A single-stage high power factor non-jitter LED isolated driver

Abstract

The utility model discloses a single-stage high power factor non-jittering LED isolated driving power supply, comprising a first filtering module, a second filtering module, a third filtering module, a feedback module, a transformer T1, a main control chip U2 and a MOS tube Q2; through the above structure, the COMP end of the main control chip U2 can directly obtain a signal from the FB end of the main control chip U2 through the third filtering module, the path is the shortest, there is no intermediate operation circuit delay, and the speed is the fastest, thereby improving the response speed of the LED power supply, quickly responding to and suppressing the disturbance ripple of the input and output, and eliminating the jitter phenomenon.

Description

Technical Field

[0001] The utility model relates to the field of LED power supplies, in particular to a single-stage high power factor non-dithering LED isolation driving power supply. Background Art

[0002] LED lights are becoming more and more popular in people's lives, and the corresponding LED driver power supply is also booming. For LED driver power supplies, power above 5W must have a high power factor. Single-stage high power factor LED isolation driver power supplies have slow response speed and high output ripple. When light load is light, the light jitter is visible to the naked eye, that is, the light jitter phenomenon, which makes the LED power supply unusable. The solution of the prior art is to adopt a two-stage structure, the front stage is the power factor correction circuit part to increase the power factor, and the rear stage is the low power factor LED driver circuit part; but the above technical solutions have the following problems: 1. The product is bulky; 2. The product cost is very high; Therefore, there is an urgent need for a single-stage high power factor non-light jitter LED isolation driver power supply to solve the above problems. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a single-stage high power factor non-dithering LED isolation driving power supply.

[0004] The technical solution adopted by an embodiment of the utility model to solve the technical problem is: a single-stage high power factor non-light-jitter LED isolation driving power supply, including a first filter module, a second filter module, a third filter module, a feedback module, a transformer T1, a main control chip U2 and a MOS tube Q2;

[0005] The input end of the first filter module is connected to an external power supply;

[0006] The transformer T1 has an Np winding, an Ns winding and a Na winding, one end of the Np winding is respectively connected to the output end of the first filter module and the VCC end of the main control chip U2, the other end of the Np winding is connected to the drain of the MOS tube Q2, the gate of the MOS tube Q2 is connected to the OUT end of the main control chip U2, and the source of the MOS tube Q2 is connected to the GND0 end;

[0007] The second filter module is connected between the Ns winding and the load;

[0008] One end of the third filter module is connected to the FB end of the main control chip U2 and one end of the Na winding respectively, and the other end of the third filter module is connected to the COMP end and the GND end of the main control chip U2 respectively;

[0009] The feedback module is connected between the Ns winding and the VCC terminal of the main control chip U2.

[0010] As one of the preferred embodiments of the utility model, the first filtering module includes a fuse F1, a varistor MOV1, a varistor RV1, a rectifier bridge BD1, a resistor R1, a resistor R25-26, a capacitor C1-2, a capacitor CX1-2, an inductor L1 and an inductor LF2-3, one end of the fuse F1 is connected to one end of the external power supply, the other end of the fuse F1 is respectively connected to one end of the varistor MOV1 and one end of the varistor RV1, the other end of the varistor MOV1 is respectively connected to the first end of the inductor LF3 and the other end of the external power supply, the other end of the varistor RV1 is connected to the second end of the inductor LF3, the third end of the inductor LF3 is respectively connected to one end of the capacitor CX2 and one end of the resistor R25-26. The fourth end of the inductor LF3 is respectively connected to the other end of the capacitor CX2, one end of the resistor R26, the other end of the capacitor CX1 and the first end of the inductor LF2, the other end of the resistor R25 is connected to the other end of the resistor R26, the third end of the inductor LF2 and the fourth end of the inductor LF2 are connected to the first input end and the second input end of the rectifier bridge BD1, the first output end of the rectifier bridge BD1 is respectively connected to one end of the capacitor C1, one end of the inductor L1 and one end of the resistor R1, the other end of the resistor R1 is respectively connected to the other end of the inductor L1, one end of the capacitor C2 and the post-stage circuit, and the other end of the capacitor C2 is respectively connected to the other end of the capacitor C1, the second output end of the rectifier bridge BD 1 and the GND0 end.

