PWM pulse regulating circuit for motor of range hood
A technology of pulse regulation and range hood, which is applied in the direction of electrical components, AC motor control, control system, etc., can solve the problems of high cost, high motor design requirements, and many components, and achieve strong common mode suppression ability and good electric current. Insulation ability and anti-interference ability, the effect of increasing reliability
Inactive Publication Date: 2011-03-30
SAKURA BATH & KITCHEN PRODS CHINA
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Problems solved by technology
[0003] This control method has high requirements on the design of the motor itself, and the control circuit part uses more components, so the cost is high
Method used
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Embodiment
[0013] Embodiment: A range hood motor PWM pulse regulation circuit, including an AC power supply and a motor M, the motor M is connected to the AC power supply after being connected in series with a capacitor C1 and a resistor R4, and also includes a single-chip microcomputer, a triode Q1, an optocoupler U1 and a controllable Silicon U2, the single-chip microcomputer outputs a PWM signal, and the single-chip microcomputer sends the PWM signal to the base of the triode Q1 through the first resistor R1, the emitter of the triode Q1 is grounded, and the collector of the triode Q1 is connected to the optocoupler U1 One end of the input end, the other end of the input end of the optocoupler U1 is connected to the set voltage through the second resistor R2, one end of the output end of the optocoupler U1 is connected to the control end of the thyristor U2, and one end of the output end of the optocoupler U1 is passed through The third resistor R3 is connected to one connection end of...
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The invention discloses a pulse width modulation (PWM) regulating circuit for a motor of a range hood. A singlechip outputs a PWM signal to drive a triode to be switched on or off; when the triode is switched on, a light emitting tube of an optical coupler works; a silicon controlled rectifier is driven to be switched on when the output end of the optical coupler is switched on; and the rotating speed of the motor is modulated by adopting the silicon controlled rectifier so that the motor can rotate at an expected speed. According to different requirements on the rotating speeds of the motor, the rotating speed of the motor can be regulated by only controlling the singlechip to output PWM control signals in different duty ratios. In the circuit, a single-coil alternating current motor can be adopted so that the structure of the motor is simplified; a control device is isolated and the silicon controlled rectifier is driven to be switched on by adopting the optical coupler; the input and the output of the optical coupler are isolated from each other and the transmission of electric signals has the characteristics of unidirectivity and the like, so that the circuit has high electrical insulating capacity and anti-jamming capability; and the input end of the optical coupler belongs to a low-resistance element for current-type work, so that the circuit has very high common-mode rejection capability; therefore, the work reliability of the singlechip can be increased greatly.
Description
technical field [0001] The invention relates to a motor rotation speed regulating circuit, in particular to a range hood motor PWM pulse regulating circuit. Background technique [0002] At present, the main control method of the range hood motor is to use an AC motor with multiple coil windings. Different coils correspond to different operating speeds of the motor, and multiple relays are used to switch the connection between the motor coil and the power supply voltage, so that the motor operates at different speeds. speed operation. [0003] This control method has higher requirements on the design of the motor itself, and the control circuit part uses more components, so the cost is high. Contents of the invention [0004] In order to overcome the above defects, the present invention provides a range hood motor PWM pulse adjustment circuit, the adjustment circuit can adjust the motor speed through the PWM signal, the circuit is simple and reliable, and the cost is low....
Claims
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Inventor 廖金柱
Owner SAKURA BATH & KITCHEN PRODS CHINA