CN201986246U - Low-frequency electronic ballast for electrodeless discharge lamp - Google Patents
Low-frequency electronic ballast for electrodeless discharge lamp Download PDFInfo
- Publication number
- CN201986246U CN201986246U CN2010206883405U CN201020688340U CN201986246U CN 201986246 U CN201986246 U CN 201986246U CN 2010206883405 U CN2010206883405 U CN 2010206883405U CN 201020688340 U CN201020688340 U CN 201020688340U CN 201986246 U CN201986246 U CN 201986246U
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- circuit
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- electrodeless lamp
- electronic ballast
- power factor
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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
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The utility model discloses a low-frequency electronic ballast for an electrodeless discharge lamp. The electronic ballast comprises an EMC (Electro Magnetic Compatibility) anti-interference circuit, a PFC (Power Factor Correction) circuit and an MCU (Microprogrammed Control Unit) control circuit, wherein the EMC anti-interference circuit is connected between an external power supply and the PFC circuit, and used for processing electromagnetic interference signals; the PFC circuit is connected with the MCU control circuit, and used for obtaining DC signals with high-power factor, and then generates AC signals through the MCU control circuit to light the electrodeless lamp; and the MCU control circuit comprises an abnormal protection circuit for protecting the ballast from being damaged when heavy current occurs in the circuit.
Description
Technical field
The utility model relates to lighting field, relates more specifically to a kind of low frequency electrodeless lamp electronic ballast.
Background technology
As everyone knows, after Edison's invention carbon filament in 1879 incandescent lamp, lighting technology just enters a brand-new era.Look back the illumination history in 20th century, new light sources such as tungsten halogen lamp, fluorescent lamp, high-pressure mercury lamp, Metal halogen lamp, compact fluorescent lamp emerge in an endless stream.Yet, be 21 century " green illumination " the field HF lamp without electrodes of outshining othersOne branch of the tree is particularly thriving, with the characteristics of its high light efficiency, high-color rendering, life-span length, no color break-up, energy-conserving and environment-protective, shockproof, very little maintenance, come into our daily life.
Electrodeless lamp is a kind of new type light source that adopts fluorescent tube gas discharge and two principle combinations of electromagnetic induction.Existing electrodeless lamp mainly is made up of ballast, coupler and bulb three parts that scribble three primary colors fluorescent powder, its operation principle is: behind the supply voltage of input certain limit, ballast produces electric energy and gives coupler (induction coil in bulb centre), make the gas avalanche ionization in the bulb form plasma, spontaneous radiation went out the ultraviolet ray of 254nm when the plasma excited atom was returned ground state, and the fluorescent material of bulb inner wall is subjected to ultraviolet ray excited and sends visible light.
As seen, electrodeless lamp utilizes electric energy to enter bulb by filament with respect to conventional electric light source and is converted to luminous energy, and electrodeless lamp does not have filament or electrode, can not be restricted because of the chemical property of filament or electrode material, thereby fundamentally reduced light decay, improved luminous efficiency and life-span.And electrodeless lamp can start in moment, reaches whole light outputs, can not move back phenomenon because of producing light decay behind the multiple switching, so the life-span can reach tens thousand of hours.
Yet; because electrodeless lamp does not have filament yet; work in the electromagnetic coupled induction mode; the starting voltage height, so electrodeless lamp electronic ballast design difficulty is big, existing electroless lamp ballasting device; all be to adopt the electricity-saving lamp control chip mostly; fixed-frequency, abnormity protection function is poor, makes the ballast spoilage very high.
Therefore, be necessary to provide a kind of improved electrodeless lamp electronic ballast to overcome above-mentioned defective.
The utility model content
The purpose of this utility model provides a kind of low frequency electrodeless lamp electronic ballast, and it is main control chip that this low frequency electrodeless lamp electronic ballast adopts MCU, and adopts the AD acquisition controlling as abnormity protection circuit, and the accuracy height can make ballast life improve greatly.
For achieving the above object; the utility model adopts following technical scheme: a kind of low frequency electrodeless lamp electronic ballast; comprise the EMC anti-jamming circuit; PFC circuit of power factor correction and MCU control circuit; described EMC anti-jamming circuit is connected between external power source and the PFC circuit of power factor correction; in order to handle electromagnetic interference signal; described PFC circuit of power factor correction is connected with described MCU control circuit; be used to obtain the direct current signal of High Power Factor after light electrodeless lamp by MCU control circuit generation AC signal; described MCU control circuit comprises abnormity protection circuit, is used for protecting when abnormal conditions appear in circuit ballast not to be damaged.
Preferably, described EMC anti-jamming circuit comprises first differential mode capacitor, second differential mode capacitor and the bleeder resistance that is connected in parallel to ac voltage input in regular turn, be coupled between described first and second differential mode capacitor respectively, common mode inductance and differential mode inductance between second differential mode capacitor and the bleeder resistance, and be connected described first and second common mode capacitance between two outputs of described differential mode inductance and the ground wire.
Preferably, described PFC circuit of power factor correction comprises rectification circuit and current boost circuit, and described rectification circuit is made up of four rectifier diodes and a filter capacitor, is used for converting the electric main of described EMC anti-jamming circuit output to pulsating direct current; Described current boost circuit is made up of power factor controlling chip, field effect transistor, boost inductance, rectifier diode, energy storage flat wave capacitor and feedback control loop, is used for sending to described MCU control circuit after voltage with the pulsating direct current of described rectification circuit output improves.
Preferably, described MCU control circuit is made up of MCU main control chip and peripheral circuit, pulse signal by described MCU main control chip output amplifies after transformer output promotes half-bridge circuit through signal amplifier, thereby the direct current signal of PFC circuit of power factor correction output is changed into high frequency ac signal; Described high frequency ac signal is lighted electrodeless lamp after via resonant circuit.
Preferably, described abnormity protection circuit is the AD Acquisition Circuit.
Preferably, described AD Acquisition Circuit is made up of inductance, rectifier diode and current-limiting resistance, when abnormal conditions occurring, change into dc pulse signal by the signal of described inductance output through described rectifier diode and behind described current-limiting resistance, send described MCU main control chip back to, make described MCU main control chip output low level, thereby half-bridge circuit is ended, and then resonant circuit is quit work.
Preferably; described abnormity protection circuit also comprises the 2nd AD Acquisition Circuit; described the 2nd AD Acquisition Circuit is made up of first resonant capacitance, second resonant capacitance, coupling capacitance, current-limiting resistance and rectifier diode; when abnormal conditions occurring; signal is coupled through coupling capacitance by the intermediate point of described first resonant capacitance, second resonant capacitance; and after current-limiting resistance current limliting and rectifies, send described MCU main control chip back to; make described MCU main control chip output low level; thereby half-bridge circuit is ended, and then resonant circuit is quit work.
Preferably; described abnormity protection circuit also comprises the 3rd AD Acquisition Circuit; described the 3rd AD Acquisition Circuit is made up of first divider resistance and second divider resistance; when abnormal conditions occurring; direct current signal by described PFC circuit of power factor correction output is sent described MCU main control chip back to after described first divider resistance and the second divider resistance dividing potential drop; make described MCU main control chip output low level, thereby half-bridge circuit is ended, and then resonant circuit is quit work.
Compared with prior art, it is main control chip that low frequency electrodeless lamp electronic ballast of the present utility model adopts MCU, and adopts the AD Acquisition Circuit as abnormity protection circuit, is used for protecting when big electric current appears in circuit ballast not to be damaged the accuracy height.And the utility model also adopts the multi-channel A Acquisition Circuit to protect simultaneously, can more fast and effeciently detect the abnormal conditions in the circuit, thereby the life-span of ballast is improved greatly.
By following description also in conjunction with the accompanying drawings, it is more clear that the utility model will become, and these accompanying drawings are used to explain embodiment of the present utility model.
Description of drawings
Fig. 1 is the theory diagram of the utility model low frequency electrodeless lamp electronic ballast.
Fig. 2 is the circuit theory diagrams of the EMC anti-jamming circuit of ballast shown in Figure 1.
Fig. 3 is the circuit theory diagrams of the PFC circuit of power factor correction of ballast shown in Figure 1.
Fig. 4 is the circuit theory diagrams of the MCU control circuit of ballast shown in Figure 1.
Embodiment
With reference now to accompanying drawing, describe embodiment of the present utility model, the similar elements label is represented similar elements in the accompanying drawing.As mentioned above, the utility model provides a kind of low frequency electrodeless lamp electronic ballast, and it is main control chip that this low frequency electrodeless lamp electronic ballast adopts MCU, and adopts the AD acquisition controlling as abnormity protection circuit, and the accuracy height can make ballast life improve greatly.
Fig. 1 to Fig. 4 has showed an embodiment of a kind of low frequency electrodeless lamp electronic ballast of the present utility model.At first please refer to Fig. 1, be the theory diagram of the utility model low frequency electrodeless lamp electronic ballast.Described low frequency electrodeless lamp electronic ballast 100 comprises EMC anti-jamming circuit 101, PFC circuit of power factor correction 102 and MCU control circuit 103, described EMC anti-jamming circuit 101 is connected between external power source (figure does not show) and the PFC circuit of power factor correction 102, in order to handle electromagnetic interference signal; Described PFC circuit of power factor correction 102 is connected with described MCU control circuit 103; be used to obtain the direct current signal of High Power Factor after light electrodeless lamp by MCU control circuit 103 generation AC signal; described MCU control circuit 103 comprises abnormity protection circuit, is used for protecting when big electric current appears in circuit ballast not to be damaged.
Describe the part operation principle of the utility model low frequency electrodeless lamp electronic ballast below in detail.At first with reference to figure 2, Fig. 2 is the circuit theory diagrams of the EMC anti-jamming circuit of ballast shown in Figure 1.Described EMC anti-jamming circuit 101 comprises the first differential mode capacitor C1, the second differential mode capacitor C2 and the bleeder resistance R1 that is connected in parallel to ac voltage input in regular turn, be coupled between the described first differential mode capacitor C1 and the second differential mode capacitor C2 respectively, common mode inductance L1 and differential mode inductance L2 between the second differential mode capacitor C2 and the bleeder resistance R1, and be connected the described first common mode capacitance C3 and the second common mode capacitance C4 between two outputs of described differential mode inductance L2 and the ground wire.Behind the power connection, power supply signal enters described EMC anti-jamming circuit 101 and carries out filtering, power supply signal is handled through described differential mode filter circuit and two processes of common mode filtering circuit, the difference mode signal of its generation disturbs and the common-mode signal interference can effectively be eliminated, and more effectively reduce circuit to civil power conducted interference.Described bleeder resistance R1 is connected the two ends of the described first common mode capacitance C3 and the second common mode capacitance C4, and effect is to described first common mode capacitance C3 and second common mode capacitance C4 discharge, in case the incident that test and commissioning staff are shocked by electricity when operation takes place.Preferably, described EMC anti-jamming circuit 101 also comprises an anti-thunder tube and fuse (figure does not show), described anti-thunder tube is coupled between the L line and N line of described common mode inductance L1 and ac voltage input through fuse, be used for absorbing spike overvoltage and transition peak voltage, reach preferable lightning protection effect.
Please refer to Fig. 3, Fig. 3 is the circuit theory diagrams of the PFC circuit of power factor correction of ballast shown in Figure 1.Described PFC circuit of power factor correction 102 comprises rectification circuit and current boost circuit, described rectification circuit is made up of four full-wave rectification diode D1, D2, D3, D4 and filter capacitor C5, after the electric main of described EMC anti-jamming circuit 101 outputs was by described rectification circuit rectification, power supply signal converted the dc pulse power supply to by original electric main.Then, described dc pulse power supply enters described correcting circuit and proofreaies and correct, thereby obtains stable high-voltage DC power supply.The described correcting circuit of present embodiment is made up of power factor controlling chip U1, field effect transistor Q1, boost inductance L3, rectifier diode D5, energy storage flat wave capacitor C6 and feedback control loop, thus through the pulsating direct current of described rectification circuit output+voltage about 300V rises to+400V to be to flow to described MCU control circuit 103.
With reference to figure 4, Fig. 4 is the circuit theory diagrams of the MCU control circuit of ballast shown in Figure 1.Described MCU control circuit 103 is made up of MCU main control chip U2 and peripheral circuit, pulse signal by described MCU main control chip U2 output amplifies after the half-bridge circuit that transformer T1 output promotion is made up of field effect transistor Q2, Q3 through signal amplifier U3, thereby the direct current signal of PFC circuit of power factor correction 102 outputs is changed into high frequency ac signal, light electrodeless lamp behind the resonant circuit of described then high frequency ac signal via capacitor C 7, inductance L 4, resonant capacitance C8, C9 composition.
Described MCU control circuit 103 comprises abnormity protection circuit, and described abnormity protection circuit is the AD Acquisition Circuit, is used for protecting when big electric current appears in circuit ballast not to be damaged.In the present embodiment, described abnormity protection circuit adopts three road AD Acquisition Circuit to protect as multichannel.Specifically describe described three road AD Acquisition Circuit below.
