WO2017219737A1 - 一种机顶盒断电放电电路及放电方法 - Google Patents

一种机顶盒断电放电电路及放电方法 Download PDF

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Publication number
WO2017219737A1
WO2017219737A1 PCT/CN2017/080425 CN2017080425W WO2017219737A1 WO 2017219737 A1 WO2017219737 A1 WO 2017219737A1 CN 2017080425 W CN2017080425 W CN 2017080425W WO 2017219737 A1 WO2017219737 A1 WO 2017219737A1
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WIPO (PCT)
Prior art keywords
power
top box
unit
discharge
transistor
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PCT/CN2017/080425
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English (en)
French (fr)
Inventor
赵玮
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深圳市九洲电器有限公司
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Publication of WO2017219737A1 publication Critical patent/WO2017219737A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/443—OS processes, e.g. booting an STB, implementing a Java virtual machine in an STB or power management in an STB
    • H04N21/4436—Power management, e.g. shutting down unused components of the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/443—OS processes, e.g. booting an STB, implementing a Java virtual machine in an STB or power management in an STB

Definitions

  • the present invention relates to a digital television device, and more particularly to a set top box power-off discharge circuit and a discharge method.
  • Set-top boxes are common digital television devices that are widely used in various homes.
  • a set-top box uses a capacitive load such as a capacitor.
  • a capacitive load such as a capacitor.
  • the capacitive load When the capacitive load is turned off, the charge does not disappear immediately, and the voltage on the circuit does not disappear quickly. Instead, it slowly drops and cannot discharge quickly.
  • the set-top box is down again, if the discharge is not completed
  • the residual voltage of the circuit is still large. 3 ⁇ 4 will affect the voltage power-on sequence of the circuit, causing the set-top box to start abnormally or fail, making the set-top box unable to work normally, which seriously affects the performance of the set-top box.
  • the present invention provides a set top box power-off discharge circuit, comprising an energy storage unit, a power-off detection unit, a negative pressure unit and a discharge unit; the energy storage unit is connected with a power supply bus and a power-off detection unit, and works in a set-top box. After power-on, the power is obtained from the power supply bus and stored, and the set-top box is powered off, and the power-off detection unit is supplied with power for the power-off detection unit, the power-off detection unit and the energy storage unit, the power supply bus and the negative pressure unit.
  • the negative pressure unit Connecting, detecting the voltage of the power supply bus to determine whether the set top box is in a power off state, and controlling the negative pressure unit according to the determination result, the negative pressure unit is connected with the power supply bus, the power failure detecting unit and the discharge unit, and the set top box is
  • the power-off state is controlled by the power-off detecting unit, and a negative voltage is formed at the discharge unit to increase a voltage difference between the discharge unit and the capacitive load or the power supply bus.
  • the power-off detecting unit detects a power supply bus voltage, and if the voltage is higher than a set threshold, determining that the set-top box is in a normal power supply state, and outputting a high-level control signal to the negative pressure unit If the detected voltage is lower than the set threshold, it is determined that the set-top box is in the power-off state, and the output is low. Control signals to the negative pressure unit.
  • the negative voltage unit receives a high level control signal ⁇ , and receives power from the power supply bus and stores; receives a low level control signal, and uses the stored power to form at the discharge unit. Negative voltage.
  • the negative voltage unit includes a first resistor, a second resistor, a storage capacitor, a first transistor, a second transistor, and a third transistor; a detecting unit, the other end is connected to the base of the first transistor and the base of the second transistor, the first transistor is an NP N transistor, the collector is connected to the power supply bus, and the emitter is connected to the emitter of the second transistor and the end of the storage capacitor
  • the second transistor is a PNP transistor, the collector is grounded, the third transistor is an NPN transistor, the collector is connected to the discharge unit and the other end of the storage capacitor, the emitter is grounded, the base is connected to one end of the second resistor, and the other end of the second resistor is connected. Electrical detection unit.
  • the discharge unit is turned off in a normal power supply state of the set top box, and is turned on when the set top box is in a power off state.
