Multi-output LED driving power supply

Abstract

The utility model discloses a multipath output LED driving power supply, comprising a filter circuit, a rectification circuit, a power factor correction circuit, an LLC resonance circuit, at least two DC-DC output circuits and a light modulation control circuit, an input end of the filter circuit is connected with an external power supply, an output end of the filter circuit is connected with an input end of the rectification circuit, and an output end of the rectification circuit is connected with an output end of the LLC resonance circuit. The output end of the rectification circuit is connected with the power factor correction circuit, the output end of the power factor correction circuit is connected with the LLC resonance circuit, the input ends of the at least two DC-DC output circuits are connected in parallel and then connected with the output end of the LLC resonance circuit, and the dimming control circuit is connected with the at least two DC-DC output circuits. According to the utility model, multi-path stable and controllable output is realized, and the circuit performance is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a power supply circuit, specifically a multi-output LED drive power supply. BACKGROUND

[0002] Compared with the traditional lighting mode, LED (light emitting diode) lighting has the outstanding advantages of high efficiency, energy saving, no pollution and long service life, is regarded as the "fourth generation of lighting light source", and has become a research hotspot in the lighting field in recent years, and has been widely applied in the lighting field such as street lighting, tunnel lighting and landscape lighting. In addition to being used as lighting, LED lamps are also used in other fields, such as supplementing light in the plant growth process to promote the growth of plants.

[0003] The driving of the LED lamp needs a driving power supply, and at present, most driving power supplies are single-output, the output voltage of which can be adjusted within a certain range, and generally have 0-10V / PWM dimming, but only one output can be met. In many occasions, there are more requirements for the control of LED lamps, and if each LED is equipped with a driving power supply, the cost and occupied space will be increased. SUMMARY

[0004] In order to solve the above technical problems, the application provides a multi-output LED drive power supply.

[0005] In order to solve the above technical problems, the application adopts the following technical scheme:

[0006] A multi-output LED drive power supply, comprising a filter circuit, a rectifier circuit, a power factor correction circuit, an LLC resonant circuit, at least two DC-DC output circuits and a dimming control circuit, the input end of the filter circuit is connected with an external power supply, the output end of the filter circuit is connected with the input end of the rectifier circuit, the output end of the rectifier circuit is connected with the power factor correction circuit, the output end of the power factor correction circuit is connected with the LLC resonant circuit, the input ends of the at least two DC-DC output circuits are connected in parallel and then connected with the output end of the LLC resonant circuit, and the dimming control circuit is connected with the at least two DC-DC output circuits respectively.

[0007] As a further improvement, the power factor correction circuit comprises a PFC controller, a triode Q1, a MOS tube Q2 and a MOS tube Q3, the base of the triode Q1 is connected with the PFC controller, the emitter of the triode Q1 is connected with the gate of the MOS tube Q2 and the gate of the MOS tube Q3 respectively, the collector of the triode Q1, the source of the MOS tube Q2 and the source of the MOS tube Q3 are connected and then grounded, the drain of the MOS tube Q2 and the drain of the MOS tube Q3 are connected and then connected with a diode D1, and the diode D1 is connected with the PFC controller through a fuse switch FB1.

[0008] As a further improvement, the diode D1 is connected in parallel with a diode D2 and a resistor R1 and a capacitor C1, the resistor R1 and the capacitor C1 are connected in series, the base of the triode Q1 is connected with the PFC controller through a resistor R2, the emitter of the triode Q1 is connected with a resistor R3 and a resistor R4, the resistor R3 is connected with the gate of the MOS Q2, the resistor R4 is connected with the gate of the MOS Q3, a diode D3 is connected in series between the resistor R2 and the resistor R3, the drain of the MOS Q2 and the drain of the MOS Q3 are connected and then connected with the rectifier circuit through the transformer T1, a capacitor group is connected between the diode D1 and the collector of the triode Q1.

[0009] As a further improvement, the resistor R5 is connected between the collector of the triode Q1 and the resistor R3, the resistor R6 is connected between the source and the drain of the MOS Q2, and the capacitor C2 is connected between the source and the drain of the MOS Q3.

