CN106444890B - Power control circuit based on zero-crossing detection, power control method and temperature control switch state detection method - Google Patents
Power control circuit based on zero-crossing detection, power control method and temperature control switch state detection method Download PDFInfo
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- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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Abstract
The invention relates to a power control circuit based on zero-crossing detection, a power control method and a temperature control switch state detection method, wherein the power control circuit comprises an MCU (microprogrammed control unit) and a heater, and the power control circuit further comprises: the temperature control switch is respectively connected with the live wire and the heater, is turned off when the temperature is higher than a first preset temperature and is turned on when the temperature is lower than a second preset temperature; the power switch is respectively connected with the MCU, the heater and the zero line; the zero-crossing detection circuit is respectively connected with a connecting node of the heater and the temperature control switch and the MCU, is used for generating a level turnover signal when the input voltage crosses a zero point when the temperature control switch is switched on, and is also used for outputting a low level signal when the temperature control switch is switched off; and the MCU is used for controlling the power switch to be switched on or switched off according to the level overturning times of the level overturning signal. The power control circuit, the power control method and the temperature control switch state detection method can accurately control the average heating power of the heater, reduce the connection interference and improve the safety of the power control circuit.
Description
Technical field
The present invention relates to electronic technology fields, more particularly to a kind of power control circuit based on zero passage detection, power
Control method and temperature detect switch (TDS) condition detection method.
Background technique
With the development of electronic technology, the electric appliance type applied in people's life is more and more, the control of various electric appliances
Also increasingly intelligent.Such as the heating electrical appliances such as electric cooker, electromagnetic oven, electric kettle, warm-air drier need to control heating temperature
The working condition of heater is controlled.
In the prior art, temperature detect switch (TDS) is generallyd use to control heating temperature, i.e., when temperature is more than certain value, temperature control is opened
Shutdown is opened, and heater stops working, and when temperature is reduced to certain value, temperature detect switch (TDS) conducting, heater is begun to warm up.This temperature
Degree control mode can only be unable to accurately control the heating power of heater simply according to the working condition of temperature control heater,
And in switch connection moment, the interference that circuit is subject to is larger.In addition, the connecting and disconnecting state of temperature detect switch (TDS) does not also obtain
Real-time detection monitoring, can not sound an alarm when temperature detect switch (TDS) disconnects.
Summary of the invention
Based on this, it is necessary to be directed to the prior art, provide a kind of power control circuit based on zero passage detection, power control
Method and temperature detect switch (TDS) condition detection method can accurately control the heating power of heater, reduce interference when circuit is connected, together
When can accurately detect turn-off time of temperature detect switch (TDS).
The invention discloses a kind of power control circuits based on zero passage detection comprising micro-control unit
((Microcontroller Unit, MCU) and heater, further includes:
Temperature detect switch (TDS), is separately connected firewire and heater, and the temperature detect switch (TDS) is used to be higher than the first preset temperature in temperature
When turn off, be connected when temperature is lower than the second preset temperature, wherein first preset temperature is greater than or equal to the second default temperature
Degree；
Power switch is separately connected the MCU, the heater and zero curve；
Zero cross detection circuit, input terminal are separately connected the heater and temperature detect switch (TDS), described in output end connection
MCU, the zero cross detection circuit are used in temperature detect switch (TDS) conducting, and level overturning letter is generated in input voltage zero crossing
Number, it is also used to export low level signal when the temperature detect switch (TDS) disconnects；
The MCU, for according to the level of the level energizing signal overturn number control power switch conducting or
Shutdown.
Wherein, the MCU includes logging modle and control module,
The logging modle, in power switch conducting, the first level of record overturns number；
The control module, for controlling the power switch and closing when level overturning number reaches the first frequency threshold value
It is disconnected；
The logging modle is also used to when the power switch turns off, and record second electrical level overturns number；
The control module is also used to control the power when second electrical level overturns number and reaches the second frequency threshold value
Switch conduction.
Wherein, the MCU is also used to:
When the duration that level energizing signal is continuously not detected is greater than preset duration threshold value, controls the power switch and close
It is disconnected.
Wherein, the zero cross detection circuit, comprising: resistance R1, resistance R2, resistance R3, resistance R4, diode D1, three poles
Pipe Q1, capacitor C1 and capacitor C2, in which:
The base stage of the triode Q1 connects the connection section of the heater Yu the temperature detect switch (TDS) by the resistance R1
Point, the collector of the triode Q1 are separately connected the first end of resistance R3 and the first end of resistance R4, the triode Q1's
Emitter is for being grounded；
The second end of the resistance R3 is for accessing VCC voltage, and the second end of the resistance R4 is as the zero passage detection
The output end of circuit connects the MCU；
The capacitor C2 is separately connected the second end of the resistance R3 and the second end of the resistance R4；
The anode of the diode D1 connects the base stage of the triode Q1, the cathode ground connection of the diode D1；
The resistance R2 and the capacitor C1 are in parallel with the diode D1 respectively.
Wherein, the power control circuit further includes thermal cut-off, the thermal cut-off be connected to the power switch and
Between the zero curve.
Wherein, the power control circuit further includes alarm, and the alarm connects the MCU；
The MCU is also used to the driving when the duration that level energizing signal is continuously not detected is greater than preset duration threshold value
The alarm generates alarm signal.
Wherein, the power switch is thyristor, and the control electrode of the thyristor connects the MCU.
The invention also discloses a kind of Poewr control method, the Poewr control method is applied to the function based on zero passage detection
Rate control circuit, the power control circuit include that zero cross detection circuit, heater and the power connecting with the heater are opened
It closes, the Poewr control method includes:
Judge whether temperature is lower than the second preset temperature；
If being judged as YES, level energizing signal is generated in input voltage zero crossing；
Number, which is overturn, according to the level of the level energizing signal controls the power switch on or off.
Wherein, described that number control power switch on or off, packet are overturn according to the level of the level energizing signal
It includes:
In power switch conducting, the first level of record overturns number；
When level overturning number reaches the first frequency threshold value, the power switch shutdown is controlled；
In power switch shutdown, record second electrical level overturns number；
When second electrical level overturning number reaches the second frequency threshold value, the power switch conducting is controlled.
Wherein, the Poewr control method further include:
If level energizing signal is not detected within a preset time, alarm signal is generated.
The invention also discloses a kind of temperature detect switch (TDS) condition detection methods, applied to the power control electricity based on zero passage detection
Road, which is characterized in that the power control circuit includes temperature detect switch (TDS), power switch and zero cross detection circuit, and the temperature control is opened
Off status detection method includes:
It is raw by the zero cross detection circuit in input voltage zero crossing if the temperature detect switch (TDS) is in an ON state
At level energizing signal；
If the temperature detect switch (TDS) is in an off state, by zero cross detection circuit output low level signal, and
When the duration that the zero cross detection circuit continuously exports low level signal is greater than preset duration threshold value, controls the power switch and close
It is disconnected.
