WO2011054164A1 - Switched mode power supply for plasma display and its starting circuit - Google Patents

Switched mode power supply for plasma display and its starting circuit Download PDF

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Publication number
WO2011054164A1
WO2011054164A1 PCT/CN2009/076379 CN2009076379W WO2011054164A1 WO 2011054164 A1 WO2011054164 A1 WO 2011054164A1 CN 2009076379 W CN2009076379 W CN 2009076379W WO 2011054164 A1 WO2011054164 A1 WO 2011054164A1
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WO
WIPO (PCT)
Prior art keywords
power supply
diode
electrically connected
triode
cathode
Prior art date
Application number
PCT/CN2009/076379
Other languages
French (fr)
Chinese (zh)
Inventor
唐蕾
姜运国
付金莲
Original Assignee
四川虹欧显示器件有限公司
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Filing date
Publication date
Application filed by 四川虹欧显示器件有限公司 filed Critical 四川虹欧显示器件有限公司
Publication of WO2011054164A1 publication Critical patent/WO2011054164A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/026—Arrangements or methods related to booting a display

Definitions

  • the invention relates to the field of power supplies, and in particular to a switching power supply for a plasma display and a startup circuit thereof.
  • a plasma display panel (PDP) is a display device that has been rapidly developed in recent years.
  • the color plasma display has become the first choice for large-screen display devices with its superior performance.
  • large-screen color plasma display devices have entered the market, especially the AC-type AC (Alternating Current)-PDP has the advantages of simple driving mode. Extensive research and application.
  • the power circuit plays an important role in the AC-PDP circuit system.
  • Power technology is a multidisciplinary edge-crossing technology that combines power conversion technology, modern electronic technology, and automatic control technology to apply power semiconductor devices.
  • electronic application technology people's requirements for electronic instruments and equipment are constantly increasing, requiring higher reliability, more functions, more automation, intelligence, and miniaturization.
  • switching power supply technology will become an important means to greatly save energy and improve production efficiency.
  • the startup circuit in the plasma display switching power supply provides operating voltage to the control integrated circuit (IC) and the power switch drive circuit during startup.
  • the power supply Vcc of the control IC chip used in the switching power supply of the color plasma display is generally about 5V, and the input voltage of most switching power supplies is much larger than the voltage, for example, more than 300V after the mains rectification, for the high-power switching power supply. It is also required to add a PFC (Power Factor Correction), and the voltage corrected by PFC is close to 400V. This high voltage cannot directly supply power to the chip.
  • the related art provides a high-power starting circuit that provides a low voltage and a small current to first operate the control IC.
  • the starting circuit in the related art has a large power consumption (1-5W) due to the starting resistor, so its bulk is large, which is disadvantageous to the small size and light weight of the power supply; and the starting resistor is always connected to the high voltage input terminal even if the switching power supply After normal operation, it is not disconnected from the high-voltage input terminal, so the starting resistor always consumes power, resulting in a large power consumption of the power supply and a low efficiency of the power supply.
  • a switching power supply starting circuit for a PDP including: a transistor Q1, a bias resistor R1, a Zener diode D3, and a second diode D2, wherein The collector (C pole) of Q1 is electrically connected to the high voltage input terminal Vin of the switching power supply of the PDP.
  • the base (B pole) of Q1 is electrically connected to the cathode of D3, and the emitter (E pole) of Q1 and the anode of D2 are electrically connected. Connection; R1 is connected between the collector and base of Q1; the anode of D3 is grounded; the cathode of D2 is electrically connected to the power input terminal Vcc of the control chip.
  • Q1 is an NPN transistor Q1.
  • a switching power supply for a PDP including: a starting circuit, a capacitor C1, a rectifying diode D1 and an auxiliary winding aux, and the starting circuit includes: a transistor Ql, Bias resistor R1, Zener diode D3 and second diode D2, wherein the collector (C pole) of Q1 is electrically connected to the high voltage input terminal Vin of the switching power supply of the PDP, and the base (B pole) and D3 of Q1 The cathode is electrically connected, the emitter (E pole) of Q1 is electrically connected to the anode of D2; R1 is connected between the collector and the base of Q1; the anode of D3 is grounded; the cathode of D2 is connected to the power input of the control chip Vcc Electrical connection.
