CN101707828B - Constant-current source driving circuit with open circuit protection and adopting LED - Google Patents

Constant-current source driving circuit with open circuit protection and adopting LED Download PDF

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Publication number
CN101707828B
CN101707828B CN2009101073795A CN200910107379A CN101707828B CN 101707828 B CN101707828 B CN 101707828B CN 2009101073795 A CN2009101073795 A CN 2009101073795A CN 200910107379 A CN200910107379 A CN 200910107379A CN 101707828 B CN101707828 B CN 101707828B
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circuit
current source
constant
triode
source driving
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CN101707828A (en
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周明杰
谭威
孙艳丽
许健
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Oceans King Lighting Science and Technology Co Ltd
Shenzhen Oceans King Lighting Science and Technology Co Ltd
Shenzhen Oceans King Lighting Engineering Co Ltd
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Oceans King Lighting Science and Technology Co Ltd
Shenzhen Oceans King Lighting Engineering Co Ltd
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Abstract

The invention relates to a constant-current source driving circuit with open circuit protection and adopting an LED, comprising a constant-current source for providing constant current for an LED load, a current converter which is connected with the output end of the constant-current source and carries out current conversion, and a rectifier and filter circuit which is connected between the current converter and the LED load. The rectifier and filter circuit comprises a bridge rectifier D1, a filter circuit and an open circuit protection circuit connected between the bridge rectifier D1 and the filter circuit. By adding the open circuit protection between the constant-current source and the LED load, the constant-current source driving circuit of the invention has the function of open circuit protection, simple circuits and lower cost.

Description

Adopt the constant current source driving circuit of LED with open-circuit-protection
Technical field
The present invention relates to a kind of protective circuit, more particularly, relate to the constant current source driving circuit of a kind of LED of employing with open-circuit-protection.
Background technology
As everyone knows, present increasing circuit needs constant current, especially uses LED very widely, and LED needs lower constant current to drive usually.And in the constant-current drive circuit of LED, many circuit adopt constant-current source that constant current is provided.On the one hand, if adopt constant pressure source, often need transformer, constant current chip, single-chip microcomputer etc.; These make and have reduced complicated circuit the reliability of circuit and increased cost, in the constant-current drive circuit of LED, use constant-current source can make that circuit is simple and convenient, cost is low; On the other hand, for some particular application of LED, itself just requires to use constant-current source; Airport for example; Itself has constant-current dimmer as constant-current source with regard to supporting, and when the aid-to-navigation light in the airport adopted LED, constant-current dimmer just can be directly to its power supply.But when using constant-current source, ifs circuit open circuit occurs and will cause circuit high pressure to occur and puncture various components and parts in the circuit.
Summary of the invention
The technical problem that the present invention will solve is; To the defective that lacks open-circuit-protection in the above-mentioned LED constant current source driving circuit of prior art; Provide a kind of and can prevent that when using constant-current source open circuit from damaging circuit, the lower and circuit of cost simply adopts the constant current source driving circuit with open-circuit-protection of LED.
The technical solution adopted for the present invention to solve the technical problems is: the constant current source driving circuit with open-circuit-protection of a kind of LED of employing of structure; It comprises load to LED constant-current source, the power pack that carries out current transformation that links to each other with the output of said constant-current source of constant current is provided and be connected said power pack and the LED load between current rectifying and wave filtering circuit, said current rectifying and wave filtering circuit comprises rectifier bridge heap, filter circuit and is connected the open loop protection circuit between said rectifier bridge heap and the said filter circuit.
In the constant current source driving circuit with open-circuit-protection of the present invention, said open loop protection circuit comprises voltage stabilizing didoe ZD1, be connected in the sample circuit between voltage stabilizing didoe and the ground and be connected in the switching circuit that being used between said rectifier bridge heap D1 and the ground fall short circuit when the open circuit high pressure.
In the constant current source driving circuit with open-circuit-protection of the present invention; Said switching circuit comprises controllable silicon SCR 1; The anode of controllable silicon SCR 1 links to each other with the cathode output end of rectifier bridge heap, and its negative electrode accesses an end of kind circuit ground, and its control utmost point accesses the other end of kind circuit.
In the constant current source driving circuit with open-circuit-protection of the present invention, said switching circuit comprises the first triode Q1, the second triode Q2, and relay K;
Wherein, The base stage of the first triode Q1 links to each other with the anode of voltage stabilizing didoe ZD1, its grounded emitter, and its collector electrode links to each other with the base stage of the second triode Q2; The emitter of the second triode Q2 is through the cathode output end of the input termination rectifier bridge heap of relay; Its collector electrode links to each other with the normally opened contact 2 and the ground of relay K simultaneously, and the normally-closed contact 1 of relay K links to each other with the cathode output end of rectifier bridge heap, and the anode of voltage stabilizing didoe ZD1 is through sample circuit ground connection.
In the constant current source driving circuit with open-circuit-protection of the present invention, the said first triode Q1 is the NPN type, and the said second triode Q2 is a positive-negative-positive.
In the constant current source driving circuit with open-circuit-protection of the present invention, said switching circuit also comprises the pull-up resistor R2 between the base stage of the cathode output end that is connected said rectifier bridge heap and the second triode Q2.
In the constant current source driving circuit with open-circuit-protection of the present invention, the voltage stabilizing value of said voltage stabilizing didoe is a little more than the voltage at said LED load two ends.
In the constant current source driving circuit with open-circuit-protection of the present invention, said sample circuit comprises sample resistance R1 parallel with one another and filter capacitor C1.
In the constant current source driving circuit with open-circuit-protection of the present invention, said constant-current source is a constant-current dimmer.
In the constant current source driving circuit with open-circuit-protection of the present invention, said filter circuit comprises cathode output end that is connected said rectifier bridge heap parallel with one another and electrochemical capacitor C1, the C5 between the ground.
The constant current source driving circuit with open-circuit-protection of embodiment of the present invention; Has following beneficial effect: when open circuit appears in load; Entire circuit voltage raises; Triode in the open loop protection circuit will conducting, and then produces attraction and make the relay quick-make so that load short circuits is fallen, thus overtension and puncture electronic devices and components in the circuit when avoiding opening a way.Simultaneously, circuit of the present invention is simple, cost is low.
Description of drawings
To combine accompanying drawing and embodiment that the present invention is described further below, in the accompanying drawing:
Fig. 1 is the theory diagram of constant current source driving circuit of the present invention;
Fig. 2 is the circuit diagram of a preferred embodiment of constant current source driving circuit of the present invention;
Fig. 3 is the circuit diagram of the another preferred embodiment of constant current source driving circuit of the present invention.
Embodiment
The present invention makes the high pressure of can avoiding opening a way when adopting constant-current source in the constant-current drive circuit damage circuit through between constant-current source and LED load, increasing open loop protection circuit.
Referring to Fig. 1, Fig. 1 is the theory diagram that the present invention has the constant current source driving circuit of open-circuit-protection.Constant current source driving circuit with open-circuit-protection provided by the invention mainly comprises constant-current source 100, power pack 200, current rectifying and wave filtering circuit 300, the LED load 400 that connects successively, and current rectifying and wave filtering circuit 300 comprises rectifier bridge heap D1, filter circuit and is connected the open loop protection circuit 310 between said rectifier bridge heap D1 and the said filter circuit.Wherein, constant-current source 100 is used for constant alternating current to entire circuit being provided, and power pack 200 carries out conversion with the electric current of constant-current source 100 outputs, it is transformed to meet LED load 400 needed constant alternating currents.Because what power pack 200 was exported is constant alternating current, it just can change constant DC into to supply with LED load 400 through current rectifying and wave filtering circuit 300.And the open loop protection circuit 310 of 300 li of current rectifying and wave filtering circuits can be when open circuit appears in LED load 400 with short circuit to protect.
Below in conjunction with Fig. 2 the principle of concrete open-circuit-protection of the present invention is elaborated, Fig. 2 is the circuit diagram of a preferred embodiment of the present invention.
In Fig. 2; Constant-current source 100 is preferably constant-current dimmer; Current rectifying and wave filtering circuit 300 comprises rectifier bridge heap D1, filter circuit and is connected the open loop protection circuit 310 between said rectifier bridge heap D1 and the said filter circuit; Open loop protection circuit 310 comprises voltage stabilizing didoe ZD1, by sample resistance R1 and the filter capacitor C1 sample circuit of forming parallel with one another and be connected in the switching circuit that being used between rectifier bridge heap D1 and the ground fall short circuit when the open circuit high pressure, switching circuit comprises the first triode Q1, the second triode Q2, relay K, and pull-up resistor R2.Wherein, sample resistance R1 can be single resistance, also can or compose in parallel for a plurality of resistance series connection, and preferably, the first triode Q1 is the NPN type, and the second triode Q2 is a positive-negative-positive, and relay is an electromagnetic type relay, and what adopt among Fig. 2 is electromagnetic type relay.
Referring to Fig. 2, the base stage of the first triode Q1 links to each other with the anode of voltage stabilizing didoe ZD1 and an end of sample circuit simultaneously, its grounded emitter, and its collector electrode links to each other with the base stage of the second triode Q2 and the end of pull-up resistor R2 simultaneously; The collector electrode of the second triode Q2 links to each other with the normally opened contact (2 pin) and the ground of relay K simultaneously, and its emitter connects the cathode output end that rectifier bridge is piled through the input (being input 3,4) that is made up of coil of relay K; The normally-closed contact of relay K (1 pin) links to each other with the cathode output end of rectifier bridge heap; The anode of one termination voltage stabilizing didoe of sample circuit, its other end ground connection, the negative electrode of a termination voltage stabilizing didoe of pull-up resistor, the base stage of its another termination second triode Q2.Current rectifying and wave filtering circuit 300 comprises electrochemical capacitor C1, C2 parallel with one another, and both parallel connection back cross-over connections are between the cathode output end and ground of rectifier bridge heap, and it is used for the ripple of the direct current after the filtering rectification.
The cathode output end of the one termination rectifier bridge heap of LED load 400, its other end ground connection.Because the normally-closed contact of relay connects the cathode output end of rectifier bridge heap, its normally opened contact ground connection, the adhesive K switch 1 direct cross-over connection that makes relay like this is between the cathode output end and ground of rectifier bridge heap; When LED load 400 open circuit occurs owing to a variety of causes; Entire circuit voltage will raise, when being higher than the voltage stabilizing value of voltage stabilizing didoe ZD1, and then voltage stabilizing didoe ZD1 conducting; Thereby make sample circuit get big voltage; Then the base stage of the first triode Q1 of NPN type can obtain to be higher than voltage and the conducting of 0.7V from the sample circuit, and simultaneously, the conducting of the first triode Q1 makes the second also conducting of triode Q2 of positive-negative-positive; And then the coil on the input of relay K obtains electric current and produces an electromagnetic attraction adhesive K switch 1 is closed; Form the short circuit loop between adhesive K switch like this 1 and the ground, the voltage of entire circuit is dragged down, just can avoid puncturing electronic devices and components because of overtension; Thereby make whole constant current source driving circuit needed constant current is provided both can for the LED load, also have the open-circuit-protection advantage.
The present invention can also adopt following manner to realize that referring to Fig. 3, it is the circuit diagram of another embodiment of the present invention.What they were different with aforesaid way is; Its switching circuit adopts controllable silicon SCR 1, and the anode of controllable silicon SCR 1 links to each other its minus earth with the cathode output end of rectifier bridge heap and the negative electrode of voltage stabilizing didoe ZD1 simultaneously; Its control utmost point accesses an end of kind circuit, the other end ground connection of sample circuit.When LED load open circuit and entire circuit voltage raise and when being higher than the voltage stabilizing value of voltage stabilizing didoe ZD1; Voltage stabilizing didoe ZD1 conducting; Thereby make sample circuit get big voltage, and then controllable silicon SCR 1 conducting and the subsequent conditioning circuit short circuit is fallen, voltage in the circuit is assigned to the earth with protective circuit.Switching circuit can also adopt with above-mentioned similar mode and realize among the present invention.
The voltage stabilizing value of voltage stabilizing didoe ZD1 needs the voltage a little more than LED load 400 two ends; Can avoid following situation like this: it is higher that voltage appears in LED load 400; But the high-voltage value that this voltage causes when not having up to open circuit; But it causes the too early conducting of voltage stabilizing didoe ZD1 and then the short circuit that entire circuit there is no need has been fallen, and has influenced the operate as normal of circuit.
In sum; Constant current source driving circuit provided by the invention can effectively carry out open-circuit-protection when to LED constant current being provided, simultaneously, open loop protection circuit has wherein been avoided the use chip; It only uses common electronic devices and components, and circuit structure is simple, stability is strong and cost is lower.
The above is merely the preferred embodiments of the present invention; Be not so limit claim of the present invention; Every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.

