CN201813600U - Self-excited type electronic ballast having high output open-circuit voltage - Google Patents
Self-excited type electronic ballast having high output open-circuit voltage Download PDFInfo
- Publication number
- CN201813600U CN201813600U CN2010205109845U CN201020510984U CN201813600U CN 201813600 U CN201813600 U CN 201813600U CN 2010205109845 U CN2010205109845 U CN 2010205109845U CN 201020510984 U CN201020510984 U CN 201020510984U CN 201813600 U CN201813600 U CN 201813600U
- Authority
- CN
- China
- Prior art keywords
- triode
- self
- driving resistor
- switch
- circuit voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
The utility model relates to a self-excited type electronic ballast having high output open-circuit voltage, which comprises a self-oscillating half-bridge circuit, a choke inductor, a resonance capacitor and an OVC (Open Circuit Voltage) control circuit, wherein the choke inductor is coupled between the two output nodes of the self-oscillating half-bridge circuit, and the OVC control circuit is used for adjusting the access resistance values of a first drive resistor and a second drive resistor so as to improve output open-circuit voltage. When the self-excited type electronic ballast is powered on and started, the drive resistance value of an accessed circuit is reduced to improve drive current, change the work frequency of the ballast during starting, make the work frequency closer to LC oscillating frequency, achieve the purpose of improving output open-circuit voltage and ensure that a fluorescent lamp can be quickly turned on. The self-excited type electronic ballast has high practicability.
Description
Technical field
The utility model relates to electronic ballast for fluoresent lamp, relates in particular to a kind of auto-excitation type electric ballast.
Background technology
The driving self-excitation electric ballast of present magnet ring, as shown in Figure 1, it mainly is made up of half-bridge circuit, the choke induction that is connected with fluorescent tube and resonant capacitance, wherein half-bridge circuit is made up of the driving magnet ring that two diodes and of forming half-bridge of being in series have twice level windings, its operation principle is directly to drive half-bridge switch by the magnet ring secondary, thereby produces self-oscillation.We know, when fluorescent lamp starting, need bigger starting resistor, be output open circuit voltage (OCV) and since fluorescent lamp self make the technology difference, even for same fluorescent lamp, under different temperatures, the speed of lighting may be different, and this depends primarily on the size of output open circuit voltage.And existing ballast shown in Figure 1, its output open circuit voltage is by the intrinsic parameter decision of components and parts such as LC parameter and magnet ring parameter, so its output open circuit voltage swing is fixed, so, when the higher output open circuit voltage of needs starts fluorescent lamp, it does not accomplish, thus make fluorescent lamp to light speed slower, the application just is being based on above-mentioned background and the development and Design of carrying out.
The utility model content
The utility model purpose is to provide a kind of when starting in order to overcome the deficiencies in the prior art, thereby output open circuit voltage can improve the auto-excitation type electric ballast of lighting fluorescent tube rapidly.
For achieving the above object, the technical solution adopted in the utility model is: a kind of auto-excitation type electric ballast with high output open circuit voltage, comprise the self-oscillation half-bridge circuit, be coupled in the choke induction between self-oscillation half-bridge circuit two output nodes, resonant capacitance, described self-oscillation half-bridge circuit comprises first triode and second triode that is in series and connects and form half-bridge, drive magnet ring, described driving magnet ring comprises elementary winding, first secondary winding, the second subprime winding, wherein, the different name end of described elementary winding couples mutually with resonant capacitance, and the tie point of the end of the same name and first triode and second triode couples; The end of the same name of described first secondary winding couples with the first diode base stage mutually by first driving resistor, and the tie point of the different name end and first triode and second triode couples; The end of the same name of described second subprime winding couples mutually with the emitter of second diode, and the different name end couples mutually by the base stage of second driving resistor with second diode; This ballast also comprises and is used to regulate described first driving resistor and second driving resistor inserts resistance to improve the OVC control circuit of output open circuit voltage.
In a kind of mode according to enforcement that technique scheme is optimized, described OVC control circuit comprises by first and inserts the 4th resistance that switch and first driving resistor are in parallel the 3rd resistance that is connected, are in parallel and are connected by the second access switch and second driving resistor, when electrifying startup, the described first access switch and second inserts switch and is in closure state, described first driving resistor and the 3rd resistance are in parallel, and second driving resistor and the 4th resistance are in parallel; After the startup, the described first access switch and second inserts switch and is in open mode, and described first driving resistor disconnects with the 3rd resistance and being connected, and second driving resistor disconnects with the 4th resistance and being connected.
The described first access switch, second inserts opening with closure state of switch and is controlled by the 3rd triode, be connected ground connection behind the charging capacitor between described the 3rd transistor base and the emitter, and the back that is connected between its base stage and the collector electrode is connected with a power supply, first inserts switch, the second access switch is connected with the collector electrode of the 3rd triode.
It is the relay group that the described first access switch, second inserts switch.
Also be connected a capacitance between described choke induction and the second diode emitter.
Because technique scheme utilization, the utility model compared with prior art has following advantage: regulate the OVC control circuit that driving resistor inserts resistance by increase by one on the original ballast basis, when electrifying startup, reduce the driving resistor value of place in circuit, make drive current be improved, operating frequency when starting to change ballast, make its operating frequency more approach the LC frequency of oscillation, reach the bigger purpose of output open circuit voltage, guarantee that fluorescent lamp can be lighted rapidly, have bigger practicality.
Description of drawings
Accompanying drawing 1 is existing auto-excitation type electric ballast circuit diagram;
Accompanying drawing 2 is for having a circuit of electronic ballast figure that OVC controls according to concrete implement a kind of of the utility model institute;
Embodiment
Below in conjunction with accompanying drawing the utility model preferred embodiment is elaborated:
Electric ballast as shown in Figure 2, it mainly is made up of self-oscillation half-bridge circuit, resonant circuit and OVC control circuit, will describe each functional circuit structure below:
Wherein, the self-oscillation half-bridge circuit comprises the be in series first triode Q1 and the second triode Q2 that connect and form half-bridge, drives magnet ring, particularly, the emitter of the first triode Q1 is connected with the collector electrode of the second triode Q2, the collector electrode of the first triode Q1 is connected with dc bus voltage VBUS, the grounded emitter of the second triode Q2.Drive magnet ring and comprise elementary winding TA, the first secondary winding TB, second subprime winding TC, wherein, the different name end of elementary winding TA couples mutually with fluorescent tube LAMP, and the tie point of end of the same name and the first triode Q1 and the second triode Q2 couples; The end of the same name of the first secondary winding TB couples with the first diode Q1 base stage mutually by the first driving resistor R1, and the tie point of different name end and the first triode Q1 and the second triode Q2 couples; The end of the same name of second subprime winding TC couples mutually with the emitter of the second diode Q2, and the different name end couples with the base stage of the second diode Q2 mutually by the second driving resistor R2.
Resonant circuit mainly comprises and the fluorescent tube resonant capacitance Cres that is connected, an end and the resonant capacitance Cres choke induction Lres that the other end is connected with a capacitance C3 that is connected with fluorescent tube LAMP that is in parallel, the other end ground connection of described choke induction Lres.
The OVC control circuit comprises the 3rd resistance R 3 that is in parallel and is connected by the first access switch J1 and the first driving resistor R1, insert the 4th resistance R 4 that switch J2 and the second driving resistor R2 are in parallel and are connected by second, first inserts switch J1, second inserts opening with closure state of switch J2 is controlled by the 3rd triode Q3, be connected ground connection behind the charging capacitor C2 between the 3rd triode Q3 base stage and the emitter, and the back that is connected between its base stage and the collector electrode is connected with a power supply VDD, the first access switch J1, second inserts switch J2 is connected with the collector electrode of the 3rd triode Q3.In the present embodiment, it is the relay group that the first access switch J1, second inserts switch J2.
To the principle of present embodiment electric ballast raising output open circuit voltage be described below:
At power-up state not, first inserts switch J1, second inserts switch J2 is in open mode, the first driving resistor R1 and the 3rd resistance R 3, the second driving resistor R2 and the 4th resistance R 4 are in disconnected state respectively, when needs are lighted fluorescent lamp, when powering on, the OVC control circuit is gone up from VDD, capacitor C 1, C2 constantly charges, until the 3rd triode Q3 conducting, after the 3rd triode Q3 conducting, to drive first and insert switch J1, second inserts switch J2 closure, thereby the first driving resistor R1 and the 3rd resistance R 3, the second driving resistor R2 is in state in parallel respectively with the 4th resistance R 4, by circuit theory as can be known, the driving resistor of back in parallel two branch roads reduces, drive current will increase, drive current increases, to make the operating frequency of resonant circuit more near resonance point, thereby make that the output open circuit voltage of two outputs of half-bridge circuit is bigger, can make fluorescent tube light rapidly, after fluorescent tube was lighted, the voltage of lamp tube ends will reduce and be in stable state, at this moment, the first access switch J1 controlled once more by the OVC control circuit and the second access switch J2 opens, and recovers the mode of operation of existing electric ballast.
Present embodiment has improved topological structure on the basis of conventional electronic ballast circuit, under the situation that does not influence the electric ballast performance, improved output open circuit voltage OCV, make OCV controlled, thereby will expand the range of application of electric ballast greatly, have bigger practicality.
The foregoing description only is explanation technical conceive of the present utility model and characteristics; its purpose is to allow the personage who is familiar with this technology can understand content of the present utility model and enforcement according to this; can not limit protection range of the present utility model with this; all equivalences of being done according to the utility model spirit change or modify, and all should be encompassed within the protection range of the present utility model.
Claims (5)
1. auto-excitation type electric ballast with high output open circuit voltage, comprise the self-oscillation half-bridge circuit, be coupled between self-oscillation half-bridge circuit two output nodes and constitute the choke induction (Lres) of resonant circuit, resonant capacitance (Cres), described self-oscillation half-bridge circuit comprises first triode (Q1) and second triode (Q2) that is in series and connects and form half-bridge, drive magnet ring, described driving magnet ring comprises elementary winding (TA), first secondary winding (TB), second subprime winding (TC), wherein, the different name end of described elementary winding (TA) couples mutually with resonant capacitance (Cres), and the tie point of end of the same name and first triode (Q1) and second triode (Q2) couples; The end of the same name of described first secondary winding (TB) couples with first diode (Q1) base stage mutually by first driving resistor (R1), and the tie point of different name end and first triode (Q1) and second triode (Q2) couples; The emitter of the end of the same name of described second subprime winding (TC) and second diode (Q2) couples back ground connection, and the different name end couples mutually by the base stage of second driving resistor (R2) with second diode (Q2); It is characterized in that: this ballast also comprise be used to regulate described first driving resistor (R1) with second driving resistor (R2) thus insert the OVC control circuit that resistance improves output open circuit voltage.
2. the auto-excitation type electric ballast with high output open circuit voltage according to claim 1, it is characterized in that: described OVC control circuit comprises the 3rd resistance (R3) that is in parallel and is connected by the first access switch (J1) and first driving resistor (R1), insert the 4th resistance (R4) that switch (J2) and second driving resistor (R2) are in parallel and are connected by second, when electrifying startup, described first inserts switch (J1) is in closure state with the second access switch (J2), described first driving resistor (R1) is in parallel with the 3rd resistance (R3), and second driving resistor (R2) is in parallel with the 4th resistance (R4); After the startup, described first inserts switch (J1) is in open mode with the second access switch (J2), and described first driving resistor (R1) disconnects with the 3rd resistance (R3) and being connected, and second driving resistor (R2) disconnects with the 4th resistance (R4) and being connected.
3. the auto-excitation type electric ballast with high output open circuit voltage according to claim 2, it is characterized in that: the described first access switch (J1), second inserts opening with closure state of switch (J2) and is controlled by the 3rd triode (Q3), be connected a charging capacitor (C2) back ground connection between described the 3rd triode (Q3) base stage and the emitter, and the back that is connected between its base stage and the collector electrode is connected with a power supply (VDD), first inserts switch (J1), the second access switch (J2) is connected with the collector electrode of the 3rd triode (Q3).
4. the auto-excitation type electric ballast with high output open circuit voltage according to claim 3 is characterized in that: it is the relay group that the described first access switch (J1), second inserts switch (J2).
5. according to arbitrary described auto-excitation type electric ballast in the claim 1 to 4, it is characterized in that: also be connected a capacitance (C3) between described choke induction (Lres) and second diode (Q2) emitter with high output voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205109845U CN201813600U (en) | 2010-08-31 | 2010-08-31 | Self-excited type electronic ballast having high output open-circuit voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205109845U CN201813600U (en) | 2010-08-31 | 2010-08-31 | Self-excited type electronic ballast having high output open-circuit voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201813600U true CN201813600U (en) | 2011-04-27 |
Family
ID=43896534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205109845U Expired - Fee Related CN201813600U (en) | 2010-08-31 | 2010-08-31 | Self-excited type electronic ballast having high output open-circuit voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201813600U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102170739A (en) * | 2011-04-29 | 2011-08-31 | 吴江华能电子有限公司 | Preheating circuit applied to fluorescent lamp electronic ballast |
-
2010
- 2010-08-31 CN CN2010205109845U patent/CN201813600U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102170739A (en) * | 2011-04-29 | 2011-08-31 | 吴江华能电子有限公司 | Preheating circuit applied to fluorescent lamp electronic ballast |
| CN102170739B (en) * | 2011-04-29 | 2013-05-15 | 吴江华能电子有限公司 | Preheating circuit applied to fluorescent lamp electronic ballast |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202177974U (en) | LED traffic signal lamp and drive circuit thereof | |
| CN109661072A (en) | LLC resonant converter, LED drive circuit and its control method | |
| CN102484931B (en) | Power drive circuit, lighting device comprising power drive circuit and operating method of lighting device | |
| CN202206616U (en) | Constant current driving power supply for illumination of Light Emitting Diode (LED) | |
| CN201467542U (en) | Direct current (DC) electronic ballast and half-bridge inverter LC series-resonance circuit thereof | |
| CN201813600U (en) | Self-excited type electronic ballast having high output open-circuit voltage | |
| CN101022690B (en) | Electronic ballast | |
| CN201957308U (en) | Dimmable light emitting diode (LED) constant-current drive circuit | |
| CN212992001U (en) | Light-operated boost circuit with turn-off function | |
| CN201114951Y (en) | An electronic ballast for fluorescent lamp | |
| CN103068108B (en) | Half-bridge driver integrated circuit dedicated for energy-saving lamp | |
| CN104869723A (en) | Hybrid energy-saving grid drive system based on gate drive | |
| CN202210885U (en) | Dimming drive power for LED lighting | |
| CN101075791B (en) | Current mode resonance inverter | |
| CN201063935Y (en) | Electronic energy-saving lamp | |
| CN104411054A (en) | Same-phase alternating-current signal amplification type optical excitation gate drive system based on logic protection amplification circuit | |
| CN205142637U (en) | Electronic ballast circuit | |
| CN203301828U (en) | Electronic circuit of high reliable energy saving lamp | |
| CN201194442Y (en) | Novel energy-saving electric light source | |
| CN101060747B (en) | High efficiency resonance ballast | |
| CN203015210U (en) | Half-bridge driving integrated circuit special for energy-saving lamp | |
| CN202005051U (en) | Voltage feedback inverter circuit energy-saving lamp | |
| CN218733947U (en) | High-end drive power supply circuit based on wireless transmission | |
| CN1248286C (en) | direct current fluorescent lamp | |
| CN1972548B (en) | Current mode syntonic ballast |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20110427 Termination date: 20150831 |
|
| EXPY | Termination of patent right or utility model |