CN205946222U - Low-power standby circuit and induction cooker - Google Patents
Low-power standby circuit and induction cooker Download PDFInfo
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- CN205946222U CN205946222U CN201620935499.XU CN201620935499U CN205946222U CN 205946222 U CN205946222 U CN 205946222U CN 201620935499 U CN201620935499 U CN 201620935499U CN 205946222 U CN205946222 U CN 205946222U
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- 230000006698 induction Effects 0.000 title claims description 22
- 238000001914 filtration Methods 0.000 claims abstract description 13
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 34
- 230000007935 neutral effect Effects 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 230000001419 dependent effect Effects 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model provides a low-power standby circuit and electromagnetism stove, this low-power standby circuit includes: the device comprises a mains supply input circuit, a first EMC filter circuit, a rectification filter resonance circuit, a switching power supply circuit and a controllable switching circuit; the switching power supply circuit comprises a switching power supply, a bridge rectifier circuit and a second EMC filter circuit; the switching power supply circuit is arranged at the upstream of the controllable switching circuit, the bridge rectifier circuit is respectively connected with the switching power supply and the second EMC filter circuit, and the second EMC filter circuit is also connected with the mains supply input circuit; the mains supply input circuit is also connected with a first EMC filter circuit, and the first EMC filter circuit is also connected with the rectification wave resonant circuit; the controllable switch circuit is arranged at the upstream of the first EMC filter circuit, is connected in series with a live wire or a zero wire of the mains supply input circuit and is used for controlling the first EMC filter circuit and the rectifying and filtering resonant circuit to be opened and closed. The utility model discloses can reduce the stand-by power of electromagnetism stove.
Description
Technical Field
The utility model relates to a household electrical appliances technical field especially relates to a low-power standby circuit and electromagnetism stove.
Background
An induction cooker is a common household appliance for heating. When the induction cooker works, high-frequency current passes through the coil panel, a high-frequency alternating magnetic field is generated around the coil panel, strong eddy current is generated in an iron pot bottom under the action of the high-frequency alternating magnetic field, and a large amount of heat is rapidly released from the pot bottom to achieve the heating purpose.
At present, the energy-saving requirement of the induction cooker is higher and higher due to the consideration of environmental protection and energy conservation in China, and a high energy efficiency grade represents the need of achieving lower standby power. In the prior art, in order to prevent the induction cooker from interfering with a power grid when the induction cooker works, the induction cooker has to pass a national electromagnetic compatibility (EMC) mandatory standard. Therefore, in the working circuit of the induction cooker, the alternating current input by the commercial power is subjected to interference filtration through the EMC filter circuit. The EMC filter circuit is usually connected with a large capacitor at the power line inlet end to filter out interference, and the large capacitor is connected in parallel with a discharge resistor. However, the large capacitor is connected in the power grid, and when the induction cooker is in a standby state, the large capacitor discharges the discharge resistor, so that the standby power consumption of the circuit is increased, and the energy efficiency level of the whole machine is affected.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a low-power standby circuit and electromagnetism stove to overcome the higher problem of standby power.
In one aspect, the present invention provides a low power standby circuit, including: commercial power input circuit, first EMC filter circuit, rectification filter resonance circuit still include: a switching power supply circuit and a controllable switching circuit; the switching power supply circuit comprises a switching power supply, a bridge rectifier circuit and a second EMC filter circuit; wherein,
the switching power supply circuit is arranged at the upstream of the controllable switching circuit, the bridge rectifier circuit is respectively connected with the switching power supply and the second EMC filter circuit, and the second EMC filter circuit is also connected with the mains supply input circuit;
the mains supply input circuit is further connected with the first EMC filter circuit, and the first EMC filter circuit is further connected with the rectification wave resonant circuit;
the controllable switch circuit is arranged at the upstream of the first EMC filter circuit, is connected in series with a live wire or a zero wire of the mains supply input circuit and is used for controlling the first EMC filter circuit and the rectifying and filtering resonant circuit to be opened and closed.
The low-power standby circuit, commercial power input circuit, first EMC filter circuit, rectification filter resonance circuit, switching power supply circuit and controllable switch circuit that this embodiment provided, when the electromagnetism stove awaits the opportune moment, controllable switch circuit disconnection for first EMC filter circuit and rectification filter resonance circuit do not have voltage no power consumption, thereby have reduced standby power.
Optionally, the second EMC filter circuit includes a first capacitor C4 and a first common-mode inductor L3, two ends of the first capacitor C4 are respectively connected to the live line and the neutral line, and the first common-mode inductor L3 is disposed between the first capacitor C4 and the bridge rectifier circuit.
Due to the fact that the second EMC filter circuit is arranged in the switching power supply circuit, mutual interference between the switching power supply and a power grid can be prevented. In the embodiment, the bridge rectifier circuit is adopted to convert the alternating current into the direct current, and the backflow from the bridge stack is not needed.
Optionally, the switching power supply circuit further includes a first discharge resistor R2 connected in parallel with the first capacitor C4.
Optionally, the controllable switch circuit comprises a relay RY1, a transistor Q1, and a controller;
the switch of the relay RY1 is arranged on the live wire or the zero wire;
the triode Q1 is respectively connected with the relay RY1 and the controller;
the controller is also connected with the rectification filter resonant circuit.
Optionally, the collector of the transistor Q1 is connected to the relay RY1, the base of the transistor Q1 is connected to the controller, and the emitter of the transistor Q1 is grounded.
Optionally, the first EMC filter circuit includes a second capacitor C1, a third capacitor C2, and a second common mode inductor L1, two ends of the second capacitor C1 and the third capacitor C2 are respectively connected to the live line and the neutral line, and the second common mode inductor L1 is disposed between the second capacitor C1 and the third capacitor C2.
Optionally, the method further comprises: and the second discharge resistor R1 is connected with the second capacitor C1 in parallel.
Optionally, the rectifying-filtering resonant circuit includes: the circuit comprises a current conversion circuit, a filter unit and a resonant circuit;
the filtering unit is respectively connected with the current conversion circuit and the resonance circuit.
Optionally, the mains input circuit comprises a fuse and a varistor RZ 1;
the fuse sets up on the live wire, just the fuse sets up piezo-resistor RZ 1's upper reaches, piezo-resistor RZ 1's both ends respectively with live wire and zero line are connected, and set up controllable switch circuit's upper reaches.
In the present embodiment, since the voltage dependent resistor RZ1 is disposed downstream of the FUSE1, the voltage dependent resistor RZ1 can absorb the surge interference of the power grid after the controllable switching circuit is opened, thereby protecting the switching power supply circuit.
On the other hand, the utility model provides an induction cooker, include: the low-power standby circuit comprises a panel, a bottom shell and the low-power standby circuit positioned in the bottom shell.
The structure of the present invention and other objects and advantages thereof will be more clearly understood from the following description of the preferred embodiments taken in conjunction with the accompanying drawings.
Drawings
Fig. 1 is a schematic block diagram of a low power standby circuit provided by the present invention;
fig. 2 is a schematic structural diagram of a low power standby circuit provided by the present invention.
Description of reference numerals:
10-mains supply input circuit 20-first EMC filter circuit 30-rectification filter resonance circuit
40-switching power supply circuit 50-controllable switching circuit 31-current conversion circuit
32-filter unit 33-resonant circuit 41-switching power supply
42-bridge rectifier circuit 43-second EMC filter circuit
Detailed Description
Fig. 1 is a schematic block diagram of a low power standby circuit provided by the present invention. As shown in fig. 1, the low power standby circuit includes: the system comprises a mains supply input circuit 10, a first EMC filter circuit 20, a rectification filter resonance circuit 30, a switching power supply circuit 40 and a controllable switching circuit 50; the switching power supply circuit 40 includes a switching power supply 41, a bridge rectifier circuit 42, and a second EMC filter circuit 43; wherein,
the switching power supply circuit 40 is arranged at the upstream of the controllable switching circuit 50, the bridge rectifier circuit 42 is respectively connected with the switching power supply 41 and the second EMC filter circuit 43, and the second EMC filter circuit 43 is also connected with the commercial power input circuit 10; the mains supply input circuit 10 is further connected with a first EMC filter circuit 20, and the first EMC filter circuit 20 is further connected with a rectification wave resonant circuit; the controllable switch circuit 50 is disposed upstream of the first EMC filter circuit 20, and is connected in series to the live line (L) or the neutral line (N) of the utility power input circuit 10, for controlling the opening and closing of the first EMC filter circuit 20 and the rectifying-filtering resonant circuit 30.
After the induction cooker is plugged with a power supply, the working states mainly comprise two working states and a standby state. Under operating condition, the electromagnetism stove can heat the pan. In the standby state, the main heating loop of the induction cooker does not work any more. Most of the time, the induction cooker is in a standby state. In the low-power standby circuit provided by the embodiment, when the induction cooker is in standby, one line of a live line or a zero line of a commercial power input circuit is cut off to cut off the first EMC filter circuit 20 and the rectifying and filtering resonant circuit 30, so that only the switching power supply circuit 40 for supplying power to weak current devices is in a working state before the induction cooker is restored to the working state, and the standby power is reduced and can reach 0.5W at least.
In a specific implementation process, when the induction cooker is in a standby state and a user starts up, the controllable switch circuit 50 is turned on after the controllable switch circuit 50 obtains a start-up signal of the user. At this time, the ac power is input to the first EMC filter circuit 20 through the commercial power input circuit 10, and after the interference is removed by the first EMC filter circuit 20, the rectifier filter resonant circuit 30 is powered. After the user is powered off, the controllable switch circuit 50 is turned off after the controllable switch circuit 50 obtains a power-off signal of the user, and at this time, the first EMC filter circuit 20 and the rectification filter resonant circuit 30 have no voltage or power consumption.
In this process, since the switching power supply circuit 40 is disposed upstream of the controllable switching circuit 50, the operation of the switching power supply circuit 40 is not affected by the opening and closing of the controllable switching circuit 50 and is always in an operating state.
The switching power supply circuit 40 mainly supplies power to weak current devices, such as various control chips, various sensors, and the like. The alternating current input from the commercial power input circuit 10 firstly passes through the second EMC filter circuit 43 to filter the filter circuit, so as to filter interference, then passes through the bridge rectifier circuit 42 to convert the alternating current into direct current, and finally the direct current is input into the switching power supply 41, and the switching power supply 41 may include a switching power supply chip, a switching power supply transformer and the like, and is used for converting high voltage into low voltage required by weak current devices, and the weak current devices are not supplied with power.
Due to the provision of the second EMC filter circuit in the switching power supply circuit 40, mutual interference of the switching power supply 41 with the grid can be prevented. Also in this embodiment, a bridge rectifier circuit 42 is used to convert the ac power to dc power, and no return from the bridge is required.
The low-power standby circuit, commercial power input circuit, first EMC filter circuit, rectification filter resonance circuit, switching power supply circuit and controllable switch circuit that this embodiment provided, when the electromagnetism stove awaits the opportune moment, controllable switch circuit disconnection for first EMC filter circuit and rectification filter resonance circuit do not have voltage no power consumption, thereby have reduced standby power.
The specific structure of the low power standby circuit provided by the present invention will be described in detail with reference to fig. 2. Fig. 2 is a schematic structural diagram of a low power standby circuit provided by the present invention. The detailed structure of the mains input circuit 10, the first EMC filter circuit 20, the rectifying-filtering resonant circuit 30, the switching power supply circuit 40 and the controllable switching circuit 50 will be described in turn.
As shown in fig. 2, the commercial power input circuit 10 includes a FUSE1 and a varistor RZ1, wherein the FUSE is disposed on the live line and upstream of the varistor RZ1, and two ends of the varistor RZ1 are respectively connected to the live line and the neutral line and disposed upstream of the controllable switch circuit 50. In the present embodiment, since the varistor RZ1 is disposed downstream of the FUSE1, the varistor RZ1 can absorb the surge interference of the power grid after the controllable switching circuit 50 is turned off, thereby protecting the switching power supply circuit 40.
The first EMC filter circuit 20 includes a second capacitor C1, a third capacitor C2, and a second common mode inductor L1, wherein two ends of the second capacitor C1 and the third capacitor C2 are respectively connected to the live line and the neutral line, and the second common mode inductor L1 is disposed between the second capacitor C1 and the third capacitor C2. In this embodiment, the first EMC filter circuit is a pi-type filter circuit. Further, in the first EMC filter circuit 20, a second discharge resistor R1 is further provided in parallel with the second capacitor C1. The second discharge resistor R1 is used to discharge the second capacitor C1 and the third capacitor C2.
A rectifying-filtering resonant circuit 30 comprising: a current conversion circuit 31, a filter unit 32, and a resonance circuit 33; the filter unit 32 is connected to the current conversion circuit 31 and the resonance circuit 33, respectively. The current converting circuit 31 is used for converting alternating current into direct current. The filter unit 32 includes a differential-mode inductor L2 and a fourth circuit C3, and the filter unit 32 can smooth a direct current. The resonant circuit 33 is the main heating circuit and allows the coil to generate an alternating magnetic field.
The switching power supply circuit 40 includes a switching power supply 41, a bridge rectifier circuit 42, and a second EMC filter circuit 43. The bridge rectifier circuit 42 is a rectifier circuit having 4 diodes D1, D2, D3, and D4. The second EMC filter circuit 43 includes a first capacitor C4 and a first common mode inductor L3, two ends of the first capacitor C4 are respectively connected with the live line and the neutral line, and the first common mode inductor L3 is disposed between the first capacitor C4 and the bridge rectifier circuit 42. Further, the switching power supply circuit 40 further includes a first discharge resistor R2 connected in parallel with the first capacitor C4. The first discharge resistor R2 is used to discharge the first capacitor C4.
The controllable switch circuit 50 comprises a relay RY1, a triode Q1 and a controller; wherein, the switch of the relay RY1 is arranged on a live wire or a zero wire; the triode Q1 is respectively connected with the relay RY1 and the controller; the controller is also connected to a resonant circuit 33 in the rectifying-filtering resonant circuit 30. Specifically, the collector of the transistor Q1 is connected to the relay RY1, the base of the transistor Q1 is connected to the controller, and the emitter of the transistor Q1 is grounded. The controller may be a Micro Control Unit (MCU). Optionally, a resistor R3, a resistor R4, a resistor R5, and a diode D5 as shown in fig. 2 are further provided in the controllable switch circuit 50.
In the specific implementation process, when the induction cooker works, after the controller learns that a user starts the induction cooker, the controller outputs a high level to the triode Q1, so that the triode Q1 is conducted, the relay RY1 is attracted to supply power for the first EMC filter circuit 20 and the rectification filter resonance circuit 30 at the rear stage, and then the controller outputs a signal to the resonance circuit 33 to start heating. When the controller knows that the user is off, the controller firstly closes the resonant circuit 33 to stop heating, and then outputs low level to the triode Q1, so that the triode Q1 is cut off, the relay RY1 is cut off, and the power supply of the first EMC filter circuit 20 and the rectifying and filtering resonant circuit 30 at the rear stage is cut off, so that the aim of reducing standby power is fulfilled.
The present embodiment further provides an induction cooker, including: the low-power standby circuit comprises a panel, a bottom shell and the low-power standby circuit positioned in the bottom shell. The embodiment can ensure that the induction cooker has low power when in standby.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. A low power standby circuit comprising: commercial power input circuit (10), first EMC filter circuit (20), rectification filter resonance circuit (30), its characterized in that still includes: a switching power supply circuit (40) and a controllable switching circuit (50); the switching power supply circuit (40) comprises a switching power supply (41), a bridge rectifier circuit (42) and a second EMC filter circuit (43); wherein,
the switching power supply circuit (40) is arranged upstream of the controllable switching circuit (50), the bridge rectifier circuit (42) is connected with the switching power supply (41) and the second EMC filter circuit (43), respectively, and the second EMC filter circuit (43) is also connected with the mains input circuit (10);
the mains input circuit (10) is further connected with the first EMC filter circuit (20), the first EMC filter circuit (20) is further connected with the rectified wave resonant circuit;
the controllable switch circuit (50) is arranged at the upstream of the first EMC filter circuit (20) and is connected in series with a live wire or a zero wire of the mains supply input circuit (10) and is used for controlling the opening and closing of the first EMC filter circuit (20) and the rectifying and filtering resonant circuit (30).
