CN201181903Y - Input circuit of DC power supply - Google Patents

Input circuit of DC power supply Download PDF

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Publication number
CN201181903Y
CN201181903Y CNU2008200056543U CN200820005654U CN201181903Y CN 201181903 Y CN201181903 Y CN 201181903Y CN U2008200056543 U CNU2008200056543 U CN U2008200056543U CN 200820005654 U CN200820005654 U CN 200820005654U CN 201181903 Y CN201181903 Y CN 201181903Y
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China
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circuit
power supply
connected
dc power
reverse
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CNU2008200056543U
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Chinese (zh)
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孙克原
王洪来
飞 陈
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中兴通讯股份有限公司
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Abstract

The utility model provides an input circuit for a direct-current power supply, which comprises a reverse polarity prevention circuit and a delay startup circuit which are connected with each other and connected with a direct-current power supply and then a later stage of filter circuit and a secondary power supply. The input circuit for a direct-current power supply not only has a reverse polarity prevention function but also has a delay startup function.

Description

直流电源的输入电路 DC power input circuit

技术领域 FIELD

本实用新型涉及通4言4页:威,具体而言,涉及一种直流电源的输入电路。 The present invention relates to 4 made through 4: K, particularly, to a DC power input circuit.

背景技术 Background technique

目前电信平台普遍采用多个单板和背4反对插的结构,其电源分 Current telecommunications platform more widely used plug boards and structures against the back 4, the power points

配也普遍采用DPS (分布式)架构。 Also commonly used with DPS (distributed) architecture. 由于分布式电源的特点,单板需要从背板把48V母线电源(或者是其他电压等级的电源)接入到单板,经过滤波后给二次电源才莫块转换成12V、 5V、 3.3V、 2.5V等低电压供芯片使用。 Because the characteristics of the distributed power, the board needs to backplane bus 48V power (or other power supply voltage level) from access to the board, after filtering only to the secondary power supply is converted into blocks Mo 12V, 5V, 3.3V , 2.5V for chips and other low-voltage use. 在单板上电或者插拔的过程中,由于母线滤波电容或者二次电源模块电源输入侧滤波电容的存在会产生很大的电 In the process of the board or an electrical plug, since the presence of the secondary power supply bus filter capacitor or filter capacitor module power input side can produce a large electrical

流尖峰,大的启动电流往往会影响单板的正常工作,使主回路开关管过功率损坏或者使得保险丝容易损坏。 Peak flow, a large starting current tends to affect the normal operation of the board, the main circuit through the switch so that the power fuse or damage easily damaged. 另外,在现场维护和操作过程中,电源极性接反后会对单板元器件或者系统造成损坏。 In addition, during field maintenance and operations, after the reverse power polarity will cause damage to the board or the system components. 因此, 随着现在电信设备对于单板级和系统级的可靠性日益增加,对单板电源的要求也越来越高,要求单板电源具有防反接、输入緩启动、 改善EMC等功能,需要4是供一套单板电源输入防反接和緩启动的整体解决方案。 Therefore, with the telecom equipment now increasing reliability for the board-level and system-level, board power requirements have become more sophisticated, requiring board power supply with anti-reverse, input slow start, improved EMC and other functions, 4 is a need for a solution to the overall power input board anti-reverse gentle start.

防反接电路的实现比较简单,用二极管等带极性的电器元件即可实现,图1示出了一种常规的防反接电路。 Achieve anti-reverse circuit is relatively simple, can be realized by a diode element with electrical polarity, FIG. 1 illustrates a conventional anti-reverse circuit. 其中的E是单板上的后级滤波电路及二次电源。 Wherein E is a single-stage filter circuit board and a secondary power supply. 该防反接电路用于防止直流输入电源错误地反接。 The anti-reverse circuit for preventing a reverse DC input incorrectly.

现有技术对于直流输入电源的緩启动电路一般有两种方法。 For DC input prior art slow start circuit are generally two methods. 一种是采用专用的热插拔控制芯片。 One is using a dedicated hot-swap controller chip. 这种方法虽然可以控制主回路开关管可控开通和实现热插拔,但是在实现的过程中,需要设计一些 Although this method can control the main controllable switch opening circuit and hot swappable, but the realization of the process, it is necessary to design some

外围分立器件实现电源的慢充快放,这从设计上来讲增加了复杂性; 另外,在成本考虑方面,采用集成控制芯片也不是电信设备制造商的一个理想选择。 Peripheral power discrete devices slow charge fast discharge, which increases the complexity of the design in terms; In addition, cost considerations, the use of an integrated control chip is not ideal for a telecommunications equipment manufacturer.

另一种用分立元件实现输入緩启动的电^各如图2所示,通过在主回路MOSFET的G,S才及之间并联一个电容Cl,上电时,电源通过R3, Cl的组成的RC充电回路给C1充电,Cl电压按指数规律緩慢上升,从而实现MOSFET的緩慢开通。 Another use of discrete components of the electrical input ^ slow start, by G in the main circuit of the MOSFET, as shown in each of the 2 S was parallel between a capacitor Cl and, upon power supply by R3, of the composition Cl RC charging circuit charges C1, Cl exponentially voltage rises slowly, in order to achieve a slow turn MOSFET. 另外,现有4支术中对MOSFETG极和S极并联的电容做了一些改进,如在QS间并联多个电容,通过一个额外的开关电路控制开通过程中QS间的电容值, 使G,S间的电压4妄近线性上升。 Further, prior to surgery 4 MOSFETG electrode and a capacitor in parallel S pole made some improvements, such as a plurality of capacitors connected in parallel between the QS, QS controlling the capacitance value between the turn-up by an additional switching circuit, G, 4 near linear voltage jump between the S rises.

在实现本实用新型过程中,设计人发现现有技术对于单^反电源输入分开设计防反接和緩启动电路,缺乏把这两种电路整合在一起完成一个完整的电源输入解决方案。 In the implementation of the present invention, the design found in the prior art for single-supply input separate ^ anti design anti-reverse gentle start-up circuit, the lack of these two circuits together to complete a full power input solutions. 即,往往只有反^妄电^各,没有緩启动电路,或者只有緩启动电路,而没有防反接电路。 That is, often only anti-^ ^ each jump electricity, no soft-start circuitry, or only slow start circuit and no anti-reverse circuit. 这些电路只是分别单独实现了电源的防反4妄或者緩启动功能。 These circuits are separately realized only 4 Prevention jump supply or slow start function. 4旦是在实际应用时,当需要考虑两个功能同时实现时,原来单独设计的电路变得不适用了或者需要在原有电路上进行更改。 4 denier is applied in practice, need to be considered when two functions simultaneously to achieve the original design of the circuit becomes a single NA, or a need to make changes in the original circuit.

实用新型内容 SUMMARY

本实用新型旨在提供一种直流电源的输入电路,以解决直流电源的输入电路不能同时具有緩启动和防直流电源反接功能的问题。 The present invention aims to provide an input circuit for a DC power supply, to address input circuit having a DC power source can not be soft-start and anti-reverse function of the DC power source simultaneously.

在本实用新型的实施例中,提供了一种直流电源的输入电路, In an embodiment of the present invention, there is provided an input circuit for a DC power supply,

包括:相互连接的防反接电路和緩启动电路,其4妄入直流电源,并连4矣至后级滤波电路和二次电源。 Including: anti-reverse circuit interconnected gentle start-up circuit 4 jump into DC power, and to carry on even after the 4-stage filter circuit and the secondary power supply.

优选的,防反接电路是相对于直流电源正接的二极管VD2;緩启动电路具体包括:场效应管VT1、电容C1、稳压二极管VD1、 电阻R3、电阻R4、电阻R5;其中,场效应管VT1的冲册极连接电阻R5之后,与其源极一起并联至电容C1,并联至相对于直流电源反接的稳压二极管VD1,以及并联至电阻R4;以上构成的并联电路的栅极端与电阻R3串联,连4妄至直流电源的正才及和后级滤波电路和二次电源的第一端,并联电路的源极端连接至直流电源的负极; 场效应管VT1的漏纟及端连4妄至后级滤波电路和二次电源的第二端。 Preferably, the anti-reverse with respect to the DC power supply circuit is a diode connected n the VD2; soft-start circuit comprises: a field effect transistor VT1, capacitor C1, voltage regulator diode VD1, resistor R3, a resistor R4, a resistor R5; wherein FET after the red book VT1 connected resistors R5, together with its source connected in parallel to the capacitor C1, in parallel to the DC power supply with respect to reverse zener diode VD1, and the parallel to the resistor R4; the gate terminal of the parallel circuit of the resistor R3 of the above configuration series, and even 4 to jump to the positive DC power supply and the only post-stage filter circuit and a first terminal, a source terminal of the second parallel circuit connected to the DC power supply negative electrode; VT1 FET and a drain terminal connected Si jump 4 a second end to the rear-stage filter circuit and a secondary power supply.

