WO2019095536A1 - 一种过压保护电路及投影机 - Google Patents

一种过压保护电路及投影机 Download PDF

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Publication number
WO2019095536A1
WO2019095536A1 PCT/CN2018/071444 CN2018071444W WO2019095536A1 WO 2019095536 A1 WO2019095536 A1 WO 2019095536A1 CN 2018071444 W CN2018071444 W CN 2018071444W WO 2019095536 A1 WO2019095536 A1 WO 2019095536A1
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circuit
resistor
overvoltage protection
capacitor
action
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PCT/CN2018/071444
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English (en)
French (fr)
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黄国生
李屹
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深圳光峰科技股份有限公司
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Publication of WO2019095536A1 publication Critical patent/WO2019095536A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]

Definitions

  • the present invention relates to the field of projection devices, and in particular, to an overvoltage protection circuit and a projector.
  • an overvoltage protection circuit In the power module, in order to make the power module work more reliably, it is generally necessary to have an overvoltage protection circuit. Some control ICs do not have overvoltage protection, and they need to be implemented with peripheral circuits. Some control ICs have integrated overvoltage protection, but they have the possibility of self-control disorder. When overvoltage occurs, they cannot be effectively protected. Therefore, the existing overvoltage protection circuit has the disadvantage that the overvoltage protection performance is not stable enough or the automatic output cannot be automatically restored.
  • the main object of the present invention is to provide an overvoltage protection circuit and a projector.
  • the circuit composed of discrete components realizes an overvoltage protection function and an automatic recovery function after the operation, and the circuit structure is simple and the cost performance is high.
  • an overvoltage protection circuit includes: a first detection circuit, a switch circuit, an action and a delay recovery circuit, wherein the first detection circuit is configured to detect an output voltage of the power module, When the output voltage is higher than the preset overvoltage value, a control signal is output to the switch circuit; when the switch circuit receives the control signal, the switch is turned on; when the switch circuit is turned on, the action and the delay
  • the time recovery circuit triggers the overvoltage protection action, and after a preset delay time period, the first detection circuit restarts detecting the output voltage of the power module.
  • the overvoltage protection circuit further includes a second detecting circuit, configured to detect a temperature of the power module, when the temperature is higher than a preset first temperature threshold, the alarm module sends an alarm signal, and the heat dissipation module according to the The alarm signal increases heat dissipation efficiency; when the temperature is higher than a preset second temperature threshold, the switch circuit is turned on, and the action and delay recovery circuit triggers an overvoltage protection action.
  • a second detecting circuit configured to detect a temperature of the power module, when the temperature is higher than a preset first temperature threshold, the alarm module sends an alarm signal, and the heat dissipation module according to the The alarm signal increases heat dissipation efficiency; when the temperature is higher than a preset second temperature threshold, the switch circuit is turned on, and the action and delay recovery circuit triggers an overvoltage protection action.
  • the overvoltage protection action is specifically: when the switch circuit is turned on, outputting a low voltage to an enable pin of the power module, so that the power module stops working.
  • the second temperature threshold is greater than the first temperature threshold.
  • the first detecting circuit comprises: a resistor R5, a resistor R6, a capacitor C3, and a Zener diode U1, wherein the anode of the Zener diode U1 is grounded, the reference pole of the Zener diode U1 and one end of the resistor R5, and the resistor One end of R6 and one end of capacitor C3 are connected together, the other end of resistor R5 is grounded, the other end of resistor R6 is connected to output voltage terminal V-OUT, and the other end of capacitor C3 is grounded.
  • the switch circuit includes: a resistor R1, a resistor R2, a capacitor C1, a transistor Q2, and a diode D1, wherein one end of the resistor R2 is connected to a cathode of the Zener diode U1, and the other end of the resistor R2 is One end of the resistor R1, one end of the capacitor C1 and the base of the transistor Q2 are connected together, and the other end of the resistor R1 is connected to the other end of the capacitor C1, the emitter of the transistor Q2, and the power supply terminal VCC, and the collector of the transistor Q2 is connected.
  • the action and delay recovery circuit includes: a resistor R3, a resistor R4, a capacitor C2, and a field effect transistor Q1, wherein one end of the resistor R3 is opposite to the anode of the diode D1, one end of the resistor R4, and a field effect transistor.
