CN111092545B - Impulse current suppression device - Google Patents
Impulse current suppression device Download PDFInfo
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- CN111092545B CN111092545B CN201911343400.1A CN201911343400A CN111092545B CN 111092545 B CN111092545 B CN 111092545B CN 201911343400 A CN201911343400 A CN 201911343400A CN 111092545 B CN111092545 B CN 111092545B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
Abstract
The embodiment of the invention discloses an impulse current suppression device, which comprises: the device comprises an impulse current suppression module, a transformer and a magnetron; the impact current suppression module is positioned in a first loop where a first coil of the transformer is positioned; the magnetron is positioned in a second loop where a second coil of the transformer is positioned; the surge current suppression module includes: a current limiting module, a temperature controller and a heating device; the current limiting module is connected with the temperature controller in parallel; the heating device is connected in series with the current limiting module and the temperature controller which are connected in parallel; the heating device generates heat under the action of current; the current limiting module is used for limiting the impulse current generated when the magnetron is conducted; the temperature controller is used for detecting the ambient temperature and controlling the temperature controller to be in a disconnected state or a connected state based on the ambient temperature; wherein the ambient temperature is related to heat generated by the heat generating device.
Description
Technical Field
The invention relates to the field of household appliances, in particular to an impulse current suppression device.
Background
At present, a microwave oven boosts voltage through a power frequency transformer to supply power to a magnetron, the output power of the magnetron is high, generally between 500W and 1000W, in the actual use process, the magnetron can be switched on and off for many times during the microwave working period according to different heating firepower, and when the magnetron is switched on, larger impact current exists. At present, the general scheme of the microwave oven is to add a slow-start circuit at the primary of a transformer to solve the problem, and the slow-start circuit is mainly realized by the following scheme: the first scheme is that a filter plate is added, the core is that a current limiting resistor is added when a magnetron is started, and when a transformer is sufficiently magnetized, the current limiting resistor is cut off through a relay; and in the second scheme, the current is limited through a negative temperature coefficient thermistor.
However, a relay power supply circuit needs to be added through relay control, the control mode is complex, a filter plate needs to be added, and the cost and the manufacturing process are increased; the current is limited only by the negative temperature coefficient thermistor, so that the recovery time of the resistor is long, the resistor cannot recover when repeatedly switched, the current limiting effect is invalid, the resistance value of the thermistor cannot be small enough when the thermistor works, and the power consumption of a product is increased. How to solve the problem has no effective solution at present.
Disclosure of Invention
In view of the above, embodiments of the present invention are directed to providing a rush current suppression device.
The technical embodiment of the invention is realized as follows:
an embodiment of the present invention provides an inrush current suppression device, including: the device comprises an impulse current suppression module, a transformer and a magnetron; the impact current suppression module is positioned in a first loop where a first coil of the transformer is positioned; the magnetron is positioned in a second loop where a second coil of the transformer is positioned;
the surge current suppression module includes: a current limiting module, a temperature controller and a heating device; the current limiting module is connected with the temperature controller in parallel; the heating device is connected in series with the current limiting module and the temperature controller which are connected in parallel; the heating device generates heat under the action of current; the current limiting module is used for limiting the impulse current generated when the magnetron is conducted;
the temperature controller is used for detecting the ambient temperature and controlling the temperature controller to be in a disconnected state or a connected state based on the ambient temperature; wherein the ambient temperature is related to heat generated by the heat generating device.
In the above scheme, the temperature controller is configured to control itself to be in a disconnected state when the ambient temperature is less than a preset temperature threshold; and controlling the self to be in a conducting state under the condition that the ambient temperature is greater than or equal to the preset temperature threshold.
In the above scheme, the power of the heat generating device is related to the parameter of the temperature controller.
In the above scheme, the heating device is close to the temperature sensing part of the temperature controller.
In the above scheme, the current limiting module includes a current limiting resistor or a negative temperature coefficient thermistor.
