CN101248706A - Electric device and heating cooking device - Google Patents

Electric device and heating cooking device Download PDF

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Publication number
CN101248706A
CN101248706A CNA2006800311964A CN200680031196A CN101248706A CN 101248706 A CN101248706 A CN 101248706A CN A2006800311964 A CNA2006800311964 A CN A2006800311964A CN 200680031196 A CN200680031196 A CN 200680031196A CN 101248706 A CN101248706 A CN 101248706A
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China
Prior art keywords
electric leakage
power
unit
electric
control unit
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CNA2006800311964A
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CN101248706B (en
Inventor
青木泰亲
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Priority claimed from JP2005338210A external-priority patent/JP5050340B2/en
Priority claimed from JP2006101760A external-priority patent/JP4946140B2/en
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority claimed from PCT/JP2006/316768 external-priority patent/WO2007023961A1/en
Publication of CN101248706A publication Critical patent/CN101248706A/en
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Publication of CN101248706B publication Critical patent/CN101248706B/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Abstract

It is possible to prevent electric leak and electric shock and reduce power consumption during a wait mode. An electric device includes a device body (1) using AC power and a power supply unit (6) arranged on the device body (1) connected to the AC power supply as input power and outputting DC and AC as power supply to the device body (1). The power supply unit (6) includes a power supply circuit (7) for converting inputted AC power to DC power electrically insulated from the AC power supply, relays (8a, 8b) for turning on/off AC power supply to the device body (1), and an electric leak detection circuit (10) arranged between the relay contacts and the device body (1) for turning off the relays (8a, 8b) while detecting electric leak in the device body (1). Thus, while electric leak is present in the device body (1), the leak detection circuit (10) keeps the relays (8a, 8b) off to stop AC power supply to the device body (1), thereby preventing an accident due to electric leak. Moreover, during a wait mode, the relays (8a, 8b) are kept off to reduce power consumption.

Description

Electrical equipment and heating cooking apparatus
Technical field
The present invention relates to particularly, can prevent the safety means of the electric leakage or the electric shock of electrical equipment when the electrical equipment that can reduce power consumption at standby mode.In addition, the present invention relates to reduce the electrical equipment of electrical power consumed, particularly, can prevent to make water and/or produce the electric leakage of cooking equipment of steam or the safety means of electric shock at standby mode.
Background technology
Traditionally, in the electrical equipment of for example microwave oven, when in the main body of these microwave ovens, being equipped with earth terminal, make earth terminal ground connection during operation, to avoid may the be got an electric shock risk of fault of user.In addition, the microwave oven that exists some to be equipped with the electrical leakage breaking function supposes that the earth terminal that the microwave oven main body is equipped with is not the situation of firm ground connection.
Figure 11 shows the circuit diagram of above-mentioned microwave oven.As shown in figure 11, this microwave oven is arranged by magnetron 104, control board 106, relay 107 and zero phase current transformer 108 and is formed.Magnetron 104 usefulness comprise the power supply vibration of high tension transformer 101, capacitor 102 and diode 103.The electric power that operation control panel 106 receives by lower pressure transducer 105 supplies.Relay 107 disconnects and closes at connection between power supply and the high tension transformer 101.Zero phase current transformer 108 is provided on the power circuit between power supply and the relay 107.Because relay 107 work are to receive from the control signal of control board 106 supplies, so that give high tension transformer 101 with supply of electric power, magnetron 104 vibrations are so that heat food.In addition, control board 106 monitors the unsymmetrical current that zero phase current transformer 108 detects, so that detect electric leakage.When detecting electric leakage, control board 106 is block system relay 107 immediately, so that cut off leakage current (with reference to patent disclosure 1).
Patent disclosure 1:JP-A-58-175282
Summary of the invention
The problem to be solved in the present invention
But in the traditional arrangement of microwave oven, because lower pressure transducer 105 has been installed on control board 106, for the electric leakage that is caused by ageing of insulation that occurs in the control board 106, existence can not effectively realize the problem of electrical leakage breaking function.In addition, in recent years, sell when being equipped with the microwave oven of baking box function, on control board, further arranged the relay of connection/cut-outs (turn on/turn off) heater etc. main, therefore, make control board itself become complicated with become large scale.Consequently, compare, need higher cost, so that improve the insulation property of control board itself with the cost of conventional microwave oven.
And, recently, generally the non-firm power of microwave oven need be suppressed to 1W (watt) or below the 1W.In addition, in not being equipped with the microwave oven of time clock feature, require its non-firm power is reduced to 50mW (milliwatt) or is lower than 50mW, that is, various ideas are all managed to solve and are made non-firm power roughly near the needs of zero energy.In above-mentioned traditional arrangement, continuously supply of electric power is given the circuit of the detection electric leakage that is provided on the control board.Even can not ignore the electric power that in testing circuit self, consumes therefore.In addition, owing to also want the circuit of operation detection electric leakage, almost non-firm power can not be suppressed to another problem of being less than or equal to 50mV so exist.In addition, also exist in metal, when between the metal part of control board and shell is divided, occurring leaking electricity, unless pull out supply socket otherwise the another problem that can not avoid leaking electricity as in the electrical equipment of its shell.
The present invention makes in order to solve above-mentioned traditional problem, the purpose of this invention is to provide the electrical equipment of being furnished with the safety means that can prevent to leak electricity or get an electric shock.In addition, another object of the present invention provides the heating cooking apparatus that is equipped with safety means, and described safety means can prevent electric leakage or get an electric shock, and heating cooking apparatus can also reduce power consumption when standby mode.
The means of dealing with problems
In order to solve above-mentioned traditional problem, electrical equipment according to the present invention comprises: utensil (appliance) main body of using AC (alternating current) power supply; And power subsystem, be provided in AC power supplies in the appliance body and link to each other with this power subsystem as the input power supply, this power subsystem output dc voltage and AC voltage to appliance body as supply voltage; Wherein, power subsystem comprises: will import the power circuit that the AC power supplies voltage transitions becomes the DC supply voltage of isolating with the AC power supplies electricity; With the relay that begins or stop the AC power supplies voltage supply of appliance body.
Consequently, owing to the AC voltage supply that can stop,, AC power supplies can being cut off from appliance body so block system relay is feasible except that power subsystem to appliance body.
In addition, the power subsystem of electrical equipment of the present invention is furnished with the terminal that is provided in relay and the leakage inductance slowdown monitoring circuit between the appliance body, is used for detecting the electric leakage of present appliance body, so that block system relay.
Thereby when electric leakage took place in appliance body, leakage inductance slowdown monitoring circuit block system relay was so that stop AC voltage supply to appliance body.Consequently, can avoid the fault that causes by electric leakage in advance.
In addition, electrical equipment of the present invention block system relay when electrical equipment is in the standby mode.
Consequently, can eliminate the electric power of engage relay, so that can eliminate the unnecessary power consumption of electrical equipment.
In addition, do not make the user under the standby mode of electrical appliance, AC voltage is not applied on the unnecessary part of appliance body, thereby make operation safer.
In addition, electrical equipment of the present invention is equipped with the control unit of control apparatus; Control unit work is operated with the dc voltage that the reception power subsystem applies, and control is to the supply of the dc voltage of relay and leakage inductance slowdown monitoring circuit.
Thereby, when the higher relay of the possibility of electric leakage takes place, can apply the dc voltage of leakage inductance slowdown monitoring circuit, so that reduce unnecessary power consumption in turning on appliance body.
In addition, when electrical equipment is in standby mode following time, the control unit of electrical equipment of the present invention stops the dc voltage supply to relay and leakage inductance slowdown monitoring circuit.
Thereby, under the standby mode that does not need AC voltage, can stop, so that reduce unnecessary power consumption to the dc voltage of relay and leakage inductance slowdown monitoring circuit.
In addition, the power subsystem of electrical equipment of the present invention is furnished with noise filter circuit and power subsystem is provided as individual unit at the input side of AC power supplies.
Thereby, owing to can be integrated in the power subsystem, can improve considerably and in power subsystem, take place aspect electric leakage risky, thereby can improve the fail safe of whole electrical equipment not detecting the part that electric leakage takes place.
