CN2845392Y - Electronic fluorescent ballast with frequency converting pre-heating, re-starting and abnormal protecting - Google Patents
Electronic fluorescent ballast with frequency converting pre-heating, re-starting and abnormal protecting Download PDFInfo
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- CN2845392Y CN2845392Y CN 200520115847 CN200520115847U CN2845392Y CN 2845392 Y CN2845392 Y CN 2845392Y CN 200520115847 CN200520115847 CN 200520115847 CN 200520115847 U CN200520115847 U CN 200520115847U CN 2845392 Y CN2845392 Y CN 2845392Y
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Abstract
The utility model relates to the technical field of electronic energy-saving lighting, particularly an electronic ballast of a fluorescent lamp with variable frequencies, pre-heating and re-starting functions and abnormal protection. The utility model is provided with a metallic casing, an EMI filter which suppresses power supply and electromagnetic interference, a power supply bridge pile rectification circuit, an active power factor correction booster converter APFC, an MOSFET half-bridge or complete-bridge inverter and a strip lamp load circuit. A universal self-oscillation IC chip is provided with a control circuit with variable frequencies, pre-heating and re-starting functions and abnormal protection, and the control circuit causes a fluorescent lamp to be started via soft start procedures of three stages of cathode preheating procedure, the transition of the frequency from a high vale to a low value and the ignition of a strip lamp to emit light. The control circuit has many integrated functions of frequency conversion, preheating function, restarting function, and abnormal protection and the functions are complete. Compared with a special device, the utility model has the advantages of unusually decreased cost and good cost performance ratio.
Description
Technical field
The utility model relates to electric energy-saving lighting electric light source technical field, specifically is the electronic ballast for fluoresent lamp that a kind of frequency converting and preheating can restart the band abnormal protection.
Background technology
At present, widely the fluorescent lamp of Shi Yonging belongs to cathode preheat actuated type electric light source, many advertising electric ballasts are often advocated as advantage with the quick Starting mode of " a bit promptly bright ", this negative electrode expection hot type electronic ballast for fluoresent lamp one big defective just in fact, fluorescent lamp was very thin because of near space charge around its negative electrode before starting, start fast then filament in this way to tube cathode, lamp tube ends applies voltage and current simultaneously, cathode emission material has not reached the thermoelectricity that is higher than 700 ℃ far away emission state, and high pressure can not be with the fluorescent tube ionization puncture in the short time, produce glow discharge and carry out the transition to arc discharge, cause the serious sputter of the cathode emission material of fluorescent lamp, make tube wall blackout around the filament of its lamp tube ends, premature damage causes fluorescent tube to shorten greatly useful life.The fluorescent lamp pipeline start up by preheating generally adopts the mode of PTC thermistor in the prior art, and is simple in structure, inexpensive, is consistency and poor reliability but there is subject matter.In addition; electric ballast because of with the auxiliary work of fluorescent lamp power requirements; when various unusual condition occurring because of certain reason in the use; therefore electric ballast can not damage; because fluorescent tube specification misloading; lamp and ballast loose contact, lamp tube air leaking, filament disconnection etc.; electric ballast is not taked the corresponding protection measure; can cause damaging; prior art abnormal protection master scheme has multiple; as types such as current-limiting protection, overcurrent protection, overvoltage protections, its circuit is to distinguish independent design and installation mostly, the function of shortcoming integrated protection.
The utility model content
The purpose of this utility model provides the variable preheating soft start of a kind of general self-oscillation IC chip frequency; in fluorescent tube and abnormality such as the ballast specification is unworthy of or lamp loose contact or device be overheated; the fault protection circuit device is not damaged, and the frequency converting and preheating that can resume work after fixing a breakdown can restart band abnormal protection electronic ballast for fluoresent lamp.
