CN217469433U - Toaster protection circuit - Google Patents
Toaster protection circuit Download PDFInfo
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- CN217469433U CN217469433U CN202220386413.8U CN202220386413U CN217469433U CN 217469433 U CN217469433 U CN 217469433U CN 202220386413 U CN202220386413 U CN 202220386413U CN 217469433 U CN217469433 U CN 217469433U
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Abstract
The embodiment of the utility model discloses a toaster protection circuit, which comprises a drive circuit, a control circuit, a switch circuit and an electromagnet coil; the input sides of the driving circuit and the control circuit are electrically connected with an operation part of the toaster, and the switching circuit is used for controlling the electromagnet coil to be powered on and powered off under the condition that an electric signal is received from a user to trigger the operation part, so that the power supply of the toaster is isolated under the condition that the electromagnet coil is powered off. The utility model discloses toaster protection circuit sets up the break-make of second control chip and peripheral timing circuit's operating time common control electro-magnet coil simultaneously based on the condition of switching on of first field effect transistor and/or second triode to realize duplicate protection function, whole circuit is simple, and application scope is wide.
Description
Technical Field
The utility model relates to a protection circuit technical field, concretely relates to toaster protection circuit.
Background
Toaster, i.e. toaster, automatic slice toaster, is an electric heating cooking utensil specially used for toasting slice of bread. The bread slice can be baked to be brown, the fragrance of the bread slice is stronger, the taste of the bread slice is better, and the appetite of the bread slice is promoted. In the production process of the toaster, in order to meet the UL safety standard, a power circuit and a control circuit are generally added on the basis of an original electronic board as secondary devices in the market at present, so that not only is the circuit complicated, but also the use cost is increased.
Chinese utility model patent with grant publication number CN212258387U discloses a toaster protection circuit, including timing chip U1, triode Q1, electromagnet T, power supply M and diode D1, power supply M connects the anode of diode D1, the cathode of diode D1 connects resistance R10, the other end of resistance R10 connects electric capacity EC1 and resistance R11, the other end of resistance R11 connects resistance R9, electric capacity C3, electric capacity E2 and the cathode of diode Z1, the other end of electric capacity EC1 connects the other end of electric capacity E2, the other end of resistance R9, the other end of electric capacity C3, the anode of diode Z1 and switch K1. The circuit has many components and complex structure, can not effectively carry out secondary protection on the circuit, and can not solve the technical problem.
SUMMERY OF THE UTILITY MODEL
In view of the above problem that prior art exists, the utility model provides an object of the embodiment provides a toaster protection circuit, and the circuit is simple, and application scope is wide, and promotes the electrical safety greatly.
The embodiment of the utility model adopts the technical proposal that the toaster protection circuit comprises a drive circuit, a control circuit, a switch circuit and an electromagnet coil;
the input sides of the driving circuit and the control circuit are electrically connected with an operation part of the toaster, and the switching circuit is used for controlling the electromagnet coil to be powered on and powered off under the condition that an electric signal is received from a user to trigger the operation part, so that the power supply of the toaster is isolated under the condition that the electromagnet coil is powered off. In this embodiment, drive circuit and control circuit all need with under the condition that control switch circuit switched on, just can energize to the electro-magnet coil, and then realize the secondary protection to the circuit, and the circuit is simple, and promotes the power consumption security greatly.
In some embodiments of the present invention, the driving circuit includes a first oscillating resistor, a first oscillating capacitor, a second control chip and a first resistor, the first oscillating resistor is electrically connected to the first oscillating capacitor at the second pin and the third pin of the second control chip respectively, one end of the first resistor is electrically connected to the first pin of the second control chip, and the other end is electrically connected to the switching circuit. In this embodiment, the first oscillation resistor and the first oscillation capacitor are used to form an oscillation circuit on the periphery of the second control chip, and when the oscillation time reaches, the circuit power supply in the switch circuit is turned off, so that the first field-effect transistor is powered off, and then the electromagnet coil is powered off, thereby preventing potential safety hazards caused by overheating.
In some embodiments of the present invention, the switch circuit includes a 12V power supply, a first triode, a second triode, a first field effect transistor, a second resistor, and a third resistor, wherein a base of the first triode is electrically connected to the first resistor, an emitter of the first triode is grounded, and a collector of the first triode is electrically connected to one end of the second resistor;
the other end of the second resistor is electrically connected with the third resistor, and two ends of the third resistor are respectively and electrically connected with the second resistor and the first field effect transistor;
the 12V power supply is electrically connected with the electromagnet coil through the second triode and the first field effect transistor. In the embodiment, only after the first field effect transistor and the second triode are simultaneously switched on, the electromagnet coil can be switched on, so that the overall safety of the circuit is greatly enhanced.
In some embodiments of the present invention, when the switch circuit receives the control signal of the external input, according to the on-off of the first fet and/or the second triode, the 12V power supply supplies power to or cuts off power from the electromagnet coil. In this embodiment, as long as one of the first field effect transistor and the second triode fails, the electromagnet coil cannot be conducted, and safety is further enhanced through double protection.
In some embodiments of the present invention, the control circuit has a timing circuit, which includes a first control chip, a fourth resistor, a fifth resistor, and a sixth resistor, the second pin of the first control chip is electrically connected to the fourth resistor, the third pin is electrically connected to the fifth resistor, and the fourth pin is electrically connected to the sixth resistor. In this embodiment, through setting up the timing circuit that a plurality of resistances formed, can make first control chip effectively monitor operating time to prevent the potential safety hazard that overheated causes.
In some embodiments of the present invention, the fifth pin of the first control chip is electrically connected to the base of the second triode, the emitter of the second triode is grounded, and the collector is electrically connected to the first field effect transistor. In this embodiment, the first field effect transistor connected to the second triode can control the on/off of the electromagnet coil, thereby forming dual protection.
In some embodiments of the utility model, the collecting electrode of second triode still is connected with electromagnet coil's one end, electromagnet coil's the other end passes through first field effect transistor with the 12V power is connected, first field effect transistor, second triode are realized with the mode that switches on or ends the 12V power is to electromagnet coil's power supply or outage. In this embodiment, based on the condition of switching on of first field effect transistor and second triode, make the 12V power supply to the electromagnet coil power supply, and then supply power to the toaster, avoid the safety problem because the heating of overlength leads to.
In some embodiments of the present invention, the power supply of the toaster is configured as a 120V grid power supply. In this embodiment, the 120V grid power supply is adopted, and the power supply voltage is smaller and the security is high compared with the 220V grid power supply.
In some embodiments of the present invention, the user operated component is configured as a toaster handle; the electrical signal is triggered when the toaster handle is depressed. In this embodiment, after the first control chip and the second control chip detect the electric signal triggered by the user, the electromagnet coil is powered on or powered off based on the conduction condition of the first field effect transistor and/or the second triode, so that the power utilization safety of the toaster is improved.
In some embodiments of the present invention, there is also provided a toaster configured with the protection circuit for a toaster as described above.
Compared with the prior art, the utility model discloses beneficial effect lies in: the utility model discloses toaster protection circuit based on the condition of switching on of first field effect transistor and/or second triode sets up the break-make of second control chip and peripheral timing circuit's operating time common control electro-magnet coil simultaneously to realize duplicate protection function, whole circuit is simple, and application scope is wide.
Drawings
In the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. Like reference numerals having letter suffixes or different letter suffixes may represent different instances of similar components. The drawings illustrate various embodiments, by way of example and not by way of limitation, and together with the description and claims, serve to explain the embodiments of the invention. The same reference numbers will be used throughout the drawings to refer to the same or like parts, where appropriate. Such embodiments are illustrative, and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.
Fig. 1 is a schematic diagram of the overall circuit connection of the toaster protection circuit according to the embodiment of the present invention.
Fig. 2 is a schematic circuit connection diagram of a driving circuit of the toaster protection circuit according to the embodiment of the present invention.
Fig. 3 is a schematic circuit connection diagram of a control circuit of the toaster protection circuit according to the embodiment of the present invention.
Fig. 4 is a schematic circuit connection diagram of the switching circuit of the toaster protection circuit according to the embodiment of the present invention.
Reference numerals:
u1 — first control chip; u2-second control chip; r10 — first oscillation resistance; c4 — first oscillation capacitance; r18 — first resistance; r22 — second resistance; r37 — third resistance; r5-fourth resistor; r6-fifth resistor; r4-sixth resistance; r21 — seventh resistor; r15 — eighth resistance; q1-first triode; q2-second triode; q3-third transistor; MOS 1-first field effect transistor; VR 1-variable resistor; SW 1-first key; SW 2-second button; SW 3-third button; SW 2-1-first switch; SW 3-2-second switch; an L-fire line; the N-zero line.
Detailed Description
In order to make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, the accompanying drawings of the embodiment of the present invention are combined below to clearly and completely describe the technical scheme of the embodiment of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of "first," "second," and similar terms in the description herein do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
An object of the utility model is to provide a toaster protection circuit based on the condition of switching on of first field effect transistor and/or second triode, sets up the break-make of second control chip and peripheral timing circuit's operating time common control electro-magnet coil simultaneously to realize duplicate protection function, whole circuit is simple, and application scope is wide.
In some embodiments of the present invention, as shown in fig. 1 to 4, the present invention includes a driving circuit, a control circuit, a switching circuit, and an electromagnet coil; the input sides of the driving circuit and the control circuit are electrically connected with an operation part of the toaster, and the switching circuit is used for controlling the electrification and the outage of the electromagnet coil under the condition that an electric signal is received from a user to trigger the operation part, so that the power supply of the toaster is isolated under the condition that the electromagnet coil is in outage. Preferably, the user operating part is configured as a toaster handle; the electrical signal is triggered when the toaster handle is depressed.
Further, as shown in fig. 1 to fig. 2, the driving circuit includes a first oscillation resistor R10, a first oscillation capacitor C4, a second control chip U2, and a first resistor R18, the first oscillation resistor R10 and the first oscillation capacitor C4 are respectively and electrically connected to a second pin VCC terminal (introducing a high level signal VCC1) and a third pin OSC terminal of the second control chip U2, one end of the first resistor R18 is electrically connected to a first pin RELAY terminal of the second control chip U2, and the other end is electrically connected to the switching circuit. Preferably, the second control chip U2 is a model a0201F, which has high stability and is economical and practical.
Further, the switch circuit comprises a 12V power supply, a first triode Q1, a second triode Q2, a first field effect transistor MOS1, a second resistor R22 and a third resistor R37, wherein the base of the first triode Q1 is electrically connected with the first resistor R18, the emitter is grounded, and the collector is electrically connected with one end of the second resistor R22; the other end of the second resistor R22 is electrically connected with a third resistor R37, and two ends of the third resistor R37 are respectively and electrically connected with the second resistor R22 and the first field effect transistor MOS 1; the 12V power supply is electrically connected with the electromagnet coil through a second triode Q2 and a first field effect transistor MOS 1. Preferably, the first field effect transistor MOS1 may be one of a PMOS transistor (P channel type) or an NMOS transistor (N channel type), which is not limited explicitly herein.
Further, when the switch circuit receives an externally input control signal, the electromagnet coil is powered on or powered off through the 12V power supply according to the on and off of the first field effect transistor MOS1 and/or the second triode Q2. Preferably, the 12V power supply for supplying power to the solenoid coil is controlled by the first fet MOS1, and the solenoid coil is also controlled by the second transistor Q2, and the 12V power supply outputs power to the solenoid coil based on the condition that the first fet MOS1 and the second transistor Q2 are simultaneously turned on. For only rely on the technical scheme of triode control electromagnet coil among the prior art, the embodiment of the utility model provides an in the first field effect transistor MOS1 control electromagnet coil that increases can realize the duplicate protection to the circuit.
In some embodiments of the present invention, as shown in fig. 1 and 3, the control circuit has a timing circuit, which includes a first control chip U1, a fourth resistor R5, a fifth resistor R6, and a sixth resistor R4, a high level signal VCC2 is introduced into the first pin VDD of the first control chip U1, the second pin portb.1/OSC1 of the first control chip U1 is electrically connected to the fourth resistor R5, the third pin portb.0/OSCO is electrically connected to the fifth resistor R6, the fourth pin portb.3/RESET is electrically connected to the sixth resistor R4, a timing circuit formed by the fourth resistor R5, the fifth resistor R6, and the sixth resistor R4 is disposed at the periphery of the U1 of the first control chip, so as to form a variable resistor VR1 for timing, and at this time, the first control chip U1 can monitor different working time based on the variable resistor VR1, so as to prevent the safety hazard caused by overheating of the toaster.
Further, the sixth pin porta.1 of the first control chip U1 is connected to the first key SW1, and the seventh pin porta.0 is connected to the second key SW2, so that when a user needs to manually operate the toaster, the user can press the first key SW1 or the second key SW2, and at this time, the first control chip U1 can detect an electrical signal output from the first key SW1 or the second key SW2, so as to perform corresponding operations.
In some embodiments of the present invention, as shown in fig. 1 and 4, the fifth pin porta.2/TO end of the first control chip U1 is electrically connected TO the base of the second transistor Q2, the emitter of the second transistor Q2 is grounded, the collector is electrically connected TO the first fet MOS1, the base of the second transistor Q2 passes through the seventh resistor R21 and the eighth resistor R15 TO introduce the trigger level, and a manual switch for stopping the second transistor Q2 is provided between the base of the second transistor Q2 and the emitter. Preferably, the first control chip U1 is a main control chip, and may specifically adopt SH69P21-SOP8 type, which has the advantages of low power consumption, high safety, and the like.
Further, the collector of the second triode Q2 is also connected to one end of the electromagnet coil, the other end of the electromagnet coil is connected to the 12V power supply through the first field-effect transistor MOS1, and the first field-effect transistor MOS1 and the second triode Q2 are turned on or off to supply or cut off power from the 12V power supply to the electromagnet coil.
Further, after a user presses a handle of the toaster, the first control chip U1 and the second control chip start to work, the first control chip U1 is responsible for controlling the conduction of the second triode Q2 all the way, the second control chip U2 is responsible for controlling the conduction of the first field-effect transistor MOS1 all the way, and after the first field-effect transistor MOS1 and the second triode Q2 are conducted simultaneously, the electromagnet coil can be electrified and attracted. If any element in the circuit where the first control chip U1 is located breaks down, which causes the second triode Q2 to be always conducted and the electromagnet coil to be always in the pull-in state, the timing circuit of the first control chip U1, after detecting the break, informs the second control chip U2 to disconnect the first field effect transistor MOS1 through the first triode Q1, thereby disconnecting the electromagnet coil. Vice versa, if the circuit of the second control chip U2 is failed, the first control chip U1 can also open the electromagnet coil. Preferably, when the electromagnet coil is energized, the first switch SW2-1 and the second switch SW3-2 are turned on, so that the live line L and the neutral line N of the power supply of the toaster are energized.
Further, when the toaster fails to automatically power off, the user can also emergency power off the toaster by manually pressing the third button SW3, and when the third button SW3 is pressed, the second transistor Q2 connected thereto is powered off. Because the second triode Q2 is disconnected, even if the path of the first field effect transistor MOS1 can be conducted, the power supply for the electromagnet coil can not be continuously supplied by the 12V power supply, and the toaster stops running. Through the arrangement, on the premise of ensuring the whole continuity of the circuit, the secondary protection function can be realized based on the dual-control chip, and the emergency power-off can be carried out according to the user instruction, so that the power utilization safety of the toaster is greatly improved.
In some embodiments of the present invention, there is also provided a toaster configured with the protection circuit for a toaster as described above. Preferably, the power supply of the toaster is configured to at least satisfy 120V grid power, which is not explicitly defined herein.
To sum up, the utility model provides a pair of toaster protection circuit, based on the condition of switching on of first field effect transistor and/or second triode, set up the break-make of second control chip and peripheral timing circuit's operating time common control electro-magnet coil simultaneously to realize duplicate protection function, whole circuit is simple, and application scope is wide.
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 toaster protection circuit is characterized by comprising a driving circuit, a control circuit, a switch circuit and an electromagnet coil;
the input sides of the driving circuit and the control circuit are electrically connected with an operation part of the toaster, and the switching circuit is used for controlling the electromagnet coil to be powered on and powered off under the condition that an electric signal is received from a user to trigger the operation part, so that the power supply of the toaster is isolated under the condition that the electromagnet coil is powered off.
2. The toaster protection circuit according to claim 1, wherein the driving circuit comprises a first oscillating resistor, a first oscillating capacitor, a second control chip and a first resistor, the first oscillating resistor and the first oscillating capacitor are electrically connected to the second pin and the third pin of the second control chip, respectively, one end of the first resistor is electrically connected to the first pin of the second control chip, and the other end of the first resistor is electrically connected to the switching circuit.
3. The toaster protection circuit according to claim 2, wherein said switching circuit comprises a 12V power supply, a first transistor, a second transistor, a first fet, a second resistor, and a third resistor, wherein a base of said first transistor is electrically connected to said first resistor, an emitter of said first transistor is grounded, and a collector of said first transistor is electrically connected to one end of said second resistor;
the other end of the second resistor is electrically connected with the third resistor, and two ends of the third resistor are respectively and electrically connected with the second resistor and the first field effect transistor;
the 12V power supply is electrically connected with the electromagnet coil through the second triode and the first field effect transistor.
4. The toaster protection circuit according to claim 3, wherein the switching circuit powers on or powers off the electromagnet coil via the 12V power supply according to the on/off state of the first field effect transistor and/or the second triode when receiving an externally input control signal.
5. The toaster protection circuit according to claim 4, wherein the control circuit has a timing circuit comprising a first control chip, a fourth resistor, a fifth resistor, and a sixth resistor, wherein a second pin of the first control chip is electrically connected to the fourth resistor, a third pin is electrically connected to the fifth resistor, and a fourth pin is electrically connected to the sixth resistor.
6. The toaster protection circuit according to claim 5, wherein a fifth pin of said first control chip is electrically connected to a base of said second transistor, an emitter of said second transistor is grounded, and a collector of said second transistor is electrically connected to said first field effect transistor.
7. The toaster protection circuit according to claim 6, wherein a collector of said second transistor is further connected to one end of an electromagnet coil, another end of said electromagnet coil is connected to said 12V power supply through said first fet, and said first fet and said second transistor are turned on or off to supply or disconnect power to said electromagnet coil from said 12V power supply.
8. The toaster protection circuit of claim 1, wherein a power supply of the toaster is configured as a 120V grid power supply.
9. The toaster protection circuit of claim 1, wherein the operating member is configured as a toaster handle;
the electrical signal is triggered when the toaster handle is depressed.
10. Toaster, characterized in that a toaster protection circuit according to any of the claims 1 to 9 is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220386413.8U CN217469433U (en) | 2022-02-24 | 2022-02-24 | Toaster protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220386413.8U CN217469433U (en) | 2022-02-24 | 2022-02-24 | Toaster protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217469433U true CN217469433U (en) | 2022-09-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220386413.8U Active CN217469433U (en) | 2022-02-24 | 2022-02-24 | Toaster protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217469433U (en) |
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2022
- 2022-02-24 CN CN202220386413.8U patent/CN217469433U/en active Active
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