And heating cooking apparatus according to the present invention comprises: load; The control device of control load; The power subsystem of control device; To give the electric power supply unit of control device from the supply of electric power of power subsystem; Give electric power supply unit with signal provision, so that the initialize signal generation unit of beginning supply of electric power; Source power supply voltage is supplied to the electric wire of load and power subsystem; The current detecting unit of the unsymmetrical current of electric wire is flow through in detection; With the signal of basis, judge whether to exist the electric leakage judging unit of electric leakage from current detecting unit output; Wherein, when electric power supply unit was not supplied electric power under standby mode, the signal of response initialize signal generation unit began the supply of supply voltage, so that control device and electric leakage judging unit begin their operation; In addition,, so, proceed the supply of electric power of electric power supply unit if the signal of electric leakage judging unit is normal, so that proceed the operation subsequently of control device and electric leakage judging unit, in addition, electric power supply unit stop supplies electric power.
Thereby, owing under standby mode, stopped, can eliminating the power consumption in control device and the electric leakage judging unit to the supply of electric power of control device with the electric leakage judging unit.
In addition, the control device of heating cooking apparatus of the present invention comprises the mains switch with function of reset, is used for the connection between cut-off/close load and the power subsystem; And, under the abnormal situation of signal of electric leakage judging unit, the control device disconnecting power switch.
Thereby, even in power subsystem or control device, leak electricity once in a while, also can cut off switchgear, so that stop power supply.Consequently, can avoid getting an electric shock.
In addition, electrical equipment according to the present invention comprises: load; The control device of control load; Supply voltage is supplied to the electric wire of load and control device; The current detecting unit of the unsymmetrical current of electric wire is flow through in detection; According to signal, judge whether to exist the electric leakage judging unit of electric leakage from current detecting unit output; The master switch facility of cut-off/close electric wire; With the switch in parallel with master switch facility; Wherein, under the standby mode that master switch facility disconnects, Closing Switch, thereby the supply of beginning supply voltage are so that control device begins its control operation; When electric leakage judged that the device judgement electric leakage does not take place, because the closed master switch facility of control device, even the switch disconnection, operation subsequently and the control device that also can proceed control device disconnected master switch facility to be converted to standby mode.
Thereby, owing to the supply of electric power that under standby mode, stops control device, can eliminate the power consumption in the control device.In addition, even in load or control device, leak electricity once in a while,, also can avoid getting an electric shock owing to cut off master switch facility.
In addition, electrical equipment of the present invention is furnished with the notice device; And, judge that in electric leakage the device judgement takes place under the situation of electric leakage, control device is notified, and disconnects master switch facility.
Thereby electrical equipment can be notified the user with the fact that electric leakage takes place.
In addition, electrical equipment of the present invention is furnished with memory device and notice device; And when electric leakage judges that electric leakage takes place in the device judgement, control device will leak electricity information stores in memory device, and in addition, judgement is not leaked electricity even device is judged in electric leakage, can notify the electric leakage information that is stored in the memory device yet.
Thereby owing to the mode of operation that electric leakage takes place can be stored in the memory device, this mode of operation can be given a clue for repairing the electric leakage spot.
In addition, electrical equipment of the present invention is equipped with microcomputer; And microcomputer is equipped with the load that operation is connected with electric wire under predetermined state to carry out audit program so that judge whether normal audit program and microcomputer that device is made are judged in the check electric leakage by scheduled operation.
Thereby, this electrical equipment can by simple operations confirm with all loads of electric wire coupling in whether have electric leakage.
Advantage of the present invention
Electrical equipment of the present invention is equipped with and can prevents the safety means that leak electricity or get an electric shock, and when electrical equipment is in standby mode, can reduce power consumption.
The accompanying drawing summary
Fig. 1 is the external view according to the microwave oven of first embodiment of the invention;
Fig. 2 is the circuit diagram according to the microwave oven of first embodiment of the invention;
Fig. 3 is the external view according to the heating cooking apparatus of second embodiment of the invention;
Fig. 4 is the circuit diagram according to the heating cooking apparatus of second embodiment of the invention;
Fig. 5 (a) represents under the present invention second embodiment, when opening or closing in the standby mode Xiamen, and the sequential chart of the voltage of the various piece of initialize signal generation unit; And Fig. 5 (b) be expression when the connection of door switch/cut-out logic state is reversed, the sequential chart of the voltage of the various piece of initialize signal generation unit;
Fig. 6 is the circuit diagram according to the heating cooking apparatus of third embodiment of the invention;
Fig. 7 is the external view according to the microwave oven of fourth embodiment of the invention;
Fig. 8 is the circuit diagram according to the microwave oven of fourth embodiment of the invention;
Fig. 9 is the circuit diagram according to the microwave oven of fifth embodiment of the invention;
Figure 10 is the circuit diagram that is provided in the microwave oven on the electric wire of control device according to sixth embodiment of the invention, master switch facility; With
Figure 11 is the circuit diagram of conventional microwave oven.
Label and denotational description
1 appliance body
2 power lines
3 earth terminals
4 earth connections
The 5AC power supply
6 power subsystems
8a, 8b relay
9 noise filter circuits
10 leakage inductance slowdown monitoring circuits
11 control units
12 switches
13 resistors
14 transistors
15 converters
16 Zero-phase current converters
17 decision circuitry
The 1008a electric wire
1010a radio-frequency generator (load)
1010b heater (load)
1011a, 1011b, 1011c, 1011d relay (switchgear)
1013 microcomputers (control device)
1014 AC/DC transducers (power subsystem)
1015 zero phase current transformers (current detecting unit)
1016 electric leakage judging units
1017 supply voltage applying units
1019 initialize signal generation units
1020 door switch
1025 mains switches
2004 display units (notice device)
The 2009a electric wire
2010,2025 relays (main switch)
2012 radio-frequency generators (load)
2013 control devices
2015 microcomputers
2016 memory devices
2018 zero phase current transformers (current detector)
Device is judged in 2019 electric leakages
2010 switches
2022 heaters (load)
Embodiment
First invention is a kind of like this electrical equipment, comprises: the appliance body of using AC power supplies; And power subsystem, the AC power supplies that is provided in the utensil is connected to this power subsystem as the input power supply, and this power subsystem output dc voltage and AC voltage arrive described appliance body as supply voltage; Wherein, described power subsystem comprises: the power circuit that is used for input AC power supplies voltage transitions is become the DC supply voltage of isolating with described AC power supplies electricity; With the relay that is used to begin and stop to the AC power supplies voltage supply of appliance body.Consequently, owing to the AC voltage supply that stops appliance body,, thereby make operation safer so block system relay makes that AC power supplies can be cut off from appliance body except that power subsystem.
More particularly, in second invention, the power subsystem of first invention provides the contact that is provided in described relay and the leakage inductance slowdown monitoring circuit between the described appliance body, is used for detecting the electric leakage that occurs at described appliance body, so that cut off described relay.Thereby when electric leakage took place in appliance body, leakage inductance slowdown monitoring circuit block system relay was so that stop AC voltage supply to appliance body.Consequently, can avoid the fault that causes by electric leakage in advance.
More particularly, in the 3rd invention, the electrical equipment of second invention is in standby mode block system relay of following time at electrical equipment.Consequently, can eliminate the electric power of engage relay, so that can eliminate the unnecessary power consumption of electrical equipment.In addition, do not make the user under the standby mode of electrical appliance, AC voltage is not applied on the unnecessary part of appliance body, thereby make operation safer.
Especially, in the 4th invention, the appliance body of second invention is equipped with the control unit and the described control unit that are used for control apparatus to operate, the dc voltage that reception applies from power subsystem, and control is to the connection/cut-out of the dc voltage supply of relay and leakage inductance slowdown monitoring circuit.Thereby, when the higher relay of the possibility of electric leakage takes place in turning on appliance body, can begin the dc voltage of leakage inductance slowdown monitoring circuit, thereby can reduce unnecessary power consumption.
More particularly, in the 5th invention, when electrical equipment is in standby mode following time, the control unit of the 4th invention cuts off the dc voltage supply to relay and leakage inductance slowdown monitoring circuit.Thereby, under the standby mode that does not need AC voltage, can stop, so that can reduce unnecessary power consumption to the dc voltage of relay and leakage inductance slowdown monitoring circuit.
More particularly, in the 6th invention, the power subsystem of second invention is equipped with noise filter circuit and power subsystem to provide as individual unit at the input side of AC power supplies.Thereby, be integrated in the power subsystem owing to can not detect the part of electric leakage generation, can improve considerably aspect risky that generation is leaked electricity in power subsystem, thus the fail safe that can improve whole electrical equipment.