The above-mentioned power control circuit based on zero passage detection, Poewr control method and temperature detect switch (TDS) condition detection method, are adopted
Level energizing signal is generated with zero cross detection circuit, number is overturn according to level and controls power switch on or off, Ke Yijing
The really working time of control heater, therefore the average heating power of heater can be accurately controlled, since power switch is in voltage
Zero crossing is connected, and interference can be reduced on, and due to using temperature detect switch (TDS), can be automatically powered off when there is abnormal heating, while institute
The power switch shutdown can be controlled, improve power control in the disconnection for detecting temperature detect switch (TDS) by stating zero cross detection circuit
The safety of circuit.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the power control circuit based on zero passage detection of one embodiment of the invention；
Fig. 2 is the structural schematic diagram of the micro-control unit of one embodiment of the invention；
Fig. 3 is the structural schematic diagram of the power control circuit based on zero passage detection of another embodiment of the present invention；
Fig. 4 is the circuit diagram of the zero cross detection circuit of one embodiment of the invention；
Fig. 5 is the flow diagram of the Poewr control method of one embodiment of the invention；
Fig. 6 is the flow diagram of the temperature detect switch (TDS) condition detection method of one embodiment of the invention.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this hair
It is bright.But the invention can be embodied in many other ways as described herein, those skilled in the art can be not
Similar improvement is done in the case where violating intension of the present invention, therefore the present invention is not limited by the specific embodiments disclosed below.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
Referring to Fig. 1, it is that the structure for the power control circuit based on zero passage detection that one embodiment of the invention provides is shown
It is intended to.The power control circuit is applied to the electric appliance with heating function, including but not limited to electric kettle, electromagnetic oven, electricity
Pot for cooking rice, electrical boiler, water heater, warm-air drier etc..As shown in Figure 1, the power control circuit 100 includes temperature detect switch (TDS) K1, power
Switch K2, micro-control unit 10, heater 20 and zero cross detection circuit 30, wherein temperature detect switch (TDS) K1 be separately connected firewire ACL and
Heater 20；Power switch K2 is separately connected zero curve ACN, heater 20 and MCU10；Zero cross detection circuit 30 is separately connected heating
The connecting node and MCU10 of device 20 and temperature detect switch (TDS) K1, specifically, the input terminal of zero cross detection circuit 30 connection heater 20 with
The output end of the connecting node of temperature detect switch (TDS) K1, zero cross detection circuit 30 connects MCU10.
In the present embodiment, temperature detect switch (TDS) K1 is used to turn off when temperature is higher than the first preset temperature, in temperature lower than the
It is connected when two preset temperatures, wherein first preset temperature is greater than or equal to the second preset temperature.
For example, temperature detect switch (TDS) K1 is Kick type temperature detect switch (TDS), such as bimetal leaf Kick type temperature detect switch (TDS), first is default at this time
Temperature and the second preset temperature are related with the material of temperature detect switch (TDS) K1.For example, temperature detect switch (TDS) K1 is thermistor-type temperature detect switch (TDS),
The first preset temperature and the second preset temperature are related with the impedance of thermistor at this time.For example, temperature detect switch (TDS) K1 is liquid expansion
Formula temperature detect switch (TDS) or pressure type temperature detect switch (TDS) etc..In practical applications, it can be controlled according to temperature and need that suitable temperature control is selected to open
Close K1.
In the present embodiment, power switch K2 is controllable switch, such as thyristor, such as relay.Specifically, power is opened
The control electrode for closing K2 connects MCU10, and for receiving the control signal of MCU10 output, power switch K2 is received according to control electrode
Control signal conduction or shutdown.
In the present embodiment, power control circuit is by mains-supplied, wherein in temperature detect switch (TDS) K1 connection alternating current input line
Firewire ACL, power switch connect the zero curve ACN in alternating current input line.When temperature detect switch (TDS) K1 and power switch K2 are both turned on, temperature
Control switch K1, power switch K2 and heater 20 form heating circuit between firewire and zero curve, and heater work generates heat.
When any of temperature detect switch (TDS) K1 or power switch K2 shutdown, heating circuit can not be formed, heater stops working.Wherein,
Alternating current is the alternating current of sinusoidal waveform, and there are zero crossings, such as becomes positive when polarity of voltage is from just becoming negative or from negative
In the process, when voltage value is close to zero or null, as zero crossing.When temperature detect switch (TDS) K1 conducting, zero cross detection circuit
30 input terminal is by temperature detect switch (TDS) K1 connection firewire, and when alternating current zero passage, zero cross detection circuit 30 detects zero cross signal, and
Output level energizing signal.Such as zero cross detection circuit 30 exports high level originally, when detecting zero cross signal, is changed into defeated
Low level out；Such as zero cross detection circuit 30 exports low level originally, when detecting zero cross signal, is changed into the high electricity of output
It is flat, thus generate level energizing signal.For example, zero cross detection circuit 30 is by exporting low electricity when line voltage is from just becoming negative
Flat turn becomes exporting high level, becomes timing from negative in line voltage, zero cross detection circuit 30 is changed into defeated by output high level
Low level out.
In the present embodiment, MCU10, which is used to overturn number according to the level of level energizing signal, controls the power switch
On or off.Such as shown in Fig. 2, MCU10 includes logging modle 11 and control module 12, and wherein logging modle 11 is used in function
When rate switch K2 is connected, the first level of record overturns number；Control module 12 is used to reach first number when level overturning number
When threshold value N1, control power switch K2 shutdown；Logging modle 11 is also used to when power switch K2 is turned off, and record second electrical level turns over
Turn number；Control module 12 is also used to control power switch K2 when second electrical level overturns number and reaches the second frequency threshold value N2
Conducting.In power switch K2 conducting, the first level of start recording overturns number to logging modle 11 again.Wherein, due to function
Rate switch K2 is connected in line voltage zero crossing, i.e. line voltage is close to zero when power switch K2 is connected, therefore power switch
The interference that K2 connects moment generation is smaller, can reduce the interference to power control circuit.
Wherein, the first level overturning number and second electrical level overturning number are not to preset reversed level overturning number, or not
The level for limiting direction overturns number.For example, the first level overturning number and second electrical level overturning number are to be turned to from low level
The number of high level, alternatively, to be turned to low level number from high level, alternatively, to be turned to high level from low level
Number with from high level be turned to the sum of low level number.Specifically, MCU10 passes through internal counter records level overturning
Number, for example, counting when detecting the rising edge of output signal of zero cross detection circuit 30 and adding one, to count by low level
It is turned to the number of high level；For example, count when detecting the failing edge of output signal of zero cross detection circuit 30 and add one,
Low level number is turned to by high level with statistics；For example, in the rising for the output signal for detecting zero cross detection circuit 30
It when edge or failing edge, counts and adds one, the number of high level is turned to from low level with statistics and is turned to low level from high level
The sum of number.
When the temperature that heater normal heating, temperature detect switch (TDS) K1 are detected is no more than the first preset temperature, temperature detect switch (TDS)
K1 maintains conducting.MCU10 is according to the first level overturning number, second electrical level overturning number, the first frequency threshold value N1 and second
Number threshold value N2 controls power switch K2 on or off.Specifically, when power switch K2 is connected, power is worked as in heater work
When switch K2 is turned off, heater stops working, when by controlling work of the turn-on time of power switch K2 to control heater
Between, and then control the average heating power of heater.For example, if power when heater is heated is PN, then averagely heat
Power is P0=N1/ (N1+N2) * PN.It, can be by adjusting first number in order to realize that more power regulations and power control refine
The setting numerical values recited of threshold value N1 and the second frequency threshold value N2, to control actual average heating power.
There is abnormal heating in heater, when the temperature that temperature detect switch (TDS) K1 is detected is higher than the first preset temperature, temperature control is opened
It closes K1 to disconnect, cut off the power, heater is stopped working due to that can not be formed into a loop, and until temperature declines, temperature detect switch (TDS) K1 exists
The temperature detected is connected again when being lower than the second preset temperature, and heater is resumed work.
Wherein, when temperature detect switch (TDS) K1 is disconnected, zero cross detection circuit 30 is no longer detected due to disconnecting with firewire ACL
Zero cross signal and generation level energizing signal, but export low level signal, i.e. MCU10 can't detect level energizing signal.For
Raising safety, in one embodiment, MCU10 are also used to be greater than in duration that level energizing signal is continuously not detected pre-
If when duration threshold value, that is, when the duration that zero cross detection circuit 30 continuously exports low level signal is greater than preset duration threshold value, control
Power switch K2 shutdown, in this way, when there is abnormal heating, and when temperature does not drop to the second preset temperature in preset duration,
Even if temperature declines later, temperature detect switch (TDS) K1 is connected again, and since power switch K2 is turned off, heater will not add again automatically
Heat, with the safety of safeguards system.
In one embodiment, as shown in figure 3, in addition to MCU10, heater 20, zero cross detection circuit 30, temperature detect switch (TDS) K1
And except power switch K2, above-mentioned power control circuit 100 further includes at least one of thermal cut-off 40 and alarm 50.
Wherein, alarm 50 is connect with MCU10, when the duration that level energizing signal is continuously not detected is greater than preset duration
When threshold value, MCU10 drives alarm 50 to generate alarm signal, to prompt user to debug.For example, alarm 50 includes language
Sound alarm unit is alarmed for issuing prompt tone or playing the voice content prestored；For example, alarm 50 includes LED mono-
Member, is used for luminous alarm, and the light for such as issuing pre-set color is alarmed；For example, alarm 50 includes wireless communication unit, use
It is wirelessly connected in being established with user equipment, sends warning message by being wirelessly connected to user equipment.For example, wireless communication unit
Including at least one of WiFi unit, bluetooth unit, NFC unit or ZigBee unit.
Thermal cut-off 40 is connected between power switch K2 and zero curve.If abnormal heating occurs in heater 20, and temperature control is opened
Closing K1 failure can not disconnect, and when temperature reaches the fusing-off temperature of thermal cut-off 40, thermal cut-off 40 is disconnected to cut off the power, and make
Heater stops heating, and the duplicate protection to control circuit is realized by temperature detect switch (TDS) K1 and thermal cut-off 40.Wherein, thermal cut-off
40 fusing-off temperature is greater than or equal to above-mentioned first preset temperature.
In one embodiment, other than the thermal cut-off 40 being connected between power switch K2 and zero curve, in temperature control
Another thermal cut-off is also connected between switch K1 and firewire ACL, in the abnormal heating of heater 20, temperature detect switch (TDS) K1 failure
In the case where being unable to control temperature, the disconnection when temperature reaches the fusing-off temperature of the thermal cut-off keeps entire circuit and firewire disconnected
Connection is opened, avoids hot voltage from causing to get an electric shock by human body and ground forming circuit, further promotes circuit safety.
In one embodiment, above-mentioned power control circuit further includes LED array, such as 8*8LED array, such as 16*
16LED array, such as 5*10LED array, such as 4*16LED array.The LED array is connect with MCU10.The MCU10 is also
For driving the LED array according to the output signal of zero cross detection circuit 30, for example, driving in the LED array at least
One LED shines, and luminous LED is made to form predetermined pattern or text.For example, when the continuous non-output level of zero cross detection circuit 30
When the duration of energizing signal is greater than preset duration threshold value, at least one LED in the LED array is driven to shine, composition is default
Text of alarming or preset alarm pattern；For example, the level energizing signal that MCU10 detection zero cross detection circuit 30 exports, when first
When level overturning number reaches the first frequency threshold value, drives at least one LED in the LED array to shine, form " heat preservation "
Printed words or composition represent the pattern of heat preservation；For another example, when second electrical level overturning number reaches the second frequency threshold value, described in driving
At least one LED in LED array shines, and forms " heating " printed words or composition represents the pattern of heating.
In one embodiment, as shown in figure 4, zero cross detection circuit 30 includes: resistance R1, resistance R2, resistance R3, resistance
R4, diode D1, triode Q1, capacitor C1 and capacitor C2, wherein triode Q1 is PNP type triode or NPN type triode, figure
4 are illustrated so that triode Q1 is PNP type triode as an example.
The base stage of triode Q1 passes through the connecting node of resistance R1 connection heater and temperature detect switch (TDS), the current collection of triode Q1
Pole is separately connected the first end of resistance R3 and the first end of resistance R4, and the emitter of triode Q1 is for being grounded；The of resistance R3
Two ends connect MCU as the output end of zero cross detection circuit for accessing VCC voltage, the second end of resistance R4；Capacitor C2 difference
Connect the second end of resistance R3 and the second end of resistance R4；The base stage of the positive connecting triode Q1 of diode D1, diode D1
Cathode ground connection；Resistance R2 and capacitor C1 are in parallel with diode D1 respectively.
Wherein, the voltage value of VCC voltage is related with the type of triode Q1, for example, if triode Q1 is PNP triode,
Then VCC voltage is -5V.
Alternating current is sine wave alternating current, when temperature detect switch (TDS) K1 is connected, the input terminal and firewire ACL of zero cross detection circuit 30
It is connected, resistance R1 and resistance R2 series connection are followed by between firewire ACL and zero curve ACN.Resistance R1 and resistance R2 passes through for dividing
Adjust the resistance value ratio size of resistance R1 and resistance R2, the voltage that adjustable resistance R1 and the both ends resistance R2 are shared.For example,
In order to make triode Q1, closer to realization signal overturning at zero crossing, make the resistance value of resistance R1 much larger than resistance in line voltage
The resistance value of R2.
In the positive half cycle of line voltage, when line voltage is less than the conduction voltage drop of diode D1, diode D1 is not turned on.When
When line voltage is greater than the conduction voltage drop of diode D1, diode D1 conducting, the voltage at the both ends resistance R2 is snapped as diode
The conducting voltage of D1, such as 0.7V.If triode Q1 is PNP triode, since base potential is higher than emitter potential, it is unsatisfactory for
The turn-on condition of triode Q1, therefore triode Q1 ends, VCC voltage exports negative electricity after resistance R3 and resistance R4 partial pressure
Pressure, the second terminal potential of resistance R4 are negative, output end of the second end of resistance R4 as zero cross detection circuit, export low level.
In the negative half period of line voltage, because of the one-way conduction of diode D1, diode D1 cut-off.If triode Q1 is
PNP triode, when line voltage is less than the conduction voltage drop of triode Q1, triode Q1 is not turned on；When line voltage is greater than three
When the conduction voltage drop of pole pipe Q1, such as when line voltage greatly 0.7V, triode Q1 conducting, the second end of resistance R4 is as zero passage
The output end of detection circuit exports high level.
According to the above analysis it is found that when temperature detect switch (TDS) K1 is connected, it is in line voltage zero crossing, such as in line voltage
The vicinity ± 0.7V, the output signal of zero cross detection circuit 30 realize low and high level overturning, overturn and believe to MCU10 output level
Number, to the rising edge of MCU10 detection level energizing signal or failing edge and be counted.When temperature detect switch (TDS) K1 shutdown, mistake
Zero detection circuit 30 can not form access, and triode Q1 can not be connected, and the output end of zero cross detection circuit 30 exports always low electricity
It is flat, so that MCU10 can not detect level energizing signal.
The above-mentioned power control circuit based on zero passage detection generates level energizing signal using zero cross detection circuit, according to
Level overturns number and controls power switch on or off, can accurately control the working time of heater, therefore can accurately control
The average heating power of heater processed can reduce on interference since power switch is connected in voltage over zero, due to using temperature
Control switch can automatically power off when there is abnormal heating, improve the safety of power control circuit.
The embodiment of the present invention also provides a kind of Poewr control method, such as heating power control method.The power control side
Method can be realized by the above-mentioned power control circuit based on zero passage detection.As shown in figure 5, above-mentioned Poewr control method includes:
S101, judges whether temperature is lower than the second preset temperature, is to then follow the steps S102.
For example, judging whether temperature is lower than the second preset temperature according to the state of temperature detect switch (TDS).If temperature detect switch (TDS) is connected,
Determine that temperature is lower than the second preset temperature, otherwise determines that temperature is not less than the second preset temperature.
S102 generates level energizing signal in input voltage zero crossing.
S103 overturns number according to the level of the level energizing signal and controls the power switch on or off.
In one embodiment, step S103 includes:
In power switch conducting, the first level of record overturns number；
When level overturning number reaches the first frequency threshold value, the power switch shutdown is controlled；
In power switch shutdown, record second electrical level overturns number；
When second electrical level overturning number reaches the second frequency threshold value, the power switch conducting is controlled.
In one embodiment, above-mentioned Poewr control method further include:
If level energizing signal is not detected within a preset time, the power switch shutdown is controlled.
In one embodiment, above-mentioned Poewr control method further include:
If level energizing signal is not detected within a preset time, alarm signal is generated.
Above-mentioned Poewr control method overturns number according to level and controls power switch on or off, can accurately control
The working time of heater, therefore can accurately control the average heating power of heater.
The embodiment of the present invention also provides a kind of temperature detect switch (TDS) condition detection method, which can be by above-mentioned
Power control circuit based on zero passage detection is realized.As shown in fig. 6, above-mentioned temperature detect switch (TDS) condition detection method includes:
Whether in an ON state S201 judges temperature detect switch (TDS), is to then follow the steps S202, no to then follow the steps S203.
S202 generates level energizing signal by zero cross detection circuit in input voltage zero crossing.
S203 exports low level signal by the zero cross detection circuit.
S204, when the duration that the zero cross detection circuit continuously exports low level signal is greater than preset duration threshold value, control
Make the power switch shutdown.
Above-mentioned temperature detect switch (TDS) condition detection method, is able to detect the state of temperature detect switch (TDS), when temperature detect switch (TDS) disconnects, control
Power switch shutdown, to improve the safety of power control circuit.
It should be noted that in embodiment described above, when an element is considered " connecting " another element, it can be with
It is directly to another element or may be simultaneously present intermediary element.On the contrary, when element be referred to as " direct " and
When another element connects, intermediary element is not present.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (8)
1. a kind of power control circuit based on zero passage detection, including micro-control unit and heater, which is characterized in that also wrap
It includes:
Temperature detect switch (TDS), is separately connected firewire and heater, and the temperature detect switch (TDS) is used to close when temperature is higher than the first preset temperature
It is disconnected, it is connected when temperature is lower than the second preset temperature, wherein first preset temperature is greater than or equal to the second preset temperature；
Power switch is separately connected the micro-control unit, the heater and zero curve；
Zero cross detection circuit, input terminal are separately connected the heater and the temperature detect switch (TDS), and output end connection is described micro-
Control unit, the zero cross detection circuit are used to generate level in input voltage zero crossing in temperature detect switch (TDS) conducting
Energizing signal is also used to export low level signal when the temperature detect switch (TDS) disconnects；
The micro-control unit controls the power switch conducting for overturning number according to the level of the level energizing signal
Or shutdown；
The micro-control unit includes logging modle and control module,
The logging modle, in power switch conducting, the first level of record to overturn number；
The control module, for controlling the power switch and closing when the first level overturning number reaches the first frequency threshold value
It is disconnected；
The logging modle is also used to when the power switch turns off, and record second electrical level overturns number；
The control module is also used to control the power switch when second electrical level overturns number and reaches the second frequency threshold value
Conducting.
2. power control circuit as described in claim 1, which is characterized in that the micro-control unit is also used to:
When the duration that level energizing signal is continuously not detected is greater than preset duration threshold value, the power switch shutdown is controlled.
3. power control circuit as described in claim 1, which is characterized in that the zero cross detection circuit, comprising: resistance R1, electricity
Hinder R2, resistance R3, resistance R4, diode D1, triode Q1, capacitor C1 and capacitor C2, in which:
The base stage of the triode Q1 connects the connecting node of the heater Yu the temperature detect switch (TDS), institute by the resistance R1
The collector for stating triode Q1 is separately connected the first end of resistance R3 and the first end of resistance R4, the emitter of the triode Q1
For being grounded；
The second end of the resistance R3 is for accessing VCC voltage, and the second end of the resistance R4 is as the zero cross detection circuit
Output end connect the micro-control unit；
The capacitor C2 is separately connected the second end of the resistance R3 and the second end of the resistance R4；
The anode of the diode D1 connects the base stage of the triode Q1, the cathode ground connection of the diode D1；
The resistance R2 and the capacitor C1 are in parallel with the diode D1 respectively.
4. the power control circuit as described in any one of claims 1 to 3, which is characterized in that the power control circuit also wraps
Thermal cut-off is included, the thermal cut-off is connected between the power switch and the zero curve.
5. the power control circuit as described in any one of claims 1 to 3, which is characterized in that the power control circuit also wraps
Alarm is included, the alarm connects the micro-control unit；
The micro-control unit is also used to when the duration that level energizing signal is continuously not detected is greater than preset duration threshold value,
The alarm is driven to generate alarm signal.
6. power control circuit as described in claim 1, which is characterized in that the power switch is thyristor, the thyristor
Control electrode connect the micro-control unit.
7. a kind of Poewr control method, applied to as described in claim 1 based on the power control circuit of zero passage detection, spy
Sign is, comprising:
According to the state of the temperature detect switch (TDS), judge whether temperature is lower than the second preset temperature；
If being judged as YES, level energizing signal is generated in input voltage zero crossing；
Number, the conducting of power switch described in the micro-control unit controls or pass are overturn according to the level of the level energizing signal
It is disconnected；
It is described that number control power switch on or off is overturn according to the level of the level energizing signal, comprising:
In power switch conducting, the micro-control unit records the first level and overturns number；
When level overturning number reaches the first frequency threshold value, power switch shutdown described in the micro-control unit controls；
In power switch shutdown, the micro-control unit record second electrical level overturns number；
When second electrical level overturning number reaches the second frequency threshold value, power switch conducting described in the micro-control unit controls.
8. a kind of temperature detect switch (TDS) condition detection method, applied to as described in claim 1 based on the power control of zero passage detection
Circuit characterized by comprising
If the temperature detect switch (TDS) is in an ON state, electricity is generated by the zero cross detection circuit in input voltage zero crossing
Flat energizing signal；
If the temperature detect switch (TDS) is in an off state, low level signal is exported by the zero cross detection circuit, and described
When the duration that zero cross detection circuit continuously exports low level signal is greater than preset duration threshold value, the power switch shutdown is controlled.
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| CN201610811023.XA CN106444890B (en) | 2016-09-08 | 2016-09-08 | Power control circuit based on zero-crossing detection, power control method and temperature control switch state detection method |
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| CN201610811023.XA CN106444890B (en) | 2016-09-08 | 2016-09-08 | Power control circuit based on zero-crossing detection, power control method and temperature control switch state detection method |
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| WO2019020085A1 (en) * | 2017-07-26 | 2019-01-31 | 佛山市顺德区美的电热电器制造有限公司 | Sampling current processing circuit, power detection circuit and electromagnetic cooking device |
| CN109307796B (en) * | 2017-07-26 | 2024-08-13 | 佛山市顺德区美的电热电器制造有限公司 | Sampling current processing circuit, power detection circuit and electromagnetic cooking utensil |
| CN107436577B (en) * | 2017-08-08 | 2023-05-23 | 珠海格力电器股份有限公司 | Power control circuit and method based on zero-crossing detection |
| CN111090239A (en) * | 2018-10-24 | 2020-05-01 | 深圳阿凡达智控有限公司 | Control method, control device, intelligent equipment and computer storage medium |
| CN109394129A (en) * | 2018-11-20 | 2019-03-01 | 佛山市顺德区美的洗涤电器制造有限公司 | Heat spray module and dish-washing machine |
| CN114364063A (en) * | 2022-01-21 | 2022-04-15 | 深圳市飞象智能家电科技有限公司 | Zero-crossing counting heating control circuit |
| CN116382385B (en) * | 2023-04-03 | 2024-03-05 | 无锡市稳先微电子有限公司 | Temperature control method, temperature control circuit, intelligent electronic switch and automobile |
| CN117949778B (en) * | 2024-01-18 | 2024-10-18 | 国网青海省电力公司海西供电公司 | Arc light ground fault simulation system based on MCU |
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