WO2017190430A1 - 升压型直流-直流转换器 - Google Patents

升压型直流-直流转换器 Download PDF

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Publication number
WO2017190430A1
WO2017190430A1 PCT/CN2016/089754 CN2016089754W WO2017190430A1 WO 2017190430 A1 WO2017190430 A1 WO 2017190430A1 CN 2016089754 W CN2016089754 W CN 2016089754W WO 2017190430 A1 WO2017190430 A1 WO 2017190430A1
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WIPO (PCT)
Prior art keywords
circuit
voltage
output
feedback
feedback control
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Ceased
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PCT/CN2016/089754
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English (en)
French (fr)
Inventor
李文东
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US15/125,157 priority Critical patent/US10298008B2/en
Publication of WO2017190430A1 publication Critical patent/WO2017190430A1/zh
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC 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
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3696—Generation of voltages supplied to electrode drivers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • 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
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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
    • 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
    • G09G2330/04—Display protection
    • 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
    • G09G2330/12—Test circuits or failure detection circuits included in a display system, as permanent part thereof

Definitions

  • the present invention generally relates to the technical field of liquid crystal display driving circuits, and more particularly to a boost type DC-DC converter.
  • the boost type (boost type) DC-DC converter can make the output voltage higher than the input voltage.
  • the boosting process is the energy transfer process of an inductor. When charging, the inductor absorbs energy, and the inductor emits energy when discharging.
  • the step-up DC-DC converter achieves a stable output through its own boost circuit, feedback circuit and feedback control circuit. However, when the output is short-circuited, the input power supply forms a short-circuit loop through the inductor and the rectifier diode, causing a power failure.
  • the circuit when input undervoltage, overvoltage, output overcurrent, short circuit, overvoltage, over temperature, the circuit is required to automatically turn off the output, or achieve snoring protection to facilitate the back load or The circuit is protected in time to avoid damage; but for the step-up DC-DC converter, since the inductor and the rectifier diode are connected in series in the input and output circuits, the output cannot be completely completed even if the switch is completely turned off. shut down.
  • the present invention provides a step-up DC-DC converter including: a boost circuit, a protection circuit, a detection circuit, a feedback control circuit, and a feedback circuit; and the boost circuit is An external output voltage, the protection circuit controls a voltage that the boost circuit outputs to the outside according to an output current of the booster circuit; the detection circuit detects an output voltage of the protection circuit, and controls according to the detected output voltage Whether the feedback control circuit performs feedback control on the boost circuit according to a feedback voltage of the feedback circuit.
  • the protection circuit prevents the voltage output by the booster circuit from being output to the outside; if the output current of the booster circuit is less than a predetermined threshold, The protection circuit outputs the voltage output from the booster circuit to the outside.
  • the detecting circuit controls the The feedback control circuit does not perform feedback control on the booster circuit according to the feedback voltage of the feedback circuit; if the voltage value of the output voltage detected by the detection circuit is not zero, the detection circuit controls the feedback control circuit to perform The boost circuit is feedback controlled according to the feedback voltage of the feedback circuit.
  • the protection circuit includes: a self-recovering fuse; one end of the self-recovering fuse is connected to an output end of the boosting circuit, and the other end of the self-recovering fuse is used as an output end of the step-up DC-DC converter .
  • the detecting circuit includes: a first resistor and a Zener diode; one end of the first resistor is connected to an output end of the protection circuit, and the other end of the first resistor is connected to the Zener diode and The feedback control circuit.
  • the other end of the first resistor is connected to the cathode of the Zener diode, and the anode of the Zener diode is grounded.
  • the detection circuit further includes: a second resistor; the other end of the first resistor is connected to the feedback control circuit via the second resistor.
  • the invention provides a step-up DC-DC converter, which controls an externally outputted voltage through an added protection circuit, and simultaneously detects a output voltage of the protection circuit by using a detection circuit, and controls the feedback control circuit according to the detected output voltage. Whether to perform feedback control on the boosting circuit according to the feedback voltage of the feedback circuit.
  • the boost type DC-DC converter achieves the effect of completely short-circuiting the output short circuit and reducing the power consumption by adding a protection circuit and a detection circuit.
  • FIG. 1 is a circuit diagram showing a step-up DC-DC converter of an embodiment of the present invention.
  • FIG. 2 shows a specific example of the step-up DC-DC converter circuit of FIG. 1.
  • a boost type DC-DC converter according to an embodiment of the present invention will be described below with reference to FIGS. 1 through 2.
  • a boost type DC-DC converter is provided in an embodiment of the present invention, including: a booster circuit 10, a protection circuit 20, a detection circuit 30, a feedback control circuit 40, and a feedback circuit 50; and a booster circuit 10
  • the voltage is output to the outside via the protection circuit 20, and the protection circuit 20 controls the voltage that the booster circuit 10 outputs to the outside according to the output current of the booster circuit 10; the detection circuit 30 detects the output voltage of the protection circuit 20, and controls according to the detected output voltage.