优选的,防反接电路设置于直流电源的负极与并联电路的源极端之间。 Preferably, the source terminal of the anti-reverse DC power supply circuit is provided in a parallel circuit between the negative electrode.

优选的,防反接电路设置于场效应管VT1的漏极端与后级滤波电3各和二次电源的第二端之间。 Preferably, the anti-reverse circuit 3 is provided between the drain terminal and the second end of each succeeding stage of the filter circuit FET VT1 secondary power supply.

优选的,防反接电路设置于电阻R3与后级滤波电路和二次电源的第一端之间。 Preferably, the anti-reverse circuit is provided between the first terminal of the resistor R3 and the rear-stage filter circuit and a secondary power supply.

优选的,防反接电路设置于缓启动电路内部。 Preferably, the anti-reverse slow start circuit is provided in the internal circuit.

优选的,防反接电路设置于并联电路中的稳压二极管VD1的正才及与场效应管VT1的源极之间。 Preferably, the circuit is provided between the anti-reverse parallel circuit before positive zener diode VD1, and the source of the FET VT1.

优选的,输入电路还包括分压电路和快放回路;其中,分压电;咯包括串联的电阻R1和电阻R2,电阻R1连4妄至直流电源的正才及, 电阻R2连接至直流电源的负极;快放回路包括三极管VT2,三极管VT2的基极和集电极与电阻R2并联,其发射才及连接至并联电路的P2点,其集电极连接至并联电路的P3点。 Preferably, the input circuit further comprises a voltage dividing circuit and back into the fast path; wherein the voltage divider; slightly comprising serially connected resistors R1 and R2, the resistor R1 is connected to the DC power supply 4 jump and only positive, the resistor R2 is connected to the DC power supply a negative electrode; fast back passage and including a base and a collector transistor VT2 parallel resistor R2, transistor VT2, only the emission point P2 and is connected to the parallel circuit, its collector connected to the parallel circuit point P3.

因为本实用新型同时包括了反接电路和緩启动电路,所以克服了直流电源的,俞入电路不能同时具有緩启动和防直流电源反冲妄功能的问题,从而既有防反4妾功能,又有緩启动功能。 Since the present invention includes both the reverse circuit gentle start-up circuit, the DC power supply to overcome, Yu the circuit has a problem can not slow start and the anti-kickback jump function of the DC power source, so that both anti-anti concubine 4 function, and there are soft-start function.

附图说明 BRIEF DESCRIPTION

此处所说明的附图用来提供对本实用新型的进一步理解,构成本申请的一部分,本实用新型的示意性实施例及其说明用于解释本实用新型,并不构成对本实用新型的不当限定。 The drawings described herein used to provide further understanding of the present invention, constitute a part of this application, the present invention exemplary embodiments are used to explain the present invention and is not an unduly limit the present invention. 在附图中: In the drawings:

图1示出了一种常规的防反接电路的示意图; FIG 1 shows a schematic view of a conventional anti-reverse circuit;

图2示出了一种常失见的緩启动电^各的示意图; FIG 2 shows a schematic diagram of a normally lost respective common electrically ^ slow start;

图3是本实用新型直流电源的输入电路实施例1的示意图; FIG 3 is a schematic diagram of an input circuit according to the present embodiment of the invention, a DC power supply;

图4是本实用新型直流电源的输入电实施例2的电路图; FIG 4 is a circuit diagram of the input 2 of the present embodiment of the invention the DC power source;

图5是本实用新型直流电源的输入电路实施例3的电路图。 FIG 5 is a circuit diagram of embodiment 3 of the present invention, the DC power supply input circuit embodiment.

具体实施方式 Detailed ways

下面将参考附图并结合实施例,来详细i兌明本实用新型。 Below with reference to accompanying drawings and embodiments, clear detail against the present invention i.

实施例1 Example 1

如图3所示,本实用新型直流电源的输入电路包括:相互连接的防反4妾电5各102和纟爰启动电^各103,其4妾入直流电源101 ,并连才妾至后纟及滤波电^各和二次电源104。 As shown, the present invention includes a DC power supply input circuit 3: 4 Counter concubine each electrically connected to each of the 5 Yuan 102 and the Si starting each electrically ^ 103 101 4 concubine into DC power, and it is connected to the rear concubine ^ Si and each filter circuit 104 and the secondary power supply.

因为本实施例同时包括了反接电路和緩启动电路,所以克服了直流电源的输入电路不能同时具有緩启动和防直流电源反接功能的问题。 Since the present embodiment includes both the problem of reverse circuit gentle start-up circuit, it overcomes the input circuit having a DC power supply can not soft start the DC power supply and the anti-reverse function.

值得注意的是,本说明书中的"连接"并不限于直接连接,还 It is noted that, in this specification, "connection" is not limited to direct connection, but also

可以是跨过其它元件连接。 It may be connected across the other elements. 例如,图中的缓启动电路103连4妄至后级滤波电路和二次电源104,可以是跨过其他的器件例如二才及管连接至后级滤波电路和二次电源104,或者是直接连接至后级滤波电路和二次电源104。 For example, the soft-start circuit 103 in FIG. 4 is connected to the jump-stage filter circuit and the secondary power supply 104 may be, for example, across the other two devices before and after the pipe is connected to the second-stage filter circuit and a power supply 104, either directly connected to the rear stage filter circuit and the secondary power source 104.

图3的实施例中,防反接电路102是緩启动电路103的前级, 但应该明白,本发明并不限定于此,防反接电路102还可以是缓启动电路103的后级,或者设置于IC启动电路103内部,下面将更详 3 embodiment, the anti-reverse circuit 102 is a slow-start circuit 103 of the preceding stage, it should be understood that the invention is not limited thereto, the anti-reverse circuit 102 may also be soft-start circuit 103 of the subsequent stage, or starting circuit is provided inside the IC 103, will be detailed below

细地对此予以说明。 Fine to give this explanation.

实施例2 Example 2

图4为本实用新型的实施例2,本实用#斤型直流电源的输入电路包括:相互连接的防反接电路D和緩启动电路C,其接入直流电源,并连^妾至后级滤波电路和二次电源E。 FIG 4 is an embodiment 2 of the invention, the present invention input circuit # pounds DC power supply comprising: D anti-reverse circuit interconnected gentle start circuit C, which access the DC power supply and connected to the rear stage filter ^ concubine and the secondary power supply circuit E.

防反接电路D是相对于直流电源正接的二极管VD2;緩启动电3各C具体包括: D is a anti-reverse circuit for the direct current power supply is connected to the VD2 of the diodes; slow start each electrically 3 C comprises:

场效应管VT1、电容Cl、稳、压二才及管VD1、电阻R3、电阻R4、电阻R5;其中, FET VT1, capacitors Cl, stable, and only two pressure pipes VD1, resistor R3, a resistor R4, a resistor R5; wherein,

场效应管VT1的栅极连接电阻R5之后,与其源才及一起并联至电容Cl,并联至相对于直流电源反接的稳压二极管VD1,以及并耳关至电阻R4; After the resistor R5 connected to the gate of FET VT1, and its source connected in parallel with it to the capacitor Cl, connected in parallel with respect to the DC power supply reverse zener diode VD1, and off to the resistor R4 and the ear;

以上构成的并联电路的P2点与电阻R3串联,连接至直流电源的正极和后级滤波电路和二次电源的第一端,并联电路的源极端连接至直流电源的负极; Above the point P2 parallel circuit composed of the resistor R3 in series, the DC power source is connected to the positive electrode and the rear-stage filter circuit and a first terminal, a source terminal of the parallel circuit is connected to the negative electrode of the secondary power supply is a DC power source;

场效应管VT1的漏纟及端连4妄至后级滤波电路和二次电源的第二端。 VT1 Si FET drain terminal and a second terminal connected to the jump to 4-stage filter circuit and a secondary power supply.

