CN103025035B - Resonant capacitance adjustment element and the current preheating type electric stabilizer that is suitable for - Google Patents
Resonant capacitance adjustment element and the current preheating type electric stabilizer that is suitable for Download PDFInfo
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- CN103025035B CN103025035B CN201110287911.3A CN201110287911A CN103025035B CN 103025035 B CN103025035 B CN 103025035B CN 201110287911 A CN201110287911 A CN 201110287911A CN 103025035 B CN103025035 B CN 103025035B
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- 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
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Abstract
The invention discloses a kind of resonant capacitance adjustment element and the current preheating type electric stabilizer that is suitable for, to drive the fluorescent tube of tool filament, this current preheating type electric stabilizer comprises: AC-to-DC change-over circuit, is converted to high-voltage dc voltage by AC-input voltage; Control unit; Boost voltage produces circuit; And inverter circuit, high-voltage dc voltage is converted to ac output voltage and export resonance electric current and a heater current to fluorescent tube, inverter circuit comprises: resonant circuit provides the energy of fluorescent tube preheating; And resonant capacitance Circuit tuning, be connected to resonant circuit and detecting element, by this detecting element, resonant capacitance Circuit tuning judges whether inverter circuit comes into operation, and the time of delay after inverter circuit comes into operation is by corresponding for two of resonant capacitance Circuit tuning high-voltage switch gear ends conducting or open circuit, to change the equivalent tank capacitance of resonant circuit.
Description
Technical field
The present invention relates to a kind of electric stabilizer, and in particular to a kind of resonant capacitance adjustment element and the current preheating type electric stabilizer that is suitable for, it can control the cross-pressure at the filament two ends of driven fluorescent tube.
Background technology
Illumination is the primary demand of the mankind, in recent years along with global economy and trade and business activity frequent, and the raising of house quality of the life, electric consumption on lighting also up rises, and overall lighting demand electric power is very considerable, and the most widely used lamp body is a kind of low-pressure gaseous discharge lamp at present, also fluorescent lamp or fluorescent lamp is claimed, therefore, if the energy-conservation of this kind of low-pressure gaseous discharge lamp can be devoted to, when saving considerable electric energy.In addition, along with the epoch develop and the lifting of social life level, generally common illumination driving circuit applies and uses, and the electric stabilizer that the illumination of low EMI, high efficiency, High Power Factor, flicker free and lightweight, high-quality, power saving are saved becomes the main flow of lighting apparatus in recent years.
Existing electric stabilizer includes current preheating type electric stabilizer and voltage preheating type electric stabilizer.The startup sequential that traditional current preheating type electric stabilizer can provide fluorescent lamp good, by controlling wafer, such as ST L6574, can provide fluorescent lamp two sections of operating frequencies, when this operating frequency is in relative high frequency state, in order to the filament in preheat fluorescent lamp, wherein, the energy of preheat fluorescent lamp can be provided by the resonant circuit in electric stabilizer.And when this operating frequency is in rather low-frequency state, then in order to stably to provide the operating current needed for fluorescent lamp.
Current preheating type electric stabilizer after fluorescent lamp normally works namely continue output one stable determine electric current to maintain the brightness of fluorescent lamp, but, when flowing through the filament in fluorescent lamp when this operating current, a cross-pressure pressure drop can be formed in filament two ends, therefore current preheating type stabilizer is when being used for the general fluorescent lamp of low filament impedances (such as 2 ~ 5 ohm), the cross-pressure at filament two ends can lower than a threshold voltage, and such as 4V (volt) is more not remarkable on the impact of burn-out life.But when current preheating type stabilizer is used for the high efficiency fluorescent lamp of high filament impedances (such as 8 ~ 15 ohm), because filament is high impedance, so time filament two ends cross-pressure (such as 16V) can higher than this threshold voltage, so, the life-span of unnecessary energy dissipation and minimizing fluorescent lamp will be caused, even cause high efficiency fluorescent lamp to burn.
Therefore, how to develop a kind of disappearance solving existing current preheating type electric stabilizer and fluorescent lifetime can be caused to reduce or burn, real is problem in the urgent need to address at present.
Summary of the invention
The object of the present invention is to provide a kind of resonant capacitance adjust element and the current preheating type electric stabilizer that is suitable for, it changes the equivalent tank capacitance of resonant circuit by resonant capacitance Circuit tuning (element), to reach the object of the current value of adjustment heater current before and after fluorescent tube preheating completes and lights, in order to do the cross-pressure at the filament two ends that can change in many group fluorescent tubes, to increase the useful life of fluorescent lamp, therefore current preheating type electric stabilizer of the present invention can be applicable to the general fluorescent lamp of low filament impedances and the high efficiency fluorescent lamp of high filament impedances simultaneously.Resonant capacitance adjustment element (circuit) provided by the invention owing to can operate normally under the environment of high frequency, therefore the current preheating type electric stabilizer of high frequency is applicable to, more can utilize its lag characteristic that the equivalent tank capacitance of the resonant circuit of current preheating type electric stabilizer is changed after fluorescent lamp lighting (ignition), and the current value of heater current (lamp filament current) and the cross-pressure at filament two ends are reduced.
