CN1158746C - Control method of zero current on or off for power switch and its circuit - Google Patents

Control method of zero current on or off for power switch and its circuit Download PDF

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CN1158746C
CN1158746C CNB011226463A CN01122646A CN1158746C CN 1158746 C CN1158746 C CN 1158746C CN B011226463 A CNB011226463 A CN B011226463A CN 01122646 A CN01122646 A CN 01122646A CN 1158746 C CN1158746 C CN 1158746C
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circuit
switch
transformer
load
soft
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CN1393985A (en
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周代文
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艾默生网络能源有限公司
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion
    • Y02B70/14Reduction of losses in power supplies
    • Y02B70/1491Other technologies for reduction of losses, e.g. non-dissipative snubbers, diode reverse recovery losses minimisation, zero voltage switching [ZVS], zero current switching [ZCS] or soft switching converters

Abstract

一种实现功率开关的零电流开通和关断的控制方法及其电路,包括:在变压器的原侧边设置若干主功率开关,在副侧边设置软开关控制单元,在所述主功率开关开通后一预定时间开通所述软开关控制单元;而在该主功率开关关断前一预定时刻,关断所述软开关控制单元以阻断所述负载与所述变压器副侧边的连接。 Realizing zero-current switching power on and off control method and circuit, comprising: a plurality of primary side of a transformer of the main power switch, the soft switch control unit disposed in the secondary side, the opening of the main power switch after a predetermined time of the opening of the soft-switching control unit; and a predetermined time before the main power switch is turned off, blocking off the load connected to the side of the sub transformer soft switching off the control unit. 本发明电路设置有主开关单元,包含若干主功率开关;软开关电路单元,与负载串联。 The present invention is provided with a main circuit switching unit, comprising a plurality of main power switch; soft switching circuit means, connected in series with the load. 通过在负载与输出端之间加入辅助功率开关管,实现软开关结构简单,并实现零电压开关。 Between the load through the output terminal addition of the auxiliary power switch, soft switching simple structure, and to achieve zero voltage switching.

Description

一种实现功率开关的零电流开通和关断的控制方法及其电路 One implementation of the zero-current switching power on and off control method and its circuit

本发明涉及一种适用于正激式电路拓扑的实现功率开关零电流开通和关断的控制方法及其电路,特别是涉及一种利用将负载端切除的方法实现功率元件的软开关的方法。 The present invention relates to a suitable forward circuit topology of the power switch to achieve zero-current control method and circuit and a turn off, particularly to a method of using the soft switching load end of the power element to achieve ablation method.

在开关电源中,功率管如果工作在硬开通硬关断状态,开关过程中的损耗非常大,对电源的效率有很大的影响;同时硬开关的电压和电流在开关过程中剧烈变化会产生很大的电磁干扰EMI。 In the switching power supply, if the power management work hard turn hard off state, switching losses in the process is very large, has a great influence on the efficiency of the power supply; hard switching voltage and current while dramatic changes occur in the switching process a lot of electromagnetic interference EMI. 另一方面,为了减小电源的体积和重量,高频化是一种趋势;然而,电源工作频率的提高,极大地增加了开关损耗,这样会对电源的散热要求更高。 On the other hand, in order to reduce the volume and weight of power, a high-frequency trend; However, increasing the power supply frequency, the switching loss increases significantly, this will require higher power dissipation. 因此,经过长期实践,人们提出了软开关技术,即在零电流或零电压的状态下将功率开关开通或关断,目的就是为了提高电源的效率以及提高电源的功率密度。 Thus, after a long practice, have been proposed soft-switching technology, i.e. at zero current or zero voltage state of the power switch turn on or off, the purpose is to improve the efficiency and increase the power density of the power supply.

目前的软开关技术较多,主要有两大类。 The current soft-switching technology more, there are two main categories. 一种是通过外加电感、电容、二极管等通过谐振实现零电压或零电流开通、关断;另一种是通过并联一只辅助开关管,同时加上必要的谐振电容、谐振电感来实现软开关技术。 One is achieved by applying a zero voltage across the resonant inductor, capacitor, diode or zero current turn, off; the other is an auxiliary switch in parallel, the resonant capacitor simultaneously with the necessary, to achieve soft-switching resonant inductor technology. 中国专利号96120581.4公开了一种实现软开关脉宽调制的方法。 Chinese Patent No. 96120581.4 discloses a method for implementing soft switching pulse width modulation. 它是双管正激电路、谐振电路和连接上述两电路的二极管和控制电路组成的双管正激软开关逆变电路完成的,请参照图1A所示的实现该方法的电路图。 It is a two-transistor forward circuit, two-transistor forward soft-switching inverter circuit and a resonant circuit connecting the two diodes and the control circuit of the circuit is completed, referring to FIG. 1A to realize a circuit diagram of the method shown in FIG. 其中,双管正激电路由主开关S1、S2、直流电源Ec、负载等效电感Lr和负载等效电阻R组成;谐振电路由电容C1、C2、电感L、辅助开关S3、二极管D3串联组成;在双管正激电路中还接有箝位二极管D5和D6。 Wherein, two-transistor forward circuit from the main switch S1, S2, Ec of the DC power source, a load and a load equivalent inductance Lr composed of the equivalent resistance R; resonant circuit formed by capacitors C1, C2, the inductor L, the auxiliary switches S3, diode D3 in series ; in two-transistor forward circuit is also connected with clamp diodes D5 and D6. 显而易见,这种现有技术的电路中,是通过辅助开关S3产生谐振,并利用谐振电路使主开关S1和S2上的电流实现自然过零,请参阅图1B所示的各个元件之间的工作波形图,主开关S1和S2分别是在T1时刻开通并在T2时刻关断。 Obviously, this prior art circuit, auxiliary switch S3 is generated by the resonance, and the resonance circuit using the main switch S1 and S2 to achieve the natural current zero crossing, see the work between the various elements shown in FIG. 1B waveform diagram, the main switch S1 and S2 are opened at time T1 and time T2 is turned off. 然而采用这种现有技术的方法是由于增加谐振电路来实现的,相应地便增加了元器件,而谐振电感Lr和谐振电容C1及C2的体积均较大,因此较难满足提供提高功率密度的要求。 However, with this prior art approach due to the increase of the resonant circuit is achieved, corresponding components will be increased, while the volume of the resonant inductor Lr and a resonant capacitor C1 and C2 are larger, and therefore more difficult to meet provide increased power density requirements.

