CN207304968U - Electromagnetic heating device and control circuit for reducing its standby power consumption - Google Patents

Abstract

The utility model discloses an electromagnetic heating device and control circuit who is used for reducing its stand-by power consumption, wherein, control circuit includes: the controllable switch unit is connected between the input end of the filtering unit and the alternating current power supply; the input end of the first rectifying unit is connected with the input end of the filtering unit, and the output end of the first rectifying unit is respectively connected with the surge detection unit and the voltage detection unit; the controllable switch control circuit is used for controlling the on or off of the controllable switch unit; and the control unit is used for outputting a turn-off signal to the controllable switch control circuit when receiving the standby instruction so as to control the controllable switch unit to be turned off, so that the filtering unit, the rectifier bridge, the first rectifying unit, the surge detection unit and the voltage detection unit are powered off, and the standby power consumption of the electromagnetic heating device can be effectively reduced.

Description

Electromagnetic heating device and control circuit for reducing its standby power consumption

technical field

The utility model relates to the technical field of household appliances, in particular to a control circuit for reducing the standby power consumption of an electromagnetic heating device and an electromagnetic heating device.

Background technique

At present, the circuit schematic diagram of the AC side of the electromagnetic heating device is generally shown in Fig. 1 . As shown in Figure 1, when the electromagnetic heating device is in the standby state, the EMC filter circuit, surge detection circuit, zero-crossing detection circuit and voltage detection circuit composed of filter capacitors and inductors are in the power-on state, and the EMC filter circuit is in the standby state. The power consumption is about 0.1-0.2W, which is generally related to the capacitance of the filter capacitor. The larger the capacitance, the more the standby power consumption. The standby power consumption of the surge detection circuit, zero-crossing detection circuit and voltage detection circuit is about 0.1W.

For electromagnetic heating devices that need to enter the European market, CE (Conformite Europeenne) certification has stricter requirements on standby power consumption. The current solution may have the problem of excessive standby power consumption.

Utility model content

The utility model aims to solve one of the technical problems in the above-mentioned technologies at least to a certain extent.

For this reason, an object of the utility model is to propose a control circuit for reducing the standby power consumption of the electromagnetic heating device, which can control the filter unit, the rectifier bridge, the first rectifier unit, the surge detection The unit and the voltage detection unit are powered off, so that the standby power consumption of the electromagnetic heating device can be effectively reduced.

The second purpose of the utility model is to provide an electromagnetic heating device.

In order to achieve the above purpose, the first aspect of the utility model proposes a control circuit for reducing the standby power consumption of the electromagnetic heating device. The electromagnetic heating device includes a filter unit, a rectifier bridge, a surge detection unit and a voltage detection unit. The output terminal of the filter unit is connected to the rectifier bridge, and the control circuit includes: a controllable switch unit, the controllable switch unit is connected between the input terminal of the filter unit and the AC power supply; the first rectifier unit, The input end of the first rectification unit is connected to the input end of the filter unit, and the output end of the first rectification unit is respectively connected to the surge detection unit and the voltage detection unit; a controllable switch control circuit, The controllable switch control circuit is connected with the controllable switch unit to control the turn on or off of the controllable switch unit; the control unit, the control unit is connected with the controllable switch control circuit, the wave The surge detection unit is connected to the voltage detection unit, and the control unit is used to output a shutdown signal to the controllable switch control circuit when receiving a standby command, so as to control the shutdown of the controllable switch unit, so that all The filtering unit, the rectifying bridge and the first rectifying unit, the surge detecting unit and the voltage detecting unit are powered off.

According to the control circuit for reducing the standby power consumption of the electromagnetic heating device according to the utility model, the shutdown signal can be output to the controllable switch control circuit when the standby command is received, so as to control the shutdown of the controllable switch unit, so that the filter unit, The rectifier bridge, the first rectifier unit, the surge detection unit and the voltage detection unit are powered off, so that the standby power consumption of the electromagnetic heating device can be reduced.

In addition, the control circuit for reducing the standby power consumption of the electromagnetic heating device proposed above according to the utility model may also have the following additional technical features:

Specifically, the controllable switch unit is a relay unit, and the controllable switch control circuit is a relay control circuit, wherein the relay unit includes a switch and a coil, one end of the switch is connected to one end of the AC power supply, The other end of the switch is respectively connected to one input end of the filter unit and one input end of the first rectification unit, and the other input end of the first rectification unit is connected to the other input end of the filter unit After being connected, it is connected to the other end of the AC power supply, one end of the coil is connected to one end of the relay control circuit, the other end of the coil is connected to the other end of the relay control circuit, and the relay control circuit passes Controlling whether the coil is energized controls the closing or opening of the switch.

Specifically, the above-mentioned control circuit for reducing the standby power consumption of the electromagnetic heating device further includes: a second rectification unit, the input end of the second rectification unit is connected to the AC power supply, and the second rectification unit is used for The alternating current provided by the alternating current power supply is rectified and outputs pulsating direct current; a zero-crossing detection unit, one end of the zero-crossing detection unit is connected to the output end of the second rectification unit, and the other end of the zero-crossing detection unit is connected to The control unit is connected, and the zero-crossing detection unit outputs a zero-crossing detection signal to the control unit by detecting the zero-crossing point of the pulsating direct current, so that the control unit is controlled by the controllable switch at the zero-crossing point The unit controls the controllable switch unit to be turned on or off.

Further, the second rectifying unit includes: a first diode and a second diode, the anode of the first diode is connected to one end of the AC power supply, and the anode of the second diode It is connected to the other end of the AC power supply, and the cathode of the first diode is connected to the cathode of the second diode as the output end of the second rectifying unit.

Specifically, the first rectifying unit includes: a third diode and a fourth diode, the anode of the third diode is connected to the other end of the switch, and the anode of the fourth diode It is connected to the other end of the AC power supply, and the cathode of the third diode is connected to the cathode of the fourth diode as the output end of the first rectification unit.

Specifically, the relay control circuit includes: a first resistor, one end of the first resistor is connected to the control unit, a first triode, the base of the first triode is connected to the first resistor The other end of the transistor is connected, the emitter of the first transistor is grounded; the first capacitor is connected between the base and the emitter of the first transistor; the fifth diode, The anode of the fifth diode is respectively connected to the collector of the first triode and one end of the coil, and the cathode of the fifth diode is connected to the other end of the coil; the second resistor , one end of the second resistor is connected to the cathode of the fifth diode, and the other end of the second resistor is connected to a preset power supply.

In order to achieve the above purpose, the second aspect of the utility model provides an electromagnetic heating device, including the control circuit for reducing the standby power consumption of the electromagnetic heating device described in the first aspect of the embodiment of the utility model.

The electromagnetic heating device of the present utility model, through the above-mentioned control circuit for reducing the standby power consumption of the electromagnetic heating device, can output a shutdown signal to the controllable switch control circuit when receiving the standby command, so as to control the controllable switch unit to turn off , so that the filtering unit, the rectifying bridge, the first rectifying unit, the surge detecting unit and the voltage detecting unit are powered off, so that the standby power consumption can be effectively reduced.

Description of drawings

The above and/or additional aspects and advantages of the utility model will become apparent and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, wherein,

Fig. 1 is the circuit principle diagram of the AC side of the electromagnetic heating device in the related art;

Fig. 2 is a schematic block diagram of a control circuit for reducing standby power consumption of an electromagnetic heating device according to an embodiment of the present invention;

3 is a schematic block diagram of a control circuit for reducing standby power consumption of an electromagnetic heating device according to another embodiment of the present invention;

4 is a circuit topology diagram of a relay control circuit according to an embodiment of the present invention; and

Fig. 5 is a flowchart of a control method for reducing standby power consumption of an electromagnetic heating device according to an embodiment of the present invention.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

The control circuit for reducing the standby power consumption of the electromagnetic heating device, the electromagnetic heating device and the control method for reducing the standby power consumption of the electromagnetic heating device according to the embodiments of the present invention will be described below with reference to the accompanying drawings.

Fig. 2 is a schematic block diagram of a control circuit for reducing standby power consumption of an electromagnetic heating device according to an embodiment of the present invention. Wherein, as shown in Figure 2, the electromagnetic heating device includes: a filter unit 10, a rectifier bridge 20, a surge detection unit 30 and a voltage detection unit 40, the output end of the filter unit 10 is connected to the rectifier bridge 20; the control circuit includes: The switch unit 50 , the first rectification unit 60 , the controllable switch control circuit 70 and the control unit 80 .

