WO2012146090A1 - Led constant current driven circuit device - Google Patents

Abstract

The present utility model is an LED constant current driven circuit device with a simple structure, low costs and good energy-saving effects. It includes a power supply VC1, a rectifier filter device, etc., with the rectifier filter device being connected to alternating current, the output end a of the rectifier filter device and an output voltage rectifier device being connected to an input end ① of an autotransformer, an output voltage rectifier filter and load device also being connected to a load energy output end ② of the autotransformer, a PWM controlled IC device being connected to an output end ③ of the autotransformer via an MOS tube Q1,and the power supply VC1 being connected to the PWM controlled IC device, and it further includes a current sampling device which is connected to the PWM controlled IC device via the MOS tube Q1 and is also directly connected to the PWM controlled IC device. The advantage of the present utility model is that the costs are low while the efficiency can be up to more than 95%.

Description

 LED constant current driving circuit device

 The utility model relates to an LED: constant current circuit device, in particular, a high cost; 3⁄4 rate factor and high efficiency EDii flow swaying electric device. Background technique

 With the promotion of LED lamps, the efficiency of driving power supply for LED lamps has increased to 3⁄4 and new problems for power supply manufacturers. At the same time, in order to ensure the power of the two fluorescing, the power of the 3⁄4 device essential. Between the two: often face the contradiction that can not be considered at the same time. If the ttE>«flow sensible power efficiency can reach more than 93%; there are very few, and the elbow rate factor can reach 0. 93 © is even more ff scan. Therefore, under the premise of ensuring high power, the maximum efficiency is very derogatory. For every 1% improvement, the cost is reduced by 1%, and the economic benefits are considerable.

 At present, the circuit forms of various non-isolated constant current power supplies generally use single-winding charge and discharge to supply current to the LEDs. In the control circuit, the power number correction is included in the control circuit. The simple routine circuit, the power shortage is not high; The power factor correction is included in the tricky road: the X of the circuit is only 3⁄4 single-winding in the circuit structure, and the requirements on the surrounding devices are high*, and the efficiency cannot be maximized.

 The applicant applied for the special W number of 201120048101, 8 on February 25, 2011, which solved the above problem; but the structure is more complicated than green and the cost is relatively competitive. Summary of the invention

Sell-owned with the present type of object is to provide a f low-cost and ^a high power factor and efficiency of the constant current LED driver circuit arrangement.

 The object of the present invention is achieved as follows: it comprises a power source VC1, a rectifying filter device, an output voltage rectifying filter and a load device, a PWM control IC device, and an autotransformer, and the rectifying filter device is: an alternating current device, The transmission end a of the truncated filter device is connected with the output quasi-pressure Ling Weng and the negative Weng device. The pressure-transformed fiber filter negative Weng Weng is connected with the input end 5 of the autotransformer, and the output J1 rectification filter and load device The load energy output end of the brook and the coupling transformer is rented. The ρ 丽 control ic device 遒 over: Gu & tube Qi and: the m transformer is connected to the m end, the power supply VC1 is connected to the p-control ic device, it also includes弑 current sampling, current sampling device through excitation tube and PWM control

IC device is connected, while the current sampling apparatus is also directly connected to the _PWM: ή control device IC

 The advantages of this new type of practice are: 1. The applicant has applied for the patent; the patent number is 201120048101. The patent is more than 3⁄4 nose, and can also prove the high power factor (too much window) The ultra-high efficiency of the real-life constant-current power supply is made possible by the structure of the electric power system, and the maximum efficiency of more than 95% can be achieved by adding the Longyi key of each part of the circuit.

 Plastic 1 is the circuit of the utility model ©.

Replacement page (Article 26) detailed description

 As shown in FIG. L, including a power supply VC1, a rectifying and filtering device, an output voltage rectifying and filtering device, a PWM control IC device, and an autotransformer, the rectifying and filtering device is connected to an alternating current power supply and a rectifying and filtering device: an output a and The output voltage rectification filter and the load device are connected, the output voltage rectification filter and the load device are connected to the input end of the self-coupling transformer, and the output voltage rectification filter and the load device are also connected to the load energy output end 2 of the autotransformer; PWM control The IC device is connected to the output terminal 3 of the autotransformer through the MOS tube Q1. The power supply VC1 is connected to the PWM control IC device, and further includes a current sampling device. The current sampling device is connected to the PWM control IC device through the MOS tube Q1, and the current sampling device is simultaneously connected. It is also directly connected to the P-control IC device. However, in order to improve the control characteristics and effects, the corresponding amplification and reference circuits can be added between the sampling resistor and the PWM control IC in actual use, or integrated in the P-control IC. .

The output voltage rectification filtering and load device comprises an LED lamp, a diode D1 and a capacitor C1; the current sampling device comprises a resistor 'Rl _{: the} PWM control IC device comprises a power factor correction control IC1; a positive pole a end of the LED lamp and a rectifying and filtering device, an electrolytic capacitor C1 the positive and negative electrodes of diode D1 is connected _nan;: negative electrode terminal b of the LED lamp of the electrolytic capacitor, and the autotransformer T1 is connected to an input terminal ①; ② the positive electrode output terminal of the load and the energy from the parent of the transformer T1 connected diode D1 orange The output end of the autotransformer T1 (D is connected to the drain D of the MOS transistor Q1; the source S of the MOS transistor is connected to the terminal of the resistor R1, the other end of the resistor R1 is grounded, and the gate G of the MOS transistor 01 is connected to the power The factor correction control IC1 drives the output OUT pin; the current feedback control input terminal INV of the power factor correction control IC1 is connected to the connection terminal of the current sampling device R1 and the source S of the MOS tube, and the power factor correction control IC1's VCC pin and the power supply VC1 Connect, power factor correction control IC1's GND pin is grounded.

 The working principle of the utility model is as follows -

When the square wave output from the output terminal of IC1 is at a high level, the Ql M0S tube is turned on, and the rectified AC power is discharged through the load LED into the 1-pin of the autotransformer from the 3 pin to charge the transformer 1-3 winding, when the IC1 outputs When the square wave output from the terminal OUT enters the low level> The M0S tube enters the off state, and the energy stored in the winding of the coil 1-3 is supplied to the LED load through the 1-2 winding output through the D1 rectification and C1 filtering to complete the energy conversion. Action; when the current flowing through the current sampling device generates a voltage greater than the set voltage on R1, it is input to the feedback input terminal of IC1, shortening the high-level time of the output square wave at the OUT terminal, and reducing the energy supplied to the transformer. Thereby reducing the current of the LED load, and vice versa, increasing the high-level time of the output square wave of the OUT terminal of IC1, increasing the energy supplied to the transformer, thereby increasing the current of the LED load and achieving constant control of the current flow of the LED load.

 At this point, the device is completed.

 The principle of energy-saving effect of the device is: charging a high-resistance and large-inductance through a small current, and then discharging the load to the load through a low internal resistance and small inductance, greatly reducing the loss during charging and discharging, and improving the energy conversion efficiency through the current of the energy storage inductor. Sampling, realizing dynamic and timely control, the stability of the electric sea is good, and the balance of the 3⁄4 road is greatly simplified, that is, the cost is reduced and the efficiency is greatly increased.

 Among them, the auxiliary power supply VC1, rectifier circuit and IC1 of the switching constant current power supply are common technologies. The auxiliary power supply can generally be a set of power supplies, or two independent auxiliary powers can be respectively connected to the IC1 and the electric sampling device and the IC. Amplifier and other circuits may be added; the auxiliary power supply may be added to the autotransformer after the auxiliary winding is rectified and filtered, and the hue may be obtained after the rectified high voltage step-down; the rectifying circuit may be a half-wave rectification of a single rectifying diode. It can also be a rectification circuit; the 101 power control IC can be an independent P-control IC or a control IC with a power factor correction function, or a module device integrated with a power transistor. In addition, the current in the above circuit

2 Replacement page (Article 26) The sampling device adopts the resistance to take the normal 3⁄4f method. Actually, the auxiliary current can also be used to ffi other currents, or the current sampling device with amplification function can be used, but the above changes do not affect the utility model. Effect. At the same time, the efficiency can be raised to the satisfaction level: the blank depends on the experience and fine debugging of the dedicated shaving user.

 3

 Replacement page (Article 26)

Claims

Claim 1. A constant current driving circuit is mounted, which is a power supply CL, a rectifying device, a sigmoidal filtering, and a load loading device. The control IC device and the autotransformer are used to rectify the filter device. The output terminal a of the AC power supply and the whole filter device is connected with the output voltage fiber filter and the load device, and the power transmission rectifier filter and the load device are self-contained. The continuous end of the 3⁄4 pressure device is phased out, the output voltage is rectified and the load is loaded with the blank and the negative output of the 'auto-coupled ffi device is connected to the orange output; P shop: control the TC device through a OS tube ^ and Since _: the input end of the coupling transformer is 3, the power supply is connected to the P1M control device, which is characterized in that it includes an electric sampling device, and the electric sampling device is connected to the PWM control IC device through the M0S pipe 3⁄4, and the current sampling is performed. The device is also directly connected to the PWM control IC device. According to one of claims: LBD constant current drive circuit means, characterized in that _Weng; right foot: 1¾ sense voltage Fan air filtering apparatus comprising an LED lamp and a load, a diode D1 and a capacitor; ¾ current sampling means comprises a resistor βΐ; PWi Control Ιβ device package factor correction control JC1; LEO positive a terminal and rectifier filter device, electrolytic capacitor: ca: positive and two poles f 01 St negative connection; LED 'light's negative 椟 b end and electric容翁负镞, and connected to the T1 input terminal 1 of the transformer; the anode of the diode D1 is connected to the load energy output end of the autotransformer T1. The output terminal 3 of the transformer T1 and the drain D of the MOS tube Q1 are connected. Connected; the source S of the M0S tube is connected to one end of the resistor, the other end of the resistor Rl fift is grounded, M0$ tube: the gate 6 of Qi is connected to the power of the error correction control 101. The OOT pin power factor is positively controlled mmi feedback The control input window is connected to the connection end of the 3⁄4 flow pick-up device R1 and the MOS tube cut-off source S. The power is corrected by the VCC pin of the 狻1C1 and the power supply VG1 is connected, and the power factor calibration IE controls the GND pin of the JG1 to be grounded. 4 Replacement page (Article 26)