of the charging control circuit is connected to the control terminal of the switching circuit. The input terminal of the switching circuit is connected to the battery, and the output terminal of the switching circuit is connected to the power supply terminal of the load.

[0006] The charging control circuit is used to send a shutdown signal to the switching circuit when the charging power supply is connected and the battery voltage of the battery is detected to be no greater than a preset safe voltage.

[0007] The switching circuit is used to disconnect the connection circuit between the battery and the load when the shutdown signal is received;

[0008] The charging circuit is used to transmit the charging signal provided by the charging power supply to the battery when the connection circuit between the battery and the load is disconnected.

[0009] In one embodiment, the charging control circuit includes: a charging detection circuit and a voltage detection circuit;

[0010] The input terminal of the charging detection circuit is connected to the charging power supply, the output terminal of the charging detection circuit is connected to the trigger terminal of the voltage detection circuit, the input terminal of the voltage detection circuit is connected to the battery, and the output terminal of the voltage detection circuit is connected to the control terminal of the switching circuit.

[0011] The charging detection circuit is used to send a corresponding trigger signal to the voltage detection circuit when it detects a charging signal provided by the charging power supply.

[0012] The voltage detection circuit is used to detect whether the battery voltage is greater than the preset safety voltage when the trigger signal is received, and to send the shutdown signal to the switching circuit when the battery voltage is not greater than the preset safety voltage.

[0013] In one embodiment, the charging detection circuit includes: a first resistor and a first N-type transistor;

[0014] The collector of the first N-type transistor is connected to the trigger terminal of the voltage detection circuit, the base of the first N-type transistor is connected to the first terminal of the first resistor, the second terminal of the first resistor is used to connect to the charging power supply, and the emitter of the first N-type transistor is grounded.

[0015] In one embodiment, the voltage detection circuit includes: a second resistor, a third resistor, a fourth resistor, a first PMOS transistor, and a first diode;

[0016] The gate of the first PMOS transistor is connected to the output terminal of the charging detection circuit and the second terminal of the second resistor, respectively. The source of the first PMOS transistor is connected to the first terminal of the second resistor and the battery, respectively. The drain of the first PMOS transistor is connected to the first terminal of the third resistor. The second terminal of the third resistor is connected to the first terminal of the fourth resistor and the anode of the first diode, respectively. The cathode of the first diode is connected to the control terminal of the switching circuit, and the second terminal of the fourth resistor is grounded.

[0017] In one embodiment, the battery-powered circuit further includes a controller and a signal acquisition circuit;

[0018] The controller is connected to the output terminal of the signal acquisition circuit and the control terminal of the load, respectively. The input terminal of the signal acquisition circuit is connected to the output terminal of the charging detection circuit and the trigger terminal of the voltage detection circuit, respectively.

[0019] The signal acquisition circuit is used to acquire the trigger signal output by the charging detection circuit and transmit the trigger signal to the controller;

[0020] The controller is used to control the load to enter a standby state when it receives the trigger signal.

[0021] In one embodiment, the signal acquisition circuit includes: a fifth resistor, a first capacitor, a first Zener diode, and a second Zener diode;

[0022] The cathode of the first Zener diode is connected to the system power supply. The anode of the first Zener diode is connected to the cathode of the second Zener diode, the first end of the fifth resistor, the output end of the charging detection circuit, and the trigger end of the voltage detection circuit. The second end of the fifth resistor is connected to the second end of the first capacitor and the controller. The second end of the first capacitor and the anode of the second Zener diode are grounded.

[0023] In one embodiment, the battery-powered circuit further includes: a forced-on circuit;

[0024] The forced-open circuit is connected to the controller, and the controller is also connected to the third terminal of the charging control circuit and the control terminal of the switching circuit.

[0025] The forced activation circuit is used to send a forced drive signal to the controller when a physical trigger signal triggered by the user is detected.

[0026] The controller is further configured to send a forced start signal to the switching circuit when it receives the physical trigger signal and the forced drive signal;

[0027] The switching circuit is also used to forcibly open the connection circuit between the battery and the load when the forced open signal is received.

[0028] In one embodiment, the forced-on circuit includes: a sixth resistor, a second diode, and a physical switch;

[0029] The anode of the second diode is connected to the system power supply, the cathode of the second diode is connected to the controller and the first terminal of the sixth resistor, the second terminal of the sixth resistor is connected to the first terminal of the physical switch, and the second terminal of the physical switch is grounded.

