CN102905429B - Pulse-driven power circuit of LEDs (light emitting diodes) with equal duty ratio - Google Patents
Pulse-driven power circuit of LEDs (light emitting diodes) with equal duty ratio Download PDFInfo
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- CN102905429B CN102905429B CN201210377848.7A CN201210377848A CN102905429B CN 102905429 B CN102905429 B CN 102905429B CN 201210377848 A CN201210377848 A CN 201210377848A CN 102905429 B CN102905429 B CN 102905429B
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Abstract
The invention discloses a pulse-driven power circuit of LEDs (light emitting diodes) with equal duty ratio. The pulse-driven power circuit comprises a bridge rectifier, a current limiting device, a control voltage order control device, and an LED lamp bank; an alternating current input end of the bridge rectifier is connected with the control voltage order control device; the control voltage order control device is connected with a control switch of the LED lamp bank; the anode of the bridge rectifier is connected with the current limiting device and the LED lamp bank, and the cathode of the bridge rectifier is grounded. The invention provides the pulse-driven power circuit of the LEDs (light emitting diodes) with equal duty ratio, so that the utilization rate of each LED is maximized, and the product cost is reduced.
Description
[technical field]
The invention belongs to field of lighting devices, be specifically related to a kind of equal duty ratio LED pulsation driving power circuit.
[background technology]
As shown in Figure 1, be the AC driven power circuit of prior art.
The sequence of light of LED along with the rising of commutating voltage luminous from top to bottom, when commutating voltage declines, extinguishing order is from top to bottom,
This causes nethermost LED fluorescent lifetime much larger than the LED of topmost, to such an extent as to the setting of electric current is very difficult.
Ensure the safe current of bottom LED, uppermost LED due to ON time very short, need very high electric current, the two cannot be taken into account; Close with one group, the top in order to take into account the initial conducting voltage that just must improve bottom a group, but this can reduce the duty ratio of LED conducting further, affects light efficiency.For obtaining identical brightness, because light efficiency is low, necessary multiplex LED, causes cost increase.Due to commutating voltage lower time, LED group is completely not luminous, easily occurs scintillation.
[summary of the invention]
Technical problem to be solved by this invention is to provide a kind of equal duty ratio LED pulsation driving power circuit, the utilance of LED is maximized, reduces product cost, and greatly alleviate scintillation.
The present invention solves the problems of the technologies described above by the following technical solutions:
Equal duty ratio LED is pulsed driving power circuit, comprises a bridge rectifier, a current-limiting apparatus, a control voltage order controller, a LED group; The input of described bridge rectifier connects described control voltage order controller, and described bridge rectifier output head anode connects described current-limiting apparatus and described LED group, described bridge rectifier minus earth.
Further, described LED group comprise several string and LED and the control switch in parallel with LED.
Further, current-limiting apparatus is the device of Limited Current, comprises resistance, current-limiting circuit.
Further, described current-limiting apparatus and LED group are series relationship.
Further, described control voltage order controller comprises rectification filter circuit, a pulse voltage odd even decision circuitry, a current-limiting apparatus voltage drop detection circuit, a logic judging circuit, a switch control voltage output circuit; Described rectification circuit connects described bridge rectifier, described pulse voltage odd even decision circuitry respectively; Described pulse voltage odd even decision circuitry connects described logic judging circuit; Described logic judging circuit connects described switch control voltage output circuit; Described current-limiting apparatus voltage drop detection circuit connects described logic judging circuit; Described switch control voltage output circuit is connected to described LED group.
Further, described control voltage order controller comprises a rectification filtering power circuit, a pulse voltage odd even decision circuitry, an input voltage detection circuit, a logic judging circuit, a switch control voltage output circuit; Described rectification filtering power circuit connects described bridge rectifier, described pulse voltage odd even decision circuitry, described input voltage detection circuit respectively; Described pulse voltage odd even decision circuitry connects described logic judging circuit; Described logic judging circuit connects described switch control voltage output circuit; Described input voltage detection circuit connects described logic judging circuit; Described switch control voltage output circuit is connected to described LED group.
Further, described control voltage order controller comprises that one first half-wave rectifying circuit, one second rushes ripple rectification circuit, a half-wave voltage detects forward sequence output circuit, a forward sequence controls output circuit, a reverse sequence controls output circuit; Described first half-wave rectifying circuit, second is rushed ripple rectification circuit and is all connected to described bridge rectifier; Described first half-wave rectifying circuit connects described half-wave voltage and detects forward sequence output circuit, and described half-wave voltage detects forward sequence output circuit and connects described forward sequence control output circuit, and described forward sequence controls output circuit and connects described LED group; Described second half-wave rectifying circuit connects described half-wave voltage and detects reverse sequence output circuit, and described half-wave voltage detects reverse sequence output circuit and connects described reverse sequence control output circuit, and described reverse sequence controls output circuit and connects described LED group.
Described control voltage order controller is the control device exporting control voltage in order, and output order forward, oppositely can control; The output of described control voltage order controller is corresponding with the control switch of LED group to be connected.
The invention has the advantages that: the luminous cumulative time of all LED is the same, so just can set a rational current value and send enough light by LED, the utilance of LED is maximized, reduce product cost.The luminous efficiency of LED is high and consistent, so the quantity of LED can be minimized, cost reduces.Control owing to can realize the complete period, voltage still has LED in luminescence in close to 0, greatly alleviates scintillation.
[accompanying drawing explanation]
The invention will be further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is prior art LED alternating-current driving power circuit figure.
Fig. 2 is first embodiment of the invention schematic diagram.
Fig. 3 is second embodiment of the invention schematic diagram.
Fig. 4 is third embodiment of the invention schematic diagram.
[embodiment]
First embodiment:
As shown in Figure 2, equal duty ratio LED is pulsed driving power circuit, comprises a bridge rectifier, a current-limiting apparatus, a control voltage order controller, a LED group; The two ends of described bridge rectifier connect described control voltage order controller, and described bridge rectifier positive pole connects described current-limiting apparatus and described LED group, described bridge rectifier minus earth.Described control voltage order controller comprises a rectification filtering power circuit, a pulse voltage odd even decision circuitry, a current-limiting apparatus voltage drop detection circuit, a logic judging circuit, a switch control voltage output circuit; Described rectification filtering power circuit connects described bridge rectifier, described pulse voltage odd even decision circuitry respectively; Described pulse voltage odd even decision circuitry connects described logic judging circuit; Described logic judging circuit connects described switch control voltage output circuit; Described current-limiting apparatus voltage drop detection circuit connects described logic judging circuit; Described switch control voltage output circuit is connected to described LED group.
After alternating current input, obtain DC power supply and pulse voltage by rectification filtering power circuit; Current limliting voltage drop detection circuit detects the magnitude of voltage of input, and carries out current limliting to the electric current of input; Pulse voltage after rectification judges according to odd number cycle and even numbers cycle by pulse voltage odd even decision circuitry; The odd number cycle that logic judging circuit foundation pulse voltage odd even decision circuitry judges and even numbers cycle, respectively two differences are inputted and corresponding input voltage to switch control voltage output circuit, LED group according to two differences and corresponding input voltage with two contrary sequential illumination LED, realize between a complete ac period, the accumulative fluorescent lifetime of each LED is identical, the utilance of LED is maximized, reduces product cost.
Second embodiment:
As shown in Figure 3, equal duty ratio LED is pulsed driving power circuit, comprises a bridge rectifier, a current-limiting apparatus, a control voltage order controller, a LED group; The two ends of described bridge rectifier connect described control voltage order controller, and described bridge rectifier positive pole connects described current-limiting apparatus and described LED group, described bridge rectifier minus earth.Described control voltage order controller comprises a rectification filtering power circuit, a pulse voltage odd even decision circuitry, an input voltage detection circuit, a logic judging circuit, a switch control voltage output circuit; Described rectification filtering power circuit connects described bridge rectifier, described pulse voltage odd even decision circuitry, described input voltage detection circuit respectively; Described pulse voltage odd even decision circuitry connects described logic judging circuit; Described logic judging circuit connects described switch control voltage output circuit; Described input voltage detection circuit connects described logic judging circuit; Described switch control voltage output circuit is connected to described LED group.
After alternating current input, obtain DC power supply and pulse voltage by rectification filtering power circuit; Voltage detecting circuit detects the input voltage value after rectification; Pulse voltage after rectification judges according to odd number cycle and even numbers cycle by pulse voltage odd even decision circuitry; The odd number cycle that logic judging circuit foundation pulse voltage odd even decision circuitry judges and even numbers cycle, respectively two differences are inputted and corresponding input voltage to switch control voltage output circuit, LED group according to two differences and corresponding input voltage with two contrary sequential illumination LED, realize between a complete ac period, the fluorescent lifetime of each LED is identical, the utilance of LED is maximized, reduces product cost.
3rd embodiment:
As shown in Figure 4, equal duty ratio LED is pulsed driving power circuit, comprises a bridge rectifier, a current-limiting apparatus, a control voltage order controller, a LED group; The two ends of described bridge rectifier connect described control voltage order controller, and described bridge rectifier positive pole connects described current-limiting apparatus and described LED group, described bridge rectifier minus earth.Described control voltage order controller comprises one first half-wave rectifying circuit, one second half-wave rectifying circuit, a half-wave voltage detects forward sequence output circuit, a half-wave voltage detects reverse sequence output circuit, a forward sequence controls output circuit, a reverse sequence controls output circuit; Described first half-wave rectifying circuit, the second half-wave rectifying circuit are all connected to described bridge rectifier input; Described first half-wave rectifying circuit connects described half-wave voltage and detects forward sequence output circuit, described half-wave voltage detects forward sequence output circuit and connects described forward sequence control output circuit, described forward sequence controls output circuit and connects described LED group, realizes LED group forward and lights order; Described second half-wave rectifying circuit connects described half-wave voltage and detects reverse sequence output circuit, described half-wave voltage detects reverse sequence output circuit and connects described reverse sequence control output circuit, described reverse sequence controls output circuit and connects described LED group, realizes LED group forward and lights order.
After alternating current input, carry out halfwave rectifier by two half-wave rectifying circuits (namely the first half-wave rectifying circuit and second rushes ripple rectification circuit), obtain two corresponding input voltages (i.e. positive half cycle and negative half period) respectively; Control output circuit and reverse sequence by forward sequence and control output circuit respectively by two differences and corresponding input voltage is input in LED group; The positive-negative half-cycle of two correspondences exchanged controls output circuit and reverse sequence by forward sequence and controls output circuit with two contrary sequential illumination LED, realize between a complete ac period, the fluorescent lifetime of each LED is identical, the utilance of LED is maximized, reduces product cost.
In above three embodiments, described control voltage order controller is the control device exporting control voltage in order, and output order forward, oppositely can control; The output of described control voltage order controller is corresponding with the control switch of LED group to be connected.Described LED group comprise several string and LED and the control switch in parallel with LED.Current-limiting apparatus is the device of Limited Current, comprises resistance, current-limiting circuit.Described current-limiting apparatus and LED group are series relationship
Above-described embodiment and graphic and non-limiting product form of the present invention and style, any person of an ordinary skill in the technical field, to its suitable change done or modification, all should be considered as not departing from patent category of the present invention.
Claims (6)
1. equal duty ratio LED pulsation driving power circuit, is characterized in that: comprise a bridge rectifier, a current-limiting apparatus, a control voltage order controller, a LED group;
The input of described bridge rectifier connects described control voltage order controller, and described bridge rectifier output head anode connects described current-limiting apparatus and described LED group, described bridge rectifier negative pole of output end ground connection;
Described control voltage order controller, comprises a current rectifying and wave filtering circuit, a pulse voltage odd even decision circuitry, a current-limiting apparatus voltage drop detection circuit, a logic judging circuit, a switch control voltage output circuit; Described current rectifying and wave filtering circuit connects described bridge rectifier, described pulse voltage odd even decision circuitry respectively; Described pulse voltage odd even decision circuitry connects described logic judging circuit; Described logic judging circuit connects described switch control voltage output circuit; Described current-limiting apparatus voltage drop detection circuit connects described logic judging circuit; Described switch control voltage output circuit is connected to described LED group.