In the above scheme, the current limiting module is far away from the heat generating device when the current limiting module is a negative temperature coefficient thermistor.
In the above scheme, the heating device is further configured to generate heat continuously under the action of current when the temperature controller is in the on state, and the generated heat is used to maintain the ambient temperature required by the temperature controller to maintain the on state.
In the above scheme, when the current limiting module is a negative temperature coefficient thermistor and the temperature controller is in a conducting state, the resistance value of the negative temperature coefficient thermistor increases along with the reduction of the temperature.
In the above scheme, the temperature controller is a bimetallic strip temperature controller.
In the above scheme, the resistance value of the heating device is smaller than a preset threshold value.
The embodiment of the invention also provides microwave oven equipment which comprises any one of the devices.
The embodiment of the invention provides an impulse current suppression device, which comprises: the device comprises an impulse current suppression module, a transformer and a magnetron; the impact current suppression module is positioned in a first loop where a first coil of the transformer is positioned; the magnetron is positioned in a second loop where a second coil of the transformer is positioned; the surge current suppression module includes: a current limiting module, a temperature controller and a heating device; the current limiting module is connected with the temperature controller in parallel; the heating device is connected in series with the current limiting module and the temperature controller which are connected in parallel; the heating device generates heat under the action of current; the current limiting module is used for limiting the impulse current generated when the magnetron is conducted; the temperature controller is used for detecting the ambient temperature and controlling the temperature controller to be in a disconnected state or a connected state based on the ambient temperature; wherein the ambient temperature is related to heat generated by the heat generating device. By adopting the technical scheme of the embodiment of the invention, the impact current suppression module comprises: a current limiting module, a temperature controller and a heating device; the temperature controller is used for detecting the ambient temperature and controlling the temperature controller to be in a disconnected state or a connected state based on the ambient temperature; under the condition that the temperature controller is in an off state, the current limiting module limits the impact current generated when the magnetron is switched on; under the condition that the temperature controller is in a conducting state, the current limiting module is in a short circuit state, and the power consumption of the device is reduced; the impact current suppression module is convenient to install, simple in manufacturing process and low in cost.
Drawings
Fig. 1 is a schematic diagram of an inrush current suppression device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another inrush current suppression device according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an inrush current suppression module in an inrush current suppression device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following describes specific technical solutions of the present invention in further detail with reference to the accompanying drawings in the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Fig. 1 is a schematic diagram of an impulse current suppression device according to an embodiment of the present invention; FIG. 2 is a schematic diagram of another inrush current suppression device according to an embodiment of the present invention; fig. 3 is a schematic diagram of an inrush current suppression module in an inrush current suppression device according to an embodiment of the present invention; as will be illustrated below with reference to fig. 1, 2 and 3, the apparatus 10 comprises: a rush current suppression module 101, a transformer 102 and a magnetron 103; the inrush current suppression module 101 is located in a first loop in which a first coil 1021 of the transformer 102 is located; the magnetron 103 is located in the second loop of the second coil 1022 of the transformer 102;
the inrush current suppression module 101 includes: a current limiting module 1011, a temperature controller 1012 and a heating device 1013; the current limiting module 1011 and the temperature controller 1012 are connected in parallel; the heating device 1013 is connected in series with the current limiting module 1011 and the temperature controller 1012 connected in parallel; the heat generating device 1013 generates heat under the action of current; the current limiting module 1011 is configured to limit an impulse current generated when the magnetron 103 is turned on;
the temperature controller 1012 is configured to detect an ambient temperature, and control the self to be in an off state or an on state based on the ambient temperature; wherein the ambient temperature is related to the heat generated by the heat generating device 1013.
It should be noted that the inrush current suppression device proposed in this embodiment can be applied to a microwave oven apparatus.
In this embodiment, the transformer 102 may be any transformer, and is not limited herein. As an example, the transformer 102 may be a power frequency transformer.