  • the gates of Q1 are connected together, the other end of the resistor R3 is connected to one end of the capacitor C2, the other end of the capacitor C2 is grounded, the other end of the resistor R4 is grounded together with the source of the field effect transistor Q1, and the drain of the field effect transistor Q1 is connected.
  • Power module enable pin V-OVP.
  • a projector comprising the overvoltage protection circuit described above, the overvoltage protection circuit being coupled to a power control circuit of the projector.
  • the present invention provides an overvoltage protection circuit and a projector, the circuit comprising: a first detection circuit, a switch circuit, an action and a delay recovery circuit, wherein the first detection circuit is configured to detect an output voltage of the power module, When the output voltage is higher than the preset overvoltage value, a control signal is output to the switch circuit; when the switch circuit receives the control signal, the switch is turned on; when the switch circuit is turned on, the action and the delay
  • the recovery circuit triggers the overvoltage protection action, and after a preset delay period, the first detection circuit restarts detecting the output voltage of the power module, and realizes the overvoltage protection function and the action after the circuit composed of the discrete components.
  • Automatic recovery function simple circuit structure, high cost performance, RC charging and discharging circuit for delay control, rapid response, uninterrupted cycle for overvoltage protection judgment and trigger, no manual participation, and the circuit is modular design, suitable for Most power circuits are versatile and universal.
  • FIG. 1 is a schematic diagram of the function of an overvoltage protection circuit according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic diagram of another function of an overvoltage protection circuit according to Embodiment 1 of the present invention.
  • FIG. 3 is a specific circuit diagram of an overvoltage protection circuit according to Embodiment 1 of the present invention.
  • FIG. 4 is a diagram showing a relationship between voltage and current of a cathode of a Zener diode U1 according to Embodiment 1 of the present invention.
  • the reference numerals are: 10-first detection circuit, 20-switch circuit, 30-action and delay recovery circuit, 40-second detection circuit, 50-alarm module, 60-heat dissipation module.
  • an overvoltage protection circuit includes: a first detection circuit 10, a switch circuit 20, an action and delay recovery circuit 30, wherein the first detection circuit 10 is used for Detecting an output voltage of the power module, when the output voltage is higher than a preset overvoltage value, outputting a control signal to the switch circuit 20; the switch circuit 20 is turned on when receiving the control signal; the switch circuit When the 20 is turned on, the action and delay recovery circuit 30 triggers an overvoltage protection action, and after a preset delay period, the first detection circuit restarts detecting the output voltage of the power module.
  • the circuit composed of the discrete components realizes the overvoltage protection function and the automatic recovery function after the operation, the circuit structure is simple, and the cost performance is high.
  • the circuit is modular design and is suitable for most power supply circuits, and is universal. Good sex and universality.
  • the overvoltage protection circuit further includes a second detection circuit 40 for detecting the temperature of the power module.
  • the alarm module 50 sends an alarm signal, and the heat dissipation module 60 increases the heat dissipation efficiency according to the alarm signal;
  • the temperature is higher than the preset second temperature threshold, the The switching circuit 20 is turned on, and the action and delay recovery circuit 30 triggers an overvoltage protection action.
  • the overvoltage protection action is specifically: when the switch circuit is turned on, the low voltage is output to the enable pin of the power module, so that the power module stops working.
  • the second temperature threshold is greater than the first temperature threshold, that is, the temperature and alarm are used for the temperature protection in the embodiment, and the alarm is raised at a higher temperature, and the heat dissipation efficiency is improved, for example, the heat dissipation is improved. Fan speed, etc.; trip protection at high temperatures to protect equipment safety.
  • the first detecting circuit 10 includes: a resistor R5, a resistor R6, a capacitor C3, and a Zener diode U1, wherein the anode of the Zener diode U1 is grounded, and the Zener diode U1 is The reference pole is connected to one end of the resistor R5, one end of the resistor R6, and one end of the capacitor C3. The other end of the resistor R5 is grounded, the other end of the resistor R6 is connected to the output voltage terminal V-OUT, and the other end of the capacitor C3 is grounded.
  • the resistance value of the resistor R5 is 4.22 K ⁇
  • the resistance value of the resistor R6 is 22 K ⁇
  • the capacitance value of the capacitor C3 is 10 nF
  • the type of the Zener diode U1 is TL431.
  • the first detecting circuit 10 is configured to monitor the output voltage V-OUT of the power module in real time. When the voltage exceeds a preset overvoltage value, the Zener diode U1 is triggered to generate a large current at the PIN1 pin. The switch circuit 20 is notified through the circuit connection relationship to prepare an overvoltage protection action.
  • the circuit has a simple structure, real-time performance, and high flexibility.
  • the voltage and current relationship of the negative electrode of the Zener diode U1 is as shown in FIG. 4.
  • the negative voltage that is, the PIN1 pin voltage is greater than 2.5V
  • the current of the PIN1 pin rapidly increases.
  • the switch circuit 20 includes a resistor R1, a resistor R2, a capacitor C1, a transistor Q2, and a diode D1.
  • One end of the resistor R2 is connected to the cathode of the Zener diode U1, and the other end of the resistor R2.
  • the other end of the resistor R1 is connected to the other end of the capacitor C1, the emitter of the transistor Q2, and the power supply terminal VCC, and the transistor Q2
  • the collector is connected to the cathode of the diode D1.
  • the resistance of the resistor R1 is 1.2K ⁇
  • the resistance of the resistor R2 is 22K ⁇
  • the capacitance of the capacitor C1 is 0.1 ⁇ F
  • the type of the transistor Q2 is MMBT2907A
  • the diode The model number of D1 is BZT52B15.
  • the transistor Q2 is turned on, and notifies the action and delay recovery circuit 30 to perform an overvoltage protection action.
  • the circuit is sensitive and flexible. And anti-interference is good.
  • the action and delay recovery circuit 30 includes: a resistor R3, a resistor R4, a capacitor C2, and a field effect transistor Q1, wherein one end of the resistor R3 is opposite to the anode of the diode D1 and one end of the resistor R4.
  • the gates of the FET Q1 are connected together, the other end of the resistor R3 is connected to one end of the capacitor C2, the other end of the capacitor C2 is grounded, and the other end of the resistor R4 is grounded together with the source of the FET Q1, and the FET Q1 is The drain is connected to the enable pin V-OVP of the power module.
  • the resistance value of the resistor R3 is 1.5K ⁇
  • the resistance value of the resistor R4 is 3M ⁇
  • the capacitance value of the capacitor C2 is 0.47 ⁇ F
  • the type of the field effect transistor Q1 is 2N7002.
  • the action and delay recovery circuit 30 quickly performs an overvoltage protection action to ensure the safety of the device; after the protection action, the power supply voltage V-OVP is grounded, resulting in the entire
  • the voltage protection circuit has no external power supply.
  • the capacitor C2 discharges after a certain time (delay time), so that Q1 is turned off, and the overvoltage protection circuit resumes normal operation. This makes the circuit realize both the fast overvoltage protection function and the realization. Delay recovery function, and the recovery time is adjustable, which improves the user experience and meets the various needs of different users.
  • the working process of the overvoltage protection circuit is: when it is detected that the voltage of the output voltage terminal V-OUT exceeds a preset overvoltage value, the current of the PIN1 that triggers U1 becomes larger, and Q2 is turned on, from VCC. The current coming in is quickly charged to C2 through R3. Due to the charging characteristics of the capacitor, the current in the early stage of charging is relatively large, and a large drop voltage is formed on R3, so that Q1 is quickly turned on, and V-OVP is turned on to the ground. Trigger overvoltage protection function, such as the V-OVP pin connected to the IC's boot enable pin, will make the IC not enabled and stop working.
