CN202841639U - Light-emitting diode (LED) driving power device - Google Patents
Light-emitting diode (LED) driving power device Download PDFInfo
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- CN202841639U CN202841639U CN 201220529820 CN201220529820U CN202841639U CN 202841639 U CN202841639 U CN 202841639U CN 201220529820 CN201220529820 CN 201220529820 CN 201220529820 U CN201220529820 U CN 201220529820U CN 202841639 U CN202841639 U CN 202841639U
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Abstract
The utility model discloses a large capacitance rapid discharge device of a light-emitting diode (LED) driving power output end, and belongs to the technical field of the LED driving power. The LED driving power device comprises an input or output rectifier and filter circuit, a high-frequency transformer, a pulse-width modulation (PWM) switch and a direct current (DC) circuit, and further comprises a rapid discharge circuit. The rapid discharge circuit comprises a power switch detecting circuit, a control circuit and a discharge circuit. One end of the power switch detecting circuit is connected between the high-frequency transformer and the output rectifier and filter circuit, the other end of the power switch detecting circuit which is connected with control circuit collects a switch signal. The control circuit controls logically according to the switch signal collected by the power switch detecting circuit and decides if the discharge circuit is conducting. The LED driving power device has the advantages of discharging the energy in the large capacitance rapidly, solving problems of afterglow and loss of efficiency due to slow discharge. A load resistor is out of the operating state when the LED driving power is in normal work, and thus the work efficiency of the LED driving power can not be effected.
Description
Technical field
The utility model relates to LED driving power technical field, relates in particular to a kind of large electric capacity Quick discharger of LED driving power output.
Background technology
Along with fast development and the application of LED technology, the LED driving power as LED can luminescence display pith, it comes into one's own day by day; LED majority on the market with DC power supply as driving, so the LED driving power also mostly be to be used with the switch DC voltage source.At present to use be that a kind of type of drive is " acyclic type PFC " to the LED driving power comparatively widely, and this type of drive has that high efficiency, High Power Factor, harmonic wave are little, low cost and other advantages; But because its output low frequency ripple is large, in order to solve the large problem of ripple, technology commonly used is carried out filtering for adding a very jumbo electric capacity at output, drop to ripple very little, but filter capacitor can be stored a lot of energy after outage, the output end voltage of LED driving power is fallen slowly, still continue bright a period of time, i.e. twilight sunset phenomenon after causing the switch of LED lamp to disconnect.
For the twilight sunset phenomenon of the switch that solves the LED lamp after disconnecting, reduce persistence, in the prior art generally the output at the LED driving power increase by a load, make it possible to accelerate on the filter capacitor energy and release; But the load resistance that the load that newly increases comprises is always in running order in the circuit of LED driving power, greatly affects the operating efficiency of LED driving power.
Summary of the invention
In order to solve above-mentioned existing technical deficiency and defective, the purpose of this utility model is to provide a kind of LED driving power Quick discharger of high workload efficient.
The purpose of this utility model is achieved by the following technical solution:
A kind of LED drive electric power unit mainly comprises I/O current rectifying and wave filtering circuit, high frequency transformer, PWM switch and DC circuit; Also comprise quick discharging circuit, described quick discharging circuit comprises power switch detection circuit, control circuit and discharge circuit; One end of described power switch detection circuit is connected between described high frequency transformer and the described output rectifier and filter, and the other end connects described control circuit, and its collection also provides switching signal; Described control circuit carries out logic control according to the switching signal that power switch detection circuit provides, and determines the whether conducting of described discharge circuit.
As optimal technical scheme of the present utility model, described power switch detection circuit comprises the first resistance and first crystal triode, one end of described the first resistance is connected between described high frequency transformer and the described output rectifier and filter, and the base stage of the other end and described first crystal triode is joined; The emitter of described first crystal triode is connected with the negative pole of described DC circuit, and collector electrode is connected between the second resistance and the first electric capacity.
As optimal technical scheme of the present utility model, described control circuit comprises the second resistance and the first electric capacity, one end of described the second resistance connects the positive pole of described DC circuit, the other end connects the collector electrode of first crystal triode and extends an end that is connected to described the first electric capacity, and the other end of described the first electric capacity is connected with the negative pole of described DC circuit.
As optimal technical scheme of the present utility model, described discharge circuit comprises the 3rd resistance and the second transistor, and an end of described the 3rd resistance is connected with the positive pole of described DC circuit, and the other end is connected with the collector electrode of the second transistor; The base stage of described the second transistor is connected between described the second resistance and the first electric capacity, and emitter is connected to the negative pole of described DC circuit.
As optimal technical scheme of the present utility model, described DC circuit is LED lamp or LED integrated optical source.
As optimal technical scheme of the present utility model, described output rectifier and filter comprises rectifier diode, anodic bonding first resistance of described rectifier diode, and the switch of the Current limited Control first crystal triode by the first resistance is controlled its conducting and cut-off.
As optimal technical scheme of the present utility model, described first crystal triode and described the second transistor all are bipolarity NPN triode.
In sum, LED drive electric power unit provided by the utility model has:
1, when the switch of LED lamp disconnects, the large electric capacity of the output of LED driving power is carried out repid discharge, make the voltage of LED driving power be down to rapidly the safe voltage scope of hundreds of millivolt.
2, can reduce output end voltage fall time by quick discharging circuit, thereby reduce the twilight sunset phenomenon that descends and cause slowly because of output voltage, and in the production test procedure because of the tactile device failure that causes of device and charged electric capacity misconnection.
3, in quick discharging circuit, load resistance is in off position when the LED driving power works; Only when the LED driving power disconnected, load resistance was just in running order; Thereby improve the operating efficiency of LED driving power.
Description of drawings
Fig. 1 is the schematic block diagram of a kind of LED drive electric power unit of the present utility model.
Fig. 2 is the structural representation of a kind of LED drive electric power unit of the utility model embodiment.
Description of reference numerals: T1, high frequency transformer, D1, rectifier diode, C1, the first electric capacity, C2, the second electric capacity, R1, the first resistance, R2, the second resistance, R3, the 3rd resistance, Q1, first crystal triode, Q2, the second transistor.
Embodiment
Below in conjunction with drawings and Examples the utility model is further specified.
Shown in accompanying drawing 1 and accompanying drawing 2, the invention provides a kind of LED drive electric power unit, be used for the large electric capacity repid discharge to LED driving power output; This device mainly comprises input rectifying filter circuit, high frequency transformer, PWM switch, output rectifier and filter and DC circuit; Also comprise quick discharging circuit, this quick discharging circuit comprises power switch detection circuit, control circuit and discharge circuit; One end of described power switch detection circuit is connected between described high frequency transformer and the described output rectifier and filter, and the other end connects described control circuit, and its collection also provides switching signal; Described control circuit carries out logic control according to the switching signal that power switch detection circuit provides, and determines the whether conducting of described discharge circuit.
Wherein, the described DC circuit of the utility model embodiment is the LED lamp.
The large electric capacity quick discharging circuit of the LED driving power output of the utility model embodiment is directly by civil power access input rectifying filter circuit, by high frequency transformer (T1) voltage is processed again, its medium/high frequency transformer (T1) has the control of PWM switch, again through the output of output rectifier and filter direct current and access LED lamp, to LED lamp supply direct current.
Described output rectifier and filter comprises rectifier diode (D1) and the second electric capacity (C2), the cathode output end of the anodic bonding tremendously high frequency transformer (T1) of described rectifier diode (D1), and negative electrode connects the positive pole of LED lamp.One end of described the second electric capacity (C2) is connected between described rectifier diode (D1) and the LED lamp, and the other end connects the negative pole of LED lamp.
