CN102723880A - Alternating current-to-direct current circuit - Google Patents

Alternating current-to-direct current circuit Download PDF

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CN102723880A
CN102723880A CN2012101948233A CN201210194823A CN102723880A CN 102723880 A CN102723880 A CN 102723880A CN 2012101948233 A CN2012101948233 A CN 2012101948233A CN 201210194823 A CN201210194823 A CN 201210194823A CN 102723880 A CN102723880 A CN 102723880A
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circuit
voltage
buck
output
value
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CN2012101948233A
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余凤兵
尹向阳
王保均
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广州金升阳科技有限公司
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Publication of CN102723880A publication Critical patent/CN102723880A/en

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Abstract

The invention discloses an alternating current-to-direct current circuit. The circuit comprises a rectification circuit, a BUCK circuit and a voltage detection control circuit, wherein the voltage detection control circuit is provided with a first preset valve used for limiting the lowest work voltage of the BUCK circuit and a second preset valve used for limiting the highest work voltage of the BUCK circuit, and is used for respectively detecting an instantaneous value of pulsating direct current and a voltage value of a low-voltage output end; the voltage detection control circuit outputs a PWM (pulse-width modulation) signal to control the BUCK circuit to work when the instantaneous value of the pulsating direct current is more than the preset vale and less than the second preset valve, and the output voltage Vout of the low voltage output end is less than a third preset value; and when the instantaneous value of the pulsating direct current is more than the second preset value, the voltage detection control circuit controls the BUCK circuit to stop working. The alternating current-to-direct current circuit has the advantages that the BUCK circuit works in a low voltage part of the pulsating direct current by limiting the highest work voltage of the BUCK circuit, so that the efficiency is improved, the circuit does not use high-voltage electrolytic capacitor, and the efficiency is high.

Description

一种交流变直流电路 An AC to DC circuit

技术领域 FIELD

[0001] 本发明涉及交流变直流电路,特别涉及应用于小功率AC/DC电源中的交流变直流电路。 [0001] The present invention relates to AC to DC circuit, and more particularly to low power AC applied to the AC / DC to DC power supply in the circuit.

背景技术 Background technique

[0002] 交流变直流电路很多,用整流电路即可实现。 [0002] AC to DC circuit number, using the rectifier circuit can be realized. 工业与民用供电一般采用交流供电,以民用为例,我国为220VAC/50HZ,美洲采用120VAC或110VAC,频率为60Hz的交流电,而英国采用240VAC/50HZ,其它国家和地区也是各不相同,总体说来,频率为两种:50Hz或60Hz, 工作电压为IlOV左右以及220V左右,其特点是,电压(或电流)的幅度的方向随时间作周期性变化,如图I所示。 General industrial and civil supply AC power to civilian example, China is 220VAC / 50HZ, the Americas using 120VAC or 110VAC, 60Hz frequency alternating current, and the United Kingdom using 240VAC / 50HZ, other countries also vary, generally speaking, to, of two frequency: 50Hz or 60Hz, and the working voltage is about IlOV about 220V, which is characterized by the direction of the amplitude of the voltage (or current) at any time intercropping cyclical changes, as shown I FIG.

[0003] 图I示出的随时间按正弦规律变化的交流电,称为交变正弦电压,变化一次所需要的时间称为交变电压的周期,用T表示,业界所说的220V,是指有效值,其峰值为▲倍有效值,即为: [0003] FIG I shows the variation with time sinusoidally alternating current, an alternating sinusoidal voltage referred to, a time period required referred alternating voltage, is represented by T, said industry 220V, means RMS, peak to rms ▲ times, namely:

[0004] 220Fx^2 =311,!F [0004] 220Fx ^ 2 = 311,! F

[0005] 直流电压(或电流)的大小和方向不随时间变化。 [0005] DC voltage (or current) does not change the magnitude and direction with time. 如用曲线表示电压,则是和水平时间轴平行的一条直线,但我们一般把方向不变,但电压(或电流)的大小随时间有所变化的也称为直流电压(或电流)。 The voltage represented by the curve, and the horizontal axis is parallel to a straight line, but we generally the same direction, but the voltage (or current) vary in size with time is also known as the DC voltage (or current).

[0006] 工业与民用都需要把交流变成直流,首先要使电流单方向流动、即单向导电,然后再将幅度稳定下来,即滤波。 [0006] industrial and civil require the AC into DC, firstly to make a current flow in one direction, i.e., unidirectionally conducting, then the amplitude stabilized, i.e. filtering. 把交流电源变换成单方向电源的过程称为整流。 AC power supply into a single direction is called rectification.

[0007] 把交流电整流成低压直流电,中间要用到变压器,体积大,改变输出电压要改变变压器的匝比,效率也低下,输出端加电容滤波后,最终反映到交流输入端,都是在交流电的正弦波接近顶部时才有工作电流,引起交流电波形崎变。 [0007] The AC voltage to low voltage DC intermediate transformer to use, bulky, to be changed to change the output voltage of the transformer turns ratio, efficiency is low, the capacitor added to the output filter, ultimately reflected in the AC input terminal, are alternating current sine wave only work close to the top, causing the alternating current waveform of distortion.

[0008] 美国专利公开号US2010123448的《C0NTR0LIED ON-TIME BUCK PFC》美国专利公开说明书示出了一种降压式PFC电路,这种电路可以看作是一种交流变成低压直流的电路,按其公开的技术方案,使用了BUCK电路,PWM方式控制BUCK电路中的开关,且在输入脉动直流电峰值时,占空比达到相对最大,这样需要BUCK电路中的电感L的电感量就要很大,且该电感L允许的工作电流也要很大,这样才能确保在高压输入下及占空比相对最大的情况下,该电感不会出现磁饱和,这也就决定了电感L的体积大,绕组的匝与匝、层与层之间的耐压处理增加不少工艺与成本。 [0008] U.S. Patent Publication No. US2010123448 is "C0NTR0LIED ON-TIME BUCK PFC" U.S. Patent Publication shows a buck PFC circuit, this circuit can be seen as a low voltage DC into AC circuit, according to the disclosure of the technical solution, using a BUCK circuit, the PWM control mode BUCK circuit switch, and when the input peak pulsating direct current, the duty factor relative maximum, this requires the inductance L of the circuit inductance will greatly BUCK and the inductance L allows the operating current should be large, so as to ensure that in a relatively high pressure input and duty cycle maximum, the inductor magnetic saturation does not occur, which also determines the size large inductance L, turn and turn of the winding, the voltage withstanding process between the layers and increasing the number of process costs.

[0009] PWM指Pulse Width Modulation,脉冲宽度调变信号,包括定频改变脉冲宽度,和脉冲频率调制(PFM :Pulse Frequency Modulation),以及这两种方式的组合使用,本文所说的PWM,指上述的PWM和PFM以及它们的组合方式PWM-PFM。 [0009] PWM means Pulse Width Modulation, PWM signal, comprising fixed-frequency varying the pulse width, and pulse frequency modulation (PFM: Pulse Frequency Modulation), and use of combination of the two, the PWM mentioned herein, refers to the above-described PWM and PFM and combinations thereof PWM-PFM.

[0010] 常见的BUCK电路用在脉动直流电输入场合下,当输入脉动直流电的电压达峰值时,占空比达到最小,开关损耗大,存在电路效率低,损耗大的缺点。 [0010] BUCK circuit common in the case of pulsating direct current input, when the input voltage of the pulsating direct current peak value, minimum duty cycle, switching loss is large, there is a low efficiency of the circuit, the loss big disadvantage.

[0011] 中国专利申请号201210056555的《一种交流变直流电路》示出了一种用于小功率场合的交流变直流电路,用于3W以上输出功率的场合,也具有电流谐波多,效率较低的缺点。 [0011] Chinese Patent Application No. 201210056555 of "an AC to DC circuit" shows the case for low power AC to DC circuit occasion, for more output power 3W, also having multiple current harmonics, efficiency lower shortcomings.

[0012] 在输出功率小于75W的应用场合,上述的二种方案都存在固有不足,对于用BUCK电路的降压PFC电路,需要用到的电感L的电感量就要很大,体积大,绕组的匝与匝、层与层之间的耐压处理增加不少工艺、成本。 [0012] In applications where the output power is less than 75W of said two kinds of programs there are inherent deficiencies, the buck PFC circuit for the BUCK circuit, L is the inductance of the inductor will need to use a large, bulky, winding voltage withstanding process between the turns and the turns, number of layers increases process cost. 对于上述的《一种交流变直流电路》存在电流谐波多,效率较低的不足。 For the above-described "an AC to DC circuit" exists multiple current harmonics, less than less efficient.

