CN210225819U

CN210225819U - Unidirectional power line carrier LED dimming system

Info

Publication number: CN210225819U
Application number: CN201920961770.0U
Authority: CN
Inventors: Yang Ye; 叶阳; Fuzhong Li; 李福忠
Original assignee: Shandong Zhongda Power Technology Co Ltd
Current assignee: Shandong Zhongda Power Technology Co Ltd
Priority date: 2019-06-24
Filing date: 2019-06-24
Publication date: 2020-03-31
Anticipated expiration: 2029-06-24

Abstract

The utility model discloses an one-way power line carrier LED dimming system, including signal modulation circuit and signal demodulation circuit, signal demodulation circuit is connected with signal modulation circuit's output through the transmission line, and signal modulation circuit includes a power supply main power source, and disconnection or short circuit control through semiconductor switch stabilize the loading power and load to on the power supply main power source, form the high-low signal switching on the basis of the power supply main power source, including a high pass filter in the signal demodulation circuit, can ignore the slow change of DC power supply main power supply voltage and/or the power frequency alternating part of AC power supply main power supply voltage, handle the signal jump border that the high-low signal switched is gathered and is reduced into communication signal, through communication signal carries out dimming control to LED lighting system. The LED dimming device aims to solve the problems that the existing LED dimming technology cannot meet the requirements of no dimming light, reliable dimming, low cost, suitability for various power systems and the like.

Description

Unidirectional power line carrier LED dimming system

Technical Field

The utility model relates to a LED control field especially relates to a LED wireless dimming system.

Background

The existing LED dimming technologies are classified into the following categories:

dimming through dimming lines: for example, the modes of 0-10V, PWM and the like are adopted, and the defects that light adjusting lines need to be added, and troubles are brought to construction;

by wireless dimming: for example, dimming is performed through bluetooth, Zigbee, Wifi and the like, the wireless scheme is applied more indoors, but for outdoors, the wireless dimming effect is poor due to the fact that the lamps are far away and distributed along a long line, and therefore the application is not many;

power carrier dimming: the power carrier schemes are divided into two types: one is a single lamp controller scheme: namely, a single lamp controller is added outside each power supply, a power carrier module is arranged inside the single lamp controller, and the power supply controlled by the single lamp controller is dimmed through a dimming line. The scheme has the advantages that the power carrier wave dimming effect can be directly realized by directly adding the single lamp controller on the basis of the common dimming power supply, and besides dimming, the data feedback of the lamp state can also be realized; the disadvantage is the high cost; the other is a built-in carrier module scheme: the LED driving power supply is integrated with a power carrier module, achieves the same effect as the single-lamp controller, has the advantages of lower cost than the single-lamp controller, and has the defects of needing a customized driving power supply with a built-in carrier module, and the current driving power supplies are few and have smaller selectable range;

besides the above common dimming schemes, there are some special schemes for dimming in a manner of modulating dc supply voltage for a dc supply system, including: chinese patent CN 101778514A; CN 102395231A; CN 103763833A.

These schemes cannot simultaneously satisfy the requirements of no-dimming light, reliable dimming, low cost, suitability for various power systems and the like. From the perspective of meeting functional requirements, there are some schemes that have no dimming line and that can reliably dim light, such as a scheme that uses a single-end controller or a built-in power carrier module to implement the above functions, but such schemes have a high cost; the three patents have low cost, and can realize reliable dimming without a dimming line, but the three patents are only suitable for a direct current power supply system with constant voltage output and cannot be suitable for a direct current system with multi-pulse rectification, and the system is characterized in that the direct current output voltage is not necessarily a constant value, but can be slowly changed. The difficulty to solve is how to load the communication signal which can be identified by the far end of the line on the slowly-changing direct-current voltage. The solutions provided in these several patents do not solve this problem.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims at providing an one-way power line carrier LED dimming system. The LED dimming device aims to solve the problems that the existing LED dimming technology cannot meet the requirements of no dimming light, reliable dimming, low cost, suitability for various power systems and the like.

In order to achieve the above object, the utility model provides an one-way power line carrier LED dimming system, a serial communication port, include: the signal demodulation circuit comprises a high-pass filter, the slow change of the voltage of the direct current power supply main power supply or the power frequency alternating part of the voltage of the alternating current power supply main power supply is omitted, the signal jump edge of the high-low signal switching is collected and restored into a communication signal, and the dimming control is carried out on the LED lighting system through the communication signal.

Optionally, the regulated load power supply is a low voltage dc power supply.