The utility model technical solution; be provided with metal shell and suppress power supply electromagnetic interference electromagnetic interface filter 2; power supply bridge heap rectification circuit 3; Active Power Factor Correction booster converter APFC4; self-oscillating driver IC6; MOSFET half-bridge or full-bridge inverter 7; fluorescent tube pipe load circuit 9 constitutes; self-oscillating driver IC6 also is provided with frequency converting and preheating can restart band abnormal protection control circuit 8; D.C. regulated power supply 5 for control circuit; the connected mode of this circuit of electronic ballast is to enter in grid alternating current source 1 to insert between the rectification circuit 3 to suppress power supply electromagnetic interference electromagnetic interface filter 2; 3 outputs of power supply bridge heap rectification circuit insert Active Power Factor Correction and press converter APFC4; D.C. regulated power supply 5 for control circuit draws the inductor high-frequency pulse voltage of pressing converter APFC4 from the active power factor correcting; through rectification; filtering; voltage stabilizing inserts self-oscillating driver IC6 respectively; frequency converting and preheating can restart the power end Vcc of band abnormal protection control circuit 8; the input that frequency converting and preheating can restart band abnormal protection control circuit 8 is connected to the output voltage that the source power factor correcting is pressed converter APFC4 respectively; MOSFET half-bridge or full-bridge inverting output voltage 7; lamp load current detector 88; overtemperature detector 89 output signals, its output meet the frequency control terminal C of self-oscillating driver IC6
T
And frequency converting and preheating can restart band abnormity protection circuit 8; relatively trigger 81, two single limit voltage comparator 82,86, frequency conversion electric capacity switch equivalent switch 83, dual-threshold voltage comparator 85, current switch 87, lamp load current detector 88, overtemperature detector 89, reference voltage 84 and form by the inverter input/output voltage for it; wherein, the inverter input/output voltage compares trigger 81 inserts self-oscillating driver IC6 through two single limit voltage comparators 82,86, current switches 87 of serial frequency control terminal C
TSimultaneously, single limit voltage comparator 82,86 inserts reference voltage, and frequency conversion electric capacity switches equivalent switch 83 1 termination powers, the other end is connected between single limit voltage comparator 82,86 of dual serial, also has an end to be attempted by the frequency control terminal C of self-oscillating driver IC6
T, dual-threshold voltage comparator 85 inserts lamp load current detector 88 and overtemperature detector 89 and reference voltage 84 respectively, and its output inserts the frequency control terminal C of self-oscillating driver IC6 through current switch 87
T
Lamp load current detector 88, it is to pass a bead by the lead that connects fluorescent tube 9, is wound with step-up coil and through diode detection, RC filtering, its output inserts dual-threshold voltage comparator 85 on this magnet ring;
The technical program is to adopt the technology of switching circuit frequency converting and preheating at the frequency of oscillation control end of general fluorescent lamp ballast self-oscillation pulse driver chip IC 6, be that impedance changes to ballast output end lamp load LC series resonant circuit, make its fluorescent lamp starting elder generation process cathode preheat, frequency by high step-down transition, the soft start step that enters igniting pilot light pipe luminous three phases is come prolonging lamp tube useful life, it is controlled to have the frequency conversion time, to compare working stability reliable with the thermistor preheating method, compares cost with dedicated devices and significantly reduce.The protection of this ballast abnormality is provided with overvoltage, overcurrent, overheated multiple circuit; multiple functional; restarting circuit is to be based upon to fix a breakdown; the protection of removing the abnormal condition of lamp tube state is under the condition; circuit of electronic ballast could recover the normal operation work of energising; therefore frequency converting and preheating restarts the control circuit of the multiple function fusion of abnormal protection one, has the good ratio of performance to price.
Description of drawings
Fig. 1 is the utility model circuit of electronic ballast block diagram.
Fig. 2 is that frequency converting and preheating restarts abnormal protection control circuit block diagram.
Fig. 3 is a frequency converting and preheating switching circuit principle isoboles.
