CN118030574A - Stepless speed regulation control method, circuit and equipment for fan - Google Patents
Stepless speed regulation control method, circuit and equipment for fan Download PDFInfo
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- CN118030574A CN118030574A CN202410145193.3A CN202410145193A CN118030574A CN 118030574 A CN118030574 A CN 118030574A CN 202410145193 A CN202410145193 A CN 202410145193A CN 118030574 A CN118030574 A CN 118030574A
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 137
- 238000001914 filtration Methods 0.000 claims abstract description 59
- 238000001514 detection method Methods 0.000 claims abstract description 55
- 239000003990 capacitor Substances 0.000 claims description 62
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 16
- 229910052710 silicon Inorganic materials 0.000 claims description 16
- 239000010703 silicon Substances 0.000 claims description 16
- 230000003111 delayed effect Effects 0.000 claims description 6
- 230000003750 conditioning effect Effects 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims 4
- 238000010586 diagram Methods 0.000 description 5
- 108010014173 Factor X Proteins 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- -1 10ms-8 ms=2ms Chemical compound 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003985 ceramic capacitor Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- 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
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Abstract
The application discloses a stepless speed regulation control method, a circuit and equipment of a fan, comprising a bidirectional controllable control module, a zero-crossing detection module, a logic control module and a filtering anti-surge module, wherein the method comprises the following steps: the logic control module obtains a falling edge pulse signal output by the zero crossing detection module, the logic control module obtains the current ambient temperature, the logic control module performs comparison operation according to the received falling edge pulse signal and combines the ambient temperature with a preset standard temperature, delay time is determined according to an operation result, a level signal is output to the logic control module after the delay time passes, the bidirectional controllable control module receives the level signal, and the filtering anti-surge module is turned on or off according to the level signal and passes through the logic control module to a power supply loop of the fan, so that the power supply voltage of the fan is controlled. The application has the advantages of reducing the cost of controlling the wind speed of the fan and realizing high-precision control.
Description
Technical Field
The present application relates to a fan control circuit, and more particularly, to a stepless speed control circuit, method and apparatus for a fan.
Background
At present, a fan is controlled by adopting fixed high, medium and low levels of wind, power interfaces for high, medium and low control are respectively connected to three positions of a transformer tap, so that three levels of power supply voltages with different magnitudes are controlled to control wind speed. Therefore, how to reduce the cost of controlling the wind speed of the fan and realize high-precision control is a technical problem to be solved urgently.
Disclosure of Invention
The application aims to reduce the cost of controlling the wind speed of a fan and realize high-precision control.
The application discloses a stepless speed regulation control method of a fan, which comprises the following steps:
the logic control module acquires a falling edge pulse signal output by the zero-crossing detection module;
The logic control module obtains the current ambient temperature, and performs comparison operation according to the preset standard temperature to generate a temperature difference;
the logic control module determines delay time t according to the received falling edge pulse signal and the temperature difference;
after the logic control module passes through the delay time t, a delay level signal is output to the bidirectional controllable control module;
And the bidirectional controllable control module determines the duty ratio of the controllable silicon according to the delay level signal, and turns on or off the filtering anti-surge module according to the duty ratio of the controllable silicon, and the filtering anti-surge module passes through the bidirectional controllable control module to a power supply loop of the fan.
By adopting the technical scheme, stepless speed regulation control of the fan is realized through a module formed by a few components, the control precision is improved, and the technical cost is reduced.
Optionally, a comparison operation formula according to which the delay time is determined is:
t＝tmax-ΔT×(tmax÷ΔTmax)
Wherein T max is half of the inverse of the falling edge pulse signal frequency, meaning the maximum delay time, Δt is the temperature difference between the ambient temperature and the set temperature, and Δt max is the theoretical maximum temperature difference between the ambient temperature and the set temperature.
By adopting the technical scheme, the fan is output to the fan in a delayed manner for a certain time according to the difference between the ambient temperature and the set temperature, so that the wind speed of the fan is controlled, and the accuracy of the fan is improved.
In another aspect of the application, a stepless speed regulation control circuit of a fan is disclosed, which specifically comprises:
the stepless speed regulation control circuit of the fan comprises a bidirectional controllable control module, a zero crossing detection module, a logic control module and a filtering anti-surge module, wherein:
The bidirectional controllable control module is used for receiving the level signal output by the logic control module, conducting the filtering anti-surge module and a power supply loop of the fan according to the level signal output by the logic control module, and comprises a level signal receiving end, a signal end and a fan power supply end, wherein the level signal receiving end is connected with the logic control module, the signal end is connected with the filtering anti-surge module, and the fan power supply end is connected with the first end of the fan;
The zero-crossing detection module is used for receiving an external alternating current signal and outputting a falling edge pulse signal to the logic control module, and comprises a live wire input end, a zero line input end and a pulse signal output end, wherein the live wire input end is connected with a live wire, the zero line input end is connected with a zero line, and the pulse signal output end is connected with the logic control module; the logic control module is used for receiving the falling edge pulse signal and outputting a level signal to the bidirectional controllable control module according to the falling edge pulse signal in a delayed manner, the logic control module comprises a pulse signal receiving end and a level signal output end, the pulse signal receiving end is connected with the pulse signal output end of the zero crossing detection module, and the level signal output end is connected with the level signal receiving end of the bidirectional controllable control module;
The filtering anti-surge module is used for receiving external alternating current signals, the external alternating current signals are subjected to filtering and anti-surge treatment by the filtering anti-surge module to provide driving voltage for the fan, the filtering anti-surge module comprises a live wire input end, a zero wire input end, a signal end and a fan power supply end, the live wire input end of the filtering anti-surge module is connected with a live wire, the zero wire input end of the filtering anti-surge module is connected with a zero wire, the signal end of the filtering anti-surge module is connected with the signal end of the bidirectional controllable control module, and the fan power supply end of the filtering anti-surge module is connected with the second end of the fan.
By adopting the technical scheme, stepless speed regulation control of the fan is realized through a few components, the control precision is improved, and the technical cost is reduced.
Optionally, the bidirectional controllable control module includes a bidirectional thyristor and a drive control unit, and the drive control unit includes a first resistor, a second resistor, a triode and a first bidirectional photocoupler, where:
one end of the first resistor is connected with an external direct current signal source, and the other end of the first resistor is connected with a port 1 of the first bidirectional photoelectric coupler;
one end of the second resistor is connected with the logic control module, the other end of the second resistor is connected with the base electrode of the triode, the collector electrode of the triode is connected with the port 2 of the first bidirectional photoelectric coupler, and the emitter electrode of the triode is grounded;
The port 3 of the first bidirectional photoelectric coupler is respectively connected with the control end of the bidirectional thyristor and the first signal end of the bidirectional thyristor, the port 4 of the first bidirectional photoelectric coupler is connected with the second signal end of the bidirectional thyristor, and the second signal end of the bidirectional thyristor is also connected with the first end of the fan.
By adopting the technical scheme, the bidirectional optocoupler is turned on after the logic control module level signal is received, so that the bidirectional thyristor is turned on to supply power for the fan.
Optionally, the bidirectional controllable control module further comprises a signal conditioning unit and a protection unit, the signal conditioning unit comprises a third resistor and a fourth resistor, the protection unit comprises a capacitor, wherein:
one end of the third resistor is connected with the port 4 of the first bidirectional photoelectric coupler, and the other end of the third resistor is connected with the second signal end of the bidirectional thyristor;
One end of the fourth resistor is connected with the port 3 of the first bidirectional photoelectric coupler, and the other end of the fourth resistor is connected with the first signal end of the bidirectional thyristor;
one end of the capacitor is connected with the first signal end of the bidirectional thyristor, and the other end of the capacitor is connected with the second signal end of the bidirectional thyristor.
By adopting the technical scheme, the resistance values of the third resistor and the fourth resistor can be adjusted to adjust the magnitude of the control signal of the silicon controlled rectifier, and the capacitor can absorb peak voltage instantaneously generated by the silicon controlled rectifier switch, so that the circuit is protected.
Optionally, the zero crossing detection module includes a fifth resistor, a sixth resistor, a seventh resistor, and a second bidirectional photocoupler, wherein:
One end of the fifth resistor is connected with the wire end, the other end of the fifth resistor is connected with the port 5 of the second bidirectional photoelectric coupler, one end of the sixth resistor is connected with the zero wire end, and the other end of the sixth resistor is connected with the port 6 of the second bidirectional photoelectric coupler;
the port 7 of the second bidirectional photoelectric coupler is connected with a ground electrode;
The port 8 of the second bidirectional photoelectric coupler is respectively connected with the pulse signal receiving end of the logic control module and one end of the seventh resistor, and the other end of the seventh resistor is connected with an external direct current signal source.
By adopting the technical scheme, a falling edge pulse signal is generated to the logic control module, and the frequency of the falling edge pulse signal module can control the maximum value of the output delay time of the logic control module.
Optionally, the logic control module includes singlechip and temperature detection unit, the singlechip includes drive end, ground connection end, temperature detection end, pulse signal receiving end and level signal output, wherein:
The temperature detection end of the singlechip is connected with the temperature detection unit, the temperature detection unit comprises a detection end and an acquisition end, the environment detection end is used for detecting the environment temperature, the acquisition is used for acquiring the set temperature, the temperature detection end is used for calculating the temperature difference between the environment temperature and the set temperature, and the temperature difference is output to the temperature detection end of the singlechip;
The driving end of the singlechip is used for receiving power supplied by an external direct current signal source, and the grounding end of the singlechip is connected with the ground electrode;
The pulse signal receiving end of the singlechip is used for receiving a falling edge pulse signal output by the port 4 of the second bidirectional photoelectric coupler; the level output end of the singlechip is used for outputting a level signal to the level signal receiving end of the bidirectional controllable control module in a delayed mode according to the falling edge pulse signal.
By adopting the technical scheme, the temperature difference delay of the comprehensive falling edge pulse signal, the ambient temperature and the set temperature outputs a level signal to the first switching tube of the bidirectional controllable control module, so that the first switching tube is controlled to be turned on or off, and the duty ratio is adjusted.
Optionally, the filtering anti-surge module includes a common mode filtering unit, the common mode filtering unit includes a common mode inductance, a first safety Y capacitor and a second safety Y capacitor, wherein:
The first end of the primary side of the common mode inductor is connected with the live wire end, and the first end of the secondary side is connected with the zero wire end;
One end of the first safety Y capacitor is connected with the second end of the primary side of the common-mode inductor, the other end of the first safety Y capacitor is connected with the first end of the second safety Y capacitor, and the second end of the second safety Y capacitor is respectively connected with the second end of the secondary side of the common-mode inductor and the second end of the fan;
And the junction of the first safety Y capacitor and the second safety Y capacitor is connected with a ground terminal.
By adopting the technical scheme, the common-mode interference path is dredged through the combination of the common-mode inductor and the safety Y capacitor, interference is prevented from being coupled to a load from a source, and the common-mode interference is filtered.
Optionally, the anti-surge module of filtering still includes piezoresistor and differential mode filter unit, differential mode filter unit includes first safety rule X electric capacity and second safety rule X electric capacity, wherein:
One end of the piezoresistor is connected with the connection part of the primary side first end and the live wire end of the common mode inductor, and the other end of the piezoresistor is connected with the connection part of the secondary side first end and the zero line end of the common mode inductor;
one end of the first safety X capacitor is connected with the primary side first end of the common-mode inductor, and the other end of the first safety X capacitor is connected with the secondary side first end of the common-mode inductor;
One end of the second safety X capacitor is respectively connected with the primary side second end of the common mode inductor and one end of the piezoresistor, and the other end of the second safety X capacitor is respectively connected with the secondary side second end of the common mode inductor and the other end of the piezoresistor.
By adopting the technical scheme, the piezoresistor has the characteristic of sharply reducing the resistance value along with the voltage increase, can inhibit surge current, and the safety X capacitor is used in parallel with the piezoresistor, can bear overvoltage impact and can filter the influence of differential mode interference on the electric signal.
In summary, the present application includes at least one of the following beneficial effects:
And 1. The MCU outputs a level signal after the delay time t, and the level signal can supply a gate electrode driving signal to the controllable silicon through the first bidirectional photoelectric coupler so as to control the conduction of the controllable silicon, thereby supplying power to the fan. The wind speed of the fan is changed according to the change of the delay time t, and the precision of the fan can be improved by adjusting the delay time t, so that stepless speed regulation is realized.
2. The MCU can detect the ambient temperature, compare with the set temperature to obtain a temperature difference, calculate the delay time t according to the temperature difference, thereby adjusting the delay time according to the temperature difference between the ambient temperature and the set temperature and realizing automatic speed regulation.
3. The filtering anti-surge module can inhibit surge current on one hand, so that damage to a circuit caused by the surge current is prevented, and on the other hand, the influence of common mode interference and differential mode interference on signals is filtered through the combined action of LC filtering components in the module, so that the power supply quality of a load can be improved, and the pollution to a power grid is reduced.
Drawings
FIG. 1 is a schematic circuit diagram of one embodiment of a prior art blower;
FIG. 2 is a flow chart of one embodiment of a stepless speed control method of the blower of the present application;
FIG. 3 is a block diagram of one embodiment of a stepless speed control circuit for a blower of the present application;
Fig. 4 is a circuit schematic of one embodiment of a stepless speed control circuit for a blower of the present application.
Detailed Description
The present application will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic circuit diagram of one embodiment of a prior art blower.
Specifically, the existing fan only has fixed high, medium and low three-gear wind control, and the wind speed gear of the fan is sequentially and circularly switched by one or more short presses of a key KY1, so that the existing fan has the inconveniences of narrow and rough control range, poor comfortableness and the like.
Referring to fig. 2, fig. 2 is a flow chart of one embodiment of a stepless speed control method of the fan of the present application, the method comprising the steps of:
In step S1, the logic control module 3 acquires a falling edge pulse signal output from the zero-crossing detection module 2.
Specifically, the zero-crossing detection module 2 includes a first bidirectional photocoupler, where the first bidirectional photocoupler is connected to an external ac signal source, and the ac signal source has zero crossings once in a positive half cycle and a negative half cycle, so that the zero-crossing detection module 2 generates a falling edge pulse signal and outputs the falling edge pulse signal to the logic control module 3.
In step S2, the logic control module 3 obtains the current ambient temperature, and performs a comparison operation according to a preset standard temperature to generate a temperature difference.
Specifically, a temperature comparator is arranged in the logic control module 3, and the temperature comparator can detect the ambient temperature and perform difference operation according to the ambient temperature and a preset temperature value in the logic control module 3 to generate a current temperature difference.
In step S3, the logic control module 3 determines the delay time t according to the received falling edge pulse signal and in combination with the temperature difference.
Specifically, the frequency of the falling edge pulse signal can determine the maximum value of the delay time, assuming that the pulse signal having a frequency of 50hz and a frequency of 50hz has 100 half waves within 1s, the time of each half wave is 1/100=0.01s=10 ms, i.e., the maximum value of the delay time is 10ms. The comparison operation between the ambient temperature and the preset standard temperature adopts the following formula:
t＝tmax-ΔT×(tmax÷ΔTmax)
More specifically, T max is half of the inverse of the falling edge pulse signal frequency, meaning a maximum delay time, Δt is a temperature difference between an ambient temperature and a set temperature, Δt max is a theoretical maximum temperature difference between the ambient temperature and the set temperature, taking the pulse signal frequency as an example of 50Hz, at which time the pulse signal has 100 half waves, the maximum delay time is 10ms, assuming that the current ambient temperature is 30 ℃, the set temperature is 25 ℃, and the temperature difference Δt between the two is 5 ℃, and the delay time t= [10-5 x (10/50) ] ms=9 ms.
