CN210573250U - Control system for toaster - Google Patents
Control system for toaster Download PDFInfo
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- CN210573250U CN210573250U CN201921797887.6U CN201921797887U CN210573250U CN 210573250 U CN210573250 U CN 210573250U CN 201921797887 U CN201921797887 U CN 201921797887U CN 210573250 U CN210573250 U CN 210573250U
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- 238000010438 heat treatment Methods 0.000 claims abstract description 61
- 238000010079 rubber tapping Methods 0.000 claims description 2
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000008429 bread Nutrition 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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Abstract
The utility model discloses a control system for toaster, include: the heating wire working circuit, the first control circuit and the second control circuit are connected with the first control circuit; the heating wire working circuit comprises a first heating wire, and two ends of the first heating wire are connected with an alternating current input live wire and an alternating current input zero line through a first switch; the first heating wire is also connected with a second switch in series; the first control circuit is electrically connected with the first switch and is used for controlling the first switch to be switched off after being switched on for preset time; the first control circuit is also electrically connected with the second switch through a second control circuit, and the first control circuit is used for controlling the second switch to be switched on through the second control circuit after the first switch is switched on and controlling the second switch to be switched off through the second control circuit after the first switch is switched on for a preset time. The utility model relates to a device is less, and the cost is lower.
Description
Technical Field
The utility model relates to an electronic circuit technical field, in particular to a control system for toaster.
Background
In recent years, with the continuous improvement of the quality of life of people, the toaster is widely used by modern families. The existing toaster generally comprises a heating wire working circuit, an electronic board with a control chip, a power supply circuit for supplying power to the electronic board and the like, the baking time of a baking handle is controlled by adopting a mechanical electromagnet switch control circuit, the baking handle automatically bounces after the baking time reaches preset time, the purpose of power failure is realized, but the baking handle can be pressed due to reasons such as faults, so that the baking handle cannot automatically bounce, the heating wire cannot automatically power off, and potential safety hazards exist.
In order to meet the safety regulations and requirements of the toaster and prevent the problem that the heating wire of the toaster cannot be automatically turned off due to the fault of the toaster and other reasons, a power circuit and a secondary control circuit are usually added to further control the connection or disconnection of the heating wire and the power supply.
Therefore, chinese patent publication No. CN203524516U discloses a novel toaster control circuit, but the control circuit involves many devices and has a high cost.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the utility model is to provide a control system for toaster, this system can solve among the prior art more, the higher problem of cost of device.
In order to solve the technical problem, the embodiment of the application adopts the following technical scheme: a control system for a toaster comprising: the heating wire working circuit, the first control circuit and the second control circuit are connected with the first control circuit;
the heating wire working circuit comprises a first heating wire, and two ends of the first heating wire are connected with an alternating current input live wire and an alternating current input zero line through a first switch; the first heating wire is also connected with a second switch in series;
the first control circuit is electrically connected with the first switch and is used for controlling the first switch to be switched off after being switched on for a preset time;
the first control circuit is also electrically connected with the second switch through the second control circuit, and the first control circuit is used for controlling the second switch to be switched on through the second control circuit after the first switch is switched on and controlling the second switch to be switched off through the second control circuit after the first switch is switched on for a preset time. By arranging the two switches, the control chip is used for controlling the first switch to be switched off after the timing time reaches the preset time, and the second control circuit is used for controlling the second switch to be switched off after the timing time reaches the preset time, so that the heating wire can be disconnected from the power supply. The first heating wire can be powered off by opening the second switch even if the first switch cannot be disconnected due to faults, and the related devices are fewer and the cost is lower.
Optionally, the second switch is a relay switch; the coil of the second switch comprises a first connecting end and a second connecting end, the first connecting end is connected with a power supply, and the second connecting end is electrically connected with the output end of the second control circuit. One end of a coil of the relay switch is connected with a power supply, the other end of the coil is connected with the second control circuit, and when the potential of the output end of the second control circuit is lower than the potential of the power supply, the coil is electrified; when the electric potential of the second control output end is not less than the electric potential of the power supply, a passage cannot be formed, the coil is not electrified, the electrification/outage of the coil of the second switch (relay) is controlled by controlling the output electric potential of the second control circuit, the circuit structure is simple, and the cost is low.
Optionally, the first control circuit includes a control chip with a timing function;
the second control circuit comprises a first triode, a second triode and a third triode;
the base electrode of the first triode is used as a first input end of the second control circuit and is electrically connected with a first control output pin of the control chip, the emitting electrode of the first triode is connected with a power supply, and the collecting electrode of the first triode is electrically connected with the base electrode of the third triode;
the base electrode of the second triode is used as a second input end of the second control circuit and is electrically connected with a second control output pin of the control chip, and the collector electrode of the second triode is electrically connected with the emitter electrode of the third triode;
a collector of the third triode is used as an output end of the second control circuit and is electrically connected with a second connecting end of the coil of the second switch so as to control the coil of the second switch to be connected with or disconnected from a power supply;
the control chip is used for starting timing when the first switch is conducted, enabling the first control output pin to output a low level and enabling the second control output pin to output a high level so as to conduct the first triode, the second triode and the third triode, further controlling the second switch coil to be electrified and the second switch to be closed, and enabling the first heating wire to be electrified and work;
after the control chip finishes timing, the control chip is used for controlling the first switch to be switched off so as to control the first heating wire to be powered off; and the first control output pin is enabled to output a high level, and/or the second control output pin is enabled to output a low level, so that the third triode is cut off, and the second switch coil is controlled to be powered off, the second switch is controlled to be powered off, and the first heating wire is powered off. The circuit that has three triode to constitute controls the circular telegram and the outage of second switch coil, has guaranteed that arbitrary triode ends or damages, and the second switch all can't switch on, and the heater strip can both cut off the power supply, satisfies the requirement of ann rule. And the circuit structure is simple, and the cost is lower.
Optionally, the heating device further comprises a second heating wire, and the second heating wire is connected in parallel with the first heating wire and the second switch;
the second heating wire is provided with a tap for tapping from the tap of the second heating wire to obtain a supply voltage. Through setting up the second heater strip, take out the pressure from the second heater strip and obtain supply voltage, simplified supply circuit, the cost is reduced.
Optionally, a tap of the second heating wire is electrically connected to the first connection end of the coil of the second switch, and is used for supplying power to the coil of the second switch. The voltage obtained by voltage pumping is directly used for supplying power to the second switching coil, so that the increase of a power supply circuit is avoided, and the cost is reduced.
Optionally, the first triode is a PNP-type triode, and the second triode and the third triode are both NPN-type triodes. The first triode is set to be a PNP type, and the second triode and the third triode are set to be an NPN type, so that the power-on/power-off of the second switch coil can be better controlled.
Optionally, the base set of the first triode is connected in series with a first resistor. Through setting up first resistance, can reduce input current, protect first triode, prevent that first triode from damaging because input current is too big.
Optionally, an emitter of the first triode is connected to a power supply, and a collector of the first triode is grounded through a second resistor. Through setting up the second resistance, can protect first triode to can stabilize the operating point.
Optionally, a third resistor is connected in series between the collector of the first triode and the base of the third triode. The input current of the base set of the third triode can be reduced by arranging the third resistor, and the third triode is protected.
Optionally, a fourth resistor is connected in series between the base of the second triode and the second control output pin of the control chip; the base electrode of the second triode is connected with the emitting electrode of the second triode through a fifth resistor, and the emitting electrode of the second triode is connected with the ground. Through setting up fourth resistance and fifth resistance, can reduce the input current of the base set of second triode, protect the second triode.
The embodiment of the utility model provides a beneficial effect lies in: by arranging the two switches, the control chip is used for controlling the first switch to be switched off after the timing time reaches the preset time, and the second control circuit is used for controlling the second switch to be switched off after the timing time reaches the preset time, so that the heating wire can be disconnected from the power supply. It is achieved that the first heating filament can be de-energized by opening the second switch even if the first switch cannot be opened due to a fault, and that fewer components are involved and the cost is lower.
Drawings
Fig. 1 is an electrical schematic architecture diagram of a control system according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a control system according to an embodiment of the present invention.
Detailed Description
Various aspects and features of the present application are described herein with reference to the drawings.