  • the positive electrode of C1 is electrically connected to Vcc, the negative electrode of C1 is grounded; the cathode of D1 is electrically connected to the positive electrode of C1, and the anode of D1 is electrically connected to aux.
  • the switch tube ie, the transistor Q1 is used to control the start.
  • the switch Q1 When the auxiliary winding is not working normally, the switch Q1 is turned on, and the filter and the storage capacitor connected in parallel with Vcc are charged; When the voltage rises enough for the control chip to work, the power supply starts to work, the auxiliary winding outputs normally, the voltage rises, the condition that the switch Q1 is turned on is destroyed, the switch Q1 is automatically turned off, and the current through the start resistor (ie, the bias resistor R1) It is only the bias current of the Zener diode D3, which greatly reduces the power loss on the starting resistor, improves the efficiency of the power supply, reduces the size of the starting resistor, saves space, and facilitates the realization of the power supply.
  • the start resistor ie, the bias resistor R1
  • Fig. 1 is a circuit diagram showing a switching power supply according to a first embodiment of the present invention.
  • FIG. 1 is a circuit diagram of a switching power supply according to a first embodiment of the present invention, and a black frame at the left end of FIG. 1 shows a circuit diagram of a startup circuit portion including: a transistor Q1, a bias resistor R1, and a Zener diode D3.
  • a second diode D2 wherein the collector (C pole) of Q1 is electrically connected to the high voltage input terminal Vin of the switching power supply of the PDP, and the base (B pole) of Q1 is electrically connected to the cathode of D3, and the emitter of Q1 (E pole) is electrically connected to the anode of D2; R1 is connected between the collector and base of Q1; the anode of D3 is grounded; the cathode of D2 is electrically connected to the power input terminal Vcc of the control chip.
  • the switching transistor ie, the transistor Q1 is used to control the startup.
  • R1 When Vin is powered up, R1 provides a bias current for the Zener diode D3, and at the same time, after the Vbe and D2 of the Q1 are stepped down, the Vcc capacitor C1 is charged; When Vcc reaches a certain voltage, the control chip starts to work, a control pulse is issued, the power supply starts to work, and the voltage of the auxiliary winding will rise and supply power to the control chip.
  • the voltage on the Zener diode D3 is subtracted from the voltage drop on Vbe of V1 and the diode D2, so that D2 is turned off and Q1 is turned off.
  • D2 is also used to prevent the EB avalanche of Q1.
  • the startup resistor ie, the bias resistor R1
  • the bias resistor R1 is only a small bias current on the Zener diode D3, which greatly reduces the power loss on the startup resistor and improves the efficiency of the power supply.
  • Reduce the starting resistor volume (with 1/4W resistor can replace the large 1-5W in the related technology)
  • the power start resistor saves space and facilitates the compactness and light weight of the power supply. Therefore, the startup circuit of the related art is overcome in size, which is disadvantageous to the small size and light weight of the power supply. Moreover, the power consumption of the power supply is large, and the power efficiency is higher. Awkward questions.
  • Q1 is an NPN transistor Q1.
  • the switching power supply shown in Figure 1 includes: a starting circuit (as indicated by the black frame at the left end), a capacitor Cl, a rectifier diode D1 and an auxiliary winding aux, and the starting circuit includes: a transistor Q1, a bias resistor R1, a Zener diode D3 and a Two diodes D2, wherein the collector (C pole) of Q1 is electrically connected to the high voltage input terminal Vin of the switching power supply of the PDP, the base (B pole) of Q1 is electrically connected to the cathode of D3, and the emitter of Q1 (E The pole is electrically connected to the anode of D2; R1 is connected between the collector and the base of Q1; the anode of D3 is grounded; and the cathode of D2 is electrically connected to the power input terminal Vcc of the control chip.
  • a starting circuit as indicated by the black frame at the left end
  • the starting circuit includes: a transistor Q1, a bias resistor R1, a Zener dio
  • the switch tube ie, the transistor Q1
  • the switch Q1 is used to control the start.
  • the switch Q1 is turned on, and the filter and the storage capacitor connected in parallel with Vcc are charged; when the voltage of Vcc rises enough to allow control
  • the auxiliary winding outputs normally, the voltage rises, the condition that the switch Q1 is turned on is destroyed, the switch Q1 is automatically turned off, and the current through the starting resistor (ie, the bias resistor R1) is only the Zener diode D3.