  • a projector includes, in addition to the existing structure, an overvoltage protection circuit according to the first embodiment, the overvoltage protection circuit is connected to a power supply control circuit of the projector, and an overvoltage protection circuit
  • the V-OVP end is connected to the power control circuit of the projector for overvoltage protection of the power control circuit; the circuit composed of discrete devices realizes the overvoltage protection function and the automatic recovery function after the action, the circuit structure is simple, and the cost performance is good. Higher.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Protection Of Static Devices (AREA)
  • Emergency Protection Circuit Devices (AREA)
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  • Catching Or Destruction (AREA)

Abstract

一种过压保护电路及投影机，涉及投影设备技术领域，该电路包括：第一检测电路（10）、开关电路（20）、动作和延时恢复电路（30），其中，所述第一检测电路（10）用于检测输出电压，当输出电压高于预设的过压值时，开关电路（20）导通，使所述动作和延时恢复电路（30）触发过压保护动作，并经过预设的延时时间段后，第一检测电路（10）重新开始检测电源模块的输出电压，以便于再次进行过压保护，通过分立器件组成的电路，实现了过压保护功能及动作后的自动恢复功能，电路结构简单，性价比较高，该电路为模块化设计，适用于大多数电源电路，通用性较好，具有普适性。

Description

一种过压保护电路及投影机 技术领域
本发明涉及投影设备技术领域，尤其涉及一种过压保护电路及投影机。
背景技术
在电源模块中，为了让电源模块工作更可靠，一般都必须有过压保护电路。有些控制IC没有过压保护功能，就需要用外围线路来实现；有些控制IC虽然集成有过压保护功能，但存在自身控制错乱的可能，当出现过压时，仍然不能进行有效保护。因此，现有的过压保护电路存在过压保护性能不够稳定或无法自动恢复正常输出的缺点。
发明内容
本发明的主要目的在于提出一种过压保护电路及投影机，通过分立器件组成的电路，实现了过压保护功能及动作后的自动恢复功能，电路结构简单，性价比较高。
为实现上述目的，本发明提供的一种过压保护电路，包括：第一检测电路、开关电路、动作和延时恢复电路，其中，所述第一检测电路用于检测电源模块的输出电压，当输出电压高于预设的过压值时，输出一控制信号给所述开关电路；所述开关电路接收到所述控制信号时导通；所述开关电路导通时，所述动作和延时恢复电路触发过压保护动作，并经过预设的延时时间段后，第一检测电路重新开始检测电源模块的输出电压。
可选地，所述过压保护电路还包括第二检测电路，用于检测电源模块的温度，当所述温度高于预设的第一温度阈值时，报警模块发出报警信号，散热模块根据所述报警信号提高散热效率；当所述温度高于预设的第二温度阈值时，所述开关电路导通，所述动作和延时恢复电路触发过压保护动作。
可选地，所述过压保护动作具体为：开关电路导通时，输出低电压至电源模块的使能引脚，使电源模块停止工作。
可选地，所述第二温度阈值大于所述第一温度阈值。
可选地，所述第一检测电路包括：电阻R5、电阻R6、电容C3和稳压二 极管U1，其中，稳压二极管U1的正极接地，稳压二极管U1的参考极与电阻R5的一端、电阻R6的一端及电容C3的一端连接在一起，电阻R5的另一端接地，电阻R6的另一端连接输出电压端V-OUT，电容C3的另一端接地。
可选地，所述开关电路包括：电阻R1、电阻R2、电容C1、三极管Q2和二极管D1，其中，电阻R2的一端与所述稳压二极管U1的负极连接，电阻R2的另一端与所述电阻R1的一端、电容C1的一端及三极管Q2的基极连接在一起，电阻R1的另一端与电容C1的另一端、三极管Q2的发射极及电源端VCC连接在一起，三极管Q2的集电极连接二极管D1的负极。