For reaching above-mentioned purpose, of the present invention one comparatively broad embodiment for providing a kind of current preheating type electric stabilizer, drive at least one group of fluorescent tube, this current preheating type electric stabilizer comprises: AC-DC change-over circuit, AC-input voltage is converted to high-voltage dc voltage, and it is connected to DC bus and exports high-voltage dc voltage; Control unit, controls the running of current preheating type electric stabilizer; Boost voltage produces circuit, is generation boost voltage; And inverter circuit, be connected with DC bus, for high-voltage dc voltage is converted to ac output voltage and export resonance electric current and heater current to this group fluorescent tube, inverter circuit comprises: resonant circuit, be connected to this group fluorescent tube, energy required during to provide this group fluorescent tube preheating, and comprise resonant inductance and multiple resonant capacitance; And resonant capacitance Circuit tuning, be connected to resonant circuit and a detecting element, by this detecting element, resonant capacitance Circuit tuning system judges whether inverter circuit comes into operation, and the time of delay after inverter circuit comes into operation is by corresponding for two of resonant capacitance Circuit tuning high-voltage switch gear ends conducting or open circuit, to change the equivalent tank capacitance of resonant circuit, in order to do the cross-pressure at the filament two ends changed in this group fluorescent tube.
For reaching another object above-mentioned, of the present invention one comparatively broad embodiment for provide a kind of resonant capacitance adjust element, be the electronic component of tool four pin, be applied to the inverter circuit of current preheating type electric stabilizer, and comprise: the first switch element; Control voltage produces circuit, is connected with detecting element by two test sides of resonant capacitance adjustment element, its utilize detecting element to judge whether inverter circuit comes into operation, and produce the first direct voltage of corresponding states; And delay circuit, the control end and the control voltage that are connected to the first switch element produce circuit, the state of foundation the first direct voltage is after a time of delay of postponing, produce the second direct voltage of corresponding states, to control the first switching elements conductive or open circuit, and resonant capacitance is made to adjust the conducting of two high-voltage switch gear ends or the open circuit of element.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the current preheating type electric stabilizer of present pre-ferred embodiments.
Fig. 2 is the time diagram of the voltage of current preheating type electric stabilizer of the present invention, electric current and state.
Fig. 3 is the circuit diagram of the current preheating type electric stabilizer of another preferred embodiment of the present invention.
Fig. 4 is the circuit diagram of the current preheating type electric stabilizer of another preferred embodiment of the present invention.
Wherein, description of reference numerals is as follows:
Current preheating type electric stabilizer: 1,1B, 1C
Fluorescent tube (group): 2,2B
Filament: 21
AC-DC change-over circuit: 10
EMI Filtering unit: 100
First rectification circuit: 101
Circuit of power factor correction: 102
Power factor correction control circuit: 1020
Inverter circuit: 11,11B, 11C
Preheat circuit: 110
Resonant circuit: 111,111B
Resonant capacitance Circuit tuning: 112
Control voltage produces circuit: 1120
Full bridge rectifier: 1121
Clamp protection circuits: 1122
Delay circuit: 1123
Inverter control circuit: 113
Power switch circuit: 114
Bleeder circuit: 115
Protective circuit: 116
Boost voltage produces circuit: 12
DC bus: 13
Control unit: 14
AC-input voltage: V
in
High-voltage dc voltage: V
h
AC input current: I
in
Ac output voltage: V
o
First direct voltage: V
dc1
Second direct voltage: V
dc2
Boost voltage: V
cc
Demodulating voltage: V
pwm
Filament voltage: V
d
Resonance current: I
1
Lamp current: I
2
Heater current: I
3
Output frequency: f
o
First ~ second frequency value: f
1~ f
2
Resonant inductance: Lr
First inductance: L
1
The first ~ the second auxiliary winding: Na ~ Nb
Resonance winding: Nr
Equivalent tank capacitance: C
t
First resonant capacitance: C
r1, C
ra
Second resonant capacitance: C
r2, C
rb
Half-bridge capacitance: C
h
First diode: D
1
Second diode: D
2
3rd diode: D
3
First protection diode: D
b1
Second protection diode: D
b2
First resistance: R
1
Second resistance: R
2
3rd resistance: R
3
4th resistance: R
4
Detection resistance: Rs
First switch element: Q
1
The control end of the first switch element: Q
1a
The current input terminal of the first switch element: Q
1b
The current output terminal Q of the first switch element
1c
Second switch element: Q
2
The control end of second switch element: Q
2a
3rd switch element: Q
3
4th switch element: Q
4
First electric capacity: C
1
Second electric capacity: C
2
3rd electric capacity: C
3
First derided capacitors: C
b1
Second derided capacitors: C
b2
First Zener diode: Z
1
Second Zener diode: Z
2
3rd Zener diode: Z
3
First end (direct current anode): a
Second end (direct current negative terminal): b
3rd end (first exchanges end): c
4th end (second exchanges end): d
First ~ four time: t
1~ t
4
Warm-up time is interval: T
pre
Lighting time interval: T
ign
Time of delay: T
d
Thermistor (PTC): R
h
Node: A
Embodiment
Some exemplary embodiments embodying feature & benefits of the present invention describe in detail in the explanation of back segment.Be understood that the present invention can have various changes in different examples, it neither departs from the scope of the present invention, and explanation wherein and graphic in itself when the use explained, and be not used to limit the present invention.
Refer to Fig. 1, it is the circuit diagram of the current preheating type electric stabilizer of present pre-ferred embodiments.As shown in Figure 1, current preheating type electric stabilizer 1 is connected with multiple (group) fluorescent tube 2, in this many groups fluorescent tube 2, there is at least one filament 21, and current preheating type electric stabilizer 1 comprises AC-DC change-over circuit 10, inverter circuit 11, boost voltage generation circuit 12, control unit 14 and bus capacitance C
b.In the present embodiment, this light tube group 2 is that two (multiple) gas discharge lamp tubes are connected in series composition, but not as limit, also can be connected in parallel by two (multiple) gas discharge lamp tubes and form.
AC-DC change-over circuit 10 is in order to by an AC-input voltage V
inbe converted to a high-voltage dc voltage V
h, it has an input side and an outlet side, and this input side is in order to receive this AC-input voltage V
in, and this outlet side is connected to a DC bus 13 (DC bus) and exports this high-voltage dc voltage V
h, such as 450V.The input side of inverter circuit 11 is connected with DC bus 13, and by this high-voltage dc voltage V
hbe converted to an ac output voltage V
oand export a resonance current I
1and heater current I
3to this many groups fluorescent tube 2, wherein this resonance current I
1be a lamp current I
2and heater current I
3summation, i.e. resonance current I
1=lamp current I
2+ heater current I
3.
In the present embodiment, inverter circuit 11 comprises preheat circuit 110, resonant circuit 111 and a resonant capacitance Circuit tuning 112, wherein, preheat circuit 110 is connected with the filament 21 of the series side of this many groups fluorescent tube 2, and the filament 21 in order to the series side to this many groups fluorescent tube 2 carries out preheating.Resonant circuit 111 in order to provide this many groups fluorescent tube 2 preheating, lighting and luminous time required energy, in this embodiment, resonant circuit 111 comprises a resonant inductance Lr, one first resonant capacitance C
r1and one second resonant capacitance C
r2, resonant inductance Lr is connected to one of them filament 21, first resonant capacitance C of switching circuit 114 and fluorescent tube 2
r1with the second resonant capacitance C
r2be connected in series between two filaments of fluorescent tube 2, wherein the first resonant capacitance C
r1capacitance be greater than the second resonant capacitance C
r2capacitance.Two high-voltage switch gear ends of resonant capacitance Circuit tuning 112 are connected with this resonant circuit 111, and two of resonant capacitance Circuit tuning 112 test sides are connected with a detecting element, such as be connected with the first auxiliary winding Na (winding) of resonant inductance Lr, and comprise control voltage generation circuit 1120, delay circuit 1123, full bridge rectifier 1121 and an one first switch element Q
1, wherein this resonant capacitance Circuit tuning 112 utilizes this first switch element Q
1time delay ground conducting or open circuit, to change the equivalent tank capacitance C of this resonant circuit 111 be connected with two of resonant capacitance Circuit tuning 112 high-voltage switch gear ends
t.Boost voltage produces circuit 12 in order to produce a boost voltage V
cc, such as 5V, and the power factor correction control circuit 1020 (PFC control circuit) of control unit 14 is provided and inverter control circuit 113 operates time required electric energy.Bus capacitance C
bbe connected with DC bus 13, in order to filtering high-voltage dc voltage V
hhigh-frequency noise.
According to conception of the present invention, by the resonant capacitance circuit (C of resonant circuit 111
r1, C
r2) be connected in series with filament 21, and the second resonant capacitance C of two of resonant capacitance Circuit tuning 112 switch terminals and resonant circuit 111
r2be connected in parallel, after fluorescent tube 2 is lit, inverter circuit 11 by the running of resonant capacitance Circuit tuning 112 to change the equivalent tank capacitance C of this resonant circuit 111
t, this heater current I can be made
3current value change, namely the fictitious power amount (reactivepower) of for a change flowing through lamps silk 21 and resonant circuit 111, so then can change cross-pressure (the filament voltage V at these filament 21 two ends in this many groups fluorescent tube 2
d) amplitude (amplitude).
Referring again to Fig. 1, AC-DC power supply change-over circuit 10 comprises EMI Filtering unit 100, first rectification circuit 101 and circuit of power factor correction 102, and wherein EMI Filtering unit 100 is in order to receive AC-input voltage V
in, the AC of the first rectification circuit 101 is connected with EMI Filtering unit 100, and the DC side of the first rectification circuit 101 is connected with the input side of circuit of power factor correction 102, and the outlet side of circuit of power factor correction 102 is connected with DC bus 13.
In this embodiment, EMI Filtering unit 100 framework is in the high-frequency noise of obstruct current preheating type electric stabilizer 1 itself and from AC-input voltage V
inexternal noise, produce to avoid the situation of interactive interference.During running, AC power rectification is first full-wave direct current power supply by the first rectification circuit 101 by AC-DC power supply change-over circuit 10, then by circuit of power factor correction 102 by second switch element Q
2conducting or cut-off, be high-voltage dc voltage V by full-wave direct current power boost
h.Circuit of power factor correction 102 comprises the first inductance L
1, the 3rd diode D
3, detect resistance Rs and second switch element Q
2, wherein, the first inductance L
1one end be connected with the anode of the DC side of the first rectification circuit 101, the other end and the 3rd diode D
3anode tap (anode) connect, and the 3rd diode D
3cathode terminal (cathode) be connected with DC bus 13, second switch element Q
2with detection resistance R
s, the first inductance L
1and the 3rd diode D
3connect.Power factor correction control circuit 1020 and second switch element Q
2control end Q
2aconnect, and by controlling second switch element Q
2conducting or cut-off, make AC input current I
incURRENT DISTRIBUTION be similar to AC-input voltage V
insinusoidal waveform, to increase power factor.
In this embodiment, inverter circuit 11 also comprises power switch circuit 114 and a bleeder circuit 115, wherein inverter control circuit 113 produces circuit 12 with power switch circuit 114 and boost voltage and is connected, operate in order to control power switch circuit 114, make the series connection end generation one demodulating voltage V of power switch circuit 114
pwm.Bleeder circuit 115 is connected to DC bus 13, in order to produce a branch pressure voltage (V
h/ 2).Power switch circuit 114 comprises the 3rd switch element Q
3and the 4th switch element Q
4, the 3rd switch element Q
3and the 4th switch element Q
4be connected in series, bleeder circuit 115 comprises the first derided capacitors C
b1and the second derided capacitors C
b2, the first derided capacitors C
b1and the second derided capacitors C
b2be connected in series, the series connection end of power switch circuit 114 and the end of connecting of bleeder circuit 115 are connected to resonant circuit 111 and this many groups fluorescent tube 2.Inverter circuit 11 is by the 3rd switch element Q
3and the 4th switch element Q
4alternatively conducting or cut-off, and by high-voltage dc voltage V
hbe converted to the ac output voltage V of high frequency
o.In the present embodiment, preheat circuit 110 can be one and assists winding N with second of the same magnetic core of resonant inductance Lr (Core) structure
band the 4th electric capacity C
4, and be mutually connected in series with the filament 21 of the series side of multiple fluorescent tube 2, but not as limit, the filament 21 in order to the series side to multiple fluorescent tube 2 carries out preheating.
In the present embodiment, the circuit connecting relation in resonant capacitance Circuit tuning 112 is sequentially control voltage and produces circuit 1120, delay circuit 1123, first switch element Q
1and full bridge rectifier 1121, wherein, control voltage produces the first auxiliary winding N of circuit 1120 by resonant inductance Lr
a(detecting element) judges whether inverter circuit 11 comes into operation, and produces the first direct voltage V of corresponding states (current potential)
dc1.Delay circuit 1123 is according to the first direct voltage V
dc1state (current potential) postpone one time of delay T
dafter, produce the second direct voltage V of corresponding states (current potential)
dc2, to control the first switch element Q
1whether conducting.
In the present embodiment, control voltage produces circuit 1120 and comprises the first electric capacity C
1, the second electric capacity C
2, the first resistance R
1, the second resistance R
2and the first Zener diode Z
1, delay circuit 1123 comprises the second diode D
2, the 3rd electric capacity C
3, the 3rd resistance R
3and the 4th resistance R
4, wherein, the first auxiliary winding N
aone end and the first electric capacity C
1one end and first node A connect, the first electric capacity C
1the other end and the first resistance R
1one end connect, the first resistance R
1the other end and the first diode D
1anode tap and the first Zener diode Z
1cathode terminal connect, the first Zener diode Z
1anode tap be connected to first node A, the first diode D
1cathode terminal and the second electric capacity C
2one end, the second resistance R
2one end and the 3rd electric capacity C
3one end connect, the 3rd electric capacity C
3the other end, the second resistance R
2the other end, the second diode D
2anode tap and the 4th resistance R
4one end be connected to first node A, the second diode D
2cathode terminal and the 3rd electric capacity C
3the other end and the 3rd resistance R
3one end connect, the 3rd resistance R
3the other end and the 4th resistance R
4the other end connect.
In this embodiment, the first switch element Q
1can be but be not limited to metal-oxide-semifield-effect electric crystal (MOSFET), the first switch element Q
1control end Q
1awith the 3rd resistance R
3the other end and the 4th resistance R
4the other end connect, the first switch element Q
1current input terminal Q
1bbe connected with the first end a (direct current anode) of full bridge rectifier 1121, the first switch element Q
1current output terminal Q
1cbe connected with the second end b (direct current negative terminal) of full bridge rectifier 1121, the 3rd end c and the 4th end d (AC two ends) of full bridge rectifier 1121 are connected to the second resonant capacitance C respectively
r2two ends, namely with the second resonant capacitance C
r2be connected in parallel.
Refer to Fig. 2 and coordinate Fig. 1, wherein Fig. 2 is the time diagram of the voltage of current preheating type electric stabilizer of the present invention, electric current and state.As shown in Figure 2, AC-input voltage V is received at current preheating type electric stabilizer 1
inand start the very first time t after start
1, control unit 14, by controlling the running of power switch circuit 114, makes inverter circuit 11 start output frequency value (output frequency f
o) higher first frequency value f
1the ac output voltage V of (such as 65k Hz)
oand resonance current I
1, and start to carry out preheating, because now fluorescent tube 2 is not yet lighted, therefore without lamp current I to many group fluorescent tubes 2
2, then resonance current I
1filament 21 can be flowed through and be passed to the first resonant capacitance C
r1, so time resonance current I
1equal heater current I
3.In order to there be the heater current I of larger current value
3to filament 21 preheating effectively, at interval T warm-up time
pre, can corresponding conducting, i.e. the first switch element Q between two high-voltage switch gear ends of resonant capacitance Circuit tuning 112
1conducting, and make equivalent tank capacitance C
tbe the first resonant capacitance C
r1comparatively bulky capacitor value (C
t=C
r1).
