CN201536447U - Self-oscillation electronic ballast free of transformer - Google Patents
Self-oscillation electronic ballast free of transformer Download PDFInfo
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- CN201536447U CN201536447U CN2009201746682U CN200920174668U CN201536447U CN 201536447 U CN201536447 U CN 201536447U CN 2009201746682 U CN2009201746682 U CN 2009201746682U CN 200920174668 U CN200920174668 U CN 200920174668U CN 201536447 U CN201536447 U CN 201536447U
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- 230000009183 running Effects 0.000 claims description 48
- 230000005669 field effect Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 3
- 238000013016 damping Methods 0.000 claims description 3
- 230000002045 lasting effect Effects 0.000 claims description 2
- 230000009024 positive feedback mechanism Effects 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000003071 parasitic effect Effects 0.000 description 3
- 230000009711 regulatory function Effects 0.000 description 3
- 230000008844 regulatory mechanism Effects 0.000 description 3
- 230000001427 coherent effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000003778 catagen phase Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008713 feedback mechanism Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
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- 230000005764 inhibitory process Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
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- 230000000737 periodic effect Effects 0.000 description 1
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
A self-oscillation electronic ballast free of transformer includes a rectifier circuit, a power switch, a bias circuit, a voltage divider and a power regulation circuit, wherein the rectifier circuit converts AC (alternating current) input voltage to DC (direct current) voltage, so as to provide bias voltage required by the power switch through the bias circuit; the power switch provides sine wave driving signals to drive the light tube; and the voltage divider executes voltage-dividing process on signals fed by the light tube to generate signals suitable for the driving of the power switch. The power regulation circuit is used for limiting drive power supplied to the power switch, thereby regulating the drive to the light tube.
Description
Technical field
The utility model relates to a kind of electric ballast, particularly relates to a kind of transformerless self-vibration formula electric ballast, and its feedback path only uses two ends such as inductance capacitance assembly to cooperate tube impedance so that feedback mechanism to be provided.
Background technology
The running of traditional magnetic Wound-rotor type ballast has many known disadvantage, for example low-yield efficient and high scintillation.Electric ballast (electronic ballast) to overcome above-mentioned shortcoming so just develop, but existing electric ballast uses two switches that direct current signal is converted to high frequency ac signal to start and to continue to light discharge lamp usually, this two switch then needs to use integrated circuit to be driven, and causes complicated apparatus structure and high circuit cost.The operating mechanism of other discharge at starting fluorescent tubes comprises the resistance-type electric ballast that makes apparatus glow discharge tube starter (glow bottle starter), but still can't significantly reduce structure complexity and circuit cost.So how under the prerequisite of not sacrificing operational effectiveness, the electric ballast that the minimum assembly of tool is provided has become important topic to reduce structure complexity and circuit cost.
The utility model content
Therefore main purpose of the present utility model is to provide a kind of transformerless self-vibration formula electric ballast, to address the above problem.
According to embodiment of the present utility model, it provides a kind of transformerless self-vibration formula electric ballast, is used for starting and continuing to light fluorescent tube.This kind self-vibration formula electric ballast includes rectifier circuit, first inductance, second inductance, first electric capacity, second electric capacity, first resistance, second resistance, the 3rd electric capacity, the 3rd resistance, power switch and the 3rd inductance.Rectifier circuit comprises a pair of input to receive AC-input voltage and pair of output with output dc voltage, wherein first output of the rectifier circuit Section Point of fluorescent tube that is used for being coupled.First inductance comprises first end and second end, first end the 3rd node of fluorescent tube that is used for being coupled wherein, second end be used for the being coupled first node of fluorescent tube.Second inductance comprises first end and second end, and wherein first end is coupled in the 5th node, second end be used for being coupled the 4th node of fluorescent tube.First electric capacity comprises first end and second end, and wherein first end is coupled in the 5th node, and second end is used for the Section Point that is coupled.Second electric capacity comprises first end and second end, and wherein first end is coupled in the 6th node, second end be used for being coupled the 4th node of fluorescent tube.First resistance comprises first end and second end, and wherein first end is coupled in the 6th node, second end be used for being coupled the 4th node of fluorescent tube.Second resistance is coupled in second output of rectifier circuit.The 3rd electric capacity and the 3rd resistance string are connected between second output of the 6th node and rectifier circuit.Power switch comprises output, earth terminal and control end, and wherein output is coupled in the 5th node, and earth terminal is coupled in second resistance.The 3rd inductance coupling high is between the control end of the 6th node and power switch.