[0010] As a further improvement, the LLC resonant circuit includes an LLC controller, a MOS Q4 and a MOS Q5, the gate of the MOS Q4 and the gate of the MOS Q5 are connected with the LLC controller respectively, the drain of the MOS Q4 is connected with the source of the MOS Q5, the source of the MOS Q4 is connected with the source of the MOS Q5 through the capacitor C9 and the primary of the transformer T4, the secondary of the transformer T4 outputs outward, the resistor R12 is connected between the gate and the source of the MOS Q4, the capacitor C10 is connected between the source and the drain of the MOS Q4, the resistor R13 is connected between the gate and the source of the MOS Q5, and the capacitor C11 is connected between the source and the drain of the MOS Q5.

[0011] As a further improvement, in the LLC resonant circuit, the transformer T3 has two secondaries, one of which is connected with the first group of diodes, and the other of which is connected with the second group of diodes, the first group of diodes includes the diode D6 and the diode D7 connected in parallel, the second group of diodes includes the diode D8 and the diode D9 connected in parallel, the capacitor C12 and the capacitor C13 are connected in parallel between the two secondaries of the transformer T3, the first group of diodes and the second group of diodes are connected and connected with the LLC controller.

[0012] As a further improvement, the DC-DC output circuit comprises a direct current conversion chip, the input side of the direct current conversion chip is connected with a light-dependent triode Q6, and the output side of the direct current conversion chip is connected with a MOS tube Q7; the anode of the light-dependent triode Q6 is connected with an electric resistance R14; the electric resistance R14 is connected with an electric resistance R15 in series; the gate of the MOS tube Q7 is connected with the direct current conversion chip through an electric resistance R16; the source of the MOS tube Q7 is grounded and connected with the direct current conversion chip; the drain of the MOS tube Q7 is connected with the output negative pole through an inductor L1; and the output positive pole is connected with the direct current conversion chip, and the drain of the MOS tube Q7 is connected to the output positive pole through a diode D10 and an electric resistance R17.

[0013] As a further improvement, the dimming control circuit comprises a dimming chip, and the dimming chip is connected with a light guide module.

[0014] As a further improvement, the light guide module comprises a triode Q8 and a light emitting diode; the base of the triode Q8 is connected with the dimming chip through an electric resistance R18; the anode of the triode Q8 is grounded and connected with the base of the triode Q8 through an electric resistance R19; and the light emitting diode is connected to the collector of the triode Q8.

[0015] As a further improvement, the light guide module is provided with a plurality of light guide modules, and the plurality of light guide modules are connected in parallel and connected with the dimming chip respectively.

[0016] Compared with the prior art, the utility model has the advantages of the following beneficial technical effects:

[0017] The power factor correction circuit is adopted, the purpose is to let input current follow input voltage, realize high PF value, filter and strengthen signal in combination with LLC resonant circuit, multiple direct current outputs, can control the light emission of multiple LED loads, and realize brightness adjustment in combination with the control of the dimming control circuit. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the principle framework schematic view of the utility model;

[0019] Figure 2 It is the connection principle schematic view of the PFC circuit in the utility model;

[0020] Figure 3 It is the connection principle schematic view of the LLC resonant circuit in the utility model;

[0021] Figure 4 It is the connection principle schematic view of the DC-DC output circuit in the utility model;

[0022] Figure 5 It is the connection principle schematic view of the dimming control circuit in the utility model. DETAILED DESCRIPTION

[0023] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar components are denoted by the same or similar reference numerals throughout the drawings. The embodiments described below are exemplary and are only intended to explain the present application, and should not be understood as limiting the present application.

[0024] In the description of the present application, it should be understood that, if there are terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicating the orientation or positional relationship, the orientation or positional relationship shown in the drawings is based on, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0025] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected. It can be mechanical connection, or electrical connection. It can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0026] Example one

[0027] Reference Figure 1 and 2As shown, a multi-output LED driving power supply includes a filter circuit, a rectifier circuit, a power factor correction circuit, an LLC resonant circuit, at least two DC-DC output circuits, and a dimming control circuit. The input end of the filter circuit is connected with an external power supply. The output end of the filter circuit is connected with the input end of the rectifier circuit. The output end of the rectifier circuit is connected with the power factor correction circuit. The output end of the power factor correction circuit is connected with the LLC resonant circuit. The input ends of the at least two DC-DC output circuits are connected in parallel and then connected with the output end of the LLC resonant circuit. The dimming control circuit is connected with the at least two DC-DC output circuits respectively. According to the actual LED lamp load used, a corresponding number of DC-DC output circuits are set. Each DC-DC output circuit is connected with an LED load to form multi-output. By using the dimming control circuit, each DC-DC output circuit can be controlled individually to realize the individual control of the light emitting brightness of each LED load. The power factor correction circuit is a Boost pfc circuit, which is referred to as a PFC circuit.

