Two-wire input dimming circuit for DC-DC (direct current-direct current) control
A DC-DC, dimming circuit technology, applied in the direction of electric lamp circuit layout, light source, electric light source, etc., can solve the problems of input capacitor vibration, poor dimming linearity, unable to shut down filter capacitor in time, etc., to eliminate noise. Effect
Active Publication Date: 2014-08-06
SELF ELECTRONICS CO LTD
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Problems solved by technology
This dimming method has at least two defects: 1. When the switch tube Q1 is disconnected, since the DC-DC input terminal is usually connected in parallel with a filter capacitor, and the filter capacitor cannot be turned off in time, the linearity of the dimming is very low. Difference
2. The turn-on and turn-off of the switch tube Q1 will cause the vibration of the input capacitor of the DC-DC power module, and there will be noise in the dimming state. These are fatal flaws in product performance
Method used
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[0008] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0009] Such as figure 1 The shown circuit diagram of a two-wire input dimming circuit suitable for DC-DC control includes a PWM dimming signal generation module 1, a DC-DC power supply module 2, a switch tube Q1 and a switch control circuit 3. In this embodiment, the switch The control circuit 3 is composed of a first resistor R1, a second resistor R2, a capacitor C1, a diode D1 and a transistor Q2, wherein the cathode of the diode D1 is connected to the drain of the switching tube Q1, and the anode of the diode D1 is connected to the emitter of the transistor Q2 The base of the transistor Q2 is connected to the drain of the switching tube Q1, the collector of the transistor Q2 is connected to the dimming control terminal Dim of the DC-DC power module, and the anode of the diode D1 is also connected to the The common ground terminal GND of t...
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The invention relates to a two-wire input dimming circuit for DC-DC (direct current-direct current) control, which comprises a PWM (pulse-width modulation) dimming signal generation module, a DC-DC power supply module and a switching tube. The circuit is characterized by comprising a switching control circuit, wherein the switching control circuit is connected between the switching circuit and a dimming control end of the DC-DC power supply module, and is used for converting a PWM signal generated by the PWM dimming signal generation module into a control signal which can control the dimming control end of the DC-DC power supply module, so that the DC-DC power supply module works at constant current when the switching tube is conducted, and the DC-DC power supply module closes output when the switching tube is disconnected; and therefore, the dimming linearity of the whole circuit is in accordance with the PWM drive signal of the switching tube. Compared with the prior art, by virtue of the simple switching control circuit, the PWM signal which controls connection and disconnection of the switching tube is converted into the control signal which can control the dimming control end of the DC-DC power supply module, so that the two-wire input dimming circuit has good dimming linearity, and avoids noise generated in a dimming state.
Description
technical field [0001] The invention relates to a two-wire input dimming circuit suitable for DC-DC control. Background technique [0002] For the existing two-wire input dimming circuit suitable for DC-DC control, please refer to the attached figure 2 As shown, the principle is to directly generate the PWM dimming signal through the PWM dimming signal generation module to control the on and off of the switch tube Q1, and then control the connection of the DC-DC power module through the on and off of the switch tube Q1 And disconnect, and then realize the dimming of the LED. This dimming method has at least two defects: 1. When the switch tube Q1 is disconnected, since the DC-DC input terminal is usually connected in parallel with a filter capacitor, and the filter capacitor cannot be turned off in time, the linearity of the dimming is very low. Difference. 2. The turn-on and turn-off of the switch tube Q1 will cause vibration of the input capacitor of the DC-DC power mod...
Claims
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IPC IPC(8): H05B37/02
Inventor 潘黄锋应俊俊董建国林万炯
Owner SELF ELECTRONICS CO LTD