According to embodiment of the present utility model, the self-vibration formula electric ballast that other provides a kind of tool to simplify framework is used for starting and continuing to light fluorescent tube.This kind self-vibration formula electric ballast includes rectifier circuit, first inductance, first resonant circuit, first electric capacity, first resistance, second resistance, power switch, voltage divider and second inductance.Rectifier circuit is in order to receiving AC-input voltage, an output of rectifier circuit be used for the being coupled Section Point of fluorescent tube.First inductance comprises first end and second end, and wherein first end is coupled in the 5th node, second end be used for the being coupled first node of fluorescent tube.First resonant circuit is coupled in the 5th node and the 6th node, is used for starting fluorescent tube.First electric capacity comprises first end and second end, and wherein first end is coupled in the 5th node, second end be used for the being coupled Section Point of fluorescent tube.First resistance comprises first end and second end, and wherein first end is coupled in the 6th node, second end be used for being coupled the 3rd node of fluorescent tube.Second resistance is coupled in second output of rectifier circuit.Power switch comprises output, earth terminal and control end, and wherein output is coupled in the 5th node, and earth terminal is coupled in second resistance.Voltage divider is used for the driving power switch.Second inductance coupling high is between the control end of the 6th node and power switch.
Description of drawings
Fig. 1 is the circuit diagram of the electric ballast of the utility model first embodiment.
Fig. 2 is the work coherent signal oscillogram of electric ballast shown in Figure 1, and wherein transverse axis is a time shaft.
Fig. 3 is the circuit diagram of the electric ballast of the utility model second embodiment.
Fig. 4 is the circuit diagram of the electric ballast of the utility model the 3rd embodiment.
Fig. 5 is the circuit diagram of the electric ballast of the utility model the 4th embodiment.
Wherein, description of reference numerals is as follows:
100,300,500,700 light-source systems
101 alternating current input power supplyings
110,310,510,710 electric ballasts
111,112,113,114 utmost point pipes
115 rectifier circuits
117 input capacitances
120,720 first inductance
125 second inductance
130 first electric capacity
131 the 5th nodes
132,732 thermistors
140,740 second electric capacity
145,745 first resistance
146 the 6th nodes
150 the 3rd electric capacity
155,355 power switchs
160 the 4th electric capacity
165 second resistance
170 the 3rd inductance
173 the 3rd resistance
175 first diodes
180 the 4th resistance
181 first nodes
182 Section Points
183 the 3rd nodes
184 the 4th nodes
185 second diodes
190 fluorescent tubes
191 first filaments
193 second filaments
385 parasitic diodes
565 the 3rd diodes
566 the 4th diodes
567 passive limiters
Embodiment
Please refer to Fig. 1, Fig. 1 is the circuit diagram of the electric ballast of the utility model first embodiment.As shown in Figure 1, light-source system 100 comprises alternating current input power supplying 101, fluorescent tube 190 and electric ballast 110.Alternating current input power supplying 101 is to be used for producing AC-input voltage.Fluorescent tube 190 is to be the discharge lamp (discharge lamp) with first filament 191 and second lamp 193.In one embodiment, fluorescent tube 190 is thermal cathode fluorescent tube (hot-cathode fluorescent lamp; HCFL).In another embodiment, fluorescent tube 190 is cathode fluorescent tube (cold-cathode fluorescent lamp; CCFL) or external-electrode fluorescent lamp pipe (external electrode fluorescent lamp; EEFL).First lamp 191 is coupled in 182 of first node 181 and Section Points, and second lamp 193 is coupled in 184 of the 3rd node 183 and the 4th nodes.Electric ballast 110 is coupled in alternating current input power supplying 101 and fluorescent tube 190, is used for carrying out the electric energy transition operation for electric pipe 190.
