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WO2007076641A1 - Electronic ballast startup output current-limited circuit for high voltage sodium lamp - Google Patents

Electronic ballast startup output current-limited circuit for high voltage sodium lamp Download PDF

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Publication number
WO2007076641A1
WO2007076641A1 PCT/CN2006/000158 CN2006000158W WO2007076641A1 WO 2007076641 A1 WO2007076641 A1 WO 2007076641A1 CN 2006000158 W CN2006000158 W CN 2006000158W WO 2007076641 A1 WO2007076641 A1 WO 2007076641A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit
relay
electronic ballast
transformers
voltage
Prior art date
Application number
PCT/CN2006/000158
Other languages
English (en)
French (fr)
Inventor
Xiuqing Chen
Original Assignee
Shi, Junsheng
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shi, Junsheng filed Critical Shi, Junsheng
Publication of WO2007076641A1 publication Critical patent/WO2007076641A1/zh

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/02—Details
    • H05B41/04—Starting switches
    • H05B41/042—Starting switches using semiconductor devices
    • 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

Definitions

  • the utility model relates to the field of electric lighting, in particular to a circuit device for ignition and control of a discharge lamp. Background technique
  • High-intensity discharge lamps are a new type of energy-saving electric light source with a wide range of applications, and have gradually become the preferred source of light for public places and home lighting.
  • the starting output circuit of the current electronic ballast is usually a method in which a transformer is connected in series, such as Chinese patent ZL00246388. 1 discloses a "low-cost electronic ballast for high-power high-intensity discharge lamps", the electronic town
  • the resonant output circuit of the flow device is composed of an inverter circuit, an oscillation starting circuit and a ballast lighting circuit.
  • the ballast lighting circuit is composed of a transformer T2 and a capacitor C14.
  • the transformer T2 is composed of two main coils connected in series and two sub coils connected in series.
  • the transformer T2 generates a resonant high frequency and high voltage to provide a starting voltage and a ballast voltage for the metal halide lamp.
  • the primary winding of the transformer acts as a current limiting coil to control the current change of the lamp to stabilize the lamp.
  • the current ignition voltage generated by electronic ballasts can only reach 2000 to 3000V, while the high voltage sodium lamps such as power 400W require a higher starting voltage, generally 5KV or more, so general electronic ballasts cannot be applied to High-pressure sodium lamp with output power above 400W. Since the current limiting coils acting as ballasts have a large impedance after being connected in series, the heat generation of the transformer is large, and the stability and reliability of the electronic ballast are poor. Summary of the invention
  • the purpose of the utility model is to provide a high-voltage sodium lamp electronic ballast starting output current limiting circuit with large output power, low heat generation and stable performance.
  • the technical scheme adopted by the utility model is: A high-pressure sodium lamp electronic ballast starting output current limiting circuit, comprising a trigger circuit and a starting circuit, the starting circuit has two transformers T3, ⁇ 4, a trigger circuit A start signal is provided for the start circuit; two relays J1 and 12 are connected between the two transformers ⁇ 3 and ⁇ of the start circuit, and the secondary coils of the two transformers are connected in series, and the two relays are controlled by a control circuit after the start circuit generates the ignition voltage.
  • the signal is supplied to operate, and the primary coils that function as current limiting in the two transformers are converted from a series connection to a parallel connection.
  • the control circuit has a triode Q7 and an RS flip-flop U6; the signal output end of the RS flip-flop U6 is The base of the transistor Q7 is connected, the emitter of the transistor Q7 is grounded, and the collector of the transistor Q7 is connected to the relay J1. When the transistor Q7 is turned on, the relay J1 is energized.
  • the primary windings of the transformers T3 and T4 of the starting circuit are connected in series through the normally closed contacts of the relay J2; the normally open contacts of the relay J2 are connected to the load, and the primary coil of the transformer T4 is turned on when closed; the relay J1 Two normally closed contacts are suspended, one normally open contact of relay J1 is connected to the low voltage power supply, and when closed, the coil of relay J2 is energized; the other normally open contact of relay J1 is connected with the primary coil of transformer T3, closed
  • the primary winding of the transformer T3 is turned on; one end of the coil of the relay J1 is connected to the low voltage power supply, and the other end of the coil of the relay J1 is connected to the collector of the transistor Q7 of the above control circuit.
