CN202602959U - Bridge circuit and led driving circuit - Google Patents
Bridge circuit and led driving circuit Download PDFInfo
- Publication number
- CN202602959U CN202602959U CN 201220223836 CN201220223836U CN202602959U CN 202602959 U CN202602959 U CN 202602959U CN 201220223836 CN201220223836 CN 201220223836 CN 201220223836 U CN201220223836 U CN 201220223836U CN 202602959 U CN202602959 U CN 202602959U
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- diode
- current source
- led constant
- negative electrode
- electric ballast
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Abstract
The utility model discloses a bridge circuit and an LED driving circuit, wherein the bridge circuit comprises an electronic ballast, an LED constant current source and a bridge-type rectification circuit. The bridge-type rectification circuit is connected between the electronic ballast and the LED constant current source. The bridge-type rectification circuit comprises a first diode, a second diode, a third diode and a fourth diode, wherein the positive electrode of the first diode is connected with the negative electrode of the fourth diode and is also connected with an output terminal of the electronic ballast; the negative electrode of the first diode is connected with the negative electrode of the second diode, and is connected with the anode input terminal of the LED constant current source; the positive electrode of the second diode is connected with the negative electrode of the third diode, and is connected with the other output terminal of the electronic ballast; and the positive electrode of the third diode is connected with the positive electrode of the fourth diode, and is connected with the cathode input terminal of the LED constant current source. According to the bridge circuit and the LED driving circuit, the normal operation of the LED constant current source can be guaranteed.
Description
Technical field
The utility model relates to the LED technical field, relates in particular to a kind of bridgt circuit and led drive circuit.
Background technology
At present, existing LED constant-current source, it directly is connected with electric ballast.And because the signal that the output of electric ballast is exported is the AC signal of high frequency, when the signal of electric ballast output was positive half cycle, the LED constant-current source was in normal operating state; When the signal of electric ballast output is negative half period, the LED constant-current source will receive the influence of reverse voltage, and this reverse voltage might cause the LED constant-current source to be burnt out.
The utility model content
The main purpose of the utility model provides a kind of bridgt circuit, is intended to guarantee the operate as normal of LED constant-current source.
In order to achieve the above object, the utility model proposes a kind of bridgt circuit, and this bridgt circuit comprises electric ballast, LED constant-current source and bridge rectifier, and said bridge rectifier is connected between said electric ballast and the said LED constant-current source.
Preferably, said bridge rectifier comprises first diode, second diode, the 3rd diode and the 4th diode; The anode of said first diode is connected with the negative electrode of said the 4th diode; And be connected with an output of said electric ballast; The negative electrode of said first diode is connected with the negative electrode of said second diode; And be connected with the electrode input end of said LED constant-current source, the anode of said second diode is connected with the negative electrode of said the 3rd diode, and is connected with another output of said electric ballast; The anode of said the 3rd diode is connected with the anode of said the 4th diode, and is connected with the negative input of said LED constant-current source.
Preferably, the withstand voltage of said first diode, second diode, the 3rd diode and the 4th diode is 200-1000V.
Preferably, be 5ns-500ns the reverse recovery time of said first diode, second diode, the 3rd diode and the 4th diode.
The utility model also proposes a kind of led drive circuit; Said led drive circuit comprises bridgt circuit; Said bridgt circuit comprises electric ballast, LED constant-current source and bridge rectifier, and said bridge rectifier is connected between said electric ballast and the said LED constant-current source.
Preferably, said bridge rectifier comprises first diode, second diode, the 3rd diode and the 4th diode; The anode of said first diode is connected with the negative electrode of said the 4th diode; And be connected with an output of said electric ballast; The negative electrode of said first diode is connected with the negative electrode of said second diode; And be connected with the electrode input end of said LED constant-current source, the anode of said second diode is connected with the negative electrode of said the 3rd diode, and is connected with another output of said electric ballast; The anode of said the 3rd diode is connected with the anode of said the 4th diode, and is connected with the negative input of said LED constant-current source.
Preferably, the withstand voltage of said first diode, second diode, the 3rd diode and the 4th diode is 200-1000V.
Preferably, be 5ns-500ns the reverse recovery time of said first diode, second diode, the 3rd diode and the 4th diode.
The bridgt circuit that the utility model proposes; Through being connected a bridge rectifier between electric ballast and the LED constant-current source; This bridge rectifier converts the high frequency ac signal of electric ballast output into direct current signal; For the LED constant-current source provides operating voltage, make the LED constant-current source can not receive the influence of reverse voltage, thereby guaranteed the operate as normal of LED constant-current source.
Description of drawings
Fig. 1 is the electrical block diagram of the utility model bridgt circuit preferred embodiment.
The realization of the utility model purpose, functional characteristics and advantage will combine embodiment, further specify with reference to accompanying drawing.
Embodiment
Further specify the technical scheme of the utility model below in conjunction with Figure of description and specific embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Fig. 1 is the electrical block diagram of the utility model bridgt circuit preferred embodiment.
With reference to Fig. 1, the utility model bridgt circuit comprises electric ballast 101, LED constant-current source 102 and bridge rectifier 103.
Wherein, the input of electric ballast 101 is electrically connected with the city of 220V, and bridge rectifier 103 is connected between the input of output and LED constant-current source 102 of electric ballast 101.Bridge rectifier 103 is used for converting the high frequency ac signal that electric ballast 101 outputs are exported into direct current signal, then this direct current signal is flowed to the input of LED constant-current source 102, for LED constant-current source 102 provides operating voltage.
Concrete, bridge rectifier 103 comprises the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4.
Wherein, The anode of the first diode D1 is connected with the negative electrode of the 4th diode D4; And be connected with an output of electric ballast 101, the negative electrode of the first diode D1 is connected with the negative electrode of the second diode D2, and is connected with the electrode input end (+) of LED constant-current source 102; The anode of the second diode D2 is connected with the negative electrode of the 3rd diode D3; And be connected with another output of electric ballast 101, the anode of the 3rd diode D3 is connected with the anode of the 4th diode D4, and is connected with the negative input (-) of LED constant-current source 102.
Among the utility model embodiment, the withstand voltage of the first diode D1 in the above-mentioned bridge rectifier 103, the second diode D2, the 3rd diode D3 and the 4th diode D4 is 200-1000V.
And the first diode D1 in the above-mentioned bridge rectifier 103, the second diode D2, the 3rd diode D3 and the 4th diode D4 are fast recovery diode (being called for short FRD), and its reverse recovery time is very short.In the present embodiment, be 5ns-500ns the reverse recovery time of the above-mentioned first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4.
The bridgt circuit that the utility model proposes; Through being connected a bridge rectifier between electric ballast and the LED constant-current source; This bridge rectifier converts the high frequency ac signal of electric ballast output into direct current signal; For the LED constant-current source provides operating voltage, make the LED constant-current source can not receive the influence of reverse voltage, thereby guaranteed the operate as normal of LED constant-current source.
The utility model also proposes a kind of led drive circuit, and this led drive circuit comprises bridgt circuit, and the circuit structure of its bridgt circuit is identical with the circuit structure of the described bridgt circuit of top embodiment, repeats no more here.
The above is merely the preferred embodiment of the utility model; Be not thus the restriction the utility model claim; Every equivalent structure or equivalent flow process conversion that utilizes the utility model specification 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 utility model.
Claims (8)
1. a bridgt circuit is characterized in that, comprises electric ballast, LED constant-current source and bridge rectifier, and said bridge rectifier is connected between said electric ballast and the said LED constant-current source.
2. bridgt circuit according to claim 1 is characterized in that, said bridge rectifier comprises first diode, second diode, the 3rd diode and the 4th diode; The anode of said first diode is connected with the negative electrode of said the 4th diode; And be connected with an output of said electric ballast; The negative electrode of said first diode is connected with the negative electrode of said second diode; And be connected with the electrode input end of said LED constant-current source, the anode of said second diode is connected with the negative electrode of said the 3rd diode, and is connected with another output of said electric ballast; The anode of said the 3rd diode is connected with the anode of said the 4th diode, and is connected with the negative input of said LED constant-current source.
3. bridgt circuit according to claim 2 is characterized in that, the withstand voltage of said first diode, second diode, the 3rd diode and the 4th diode is 200-1000V.
4. bridgt circuit according to claim 2 is characterized in that, is 5ns-500ns the reverse recovery time of said first diode, second diode, the 3rd diode and the 4th diode.
5. a led drive circuit comprises bridgt circuit, it is characterized in that, said bridgt circuit comprises electric ballast, LED constant-current source and bridge rectifier, and said bridge rectifier is connected between said electric ballast and the said LED constant-current source.
6. led drive circuit according to claim 5 is characterized in that, said bridge rectifier comprises first diode, second diode, the 3rd diode and the 4th diode; The anode of said first diode is connected with the negative electrode of said the 4th diode; And be connected with an output of said electric ballast; The negative electrode of said first diode is connected with the negative electrode of said second diode; And be connected with the electrode input end of said LED constant-current source, the anode of said second diode is connected with the negative electrode of said the 3rd diode, and is connected with another output of said electric ballast; The anode of said the 3rd diode is connected with the anode of said the 4th diode, and is connected with the negative input of said LED constant-current source.
7. led drive circuit according to claim 6 is characterized in that, the withstand voltage of said first diode, second diode, the 3rd diode and the 4th diode is 200-1000V.
8. led drive circuit according to claim 6 is characterized in that, is 5ns-500ns the reverse recovery time of said first diode, second diode, the 3rd diode and the 4th diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220223836 CN202602959U (en) | 2012-05-17 | 2012-05-17 | Bridge circuit and led driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220223836 CN202602959U (en) | 2012-05-17 | 2012-05-17 | Bridge circuit and led driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202602959U true CN202602959U (en) | 2012-12-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220223836 Expired - Fee Related CN202602959U (en) | 2012-05-17 | 2012-05-17 | Bridge circuit and led driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202602959U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103945592A (en) * | 2013-01-21 | 2014-07-23 | 朗捷科技股份有限公司 | LED lamp tube compatible with electronic stabilizer having preheating current |
-
2012
- 2012-05-17 CN CN 201220223836 patent/CN202602959U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103945592A (en) * | 2013-01-21 | 2014-07-23 | 朗捷科技股份有限公司 | LED lamp tube compatible with electronic stabilizer having preheating current |
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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: 20121212 Termination date: 20190517 |