CN210168239U - Power control circuit and heating electric appliance for reducing EMI interference - Google Patents
Power control circuit and heating electric appliance for reducing EMI interference Download PDFInfo
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- CN210168239U CN210168239U CN201920957842.4U CN201920957842U CN210168239U CN 210168239 U CN210168239 U CN 210168239U CN 201920957842 U CN201920957842 U CN 201920957842U CN 210168239 U CN210168239 U CN 210168239U
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- 238000001514 detection method Methods 0.000 description 3
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- 238000004519 manufacturing process Methods 0.000 description 2
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- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
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- 238000001914 filtration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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Abstract
The utility model discloses a power control circuit and a heating electric appliance for reducing EMI interference, which comprises a heating module connected to an AC power supply, wherein the heating module comprises a first heating device and a second heating device; and the power control module is respectively connected with the alternating current signal and the heating module, controls the first heating device and the second heating device to independently and alternately work through the positive half cycle and the negative half cycle of the alternating current power supply when the power control module works at half power, and controls the first heating device and the second heating device to work in parallel when the power control module works at full power. The utility model discloses a power control module is at half power during operation, and the positive and negative half cycle that the device passes through alternating current power supply is singly worked in turn to the first device and the second device that generates heat of control, at full power during operation, and the first device and the parallel work of the device that generate heat of control do not change the frequency of alternating current on the one hand, do not change test equipment's impedance value, do not change test equipment's reference voltage, EMI has been reduced, and on the other hand utilizes the principle that the magnetic flux is cancelled to reach and reduce EMI.
Description
Technical Field
The utility model relates to an integrated circuit design field especially relates to a reduce power control circuit, heating appliance of EMI interference.
Background
At present, two methods for reducing power by half are available, the first method is an electronic method and high in cost, the first method is to use a relay to carry out a controller, output power is controlled by frequent on-off of components, the components are limited by certain switching times, and the service life of the components is seriously influenced by frequent on-off; the second method is to use silicon controlled rectifier control and realize power regulation by chopping and zero-crossing detection. The control method by the chopping mode can generate very serious electromagnetic interference; on the one hand, the zero-crossing detection is carried out, the unqualified loss period can generate serious electromagnetic interference, on the other hand, the zero-crossing detection is usually realized through components with switching characteristics, the components still have certain voltage drop when being conducted, and under the condition that the time interval is very short, although the voltage is small, the serious electromagnetic interference can be generated, and the EMI test result is influenced. The second is mechanical type, the scheme that power is halved is exactly to use a diode to go periodic processing, it is same, same with the principle of electronic type, this kind of diode self also can have the conduction pressure drop, still can have serious EMI to disturb under the condition that the time is short, need increase extra filter plate usually and just can solve, increase cost, also brought very big degree of difficulty for the assembly, influence efficiency, reduce the productivity, if with its application to some heating appliances, if can produce serious electromagnetic interference in the mechanical rice cooker, can solve in the mechanical kettle, need increase extra filter plate and just can solve, increase cost, user experience is relatively poor.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome among the prior art power control process can produce serious electromagnetic interference and need increase extra filtering board, the technical problem of incremental cost provides a power control circuit, the heating electrical apparatus that reduce EMI and disturb.
In order to achieve the above object, the utility model adopts the following technical scheme: a power control circuit that reduces EMI interference, comprising:
the heating module is connected to an alternating current power supply and comprises a first heating device and a second heating device;
and the power control module is respectively connected with the alternating current signal and the heating module, controls the first heating device and the second heating device to independently and alternately work through the positive half cycle and the negative half cycle of the alternating current power supply when the power control module works at half power, and controls the first heating device and the second heating device to work in parallel when the power control module works at full power.
Furthermore, the power control module comprises a power selection switch, a first one-way conduction device and a second one-way conduction device, the first one-way conduction device is connected with the first heating device, and the second one-way conduction device is connected with the second heating device.
Further, the power selection switch includes one or more of a mechanical key switch, a thyristor switch, a ganged switch, and a relay switch.
Further, the first unidirectional conducting device and the second unidirectional conducting device are both diode elements.
Furthermore, the device also comprises a control switch, and the control switch is used for controlling the alternating current power supply.
Further, the device also comprises a protection device.
Further, the protection device comprises one or more of a fuse link and a temperature limiter.
Further, the multifunctional device comprises one or more of a dumping switch and a timer.
A heating appliance comprising a controller integrated with the above-described EMI interference reducing power control circuit.
