CN214014584U

CN214014584U - Valley-filling isolation flyback merging LED circuit

Info

Publication number: CN214014584U
Application number: CN202023249175.6U
Authority: CN
Inventors: 陈大双; 王先富; 张金; 刘进良
Original assignee: Shenzhen Zhengyuan Technology Co ltd
Current assignee: Shenzhen Zhengyuan Technology Co ltd
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2021-08-20
Anticipated expiration: 2030-12-29

Abstract

The utility model provides a fill out millet and keep apart to flyback and merge LED circuit, including input rectifier circuit, input rectifier circuit has two outputs, every a LED drive circuit, two are all connected to the output LED drive circuit's circuit structure is the same, LED drive circuit is including the millet circuit of filling out, LED drive control chip, transformer and the output rectification filter circuit who connects gradually, output rectification filter circuit includes the anodal output of LED and LED negative pole output, two the anodal output of LED of output rectification filter circuit connects. The utility model discloses a voltage is 180 supplyes 265V, can compromise most countries and customer's demand, compromises low cost, keeps apart safety, does not have stroboscopic and high-power characteristics, has more comfortable, cheap, safe, energy-conserving, healthy and suitable luminous environment's characteristics.

Description

Valley-filling isolation flyback merging LED circuit

Technical Field

The utility model relates to a LED power field, in particular to keep apart flyback and merge LED circuit.

Background

The rapid development of lighting technology and the continuous maturation of high-power high-brightness LED technology. In the environment-friendly promotion today, the constant-current non-stroboscopic LED will become a new lighting source in the twenty-first century. The characteristics of an LED determine its luminous intensity, which is controlled by the driving current. Because there are many drive devices without stroboflash, the volume problem, the heat dissipation problem leads to the appearance of the driven ware seriously to be limited.

SUMMERY OF THE UTILITY MODEL

The utility model provides a fill out millet and keep apart flyback and merge LED circuit to solve at least one above-mentioned technical problem.

For solving the problem, as an aspect of the utility model provides a fill up millet and keep apart to flyback and merge LED circuit, including input rectifier circuit, input rectifier circuit has two outputs, every LED drive circuit, two are all connected to the output LED drive circuit's circuit structure is the same, LED drive circuit is including the millet circuit of filling up, LED drive control chip, transformer and the output rectification filter circuit that connect gradually, output rectification filter circuit includes the anodal output of LED and LED negative pole output, two the anodal output of LED of output rectification filter circuit connects.

Preferably, the valley filling circuit includes a first diode, a second diode, a third diode, a first resistor, a first electrolytic capacitor, and a second electrolytic capacitor, the positive electrode of the output end of the input rectification circuit is sequentially connected to the second electrolytic capacitor and the first end of the second diode, the second end of the second electrolytic capacitor is grounded through the first diode, the second end of the second diode is grounded through the first electrolytic capacitor, and the second end of the second electrolytic capacitor is sequentially connected to the second end of the second diode through the third diode and the first resistor.

Preferably, the model of the LED driving control chip is BP3167FH, a first end of the second diode is connected to a pin 4 of the LED driving control chip through a second resistor, and pins 5 and 6 of the LED driving control chip are connected to the primary coil of the transformer.

Preferably, the output rectifying and filtering circuit is connected with a secondary coil of the transformer.

Since the technical scheme is used, the utility model discloses a voltage is 180 supplyes optical 265V, can compromise most countries and customer's demand, compromises low-cost, keeps apart safety, does not have stroboscopic and high-power characteristics, has more comfortable, cheap, safe, energy-conserving, healthy and suitable luminous environment's characteristics.

Drawings

Fig. 1 schematically shows a circuit schematic of the invention.

Detailed Description

The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.

As an aspect of the utility model provides a fill up millet and keep apart to flyback and merge LED circuit, including input rectifier circuit, input rectifier circuit has two outputs, every LED drive circuit, two are all connected to the output LED drive circuit's circuit structure is the same, LED drive circuit is including the millet circuit of filling up, LED drive control chip, transformer and the output rectification filter circuit that connect gradually, output rectification filter circuit includes the anodal output of LED and LED negative pole output, two the anodal output of LED of output rectification filter circuit connects.

Preferably, the model of the LED driving control chip is BP3167FH, a first end of the second diode is connected to a pin 4 of the LED driving control chip through a second resistor, and pins 5 and 6 of the LED driving control chip are connected to the primary coil of the transformer. Preferably, the output rectifying and filtering circuit is connected with a secondary coil of the transformer.

The circuit structure of the present invention is described in more detail as an embodiment with reference to the schematic circuit diagram of fig. 1.