中国专利98113189.1公开了另一种现有技术的实现软开关的技术,它包括一个主开关103,一个辅助开关106,一个与主开关103并联的续流二极管100,一个与主开关103并联连接的谐振电容104,一个电流源109,一个谐振电感105,一个主二极管107,一个馈能装置108和一个电压源101组成,如图2所示。 Chinese Patent No. 98113189.1 discloses a soft switching technology Another prior art, comprising a main switch 103, auxiliary switch 106, a connector 100, a main switch 103 connected in parallel with the main switch freewheeling diode 103 is connected in parallel resonant capacitor 104, a current source 109, a resonant inductor 105, a main diode 107, 108 and a feeding means can be a voltage source 101, as shown in Fig. 该主开关103与辅助开关106都是周期地断开和接通,并且这种现有技术的电路需要在辅助开关106断开的同时接通主开关103,在所述主开关103断开后一段时间又接通辅开关106。 After disconnecting the main switch 103 and auxiliary switch 106 is turned on and periodically, and this prior art circuit requires auxiliary switch 106 while a main switch 103 is turned off, the main switch 103 is turned off period of time and auxiliary switch 106 is turned on. 由于电感105连接在电流源109与主二极管107同主开关103的连接点之间,如B点,所以辅二极管108在辅助开关断开时馈送谐振电感105的剩余能量,并同时馈送电流源109的能量。 Since the connection between the current source 109 and diode 107 is connected with the main point of the main switch 103, inductor 105 as point B, so the auxiliary diode 108 feeds the auxiliary switch is turned off when the residual energy of the resonant inductor 105 and current source 109 while the feeding energy of. 由此可见,这一电路仍然需要增加一个谐振电感元件,而且辅助开关106并非是零电流关断。 Thus, the resonant circuit is still a need to increase the inductance element, and the auxiliary switch 106 is not zero current shutdown.

毫无疑问地,这些现有技术的实现软开关的方法无疑都是通过增加一个谐振电路实现的,其缺陷是器件增加较多。 Undoubtedly, the method to achieve soft-switching of these prior art undoubtedly achieved by adding a resonant circuit, which device is increased more defects. 这样不但增加了成本,减低可靠性,而且控制部分也相当复杂。 This will not only increase the costs and reduce reliability, and control section is quite complicated.

本发明的一个目的在于提出一种实现功率开关的零电流开通和关断的控制方法,该方法通过控制设置在一变压器的副边侧的软开关的导通时序,实现了功率开关的零电流的开通与关断。 An object of the present invention is to propose a control method of zero-current turn-on and turn-off of the power switch an implementation of the method provided by controlling the activation timing of the soft switch of the secondary side of a transformer, at zero current in the power switch the closed and opened.

本发明的又一个目的在于提供一种实现功率开关零电流开通和关断的控制的电路,通过与负载相串连的功率开关,实现将负载切除。 Still another object of the present invention is to provide a zero-current switching power on and off of the control circuit implementation, in series with the load through the power switch, to achieve the removal of the load.

本发明的再一个目的在于提出一种实现功率开关的零电流开通和关断的控制方法,该方法通过将在一变压器的原边侧的全桥电路的两个桥臂上分别设置软开关的导通时序,实现了功率开关的零电流的开通与关断。 A further object of the present invention is to propose a control method of zero-current turn-on and turn-off of the power switch an implementation of the method provided by each of the two soft switching bridge arm of the full bridge circuit the primary side of a transformer conducting timing to achieve a zero current turn on and off the power switch.

本发明的再一个目的在于提供一种实现功率开关零电流开通和关断的控制的电路,通过将软开关设置在变压器的原边同样可以实现将负载切除。 A further object of the present invention is to provide a zero-current switching power on and off of the control circuit implementation, is provided by soft switching primary winding of the transformer can achieve the same removal of the load.

本发明通过如下技术方案实现:一种实现功率开关的零电流开通和关断的控制方法,包括a)在一变压器的原边侧设置若干主功率开关;b)在一变压器的副边侧设置一软开关控制单元,与负载相接;c)在所述主功率开关开通后一预定时刻开通所述软开关控制单元,用于在所述主功率开关开通过程中阻断所述负载与所述变压器副边侧的连接;d)在所述主功率开关关断前一预定时刻,关断所述软开关控制单元,用于在所述主功率开关关断过程中阻断所述负载与所述变压器副边侧的连接。 The present invention is achieved by the following technical solutions: A method of controlling the zero-current turn-on and off the power switch implemented, comprising a) provided on the primary side of a transformer plurality of main power switch; b) provided on the secondary side of a transformer a soft-switching control unit, and a load phase; c) opening of said soft switch control unit at a predetermined timing after the main power switch is on, the load for interrupting the main power switch turns on in the process connecting the secondary side of said transformer; D) at a predetermined time before the main power switch is turned off, turning off the soft switch control unit, for blocking the main power switch is turned off during the load the secondary side of the transformer is connected.

所述的方法,其中还包括e)在所述负载与所述软开关控制单元之间设置一滤波单元;f)在所述变压器副边侧设置一续流元件,与所述滤波单元构成回路,用于在所述软开关控制单元关断后,所述滤波单元的续流。 Said method further comprising e) a filter means disposed between said load and said soft switch control unit; F) provided with a freewheeling element on the secondary side of the transformer, and the loop filtering unit configured , turns off for the soft-switching control unit, the filter unit freewheeling.

