CN217011250U

CN217011250U - Non-polar T10LED light source circuit

Info

Publication number: CN217011250U
Application number: CN202121266076.0U
Authority: CN
Inventors: 徐振雷
Original assignee: Dongguan Xinguiyuan Semiconductor Technology Co ltd
Current assignee: Dongguan Xinguiyuan Semiconductor Technology Co ltd
Priority date: 2021-06-07
Filing date: 2021-06-07
Publication date: 2022-07-19
Anticipated expiration: 2031-06-07

Abstract

The utility model relates to the technical field of LED light sources, in particular to a nonpolar T10LED light source circuit, which comprises a filtering anti-surge rectifying circuit, a pi-shaped filtering circuit, a control circuit for non-isolated LED drive and a ripple eliminating circuit, wherein the filtering anti-surge rectifying circuit, the pi-shaped filtering circuit, the control circuit and the ripple eliminating circuit are electrically connected in sequence; the control circuit for non-isolated LED driving is composed of a main control chip U1, a resistor R2, a resistor R3, a resistor R4, a resistor R5a, a resistor R5b, a resistor R7, a resistor R8a, a resistor R8b, a resistor R8C, a resistor R9, a resistor R14, a capacitor EC1, a capacitor C1, a diode D1, a diode D2 and an inductor TR1, and high constant current precision and high input and output regulation rate are achieved. Meanwhile, the main control chip U1 is provided with PFC control, and the full-range high PF value is automatically realized.

Description

Non-polar T10LED light source circuit

Technical Field

The utility model relates to the technical field of LED light sources, in particular to a nonpolar T10LED light source circuit.

Background

Light Emitting Diodes (LEDs) are used as new Light sources, and have been widely used in various fields such as illumination, display, and signal indication due to their characteristics of energy saving, environmental protection, and high efficiency. At present, the visible light communication technology realized by using the LED light source has the characteristics of no need of radio frequency spectrum authentication, no electromagnetic interference, good confidentiality, no radiation and the like, can be applied to a plurality of specific scenes such as medical treatment, aerospace and the like, can obtain high accuracy in the application of a positioning system due to wide light source distribution, can become an important complementary technology of a WiFi communication technology in the current mainstream wireless communication due to a series of advantages, and can be applied to the field of illumination communication possibly based on the wide market prospect of the LED light source and the continuous maturity of the technology thereof. At present, no non-polar T10LED light source circuit exists.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides a non-polar T10LED light source circuit to achieve high constant current precision and high input/output regulation rate.

In order to solve the technical problems, the technical scheme adopted by the utility model is as follows:

a non-polar T10LED light source circuit is arranged between a mains supply and a T10LED and comprises a filtering anti-surge rectifying circuit, a pi-shaped filtering circuit, a control circuit for non-isolated LED driving and a ripple eliminating circuit which are sequentially and electrically connected, wherein the filtering anti-surge rectifying circuit is electrically connected with the mains supply, and the ripple eliminating circuit is electrically connected with the T10 LED;

the control circuit comprises a main control chip U1, a resistor R2, a resistor R3, a resistor R4, a resistor R5a, a resistor R5b, a resistor R7, a resistor R8a, a resistor R8b, a resistor R8C, a resistor R9, a resistor R14, a capacitor EC1, a capacitor C1, a capacitor C2, a diode D1, a diode D2 and an inductor TR 1;

a fifth pin and a sixth pin of the main control chip U1 are electrically connected to one end of a resistor R2 and to a pi-type filter circuit, the other end of the resistor R2 is electrically connected to one end of a resistor R3, the other end of the resistor R3 is electrically connected to one end of a capacitor EC1, one end of the resistor R9 and a first pin of the main control chip U1, the other end of the resistor R9 is electrically connected to a cathode of a diode D2, an anode of the diode D2 is electrically connected to one end of a resistor R5a, one end of a resistor R5b and an auxiliary winding of an inductor TR1, the other end of the resistor R5a is electrically connected to the other end of a resistor R5b, one end of a resistor R4 and a fourth pin of the main control chip U1, a third pin of the main control chip U1 is electrically connected to one end of a resistor R7, the other end of a resistor R7 is electrically connected to one end of a capacitor C2, and the other end of the capacitor C2, the other end of the capacitor EC1 and the other end of the resistor R4 are all connected to a signal ground;

a second pin of the main control chip U1 is electrically connected to one end of a resistor R8a, one end of a resistor R8b, one end of a resistor R8C and one end of an inductor TR1, the other end of the resistor R8a, the other end of the resistor R8b, the other end of the resistor R8C, the cathode of a diode D1, one end of a resistor R14 and a seventh pin of the main control chip U1 are all connected to signal ground, the other end of the resistor R14 is electrically connected to one end of a capacitor C1, and the anode of the diode D1 and the other end of the capacitor C1 are all connected to ground; the other end of the inductor TR1 is electrically connected with the ripple elimination circuit.