[0011] As one of the preferred embodiments of the utility model, the second filtering module includes a resistor R14, a resistor R20, a capacitor C5, a capacitor C8, a capacitor E3-4, an inductor LF1 and a diode D8, one end of the resistor R20 is respectively connected to the cathode of the diode D8 and one end of the Ns winding, the other end of the resistor R20 is respectively connected to the anode of the diode D8, one end of the capacitor E3, one end of the capacitor E4, one end of the capacitor C5, one end of the resistor R14, the first end of the inductor LF1 and the SGND end through the capacitor C8, the other end of the capacitor E3, the other end of the capacitor E4, the other end of the capacitor C5, the other end of the resistor R14 and the second end of the inductor LF1 are connected to the other end of the Ns winding, and the load is connected to the third end of the inductor LF 1 and the fourth end of the inductor LF1.

[0012] As one of the preferred embodiments of the utility model, the third filtering module includes a capacitor C19, a capacitor C22 and a resistor R47, one end of the capacitor C19 is respectively connected to one end of the capacitor C22, the FB end of the main control chip U2 and one end of the Na winding, and the other end of the capacitor C19 is respectively connected to the other end of the capacitor C22, the COMP end and the GND end of the main control chip U2 via the resistor R47.

[0013] As one of the preferred embodiments of the utility model, a single-stage high power factor jitter-free LED isolation driving power supply also includes a spike absorption module having one end connected to one end of the Np winding and the output end of the first filter module, and the other end connected to the other end of the Np winding and the drain of the MOS tube Q2.

[0014] As one of the preferred embodiments of the utility model, the peak absorption module includes resistors R4-5, resistors R10-11, resistor R16, capacitor C6 and diode D4, one end of the resistor R4 is respectively connected to one end of the resistor R10, one end of the capacitor C6, one end of the Np winding and the output end of the first filtering module, the other end of the resistor R4 is respectively connected to one end of the resistor R5, one end of the resistor R11, one end of the resistor R16, the other end of the resistor R10 and the other end of the capacitor C6, the other end of the resistor R5, the other end of the resistor R11 and the other end of the resistor R16 are connected to the cathode of the diode D4, and the anode of the diode D4 is respectively connected to the other end of the Np winding and the drain of the MOS tube Q2.

[0015] The beneficial effects of the utility model are as follows: a single-stage high power factor non-jitter LED isolated driving power supply comprises a first filter module, a second filter module, a third filter module, a feedback module, a transformer T1, a main control chip U2 and a MOS tube Q2; the input end of the first filter module is connected to an external power supply; the transformer T1 has an Np winding, an Ns winding and a Na winding, one end of the Np winding is respectively connected to the output end of the first filter module and the VCC end of the main control chip U2, the other end of the Np winding is connected to the drain of the MOS tube Q2, the gate of the MOS tube Q2 is connected to the OUT end of the main control chip U2, and the source of the MOS tube Q2 is connected to the GND0 end; The second filter module is connected between the Ns winding and the load; one end of the third filter module is respectively connected to the FB end of the main control chip U2 and one end of the Na winding, and the other end of the third filter module is respectively connected to the COMP end and the GND end of the main control chip U2; the feedback module is connected between the Ns winding and the VCC end of the main control chip U2; through the above structure, the COMP end of the main control chip U2 can directly obtain the signal from the FB end of the main control chip U2 through the third filter module, with the shortest path, no intermediate operation circuit delay, and the fastest speed, thereby improving the response speed of the LED power supply, quickly responding to and suppressing the disturbance ripple of the input and output, and eliminating the light jitter phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 The circuit schematic diagram of a single-stage high power factor non-jitter LED isolated driving power supply is shown in FIG.