When power switch 155 switches to cut-off state by conducting state, the current i of the power switch 155 of flowing through
xTransfer to and flow to first electric capacity 130.That is, current i
xWhen switching to cut-off state, power switch 155, can not cause the immediate current changing condition for continuous.Second diode 185 is to be used for when power switch 155 operates in the reverse-conducting pattern, by by-pass current i
D2With protection power switch 155, wherein the reverse-conducting pattern is that the output corresponding to power switch 155 is a forward bias voltage drop, and earth terminal is the operating mode of reverse bias.Second electric capacity 140 and the 3rd electric capacity 150 are to be used for the load voltage of fluorescent tube 190 is carried out the dividing potential drop running, make the cross-pressure of the 3rd electric capacity 150 reduce to the voltage that is suitable for driving power switch 155.The damping action of the 3rd resistance 173 can reduce the circuit running quality factor by second electric capacity 140 and the 3rd capacitive divider that electric capacity 150 is formed, and is used for making start-up period to equate in fact because of tube impedance changes the phase difference that causes with lasting ignition phase.In addition, first diode 175 can be a general purpose diode, be about the long charge-storage time (charge-storage time) of 2 microseconds (micro second) by it, can be according to this carry out zero voltage switching (zero voltage switching at the control end of power switch 155; ZVS) running.Switch the control end that transient voltage inhibitor (switching-transient voltage suppressor) is coupled in power switch 155 because first diode 175 and the 4th resistance 180 can be combined to, be pressed on the control end of power switch 155 to regulate being supplied to the driving power of power switch 155 so the 4th resistance 180 can be used to set suitable negative bias in addition.From the above, the overload that electric ballast 110 can be avoided taking place fluorescent tube 190 drives running (especially at start-up period), so but the useful life of significant prolongation fluorescent tube 190.Moreover the filament 191,193 that electric ballast 110 can heat fluorescent tube 190 rapidly in start-up period to be to carry out the Fast starting running, therefore further useful life of prolonging lamp tube 190.On the other hand, drive,, also can protect power switch 155 to prolong its useful life so can prevent that also power switch 155 from bearing excessive voltage stress because electric ballast 110 can avoid operating on overload.
When electric ballast 110 has just begun by alternating current input power supplying 101 drivings in start-up period, the direct voltage that rectifier circuit 115 is exported is to be used for via first resistance 145 and second resistance 165 to provide starting power switch 155 required Dc bias, wherein the i.e. control end of substrate bias power switch 155 according to this of first resistance 145.The electric current that note that first inductance 120 of flowing through also can be used for heating first filament 191 except being used for the bias voltage as previously mentioned.When power switch 155 in start-up period by behind the suitable bias voltage, electric ballast 110 can be carried out the vibration running to produce the AC driving signal, but this AC driving signal is heat filament 191 not only, 193, also can operate, and provide high voltage drop to light fluorescent tube 190 in the two ends of fluorescent tube 190 according to the high quality factor of circuit.Because the employed semibridge system current transformer of prior art (half-bridge inverter), need be provided with trigger with the decapacitation circuit with in suitably power controlling switch running of start-up period, electric ballast 110 then need not be provided with to trigger with the decapacitation circuit and operate with power controlling switch 155, so the cost of the utility model electric ballast 110 can significantly reduce because of simplifying circuit structure.
