US 10,085,312 B2 · Bus bar current control circuit, constant-current driving controller and LED light source

Abstract

The present invention relates to a busbar current control circuit, a constant current drive controller and an LED light source, wherein the busbar current control circuit comprises a branch resistor, a branch capacitor and a branch current source, the branch resistor and the branch capacitor are connected in parallel to form a branch, one end of the branch is connected a position between the busbar resistor and the load, and the other end is connect to the branch current source; the branch current source outputs to the branch a current of adjustable magnitude, the sum of the voltage on the busbar resistor and the voltage on the branch resistor remains constant. Wherein the branch resistor occupies a portion of the voltage of the busbar resistor so that the magnitude of the current output by the busbar changes continuously, that is, when the current flowing into the branch increases, the voltage occupied by the branch resistor increases and the voltage on the busbar resistor decreases, so as to reduce the current on the busbar. Since the branch current is smoothly adjusted by the branch current source, the regulation of the Output current on the busbar is also smooth. This avoids the use of the SPWM wave or the dimming switch circuit in the prior art, and the stroboscopic phenomenon due to the discontinuity of the driving current.

Claims10

Dependent claims

A busbar current control circuit comprising a branch resistor, a branch capacitor and a branch current source, wherein the branch resistor and the branch capacitor are connected in parallel to form a branch;

one end of the branch is connected to a position between a busbar resistor and a load, and another end is connected to the branch current source;
and the branch current source outputs a current of adjustable magnitude to the branch;
wherein the branch capacitor is a capacitor of 0.01 to 0.22 μF, and the branch resistor is a resistor of 0.5 to 2 KΩ, the branch current source is a constant current source;
and
wherein the constant current source comprises a first triode, a second triode, an equivalent voltage input source and a branch power source;
the equivalent voltage input source is a variable resistor, wherein a fixed pin of the variable resistor is connected to the branch power source and another fixed pin is connected to a base of the first triode, a moving pin of the variable resistor is connected to a base of the second triode;
the base of the first triode is connected to a position between the base of the second triode and the moving pin, and a collector of the first triode is connected to the base of the first triode and an emitter of the first triode is grounded;
a collector of the second triode is used as the output of the constant current source and an emitter of the second triode is grounded.

5 more elements

A constant current drive controller comprising a busbar current control circuit wherein the busbar current control circuit comprises a branch resistor, a branch capacitor and a branch current source, wherein the branch resistor and the branch capacitor are connected in parallel to form a branch;

one end of the branch is connected to a position between a busbar resistor and a load, and another end of the branch is connected to the branch current source;
and the branch current source outputs a current of adjustable magnitude to the branch, a constant current control chip, the busbar resistor, a diode and an energy storage inductor, the constant current control chip comprises a first voltage measurement pin, a second voltage measurement pin and a switch pin;
the two ends of the busbar resistor are respectively connected to a power supply and the positive terminals of the load, the negative terminal of the load is connected to one end of the energy storage inductor, another end of the energy storage inductor is connected to the positive terminal of the diode and the switch pin, the first voltage measurement pin is connected to a position between the busbar resistor and the power supply;
one end of the branch formed by the branch resistor and the branch capacitor connected in parallel in the busbar current control circuit is connected to a position between the busbar resistor and the load, the another end of the branch is connected to the second voltage measurement pin;
a sum of the voltage on the busbar resistor and the voltage on branch resistor remains constant.

2 more elements

Dependencies are inferred from the claim text.

Bus bar current control circuit, constant-current driving controller and LED light source

Life of this patent

Bus bar current control circuit, constant-current driving controller and LED light source

Life of this patent

Abstract

Claims10