CN108076543A - Electromagnetic heating system and its zero crossing detection device and method - Google Patents
Electromagnetic heating system and its zero crossing detection device and method Download PDFInfo
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- CN108076543A CN108076543A CN201611036024.8A CN201611036024A CN108076543A CN 108076543 A CN108076543 A CN 108076543A CN 201611036024 A CN201611036024 A CN 201611036024A CN 108076543 A CN108076543 A CN 108076543A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
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Abstract
The invention discloses a kind of electromagnetic heating system and its zero crossing detection device and method, device includes：The voltage detection module being connected with power supply is detected to generate first voltage detection signal for the voltage to power supply；Reference voltage provides module, for providing adjustable reference voltage；The control module that module is connected is provided with voltage detection module and reference voltage respectively, for detecting the reference voltage of signal adjustment reference voltage offer module offer according to first voltage；The zero passage detection module that module is connected is provided respectively with power supply and reference voltage, it is detected to generate second voltage detection signal for the voltage to power supply, and the reference voltage that signal and reference voltage offer module offer are detected according to second voltage generates zero cross signal, so as to control zero cross signal in rational scope, it avoids zero cross signal and the deviation actually crossed between zero crossing excessive or too small, prevents from causing machine system chaotic.
Description
Technical field
The present invention relates to technical field of electric appliances, more particularly to a kind of zero crossing detection device of electromagnetic heating system, Yi Zhong electricity
A kind of zero passage detection method of magnetic heating system and electromagnetic heating system.
Background technology
In the related art, generally use comparator type carries out voltage zero-cross judgement.Specifically, as shown in Figure 1, than
Compared with the reference level Vref of level and the inverting input of the noninverting input of device ' between when differing predetermined threshold value, comparator is just
It can overturn, that is, export high level or low level.
But correlation technique there are the problem of be reference level Vref ' be fixed value, it is difficult to rationally set to meet not
Same operating mode.Such as in the unstable area of supply voltage, supply voltage may be too low, such as down to below 150V, at this time such as Fig. 2
It is shown, since the level of the noninverting input of comparator will be substantially less that reference level Vref ', it is lost so as to be easy to cause zero cross signal
It loses, causes machine system chaotic；For another example, in some particular applications, it is necessary to zero cross signal in advance actual zero crossing 1~
2MS, if at this time as shown in figure 3, supply voltage is excessively high, reference level Vref ' close to zero crossing, and then cause zero cross signal
Close to real zero crossing, it can equally cause machine system chaotic.
The content of the invention
It is contemplated that it solves at least some of the technical problems in related technologies.For this purpose, the present invention
One purpose is to propose a kind of zero crossing detection device of electromagnetic heating system, and this method can control zero cross signal reasonable
In the range of, it avoids excessive or too small.
It is another object of the present invention to propose a kind of electromagnetic heating system.A further object of the present invention is to propose
A kind of zero passage detection method of electromagnetic heating system.
In order to achieve the above objectives, one aspect of the present invention embodiment proposes a kind of zero passage detection dress of electromagnetic heating system
It puts, including：Voltage detection module, the voltage detection module are connected with power supply, and the voltage detection module is used for institute
The voltage for stating power supply is detected to generate first voltage detection signal；Reference voltage provides module, the reference voltage
Module is provided for providing adjustable reference voltage；Control module, the control module respectively with the voltage detection module and
The reference voltage provides module and is connected, and the control module is used to detect the signal adjustment reference according to the first voltage
Voltage provides the reference voltage that module provides；Zero passage detection module, the zero passage detection module respectively with the power supply and
The reference voltage provides module and is connected, and the zero passage detection module is used to be detected with life the voltage of the power supply
Signal is detected into second voltage, and the reference of signal and reference voltage offer module offer is provided according to the second voltage
Voltage generates zero cross signal.