本实施例中的二极管VD2能够实现防止直流电源反接的功能。 Diode VD2 in the present embodiment can realize the function of preventing reverse DC power supply. 緩启动电路C通过在场效应管VT1的栅源之间并联一个电容C1, 上电时,电源通过R3、 Cl组成的RC充电回^各纟合C1充电,Cl电压按指数规律緩慢上升,从而实现场效应管VT1的緩慢开通。 C by the slow-start circuit connected in parallel between the gate and source of the transistor VT1 to a capacitor C1, when the power-supply through R3, Cl composed of RC charging back ^ C1 is charged each bonded Si, Cl exponentially voltage rises slowly, in order to achieve FET VT1 slowly opened.

因为本实施例同时包括了防反接电路和緩启动电路,所以克服了直流电源的输入电路各不能同时具有緩启动和防直流电源反接功能的问题。 Since the present embodiment includes both the problem of the anti-reverse circuit gentle start-up circuit, the DC power supply input circuit overcomes each not simultaneously having a soft start function and to reverse the anti-DC power supply.

实施例3 Example 3

如图5所示,本实用新型直流电源的输入电路包括:相互连接的防反接电路D和緩启动电路C,其接入直流电源,并连接至后级滤波电路和二次电源E,同时还包括分压电i?各A和快》文回路B;其中, 5, the present invention includes a DC power supply input circuit: D anti-reverse circuit interconnected gentle start circuit C, which access a DC power supply, and is connected to a rear-stage filter circuit and the secondary power source E, and also A voltage divider comprising for each i and fast "loop B text;? wherein

分压电路包括串联的电阻R1和电阻R2,电阻R1连接至直流电源的正才及,电阻R2连接至直流电源的负极; Comprises a series circuit of voltage dividing resistors R1 and R2, the resistor R1 is connected to the positive DC power source and only resistor R2 is connected to the negative DC power source;

快放回路包括三极管VT2,三极管VT2的基极和集电极与电阻R2并联,其发射极连接至并联电路的P2点,其集电极连接至并联电路的P3点。 Back into the fast path and comprises a base and a collector resistor R2 in parallel with transistor VT2, VT2 of the transistor, its emitter connected to the point P2 parallel circuit, its collector connected to the point P3 parallel circuit.

防反4妄电路D是相对于直流电源正4妾的二才及管VD2;緩启动电路C具体包括: Counter 4 jump circuit D is positive with respect to the DC power supply 4 and only two tube Concubines the VD2; C soft-start circuit comprises:

场效应管VT1、电容Cl、稳、压二才及管VD1、电阻R3、电阻R4、电阻R5;其中, FET VT1, capacitors Cl, stable, and only two pressure pipes VD1, resistor R3, a resistor R4, a resistor R5; wherein,

场效应管VT1的斥册极连接电阻R5之后,与其源才及一起并4关至电容Cl,并联至相对于直流电源反接的稳压二极管VD1,以及并耳关至电阻R4; FET VT1 repellent register connected after the resistor R5, and its only source 4 and off together to the capacitor Cl, connected in parallel with respect to the DC power supply reverse zener diode VD1, and off to the resistor R4 and the ear;

以上构成的并联电路的P2点与电阻R3串联,连接至直流电源的正才及和后级滤波电路和二次电源的第一端,并联电路的源才及端连4妾至直流电源的负才及; Above the point P2 parallel circuit composed of the resistor R3 in series, is connected to the positive DC power supply and the first end only, source and back-stage filter circuit and the secondary power supply and the parallel circuit was connected to the negative DC power supply 4 side concubine and only;

场效应管VT1的漏极端连接至后级滤波电路和二次电源的第 VT1 FET drain terminal connected to the second-stage filter circuit and a secondary power supply

防反接电路可以i殳置于电阻R3与后级滤波电路和二次电源的第一端之间,即设置于图中的粗线路径PATH1或者PATH3上。 I between the anti-reverse circuit may be placed Shu resistor R3 and the rear stage filter circuit and a first terminal of the secondary power source, i.e., disposed on the thick lines in FIG path PATH1 or PATH3.

防反接电路也可以设置于緩启动电路内部,例如防反接电路设置于并联电路中的稳压二极管VD1的正极与场效应管VT1的源极之间,即设置于图中的粗线路径PATH2上。 Anti-reverse circuit may be provided to an internal soft-start circuitry, for example, between the positive electrode and the source electrode of the FET VT1 anti-reverse circuit is provided in parallel circuit of zener diode VD1, i.e. disposed in the path of the thick line in FIG. PATH2 on.

防反4妄二才及管VD2 i殳置于图示的4且线路径PATH1 、 PATH2或者PATH3上,这样能阻断后级滤波电容对C的反灌。 4 only two anti-anti-jump and tube placed at 4 and VD2 i Shu illustrated line path PATH1, PATH2 on or PATH3, this will block the subsequent stage of the filter capacitor C is anti-irrigation.

本实用新型的一个实施例的电糾巴D部分放在PATH 1 (即主开关MOSFET和后级滤波电容之间)。 The present invention an electrical embodiment of the correction D bar portion is placed (i.e., between the main switching MOSFET and the rear stage filter capacitor) PATH 1. 在快速插拔的应用条件下还可以设置B作为MOSFET栅源级间电容Cl的快放回路。 Under conditions of rapid plug it may also be provided between the path B as quickly back MOSFET gate-source capacitance of Cl level.

FUI为输入电源熔断器。 FUI input power fuses.

图5调整了图4中防反接二极管VD2的位置,使VD2即可用于防反接,又可用于防止后级滤波电容电压反灌,并且增加了Rl, R2组成的分压网络和VT1组成的快;改回路。 FIG 5 is adjusted position, the anti-reverse diode VD2 Figure 4, can be used for making anti-reverse VD2, but also for preventing post filter capacitor voltage backfeed, and increased Rl, and a voltage divider network consisting of a composition VT1 R2 fast; change the loop.

下面结合图5说明本实用新型电路的工作过程。 Described below in connection with FIG. 5 during operation of the circuit of the present invention.

电路首次上电时,VIN+电源通过R3和Cl组成的RC充电电路给C1充电,Cl为并联在主回路MOSFET ( VT1 )冲册源级间的緩启动电容,Cl两端电压按指数规律上升,在达到VT1的开启电压VTH 之前,VT1等效为一个可变电阻,利用这一特性实现VT1的緩慢开通。 The circuit is first powered up, VIN + RC charging circuit power source through R3 and Cl consisting of charges C1, Cl start capacitor is connected in parallel with the main circuit MOSFET (VT1) buffer between the red book source level, Cl voltage across rises exponentially, before reaching the threshold voltage VTH of VT1, VT1 is equivalent to a variable resistor, to use this feature to achieve a slow opening of the VT1. 电阻R3和电容Cl的值经过优选后可以保证VT1在开通过程中工作在SOA区,避免过功率损坏。 Value of the resistor R3 and the capacitor Cl may preferably be guaranteed after the SOA region VT1 work in the opening process, to avoid excessive power damage. VD1为接在VT1栅源级之间的稳压二极管,稳压电压略高于VTH,为VT1栅源驱动电压提供过压保护。 VD1 is connected between the gate and the source level VT1 zener diode, slightly higher than the regulated voltage VTH of, provides overvoltage protection for the gate-source drive voltage VT1.

上电时,快放回路VT2不会导通,这是由分压网络决定的。 On power, fast VT2 path may not be turned back, which is determined by the voltage divider network. 接在VIN+和VIN-电源间的分压电阻Rl和R2经过分压后,Pl点和PNP三极管VT2的基极b相连,緩启动电i?各部分的电阻R3和R4 经过分压后的P2点和VT2的发射极e相连。 Connected between VIN + and VIN- power divider resistors Rl and R2 after dividing, Pl is the point and a PNP transistor VT2 base b is connected, soft start power I? Resistors R3 and R4 each part after the partial pressure P2 emission point e connected to the source and VT2. 合理设置R1〜R4的阻值,只要P1点电压高于P2点电压,就可保证上电时VT2不导通。 R1~R4 reasonable set of resistance, as long as the voltage at point P1 is higher than the voltage at point P2, the power can guarantee VT2 nonconductive. 上电时电源VIN+就会经过R3和Cl的充电回路实现缓启动。 Power will be through R3 VIN + and Cl charging circuit to achieve soft-start on power.

当热插拔时,单^反会出现多次的快速断电和上电过程。 When the hot-swappable, single-^ anti rapidly during power outages and appear more than once. 瞬间断电时,MOSFET(VTl)栅源级间的电容Cl上仍然有电压,而电源VIN+已断电,此时,P2点的电压高于Pl点电压,PNP三极管VT2 的e极b极之间承受正向电压而导通,Cl上的电压通过VT2得到快速泄放,为下一次上电緩启动做好准备。 When the momentary power failure, MOSFET (VTl) on the gate-source capacitor Cl remains level voltage, VIN + and the power is off, at this time, the voltage of the point P2 is higher than the voltage at point Pl, the PNP transistor VT2 e pole extremely b inter forward withstand voltage is turned on, the voltage on Cl rapid discharge by VT2, for the next power-up slow start to prepare. 防反接二极管VD2接在VT1和后级的电源滤波电容C2和C3之间,VD2的阴极和VT1的D极相连,阳极和滤波电容C2, C3的阴极相连,这样,当瞬间断电时, -使阻断了后级滤波电容C2, C3上的电压通过R3,C1,和VT1 体内寄生二极管的回路放电,加快了Cl的放电速度。 VD2 anti-reverse diode connected between VT1 and rear stage power supply filter capacitor C2 and a C3, VD2 VT1 and the cathode electrode D connected to the anode and the filter capacitor C2, C3 is connected to the cathode, so that, when the instantaneous power, - blocking the subsequent stage so that the filter capacitor C2, the voltage on C3 through R3, C1, and the parasitic body diode circuit VT1 discharge, accelerate the discharge rate of Cl.

本实用新型根据单板在实际应用中对电源输入的高可靠性要求。 The board according to the present invention in practical applications of high reliability power input. 用简单器件实现了单板直流电源输入防反接和緩启动的整体解决方案。 A simple device solution to achieve the overall anti-reverse DC power input board gentle start. 具有以下优点: It has the following advantages:

1,从实际单板电源需求出发,既有防反接功能,又有緩启动功能; 1, from the actual board power needs, both anti-reverse function, another slow start function;

2,把电路防反接的二极管移到主回路开关管MOSFET和后级滤波电容之间,既起到了电路防反接功能,又阻断了后级滤波电容电压反灌; 2, the anti-reverse diode circuit to move between the main circuit switch MOSFET and the rear stage filter capacitor, the circuit functions as both anti-reverse function, and after the blocking capacitor voltage backfeed level filtering;

3,设置了主回路MOSFET栅源电容电压快放电路,"使单板瞬间断电时4册源电容电压可以快速泄放,MOSFET可以快速截至,有效的减少单板热插拔时的沖击电流; 3, the main circuit provided with the gate-source capacitance of MOSFET circuit voltage fast forward, "so that the capacitor voltage source 4 instantaneous power board bleeding quickly, quickly ended MOSFET, effectively reduce the impact when the boards are hot swappable current;

4,电路简单可靠,性价比高,用较少的器件实现一种电源输入整体解决方案,可以估文成才莫块电^各统一调用。 4, the circuit is simple and reliable, cost-effective, implemented with less power input device which total solution, Mo taught text block can be estimated for each electrically ^ uniform call.

以上4又为本实用新型的优选实施例而已,并不用于限制本实用新型,对于本领域的技术人员来说,本实用新型可以有各种更改和变化。 4 of the present embodiment and the above embodiment it is preferred new practical, not intended to limit the present invention, those skilled in the art, the present invention may have various changes and variations. 凡在本实用新型的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本实用新型的保护范围之内。 Any modification within the spirit and principle of the invention, the, equivalent substitutions, improvements should be included within the scope of protection of the present invention.

Claims (8)

1.一种直流电源的输入电路,其特征在于,包括:相互连接的防反接电路和缓启动电路,其接入直流电源,并连接至后级滤波电路和二次电源。 An input circuit for a DC power supply, characterized by comprising: anti-reverse circuit interconnected gentle start-up circuit, the DC power supply which access, and connected to the rear stage filter circuit and the secondary power supply.
2. 根据权利要求1所述的输入电路,其特征在于,所述防反接电路是相对于所述直流电源正接的二级管VD2;所述缓启动电路具体包括:场效应管VT1、电容Cl、稳、压二才及管VD1、电阻R3、电阻R4、电阻R5;其中,场效应管VT1的栅极连接电阻R5之后,与其源极一起并联至电容Cl,并联至相对于所述直流电源反接的稳压二极管VD1,以及并耳关至电阻R4;以上构成的并联电路的P2点与电阻R3串联,连接至所述直流电源的正极和所述后级滤波电路路和二次电源的第一端,所述并联电路的源极端连接至所述直流电源的负极;场效应管VT1的漏一及端连接至所述后级滤波电路二次电源的第二端。 2. The input circuit according to claim 1, wherein said anti-reverse circuit is positive with respect to the DC power supply contact the VD2 diode; the soft-start circuit comprises: a field effect transistor VT1, capacitor cl, stable, and only two pressure pipes VD1, resistor R3, a resistor R4, a resistor R5; wherein, after the field effect resistor R5 connected to the gate of VT1 pipe, connected in parallel with its source electrode to the capacitor cl, connected in parallel with respect to direct current to the reverse power zener diode VD1, and ears close to the resistor and R4; P2 point over the parallel circuit composed of the resistor R3 in series, connected to the positive electrode of the DC power source and the second-stage filter circuit and the secondary power supply path a source terminal of a first end of said parallel circuit connected to the negative electrode of the DC power supply; and a drain terminal of FET VT1 is connected to the rear end of the second stage filter circuit of the secondary power supply.
3. 根据权利要求2所述的输入电路,其特征在于,所述防反接电路设置于所述直流电源的负极与所述并联电路的P3点之间。 3. The input circuit according to claim 2, wherein the anti-reverse connection point P3 between the DC power supply circuit is provided to the negative electrode of the parallel circuit.
4. 根据权利要求2所述的输入电路,其特征在于,所述防反接电路设置于场岁文应管VT1的漏一及端与所述后级滤波电路和二次电源的第二端之间。 4. The input circuit according to claim 2, wherein said drain terminal of the second anti-reverse circuit is provided to the field of the age of a packet to be VT1 and tube end and the rear-stage filter circuit and a secondary power supply between.
5. 根据权利要求2所述的输入电路,其特征在于,所述防反接电3各设置于电阻R3与所述后级滤波电路和二次电源的第一端之间。 The input circuit according to claim 2, wherein the anti-reverse electrically between a first end 3 provided in each of the resistor R3 and the rear-stage filter circuit and a secondary power supply.
6. 根据权利要求2所述的输入电路,其特征在于,所述防反接电^4殳置于所述緩启动电^^内部。 6. The input circuit according to claim 2, wherein said anti-reverse electrical Shu ^ 4 disposed inside the electrically ^^ slow start.
7. 根据权利要求6所述的输入电路,其特征在于,所述防反接电路设置于所述并联电路中的稳压二极管VD1的正极与场效应管VT1的源才及之间。 7. The input circuit according to claim 6, characterized in that the circuit is provided to reverse the positive and source of the transistor VT1 Zener diode VD1 the parallel circuit between it and the prevention.
8. 根据权利要求2至7任一项所述的输入电路,其特征在于,还包括:分压电路和快放回路;其中,所述分压电路包括串联的电阻R1和电阻R2,电阻R1连*接至所述直流电源的正才及,电阻R2连接至所述直流电源的负极;所述快放回路包括三极管VT2,所述三极管VT2的基极和集电极与电阻R2并联,其发射极连接至所述并联电路的P2 点,其集电才及连接至所述并联电路的P3点。 The input circuit according to claim 2-1 according to any one of claims 7, characterized in that, further comprising: a voltage dividing circuit and back into the fast path; wherein said circuit comprises a series of voltage dividing resistors R1 and R2, a resistor R1 * connected to said DC power supply and only the positive, negative resistor R2 is connected to the DC power supply; fast back into the path of the base and collector comprises a parallel resistor R2 and transistor VT2, VT2 of the transistor, which emits P2 is connected to the parallel circuit point, and its collector connected to only the parallel circuit of the point P3.
CNU2008200056543U 2008-04-01 2008-04-01 Input circuit of DC power supply CN201181903Y (en)

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CN104134971A (en) * 2013-05-03 2014-11-05 海洋王(东莞)照明科技有限公司 Battery polarity reverse alarm circuit and electronic equipment
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