A LED wireless power supply device based on single-tube inverter

Abstract

The present invention discloses a LED wireless power supply device based on a single-tube inverter, which belongs to the field of electrical technology. The LED wireless power supply device based on a single-tube inverter includes two topological structures. The first topological structure includes an electromagnetic interference suppression circuit, a power factor correction circuit, a primary-side resonant network, a secondary-side resonant network, an industrial frequency rectifier bridge, a high-frequency rectifier bridge and a switch tube Q1. The second topological structure adds a single-ended flyback circuit on the basis of the first one. The two topological structures can respectively realize constant-current wireless power supply for LED lamp groups, and have the advantages of low mechanical loss, simple replacement of LED lamp groups, and high reliability. Only one switch tube is used in the inverter circuit in the present invention, so it is small in size, low in cost, simple to control, has no bridge arm direct-through problem, and has high reliability, filling the gap for LED constant-current wireless power supply with a single-tube inverter.

Description

Technical field:

[0001] The present invention belongs to the field of electrical technology and relates to an LED wireless power supply device based on a single-tube inverter, that is, a single-tube inverter inductively coupled power transmission device that can provide constant current wireless power supply to LED lamp beads. Background technology:

[0002] Currently, most LEDs are powered by wired circuits, and there is no literature on single-transistor LC resonance-based constant-current wireless power supply for LEDs. Single-transistor inverter circuits offer advantages over full-bridge inverter circuits, including fewer switching components, simpler control, and lower switching losses. They also avoid the issue of direct current between the upper and lower bridge arms. Compared to traditional wired LED power supplies, single-transistor wireless power supply circuits are safer, more convenient, and more aesthetically pleasing, eliminating the need for physical plugging and unplugging to replace the LEDs. Constant current is achieved through variable frequency control. Therefore, designing a single-transistor constant-current power supply device and control method suitable for LED power supply, featuring a simple circuit structure, low cost, and high reliability, is of great practical value. Summary of the invention:

[0003] The present invention aims to overcome the shortcomings of the prior art and achieve wireless LED power supply based on a single-transistor inverter circuit. It provides a device and method for wireless LED power supply based on a single-transistor inverter constant current output topology that eliminates the problem of bridge arm direct current.

[0004] The object of the present invention is achieved as follows. The present invention provides a single-tube inverter-based LED wireless power supply device, which includes two topological structures. The first topological structure rectifies 220V industrial frequency AC power and directly powers the single-tube circuit, and is recorded as a high-voltage DC power supply device. The second topological structure rectifies 220V industrial frequency AC power and then uses a flyback circuit to step down the voltage to power the single-tube circuit, and is recorded as a low-voltage DC power supply device.

[0005] The topological structure of the high-voltage power supply device includes an industrial frequency alternating current power supply AC, an electromagnetic interference suppression capacitor C1, a common-mode inductor L1, an industrial frequency rectifier bridge Z1, a correction inductor L2, a correction capacitor C2, a primary-side resonant capacitor C3, a primary-side transmitting inductor Lp, a secondary-side receiving inductor Ls, a secondary-side resonant capacitor C4, a high-frequency rectifier bridge Z2, a high-frequency filter capacitor C5, a switch tube Q1 and an LED lamp group; the industrial frequency alternating current power supply AC is connected in parallel with the electromagnetic interference suppression capacitor C1 and then connected to the common-mode inductor L1, the other end of the common-mode inductor L1 is connected to the input end of the industrial frequency rectifier bridge Z1, the output end of the industrial frequency rectifier bridge Z1 is connected in parallel with the correction capacitor C2, and the correction inductor L2 is connected to the output of the industrial frequency rectifier bridge Z1. Between the positive electrode of the output end and the positive electrode of the correction capacitor C2, the primary resonant capacitor C3 is connected in parallel with the primary transmitting inductor Lp, and its positive electrode is connected to the positive electrode of the correction capacitor C2, and the negative electrode is connected to the source electrode of the switching tube Q1. The drain electrode of the switching tube Q1 is respectively connected to the negative electrode of the correction capacitor C2 and the ground. The primary transmitting inductor Lp and the secondary receiving inductor Ls are coupled to each other through the mutual inductance M. The secondary receiving inductor Ls is connected in parallel with the secondary resonant capacitor C4 and then connected to the input end of the high-frequency rectifier bridge Z2. The output end of the high-frequency rectifier bridge Z2 is connected in parallel with the high-frequency filter capacitor C5. The positive and negative electrodes of the high-frequency filter capacitor C5 are the output ends of the high-voltage DC power supply device, and this output end is connected in parallel with the LED lamp group;

[0006] The circuit formed by connecting the primary resonant capacitor C3 in the high-voltage power supply device and the switch tube Q1 is recorded as the intermediate circuit. One end of the intermediate circuit is the positive electrode of the primary resonant capacitor C3, and the other end is the drain of the switch tube Q1. The topology structure of the low-voltage power supply device is to insert a single-ended flyback circuit between the correction capacitor C2 of the high-voltage power supply device and the intermediate circuit.

[0007] Preferably, the topology of the single-ended flyback circuit includes a flyback circuit switch tube Q2, an absorption diode D1, an absorption resistor R1, an absorption capacitor C5, a transformer T, a single-ended flyback output diode D2, a first single-ended flyback output filter capacitor C6, a second single-ended flyback output filter capacitor C7, and a single-ended flyback filter inductor L3, wherein the drain of the switch tube Q2 is connected to the ground and the negative electrode of the correction capacitor C2 respectively, and the second single-ended flyback output filter capacitor C7 is connected in parallel with the intermediate circuit;

[0008] After the absorption resistor R1 is connected in parallel with the absorption capacitor C5, one end is connected to the positive electrode of the correction capacitor C2, and the other end is connected to the cathode of the absorption diode D1. One end of the primary side of the transformer T is connected to the positive electrode of the absorption capacitor C5, and the other end is connected to the anode of the absorption diode D1 and the source of the switch tube Q2; one end of the secondary side of the transformer T is connected to the anode of the single-ended flyback output diode D2, and the other end is connected to the negative electrode of the first single-ended flyback output filter capacitor C6 and the second single-ended flyback output filter capacitor C7. The cathode of the single-ended flyback output diode D2 is connected to the positive electrode of the first single-ended flyback output filter capacitor C6 and one end of the single-ended flyback output filter inductor L3, and the other end of the single-ended flyback output filter inductor L3 is connected to the positive electrode of the single-ended flyback output filter capacitor C7.

[0009] Preferably, a fuse F is installed between the industrial frequency alternating current power source AC and the electromagnetic interference suppression capacitor C1.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1. The present invention realizes the application of a single-tube inverter circuit to provide constant-current wireless power supply for the LED lamp group, eliminating the mechanical loss caused by plugging and unplugging, and the LED lamp group is easy to replace.

[0012] 2. The present invention realizes that the inverter circuit for wireless power supply to the LED lamp group adopts a switch tube, which is small in size and low in cost. It only controls a single switch tube and is simple to control. There is no bridge arm direct-through problem and the reliability is high.

[0013] 3. The present invention is a technical solution for achieving stable operation of LED wireless constant current power supply based on a single-tube inverter circuit. Under this condition, LED constant current wireless power supply based on a single-tube inverter has not been explored on a large scale. Therefore, the present invention proposes a LED constant current wireless power supply based on a single-tube inverter to fill the gap. Description of the drawings:

[0014] Figure 1 This is a topological diagram of the high-voltage DC power supply device described in the present invention.

[0015] Figure 2 This is a topological diagram of the low-voltage DC power supply device described in the present invention.

[0016] Figure 3 This is a topological diagram of the single-ended flyback circuit described in the present invention.

[0017] Figure 4 Schematic diagram of the connection of the LED lamp group in an embodiment of the present invention. Specific implementation method:

[0018] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 is a topological diagram of the high-voltage DC power supply device of the present invention, Figure 2 is a topological diagram of the low-voltage DC power supply device of the present invention, Figure 3 This is the topology diagram of the single-ended flyback circuit described in the present invention. Figure 1-Figure 3 It can be seen that the present invention provides an LED wireless power supply device based on a single-tube inverter. The LED wireless power supply device based on a single-tube inverter includes two topological structures. The first topological structure rectifies the 220V industrial frequency AC power and directly powers the single-tube circuit, and is recorded as a high-voltage DC power supply device. The second topological structure rectifies the 220V industrial frequency AC power and then applies a flyback circuit to reduce the voltage to power the single-tube circuit, and is recorded as a low-voltage DC power supply device.

[0020] The topological structure of the high-voltage power supply device includes an industrial frequency AC power supply AC, an electromagnetic interference suppression capacitor C1, a common mode inductor L1, an industrial frequency rectifier bridge Z1, a correction inductor L2, a correction capacitor C2, a primary side resonant capacitor C3, a primary side transmitting inductor Lp, a secondary side receiving inductor Ls, a secondary side resonant capacitor C4, a high frequency rectifier bridge Z2, a high frequency filter capacitor C5, a switch tube Q1 and an LED lamp group. The industrial frequency AC power supply AC is connected in parallel with the electromagnetic interference suppression capacitor C1 and then connected to the common mode inductor L1. The other end of the common mode inductor L1 is connected to the input end of the industrial frequency rectifier bridge Z1. The output end of the industrial frequency rectifier bridge Z1 is connected in parallel with the correction capacitor C2. The correction inductor L2 is connected between the positive electrode of the output end of the industrial frequency rectifier bridge Z1 and the positive electrode of the correction capacitor C2. After the primary side resonant capacitor C3 is connected in parallel with the primary side transmitting inductor Lp, its positive electrode is connected to the positive electrode of the correction capacitor C2 and its negative electrode is connected to the source of the switch tube Q1. The drain of the switch tube Q1 is connected to the negative electrode of the correction capacitor C2 and the ground respectively. The primary side transmitting inductor Lp and the secondary side receiving inductor Ls are coupled to each other through the mutual inductance M. The secondary side receiving inductor Ls is connected in parallel with the secondary side resonant capacitor C4 and then connected to the input end of the high-frequency rectifier bridge Z2. The output end of the high-frequency rectifier bridge Z2 is connected in parallel with the high-frequency filter capacitor C5. The positive and negative poles of the high-frequency filter capacitor C5 are the output ends of the high-voltage DC power supply device, and the output end is connected in parallel with the LED lamp group.

[0021] The circuit formed by connecting the primary resonant capacitor C3 in the high-voltage power supply device and the switch tube Q1 is recorded as the intermediate circuit. One end of the intermediate circuit is the positive electrode of the primary resonant capacitor C3, and the other end is the drain of the switch tube Q1. The topology structure of the low-voltage power supply device is to insert a single-ended flyback circuit between the correction capacitor C2 of the high-voltage power supply device and the intermediate circuit.

[0022] The topology of the single-ended flyback circuit includes a flyback circuit switch tube Q2, an absorption diode D1, an absorption resistor R1, an absorption capacitor C5, a transformer T, a single-ended flyback output diode D2, a first single-ended flyback output filter capacitor C6, a second single-ended flyback output filter capacitor C7, and a single-ended flyback filter inductor L3. The drain of the switch tube Q2 is connected to the ground and the negative electrode of the correction capacitor C2, respectively, and the second single-ended flyback output filter capacitor C7 is connected in parallel with the intermediate circuit.

[0023] After the absorption resistor R1 is connected in parallel with the absorption capacitor C5, one end is connected to the positive electrode of the correction capacitor C2, and the other end is connected to the cathode of the absorption diode D1. One end of the primary side of the transformer T is connected to the positive electrode of the absorption capacitor C5, and the other end is connected to the anode of the absorption diode D1 and the source of the switch tube Q2; one end of the secondary side of the transformer T is connected to the anode of the single-ended flyback output diode D2, and the other end is connected to the negative electrode of the first single-ended flyback output filter capacitor C6 and the second single-ended flyback output filter capacitor C7. The cathode of the single-ended flyback output diode D2 is connected to the positive electrode of the first single-ended flyback output filter capacitor C6 and one end of the single-ended flyback output filter inductor L3, and the other end of the single-ended flyback output filter inductor L3 is connected to the positive electrode of the single-ended flyback output filter capacitor C7.

[0024] In this embodiment, a fuse F is installed between the industrial frequency alternating current power source AC and the electromagnetic interference suppression capacitor C1.

[0025] Figure 4 A connection diagram of the LED lamp group in an embodiment of the present invention is given. Figure 4 It can be seen that the hybrid connection method is adopted in this embodiment, which ensures that the normal operation of other LED lamp beads will not be affected when a single LED lamp bead is damaged.

[0026] In this embodiment, the circuit formed by the electromagnetic interference suppression capacitor C1 and the common-mode inductor L1 is denoted as the electromagnetic interference suppression circuit, the circuit formed by the correction inductor L2 and the correction capacitor C2 is denoted as the power factor correction circuit, the circuit formed by the primary resonant capacitor C3 and the primary transmitting inductor Lp is denoted as the primary resonant network, and the circuit formed by the secondary receiving inductor Ls and the secondary resonant capacitor C4 is denoted as the secondary resonant network. In this embodiment, the working process of the high-voltage DC power supply device is as follows:

[0027] S1, after the AC passes through the fuse F, it is rectified into high-voltage DC through the electromagnetic interference suppression circuit and the power frequency rectifier bridge Z1;

[0028] S2, the output of the power frequency rectifier bridge Z1 is cascaded with the power factor correction to improve the power factor of the circuit;

[0029] S3, converts high-voltage DC into high-frequency AC by controlling the action of the switch tube Q1;

[0030] S4, high-frequency alternating current transfers energy from the primary resonant network to the secondary resonant network through mutual inductance coupling M;

[0031] S5, the secondary side resonant network is cascaded with the high-frequency rectifier bridge Z2, and the high-frequency rectifier bridge Z2 rectifies the high-frequency AC power into DC power;

[0032] S6, the DC power is filtered out by the high-frequency filter capacitor C5 to remove high-frequency interference and then used to power the LED light group.

[0033] In this embodiment, the process of the low-voltage DC power supply device supplying power to the single-transistor inverter circuit is as follows:

[0034] S1, after the AC passes through the fuse F, it is rectified into high-voltage DC through the electromagnetic interference suppression circuit and the power frequency rectifier bridge Z1;

[0035] S2, the output of the power frequency rectifier bridge Z1 is cascaded with the power factor correction to improve the power factor of the circuit;

[0036] S3, cascade-steps down the high-voltage DC power through a single-ended flyback circuit to obtain a low-voltage DC power;

[0037] S4, converts low-voltage DC power into high-frequency AC power by controlling the action of the switch tube Q1;

[0038] S5, high-frequency alternating current transfers energy from the primary resonant network to the secondary resonant network through mutual inductance coupling M;

[0039] S6, the secondary side resonant network is cascaded with the high-frequency rectifier bridge Z2, and the high-frequency rectifier bridge Z2 rectifies the high-frequency AC power into DC power;

[0040] S7, the DC power is filtered out by the high-frequency filter capacitor C5 to remove high-frequency interference and then supplies power to the LED light group.

Claims

1. A LED wireless power supply device based on a single-tube inverter, characterized in that: The single-tube inverter-based LED wireless power supply device includes two topologies. The first topology rectifies the 220V industrial frequency AC power and directly powers the single-tube circuit, and is recorded as a high-voltage DC power supply device. The second topology rectifies the 220V industrial frequency AC power and then uses a flyback circuit to step down the voltage to power the single-tube circuit, and is recorded as a low-voltage DC power supply device. The topological structure of the high-voltage direct current power supply device includes an industrial frequency alternating current power supply AC, an electromagnetic interference suppression capacitor C1, a common-mode inductor L1, an industrial frequency rectifier bridge Z1, a correction inductor L2, a correction capacitor C2, a primary-side resonant capacitor C3, a primary-side transmitting inductor Lp, a secondary-side receiving inductor Ls, a secondary-side resonant capacitor C4, a high-frequency rectifier bridge Z2, a high-frequency filter capacitor C5, a switch tube Q1 and an LED lamp group; the industrial frequency alternating current power supply AC is connected in parallel with the electromagnetic interference suppression capacitor C1 and then connected to the common-mode inductor L1, the other end of the common-mode inductor L1 is connected to the input end of the industrial frequency rectifier bridge Z1, the output end of the industrial frequency rectifier bridge Z1 is connected in parallel with the correction capacitor C2, and the correction inductor L2 is connected to the industrial frequency rectifier bridge Z1. Between the positive electrode of the output end and the positive electrode of the correction capacitor C2, the primary resonant capacitor C3 is connected in parallel with the primary transmitting inductor Lp, and its positive electrode is connected to the positive electrode of the correction capacitor C2, and its negative electrode is connected to the source electrode of the switch tube Q1. The drain electrode of the switch tube Q1 is respectively connected to the negative electrode of the correction capacitor C2 and the ground. The primary transmitting inductor Lp and the secondary receiving inductor Ls are coupled to each other through mutual inductance. The secondary receiving inductor Ls is connected in parallel with the secondary resonant capacitor C4 and then connected to the input end of the high-frequency rectifier bridge Z2. The output end of the high-frequency rectifier bridge Z2 is connected in parallel with the high-frequency filter capacitor C5. The positive and negative electrodes of the high-frequency filter capacitor C5 are the output end of the high-voltage DC power supply device, and this output end is connected in parallel with the LED lamp group; The circuit formed by connecting the primary resonant capacitor C3 and the switch tube Q1 in the high-voltage DC power supply device is recorded as the intermediate circuit. One end of the intermediate circuit is the positive electrode of the primary resonant capacitor C3, and the other end is the drain electrode of the switch tube Q1. The topology structure of the low-voltage DC power supply device is to insert a single-ended flyback circuit between the correction capacitor C2 of the high-voltage DC power supply device and the intermediate circuit. The topology of the single-ended flyback circuit includes a flyback circuit switch tube Q2, an absorption diode D1, an absorption resistor R1, an absorption capacitor C5, a transformer T, a single-ended flyback output diode D2, a first single-ended flyback output filter capacitor C6, a second single-ended flyback output filter capacitor C7, and a single-ended flyback filter inductor L3. The drain of the switch tube Q2 is connected to the ground and the negative electrode of the correction capacitor C2, respectively, and the second single-ended flyback output filter capacitor C7 is connected in parallel with the intermediate circuit.

2. The LED wireless power supply device based on a single-tube inverter according to claim 1, characterized in that: After the absorption resistor R1 is connected in parallel with the absorption capacitor C5, one end is connected to the positive electrode of the correction capacitor C2, and the other end is connected to the cathode of the absorption diode D1. One end of the primary side of the transformer T is connected to the positive electrode of the absorption capacitor C5, and the other end is connected to the anode of the absorption diode D1 and the source of the switch tube Q2; one end of the secondary side of the transformer T is connected to the anode of the single-ended flyback output diode D2, and the other end is connected to the negative electrode of the first single-ended flyback output filter capacitor C6 and the second single-ended flyback output filter capacitor C7. The cathode of the single-ended flyback output diode D2 is connected to the positive electrode of the first single-ended flyback output filter capacitor C6 and one end of the single-ended flyback output filter inductor L3, and the other end of the single-ended flyback output filter inductor L3 is connected to the positive electrode of the single-ended flyback output filter capacitor C7.

3. The LED wireless power supply device based on a single-tube inverter according to claim 2, characterized in that: A fuse F is installed between the industrial frequency AC power supply AC and the electromagnetic interference suppression capacitor C1.

Images