Optionally, the stable loading power source is a battery or a super capacitor, and the semiconductor switch is a back-to-back bidirectional switch. Optionally, the signal modulation circuit further has a charge-discharge circuit for preventing the battery or the super capacitor from being overcharged or undervoltage.

Optionally, the number of the semiconductor switches is two, i.e., a switch S1 and a switch S2, when the switch S2 is turned on and the switch S1 is turned off, the steady-state loaded power is not loaded to the power supply main power source, and when the switch S1 is turned on and the switch S2 is turned off, the steady-state loaded power is loaded to the power supply main power source.

Optionally, the high pass filter includes a capacitor C1, a resistor R1, a resistor R2, a resistor R3, and an operational amplifier OP 1. The capacitor C1 and the resistor R1 determine the frequency band of the filter, the voltage of signal jump needs to be reserved, and the voltages of direct current slow change and alternating current power frequency are filtered. The operational amplifier OP1 sets an appropriate amplification factor through the resistor R2 and the resistor R3.

Optionally, the signal demodulation circuit includes a comparator COMP1, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, and a photo-coupler Opto1, a reference voltage is set through the resistor R4 and the resistor R5, the output of the operational amplifier OP1 exceeds the reference voltage, the output is low and is lower than the reference voltage, the output is high, the resistor R6 sets a hysteresis interval to prevent oscillation of the comparator COMP1, the photo-coupler Opto1 isolates the signal input part from the circuit of the signal processing part, the resistor R7 is used for setting the working current of the photo-coupler input diode, the resistor R8 is a pull-up resistor and is electrically coupled to the collector of the output triode of the photo-coupler Opto1 as the output of the whole circuit, and the signal name is Data.

The utility model provides an among the technical scheme, whether the disconnection or short circuit control through high-speed semiconductor switch stabilize the loading power and load on the power supply main power source, form the high-low signal switching on the basis of the power supply main power source, through high pass filter, restore the signal border of high-speed jump to communication signal, because there is showing the difference in the signal of high-speed jump and the low-speed change of direct current main power source and the power frequency alternation of alternating current main power source, the low-speed change of direct current main power source and the power frequency alternation of alternating current main power source can not misunderstanding as the signal, and the signal of high-speed jump can be asked to be accurate the catching. On the other hand, the back-end circuit determines whether a signal is loaded according to whether a jump exists in the output voltage instead of determining whether the signal is loaded according to the absolute value of the output voltage. Thus, there is no requirement for a specific amplitude of the output voltage, thereby improving system adaptability.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a circuit diagram of a signal modulation circuit applied to a dc system according to an embodiment of the present invention;

fig. 2 is a circuit diagram of a bidirectional loading signal modulation circuit applied to an ac system according to an embodiment of the present invention;

fig. 3 is a circuit diagram of a bidirectional loading signal modulation circuit applied to a dc system according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a signal demodulation circuit according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In addition, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or cannot be realized, the combination of such technical solutions should be considered to be absent, and is not within the protection scope of the present invention.

The embodiment provides a unidirectional power carrier LED dimming system, including: the signal demodulation circuit comprises a high-pass filter, the slow change of the voltage of the direct current power supply main power supply and/or the power frequency alternating part of the voltage of the alternating current power supply main power supply are ignored, the signal jump edge of the high-low signal switching is collected and restored into a communication signal, and the dimming control of the LED illumination system is carried out through the communication signal.

The basic principle of the signal modulation circuit is to apply a low-voltage constant-voltage source to the output voltage according to the communication requirement. Different implementations may exist for specific applications.

In one embodiment, referring to fig. 1, the power supply system is a dc power supply system, Vdc is a system voltage, the isolated carrier power Vc is a voltage for a carrier, and the MOS switches S1 and S2 are used to load the carrier power onto the output voltage Vout. When the switch S2 is turned on and the switch S1 is turned off, the output voltage Vout is Vdc; when the switch S1 is turned on and the switch S2 is turned off, the output voltage Vout becomes Vdc + Vc. The logic for the operation of the switches in the circuit is shown in table 1.

TABLE 1 switch run logic

Referring to fig. 4, Vin + and Vin-in fig. 4 are input voltages respectively corresponding to positive and negative terminals of Vout in fig. 1. The capacitor C1, the resistors R1, R2, R3 and the operational amplifier OP1 form an active high-pass filter, the capacitor C1 and the resistor R1 determine the frequency band of the filter, the voltage of signal jump needs to be reserved, the voltages of direct current slow change and alternating current power frequency are filtered, and the operational amplifier Op1 sets a proper amplification factor through the resistors R2 and R3. COMP1 is a comparator that sets a reference voltage through resistors R4 and R5, the output of the operational amplifier exceeds the reference voltage, and the output is low; below the reference voltage, the output is high. Resistor R6 sets a hysteresis interval to avoid comparator oscillation. The Opto1 is an Opto coupler that isolates the signal input section from the circuitry of the signal processing section. The resistor R7 is used for setting the working current of the optical coupler input diode. The resistor R8 is a pull-up resistor and is connected to the collector of the optocoupler output triode to be used as the output of the whole circuit, and the signal name is Data. The key of the circuit is that a high-pass filter captures a jump signal, a comparator shapes the signal, and finally an optical coupler performs isolation transmission. The relationship between the level state of Data and the input voltage is shown in table 2.

TABLE 2 relationship of State of Data to input Voltage

Input voltage	Representative data	Data states
			Vdc (or Vac) + Vc	1	High level
Vdc (or Vac)	0	Low level of electricity

It is emphasized that the back-end circuit does not determine whether a signal is loaded according to the absolute value of the output voltage Vout, but determines whether the signal is loaded according to whether the Vout has a jump with an amplitude Vc. Thus, there is no requirement for a specific magnitude of Vout, thereby improving system adaptability.

In one embodiment, referring to fig. 2, the signal modulation circuit diagram is shown, the power supply system is an ac power supply system, the loading power source is a battery or a super capacitor, and the MOS transistor switch is a back-to-back bidirectional switch. The purpose of the arrangement is to adapt to bidirectional current under an alternating current condition, and further, to avoid overcharge or undervoltage of a battery or a super capacitor, a charge and discharge circuit capable of maintaining stable loading power supply voltage is arranged.

In one embodiment, referring to fig. 3, the signal modulation circuit diagram shows that the power supply system is a dc power supply system, the loading power source is a battery or a super capacitor, and the MOS transistor switch does not need to be a back-to-back bidirectional switch because there is no bidirectional current. Furthermore, in order to avoid undervoltage of the battery or the super capacitor, a charging circuit capable of maintaining the voltage of the loading power supply stable is arranged.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A unidirectional power carrier LED dimming system, comprising: the signal demodulation circuit comprises a high-pass filter, the slow change of the voltage of the direct current power supply main power supply and/or the power frequency alternating part of the voltage of the alternating current power supply main power supply are ignored, the signal jump edge of the high-low signal switching is collected and restored into a communication signal, and the dimming control of the LED illumination system is carried out through the communication signal.

2. The dimming system of claim 1, wherein the regulated load power supply is a low voltage dc power supply.

3. The dimming system of claim 1, wherein the regulated power supply is a battery or a super capacitor and the semiconductor switch is a back-to-back bi-directional switch.

4. The dimming system of claim 3, wherein the signal modulation circuit further comprises a charge and discharge circuit for preventing the battery or super capacitor from being overcharged or undervoltage.

5. The dimming system of claim 1, wherein the semiconductor switches are two, switch S1, switch S2, and wherein the regulated load power is not applied to the power supply when switch S2 is on and switch S1 is off, and wherein the regulated load power is applied to the power supply when switch S1 is on and switch S2 is off.

6. A dimming system as claimed in any one of claims 1 to 5, wherein the high pass filter comprises a capacitor C1, a resistor R1, a resistor R2, a resistor R3 and an operational amplifier OP1, the capacitor C1 and the resistor R1 are used for determining the frequency band of the high pass filter, the signal jump voltage of the high-low signal switching is required to be preserved, meanwhile, the slow change of the DC power supply main power voltage and/or the power frequency alternating part of the AC power supply main power voltage are filtered, and the operational amplifier OP1 sets the appropriate amplification factor through the resistor R2 and the resistor R3.

7. The dimming system as claimed in claim 6, wherein the signal demodulation circuit comprises a comparator COMP1, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8 and a photo coupler Opto1, a reference voltage is set through the resistor R4 and the resistor R5, the output of the operational amplifier OP1 exceeds the reference voltage, is low and is lower than the reference voltage, the output is high, the resistor R6 sets a hysteresis interval to avoid oscillation of the comparator COMP1, the photo coupler Opto1 isolates the signal input part from the circuit of the signal processing part, the resistor R7 is used for setting the working current of the photo coupler input diode, the resistor R8 is a pull-up resistor, and is connected to the collector of the output triode of the photo coupler Opto1 as the output of the whole circuit, and the signal name is Data.