Further, the heating electric appliance comprises one or more of a mechanical electric cooker and a mechanical kettle.
By the aforesaid right the utility model discloses a description can know, compared with the prior art, the utility model provides a pair of reduce EMI interference's power control circuit, heating apparatus, through power control module at half power during operation, control first heating device and second heating device and pass through alternating current power supply's positive and negative half week and work in turn alone, at full power during operation, control first heating device and second heating device parallel operation, do not change the frequency of alternating current on the one hand, do not change test equipment's impedance value, do not change test equipment's reference voltage, EMI has been reduced, on the other hand utilizes the principle of magnetic flux cancellation to reach and reduce EMI.
Drawings
FIG. 1 is a circuit diagram of the power control circuit for reducing EMI interference;
FIG. 2 is a schematic diagram of a test circuit for a power control circuit for reducing EMI interference according to the present invention;
fig. 3 is a half-power working waveform diagram of the power control circuit for reducing EMI interference.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
It should be noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of the present invention, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As shown in fig. 1, a power control circuit for reducing EMI interference includes an ac power supply 1, a control switch S1, a protection device 2, a power control module 3, a heating module 4,
the N line of the alternating current power supply 1 is connected with the protection device 2 and the power control module 3 through the control switch S1 and returns to the L line of the alternating current power supply through the heating module 4, the protection device 2 can be a fuse link, a temperature limiter and the like, the electrical safety of the circuit is protected, the safety of the circuit is improved,
the heating module 4 includes a first heat generating device 41 and a second heat generating device 42;
the power control module 3 includes a power selection switch S2, a first unidirectional conducting device D1, and a second unidirectional conducting device D2, wherein the first unidirectional conducting device and the second unidirectional conducting device may be any electronic components including PN junctions, so as to realize unidirectional conducting characteristics to the ac power supply 1, in this embodiment, a diode component is used, so as to reduce the production cost of the circuit, and facilitate popularization and mass production, the first unidirectional conducting device D1 is connected to the first heat generating device 41, the second unidirectional conducting device D2 is connected to the second heat generating device 42, when the circuit is operated at half power, the first heat generating device 41 and the second heat generating device 42 are controlled to be operated separately and alternately through the positive and negative half cycles of the ac power supply 1, when the circuit is operated at full power, the first heat generating device 41 and the second heat generating device 42 are controlled to be operated in parallel, and the power selection switch S2 may be a mechanical key switch, Any one of the thyristor switch, the duplex switch and the relay switch can also be a cascade switch formed by a plurality of switches, and the reliability of the power selection switch structure can be better ensured by adopting the cascade switch.
When the half-power circuit works, the control switch S1 is closed, the protection device 2 is normally conducted and works, the current reaches the power selection switch S2, when the half-power circuit works, the current returns to an N line through the first diode D1 and the first heating device 41 by utilizing the one-way conduction characteristic and the positive half cycle of the diode; in the negative half cycle, the current returns to the L line from the N line through the second heating device 42, the second diode D2, the power selection switch S2, the protection device 2 and the control switch S1, so that half-power heating is realized; when the power supply operates at full power, the current returns to the N line from the power selection switch S2 through the first heat generating device 41 and the second heat generating device 42, and at this time, the first heat generating device 41 and the second heat generating device 42 are in a parallel connection state, so that full power output is realized.
As shown in fig. 2, an EMI test circuit is used to perform an EMI test on the power control circuit for reducing EMI interference, where eut (equipment under test) is a device under test, and lisn (line impedance stabilization network) is a linear impedance stabilization network; the EUT is placed on an insulated test board, a flitch with good grounding is arranged at the lower part of the test board, and the size and the installation height of the test board and the flitch are specified in a standard way; where L1 and L2 function to filter the external grid and C1 and C2 are to block low frequency current coming from the EUT or the grid, the essence of the conduction test is to measure the voltage to ground generated by the interfering current flowing through resistor R1 or R2. According to the capacitive reactance Z being 1/wc, C1 and C2 can generate a certain voltage division effect on the alternating current of 50HZ, that is, the actual voltages to ground of R1 and R2 are on a certain voltage basis, once the frequency changes, the magnitude of the capacitive reactance generated by C1 and C2 changes, the original reference voltage is broken, and the EMI test problem occurs,
when the power control circuit for reducing EMI interference realizes half-power operation, waveforms are as shown in fig. 3, u0 and u1 are conduction voltage drops of a diode D1, u2 and u3 are conduction voltage drops of a diode D2, in a positive half cycle and at a time period of t0 to t1, the diode D1 is conducted, and the first heat generating device 41 operates; in the negative half cycle and at the stage of time t 2-t 3, the diode D2 is conducted, the second heating device 42 works, the working waveform of the half power is still 50HZ, the frequency of alternating current is not changed, the reference voltage of test equipment is not influenced, and ENI interference is not generated; in addition, in the positive half cycle of the alternating current, the current returns to the line L through the diode D1, the first heat generator 41 and the line N; in the negative half cycle of the alternating current, the current returns to the live line through the N line, the diode D2 and the second heater 42, and the magnetic fluxes generated by the conducting voltage of the diode in the positive half cycle and the negative half cycle are just opposite to each other, so that the equal amount of magnetic flux cancellation is generated, and the EMI interference is greatly reduced.
