Phase-switching dimming circuit
A phase-cut dimming and circuit technology, which is applied in the field of circuits, can solve the problems of inability to carry out network adjustment, remote operation, complicated operation, and poor precision.
Pending Publication Date: 2020-07-03
OPPLE LIGHTING +1
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Problems solved by technology
[0004] However, this kind of circuit can only adjust the brightness of the lamp by manually adjusting the resistance value of the sliding rheostat by the user. Not only is the operation complicated and the accuracy is poor, but also network adjustment and remote operation cannot be performed, and it can no longer meet the needs of digital and intelligent development
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[0028] figure 1 It is a circuit diagram of the circuit 10 that can adjust the brightness of the lamp 120 in the prior art. like figure 1 As shown, this circuit 10 has an AC power supply 110 for providing an AC voltage, a lamp 120, a sliding rheostat 130, a resistor 140, and a capacitor 150 connected in series to the AC power supply 110 in series, and this circuit 10 also has a two-terminal AC power supply. Device 160 (a two-terminal AC device is also called a bidirectional trigger diode, in order to distinguish the prior art from the solution of this embodiment, it is called a two-terminal AC device in the prior art) and a bidirectional thyristor 170 (a bidirectional thyristor is also called is called a bidirectional thyristor, in order to distinguish the prior art from the solution of this embodiment, it is called a bidirectional thyristor in the prior art), the first anode of the bidirectional thyristor 170 is connected between the lamp 120 and the sliding rheostat 130 Bet...
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The invention relates to a phase-switching dimming circuit, which comprises an alternating current power supply, a light source load, a charging unit, a capacitor and a switch unit, wherein the lightsource load, the charging unit and the capacitor are sequentially connected to the alternating current power supply in series, the charging unit is configured to receive a PWM control signal and be conducted according to the PWM control signal to charge the capacitor so as to make the voltage at the two ends of the capacitor be changed according to the conduction of the charging unit, the first end of the switch unit is connected with a connection point between the light source load and the charging unit, the second end of the switch unit is connected with a connection point between the charging unit and the capacitor, the third end of the switch unit is connected with a connection point between the capacitor and the alternating current power supply, and the switch unit is configured to beconducted when the voltage at the two ends of the capacitor reaches a threshold voltage, so that the light source load, the alternating current power supply and the first end and the third end of theswitch unit form a loop so as to realize the dimming of the light source load. According to the invention, a user can change the time when the capacitor is charged to reach the threshold voltage of the switch unit conduction by controlling the duty ratio of the PWM control signal, and brightness adjustment of the light source load is achieved.
Description
technical field [0001] The invention relates to the technical field of circuits, in particular to a phase-cut dimming circuit. Background technique [0002] Lamps are an indispensable tool in people's daily life. In practical applications, users often need to adjust the brightness of the lamp according to their preferences or needs. [0003] Although, there are already circuits that can change the brightness of lamps, such as figure 1 As shown, this circuit has an AC power supply for providing AC voltage, a lamp connected in series to the AC power supply, a sliding rheostat, a resistor, and a capacitor. This circuit also has a two-terminal AC device and a bidirectional thyristor. The bidirectional thyristor The first anode is connected between the lamp and the sliding rheostat, the second anode of the bidirectional thyristor is connected between the AC power supply and the capacitor, one end of the two-terminal AC device is connected between the resistor and the capacitor,...
Claims
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IPC IPC(8): H05B47/10
Inventor 高松朱元
Owner OPPLE LIGHTING