A dual-output switch color temperature adjustment circuit

Abstract

A dual-output switch color temperature adjustment circuit, the circuit includes: a power supply Uo; an RC oscillation circuit connected in parallel with the power supply Uo; a first LED light-emitting circuit and a second LED light-emitting circuit connected in parallel with the RC oscillation circuit; a constant current and constant voltage chip connected to the first LED light-emitting circuit; an RC oscillation circuit connected in parallel with the power supply Uo; a first LED light-emitting circuit and a second LED light-emitting circuit connected in parallel with the RC oscillation circuit; a constant current and constant voltage chip connected to the first LED light-emitting circuit. The circuit can output a custom current that can be adjusted arbitrarily.

Description

Technical Field

[0001] The invention relates to the field of circuits, and in particular to a dual-channel output switch color temperature adjustment circuit. Background Art

[0002] LED color temperature adjustment is to change the ratio of different lights. Adding red light makes the color temperature warmer, and adding blue light makes the color temperature cooler. To adjust the brightness, change the current flowing through the LED. The larger the current, the brighter it is. On the contrary, it is dimmer. The current adjustment is achieved by changing PWM. The so-called PWM is pulse width adjustment. The most fundamental method of pulse width adjustment is to change the value of the resistor and capacitor that determine its width. The larger the RC product, the larger the width. However, traditional circuits cannot adjust the color temperature according to any current. Summary of the invention

[0003] Based on this, it is necessary to provide a dual-output switch color temperature adjustment circuit.

[0004] A dual-output switch color temperature adjustment circuit, the circuit comprising:

[0005] Power supply Uo;

[0006] An RC oscillation circuit connected in parallel with the power supply Uo;

[0007] A first LED light-emitting circuit and a second LED light-emitting circuit connected in parallel with the RC oscillation circuit;

[0008] A constant current and constant voltage chip connected to the first LED lighting circuit.

[0009] In one embodiment, the circuit further comprises:

[0010] A single chip microcomputer U2 is connected to one pin of the constant current and constant voltage chip.

[0011] In one embodiment, the RC oscillation circuit comprises:

[0012] Resistor R1;

[0013] A capacitor C7 is connected to the resistor R1.

[0014] In one embodiment, the circuit further comprises:

[0015] IO1 and IO2 connected to the microcontroller U2.

[0016] In one embodiment, the circuit further comprises:

[0017] The transistors Q1 and Q2 are connected to the IO1.

[0018] Beneficial effects:

[0019] The present invention provides a dual-output switch color temperature adjustment circuit, the circuit comprising: a power supply Uo;

[0020] An RC oscillating circuit connected in parallel with the power source Uo; a first LED lighting circuit and a second LED lighting circuit connected in parallel with the RC oscillating circuit; and a constant current and constant voltage chip connected to the first LED lighting circuit. The circuit can output a custom current that can be adjusted arbitrarily. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The schematic diagram of a dual-output switch color temperature adjustment circuit is shown in FIG. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] Please refer to Figure 1 , a dual-output switch color temperature adjustment circuit, the circuit comprising:

[0024] Power supply Uo;

[0025] An RC oscillation circuit connected in parallel with the power supply Uo;

[0026] A first LED light-emitting circuit and a second LED light-emitting circuit connected in parallel with the RC oscillation circuit;

[0027] A constant current and constant voltage chip connected to the first LED lighting circuit.

[0028] In one embodiment, the circuit further comprises:

[0029] A single chip microcomputer U2 is connected to one pin of the constant current and constant voltage chip.

[0030] In one embodiment, the RC oscillation circuit comprises:

[0031] Resistor R1;

[0032] A capacitor C7 is connected to the resistor R1.

[0033] In one embodiment, the circuit further comprises:

[0034] IO1 and IO2 connected to the microcontroller U2.

[0035] In one embodiment, the circuit further comprises:

[0036] The transistors Q1 and Q2 are connected to the IO1.

[0037] It should be noted that if Figure 1 As shown, the constant voltage and constant current chip U1, the 5th pin gives a fixed reference voltage VF, the current of the first LED circuit I1 = VF / RS1; the current of the second LED circuit I2 = VF / RS2; the resistance values ​​of RS1 and RS2 can be changed to customize the current 2, the two IO ports (IO1, IO2) of the single-chip microcomputer U2, the output mode is IO1 high level, IO2 high level, IO1 and IO2 high level at the same time, three modes cycle. 3, when IO1 outputs high level, Q3 and Q5 are turned on, at this time only the first circuit LED works, current I1 = VF / RS1 when IO2 outputs high level, Q4 and Q6 are turned on, at this time only the second circuit LED works, current I2 = VF / RS2; when IO1 and IO2 output high level at the same time, Q3Q4Q5Q6 are all turned on, at this time both circuit LEDs work, among which, current I1 = VF / RS1; current I2 = VF / RS2.

[0038] The present invention provides a dual-output switch color temperature adjustment circuit, the circuit comprising: a power supply Uo;

[0039] An RC oscillating circuit connected in parallel with the power source Uo; a first LED lighting circuit and a second LED lighting circuit connected in parallel with the RC oscillating circuit; and a constant current and constant voltage chip connected to the first LED lighting circuit. The circuit can output a custom current that can be adjusted arbitrarily.

[0040] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A dual-output switch color temperature adjustment circuit, characterized in that: The circuit comprises: Power supply Uo; An RC oscillation circuit connected in parallel with the power supply Uo; A first LED light-emitting circuit and a second LED light-emitting circuit connected in parallel with the RC oscillation circuit; A constant current and constant voltage chip connected to the first LED light-emitting circuit; A single chip microcomputer U2 connected to one pin of the constant current and constant voltage chip; IO1 and IO2 connected to the single chip microcomputer U2; Three-stage tubes Q1 and Q2 connected to the IO1; The RC oscillation circuit comprises: Resistor R1; A capacitor C7 connected to the resistor R1; The output modes of the single-chip computer U2 are IO1 high level, IO2 high level, IO1 and IO2 high level at the same time, and the three modes are cycled; when IO1 outputs high level, only the first loop LED works, and the current I1=VF / RS1; when IO2 outputs high level, only the second loop LED works, and the current I2=VF / RS2; when IO1 and IO2 output high level at the same time, the two loop LEDs work, among which the current I1=VF / RS1; the current I2=VF / RS2; VF is the fixed reference voltage given by the constant voltage and constant current chip, I1 is the current of the first LED circuit, I2 is the current of the second LED circuit, RS1 is the resistance of the first LED circuit, and RS2 is the resistance of the second LED circuit.

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