CN107561349A - The zero passage detection and voltage sampling method and circuit of electromagnetic heater - Google Patents
The zero passage detection and voltage sampling method and circuit of electromagnetic heater Download PDFInfo
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- CN107561349A CN107561349A CN201710710827.5A CN201710710827A CN107561349A CN 107561349 A CN107561349 A CN 107561349A CN 201710710827 A CN201710710827 A CN 201710710827A CN 107561349 A CN107561349 A CN 107561349A
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Abstract
The present invention provides a kind of zero passage detection and voltage sampling method of electromagnetic heater, and the electromagnetic heater includes power supply circuit, and methods described includes：Detect the voltage over zero of the power supply circuit；When detecting voltage over zero, stop voltage zero-cross and detect and continue the second preset time T 2；Voltage sample is carried out from voltage over zero the first preset time T 1 of delay, and continues Δ T time.Detected, prevented near voltage over zero by turning off voltage zero-cross when detecting voltage over zero, because voltage pulsation causes multiple zero passage occur, and cause the situation controlled by mistake electromagnetic heater；And carried out by the way that the time of voltage sample is delayed after the first preset time T 1 from voltage over zero, caused by energy is relatively low and easily disturbed when avoiding voltage over zero the problem of voltage sample value inaccuracy, voltage sample value is more accurate.The present invention also provides a kind of using the zero passage detection and the circuit of voltage sampling method.
Description
Technical field
The present invention relates to field of kitchen electric appliance, more particularly to a kind of zero passage detection of electromagnetic heater and voltage sample side
Method, and the zero passage detection and voltage sampling circuit of electromagnetic heater.
Background technology
Voltage sampling circuit can be often provided with the circuit control system of electromagnetic heater, voltage sampling circuit is examining
The voltage of power network is surveyed, for overvoltage protection and under-voltage protection, prevents the fluctuation of line voltage is larger from being caused damage to electrical equipment.It is existing
It is to be sampled in whole voltage cycle to have voltage sample in technology, but near voltage over zero, voltage is easily by power
The influence of pipe break-make, Electromagnetic Heating, fluctuation is larger, causes the value of voltage sample inaccurate；And near voltage over zero, because of electricity
The phenomenon for triggering multiple zero passage occurs in pressure fluctuation, influences voltage sample condition judgment and electromagnetic heater is just ensured
Shield and control.
Thus, it is necessory to provide a kind of technical scheme, the defects of to overcome above-mentioned prior art to exist.
The content of the invention
The technical problems to be solved by the invention are overcome the deficiencies in the prior art and to provide a kind of voltage sample accurate
Electromagnetic heater zero passage detection and voltage sampling method and circuit.
In order to achieve the above object, a kind of technical scheme of the invention is as follows：
The zero passage detection and voltage sampling method of a kind of electromagnetic heater, wherein, the electromagnetic heater includes supplying
Circuit, methods described include：Detect the voltage over zero of the power supply circuit；When detecting voltage over zero, stop electricity
Pressure zero passage detection simultaneously continues the second preset time T 2；Voltage sample is carried out from voltage over zero the first preset time T 1 of delay, and
Continue Δ T time.Detected, prevented near voltage over zero by turning off voltage zero-cross when detecting voltage over zero, because
Voltage pulsation causes multiple zero passage occur, and causes the situation controlled by mistake electromagnetic heater；And by by voltage sample
Time is delayed after the first preset time T 1 from voltage over zero and carried out, and energy is relatively low when avoiding voltage over zero and Yi Beigan
Caused by disturbing the problem of voltage sample value inaccuracy, voltage sample value is more accurate, and the protection to electromagnetic heater is more timely, control
System is more accurate.
In an embodiment of the present invention, first preset time T 1 meets 2ms≤T1≤4ms, and the Δ T time meets
3ms≤ΔT≤5ms.It is sufficient in this section of time collecting energy, and voltage stability is preferable, avoids Electromagnetic Heating to power network
Interference, the inaccurate situation of collection is effectively evaded.
In an embodiment of the present invention, the voltage of the power supply circuit is lighted from voltage zero-cross and includes stopping voltage mistake successively
The first stage of zero detection and the second stage of turning-on voltage zero passage detection, the Δ T time of the voltage sample is positioned at described the
In one stage.
