CN101596074A - Relay control device and cooking machine - Google Patents
Relay control device and cooking machine Download PDFInfo
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- CN101596074A CN101596074A CN 200910142980 CN200910142980A CN101596074A CN 101596074 A CN101596074 A CN 101596074A CN 200910142980 CN200910142980 CN 200910142980 CN 200910142980 A CN200910142980 A CN 200910142980A CN 101596074 A CN101596074 A CN 101596074A
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Abstract
The invention provides a kind of relay control device and cooking machine.In the relay control device that the heater even load is controlled with relay, the switching instant that output voltage carries out to the voltage that can supply with more than the maintenance voltage that keeps electric current from the voltage that can supply with more than the faradic induced voltage can with setting that influences such as condenser capacity, relay-coil resistance have nothing to do, thereby can guarantee long-term use.AC power (1) switches to dc source by first DC power supply circuit (4), switch to the voltage lower by second DC power supply circuit (14) again than the output voltage of first DC power supply circuit, by control part (15) conducting or the disconnection of relay are controlled, first DC power supply circuit has a plurality of output voltages, and the driving electric power of relay is supplied with by first DC power supply circuit according to the control signal of control part.
Description
Technical field
The present invention relates to a kind of relay control device of the heater even load being controlled by relay and the cooking machine that comprises this relay control device.
Background technology
In the past, when the heater even load is controlled with relay, be used for driving the following control method of power circuit employing of relay: when in the coil of relay, not having electric current to flow, export the voltage higher than the induced voltage of relay; And when the coil of relay has electric current to flow, then export and force down than relay induced electricity but keep the high voltage (example wherein can be opened flat 8-266800 with reference to the Japanese patent gazette spy) of voltage than relay
In the above referred-to references, being used for driving the voltage of voltage regulation circuit that the power circuit of relay is made up of commutation diode, resistance, Zener diode and smmothing capacitor constitutes, and the output voltage of this power circuit detected, when output voltage when deciding output voltage is above, just make relay begin to connect, be switched to the time that relay drives thereby shorten AC power.Simultaneously, when relay coil has electric current to flow through, then reduce the output voltage of power circuit, reduce the electric current of relay coil, thereby suppressed the heating of relay coil.
But, adopt such circuit to constitute, for having electric current to flow through in the relay coil and not having electric current to flow through, the output voltage of corresponding power circuit will change, and the capacity of the smmothing capacitor that is connected with the output of power circuit or the capacitor volume that is connected in parallel at the relay coil two ends need be designed to optimum value like this.Yet because capacitor time one long deterioration can take place, the time constant of capacitor and coil will diminish, and exists the problem that time (in other words conj.or perhaps relay coil being applied the time of induced voltage) that the induced-current of relay flows through can shorten.
In addition, if consider the long deterioration that can take place of capacitor time one, the faradic flushing time of relay still can be guaranteed later for many years, capacitor volume just must increase, capacitor also will maximize, and can bring device volume to become big problem like this.
Also have, when relay coil does not have electric current to flow through, the supply voltage that is used for driving relay increases, and the voltage that is added on other circuit part's product outside the relay also increases, and the electric current that other circuit part's product outside relay flow through also increases along with applying increasing of voltage.Like this, when the coil of relay does not have electric current to flow through that is device when not using, the power consumption in the time of can standby taking place is also with the problem that increases.
Summary of the invention
The present invention makes in order to solve problems of the prior art, set switching instant that output voltage carries out to the voltage that can supply with more than the maintenance voltage that keeps electric current from the voltage that can supply with more than the faradic induced voltage can with condenser capacity, influence such as relay-coil resistance is irrelevant, thereby can guarantee that long-term the use is first purpose of the present invention.
Also have, relay can use for a long time, and it is second purpose of the present invention that the very long cooking machine of a kind of product life is provided.
In order to reach first purpose, relay control device of the present invention comes conducting or disconnection by relay in the current path of load and AC power, AC power switches to dc source by first DC power supply circuit, the output voltage of first DC power supply circuit is transformed into the voltage lower than the output voltage of first DC power supply circuit by second DC power supply circuit, by the control part that is carried out the electric power supply by second DC power supply circuit conducting and the disconnection of relay is controlled.First DC power supply circuit has a plurality of output voltages, and the driving electric power of relay will be supplied with by first DC power supply circuit according to the control signal of control part.Control part is when the relay conducting, the output voltage of setting first DC power supply circuit is for can supply with value more than the faradic induced voltage of relay, begin after the stipulated time from the relay conducting, the output voltage of first DC power supply circuit is set at can supply with the above value of maintenance voltage that relay keeps electric current.
Like this, according to the relay ON time, control part can switch the output voltage that relay coil is carried out first DC power supply circuit of electric current supply, so, can set the switching instant that output voltage carries out to the voltage that can supply with more than the maintenance voltage that keeps electric current from the voltage that can supply with more than the faradic induced voltage, do not constituted the condenser capacity of first DC power supply circuit, influences such as relay-coil resistance, be not subjected to simultaneously the formation portion product capacitor influence of deterioration all the year round of first DC power supply circuit yet, can guarantee the long-term use of relay control device.
Also have, cooking machine of the present invention in order to reach above-mentioned second purpose, includes above-mentioned relay control device.
Therefore, because relay can use for a long time, can provide a kind of product life very long cooking machine.
The technique effect that the present invention produces is as follows.Relay control device of the present invention can be set the output voltage of the power circuit (first DC power supply circuit) of supplying with the relay coil electric current by control part, control part can be to the output voltage of first dc source of supplying with the relay coil electric current according to the relay ON time, switch to the voltage that to supply with more than the maintenance voltage that keeps electric current by the voltage that can supply with more than the faradic induced voltage, to not be subjected to the capacitor influence of deterioration all the year round like this as the first DC power supply circuit formation portion product, can the product miniaturization of assurance portion, relay control device also can guarantee long-term use.
In addition, cooking machine of the present invention because relay can use for a long time, can provide a kind of product life very long cooking machine.
Specific embodiments of the present invention is summarized as follows.Relay control device in the present invention's the 1st scheme comprises: AC power, load, the current path of above-mentioned load and above-mentioned AC power is carried out the relay of conducting or disconnection, above-mentioned AC power is converted to first DC power supply circuit of dc source, the output voltage of above-mentioned first DC power supply circuit is switched to second DC power supply circuit lower than the first DC power supply circuit voltage, electric power is supplied with and the conducting of control relay and the control part of disconnection with being undertaken by second DC power supply circuit.Above-mentioned first DC power supply circuit has a plurality of output voltages, the driving electric power of above-mentioned relay is supplied with by first DC power supply circuit according to the control signal of control part, above-mentioned control part is when above-mentioned relay conducting, the output voltage of first DC power supply circuit is set at the value that can supply with more than the faradic induced voltage of relay, begin after the stipulated time from the relay conducting, the output voltage of first DC power supply circuit is set at the value that to supply with more than the maintenance voltage that relay keeps electric current.Like this, control part can switch the output voltage of first DC power supply circuit of supplying with the relay coil electric current according to the ON time of relay, so, output voltage carries out switching instant by the voltage that can supply with more than the faradic induced voltage to the voltage that can supply with more than the maintenance voltage that keeps electric current, can be set as the condenser capacity that is not subjected to constitute first DC power supply circuit, influences such as the resistance of relay coil, therefore be not subjected to the first DC power supply circuit formation portion product capacitor influence of deterioration all the year round yet, can guarantee the long-term use of relay control device.In addition, under the very long situation of relay ON time, the output voltage of first DC power supply circuit also can be littler than the induced voltage of relay, bigger than maintenance voltage, and the output voltage of second DC power supply circuit is also very low, like this, the consumption electric power of relay control device also can be very little.
The 2nd scheme is, on the basis of the 1st scheme, relay control device is, when control part disconnects at relay, the output voltage of setting first DC power supply circuit is than supplying with the lower voltage of faradic induced voltage, and the output voltage of above-mentioned first DC power supply circuit is set at and is worth more than the induced voltage before the relay conducting, like this, because the output voltage step-down of second DC power supply circuit, the consumption electric power of second DC power supply circuit has also reduced, electric power when relay control device stops to move that is to say that stand-by electric also can reduce.
