Dimming drive circuit and illumination apparatus including the dimming drive circuit

1. A dimming drive circuit for an illumination apparatus, comprising;

a filter circuit unit and a bleeder circuit unit,

a main control module connected to the filter circuit unit and the bleeder circuit unit, respectively, and

an auxiliary control module configured to reduce the current of the bleeder circuit unit and/or to switch off the bleeder circuit unit according to a characteristic input current of the dimming drive circuit prior to switch-off of the bleeder circuit unit by the main control module in a first operation state of the dimming drive circuit, and to prevent the filter circuit unit from releasing electrical energy via the bleeder circuit unit in a second operation state of the dimming drive circuit.

2. The dimming drive circuit according to claim 1 ,

wherein the auxiliary control module comprises a first control unit and a second control unit, wherein the first control unit reduces the current of the bleeder circuit unit and/or switches off the bleeder circuit unit according to the characteristic input current of the dimming drive circuit prior to switch-off of the bleeder circuit unit by the main control module in the first operation state, and the second control unit prevents the filter circuit unit from releasing electrical energy via the bleeder circuit unit in the second operation state.

3. The dimming drive circuit according to claim 1 ,

wherein the characteristic input current is an inrush current.

4. The dimming drive circuit according to claim 1 ,

wherein the first operation state is an operation state where the dimming drive circuit operates in leading phase dimming, and the second operation state is an operation state where the dimming drive circuit operates in trailing phase dimming.

5. The dimming drive circuit according to claim 2 ,

wherein the first control unit is configured to reduce the drive voltage input to a switch unit of the bleeder circuit unit according to the characteristic input current.

6. The dimming drive circuit according to claim 1 , further comprising:

a power conversion module connected between the main control module and an output module of the dimming drive circuit, wherein the power conversion module is capable of converting and outputting electrical energy from the filter circuit unit which is not released by the bleeder circuit unit to the output module in the second operation state.

7. The dimming drive circuit according to claim 2 ,

wherein the first control unit comprises a first diode and a first resistor, the cathode of the first diode and one end of the first resistor are respectively connected a control terminal of a switch unit of the bleeder circuit unit, and the anode of the first diode is connected to an input module of the dimming drive circuit, and the other end of the first resistor is connected to the main control module.

8. The dimming drive circuit according to claim 7 ,

wherein the second control unit comprises a second diode with its anode being connected to the bleeder circuit unit and its cathode being connected to the filter circuit unit.

9. The dimming drive circuit according to claim 7 ,

wherein the bleeder circuit unit comprises a transistor as the switch unit, and a second resistor and a third resistor, wherein the cathode of the first diode and the first resistor are respectively connected to the control electrode of the transistor, the second resistor is connected to the operating electrode of the transistor, and the reference electrode of the transistor is grounded via the third resistor.

10. An illumination apparatus, comprising:

a dimming drive circuit,

the dimming drive circuit comprising:

a filter circuit unit and a bleeder circuit unit,

a main control module connected to the filter circuit unit and the bleeder circuit unit, respectively, and

an auxiliary control module configured to reduce the current of the bleeder circuit unit and/or to switch off the bleeder circuit unit according to a characteristic input current of the dimming drive circuit prior to switch-off of the bleeder circuit unit by the main control module in a first operation state of the dimming drive circuit, and to prevent the filter circuit unit from releasing electrical energy via the bleeder circuit unit in a second operation state of the dimming drive circuit, and

a load connected to an output module of the dimming drive circuit.

11. The illumination apparatus according to claim 10 ,

wherein the load is configured as LED.

12. The dimming drive circuit according to claim 1 ,

wherein the auxiliary control module further comprises a first control unit and a second control unit;

wherein the first control unit further comprises a diode;

wherein the diode further comprises a cathode that is connected to a gate electrode of a transistor, and

wherein the transistor regulates the flow of electrical energy in the bleeder circuit.

13. The dimming drive circuit according to claim 1 ,

wherein the auxiliary control module further comprises a diode and a resistor;

wherein an inrush current causes the diode and resistor to pull down the drive voltage of a transistor; and wherein the pulling down of the drive voltage of the transistor regulates the flow of electrical energy in the bleeder circuit.