CN117013912A - Stepless speed regulating controller and range hood using same - Google Patents

Stepless speed regulating controller and range hood using same Download PDF

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Publication number
CN117013912A
CN117013912A CN202210452395.3A CN202210452395A CN117013912A CN 117013912 A CN117013912 A CN 117013912A CN 202210452395 A CN202210452395 A CN 202210452395A CN 117013912 A CN117013912 A CN 117013912A
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CN
China
Prior art keywords
circuit
signal
resistor
bridge
controller
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CN202210452395.3A
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Chinese (zh)
Inventor
邹杰锋
郑高辉
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Zhejiang Connal Electrical Appliance Co ltd
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Zhejiang Connal Electrical Appliance Co ltd
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Priority to CN202210452395.3A priority Critical patent/CN117013912A/en
Publication of CN117013912A publication Critical patent/CN117013912A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
    • H02P23/0004—Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2021—Arrangement or mounting of control or safety systems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Control Of Direct Current Motors (AREA)

Abstract

The invention relates to a stepless speed regulating controller, which comprises a rectifying circuit, a regulating circuit and a control circuit, wherein the rectifying circuit is used for taking power from mains supply and rectifying alternating voltage of the mains supply into a direct current pulse signal of 100 Hz; the zero extraction circuit is used for collecting a 100Hz direct current pulse signal, sequentially passing the 100Hz direct current pulse signal through resistors R17, R18 and R19 to the b pole of a triode Q5, and converting the 100Hz direct current pulse signal into a zero crossing pulse signal by the conducting voltage of the triode Q5 through the resistor R13 to the c pole thereof; the controller is used for being connected with the zero extraction circuit to collect zero-crossing pulse signals, the controller transmits the zero-crossing pulse signals to the signal modulation circuit, and the signal modulation circuit outputs H-bridge control signals; and the H-bridge control circuit is connected with the signal modulation circuit and is used for converting the H-bridge control signal into a driving signal and outputting the driving signal to the motor. The invention is used for improving the reliability of the stepless speed regulating controller.

