WO2009089665A1 - Dispositif de protection pour un circuit d'alimentation avec une double puissance positive et négative - Google Patents

Dispositif de protection pour un circuit d'alimentation avec une double puissance positive et négative Download PDF

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Publication number
WO2009089665A1
WO2009089665A1 PCT/CN2008/000548 CN2008000548W WO2009089665A1 WO 2009089665 A1 WO2009089665 A1 WO 2009089665A1 CN 2008000548 W CN2008000548 W CN 2008000548W WO 2009089665 A1 WO2009089665 A1 WO 2009089665A1
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WIPO (PCT)
Prior art keywords
capacitor
positive
negative
power supply
output
Prior art date
Application number
PCT/CN2008/000548
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English (en)
French (fr)
Inventor
Jun Dai
Original Assignee
Shenzhen Skyworth-Rgb Electronic Co., Ltd
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Publication date
Application filed by Shenzhen Skyworth-Rgb Electronic Co., Ltd filed Critical Shenzhen Skyworth-Rgb Electronic Co., Ltd
Priority to EP08715001A priority Critical patent/EP2178184A4/en
Priority to DE200811003622 priority patent/DE112008003622T5/de
Publication of WO2009089665A1 publication Critical patent/WO2009089665A1/zh
Priority to US12/694,045 priority patent/US8159799B2/en

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/52—Circuit arrangements for protecting such amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/30—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor
    • H03F3/3069—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor the emitters of complementary power transistors being connected to the output
    • H03F3/3076—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor the emitters of complementary power transistors being connected to the output with symmetrical driving of the end stage
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/444—Diode used as protection means in an amplifier, e.g. as a limiter or as a switch

Definitions

  • This innovation mainly involves the field of consumer electronics, especially in the field of television and audio technology. Background technique
  • OCL sound amplifiers and color electric field scanning circuits Existing circuits that require positive and negative symmetric dual power supply, the most common are OCL sound amplifiers and color electric field scanning circuits.
  • the OCL power amplifier circuit without output coupling capacitors has a higher damage rate than the OTL power amplifier circuit with output coupling capacitors.
  • the hazard is large. Because the OTL power amplifier circuit is damaged, it is difficult to burn the rear load due to the blocking coupling capacitance.
  • the OCL circuit needs to add a protection circuit when an abnormality occurs.
  • the prior art OCL circuit especially the color electric field output stage circuit, although some people have added abnormal protection, the circuit is complicated, and the prior art is only effective for one of the load short-circuit when the load of the positive and negative dual power sources is unbalanced. . That is: only a single positive power supply load short circuit or a negative power supply load short circuit is effective, and it is abnormally invalid when the positive power supply load or the negative power supply load is short-circuited at the same time or other balance is symmetrical.
  • the OCL circuit is abnormal. In most cases, the power integrated device is not damaged by itself, but the external components first cause abnormal overload, and then the power integrated device is damaged, and then the chain continues to expand other faults. Such as: burning speakers, burning picture tubes, etc.
  • an abnormal protection device for positive and negative dual power supply circuits is provided with an overload or other abnormal protection device, which is characterized in that: in the dual-supply OCL power circuit, the output of the rear-stage output (RL) circuit is added or The series current negative feedback resistor R371 is used as the detection source, and the resistor R46V and
  • the capacitor C46V is integrated, it is connected to the normal shutdown and overload conduction overload shutdown device via the voltage sensitive switch device VD46 branch or diode D46 branch, thereby achieving overcurrent or other abnormal protection of the OCL circuit with positive and negative dual power supply. .
  • the circuit is simple and reliable, timely and accurate protection, can effectively prevent re-chaining and expand other faults.
  • OCL audio amplifiers and field scan output stages that use positive and negative dual power supplies, if the damage caused by the peripheral components of the integrated block is not, the overcurrent or other abnormal protection can be obtained in time. Not only can it effectively prevent the damage of the integrated block or the like which is not damaged. It also prevents damage to rear-stage loads (eg, speakers, deflection yokes, kinescopes, etc.).
  • the drawing of the manual has 2 pages of 2 pages. [The drawing is derived from the schematic diagram corresponding to the actual realization of the specific printed circuit board (PCB) of the color TV product. Specialized descriptions using partial magnification items].
  • the drawings, the function name, the component number, and the component parameters or the substitution range after the combination of the components, the drawings are respectively marked with different fonts, which can be easily distinguished. In particular, there are a number of components connected to create a certain function. Use the dotted line of the box to increase the numerical number or entropy of the font, which is more convenient for explanation.
  • the drawings seek to detail specific embodiments of the essential features associated with this innovation.
  • FIG. 1 is the main point of the innovative technical solution;
  • FIG. 2 is a specific embodiment of the innovative technology and the circuit that must be involved in the overload shutdown device;
  • FIG. 3 is to change the overcurrent detection resistor R371 from the positive and negative power supply. After sampling with two equal-value divider resistors, it is a specific embodiment of the detection source;
  • Figure 4 is the automatic current negative feedback gain control when the output signal is too large;
  • Figure 5 is the automatic shutdown circuit when the output signal is too large; 7 or
  • Figure 8 is the total average current at the input
  • the load protection circuit is also an embodiment of an overcurrent protection circuit that prevents the respective loads of the positive and negative dual power sources from being damaged at the same time.
  • FIG. 1 is the main point of the innovative technical solution;
  • FIG. 2 is a specific embodiment of the innovative technology and the circuit that must be involved in the overload shutdown device;
  • FIG. 3 is to change the overcurrent detection resistor R371 from the positive and negative power supply. After sampling with two equal-value divider
  • FIG 8 is a specific embodiment of the FBT secondary power distribution and overload shutdown device of the innovative color TV flyback transformer.
  • Figure 9 and Figure 10 are examples of transformer T (especially color TV switch transformer T) or flyback transformer FBT secondary generating positive and negative dual power supplies from a set of windings and switching to a single-supply 26V power supply scheme for OTL power supply.
  • the figures are all tube diagrams abstracted from Figure 8.
  • the common end of the cold-bottom (circuit) board, which is not involved in the grid, is represented by " ⁇ ", (or other marks, etc.), and the common end of the winding of the switching power supply transformer T or the common end of the winding of the flyback transformer FBT is used respectively.
  • ⁇ GND, and ⁇ GND2 mark.
  • Different drawings contain the same mark, have the same object, and have the same function or performance.
  • Vcc can refer to any power supply high potential end, sometimes to distinguish different Vcc, use 5V
  • Different power supply markings such as -1, 12V-1, ⁇ 13V, 26V, etc., can be any different power supply voltage values that can be required. In the same figure, except for Vcc, the same reference numerals can be connected.
  • Vcc can refer to any power supply high potential end, can be different power supply voltage values, except Vcc in the same figure,
  • the same reference numerals can be connected to each other. The functions of each figure are described in detail below.
  • positive path rectification means that the secondary of the pulse transformer passes through the series diode rectification circuit and is the same polarity rectification filter circuit as the original coil on/off.
  • Reverse-pass rectification means the secondary of the pulse transformer.
  • the series-connected diode rectification circuit is a reverse-polar rectification filter circuit that is opposite to the original coil on/off.
  • the innovative positive and negative dual power supply circuit abnormal protection device adding overload or other abnormal protection device, in the dual-supply OCL power circuit rear-stage output load (RL) circuit, add or use series current
  • the negative feedback resistor R371 is used as the detection source, and then integrated by the resistor R46V and the capacitor C46V, and then connected to the normal shutdown shutdown and overload conduction overload shutdown device via the voltage sensitive switch device VD46 branch or the diode D46 branch.
  • Negative dual-supply OCL circuit overcurrent or Other abnormal protection When the normal state or load balance is symmetrical, the voltage across the capacitor C46V is equal and opposite in direction, and the voltage after integration is zero.
  • the capacitance C46V integral occurs when the abnormal state occurs.
  • the voltage-sensitive switching device such as diode D46 or voltage regulator VD46
  • the shutdown device can achieve overcurrent or other abnormal protection of the OCL circuit with positive and negative dual power supply.
  • the two equal value divider resistors in the positive and negative dual power sources are sampled and used as the detection source.
  • the positive and negative dual power supplies VCC and -VCC are asymmetric in voltage, they can be used as protection against severe overcurrent.
  • the abnormal protection effect is not as good as the example scheme of Figure 1 or Figure 2, because the positive and negative dual current output voltages are often equal in magnitude and opposite in direction, and the internal resistance of the power supply is small.
  • a preferred embodiment is applied as a color TV.
  • line scan circuit (6) and flyback transformer FBT (20), and its back-scanning transformer FBT secondary winding power distribution circuit (20A), overload shutdown device (15), automatic brightness, automatic contrast and automatic line width circuit ( 21) It is composed of a CRT board ground wire and an anti-high voltage sparking/antistatic device (44G), etc., and a dynamic focus circuit (21F) can be added (or removed).
  • the overload shutdown device ( 15 ) can be used directly in all fields of electronics and electrical appliances.
  • the voltage across the capacitor C26 is connected to the capacitors C21, C371 and the capacitor (C-13V) in series, and the voltage load across the capacitor C21 is large, and has a clamping effect, through the capacitors C21, C371 positive terminal and capacitor (C-13V)
  • the negative terminal is supplied to the OCL field output stage as a positive and negative dual supply.
  • the positive and negative dual power supply overload protection scheme is: When the load of the capacitor C2K C 7 l is overloaded (ie: OCL upper tube), the voltage drop can be directly generated by the overcurrent detecting resistor RF 2 , and integrated by the resistor R46F capacitor C46F.
  • the innovation of the negative voltage source load overcurrent protection scheme is: Indirect protection, first force the other line of the forward-range rectifying capacitor C21 adjacent to the adjacent filter to increase the voltage 13V, and achieve its own over-current conversion to other Overvoltage rises the purpose of plug-in shutdown, this innovation is the optimal overload protection scheme for OCL field output circuit, because this scheme can not only prevent positive and negative
  • the overcurrent protection circuit with the simultaneous damage of the dual power supply is also the average current overload protection circuit of the total input and output of the positive and negative dual power supplies, and is common to all circuits such as OCL and OTLs BTL. And there is almost no added cost, and the highest reliability and accuracy are protected in time. Specific product examples are shown in Figure 8 for an example.
  • the transformer T/FBT sub-set of independent line ⁇ can switch between five different voltages through different connection relationships of light J13V, J-13V and J928 respectively.
  • Figure 9 output (reverse-rectification) 205V, (positive-way rectification) positive and negative 13V three sets of voltage; flyback transformer FBT reverse-way rectification The voltage is about 7.5 times the forward rectification voltage. If the light J13V, J-13V is removed, the negative end of the capacitor C26 is directly passed through the light.
  • J928 is connected to the ground GND2 of the transformer T/FBT to output two sets of voltages of 218V and +26V. See Figure 8 for an example of a 26V power distribution distribution diagram for a single-supply power supply suitable for OTL power supply, as summarized in Figure 8.
  • CPU power supply terminal number 5V-1 can be 5V, 3.3V, 1.8V, etc.
  • the power supply terminal number 13V can be about 12V.
  • some tag components, such as: resistors, etc. can be changed to diodes and the like or other components.
  • a series current negative feedback resistor R371 is added or used as a detection source, and then integrated through the resistor R46V and the capacitor C46V, and then The voltage-sensitive switching device VD46 or the diode D46 branch is connected to the normally-off, overload-on overload shutdown device, thereby implementing over-current of the positive-negative dual-supply OCL circuit or Other abnormalities are effectively protected in a timely manner.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Protection Of Static Devices (AREA)
  • Emergency Protection Circuit Devices (AREA)

Description

正负双电源供电电路的异常保护装置 技术领域
本创新主要涉及消费性电子产品领域， 特别涉及电视、 音响技术领域。 背景技术
现有的需正负对称双电源供电的电路， 最常见的是 OCL伴音功放和彩电场 扫描电路， 这种无输出耦合电容的 OCL功放电路， 比有输出耦合电容的 OTL功 率放大电路损坏率和危害性要大， 因为 OTL功率放大电路损坏时， 因有隔直耦 合电容， 所以不易烧毁后级负载。 而 OCL电路损坏时， 不仅易烧毁后级负载， 还会连锁扩大其他故障， 如： 烧音箱、烧显象管管颈、烧坏变压器等。 所以 OCL 电路需要增设异常时的保护电路。 已有技术 OCL电路， 特别是彩电场输出级电 路， 虽然也有人增设异常保护， 但电路复杂， 且已有技术仅对正负双电源各自 负荷中不平衡时， 仅对其中之一负载短路有效。 即： 仅单一对正电源负荷短路 或负电源负荷短路有效， 对正电源负荷或负电源负荷同时短路或其它平衡对称 时异常无效。 然而， OCL电路异常， 多数情况下， 采用功率集成器件原先本身 并不损坏， 但是由于其外围元件先引起异常过载， 然后才引起功率集成器件损 坏， 再继续连锁扩大其他故障。 如： 烧音箱、 烧显象管等。 但是已有技术， 还 未有在功率集成块损坏前， 原先异常状态刚发生时， 能及时有效地保护， 不至 于再扩大烧毁功率集成块和后级负载方案。 能否创新最初由集成功率器件 IC外 围元件先引起异常时但集成功率器件 IC还未损坏前， 能及时有效保护电路呢？ 为此： 发明内容
由上述背景产生， 一种正负双电源供电电路的异常保护装置， 增设过载或 其它异常保护装置，其特征是：在该双电源 OCL功率电路后级输出端负载（RL ) 回路中，增设或兼用串联电流负反馈电阻 R371作为检测源，通过电阻 R46V和
I认本 电容 C46V积分后， 再经由压敏开关器件 VD46支路或二极管 D46支路， 连接 于常态关断、过载导通的过载关机装置，从而实现正负双电源供电的 OCL电路 过流或其它异常保护。
本创新突出优点： 电路简洁可靠， 及时准确保护， 能有效防止再连锁扩大 其他故障。 特别对那些采用正负双电源供电的 OCL伴音功放和场扫描输出级， 如果最初是由集成块外围元件引起的损 i不， 能及时得到过流或其它异常保护。 不仅能有效地防止未该损坏的集成块等再损坏。 还能防止后级负荷 (如:扬声器、 偏转线圈、 显象管等)损坏。 附图说明
说明书附图有 2页共 10幅。 [附图来源于真实实现彩电整机产品具体印制电 路板（PCB )所对应的原理图。 采用局部放大分项专门描述]。 说明书附图， 各 元件所组合后功能名称、 元件位号、 和元件参数或代换范围， 附图分别采用字 体不一样的标记， 可方便区分。 特别是有多个元件组合连接后产生一定功能用 方框虚线加大字体的数字编号或对映缩影方框图， 更方便对照说明书解释。 附 图力求详细本创新相关的必备实质性特征的具体实施例。 其中 φ表示可变更或 可拆端， "*"表^依实际可调试变更参数， "： "表示可去除该元件。 脉冲变压 器原初级导通时， 初次级感应极性同名端一律用黑园点.表示。 普通三极管可优 选代换成场效应管等。 说明书和附图未注解的（特别是元件及其位号）， 按法定 或通行惯例解释。 电路元件、 参数及其位号仅表示该整机产品原理图对映实物 印刷电路板 PCB中附图位号和元件有关属性 BOM参数， 并不都是针对本说明书 而标记的， 仅供本创新优选实施例具体产品参考。 其中， 图 1是本创新技术方案 要点； 图 2是本创新技术及与其有关过载关机装置中必有牵连的电路具体实施 例； 图 3是把过流检测电阻 R371改为从正负默电源中用两个等值分压电阻取样 后， 作为检测源的具体实施例； 图 4是输出信号过大时， 自动电流负反馈增益控 制； 图 5、 图 6输出信号过大时自动关机电路； 图 7或图 8是输入端总平均电流过 载保护电路， 也是防止正负双电源各自负荷同时损坏的过流保护电路实施例。 图 8是本创新彩电回扫变压器 FBT次供电分配和过载关机装置具体实施例。 图 9 和图 10示例是变压器 T (特别是彩电开关变压器 T )或回扫变压器 FBT次级从一 组绕组产生正负双电源的方案和切换呈适合 OTL供电的正单电源 26V供电方案 分配简图， 都是从图 8中摘要的筒图。
电网不相牵连的冷底（电路）板公共端 "地" 用"丄"， （或加其他标记等） 表示， 开关电源变压器 T的绕组公共端 或回扫变压器 FBT的绕组公共端分别 用"丄 GND，，和 "丄 GND2"标记。 不同附图中， 含相同标记， 具有同一对象， 指功 能或性能作用相同。 Vcc可指任一电源高电位端， 有时为了区分不同的 Vcc, 用 5V-1 , 12V-1, ±13V, 26V等不同的电源标记， 可以是任可应需的不同电源电 压数值， 同一附图中除 Vcc外， 相同附图标记者可以相连接。 各图作用具体见 '下文说明。 不同附图中， 含相同标记， 具有同一对象， 指功能或性能作用相同。 Vcc可指任一电源高电位端，可以是不同电源电压数值， 同一附图中除 Vcc夕卜， 相同附图位号标记者可以相连接。 各图作用详见下文说明。 具体实施方式
下面结合附图示例详细说明实现本创新最好方式。 前文已述或结合沿用已 有技术或同理应变更等不再重述。
本说明书中， "正程整流"， 指脉冲变压器次级通过串接二极管整流回路是 与原初线圈通 /断相同的同极性整流滤波回路。 "逆程整流"， 指脉冲变压器次级 通过串接二极管整流回路是与原初线圈通 /断相反的反极性整流滤波回路。
如图 1所示， 本创新正负双电源供电电路的异常保护装置， 增设过载或其 它异常保护装置， 在该双电源 OCL功率电路后级输出端负载（RL ) 回路中， 增设或兼用串联电流负反馈电阻 R371作为检测源， 再通过电阻 R46V和电容 C46V积分后,再经由压敏开关器件 VD46支路或二极管 D46支路， 连接于常态 关断、过载导通的过载关机装置，从而实现正负双电源供电的 OCL电路过流或 其它异常保护。 正常状态或负荷平衡对称时， 电容 C46V两端电压大小相等方 向相反， 积分后电压为零； 如果正负双电源供电的各自负荷不对称失去平^ [紆后 的异常状态出现时， 电容 C46V积分后电压变成正电压或负电压， 再分别经由 常态关断过载导通的压敏开关器件（如： 二极管 D46或稳压器 VD46 ) 支路， 再连接于常态关断、 过载导通的过载关机装置， 就能实现正负双电源供电的 OCL电路过流或其它异常保护。
如果把图 2中 OCL后级输出端负载 RL回路中的电流串联负反馈电阻 R371, 改成从正负双电源中两个等值分压电阻取样后作为检测源。 当正负双电源 VCC 和 -VCC路端电压大小不对称时， 可以作为严重过流时保护。 但异常保护效果不 及图 1或图 2示例方案好，这是因为正负双电流输出电压往往都是大小对称相等， 方向相反， 电源内阻又很小。 除非正负双电源各自负荷中有一路严重短路时， 过流的电源内阻会产生压降， 才能会产生路端电压大小不对称差别检测， 所以 图 3示例方案保护效果不好。 但可以同图 1或图 2示例方案结合用。 图 1中二极管 D462可去除短接。
[图 4示例]: 从放大器后级输出端负载 RL回路中，通过串联电流负反馈电阻 R371 , 经过反馈电阻 R372和 R372A支路连接于（反相）输入端 IN， 在反馈电阻 R372两端再并联常态关断、 过载导通的压敏开关器件 VD462或 VD461支路， 当 输出端负荷电流过大时， 则电流取样电阻 R371电压降增大到一定数值时， 会自 动通过压敏开关器件 VD461/VD462击穿导通， 加大负反馈量， 达到自动降低增 益控制的效果。
[图 5或图 6示例〗： 丈大器后级输出端负载 RL两端， 通过二极管 U611整流 电容 C611积分滤波后作为检控源， 通过常态关断、 过载导通的压敏开关器件 D911 , 连接于过载关机装置中 J7/ ( J7B )或 J8, 达到输出信号幅度过大时， 自 动关机目的。
[图 7示例]: 在正负双电源整流滤波回路中邻近接地端， 分别串接电源取样 电阻 RF2和 RF3， 把取样电阻 RF2和 RF3两端电压降同相叠加后， 其中取样电阻 RF3通过二极管 D461和电阻 R461F支路， 再连接于常态关断、 过载导通的过载 关机装置中控制管 VK4或 VK5基极支路， 就能实现正负双电源供电的 OCL电路 总输入端过流或其它异常自动关机效果。 二极管 D461和电阻 R461F也可以任选 其中之一短接不用。
[图 8示例]: 作为彩电运用最佳实施例。 由行扫描电路（6 )和回扫变压器 FBT ( 20 ), 及其回扫描变压器 FBT次级绕组供电分配电路（20A ), 过载关机装 置（15 ), 自动亮度、 自动对比度和自动行宽电路（21 )和 CRT板地线与防高压 打火 /抗静电装置（44G )等组成， 可增设（或去除）动态聚焦电路（21F )。 过 载关机装置（ 15 )可直接通用于所有的电子电器领域。从图 8中摘要的有关正负 双电源供电分配简图， 参见图 9示例： 回扫变压器 FBT或其他变压器 T次级绕组 经过二极管 U26正程整流电容 C26滤波后， 输出两倍电压（26V ), 该电容 C26正 端通过光线 （J13V )接回扫变压器 FBT次级经过二极管 U21正程整流电容 C21 滤波后输出一倍电压 ( 13V ), 电容 C26负端通过光线（J-13V )接电容（C-13V ) 负端， 该电容（C-13V )正端和电容 (C371)负端相邻连接后接地。 这样， 通过电 容 C26两端电压再向电容 C21、 C371和电容（C-13V )相串接后充电，电容 C21两 端电压负荷较大,具有钳位作用，通过电容 C21、 C371正端和电容（C-13V ) 负端 作为正负双电源供电给 OCL场输出级。 该正负双电源过载保护方案是： 当电容 C2K C 7l供电的负载 (即: OCL上管)过流时，可直接通过过流检测电阻 RF2产生 电压降， 经电阻 R46F电容 C46F积分后， 触发常态关断、 过载导通的复合管 A4 和 VK5且连锁正反馈作用下，立即饱和导通后达到过流关机效果；当电容 (C-13V) 供电的负荷 (即: OCL下管)过流时， 则电容 C21、 两端电压会升高， 通过压 敏开关器件 W91或 W4触发常态关断、 过载导通的复合管 A4和 VK4(或 VK5)且连 锁正反馈作用下， 立即导通后达到过压关机效果。 可见， 本创新实现负压源负 荷过流保护方案是： 是间接保护的， 先强制使相邻连接的其他的行正程整流电 容 C21滤波后电压 13V升高， 达到自身过流转变为其他的过压升高插控关机目 的， 本创新是 OCL场输出电路最佳过载保护方案， 因为该方案不仅能防止正负 双电源各自负荷同时损坏的过流保护电路， 也是正负双电源各自负荷总输入端 平均电流过载保护电路， 对 OCL、 OTLs BTL等所有电路都通用。 而且几乎不 增添成本， 及时保护可靠性和准确性最高。 具体产品实施例详见图 8示例。
该变压器 T/FBT次级一组独立线圏（S89 )分别通过光线 J13V、 J-13V, J928 不同的连接关系，可切换输出五种以上的不同电压。从图 8中摘要的有关正负双 电源供电分配简图，参见图 9示例： 可输出 （逆程整流） 205V, (正程整流）正负 13V这三组电压； 回扫变压器 FBT逆程整流电压是正程整流电压的 7.5倍左右。 如果去除光线 J13V、 J-13V,把电容 C26负端直接通过光线 J928连接变压器 T/FBT 的地 GND2可输出 218V， +26V这两组电压。 从图 8中摘要的有关适合 OTL供电 的正单电源 26V供电分配筒图，参见图 10示例：
• 本创新对所有的正负双电源或正单电源供电的开关状态的推挽电路如: D类 开关式扫描电路 STV9388、 数字功放 TDA7490、 MP7710/7720等也适用。 图 1 或图 2,对正负双电源各自负荷同时对称异常不能检测有效保护。如果需要防止 正负双电源各自负荷同时损坏。 可采用图 7或图 8示例为佳。 说明书附图参数仅 作举例参考， 运用时任可调变参数。 附图中供任可选择的方案多， 无需的元件 可去除或短接。 本创新可直接扩展运用电视外其它电子电工技术领域。
本说明书中附图所有的位号和参数可以更改。 如： CPU供电端位号 5V-1 , 根据 CPU实际需要，可以是 5V, 3.3V, 1.8V等，供电端位号 13V可以是 12V左右。 未特别说明的， 有的位号元件， 如： 电阻等等可改为二极管等等或其他元件。
本创新方案可以单独或其相结合运用。特别对电视和音响技术产品更适合。 工业实用性
在本发明的实施例中， 在该双电源供电的后级输出端负载（RL ) 回路中， 增设或兼用串联电流负反馈电阻 R371作为检测源， 再通过电阻 R46V和电容 C46V积分后， 再经由压敏开关器件 VD46或二极管 D46支路， 连换接于常态 关断、过载导通的过载关机装置，从而实现正负双电源供电的 OCL电路过流或 其它异常及时有效保护。

Claims

权 利 要 求
1.一种正负双电源供电电路的异常保护装置， 增设过载或其它异常保护 装置， 其特征在于： 在双电源 OCL功率电路后级输出端负载（RL ) 回路中， 增设或兼用串联电流负反馈电阻 R371 作为检测源， 通过电阻 R46V和电容 C46V积分后， 经由压敏开关器件 VD46支路或二极管 D46支路， 连接于常态 关断、 过载导通的过载关机装置， 从而实现正负双电源供电的 OCL电路过流 或其它异常保护。
2.一种正负双电源供电电路的异常保护装置， 增设过载或其它异常保护 装置， 其特征在于： 回扫变压器 FBT或其他变压器 T的次级绕组经过二极管 U26正程整流电容 C26滤波后， 输出两倍电压 (26V)， 该电容 C26正端通过光 线（ J13V )接回扫变压器 FBT次级， 经过二极管 U21正程整流电容 C21滤波 后输出一倍电压（13V ), 电容 C26负端通过光线（J-13V )接电容（C-13V ) 负端， 该电容（C-13V )正端和电容 (C371)负端相邻连接后接地。
3.根据权利要求 2 所述的正负双电源供电电路的异常保护装置， 其特征 是： 该变压器 T/FBT次级一组独立线圈 （S89 )分别通过光线 J13V、 J-13V, J928不同的连接关系， 可切换输出五种以上的不同电压； 若去除光线 J13V、 J-13V, 把电容 C26负端直接通过光线 J928连接变压器 T/FBT的地 GND2可 输出 218V, +26V这两组电压， 适合 OTL供电的正单电源 26V, 若增添光线 J13V、 J-13V, 把电容 C26正端通过光线（J13V )接回扫变压器 FBT次级经过 二极管 U21正程整流电容 C21 滤波后正电压 13V, 电容 C26 负端通过光线
( J-13V )接电容（C-13V ) 负端， 该电容（C-13V )正端和电容 (371)负端相邻 连接后接地；这样，通过电容 C26两端电压再向电容 C21 371和电容（C-13V ) 相串接后充电， 电容 C21 两端电压负荷较大,具有钳位作用， 通过电容 C21、 C371正端和电容（C-13V ) 负端作为正负双电源供电给 OCL场输出级。
4.根据权利要求 2所述的正负双电源供电电路的异常保护装置， 其特征 是： 在正负双电源整流滤波回路中邻近接地端， 分别串接电源取样电阻 RF2 和 RF3, 把取样电阻 RF2和 RP3两端电压降同相叠加后， 其中取样电阻 RF3 通过二极管 D461和电阻 R461F支路， 再连接于常态关断、 过载导通的过载关 机装置中控制管 VK4或 VK5基极支路， 就能实现正负双电源供电的 OCL电 路总输入端过流或其它异常自动关机效果，二极管 D461和电阻 R461F也可以 任选其中之一短接不用。
5. 根据权利要求 1所述的正负双电源供电电路的异常保护装置， 其特征 是： 从放大器后级输出端负载 RL回路中， 通过串联电流负反馈电阻 R371,经 过反馈电阻 R372和 R372A支路连接于反相输入端 IN,在反馈电阻 R372两端 再并联常态关断、 过载导通的压敏开关器件 VD462或 VD461支路， 当输出端 负荷电流过大时， 则电流取样电阻 R371电压降增大到一定数值时， 会自动通 过压敏开关器件 VD461/VD462击穿导通， 加大负反馈量， 达到自动降低增益 控制的效果。
6. 根据权利要求 1所述的正负双电源供电电路的异常保护装置， 其特征： 是从放大器后级输出端负载 RL两端，通过二极管 U611整流电容 C611积分滤 波后作为检控源， 通过常态关断、 过载导通的压敏开关器件 D911 , 连接于过 载关机装置中 J7/ ( J7B )或 J8, 达到输出信号幅度过大时， 自动关机目的。
PCT/CN2008/000548 2008-01-15 2008-03-20 Dispositif de protection pour un circuit d'alimentation avec une double puissance positive et négative WO2009089665A1 (fr)

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