The 3rd scheme is, on the basis of the 2nd scheme, relay control device is, when control part disconnects at relay, the output voltage of setting first DC power supply circuit is the lower voltage of maintenance voltage that keeps electric current than supplying with, when relay disconnects, even control part sends the control signal of conducting under the influence of foeign element, do not connect because relay coil is supplied with the contact of electric current, thereby the contact of relay can not connect the relay control device of the safety of load conducting mistakenly when can provide a kind of relay control device to be failure to actuate.Also have, because the voltage of second dc source output is very low, the consumption electric power of second DC power supply circuit is also just very low, can reduce the stand-by electric of relay control device.
The 4th scheme is that on the basis of the 1st scheme, relay control device also comprises the voltage detection department that detects the first DC power supply circuit voltage.Control part is when the relay conducting, and the detected voltage of above-mentioned voltage detection department is when the induced voltage of above-mentioned relay is following, and control relay does not begin conducting, thereby can prevent the generation of relay induced-current undersupply state when conducting.In addition, come turn-on relay, can prevent the generation that relay tip is bad by using the electric current littler than induced-current.
The 5th scheme is, on the basis of the 1st scheme, relay control device also comprise be used for producing with the no-voltage synchronizing signal generating unit of the synchronous signal of the no-voltage of AC power, be used for measuring above-mentioned no-voltage synchronizing signal generating unit output time timer, be used for the timing setting portion that sets to the period of relay conducting or disconnection from no-voltage synchronizing signal generating unit output signal.Conducting and disconnection that the output of period that control part is set according to above-mentioned timing setting portion and above-mentioned timing portion comes control relay, change is equally rotated with the sign change of the phase place of above-mentioned similar AC power of period by above-mentioned timing setting portion, like this, the current average that flows into relay tip approaches zero, suppress the transfer of relay tip metal, improved the durability of relay tip.
The 6th scheme is that on the basis of the 1st scheme, relay control device comprises a plurality of loads, the current path of above-mentioned a plurality of loads and AC power carried out a plurality of relays of conducting or disconnection respectively.Control part is in above-mentioned a plurality of relays during a conducting, no matter other relay is in conducting state or off-state, the output voltage of first DC power supply circuit will be set at can supply with the above value of the faradic induced voltage of above-mentioned relay, then, at the appointed time, the output voltage of first DC power supply circuit will be set at can supply with the above value of maintenance voltage that above-mentioned relay keeps electric current, so also just there is no need optimum circuit, can reduce portion's product of forming circuit to each relay additional services relay coil electric current.In addition, when the relay conducting, at first, the output voltage of first DC power supply circuit will switch to the above value that can supply with the faradic induced voltage of relay, in stipulated time after the relay conducting, the output voltage of first DC power supply circuit will switch to the above value of the maintenance voltage of the maintenance electric current that can supply with relay, thus, relay control device is irrelevant with relay quantity, can guarantee that relay moves in action assurance scope, thereby can improve the reliability of relay control device.
The 7th scheme is that on the basis of the 6th scheme, relay control device also comprises the plural relay that induced-current is different.Control part is when the relay conducting, in the middle of the above-mentioned different induced-current, can supply with the output voltage that maximum faradic induced voltage is set as first DC power supply circuit, can reduce the setting value number of the output voltage of first DC power supply circuit like this, also can reduce the formation portion product of relay control device, the control of relay can be simpler.Also have, because can flow through the above electric current of maximum induced-current in the induced-current of a plurality of relays, even the different relay of induced-current is switched on simultaneously, induced-current deficiency, relay tip that relay also can not take place connect non-persistent state, thereby can prevent the bad of relays such as relay tip failure welding.
The 8th scheme is that on the basis of the 7th scheme, relay control device comprises the different plural relay of maintenance electric current.Control part is when the relay conducting, in the middle of the above-mentioned different induced-current, can supply with the output voltage that maximum faradic induced voltage is set as first DC power supply circuit, after relay is conducting to the stipulated time, above-mentioned different the maintenance in the middle of the electric current, the maintenance voltage that can supply with maximum maintenance electric current is set as the output voltage of first DC power supply circuit, can reduce the setting value number of the output voltage of first DC power supply circuit like this, also can reduce the formation portion product of relay control device, the control of relay can be simpler.Because can flow through the maximum above electric current of electric current that keeps in the maintenance electric current of a plurality of relays, even keep the different relay of electric current to be switched on simultaneously, also can prevent the maintenance undercurrent of relay, owing to connection that can not the guard relay contact can not be switched on load.Also have, also can suppress since relay keep undercurrent cause can not the guard relay contact connection, it is soldered by the contact that electric spark causes to produce electric spark as a result between the separation of relay tip, the relay tip.
The 9th scheme is that on the basis of the 1st scheme, relay control device comprises near the temperature detecting part of the detected temperatures of relay.Control part will be according to the output of said temperature test section, change the output voltage of first DC power supply circuit, even the resistance of relay is owing to ambient temperature changes, the output voltage of first DC power supply circuit also can change according to the variation of detected this environment temperature, can guarantee relay induced-current and the normal supply that keeps electric current, can prevent that also relay tip can not be connected, thereby can prevent to keep separating and then the load that causes can not be switched on owing to contact.
The cooking machine of the 10th scheme comprises the relay control device of wantonly 1 scheme record in the above-mentioned 1-9 scheme.Because relay can use for a long time, can provide a kind of product life very long cooking machine.Also have, because cooking machine etc. all will heat, temperature when using usually around the relay control device all can be very high, it is generally acknowledged that electrolytic capacitor can be than easier wearing out such as AV machines, like this, by control part the output voltage of first DC power supply circuit is set, because this output voltage can switch, when setting capacitor volume, just there is no need to consider the faradic flushing time and the consumption electric power of relay, can only consider the electrolytic capacitor problem of deterioration all the year round.
Description of drawings
Fig. 1 be the embodiment of the invention 1 relay control device the change of part block diagram circuit diagram,
Fig. 2 is the sectional view that the cooking machine of above-mentioned relay control device is housed,
Fig. 3 is the time sequential routine figure of above-mentioned relay control device,
Fig. 4 be the embodiment of the invention 2 relay control device the change of part block diagram circuit diagram,
Fig. 5 is as the electric cooker sectional view that the cooking machine of above-mentioned relay control device is housed,
Fig. 6 is part operation sequential (first half) schematic diagram of above-mentioned relay control device,
Fig. 7 is part operation sequential (latter half) schematic diagram of above-mentioned relay control device.
Wherein, 1 is AC power, and 2 is heater (load), and 3 is relay tip, and 13 is relay coil (relay), and 14 is second dc power supply circuit, and 115 is control part.
The specific embodiment
With reference to the accompanying drawings specific embodiments of the invention are elaborated.In addition, embodiments of the invention do not have the effect that limits the scope of the invention.
(embodiment 1)
Fig. 1 be the embodiment of the invention 1 relay control device the change of part block diagram circuit diagram.Fig. 2 is the sectional view that the cooking machine of above-mentioned relay control device is housed, and has omitted status of electrically connecting among Fig. 2.
Among Fig. 1, AC power 1 is a mains supply, is example with Japan, general use be 60HZ 100V or 50HZ/100V.Heater 2 constitutes load, and the tubulose spiral heater of being made up of Nie Chrome alloy wire constitutes, and produces near infrared ray.This heater is when adding the voltage of 100V, and power is about 400W.Also have,, also can use the argon gas heater though the tubulose spiral heater that the Shi Nie Chrome alloy wire that uses in the present embodiment is formed can use halogen heater.Relay tip 3 is connected with heater 2, comes the break-make of the current path of control heater 2 and AC power 1 by the switching of relay tip 3.
First DC power supply circuit 4 is used for AC power 1 is switched to dc source, comprises halfwave rectifier smoothing circuit 7 and Switching Power Supply 8.Halfwave rectifier smoothing circuit 7 is formed by diode 5 and capacitor 6.Switching Power Supply 8 is accepted the electric power of halfwave rectifier smoothing circuit 7 and is supplied with and output 12V DC voltage.It is level and smooth that halfwave rectifier smoothing circuit 7 is to use diode 5 and 6 pairs of AC powers of capacitor 1 to carry out halfwave rectifier, switches the DC voltage into about 141V.But this only is an example, and it smoothly also is no problem adopting bridge diode that AC power 1 is carried out full-wave rectification.
