CN107436577A - Power control circuit and method based on zero-crossing detection - Google Patents
Power control circuit and method based on zero-crossing detection Download PDFInfo
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- CN107436577A CN107436577A CN201710671513.9A CN201710671513A CN107436577A CN 107436577 A CN107436577 A CN 107436577A CN 201710671513 A CN201710671513 A CN 201710671513A CN 107436577 A CN107436577 A CN 107436577A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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Abstract
The invention relates to a power control circuit and a method based on zero-crossing detection, wherein the circuit comprises a power-off reset temperature limiter, wherein the power-off reset temperature limiter is formed by connecting a temperature switch and a PTC resistor in parallel, and the temperature limiter is connected with a live wire and a heating device; the power switch is respectively connected with the zero line, the heating device and the micro control unit; the input end of the zero-crossing detection circuit is respectively connected with the heating device and the temperature limiter, the output end of the zero-crossing detection circuit is connected with the micro control unit, and the zero-crossing detection circuit is used for detecting a zero-crossing signal and providing the zero-crossing signal to the micro control unit; and the micro control unit judges whether the duration time T1 of the zero-crossing signal is greater than or equal to a preset threshold value T1, and if not, sends a switch closing signal to control the power switch to be closed continuously. The invention can realize the multiplexing of the power switch and improve the safety of the heating appliance.
Description
Technical field
The present invention relates to electronic technology field, in particular to a kind of power control circuit based on zero passage detection and
Method.
Background technology
In the prior art, have much to the method being controlled during heating utensil exception, such as pass through NTC sensor merely
Detection heating implement temperature, and it is expected timely and effectively to protect heater circuit in temperature anomaly, but it is this
Mode can not reach the effect to heating the timely and effective protection of utensil because NTC sensor autoreactivity speed is slow.
In the prior art, zero passage detection, temperature detect switch (TDS), micro-control unit (MicrocontrollerUnit, MCU) are passed through
With reference to mode, realize the function control to heating utensil and protection, but this mode is not accounted in temperature controller exception
How power-off restoration the problem of, do not meet IEC Safety Approval requirements, do not account for the multiplexing of component yet, so as to cost-effective
The problem of.
Therefore, how to be powered off when the power control circuit based on zero passage detection at least has temperature controller exception in the prior art
Reset and how to be multiplexed component with it is cost-effective the problems such as.
The content of the invention
For problem above, the present invention proposes a kind of power control circuit based on zero passage detection, and it passes through the mistake of detection
Zero-signal dynamic control power switch so that power switch can either control heater to have normal work when heat generation device is normal
Make, heating utensil can also be protected in circuit abnormality, so as to realize the multiplexing of power switch, save cost.This
Invention introduces power-off restoration temperature limiter and solves the problems, such as to be not directed to power-off restoration in the prior art, further improves the peace of circuit
Quan Xing.
The invention provides a kind of power control circuit based on zero passage detection, including micro-control unit and heater element,
Characterized in that, the circuit also includes：
Power-off restoration temperature limiter, its both ends connect live wire and heater element respectively, and the power-off restoration temperature limiter is by parallel connection
Temperature switch and PTC resistor composition；
Power switch, zero line, heater element and the micro-control unit are connected respectively；
Zero cross detection circuit, its input connect the heater element and the power-off restoration temperature limiter respectively, and it is exported
End connects the micro-control unit, and the zero cross detection circuit is used to detect zero cross signal CHECK and is supplied to micro-control unit；
Micro-control unit, judges whether the duration T 1 of the zero cross signal is more than or equal to predetermined threshold value t1, if
It is no, then send switch closure signals and control the power switch persistently to close.
Further, the micro-control unit, the power switch is controlled persistently to close it sending switch closure signals
Afterwards, judge whether to detect the zero cross signal in scheduled duration and whether the zero cross signal duration T 2 is more than or equal to
Predetermined threshold value t2, if the zero cross signal in scheduled duration be present and the zero cross signal duration T 2 is more than or equal to
T2, then send switching drive signal and control the power switch interruption closure.
Further, the micro-control unit, judge whether the duration T 1 of the zero cross signal is more than or equal to and preset
Threshold value t1, if it is, sending switching drive signal controls the power switch interruption closure.