Claims (7)

1. constant current source driving circuit that adopts LED with open-circuit-protection; It is characterized in that; Comprise load to LED constant-current source, the power pack that carries out current transformation that links to each other with the output of said constant-current source of constant current is provided and be connected said power pack and the LED load between current rectifying and wave filtering circuit, formation short circuit loop drags down the voltage in the entire circuit open loop protection circuit of protecting when said current rectifying and wave filtering circuit comprises rectifier bridge heap D1, filter circuit and is connected being used for the LED load and open circuit occurs between said rectifier bridge heap D1 and the said filter circuit and between the ground;
Said open loop protection circuit comprises that negative electrode connects the voltage stabilizing didoe ZD1 of said rectifier bridge heap D1 output, is connected in the sample circuit between voltage stabilizing didoe and the ground and is connected in the switching circuit that being used between said rectifier bridge heap D1 and the ground fall short circuit when the open circuit high pressure;
Said switching circuit comprises the first triode Q1, the second triode Q2, reaches relay K;
Wherein, The base stage of the first triode Q1 links to each other with the anode of voltage stabilizing didoe ZD1, its grounded emitter, and its collector electrode links to each other with the base stage of the second triode Q2; The emitter of the second triode Q2 is through the cathode output end of the input termination rectifier bridge heap of relay; Its collector electrode links to each other with the normally opened contact (2) and the ground of relay K simultaneously, and the normally-closed contact of relay K (1) links to each other with the cathode output end of rectifier bridge heap, and the anode of voltage stabilizing didoe ZD1 is through sample circuit ground connection.
2. constant current source driving circuit according to claim 1 is characterized in that, the said first triode Q1 is the NPN type, and the said second triode Q2 is a positive-negative-positive.
3. constant current source driving circuit according to claim 1 is characterized in that, said switching circuit also comprises the pull-up resistor R2 between the base stage of the cathode output end that is connected said rectifier bridge heap and the second triode Q2.
4. according to each described constant current source driving circuit in the claim 1 to 3, it is characterized in that the voltage stabilizing value of said voltage stabilizing didoe is higher than the voltage at said LED load two ends.
5. according to each described constant current source driving circuit in the claim 1 to 3, it is characterized in that said sample circuit comprises sample resistance R1 parallel with one another and filter capacitor C1.
6. constant current source driving circuit according to claim 1 is characterized in that, said constant-current source is a constant-current dimmer.
7. constant current source driving circuit according to claim 1 is characterized in that, said filter circuit comprises cathode output end that is connected said rectifier bridge heap parallel with one another and electrochemical capacitor C1, the C5 between the ground.
CN2009101073795A 2009-05-20 2009-05-20 Constant-current source driving circuit with open circuit protection and adopting LED Active CN101707828B (en)

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CN101888730B (en) * 2010-06-30 2013-12-11 海洋王照明科技股份有限公司 Alternating current constant current source LED driving circuit
CN102316638B (en) * 2010-07-06 2014-04-16 松下电器产业株式会社 LED lighting device and illumination fixture using the same
JP5525393B2 (en) * 2010-09-06 2014-06-18 パナソニック株式会社 LED lighting device and lighting apparatus using the same
CN101994963B (en) * 2010-09-30 2015-10-28 海洋王照明科技股份有限公司 A kind of runway threshold wing bank light and navaid illuminator
CN102003660B (en) * 2010-09-30 2013-11-13 海洋王照明科技股份有限公司 Approach side lamp and navigation illuminating system
CN102892221B (en) * 2011-07-20 2015-04-29 海洋王照明科技股份有限公司 LED (light-emitted diode) lamp and open-circuit protective circuit thereof
CN103857157B (en) * 2012-11-30 2016-04-13 深圳市海洋王照明工程有限公司 Light fixture open-circuit-protection system
JP6155703B2 (en) 2013-03-04 2017-07-05 セイコーエプソン株式会社 Light source device and projector
CN104411070A (en) * 2014-12-10 2015-03-11 上海康耐司信号设备有限公司 Protection circuit
CN105782778A (en) * 2014-12-25 2016-07-20 唐先林 Energy-saving light source with open circuit protection for silicon controlled driver
US11137119B2 (en) * 2016-05-12 2021-10-05 Signify Holding B.V. Tubular device for fitting to a tubular light fitting
CN108513389B (en) * 2017-02-24 2021-06-04 中国民用航空总局第二研究所 Multi-mode navigation light dimmer and control method

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CN2715458Y (en) * 2004-06-17 2005-08-03 徐承深 Semiconductor illuminating constant current supply
CN101247695A (en) * 2008-03-03 2008-08-20 大连交通大学 Filament open-circuit protector for constant-current light modulation system of air station navigation light
CN101281394A (en) * 2007-04-04 2008-10-08 鸿富锦精密工业(深圳)有限公司 Power socket

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5818675A (en) * 1996-11-04 1998-10-06 Lu; Chao-Cheng Protection device for electronic circuits
CN2715458Y (en) * 2004-06-17 2005-08-03 徐承深 Semiconductor illuminating constant current supply
CN101281394A (en) * 2007-04-04 2008-10-08 鸿富锦精密工业(深圳)有限公司 Power socket
CN101247695A (en) * 2008-03-03 2008-08-20 大连交通大学 Filament open-circuit protector for constant-current light modulation system of air station navigation light

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