Description

Stepless speed regulating controller and range hood using same
Technical Field
The invention relates to the technical field of motor stepless speed regulation controllers, in particular to a stepless speed regulation controller and a range hood using the same.
Background
An existing stepless speed regulating controller, such as an ac fan speed regulator with the patent application number CN202010266087, is connected with an ac fan, and includes: the zero-crossing detection module is used for outputting a pulse signal when detecting the zero position of the accessed alternating current power supply; the follow current module is used for carrying out follow current discharge on the fan according to the pulse signals; the control module is used for outputting a control waveform according to the pulse signal and an external input signal; the chopper modulation module is used for switching on or switching off the power supply of the fan according to the control waveform; one end of the fan power supply is connected with one path of the alternating current power supply, and the other end of the fan power supply is connected with the chopper modulation module. The stepless speed regulation controller adopts a high-frequency chopper control mechanism to realize stepless speed regulation, outputs modulation signals with different widths according to the requirements of external speed regulation signals, and performs chopper modulation on an input power supply through a chopper tube, so that the stepless speed regulation controller can be used for replacing the traditional alternating current fan speed regulator.
The zero signal extraction mode of the stepless speed regulation controller is as follows: the zero detection module directly passes through the positive and negative frequency of the mains supply to obtain zero-crossing signals, the positive and negative frequency of the mains supply can be collected by the zero-crossing detection module through a plurality of filter capacitors, and the filter capacitors have charge and discharge characteristics which can cause time delay for signal extraction, so that the mains supply is collected by the zero-crossing detection module after passing through the plurality of filter capacitors, the zero-crossing detection module outputs converted pulse signals, and in the process, the delayed pulse signals easily cause distortion of waveforms output by the driving circuit.
Meanwhile, as the carrier frequency of the stepless speed regulation controller of the fan system of the existing range hood is not high, the noise of the load motor is obvious, and the use experience of a user is reduced.
Disclosure of Invention
The invention aims to provide a stepless speed regulating controller with high reliability aiming at the defects of the existing stepless speed regulating controller.
In order to achieve the above object, the present invention provides a stepless speed regulating controller, comprising:
a rectifying circuit for taking power from the commercial power and rectifying an alternating voltage of the commercial power into a direct current pulsating signal of 100 Hz;
the zero extraction circuit is used for being connected with the rectification circuit to collect a 100Hz direct current pulse signal, the 100Hz direct current pulse signal sequentially passes through a resistor R17, a resistor R18 and a resistor R19 which are connected in series to the b pole of the triode Q5, the ground is connected between the e pole of the triode Q5 and the b pole of the triode Q5, the conducting voltage of the triode Q5 passes through a resistor R13 to the c pole of the triode Q5, and the resistor R13 and the triode Q5 convert the 100Hz direct current pulse signal into a zero crossing pulse signal;
the controller is used for being connected with the zero extraction circuit to collect zero-crossing pulse signals, the controller is connected with the signal modulation circuit, the controller transmits the zero-crossing pulse signals to the signal modulation circuit, and the signal modulation circuit is used for outputting H-bridge control signals;
and the H-bridge control circuit is connected with the signal modulation circuit and is used for converting the H-bridge control signal into a driving signal and outputting the driving signal to the motor.
Further, the device also comprises a PWM generating circuit which is used for generating PWM signals with continuously adjustable duty ratio, the PWM generating circuit is connected with the signal modulating circuit for transmitting the PWM signals, and the signal modulating circuit converts the zero-crossing pulse signals and the PWM signals into H-bridge control signals with 50Hz pulse width adjustable.
Further, the PWM generation circuit includes a potentiometer R12, a triode Q6, and an operational amplifier comparator U4, where the controller is connected with the operational amplifier comparator U4, the operational amplifier comparator U4 is connected with the b pole of the triode Q6, the e pole of the triode Q6 is grounded, and the c pole of the PWM generation circuit is connected with the signal modulation circuit.
