CN208014612U - Drive circuit of relay and cooking utensil - Google Patents

Abstract

The utility model discloses a drive circuit and cooking utensil of relay. Wherein, this drive circuit has the control end, and this drive circuit includes: the first switch circuit is provided with a first end, a second end and a third end, and the first end of the first switch circuit is connected with the first control end of the relay; the first unidirectional circuit is provided with an input end and an output end, the output end of the first unidirectional circuit is connected with the second end of the first switch circuit, and the input end of the first unidirectional circuit is connected with the control end of the drive circuit; and the second switch circuit is provided with a first end, a second end and a third end, the first end of the second switch circuit is grounded with the third end of the first switch circuit, the second end of the second switch circuit is connected with the input end of the first unidirectional circuit and the control end of the drive circuit, and the third end of the second switch circuit is grounded. The utility model provides a prior art relay's drive circuit under the condition that any device damaged or the short circuit, lead to the relatively poor technical problem of drive circuit reliability.

Description

The driving circuit and cooking apparatus of relay

Technical field

The utility model is related to household appliance technical fields, in particular to the driving circuit and cooking pot of a kind of relay Tool.

Background technology

The cooking apparatus that existing cooking apparatus, such as electric pressure cooking saucepan etc. are heated using heat-generating disc, generally use after Electrical equipment control heat-generating disc is heated.During using relay control heating, the driving circuit of relay passes through one Triode drives, as shown in Figure 1, when drive signal HEAT exports high level, triode Q1 conductings, driving relay RLY1 is closed It closes, control heat-generating disc R0 is begun to warm up；When HEAT exports low level, Q1 is turned off, and driving RLY1 is disconnected, and control R0 stops adding Heat.

But when triode damages, the collector (poles C) and emitter (poles E) of triode are short-circuit, regardless of whether there is driving Signal, relay are closed always, and heat-generating disc heats always, are led to the reduction of driving circuit reliability, are finally damaged cooking apparatus Seriously, it or causes danger.

For prior art repeat circuit driving circuit in the case of any one device failure or short circuit, cause to drive The poor problem of dynamic circuit reliability, currently no effective solution has been proposed.

Utility model content

The utility model embodiment provides a kind of driving circuit and cooking apparatus of relay, at least to solve existing skill The driving circuit of art repeat circuit causes driving circuit reliability poor in the case of any one device failure or short circuit Technical problem.

According to the one side of the utility model embodiment, a kind of driving circuit of relay, driving circuit tool are provided There are the control terminal, driving circuit to include：First switch circuit, has first end, second end and a third end, and the of first switch circuit First control terminal of one end and relay connects, wherein and the second control terminal of relay is connect with DC power supply, and the of relay One power end is connect with AC power, and the second source end of relay is connect by loading with AC power；First one-way circuit, With input terminal and output end, the output end of the first one-way circuit is connect with the second end of first switch circuit, the first unidirectional electricity The input terminal on road and the control terminal of driving circuit connect；Second switch circuit, have first end, second end and third end, second The first end of switching circuit is grounded with the third end of first switch circuit, the second end of second switch circuit and the first one-way circuit Input terminal connected with the control terminal of driving circuit, the third end of second switch circuit ground connection.

In the utility model embodiment, by the way that the first one-way circuit and second switch circuit are arranged in the driving circuit, Pass through second switch circuit so that when the third end of first switch circuit and first end are connected, second switch circuit can be passed through Driving relay is opened or closed, and relay is avoided to be closed always；Pass through the one-way conduction characteristic of the first one-way circuit so that the When the second end and the first terminal shortcircuit of one switching circuit, the second end level of second switch circuit will not be raised, and avoid second Switching circuit is connected, and relay is closed always, to realize no matter any one device failure or short circuit, in no drive signal feelings Under condition, all loaded work piece will not be controlled by relay, reach the technique effect for promoting driving circuit reliability, and then solve The driving circuit of prior art repeat circuit leads to driving circuit reliability in the case of any one device failure or short circuit Poor technical problem.

Further, driving circuit further includes：First capacitance, has a first end and a second end, the first end of the first capacitance It is connect with the second end of the input terminal of the first one-way circuit and second switch circuit, the second end of the first capacitance and driving circuit Control terminal connects.Pass through the effect of the logical exchange stopping direct current of the first capacitance so that when drive signal is with DC power supply short circuit, avoid First switch circuit and second switch circuit turn-on, relay are closed always, are further reached and are promoted driving circuit reliability Effect.

Further, when the control terminal of driving circuit exports AC signal, first switch circuit and second switch circuit Conducting, to drive relay to be closed, control load is started to work；When the control terminal of driving circuit exports direct current signal, first Switching circuit and the shutdown of second switch circuit, to drive relay to disconnect, control load is stopped.Due to being provided with the first electricity Hold, controller can export AC signal by control terminal, control loaded work piece；By exporting direct current signal, control load stops Only work, to realize no matter any one device failure or short circuit, it is negative that control can be exported by the control terminal of driving circuit It carries work or is stopped, further achieve the effect that promote driving circuit reliability.

Further, direct current signal is low level signal.Controller exports low level signal control load by control terminal It is stopped, to reach drive circuit power consumption, avoids, to the hurtful effect of other devices, further reaching promotion driving The effect of circuit reliability.

Further, driving circuit further includes：Second one-way circuit has input terminal and output end, the second one-way circuit Output end connect with the second end of the input terminal of the first one-way circuit and second switch circuit, the input terminal of the second one-way circuit It is connect with the first end of the first capacitance.By the way that the second one-way circuit is arranged in the driving circuit, it is ensured that drive signal can only be from drive The control terminal of dynamic circuit flows to the second end of first switch circuit and second switch circuit, and further reaching promotion driving circuit can By the effect of property.

Further, driving circuit further includes：Third one-way circuit has input terminal and output end, third one-way circuit Output end connect with the first end of the input terminal of the second one-way circuit and the first capacitance, the input of third one-way circuit termination Ground.By the way that third one-way circuit is arranged in the driving circuit, pass through the clamping action of third one-way circuit, it is ensured that GND level is different Chang Shi protects device in driving circuit to be punctured or burnt out by induced voltage, further reaches the effect for promoting driving circuit reliability Fruit.

Further, driving circuit further includes：Second capacitance, has a first end and a second end, the first end of the second capacitance It is connect with the second end of the control terminal of driving circuit and the first capacitance, the second end ground connection of the second capacitance.By in driving circuit The second capacitance of middle setting realizes the drive signal filtering clutter exported to controller, and it is reliable further to reach promotion driving circuit The effect of property.

Further, driving circuit further includes：Third capacitance, has a first end and a second end, the first end of third capacitance It is connect with the second end of the input terminal of the first one-way circuit, the output end of the second one-way circuit and second switch circuit, third electricity The second end of appearance is grounded.By being arranged third capacitance in the driving circuit, energy storage is realized, and when drive signal current is smaller, Drive signal is amplified, further achievees the effect that promote driving circuit reliability.

Further, driving circuit further includes：First resistor has a first end and a second end, the first end of first resistor It is connect with the second end of the first capacitance, the second end of first resistor and the control terminal of driving circuit and the first end of the second capacitance connect It connects；Second resistance has a first end and a second end, and the first end of second resistance is connect with the input terminal of the first one-way circuit, the The second end of two resistance is connect with the output end of the first end of third capacitance and the second one-way circuit；3rd resistor has first End and second end, the first end of 3rd resistor are connect with the second end of second switch circuit, the second end of 3rd resistor and second The second end of resistance, the first end of third capacitance are connected with the output end of the second one-way circuit；4th resistance, have first end and Second end, the first end of the 4th resistance and the second end of second resistance, the second end of 3rd resistor, the first end of third capacitance and The output end of second one-way circuit connects, the second end ground connection of the 4th resistance.By the way that first resistor, are arranged in the driving circuit Two resistance, 3rd resistor and the 4th resistance avoid the super-high-current that device is flowed into from puncturing or burn out, further reach promotion and drive The effect of dynamic circuit reliability.

Further, driving circuit further includes：4th one-way circuit has input terminal and output end, the 4th one-way circuit Input terminal and relay the first control terminal and first switch circuit first end connect, the output end of the 4th one-way circuit with Second control terminal of relay is connected with DC power supply.By the 4th one-way circuit of both ends reverse parallel connection in relay, avoid Device is punctured or is burnt out by induced voltage in driving circuit, further achievees the effect that promote driving circuit reliability.

Further, first switch circuit includes：First triode, collector and the first switch circuit of the first triode First end connection, the base stage of the first triode connect with the second end of first switch circuit, the emitter of the first triode and The third end of first switch circuit connects；Second switch circuit includes：Second triode, the collector of the second triode and second The first end of switching circuit connects, and the base stage of the second triode is connect with the second end of second switch circuit, the second triode Emitter is connect with the third end of second switch circuit；First one-way circuit includes：First diode, the cathode of the first diode It is connect with the output end of the first one-way circuit, the anode of the first diode is connect with the input terminal of the first one-way circuit；Second is single Include to circuit：Second diode, the cathode of the second diode are connect with the output end of the second one-way circuit, the second diode Anode is connect with the input terminal of the second one-way circuit；Third one-way circuit includes：Third diode, the cathode of third diode with The output end of third one-way circuit connects, and the anode of third diode is connect with the input terminal of third one-way circuit；4th is unidirectional Circuit includes：The cathode of 4th diode, the 4th diode is connect with the output end of the 4th one-way circuit, and the 4th diode is born Pole is connect with the input terminal of the 4th one-way circuit.

Further, it loads as heat-generating disc.

According to the another aspect of the utility model embodiment, a kind of cooking apparatus is additionally provided, including：Above-mentioned relay Driving circuit.

Further, cooking apparatus is electric pressure cooking saucepan.

Description of the drawings

Attached drawing described herein is used to provide a further understanding of the present invention, and is constituted part of this application, The exemplary embodiment of the utility model and the description thereof are used to explain the utility model, does not constitute to the improper of the utility model It limits.In the accompanying drawings：

Fig. 1 is a kind of schematic diagram of the driving circuit of relay according to prior art；

Fig. 2 is the schematic diagram according to a kind of driving circuit of relay of the utility model embodiment；

Fig. 3 is the schematic diagram according to the driving circuit of another relay of the utility model embodiment；

Fig. 4 is the schematic diagram according to a kind of driving circuit of optional relay of the utility model embodiment.

Wherein, above-mentioned attached drawing includes following reference numeral：

10, control terminal；20, first switch circuit；30, the first one-way circuit；40, second switch circuit；50, relay； 60, it loads；70, the first capacitance；80, the second one-way circuit；90, third one-way circuit；100, the second capacitance；110, third electricity Hold；120, first resistor；130, second resistance；140,3rd resistor；150, the 4th resistance；160, the 4th one-way circuit.

Specific implementation mode

In order to make those skilled in the art more fully understand the utility model, below in conjunction with the utility model reality The attached drawing in example is applied, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that described Embodiment is only the embodiment of the utility model part, instead of all the embodiments.Based on the reality in the utility model Example is applied, every other embodiment obtained by those of ordinary skill in the art without making creative efforts is all answered When the range for belonging to the utility model protection.

It should be noted that term " first " in the specification and claims of the utility model and above-mentioned attached drawing, " second " etc. is for distinguishing similar object, without being used to describe specific sequence or precedence.It should be appreciated that in this way The data used can be interchanged in the appropriate case, so that the embodiments of the present invention described herein can be in addition at this In illustrate or description those of other than sequence implement.In addition, term " comprising " and " having " and their any deformation, meaning It includes to be not necessarily limited to clearly arrange for example, containing a series of system of units, product or equipment that figure, which is to cover non-exclusive, Those of go out unit, but may include not listing clearly or for the intrinsic other units of these products or equipment.

According to the utility model embodiment, a kind of embodiment of the driving circuit of relay is provided.

Fig. 2 is according to a kind of schematic diagram of the driving circuit of relay of the utility model embodiment, as shown in Fig. 2, driving Circuit is moved with control terminal 10, which includes：First switch circuit 20, the first one-way circuit 30 and second switch circuit 40。

Wherein, first switch circuit 20 have first end, second end and third end, the first end of first switch circuit 20 with First control terminal of relay 50 connects, wherein and the second control terminal of relay 50 is connect with DC power supply, and the of relay 50 One power end is connect with AC power, and the second source end of relay 50 is connect by load 60 with AC power；First is unidirectional There is circuit 30 input terminal and output end, the output end of the first one-way circuit 30 to be connect with the second end of first switch circuit 20, The input terminal of first one-way circuit 30 and the control terminal 10 of driving circuit connect；Second switch circuit 40 has first end, second End and third end, the first end of second switch circuit 40 are grounded with the third end of first switch circuit 20, second switch circuit 40 Second end connect with the control terminal 10 of the input terminal of the first one-way circuit 30 and driving circuit, the third of second switch circuit 40 End ground connection.

Specifically, above-mentioned control terminal 10 can be that control port corresponding with the main control chip of cooking apparatus connects The ends HEAT, by inputting corresponding drive signal, driving relay 50 conducting of control driving circuit or shutdown；Above-mentioned direct current Power supply can be VDD；Above-mentioned AC power includes：Firewire L and zero curve N, two power ends of relay 50 can respectively with L Line is connected with N lines, for example, the first power end of relay 50 can directly be connect with L lines, the second source end of relay 50 can To be connect with N lines by load 60；In cooking apparatus, above-mentioned load 60 can be heating device, motor etc., this practicality is new Type is not construed as limiting this, needs the load controlled by relay 50 60 that above-mentioned purpose may be implemented.

Optionally, load 60 is heat-generating disc.

Specifically, in electric pressure cooking saucepan, above-mentioned load 60 can be heating device, for example, heat-generating disc.

Optionally, first switch circuit 20 includes：First triode, collector and the first switch circuit of the first triode 20 first end connection, the base stage of the first triode are connect with the second end of first switch circuit 20, the transmitting of the first triode Pole is connect with the third end of first switch circuit 20；Second switch circuit 40 includes：Second triode, the current collection of the second triode Pole is connect with the first end of second switch circuit 40, and the base stage of the second triode is connect with the second end of second switch circuit 40, The emitter of second triode is connect with the third end of second switch circuit 40；First one-way circuit 30 includes：First diode, The cathode of first diode is connect with the output end of the first one-way circuit 30, anode and the first one-way circuit 30 of the first diode Input terminal connection.

Specifically, the first above-mentioned triode and the second triode can be NPN type triodes.

In a kind of optional scheme, the first triode is provided only in existing driving circuit, in order to avoid the one or three Short circuit, which occurs, in the collector and emitter of pole pipe leads to that relay 50 is driven to be connected always, can increase by second in the driving circuit There is the normal work that short circuit has no effect on the second triode in the collector and emitter of triode, the first triode, to work as When short circuit occurs in the collector and emitter of first triode, the conducting of relay 50 can be driven by the second triode or is closed It is disconnected, avoid relay 50 from being constantly in conducting state.In addition, due to when the collector of the first triode and base stage short circuit, this When the first triode base stage be high level, further the base stage of the second triode be high level, cause the first triode and Second triode is both turned on, to solve the above-mentioned problems, can be to increase by first at the base stage of the first triode in the driving circuit Diode, using the one-way conduction of diode, to avoid when the collector of the first triode and base stage short circuit, the two or three The base level of pole pipe is raised, and leads to the second triode ON.

In the utility model above-described embodiment, by the way that the first one-way circuit 30 and second switch are arranged in the driving circuit Circuit 40 passes through second switch circuit 40 so that, can be by the when the third end of first switch circuit 20 and first end are connected Two switching circuits 40 driving relay 50 is opened or closed, and relay 50 is avoided to be closed always；Pass through the first one-way circuit 30 One-way conduction characteristic so that when the second end and the first terminal shortcircuit of first switch circuit 20, the second end of second switch circuit 40 Level will not be raised, and second switch circuit 40 is avoided to be connected, and relay 50 is closed always, to realize no matter any one device Part damages or short circuit, in no drive signal, 60 work of load will not be all controlled by relay 50, reaches promotion driving The technique effect of circuit reliability, so solve the driving circuit of prior art repeat circuit in any one device failure or In the case of short circuit, lead to the poor technical problem of driving circuit reliability.

Optionally, as shown in figure 3, driving circuit further includes：First capacitance 70.

Wherein, the first capacitance 70 has a first end and a second end, the first end of the first capacitance 70 and the first one-way circuit 30 Input terminal connected with the second end of second switch circuit 40, the control terminal 10 of the second end of the first capacitance 70 and driving circuit connects It connects.

Specifically, in process of production due to driving circuit, the ends HEAT are possible to short circuit occur with VDD, lead to the ends HEAT The drive signal of input is high level always, and driving relay 50 is constantly in conducting state, to solve the above-mentioned problems, can be with Increase by the first capacitance 70 in the driving circuit, pass through the effect of the logical exchange stopping direct current of the first capacitance 70 so that drive signal with When DC power supply short circuit, first switch circuit 20 and second switch circuit 40 is avoided to be connected, relay 50 is closed always, further Achieve the effect that promote driving circuit reliability.

Optionally, when the control terminal of driving circuit 10 exports AC signal, first switch circuit 20 and second switch electricity Road 40 is connected, and to drive relay 50 to be closed, control load 60 is started to work；When the control terminal 10 of driving circuit exports direct current letter Number when, first switch circuit 20 and second switch circuit 40 turn off, and to drive relay 50 to disconnect, control load 60 stops works Make.

Optionally, direct current signal is low level signal.

Specifically, above-mentioned AC signal can be pulse wave signal；Above-mentioned direct current signal can be high level signal Or low level signal, since low level signal power consumption is small, and it is harmless to other devices, with low in the utility model embodiment It is described in detail for level signal.

In a kind of optional scheme, due to the effect of the logical exchange stopping direct current of the first capacitance 70, loaded when needing to control When 60 work, main control chip can be by the ends HEAT input exchange signal, so as to control the one or three by the first capacitance 70 Pole pipe and the second triode ON or shutdown so that load 60 is started to work, can be with by controlling the duty ratio of AC signal The running parameter of control load 60, for example, the heating power of control heat-generating disc, controls the rotational frequency etc. of motor；When not needing It, can be by the ends HEAT input direct-current signal, to which the first capacitance 70, the first triode can not be passed through when control 60 work of load Be turned off with the second triode, load 60 is stopped, to realize no matter any one device failure or short circuit, can pass through 60 work of the output control of control terminal 10 load of driving circuit is stopped, and further reaches and promotes driving circuit reliability Effect.

Optionally, as shown in figure 3, driving circuit further includes：Second one-way circuit 80.

Wherein, the second one-way circuit 80 has input terminal and output end, the output end of the second one-way circuit 80 and the first list It is connected to the input terminal of circuit 30 with the second end of second switch circuit 40, the input terminal and the first capacitance of the second one-way circuit 80 70 first end connection.

Optionally, the second one-way circuit 80 includes：Second diode, the cathode of the second diode and the second one-way circuit 80 Output end connection, the second diode anode connect with the input terminal of the second one-way circuit 80.

Specifically, in order to avoid in driving circuit electric current from control terminal 10 flow into cooking apparatus main control chip, cause to lead Wafer damage is controlled, the second diode can be set in the driving circuit, pass through the one-way conduction of diode, it is ensured that drive signal The second end that first switch circuit 20 and second switch circuit 40 can only be flowed to from the ends HEAT, further reaches promotion driving circuit The effect of reliability.

Optionally, as shown in figure 3, driving circuit further includes：Third one-way circuit 90.

Wherein, third one-way circuit 90 has input terminal and output end, the output end of third one-way circuit 90 and the second list First end connection to the input terminal and the first capacitance 70 of circuit 80, the input end grounding of third one-way circuit 90.

Optionally, third one-way circuit 90 includes：Third diode, cathode and the third one-way circuit 90 of third diode Output end connection, third diode anode connect with the input terminal of third one-way circuit 90.

Specifically, third diode can be increased in the driving circuit, by the one-way conduction of diode, realize clamper Effect, it is ensured that when GND level exception, protect device in driving circuit to be punctured or burnt out by induced voltage, further reach promotion The effect of driving circuit reliability.

Optionally, as shown in figure 3, driving circuit further includes：Second capacitance 100.

Wherein, the second capacitance 100 has a first end and a second end, the control of the first end and driving circuit of the second capacitance 100 End 10 processed is connected with the second end of the first capacitance 70, the second end ground connection of the second capacitance 100.

Specifically, the second capacitance 100 can be set in the driving circuit, may be implemented to HEAT by the second capacitance 100 The drive signal filtering clutter for holding input further achievees the effect that promote driving circuit reliability.

Optionally, as shown in figure 3, driving circuit further includes：Third capacitance 110.

Wherein, third capacitance 110 has a first end and a second end, the first end of third capacitance 110 and the first one-way circuit 30 input terminal, the second one-way circuit 80 output end connected with the second end of second switch circuit 40, the of third capacitance 110 Two ends are grounded.

Specifically, third capacitance 110 can be set in the driving circuit, to realize energy storage, and drive signal current compared with Hour, drive signal is amplified, further achievees the effect that promote driving circuit reliability.

Optionally, as shown in figure 3, driving circuit further includes：First resistor 120, second resistance 130,140 and of 3rd resistor 4th resistance 150.

Wherein, first resistor 120 has a first end and a second end, the first end of first resistor 120 and the first capacitance 70 Second end connects, and the second end of first resistor 120 and the control terminal 10 of driving circuit and the first end of the second capacitance 100 connect； Second resistance 130 has a first end and a second end, and the first end of second resistance 130 and the input terminal of the first one-way circuit 30 connect It connects, the second end of second resistance 130 is connect with the output end of the first end of third capacitance 110 and the second one-way circuit 80；Third Resistance 140 has a first end and a second end, and the first end of 3rd resistor 140 is connect with the second end of second switch circuit 40, the The second end of three resistance 140 and the second end of second resistance 130, the first end of third capacitance 110 and the second one-way circuit 80 Output end connects；4th resistance 150 has a first end and a second end, and the of the first end of the 4th resistance 150 and second resistance 130 Two ends, the second end of 3rd resistor 140, the first end of third capacitance 110 are connected with the output end of the second one-way circuit 80, and the 4th The second end of resistance 150 is grounded.

Specifically, first resistor 120, second resistance 130,3rd resistor 140 and the 4th can be set in the driving circuit Resistance 150 avoids flowing into triode and the electric current of diode component is excessive, leads to triode and diode breakdown or burn out, into One step achievees the effect that promote driving circuit reliability.

Optionally, as shown in figure 3, driving circuit further includes：4th one-way circuit 160.

Wherein, the 4th one-way circuit 160 has input terminal and output end, the input terminal and relay of the 4th one-way circuit 160 First control terminal of device 50 is connected with the first end of first switch circuit 20, the output end and relay of the 4th one-way circuit 160 50 the second control terminal is connected with DC power supply.

Optionally, the 4th one-way circuit 160 includes：4th diode, the cathode and the 4th one-way circuit of the 4th diode 160 output end connection, the cathode of the 4th diode are connect with the input terminal of the 4th one-way circuit 160.

Specifically, in order to avoid in driving circuit device by induced voltage puncture or burn out, can be the two of relay 50 The 4th one-way circuit 160 of reverse parallel connection is held, further achievees the effect that promote driving circuit reliability.

Fig. 4 is tied below according to a kind of schematic diagram of the driving circuit of optional relay of the utility model embodiment Fig. 4 is closed a kind of preferred embodiment of the utility model is described in detail.As shown in figure 4, HEAT (i.e. above-mentioned control terminals 10) it is connected to one-chip machine port, driving circuit includes：Triode Q1 (the first i.e. above-mentioned triode), Q2 (i.e. above-mentioned second Triode).Diode D1 (the second i.e. above-mentioned diode), D2 (i.e. above-mentioned third diode) and D3 (i.e. above-mentioned first Diode), capacitance C1 (the second i.e. above-mentioned capacitance 100), C2 (the first i.e. above-mentioned capacitance 70) and C3 (i.e. above-mentioned third electricity 110) and resistance R1-R4 (i.e. above-mentioned 120 to the 4th resistance 150 of first resistor) hold.

When the poles B of Q1 and the extremely short roads C, the B of Q1 extremely high level at this time, then Q1 be connected, due to the one-way conduction performance of D3, Therefore the poles the B level of Q2 will not be made also to be raised, therefore Q2 is not turned on, and will not make jug with heating disk.

When HEAT either high level or low level, because of the presence of C2 capacitances, when needing heating, HEAT sends out pulse Wave makes the poles the K level of D1 draw high, passes through R2 and R3 after C2 and D1, and the poles the B level of Q1 and Q2 is made to draw high, conducting Q1 and Q2.Relay RLY1 is attracted at this time, jug with heating disk.When that need not heat, HEAT keeps low level, because can't pass C2, because The B of this Q1 and Q2 extremely low levels will not be such that Q1 and Q2 is connected.

By the utility model, whichever device is abnormal in this circuit, all Q1 and Q2 will not be made to simultaneously turn on, led Relay is caused to be attracted, heat-generating disc work.

According to the utility model embodiment, a kind of embodiment of cooking apparatus is additionally provided, including：Above-mentioned relay Driving circuit.

Optionally, cooking apparatus is electric pressure cooking saucepan.

Specifically, above-mentioned cooking apparatus can be the equipment such as electric pressure cooking saucepan, electric cooker, cooking machine, in the utility model In above-described embodiment, it is described in detail by taking electric pressure cooking saucepan as an example.

Above-mentioned the utility model embodiment serial number is for illustration only, can not represent the quality of embodiment.

In above-described embodiment of the utility model, all emphasize particularly on different fields to the description of each embodiment, in some embodiment The part not being described in detail may refer to the associated description of other embodiment.

The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art For art personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these improve and Retouching also should be regarded as the scope of protection of the utility model.

Claims (14)

1. a kind of driving circuit of relay, which is characterized in that the driving circuit has control terminal, the driving circuit packet It includes：

First switch circuit, has first end, second end and a third end, the first end of the first switch circuit and relay First control terminal connects, wherein the second control terminal of the relay is connect with DC power supply, the first power supply of the relay End is connect with AC power, and the second source end of the relay is connect by loading with the AC power；

First one-way circuit has input terminal and output end, output end and the first switch electricity of first one-way circuit The second end on road connects, and the input terminal of first one-way circuit is connect with the control terminal of the driving circuit；

Second switch circuit has first end, second end and third end, the first end of the second switch circuit and described first The third end of switching circuit is grounded, the input terminal of the second end of the second switch circuit and first one-way circuit and described The control terminal of driving circuit connects, the third end ground connection of the second switch circuit.

2. driving circuit according to claim 1, which is characterized in that the driving circuit further includes：

First capacitance, has a first end and a second end, the input of the first end of first capacitance and first one-way circuit End is connected with the second end of the second switch circuit, and the second end of first capacitance connects with the control terminal of the driving circuit It connects.

3. driving circuit according to claim 2, which is characterized in that when the control terminal output exchange letter of the driving circuit Number when, the first switch circuit and the second switch circuit turn-on control the load to drive the relay to be closed It starts to work；When the control terminal of the driving circuit exports direct current signal, the first switch circuit and the second switch Circuit turns off, and to drive the relay to disconnect, controls the load and is stopped.

4. driving circuit according to claim 3, which is characterized in that the direct current signal is low level signal.

5. driving circuit according to claim 2, which is characterized in that the driving circuit further includes：

Second one-way circuit has input terminal and output end, the output end of second one-way circuit and the described first unidirectional electricity The input terminal on road is connected with the second end of the second switch circuit, the input terminal of second one-way circuit and first electricity The first end of appearance connects.

6. driving circuit according to claim 5, which is characterized in that the driving circuit further includes：

Third one-way circuit has input terminal and output end, the output end of the third one-way circuit and the described second unidirectional electricity The input terminal on road is connected with the first end of first capacitance, the input end grounding of the third one-way circuit.

7. driving circuit according to claim 6, which is characterized in that the driving circuit further includes：

Second capacitance, has a first end and a second end, the first end of second capacitance and the control terminal of the driving circuit and The second end of first capacitance connects, the second end ground connection of second capacitance.

8. driving circuit according to claim 7, which is characterized in that the driving circuit further includes：

Third capacitance, has a first end and a second end, the input of the first end of the third capacitance and first one-way circuit End, second one-way circuit output end connected with the second end of the second switch circuit, the second of the third capacitance End ground connection.

9. driving circuit according to claim 8, which is characterized in that the driving circuit further includes：

First resistor has a first end and a second end, and the first end of the first resistor and the second end of first capacitance connect It connects, the second end of the first resistor is connect with the first end of the control terminal of the driving circuit and second capacitance；

Second resistance has a first end and a second end, the input of the first end of the second resistance and first one-way circuit End connection, the second end of the second resistance connect with the first end of the third capacitance and the output end of second one-way circuit It connects；

3rd resistor has a first end and a second end, the first end of the 3rd resistor and the second of the second switch circuit End connection, the second end of the 3rd resistor and the second end of the second resistance, the first end of the third capacitance and described The output end of second one-way circuit connects；

4th resistance, has a first end and a second end, the first end of the 4th resistance and the second end of the second resistance, institute The first end of the second end, the third capacitance of stating 3rd resistor is connected with the output end of second one-way circuit, and described The second end of four resistance is grounded.

10. driving circuit according to claim 9, which is characterized in that the driving circuit further includes：

4th one-way circuit, has input terminal and an output end, and the of the input terminal of the 4th one-way circuit and the relay One control terminal is connected with the first end of the first switch circuit, output end and the relay of the 4th one-way circuit Second control terminal is connected with the DC power supply.

11. driving circuit according to claim 10, which is characterized in that

The first switch circuit includes：First triode, the collector of first triode and the first switch circuit First end connection, the base stage of first triode connect with the second end of the first switch circuit, the one or three pole The emitter of pipe is connect with the third end of the first switch circuit；

The second switch circuit includes：Second triode, the collector of second triode and the second switch circuit First end connection, the base stage of second triode connect with the second end of the second switch circuit, the two or three pole The emitter of pipe is connect with the third end of the second switch circuit；

First one-way circuit includes：First diode, the cathode of first diode and first one-way circuit Output end connects, and the anode of first diode is connect with the input terminal of first one-way circuit；

Second one-way circuit includes：Second diode, the cathode of second diode and second one-way circuit Output end connects, and the anode of second diode is connect with the input terminal of second one-way circuit；

The third one-way circuit includes：Third diode, the cathode of the third diode and the third one-way circuit Output end connects, and the anode of the third diode is connect with the input terminal of the third one-way circuit；

4th one-way circuit includes：4th diode, cathode and the 4th one-way circuit of the 4th diode Output end connects, and the cathode of the 4th diode is connect with the input terminal of the 4th one-way circuit.

12. driving circuit according to claim 2, which is characterized in that the load is heat-generating disc.

13. a kind of cooking apparatus, which is characterized in that including：The driving of relay described in any one of claim 1 to 12 Circuit.

14. cooking apparatus according to claim 13, which is characterized in that the cooking apparatus is electric pressure cooking saucepan.