CN205793478U - A kind of drive circuit - Google Patents
A kind of drive circuit Download PDFInfo
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- CN205793478U CN205793478U CN201620330330.1U CN201620330330U CN205793478U CN 205793478 U CN205793478 U CN 205793478U CN 201620330330 U CN201620330330 U CN 201620330330U CN 205793478 U CN205793478 U CN 205793478U
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Abstract
The open a kind of drive circuit of this utility model, one end of described drive circuit connects load, the other end connects power supply, the positive pole of described power supply connects filter resistance, described filter resistance and the positive plate of filter capacitor, the minus plate of described filter capacitor is connected with the negative pole of described power supply, it is characterized in that, also include the first audion and the second audion, the base stage of described first audion is connected with positive source through described filter resistance with colelctor electrode, and the described emitter-base bandgap grading of the first audion is connected with the negative pole of power supply；The colelctor electrode of described second audion and the base stage of the first audion are connected, and the emitter-base bandgap grading of the second audion is connected with base stage, and is connected with the base stage of described first audion, and the base stage of described second audion is connected with power cathode.Use this utility model, eliminate ripple, improve the stability of LED lamp source.
Description
Technical field
This utility model relates to a kind of drive circuit, the drive circuit of a kind of active filter circuit.
Background technology
Light emitting diode (LED) light source driving circuit at present, generally use one pole APFC (PFC) circuit, but power factor to be improved, input can only have the electric capacity of low capacity, this causes sent out diode (LED) light source output ripple electric current very greatly, about 30-70%, and ripple current to be reduced is the most directly the filter capacitor increasing output, the volume that so can cause power supply is too big, and cost is the highest.
Utility model content
The purpose of this utility model provides a kind of drive circuit, eliminates the ripple of LED output circuit.
For solving the problem that prior art exists, this utility model provides a kind of drive circuit, one end of described drive circuit connects load, the other end connects power supply, the positive pole of described power supply connects filter resistance, described filter resistance and the positive plate of filter capacitor, the minus plate of described filter capacitor is connected with the negative pole of described power supply, it is characterized in that, also include the first audion and the second audion, the base stage of described first audion is connected with positive source through described filter resistance with colelctor electrode, and the described emitter-base bandgap grading of the first audion is connected with the negative pole of power supply；The colelctor electrode of described second audion and the base stage of the first audion are connected, and the emitter-base bandgap grading of the second audion is connected with base stage, and is connected with the base stage of described first audion, and the base stage of described second audion is connected with power cathode.
Also including that the 3rd audion, the described base stage of the 3rd audion are connected with the base stage of the second audion, the colelctor electrode of described 3rd audion is connected with the negative pole of power supply, and the emitter-base bandgap grading of described 3rd audion is connected with load.
It is in series with stabilivolt between base stage and the colelctor electrode of described first audion.
Described first audion emitter-base bandgap grading is connected with power cathode through the first resistor.
The colelctor electrode of described second audion connects through the second resistor and the first transistor base.
The emitter-base bandgap grading of described second audion connects through the base stage of the 3rd resistance and the first audion, is connected with load through the 4th resistance.
The colelctor electrode of described 3rd audion is connected with power cathode through the 5th resistance, and the emitter-base bandgap grading of described 3rd audion is connected with load through the 6th resistance.
Described power supply is that single-stage APFC drives power supply.
This utility model introduces the circuit eliminating ripple in LED lamp source drive circuit, has effectively eliminated ripple, has improve the stability of LED lamp source.
Accompanying drawing explanation
Fig. 1 is the circuit theory schematic diagram of the first embodiment of this utility model drive circuit；
Fig. 2 is the circuit theory schematic diagram of this utility model the second embodiment；
Fig. 3 is the circuit theory schematic diagram of the third embodiment of this utility model.
Detailed description of the invention
Below in conjunction with the accompanying drawings this utility model is described in detail.
With reference to Fig. 1, this figure is the circuit theory schematic diagram of this utility model drive circuit, this drive circuit, including: single-stage APFC (PFC LED Driver) drives power supply, filter circuit 20, and the ripple circuit 30 that disappears.
Single-stage PFC LED Driver, for the alternating current that outside inputs is converted into unidirectional current, and improve the power factor of power circuit, its input is connected with external power source, outfan is electrically connected with filter circuit 20, when implementing, can use rectification circuit that external input power alternating current is converted into unidirectional current, and use pfc circuit to provide the power factor of circuit.
Filter circuit 20, including filter capacitor C1 and filter resistance R1, wherein the pole plate resistance R1 after filtering of filter capacitor is connected with the positive pole of input power, and another pole plate of filter capacitor is directly connected with the negative pole of input power.
Disappear ripple circuit 30, and base stage resistance filtered with the colelctor electrode R1 including the first triode Q4 and the second triode Q3, the first audion Q4 is connected with positive source VO+, and the emitter-base bandgap grading of the first triode Q4 is connected with the negative pole VO-of power supply；The colelctor electrode of the second triode Q3 and the base stage of the first triode Q4 are connected, and the emitter-base bandgap grading of the second audion Q3 is connected with the base stage of base stage with the first triode Q4, and the base stage of the second triode Q3 is connected with power cathode VO-；Additionally, first triode Q4 and the base stage of the second audion Q3, emitter-base bandgap grading, colelctor electrode can be in order to avoid the first audion and the second audion are damaged by the impact of big electric current, concrete with termination resistor, the emitter-base bandgap grading of the first audion is in series with resistor R6, and colelctor electrode is in series with current-limiting resistor R5；The colelctor electrode of the second audion connects current-limiting resistors R4, and the emitter-base bandgap grading of the second resistor connects current-limiting resistors R7, above-mentioned current-limiting resistor R4, current-limiting resistor R5, current-limiting resistor R7, it is therefore prevented that audion is damaged by heavy current impact.