Further, the micro-control unit sends the driving of interruption closure at alternating current zero passage to the power switch
Signal.
Further, in addition to alarm unit, the micro-control unit, the power is controlled sending switch closure signals
After the lasting closure of switch, judge the zero cross signal and the zero cross signal duration whether are detected in scheduled duration
Whether T2 is more than or equal to predetermined threshold value t2, if the zero cross signal in scheduled duration be present, or in scheduled duration
The zero cross signal be present and the zero cross signal duration T 2 is less than predetermined threshold value t2, then send alarm signal to list of alarming
Member.
Further, the micro-control unit, after alarm signal is sent, the duration of the zero cross signal is judged
Whether T1 is more than or equal to predetermined threshold value t1, if YES, then sends and switches off signal to the power switch.
Further, the micro-control unit, after power switch disconnection, power-off restoration is performed.
Further, the micro-control unit, after alarm signal is sent, the duration of the zero cross signal is judged
Whether T1 is more than or equal to predetermined threshold value t1, if NO, then sends switch and continues closure signal to the power switch.
Further, the control circuit also includes thermal fuse-link, and the thermal fuse-link is connected to the zero line and described
Between power switch.
Further, power-off restoration temperature limiter, thermal fuse-link and the heater members are arranged on same heater members
On support.
Present invention also offers a kind of Poewr control method, and it is applied to the power control circuit based on zero passage detection, institute
Stating Poewr control method includes：
Judge whether the duration T 1 of the zero cross signal is more than or equal to predetermined threshold value t1, if NO, then send and open
Closing closure signal controls the power switch persistently to close.
Further, after sending switch closure signals and controlling the power switch persistently to close, judge in pre- timing
The zero cross signal whether is detected in long and whether the zero cross signal duration T 2 is more than or equal to predetermined threshold value t2, if
The zero cross signal in scheduled duration be present and the zero cross signal duration T 2 is more than or equal to t2, then send switch drive
Signal controls the power switch interruption closure.
Further, judge whether the duration T 1 of the zero cross signal is more than or equal to predetermined threshold value t1, if it is,
Send switching drive signal and control the power switch interruption closure.
Further, the micro-control unit sends the driving of interruption closure at alternating current zero passage to the power switch
Signal.
Further, after sending switch closure signals and controlling the power switch persistently to close, judge in pre- timing
The zero cross signal whether is detected in long and whether the zero cross signal duration T 2 is more than or equal to predetermined threshold value t2, if
The zero cross signal in scheduled duration be present, or the zero cross signal and the zero cross signal in scheduled duration be present
Duration T 2 is less than predetermined threshold value t2, then sends alarm signal to alarm unit.
Further, after alarm signal is sent, judge whether the duration T 1 of the zero cross signal is more than or equal to
Predetermined threshold value t1, if YES, then send and switch off signal to the power switch.
Further, after power switch disconnection, power-off restoration is performed.
Further, after alarm signal is sent, judge whether the duration T 1 of the zero cross signal is more than or equal to
Predetermined threshold value t1, if NO, then send switch and continue closure signal to the power switch.
The beneficial effect brought of technical scheme that the above embodiment of the present invention provides is：
Technical scheme sends different drive signal controls by the judgement triggering micro-control unit of zero cross signal
Power switch discontinuous processed or continuous firing, so as to realize the multiplexing of power switch, to a certain extent save product into
This；The present invention is also by repeatedly judging that zero cross signal investigates the exception of temperature limiter induced fault, and abnormal event occur in temperature limiter
In the case of barrier, complete machine power-off restoration can be controlled by software, improve the security of heating utensil.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, make required in being described below to embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is the structural representation of the power control circuit embodiment one based on zero passage detection；
Fig. 2 is the circuit diagram of power-off restoration temperature limiter；
Fig. 3 is the circuit diagram of the power control circuit embodiment one based on zero passage detection；
Fig. 4 is the structural representation of the power control circuit embodiment two based on zero passage detection；
Fig. 5 is the circuit diagram of the power control circuit embodiment two based on zero passage detection；
Fig. 6 is temperature limiter, thermal fuse-link scheme of installation；
Fig. 7 is zero cross signal waveform diagram；
Fig. 8 is the voltage waveform view at power switch both ends；
Fig. 9 is Poewr control method flow chart.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is further described in detail.
