Current distributor
A current distributor that simplifies the architecture and reduces the connecting wires. According to the invention, current distributor can be utilized for distributing the current evenly through a plurality of rows of light-emitting diodes. Each respectively is coupled between a supply pin and a first current pin. The first current pin is coupled to the current distributor. The current distributor is coupled to a total current pin. The current distributor comprises a first resistor, a plurality of first clamp circuitries, a second clamp circuitry and a plurality of first transistors. The first resistor has a first end and a second end. The first end is coupled to the supply pin. Each of the plurality of first clamp circuitries has a first terminal and a second terminal. Each of the first terminal of the first clamp circuitries is coupled to the second end of the first resistor. Each of the second terminal of the first clamp circuitries is coupled to the first current pin. The second clamp circuitry has a first terminal and a second terminal. The second terminal of the second clamp circuitry is coupled to the second end of the first resistor. The plurality of first transistors has a first terminal, a second terminal and a gate. The first terminal is coupled to the first current pin. The gate is coupled to the cathode of the second diode. The second terminal is coupled to the total current pin.
1. A current distributor for distributing the current evenly through a plurality of rows of light-emitting diodes, each respectively being coupled between a supply pin and a first current pin, said first current pin being coupled to said current distributor, said current distributor being coupled to a total current pin, said current distributor comprising:
a first resistor having a first end and a second end, said first end being coupled to said supply pin; a second resistor having a third end and a fourth end, said third end being coupled to said supply pin;
a plurality of first clamp circuitries being coupled to said second end of said first resistor and said first current pin;
a comparator having first and second input terminals and an output terminal, said first input terminal being coupled to said second end of said first resistor, said second input terminal being coupled to said fourth end of said second resistor;
a second clamp circuitry coupled between said fourth end of said second resistor and said total current pin; and
a plurality of first transistors having a first terminal, a second terminal and a gate, said first terminal being coupled to said first current pin, said gate being coupled to said output terminal of said comparator, and said second terminal being coupled to said total current pin.
2. The current distributor according to claim 1 , wherein each of said plurality of first clamp circuitries includes a forward diode.
3. The current distributor according to claim 1 , wherein said first terminal of each of said first transistor is a drain, and said second terminal of each of said first transistor is a source.
4. The current distributor according to claim 1 , wherein said comparator is an error amplifier.
5. The current distributor according to claim 1 , wherein said second clamp circuitry includes a forward diode.