The zero crossing detection device of the electromagnetic heating system proposed according to embodiments of the present invention, by voltage detection module to supplying
The voltage of power supply is detected to generate first voltage detection signal, and then control module detects signal tune according to first voltage
Whole reference voltage provides the reference voltage that module provides, and then zero passage detection module is detected with life the voltage of power supply
Signal is detected into second voltage, and the reference voltage generation of signal and reference voltage offer module offer is provided according to second voltage
Zero cross signal.The embodiment of the present invention can set rational reference voltage according to supply voltage as a result, so as to by zero cross signal control
System avoids zero cross signal and the deviation actually crossed between zero crossing excessive or too small, prevents from causing machine in rational scope
System perturbations, lifting system reliability.
According to one embodiment of present invention, when the control module is according to the first voltage detects signal judgement
When the voltage of power supply is in predetermined voltage range, the reference voltage is controlled to provide module, the first reference voltage is provided；When
The control module detects signal according to the first voltage and judges that the voltage of the power supply exceeds the predeterminated voltage model
During the upper limit value enclosed, the reference voltage is controlled to provide module, the second reference voltage is provided, wherein, second reference voltage is big
In first reference voltage；Judge the electricity of the power supply when the control module detects signal according to the first voltage
It forces down when the lower limiting value of the predetermined voltage range, the reference voltage is controlled to provide module, the 3rd reference voltage is provided,
In, the 3rd reference voltage is less than first reference voltage.
According to one embodiment of present invention, the reference voltage provides module and includes：The first resistor of series connection and second
Resistance, one end of the first resistor are connected with default power supply, and one end of the second resistance is another with the first resistor
End is connected, and the other end ground connection of the second resistance has first node, institute between the first resistor and the second resistance
First node is stated with the zero passage detection module to be connected；3rd resistor, one end of the 3rd resistor and the control module phase
Even, the other end of the 3rd resistor is connected with the first node.
According to one embodiment of present invention, the zero passage detection module includes：Voltage detection unit, the voltage detecting
Unit is used to that the voltage of the power supply to be detected to generate second voltage detection signal；Comparing unit, the comparison
Unit is used to detect signal according to the second voltage and the reference voltage provides the reference voltage generation zero passage of module offer
Signal.
According to one embodiment of present invention, the voltage detection unit includes：Rectification subelement, the rectification subelement
Input terminal be connected with the power supply, the rectification subelement be used for the power supply provide alternating current carry out it is whole
Stream；Divide subelement, it is described partial pressure subelement be connected with the output terminal of the rectification subelement, it is described partial pressure subelement be used for pair
Alternating current after rectification is divided to generate the second voltage detection signal.
Wherein, the rectification subelement includes：First diode, anode and the power supply of first diode
First end be connected；Second diode, the anode of second diode are connected with the second end of the power supply, and described
The cathode of two diodes is connected with the cathode of first diode and has a section point, the section point and the partial pressure
Subelement is connected.
Wherein, the partial pressure subelement includes：Series connection the 4th resistance and the 5th resistance, one end of the 4th resistance with
The output terminal of the rectification subelement is connected, and one end of the 5th resistance is connected with the other end of the 4th resistance, described
The other end ground connection of 5th resistance, has the 3rd node between the 4th resistance and the 5th resistance；6th resistance, it is described
One end of 6th resistance is connected with the 3rd node, and the other end of the 6th resistance is connected with the comparing unit；First
Capacitance, one end of first capacitance are connected with the 3rd node, the other end ground connection of first capacitance.
According to one embodiment of present invention, the comparing unit includes：Comparator, the positive input terminal of the comparator with
The voltage detection unit is connected, and the negative input end of the comparator provides module with the reference voltage and is connected, the comparison
The output terminal of device is used to export the zero cross signal；3rd diode, anode and the comparator of the 3rd diode
Positive input terminal is connected, and the cathode of the 3rd diode is connected with default power supply；7th resistance, one end of the 7th resistance with
The output terminal of the comparator is connected, and the other end of the 7th resistance is connected with the default power supply.
In order to achieve the above objectives, another aspect of the present invention embodiment proposes a kind of electromagnetic heating system, including described
The zero crossing detection device of electromagnetic heating system.
The electromagnetic heating system proposed according to embodiments of the present invention is filled by the zero passage detection of above-mentioned electromagnetic heating system
It puts, can rational reference voltage be set according to supply voltage, so as to which zero cross signal control in rational scope, be avoided
The deviation that zero-signal and reality are crossed between zero crossing is excessive or too small, prevents from causing machine system chaotic, lifting system reliability.