The 7th invention is a kind of heating cooking apparatus, and it comprises: load; Control the control device of described load; The power subsystem of described control device; To give the electric power supply unit of described control device from the supply of electric power of described power subsystem; Signal is applied to described electric power supply unit so that the initialize signal generation unit of beginning supply of electric power; Source power supply voltage is applied to the electric wire of described load and described power subsystem; The current detecting unit of the unsymmetrical current of described electric wire is flow through in detection; With the signal of basis, judge whether to exist the electric leakage judging unit of electric leakage from described current detecting unit output; Wherein, do not supply the standby mode of electric power, begin the supply of supply voltage in response to the signal of described initialize signal generation unit, thereby described control device and described electric leakage judging unit begin their operation in described electric power supply unit; And, wherein, if the signal of described electric leakage judging unit is normal, so, continue to carry out the supply of electric power of described electric power supply unit, thereby continue to carry out the subsequent operation of described control device and described electric leakage judging unit, in addition, when electric leakage not taking place, stop the supply of electric power of electric power supply unit, but, not operation forward in the given time.Consequently, can eliminate the power consumption in control device and the electric leakage judging unit, thus the power consumption under the reduction place standby mode.
More particularly, in the 8th invention, when the crew-served door switch of opening that in the initialize signal generation unit of the 7th invention, has been equipped with door, by disconnecting or the door close switch generates signal.Consequently, when when not using the material that heating cooking will be cooked when adding electric switch, power supply carries out the opening of essential door, thereby can not damage user-friendly function.
More particularly, in the 9th invention, the heating cooking apparatus of the 7th invention is equipped with the switchgear of the connection between cut-off/close load and the electric wire; And, under the abnormal situation of signal of electric leakage judging unit, control device cut-off switch equipment.Thereby, even in load, leak electricity once in a while,, can avoid getting an electric shock owing to can cut off switchgear.
More particularly, in the tenth invention, the control device of the heating cooking apparatus of the 7th invention is equipped with the mains switch with function of reset, is used for the connection between cut-off/close load and the power subsystem; And, under the abnormal situation of signal of electric leakage judging unit, the control device disconnecting power switch.Thereby, even in power subsystem or control device, leak electricity once in a while, also can cut off switchgear, so that cut off power supply.Consequently, can avoid getting an electric shock.
More particularly, in the 11 invention, the heating cooking apparatus of the 7th invention comprises: have the mains switch of function of reset, be used for the connection between cut-off/close load and the power subsystem; And the switchgear of the connection between cut-off/close load and the electric wire; Wherein, under the abnormal situation of signal of electric leakage judging unit, control device cut-off switch equipment and after this, when the signal of electric leakage judging unit further when undesired, the control device disconnecting power switch.Thereby, can predict that electric leakage appears in the loading section, still appears in power subsystem and the control device.
More particularly, in the 12 invention, the 9th any one heating cooking apparatus of inventing the 11 invention is equipped with the notice device; And, when the signal of electric leakage judging unit is undesired, by the generation of notice device notice electric leakage.For example, owing to show error indicator, can notify electric leakage has taken place.
More particularly, in the 13 invention, in the method body of notice electric leakage, the control device of the 12 invention does not stop the supply of electric power of electric power supply unit.Consequently, control device continues notice and is not converted to standby mode.
The 14 invention is a kind of electrical equipment, and it comprises: load; The control device of control load; Supply voltage is supplied to the electric wire of load and control device; The current detecting unit of the unsymmetrical current of electric wire is flow through in detection; According to signal, judge whether to exist the electric leakage judging unit of electric leakage from current detecting unit output; The master switch facility of cut-off/close electric wire; With the switch that is connected in parallel with master switch facility; Wherein, under the standby mode that master switch facility disconnects, Closing Switch, so that the supply of beginning supply voltage, thereby control device begins its control operation; When electric leakage judges that device is judged not generation electric leakage,, also proceed the operation subsequently of control device and, stop power supply control device and load owing to control device disconnects master switch facility because the closed master switch facility of control device is opened even open to cut off.Consequently, can alleviate the risky aspect that electric leakage takes place or get an electric shock, and, the power consumption under the standby mode can be reduced.
More particularly, in the 15 invention, judge that in electric leakage the device judgement takes place under the situation of electric leakage, the control device of the 14 invention disconnects master switch facility, so that stop the power supply to control device and load.Consequently, can alleviate the risky aspect that electric leakage takes place or get an electric shock, and, the power consumption under the standby mode can be reduced.
More particularly, in the 16 invention, under the situation that state-transition does not take place in the given time, the control device of the 14 invention disconnects master switch facility.Consequently, stop supply of electric power automatically, so that can realize automatic circuit break function to control device.
More particularly, in the 17 invention, even when also not passing through the scheduled time, judge that in electric leakage the device judgement takes place under the situation of electric leakage, the control device of the 16 invention disconnects master switch facility.Consequently, stop power supply, so that can alleviate the risky aspect that electric leakage takes place or get an electric shock to control device and load.
More particularly, in the 18 invents,, judge that at electric leakage judgement device control device can be notified, and can disconnect master switch facility under the situation that electric leakage takes place because the control device of the 14 invention or the 17 invention is equipped with the notice device.
More particularly, in the 19 invention, because the control device of the 14 invention is equipped with memory device, when the signal of electric leakage judgement device was undesired, the information stores of will leaking electricity was in memory device, so that can derive this information in the slave controller spare.
More particularly, in the 20 invention, because the control device of the 14 invention is equipped with memory device and display device, judge that in electric leakage the device judgement takes place under the situation of electric leakage, control device will leak electricity information stores in memory device, in addition, the signal of judging device when electric leakage just often, the control device notice is stored in the above-mentioned information in the memory device.Consequently, the generation of the electric leakage of user's generation of can grasping over.
More particularly, in the 21 invention, the control device of the 14 invention is equipped with microcomputer; Microcomputer is equipped with the load that operation is connected with electric wire under predetermined state, carries out audit program so that judge whether normal audit program and microcomputer that device is made are judged in the check electric leakage by scheduled operation.Consequently, can carry out earth detection.
More particularly, in the 22 invention, the control device of the 21 invention is equipped with the notice device, so that can notify the result who carries out audit program.
Referring now to accompanying drawing, embodiments of the invention are described.Should be understood that and the invention is not restricted to the following examples.
(embodiment 1)
Fig. 1 is the external view according to the microwave oven of first embodiment of the invention.
As shown in Figure 1, power line 2 is provided in the appliance body 1, and receives AC power supplies voltage from source power supply.When on main body 1, being equipped with earth terminal 3, ground wire 4 is connected with earth terminal 3, so that with appliance body 1 ground connection.Because the shell of microwave oven is covered by metal, the earthing of casing can be avoided the risk of fault of getting an electric shock, thereby guarantee safety.
Fig. 2 is the circuit diagram according to the microwave oven of first embodiment of the invention.
As shown in Figure 2, label 1 metal representing appliance body and shell the is shown state by ground wire 4 ground connection partly.And AC power supplies 5 is connected to appliance body 1 from source power supply.Label 6 indications are wherein with the power subsystem of AC power supplies 5 as the input power supply.In power subsystem 6, power circuit 7, relay 8a and 8b, noise filter circuit 9 and leakage inductance slowdown monitoring circuit 10 are provided in the same unit.Power circuit 7 will become the dc voltage of isolating with AC power supplies 5 electricity from the AC voltage transitions of AC power supplies 5.Relay 8a and 8b connection/cut-out are as the supply of the AC voltage of the supply voltage of the internal element of appliance body 1.Using noise filtering circuit 9 is so that the noise that suppresses to generate from the internal element of utensil is penetrated into the outside of utensil, and noise filter circuit 9 then is installed if desired.As power circuit 7, on the whole, use Switching Power Supply in the present embodiment with fabulous power conversion efficiency.Alternately, can in power circuit 7, use lower pressure transducer.Label 11 shows control unit.Although not shown in Fig. 2, under the situation of microwave oven, control unit 11 control examples are as the operation of each unit of the appliance body 1 of the radio-frequency generator that is used for the electromagnetism heating operation and cooling fan motor.