[0030] In one embodiment, the battery power supply circuit further includes: a third diode;

[0031] The anode of the third diode is connected to the controller, and the cathode of the third diode is connected to the third terminal of the charging control circuit and the control terminal of the switching circuit.

[0032] In one embodiment, the switching circuit includes: a seventh resistor, a second N-type transistor, and a second PMOS transistor;

[0033] The base of the second N-type transistor is connected to the third terminal of the charging control circuit, the emitter of the second N-type transistor is grounded, the collector of the second N-type transistor is connected to the second terminal of the seventh resistor and the gate of the second PMOS transistor, respectively; the source of the second PMOS transistor is connected to the first terminal of the seventh resistor and the battery, respectively, and the drain of the second PMOS transistor is connected to the power supply terminal of the load.

[0034] This application provides a battery power supply circuit, comprising: a charging circuit, a charging control circuit, and a switching circuit; the input terminal of the charging circuit and the first terminal of the charging control circuit are connected to a charging power source, the output terminal of the charging circuit and the second terminal of the charging control circuit are connected to a battery, and the third terminal of the charging control circuit is connected to the control terminal of the switching circuit; the input terminal of the switching circuit is connected to the battery, and the output terminal of the switching circuit is connected to the power supply terminal of a load; the charging control circuit is used to send a shutdown signal to the switching circuit when the charging power source is connected and the battery voltage is detected to be no greater than a preset safety voltage; the switching circuit is used to disconnect the connection loop between the battery and the load when the shutdown signal is received; the charging circuit is used to transmit the charging signal provided by the charging power source to the battery when the connection loop between the battery and the load is disconnected.

[0035] When a charging power source is connected, the charging control circuit detects the battery voltage. If the battery voltage is not greater than a preset safe voltage, it determines that the battery is currently in an over-discharged state and sends a shutdown signal to the switching circuit to disconnect the connection between the battery and the load. At this time, because the switching circuit has disconnected the connection between the battery and the load, the load will not consume electrical energy while the battery is charging. The charging circuit can only transmit the charging signal provided by the charging power source to the battery, providing electrical energy only to the battery, thereby achieving trickle charging for the over-discharged battery. Attached Figure Description

[0036] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0037] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a structural connection diagram provided for Embodiment 1 of the battery power supply circuit of this application;

[0039] Figure 2 This is a circuit connection diagram provided for Embodiment 2 of the battery power supply circuit of this application;

[0040] Figure 3 The circuit connection diagram provided for Embodiment 3 of the battery power supply circuit of this application.

[0041] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0043] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0044] This application presents a battery power supply circuit according to a first embodiment. Please refer to [link / reference]. Figure 1 The battery power supply circuit includes: a charging circuit 10, a charging control circuit 20, and a switching circuit 30;

[0045] The input terminal of the charging circuit 10 and the first terminal of the charging control circuit 20 are connected to the charging power supply Us. The output terminal of the charging circuit 10 and the second terminal of the charging control circuit 20 are connected to the battery Bat. The third terminal of the charging control circuit 20 is connected to the control terminal of the switching circuit 30. The input terminal of the switching circuit 30 is connected to the battery Bat, and the output terminal of the switching circuit 30 is connected to the power supply terminal of the load Load.

[0046] The charging control circuit 20 is used to send a shutdown signal to the switching circuit 30 when the charging power supply Us is connected and the battery voltage of the battery Bat is detected to be no greater than a preset safe voltage.

[0047] The switching circuit 30 is used to disconnect the connection circuit between the battery Bat and the load Load when the shutdown signal is received.

[0048] The charging circuit 10 is used to transmit the charging signal provided by the charging power supply Us to the battery Bat when the connection circuit between the battery Bat and the load Load is disconnected.

[0049] It should be noted that the charging signal refers to a low-voltage DC electrical signal, mainly used to charge the battery (Bat) or supply power to the load (Load). In this embodiment, the charging circuit 10 is a circuit with voltage regulation and transformation functions, such as a low dropout regulator (LDO), which is located between the interface of the charging power supply Us and the battery (Bat). The battery (Bat) is also connected to the load (Load) through the switching circuit 30. When the battery power supply circuit is connected to the charging power supply Us, the charging circuit 10 can convert the high-voltage DC power provided by the charging power supply Us into a low-voltage DC charging signal and transmit the charging signal to the battery (Bat) to charge it. If the switching circuit 30 between the battery (Bat) and the load (Load) is in a conducting state, the charging circuit 10 can also transmit the charging signal to the load (Load), simultaneously charging the battery (Bat) and supplying power to the load (Load).

