Dual-constant-voltage output communication-free wireless LED driver based on reconfigurable rectifier

Abstract

The invention relates to the technical field of LED wireless driving, and particularly discloses a dual-constant-voltage output communication-free wireless LED driver based on a reconfigurable rectifier, which comprises a direct-current voltage source UD, a high-frequency inverter H, a transmitting side compensation network, a receiving side compensation network, a special rectifier, a filter capacitor CF and an LED equivalent resistor RB. The LED driver has the beneficial effects that 1, the LED driver can realize switching of two constant voltage topologies by controlling the working states of two MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) switch tubes in the special rectifier, so that the driver can provide different power supply outputs for the LED lamp string according to actual environment requirements, and the LED lamp string works in different modes; and 2, the LED driver disclosed by the invention can realize zero phase angle operation in two constant voltage working modes, so that relatively high transmission efficiency is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of LED wireless driving, and in particular to a dual constant voltage output non-communication wireless LED driver based on a reconfigurable rectifier. Background Art

[0002] With the rapid development of LED (light-emitting diode) technology, LED has gradually become the mainstream choice in the field of lighting. Compared with traditional lighting methods, LED has significant advantages such as high efficiency, long life, energy saving and environmental protection, and is widely used in many fields such as home, business, and public facilities. However, the traditional LED driving method usually relies on constant current source power supply. Although this method can effectively control the brightness of the LED and ensure its stability, it has many limitations in practical applications. First, the driver powered by the constant current source is more complex and usually requires multiple circuit components for adjustment and control, which increases the difficulty of design and maintenance. Secondly, this power supply method has poor adaptability to the power supply, especially in an environment with large input voltage fluctuations or frequent load changes, which can easily cause the LED brightness to be unstable and affect the user experience. In addition, the constant current source power supply usually requires additional heat dissipation measures to avoid damage to the LED due to excessive current, thereby increasing the overall cost of the driver. Summary of the invention

[0003] The present invention proposes a non-communication wireless LED driver with dual constant voltage output based on a reconfigurable rectifier to solve the above problems. The driver can perform topology transformation by controlling the working state of a special rectifier according to the changes in actual ambient light, thereby providing different voltage outputs for the LED so that the LED can work in energy-saving mode or lighting mode respectively.

[0004] The technical solution of the present invention is achieved in this way:

[0005] A dual constant voltage output non-communication wireless LED driver based on a reconfigurable rectifier, comprising a DC voltage source U D , high frequency inverter H, transmitting side compensation network, receiving side compensation network, special rectifier, filter capacitor C F And LED equivalent resistance R B ;

[0006] The high frequency inverter H is composed of four MOSFET switch tubes (Q1, Q2, Q3, Q4);

[0007] The transmitter side compensation network consists of a first compensation capacitor C connected in series P and the first coil L P composition;

[0008] The receiving side compensation network consists of the second coil L S Connect the second compensation capacitor C in seriesS , the third compensation capacitor C T and the third coil L T composition;

[0009] The special rectifier is composed of a diode D1 and two MOSFET switch tubes (Q5, Q6);

[0010] The DC voltage source U D The positive and negative electrodes are connected to the two input ports of the high-frequency inverter H respectively, and one output port of the high-frequency inverter H is connected in series with the first compensation capacitor C P , the first compensation capacitor C P The other end is connected to the first coil L P One end of the first coil L P The other end is connected to another output port of the high frequency inverter H;

[0011] The second coil L S One end of the second compensation capacitor C is connected in series S One end of the second compensation capacitor C S The other end is connected in parallel with the second coil L T And MOSFET switch tube Q5, MOSFET switch tube Q6, the third coil L T The other end is connected in series with the third compensation capacitor C T , the third compensation capacitor C T The other end of the MOSFET switch tube Q6 is connected to the second coil L S The other end of the special rectifier is connected to the filter capacitor C F is the LED equivalent resistance R B powered by.

[0012] Furthermore, the parameter designs of the transmitter-side compensation network and the receiver-side compensation network are as follows:

[0013]

[0014] Where ω is the driver resonant angular frequency.

[0015] Furthermore, the control unit of the LED driver is a special rectifier, which can reconstruct the LED driver topology into two different SSS three-coil structures by controlling the on and off of the MOSFET switch tube Q5 and the MOSFET switch tube Q6. The two three-coil structures have different constant voltage output voltages, which can meet the energy-saving mode and lighting mode driving use of the LED light string.

[0016] Furthermore, when the MOSFET switch tube Q5 is turned off and the MOSFET switch tube Q6 is turned on, it is an energy-saving mode, and when the MOSFET switch tube Q5 is turned on and the MOSFET switch tube Q6 is turned off, it is a lighting mode.

