Fan power supply circuit and fan

Abstract

The utility model discloses a fan power supply circuit and a fan, and relates to the technical field of power supply control. The fan comprises a motor used for driving fan blades to rotate. The power supply circuit comprises a main control circuit; the input end of the voltage conversion circuit is electrically connected with the power input end, the output end of the voltage conversion circuit is electrically connected with the power end of the motor, and the voltage conversion circuit is provided with a voltage setting pin; the controlled end of the resistance setting circuit is electrically connected with the main control circuit, and the resistance setting circuit is electrically connected with a voltage setting pin of the voltage conversion circuit; the resistance setting circuit is used for adjusting the resistance value of a voltage setting pin of the voltage conversion circuit according to the setting signal output by the main control circuit; wherein the voltage conversion circuit is used for converting a first voltage received by the input end of the voltage conversion circuit into a second voltage of a corresponding voltage value according to the resistance value of the voltage setting pin and outputting the second voltage. The utility model aims to improve the control precision of fan gear switching.

Description

TECHNICAL FIELD

[0001] The utility model relates to power supply control technical field, especially a fan power circuit and fan. BACKGROUND

[0002] In the prior art, the fan with different intensity gears usually realizes the switching of intensity gears by adjusting PWM signals. It can be understood that PWM is a technology for adjusting output power by changing the duty cycle (i.e. the ratio of high level time to period) of the signal. For the fan, this means that the average voltage received by the fan motor can be adjusted by changing the duty cycle of the PWM signal, thereby changing the fan speed. Among them, different frequencies of PWM signals have different responses to the motor, and too low or too high frequencies can cause the motor efficiency to decrease or the noise to increase. In addition, the components in the actual circuit, such as transistors and diodes, will have certain conduction voltage drop and switching loss, which will affect the voltage accuracy finally applied to the fan. Therefore, the fan has the problem of low control accuracy when using PWM signals to realize the switching of intensity gears. SUMMARY

[0003] The main purpose of the utility model is to provide a fan power circuit and fan, which aims to improve the control accuracy of fan gear switching.

[0004] To achieve the above purpose, the fan power circuit provided by the utility model, the fan includes a motor for driving the rotation of the fan blade, and the power circuit includes:

[0005] A main control circuit;

[0006] A voltage conversion circuit, the input end of the voltage conversion circuit is electrically connected with the power input end, the output end of the voltage conversion circuit is electrically connected with the power end of the motor, and the voltage conversion circuit has a voltage setting pin;

[0007] A resistance setting circuit, the controlled end of the resistance setting circuit is electrically connected with the main control circuit, and the resistance setting circuit is electrically connected with the voltage setting pin of the voltage conversion circuit; the resistance setting circuit is used for adjusting the resistance value of the voltage setting pin of the voltage conversion circuit according to the setting signal output by the main control circuit;

[0008] The voltage conversion circuit is used for converting the first voltage received by the input end into a second voltage with a corresponding voltage value according to the resistance value of the voltage setting pin.

[0009] In an embodiment, the voltage conversion circuit includes a voltage conversion chip, a first resistor, a first capacitor, a first diode and an inductor.

[0010] The voltage conversion chip has a voltage setting pin, the voltage setting pin of the voltage conversion chip is electrically connected with the resistance setting circuit, the enable pin of the voltage conversion chip is electrically connected with the master control circuit, the voltage input pin of the voltage conversion chip is electrically connected with the power input end, the first end of the first capacitor and the second end of the inductor, the grounding pin of the voltage conversion chip is grounded, the current limiting pin of the voltage conversion chip is electrically connected with the first end of the first resistor, and the inductor control pin of the voltage conversion chip is electrically connected with the first end of the inductor and the anode of the first diode; the second end of the first resistor is grounded; the second end of the first capacitor is grounded; and the cathode of the first diode is electrically connected with the motor and the resistance setting circuit.