The magnetron 103 may be an electric vacuum device for generating microwave energy. As an example, the magnetron 103 may be a diode placed in a constant magnetic field, and electrons in the tube interact with a high-frequency electromagnetic field under the control of the constant magnetic field and the constant electric field perpendicular to each other to convert energy obtained from the constant electric field into microwave energy, thereby achieving the purpose of generating the microwave energy. The microwave oven equipment can boost the voltage through the transformer 102 to supply power to the magnetron 103, and the magnetron 103 can output power. The magnetron 103 is generally turned on and off several times during the operation of the microwave oven, and a large inrush current is generated at the moment when the magnetron 103 is turned on. In practical applications, the on and off of the magnetron 103 may be controlled by a switch, which may be any switch, but is not limited thereto, and as an example, the switch may be a timing switch.
The inrush current suppression module 101 is located in a first loop in which a first coil 1021 of the transformer 102 is located; the magnetron 103 is located in the second loop of the second coil 1022 of the transformer 102; the first coil 1021 can be a primary coil or a primary coil connected with a power supply, and the power supply can be an alternating current power supply; the second coil 1022 may be a secondary coil or a secondary coil connected to an electrical appliance, and the electrical appliance may be a load. The first loop is a loop circuit formed by the first coil 1021 of the transformer 102 and the inrush current suppression module 101, and the second loop is a loop circuit formed by the second coil 1022 of the transformer 102 and the magnetron 103.
For convenience of understanding, fig. 1 and 2 are combined to understand, and fig. 1 shows a first loop circuit formed by the first coil 1021 of the transformer 102 and the inrush current suppression module 101, and a second loop circuit formed by the second coil 1022 of the transformer 102 and the magnetron 103. In fig. 2, a first loop circuit consisting of the first coil 1021 of the transformer 102, the inrush current suppression module 101 and a power supply, and a second loop circuit consisting of the second coil 1022 of the transformer 102, the magnetron 103 and a switch are shown; wherein the power supply can supply power to the first loop; the switch can control the magnetron 103 to be switched on and off; the power output by the magnetron 103 is supplied to the load.
The inrush current suppression module 101 includes: a current limiting module 1011, a temperature controller 1012 and a heating device 1013; the current limiting module 1011 may include at least a resistive device, which may be any resistive device, but is not limited thereto, and as an example, the resistive device may be a current limiting resistor or a negative temperature coefficient thermistor, etc.
The temperature controller 1012 may be understood as a series of automatic control devices that are physically deformed inside a switch according to a temperature change of a working environment to generate some special effects and generate on or off actions, which are also called as a temperature control switch, a temperature protector, and a temperature controller, and is referred to as a temperature controller for short, and the temperature controller 1012 may be any temperature control device, which is not limited herein. As an example, the thermostat 1012 may be a normally-open bimetallic thermostat.
The heat generating device 1013 may be any heat generating device, and is not limited herein. As an example, the heat generating device 1013 may be a heat generating wire or a heat generating resistor.
The heat generating device 1013 generates heat under the action of current, which means that the heat generating device 1013 operates to generate heat when current flows through the heat generating device 1013.
The current limiting module 1011 is configured to limit an impulse current generated when the magnetron 103 is turned on, where the impulse current generated when the magnetron 103 is turned on flows through the current limiting module 1011, and since the current limiting module 1011 includes a resistive device, a resistance in a turn-on circuit is increased, a current in the turn-on circuit is decreased, and thus the impulse current generated when the magnetron 103 is turned on is limited.
In this embodiment, the correlation between the ambient temperature and the heat generated by the heat generating device 1013 may be understood as determining the ambient temperature according to the heat generated by the heat generating device 1013, and in general, the more the heat generated by the heat generating device 1013 is, the higher the ambient temperature is; the less heat is generated by the heat generating device 1013, the lower the ambient temperature is.