Switching Power Supply 8 comprises: by MOSFET constant power semiconductor unit and in the fixed current value range to power semiconductor carry out the built-in control circuit 9 of power semiconductor that the control circuit (not shown) of open and close controlling constitutes, coil 10, smmothing capacitor 11 and for the voltage with capacitor 11 be made as fixed setting value the built-in control circuit 9 of power semiconductor is carried out the output voltage detecting circuit 12 of FEEDBACK CONTROL.
The built-in circuit 9 of power semiconductor charges through 10 pairs of capacitors 12 of coil by built-in MOSFET is carried out open and close controlling in the scope of deciding current value.
Though do not illustrate among the figure, output voltage detecting circuit 12 comprises photoelectricity coupling circuit, 12V Zener diode and 7V Zener diode.Thereby the output voltage by FEEDBACK CONTROL is switched in the switching of being undertaken by these two Zener diodes.
For example, when output voltage is set at about 12V, photoelectricity coupling circuit and Zener diode series connection.When the voltage of capacitor 11 surpasses 12V, the energising of 12V Zener diode, the conducting of photoelectricity coupling circuit, send the signal that output voltage surpasses 12V to the built-in control circuit 9 of power semiconductor, after the built-in control circuit 9 of power semiconductor is received signal, the switch of built-in MOSFET disconnects, and stops the power supply to capacitor 11, and voltage descends; When being lower than 12V, the 12V Zener diode is with no power, the photoelectricity coupling circuit disconnects, send the signal that output voltage is lower than 12V to the built-in control circuit 9 of power semiconductor, after the built-in control circuit 9 of power semiconductor is received signal, the switch conduction of built-in MOSFET charges through 10 pairs of capacitors 11 of coil.
When output voltage was set at about 7V, photoelectricity coupling circuit and the series connection of 7V Zener diode were carried out and top same action.In addition, the output voltage detecting circuit in the present embodiment 12 will be elaborated afterwards.
In other words, the Switching Power Supply in the present embodiment 8 is depressured to the output voltage of about 141V of halfwave rectifier smoothing circuit 7 DC voltage of about 12V.
A terminal of relay coil (relay) 13 is connected with the lead-out terminal of first DC power supply circuit 4.In the present embodiment, the rated voltage of relay coil 13 is 12V.Also have, the DC voltage (induced voltage) that can produce induced-current (being that relay tip is connected to guarantee the driven electric current of relay) is 10V, and (Hold current: the DC voltage irreducible minimum electric current that relay can keep) (maintenance voltage) is 5V can to produce the maintenance electric current.
Though do not illustrate in the drawings, the emitter base diode circuit that second DC power supply circuit 14 is made up of NPN transistor and Zener diode constitutes, be used for the output voltage of Switching Power Supply 8 just the about 12V of output voltage of first DC power supply circuit 4 switch to the voltage that is about 5V lower than the output voltage of first DC power supply circuit 4.
The drive circuit 17 that control part 15 is powered by micro computer 16, to relay coil 13, output voltage setting device 18 that the output voltage of first DC power supply circuit 4 is set etc. constitute.This control part 15 is when second DC power supply circuit 14 is supplied with the DC voltage of about 5V and work.Micro computer 16 is to the high signal or the low signal of the energising or the disconnection of drive circuit 17 output control relay coils 13.
In the relay control device of present embodiment, micro computer 16 is to output voltage setting device 18 output height or low signals, and the detection voltage setting value of the output voltage detecting circuit 12 of first DC power supply circuit 4 is switched.In the present embodiment, when the output voltage setting value of first DC power supply circuit was 12V, micro computer 16 was to output voltage setting device 18 output low signals; When the output voltage setting value of first DC power supply circuit is 7V, to the high signal of output voltage setting device 18 outputs.
The relay control device of present embodiment 16 li of micro computers built-in timer, begin to carry out timing from relay coil 13 energisings, reach the stipulated time after, will switch to the signal of output voltage setting device 18 outputs.
In general, for relay, when relay coil 13 is applied rated voltage, can produce greater than faradic electric current.Therefore, be the relay of 12V if adopt the rated voltage of relay coil, relay tip 3 just can connect reliably.
Here " induced-current " is meant the current value of the relay coil 13 that can make relay tip 3 actions and connect reliably, and this current value also is the specification of relay, is general ground commonly used term.
Output voltage setting device 18 is made of transistor etc., switches the detection voltage setting value of output voltage detecting circuit 12 by transistorized break-make.In the relay control device of present embodiment, when constituting the transistor turns of output voltage setting device 18, the detection voltage of output voltage detecting circuit 12 is 7V; When transistor disconnected, the detection voltage of output voltage detecting circuit 12 was 12V.
As shown in Figure 2, cooking machine body 21 forms case shape structure by the surface through the metallic plate of electroplating processes, heating clamber 22 be by aluminium sheet form can only be towards the casing of a direction unlatching.In the inside of heating clamber 22, end face and bottom surface are equipped with heater 2 (spiral heater), and these two heaters are on circuit and are connected in series.
Relay control device as shown in fig. 1 is installed on the control circuit board 25.In the main circuit that constitutes relay control device shown in Figure 1, except heater 2, some other circuit also is installed, as display units such as switch such as components and parts that heater 2 is controlled, the thermistor that detects heating clamber 22 internal temperatures, touch-switch and LED.Behind user's push button, cooking machine operating process is according to the rules operated.
Roast net 27 is formed by metal, though do not show that in the drawings four angles of Roast net 27 are provided with hook, is arranged on assigned position after these hooks are hung Roast net 27 up.Machine leg 28 is formed by resin, is arranged on four angles of cooking machine body 21.
Below with reference to Fig. 3 the operational circumstances and the effect of the cooking machine of relay control device that present embodiment is housed are described.
Fig. 3 is the operation waveform sequential chart of each several part in the relay control device shown in Figure 1.Wherein, (a) be the on off state schematic diagram of drive circuit 16, (b) be the current waveform schematic diagram of heater 2 and relay tip 3, (c) be the output voltage waveforms schematic diagram of first DC power supply circuit 4, (d) be the on off state schematic diagram of output voltage setting device 17, (e) be the voltage waveform view of AC power 1.
During operation, at first, place gratins such as bread, sesame seed cake on the Roast net 27 of user in heating clamber shown in Figure 2 22.At this moment, the relay control device of Fig. 1 is connected (connection) with AC power 1.Micro computer 16 in the control part 15 sends high signal to output voltage setting device 18.The transistor of output voltage setting device 18 receives conducting behind the high signal, and during transistor turns, the detection voltage setting value of output voltage detecting circuit 12 is 7V just, and so just can controlling first DC power supply circuit 4, to make its output voltage be 7V.
During above-mentioned state, when pressing desirable switch, just can press switch on the control circuit board 25, just can begin with the pairing heating of switch by guidance panel 26 according to the demonstration on the guidance panel 26.
For example, when the switch of guidance panel 26 is pressed, in the t0 moment of Fig. 3, the micro computer 16 of control part 15 sends low signal to output voltage setting device 18, the transistor of output voltage setting device 18 disconnects after receiving low signal, the detection voltage setting value that constitutes the output voltage detecting circuit 12 of first DC power supply circuit 4 is 12V just, so just can control first DC power supply circuit 4 and make its output voltage 12V.
The supply capacity of output voltage changes to 12V from 7V time by the output current of first DC power supply circuit 4 determined.In the present embodiment, output voltage changes to the time that 12V needs 30ms by 7V.
Constantly t1 is that transistor from output voltage setting device 18 turn-offs the moment that begins through behind the 40ms.At moment t1, the micro computer 16 that constitutes control part 15 sends high signal to drive circuit 17.Simultaneously, micro computer 16 uses built-in timer to pick up counting.
During transistor turns in the drive circuit 17, relay coil 13 energisings.At this moment, the electric current of relay coil 13 is supplied with by first DC power supply circuit 4.Because the output voltage of first DC power supply circuit 4 is controlled so as to 12V, even relay coil 13 has electric current to flow through, voltage can not descend yet.