In an embodiment of the present invention, second preset time T 2 meets：1ms≤T2≤9ms.Pass through holding shut-off
The continuous time is arranged on the scope, and can effectively avoid interference signal and does not influence the detection of normal zero crossing next time.
In an embodiment of the present invention, the electromagnetic heater includes main control chip, is integrated with the main control chip
Voltage comparator for zero passage detection and the a/d converter for voltage sample, the voltage comparator and the a/d converter
It is connected to the same pin of the main control chip.The pin of main control chip is effectively saved, reduces cost, while also reach
Remove the effect of interference.
In an embodiment of the present invention, first preset time T 1 meets 3ms≤T1≤7ms, and described second is default
Time T2 meets 7ms ＜ T2≤9ms.Stagger to handle to realize by timesharing and voltage signal is carried out under one interface of main control chip
Collection and the detection of zero cross signal are multiplexed.
In order to achieve the above object, the present invention also provides following technical scheme：
The zero passage detection and voltage sampling circuit of a kind of electromagnetic heater, it includes the voltage zero-cross for detecting circuit
The zero passage detection module of point, and to carry out the voltage sample module of voltage sample, it is characterised in that the Electromagnetic Heating dress
The zero passage detection and voltage sampling circuit put also include shut-off and open module, and delayed startup module, the delayed startup
Module is connected with the voltage sample module, to when the zero passage detection module detects voltage over zero delay it is first pre-
If time T1 starts the voltage sample module, the shut-off and open module and be connected with the zero passage detection module, to
The zero passage detection module turns off the zero passage detection module when detecting the voltage over zero.By set up shut-off and it is open-minded
Module, and delayed startup module, zero passage detection module can be turned off in zero crossing, and delay preset time opens in zero crossing
Dynamic voltage detecting, it effectively prevent in voltage over zero because voltage pulsation triggers the problem of multiple zero passage causes to control by mistake；And
The problem of energy is relatively low when avoiding voltage over zero and is easily disturbed caused voltage sample value inaccuracy, voltage sample value
More precisely, the protection to electromagnetic heater is more timely, control is more accurate.
In an embodiment of the present invention, the shut-off and open module shut-off zero passage detection module and continue second it is default when
Between open the zero passage detection module again after T2, second preset time T 2 is more than first preset time T 1.
In an embodiment of the present invention, the voltage sample starts from first preset time T 1, and when continuing Δ T
Between, the Δ T time is located in second preset time T 2.T1 is located in the second preset time T 2 with Δ T time, i.e. voltage
The time of sample-duration was in the period of zero passage detection stopping, and the timesharing that voltage sample and zero passage detection can be achieved is carried out,
Avoid influencing each other.
In an embodiment of the present invention, the electromagnetic heater includes main control chip, and the zero passage detection module includes
Voltage comparator, the voltage sample module include a/d converter, and the voltage comparator and the a/d converter are integrated in institute
State in main control chip and be connected to the same pin of the main control chip, the a/d converter staggeredly opens with the voltage comparator
It is dynamic.
In an embodiment of the present invention, the electromagnetic heater includes main control chip, and the zero passage detection module includes
Voltage comparator, the voltage sample module include a/d converter, and the voltage comparator is connected to the one of the main control chip
On pin, the a/d converter is connected on another pin of the main control chip.Zero passage detection module and voltage sample module
Individually controlled by two pins of main control chip, it is unaffected mutually.
The present invention electromagnetic heater zero passage detection and voltage sampling circuit and method, by by voltage sample when
Between from voltage over zero be delayed the first preset time T 1 after carry out, effectively avoid in voltage over zero, energy it is relatively low and
It is easily disturbed, caused by voltage sample value inaccuracy the problem of so that voltage sample value is more accurate, to electromagnetic heater
Protection is more timely, control is more accurate；By the way that when detecting the voltage over zero of power supply circuit, shut-off voltage zero-cross is detected and held
Continuous second preset time T 2, effectively prevent near voltage over zero, because voltage pulsation causes multiple zero passage occur, and causes
The situation controlled by mistake electromagnetic heater.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to needed for embodiment
The accompanying drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention,
For those of ordinary skill in the art, on the premise of not paying creative work, can also be obtained according to these accompanying drawings
Other accompanying drawings.
Fig. 1 is the circuit diagram of electromagnetic heater in one embodiment of the invention；
Fig. 2 is the voltage oscillogram at P points in Fig. 1；
Fig. 3 is the zero passage detection of electromagnetic heater of the present invention and the module diagram of voltage sampling circuit；
Fig. 4 is the schematic diagram of main control chip in another embodiment of the present invention.
Reference：
1- power supply circuits；20- zero passage detection modules；21- turns off and opened module；22- voltage comparators；30- voltages are adopted
Egf block；31- delayed startup modules；32-AD converters；5- main control chips.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Embodiment one
Fig. 1 to Fig. 2 is referred to, the present invention provides a kind of zero passage detection and voltage sampling method of electromagnetic heater, institute
It can be electromagnetic oven or the cooking apparatus of other Electromagnetic Heatings to state electromagnetic heater, first introduce correlation by taking electromagnetic oven as an example below
Circuit diagram, refer to Fig. 1.The circuit includes power supply circuit 1, and the power supply circuit 1 introduces from the live wire L and zero line N of civil power, warp
Zero passage detection and voltage sample are carried out after crossing diode D200 and D201 shaping, the power supply circuit 1 also includes being connected across live wire L
Cross-line electric capacity C1, C2 between zero line N and the fuse FUSE1 being serially connected on live wire L.The power supply circuit 1 can refer to
Prior art, drive circuit, current sample and surge protection circuit, synchronous circuit, switching power circuit shown in Fig. 1 etc.
Prior art is can refer to, here is omitted.
Fig. 1 is continued referring to, civil power is connected with divider resistance R201 and R202 after diode D200 and D201, point
Sampled point P, the sampled point P are formed at tie point between piezoresistance R201 and R202 and is connected to the pin of main control chip 5, with
Signal is conveyed to main control chip 5, the electromagnetic heater is controlled for main control chip 5.Further, the divider resistance R202
Filter capacitor C203 is also parallel with, one end of the divider resistance R202 and filter capacitor C203 are connected to the sampled point P,
The other end of the divider resistance R202 and filter capacitor C203 are grounded.
Referring to Fig. 2, when the normal input AC electricity of civil power, the voltage oscillogram of the sampled point P is as shown in Figure 2.This
The zero passage detection and voltage sampling method of invention electromagnetic heater include：Detect the voltage over zero of the power supply circuit；From
Start voltage sample after voltage over zero the first preset time T 1 of delay, and continue Δ T time.The present invention is by by voltage sample
Time be delayed after the first preset time T 1 and carry out from voltage over zero, energy is relatively low when avoiding voltage over zero and easy quilt
Caused by interference the problem of voltage sample value inaccuracy, voltage sample value is more accurate, the protection to electromagnetic heater more in time,
Control is more accurate.It is voltage over zero during d positions, the present invention is detecting electricity as shown in Fig. 2 sampled point P magnitude of voltage is a
When pressing through zero point a, be delayed the first preset time T 1, i.e., in fig. 2 shown b points when start voltage sample, within the a-b periods not
Carry out voltage sample.Further, first preset time T 1 meets 2ms≤T1≤4ms, the Δ T time meet 3ms≤
ΔT≤5ms.For the alternating current that frequency is 50HZ, the time between a points and d points is about 10ms, and the first preset time T 1 is relative
In voltage over zero a delays within 2-4ms, and sample-duration 3-5ms, it may be such that now voltage sample value is in a high position, energy
Amount is sufficient, stability is good.Preferably, first preset time T 1 takes 3ms, and Δ T time takes 4ms, i.e., is opened after zero crossing 3ms
Dynamic voltage sample, continues 4ms, voltage sample terminates in zero crossing 7ms.
Further, the voltage of the power supply circuit is lighted from voltage zero-cross includes stopping the of voltage zero-cross detection successively
One stage, such as the period of a points in Fig. 2 to e points, and the second stage of turning-on voltage zero passage detection, such as the e points in Fig. 2 to d
The period of point, the voltage sample (the b points in such as Fig. 2 arrive the period of c points) is in first stage progress.The voltage
Sampling continues 4ms since b points, terminates to sample in c points, sufficient in this section of time collecting energy, and voltage stability is preferable, keeps away
Exempt from interference of the Electromagnetic Heating to power network, effectively evade the inaccurate situation of collection.Within the time of b points to c points, the voltage
Sampling number is preferably 8 times to 16 times.
Please continue to refer to Fig. 2, the method for the invention is additionally included in the voltage over zero a for detecting the power supply circuit
When, shut-off voltage zero-cross detects and continues the second preset time T 2.By turning off voltage zero-cross when detecting voltage over zero
Detection, is prevented near voltage over zero, because voltage pulsation causes to occur detecting multiple zero passage, and causes to fill Electromagnetic Heating
Put the situation of control by mistake.As shown in Fig. 2 opened again when a points shut-off voltage zero-cross detects and continues the second preset time T 2 to e points
Logical voltage zero-cross detection.Second preset time T 2 meets 1ms≤T2≤9ms, and preferably T2 is more than or equal to 1ms, and is less than
Equal to 5ms, it is specifically as follows 2ms, 3ms, 4ms etc..The zero passage detection can lead to the voltage sample in one embodiment
Two pins for crossing main control chip 5 are attached with main control chip 5 respectively, and two pins are not interfere with each other during processing, thus zero passage
Detection can be carried out synchronously with voltage sample, also can staggeredly be carried out.In another embodiment, the zero passage detection is adopted with the voltage
Sample is connected to the same pin of main control chip 5, and zero passage detection and voltage sample are staggeredly carried out, referring to Fig. 2, in b-c ranks
Section is the voltage sample stage, and the e-d stages are the zero passage detection stage, and e-d periods and b-c period stagger, i.e. the e-d times
The Duan Buyu b-c periods have overlapping, you can realize that a pin multiplexing realizes the dual-use function of zero passage detection and voltage sample.It is excellent
Choosing, first preset time T 1 meets 3ms≤T1≤7ms, and second preset time T 2 meets 7ms ＜ T2≤9ms.
Embodiment two
Fig. 3 and Fig. 4 are referred to, the present invention also provides the zero passage detection and voltage sampling circuit of a kind of electromagnetic heater.
The circuit includes zero passage detection module 20, turns off and open module 21, voltage sample module 30 and delayed startup module 31, institute
Zero passage detection module 20 is stated to detect the voltage over zero of circuit, it is described to turn off and open module 21 and the zero passage detection mould
Block 20 is connected, and to zero passage detection module 20 described in either off or on, the voltage sample module 30 is to voltage sample, institute
State delayed startup module 31 with the voltage sample module 30 to be connected, to detect voltage mistake in the zero passage detection module 20
First preset time T 1 that is delayed during zero point starts the voltage sample module 30.
Further, it is described to turn off and open module 21 to when detecting the voltage over zero, shut-off zero passage is examined
Survey module 20 and open the zero passage detection module 20 again after continuing the second preset time T 2, second preset time T 2 is more than
First preset time T 1.The voltage sample starts from first preset time T 1, and continues Δ T time, the Δ T
Time is located in second preset time T 2.
Referring to Fig. 4, in a preferred embodiment, the electromagnetic heater includes main control chip, the zero passage detection
Module 20 includes voltage comparator 22, and the voltage sample module 30 includes a/d converter 32, the voltage comparator 22 and institute
State the same pin that a/d converter 32 is integrated in the main control chip and is connected to the main control chip, such as drawing marked as 9
Pin, the voltage comparator 22 staggeredly start with the a/d converter 32.The electromagnetic heater in the preferred embodiment
Control process it is as follows：A pin of main control chip is connected to after the rectified partial pressure of civil power, main control chip has been internally integrated
The voltage comparator 22 and a/d converter 32 of the pin are connected to, main control chip controlling switch transmitted voltage signal to electricity before this
Comparator 22 is pressed, voltage over zero is detected by voltage comparator 22, when detecting zero crossing, main control chip control voltage compares
The function of device 22 turns off, while start-up study register, and when the delay register time reaches T1, controlling switch transmits voltage signal
Carry out voltage sample to a/d converter 32, sample-duration for a period of time after, such as can be 3ms, 4ms, 5ms, after 6ms, stopping
Voltage sample, when the delay register time T2 is reached, main control chip controlling switch transmits voltage signal to voltage comparator
22, the zero passage detection in next cycle is carried out, so circulation.Realize to enter under one interface of main control chip by timesharing processing of staggering
The collection of row voltage signal and the detection multiplexing of zero cross signal.Certainly, in other embodiment, the voltage comparator 22 and AD turn
Parallel operation 32 can also connect single pin respectively, i.e., described voltage comparator is connected on a pin of the main control chip, institute
A/d converter is stated to be connected on another pin of the main control chip, be arranged such voltage sample and zero passage detection independently carry out,
It is independent of each other.
By described above, the invention provides a kind of zero passage detection of electromagnetic heater and voltage sampling circuit
And method, carried out by the way that the time of voltage sample is delayed after the first preset time T 1 from voltage over zero, effectively avoided
During voltage over zero, energy is relatively low and easily disturbed, caused by voltage sample value inaccuracy the problem of so that voltage sample
Value is more accurate, and the protection to electromagnetic heater is more timely, control is more accurate；And by detecting the voltage mistake of power supply circuit
During zero point, shut-off voltage zero-cross detects and continues the second preset time T 2, effectively prevent near voltage over zero, because of voltage
Fluctuation causes multiple zero passage occur, and causes the situation controlled by mistake electromagnetic heater.
In the description of the invention, it is to be understood that term " " center ", " transverse direction ", " thickness ", " on ", " under ", " perpendicular
Directly ", the orientation of the instruction such as " level ", " top ", " bottom ", " interior ", " outer ", " radial direction ", " circumference " or position relationship are based on accompanying drawing
Shown orientation or position relationship, it is for only for ease of and describes the present invention and simplify description, rather than indicates or imply meaning
Device or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to the present invention's
Limitation.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed or
Implicitly include one or more this feature.In the description of the invention, " multiple " are meant that two or more,
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 fixedly connected or be detachably connected, or integrally；It can be direct phase
Even, it can also be indirectly connected by intermediary, can be that the connection of two element internals or the interaction of two elements are closed
System.For the ordinary skill in the art, above-mentioned term in the present invention specific can be understood as the case may be
Implication.
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 directly contact, or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, the change or replacement that can readily occur in, all should
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be defined by scope of the claims.
Claims (10)
1. the zero passage detection and voltage sampling method of a kind of electromagnetic heater, it is characterised in that the electromagnetic heater bag
Power supply circuit is included, methods described includes：
Detect the voltage over zero of the power supply circuit；
When detecting voltage over zero, stop voltage zero-cross and detect and continue the second preset time T 2；
Voltage sample is carried out from voltage over zero the first preset time T 1 of delay, and continues Δ T time.
2. the zero passage detection and voltage sampling method of electromagnetic heater as claimed in claim 1, it is characterised in that described
One preset time T 1 meets 2ms≤T1≤4ms, and the Δ T time meets 3ms≤Δ T≤5ms.
3. the zero passage detection and voltage sampling method of electromagnetic heater as claimed in claim 1, it is characterised in that described
Two preset time Ts 2 meet：1ms≤T2≤9ms.
4. the zero passage detection and voltage sampling method of the electromagnetic heater as described in any claim in claims 1 to 3,
Characterized in that, the voltage of the power supply circuit is lighted from voltage zero-cross includes the first stage for stopping voltage zero-cross detection successively
With the second stage of turning-on voltage zero passage detection, the Δ T time of the voltage sample was located in the first stage.
5. the zero passage detection and voltage sampling method of electromagnetic heater as claimed in claim 4, it is characterised in that the electricity
Magnetic heater includes main control chip, and the voltage comparator detected for voltage zero-cross is integrated with the main control chip and is used for
The a/d converter of voltage sample, the voltage comparator and the a/d converter are connected to the same pin of the main control chip.
6. the zero passage detection and voltage sampling circuit of a kind of electromagnetic heater, it includes the voltage over zero for detecting circuit
Zero passage detection module, and to carry out the voltage sample module of voltage sample, it is characterised in that the electromagnetic heater
Zero passage detection and voltage sampling circuit also include shut-off and open module, and delayed startup module, the delayed startup mould
Block is connected with the voltage sample module, to when the zero passage detection module detects voltage over zero delay first it is default
Time T1 starts the voltage sample module, the shut-off and opens module and is connected with the zero passage detection module, in institute
State and the zero passage detection module is turned off when zero passage detection module detects the voltage over zero.
7. the zero passage detection and voltage sampling circuit of electromagnetic heater as claimed in claim 6, it is characterised in that the pass
Break and open module shut-off zero passage detection module and open the zero passage detection module again after continuing the second preset time T 2, it is described
Second preset time T 2 is more than first preset time T 1.
8. the zero passage detection and voltage sampling circuit of electromagnetic heater as claimed in claim 7, it is characterised in that the electricity
Pressure sampling starts from first preset time T 1, and continues Δ T time, and the Δ T time is located at second preset time
In T2.
9. the zero passage detection and voltage sampling circuit of electromagnetic heater as claimed in claim 6, it is characterised in that the electricity
Magnetic heater includes main control chip, and the zero passage detection module includes voltage comparator, and the voltage sample module includes AD
Converter, the voltage comparator and the a/d converter are integrated in the main control chip and are connected to the main control chip
Same pin, the a/d converter staggeredly start with the voltage comparator.
10. the zero passage detection and voltage sampling circuit of electromagnetic heater as claimed in claim 6, it is characterised in that described
Electromagnetic heater includes main control chip, and the zero passage detection module includes voltage comparator, and the voltage sample module includes
A/d converter, the voltage comparator are connected on a pin of the main control chip, and the a/d converter is connected to the master
On another pin for controlling chip.
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| CN201710710827.5A CN107561349A (en) | 2017-08-18 | 2017-08-18 | The zero passage detection and voltage sampling method and circuit of electromagnetic heater |
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| CN201710710827.5A CN107561349A (en) | 2017-08-18 | 2017-08-18 | The zero passage detection and voltage sampling method and circuit of electromagnetic heater |
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| CN110446286A (en) * | 2018-05-03 | 2019-11-12 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating cooking utensil and its control method, device |
| CN108896813A (en) * | 2018-06-29 | 2018-11-27 | 广东美的环境电器制造有限公司 | A kind of detection method of zero cross signal, system, device and computer storage medium |
| CN109655659A (en) * | 2019-01-30 | 2019-04-19 | 上海艾为电子技术股份有限公司 | One kind being used for LRA motor BEMF zero passage method for detecting area and system |
| CN109655659B (en) * | 2019-01-30 | 2021-09-28 | 上海艾为电子技术股份有限公司 | BEMF zero-crossing region detection method and system for LRA motor |
| CN110108928A (en) * | 2019-05-23 | 2019-08-09 | 九阳股份有限公司 | A kind of alternating voltage zero-crossing detection method based on ac voltage detection circuit |
| CN110108928B (en) * | 2019-05-23 | 2021-04-09 | 九阳股份有限公司 | Alternating voltage zero-crossing detection method based on alternating voltage detection circuit |
| CN111225463A (en) * | 2020-01-18 | 2020-06-02 | 九阳股份有限公司 | Power control method for electromagnetic cooking appliance, electromagnetic cooking appliance and medium |
| CN114205941A (en) * | 2020-09-18 | 2022-03-18 | 杭州九阳小家电有限公司 | Electromagnetic heating control circuit and method |
| CN112555925A (en) * | 2021-01-12 | 2021-03-26 | 佛山市顺德区百洛电器有限公司 | Noise reduction method for induction cooker with more than two wire coils |
| CN114184830A (en) * | 2021-11-01 | 2022-03-15 | 杭州涂鸦信息技术有限公司 | Zero-crossing detection circuit and electronic equipment |
| RU2780348C1 (en) * | 2021-12-19 | 2022-09-21 | Ярослав Кириллович Соломенцев | Method for measuring the real and imaginary components of alternating voltage |
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