[0013] 注:75W数据来源于中国国家标准GB17625. 1_1998,名为《低压电气及电子设备发出的谐波电流限值(设备每相输入电流< 16A)》。 [0013] Note:. 75W data from China National Standard GB17625 1_1998, called "harmonic current limits voltage electrical and electronic equipments (equipment input current <16A)".

[0014] 对于用BOOST的PFC加DC/DC的两级方案,也存在电路复杂,成本较高的缺点。 [0014] For added PFC DC / DC BOOST with the two solutions, there are also circuit complexity, high cost disadvantages. 而像市面上的集成电路LNK302P为代表的替代线性及电容降压式电源的低成本解决方案,也需要使用高压电解电容,对市电整流后的脉动直流电滤波。 And as integrated circuits typified LNK302P market instead of a linear and a capacitor buck power low-cost solution, but also requires the use of high-voltage capacitor solutions, filtering the pulsating direct current mains rectifier.

发明内容[0015] 有鉴如此,本发明的目的是在输出功率小于75W的应用场合,提供一种交流变直流电路,其BUCK电路不需采用高压电解电容和大体积电感,成本较低,且具有相对高的变换效率。 SUMMARY OF THE INVENTION [0015] In view of this, object of the present invention is less than the output power of 75W applications provided a DC-AC converter circuit that BUCK circuit without using high-voltage capacitor solutions and bulky inductors, low cost, and having a relatively high conversion efficiency.

[0016] 为解决上述技术问题,包括整流电路、电压检测控制电路、BUCK电路;所述的BUCK电路连接在所述的整流电路之后,BUCK电路的输出为所述的交流变直流电路的低压输出端;所述的电压检测控制电路输出PWM信号控制所述的BUCK电路;所述的整流电路输出脉动直流电,所述的电压检测控制电路检测脉动直流电的瞬时值、检测低压输出端电压值,所述的电压检测控制电路按下述要求输出PWM信号控制BUCK电路中开关: [0016] In order to solve the above problems, includes a rectifier circuit, a voltage detection control circuit, BUCK circuit; the BUCK circuit is connected after the rectifying circuit, the output of the BUCK circuit AC to DC voltage output circuit, end; said voltage detecting circuit outputs a control signal to control said PWM BUCK circuit; said rectifier circuit output pulsating direct current, the voltage detection control circuit for detecting an instantaneous value of the pulsating direct current, low voltage output of the voltage detection value, the a voltage detection control circuit described later outputs a PWM signal according to the following requirements switching control circuit BUCK:

[0017] 当所述的整流电路输出脉动直流电的瞬时值高于第一预设值时,所述的电压检测控制电路输出的PWM信号控制所述的BUCK电路工作; [0017] When the output of the rectifier circuit pulsating direct current instantaneous value is higher than a first predetermined value, the voltage detection circuit BUCK PWM control circuit outputs a control signal according to;

[0018] 当所述的整流电路输出脉动直流电的瞬时值高于第二预设值时,所述的电压检测控制电路输出的PWM信号关闭,所述的BUCK电路停止工作; [0018] When the output of the rectifier circuit pulsating direct current instantaneous value is higher than a second predetermined value, the voltage detection control circuit outputs a PWM signal is turned off, the BUCK circuit to stop working;

[0019] 所述的电压检测控制电路检测所述低压输出端电压值,当所述的低压输出端电压值超过第三预设值,所述的电压检测控制电路输出的PWM信号关闭,所述的BUCK电路停止工作。 [0019] The detection of the low value of the voltage output of the voltage detection control circuit, when the low voltage output of the voltage value exceeds a third predetermined value, the voltage detection circuit outputs a PWM signal closes the control of the the BUCK circuit to stop working.

[0020] 让上述方案的可靠的工作,所述的第二预设值的电压高于所述的第一预设值电压; [0020] so that the reliable operation of the above-described embodiment, the second voltage is higher than a preset value of the voltage of the first predetermined value;

[0021] 作为上述技术方案的改进,所述的第二预设值的电压随着所述的低压输出端电压纹波而变化,所述的低压输出端电压纹波变大时,所述的第二预设值的电压由所述的电压检测控制电路自动升高;所述的第一预设值的电压随着所述的低压输出端电压纹波而变化,所述的低压输出端电压纹波变大时,所述的第一预设值的电压由所述的电压检测控制电路自动降低。 [0021] As an improvement of the above-described aspect, the voltage of the second preset value as the low voltage output of the voltage ripple is changed, when the low voltage output of the voltage ripple is increased, the voltage is increased by a second predetermined value of the voltage detection control circuit automatically; a voltage of a first predetermined value as said output terminal of said low voltage ripple voltage changes, the output voltage of the low-pressure when the ripple becomes large, the voltage of the first preset value is automatically reduced by the voltage detection control circuit.

[0022] 所述整流电路的输出端和所述的BUCK电路中间并联电容,所述的电容容量在IuF以下。 [0022] The output terminal of the rectifier circuit and the BUCK intermediate circuit capacitor connected in parallel, the capacitance in IuF less.

[0023] 本发明的工作原理为: [0023] The working principle of the present invention are:

[0024] 上述连接关系的交流变直流电路,整流后脉动直流电的瞬时值较高时,高于第二预设值时,BUCK电路不工作,BUCK电路工作在脉动直流电的瞬时值高于低压输出端的一段时间范围内,这时由于BUCK电路的工作电压不高(与整流后脉动直流电的峰值相比),BUCK电路的占空比可以做得较大,如在O. 99至O. I之间,变换效率容易做得很闻,而当整流后脉动直流电的瞬时值较高时(高于第二预设值),BUCK电路已不工作,这时BUCK电路中的电感不承受瞬时高压,该电感可以做得较小,瞬时高压全部由BUCK电路中的开关器件(一般为MOS管)在截止状态下承担,BUCK电路中的开关管在截止状态下,其承受的应力也大幅度提升。 AC [0024] The connection relationship to DC circuit, higher rectified pulsating direct current instantaneous value is higher than the second predetermined value, BUCK circuit does not work, in the BUCK circuit than the instantaneous value of the pulsating direct current voltage output end of a period of time range, then since the BUCK circuit operating voltage is not high (as compared to the peak rectified pulsating direct current), the duty ratio BUCK circuit can be made large, as in the O. 99 O. I to between, the conversion efficiency is very easy to make the smell, and when the instantaneous value of the rectified pulsating direct current is high (higher than the second predetermined value), BUCK circuit is no longer working, then the BUCK circuit inductance is not subjected to high voltage transients, the inductor can be made smaller, all by high voltage transients BUCK circuit switching device (typically a MOS tube) in the oFF state, BUCK circuit switch in the oFF state, the stress which is also improved significantly.

[0025] 在整流电路的输出端和BUCK电路中间并联电容,可以让BUCK开关时产生的高频开关电流的包络清晰,电容容量在IuF以下,可以对BUCK开关时产生的高频开关电流滤波,提高本发明的EMI性能。 [0025] The parallel capacitance intermediate circuit and the output terminal of the rectifying circuit BUCK, allow high frequency switching current generated when the switch envelope BUCK clear, high-frequency switching in the filter capacitance current IuF less, generated when the switch can BUCK , the present invention is to improve EMI performance.

[0026] 与现有技术相比,本发明具有以下有益效果: [0026] Compared with the prior art, the present invention has the following advantages:

[0027] 综上分析,由于本发明中的BUCK电路只在交流电的峰值以下的一段区间工作,在小于75W的小功率电源中,没有使用滤波的高压电解电容,在首次开机上电、开机时没有冲击电流;BUCK电路中的开关器件承受:的电应力也降低;提闻了开关器件的占空比,从而提高了变换效率;只使用了一级开关电源,电路简单,成本低。 [0027] To sum up, since in the present invention BUCK circuit only for some sections work in alternating current peak or less, in low power supply of less than 75W is not used the filtered high voltage capacitor solutions, when the first turn on the power, power no inrush current; BUCK circuit switching device subjected to: the electric stress is reduced; smell mention duty ratio of the switching device, thereby improving the conversion efficiency; only one of the switching power supply, the circuit is simple, and low cost.

[0028] 由于只在输出端使用较大容量的滤波电容,其它电路容易贴片生产,容易小型化、模块化。 [0028] Since only the use of larger capacity filter capacitor at the output, the other circuit chip production is easy, easy small, modular.

附图说明 BRIEF DESCRIPTION

[0029] 图I为随时间按正弦规律变化的交流电波形图; [0029] Figure I is a waveform diagram showing an alternating current sinusoidally with time change;

[0030] 图2为根据技术方案中绘制出来的原理框图;也是第一实施例的电路图; [0030] FIG. 2 is a block diagram drawn according to the aspect; is a circuit diagram of a first embodiment;

[0031] 图3为整流电路101输出的脉动直流电图形; [0031] FIG. 3 is a graphical rectified pulsating DC output from the circuit 101;

[0032] 图4为本发明第一实施例的工作区间、电流包络、输出纹波示意图; [0032] FIG 4 the working region of the first embodiment of the present invention, the current envelope, the output ripple schematic;

[0033] 图5为本发明第一实施例实测输出纹波图; [0033] Figure 5 measured output ripple of the first embodiment of the present invention, FIG;

[0034] 图6为本发明第二实施例电路图; [0034] Figure 6 a circuit diagram of a second embodiment of the present invention;

[0035] 图7为本发明第三实施例电路图; [0035] Figure 7 a circuit diagram of a third embodiment of the present invention;

[0036] 图8为本发明第三实施例的另一种应用电路图; [0036] FIG. 8 is a circuit diagram of another application of the third embodiment of the invention;

[0037] 图9为本发明第四实施例电路图; [0037] Figure 9 a circuit diagram of a fourth embodiment of the present invention;

[0038] 图10-1为本发明第四实施例的工作区间示意图; [0038] FIG. 10-1 workspace fourth embodiment of a schematic embodiment of the present invention;

[0039] 图10-2为本发明第四实施例的电流包络示意图; [0039] FIG. 10-2 envelope of the current embodiment of the fourth embodiment of the present invention, a schematic diagram;

[0040] 图10-3为本发明第四实施例的输出纹波示意图; [0040] FIG. 10-3 output ripple present embodiment of the invention, a schematic view of a fourth embodiment;

[0041] 图11为本发明第五实施例电路图。 [0041] Figure 11 a circuit diagram of a fifth embodiment of the present invention.

具体实施方式 Detailed ways

[0042] 第一实施例 [0042] First embodiment

[0043] 图2示出了本发明第一实施例的原理框图,交流变直流电路包括整流电路101、电压检测控制电路102、BUCK电路103组成。 [0043] FIG. 2 shows a block diagram of a first embodiment of the present invention, the AC to DC circuit 101 includes a rectifier circuit, a voltage detection control circuit 102, BUCK circuit 103 components.

[0044] 整流电路101将输入的交流电整流,输出脉动直流电,参见图3,横轴为时间轴,T表示输入交流电的周期,纵轴为脉动直流电的瞬时电压值;电压检测控制电路102通过端口201和端口202检测脉动直流电的瞬时值,同时通过端口204检测低压输出端的输出电压Vout,同时通过端口203输出PWM信号控制BUCK电路103中开关Ql ;开关Ql通常为一只MOS管。 [0044] The rectifying circuit rectifying the alternating current input 101, the output pulsating direct current, see FIG. 3, the horizontal axis is the time axis, T is the period of the AC input, the vertical axis represents the instantaneous value of the pulsating direct current voltage; and a voltage detection control circuit 102 through a port 201 and 202 detects the instantaneous value of the pulsating direct current port, through the low pressure port 204 detects an output voltage Vout of the output terminal, while the BUCK circuit by the control port 203 outputs a PWM signal 103, the switch Ql; Ql typically a switch MOS transistor.

[0045] BUCK电路103连接在整流电路101之后,BUCK电路103包括开关Ql、电感L,续流二极管D1,以及输出滤波电容C,BUCK电路103的基本电路拓扑是公知技术,这里不再赘述。 [0045] BUCK circuit 103 is connected after the rectifier circuit 101, BUCK circuit 103 includes a switch Ql,, inductor L, the freewheeling diode D1, and an output filter capacitor C, the basic circuit topology BUCK circuit 103 are well known art and will not be repeated here. BUCK电路的输入端连接至整流电路101的输出端,即整流电路101的输出脉动直流电就是BUCK电路103的工作电压,BUCK电路103的输出为本交流变直流电路的低压输出端Vout ; BUCK circuit outputs a pulsating input connected to the output terminal of the rectifier circuit 101, i.e., the rectifying circuit 101 is a DC operating voltage BUCK circuit 103, an output circuit 103 of the present BUCK AC to low-voltage output terminal Vout of the DC circuit;

[0046] 电压检测控制电路102设置有用于限制BUCK电路103最大工作电压的第二预设值,以及用于限制BUCK电路103工作下限的第一预设值,和用于限制BUCK电路103最大输出电压的第三预设值,电压检测控制电路102的PWM信号输出端连接到BUCK电路的工作控制端,即电压检测控制电路102通过端口203输出PWM信号控制所述的BUCK电路中的开关Ql,当整流电路101输出脉动直流电的瞬时值在第一预设值以上、第二预设值以下且低压输出端输出电压Vout低于第三预设值时,电压检测控制电路102才输出PWM信号控制BUCK电路103工作,BUCK电路103输出经电容C滤波后得到低压直流电;当整流电路101输出脉动直流电的瞬时值高于第二预设值时,电压检测控制电路102通过端口203输出的PWM信号关闭,BUCK电路103中的开关Ql停止工作,即BUCK电路中开关Ql处于断开状态,这时BUCK电路103不工作,电容C储能 [0046] The voltage detection control circuit 102 is provided with a second preset value BUCK circuit 103 for limiting the maximum operating voltage, and means for limiting the lower limit of the BUCK circuit 103 operates a first predetermined value, and means for limiting the maximum output circuit 103 BUCK the third predetermined value of the voltage, the PWM signal output of the voltage detection control circuit 102 is connected to the control terminal BUCK operation of the circuit, i.e. the voltage detection control circuit 102 via the switch Ql, BUCK circuit 203 outputs a PWM signal to control the port in, when the pulse rectifier circuit 101 outputs a direct current instantaneous value is above a first predetermined value, the second predetermined value and low-voltage output terminal of the output voltage Vout is lower than a third predetermined value, the voltage detection control circuit 102 outputs a PWM signal to control only BUCK circuit 103 operates, the output filtering capacitor C 103 BUCK obtained low-voltage DC circuit; when the pulse rectifier circuit 101 outputs a direct current instantaneous value is higher than the second predetermined value, the voltage detection control circuit 102 is closed by a PWM signal output from the port 203 , the switch Ql BUCK circuit 103 is stopped, i.e., BUCK circuit switch Ql is in an off state, BUCK circuit 103 does not operate at this time, the storage capacitor C 输出端负载放电;低压输出端Vout电压高于对应的第三预设值时,电压检测电路102也关闭BUCK电路103,即BUCK电路103中开关Ql处于断开状态,以防输出电压Vout超过设定的第三预设值。 Discharging the output load; low-voltage output terminal Vout when the voltage is higher than a third predetermined value corresponding to the voltage detection circuit 102 also closes BUCK circuit 103, i.e., the switch Ql BUCK circuit 103 in the off state, to prevent the output voltage Vout exceeds the set the third set of preset values.

