Power supply control circuit and electric appliance

Abstract

The application relates to the field of power electronics, and discloses a power supply control circuit and an electric appliance. The circuit comprises a first switching circuit, a voltage dividing circuit and a second switching circuit. The voltage input end of the voltage dividing circuit is connected with a chargeable power supply, the voltage output end is connected with the control end of the second switching circuit, and the grounding end is connected with the first end of the first switching circuit. The first control end of the first switching circuit is connected with the external power supply interface of a power supply object, the second control end receives the standby control signal of the power supply object, and the second end is grounded. The first end of the second switching circuit is connected with the chargeable power supply, and the second end is connected with the internal power supply interface of the power supply object. The power supply control between the chargeable power supply and the power supply object is realized in a hardware circuit signal self-driving mode, external control signals and controllers need not be added, the existing controller circuit need not be changed, and the power supply control circuit only needs to be arranged between the chargeable power supply and the power supply object, so that the production cost is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of power electronics technology, specifically to power supply control circuits and electrical equipment. Background Technology

[0002] Currently, portable electronic devices are becoming increasingly common, such as portable electric fans. Due to the overall size limitations of these portable electronic devices, the size and capacity of their built-in batteries are generally not very large. In this case, it is necessary to consider not only the operating time that the battery can maintain when the device is working normally, but also the battery life in standby mode. This is to avoid the need for frequent charging when the user is not using the device, as well as the problem of the battery being damaged due to over-discharge when the user is not charging the device.

[0003] To extend battery standby time, two common techniques are employed: increasing battery capacity to extend battery life, and adding a switch to cut off battery power when the device is not in use, reducing battery output and minimizing power loss. Both of these approaches increase battery capacity but also increase size, hindering overall device assembly and failing to meet the design requirements for portability and miniaturization. While adding a switch can cut off battery power when the device is not in use and extend standby time, ensuring the battery charges normally while disconnecting power presents a new technical challenge.

[0004] In related technologies, the control of battery power-off operation and normal charging is achieved by adding external control signals through software processing using the main control chip. This requires modifications to the existing battery and device power supply circuits, increasing production costs. Summary of the Invention

[0005] In view of this, the present invention provides a power supply control circuit and electrical equipment to solve the problem that the switching control between power outage resumption and normal charging of electrical equipment in related technologies requires external control signals from the main control chip, resulting in high production costs.

[0006] In a first aspect, the present invention provides a power supply control circuit, comprising: a first switching circuit, a voltage divider circuit, and a second switching circuit;

[0007] The voltage input terminal of the voltage divider circuit is connected to the rechargeable power supply, the voltage output terminal is connected to the control terminal of the second switching circuit, and the ground terminal is connected to the first terminal of the first switching circuit.

[0008] The first control terminal of the first switching circuit is connected to the external power supply interface of the power supply object, the second control terminal receives the standby control signal of the power supply object, and the second terminal is grounded.

[0009] The first end of the second switching circuit is connected to the rechargeable power supply, and the second end is connected to the internal power supply interface of the power supply object.

[0010] The first switching circuit is turned on when it does not receive the standby control signal or when the external power supply interface is connected to external power, and is turned off when it receives the standby control signal and the external power supply interface is not connected to external power. The second switching circuit has the same on state as the first switching circuit.

[0011] This invention utilizes a second switching circuit to power and charge the internal rechargeable power supply during normal operation of the power supply object. A standby control signal triggered when the power supply object is in standby mode controls the first switching circuit to turn off, which in turn controls the second switching circuit to turn off, thus achieving automatic power-off of the rechargeable power supply in standby mode. This extends the rechargeable power supply's battery life and avoids power waste. Simultaneously, when an external power source is connected to the power supply object's external power interface, the first switching circuit is turned on, which in turn controls the second switching circuit to return to the on state, enabling external power to charge the rechargeable power supply in standby mode. After the external power supply is removed, the first switching circuit turns off again, which in turn controls the second switching circuit to turn off, restoring the rechargeable power supply to its automatic power-off state in standby mode. The power supply control circuit provided in this embodiment achieves power supply control between the rechargeable power supply and the power supply object through a hardware circuit signal self-drive method. It eliminates the need for additional external control signals and controllers, and does not require modification of existing controller circuits. Simply placing this power supply control circuit between the rechargeable power supply and the power supply object significantly reduces production costs.

[0012] In one optional embodiment, the second switching circuit includes: a controlled switch, which is a P-type field-effect transistor, wherein the source of the P-type field-effect transistor is connected to the rechargeable power supply, the drain is connected to the internal power supply interface of the power supply object, and the gate is connected to the voltage output terminal of the voltage divider circuit.

[0013] By utilizing the principle that the P-type field-effect transistor generates a voltage drop due to its own impedance when it is turned on, the comparator circuit is driven to work, realizing the automatic switching function between charging the rechargeable power supply in standby mode and continuing to use the power supply after power failure. Only one switching device, the P-type field-effect transistor, is needed, making the circuit structure simpler and further reducing production costs.

[0014] In one optional implementation, the first switching circuit includes: a first controlled switch and a second controlled switch;

[0015] The first terminal of the first controlled switch is connected to the ground terminal of the voltage divider circuit and the first terminal of the second controlled switch, respectively. The second terminal is connected to the second terminal of the second controlled switch and then grounded. The control terminal is connected to the external power supply interface of the power supply object. The first controlled switch is turned on when there is external power supply access to the external power supply interface of the power supply object.

[0016] The control terminal of the second controlled switch receives the standby control signal of the power supply object, and the second controlled switch turns off when it receives the standby control signal.

[0017] By using two controlled switches to jointly control the circuit on and off, one controlled switch is turned off when the power supply is in standby mode, and the other controlled switch is turned on when the power supply is supplied with external power. Thus, only two controlled switches are used to achieve automatic switching control between standby power supply and automatic charging of the rechargeable power supply. The circuit structure is simple and production costs are further reduced.

[0018] In one optional implementation, the second controlled switch is a mechanical switch, which is disposed on the power supply object and is triggered to turn off when the power supply object performs a standby action.

[0019] By utilizing the robust, durable, and low-cost characteristics of mechanical switches, the mechanical switch is automatically triggered to turn off when the powered object is in standby mode. In addition, the mechanical switch can be manually operated according to the actual needs of the product, so that the power supply can be manually cut off when the automatic standby control fails or according to the actual power supply endurance requirements, thus improving the flexibility of power supply cut-off control.

[0020] In one alternative implementation, the mechanical switch is a micro switch.

[0021] Due to their compact structure, ease of installation, reliable operation, and long service life, microswitches are advantageous for miniaturizing products and ensuring product stability when used as standby trigger switches.

[0022] In one alternative implementation, the first controlled switch is a transistor or a field-effect transistor.

[0023] By utilizing the characteristics of transistors, field-effect transistors, and other switches—small size, light weight, low power consumption, and low price—production costs can be reduced and circuit power consumption decreased.

[0024] In one alternative implementation, the second controlled switch is a normally closed switch.

[0025] By setting the second controlled switch as a normally closed switch, the rechargeable power supply can be automatically charged and power the object being supplied in normal mode, thus ensuring the stability of the product's power supply.

[0026] In one optional embodiment, the first switching circuit further includes a first resistor, one end of which is connected to the control terminal of the first switching circuit, and the other end of which is connected to the external power supply interface.

[0027] By setting a first resistor to filter the circuit, the first switching circuit is prevented from malfunctioning due to noise signals, thus ensuring the stability of circuit control.

[0028] In one optional embodiment, the power supply control circuit further includes: a first terminal and a second terminal.

[0029] The power supply control circuit is connected to the rechargeable power source through the first terminal block;

[0030] The power supply control circuit is connected to the internal power supply interface of the power supply object through the second terminal.

[0031] The installation of wiring terminals facilitates the connection of the power supply control circuit with the rechargeable power source and the object being powered, thus simplifying installation and maintenance.

[0032] In one alternative implementation, the rechargeable power source is a battery, and the power supply object is the motherboard of an electrical device.

[0033] Powering the motherboard of electrical devices with batteries reduces power costs.

[0034] In a second aspect, embodiments of the present invention provide an electrical device, including: a rechargeable power supply, a power supply object, and a power supply control circuit as described in the first aspect and any of its optional embodiments.

[0035] In one optional implementation, the electrical device is an electric fan, and the power supply is the electric fan motherboard.

[0036] In one optional embodiment, the electric fan is a foldable electric fan. When the second controlled switch in the second switching circuit is a micro switch, the micro switch is located at the folding part of the foldable electric fan and is triggered to turn off when the folding part is folded. Attached Figure Description

[0037] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the conventional control circuit structure between the battery and the motherboard in the existing technology;

[0039] Figure 2 This is a schematic diagram of the power supply control circuit according to an embodiment of the present invention;

[0040] Figure 3 This is a schematic diagram of the structure of an electrical device according to an embodiment of the present invention. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Currently, portable electronic devices are becoming increasingly common, such as portable electric fans. Due to the overall size limitations of these portable electronic devices, the size and capacity of their built-in batteries are generally not very large. In this case, it is necessary to consider not only the operating time that the battery can maintain when the device is working normally, but also the battery life in standby mode. This is to avoid the need for frequent charging when the user is not using the device, as well as the problem of the battery being damaged due to over-discharge when the user is not charging the device.

[0043] To extend battery standby time, two methods are typically used in related technologies:

[0044] First, increase battery capacity to extend battery life;

[0045] Secondly, a switch is added to cut off battery power when the equipment is not in use, reducing battery output and thus reducing losses.

[0046] Both of these solutions increase battery capacity but also increase size, which is detrimental to overall device assembly and fails to meet the design requirements for portability and miniaturization. While adding a switch can cut off battery power when the device is not in use, extending battery standby time, ensuring normal battery charging while cutting off power presents a new technical challenge.

[0047] For example, such as Figure 1 As shown, a control switch KEY1 is installed between the battery terminal CN3 and the motherboard terminal CN4. After the motherboard goes into standby mode, the power supply from the battery to the motherboard is cut off. When the control switch KEY1 is turned off, although the battery life can be extended and the battery wear can be reduced, the battery cannot be charged at this time.

[0048] To address the above problems, embodiments of the present invention provide a power supply control circuit, such as... Figure 2 As shown, the power supply control circuit includes: a first switching circuit 101, a voltage divider circuit 102, and a second switching circuit 103;

[0049] The voltage input terminal of the voltage divider circuit 102 is connected to the rechargeable power supply, the voltage output terminal is connected to the control terminal of the second switching circuit 103, and the ground terminal is connected to the first terminal of the first switching circuit 101.

[0050] The first control terminal of the first switching circuit 101 is connected to the external power supply interface of the power supply object, the second control terminal receives the standby control signal of the power supply object, and the second terminal is grounded.

[0051] The first end of the second switching circuit 103 is connected to the rechargeable power supply, and the second end is connected to the internal power supply interface of the power supply object.

[0052] The first switch circuit 101 is turned on when no standby control signal is received or when the external power supply interface is connected to external power, and is turned off when a standby control signal is received and the external power supply interface is not connected to external power. The second switch circuit 103 has the same on state as the first switch circuit 101.

[0053] For example, such as Figure 2 As shown, the rechargeable power source is a battery. The power supply is the motherboard of the electrical appliance. Taking an electric fan as an example, the power supply is the fan's motherboard, and the external power source is the fan's adapter. This is achieved by plugging the adapter into the external power supply interface to provide external power to the fan. Powering the motherboard of the electrical appliance with a battery results in lower power supply costs.