Operation and the effect relevant with the microwave oven that provides are in the above described manner described now.
At first, when being connected the AC voltage that applies AC power supplies 5 with source power supply, under first kind of situation, the AC voltage of this AC power supplies 5 is entered in the power subsystem 6 by power line 2 with microwave oven.The AC voltage of AC power supplies 5 is applied on the side contact of relay 8a and 8b by noise filter circuit 9, and is applied on the power circuit 7.When the AC of AC power supplies 5 voltage is input in the power circuit 7, the generation dc voltage (+12V), as the supply voltage of control unit 11.The mode of operation of control unit 11 response utensils is connected the switch 12 that is provided in the control unit 11, drives the relay 8a that is provided in the power subsystem 7 and the supply voltage of 8b so that apply.The switch 12 that should be understood that application in this case can be arranged by using semiconductor, or alternately, can arrange by using other device.When apply the dc voltage that drives relay 8a and 8b (+12V) time, the current flows through resistor 13 that flows through the coil of relay 8a and 8b arrives the base stage of transistors 14, therefore, transistor 14 conductings, thereby the contact of continuing engage relay 8a and 8b.As previously mentioned, because the function of control unit 11 in needs, is given control unit 11 with the AC supply of electric power, so that control is provided in the supply of AC electric power of the supply voltage of each unit in the appliance body 1 as driving.
Arrange by using these, stop being provided in the AC supply of electric power of each unit in the appliance body 1, thus since relay 8a and 8b cut off, except that power subsystem 6, AC power supplies 5 with can be from appliance body 1 cut-out.In addition, (+the converter 15 that 12V) also is configured power circuit 7 is isolated, and control unit 11 is isolated with AC power supplies 5 electricity similarly, thereby causes safer structure owing to be applied to dc voltage on the control unit 11.In addition,, the circuit part that has higher electric leakage risk like this can be concentrated, thereby the solution of leaking electricity can be easily taked to prevent in configuration aspects because the circuit part that applies the AC power supplies voltage of AC power supplies 5 continuously concentrates in the power subsystem 6.
The operation of leakage inductance slowdown monitoring circuit 10 then, is described.Label 16 is zero phase current transformers.Zero phase current transformer 16 detects input AC electric current and output AC difference between currents, and responds this difference generation voltage.Label 17 shows decision circuitry.Surpass under the situation of predetermined threshold at the output voltage from zero phase current transformer 16, electric leakage has taken place in decision circuitry 17 judgements, and the output judged result.Under the situation of present embodiment, when electric leakage had taken place in decision circuitry 17 judgements, decision circuitry 17 had the signal of " 0V " level to the base stage output of transistor 14, so that cut off transistor 14, thus decision circuitry 17 block system relay 8a and 8b.
Thereby, when electric leakage takes place in appliance body 1 when, leakage inductance slowdown monitoring circuit 10 block system relay 8a and 8b, so that stop AC supply of electric power to the internal element of appliance body 1, thus the fault that can avoid in advance leaking electricity and cause.
In addition, in the present embodiment, when relay 8a and 8b cut-out, stop AC supply of electric power to each unit of appliance body 1.Consequently, do not using under the standby mode of microwave oven, because relay 8a and 8b cut off, when can preventing the fault that causes by electric leakage, the electric power that consumes among relay 8a and the 8b can be reduced, therefore, the safer circuit arrangement of lower power consumption can be realized having.
In addition, in relay 8a and 8b cut-out,, can stop supply, thereby can suppress unnecessary power consumption and can further reduce function the supply voltage of leakage inductance slowdown monitoring circuit 10 owing to need not the sensing electric leakage.In the present embodiment, appliance body 1 is arranged in the following manner, promptly by the switch 12 of operation control circuit 11, begins/stop the dc voltage (+12V) supply to relay 8a and 8b and leakage inductance slowdown monitoring circuit 10 simultaneously, that is, illustrated and made the drive circuit simple situation that becomes like this.Alternately, can control dc voltage (+12V) supply dividually.
(embodiment 2)
Fig. 3 is the external view according to the heating cooking apparatus of second embodiment of the invention.As shown in Figure 3, door 1002 is provided in the front of main body 1001 in mode that can free opening/closing.Label 1003 indication guidance panels.Display element 1004 and keyboard 1005 on guidance panel 1003, have been equipped with.Ground wire 1007 is connected with earth terminal 1006 on being provided in main body 1001, so that with main body 1001 ground connection.Label 1008 indication power lines.
Fig. 4 representative is according to the circuit diagram of the heating cooking apparatus of second embodiment of the invention.As shown in Figure 4, label 1010a shows radio-frequency generator and heater (corresponding with thermal source), load promptly of the present invention respectively with 1010b.Radio-frequency generator 1010a is by layouts such as magnetrons, and it produces microwave, so that heating and the corresponding food of material that will heat.The supply voltage of these loads applies via relay 1011a, 1011b, 1011c and 1011d from power line 1008, electric wire 1008a by source power supply, and relay 1011a, 1011b, 1011c and 1011d work to be subjected to the switch of control device control of the present invention.In addition, for all these loads, by relay 1011a and 1011b with respect to their two terminals of dump.Thereby relay 1011a, 1011b, 1011c and 1011d are designed to can to flow through by turn-on transistor 1012a, 1012b, 1012c and 1012d electric current the mode of the coil of these relays 1011a, 1011b, 1011c and 1011d and activate.These transistors 1012a, 1012b, 1012c and 1012d response constitute the control signal of microcomputer 1013 supplies of control device and operate.
Label 1014 shows the AC/DC transducer that constitutes power subsystem, its be used to produce the required dc voltage of operation control device (+5V).AC/DC transducer 1014 directly is connected with the electric wire 1008a of the source power supply of supplying from power line 1008.Such power supply does not have when connecting load can be suppressed to power consumption the function of being less than or equal to 10mV.Above-mentioned AC/DC transducer can be reduced in unnecessary power consumption during the standby mode, so that in the time can effectively utilizing the power save properties of under standby mode AC/DC transducer 1014 itself, can reduce the non-firm power of heating cooking apparatus.Be provided on the electric wire 1008a that is connected to power line 1008 with the corresponding zero phase current transformer 1015 of the current detecting unit of the embodiment of the invention 2, so that zero phase current transformer 1015 detects the unsymmetrical current that produces in electric wire 1008a.Unsymmetrical current is caused by following reason, that is exactly, because ageing of insulation, or the earth fault relevant with control device with electric wire and the load that is connected with electric wire, the shell from the electric current of the electric wire supply of zero phase current transformer 1015 back from main body 1001 leaks out with the ground that is connected with shell.
Label 1016 shows the electric leakage judging unit that output with zero phase current transformer 1015 converts the signal level that can be judged by microcomputer 1013 to.For example, when unsymmetrical current surpassed 10mA (milliampere), 1016 outputs of electric leakage judging unit had the output voltage with the supply voltage of microcomputer 1013 corresponding " Vdd " level.When unsymmetrical current was less than or equal to 10mA, 1016 outputs of electric leakage judging unit equaled the output voltage of 0V, that is, and and the reference potential of microcomputer 1013.According to the output signal of this electric leakage judging unit 1016, microcomputer 1013 judges whether to leak electricity.In addition, by for example considering after detecting electric leakage till open the contact of relay 1011a and 1011b, the condition of operating time is arranged to the value of this unsymmetrical current not the value that can have a negative impact to human body.
Label 1017 indications power feeding unit of the present invention.Because conducting/disconnection constitutes the transistor 1018 of power feeding unit 1017, can control supply of electric power to control device and other device.In the second embodiment of the present invention, the microcomputer 1013, electric leakage judging unit 1016, display element 1004 and the keyboard 1005 that constitute control device are operated the supply of electric power of reception from power feeding unit 1017.
Label 1019 indication initialize signal generation units.Door switch 1020 is equipped with initialize signal generation unit 1019, and connects collaboratively/cut off with door 1002 the disconnection/shutoff operation of the front that is provided in main body 1001.Connection/rupturing operation that initialize signal generation unit 1019 is designed to respond door switch 1020 generates initialize signal.The initialize signal of response initialize signal generation unit 1019 outputs, or from the power supply inhibit signal of microcomputer 1013 outputs, energized electric power supply unit 1017, or keep its on-state.Under the state that the transistor 1018 of this power feeding unit 1017 cuts off, stop the microcomputer 1013 of the whole system of the supply of electric power of control device etc. and control heating cooking apparatus is under the halted state (suspension state).In addition, because transistor 1012a, 1012b, 1012c and the 1012d with the coupling of the coil of relay 1011a, 1011b, 1011c and 1011d disconnects respectively, can not consume electric power with relay 1011a, 1011b, 1011c and the 1011d of the output coupling of AC/DC transducer 1014.In addition, because when door 1002 is closed, door switch 1020 disconnects, so initialize signal generation unit 1019 can not consume electric power.As mentioned above, the output current of AC/DC transducer 1014 power consumption that becomes minimum and heating cooking apparatus also becomes minimum.
Now operation and the effect relevant with the heating cooking apparatus that provides in the above described manner are described below.
At first, will the operation of initialize signal generation unit 1019 be described.Fig. 5 is the sequential chart of the voltage of representative disconnection and each unit of closing 1002 o'clock initialize signal generation units 1019 of door.Fig. 5 (a) shows when door 1002 and closes and door switch 1020 sequential chart when disconnecting; And Fig. 5 (b) shows when door 1002 and closes and door switch 1020 sequential chart when connecting.Fig. 5 (a) shows from closing in standby mode Xiamen 1002 and door 1002 is opened, operation microcomputer 1013, the duration of continuing the state of mode of operation then.Following the providing of relation between door 1002 and the door switch 1020: when door 1002 was closed, door switch 1020 disconnected, and when door 1002 was opened, door switch 1020 was connected.When the user when standby mode disconnects door 1022, door switch 1020 is connected, so as on V1 and V2 the voltage of generation+5V.When formation voltage on V2, charging current flows through capacitor 1021, then, generates the voltage of the V3 shown in Fig. 5 (a) on V3, becomes 0 up to charging current.Become the 0V level by voltage turn-on transistor 1022 and the V4 that generates on V3, therefore, the base current of transistor 1018 flows through, so that turn-on transistor 1018.Because initialize signal generation unit 1019, energized electric power supply unit 1017 is so that microcomputer 1031 begins operation.Then, microcomputer 1013 out-put supply inhibit signals (V5) so that the transistor 1023 of turn-on power electric power supply unit 1017 continues the voltage to Vdd supply+5V, therefore continue operation.
Those of the connection of the door switch 1020 shown in Fig. 5 (b)/cut-out logical operation and Fig. 5 (a) are opposite.That is to say, following give go out 1002 and door switch 1020 between relation: when door 1002 was closed, door switch 1020 was connected, and when door 1002 is opened, door switch 1020 disconnections.When the user when standby mode disconnects door 1022, door switch 1020 disconnects, so that the voltage of general+5V becomes 0V.Voltage on the V2 is corresponding by the states of 1021 discharges in the resistance with the electric charge in being stored in capacitor 1021, becomes 0V from+5V gradually, remains on then on the 0V, closes once more up to door 1002.
Then, when door 1002 is closed, thereby when door switch 1020 was connected, the voltage of V2 became+5V.If formation voltage on V2, so, charging current flows through capacitor 1021, and generates the voltage of Fig. 5 (b), becomes 0 up to charging current.The voltage that response generates on V3, turn-on transistor 1022, the voltage of V4 becomes the 0V level, and therefore, the base current of transistor 1018 flows through, thus turn-on transistor 1018.Because the operation of initialize signal generation unit 1019, energized electric power supply unit 1017 is so that microcomputer 1031 begins operation.Then, microcomputer 1013 out-put supply inhibit signals (V5) so that the transistor 1023 of turn-on power electric power supply unit 1017 continues the voltage to Vdd supply+5V, therefore continue operation.
Then, if power feeding unit 1017 begins+5V is applied on the Vdd, so, operation electric leakage judging unit 1016.Zero phase current transformer 1015 can detect the unsymmetrical current that generates in electric wire 1008a, and produces the output voltage that is directly proportional with this unsymmetrical current.When electric leakage judging unit 1016 monitors the output voltage of zero phase current transformer 1015 generations, if becoming, the output voltage that monitors is greater than or equal to sensing voltage, so, electric leakage has taken place in 1016 judgements of electric leakage judging unit, and output is about the judged result of microcomputer 1013.Do not taking place under the normal condition of electric leakage, microcomputer 1013 connects in turn and block system relay 1011a, 1011b, 1011c and 1011d according to prior programming, so that control radio-frequency generator and thermal source, thereby the material that heating will be cooked.Then, after having finished culinary art, at the fixed time under the internal state situation about not changing (for example, under the situation of not handling keyboard 1005), because microcomputer 1013 makes the level of power supply inhibit signal drop to the 0V level, so that stop power feeding unit 1017, microcomputer 1013 stops control device and both supplies of electric power of electric leakage judging unit 1016, and is converted to standby mode.
Then, be described in the operation that detects under the situation about taking place of leaking electricity.When connect and block system relay 1011a, 1011b, 1011c and 1011d so that voltage is applied to radio-frequency generator and during with the corresponding load of thermal source, microcomputer 1013 is block system relay immediately, so that stop the voltage supply.And microcomputer 1013 makes the notify user of display element 1004 with this electric leakage, ends to use cooking equipment with prompting.In addition, when display element 1004 was notifying electric leakage to take place, microcomputer 1013 was not converted to standby mode, but continues to give notice.
(embodiment 3)
Fig. 6 is the circuit diagram according to the microwave oven of third embodiment of the invention.Should be understood that the same numeral that will be presented among the embodiment 2 is used as those labels of the structural elements of indication embodiment 3, and omit description of them.As with the difference of the 2nd embodiment, the mains switch 1025 with function of reset is provided in and load and power subsystem wire connecting front.Mains switch 1025 is arranged by the mode that magnetron is kept closed with when with manual type mains switch 1025 being switched to closure state.Although also can mains switch 1025 be switched to off-state with manual type, if to coil 1025a power supply, this mains switch 1025 can turn back to off-state, then, produces repulsive force along the direction that disconnects its contact.
Operation and the effect relevant with the microwave oven that provides are in the above described manner described now.
At first,, give AC/DC transducer 1014, so that the voltage of output+5V therefrom with supply of electric power because mains switch 1025 enters closure state.Under such state, heating cooking apparatus still is under the standby mode and AC/DC transducer 1014 is that power consumption under the state of minimum electric current becomes and equals the electric power that heating cooking apparatus consumes at the output current of AC/DC transducer 1014.Non-firm power is less than or equal to the AC/DC transducer of 10mW when in recent years, existing some wherein not have output current; With because the output of AC/DC transducer is lowered to lowly as far as possible, the power consumption of cooking equipment in the standby mode can be reduced to and be less than or equal to 50mW.
Then, because door 1002 is disconnected and closes, the voltage of+5V is applied on the microcomputer 1013, so that microcomputer 1013 proceeds to operator scheme.Under this normal condition that does not take place to leak electricity, microcomputer 1013 connects in turn and disconnects relay 1011a, 1011b, 1011c and 1011d according to prior programming, so that control radio-frequency generator 1010a and heater 1010b, thereby the material that heating will be cooked.Then, after having finished culinary art, under internal state does not change at the fixed time the situation, because microcomputer 1013 makes the level of power supply inhibit signal drop to the 0V level so that stop power feeding unit 1017, microcomputer 1013 stops control device and both supplies of electric power of electric leakage judging unit 1016, and is converted to standby mode.
Then, be described in the operation that detects under the situation about taking place of leaking electricity.Connecting respectively and block system relay 1011a, 1011b, 1011c and 1011d, so that with voltage be applied to radio-frequency generator 1010a and with the corresponding load of thermal source 1010b on situation under, microcomputer 1013 is block system relay immediately, so that stop the voltage supply.Because relay is cut off, if the output of electric leakage judging unit 1016 turns back to normal condition, so, microcomputer 1013 makes the notify user of display element 1004 with this electric leakage, so that prompting ends to use cooking equipment.In addition, when display element 1004 was notifying electric leakage to take place, microcomputer 1013 did not enter standby mode, but continues to give notice.Under the situation about all cutting off at the two ends of load, when electric leakage judging unit 1016 further judged that electric leakage takes place, microcomputer 1013 was exported the signal of turn-on transistor 1026 immediately, and to coil 1025a power supply, so that the contact of disconnecting power switch 1025.
(embodiment 4)
Fig. 7 shows the external view of the microwave oven of the 4th embodiment according to the present invention.As shown in Figure 7, door 2002 is provided in the front of main body 2001 in mode that can free opening/closing.Label 2003 indication guidance panels.Display unit 2004, keyboard 2005 and power connection key 2006 on guidance panel 2003, have been equipped with.Ground wire 2008 is connected with earth terminal 2007 on being provided in main body 2001, so that with main body 2001 ground connection.Label 2009 indication power lines.
Fig. 8 representative is according to the circuit diagram of the microwave oven of fourth embodiment of the invention.
As shown in Figure 8, power supply is connected with the contact of relay 2010, and is connected with radio-frequency generator 2012 from power line 2009, contact by another relay 2011.Relay 2010 is corresponding to master switch facility of the present invention.Radio-frequency generator 2012 forms by layouts such as magnetrons, and magnetron produces microwave, so that heating and the corresponding food of material that will heat.As load of the present invention, radio-frequency generator 2012 has been described in the fourth embodiment of the present invention.Label 2013 indicating controller spares and give control device 2013 with supply of electric power by lower pressure transducer 2014.In control device 2013, be equipped with microcomputer 2015, keyboard 2005, worked display unit 2004 and the memory device 2016 of notifying the device effect.Microcomputer 2015 controls are handled the operation of operation and relay 2010 and 2011 from the Signal Processing operation from keyboard 2005 of outside input, the demonstration of display unit 2004.Label 2017 illustrates the shell by ground wire 2008 ground connection of main body 2001.Be provided among the electric wire 2009a that is derived from power line 2009 with the corresponding zero phase current transformer 2018 of current detector, so that zero phase current transformer 2018 detects the generation of unsymmetrical current among the electric wire 2009a.Unsymmetrical current is caused by following reason: that is exactly, the electric current that electric wire 2009a in zero phase current transformer 2018 back supplies is because of ageing of insulation, or it is relevant with electric wire 2009a, with the radio-frequency generator 2012 that is connected with electric wire 2009a (promptly, load) earth fault relevant with control device 2013 leaks out with the ground that is connected with shell 2017 from the shell 2017 of main body 2001.Label 2019 shows the electric leakage that output with zero phase current transformer 2018 converts the signal level that can be judged by microcomputer 2015 to and judges device.For example, surpass under the situation of 10mA at unsymmetrical current, 2019 outputs of electric leakage judgement device have the output voltage with the supply voltage of microcomputer 2015 corresponding " Vdd " level.When unsymmetrical current was less than or equal to 10mA, electric leakage judgement device 2019 was exported the output voltage of " Vss " level of the reference potential with microcomputer 2015.According to the output signal of electric leakage judgement device 2019, microcomputer 2015 judges whether to leak electricity.In addition, according to the condition of considering such as the operating time till the disconnection of the contact of relay 2010 after detecting electric leakage, the value of this unsymmetrical current is arranged to not the value that can have a negative impact to human body.The switch that the contact of label 2020 indications and relay 2010 is connected in parallel.Switch 2020 is designed to by pressing the power connection key 2006 that is provided on the main body 2001 and closure.
Describe now and relevant operation and the effect of microwave oven of using above-mentioned layout.
At first, under the state that disconnects in the contact of relay 2010, supply of electric power is given control device 2013 and radio-frequency generator 2012 both, cause microwave oven to enter standby mode.When the user used microwave oven, at first, the user pressed power connection key 2006.Consequently, switch 2020 closures, and electric power is fed to control device 2013 from lower pressure transducer 2014, and control device 2013 begins operation.Judge the output signal of device 2019, do not take place to be provided in the contact of microcomputer 2015 closing relays 2010 in the device 2013 under the situation of electric leakage from electric leakage in response.Because the closing of contact of relay 2010 is given control device 2013 with supply of electric power subsequently, and make it continue operation.
Then, when the user by handling 2005 input culinary art pattern and heating times of keyboard, and during by keyboard 2005 input initiation commands, relay drive unit 2021b response is from the output of microcomputer 2015, the contact of closing relay 2011.Thereby electric power is supplied to radio-frequency generator 2012 with the generation microwave, thus heat food.When finishing culinary art, microcomputer 2015 disconnects the contact of relay 2011.Finish all culinary arts like this, microwave oven is converted under the situation of standby mode then, and the user is by handling keyboard 2005 input power supply ON-and OFF-commands, so that disconnect the contact of relay 2010.Consequently, microwave oven changes standby mode into.
Alternately, input operation for fear of the trouble of this power supply ON-and OFF-command, perhaps after using microwave oven, the user forgets the situation of input power supply ON-and OFF-command, for example provide can not make the user produce the stand-by period of the inconvenience sense relevant with the input operation of keyboard 2005 in, can be equipped with the automatic power break function for microwave oven, promptly, when the user does not carry out any operation in this stand-by period, microcomputer 2015 can disconnect the contact of relay 2010, so that microwave oven is converted to standby mode.
In addition, when judging the closing of contact of device 2019 at relay 2010, electric leakage judges that microcomputer 2015 is the contact of block system relay 2010 immediately, to improve fail safe under the situation that electric leakage has taken place.
And in the 4th embodiment, in the situation of microcomputer 2015 faults, microwave oven receives electric leakage with relay drive unit 2021a and judges that the mode of the output signal of device 2019 provides.Judge the output signal of device 2019 when electric leakage and constitute when having the signal of " Vdd " level, relay drive unit 2021a can with the output signal that is derived from microcomputer 2015 irrespectively, the response electric leakage judges the output signal of device 2019 and the contact of opening relay 2010.
In addition, judge that in electric leakage device 2019 judgements have taken place under the situation of electric leakage, microcomputer 2015 shows wrong indication on display unit 2004, and, when the closing of contact of relay 2010, microcomputer 2015 disconnects the contact of relay 2010, to cut off electric wire 2009a, stops electric leakage being taken place the supply of electric power of part.Even the contact of relay 2010 is disconnected, because such as the such structure fully of the smmothing capacitor that provides on the primary side of the lower pressure transducer 2014 of supply of electric power being given control device 2013, control device 2013 can continue to show a period of time with the mistake indication on display unit 2004.Consequently, microcomputer 2015 can be with the user that notifies of electric leakage.Can easily prolong the time period of continuing to show this wrong indication by the electric capacity that increases above-mentioned smmothing capacitor.In addition, show the wrong time period, can alternately provide additional electric leakage display unit and the stand-by power supply of the display unit that only is used to leak electricity in order further to prolong.When the driving voltage of control device 2013 become be lower than can drive controlling device 2013 supply voltage the time, control device 2013 stops to be converted to standby mode.
In addition, judge that in electric leakage device 2019 judges when electric leakage has taken place, microcomputer 2015 with wrong indicated number on display unit 2004, and, error message is stored in the memory device 2016 that is provided in the control device 2013; In addition, when the closing of contact of relay 2010, the contact that microcomputer 2015 disconnects relays 2010 also cuts off electric wire 2009a, thereby stops the supply of electric power to the electric leakage scene.
In addition, microcomputer 2015 following demonstrations are wrong indicates and storage errors information in memory device 2016: that is exactly, when the closing of contact of relay 2010, microcomputer 2015 at first disconnects the contact of relay 2010, then, owing to when continuing operation, show as mentioned above and stored information such as the such reserve structure of the smmothing capacitor of the primary side that is provided in the lower pressure transducer 2014 of supply of electric power being given control device 2013, control device 2013.Consequently, microcomputer 2015 can more promptly cut off electric wire 2009a, so that stop the supply of electric power to the electric leakage scene.
In addition, owing to depend on that such as the cooking equipment of microwave oven the food during the culinary art may produce a large amount of steam, it produces interim dew and drips, and may leak electricity in some place.When once in a while electric leakage taking place, microcomputer 2015 judges that according to electric leakage the output signal of device 2019 disconnects the contact of relay 2010, so that control device 2013 shut-down operations, to be converted to standby mode.Reveal to drip and to cause interim electric leakage, its just disappearance a little while.Near the user microwave oven may not ignore the generation of this electric leakage.Under these circumstances, when the user handles power connection key 2006 once more, so that during the operation microwave oven, electric leakage judges that device 2019 does not detect the generation of electric leakage, and can operate under normal condition.In some cases, above-mentioned phenomenon can be used as and reproduce fault and assert that (claim) manages.Assert in order to accept such fault of can not reproducing, in advance in the memory device 2016 of content stores in being provided in control device 2013 with mistake.User or attendant be with keyboard 2005 input error call instructions, thus content that can call error.
As previously mentioned, in the 4th embodiment, when microwave oven is in standby mode, be cut to electric wire, its minimizing electric leakage or the risk of getting an electric shock and causing of load and control device such as the master switch facility of relay.In addition, owing to there is not unwanted power consumption, can reduce non-firm power.
In the 4th embodiment, used power connection key 2006; And when supressing power connection key 2006, and switch 2020 is closed so that when giving control device 2013 with supply of electric power, and microwave oven begins operation.Alternately, can design like this,, can make switch 2020 closures when opening door 2002 the time.Consequently, no longer need power connection key 2006, therefore, can omit the operation that the user presses the trouble of power connection key 2006 when culinary art.
(embodiment 5)
Fig. 9 is the circuit diagram of the microwave oven of the 5th embodiment according to the present invention.Should be understood that the same numeral that will be presented among the embodiment 4 is used as those labels of the structural elements of expression embodiment 5, and omit description of them.As with the difference of the 4th embodiment, under the situation that has been equipped with several loads of the present invention, in the 5th embodiment, except radio-frequency generator 2012, also used heater 2022.Consequently, electric furnace function and baking function are additionally provided.Both can operate radio-frequency generator 2012 and heater 2022 or power by cut-off/close relay 2011, relay 2023 and relay 2024.In the control signal that receives microcomputer 2015, drive these relays 2011,2023 and 2024 by relay drive unit 2021c.
Then, when utilizing the microwave high-frequency heat food, relay 2011 closures so that give radio-frequency generator 2012 with supply of electric power, thereby therefrom produce microwave and with microwave irradiation on food.When heater 2022 heat food, relay 2023 and 2024 both closures so that give heater 2022 with supply of electric power, cause heater 2022 to produce heat, thus heat food.
In such layout, for example, when the ageing of insulation of the insulation of heater 2022 and shell 2017, unless relay 2023 and 2024 both's closures, otherwise to heater 2022 power supplies.Consequently, can not detect electric leakage.Under these circumstances, when the procedure stores that will be used for checking in advance during at microcomputer 2015, because the instruction of the program that the user is used to check with keyboard 2005 input execution, can all loads of automatic switch, so that operate.Consequently, microcomputer 2015 can check in heater 2022 and radio-frequency generator 2012 whether electric leakage has taken place.In the 5th embodiment, heater 2022 and radio-frequency generator 2012 are being described as under the situation of two loads.When having used more than two loads in electrical equipment, it is more effective that above-mentioned earth detection may become.In addition, when during checking detecting electric leakage, be used for the mistake indication that electric leakage was being operated and taken place to notification payload because display unit 2004 shows, this wrong indication can cause the effective information that can indicate the electric leakage scene.
(embodiment 6)
Figure 10 is the circuit diagram that master switch facility is provided in the microwave oven in the electric wire of control device.Should be noted that, the same numeral that is presented among the 4th embodiment is used as those labels of representing the structural elements among the 6th embodiment.The following different structure point that provides with the 4th embodiment: that is exactly, when the electric wire 2009a that is provided in control device 2013 with the corresponding relay 2025 of master switch facility of the present invention goes up, be connected with electric wire 2009a with another relay 2011 via another relay 2026 with the corresponding radio-frequency generator 2012 of load.
Describe now and relevant operation and the effect of microwave oven of using above-mentioned layout.
At first, under the state that disconnects in the contact of relay 2025, electric power be not supplied to control device 2013 and radio-frequency generator 2012 both so that microwave oven enters standby mode.When the user used microwave oven, at first, the user pressed power connection key 2006 with Closing Switch 2020.Lower pressure transducer 2014 begins to supply power to control device 2013 then, to operate.When the microcomputer 2015 in being provided in control device 2013 judges that according to electric leakage the output signal of device 2019 is judged not generation electric leakage, the contact of microcomputer 2015 closing relays 2025.Because the closing of contact of relay 2025 is given control device 2013 with supply of electric power subsequently, so that make it continue operation.
Then, the user imports culinary art pattern and heating times with keyboard 2005, and with keyboard 2005 input initiation commands, so that relay drive unit 2021d response is from the output of microcomputer 2015, the contact of the contact of closing relay 2011 and relay 2026.Thereby, give radio-frequency generator 2012 with supply of electric power, so that produce microwave, thus heat food.When finishing culinary art, microcomputer 2015 disconnects the contact of relay 2011 and the contact of relay 2026.When having finished all culinary arts, when microwave oven changed standby mode into subsequently, the user imported the power supply ON-and OFF-commands with keyboard 2005, and to disconnect the contact of relay 2025, it makes microwave oven enter standby mode.
Alternately, input operation for fear of the trouble of this power supply ON-and OFF-command, or after using microwave oven, the user forgets under the situation of input power supply ON-and OFF-command, for example provide can not make the user have the stand-by period of the inconvenience sense relevant with the input operation of keyboard 2005 in, can provide the function of cutting off the electricity supply automatically for microwave oven, promptly, when the user does not carry out any operation in this stand-by period, microcomputer 2015 can disconnect the contact of relay 2025, so that microwave oven enters standby mode.
In addition, when the contact of device 2019 at closing relay 2025 judged in electric leakage, judge under the situation that electric leakage has taken place, microcomputer 2015 immediately the contact of block system relay 2025 to improve fail safe.
In addition, judging in electric leakage that device 2019 was judged in high-frequency heating operating period has taken place under the situation of electric leakage, microcomputer 2015 disconnects relay 2011 and 2026, so that stop the power supply to radio-frequency generator 2012, and makes display unit 2004 show wrong indication.In addition, even the powered operation of working as radio-frequency generator 2012 has stopped, when electric leakage judged that electric leakage has taken place in device 2019 judgements, microcomputer 2015 disconnected relays 2025 to stop microwave oven.
As previously mentioned, in the 6th embodiment, when microwave oven was in standby mode, master switch facility was cut to the electric wire of control device, and, cut off load such as another switchgear of relay from electric wire.Consequently, can reduce the risk that causes by electric leakage or electric shock, and, can reduce non-firm power owing to there is not unnecessary power consumption.
Though described the present invention in detail with reference to specific embodiment, apparent for the person of ordinary skill of the art, technical scope of the present invention be can not depart from and spiritual various modifications and change made.Present patent application requires the priority of Japanese patent application JP 2005-338210 that proposes in the Japanese patent application JP2006-101760 that proposed on April 3rd, 2006, on November 24th, 2005 and the Japanese patent application JP 2005-245618 that proposed on August 26th, 2005, quotes in full for your guidance hereby.
Industrial Applicability A
As previously mentioned, in electrical equipment according to the present invention, can eliminate electric-leakage detection circuit and be in stand-by set of dies Power consumption under the formula, and do not damage the effect of the electric leakage interrupt function that can prevent from leaking electricity or get an electric shock. Its result That this electrical equipment also can be applied to reduce the use of the power consumption of the household electrical appliance that are equipped with the electric leakage interrupt function The field. In addition, in heating cooking apparatus according to the present invention, can eliminate electric-leakage detection circuit and be in Power consumption under the standby mode, and do not damage the effect of the electric leakage interrupt function that can prevent from leaking electricity or get an electric shock. Consequently, this heating cooking apparatus also can be applied to reduce the household electric that is equipped with the electric leakage interrupt function The use field of the power consumption of device, and again be equipped with at household electrical appliance the leakage that provides in traditional electrical equipment is provided When the electric leakage interrupt function of scheme is determined in electrolysis, it must be reduced to as far as possible in the function under the standby mode Another little use field.

Claims (22)

1. electrical equipment comprises:
Use the appliance body of AC power supplies; With
Be provided in the power subsystem in the described main body, it is connected to the described AC power supplies of input so that dc voltage and AC voltage are outputed to described appliance body;
Wherein, described power subsystem comprises:
Be used for input AC power supplies voltage transitions is become the power circuit of the DC supply voltage of isolating with described AC power supplies electricity; With
Be used to connect and cut off the relay that the AC power supplies voltage of appliance body is supplied.
2. electrical equipment according to claim 1, wherein, described power subsystem comprises:
Be provided in the contact of described relay and the leakage inductance slowdown monitoring circuit between the described appliance body, be used for detecting the electric leakage that occurs at described appliance body, so that cut off described relay.
3. electrical equipment according to claim 2, wherein, when described appliance body during at standby mode, this appliance body cuts off described relay.
4. electrical equipment according to claim 2, wherein, described appliance body comprise the control unit that is used for control apparatus and
Described control unit uses the dc voltage that applies from power subsystem to operate, and control is to the dc voltage supply of relay and leakage inductance slowdown monitoring circuit.
5. electrical equipment according to claim 4, wherein, when electrical equipment was in standby mode, described control unit stopped the dc voltage supply to relay and leakage inductance slowdown monitoring circuit.
6. electrical equipment according to claim 2, wherein, described power subsystem comprises noise filter circuit at the input side of AC power supplies, and described power subsystem provides as individual unit.
7. heating cooking apparatus comprises:
Load;
Control the control unit of described load;
The power subsystem of described control unit;
To give the electric power supply unit of described control unit from the supply of electric power of described power subsystem;
Signal is applied to described electric power supply unit so that the initialize signal generation unit of beginning supply of electric power;
Source power supply voltage is applied to the electric wire of described load and described power subsystem;
The current detecting unit of the unsymmetrical current of described electric wire is flow through in detection; With
According to signal, judge whether to exist the electric leakage judging unit of electric leakage from described current detecting unit output;
Wherein, do not supply the standby mode of electric power, begin the supply of supply voltage in response to the signal of described initialize signal generation unit, thereby described control unit and described electric leakage judging unit begin their operation in described electric power supply unit; And,
Wherein, if the signal of described electric leakage judging unit is normal, so, described electric power supply unit continues supply electric power, thereby described control unit and described electric leakage judging unit continue operation, and described electric power supply unit stop supplies electric power.
8. heating cooking apparatus according to claim 7, wherein, described initialize signal generation unit comprises the crew-served door switch of opening with door.
9. heating cooking apparatus according to claim 7, wherein, described heating cooking apparatus comprises the switchgear of the connection between cut-off/close load and the electric wire; And under the abnormal situation of the signal of described electric leakage judging unit, described control unit disconnects described switchgear.
10. heating cooking apparatus according to claim 7, wherein, described heating cooking apparatus further comprises the mains switch with function of reset, is used for the connection between cut-off/close load and the power subsystem; And under the abnormal situation of the signal of described electric leakage judging unit, described control unit disconnects described mains switch.
11. heating cooking apparatus according to claim 7, wherein,
Described heating cooking apparatus comprises:
Mains switch with function of reset is used for the connection between cut-off/close load and the power subsystem; And the switchgear of the connection between cut-off/close load and the electric wire; Wherein,
Under the abnormal situation of the signal of described electric leakage judging unit, described control unit disconnects described switchgear, and after this, when the signal of described electric leakage judging unit was still undesired, described control unit disconnected described mains switch.
12. according to any one described heating cooking apparatus of claim 9 to 11, wherein, described heating cooking apparatus further comprises notification unit; And when the signal of described electric leakage judging unit is undesired, the generation of described notification unit notice electric leakage.
13. heating cooking apparatus according to claim 12, wherein in the generation of notice electric leakage, described control unit does not allow described electric power supply unit stop supplies electric power.
14. an electrical equipment comprises:
Load;
Control the control unit of described load;
Supply voltage is supplied to the electric wire of described load and described control unit;
The current detecting unit of the unsymmetrical current of described electric wire is flow through in detection;
According to signal, judge whether to exist the electric leakage judging unit of electric leakage from described current detecting unit output;
The master switch facility of the described electric wire of cut-off/close; With
The switch that is connected in parallel with described master switch facility; Wherein,
During the standby mode that described master switch facility disconnects, closed described switch, so that beginning power supply voltage, thereby described control unit begins operation; When described electric leakage judgment unit judges was leaked electricity, because the closed described master switch facility of control unit, even switch disconnects, control unit was also proceeded operation, and control unit disconnects described master switch facility to be converted to standby mode.
15. electrical equipment according to claim 14 wherein, takes place in described electric leakage judgment unit judges under the situation of electric leakage, described control unit disconnects described master switch facility.
16. electrical equipment according to claim 14, wherein, under the situation that existence does not change in the given time, described control unit disconnects described master switch facility.
17. electrical equipment according to claim 16 wherein, even when also not passing through described scheduled time, takes place in described electric leakage judgment unit judges under the situation of electric leakage, described control unit disconnects described master switch facility.
18. according to claim 14 or the described electrical equipment of claim 17, wherein, described control unit further comprises notification unit; And wherein, taken place in described electric leakage judgment unit judges under the situation of electric leakage, described control unit exercise notice, and disconnect described master switch facility.
19. electrical equipment according to claim 14, wherein, described control unit further comprises memory cell; And taken place in described electric leakage judgment unit judges under the situation of electric leakage, because the information stores of described electric leakage in memory cell, therefore derives described information from described control unit.
20. electrical equipment according to claim 14, wherein, described control unit further comprises memory cell and notification unit; With
Take place in described electric leakage judgment unit judges under the situation of electric leakage, described control unit with the information stores of described electric leakage in memory cell, even and when described electric leakage judgment unit judges was leaked electricity, also notice was stored in the information of the described electric leakage in the memory cell.
21. electrical equipment according to claim 14, wherein, described control unit further comprises microcomputer; With
Described microcomputer is equipped with the load that operation is connected with electric wire under predetermined state so that check the normal audit program that judges whether that described electric leakage judging unit makes, and described microcomputer is carried out audit program by scheduled operation.
22. electrical equipment according to claim 21, wherein, described control unit further comprises notification unit; And carry out the result of described audit program by described notification unit notice.
CN2006800311964A 2005-08-26 2006-08-25 Electric device and heating cooking device Active CN101248706B (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
JP2005245618A JP2007059308A (en) 2005-08-26 2005-08-26 Electric equipment
JP245618/2005 2005-08-26
JP2005338210A JP5050340B2 (en) 2005-11-24 2005-11-24 Cooker
JP338210/2005 2005-11-24
JP2006101760A JP4946140B2 (en) 2006-04-03 2006-04-03 Electrical equipment
JP101760/2006 2006-04-03
PCT/JP2006/316768 WO2007023961A1 (en) 2005-08-26 2006-08-25 Electric device and heating cooking device

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Cited By (3)

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CN103999547A (en) * 2011-12-20 2014-08-20 松下电器产业株式会社 Microwave heating device
CN109884942A (en) * 2019-03-01 2019-06-14 广东美的厨房电器制造有限公司 The control system and electric appliance of electric appliance
CN109983836A (en) * 2016-11-24 2019-07-05 兰西蓄能简易股份有限公司 Electric radiator type heating equipment including electric pressure converter

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KR101495217B1 (en) 2014-01-20 2015-02-24 주식회사 리홈쿠첸 Standby power reduction type electric range

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DE69940094D1 (en) * 1998-11-19 2009-01-29 Sharp Kk Microwave heater with standby state

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103999547A (en) * 2011-12-20 2014-08-20 松下电器产业株式会社 Microwave heating device
CN103999547B (en) * 2011-12-20 2016-02-24 松下电器产业株式会社 Microwave heating equipment
US9609698B2 (en) 2011-12-20 2017-03-28 Panasonic Intellectual Property Management Co., Ltd. Microwave heating device
CN109983836A (en) * 2016-11-24 2019-07-05 兰西蓄能简易股份有限公司 Electric radiator type heating equipment including electric pressure converter
CN109983837A (en) * 2016-11-24 2019-07-05 兰西蓄能简易股份有限公司 Electric radiator type heating equipment including electric pressure converter
CN109983836B (en) * 2016-11-24 2022-05-03 兰西蓄能简易股份有限公司 Electric radiator type heating device comprising a voltage converter
CN109983837B (en) * 2016-11-24 2022-07-08 兰西蓄能简易股份有限公司 Electric radiator type heating device comprising a voltage converter
CN109884942A (en) * 2019-03-01 2019-06-14 广东美的厨房电器制造有限公司 The control system and electric appliance of electric appliance

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