[0017] By adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0018] 1. By controlling the working state of the two MOSFET switch tubes in the special rectifier, the LED driver can realize the switching of two constant voltage topologies, so that the driver can provide different power supply outputs for the LED light string according to the actual environment requirements, so that the LED light string can work in different modes;

[0019] 2. The LED driver of the present invention can achieve zero phase angle operation in two constant voltage working modes, thereby ensuring higher transmission efficiency;

[0020] 3. The control unit of the LED driver of the present invention for executing the mode switching function is located on the receiver, so that the LED driver system does not need communication and is suitable for underwater LED driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 is the overall structure diagram of the LED driver of the present invention;

[0023] Figure 2 is a structural diagram of the LED driver of the present invention working in energy-saving mode;

[0024] Figure 3 is a simplified circuit diagram of the LED driver of the present invention working in energy-saving mode;

[0025] Figure 4 is a structural diagram of the LED driver of the present invention working in the lighting mode;

[0026] Figure 5 is a simplified circuit diagram of the LED driver of the present invention working in the lighting mode. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] like Figure 1 As shown, a dual constant voltage output non-communication wireless LED driver based on a reconfigurable rectifier includes a DC voltage source U D , high frequency inverter H, transmitting side compensation network, receiving side compensation network, special rectifier, filter capacitor C F And LED equivalent resistance R B ;

[0029] The high frequency inverter H is composed of four MOSFET switch tubes (Q1, Q2, Q3, Q4);

[0030] The transmitter side compensation network consists of a first compensation capacitor C connected in series P and the first coil L P composition;

[0031] The receiving side compensation network consists of the second coil L S Connect the second compensation capacitor C in series S , the third compensation capacitor C T and the third coil L T composition;

[0032] The special rectifier is composed of a diode D1 and two MOSFET switch tubes (Q5, Q6);

[0033] The DC voltage source U D The positive and negative electrodes are connected to the two input ports of the high-frequency inverter H respectively, and one output port of the high-frequency inverter H is connected in series with the first compensation capacitor C P , the first compensation capacitor C P The other end is connected to the first coil L P One end of the first coil L P The other end is connected to another output port of the high frequency inverter H;

[0034] The second coil L S One end of the second compensation capacitor C is connected in series S One end of the second compensation capacitor C S The other end is connected in parallel with the second coil L T And MOSFET switch tube Q5, MOSFET switch tube Q6, the third coil L TThe other end is connected in series with the third compensation capacitor C T , the third compensation capacitor C T The other end of the MOSFET switch tube Q6 is connected to the second coil L S The other end of the special rectifier is connected to the filter capacitor C F is the LED equivalent resistance R B powered by.

[0035] In this embodiment, the parameters of the transmitter-side compensation network and the receiver-side compensation network are designed as follows:

[0036]

[0037] Where ω is the driver resonant angular frequency.

[0038] Working principle: The LED driver of the present invention determines the working mode to be executed according to the actual ambient light demand, that is, when the ambient light is sufficient, the LED driver controls the MOSFET switch tube Q5 located in the special rectifier to be turned off, and the MOSFET switch tube Q6 to be turned on, so that the anti-parallel diode located in the MOSFET switch tube Q5 and the diode D1 form a rectifier, and the LED driver works in the energy-saving mode; when the ambient light is insufficient, the LED driver controls the MOSFET switch tube Q5 located in the special rectifier to be turned on, and when the MOSFET switch tube Q6 is turned off, the anti-parallel diode located in the MOSFET switch tube Q6 and the diode D1 form a rectifier, and the LED driver works in the lighting mode.

[0039] The LED driver works in energy-saving mode. At this time, the LED driver structure is as follows: Figure 2 As shown, in the energy-saving mode, the MOSFET switch tube Q5 is turned off, the MOSFET switch tube Q6 is turned on, and the anti-parallel diode in the MOSFET switch tube Q5 and the diode D1 form a rectifier and are suspended on the third coil L T And the third compensation capacitor C T In the resonant circuit composed of the first specification, the LED driver is configured as a three-coil constant voltage structure to drive the LED light string to work in energy-saving mode. T And the third compensation capacitor C T The loop is a receiving resonant circuit, which consists of the second coil L S and the second compensation capacitor C S The circuit formed is a relay resonant circuit. The simplified circuit diagram of the LED driver working in energy-saving mode is as follows: Figure 3 As shown, the inverter AC output voltage U i The root mean square value of the DC voltage source U DThe equivalent relationship is shown in formula (1).