When electric ballast 110 when start-up period vibrates, because this moment, fluorescent tube 190 inside still were high impedance status, so, can form phase reversal mechanism according to the circuit running of second inductance 125 and second electric capacity 140 from the junction (i.e. second filament 193) of the 5th node 131 to second inductance 125 and second electric capacity 140.Based on the demand of energy-efficient, as previously mentioned, the 3rd electric capacity 150 and second electric capacity 140 can be used to be combined as capacitive divider, and the voltage of dividing potential drop the 3rd node 183 is to provide driving power switch 155 required low-voltage according to this.Yet in the running of this capacitive divider, can be slightly leading in the phase place of the oscillator signal of the 6th node 146 because of the 3rd electric capacity 150 and second electric capacity 140.The 3rd inductance 170 and the 3rd electric capacity 150 can be combined to resonant circuit, its resonance frequency is lower than the operating frequency of electric ballast 110, in order to the phase place of delay oscillator signal in start-up period, and then compensation is leading because of the phase place that running caused of capacitive divider.In addition, as previously mentioned, it is the long charge-storage time (for example about 2 microseconds) of general purpose diode that first diode 175 can utilize it, to carry out the control end that zero voltage switching operates on power switch 155.Second resistance 165 can be used to the input resistance of firm power switch 155 in addition, so although operating temperature change or use different assembly manufacturing process, be early-fixed corresponding to the input resistance of the control end of power switch 155, or small resistance change rate only arranged.
When electric ballast 110 vibrates in continuing ignition phase, because this moment, fluorescent tube 190 inside were low impedance state, the circuit running of second inductance 125 and second electric capacity 140 only can cause a little phase lag of oscillator signal, that is do not form phase reversal mechanism, and in the feedback path of the 5th node 131 to the 6th nodes 146, as previously mentioned, still can make the phase place of oscillator signal slightly leading because of the circuit running of second electric capacity 140 and the 3rd electric capacity 150.Because the 3rd inductance 170, the 3rd electric capacity 150 and second electric capacity 140 can be combined to resonant circuit, and its resonance frequency is lower than the operating frequency of electric ballast 110, so in fluorescent tube 190 inside is under the low impedance state, the 3rd inductance 170, the 3rd electric capacity 150 and second electric capacity 140 can be in order to compensate the phase lag deficiency of oscillator signal at the control end of power switch 155.In like manner, in continuing ignition phase, it is the long charge-storage time (for example about 2 microseconds) of general purpose diode that first diode 175 still can utilize it, to carry out the control end that zero voltage switching operates on power switch 155.
By the negative resistance property that utilizes fluorescent tube 190, the electrical power change that is fed into fluorescent tube 190 can be suppressed, that is electric ballast 110 can further provide the power of lamp tube regulatory function.For example, when fluorescent tube 190 causes overload power because of too high drive current, the impedance meeting of fluorescent tube 190 reduces (tube impedance when promptly being lower than normal load power), so being fed into the AC driving voltage of signals at fluorescent tube 190 two ends will reduce, thereby reduce the oscillating voltage signal of the control end be fed into power switch 155, and then reduce the driving power that is supplied to fluorescent tube 190.Because existing electric ballast mainly is to utilize the saturation magnetization coil that is connected in series with fluorescent tube so that the load current regulation mechanism to be provided, or utilize the control end voltage of Low ESR assembly with the power-limiting switch, and the lamp tube power supply of electric ballast 110 mechanism is because of having the power of lamp tube regulatory function, can change so that more stable lamp tube power supply to be provided, so required voltage of prior art or current adjustment mechanism need be set by the power of lamp tube that the 101 input changes of inhibition alternating current input power supplying cause.Yet in start-up period; the power of lamp tube regulatory function of electric ballast 110 is not done in order to guard lamp pipe 190; so the thermistor 132 of tool positive temperature coefficient just is set especially at Section Point 182 and 184 of the 4th nodes, is used for limiting driving to power switch 155 to increase the service life.In addition, the setting of thermistor 132 all operates because of detecting continuously with the direct current of second filament 193, so can be avoided reducing the detecting reliability because of short circuit interacts corresponding to two sensing points that the direct current of first filament 191 and second filament 193 is detected continuously by corresponding load point and corresponding sensing points corresponding to first filament 191.
The direct voltage that rectifier circuit 115 is exported note that when first filament 191 burns, owing to can't be fed into the output of power switch 155 to set up bias voltage, so electric ballast 110 can automatic halt circuit running.In like manner, when second filament 193 burnt, then direct voltage also can't be fed into the control end of power switch 155 to set up bias voltage, so also halt circuit running automatically of electric ballast 110.In addition, when the 3rd inductance 170 or second resistance, 165 generation open circuit incidents, still can't set up bias voltage to power switch 155, so also halt circuit running automatically of electric ballast 110.In other words, when the part assembly generation open circuit incident of disintegration of filament incident or electric ballast 110 took place fluorescent tube 190, electric ballast 110 can operate with protective circuit by automatic halt circuit, and this is another important feature of electric ballast 110.
Fig. 2 is the work coherent signal oscillogram of electric ballast 110 shown in Figure 1, and wherein transverse axis is a time shaft.In Fig. 2, Vce and current i fall in the collection emitter voltage that basipetal signal is respectively power switch 155
x, that is hypothesis power switch 155 is a bipolar transistor.Please refer to Fig. 2 and Fig. 1, when power switch 155 in period Ton during conducting, the collection emitter voltage falls Vce and approximately remains on no-voltage, and current i
xThen from a low current I
LBe incremented to a high electric current I to be close to linear mode
H, low current I wherein
LBe actually negative current.
When working in the reverse-conducting pattern in the sub-period Δ Tm1 of power switch 155 at period Ton, current i
xBe negative current, and collected current i
cAlso be negative current, this moment, second diode 185 was to be used for by-pass current i
D2, that is to say most current i
x Second diode 185 of flowing through has only the current i of fraction
xThe power switch 155 of flowing through delays the assembly catagen speed of power switch 155 according to this.When working in forward conduction mode in the sub-period Δ Tm2 of power switch 155 at period Ton, current i
xBe positive current, and collected current i
cEqual current i in fact
x
When power switch 155 ended in period Toff, the change in voltage waveform that Vce falls in the collection emitter voltage roughly formed positive semifocal chord ripple, and current i
xThen from high electric current I
HBe decremented to low current I
LNote that when power switch 155 switches to cut-off state current i
xBe to flow to first electric capacity 130, promptly do not flow to power switch 155 from first inductance 120, in other words, by current i
xThen flow to the running of first electric capacity 130, can avoid taking place the situation of electric current instantaneous variation.In the sub-period Δ Tm3 of period Toff, current i
xWork in charge mode for positive current makes first electric capacity 130, the collection emitter voltage falls Vce and then boosts to a high voltage V by the charging running of first electric capacity 130
HIn the sub-period Δ Tm4 of period Toff, current i
xBecome negative current and make first electric capacity 130 work in discharge mode, the collection emitter voltage falls Vce and then is depressurized to by the discharge of first electric capacity 130 running and is about no-voltage.Note that power switch 155 is to fall Vce when being about no-voltage at the collection emitter voltage, carry out by/conducting state is switched running, that is electric ballast 110 can operate on the zero voltage switching pattern with protection power switch 155.
The collection emitter voltage of tool periodic pulses falls Vce and feedbacks to the feedback path of electric ballast 110, vibrates according to this and produce chord wave type AC driving signal to be fed into fluorescent tube 190.In addition, as previously mentioned, a plurality of phase shifters by two ends assemblies such as a plurality of inductance of electric ballast 110 and a plurality of electric capacity are made up cooperate the impedance of fluorescent tube 190 again, and the oscillator signal of electric ballast 110 can be adjusted with the required accurate positive feedback running of incision self-vibration easily by the circuit running.
Please refer to Fig. 3, Fig. 3 is the circuit diagram of the electric ballast of the utility model second embodiment.As shown in Figure 3, light-source system 300 comprises alternating current input power supplying 101, fluorescent tube 190 and electric ballast 310.Electric ballast 310 is similar to electric ballast shown in Figure 1 110, main difference is to omit first diode 175, second diode 185 and the 4th resistance 180, and power switch 155 is replaced into power switch 355, be provided with in addition in addition between the control end and earth terminal (source terminal) that the 4th electric capacity 160 is coupled in power switch 355.Power switch 355 comprises field-effect transistor, as shown in Figure 3, has parasitic diode 385 between its output and earth terminal (source terminal).Parasitic diode 385 is to be used for when power switch 355 works in the reverse-conducting pattern, and by-pass current id3 is with protection power switch 355, that is the circuit operational function of second diode 185 that is omitted is provided.Because direct current running can not operate between the control end of second output of rectifier circuit 115 and power switch 355, can't influence the required Dc bias of power switch 355 so omit first diode 175 and the 4th resistance 180.Electric ballast 310 differs from the circuit running of electric ballast 110, the mos capacitance that mainly is power switch 355 can cooperate the 4th electric capacity 160 so that phase compensation mechanism to be provided, carry out the zero voltage switching running according to this, other circuit runnings are same as electric ballast 110, so repeat no more.
Please refer to Fig. 4, Fig. 4 is the circuit diagram of the electric ballast of the utility model the 3rd embodiment.As shown in Figure 4, light-source system 500 comprises alternating current input power supplying 101, fluorescent tube 190 and electric ballast 510.Electric ballast 510 is similar to electric ballast shown in Figure 1 110, and main difference is to comprise in addition by the 3rd diode 565 and is connected in series with the 4th diode 566 and the passive limiter 567 formed, is omitted as for 132 of the thermistors of tool positive temperature coefficient.Passive limiter 567 is coupled between second output of the control end of power switch 155 and rectifier circuit 115.In the running of electric ballast 510, the pressure drop of second resistance 165 can't be greater than PN diode junction voltage, so in start-up period, just can limit the control end voltage peak of driving power switch 155.
Please refer to Fig. 5, Fig. 5 is the circuit diagram of the electric ballast of the utility model the 4th embodiment.As shown in Figure 5, light-source system 700 comprises alternating current input power supplying 101, fluorescent tube 190 and electric ballast 710.Electric ballast 710 is similar to electric ballast shown in Figure 1 110, main difference is first inductance 120 is replaced into first inductance 720 of cross-over connection in fluorescent tube 190, thermistor 132 is replaced into the thermistor 732 of first inductance 720 in parallel, second electric capacity 140 is replaced into second electric capacity 740, and first resistance 145 is replaced into first resistance 745.The combinational circuit of thermistor 732, second inductance 125, second electric capacity 740 and first resistance 745 can be carried out the direct current of filament according to this and detect continuously.In addition because second inductance 125 can be stablized the circuit running of first inductance 720 and fluorescent tube 190, so the operating current of cpable of lowering power switch 155.
In sum,, the utility model electric ballast drives, so but significant prolongation fluorescent tube useful life because can carrying out the heating of quick filament or avoid taking place overload.In addition, be used for the oscillator signal that the utility model electric ballast of light-source system is produced, can be adjusted easily with the required accurate positive feedback running of incision self-vibration by the circuit running.The utility model electric ballast utilizes the long charge-storage time characteristic of general purpose diode to carry out the zero voltage switching running in addition, protects power switch according to this.On the other hand, the utility model electric ballast need not be provided with to trigger with the decapacitation circuit and operate with the power controlling switch, therefore can significantly simplify circuit structure to reduce cost.Negative resistance property as for fluorescent tube is then changed with the power of lamp tube that suppresses to cause because of the alternating current input power supplying instability by the utilization of the utility model electric ballast, that is the utility model electric ballast can further provide the power of lamp tube regulation mechanism, and before the running of power of lamp tube regulation mechanism, can limit driving in addition to power switch.
The above only is a preferred embodiment of the present utility model, and all equalizations of being done according to the utility model claim change and modify, and all should belong to covering scope of the present utility model.
Claims (19)
1. transformerless self-vibration formula electric ballast, it includes:
One rectifier circuit comprises a pair of input to receive an AC-input voltage and pair of output to export a direct current voltage, wherein one first output of this rectifier circuit Section Point of a fluorescent tube that is used for being coupled;
It is characterized in that:
One first inductance comprises one first end and one second end, this first end one the 3rd node of this fluorescent tube that is used for being coupled wherein, this second end be used for a being coupled first node of this fluorescent tube;
One second inductance comprises one first end and one second end, and wherein this first end is coupled in one the 5th node, this second end be used for being coupled one the 4th node of this fluorescent tube;
One first electric capacity comprises one first end and one second end, and wherein this first end is coupled in the 5th node, this second end this Section Point that is used for being coupled;
One second electric capacity comprises one first end and one second end, and wherein this first end is coupled in one the 6th node, this second end be used for being coupled the 4th node of this fluorescent tube;
One first resistance comprises one first end and one second end, and wherein this first end is coupled in the 6th node, this second end be used for being coupled the 4th node of this fluorescent tube;
One second resistance is coupled in one second output of this rectifier circuit;
One the 3rd electric capacity and one the 3rd resistance are serially connected with between second output of the 6th node and this rectifier circuit;
One power switch comprises an output, an earth terminal and a control end, and wherein this output is coupled in the 5th node, and this earth terminal is coupled in this second resistance; And
One the 3rd inductance is coupled between the control end of the 6th node and this power switch.
2. self-vibration formula electric ballast as claimed in claim 1, the main circuit function that it is characterized in that this first inductance is that an ac current source is provided according to this.
3. self-vibration formula electric ballast as claimed in claim 1 is characterized in that this second electric capacity and the 3rd capacitance group are combined into a voltage divider that is used for driving this power switch.
4. self-vibration formula electric ballast as claimed in claim 3, the damping action that it is characterized in that the 3rd resistance can reduce the quality factor corresponding to this bleeder circuit running according to this, is used for making start-up period and lasting ignition phase to equate in fact because of the phase difference that the impedance variation of this fluorescent tube causes.
5. self-vibration formula electric ballast as claimed in claim 1 is characterized in that this second inductance and this second capacitance group are combined into a resonance circuit that is used for starting this fluorescent tube.
6. self-vibration formula electric ballast as claimed in claim 1 is characterized in that the 3rd inductance and the 3rd capacitance group are combined into a resonance circuit, and a resonance frequency of this resonant circuit is lower than an operating frequency of this self-vibration formula electric ballast.
7. self-vibration formula electric ballast as claimed in claim 1 is characterized in that this second inductance, the 3rd inductance, this second electric capacity are used for cooperating the impedance of this fluorescent tube so that a positive feedback mechanism to be provided with the 3rd electric capacity.
8. self-vibration formula electric ballast as claimed in claim 1, when it is characterized in that one first disintegration of filament when this fluorescent tube, can cut off the electric connection of the output of a direct current power supply that this rectifier circuit provides and this power switch, and stop the luminous running of this fluorescent tube.
9. self-vibration formula electric ballast as claimed in claim 1 when it is characterized in that a disintegration of filament of this fluorescent tube, can cut off the feed lines of the required Dc bias of this power switch of starting, and stops the luminous running of this fluorescent tube.
10. self-vibration formula electric ballast as claimed in claim 1 is characterized in that this power switch comprises a bipolar transistor.
11. self-vibration formula electric ballast as claimed in claim 1 is characterized in that this power switch comprises a field-effect transistor.
12., it is characterized in that this self-vibration formula electric ballast includes in addition as the self-vibration formula electric ballast that claim 11 is stated:
One the 4th electric capacity is coupled between the control end and earth terminal of this power switch, carries out the zero voltage switching running according to this.
13. self-vibration formula electric ballast as claimed in claim 1 is characterized in that this self-vibration formula electric ballast includes in addition:
One first diode and one the 4th resistance, be serially connected with between second output of the control end of this power switch and this rectifier circuit, wherein this first diode is the unidirectional current conducting running that is used for carrying out from second output of this rectifier circuit to the control end of this power switch;
One second diode is coupled between second output of the 5th node and this rectifier circuit, and this second diode is the unidirectional current conducting running that is used for carrying out from second output of this rectifier circuit to the 5th node; And
One passive limiter is coupled between second output of the control end of this power switch and this rectifier circuit, is used in start-up period restriction to the driving of this power switch.
14. self-vibration formula electric ballast as claimed in claim 13 is characterized in that this passive limiter comprises:
One the 3rd diode and one the 4th diode are serially connected with between second output of the control end of this power switch and this rectifier circuit.