可选地，所述动作和延时恢复电路包括：电阻R3、电阻R4、电容C2和场效应管Q1，其中，电阻R3的一端与所述二极管D1的正极、电阻R4的一端及场效应管Q1的栅极连接在一起，电阻R3的另一端连接电容C2的一端，电容C2的另一端接地，电阻R4的另一端与场效应管Q1的源极一起接地，场效应管Q1的漏极连接电源模块的使能引脚V-OVP。
根据本发明的另一个方面，提供的一种投影机，包括以上所述的过压保护电路，所述过压保护电路与投影机的电源控制电路连接。
本发明提出的一种过压保护电路及投影机，该电路包括：第一检测电路、开关电路、动作和延时恢复电路，其中，所述第一检测电路用于检测电源模块的输出电压，当输出电压高于预设的过压值时，输出一控制信号给所述开关电路；所述开关电路接收到所述控制信号时导通；所述开关电路导通时，所述动作和延时恢复电路触发过压保护动作，并经过预设的延时时间段后，第一检测电路重新开始检测电源模块的输出电压，通过分立器件组成的电路，实现了过压保护功能及动作后的自动恢复功能，电路结构简单，性价比较高，采用RC充放电电路作延时控制，反应迅速，不间断循环进行过压保护判断与触发，无需人工参与，且该电路为模块化设计，适用于大多数电源电路，通用性较好，具有普适性。
附图说明
图1为本发明实施例一提供的一种过压保护电路功能示意图；
图2为本发明实施例一提供的另一种过压保护电路功能示意图；
图3为本发明实施例一提供的一种过压保护电路的具体电路图；
图4为本发明实施例一提供的稳压二极管U1的负极的电压与电流关系图。
其中，附图标记为：10-第一检测电路，20-开关电路，30-动作和延时恢复电路，40-第二检测电路，50-报警模块，60-散热模块。
本发明目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
在后续的描述中，使用用于表示元件的诸如“模块”、“部件”或“单元”的后缀仅为了有利于本发明的说明，其本身并没有特定的意义。因此，"模块"与"部件"可以混合地使用。
如图1所示，在本实施例中，一种过压保护电路，包括：第一检测电路10、开关电路20、动作和延时恢复电路30，其中，所述第一检测电路10用于检测电源模块的输出电压，当输出电压高于预设的过压值时，输出一控制信号给所述开关电路20；所述开关电路20接收到所述控制信号时导通；所述开关电路20导通时，所述动作和延时恢复电路30触发过压保护动作，并经过预设的延时时间段后，第一检测电路重新开始检测电源模块的输出电压。
在本实施例中，通过分立器件组成的电路，实现了过压保护功能及动作后的自动恢复功能，电路结构简单，性价比较高，该电路为模块化设计，适用于大多数电源电路，通用性较好，具有普适性。
如图2所示，为本实施例提供的另一种过压保护电路功能示意图，在本实施例中，所述过压保护电路还包括第二检测电路40，用于检测电源模块的温度，当所述温度高于预设的第一温度阈值时，报警模块50发出报警信号，散热模块60根据所述报警信号提高散热效率；当所述温度高于预设的第二温度阈值时，所述开关电路20导通，所述动作和延时恢复电路30触发过压保护动作。
在本实施例中，所述过压保护动作具体为：开关电路导通时，输出低电 压至电源模块的使能引脚，使电源模块停止工作。
在本实施例中，所述第二温度阈值大于所述第一温度阈值，也即，本实施例对温度采用报警和跳闸两级保护，较高温时报警提醒，并提高散热效率，比如提高散热风扇的转速等；高高温时跳闸保护，以保护设备安全。
如图3所示，在本实施例中，所述第一检测电路10包括：电阻R5、电阻R6、电容C3和稳压二极管U1，其中，稳压二极管U1的正极接地，稳压二极管U1的参考极与电阻R5的一端、电阻R6的一端及电容C3的一端连接在一起，电阻R5的另一端接地，电阻R6的另一端连接输出电压端V-OUT，电容C3的另一端接地。
在本实施例中，所述电阻R5的电阻值为4.22KΩ，所述电阻R6的电阻值为22KΩ，所述电容C3的电容值为10nF，所述稳压二极管U1的型号为TL431。
在本实施例中，第一检测电路10用于实时监测电源模块的输出电压V-OUT，当该电压超过预设的过压值时，触发稳压二极管U1动作，在PIN1脚产生大电流，并通过电路连接关系通知开关电路20，准备过压保护动作，该电路结构简单，且具有实时性，灵活性高。
在本实施例中，稳压二极管U1的负极的电压与电流关系图如图4所示，当负极电压也即PIN1脚电压大于2.5V时，PIN1脚的电流迅速增大。