When implementing, the time constant of filter resistance R1 and filter capacitor C1 is several power frequency periods, ripple voltage in input capacitance C1 resistance R1 after filtering and the filtering of filter capacitor C1, producing the DC voltage of an approximation ripple-free on filter capacitor C1, this DC voltage is used for driving power tube Q4.Voltage ratio LED load voltage high PN junction voltage, about an about 0.7V on filter capacitor C1, because filter capacitor C1 voltage approximation ripple-free, so output LED load voltage also approximates ripple-free.When input capacitance C1 voltage is higher than LED load voltage, between colelctor electrode C and the emitter E of power tube pipe Q4, voltage VCE assume responsibility for the ripple voltage component in input capacitance C1, and its power is dissipated by pliotron.Additionally, during the first audion Q4 conducting, base stage Q3 of the first audion Q4 and the second audion is connected, therefore the second audion Q3 is also switched on, the electric current flowing through the second audion Q3 colelctor electrode is that filter capacitor C1 carries out quick charge, accelerate the charging rate of filter capacitor C1, reach the purpose of quick startup.
As shown in Figure 2, this figure is the circuit theory schematic diagram of this utility model the second embodiment, unlike first embodiment, the present embodiment also includes the 3rd audion Q2, the base stage of the three or three pole Q2 is connected with the base stage of the second audion, the colelctor electrode of the 3rd audion Q2 is connected with the negative pole VO-of power supply by resistor R2, and the emitter-base bandgap grading of the 3rd audion Q2 is connected with LED load by resistor R3.When circuit start, power cathode forms a reference current by R2 and Q2, and the electric current then obtained by the colelctor electrode of the second audion Q3 is filter capacitor C1 quick charge, plays the purpose of quickly startup.
With reference to Fig. 3, this figure is the circuit theory schematic diagram of this utility model the 3rd embodiment, and unlike the second embodiment, the present embodiment is in series with stabilivolt ZD1 between the base stage and colelctor electrode of the first audion.At circuit start, and when entering steady operation, stabilivolt ZD1 is inoperative, and when fluctuation occurs in load, ZD1 works, to prevent overtension, damages the first audion Q4.When specifically applying, the magnitude of voltage of stabilivolt ZD1 needs higher than the ripple voltage component in input capacitance C1.
Needing explanation, connection described in the utility model includes being directly connected to and being indirectly connected with.
The above is preferred implementation of the present utility model; it should be pointed out that, for those skilled in the art, on the premise of without departing from this utility model principle; can also make some improvements and modifications, these improvements and modifications are also considered as protection domain of the present utility model.
Claims (8)
1. a drive circuit, one end of described drive circuit connects load, the other end connects power supply, the positive pole of described power supply connects the positive plate of filter resistance, described filter resistance and filter capacitor, and the minus plate of described filter capacitor is connected with the negative pole of described power supply, it is characterized in that, also including that the first audion and the second audion, the base stage of described first audion are connected with positive source through described filter resistance with colelctor electrode, the described emitter-base bandgap grading of the first audion is connected with the negative pole of power supply；The colelctor electrode of described second audion and the base stage of the first audion are connected, and the emitter-base bandgap grading of the second audion is connected with base stage, and is connected with the base stage of described first audion, and the base stage of described second audion is connected with power cathode.
Drive circuit the most according to claim 1, it is characterized in that, also include that the 3rd audion, the described base stage of the 3rd audion are connected with the base stage of the second audion, the colelctor electrode of described 3rd audion is connected with the negative pole of power supply, and the emitter-base bandgap grading of described 3rd audion is connected with load.
Drive circuit the most according to claim 2, it is characterised in that be in series with stabilivolt between base stage and the colelctor electrode of described first audion.
Drive circuit the most according to claim 3, it is characterised in that described first audion emitter-base bandgap grading is connected with power cathode through the first resistor.
Drive circuit the most according to claim 4, it is characterised in that the colelctor electrode of described second audion connects through the second resistor and the first transistor base.
Drive circuit the most according to claim 5, it is characterised in that the emitter-base bandgap grading of described second audion connects through the base stage of the 3rd resistance and the first audion, is connected with load through the 4th resistance.
Drive circuit the most according to claim 6, it is characterised in that the colelctor electrode of described 3rd audion is connected with power cathode through the 5th resistance, the emitter-base bandgap grading of described 3rd audion is connected with load through the 6th resistance.
8. according to the drive circuit according to any one of claim 1-7, it is characterised in that described power supply is that single-stage APFC drives power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620330330.1U CN205793478U (en) | 2016-04-18 | 2016-04-18 | A kind of drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620330330.1U CN205793478U (en) | 2016-04-18 | 2016-04-18 | A kind of drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205793478U true CN205793478U (en) | 2016-12-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620330330.1U Active CN205793478U (en) | 2016-04-18 | 2016-04-18 | A kind of drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205793478U (en) |
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2016
- 2016-04-18 CN CN201620330330.1U patent/CN205793478U/en active Active
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |