CN100423437C - Bridge synchronization rectification circuit with dead time adjustment - Google Patents

Bridge synchronization rectification circuit with dead time adjustment Download PDF

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CN100423437C
CN100423437C CN 200410070508 CN200410070508A CN100423437C CN 100423437 C CN100423437 C CN 100423437C CN 200410070508 CN200410070508 CN 200410070508 CN 200410070508 A CN200410070508 A CN 200410070508A CN 100423437 C CN100423437 C CN 100423437C
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connected
unit
dead time
switch
transformer
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CN 200410070508
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CN1731664A (en )
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徐达经
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尼克森微电子股份有限公司
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Abstract

本发明公开了一种具有有死区时间调整的桥式同步整流电路,使用于全桥式或半桥式电源供应器,包括有:一脉冲产生单元输出一脉冲信号;一死区时间控制单元,连接于该脉冲产生单元,接收该脉冲信号,利用该脉冲信号触发一电子开关,同时搭配一RC单元、一比较单元用以输出一死区时间信号;一功率开关驱动切换单元,连接于该死区时间控制单元、该变压器的二次侧的同步绕组及至少一功率开关的控制端,接收该死区时间信号,并于该变压器二次侧的同步绕组取得不同相位切换辅助电源,用以驱动该些功率开关。 The present invention discloses a dead-time adjustment of the bridge synchronous rectification circuit is used in a full bridge or half-bridge power supply, comprising: a pulse generating unit outputs a pulse signal; a dead time control unit, connected to the pulse generating means receives the pulse signal by the pulse signal triggers an electronic switch, while with a RC unit, a comparison unit for outputting a time signal a dead; a power switch driving the switching unit, connected to the dead time a control terminal of the control unit, the synchronization of the secondary side winding of the transformer and at least one power switch, this dead time signal received, and obtain the plurality of driving power switching different phase auxiliary power supply for the synchronous secondary side winding of the transformer switch.

Description

具有死区时间调整的桥式同步整流电路技术领域本发明涉及一种具有死区时间调整的桥式同步整流电路,特别涉及一种使用于全桥式或半桥式电源供应器的具死区时间调整的同歩整流电路。 BACKGROUND bridge synchronous rectification circuit having a dead-time adjustment of the present invention relates to a dead-time adjustment of the bridge synchronous rectification circuit, in particular, it relates to a half-bridge or full bridge power supply having a dead zone ho same time to adjust the rectifier circuit. 背景技术按目前己知的直流电源供应装置,如开关电源中(AC To DC Switching Power Supply)中,为縮小变压器的体积,大多使用高频的脉冲宽度调变(PWM) 控制直流输出电压,如图]所示,为公知半桥式电源供应装置的电路示意图。 BACKGROUND OF THE INVENTION Currently known by the DC power supply device, such as a switching power supply (AC To DC Switching Power Supply) in order to reduce the size of the transformer, is often used in high-frequency pulse width modulation (PWM) control a DC output voltage, such as FIG] shown a circuit diagram of a known half bridge-type power supply device. 变压器T1将电路区分成为一次侧的初级电路101与二次侧的次级电路102,并该一次侧的初级电路101可以通过一脉宽调变控制器1010连接到该二次侧的次级电路102,通过次级电路102电压反馈以调整该一次侧101的Q1、 Q2二个电子开关的占空比(duty cycle)来达到稳定的电压输出。 The transformer T1 primary circuit to distinguish the secondary circuit 102 becomes the primary circuit and the secondary side 101 side, and the primary side of the primary circuit 101 may be connected to the secondary circuit of the secondary side by a PWM controller 1010 102, the secondary voltage circuit 102 to adjust the primary side feedback Q1 101, Q2 of two electronic switches duty ratio (duty cycle) to achieve a stable output voltage. 请配合图l,参考图2,为公知半桥式电源供应装置的电路波形示意图。 FIG Please with L, with reference to FIG. 2, is a schematic circuit diagram of a known half-wave bridge-type power supply device. 脉宽调变控制器1010通过隔离变压器Tr输出控制信号S1-S2,控制信号S卜S2 用以分别控制Q1、 Q2二个电子开关之切换动作。 PWM controller 1010 controlled by an isolation transformer Tr output signals S1-S2, the control signal S2 to control the BU S Q1, Q2 two electronic switches of the switching operation. 利用该二个电子开关Q1、 Q2 的切换动作,将储存于电容器CIO、 C11的电能通过一交连电容CBL分别传送至变压器T1的一侧端,用以形成一交流电源AC。 The use of two electronic switches Q1, Q2 of the switching operation, will be stored in the capacitor CIO, C11 power through a crosslinking capacitor CBL respectively transmitted to one end of the transformer T1, to form an alternating current power source AC. 该交流电源AC用以提供能量给变压器T1,并利用变压器T1将交流电源电压转换到二次侧。 The AC power supply for providing AC power to a transformer T1, a transformer T1 and uses the AC power supply voltage into the secondary side. 