In step S4, the logic control module 3 outputs a delay level signal to the bidirectional controllable control module 1 after the delay time t.
In step S5, the bidirectional controllable control module 1 determines a silicon controlled rectifier duty ratio according to the delay level signal, and turns on or off a filter anti-surge module 4 according to the silicon controlled rectifier duty ratio, and the power supply loop from the bidirectional controllable control module 1 to the fan.
Specifically, the bidirectional controllable control module 1 contains a bidirectional controllable silicon, the on-time duty ratio of the controllable silicon can control the wind speed of the fan, wherein the larger the delay time is, the smaller the on-time duty ratio of the controllable silicon is, the lower the power supply voltage to the fan is, and the lower the wind speed of the fan is, and vice versa.
More specifically, assuming that the current ambient temperature is 30 ℃, the set temperature is 20 ℃, and the temperature difference Δt between the two is 10 ℃, the delay time is: t=10-10× (10++50) ms=8 ms, i.e. the on time of the thyristor t1=t max -t, i.e. 10ms-8 ms=2 ms, the supply voltage u1=t1++ max ×u of the control fan (M1), where U is the mains rated voltage, typically 220V, i.e. the supply voltage U1 of the control fan (M1) is 0.2U, the wind speed v1=t1++t max ×v, where V is the maximum wind speed of the fan (M1), i.e. the wind speed is 0.2V.
Referring to fig. 3, fig. 3 is a block diagram of an embodiment of a stepless speed regulation control circuit of a fan according to the present application, which includes a bidirectional controllable control block 1, a zero crossing detection block 2, a logic control block 3, and a filter anti-surge block 4, wherein:
the bidirectional controllable control module 1 is used for receiving a level signal output by the logic control module 3, conducting a power supply loop of the filtering anti-surge module 4 and the fan according to the level signal output by the logic control module 3, the bidirectional controllable control module 1 comprises a level signal receiving end, a signal end and a fan power supply end, the level signal receiving end is connected with the logic control module 3, the signal end is connected with the filtering anti-surge module 4, and the fan power supply end is connected with a first end of the fan.
With respect to the bi-directional controllable control module: the bidirectional controllable control module comprises two voltage dividing resistors, two adjusting resistors, an MOS tube, a bidirectional photoelectric coupler, a bidirectional thyristor and a ceramic chip capacitor, wherein the voltage dividing resistors are used for dividing a voltage protection circuit, the adjusting resistors are used for adjusting the size of a bidirectional thyristor control signal, the MOS tube can receive a level signal output by the logic control circuit 3 so as to realize the connection or disconnection of the MOS tube, the level signal can be a high level signal, the two ends of a fan can provide driving voltage after the bidirectional thyristor is connected, and the ceramic chip capacitor can absorb peak voltage generated by the bidirectional thyristor in the switching moment so as to protect the circuit.
The zero-crossing detection module 2 is used for receiving external alternating current signals and outputting falling edge pulse signals to the logic control module 3, the zero-crossing detection module 2 comprises a live wire input end, a zero line input end and a pulse signal output end, the live wire input end is connected with a live wire, the zero line input end is connected with a zero line, and the pulse signal output end is connected with the logic control module 3.
Regarding the zero-crossing detection module: the zero-crossing detection module comprises two current-limiting resistors, a bidirectional photoelectric coupler and a pull-up resistor, when the first bidirectional photoelectric coupler is not conducted, the detection signal is pulled up to a high level, when the first bidirectional photoelectric coupler is conducted, an alternating current input signal is input, zero crossing is carried out once in a positive half period and a negative half period of alternating current respectively, and therefore a falling edge pulse signal is generated.
The logic control module 3 is configured to receive the falling edge pulse signal, and delay and output a level signal to the bidirectional controllable control module 1 according to the falling edge pulse signal, a temperature difference between an ambient temperature and a set temperature, where the logic control module 3 includes a pulse signal receiving end, a temperature difference detecting end, and a level signal output end, where the pulse signal receiving end is connected to the pulse signal output end of the zero crossing detecting module 2, and the level signal output end is the level signal receiving end of the bidirectional controllable control module 1.
Regarding the logic control module: the logic control module comprises a singlechip and a temperature comparator, the singlechip can receive the falling edge pulse signal output by the zero-crossing detection module, the temperature comparator can detect the current ambient temperature and compare the current ambient temperature with the set temperature of the temperature comparator to obtain a temperature difference, and then a delay time t is obtained according to the frequency of the falling edge pulse signal, the ambient temperature and the temperature difference of the set temperature, and the singlechip outputs a level signal after passing through the delay time t.