At very first time t
1, the first auxiliary winding N
a(detecting element) responds to the resonance current I of this resonance winding Nr
1and the electric energy produced, and via the first electric capacity C
1and the first resistance R
1be passed to the first diode D
2cathode terminal, to produce the first direct voltage V of enabled status (high potential)
dc1, this enabled status (high potential) represents that inverter circuit 11 comes into operation.Now, the first direct voltage V of enabled status (high potential)
dc1start the 5th electric capacity C
5charging, due to circuit running initial stage the 5th electric capacity C
5near short circuit, i.e. the 5th electric capacity C
5magnitude of voltage be 0V, therefore the first direct voltage V
dc1by the 3rd resistance R
3and the 4th resistance R
4dividing potential drop and the second direct voltage V obtained
dc2(V
dc2> V
t) disabled state (electronegative potential) can not be changed into accordingly, the second direct voltage V at once
dc2magnitude of voltage can be maintained and be greater than the first switch conduction voltage value V
thigh potential (enabled status), make the first switch element Q
1conducting, so can make heater current I
3without the second resonant capacitance C
r2, i.e. bypass second resonant capacitance C
r2.Now, heater current I
3flow through the first resonant capacitance C
r1after namely flow into full bridge rectifier 1121 by the 3rd end c, then through the first switch Q of conducting after being flowed out by first end a
1and second end b flow into full bridge rectifier 1121, then flow out to the other end of fluorescent tube 2 to form primary Ioops by the 4th end d, this is the positive half cycle start of electric current, and negative half period start is heater current I
3full bridge rectifier 1121 is flowed into by the 4th end d, and through the first switch Q of conducting after being flowed out by first end a
1and second end b flow into full bridge rectifier 1121, then to be flowed out by the 3rd end c, then through the first resonant capacitance C
r1one end of rear inflow fluorescent tube 2.
At the second time t
2to the 3rd time t
3lighting time interval T
ignin, control unit 14, by controlling the running of power switch circuit 114, makes ac output voltage V
oand resonance current I
1frequency values f
oby the first frequency value f of higher-frequency
1(such as 65k Hz) gradually reduces to the second frequency value f compared with low frequency
2(such as 40k Hz), makes resonant circuit 111 at the 3rd time t
3operate the second frequency value f in higher-frequency
2and there is high-gain (gain), and then produce the ac output voltage V of higher voltage value (amplitude)
ofluorescent tube 2 is lighted.
After the preheating of fluorescent tube 2 and lighting program complete, the first direct voltage V
dc1can continue the 5th electric capacity C
5charging makes its magnitude of voltage rise, now, and the second direct voltage V
dc2although magnitude of voltage can decline accordingly, the second direct voltage V
dc2(V
dc2> V
t) enabled status (high potential) can be maintained, until the 4th time t
4, the second direct voltage V
dc2magnitude of voltage just can be less than the first switch conduction voltage value V
t(V
dc2< V
t), namely change into disabled state (electronegative potential), energy is no longer passed to the first switch element Q
1control end Q
1a, therefore the first switch element Q
1open circuit, resonant capacitance Circuit tuning 112 stops the second resonant capacitance C
r2carry out bypass.Now heater current I
3flow through the first resonant capacitance C
r1and the second resonant capacitance C
r2after flow to the other end of fluorescent tube 2 again and form primary Ioops, but now the annexation of equivalent tank electric capacity is the first resonant capacitance C
r1with the second resonant capacitance C
r2be connected in series, and form resonant inductance Lr, the first resonant capacitance C
r1and the second resonant capacitance C
r2for being connected in series relation, therefore equivalent tank capacitance C
tbe less than the first resonant capacitance C
r1(C
t< C
r1), so can make heater current I
3current value reduce, and then the cross-pressure at filament 21 two ends is reduced, lamp tube service life increase, and reduces the waste of energy, when being applied to the high efficiency fluorescent lamp of high filament impedances, can also prevent high efficiency fluorescent lamp from burning.Owing to flowing through the heater current I of filament 21
3for fictitious power, lamp current I can not be affected
2current value size, so lamp current I
2current value can maintain fixing current value in fact.
Generally speaking, control voltage produces circuit 1120 at very first time t
1by the first auxiliary winding N
a(detecting element) judges that inverter circuit 11 comes into operation, and produces the first direct voltage V of corresponding enabled status (high potential)
dc1time, delay circuit 1123 correspondingly immediately can not change the second direct voltage V
dc2enabled status (high potential), but at T time of delay
dafter the 4th time t
4, just correspondence changes into the second direct voltage V of disabled state (electronegative potential)
dc2, to control the first switch element Q
1open circuit, makes heater current I
3and filament voltage V
dreduce.Due to T time of delay
dbe greater than interval T (or equaling) warm-up time
preand lighting time interval T
ignsummation (T
d> T
pre+ T
d), so, at interval T warm-up time
preand lighting time interval T
ign, the equivalent tank capacitance C of resonant circuit 111
t(C
t=C
r1) higher, inverter circuit 11 has preferably operating characteristics, to complete and after lighting, equivalent tank capacitance C at the preheating program of fluorescent tube 2 meanwhile
t(C
t< C
r1) lower, make heater current I
3and filament voltage V
damplitude lower.In some embodiments, resonant capacitance Circuit tuning 112 can also use semiconductor fabrication techniques to be made into the resonant capacitance adjustment element of four pin (pin), it comprises two test sides and two high-voltage switch gear ends, and be connected to detecting element and resonant circuit, to reduce component number when current preheating type electric stabilizer realizes and volume.
In the present embodiment, resonant capacitance Circuit tuning 112 uses the first switch element Q of lower operation frequency
1and full bridge rectifier 1121 realizes the switching characteristic of two switch terminals, therefore the first switch element Q
1can normally conducting and cut-off when being applied to the inverter circuit 11 of higher frequency values (such as more than 40k Hz).If when resonant capacitance Circuit tuning 112 is applied to the inverter circuit 11 of lower frequency value, the first unidirectional switch element Q
1and full bridge rectifier 1121 can be replaced by bilateral switching element (not shown), such as three-pole AC switch (T
rIAC), the wherein control end of bilateral switching element (not shown) and output (i.e. the 3rd resistance R of delay circuit 1123
3and the 4th resistance R
4series side) connect, and two of bilateral switching element switch terminals are two switch terminals of resonant capacitance Circuit tuning 112.