Further, the H bridge control circuit comprises an H bridge driving circuit and an H bridge alternating current voltage regulating circuit which are connected with each other, the H bridge driving circuit is used for amplifying an H bridge control signal and transmitting the H bridge control signal to the H bridge alternating current voltage regulating circuit, and the H bridge alternating current voltage regulating circuit is used for outputting a driving signal of the motor according to a direct current pulse signal of 100Hz and the H bridge control signal.
Further, the signal modulation circuit comprises a resistor R3, a resistor R4, a resistor R6, a resistor R8, a diode D3 and a diode D4, different output pins of the controller are respectively connected through the resistor R3, the resistor R4, the resistor R6 and the resistor R8, the resistor R3, the resistor R4, the resistor R6 and the resistor R8 are respectively used for transmitting different control signals of the controller to the H bridge control circuit, the output end of the PWM generation circuit is divided into two branches, one branch is connected to a connection node of the resistor R6 and the H bridge control circuit through the diode D3, and the other branch is connected to a connection node of the resistor R3 and the H bridge control circuit through the diode D4.
Further, the H bridge driving circuit comprises a driving chip U2 and a driving chip U3, the H bridge alternating current voltage regulating circuit comprises MOSFET switching tubes Q1 to Q4, different output pins of the controller are respectively connected with the driving chip U2 and the driving chip U3, driving signals sent by two time sharing of the driving chip U2 are respectively transmitted to the motor through the MOSFET switching tubes Q1 and Q2, and driving signals sent by two time sharing of the driving chip U3 are respectively transmitted to the motor through the MOSFET switching tubes Q3 and Q4.
Further, in one of the dc pulse periods, the MOSFET switch Q1 and the MOSFET switch Q4 are turned on, and the MOSFET switch Q3 and the driving MOSFET switch Q2 are turned off; in another DC pulse period, the MOSFET switch transistors Q3 and Q2 are turned on, and the MOSFET switch transistors Q1 and Q4 are turned off.
Further, in the state that the MOSFET switch tube Q1 and the MOSFET switch tube Q4 are turned on, the MOSFET switch tube Q4 is fully turned on and is used for transmitting a driving signal of the motor, and the MOSFET switch tube Q1 is turned on or off according to the H-bridge control signal and is used for controlling the amplitude of a sine wave positive half-cycle driving signal of the motor; under the state that the MOSFET switch tube Q3 and the MOSFET switch tube Q2 are conducted, the MOSFET switch tube Q2 is fully conducted and is used for transmitting a driving signal of the motor, and the MOSFET switch tube Q3 is conducted or disconnected according to the H-bridge control signal and is used for controlling the amplitude of a sine wave negative half-cycle driving signal of the motor.
Further, the rectifying circuit comprises a primary power supply filtering circuit, a secondary power supply filtering circuit and a rectifying bridge pile DG which are sequentially connected, the primary power supply filtering circuit comprises an inductor T1 and a capacitor C7 which are mutually connected in parallel, and the secondary power supply filtering circuit comprises an inductor T2 and a capacitor C8 which are connected in parallel.
A range hood using the above speed regulation controller, the range hood comprising: the device comprises a shell, a smoke inlet, a smoke outlet, a cavity arranged in the shell, a fan system arranged in the cavity and a stepless speed regulating controller, wherein a fan in the fan system is electrically connected with the stepless speed regulating controller, and the stepless speed regulating controller is arranged above the fan.
The invention has the beneficial effects that:
according to the stepless speed regulation controller, the zero point extraction circuit directly extracts zero crossing pulses from 100Hz pulsating direct current of the mains supply rectifying circuit, and a signal filter capacitor is not required to be built in the zero point extraction circuit to realize zero crossing point pulses, so that the time delay problem of zero crossing pulse extraction does not exist, waveforms output by the driving circuit are not distorted, and the reliability of a system is further improved.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also throughout the drawings, identical reference numerals are used to designate identical elements.
In the drawings:
FIG. 1 shows a flow chart of an implementation of the present invention;
FIG. 2 is a circuit diagram of a portion of the present invention;
fig. 3 is a circuit diagram of another portion of the present invention.
Description of the reference numerals:
1-a rectifying circuit; a 2-zero extraction circuit; 3-a controller; a 4-PWM generation circuit; a 5-signal modulation circuit; a 6-H bridge driving circuit; 7-H bridge alternating current voltage regulating circuit.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the invention is further described in detail below with reference to the embodiments. It should be understood, however, that the description herein of specific embodiments is for the purpose of illustrating the invention only and is not intended to limit the invention.
Referring to fig. 1 to 3, a stepless speed regulating controller of the present embodiment includes:
a rectifying circuit 1 for taking power from a commercial power and rectifying an ac voltage of 220V input from the commercial power into a dc ripple signal of 100 Hz;
the zero point extraction circuit 2 is used for collecting a 100Hz direct current pulse signal connected with the rectification circuit 1, the 100Hz direct current pulse signal sequentially passes through a resistor R17, a resistor R18 and a resistor R19 which are connected in series to the b pole of the triode Q5, the ground is connected between the e pole of the triode Q5 and the b pole of the triode Q5, the conducting voltage of the triode Q5 passes through a resistor R13 to the c pole of the triode Q5, the resistor R13 and the triode Q5 convert the 100Hz direct current pulse signal into a zero crossing pulse signal, the zero point extraction circuit 2 extracts the zero crossing pulse signal of the 100Hz direct current pulse generated by the rectification circuit 1, and the level conversion is formed by the resistor R13 and the triode Q5 to generate a zero crossing pulse signal compatible with the input/output of the controller 3;
the controller 3 is a singlechip with a common IO port with a digital-to-analog conversion function. (e.g., PIC10F204, SN8P2501B, etc.) for collecting zero-crossing pulse signals in connection with the zero-point extraction circuit 2, the controller 3 transmits the zero-crossing pulse signals to the signal modulation circuit 5, and the signal modulation circuit 5 outputs H-bridge control signals;
and the H-bridge control circuit is connected with the signal modulation circuit and is used for converting the H-bridge control signal into a driving signal and outputting the driving signal to the motor.
Further, the PWM generating circuit is used for generating PWM signals with continuously adjustable duty ratio, the PWM generating circuit is connected with the signal modulating circuit for transmitting the PWM signals, and the signal modulating circuit converts zero-crossing pulse signals and the PWM signals into H-bridge control signals with adjustable pulse width of 16-18 KHz.
Further, the PWM generation circuit includes a potentiometer R12, a triode Q6, and an operational amplifier comparator U4, where the controller is connected with the operational amplifier comparator U4, the operational amplifier comparator U4 is connected with the b pole of the triode Q6, the e pole of the triode Q6 is grounded, and the c pole of the PWM generation circuit is connected with the signal modulation circuit.
The PWM generation circuit 4 includes a resistor R11, a resistor R14, a resistor R15, a resistor R10, a resistor R20, a resistor R21, a resistor R23, a resistor R22, a resistor R16, a transistor Q6, a potentiometer R12, and an operational amplifier comparator U4, and the potentiometer R12 is used for adjusting the pulse high level width of the PWM signal. The PWM generation circuit 4 is used for generating PWM signals with continuously adjustable duty ratio, the high level width of PWM pulses is adjusted by changing the potentiometer R12, then sine wave voltages (PWM signals) with different amplitudes are obtained, the PWM signals are equal duty ratio signals, the PWM generation circuit 4 is connected with the signal modulation circuit 5 for transmitting the PWM signals, the signal modulation circuit 5 converts the zero crossing pulse signals and the PWM signals into H-bridge control signals with adjustable pulse width of 16-18KHz, and the chopper homoratio voltage adjustment process is further achieved.
Further, the H-bridge control circuit includes an H-bridge driving circuit 6 and an H-bridge ac voltage regulating circuit 7,H, where the H-bridge driving circuit 6 is configured to amplify the H-bridge control signal and transmit the H-bridge control signal to the H-bridge ac voltage regulating circuit 7,H, and the H-bridge ac voltage regulating circuit 7 outputs a driving signal of the motor according to the dc pulsation signal of 100Hz and the H-bridge control signal.
Further, the signal modulation circuit 5 includes a resistor R3, a resistor R4, a resistor R6, a resistor R8, a diode D3, and a diode D4, the H-bridge driving circuit 6 includes a driving chip U2, a driving chip U3, a diode D1, a diode D2, a capacitor C3, a capacitor C4, and a capacitor C5, the H-bridge ac voltage regulation circuit 7 includes a MOSFET switch Q1 to a MOSFET switch Q4, a resistor R1, a resistor R5, a resistor R7, and a resistor R9, an RC0 pin of the controller 3 is connected with an upper arm of the driving chip U2 through the resistor R3, an RC1 pin of the controller 3 is connected with an upper arm of the driving chip U2 through the resistor R4, an RC3 pin of the controller 3 is connected with a lower arm of the driving chip U3 through the resistor R8, an output end of the generating circuit 4 is divided into two branches, one branch is connected with an upper arm of the MOSFET 3 through the upper arm of the resistor R3 and the upper arm of the driving chip U3 through the MOSFET 3, and an output channel of the PWM 3 is not connected with an output channel Q2 through the MOSFET 3 through the upper end of the MOSFET 3 and the MOSFET 3 through the upper end of the MOSFET 3R 2, and the upper end of the MOSFET 3 is connected with an output channel Q2 through the high end of the MOSFET 2 and the MOSFET 2 through the MOSFET 3 2. The connected PWM generating circuit and signal modulating circuit 5 generate DC chopping signals, and chopping voltage regulation is realized by driving chopper tubes Q1 and Q3 of the H-bridge AC voltage regulating circuit through the H-bridge driving circuit, so that the chopping frequency of the final driving motor reaches 16-18KHz, and the current waveform approaches to a sine wave.
Further, in one of the dc pulse periods, the MOSFET switch Q1 and the MOSFET switch Q4 are turned on, and the MOSFET switch Q3 and the driving MOSFET switch Q2 are turned off; in another DC pulse period, the MOSFET switch transistors Q3 and Q2 are turned on, and the MOSFET switch transistors Q1 and Q4 are turned off.
Further, in the state that the MOSFET switch tube Q1 and the MOSFET switch tube Q4 are turned on, the MOSFET switch tube Q4 is fully turned on and is used for transmitting a driving signal of the motor, the MOSFET switch tube Q1 is turned on or off according to the H-bridge control signal and is used for controlling the amplitude of a sine wave positive half-cycle driving signal of the motor, and the longer the turn-on time is, the higher the sine wave voltage amplitude output to the motor is, and the faster the motor rotation speed is; under the state that the MOSFET switch tube Q3 and the MOSFET switch tube Q2 are conducted, the MOSFET switch tube Q2 is fully conducted and is used for transmitting a driving signal of the motor, the MOSFET switch tube Q3 is conducted or disconnected according to the H-bridge control signal and is used for controlling the amplitude of a sine wave negative half-cycle driving signal of the motor, and the longer the conduction time is, the higher the amplitude of sine wave voltage output to the motor is, and the faster the motor rotating speed is.
Further, the rectifying circuit 1 includes a primary power supply filtering circuit, a secondary power supply filtering circuit and a rectifier bridge DG, which are sequentially connected, the primary power supply filtering circuit includes an inductance T1 and a capacitance C7 connected in parallel, and the secondary power supply filtering circuit includes an inductance T2 and a capacitance C8 connected in parallel. The rectifier bridge pile DG converts the input alternating current of the speed regulation controller 3 into 100Hz pulsating direct current, so that the rectifier circuit 1 of the embodiment does not need capacitive filtering, the production cost of the circuit can be reduced, the problem of signal delay existing in the capacitor can be solved without capacitive filtering, and meanwhile, under the condition that the pulsating direct current is subsequently reduced into 50Hz voltage-adjustable alternating current, the power factor cannot be reduced due to load current or sine wave after voltage regulation.
A range hood using the above speed regulation controller 3, the range hood comprising: the fan in the fan system is electrically connected with the stepless speed regulating controller 3, and the stepless speed regulating controller 3 is arranged above the fan. In the embodiment, the stepless speed regulating controller 3 is arranged in the range hood, and the continuous regulation of the rotating speed of the fan is realized through the stepless speed regulating controller 3, so that the range hood is more suitable for the requirements of users. Meanwhile, the H-bridge structure can solve the current follow current problem of the alternating current motor when the PWM pulse is turned off, the current of the alternating current motor is continuous in the mains supply period, the eddy current loss of the motor is not increased, and therefore the temperature rise of the motor is reduced, and the overall efficiency is improved. A man-machine control board is arranged in the face frame of the shell, and the controlled end of the potentiometer R12 is arranged on the man-machine control board. So that the user inputs the desired pulse width.