Wherein, the controllable switch unit 50 is connected between the input terminal of the filter unit 10 and the AC power supply AC. The input end of the first rectification unit 60 is connected to the input end of the filter unit 10 , and the output end of the first rectification unit 60 is respectively connected to the surge detection unit 30 and the voltage detection unit 40 . The controllable switch control circuit 70 is connected with the controllable switch unit 50 to control the turn-on or turn-off of the controllable switch unit 50 . The control unit 80 is connected to the controllable switch control circuit 70, the surge detection unit 30 and the voltage detection unit 40 respectively, and the control unit 80 is used to output a shutdown signal to the controllable switch control circuit 70 when receiving a standby command, so as to control the The control switch unit 50 is turned off, so that the filter unit 10, the rectifier bridge 20, the first rectifier unit 60, the surge detection unit 30 and the voltage detection unit 40 are powered off.

Specifically, the filtering unit 10 may be composed of a capacitor and an inductor, and the filtering unit 10 may filter the alternating current output by the alternating current power source AC, so as to remove the peak pulse in the waveform. The first rectifying unit 60 can rectify the alternating current output by the alternating current power supply AC to output pulsating direct current, and the surge detection unit 30 can detect the pulsating direct current output by the first rectifying unit 60 in real time and generate a surge signal to judge the AC power Whether AC surge voltage or surge current occurs, the voltage detection unit 40 can detect the pulsating direct current output by the first rectification unit 60 in real time and generate a voltage signal to determine whether the AC power supply AC has overvoltage. The control unit 80 can control the electromagnetic heating device according to the surge signal and the voltage signal. For example, when the control unit 80 judges that the AC power supply AC has a surge voltage or a surge current according to the surge signal, it controls the electromagnetic heating device to trigger the surge protection. The control unit 80 judges the overvoltage of the AC power supply AC according to the voltage signal, and then controls the electromagnetic heating device to trigger the overvoltage protection. Moreover, the control unit 80 can also output a shutdown signal to the controllable switch control circuit 70 when receiving the standby command, and the switch control circuit 70 can control the controllable switch unit 50 to turn off when receiving the shutdown signal, so that the filter The unit 10, the rectifier bridge 20, the first rectifier unit 60, the surge detection unit 30 and the voltage detection unit 40 are powered off, which greatly reduces the standby power consumption of the electromagnetic heating device.

Further, in an embodiment of the present utility model, as shown in FIG. 3 , the controllable switch unit 50 may be a relay unit, and the controllable switch control circuit 70 is a relay control circuit, wherein the relay unit includes a switch K and a coil L, One end of the switch K is connected to one end of the AC power supply AC, and the other end of the switch K is respectively connected to an input end of the filter unit 10 and an input end of the first rectification unit 60, and the other input end of the first rectification unit 60 is connected to the filter The other input end of the unit 10 is connected to the other end of the alternating current power supply AC, and one end of the coil L is connected to one end of the relay control circuit 70, and the other end of the coil L is connected to the other end of the relay control circuit 70, and the relay control circuit 70 The closing or opening of the switch K is controlled by controlling whether the coil L is energized.

Specifically, when the coil L is energized, K is closed, and when the coil L is de-energized, K is opened. The control unit 80 can control whether the switch K is turned on or off by controlling whether the controllable switch control circuit 70 is turned on and whether the coil L is powered on.

According to an embodiment of the present invention, as shown in FIG. 3 , the control circuit for reducing the standby power consumption of the electromagnetic heating device may further include: a second rectification unit 90 and a zero-crossing detection unit 100 .

Wherein, the input terminal of the second rectifying unit 90 is connected to the AC power supply AC, and the second rectifying unit 90 is used for rectifying the alternating current provided by the alternating current power supply AC and outputting the pulsating direct current. One end of the zero-crossing detection unit 100 is connected to the output end of the second rectification unit 90, and the other end of the zero-crossing detection unit 100 is connected to the control unit 80. The zero-crossing detection unit 100 outputs a zero-crossing detection signal by detecting the zero-crossing point of the pulsating direct current to the control unit 80, so that the control unit 80 controls the controllable switch unit 80 to turn on or off through the controllable switch control unit 70 at the zero crossing point.

