Patent ID: 9215763
Filing Date: 2015-12-15
Classification: H05B,Y02B

Abstract:
1. A pulse current light-emitting diode (LED) driving circuit, comprising: a) an AC power supply configured to generate an AC input; b) a rectifier circuit configured to receive said AC input voltage, and to generate a DC input voltage; c) a sampling circuit configured to receive said DC input voltage, and to generate a DC sense voltage; d) a comparison circuit configured to receive said DC sense voltage, and to generate a first comparison signal; e) a feedback compensating circuit configured to sample a current that flows through a transistor, and to generate a compensation signal; f) a signal processing circuit configured to receive said first comparison signal and said compensation signal, and to generate an on signal, wherein said signal processing circuit comprises a filter circuit configured to smooth rising edges and falling edges of said on signal; and g) said transistor having a gate configured to receive said on signal, a drain configured to receive said DC input voltage, and a source coupled to a first terminal of a sampling resistor, wherein a second terminal of said sampling resistor is coupled to a first terminal of a load, and a second terminal of said load is coupled to ground, and wherein said transistor is turned on and a drain-source current is generated to drive said load when said on signal is active.