[0050] It is easy to understand that the preset safety voltage refers to a pre-set threshold voltage used to determine whether the battery Bat is in an over-discharge state. When the battery voltage exceeds the preset safety voltage, it can be determined that the battery Bat is not currently in an over-discharge state; when the battery voltage does not exceed the preset safety voltage, it can be determined that the battery Bat is currently in an over-discharge state. In this embodiment, when the charging power supply circuit is connected to the charging power supply Us, the charging control circuit 20 can detect the battery voltage of the battery Bat to determine whether the current battery Bat is in an over-discharge state. If the charging control circuit 20 detects that the current battery voltage does not exceed the preset safety voltage, it can determine that the current battery Bat is in an over-discharge state, and then sends a high-level or low-level shutdown signal to the switching circuit 30 accordingly. When the switching circuit 30 receives the shutdown signal, it can disconnect the connection loop between the battery Bat and the load Load. At this time, the charging power supply Us is only connected to the battery Bat through the charging circuit 10 and not connected to the load Load. Therefore, the charging circuit 10 can only transmit the electrical energy provided by the charging power supply Us to the battery Bat in the over-discharge state in the form of a charging signal to perform trickle charging on the battery Bat.

[0051] The above structure avoids the situation where the battery Bat inside the electronic device cannot obtain the current provided by the charging power source Us due to being over-discharged. It can effectively ensure that the battery Bat can be effectively charged when the electronic device is connected to the charging power source Us, thereby improving the battery life of the electronic device and enhancing the user experience.

[0052] This application provides a battery power supply circuit, which includes a charging circuit, a charging control circuit, and a switching circuit. When a charging power source is connected, the charging control circuit detects the battery voltage. If the battery voltage is not greater than a preset safe voltage, it determines that the battery is currently in an over-discharged state and sends a shutdown signal to the switching circuit to disconnect the connection between the battery and the load. At this time, since the switching circuit disconnects the connection between the battery and the load, the load will not consume electrical energy while the battery is charging. The charging circuit can only transmit the charging signal provided by the charging power source to the battery, providing electrical energy only to the battery, thereby achieving trickle charging for the over-discharged battery.

[0053] Based on the first embodiment of this application, in the second embodiment of this application, the content that is the same as or similar to that in Embodiment 1 above can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 2 The charging control circuit 20 includes a charging detection circuit 21 and a voltage detection circuit 22.

[0054] The input terminal of the charging detection circuit 21 is connected to the charging power supply Us, the output terminal of the charging detection circuit 21 is connected to the trigger terminal of the voltage detection circuit 22, the input terminal of the voltage detection circuit 22 is connected to the battery Bat, and the output terminal of the voltage detection circuit 22 is connected to the control terminal of the switching circuit 30.

[0055] The charging detection circuit 21 is used to send a corresponding trigger signal to the voltage detection circuit 22 when it detects a charging signal provided by the charging power supply Us.

[0056] The voltage detection circuit 22 is used to detect whether the battery voltage is greater than the preset safety voltage when the trigger signal is received, and to send the shutdown signal to the switching circuit 30 when the battery voltage is not greater than the preset safety voltage.

[0057] It should be noted that in this embodiment, the charging detection circuit 21 can detect whether the current charging power supply Us is connected to the battery power supply circuit. If the charging detection circuit 21 detects a charging signal provided by the charging power supply Us, it can determine that the current charging power supply Us is connected to the battery power supply circuit, and it is necessary to determine whether the current battery Bat is in an over-discharged state. At this time, the charging detection circuit 21 can send a trigger signal to the voltage detection circuit 22 to make the voltage detection circuit 22 start working to determine whether the current battery Bat is in an over-discharged state. When the voltage detection circuit 22 receives the trigger signal, it starts working, detects the battery voltage, and when the battery voltage does not exceed the preset safety voltage, it sends a shutdown signal to the switching circuit 30 to make the switching circuit 30 disconnect the connection circuit between the battery Bat and the load Load, so that the charging power supply Us alone performs trickle charging for the battery Bat in the over-discharged state.

[0058] Furthermore, in this embodiment, the charging detection circuit 21 includes: a first resistor R1 and a first N-type transistor Vn1;

[0059] The collector of the first N-type transistor Vn1 is connected to the trigger terminal of the voltage detection circuit 22, the base of the first N-type transistor Vn1 is connected to the first terminal of the first resistor R1, the second terminal of the first resistor R1 is used to connect to the charging power supply Us, and the emitter of the first N-type transistor Vn1 is grounded.

[0060] It should be noted that in this embodiment, the first resistor R1 is a current-limiting resistor for the base of the first N-type transistor Vn1, preventing excessive current from the charging signal from damaging the first N-type transistor Vn1. When the base of the first N-type transistor Vn1 receives the charging signal, it can enter the conducting state, connecting the voltage detection circuit 22 to the ground line, thus providing a low-level trigger signal for the voltage detection circuit 22.

[0061] Furthermore, in this embodiment, the voltage detection circuit 22 includes: a second resistor R2, a third resistor R3, a fourth resistor R4, a first PMOS transistor Qp1, and a first diode D1;

[0062] The gate of the first PMOS transistor Qp1 is connected to the output terminal of the charging detection circuit 21 and the second terminal of the second resistor R2, respectively. The source of the first PMOS transistor Qp1 is connected to the first terminal of the second resistor R2 and the battery Bat, respectively. The drain of the first PMOS transistor Qp1 is connected to the first terminal of the third resistor R3. The second terminal of the third resistor R3 is connected to the first terminal of the fourth resistor R4 and the anode of the first diode D1, respectively. The cathode of the first diode D1 is connected to the control terminal of the switching circuit 30, and the second terminal of the fourth resistor R4 is grounded.

[0063] It should be noted that in this embodiment, the source of the first PMOS transistor Qp1 is connected to the battery Bat, and the gate of the first PMOS transistor Qp1 is connected to the battery Bat and the charging detection circuit 21 through the second resistor R2. If the battery voltage does not exceed the preset safe voltage and the battery power supply circuit is connected to the charging power supply Us, the gate of the first PMOS transistor Qp1 is at a low level due to receiving a low-level trigger signal, and the first PMOS transistor Qp1 is turned on. The voltage divider structure formed by the third resistor R3 and the fourth resistor R4 divides the battery voltage, thereby generating a lower voltage turn-off signal (or can be understood as a low-level turn-off signal) to the switching circuit 30. This causes the switching circuit 30 to disconnect the connection between the battery Bat and the load Load. If the battery voltage exceeds the preset safe voltage and the battery power supply circuit is connected to the charging power supply Us, the first PMOS transistor Qp1 remains on. The voltage divider structure formed by the third resistor R3 and the fourth resistor R4 divides the battery voltage, thereby generating a higher voltage turn-off signal (or a high-level turn-on signal) to the switching circuit 30. This causes the switching circuit 30 to connect the connection between the battery Bat and the load Load. In this way, the charging power supply Us can charge the battery Bat, which is not in an over-discharged state, while also supplying power to the load Load.

[0064] It is worth noting that in this embodiment, if the battery power supply circuit is not connected to the charging power supply Us, the gate of the first PMOS transistor Qp1 is directly connected to the source through the second resistor R2. The first PMOS transistor Qp1 is not turned on, and therefore will not control the on / off state of the switching circuit 30 according to the comparison result of the battery voltage and the preset safety voltage. At this time, the on / off state of the switching circuit 30 can be controlled by other control methods. The second diode D2 is used to prevent the electrical signals generated by other control methods from flowing back into the voltage detection circuit 22 and causing interference.

[0065] Furthermore, in this embodiment, the battery power supply circuit further includes: a controller 40 and a signal acquisition circuit 50;

[0066] The controller 40 is connected to the output terminal of the signal acquisition circuit 50 and the control terminal of the load, respectively. The input terminal of the signal acquisition circuit 50 is connected to the output terminal of the charging detection circuit 21 and the trigger terminal of the voltage detection circuit 22, respectively.

[0067] The signal acquisition circuit 50 is used to acquire the trigger signal output by the charging detection circuit 21 and transmit the trigger signal to the controller 40;

[0068] The controller 40 is used to control the load to enter a standby state when it receives the trigger signal.

[0069] It should be noted that the controller 40 is mainly used to control the charging and discharging of the battery Bat and the operating state of the load. In this embodiment, generally speaking, when charging the electronic device, even if the battery Bat is not over-discharged, its charge level is likely to be low. The user's need is to quickly charge the battery Bat without requiring the load to operate.

[0070] It is easy to understand that in this embodiment, the signal acquisition circuit 50 can acquire whether the current charging detection circuit 21 outputs a trigger signal, thereby determining whether the battery power supply circuit is connected to the charging power supply Us. If the signal acquisition circuit 50 detects that the charging detection circuit 21 outputs a trigger signal, it can determine that the charging power supply Us is currently connected, and send the acquired trigger signal to the controller 40, so that the controller 40 controls the load Load to enter a low-power standby state, reducing the loss caused by the charging power supply Us supplying power to the load Load, thereby improving the charging speed of the battery Bat.

[0071] Furthermore, in this embodiment, the signal acquisition circuit 50 includes: a fifth resistor R5, a first capacitor C1, a first Zener diode Dw1, and a second Zener diode Dw2;

[0072] The cathode of the first Zener diode Dw1 is connected to the system power supply VCC. The anode of the first Zener diode Dw1 is connected to the cathode of the second Zener diode Dw2, the first end of the fifth resistor R5, the output terminal of the charging detection circuit 21, and the trigger terminal of the voltage detection circuit 22. The second end of the fifth resistor is connected to the second end of the first capacitor C1 and the controller 40. The second end of the first capacitor C1 and the anode of the second Zener diode Dw2 are grounded.

[0073] It should be noted that the system power supply VCC refers to the power supply that supports the operation of the controller 40, which can be provided by the charging circuit 10. In this embodiment, the first Zener diode Dw1 and the second Zener diode Dw2 are disposed between the system power supply VCC and the ground line to regulate the voltage of the acquired trigger signal. The fifth resistor R5 acts as a current-limiting resistor to protect the controller 40 from damage caused by receiving a trigger signal with excessive current. The first capacitor C1 is used to filter the acquired trigger signal, improve the accuracy of the trigger signal, and prevent the controller 40 from erroneously controlling the load Load to enter the standby state due to accidental triggering.

[0074] Based on the first and / or second embodiments of this application, in the third embodiment of this application, the content that is the same as or similar to that in embodiments one and two above can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 3The battery power supply circuit further includes: a forced start circuit 60;

[0075] The forced-open circuit 60 is connected to the controller 40, and the controller 40 is also connected to the third terminal of the charging control circuit 20 and the control terminal of the switching circuit 30.

[0076] The forced activation circuit 60 is used to send a forced drive signal to the controller 40 when a physical trigger signal triggered by the user is detected.

[0077] The controller 40 is also configured to send a forced start signal to the switching circuit 30 when it receives the physical trigger signal and the forced drive signal;

[0078] The switching circuit 30 is also used to forcibly open the connection loop between the battery Bat and the load Load when the forced open signal is received.

[0079] It should be noted that in this embodiment, in actual situations, there may be situations where electronic devices need to be used urgently but the battery Bat is low on power. In such cases, when the electronic device is connected to the charging power supply Us, the user can use the forced start circuit 60 to switch the load Load from standby or power off state to working state, so that the load Load can be forced to work even when the battery Bat is not fully charged.

[0080] As is easily understood, a physical trigger signal refers to a signal triggered by a user in a physical form, such as pressure generated by a touch. Specifically, it can be a physical signal generated to trigger a switch. In this embodiment, if the current battery (Bat) has a low charge and the electronic device (or load) needs to be used urgently, after the charging power supply (Us) is connected to the battery power supply circuit, the forced start circuit (60) detects the physical trigger signal provided by the user. The forced start circuit (60) will send a forced drive signal to the controller (40), causing the controller (40) to send a forced start signal to the switch circuit (30), forcing the switch circuit (30) into a conducting state. This connects the battery (Bat) and the load (Load), allowing the charging power supply (Us) to directly supply power to the load (Load) and support the load (Load) to enter a high-power operating mode.

[0081] Furthermore, in this embodiment, the forced-on circuit 60 includes: a sixth resistor R6, a second diode D2, and a physical switch SW;

[0082] The anode of the second diode D2 is connected to the system power supply VCC, and the cathode of the second diode D2 is connected to the controller 40 and the first terminal of the sixth resistor R6. The second terminal of the sixth resistor R6 is connected to the first terminal of the physical switch SW, and the second terminal of the physical switch SW is grounded.

[0083] It should be noted that the physical switch SW can be a push-button switch, a DIP switch, or other types of switches; the specific switch type is not specifically limited. In this embodiment, the second diode D2 is used to rectify the current supplied by the system power supply VCC, preventing abnormal current generated by the switching state of the physical switch SW from flowing back into the system power supply VCC. The sixth resistor R6 is the current-limiting resistor of the controller 40, used to prevent excessive current supplied by the system power supply VCC from damaging the controller 40. When the physical switch SW receives a physical trigger signal from the user, it can enter the conducting state, allowing the controller 40 to be directly connected to the ground wire, which can be understood as the controller 40 receiving a low-level forced drive signal. At this time, the controller 40 can send a corresponding forced turn-on signal to the switch circuit 30, so that the switch circuit 30 forcibly conducts the connection circuit between the battery Bat and the load Load.

[0084] Furthermore, in this embodiment, the battery power supply circuit further includes: a third diode D3;

[0085] The anode of the third diode D3 is connected to the controller 40, and the cathode of the third diode D3 is connected to the third terminal of the charging control circuit 20 and the control terminal of the switching circuit 30.

[0086] It is easy to understand that, in this embodiment, since the control terminal of the switching circuit 30 is also connected to the third terminal of the charging control circuit 20, the controller 40 may also receive a high-level start signal from the charging control circuit 20. To protect the controller 40 from damage due to receiving a high-level start signal, the controller 40 can be connected to the control terminal of the switching circuit 30 via a third diode D3 to prevent current from flowing back into the controller 40.

[0087] Furthermore, in this embodiment, the switching circuit 30 includes: a seventh resistor R7, a second N-type transistor Vn2, and a second PMOS transistor Qp2;

[0088] The base of the second N-type transistor Vn2 is connected to the third terminal of the charging control circuit 20, the emitter of the second N-type transistor Vn2 is grounded, the collector of the second N-type transistor Vn2 is connected to the second terminal of the seventh resistor R7 and the gate of the second PMOS transistor Qp2, respectively; the source of the second PMOS transistor Qp2 is connected to the first terminal of the seventh resistor R7 and the battery Bat, respectively; and the drain of the second PMOS transistor Qp2 is connected to the power supply terminal of the load Load.

[0089] It should be noted that in this embodiment, the second PMOS transistor Qp2 is used to control the on / off state of the connection circuit between the battery Bat and the load Load, while the second N-type transistor Vn2 is used to control the on / off state of the second PMOS transistor Qp2. When the second N-type transistor Vn2 receives a high-level turn-on signal or a forced turn-on signal, it pulls down the gate voltage of the second PMOS transistor Qp2, thereby turning on the second PMOS transistor Qp2 and thus putting the connection circuit between the battery Bat and the load Load into the conducting state. When the second N-type transistor Vn2 receives a low-level turn-off signal, the gate of the second PMOS transistor Qp2 is essentially connected to the battery Bat through the seventh resistor R7, that is, the gate voltage is almost equal to the source voltage (battery voltage). At this time, the second PMOS transistor Qp2 is turned off, thereby putting the connection circuit between the battery Bat and the load Load into the off state.

[0090] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent scope of this application.

Claims

1. A battery-powered circuit, characterized in that, The battery power supply circuit includes: a charging circuit, a charging control circuit, and a switching circuit. The input terminal of the charging circuit and the first terminal of the charging control circuit are used to connect to the charging power supply. The output terminal of the charging circuit and the second terminal of the charging control circuit are connected to the battery. The third terminal of the charging control circuit is connected to the control terminal of the switching circuit. The input terminal of the switching circuit is connected to the battery, and the output terminal of the switching circuit is connected to the power supply terminal of the load. The charging control circuit is used to send a shutdown signal to the switching circuit when the charging power supply is connected and the battery voltage of the battery is detected to be no greater than a preset safety voltage. The switching circuit is used to disconnect the connection circuit between the battery and the load when the shutdown signal is received; The charging circuit is used to transmit the charging signal provided by the charging power supply to the battery when the connection circuit between the battery and the load is disconnected.

