CN102548128A - 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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- CN102548128A CN102548128A CN2011104001565A CN201110400156A CN102548128A CN 102548128 A CN102548128 A CN 102548128A CN 2011104001565 A CN2011104001565 A CN 2011104001565A CN 201110400156 A CN201110400156 A CN 201110400156A CN 102548128 A CN102548128 A CN 102548128A
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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 that subtracts stream mode based on high-pressure series; Specifically be exactly to send the demonstration node that data flow sends to plural serial stage via the coupling buffer circuit; The control data that a nodes at different levels intercepting is relevant with current receiver shows to drive LED at the corresponding levels, and remaining data flow is sent to the 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 adopt the connected mode of parallel connection usually between these LED lamps, the flicker pattern is comparatively single and be difficult to control break, is difficult to attract people's sight.When 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 node, under the situation of so multinode parallel connection, the required output-current rating of power supply is very big; Increased the caloric value of lead greatly, make it be easy to damage and wiring cost higher.Therefore a kind of LED driving method that subtracts stream mode based on high-pressure series of proposing of the present invention 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 owing to current limited to traditional LED lamp and Show Styles are single and be difficult to control break, and a kind of LED driving method that subtracts stream mode based on high-pressure series is provided.
In order to solve the problems of the technologies described above, the invention discloses and a kind ofly subtract the LED driving method of stream mode based on high-pressure series, may further comprise the steps:
Step 1 is with a plurality of receiver node series connection;
Step 2 sends to highest receiver node with required transmission Frame via the coupling buffer circuit by transmitter node and receives;
Step 3, each node intercepting self desired data shows with the LED that controls this node;
Step 4 sends to subordinate's receiver node with remaining data flow and receives.
Among the present invention, preferably, said receiver node comprises voltage stabilizing circuit, processor, and the coupling buffer circuit waits impedance replacement circuit and display circuit;
Said voltage stabilizing circuit mainly is made up of voltage-stabiliser tube and electrochemical capacitor, is used for stablizing the operating voltage of individual node, makes its still steadily effectively work when plural serial stage; Node and the United Nations General Assembly's appearance value electrochemical capacitor are further stablized each node operating voltage, and the data sampling that possibly cause owing to the shake of level when overcoming voltage jump is made mistakes;
Said coupling buffer circuit is used to overcome up and down the two-stage node because can not be through the directly continuous problem of sending or receiving of processor with reference to the different signals that cause of ground voltage.
Said processor is used to receive the data flow that sends over via the coupling buffer circuit, the video data of the required control of this grade of intercepting receiver node LED lamp, and remaining data flow is sent to subordinate's receiver node receive; Show according to data intercept position driving LED lamp;
The said impedance replacement circuit that waits is controlled by processor, and is unique all the time to guarantee each receiving node impedance when the LED lamp carries out the impedance replacement by bright deepening and when sending the buffer circuit saltus step that data cause, current constant, and voltage is stable.
Among the present invention, preferably, said Frame is made up of synchrodata and video data, and synchrodata is used to notify receiver node to make it prepare to receive video data.Arrange the traffic rate between each node, make mistakes, postpone to sample first after the half period for preventing sampling, and every at a distance from the one-period once sampling; Said video data comprises the required control data of all series connection receiver nodes, is used to control its LED lamp and shows.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done specifying further, above-mentioned and/or otherwise advantage of the present invention will become apparent.
Fig. 1 is the connected mode between the two-stage receiver node up and down.
Fig. 2 is the data frame format that transmits between receiver node.
Fig. 3 is the flow chart of whole system.
Embodiment:
The invention discloses and a kind ofly subtract the LED driving method of stream mode, may further comprise the steps based on high-pressure series:
Step 1 is with a plurality of receiver node series connection;
Step 2 sends to highest receiver node with required transmission Frame via the coupling buffer circuit by transmitter node and receives;
Step 3, each node intercepting self desired data shows with the LED that controls this node;
Step 4 sends to subordinate's receiver node with remaining data flow and receives.
Among the present invention, step 1, said receiver node is by voltage stabilizing circuit, the coupling buffer circuit, processor waits impedance replacement circuit and display circuit composition.During series connection be high potential with subordinate's receiver node as the required electronegative potential of higher level's receiver node, by that analogy, form multistage receiver node series connection.
Among the present invention, step 2, said buffer circuit can use optocoupler to realize; Frame is specially from the method that higher level's receiver node sends to subordinate's receiver node; Optocoupler is connected across two-stage receiver up and down; Higher level MCU sends the I/O mouth and connects the optical diode end; The MCU of subordinate receives the I/O mouth and connects the optical transistor end, thereby higher level and subordinate are isolated fully, and is as shown in Figure 1.The higher level can send high and low level through transmission I/O mouth and control subordinate's reception I/O mouth reception high (or low), low (or high) level, thereby reaches the purpose of the non-interfering frame that transmits and receive data of the superior and the subordinate's receiver node.In addition resistance described in Fig. 11, resistance 2 place I/O branch roads respectively optocoupler be conducting to by and LED carry out the impedance replacement during by bright deepening, constant with the impedance that guarantees each node, the voltage at node two ends is stable.It should be noted that optocoupler pipe diode termination pull down resistor in the given concrete implementation of Fig. 1 in addition, triode termination pull-up resistor, institute's higher level is sent " 0 " or " 1 ", and what subordinate received is " 1 " or " 0 ".
More particularly, when the present invention implements, send a string " 0/1 " data flow through MCU control I/O mouth, this data flow comprises 1 of initial separator, the data bit N position of frame, and wherein N is the series connection node number, and is as shown in Figure 2.Here should be pointed out that transmission rate and sample frequency between the receiver nodes at different levels should be consensus.During concrete the reception, when the receiving port of receiver detects the rising edge of higher level's receiver transmission, postpone to sample first after a half period, and every afterwards separated one-period stops up to receiving the N position receiving I/O mouth once sampling.After receiver node is received the total data position, the lowest order of intercepting institute receiving data stream (the agreement lowest order is the required LED control bit of current receiver node), the LED lamp is closed in " 0 " expression, opens resistance 2 place I/O branch roads; The LED lamp is turned in " 1 " expression, closes resistance 2 place I/O branch roads.Then all data bit are moved right 1; The left side highest order mends 0; The N bit data position of newly forming (figure place is constant) is sent to subordinate's receiver node receive, the benefit of doing like this is the handling procedure of all nodes all consistent, and there is not sequencing problem in each node series connection.By that analogy, realize the purpose of control arbitrary node receiver LED lamp flicker.
Among the present invention, preferably, do not use parity check bit and stop bit, in case transfer of data is when makeing mistakes, transmission stops immediately, can't observe a subsequent node LED lamp flicker that makes mistakes, the reason of clearly makeing mistakes.
Whole flow process is as shown in Figure 3 among the present invention, comprises the steps:
Step 1, transmitter node MCU sends the initial signal position to receiver node, and and then sends N bit data position successively, and all data are sent and are spaced apart cycle T;
Half period of delay sampled first after step 2, receiver node received the start bit rising edge, and every separated one-period is to the data bit once sampling;
Step 3 judges whether sampling finishes, and promptly whether adopts and specifies figure place N, if, then carry out step 4, otherwise repeating step 3;
Step 4 by the end of current receiver node intercepting data bit, is controlled its LED lamp behavior;
Step 5 moves to right remaining data bit (left side zero padding, figure place is constant) after 1, sends to subordinate's receiver, repeating step 2;
Step 6, the wait transmitter node is sent Frame once more.
The invention provides a kind of thinking and solution that subtracts the LED driving method of stream mode based on high-pressure series; The method and the approach of concrete this technical scheme of realization are a lot; As Frame being reset, adopts PWM data-driven LED etc., the above only is a preferred implementation of the present invention, should be understood that; For those skilled in the art; Under the prerequisite that does not break away from the principle of the invention, can also make some improvement and retouching, these improvement and retouching also should be regarded as protection scope of the present invention.The all available prior art of each part not clear and definite in the present embodiment realizes.
Claims (4)
1. one kind subtracts the LED driving method of stream mode based on high-pressure series, it is characterized in that, may further comprise the steps:
Step 1 is with a plurality of receiver node series connection;
Step 2 sends to highest receiver node with required transmission Frame via the coupling buffer circuit by transmitter node and receives;
Step 3, each node intercepting self desired data shows with the LED that controls this node;
Step 4 sends to subordinate's receiver node with remaining data flow and receives.
2. according to claim 1ly a kind ofly subtract the LED driving method of stream mode, it is characterized in that described receiver node mainly comprises voltage stabilizing circuit based on high-pressure series, processor, the coupling buffer circuit waits impedance replacement circuit and display circuit;
Said processor receives the Frame that higher level's receiver node sends, and the current receiver node desired data of intercepting shows to control its LED lamp, and remaining traffic is sent to subordinate's receiver;
Said coupling buffer circuit be used to eliminate transmitter and receiver or receiver up and down between the two-stage node during data communication because the influence that epd brings, prevent data transmission fault and node voltage distribute uneven, beat and damage node;
The said impedance replacement circuit that waits carries out impedance replacement by bright deepening and because of sending when data cause the buffer circuit saltus step at the LED lamp respectively, and is unique all the time to guarantee each receiver node impedance, current constant, and voltage is stable;
Said voltage stabilizing circuit is used to stablize the operating voltage of each series connection node.
3. according to claim 2ly a kind ofly subtract the LED driving method of stream mode, it is characterized in that said Frame is made up of synchrodata and video data based on high-pressure series;
Said synchrodata is used to notify subordinate's receiver node to prepare data with clock information;
Said video data, its figure place is by the decision of series connection node number, and each stores the LED control information of corresponding node.
4. a kind of LED driving method that subtracts stream mode based on high-pressure series according to claim 2; It is characterized in that; Said LED lamp is during by bright deepening; Change and cause this node voltage unstable for overcoming this I/O mouth electric current, in the deepening of LED lamp, open I/O branch road with impedance such as this display circuit; In like manner, when the coupling buffer circuit sends " 0/1 " data, also substitute by waiting impedance branch road to carry out impedance, when sending data with assurance, the electric current that flows through each node is unique all the time.
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Cited By (2)
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| CN102970105A (en) * | 2012-11-09 | 2013-03-13 | 深圳市晟碟半导体有限公司 | Transmission method and system of light-emitting diode (LED) chip cascading signals |
| CN109188444A (en) * | 2018-10-10 | 2019-01-11 | 中国船舶重工集团公司七五0试验场 | Seabed underwater sound response formula localization method and its system based on synchronization signal system |
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| CN109188444A (en) * | 2018-10-10 | 2019-01-11 | 中国船舶重工集团公司七五0试验场 | Seabed underwater sound response formula localization method and its system based on synchronization signal system |
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Address after: Qixia District of Nanjing City, Jiangsu province 210034 Street Xianlin Xianlin University City Yuan Road No. 8 Building 28 room 137 Patentee after: JIANGSU GENTURE ELECTRONIC INFORMATION SERVICE CO., LTD. Address before: 210033, No. 8, Yuan Lu, Qixia District, Jiangsu, Nanjing Patentee before: NANJING GENTURE ELECTRONIC INFORMATION CO., LTD. |
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Denomination of invention: LED driving method based on high voltage series current reducing mode Effective date of registration: 20211220 Granted publication date: 20140618 Pledgee: Zheshang Bank Co.,Ltd. Nanjing Branch Pledgor: GENTURE ELECTRONICS Co.,Ltd. Registration number: Y2021320000397 |
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