WO2003052915A1 - Procede de conversion de puissance numerique et dispositif a tension nulle - Google Patents

Procede de conversion de puissance numerique et dispositif a tension nulle Download PDF

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Publication number
WO2003052915A1
WO2003052915A1 PCT/CN2002/000863 CN0200863W WO03052915A1 WO 2003052915 A1 WO2003052915 A1 WO 2003052915A1 CN 0200863 W CN0200863 W CN 0200863W WO 03052915 A1 WO03052915 A1 WO 03052915A1
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Prior art keywords
zero
voltage
digital power
switching device
power converter
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PCT/CN2002/000863
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English (en)
French (fr)
Inventor
Hutang Fang
Hua Fang
Original Assignee
Hutang Fang
Hua Fang
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Publication date
Application filed by Hutang Fang, Hua Fang filed Critical Hutang Fang
Priority to JP2003553698A priority Critical patent/JP2005513985A/ja
Priority to US10/497,436 priority patent/US7215040B2/en
Priority to AU2002349471A priority patent/AU2002349471A1/en
Priority to EP02782656A priority patent/EP1478084B1/en
Priority to AT02782656T priority patent/ATE545191T1/de
Publication of WO2003052915A1 publication Critical patent/WO2003052915A1/zh

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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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/538—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a push-pull configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33571—Half-bridge at primary side of an isolation transformer

Definitions

  • the invention relates to a zero-voltage conversion digital power processing method and device.
  • the switching device (or circuit) is determined by the characteristics of the switching device (or circuit). There is a loss on or off. The magnitude of the loss is the integration of the product of the current of the switching device (or circuit) and the terminal voltage on the switching time. The higher the switching frequency, the greater the switching loss, especially at high switching frequencies. In the state, it becomes the main part of the loss, and increases the total switching loss, sometimes even exceeding 15% of the total power. This switching loss will inevitably have an adverse effect on the switch ⁇ (or circuit), such as an increase in operating temperature, a drift in the operating parameters of the switching device (or circuit), and so on.
  • the purpose of the present invention is to overcome the shortcomings of the prior art, and provide a method and device for zero-voltage conversion digital power processing, which can perform zero-voltage digital conversion at a non-constant frequency and / or under different load currents.
  • the zero-voltage conversion digital power converter of the present invention two switching devices respectively connected to a power source are connected in parallel with a capacitor and an anti-parallel diode to form the upper and lower arm circuits of the half-bridge circuit, and are connected to the output terminal through an inductor.
  • the two switching devices of the zero-voltage conversion digital power processing method and device of the present invention can be turned off at the same time. At this time, the converter is in an output-free state, and one switching device can be turned off. The switching device is turned on or turned off. During the above-mentioned turn-on and turn-off processes, the switching device is in an operating condition where its terminal voltage is zero or near zero.
  • the invention also provides a digital power conversion device using the zero-voltage conversion digital power converter as described above, which includes:
  • a control circuit connected to the zero-voltage-converted digital power converter.
  • An input end of the control circuit is connected to an input signal, and two output ends of the control circuit are respectively controlled by switching of the switching device of the zero-voltage-converted digital power converter. Terminal-phase connection for providing switching control voltage for the switching device;
  • the zero-voltage conversion digital power converter works in cooperation with the control circuit so that the dead time interval between the two control voltages is zero is greater than or equal to the corresponding change from the off-
  • the capacitance of the turned-on switching device is discharged to the time when its voltage is zero, so that when the switching device in the zero-voltage conversion digital power converter is turned on and off, the terminal voltage is zero or close to zero.
  • the present invention further provides a method for performing zero-voltage digital power conversion by using the digital power conversion device described above, which includes the following steps:
  • the control circuit is configured according to the determined discharge time so that a dead time interval between two control voltage signals outputted by the control circuit is greater than or equal to the corresponding discharge time, thereby ensuring that the two switching devices are Under the control of the switch control voltage, its terminal voltage is zero or close to zero when it is turned on and off.
  • FIG. 1 is a circuit diagram of an embodiment of a zero-voltage conversion digital power converter according to the present invention
  • FIG. 2 is a block diagram showing the structure of a zero-voltage conversion digital power conversion device according to the present invention
  • FIG. 3 is a timing diagram of two control signals of the zero-voltage conversion digital power processing method and device according to the present invention.
  • the zero voltage conversion digital power conversion device and method of the present invention are described in detail below with reference to FIGS. 1-3.
  • FIG. 1 two switching devices T 2 respectively connected to a power source are connected in parallel with a capacitor d, C 2 and an anti-parallel diode DD 2 to form an upper and lower arm circuit of a half-bridge circuit, and an inductor L is connected to an output node 3 is connected, a capacitor C is connected between the node 3 and the ground, and the working appliance R is provided with electric power through the node 3.
  • FIG. 2 is a block diagram showing a configuration of a digital power conversion device according to the present invention.
  • the device includes two modules connected in sequence: a zero-voltage conversion digital power converter B and a control circuit module.
  • the module B is the above-mentioned zero-voltage conversion digital power converter
  • the input terminal 1 of the module A receives an input signal for which power conversion is needed, and its two output terminals are respectively connected with the two switching devices 1 and T in the module B.
  • a control voltage terminal 2 is connected to 1 and 2 to provide a switching control voltage U T1 and U T2 for two switching devices.
  • two control signals generated by the signal through the control circuit are respectively input to the switching device TT 2 by the nodes 1 and 2 to control the switching device T 2 to be turned on or Shut down.
  • the control signal input by the node 1 keeps the switching device 1 in an on state.
  • the power supply is connected to the output node 3 through the switching device and the inductor L, and works through the node 3
  • the electric appliance R provides a voltage V ls because the switching device 1 is in an on state and the switching device T 2 is in an off state.
  • a capacitor connected in parallel with the switching device ⁇ (the terminal voltage of ⁇ is zero, and the voltage in parallel with the switching device T 2 is zero.
  • the terminal voltage of the capacitor C 2 is V V2 (Vi is equal to V 2 ).
  • the capacitor (the terminal voltage of the capacitor is zero, That is, the switching device connected in parallel! The terminal voltage is zero, and the switching loss when it is turned off is zero.
  • this current discharges the capacitor C 2 and charges the capacitor until The terminal voltage of capacitor C 2 is negative, the diode D 2 is turned on, and the voltage at terminal C 2 is clamped to a negative voltage close to zero.
  • the terminal voltage of capacitor Ci is about
  • the control signal input by the node 2 makes T 2 when the switching device is turned on, the terminal voltage at this time since the capacitance C 2 is close to zero, the switching device T 2 is turned on, the terminal voltage is close to zero, the switching loss when the switching device is turned to zero Î ⁇ 2 .
  • U T1 is a control gate voltage of 1
  • U T2 is a control gate voltage of T 2 .
  • tH; 2 is the state 1 1 is on, and T 2 is off.
  • t 2 -t 3 is state 2 shutdown, and T 2 is shutdown.
  • t 3 -t 4 is off for state 3 and T 2 is on.
  • t 4 -t s is state 4 shutdown and T 2 is shutdown.
  • t 5 -t 6 is state 5: Repeat state 1.
  • state 3 ends and state 4 starts.
  • the zero-voltage digital power conversion method includes the following steps: providing the above-mentioned digital power conversion device; and converting each circuit parameter d, C 2 , L, C in the zero-voltage conversion digital power converter , R determines the switching time of each switching device Ti, T 2 by the current of the inductor L to the capacitor in parallel with it ( ⁇ and c 2 discharge time to zero during discharge from turn-off to conduction; according to the discharge time configuration determined by the above fan)
  • the control circuit is such that the dead time interval between the two control voltage signals ⁇ Ti and U T2 that it outputs is greater than or equal to the corresponding discharge time, thereby ensuring that the two switching devices 1 and T 2 are at When the switch is turned on and off under the control of the switch control voltage, its terminal voltage is zero or close to zero.
  • ⁇ and (: 2 are the output capacitors of the field effect transistors! ⁇ And! ⁇ , Respectively, and CfC ⁇
  • the switch device ⁇ , ⁇ 2 is a FET.
  • the control signal is arbitrary
  • the working process can achieve zero voltage conversion at a non-constant frequency, and its switching loss can be reduced to less than 5%.
  • the loss is reduced, the switching frequency can be greatly increased To make it work in a wider frequency range.

Description

零电压转换数字功率处理方法及装置 技术领域
本发明涉及一种零电压转换数字功率处理方法及装置。 技术背景
数字功率变换必然在开关状态工作， 每次开和关过程总是在 有限的时间内完成， 开关器件（或电路） 这个开和关时间是由开 关器件（或电路） 自身特性决定的， 每次开或关都产生一次损耗， 其损耗的量值是开关器件（或电路） 的电流与端电压乘积对开关 时间的积分， 开关频率越高， 开关损耗越大， 特别是在开关频率 很高的状态下， 它成为损耗的主要部分， 并且增大了开关总损耗， 有时甚至超过总功率的 15%。这种开关损耗必然会对开关器^ (或 电路）产生不利的影响， 例如工作温度升高、 开关器件（或电路） 工作参数漂移， 等等。 为了降低开关损耗， 近期发展了多种软开 关技术， 其工作原理是在开关时间内使得开关器件（或电路） 的 电流或端电压为零， 或者接近于零， 从而达到减小损耗的效果。 但是至今这类软开关只能用在恒定频率控制的直流功率变换器 中， 而且其辅助电路相当复杂， 元器件数量多。 发明筒介
本发明的目的在于克服现有技术的缺陷， 提供一种零电压转 换数字功率处理方法及装置， 能够在非恒定频率下和 /或不同负载 电流下的零电压数字转换。
在本发明的零电压转换数字功率变换器中， 两个分别与电源 连接的开关器件各并联有一电容和反并联一个二极管， 构成半桥 电路的上下臂电路， 并通过一个电感与输出端连接。 在工作中， 本发明的零电压转换数字功率处理方法及装置的 两个开关器件可以同时关断， 此时该转换器处于无输出状态， 也 可以在一个开关器件关断的状态下， 另一开关器件由关断状态接 通， 或由接通状态关断。 在上述接通和关断过程中， 该开关器件 处于其端电压为零或接近零的工作状况。
本发明还提供了一种应用如上所述的零电压转换数字功率变 换器的数字功率变换装置， 其包括：
如上所述的零电压转换数字功率变换器；
与所迷零电压转换数字功率变换器相连接的控制电路， 该控 制电路的输入端与输入信号相连接， 其两个输出端分别与所述零 电压转换数字功率变换器的开关器件的开关控制端相连接， 用于 为所迷开关器件提供开关控制电压；
所述零电压转换数字功率变换器和所述控制电路配合工作， 以便所述两个控制电压都为零的死区时间间隔大于或等于由所述 电感电流对并联于相应的从关断变为导通的开关器件的电容放电 至其电压为零的时间， 从而实现当所述零电压转换数字功率变换 器中的开关器件在导通和关断时的端电压均为零或接近于零。
本发明又提供了一种利用如上述的数字功率变换装置进行零 电压数字功率变换的方法， 其包括以下步骤：
提供如上所述的数字功率变换装置；
由所述零电压转换数字功率变换器中的各电路参数确定各个 开关器件从关断到导通过程中由所述电感电流对与其并联的电容 放电到零的放电时间；
根据上述确定的放电时间配置所述控制电路，以使得其输出 的两个控制电压信号之间的死区时间间隔大于或等于相应的所述 放电时间， 从而保证所述两个开关器件在所迷开关控制电压的控 制下导通和关断时其端电压为零或接近于零。 本发明的具体功能、 特征和工作将通过实施例结合附图详细 说明， 下述实施例只是本发明的一个实施方案， 不是对被发明的 限定。 图面说明
图 1是本发明的零电压转换数字功率变换器的一个实施例的电 路图；
图 2是本发明的零电压转换数字功率变换装置的构成方框图； 图 3是本发明零电压转换数字功率处理方法及装置的两路控制 信号的时序图。 实施例说明
下面参照图 1-3佯细描述本发明的零电压转换数字功率变换 装置和方法。
在图 1中， 两个分别与电源连接的开关器件 T2各并联有 一个电容 d、 C2和反并联一个二极管 D D2, 构成半桥电路的 上下臂电路， 通过一个电感 L与输出端节点 3连接， 节点 3和地 之间接一个电容 C, 并通过节点 3给工作电器 R提供电功率。
图 2是本发明的数字功率变换装置的构成方框图。如图所示， 该装置包括依次连接的两个模块： 即零电压转换数字功率变换器 B和控制电路模块 。 其中， 模块 B就是上述的零电压转换数字 功率变换器， 模块 A的输入端 1接收需要对其进行功率转换的输 入信号， 且其两个输出端分别与模块 B中两个开关器件 1 和 T2 的控制电压端 1和 2相连接， 从而为该两个开关器件提供开关控 制电压 U T1 和 UT2。
在图 2 中， 由信号通过控制电路产生的两路控制信号分别由 节点 1、 2输给开关器件 T T2, 控制该开关器件 T2导通或 关断。
下面结合图 1和图 2来说明该零电压转换数字功率处理方法 及装置的一个工作循环过程。
开关器件 T2关断状态下， 由节点 1输入的控制信号保持该开 关器件 1 处于导通状态， 此时该电源经该开关器件 和电感 L 与输出端节点 3连接， 并通过节点 3给工作电器 R提供电压 Vls 由于该开关器件1 处于导通状态而开关器件 T2处于关断状态下， 与该开关器件 Ί 并联的电容（^的端电压为零， 与该开关器件 T2 并联的电容 C2的端电压为 V V2 ( Vi与 V2相等） 。 当由节点 1 输入的控制信号变为零时， 该开关器件！^关断， 此瞬间由于电容 (^的端电压为零， 即与其并联的开关器件！^端电压为零， 其关断 时的开关损耗为零， 与此同时， 由于电感 L中的电流必须连续， 该电流使该电容 C2放电和电容 的充电， 直到电容 C2的端电压 为负， 二极管 D2导通， 把 C2端电压箝位到接近于零的负电压， 此时， 而电容 Ci的端电压约为
Figure imgf000006_0001
从由节点 1输入的控制信号变为零的瞬间起， 经过电容 C2放 电和电容^的充电并使得电容 C2的端电压接近于零的延时 T后， 由节点 2输入的控制信号使该开关器件 T2导通， 此时由于电容 C2的端电压接近于零，该开关器件 T2导通时，其端电压接近于零， 该开关器件 Τ2导通时的开关损耗为零。
下面结合图 3的控制信号的时序图详细描述上述工作循环的 过程。 在图 3中示出图 2所述两路控制信号的时序关系， 图 3中 U T1为 1 的控制栅电压， UT2为 T2的控制栅电压。
图中 tH;2为状态 1 1 导通， T2关断。
图中 t2-t3为状态 2 关断， T2关断。
图中 t3-t4为状态 3 关断， T2导通。
图中 t4-ts为状态 4 关断， T2关断。 图中 t5-t6为状态 5: 重复状态 1。
工作过程如下：
假设起始为状态 1， 这时为 1 导通， T2关断， UCi=0， Uc2=Vi+V2, 电流由电源 Vi流经 1 、 L和 R形成回路， 到 t2时 状态 1结束， 状态 2开始。
状态 2起始时， ！ 关断， 因为 t2时， UC1=0, 所以 1 关断时 为零电压关断， 此时电感电流不能突变仍流向 3节点， 因 已关 断， 此时电感电流必须通过 QL充电和 C2放电来继续， 由于通常 (^和 是！^，！^的输出电容， 量值很小， L中电流很大， 只要很 短一段时间即可使 Ci充电到 Ud-Vi+Vz, C2放电到 UC2=0， 电感 仍在向节点 3流电流， 此时电容电压不会再变， 因！；^和！!^受 02的箝位， 电流是由电源 2的 "-" 端经 D2流向 L和 R, 直到 t3时状态 2结束， 状态 3开始。
状态 3起始时， T2导通， 因为 t3时， UC2=0, 所以 T2为零电 压导通， 同时 仍在关断， 电流由 V2的 " -" 端经 D2流向 L和 R, 这实质是电感电流的储能向 V2充电， 很快电感储能释放完， 电流变为零， 转变为 V2的 "+" 端经地向 R和 L再经 T2流向 V2 的 "-" 端形成电流， 此时电流方向改变为节点 3流向 L和 T2, 到 t4时状态 3结束， 状态 4开始。
状态 4起始时， T2关断， 因为 t4时， UC2=0, 所以 T2为零电 压关断， 电流不能经 Τ2流向电源， 只能向 Ci放电和 C2充电， 使 C2迅速充至
Figure imgf000007_0001
此时 Uci和 11( 2受01箝位， 电 流经 流向 "+" 端。 到 t5状态 4结束， 状态 5开始。
状态 5起始时， 1 导通， 因为此时 UCi=0, 所以 Ti是零电压 导通， 由此开始即重复状态 1。
以上由状态 1开始到状态 4结束为一个周期， 其中 1 和 T2 都是在零电压或接近零电压时进行导通和关断的转换， 从而达到 降低开关损耗的目的。
在以上实施例中， 状态 2的时间间隔， 即死区时间间隔大于 或等于由电感电流对 Ci充电、 C2放电，直到 UC2=0所需的时间； 且状态 4的时间间隔， 即另一个死区时间间隔大于或等于由电感 电流对 Ci放电、 C2充电，直到 UC1=0所需的时间。
由上述可知， 达到零电压转换的关键是图 1 的电路拓朴结构 和死区时间 t3-t2, t5-t4和参数 C, Ci, C2， L和 R的配合。
因此， 本发明所提供的零电压数字功率变换的方法包括以下 步骤： 提供上迷的数字功率变换装置； 由所述零电压转换数字功 率变换器中的各电路参数 d， C2, L, C, R确定各个开关器件 Ti, T2从关断到导通过程中由所述电感 L的电流对与其并联的电 容（^和 c2放电到零的放电时间； 根据上迷确定的放电时间配置 所述控制电路以使得其输出的两个控制电压信号 ϋ Ti和 UT2之间 的死区时间间隔大于或等于相应的所述放电时间 , 从而保证所迷 两个开关器件 1 和 T2在所述开关控制电压的控制下导通和关断 时其端电压为零或接近于零。 如上所述， 在本实施例中， 状态 2 的时间间隔， 即死区时间间隔大于或等于由电感电流对 C i充电、 C2放电，直到 UC2=0所需的时间； 且状态 4的时间间隔， 即另一个 死区时间间隔大于或等于由电感电流对 Qi放电、 C2充电，直到 UC1=0所需的时间。
在上述实施例中， <^和（：2分别为场效应管！^和！^的输出电 容， 且 CfC^
在上述实施例中， 该开关器件 Τι、 Τ2是场效应管。
在上述实施例中， 由于控制信号是任意的， 因此工作过程可 以在非恒定频率下实现零电压转换， 其开关损耗可以降低到小于 5%, 同时， 由于降低了损耗， 可以大大提高开关的频率， 使其工 作的频率范围更宽。 虽然结合上述具体实施例对本发明进行了详细描述， 但是本 领域技术人员应当了解， 在不背离由附后的权利要求书所限定的 发明原理和保护范围内， 还可以对本发明作出各种其他修改、 改 进等。

Claims

权 利 要 求
1、 一种零电压转换数字功率变换器， 其特征在于： 两个分别 与电源连接的开关器件各并联有一电容和反并联一个二极管， 构 成半桥电路的上下臂电路， 并通过一个电感与输出端连接。
2、 根据权利要求 1的零电压转换数字功率变换器， 其特征在 于： 该开关器件是任意开关器件。
3、 根据权利要求 1的零电压数字转换功率变换器， 其特征在 于： 上述两电容相等， 且为各开关器件的输出电容。
4、 根据权利要求 1的零电压转换数字功率变换器， 其特征在 于： 在从两个开关器件都关断的状态开始转换到其中一个开关器 件导通， 另一个开关器件保持关断的状态的间隔时间大于或等于 由电感电流对并联于所述从导通变为关断的开关器件的电容进行 充电、 以及对并联于所述从关断变为导通的开关器件的电容进行 放电直到其端电压等于零所需的时间。
5、 一种应用如权利要求 1-4中任一项所述的零电压转换数字 功率变换器的数字功率变换装置， 其包括：
如权利要求 1-4中任一项所述的零电压转换数字功率变换器； 与所述零电压转换数字功率变换器相连接的控制电路， 该控 制电路的输入端与输入信号相连接， 其两个输出端分别与所述零 电压转换数字功率变换器的开关器件的开关控制端相连接， 用于 为所述开关器件提供开关控制电压；
所迷零电压转换数字功率变换器和所迷控制电路配合工作， 以便所述两个控制电压都为零的死区时间间隔大于或等于由所述 电感电流对并联于相应的从关断变为导通的开关器件的电容放电 至其电压为零的时间， 从而实现当所迷零电压转换数字功率变换 器中的开关器件在导通和关断时的端电压均为零或接近于零。
6、 一种利用如权利要求 5的数字功率变换装置进行零电压数 字功率变换的方法， 其包括以下步骤：
提供如权利要求 5所迷的数字功率变换装置；
由所述零电压转换数字功率变换器中的各电路参数确定各个 开关器件从关断到导通过程中由所述电感电流对与其并联的电容 放电到零的放电时间；
根据上述确定的放电时间配置所述控制电路，以使得其输出 的两个控制电压信号之间的死区时间间隔大于或等于相应的所述 放电时间， 从而保证所述两个开关器件在所述开关控制电压的控 制下导通和关断时其端电压为零或接近于零。
PCT/CN2002/000863 2001-12-03 2002-12-03 Procede de conversion de puissance numerique et dispositif a tension nulle WO2003052915A1 (fr)

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US10/497,436 US7215040B2 (en) 2001-12-03 2002-12-03 Half-bridge converter with zero-voltage switching and snubber
AU2002349471A AU2002349471A1 (en) 2001-12-03 2002-12-03 A digital power converting method and device with zero voltage
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