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 and a second switching circuit. The first end of the first switching circuit is connected with a chargeable power supply, the second end is connected with the control end of the second switching circuit, the first control end is connected with the external power supply interface of a power supply object, and the second control end receives the standby control signal of the power supply object. 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 circuit realizes the power supply control between the chargeable power supply and the power supply object in a self-driving mode of a hardware circuit signal, does not need to increase external control signals and controllers, does not need to change the existing controller circuit, and 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 and a second switching circuit;

[0007] The first terminal of the first switching circuit is connected to the rechargeable power supply, the second terminal is connected to the control terminal of the second switching circuit, the first control terminal is connected to the external power supply interface of the power supply object, and the second control terminal receives the standby control signal of the power supply object.

[0008] 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.

[0009] The first switching circuit is turned on when it receives the standby control signal and the external power supply interface is not connected to an external power supply, and turned off when it does not receive the standby control signal or the external power supply interface is connected to an external power supply. The power supply voltage of the external power supply interface is greater than the power supply voltage of the rechargeable power supply. The second switching circuit is turned off when the first switching circuit is turned on.

[0010] 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 on, which in turn controls the second switching circuit to turn off, thus automatically powering off the rechargeable power supply during standby. This extends the rechargeable power supply's battery life and avoids wasting power. Simultaneously, when an external power source is connected to the power supply object's external power interface, the first switching circuit is turned off, which in turn controls the second switching circuit to turn on again, enabling the external power supply to charge the rechargeable power supply during standby. When the external power supply is removed, the first switching circuit turns on again, which in turn controls the second switching circuit to turn off, restoring the rechargeable power supply to its automatic power-off state during standby. 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.

[0011] 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 second terminal of the first switching circuit.

[0012] 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.

[0013] In one optional implementation, the first switching circuit includes: a first controlled switch and a second controlled switch;

[0014] The first terminal of the first controlled switch is connected to the rechargeable power supply, the second terminal is connected to the first terminal of the second controlled switch, and the control terminal is connected to the external power supply interface of the power supply object. The first controlled switch is disconnected when the external power supply interface of the power supply object is connected to external power.

[0015] The second terminal of the second controlled switch is connected to the control terminal of the second switch circuit. The control terminal receives the standby control signal of the power supply object, and the second controlled switch is turned on when it receives the standby control signal.

[0016] By using two controlled switches to jointly control the circuit on and off, one controlled switch is turned on when the power supply is in standby mode, and the other controlled switch is turned off 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.

[0017] 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 on when the power supply object performs a standby action.

[0018] By utilizing the robust, durable, and low-cost characteristics of mechanical switches, the mechanical switches are automatically triggered to conduct when the powered object is in standby mode. In addition, the mechanical switches 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.

[0019] In one alternative implementation, the mechanical switch is a micro switch.

[0020] 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.

[0021] In one alternative implementation, the first controlled switch is a transistor or a field-effect transistor.

[0022] 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.

[0023] In one optional implementation, the power supply control circuit further includes:

[0024] The voltage divider circuit has its voltage input terminal connected to the external power supply interface of the power supply object, and its voltage output terminal connected to the first control terminal of the first switching circuit.

[0025] Thus, the voltage divider circuit provides the required voltage control signal to the first switching circuit, ensuring the reliability of the first switching circuit's conduction control.

[0026] In one alternative embodiment, the second switching circuit further includes a first resistor, one end of which is connected to the gate of the P-type field-effect transistor, and the other end is grounded.

[0027] By setting the first resistor to provide a bias voltage for the MOSFET, external interference signals are prevented from triggering it falsely. At the same time, it acts as a bleed resistor to protect the MOSFET from being damaged by high voltage.

[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, the present invention also provides an electrical device, comprising: a rechargeable power supply, a power supply object, and a power supply control circuit as provided in the first aspect and any alternative embodiment thereof.

[0035] 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.

[0036] In one optional implementation, the electrical device is an electric fan, and the power supply is the electric fan motherboard.

[0037] 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.

[0038] In one optional embodiment, the electric fan is a foldable electric fan. When the first 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 the micro switch is triggered to conduct when the folding part is folded.

[0039] 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. Attached Figure Description

[0040] 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.

[0041] Figure 1 This is a schematic diagram of the conventional control circuit structure between the battery and the motherboard in the existing technology;

[0042] Figure 2 This is a schematic diagram of the power supply control circuit according to an embodiment of the present invention;

[0043] Figure 3 This is a schematic diagram of the structure of an electrical device according to an embodiment of the present invention. Detailed Implementation

[0044] 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.

[0045] 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.

[0046] To extend battery standby time, two methods are typically used in related technologies:

[0047] First, increase battery capacity to extend battery life;

[0048] Secondly, a switch is added to cut off battery power when the equipment is not in use, reducing battery output and thus reducing losses.

[0049] 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.

[0050] For example, such as Figure 1 As shown, a control switch K1 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 K1 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.

[0051] 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 and a second switching circuit 102;

[0052] The first terminal of the first switching circuit 101 is connected to the rechargeable power supply, the second terminal is connected to the control terminal of the second switching circuit 102, the first control terminal is connected to the external power supply interface of the power supply object, and the second control terminal receives the standby control signal of the power supply object.

[0053] The first end of the second switching circuit 102 is connected to the rechargeable power supply, and the second end is connected to the internal power supply interface of the power supply object.

[0054] The first switching circuit 101 is turned on when it receives a standby control signal and the external power supply interface is not connected to an external power supply, and turned off when it does not receive a standby control signal or the external power supply interface is connected to an external power supply. The power supply voltage of the external power supply interface is greater than the power supply voltage of the rechargeable power supply. The second switching circuit 102 is turned off when the first switching circuit 101 is turned on.

[0055] For example, the rechargeable power source is a battery. The power supply is the motherboard of an 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. That is, the external power supply for the fan is achieved by plugging the adapter into the external power supply interface. Powering the motherboard of the electrical appliance with a battery results in lower power supply costs.

[0056] 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 on, which in turn controls the second switching circuit to turn off, thus automatically powering off the rechargeable power supply during standby. This extends the rechargeable power supply's battery life and avoids wasting power. Simultaneously, when an external power source is connected to the power supply object's external power interface, the first switching circuit is turned off, which in turn controls the second switching circuit to turn on again, enabling the external power supply to charge the rechargeable power supply during standby. When the external power supply is removed, the first switching circuit turns on again, which in turn controls the second switching circuit to turn off, restoring the rechargeable power supply to its automatic power-off state during standby. 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.

[0057] In some optional embodiments, the second switching circuit 102 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 second terminal of the first switching circuit 101.

[0058] 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.

[0059] 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.

[0060] In some alternative implementations, the first switching circuit 101 includes: a first controlled switch and a second controlled switch;

[0061] The first terminal of the first controlled switch is connected to the rechargeable power supply, the second terminal is connected to the first terminal of the second controlled switch, and the control terminal is connected to the external power supply interface of the power supply object. The first controlled switch is disconnected when an external power supply is connected to the external power supply interface of the power supply object.

[0062] The second terminal of the second controlled switch is connected to the control terminal of the second switch circuit 102. The control terminal receives the standby control signal of the power supply object, and the second controlled switch is turned on when it receives the standby control signal.

[0063] By using two controlled switches to jointly control the circuit on and off, one controlled switch is turned on when the power supply is in standby mode, and the other controlled switch is turned off 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.

[0064] In some alternative implementations, the second controlled switch is a mechanical switch, which is disposed on the power supply object and is triggered to conduct when the power supply object performs a standby action.

[0065] By utilizing the robust, durable, and low-cost characteristics of mechanical switches, the mechanical switches are automatically triggered to conduct when the powered object is in standby mode. In addition, the mechanical switches 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.

[0066] For example, such as Figure 2 As shown, the mechanical switch is a micro switch KEY1.

[0067] Due to its compact structure, ease of installation, reliable operation, and long service life, the micro switch KEY1 is ideal for miniaturizing products and ensuring product stability when used as a standby trigger switch.

[0068] It should be noted that the selection of micro switch KEY1 as a mechanical switch is only for illustrative purposes. Depending on the different usage scenarios, appropriate switch types can be selected. For example, when using micro switch KEY1, 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 to achieve conduction and disconnection through manual operation. Since the user does not need to remember the switch state when using micro switch KEY1 (or a switch of the same type), and it only switches automatically according to the state of the whole machine, the actual user experience is better.