Fig. 1 is a kind of structural representation for power control circuit based on zero passage detection that one embodiment of the invention provides.
As shown in figure 1, the circuit includes micro-control unit and heater element etc.；Also include,
Power-off restoration temperature limiter, live wire (ACL) and heater element are connected respectively；
Power switch, zero line (ACN), heater element and micro-control unit (i.e. MCU units) are connected respectively；
Zero cross detection circuit, its input connect the heater element and the power-off restoration temperature limiter respectively, and it is exported
End connects the micro-control unit；
Micro-control unit, zero cross detection circuit, power switch and warning circuit are connected respectively, the micro-control unit, is sentenced
Whether the duration T 1 of the disconnected zero cross signal is more than or equal to predetermined threshold value t1, if NO, then sends switch closure signals
The power switch is controlled persistently to close.
Wherein, the circuit structure of power-off restoration temperature limiter, as shown in Fig. 2 the power-off restoration temperature limiter includes parallel connection
Temperature switch K1 and PTC resistor R1.The power-off restoration temperature limiter operation principle is：When temperature limiter normal work, temperature switch
K1 is closed, and PTC resistor, which is short-circuited, not to work；When temperature limiter operation irregularity, because temperature raises, temperature switch K1 disconnects, PTC
Resistance accesses, and electric current forms loop by PTC resistor so that circuit is always maintained at off-state.When close general supply, at a temperature of
When being down to predetermined recovery temperature, temperature switch recovers to close rapidly.In circuit using meeting temperature control as defined in safety law
Device, can be in temperature overheating or when there is dry combustion method overheat condition, it is necessary to work, i.e. power-off restoration temperature limiter could be resetted after power-off
Apply, can not be started shooting again work after complete machine overheat can be realized, it is necessary to power-off restoration in small household electrical appliance.For temperature limiter
Basic parameter, such as rated function temperature, recovery temperature, rated voltage, rated current, this area would generally be in normal use
In the range of choose, as rated function temperature is higher, general more than 100 DEG C, recovery temperature is than relatively low, general only tens degree,
Scope is bigger, such as recovery temperature is 40 DEG C~60 DEG C.
The above embodiment of the present invention, micro-control unit, the zero passage exported by judging the zero cross detection circuit
Whether signal is normal, produces different drive signals.And the drive signal that power switch is sent according to MCU units correspondingly performs
Interruption closure, or lasting closure, or disconnect, realize the multiplexing of power switch.
The above embodiment of the present invention, the operation principle of physical circuit is as shown in figure 3, ACL and CAN are respectively alternating current L
Line, the input of N lines.Temperature limiter (i.e. power-off restoration temperature limiter) is connected with ACL, heater members HEATER, zero cross detection circuit respectively,
Wherein, CHECK is the input of zero cross detection circuit.Zero cross detection circuit requires that input resistance is very big, it is desirable to zero cross detection circuit
Resistance is approximately equal to the resistance of heater members after in parallel with heater members.Design parameter can be adjusted according to actual conditions in circuit
It is whole.Power switch TR1 is connected with ACN, MCU unit respectively, and MCU units are by sending HEAT signals (i.e. drive signal) to power
Switch TR1 is controlled.
The above embodiment of the present invention, be judged as under normal circumstances in CHECK signals (i.e. zero cross signal), MCU units to
Power switch TR1 sends HEAT signals (HEAT signal definitions now are switching drive signal), the switching drive signal control
Make the power switch interruption closure so that the heater element HEATER normal works in the present embodiment.
Wherein, MCU units control the power switch TR1 interruptions closure to refer to MCU units according to switching drive signal control
Power switch processed opens shut-off, so as to accurately control heating power.
In one or more optional embodiments, can use copped wave, control open the cycle, at zero passage to the work(
Rate switch carries out the modes such as break-make control.Preferably, the break-make control of the power switch is carried out at zero passage, this mode can
To reduce the influence of switch power loss and electromagnetic interference, heating power is accurately controlled.
The above embodiment of the present invention, in the case where CHECK signals (i.e. zero cross signal) are judged as exception, the MCU
Unit sends HEAT signals (now HEAT signal definitions are switch closure signals), the switch closure letter to power switch TR1
Number control power switch persistently closes.After CHECK signals described in the MCU unit judges are exception, the MCU units
The power switch TR1 is controlled persistently to close, so that the continuous heating of heater members HEATER described in circuit.When the heating
Device HEATER continuous heatings to circuit temperature rises to the rated function temperature of temperature limiter, and the temperature switch K1 for forcing temperature limiter is in
Off-state, PTC resistor access circuit.Now, PTC resistor maintains the off-state of temperature limiter with heater members jointly, passes through
The PTC resistor of temperature limiter is protected to heater members, improves the security of circuit.
The above embodiment of the present invention, judge whether CHECK signals (i.e. zero cross signal) are normally by judging that zero passage is believed
Whether number duration T 1 is more than or equal to predetermined threshold value t1 to realize.If the judgment is Yes, then to be normal；Otherwise, judged
Zero-signal is abnormal.
Wherein, it is preferable to avoid MCU units that erroneous judgement occurs for predetermined threshold value t1 setting.Can be according to alternating current
Frequency, the cycle set.For example, ac frequency is 50/60HZ, each cycle 20ms/16.7ms, then predetermined threshold value t1 only need
It is greater than the cycle of zero cross signal.As shown in fig. 7, the zero cross signal that MCU units obtain typically inputs with complete machine alternating current
Cycle, time started, reversing time are consistent with the end time.
In an optional embodiment, by taking 50HZ as an example, limiting in 0.1s has 50 complete zero passage square-wave signals.It is right
Set in 0.1s time restrictions, by repeated detection zero cross signal, MCU units can be avoided to judge by accident.
In an optional embodiment, controllable silicon is may be selected in power switch TR1, and insulated gate bipolar can also be selected brilliant
Other switch elements such as body pipe IGBT, metal-oxide-semiconductor, pliotron.
The above embodiment of the present invention, in the case where CHECK signals (i.e. zero cross signal) are judged as exception, further set
Scheduled duration is put, and CHECK signals are detected in scheduled duration and judged again.The scheduled duration for example can be
5s.Particular by judging the CHECK signals and CHECK signal durations T2 whether are detected in scheduled duration
Whether predetermined threshold value t2 is more than or equal to.If the CHECK signals and the lasting CHECK signals in scheduled duration be present
Between T2 be more than or equal to predetermined threshold value t2, then send the switching drive signal and control the power switch TR1 interruptions closure.For
Predetermined threshold value t2 selection refers to predetermined threshold value t1 mode, such as t2 is set as 0.5s..MCU unit retriggered power is opened
Close TR1 and be interrupted closure according to switching drive signal so that heater element HEATER normal works.Pass through secondary detection zero cross signal
Failure cause is investigated, improves the operating efficiency of circuit.
The above embodiment of the present invention, if the CHECK signals in scheduled duration be present, or in scheduled duration
The CHECK signals inside be present and CHECK signal durations T2 are less than predetermined threshold value t2, then send alarm signal to report
Alert unit, now power switch TR1 is still in lasting closure state.Because zero cross detection circuit input resistance is very big, heating element
After part HEATER is connected in parallel, it is approximately equal to heater members HEATER resistance.Heater members HEATER and PTC resistor R1 is divided
Pressure, because PTC resistor R1 is much larger than heater members HEATER resistance, the voltage that heater members HEATER is assigned to is relatively low, zero passage inspection
Slowdown monitoring circuit will detect that abnormal zero cross signal.Persistent fever is maintained temperature switch off-state, heater members by PTC resistor R1
Also heating makes it be unable to reach the recovery temperature higher limit of temperature limiter to HEATER jointly simultaneously.So as to realize to heater members
HEATER protection.
The above embodiment of the present invention, MCU units send alarm signal to alarm unit, to prompt user to exclude event
Barrier, such as alarm include audio alert unit, are alarmed for sending prompt tone or playing the voice content to prestore；Example
Such as, alarm includes LED unit, and for luminous alarm, the light for such as sending pre-set color is alarmed；For example, alarm bag
Wireless communication unit is included, for establishing wireless connection with user equipment, warning message is sent to user equipment by wireless connection.
Wireless communication unit includes at least one of WiFi units, bluetooth unit, NFC unit or ZigBee units.