[0047] 下面以一组实测数据说明本发明的第一实施例,设计输出功率为12V/6W。 [0047] In the following a set of measured data, a first embodiment of the present invention is designed to output 12V / 6W. 整流电路101由4只1N5406整流二极管组成,接成桥式整流电路,BUCK电路103包括开关Q1、续流二极管Dl和电感L和电容C,开关Ql选用MOS管,型号为英飞凌科技公司的MOS管SPU03N60C,其漏极电流为3A,耐压为600V,端口203输出的PWM信号经过隔离变压器驱动MOS管Ql的栅极,为了简化电路,本文中一律用箭头指向开关或指向MOS管的栅极表示这种隔离驱动,用公知的自举方式也可以实现这种“隔离”驱动。 Rectifying circuit 101 by the four 1N5406 rectifier diode, connected to a bridge rectifier circuit, BUCK circuit 103 includes a switch Q1, and a freewheeling diode Dl inductance L and capacitance C, selection switch MOS transistor Ql, Infineon model MOS transistor SPU03N60C, its drain current. 3A, a withstand voltage of 600V, PWM signal output from the port 203 through the isolation transformer in the gate of the driving MOS transistor Ql, in order to simplify the circuit, with the arrow pointing herein always point MOS transistor switch or gate this represents a very isolated driver, a known bootstrapping can also be achieved this way "isolation" drive. MOS管Ql的漏极接整流电路101的输出正,MOS管Ql的源极接续流二极管Dl的阴极,续流二极管Dl的阳极接整流电路101的输出负,MOS管Ql的源极和续流二极管Dl的阴极的连接点还连接电感L,输出滤波电容C和电感L连接,滤波电容C另一端连接整流电路101的输出负。 Ql output MOS transistor having a drain connected to a positive rectifier circuit 101, the source electrode of the MOS transistor Ql spliced ​​stream cathode of the diode Dl, and an anode connected to the negative output of the rectifier circuit freewheeling diode Dl 101, a source electrode of the MOS transistor Ql and freewheeling a cathode connection point of the diode Dl is also connected to the negative output L, the output filter capacitor C and the inductance L is connected, a filter capacitor C connected to the other end of the inductor 101 of the rectifier circuit.

[0048] 低压输出端Vout为12V,那么第一预设值取为12VX1.05=12.6V以上,这里取13V作为第一预设值;考虑到MOS管Ql的最小占空比D低于0. 05以下后,电路的效率很低,这里取最小占空比D为0. I,那么利用BUCK电路的输出电压计算公式: [0048] The low-voltage output terminal Vout is 12V, then the first predetermined value or more is taken as 12VX1.05 = 12.6V, 13V taken herein as a first predetermined value; Ql considering the MOS transistor is lower than the minimum duty ratio D 0 after 05 or less, the low efficiency of the circuit, where the minimum duty ratio D is taken 0. I, then the BUCK circuit by using the output voltage of the formula:

[0049] Uvout=DUin...............................................................公式(I) [0049] Uvout = DUin ............................................ ................... formula (I)

[0050] 公式(I)中,Uvout为低压输出端Vout电压,D为占空比,Uin为整流电路101输出脉动直流电瞬时值。 [0050] Formula (I) wherein, Uvout low voltage output terminal Vout voltage, D is the duty cycle, Uin rectifier circuit 101 outputs the instantaneous value of the pulsating direct current. 可以算出第二预设值为120V。 The second predetermined value may be calculated 120V.

[0051] 第三预设值定为12. 85V。 [0051] The third preset value as 12. 85V.

[0052] 电压检测控制电路102可由安森美公司型号为UC2843A的PWM控制器和两片TL431三端可调分流基准源以及其它器件组成,上述电压检测控制电路102的端口201、端口202、端口203和端口204所实现的电压检测、PWM控制信号输出功能,均可由该电路实现,该电路的具体电路连接和原理均属公知技术范畴,在此不再一一说明。 [0052] The voltage detection control circuit 102 may be ON Semiconductor type adjustable shunt reference source and other devices consisting UC2843A PWM controller TL431 and two three-terminal, the voltage detection control circuit 102 of port 201, port 202, port 203 and a voltage detector implemented port 204, the PWM control signal output, can be realized by the circuit, particularly a circuit connected to the circuit and principles belong to the known art areas, not going to be described herein. 该电压检测控制电路102的开关频率为52KHz。 The voltage detecting circuit 102 controls the switching frequency of 52KHz. 那么电感L为IOOuH的功率电感,电容C为2200uF/16V的电解电容。 IOOuH then L is the inductance of a power inductor, the capacitance C of electrolytic capacitor 2200uF / 16V is.

[0053] 实测性能如下表一: [0053] a measured performance in the following table:

[0054]表一 [0054] Table I

[0055] [0055]

输出电压 12V 12V output voltage

输出电流 05A Output Current 05A

满载输出纹波(峰-峰值) 1.69V 效率 81.4% Full output ripple (peak - peak) 1.69V efficiency 81.4%

交流输入端最大峰值电流2. 37A Maximum peak current AC input 2. 37A

[0056] 图4示出了电源行业常用的波形图,其中T为20mS,对应我国的50Hz交流电,301为整流电路101的输出脉动直流电压;302为本发明第一实施例中的BUCK电路103的工作区间;303为本发明第一实施例中BUCK电路103的输入端工作电流的包络图;304为本发明第一实施例中BUCK电路103的输出端电容C两端的纹波电压图;图5示出了本发明第一实施例实测的输出端电容C两端的纹波电压图。 [0056] FIG. 4 shows a waveform diagram of the conventional power industry, where T is 20mS, corresponding to our 50Hz AC, the output 301 of the pulsating DC voltage of the rectifier circuit 101; 302 BUCK circuit of a first embodiment of the present embodiment of the invention 103 the working interval; an input terminal 303 of the present embodiment, the operating current of 103 BUCK circuit diagram of a first embodiment of the invention the envelope; 103 C output terminal of the capacitor ripple voltage across the BUCK circuit diagram of a first embodiment 304 of the present invention; Figure 5 shows the output of the ripple voltage across capacitor C of a first embodiment of the present invention is measured. 示波器型号:泰克TDS-3012C数字荧光示波器,负载使用了电子负载,型号为IT8511,电流设定在0. 5A上。 Oscilloscope Model: Tektronix TDS-3012C Digital Phosphor Oscilloscope, an electronic load and load, model IT8511, in the current setting 0. 5A. 图5的波形和图4中的304是完全一致的。 304 in FIG. 4 and FIG. 5 is a waveform completely identical.

[0057] 显而易见,让电路在负载轻载时,BUCK电路工作在第一预设值20V至第二预设值60V之间,而在电路在负载满载时,BUCK电路工作在第一预设值13V至第二预设值120V之间,有利于更进一步变换提高效率,电压检测控制电路102只要对输出电压Vout的纹波电压进行检测,即可实现这一功能,即BUCK工作区间随输出纹波自动调整工作区间。 [0057] Obviously, when the circuit is so low load, BUCK circuit between the first predetermined value to a second predetermined value 20V 60V, while at full load, BUCK circuit in a first preset value circuit the second predetermined value between 13V to 120V, is conducive to further improve the conversion efficiency, the voltage detection control circuit 102 as long as the ripple voltage of output voltage Vout is detected, this function can be realized, i.e. the working region with the output pattern BUCK waves to automatically adjust the work area.

[0058] 若采用背景技术中美国专利公开号2010123448的《C0NTR0LIED ON-TIME BUCKPFC))示出的一种控制导通时间降压式PFC电路,设计成同样的输出12V/6W的电路,其在交流输入峰值31IV时的占空比D为: [0058] The use of a background art of U.S. Patent Publication No. 2010123448 "C0NTR0LIED ON-TIME BUCKPFC)) shows a method of controlling the conduction time of the buck PFC circuit, the same circuit is designed to output 12V / 6W, which in when the duty ratio D of the peak line 31IV:

[0059] D = = ^7 = 0.0386..........................................公式⑵ [0059] D = = ^ 7 = 0.0386 ........................................ .. ⑵ formula

Uin 311 Uin 311

[0060] 这个占空比为其最大占空比,在交流输入瞬时值比峰值311V小的其它时间里,其占空比D远比上述的0. 0386要小,对于本技术领域的技术人员来说,占空比小于0. 05,电路的变换效率在同成本下无法做好是公知常知。 [0060] The duty cycle is at its maximum duty cycle, the instantaneous value of the input AC 311V smaller than the peak time of the other, which is far above the duty ratio D is smaller .0386, for those skilled in the art , a duty cycle of less than 0.05, the conversion efficiency of the circuit at the same cost do not normally known art. 美国专利公开号US2010123448适合制作输出电压较高的电路,如输出200V,那么最大占空比为0. 64,电路才有可行性。 U.S. Patent Publication No. US2010123448 for higher production output voltage of the circuit, such as 200V output, then the maximum duty cycle of 0.64, only feasibility circuit.

[0061] 常见的BUCK电路用在脉动直流电输入场合下,当输入脉动直流电达峰值31IV时,占空比达到最小,式⑵的计算结果,这时开关损耗大,存在电路效率低,损耗大的缺点。 [0061] BUCK circuit common at a pulsating DC input case, when a peak of the input pulsating direct current 31IV, the duty cycle reaches the minimum calculation formula ⑵, then large switching losses, there is a low efficiency of the circuit, a large loss shortcomings. 和上述的美国专利公开号US2010123448 —样,MOS管都要使用耐压600V以上的MOS管,这样才能保证最终产品在浪涌、防雷方面符合要求,事实上,想做成完成符合安规的产品,由于MOS管在交流输入大部份时间里都是工作的,必需使用耐压900V的MOS管,而本发明第一实施例的电路,在输入电压瞬时值120V以上时,MOS管Ql是不工作的,晶体管在截止时其承受的电应力是导通状态下的2至10倍,所以本发明第一实施例中的MOS管可以选用耐压相对低的晶体管,这样同样的价格,可以选用导通内阻低的MOS管,提升本发明电路的变换效率。 And the aforementioned US Patent Publication No. US2010123448 - like, MOS tube have to use more pressure 600V MOS tube, so as to ensure that the final product meets the requirements of the surge, lightning protection aspects, in fact, trying to do a complete compliance with safety regulations product, since the MOS transistors are operating in most of the time AC input, 900V is necessary withstand voltage MOS transistor, and a first circuit embodiment of the embodiment of the present invention, when the instantaneous value of input voltage than 120V, a MOS transistor Ql does not work, electrical stress when the transistor is turned off it is subjected to 2 to 10 times in the oN state, the MOS transistor of the first embodiment embodiment of the present invention can use a relatively low voltage transistors, so the same price may be selection of low conduction resistance MOS transistor, to enhance the conversion efficiency of the circuit of the present invention.

[0062] 而中国专利申请号201210056555的《一种交流变直流电路》示出了一种用于小功率场合的交流变直流电路,采用其申请书中图17的电路,为了方便三极管选型,电路中NPN型都换成PNP型的,PNP型都换成NPN型的,设计成输出12V/6W的电路,输出电容仍用2200uF/16V电容,实测性能如下表二: [0062] The Chinese Patent Application No. 201210056555 of "an AC to DC circuit" shows a method for low power AC to DC circuit occasion, the circuit of Figure 17 uses its application in order to facilitate the selection transistor, NPN type circuit are replaced by PNP type and NPN type PNP-type are replaced, the circuitry is designed to 12V / 6W output, with the output capacitance is still 2200uF / 16V capacitors, the measured performance in the following table II:

[0063]表二 [0063] Table II

[0064] [0064]

Figure CN102723880AD00081

[0065] 为了获得表二的性能,TR25a选用了MJE13003三极管,而TR25b选用了最大集电极电流高达12A,耐压400V的3DD13009这种大功率三极管,且采用了5只并联,才保证了表二中64. 2%的效率,很明显,纹波和效率都不如表二中的数据。 [0065] In order to obtain performance table II, TR25a MJE13003 selected transistor, while the collector current TR25b up to the maximum selected. 12A, the withstand voltage of 400V 3DD13009 this power transistor, and the use of five parallel, only to ensure the Table II in 64.2% efficiency, obviously, are not as efficient, and the ripple data in table II. 由于申请号201210056555的电路,是在输入脉动直流电比12V输出电压略高时瞬间导通,导通的持续时间实测为96uS,导通时的峰值电流很大,实测高达28. 6A。 Application No. 201 210 056 555 since the circuit is in the input pulsating direct current conduction is slightly higher than the instantaneous output voltage of 12V, the duration of the conduction was found to be 96uS, peak current conducting large, found up to 28. 6A.

[0066] 显而易见,本发明确实在75W以下小功率场合,可以实现前文所述的有益效果。 [0066] Obviously, the present invention is indeed the case in the low power 75W or less, advantageous effects can be achieved as previously described.

[0067] 第二实施例 [0067] Second Embodiment

[0068] 图6为本发明第二实施例的原理图,第二实施例的交流变直流电路包括整流电路 [0068] FIG. 6 is a schematic diagram of the second embodiment of the present invention, the second embodiment of the AC to DC circuit includes a rectifier circuit

101、电压检测控制电路102、BUCK电路103组成;其在实施例一的基础上,将BUCK电路中的续流二极管Dl更换为一只N沟道的MOS管Q2,MOS管Q2在这里起续流的作用,功能和续流二极管Dl相同,因为改为和续流二极管Dl同步导通的MOS管,导通压降低,这样整机的变 101, a voltage detection control circuit 102, BUCK circuit 103 consisting of; an embodiment which is based on the embodiment, the freewheeling diodes Dl BUCK circuit is replaced with an N MOS channel transistor Q2, the MOS transistor Q2 continued from here flow action, and freewheeling diode Dl functions the same as a freewheeling diode Dl and to the synchronization of the MOS transistor is turned on, the pressure reduction is turned on, so that the machine becomes

换效率高。 High conversion efficiency.

[0069] 整流电路101将输入的交流电整流,输出脉动直流电,参见图3 ;电压检测控制电路102通过端口201和端口202检测脉动直流电的瞬时值,同时通过端口204检测低压输出端的输出电压Vout,同时通过端口203输出PWM信号控制BUCK电路103中开关Ql ;通常为一只MOS管;电压检测控制电路102同时通过端口205输出PWM信号控制BUCK电路103中开关Q2,实现同步整流功能。 [0069] AC rectified by the rectifier circuit 101 is input, the output pulsating direct current, see FIG. 3; the voltage detection control circuit 102 through the port 201 202 detects pulsation and port direct current instantaneous value, while the output voltage 204 detects the voltage output terminal port Vout of, while port 203 controlled by a PWM signal output circuit 103 switches Ql, BUCK; typically an MOS transistor; a voltage detection control circuit 102 while the switch Q2 via port 103 outputs a PWM signal 205 BUCK control circuit, synchronous rectification.

[0070] BUCK电路103连接在整流电路101之后,接收整流电路101输出的脉动直流电,它们中间加入吸收高频开关电流的电容Cl,取值为104/630V,BUCK电路103的输出为本交流变直流电路的低压输出端Vout ; [0070] BUCK circuit 103 is connected after the rectifier circuit 101, receiver 101 outputs pulsating direct current rectifier circuit therebetween added capacitance Cl of absorbing high frequency switching current value of 104 / 630V, the output circuit 103 of the present BUCK AC converter low voltage Vout of the output terminal of the DC circuit;

[0071] 电压检测控制电路102设置有用于限制BUCK电路103最大工作电压的第二预设值,以及用于限制BUCK电路103工作下限的第一预设值,和用于限制BUCK电路103最大输出电压的第三预设值;电压检测控制电路102的PWM信号输出端连接到BUCK电路的工作控制端,即电压检测控制电路102通过端口203、205输出PWM信号控制所述的BUCK电路中的开关Q1、开关Q2,当整流电路101输出脉动直流电的瞬时值在第一预设值以上、第二预设值以下且低压输出端输出电压Vout低于第三预设值时,才输出PWM信号控制BUCK电路103工作,BUCK电路103输出经电容C滤波后得到低压直流电;当整流电路101输出脉动直流电的瞬时值高于第二预设值时,电压检测控制电路102通过端口203输出的PWM信号关闭,BUCK电路103中的开关Ql停止工作,即BUCK电路中开关Ql处于断开状态,这时BUCK电路103不工作,电容C储能向输出 [0071] The voltage detection control circuit 102 is provided with a second preset value BUCK circuit 103 for limiting the maximum operating voltage, and means for limiting the lower limit of the BUCK circuit 103 operates a first predetermined value, and means for limiting the maximum output circuit 103 BUCK the third predetermined value of the voltage; BUCK circuit PWM signal output of the voltage detection control circuit 102 is connected to the control terminal BUCK operation of the circuit, i.e. the voltage detection control circuit 102 through a port 203, 205 outputs a PWM signal for controlling the switch in the Q1, the switch Q2, when the pulse rectifier circuit 101 outputs a direct current instantaneous value is above a first predetermined value, the second predetermined value and low-voltage output terminal of the output voltage Vout is lower than a third predetermined value, it outputs a PWM control signal BUCK circuit 103 operates, the output filtering capacitor C 103 BUCK obtained low-voltage DC circuit; when the pulse rectifier circuit 101 outputs a direct current instantaneous value is higher than the second predetermined value, the voltage detection control circuit 102 is closed by a PWM signal output from the port 203 , the switch Ql BUCK circuit 103 is stopped, i.e., BUCK circuit switch Ql is in an off state, BUCK circuit 103 does not operate at this time, the output storage capacitor C 端负载放电;低压输出端Vout电压高于对应的第三预设值时,电压检测电路102也控制关闭BUCK电路103,即BUCK电路103中开关Ql处于断开状态,以防输出电压Vout超过设定的第三预设值。 Load discharge end; voltage output terminal Vout when the voltage is higher than a third predetermined value corresponding to the voltage detection circuit 102 also controls the closing BUCK circuit 103, i.e., the switch Ql BUCK circuit 103 in the off state, to prevent the output voltage Vout exceeds the set the third set of preset values.

[0072] 下面以一组实测数据说明本发明的第二实施例,设计输出功率为24V/12W。 [0072] The following set of measured data to a second embodiment of the present invention, the design output power of 24V / 12W. 整流电路101由4只1N5406整流二极管组成,接成桥式整流电路,BUCK电路103包括开关Q1、MOS管Q2和电感L,开关Ql型号为英飞凌科技公司的MOS管SPU03N60C,其漏极电流为3A, 耐压为600V,MOS管Q2为VISHAY公司的SI7450,其漏极电流为5A,耐压为200V ;端口203输出的PWM信号经过隔离变压器驱动MOS管Ql的栅极,MOS管Ql的漏极接整流电路101的输出正,MOS管Ql的源极接同步续流MOS管Q2的漏极,MOS管Q2的源极接整流电路101的输出负,MOS管Ql的源极和续流MOS管Q2的漏极的连接点还连接电感L ;端口205输出的PWM信号直接控制续流MOS管Q2的栅极,输出滤波电容C的一端和电感L的一端连接,滤波电容C另一端连接整流电路101的输出负。 Rectifying circuit 101 by the four 1N5406 rectifier diode, connected to a bridge rectifier circuit, BUCK circuit 103 includes a switch Q1, L, the switch Ql model Infineon MOS transistor SPU03N60C, a drain current of the MOS transistor Q2 and the inductor of 3A, a withstand voltage of 600V, MOS transistor Q2 is VISHAY company SI7450, a drain current of 5A, a withstand voltage of 200V; PWM signal output from the port 203 through the isolation transformer in the gate of the driving MOS transistor Ql, the MOS transistor Ql output of the rectifier circuit 101 connected to the drain of the n-source MOS transistor Ql to the drain electrode of the MOS synchronous freewheeling transistor Q2, the source of MOS transistor Q2 is connected to the negative output of the rectifier circuit 101, the source of the MOS transistor Ql and freewheeling the drain connection point MOS transistor Q2 is also connected to an inductor L; PWM signal output port 205 is directly controlled wheeling of the gate of the MOS transistor Q2, L the end of the output filter capacitor C and an inductor connected at one end, the other end connected to the filter capacitor C output rectifying circuits 101 negative.

[0073] 低压输出端Vout为24V,那么第一预设值取为24VX I. 05=25. 2V以上,这里第一预设值取30V,考虑到MOS管Ql的最小占空比D低于0. 05以下后,电路的效率很低,这里取最小占空比D为0. 13,那么利用BUCK电路的输出电压计算公式(I),可以算出第二预设值为184V,这个值不能高过续流MOS管Q2的耐压,并留有余量。 [0073] The low-voltage output terminal Vout is 24V, then the value is set at a first predetermined 24VX I. 05 = 25. 2V above, here a first preset value taken 30V, taking into account the MOS transistor Ql is less than the minimum duty ratio D after 0.05 or less, the low efficiency of the circuit, where the minimum duty ratio D is taken 0.13, the output voltage calculation formula (I) then use BUCK circuit, the second predetermined value is 184V can be calculated, this value can not higher than the freewheeling voltage MOS transistor Q2, and left margin.

[0074] 第三预设值取低于第一预设值30V以下的值,这里取24. 7V。 [0074] The third preset value takes a value lower than 30V below the first preset value, adopted here 24. 7V.

[0075] 电压检测控制电路102可由仙童半导体公司型号为FAN7930的PWM控制器和两片TL431三端可调分流基准源以及其它器件组成的同步续流驱动电路构成,上述电压检测控制电路102的端口201、端口202、端口203、端口204和端口205所实现的电压检测、PWM控制信号输出功能,均可由该电路实现,该电路的具体电路连接和原理均属公知技术范畴,在此不再一一说明。 [0075] The voltage detection control circuit 102 may be formed Fairchild Semiconductor Model freewheeling synchronous driving circuit FAN7930 PWM controller TL431 and two three-terminal adjustable shunt reference source, and other components constituting the composition, the voltage detection control circuit 102 port 201, port 202, port 203, port 204 and the voltage detection port 205 is achieved, the PWM control signal output, can be realized by the circuit, the circuit is connected and the specific principles known technique belong to the category of the circuit, which is not them out. 该电压检测控制电路102的开关频率为固定为200KHZ。 The voltage detection control circuit 102 is fixed at the switching frequency of 200KHZ. 那么电感L为47uH的功率电感,电容C为2200uF/25V的电解电容。 Then L is the inductance of the power 47uH inductance, capacitance C of electrolytic capacitor 2200uF / 25V is.

[0076] 实测性能如下表三: [0076] Measured Performance Table III below:

[0077] 表三 [0077] Table III

[0078] [0078]

Figure CN102723880AD00091

交流输入端最大峰值电流I. 74A AC input maximum peak current I. 74A

[0079] 由于加入电容Cl,在功率增大的前提下,交流输入端最大峰值电流明显降低,加入的同步续流管Q2,也明显提高了电路的变换效率。 [0079] Since the added capacitance Cl, under the premise of power increases, the maximum peak current AC input terminals significantly reduced, the added tube synchronous freewheeling Q2, significantly improves the conversion efficiency of the circuit. 相关波形和实测纹波由于和第一实施例相似,这里不再列出。 Since the correlation waveform and a ripple Found embodiment is similar to the first embodiment, there is no longer listed. 显而易见,本发明确实在75W以下小功率场合,可以实现前文所述的有益效果。 Obviously, the present invention is indeed less 75W low-power applications, the beneficial effects previously described may be implemented.

[0080] 显而易见,让电路在负载轻载时,BUCK电路工作在第一预设值50V至第二预设值120V之间,而在电路在负载满载时,BUCK电路工作在第一预设值30V至第二预设值184V之间,有利于更进一步变换提高效率,电压检测控制电路102只要对输出电压Vout的纹波电压进行检测,即可实现这一功能。 [0080] Obviously, when the circuit is so low load, BUCK circuit between the first predetermined value to a second predetermined value 50V 120V, in the full load, BUCK circuit in a first preset value circuit between 30V to 184V second predetermined value, is conducive to further improve the conversion efficiency, the voltage detection control circuit 102 as long as the ripple voltage of output voltage Vout is detected, this function can be realized. [0081] 上述二个实施例的输出纹波比较大,用于驱动LED灯是完全可以的,控制流过LED灯的最大电流,确保LED灯不被损坏。 [0081] The two above-described embodiments the output ripple is relatively large, for driving the LED lamp is completely possible, control the maximum current through the LED lamp, the LED lamp ensure not damaged. 由于BUCK电路的效率高,环路响应好,在上述二个实施例输出端接入第二级BUCK电路,第二级BUCK电路持续工作,这样最终的输出电压纹波可以做得很小,以便给要求比较高的后续电路供电。 Due to the high efficiency of the BUCK circuit, the loop response is good, in the second stage the access BUCK circuit output terminal embodiment two embodiments, the second stage BUCK circuit continue to work, so that the final output voltage ripple can be made small, so that to the requirements of the subsequent circuitry is relatively high.

[0082] 事实上,本方案用于隔离变换电源,一样可以实现发明目的,对于开关电源行业的技术人员来说,反激电路(FLY-BACK)事实上就是BUCK电路的一种变形,反激电路中的变压器不是真正意义上的变压器,实际上就是隔离式(有双绕组的)的电感,它兼起储能电感的作用,称为储能变压器,输出电压只与负载有关,与匝比无关,由于电路一旦实现隔离,输出不仅可以实现降压,还可以实现升压,所以反激电路又称为BUCK-B00ST变换器的一个理想隔离版本。 [0082] In fact, the present power conversion scheme for isolation, and they can achieve the object of the invention, the switching power supply industry skill, the flyback circuit (FLY-BACK) is actually a variation of the BUCK circuit, the flyback a transformer circuit is not true in the sense transformer is actually isolated (double winding) of the inductor, and which acts as a storage inductor, called the storage transformer, the output voltage is only related to the load, and the turns ratio irrelevant, since the circuit isolation, once achieved, can achieve not only the output of buck, boost may also be implemented, the flyback circuit also called a spacer over the converter bUCK-B00ST version. 请参考张兴柱著的《开关电源功率变换器拓扑与设计》第一版第60页正文第一行及第一段,该书的ISBN :978-7-5083-9015-4。 Zhang column refer to the "on-off electrical power converter topology and design" first edition text of the first line 60 and the first section, the book ISBN: 978-7-5083-9015-4. 或张占松、蔡宣三著的《开关电源的原理与设计》修订版第237页正文第一行及及第一段。 Or Zhangzhan Song, Cai Xuansan book "Theory and Design of Switching Power Supply" revised edition of the text of the first line 237 and the first segment and.

[0083] 第三实施例示出的就是这种用于隔离变换的电源,包括反激与正激。 [0083] This power supply is shown for the third embodiment of the insulating converter, including forward and flyback.

[0084] 第三实施例 [0084] Third embodiment

[0085] 图7示出了本发明第三实施例的原理图,公知的,反激电路是BUCK电路的一种变形,即把图2中的开关Ql位置换成储能电感L,而把原续流二极管Dl的位置换成开关Q1,原电感L的位置换成续流二极管Dl,二极管Dl在新位置一般叫整流二极管。 [0085] FIG. 7 shows a schematic diagram of a third embodiment of the present invention, known flyback circuit is a modification of the BUCK circuit, i.e., the position of the switch Ql in FIG 2 into the inductor L, and the original position freewheeling diode Dl is replaced by switch Q1, L is the inductance of the original position into the freewheeling diode Dl, the diode rectifier diode Dl is generally called in the new position. 储能电感L在这里就是储能变压器,这样得到的反激电路与BUCK电路的工作原理本质上是相同的,因为反激电路是BUCK电路的一种特殊电路形式。 Is essentially the same working principle, this is the inductor L of the transformer tank, thus obtained flyback circuit BUCK circuit, because the flyback circuit is a circuit of a special BUCK circuit form.

[0086] 第三实施例的交流变直流电路包括整流电路101、电压检测控制电路102、采用反激电路结构的BUCK电路103组成。 AC [0086] The third embodiment to DC circuit 101 includes a rectifier circuit, a voltage detection control circuit 102, circuit 103 uses BUCK flyback circuit structures. 注:图7中略去了去磁用的电路,又称钳位电路,如由二极管、电容、电阻组成的DCR钳位电路。 Note: the circuit is omitted in FIG. 7 with the demagnetization, also known as clamp circuits, such as the DCR by a diode clamping circuit, a capacitor, a resistor thereof.

[0087] 整流电路101将输入的交流电整流,输出脉动直流电,参见图3,电压检测控制电路102通过端口201和端口202检测脉动直流电的瞬时值,同时通过端口204检测低压输出端的输出电压Vout,204和输出端的中间电路为公知的光耦隔离等电路206 ;电压检测控制电路102同时通过端口203输出PWM信号控制BUCK电路103中开关Ql ;通常为一只MOS管。 [0087] AC rectified by the rectifier circuit 101 is input, the output pulsating direct current, see FIG. 3, the voltage detection control circuit 102 through the port 201 202 detects pulsation and port direct current instantaneous value, while the output voltage 204 detects the voltage output terminal port Vout of, intermediate circuit and an output terminal 204 of a known opto isolation circuit 206; 102 while the voltage detection control circuit 103 via the switch Ql PWM signal output port 203 BUCK circuit; typically an MOS transistor.

[0088] BUCK电路103连接在整流电路101之后,接收整流电路101输出的脉动直流电,BUCK电路103的输出为本交流变直流电路的隔离低压输出端Vout ;[0089] 电压检测控制电路102通过端口203输出PWM信号控制所述的BUCK电路103中的开关Q1,当整流电路101输出脉动直流电的瞬时值在第一预设值以上、第二预设值以下且低压输出端输出电压Vout低于第三预设值时,电压检测控制电路102输出PWM信号控制BUCK电路103工作,BUCK电路103输出经电容C滤波后得到低压直流电;当整流电路101输出脉动直流电的瞬时值高于第二预设值时,电压检测控制电路102通过端口203输出的PWM信号关闭,BUCK电路103中的开关Ql停止工作,即BUCK电路103中开关Ql处于断开状态,这时BUCK电路103不工作,电容C储能向输出端负载放电;低压输出端Vout电压高于对应的第三预设值时,电压检测电路102也控制关闭BUCK电路10 [0088] BUCK circuit 103 is connected after the rectifier circuit 101, output circuit 101 receives the rectified pulsating direct current, the output circuit 103 of the present BUCK circuit to DC voltage output terminal Vout isolated AC; [0089] The voltage detection control circuit 102 through a port switch Q1 BUCK circuit 103203 outputs a PWM signal according to the control, when the pulse rectifier circuit 101 outputs a direct current instantaneous value is above a first predetermined value, the second predetermined value and low-voltage output terminal of the output voltage Vout is lower than the first when three preset value, the voltage detection control circuit 102 outputs a PWM signal to control BUCK operation circuit 103, the output filtering capacitor C 103 BUCK obtained low-voltage DC circuit; when the pulse rectifier circuit 101 outputs a direct current instantaneous value is higher than the second predetermined value , the voltage detection control circuit 102 by a PWM signal output from the port 203 closed, the switch Ql BUCK circuit 103 is stopped, i.e., the switch Ql BUCK circuit 103 is in the off state, BUCK circuit 103 does not operate at this time, the storage capacitor C discharged to the load output; voltage output terminal Vout when the voltage is higher than a third predetermined value corresponding to the voltage detection circuit 102 also controls the circuit 10 to close BUCK 3,即BUCK电路103中开关Ql处于断开状态,以防输出电压Vout超过设定的第三预设值。 3, i.e., the switch Ql BUCK circuit 103 in the off state, to prevent the output voltage Vout exceeds the third predetermined value is set.

[0090] 本实施例的BUCK电路103采用反激电路结构,可以升压变换,电路带来的好处是BUCK电路103可以从输入脉动直流电压近似OV开始工作,即整流电路101输出脉动直流电压从很低的电压,第三实施例中的MOS管Ql就可以工作在PWM的开关状态。 [0090] BUCK circuit 103 of this embodiment of the flyback circuit structure, upconverting, brings the benefits of the circuit is approximately OV BUCK circuit 103 may start working the pulsating DC voltage from the input, i.e., the rectifying circuit 101 outputs the pulsating DC voltage from low voltage, the third embodiment of the MOS transistor Ql can be operated in the PWM off state. 当然,为了让电路更好地工作,MOS管Ql的源极还会连接公知的电流检测电路。 Of course, in order for the circuit to work better known current detection circuit connected to a source electrode of the MOS transistor Ql will. 即在本实施例反激电路中,第一预设值可以低于第三预设值。 In the present embodiment, i.e., a flyback circuit, the first predetermined value may be lower than the third preset value.

[0091] 显而易见,本发明第三实施例确实在75W以下小功率场合,实现隔离变换器的全部功能,同样可以实现前文所述的有益效果,其详细原理不再赘述。 [0091] Obviously, the third embodiment of the present invention does in the case of small power 75W or less, to achieve full functionality isolation transformer, can achieve the same advantageous effects described hereinbefore, the principle thereof will not be repeated in detail.

[0092] 图7示出的是本发明应用于隔离变换的反激变换器电源,事实上,基本正激电路也是BUCK电路的变形,请参考张兴柱著的《开关电源功率变换器拓扑与设计》第一版第28页3. I节至29页中间,或张占松、蔡宣三著的《开关电源的原理与设计》修订版第263页正文第一行及及第一段。 [0092] FIG. 7 shows a flyback power supply of the present invention is applied to the insulating converter, in fact, is substantially modified forward circuit BUCK circuit, see Zhang column of the "switching source power converter topology and design" 3. the first edition page 28 to 29 in section I intermediate, or Zhangzhan Song, Cai Xuansan book "Theory and design of switching power supply" revised edition of the text of the first line 263 and the first segment and.