2. equal duty ratio LED as claimed in claim 1 is pulsed driving power circuit, it is characterized in that: described control voltage order controller is the control device exporting control voltage in order, and output order forward, oppositely can control; The output of described control voltage order controller is corresponding with the control switch of LED group to be connected.
3. equal duty ratio LED pulsation driving power circuit, is characterized in that: comprise a bridge rectifier, a current-limiting apparatus, a control voltage order controller, a LED group;
The input of described bridge rectifier connects described control voltage order controller, and described bridge rectifier output head anode connects described current-limiting apparatus and described LED group, described bridge rectifier negative pole of output end ground connection;
Described control voltage order controller, comprises a rectification filtering power circuit, a pulse voltage odd even decision circuitry, an input voltage detection circuit, a logic judging circuit, a switch control voltage output circuit; Described rectification filtering power circuit connects described bridge rectifier, described pulse voltage odd even decision circuitry, described input voltage detection circuit respectively; Described pulse voltage odd even decision circuitry connects described logic judging circuit; Described logic judging circuit connects described switch control voltage output circuit; Described input voltage detection circuit connects described logic judging circuit; Described switch control voltage output circuit is connected to described LED group.
4. equal duty ratio LED as claimed in claim 3 is pulsed driving power circuit, it is characterized in that: described control voltage order controller is the control device exporting control voltage in order, and output order forward, oppositely can control; The output of described control voltage order controller is corresponding with the control switch of LED group to be connected.
5. equal duty ratio LED pulsation driving power circuit, is characterized in that: comprise a bridge rectifier, a current-limiting apparatus, a control voltage order controller, a LED group;
The input of described bridge rectifier connects described control voltage order controller, and described bridge rectifier output head anode connects described current-limiting apparatus and described LED group, described bridge rectifier negative pole of output end ground connection;
Described control voltage order controller, comprises one first half-wave rectifying circuit, one second half-wave rectifying circuit, a half-wave voltage detects forward sequence output circuit, a forward sequence controls output circuit, a reverse sequence controls output circuit; Described first half-wave rectifying circuit, the second half-wave rectifying circuit are all connected to described bridge rectifier; Described first half-wave rectifying circuit connects described half-wave voltage and detects forward sequence output circuit, and described half-wave voltage detects forward sequence output circuit and connects described forward sequence control output circuit, and described forward sequence controls output circuit and connects described LED group; Described second half-wave rectifying circuit connects described half-wave voltage and detects reverse sequence output circuit, and described half-wave voltage detects reverse sequence output circuit and connects described reverse sequence control output circuit, and described reverse sequence controls output circuit and connects described LED group.
6. equal duty ratio LED as claimed in claim 5 is pulsed driving power circuit, it is characterized in that: described control voltage order controller is the control device exporting control voltage in order, and output order forward, oppositely can control; The output of described control voltage order controller is corresponding with the control switch of LED group to be connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210377848.7A CN102905429B (en) | 2012-09-29 | 2012-09-29 | Pulse-driven power circuit of LEDs (light emitting diodes) with equal duty ratio |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210377848.7A CN102905429B (en) | 2012-09-29 | 2012-09-29 | Pulse-driven power circuit of LEDs (light emitting diodes) with equal duty ratio |
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| CN102905429A CN102905429A (en) | 2013-01-30 |
| CN102905429B true CN102905429B (en) | 2015-04-15 |
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| CN105142282B (en) * | 2015-09-08 | 2018-07-10 | 镇江苏能光电有限公司 | LED segmented alternate conduction circuits and its driving method based on MCU |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201636622U (en) * | 2010-04-06 | 2010-11-17 | 吴全华 | Digital controllable light alternating-current direct drive integrated LED illuminating lamp |
| CN202841636U (en) * | 2012-09-29 | 2013-03-27 | 福州凡普科技有限公司 | Equal duty cycle light-emitting diode (LED) pulsation driving power circuit |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201636622U (en) * | 2010-04-06 | 2010-11-17 | 吴全华 | Digital controllable light alternating-current direct drive integrated LED illuminating lamp |
| CN202841636U (en) * | 2012-09-29 | 2013-03-27 | 福州凡普科技有限公司 | Equal duty cycle light-emitting diode (LED) pulsation driving power circuit |
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Granted publication date: 20150415 Termination date: 20160929 |