It will be understood that various modifications may be made to the embodiments of the present application. Accordingly, the foregoing description should not be construed as limiting, but merely as exemplifications of embodiments. Those skilled in the art will envision other modifications within the scope and spirit of the application.
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with a general description of the application given above and the detailed description of the embodiments given below, serve to explain the principles of the application.
These and other characteristics of the present application will become apparent from the following description of preferred forms of embodiment, given as non-limiting examples, with reference to the attached drawings.
It should also be understood that, although the present application has been described with reference to some specific examples, a person of skill in the art shall certainly be able to achieve many other equivalent forms of application, having the characteristics as set forth in the claims and hence all coming within the field of protection defined thereby.
The above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description when taken in conjunction with the accompanying drawings.
Specific embodiments of the present application are described hereinafter with reference to the accompanying drawings; however, it is to be understood that the disclosed embodiments are merely exemplary of the application, which can be embodied in various forms. Well-known and/or repeated functions and constructions are not described in detail to avoid obscuring the application of unnecessary or unnecessary detail. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present application in virtually any appropriately detailed structure.
The specification may use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which may each refer to one or more of the same or different embodiments in accordance with the application.
An embodiment of the present invention provides a control system for a toaster, as shown in fig. 1, including: a heating wire working circuit 3, a first control circuit 1 and a second control circuit 2;
the heating wire working circuit comprises a first heating wire M1, and two ends of the first heating wire M1 are connected with an alternating current input live wire and an alternating current input zero wire through a first switch S1; the first heating wire M1 is also connected in series with a second switch JQ1 (shown in FIG. 2); the first control circuit 1 is electrically connected with the first switch S1, and the first control circuit 1 is used for controlling the first switch S1 to be switched off after being switched on for a preset time;
the first control circuit 1 is also electrically connected with the second switch JQ1 through the second control circuit 2, and the first control circuit 1 is used for controlling the second switch to turn on JQ1 through the second control circuit after the first switch S1 is turned on and controlling the second switch JQ1 to turn off through the second control circuit 2 after the first switch S1 is turned on for a preset time. In this embodiment, the first heating wires M1 may be arranged in series according to actual needs, and preferably, two heating wires may be arranged in series.
In an implementation process, as shown in fig. 2 in particular, in this embodiment, the second switch JQ1 is a relay switch; the coil of the second switch comprises a first connecting end 21 and a second connecting end 22, the first connecting end 21 is connected with a power supply, and the second connecting end 22 is electrically connected with the output end of the second control circuit. The first connecting end and the second connecting end are also connected with a diode D1 in series.
Specifically, the first control circuit 1 includes a control chip 11 with a timing function, and the control chip may be an eight-pin IC or a sixteen-pin IC, which may be specifically selected according to an actual situation. As shown in fig. 2, taking a sixteen-pin IC as an example, the first pin P1.0 to the fourth pin P1.6 are first IO input pins, the fifth pin P0.7 is a second IO output pin, and the sixth pin P0.6 is a second IO input pin; the fourteenth pin P2.0 is a first control output pin, the eighth pin C2 is a second control output pin, the seventh pin C1 is a third control output pin, the sixteenth pin P2.2 is a fourth control output pin, and the fifteenth pin P2.1 is a fifth control output pin.
The second control circuit 2 comprises a first triode Q1, a second triode Q2 and a third triode Q3; the first triode is a PNP triode, and the second triode and the third triode are both NPN triodes.
A base electrode of a first triode Q1 is used as a first input end of the second control circuit and is electrically connected with a first control output pin P2.0 of the control chip 11, an emitting electrode of the first triode Q1 is connected with a power supply, and a collecting electrode of the first triode Q1 is electrically connected with a base electrode of the third triode Q3;
the base of the second triode Q2 is used as a second input end of the second control circuit and is electrically connected with the second control output pin C2 of the control chip 11, and the collector of the second triode Q2 is electrically connected with the emitter of the third triode Q3;
the collector of the third triode Q3 is used as the output end of the second control circuit and is electrically connected with the second connection end 22 of the coil of the second switch to control the coil of the second switch to be connected or disconnected with the power supply;
the control chip 11 is configured to start timing when the first switch is turned on, and enable the first control output pin P2.0 to output a low level and the second control output pin C2 to output a high level, so as to turn on the first triode Q1, the second triode Q2 and the third triode Q3, and further control the second switch coil to be energized and the second switch to be closed, so as to energize the first heating wire for operation;
after the timing of the control chip is finished, the control chip 11 is used for controlling the first switch to be switched off so as to control the first heating wire to be powered off; and the first control output pin P2.0 outputs high level, and/or the second control output pin C2 outputs low level, so that the third triode Q3 is cut off, and the second switch coil is controlled to be powered off, the second switch is controlled to be powered off, and the first heating wire is powered off. In this embodiment, the specific implementation process may further include an electromagnet coil S1-L, as shown in fig. 2, the electromagnet coil S1-L is controllably connected to the control chip, and specifically, the electromagnet coil may be connected in parallel with the coil of the second switch (connected to CN 1), that is, one end of the electromagnet coil is connected to the power supply, and the other end of the electromagnet coil is connected to the output end of the second control circuit. Thus, the electromagnet coil is controlled by the control chip and the second control circuit at the same time as the coil of the second switch. When the S1 is turned on, the first control output pin P2.0 of the first control chip outputs a low level, and the second control output pin C2 outputs a high level, so that the first transistor Q1, the second transistor Q2, and the third transistor Q3 are all turned on, the electromagnet coil and the second switch coil are energized, the second switch is turned on, and the first switch is continuously turned on, so that the first heating wire is energized to operate, when the heating is performed for a predetermined time, the first control chip can enable the first control output pin P2.0 to output a high level, and/or enable the second control output pin C2 to output a low level, so that the third transistor Q3 is turned off, and the second switch coil and the electromagnet coil are controlled to be turned off, so that the second switch and the first switch are turned off, and the first heating wire is turned off.
The first switch S1 is closed when the electromagnet is energized, and the first switch S1 is open when the electromagnet is de-energized. Just so can realize, control chip control and outage when the electro-magnet, but because bread blocks reasons such as, cause the handle of toasting and can't bounce, and then when causing the unable disconnection of first switch, still can make first heater strip outage through breaking off the second switch, prevented that the heater strip from lasting the circumstances of circular telegram from taking place. Moreover, the utility model has fewer devices and lower cost.
In this embodiment, the control system further comprises a second heating wire M2, the second heating wire M2 being connected in parallel with the first heating wire M1 and a second switch JQ 1; the second heating wire M2 is provided with taps for deriving the supply voltage from the tap taps of the second heating wire. A tap of the second heating wire may be electrically connected to the first connection 21 of the coil of the second switch for supplying power to the coil of the second switch. And the tap of the second heater may also be electrically connected to one end of the electromagnet coil S1-L of the first switch for powering the electromagnet coil. The second switch coil is directly powered by pumping from the second heating wire, so that a power supply circuit is not required to be added, the circuit is simplified, and the cost is reduced.
In the implementation of this embodiment, a first resistor is connected in series to the base set of the first transistor Q1. The first resistor R1 is arranged to reduce the input current, so that the first triode Q1 is protected and prevented from being damaged due to the fact that the input current is too large. The emitter of the first transistor Q1 is connected to a power supply, and the collector of the first transistor is connected to ground through a second resistor R2. Through setting up the second resistance, can protect first triode to can stabilize the operating point. A third resistor R3 is connected in series between the collector of the first transistor Q1 and the base of the third transistor Q3. The input current of the base set of the third triode can be reduced by arranging the third resistor, and the third triode is protected. A fourth resistor R4 is connected in series between the base of the second triode Q2 and the second control output pin C2 of the control chip 11; the base of the second triode Q2 and the emitter of the second triode Q2 are also connected through a fifth resistor R5, and the emitter of the second triode is connected with the ground. Through setting up fourth resistance and fifth resistance, can reduce the input current of the base set of second triode, protect the second triode.
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the protection scope of the present invention is defined by the claims. Various modifications and equivalents of the invention can be made by those skilled in the art within the spirit and scope of the invention, and such modifications and equivalents should also be considered as falling within the scope of the invention.
Claims (10)
1. A control system for a toaster, comprising: the heating wire working circuit, the first control circuit and the second control circuit are connected with the first control circuit;
the heating wire working circuit comprises a first heating wire, and two ends of the first heating wire are connected with an alternating current input live wire and an alternating current input zero line through a first switch; the first heating wire is also connected with a second switch in series;
the first control circuit is electrically connected with the first switch and is used for controlling the first switch to be switched off after being switched on for a preset time;
the first control circuit is also electrically connected with the second switch through the second control circuit, and the first control circuit is used for controlling the second switch to be switched on through the second control circuit after the first switch is switched on and controlling the second switch to be switched off through the second control circuit after the first switch is switched on for a preset time.
2. The control system for a toaster as claimed in claim 1, wherein said second switch is a relay switch; the coil of the second switch comprises a first connecting end and a second connecting end, the first connecting end is connected with a power supply, and the second connecting end is electrically connected with the output end of the second control circuit.
3. The control system for a toaster as claimed in claim 2, wherein said first control circuit comprises a control chip with a timing function;
the second control circuit comprises a first triode, a second triode and a third triode;
the base electrode of the first triode is used as a first input end of the second control circuit and is electrically connected with a first control output pin of the control chip, the emitting electrode of the first triode is connected with a power supply, and the collecting electrode of the first triode is electrically connected with the base electrode of the third triode;
the base electrode of the second triode is used as a second input end of the second control circuit and is electrically connected with a second control output pin of the control chip, and the collector electrode of the second triode is electrically connected with the emitter electrode of the third triode;
a collector of the third triode is used as an output end of the second control circuit and is electrically connected with a second connecting end of the coil of the second switch so as to control the coil of the second switch to be connected with or disconnected from a power supply;
the control chip is used for starting timing when the first switch is conducted, enabling the first control output pin to output a low level and enabling the second control output pin to output a high level so as to conduct the first triode, the second triode and the third triode, further controlling the second switch coil to be electrified and the second switch to be closed, and enabling the first heating wire to be electrified and work;
after the control chip finishes timing, the control chip is used for controlling the first switch to be switched off so as to control the first heating wire to be powered off; and the first control output pin is enabled to output a high level, and/or the second control output pin is enabled to output a low level, so that the third triode is cut off, and the second switch coil is controlled to be powered off, the second switch is controlled to be powered off, and the first heating wire is powered off.
4. The control system for a toaster as claimed in claim 1, further comprising a second heating wire connected in parallel with said first heating wire and a second switch;
the second heating wire is provided with a tap for tapping from the tap of the second heating wire to obtain a supply voltage.
5. The control system for a toaster as claimed in claim 4, wherein a tap of said second heating wire is electrically connected to a first connection of a coil of said second switch for supplying power to said coil of said second switch.
6. The control system for a toaster as set forth in claim 3, wherein said first transistor is a PNP transistor, and said second and third transistors are NPN transistors.
7. The control system for a toaster as claimed in claim 3, wherein a first resistor is connected in series with a base set of said first transistor.
8. The control system for a toaster as set forth in claim 3, wherein an emitter of said first transistor is connected to a power source and a collector of said first transistor is connected to ground through a second resistor.
9. The control system for a toaster as set forth in claim 3, wherein a third resistor is connected in series between a collector of said first transistor and a base of said third transistor.
10. The control system for a toaster as claimed in claim 3, wherein a fourth resistor is connected in series between a base of said second transistor and a second control output pin of said control chip; the base electrode of the second triode is connected with the emitting electrode of the second triode through a fifth resistor, and the emitting electrode of the second triode is connected with the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921797887.6U CN210573250U (en) | 2019-10-24 | 2019-10-24 | Control system for toaster |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921797887.6U CN210573250U (en) | 2019-10-24 | 2019-10-24 | Control system for toaster |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210573250U true CN210573250U (en) | 2020-05-19 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921797887.6U Active CN210573250U (en) | 2019-10-24 | 2019-10-24 | Control system for toaster |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210573250U (en) |
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2019
- 2019-10-24 CN CN201921797887.6U patent/CN210573250U/en active Active
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