CN2121108U - Electronic ballast - Google Patents

Electronic ballast Download PDF

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Publication number
CN2121108U
CN2121108U CN 92209395 CN92209395U CN2121108U CN 2121108 U CN2121108 U CN 2121108U CN 92209395 CN92209395 CN 92209395 CN 92209395 U CN92209395 U CN 92209395U CN 2121108 U CN2121108 U CN 2121108U
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CN
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Prior art keywords
circuit
voltage
electronic ballast
pulse transformer
resonant
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CN 92209395
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Chinese (zh)
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吴杭辉
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吴杭辉
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Abstract

The utility model relates to an improvement for an electronic ballast. Both ends of a primary coil of a pulse transformer of a resonance circuit are connected in parallel with a voltage limiting circuit. When the electronic ballast works, the voltage limiting circuit is automatically switched on when the voltage applied on the primary coil of the pulse transformer rises to a certain value to prevent electric elements from breakdown because of the over-voltage when a lamp tube makes no glow starting. Simultaneously, the utility model can prevent the lamp from cold breakdown because a filament is not preheated in time but the voltage of a resonance capacitor rises quickly. The utility model has the advantages of simple structure, reliable work and low production cost.

Description

本实用新型涉及一种日光灯及其它放电灯的电子镇流器。 The present invention relates to an electronic ballast fluorescent lamps and other discharge lamps.

电子镇流器具有节约电能,启辉电压低,无频率闪烁,无需启辉器等优点。 Electronic ballast with a power-saving, low ignition voltage, no flicker frequency, no starter and so on. 但现有的国产电子镇流器性能不过关,如在图1所示的常用电子镇流器基本电路中,由于谐振电路电抗元件上的电压是电源电压的Q倍,当灯管出现异常现象,如灯管不启辉时,Q值很高。 However, the existing performance of domestic electronic ballasts, but off, as in a conventional electronic ballast circuit shown in FIG substantially, since the voltage on the resonant circuit is Q times the reactance element is a power supply voltage, the lamp when the abnormal phenomenon , such as the starter when the lamp is not, Q value is high. 加在脉冲变压器T线圈n1两端的电压也很高,通过耦合使次级线圈n2、n3也产生高电压,导致三极管BG1、BG2击穿,使镇流器损坏。 Applied across the coil n1 of the pulse transformer T is also high voltage, by coupling secondary coil n2, n3 can generate a high voltage, resulting in the transistor BG1, BG2 breakdown, damage to ballast. 另外,在日光灯灯丝未充分预热的情况下,由于谐振电容C4的电压迅速升高,会导致灯管的冷击穿,使灯管的阴极产生溅射而影响灯管寿命。 Further, in the case where the lamp filament is not sufficiently preheated, the rapid rise of the voltage of the resonant capacitor C4, will lead to the breakdown of the cold lamp, the lamp cathode sputtered affect lamp life. 上述问题的存在,使现有的电子镇流器难以推广应用。 The above problems, the existing electronic ballasts difficult application.

本实用新型的目的是要提供一种带有自动保护电路、且生产成本较低的新型电子镇流器,从而改进和完善电子镇流器性能。 The object of the present invention is to provide a protection circuit with an automatic, and lower production costs of the new electronic ballast, the electronic ballast to improve and perfect performance.

本实用新型的目的通过如下技术措施来实现:电子镇流器由电源电路,整流电路,滤波电路,启动电路,谐振电路及相位校正电路构成,谐振电路包括谐振电容C4,隔直电容C5,谐振电感L,脉冲变压器T及三极管BG1、BG2。 The object of the present invention is achieved by the following technical measures: the electronic ballast consists of a power supply circuit, a rectifier circuit, a filter circuit, starting circuit, the resonance circuit and the phase correction circuit, the resonant circuit comprises a resonant capacitor C4, a DC blocking capacitor C5, the resonant inductance L, the pulse transformer T and the transistor BG1, BG2. 本实用新型的技术特征是在脉冲变压器T线圈n1两端并联一限压电路。 The technical features of the present invention is at both ends of the parallel coil n1 of the pulse transformer T a voltage limiting circuit. 所述限压电路由两只稳压二极管和限流电阻串接构成。 The routing two piezoelectric limit limiting resistor and zener diode connected in series configuration.

本实用新型具有如下优点。 The present invention has the following advantages. 第一,在脉冲变压器线圈n1两端并联一限压电路后,当出现灯管不启辉等异常情况时,由于限压电路的作用,线圈n1两端电压就受到限制,以防电子元件被高压击穿。 After the first, both ends of the coil n1 of the pulse transformer in parallel with a voltage limiting circuit, when an abnormal situation occurs like the lamp without starter, by the action of the voltage limiting circuit, the voltage across the coil n1 is restricted to prevent the electronic components are high voltage breakdown. 其次,在灯管正常时限压电路还可有效地防止灯管冷击穿,以延长灯管使用寿命。 Next, the normal lamp voltage limit circuit may effectively prevent tube puncture cold, to extend the lamp life. 第三,采用稳压二极管及电阻作保护元件,反应迅捷,工作可靠,成本低廉,便于推广应用。 Thirdly, the Zener diode and the resistor for the protection element, quick response, reliable, low cost, easy application.

以下结合电原理图说明工作原理。 The following figure illustrates the principle of combined electrical works.

图1为现有技术电子镇流器基本电路图。 FIG 1 is a basic circuit diagram of the prior art electronic ballast.

图2为本实用新型实施例电原理图。 2 embodiment of the present invention of an electrical schematic diagram.

如图2所示,电源电压为交流220伏,50赫兹。 2, the power supply voltage is 220 volts AC, 50 Hz. 采用桥式全波整流电路。 Using full-wave bridge rectifier circuit. 电容C1为滤波电容,经滤波后可获得约300伏的流电压。 C1 is a filter capacitor, a DC voltage obtained after being filtered of about 300 volts. 电阻R1,电容C2和双向触发二极管DIAC组成启动电路。 Resistor R1, capacitor C2 and the diac DIAC composition starting circuit. 谐振电路由电容C4、隔直电容C5、电感L、脉冲变压器T及三极管BG1、BG2组成。 Resonant circuit formed by capacitor C4, blocking capacitor C5, the inductor L, the pulse transformer T and the transistor BG1, BG2 composition. 当接通电源后,经电阻R1对电容C2充电。 When the power is turned on, via a resistor R1 to charge the capacitor C2. 当C2的充电电压达到双向触发二极管DIAC的触发电压时,C2经DIAC和BG2的发射结而放电,三极管BG2导通。 C2 when the charging voltage reaches a trigger voltage of the bidirectional trigger diode of the DIAC, DIAC and C2 via the emitter junction of the discharge BG2, BG2 transistor is turned on. 此时,直流电压经灯丝1、2脚,谐振电容C4、灯丝3、4脚,隔直电容C5,谐振电感L,脉冲变压器T的线圈n1,BG2的集电极和发射极构成回路,给主要由电容C4、电感L组成的串联谐振电路充电。 At this time, the DC voltage via filament 2 feet, the resonant capacitor C4, a filament 3,4 feet, blocking capacitor C5, a resonant inductor L, the pulse transformer T coil n1, BG2 the collector and emitter to form a loop to the main , the series resonant circuit inductance L is charged by the capacitor C4. 因为脉冲变压器T的耦合作用,三极管BG1、BG2将轮流导通。 Because the coupling of the pulse transformer T, the transistor BG1, BG2 will by turns. 当BG1导通时,谐振电路放电。 When turned BG1, the resonant circuit discharges. 由于脉冲变压器的正反馈作用,使电路产生约几十KH2的高频振荡,且串联谐振时电抗元件上的电压为电源电压的Q倍,所以灯管从电容C4上就可取得较高的高频电压而启辉。 Since the pulse transformer positive feedback, so that high frequency oscillation circuit generates KH2 about several tens of, and the voltage on the serial resonance element reactance Q times the power supply voltage, the lamp can be made higher on capacitor C4 from the high frequency voltage starter. 一旦启辉,电流主要通过灯管形成回路,但电容C4上仍有一定的分流电流,电感L可起镇流作用。 Once the starter, a current loop is formed by the main tube, but the capacitor C4 is still some shunt current, the inductance L can play the role of the ballast. 电路起振后电容C2经二极管D5、三极管BG2放电,DIAC不会再有触发电压。 Since the oscillation circuit capacitor C2 through the diode D5, discharge transistor BG2, DIAC trigger voltage will not have. 当灯管不启辉时,由于限压电路的作用,使脉冲变压器T的线圈n2、n3的电压受到限制,从而保护了电子元件不被高压击穿。 When the starter lamp is not due to the action of the voltage limiting circuit, a coil of the pulse transformer T n2, n3 voltage is limited, thereby protecting the electronic element is not high voltage breakdown. 另外,当灯管正常时,由于限压电路的作用,电容C4两端的电压受到控制,而只有当灯丝预热到一定值时,灯管才会启辉,以防灯管冷击穿。 Further, when the lamp is normal, due to the effect of limiting the voltage circuit, the voltage across the capacitor C4 is controlled, but only when the filament is preheated to a certain value, the starter lamp will prevent cold lamp breakdown.

图中,稳压二极管Dz1、Dz2为3A3,限流电阻R为25Ω。 FIG Zener diode Dz1, Dz2 is 3A3, the current limiting resistor R is 25Ω.

Claims (2)

  1. 1.一种新型电子镇流器,由电源电路,整流电路,滤波电路,启动电路,谐振电路,相位校正电路等构成,谐振电路包含谐振电容C4、隔直电容C5、谐振电感L,脉冲变压器T及三极管BG1、BG2,其特征是:在谐振电路的脉冲变压器T绕组n1的两端并联一限压电路。 1. A novel electronic ballast consists of a power supply circuit, a rectifier circuit, a filter circuit, starting circuit, the resonant circuit, the phase correction circuit, a resonance circuit comprising a resonant capacitor C4, a DC blocking capacitor C5, a resonant inductor L, the pulse transformer T and the transistor BG1, BG2, wherein: both ends of the resonant circuit of the pulse transformer T winding n1 of a voltage limiting circuit connected in parallel.
  2. 2.根据权利要求1所述的新型电子镇流器,其特征在于所述限压电路由两只稳压二极管和限流电阻串接构成。 The new electronic ballast according to claim 1, wherein said piezoelectric route two limit limiting resistor and zener diode connected in series configuration.
CN 92209395 1992-05-07 1992-05-07 Electronic ballast CN2121108U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 92209395 CN2121108U (en) 1992-05-07 1992-05-07 Electronic ballast

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Application Number Priority Date Filing Date Title
CN 92209395 CN2121108U (en) 1992-05-07 1992-05-07 Electronic ballast

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CN2121108U true true CN2121108U (en) 1992-11-04

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101052261B (en) 2006-04-07 2010-12-22 联昌电子企业股份有限公司 Protector and cold cathode lamp tube driving system using said protector
CN102696279A (en) * 2009-11-02 2012-09-26 吉尼希斯系统有限责任公司 Electronic ballast circuit for lamps

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101052261B (en) 2006-04-07 2010-12-22 联昌电子企业股份有限公司 Protector and cold cathode lamp tube driving system using said protector
CN102696279A (en) * 2009-11-02 2012-09-26 吉尼希斯系统有限责任公司 Electronic ballast circuit for lamps
US8692474B2 (en) 2009-11-02 2014-04-08 Genesys Systems, Llc Electronic ballast circuit for lamps
US8947009B2 (en) 2009-11-02 2015-02-03 Genesys Global, LLC Electronic ballast circuit for lamps
US9338857B2 (en) 2009-11-02 2016-05-10 Genesys Global Llc Electronic ballast circuit for lamps
CN102696279B (en) * 2009-11-02 2016-06-22 吉尼希斯环球有限责任公司 Lamp electronic ballast circuit

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