CN205124081U - Resistance -capacitance formula bleeder circuit and LED drive circuit - Google Patents
Resistance -capacitance formula bleeder circuit and LED drive circuit Download PDFInfo
- Publication number
- CN205124081U CN205124081U CN201520916351.7U CN201520916351U CN205124081U CN 205124081 U CN205124081 U CN 205124081U CN 201520916351 U CN201520916351 U CN 201520916351U CN 205124081 U CN205124081 U CN 205124081U
- Authority
- CN
- China
- Prior art keywords
- electric capacity
- resistance
- circuit
- diode
- switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model discloses a resistance -capacitance formula bleeder circuit and LED drive circuit, resistance -capacitance formula bleeder circuit includes main ON -OFF control circuit, power main switch M1 and the switch M2 that releases, power main switch M1's drain electrode is connected with first electric capacity C1 and rectification type resistance bleed -off circuit, rectification type resistance bleed -off circuit includes second diode D2, drain resistor RB and third diode D3, the anodal of second diode D2 is connected with first electric capacity C1, and the negative pole is connected with drain resistor RB, third diode D3's negative pole and first electric capacity C1 are connected the positive ground, release switch M2 the three -terminal respectively with drain resistor RB, be connected with main ON -OFF control circuit. The utility model discloses but optionally opens and turn -offs the bleeder circuit to save unnecessary power consumption when input voltage is higher. The bleeder current that produces can ensure two -way silicon controlled rectifier ware switching on under the degree of depth LED condition of adjusting luminance effectively.
Description
Technical field
The utility model relates to leadage circuit, especially a kind of resistance-capacitance type leadage circuit and LED drive circuit.
Background technology
Most of tunable optical incandescent lamp is controlled by triode ac switch/SCR light regulation device, and solid-state illumination (SSL) substitutes under incandescent lamp needs compatible bidirectional triode thyristor/controllable silicon dimmer and works.
Bidirectional triode thyristor is the bidirectional switch with specific latching feature.After triode ac switch triggers, the voltage at these device two ends is sufficiently high, flows through to make necessary latch-up current.This latch-up current must continue the regular hour and lock completely to make device.After bidirectional triode thyristor breech lock, certain magnitude current must flow continuously through triode ac switch device, to maintain conducting state.This electric current is called as maintenance electric current.Dissimilar dimmer has different maintenance electric currents, is generally several milliamperes to tens milliamperes.
In solid-state illumination field, export and be only about 1/10th of incandescent lamp with the power of the light consumption of incandescent lamp same brightness.This specular removal of solid-state illumination reduces along with progressive continuation of technology.Fundamentally, the ultimate challenge being used for by triode ac switch facing when controlling solid-state illumination circuit is to provide enough maintenance electric currents.Although compare with incandescent lamp, a very little LED load electric current just can produce the well-illuminated output of high light, this lower load current is but difficult to the normally maintaining controllable silicon dimmer.
As shown in Figure 1, existing modified model leadage circuit adds active switch between bleeder resistance and ground, makes leakage current can close/open according to loading condition.Such as, if the load of solid-state illumination is high enough to when can keep TRIAC dimmer conducting, control circuit maybe can turn off switch of releasing.If solid-state illumination underloading is to provide the maintenance electric current under controllable silicon dimmer degree of depth light modulation condition, so switch of releasing opened by control circuit.The loss of releasing like this switch of then releasing by being turned on or off is controlled, thus the high efficiency reached under non-light-load state and reduce the thermal stress of power conversion system to greatest extent.
It should be noted that: modified model leadage circuit needs interpolation High-tension Switch Devices, and active high-voltage switch gear is an expensive high-voltage switch gear.
Utility model content
Utility model object a: object is to provide a kind of resistance-capacitance type leadage circuit, to solve the problems referred to above that prior art exists.Further object is to provide one and LED drive circuit.
Technical scheme: a kind of resistance-capacitance type leadage circuit, comprise primary switch control circuit, power main switch M1 and the switch M2 that releases, the drain electrode of described power main switch M1 is connected with the first electric capacity C1 and rectification type resistance bleed-off circuit, and described rectification type resistance bleed-off circuit comprises the second diode D2, bleeder resistance RB and the 3rd diode D3; The positive pole of the second diode D2 is connected with the first electric capacity C1, and negative pole is connected with bleeder resistance RB; The negative pole of the 3rd diode D3 is connected with the first electric capacity C1, plus earth; Three ends of the described switch M2 that releases respectively with bleeder resistance RB, be connected with primary switch control circuit.
Preferably, the switch M2 that releases described in is MOSFET.Preferred, described in the switch M2 that releases be low pressure MOSFET.
A kind of LED drive circuit, comprises the resistance-capacitance type leadage circuit of above-mentioned any one, and controllable silicon dimmer, rectifier bridge, the second electric capacity C2, the first inductance L 1, first diode D1, the 3rd electric capacity C3; One end of one end of described second electric capacity C2, one end of the first inductance L 1 and the 3rd electric capacity C3 is connected to the DC bus of drawing from rectification bridge output end; The other end ground connection of described second electric capacity C2, the other end of described first inductance L 1 is connected with the drain electrode of power main switch M1 with the positive pole of the first diode D1, and the negative pole of the first diode D1 is connected with the other end of the 3rd electric capacity C3.
When controllable silicon dimmer is in degree of depth dimming state, when running under the low angle of flow, open by control signal the switch M2 that releases.
Beneficial effect: the utility model, from input power and DC bus aspect dissipation excess power, consumes bidirectional triode thyristor required maintenance electric current under degree of depth dimming state.The bleeder resistance of leadage circuit is connected a low-voltage active switch, optionally can open and turn off leadage circuit, to save unnecessary power loss when input voltage is higher.In the utility model, the leakage current of generation can ensure the conducting of TRIAC dimmer under degree of depth LED light modulation condition effectively.
Accompanying drawing explanation
Fig. 1 is the structural representation of prior art.
Fig. 2 is the structural representation of the utility model LED drive circuit.
Fig. 3 is the oscillogram of main switch and leadage circuit in the utility model.
Fig. 4 and Fig. 5 cut before being respectively/after cut dimmer controlled discharge signal waveforms
Embodiment
As shown in Figure 2, a kind of LED drive circuit, comprises resistance-capacitance type leadage circuit, and controllable silicon dimmer, rectifier bridge, the second electric capacity C2, the first inductance L 1, first diode D1, the 3rd electric capacity C3; One end of one end of described second electric capacity C2, one end of the first inductance L 1 and the 3rd electric capacity C3 is connected to the DC bus of drawing from rectification bridge output end; The other end ground connection of described second electric capacity C2, the other end of described first inductance L 1 is connected with the drain electrode of power main switch M1 with the positive pole of the first diode D1, and the negative pole of the first diode D1 is connected with the other end of the 3rd electric capacity C3.
Wherein, resistance-capacitance type leadage circuit comprises primary switch control circuit, power main switch M1 and the switch M2 that releases, the drain electrode of power main switch M1 is connected with the first electric capacity C1 and rectification type resistance bleed-off circuit, and described rectification type resistance bleed-off circuit comprises the second diode D2, bleeder resistance RB and the 3rd diode D3; The positive pole of the second diode D2 is connected with the first electric capacity C1, and negative pole is connected with bleeder resistance RB, and the positive pole of the 3rd diode D3 is connected with the first electric capacity C1, plus earth; One end of the described switch M2 that releases is connected with bleeder resistance RB, and one end ground connection, one end is connected with primary switch control circuit.
When controllable silicon dimmer is in degree of depth dimming state, run under the low angle of flow; In order to keep the conducting of dimmer, the secondary power consumption for generation of maintenance electric current is necessary.Under degree of depth light modulation condition, the control signal of leadage circuit opens the switch M2 that releases, and by the mode that the angle of flow of on-line checkingi DC bus-bar voltage is too low, the mode of opening switch of releasing can have several.
Once main switch M1 ends, the voltage of M1 drain node jumps to rapidly DC bus-bar voltage and adds LED load voltage.At this slope period TB due to the balance rule of capacitance charge shown in Fig. 3, C1 is discharged to the ground of the switch M2 that releases by bleeder resistance RB.Power grade of releasing on RB can because of the different value of electric capacity C1, the VDS alternating voltage of bleeder resistance RB and main switch M1 and different.
Cut before Fig. 4 and Fig. 5 gives and after cut the drainage method of dimmer.
In the utility model, the switching device of resistance-capacitance circuit outlet side, due to the isolation of the first electric capacity C1, can select low pressure MOSFET, and the high-voltage switch gear of releasing needed for method than regulating resistance active on market is cost-saving.Low pressure MOSFET is the generic term of this area, for describing the feature of part model MOSFET.First electric capacity C1 only need transmit little energy compared with nominal load, and therefore capacitance is very little, ensure that low cost and the small size of element.By slowing down VDS voltage change ratio under the first electric capacity C1 and diode resistance condition of contact, thus improve in main switch EMI performance.
More than describe preferred implementation of the present utility model in detail; but; the utility model is not limited to the detail in above-mentioned execution mode; within the scope of technical conceive of the present utility model; can carry out multiple equivalents to the technical solution of the utility model, these equivalents all belong to protection range of the present utility model.It should be noted that, the utility model can be suitable for the dc-dc converter topology of any type: comprise flyback, boosting, step-down, the AC-DC of buck-boost and DC-DC power source converter topologies.
Claims (4)
1. a resistance-capacitance type leadage circuit, comprise primary switch control circuit, power main switch M1 and the switch M2 that releases, it is characterized in that, the drain electrode of described power main switch M1 is connected with the first electric capacity C1 and rectification type resistance bleed-off circuit, and described rectification type resistance bleed-off circuit comprises the second diode D2, bleeder resistance RB and the 3rd diode D3; The positive pole of the second diode D2 is connected with the first electric capacity C1, and negative pole is connected with bleeder resistance RB; The negative pole of the 3rd diode D3 is connected with the first electric capacity C1, plus earth; Three ends of the described switch M2 that releases respectively with bleeder resistance RB, be connected with primary switch control circuit.
2. resistance-capacitance type leadage circuit as claimed in claim 1, is characterized in that, described in the switch M2 that releases be MOSFET.
3. resistance-capacitance type leadage circuit as claimed in claim 1, is characterized in that, described in the switch M2 that releases be low pressure MOSFET.
4. a LED drive circuit, is characterized in that, comprises the resistance-capacitance type leadage circuit described in any one of claims 1 to 3, and controllable silicon dimmer, rectifier bridge, the second electric capacity C2, the first inductance L 1, first diode D1, the 3rd electric capacity C3; One end of one end of described second electric capacity C2, one end of the first inductance L 1 and the 3rd electric capacity C3 is connected to the DC bus of drawing from rectification bridge output end; The other end ground connection of described second electric capacity C2, the other end of described first inductance L 1 is connected with the drain electrode of power main switch M1 with the positive pole of the first diode D1, and the negative pole of the first diode D1 is connected with the other end of the 3rd electric capacity C3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520916351.7U CN205124081U (en) | 2015-11-16 | 2015-11-16 | Resistance -capacitance formula bleeder circuit and LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520916351.7U CN205124081U (en) | 2015-11-16 | 2015-11-16 | Resistance -capacitance formula bleeder circuit and LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205124081U true CN205124081U (en) | 2016-03-30 |
Family
ID=55579646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520916351.7U Active CN205124081U (en) | 2015-11-16 | 2015-11-16 | Resistance -capacitance formula bleeder circuit and LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205124081U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105407595A (en) * | 2015-11-16 | 2016-03-16 | 江苏力行电力电子科技有限公司 | Capacitance-resistance leakage circuit and light emitting diode (LED) driving circuit |
-
2015
- 2015-11-16 CN CN201520916351.7U patent/CN205124081U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105407595A (en) * | 2015-11-16 | 2016-03-16 | 江苏力行电力电子科技有限公司 | Capacitance-resistance leakage circuit and light emitting diode (LED) driving circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102098853B (en) | Light emitting element driving system, driving control circuit and driving method | |
| CN103327694B (en) | Silicon controlled dimming LED drive circuit | |
| CN104125686B (en) | Safe-isolated and full-color LED lamp circuit and dimming method | |
| CN103025018B (en) | Light emitting diode (LED) drive circuit controlled by parallel connection high voltage metal oxide semiconductor (MOS) tube | |
| CN103945616B (en) | A kind of light fixture and LED drive device thereof | |
| CN203313500U (en) | Silicon controlled dimming LED driving circuit | |
| CN105407583A (en) | Single-pole quasi-resonance LED driving device based on Buck-Boost circuit and Flyback circuit | |
| CN103152955A (en) | Light emitting diode (LED) current detection and control circuit and controller thereof | |
| CN104797062B (en) | Non-strobe high-efficiency LED (light-emitting diode) driving manner compatible with phase-controlled light modulator | |
| CN102123552B (en) | Multi-path constant-current high-power LED (Light-Emitting Diode) driving power supply | |
| CN103596327B (en) | Non-isolation type LED drive circuit | |
| CN103025021A (en) | Step-down light emitting diode (LED) drive circuit based on electrical inductance discharge time modulation | |
| Pinto et al. | High-power-factor street lighting system to supply LEDs without energy consumption during the peak load time | |
| CN205124081U (en) | Resistance -capacitance formula bleeder circuit and LED drive circuit | |
| CN203872387U (en) | Power off non-stroboscopic second gear dimmable LED driving power supply | |
| CN105407595B (en) | Led drive circuit | |
| CN200965168Y (en) | Variable power WLED emergent lighting lamp | |
| CN203590550U (en) | Large-power LED lamp realized by adopting voltage-isolated fly-back controller | |
| CN103025017B (en) | Light-emitting diode (LED) driving circuit based on parallel switch control | |
| CN102791063A (en) | Intelligent LED module with function of automatic voltage regulation | |
| CN203984734U (en) | A kind of safety isolation full-color LED lamp circuit | |
| CN204157104U (en) | The uninterrupted emergency lighting system of subway LED | |
| CN210579355U (en) | Single live wire control circuit of diode | |
| CN203289704U (en) | Sectional type LED (Light-Emitting Diode) lamp capable of light modulation and free of external light modulator | |
| CN204948421U (en) | A kind of short-circuit protection circuit and intelligent dimming color-temperature regulating drive system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |