Switch control circuit and air conditioner illumination control device using same

Abstract

The utility model discloses a switch control circuit and an air conditioner illumination control device using the same, and the circuit comprises an AC phase shift circuit which is used for carrying out AC sine wave phase shift when a switch is turned on / off; the zero-crossing detection and pulse generation circuit is connected to the alternating-current phase shift circuit and is used for detecting an input zero-crossing point and generating a rectangular pulse; the pulse trigger circuit is connected to the zero-cross detection and pulse generation circuit and is used for receiving and responding to the rectangular pulse and the control input signal and triggering control output; and the relay driving circuit is connected to the output side of the pulse trigger circuit and is used for executing the on-off action of the functional circuit. The control effect of the function switch of the intelligent air conditioner can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of intelligent air conditioners, and in particular to a switch control circuit and an air conditioner lighting control device using the same. Background Art

[0002] At present, the on / off control of various functions of smart air conditioners, for example, the on / off control of lighting functions can be carried out by using a relay switch control circuit.

[0003] However, the relay switch control circuit uses a single-chip microcomputer to directly control the on and off of the relay, and is unable to distinguish the opening and closing timing of the relay contacts, which is relatively easy to cause relay contact burning and adhesion. Therefore, the present application proposes a new technical solution. Utility Model Content

[0004] In order to improve the control effect of the functional switch of an intelligent air conditioner, the present application provides a switch control circuit and an air conditioner lighting control device using the same.

[0005] In a first aspect, the present application provides a switch control circuit, which adopts the following technical solution:

[0006] A switch control circuit, comprising:

[0007] AC phase shifting circuit, which is used to perform AC sine wave phase shifting when the switch is turned on / off;

[0008] A zero-crossing detection and pulse generating circuit, which is connected to the AC phase shift circuit and is used to detect the input zero-crossing point and generate a rectangular pulse;

[0009] A pulse trigger circuit is connected to the zero-crossing detection and pulse generation circuit and is used to receive and respond to the rectangular pulse and the control input signal to trigger the control output;

[0010] The relay driving circuit is connected to the output side of the pulse trigger circuit and is used to perform the on-off action of the functional circuit.

[0011] Optionally, the AC phase shift circuit includes a capacitor C1 and a resistor R1 connected in series, the other end of the capacitor C1 is used to connect to the live wire L of the AC power, and the other end of the resistor R1 is used to connect to the zero wire N of the AC power and to connect to the input side of the zero detection and pulse generation circuit;

[0012] The input side of the zero-crossing detection and pulse generation circuit is also connected between the capacitor C1 and the resistor R1.

[0013] Optionally, the zero-crossing detection and pulse generation circuit includes an optical coupler U1, a second resistor R2 and a third resistor R3, one end of the input side of the optical coupler U1 is connected between the capacitor C1 and the first resistor R1, and the other end is connected to the resistor R1 and connected to one end of the AC zero line N;

[0014] Pin 3 of the output side of the optocoupler U1 is connected to resistor R2, and the other end of resistor R2 is connected to GND; one end of resistor R3 is connected between pin 3 of the optocoupler U1 and resistor R2, and the other end is used for pulse output.

[0015] Optionally, the pulse trigger circuit includes a trigger unit composed of multiple positive edge triggered D-type flip-flops sharing a clock, the output end of the zero crossing detection and pulse generation circuit is connected to the CLK pin of the trigger unit, and any output pin of the trigger unit is connected to the relay drive circuit.

[0016] Optionally, the relay drive circuit includes:

[0017] MOS tube Q1, its G pin is connected in series with resistor R4 and then connected to the output end of the pulse trigger circuit, and its S pin is connected to GND;

[0018] Relay K1, one end of its coil is connected to the power supply VCC, the other end is connected to the D pin of MOS tube Q1, and its normally open contact is connected in series with the functional circuit;

[0019] The diode D1 is arranged in parallel with the coil of the relay K1.

[0020] In a second aspect, the present application provides an air conditioning lighting control device, which adopts the following technical solution:

[0021] An air-conditioning lighting control device comprises a lamp group used for air-conditioning lighting and the switch control circuit as described above, wherein the contact of the relay K1 of the switch control circuit is connected in series to the power supply circuit of the lamp group.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: not only is it compatible with traditional control methods, but also during the execution of the switch action, if it is turned on, it will first shift the phase of the AC sine wave forward, then detect the zero point of the sine wave after the phase shift, generate a rectangular pulse, trigger the control output, and then drive the relay;

[0023] Compared with the prior art, the opening and closing of the relay in this application is no longer random, but occurs during the zero-crossing stage of the alternating current. Therefore, the amplitude of the relay contact action is smaller and the impact current is smaller. Therefore, the relay is relatively less prone to burning and adhesion. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is the circuit schematic diagram of this application. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1 This application is described in further detail.

[0026] An embodiment of the present application discloses a switch control circuit.

[0027] Reference Figure 1 The switch control circuit includes: an AC phase shift circuit, a zero-crossing detection and pulse generation circuit, a pulse trigger circuit and a relay drive circuit.

[0028] Among them, the AC phase shift circuit includes a capacitor C1 and a resistor R1 connected in series, the other end of the capacitor C1 is used to connect the live wire L of the AC power; the other end of the resistor R1 is used to connect the zero wire N of the AC power and is used to connect the input side of the zero-crossing detection and pulse generation circuit; the input side of the zero-crossing detection and pulse generation circuit is also connected between the capacitor C1 and the resistor R1.

[0029] Taking 220V AC as an example, the above-mentioned resistor R1 and capacitor C1 form an RC phase shift circuit.

[0030] In the present application, the zero-crossing detection and pulse generation circuit includes an optocoupler U1, a resistor R2 and a resistor R3, one end of the input side of the optocoupler U1 is connected between the capacitor C1 and the resistor R1, and the other end is connected to the resistor R1 and connected to one end of the AC zero line N;

[0031] Pin 3 of the output side of the optocoupler U1 is connected to resistor R2, and the other end of resistor R2 is connected to GND; one end of resistor R3 is connected between pin 3 of the optocoupler U1 and resistor R2, and the other end is used for pulse output.

[0032] According to the above configuration, on the one hand, the optocoupler U1 is used to isolate the AC power, and on the other hand, the characteristics of the optocoupler U1 can be used in conjunction with the aforementioned AC phase shift circuit configuration to detect the zero crossing point of the sine wave. At the same time, due to the intermittent conduction of the optocoupler U1, a rectangular pulse is generated.

[0033] In one embodiment of the present application, the pulse trigger circuit includes a trigger unit composed of a plurality of positive edge triggered D-type flip-flops sharing a clock, and when there are 6 clocks, it is, for example: SNx4HC174 flip-flop.

[0034] The output end of the zero-crossing detection and pulse generation circuit is connected to the CLK pin of the trigger unit, that is, the resistor R3 is connected to the CLK pin, and any output pin of the trigger unit is connected to the relay drive circuit.

[0035] The trigger unit is as follows Figure 1 As shown, its pin 3 is connected in series with resistor R5 and serves as a control port; pin 2 serves as an output port.

[0036] In one embodiment of the present application, the relay driving circuit includes:

[0037] MOS tube Q1, its G pin is connected in series with resistor R4 and then connected to the output end of the pulse trigger circuit, and its S pin is connected to GND;

[0038] Relay K1, one end of its coil is connected to the power supply VCC, the other end is connected to the D pin of MOS tube Q1, and its normally open contact is connected in series with the functional circuit;

[0039] The diode D1 is arranged in parallel with the coil of the relay K1.

[0040] Based on the above, it can be seen that the present application is not only compatible with traditional control methods, but also can realize output control of all trigger units with only one control port, thereby realizing switch control of multiple functional circuits at one time.

[0041] Compared with the existing thyristor switch control circuit, the present application has the effects of low heat generation and anti-interference and false triggering; and compared with the existing relay and thyristor composite switch control circuit, because it is no longer necessary to add a thyristor and a thyristor driving optocoupler for each output, the cost is relatively lower.

[0042] The embodiment of the present application discloses an air-conditioning lighting control device.

[0043] The air conditioning lighting control device comprises a lamp group applied to air conditioning lighting and the switch control circuit as described above, wherein the contact of the relay K1 of the switch control circuit is connected in series to the power supply circuit of the lamp group.

[0044] It can be understood that, in addition to the light group used for air conditioning lighting, the opening and closing of other functions of the air conditioner can also be controlled by the above-mentioned switch control circuit.

[0045] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A switch control circuit, characterized in that: AC phase shifting circuit, which is used to perform AC sine wave phase shifting when the switch is turned on / off; A zero-crossing detection and pulse generating circuit, which is connected to the AC phase shift circuit and is used to detect the input zero-crossing point and generate a rectangular pulse; A pulse trigger circuit is connected to the zero-crossing detection and pulse generation circuit and is used to receive and respond to the rectangular pulse and the control input signal to trigger the control output; The relay driving circuit is connected to the output side of the pulse trigger circuit and is used to perform the on-off action of the functional circuit.

2. The switch control circuit according to claim 1, characterized in that: The AC phase shift circuit includes a capacitor C1 and a resistor R1 connected in series, the other end of the capacitor C1 is used to connect to the live wire L of the AC power, and the other end of the resistor R1 is used to connect to the zero wire N of the AC power and to connect to the input side of the zero detection and pulse generation circuit; The input side of the zero-crossing detection and pulse generation circuit is also connected between the capacitor C1 and the resistor R1.

3. The switch control circuit according to claim 2, characterized in that: The zero-crossing detection and pulse generation circuit comprises an optocoupler U1, a resistor R2 and a resistor R3, one end of the input side of the optocoupler U1 is connected between the capacitor C1 and the resistor R1, and the other end is connected to the resistor R1 and connected to one end of the AC zero line N; Pin 3 of the output side of the optocoupler U1 is connected to resistor R2, and the other end of resistor R2 is connected to GND; one end of resistor R3 is connected between pin 3 of the optocoupler U1 and resistor R2, and the other end is used for pulse output.

4. The switch control circuit according to claim 1 or 3, characterized in that: The pulse trigger circuit includes a trigger unit composed of a plurality of positive edge triggered D-type flip-flops sharing a clock, the output end of the zero crossing detection and pulse generation circuit is connected to the CLK pin of the trigger unit, and any output pin of the trigger unit is connected to the relay drive circuit.

5. The switch control circuit according to claim 1, characterized in that: The relay drive circuit comprises: MOS tube Q1, its G pin is connected in series with resistor R4 and then connected to the output end of the pulse trigger circuit, and its S pin is connected to GND; Relay K1, one end of its coil is connected to the power supply VCC, the other end is connected to the D pin of MOS tube Q1, and its normally open contact is connected in series with the functional circuit; The diode D1 is arranged in parallel with the coil of the relay K1.

6. An air conditioning lighting control device, characterized in that: It comprises a lamp group used for air-conditioning lighting and a switch control circuit as claimed in claim 5, wherein the contact of the relay K1 of the switch control circuit is connected in series to the power supply circuit of the lamp group.

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