[0028] The dimming control circuit can automatically adjust the output current or voltage of each channel according to an external signal (such as a PWM signal) or a preset program, thereby realizing flexible dimming control. After the input circuit receives alternating current and performs filtering and rectification processing, the processed alternating current is sent to the LLC resonant circuit through the PFC circuit for DC-DC conversion. Finally, the multi-output DC-DC dimming output circuit is used to supply power to multiple LED loads and realize dimming control.

[0029] The power factor correction circuit includes a PFC controller, a triode Q1, a MOS tube Q2, and a MOS tube Q3. The base of the triode Q1 is connected with the PFC controller. The emitter of the triode Q1 is connected with the gate of the MOS tube Q2 and the gate of the MOS tube Q3 respectively. The collector of the triode Q1, the source of the MOS tube Q2, and the source of the MOS tube Q3 are connected and grounded. The drain of the MOS tube Q2 and the drain of the MOS tube Q3 are connected and connected with a diode D1. The diode D1 is connected with the PFC controller through a fuse switch FB1.

[0030] More specific connection is: the two ends of the diode D1 are connected in parallel with the diode D2 and the resistor R1 and the capacitor C1, the resistor R1 and the capacitor C1 are connected in series, the base of the triode Q1 is connected with the PFC controller through the resistor R2, the emitter of the triode Q1 is connected with the resistor R3 and the resistor R4, the resistor R3 and the resistor R4 are connected in parallel, the resistor R3 is connected with the gate of the MOS tube Q2, the resistor R4 is connected with the gate of the MOS tube Q3, the diode D3 is connected in series between the resistor R2 and the resistor R3, the drain of the MOS tube Q2 and the drain of the MOS tube Q3 are connected and then connected with the rectifier circuit through the transformer T1, the capacitor group is connected between the diode D1 and the collector of the triode Q1, and the capacitor group can be composed of multiple parallel connected capacitors. The resistor R5 is connected between the collector of the triode Q1 and the resistor R3, the resistor R6 is connected between the source and the drain of the MOS tube Q2, and the capacitor C2 is connected between the source and the drain of the MOS tube Q3. In addition, the resistor R20 and the resistor R21 can be connected before the collector of the triode Q1 is grounded, and the resistor R20 and the resistor R21 are connected in parallel.

[0031] For the rectifier circuit, a known structure is adopted, which is composed of four diode circulation connections, the filter circuit can include the capacitor C3, the resistor R7, the resistor R8, the resistor R9 and the pressure sensitive resistor R10, the resistor R7, the resistor R8 and the resistor R9 are connected in series and then connected in parallel with the capacitor C3, and then connected in parallel with the pressure sensitive resistor R10, the filter circuit is connected with the rectifier circuit through the transformer T2, and the filter circuit is connected with the external input alternating current through the transformer T3. Through the filter circuit and the filtering process, and then through the rectification process of the rectifier circuit, the output current is stabilized, and then enters the PFC circuit.

[0032] The triode Q1, the MOS tube Q2 and the MOS tube Q3 are mainly matched to be turned on or turned off to realize the purpose of improving the PF value output, that is, to improve the power factor, and the capacitor group is used for filtering and anti-interference processing again during output.

[0033] Example two

[0034] Reference Figures 1-3The multi-output LED driving power supply shown includes a filter circuit, a rectifier circuit, a power factor correction circuit, an LLC resonant circuit, at least two DC-DC output circuits, and a dimming control circuit. The input end of the filter circuit is connected with an external power supply, the output end of the filter circuit is connected with the input end of the rectifier circuit, the output end of the rectifier circuit is connected with the power factor correction circuit, the output end of the power factor correction circuit is connected with the LLC resonant circuit, the input ends of the at least two DC-DC output circuits are connected in parallel and then connected with the output end of the LLC resonant circuit, and the dimming control circuit is connected with the at least two DC-DC output circuits respectively. The LLC resonant circuit includes an LLC controller, a MOS tube Q4, and a MOS tube Q5. The gate of the MOS tube Q4 and the gate of the MOS tube Q5 are connected with the LLC controller respectively, the drain of the MOS tube Q4 is connected with the source of the MOS tube Q5, the source of the MOS tube Q4 is connected with the source of the MOS tube Q5 through a capacitor C9, a primary of a transformer T4, and a resistor R23, the secondary of the transformer T4 outputs externally, the gate and the source of the MOS tube Q4 are connected with a resistor R12, the source and the drain of the MOS tube Q4 are connected with a capacitor C10, the gate and the source of the MOS tube Q5 are connected with a resistor R13, and the source and the drain of the MOS tube Q5 are connected with a capacitor C11. The transformer T3 has two secondaries, one of which is connected with a first group of diodes, and the other of which is connected with a second group of diodes. The first group of diodes includes diodes D6 and D7 connected in parallel, and the second group of diodes includes diodes D8 and D9 connected in parallel. The capacitor C12 and the capacitor C13 are connected in parallel between the two secondaries of the transformer T3, the first group of diodes and the second group of diodes are connected and connected with the LLC controller. The on and off control of the MOS tube Q4 and the MOS tube Q5 divides the output end into two paths, further enhances the signal, and filters interference.

[0035] Example Three

[0036] Reference Figures 1-5As shown, the DC-DC output circuit includes a direct current conversion chip, the input side of the direct current conversion chip is connected with a photosensitive triode Q6, and the output side is connected with a MOS tube Q7, the emitter of the photosensitive triode Q6 is connected with an electric resistance R14, the electric resistance R14 is connected in series with an electric resistance R15, the gate of the MOS tube Q7 is connected with the direct current conversion chip through an electric resistance R16, the source of the MOS tube Q7 is grounded and connected with the direct current conversion chip, the drain of the MOS tube Q7 is connected with the output negative pole through an inductor L1, the output positive pole is connected with the direct current conversion chip, and the drain of the MOS tube Q7 is connected to the output positive pole through a diode D10 and an electric resistance R17. In addition, the direct current conversion chip is further connected with an electric resistance R27 and an electric resistance R28, the electric resistance R27 and the electric resistance R28 are connected in parallel and then connected with an electric resistance R26, the electric resistance R26 is connected to the direct current conversion chip, the electric resistance R27 is connected with a capacitor C15 at both ends, and in the output end, the capacitor C16 and an electric resistance R29 are connected in parallel between the positive pole and the negative pole for further filtering, and the capacitor C17 is connected in series with the capacitor C17 and then grounded. The direct current conversion chip inputs an external PWM signal to control the photosensitive triode, thereby realizing the control of the signal and the control of the LED load, and the duty ratio or the frequency of the direct current converter can be controlled to realize the brightness adjustment of the LED load.

[0037] The dimming control circuit includes a dimming chip, and the dimming chip is connected with a light guide module.

[0038] The light guide module includes a triode Q8 and a light emitting diode D20, the base of the triode Q8 is connected with the dimming chip through an electric resistance R18, the emitter of the triode Q8 is grounded and connected with the base of the triode Q8 through an electric resistance R19, and the light emitting diode D20 is connected to the collector of the triode Q8. The light guide module is provided with a plurality of light guide modules, and the plurality of light guide modules are connected in parallel and connected with the dimming chip respectively. The light emitting diode D20 can be connected with an electric resistance R30 and then connected with an input power supply. The light emitting diode D20 emits light with different brightness according to the current control, and the light is emitted to the photosensitive triode Q6, the photosensitive triode Q6 is converted into an electric signal according to the received light signal, and the brightness of the LED load is adjusted.

[0039] The alternating current is first filtered and rectified by the filtering circuit and the rectifying circuit, becomes pulsating direct current and is input to the PFC circuit, the voltage is improved after passing through the PFC circuit and is input to the LLC resonant circuit, and the output of the LLC resonant circuit is transmitted to each DC-DC output circuit, and the preset output is realized through the adjustment control circuit.

[0040] It should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application is described in detail with reference to the embodiments, those skilled in the art can modify the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features, but any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-output LED driving power supply, characterized in that, The application relates to a power supply device, which comprises a filter circuit, a rectifier circuit, a power factor correction circuit, an LLC resonant circuit, at least two DC-DC output circuits and a dimming control circuit.

2. The multi-output LED power supply of claim 1, wherein, The power factor correction circuit comprises a PFC controller, a triode Q1, a MOS tube Q2 and a MOS tube Q3, the base of the triode Q1 is connected with the PFC controller, the emitter of the triode Q1 is connected with the gate of the MOS tube Q2 and the gate of the MOS tube Q3 respectively, the collector of the triode Q1, the source of the MOS tube Q2 and the source of the MOS tube Q3 are connected and grounded, the drain of the MOS tube Q2 and the drain of the MOS tube Q3 are connected and connected with a diode D1, the diode D1 is connected with the PFC controller through a fuse FB1.

3. The multi-output LED power supply of claim 2, wherein, The diode D1 is connected with a diode D2, a resistor R1 and a capacitor C1 in parallel, the resistor R1 and the capacitor C1 are connected in series, the base of the triode Q1 is connected with the PFC controller through a resistor R2, the emitter of the triode Q1 is connected with a resistor R3 and a resistor R4, the resistor R3 is connected with the gate of the MOS tube Q2, the resistor R4 is connected with the gate of the MOS tube Q3, a diode D3 is connected in series between the resistor R2 and the resistor R3, the drain of the MOS tube Q2 and the drain of the MOS tube Q3 are connected and connected with a rectifier circuit through a transformer T1, a capacitor group is connected between the diode D1 and the collector of the triode Q1.

4. The multi-output LED power supply of claim 3, wherein, The collector of the triode Q1 is connected with a resistor R5 between the resistor R3, the source of the MOS tube Q2 is connected with a resistor R6 between the drain of the MOS tube Q2, and the source of the MOS tube Q3 is connected with a capacitor C2 between the drain of the MOS tube Q3.

5. The multi-output LED power supply of claim 4, wherein, The LLC resonant circuit comprises an LLC controller, a MOS tube Q4 and a MOS tube Q5, the gate of the MOS tube Q4 and the gate of the MOS tube Q5 are connected with the LLC controller respectively, the drain of the MOS tube Q4 is connected with the source of the MOS tube Q5, the source of the MOS tube Q4 is connected with the source of the MOS tube Q5 through a capacitor C9 and a primary of a transformer T4, a secondary of the transformer T4 outputs externally, a resistor R12 is connected between the gate and the source of the MOS tube Q4, a capacitor C10 is connected between the source and the drain of the MOS tube Q4, a resistor R13 is connected between the gate and the source of the MOS tube Q5, and a capacitor C11 is connected between the source and the drain of the MOS tube Q5.

6. The multiple output LED power supply of claim 5, wherein, The LLC resonant circuit, the transformer T3 has two secondary, one of which is connected with the first group of diodes, the other secondary is connected with the second group of diodes, the first group of diodes includes parallelly connected diode D6 and diode D7, the second group of diodes includes parallelly connected diode D8 and diode D9, the two secondary of transformer T3 are connected in parallel with capacitor C12 and capacitor C13, the first group of diodes and the second group of diodes are connected and connected with LLC controller.

7. The multiple output LED power supply of claim 1, wherein, The DC-DC output circuit includes a direct current conversion chip, the input side of the direct current conversion chip is connected with a photosensitive triode Q6, and the output side is connected with a MOS tube Q7; the emitter of the photosensitive triode Q6 is connected with a resistor R14, and the resistor R14 is connected in series with a resistor R15; the gate of the MOS tube Q7 is connected with the direct current conversion chip through a resistor R16; the source of the MOS tube Q7 is grounded and connected with the direct current conversion chip; the drain of the MOS tube Q7 is connected with the output negative terminal through an inductor L1; the output positive terminal is connected with the direct current conversion chip, and the drain of the MOS tube Q7 is connected to the output positive terminal through a diode D10 and a resistor R17.

8. The multiple output LED power supply of claim 7, wherein, The dimming control circuit includes a dimming chip, and the dimming chip is connected with a light guide module.

9. The multiple output LED power supply of claim 8, wherein, The light guide module includes a triode Q8 and a light emitting diode, the base of the triode Q8 is connected with the dimming chip through a resistor R18, the emitter of the triode Q8 is grounded and connected with the base of the triode Q8 through a resistor R19, and the light emitting diode is connected to the collector of the triode Q8.

10. The multiple output LED power supply of claim 9, wherein, The light guide module is provided with a plurality of light guide modules, and the plurality of light guide modules are connected in parallel and connected with the dimming chip respectively.

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