变压器T1的二次侧通过一整流单元1020连接到一储能电感L1至输出负载,于Q1、 Q2皆开闭时利用储能电感L1释放能量提供负载所需的电力,同时利用电容器C1作为直流滤波功能。 The secondary side of the transformer T1 is connected through a rectifying unit 1020-1 to the output load inductor L1, on Q1, Q2 are provided using the power required by the load inductor L1 releases the energy when opening and closing, while by the capacitor C1 as a DC filtering. 请参考图2,于时间t0-tl,隔离变压器Tr输出的控制信号S1-S2为正电位, 此时,整流二极管整流D1停止导通,而整流二极管D2维持导通储能电感器L1 开始进行储存能量。 Please refer to FIG. 2, at time t0-tl, the control signal output from the isolation transformer Tr S1-S2 is a positive voltage, this time, the rectifying diode rectifier D1 stops conducting, the rectifier diode D2 is turned on to maintain the energy storage inductor L1 starts store energy. 于时间tl-12,隔离变压器Tr输出的控制信号S1-S2为零电位,此时,储能电感器L1开始进行释放能量,整流二极管D2仍继续导通,此时整流二极管D1亦导通,储能电感器Ll释放能量的路径经由Dl, D2回到储能电感器U。 At time tl-12, a control signal output from the isolation transformer Tr zero potential S1-S2, at this time, the energy storage inductor L1 starts to release energy, the rectifying diode D2 is turned on continues, when the rectifying diode D1 is also turned on, path Ll release of energy storage inductor via Dl, D2 back to the storage inductor U. 于时间t2-13,隔离变压器Tr输出的控制信号S卜S2为负电位,整流二极管D2则停止导通,而整流二极管l)l仍继续导通,储能电感器L1义开始进行储存能量。 At time t2-13, the control signal output from the isolation transformer Tr S Bu S2 is a negative potential, the rectifier diode D2 ceases to conduct, and rectifier diode l) l conduction continues, the energy storage inductor L1 stores energy sense starts. P时间t3-14,隔离变压器Tr输出的控制信号S1-S2为零电位,此时,整流二极管D1仍继续导通,此时整流二极管D2亦导通,储能电感器L1又开始进行释放能量,储能电感器L1释放能量的路径经由D1, D2回到储能电感器L1。 P time t3-14, the control signal output from the isolation transformer Tr zero potential S1-S2, at this time, the rectifying diode D1 is turned on continues, then the rectifier diode D2 is also turned on, the inductor L1, and starts to release energy , the path to release energy storage inductor L1 via D1, D2 back to the energy storage inductor L1. 如此, 在时间t3-t4时又回覆到时间t0-tl时的波形,依序如上述说明。 Thus, at time t3-t4 of time and the time when the reply waveform t0-tl, as sequentially described above. 上述说明中,如图1所不,公知的半桥式电源供应器,其中电子开关Q1、 Q2为金属氧化物半导体场效应晶体管具有小信号控制其0N/0FF作用的幵关元件。 In the above description, FIG. 1 is not known half-bridge power supply, wherein the electronic switches Q1, Q2 is off Jian element metal oxide semiconductor field effect transistor which has a small signal control 0N / 0FF effect. 而整流二极管D1、 D2将交流电压波形转换为直流电压波形,整流二极管D1、 D2于导通时会产生0. 4V-1. 5V不等的电压降(此为二极管的特性),因此当输出电流大时会产生很大的功率损失而发生效率低的缺陷,并因消耗功率过大需要大面积的散热片等问题。 The rectifying diodes D1, D2 AC voltage waveform into a DC voltage waveform, rectifying diodes D1, D2 are turned on at the time of generation 0. 4V-1. 5V voltage drop varies (this is the characteristic of the diode), so when the output inefficient defect occurs will have a great power loss when current is large, and excessive power consumption due to large heat sinks required problems. 发明内容本发明所要解决的技术问题是提供一种具有死区时间调整的桥式同步整流电路,解决现有技术的当输出电流大时会产生很大的功率损失而产生的效率低的问题。 SUMMARY OF THE INVENTION The technical problem to be solved is to provide a dead-time adjustment of the bridge synchronous rectification circuit, to solve the problem of low efficiency produces significant power loss of the prior art when a large output current is generated. 为达到上述目的,本发明提供了一种具有死区时间调整的桥式同步整流电路,连接于一变压器二次侧的同步绕组、至少一功率开关及一储能电感器,其特点在于,包括: 一脉冲产生单元,连接于该变压器二次侧端与该储能电感器一端,根据该变压器二次侧端输出的信号,用以输出一脉冲信号; 一死区时间控制单元包括一电子开关,耦接于该脉冲产生单元,该电子开关受控于该脉冲信号;一RC单元,耦接于该电子开关,该RC单元受控于该电子开关的切换状态, 以输出一锯齿信号; 一比较单元,耦接于该RC单元,该比较单元比较运算该锯齿信号与一参考电压,用以输出一死区时间信号; 一功率开关驱动切换单元, 连接于该死区时间控制单元,该变压器的二次侧的同步绕组及所述功率开关的控制端,接收该死区时间信号,并于该变压器的二次侧的同步 To achieve the above object, the present invention provides a dead time adjustment having a synchronous rectifier bridge circuit connected to a transformer secondary winding of the synchronous side, a power switch and the at least one storage inductor, characterized in that, comprising : a pulse generating unit, connected to the end of the secondary side of the transformer and one end of the storage inductor, the secondary side based on a signal output terminal of the transformer, for outputting a pulse signal; a dead time control means comprises an electronic switch, coupled to the pulse generation unit, the electronic switch controlled by the pulse signal; a RC unit, coupled to the electronic switch, the RC unit is controlled by the switching state of the electronic switch, to output a sawtooth signal; a comparator means, coupled to the RC element, the operation of the comparison unit compares the sawtooth signal and a reference voltage, for outputting a dead time signal; a power switch driving the switching unit, connected to the dead time control unit, the secondary of the transformer winding and the control terminal side of the power switch, this dead time signal reception, and synchronization in the secondary side of the transformer 组取得相位异于二次侧绕组的切换辅助电源,用以驱动所述功率开关。 