With the increase of the carrier frequency of the speed regulation controller, experiments have found that the higher the operating frequency is, the larger the duty cycle of the voltage wave is, the smaller the current higher harmonic component is, i.e. the higher the carrier frequency is, the better the smoothness of the current waveform is, under the condition of increasing to 16KHZ or higher. The circuit of this embodiment has very little higher harmonic component, and simultaneously, when the motor operation is at carrier drive signal of high frequency, its vibration frequency has improved very much for the metal ringing statement when the motor vibrates shows to reduce to the degree that surpasses the human ear and perceivable and consequently "disappear", and the human ear can't hear the vibration sound of motor, and then realizes low noise transmission. By increasing the carrier frequency, the current waveform of the motor (particularly the current of the motor at low speed) tends to be more sinusoidal, so that the pulsation and loss of the motor torque are reduced.
The specific working process is as follows:
the PWM generation circuit 4 generates a pulse width modulation carrier signal, and synthesizes the carrier signal with the zero crossing pulse signal acquired by the controller 3 to generate an H-bridge control signal. The 7 th pin (B2-L) of the controller 4 generates a switching signal of switching on the positive half cycle and switching off the negative half cycle of the sine wave, and the switching signal is used for driving the MOS tube Q4 to be switched on and off; the 10 th leg (B1-H) and the 7 th leg (B2-L) of the controller 4 are synchronized, and a sine wave positive half-cycle pulse width voltage regulating signal is generated after being subjected to AND with a pulse width modulation carrier signal logic phase output by the triode Q6 of the PWM generating circuit and is used for driving the pulse width voltage regulating of the MOS tube Q1.
The 9 th leg (B1-L) of the controller 4 generates a switching signal of switching on the negative half cycle and switching off the positive half cycle of the sine wave, and the switching signal is used for driving the MOS tube Q2 to be switched on and off; the 8 th pin (B2-H) and the 9 th pin (B1-L) of the controller 4 are synchronized, and a sine wave negative half-cycle pulse width voltage regulating signal is generated after the logical phase AND of the pulse width modulation carrier signal output by the triode Q6 of the PWM generating circuit is adopted for driving the pulse width voltage regulating of the MOS tube Q3.
In the H bridge alternating current voltage regulating circuit: (1) The MOS tube Q4 is used as a first main switch and is responsible for switching on the positive half cycle and switching off the negative half cycle of the sine wave; the MOS tube Q1 is used as a first chopping voltage regulating switch, and the voltage amplitude is regulated by PWM pulse width modulation signals when the sine wave is in the positive half cycle. (2) The MOS tube Q2 is used as a second main switch and is responsible for switching on the negative half cycle and switching off the positive half cycle of the sine wave; and the MOS tube Q3 is used as a second chopping voltage regulating switch, and the PWM pulse width modulation signal is used for regulating voltage and regulating voltage amplitude when the sine wave is in the negative half cycle.
In the whole working period of the controller, the positive half cycle and the negative half cycle of the two chopper tubes work alternately, and the reliability is doubled.
The embodiment has the following beneficial effects:
the rectifier circuit 1 is used for generating 100Hz pulsating direct current, then the zero-crossing pulse signal is extracted through the zero-point extraction circuit 2, and capacitive filtering is not needed in the zero-point extraction circuit 2, so that the complexity of circuit composition is reduced, the problem of waveform distortion of the output of the H-bridge control circuit caused by the charge-discharge delay characteristic of a capacitor is avoided, in the embodiment, through the characteristic that only two of four MOSFET switching tubes are conducted in the same pulsation period in the H-bridge alternating current voltage regulating circuit 7, the switching tubes of the same bridge arm are switched at the zero-crossing point of the mains supply, the bus voltage is close to 0V, the risk of common-state conduction of the same bridge arm is reduced, 100Hz pulsating direct current is reduced to 50Hz voltage-adjustable alternating current, the power factor is not reduced due to load current or sine wave after voltage regulation, and the speed regulating controller 3 is ensured to work safely and reliably; in one DC pulse period, only 2 MOSFET tubes are in a working state, the other 2 MOSFET tubes are in a closing state, 1 of the 2 MOSFET tubes in the working state are fully conducted, and the other 1 MOSFET tubes are in a pulse switching mode, so that the power consumption of the whole H bridge can be reduced to about 50%, and the energy-saving and environment-friendly effects are achieved.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention.