In an embodiment, the utility model provides an isolation flyback merges LED circuit includes input rectifier circuit, fill valley circuit, transformer T1, transformer T2, output rectification filter circuit, LED drive control chip U1, and LED drive control chip U2, wherein, LED drive control chip U1, be BP3167FH with LED drive control chip U2's model, the integrated 600V power switch in chip, adopt the demagnetization detection technique and the high-pressure JFET power supply technique of patent, need not VCC electric capacity and starting resistance, short-circuit protection, open circuit protection chip, power supply undervoltage protection, the overheat control function.

The alternating current is connected with a first valley filling circuit (an electrolytic capacitor EC2 and a diode D2) through the positive electrode of a first path output end of an input rectifying filter circuit, is connected with a 4 th pin of an LED drive control chip U1 through a resistor R3, the 5 th pin and the 6 th pin of the LED drive control chip U1 are connected with a primary coil of a transformer T1, and a secondary coil of the transformer T1 is connected with the positive electrodes of the diode D5 and the electrolytic capacitor EC5 in an output rectifying circuit and then is output from the positive electrode output end of the LED. Meanwhile, the alternating current is connected with a second valley filling circuit (an electrolytic capacitor EC4 and a diode D7) through the anode of the second output end of the input rectifying and filtering circuit, is connected with the 4 th pin of an LED driving control chip U2 through a resistor R9, the 5 th pin and the 6 th pin of the LED driving control chip U2 are connected with the primary coil of a transformer T2, and the secondary coil of the transformer T2 is connected with the anodes of the diode D10 and the electrolytic capacitor EC6 in another output rectifying circuit and then is output from the anode output end of the LED. The LED anode output ends of the two output rectifying circuits are connected in a common positive mode.

At present, an AC/DC converter is generally connected to a power grid through a rectifying circuit. The input part of the device is generally composed of a bridge rectifier and a filter capacitor, and both the bridge rectifier and the filter capacitor belong to nonlinear components. Due to the existence of the large-capacity filter capacitor, the conduction angle of the rectifier diode becomes narrow, and the rectifier diode can be conducted only near the peak value of the alternating-current input voltage, so that the alternating-current input current generates serious distortion and becomes spike pulse, and the current waveform contains a large amount of harmonic components, thereby not only polluting a power grid, but also obviously reducing the active power output after filtering and greatly reducing the power factor. The power factor of the common AC/DC converter is low and can only reach about 0.6. Therefore, the power factor of the power grid is improved, the line loss can be reduced, the harmonic pollution of the power grid can be reduced, and the power supply quality of the power grid is improved. As shown in fig. 1, after being electrified, the L/N alternating current is respectively connected to rectifier bridges BD1 and BD2 through fuse tubes F1 and F2. The rectified currents are rectified by rectifier bridges BD1 and BD2 and are input to valley filling circuits of two LED driving circuits respectively. The utility model provides a fill out millet circuit is the conduction angle that utilizes the latter millet circuit of filling out of rectifier bridge to increase substantially the rectifier tube, through filling out the millet point, makes input current become from the spike to be close to sinusoidal wave's waveform, improves power factor to about 0.9, is showing and is reducing total harmonic distortion. Compared with the traditional inductive passive power factor correction circuit, the inductive passive power factor correction circuit has the advantages of simple circuit, lower cost, obvious power factor compensation effect and no need of using a large inductor with large volume and heavy weight in an input circuit.

Taking the first branch as an example, as shown in fig. 1, the valley filling circuit is composed of a diode D1, a diode D2, a diode D3, an electrolytic capacitor EC2, and an electrolytic capacitor EC1, when the AC input voltage is higher, due to the connection of the diode D3, the electrolytic capacitor EC2 and the electrolytic capacitor EC1 are charged in series, and as long as the AC voltage is higher than the voltages on the electrolytic capacitor EC2 and the electrolytic capacitor EC1, the line current will pass through the load. Once the line voltage amplitude drops below the charging voltage on each capacitor, the diode D3 is turned off in the reverse direction, and the diode D1 and the diode D2 are turned on, at which time the AC input current no longer supplies power to the load, and the electrolytic capacitor EC2 and the electrolytic capacitor EC1 discharge to the load bus in a parallel manner, thereby greatly increasing the conduction angle of the rectifier tube.

