CN203984710U - A kind of open loop protection circuit and there is the illuminator of this open loop protection circuit - Google Patents
A kind of open loop protection circuit and there is the illuminator of this open loop protection circuit Download PDFInfo
- Publication number
- CN203984710U CN203984710U CN201420332905.4U CN201420332905U CN203984710U CN 203984710 U CN203984710 U CN 203984710U CN 201420332905 U CN201420332905 U CN 201420332905U CN 203984710 U CN203984710 U CN 203984710U
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- China
- Prior art keywords
- open loop
- protection circuit
- loop protection
- circuit
- illuminator
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Abstract
The utility model discloses a kind of open loop protection circuit for illuminator, it is in parallel with a light-emitting component.This open loop protection circuit has input and output.Described open loop protection circuit comprises a thyristor, and the described thyristor control utmost point and positive pole are connected to described input, and described thyristor negative pole is connected to described output, wherein, is connected with a RC circuit between the described thyristor control utmost point and negative pole.The invention also discloses a kind of circuit illuminator with above-mentioned open loop protection circuit.
Description
Technical field
The utility model relates to a kind of open loop protection circuit, and a kind of illuminator with this open loop protection circuit.
Background technology
Under the background that Present Global energy starved worry raises once again, energy savings is the important problem that we shall face future, at lighting field, LED be called as the 4th generation lighting source or green light source, there is the features such as energy-saving and environmental protection, the life-span is long, volume is little, can be widely used in the fields such as various instructions, demonstration, decoration, backlight, general lighting and urban landscape.LED, as a kind of novel green light source product, must be the trend of future development, and 21st century is by the novel illumination light source epoch that enter taking LED as representative.Because single led power is low, in order to make the increase of output power of LED light fixture, need to select multiple LED lamp combinations, to meet the high-power object in high-power illumination place, wherein most typical suitable application area is exactly field of street lamp lighting.The mode that the series connection of LED lamp combination combines is more common connected mode, and series circuit is generally selected constant-current source, once multiple LED lamps of series connection remove or damage one or many, other residues LED lamp also cannot be worked simultaneously.
Utility model content
In order to overcome above-mentioned technological deficiency, the purpose of this utility model is to provide a kind of open loop protection circuit that can protect it in the time that light-emitting component is opened a way, and utilizes the characteristic of RC circuit to ensure open loop protection circuit fail safe in use.
To achieve these goals; the utility model first aspect discloses a kind of open loop protection circuit for illuminator; it is in parallel with a light-emitting component; and there is input and output; described open loop protection circuit comprises a thyristor, and the described thyristor control utmost point and positive pole are connected to described input, and described thyristor negative pole is connected to described output; wherein, between the described thyristor control utmost point and negative pole, be connected with a RC circuit.
In open loop protection circuit described in the utility model, described RC circuit comprises the resistance R 1 and the capacitor C that are connected in parallel.
In open loop protection circuit described in the utility model, between the described thyristor control utmost point and described input, be connected with a resistance R 2.
In open loop protection circuit described in the utility model, between described thyristor positive pole and described input, be connected with a resistance R 3.
The utility model second aspect discloses a kind of circuit illuminator; comprise a power control; at least two light-emitting components that are mutually connected in series; and the open loop protection circuit with RC circuit in parallel with light-emitting component described in each, described at least two light-emitting components and described open loop protection circuit are connected between described power control both positive and negative polarity.
In circuit illuminator described in the utility model, described power control is constant-current type control device.
In circuit illuminator described in the utility model; input and the output of described at least two open loop protection circuits are end to end, and the positive and negative electrode of described power control is connected to the input of open loop protection circuit described in one of them and with it described in adjacent another between output of open loop protection circuit.
The open loop protection circuit of the RC of having circuit described in the utility model can be effectively delay protection characteristic protection series circuit by RC circuit in the situation that of part luminescent device breakdown, still can normally work, and can be by connecting RC circuit protection thyristor and whole lighting circuit being carried out to filtering, the function such as anti-interference.
Brief description of the drawings
Fig. 1 is the circuit diagram of the disclosed open loop protection circuit of the utility model;
Fig. 2 is the working state schematic representation of the disclosed open loop protection circuit of the utility model in whole series circuit illuminator.
Embodiment
For technological means, creation characteristic that the utility model is realized, reach object and effect is easy to understand, below in conjunction with specific embodiments and the drawings, further set forth the utility model.
