Power supply circuit for LED gradual change control

Abstract

The utility model is suitable for the technical field of light control, and provides a power supply circuit for LED gradual change control, which comprises a load P3, a rectifier bridge P1, a sampling control chip P2, an on-off controller P4, a triode Q1, a triode Q2, a triode Q3, a triode Q4, a diode D1, a diode D2, a diode D3, a diode D4, an inductor L1, a capacitor C1, a capacitor C2, a switch S1, a switch S2 and a transformer T1. Wherein the sampling control chip P2 and the on-off controller P4 both comprise multiple paths of control output ends. According to the invention, one path of additional input is introduced from the power grid bus, signal acquisition is carried out by using the load connection end based on the sampling control chip, and electric energy output is compensated based on the acquired signal, so that voltage output can be compensated, and the load capacity of the output end can be improved; when the LED output power of the load end changes significantly and obviously, the device can compensate and adjust the load in time, so that the voltage of the load is more stable.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of light control technology, especially relate to a power supply circuit for LED gradual change control. BACKGROUND

[0002] LED is the abbreviation of Light Emitting Diode. It is a kind of solid-state electronic device, can convert electric energy into light energy. LED emits light through the recombination of electrons and holes in semiconductor material. Compared with traditional light sources, such as incandescent lamps and fluorescent lamps, LED has higher energy efficiency, longer life and faster switching speed.

[0003] In many use scenarios, a very large number of high-power LEDs are needed. For example, as a plant growth lamp, used for agricultural lighting such as light supplementing in greenhouse and plant factory. Also, for industrial lighting in large area of places such as shopping malls, supermarkets, warehouses and factories.

[0004] The existing brightness control of LED generally has voltage regulation control scheme, PWM control scheme, etc., but the output power of the current dimming scheme is relatively small, that is, it can only output constant power or variable power to small LED lighting devices, and it is difficult to apply to large power LED gradual dimming control, so it is necessary to improve the existing LED driving circuit. INNOVATION CONTENT

[0005] The purpose of the embodiment of the present application is to provide a power supply circuit for LED gradual change control, aiming at solving the problem that the output power of the current LED dimming scheme is relatively small, that is, it can only output constant power or variable power to small LED lighting devices, and it is difficult to gradually dim the large power LED.

[0006] The embodiment of the present application is realized in this way, a power supply circuit for LED gradual change control is provided, comprising:

[0007] Load P3, rectifier bridge P1, sampling control chip P2, on-off controller P4, triode Q1, triode Q2, triode Q3, triode Q4, diode D1, diode D2, diode D3, diode D4, inductor L1, capacitor C1, capacitor C2, switch S1, switch S2, transformer T1, switch S4;

[0008] The input end of the rectifier bridge P1 is connected with an AC power grid, the first output end and the second output end of the rectifier bridge P1 are connected with the first end and the second end of a capacitor C1 respectively, the first end of the capacitor C1, the collector of a triode Q1, the negative electrode of a diode D1, the collector of a triode Q2 and the negative electrode of a diode D2 are connected with each other, the second end of the capacitor C1, the collector of a triode Q3, the negative electrode of a diode D3, the collector of a triode Q4 and the negative electrode of a diode D4 are connected with each other, the positive electrode of the diode D1, the negative electrode of the diode D3, the emitter of the triode Q1 and the collector of the triode Q3 are connected with each other, the emitter of the triode Q1 is also connected with the first end of an inductor L1, the second end of the inductor L1 is connected with the first end of the capacitor C1, the second end of the capacitor C1 is connected with the first end of a switch S1 and the first end of a switch S2 respectively, the emitter of the triode Q2 is also connected with the first end of a load P3, the two ends of a switch S4 are connected with the first end of a primary side of a transformer T1 and the second end of the primary side of the transformer T1 respectively;

