CN102548128B - LED driving method based on high-voltage series-connection current reducing manner - Google Patents
LED driving method based on high-voltage series-connection current reducing manner Download PDFInfo
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- CN102548128B CN102548128B CN201110400156.5A CN201110400156A CN102548128B CN 102548128 B CN102548128 B CN 102548128B CN 201110400156 A CN201110400156 A CN 201110400156A CN 102548128 B CN102548128 B CN 102548128B
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Abstract
The invention discloses a LED driving method based on a high-voltage series-connection current reducing manner. The method comprises the following steps of: connecting multiple receiver nodes in series; transmitting the to-be-transmitted data to the receiver node at the highest level via a coupled isolation circuit by a transmitter node; intercepting the data needed for the receiver node so as to control the LED behavior thereof; transmitting the remaining data stream to the receiver node at the lower level; by that analogy, forming the LED driving mode based on the series-connection current reducing manner. The method overcomes the defect that the conventional parallel circuit needs larger current, and can ensure the relative stability of the voltage occupied by the receiver node at each level; and the method can light the LED in any node just by sending an instruction, so the method is simple to control and has outstanding effects.
Description
Technical field
The present invention relates to a kind of LED driving method based on high-voltage series-connection current reducing manner, it is exactly specifically the demonstration node that via coupling buffer circuit, transmission data flow is sent to plural serial stage, nodes at different levels only intercept the control data relevant to current receiver to drive LED at the corresponding levels to show, and remaining data flow is sent to downstream site processing.
Background technology
Along with the development of technology and the raising of people's living standard, usually can see that in some large-scale public places of entertainment thousands of LED lamp is in flicker.But conventionally between these LED lamps, adopt connected mode in parallel, flicker pattern is comparatively single and be difficult to control break, is difficult to attract people's sight.In the time that the number needs of LED lamp further increases, such as in the three-dimensional moving image based on dot matrix shows, need tens thousand of even more nodes, the in the situation that of multinode parallel connection so, the required output-current rating of power supply is very large, greatly increased the caloric value of wire, make its be easy to damage and wiring cost higher.Therefore a kind of LED driving method based on high-voltage series-connection current reducing manner that the present invention proposes can become the new way of this area research.
Summary of the invention
Goal of the invention: technical problem to be solved by this invention is the deficiency that the demonstration limited amount that causes due to current limited for traditional LED lamp and Show Styles are single and be difficult to control break, and a kind of LED driving method based on high-voltage series-connection current reducing manner is provided.
In order to solve the problems of the technologies described above, the invention discloses a kind of LED driving method based on high-voltage series-connection current reducing manner, comprise the following steps:
In the present invention, preferably, described receiver node comprises voltage stabilizing circuit, processor, and coupling buffer circuit, waits impedance replacement circuit and display circuit;
Described voltage stabilizing circuit is mainly made up of voltage-stabiliser tube and electrochemical capacitor, for stablizing the operating voltage of individual node, makes its still steadily effectively work in the time of plural serial stage; Node the United Nations General Assembly's capacitance electrochemical capacitor, further stablize each node operating voltage, and the data sampling that may cause due to the shake of level while overcoming voltage jump is made mistakes;
Described coupling buffer circuit is for overcoming upper and lower two-stage node due to the problems that cause signals not directly to be connected and to send or receive by processor with reference to ground voltage difference.
Described processor, for receiving the data flow sending over via coupling buffer circuit, intercepts the demonstration data of this grade of required control of receiver node LED lamp, and sends to subordinate's receiver node to receive remaining data flow; Show according to data intercept position driving LED lamp;
The described impedance replacement circuit of waiting is by processor control, when LED lamp is by bright dimmed and carry out impedance replacement when sending the buffer circuit saltus step that data cause, unique all the time to guarantee each receiving node impedance, current constant, voltage stabilization.