[0011] In an embodiment, the resistance setting circuit comprises a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor; the controlled end of the resistance setting circuit comprises a second end of the second resistor, a second end of the third resistor and a second end of the fourth resistor;

[0012] The second end of the second resistor, the second end of the third resistor and the second end of the fourth resistor are respectively electrically connected with the master control circuit, the first end of the second resistor, the first end of the third resistor and the first end of the fourth resistor are all electrically connected with the second end of the fifth resistor; the first end of the fifth resistor is electrically connected with the second end of the sixth resistor and the voltage setting pin; and the first end of the sixth resistor is electrically connected with the cathode of the first diode and the motor.

[0013] In an embodiment, the fan comprises a battery; the power supply circuit further comprises a power supply switching circuit, a first input end of the power supply switching circuit is electrically connected with a charging access end, a second input end of the power supply switching circuit is electrically connected with the battery, and an output end of the power supply switching circuit is electrically connected with an input end of the voltage conversion circuit;

[0014] The power supply switching circuit is used for, when the charging access end is accessed, disconnecting the path between the battery and the voltage conversion circuit and turning on the path between the charging access end and the input end of the voltage conversion circuit.

[0015] In an embodiment, the power supply switching circuit comprises a seventh resistor, an eighth resistor, a second diode and a first switch tube;

[0016] The anode of the second diode is electrically connected with the charging access end, and the cathode of the second diode is electrically connected with the second end of the first switch tube and the voltage conversion circuit; the first end of the first switch tube is electrically connected with the battery, and the controlled end of the first switch tube is electrically connected with the first end of the seventh resistor and the first end of the eighth resistor; the second end of the seventh resistor is electrically connected with the charging access end; and the second end of the eighth resistor is grounded.

[0017] In an embodiment, the power supply circuit further comprises a trigger circuit, which is electrically connected with the main control circuit; the trigger circuit is used for outputting a corresponding trigger signal when triggered.

[0018] The main control circuit is used for receiving the trigger signal and outputting a corresponding setting signal.

[0019] In an embodiment, the power supply circuit further comprises a switch circuit, which is connected in series in an electrical loop between the power supply end of the motor and the output end of the voltage conversion circuit, and the controlled end of the switch circuit is electrically connected with the main control circuit.

[0020] The main control circuit is used for controlling the switch circuit to be in a closed or open state.

[0021] In an embodiment, the power supply circuit further comprises a current detection circuit, which is electrically connected with the main control circuit; the current detection circuit is used for detecting the working current of the motor and outputting a corresponding current detection signal.

[0022] In an embodiment, the power supply circuit further comprises a switch circuit, which is connected in series in an electrical loop between the power supply end of the motor and the output end of the voltage conversion circuit, and the controlled end of the switch circuit is electrically connected with the main control circuit; the switch circuit comprises a second switch tube and a ninth resistor; and the current detection circuit comprises a tenth resistor and a second capacitor.

[0023] The first end of the second switch tube is electrically connected with the motor, the second end of the switch tube is electrically connected with the first end of the tenth resistor, the first end of the second capacitor and the main control circuit, the controlled end of the second switch tube is electrically connected with the main control circuit and the first end of the ninth resistor; and the second end of the ninth resistor is connected with the second end of the tenth resistor and the second end of the first capacitor and grounded.

[0024] The utility model further provides a fan, the fan includes the fan power supply circuit and battery, charging access end, motor of any above.

[0025] The utility model discloses a fan power supply circuit, fan power supply circuit includes main control circuit, voltage conversion circuit and resistance setting circuit. Among them, the input end of voltage conversion circuit is connected with power input, and the output end of voltage conversion circuit is connected with the power end of motor, and voltage conversion circuit has voltage setting foot;The controlled end of resistance setting circuit is connected with main control circuit, and resistance setting circuit is connected with the voltage setting foot of voltage conversion circuit;Resistance setting circuit is used for adjusting the resistance value of voltage setting foot of voltage conversion circuit according to the setting signal output by main control circuit. The corresponding setting signal of main control circuit is exported to resistance setting circuit to make resistance setting circuit adjust the resistance value of voltage setting foot. Voltage conversion circuit converts the first voltage received by its input end into the second voltage of corresponding voltage value by confirming the voltage of voltage setting foot. It can be understood that the resistance value of voltage setting foot corresponds to the second voltage of voltage conversion circuit conversion output, thereby improving the control precision of fan gear switching. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to the structure shown in these drawings without creative labor.