The filtering anti-surge module 4 is used for receiving external alternating current signals, the external alternating current signals are subjected to filtering and anti-surge treatment by the filtering anti-surge module 4 to provide driving voltage for a fan, the filtering anti-surge module 4 comprises a live wire input end, a zero wire input end, a signal end and a fan power supply end, the live wire input end of the filtering anti-surge module 4 is connected with a live wire, the zero wire input end of the filtering anti-surge module 4 is connected with a zero wire, the signal end of the filtering anti-surge module 4 is connected with the signal end of the bidirectional controllable control module 1, and the fan power supply end of the filtering anti-surge module 4 is connected with the second end of the fan.
Regarding the filtering anti-surge module: the filter anti-surge module comprises a piezoresistor, a set of safety X capacitors, a set of safety Y capacitors and a common mode inductor, wherein the piezoresistor can inhibit surge current so as to protect a circuit, the safety X capacitors can be used for combining and filtering differential mode interference (the differential mode interference is transmitted between two wires and belongs to symmetrical interference and is defined as an unwanted potential difference between any two current carrying conductors), and the safety Y capacitors and the common mode inductor can be used for combining and filtering common mode interference (the common mode interference is transmitted between the wires and the ground and belongs to asymmetrical interference and is defined as an unwanted potential difference between any current carrying conductor and the reference ground). The voltage-dependent resistor can sharply reduce the internal resistance value when the voltage in the circuit exceeds a critical value and increase the current flowing through the voltage-dependent resistor, so that the circuit is prevented from being damaged by surge current.
Referring to fig. 4, fig. 4 is a schematic circuit diagram of an embodiment of a stepless speed regulation control circuit of a fan according to the present application, where the circuit includes a bidirectional controllable control module 1, a zero-crossing detection module 2, a logic control module 3, and a filtering anti-surge module 4, and specifically includes:
The bidirectional controllable control module 1 comprises a bidirectional controllable silicon Q2 and a drive control unit, wherein the drive control unit comprises a first resistor R1, a second resistor R2, a triode Q1 and a first bidirectional photocoupler U1, and the bidirectional controllable silicon Q2 comprises:
One end of the first resistor R1 is connected with an external direct current signal source, and the other end of the first resistor R1 is connected with a port 1 of the first bidirectional photoelectric coupler U1;
One end of the second resistor R2 is connected with a level signal output end Win Control of the logic Control module 3, the other end of the second resistor R2 is connected with a base electrode of the triode Q1, a collector electrode of the triode Q1 is connected with a port 2 of the first bidirectional photoelectric coupler U1, and an emitter electrode of the triode Q1 is grounded.
Specifically, the high level signal output by the level signal output terminal Win Control of the logic Control module 3 is output to the base of the triode Q1 through the second resistor R2, so that an external direct current signal source is grounded through the first resistor R1, the first bidirectional photocoupler U1 and the body diode of the triode Q1 to trigger the photodiode.
The port 3 of the first bidirectional photocoupler U1 is connected with the control end of the bidirectional thyristor Q2 and the first signal end of the bidirectional thyristor Q2 respectively, the port 4 of the first bidirectional photocoupler U1 is connected with the second signal end of the bidirectional thyristor Q2, and the second signal end of the bidirectional thyristor Q2 is also connected with the first end of the fan M1.
Specifically, when the photodiode U1 is not turned on, the zero crossing circuit of the first bidirectional photocoupler U1 is not turned on, so that power is not supplied to the control end of the bidirectional thyristor Q2, and the bidirectional thyristor Q2 is not turned on, so that power supply voltages are not provided at two ends of the fan M1, and therefore the fan M1 is not turned on; when the photodiode U1 is conducted, the zero crossing circuit is conducted and supplies power to the control end of the bidirectional thyristor Q2, so that the bidirectional thyristor Q2 is conducted, a loop passing through two ends of the fan M1 can be formed after the bidirectional thyristor Q2 is conducted, voltage is provided for two ends of the fan M1, and the fan is driven to start.
More specifically, the rotation speed of the fan M1 is controlled by the delay time t of the level signal output by the logic control module 3, the longer the delay time t is, the shorter the on time of the bidirectional thyristor Q2 is, the power supply voltage of the fan M1 is controlled, and the larger the power supply voltage of the fan M1 is, the larger the wind speed of the fan M1 is. For example, the pulse signal frequency is 50Hz, the current ambient temperature is 30 ℃, the set temperature is 20 ℃, the temperature difference Δt between the two is 10 ℃, and in this case, the delay time is:
t＝10-10×(10÷50)ms＝8ms
The on time t1=t max -t of the controllable silicon, namely 10ms-8 ms=2ms, the power supply voltage u1=t1++t max xu of the control fan M1, wherein U is the rated voltage of the mains supply, usually 220V, namely the power supply voltage U1 of the control fan M1 is 0.2U, the wind speed v1=t1++t max ×v, wherein V is the maximum wind speed of the fan M1, namely the wind speed is 0.2V.
Further, the bidirectional controllable control module 1 further comprises a signal conditioning unit comprising a third resistor R3 and a fourth resistor R4 and a protection unit comprising a capacitor C1, wherein:
one end of the third resistor R3 is connected with the port 4 of the first bidirectional photocoupler U1, and the other end of the third resistor R3 is connected with the second signal end of the bidirectional thyristor Q2;
one end of the fourth resistor R4 is connected with the port 3 of the first bidirectional photocoupler U1, and the other end of the fourth resistor R4 is connected with the first signal end of the bidirectional thyristor Q2;
One end of the capacitor C1 is connected with the first signal end of the bidirectional thyristor Q2, and the other end of the capacitor C is connected with the second signal end of the bidirectional thyristor Q2.
Specifically, by adjusting the resistance values of the third resistor R3 and the fourth resistor R4, the magnitude of the ac signal at two ends of the triac Q2 can be adjusted, and the larger the resistance values of R3 and R4, the smaller the ac signal at two ends of the triac Q2, in this embodiment, the capacitor C1 is a high-voltage ceramic capacitor, which is used to absorb the spike voltage generated by the triac Q2 at the moment of switching, so as to protect the triac from being damaged by high-voltage breakdown.
Further, the zero crossing detection module 2 comprises a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and a second bidirectional optocoupler U2, wherein:
One end of the fifth resistor R5 is connected with the fire wire end L, the other end of the fifth resistor R5 is connected with the port 5 of the second bidirectional photoelectric coupler (U2), one end of the sixth resistor R6 is connected with the zero wire end N, and the other end of the sixth resistor R6 is connected with the port 6 of the second bidirectional photoelectric coupler U2;
the port 7 of the second bidirectional photoelectric coupler U2 is connected with a ground electrode;
The port 8 of the second bidirectional photocoupler U2 is connected to the pulse signal receiving end of the logic control module 3 and one end of the seventh resistor R7, and the other end of the seventh resistor R7 is connected to an external dc signal source.
Specifically, the external ac signal source is output to the port 5 and the port 6 of the second bidirectional photocoupler U2 through the fifth resistor R5 and the sixth resistor R6, respectively, so that the bidirectional diode in the second bidirectional photocoupler U2 is turned on, and when the bidirectional diode in the second bidirectional photocoupler U2 is turned on, the level signal output by the external dc signal source is output to the ground through the seventh resistor R7 and the second bidirectional photocoupler U2, and in this case, the Zero crossing detection signal Zero test outputs a low level; when the bidirectional diode in the second bidirectional photocoupler U2 is not turned on, the level signal output by the external dc signal source outputs the Zero-crossing detection signal Zero test through the seventh resistor R7, in which case the Zero-crossing detection signal Zero test is pulled up to VDD as a high level, and Zero-crossing occurs once in the positive half cycle and the negative half cycle of the ac power, so that the Zero test generates a falling edge pulse signal.
Further, the logic control module 3 comprises a single chip microcomputer and a temperature detection unit, wherein the single chip microcomputer MCU comprises a driving end, a grounding end, a temperature detection end, a pulse signal receiving end and a level signal output end, wherein:
The temperature detection end of the singlechip is connected with the temperature detection unit, the temperature detection unit comprises a detection end and an acquisition end, the environment detection end is used for detecting the environment temperature, the acquisition is used for acquiring the set temperature, the temperature detection end is used for calculating the temperature difference between the environment temperature and the set temperature, and the temperature difference is output to the temperature detection end of the singlechip;
The driving end of the singlechip is used for receiving power supplied by an external direct current signal source, and the grounding end of the singlechip is connected with the ground electrode;
the pulse signal receiving end of the singlechip is used for receiving a falling edge pulse signal output by the port 4 of the second bidirectional photoelectric coupler; the level output end of the singlechip is used for outputting a level signal to the level signal receiving end of the bidirectional controllable control module 1 in a delayed mode according to the falling edge pulse signal.
Specifically, the comparison operation formula according to which the delay time t is determined is:
t＝tmax-ΔT×(tmax÷ΔTmax)
Wherein T max is half of the inverse of the falling edge pulse signal frequency, meaning the maximum delay time, Δt is the temperature difference between the ambient temperature and the set temperature, and Δt max is the theoretical maximum temperature difference between the ambient temperature and the set temperature.
Further, the filtering anti-surge module 4 includes a common mode filtering unit, the common mode filtering unit includes a common mode inductance L1), a first safety rule Y capacitor Y1 and a second safety rule Y capacitor Y2, wherein:
One end of the first safety rule Y capacitor Y1 is connected with one end of the first safety rule X capacitor CX1, the other end of the first safety rule Y capacitor Y1 is connected with the first end of the second safety rule Y capacitor Y2, and the second end of the second safety rule Y capacitor Y2 is respectively connected with the other end of the first safety rule X capacitor CX1 and the second end of the fan M1;
and a ground terminal PE is also connected between the other end of the first safety Y capacitor Y1 and one end of the second safety Y capacitor Y2.
Specifically, the common-mode inductor generally has two coils wound on the same core, the number of turns and the phase are the same, and the winding directions are opposite, when normal current in the circuit flows through the common-mode inductor, the currents generate opposite magnetic fields in the inductor coils wound in the same phase to cancel each other, so that common-mode interference is eliminated.
In particular, the safety capacitor connected between "live-ground" or "neutral-ground" is typically a safety Y-capacitance, thereby clearing the path of common mode interference from coupling the source to the load, such that common mode interference is filtered from source to ground.
Further, the filtering anti-surge module 4 further includes a piezoresistor RV1 and a differential mode filtering unit, where the differential mode filtering unit includes a first safety factor X capacitor CX1 and a second safety factor X capacitor CX2, where:
One end of the piezoresistor RV1 is connected with the connection part of the primary side first end and the live wire end of the common mode inductor L1, and the other end is connected with the connection part of the secondary side first end and the zero line end of the common mode inductor L1.
Specifically, the varistor RV1 has a characteristic of sharply decreasing the resistance value as the voltage increases, and is connected in parallel between the live wire and the neutral wire, so that the surge current can be suppressed, and the circuit can be protected.
One end of the first safety X capacitor CX1 is connected with the primary side first end of the common mode inductor L1, and the other end of the first safety X capacitor CX1 is connected with the secondary side first end of the common mode inductor L1;
One end of the second safety X capacitor CX2 is respectively connected with the primary side second end of the common mode inductor L1 and one end of the piezoresistor RV1, and the other end of the second safety X capacitor CX2 is respectively connected with the secondary side second end of the common mode inductor L1 and the other end of the piezoresistor RV 1.
Specifically, the safety capacitor connected between the "live line and the zero line" is usually a safety Y capacitor, which is suitable for high frequency, direct current, alternating current and coupling, and can withstand overvoltage impact in a bridge pulse circuit, and is generally used in parallel with a resistor, and in this embodiment, is used in parallel with the piezoresistor RV 1.
The embodiments of the present application are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in this way, therefore: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (10)
1. A stepless speed regulation control method for a fan, which is characterized by comprising the following steps:
the logic control module acquires a falling edge pulse signal output by the zero-crossing detection module;
The logic control module obtains the current ambient temperature, and performs comparison operation according to the preset standard temperature to generate a temperature difference;
the logic control module determines delay time t according to the received falling edge pulse signal and the temperature difference;
after the logic control module passes through the delay time t, a delay level signal is output to the bidirectional controllable control module;
And the bidirectional controllable control module determines the duty ratio of the controllable silicon according to the delay level signal, and turns on or off the filtering anti-surge module according to the duty ratio of the controllable silicon, and the filtering anti-surge module passes through the bidirectional controllable control module to a power supply loop of the fan.
2. The stepless speed regulating control method of a fan according to claim 1, wherein the logic control module combines the temperature difference according to the received falling edge pulse signal to determine a comparison operation formula according to which the delay time t is determined as follows:
t＝tmax-ΔT×(tmax÷ΔTmax)
Wherein T max is half of the inverse of the falling edge pulse signal frequency, meaning the maximum delay time, Δt is the temperature difference between the ambient temperature and the set temperature, and Δt max is the theoretical maximum temperature difference between the ambient temperature and the set temperature.
3. A stepless speed regulation control circuit of a fan is characterized in that: the device comprises a bidirectional controllable control module, a zero crossing detection module, a logic control module and a filtering anti-surge module;
The bidirectional controllable control module is used for receiving the level signal output by the logic control module, conducting the filtering anti-surge module and a power supply loop of the fan according to the level signal output by the logic control module, and comprises a level signal receiving end, a signal end and a fan power supply end, wherein the level signal receiving end is connected with the logic control module, the signal end is connected with the filtering anti-surge module, and the fan power supply end is connected with the first end of the fan;
The zero-crossing detection module is used for receiving an external alternating current signal and outputting a falling edge pulse signal to the logic control module, and comprises a live wire input end, a zero line input end and a pulse signal output end, wherein the live wire input end is connected with a live wire, the zero line input end is connected with a zero line, and the pulse signal output end is connected with the logic control module; the logic control module is used for receiving the falling edge pulse signal and outputting a level signal to the bidirectional controllable control module according to the falling edge pulse signal, the temperature difference between the ambient temperature and the set temperature in a delayed mode, the logic control module comprises a pulse signal receiving end, a temperature difference detection end and a level signal output end, the pulse signal receiving end is connected with the pulse signal output end of the zero crossing detection module, and the level signal output end is connected with the level signal receiving end of the bidirectional controllable control module;
The filtering anti-surge module is used for receiving external alternating current signals, the external alternating current signals are subjected to filtering and anti-surge treatment by the filtering anti-surge module to provide driving voltage for the fan, the filtering anti-surge module comprises a live wire input end, a zero wire input end, a signal end and a fan power supply end, the live wire input end of the filtering anti-surge module is connected with a live wire, the zero wire input end of the filtering anti-surge module is connected with a zero wire, the signal end of the filtering anti-surge module is connected with the signal end of the bidirectional controllable control module, and the fan power supply end of the filtering anti-surge module is connected with the second end of the fan.
4. The stepless speed regulating control circuit of claim 3, wherein the bidirectional controllable control module comprises a bidirectional thyristor and a drive control unit, the drive control unit comprising a first resistor, a second resistor, a triode, and a first bidirectional photocoupler, wherein:
One end of the first resistor is connected with an external direct current signal source, and the other end of the first resistor is connected with a port (1) of the first bidirectional photoelectric coupler;
One end of the second resistor is connected with the logic control module, the other end of the second resistor is connected with the base electrode of the triode, the collector electrode of the triode is connected with the port (2) of the first bidirectional photoelectric coupler, and the emitter electrode of the triode is grounded;
The port (3) of the first bidirectional photoelectric coupler is respectively connected with the control end of the bidirectional thyristor and the first signal end of the bidirectional thyristor, the port (4) of the first bidirectional photoelectric coupler is connected with the second signal end of the bidirectional thyristor, and the second signal end of the bidirectional thyristor is also connected with the first end of the fan.