Described power switch detection circuit is responsible for gathering the switch situation of LED driving power, and switching signal is provided for described control circuit.It comprises the first resistance (R1) and first crystal triode (Q1), one end of described the first resistance (R1) is connected between the anode of high frequency transformer (T1) cathode output end and rectifier diode (D1), the cathode output end of its medium/high frequency transformer (T1) is connected to the anode of rectifier diode (D1), and the other end is connected with described first crystal triode (Q1) base stage; The emitter of described first crystal triode (Q1) is connected with the negative pole of described LED lamp.The anode of described rectifier diode (D1) can be controlled the switch of first crystal triode (Q1), and then control its conducting and cut-off by after the first resistance (R1) current limliting.
Described control circuit carries out logic control according to the switching signal that described power switch detection circuit provides, and determines the whether conducting of described discharge circuit.It comprises the second resistance (R2) and the first electric capacity (C1), and described the second resistance (R2) end connects the collector electrode of first crystal triode (Q1), and the other end connects the positive pole of LED lamp, and described the second resistance (R2) also is to play metering function.Shown in an end of the first electric capacity (C1) connect the emitter of first crystal triode (Q1); The other end connects the base stage of the second transistor (Q2), and extends the collector electrode that is connected to first crystal triode (Q1), and described the first electric capacity (C1) is used for keeping the second transistor (Q2) malfunction can not occur.
Described discharge circuit comprises the 3rd resistance (R3) and the second transistor (Q2), and an end of described the 3rd resistance (R3) connects the positive pole of LED lamp, and the other end is connected with the collector electrode of the second transistor (Q2).One end of the emitter of described the second transistor (Q2) and the negative pole of LED lamp, the first electric capacity (C1), the emitter of first crystal triode (Q1) join.
The first crystal triode (Q1) of the utility model embodiment and the second transistor (Q2) all are bipolarity NPN triode, MBBT4401 for example, BCX56 etc.
The utility model embodiment is the voltage signal that detects the anode of rectifier diode (D1) by power switch detection circuit, the anode of rectifier diode (D1) has pulse voltage when the LED driving power works, detect this pulse voltage after control circuit discharge circuit cuts out; The anode no pulse voltage of rectifier diode (D1) when the LED driving power is not worked, namely pulse voltage stops, and detects pulse voltage and stops rear control circuit discharge circuit is opened.
The above embodiment has only expressed preferred implementation of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim and embodiment.Should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.
Claims (7)
1. LED drive electric power unit, mainly comprise I/O current rectifying and wave filtering circuit, high frequency transformer, PWM switch and DC circuit, it is characterized in that: also comprise quick discharging circuit, described quick discharging circuit comprises power switch detection circuit, control circuit and discharge circuit;
One end of described power switch detection circuit is connected between described high frequency transformer and the described output rectifier and filter, and the other end connects described control circuit, and its collection also provides switching signal;
Described control circuit carries out logic control according to the switching signal that power switch detection circuit provides, and determines the whether conducting of described discharge circuit.
2. LED drive electric power unit according to claim 1, it is characterized in that: described power switch detection circuit comprises the first resistance and first crystal triode, one end of described the first resistance is connected between described high frequency transformer and the described output rectifier and filter, and the base stage of the other end and described first crystal triode is joined; The emitter of described first crystal triode is connected with the negative pole of described DC circuit, and collector electrode is connected between the second resistance and the first electric capacity.
3. LED drive electric power unit according to claim 1, it is characterized in that: described control circuit comprises the second resistance and the first electric capacity, one end of described the second resistance connects the positive pole of described DC circuit, and the other end connects the collector electrode of first crystal triode and extends an end that is connected to described the first electric capacity; The other end of described the first electric capacity is connected with the negative pole of described DC circuit.
4. LED drive electric power unit according to claim 1, it is characterized in that: described discharge circuit comprises the 3rd resistance and the second transistor, one end of described the 3rd resistance is connected with the positive pole of described DC circuit, and the other end is connected with the collector electrode of the second transistor; The base stage of described the second transistor is connected between described the second resistance and the first electric capacity, and emitter is connected to the negative pole of described DC circuit.
5. arbitrary described LED drive electric power unit according to claim 1-4, it is characterized in that: described DC circuit is LED lamp or LED integrated optical source.
6. LED drive electric power unit according to claim 1, it is characterized in that: described output rectifier and filter comprises rectifier diode, anodic bonding first resistance of described rectifier diode.
7. arbitrary described LED drive electric power unit according to claim 1-6, it is characterized in that: described first crystal triode and described the second transistor all are bipolarity NPN triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220529820 CN202841639U (en) | 2012-10-17 | 2012-10-17 | Light-emitting diode (LED) driving power device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220529820 CN202841639U (en) | 2012-10-17 | 2012-10-17 | Light-emitting diode (LED) driving power device |
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| Publication Number | Publication Date |
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| CN202841639U true CN202841639U (en) | 2013-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220529820 Expired - Fee Related CN202841639U (en) | 2012-10-17 | 2012-10-17 | Light-emitting diode (LED) driving power device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102869173A (en) * | 2012-10-17 | 2013-01-09 | 深圳市聚作照明股份有限公司 | Light-emitting diode (LED) drive power supply device |
| WO2016041122A1 (en) * | 2014-09-15 | 2016-03-24 | 深圳市聚作照明股份有限公司 | Quick start circuit of led drive power supply |
| CN105453698A (en) * | 2013-07-30 | 2016-03-30 | 皇家飞利浦有限公司 | Apparatus for driving load via converter |
| CN106559932A (en) * | 2015-09-28 | 2017-04-05 | 李顺华 | A kind of drive circuit of ballast formula LED |
| CN107920404A (en) * | 2016-10-10 | 2018-04-17 | 矽诚科技股份有限公司 | LED drive system with quick voltage adjustment circuit |
| CN108010483A (en) * | 2017-12-12 | 2018-05-08 | 威创集团股份有限公司 | discharge control device and large screen display system |
-
2012
- 2012-10-17 CN CN 201220529820 patent/CN202841639U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102869173A (en) * | 2012-10-17 | 2013-01-09 | 深圳市聚作照明股份有限公司 | Light-emitting diode (LED) drive power supply device |
| WO2014059796A1 (en) * | 2012-10-17 | 2014-04-24 | 深圳市聚作照明股份有限公司 | Led driving power supply device |
| CN105453698A (en) * | 2013-07-30 | 2016-03-30 | 皇家飞利浦有限公司 | Apparatus for driving load via converter |
| CN105453698B (en) * | 2013-07-30 | 2017-10-03 | 飞利浦照明控股有限公司 | For the device via converter driving load |
| WO2016041122A1 (en) * | 2014-09-15 | 2016-03-24 | 深圳市聚作照明股份有限公司 | Quick start circuit of led drive power supply |
| CN106559932A (en) * | 2015-09-28 | 2017-04-05 | 李顺华 | A kind of drive circuit of ballast formula LED |
| CN107920404A (en) * | 2016-10-10 | 2018-04-17 | 矽诚科技股份有限公司 | LED drive system with quick voltage adjustment circuit |
| CN107920404B (en) * | 2016-10-10 | 2019-05-24 | 矽诚科技股份有限公司 | LED drive system with quick voltage adjustment circuit |
| CN108010483A (en) * | 2017-12-12 | 2018-05-08 | 威创集团股份有限公司 | discharge control device and large screen display system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Shenzhen Dongfangzhixing Power Supply Co., Ltd. Assignor: Shenzhen Juzuo Lighting Co.,Ltd. Contract record no.: 2014440020083 Denomination of utility model: Light-emitting diode (LED) drive power supply device Granted publication date: 20130327 License type: Exclusive License Record date: 20140328 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| 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: 20130327 Termination date: 20191017 |