  • a small bias current which greatly reduces the power loss on the starting resistor, improves the efficiency of the power supply, and reduces the starting resistor volume (a 1/4W resistor can replace the 1-5W in the related technology).
  • the power start resistor saves space and facilitates the compactness and light weight of the power supply. Therefore, the startup circuit of the related art is overcome in size, which is disadvantageous to the small size and light weight of the power supply. Moreover, the power consumption of the power supply is large, and the power efficiency is higher. Low problem.
  • the positive pole of C1 is electrically connected to Vcc, the negative pole of C1 is grounded, C1 is used for filtering and energy storage, and the voltage across the two ends is equal to the power supply voltage of the control chip; the cathode of the rectifier diode D1 and the positive pole of C1 Electrical connection, D1 anode and aux electrical connection, D1 limits the current flowing through the auxiliary winding aux can only be unidirectional, thus avoiding the voltage across C1 through the auxiliary winding path.
  • the above-mentioned embodiments of the present invention greatly reduce the power loss on the starting resistor, improve the efficiency of the power supply, and reduce the starting resistor volume, save space, and facilitate the small and light power supply. Quantify.
  • the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device so that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or Multiple modules or steps are made into a single integrated circuit module.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

Disclosed are a switched mode power supply for plasma display (PDP) and its starting circuit, the said starting circuit includes: a transistor Q1, a biasing resistance R1, a Zener diode D3 and the second diode D2, the collector of Q1 is electrically connected to the high-voltage input Vin of the switched mode power supply of the PDP, the base of Q1 is electrically connected to the cathode of D3, the emitter of Q1 is electrically connected to the anode of D2, R1 is bridging between the collector and the base of Q1, the anode of D3 is connected to the ground, and the cathode of D2 is electrically connected to the power input Vcc of the control IC.

Description

用于等离子显示器的开关电源及其启动电路 技术领域 本发明涉及电源领域， 具体而言， 涉及一种用于等离子显示器的开关电 源及其启动电路。 背景技术 彩色等离子体显示器（ Plasma Display Panel , 简称 PDP )是近几年来迅 速发展的一种显示器件。 彩色等离子体显示器以其优越的性能成为大屏幕显 示器件的首选， 目前大屏幕彩色等离子体显示器件已进入市场， 尤其是交流 型 AC ( Alternating Current, 交流） -PDP具有驱动方式简单等优点而获得广 泛的研究和应用。 电源电路在 AC-PDP电路系统中占有重要地位。电源技术是一种应用功 率半导体器件的综合了电力变换技术、 现代电子技术、 自动控制技术的多学 科的边缘交叉技术。 随着电子应用技术的迅速发展， 人们对电子仪器和设备 的要求不断提高， 要求其有更高的可靠性、 更多的功能、 更加自动化、 智能 化、 体积小型化。 在这种发展趋势下， 开关电源的优势日益明显， 其已成为 通信电力交通金融等行业的主要供电设备， 大有逐步取代中大功率线性调节 器形式直流电源的趋势。 开关电源技术将成为大幅度节约电能、 提高生产效 率的重要手段。 等离子体显示器开关稳压电源中的启动电路在启动过程中向控制集成 电路（Integrated Circuit, 简称 IC )和功率开关驱动电路提供工作电压。 由于 这部分电路所有输入和输出的功率都属于损耗， 因此在保证其所有功能的条 件下， 应尽可能提高它的效率。 彩色等离子显示器的开关电源中用到的控制 IC芯片的电源 Vcc—般在 5V左右， 而大多数开关电源的输入电压都远大于该电压， 比如市电整流后在 300V 以上， 对于大功率开关电源一般还要求再加一级 PFC ( Power Factor Correction, 功率因数校正）， 经 PFC校正后的电压接近 400V, 这种高压不 能直接向芯片供电。 相关技术中提供了一种大功率的启动电路，该启动电路提供低电压小电 流来先让控制 IC 工作， 当整个开关电源工作正常后转而由电源本身的辅助 绕组产生的电压给控制 IC供电。 发明人发现相关技术中的启动电路由于启动电阻的消耗功率（ 1-5W)较 大， 故其体积较大， 不利于电源的小型轻量化； 而且启动电阻与高压输入端 始终相连， 即使开关电源正常工作以后也并未与高压输入端断开， 故启动电 阻一直在消耗功率， 导致电源的功耗较大， 电源的效率较低。 发明内容 本发明旨在提供一种用于等离子显示器的开关电源及其启动电路，能够 解决相关技术中的启动电路体积较大， 不利于电源的小型轻量化； 而且电源 的功耗较大， 电源的效率较低的问题。 为了实现上述目的， 才艮据本发明的一个方面， 提供了一种用于 PDP的 开关电源启动电路， 包括： 三极管 Ql、 偏置电阻 Rl、 稳压二极管 D3与第 二二极管 D2, 其中， Q1的集电极（ C极） 与 PDP的开关电源的高压输入端 Vin电连接， Q1的基极 （ B极） 与 D3的阴极电连接， Q1的发射极（ E极） 与 D2的阳极电连接； R1跨接于 Q1的集电极与基极之间； D3的阳极接地； D2的阴极与控制芯片的电源输入端 Vcc电连接。 优选地， 在上述启动电路中， Q1为 NPN三极管 Ql。 为了实现上述目的， 才艮据本发明的另一方面， 还提供了一种用于 PDP 的开关电源， 包括： 启动电路、 电容 Cl、 整流二极管 D1与辅助绕组 aux, 启动电路包括： 三极管 Ql、 偏置电阻 Rl、稳压二极管 D3与第二二极管 D2, 其中， Q1的集电极 （C极） 与 PDP的开关电源的高压输入端 Vin电连接， Q1的基极（ B极） 与 D3的阴极电连接， Q1的发射极（ E极） 与 D2的阳极 电连接； R1跨接于 Q1的集电极与基极之间； D3的阳极接地； D2的阴极与 控制芯片的电源输入端 Vcc电连接。 优选地，在上述开关电源中， C1的正极与 Vcc电连接， C1的负极接地； D1的阴极与 C1的正极电连接， D1的阳极与 aux电连接。 上述实施例釆用开关管 （即三极管 Q1 ) 来控制启动， 当辅助绕组未正 常工作时， 开关 Q1开通， 与 Vcc并联的滤波兼储能电容得以充电； 当 Vcc 的电压上升到足以让控制芯片工作时， 电源开始工作， 辅助绕组正常输出， 电压抬升， 导致开关 Q1开通的条件被破坏， 开关 Q1 自动断开， 通过启动电 阻（即偏置电阻 R1 ) 的电流仅为稳压二极管 D3上很' j、的偏置电流， 进而大 幅降氏了启动电阻上的功率损耗， 提升了电源的效率， 而且减小了启动电阻 体积， 节省了空间， 便于实现电源的小型轻量化， 所以克服了相关技术中的 启动电路体积较大， 不利于电源的小型轻量化； 而且电源的功耗较大， 电源 的效率较低的问题。 附图说明 此处所说明的附图用来提供对本发明的进一步理解，构成本申请的一部 分， 本发明的示意性实施例及其说明用于解释本发明， 并不构成对本发明的 不当限定。 在附图中： 图 1示出了才艮据本发明第一实施例的开关电源的电路图。 具体实施方式 下面将参考附图并结合实施例， 来详细说明本发明。 图 1示出了根据本发明第一实施例的开关电源的电路图，图 1左端的黑 框示出了启动电路部分的电路图， 该启动电路包括： 三极管 Ql、 偏置电阻 Rl、 稳压二极管 D3与第二二极管 D2, 其中， Q1的集电极 （C极） 与 PDP 的开关电源的高压输入端 Vin电连接， Q1的基极（ B极） 与 D3的阴极电连 接， Q1的发射极（ E极）与 D2的阳极电连接； R1跨接于 Q1的集电极与基 极之间； D3的阳极接地； D2的阴极与控制芯片的电源输入端 Vcc电连接。 本实施例釆用开关管 （即三极管 Q1 ) 来控制启动， 当 Vin加电时， R1 为稳压二极管 D3提供偏置电流， 同时经 Q1 的 Vbe和 D2降压后， 给 Vcc 电容 C1充电； 当 Vcc到达一定的电压后， 控制芯片开始工作， 发出控制脉 冲， 电源开始工作， 辅助绕组的电压将会上升并给控制芯片供电。 通过合理 设计，使得稳压二极管 D3上的电压减去 Q1的 Vbe和二极管 D2上的压降后 使得 D2截止、 并使得 Q1关断， D2还用于防止出现 Q1的 E-B雪崩。 当 Q1 关断时， 通过启动电阻（即偏置电阻 R1 ) 的电流仅为稳压二极管 D3上很小 的偏置电流， 进而大幅降低了启动电阻上的功率损耗， 提升了电源的效率， 而且减小了启动电阻体积 （用 1/4W的电阻即可代替相关技术中 1-5W的大 功率启动电阻）， 节省了空间， 便于实现电源的小型轻量化， 所以克服了相关 技术中的启动电路体积较大， 不利于电源的小型轻量化； 而且电源的功耗较 大， 电源的效率较氐的问题。 优选地， 在上述启动电路中， Q1为 NPN三极管 Ql。 由于娃材料的热 稳定性较好，因而 NPN型三极管的工作可靠性较高，所以本实施例釆用 NPN 三极管作为开关管 Ql。 如图 1所示的开关电源包括： 启动电路（如左端黑框所示）、 电容 Cl、 整流二极管 D1与辅助绕组 aux, 启动电路包括： 三极管 Ql、 偏置电阻 Rl、 稳压二极管 D3与第二二极管 D2, 其中， Q1的集电极 （ C极） 与 PDP的开 关电源的高压输入端 Vin电连接， Q1的基极（ B极） 与 D3的阴极电连接， Q1的发射极（ E极）与 D2的阳极电连接； R1跨接于 Q1的集电极与基极之 间； D3的阳极接地； D2的阴极与控制芯片的电源输入端 Vcc电连接。 本实施例釆用开关管 （即三极管 Q1 ) 来控制启动， 当辅助绕组未正常 工作时， 开关 Q 1开通， 与 Vcc并联的滤波兼储能电容得以充电； 当 Vcc的 电压上升到足以让控制芯片工作时， 电源开始工作， 辅助绕组正常输出， 电 压抬升， 导致开关 Q1开通的条件被破坏， 开关 Q1 自动断开， 通过启动电阻 (即偏置电阻 R1 ) 的电流仅为稳压二极管 D3上很小的偏置电流， 进而大幅 降氐了启动电阻上的功率损耗， 提升了电源的效率， 而且减小了启动电阻体 积 （用 1/4W的电阻即可代替相关技术中 1-5W的大功率启动电阻）， 节省了 空间， 便于实现电源的小型轻量化， 所以克服了相关技术中的启动电路体积 较大， 不利于电源的小型轻量化； 而且电源的功耗较大， 电源的效率较低的 问题。 优选地，在上述开关电源中， C1的正极与 Vcc电连接， C1的负极接地， C1用于滤波与储能， 其两端电压等于控制芯片的电源电压； 整流二极管 D1 的阴极与 C1的正极电连接， D1的阳极与 aux电连接， D1限制了流过辅助 绕组 aux的电流只能为单向， 从而避免了 C1 两端的电压通过 助绕组的通 路进行放电。 从以上的描述中， 可以看出， 本发明上述的实施例大幅降低了启动电阻 上的功率损耗， 提升了电源的效率， 而且减小了启动电阻体积， 节省了空间， 便于实现电源的小型轻量化。 显然， 本领域的技术人员应该明白， 上述的本发明的各模块或各步骤可 以用通用的计算装置来实现， 它们可以集中在单个的计算装置上， 或者分布 在多个计算装置所组成的网络上， 可选地， 它们可以用计算装置可执行的程 序代码来实现， 从而可以将它们存储在存储装置中由计算装置来执行， 或者 将它们分别制作成各个集成电路模块， 或者将它们中的多个模块或步骤制作 成单个集成电路模块来实现。 这样， 本发明不限制于任何特定的硬件和软件 结合。 以上所述仅为本发明的优选实施例而已， 并不用于限制本发明， 对于本 领域的技术人员来说， 本发明可以有各种更改和变化。 凡在本发明的 ^"神和 原则之内， 所作的任何修改、 等同替换、 改进等， 均应包含在本发明的保护 范围之内。 BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to the field of power supplies, and in particular to a switching power supply for a plasma display and a startup circuit thereof. BACKGROUND OF THE INVENTION A plasma display panel (PDP) is a display device that has been rapidly developed in recent years. The color plasma display has become the first choice for large-screen display devices with its superior performance. At present, large-screen color plasma display devices have entered the market, especially the AC-type AC (Alternating Current)-PDP has the advantages of simple driving mode. Extensive research and application. The power circuit plays an important role in the AC-PDP circuit system. Power technology is a multidisciplinary edge-crossing technology that combines power conversion technology, modern electronic technology, and automatic control technology to apply power semiconductor devices. With the rapid development of electronic application technology, people's requirements for electronic instruments and equipment are constantly increasing, requiring higher reliability, more functions, more automation, intelligence, and miniaturization. Under this development trend, the advantages of switching power supply are becoming more and more obvious. It has become the main power supply equipment for communication power transportation finance and other industries, and there is a tendency to gradually replace the DC power supply in the form of medium and large power linear regulators. Switching power supply technology will become an important means to greatly save energy and improve production efficiency. The startup circuit in the plasma display switching power supply provides operating voltage to the control integrated circuit (IC) and the power switch drive circuit during startup. Since all of the input and output power of this part of the circuit is lossy, its efficiency should be maximized while ensuring all its functions. The power supply Vcc of the control IC chip used in the switching power supply of the color plasma display is generally about 5V, and the input voltage of most switching power supplies is much larger than the voltage, for example, more than 300V after the mains rectification, for the high-power switching power supply. It is also required to add a PFC (Power Factor Correction), and the voltage corrected by PFC is close to 400V. This high voltage cannot directly supply power to the chip. The related art provides a high-power starting circuit that provides a low voltage and a small current to first operate the control IC. When the entire switching power supply is working normally, the voltage generated by the auxiliary winding of the power supply itself is supplied to the control IC. . The inventors have found that the starting circuit in the related art has a large power consumption (1-5W) due to the starting resistor, so its bulk is large, which is disadvantageous to the small size and light weight of the power supply; and the starting resistor is always connected to the high voltage input terminal even if the switching power supply After normal operation, it is not disconnected from the high-voltage input terminal, so the starting resistor always consumes power, resulting in a large power consumption of the power supply and a low efficiency of the power supply. SUMMARY OF THE INVENTION The present invention is directed to a switching power supply for a plasma display and a startup circuit thereof, which can solve the problem that the startup circuit in the related art is large in size, which is disadvantageous to the small size and light weight of the power supply; The problem of lower efficiency. In order to achieve the above object, according to an aspect of the present invention, a switching power supply starting circuit for a PDP is provided, including: a transistor Q1, a bias resistor R1, a Zener diode D3, and a second diode D2, wherein The collector (C pole) of Q1 is electrically connected to the high voltage input terminal Vin of the switching power supply of the PDP. The base (B pole) of Q1 is electrically connected to the cathode of D3, and the emitter (E pole) of Q1 and the anode of D2 are electrically connected. Connection; R1 is connected between the collector and base of Q1; the anode of D3 is grounded; the cathode of D2 is electrically connected to the power input terminal Vcc of the control chip. Preferably, in the above startup circuit, Q1 is an NPN transistor Q1. In order to achieve the above object, according to another aspect of the present invention, a switching power supply for a PDP is provided, including: a starting circuit, a capacitor C1, a rectifying diode D1 and an auxiliary winding aux, and the starting circuit includes: a transistor Ql, Bias resistor R1, Zener diode D3 and second diode D2, wherein the collector (C pole) of Q1 is electrically connected to the high voltage input terminal Vin of the switching power supply of the PDP, and the base (B pole) and D3 of Q1 The cathode is electrically connected, the emitter (E pole) of Q1 is electrically connected to the anode of D2; R1 is connected between the collector and the base of Q1; the anode of D3 is grounded; the cathode of D2 is connected to the power input of the control chip Vcc Electrical connection. Preferably, in the above switching power supply, the positive electrode of C1 is electrically connected to Vcc, the negative electrode of C1 is grounded; the cathode of D1 is electrically connected to the positive electrode of C1, and the anode of D1 is electrically connected to aux. In the above embodiment, the switch tube (ie, the transistor Q1) is used to control the start. When the auxiliary winding is not working normally, the switch Q1 is turned on, and the filter and the storage capacitor connected in parallel with Vcc are charged; When the voltage rises enough for the control chip to work, the power supply starts to work, the auxiliary winding outputs normally, the voltage rises, the condition that the switch Q1 is turned on is destroyed, the switch Q1 is automatically turned off, and the current through the start resistor (ie, the bias resistor R1) It is only the bias current of the Zener diode D3, which greatly reduces the power loss on the starting resistor, improves the efficiency of the power supply, reduces the size of the starting resistor, saves space, and facilitates the realization of the power supply. Small and lightweight, it overcomes the large size of the startup circuit in the related art, which is not conducive to the small size and light weight of the power supply; and the power consumption of the power supply is large, and the efficiency of the power supply is low. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: Fig. 1 is a circuit diagram showing a switching power supply according to a first embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings in conjunction with the embodiments. 1 is a circuit diagram of a switching power supply according to a first embodiment of the present invention, and a black frame at the left end of FIG. 1 shows a circuit diagram of a startup circuit portion including: a transistor Q1, a bias resistor R1, and a Zener diode D3. And a second diode D2, wherein the collector (C pole) of Q1 is electrically connected to the high voltage input terminal Vin of the switching power supply of the PDP, and the base (B pole) of Q1 is electrically connected to the cathode of D3, and the emitter of Q1 (E pole) is electrically connected to the anode of D2; R1 is connected between the collector and base of Q1; the anode of D3 is grounded; the cathode of D2 is electrically connected to the power input terminal Vcc of the control chip. In this embodiment, the switching transistor (ie, the transistor Q1) is used to control the startup. When Vin is powered up, R1 provides a bias current for the Zener diode D3, and at the same time, after the Vbe and D2 of the Q1 are stepped down, the Vcc capacitor C1 is charged; When Vcc reaches a certain voltage, the control chip starts to work, a control pulse is issued, the power supply starts to work, and the voltage of the auxiliary winding will rise and supply power to the control chip. Through reasonable design, the voltage on the Zener diode D3 is subtracted from the voltage drop on Vbe of V1 and the diode D2, so that D2 is turned off and Q1 is turned off. D2 is also used to prevent the EB avalanche of Q1. When Q1 is turned off, the current through the startup resistor (ie, the bias resistor R1) is only a small bias current on the Zener diode D3, which greatly reduces the power loss on the startup resistor and improves the efficiency of the power supply. Reduce the starting resistor volume (with 1/4W resistor can replace the large 1-5W in the related technology) The power start resistor) saves space and facilitates the compactness and light weight of the power supply. Therefore, the startup circuit of the related art is overcome in size, which is disadvantageous to the small size and light weight of the power supply. Moreover, the power consumption of the power supply is large, and the power efficiency is higher. Awkward questions. Preferably, in the above startup circuit, Q1 is an NPN transistor Q1. Since the thermal stability of the silicon material is good, the operational reliability of the NPN transistor is high, so in this embodiment, the NPN transistor is used as the switching transistor Q1. The switching power supply shown in Figure 1 includes: a starting circuit (as indicated by the black frame at the left end), a capacitor Cl, a rectifier diode D1 and an auxiliary winding aux, and the starting circuit includes: a transistor Q1, a bias resistor R1, a Zener diode D3 and a Two diodes D2, wherein the collector (C pole) of Q1 is electrically connected to the high voltage input terminal Vin of the switching power supply of the PDP, the base (B pole) of Q1 is electrically connected to the cathode of D3, and the emitter of Q1 (E The pole is electrically connected to the anode of D2; R1 is connected between the collector and the base of Q1; the anode of D3 is grounded; and the cathode of D2 is electrically connected to the power input terminal Vcc of the control chip. In this embodiment, the switch tube (ie, the transistor Q1) is used to control the start. When the auxiliary winding is not working normally, the switch Q1 is turned on, and the filter and the storage capacitor connected in parallel with Vcc are charged; when the voltage of Vcc rises enough to allow control When the chip is working, the power supply starts to work, the auxiliary winding outputs normally, the voltage rises, the condition that the switch Q1 is turned on is destroyed, the switch Q1 is automatically turned off, and the current through the starting resistor (ie, the bias resistor R1) is only the Zener diode D3. A small bias current, which greatly reduces the power loss on the starting resistor, improves the efficiency of the power supply, and reduces the starting resistor volume (a 1/4W resistor can replace the 1-5W in the related technology). The power start resistor) saves space and facilitates the compactness and light weight of the power supply. Therefore, the startup circuit of the related art is overcome in size, which is disadvantageous to the small size and light weight of the power supply. Moreover, the power consumption of the power supply is large, and the power efficiency is higher. Low problem. Preferably, in the above switching power supply, the positive pole of C1 is electrically connected to Vcc, the negative pole of C1 is grounded, C1 is used for filtering and energy storage, and the voltage across the two ends is equal to the power supply voltage of the control chip; the cathode of the rectifier diode D1 and the positive pole of C1 Electrical connection, D1 anode and aux electrical connection, D1 limits the current flowing through the auxiliary winding aux can only be unidirectional, thus avoiding the voltage across C1 through the auxiliary winding path. From the above description, it can be seen that the above-mentioned embodiments of the present invention greatly reduce the power loss on the starting resistor, improve the efficiency of the power supply, and reduce the starting resistor volume, save space, and facilitate the small and light power supply. Quantify. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device so that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

权 利 要 求 书 一种用于等离子显示器的开关电源启动电路， 其特征在于， 包括： 三 极管、 偏置电阻、 稳压二极管与第二二极管， 其中， A switching power supply starting circuit for a plasma display, comprising: a triode, a bias resistor, a Zener diode, and a second diode, wherein
所述三极管的集电极与等离子显示器的开关电源的高压输入端电 连接， 所述三极管的基极与所述稳压二极管的阴极电连接， 所述三极管 的发射极与所述第二二极管的阳极电连接；  The collector of the triode is electrically connected to the high voltage input end of the switching power supply of the plasma display, the base of the triode is electrically connected to the cathode of the Zener diode, and the emitter of the triode and the second diode Anode electrical connection;
所述偏置电阻跨接于所述三极管的集电极与基极之间；  The bias resistor is connected across the collector and the base of the transistor;
所述稳压二极管的阳极接地；  The anode of the Zener diode is grounded;
所述第二二极管的阴极与控制芯片的电源输入端电连接。 根据权利要求 1所述的开关电源启动电路， 其特征在于， 所述三极管 为 NPN三极管。 一种用于等离子显示器的开关电源， 其特征在于， 包括： 启动电路、 电容、 整流二极管与辅助绕组， 所述启动电路包括： 三极管、 偏置电 阻、 稳压二极管与第二二极管， 其中，  The cathode of the second diode is electrically coupled to a power input of the control chip. The switching power supply starting circuit according to claim 1, wherein said triode is an NPN transistor. A switching power supply for a plasma display, comprising: a starting circuit, a capacitor, a rectifying diode and an auxiliary winding, the starting circuit comprising: a triode, a bias resistor, a Zener diode and a second diode, wherein ,
所述三极管的集电极与等离子显示器的开关电源的高压输入端电 连接， 所述三极管的基极与所述稳压二极管的阴极电连接， 所述三极管 的发射极与所述第二二极管的阳极电连接；  The collector of the triode is electrically connected to the high voltage input end of the switching power supply of the plasma display, the base of the triode is electrically connected to the cathode of the Zener diode, and the emitter of the triode and the second diode Anode electrical connection;
所述偏置电阻跨接于所述三极管的集电极与基极之间；  The bias resistor is connected across the collector and the base of the transistor;
所述稳压二极管的阳极接地；  The anode of the Zener diode is grounded;
所述第二二极管的阴极与控制芯片的电源输入端电连接。 根据权利要求 3所述的开关电源， 其特征在于，  The cathode of the second diode is electrically coupled to a power input of the control chip. A switching power supply according to claim 3, characterized in that
所述电容的正极与所述控制芯片的电源输入端电连接，所述电容的 负极接地；  The positive pole of the capacitor is electrically connected to the power input end of the control chip, and the negative pole of the capacitor is grounded;
所述整流二极管的阴极与所述电容的正极电连接，所述整流二极管 的阳极与所述辅助绕组电连接。  A cathode of the rectifier diode is electrically coupled to a positive terminal of the capacitor, and an anode of the rectifier diode is electrically coupled to the auxiliary winding.
PCT/CN2009/076379 2009-11-03 2009-12-31 Switched mode power supply for plasma display and its starting circuit WO2011054164A1 (en)

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