CN215914240U

CN215914240U - Control circuit of toaster

Info

Publication number: CN215914240U
Application number: CN202122407378.1U
Authority: CN
Inventors: 冼丽琼
Original assignee: Foshan City Shunde District Hengling Electrical Appliance Co ltd
Current assignee: Foshan City Shunde District Hengling Electrical Appliance Co ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2022-03-01
Anticipated expiration: 2031-09-30

Abstract

The utility model relates to a control circuit of a toaster, which comprises a microprocessor IC1, a triode Q2 and an electromagnet LE1, wherein a working power supply is connected with a collector of the triode Q2 after passing through the electromagnet LE1, an emitter of the triode Q2 is grounded to form a loop, a control signal output by the microprocessor IC1 is connected with a base of the triode Q2, the control circuit also comprises a timer IC2 and a triode Q1, the triode Q1 is arranged between the electromagnet LE1 and the triode Q2, the collector of the triode Q1 is connected with the working power supply through the electromagnet LE1, the emitter of the triode Q1 is connected with the collector of the triode Q2, the output end of the timer IC2 is connected with the base of the triode Q1, and the output end of the timer IC2 outputs a low level when the timer runs out. In the utility model, a triode controlled by a timer is added, when the triode Q2 can not be controlled to be disconnected when the microprocessor is damaged, the timer generates a low level signal to control the triode Q1 to be disconnected as long as the timing is reached. And the current in the electromagnet is cut off, so that the duplex switch TS _1 is disconnected, and the safety is ensured.

Description

Control circuit of toaster

Technical Field

The utility model relates to the field of control circuits, in particular to a toaster control circuit.

Background

At present, a control circuit of a toaster is shown in fig. 1, after normal electrification, an electromagnet attracts a furnace double-link switch TS _1, and a furnace body heats and works. At the moment, the microprocessor IC1 outputs a disconnection signal according to the setting on the toaster panel, after the time is up, the IC1 outputs a disconnection signal, the triode Q2 disconnects the electromagnet, the electromagnet loses the suction force, the oven liner switch is loosened, the live wire and the zero line are cut off, and the baked bread is bounced along with the rise and fall of the oven liner.

The method is characterized in that a MCU chip commonly used for household appliances is used for controlling a duplex switch TS _1, the MCU chip adopts a processor with the model number of SN8P2501B _ SOP8, when the toaster needs to be powered off, the MCU chip processor generates a low-voltage signal to disconnect a triode Q2, the current flowing through an electromagnet LE1 is cut off, the electromagnet LE1 is powered off, magnetic attraction is avoided, and the duplex switch TS _1 cuts off the power supply of the toaster.

At present, when a user uses the toaster, the problem that if the microprocessor chip IC1 is damaged or the transistor Q2 is damaged, the situation can never be broken, so that the glue is melted at high temperature and serious fire is caused exists.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the control circuit of the existing toaster, the utility model provides the control circuit of the toaster.

The technical scheme adopted by the utility model for realizing the technical purpose is as follows: a control circuit of a toaster comprises a microprocessor IC1, a triode Q2, an electromagnet LE1, a timer IC2 and a triode Q1, wherein a working power supply is connected with a collector of the triode Q2 after passing through the electromagnet LE1, an emitter of the triode Q2 is grounded to form a loop, a control signal output by the microprocessor IC1 is connected with a base of the triode Q2, the timer IC1 is arranged between the electromagnet LE1 and the triode Q2, the collector of the triode Q1 is connected with the working power supply through the electromagnet LE1, the emitter of the triode Q1 is connected with a collector of the triode Q2, an output end of the timer IC2 is connected with a base of the triode Q1, and an output end of the timer IC2 outputs a low level when timing.

Further, in the control circuit of the toaster described above: the oven core of the toaster comprises a heating wire L1 and a heating wire L2, two ends of the heating wire L2 are respectively connected with a duplex switch TS _1 and the ground, one end of the heating wire L2 is connected with the duplex switch TS _1, the other end of the heating wire L2 is grounded through a relay JQ1, one end of a coil of the relay JQ1JQ1 is connected with a working power supply, and the other end of the coil is grounded through a ping-pong switch KEY 1.

Further, in the control circuit of the toaster described above: the indicating lamp circuit comprises a light emitting diode LED2 and a current limiting resistor R7, a working power supply is connected with the anode of the light emitting diode LED2 through a resistor R7, and the cathode of the light emitting diode LED2 is connected with the working power supply through a coil of a relay JQ 1.

Further, in the control circuit of the toaster described above: the working power supply takes electricity from the furnace core and comprises a rectifier diode D3 and an electrolytic capacitor C1, a lead is led out from the furnace core of the toaster and is connected with the anode of the rectifier diode D3, the cathode of the rectifier diode D3 is connected with the anode of the electrolytic capacitor C1, the cathode of the electrolytic capacitor C1 is grounded, and the anode of the electrolytic capacitor C1 outputs working voltage of 12 VDC.

In the utility model, a triode controlled by a timer is added, when the triode Q2 can not be controlled to be disconnected when the microprocessor is damaged, the timer generates a low level signal to control the triode Q1 to be disconnected as long as the timing is reached. And the current in the electromagnet is cut off, so that the duplex switch TS _1 is disconnected, and the safety is ensured.

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Drawings

FIG. 1 is a control circuit of a current toaster;

fig. 2 is a toaster control circuit according to an embodiment of the present invention.

Detailed Description

Embodiment 1, as shown in fig. 2, this embodiment is a control circuit of a toaster with safety protection, in which a transistor Q1 controlled by a timer is connected in series to a transistor Q2 controlled by a microprocessor, and in actual operation, when any one of the transistor Q2 and the transistor Q1 is turned off, the current flowing through an electromagnet LE1 is cut off, so that the electromagnet LE1 loses magnetic force, a furnace duplex switch TS _1 is turned off, and the power supply of the toaster is cut off. In this embodiment, the microprocessor IC1 uses model number SN8P2501BS0P8, and the chip used for the timer is a 0201F. In this embodiment, a switch CANCL is further provided on the operation panel of the toaster, and the base voltage of the transistor Q2 can be directly pulled down from the operation panel by the switch, so that the transistor Q2 is turned off, that is, the current in the electromagnet LE1 is cut off, and the furnace dual switch TS _1 is turned off.

As shown in fig. 2, in this embodiment, the control circuit of the toaster includes a microprocessor IC1, a timer, a transistor Q2, a transistor Q1, and an electromagnet LE1, wherein the working power source passes through the electromagnet LE1 and then is sequentially connected to the collector of the transistor Q1, the emitter of the transistor Q1, the collector of the transistor Q2, and the emitter of the transistor Q2 are grounded to form a loop, the base of the transistor Q2 is controlled by the control signal generated by the microprocessor IC1, the base of the transistor Q1 is controlled by the control signal generated by the timer, the transistor Q1 and the transistor Q2 are both NPN transistors, the control signal generated by the microprocessor IC1 and the control signal generated by the timer are both active at low level, and the output is high level when the control signal is inactive, so that when the control signal is not generated, that is, the time is not up, the control signal pin outputs corresponding to the microprocessor and the timer are both at high level, thus, transistor Q1 and transistor Q2 are both conducting, and current flows through solenoid LE1, which generates an attractive force (magnetic force) to close the furnace duplex switch TS _ 1.

In this embodiment, the parameters of the microprocessor and the parameters of the timer are input when the toaster is operated by the toaster operation panel.

