CN217467509U - Control circuit and oven - Google Patents
Control circuit and oven Download PDFInfo
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- CN217467509U CN217467509U CN202221327416.0U CN202221327416U CN217467509U CN 217467509 U CN217467509 U CN 217467509U CN 202221327416 U CN202221327416 U CN 202221327416U CN 217467509 U CN217467509 U CN 217467509U
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Abstract
The utility model discloses a control circuit and oven, control circuit includes: the switching circuit is provided with a power supply switch, and the power supply switch is electrically connected between a first power supply and a load; the sampling circuit is provided with a voltage division unit, the voltage division unit is electrically connected between the first power supply and the ground, the voltage division unit comprises a first voltage division device, one end of the first voltage division device is grounded, and the other end of the first voltage division device is led out of the output end of the sampling circuit; the sampling channel of the analog-to-digital conversion of the control chip is connected to the output end of the sampling circuit; the execution circuit is connected with the control chip and used for receiving the control signal of the control chip and responding to and controlling the power supply switch to be switched on and off based on the control signal; the oven comprises the control circuit and hot air, the upper heating pipe module and the lower heating pipe module are respectively used as loads of the switch circuit, and the control circuit has an overvoltage protection function.
Description
Technical Field
The utility model relates to the technical field of circuits, in particular to control circuit and oven.
Background
The electric device of oven has fixed rated voltage, if surpass rated voltage, the electric device can damage, but among the practical process, often can appear the unstable condition of commercial power, perhaps appear because use in different countries, the commercial power voltage of different countries is different to the condition that voltage surpassed oven rated voltage appears.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a control circuit and oven can be when mains voltage exceedes predetermined rated voltage, the switch of cutting off load to play the effect of protection load.
In a first aspect, an embodiment of the present invention provides a control circuit, including:
the switching circuit is provided with a power supply switch, and the power supply switch is electrically connected between a first power supply and a load;
the sampling circuit is provided with a voltage division unit, the voltage division unit is electrically connected between the first power supply and the ground, the voltage division unit comprises a first voltage division device, one end of the first voltage division device is electrically connected with the ground, and the other end of the first voltage division device is led out of the output end of the sampling circuit;
the sampling channel of the analog-to-digital conversion of the control chip is connected to the output end of the sampling circuit;
and the execution circuit is connected with the control chip and used for receiving the control signal of the control chip and responding and controlling the power supply switch to be switched on and off based on the control signal.
The utility model discloses control circuit has following beneficial effect at least: when the voltage value of the first power supply exceeds the rated voltage, the sampling circuit transmits the voltage value obtained by voltage division of the voltage division unit to the control chip, the control chip converts the voltage value into a digital value, and then the digital value is compared with a standard value preset based on the rated voltage of the electric device, the control chip can judge that the circuit is over-voltage according to the comparison result, the control chip outputs a control signal, the control signal flows through the execution circuit to control the conduction of the electric device of the execution circuit, so that the power supply switch in the control switch circuit is disconnected, the connection between the load and the first power supply is cut off, and the effect of protecting the electric device in the circuit is achieved.
In some embodiments of the present invention, the number of the switch circuits and the number of the execution circuits are both multiple, and the switch circuits and the execution circuits correspond to one another; and all the execution circuits receive the control signals of the control chip and control the on-off of the power supply switch corresponding to the execution circuits.
In some embodiments of the utility model, the control circuit still includes voltage conversion circuit, the first power is as voltage conversion circuit's input converts out second power and third power, the first power is mains supply, the second power is 12v DC power supply, the third power is 5v DC power supply, the third power is used for control chip's power supply.
In some embodiments of the utility model, the execution circuit includes electromagnetic relay and triode, electromagnetic relay passes through magnetic control power switch's switching, electromagnetic relay electric connection is between second power and triode collecting electrode, triode electric connection to control chip's output pin receives control chip's control signal.