Group to obtain a phase different from the secondary winding of the auxiliary power switch for driving the power switch. 上述的桥式同歩整流电路,其特点在于,该脉冲信号,由变压器二次侧端输出的信号进行前缘触发取得。 Ho with the above-described bridge rectifier circuit, characterized in that, the pulse signal, the signal output from the secondary side of the transformer is made the leading edge of the trigger. 上述的桥式同步整流电路,其特点在于,该死区时间控制单元,包括:一电子开关,利用一控制端连接于该脉冲产生单元,接收该脉冲信号,用以执行两输出端的导通或截止动作;一RC单元,连接于该储能电感器的另一端与一参考端,是利用一电阻器串接一电容器组成,同时,该电容器并接到该电子开关的两输出端; 一比较单元,具有两输入端及一输出端,其中一输入端连接于该电容器一端,另一端连接到一参考电压,并且该输出端通过一驱动单元连接到该功率开关驱动切换单元。 The above-described bridge synchronous rectification circuit, characterized in that the dead time control unit, comprising: an electronic switch, by means of a control terminal connected to the pulse generating means receives the pulse signal for performing the output of the two turned on or off operation; a RC unit, and the other end connected to the energy storage inductor and a reference terminal, is the use of a series resistor composed of a capacitor, while the capacitor and connected to two output terminals of the electronic switch; a comparison unit having two input terminals and an output terminal, wherein one input terminal is connected to one end of the capacitor, and the other end connected to a reference voltage and the output is connected to the switching unit of the power switch driving by a drive unit. 上述的桥式同步整流电路,其特点在于,该比较单元利用负输入端连接到该电容器一端,利用正输入端连接到该参考电压。 The above-described bridge synchronous rectification circuit, characterized in that the comparison unit using a negative input connected to one end of the capacitor, with a positive input connected to the reference voltage. 上述的桥式同步整流电路,其特点在于,该功率开关驱动切换单元,包括: 一第一驱动单元,连接于该死区时间控制单元、--第一功率开关及该变压器二次侧的同歩绕组,接收该死区时间信号,并于该变压器二次侧的同步绕组取得相位异于二次侧绕组的切换辅助电源,用以驱动该第一功率开关; 一第二驱动单元,连接于该死区时间控制单元、 一第二功率开关及该变压器一次侧的同步绕组,接收该死区时间信号,并于该变压器二次侧的同步绕组取得相位异于二次侧绕组的切换辅助电源,用以驱动该第二功率开关。 The above-described bridge synchronous rectification circuit, characterized in that, the drive switching unit of the power switch, comprising: a first drive unit, connected to the dead time control unit, - ho with the secondary side of the transformer and a first power switch winding, this dead time signal received, and obtaining a phase different from the secondary winding of the secondary winding of the synchronous handover side of the transformer auxiliary power source for driving the first power switch; a second drive unit, connected to the dead zone time control unit, a primary side winding of the synchronous switch and the second power transformers, this dead time signal received, and obtaining a phase different from the secondary winding of the secondary winding of the synchronous handover side of the transformer auxiliary power source for driving the second power switch. 上述的桥式同歩整流电路,其特点在于,该第一驱动单元,包括: 一第-• 切换开关,通过一控制端连接于该死区时间控制单元,并通过一输出端连接到该第一功率开关的控制端; 一第一整流二极管, 一端连接到该变压器二次侧的同步绕组,另一端连接于该第一切换开关的另一输出端。 Ho with the above-described bridge rectifier circuit, characterized in that, the first driving unit, comprising: a first - • switch, via a control terminal connected to the dead time control unit, and connected to the first output terminal through a the control terminal of the power switch; a first rectifier diode having one end connected to the secondary winding of the synchronous side of the transformer, and the other end connected to the other output terminal of the first switch. 上述的桥式同步整流电路,其特点在于,该第二驱动单元,包括: 一第二切换开关,通过一控制端连接于该死区时间控制单元,并通过一输出端连接到该第二功率开关的控制端;-一第二整流二极管, 一端连接到该变压器二次侧的同步绕组,另一端连接于该第二切换开关的另一输出端。 The above-described bridge synchronous rectification circuit, characterized in that, the second driving unit, comprising: a second switch, connected to the dead time control unit via a control terminal and a second power switch connected to the output terminal through a a control terminal; - a second rectifier diode, is connected to one end of the secondary winding of the synchronous side of the transformer, and the other end connected to the other output terminal of the second switch. 上述的桥式同歩整流电路,其特点在于,该第一驱动单元还包括一第一二极管,连接于该死区时间控制单元与该第一功率开关的控制端。 Ho with the above-described bridge rectifier circuit, characterized in that, the first driving unit further comprises a first diode, connected to the dead time control unit and the control terminal of the first power switch. 上述的桥式同步整流电路,其特点在于,该第二驱动单元还包括一第二二极管,连接于该死区时间控制单元与该第二功率开关的控制端。 The above-described bridge synchronous rectification circuit, characterized in that, the second driving unit further comprises a second diode connected to the dead time control of the control unit and the second terminal of the power switch. 上述的桥式同步整流电路,其特点在于,所述第一及第二功率开关为金属氧化物半导体场效应晶体管。 The above-described bridge synchronous rectification circuit, characterized in that the first and second power switch is a metal oxide semiconductor field effect transistor. 6本发明的技术效果在于:本发明的具有死区时间调整的桥式同歩整流电路,是将公知桥式电源供应器使用的整流二极管D1、 D2位置改以金属氧化物半导体场效应晶体管代替,用来降低电路工作时的消耗功率。 A technical effect of the invention is to 6: present invention has a rectifying diode D1 dead time adjustment ho same bridge rectifier circuit, is a well-known power supplies used in the bridge, D2 position changed to a metal oxide semiconductor field effect transistors in place for reducing power consumption during circuit operation. 同时,通过死区时间调整控制电路,用来固定电子开关Q1、 Q2同时截止时的死区时间(Dead Time)。 At the same time, the dead time adjustment control circuit, for fixing electronic switches Q1, Q2 during the dead time while off (Dead Time). 本发明具有死区时间调整的桥式同步整流电路,可以利用调整RC单元的R、 C值,用以调整电路功率开关动作的死区时间,并固定死区时间。 The present invention has a dead-time adjustment of the bridge synchronous rectification circuit, can be used to adjust the RC unit R, C value for the dead time of the switching operation of the power adjusting circuit, and the fixed dead time. 同时,死区时间不会受到脉冲宽度调变控制直流输出电压之占空比不稳定所影响。 At the same time, the dead time is not affected by the pulse width modulation duty cycle to control the DC output voltage is unstable. 下面结合附图进一步详细说明本发明的具体实施例。 Specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings. 附图说明图1为公知半桥式电源供应装置的电路示意图;图2为公知半桥式电源供应装置的电路波形示意图;图3为本发明具死区时间调整的桥式同歩整流电路方框示意图;及图4为本发明波形示意图。 Figure 1 is a schematic circuit diagram of a known half bridge-type power supply device; FIG. 2 is a circuit schematic diagram of a known half-wave bridge-type power supply device; FIG. 3 of the present invention having the dead time adjustment with the bridge rectifier circuit side ho schematic block; and Figure 4 is a waveform diagram invention. 其中,附图标记说明如下: 公知:101 初级电路1010脉宽调变控制器102 次级电路1020 整流单元Ql、 Q2 电子开关Tr隔离变压器Tl变压器S1 — S2控制信号本发明:10同步整流电路TW变压器二次侧的同步绕组Ql、 Q2功率开关Ll 储能电感器102脉冲产生单元104死区时间控制单元1040 RC单元1042 比较单元1044 驱动单元106 功率开关驱动切换单元1062第一驱动单元1064第二驱动单元Tl变压器VREF 参考电压具体实施方式请参考图3,为本发明具死区时间调整的桥式同步整流电路方框示意图。 Wherein reference numerals as follows: well-known: a primary circuit 101 1010 PWM controller 102 of the secondary circuit rectifier unit 1020 Ql, Q2 electronic switch Tl transformer isolation transformer Tr S1 - S2 the control signal according to the present invention: the synchronous rectification circuit 10 TW winding the secondary side of the transformer Ql, Q2 storage inductor Ll of the power switch 102 dead-pulse generating unit 104, the control unit 1040 RC time comparison unit 1044 unit 1042 the power switch driving unit 106 driving a first switching unit 1062 of the second driving unit 1064 the reference voltage VREF transformer Tl driving unit DETAILED DESCRIPTION Referring to FIG 3, a block diagram of the present bridge synchronous rectification circuit having a dead time to adjust to the invention. 本发明的一种具死区时间调整的桥式同步整流电路10,连接于一变压器二次侧的同步绕组TW、 二功率开关Q1、 Q2的控制端及一储能电感器L1,包括有: 一脉冲产生单元102、 一死区时间控制单元104及一功率开关驱动切换单元106。 A bridge circuit for a synchronous rectifier having a dead-time adjustment of the present invention, 10, is connected to a synchronous transformer secondary winding TW, the two power switches Q1, Q2 and a control terminal of the storage inductor L1, comprising: a pulse generating unit 102, a dead time control unit 104, and a power switch driving switching unit 106. 本发明利用脉冲产生单元102连接于该变压器T1 二次侧端与该储能电感器L1一端,根据该变压器T1二次侧端输出的信号进行前缘触发,用以输出一脉冲信号。 The present invention, using a pulse generating unit 102 is connected to a terminal of the secondary side of the transformer T1, the leading edge of the trigger for the storage inductor L1 and one end of the secondary side according to the signal T1 output terminal of the transformer, for outputting a pulse signal. 该脉冲信号被传送到连接于该脉冲产生单元102的该死区时间控制单元104。 The pulse signal is transmitted to the connection to the dead time pulse generating unit 102 control unit 104. 该脉冲信号用来触发死区时间控制单元104中的一电子开关Q4、同时搭配一RC单元1040、 一比较单元1042用以输出一死区时间信号到连接于该死区时间控制单元104的该功率开关驱动切换单元106。 This pulse signal is used to trigger a dead-time control unit 104 switches the electronic Q4, while with a RC unit 1040, a comparison unit 1042 for outputting a signal to the dead time dead time is connected to the control unit 104 of the power switch drive switching unit 106. 该功率开关驱动切换单元106连接于该死区时间控制单元104、该变压器的二次侧的同步绕组TW 及功率开关Q1、 Q2的控制端,接收该死区时间信号,并于该变压器二次侧的同步绕组TW取得相位不同于二次侧绕组的切换辅助电源,用以驱动该功率开关Q1、 Q2。 The power switch 106 is connected to a driving switching unit dead time control unit 104, a power switch Winding TW and the secondary side of the transformer Q1, Q2 of the control terminal, the signal reception dead time, and to the secondary side of the transformer winding TW obtain different phase from the secondary winding of the auxiliary switching power supply for driving the power switches Q1, Q2. 再参考图3,死区时间控制单元104中的电子开关Q4,利用一控制端连接于该脉冲产生单元102,接受该脉冲信号,用以执行二输出端的导通(0N)或截止(OFF)动作。 Referring again to FIG. 3, dead-time control of the electronic switch Q4 unit 104, by using a control terminal connected to the pulse generating unit 102, receiving the pulse signal, to perform a second output terminal of the turned on (0N) is turned off (OFF) action. 同时,死区时间控制单元104中的RC单元1040,连接于该储能电感器Ll的另一端与一参考端G,利用一电阻器RT串接一电容器CT组成,同时,该电容器CT并接到该电子开关Q4的二输出端。 At the same time, dead time control unit 104 RC unit 1040, Ll is connected to the other end of the inductor with a reference terminal G, using a series resistor RT composed of a capacitor CT, and the capacitor CT and then to the second output terminal of the electronic switch Q4. 并,死区时间控制单元104中的比较单元1042,具有二输入端及一输出端,其中一负输入端连接于该电容器CT一端,另一正输入端连接到一参考电压VREF,并该输出端通过一驱动单元1044连接到该功率开关驱动切换单元106。 And the dead time control unit 104 comparison unit 1042, having two input terminals and an output terminal, a negative input terminal of which is connected to one end of the capacitor CT, and the other input connected to a positive reference voltage VREF, and the output terminal is connected to the power switch driving the switching unit 106 by a drive unit 1044. 再参考图3,其中该功率开关驱动切换单元106,由--第一驱动单元1062 与一第二驱动单元1064分别利用一第- -切换开关Q5与一第二切换开关Q6 的控制端连接于该死区时间控制单元104,并通过第一切换开关Q5与第二切换开关Q6的输出端分别连接到该功率开关Ql、 Q2的控制端,以及通过连接于该第一切换开关Q5、该第二切换开关Q6的一第一整流二极管D3与第二整流二极管D4连接到该变压器二次侧的同步绕组TW。 Referring again to FIG. 3, wherein the power switch driving the switching unit 106 by - a first drive unit 1062 and the second drive unit 1064 respectively using a first - - a second switch Q5 and the switching control terminal of the switch Q6 is connected to the dead time control unit 104, through the first switch and a second switch output terminals Q5 and Q6 are connected to the switching of the switch Ql, power, a control terminal Q2, and by connecting to the first switch Q5, the second switch Q6 is a first rectifier diode D3 and the second rectifier diode D4 is connected to the synchronization of the secondary winding side of the transformer TW. 上述说明中,该功率开关驱动切换单元106还有一第一二极管D5、 一第二二极管D6连接于该死区时间控制单元104与第一切换幵关Q5、该第二切换开关Q6的控制端。 In the above description, the switching of the power switch driving unit 106 also has a first diode D5, diode D6 is connected to a second dead time control unit 104 and the first switch OFF Jian Q5, Q6 of the second switch Control terminal. 再有,功率开关Q1、 Q2为金属氧化物半导体场效应晶体管(MOSFET),用来降低电路工作时的消耗功率。 Further, the power switches Q1, Q2 is a metal oxide semiconductor field effect transistor (the MOSFET), is used to reduce power consumption during circuit operation. 以今日科技水准金属氧化物半导体场效应晶体管M0SFET的导通阻抗可以轻易做到10毫欧姆左右的导通电阻值RDS,如FDP3632金属氧化物半导体场效应晶体管为例,可将消耗功率降低甚多以克服使用二极管功率消耗甚多的困扰。 In today's level of technology on-resistance metal oxide semiconductor field effect transistor M0SFET can easily achieve about 10 milliohms the RDS ON resistance, such as a metal oxide semiconductor field effect transistor FDP3632 an example, the power consumption can be reduced very much to overcome the use of diode power consumption very much troubled. 假设输出电压为12Vdc且功率开关Q1、 Q2以FDP3632金属氧化物半导体场效应晶体管(导通电阻值R',s二9毫欧姆、导通电压值Vi,s二100V)取代,输出功率为120W (12V/10A)则功率开关Ql、 Q2的压降为10AX9毫欧姆二90mVdc。 And assuming that the output voltage of 12Vdc power switches Q1, Q2 to FDP3632 metal oxide semiconductor field effect transistor (ON resistance R ', s two milliohms 9, the ON voltage value Vi, s two 100V) substituted, an output power of 120W (12V / 10A) the power switches Ql, Q2 drop 10AX9 milliohms for two 90mVdc. 功率开关Ql、 Q2的消耗功率为90mV X10A二900Mw二0.9W。 Power switches Ql, Q2 of the power consumption is 90mV X10A two 900Mw two 0.9W. 比较图1所示,公知电路中整流二极管Dl、 D2的消耗功率为0. 4X 10A=4W两者相差甚多,输出功率越大越明显。 Comparative shown in FIG. 1, the known circuit rectifying diode Dl, D2, power consumption is 0. 4X 10A = 4W very much difference between the two, the greater the power output significantly. 请参考图4,为本发明波形示意图。 Please refer to FIG. 4, waveform diagram of the present invention. 同时配合图3,本发明利用储能电感L1的输入端取得一电压波形S4,并将电压波形S4送到脉冲产生单元102,脉冲产生单元102执行前缘触发该电压波形S4,以输出一脉冲信号S5。 In conjunction with FIG. 3, the present invention utilizes an input terminal of the inductor L1 to obtain a voltage waveform S4, S4 and the voltage waveform to the pulse generating unit 102, a leading edge pulse generating unit 102 performs the trigger voltage waveform S4, a pulse output signal S5. 该脉冲信号S5被传送到死区时间控制单元104中的电子开关Q4,控制电子开关Q4 导通(ON),以将充电中的RC电路1040进行瞬间放电,用以输出以一锯齿信号S6。 The pulse signal S5 is transmitted to the dead time control of the electronic switches Q4 unit 104, controls the electronic switch Q4 is turned on (the ON), the RC circuit 1040 to be charged in the spark for outputting a sawtooth signal S6. RC电路1040瞬间放电后又开始进行充电动作,并一样RC电路1040 需等到下一个脉冲信号S5出现才能进行瞬间放电,以产生锯齿信号S6。 1040 RC circuit after spark start charging operation, and the RC circuit 1040 as required until the next pulse signal S5 to appear instantaneously discharged to generate a sawtooth signal S6. 再参考图4,配合图3,在死区时间控制单元104中,锯齿信号S6与参考电压VREF利用比较单元1042进行比较运算,用以输出一死区时间信号S7到功率开关驱动切换单元106中第一切换开关Q5与第二切换幵关Q6的控制端, 并于该变压器二次侧的同步绕组TW取得和二次侧绕阻不同相位切换辅助电源,以驱动功率开关Q1、 Q2。 Referring again to FIG. 4, with FIG. 3, the dead-time control unit 104, a sawtooth signal S6 and the reference voltage VREF using the comparing arithmetic comparison unit 1042, for outputting a dead time signal S7 to the power switch driving the switching unit 106 the first a second switching switch Q5 and Q6, Jian oFF control terminal, and acquires the synchronous TW winding side of the transformer secondary winding and the secondary-side switching different phase auxiliary power to drive the power switch Q1, Q2. 如图4所示,变压器二次侧输出电压波形S1为--交变信号,并在变压器二次侧的同歩绕组TW取得不同相位切换辅助电源,第一切换开关Q5与第二切换开关Q6通过一第一整流二极管D3与一第二整流二极管D4分别取得一第一整流波形S2与一第二整流波形S3,同时配合死区时间信号S7进而驱动功率开关Q1、 Q2。 4, the secondary side of the transformer output voltage waveform S1 is - alternating signal, and an auxiliary power switch to obtain different phases in the same winding TW ho the secondary side of the transformer, a first switch and a second switch Q5 Q6 by obtaining a first rectifier diode D3 and a second rectifying diode D4 are respectively a first and a second rectified waveform rectified waveform S2 S3, while with the dead time signal S7 in turn drives power switches Q1, Q2. 再参考图4,上述说明中,当第-整流二极管D3与第二整流二极管D4 f/ 方波时,分别使得第一切换开关Q5与第二切换开关Q6导通(0N)。 Referring again to FIG. 4, the above description, when the first - when the rectifier diode D3 and the second rectifying diode D4 f / square, respectively, such that the first switch and the second switch Q5 Q6 is turned on (0N). 第一整流二极管D3有方波时,使得第一切换开关Q5导通(0N), Q5导通(0N)后对功率开关Q1栅极(GATE)充电使得功率开关Q1导通。 The first well-wave rectifying diode D3, such that the first switch Q5 is turned on (0N), the Q5 is turned on (0N) of the power switch Q1 gate (the GATE) the charging such that the power switch Q1. 第一整流二极管D3方波消失后,功率开关Q1仍继续导通因为功率开关Q1栅极(GATE)尚未放电,此时称栅极自体维持时间,直到死区时间信号S7为低电位时,功率开关Q1方关闭。 After a first square wave rectifying diode D3 disappears, the power switch Q1 is turned on continues as the power switch Q1 gate (the GATE) not discharged, when said gate member is maintained from the time until the dead time signal S7 is low level, the power side switch Q1 is turned off. 第二整流二极管D4有方波时,功率开关Q2导通,其动作时序与开关Q1 相同,必须等死区时间信号S7为低电位时功率开关Q2方关闭。 A second rectifier diode D4 have square wave, the power switch Q2 is turned on, the operation timing which is the same switch Q1, must wait for the dead time signal S7 is low potential side power switch Q2 is turned off. 再参考图4,其中本发明具死区时间调整的桥式同歩整流电路,可以利川调整RC单元的R、 C值来调整锯齿信号S6的斜率。 Referring again to Figure 4, the present invention has a dead-time adjustment of the bridge rectifier circuit with ho, Icheon may adjust R RC units, C to adjust the value of the sawtooth signal slopes S6. 锯齿信号S6比较参考电Jk VBEF,用以整流电路的功率开关Q1、 Q2切换动作时的死区时间。 Comparing the reference sawtooth signal S6 Jk VBEF, the power switch Q1 to the rectifier circuit, the dead time when the switching operation of Q2. 如图4所小功率开关Ql的栅极信号S8与功率开关Q2的栅极信号S9相差一死区时间,并为固定的死区时间。 The power switch gate signal S8 in FIG. 4 switch Ql low power gate signal S9 Q2 differs a dead time, and dead time is fixed. 同时,死区时间不会受到脉冲宽度调变(PWM)控制直流输出电压的占空比(duty cycle)不稳定所影响。 At the same time, the dead time without being affected by the duty cycle of the pulse width modulation (PWM) control a DC output voltage (duty cycle) is unstable. 综上所述,本发明将公知桥式电源供应器使用的整流二极管D1、 D2位置改以金属氧化物半导体场效应晶体管代替,用以降低电路工作时的消耗功率。 In summary, the present invention will be well-known bridge rectifier diode D1 of the power supply used, D2 to change position instead of a metal oxide semiconductor field effect transistor, to reduce power consumption during circuit operation. 同时通过死区时间调整控制电路,用来固定功率开关Q1、 Q2同时截止时的死区时间。 While the dead time adjustment by the control circuit, for a fixed power switches Q1, Q2 dead time when simultaneously turned off. 以上所述仅为本发明的较佳实施例,并非用来限定本发明的实施范围;凡是依本发明所作的等效变化与修改,都被本发明的专利范围所涵盖。 The above are only preferred embodiments of the present invention, not intended to limit the scope of embodiments of the present invention; under this all equivalent modifications and variations made to the invention, is encompassed by the scope of the present invention.

Claims (10)

  1. 1. 一种具有死区时间调整的桥式同步整流电路,连接于一变压器二次侧的同步绕组、至少一功率开关及一储能电感器,其特征在于,包括: 一脉冲产生单元,连接于该变压器二次侧端与该储能电感器一端,根据该变压器二次侧端输出的信号,用以输出一脉冲信号; 一死区时间控制单元,包括: 一电子开关,耦接于该脉冲产生单元,该电子开关受控于该脉冲信号; 一RC单元,耦接于该电子开关,该RC单元受控于该电子开关的切换状态,以输出一锯齿信号; 一比较单元,耦接于该RC单元,该比较单元比较运算该锯齿信号与一参考电压,用以输出一死区时间信号;及一功率开关驱动切换单元,连接于该死区时间控制单元,该变压器的二次侧的同步绕组及所述功率开关的控制端,接收该死区时间信号,并于该变压器的二次侧的同步绕组取得相位异于二次 A dead time adjustment having a synchronous rectifier bridge circuit connected to a transformer secondary winding of the synchronous side, a power switch and the at least one storage inductor, characterized by comprising: a pulse generating unit, connected to end to the secondary side of the transformer and one end of the storage inductor, the secondary side based on a signal output terminal of the transformer, for outputting a pulse signal; a dead time control unit, comprising: an electronic switch coupled to the pulse generating unit, the electronic switch controlled by the pulse signal; a RC unit, coupled to the electronic switch, the RC unit is controlled by the switching state of the electronic switch, to output a sawtooth signal; a comparison unit, coupled to the RC unit, the operation of the comparison unit compares the sawtooth signal and a reference voltage, for outputting a dead time signal; and a power switch driving the switching unit, connected to the dead time control unit, the secondary winding side of the synchronous transformer and a control terminal of the power switch, this dead time signal received, and obtain synchronization in the secondary side winding of the transformer secondary is different from the phase 绕组的切换辅助电源,用以驱动所述功率开关。 Switching the auxiliary power winding, for driving the power switch.
  2. 2、 根据权利要求l所述的桥式同步整流电路,其特征在于,该脉冲信号, 由变压器二次侧端输出的信号进行前缘触发取得。 2. The bridge synchronous rectification circuit according to claim l, wherein the pulse signal, the signal output from the secondary side of the transformer is made the leading edge of the trigger.
  3. 3、 根据权利要求l所述的桥式同步整流电路,其特征在于,该电子开关, 利用一控制端连接于该脉冲产生单元,接收该脉冲信号,用以执行两输出端的导通或截止动作;该RC单元连接于该储能电感器的另一端与一参考端,是利用--电阻器串接一电容器组成,同时,该电容器并接到该电子开关的两输出端; 及该比较单元,具有两输入端及一输出端,其中一输入端连接于该电容器一端,另一端连接到该参考电压,并且该输出端通过一驱动单元连接到该功率开关驱动切换单元。 3, the bridge synchronous rectification circuit according to claim l, characterized in that the electronic switch, by means of a control terminal connected to the pulse generating means receives the pulse signal for performing the output of the two turned on or off operation ; the other end of the RC unit is connected to the energy storage inductor and a reference terminal, is the use of - a resistor connected in series capacitors, at the same time, the capacitor and connected to two output terminals of the electronic switch; and the comparison unit having two input terminals and an output terminal, wherein one input terminal is connected to one end of the capacitor, and the other end connected to the reference voltage and the output is connected to the switching unit of the power switch driving by a drive unit.
  4. 4、 根据权利要求3所述的桥式同步整流电路,其特征在于,该比较单元利用负输入端连接到该电容器一端,利用正输入端连接到该参考电压。 4. The bridge synchronous rectification circuit according to claim 3, wherein the comparing unit using a negative input connected to one end of the capacitor, with a positive input connected to the reference voltage.
  5. 5、 根据权利要求l所述的桥式同步整流电路,其特征在于,该功率开关驱动切换单元,包括:一第一驱动单元,连接于该死区时间控制单元、 一第一功率开关及该变压器二次侧的同步绕组,接收该死区时间信号,并于该变压器二次侧的同步绕组取得相位异于二次侧绕组的切换辅助电源,用以驱动该第一功率开关:及一第二驱动单元,连接于该死区时间控制单元、 一第二功率幵关及该变压器二次侧的同步绕组,接收该死区时间信号,并于该变压器二次侧的同步绕组取得相位异于二次侧绕组的切换辅助电源,用以驱动该第二功率开关。 5. The bridge synchronous rectification circuit according to claim l, wherein the drive switching unit of the power switch, comprising: a first drive unit, connected to the dead time control unit, a first power switch and the transformer winding secondary side, this dead time signal received, and obtaining a phase different from the secondary winding of the secondary winding of the synchronous handover side of the transformer auxiliary power source for driving the first power switch: a second drive and means, connected to the dead time control unit, a synchronous secondary side winding of the second transformer and said power off Jian, this dead time signal received, and obtaining a phase different from the secondary winding to the secondary winding of the synchronous side of the transformer switching the auxiliary power supply, for driving the second power switch.
  6. 6. 根据权利要求5所述的桥式同步整流电路,其特征在于,该第一驱动单元,包括:一第一切换开关,通过一控制端连接于该死区时间控制单元,并通过一输出端连接到该第一功率开关的控制端;及一第--整流二极管, 一端连接到该变压器二次侧的同步绕组,另一端连接于该第一切换开关的另一输出端。 The bridge synchronous rectification circuit according to claim 5, wherein the first driving unit, comprising: a first switch, connected to the dead time control unit via a control terminal and an output terminal through a connected to the control terminal of the first power switch; and a second - rectifier diode, one end of the winding of the transformer connected to the synchronous secondary side, and the other end connected to the other output terminal of the first switch.
  7. 7. 根据权利要求5所述的桥式同步整流电路,其特征在于,该第二驱动单元,包括:--第二切换开关,通过一控制端连接于该死区时间控制单元,并通过一输出端连接到该第二功率开关的控制端;及一第二整流二极管, 一端连接到该变压器二次侧的同步绕组,另一端连接于该第二切换开关的另一输出端。 The bridge synchronous rectification circuit according to claim 5, wherein the second driving unit, comprising: - a second switch, via a control terminal connected to the dead time control unit, and by an output terminal is connected to the control terminal of the second power switch; and a second rectifier diode, is connected to one end of the secondary winding of the synchronous side of the transformer, and the other end connected to the other output terminal of the second switch.
  8. 8. 根据权利要求6所述的桥式同步整流电路,其特征在于,该第一驱动单元还包括一第一二极管,连接于该死区时间控制单元与该第一功率开关的控制端° The bridge synchronous rectification circuit according to claim 6, wherein the first driving unit further comprises a first diode, connected to the dead time control of the control unit and the first terminal ° power switch
  9. 9. 根据权利要求7所述的桥式同步整流电路,其特征在于,该第二驱动单元还包括一第二二极管,连接于该死区时间控制单元与该第二功率开关的控制端。 9. The bridge synchronous rectification circuit according to claim 7, wherein the second driving unit further comprises a second diode connected to the dead time control of the control unit and the second terminal of the power switch.
  10. 10. 根据权利要求7所述的桥式同步整流电路,其特征在于,所述第一及第二功率开关为金属氧化物半导体场效应晶体管。 10. The bridge of the synchronous rectifier circuit according to claim 7, wherein said first and second power switch is a metal oxide semiconductor field effect transistor.
CN 200410070508 2004-08-05 2004-08-05 Bridge synchronization rectification circuit with dead time adjustment CN100423437C (en)

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CN 200410070508 CN100423437C (en) 2004-08-05 2004-08-05 Bridge synchronization rectification circuit with dead time adjustment

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CN101114799B (en) 2006-07-25 2012-07-18 爱博德株式会社 Power supply equipment using half-bridge type circuit
CN102195483B (en) * 2010-03-04 2014-06-04 矽创电子股份有限公司 Dead zone adjusting circuit with coarse adjustment function and fine adjustment function and method

Citations (2)

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Publication number Priority date Publication date Assignee Title
CN2529442Y (en) 2002-01-08 2003-01-01 浙江大学 Synchronous rectification drive circuit of power transformer
US6504739B2 (en) 2001-05-18 2003-01-07 Astec International Limited Simple control circuit for synchronous rectifiers used in ZVS phase shifted full bridge converter

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6504739B2 (en) 2001-05-18 2003-01-07 Astec International Limited Simple control circuit for synchronous rectifiers used in ZVS phase shifted full bridge converter
CN2529442Y (en) 2002-01-08 2003-01-01 浙江大学 Synchronous rectification drive circuit of power transformer

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