In this embodiment, the oven core of the toaster includes a heating wire L1 and a heating wire L2, two ends of the heating wire L1 are respectively connected to the duplex switch TS _1 and the ground, one end of the heating wire L2 is connected to the duplex switch TS _1, the other end is grounded through a relay JQ1, one end of a coil of the relay JQ1 is connected to a working power supply, and the other end is grounded through a toggle switch KEY 1. The two parts of heating wires can only use one part of heating wires when working, the heating wire L2 is controlled by a relay J01, and the heating wire L1 heating indicating lamp circuit also comprises an indicating lamp circuit, the indicating lamp circuit comprises a light emitting diode LED2 and a current limiting resistor R7, a working power supply is connected with the anode of a light emitting diode LED2 after passing through a resistor R7, and the cathode of the light emitting diode LED2 is connected with a coil of a relay JQ1 and is connected with the working power supply. When the relay J01 is closed after the heating wire L2 presses the ping-pong switch KEY1, the heating wire L2 is disconnected with the ground, so that the heating wire L2 cannot form a loop, and therefore, the heating wire does not generate heat, and the light emitting diode LED2 is shiny at the moment, which shows that only the heating wire L1 works.

In this embodiment, the working power supply takes power from the furnace core, because the furnace core is composed of two heating wires, the heating wire L2 may not heat at some time, as long as the furnace bladder duplex switch TS _1 is closed, the heating wire L1 will have electricity, we know that the heating wire itself is wound by a resistance wire, and the voltage on the heating wire decreases step by step, therefore, the power can be taken from the heating wire L1 to form the working voltage for the control circuit according to the actual situation, the working voltage circuit includes a rectifier diode D3 and an electrolytic capacitor C1, a lead is led out from the furnace core of the toaster to be connected with the anode of a rectifier diode D3, the cathode of the rectifier diode D3 is connected with the anode of an electrolytic capacitor C1, the cathode of the electrolytic capacitor C1 is grounded, and the anode of the electrolytic capacitor C1 outputs the working voltage of 12 VDC.

Claims

1. A control circuit of toaster, including microprocessor IC1, triode Q2, electromagnet LE1, the working power supply connects the collector of triode Q2 after electromagnet LE1, the emitter of triode Q2 is grounded to form the return circuit, the control signal that microprocessor IC1 outputs connects the base of triode Q2, characterized by that: the timing device also comprises a timer IC2 and a triode Q1, wherein the triode Q1 is arranged between the electromagnet LE1 and the triode Q2, the collector of the triode Q1 is connected with a working power supply through the electromagnet LE1, the emitter of the triode Q1 is connected with the collector of the triode Q2, the output end of the timer IC2 is connected with the base of the triode Q1, and the output end of the timer IC2 outputs low level when timing is over.

2. The control circuit of a toaster as claimed in claim 1, wherein: the oven core of the toaster comprises a heating wire L1 and a heating wire L2, two ends of the heating wire L1 are respectively connected with a duplex switch TS _1 and the ground, one end of the heating wire L2 is connected with the duplex switch TS _1, the other end of the heating wire L2 is grounded through a relay JQ1, one end of a coil of the relay JQ1 is connected with a working power supply, and the other end of the coil is grounded through a ping-pong switch KEY 1.

3. The control circuit of a toaster as claimed in claim 2, wherein: the indicating lamp circuit comprises a light emitting diode LED2 and a current limiting resistor R7, a working power supply is connected with the anode of the light emitting diode LED2 through a resistor R7, and the cathode of the light emitting diode LED2 is connected with the working power supply through a coil of a relay JQ 1.

4. The control circuit of a toaster as claimed in claim 1, 2 or 3, wherein: the working power supply takes electricity from the furnace core and comprises a rectifier diode D3 and an electrolytic capacitor C1, a lead is led out from the furnace core of the toaster and is connected with the anode of the rectifier diode D3, the cathode of the rectifier diode D3 is connected with the anode of the electrolytic capacitor C1, the cathode of the electrolytic capacitor C1 is grounded, and the anode of the electrolytic capacitor C1 outputs working voltage of 12 VDC.