Referring again to Fig. 1, in this embodiment, inverter circuit 11 also comprises a protective circuit 116, in order to when fluorescent tube 2 fault, and protective current preheating type electric stabilizer 1.Protective circuit 116 comprises the first protection diode D
b1and second protects diode D
b2, it is connected respectively the first derided capacitors C in bleeder circuit 115
b1and the second derided capacitors C
b2, when fluorescent tube 2 fault, at ac output voltage V
opositive-negative half-cycle interim, the electric discharge of fluorescent tube 2 is asymmetric, such as only positive half period electric discharge, when not connecting protective circuit 116, the first derided capacitors C may be caused
b1or the second derided capacitors C
b2magnitude of voltage one of them is too high, such as, higher than high-voltage dc voltage V
hmagnitude of voltage, on the contrary, when have connect protective circuit 116, as such as the second derided capacitors C
b2magnitude of voltage higher than high-voltage dc voltage V
hmagnitude of voltage time, correspondence is connected to the second derided capacitors C
b2the second protection diode D
b2meeting conducting, makes the second derided capacitors C
b2charging cannot be continued, avoid the second derided capacitors C
b2magnitude of voltage too high and cause the first derided capacitors C
b1or the second derided capacitors C
b2damage.
In this embodiment, resonant capacitance Circuit tuning 112 also comprises a clamp protection circuits 1122, and is connected to the first switch element Q
1two switch terminals (Q
1c, Q
1c), it is by one second Zener diode Z
2and one the 3rd Zener diode Z
3be connected in series and form, with framework in protection first switch element Q
1, the high voltage avoiding the moment when fluorescent tube 2 preheating completes to produce damages the first switch element Q
1.
In this embodiment, inverter circuit 11 is also connected in parallel a thermistor (PTC) R between two of resonant capacitance Circuit tuning 112 switch terminals
h, just come into operation the initial stage (at very first time t at current preheating type electric stabilizer 1
1before), due to the first switch element Q
1that changes into conducting by open circuit needs blink, utilizes low temperature (such as 25 DEG C) and the less thermistor R of resistance value
hthe first switch element Q can be replaced momently
1to the second resonant capacitance C
r2bypass characteristic, make equivalent tank capacitance C
tbe the first resonant capacitance C
r1comparatively bulky capacitor value (C
t=C
r1), and by the heater current I of larger current value
3to filament 21 preheating, prevent fluorescent tube 2 at the less equivalent tank capacitance C of the cause not completing preheating simultaneously
tand of short duration flicker.After fluorescent tube 2 is lighted, due to thermistor R
hfor high temperature (such as 100 DEG C) and larger resistance value states, i.e. approximate open-circuit condition, makes it not have a bypass characteristic, so do not affect the characteristic of resonant circuit 111.
Refer to Fig. 3 and coordinate Fig. 1 and Fig. 2, wherein Fig. 3 is the circuit diagram of the current preheating type electric stabilizer of another preferred embodiment of the present invention.Light tube group 2B and the resonant circuit 111B of Fig. 3 are different from Fig. 1, and in the present embodiment, light tube group 2B realizes with single fluorescent tube, two high-voltage switch gear ends of resonant capacitance Circuit tuning 112 and the second resonant capacitance C
rbbe connected in series, resonant circuit 111B passes through conducting or the open circuit of two high-voltage switch gear ends of resonant capacitance Circuit tuning 112, makes the first resonant capacitance C
rawith the second resonant capacitance C
rboptionally be connected in parallel between two filaments 21 of light tube group 2B.Similarly, at interval T warm-up time
preand lighting time interval T
ign, can corresponding conducting, i.e. the first switch element Q between two high-voltage switch gear ends of resonant capacitance Circuit tuning 112
1conducting, makes equivalent tank capacitance C
tfor comparatively bulky capacitor value, i.e. equivalent tank capacitance C
tbe the first resonant capacitance C
rawith the second resonant capacitance C
rbthe summation of capacitance.At T time of delay
dafter the 4th time t
4, fluorescent tube preheating completes and lights, and correspondingly can open a way, make equivalent tank capacitance C between two high-voltage switch gear ends of resonant capacitance Circuit tuning 112
tfor small electric capacitance (C
t=C
ra), i.e. equivalent tank capacitance C
tbe the first resonant capacitance C
racapacitance.Wherein, if the first resonant capacitance C
racapacitance be less than the second resonant capacitance C
rbcapacitance time, current preheating type electric stabilizer 1B can have better operating characteristics.
Refer to Fig. 4 and coordinate Fig. 1 ~ 3, wherein Fig. 4 is the circuit diagram of the current preheating type electric stabilizer of another preferred embodiment of the present invention.The inverter circuit 11C of Fig. 4 is different from Fig. 3, and in the present embodiment, because the responsibility cycle (duty cycle) when power switch circuit 114 operates is 50%, therefore the bleeder circuit 115 of Fig. 3 to be simplified (or equivalence) be a half-bridge capacitance C
h, and this half-bridge capacitance C
hbe connected in series with resonant circuit 111B, and operation principles is same as above, repeats no more in this.
In sum, current preheating type electric stabilizer of the present invention regulates the equivalent tank capacitance in resonant circuit by a resonant capacitance Circuit tuning (element), making equivalent tank capacitance before and after fluorescent tube preheating completes and lights is different and suitable capacitance, so can have larger heater current in fluorescent tube preheating and when lighting, simultaneously at fluorescent tube preheating and the current value of rear reduction heater current lighted, to reach the object (lower than 4V) of the cross-pressure reducing filament two ends, energy dissipation and prolonging service life of lamp tube can be avoided thus, therefore current preheating type electric stabilizer of the present invention can be applicable to the general fluorescent lamp of low filament impedances and the high efficiency fluorescent lamp of high filament impedances simultaneously.Resonant capacitance adjustment element (circuit) provided by the invention owing to can operate normally under the environment of high frequency, therefore the current preheating type electric stabilizer of high frequency is applicable to, also can utilize its lag characteristic that the equivalent tank capacitance of the resonant circuit of current preheating type electric stabilizer is changed after fluorescent lamp lighting, and make the current value of heater current and the cross-pressure at filament two ends reduce (lower than 4V).
The present invention can be appointed by person familiar with the technology and executes craftsman and to think and for modifying as all, so neither de-if attached claim institute is for Protector.
Claims (19)
1. a current preheating type electric stabilizer, drives at least one group of fluorescent tube, it is characterized in that, this current preheating type electric stabilizer comprises:
One AC-DC change-over circuit, be that an AC-input voltage is converted to a high-voltage dc voltage, it is connected to a DC bus and exports this high-voltage dc voltage;
One control unit, controls the running of this current preheating type electric stabilizer;
One boost voltage produces circuit, produces a boost voltage; And
One inverter circuit, is connected with this DC bus, and for this high-voltage dc voltage being converted to an ac output voltage and exporting a resonance current and a heater current to this group fluorescent tube, this inverter circuit comprises:
One resonant circuit, is connected to this group fluorescent tube, energy required during to provide this group fluorescent tube preheating, and comprises a resonant inductance and multiple resonant capacitance; And
One resonant capacitance Circuit tuning, is connected to this resonant circuit and a detecting element, comprises:
One first switch element;
One control voltage produces circuit, is connected, judges whether this inverter circuit comes into operation by this detecting element, and produce one first direct voltage of corresponding states with this detecting element; And
One delay circuit, the control end and this control voltage that are connected to this first switch element produce circuit, according to the state of this first direct voltage after a time of delay of postponing, produce one second direct voltage of corresponding states, to control the whether conducting of this first switch element, to change the equivalent tank capacitance of this resonant circuit, to change the cross-pressure at the filament two ends in this group fluorescent tube.
2. current preheating type electric stabilizer as claimed in claim 1, it is characterized in that, this AC-DC change-over circuit comprises:
One EMI Filtering unit;
One first rectification circuit, is connected with this EMI Filtering unit; And
One circuit of power factor correction, is connected to this first rectification circuit and this DC bus.
3. current preheating type electric stabilizer as claimed in claim 1, it is characterized in that, this inverter circuit also comprises a bleeder circuit, is connected to this DC bus, to produce a branch pressure voltage, this bleeder circuit comprises one first derided capacitors and one second derided capacitors that are connected in series.
4. current preheating type electric stabilizer as claimed in claim 3; it is characterized in that; this inverter circuit also comprises a protective circuit; one first protection diode and the one second protection diode of this protective circuit are connected to this first derided capacitors and this second derided capacitors, to prevent the magnitude of voltage of this first derided capacitors and this second derided capacitors too high.
5. current preheating type electric stabilizer as claimed in claim 2, it is characterized in that, this control unit comprises: a power factor correction control circuit and an inverter control circuit, controls this circuit of power factor correction and the running of this inverter circuit respectively.
6. current preheating type electric stabilizer as claimed in claim 1, it is characterized in that, this first switch element is bilateral switching element or unidirectional switch elements.
7. current preheating type electric stabilizer as claimed in claim 1, it is characterized in that, this first switch element is unidirectional switch elements, and this resonant capacitance Circuit tuning also comprises a full bridge rectifier, two of this full bridge rectifier exchange two high-voltage switch gear ends that end is connected to this resonant capacitance Circuit tuning, and two DC terminal of this full bridge rectifier are connected with two switch terminals of this first switch element.
8. current preheating type electric stabilizer as claimed in claim 7; it is characterized in that; this resonant capacitance Circuit tuning also comprises a clamp protection circuits; be connected to two switch terminals of this first switch element; framework is in this first switch element of protection, and this resonant capacitance Circuit tuning comprises at least one Zener diode.
9. current preheating type electric stabilizer as claimed in claim 1, it is characterized in that, this control voltage produces circuit and comprises: one first electric capacity, one second electric capacity, one first resistance, one second resistance and one first Zener diode, one end and a first node of this detecting element and this first electric capacity are connected, the other end of this first electric capacity is connected with one end of this first resistance, the other end of this first resistance is connected with the anode tap of one first diode and the cathode terminal of this first Zener diode, the anode tap of this first Zener diode is connected to this first node, the cathode terminal of this first diode is connected with one end of one end of this second electric capacity and this second resistance.
10. current preheating type electric stabilizer as claimed in claim 9, it is characterized in that, this delay circuit comprises: one second diode, one the 3rd electric capacity, one the 3rd resistance and one the 4th resistance, one end of 3rd electric capacity is connected to this first diode and this second electric capacity and this second resistance, the other end of the 3rd electric capacity, the other end of this second resistance, the anode tap of this second diode and one end of the 4th resistance are connected to this first node, the cathode terminal of this second diode is connected with one end of the other end of the 3rd electric capacity and the 3rd resistance, the other end of the 3rd resistance is connected with the other end of the 4th resistance.
