Currnet holding circuit for bidirectional triode thyristor dimmer and linear dimming driving circuit using the same

A linear dimming driving circuit, comprising:

• an overcurrent protecting circuit;
• a rectifying bridge comprising four rectifying diodes connected;
• a current holding circuit for a bidirectional triode thyristor (TRIAC) dimmer which is a resistance and capacitance (RC) circuit;
• a surge suppressing circuit configured to absorb a high surge voltage of an input voltage;
• a filtering circuit configured to reduce or filter out flicker caused by an asymmetrical current of a light emitting diode (LED) load due to the RC circuit;
• a linear constant-current circuit;
• and
• a flicker eliminating circuit configured to eliminate the flicker caused by the asymmetrical current of the LED load due to the RC circuit,
• wherein an input terminal of the overcurrent protecting circuit is connected to commercial low-frequency alternating-current power, an output terminal of the overcurrent protecting circuit is connected to an input terminal of the rectifying bridge, the RC circuit comprises a first resistor and a first capacitor connected in series, and the RC circuit is connected in parallel with any one of the rectifying diodes, an output terminal of the rectifying bridge is connected to an input terminal of the surge suppressing circuit, an output terminal of the surge suppressing circuit is connected to an input terminal of the filtering circuit, an output terminal of the filtering circuit is connected to an input terminal of the linear constant-current circuit, an output terminal of the linear constant-current circuit is connected to an earth terminal of the rectifying bridge and the surge suppressing circuit, the linear constant-current circuit is connected to an output terminal of the flicker eliminating circuit, and the LED load is connected between the input terminal of the filtering circuit and an input terminal of the flicker eliminating circuit.