WO2014043977A1 - 一种电源系统及其启动方法 - Google Patents

一种电源系统及其启动方法 Download PDF

Info

Publication number
WO2014043977A1
WO2014043977A1 PCT/CN2012/083504 CN2012083504W WO2014043977A1 WO 2014043977 A1 WO2014043977 A1 WO 2014043977A1 CN 2012083504 W CN2012083504 W CN 2012083504W WO 2014043977 A1 WO2014043977 A1 WO 2014043977A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit
switch
coupled
precharge
loop
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2012/083504
Other languages
English (en)
French (fr)
Inventor
杨翔
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TCL China Star Optoelectronics Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US13/699,742 priority Critical patent/US9025349B2/en
Publication of WO2014043977A1 publication Critical patent/WO2014043977A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

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

Definitions

  • the present invention relates to the field of liquid crystal display, and more particularly to a power supply system and a method for starting the same. ⁇ Background technique ⁇
  • the liquid crystal display device usually uses a pulse width adjusting circuit to control the operation of the power supply circuit.
  • a pulse width adjusting circuit to control the operation of the power supply circuit.
  • the power supply circuit is turned on and off, an inrush current or an output voltage overshoot occurs, and the pulse width adjusting circuit and the pulse width adjusting circuit are easily Some other electronic components cause damage, therefore, the liquid crystal display device
  • CONVERTER converter
  • a soft start circuit In order to make the input current not too large, a soft start circuit is added. In general, the soft start circuit preferentially controls the power supply DUTY (duty cycle) to control the input current. Switch to loop circuit control when the voltage rises to a certain point. During the switching process, the voltage on the loop capacitor in the loop circuit gradually increases from zero. When the voltage of the loop capacitor rises from zero, the PWM output suddenly decreases. If the voltage of the loop capacitor is too large, Will cause the output voltage to be abnormal.
  • the technical problem to be solved by the present invention is to provide a power supply system in which the PWM output changes little or unchanged during the process of switching the soft start circuit to the loop circuit.
  • a power supply system comprising: a power output circuit
  • a soft start circuit coupled to an input of the power output circuit
  • a loop capacitor is disposed in the loop circuit
  • a precharge circuit for charging the loop capacitor, the precharge circuit charging the loop capacitor before the power system is switched to supply power to the loop circuit;
  • An input end of the precharge circuit is coupled to the constant current source, and an output end of the precharge circuit is capacitively coupled to the loop;
  • the precharge circuit is provided with a precharge switch, and the precharge switch is at a power source The system is switched on before the loop circuit is powered;
  • the constant current source is coupled to the power supply output circuit through a soft start switch;
  • the precharge circuit is coupled to the loop capacitor through the precharge switch;
  • the loop circuit is coupled to the power output circuit via a switch;
  • the soft start switch and the precharge switch have the same control logic and are opposite to the control logic of the switch;
  • the soft start circuit includes a first comparator, a comparator of the first comparator is coupled to the first reference voltage, and a reference terminal is coupled to the constant current source and coupled to the ground of the power system via a soft start capacitor; a control end coupled to the soft start switch, the precharge switch, and the switch;
  • the loop circuit includes a second comparator, a reference voltage of the second comparator is coupled to a second reference voltage, a comparison end is coupled with load feedback, and an output end is coupled to the power output circuit through the switch; the output end and the comparison Loop capacitors are connected in series between the terminals;
  • the first comparator drives the soft start switch and the precharge switch to be turned on, and drives the switch to be turned off; when the soft start capacitor is fully charged and the voltage is higher than the first reference voltage, The first comparator drives the soft start switch and the precharge switch to be turned off, and drives the switch to be turned on.
  • a power supply system comprising: a power output circuit
  • a soft start circuit coupled to an input of the power output circuit
  • a loop capacitor is disposed in the loop circuit; the power system further includes a precharge circuit for charging the loop capacitor, and the precharge circuit is the power output of the soft start circuit The loop capacitor is charged while the circuit is charging.