5. The stepless speed regulating control circuit of blower of claim 4, wherein the bidirectional controllable control module further comprises a signal conditioning unit comprising a third resistor and a fourth resistor and a protection unit comprising a capacitor, wherein:
One end of the third resistor is connected with the port (4) of the first bidirectional photoelectric coupler, and the other end of the third resistor is connected with the second signal end of the bidirectional thyristor;
one end of the fourth resistor is connected with the port (3) of the first bidirectional photoelectric coupler, and the other end of the fourth resistor is connected with the first signal end of the bidirectional thyristor;
one end of the capacitor is connected with the first signal end of the bidirectional thyristor, and the other end of the capacitor is connected with the second signal end of the bidirectional thyristor.
6. The stepless speed control circuit of claim 3, wherein the zero crossing detection module comprises a fifth resistor, a sixth resistor, a seventh resistor, and a second bidirectional photocoupler, wherein:
One end of the fifth resistor is connected with the wire end, the other end of the fifth resistor is connected with the port (5) of the second bidirectional photoelectric coupler, one end of the sixth resistor is connected with the wire end, and the other end of the sixth resistor is connected with the port (6) of the second bidirectional photoelectric coupler;
a port (7) of the second bidirectional photoelectric coupler is connected with a ground electrode;
And a port (8) of the second bidirectional photoelectric coupler is respectively connected with a pulse signal receiving end of the logic control module and one end of the seventh resistor, and the other end of the seventh resistor is connected with an external direct current signal source.
7. The stepless speed regulating control circuit of the fan according to claim 6, wherein the logic control module comprises a single chip microcomputer and a temperature detection unit, the single chip microcomputer comprises a driving end, a grounding end, a temperature detection end, a pulse signal receiving end and a level signal output end, wherein:
The temperature detection end of the singlechip is connected with the temperature detection unit, the temperature detection unit comprises a detection end and an acquisition end, the environment detection end is used for detecting the environment temperature, the acquisition is used for acquiring the set temperature, the temperature detection end is used for calculating the temperature difference between the environment temperature and the set temperature, and the temperature difference is output to the temperature detection end of the singlechip;
The driving end of the singlechip is used for receiving power supplied by an external direct current signal source, and the grounding end of the singlechip is connected with the ground electrode;
The pulse signal receiving end of the singlechip is used for receiving a falling edge pulse signal output by a port (4) of the second bidirectional photoelectric coupler;
The level output end of the singlechip is used for outputting a level signal to the level signal receiving end of the bidirectional controllable control module in a delayed mode according to the falling edge pulse signal.
8. The stepless speed regulation control circuit of claim 4, wherein the filtering anti-surge module comprises a common mode filtering unit comprising a common mode inductance, a first safety Y capacitance and a second safety Y capacitance, wherein:
The first end of the primary side of the common mode inductor is connected with the live wire end, and the first end of the secondary side is connected with the zero wire end;
One end of the first safety Y capacitor is connected with the second end of the primary side of the common-mode inductor, the other end of the first safety Y capacitor is connected with the first end of the second safety Y capacitor, and the second end of the second safety Y capacitor is respectively connected with the second end of the secondary side of the common-mode inductor and the second end of the fan;
And the junction of the first safety Y capacitor and the second safety Y capacitor is connected with a ground terminal.
9. The stepless speed regulation control circuit of claim 8, wherein the filtering anti-surge module further comprises a piezoresistor and a differential mode filtering unit, the differential mode filtering unit comprising a first safety X capacitor and a second safety X capacitor, wherein:
One end of the piezoresistor is connected with the connection part of the primary side first end and the live wire end of the common mode inductor, and the other end of the piezoresistor is connected with the connection part of the secondary side first end and the zero line end of the common mode inductor;
one end of the first safety X capacitor is connected with the primary side first end of the common-mode inductor, and the other end of the first safety X capacitor is connected with the secondary side first end of the common-mode inductor;
One end of the second safety X capacitor is respectively connected with the primary side second end of the common mode inductor and one end of the piezoresistor, and the other end of the second safety X capacitor is respectively connected with the secondary side second end of the common mode inductor and the other end of the piezoresistor.
10. An apparatus comprising a circuit configuration capable of performing the stepless speed control method of a wind turbine as claimed in any one of claims 1-2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410145193.3A CN118030574A (en) | 2024-02-01 | 2024-02-01 | Stepless speed regulation control method, circuit and equipment for fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410145193.3A CN118030574A (en) | 2024-02-01 | 2024-02-01 | Stepless speed regulation control method, circuit and equipment for fan |
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| CN118030574A true CN118030574A (en) | 2024-05-14 |
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| CN202410145193.3A Pending CN118030574A (en) | 2024-02-01 | 2024-02-01 | Stepless speed regulation control method, circuit and equipment for fan |
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| CN (1) | CN118030574A (en) |
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- 2024-02-01 CN CN202410145193.3A patent/CN118030574A/en active Pending
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