Further, the pi-type filter circuit comprises a voltage dependent resistor MOV2, a capacitor CD1, a capacitor CD2, an inductor L1 and a resistor R1;

one end of the voltage dependent resistor MOV2, one end of the capacitor CD1, one end of the inductor L1 and one end of the resistor R1 are respectively and electrically connected with the filtering anti-surge rectifying circuit, the other end of the inductor L1, the other end of the resistor R1 and one end of the capacitor CD2 are respectively and electrically connected with one end of the resistor R2, and the other end of the voltage dependent resistor MOV2, the other end of the capacitor CD1 and the other end of the capacitor CD2 are all grounded.

Further, the filtering anti-surge rectifying circuit comprises a voltage dependent resistor MOV1, a capacitor CX1, a common mode inductor LF1 and a rectifier bridge DB 1; the live wire of commercial power is connected with the third pin electricity of piezo-resistor MOV1 one end, electric capacity CX1 one end and common mode inductance LF1 respectively, and the zero line of commercial power is connected with the second pin electricity of the piezo-resistor MOV1 other end, electric capacity CX1 other end and common mode inductance LF1 respectively, common mode inductance LF 1's fourth pin is connected with rectifier bridge DB 1's second pin electricity, common mode inductance LF 1's first pin is connected with rectifier bridge DB 1's third pin electricity, rectifier bridge DB 1's fourth pin ground connection, rectifier bridge DB 1's first pin is connected with piezo-resistor MOV2 one end electricity.

Further, the filtering anti-surge rectifying circuit further comprises a fuse F1; the live wire of commercial power passes through fuse F1 and is connected with varistor MOV1 one end, electric capacity CX1 one end and common mode inductance LF 1's third pin electricity respectively.

Further, the ripple elimination circuit comprises a capacitor EC2, a capacitor EC3, a capacitor EC4, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a diode D3 and a triode Q1;

the other end of the inductor TR1 is respectively electrically connected with one end of a capacitor EC2, one end of a capacitor EC3, one end of a resistor R10, one end of a resistor R11, one end of a resistor R13 and a collector of the triode Q1, and the other end of the capacitor EC2, the other end of the capacitor EC3 and the other end of the resistor R13 are all grounded; the other end of the resistor R10 is electrically connected with one end of a resistor R12 and one end of a capacitor EC4 respectively, the other end of the capacitor EC4 is grounded, the other end of the resistor R11 is electrically connected with the cathode of a diode D3, the anode of the diode D3 is electrically connected with the base of a triode Q1 and the other end of the resistor R12 respectively, the emitting electrode of the triode Q1 is electrically connected with the anode of the T10LED, and the cathode of the T10LED is grounded.

The utility model has the beneficial effects that:

the utility model provides a nonpolar T10LED light source circuit, which achieves high constant current precision and high input and output regulation rate through a control circuit for non-isolated LED drive, wherein the control circuit consists of a main control chip U1, a resistor R2, a resistor R3, a resistor R4, a resistor R5a, a resistor R5b, a resistor R7, a resistor R8a, a resistor R8b, a resistor R8C, a resistor R9, a resistor R14, a capacitor EC1, a capacitor C1, a diode D1, a diode D2 and an inductor TR 1. Meanwhile, the main control chip U1 is provided with PFC control, and the full-range high PF value is automatically realized.

Drawings

Fig. 1 is a circuit diagram of a non-polar T10LED light source circuit according to the present invention.

Detailed Description

In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.

Referring to fig. 1, the non-polar T10LED light source circuit of the present invention is disposed between a commercial power and a T10LED, and includes a filtering anti-surge rectifying circuit, a pi-type filtering circuit, a control circuit for non-isolated LED driving, and a ripple cancellation circuit, which are electrically connected in sequence, wherein the filtering anti-surge rectifying circuit is electrically connected to the commercial power, and the ripple cancellation circuit is electrically connected to the T10 LED;

in this embodiment, the model of the main control chip U1 is SD6924S, the resistances of the resistor R2 and the resistor R3 are 240K Ω/5%, the resistance of the resistor R4 is 33K Ω/1%, the resistances of the resistor R5a and the resistor R5b are 270K Ω/1%, the resistance of the resistor R7 is 1K Ω/5%, the resistances of the resistor R8a, the resistors R8b and the resistor R8C are 2R/1%, the resistance of the resistor R9 is 33R/1%, the resistance of the resistor R14 is 33R/1W, the specification of the capacitor EC1 is 22 μ F/50V, the specification of the capacitor C1 is 102/1KV, the specification of the capacitor C2 is 225/25V, the model of the diode D1 is 28, the model of the diode D2 is BAV21W, and the model of the inductor TR1 is SF 13.

A fifth pin (DRA) and a sixth pin (DRA) of the main control chip U1 are both electrically connected with one end of a resistor R2 and are electrically connected with a pi-type filter circuit, the other end of the resistor R2 is electrically connected with one end of a resistor R3, the other end of the resistor R3 is electrically connected with one end of a capacitor EC1, one end of a resistor R9 and a first pin (VCC) of a main control chip U1 respectively, the other end of the resistor R9 is electrically connected with the cathode of a diode D2, the anode of the diode D2 is respectively and electrically connected with one end of a resistor R5a, one end of a resistor R5b and an auxiliary winding of an inductor TR1, the other end of the resistor R5a is respectively and electrically connected with the other end of the resistor R5b, one end of the resistor R4 and a fourth pin (ZCD) of the main control chip U1, a third pin (COMP) of the main control chip U1 is electrically connected with one end of a resistor R7, the other end of the resistor R7 is electrically connected with one end of a capacitor C2, the other end of the capacitor C2, the other end of the capacitor EC1 and the other end of the resistor R4 are all connected with a signal ground;

a second pin (CS) of the main control chip U1 is electrically connected to one end of a resistor R8a, one end of a resistor R8b, one end of a resistor R8C, and one end of an inductor TR1, respectively, the other end of the resistor R8a, the other end of the resistor R8b, the other end of the resistor R8C, a cathode of a diode D1, one end of a resistor R14, and a seventh pin (SGND) of the main control chip U1 are all connected to a signal ground, the other end of the resistor R14 is electrically connected to one end of a capacitor C1, and an anode of the diode D1 and the other end of the capacitor C1 are all connected to a ground; the other end of the inductor TR1 is electrically connected with the ripple elimination circuit.

The working principle of the control circuit is as follows:

the main control chip is SD6924S, is a control chip specially used for non-isolated LED drive, the periphery adopts a floating Buck framework, a 600V high-voltage power MOS is arranged in the control chip, under the framework, the current of the chip sampling inductor enters the interior, and a closed-loop feedback network is formed by utilizing an internal error amplifier, so that high constant current precision and high input and output regulation rate are achieved. Meanwhile, the chip is provided with PFC control, and the full-range high PF value is automatically realized.

R2, R3 constitute starting circuit to charge EC1, after the chip works, an auxiliary winding of the inductor can supply power to the chip through D2 and R9, thereby realizing self-power supply, meanwhile, the winding is also used as ZCD sampling to be input to SD6924S through a signal obtained by connecting R5a, R5b in parallel and then connecting R4 in series, and a higher PF value is obtained through ZCD control in the chip. R8a, R8b and R8c are used as sampling resistors, and the current passing through the resistors is collected, so that the output current can be accurately controlled. D1 is the main power element of BUCK, and R14 and C1 filter the spike on D1, prevent the peak-reversal voltage from being too high, and also are better to EMC radiation at the same time. TR1 is used as the main inductance of the BUCK circuit, EC2 and EC3 are used as the filter capacitance of the BUCK circuit, thereby outputting comparatively stable voltage and current, but because high P is needed, the front end does not have large electrolytic capacitance, and a power frequency ripple of 50HZ exists.

The pi-type filter circuit comprises a voltage dependent resistor MOV2, a capacitor CD1, a capacitor CD2, an inductor L1 and a resistor R1;

in this embodiment, the model of the voltage dependent resistor MOV2 is 10D471K, the specifications of the capacitor CD1 and the capacitor CD2 are both 104/400V, the model of the inductor L1 is L-I1012, and the resistance of the resistor R1 is 5.6K Ω/5%.

In the pi filter circuit described above, L1, CD1, and CD2 constitute pi filtering, contributing to radiation and conduction.

The filtering anti-surge rectifying circuit comprises a voltage dependent resistor MOV1, a capacitor CX1, a common mode inductor LF1 and a rectifying bridge DB 1; the live wire of commercial power is connected with the third pin electricity of piezo-resistor MOV1 one end, electric capacity CX1 one end and common mode inductance LF1 respectively, and the zero line of commercial power is connected with the second pin electricity of the piezo-resistor MOV1 other end, electric capacity CX1 other end and common mode inductance LF1 respectively, common mode inductance LF 1's fourth pin is connected with rectifier bridge DB 1's second pin electricity, common mode inductance LF 1's first pin is connected with rectifier bridge DB 1's third pin electricity, rectifier bridge DB 1's fourth pin ground connection, rectifier bridge DB 1's first pin is connected with piezo-resistor MOV2 one end electricity. The filtering anti-surge rectifying circuit further comprises a fuse F1; the live wire of commercial power passes through fuse F1 and is connected with piezo-resistor MOV1 one end, electric capacity CX1 one end and common mode inductance LF 1's third pin electricity respectively.