Claims (10)

1. A stepless speed regulating controller, comprising:
a rectifying circuit for taking power from the commercial power and rectifying an alternating voltage of the commercial power into a direct current pulsating signal of 100 Hz;
the zero extraction circuit is used for being connected with the rectification circuit to collect a 100Hz direct current pulse signal, the 100Hz direct current pulse signal sequentially passes through a resistor R17, a resistor R18 and a resistor R19 which are connected in series to the b pole of the triode Q5, the ground is connected between the e pole of the triode Q5 and the b pole of the triode Q5, the conducting voltage of the triode Q5 passes through a resistor R13 to the c pole of the triode Q5, and the resistor R13 and the triode Q5 convert the 100Hz direct current pulse signal into a zero crossing pulse signal;
the controller is used for being connected with the zero extraction circuit to collect zero-crossing pulse signals, the controller is connected with the signal modulation circuit, the controller transmits the zero-crossing pulse signals to the signal modulation circuit, and the signal modulation circuit is used for outputting H-bridge control signals;
and the H-bridge control circuit is connected with the signal modulation circuit and is used for converting the H-bridge control signal into a driving signal and outputting the driving signal to the motor.
2. The stepless speed regulating controller of claim 1, further comprising a PWM generation circuit for generating a PWM signal with continuously adjustable duty cycle, the PWM generation circuit being connected to the signal modulation circuit for transmitting the PWM signal, the signal modulation circuit converting the zero crossing pulse signal and PWM signal into an H-bridge control signal of 16-18KHz with adjustable pulse width.
3. The stepless speed regulating controller according to claim 2, wherein the PWM generating circuit comprises a potentiometer R12, a triode Q6, and an operational amplifier comparator U4, the controller is connected with the operational amplifier comparator U4, the operational amplifier comparator U4 is connected with the b pole of the triode Q6, the e pole of the triode Q6 is grounded, and the c pole of the triode Q6 is connected with the signal modulating circuit.
4. The stepless speed regulating controller according to claim 2, wherein the H-bridge control circuit comprises an H-bridge driving circuit and an H-bridge alternating current voltage regulating circuit which are connected with each other, the H-bridge driving circuit is used for amplifying the H-bridge control signal and transmitting the H-bridge control signal to the H-bridge alternating current voltage regulating circuit, and the H-bridge alternating current voltage regulating circuit is used for outputting a driving signal of the motor according to the direct current pulsation signal of 100Hz and the H-bridge control signal.
5. The stepless speed regulating controller according to claim 4, wherein the signal modulation circuit comprises a resistor R3, a resistor R4, a resistor R6, a resistor R8, a diode D3 and a diode D4, different output pins of the controller are respectively connected through the resistor R3, the resistor R4, the resistor R6 and the resistor R8, the resistor R3, the resistor R4, the resistor R6 and the resistor R8 are respectively used for transmitting different control signals of the controller to the H-bridge control circuit, the output end of the PWM generation circuit is divided into two branches, one branch is connected to a connection node of the resistor R6 and the H-bridge control circuit through the diode D3, and the other branch is connected to a connection node of the resistor R3 and the H-bridge control circuit through the diode D4.
6. The stepless speed regulating controller according to claim 5, wherein the H-bridge driving circuit comprises a driving chip U2 and a driving chip U3, the H-bridge alternating current regulating circuit comprises MOSFET switching tubes Q1 to Q4, different output pins of the controller are respectively connected with the driving chip U2 and the driving chip U3, two time-division transmitted driving signals of the driving chip U2 are respectively transmitted to the motor through the MOSFET switching tubes Q1 and Q2, and two time-division transmitted driving signals of the driving chip U3 are respectively transmitted to the motor through the MOSFET switching tubes Q3 and Q4.
7. The stepless speed control device of claim 6, wherein: in one DC pulse period, the MOSFET switch tube Q1 and the MOSFET switch tube Q4 are conducted, and the MOSFET switch tube Q3 and the driving MOSFET switch tube Q2 are turned off; in another DC pulse period, the MOSFET switch transistors Q3 and Q2 are turned on, and the MOSFET switch transistors Q1 and Q4 are turned off.
8. The stepless speed control device of claim 7, wherein: in the state that the MOSFET switch tube Q1 and the MOSFET switch tube Q4 are conducted, the MOSFET switch tube Q4 is fully conducted and is used for transmitting a driving signal of a motor, and the MOSFET switch tube Q1 is conducted or disconnected according to the H-bridge control signal and is used for controlling the amplitude of a sine wave positive half-cycle driving signal of the motor; under the state that the MOSFET switch tube Q3 and the MOSFET switch tube Q2 are conducted, the MOSFET switch tube Q2 is fully conducted and is used for transmitting a driving signal of the motor, and the MOSFET switch tube Q3 is conducted or disconnected according to the H-bridge control signal and is used for controlling the amplitude of a sine wave negative half-cycle driving signal of the motor.
9. The stepless speed control device of claim 1, wherein: the rectifying circuit comprises a primary power supply filter circuit, a secondary power supply filter circuit and a rectifier bridge stack DG which are sequentially connected, wherein the primary power supply filter circuit comprises an inductor T1 and a capacitor C7 which are mutually connected in parallel, and the secondary power supply filter circuit comprises an inductor T2 and a capacitor C8 which are connected in parallel.
10. A range hood using the speed governor of any of claims 1 to 9, the range hood comprising: the device comprises a shell, a smoke inlet, a smoke outlet, a cavity arranged in the shell, a fan system arranged in the cavity and a stepless speed regulating controller, wherein a fan in the fan system is electrically connected with the stepless speed regulating controller, and the stepless speed regulating controller is arranged above the fan.
CN202210452395.3A 2022-04-27 2022-04-27 Stepless speed regulating controller and range hood using same Pending CN117013912A (en)

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Application Number Priority Date Filing Date Title
CN202210452395.3A CN117013912A (en) 2022-04-27 2022-04-27 Stepless speed regulating controller and range hood using same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210452395.3A CN117013912A (en) 2022-04-27 2022-04-27 Stepless speed regulating controller and range hood using same

Publications (1)

Publication Number Publication Date
CN117013912A true CN117013912A (en) 2023-11-07

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210452395.3A Pending CN117013912A (en) 2022-04-27 2022-04-27 Stepless speed regulating controller and range hood using same

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Country Link
CN (1) CN117013912A (en)

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