The utility model discloses an in some embodiments, the base of triode is connected to through resistance control chip's output pin, the projecting pole ground connection of triode, control signal control the switching on of the base and the collecting electrode of triode, when the triode switches on, electromagnetic relay produces magnetic force, control the power switch disconnection.
In some embodiments of the present invention, the execution circuit further includes a diode, the diode anode is electrically connected to the triode collector, the diode cathode is connected to the second power supply, the diode is in the triode is conducted to prevent reverse voltage breakdown in the twinkling of an eye for protection.
In some embodiments of the present invention, the voltage dividing unit further includes a second voltage dividing device electrically connected between the first power source and the sampling circuit output end.
In some embodiments of the present invention, the sampling circuit further comprises a filter electrically connected between the output of the sampling circuit and the ground.
In some embodiments of the present invention, the filter device includes a voltage regulator tube, a first capacitor and a second capacitor, the first capacitor is used for filtering high frequency signals, and the second capacitor is used for filtering low frequency signals.
In a second aspect, an embodiment of the present invention provides an oven, including last heating pipe module, lower heating pipe module, hot air module and as above the first aspect control circuit, last heating pipe module, lower heating pipe module and hot air module are connected as switch circuit's load respectively among the switch circuit.
The utility model discloses oven has following beneficial effect at least: control circuit in the oven, can be when the voltage value when first power surpasss oven electrical part rated voltage, transmit control chip with the voltage value that sampling circuit obtained through voltage division unit partial pressure, control chip compares through converting it into the digital value and with the standard value based on the rated voltage of electrical part is predetermine, thereby judge that the circuit overvoltage has appeared, control chip output control signal reaches 3 execute circuit, 3 execute circuit controls respectively and goes up heating pipe switch circuit, the power switch disconnection among lower heating pipe switch circuit and the hot-blast switch circuit, thereby the connection of oven electrical part and power has been cut off, thereby the effect of the electrical part of protection oven has been played.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings are included to provide a further understanding of the technical aspects of the present invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the present invention, and together with the description, serve to explain the technical aspects of the present invention.
FIG. 1 is a block diagram of a circuit module according to one embodiment;
fig. 2 is a circuit schematic of an embodiment.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless there is an explicit limitation, the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the terms in the present invention by combining the specific contents of the technical solution.
Referring to fig. 1, a circuit block diagram of an embodiment is shown, and as shown in the figure, a control circuit of this embodiment includes a sampling circuit 100, a switching circuit 200, an execution circuit 300, and a control chip 400. One end of the sampling circuit 100 is connected to the first power supply, and the other end is connected to a sampling channel of the analog-to-digital conversion of the control chip, and the control chip 400 converts the voltage value of the first power supply into a digital value and outputs a control signal according to a comparison result between the converted digital value and the standard value. The switching circuit 200 has one end connected to the first power source and one end connected to the load, and controls the load and the first power source to be turned on and off. The execution circuit 300 is connected to the output terminal of the control chip 400, and the execution circuit 300 receives and responds to the control signal output by the control chip 400. Also shown is a voltage conversion circuit that converts the first power supply to a second power supply required by the execution circuit 300 and a third power supply required by the control chip 400, respectively.
Referring to fig. 2, a schematic circuit diagram of an embodiment is shown, in which a complete schematic circuit diagram is shown, including the sampling circuit 100, the switching circuit 200, the execution circuit 300, and the first power supply. The first power supply is a mains supply, as shown in the figure, ACN1 is a live wire in the mains supply, and ACL1 is a zero wire in the mains supply. A plurality of resistance capacitors are connected in series between the live line ACN1 and the zero line ACL1 of the commercial power to filter the commercial power, and the filtered power is converted into a second power supply and a third power supply through a voltage conversion circuit. The second power supply is a 12V direct current power supply, which is converted by the voltage conversion chip U2 for the first power supply, and is responsible for providing power supply voltage for the execution circuit; the third power supply is formed by converting the second power supply through a voltage conversion chip U1 and is responsible for providing power supply voltage for the control chip.
Referring to fig. 2, a circuit denoted by reference numeral 100 in the figure is a sampling circuit 100, and as shown in the figure, a voltage dividing unit is disposed in the sampling circuit 100 and includes a first voltage dividing device and a second voltage dividing device. The first voltage divider comprises a voltage dividing resistor R3 and a voltage dividing resistor R4, one end of the first voltage dividing resistor is grounded, and the other end of the first voltage dividing resistor is connected with the output end of the sampling circuit; the second voltage divider comprises a voltage dividing resistor R1 and a voltage dividing resistor R2, one end of R1 and R2 is connected with the first power supply, the other end is connected with the output end of the sampling circuit, and the sum of the resistance values of the voltage dividing resistors in the first voltage dividing device and the second voltage dividing device is the ratio of the voltage of the first power supply to the voltage output by the sampling circuit. After the voltage is divided by the voltage dividing resistor, the output voltage value of the sampling circuit is matched with the input voltage range of the analog-digital acquisition channel of the control chip.
As shown in the circuit 100 of fig. 2, the output terminal of the sampling circuit further includes a filter device, and as shown in the figure, the filter device includes a zener diode ZD1, a first capacitor C1, and a second capacitor C2. The zener diode ZD1 plays a role of protecting the circuit when the power voltage is too large, the first capacitor C1 is mainly used for filtering high-frequency noise signals in the circuit, and the second capacitor C2 is used for filtering low-frequency signals.
The circuit 200 in fig. 2 is a switch circuit, and as shown in the figure, a power supply switch REL3 is arranged in the switch circuit 200, the power supply switch REL3 is controlled by a relay in an execution circuit corresponding to the power supply switch REL3, and when the relay is electrified, the power supply switch REL3 is disconnected, so that the connection between a load and a power supply is disconnected.
The circuit designated 300 in fig. 2 is an execution circuit, and as shown, the execution circuit 300 includes a transistor Q3 and an electromagnetic relay. The base of the triode Q3 is connected with the output end of the control chip through the resistor R26, the emitter of the Q3 is grounded, and the collector is connected with the electromagnetic relay. One end of the electromagnetic relay is connected with the collector of the triode Q3, and the other end of the electromagnetic relay is connected with a 12V direct current power supply. The control chip outputs a control signal according to an input value of the sampling circuit, namely a voltage value of the first power supply, when the voltage of the first power supply is greater than the rated voltage of a load, the value obtained by the control chip through the sampling circuit is greater than a standard value, so that the control chip outputs current, the current flows into the base electrode of the triode Q3 after passing through the resistor R26, the base electrode and the collector electrode of the triode Q3 are conducted, the relay is conducted, and magnetic force is generated after the relay is conducted, so that the corresponding power supply switch is controlled to be disconnected; when the voltage of the first power supply is smaller than the rated voltage of the load, the value obtained by the control chip through the sampling circuit is smaller than the standard value, so that the control chip does not output, the base electrode and the collector electrode of the triode are not conducted, and the corresponding power supply switch is kept closed. Namely, the control circuit can realize the following functions: when the voltage exceeds the rated value, the power supply switch is disconnected, and the connection between the load and the power supply is cut off, so that the load connected to the power supply is protected. The execution circuit 300 further comprises a diode, the cathode of the diode is connected with 12V direct current voltage, the anode of the diode is connected between the collector of the triode Q3 and the electromagnetic relay, and the diode can conduct the power supply voltage of the electromagnetic relay at the moment when the triode Q3 is conducted, so that the triode Q3 is protected from being destroyed by reverse voltage at the moment when the triode Q3 is conducted, and the effect of protecting the circuit is achieved.