2. The battery-powered circuit as described in claim 1, characterized in that, The charging control circuit includes: a charging detection circuit and a voltage detection circuit; The input terminal of the charging detection circuit is connected to the charging power supply, the output terminal of the charging detection circuit is connected to the trigger terminal of the voltage detection circuit, the input terminal of the voltage detection circuit is connected to the battery, and the output terminal of the voltage detection circuit is connected to the control terminal of the switching circuit. The charging detection circuit is used to send a corresponding trigger signal to the voltage detection circuit when it detects a charging signal provided by the charging power supply. The voltage detection circuit is used to detect whether the battery voltage is greater than the preset safety voltage when the trigger signal is received, and to send the shutdown signal to the switching circuit when the battery voltage is not greater than the preset safety voltage.

3. The battery-powered circuit as described in claim 2, characterized in that, The charging detection circuit includes: a first resistor and a first N-type transistor; The collector of the first N-type transistor is connected to the trigger terminal of the voltage detection circuit, the base of the first N-type transistor is connected to the first terminal of the first resistor, the second terminal of the first resistor is used to connect to the charging power supply, and the emitter of the first N-type transistor is grounded.

4. The battery-powered circuit as described in claim 2, characterized in that, The voltage detection circuit includes: a second resistor, a third resistor, a fourth resistor, a first PMOS transistor, and a first diode; The gate of the first PMOS transistor is connected to the output terminal of the charging detection circuit and the second terminal of the second resistor, respectively. The source of the first PMOS transistor is connected to the first terminal of the second resistor and the battery, respectively. The drain of the first PMOS transistor is connected to the first terminal of the third resistor. The second terminal of the third resistor is connected to the first terminal of the fourth resistor and the anode of the first diode, respectively. The cathode of the first diode is connected to the control terminal of the switching circuit, and the second terminal of the fourth resistor is grounded.

5. The battery-powered circuit as described in claim 2, characterized in that, The battery-powered circuit also includes: a controller and a signal acquisition circuit; The controller is connected to the output terminal of the signal acquisition circuit and the control terminal of the load, respectively. The input terminal of the signal acquisition circuit is connected to the output terminal of the charging detection circuit and the trigger terminal of the voltage detection circuit, respectively. The signal acquisition circuit is used to acquire the trigger signal output by the charging detection circuit and transmit the trigger signal to the controller; The controller is used to control the load to enter a standby state when it receives the trigger signal.

6. The battery-powered circuit as described in claim 5, characterized in that, The signal acquisition circuit includes: a fifth resistor, a first capacitor, a first Zener diode, and a second Zener diode; The cathode of the first Zener diode is connected to the system power supply. The anode of the first Zener diode is connected to the cathode of the second Zener diode, the first end of the fifth resistor, the output end of the charging detection circuit, and the trigger end of the voltage detection circuit. The second end of the fifth resistor is connected to the second end of the first capacitor and the controller. The second end of the first capacitor and the anode of the second Zener diode are grounded.

7. The battery-powered circuit as described in claim 5, characterized in that, The battery power supply circuit also includes: a forced-on circuit; The forced-open circuit is connected to the controller, and the controller is also connected to the third terminal of the charging control circuit and the control terminal of the switching circuit. The forced activation circuit is used to send a forced drive signal to the controller when a physical trigger signal triggered by the user is detected. The controller is further configured to send a forced start signal to the switching circuit when it receives the physical trigger signal and the forced drive signal; The switching circuit is also used to forcibly open the connection circuit between the battery and the load when the forced open signal is received.

8. The battery-powered circuit as described in claim 7, characterized in that, The forced-open circuit includes: a sixth resistor, a second diode, and a physical switch; The anode of the second diode is connected to the system power supply, the cathode of the second diode is connected to the controller and the first terminal of the sixth resistor, the second terminal of the sixth resistor is connected to the first terminal of the physical switch, and the second terminal of the physical switch is grounded.

9. The battery-powered circuit as described in claim 7, characterized in that, The battery power supply circuit also includes: a third diode; The anode of the third diode is connected to the controller, and the cathode of the third diode is connected to the third terminal of the charging control circuit and the control terminal of the switching circuit.

10. The battery-powered circuit as described in claim 1, characterized in that, The switching circuit includes: a seventh resistor, a second N-type transistor, and a second PMOS transistor; The base of the second N-type transistor is connected to the third terminal of the charging control circuit, the emitter of the second N-type transistor is grounded, the collector of the second N-type transistor is connected to the second terminal of the seventh resistor and the gate of the second PMOS transistor, respectively; the source of the second PMOS transistor is connected to the first terminal of the seventh resistor and the battery, respectively, and the drain of the second PMOS transistor is connected to the power supply terminal of the load.

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