Low-pressure floor fan control system

Abstract

The utility model discloses a low-voltage floor fan control system, and belongs to the technical field of fan control circuits. According to the utility model, a conventional power supply output by the adapter is used as a direct-current power supply VIN through the power supply circuit and supplies power to the whole system, and through the arrangement of the battery power supply circuit, power supply can be realized through a storage battery when the conventional power supply loses power; therefore, the application scene of the corresponding low-pressure floor fan is more flexible. In addition, when the adapter supplies power to the power source, the storage battery can be charged through the battery charging loop. In addition, the low-voltage floor fan control system can charge terminal equipment such as a mobile phone while controlling the fan to achieve air conditioning. And moreover, the fan rotating speed control circuit specifically controls the U phase, the V phase and the W phase of the rotating speed motor through three half-bridge driving chips Q2, Q3 and Q4 respectively, the waveform is closer to the working waveform of the motor, the noise is low, and the use efficiency is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of fan control circuits, and in particular relates to a low-voltage floor fan control system. Background Art

[0002] Industrial fans have a wide range of application scenarios, such as factory ventilation, air flow regulation, air purification, process heating, heatstroke prevention and cooling. In different scenarios, the requirements for fan air volume and air pressure are also different. For example, in local ventilation, higher air pressure and miniaturized fans are generally required, while in overall ventilation, higher air volume and lower air pressure are required. Generally speaking, industrial fans with air pressure standards above 100Pa are considered high-pressure fans, and industrial fans below 100Pa are considered low-pressure fans. During use, selecting the appropriate air pressure standard according to specific needs can better meet the needs of industrial production.

[0003] Traditional low-pressure fans generally use square wave control, which has a low power factor, is not energy-efficient, has high noise, has large startup fluctuations, and is not stable enough. In addition, existing pressure fans do not have a battery power supply system, and cannot switch freely when the voltage drops or the power is out of power without affecting the work. They do not have compatible mobile phone fast charging, synchronous motors, colored lights and other functions. It is impossible to achieve multiple uses of one machine. Utility Model Content

[0004] The purpose of this utility model is to provide a low-voltage floor fan control system, aiming to enhance the diversification of fan applications. This utility model is achieved through the following technical solutions:

[0005] A low-voltage floor fan control system includes a main control circuit, a power supply circuit and a fan speed control circuit. The power supply circuit uses the conventional power output by an adapter as a DC power supply VIN and supplies power to the entire system. The fan speed control circuit is controlled by the main control circuit to drive the speed motor of the low-voltage floor fan. The feature is that it also includes a battery power supply circuit. When the main control circuit detects that the power supply circuit loses power, it controls the battery power supply circuit to use the backup power of the battery as the DC power supply VIN to supply power to the entire system.

[0006] As a specific technical solution, the battery power supply circuit includes a battery charging circuit, and the charging circuit charges the battery when the power supply circuit supplies power.

[0007] As a specific technical solution, the battery power supply circuit includes a battery voltage sampling circuit, which samples the output voltage of the battery and provides a battery voltage sampling signal to the main control circuit.

[0008] As a specific technical solution, the power supply circuit includes a DC power supply voltage sampling circuit, which samples the DC power supply VIN and provides a DC power supply voltage sampling signal to the main control circuit.

[0009] As a further technical solution, the low-voltage floor fan control system also includes a fan shaking control circuit, and the fan shaking control circuit is controlled by the main control circuit to drive the shaking motor of the low-voltage floor fan.

[0010] As a further technical solution, the low-voltage floor fan control system also includes a fast charging circuit, and the fast charging circuit is controlled by the main control circuit to charge the power receiving device connected thereto.

[0011] As a specific technical solution, the fan speed control circuit controls the U phase, V phase, and W phase of the speed motor respectively through three half-bridge drive chips Q2, Q3, and Q4.

[0012] As a specific technical solution, the fan oscillation control circuit controls the oscillation motor through a DC motor drive chip.

[0013] As a further technical solution, the fast charging circuit includes a voltage conversion circuit and a fast charging protocol control circuit. The voltage conversion circuit converts the DC power supply VIN into a charging power supply VOUT via DC-DC and provides it to the fast charging protocol control circuit; the fast charging protocol control circuit is connected to the charging interface of the powered device, reads the feedback signal FB of the executable charging voltage of the powered device, and the voltage conversion circuit controls the voltage of the charging power supply VOUT according to the feedback signal FB and transmits it to the powered device by the fast charging protocol control circuit.