  • the diodes D11 and D12 functioning as a step-down function are also disposed between the relay J1 and the low-voltage power source.
  • the model of the RS trigger U6 is CD4013. Compared with the prior art, the above technical solution has the following advantages: The utility model controls the connection method of the primary windings of the transformers T3 and ⁇ 4 by using a control circuit, and the primary windings of the ⁇ 3 and ⁇ 4 are connected in series before the trigger point of the bulb, and The inductance is relatively large, ensuring that the bulb can be reliably triggered to illuminate.
  • the control circuit converts the control terminals J1 and J2 to change the primary windings of T3 and ⁇ 4 from the original series connection to the parallel connection.
  • the bulb can be reliably triggered to start, and the output power of the electronic ballast can also meet the requirements;
  • the impedance is reduced to about a quarter of the series connection, and the temperature of ⁇ 3, ⁇ 4
  • the rise is controlled, and the current-limiting method in which the temperature rise is connected in series with the common inductor is reduced by at least 50%, so that the overall temperature rise of the electronic ballast is reduced by at least 30%, thereby greatly improving the stability and reliability of the electronic ballast.
  • Figure 1 is a block diagram of the circuit of the present invention
  • Figure 2 is a circuit schematic diagram of the present invention
  • 3 is a block diagram of a circuit structure of an application example of the present invention
  • the high-voltage sodium lamp electronic ballast starting current limiting output circuit of the embodiment has a trigger circuit 1 and a starting circuit 2, the starting circuit 1 has two transformers T3 and ⁇ 4, and the trigger circuit 1 provides a starting circuit for the starting circuit 2.
  • Signal; two relays J1, J2 are connected between the two transformers ⁇ 3 and ⁇ 4 of the starting circuit 2, and the secondary coils of the two transformers are connected in series, and the two relays provide signals by a control circuit 3 after the starting circuit generates the ignition voltage.
  • An action occurs in which the primary coils acting as current limiting in the two transformers are converted from a series connection to a parallel connection. Referring to FIG.
  • the flip-flop circuit 1 is composed of resistors R34 to R36, R40 to R45, a capacitor C22, a bidirectional trigger diode DB3, and a thyristor Q6.
  • the resistors R40 to R44 are connected to form a voltage dividing circuit.
  • One end of the bidirectional trigger diode DB3 is connected to the control electrode of the thyristor Q6, and the other end is connected to the voltage dividing circuit.
  • the capacitor C22, the thyristor Q6 and the secondary windings of the transformers T3, ⁇ 4 are connected into a discharge loop, wherein the cathode of the thyristor Q6 is grounded.
  • the control circuit 3 is composed of an RS flip-flop U6 of the type CD4013 and its peripheral components, a transistor Q7, diodes D11 and D12, and relays J1 and J2.
  • the signal output terminal 1 of the RS flip-flop U6 is connected to the base of the transistor Q7, the emitter of the transistor Q7 is grounded, and the collector of the transistor Q7 is connected to the relay J1.
  • diodes D11 and D12 are connected in series, the anode of D11 is connected to a low voltage power supply of 15V, and the cathode of D12 is connected to relay J1 and RS flip-flop U6, respectively.
  • the RS flip-flop U6 can issue a control signal at a set time, control the relay J1 to operate, and then control the relay J2 to operate, so that the primary windings of the transformers T3 and ⁇ 4 are connected in series by parallel connection.
  • the start-up circuit 2 is composed of transformers ⁇ 3 and ⁇ 4.
  • the secondary windings of the transformers ⁇ 3 and ⁇ 4 are connected in series, and the primary windings of the transformers ⁇ 3 and ⁇ 4 are connected in series through the normally closed contacts of the relay J2; the normally open contacts of the relay J2 are connected to the load, and the primary coils of the transformer ⁇ 4 are closed when closed.
  • relay J1 The two normally closed contacts of relay J1 are suspended, one normally open contact of relay J1 is connected with the low voltage power supply, and the coil of relay J2 is energized when closed; the other normally open contact of relay J1 is connected with the transformer ⁇ 3 Primary coil connection, change when closed; The primary winding of the voltage converter T3 is turned on; one end of the coil of the relay J1 is connected to the low voltage power supply, and the other end of the coil of the relay J1 is connected to the collector of the transistor Q7 of the above control circuit.
  • a DC voltage signal of about 350V is generated on the sampling end of the start signal, and the voltage signal charges the capacitor C22 through the resistors R34, R35, and R36, and the voltage on the capacitor C22 is added through the secondary windings of T3 and ⁇ 4.
  • a voltage dividing circuit composed of resistors R40 to R44 divides the voltage on the capacitor C22.
  • a control signal, thyristor Q6 is turned on, at which point capacitor C22 is discharged to ground through the secondary windings of T3, ⁇ 4 and thyristor Q6. Since the equivalent resistance of the capacitor C22 discharge circuit is relatively small and the discharge current is relatively large, a large induced electromotive force is generated on the secondary winding of ⁇ 3, ⁇ , which is coupled to the primary windings of ⁇ 3, ⁇ 4, because ⁇ 3, ⁇ 4
  • the primary and secondary windings have a turns ratio of about 20: 1, so a high-voltage pulse of about 5KV will be generated on the primary windings of ⁇ 3 and ⁇ 4, and the high-pressure sodium lamp will be triggered to illuminate.
  • the C terminal is connected to the output of the high frequency conversion circuit.
  • the 15V DC voltage is applied to the positive pole of the diode D11, and the voltage is reduced by the diodes D1 l and D12 to obtain a DC voltage of about 13. 5V to supply power to the U6, the relay Jl, J2;
  • the output of pin 1 of U6 is low level, the transistor Q7 is cut off, and the relays Jl and J2 remain in the original state, and the primary windings of T3 and ⁇ 4 are connected in series; the power is turned on for about 6 seconds, U6 The output of pin 1 is high, and the transistor Q7 is turned on.
  • relay J1 is energized to start, J1's normally closed contact is open, normally open contact is closed, and the primary winding of ⁇ 4 is instantaneously short-circuited;
  • the normally open contact of J1 is closed, the coil of J2 is turned on, J2 is energized, the normally closed contact of J2 is open, the normally open contact is closed, and the primary winding of ⁇ 4 is turned on.
  • the primary windings of ⁇ 3 and ⁇ 4 are changed from the original series connection to the parallel connection.
  • the impedance of the output current limiting circuit drops to a quarter of the series connection, and the current drop through the primary windings of ⁇ 3 and ⁇ 4 is Use one-half of the connection in series.
  • the electronic ballast for the sodium lamp of the application example includes a filter circuit 1, a first rectifier circuit 2, a power factor correction circuit 3, a high frequency conversion circuit 4, a startup output current limiting circuit 5, and a filter.
  • a second rectifying circuit 9 is further connected between the circuit 1 and the low-voltage DC circuit 6.
  • the protection circuit 7 is respectively connected to the power factor correction circuit 3 and the PWM pulse control circuit 8, and the low-voltage DC circuit 6 and the power factor correction circuit 3 are respectively activated.
  • the current limiting circuit 5, the protection circuit 7, and the P-pulse control circuit 8 are connected.
  • the filter circuit 1 includes capacitors Cl, C2, C3, C4 and a high frequency inductor L1.
  • the filter circuit suppresses electromagnetic interference from the power grid, on the other hand, it suppresses interference from itself and other electrical appliances to the town of township to ensure that the power grid is free from pollution.
  • the first rectifier circuit 2 is composed of a bridge rectifier circuit KBU1 and a capacitor C5.
  • the second rectifier circuit 9 is constructed by connecting a bridge rectifier circuit KBU2 and a capacitor E3.
  • the power factor correction circuit 3 is an active power factor correction circuit composed of a model MC33262 power factor corrector U1 and its peripheral components, a transformer T1, a field effect transistor Q1, and a connection.
  • the high frequency conversion circuit 4 is composed of FETs Q4 and Q5, a transformer T2, capacitors C9 and C23, diodes D8, D9, D10, Z3, Z4, and Z5, resistors R28, R29, R30, and R31, and transistors Q2 and Q3. During operation, the FETs Q4 and Q5 are turned on in turn to provide high-frequency current for the load (high-pressure sodium lamp).
  • the low-voltage DC circuit 6 is composed of a photocoupler U3, a switching power supply single-chip U2 of the type T0P211Y, its peripheral components, and a transformer T5.
  • the second rectifying circuit 9 and the low-voltage DC circuit 6 have independent groundings from other circuits to prevent mutual interference with other circuits and ensure the stability of the output voltage of the low-voltage DC circuit.
  • the protection circuit 7 is composed of a four-op amp integrated circuit U4 of the type LM324 and its peripheral components.
  • the P-pulse control circuit 8 is composed of a voltage type PWM integrated controller U5 of the type SG3525A and its peripheral components.
  • the filter circuit 1 filters the voltage signal input by the power grid, and the filtered voltage signal is output to the first rectifier circuit 2 and the second rectifier circuit 9, respectively;
  • the first rectifier circuit 2 rectifies the input AC power, and rectifies
  • the subsequent signal is output to the power factor correction circuit 3;
  • the second rectifier circuit 9 rectifies the input alternating current, the rectified signal is output to the low voltage direct current circuit 6, the second rectifier circuit 9 has an independent ground, and the low voltage direct current circuit 6 inputs
  • the signal is converted to output a stable low voltage direct current to power the power factor correction circuit 3, the P pulse control circuit 8 and the active devices in the protection circuit 7.
  • the low voltage DC circuit 6 also provides a voltage signal for the startup output current limiting circuit 5.
  • the power factor correction circuit 3 converts the input signal, outputs a stable DC voltage, and supplies power to the high pressure sodium lamp through the high frequency conversion circuit 4.
  • the P-pulse control circuit 8 outputs a pulse signal and controls the high-frequency conversion circuit 4 to be turned on.
  • a start output current limiting circuit 5 is connected between the high frequency converting circuit 4 and the high pressure sodium lamp.
  • the two output terminals of the protection circuit 7 are respectively connected to the input terminals of the power factor correction circuit 3 and the pulse control circuit 8, and provide automatic protection for unexpected failure of the circuit to open or short.
  • the primary windings of the transformers T3 and ⁇ 4 that start the output current limiting circuit 5 start to be connected in series, and about 4 to 6 seconds after the bulb is triggered to light, the primary windings of the ⁇ 3 and ⁇ 4 are changed from the original series connection to the parallel connection. .
  • the series has a large inductance, so that the bulb can be reliably triggered to start, and the output power of the electronic ballast can also meet the requirements.
  • the bulbs become parallel after lighting, and the impedance drops to a quarter of the series connection in parallel, so that the temperature rise of ⁇ 3 and ⁇ 4 is controlled, and the temperature rise is at least 50% lower than the current limiting method connected in series.
  • the overall temperature rise of the electronic ballast is reduced by at least 30%, which greatly improves the performance stability and reliability of the electronic ballast.

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  • Circuit Arrangements For Discharge Lamps (AREA)

Description

高压钠灯电子镇流器启动输出限流电路
技术领域
本实用新型涉及电照明领域， 具体是用于放电灯点火、 控制的电路装置。 背景技术
高强度气体放电灯 （HID灯） 是用途极为广泛的新型节能型电光源， 已逐渐成 为公共场所及家庭照明的首选光源。 目前的电子镇流器的启动输出电路通常是釆用 变压器串联连接的方法， 如中国专利 ZL00246388. 1 公开了一种 "大功率高强度气 体放电灯用低成本电子镇流器"， 该电子镇流器的谐振输出电路由逆变电路、 振荡 启动电路及镇流点灯电路连接构成。 其中的镇流点灯电路由变压器 T2 及电容 C14 构成， 变压器 T2 由两个串联连接的主线圈及两个串联连接的副线圈构成。 变压器 T2产生谐振高频高压为金属卤化物灯提供启辉电压及镇流电压。金属卤化物灯触发 点亮之后， 变压器的初级绕组将作为限流线圈来扼制灯泡的电流变化， 使灯泡稳定 工作。 但目前电子镇流器产生的启辉电压一般只能达到 2000 至 3000V, 而如功率 400W以上的高压钠灯所需要的启动电压较高， 一般为 5KV以上， 所以一般电子镇流 器不能应用于如输出功率 400W 以上的高压钠灯。 由于起镇流作用的限流线圈串联 后阻抗较大， 因而变压器发热量大， 电子镇流器的稳定性和可靠性较差。 发明内容
本实用新型的目的是提供一种输出功率大、 发热量低、 性能稳定的高压钠灯电 子镇流器启动输出限流电路。 为实现本实用新型的目的， 本实用新型采用的技术方案是： 一种高压钠灯电子 镇流器启动输出限流电路，包括有触发电路和启动电路，启动电路具有两变压器 T3、 Τ4, 触发电路为启动电路提供启动信号； 启动电路的两变压器 Τ3、 Τ 之间还连接 有两继电器 Jl、 12, 上述两变压器中的次级线圈串联， 两继电器在启动电路产生启 辉电压后由一控制电路提供信号而发生动作， 使两变压器中起限流作用的初级线圈 由串联连接转换成并联连接。 所述的控制电路具有三极管 Q7和 RS触发器 U6; RS触发器 U6的信号输出端与 三极管 Q7的基极连接， 三极管 Q7的发射极接地， 三极管 Q7的集电极与继电器 J1 连接， 当三极管 Q7导通， 继电器 J1得电动作。 所述的启动电路的变压器 T3和 T4的初级绕组通过继电器 J2的常闭触点形成 串联连接；继电器 J2的常开触点与负载连接， 闭合时使变压器 T4的初级线圈导通； 继电器 J1的两个常闭触点悬空， 继电器 J1的一个常开触点与低压电源连接， 闭合 时使继电器 J2的线圈得电动作； 继电器 J1的另一个常开触点与变压器 T3的初级 线圈连接， 闭合时使变压器 T3的初级线圈导通； 继电器 J1的线圈的一端与低压电 源连接， 继电器 J1的线圈的另一端即与上述控制电路的三极管 Q7的集电极连接。 所述的继电器 J1与低压电源之间还设置有起降压作用的二极管 Dll、 D12。 所述的 RS触发器 U6的型号为 CD4013。 本上述技术方案相比现有技术具有以下优点： 本实用新型采用控制电路对变压器 T3、 Τ4 的初级绕组的连接方法进行控制， 在灯泡触发点前， Τ3、 Τ4的初级绕组为串联连接， 而且电感量比较大， 保证灯泡能 够可靠触发点亮。 当灯泡触发点亮后约 4〜6秒钟， 控制电路通过控制继电器 Jl、 J2进行转换， 将 T3、 Τ4的初级绕组由原来的串联连接变为并联连接。 这样， 一方 面使灯泡能够可靠的触发启动， 而且电子镇流器的输出功率也能够满足要求； 另一 方面， 并联后使阻抗下降为串联连接时的四分之一左右， Τ3、 Τ4的温升得到控制， 温升比普通的电感串联连接的限流方法至少下降 50%以上， 使电子镇流器的整体温 升至少下降 30%以上， 从而大大提高了电子镇流器的稳定性和可靠性。 附图说明
为了使本实用新型的内容更容易被清楚的理解， 下面根据的具体实施例并结合 附图， 对本实用新型作进一步详细的说明， 其中
图 1为本实用新型电路框图；
图 2为本实用新型的电路原理图； 图 3为本实用新型应用例的电路结构框图；
图 4为本实用新型应用例的电路原理图。 具体实施方式
实施例
见图 1及图 2， 本实施例的高压钠灯电子镇流器启动限流输出电路具有触发电 路 1和启动电路 2， 启动电路 1具有两变压器 T3、 Τ4， 触发电路 1为启动电路 2提 供启动信号； 启动电路 2的两变压器 Τ3、 Τ4之间还连接有两继电器 Jl、 J2, 上述 两变压器中的次级线圈串联， 两继电器在启动电路产生启辉电压后由一控制电路 3 提供信号而发生动作， 使两变压器中起限流作用的初级线圈由串联连接转换成并联 连接。 见图 2， 触发电路 1由电阻 R34〜R36、 R40〜R45、 电容 C22、 双向触发二极管 DB3、 晶闸管 Q6连接构成。 电阻 R40〜R44连接构成分压电路， 双向触发二极管 DB3 的一端与晶闸管 Q6的控制极连接， 另一端与分压电路连接。 电容 C22、 晶闸管 Q6 和变压器 T3、 Τ4的次级线圈连接成放电回路， 其中晶闸管 Q6的负极接地。 控制电路 3由型号为 CD4013的 RS触发器 U6及其外围元件、 三极管 Q7、 二极 管 Dll、 D12以及继电器 Jl、 J2连接构成。 RS触发器 U6的信号输出端 1脚与三极 管 Q7的基极连接，三极管 Q7的发射极接地，三极管 Q7的集电极与继电器 J1连接。 二极管 Dll、 D12串联后 D11的正极接 15V低压电源， D12的负极分别与继电器 J1 和 RS触发器 U6连接。 RS触发器 U6可在设定的时间发出控制信号， 控制继电器 J1 动作， 继而控制继电器 J2动作， 使变压器 T3、 Τ4的初级绕组由串联连接变成并联 连接。 启动电路 2由变压器 Τ3、 Τ4连接构成。 变压器 Τ3、 Τ4的次级绕组串联连接， 变压器 Τ3和 Τ4的初级绕组通过继电器 J2的常闭触点形成串联连接； 继电器 J2的 常开触点与负载连接， 闭合时使变压器 Τ4的初级线圈导通； 继电器 J1的两个常闭 触点悬空， 继电器 J1的一个常开触点与低压电源连接， 闭合时使继电器 J2的线圈 得电动作； 继电器 J1的另一个常开触点与变压器 Τ3的初级线圈连接， 闭合时使变 压器 T3的初级线圈导通； 继电器 J1的线圈的一端与低压电源连接， 继电器 J1的 线圈的另一端即与上述控制电路的三极管 Q7的集电极连接。 在接通电源后， 启动信号采样端 Α上产生约 350V的直流电压信号， 此电压信 号通过电阻 R34、 R35、 R36对电容 C22充电， 电容 C22上的电压经 T3、 Τ4的次级 绕组后加到晶闸管 Q6的阳极上， 电阻 R40〜R44组成的分压电路对电容 C22上的电 压进行分压， 当双向触发二极管 DB3上的电压到达转折电压时， DB3触发导通， 晶 闸管 Q6的控制极得到一个控制信号， 晶闸管 Q6导通， 这时电容 C22通过 T3、 Τ4 的次级绕组和晶闸管 Q6对地放电。 因为电容 C22放电回路的等效电阻比较小， 放 电电流比较大， 所以在 Τ3、 Τ 的次级绕组上产生了一个很大的感应电动势， 该感 应电动势耦合到 Τ3、 Τ4的初级绕组上， 因 Τ3、 Τ4的初、 次级绕组的匝比约为 20 : 1， 所以在 Τ3、 Τ4的初级绕组上将产生了一个 5KV左右的高压脉冲， 将高压钠灯灯 泡触发点亮。 从接通电源到灯泡点亮这个过程约 1秒钟左右。 灯泡点亮之后， 启动 信号釆样端 "Α"上的电压信号经电阻 R34、 R35、 灯泡、 T3、 Τ4的初级绕组到地形 成通路， 因电阻 R36的阻抗远大于灯泡、 Τ3、 Τ4的初级绕组的总阻抗， 电容 C22上 的电压经电阻 R40〜R44分压所得的电压再也不足以使 DB3触发导通， 晶闸管 Q6截 止， T3、 Τ4 的次级绕组基本上没有电流流过， Τ3、 Τ4 的初级绕组将不会再产生高 压脉冲。 C端与高频转换电路的输出端连接。 在接通电源的同时， 15V直流电压加到二极管 D11的正极， 经二极管 Dl l、 D12 降压后得到约 13. 5V的直流电压给 U6、 继电器 Jl、 J2供电； 在刚接通电源的 6秒 钟内， U6的第 1脚输出为低电平， 三极管 Q7截止， 继电器 Jl、 J2保持原始状态均 不动作， 此时 T3、 Τ4的初级绕组串联连接； 接通电源 6秒钟左右， U6的 1脚输出 为高电平， 三极管 Q7导通， 此时继电器 J1得电开始动作， J1的常闭触点断开， 常 开触点闭合， Τ4的初级绕组被瞬时短路； 在此同时因 J1的常开触点闭合， J2的线 圈接通， J2得电动作， J2的常闭触点断开， 常开触点闭合， Τ4的初级绕组接通。 至此， Τ3、 Τ4的初级绕组由原来的串联连接变成了并联连接， 变成并联连接后输出 限流电路的阻抗下降为串联连接的四分之一， 通过 Τ3、 Τ4 初级绕组的电流下降为 采用串联连接时的二分之一。这样一来，不但电子镇流器的输出功率可以做到 1000W 甚至 1000W以上， 而且使 Τ3、 Τ4的温升至少下降 50%以上， 使电子镇流器的整体温 升下降 30%以上， 从根本解决了大功率电子镇流器因温升过高而影响性能、 稳定性 和可靠性的问题。 应用例
见图 3， 本应用例的髙压钠灯电子镇流器包括有依次连接的滤波电路 1、 第一 整流电路 2、 功率因数校正电路 3、 高频变换电路 4、 启动输出限流电路 5， 滤波电 路 1与低压直流电路 6之间还连接有第二整流电路 9， 保护电路 7分别与功率因数 校正电路 3和 PWM脉冲控制电路 8相连， 低压直流电路 6分别与功率因数校正电路 3、 启动输出限流电路 5、 保护电路 7、 和 P丽脉冲控制电路 8相连。 见图 4， 滤波电路 1包括有电容 Cl、 C2、 C3、 C4以及高频电感 Ll。 其中，电容 C3、 C4的连接处接地。 滤波电路一方面抑制来自电网的电磁干扰， 另一方面抑制自 身和其它电器对镇流镇的干扰， 以保证电网不受污染。 第一整流电路 2是由桥式整流电路 KBU1和电容 C5连接构成。 第二整流电路 9都是桥式整流电路 KBU2和电容 E3连接构成。 功率因数校正电路 3是为有源功率因数校正电路， 由型号为 MC33262功率因数 校正器 U1及其外围元件、 变压器 Tl、 场效应管 Ql、 连接构成。 高频变换电路 4由场效应管 Q4、 Q5， 变压器 T2、 电容 C9、 C23、 二极管 D8、 D9、 D10, Z3、 Z4、 Z5， 电阻 R28、 R29、 R30、 R31、 三极管 Q2、 Q3连接构成。 工作 时， 场效应管 Q4、 Q5轮流导通， 为负载 （高压钠灯） 提供高频电流。
,
低压直流电路 6由光电耦合器 U3、 型号为 T0P211Y的开关电源单片机 U2及其 外围元件、 变压器 T5连接构成。 第二整流电路 9和低压直流电路 6具有区别与其 他电路的、 独立的接地， 防止与其他电路相互干扰， 保证低压直流电路输出电压的 稳定性。 保护电路 7由型号为 LM324的四运放集成电路 U4及其外围元件连接构成。
P丽脉冲控制电路 8由型号为 SG3525A的电压型 PWM集成控制器 U5及其外围元 件连接构成。 接通电源后， 滤波电路 1对电网输入的电压信号进行滤波， 滤波后的电压信号 分别输出到第一整流电路 2和第二整流电路 9 ; 第一整流电路 2对输入的交流电进 行整流， 整流后的信号输出到功率因数校正电路 3 ; 第二整流电路 9将输入的交流 电进行整流， 整流后的信号输出到低压直流电路 6， 第二整流电路 9具有独立的接 地， 低压直流电路 6将输入的信号进行转换， 输出一个稳定的低压直流电， 为功率 因数校正电路 3、 P觀脉冲控制电路 8以及保护电路 7中的有源器件供电。 低压直 流电路 6还为启动输出限流电路 5提供电压信号。 功率因数校正电路 3将输入信号 进行转换， 输出一个稳定的直流电压， 通过高频变换电路 4 给高压钠灯供电。 P丽 脉冲控制电路 8输出脉冲信号、 控制高频变换电路 4导通。 高频变换电路 4与高压 钠灯之间连接有启动输出限流电路 5。 保护电路 7的两个输出端分别与功率因数校 正电路 3和脉冲控制电路 8的输入端连接， 对电路发生开路或短路的意外故障起到 自动保护功能。 其中， 启动输出限流电路 5的变压器 T3、 Τ4的初级绕组开始为串联连接， 当 灯泡触发点亮后约 4〜6秒钟左右， Τ3、 Τ4的初级绕组由原来的串联连接变为并联 连接。 这样， 一方面， 串联后具有较大的电感量， 使灯泡能够可靠的触发启动， 而 且电子镇流器的输出功率也能够满足要求。 另一方面， 灯泡点亮后变成并联， 并联 后阻抗下降为串联连接时的四分之一， 使 Τ3、 Τ4 的温升得到控制， 温升比串联连 接的限流方法至少下降 50%以上， 电子镇流器的整体温升至少下降 30%以上， 从而 大大提高了电子镇流器的性能稳定性和可靠性。

Claims

权利要求：
1、 一种高压钠灯电子镇流器启动输出限流电路， 包括有触发电路和启动电路， 启动电路具有两变压器 T3、 Τ4, 触发电路为启动电路提供启动信号； 其特征在于： 启动电路的两变压器 Τ3、 Τ4之间还连接有两继电器 Jl、 J2, 上述两变压器中的次 级线圈串联， 两继电器在启动电路产生启辉电压后由一控制电路提供信号而发生动 作， 使两变压器中起限流作用的初级线圈由串联连接转换成并联连接。
2、 根据权利要求 1 所述的高压钠灯电子镇流器启动输出限流电路， 其特征在 于： 所述的控制电路具有三极管 Q7和 RS触发器 U6; RS触发器 U6的信号输出端与 三极管 Q7的基极连接， 三极管 Q7的发射极接地， 三极管 Q7的集电极与继电器 J1 连接， 当三极管 Q7导通， 继电器 J1得电动作。
3、 根据权利要求 2 所述的高压钠灯电子镇流器启动输出限流电路， 其特征在 于： 所述的启动电路的变压器 T3和 T4的初级绕组通过继电器 J2的常闭触点形成 串联连接；继电器 J2的常开触点与负载连接，闭合时使变压器 T4的初级线圈导通; 继电器 ji的两个常闭触点悬空， 继电器: Γ1的一个常开触点与低压电源连接， 闭合 时使继电器 J2的线圈得电动作； 继电器 J1的另一个常开触点与变压器 T3的初级 线圈连接， 闭合时使变压器 T3的初级线圈导通； 继电器 J1的线圈的一端与低压电 源连接， 继电器 J1的线圈的另一端即与上述控制电路的三极管 Q7的集电极连接。
4、 根据权利要求 3 所述的高压钠灯电子镇流器启动输出限流电路， 其特征在 于： 所述的继电器 J1与低压电源之间还设置有起降压作用的二极管 Dll、 D12。
5、 根据权利要求 2 所述的高压钠灯电子镇流器启动输出限流电路， 其特征在 于： 所述的 RS触发器 U6的型号为 CD4013o
PCT/CN2006/000158 2006-01-05 2006-01-26 Electronic ballast startup output current-limited circuit for high voltage sodium lamp WO2007076641A1 (en)

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