所述的方法,其中还包括g)将所述主功率开关组成桥式电路;h)在所述变压器副边侧的正半周工作电路中设置第一软开关控制元件,用于所述桥式电路的工作在正半周的功率开关开通后的一预定时刻之前以及关断前一预定时刻切除所述负载与所述变压器副边侧的连接和用于正半周输出整流;i)在所述变压器副边侧的负半周工作电路中设置第二软开关控制元件,用于所述桥式电路的工作在负半周的功率开关开通后的一预定时刻之前以及关断前一预定时刻切除所述负载与所述变压器副边侧的连接和用于负半周输出整流。 Said method further comprising g) the main power switch form a bridge circuit; H) disposed at the positive half cycle of operation of the circuit of the secondary side of the transformer in the first soft-switching control device, for the bridge the operation of the circuit before a predetermined time after the positive half cycle of the power switch and turn off a predetermined time before the removal of the load is connected with the positive half cycle and for rectifying the secondary side output of the transformer; I) in the transformer a second soft switch control device for the negative half cycle of operation of the circuit of the secondary side of the bridge circuit operation until a predetermined time after the negative half cycle of the power switch and turn off a predetermined time before the removal of the load and the secondary side of the transformer is connected and a negative half cycle of the output rectifier.

一种实现功率开关的零电流开通和关断的电路,包括一变压器,其原边侧与一电源相接,副边侧与负载相接,其特征在于,所述电路包括一主开关单元,包含若干功率开关,分别设置在所述变压器原边侧的正负半周工作电路;和一软开关控制单元,与负载端相串连,用于在所述主开关单元的所述每一功率开关开通后的一预定时刻之前以及关断前一预定时刻切除所述负载与所述变压器副边侧的连接。 Zero-current turn on and off a circuit for implementing the power switch, comprising a transformer having a primary side and a phase power source, the secondary side in contact with the load, characterized in that, said circuit comprising a main switching unit, each of said power switch and a soft switching unit, in series with the load end, for the main switching means; power switch comprises a plurality of respectively positive and negative half-cycle work provided the primary side circuit of the transformer before opening a predetermined time after a predetermined time and the connection of the secondary side of the load cut off before the transformer.

所述的电路,其中,所述软开关控制单元为一功率开关元件,其漏极和源极连接在所述变压器和所述负载之间。 The circuit, wherein said control unit is a soft switching power switching element, its drain and source connected between the transformer and the load.

所述的电路,其中,所述电路还包括滤波单元,包含一输出滤波电感,与所述负载相串连;和一电容,自所述滤波电阻与所述负载的节点与所述负载相并联。 The circuit, wherein said circuit further comprises a filter unit, comprising an output filter inductance, in series with the load; and a capacitor, since the filter resistor and the load node and the load in parallel .

所述的电路,其中,所述电路还包括一续流元件,自所述软开关控制单元与所述滤波电感的节点与所述电感和所述电容构成回路。 The circuit, wherein said circuit further comprises a freewheeling element, from the soft-switching control unit of the node and the filter inductor and the capacitor form a loop inductance.

所述的电路,其中,所述续流元件为一二极管,其阴极与所述软开关控制单元与所述滤波电感的节点相接。 The circuit, wherein the element is a freewheeling diode having a cathode and the soft-switching control unit and the node of the filter inductor in contact.

所述的电路,其中,所述续流元件为一电容元件。 The circuit, wherein said capacitive element is a freewheeling element.

所述的电路,其中,所述电路还包括输出整流单元,连接在所述软开关元件与所述变压器副边之间。 The circuit, wherein said output circuit further comprises a rectifying means connected between the secondary side of the soft switching element and the transformer.

所述的电路,其中,所述主开关单元为桥式电路。 The circuit, wherein the switch unit is a main bridge circuit.

所述的电路,其中,所述软开关控制单元包含第一功率开关,连接在所述变压器副边侧,用于所述主开关单元的工作在正半周的功率开关开通后的一预定时刻以及关断前一预定时刻切除所述负载与所述变压器副边侧的连接和用于正半周输出整流;第二功率开关,连接在所述变压器副边侧,用于所述主开关单元的工作在负半周的功率开关开通后的一预定时刻以及关断前一预定时刻切除所述负载与所述变压器副边侧的连接和用于负半周输出整流。 The circuit, wherein the soft switching operation of said control means comprises a first power switch connected between the secondary side of said transformer, said main switching means for a predetermined time after the positive half cycle of the power switch and the opening off a predetermined time before the removal of the load is connected with the positive half cycle and for rectifying the secondary side output of the transformer; a second power switch connected on the secondary side of said transformer, said main switching means for operating at a predetermined time after the negative half cycle of the power switch and turn off a predetermined time before the removal of the load is connected with the secondary side of the transformer and means for rectifying the negative half cycle of the output.

一种实现功率开关的零电流开通和关断的控制方法,包括a)在一变压器的原边侧设置由主功率开关构成的全桥控制电路;b)将所述全桥控制电路的正半周及负半周工作的两个桥臂上的任一开关设置成软开关控制单元;c)所述任一桥臂上的主功率开关开通后一预定时刻开通所述软开关控制单元,用于在所述主功率开关开通过程中通过切除负载实现该主功率开关的零电流开通;d)所述任一桥臂上的所述主功率开关关断前一预定时刻,关断所述软开关控制单元,用于在所述主功率开关关断过程中通过切除负载实现所述主功率管的零电流关断。 Zero current turn off and a control method for realizing the power switch, comprising a) a full-bridge provided with a primary side of the transformer consisting of a main power switch control circuit; b) the full bridge circuit, positive half cycle control and any two of the negative half cycle of the bridge arm is arranged to switch a soft switching unit to work; c) according to any one after the main power switch bridge arm to open a predetermined time to open the soft switching control means for the main power switch is opened during zero-current load achieved by cutting the main power switch is open; D) according to any one bridge arm of the main power switch is turned off before a predetermined time, turning off the soft switch control means for cutting off the load current zero by implementing the main power transistor in the main power switch off process.