In the present invention, preferably, described Frame is by synchrodata and show that data form, and synchrodata makes its preparation reception show data for Notification Sink node.Arrange the traffic rate between each node, for preventing that sampling from makeing mistakes, postpone to sample first after half period, and sampling should be carried out every one-period; Described demonstration packet, containing the required control data of all series connection receiver nodes, shows for controlling its LED lamp.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is done further and illustrated, above-mentioned and/or otherwise advantage of the present invention will become apparent.
Fig. 1 is the connected mode between upper and lower two-stage receiver node.
Fig. 2 is the data frame format transmitting between receiver node.
Fig. 3 is the flow chart of whole system.
Embodiment:
The invention discloses a kind of LED driving method based on high-voltage series-connection current reducing manner, comprise the following steps:
In the present invention, step 1, described receiver node is by voltage stabilizing circuit, coupling buffer circuit, processor, waits impedance replacement circuit and display circuit composition.When series connection, be using the high potential of subordinate's receiver node as the required electronegative potential of higher level's receiver node, by that analogy, form multistage receiver node series connection.
In the present invention, step 2, described buffer circuit, can use optocoupler to realize; Send to the method for subordinate's receiver node to be specially from higher level's receiver node Frame, optocoupler is connected across to upper and lower two-stage receiver, higher level MCU sends I/O mouth and connects optical diode end, the MCU of subordinate receives I/O mouth and connects optical transistor end, thereby higher level and subordinate are isolated completely, as shown in Figure 1.Higher level can send high and low level by transmission I/O mouth and control subordinate's reception I/O mouth reception high (or low), low (or high) level, thereby reaches the object of the non-interfering frame that transmits and receive data of the superior and the subordinate's receiver node.Resistance 1 described in Fig. 1, resistance 2 place I/O branch roads are conducting to cut-off and LED carries out impedance replacement by bright when dimmed at optocoupler respectively in addition, constant to guarantee the impedance of each node, the voltage stabilization at node two ends.It should be noted that in addition optocoupler pipe diode termination pull down resistor in the given specific implementation of Fig. 1, triode termination pull-up resistor, institute's higher level sends " 0 " or " 1 ", and what subordinate received is " 1 " or " 0 ".
More particularly, when the invention process, control I/O mouth send a string " 0/1 " data flow by MCU, this data flow comprises 1 of initial separator, the data bit N position of frame, and wherein N is series connection node number, as shown in Figure 2.Here it should be pointed out that transmission rate and sample frequency between receiver nodes at different levels should be consensus.When concrete reception, in the time that the receiving port of receiver detects the rising edge of higher level's receiver transmission, postpone to sample first after the half period, and every one-period, to receiving I/O mouth, sampling should be carried out afterwards, stops until receiving N position.When receiver node receives behind total data position, intercept the lowest order (agreement lowest order is the required LED control bit of current receiver node) of received data stream, " 0 " represents to close LED lamp, opens resistance 2 place I/O branch roads; " 1 " represents to turn on LED lamp, closes resistance 2 place I/O branch roads.Then all data bit are moved right to 1, left side highest order mends 0, send to subordinate's receiver node to receive the N bit data position (figure place is constant) newly forming, the benefit of doing is like this handling procedure of all nodes all consistent, and each node series connection does not exist sequencing problem.By that analogy, realize the object of controlling the flicker of arbitrary node receiver LED lamp.
In the present invention, preferably, do not use parity check bit and stop bit, in case transfer of data is while makeing mistakes, transmission stops immediately, cannot observe a subsequent node LED lamp flicker that makes mistakes, the reason of clearly makeing mistakes.
In the present invention, whole flow process as shown in Figure 3, comprises the steps:
Step 6, waits for that transmitter node sends Frame again.
The invention provides a kind of thinking and solution of the LED driving method based on high-voltage series-connection current reducing manner; method and the approach of this technical scheme of specific implementation are a lot; as Frame reset, is adopted PWM data-driven LED etc.; the above is only the preferred embodiment of the present invention; should be understood that; for those skilled in the art; under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.In the present embodiment not clear and definite each part all available prior art realized.
Claims (1)
1. the LED driving method based on high-voltage series-connection current reducing manner, is characterized in that, comprises the following steps:
Step 1, by multiple receiver node series connection;
Step 2, sends to highest receiver node to receive via coupling buffer circuit required transmission Frame by transmitter node;
Step 3, the lowest order that each receiver node intercepts received data stream shows with the LED that controls this node;
Step 4, sends to subordinate's receiver node to receive the remaining data data flow that 1, left side highest order mends the N position that 0 rear composition is new that moves right;
Described receiver node comprises voltage stabilizing circuit, processor, and coupling buffer circuit, waits impedance replacement circuit and display circuit;
Described processor receives the Frame that higher level's receiver node sends, and intercepts current receiver node desired data and shows to control its LED lamp, and remaining traffic is sent to subordinate's receiver; The method of each node intercepting self desired data is in the time that the receiving port of receiver detects the rising edge of higher level's receiver transmission, postpone to sample first after the half period, and every one-period, to receiving I/O mouth, sampling should be carried out afterwards, stop until receiving N position, the N bit data stream that higher level's receiver node is sended over all receives storage, then data intercept stream lowest order, retain original data stream length and all data bit are moved right to 1, left side highest order mends 0, sends to subordinate's receiver node to receive the N bit data position newly forming; The LED display packing of controlling node is to be that the 0 or 1 corresponding LED of control extinguishes or lights according to the data flow lowest order intercepting;
Described coupling buffer circuit is connected across between the upper and lower two-stage node of receiver, the impact bringing due to epd when eliminating data communication between the upper and lower two-stage node of transmitter and receiver or receiver, prevents that data transmission fault and node voltage from distributing inequality, beating and damage node;
Described wait impedance replacement circuit respectively at LED lamp by bright dimmed and carry out impedance replacement because sending when data cause buffer circuit saltus step, unique all the time to guarantee each receiver node impedance, current constant, voltage stabilization;
Described voltage stabilizing circuit is for stablizing the operating voltage of each series connection node;
Described Frame shows that by 1 bit synchronization data and N position data form;
Described N position shows data, and its figure place N is determined by the receiver node number of connecting; Each data can be " 0 " or " 1 ", and " 0 " represents to close LED lamp, opens resistance 2 place I/O branch roads; " 1 " represents to turn on LED lamp, closes resistance 2 place I/O branch roads;
Described LED lamp when dimmed, causes this node voltage unstable for overcoming this I/O mouth curent change by bright, opens the I/O branch road with impedances such as this display circuits when LED lamp is dimmed; In like manner, send when " 0/1 " data at coupling buffer circuit, also substitute by waiting impedance branch road to carry out impedance, when guaranteeing to send data, the electric current that flows through each node is unique all the time.
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| CN102970105B (en) * | 2012-11-09 | 2015-12-02 | 深圳市晟碟半导体有限公司 | A kind of transmission method of LED chip cascade signal and transmission system |
| CN109188444B (en) * | 2018-10-10 | 2023-04-11 | 中国船舶重工集团公司七五0试验场 | Submarine underwater acoustic response type positioning method and system based on synchronous signal system |
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| WO2009071000A1 (en) * | 2007-11-30 | 2009-06-11 | Zhejiang Tianyu Light Decorations Co., Ltd. | An intelligent digital decorative lamp device |
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| CN201349343Y (en) * | 2008-12-15 | 2009-11-18 | 康佳集团股份有限公司 | Data transfer circuit of LED control system |
| CN101815380A (en) * | 2010-02-11 | 2010-08-25 | 湛引根 | LED tree lamp array control device and method |
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| CN1787707A (en) * | 2005-10-13 | 2006-06-14 | 上海国皓电子有限公司 | Non addressing type inserted 2 wire communication and control apparatus thereof |
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| WO2009071000A1 (en) * | 2007-11-30 | 2009-06-11 | Zhejiang Tianyu Light Decorations Co., Ltd. | An intelligent digital decorative lamp device |
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