The above embodiment of the present invention, after alarm signal is sent, judging the duration T 1 of the CHECK signals is
It is no to be more than or equal to predetermined threshold value t1.If the judgment is Yes, then send and switch off signal to the power switch.
Now, the effect judged zero cross signal is that investigating temperature limiter whether there is exceptional reset, if depositing
In exceptional reset, then to power switch TR1 transmission HEAT signals, (now HEAT signal definitions are to switch off letter to MCU units
Number), power switch TR1 disconnects according to signal is switched off.Due to temperature limiter exceptional reset, cause heater members HEATER still
It is further protection circuit in continuous heating working condition, by software logic complete machine can be controlled to power off, added so as to protect
Thermal device, lift the security of circuit.
If the judgment is No, then it represents that circuit does not have temperature limiter exceptional reset, then complete machine passes through power-off restoration.
In an optional embodiment, as shown in figure 4, the circuit also includes thermal fuse-link, the thermal fuse-link connects
It is connected between the zero line and the power switch.Concrete operating principle circuit structure as shown in Figure 5, works as heater members
HEATER abnormal works, when causing the temperature to reach the fusing-off temperature of thermal fuse-link, then thermal fuse-link will be switched off cutting off the electricity supply so that
Whole circuit disconnects with zero line, forces heater element HEATER to stop heating, so as to realize the protection to control circuit.
In an optional embodiment, as shown in fig. 6, temperature limiter 2, thermal fuse-link 3 and heater members 4 are arranged on together
On one heater members support 1, the close installation of temperature limiter 2, thermal fuse-link 3 and heater members 4 is realized, can be to heating element
The temperature of part effectively react in time, so as to improve the reaction speed of temperature.
By above-described embodiment, send different drive signals using the judgement triggering micro-control unit of zero cross signal and control
Power switch discontinuous or continuous firing, it is achieved thereby that the multiplexing of power switch.By repeatedly judging that zero cross signal is investigated
The exception of temperature limiter induced fault, and in the case where abnormal failure occurs in temperature limiter, by software complete machine can be controlled to power off
Reset, further increase the security of heating utensil.
Fig. 9 is a kind of flow chart of Poewr control method provided in an embodiment of the present invention, and this method can pass through above-mentioned reality
Apply in example and realized based on the power control circuit of zero passage detection.In the circuit circuit connecting relation of each component such as Fig. 2 and
Shown in Fig. 5.
As shown in figure 9, the Poewr control method includes：
During beginning, whether zero cross detection circuit detection zero cross signal is normal and will determine that result is sent to MCU units.
Step S901, judge whether zero cross signal is normal.Wherein, judge whether zero cross signal is normally by judging zero passage
Whether signal duration T1 is more than or equal to predetermined threshold value t1 to realize.
In step S901, if the judgment is Yes, then to be normal, continuation step S902；Otherwise, judge zero cross signal to be different
Often, step S906 is continued.Judge that abnormal processing mode is：Judge whether the duration T 1 of the zero cross signal is more than or equal to
Predetermined threshold value t1, if NO, then MCU sends the switch closure signals control power switch and persistently closed.Believed by zero passage
Number control power switch continue or discontinuous so that switch when power switch is both heat generation device normal work, be work again
The device of utensil protection is participated in when making abnormal, realizes repeated use of device, saves product cost.
Wherein, it is preferable to avoid MCU units that erroneous judgement occurs for predetermined threshold value t1 setting.For example, according to exchange
The frequency of electricity, cycle are set.If ac frequency is 50/60HZ, each cycle 20ms/16.7ms, then predetermined threshold value t1 only need
It is greater than the cycle of zero cross signal.As shown in fig. 7, MCU units obtain zero cross signal typically with complete machine alternating current input the cycle,
Time started, reversing time are consistent with the end time.
In an optional embodiment, by taking 50HZ as an example, limit in 0.1s have 50 complete zero passage square-wave signals as
Normal condition.Set for 0.1s time restrictions, by repeated detection zero cross signal MCU units can be avoided to judge by accident.
Step S902, MCU unit sends switching drive signal.The switching drive signal is used to control the power switch
Interruption closure so that the heater element HEATER normal works in the present embodiment, and it is capable of the heating power of accurate control circuit.
In one or more optional embodiments, the switching drive signal can use copped wave, control open the cycle,
And the mode such as command signal extracted at zero passage.Break-make control is carried out to the power switch by switching drive signal,
It can accurately control the operating efficiency of heating power lifting circuit, and the effectively save energy.Preferably, institute is carried out at zero passage
The break-make control of power switch is stated, this mode can reduce the influence of switch power loss and electromagnetic interference.
Step S903, power switch perform cut-off/close.The switching drive signal that power switch is sent according to MCU units
Performed according to certain rule and open shut-off operation, so as to realize the heating power of power adjusting accurate control circuit, effectively saved
The about energy.
Step S904, heater members normal work.Heater members are heated, opened in power when power switch is opened
When shut-off is opened, stop heating.
Step S906, MCU unit send the lasting closure of switch closure signals driving power switch.Sentence in the MCU units
When the zero cross signal that breaks is abnormal, the MCU units control the power switch TR1 persistently to close, so that institute in circuit
State heater members HEATER continuous heatings.When the heater members HEATER continuous heatings cause circuit temperature to rise to temperature limiter
Rated function temperature, the temperature switch K1 for forcing temperature limiter are in off-state, and PTC resistor accesses circuit.Now, PTC electricity group with
Heater members maintain the off-state of temperature limiter jointly, so as to be protected by the PTC resistor of temperature limiter to heater members, carry
The high security of circuit.
In an optional embodiment, controllable silicon is may be selected in power switch TR1, and insulated gate bipolar can also be selected brilliant
Other switch elements such as body pipe IGBT, metal-oxide-semiconductor, pliotron.
Step S907, judge to detect normal zero cross signal in scheduled duration, and zero cross signal duration T 2 is more than
Equal to predetermined threshold value t2, if it is judged that being yes, then into step S902；Otherwise, then into S908；
The above embodiment of the present invention, in the case where zero cross signal is judged as exception, scheduled duration is further set, and
Detection is carried out to CHECK signals in scheduled duration and judges that zero cross signal whether there is.Firstly, for the setting of scheduled duration,
Selection can be considered by duration according to needed for temperature limiter recovers automatically.For example, choose 5S.CHECK signals are entered in scheduled duration
Row detection judges to be implemented as again by judging whether to detect CHECK signals and described in scheduled duration
Whether CHECK signal durations T2 is more than or equal to predetermined threshold value t2.Selection for predetermined threshold value t2 refers to predetermined threshold value t1
Mode, such as t2 is set as 0.5s.
If the CHECK signals in scheduled duration be present and CHECK signal durations T2 are more than or equal in advance
If threshold value t2, then send the switching drive signal and control the power switch TR1 interruptions closure.MCU unit retriggered work(
Rate switchs TR1 and is interrupted closure according to switching drive signal so that heater element HEATER normal works.Pass through secondary detection zero passage
Signal investigates failure cause, improves the operating efficiency of circuit.
Step S908, alarm；
The above embodiment of the present invention, if the CHECK signals in scheduled duration be present, or in scheduled duration
The CHECK signals inside be present and CHECK signal durations T2 are less than predetermined threshold value t2, then send alarm signal, together
When control power switch TR1 to be in continue closure state.
The above embodiment of the present invention, MCU units send alarm signal to alarm unit, to prompt user to exclude event
Barrier, such as alarm include audio alert unit, are alarmed for sending prompt tone or playing the voice content to prestore；Example
Such as, alarm includes LED unit, and for luminous alarm, the light for such as sending pre-set color is alarmed；For example, alarm bag
Wireless communication unit is included, for establishing wireless connection with user equipment, warning message is sent to user equipment by wireless connection.
Wireless communication unit includes at least one of WiFi units, bluetooth unit, NFC unit or ZigBee units.
Step S909, judge whether zero cross signal is normal.
The above embodiment of the present invention, after alarm signal is sent, judging the duration T 1 of the CHECK signals is
It is no to be more than or equal to predetermined threshold value t1.If the judgment is Yes, then send and switch off signal to the power switch；If it is determined that
It is no, power-off restoration.Circuit problem caused by judging investigation temperature limiter exceptional reset situation by third time, increase temperature limiter failure
Processing mode afterwards so that circuit work is more safe and reliable.
Step S910, power switch disconnect.
Judge that temperature limiter whether there is exceptional reset, if exceptional reset be present, then MCU units are to power switch TR1
HEAT signals (now HEAT signal definitions are to switch off signal) are sent, power switch TR1 disconnects according to signal is switched off.
Due to temperature limiter exceptional reset, heater members HEATER is caused to remain in continuous heating working condition, for further protection electricity
Road, by software logic complete machine can be controlled to power off, so as to protect heater element, lift the security of circuit.
If the judgment is No, then it represents that circuit does not have temperature limiter exceptional reset, then complete machine passes through power-off restoration.
By above-described embodiment, send different drive signals using the judgement triggering micro-control unit of zero cross signal and control
Power switch discontinuous or continuous firing, it is achieved thereby that the multiplexing of power switch.By repeatedly judging that zero cross signal is investigated
The exception of temperature limiter induced fault, and in the case where abnormal failure occurs in temperature limiter, by software complete machine can be controlled to power off
Reset, further increase the security of heating utensil.
For those of ordinary skill in the art it is easily understood that on the premise of not conflicting, above-mentioned each preferred embodiment can be with
Freely combine, be superimposed.
It should be appreciated that above-mentioned embodiment is only illustrative, and not restrictive, without departing from the basic of the present invention
In the case of principle, those of ordinary skill in the art can be directed to the various obvious or equivalent modification made of above-mentioned details or
Replace, be all included in scope of the presently claimed invention.
Claims (18)
1. a kind of power control circuit based on zero passage detection, including micro-control unit and heater element, it is characterised in that described
Circuit also includes：
Power-off restoration temperature limiter, its both ends connect live wire and heater element respectively, and the power-off restoration temperature limiter is by temperature in parallel
Degree switch and PTC resistor composition；
Power switch, zero line, heater element and the micro-control unit are connected respectively；
Zero cross detection circuit, its input connect the heater element and the power-off restoration temperature limiter respectively, and its output end connects
The micro-control unit is connect, the zero cross detection circuit is used to detect zero cross signal CHECK and is supplied to micro-control unit；
Micro-control unit, judges whether the duration T 1 of the zero cross signal is more than or equal to predetermined threshold value t1, if NO, then
Sending switch closure signals controls the power switch persistently to close.
2. circuit as claimed in claim 1, it is characterised in that the micro-control unit, sending switch closure signals control
After the power switch persistently closes, judge the zero cross signal and the zero cross signal whether are detected in scheduled duration
Whether duration T 2 is more than or equal to predetermined threshold value t2；Wherein, if the zero cross signal and described in scheduled duration be present
Zero cross signal duration T 2 is more than or equal to t2, then sends switching drive signal and control the power switch interruption closure.
3. circuit as claimed in claim 1, it is characterised in that the micro-control unit, judge continuing for the zero cross signal
Whether time T1 is more than or equal to predetermined threshold value t1, controls the power switch interruption to close if it is, sending switching drive signal
Close.
4. circuit as claimed in claim 3, it is characterised in that the micro-control unit is at alternating current zero passage to the power
Switch sends the drive signal of interruption closure.
5. circuit as claimed in claim 1, it is characterised in that also including alarm unit, the micro-control unit, opened in transmission
After the pass closure signal control power switch persistently closes, judge the zero cross signal whether is detected in scheduled duration
And whether the zero cross signal duration T 2 is more than or equal to predetermined threshold value t2；Wherein, if institute in scheduled duration be present
Zero cross signal is stated, or the zero cross signal be present in scheduled duration and the zero cross signal duration T 2 is less than default threshold
Value t2, then alarm signal is sent to alarm unit.
6. circuit as claimed in claim 5, it is characterised in that the micro-control unit, after alarm signal is sent, judge
Whether the duration T 1 of the zero cross signal is more than or equal to predetermined threshold value t1, if YES, then sends and switches off signal extremely
The power switch.
7. circuit as claimed in claim 6, it is characterised in that the micro-control unit, after power switch disconnection,
Perform power-off restoration.