[0018] Figure 2 is a circuit schematic diagram of the first filtering module;

[0019] Figure 3 for Figure 1 A partial enlarged view of the middle A area;

[0020] Figure 4 for Figure 1 A partial enlarged view of the middle B area;

[0021] Figure 5 is a circuit schematic diagram of the second filtering module;

[0022] Figure 6 is a circuit schematic diagram of the third filtering module;

[0023] Figure 7 It is the circuit schematic diagram of the feedback module;

[0024] Figure 8 This is the circuit schematic diagram of the spike absorption module. DETAILED DESCRIPTION

[0025] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0026] In the description of the present utility model, the meaning of "more than" is more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0027] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0029] Reference Figures 1 to 8 A single-stage high power factor non-jitter LED isolation driving power supply includes a first filter module 10, a second filter module 20, a third filter module 30, a feedback module 40, a transformer T1, a main control chip U2 and a MOS tube Q2;

[0030] The input end of the first filter module 10 is connected to an external power supply;

[0031] The transformer T1 has an Np winding, an Ns winding and a Na winding, one end of the Np winding is respectively connected to the output end of the first filter module 10 and the VCC end of the main control chip U2, the other end of the Np winding is connected to the drain of the MOS tube Q2, the gate of the MOS tube Q2 is connected to the OUT end of the main control chip U2, and the source of the MOS tube Q2 is connected to the GND0 end;

[0032] The second filter module 20 is connected between the Ns winding and the load;

[0033] One end of the third filter module 30 is connected to the FB end of the main control chip U2 and one end of the Na winding respectively, and the other end of the third filter module 30 is connected to the COMP end and the GND end of the main control chip U2 respectively;

[0034] The feedback module 40 is connected between the Ns winding and the VCC terminal of the main control chip U2.

[0035] ① In the present utility model, the voltage input by the external power supply is filtered and rectified by the first filtering module 10 to provide a high-quality working voltage for the subsequent circuit. Specifically, the first filtering module 10 includes a fuse F1, a varistor MOV1, a varistor RV1, a rectifier bridge BD1, a resistor R1, resistors R25-26, a capacitor C1-2, a capacitor CX1-2, an inductor L1 and an inductor LF2-3. One end of the fuse F1 is connected to one end of the external power supply, and the other end of the fuse F1 is respectively connected to one end of the varistor MOV1 and one end of the varistor RV1. The other end of the varistor MOV1 is connected to the inductor L1 and the inductor LF2-3. One end is respectively connected to the first end of the inductor LF3 and the other end of the external power supply, the other end of the varistor RV1 is connected to the second end of the inductor LF3, the third end of the inductor LF3 is respectively connected to one end of the capacitor CX2, one end of the resistor R25, one end of the capacitor CX1 and the second end of the inductor LF2, the fourth end of the inductor LF3 is respectively connected to the other end of the capacitor CX2, one end of the resistor R26, the other end of the capacitor CX1 and the first end of the inductor LF2, the other end of the resistor R25 is connected to the other end of the resistor R26, the third end of the inductor LF2 and the fourth end of the inductor LF2 are connected to the rectifier bridge BD 1 is connected to the first input terminal and the second input terminal of 1, the first output terminal of the rectifier bridge BD1 is respectively connected to one end of the capacitor C1, one end of the inductor L1 and one end of the resistor R1, the other end of the resistor R1 is respectively connected to the other end of the inductor L1, one end of the capacitor C2 and the post-stage circuit, the other end of the capacitor C2 is respectively connected to the other end of the capacitor C1, the second output terminal of the rectifier bridge BD1 and the GND0 terminal; wherein, the inductor LF2-3 is a common-mode inductor.

[0036] ② The voltage output by the first filtering module 10 is connected to the VCC terminal of the main control chip U2 through the resistor R8, the resistor R13, the resistor R17, the capacitor C10 and the capacitor E6, and the internal circuit of the main control chip U2 is charged through the high-voltage startup circuit inside the main control chip U2. After reaching the startup voltage, the main control chip U2 starts to start, and the main control chip U2 outputs a driving signal to turn on the MOS tube Q2 through the resistors R44-46 and the diode D9. After the MOS tube Q2 is turned on, it drives the transformer T1. The Ns winding of the transformer T1 is filtered by the second filtering module 20 and output to the load. Specifically, the second filtering module 20 includes a resistor R14, a resistor R20, a capacitor C5, a capacitor C8, a capacitor E3-4, and an inductor LF 1 and diode D8, one end of the resistor R20 is respectively connected to the cathode of the diode D8 and one end of the Ns winding, the other end of the resistor R20 is respectively connected to the anode of the diode D8, one end of the capacitor E3, one end of the capacitor E4, one end of the capacitor C5, one end of the resistor R14, the first end of the inductor LF1 and the SGND end through the capacitor C8, the other end of the capacitor E3, the other end of the capacitor E4, the other end of the capacitor C5, the other end of the resistor R14 and the second end of the inductor LF1 are connected to the other end of the Ns winding, and the load is connected to the third end of the inductor LF1 and the fourth end of the inductor LF1.