As shown in fig. 2, the number of the switching circuits and the execution circuits in the circuit is plural, and the plural switching circuits and the execution circuits correspond to each other one by one. The figure has 3 groups of switch circuits and execution circuits, wherein the loads of the 3 switch circuits are respectively connected with a hot air module, an upper heating pipe module and a lower heating pipe module of the oven. When the voltage of the first power supply exceeds the rated voltage of the load, the control chip controls the 3 execution circuits to disconnect the power supply switches of the corresponding switch circuits, so that the function of overvoltage protection is achieved.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (10)
1. A control circuit, comprising:
the switching circuit is provided with a power supply switch, and the power supply switch is electrically connected between a first power supply and a load;
the sampling circuit is provided with a voltage division unit, the voltage division unit is electrically connected between the first power supply and the ground, the voltage division unit comprises a first voltage division device, one end of the first voltage division device is electrically connected with the ground, and the other end of the first voltage division device is led out of the output end of the sampling circuit;
the sampling channel of the analog-to-digital conversion of the control chip is connected to the output end of the sampling circuit;
and the execution circuit is connected with the control chip and used for receiving the control signal of the control chip and responding and controlling the power supply switch to be switched on and off based on the control signal.
2. The control circuit of claim 1, wherein: the number of the switch circuits and the number of the execution circuits are both multiple, and the switch circuits correspond to the execution circuits one to one; and all the execution circuits receive the control signal of the control chip and control the power supply switch corresponding to the execution circuit to be switched on and switched off.
3. The control circuit of claim 1, wherein: the control circuit further comprises a voltage conversion circuit, the first power supply serves as a second power supply and a third power supply which are converted by the input of the voltage conversion circuit, the first power supply is a mains supply, the second power supply is a 12v direct-current power supply, the third power supply is a 5v direct-current power supply, and the third power supply is used for supplying power to the control chip.
4. The control circuit of claim 3, wherein: the execution circuit comprises a relay and a triode, the relay controls the power supply switch to be switched on and switched off through magnetic force, the relay is electrically connected between the second power supply and the triode, and the triode is electrically connected to an output pin of the control chip and receives a control signal of the control chip.
5. The control circuit of claim 4, wherein: the base electrode of the triode is connected to the output pin of the control chip through a resistor, the emitting electrode of the triode is grounded, the control signal controls the conduction of the base electrode and the collecting electrode of the triode, and when the triode is conducted, the relay generates magnetic force to control the power supply switch to be switched off.
6. The control circuit of claim 4, wherein: the execution circuit further comprises a diode, wherein the anode of the diode is electrically connected to the collector of the triode, the cathode of the diode is connected to the second power supply, and the diode prevents reverse voltage from puncturing the triode at the moment of conducting the triode and is used for protecting the triode.
7. The control circuit of claim 1, wherein: the voltage division unit further comprises a second voltage division device, and the second voltage division device is electrically connected between the first power supply and the output end of the sampling circuit.
8. The control circuit of claim 1, wherein: the sampling circuit further comprises a filter device, and the filter device is electrically connected between the output end of the sampling circuit and the ground.
9. The control circuit of claim 8, wherein: the filter device comprises a voltage regulator tube, a first capacitor and a second capacitor, wherein the first capacitor is used for filtering high-frequency signals, and the second capacitor is used for filtering low-frequency signals.
10. An oven, characterized in that it comprises an upper heating tube module, a lower heating tube module, a hot air module and a control circuit according to any one of claims 1 to 9, said upper heating tube module, lower heating tube module and hot air module being connected as loads of a switching circuit, respectively, in said switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221327416.0U CN217467509U (en) | 2022-05-30 | 2022-05-30 | Control circuit and oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221327416.0U CN217467509U (en) | 2022-05-30 | 2022-05-30 | Control circuit and oven |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217467509U true CN217467509U (en) | 2022-09-20 |
Family
ID=83277810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221327416.0U Active CN217467509U (en) | 2022-05-30 | 2022-05-30 | Control circuit and oven |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217467509U (en) |
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2022
- 2022-05-30 CN CN202221327416.0U patent/CN217467509U/en active Active
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