Specifically, if the shrapnel at the high-voltage end of the relay closes or disconnects suddenly when it is not at the zero point of the sine wave, there will be hazards such as ignition and arcing, and there are certain potential safety hazards. Therefore, the zero-crossing detection unit 100 can output a zero-crossing detection signal to the control unit 80 by detecting the zero-crossing point of the pulsating direct current. When K needs to be turned on or off, the control unit 80 can control K at the zero-crossing point according to the zero-crossing signal. on or off. Therefore, not only the service life of the relay unit can be improved, but also the safety of the circuit can be improved.

Further, according to an embodiment of the present invention, as shown in FIG. 3 , the second rectification unit 90 may include: a first diode D1 and a second diode D2, and the anode of the first diode D1 is connected to the AC One end of the power supply AC is connected, the anode of the second diode D2 is connected to the other end of the AC power supply AC, and the cathode of the first diode D1 is connected to the cathode of the second diode D2 as the output of the second rectification unit 90 end.

As shown in FIG. 3, the first rectifying unit 60 may include: a third diode D3 and a fourth diode D4, the anode of the third diode D3 is connected to the other end of the switch K, and the fourth diode D4 The anode of the diode D3 is connected to the other end of the AC power supply AC, and the cathode of the third diode D3 is connected to the cathode of the fourth diode D4 as the output terminal of the first rectifying unit 60 .

Specifically, the first rectification unit 60 may perform full-wave rectification on the alternating current output from the alternating current power source AC, and then output the pulsating direct current to the surge detection unit 30 and the voltage detection unit 40 . The second rectification unit 90 can perform full-wave rectification on the alternating current output from the alternating current power supply AC, and then output the pulsating direct current to the zero-crossing detection unit 100 .

In the present utility model, as shown in FIG. 3 , a fuse R can also be provided between the other input end of the filter unit 10 and the other end of the AC power supply AC, and the fuse R can be blown when the circuit is overcurrent, so as to The control circuit is powered off to improve safety.

According to an embodiment of the present invention, as shown in Figure 4, the relay control circuit, that is, the controllable switch control circuit 70 may include: a first resistor R1, a first triode Q1, a first capacitor C1, a fifth diode D5 and the second resistor R2.

Wherein, one end of the first resistor R1 is connected to the control unit 80 . The base of the first transistor Q1 is connected to the other end of the first resistor R1, and the emitter of the first transistor Q1 is grounded. The first capacitor C1 is connected between the base and the emitter of the first transistor Q1. The anode of the fifth diode D5 is respectively connected to the collector of the first triode Q1 and one end of the coil L, and the cathode of the fifth diode D5 is connected to the other end of the coil L. One end of the second resistor R2 is connected to the cathode of the fifth diode D5, and the other end of the second resistor R2 is connected to the preset power supply VCC. Wherein, the size of the preset power supply VCC can be preset according to actual conditions.

Specifically, as shown in FIG. 4 , the first resistor R1 can limit the current, and the fifth diode D5 is a freewheeling diode, which can inhibit the absorption of back electromotive force. When it is necessary to control K to close, the control unit 80 can output a high-level signal to the base of the first transistor Q1 through R1. When the base of Q1 is high, Q1 is turned on, the coil L is powered on, and K is closed. When it is necessary to control KD to be disconnected, the control unit 80 can output a low-level signal to the base of the first transistor Q1 through R1. When the base of Q1 is at a low level, Q1 is turned off, the coil L loses power, and K is disconnected. .

It can be understood that, in the implementation of the present utility model, the electromagnetic heating device may be an electromagnetic oven.

In summary, according to the control circuit for reducing the standby power consumption of the electromagnetic heating device according to the embodiment of the utility model, the electromagnetic heating can be controlled according to the surge signal detected by the surge detection unit and the voltage signal of the AC power source detected by the voltage detection unit. The device is controlled, and when the standby command is received, the shutdown signal is output to the controllable switch control circuit to control the shutdown of the controllable switch unit, so that the filter unit, the rectifier bridge and the first rectifier unit, the surge detection unit and the voltage The detection unit is powered off, so that the standby power consumption of the electromagnetic heating device can be effectively reduced. Moreover, the control unit can control the controllable switch unit to be turned on or off at the zero-crossing point according to the zero-crossing signal, which can not only improve the service life of the relay unit, but also improve the safety of the circuit.

The embodiment of the utility model also proposes an electromagnetic heating device, which includes the above-mentioned control circuit for reducing the standby power consumption of the electromagnetic heating device.

The electromagnetic heating device of the embodiment of the present invention can be controlled according to the surge signal detected by the surge detection unit and the voltage signal of the AC power source detected by the voltage detection unit through the above-mentioned control circuit for reducing the standby power consumption of the electromagnetic heating device , and output a shutdown signal to the controllable switch control circuit when receiving the standby command, so as to control the shutdown of the controllable switch unit, so that the filter unit, the rectifier bridge and the first rectifier unit, the surge detection unit and the voltage detection unit are disconnected power, which can effectively reduce standby power consumption.

Based on the above electromagnetic heating device, the embodiment of the present invention also proposes a control method for reducing the standby power consumption of the electromagnetic heating device.

Fig. 5 is a flowchart of a control method for reducing standby power consumption of an electromagnetic heating device according to an embodiment of the present invention. As shown in Figure 5, the control method may include the following steps:

S1, judging whether a standby instruction is received.

S2, if the standby instruction is received, output a shut-off signal to the controllable switch control circuit to control the shut-off of the controllable switch unit, so that the filter unit, the rectifier bridge and the first rectifier unit, the surge detection unit and the voltage detection The unit is powered off.

Specifically, when the standby command is received, the shutdown signal is output to the controllable switch control circuit, and the switch control circuit can control the controllable switch unit to turn off when receiving the shutdown signal, so that the filter unit, the rectifier bridge and the first The rectification unit, the surge detection unit and the voltage detection unit are powered off, which greatly reduces the standby power consumption of the electromagnetic heating device.

According to an embodiment of the present invention, the control method for reducing the standby power consumption of the electromagnetic heating device may further include: detecting the zero-crossing point of the AC power supply, so as to control the controllable switch according to the zero-crossing point of the AC power supply when receiving the standby instruction Unit shuts down.

Specifically, if the shrapnel at the high-voltage end of the relay closes or disconnects suddenly when it is not at the zero point of the sine wave, there will be hazards such as ignition and arcing, and there are certain potential safety hazards. Therefore, the zero-crossing signal can be output by the zero-crossing detection unit, and when the controllable switch unit needs to be turned on or off, the controllable switch unit can be controlled to turn on or off at the zero-crossing point according to the zero-crossing signal. Therefore, not only the service life of the controllable switch unit can be improved, but also the safety of the circuit can be improved.

In an embodiment of the present invention, as shown in Figure 3, the controllable switch unit can be a relay unit, and the controllable switch control circuit is a relay control circuit, wherein the relay unit includes a switch and a coil, and one end of the switch is connected to the AC power supply. One end of the switch is connected, the other end of the switch is respectively connected to one input end of the filter unit and one input end of the first rectification unit, and the other input end of the first rectification unit is connected to the other input end of the filter unit and then connected to the AC power supply. On the other end, one end of the coil is connected to one end of the relay control circuit, and the other end of the coil is connected to the other end of the relay control circuit. The relay control circuit controls whether the coil is energized to control the closing or opening of the switch.

Specifically, when the coil is energized, the switch is closed, and when the coil is de-energized, the switch is opened. By controlling whether the controllable switch controls whether the circuit is turned on and whether the coil is powered on, the closing or opening of the switch can be controlled.

It should be noted that the control method for reducing the standby power consumption of the electromagnetic heating device described in the embodiment of the present invention is based on the electromagnetic heating device described in the above-mentioned embodiment. For details not disclosed in this embodiment, please refer to the above-mentioned Embodiment, in order to reduce redundancy, details are not repeated here.

To sum up, according to the control method for reducing the standby power consumption of the electromagnetic heating device according to the embodiment of the present utility model, when receiving the standby command, the shutdown signal can be output to the controllable switch control circuit to control the controllable switch unit to turn off. The filter unit, the rectifier bridge, the first rectifier unit, the surge detection unit and the voltage detection unit are powered off, so that the standby power consumption of the electromagnetic heating device can be reduced. Moreover, the controllable switch unit can be controlled to be turned on or off at the zero-cross point according to the zero-cross signal, which can not only improve the service life of the controllable switch unit, but also improve the safety of the circuit.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial ", "radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying No device or element must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present utility model, "plurality" means two or more, unless otherwise specifically defined.

In this utility model, unless otherwise specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connection, or integration; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first feature and the second feature through an intermediary indirect contact. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structures, materials or features are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and should not be construed as limitations of the present invention, and those skilled in the art are within the scope of the present invention. Variations, modifications, substitutions and variations can be made to the above-described embodiments.

Claims (7)

1. A kind of 1. control circuit for being used to reduce electromagnetic heater stand-by power consumption, it is characterised in that the electromagnetic heater Including filter unit, rectifier bridge, surge detection unit and voltage detection unit, the output terminal of the filter unit and the rectification Bridge is connected, and the control circuit includes：

   Controllable switch unit, the controllable switch unit are connected between input terminal and the AC power of the filter unit；

   First rectification unit, the input terminal of first rectification unit are connected with the input terminal of the filter unit, and described first The output terminal of rectification unit is connected with the surge detection unit and the voltage detection unit respectively；

   Controllable switch control circuit, the controllable switch control circuit are connected described controllable to control with the controllable switch unit The on or off of switch element；

   Control unit, described control unit respectively with the controllable switch control circuit, the surge detection unit and the electricity Pressure detection unit is connected, and described control unit is exporting cut-off signals when receiving standby command to the controllable switch control Circuit processed, to control the controllable switch unit to turn off, so that the filter unit, the rectifier bridge and first rectification Unit, the surge detection unit and voltage detection unit power-off.
2. 2. the control circuit as claimed in claim 1 for being used to reduce electromagnetic heater stand-by power consumption, it is characterised in that described Controllable switch unit is relay unit, and the controllable switch control circuit is control relay circuit, wherein, the relay Unit includes switch and coil, one end of the switch are connected with one end of the AC power, the other end point of the switch It is not connected with an input terminal of the filter unit and an input terminal of first rectification unit, the first rectification list Another input terminal of member is connected to the other end of the AC power after being connected with another input terminal of the filter unit, One end of the coil is connected with one end of the control relay circuit, and the other end of the coil is controlled with the relay The other end of circuit is connected, and whether the control relay circuit is by controlling the coil to be powered to control closing for the switch Close or disconnect.
3. 3. the control circuit as claimed in claim 1 or 2 for being used to reduce electromagnetic heater stand-by power consumption, it is characterised in that Further include：

   Second rectification unit, the input terminal of second rectification unit are connected with the AC power, second rectification unit Alternating current to provide the AC power carries out rectification, and output ripple direct current；

   Zero passage detection unit, one end of the zero passage detection unit are connected with the output terminal of second rectification unit, the mistake The other end of zero detection unit is connected with described control unit, and the zero passage detection unit is by detecting the Rectified alternating current Zero crossing to export zero passage detection signal to described control unit, so as to described control unit the zero crossing by it is described can Control switch control unit and control the controllable switch unit on or off.
4. 4. the control circuit as claimed in claim 3 for being used to reduce electromagnetic heater stand-by power consumption, it is characterised in that described Second rectification unit includes：First diode and the second diode, anode and the AC power of first diode One end is connected, and the anode of second diode is connected with the other end of the AC power, the cathode of first diode Output terminal after being connected with the cathode of second diode as second rectification unit.
5. 5. the control circuit as claimed in claim 2 for being used to reduce electromagnetic heater stand-by power consumption, it is characterised in that described First rectification unit includes：3rd diode and the 4th diode, the anode of the 3rd diode are another with the switch End be connected, the anode of the 4th diode is connected with the other end of the AC power, the cathode of the 3rd diode and Output terminal as first rectification unit after the cathode of 4th diode is connected.
6. 6. the control circuit as claimed in claim 2 for being used to reduce electromagnetic heater stand-by power consumption, it is characterised in that described Control relay circuit includes：

   First resistor, one end of the first resistor are connected with described control unit,

   First triode, the base stage of first triode are connected with the other end of the first resistor, first triode Emitter ground connection；

   First capacitance, first capacitance connection is between the base stage of first triode and emitter；

   5th diode, the anode of the 5th diode respectively with the collector of first triode and the coil one End is connected, and the cathode of the 5th diode is connected with the other end of the coil；

   Second resistance, one end of the second resistance are connected with the cathode of the 5th diode, the second resistance it is another End is connected with default power supply.
7. A kind of 7. electromagnetic heater, it is characterised in that including as any one of claim 1-6 be used for reduce electromagnetism The control circuit of heating unit stand-by power consumption.