As shown in Figure 4; the one AD Acquisition Circuit of present embodiment is by inductance L 4; rectifier diode D6 and current-limiting resistance R2 form; when abnormal conditions occurring; signal by described inductance L 4 outputs changes into dc pulse signal is sent described MCU main control chip U2 back to behind described current-limiting resistance R2 12 pin through described rectifier diode D6; control is from the 8 pin output low levels of MCU main control chip U2 when making described MCU main control chip U2 detect the voltage signal of certain volt value; thereby make by field effect transistor Q2; the half-bridge circuit that Q3 forms ends; and then resonant circuit is quit work; avoid big electric current to damage transistor, play the transistorized protective effect of switch.
Described the 2nd AD Acquisition Circuit is by described resonant capacitance C8; C9; coupling capacitance C10; current-limiting resistance R3 and rectifier diode D7 form; when abnormal conditions occurring; signal is by described resonant capacitance C8; the intermediate point of C9 is coupled through coupling capacitance C10; and after current-limiting resistance current limliting R3 and rectifier diode D7 rectification, send 9 pin of described MCU main control chip U2 back to; control is from the 8 pin output low levels of MCU main control chip U2 when making described MCU main control chip U2 detect the voltage signal of certain volt value; thereby make by field effect transistor Q2; the half-bridge circuit that Q3 forms ends; and then resonant circuit is quit work; avoid big electric current to damage transistor, play the transistorized protective effect of switch.
Described the 3rd AD Acquisition Circuit is made up of the first divider resistance R4 and the second divider resistance R5; when abnormal conditions occurring; after the described first divider resistance R4 and the second divider resistance R5 dividing potential drop, send 2 pin of described MCU main control chip back to by the direct current signal of described PFC circuit of power factor correction output; control is from the 8 pin output low levels of MCU main control chip U2 when making described MCU main control chip U2 detect the voltage signal that is lower than certain volt value; thereby make by field effect transistor Q2; the half-bridge circuit that Q3 forms ends; and then resonant circuit is quit work; avoid big electric current to damage transistor, play the transistorized protective effect of switch.
In sum, it is main control chip that low frequency electrodeless lamp electronic ballast of the present utility model adopts MCU, and adopts the AD Acquisition Circuit as abnormity protection circuit, is used for protecting when big electric current appears in circuit ballast not to be damaged the accuracy height.And the utility model also adopts the multi-channel A Acquisition Circuit to protect simultaneously, can more fast and effeciently detect the abnormal conditions in the circuit, thereby the life-span of ballast is improved greatly.
Abovely the utility model is described, but the utility model is not limited to the embodiment of above announcement, and should contains various modification, equivalent combinations of carrying out according to essence of the present utility model in conjunction with most preferred embodiment.
Claims (8)
1. low frequency electrodeless lamp electronic ballast; comprise the EMC anti-jamming circuit; PFC circuit of power factor correction and MCU control circuit; described EMC anti-jamming circuit is connected between external power source and the PFC circuit of power factor correction; in order to handle electromagnetic interference signal; described PFC circuit of power factor correction is connected with described MCU control circuit; be used to obtain the direct current signal of High Power Factor after light electrodeless lamp by MCU control circuit generation AC signal; it is characterized in that: described MCU control circuit comprises abnormity protection circuit, is used for protecting when abnormal conditions appear in circuit ballast not to be damaged.
2. low frequency electrodeless lamp electronic ballast as claimed in claim 1, it is characterized in that: described EMC anti-jamming circuit comprises first differential mode capacitor, second differential mode capacitor and the bleeder resistance that is connected in parallel to ac voltage input in regular turn, be coupled between described first and second differential mode capacitor respectively, common mode inductance and differential mode inductance between second differential mode capacitor and the bleeder resistance, and be connected described first and second common mode capacitance between two outputs of described differential mode inductance and the ground wire.
3. low frequency electrodeless lamp electronic ballast as claimed in claim 1, it is characterized in that: described PFC circuit of power factor correction comprises rectification circuit and correcting circuit, described rectification circuit is made up of four rectifier diodes and a filter capacitor, is used for converting the electric main of described EMC anti-jamming circuit output to pulsating direct current; Described correcting circuit is made up of power factor controlling chip, field effect transistor, boost inductance, rectifier diode, energy storage flat wave capacitor and feedback control loop, is used for sending to described MCU control circuit after voltage with the pulsating direct current of described rectification circuit output improves.
4. low frequency electrodeless lamp electronic ballast as claimed in claim 1, it is characterized in that: described MCU control circuit is made up of MCU main control chip and peripheral circuit, pulse signal by described MCU main control chip output amplifies after transformer output promotes half-bridge circuit through signal amplifier, thereby the direct current signal of PFC circuit of power factor correction output is changed into high frequency ac signal; Described high frequency ac signal is lighted electrodeless lamp after via resonant circuit.
5. low frequency electrodeless lamp electronic ballast as claimed in claim 4 is characterized in that: described abnormity protection circuit is the AD Acquisition Circuit.
6. low frequency electrodeless lamp electronic ballast as claimed in claim 5, it is characterized in that: described AD Acquisition Circuit is made up of inductance, rectifier diode and current-limiting resistance, when abnormal conditions occurring, change into dc pulse signal by the signal of described inductance output through described rectifier diode and behind described current-limiting resistance, send described MCU main control chip back to, make described MCU main control chip output low level, thereby half-bridge circuit is ended, and then resonant circuit is quit work.
7. low frequency electrodeless lamp electronic ballast as claimed in claim 5; it is characterized in that: described abnormity protection circuit also comprises the 2nd AD Acquisition Circuit; described the 2nd AD Acquisition Circuit is by first resonant capacitance; second resonant capacitance; coupling capacitance; current-limiting resistance and rectifier diode are formed; when abnormal conditions occurring; signal is by described first resonant capacitance; the intermediate point of second resonant capacitance is coupled through coupling capacitance; and after current-limiting resistance current limliting and rectifies, send described MCU main control chip back to; make described MCU main control chip output low level; thereby half-bridge circuit is ended, and then resonant circuit is quit work.
8. low frequency electrodeless lamp electronic ballast as claimed in claim 5; it is characterized in that: described abnormity protection circuit also comprises the 3rd AD Acquisition Circuit; described the 3rd AD Acquisition Circuit is made up of first divider resistance and second divider resistance; when abnormal conditions occurring; direct current signal by described PFC circuit of power factor correction output is sent described MCU main control chip back to after described first divider resistance and the second divider resistance dividing potential drop; make described MCU main control chip output low level; thereby half-bridge circuit is ended, and then resonant circuit is quit work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206883405U CN201986246U (en) | 2010-12-29 | 2010-12-29 | Low-frequency electronic ballast for electrodeless discharge lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206883405U CN201986246U (en) | 2010-12-29 | 2010-12-29 | Low-frequency electronic ballast for electrodeless discharge lamp |
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| Publication Number | Publication Date |
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| CN201986246U true CN201986246U (en) | 2011-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206883405U Expired - Fee Related CN201986246U (en) | 2010-12-29 | 2010-12-29 | Low-frequency electronic ballast for electrodeless discharge lamp |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102111945A (en) * | 2011-01-25 | 2011-06-29 | 中山市欧普照明股份有限公司 | Novel double-sampling abnormal protection circuit electronic ballast |
| CN102149244A (en) * | 2010-12-29 | 2011-08-10 | 广东泰卓光电科技股份有限公司 | Electronic ballast of low-frequency nonpolar lamp |
| CN102573247A (en) * | 2011-11-16 | 2012-07-11 | 上海浪腾电子科技有限公司 | Low-temperature starting circuit of electrodeless lamp ballast and use method |
-
2010
- 2010-12-29 CN CN2010206883405U patent/CN201986246U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102149244A (en) * | 2010-12-29 | 2011-08-10 | 广东泰卓光电科技股份有限公司 | Electronic ballast of low-frequency nonpolar lamp |
| CN102149244B (en) * | 2010-12-29 | 2014-12-31 | 广东泰卓光电科技股份有限公司 | Electronic ballast of low-frequency nonpolar lamp |
| CN102111945A (en) * | 2011-01-25 | 2011-06-29 | 中山市欧普照明股份有限公司 | Novel double-sampling abnormal protection circuit electronic ballast |
| CN102111945B (en) * | 2011-01-25 | 2014-05-28 | 欧普照明电器（中山）有限公司 | Novel electronic ballast with double sampling abnormal protection circuits |
| CN102573247A (en) * | 2011-11-16 | 2012-07-11 | 上海浪腾电子科技有限公司 | Low-temperature starting circuit of electrodeless lamp ballast and use method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110921 Termination date: 20151229 |
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| EXPY | Termination of patent right or utility model |