[0040]

[0041] According to Kirchhoff's voltage law (KVL), combined with Figure 3 The simplified circuit can be listed as follows:

[0042]

[0043] Among them, U i Indicates the output AC voltage of the high-frequency inverter H, and I1 indicates the voltage flowing through the first coil L P Current, I2, represents the current flowing through the second coil L S Current, I3, represents the current flowing through the third coil L T Current, j represents the imaginary unit, M ij Represents the mutual inductance between the coils in the transmitter-side compensation network and the receiver-side compensation network;

[0044] According to the literature Analysis and Design of Three-Coil Structure WPT System With Constant Output Current and Voltage for Battery Charging Applications, if the driver wants to achieve two constant voltage characteristics, the following conditions must be met:

[0045]

[0046] By using equations (1), (2) and (3), we can obtain equation (4):

[0047]

[0048] It can be seen from formula (4) that the LED driver of the present application can achieve constant voltage output and zero phase angle (ZPA) operation in energy-saving mode.

[0049] The LED driver works in the lighting mode. At this time, the LED driver structure is as follows: Figure 4 As shown, in the lighting mode, the MOSFET switch tube Q5 is turned on, the MOSFET switch tube Q6 is turned off, and the anti-parallel diode in the MOSFET switch tube Q6 and the diode D1 form a rectifier and are suspended on the second coil L S and the second compensation capacitor C S In the resonant circuit composed of the second specification, the LED driver is configured as a three-coil constant voltage structure to drive the LED light string to work in the lighting mode. S and the second compensation capacitor CS The loop is a receiving resonant circuit, which consists of the third coil L T And the third compensation capacitor C T The formed loop is a relay resonant circuit.

[0050] The simplified circuit diagram of the LED driver working in lighting mode is as follows Figure 5 As shown, based on KVL, equation (5) can be obtained:

[0051]

[0052] Among them, U i Indicates the output AC voltage of the high-frequency inverter H, and I1 indicates the voltage flowing through the first coil L P Current, I3, represents the current flowing through the third coil L T Current, I2, represents the current flowing through the second coil L S Current, j represents the imaginary unit, M ij Represents the mutual inductance between the coils in the transmitter-side compensation network and the receiver-side compensation network;

[0053] Substituting equations (1) and (3) into equation (5) yields equation (6):

[0054]

[0055] It can be seen from formula (6) that the LED driver of the present application can achieve another specification of constant voltage output and zero phase angle (ZPA) operation in the lighting mode.

[0056] Through the above analysis, it can be concluded that the LED driver of the present invention can achieve low voltage driving the LED to work in a small current state in energy-saving mode by reasonably configuring the parameters of the loosely coupled transformer, and achieve high voltage driving the LED to work in a large current state in lighting mode.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A wireless LED driver with dual constant voltage output and no communication based on a reconfigurable rectifier, characterized by: Including DC voltage source U D , high frequency inverter H, transmitting side compensation network, receiving side compensation network, special rectifier, filter capacitor C F And LED equivalent resistance R B ; The high frequency inverter H is composed of four MOSFET switch tubes (Q1, Q2, Q3, Q4); The transmitter side compensation network consists of a first compensation capacitor C connected in series P and the first coil L P composition; The receiving side compensation network consists of the second coil L S Connect the second compensation capacitor C in series S , the third compensation capacitor C T and the third coil L T composition; The special rectifier is composed of a diode D1 and two MOSFET switch tubes (Q5, Q6); The DC voltage source U D The positive and negative electrodes are connected to the two input ports of the high-frequency inverter H respectively, and one output port of the high-frequency inverter H is connected in series with the first compensation capacitor C P , the first compensation capacitor C P The other end is connected to the first coil L P One end of the first coil L P The other end is connected to another output port of the high frequency inverter H; The second coil L S One end of the second compensation capacitor C is connected in series S One end of the second compensation capacitor C S The other end is connected in parallel with the second coil L T And MOSFET switch tube Q5, MOSFET switch tube Q6, the third coil L T The other end is connected in series with the third compensation capacitor C T , the third compensation capacitor C T The other end of the MOSFET switch tube Q6 is connected to the second coil L S The other end of the special rectifier is connected to the filter capacitor C F is the LED equivalent resistance R B powered by.

2. According to claim 1, a dual constant voltage output non-communication wireless LED driver based on a reconfigurable rectifier is characterized in that: The parameter design of the transmitting side compensation network and the receiving side compensation network is as follows: Where ω is the driver resonant angular frequency.

3. According to claim 1, a dual constant voltage output non-communication wireless LED driver based on a reconfigurable rectifier is characterized in that: The control unit of the LED driver is a special rectifier. By controlling the on and off of the MOSFET switch tube Q5 and the MOSFET switch tube Q6, the LED driver topology can be reconstructed into two different SSS three-coil structures. The constant voltage output voltages of the two three-coil structures are different, which meets the energy-saving mode and lighting mode driving use of the LED light string.

4. A dual constant voltage output non-communication wireless LED driver based on a reconfigurable rectifier according to claim 1, characterized in that: When the MOSFET switch tube Q5 is turned off and the MOSFET switch tube Q6 is turned on, it is an energy-saving mode; when the MOSFET switch tube Q5 is turned on and the MOSFET switch tube Q6 is turned off, it is a lighting mode.

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