一种实现功率开关的零电流开通和关断的电路,包括一变压器,其原边侧与一电源相接,副边侧与负载相接;和一全桥控制电路,由功率开关管组成,连接在所述变压器的原边侧,其中,所述全桥控制电路包括第一桥臂,用于所述电路的正半周控制,具有一主开关和一软开关,其中该软开关分别在该主开关开通后的一预定时刻之前开通以及在该主开关关断前一预定时刻关断;和第二桥臂,用于所述电路的负半周控制,具有一主开关和一软开关,其中该软开关分别在该主开关开通后的一预定时刻之前开通以及在该主开关关断前一预定时刻关断。 Zero-current turn on and off a circuit for implementing the power switch, comprising a transformer having a primary side and a phase power source, the secondary side in contact with the load; and controlling a full-bridge circuit composed of the power switch, connected to the primary side of the transformer, wherein the full-bridge control circuit comprises a first bridge arm, for the positive half cycle of the control circuit, having a main switch and a soft switch, wherein the switches are in the soft opening a predetermined time after the main switch is opened and before a predetermined time before the main switch oFF oFF; and a second arm, for the negative half cycle of the control circuit, having a main switch and a software switch, wherein the soft switches are opened before a predetermined time after the opening of the main switch and the main switch is turned off a predetermined time before shutdown.

根据本发明的一个方面,本发明由于在负载与输出端之间加入一个辅助功率开关管,通过将负载切除的方法来实现功率开关管的零电流开通和关断,因此不需要在电路中加谐振电感或谐振电容来实现软开关。 According to one aspect of the present invention, the present invention, since the load between the output terminal addition of an auxiliary power switch to achieve zero current turn the power switch on and off by the process of the removal of the load, and therefore no need to add in the circuit a resonant inductor or a resonant capacitor to achieve soft switching.

根据本发明的再一个方面,辅助开关管由于关断速度快,同时由于箝位元件的作用,该辅助开关关断前后的电压差很小,可以实现零电压关断。 According to a further aspect of the present invention, since the auxiliary switch turn-off speed is fast, and because of the clamp member, the auxiliary switch voltage difference before and after the turn-off is small, can achieve zero voltage turn-off. 因此,本发明的电路结构简单,同时实现了主功率开关、辅助开关的软开关,从而可以明显提高变换器工作效率,具有广泛的应用前景。 Thus, the circuit structure of the present invention is simple, while achieving the main power switch, soft switching of auxiliary switch, which can significantly improve the converter efficiency, has a wide application prospect.

下面结合附图通过对本发明较佳实施例的描述,将使本发明的上述目的和优点显而意见。 DRAWINGS description of the preferred embodiments of the present invention, the above objects and advantages will make the present invention apparent views.

图1A是一种现有技术的利用谐振电路的自然过零来实现软开关的电路图;图1B是图1A所示电路的工作波形图;图2是又一种现有技术的同时利用辅助开关和谐振电路来实现的软开关的电路图;图3是本发明的一个较佳实施例的电路图,其中辅助开关设置在变压器的副边侧;图4A-4C是图3所示电路的功率管的驱动波形图;图5是本发明又一个较佳实施例的电路图,其中利用一个电容元件作为箝位元件;图6是本发明另一个较佳实施例的电路图,其中输出整流电路元件同时作为软开关的控制元件;图7A-7C是图6中功率开关管的驱动波形图;图8是本发明的再一个较佳实施例的电路图,其中利用利用全桥电路的两个桥臂中分别设置一软开关。 1A is using the natural zero-crossing of the resonant circuit to a prior art circuit diagram of a soft switching; FIG. 1B is a waveform diagram shown in FIG. 1A circuit; FIG. 2 is another prior art while using the auxiliary switch and a circuit diagram of a soft switching resonant circuit implemented; FIG. 3 is a circuit diagram of a preferred embodiment of the present invention, the embodiment wherein the auxiliary switch provided on the secondary side of the transformer; FIGS. 4A-4C are shown in Figure 3 of the power transistor circuit driving waveforms; FIG. 5 is a circuit diagram of another preferred embodiment of the present invention, wherein a capacitive element using a clamping element; FIG. 6 is a circuit diagram of another preferred embodiment of the present invention, wherein the output rectifying circuit as a soft member simultaneously control switching element; FIGS. 7A-7C is a driving waveform diagram of the power switch 6; FIG. 8 is a circuit diagram of another embodiment of the present invention is a preferred embodiment, wherein the use of two bridge arms using the full bridge circuit are provided in a soft switch.

图9A-9D是图8所示电路中功率开关的驱动波形图。 Figures 9A-9D is a driving waveform diagram of a power switch circuit 8 shown in FIG.

下文,将详细描述本发明。 Hereinafter, the present invention will be described in detail.

图3所示的是本发明的第一个较佳实施例的电路200,它包括一变压器(T1)202;一连接在该变压器202原边侧的全桥电路,由Q1A、Q2A、Q1B和Q2B组成;一设置在变压器副边侧的输出整流电路206,由D1和D2组成;一与该输出整流电路206相接的开关管208(Q3);一输出滤波电路210,由滤波电感L1和C1组成;和,一续流元件212。 The first circuit 200 is a preferred embodiment of the present invention shown in FIG. 3, it includes a transformer (Tl) 202; a full bridge circuit 202 is connected to the primary side of the transformer, the Q1A, Q2A, Q1B and Q2B composition; a provided on the secondary side of the transformer output rectifying circuit 206 composed of D1 and D2; a rectifying circuit 206 and the output contact switch 208 (Q3); an output filter circuit 210, and a filter inductor L1 C1 composition; and, a freewheeling element 212.

一般的全桥电路的驱动波形如图4A-4B所示,在这种驱动脉冲的驱动下,功率开关管是硬开关,开关损耗大。 General driving waveform of the full bridge circuit shown in FIG. 4A-4B, in such a drive pulse driving the power switch is a hard switch, a large switching loss. 为了便于全桥电路中的功率管零电流开通和关断,本发明的电路200与一般桥式电路相比,其输出侧加入了一个开关管208,在全桥电路204的管Q1A,Q1B,Q2A,Q2B关断前,先令开关管208关断,这样相当于变压器负载被切除掉,变压器202是空载的。 In order to facilitate power tube zero current turn in the full-bridge circuit on and off, the circuit according to the present invention compared with the normal bridge circuit, the output side of a switch 200 is added 208, in the full bridge circuit 204 of tube Q1A, Q1B, Q2A, Q2B off before, shilling switch 208 is turned off, this is equivalent to a transformer load is cut off, the transformer 202 is unloaded. 于是如果忽略激磁电流,管Q1A,Q1 B,Q2A,Q2B的电流为零,这样管Q1A,Q1B,Q2A,Q2B是在电流几乎为零的情况下关断。 So if the exciting current is ignored, the pipe Q1A, Q1 B, Q2A, Q2B current is zero, so that the tube Q1A, Q1B, Q2A, Q2B is almost zero when the current is turned off. 同样地,本发明在管Q1A,Q1B,Q2A,Q2B开通后才开通Q3,这样在管Q1A,Q1B,Q2A,Q2B的开通过程中,相当于变压器202空载,于是功率管Q1A,Q1B,Q2A,Q2B实现了零电流开通。 Likewise, the present invention is opened only after the tube Q1A, Q1B, Q2A, Q2B opening of Q3, so that the tube Q1A, Q1B, Q2A, Q2B opening process, the load corresponds to the transformer 202, then the power transistor Q1A, Q1B, Q2A , Q2B achieve a zero current turn.

其具体的工作过程分别参阅图4A所示的Q1A、Q2B的驱动波形,图4B所示的Q2A、Q1B的驱动波形和图4C所示的辅助开关208的驱动波形。 The specific working process, respectively, see FIG Q1A 4A, Q2B driving waveform, Q2A shown in Figure 4B, the auxiliary switch shown in FIG. 4C Q1B driving waveforms and the driving waveform 208 of FIG.

设在一个周期的开始时刻,功率管Q1A、Q1B、Q2A、Q2B、Q3均处于关断状态,输出滤波电路210的电感L1通过续流元件212,如二极管D3续流,负载(未示出)由输出滤波电感L1和电容C1供电。 Start times in a cycle, the power transistor Q1A, Q1B, Q2A, Q2B, Q3 are in the OFF state, inductor L1 through the freewheeling element output filter circuit 210, 212, such as a diode D3 freewheeling load (not shown) inductor L1 and capacitor C1 are powered by the output filter. 在T0时刻开通Q1A、Q2B,由于此刻管208关断,通过Q1A、Q2B的电流仅有激磁电流,无负载电流,激磁电流非常小,于是Q1A、Q2B在零电流状态下开通。 Opened at time T0 Q1A, Q2B, since the tube 208 is turned off at the moment, through Q1A, Q2B only current magnetizing current, no-load current, the excitation current is very small, so Q1A, Q2B opened at zero current state.

在T1时刻,功率管208开通,负载端接入变压器202,流经管Q1A、Q2B的电流逐步增大,续流二极管D3关断,负载由变压器202原边提供能量。 At time T1, the power tube opening 208, the access load side transformer 202, through the tube QlA, Q2B current is gradually increased, a freewheeling diode D3 is turned off, the load 202 powered by the primary side of the transformer.

在T2时刻,功率管208关断,二极管D3导通,电感L1通过二极管D3续流。 At time T2, the power transistor 208 is turned off, the diode D3 conducts, inductor L1 through the freewheeling diode D3.

在T3时刻,由于负载已被切除,变压器T1空载,功率管Q1A、Q2B的电流为零(忽略变压器激磁电流),此刻关断管Q1A、Q2B是零电流关断。 At time T3, the load was removed, no-load transformer T1, the power transistor QlA, Q2B current is zero (neglecting the transformer exciting current), the moment Shutoff QlA, Q2B zero current turn-off.

在T4时刻,开通Q1B、Q2A,此时由于功率管208处于关断状态,变压器是空载,管Q1B、Q2A零电流开通。 At time T4, the opening Q1B, Q2A, at this time since the power transistor 208 in the off state, no-load transformer, tube Q1B, Q2A zero current turn.

在T5时刻,功率管Q3开通,负载端接入变压器,流经Q2A、Q1B的电流逐步增大,续流二极管D3关断,负载由变压器202的原边提供能量。 At time T5, the power transistor Q3 is turned on, the access load side of the transformer, passing through Q2A, Q1B current is gradually increased, a freewheeling diode D3 is turned off, the load 202 powered by the primary side of the transformer.

在T6时刻,功率管208关断,二极管D3导通,电感L1通过二极管D3续流。 At time T6, the power transistor 208 is turned off, the diode D3 conducts, inductor L1 through the freewheeling diode D3.

在T7时刻,由于负载已被切除,变压器空载,功率管Q2A、Q1B的电流为零(忽略变压器激磁电流),此刻管Q2A、Q1B是在零电流状态下关断。 At time T7, since the load has been cut, no-load transformer, power transistor Q2A, Q1B current is zero (neglecting the transformer exciting current), the moment the tube Q2A, Q1B is turned off at zero-current state.

在T8时刻,新一个周期的开始。 T8 at the time, to start a new cycle.

特别的是,电路200中增加的功率开关管208,关断速度很快。 In particular, the circuit 200 increases the power switch 208 is turned off quickly. 由于二极管D3结电容较大,该管的关断是零电压关断的。 Since the larger junction capacitance diode D3, turning off the tube voltage is zero off. 值得一提的是,主开关与本发明的辅助开关Q3开通或关断的间隔时间是与开关Q3本身的特性参数相关的。 It is worth mentioning that the main switch and auxiliary switch Q3 of the present invention, the opening or the off time interval associated with its own characteristics parameter switch Q3.

图5所示的是本发明的另一个实施例的电路300,是将续流元件312用小电容C2替换了图3所示实施例中的二极管D3,这样可以进一步地消除了该二极管D3的导通损耗。 FIG 5 is a circuit 300 according to another embodiment of the invention, the freewheeling element 312 is replaced in the embodiment of Figure 3 shown with a small capacitance diode D3 C2, which may further eliminate the diode D3 conduction losses.

图6所示的是本发明又一个实施例的电路400,其中输出整流电路406是利用功率开关管S5、S6替换了图3所示电路200的整流输出电路206中的输出整流二极管D1、D2,通过控制开关管S5和S6的驱动波形,同样可以实现主开关零电流的导通和关断,如图7A-7C所示的驱动波形图。 The present invention is a further embodiment of a circuit 400 of the embodiment shown in FIG 6, wherein the output rectifying circuit 406 using the power switch S5, S6 replaces the rectifier circuit 206 output circuit 200 shown in FIG. 3 in the output rectifier diodes D1, D2 by controlling the switch S5 and S6, the driving waveform, the main switch can be realized likewise zero current turn-on and turn-off, driving waveforms shown in FIG. 7A-7C.

设在一个周期开始时刻,功率管S1-S4和输出整流管S5-S6均处于关断状态,输出滤波电路410的电感L1通过续流元件412,如二极管D1续流,负载(未示出)由输出滤波电感L1和电容C1供电。 Provided at a starting time period, and a power transistor output rectifiers S1-S4 S5-S6 are in an off state, inductor L1 through the freewheeling circuit 410 output filter element 412, such as a freewheeling diode D1, a load (not shown) inductor L1 and capacitor C1 are powered by the output filter. 在T0时刻在正半周开通S1和S4,由于此刻正半周输出整流的管S5关断,通过管S1和S4的电流仅有激磁电流,无负载电流,激磁电流非常小,于是S1和S4在零电流状态下开通。 At time T0 in the positive half cycle of the opening S1 and S4, since the moment positive half cycle of the rectified output pipe S5 is turned off, S1 and only the excitation current of the current S4 through, no-load current, the excitation current is very small, so S1 and S4 zero current open state.

在T1时刻,功率管S5开通,负载端接入变压器402,流经管S1和S4的电流逐步增大,续流二极管D1关断,负载由变压器402原边提供能量。 At time T1, the power tube S5 opened, access to the load side of the transformer 402, current flows S1 and S4 administered is gradually increased, freewheeling diode D1 is turned off, the load 402 is powered by the transformer primary.

在T2时刻,管S5关断,二极管D1导通,电感L1通过二极管D1续流。 At time T2, the tube S5 is turned off, the diode D1 is turned on, the inductor L1 through freewheeling diode D1.

在T3时刻,由于负载已被切除,变压器402空载,功率管S1和S4的电流为零(忽略变压器激磁电流),此刻关断管S1和S4是零电流关断。 At time T3, the load was removed, no-load transformer 402, power S1 and S4 of the electric current is zero (neglecting the transformer exciting current), the moment S1 and S4 off zero current turn-off.

在T4时刻,开通负半周工作的管S3和S2,此时由于负半周输出整流的管S6处于关断状态,变压器是空载,管S3和S2是零电流开通。 At time T4, the opening work of the negative half cycle S3 and S2, at this time since the negative half cycle of the rectified output pipe S6 is in an off state, a no-load transformer, S3 and S2 are zero current turn.

在T5时刻,功率管S6开通,负载端接入变压器402,流经管S3和S2的电流逐步增大,续流二极管D1关断,负载由变压器402原边提供能量。 At time T5, the opening of the power tube S6, the access load side transformer 402, a current flowing through the tubes S2 and S3 is gradually increased, freewheeling diode D1 is turned off, the load 402 is powered by the transformer primary.

在T6时刻,管S6关断,二极管D1导通,电感L1通过二极管D1续流。 At time T6, the pipe S6 is turned off, the diode D1 is turned on, the inductor L1 through freewheeling diode D1.

在T7时刻,由于负载已被切除,变压器402空载,功率管S3和S2的电流为零(忽略变压器激磁电流),此刻关断管S3和S2是零电流关断。 At time T7, since the load has been cut, no-load transformer 402, current power S3 and S2 is zero (neglecting the transformer exciting current), the moment S3 and S2 turn-off is zero current shutdown.

在T8时刻,新一个周期的开始。 T8 at the time, to start a new cycle.

由此可见,本发明的实施例中同时将输出整流功率管用作软开关控制单元,从而可以去掉图3所示实施例中的辅助开关管Q3。 Thus, embodiments of the present invention, while the tube is used as the soft output rectified power switching control unit shown in Figure 3 may be eliminated so that the auxiliary switching transistor Q3 in the embodiment.

根据本发明的技术方案,图8所示的是再一个较佳实施例,即电路500。 According to the present invention, shown in FIG. 8 is a further preferred embodiment, i.e., circuit 500. 在变压器502的原边侧设置全桥电路204,包括功率管Q1A、Q1B、Q2A、Q2B;副边侧连接有输出整流电路506,包含二极管D1和D2;输出滤波电路5 10,包括电感L1和电容C1;以及续流元件,如二极管D3。 In the primary side of the transformer 502 of the full bridge circuit 204 comprises a power transistor Q1A, Q1B, Q2A, Q2B; secondary side is connected to the output of the rectifier circuit 506 comprising diodes D1 and D2 of; output filter circuit 510 includes an inductor L1 and a a C1 capacitor; and a freewheeling element, such as a diode D3.

本发明将该整流电路的两个桥臂中均设置成一个主开关和一个辅助开关,例如正半周桥臂上设管Q1A为主开关,而管Q2B为辅助开关;负半周桥臂上设管Q2A是主开关,Q2B是辅助开关。 The present invention, two bridge arms rectification circuit are disposed a main switch and an auxiliary switch bridge arm, for example, a positive half cycle of a tube main switch Q1A, Q2B and pipe auxiliary switch; the negative half bridge arm of a tube The main switch is Q2A, Q2B is an auxiliary switch. 其驱动波形图请参见图9A-9D所示。 A driving waveform diagram shown in FIG see Figure 9A-9D.

设在一个周期的开始时刻,功率管Q1A、Q1B、Q2A、Q2B均处于关断状态,输出滤波电路510的电感L1通过续流元件212,如二极管D3续流,负载(未示出)由输出滤波电感L1和电容C1供电。 Start times in a cycle, the power transistor Q1A, Q1B, Q2A, Q2B are in the OFF state, the inductance of the output filter circuit 510 L1 through the freewheeling element 212, such as a diode D3 is a freewheeling, a load (not shown) by the output filter inductor L1 and a capacitor C1 supply. 在T0时刻开通Q1A,由于此刻管Q2B关断,于是Q1A在零电流状态下开通。 Q1A opened at time T0, because now the tube Q2B off, thus opening Q1A at zero current state.

在T1时刻,管Q2B开通,流经管Q1A、Q2B的电流逐步增大,续流二极管D3关断,负载由变压器502原边提供能量。 At time T1, Q2B open tube, through the tube QlA, Q2B current is gradually increased, a freewheeling diode D3 is turned off, the load 502 is powered by the transformer primary.

在T2时刻,管Q2B关断,二极管D3导通,电感L1通过二极管D3续流。 At time T2, the tube Q2B off, diode D3 is turned on, the inductor L1 through the freewheeling diode D3.

在T3时刻,由于负载已被切除,变压器T1空载,功率管Q1A的电流为零(忽略变压器激磁电流),此刻关断管Q1A是零电流关断。 At time T3, the load was removed, no-load transformer T1, the current of the power transistor Q1A is zero (neglecting the transformer exciting current), the tube Q1A is turned off at the moment zero-current turn-off.

在T4时刻,开通Q2A,此时由于管Q1B处于关断状态,管Q2A零电流开通。 At time T4, the opening Q2A, Q1B this time, since the tube is in the off state, the tube Q2A zero current turn.

在T5时刻,管Q1B开通,负载端接入变压器,流经Q2A、Q1B的电流逐步增大,续流二极管D3关断,负载由变压器502的原边提供能量。 At time T5, Q1B tube opening, the access load side of the transformer, passing through Q2A, Q1B current is gradually increased, a freewheeling diode D3 is turned off, the load 502 powered by the primary side of the transformer.

在T6时刻,管Q1B关断,二极管D3导通,电感L1通过二极管D3续流。 At time T6, the tube Q1B off, diode D3 is turned on, the inductor L1 through the freewheeling diode D3.

在T7时刻,由于负载已被切除,变压器空载,功率管Q2A、Q1B的电流为零(忽略变压器激磁电流),此刻管Q2A是在零电流状态下关断。 At time T7, since the load has been cut, no-load transformer, power transistor Q2A, Q1B current is zero (neglecting the transformer exciting current), at the moment the pipe is Q2A zero current turn-off state.

在T8时刻,新一个周期的开始。 T8 at the time, to start a new cycle.

由此可见,如果将辅助开关设置在变压器的原边侧,同样可以利用将负载切除的方法实现主功率开关的零电流开通或关断。 Thus, if the auxiliary switch provided on the primary side of the transformer, the same method can be used to achieve zero load current cut the main power switch turn on or off.

Claims (14)

1.一种实现功率开关的零电流开通和关断的控制方法,包括a)在一变压器的原边侧设置若干主功率开关;b)在一变压器的副边侧设置一软开关控制单元,与负载相接;c)在所述主功率开关开通后一预定时刻开通所述软开关控制单元,用于在所述主功率开关开通过程中阻断所述负载与所述变压器副边侧的连接;d)在所述主功率开关关断前一预定时刻,关断所述软开关控制单元,用于在所述主功率开关关断过程中阻断所述负载与所述变压器副边侧的连接。 Zero current turn off and control methods implemented 1. A power switch comprising a) providing a plurality of main power switch on the primary side of a transformer; b) a soft-switch control unit disposed in the secondary side of a transformer, and a load contact; c) at a predetermined timing after the main power switch to open the opening of the soft switch control unit, for blocking the main power switch is on during the load and the secondary side of the transformer connection; D) at a predetermined time before the main power switch is turned off, turning off the soft switch control unit, for blocking the main power switch is turned off during the load and the secondary side of the transformer Connection.
2.根据权利要求1所述的方法,其中还包括e)在所述负载与所述软开关控制单元之间设置一滤波单元;f)在所述变压器副边侧设置一续流元件,与所述滤波单元构成回路,用于在所述软开关控制单元关断后,所述滤波单元的续流。 2. The method according to claim 1, further comprising e) a filter means disposed between said load and said soft switch control unit; F) provided with a freewheeling element on the secondary side of the transformer, and the filter unit to form a loop for said soft switch control unit turns off, the filtering unit freewheeling.
3.根据权利要求2所述的方法,其中还包括g)将所述主功率开关组成桥式电路;h)在所述变压器副边侧的正半周工作电路中设置第一软开关控制元件,用于所述桥式电路的工作在正半周的功率开关开通后的一预定时刻之前以及关断前一预定时刻切除所述负载与所述变压器副边侧的连接和用于正半周输出整流;i)在所述变压器副边侧的负半周工作电路中设置第二软开关控制元件,用于所述桥式电路的工作在负半周的功率开关开通后的一预定时刻之前以及关断前一预定时刻切除所述负载与所述变压器副边侧的连接和用于负半周输出整流。 3. The method according to claim 2, further comprising g) consisting of the main power switching bridge circuit; H) disposed in a first soft-switching control device operating circuit the positive half cycle of the secondary side of the transformer, the bridge circuit for operation before a predetermined time after the positive half cycle of the power switch and turn off a predetermined time before the removal of the load is connected with the positive half cycle and for rectifying the secondary side output of said transformer; i) providing a second soft switching device, said bridge circuit for operation before a predetermined time after the negative half cycle of the power switch and turn off the previous negative half cycle of operation of the circuit in the secondary side of the transformer cutting a predetermined time the load connected to the secondary side of the transformer and means for rectifying the negative half cycle of the output.
4.一种实现功率开关的零电流开通和关断的电路,包括一变压器,其原边侧与一电源相接,副边侧与负载相接,其特征在于,所述电路包括一主开关单元,包含若干功率开关,分别设置在所述变压器原边侧的正负半周工作电路;和一软开关控制单元,与负载端相串连,用于在所述主开关单元的所述每一功率开关开通后的一预定时刻之前以及关断前一预定时刻切除所述负载与所述变压器副边侧的连接。 A zero-current turn on and off the power switch of circuit implementation, includes a transformer having a primary side and a phase power source, the secondary side in contact with the load, characterized in that said circuit comprises a main switch unit, comprising a plurality of power switches are respectively provided on the positive and negative half-cycle operation of the circuit of the primary side of the transformer; and a soft switching unit, and the load end in series, the main switch for each unit before a predetermined time after the power switch is connected to a predetermined timing to open and the secondary side of the transformer and the load cut off before.
5.根据权利要求4所述的电路,其特征在于,所述软开关控制单元为一功率开关元件,其漏极和源极连接在所述变压器和所述负栽之间。 The circuit according to claim 4, wherein said control unit is a soft switching power switching element, its drain and source connected between the transformer and the negative plant.
6.根据权利要求5所述的电路,其特征在于,所述电路还包括滤波单元,包含一输出滤波电感,与所述负载相串连;和一电容,自所述滤波电感与所述负载的节点与所述负载相并联。 The circuit according to claim 5, characterized in that said circuit further comprises a filter unit, comprising an output filter inductance, in series with the load; and a capacitor, since the filter inductor and the load node in parallel with the load.
7.根据权利要求6所述的电路,其特征在于,所述电路还包括一续流元件,自所述软开头控制单元与所述滤波电感的节点与所述电感和所述电容构成回路。 The circuit according to claim 6, wherein said circuit further comprises a freewheeling element, from the beginning of the soft control node and the inductor unit and the filter inductor and the capacitor form a loop.
8.根据权利要求6所述的电路,其特征在于,所述续流元件为一二极管,其阴极与所述软开关控制单元与所述滤波电感的节点相接。 8. The circuit of claim 6, wherein said element is a freewheeling diode having a cathode and the soft-switching control unit and the node of the filter inductor in contact.
9.根据权利要求6所述的电路,其特征在于,所述续流元件为一电容元件。 9. The circuit according to claim 6, characterized in that the freewheeling element is a capacitive element.
10.根据权利要求6所述的电路,其特征在于,所述电路还包括输出整流单元,连接在所述软开关元件与所述变压器副边之间。 10. The circuit according to claim 6, wherein said circuit further includes an output rectifying means connected between the secondary side of the soft switching element and the transformer.
11.根据权利要求4所述的电路,其特征在于,所述主开关单元为桥式电路。 11. The circuit according to claim 4, characterized in that the main switch unit is a bridge circuit.
12.根据权利要求11所述的电路,其特征在于,所述软开关控制单元包含第一功率开关,连接在所述变压器副边侧,用于所述主开关单元的工作在正半周的功率开关开通后的一预定时刻以及关断前一预定时刻切除所述负载与所述变压器副边侧的连接和用于正半周输出整流;第二功率开关,连接在所述变压器副边侧,用于所述主开关单元的工作在负半周的功率开关开通后的一预定时刻以及关断前一预定时刻切除所述负载与所述变压器副边侧的连接和用于负半周输出整流。 12. The circuit as claimed in claim 11, wherein said soft switch control unit comprises a first power switch connected between the secondary side of said transformer, said main switching unit for work in the positive half cycle of the power a predetermined time after the switch is on and a predetermined time before cutting off the connection to the load and means for rectifying the positive half cycle of the output of the transformer secondary side; a second power switch connected on the secondary side of the transformer, with working to the main switch means at predetermined timing after a negative half cycle of the power switch and turn off a predetermined time before the removal of the load is connected with the secondary side of the transformer and means for rectifying the negative half cycle of the output.
13.一种实现功率开关的零电流开通和关断的控制方法,包括a)在一变压器的原边侧设置由主功率开关构成的全桥控制电路;b)将所述全桥控制电路的正半周及负半周工作的两个桥臂上的任一开关设置成软开关控制单元;c)所述任一桥臂上的主功率开关开通后一预定时刻开通所述软开关控制单元,用于在所述主功率开关开通过程中通过切除负载实现该主功率开关的零电流开通;d)所述任一桥臂上的所述主功率开关关断前一预定时刻,关断所述软开关控制单元,用于在所述主功率开关关断过程中通过切除负载实现所述主功率管的零电流关断。 A zero-current turn-on and turn-off control method to achieve the power switch, comprising a) a full-bridge provided with a primary side of the transformer consisting of a main power switch control circuit; b) the full-bridge control circuit two bridge arm positive half cycle and negative half cycle operating either of the switches is arranged to control soft switching unit; c) a rear axle according to any of the main power switch arm opening a predetermined opening time of the soft switch control unit, with the main power switch to turn the load by cutting during ZCS turn of the main power switch; D) according to any one bridge arm of the main power switch is turned off before a predetermined time, turning off the soft switching control means for the main power switch is turned off during the removal of the load to achieve zero current through the tubes of the main power is turned off.
14.一种实现功率开关的零电流开通和关断的电路,包括一变压器,其原边侧与一电源相接,副边侧与负载相接;和一全桥控制电路,由功率开关管组成,连接在所述变压器的原边侧,其特征在于,所述全桥控制电路包括第一桥臂,用于所述电路的正半周控制,具有一主开关和一软开关,其中该软开关分别在该主开关开通后的一预定时刻之前开通以及在该主开关关断前一预定时刻关断;和第二桥臂,用于所述电路的负半周控制,具有一主开关和一软开关,其中该软开关分别在该主开关开通后的一预定时刻之前开通以及在该主开关关断前一预定时刻关断。 Zero current turn off and achieve power circuit 14. A switch, comprising a transformer having a primary side and a power source for a secondary contact with the load side; and a full-bridge circuit controlled by the power switch , which connects the primary side of the transformer, wherein the full-bridge control circuit comprises a first bridge arm, for the positive half cycle of the control circuit, having a main switch and a soft switch, wherein the soft switches are opened before a predetermined time after the main switch is on and a predetermined time before the main switch oFF oFF; and a second arm, for the negative half cycle of the control circuit, having a main switch and a soft-switch, wherein the soft switches are opened before a predetermined time after the opening of the main switch and the main switch is turned off a predetermined time before shutdown.
CNB011226463A 2001-06-26 2001-06-26 Control method of zero current on or off for power switch and its circuit CN1158746C (en)

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