[0054] This invention utilizes a second switching circuit to power and charge the internal rechargeable power supply during normal operation of the power supply object. A standby control signal triggered when the power supply object is in standby mode controls the first switching circuit to turn off, which in turn controls the second switching circuit to turn off, thus achieving automatic power-off of the rechargeable power supply in standby mode. This extends the rechargeable power supply's battery life and avoids power waste. Simultaneously, when an external power source is connected to the power supply object's external power interface, the first switching circuit is turned on, which in turn controls the second switching circuit to return to the on state, enabling external power to charge the rechargeable power supply in standby mode. After the external power supply is removed, the first switching circuit turns off again, which in turn controls the second switching circuit to turn off, restoring the rechargeable power supply to its automatic power-off state in standby mode. The power supply control circuit provided in this embodiment achieves power supply control between the rechargeable power supply and the power supply object through a hardware circuit signal self-drive method. It eliminates the need for additional external control signals and controllers, and does not require modification of existing controller circuits. Simply placing this power supply control circuit between the rechargeable power supply and the power supply object significantly reduces production costs.

[0055] In some optional embodiments, the second switching circuit 103 includes: a controlled switch, which is a P-type field-effect transistor Q1, the source of which is connected to a rechargeable power supply, the drain of which is connected to the internal power supply interface of the power supply object, and the gate of which is connected to the voltage output terminal of the voltage divider circuit 102.

[0056] By utilizing the principle that the P-type field-effect transistor generates a voltage drop due to its own impedance when it is turned on, the comparator circuit is driven to work, realizing the automatic switching function between charging the rechargeable power supply in standby mode and continuing to use the power supply after power failure. Only one switching device, the P-type field-effect transistor, is needed, making the circuit structure simpler and further reducing production costs.

[0057] It should be noted that in practical applications, the above-mentioned controlled switch can also be composed of switches with conduction voltage drop, such as IGBT devices, and their peripheral circuits. The specific controllable switch model selection and peripheral circuit design can be flexibly set according to actual needs, as long as the power supply control of the rechargeable power supply and the powered object can be realized. This invention is not limited to this.

[0058] In some alternative implementations, the first switching circuit 101 includes: a first controlled switch and a second controlled switch;

[0059] The first terminal of the first controlled switch is connected to the ground terminal of the voltage divider circuit 102 and the first terminal of the second controlled switch, respectively. The second terminal is connected to the second terminal of the second controlled switch and then grounded. The control terminal is connected to the external power supply interface of the power supply object. The first controlled switch is turned on when there is external power supply access to the external power supply interface of the power supply object.

[0060] The control terminal of the second controlled switch receives the standby control signal from the power supply object, and the second controlled switch turns off when it receives the standby control signal.

[0061] By using two controlled switches to jointly control the circuit on and off, one controlled switch is turned off when the power supply is in standby mode, and the other controlled switch is turned on when the power supply is supplied with external power. Thus, only two controlled switches are used to achieve automatic switching control between standby power supply and automatic charging of the rechargeable power supply. The circuit structure is simple and production costs are further reduced.

[0062] In some alternative implementations, such as Figure 2 As shown, the second controlled switch is a mechanical switch K1, which is installed on the power supply object. When the power supply object performs a standby action, the mechanical switch K1 is triggered to turn off.

[0063] By utilizing the robust, durable, and low-cost characteristics of mechanical switches, the mechanical switch is automatically triggered to turn off when the powered object is in standby mode. In addition, the mechanical switch can be manually operated according to the actual needs of the product, so that the power supply can be manually cut off when the automatic standby control fails or according to the actual power supply endurance requirements, thus improving the flexibility of power supply cut-off control.

[0064] For example, the mechanical switch K1 is a micro switch.

[0065] Due to their compact structure, ease of installation, reliable operation, and long service life, microswitches are advantageous for miniaturizing products and ensuring product stability when used as standby trigger switches.

[0066] It should be noted that the use of a micro switch in the K1 mechanical switch is only an example. Depending on the usage scenario, a suitable switch type can be selected. For example, when using a micro switch, it can adapt to the unfolded and folded state of the whole machine's folding structure, automatically triggering the micro switch to close and open without any additional operation. If the whole machine does not have a folding structure, a toggle switch can also be used, which can be manually operated to achieve conduction and disconnection. Since the user does not need to remember the switch state when using a micro switch (or a switch of the same type), it only automatically switches according to the state of the whole machine, resulting in a better user experience.

[0067] Furthermore, in practical applications, the aforementioned second controlled switch can also be an electronic switch, such as a transistor or a MOSFET. Taking a transistor as an example, by connecting the base of the transistor to a high-level signal to keep it in a normally closed state, and connecting the base to the power supply controller, the controller sends a low-level signal to the base of the transistor to control the transistor to turn off when it detects that the power supply is in standby mode. This achieves automatic standby control of turning off the first switch circuit 101 and the second switch circuit 103 to disconnect the power supply connection between the battery and the motherboard. This invention is not limited to this.

[0068] In some alternative implementations, the first controlled switch is a transistor or a field-effect transistor. For example, such as... Figure 2 The illustration uses an NPN transistor Q2 as the first controlled switch. In practical applications, other switching devices with the same turn-on and turn-off logic, such as NMOS transistors, can also be used. This invention is not limited to this.

[0069] By utilizing the characteristics of transistors, field-effect transistors, and other switches—small size, light weight, low power consumption, and low price—production costs can be reduced and circuit power consumption decreased.

[0070] Specifically, the second controlled switch is a normally closed switch.

[0071] By setting the second controlled switch as a normally closed switch, the rechargeable power supply can be automatically charged and power the object being supplied in normal mode, thus ensuring the stability of the product's power supply.

[0072] In some optional embodiments, the first switching circuit 101 further includes a first resistor R3, one end of which is connected to the control terminal of the first switching circuit 101, and the other end is connected to an external power supply interface.

[0073] By setting a first resistor to filter the circuit, the first switching circuit is prevented from malfunctioning due to noise signals, thus ensuring the stability of circuit control.

[0074] In some alternative implementations, such as Figure 2 As shown, the voltage divider circuit 102 includes a second resistor R1 and a third resistor R2. One end of the second resistor R1 is connected to a rechargeable power supply, and the other end is connected to one end of the third resistor R2 and the control terminal of the second switching circuit 103. The other end of the third resistor R2 is connected to the first terminal of the first switching circuit 101.

[0075] It should be noted that in practical applications, the voltage divider circuit 102 can also be selected from other circuit structures, as long as it can achieve the function of voltage divider output. This invention is not limited to this.

[0076] In some optional embodiments, the power supply control circuit further includes: a first terminal CON1 and a second terminal CON2.

[0077] The power supply control circuit is connected to the rechargeable power source through the first terminal CON1;

[0078] The power supply control circuit is connected to the internal power supply interface of the object being powered through the second terminal CON2.

[0079] The installation of wiring terminals facilitates the connection of the power supply control circuit with the rechargeable power source and the object being powered, thus simplifying installation and maintenance.

[0080] In addition, such as Figure 2 As shown, the external power supply is also connected to the external power supply interface of the object being powered through the second terminal CON2. Taking the motherboard of the electrical device as an example, the external power supply supplies power to the motherboard, and then charges the rechargeable power supply through the power conversion circuit set on the motherboard and the internal power supply interface. The external power supply charging the rechargeable power supply through the motherboard is existing technology and will not be described in detail here.

[0081] The working principle and process of the power supply control circuit provided in the embodiments of the present invention will be explained in detail below with reference to specific application examples.

[0082] For example Figure 2 Taking the power supply control circuit shown as an example, CON1 is connected to a rechargeable power source, which is a battery, and VBAT is the positive terminal of the battery. CON2 is connected to the internal power supply interface of the motherboard for the electric fan, and BAT+OUT is the positive terminal of the motherboard. VIN is the voltage of the external adapter. When an adapter is connected to the machine, VIN is the voltage of the adapter; when no adapter is connected, VIN is 0V. Figure 2 As shown, Q1 is a PMOS transistor (P-type field-effect transistor), with its drain (D) connected to the positive terminal of the motherboard, its source (S) connected to the positive terminal of the battery, and its gate (G) connected to one end of resistor R2. Resistor R1 is connected in parallel between G and S. K1 is a mechanical switch on the positive terminal. Q2 is an NPN transistor, with its collector connected to K1 and one end of R2, its emitter grounded, and its base connected to VIN through R3.

[0083] When K1 is closed, one end of R2 is connected to ground. The voltage of the battery's positive terminal VBAT is divided by R1 and R2. When R1 and R2 are properly selected, the voltage Vgs (voltage across R1) of Q1 meets the conduction condition, and Q1 conducts. At this time, VBAT is connected to the positive terminal of the motherboard, the battery can supply power to the motherboard, and the motherboard can also charge the battery through BAT+OUT.

[0084] When K1 is disconnected and no adapter is connected (VIN=0V), R2 is disconnected from ground, Q1's Vgs (voltage across R1) is 0, Q1 cannot conduct, VBAT and BAT+OUT are disconnected, the battery cannot supply power to the motherboard, and the battery power consumption is at its lowest at this time.

[0085] When K1 is open, and the adapter is plugged in (VIN is the adapter voltage, e.g., 5V), VIN controls transistor Q2 to conduct via R3. Even if K1 is open, one end of R2 will still be connected to ground, causing Q1 to conduct, similar to when K1 is closed. The battery's positive terminal VBAT is connected to the motherboard's positive terminal, allowing the battery to power the motherboard, and the motherboard to charge the battery via BAT+OUT. This achieves the function of charging the battery when the adapter is plugged in, even when K1 is off, in standby mode to reduce battery power consumption. Furthermore, this solution does not require external main control chip I / O ports for control.

[0086] Mechanical switch K1 is connected in parallel with Q2, driven by the adapter voltage signal on the motherboard, thereby controlling the on / off state of Q1. When mechanical switch K1 is closed, Q1 conducts, connecting the battery to the motherboard, allowing the battery to discharge to the motherboard and the motherboard to charge the battery. When an adapter is plugged in, the adapter voltage signal controls Q2 to conduct, which in turn controls Q1 to conduct, connecting the battery to the motherboard, allowing the battery to discharge to the motherboard and the motherboard to charge the battery. In this case, it is not limited by the state of mechanical switch K1; even without changing the state of mechanical switch K1, the motherboard can still charge the battery, and the battery can still discharge to the motherboard. This solution solves the problem without adding unnecessary chip I / O port resources for control compared to conventional solutions.

[0087] According to embodiments of the present invention, an electrical device is provided, such as... Figure 3 As shown, the electrical device includes: a rechargeable power supply 201, a power supply object 202, and a power supply control circuit 203 provided in another embodiment of the present invention.

[0088] The electrical equipment provided in this invention realizes power supply control between the rechargeable power supply and the electrical equipment through a hardware circuit signal self-drive method. It does not require the addition of external control signals and controllers, nor does it require modification of the existing controller circuit. It only needs to set the power supply control circuit between the rechargeable power supply and the electrical equipment, which greatly reduces production costs.

[0089] The electrical equipment provided in this invention realizes power supply control between the rechargeable power supply and the electrical equipment through a hardware circuit signal self-drive method. It does not require the addition of external control signals and controllers, nor does it require modification of the existing controller circuit. It only needs to set the power supply control circuit between the rechargeable power supply and the electrical equipment, which greatly reduces production costs.

[0090] Specifically, the electrical device is an electric fan, the power supply object 202 is the electric fan mainboard, and the rechargeable power supply 201 is a battery. For the specific structure and working principle of the power supply control circuit 203, please refer to the relevant description in the above-described power supply control circuit embodiment, which will not be repeated here.

[0091] By utilizing a power supply control circuit, the power supply between the fan power supply and the fan motherboard is controlled, which extends the power supply life of the fan and enables automatic switching between power outage recovery and charging, reducing the production cost of the fan and improving the user experience.

[0092] In some alternative implementations, the electric fan is a foldable electric fan. When the second controlled switch in the second switching circuit is a micro switch, the micro switch is located at the folding part of the foldable electric fan and is triggered to conduct when the folding part is folded.

[0093] By utilizing the fact that the electric fan is in a non-working state when folded, it can adapt to the unfolding and folding states of the entire machine's folding structure, automatically triggering the micro switch to close and open without any additional operation, thus further enhancing the user experience.

[0094] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A power supply control circuit, characterized in that, include: First switching circuit, voltage divider circuit, and second switching circuit; The voltage input terminal of the voltage divider circuit is connected to the rechargeable power supply, the voltage output terminal is connected to the control terminal of the second switching circuit, and the ground terminal is connected to the first terminal of the first switching circuit. The first control terminal of the first switching circuit is connected to the external power supply interface of the power supply object, the second control terminal receives the standby control signal of the power supply object, and the second terminal is grounded. The first end of the second switching circuit is connected to the rechargeable power supply, and the second end is connected to the internal power supply interface of the power supply object. The first switching circuit is turned on when it does not receive the standby control signal or when the external power supply interface is connected to external power, and is turned off when it receives the standby control signal and the external power supply interface is not connected to external power. The second switching circuit has the same on state as the first switching circuit.

2. The power supply control circuit according to claim 1, characterized in that, The second switching circuit includes: a controlled switch, which is a P-type field-effect transistor. The source of the P-type field-effect transistor is connected to the rechargeable power supply, the drain is connected to the internal power supply interface of the power supply object, and the gate is connected to the voltage output terminal of the voltage divider circuit.

3. The power supply control circuit according to claim 1, characterized in that, The first switching circuit includes: a first controlled switch and a second controlled switch; The first terminal of the first controlled switch is connected to the ground terminal of the voltage divider circuit and the first terminal of the second controlled switch, respectively. The second terminal is connected to the second terminal of the second controlled switch and then grounded. The control terminal is connected to the external power supply interface of the power supply object. The first controlled switch is turned on when there is external power supply access to the external power supply interface of the power supply object. The control terminal of the second controlled switch receives the standby control signal of the power supply object, and the second controlled switch turns off when it receives the standby control signal.

4. The power supply control circuit according to claim 3, characterized in that, The second controlled switch is a mechanical switch, which is installed on the power supply object and is triggered to turn off when the power supply object performs a standby action.

5. The power supply control circuit according to claim 4, characterized in that, The mechanical switch is a micro switch.

6. The power supply control circuit according to claim 4, characterized in that, The first controlled switch is a transistor or a field-effect transistor.

7. The power supply control circuit according to any one of claims 3-5, characterized in that, The second controlled switch is a normally closed switch.

8. The power supply control circuit according to any one of claims 1-6, characterized in that, The first switching circuit further includes a first resistor, one end of which is connected to the control terminal of the first switching circuit, and the other end of which is connected to the external power supply interface.

9. The power supply control circuit according to any one of claims 1-6, characterized in that, Also includes: First terminal and second terminal The power supply control circuit is connected to the rechargeable power source through the first terminal block; The power supply control circuit is connected to the internal power supply interface of the power supply object through the second terminal.

10. The power supply control circuit according to any one of claims 1-6, characterized in that, The rechargeable power source is a battery, and the power supply object is the motherboard of the electrical device.

11. An electrical appliance, characterized in that, include: A rechargeable power supply, a power supply object, and a power supply control circuit as described in any one of claims 1-10.

12. The electrical equipment according to claim 11, characterized in that, The electrical device is an electric fan, and the power supply is the electric fan motherboard.

13. The electrical equipment according to claim 12, characterized in that, The first switching circuit includes: a first controlled switch and a second controlled switch; the first terminal of the first controlled switch is connected to the ground terminal of the voltage divider circuit and the first terminal of the second controlled switch, respectively, and the second terminal is connected to the second terminal of the second controlled switch and then grounded; the control terminal is connected to the external power supply interface of the power supply object; the first controlled switch is turned on when there is external power supply access to the external power supply interface of the power supply object; the control terminal of the second controlled switch receives the standby control signal of the power supply object, and the second controlled switch is turned off when it receives the standby control signal; the electric fan is a foldable electric fan, and when the second controlled switch in the first switching circuit is a micro switch, the micro switch is located at the folding part of the foldable electric fan, and the micro switch is triggered to turn off when the folding part is folded.

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