[0037] ③ The feedback module 40 is connected between the Ns winding of the transformer T1 and the VCC terminal of the main control chip U2, and is used to detect and feedback the output of the LED power supply, wherein U3A and U4B constitute an optocoupler;

[0038] ④ As a preference, a third filtering module 30 is set between the FB end of the main control chip U2 and the COMP end of the main control chip U2. Specifically, the third filtering module 30 includes a capacitor C19, a capacitor C22 and a resistor R47. One end of the capacitor C19 is respectively connected to one end of the capacitor C22, the FB end of the main control chip U2 and one end of the Na winding, and the other end of the capacitor C19 is respectively connected to the other end of the capacitor C22, the COMP end of the main control chip U2 and the GND end via the resistor R47. The COMP end of the main control chip U2 can directly obtain a signal from the FB end of the main control chip U2 through the third filtering module 30, with the shortest path, no intermediate operation circuit delay and the fastest speed, thereby improving the response speed of the LED power supply, quickly responding to and suppressing the disturbance ripple of the input and output, and eliminating the light jitter phenomenon.

[0039] A single-stage high power factor light-jitter-free LED isolation driving power supply also includes a spike absorption module 50 having one end connected to one end of the Np winding and the output end of the first filter module 10, and the other end connected to the other end of the Np winding and the drain of the MOS tube Q2.

[0040] As a preferred embodiment of the peak absorption module 50, the peak absorption module 50 includes resistors R4-5, resistors R10-11, resistor R16, capacitor C6 and diode D4, one end of the resistor R4 is respectively connected to one end of the resistor R10, one end of the capacitor C6, one end of the Np winding and the output end of the first filtering module 10, the other end of the resistor R4 is respectively connected to one end of the resistor R5, one end of the resistor R11, one end of the resistor R16, the other end of the resistor R10 and the other end of the capacitor C6, the other end of the resistor R5, the other end of the resistor R11 and the other end of the resistor R16 are connected to the cathode of the diode D4, and the anode of the diode D4 is respectively connected to the other end of the Np winding and the drain of the MOS tube Q2; it can control the transient spikes caused by the rapid rise and fall of the MOS tube Q2, prevent device damage, reduce EMI, and improve efficiency and reliability.

[0041] Of course, the present invention is not limited to the above-mentioned embodiments, and technicians familiar with the field may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications and substitutions are all included in the scope defined by the claims of this application.

Claims

1. A single-stage high power factor non-jitter LED isolated driving power supply, characterized in that: It comprises a first filtering module (10), a second filtering module (20), a third filtering module (30), a feedback module (40), a transformer T1, a main control chip U2 and a MOS tube Q2; The input end of the first filter module (10) is connected to an external power supply; The transformer T1 comprises an Np winding, an Ns winding and a Na winding, one end of the Np winding is respectively connected to the output end of the first filter module (10) and the VCC end of the main control chip U2, the other end of the Np winding is connected to the drain of the MOS tube Q2, the gate of the MOS tube Q2 is connected to the OUT end of the main control chip U2, and the source of the MOS tube Q2 is connected to the GND0 end; The second filtering module (20) is connected between the Ns winding and the load; One end of the third filter module (30) is respectively connected to the FB end of the main control chip U2 and one end of the Na winding, and the other end of the third filter module (30) is respectively connected to the COMP end and the GND end of the main control chip U2; The feedback module (40) is connected between the Ns winding and the VCC terminal of the main control chip U2.

2. According to claim 1, a single-stage high power factor light-dimming-free LED isolated driving power supply is characterized in that: The first filtering module (10) comprises a fuse F1, a varistor MOV1, a varistor RV1, a rectifier bridge BD1, a resistor R1, resistors R25-26, capacitors C1-2, capacitors CX1-2, inductors L1 and inductors LF2-3, one end of the fuse F1 is connected to one end of an external power supply, the other end of the fuse F1 is respectively connected to one end of the varistor MOV1 and one end of the varistor RV1, the other end of the varistor MOV1 is respectively connected to a first end of the inductor LF3 and the other end of the external power supply, the other end of the varistor RV1 is connected to a second end of the inductor LF3, the third end of the inductor LF3 is respectively connected to one end of the capacitor CX2, one end of the resistor R25, and the capacitor C1-2. One end of X1 is connected to the second end of the inductor LF2, the fourth end of the inductor LF3 is respectively connected to the other end of the capacitor CX2, one end of the resistor R26, the other end of the capacitor CX1 and the first end of the inductor LF2, the other end of the resistor R25 is connected to the other end of the resistor R26, the third end of the inductor LF2 and the fourth end of the inductor LF2 are connected to the first input end and the second input end of the rectifier bridge BD1, the first output end of the rectifier bridge BD1 is respectively connected to one end of the capacitor C1, one end of the inductor L1 and one end of the resistor R1, the other end of the resistor R1 is respectively connected to the other end of the inductor L1, one end of the capacitor C2 and the subsequent circuit, the other end of the capacitor C2 is respectively connected to the other end of the capacitor C1, the second output end of the rectifier bridge BD 1 and the GND0 end.

3. According to claim 1, a single-stage high power factor light-dimming-free LED isolated driving power supply is characterized in that: The second filtering module (20) comprises a resistor R14, a resistor R20, a capacitor C5, a capacitor C8, a capacitor E3-4, an inductor LF1 and a diode D8, one end of the resistor R20 is respectively connected to the cathode of the diode D8 and one end of the Ns winding, the other end of the resistor R20 is respectively connected to the anode of the diode D8, one end of the capacitor E3, one end of the capacitor E4, one end of the capacitor C5, one end of the resistor R14, the first end of the inductor LF1 and the SGND end through the capacitor C8, the other end of the capacitor E3, the other end of the capacitor E4, the other end of the capacitor C5, the other end of the resistor R14 and the second end of the inductor LF1 are connected to the other end of the Ns winding, and the load is connected to the third end of the inductor LF1 and the fourth end of the inductor LF1.

4. The single-stage high power factor non-light-jitter LED isolated driving power supply according to claim 1, characterized in that: The third filtering module (30) comprises a capacitor C19, a capacitor C22 and a resistor R47, one end of the capacitor C19 is respectively connected to one end of the capacitor C22, the FB end of the main control chip U2 and one end of the Na winding, and the other end of the capacitor C19 is respectively connected to the other end of the capacitor C22, the COMP end and the GND end of the main control chip U2 via the resistor R47.

5. The single-stage high power factor light-dimming-free LED isolated driving power supply according to claim 1, characterized in that: It also comprises a peak absorption module (50) having one end connected to one end of the Np winding and the output end of the first filter module (10) and the other end connected to the other end of the Np winding and the drain of the MOS tube Q2.

6. The single-stage high power factor light-dimming-free LED isolated driving power supply according to claim 5, characterized in that: The peak absorption module (50) comprises resistors R4-5, resistors R10-11, resistor R16, capacitor C6 and diode D4; one end of the resistor R4 is respectively connected to one end of the resistor R10, one end of the capacitor C6, one end of the Np winding and the output end of the first filtering module (10); the other end of the resistor R4 is respectively connected to one end of the resistor R5, one end of the resistor R11, one end of the resistor R16, the other end of the resistor R10 and the other end of the capacitor C6; the other end of the resistor R5, the other end of the resistor R11 and the other end of the resistor R16 are connected to the cathode of the diode D4; the anode of the diode D4 is respectively connected to the other end of the Np winding and the drain of the MOS tube Q2.

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