[0009] The first sampling end of a sampling control chip P2 is connected with the first end of the primary side of the transformer T1, the second end of the primary side of the transformer T1 is connected with the second end of the load P3, the first end of the secondary side of the transformer T1 is connected with the first end of the switch S3, the second end of the switch S3 is connected with the first bus of the AC power grid, the first end of the primary side of the transformer T1 is also connected with the second bus of the AC power grid, the second end of the secondary side of the transformer T1 is connected with the second end of the switch S2, the midpoint of the secondary side of the transformer T1 is connected with the second end of the switch S1, the first end of the secondary side of the transformer T1 is also connected with the first end of the load P3, the second sampling end of the sampling control chip P2 is connected with the second end of the load P3, the sampling control chip P2 contains four control signal output ends, the four control signal output ends are connected with the bases of the triode Q1, the triode Q2, the triode Q3 and the triode Q4 respectively, the sampling control chip P2 also contains two switch signal output ends, the two switch signal output ends are connected with a on-off controller P4, the on-off controller P4 has three control signal output ends, the three control signal output ends are used for controlling the on-off states of the switch S1, the switch S2 and the switch S3 respectively.

[0010] Preferably, the load P3 contains a lamp group rectification inverter, and the sampling control chip P2 is also used for adjusting the output voltage of the lamp group rectification inverter.

[0011] Preferably, the load P3 contains a plurality of light emitting diodes, and the light emitting diodes are connected with each other in parallel.

[0012] Preferably, the on-off states of the switch S1 and the switch S2 are repulsive.

[0013] Preferably, one of the two-way switch signal outputs of the sampling control chip P2 is used to control the on-off state switching of the switches S1 and S2, and the other is used to control the on-off state of the switch S3.

[0014] Preferably, the sampling control chip P2 is also used to control the on-off state of the switch S4.

[0015] The power supply circuit for LED gradual change control provided by the embodiment of the application has the advantages that: an additional input is introduced from a power grid bus, a sampling control chip is used to collect signals through a load connection end, and the power output is compensated based on the collected signals, so that the power output can be compensated, the reference voltage of a subsequent voltage regulating circuit is kept stable, the load carrying capacity of an output end is improved, when the LED output power of the load end changes significantly, the device can automatically compensate and adjust in time based on the load condition, the reference voltage output is more stable, and the gradual change control of the LED is more accurate. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The circuit composition diagram of the power supply circuit for LED gradual change control provided by the embodiment of the application. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further described in detail by combining with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0018] As for the "coupling" or "connection" used in this paper, it can refer to the direct physical or electrical contact or indirect physical or electrical contact between two or more elements, or the mutual operation or action of two or more elements. The term "circuit" generally refers to an object connected by one or more transistors and / or one or more active and passive elements in a certain way to process signals.

[0019] However, those skilled in the art should understand that the same elements may be called by different names. The application does not distinguish elements by name, but by functional difference.

[0020] Furthermore, this application's embodiments cover features of multiple specific embodiments, as well as method steps and their order for constructing and operating these specific embodiments. However, other specific embodiments may also be used to achieve the same or equivalent functions and step sequences. Unless otherwise defined in this specification, the scientific and technical terms used herein have the same meaning as understood and commonly used by those skilled in the art to which this application pertains. Moreover, unless conflicting with the context, singular nouns used herein encompass their plural forms, and vice versa.

[0021] The specific implementation of this application will be described in detail below with reference to specific embodiments.

[0022] like Figure 1 As shown, a power supply circuit for LED gradient control provided in an embodiment of this application includes:

[0023] Load P3, rectifier bridge P1, sampling control chip P2, on / off controller P4, transistor Q1, transistor Q2, transistor Q3, transistor Q4, diode D1, diode D2, diode D3, diode D4, inductor L1, capacitor C1, capacitor C2, switch S1, switch S2, transformer T1, switch S4;

[0024] The input terminal of the rectifier bridge P1 is connected to the AC power grid. The first and second output terminals of the rectifier bridge P1 are connected to the first and second terminals of capacitor C1, respectively. The first terminal of capacitor C1, the collector of transistor Q1, the cathode of diode D1, the collector of transistor Q2, and the cathode of diode D2 are interconnected. The second terminal of capacitor C1, the collector of transistor Q3, the cathode of diode D3, the collector of transistor Q4, and the cathode of diode D4 are interconnected. The anode of diode D1, the cathode of diode D3, the emitter of transistor Q1, and the collector of transistor Q3 are interconnected. The emitter of transistor Q1 is also connected to the first terminal of inductor L1. The second terminal of inductor L1 is connected to the first terminal of capacitor C1. The second terminal of capacitor C1 is interconnected with the first terminals of both switch S1 and switch S2. The emitter of transistor Q2 is also connected to the first terminal of load P3. The two terminals of switch S4 are connected to the first and second terminals of the primary side of transformer T1, respectively.