As shown in Figure 1 be the circuit diagram of the disclosed open loop protection circuit 1 of the utility model, it is in parallel with a light-emitting component 2.This open loop protection circuit 1 has input Vin and output end vo ut, wherein also has a thyristor SCR.This thyristor SCR has three pins, is respectively to control utmost point G, anodal SCR+ and negative pole SCR-.Wherein the control utmost point G of thyristor SCR and anodal SCR+ are connected to input Vin, and negative pole is connected to output end vo ut.In a preferred embodiment of the present utility model, between the control utmost point G of thyristor SCR and negative pole SCR-, be connected with a RC circuit.In actual use; the light-emitting component 2 moment open circuit that open loop protection circuit 1 is protected; can make its two ends produce overshoot voltage; overshoot voltage can puncture the thyristor SCR that is connected in parallel on its two ends; a RC circuit in parallel just can effectively utilize the characteristic of RC circuit to form a buffering to the voltage at thyristor SCR two ends, has played the effect of protection thyristor SCR.
In a preferred embodiment of open loop protection circuit 1 of the present utility model, select a kind of RC parallel circuits, comprise the resistance R 1 and the capacitor C that are connected in parallel.The advantage of this programme is that the extra device adding is few, only need to add a resistance R 1 and capacitor C can realize filtering, anti-interference, prevent that overshoot voltage from puncturing these three effects of thyristor SCR, can effectively improve electrical efficiency, conserve space, reduce costs.
As shown in Figure 1 and Figure 2, control between utmost point G and input Vin and be connected with a resistance R 2 at thyristor SCR, control the voltage U of utmost point G for controlling thyristor SCR
g.There is a trigger voltage U in thyristor SCR itself
gt, control the conducting of thyristor SCR or close.In the time that series circuit is normally worked, the voltage U at resistance R 1, R2 series circuit two ends
1voltage U with light-emitting component 2 two ends
lequate, at this moment can control the voltage U of thyristor SCR control utmost point G by the size of regulating resistance R1, R2
g, make U
g<U
gt; In the time there is open circuit phenomenon in series circuit, can produce transient overshoot voltage at resistance R 1, R2 two ends, make its both end voltage U
2be greater than the voltage U at light-emitting component 2 two ends
l, at this moment thyristor SCR controls the voltage U of utmost point G
g>U
gt, therefore conducting of thyristor SCR, electric current can flow in series circuit thereafter through thyristor SCR, has played circuit cut-off protection.
As shown in Figure 1, between the anodal SCR+ of thyristor SCR and input Vin, be connected with a resistance R 3.By anodal thyristor SCR SCR+ is connected with protective resistance R3, can effectively protect thyristor SCR not to be damaged.
As shown in Figure 2 be the fundamental diagram of whole series circuit illuminator.As shown in the figure; the utility model discloses a kind of illuminator; it comprises a power control 3; at least two light-emitting components that are mutually connected in series 2; and the above-mentioned disclosed open loop protection circuit 1 in parallel with each light-emitting component 2, at least two light-emitting components 2 and open loop protection circuit 1 are connected between these power control 3 both positive and negative polarities.Above-mentioned disclosed open loop protection circuit 1 can be applied in various series circuit illuminators; by establishing thyristor SCR in the inner and the duplicate protection of RC circuit; ensure the steady illumination of whole series circuit illuminator, and extend the useful life of whole series circuit illuminator.
In the disclosed illuminator of the utility model, the LED lamp that light-emitting component 2 normally has wide range of applications, because LED lamp is semiconductor device, therefore need to prevent from occurring in whole circuit the situation of momentary load or instantaneous open circuit especially.
In a preferred embodiment of the present utility model, power control 3 is a kind of constant-current type control device.By constant-current type control device; control the input current substantially constant of whole circuit illuminator; be not subject to the impact of change in voltage; therefore in the time there is the situation of instantaneous open circuit; the electric current of inputting whole circuit illuminator does not change; thereby make the illumination of other normal light-emitting components 2 of working unaffected, especially, in the application of LED lamp, constant-current type control device is very considerable for the protective effect of whole LED illuminator.
In prior art, in the time having the light-emitting component 2 ' of a damage, whole circuit for series circuit open circuit.At LED lighting field, the luminous original paper 2 ' of this damage is exactly the LED lamp 2 ' of a damage, and in the situation that there is no open loop protection circuit 1, other LED lamps 2 also can normally not worked, thereby reality is used and produced puzzlement.In each LED lamp 2 two ends parallel connection after the disclosed open loop protection circuit 1 of the utility model, the electric current located of LED lamp 2 ' that damages then flow into and be parallel to the open loop protection circuit 1 at its two ends of flowing through, thus can not affect the illumination of other LED lamps 2.
In a preferred embodiment of the present utility model; input Vin and the output end vo ut of at least two open loop protection circuits 1 are end to end, and the positive and negative electrode of power control 3 is connected to the input Vin of one of them open loop protection circuit 1 and with it between the output end vo ut of another adjacent open loop protection circuit 1.In the time that multiple open loop protection circuits 1 are worked simultaneously and protect light-emitting component 2 in same circuit illuminator, the input Vin of first open loop protection circuit 1 and the anodal V of power control 3 that are directly connected with power control 3
+connect the output end vo ut of last open loop protection circuit 1 and the negative pole V of power control 3 that are directly connected with power control 3 simultaneously
-connect.The output end vo ut of middle each open loop protection circuit 1 is all connecting the input Vin of next open loop protection circuit 1; the conducting direction of thyristor SCR in each open loop protection circuit 1 is consistent like this; conform to the purpose of this utility model, can reach well the object of the whole circuit illuminator of protection.
Should be noted that, embodiment of the present utility model has preferably implementation, and not the utility model is done to any type of restriction, any person skilled in art of being familiar with may utilize the technology contents of above-mentioned announcement to change or be modified to the effective embodiment being equal to, in every case do not depart from the content of technical solutions of the utility model, any amendment or equivalent variations and the modification above embodiment done according to technical spirit of the present utility model, all still belong in the scope of technical solutions of the utility model.
Claims (7)
1. for an open loop protection circuit for illuminator, it is in parallel with a light-emitting component, and has input and output,
Described open loop protection circuit comprises a thyristor,
The described thyristor control utmost point and positive pole are connected to described input,
Described thyristor negative pole is connected to described output,
It is characterized in that:
Between the described thyristor control utmost point and negative pole, be connected with a RC circuit.
2. open loop protection circuit as claimed in claim 1, is characterized in that: described RC circuit comprises the resistance R 1 and the capacitor C that are connected in parallel.
3. open loop protection circuit as claimed in claim 1, is characterized in that: between the described thyristor control utmost point and described input, be connected with a resistance R 2.
4. open loop protection circuit as claimed in claim 1, is characterized in that: between described thyristor positive pole and described input, be connected with a resistance R 3.
5. an illuminator; comprise a power control; at least two light-emitting components that are mutually connected in series; and the as claimed in claim 1 open loop protection circuit in parallel with light-emitting component described in each, described at least two light-emitting components and described open loop protection circuit are connected between described power control both positive and negative polarity.
6. illuminator as claimed in claim 5, is characterized in that: described power control is constant-current type control device.
7. illuminator as claimed in claim 5; it is characterized in that: input and the output of described at least two open loop protection circuits are end to end, and the positive and negative electrode of described power control is connected to the input of open loop protection circuit described in one of them and with it described in adjacent another between output of open loop protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420332905.4U CN203984710U (en) | 2014-06-20 | 2014-06-20 | A kind of open loop protection circuit and there is the illuminator of this open loop protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420332905.4U CN203984710U (en) | 2014-06-20 | 2014-06-20 | A kind of open loop protection circuit and there is the illuminator of this open loop protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203984710U true CN203984710U (en) | 2014-12-03 |
Family
ID=51982125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420332905.4U Expired - Fee Related CN203984710U (en) | 2014-06-20 | 2014-06-20 | A kind of open loop protection circuit and there is the illuminator of this open loop protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203984710U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105228285A (en) * | 2014-06-20 | 2016-01-06 | 欧普照明股份有限公司 | A kind of open loop protection circuit and there is the illuminator of this open loop protection circuit |
-
2014
- 2014-06-20 CN CN201420332905.4U patent/CN203984710U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105228285A (en) * | 2014-06-20 | 2016-01-06 | 欧普照明股份有限公司 | A kind of open loop protection circuit and there is the illuminator of this open loop protection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141203 |