[0069] 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 the power supply controller, the controller sends a high-level signal to the base of the transistor to control the transistor to conduct when it detects that the power supply is in standby mode. This achieves automatic standby control of turning on the first switch circuit and turning off the second switch circuit to disconnect the power supply connection between the battery and the motherboard. This invention is not limited to this.

[0070] 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 PMOS transistor Q2 as the first controlled switch. In practical applications, other switching devices with the same turn-on and turn-off logic, such as PNP transistors, can also be used. This invention is not limited to this.

[0071] 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.

[0072] In some alternative implementations, such as Figure 2 As shown, the second switching circuit 102 further includes a first resistor R50, one end of which is connected to the gate of the P-type field-effect transistor Q1, and the other end is grounded.

[0073] By setting the first resistor to provide a bias voltage for the MOSFET, external interference signals are prevented from triggering it falsely. At the same time, it acts as a bleed resistor to protect the MOSFET from being damaged by high voltage.

[0074] In some alternative implementations, the power supply control circuit further includes:

[0075] Voltage divider circuit 103, the voltage input terminal of voltage divider circuit 103 is connected to the external power supply interface of the power supply object, and the voltage output terminal is connected to the first control terminal of first switch circuit 101.

[0076] Thus, the voltage divider circuit 103 provides the required voltage control signal to the first switching circuit, ensuring the reliability of the conduction control of the first switching circuit.

[0077] like Figure 2 As shown, the voltage divider circuit 103 is composed of a second resistor R1 and a third resistor R2. One end of the second resistor R1 is connected to the external power supply interface of the power supply object, and the other end is connected to one end of the third resistor R2 and the first control terminal of the first switch circuit 101. The other end of the third resistor R2 is grounded.

[0078] It should be noted that in practical applications, the voltage divider circuit 103 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.

[0079] In some optional embodiments, the power supply control circuit further includes: a first terminal CN1 and a second terminal CN2.

[0080] The power supply control circuit is connected to the rechargeable power source via the first terminal CN1;

[0081] The power supply control circuit is connected to the internal power supply interface of the object being powered through the second terminal CN2.

[0082] 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.

[0083] 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 CN2. 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.

[0084] 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.

[0085] For example Figure 2 Taking the power supply control circuit shown as an example, CN1 is connected to a rechargeable power source, which is a battery, and CN2 is connected to the internal power supply interface of the motherboard for the electric fan. Figure 2 As shown, point A is the positive terminal of the battery, point B is the positive terminal of the motherboard, VIN is the positive terminal of the external adapter (also on the motherboard; VIN is energized when an adapter is plugged into the motherboard, and de-energized when no adapter is plugged into the motherboard), CON1 is a terminal block used to connect the battery to the power supply control circuit of this embodiment, CN2 is also a terminal block used to connect the power supply control circuit of this embodiment to the motherboard, Q1 and Q2 are field-effect transistors, KEY1 is a microswitch, and R1 (current limiting and voltage dividing), R2 (current limiting and voltage dividing), and R50 (current limiting) are resistors. VIN is the adapter input voltage. VIN is stepped down by the charging circuit of the motherboard to charge the battery, and the voltage of VIN must be greater than the voltage at point A. This embodiment of the invention uses a single battery as an example (battery voltage 3-4.2V), and the motherboard outputs 5V to charge the battery. Simultaneously, the values ​​of R1 and R2 must be selected to ensure that when VIN is energized, the voltage at the gate of Q2 is greater than the voltage at point A.

[0086] This invention adds a micro switch KEY1. When the user is not using the device (e.g., when it is stored or in standby mode), the micro switch KEY1 is touched when the overall state of the device changes (e.g., when it is stored or folded), causing the micro switch KEY1 to change state. In this solution, a normally open switch is used. After the device is stored, KEY1 closes and conducts.

[0087] When KEY1 is off, the gate of the P-type field-effect transistor Q1 is grounded through R50. At the same time, since point A is the positive terminal of the battery, the source of Q1 is connected to point A. Therefore, the voltage VGS between the gate and source of the P-type field-effect transistor Q1 is less than 0. Thus, the P-type field-effect transistor Q1 is turned on, and the battery can discharge to the motherboard through Q1, and the motherboard can also charge the battery through Q1.

[0088] When KEY1 is turned on, if no adapter is plugged into the motherboard, there is no voltage at VIN. The gate of Q2 is grounded through R2. At the same time, since point A is the positive terminal of the battery, the source of Q2 is connected to point A. Therefore, the voltage between the gate and source of Q2, VGS, is less than 0, so Q2 is also turned on. At this time, point A is connected to the gate of Q1 through Q2 and KEY1. The voltage between the gate and source of Q2, VGS, is 0. Therefore, the P-type field-effect transistor Q1 is turned off, and the battery cannot supply power to the motherboard.

[0089] When KEY1 is turned on, if an adapter is plugged into the motherboard, there will be voltage on VIN. VIN passes through R1 to the gate of Q2 and then to ground through R2. At this time, the gate voltage of Q2 is greater than the voltage at point A. Since point A is the positive terminal of the battery, and the source (S) of Q2 is connected to point A, the voltage between the gate and source of Q2, VGS, is greater than 0, so Q2 is turned off. At this time, the gate of the P-type field-effect transistor Q1 is grounded through R50. Also, since point A is the positive terminal of the battery, and the source of Q1 is connected to point A, the voltage between the gate and source of the P-type field-effect transistor Q1, VGS, is less than 0, so the P-type field-effect transistor Q1 is turned on. The battery can discharge to the motherboard through Q1, and the motherboard can also charge the battery through Q1. Furthermore, this solution does not require external main control chip I / O ports for control.

[0090] By configuring Q1, when Q1 is off, the battery can discharge to the motherboard, and if an adapter is plugged in, the adapter can also charge the battery through the motherboard. When Q1 is on, the battery cannot discharge to the motherboard, but if the switch is on and an adapter is plugged in, the adapter can also charge the battery through the motherboard. After disconnecting the battery from the motherboard by controlling KEY1, as long as an adapter is plugged in, the motherboard can charge the battery, and the battery can discharge to the motherboard, even without changing the switch state of KEY1. This solves the problem without requiring additional chip I / O port resources for control compared to conventional solutions.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] In some alternative implementations, the electric fan is a foldable electric fan. When the first 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.

[0097] 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.

[0098] 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 by comprising: include: First switching circuit and second switching circuit; The first terminal of the first switching circuit is connected to the rechargeable power supply, the second terminal is connected to the control terminal of the second switching circuit, the first control terminal is connected to the external power supply interface of the power supply object, and the second control terminal receives the standby control signal of the power supply object. 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 receives the standby control signal and the external power supply interface is not connected to an external power supply, and turned off when it does not receive the standby control signal or the external power supply interface is connected to an external power supply. The power supply voltage of the external power supply interface is greater than the power supply voltage of the rechargeable power supply. The second switching circuit is turned off when the first switching circuit is turned on.

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 second terminal of the first switching 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 rechargeable power supply, the second terminal is connected to the first terminal of the second controlled switch, and the control terminal is connected to the external power supply interface of the power supply object. The first controlled switch is disconnected when the external power supply interface of the power supply object is connected to external power. The second terminal of the second controlled switch is connected to the control terminal of the second switch circuit. The control terminal receives the standby control signal of the power supply object, and the second controlled switch is turned on 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 disposed on the power supply object and is triggered to turn on 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 3, characterized in that, The first controlled switch is a transistor or a field-effect transistor.

7. The power supply control circuit according to claim 1, characterized in that, Also includes: The voltage divider circuit has its voltage input terminal connected to the external power supply interface of the power supply object, and its voltage output terminal connected to the first control terminal of the first switching circuit.

8. The power supply control circuit according to claim 2, characterized in that, The second switching circuit further includes a first resistor, one end of which is connected to the gate of the P-type field-effect transistor, and the other end is grounded.

9. The power supply control circuit according to any one of claims 1-8, 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 1-8, 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; a first terminal of the first controlled switch is connected to the rechargeable power supply, a second terminal is connected to the first terminal of the second controlled switch, and a control terminal is connected to the external power supply interface of the power supply object; the first controlled switch is disconnected when an external power supply is connected to the external power supply interface of the power supply object; the second terminal of the second controlled switch is connected to the control terminal of the second switching circuit, and the control terminal receives the standby control signal of the power supply object; the second controlled switch is turned on when the standby control signal is received; the electric fan is a foldable electric fan; when the first 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 on when the folding part is folded.

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