During relay coil 13 energisings, the electromagnetic force that coil produces drives the contact 3 of relay.But,, make connection, the heater 2 of relay tip 3 be switched on and need spend the regular hour owing to contact 3 is that mechanical movement realizes connecting, disconnecting.In the present embodiment, in the big t2 moment behind 7ms, the contact of each relay is connected, and the current path of heater 2 is switched on.
T3 has passed through about 170ms for t1 constantly constantly.The built-in timer of micro computer 16 usefulness is to carrying out timing during this period of time, when minute reaches 170ms, to the high signal of output voltage setting device 18 outputs.
The transistor that constitutes output voltage setting device 18 receives conducting behind this high signal, the detection voltage setting value of the output voltage detecting circuit 12 in first DC power supply circuit 4 becomes 7V, and so just can controlling first DC power supply circuit 4, to make its output voltage be 7V.
Output voltage at first DC power supply circuit 4 is reduced to by 12V in the process of 7V, and the built-in control circuit 9 of power semiconductor does not carry out switch motion.That is output voltage is determined by the capacity of the capacitor 11 in first DC power supply circuit 4 and the resistance value of relay coil 13 to the 7V required time by 12V.In the present embodiment, output voltage is 25ms by 12V to the 7V required time.In the present embodiment, the DC voltage that can produce the maintenance electric current of relay coil 13 is 5V, as long as the output voltage of first DC power supply circuit 4 at 7V, just can be supplied with greater than the electric current that keeps electric current.Simultaneously, be 7V owing to give the output voltage of second DC power supply circuit 14, can suppress the loss of second DC power supply circuit 14 like this, reduced the power consumption of the relay control device except load (heater 2) electric power.
According to upper type, in the relay control device of present embodiment, control part 15 is set at the value that can supply with more than the faradic induced voltage of relay with the output voltage of first DC power supply circuit 4 when the relay conducting, after being conducting to the stipulated time from relay simultaneously, the output voltage of first DC power supply circuit 4 is made as the value that to supply with more than the maintenance voltage that relay keeps electric current.Like this, control part 4 can switch the output voltage of first DC power supply circuit 4 of supplying with relay coil 13 electric currents according to the relay ON time, even constituting the capacity of the capacitor 11 of first DC power supply circuit 4 increases, can guarantee that also supply voltage regularly switches according to institute quarter, the current sinking of relay coil 13 and can be inhibited to the loss that control part 15 carries out second DC power supply circuit 14 that electric power supplies with also there is no need for the current sinking that reduces relay coil 13 serial connection current limitation resistance on relay coil 13.And, under the situation of current limitation resistance that is connected in series, the electric current when starting and also there is no need to be provided with capacitor that relay coil is connected in parallel in order to ensure relay coil.
Also have, in the relay control device of present embodiment, as shown in Figure 3,4 outputs of preceding first DC power supply circuit of the actuating of relay are forced down than induced electricity, for than the high 7V of maintenance voltage.After being arranged to 7V, lack when the loss of second DC power supply circuit 14 can be than 12V, reduce consuming electric power, can reduce standby power consumption in other words.
Also have, the cooking machine of present embodiment includes above-mentioned relay control device, because relay can use for a long time, therefore can provide a kind of service life very long cooking machine.In addition, cooking machine etc. all will heat, even as usual use, the environment temperature of relay control device is all than higher, and what can infer at an easy rate is that the electrolytic capacitor in the cooking machine can be easier to be more aging than the capacitor in the AV machine.But, output voltage by first DC power supply circuit 4 is set by control part 15, because this output voltage can switch, when setting capacitor volume, just there is no need to consider the faradic flushing time and the consumption electric power of relay, can only consider the electrolytic capacitor problem of deterioration all the year round.
(embodiment 2)
Fig. 4 is the part of module circuit diagram of the relay control device in the embodiments of the invention 2.Fig. 5 is equipped with the electric cooker sectional view of the cooking machine of present embodiment relay control device for conduct.In Fig. 5, for drawing has succinctly omitted the screw that the lead-in wire that is used to be electrically connected and fixed part are used.
As shown in Figure 4, the primary heater 41 that constitutes load is made of sheathed heater.In general, sheathed heater is installed heater such as nickel road alloy wire, is refilled electrical insulators and sealed and make in metal tube.Sheathed heater in the present embodiment is formed, is commonly referred to as the heater of " heater cast " by aluminum casting.This heater cast is when applying 100V voltage, and power is about 400W.Constitute the secondary heater 42 of load, also be made of sheathed heater, this sheathed heater is when applying 100V voltage, and power is about 70W.
First DC power supply circuit 45 is made of halfwave rectifier smoothing circuit 7 and Switching Power Supply 46.Halfwave rectifier smoothing circuit 7 is made of diode 5 and capacitor 6.Switching Power Supply 46 is accepted the electric power of halfwave rectifier smoothing circuit 7 and is supplied with and output 12V DC voltage.
Switching Power Supply 46 comprises: by MOSFET constant power semiconductor unit and to this power semiconductor carry out in the fixed current value range the built-in control circuit 9 of power semiconductor that the control circuit (not shown) of switch control constitutes, coil 10, smmothing capacitor 11 and for the voltage with capacitor 11 be made as fixed setting value the built-in control circuit 9 of power semiconductor is carried out the output voltage detecting circuit 47 of FEEDBACK CONTROL.
The open and close controlling that the built-in control circuit 9 of power semiconductor carries out in deciding current value range by built-in MOSFET, and charge through 10 pairs of capacitors 11 of coil.Though do not illustrate in the drawings, output voltage detecting circuit 47 is made of photoelectricity coupling circuit, about 12V Zener diode, about 7V Zener diode, about 4V Zener diode.By these three Zener diodes are switched, the output voltage of FEEDBACK CONTROL is switched.
Specifically, when output voltage is set at about 12V, photoelectricity coupling circuit and the series connection of 12V Zener diode, when the voltage of capacitor 11 surpasses 12V, the energising of 12V Zener diode, the conducting of photoelectricity coupling circuit, send the signal that output voltage surpasses 12V to the built-in control circuit 9 of power semiconductor, after the built-in control circuit 9 of power semiconductor was received signal, the switch of built-in MOSFET cut out, and the electric power of capacitor 11 is supplied with and stopped, voltage descends, when being lower than 12V, the 12V Zener diode is with no power, and the photoelectricity coupling circuit cuts out, send the signal that output voltage is lower than 12V to the built-in control circuit 9 of power semiconductor, after the built-in control circuit 9 of power semiconductor was received signal, the switch conduction of built-in MOSFET charged through 10 pairs of capacitors 11 of coil.
When output voltage was set at 7V, photoelectricity coupling circuit and the series connection of 7V Zener diode were carried out and top same action.When output voltage was set at 4V, same action was also carried out in photoelectricity coupling circuit and the series connection of 4V Zener diode.In addition, the output voltage detecting circuit 47 of present embodiment will describe afterwards.
In a word, present embodiment is the DC voltage that Switching Power Supply 46 is depressured to about 141V output voltage of halfwave rectifier smoothing circuit 7 about 12V of Switching Power Supply.
A terminal of first relay coil (relay) 48 is connected with the lead-out terminal of first DC power supply circuit 45.In the present embodiment, the rated voltage of first relay coil 48 is 12V.Also have, can produce faradic DC voltage (induced voltage) is 10V, and the DC voltage (maintenance voltage) that can produce the maintenance electric current is 5V.
A terminal of second relay coil (relay) 49 is connected with the lead-out terminal of first DC power supply circuit 45.In the present embodiment, the rated voltage of second relay coil 49 is 12V.Also have, can produce faradic DC voltage (induced voltage) is 11V, and the DC voltage (maintenance voltage) that can produce the maintenance electric current is 6V.
Output voltage setting device 54 is made of 2 transistors 55,56.By these 2 transistorized break-make combinations, the detection voltage setting value of output voltage detecting circuit 47 is switched.In the relay control device of present embodiment, when transistor 55,56 all ended, the detection voltage setting value of output voltage detecting circuit 47 was 12V; When having only transistor 55 conductings, the detection voltage setting value of output voltage detecting circuit 47 is 7V; When having only transistor 56 conductings, the detection voltage setting value of output voltage detecting circuit 47 is 4V.