  • an input end of the precharge circuit is coupled to the constant current source, and the precharge circuit
  • the output is capacitively coupled to the loop.
  • the loop capacitor is charged by the constant current source to make the loop capacitor have a certain voltage.
  • the pre-charging circuit is provided with a pre-charging switch, and the pre-charging switching power supply system is switched on before being switched to the loop circuit for supplying power.
  • the constant current source is coupled to a power output circuit through a soft start switch; the precharge circuit is coupled to the loop capacitor through the precharge switch; and the loop circuit is coupled to a power output circuit through a switch
  • the soft start switch and the precharge switch have the same control logic and are opposite to the control logic of the switch.
  • the soft start circuit includes a first comparator, a comparator of the first comparator is coupled to the first reference voltage, and a reference terminal is coupled to the constant current source and coupled to the ground of the power system via a soft start capacitor;
  • the output ends are respectively coupled to the soft start switch, the precharge switch, and the control end of the switch;
  • the loop circuit includes a second comparator, the reference terminal of the second comparator is coupled with a second reference voltage, and the comparison terminal is coupled With load feedback, the output terminal is coupled to the power output circuit through the switch; the loop capacitance is connected in series between the output terminal and the comparison terminal;
  • the first comparator drives the soft start switch and the precharge switch to be turned on, and drives the switch to be turned off; when the soft start capacitor is fully charged and the voltage is higher than the first reference voltage, The first comparator drives the soft start switch and the precharge switch to be turned off, and drives the switch to be turned on.
  • a method for starting a power system comprising:
  • A The soft start step, the control output is gradually increased from the small to the preset normal value through the soft start circuit;
  • B the normal start step, after the output reaches the preset normal value in step A, the switch is switched to the normal control output of the loop circuit;
  • step A the loop capacitance in the loop circuit is precharged while the soft start step is performed.
  • the soft start circuit is powered by a constant current source, and the loop capacitor is also powered by the constant current source.
  • the loop capacitance is charged by a precharge circuit, an input end of the precharge circuit is coupled to the constant current source, and an output end of the precharge circuit is capacitively coupled to the loop.
  • the precharge circuit is provided with a precharge switch coupled to the loop capacitor through the precharge switch, and the soft start circuit simultaneously drives the precharge switch to enable the precharge switch when the soft start circuit controls the power supply system
  • the charging switch is turned on; when the soft start circuit ends the control, the soft start circuit simultaneously drives the precharge switch to turn off.
  • the pre-charge switch is a triode.
  • the loop circuit Since the power supply system of the present invention switches to the loop circuit control before switching to the loop circuit control in the soft start step, the loop circuit does not need to charge the loop capacitor again, thus avoiding the need for the loop capacitor. Charging causes the output voltage to be abnormal.
  • FIG. 1 is a circuit diagram of a start control circuit of a power supply system according to an embodiment of the present invention
  • FIG. 2 is a flow chart of a method for starting a power supply system according to an embodiment of the present invention.
  • soft start circuit 20
  • loop circuit 30
  • pre-charge circuit 40
  • constant current source 50
  • output circuit 20
  • the power supply system includes: a power output circuit 50, a soft start circuit 10, a constant current source 40 for supplying power to the soft start circuit 10, and a loop circuit 20, as shown in FIG.
  • a loop capacitor C3 is disposed in the loop circuit 20; an input end of the soft start circuit 10 is coupled to the constant current source 40, and an output end thereof is coupled to an input end of the power output circuit 50, the loop circuit An output of 20 is coupled to an input of the power output circuit 50; the power supply system further includes a precharge circuit 30 for charging the loop capacitor C3, the precharge circuit 30 switching to the power system Ring
  • the loop capacitor C3 is charged before the circuit 20 is powered (ie, switched to the output of the loop circuit control power system).
  • the power supply system is preferentially controlled by the soft start circuit 10 at startup, and the constant current source 40 is coupled to the power supply output circuit 50 via a soft start switch T1; the precharge circuit 30 is coupled to the loop capacitor through the precharge switch T2 C3; The loop circuit 20 is coupled to the power supply output circuit 50 through the switch T3; the control logic of the soft start switch T1 and the precharge switch T2 is the same, and is opposite to the control logic of the switch T3.
  • the soft start circuit 10 includes: a first comparator U3A, a comparison terminal of the first comparator U3A is coupled to the first reference voltage VREF2, and a reference terminal is coupled to the constant current source and coupled to the ground of the power system through the soft start capacitor C4;
  • the output terminals are respectively coupled to the soft start switch T1, the precharge switch ⁇ 2, and the control terminal of the switch ⁇ 3.
  • the loop circuit 20 includes a second comparator U4B, the reference terminal of the second comparator U4B is coupled with a second reference voltage VREF1, the comparator is coupled with load feedback, the output is coupled to the power output circuit 50 through the switch ⁇ 3; A loop capacitor C3 is connected in series between the output terminal and the comparison terminal.
  • the soft start capacitor C4 When the soft start circuit controls the output of the power system, the soft start capacitor C4 is not fully charged, and its voltage is less than the first reference voltage VREF2, and the first comparator U3A outputs a low level drive soft start switch T1 and the precharge switch T2 are turned on. , and drive the switch T3 off
  • the soft start circuit 10 After the output controlled by the soft start circuit 10 reaches the preset normal value, that is, the soft start circuit 10 ends the output control of the power supply system, the soft start capacitor C4 is fully charged, and its voltage is higher than the first reference voltage VREF2, the first comparator U3A The output of a high level (ie, the SSOK signal shown) drives the soft start switch T1 and the precharge switch T2 to be turned off, and drives the switch T3 to be turned on. At this time, the soft start circuit 10 stops controlling the output of the power supply system, and switches to the loop circuit 20 for control.
  • a high level ie, the SSOK signal shown
  • the loop capacitor C3 is charged by the precharge circuit 30 during the period in which the power supply system controls the output by the soft start circuit 10.
  • An input of the precharge circuit 30 is coupled to the constant current source 40, and an output thereof is coupled to the loop capacitor C3.
  • the circuit capacitor C3 is charged by the constant current source 40 to reach the normal voltage at the end of the soft start.
  • the loop circuit 20 supplies the power supply output circuit 50 with a loop capacitance C3.
  • the influence of the power supply process of the loop circuit 20 is small or even unaffected, so that the influence on the output circuit 50 is also small or does not affect the output circuit 50, so that the output circuit 50 reaches a stable value to operate normally.
  • the pre-charge switch T2 is a triode, and the triode is a PNP-type switch; the control end of the triode is coupled to the output of the first comparator of the soft-start circuit.
  • the input terminal of the precharge circuit is coupled to the constant current source 40, that is, the loop capacitance is substantially directly charged by the constant current source 40.
  • the input terminal of the precharge circuit can also be coupled to other power sources. It is not limited to the manner provided by the embodiment.
  • Figure 2 shows the startup method of the power system, which includes:
  • the soft start step preferentially controls the output from the small to the preset normal value through the soft start circuit; the loop capacitance in the loop circuit is precharged while the soft start step is performed.
  • step B The normal startup step, after the output reaches the preset normal value in step A, switching to the loop circuit normal control output;
  • the power system precharges the loop capacitor to have a certain voltage.
  • the voltage of the loop capacitor remains at the end of the soft start. The voltage is the same, that is, the normal value is reached; since the loop capacitance has a certain voltage, the loop capacitor is no longer charged when the loop circuit supplies power to the output circuit, or the loop capacitor does not when the loop circuit supplies power to the output circuit. It has little or no effect on it, so that the voltage on the output circuit can reach a stable value and work normally.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Direct Current Feeding And Distribution (AREA)

Description

一种电源系统及其启动方法
【技术领域】
本发明涉及液晶显示领域， 更具体的说， 涉及一种电源系统及其启动方法。 【背景技术】
液晶显示装置通常用脉沖宽度调整电路来控制其电源电路工作， 但是， 该 电源电路在接通和关闭瞬间， 会产生沖击电流或输出电压过沖的现象， 很容易 对该脉沖宽度调整电路及其它一些电子元件造成损害， 因此， 液晶显示装置的
CONVERTER (转换器）或者其他电源系统中。 为使得输入电流不会太大， 会 加入软启动电路。 一般情况下软启动电路优先控制电源的驱动 DUTY (占空比） 从而控制输入电流。 在电压上升到一定时候， 切换到环路电路控制。 在切换过 程中， 环路电路中的环路电容上的电压由零逐渐增大， 环路电容的电压从零爬 升时间内， PWM输出突然较小， 此时如果环路电容的电压过大就会造成输出电 压异常。
【发明内容】
本发明所要解决的技术问题是提供一种在软启动电路切换到环路电路过程 中， PWM输出变化较小或不变的电源系统。
本发明的目的是通过以下技术方案来实现的： 一种电源系统， 包括： 电源输出电路；
与所述电源输出电路的输入端耦合的软启动电路；
为软启动电路供电的恒流源；
以及与所述电源输出电路耦合的环路电路；
所述的环路电路内设有环路电容；
用于给所述环路电容充电的预充电电路， 所述预充电电路在电源系统切换 到环路电路供电之前为所述环路电容充电； 所述预充电电路的输入端与所述恒流源耦合， 所述预充电电路的输出端与 所述环路电容耦合； 所述预充电电路设置有一预充电开关， 所述预充电开关在 电源系统切换到环路电路供电之前导通；
所述恒流源通过软启动开关耦合到电源输出电路； 所述预充电电路通过所 述预充电开关耦合到所述环路电容； 所述环路电路通过切换开关耦合到电源输 出电路； 所述软启动开关和预充电开关的控制逻辑相同， 并跟切换开关的控制 逻辑相反；
所述软启动电路包括第一比较器， 第一比较器的比较端耦合到第一基准电 压， 其基准端耦合到恒流源并通过软启动电容耦合到电源系统的接地端； 其输 出端分别耦合到软启动开关、 预充电开关以及切换开关的控制端；
所述环路电路包括第二比较器， 所述第二比较器的基准端耦合有第二基准 电压， 其比较端耦合有负载反馈， 输出端通过切换开关耦合到电源输出电路； 输出端和比较端之间串接有环路电容；
当软启动电容电压小于第一基准电压时， 第一比较器驱动软启动开关和预 充电开关导通， 并驱动切换开关关闭； 当软启动电容充满电， 其电压高于第一 基准电压时， 第一比较器驱动软启动开关和预充电开关关闭， 并驱动切换开关 导通。
本发明的目的还可以通过以下技术方案来实现： 一种电源系统， 包括： 电源输出电路；
与所述电源输出电路的输入端耦合的软启动电路；
为软启动电路供电的恒流源；
以及与所述电源输出电路耦合的环路电路；
所述的环路电路内设有环路电容； 所述电源系统还包括一用于给所述环路 电容充电的预充电电路， 所述预充电电路在所述软启动电路为所述电源输出电 路充电时为所述环路电容充电。
优选的， 所述预充电电路的输入端与所述恒流源耦合， 所述预充电电路的 输出端与所述环路电容耦合。 通过恒流源为环路电容充电， 使环路电容拥有一 定的电压。
优选的， 所述预充电电路设置有一预充电开关， 所述预充电开关电源系统 切换到环路电路供电之前导通。
优选的， 所述恒流源通过软启动开关耦合到电源输出电路； 所述预充电电 路通过所述预充电开关耦合到所述环路电容； 所述环路电路通过切换开关耦合 到电源输出电路； 所述软启动开关和预充电开关的控制逻辑相同， 并跟切换开 关的控制逻辑相反。
优选的， 所述软启动电路包括第一比较器， 第一比较器的比较端耦合到第 一基准电压， 其基准端耦合到恒流源并通过软启动电容耦合到电源系统的接地 端； 其输出端分别耦合到软启动开关、 预充电开关以及切换开关的控制端； 所述环路电路包括第二比较器， 所述第二比较器的基准端耦合有第二基准 电压， 其比较端耦合有负载反馈， 输出端通过切换开关耦合到电源输出电路； 输出端和比较端之间串接有环路电容；
当软启动电容电压小于第一基准电压时， 第一比较器驱动软启动开关和预 充电开关导通， 并驱动切换开关关闭； 当软启动电容充满电， 其电压高于第一 基准电压时， 第一比较器驱动软启动开关和预充电开关关闭， 并驱动切换开关 导通。
一种电源系统的启动方法， 包括：
A:软启动步骤，优先通过软启动电路控制输出由小逐渐上升至预设正常值； B: 正常启动步骤， 在步骤 A中输出达到预设正常值后， 切换到环路电路正 常控制输出；
所述步骤 A中， 在执行软启动步骤的同时， 对所述环路电路中的环路电容 进行预充电。
优选的， 所述软启动电路由一恒流源供电， 所述环路电容也由该恒流源供 电。 优选的， 所述环路电容由一预充电电路进行充电， 所述预充电电路的输入 端与所述恒流源耦合， 所述预充电电路的输出端与所述环路电容耦合。
优选的， 所述预充电电路设置有一预充电开关并通过该预充电开关耦合到 所述环路电容， 所述软启动电路同时驱动所述预充电开关在软启动电路控制电 源系统时使该预充电开关导通； 当软启动电路结束控制时， 软启动电路同时驱 动该预充电开关关闭。
优选的， 所述预充电开关为三极管。
本发明的电源系统由于在软启动步骤中， 在切换到环路电路控制之前预先 换到环路电路控制时， 环路电路不需要再对环路电容进行充电， 这样就避免需 要对环路电容充电而导致输出电压异常。
【附图说明】
图 1是本发明实施例电源系统的启动控制电路图，
图 2是本发明实施例电源系统的启动方法流程图。
其中： 10、 软启动电路、 20、 环路电路， 30、 预充电电路， 40、 恒流源, 50、 输出电路。
【具体实施方式】
下面结合附图和较佳的实施例对本发明作进一步说明。
本发明公开一种电源系统， 如图 1 所示， 所述电源系统包括： 电源输出电 路 50、 软启动电路 10、 为软启动电路 10供电的恒流源 40、 环路电路 20, 所述 的环路电路 20内设有环路电容 C3; 所述软启动电路 10的输入端与所述恒流源 40耦合， 其输出端与所述电源输出电路 50的输入端耦合， 所述环路电路 20的 输出端与所述电源输出电路 50的输入端耦合； 所述电源系统还包括一用于给所 述环路电容 C3充电的预充电电路 30, 所述预充电电路 30在电源系统切换到环 路电路 20供电 （即切换到环路电路控制电源系统的输出）之前为所述环路电容 C3充电。
电源系统在启动时优先由软启动电路 10进行控制， 恒流源 40通过软启动 开关 T1耦合到电源输出电路 50; 所述预充电电路 30通过所述预充电开关 T2 耦合到所述环路电容 C3; 所述环路电路 20通过切换开关 T3耦合到电源输出电 路 50; 所述软启动开关 T1和预充电开关 T2的控制逻辑相同， 并跟切换开关 T3 的控制逻辑相反。 软启动电路 10包括： 第一比较器 U3A, 第一比较器 U3A的 比较端耦合到第一基准电压 VREF2, 其基准端耦合到恒流源并通过软启动电容 C4耦合到电源系统的接地端； 其输出端分别耦合到软启动开关 Tl、预充电开关 Τ2以及切换开关 Τ3的控制端。
环路电路 20包括第二比较器 U4B, 所述第二比较器 U4B的基准端耦合有 第二基准电压 VREF1 ,其比较端耦合有负载反馈，输出端通过切换开关 Τ3耦合 到电源输出电路 50; 输出端和比较端之间串接有环路电容 C3。
当软启动电路控制电源系统的输出时， 软启动电容 C4未充满电， 其电压小 于第一基准电压 VREF2, 第一比较器 U3A输出一低电平驱动软启动开关 T1和 预充电开关 T2导通， 并驱动切换开关 T3关闭
当软启动电路 10控制的输出达到预设正常值后， 即软启动电路 10结束对 电源系统的输出控制，软启动电容 C4充满电，其电压高于第一基准电压 VREF2 , 第一比较器 U3A输出一高电平 （即图示 SSOK信号）驱动软启动开关 T1和预 充电开关 T2关闭， 并驱动切换开关 T3导通。 此时软启动电路 10停止对电源系 统的输出进行控制， 并切换至环路电路 20进行控制。
电源系统在由软启动电路 10控制输出的这段时间内， 由预充电电路 30对 环路电容 C3进行充电。 预充电电路 30的输入端与所述恒流源 40耦合， 其输出 端与所述环路电容 C3耦合。 此时， 当切换到环路电路 20进行控制时， 由于环 路电容 C3预先得到预充电电路 30的充电，避免在切换到环路电路 20控制后环 路电容 C3由恒流源 40充电使其达到软启动结束时的正常电压， 在软启动电路 10切换到环路电路 20的过程中，环路电路 20为电源输出电路 50供电时环路电 容 C3对环路电路 20供电过程影响较小甚至不会产生影响， 从而对输出电路 50 的影响也较小或不会对输出电路 50产生影响使输出电路 50达到稳定值正常工 作。
在本实施例中， 所述预充电开关 T2为三极管， 所述三极管为 PNP型开关 管； 所述三极管的控制端与所述软启动电路的第一比较器的输出端耦合。
在本实施例中， 预充电电路的输入端耦合到恒流源 40上， 即环路电容实质 上是由恒流源 40直接充电， 当然， 预充电电路的输入端也可以耦合到其它电源 上， 并不限于本实施例所提供的方式。
如图 2所示为电源系统的启动方法， 其包括：
A:软启动步骤，优先通过软启动电路控制输出由小逐渐上升至预设正常值； 在执行软启动步骤的同时， 对所述环路电路中的环路电容进行预充电。
B: 正常启动步骤， 在步骤 A中输出达到预设正常值后， 切换到环路电路正 常控制输出；
在软启动电路为输出电路供电时， 电源系统对环路电容进行预充电， 使其 具有一定的电压， 在软启动切换到环路的过程中， 环路电容的电压保持着与软 启动结束时的电压一致， 即达到正常值； 由于环路电容具有一定的电压， 当环 路电路为输出电路供电时不再为环路电容充电， 或当环路电路为输出电路供电 时环路电容不会对其产生影响或产生的影响较小， 从而就可使输出电路上的电 压达到稳定值而正常工作。
以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明， 不 能认定本发明的具体实施只局限于这些说明。 对于本发明所属技术领域的普通 技术人员来说， 在不脱离本发明构思的前提下， 还可以做出若干筒单推演或替 换， 都应当视为属于本发明的保护范围。

Claims

权利 要求
1、 一种电源系统， 包括：
电源输出电路；
与所述电源输出电路的输入端耦合的软启动电路；
为软启动电路供电的恒流源；
以及与所述电源输出电路耦合的环路电路；
所述的环路电路内设有环路电容；
用于给所述环路电容充电的预充电电路， 所述预充电电路在电源系统切换 到环路电路供电之前为所述环路电容充电；
所述预充电电路的输入端与所述恒流源耦合， 所述预充电电路的输出端与 所述环路电容耦合； 所述预充电电路设置有一预充电开关， 所述预充电开关在 电源系统切换到环路电路供电之前导通；
所述恒流源通过软启动开关耦合到电源输出电路； 所述预充电电路通过所 述预充电开关耦合到所述环路电容； 所述环路电路通过切换开关耦合到电源输 出电路； 所述软启动开关和预充电开关的控制逻辑相同， 并跟切换开关的控制 逻辑相反；
所述软启动电路包括第一比较器， 第一比较器的比较端耦合到第一基准电 压， 其基准端耦合到恒流源并通过软启动电容耦合到电源系统的接地端； 其输 出端分别耦合到软启动开关、 预充电开关以及切换开关的控制端；
所述环路电路包括第二比较器， 所述第二比较器的基准端耦合有第二基准 电压， 其比较端耦合有负载反馈， 输出端通过切换开关耦合到电源输出电路； 输出端和比较端之间串接有环路电容；
当软启动电容电压小于第一基准电压时， 第一比较器驱动软启动开关和预 充电开关导通， 并驱动切换开关关闭； 当软启动电容充满电， 其电压高于第一 基准电压时， 第一比较器驱动软启动开关和预充电开关关闭， 并驱动切换开关 导通。
2、 一种电源系统， 包括：
电源输出电路；
与所述电源输出电路的输入端耦合的软启动电路；
为软启动电路供电的恒流源；
以及与所述电源输出电路耦合的环路电路；
所述的环路电路内设有环路电容；
还包括一用于给所述环路电容充电的预充电电路， 所述预充电电路在电源 系统切换到环路电路供电之前为所述环路电容充电。
3、 如权利要求 2所述的电源系统， 其中， 所述预充电电路的输入端与所述 恒流源耦合， 所述预充电电路的输出端与所述环路电容耦合。
4、 如权利要求 3所述的电源系统， 其中， 所述预充电电路设置有一预充电 开关， 所述预充电开关在电源系统切换到环路电路供电之前导通。
5、 如权利要求 4所述的电源系统， 其中， 所述恒流源通过软启动开关耦合 到电源输出电路； 所述预充电电路通过所述预充电开关耦合到所述环路电容； 所述环路电路通过切换开关耦合到电源输出电路； 所述软启动开关和预充电开 关的控制逻辑相同， 并跟切换开关的控制逻辑相反。
6、如权利要求 5所述的电源系统， 其中， 所述软启动电路包括第一比较器， 第一比较器的比较端耦合到第一基准电压， 其基准端耦合到恒流源并通过软启 动电容耦合到电源系统的接地端； 其输出端分别耦合到软启动开关、 预充电开 关以及切换开关的控制端；
所述环路电路包括第二比较器， 所述第二比较器的基准端耦合有第二基准 电压， 其比较端耦合有负载反馈， 输出端通过切换开关耦合到电源输出电路； 输出端和比较端之间串接有环路电容；
当软启动电容电压小于第一基准电压时， 第一比较器驱动软启动开关和预 充电开关导通， 并驱动切换开关关闭； 当软启动电容充满电， 其电压高于第一 基准电压时， 第一比较器驱动软启动开关和预充电开关关闭， 并驱动切换开关 导通。
7、 一种电源系统的启动方法， 包括：
A:软启动步骤，优先通过软启动电路控制输出由小逐渐上升至预设正常值； B: 正常启动步骤， 在步骤 A中输出达到预设正常值后， 切换到环路电路正 常控制输出；
所述步骤 A中， 在执行软启动步骤的同时， 对所述环路电路中的环路电容 进行预充电。
8、 如权利要求 7所述的电源系统的启动方法， 其中， 所述软启动电路由一 恒流源供电， 所述环路电容也由该恒流源供电。
9、 如权利要求 8所述的电源系统的启动方法， 其中， 所述环路电容由一预 充电电路进行充电， 所述预充电电路的输入端与所述恒流源耦合， 所述预充电 电路的输出端与所述环路电容耦合。
10、 如权利要求 9所述的电源系统的启动方法， 其中， 所述预充电电路设 置有一预充电开关并通过该预充电开关耦合到所述环路电容， 所述软启动电路 同时驱动所述预充电开关在软启动电路控制电源系统时使该预充电开关导通； 当软启动电路结束控制时， 软启动电路驱动该预充电开关关闭。
11、 如权利要求 7 所述的电源系统的启动方法， 其中， 所述预充电开关为 三极管。
PCT/CN2012/083504 2012-09-24 2012-10-25 一种电源系统及其启动方法 Ceased WO2014043977A1 (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13/699,742 US9025349B2 (en) 2012-09-24 2012-10-25 Power system and starting method thereof with small changed or unchanged PWM output

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201210356678.4A CN102867495B (zh) 2012-09-24 2012-09-24 一种电源系统及其启动方法
CN201210356678.4 2012-09-24

Publications (1)

Publication Number Publication Date
WO2014043977A1 true WO2014043977A1 (zh) 2014-03-27

Family

ID=47446327

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2012/083504 Ceased WO2014043977A1 (zh) 2012-09-24 2012-10-25 一种电源系统及其启动方法

Country Status (2)

Country Link
CN (1) CN102867495B (zh)
WO (1) WO2014043977A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112909722A (zh) * 2021-02-19 2021-06-04 上海空间电源研究所 一种大功率脉冲激光电源电路
CN115756063A (zh) * 2022-11-30 2023-03-07 广东舜势测控设备有限公司 化成分容系统的软启动数控方法及控制器、存储介质

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103295538B (zh) * 2013-07-02 2015-03-04 深圳市华星光电技术有限公司 背光驱动电路及减少背光驱动电路软启动时间的方法
CN104617568B (zh) * 2015-02-02 2018-01-05 深圳市中科源电子有限公司 一种电子负载mos管防浪涌电路
CN107294366B (zh) * 2016-03-31 2022-05-06 法雷奥汽车内部控制（深圳）有限公司 预充电电路、直流-直流转换器和混合动力汽车
CN106505849A (zh) * 2016-12-24 2017-03-15 成都卓创科微电子有限公司 一种时间可控的线性软启动电路

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4806842A (en) * 1988-05-09 1989-02-21 National Semiconductor Corporation Soft start for five pin switching regulators
CN101340142A (zh) * 2008-08-15 2009-01-07 华为技术有限公司 一种电源软启动的方法、装置及系统
CN102447380A (zh) * 2010-10-12 2012-05-09 Ad技术有限公司 用于电源的软启动电路
CN102545572A (zh) * 2010-12-29 2012-07-04 华润矽威科技（上海）有限公司 一种采用电容复用的软启动电路及方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6998829B2 (en) * 2003-05-14 2006-02-14 Intersil Americas Inc. Soft start precharge circuit for DC power supply
JP2005051956A (ja) * 2003-07-31 2005-02-24 Rohm Co Ltd Ｄｃ／ｄｃコンバータ
JP4823604B2 (ja) * 2005-08-05 2011-11-24 ローム株式会社 ソフトスタート回路、電源装置、電気機器
FI20075854A0 (fi) * 2007-11-29 2007-11-29 Nokia Corp Ohjauspiiri ja ohjausmenetelmä

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4806842A (en) * 1988-05-09 1989-02-21 National Semiconductor Corporation Soft start for five pin switching regulators
CN101340142A (zh) * 2008-08-15 2009-01-07 华为技术有限公司 一种电源软启动的方法、装置及系统
CN102447380A (zh) * 2010-10-12 2012-05-09 Ad技术有限公司 用于电源的软启动电路
CN102545572A (zh) * 2010-12-29 2012-07-04 华润矽威科技（上海）有限公司 一种采用电容复用的软启动电路及方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112909722A (zh) * 2021-02-19 2021-06-04 上海空间电源研究所 一种大功率脉冲激光电源电路
CN115756063A (zh) * 2022-11-30 2023-03-07 广东舜势测控设备有限公司 化成分容系统的软启动数控方法及控制器、存储介质

Also Published As

Publication number Publication date
CN102867495B (zh) 2015-02-25
CN102867495A (zh) 2013-01-09

Similar Documents

Publication Publication Date Title
US9559542B2 (en) Battery powered circuit and method
US9906140B2 (en) Power supply circuit and power supply method for switching power supply
TWI439006B (zh) 雙模式充電器及其充電方法
CN104300630B (zh) 充电控制装置及方法
TWI440288B (zh) 具有加速啓動功能之啓動控制電路及其操作方法
WO2014043977A1 (zh) 一种电源系统及其启动方法
JP5589346B2 (ja) 充電回路及びその充電方法
US20150349519A1 (en) Overcurrent protection device and overcurrent protection method for electronic modules
US10218195B2 (en) Switching-type charging circuit capable of quickly dropping the voltage at the input end to zero
TWI685176B (zh) 具有自電池模式轉換至適配器模式時保護適配器元件之轉換控制的電池充電系統，控制器和方法
CN103875170B (zh) 电力转换器及其预充电电路
US8174304B2 (en) Key module having light-indicating functionality and a method for controlling the same
WO2015081630A1 (zh) 一种反激式快速启动驱动电路及驱动方法
JP5912514B2 (ja) 電子機器
JPWO2016001976A1 (ja) 電力変換装置
US8830706B2 (en) Soft-start circuit
JP2016226152A (ja) 電源制御装置
JP2007288979A (ja) 直流電源装置
CN113162187B (zh) 充电控制方法、充电机及存储介质
CN106655749B (zh) 一种电源控制电路及应用其的开关电源
TW201206004A (en) Methods and circuits for power switching
WO2017157113A1 (zh) Dc-dc调节器及其软启动的控制方法、控制器
CN105634109A (zh) 一种不间断电源的控制方法及装置
WO2015003459A1 (zh) 背光源驱动电路及显示装置
CN113937982A (zh) 自举电容充电的开关电源电路、方法、装置、设备与介质

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 13699742

Country of ref document: US

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12884785

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12884785

Country of ref document: EP

Kind code of ref document: A1