[0014] As a further technical solution, the low-voltage floor fan control system also includes an acoustic and optical control circuit, and the acoustic and optical control circuit is controlled by the main control circuit to drive the acoustic and optical equipment connected thereto.

[0015] The low-voltage floor fan control system provided by the above technical solution can not only convert the mains power into a DC power supply through an adapter to supply power, but also supply power through a battery when the mains power is cut off; this makes the application scenario of the corresponding low-voltage floor fan more flexible. Moreover, when the adapter is supplying power, the battery can also be charged. In addition, the low-voltage floor fan control system provided by the above technical solution can charge terminal devices such as mobile phones (i.e., powered devices) while controlling the fan to achieve air conditioning. Furthermore, the fan speed control circuit controls the U phase, V phase, and W phase of the speed motor through three half-bridge drive chips Q2, Q3, and Q4 respectively, and the waveform is closer to the working waveform of the motor, with low noise and high efficiency. In addition, the low-voltage floor fan control system provided by the above technical solution can also realize the fan's shaking function through the fan shaking control circuit. Finally, the low-voltage floor fan control system provided by the above technical solution can also realize functions such as colored light lighting through the sound and light control circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a block diagram of the low-voltage fan control system provided in a specific implementation manner of the utility model.

[0017] Figure 2 This is a schematic diagram of a main control circuit in a low-voltage fan control system provided in a specific implementation manner of the utility model.

[0018] Figure 3 A schematic diagram of a power supply circuit and a battery power supply circuit in a low-voltage fan control system provided in a specific implementation manner of the utility model.

[0019] Figure 4 The schematic diagram of the DC power supply voltage sampling circuit in the low-voltage fan control system provided by the specific implementation mode of the utility model.

[0020] Figure 5 A schematic diagram of a battery voltage sampling circuit in a low-voltage fan control system provided in a specific implementation manner of the utility model.

[0021] Figure 6 The schematic diagram of the fan speed control circuit in the low-voltage fan control system provided by the specific implementation mode of the utility model.

[0022] Figure 7 A schematic diagram of a current sampling circuit in a fan speed control circuit in a low-voltage fan control system provided in a specific implementation manner of the utility model.

[0023] Figure 8 The schematic diagram of the fan shaking control circuit in the low-voltage fan control system provided by the specific implementation mode of the utility model.

[0024] Fig. 9A schematic diagram of a voltage conversion circuit in a fast charging circuit in a low-voltage fan control system provided in a specific embodiment of the utility model.

[0025] Fig.10 A schematic diagram of a fast charging protocol control circuit in a fast charging circuit in a low-voltage fan control system provided in a specific implementation manner of the utility model. DETAILED DESCRIPTION

[0026] The specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. The technical features of the specific embodiments can be used interchangeably without conflicting with each other. In addition, the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0027] Combination Figure 1 As shown, the low-voltage floor fan control system provided in this embodiment includes a main control circuit, a human-computer interaction circuit, a power supply circuit, a battery power supply circuit, a fan speed control circuit, a fan head shaking control circuit, a fast charging circuit and an audio-visual control circuit.

[0028] The power supply circuit is used to use the conventional power supply as the DC power supply VIN to supply power to the entire system. The conventional power supply here refers to the DC power supply converted from the AC power supply (such as the mains) by the adapter. The battery power supply circuit is used to use the backup power supply of the battery as the DC power supply VIN to supply power to the entire system. When the main control circuit detects that the power supply circuit loses power, it controls the battery power supply circuit to provide the DC power supply VIN to the entire system through the battery.

[0029] The main control circuit is used to integrate and control the human-computer interaction circuit, power supply circuit, battery power supply circuit, fan speed control circuit, fan head shaking control circuit, fast charging circuit and sound and light control circuit to realize the functions of each circuit; at the same time, the main control circuit is also used to sample and protect the voltage and current of some circuits to make the whole system safer and more stable. Figure 2 As shown, in this embodiment, the main control circuit is composed of a main control chip U1 and its peripheral circuits; the main control chip U1 uses a RX32SD22 chip, which provides multiple signal acquisition terminals and control output terminals, and the relevant functional terminals will be described in detail below.

[0030] Combination Figure 3 As shown in the figure, when the power supply circuit is working normally, the power is supplied from VIA to provide DC power VIN to other circuits in the system. The diode D1 is forward-conducting to prevent the capacitor from being burned out due to reverse connection of positive and negative poles. The voltage-stabilizing diode ZD1 prevents other components from being burned out when transient high voltage is generated. Figure 4As shown, the power supply circuit includes a DC power supply voltage sampling circuit, which samples the DC power supply VIN and provides the DC power supply voltage sampling signal to the VBUS sampling terminal of the main control circuit. When the main control circuit detects that the power supply circuit loses power, it controls the battery power supply circuit to provide the DC power supply VIN to the entire system through the battery. When the DC power supply voltage sampling signal is too low or there is no power, the main control circuit controls the battery power supply circuit to provide the DC power supply VIN to the entire system through the battery through the control output terminal of VIN_BAT_CTRL.

[0031] Continue to see Figure 3 As shown, the battery power supply circuit includes a storage capacitor EC1, a field effect transistor Q1 and a transistor Q11; wherein, when the DC power supply voltage sampling signal is too low or there is no power supply, the main control circuit controls the transistor Q11 to saturate conduction through the control output terminal of VIN_BAT_CTRL, and then controls the field effect transistor Q1 to forward conduct, so that the battery supplies power to the entire system.

[0032] In addition, the battery power supply circuit includes a battery charging circuit, which charges the battery when the power supply circuit supplies power. Specifically, when the power supply circuit works normally, the field effect transistor Q1 is reversely conducted and serves as the battery charging circuit. At this time, the power supply is supplied from VIA and charges the battery after passing through the field effect transistor Q1.

[0033] In addition, the battery power supply circuit also includes a battery voltage sampling circuit, which samples the output voltage of the battery and provides a battery voltage sampling signal to the main control circuit. Figure 5 As shown, the battery voltage sampling circuit samples from the VBAT of the battery power supply circuit and provides the battery voltage sampling signal to the VBAT sampling terminal of the main control circuit. The main control circuit controls whether the battery power supply circuit continues to work according to the state of the battery voltage sampling signal.

[0034] Combination Figure 1 and Figure 6 As shown, the fan speed control circuit is controlled by the main control circuit to drive the speed motor of the low-voltage floor fan; specifically, the fan speed control circuit controls the U phase, V phase, and W phase of the speed motor through three half-bridge drive chips Q2, Q3, and Q4 respectively. Each half-bridge drive chip is mainly composed of a PMOS and an NMOS, and controls the conduction of the half bridge through G1 and G2 to simulate a sine wave, and controls the U phase, V phase, and W phase of the speed motor respectively. The waveform is closer to the working waveform of the motor, with low noise and high efficiency.

[0035] In addition, the fan speed control circuit also includes a current sampling circuit, see Figure 6The current sampling circuit collects the working current of the half-bridge driver chip Q2 through the IR_U terminal of the half-bridge driver chip Q2 and provides it to the IR_U sampling terminal of the main control circuit; collects the working current of the half-bridge driver chip Q3 through the IR_V terminal of the half-bridge driver chip Q3 and provides it to the IR_V sampling terminal of the main control circuit; in addition, see Figure 7 As shown, the current sampling circuit also samples the main current I_SHUNT of the fan speed control circuit through at least two sampling resistors R12 and R20 and provides it to the I_SHUNT sampling terminal of the main control circuit. Through the above current sampling, the main control circuit further outputs a suitable PWM drive signal through the control output terminals UL, UH, VL, VH, WL, and WH to control the speed motor to work stably.

[0036] Combination Figure 1 and Figure 8 As shown, the low-voltage floor fan control system also includes a fan oscillation control circuit, which is controlled by the main control circuit to drive the oscillation motor of the low-voltage floor fan. The fan oscillation control circuit controls the oscillation motor through a DC motor driver chip. Through the DC motor driver chip, the input is pulse-width modulated (PWM) to control the motor speed, and the built-in synchronous rectification control circuit can reduce the chip power consumption during PWM operation.

[0037] The fast charging circuit includes a voltage conversion circuit and a fast charging protocol control circuit. Fig. 9 As shown, the voltage conversion circuit converts the DC power supply VIN into a charging power supply VOUT via DC-DC, and provides it to the fast charging protocol control circuit; combined with Fig.10 As shown, the fast charging protocol control circuit is connected to the charging interface of the powered device, and reads the feedback signal FB of the executable charging voltage of the powered device. The voltage conversion circuit controls the voltage of the charging power supply VOUT according to the feedback signal FB and is transmitted to the powered device (such as a mobile phone or other terminal) by the fast charging protocol control circuit, that is, by parsing the fast charging protocols of different mobile phones, matching the voltage and power output by the DC-DC circuit, fast charging of different mobile phones is achieved. Specifically, U2 is a DC-DC chip, which mainly plays the role of constant current and voltage reduction, for example, it can be controllably reduced to 12V, 9V, and 5V. The LX2 power inductor and EC2 electrolytic capacitor play the role of energy storage. At the same time, the output voltage of the power supply output is adjusted through the protocol chip U3 and the resistors R2 and R6 control resistors to optimize the charging time. In addition, R8 is a sampling resistor, which safely and reliably controls the charging time and power of the mobile phone.

[0038] In addition, the human-computer interaction circuit is used to communicate with the main control circuit through buttons, touch screens, etc. to realize functions such as the generation of control instructions and the display of information. Finally, the sound and light control circuit is used to realize functions such as colored light lighting, music playing, and warning reminders under the control of the main control circuit.

[0039] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the technical solution of the present invention are still within the scope covered by the present application.

Claims

1. A low-voltage floor fan control system, comprising a main control circuit, a power supply circuit and a fan speed control circuit, wherein the power supply circuit uses the conventional power output by the adapter as a DC power supply VIN and supplies power to the entire system, and the fan speed control circuit is controlled by the main control circuit to drive the speed motor of the low-voltage floor fan; characterized in that: It also includes a battery power supply circuit. When the main control circuit detects that the power supply circuit loses power, it controls the battery power supply circuit to use the backup power of the battery as the DC power supply VIN to supply power to the entire system.

2. The low-voltage floor fan control system according to claim 1, characterized in that: The battery power supply circuit comprises a battery charging circuit, and the charging circuit charges the storage battery when the power supply circuit supplies power.

3. The low-voltage floor fan control system according to claim 2, characterized in that: The battery power supply circuit comprises a battery voltage sampling circuit, which samples the output voltage of the battery and provides a battery voltage sampling signal to the main control circuit.

4. The low-voltage floor fan control system according to claim 1, characterized in that: The power supply circuit includes a DC power supply voltage sampling circuit, which samples the DC power supply VIN and provides a DC power supply voltage sampling signal to the main control circuit.

5. The low-voltage floor fan control system according to claim 1, characterized in that: It also includes a fan shaking control circuit, which is controlled by the main control circuit to drive the shaking motor of the low-voltage floor fan.

6. The low-voltage floor fan control system according to claim 1, characterized in that: It also includes a fast charging circuit, which is controlled by the main control circuit to charge the powered device connected to it.

7. The low-voltage floor fan control system according to claim 1, characterized in that: The fan speed control circuit controls the U phase, V phase and W phase of the speed motor respectively through three half-bridge drive chips Q2, Q3 and Q4.

8. The low-voltage floor fan control system according to claim 5, characterized in that: The fan oscillation control circuit controls the oscillation motor via a DC motor drive chip.

9. The low-voltage floor fan control system according to claim 6, characterized in that: The fast charging circuit includes a voltage conversion circuit and a fast charging protocol control circuit. The voltage conversion circuit converts the DC power supply VIN into a charging power supply VOUT via DC-DC and provides it to the fast charging protocol control circuit; the fast charging protocol control circuit is connected to the charging interface of the powered device, reads the feedback signal FB of the executable charging voltage of the powered device, and the voltage conversion circuit controls the voltage of the charging power supply VOUT according to the feedback signal FB and transmits it to the powered device by the fast charging protocol control circuit.

10. The low-voltage floor fan control system according to claim 1, characterized in that: The low-voltage floor fan control system also includes an acoustic and optical control circuit, and the acoustic and optical control circuit is controlled by the main control circuit to drive the acoustic and optical equipment connected thereto.

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