No-voltage synchronizing signal generating unit 57 is used for the signal synchronous with the no-voltage of AC power 1 takes place, and comprising: the resistor voltage divider circuit 58 that is made of the series connection of two resistance, base stage input are connected with the collector terminal of transistor 59 with transistor 59, an end that carries out switch control and resistance 60 that the other end is connected with the lead-out terminal of second DC power supply circuit 14 from resistor voltage divider circuit 58 voltage after partial.After adopting above formation, no-voltage synchronizing signal generating unit 57 switches to low signal with high signal at the voltage of AC power 1 near no-voltage, perhaps low signal is switched to high signal.In the relay control device of present embodiment, 51 pairs of no-voltage synchronizing signals of micro computer generating unit 57 is detected by the situation that low signal switches to high signal, and the timer 61 that constitutes by the timing circuit that constitutes in the micro computer 51 picks up counting.
Timing setting portion 62 is used for setting the time period from no-voltage synchronizing signal generating unit 57 output signals to relay conducting or disconnection, and a plurality of time periods that will store in advance in the ROM of micro computer 51 take turns to switch.In the relay control device of present embodiment, will be divided into Ts1, Ts2, Ts3, Ts4 the period.In the present embodiment, according to supply frequency Ts1, Ts2, Ts3, Ts4 are set at the time period that phase difference is 90 degree again.That is, when the supply frequency of AC power 1 is 50HZ, Ts1=0ms, Ts2=5ms, Ts3=10ms, Ts4=15ms.Timing setting portion 62 takes turns to switch according to the variation of voltage-phase, changes from Ts1 to the Ts4 period.
In the relay control device of present embodiment, what timer portion 61 adopted is built-in timer in the micro computer 51 that is provided with separately in addition, and the time after switching on since first relay coil 48 or second relay coil 49 is carried out instrumentation.Through after the stipulated time, the signal to 18 outputs of output voltage setting device is switched.
As shown in Figure 5, electric cooker pot body 71 above be provided with can freely openable lid 72.The hinge axis 73 that electric cooker pot body 71 and lid 72 are made by stainless steel carries out mechanical connection.Hinge cap 72 opens and closes as rotating shaft with chain rivet 73.Be provided with pot resettlement section 74 in electric cooker pot body 71, the bottom of pot resettlement section 74 is provided with primary heater 41.Primary heater 41 is a cast aluminum heaters as shown in Figure 4.
Pot 75 metals by aluminium and so on form.The surface of pot 75 scribbles the fluorine layer.The upper end open portion of pot 75 is provided with outward extending flange.Pot 75 is housed in resettlement section 74 to carry with the top state of contact of primary heater 41 with the form that can freely put into/take out.The user puts into pot 75 with heating objects such as rice and water, cooks again.
Lid heating plate 76 is formed by the metal of stainless steel etc., is arranged in mode that can disassembled and assembled freely by rubber sheet gasket 77 and covers on 72.The position that roughly is in the center in the lid heating plate 76 is provided with the steam overfolw hole.On the face that faces of the lid heating plate 76 on the lid 72 aluminum heat liberation board 78 is housed.Secondary heater 42 usefulness aluminum foil and adhesive tape (not shown)s paste on the heat liberation board 78, are mounted to heat liberation board 78 to contact.Lid 72 central portion be equipped with can disassembled and assembled freely steam port 79, by the hole and the steam port 79 of lid heating plate 76, the steam that take place in the pot 75 are discharged.
Devices such as switch, LCD, micro computer 51 are installed on the first circuit board 80.Guidance panel 81 is embedded in electric cooker pot body 71, is printed on the literal of each switch meaning of expression on it.The user presses word segment, and the switch that is installed on the first circuit board 80 is pressed.
Though do not illustrate among Fig. 5, except first relay 43, also be equipped with second relay 44, first DC power supply circuit 45, second DC power supply circuit 14 etc. on the second circuit board 82.
Backrush formula power line resettlement section 83 is connected with second circuit board 82 by lead.Backrush formula power line resettlement section 83 makes power line can carry out backrush by block and spring.
Temperature detecting part 84 is made of temperature sensor, and the bottom that is arranged on pot 75 is the center slightly.Temperature sensor will be along with variation of temperature resistance also will change, and this temperature sensor constitutes bleeder circuit with the resistance of regulation resistance, and assigned voltage is added in the bleeder circuit two ends, and the resistance value of temperature sensor just can convert analog voltage to.Micro computer 51 shown in Figure 4 utilizes built-in AD switch to extrapolate temperature value from this analog voltage.
First circuit board 80 is connected by the lead (not shown) with second circuit board 82.The control of switching on of micro computer 51, first drive circuit 52 and 53 pairs first relay coils of second drive circuit 48, second relay coil 49, first relay tip 43, second relay tip 44 are connected, thereby make primary heater 41, secondary heater 42 conduction/heat releases, thereby pot 75 and lid heating plate 76 are heated.
The electric cooker of present embodiment heats pot 75 by the heating of heater 41, and the gratin in the pot 75 is carried out cooking.Rice and water or burned meal before the gratin here is meant and cooks.
Below with reference to Fig. 6 and Fig. 7 operation, the effect of electric cooker that the relay control device with above-mentioned formation is housed are described.Fig. 6 is the sequential chart (first half) of the operation waveform of the each several part of expression relay control device shown in Figure 4.Wherein, (a) on off state of expression first drive circuit 48, (b) current waveform of the expression primary heater 41 and first relay tip 43, (c) on off state of expression second drive circuit 49, (d) current waveform of the expression secondary heater 42 and second relay tip 44, (e) output voltage waveforms of expression first DC power supply circuit 45, (f) expression constitutes the on off state of the transistor 55 of output voltage setting device 54, (g) on off state of the transistor 56 of formation output setting device 54, (h) voltage waveform of expression AC power 1, (i) output signal of expression no-voltage synchronizing signal generating unit 57.The continuation of the sequential chart of Fig. 7 presentation graphs 6 (later half), (a)～(i) identical with Fig. 6.
At first, the user puts into Mi Heshui in pot 75 shown in Figure 5.At this moment, the relay control device of Fig. 4 keeps being connected with AC power 1 always.The micro computer 51 that constitutes control part 50 sends high signal to the transistor 55 that constitutes output voltage setting device 54, sends low signal to transistor 56.Constitute the transistor 55 of output voltage setting device 54, receive conducting behind the high signal, the 4V Zener diode that constitutes output voltage detecting circuit 47 is connected, and the detection voltage setting value is 4V, and so just can controlling first DC power supply circuit 45, to make its output voltage be 4V.
When the output voltage of first DC power supply circuit 45 was 4V, the output voltage of second DC power supply circuit 14 was about 3.3V.This is to be made of emitter base diode circuit because of second DC power supply circuit 14, and will fall the voltage of 0.7V between the transistorized base-emitter of formation emitter base diode circuit.And the action of the micro computer 51 in the present embodiment guarantees that scope is 2.3V～5.5V, even the output voltage of second DC power supply circuit 14 is about 3.3V, micro computer 51 also can move normally.
When the output voltage of first DC power supply circuit 45 is 4V, be that 7V compares during with 12V with output voltage, the voltage that control part 50 two ends apply is low, even current sinking is identical, the power consumption of control part 50 also can reduce.And first DC power supply circuit 45 is made of Switching Power Supply 46, and the conversion efficiency of DC voltage that is depressured to about 4V from the DC voltage of about 141V is also high a lot of than power transformer, thereby can reduce the power consumption of relay control device.
During above-mentioned state, press desirable switch according to the displaying contents of the guidance panel 81 of Fig. 5, by guidance panel 81, the switch on the first circuit board 80 is pressed, and the pairing program of cooking of switch has also begun.
For example, the switch of push panel 81, in the t0 moment of Fig. 6, the transistor 55 of the micro computer 51 in the control part 50 in output voltage setting device 54 sends low signal.
The time of output voltage from 4V to 12V will be by the supply capacity decision of the output current of first DC power supply circuit 45.In the present embodiment, output voltage is needed the time of about 25ms to 12V by 4V.
Constantly t1 be after closing from transistor 55 through the moment of 40ms, at moment t1, no-voltage synchronizing signal generating unit 57 is sent high signal to micro computer 51.The timer portion 61 of micro computer 51 inside picks up counting high edges of signals as triggering signal, till the time of setting in counting timing setting portion 62.As described in Figure 4, timing setting portion 62 can be set at 4 setting-up time Ts1, Ts2 that store in advance in the built-in ROM of micro computer 51, any setting-up time among Ts3, the Ts4.In the present embodiment, have first relay and second relay, timing setting portion 62 can set the setting-up time of each relay, and when beginning timing setting portion 62 of cooking all is set at Ts1 (0ms) to two relays.
At moment t1, because the setting-up time Ts1 that timing setting portion 62 sets is 0ms, after no-voltage synchronizing signal generating unit 57 was sent high signal, the micro computer 51 of control part 50 sent high signal to first drive circuit 52 at once.After first drive circuit 52 sends high signal, timing setting portion 62 will change to Ts3 (10ms) to the setting-up time that first drive circuit 52 sends high signal.Pick up counting with micro computer 51 built-in timers simultaneously.
During the transistor turns of first drive circuit 52,48 energisings of first relay coil.At this moment, the electric current of first relay coil 48 is supplied with by first DC power supply circuit 45.Because it is 12V that control first DC power supply circuit 45 makes its output voltage, even first relay coil 48 has electric current to flow through, voltage does not almost descend yet.
During 48 energisings of first relay coil, utilize the electromagnetic force of coil to drive first relay tip 43.But after 43 actions of first relay tip, contact is connected, and circuit is by opening, and the connection of relay tip 43, primary heater 41 conductings will spend the regular hour.In the present embodiment, in the big t2 moment behind 7ms, first relay tip 43 is connected, and the current path of primary heater 41 is in conducting state, and the pot 75 that primary heater 41 begins to generate heat to Fig. 5 heats.
At t3 constantly, t1 passes through about 90ms constantly.51 pairs of micro computers are measured with built-in timer during this period of time, when minute arrives 90ms, to the high signal of transistor 56 outputs that constitutes output voltage setting device 54.
When the output voltage of first DC power supply circuit 45 by 12V when 7V reduces, the built-in control circuit 9 of power semiconductor does not carry out on-off action.In a word, output voltage is determined by the capacity of the capacitor 11 that constitutes first DC power supply circuit 45 and the resistance of first relay coil 48 to the 7V required time by 12V.In the present embodiment, output voltage is about 15ms by 12V to the 7V required time.In the present embodiment, the DC voltage that can produce the maintenance electric current of first relay coil 48 is 5V, as long as the output voltage of first DC power supply circuit 45 is 7V, just can supply with the electric current that keeps electric current above.Simultaneously, giving the output voltage of second DC power supply circuit 14 is 7V, can suppress the loss of second DC power supply circuit 14 like this, has reduced the power consumption of the relay control device except load (primary heater 41) electric power.
At t4 constantly, for example, gratin moisture start vaporizer in the pot 75 of Fig. 5, a part of steam on the lid heating plate 76 begins dewfall.At this moment, for the secondary heater 42 that conducting is heated lid heating plate 76, micro computer 51 sends low signal to the transistor 56 of output voltage setting device 54.Transistor 56 is closed after receiving low signal, and the 12V Zener diode of output voltage detecting circuit 47 is connected, and detecting voltage setting value is 12V just, and so just can controlling first DC power supply circuit 45, to make its output voltage be 12V.
Output voltage becomes the time of 12V by the resistance of the supply capacity of the output current of first DC power supply circuit 45, first relay coil 48 with constitute capacitor 11 decisions of first DC power supply circuit 45 from 7V.In the present embodiment, output voltage is needed the time of about 15ms to 12V by 7V.
T5 closes the moment that begins through 40ms from transistor 55 constantly, and at moment t5, no-voltage synchronizing signal generating unit 57 is sent high signal to micro computer 51.As triggering, timing setting portion 62 carries out timing until the time of setting with high edges of signals in the timer portion 61 of micro computer 51 inside.As described in Figure 4, timing setting portion 62 can be set at 4 setting-up time Ts1, Ts2 that store in advance in the built-in ROM of micro computer 51, any setting-up time among Ts3, the Ts4.In the present embodiment, have first relay and second relay, timing setting portion 62 can set the setting-up time of each relay, and when beginning timing setting portion 62 of cooking all is set at Ts1 (0ms) to two relays.The second relay conducting is in the period of moment t5, and setting-up time is set as Ts1 (0ms).
At moment t5, because the setting-up time Ts1 that timing setting portion 62 sets is 0ms, behind the high signal of no-voltage synchronizing signal generating unit 57 outputs, micro computer 51 sends high signal to second drive circuit 53 at once.After second drive circuit 53 sends high signal, timing setting portion 62 will change to Ts3 (10ms) to the setting-up time of the high signal of transmission of second drive circuit 53.Pick up counting with micro computer 51 built-in timers simultaneously.
The transistor turns of second drive circuit 53,49 energisings of second relay coil.At this moment, the electric current of second relay coil 49 is supplied with by first DC power supply circuit 45.Because it is 12V that control first DC power supply circuit 45 makes its output voltage, even second relay coil 49 and first relay coil 48 have electric current to flow through, voltage does not almost descend yet.
Energising of second relay coil 49 and the electromagnetic force by coil drive second relay tip 44.In addition, after the action of second relay tip 44, contact is connected, and circuit is by opening, the connection of second relay tip 44, and secondary heater 42 is switched on and will spends the regular hour.In the present embodiment, big t6 behind 5～6ms constantly, second relay tip 44 is connected, the current path of secondary heater 42 is in conducting state, secondary heater 42 beginning heat releases, 78 pairs of lids of the lid heat liberation board heating plate 76 by Fig. 5 heats.
T7 passes through about 110ms constantly for t5 constantly.51 pairs of micro computers are measured with built-in timer during this period of time, when minute arrives 90ms, to the high signal of transistor 56 outputs that constitutes output voltage setting device 54.
When the output voltage of first DC power supply circuit 45 by 12V when 7V reduces, the built-in control circuit 9 of power semiconductor does not carry out on-off action.That is output voltage is determined by the capacity of the capacitor 11 that constitutes first DC power supply circuit 45 and the equivalent resistance of first relay coil 48 and second relay coil 49 to the 7V required time by 12V.In the present embodiment, output voltage is about 15ms by 12V to the 7V required time.
In the present embodiment, the DC voltage that can produce the maintenance electric current of first relay coil 48 and second relay coil 49 is 5V, as long as the output voltage of first DC power supply circuit 45 is 7V, just can supply with the electric current that keeps electric current above.Simultaneously, be 7V owing to give the output voltage of second DC power supply circuit 14, can suppress the loss of second DC power supply circuit 14 like this, reduced the consumption electric power of the relay control device except load (primary heater 41, secondary heater 42) electric power.
After after a while, primary heater 41 heatings are heated pot 75 bottom surfaces, and the temperature of bottom surface rises.The bottom surface temperature that the temperature detecting part 84 of Fig. 5 detects pot 75 uprises, and stops primary heater 41 heating by micro computer 51.
Then, at the moment of Fig. 7 t8, no-voltage synchronizing signal generating unit 57 is sent high signal, and micro computer 51 built-in timer portions 61 pick up counting.
At t9 constantly, the instrumentation time of timer portion 61, micro computer 51 was to first drive circuit, 52 output low signals when reaching setting-up time Ts3 (10ms), and the transistor of first drive circuit 52 is closed after receiving low signal, and 48 energisings of first relay coil stop.Because do not had electric current in first relay coil 48, the electromagnetic force of coil has not just had yet, the driving force of first relay tip 43 has not just had yet, and first relay tip 43 just is in open state.First relay tip 43 is in open state, and the current path of primary heater 41 will be disconnected, and primary heater 41 has not just had electric current yet, and the heating of primary heater 41 has also just stopped.
When the bottom surface temperature of pot 75 was low, after temperature detecting part 84 detected, primary heater 41 just was necessary to generate heat again pot 75 is heated.
At t10 constantly, for first relay coil 48 flows through electric current more than the induced-current, will controlling first DC power supply circuit 45, to make its output voltage be 12V.Micro computer 51 sends low signal to the transistor 56 of output voltage setting device 54, transistor 56 is closed after receiving low signal, the 12V Zener diode that constitutes output voltage detecting circuit is connected, detect voltage setting value and be set as 12V, so just can controlling first DC power supply circuit 45, to make its output voltage be 12V.
The time of output voltage from 7V to 12V will and constitute capacitor 11 decisions of first DC power supply circuit 45 by the resistance of the supply capacity of the output current of first DC power supply circuit 45, second relay coil 49.In the present embodiment, output voltage is needed the time of about 15ms to 12V by 7V.
T11 is that transistor 56 is from closing the moment that begins through 40ms constantly.At moment t11, no-voltage synchronizing signal generating unit 57 is sent high signal to micro computer 51, and the timer portion 61 of micro computer 51 inside as triggering, picks up counting high edges of signals.
At moment t12, when the instrumentation time of timer portion 61 reached timing setting portion 62 and sets time T s3 (10ms), micro computer 51 sent high signal to first drive circuit 52.After first drive circuit 52 sends high signal, timing setting portion 62 will change to Ts2 (5ms) to the setting-up time of the high signal of transmission of first drive circuit 52.Pick up counting with micro computer 51 built-in timers simultaneously.
The transistor turns of first drive circuit 52,48 energisings of first relay coil.At this moment, the electric current of first relay coil 48 is supplied with by first DC power supply circuit 45.Because it is 12V that control first DC power supply circuit 45 makes its output voltage, even first relay coil 48 and second relay coil 49 have electric current to flow through, voltage does not almost descend yet.
T14 passes through 90ms constantly for t12 constantly.51 pairs of micro computers carry out timing with built-in timer during this period of time, when minute arrives 90ms, to the high signal of transistor 56 outputs that constitutes output voltage setting device 54.
When the output voltage of first DC power supply circuit 45 by 12V when 7V reduces, the built-in control circuit 9 of power semiconductor does not carry out on-off action.That is output voltage is determined by the capacity of the capacitor 11 that constitutes first DC power supply circuit 45 and the resistance of first relay coil 48 and second relay 49 to the 7V required time by 12V.In the present embodiment, output voltage is about 15ms by 12V to the 7V required time.Because can flow through the DC voltage of the maintenance electric current of first relay coil 48 and second relay 49 is 5V,, just can supply with the electric current that keeps electric current above as long as the output voltage of first DC power supply circuit 45 is 7V.Simultaneously, be 7V owing to give the output voltage of second DC power supply circuit 14, can suppress the loss of second DC power supply circuit 14 like this, reduced the consumption electric power of the relay control device except load (primary heater 41) electric power.
Then, when covering the increase in temperature of heating plate 76, micro computer 51 will send to secondary heater 42 and stop heating signal.
At t15 constantly, t8 constantly sends high signal to no-voltage synchronizing signal generating unit 57, and micro computer 51 built-in timing portions 61 pick up counting.
At t16 constantly, the instrumentation time of timer portion 61, micro computer 51 was to second drive circuit, 53 output low signals when reaching setting-up time Ts3 (10ms), and the transistor of second drive circuit 53 is closed after receiving low signal, and 49 energisings of second relay coil stop.Do not had electric current in second relay coil 49, the electromagnetic force of coil has not just had yet, and the driving force of second relay tip 44 has not just had yet, and second relay tip 44 just is in open state.After second relay tip 44 was in open state, the current path of secondary heater 42 will be disconnected, and secondary heater 42 has not just had electric current yet, and the heating of secondary heater 42 has also just stopped.
According to upper type, the relay control device of present embodiment is meant, even a plurality of relays are arranged, as long as control the output voltage of first DC power supply circuit 45 of supplying with first relay coil 48 and second relay coil, 49 electric currents by control part 50, can switch like that according to the moment of hope with the maintenance electric current that can supply with relay coil because supply with the induced-current of relay coil, so the current sinking of relay coil and just can be inhibited the loss that control part 50 carries out second DC power supply circuit 14 that electric power supplies with.Also have, in order to reduce the current sinking of relay coil, relay coil and current limitation resistance are connected in series, and this just there is no need.And, when current limitation resistance is connected in series, the electric current when starting in order to ensure relay coil, and also there is no need with capacitor that relay coil has carried out being connected in parallel.
Also have, control part 50 is that the output of the period set according to timing setting portion 62 and timer portion 61 comes the conducting of control relay and disconnection, timing setting portion 62 changes the period according to the positive and negative of AC power phase place, like this, the current average that flows into relay tip approaches zero, suppress the transfer of relay tip metal, improved the durability of relay tip.
Also have, when all cut-offs, the output voltage that relay is carried out first DC power supply circuit of electric current supply will be lower than keeping voltage, even because the influence of foeign element has been exported Continuity signal to relay, can be owing to relay coil does not have sufficient electromagnetic force yet, relay tip cannot connect.
Also have, in the relay control device in the present embodiment, the induced-current of first relay coil 48 and second relay coil 49 is identical with maintenance voltage, also is fine with the different relay of maintenance electric current with induced-current.In this case, can set output voltage according to the big relay of induced-current in case of necessity, keep electric current can set output voltage according to the big relay of maintenance electric current in case of necessity at induced-current.Like this, when driving relay, the setting value of the output voltage of first DC power supply circuit 45 can have 2, and the combination of relay and induced-current or maintenance electric current just can drive accurately.
Also have, the relay control device of present embodiment does not show that in the drawings the voltage detection department and the output voltage detecting circuit 47 that detect first DC power supply circuit 45 are provided with respectively, also can be according to the detection voltage of this voltage detection department, the relay conducting is under an embargo or is disengaged.As long as voltage detection department detects the output voltage of first DC power supply circuit 45, when first DC power supply circuit 45 shown in Fig. 3,6,7 has output voltage, whether the output voltage that just can judge first DC power supply circuit 45 is the above voltage of induced-current that can supply with relay coil, can drive relay in the shortest time.Voltage detection department is made of resistor voltage divider circuit, as long as the built-in A/D converter of input micro computer, micro computer just can judge whether the setting voltage of first DC power supply circuit 45 has output, and the fault of first DC power supply circuit 45 also just can be discovered in an early phase.
Also have, utilize temperature detecting part shown in Figure 5 84, just can infer the temperature of the second circuit board 82 that relay is housed, the resistance value of relay coil also just can be inferred, and just can adjust the output voltage of first DC power supply circuit 45 by control part 50.Because the temperature difference can cause resistance variations, if the certain words of supply electric current of guard relay coil, the output voltage of first DC power supply circuit 45 just is necessary to adjust, utilize temperature detecting part can supply with necessary minimum current, power consumption when like this, relay coil is switched on also just can minimize.
Also have,, include above-mentioned relay control device,, provide a kind of product life very long cooking machine because relay can use for a long time as the electric cooker of present embodiment cooking machine.
In addition, in the present embodiment, be that load describes with the heater, family's roast machine of toast bread for example, in addition, the motor that raw material are stirred also can be used as load, and this motor is controlled also with the switching of relay and is fine.
According to upper type, about relay control device of the present invention, relay coil being carried out the output voltage of the power circuit (first DC power supply circuit) of electric current supply can be set by control part, control part carries out the output voltage of first DC power supply circuit of electric current supply according to the ON time of relay to relay coil, switches to the voltage that can supply with more than the maintenance voltage that keeps electric current from the voltage that can supply with more than the faradic induced voltage.Like this, can not be subjected to the first dc source formation portion product influence of deterioration all the year round, miniaturization that can assurance portion product and long-term the use.In addition, cooking machine of the present invention can use for a long time owing to relay, therefore can provide a kind of life of product very long cooking machine, for be that load and the relay control device of controlling with relay and the cooking machine that includes relay control device also all are of great use with heater etc.
Claims (10)
1. relay control device is characterized in that comprising:
AC power;
Load;
Make the current path conducting of above-mentioned load and above-mentioned AC power or the relay of disconnection;
Above-mentioned AC power is converted to first DC power supply circuit of dc source;
The output voltage of above-mentioned first DC power supply circuit is converted to second DC power supply circuit lower than the voltage of first DC power supply circuit; With
Carry out electric power by second DC power supply circuit and supply with the also conducting of control relay and the control part of disconnection,
Above-mentioned first DC power supply circuit has a plurality of output voltages, the driving electric power of above-mentioned relay is supplied with by first DC power supply circuit according to the control signal of control part, above-mentioned control part is set at the magnitude of voltage that can produce more than the faradic induced voltage of relay with the output voltage of first DC power supply circuit when above-mentioned relay conducting, begin after the stipulated time from the relay conducting, the output voltage of first DC power supply circuit is set at the magnitude of voltage that can produce more than the maintenance voltage that relay keeps electric current.
2. relay control device as claimed in claim 1, it is characterized in that: when control part disconnects at relay, the output voltage of first DC power supply circuit is set at than supplying with the lower voltage of faradic induced voltage, and before the relay conducting, the output voltage of the first above-mentioned DC power supply circuit is set at magnitude of voltage more than the induced voltage.
3. relay control device as claimed in claim 2 is characterized in that: when control part disconnects at relay, the output voltage of first DC power supply circuit is set at the lower voltage of maintenance voltage that keeps electric current than supplying with.
4. relay control device as claimed in claim 1, it is characterized in that: also comprise the voltage detection department that detects the first DC power supply circuit voltage, control part is when the relay conducting, the detected voltage of above-mentioned voltage detection department is when the induced voltage of above-mentioned relay is following, and control relay does not begin conducting.
5. relay control device as claimed in claim 1 is characterized in that also comprising:
Be used for taking place the no-voltage synchronizing signal generating unit of the no-voltage synchronizing signal of AC power;
Be used for measuring the timer of above-mentioned no-voltage synchronizing signal generating unit output time; With
Be used for the timing setting portion that sets to the period of relay conducting or disconnection from no-voltage synchronizing signal generating unit output signal,
Conducting and disconnection that the output of period that control part is set according to above-mentioned timing setting portion and above-mentioned timing portion comes control relay, above-mentioned timing setting portion also rotates change with the above-mentioned period according to the phase place of AC power positive and negative.
6. relay control device as claimed in claim 1 is characterized in that also comprising: a plurality of loads and a plurality of relays that the current path of above-mentioned a plurality of loads and AC power is carried out conducting or disconnection respectively,
Control part is in above-mentioned a plurality of relays during a conducting, no matter other relay is in conducting state or off-state, the output voltage of first DC power supply circuit will be set at can supply with the above magnitude of voltage of the faradic induced voltage of above-mentioned relay, then, after stipulated time, the output voltage of first DC power supply circuit will be set at can supply with the above magnitude of voltage of maintenance voltage that above-mentioned relay keeps electric current.
7. relay control device as claimed in claim 6 is characterized in that the plural relay that comprises that also induced-current is different,
Control part in the middle of the above-mentioned different induced-currents, can be supplied with the output voltage that maximum faradic induced voltage is set as first DC power supply circuit when the relay conducting.
8. relay control device as claimed in claim 7 is characterized in that also comprising the different plural relay of maintenance electric current,
Control part is when the relay conducting, in the middle of the above-mentioned different induced-current, can supply with the output voltage that maximum faradic induced voltage is set as first DC power supply circuit, after relay is conducting to the stipulated time, above-mentioned different the maintenance in the middle of the electric current,, the maintenance voltage that can supply with maximum maintenance electric current is set as the output voltage of first DC power supply circuit.
9. relay control device as claimed in claim 1 is characterized in that: comprise the temperature detecting part that detects near the temperature of relay, control part will change the output voltage of first DC power supply circuit according to the output of said temperature test section.
10. a cooking machine is characterized in that: comprise the relay control device described in each in the claim 1～9.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008-139194 | 2008-05-28 | ||
| JP2008139194A JP5195029B2 (en) | 2008-05-28 | 2008-05-28 | Relay control device and cooking equipment |
| JP2008139194 | 2008-05-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101596074A true CN101596074A (en) | 2009-12-09 |
| CN101596074B CN101596074B (en) | 2013-09-25 |
Family
ID=41417809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910142980 Expired - Fee Related CN101596074B (en) | 2008-05-28 | 2009-05-19 | Relay control device and cooking machine |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP5195029B2 (en) |
| CN (1) | CN101596074B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105193244A (en) * | 2014-05-29 | 2015-12-30 | 佛山市顺德区美的电热电器制造有限公司 | Pressure cooking utensil |
| CN107661031A (en) * | 2016-07-28 | 2018-02-06 | 姜炫豪 | Air circulating type electric bakeware |
| CN109698097A (en) * | 2018-12-29 | 2019-04-30 | 宁波市鄞州顺和自动化设备有限公司 | A kind of relay air hole hot-melting sealed automatic machine |
| CN111641256A (en) * | 2019-03-01 | 2020-09-08 | 弗莱克斯有限公司 | Automatic AC Feed Control (AFC) with zero voltage/current switching |
| CN111736497A (en) * | 2019-03-25 | 2020-10-02 | 阿自倍尔株式会社 | Control device |
| CN112582208A (en) * | 2019-09-30 | 2021-03-30 | 罗克韦尔自动化技术公司 | Relay coil drive circuit |
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| CN101763984B (en) * | 2009-12-30 | 2012-10-03 | 九阳股份有限公司 | Circuit and method for controlling relay in soymilk machine circuit |
| JP5618181B2 (en) * | 2010-03-31 | 2014-11-05 | スズキ株式会社 | Relay drive circuit |
| CN103393349B (en) * | 2013-08-22 | 2015-12-09 | 蒋任恩 | A kind of remote control device for cooking |
| JP6803603B2 (en) * | 2016-06-03 | 2020-12-23 | 株式会社川島製作所 | Bag making filling and packaging machine |
| CN108987185A (en) * | 2018-07-23 | 2018-12-11 | 深圳市智维兴科技有限公司 | A kind of multi-channel DC relay conducting control technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0728661Y2 (en) * | 1988-04-18 | 1995-06-28 | 東芝ホームテクノ株式会社 | Relay drive circuit |
| DE4026427C1 (en) * | 1990-08-21 | 1992-02-13 | Siemens Ag, 8000 Muenchen, De | |
| JP3237447B2 (en) * | 1995-03-31 | 2001-12-10 | 松下電器産業株式会社 | Iron |
| KR20040043021A (en) * | 2002-11-15 | 2004-05-22 | 삼성전자주식회사 | Microwave oven having a toaster |
-
2008
- 2008-05-28 JP JP2008139194A patent/JP5195029B2/en not_active Expired - Fee Related
-
2009
- 2009-05-19 CN CN 200910142980 patent/CN101596074B/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105193244A (en) * | 2014-05-29 | 2015-12-30 | 佛山市顺德区美的电热电器制造有限公司 | Pressure cooking utensil |
| CN105193244B (en) * | 2014-05-29 | 2017-10-27 | 佛山市顺德区美的电热电器制造有限公司 | Pressure cooking appliance |
| CN107661031A (en) * | 2016-07-28 | 2018-02-06 | 姜炫豪 | Air circulating type electric bakeware |
| CN107661031B (en) * | 2016-07-28 | 2019-10-11 | 姜炫豪 | Air circulating type electric bakeware |
| CN109698097A (en) * | 2018-12-29 | 2019-04-30 | 宁波市鄞州顺和自动化设备有限公司 | A kind of relay air hole hot-melting sealed automatic machine |
| CN111641256A (en) * | 2019-03-01 | 2020-09-08 | 弗莱克斯有限公司 | Automatic AC Feed Control (AFC) with zero voltage/current switching |
| CN111736497A (en) * | 2019-03-25 | 2020-10-02 | 阿自倍尔株式会社 | Control device |
| CN112582208A (en) * | 2019-09-30 | 2021-03-30 | 罗克韦尔自动化技术公司 | Relay coil drive circuit |
| CN112582208B (en) * | 2019-09-30 | 2024-05-17 | 罗克韦尔自动化技术公司 | Relay coil driving circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5195029B2 (en) | 2013-05-08 |
| CN101596074B (en) | 2013-09-25 |
| JP2009289521A (en) | 2009-12-10 |
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