[0025] The first sampling end of the sampling control chip P2 is connected with the first end of the primary side of the transformer T1, the second end of the primary side of the transformer T1 is connected with the second end of the load P3, the first end of the secondary side of the transformer T1 is connected with the first end of the switch S3, the second end of the switch S3 is connected with the first bus of the AC power grid, the first end of the primary side of the transformer T1 is also connected with the second bus of the AC power grid, the second end of the secondary side of the transformer T1 is connected with the second end of the switch S2, the midpoint of the secondary side of the transformer is connected with the second end of the switch S1, the first end of the secondary side of the transformer is also connected with the first end of the load P3, the second sampling end of the sampling control chip P2 is connected with the second end of the load P3, the control chip P2 contains four control signal output ends, which are respectively connected with the bases of the triode Q1, the triode Q2, the triode Q3 and the triode Q4, the sampling control chip P2 also contains two switch signal output ends, which are connected with the on-off controller P4, the on-off controller P4 has three control signal output ends, which are respectively used for controlling the on-off states of the switches S1, S2 and S3.

[0026] In an example of the present application, the switches S1, S2, S3 and S4 can all be relays, the triodes Q1, Q2, Q3 and Q4 can all be NPN type high-power power triodes, the gates of each of them are connected with the sampling control chip P2, the whole device can be powered by the AC power grid, the two samplings of the sampling control chip P2 connected with the power transmission line can all be provided with samplers to sample in the form of voltage, current or power, only the connection relationship is shown in the figure, and the specific sampling mode is not shown. The on-off controller P4 is used for controlling the switches S1, S2 and S3 based on a preset scheme and the control signals output by the sampling control chip P2.

[0027] Those skilled in the art can know that, Figure 1 The circuit shown can contain more units or elements. For example, a rectifying unit can also be arranged in the load P3 for converting AC into DC, and a DC voltage regulating unit or an AC voltage regulating unit or a PWM voltage regulating unit can also be contained for performing dimming and gradual light control. The sampling control chip P2 in the present application can control the amplitude of dimming and voltage regulation, which is not limited here, and the structure of the electric energy stabilizing and compensating unit disclosed in the present application can be used to stabilize the reference voltage of the voltage regulating unit. So that the dimming and gradual light control is more accurate, the reference voltage offset or insufficient output power is avoided, and the phenomenon of weak load carrying capacity is overcome. Figure 1

[0028] ​The advantages are: by introducing an additional input from the busbar, and based on the sampling control chip using the load connection end for signal acquisition, based on the collected signals to compensate the power output, and then not only can compensate the voltage output, but also can improve the load capacity of the output end, when the load end LED output power changes significantly, the device can compensate the load in time, so that the voltage is more stable.

[0029] In the embodiment of the application, the sampling control chip P2 rectifies the electric energy through diode D1, diode D2, diode D3 and diode D4, and inversely adjusts the voltage through four triodes, and controls one of S1 or S2 to remain connected and controls S4 to be disconnected, at this time the busbar electric energy is transmitted through the transformer T1, and the inversely adjusted electric energy compensates the transformer T1 to stabilize the output voltage and improve the load capacity.

[0030] In one embodiment, as shown in Figure 1 The controller P2 can control P4 to switch the switching states of S1 and S2 to change the compensation power level.

[0031] As a preferred embodiment of the application, the load P3 contains a lamp group rectifier inverter, and the sampling control chip P2 is further used to adjust the output voltage of the lamp group rectifier inverter.

[0032] In the embodiment of the application, the load P3 can be provided with an AC-DC rectifier transformer device, which can be cooperatively controlled in voltage by the sampling control chip P2.

[0033] As another preferred embodiment of the application, the load P3 contains a plurality of light emitting diodes, and the light emitting diodes are connected to each other in parallel.

[0034] In the embodiment of the application, a large number of light emitting diodes are provided at the load end, and the diodes can be adjusted in voltage by the lamp group rectifier inverter.

[0035] As another preferred embodiment of the application, the on-off states of the switch S1 and the switch S2 are repulsive.

[0036] In the embodiment of the application, the switch is used to switch the compensation level. Only one of the switch S1 and the switch S2 can be in the on state.

[0037] As another preferred embodiment of the application, one of the two-way switch signals of the sampling control chip P2 is used to control the on-off state switching of the switch S1 and the switch S2, and the other switch signal is used to control the on-off state of the switch S3.

[0038] In the embodiment of the present application, the sampling control chip P2 can also be provided with a multi-path switch control output end, and can control the state of each switch in the circuit in real time by direct control or indirect control.

[0039] As another preferred embodiment of the present application, the sampling control chip P2 is also used to control the on-off state of the switch S4.

[0040] In the embodiment of the present application, the control mode of the sampling control chip P2 can be manually programmed and adjusted, and the on-off state of the switch S4 can be automatically controlled, so as to improve the integration level and reduce the production cost.

[0041] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A power supply circuit for LED fade control, characterized by, Comprise: Load P3, rectifier bridge P1, sampling control chip P2, on-off controller P4, triode Q1, triode Q2, triode Q3, triode Q4, diode D1, diode D2, diode D3, diode D4, inductor L1, capacitor C1, capacitor C2, switch S1, switch S2, transformer T1, switch S4; The input end of the rectifier bridge P1 is connected with the AC power grid, the first output end and the second output end of the rectifier bridge P1 are connected with the first end and the second end of the capacitor C1 respectively, the first end of the capacitor C1, the collector of the triode Q1, the negative electrode of the diode D1, the collector of the triode Q2 and the negative electrode of the diode D2 are connected with each other, the second end of the capacitor C1, the collector of the triode Q3, the negative electrode of the diode D3, the collector of the triode Q4 and the negative electrode of the diode D4 are connected with each other, the positive electrode of the diode D1, the negative electrode of the diode D3, the emitter of the triode Q1 and the collector of the triode Q3 are connected with each other, the emitter of the triode Q1 is also connected with the first end of the inductor L1, the second end of the inductor L1 is connected with the first end of the capacitor C1, the second end of the capacitor C1 is connected with the first end of the switch S1 and the first end of the switch S2, the emitter of the triode Q2 is also connected with the first end of the load P3, the two ends of the switch S4 are connected with the first end of the primary side of the transformer T1 and the second end of the primary side of the transformer T1 respectively; The first sampling end of the sampling control chip P2 is connected with the first end of the primary side of the transformer T1, the second end of the primary side of the transformer T1 is connected with the second end of the load P3, the first end of the secondary side of the transformer T1 is connected with the first end of the switch S3, the second end of the switch S3 is connected with the first bus of the AC power grid, the first end of the primary side of the transformer T1 is also connected with the second bus of the AC power grid, the second end of the secondary side of the transformer T1 is connected with the second end of the switch S2, the midpoint of the secondary side of the transformer T1 is connected with the second end of the switch S1, the first end of the secondary side of the transformer T1 is also connected with the first end of the load P3, the second sampling end of the sampling control chip P2 is connected with the second end of the load P3, the control chip P2 contains four control signal output ends, the four control signal output ends are connected with the bases of the triode Q1, the triode Q2, the triode Q3 and the triode Q4 respectively, the sampling control chip P2 also contains two switch signal output ends, the two switch signal output ends are connected with the on-off controller P4, the on-off controller P4 has three control signal output ends, the three control signal output ends are used for controlling the on-off states of the switch S1, the switch S2 and the switch S3 respectively.

2. The power supply circuit for LED fade control according to claim 1, wherein, The load P3 contains a lamp group rectification inverter, and the sampling control chip P2 is also used for adjusting the output voltage of the lamp group rectification inverter.

3. The power supply circuit for LED fade control according to claim 2, wherein, The load P3 contains a plurality of light emitting diodes, and the light emitting diodes are connected with each other in parallel.

4. The power supply circuit for LED fade control of claim 1, wherein, The on-off states of the switch S1 and the switch S2 are repulsive.

5. The power supply circuit for LED fade control of claim 4, wherein, One of the two switch signal output ends of the sampling control chip P2 is used for controlling the on-off state switching of the switch S1 and the switch S2, and the other is used for controlling the on-off state of the switch S3.

6. The power supply circuit for LED fade control of claim 1, wherein, The sampling control chip P2 is also configured to control the on-off state of the switch S4.

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