Energy-saving control circuit and handheld fan

Abstract

The utility model discloses an energy-saving control circuit and a handheld fan, the handheld fan comprises a motor, the energy-saving control circuit comprises a key interface circuit used for connecting a power supply, and the key interface circuit is used for outputting a key trigger signal when pressed by a user; a first timer; the input end of the main control circuit is connected with the key interface circuit, the output end of the main control circuit is connected with the motor, the main control circuit is electrically connected with the first timer, and the main control circuit is used for controlling the motor to work and controlling the first timer to start timing when receiving a key trigger signal; the first timer is used for outputting a first timing trigger signal to the main control circuit when timing time reaches first preset time; and the main control circuit is used for controlling the key interface circuit to disconnect the electric connection between the power supply and the motor when the first timing trigger signal is received. According to the handheld fan, the function that the handheld fan can be controlled to be disconnected from the power supply without a power switch is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic circuit field especially relates to a kind of energy-saving control circuit and handheld fan. BACKGROUND

[0002] In high-temperature weather, handheld fan is more and more widely used, especially for people going out, handheld fan is convenient to carry.

[0003] And the current handheld fan at least needs to set wind speed button and switch button, when wind speed is adjusted to zero by wind speed button and handheld fan is not turned off by switch button, handheld fan will be in hibernation state, power consumption will also be generated at this time, and the layout requirement of handheld fan will also be increased by the setting of two buttons. SUMMARY

[0004] In view of the above deficiencies of prior art, the utility model aims at providing a kind of energy-saving control circuit and handheld fan, realize the function that handheld fan can be disconnected with power supply without power switch.

[0005] The technical scheme of the utility model is as follows:

[0006] A kind of energy-saving control circuit, it is applied to handheld fan, handheld fan includes motor, the energy-saving control circuit includes:

[0007] Key interface circuit, for connecting power supply, the key interface circuit is used to output button trigger signal when being pressed by user;

[0008] First timer;

[0009] Master control circuit, the input of the master control circuit is connected with the key interface circuit, the output of the master control circuit is connected with the motor, the master control circuit is electrically connected with the first timer, the master control circuit is used to control the motor work when receiving the button trigger signal, and the first timer starts timing;

[0010] The first timer is used to output first timing trigger signal to the master control circuit when timing time reaches first preset time;

[0011] The master control circuit is used to control the key interface circuit to disconnect the electrical connection between power supply and motor when receiving the first timing trigger signal.

[0012] Optionally, the key interface circuit includes:

[0013] Composite button;

[0014] Power input end, for connecting power supply;

[0015] a first switch tube, a controlled end of the first switch tube being connected with the composite key, an input end of the first switch tube being connected with the power input end, and an output end of the first switch tube being connected with the main control circuit;

[0016] The composite key is used to control the first switch tube to turn on the electrical connection between the power input end and the main control circuit when triggered, and output a key trigger signal to the main control circuit.

[0017] Optionally, the key interface circuit further comprises a first resistor, a second resistor, a first diode, a second diode and a first triode, a first end of the first resistor being connected with the main control circuit, a second end of the first resistor being connected with a first end of the second resistor and a base of the first triode, a second end of the second resistor and an emitter of the first triode being grounded, a collector of the first triode and an anode of the second diode being connected with the controlled end of the first switch tube, a cathode of the first diode being connected with a cathode of the second diode, and an anode of the first diode being connected with the main control circuit.

[0018] Optionally, the energy-saving control circuit further comprises:

[0019] a timing key, the timing key being used to output a timing trigger signal when pressed by a user;

[0020] a second timer, the second timer being electrically connected with the main control circuit;

[0021] an input end of the main control circuit being connected with the timing key, the main control circuit being used to adjust an automatic reload value of the second timer and control the second timer to start timing when the timing trigger signal is received;

[0022] the second timer being used to output a second timing trigger signal to the main control circuit when a timing time reaches a second preset time;

[0023] the main control circuit being further used to disconnect the electrical connection between the power supply and the motor when the second timing trigger signal is received.