At this time, the bus voltage is output to the 4 pins of the LED drive control chip U1 through the resistor R3, the internal VCC is charged through the internal high-voltage JFET, and when the internal VCC voltage reaches the chip turn-on threshold, the chip internal control circuit starts to work. When the chip is working normally, the required VCC current is still supplied to it through the internal JFET. The LED drive control chip U1 detects the peak current of the primary side of the transformer cycle by cycle, the resistors S1, S2 and S3 are connected with the 7 th pin CS end of the LED drive control chip U1 and then connected to the input end of an internal peak current comparator, the internal peak current comparator is compared with the internal 400mV threshold voltage, and when the CS voltage reaches the internal detection threshold, the power tube is turned off. The resistor R2 is connected to the 1 st pin of the LED driving control chip U1, and when the ROVP pin is floating or the ROVP resistor is greater than 120Kohm, the default Tovp of the LED driving control chip U1 is 4.2 us. When the ROVP resistance is greater than 50Kohm and less than 120Kohm, the built-in clamp Tovp of the LED driving control chip U1 is 3 us; when the ROVP resistance is larger than 15Kohm and smaller than 50Kohm, the Tovp can be set by the resistance of the ROVP, and the current flowing out of the ROVP pin is about 30 uA. The ROVP pin has an EN function, the ROVP voltage is higher than 0.3V, the chip enters an Enable function, and the chip is started. The ROVP voltage is lower than 0.1V, the chip enters Disable protection, and output is turned off, so that the ROVP resistance needs to be larger than 15K; the output idle voltage required by itself can be set via the ROVP pin.

When the LED drive control circuit works, a chip signal of the LED drive control chip U1 controls the on and off of a primary coil of the transformer T1 through the 5 th pin and the 6 th pin of the built-in MOS; when the MOS built in the chip is switched on, the current on the primary coil of the transformer is linearly increased, the energy storage voltage of the inductor starts to be positive and negative, and at the moment, the secondary output circuit D5 is cut off to output power to supply power to the LED lamp through the EC5 capacitor; at the moment, the chip detects the peak current of the primary side of the transformer cycle by cycle, when an internal detection threshold value is reached, the built-in MOS of the chip is cut off, the current of the primary coil of the transformer is cut off, a loop is formed by the absorption circuits D4, R4, C2 and R5, negative voltage and positive voltage are generated, magnetic field energy in the transformer is conducted through the secondary winding of the transformer T1 and the ultrafast recovery diode D5 at the moment, and power is supplied to the output LED and the output electrolytic capacitor EC5 at the same time.

The working principle of the other branch is the same as that of the two branches, the two LED negative stages are respectively connected with the two LED lamps, and the two LED negative stages can also be connected through an R14 resistor, so that the working mode of common positive and common negative parallel output is realized.

The utility model has the characteristics of it is following: (1) the voltage 180-265V design is compatible with the requirements of power grids in different countries; (2) the long-life Hunan Aihua RS series aluminum electrolytic capacitor with the temperature of 105 ℃ being 10000 hours and the long service life is adopted, the aluminum electrolytic capacitor is used for a long time, is energy-saving and environment-friendly, and achieves the quality guarantee of 3 years (25000 hours); (3) the valley filling design, 180-265 voltage operation, high power factor, no stroboflash and safe isolation; (4) high-voltage lightning protection design.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a fill up millet and keep apart to flyback and merge LED circuit, its characterized in that, includes input rectifier circuit, input rectifier circuit has two outputs, every an LED drive circuit is all connected to the output, two LED drive circuit's circuit structure is the same, LED drive circuit is including filling millet circuit, LED drive control chip, transformer and the output rectification filter circuit who connects gradually, output rectification filter circuit includes the anodal output of LED and LED negative pole output, two the anodal output of LED of output rectification filter circuit connects.

2. The valley-fill isolation flyback combining LED circuit as claimed in claim 1, wherein the valley-fill circuit comprises a first diode, a second diode, a third diode, a first resistor, a first electrolytic capacitor and a second electrolytic capacitor, the anode of the output end of the input rectification circuit is connected with the second electrolytic capacitor and the first end of the second diode in sequence, the second end of the second electrolytic capacitor is grounded through the first diode, the second end of the second diode is grounded through the first electrolytic capacitor, and the second end of the second electrolytic capacitor is connected with the second end of the second diode in sequence through the third diode and the first resistor.

3. The valley-fill isolation flyback merging LED circuit as claimed in claim 2, wherein the LED driving control chip is in a type of BP3167FH, the first end of the second diode is connected with the 4 th pin of the LED driving control chip through a second resistor, and the 5 th and 6 th pins of the LED driving control chip are connected with the primary coil of the transformer.

4. The valley-fill isolated flyback combining LED circuit of claim 3, wherein the output rectifier filter circuit is connected to the secondary winding of the transformer.