WO2020153930A1

WO2020153930A1 - Current control circuit

Info

Publication number: WO2020153930A1
Application number: PCT/TR2020/050045
Authority: WO
Inventors: Atila TEZOL
Original assignee: Teletek Elektroni̇k Sanayi̇ Ve Ti̇caret Anoni̇m Şi̇rketi̇
Priority date: 2019-01-22
Filing date: 2020-01-21
Publication date: 2020-07-30
Also published as: TR202016234A2

Abstract

The invention relates to led lighting, dimming, easy replacement of power current in small/medium power electronics.

Description

CURRENT CONTROL CIRCUIT

The invention is related to led (light emitting diode) lighting, dimming, easy replacement of power current in small/medium power electronics.

The development of electronics continues very rapidly thanks to the development of semiconductor technology, the development of electronics in our daily lives facilitates our lives in many areas. Prior Art

The current control is carried out with constant resistors in the drivers that give a constant current like the led driver. Because resistors are a physical parts, it is not possible to change their value electronically. The change of the digital current uses DALI (Digital Adressable Lighting Interface) system, which is more complex and cost effective than the invention. In the patent document titled‘Current controlled led driver’, published in 2010/05477, which is included in the prior art, the current at the output of the driver is constant and the electronic elements required for the creation of the drive are excessive, which creates a problem in terms of cost.

In the patent document titled‘Ac micro led driver chip’ in issue no. 2015/02165, also withi the prior art, the current value cannot be excluded from the predetermined value. Since the current value is determined by the resistors on it, it must be specially designed for the led and device to operate. This makes the invention to be unavailable in devices of different energy spectrum.

Purpose Of Invention This invention allows the drivers to adjust the desired current value from the output section and make PF (power factor) correction easier. In addition, drive currents can be produced in the desired form (sine, trapezoidal, square...). Especially small power sources that provide compatible energy to the network make it easier to produce sine wave voltage. Brief Explanation of The Invention

The invention relates to led lighting, dimming, easy change of power current in small/medium power electronics, PF regulation and the current control circuit which transfers the desired current value to the device. It is characterized in that it has at least one mosfet (Metal Oxide Semiconductor Field Effect Transistor) to provide current control and/or to check the permeability of the current, at least one resistance for the stabilization of current to the drive and the PF regulation, and at least one drive which enables the regulation of PF and the connection of the current controlled current to the device. Explanation Of Figures

Figure 1: Dimming scheme Figure 2: PF correction scheme

Figure 3: Dimming + PF correction scheme

Explanation Of References

NO. Name of Part

1 Driver

2 Resistance

3 Mosfet

Decription of the Invention

The dimming scheme is given in Figure 1, which consists of driver (1), resistor (2) and mosfet (3). In one example use of the circuit; if the voltage to mosfet (3) is‘O’, it is current-proof and closed. RDS (resistance between drain-source ) is almost ¥(the current is too large to flow). If the voltage to mosfet (3) is‘ G, the mosfet (3) lets the flow of the current, it is open. RDS is in the minimum value here. If the voltage to mosfet (3) is between "0-1", the RDS on mosfet (3) is variable and it will be possible to change between 10 milliohm and ¥ ohm according to mosfet (3) type. In this way, current control will be possible since the total resistance will be R(1)+RDS. In sampling, resistance on Scheme (1) has been used in literature as resistance is expressed with‘R\

Figure 2 shows the PF correction scheme, which consists of driver (1), resistor (2) and mosfet (3). Another exemplary use of the circuit makes it possible to fully utilize all the energy of the device that will use the electrical energy output from the driver (1), that is, to check the current value of PF (power factor) to be 1.0. In order to keep the PF value to the desired extent and to make sufficient amount of current to reach the device, and the amount of current required to pass through the mosfet (3) is adjusted according to the value range. If the PF value is close to 1.0, thus saving energy since the energy consumption of the device is in the correct proportion.

Dimming + PF correction scheme is given in Figure 3, this scheme consists of driver (1), resistor (2) and mosfet (3). In another exemplary use of the circuit, it can be used by connecting the connection part with "S" (source) leg of the mosfet (3) in the dimming circuit scheme and the driver (1) in the PF correction circuit diagram. In this way, current control can be controlled more precisely.

Mosfet transistors are destroyed at small‘gate’ voltages due to excessive heat, as much current will pass through the transistor if the‘drain-source’ voltage is high. In this patent application, the‘drain-source’ voltage is equal to the Sens control voltage (UCS) voltage, and because the UCS voltages are small (0.1 to 0.8 volts) due to the structures of the drives, the mosfet is naturally protected and these voltages are not sufficient to destroy the mosfet transistor if selected appropriately. The invention allows easy dimming and energy saving by bringing PF closer to 1.0.

Claims

1- A current control circuit which transfers a desired current value to a device like led lighting, dimming, easy change of power current in small / medium power electronics, PF regulation, and it is characterized by comprising;

-at least one mosfet (3) to provide current control and/or control the current's permeability,

- at least one resistance (1) for stabilization of current to a driver (1) and PF regulation.

2- It is a current control circuit according to claim 1, and it is characterized by comprisimg where mosfet (3) and resistance are connected to each other in series in the current control circuit.

3 -The current control circuit in claim 1 and it is characterized by comprising

- at least one driver (1) that ensures the PF regulation and connection of the current whose current control is made to the device.

4. The current control circuit of claim 1, characterized by comprising that the voltage passing over the mosfet (3) when in operation converges to the value of "0" but is not "0".