In addition, the power control circuit for reducing EMI interference can be connected with functional devices 5 in series, such as a tilt switch, a timer and the like, so that different functions can be realized, and the functions of the circuit are increased.
The embodiment also provides a heating electric appliance, the heating electric appliance comprises a controller, the controller is integrated with the power control circuit for reducing the EMI interference, and the heating electric appliance can be a mechanical electric cooker, a mechanical kettle and the like.
By the aforesaid right the utility model discloses a description can know, compared with the prior art, the utility model provides a pair of reduce EMI interference's power control circuit, heating apparatus, through power control module at half power during operation, control first heating device and second heating device and pass through alternating current power supply's positive and negative half week and work in turn alone, at full power during operation, control first heating device and second heating device parallel operation, do not change the frequency of alternating current on the one hand, do not change test equipment's impedance value, do not change test equipment's reference voltage, EMI has been reduced, on the other hand utilizes the principle of magnetic flux cancellation to reach and reduce EMI.
The aforesaid is only a plurality of concrete implementation manners of the utility model, nevertheless the utility model discloses a design concept is not limited to this, and the ordinary use of this design is right the utility model discloses carry out immaterial change, all should belong to the act of infringement the protection scope of the utility model.
Claims (10)
1. A power control circuit for reducing EMI interference, comprising:
the heating module is connected to an alternating current power supply and comprises a first heating device and a second heating device;
and the power control module is respectively connected with the alternating current signal and the heating module, controls the first heating device and the second heating device to independently and alternately work through the positive half cycle and the negative half cycle of the alternating current power supply when the power control module works at half power, and controls the first heating device and the second heating device to work in parallel when the power control module works at full power.
2. The EMI interference reduction power control circuit of claim 1, wherein: the power control module comprises a power selection switch, a first one-way conduction device and a second one-way conduction device, the first one-way conduction device is connected with the first heating device, and the second one-way conduction device is connected with the second heating device.
3. The EMI interference reduction power control circuit of claim 2, wherein: the power selection switch includes one or more of a mechanical key switch, a thyristor switch, a ganged switch, and a relay switch.
4. The EMI interference reduction power control circuit of claim 2, wherein: the first unidirectional conducting device and the second unidirectional conducting device are diode elements.
5. The EMI interference reduction power control circuit of claim 1, wherein: the control circuit also comprises a control switch, and the control switch is used for controlling the alternating current power supply.
6. The EMI interference reduction power control circuit of claim 1, wherein: a protection device is also included.
7. The EMI interference reduction power control circuit of claim 6, wherein: the protection device comprises one or more of a fuse link and a temperature limiter.
8. The EMI interference reduction power control circuit of claim 1, wherein: also included are functional devices including one or more of a dump switch, a timer.
9. A heating appliance, characterized by: the heating appliance includes a controller integrated with the EMI interference reduction power control circuit of any one of claims 1-8.
10. The heating appliance according to claim 9, characterized in that: the heating electric appliance comprises one or more of a mechanical electric cooker and a mechanical kettle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920957842.4U CN210168239U (en) | 2019-06-25 | 2019-06-25 | Power control circuit and heating electric appliance for reducing EMI interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920957842.4U CN210168239U (en) | 2019-06-25 | 2019-06-25 | Power control circuit and heating electric appliance for reducing EMI interference |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210168239U true CN210168239U (en) | 2020-03-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920957842.4U Expired - Fee Related CN210168239U (en) | 2019-06-25 | 2019-06-25 | Power control circuit and heating electric appliance for reducing EMI interference |
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| Country | Link |
|---|---|
| CN (1) | CN210168239U (en) |
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2019
- 2019-06-25 CN CN201920957842.4U patent/CN210168239U/en not_active Expired - Fee Related
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