Fig. 4 is that embodiment 1 frequency converting and preheating restarts abnormal protection control circuit figure.
Fig. 5 is embodiment 2 frequency converting and preheating circuit and principle isoboles.
With reference to Fig. 1; it is provided with and suppresses power supply electromagnetic interference electromagnetic interface filter 2; power supply bridge heap rectification circuit 3; Active Power Factor Correction booster converter APFC4; self-oscillating driver IC6; MOSFET half-bridge or full-bridge inverter 7; tube load circuit 9 constitutes; self-oscillating driver IC6 also is provided with frequency converting and preheating can restart band abnormal protection control circuit 8; D.C. regulated power supply 5 for control circuit; the connected mode of this circuit of electronic ballast is to enter in grid alternating current source 1 to insert between the rectification circuit 3 to suppress power supply electromagnetic interference electromagnetic interface filter 2; 3 outputs of power supply bridge heap rectification circuit insert Active Power Factor Correction and press converter APFC4; D.C. regulated power supply 5 for control circuit draws the inductor high-frequency pulse voltage of pressing converter APFC4 from the active power factor correcting; through rectification; filtering; voltage stabilizing inserts self-oscillating driver IC6 respectively; frequency converting and preheating can restart the power end Vcc of band abnormal protection control circuit 8; the input that frequency converting and preheating can restart band abnormal protection control circuit 8 is connected to the output voltage that the source power factor correcting is pressed converter APFC4 respectively; MOSFET half-bridge or full-bridge inverting output voltage 7; lamp load current detector 88; overtemperature detector 89 output signals, its output meet the frequency control terminal C of self-oscillating driver IC6
T
With reference to Fig. 2, Fig. 3, three rank soft start steps of frequency converting and preheating process are: one, and energized, initial time is t
0Single limit voltage comparator 82,86 input pickup resistances begin electric capacity is charged, and with reference voltage relatively after, it is output as H single limit voltage comparator 82, single limit voltage comparator 86 outputs are then a little more than 0, and frequency conversion electric capacity switches equivalent switch 83 and instead is in cut-off state partially in power Vcc, and promptly K1, K2 open a way, the C of self-oscillation IC6
TEnd has only C2 regularly, and frequency is higher, and is lower away from lamp load LC resonance frequency output voltage, only lamp cathode is carried out preheating; Its two, elapsed time t
1Charging constantly increases the resistance of single limit voltage comparator 82 to electric capacity, but do not reach maximum,, its output still is H, and switch 83 still is in power Vcc instead on the lower side, K1, K2 open circuit, still only C2 regularly, it is less that single limit voltage comparator 86 set resistance fill time constant to electric capacity, output becomes L, and current switch 87 is connected the C of self-oscillation IC6
TEnd is Low ESR, and its frequency transition becomes lower; Its three, be t when the time
2, when singly the resistance of limit voltage comparator 82 was to electric capacity abundance maximum, output became L, single limit voltage comparator 86 outputs then become H, current switch 87 is output as 0 electric current, and switch 83 becomes the positively biased conducting, and K1, K2 connect, C1 also meets C2, self-oscillation IC6 frequencies go lower near lamp load LC resonance frequency, makes its resonance produce high-tension ignition, the fluorescent tube gas ionization punctures, lamp be activated light luminous.
Inverter input/output voltage relatively trigger 81 inserts the APFC4 output dc voltage, and access is through the negative pressure of high frequency detection output, during operate as normal, two voltage ratios are in balance, and its output approaches 0, at this moment, the voltage of lamp load current detector 88 outputs or overtemperature detector 89 output voltages are just in time fallen in the window voltage of dual-threshold voltage comparator 86 settings, it is output as high level H, and self-oscillation IC6 enters the low-frequency oscillation of stable state, the normal luminous lighting of lamp.
Abnormality appears in bad or open filament, short circuit, lamp tube air leaking when fluorescent tube 9 one end in contact, higher or the APFC4 output dc voltage inverter input/output voltage comparison trigger 81 that makes on the low side of inverter 7 high frequency voltage amplitudes is in imbalance state, at this moment single limit voltage comparator 83 output L saltus steps are H, and single limit voltage comparator 86 output H saltus steps are L, current switch 87 is that on-state or break-make replace the C of self-oscillation IC6
TEnd is Low ESR, and the IC6 failure of oscillation prevents inverter 7 power switch pipe overvoltages and damages, and plays a protective role.
After lamp failure or unusual eliminating, inverter input/output voltage comparison trigger 81 output voltages are in normal condition, can trigger and restart, and its step is still undertaken by frequency converting and preheating three rank soft starts.
Lamp load current detector 88, it is the electric current through bead magnetic circuit induction fluorescent tube 9, the diode peak detection, its output inserts dual-threshold voltage comparator 85, and it is very simple to have a circuit, detects sensitive high characteristics.
Specific implementation method
The utility model embodiment 1; it is provided with metal shell and suppresses power supply electromagnetic interference electromagnetic interface filter 2; power supply bridge heap rectification circuit 3; Active Power Factor Correction booster converter APFC4; self-oscillating driver IC6; MOSFET half-bridge or full-bridge inverter 7; tube load circuit 9 constitutes; self-oscillating driver IC6 also is provided with frequency converting and preheating can restart band abnormal protection control circuit 8; D.C. regulated power supply 5 for control circuit; the connected mode of this circuit of electronic ballast is to enter in grid alternating current source 1 to insert between the rectification circuit 3 to suppress power supply electromagnetic interference electromagnetic interface filter 2; 3 outputs of power supply bridge heap rectification circuit insert Active Power Factor Correction and press converter APFC4; D.C. regulated power supply 5 for control circuit draws the inductor high-frequency pulse voltage of pressing converter APFC4 from the active power factor correcting; through rectification; filtering; voltage stabilizing inserts self-oscillating driver IC6 respectively; frequency converting and preheating can restart the power end Vcc of band abnormal protection control circuit 8; the input that frequency converting and preheating can restart band abnormal protection control circuit 8 is connected to the output voltage that the source power factor correcting is pressed converter APFC4 respectively; MOSFET half-bridge or full-bridge inverting output voltage 7; lamp load current detector 88; overtemperature detector 89 output signals, its output meet the frequency control terminal C of self-oscillating driver IC6
T
Fig. 4 is that embodiment 1 frequency converting and preheating restarts abnormal protection control circuit figure; IN1 termination APFC output voltage; its voltage signal is through resistance R 1; R2; the base stage of VD2 to VT1; simultaneously; IN2 termination inverter output high-frequency signal is through detector diode VD1 to VT1; the input/output voltage that reaches inverter compares; VT1 output is through single limit voltage comparator A1; A2; current switch VT2 base stage; VD7 inserts the CT end of self-oscillation device IC; single limit voltage comparator A1; A2; input is respectively equipped with the RC charge-discharge circuit; its charge constant A1＞A2; vibration timing capacitor C4; equivalent switch VD5 is switched in C5 and frequency conversion; VD6 joins, and it drives the C that is connected on IC under the power Vcc reverse bias and by A1 output
TEnd, IN3 is the input of dual-threshold voltage comparator A3, A4, connects lamp load current detector and overtemperature detector output signal, its output inserts the C of self-oscillation device IC through current switch VT2 emitter-base bandgap grading, VD7
TEnd, single limit voltage comparator A1, A2 and dual-threshold voltage comparator A3, A4 input are connected to the reference voltage that R8, R9, R10 are formed by the power Vcc dividing potential drop.R11 is the R of oscillator IC among the figure
TThe end timing resistor, it and timing capacitor C4, C5 determine frequency of oscillation.
The two fluorescent tubes of present embodiment fluorescent-lamp ballast circuit configuration; the ballast shell adopts the aluminium alloy punching press to make with the two-stage electromagnetic interface filter the stronger inhibition vibration harmonic wave electromagnetic interference and the Electro Magnetic Compatibility EMC of conducted interference; the AC network supply voltage is in 85～275V scope; APFC pre-adjustment converter output dc voltage is stabilized in 400V; being adapted to global line voltage uses; input current total harmonic distortion THD＜10%; ballast circuit factor λ 〉=0.99; lamp current crest coefficient＜1.5; the ballast output power specification has 32W respectively; 36W; 58W; 110W; operating efficiency η 〉=more than 90%; self-oscillation device IC pre-heat frequency 68kHz; fluorescent tube frequency conversion 0.6～1S cathode preheating time; frequency conversion 0.3～0.5S transit time; the starting ignition of stable state resonance frequency 32kHz lamp is ignited luminous, the protection of the every abnormality of Test to Failure lamp load, and circuit can operate as normal.After the heat that the inverter power switch sends surpassed 85 ℃, the overtemperature detection signal cut off its output, and when temperature dropped to 50 ℃ of left and right sides, circuit was resumed work, and lamp will restart.
The utility model embodiment 2, the circuit engineering scheme is identical with embodiment 1, and different be that the frequency converting and preheating circuit adopts as shown in Figure 5, during power on circuitry, R2 ends it to the VT1 zero offset, the C of IC
TEnd is connected with C2 regularly with capacitor C 1 by R3, its frequency of oscillation is 75kHz, lower away from lamp load resonance frequency output voltage, lamp cathode is carried out preheating, at this moment power Vcc is through 1 pair of C1 charging of resistance R, through certain warm-up time, along with C1 electric charge abundance, VD1 is breakdown, the VT1 saturation conduction, equivalent switch K1 connects, and is short-circuit ground, and timing capacitor has only C1 to participate in work, the frequency of oscillation step-down is 38kHz, with lamp load LC frequency generation resonance, produce high pressure the lamp startup is lighted, finish lamp frequency converting and preheating soft start function.The H of IC among the figure
0, L
0Pin is the terminal of driving power inverter, and R4 is the load resistance of VT1.
The frequency converting and preheating electric capacity of the utility model embodiment 1 switches and adopts working method in parallel, embodiment 2 then adopts the mode of connecting, and as seen, frequency conversion work can have multiple mode.The utility model circuit design is reasonable, the collection frequency converting and preheating, restarts and protects multi-functional integratedly with abnormality detection, and every technical indicator reaches the high standard requirement, and adopts universal elements, and the cost cost is low, and bigger application prospect is arranged.
Claims (4)
1. a frequency converting and preheating can restart the electronic ballast for fluoresent lamp of being with abnormal protection; be provided with metal shell and suppress power supply electromagnetic interference electromagnetic interface filter; power supply bridge heap rectification circuit; Active Power Factor Correction booster converter APFC; self-oscillating driver IC; MOSFET half-bridge or full-bridge inverter; the tube load circuit constitutes; it is characterized in that: self-oscillating driver IC also is provided with frequency converting and preheating can restart band abnormal protection control circuit; D.C. regulated power supply for control circuit; the connected mode of this circuit of electronic ballast is to enter in the grid alternating current source to insert between the rectification circuit to suppress power supply electromagnetic interference electromagnetic interface filter; the output of power supply bridge heap rectification circuit inserts Active Power Factor Correction and presses converter APFC; D.C. regulated power supply for control circuit draws the inductor high-frequency pulse voltage of pressing converter APFC from the active power factor correcting; through rectification; filtering; voltage stabilizing inserts self-oscillating driver IC respectively; frequency converting and preheating can restart the power end Vcc of band abnormal protection control circuit; the input that frequency converting and preheating can restart band abnormal protection control circuit is connected to the output voltage that the source power factor correcting is pressed converter APFC respectively; MOSFET half-bridge or full-bridge inverter output voltage; the lamp load current detector; overtemperature detector output signal, its output meet the frequency control terminal C of self-oscillating driver IC
T
2. to can restart the electronic ballast for fluoresent lamp of being with abnormal protection by book 1 described a kind of frequency converting and preheating according to right; it is characterized in that: frequency converting and preheating can restart the band abnormity protection circuit; it is to compare trigger by the inverter input/output voltage; two single limit voltage comparators; frequency conversion electric capacity switches equivalent switch; dual-threshold voltage comparator; current switch; the lamp load current detector; overtemperature detector; reference voltage is formed; wherein, the inverter input/output voltage compares trigger; two single limit voltage comparators through serial; current switch inserts the frequency control terminal C of self-oscillating driver IC
T, simultaneously, single limit voltage comparator inserts reference voltage, and frequency conversion electric capacity switches equivalent switch one termination power, and the other end is connected between single limit voltage comparator of dual serial, also has an end to be attempted by the frequency control terminal C of self-oscillating driver IC
T, dual-threshold voltage comparator inserts lamp load current detector and overtemperature detector and reference voltage respectively, and its output inserts the frequency control terminal C of self-oscillating driver IC through current switch
T
3. to can restart the electronic ballast for fluoresent lamp of being with abnormal protection by book 1 described a kind of frequency converting and preheating according to right; it is characterized in that: the lamp load current detector; it is to pass a bead by the lead that connects fluorescent tube; be wound with step-up coil and through diode detection, RC filtering on this magnet ring, its output inserts dual-threshold voltage comparator.
4. to can restart the electronic ballast for fluoresent lamp of being with abnormal protection by book 1 described a kind of frequency converting and preheating according to right; it is characterized in that: overtemperature detector; it is that PN junction IC temperature sensor is set on inverter power switching tube or its radiator, and its output inserts dual-threshold voltage comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520115847 CN2845392Y (en) | 2005-10-29 | 2005-10-29 | Electronic fluorescent ballast with frequency converting pre-heating, re-starting and abnormal protecting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520115847 CN2845392Y (en) | 2005-10-29 | 2005-10-29 | Electronic fluorescent ballast with frequency converting pre-heating, re-starting and abnormal protecting |
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| Publication Number | Publication Date |
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| CN2845392Y true CN2845392Y (en) | 2006-12-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520115847 Expired - Fee Related CN2845392Y (en) | 2005-10-29 | 2005-10-29 | Electronic fluorescent ballast with frequency converting pre-heating, re-starting and abnormal protecting |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101472376A (en) * | 2007-12-29 | 2009-07-01 | 上海贝岭股份有限公司 | Electric ballast and control method for limiting firing current |
| CN101707841B (en) * | 2009-11-03 | 2013-09-04 | 海洋王照明科技股份有限公司 | Electronic ballast and fluorescent lamp device |
| CN103874309A (en) * | 2014-03-28 | 2014-06-18 | 溢阳（太仓）光电科技有限公司 | Novel xenon street lamp variable-frequency drive circuit |
-
2005
- 2005-10-29 CN CN 200520115847 patent/CN2845392Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101472376A (en) * | 2007-12-29 | 2009-07-01 | 上海贝岭股份有限公司 | Electric ballast and control method for limiting firing current |
| CN101472376B (en) * | 2007-12-29 | 2013-03-27 | 上海贝岭股份有限公司 | Electric ballast and control method for limiting firing current |
| CN101707841B (en) * | 2009-11-03 | 2013-09-04 | 海洋王照明科技股份有限公司 | Electronic ballast and fluorescent lamp device |
| CN103874309A (en) * | 2014-03-28 | 2014-06-18 | 溢阳（太仓）光电科技有限公司 | Novel xenon street lamp variable-frequency drive circuit |
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| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |