DMX landscape lamp current expanding circuit

Abstract

The utility model relates to the field of LED lamp control, in particular to a DMX landscape lamp current expanding circuit. A DMX landscape lamp current expanding circuit comprises an illuminating lamp control chip U1 and a chip U2. The chip U2 outputs a PWM signal to the lighting lamp control chip U1 so as to control a lighting LED lamp string; the illuminating lamp control chip U1 is a DMX512 chip of which the model number is SM19522PH; the DMX landscape lamp current expanding circuit further comprises an MOS switch circuit. And the chip U2 outputs a PWM signal and transmits the PWM signal to the illuminating lamp control chip U1 through the MOS switching circuit. The beneficial effects of the utility model are that the MOS switch circuit is added, and the MOS switch circuit is utilized to indirectly control the current expanding circuit, thereby improving the reliability. And the problem that a DMX chip is impacted by current and the whole lamp goes wrong due to the fact that one current expanding circuit breaks down is avoided.

Description

Technical Field

[0001] The utility model relates to the field of LED lamp control, in particular to a DMX landscape lamp current boosting circuit. Background Technique

[0002] At present, most design schemes for multi-channel controlled LED RGB landscape lamps under the DMX protocol often adopt the DMX chip plus DC-DC scheme to boost the current to achieve a high-power design scheme. However, this simple DMX + current boosting mode has the following defects: 1) Due to the adoption of the current boosting circuit, the serious EMC interference problem often requires adding a large number of inductors and capacitor filter circuits in the circuit, resulting in a large circuit volume, increased production process difficulty, and a sharp increase in cost, ultimately leading to a reduction in the product's cost performance. 2) After the DMX chip boosts the current through the DC-DC scheme, due to the increased power, the volume and temperature of the driver increase significantly, making it difficult for the components on the driver to reach the service life required by users. 3) When a current boosting circuit fails, the DMX chip will be subjected to current impact, resulting in problems with the entire lamp. Content of the Utility Model

[0003] The purpose of the utility model is to provide a DMX landscape lamp current boosting circuit to solve the problems raised in the above background technique.

[0004] To achieve the above purpose, the utility model provides the following technical solution:

[0005] A DMX landscape lamp current boosting circuit includes: a lighting lamp control chip U1 and a chip U2; the chip U2 outputs a PWM signal to the lighting lamp control chip U1 to control the lighting LED lamp string;

[0006] The lighting lamp control chip U1 is a DMX512 chip of model SM19522PH; a DMX landscape lamp current boosting circuit further includes: a MOS switch circuit; the PWM signal output by the chip U2 is transmitted to the lighting lamp control chip U1 through the MOS switch circuit;

[0007] The MOS switch circuit includes: a resistor RB1, a resistor RB2, a resistor RB3, and a MOS transistor Q1; the signal input interface of the lighting lamp control chip U1 is connected to the D pole of the MOS transistor Q1 through a resistor R1 to receive the PWM signal; one end of the resistor RB1 is connected to the D pole of the MOS transistor Q1, and the other end of the resistor RB1 is connected to the power supply of the lighting lamp control chip U1; one end of the resistor RB2 is connected to the G pole of the MOS transistor Q1, and the other end of the resistor RB2 is connected to the other end of the resistor RB1; one end of the resistor RB3 is connected to the G pole of the MOS transistor Q1, and the other end of the resistor RB3 is connected to the S pole of the MOS transistor Q1 and grounded; the PWM signal of the chip U2 is output to the G pole of the MOS transistor Q1.

[0008] As a further solution of the present utility model: An aluminum substrate of a DMX landscape lamp current boosting circuit is flatly attached to a metal part of the landscape lamp body through heat-conducting silicone grease.

[0009] As a further solution of the present utility model: The lighting LED lamp string is connected to the output interface of the lighting control chip U1 and the power supply of the lighting control chip U1.

[0010] The power supply of the lighting control chip U1 is connected to the VCC pin of the lighting control chip U1 through the resistor R29.

[0011] As a further solution of the present utility model: The VCC pin of the lighting control chip U1 is grounded through the capacitor C1.

[0012] As a further solution of the present utility model: The CS pin of the lighting control chip U1 is grounded through the parallel-connected resistors R9 and R10 and is connected to the GND pin of the lighting control chip U1.

[0013] The beneficial effect of the present utility model is as follows: By adding a MOS switch circuit and indirectly controlling the current boosting circuit with the MOS switch circuit, the reliability is improved. It avoids the situation that when a current boosting circuit fails, the DMX chip is subjected to current impact, resulting in problems with the entire lamp.

[0014] By using the SM19522PH chip and utilizing its built-in passivated PWM level processor, the output PWM is optimized at the rising edge and the falling edge, solving the problem of EMC exceeding the standard caused by current mutation.

[0015] Using the aluminum substrate as a carrier to transfer heat to the metal part of the lamp body, achieving rapid heat dissipation and improving the service life of the circuit.

[0016] Other features and advantages of the present utility model will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a circuit diagram of a DMX landscape lamp current boosting circuit as the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0019] Such as Figure 1As shown in the figure, a DMX landscape light current boosting circuit includes: a lighting control chip U1 and a chip U2. The chip U2 outputs a PWM signal to the lighting control chip U1 to control the brightness of the lighting LED string.

[0020] The lighting control chip U1 is a DMX512 chip of model SM19522PH. A DMX landscape light current boosting circuit further includes: a MOS switch circuit. The PWM signal output by the chip U2 is transmitted to the lighting control chip U1 through the MOS switch circuit.

[0021] The MOS switch circuit includes: a resistor RB1, a resistor RB2, a resistor RB3, and a MOS transistor Q1. The signal input interface of the lighting control chip U1 is connected to the D pole of the MOS transistor Q1 through a resistor R1 to receive the PWM signal. One end of the resistor RB1 is connected to the D pole of the MOS transistor Q1, and the other end of the resistor RB1 is connected to the power supply of the lighting control chip U1. One end of the resistor RB2 is connected to the G pole of the MOS transistor Q1, and the other end of the resistor RB2 is connected to the other end of the resistor RB1. One end of the resistor RB3 is connected to the G pole of the MOS transistor Q1, and the other end of the resistor RB3 is connected to the S pole of the MOS transistor Q1 and grounded. The PWM signal of the chip U2 is output to the G pole of the MOS transistor Q1.

[0022] As a specific implementation manner, a DMX landscape light current boosting circuit uses an aluminum substrate to be flatly attached to the metal part of the landscape light body through thermal conductive silicone grease.

[0023] As a specific implementation manner, the lighting LED string is connected to the output interface of the lighting control chip U1 and the power supply of the lighting control chip U1. The power supply of the lighting control chip U1 is connected to the VCC pin of the lighting control chip U1 through a resistor R29.

[0024] As a specific implementation manner, the VCC pin of the lighting control chip U1 is grounded through a capacitor C1.

[0025] As a specific implementation manner, the CS pin of the lighting control chip U1 is grounded through a parallel-connected resistor R9 and resistor R10 and connected to the GND pin of the lighting control chip U1.

[0026] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

[0027] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A DMX landscape light current boosting circuit, comprising: Illumination control chips U1 and U2; the chip U2 outputs a PWM signal to the illumination control chip U1 to control the illumination LED light string; It is characterized in that the illumination control chip U1 is a DMX512 chip of model SM19522PH; the DMX landscape lamp current boosting circuit further includes: a MOS switch circuit; the PWM signal output by the chip U2 is transmitted to the illumination control chip U1 through the MOS switch circuit; The MOS switch circuit includes: resistor RB1, resistor RB2, resistor RB3 and MOS transistor Q1; the signal input interface of the illumination control chip U1 is connected to the D pole of the MOS transistor Q1 through resistor R1 to receive the PWM signal; one end of the resistor RB1 is connected to the D pole of the MOS transistor Q1, and the other end of the resistor RB1 is connected to the power supply of the illumination control chip U1; one end of the resistor RB2 is connected to the G pole of the MOS transistor Q1, and the other end of the resistor RB2 is connected to the other end of the resistor RB1; one end of the resistor RB3 is connected to the G pole of the MOS transistor Q1, and the other end of the resistor RB3 is connected to the S pole of the MOS transistor Q1 and grounded; the PWM signal of the chip U2 is output to the G pole of the MOS transistor Q1.

2. The DMX landscape lamp current boosting circuit according to claim 1, characterized in that The DMX landscape lamp current boosting circuit uses an aluminum substrate and is flatly attached to the metal part of the landscape lamp body through thermal conductive silicone grease.

3. The DMX landscape lamp current boosting circuit according to claim 1, characterized in that The illumination LED light string is connected to the output interface of the illumination control chip U1 and the power supply of the illumination control chip U1; The power supply of the illumination control chip U1 is connected to the VCC pin of the illumination control chip U1 through resistor R29.

4. The DMX landscape lamp current boosting circuit according to claim 3, characterized in that The VCC pin of the illumination control chip U1 is grounded through capacitor C1.

5. The DMX landscape lamp current boosting circuit according to claim 4, characterized in that The CS pin of the illumination control chip U1 is grounded through the parallel-connected resistors R9 and R10 and is connected to the GND pin of the illumination control chip U1.

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