[0027] Figure 1 It is the module schematic diagram of the utility model fan power supply circuit;

[0028] Figure 2 It is the module schematic diagram of the utility model fan power supply circuit one embodiment;

[0029] Figure 3 It is the circuit schematic diagram of the utility model fan power supply circuit.

[0030] EXPLANATION OF DRAWINGS:

[0031] 10, main control circuit;20, voltage conversion circuit;30, resistance setting circuit;40, power switching circuit;50, trigger circuit;60, switching circuit;70, current detection circuit;R1-R10, first resistance-tenth resistance;D1-D2, first diode-second diode;Q1-Q2, first switch tube-second switch tube;C1-C3, first capacitor-third capacitor;L, inductance;

[0032] The realization, functional characteristics and advantages of the utility model will be further explained with reference to the drawings. DETAILED DESCRIPTION

[0033] With reference to the drawings and embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0034] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0035] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance 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. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of those skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0036] In the prior art, the fan with different intensity gears is usually switched by adjusting the PWM signal to realize the intensity gear switching. It can be understood that PWM is a technology for adjusting the output power by changing the duty cycle (i.e. the ratio of high level time to period) of the signal. For the fan, this means that the average voltage received by the fan motor can be adjusted by changing the duty cycle of the PWM signal, so as to change the fan speed. Among them, different frequencies of PWM signals have different responses to the motor, and too low or too high frequency may cause the motor efficiency to decrease or the noise to increase. In addition, the components in the actual circuit, such as transistors, diodes, etc., will have certain conduction voltage drop and switching loss, which will affect the voltage accuracy finally applied to the fan. Therefore, the fan has the problem of low control accuracy when using the PWM signal to realize the intensity gear switching.

[0037] To solve the above problems, with reference to Figure 1 and Figure 3 The present application provides a fan power supply circuit, the fan includes a motor for driving the rotation of the fan blade, and the power supply circuit includes:

[0038] a main control circuit 10;

[0039] A voltage conversion circuit 20, an input end of the voltage conversion circuit 20 is electrically connected with the power input end, an output end of the voltage conversion circuit 20 is electrically connected with the power end of the motor, the voltage conversion circuit 20 has a voltage setting pin;

[0040] A resistance setting circuit 30, a controlled end of the resistance setting circuit 30 is electrically connected with the main control circuit 10, the resistance setting circuit 30 is electrically connected with the voltage setting pin of the voltage conversion circuit 20; the resistance setting circuit 30 is used for adjusting the resistance value of the voltage setting pin of the voltage conversion circuit 20 according to the setting signal output by the main control circuit 10.

[0041] The voltage conversion circuit 20 is used for converting the first voltage received by the input end into the second voltage with the corresponding voltage value according to the resistance value of the voltage setting pin.

[0042] It can be understood that the wind force gear adjustment of the fan is usually realized by changing the rotating speed of the motor. The rotating speed of the motor can be adjusted by changing the voltage input to the motor. Therefore, the control precision of the fan switching between different gears can be improved by accurately adjusting the voltage output to the motor.

[0043] In the embodiment, the main control circuit 10 can be realized by a main controller, for example, a SOC (System On Chip), a MCU (Microcontroller Unit), a DSP (Digital Signal Process), a FPGA (Field Programmable Gate Array) and the like. The main control circuit 10 is used for receiving corresponding signals and outputting corresponding control signals in the fan power circuit, so that the corresponding circuit performs corresponding actions.

[0044] In the embodiment, the voltage conversion circuit 20 can be implemented by a buck circuit (the average output voltage is always lower than the average input voltage), a buck-boost circuit (the average output voltage can be lower or higher than the average input voltage), a boost circuit (the average output voltage is always higher than the average input voltage), a Chock circuit (a buck-boost circuit with continuous input and output current and small harmonic components), etc. The input terminal of the voltage conversion circuit 20 is electrically connected to the power input terminal, which can be the output terminal of a battery or the access terminal of a household power supply. Further, the voltage conversion circuit 20 needs to be selected according to the type of the first voltage and the type of the second voltage. The first voltage includes direct current, alternating current, and a voltage higher than the maximum voltage required by the motor or lower than the minimum voltage required by the motor. The second voltage is selected according to the type of the motor, such as a direct current brushless motor or an alternating current induction motor. Therefore, the voltage conversion circuit 20 needs to be selected according to the actual requirements to enable the motor in the fan to work stably.

[0045] Optionally, the voltage conversion circuit 20 includes a voltage conversion chip, a first resistor R1, a first capacitor C1, a first diode D1, and an inductor L.

[0046] The voltage setting pin of the voltage conversion chip is electrically connected to the resistance setting circuit 30, the enable pin of the voltage conversion chip is electrically connected to the master control circuit 10, the voltage input pin of the voltage conversion chip is electrically connected to the power input terminal, the first terminal of the first capacitor C1, and the second terminal of the inductor L, the grounding pin of the voltage conversion chip is grounded, the current limiting pin of the voltage conversion chip is electrically connected to the first terminal of the first resistor R1, the inductor L control pin of the voltage conversion chip is electrically connected to the first terminal of the inductor L and the anode of the first diode D1, the second terminal of the first resistor R1 is grounded, the second terminal of the first capacitor C1 is grounded, and the cathode of the first diode D1 is electrically connected to the motor and the resistance setting circuit 30.

[0047] In the embodiment, the voltage conversion chip is a boost type DC-DC conversion chip, which can be implemented by an LN2292 chip. When the LN2292 chip starts to work, the inductor L starts to store energy. When the current of the inductor L reaches a certain value, the switch is closed, the inductor L releases energy, and the energy is transmitted to the output through the first diode D1, thereby increasing the output voltage. The LN2292 chip converts the input first voltage into the second voltage and outputs the second voltage in this way. The second voltage is adjusted according to the resistance value of the voltage setting pin. In other words, the second voltage output by the voltage conversion circuit 20 can be adjusted by adjusting the resistance value of the voltage setting pin.

[0048] In the embodiment, the resistance setting circuit 30 can be implemented by a series-parallel resistance circuit, or by a switch circuit 60 and a plurality of resistance circuits. The controlled end of the resistance setting circuit 30 is electrically connected to the master control circuit 10, and the resistance setting circuit 30 is electrically connected to the voltage setting pin of the voltage conversion circuit 20. By receiving the setting signal output by the master control circuit 10, the resistance value of the voltage setting pin of the voltage conversion circuit 20 is adjusted.

[0049] Optionally, the resistance setting circuit 30 comprises a second resistance R2, a third resistance R3, a fourth resistance R4, a fifth resistance R5, and a sixth resistance R6. The controlled end of the resistance setting circuit 30 comprises a second end of the second resistance R2, a second end of the third resistance R3, and a second end of the fourth resistance R4.

[0050] The second end of the second resistance R2, the second end of the third resistance R3, and the second end of the fourth resistance R4 are electrically connected to the master control circuit 10, respectively. The first end of the second resistance R2, the first end of the third resistance R3, and the first end of the fourth resistance R4 are electrically connected to the second end of the fifth resistance R5. The first end of the fifth resistance R5 is electrically connected to the second end of the sixth resistance R6 and the voltage setting pin. The first end of the sixth resistance R6 is electrically connected to the cathode of the first diode D1 and the motor.

[0051] In the embodiment, the fan is provided with three gears, which correspond to different rotating speeds of the motor, that is, the second voltage output by the voltage conversion circuit 20 has three values. The second resistor R2, the third resistor R3 and the fourth resistor R4 have different resistance values, so that they represent three different resistance values after being connected in series with other resistors. Further, the second resistor R2, the third resistor R3 and the fourth resistor R4 are connected in parallel with each other and are electrically connected to the main control circuit 10 respectively to receive the setting signal output by the main control circuit 10. It can be understood that the setting signal is a low-level signal. The main control circuit 10 outputs the low-level signal to the corresponding resistor through different IO ports, so that the resistance value of the voltage setting pin is adjusted, and then the voltage conversion circuit 20 converts the first voltage received at the input end into a second voltage with a corresponding voltage value according to the resistance value of the voltage setting pin. For example, the second resistor R2 represents a second voltage of 7V, the third resistor R3 represents a second voltage of 9V, and the second resistor R2 represents a second voltage of 12V. When the main control circuit 10 needs to control the second voltage output by the voltage conversion circuit 20 to be 7V, the corresponding low-level signal is output to the second resistor R2, and the third resistor R3 and the fourth resistor R4 are left floating at the end electrically connected to the main control circuit 10, so that the voltage conversion circuit 20 adjusts the second voltage output according to the resistance values of the first resistor R1, the fifth resistor R5 and the sixth resistor R6 to be 7V. In addition, a filter circuit can be arranged at the output end of the voltage conversion circuit 20, so that the second voltage is input to the motor after being filtered. The filter circuit can be implemented by the third capacitor C3.

[0052] In the embodiment, the main control circuit 10 outputs the corresponding setting signal to the resistor setting circuit 30, so that the resistor setting circuit 30 adjusts the resistance value of the voltage setting pin. The voltage conversion circuit 20 converts the first voltage received at the input end into a second voltage with a corresponding voltage value by confirming the different voltages of the voltage setting pin. It can be understood that the resistance value of the voltage setting pin corresponds to the second voltage converted and output by the voltage conversion circuit 20, so that the control accuracy of the fan gear switching is improved.

[0053] Reference Figure 2 and Figure 3 In an embodiment of the utility model, the fan includes a battery; the power supply circuit further includes a power supply switching circuit 40, the first input end of the power supply switching circuit 40 is electrically connected with the charging access end, the second input end of the power supply switching circuit 40 is electrically connected with the battery, and the output end of the power supply switching circuit 40 is electrically connected with the input end of the voltage conversion circuit 20;

[0054] The power supply switching circuit 40 is used to disconnect the path between the battery and the voltage conversion circuit 20 and turn on the path between the charging access end and the input end of the voltage conversion circuit 20 when the charging access end is accessed.

[0055] In the embodiment, the power input end electrically connected with the input end of the voltage conversion circuit 20 can be a battery or a battery access end. It can be understood that, in order to avoid the loss of the battery power and ensure the service life of the battery, when the power is accessed through the charging access end, the power accessed through the charging access end should be preferentially selected to provide the first voltage. The power switching circuit 40 can be implemented by using a single-pole double-throw switch circuit, a detection induction switch circuit or a switch array circuit.

[0056] Optionally, the power switching circuit 40 comprises a seventh resistor R7, an eighth resistor R8, a second diode D2 and a first switch tube Q1.

[0057] The anode of the second diode D2 is electrically connected with the charging access end, the cathode of the second diode D2 is electrically connected with the second end of the first switch tube Q1 and the voltage conversion circuit 20; the first end of the first switch tube Q1 is electrically connected with the battery, the controlled end of the first switch tube Q1 is electrically connected with the first end of the seventh resistor R7 and the first end of the eighth resistor R8; the second end of the seventh resistor R7 is electrically connected with the charging access end; and the second end of the eighth resistor R8 is grounded.

[0058] In the embodiment, the voltage input through the charger access end is 5V, and the first switch tube Q1 is taken as a PMOS tube. When the charger access end is accessed, the 5V voltage is reduced by 0.3V through the second diode D2, and the voltage is 4.7V, that is, the source voltage of the PMOS tube is 4.7V. The gate voltage of the PMOS tube is also included in the 5V voltage input through the charger access end. At this time, the source voltage of the PMOS tube is 4.7V, and the gate voltage of the PMOS tube is 5V, that is, VGS is 0.3V, and the PMOS tube will be disconnected. Therefore, the battery electrically connected with the drain of the PMOS tube will stop supplying power to the motor due to the disconnection of the PMOS tube, and the power supply of the motor will be supplied by the voltage accessed through the charger access end. The second diode D2 is used for unidirectional conduction, so as to avoid the current output to the charging access end when the battery supplies power. Through the automatic switching power supply mode of the circuit, the endurance time of the battery is effectively prolonged, and the controlled demand of the main control circuit 10 is avoided.

[0059] Reference Figure 2 And Figure 3 In an embodiment of the utility model, the power circuit further comprises a trigger circuit 50, the trigger circuit 50 is electrically connected with the main control circuit 10;The trigger circuit 50 is used to output corresponding trigger signal when being triggered.

[0060] The main control circuit 10 is used to receive the trigger signal and output corresponding setting signal.

[0061] In the embodiment, the trigger circuit 50 can be realized by setting corresponding trigger buttons, touch screens and the like on the surface of the fan, and outputs corresponding trigger signals to the main control circuit 10 when being touched by a person, so that the main control circuit 10 outputs corresponding setting signals. The trigger circuit 50 can be multiple groups or only one group. Taking the trigger circuit 50 as one group as an example, the user can touch multiple times to make the trigger circuit 50 output multiple trigger signals to the main control circuit 10. The main control circuit 10 adjusts the setting signals output to the resistance setting circuit 30 in turn through a preset setting signal adjustment sequence. For example, when the user touches the trigger circuit 50 for the first time, the main control circuit 10 will receive the first trigger signal and output corresponding setting signals to the resistance setting circuit 30, so that the resistance value of the voltage setting pin in the resistance setting circuit 30 is adjusted to the first resistance value, and then the voltage conversion circuit 20 converts the input first voltage into a second voltage corresponding to the first resistance value; when the user touches the trigger circuit 50 for the second time, the main control circuit 10 will receive the second trigger signal and accumulate, and output corresponding setting signals to the resistance setting circuit 30, so that the resistance value of the voltage setting pin in the resistance setting circuit 30 is adjusted to the second resistance value, and then the voltage conversion circuit 20 converts the input first voltage into a second voltage corresponding to the second resistance value. Further, when the trigger signals received by the main control circuit 10 accumulate to a preset value, the accumulated number of times is cleared. By setting a single trigger circuit 50, the use of the main control circuit 10 interface can be reduced, and the overall design simplicity of the fan is improved.

[0062] Reference Figure 2 And Figure 3 In an embodiment of the utility model, the power supply circuit further includes a switch circuit 60, the switch circuit 60 is in series in the electric loop between the power supply end of the motor and the output end of the voltage conversion circuit 20, the controlled end of the switch circuit 60 is electrically connected with the main control circuit 10.

[0063] The main control circuit 10 is used for controlling the switch circuit 60 to be in the closed or open state.

[0064] In the embodiment, the switch circuit 60 can be implemented by at least one switch tube, such as MOS tube, IGBT tube, thyristor, triode, power tube, etc., and / or at least one switching device, such as contactor, circuit breaker and relay. The switch circuit 60 is connected in series in the electrical loop between the power supply end of the motor and the output end of the voltage conversion circuit 20, and the control end of the switch circuit 60 is electrically connected with the master control circuit 10, so that the switch circuit 60 can be turned on or turned off by controlling the switch control signal output by the master control circuit 10, thereby turning on or turning off the electrical loop between the power supply end of the motor and the output end of the voltage conversion circuit 20, so that the motor enters the working state or the shutdown state. Further, the switch circuit 60 can be used in combination with the trigger circuit 50. When the trigger circuit 50 is triggered, the master control circuit 10 outputs the corresponding switch control signal to the switch circuit 60 according to the trigger signal, so that the switch circuit 60 is closed, thereby turning on the electrical loop between the power supply end of the motor and the output end of the voltage conversion circuit 20; when the trigger circuit 50 is not triggered, the master control circuit 10 outputs the corresponding switch control signal to the switch circuit 60, so that the switch circuit 60 is opened, thereby turning off the electrical loop between the power supply end of the motor and the output end of the voltage conversion circuit 20.

[0065] Optionally, the power supply circuit further comprises a current detection circuit 70, which is electrically connected with the master control circuit 10; the current detection circuit 70 is used for detecting the working current of the motor and outputting the corresponding current detection signal.

[0066] In the embodiment, the current detection circuit 70 can be implemented by resistance detection circuit, Hall effect sensor, current transformer, etc. Taking the current detection circuit 70 as the resistance detection circuit as an example. A low resistance detection resistor is connected in series in the loop of the fan power supply circuit, and the current is calculated by measuring the voltage drop on the resistor. It can be understood that the voltage drop on the detection resistor is proportional to the current. The master control circuit 10 can determine whether the fan power supply circuit has overcurrent and other problems by receiving the current detection signal output by the current detection circuit 70, so as to determine whether to output the corresponding switch control signal to the switch circuit 60 to turn off the electrical loop between the power supply end of the motor and the output end of the voltage conversion circuit 20, thereby avoiding damage to the circuit and the motor.

[0067] Optionally, the power supply circuit further comprises a switch circuit 60 connected in series in an electric loop between a power supply end of the motor and an output end of the voltage conversion circuit 20, a controlled end of the switch circuit 60 being electrically connected with the master control circuit 10; the switch circuit 60 comprises a second switch tube Q2 and a ninth resistor R9; the current detection circuit 70 comprises a tenth resistor R10 and a second capacitor C2.

[0068] The first end of the second switch tube Q2 is electrically connected with the motor, the second end of the switch tube is electrically connected with the first end of the tenth resistor R10, the first end of the second capacitor C2 and the master control circuit 10, the controlled end of the second switch tube Q2 is electrically connected with the master control circuit 10 and the first end of the ninth resistor R9; the second end of the ninth resistor R9 is connected with the second end of the tenth resistor R10 and the second end of the first capacitor C1 and grounded.

[0069] In the embodiment, the switch circuit 60 is realized by the second switch tube Q2 and the ninth resistor R9. Taking the second switch tube Q2 as an NMOS tube as an example, the master control circuit 10 can output a high-level signal to the second switch tube Q2 to make the second switch tube Q2 in a closed state, and output a low-level signal to the second switch tube Q2 to make the second switch tube Q2 in an open state. At this time, the ninth resistor R9 is a pull-down circuit to ensure that the second switch tube Q2 is in an open state when no switch control signal output by the master control circuit 10 is received. The current detection circuit 70 is realized by the tenth resistor R10 and the second capacitor C2. The tenth resistor R10 is a detection resistor.

[0070] The utility model also proposes a fan, the fan includes the fan power supply circuit and battery, charging access end, motor as above any one, it is worth noting that because the utility model discloses a fan based on the above fan power supply circuit, therefore, the embodiment of the utility model discloses a fan includes all the technical schemes of all the above fan power supply circuit embodiments, and the reached technical effect is also exactly the same, and here is no more.

[0071] The above-mentioned is only the example embodiment of the utility model, and does not limit the patent range of the utility model, and the equivalent structure transformation of the utility model specification and the attached drawing contents under the technical concept of the utility model, or direct / indirect application in other related technical fields are included in the patent protection range of the utility model.

Claims

1. A fan power supply circuit, characterized by comprising: The fan comprises a motor for driving the rotation of the fan blade, and the power supply circuit comprises: a master control circuit; a voltage conversion circuit, an input end of the voltage conversion circuit being electrically connected with the power supply input end, an output end of the voltage conversion circuit being electrically connected with the power supply end of the motor, the voltage conversion circuit having a voltage setting pin; a resistance setting circuit, a controlled end of the resistance setting circuit being electrically connected with the master control circuit, the resistance setting circuit being electrically connected with the voltage setting pin of the voltage conversion circuit; the resistance setting circuit is used for adjusting the resistance value of the voltage setting pin of the voltage conversion circuit according to the setting signal output by the master control circuit; wherein the voltage conversion circuit is used for converting the first voltage received by the input end thereof into a second voltage with a corresponding voltage value according to the resistance value of the voltage setting pin.