2. The circuit according to claim 1, wherein the second EMC filter circuit (43) comprises a first capacitor C4 and a first common mode inductor L3, both ends of the first capacitor C4 are connected to the live line and the neutral line, respectively, and the first common mode inductor L3 is disposed between the first capacitor C4 and the bridge rectifier circuit (42).
3. The circuit of claim 2, wherein the switching power supply circuit (40) further comprises a first discharge resistor R2 connected in parallel with the first capacitor C4.
4. The circuit of claim 1, wherein the controllable switch circuit (50) comprises a relay RY1, a transistor Q1, and a controller;
the switch of the relay RY1 is arranged on the live wire or the zero wire;
the triode Q1 is respectively connected with the relay RY1 and the controller;
the controller is also connected with the rectification filter resonance circuit (30).
5. The circuit of claim 4, wherein a collector of the transistor Q1 is connected to the relay RY1, a base of the transistor Q1 is connected to the controller, and an emitter of the transistor Q1 is connected to ground.
6. The circuit according to claim 1, characterized in that the first EMC filter circuit (20) comprises a second capacitance C1, a third capacitance C2 and a second common mode inductance L1, both ends of the second and third capacitances C1 and C2 being connected to the live and neutral wires, respectively, the second common mode inductance L1 being arranged between the second and third capacitances C1 and C2.
7. The circuit of claim 6, further comprising: and the second discharge resistor R1 is connected with the second capacitor C1 in parallel.
8. The circuit according to claim 1, wherein the rectifying-filtering resonant circuit (30) comprises: a current conversion circuit (31), a filter unit (32), and a resonance circuit (33);
the filter unit (32) is connected to the current conversion circuit (31) and the resonance circuit (33), respectively.
9. A circuit according to claim 1, characterized in that the mains input circuit (10) comprises a fuse and a varistor RZ 1;
the fuse is arranged on the live wire, the fuse is arranged on the upstream of the voltage dependent resistor RZ1, and two ends of the voltage dependent resistor RZ1 are respectively connected with the live wire and the zero wire and are arranged on the upstream of the controllable switch circuit (50).
10. An induction cooker, comprising: a panel, a bottom case, and the low power standby circuit of any one of claims 1 to 9 located within the bottom case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620935499.XU CN205946222U (en) | 2016-08-23 | 2016-08-23 | Low-power standby circuit and induction cooker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620935499.XU CN205946222U (en) | 2016-08-23 | 2016-08-23 | Low-power standby circuit and induction cooker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205946222U true CN205946222U (en) | 2017-02-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620935499.XU Expired - Fee Related CN205946222U (en) | 2016-08-23 | 2016-08-23 | Low-power standby circuit and induction cooker |
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| Country | Link |
|---|---|
| CN (1) | CN205946222U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107015513A (en) * | 2017-06-06 | 2017-08-04 | 浙江绍兴苏泊尔生活电器有限公司 | Control circuit, household appliance and power supply method of household appliance |
| CN107947546A (en) * | 2017-12-21 | 2018-04-20 | 中山长虹电器有限公司 | A kind of inexpensive Switching Power Supply EMC filter circuit |
| CN111901914A (en) * | 2019-05-05 | 2020-11-06 | 佛山市顺德区美的电热电器制造有限公司 | Control circuit and method of electromagnetic heating appliance and electromagnetic heating appliance |
-
2016
- 2016-08-23 CN CN201620935499.XU patent/CN205946222U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107015513A (en) * | 2017-06-06 | 2017-08-04 | 浙江绍兴苏泊尔生活电器有限公司 | Control circuit, household appliance and power supply method of household appliance |
| CN107947546A (en) * | 2017-12-21 | 2018-04-20 | 中山长虹电器有限公司 | A kind of inexpensive Switching Power Supply EMC filter circuit |
| CN111901914A (en) * | 2019-05-05 | 2020-11-06 | 佛山市顺德区美的电热电器制造有限公司 | Control circuit and method of electromagnetic heating appliance and electromagnetic heating appliance |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170208 |
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| CF01 | Termination of patent right due to non-payment of annual fee |