CN201054797Y - Microcomputer load control circuit - Google Patents

Abstract

The utility model relates to a microcomputer load control circuit, including load circuit A and control circuit B, two circuits pass through radio connector and connect, and load circuit A is provided with heating tube (21) and temperature sensing circuit, and above-mentioned control circuit B of its characterized in that includes at least one relay circuit, and load circuit A's live wire and zero line pass through radio connector and are connected with relay circuit's live wire and zero line's output, and relay circuit's live wire and zero line are connected with the live wire and the zero line of power supply circuit (11) respectively. The utility model discloses because control circuit includes at least one relay circuit, load circuit's live wire and zero line pass through the radio connector and are connected with relay circuit's live wire and zero line's output, relay circuit's live wire and zero line are connected with power supply circuit's live wire and zero line respectively, when liquid heating device's kettle body main part left the base, the disconnection of relay circuit, radio connector's live wire and zero line and power supply circuit's connection were broken off, radio connector live wire or zero line contact do not take any commercial power charge, when the user touched radio connector live wire or zero line contact, can not electrocute, therefore, the utility model relates to a safe and reliable's microcomputer load control circuit.

Description

Microcomputer load control circuit

technical field

The utility model relates to a microcomputer load control circuit, in particular to a microcomputer load control circuit of a liquid heating device.

Background technique

In the prior art, commercially available liquid heating devices, such as electric kettles, coffee pots, electric irons, microcomputer load control circuits, include a load circuit and a control circuit, and the two circuits are connected by a 360-degree freely rotating radio connector, and the load circuit is provided with The heating tube and temperature sensing circuit, the control circuit is equipped with a conversion circuit module that converts AC power into DC power, and the 360-degree free-rotating electrical connector is generally equipped with live wire contacts and neutral wire contacts. The above live wire and neutral wire contacts are directly connected to the market. Electric power connection, that is, the strong electric contacts in the electric connector are directly connected to the mains power supply. Therefore, the contacts in the electric connector still retain strong electricity. Once the user touches it, it is extremely unsafe. In addition, although in the safety standard It is required that the groove width of the connector must be less than or equal to 3mm, but these contacts may still be touched.

Utility model content

The purpose of the utility model is to provide a safe and reliable microcomputer load control circuit to overcome the deficiencies in the prior art.

A microcomputer load control circuit designed for this purpose includes a load circuit A and a control circuit B, and the two circuits are connected through a radio connector. The load circuit A is provided with a heating tube and a temperature sensing circuit, and it is characterized in that the control circuit B includes at least A relay circuit, the live wire and the neutral wire of the load circuit A are connected to the output terminals of the live wire and the neutral wire of the relay circuit through the radio connector, and the live wire and the neutral wire of the relay circuit are respectively connected to the live wire and the neutral wire of the power supply circuit.

The above-mentioned radio connector is composed of an upper connector and a lower connector.

The above relay circuit is a single pole double throw relay.

The above control circuit also includes a step-down rectification circuit, a voltage stabilizing circuit, a central control unit, and a sensor circuit. The 220V AC is transformed into +12V after passing through the step-down rectification circuit, which is respectively supplied to the voltage stabilizing circuit and the SPDT relay. The central control unit It is electrically connected with the voltage stabilizing circuit, and the sensor circuit and the single-pole double-throw relay are respectively connected with the central control unit and the lower connector.

The above relay circuit is two SPST relays.

The above-mentioned control circuit also includes a step-down rectification circuit, a voltage stabilizing circuit, a central control unit, and a sensor circuit. The 220V alternating current is transformed into +12V after passing through the step-down rectifying circuit, which is respectively supplied to the voltage stabilizing circuit, the first single-pole single-throw relay and the second Two single-pole single-throw relays, the central control unit is electrically connected to the voltage stabilizing circuit, the sensor circuit, the first single-pole single-throw relay and the second single-pole single-throw relay are respectively electrically connected to the central control unit, the sensor circuit is electrically connected to the lower connector Connection, the first SPST relay is connected to the live wire of the lower connector, the second SPST relay is connected to the neutral pole of the lower connector, the live wire of the first SPST relay and the second SPST The neutral wire of the type relay is connected to the live wire and the neutral wire of the power circuit respectively.

The above SPST relay includes relay switch K1, diode D1, triode Q1 and resistor R1, the electrical switch K1, diode D1, triode Q1 are connected in parallel and then connected in series with R1, the other end of R1 is connected to the central control unit, and the electrical switch K1 has two Terminals are respectively connected to the zero line of the power circuit and the zero line of the lower connector; the above-mentioned single-pole single-throw relay includes a relay switch K2, a diode D2, a transistor Q2 and a resistor R2, and the relay switch K2, diode D2, and transistor Q2 are connected in parallel with R2 In series, the other end of the resistor R2 is connected to the central control unit, and the two ends of the electrical switch K2 are respectively connected to the live wire of the power circuit and the live wire of the lower connector.

In the utility model, since the control circuit includes at least one relay circuit, the live wire and the neutral wire of the load circuit are connected with the output ends of the live wire and the neutral wire of the relay circuit through a radio connector, and the live wire and the neutral wire of the relay circuit are respectively connected with the live wire and the neutral wire of the power supply circuit. Neutral connection, when the main body of the liquid heating device leaves the base, the relay circuit is disconnected, the connection between the live wire and neutral wire of the radio connector and the power circuit is disconnected, and the live wire or neutral wire contact of the radio connector does not carry any Mains charge, when the user touches the live wire or neutral wire contact of the radio connector, he will not get an electric shock. Therefore, the utility model is a safe and reliable microcomputer load control circuit.

Description of drawings

Fig. 1 is a circuit connection block diagram of an embodiment of the utility model.

Fig. 2 is a circuit connection block diagram of the second embodiment of the utility model.

FIG. 3 is a schematic diagram of the circuit connection in FIG. 2 .

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

Example 1:

Referring to Fig. 1, it is an embodiment that the utility model is applied to an electric kettle. The microcomputer load control circuit includes a load circuit A and a control circuit B. The two circuits are connected through a radio connector. The load circuit is provided with a heating tube 21 and a temperature sensing circuit. The wires are connected to the output ends of the live wire and the neutral wire of the relay circuit through the radio connector, and the live wire and the neutral wire of the relay circuit are respectively connected with the live wire and the neutral wire of the power supply circuit 11. The above-mentioned wireless connector is composed of an upper connector 2 and a lower connector 1, the upper connector 2 and the load circuit A are arranged on the body of the pot, and the control circuit B and the lower connector 1 are arranged on the base. The above-mentioned relay circuit is a single-pole double-throw relay 16 . The control circuit B also includes a step-down rectification circuit 12, a voltage stabilizing circuit 13, a central control unit 14, and a sensor circuit 15. The 220V alternating current is converted into direct current through the step-down rectifying circuit 12, and is respectively supplied to the voltage stabilizing circuit 13 and the SPDT relay. 16. The central control unit 14 is electrically connected to the voltage stabilizing circuit, and the sensor circuit 15 and the SPDT relay 16 are respectively connected to the central control unit and the lower connector 1 electrically.

When the utility model works, the temperature sensing circuit transmits the temperature signal in the pot body to the sensor circuit 15 through the upper and lower connectors, and the central control unit 14 converts the signal of the sensor circuit 15 into an identifiable signal, Then the output information is fed back to the SPDT relay 16, and the relay 16 is connected and disconnected according to the signal. Since the radio connector is divided into an upper connector 2 and a lower connector 1, when the main body of the pot leaves the base, the power on and off The connector is disconnected, the connection of the sensor circuit is disconnected, the central control unit 14 sends a signal to the relay 16, and the relay 16 is disconnected, so that the live wire pole and the neutral wire pole in the power down connector 1 are disconnected, and the live wire of the radio connector Or the neutral contact does not carry any mains charge, and the user will not get an electric shock when touching the live or neutral contact of the radio connector.

Example 2:

Referring to Fig. 2, it is an embodiment that the utility model is applied to an electric kettle. Wherein, the above-mentioned relay circuit is two single-pole single-throw relays 17 and 18 . The above-mentioned control circuit also includes a step-down rectification circuit 12, a voltage stabilizing circuit 13, a central control unit 14, and a sensor circuit 15. The 220V alternating current is converted into direct current through the step-down rectifying circuit 12 and then supplied to the stabilizing circuit 13, the first single-pole single-throw type The relay 17 and the second SPST relay 18 are electrically connected to the central control unit 14 with the voltage stabilizing circuit, and the sensor circuit 15, the first SPST relay 17 and the second SPST relay 18 are electrically connected to the central control unit respectively. connection, the sensor circuit is electrically connected to the lower connector 1, the first SPST relay 17 is connected to the live pole of the lower connector 1, the second SPST relay 18 is connected to the neutral pole of the lower connector 1, and the second SPST relay 18 is connected to the neutral pole of the lower connector 1. The live wire of one SPST relay 17 and the neutral wire of the second SPST relay 18 are respectively connected to the live wire and neutral wire of the power supply circuit 11 .

Referring to Fig. 3, the above-mentioned SPST relay 17 includes a relay switch K1, a diode D1, a triode Q1 and a resistor R1, the electrical switch K1, the diode D1, and the triode Q1 are connected in parallel and connected in series with R1, and the other end of R1 is connected to the central control unit 14 connection, the two ends of the electrical switch K1 are respectively connected to the zero line of the power supply circuit 11 and the zero line of the lower connector 1; the above-mentioned SPST relay 18 includes a relay switch K2, a diode D2, a triode Q2 and a resistor R2, a relay switch K2, Diode D2 and transistor Q2 are connected in parallel and connected in series with R2. The other end of resistor R2 is connected to central control unit 14. The input power is connected to the filter capacitors C1 and C2 after being stepped down by the transformer, and the +12V voltage is output to the SPST relay 17, the SPST relay 18 and the voltage regulator, and the +12V voltage is stabilized by the voltage regulator and connected to the capacitor Connect C3 and C4, output +5V voltage to the central control unit, and connect the thermistor of the temperature sensor circuit to the central control unit. Other electrical connections are the same as in Embodiment 1.

Claims (7)

1. A microcomputer load control circuit, comprising load circuit A and control circuit B, two circuits are connected by a radio connector, load circuit A is provided with heating tube (21) and temperature sensing circuit, it is characterized in that above-mentioned control circuit B comprises at least In a relay circuit, the live wire and the neutral wire of the load circuit A are connected to the output terminals of the live wire and the neutral wire of the relay circuit through the radio connector, and the live wire and the neutral wire of the relay circuit are respectively connected to the live wire and the neutral wire of the power supply circuit (11). 2. The microcomputer load control circuit according to claim 1, characterized in that said wireless connector is composed of an upper connector (2) and a lower connector (1). 3. The microcomputer load control circuit according to claim 2, characterized in that the above-mentioned relay circuit is a single-pole double-throw relay (16). 4. according to the described microcomputer load control circuit of claim 3, it is characterized in that above-mentioned control circuit also comprises step-down rectification circuit (12), voltage stabilizing circuit (13), central control unit (14), sensor circuit (15) , the 220V alternating current is transformed into +12V after passing through the step-down rectifier circuit (12), and is supplied to the voltage stabilizing circuit (13) and the SPDT relay (16) respectively, the central control unit (14) is electrically connected with the voltage stabilizing circuit, and the sensor The circuit (15) and the SPDT relay (16) are respectively connected to the central control unit and electrically connected to the lower connector (1). 5. The microcomputer load control circuit according to claim 2, characterized in that the above-mentioned relay circuit is two single-pole single-throw relays (17), (18). 6. according to the described microcomputer load control circuit of claim 5, it is characterized in that above-mentioned control circuit also comprises step-down rectification circuit (12), voltage stabilizing circuit (13), central control unit (14), sensor circuit (15) , the 220V AC is transformed into +12V after passing through the step-down rectifier circuit (12), and is respectively supplied to the voltage stabilizing circuit (13), the first SPST relay (17) and the second SPST relay (18), and the center The control unit (14) is electrically connected to the voltage stabilizing circuit, the sensor circuit (15), the first SPST relay (17) and the second SPST relay (18) are respectively electrically connected to the central control unit, and the sensor circuit and The lower connector (1) is electrically connected, the first SPST relay (17) is connected to the live wire pole of the lower connector (1), and the second SPST relay (18) is connected to the zero pole of the lower connector (1). The line poles are connected, the live wire of the first SPST relay (17) and the neutral wire of the second SPST relay (18) are respectively connected with the live wire and the neutral wire of the power supply circuit (11). 7. according to the described microcomputer load control circuit of claim 6, it is characterized in that above-mentioned SPST relay (17) comprises relay switch K1, diode D1, triode Q1 and resistor R1, electrical switch K1, diode D1, triode After Q1 is connected in parallel, it is connected in series with R1, the other end of R1 is connected with the central control unit (14), and the two ends of the electrical switch K1 are respectively connected with the zero line of the power supply circuit (11) and the zero line of the lower connector (1); Throwing relay (18) comprises relay switch K2, diode D2, triode Q2 and resistance R2, and relay switch K2, diode D2, triode Q2 are connected in parallel with R2 in series, and the other end of resistance R2 is connected with central control unit (14). Both ends of the switch K2 are respectively connected with the live wire of the power supply circuit (11) and the live wire of the lower connector (1).

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