11. current preheating type electric stabilizers as claimed in claim 1, it is characterized in that, this inverter circuit also comprises: a power switch circuit, is connected to this control unit, this DC bus and this resonant circuit, to produce a demodulating voltage to this resonant circuit.
12. current preheating type electric stabilizers as claimed in claim 11, it is characterized in that, this inverter circuit also comprises: a half-bridge capacitance, be connected in series with this resonant circuit, and the responsibility cycle during running of this power switch circuit is 50%, this inverter circuit is semibridge system, is equivalent to partial pressure properties by this half-bridge capacitance.
13. current preheating type electric stabilizers as claimed in claim 1, is characterized in that, this detecting element be one with the one first auxiliary winding of this resonant inductance with core structure.
14. current preheating type electric stabilizers as claimed in claim 1, it is characterized in that, this inverter circuit also comprises a preheat circuit, is connected with this group fluorescent tube, to carry out preheating to this group fluorescent tube.
15. current preheating type electric stabilizers as claimed in claim 1, wherein this inverter circuit comprises a thermistor, is connected to two high-voltage switch gear ends of this resonant capacitance Circuit tuning.
16. current preheating type electric stabilizers as claimed in claim 1, it is characterized in that, the resonant capacitance circuit of this resonant circuit is connected to the two ends of this group fluorescent tube, this resonant capacitance circuit comprises: one first resonant capacitance and one second resonant capacitance, and two high-voltage switch gear ends of this second resonant capacitance and this resonant capacitance Circuit tuning are connected in series or in parallel.
17. 1 kinds of resonant capacitance adjustment elements, for the electronic component of the multiple pin of tool, be applied to an inverter circuit of a current preheating type electric stabilizer, it is characterized in that, this inverter circuit comprises a resonant circuit, and this resonant circuit is connected to this resonant capacitance adjustment element and one group of fluorescent tube, energy required during to provide this group fluorescent tube preheating, and comprise a resonant inductance and multiple resonant capacitance, this resonant capacitance adjustment element comprises:
One first switch element;
One control voltage produces circuit, is connected with a detecting element by two test sides of this resonant capacitance adjustment element, its utilize this detecting element to judge whether this inverter circuit comes into operation, and produce one first direct voltage of corresponding states; And
One delay circuit, the control end and this control voltage that are connected to this first switch element produce circuit, according to the state of this first direct voltage after a time of delay of postponing, produce one second direct voltage of corresponding states, to control this first switching elements conductive or open circuit, and make this resonant capacitance adjust the conducting of two high-voltage switch gear ends or the open circuit of element, to change the equivalent tank capacitance of this resonant circuit, to change the cross-pressure at the filament two ends in this group fluorescent tube.
18. resonant capacitance adjustment elements as claimed in claim 17, it is characterized in that, this first switch element is bilateral switching element or unidirectional switch elements.
19. resonant capacitance adjustment elements as claimed in claim 17, it is characterized in that, also comprise a full bridge rectifier, two of this full bridge rectifier exchange two high-voltage switch gear ends that end is connected to this resonant capacitance adjustment element, and two DC terminal of this full bridge rectifier are connected with two switch terminals of this first switch element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110287911.3A CN103025035B (en) | 2011-09-26 | 2011-09-26 | Resonant capacitance adjustment element and the current preheating type electric stabilizer that is suitable for |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110287911.3A CN103025035B (en) | 2011-09-26 | 2011-09-26 | Resonant capacitance adjustment element and the current preheating type electric stabilizer that is suitable for |
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| Publication Number | Publication Date |
|---|---|
| CN103025035A CN103025035A (en) | 2013-04-03 |
| CN103025035B true CN103025035B (en) | 2015-09-02 |
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| CN111641339B (en) * | 2020-05-19 | 2021-09-28 | 河海大学 | Bidirectional CLLLC resonant converter with variable capacitor and control method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201590942U (en) * | 2009-11-25 | 2010-09-22 | 中国电子科技集团公司第五十二研究所 | Electronic ballast of FM (frequency modulation) light-dimming fluorescent lamp |
| US7923942B1 (en) * | 2007-11-19 | 2011-04-12 | Universal Lighting Technologies, Inc. | Constant current source mirror tank dimmable ballast for high impedance lamps |
| CN102196648A (en) * | 2011-06-13 | 2011-09-21 | 台达电子企业管理（上海）有限公司 | Light tube ballast of filament heating device with gaseous discharge light tube |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100712641B1 (en) * | 2006-04-13 | 2007-05-02 | 조당 | Electronic ballast having a control circuit of cathode pre-heating current |
| US7560868B2 (en) * | 2007-05-11 | 2009-07-14 | Osram Sylvania, Inc. | Ballast with filament heating and ignition control |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7923942B1 (en) * | 2007-11-19 | 2011-04-12 | Universal Lighting Technologies, Inc. | Constant current source mirror tank dimmable ballast for high impedance lamps |
| CN201590942U (en) * | 2009-11-25 | 2010-09-22 | 中国电子科技集团公司第五十二研究所 | Electronic ballast of FM (frequency modulation) light-dimming fluorescent lamp |
| CN102196648A (en) * | 2011-06-13 | 2011-09-21 | 台达电子企业管理（上海）有限公司 | Light tube ballast of filament heating device with gaseous discharge light tube |
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