In order to achieve the above objectives, another aspect of the invention embodiment proposes a kind of zero passage detection side of electromagnetic heating system
Method comprises the following steps：The voltage of the power supply of the electromagnetic heating system is detected to generate first voltage detection signal；Root
Reference voltage in the electromagnetic heating system is adjusted according to first voltage detection signal, and the reference voltage that module provides is provided；It is right
The voltage of the power supply is detected to generate second voltage detection signal, and according to the second voltage detect signal and
The reference voltage provides the reference voltage generation zero cross signal that module provides.
The zero passage detection method of the electromagnetic heating system proposed according to embodiments of the present invention, first to the voltage of power supply into
Then row detection provides module according to first voltage detection signal adjustment reference voltage and provides to generate first voltage detection signal
Reference voltage, and then be detected to generate second voltage detection signal to the voltage of power supply, and according to second voltage
It detects signal and reference voltage provides the reference voltage generation zero cross signal that module provides.The embodiment of the present invention being capable of root as a result,
According to supply voltage, rational reference voltage is set, so as to zero cross signal control in rational scope, is avoided zero cross signal with
The deviation that reality is crossed between zero crossing is excessive or too small, prevents from causing machine system chaotic, lifting system reliability.
According to one embodiment of present invention, when the electricity that the power supply is judged according to first voltage detection signal
When pressure is in predetermined voltage range, the reference voltage is controlled to provide module, the first reference voltage is provided；When according to described first
When voltage detection signal judges that the voltage of the power supply exceeds the upper limit value of the predetermined voltage range, the reference is controlled
Voltage provides module and provides the second reference voltage, wherein, second reference voltage is more than first reference voltage；Work as basis
When the first voltage detection signal judges that the voltage of the power supply is less than the lower limiting value of the predetermined voltage range, control
The reference voltage provides module and provides the 3rd reference voltage, wherein, the 3rd reference voltage is less than described first with reference to electricity
Pressure.
Description of the drawings
Fig. 1 is the waveform diagram of zero cross signal in normal voltage range in correlation technique；
The waveform diagram of zero cross signal when Fig. 2 is correlation technique mesolow；
The waveform diagram of zero cross signal when Fig. 3 is correlation technique mesohigh；
Fig. 4 is the block diagram of the zero crossing detection device of electromagnetic heating system according to embodiments of the present invention；
Fig. 5 is zero passage letter of the zero crossing detection device of electromagnetic heating system according to an embodiment of the invention in low pressure
Number waveform diagram；
Fig. 6 is the circuit diagram of the zero crossing detection device of electromagnetic heating system according to an embodiment of the invention；With
And
Fig. 7 is the flow chart of the zero passage detection method of electromagnetic heating system according to embodiments of the present invention.
Reference numeral：
Power supply 200, voltage detection module 11, reference voltage provide module 12, control module 13 and zero passage detection mould
Block 14；
First resistor R1, second resistance R2 and 3rd resistor R3；
Voltage detection unit 401, comparing unit 402, rectification subelement 4011 and partial pressure subelement 4012；First diode
D1, the second diode D2, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the first capacitance C1, comparator CMP, the three or two
Pole pipe D3 and the 7th resistance R7.
Specific embodiment
The embodiment of the present invention is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or has the function of same or like element.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
Below with reference to the accompanying drawings add to describe zero crossing detection device, the electromagnetism of the electromagnetic heating system of proposition of the embodiment of the present invention
The zero passage detection method of hot systems and electromagnetic heating system.
Fig. 4 is the block diagram of the zero crossing detection device of electromagnetic heating system according to embodiments of the present invention.Such as Fig. 4 institutes
Show, the zero crossing detection device of electromagnetic heating system includes：Voltage detection module 11, reference voltage provide module 12, control module
13 and zero passage detection module 14.
Wherein, voltage detection module 11 is connected with power supply 200, and voltage detection module 11 is used for power supply 200
Voltage be detected to generate first voltage detection signal.Specifically, power supply 200 can provide for electromagnetic heating system
Alternating current such as 220V alternating currents, voltage detection module 11 can to power supply 200 provide alternating current effective voltage value or
The voltage parameters such as voltage magnitude are detected.
Reference voltage provides module 12 for providing adjustable reference voltage Vref；Control module 13 respectively with voltage detecting
Module 11 provides module 12 with reference voltage and is connected, and control module 13 is used to detect signal adjustment reference voltage according to first voltage
The reference voltage Vref that module 12 provides is provided.That is, the reference voltage Vref that reference voltage provides the offer of module 12 is
It is adjustable, also, can be adjusted by control module 13 according to the voltage of power supply 200, so as to prevent reference voltage
Vref sets unreasonable caused zero cross signal detection unreasonable.
Zero passage detection module 14 provides module 12 with power supply 200 and reference voltage respectively and is connected, zero passage detection module
14 are used to that the voltage of power supply 200 to be detected to generate second voltage detection signal, and are detected and believed according to second voltage
Number and reference voltage provide module 12 provide reference voltage generation zero cross signal.Zero passage detection module 14 can be by the zero cross signal
Output is to control module 13, so that control module 13 controls electromagnetic heating system according to zero cross signal.
That is, second voltage can be detected signal compared with reference voltage Vref by zero passage detection module 14, such as
The voltage of fruit second voltage detection signal is more than reference voltage Vref, and zero passage detection module 14 then judges the electricity of power supply 200
For pressure not close to zero crossing, zero passage detection module 14 does not export zero cross signal；If second voltage detection signal voltage be less than or
Equal to reference voltage Vref, zero passage detection module 14 then judges the voltage of power supply 200 close to zero crossing, zero passage detection module
14 output zero cross signals.Wherein, zero cross signal can be high level or low level.
Specifically, reference voltage provide module 12 can provide the first reference voltage Vref 1, the second reference voltage Vref 2 or
3rd reference voltage Vref 3, wherein, the second reference voltage Vref 2 is more than the first reference voltage Vref 1, and the 3rd reference voltage
Vref3 is less than the first reference voltage Vref 1.
Judge that the voltage of power supply 200 is in predetermined voltage range when control module 13 detects signal according to first voltage
When, control reference voltage provides module 12 and provides the first reference voltage Vref 1；Believe when control module 13 is detected according to first voltage
When number judging that the voltage of power supply 200 exceeds the upper limit value of predetermined voltage range, control reference voltage provides module 12 and provides
Second reference voltage Vref 2, wherein, the second reference voltage Vref 2 is more than the first reference voltage Vref 1；When control module 13
When judging that the voltage of power supply 200 is less than the lower limiting value of predetermined voltage range according to first voltage detection signal, control is with reference to electricity
Pressure provides module 12 and provides the 3rd reference voltage Vref 3, wherein, the 3rd reference voltage Vref 3 is less than the first reference voltage
Vref1。
That is, judge that the voltage of power supply 200 is in pre- when control module 13 detects signal according to first voltage
If during voltage range such as [160,240], reference voltage provides module 12 and provides the first reference voltage Vref 1, and then mistake
The zero cross signal of zero detection module 14 output just can be in the reasonable scope；When the voltage of power supply 200 exceeds predeterminated voltage model
When the upper limit value enclosed is greater than 240, the first reference voltage Vref 1 is relatively close to actual zero crossing, need to heighten reference voltage and carry
For reference voltage Vref i.e. the second reference voltage Vref 2 that module 12 provides, and then the zero passage that zero passage detection module 14 exports is believed
It number also can be in the reasonable scope, it is ensured that there are certain deviations between zero cross signal and actual zero crossing；When power supply 200
When voltage is, for example, less than 160 less than the lower limiting value of predetermined voltage range, there is the possibility that can't detect zero crossing, reference need to be turned down
Reference voltage Vref i.e. the 3rd reference voltage Vref 3 that voltage offer module 12 provides, and then the output of zero passage detection module 14
Zero cross signal also can avoid zero cross signal from losing in the reasonable scope.
Specifically, as shown in figure 5, when the voltage of power supply 200 is in low pressure, control module 13 controls reference voltage
Module 12 is provided, the 3rd reference voltage Vref 3 is provided, the waveform of the output signal of zero passage detection module 14 is as shown in figure 5, and Fig. 2
It compares, the embodiment of the present invention can be good at voltage zero-crossing signal control in rational scope, and zero cross signal is avoided to lose
The appearance of situation.
The circuit structure of the zero crossing detection device 100 of the embodiment of the present invention is described in detail with reference to Fig. 6.
According to one embodiment of present invention, reference voltage provides module 12 and includes：First resistor R1, second resistance R2 and
3rd resistor R3.
Wherein, first resistor R1 and second resistance R2 series connection, one end of first resistor R1 are connected with default power vd D, the
One end of two resistance R2 is connected with the other end of first resistor R1, the other end of second resistance R2 ground connection, first resistor R1 and the
There is first node, first node is connected with zero passage detection module 14 between two resistance R2；One end of 3rd resistor R3 and control
The port K1 of module 13 is connected, and the other end of 3rd resistor R3 is connected with first node.
Specifically, control module 13 is according to the voltage of power supply 200, and three states for passing through port K1 input
High-impedance state, output low level export high level to change the level value of reference voltage Vref.Specifically, when port K1 is in defeated
When entering high-impedance state, port K1 is equivalent to open circuit, and the reference voltage Vref that reference voltage provides that module 12 provides at this time is the first ginseng
Examine voltage Vref1, i.e. Vref1=VDD*R2/ (R1+R2)；When port K1 is in output low level, port K1 is equivalent to short circuit
To ground, the reference voltage Vref that the module 12 of reference voltage offer at this time provides is adjusted to the 3rd reference voltage Vref 3, i.e.,
Vref3=VDD* (R2//R3)/(R1+R2//R3)；When port K1 be in output high level when, port K1 be equivalent to be shorted to it is pre-
If power vd D, reference voltage provides the reference voltage Vref that module 12 provides and is adjusted to the second reference voltage Vref 2 at this time,
That is Vref2=VDD*R2/ (R1//R3+R2).
Wherein, VDD is the voltage of default power vd D, and R3 is the resistance value of 3rd resistor R3, and R2 is the resistance of second resistance R2
Value, R1 are the resistance value of first resistor R1, and R2//R3 is the second resistance R2 resistance value in parallel with 3rd resistor R3, i.e. R2*R3/ (R2+
R3), R1//R3 is the first resistor R1 resistance value in parallel with 3rd resistor R3, i.e. R1*R3/ (R1+R3).
More specifically, the resistance value of resistance value, second resistance R2 and the resistance value of first resistor R1 as 3rd resistor R3 are equal,
That is during R1=R2=R3, the actual ginseng of the first reference voltage Vref 1, the second reference voltage Vref 2 and the 3rd reference voltage Vref 3
It is as shown in table 1 below to examine voltage value, i.e. Vref1=1/2VDD, Vref2=2/3VDD, Vref3=1/3VDD.
Table 1
| K1 states | Vref | Reference voltage level |
| Input high-impedance state | Vref1 | 1/2VDD |
| Export low level | Vref3 | 1/3VDD |
| Export high level | Vref2 | 2/3VDD |
According to one embodiment of present invention, as shown in fig. 6, zero passage detection module 14 includes：401 He of voltage detection unit
Comparing unit 402.
Wherein, voltage detection unit 401 is used to that the voltage of power supply 200 to be detected to generate second voltage detection
Signal；Comparing unit 402 is used to detect signal according to second voltage and reference voltage provides the reference voltage life of the offer of module 12
Into zero cross signal.
Specifically, as shown in fig. 6, voltage detection unit 401 includes：Rectification subelement 4011 and partial pressure subelement 4012.
Wherein, the input terminal of rectification subelement 4011 is connected with power supply 200, and rectification subelement 4011 is used for power supply
The alternating current that power supply 200 provides carries out rectification.More specifically, rectification subelement 4011 includes：First diode D1 and the two or two
Pole pipe D2, the anode of the first diode D1 are connected with the first end L of power supply 200；The anode of second diode D2 and power supply
The second end N of power supply 200 is connected, and the cathode of the second diode D2 is connected with the cathode of the first diode D1 and has second to save
Point, section point are connected with partial pressure subelement 4012.First diode D1 and the second diode D2 is rectifier diode.
Partial pressure subelement 4012 is connected with output terminal, that is, section point of rectification subelement 4011, and partial pressure subelement 4012 is used
In being divided to generate second voltage detection signal to the alternating current after rectification.More specifically, partial pressure subelement 4012 includes：
4th resistance R4, the 5th resistance R5, the 6th resistance R6 and the first capacitance C1, the 4th resistance R4 and the 5th resistance R5 series connection, the 4th
One end of resistance R4 is connected with output terminal, that is, section point of rectification subelement 4011, one end and the 4th resistance of the 5th resistance R5
The other end of R4 is connected, and the other end ground connection of the 5th resistance R5 has the 3rd node between the 4th resistance R4 and the 5th resistance R5,
4th resistance R4 and the 5th resistance R5 is used to divide the alternating current after rectification；One end of 6th resistance R6 and the 3rd node
It is connected, the other end of the 6th resistance R6 is connected with comparing unit 402；One end of first capacitance C1 is connected with the 3rd node, and first
The other end ground connection of capacitance C1.
Specifically, as shown in fig. 6, comparing unit 402 includes：Comparator CMP, the 3rd diode D3 and the 7th resistance R7.
Wherein, the positive input terminal of comparator CMP is connected with the other end that voltage detection unit 41 is the 6th resistance R6, compares
It is that first node is connected that the negative input end of device CMP provides module 12 with reference voltage, and the output terminal CMP_OUT of comparator CMP is used
In output zero cross signal, the output terminal CMP_OUT of comparator CMP can be connected with control module 13, by zero cross signal export to
Control module 13；The anode of 3rd diode D3 is connected with the positive input terminal of comparator CMP, the cathode of the 3rd diode D3 with it is pre-
If power vd D is connected, the 3rd diode D3 is clamp diode；One end of 7th resistance R7 and the output terminal phase of comparator CMP
Even, the other end of the 7th resistance R7 is connected with default power vd D, and the 7th resistance R7 is pull-up resistor.
To sum up, the zero crossing detection device of the electromagnetic heating system proposed according to embodiments of the present invention passes through voltage detecting mould
Block is detected the voltage of power supply to generate first voltage detection signal, and then control module is detected according to first voltage
Signal adjustment reference voltage provides the reference voltage that module provides, and then zero passage detection module examines the voltage of power supply
It surveys to generate second voltage detection signal, and signal and the reference electricity of reference voltage offer module offer is detected according to second voltage
Pressure generation zero cross signal.The embodiment of the present invention can set rational reference voltage according to supply voltage as a result, so as to by zero passage
Signal is controlled in rational scope, is avoided zero cross signal and the deviation actually crossed between zero crossing excessive or too small, is prevented from drawing
It is chaotic to play machine system, lifting system reliability.
The embodiment of the present invention also proposed a kind of electromagnetic heating system, the mistake of the electromagnetic heating system including above-described embodiment
Zero detection device.
The electromagnetic heating system proposed according to embodiments of the present invention, can be according to supply voltage by zero crossing detection device
Rational reference voltage is set, so as in rational scope, zero cross signal be avoided to cross zero passage with actual zero cross signal control
Deviation between point is excessive or too small, prevents from causing machine system chaotic, lifting system reliability.
Fig. 7 is the flow chart of the zero passage detection method of electromagnetic heating system according to embodiments of the present invention.As shown in fig. 7,
This method comprises the following steps：
S1：The voltage of the power supply of electromagnetic heating system is detected to generate first voltage detection signal.
S2：Reference voltage in signal adjustment electromagnetic heating system is detected according to first voltage, the reference electricity that module provides is provided
Pressure.
S3：The voltage of power supply is detected to generate second voltage detection signal, and is detected according to second voltage
Signal and reference voltage provide the reference voltage generation zero cross signal that module provides.
Specifically, according to one embodiment of present invention, when the electricity that power supply is judged according to first voltage detection signal
When pressure is in predetermined voltage range, control reference voltage provides module and provides the first reference voltage；It is detected when according to first voltage
When signal judges that the voltage of power supply exceeds the upper limit value of predetermined voltage range, control reference voltage provides module and provides second
Reference voltage, wherein, the second reference voltage is more than the first reference voltage；Judge power supply when detecting signal according to first voltage
Voltage when being less than the lower limiting value of predetermined voltage range, control reference voltage provides module and provides the 3rd reference voltage, wherein, the
Three reference voltages are less than the first reference voltage.
To sum up, the zero passage detection method of the electromagnetic heating system proposed according to embodiments of the present invention, first to power supply
Voltage is detected to generate first voltage detection signal, and then detecting signal adjustment reference voltage according to first voltage provides mould
The reference voltage that block provides, and then be detected to generate second voltage detection signal to the voltage of power supply, and according to the
Two voltage detection signals and reference voltage provide the reference voltage generation zero cross signal that module provides.The embodiment of the present invention as a result,
Can rational reference voltage be set according to supply voltage, so as to which in rational scope, zero cross signal control is avoided zero passage
The deviation that signal and reality are crossed between zero crossing is excessive or too small, prevents from causing machine system chaotic, lifting system reliability.
In the description of the present invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outer ", " up time
The orientation or position relationship of the instructions such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be based on orientation shown in the drawings or
Position relationship is for only for ease of the description present invention and simplifies description rather than instruction or imply that signified device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for description purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating 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, " multiple " are meant that at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integral；Can be that machinery connects
It connects or is electrically connected；It can be directly connected, can also be indirectly connected by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature can be with "above" or "below" second feature
It is that the first and second features contact directly or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward or is merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment of the present invention or example.In the present specification, schematic expression of the above terms is not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It is combined in an appropriate manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the different embodiments described in this specification or example and different embodiments or exemplary feature
It closes and combines.
Although the embodiment of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, those of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (11)
1. a kind of zero crossing detection device of electromagnetic heating system, which is characterized in that including：
Voltage detection module, the voltage detection module are connected with power supply, and the voltage detection module is used for the confession
The voltage of power supply is detected to generate first voltage detection signal；
Reference voltage provides module, and the reference voltage provides module for providing adjustable reference voltage；
Control module, the control module provide module with the voltage detection module and the reference voltage respectively and are connected, institute
Control module is stated for detecting the reference voltage of the signal adjustment reference voltage offer module offer according to the first voltage；
Zero passage detection module, the zero passage detection module provide module phase with the power supply and the reference voltage respectively
Even, the zero passage detection module is used to that the voltage of the power supply to be detected to generate second voltage detection signal, and
Signal is detected according to the second voltage and the reference voltage provides the reference voltage generation zero cross signal of module offer.
2. the zero crossing detection device of electromagnetic heating system according to claim 1, which is characterized in that
Judge that the voltage of the power supply is in predeterminated voltage when the control module detects signal according to the first voltage
During scope, the reference voltage is controlled to provide module, the first reference voltage is provided；
Judge the voltage of the power supply beyond described default when the control module detects signal according to the first voltage
During the upper limit value of voltage range, the reference voltage is controlled to provide module, the second reference voltage is provided, wherein, second reference
Voltage is more than first reference voltage；
Judge that the voltage of the power supply is default less than described when the control module detects signal according to the first voltage
During the lower limiting value of voltage range, the reference voltage is controlled to provide module, the 3rd reference voltage is provided, wherein, the 3rd reference
Voltage is less than first reference voltage.
3. the zero crossing detection device of electromagnetic heating system according to claim 1 or 2, which is characterized in that described with reference to electricity
Pressure, which provides module, to be included：
The first resistor and second resistance of series connection, one end of the first resistor are connected with default power supply, the second resistance
One end is connected with the other end of the first resistor, the other end of second resistance ground connection, the first resistor and described the
There is first node, the first node is connected with the zero passage detection module between two resistance；
3rd resistor, one end of the 3rd resistor are connected with the control module, the other end of the 3rd resistor with it is described
First node is connected.