  • the feedback control circuit 40 performs feedback control of the booster circuit 10 based on the feedback voltage of the feedback circuit 50.
  • the protection circuit 20 prevents the voltage output from the booster circuit 10 from being output to the outside; if the booster circuit 10 The output current is less than a predetermined threshold (such as the normal working state of the circuit), then the protection is The path 20 outputs the voltage output from the booster circuit 10 to the outside.
  • a predetermined threshold such as an output short-circuit fault
  • FIG. 2 shows a specific example of the step-up DC-DC converter circuit of FIG. 1.
  • the protection circuit 20 includes: a Poly Positive Voltage Coefficient (PPTC); one end of the self-recovery fuse 22 is connected to the output terminal of the booster circuit 10, and the other end of the self-recovery fuse 22 is used as a step-up DC. - The output of the DC converter. If the output current of the booster circuit 10 is greater than or equal to a predetermined threshold, the self-recovery fuse 22 prevents the voltage output from the booster circuit 10 from being output to the outside; if the output current of the booster circuit 10 is less than a predetermined threshold, the self-recovery fuse 22 will The voltage output from the booster circuit 10 is output to the outside.
  • PPTC Poly Positive Voltage Coefficient
  • the self-recovering fuse is an overcurrent electronic protection component consisting of a specially treated polymer resin (Polymer) and conductive particles (such as Carbon Black) distributed therein.
  • Polymer polymer
  • conductive particles such as Carbon Black
  • the polymer resin tightly binds the conductive particles to the crystal structure, forming a chain-like conductive path.
  • the self-recovering fuse is in a low-resistance state, and the heat generated by the current flowing through the self-recovering fuse on the line is small. Does not change the crystal structure.
  • the heat generated by the large current flowing through the self-recovering fuse causes the polymer resin to melt, the volume rapidly increases, the high-resistance state is formed, and the operating current is rapidly reduced, thereby limiting and protecting the circuit.
  • the self-recovery fuse re-cools and crystallizes, the volume shrinks, the conductive particles re-form the conductive path, and the self-recovery fuse returns to a low-resistance state, thereby completing the protection of the circuit without manual replacement.
  • the detection circuit 30 controls the feedback control circuit 40 not to perform the feedback voltage according to the feedback circuit 50.
  • the feedback control is performed on the booster circuit 10; if the voltage value of the output voltage of the protection circuit 20 detected by the detection circuit 30 is not zero (such as a normal operating state of the circuit), the detection circuit 30 controls the feedback control circuit 40 to perform the feedback circuit 50 according to the feedback circuit 50.
  • the feedback voltage is feedback controlled to the booster circuit 10.
  • the detecting circuit 30 includes: a first resistor R 1 and a Zener diode D 1 ; one end of the first resistor R 1 is connected to the output of the protection circuit 20, and the other end of the first resistor R 1 is connected to the stable The diode D 1 and the feedback control circuit 40 are pressed. Specifically, the other end of the first resistors R 1 is connected to the cathode of the Zener diode D 1, the anode of Zener diode D 1 is grounded.
  • the protection circuit 30 detects the output voltage detection circuit 20 via the Vout of the first resistor R reaches the Zener diode D 1 after the operating conditions 1, a Zener diode D to work, so that the detection circuit 30 outputs to the feedback control
  • the voltage of the circuit 40 is the regulated value of the Zener diode D 1 .
  • the first resistor device has a limited current protection function, so that the current flowing through the Zener diode is small, and the effect of protecting the Zener diode is achieved.
  • the detecting circuit 30 further includes: a second resistor R 2 ; the other end of the first resistor R 1 is connected to the feedback control circuit 40 via the second resistor R 2 .
  • the booster circuit 10 receives the input DC voltage Vin, and outputs a voltage Vout to the outside via the protection circuit 20, and the protection circuit 20 controls the voltage that the booster circuit 10 outputs to the outside based on the output current of the booster circuit 10; the detection circuit 30 detects the protection circuit 20 output voltage Vout, and based on the detected output The voltage Vout controls whether the feedback control circuit 40 performs feedback control of the booster circuit 10 in accordance with the feedback voltage of the feedback circuit 50.
  • the protection circuit 20 prevents the voltage output from the booster circuit 10 from being output to the outside, thereby cutting off the voltage output to the outside; in this case,
  • the detection circuit 30 controls the feedback control circuit 40 not to perform feedback control on the booster circuit 10 according to the feedback voltage of the feedback circuit 50, thereby realizing an output short circuit. Completely turn off the output for short-circuit protection and reduced power consumption.
  • the protection circuit 20 After the output short-circuit fault is removed, that is, the boost type DC-DC converter operates normally, and the output current of the booster circuit 10 is less than a predetermined threshold, the protection circuit 20 outputs the voltage output from the booster circuit 10 to the outside; in this case, The voltage value of the output voltage of the protection circuit 20 detected by the detection circuit 30 is not zero (it should be understood that the voltage value is one of the input DC voltage Vin, the output voltage Vout, or the input DC voltage Vin to the output voltage Vout). The voltage value), the detection circuit 30 controls the feedback control circuit 40 to perform feedback control of the booster circuit 10 according to the feedback voltage of the feedback circuit 50.
  • step-up DC-DC converter By adopting the above-mentioned step-up DC-DC converter according to the embodiment of the present invention, by adding a protection circuit and a detection circuit, the output is completely turned off when the output is short-circuited, and the short-circuit protection and the power consumption reduction effect are achieved.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Dc-Dc Converters (AREA)