2. The fan power supply circuit of claim 1, wherein, The voltage conversion circuit comprises a voltage conversion chip, a first resistor, a first capacitor, a first diode and an inductor; wherein the voltage conversion chip has a voltage setting pin, the voltage setting pin of the voltage conversion chip being electrically connected with the resistance setting circuit, an enable pin of the voltage conversion chip being electrically connected with the master control circuit, a voltage input pin of the voltage conversion chip being electrically connected with the power supply input end, a first end of the first capacitor and a second end of the inductor, a grounding pin of the voltage conversion chip being grounded, a current-limiting pin of the voltage conversion chip being electrically connected with a first end of the first resistor, an inductor control pin of the voltage conversion chip being electrically connected with a first end of the inductor and an anode of the first diode; a second end of the first resistor is grounded; a second end of the first capacitor is grounded; a cathode of the first diode is electrically connected with the motor and the resistance setting circuit.

3. The fan power supply circuit of claim 2, wherein, The resistance setting circuit comprises a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor; the controlled end of the resistance setting circuit comprises a second end of the second resistor, a second end of the third resistor and a second end of the fourth resistor; wherein the second end of the second resistor, the second end of the third resistor and the second end of the fourth resistor are respectively electrically connected with the master control circuit, a first end of the second resistor, a first end of the third resistor and a first end of the fourth resistor are all electrically connected with a second end of the fifth resistor; a first end of the fifth resistor is electrically connected with a second end of the sixth resistor and the voltage setting pin; a first end of the sixth resistor is electrically connected with the cathode of the first diode and the motor.

4. The fan power supply circuit according to any one of claims 1 to 3, wherein The fan comprises a battery; the power supply circuit further comprises a power supply switching circuit, a first input end of the power supply switching circuit being electrically connected with a charging access end, a second input end of the power supply switching circuit being electrically connected with the battery, an output end of the power supply switching circuit being electrically connected with the input end of the voltage conversion circuit; the power supply switching circuit is used for, when the charging access end is accessed, disconnecting the path between the battery and the voltage conversion circuit and turning on the path between the charging access end and the input end of the voltage conversion circuit.

5. The fan power supply circuit of claim 4, wherein, The power supply switching circuit comprises a seventh resistor, an eighth resistor, a second diode and a first switch tube; An anode of the second diode is electrically connected with the charging access end, and a cathode of the second diode is electrically connected with the second end of the first switch tube and the voltage conversion circuit; a first end of the first switch tube is electrically connected with the battery, and a controlled end of the first switch tube is electrically connected with a first end of the seventh resistor and a first end of the eighth resistor; a second end of the seventh resistor is electrically connected with the charging access end; and a second end of the eighth resistor is grounded.

6. The fan power supply circuit of any one of claims 1 to 3, wherein, The power supply circuit further comprises a trigger circuit, which is electrically connected with the main control circuit; the trigger circuit is used for outputting a corresponding trigger signal when triggered. The main control circuit is used for receiving the trigger signal and outputting a corresponding setting signal.

7. The fan power supply circuit of any one of claims 1 to 3, wherein, The power supply circuit further comprises a switch circuit, which is connected in series in an electrical loop between a power supply end of the motor and an output end of the voltage conversion circuit; a controlled end of the switch circuit is electrically connected with the main control circuit. The main control circuit is used for controlling the switch circuit to be in a closed or open state.

8. The fan power supply circuit of any one of claims 2-3, wherein, The power supply circuit further comprises a current detection circuit, which is electrically connected with the main control circuit; the current detection circuit is used for detecting a working current of the motor and outputting a corresponding current detection signal.

9. The fan power supply circuit of claim 8, wherein, The power supply circuit further comprises a switch circuit, which is connected in series in an electrical loop between a power supply end of the motor and an output end of the voltage conversion circuit; a controlled end of the switch circuit is electrically connected with the main control circuit; the switch circuit comprises a second switch tube and a ninth resistor; and the current detection circuit comprises a tenth resistor and a second capacitor. An first end of the second switch tube is electrically connected with the motor, a second end of the switch tube is electrically connected with a first end of the tenth resistor, a first end of the second capacitor and the main control circuit, a controlled end of the second switch tube is electrically connected with the main control circuit and a first end of the ninth resistor; a second end of the ninth resistor is connected with a second end of the tenth resistor and a second end of the first capacitor and grounded.

10. A fan, characterized by The fan comprises the fan power supply circuit and the battery, the charging access end, and the motor according to any one of claims 1 to 9.

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