4. the zero crossing detection device of electromagnetic heating system according to claim 1, which is characterized in that the zero passage detection mould
Block includes：
Voltage detection unit, the voltage detection unit are electric with generation second for being detected to the voltage of the power supply
Pressure detection signal；
Comparing unit, the comparing unit is used to detect signal according to the second voltage and the reference voltage provides module and carries
The reference voltage generation zero cross signal of confession.
5. the zero crossing detection device of electromagnetic heating system according to claim 4, which is characterized in that the voltage detecting list
Member includes：
Rectification subelement, the input terminal of the rectification subelement are connected with the power supply, the rectification subelement for pair
The alternating current that the power supply provides carries out rectification；
Subelement is divided, the partial pressure subelement is connected with the output terminal of the rectification subelement, and the partial pressure subelement is used for
Alternating current after rectification is divided to generate the second voltage detection signal.
6. the zero crossing detection device of electromagnetic heating system according to claim 5, which is characterized in that the rectification subelement
Including：
First diode, the anode of first diode are connected with the first end of the power supply；
Second diode, the anode of second diode are connected with the second end of the power supply, second diode
Cathode be connected with the cathode of first diode and there is section point, the section point and the partial pressure subelement phase
Even.
7. the zero crossing detection device of electromagnetic heating system according to claim 5, which is characterized in that the partial pressure subelement
Including：
The 4th resistance and the 5th resistance of series connection, one end of the 4th resistance are connected with the output terminal of the rectification subelement,
One end of 5th resistance is connected with the other end of the 4th resistance, the other end of the 5th resistance ground connection, and described the
There is the 3rd node between four resistance and the 5th resistance；
6th resistance, one end of the 6th resistance are connected with the 3rd node, the other end of the 6th resistance with it is described
Comparing unit is connected；
First capacitance, one end of first capacitance are connected with the 3rd node, the other end ground connection of first capacitance.
8. the zero crossing detection device of electromagnetic heating system according to claim 4, which is characterized in that the comparing unit bag
It includes：
Comparator, the positive input terminal of the comparator are connected with the voltage detection unit, the negative input end of the comparator with
The reference voltage provides module and is connected, and the output terminal of the comparator is used to export the zero cross signal；
3rd diode, the anode of the 3rd diode are connected with the positive input terminal of the comparator, the 3rd diode
Cathode be connected with default power supply；
7th resistance, one end of the 7th resistance are connected with the output terminal of the comparator, the other end of the 7th resistance
It is connected with the default power supply.
9. a kind of electromagnetic heating system, which is characterized in that including the electromagnetic heating system according to any one of claim 1-8
The zero crossing detection device of system.
10. a kind of zero passage detection method of electromagnetic heating system, which is characterized in that comprise the following steps：
The voltage of the power supply of the electromagnetic heating system is detected to generate first voltage detection signal；
Signal is detected according to the first voltage and adjusts the reference that reference voltage offer module provides in the electromagnetic heating system
Voltage；
The voltage of the power supply is detected to generate second voltage detection signal, and is detected according to the second voltage
Signal and the reference voltage provide the reference voltage generation zero cross signal that module provides.
11. the zero passage detection method of electromagnetic heating system according to claim 10, which is characterized in that
When judging that the voltage of the power supply is in predetermined voltage range according to first voltage detection signal, institute is controlled
It states reference voltage and module the first reference voltage of offer is provided；
Judge the voltage of the power supply beyond the upper of the predetermined voltage range when detecting signal according to the first voltage
During limit value, the reference voltage is controlled to provide module, the second reference voltage is provided, wherein, second reference voltage is more than described
First reference voltage；
Judge the voltage of the power supply less than under the predetermined voltage range when detecting signal according to the first voltage
During limit value, the reference voltage is controlled to provide module, the 3rd reference voltage is provided, wherein, the 3rd reference voltage is less than described
First reference voltage.
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| CN201611036024.8A CN108076543B (en) | 2016-11-18 | 2016-11-18 | Electromagnetic heating system and zero-crossing detection device and method thereof |
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| CN201611036024.8A CN108076543B (en) | 2016-11-18 | 2016-11-18 | Electromagnetic heating system and zero-crossing detection device and method thereof |
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| Publication number | Publication date |
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| CN108076543B (en) | 2021-08-20 |
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