The temperature controller 1012 is configured to detect an ambient temperature, and control the self to be in an off state or an on state based on the ambient temperature; the control of the self-disconnection state or the conduction state based on the ambient temperature can be realized by comparing the ambient temperature with a preset temperature threshold value to obtain a comparison result, and the self-disconnection state can be controlled under the condition that the comparison result represents that the ambient temperature is smaller than the preset temperature threshold value; and controlling the self to be in a conducting state under the condition that the comparison result represents that the ambient temperature is greater than or equal to the preset temperature threshold value. The preset temperature threshold may be determined according to actual conditions, and is not limited herein.
In an optional embodiment of the present invention, the temperature controller 1012 is configured to control itself to be in an off state when the ambient temperature is less than a preset temperature threshold; and controlling the self to be in a conducting state under the condition that the ambient temperature is greater than or equal to the preset temperature threshold.
In this embodiment, the preset temperature threshold may be determined according to an actual situation, and is not limited herein. As an example, the preset temperature threshold may be an operation temperature value of the thermostat 1012, and the operation temperature value may be 75 ℃.
For convenience of understanding, the example is described with reference to fig. 2, and assuming that the preset temperature threshold is 75 ℃, in fig. 2, the first circuit is provided with a power supply, and the second circuit is provided with a switch; under the condition that the switch starts to be in a conducting state, the magnetron 103 starts to work, the heating device 1013 starts to generate heat under the action of current, because the heat generated by the heating device 1013 is less at the moment, the ambient temperature reflected by the heat is lower, the ambient temperature detected by the temperature controller 1012 is less than 75 ℃, the temperature controller 1012 controls the temperature controller to be in a disconnected state, and the current provided by the power supply passes through the heating device 1013 and the current limiting module 1011; so that the current limiting module 1011 limits the rush current generated when the magnetron 103 is turned on; in the process that the switch is always in the on state, the heat generated by the heat generating device 1013 under the action of current is gradually increased, the heat reflects that the ambient temperature is gradually increased, and when the ambient temperature detected by the temperature controller 1012 is greater than or equal to 75 ℃, the temperature controller 1012 controls the temperature to be in the on state, the current provided by the power supply passes through the heat generating device 1013 and the temperature controller 1012, and the current limiting module 1011 is short-circuited; as an example, in the process, the thermostat 1012 may be configured as a normally-open bimetallic temperature-controlled switch, and the heating device 1013 may be configured as a heating wire, whose resistance may be set small enough to ensure that excessive extra power consumption is not added as much as possible when the process is working normally; when the switch is in the off state, no current flows through the heat generating device, the ambient temperature starts to decrease, and when the thermostat 1012 detects that the ambient temperature is less than 75 ℃, the thermostat 1012 returns to the off state.
In an alternative embodiment of the present invention, the power of the heat generating device 1013 is related to the parameters of the thermostat 1012.
In this embodiment, when the temperature controller 1012 is closed, it is necessary to ensure that the heat generating device 1013 generates heat under the action of current so as to maintain the temperature required when the temperature controller 1012 is closed, the heat generated by the heat generating device 1013 under the action of current may be determined by the power of the heat generating device 1013, and the temperature required when the temperature controller 1012 is closed may be determined by parameters of the temperature controller 1012, such as temperature control characteristic, temperature control range, and temperature control accuracy, so that the power of the heat generating device 1013 needs to be selected according to the parameters of the temperature controller 1012, that is, the power of the heat generating device 1013 is associated with the parameters of the temperature controller 1012. Generally, the higher the temperature required when the temperature controller 1012 is closed, the higher the power of the heat generating device 1013 is; the lower the temperature required when the temperature controller 1012 is closed, the lower the power of the heat generating device 1013.
In an alternative embodiment of the present invention, the heat generating device 1013 is close to the temperature sensing part of the temperature controller 1012.
In this embodiment, the temperature sensing portion of the thermostat 1012 may be a position where a temperature sensing element of the thermostat 1012 is located, and the position may be determined according to a specific structure of the thermostat 1012, which is not limited herein. As an example, in the case where the thermostat 1012 is a normally-open bimetal thermostat, the temperature sensing portion of the thermostat 1012 may be a metal spring.
The heating device 1013 is close to the temperature sensing part of the temperature controller 1012, so that the temperature controller 1012 can rapidly detect the ambient temperature embodied by the heat generated by the heating device 1013, and further when the temperature controller 1012 is closed, the heating device 1013 generates heat under the action of current to better maintain the temperature required when the temperature controller 1012 is closed, and the heat generated by the heating device 1013 is reduced.
For convenience of understanding, the temperature sensing part of the thermostat 1012, which is indicated by 11 in fig. 3, may be a metal spring, and the metal spring is close to the heat generating device 1013. The metal spring can sensitively detect the ambient temperature reflected by the heat generated by the heat generating device 1013, and when the heat generating device 1013 is close to the metal spring, the metal spring can accurately detect the ambient temperature reflected by the heat generated by the heat generating device 1013, so as to reduce the heat loss generated by the heat generating device 1013 due to the distance between the heat generating device 1013 and the temperature sensing part of the temperature controller 1012.
In an alternative embodiment of the present invention, the current limiting module 1011 includes a current limiting resistor or a ntc thermistor.
In this embodiment, the current limiting resistor may be any resistor, and is not limited herein. The negative temperature coefficient thermistor is also called an NTC thermistor, and the resistance value of the negative temperature coefficient thermistor decreases with the increase of temperature and increases with the decrease of temperature.
In an alternative embodiment of the present invention, in a case that the current limiting module 1011 is a negative temperature coefficient thermistor, the current limiting module 1011 is far away from the heat generating device 1013.
In this embodiment, the distance between the current limiting module 1011 and the heating device 1013 may be determined according to an actual condition, where the actual condition may be that the ambient temperature of the heating device 1013 generating heat under the action of current does not affect the temperature of the ntc thermistor, so that when the temperature controller 1012 is in a conduction state, the ntc thermistor is short-circuited, and the resistance of the ntc thermistor gradually recovers along with the decrease of the temperature. That is, the current limiting module 1011 is far away from the heating device 1013 to avoid affecting the normal recovery of the resistance of the ntc thermistor, so as to ensure that the resistance of the ntc thermistor can be recovered when the temperature controller 1012 is closed.
In an optional embodiment of the present invention, the heat generating device 1013 is further configured to generate heat under the action of the current continuously when the thermostat 1012 is in the conducting state, and the generated heat is used to maintain the ambient temperature required by the thermostat 1012 to maintain the conducting state.
In this embodiment, when the temperature controller 1012 is in the on state, the heat generating device 1013 may generate heat continuously under the action of current, the heat may maintain the ambient temperature required by the temperature controller 1012 to maintain the on state, in order to better realize that the heat maintains the ambient temperature required by the temperature controller 1012 to maintain the on state, a parameter of the heat generating device 1013 may be associated with a parameter of the temperature controller 1012, specifically, the parameter of the heat generating device 1013 may be selected according to the parameter of the temperature controller 1012, and as an example, a power parameter of the heat generating device 1013 may be selected according to the parameter of the temperature controller 1012 when the temperature controller 1012 is in the on state.
In an optional embodiment of the present invention, when the current limiting module 1011 is a ntc thermistor, and when the temperature controller 1012 is in a conducting state, the resistance of the ntc thermistor increases with the decrease of the self temperature.
In the present embodiment, the resistance value of the negative temperature coefficient thermistor generally decreases as its temperature increases, and increases as its temperature decreases. When the current limiting module 1011 is a ntc thermistor and the temperature controller 1012 is in a conducting state, the ntc thermistor is short-circuited, almost no current flows through the ntc thermistor, and no heat is generated, and as the conducting time of the temperature controller 1012 increases, the temperature of the ntc thermistor gradually decreases, and the resistance of the ntc thermistor gradually increases, so that the resistance of the ntc thermistor gradually recovers.