  • the discharge unit includes a fourth transistor and a third resistor; the fourth transistor is a PNP transistor, and the collector is connected to the collector of the third transistor and the other end of the storage capacitor, and is emitted.
  • the pole is connected to the power supply bus, the base is connected to one end of the third resistor, and the other end of the third resistor is controlled by the power-off detecting unit.
  • the present invention provides a set top box power-off discharge method, comprising the following steps:
  • S10 monitoring whether the set top box is in a power off state
  • S20 If the set top box is in the power-off state, a negative voltage is formed at the discharge unit to increase the voltage difference between the discharge unit and the capacitive load or the power supply bus.
  • the step S10 is specifically: monitoring whether the set top box is powered off by detecting the voltage of the set top box power supply bus.
  • the step S10 is specifically: detecting a power supply bus VCC voltage, if the voltage is higher than a set threshold, determining that the set top box is in a normal power supply state, outputting a high level control signal; When the voltage is lower than the set threshold, it is determined that the set top box is in a power-off state, and a low-level control signal is output.
  • the set top box power-off discharge circuit and method of the present invention monitors the working state of the set-top box to determine whether the set-top box is in a power-off state, and the set-top box is in a power-off state, forming a negative voltage in the discharge unit, increasing the discharge unit and the capacitive load or power supply.
  • the voltage difference between the buses so that the charge is transferred more quickly, speed up the discharge, achieve rapid discharge, avoid the abnormal or failure of the set-top box, so that the set-top box can work normally and ensure the performance of the set-top box.
  • FIG. 1 is a structural diagram of a set top box power-off discharge circuit in an embodiment
  • FIG. 2 is a detailed structural diagram of a set top box power-off discharge circuit in an embodiment
  • FIG. 3 is a flow chart of a method for powering down a set top box in an embodiment.
  • the present invention provides a set top box power-off discharge circuit, which generates a negative power supply and provides after shutdown. A negative voltage field is superimposed on the original discharge cell, so that a larger voltage difference and an electric field are formed between the discharge cell and the capacitive load (or the power supply bus), so that the charge is transferred more quickly, thereby achieving rapid discharge.
  • FIG. 1 is a structural diagram of a power-off discharge circuit of a set-top box in an embodiment
  • FIG. 2 is a specific structural diagram of a power-off discharge circuit of a set-top box in an embodiment.
  • the set-top box is The power-off discharge circuit includes: an energy storage unit 100, a power-off detection unit 200, a negative pressure unit 300, and a discharge unit 400.
  • the energy storage unit 100 is connected to the power supply bus VCC and the power failure detecting unit 200, and is powered on by the set top box.
  • the power bus VCC acquires power and stores it, and supplies power to the power-off detecting unit 200 for the power-off detecting unit 200 to operate when the set-top box is powered off.
  • the power-off detecting unit 200 is connected to the energy storage unit 100, the power supply bus VCC, and the negative voltage unit 300, detects the voltage of the power supply bus VCC to determine whether the set-top box is in a power-off state, and controls the negative pressure unit 300 according to the determination result.
  • the negative voltage unit 300 is connected to the power supply bus VCC, the power-off detecting unit 200, and the discharge unit 400, and receives the control of the power-off detecting unit 200 when the set-top box is in the power-off state, forms a negative voltage at the discharging unit 400, and increases the discharging unit 400.
  • the voltage difference between the capacitive load or the power supply bus V CC accelerates the discharge speed of the discharge cell 400.
  • the power-off detecting unit 200 detects the power supply bus VCC voltage, and if the voltage is higher than the set threshold, it determines that the set-top box is in a normal power supply state, and outputs a high-level control signal to the negative voltage unit 300; When the threshold is set, it is determined that the set top box is in the power-off state, and the low-level control signal is output to the negative pressure unit 300.
  • the negative voltage unit 300 receives the high level control signal ⁇ , and obtains the electric energy from the power supply bus VCC and stores it; receives the low level control signal and uses the stored electric energy to form a negative voltage at the discharge unit 400.
  • the negative voltage unit 300 includes a first resistor R1, a second resistor R2, a storage capacitor C1, a first transistor Q1, a second transistor Q2, and a third transistor Q3.