15. self-vibration formula electric ballast as claimed in claim 1 is characterized in that this self-vibration formula electric ballast includes in addition:
One input capacitance, this that is coupled in this rectifier circuit is to output.
16. self-vibration formula electric ballast as claimed in claim 1 is characterized in that this self-vibration formula electric ballast includes in addition:
One first diode and one the 4th resistance, be serially connected with between second output of the control end of this power switch and this rectifier circuit, wherein this first diode is the unidirectional current conducting running that is used for carrying out from second output of this rectifier circuit to the control end of this power switch;
One second diode is coupled between second output of the 5th node and this rectifier circuit, and this second diode is the unidirectional current conducting running that is used for carrying out from second output of this rectifier circuit to the 5th node; And
The thermistor of one tool positive temperature coefficient is coupled between this first node and the 3rd node, and this thermistor is intended to be the driving that limits in the start-up period this power switch.
17. self-vibration formula electric ballast as claimed in claim 1 is characterized in that this second inductance can stablize the circuit running of this first inductance and this fluorescent tube.
18. a transformerless self-vibration formula electric ballast, it includes:
One rectifier circuit, in order to receiving an AC-input voltage, one first output of this rectifier circuit be used for a being coupled Section Point of a fluorescent tube;
It is characterized in that:
One first inductance comprises one first end and one second end, and wherein this first end is coupled in one the 5th node, this second end be used for being coupled first node of this fluorescent tube;
One first resonant circuit is coupled in the 5th node and one the 6th node, is used for starting this fluorescent tube;
One first electric capacity comprises one first end and one second end, and wherein this first end is coupled in the 5th node, this second end be used for being coupled Section Point of this fluorescent tube;
One first resistance comprises one first end and one second end, and wherein this first end is coupled in the 6th node, this second end be used for being coupled one the 3rd node of this fluorescent tube;
One second resistance is coupled in one second output of this rectifier circuit;
One power switch comprises an output, an earth terminal and a control end, and wherein this output is coupled in the 5th node, and this earth terminal is coupled in this second resistance;
One voltage divider is used for driving this power switch; And
One second inductance is coupled between the control end of the 6th node and this power switch.
19. self-vibration formula electric ballast as claimed in claim 18, it is characterized in that this voltage divider comprises one second electric capacity, this second electric capacity and this second inductor combination are one second resonant circuit, and a resonance frequency of this second resonant circuit is lower than an operating frequency of this electric ballast.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US16303109P | 2009-03-24 | 2009-03-24 | |
| US61/163,031 | 2009-03-24 | ||
| US12/500,611 US8174201B2 (en) | 2009-03-24 | 2009-07-10 | Self-oscillating transformerless electronic ballast |
| US12/500,611 | 2009-07-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201536447U true CN201536447U (en) | 2010-07-28 |
Family
ID=42536220
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201746682U Expired - Fee Related CN201536447U (en) | 2009-03-24 | 2009-09-18 | Self-oscillation electronic ballast free of transformer |
| CN200910174614A Pending CN101848592A (en) | 2009-03-24 | 2009-09-18 | Self-oscillating transformerless electronic ballast |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910174614A Pending CN101848592A (en) | 2009-03-24 | 2009-09-18 | Self-oscillating transformerless electronic ballast |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN201536447U (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6072710A (en) * | 1998-12-28 | 2000-06-06 | Philips Electronics North America Corporation | Regulated self-oscillating resonant converter with current feedback |
| US6144173A (en) * | 1999-11-10 | 2000-11-07 | General Electric Company | Single switch electronic ballast |
| CN2479708Y (en) * | 2001-01-20 | 2002-02-27 | 上海奉德电子照明工程有限公司 | Switch-type stabilized electronic ballast |
| CN1750729A (en) * | 2004-09-17 | 2006-03-22 | 国际整流器公司 | Simplifies Hybrid Ballast Control Circuitry in a Package |
-
2009
- 2009-09-18 CN CN2009201746682U patent/CN201536447U/en not_active Expired - Fee Related
- 2009-09-18 CN CN200910174614A patent/CN101848592A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN101848592A (en) | 2010-09-29 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100728 Termination date: 20100918 |