In an alternative embodiment of the present invention, the thermostat 1012 is a bimetallic thermostat.
In this embodiment, the bimetallic strip temperature controller may be made by pressing two metals having different thermal expansion coefficients, and at different temperatures, the deformation difference of the two metals causes the bimetallic strip to bend, and the deformation may push the switch contact to be closed or opened, and the switch contact may be a metal spring.
In an alternative embodiment of the present invention, the resistance of the heat generating device 1013 is smaller than a predetermined threshold.
In this embodiment, the preset threshold may be determined according to an actual situation, and is not limited herein. As an example, the preset threshold may be a maximum resistance value corresponding to a resistance value of the heat generating device 1013 generating heat under the action of current to ensure that the apparatus 10 operates normally.
The embodiment of the invention also provides microwave oven equipment which comprises any one of the devices.
In this embodiment, reference may be made to the description in any of the above-mentioned apparatuses, which is not described herein again.
The invention provides an inrush current suppression device, wherein the inrush current suppression module comprises: a current limiting module, a temperature controller and a heating device; the temperature controller is used for detecting the ambient temperature and controlling the temperature controller to be in a disconnected state or a connected state based on the ambient temperature; under the condition that the temperature controller is in an off state, the current limiting module limits the impact current generated when the magnetron is switched on; under the condition that the temperature controller is in a conducting state, the current limiting module is in a short circuit state, and the power consumption of the device is reduced; the impact current suppression module is convenient to install, simple in manufacturing process and low in cost.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (11)
1. A rush current suppression device, characterized in that the device comprises: the device comprises an impulse current suppression module, a transformer and a magnetron; the impact current suppression module is positioned in a first loop where a first coil of the transformer is positioned; the magnetron is positioned in a second loop where a second coil of the transformer is positioned;
the surge current suppression module includes: a current limiting module, a temperature controller and a heating device; the current limiting module is connected with the temperature controller in parallel; the heating device is connected in series with the current limiting module and the temperature controller which are connected in parallel; the heating device generates heat under the action of current; the current limiting module is used for limiting the impulse current generated when the magnetron is conducted;
the temperature controller is used for detecting the ambient temperature and controlling the temperature controller to be in a disconnected state or a connected state based on the ambient temperature; wherein the ambient temperature is related to heat generated by the heat generating device.
2. The device of claim 1, wherein the thermostat is configured to control itself to be in an off state when the ambient temperature is less than a preset temperature threshold; and controlling the self to be in a conducting state under the condition that the ambient temperature is greater than or equal to the preset temperature threshold.
3. The apparatus of claim 1, wherein the power of the heat generating device is associated with a parameter of the thermostat.
4. The apparatus of claim 1, wherein the heat generating device is close to a temperature sensing portion of the thermostat.
5. The device of any one of claims 1 to 4, wherein the current limiting module comprises a current limiting resistor or a negative temperature coefficient thermistor.
6. The apparatus of claim 5, wherein the current limiting module is remote from the heat generating device in the case where the current limiting module is a negative temperature coefficient thermistor.
7. The apparatus of claim 2, wherein the heat generating device is further configured to generate heat under the action of the current continuously when the thermostat is in the on state, and the generated heat is used to maintain the ambient temperature required by the thermostat to maintain the on state.
8. The device of claim 5, wherein in case that the current limiting module is a negative temperature coefficient thermistor, in case that the thermostat is in a conduction state, the resistance value of the negative temperature coefficient thermistor increases with the decrease of the self temperature.
9. The device of claim 5, wherein the thermostat is a bimetallic thermostat.
10. The apparatus of claim 1, wherein the resistance of the heat generating device is less than a predetermined threshold.
11. A microwave oven arrangement, characterized in that it comprises an apparatus according to any of claims 1-10.
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| CN111092545A (en) | 2020-05-01 |
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