Abstract

一种升压型直流-直流转换器，包括：升压电路（10）、保护电路（20）、检测电路（30）、反馈控制电路（40）和反馈电路（50）；升压电路（10）经由保护电路（20）向外部输出电压，保护电路（20）根据升压电路（10）的输出电流，控制升压电路（10）向外部输出的电压；检测电路（30）检测保护电路（20）的输出电压（Vout），并根据检测的输出电压控制反馈控制电路（40）是否根据反馈电路（50）的反馈电压对升压电路（10）进行反馈控制。升压型直流-直流转换器通过增加保护电路和检测电路，实现输出短路时完全关闭输出，达到短路保护和减小电能消耗的效果。

Description

升压型直流-直流转换器 技术领域
本发明总体说来涉及液晶显示器驱动电路的技术领域，更具体地讲，涉及一种升压型直流-直流转换器。
背景技术
升压型(boost型)直流-直流转换器可以使输出电压比输入电压高，其升压过程就是一个电感的能量传递过程，即充电时，电感吸收能量，放电时电感放出能量。升压型直流-直流转换器通过自身的升压电路、反馈电路和反馈控制电路来实现稳定输出。但是，当输出短路时，输入电源会通过电感、整流二极管形成短路回路，导致电源故障。
对于一般的保护电路而言，当输入欠压、过压，输出过流、短路、过压、过温度的时候，要求电路可以自动关闭输出，或实现打嗝式的保护，以利于后面的负载或电路受到及时的保护，避免损坏；但对于升压型直流-直流转换器而言，因电感、整流二极管是串联在输入与输出的回路中，即使是完全关闭开关管的驱动，输出也不能完全关闭。
因此，亟需开发一种新型的升压型直流-直流转换器，以解决上述存在的问题。
发明内容
本发明的目的在于提供一种升压型直流-直流转换器，通过增加保护电路和检测电路，实现输出短路时完全关闭输出，达到短路保护和减小电能消耗的效果。
为实现上述发明目的，本发明提供一种升压型直流-直流转换器，包括：升压电路、保护电路、检测电路、反馈控制电路和反馈电路；所述升压电路经由所述保护电路向外部输出电压，所述保护电路根据所述升压电路的输出电流，控制所述升压电路向外部输出的电压；所述检测电路检测所述保护电路的输出电压，并根据检测的输出电压控制所述反馈控制电路是否根据所述反馈电路的反馈电压对升压电路进行反馈控制。
如果所述升压电路的输出电流大于或等于预定阈值，则所述保护电路阻止将所述升压电路输出的电压输出到外部；如果所述升压电路的输出电流小于预定阈值，则所述保护电路将所述升压电路输出的电压输出到外部。
如果所述检测电路检测的输出电压的电压值为零，则所述检测电路控制所 述反馈控制电路不执行根据所述反馈电路的反馈电压对升压电路进行反馈控制；如果所述检测电路检测的输出电压的电压值不为零，则所述检测电路控制所述反馈控制电路执行根据所述反馈电路的反馈电压对升压电路进行反馈控制。
所述保护电路包括：自恢复保险丝；所述自恢复保险丝的一端连接到所述升压电路的输出端，所述自恢复保险丝的另一端作为所述升压型直流-直流转换器的输出端。
所述检测电路包括：第一电阻器和稳压二极管；所述第一电阻器的一端连接到所述保护电路的输出端，所述第一电阻器的另一端连接到所述稳压二极管和所述反馈控制电路。
所述第一电阻器的另一端连接到所述稳压二极管的阴极，所述稳压二极管的阳极接地。
所述检测电路还包括：第二电阻器；所述第一电阻器的另一端经由所述第二电阻器连接到所述反馈控制电路。
本发明提供一种升压型直流-直流转换器，通过增加的保护电路控制向外部输出的电压，同时，采用检测电路检测保护电路的输出电压，并根据检测的输出电压控制所述反馈控制电路是否根据所述反馈电路的反馈电压对升压电路进行反馈控制。所述升压型直流-直流转换器通过增加保护电路和检测电路，实现输出短路时完全关闭输出，达到短路保护和减小电能消耗的效果。
附图说明
图1示出本发明实施例的升压型直流-直流转换器的电路示意图。
图2示出图1的升压型直流-直流转换器电路的一个具体示例。
具体实施方式
下面参照图1至图2描述根据本发明的实施例的升压型直流-直流转换器。
图1示出根据本发明实施例的升压型直流-直流转换器的电路示意图。参照图1，本发明的实施例中提出一种升压型直流-直流转换器，包括：升压电路10、保护电路20、检测电路30、反馈控制电路40和反馈电路50；升压电路10经由保护电路20向外部输出电压，保护电路20根据升压电路10的输出电流，控制升压电路10向外部输出的电压；检测电路30检测保护电路20的输出电压，并根据检测的输出电压控制反馈控制电路40是否根据反馈电路50的反馈电压对升压电路10进行反馈控制。
在本实施例中，如果升压电路10的输出电流大于或等于预定阈值(如发生输出短路故障)，则保护电路20阻止将升压电路10输出的电压输出到外部；如果升压电路10的输出电流小于预定阈值(如电路正常工作状态)，则保护电 路20将升压电路10输出的电压输出到外部。
图2示出图1的升压型直流-直流转换器电路的一个具体示例。
参照图2，保护电路20包括：自恢复保险丝22(Polymer Positive Temperature Coefficient，PPTC)；自恢复保险丝22的一端连接到升压电路10的输出端，自恢复保险丝22的另一端作为升压型直流-直流转换器的输出端。如果升压电路10的输出电流大于或等于预定阈值，则自恢复保险丝22阻止将升压电路10输出的电压输出到外部；如果升压电路10的输出电流小于预定阈值，则自恢复保险丝22将升压电路10输出的电压输出到外部。
具体地，自恢复保险丝是一种过流电子保护元件，是由经过特殊处理的聚合树脂(Polymer)及分布在里面的导电粒子(如碳黑(Carbon Black))组成。在正常操作下聚合树脂紧密地将导电粒子束缚在结晶状的结构外，构成链状导电通路，此时的自恢复保险丝为低阻状态，线路上流经自恢复保险丝的电流所产生的热能小，不会改变晶体结构。当线路发生短路或过载时，流经自恢复保险丝的大电流产生的热量使聚合树脂融化，体积迅速增长，形成高阻状态，工作电流迅速减小，从而对电路进行限制和保护。当故障排除后，自恢复保险丝重新冷却结晶，体积收缩，导电粒子重新形成导电通路，自恢复保险丝恢复为低阻状态，从而完成对电路的保护，无须人工更换。
在本实施例中，如果检测电路30检测的保护电路20的输出电压的电压值为零(如发生输出短路故障，)，则检测电路30控制反馈控制电路40不执行根据反馈电路50的反馈电压对升压电路10进行反馈控制；如果检测电路30检测的保护电路20的输出电压的电压值不为零(如电路正常工作状态)，则检测电路30控制反馈控制电路40执行根据反馈电路50的反馈电压对升压电路10进行反馈控制。
作为示例，检测电路30包括：第一电阻器R1和稳压二极管D1；第一电阻器R1的一端连接到保护电路20的输出端，第一电阻器R1的另一端连接到稳压二极管D1和反馈控制电路40。具体地，第一电阻器R1的另一端连接到稳压二极管D1的阴极，稳压二极管D1的阳极接地。应当理解，检测电路30检测的保护电路20的输出电压Vout经由第一电阻器R1后达到稳压二极管D1的工作条件时，稳压二极管D1开始工作，使检测电路30输出至反馈控制电路40的电压为稳压二极管D1的稳压值。在本示例中，第一电阻器具有限流保护的作用，使流经稳压二极管的电流较小，达到保护稳压二极管的效果。
优选地，检测电路30还包括：第二电阻器R2；第一电阻器R1的另一端经由第二电阻器R2连接到反馈控制电路40。
本实施例提供的升压型直流-直流转换器的工作过程为：
升压电路10接收输入的直流电压Vin，经由保护电路20向外部输出电压Vout，保护电路20根据升压电路10的输出电流，控制升压电路10向外部输出的电压；检测电路30检测保护电路20的输出电压Vout，并根据检测的输出 电压Vout控制反馈控制电路40是否根据反馈电路50的反馈电压对升压电路10进行反馈控制。
具体地，当输出短路时，升压电路10的输出电流大于或等于预定阈值，则保护电路20阻止将升压电路10输出的电压输出到外部，从而切断向外部输出的电压；在此情况下，检测电路30检测的保护电路20的输出电压Vout的电压值为零，则检测电路30控制反馈控制电路40不执行根据反馈电路50的反馈电压对升压电路10进行反馈控制，实现输出短路时完全关闭输出，达到短路保护和减小电能消耗的效果。
当输出短路故障排除后，即升压型直流-直流转换器正常工作，升压电路10的输出电流小于预定阈值，则保护电路20将升压电路10输出的电压输出到外部；在此情况下，检测电路30检测的保护电路20的输出电压的电压值不为零(应当理解，该电压值为输入的直流电压Vin、输出电压Vout、或者输入的直流电压Vin至输出电压Vout中的某一电压值)，则检测电路30控制反馈控制电路40执行根据反馈电路50的反馈电压对升压电路10进行反馈控制。
采用上述根据本发明实施例的升压型直流-直流转换器，通过增加保护电路和检测电路，实现输出短路时完全关闭输出，达到短路保护和减小电能消耗的效果。
上面已经结合具体实施例描述了本发明，但是本发明的实施不限于此。在本发明的精神和范围内，本领域技术人员可以进行各种修改和变型，这些修改和变型将落入权利要求限定的保护范围之内。

Claims (10)

  1. 一种升压型直流-直流转换器，其中，包括：升压电路、保护电路、检测电路、反馈控制电路和反馈电路；
    所述升压电路经由所述保护电路向外部输出电压，所述保护电路根据所述升压电路的输出电流，控制所述升压电路向外部输出的电压；
    所述检测电路检测所述保护电路的输出电压，并根据检测的输出电压控制所述反馈控制电路是否根据所述反馈电路的反馈电压对升压电路进行反馈控制。
  2. 如权利要求1所述的升压型直流-直流转换器，其中，如果所述升压电路的输出电流大于或等于预定阈值，则所述保护电路阻止将所述升压电路输出的电压输出到外部。
  3. 如权利要求1所述的升压型直流-直流转换器，其中，如果所述升压电路的输出电流小于预定阈值，则所述保护电路将所述升压电路输出的电压输出到外部。
  4. 如权利要求1所述的升压型直流-直流转换器，其中，如果所述检测电路检测的输出电压的电压值为零，则所述检测电路控制所述反馈控制电路不执行根据所述反馈电路的反馈电压对升压电路进行反馈控制。
  5. 如权利要求1所述的升压型直流-直流转换器，其中，如果所述检测电路检测的输出电压的电压值不为零，则所述检测电路控制所述反馈控制电路执行根据所述反馈电路的反馈电压对升压电路进行反馈控制。
  6. 如权利要求1所述的升压型直流-直流转换器，其中，所述保护电路包括：自恢复保险丝。
  7. 如权利要求6所述的升压型直流-直流转换器，其中，所述自恢复保险丝的一端连接到所述升压电路的输出端，所述自恢复保险丝的另一端作为所述升压型直流-直流转换器的输出端。
  8. 如权利要求1所述的升压型直流-直流转换器，其中，所述检测电路包括：第一电阻器和稳压二极管；
    所述第一电阻器的一端连接到所述保护电路的输出端，所述第一电阻器的另一端连接到所述稳压二极管和所述反馈控制电路。
  9. 如权利要求8所述的升压型直流-直流转换器，其中，所述第一电阻器的另一端连接到所述稳压二极管的阴极，所述稳压二极管的阳极接地。
  10. 如权利要求8所述的升压型直流-直流转换器，其中，所述检测电路还包括：第二电阻器；
    所述第一电阻器的另一端经由所述第二电阻器连接到所述反馈控制电路。
PCT/CN2016/089754 2016-05-04 2016-07-12 升压型直流-直流转换器 Ceased WO2017190430A1 (zh)

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