在本实施例中，所述开关电路20包括：电阻R1、电阻R2、电容C1、三极管Q2和二极管D1，其中，电阻R2的一端与所述稳压二极管U1的负极连接，电阻R2的另一端与所述电阻R1的一端、电容C1的一端及三极管Q2的基极连接在一起，电阻R1的另一端与电容C1的另一端、三极管Q2的发射极及电源端VCC连接在一起，三极管Q2的集电极连接二极管D1的负极。
在本实施例中，所述电阻R1的电阻值为1.2KΩ，所述电阻R2的电阻值为22KΩ，所述电容C1的电容值为0.1μF，所述三极管Q2的型号为MMBT2907A，所述二极管D1的型号为BZT52B15。
在本实施例中，该开关电路20接收到第一检测电路10的大电流后，三极管Q2导通，并通知动作和延时恢复电路30进行过压保护动作，该电路反应灵敏，灵活性高，且抗干扰性好。
在本实施例中，所述动作和延时恢复电路30包括：电阻R3、电阻R4、 电容C2和场效应管Q1，其中，电阻R3的一端与所述二极管D1的正极、电阻R4的一端及场效应管Q1的栅极连接在一起，电阻R3的另一端连接电容C2的一端，电容C2的另一端接地，电阻R4的另一端与场效应管Q1的源极一起接地，场效应管Q1的漏极连接电源模块的使能引脚V-OVP。
在本实施例中，所述电阻R3的电阻值为1.5KΩ，所述电阻R4的电阻值为3MΩ，所述电容C2的电容值为0.47μF，所述场效应管Q1的型号为2N7002。
在本实施例中，当开关电路20导通时，动作和延时恢复电路30迅速进行过压保护动作，保证了设备的安全性；保护动作后，由于电源电压V-OVP接地，导致整个过压保护电路没有外部电源供电，电容C2经过一定时间(延时时间)的放电，使Q1关闭，过压保护电路恢复正常工作，这样就使得本电路既实现了快速过压保护功能，又实现了延时恢复功能，且恢复时间可调，提高了用户体验，满足不同用户的各种需求。
在本实施例中，过压保护电路的工作流程为：当检测到输出电压端V-OUT的电压超过预设的过压值时，触发U1的PIN1电流变大，使Q2导通，从VCC过来的电流，通过R3迅速给C2充电，因电容充电特性，在充电早期的电流比较大，会在R3上形成较大落差电压，使Q1快速导通，让V-OVP被导通到地，触发过压保护功能，如V-OVP脚连接到IC的开机使能脚的话，就会让IC得不到使能而停止工作。
当过压保护动作后，没有输出电压，V-OUT的电压变低，这时Q2关闭，VCC电压不再给Q1的基极供电，这时C2上存储的电荷，通过R3和R4缓慢释放，需要一定时间，才能把Q1的基极电压释放到低于门槛电压，让Q1关闭，IC恢复正常工作，如果V-OUT再次过压，又再触发而过压保护，周而始复，形成快速过压保护，并延迟再次开启过压保护的打嗝状态。
当过压故障排除后，自动恢复正常输出，V-OVP脚连接到IC正常工作。
实施例二
在本实施例中，一种投影机，除了现有的结构外，还包括实施例一所述的过压保护电路，所述过压保护电路与投影机的电源控制电路连接，过压保护电路的V-OVP端连接投影机的电源控制电路，用以对电源控制电路进行过 压保护；通过分立器件组成的电路，实现了过压保护功能及动作后的自动恢复功能，电路结构简单，性价比较高。
需要说明的是，在本文中，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者装置不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者装置所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括该要素的过程、方法、物品或者装置中还存在另外的相同要素。
上述本发明实施例序号仅仅为了描述，不代表实施例的优劣。
以上仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (8)

  1. 一种过压保护电路，其特征在于，包括：第一检测电路、开关电路、动作和延时恢复电路，其中，所述第一检测电路用于检测电源模块的输出电压，当输出电压高于预设的过压值时，输出一控制信号给所述开关电路；所述开关电路接收到所述控制信号时导通；所述开关电路导通时，所述动作和延时恢复电路触发过压保护动作，并经过预设的延时时间段后，第一检测电路重新开始检测电源模块的输出电压。
  2. 根据权利要求1所述的过压保护电路，其特征在于，所述过压保护电路还包括第二检测电路，用于检测电源模块的温度，当所述温度高于预设的第一温度阈值时，报警模块发出报警信号，散热模块根据所述报警信号提高散热效率；当所述温度高于预设的第二温度阈值时，所述开关电路导通，所述动作和延时恢复电路触发过压保护动作。
  3. 根据权利要求1所述的过压保护电路，其特征在于，所述第二温度阈值大于所述第一温度阈值。
  4. 根据权利要求1所述的过压保护电路，其特征在于，所述过压保护动作具体为：开关电路导通时，输出低电压至电源模块的使能引脚，使电源模块停止工作。
  5. 根据权利要求1所述的过压保护电路，其特征在于，所述第一检测电路包括：电阻R5、电阻R6、电容C3和稳压二极管U1，其中，稳压二极管U1的正极接地，稳压二极管U1的参考极与电阻R5的一端、电阻R6的一端及电容C3的一端连接在一起，电阻R5的另一端接地，电阻R6的另一端连接输出电压端V-OUT，电容C3的另一端接地。
  6. 根据权利要求5所述的过压保护电路，其特征在于，所述开关电路包括：电阻R1、电阻R2、电容C1、三极管Q2和二极管D1，其中，电阻R2的一端与所述稳压二极管U1的负极连接，电阻R2的另一端与所述电阻R1的一端、电容C1的一端及三极管Q2的基极连接在一起，电阻R1的另一端与电容C1的另一端、三极管Q2的发射极及电源端VCC连接在一起，三极管Q2的集电极连接二极管D1的负极。
  7. 根据权利要求6所述的过压保护电路，其特征在于，所述动作和延时 恢复电路包括：电阻R3、电阻R4、电容C2和场效应管Q1，其中，电阻R3的一端与所述二极管D1的正极、电阻R4的一端及场效应管Q1的栅极连接在一起，电阻R3的另一端连接电容C2的一端，电容C2的另一端接地，电阻R4的另一端与场效应管Q1的源极一起接地，场效应管Q1的漏极连接电源模块的使能引脚V-OVP。
  8. 一种投影机，其特征在于，包括权利要求1-7任一项所述的过压保护电路，所述过压保护电路与投影机的电源控制电路连接。
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102035169A (zh) * 2009-09-28 2011-04-27 研祥智能科技股份有限公司 一种输入过压保护电路及dc-dc电源转换装置
US20120293899A1 (en) * 2011-05-20 2012-11-22 Hon Hai Precision Industry Co., Ltd. Protection circuit
CN204333904U (zh) * 2014-12-30 2015-05-13 环维电子(上海)有限公司 一种过压保护电路
CN206442106U (zh) * 2017-01-19 2017-08-25 北京益弘泰科技发展有限责任公司 一种用于开关电源的过压保护电路
CN206542178U (zh) * 2017-03-08 2017-10-03 深圳市北高智电子有限公司 一种机顶盒天线供电的保护电路

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102237678B (zh) * 2010-04-30 2012-09-26 深圳市伟林锦龙通信技术有限公司 一种直流远供电源系统
CN103166166B (zh) * 2011-12-08 2016-06-01 迈普通信技术股份有限公司 热插拔控制器保护电路
CN203243017U (zh) * 2012-12-27 2013-10-16 中国移动通信集团内蒙古有限公司 一种直流远供电源系统的安全保护电路
CN104577993B (zh) * 2013-10-09 2018-11-09 珠海格力电器股份有限公司 开关电源输入电压保护电路
CN104577962A (zh) * 2013-10-24 2015-04-29 鸿富锦精密工业（深圳）有限公司 供电保护系统
CN104682339A (zh) * 2013-11-30 2015-06-03 鸿富锦精密工业（深圳）有限公司 过压保护电路
CN204349432U (zh) * 2014-12-17 2015-05-20 广州金升阳科技有限公司 一种开关电源过温保护电路

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102035169A (zh) * 2009-09-28 2011-04-27 研祥智能科技股份有限公司 一种输入过压保护电路及dc-dc电源转换装置
US20120293899A1 (en) * 2011-05-20 2012-11-22 Hon Hai Precision Industry Co., Ltd. Protection circuit
CN204333904U (zh) * 2014-12-30 2015-05-13 环维电子(上海)有限公司 一种过压保护电路
CN206442106U (zh) * 2017-01-19 2017-08-25 北京益弘泰科技发展有限责任公司 一种用于开关电源的过压保护电路
CN206542178U (zh) * 2017-03-08 2017-10-03 深圳市北高智电子有限公司 一种机顶盒天线供电的保护电路

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