CN102548168B - Achieving circuit of detecting and controlling frequency-sweeping igniting - Google Patents
Achieving circuit of detecting and controlling frequency-sweeping igniting Download PDFInfo
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- CN102548168B CN102548168B CN201010599333.2A CN201010599333A CN102548168B CN 102548168 B CN102548168 B CN 102548168B CN 201010599333 A CN201010599333 A CN 201010599333A CN 102548168 B CN102548168 B CN 102548168B
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Abstract
The invention discloses a detection and control method for frequency-sweeping igniting and an achieving circuit. The achieving circuit comprises a latch, an adjustable oscillator, a inverter, an N channel metal oxide semiconductor field effect transistor (MOSFET), a resistor R1 and capacitors C3 and C4. A circuit composed of the capacitor C3 and the resistor R1 takes samples of OUT end signals in an igniting period. The sampled signals are transmitted to the inverter and the latch. The latch controls electricity charging and discharging of the capacitor C4. The voltage signals of the capacitor C4 control frequency changes of the adjustable oscillator. The achieving circuit is based on a new frequency-sweeping igniting mode, and can accurately detect and control igniting voltage and prolong service life of fluorescent lamps. The detection and control method for frequency-sweeping igniting and the achieving circuit have the advantages of being novel in achieving method, simple in circuit, low in process requirements, easy to integrate and the like.
Description
Technical field
The present invention relates to integrated circuit fields, be mainly used in compact fluorescent lamp driving chip system.Specifically, the invention provides a kind of method and realizing circuit of frequency-sweeping igniting Detection & Controling.
Background technology
Compact fluorescent lamp belongs to a kind of lighting apparatus, is widely used in the middle of family and public lighting.When compact fluorescent lamp reaches ignition voltage, electric energy conversion is luminous energy by compact fluorescent lamp, sends visible ray.
Compact fluorescent lamp system by LCC resonant circuit generation resonance to reach the ignition voltage required for compact fluorescent lamp.This voltage is up to hundreds of and even upper kilovolt.If do not controlled this ignition voltage, the life-span of compact fluorescent lamp can shorten.
At present, the compact fluorescent lamp system on market generally carries out the triggering of ignition voltage by unifrequency or frequency scanning to LCC circuit.Ignition voltage is not accurately controlled in such compact fluorescent lamp system.Therefore, the compact fluorescent lamp life-span in this system can corresponding shortening.
Summary of the invention
The invention provides a kind of method and realizing circuit of frequency-sweeping igniting Detection & Controling, be applicable in compact fluorescent lamp driving chip system.Instant invention overcomes in prior art and be difficult to accurate control points ignition voltage and the defect causing fluorescent lifetime to shorten, accurate test point ignition voltage holding point ignition voltage, the present invention extends the life-span of compact fluorescent lamp.
The following technical scheme of employing of the present invention:
A kind of method of frequency-sweeping igniting Detection & Controling and realizing circuit, comprise: latch, tunable oscillator, inverter, N-channel MOS FET and resistance R1 and electric capacity C3, C4, wherein, the output signal of described inverter is connected to described latch, the output signal of described latch is connected to the grid end of described N-channel MOS FET, the drain terminal of described N-channel MOS FET is connected to power supply, the source of described N-channel MOS FET is connected to one end of described electric capacity C4, also the input of described tunable oscillator is connected to, the other end of described electric capacity C4 is connected to ground, one end of described resistance R1 and described electric capacity C3 is connected to described inverter jointly, the other end of described resistance R1 is connected to ground, the other end of described electric capacity C3 is connected to OUT end.
Compared with prior art, tool of the present invention has the following advantages:
(1) this programme can accurately detection and control fluorescent lamp ignition voltage, by holding point ignition voltage protection compact fluorescent lamp, extends the useful life of compact fluorescent lamp.
(2) this programme reflects ignition voltage by high-voltage capacitance detection output slope, and technological requirement is lower, is easy to integrated.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of typical LCC resonant circuit.
Fig. 2 is traditional sweep method schematic diagram.
Fig. 3 is traditional compact fluorescent lamp sparking mode schematic diagram.
Fig. 4 is abnormal compact fluorescent lamp sparking mode schematic diagram.
Fig. 5 is sweep method schematic diagram of the present invention.
Fig. 6 is firing circuit designs schematic diagram of the present invention.
Fig. 7 is the waveform schematic diagram of each signal in firing circuit designs of the present invention.
Number in the figure illustrates: 10. latch, 11. tunable oscillators, 12. inverters, 13.N channel mosfet,
R1 is resistance, and C0, C1, C2, C3, C4 are electric capacity,
Arrow 21 represents electric current, and OUT1 represents that OUT1 holds,
Arrow OUT1 represents that OUT holds, and arrow Fout represents that Fout holds.
Embodiment
The present invention describes a kind of method and realizing circuit of frequency-sweeping igniting Detection & Controling in detail, is applicable to compact fluorescent lamp driving chip system.This realizing circuit detects output slope by high-voltage capacitance and reflects ignition voltage, therefore accurate control points ignition voltage can remain on rational scope, extends the life-span of compact fluorescent lamp.
Next the specific implementation circuit of this implementation method will be discussed in detail:
As shown in Figure 6, the realizing circuit of frequency-sweeping igniting Detection & Controling of the present invention, comprise: latch 10, tunable oscillator 11, inverter 12, N-channel MOS FET13 and resistance R1 and electric capacity C3, electric capacity C4, wherein, the output signal of described inverter 12 is connected to described latch 10, the output signal of described latch 10 is connected to the grid end of described N-channel MOS FET13, the drain terminal of described N-channel MOS FET13 is connected to power supply, the source of described N-channel MOS FET13 is connected to one end of described electric capacity C4, also the input of described tunable oscillator 11 is connected to, the other end of described electric capacity C4 is connected to ground, one end of described resistance R1 and described electric capacity C3 is connected to described inverter 12 jointly, the other end of described resistance R1 is connected to ground, the other end of described electric capacity C3 is connected to OUT end.
Figure 1 shows that the resonant circuit in compact fluorescent lamp system.As resistance L1, when resonance occurs for electric capacity C1, electric capacity C2, lamp Lamp two ends can produce ignition voltage.After lamp Lamp normally starts, electric capacity C2 is shorted, resistance L1, and the resonance frequency of resistance C1 changes, and resonant circuit exits resonance range, and so lamp Lamp enters normal operating conditions.As resistance L1, during electric capacity C1, electric capacity C0 resonance, flow through OUT1 power-off stream larger, therefore, the change of OUT1 terminal voltage is faster.As resistance L1, electric capacity C1, when resonance does not occur electric capacity C0, electric current is smaller, and the change of OUT1 terminal voltage is corresponding just smaller.Igniting testing circuit of the present invention detects the voltage at lamp Lamp two ends by the slope detecting OUT1 voltage.
Figure 2 shows that general compact fluorescent lamp system carries out the process of frequency scanning.When system starts, system enters warming up period, and this period is tO to t1 section, and this frequency is pre-heat frequency Fpre.When warming up period terminates, frequency enters sweep time, and this period is t1 to t2 section, and this frequency reduces gradually, and when frequency approaches resonance frequency, lamp voltage rise is high, and when lamp pressure reaches igniting value, lamp is opened.Scanning frequency continues to decline, until enter operating frequency Fosc.
Figure 3 shows that the situation of lamp pressure with frequency change.Curve I is resistance L1, electric capacity C1, the amplitude frequency curve of the resonant circuit that electric capacity C2 forms.Curve II is resistance L1, the amplitude frequency curve of the resonant circuit that electric capacity C1 forms.When frequency enters warming up period, the resonant circuit work of resistance L1, electric capacity C1, electric capacity C2 composition, lamp pressure reaches A point.Frequency reduces gradually, and lamp pressure is slowly close to resonance point, and lamp pressure raises gradually.When lamp pressure reaches ignition voltage B, lamp is opened, and electric capacity C2 is by Lamp short circuit, and the amplitude frequency curve of resonant circuit becomes curve II.Now, lamp pressure is reduced to C point.
When Figure 4 shows that lamp occurs abnormal, lamp pressure is with the situation of frequency change.Curve I is resistance L1, electric capacity C1, the amplitude frequency curve of the resonant circuit that electric capacity C2 forms.Curve II is resistance L1, the amplitude frequency curve of the resonant circuit that electric capacity C1 forms.When frequency enters warming up period, the resonant circuit work of resistance L1, electric capacity C1, electric capacity C2 composition, lamp pressure reaches A point.Frequency reduces gradually, and lamp pressure is slowly close to resonance point, and lamp pressure raises gradually.When lamp pressure reaches ignition voltage B, if the abnormal unlatching of lamp Lamp, electric capacity C2 can not by Lamp short circuit, and resonant circuit amplitude frequency curve I can not saltus step be curve two, and so frequency continues to rise, and lamp pressure continues to rise to C point.C point voltage is relatively very high, is more conducive to the unlatching of lamp Lamp, but has a significant impact the life-span of lamp Lamp.After lamp is opened, amplitude frequency curve I becomes curve II, and modulating voltage drops to D point.
The present invention proposes a kind of method and realizing circuit of frequency-sweeping igniting Detection & Controling, comprises a kind of new frequency sweeping method.Figure 5 shows that new frequency sweeping method.When frequency enters warming up period, this period is t0 to t1 section, and frequency keeps Fpre.When warming up period terminates, frequency enters the frequency sweep phase.Frequency declines gradually, and when lamp pressure reaches detected value, frequency remains Fglow, until lamp is opened, this period is burn period, and the time is t2 to t3 section.After lamp is opened, frequency also continues to decline.Until enter normal duty cycle, frequency remains Fosc.
Figure 6 shows that the structure chart of the igniting testing circuit that the present invention proposes.When OUT holds slope to increase, the electric current 21 flowing through resistance R1 increases, resistance voltage V
r1increase.Resistance voltage V
r1voltage increases, and reaches the threshold voltage vt h of inverter 12, and inverter output voltage exports as low-voltage.This output voltage is latched device 10 and latches, and latch output voltage Vcontrol is also low.It controls N-channel MOS FET13 and closes, and stops C4 charging, V
c4voltage remains unchanged.This voltage control tunable oscillator 11 works.Work as V
c4voltage remains unchanged, and tunable oscillator 11 exports Fout and remains unchanged.When OUT slope diminishes, the electric current 21 flowing through resistance R1 reduces, ohmically voltage V
r1reduce.V
r1voltage reduces, and lower than the threshold voltage vt h of inverter 12, inverter output voltage 22 exports as high voltage.This output voltage 22 is latched device 1O and latches, and latch output voltage Vcontrol is also high.It controls N-channel MOS FET13 and opens, and starts to charge to electric capacity C4, V
c4voltage raises.Work as V
c4when voltage raises, tunable oscillator 11 exports Fout frequency to be reduced.
Figure 7 shows that corresponding oscillogram in structure chart.When OUT voltage slope is smaller, V
r1voltage uprises thereupon.Work as V
r1during the threshold voltage vt h of voltage lower than inverter 12, latch output voltage Vcontrol remains low.V
c4voltage can increase, and Fout frequency reduces.When OUT terminal voltage slope becomes large, V
r1voltage uprises thereupon.Work as V
r1during the threshold voltage vt h of voltage higher than inverter 12, latch output voltage Vcontrol is by high step-down.V
c4voltage can remain unchanged, and Fout frequency also can remain on Fglow frequency simultaneously.
Claims (2)
1. the realizing circuit of frequency-sweeping igniting Detection & Controling, comprise latch (10), tunable oscillator (11), inverter (12), N-channel MOS FET (13) and resistance R1 and electric capacity C3, C4, it is characterized in that, the output signal of described inverter (12) is connected to described latch (10), the output signal of described latch (10) is connected to the grid end of described N-channel MOS FET (13), the drain terminal of described N-channel MOS FET (13) is connected to power supply, the source of described N-channel MOS FET (13) is connected to one end of described electric capacity C4, also the input of described tunable oscillator (11) is connected to, the other end of described electric capacity C4 is connected to ground, one end of described resistance R1 and described electric capacity C3 is connected to described inverter (12) jointly, the other end of described resistance R1 is connected to ground, the other end of described electric capacity C3 is connected to OUT end.
2. the realizing circuit of a kind of frequency-sweeping igniting Detection & Controling according to claim 1, is characterized in that, lamp pressure reach that ignition voltage to lamp opens during this period of time in, the frequency of circuit remains unchanged.
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| CN201010599333.2A CN102548168B (en) | 2010-12-21 | 2010-12-21 | Achieving circuit of detecting and controlling frequency-sweeping igniting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010599333.2A CN102548168B (en) | 2010-12-21 | 2010-12-21 | Achieving circuit of detecting and controlling frequency-sweeping igniting |
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| CN102548168B true CN102548168B (en) | 2015-01-21 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101426324A (en) * | 2008-12-05 | 2009-05-06 | 上海贝岭股份有限公司 | Fluorescent lamp starting process controlling circuit and control method therefor |
| CN101720158A (en) * | 2009-12-17 | 2010-06-02 | 上海贝岭股份有限公司 | Fluorescent lamp starting and scanning control circuit and control method thereof |
| CN101877571A (en) * | 2010-05-21 | 2010-11-03 | 西安电子科技大学 | Multi-frequency oscillator applied to electronic ballast |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2693073B2 (en) * | 1992-01-28 | 1997-12-17 | 松下電工株式会社 | Pulse generation circuit |
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2010
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101426324A (en) * | 2008-12-05 | 2009-05-06 | 上海贝岭股份有限公司 | Fluorescent lamp starting process controlling circuit and control method therefor |
| CN101720158A (en) * | 2009-12-17 | 2010-06-02 | 上海贝岭股份有限公司 | Fluorescent lamp starting and scanning control circuit and control method thereof |
| CN101877571A (en) * | 2010-05-21 | 2010-11-03 | 西安电子科技大学 | Multi-frequency oscillator applied to electronic ballast |
Non-Patent Citations (2)
| Title |
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| JP特開平5-207756 1993.08.13 * |
| 毛兴武,祝大卫.第5章紧凑型荧光灯电子镇流器.《新型电子镇流器电路原理与设计》.2007,第244-280页. * |
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