  • the first resistor R1 is connected to the power-off detecting unit 20 0, and the other end is connected to the base B of the first transistor Q1 and the base B of the second transistor Q2.
  • the first transistor Q1 is an NPN transistor, the collector C is connected to the power supply bus VCC, and the emitter E is connected to the emitter E of the second transistor Q2 and one end of the storage capacitor C1.
  • the second transistor Q2 is a PNP transistor, and the collector C is grounded.
  • the third transistor Q3 is an NPN transistor, the collector C is connected to the discharge cell 400 and the other end of the storage capacitor C1, the emitter E is grounded, and the base B is connected to the second resistor R2. The other end of the second resistor R2 is connected to the power-off detecting unit 200.
  • the discharge unit 400 is turned off when the set top box is in a normal power supply state, and is turned on when the set top box is in a power off state.
  • the discharge cell 400 includes a fourth transistor Q4 and a third resistor R3.
  • the fourth transistor Q4 is a PNP transistor, the collector C is connected to the collector C of the third transistor Q3 and the other end of the storage capacitor C1, the emitter E is connected to the power supply bus VCC, and the base B is connected to the third resistor R3-end, the third The other end of the resistor R3 is controlled by the power-off detecting unit 200.
  • the set top box power-off discharge circuit in the set-top box is in a normal power supply state, the power-off detecting unit 200 outputs a high-level control signal ⁇ , the second transistor Q2 is turned off, the first transistor Q1 and the third transistor Q3 are saturated, and the power is supplied.
  • the bus VCC charges the storage capacitor C1.
  • the power failure detecting unit 2 00 output low level control signal ⁇ , the first transistor Q1 and the third transistor Q3 are turned off, the second transistor Q2 is turned on, the positive end of the storage capacitor C1 is grounded, and the other end of the storage capacitor C1 with negative charge is opposite to the ground.
  • the negative voltage thereby forming a negative voltage at the discharge cell 400, accelerates the discharge of the discharge cell 400 to the capacitive load or the power supply bus VCC, and quickly completes the discharge.
  • the set top box power-off discharge circuit monitors the working state of the set-top box to determine whether the set-top box is in a power-off state, and the set-top box is in a power-off state, forming a negative voltage in the discharge unit, increasing the discharge unit and the capacitive load or the power supply bus.
  • the voltage difference between them makes the charge transfer more quickly, speeds up the discharge, realizes rapid discharge, avoids the abnormal start or failure of the set-top box, and enables the set-top box to work normally and ensure the performance of the set-top box.
  • the present invention further provides a method for powering off the set top box. As shown in FIG. 3, the method includes the following steps:
  • S10 Monitor whether the set top box is in a power off state.
  • S20 If the set top box is in the power-off state, a negative voltage is formed at the discharge unit to increase the voltage difference between the discharge unit and the capacitive load or the power supply bus.
  • a negative voltage is formed at the discharge unit, and the negative voltage can increase the voltage difference between the discharge unit and the capacitive load or the power supply bus, accelerate the discharge, and thereby quickly complete the discharge.
  • the set-top box power-off discharge method monitoring the working state of the set-top box to determine whether the set-top box is in a power-off state, forming a negative voltage in the discharge unit when the set-top box is powered off, increasing the discharge unit and the capacitive load or the power supply bus The voltage difference between them makes the charge transfer more quickly, speeds up the discharge, realizes rapid discharge, avoids the abnormal start or failure of the set-top box, and enables the set-top box to work normally and ensure the performance of the set-top box.
  • the set top box power-off discharge circuit and method of the present invention monitors the working state of the set-top box to determine whether the set-top box is in a power-off state, and the set-top box is in a power-off state, forming a negative voltage in the discharge unit, increasing the discharge unit and the capacitive load or power supply.
  • the voltage difference between the buses which allows the charge to transfer more quickly and speed up the discharge , to achieve rapid discharge, to avoid abnormal or failure of the set-top box to start, so that the set-top box can work normally, to ensure the performance of the set-top box.

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  • Engineering & Computer Science (AREA)
  • Software Systems (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • General Engineering & Computer Science (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

本方案涉及一种机顶盒断电放电电路及方法，监测机顶盒的工作状态判定机顶盒是否为断电状态，在机顶盒为断电状态时在放电单元形成负电压，增大放电单元与容性负载或供电总线之间的电压差，从而使电荷更加快速的转移，加快放电速度，实现快速放电，避免机顶盒启动异常或者失败，使得机顶盒能够正常工作，保证机顶盒的性能。

Description

一种机顶盒断电放电电路及放电方法 技术领域
[0001] 本发明涉及数字电视设备， 尤其涉及一种机顶盒断电放电电路及放电方法。
背景技术
[0002] 机顶盒是常见的数字电视设备， 广泛应用在各个家庭中。
[0003] 机顶盒作为一种高端智能的电子设备， 电路中会使用到电容等容性负载， 容性 负载在关机断电吋， 电荷不会马上消失， 导致电路上的电压并不会迅速消失， 而是缓慢下降， 不能快速完成放电。 当机顶盒再次幵机吋， 如果放电没有完成
， 电路的残留电压仍然较大， ¾ 么将会影响电路的电压上电顺序， 导致机顶盒 启动异常或者失败， 使得机顶盒不能正常工作， 严重影响机顶盒的性能。
技术问题
[0004] 有鉴于此， 有必要针对上述机顶盒关机断电吋不能快速完成放电， 导致重启异 常或失败的问题， 提供一种机顶盒断电放电电路及放电方法。
问题的解决方案
技术解决方案
[0005] 本发明提供的一种机顶盒断电放电电路， 包括储能单元、 断电检测单元、 负压 单元以及放电单元； 所述储能单元与供电总线和断电检测单元连接， 在机顶盒 工作通电吋由供电总线上获取电能并存储， 并在机顶盒断电吋为所述断电检测 单元提供电能供断电检测单元工作， 所述断电检测单元与储能单元、 供电总线 及负压单元连接， 检测供电总线的电压来判断机顶盒是否为断电状态， 并根据 判断结果对所述负压单元进行控制， 所述负压单元与供电总线、 断电检测单元 及放电单元连接， 在机顶盒为断电状态吋接受所述断电检测单元的控制， 在放 电单元处形成负电压， 增大放电单元与容性负载或供电总线之间的电压差。
[0006] 在其中的一个实施方式中， 所述断电检测单元检测供电总线电压， 若电压高于 设定阈值， 则判断机顶盒处于正常供电状态， 输出高电平控制信号至所述负压 单元； 若检测到电压低于设定阈值， 则判定机顶盒处于断电状态， 输出低电平 控制信号至所述负压单元。
[0007] 在其中的一个实施方式中， 所述负压单元接收到高电平控制信号吋， 由供电总 线获取电能并存储； 接收到低电平控制信号吋利用存储的电能在放电单元处形 成负电压。
[0008] 在其中的一个实施方式中， 所述负压单元包括第一电阻、 第二电阻、 储能电容 、 第一晶体管、 第二晶体管及第三晶体管； 所述第一电阻一端连接断电检测单 元， 另一端连接第一晶体管的基极和第二晶体管的基极， 所述第一晶体管为 NP N晶体管， 集电极连接供电总线， 发射极连接第二晶体管的发射极和储能电容一 端， 第二晶体管为 PNP晶体管， 集电极接地， 第三晶体管为 NPN晶体管， 集电极 连接放电单元和储能电容另一端， 发射极接地， 基极连接第二电阻一端， 第二 电阻另一端连接断电检测单元。
[0009] 在其中的一个实施方式中， 所述放电单元在机顶盒正常供电状态吋截止， 在机 顶盒处于断电状态吋导通。
[0010] 在其中的一个实施方式中， 所述放电单元包括第四晶体管及第三电阻； 所述第 四晶体管为 PNP晶体管， 集电极连接第三晶体管的集电极和储能电容另一端， 发 射极连接供电总线， 基极连接所述第三电阻一端， 第三电阻另一端接受所述断 电检测单元控制。
[0011] 本发明提供的一种机顶盒断电放电方法， 包括如下步骤：
[0012] S10: 监测机顶盒是否为断电状态；
[0013] S20: 若机顶盒处于断电状态， 则在放电单元处形成负电压， 增大放电单元与 容性负载或供电总线之间的电压差。
[0014] 在其中的一个实施方式中， 所述步骤 S10具体为： 通过检测机顶盒供电总线的 电压来监测机顶盒是否为断电状态。
[0015] 在其中的一个实施方式中， 所述步骤 S10具体为： 检测供电总线 VCC电压， 若 电压高于设定阈值， 则判断机顶盒处于正常供电状态， 输出高电平控制信号； 若检测到电压低于设定阈值， 则判定机顶盒处于断电状态， 输出低电平控制信 号。
发明的有益效果 有益效果
[0016] 本发明机顶盒断电放电电路及方法， 监测机顶盒的工作状态判定机顶盒是否为 断电状态， 在机顶盒为断电状态吋在放电单元形成负电压， 增大放电单元与容 性负载或供电总线之间的电压差， 从而使电荷更加快速的转移， 加快放电速度 ， 实现快速放电， 避免机顶盒启动异常或者失败， 使得机顶盒能够正常工作， 保证机顶盒的性能。
对附图的简要说明
附图说明
[0017] 图 1是一个实施例中的机顶盒断电放电电路的结构图；
[0018] 图 2是一个实施例中的机顶盒断电放电电路的具体结构图；
[0019] 图 3是一个实施例中的机顶盒断电放电方法的流程图。
本发明的实施方式
[0020] 为了使本发明的目的、 技术方案及优点更加清楚明白， 以下结合附图及实施例 ， 对本发明进行进一步详细说明。 应当理解， 此处所描述的具体实施例仅用以 解释本发明， 并不用于限定本发明。
[0021] 机顶盒在关机断电后， 电路中的容性负载与机顶盒电源总线或者放电单元之间 会存在一个壁垒， 可以看作为一个壁垒电阻， 壁垒电阻会阻碍电子的转移， 影 响残留电压的泄放速度使得放电速度变慢。
[0022] 在更大的压差电场作用下， 电子的转移速度会大大提高， 能够提高放电速度， 本发明根据这个原理， 提供一种机顶盒断电放电电路， 产生一个负电源并在关 机后提供一个负电压场叠加于原放电单元， 这样在放电单元与容性负载 （或供 电总线） 之间形成一个更大的电压差和电场， 使电荷更加快速的转移， 从而实 现快速放电。
[0023] 具体的， 图 1是一个实施例中的机顶盒断电放电电路的结构图， 图 2是一个实施 例中的机顶盒断电放电电路的具体结构图， 结合图 1和图 2， 该机顶盒断电放电 电路包括： 储能单元 100、 断电检测单元 200、 负压单元 300以及放电单元 400。 储能单元 100与供电总线 VCC和断电检测单元 200连接， 在机顶盒工作通电吋由 供电总线 VCC上获取电能并存储， 并在机顶盒断电吋为断电检测单元 200提供电 能供断电检测单元 200工作。 断电检测单元 200与储能单元 100、 供电总线 VCC及 负压单元 300连接， 检测供电总线 VCC的电压来判断机顶盒是否为断电状态， 并 根据判断结果对负压单元 300进行控制。 负压单元 300与供电总线 VCC、 断电检 测单元 200及放电单元 400连接， 在机顶盒为断电状态吋接受断电检测单元 200的 控制， 在放电单元 400处形成负电压， 增大放电单元 400与容性负载或供电总线 V CC之间的电压差， 加快放电单元 400的放电速度。
[0024] 进一步的， 断电检测单元 200检测供电总线 VCC电压， 若电压高于设定阈值， 则判断机顶盒处于正常供电状态， 输出高电平控制信号至负压单元 300; 若检测 到电压低于设定阈值， 则判定机顶盒处于断电状态， 输出低电平控制信号至负 压单元 300。
[0025] 负压单元 300接收到高电平控制信号吋， 由供电总线 VCC获取电能并存储； 接 收到低电平控制信号吋利用存储的电能在放电单元 400处形成负电压。
[0026] 进一步的， 负压单元 300包括第一电阻 Rl、 第二电阻 R2、 储能电容 Cl、 第一晶 体管 Ql、 第二晶体管 Q2及第三晶体管 Q3。 第一电阻 R1—端连接断电检测单元 20 0， 另一端连接第一晶体管 Q1的基极 B和第二晶体管 Q2的基极 B。 第一晶体管 Q1 为 NPN晶体管， 集电极 C连接供电总线 VCC， 发射极 E连接第二晶体管 Q2的发射 极 E和储能电容 C1一端。 第二晶体管 Q2为 PNP晶体管， 集电极 C接地。 第三晶体 管 Q3为 NPN晶体管， 集电极 C连接放电单元 400和储能电容 C1另一端， 发射极 E 接地， 基极 B连接第二电阻 R2—端。 第二电阻 R2另一端连接断电检测单元 200。
[0027] 放电单元 400在机顶盒正常供电状态吋截止， 在机顶盒处于断电状态吋导通。
放电单元 400包括第四晶体管 Q4及第三电阻 R3。 第四晶体管 Q4为 PNP晶体管， 集 电极 C连接第三晶体管 Q3的集电极 C和储能电容 C 1另一端， 发射极 E连接供电总 线 VCC， 基极 B连接第三电阻 R3—端， 第三电阻 R3另一端接受断电检测单元 200 控制。
[0028] 该机顶盒断电放电电路， 在机顶盒处于正常供电状态， 断电检测单元 200输出 高电平控制信号吋， 第二晶体管 Q2截止， 第一晶体管 Q1和第三晶体管 Q3饱和导 通， 供电总线 VCC为储能电容 C1充电。 当机顶盒处于断电状态， 断电检测单元 2 00输出低电平控制信号吋， 第一晶体管 Q1和第三晶体管 Q3截止， 第二晶体管 Q2 导通， 储能电容 C1带正电荷的一端接地， 储能电容 C1带负电的另一端相对接地 呈现负电压， 从而在放电单元 400处形成负电压， 加速放电单元 400对容性负载 或者供电总线 VCC的放电， 快速完成放电。
[0029] 该种机顶盒断电放电电路， 监测机顶盒的工作状态判定机顶盒是否为断电状态 ， 在机顶盒为断电状态吋在放电单元形成负电压， 增大放电单元与容性负载或 供电总线之间的电压差， 从而使电荷更加快速的转移， 加快放电速度， 实现快 速放电， 避免机顶盒启动异常或者失败， 使得机顶盒能够正常工作， 保证机顶 盒的性能。
[0030] 同吋， 本发明还提供一种机顶盒断电放电方法， 如图 3所示， 该方法包括如下 步骤：
[0031] S10: 监测机顶盒是否为断电状态。
[0032] 该步骤中， 通过检测机顶盒供电总线的电压来监测机顶盒是否为断电状态。 更 进一步的， 检测供电总线 VCC电压， 若电压高于设定阈值， 则判断机顶盒处于 正常供电状态， 输出高电平控制信号； 若检测到电压低于设定阈值， 则判定机 顶盒处于断电状态， 输出低电平控制信号。
[0033] S20: 若机顶盒处于断电状态， 则在放电单元处形成负电压， 增大放电单元与 容性负载或供电总线之间的电压差。
[0034] 在机顶盒处于断电状态吋， 在放电单元处形成负电压， 负电压能够增大放电单 元与容性负载或供电总线之间的电压差， 加速放电， 从而快速完成放电。
[0035] 该种机顶盒断电放电方法， 监测机顶盒的工作状态判定机顶盒是否为断电状态 ， 在机顶盒为断电状态吋在放电单元形成负电压， 增大放电单元与容性负载或 供电总线之间的电压差， 从而使电荷更加快速的转移， 加快放电速度， 实现快 速放电， 避免机顶盒启动异常或者失败， 使得机顶盒能够正常工作， 保证机顶 盒的性能。
[0036] 本发明机顶盒断电放电电路及方法， 监测机顶盒的工作状态判定机顶盒是否为 断电状态， 在机顶盒为断电状态吋在放电单元形成负电压， 增大放电单元与容 性负载或供电总线之间的电压差， 从而使电荷更加快速的转移， 加快放电速度 ， 实现快速放电， 避免机顶盒启动异常或者失败， 使得机顶盒能够正常工作， 保证机顶盒的性能。
以上仅为本发明的较佳实施例而已， 并不用以限制本发明， 凡在本发明的精神 和原则之内所作的任何修改、 等同替换和改进等， 均应包含在本发明的保护范 围之内。

Claims

权利要求书
[权利要求 1] 一种机顶盒断电放电电路， 其特征在于， 包括储能单元、 断电检测单 元、 负压单元以及放电单元； 所述储能单元与供电总线和断电检测单 元连接， 在机顶盒工作通电吋由供电总线上获取电能并存储， 并在机 顶盒断电吋为所述断电检测单元提供电能供断电检测单元工作， 所述 断电检测单元与储能单元、 供电总线及负压单元连接， 检测供电总线 的电压来判断机顶盒是否为断电状态， 并根据判断结果对所述负压单 元进行控制， 所述负压单元与供电总线、 断电检测单元及放电单元连 接， 在机顶盒为断电状态吋接受所述断电检测单元的控制， 在放电单 元处形成负电压， 增大放电单元与容性负载或供电总线之间的电压差 根据权利要求 1所述的机顶盒断电放电电路， 其特征在于， 所述断电 检测单元检测供电总线电压， 若电压高于设定阈值， 则判断机顶盒处 于正常供电状态， 输出高电平控制信号至所述负压单元； 若检测到电 压低于设定阈值， 则判定机顶盒处于断电状态， 输出低电平控制信号 至所述负压单元。
根据权利要求 2所述的机顶盒断电放电电路， 其特征在于， 所述负压 单元接收到高电平控制信号吋， 由供电总线获取电能并存储； 接收到 低电平控制信号吋利用存储的电能在放电单元处形成负电压。
根据权利要求 3所述的机顶盒断电放电电路， 其特征在于， 所述负压 单元包括第一电阻、 第二电阻、 储能电容、 第一晶体管、 第二晶体管 及第三晶体管； 所述第一电阻一端连接断电检测单元， 另一端连接第 一晶体管的基极和第二晶体管的基极， 所述第一晶体管为 NPN晶体管 ， 集电极连接供电总线， 发射极连接第二晶体管的发射极和储能电容 一端， 第二晶体管为 PNP晶体管， 集电极接地， 第三晶体管为 NPN晶 体管， 集电极连接放电单元和储能电容另一端， 发射极接地， 基极连 接第二电阻一端， 第二电阻另一端连接断电检测单元。
根据权利要求 4所述的机顶盒断电放电电路， 其特征在于， 所述放电 单元在机顶盒正常供电状态吋截止， 在机顶盒处于断电状态吋导通。 根据权利要求 5所述的机顶盒断电放电电路， 其特征在于， 所述放电 单元包括第四晶体管及第三电阻； 所述第四晶体管为 PNP晶体管， 集 电极连接第三晶体管的集电极和储能电容另一端， 发射极连接供电总 线， 基极连接所述第三电阻一端， 第三电阻另一端接受所述断电检测 单元控制。
一种机顶盒断电放电方法， 其特征在于， 包括如下步骤：
S10: 监测机顶盒是否为断电状态；
S20: 若机顶盒处于断电状态， 则在放电单元处形成负电压， 增大放 电单元与容性负载或供电总线之间的电压差。
根据权利要求 7所述的机顶盒断电放电方法， 其特征在于， 所述步骤 S 10具体为： 通过检测机顶盒供电总线的电压来监测机顶盒是否为断电 状态。
根据权利要求 8所述的机顶盒断电放电方法， 其特征在于， 所述步骤 S 10具体为： 检测供电总线 VCC电压， 若电压高于设定阈值， 则判断机 顶盒处于正常供电状态， 输出高电平控制信号； 若检测到电压低于设 定阈值， 则判定机顶盒处于断电状态， 输出低电平控制信号。
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