Control system compatible with DALI and PWM dimming interface and control method

Abstract

The invention relates to a control system compatible with a DALI and PWM dimming interface and a control method. The control system comprises a DALI or PWM controller, a DALI and PWM general circuit and a single-chip microcomputer which are sequentially connected with one another; the DALI and PWM general circuit includes a polarity conversion circuit, an MOS transistor, a bootstrap circuit and anopto-coupler circuit; the drain of the MOS transistor is connected with the polarity conversion circuit; the gate of the MOS transistor is connected with the bootstrap circuit; the source of the MOStransistor is connected with the opto-coupler circuit; the polarity conversion circuit is connected with the DALI or PWM controller; and the opto-coupler circuit is connected with the single-chip microcomputer. Compared with the prior art, the control system and the control method of the present invention can reduce stock and inventory for a manufacturer and facilitate purchase for a user.

Description

technical field [0001] The invention relates to a control system of a dimming power supply, in particular to a control system and method compatible with DALI and PWM dimming interfaces. Background technique [0002] Dimming power supplies have dimming control methods such as DMX, DALI, PWM, and analog signals, which require different circuits to correspond. Among these control methods, DALI and PWM are most suitable for long-distance transmission and are not easily affected by the number of control power sources and the length of the line, so they can be used in a wide range of applications, but the logic level difference between the two is large and compatibility is difficult. Both are designed as two sets of independent interface circuits, figure 1 and figure 2 It is a commonly used DALI interface circuit diagram, image 3 and Figure 4 Commonly used PWM interface circuit diagram. As shown in Table 1, the logic level of the DALI power interface, DALI high level: 9.5V...

AI Technical Summary

Problems solved by technology

However, the logic high level 9±2V of another PWM dimmer is close to the upper limit of DALI low level 6.5V. If you continue to use figure 1 In the DALI interface hardware circuit, the level logic judgment at DALIRX is easy to make mistakes, which will confuse high and low levels

In addition figure 1 Signals at different levels of the circuit will produce different hysteresis, and the MCU cannot compensate and correct at each point

In addition to the above shortcomings, the two interface circuits correspond to different components, PCBs and power supply models, which is not convenient for material preparation, production, application and promotion

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