[0024] Optionally, the energy-saving control circuit further comprises:

[0025] a digital display circuit, an input end of the digital display circuit being connected with an output end of the main control circuit, the main control circuit being used to control the digital display circuit to work when the second timing trigger signal is received.

[0026] Optionally, the main control circuit comprises:

[0027] A control chip, an input end of the control chip being connected with the key interface circuit, the control chip being electrically connected with the first timer, the control chip being used for outputting a motor control signal when receiving the key trigger signal, and controlling the first timer to start timing, and controlling the key interface circuit to disconnect the electrical connection between the power supply and the motor when receiving the first timing trigger signal;

[0028] A motor driving circuit, an input end of the motor driving circuit being connected with an output end of the control chip, a driving end of the motor driving being connected with the motor, the motor driving circuit being used for driving the motor to work when receiving the motor control signal.

[0029] Optionally, the energy-saving control circuit further comprises:

[0030] A motor current detection circuit, a detection end of the motor current detection circuit being connected with the motor, an output end of the motor current detection circuit being connected with the main control circuit, the motor current detection circuit being used for detecting the working current of the motor, and outputting a motor current detection signal to the main control circuit.

[0031] Optionally, the energy-saving control circuit further comprises:

[0032] A power supply voltage detection circuit, a detection end of the power supply voltage detection circuit being connected with the motor, an output end of the power supply voltage detection circuit being connected with the main control circuit, the power supply voltage detection circuit being used for detecting the power supply voltage of the motor, and outputting a power supply voltage detection signal to the main control circuit.

[0033] Optionally, the energy-saving control circuit further comprises:

[0034] A battery pack, connected with the main control circuit;

[0035] A battery voltage detection circuit, a detection end of the battery voltage detection circuit being connected with the battery pack, an output end of the battery voltage detection circuit being connected with the main control circuit, the battery voltage detection circuit being used for detecting the output voltage of the battery pack, and outputting a battery voltage detection signal to the main control circuit.

[0036] The utility model further provides a handheld fan, including motor and energy-saving control circuit as described above, the motor is connected with the main control circuit in the energy-saving control circuit.

[0037] This utility model's technical solution comprises an energy-saving control circuit using a button interface circuit, a first timer, and a main control circuit. The button interface circuit connects to the power supply. When pressed by the user, it outputs a button trigger signal to the main control circuit. The input terminal of the main control circuit is connected to the button interface circuit, and its output terminal is connected to the motor. The main control circuit is also electrically connected to the first timer. Upon receiving the button trigger signal, the main control circuit controls the motor to operate and starts the first timer. The first timer outputs a first timing trigger signal to the main control circuit when the timing reaches a first preset time. Upon receiving the first timing trigger signal, the main control circuit controls the button interface circuit to disconnect the power supply from the motor. Thus, this solution allows control of the motor in the handheld fan, thereby controlling the fan speed, using only one button in the button interface circuit. It also allows for on / off control of the handheld fan in conjunction with the first timer. A single button simplifies the layout of the handheld fan, and turning it off with a single button avoids the power consumption generated during the fan's sleep mode. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0039] Figure 1 This is a functional module schematic diagram of an embodiment of the energy-saving control circuit of this utility model.

[0040] Figure 2 This is a schematic diagram of the circuit structure of a button interface circuit in an embodiment of the energy-saving control circuit of this utility model.

[0041] Figure 3 This is a functional module schematic diagram of another embodiment of the energy-saving control circuit of this utility model.

[0042] Figure 4 This is a schematic diagram of the circuit structure of a digital display circuit in an embodiment of the energy-saving control circuit of this utility model.

[0043] Figure 5 This is a schematic diagram of the circuit structure of a motor drive circuit in an embodiment of the energy-saving control circuit of this utility model.

[0044] Figure 6 This is a schematic diagram of the circuit structure of a motor current detection circuit in an embodiment of the energy-saving control circuit of this utility model.

[0045] Figure 7It is a circuit structure schematic view of one embodiment of the power supply voltage detection circuit in the energy-saving control circuit.

[0046] Figure 8 It is a circuit structure schematic view of one embodiment of the battery voltage detection circuit in the energy-saving control circuit.

[0047] The figure mark explanation: 10, key interface circuit;20, main control circuit;30, first timer;40, timing key;50, second timer;R1, first resistance;R2, second resistance;D1, first diode;D2, second diode;Q1, first switch tube;Q4, first triode;SW1, composite key;JP5, power input end;BAT, battery pack. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical scheme and effect of the utility model more clear and definite, the utility model is further explained in detail below with reference to the drawings and examples.It should be understood that the specific embodiments described herein are only used to explain the utility model and not used to limit the utility model.

[0049] In the embodiments and patent application scope, unless the article has special limitation in the text, "a", "an", "said" and "the" can also include plural forms.If the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only used for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features.Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features.

[0050] It should be further understood that the phrase "comprising" used in the specification of the utility model means that the features, integers, steps, operations, elements and / or components exist, but does not exclude the existence or addition of one or more other features, integers, steps, operations, elements, components and / or their groups.It should be understood that when it is said that an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there can be intermediate elements.In addition, "connection" or "coupling" used herein can include wireless connection or wireless coupling.The phrase "and / or" used herein includes all or any unit and all combinations of the associated listed items.

[0051] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. It should also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0052] In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor is it within the protection scope required by the present application.

[0053] In high temperature weather, the use of handheld fans is becoming more and more widespread, especially for people going out, handheld fans are convenient to carry.

[0054] And the current handheld fan at least needs to set the wind speed key and the switch key, when the wind speed is adjusted to zero through the wind speed key and the handheld fan is not turned off through the switch key, the handheld fan will be in a dormant state, at this time, power consumption will also be generated, and the setting of the two keys will also increase the layout requirements of the handheld fan. In addition, the general handheld fan does not have the function of timing off.

[0055] To solve the above problems, the present application provides an energy-saving control circuit applied to a handheld fan, the handheld fan comprising a motor.

[0056] Referring to Figure 1 In an embodiment, the energy-saving control circuit comprises:

[0057] The key interface circuit 10 is used for connecting a power supply, and is used for outputting a key trigger signal when being pressed by a user;

[0058] The first timer 30;

[0059] The main control circuit 20, an input end of the main control circuit 20 is connected with the key interface circuit 10, an output end of the main control circuit 20 is connected with the motor, the main control circuit 20 is electrically connected with the first timer 30, and the main control circuit 20 is used for controlling the motor to work and controlling the first timer 30 to start timing when receiving the key trigger signal;

[0060] The first timer 30 is used for outputting a first timing trigger signal to the main control circuit 20 when the timing time reaches a first preset time;

[0061] The main control circuit 20 is configured to control the key interface circuit 10 to disconnect the power supply from the motor when the first timing trigger signal is received.

[0062] In the embodiment, the key interface circuit 10 can be composed of keys, connection ports and resistors, etc. The keys can output a key trigger signal to the main control circuit 20 when pressed by a user, and no key trigger signal will be output when the user releases the keys. The connection ports can be used to connect the power supply to provide working voltage for the main control circuit 20 and the motor. The first timer 30 can be an electronic timer, which can be a quartz crystal oscillator. The quartz crystal will vibrate stably under the action of an electric field to generate an accurate electric signal, which is converted into time after circuit processing. The main control circuit 20 can be composed of a main control chip and resistors, capacitors, etc. The main control chip can control the motor to start working and the first timer 30 to start timing when receiving the key trigger signal output by the key interface circuit 10. The first timer 30 is configured to output a first timing trigger signal to the main control circuit 20 when the timing time reaches the first preset time. The main control circuit 20 is configured to control the key interface circuit 10 to disconnect the power supply from the motor when receiving the first timing trigger signal. In the embodiment, if the time the user presses the key exceeds the first preset time of the first timer 30, it can be defined as long pressing, otherwise it is short pressing. The first preset time can be set according to actual conditions and user needs. In addition, in the embodiment, short pressing the key can make the main control chip adjust the working mode of the handheld fan. Taking a handheld fan with three wind speed gears as an example, the three wind speed gears are divided into 1 gear, 2 gear and 3 gear. In the off state of the handheld fan, short pressing controls the power on and the motor runs at 1 gear, short pressing again controls the power on at 2 gear, short pressing again controls the power on at 3 gear, and short pressing again controls the power off. Long pressing the motor at 1 gear, 2 gear and 3 gear can also directly turn off the power. In this way, the combination of a key and the first timer 30 can realize the wind speed control and on-off control of the handheld fan, and can avoid the power consumption caused by the sleep of the handheld fan.

[0063] This utility model's technical solution comprises an energy-saving control circuit using a button interface circuit 10, a first timer 30, and a main control circuit 20. The button interface circuit 10 connects to the power supply. When pressed by the user, it outputs a button trigger signal to the main control circuit 20. The input terminal of the main control circuit 20 is connected to the button interface circuit 10, and its output terminal is connected to the motor. The main control circuit 20 is electrically connected to the first timer 30. Upon receiving the button trigger signal, the main control circuit 20 controls the motor to operate and starts the first timer 30. The first timer 30 outputs a first timing trigger signal to the main control circuit 20 when the timing reaches a first preset time. Upon receiving the first timing trigger signal, the main control circuit 20 controls the button interface circuit 10 to disconnect the power supply from the motor. Thus, this solution allows control of the motor in the handheld fan using only one button in the button interface circuit 10, thereby controlling the fan speed. It can also be combined with the first timer 30 to control the handheld fan's on / off operation. A single button simplifies the layout of the handheld fan, and turning it off with a single button also avoids the power consumption generated by the handheld fan going into sleep mode.

[0064] Reference Figure 2 In one embodiment, the button interface circuit 10 includes:

[0065] Composite button SW1;

[0066] The power input terminal JP5 is used to connect to the power supply.

[0067] The first switch Q1 is connected to the composite button SW1, the input terminal of the first switch Q1 is connected to the power input terminal JP5, and the output terminal of the first switch Q1 is connected to the main control circuit 20.

[0068] The composite button SW1 is used to control the first switch Q1 to conduct the electrical connection between the power input terminal JP5 and the main control circuit 20 when it is triggered, and output a button trigger signal to the main control circuit 20.

[0069] In this embodiment, the button interface circuit 10 consists of a composite button SW1, a power input terminal JP5, and a first switching transistor Q1. The power input terminal JP5 can be connected to a power source, such as a lithium battery pack. The first switching transistor Q1 can be a field-effect transistor, with its gate connected to ON / OFF1. When ON / OFF1 is low, 3V is active; otherwise, 3V is zero. The composite button SW1 serves as both a power switch and a fan speed control button. A short press turns the handheld fan on and sets the motor to speed 1; another short press sets it to speed 2; another short press sets it to speed 3; and another short press turns it off. A long press while the fan is at speeds 1, 2, or 3 also turns it off. Figure 2KEY MODE in the key interface circuit 10 is the connection port of the control chip in the main control circuit 20, configured as an upper pull input, and a low level is detected as a key being pressed. ON / OFF is the output port of the control chip in the main control circuit 20, and when the ON / OFF output is high, ON / OFF1 is low, and when the ON / OFF output is low, ON / OFF1 is high; ON / OFF1 is also low when the composite key SW1 is pressed, and is high by default. When the composite key SW1 is pressed, ON / OFF1 is pulled low, and the first switch tube Q1 can conduct a voltage of 3V, the control chip in the main control circuit 20 is powered on and detects whether a key is pressed, and outputs high when a key is pressed. When the key is released, ON / OFF1 is also pulled low, and the first switch tube Q1 is also conducted. In this way, the power supply and the control chip can be controlled by pressing the composite key SW1, thereby controlling the on-off state of the handheld fan and the wind speed of the handheld fan.

[0070] Further, with reference to Figure 2 In an embodiment, the key interface circuit 10 further comprises a first resistor R1, a second resistor R2, a first diode D1, a second diode D2 and a first triode Q4, the first end of the first resistor R1 is connected with the main control circuit 20, the second end of the first resistor R1 and the first end of the second resistor R2 are connected with the base of the first triode Q4, the second end of the second resistor R2 and the emitter of the first triode Q4 are grounded, the collector of the first triode Q4 and the anode of the second diode D2 are connected with the controlled end of the first switch tube Q1, the cathode of the first diode D1 is connected with the cathode of the second diode D2, and the anode of the first diode D1 is connected with the main control circuit 20.

[0071] In the embodiment, the first resistor R1 and the second resistor R2 can function as current limiting resistors and pull-down resistors, ensuring the normal operation of the triode. With reference to the above embodiment, the second diode D2 can prevent ON / OFF1 from being pulled low, causing the composite key SW1 to be always low, and the upper pull of KEY MODE can make the composite key SW1 high through the first diode D1, and the composite key SW1 outputs low only when it is pressed.

[0072] With reference to Figure 3 In an embodiment, the energy-saving control circuit further comprises:

[0073] The timing key 40 is used to output a timing trigger signal when pressed by a user;

[0074] The second timer 50 is electrically connected with the main control circuit 20.

[0075] The input end of the main control circuit 20 is connected with the timing button 40, and the main control circuit 20 is used for adjusting the automatic reload value of the second timer 50 and controlling the second timer 50 to start timing when the timing trigger signal is received.

[0076] The second timer 50 is used for outputting a second timing trigger signal to the main control circuit 20 when the timing time reaches the second preset time.

[0077] The main control circuit 20 is also used for disconnecting the electrical connection between the power supply and the motor when the second timing trigger signal is received.

[0078] In the embodiment, by setting the timing button 40 and the second timer 50, the problem that the handheld fan does not have the function of timing shutdown or the timing function is single can be solved. Specifically, the timing button 40 outputs a timing trigger signal to the main control circuit 20 when being pressed by the user; the main control circuit 20 adjusts the automatic reload value of the second timer 50 and controls the second timer 50 to start timing when the timing trigger signal is received; the second timer 50 outputs a second timing trigger signal to the main control circuit 20 when the timing time reaches the second preset time; and the main control circuit 20 can disconnect the electrical connection between the power supply and the motor when the second timing trigger signal is received. That is, the timing time of the timer can be adjusted through the timing button 40, so that the working time of the handheld fan is adjusted. Referring to the short press and the long press in the above embodiment, the user can determine the timing time of the second timer 50 through the short press to add one minute and the long press to quickly increase. The longest time can be 720 minutes, the shortest time can be 1 minute, and the timing time of zero means no timing. The timing button 40 can also be set to be quickly pressed multiple times to clear the timing time, and the specific number of times can be set according to the actual situation and user demand.

[0079] Referring to Figure 4 In an embodiment, the energy-saving control circuit further includes:

[0080] The input end of the digital display circuit is connected with the output end of the main control circuit 20, and the main control circuit 20 is used for controlling the digital display circuit to work when the second timing trigger signal is received.

[0081] In the embodiment, the digital display circuit can be composed of multiple nixie tubes. Referring to the content of the above embodiment, after the timing time of the timer is adjusted through the timing button 40, the main control circuit 20 can also control the nixie tubes to display the timing time or the remaining timing time. In this way, the user can easily know the remaining working time of the handheld fan. In addition, the nixie tubes can be set to be turned off after 5 seconds of countdown without being turned on and turned on by short pressing the timing button 40. The specific circuit structure of the digital display circuit can be set with reference to Figure 4 .

[0082] In an embodiment, the master control circuit 20 comprises:

[0083] a control chip, an input end of the control chip being connected with the key interface circuit 10, the control chip being electrically connected with the first timer 30, the control chip being configured to output a motor control signal when receiving the key trigger signal, and control the first timer 30 to start timing, and control the key interface circuit 10 to disconnect the electrical connection between the power supply and the motor when receiving the first timing trigger signal;

[0084] a motor driving circuit, an input end of the motor driving circuit being connected with an output end of the control chip, a driving end of the motor driving circuit being connected with the motor, the motor driving circuit being configured to drive the motor to work when receiving the motor control signal.

[0085] In the embodiment, the master control circuit 20 can be composed of a control chip and a motor driving circuit. The control chip can be a digital signal processor (Digital Signal Processor, DSP for short), a programmable logic device (Programmable Logic Device, PLD for short), a field programmable gate array (Field Programmable Gate Array, FPGA for short), a microprocessor, an MCU single-chip microcomputer or other electronic components; the motor driving circuit can be composed of a microcontroller and a driver, and the specific circuit structure can refer to Figure 5 be set. The control chip can output a motor control signal to the motor driving circuit when receiving the key trigger signal, and control the first timer 30 to start timing, and control the key interface circuit 10 to disconnect the electrical connection between the power supply and the motor when receiving the first timing trigger signal. The motor driving circuit can drive the motor to work when receiving the motor control signal.

[0086] Referring to Figure 6 In an embodiment, the energy-saving control circuit further comprises:

[0087] a motor current detection circuit, a detection end of the motor current detection circuit being connected with the motor, an output end of the motor current detection circuit being connected with the master control circuit 20, the motor current detection circuit being configured to detect the working current of the motor, and output a motor current detection signal to the master control circuit 20.

[0088] In this embodiment, the motor can adopt a direct current brushless motor, the motor current detection circuit detects the motor current through a differential signal, and the main control circuit 20 can accurately detect the running state of the current motor through the motor current detection signal, so as to prevent the motor from overcurrent or unstable state and the like. The specific circuit structure of the motor current detection circuit can refer to Figure 6 be set.

[0089] Referring to Figure 7 In an embodiment, the energy-saving control circuit further comprises:

[0090] A power supply voltage detection circuit, a detection end of the power supply voltage detection circuit is connected with the motor, an output end of the power supply voltage detection circuit is connected with the main control circuit 20, and the power supply voltage detection circuit is used for detecting the power supply voltage of the motor and outputting a power supply voltage detection signal to the main control circuit 20.

[0091] In this embodiment, the power supply voltage of the motor is detected through the power supply voltage detection circuit, and the main control circuit 20 can adjust the motor speed according to the power supply voltage, so that the motor runs more durably. The specific circuit structure of the power supply voltage detection circuit can refer to Figure 7 be set.

[0092] Referring to Figure 8 In an embodiment, the energy-saving control circuit further comprises:

[0093] A battery pack BAT connected with the main control circuit 20;

[0094] A battery voltage detection circuit, a detection end of the battery voltage detection circuit is connected with the battery pack BAT, and an output end of the battery voltage detection circuit is connected with the main control circuit 20, and the battery voltage detection circuit is used for detecting the output voltage of the battery pack BAT and outputting a battery voltage detection signal to the main control circuit 20.

[0095] In this embodiment, the battery pack BAT can be composed of a plurality of lithium batteries, or can be other types of batteries. The battery voltage of the battery pack BAT is detected through the battery voltage detection circuit, and the main control circuit 20 can control the motor speed to be increased or decreased according to the battery voltage, so as to increase the stability of the motor. The specific circuit structure of the battery voltage detection circuit can refer to Figure 8 be set. The resistance can play a voltage dividing role, and the battery pack BAT can be powered to be more energy-saving.

[0096] The utility model further provides a handheld fan.

[0097] In an embodiment, the handheld fan comprises a motor and the energy-saving control circuit as described above, and the motor is connected with the master control circuit 20 in the energy-saving control circuit. It can be understood that, since the energy-saving control circuit is used in the handheld fan of the present application, the embodiments of the handheld fan of the present application include all the technical solutions of all the embodiments of the energy-saving control circuit, and the technical effects achieved are also completely the same, which will not be described here.

[0098] It should be understood that the application of the present application is not limited to the above examples, and those skilled in the art can make improvements or changes according to the above description, and all these improvements and changes shall belong to the protection scope of the appended claims of the present application.

Claims

1. An energy-saving control circuit applied to a handheld fan, the handheld fan including a motor, characterized in that, The energy-saving control circuit includes: A button interface circuit is used to connect to a power supply. The button interface circuit is used to output a button trigger signal when pressed by a user. First timer; The main control circuit has its input terminal connected to the button interface circuit, its output terminal connected to the motor, and its electrical connection to the first timer. The main control circuit is used to control the motor to work and control the first timer to start timing when it receives the button trigger signal. The first timer is used to output a first timing trigger signal to the main control circuit when the timing time reaches a first preset time; The main control circuit is used to control the button interface circuit to disconnect the electrical connection between the power supply and the motor when it receives the first timing trigger signal.

2. The energy-saving control circuit as described in claim 1, characterized in that, The button interface circuit includes: Composite buttons; Power input terminal, used to connect to the power supply; The first switching transistor has its controlled terminal connected to the composite button, its input terminal connected to the power input terminal, and its output terminal connected to the main control circuit. The composite button is used to control the first switch to conduct the electrical connection between the power input terminal and the main control circuit when it is triggered, and to output a button trigger signal to the main control circuit.

3. The energy-saving control circuit as described in claim 2, characterized in that, The button interface circuit further includes a first resistor, a second resistor, a first diode, a second diode, and a first transistor. The first end of the first resistor is connected to the main control circuit. The second end of the first resistor is connected to the first end of the second resistor and the base of the first transistor. The second end of the second resistor and the emitter of the first transistor are grounded. The collector of the first transistor and the anode of the second diode are connected to the controlled terminal of the first switching transistor. The cathode of the first diode is connected to the cathode of the second diode. The anode of the first diode is connected to the main control circuit.

4. The energy-saving control circuit as described in claim 1, characterized in that, The energy-saving control circuit also includes: A timer button, which is used to output a timed trigger signal when pressed by a user; The second timer is electrically connected to the main control circuit. The input terminal of the main control circuit is connected to the timing button. The main control circuit is used to adjust the automatic reload value of the second timer and control the second timer to start timing when it receives the timing trigger signal. The second timer is used to output a second timing trigger signal to the main control circuit when the timing time reaches a second preset time; The main control circuit is also used to disconnect the electrical connection between the power supply and the motor when the second timing trigger signal is received.

5. The energy-saving control circuit as described in claim 4, characterized in that, The energy-saving control circuit also includes: A digital display circuit, wherein the input terminal of the digital display circuit is connected to the output terminal of the main control circuit, and the main control circuit is used to control the digital display circuit to work when it receives the second timing trigger signal.

6. The energy-saving control circuit as described in claim 1, characterized in that, The main control circuit includes: The control chip has its input terminal connected to the button interface circuit and is electrically connected to the first timer. When the control chip receives the button trigger signal, it outputs a motor control signal and controls the first timer to start timing. When the control chip receives the first timing trigger signal, it controls the button interface circuit to disconnect the electrical connection between the power supply and the motor. A motor drive circuit is provided, wherein the input terminal of the motor drive circuit is connected to the output terminal of the control chip, and the drive terminal of the motor drive is connected to the motor. The motor drive circuit is used to drive the motor to work when it receives the motor control signal.

7. The energy-saving control circuit as described in claim 1, characterized in that, The energy-saving control circuit also includes: A motor current detection circuit is provided, wherein the detection terminal of the motor current detection circuit is connected to the motor, and the output terminal of the motor current detection circuit is connected to the main control circuit. The motor current detection circuit is used to detect the operating current of the motor and output a motor current detection signal to the main control circuit.

8. The energy-saving control circuit as described in claim 1, characterized in that, The energy-saving control circuit also includes: A power supply voltage detection circuit is provided, wherein the detection terminal of the power supply voltage detection circuit is connected to the motor, and the output terminal of the power supply voltage detection circuit is connected to the main control circuit. The power supply voltage detection circuit is used to detect the power supply voltage of the motor and output a power supply voltage detection signal to the main control circuit.

9. The energy-saving control circuit as described in claim 1, characterized in that, The energy-saving control circuit also includes: The battery pack is connected to the main control circuit; A battery voltage detection circuit is provided, wherein the detection terminal of the battery voltage detection circuit is connected to the battery pack, and the output terminal of the battery voltage detection circuit is connected to the main control circuit. The battery voltage detection circuit is used to detect the output voltage of the battery pack and output a battery voltage detection signal to the main control circuit.

10. A handheld fan, characterized in that, It includes a motor and an energy-saving control circuit as described in any one of claims 1-9, wherein the motor is connected to the main control circuit in the energy-saving control circuit.

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