LED controller for high-voltage signal transmission

Abstract

The utility model discloses an LED controller of high voltage transmission signal, including power supply module, light control module and carrier code module, the power supply module converts the 220V AC power supply voltage into the DC positive voltage and the DC negative voltage that have the same level of voltage to ground and connects the DC positive voltage and the DC negative voltage to the carrier code module, the carrier code module is controlled according to the signal input by the light control module, and the carrier code module transmits the signal to the light control module. A continuous positive and negative changing voltage waveform is output at the output end, a control signal is transmitted through voltage change, electric energy is transmitted at the same time, and compared with an existing power line carrier mode, the power line carrier control circuit has the advantages of being small in interference, long in transmission distance, simple in circuit structure, low in equipment cost and the like.

Description

Technical Field

[0001] The utility model relates to a lighting fixture, in particular to a controller of the lighting fixture. Background Art

[0002] In the field of outdoor lighting, multiple LED lights connected in series and parallel are often used to form a light string to achieve dynamic equivalents such as color and brightness changes, and to present text patterns or marquees. The controller output end of these lamps has two power lines and at least two signal lines. This requires at least four wires between the controller and the load. These wires are hundreds of meters or even longer, which will undoubtedly increase the cost. Although there are relatively mature DC or AC power carrier control methods, the modulation and decoding circuits required by these control methods are relatively complex, and the equipment cost should be relatively expensive. Summary of the invention

[0003] In order to overcome the deficiencies of the prior art, the utility model provides a LED controller with a simple circuit structure and low price and capable of transmitting high-voltage signals.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] The overall concept of the present application is: the power supply module converts the 220V AC power supply voltage into a DC positive voltage and a DC negative voltage with equal voltage level to the ground (negative pole of the DC voltage) and connects them to the code-carrying module. The code-carrying module has two branches, one is a positive voltage circuit and the other is a negative voltage circuit. Semiconductor switching devices are connected in series in these two circuits respectively. The control signal sent by the lighting control module is processed and used to control the on and off of the semiconductor switching devices in the two circuits, so that the code-carrying module outputs a voltage waveform with continuous positive or negative voltage changes. The reference point of this positive and negative voltage is the negative pole of the DC voltage. The voltage waveform changes with the negative zero voltage of the DC voltage as the central axis. For signal transmission, the DC positive voltage DC+ output by the code module is defined as 1, and the DC negative voltage DC- is defined as 0. The positive and negative changes in voltage output a string of codes composed of 1 and 0. The code is interpreted at the load end in conjunction with the clock signal to restore the control signal and provide the control signal to the load. For power transmission, since the voltage levels of the DC positive voltage DC+ and the DC negative voltage DC- are equal, only a simple rectifier and filter circuit is needed to restore the stable DC high voltage to power the load.

[0006] The technical solution adopted by the utility model to solve its technical problems is as follows:

[0007] A LED controller for high-voltage signal transmission includes a power module, a lighting control module and a code-carrying module. Power module: the input side is connected to alternating current AC, and the output side has a DC positive voltage DC+, a DC negative electrode GND, a DC negative voltage DC- and a working voltage VCC, and the absolute values ​​of the DC positive voltage DC+ and the DC negative voltage DC- relative to the DC negative voltage DC- are equal. Lighting control module: the working voltage VCC and the DC negative electrode GND are obtained from the power module, and a lighting control signal W is output. Code-carrying module: the input end obtains the DC positive voltage DC+, the DC negative electrode GND, the DC negative voltage DC- and the working voltage VCC from the power module, and the output end has two terminals, namely, positive and negative voltages ±V and the DC negative electrode GND, and the waveform of the positive and negative voltages ±V output is a continuous waveform. Further, the waveform of the positive and negative voltages ±V output is a continuous square wave relative to the DC negative voltage DC-.

[0008] Furthermore, the code-carrying module has a positive pressure circuit and a negative pressure circuit, a switch device Q1 is connected in series in the positive pressure circuit, a switch device Q2 is connected in series in the negative pressure circuit, an input end of the switch device Q1 is connected to the DC positive voltage DC+, an input end of the switch device Q2 is connected to the DC negative voltage DC-, output ends of the switch device Q1 and the switch device Q2 are connected in parallel and connected to the positive and negative voltages ±V, and control terminals of the switch device Q1 and the switch device Q2 are connected to the light control signal W.

[0009] A reverse isolation device is connected between the switch device Q1 and the positive and negative voltages ±V, the reverse isolation device is a voltage regulator diode D1, the switch device Q1 is a MOS tube Q1, the switch device Q2 is a MOS tube Q2, and the code-carrying module is a driver chip U1.

[0010] The D pole of the MOSFET Q1 is connected to the DC positive voltage DC+, the S pole is connected to the anode of the voltage-stabilizing diode D1, and the G pole is connected to the first control output terminal HO of the driving chip U1; the D pole of the MOSFET Q2 is connected to the cathode of the voltage-stabilizing diode D1, the S pole is connected to the DC negative voltage DC-, and the G pole is connected to the second control output terminal VS of the driving chip U1; the contact point of the voltage-stabilizing diode D1 and the MOSFET Q2 is connected to the positive and negative voltages ±V, a current-limiting resistor R1 is connected in series between the first control output terminal HO of the driving chip U1 and the G pole of the MOSFET Q1, and a current-limiting resistor R2 is connected in series between the second control output terminal VS of the driving chip U1 and the G pole of the MOSFET Q2.

[0011] The beneficial effects of the utility model are as follows: the power module of the utility model converts the 220V AC power supply voltage into DC positive voltage and DC negative voltage with equal voltage level to the ground (DC negative pole GND) and connects them to the code carrier module. The code carrier module outputs a continuous positive and negative voltage waveform at the output end according to the signal control input by the lighting control module, transmits the control signal by the voltage change, and transmits electric energy at the same time. Compared with the current power carrier method, it has the advantages of small interference, long transmission distance, simple circuit structure, low equipment cost, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0013] Figure 1 It is a circuit principle block diagram of the utility model.

[0014] Figure 2 is a circuit diagram of an embodiment. DETAILED DESCRIPTION

[0015] Reference Figure 1 , Figure 2 , a LED controller for high-voltage signal transmission, including a power module, a lighting control module and a code-carrying module. Power module: the input side is connected to alternating current AC, and the output side has a DC positive voltage DC+, a DC negative electrode GND, a DC negative voltage DC- and a working voltage VCC, and the absolute values ​​of the DC positive voltage DC+ and the DC negative voltage DC- relative to the DC negative voltage DC- are equal. Lighting control module: the working voltage VCC and the DC negative electrode GND are obtained from the power module, and a lighting control signal W is output. Code-carrying module: the input end obtains the DC positive voltage DC+, the DC negative electrode GND, the DC negative voltage DC- and the working voltage VCC from the power module, and the output end has two terminals, namely, positive and negative voltages ±V and DC negative electrode GND, the waveform of the positive and negative voltages ±V output is a continuous waveform, and further, the waveform of the positive and negative voltages ±V output is a continuous square wave relative to the DC negative voltage DC-.

[0016] The principle of the present application is different from the current power line carrier technology. In the current power line carrier technology, the positive and negative lines in the DC carrier are unchanged, and the neutral line and the live line in the AC carrier are also unchanged. In the present application, the code-carrying module outputs changing positive and negative pressures. When the waveform output by the code-carrying module is a positive pressure waveform, the positive pressure waveform and the ground wire form a loop, but when the waveform output by the code-carrying module is a negative pressure waveform, the ground wire and the negative pressure waveform form a loop.

[0017] It should be noted that in the present invention, the absolute values ​​of the DC positive voltage DC+ and the DC negative voltage DC- relative to the DC negative voltage DC- are equal. For example, if the DC positive voltage is +240V, then the DC negative voltage is -240V. In this way, the voltage can be reversed through the rectifier bridge later. If the positive and negative voltage levels are different, a transformer module needs to be added on the load side to obtain stable DC power.

[0018] When there is no need to transmit the light control signal, the waveform output by the code carrier module is a constant DC positive voltage or DC negative voltage waveform. When the light control signal needs to be sent, the positive and negative voltages are switched. The control method of this application is unidirectional, that is, the LED controller can only send control signals to the load, but cannot receive signals sent by the load. It is suitable for outdoor LED lamps and other fields that only need to send unidirectional command control modes without feedback.

[0019] The power module can be external or integrated with the code carrier module. The lighting control module can be a remote control receiving circuit or a 485 interface or USB interface for connecting to a control host such as a computer host.

[0020] The circuit of the utility model is shown in FIG. Figure 2 The code-carrying module has a positive pressure circuit and a negative pressure circuit. A switch device Q1 is connected in series in the positive pressure circuit, and a switch device Q2 is connected in series in the negative pressure circuit. The input end of the switch device Q1 is connected to the DC positive voltage DC+, and the input end of the switch device Q2 is connected to the DC negative voltage DC-. The output ends of the switch device Q1 and the switch device Q2 are connected in parallel and connected to the positive and negative voltages ±V. The control terminals of the switch device Q1 and the switch device Q2 are connected to the light control signal W. A reverse isolation device is connected between the switch device Q1 and the positive and negative voltages ±V, and the reverse isolation device is a voltage-regulating diode D1.

[0021] In this embodiment, the switch device Q1 is a MOS tube Q1, the switch device Q2 is a MOS tube Q2, the code-carrying module is a driver chip U1, and the model of the driver chip U1 is PB6908A. The VCC pin of the driver chip U1 is connected to the working voltage VCC, the VB pin is connected to the working voltage VCC through the voltage-stabilizing diode D2, and the HO pin is connected to the G pole of the MOS tube Q1 through the resistor R1; the VS pin is divided into two paths, one path is connected to the positive and negative voltages ±V, and the other path is connected to the junction of the voltage-stabilizing diode D2 and the VB pin through the capacitor C1, the LO pin is connected to the G pole of the MOS tube Q2 through the resistor R2, the HIN pin is connected to the HIN end of the lighting control module, the LIN pin is connected to the LIN end of the lighting control module, and the COM end is connected to the DC negative voltage DC-.

[0022] The working power supply VCC of the driver chip U1 comes from the power module, and can also be powered from the DC positive voltage DC+ through voltage transformation. After the driver chip U1 receives the light control signal W (HIN, LIN) signal from the light control module, it converts the signal and outputs high and low levels from the HO and LO pins to control the conduction and cutoff of the MOS tube Q1 and the MOS tube Q2, so that the positive and negative voltages ±V obtain positive or negative voltages. The waveforms of the positive and negative voltages are continuous, so that the load end behind will not experience power failure.

[0023] The above implementation modes cannot limit the protection scope of the present invention. The equivalent modifications and changes made by those skilled in the art without departing from the overall concept of the present invention are still within the scope of the present invention.

Claims

1. A LED controller for high voltage signal transmission, characterized in that include: Power supply module: the input side is connected to alternating current AC, and the output side has a DC positive voltage DC+, a DC negative electrode GND, a DC negative voltage DC- and a working voltage VCC, wherein the absolute values ​​of the DC positive voltage DC+ and the DC negative voltage DC- relative to the DC negative voltage DC- are equal; Lighting control module: the working voltage VCC and the DC negative electrode GND are obtained from the power module, and the lighting control signal W is output; Code-carrying module: The input end obtains the DC positive voltage DC+, the DC negative pole GND, the DC negative voltage DC- and the working voltage VCC from the power supply module, and the output end has two terminals, namely the positive and negative voltages ±V and the DC negative pole GND, and the waveforms of the positive and negative voltages ±V output are continuous waveforms.

2. The LED controller for high voltage signal transmission according to claim 1, characterized in that The waveforms of the positive and negative voltages ±V output are continuous square waves relative to the direct current negative voltage DC-.

3. The LED controller for high voltage signal transmission according to claim 1 or 2, characterized in that The code-carrying module has a positive pressure circuit and a negative pressure circuit. A switch device Q1 is connected in series in the positive pressure circuit, and a switch device Q2 is connected in series in the negative pressure circuit. The input end of the switch device Q1 is connected to the DC positive voltage DC+, and the input end of the switch device Q2 is connected to the DC negative voltage DC-. The output ends of the switch device Q1 and the switch device Q2 are connected in parallel and connected to the positive and negative voltages ±V. The control terminals of the switch device Q1 and the switch device Q2 are connected to the light control signal W.

4. The LED controller for high voltage signal transmission according to claim 3, characterized in that A reverse isolation device is connected between the switch device Q1 and the positive and negative voltages ±V.

5. The LED controller for high voltage signal transmission according to claim 4, characterized in that The reverse isolation device is a voltage stabilizing diode D1.

6. The LED controller for high voltage signal transmission according to claim 5, characterized in that The switch device Q1 is a MOS tube Q1, the switch device Q2 is a MOS tube Q2, and the code-carrying module is a driving chip U1.

7. The LED controller for high voltage signal transmission according to claim 6, characterized in that The D pole of the MOSFET Q1 is connected to the DC positive voltage DC+, the S pole is connected to the anode of the voltage regulator diode D1, and the G pole is connected to the first control output terminal HO of the driving chip U1; the D pole of the MOSFET Q2 is connected to the cathode of the voltage regulator diode D1, the S pole is connected to the DC negative voltage DC-, and the G pole is connected to the second control output terminal VS of the driving chip U1; the contact point of the voltage regulator diode D1 and the MOSFET Q2 is connected to the positive and negative voltages ±V.

8. The LED controller for high voltage signal transmission according to claim 7, characterized in that A current-limiting resistor R1 is connected in series between the first control output terminal HO of the driving chip U1 and the G pole of the MOSFET Q1.

9. The LED controller for high voltage signal transmission according to claim 7, characterized in that A current-limiting resistor R2 is connected in series between the second control output terminal VS of the driving chip U1 and the G pole of the MOS tube Q2.

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