In the embodiment, the model of the voltage dependent resistor MOV1 is 10D471K, the specification of the capacitor CX1 is 154/275VAC, the model of the common mode inductor LF1 is L-R090503, the model of the rectifier bridge DB1 is UBS10, and the model of the fuse F1 is T1A-250V.

In the filtering anti-surge rectifying circuit, the F1 is a fuse which can prevent a rear short circuit and protect the whole circuit; MOV1 is a voltage dependent resistor, mainly used for lightning protection; CX1 is X capacitance, helps to conduct and radiate when EMC passes; LF1 is a common mode inductor, contributing to conduction and radiation at over EMC; UBS10 is a bridge rectifier that rectifies the AC alternating current.

The ripple elimination circuit comprises a capacitor EC2, a capacitor EC3, a capacitor EC4, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a diode D3 and a triode Q1;

in this embodiment, the specification of the capacitor EC2 is 220 μ F/100V, the specification of the capacitor EC3 is 100 μ F/100V, the specification of the capacitor EC4 is 100 μ F/100V, the resistance of the resistor R10 is 100R/5%, the resistance of the resistor R11 is 33R/5%, the resistance of the resistor R12 is 51R/5%, the resistance of the resistor R13 is 68K Ω/5%, the model of the diode D3 is BZT52CV4V7, and the model of the triode Q1 is TIP41 CL.

In the ripple eliminating circuit, R13 is a dummy load, the following circuit is a ripple eliminating circuit, Q1 is a triode with a large amplification factor, EC4 is charged through R10, because EC4 is large electrolysis, the voltage at two ends of an electrolytic capacitor cannot be suddenly changed, and the amplification effect of the triode is added, so that the output voltage is stable, the ripple is consumed on Q1, the output low ripple is obtained, and the R11 and a D3 voltage stabilizing tube have a protection effect on Q1.

In conclusion, the nonpolar T10LED light source circuit provided by the utility model can output low ripple while achieving a high PF value, can reduce harmonic interference, and can effectively remove stroboflash due to the low ripple, thereby having a better protective effect on eyes.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.

Claims

1. A non-polar T10LED light source circuit is arranged between a mains supply and a T10LED and is characterized by comprising a filtering anti-surge rectifying circuit, a pi-shaped filtering circuit, a control circuit for non-isolated LED drive and a ripple eliminating circuit which are sequentially and electrically connected, wherein the filtering anti-surge rectifying circuit is electrically connected with the mains supply, and the ripple eliminating circuit is electrically connected with the T10 LED;

2. The non-polar T10LED light source circuit as claimed in claim 1, wherein the pi filter circuit comprises a voltage dependent resistor MOV2, a capacitor CD1, a capacitor CD2, an inductor L1 and a resistor R1;

3. The non-polar T10LED light source circuit according to claim 2, wherein the filtering anti-surge rectifying circuit comprises a voltage dependent resistor MOV1, a capacitor CX1, a common mode inductor LF1 and a rectifier bridge DB 1; the live wire of commercial power is connected with piezo-resistor MOV1 one end, electric capacity CX1 one end and common mode inductance LF 1's third pin electricity respectively, and the zero line of commercial power is connected with the second pin electricity of the piezo-resistor MOV1 other end, the electric capacity CX1 other end and common mode inductance LF1 respectively, common mode inductance LF 1's fourth pin is connected with rectifier bridge DB 1's second pin electricity, common mode inductance LF 1's first pin is connected with rectifier bridge DB 1's third pin electricity, rectifier bridge DB 1's fourth pin ground connection, rectifier bridge DB 1's first pin is connected with piezo-resistor MOV2 one end electricity.

4. A non-polar T10LED light source circuit as claimed in claim 3, wherein said filter anti-surge rectification circuit further comprises fuse F1; the live wire of commercial power passes through fuse F1 and is connected with piezo-resistor MOV1 one end, electric capacity CX1 one end and common mode inductance LF 1's third pin electricity respectively.

5. The non-polar T10LED light source circuit as claimed in claim 1, wherein the ripple elimination circuit comprises a capacitor EC2, a capacitor EC3, a capacitor EC4, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a diode D3 and a transistor Q1;