8. circuit as claimed in claim 5, it is characterised in that the micro-control unit, after alarm signal is sent, judge
Whether the duration T 1 of the zero cross signal is more than or equal to predetermined threshold value t1, if NO, then sends the lasting closure letter of switch
Number to the power switch.
9. the circuit as described in any one in claim 1-8, it is characterised in that it is disconnected that the control circuit also includes hot melt
Body, the thermal fuse-link are connected between the zero line and the power switch.
10. circuit as claimed in claim 9, it is characterised in that power-off restoration temperature limiter, thermal fuse-link and the heating element
Part is arranged on same heater members support.
A kind of 11. Power Control side of power control circuit based on zero passage detection applied to described in one of claim 1-10
Method, it is characterised in that the Poewr control method includes：
Judge whether the duration T 1 of the zero cross signal is more than or equal to predetermined threshold value t1, if NO, then send switch and close
Closing signal controls the power switch persistently to close.
12. method as claimed in claim 11, it is characterised in that control the power switch to hold sending switch closure signals
After continuous closure, judge whether to detect whether are the zero cross signal and the zero cross signal duration T 2 in scheduled duration
More than or equal to predetermined threshold value t2, if the zero cross signal in scheduled duration be present and the zero cross signal duration T 2 is big
In equal to t2, then send switching drive signal and control the power switch interruption closure.
13. method as claimed in claim 11, it is characterised in that judge whether the duration T 1 of the zero cross signal is more than
Equal to predetermined threshold value t1, if it is, sending switching drive signal controls the power switch interruption closure.
14. method as claimed in claim 13, it is characterised in that the micro-control unit is at alternating current zero passage to the work(
Rate switch sends the drive signal of interruption closure.
15. method as claimed in claim 11, it is characterised in that control the power switch to hold sending switch closure signals
After continuous closure, judge whether to detect whether are the zero cross signal and the zero cross signal duration T 2 in scheduled duration
More than or equal to predetermined threshold value t2, if the zero cross signal in scheduled duration be present, or institute in scheduled duration be present
State zero cross signal and the zero cross signal duration T 2 is less than predetermined threshold value t2, then send alarm signal to alarm unit.
16. method as claimed in claim 15, it is characterised in that after alarm signal is sent, judge the zero cross signal
Duration T 1 whether be more than or equal to predetermined threshold value t1, if YES, then send switch off signal to the power switch.
17. method as claimed in claim 16, it is characterised in that after power switch disconnection, perform power-off restoration.
18. method as claimed in claim 15, it is characterised in that after alarm signal is sent, judge the zero cross signal
Duration T 1 whether be more than or equal to predetermined threshold value t1, if NO, then send switch and continue closure signal to the power
Switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710671513.9A CN107436577B (en) | 2017-08-08 | 2017-08-08 | Power control circuit and method based on zero-crossing detection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710671513.9A CN107436577B (en) | 2017-08-08 | 2017-08-08 | Power control circuit and method based on zero-crossing detection |
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| CN107436577A true CN107436577A (en) | 2017-12-05 |
| CN107436577B CN107436577B (en) | 2023-05-23 |
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| JP2007178079A (en) * | 2005-12-28 | 2007-07-12 | Matsushita Electric Ind Co Ltd | Refrigerator control device |
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| CN106444890A (en) * | 2016-09-08 | 2017-02-22 | 珠海格力电器股份有限公司 | Power control circuit based on zero-crossing detection, power control method and temperature control switch state detection method |
| CN106681397A (en) * | 2017-02-22 | 2017-05-17 | 美的集团股份有限公司 | Electrical equipment and PTC (positive temperature coefficient) electric heater control circuit therefor |
| CN207851544U (en) * | 2017-08-08 | 2018-09-11 | 珠海格力电器股份有限公司 | Power control circuit based on zero-crossing detection |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5802421A (en) * | 1994-08-26 | 1998-09-01 | Canon Kabushiki Kaisha | Heating and fixing device with AC zero-cross detection circuit |
| JPH10117484A (en) * | 1996-10-08 | 1998-05-06 | Oki Electric Ind Co Ltd | Ac uninterruptive power circuit normally supplied with commercial power |
| JP2007178079A (en) * | 2005-12-28 | 2007-07-12 | Matsushita Electric Ind Co Ltd | Refrigerator control device |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN107436577B (en) | 2023-05-23 |
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