[0093] 图8示出了第三实施例的另一种形式,本发明用于隔离正激变换的电原理图,在图7的基础上,把储能电感L(储能变压器)的输出绕组同名端反接一下,输出整流三极管Dl中串入续流电感LI,再加上续流二极管D2,如图8所示,图8中虚框103内连接关系为公知技术,其原理在张兴柱著的《开关电源功率变换器拓扑与设计》第一版第28页3. I节至29页中间论述很详细,这里不再赘述。 [0093] FIG. 8 shows another form of embodiment of the third embodiment, the present invention is an electrical schematic diagram of isolation forward transform on the basis of FIG. 7, the output inductor L (storage transformer) reverse same name at the end windings, the output rectifier Dl transistor in series with the freewheeling inductor LI, together with the freewheeling diode D2, shown in Figure 8, the dashed box 103 in FIG. 8 is a connection relationship known art, which in principle Zhang column of the "switching source power converter topology and design" first edition page 28 to 29 3. section I discusses in great detail the intermediate, is not repeated here.

[0094] 只要采用同样的控制方式:电压检测控制电路102通过端口203输出PWM信号控制所述的BUCK电路103中的开关Q1,当整流电路101输出脉动直流电的瞬时值在第一预设值以上、第二预设值以下且低压输出端输出电压Vout低于第三预设值时,电压检测控制电路102输出PWM信号控制BUCK电路103工作,BUCK电路103输出经LI以及电容C滤波后得到低压直流电;当整流电路101输出脉动直流电的瞬时值高于第二预设值时,电压检测控制电路102通过端口203输出的PWM信号关闭,BUCK电路103中的开关Ql停止工作,即BUCK电路103中开关Ql处于断开状态,这时BUCK电路103不工作,电容C储能向输出端负载放电;低压输出端Vout电压高于对应的第三预设值时,电压检测电路102也控制关闭BUCK电路103,即BUCK电路103中开关Ql处于断开状态,以防输出电压Vout超过设定的第三预设值。 [0094] By the same control as long as: a voltage detection control circuit 102 through the port 203 BUCK circuit 103 outputs a PWM signal for controlling the switch in Q1, when the pulse rectifier circuit 101 outputs a direct current instantaneous value is above a first predetermined value when the second predetermined value and low-voltage output terminal of the output voltage Vout is lower than a third predetermined value, the voltage detection control circuit 102 outputs a PWM signal to control operation of the circuit 103 BUCK, BUCK circuit 103 outputs the LI and a capacitor (C filter) to give a low pressure DC; when the pulse rectifier circuit 101 outputs a direct current instantaneous value is higher than a second predetermined value, the voltage detection control circuit 102 by a PWM signal output from the port 203 closed, the switch Ql, BUCK circuit 103 is stopped, i.e., BUCK circuit 103 switch Ql is in an off state, BUCK circuit 103 does not operate at this time, the storage capacitor C to the output load discharge; low-voltage output terminal Vout voltage is higher than a third predetermined value corresponding to the voltage detection circuit 102 also controls the closed circuit BUCK 103, i.e., the switch Ql BUCK circuit 103 in the off state, to prevent the output voltage Vout exceeds the third predetermined value is set.

[0095] 第三实施例的另一种形式一样实现了发明目的, [0095] Another form of a third embodiment of the invention, implemented as an object,

[0096] 上述三个实施例不仅可以用在单相交流电,对于本技术领域的技术人员,用于三相交流输入的场合,同样可以实现发明目的,第四实施例示出就是这种应用。 [0096] Not only the above three embodiments may be used in single-phase AC power, those skilled in the art, for the case of three-phase AC input, the invention can also achieve the object, a fourth embodiment of this application is illustrated.

[0097] 第四实施例[0098] 图9示出了第四实施例的原理图,参见图9,虚框104为交流电源,图中示出的电源内部是Y形接法,A接法是一样的,其中A、B、C三个接线端子分别对应A、B、C三相。 [0097] Fourth Embodiment [0098] FIG. 9 shows a schematic diagram of a fourth embodiment, referring to FIG. 9, block 104 of the virtual AC power supply, an internal power supply is shown is a Y-connection, A connection is the same, wherein a, B, C respectively correspond to three terminals a, B, C-phase. 虚框105为整流电路中的下半桥,由二极管Da、Db、Dc组成;整流电路中上半桥由三路本发明的主体电路30a、30b、30c直接替代,电路30a、30b、30c结构完全相同,都由电压检测控制电路 Virtual box 105 is in the half bridge rectifier circuit, a diode Da, Db, Dc composition; half-bridge rectifier circuit by the body of the present invention, three-way circuit 30a, 30b, 30c direct replacement, circuits 30a, 30b, 30c structure exactly the same, by the voltage detection control circuit

102,BUCK电路103组成,图9中的102后缀加上a,表示是三相交流电中A相对应的工作通道,开关管Ql和续流管Dl以及电感L采用同样的标示方法,表明它们所在的通道。 102, BUCK circuit 103 composed of FIG 9102 plus the suffix a, A represents a three-phase alternating current corresponding to the working channel, the switch Ql and the continuous flow tube and an inductor L Dl labeling method using the same, indicating that they are located channel.

[0099] 基于第一实施例的工作原理,电路30a、30b、30c轮流给输出端Vout供电,这样降低了输出纹波,并且平衡了A、B、C三相的用电,图10-1至图10-3示出了本发明第四实施例的工作区间、电流包络、输出纹波示意图;其中T为20mS,对应我国的50Hz交流电,输出电压为48V,输出电流为IA的波形图,A、B、C为对应的三相交流波形图,380VAC的峰值为537V,图9电路的3个通道的工作区间为: [0099] The working principle of the first embodiment, a circuit 30a, 30b, 30c to turn the power supply output terminal Vout, which reduces the output ripple, and the balance of power A, B, C of the three phases, 10-1 in FIG. to 10-3 illustrate a fourth embodiment of the working range of the present invention, the current envelope, the output ripple schematic; wherein T is 20mS, corresponding to our 50Hz AC output voltage is 48V, the output current IA of the waveform of FIG. , a, B, C to three-phase AC waveform diagram corresponding to the peak of 537V 380VAC, 3 channels workspace circuit of FIG. 9 is:

[0100] I、电路30a工作在ac以及a_b两个区间,a_c是指30a通道的BUCK电路103a工作,对图9中电容C充电,电流经二极管Dc流回三相电中的C相;ab是指30a通道的BUCK电路103a工作,对图9中电容C充电,电流经二极管Db流回三相电中的B相;在图10-1中,电路30a工作区间用填充斜砖墙表示。 [0100] I, and the ac circuit 30a operate a_b two sections, a_c BUCK circuit means 103a of the working channel 30a, the charging of the capacitor C in FIG. 9, the current flows back through the three-phase diode Dc in phase C; ab & BUCK circuit means 103a of the working channel 30a, the capacitor C is charged in FIG. 9, the current flows back through the three-phase diode Db in phase B; in Figure 10-1, the circuit 30a represented by filled work zone ramp brick.

[0101] 2、电路30b工作在bc以及ba两个区间,bc是指30b通道的BUCK电路103b工作,对图9中电容C充电,电流经二极管Dc流回三相电中的C相;ba是指30b通道的BUCK电路103b工作,对图9中电容C充电,电流经二极管Da流回三相电中的A相;电路30b工作区间用填充星状小点表示。 [0101] 2, circuit 30b operate in two sections ba and bc, bc BUCK circuit 103b refers to the working channel 30b, the charging of the capacitor C in FIG. 9, the current flows back through the three-phase diode Dc in phase C; ba BUCK circuit 103b refers to the working channel 30b, the charging of the capacitor C in FIG. 9, the current flows back through the diode Da of the three-phase a-phase; circuit 30b operating region represented by filled dots star.

[0102] 3、电路30c工作在cb以及ca两个区间,cb是指30c通道的BUCK电路103c工作,对图9中电容C充电,电流经二极管Db流回三相电中的B相;ca是指30c通道的BUCK电路103c工作,对图9中电容C充电,电流经二极管Da流回三相电中的A相;电路30b工作区间用填充平行竖线条表示。 [0102] 3, circuit 30c operate in two sections ca and cb, cb BUCK circuit 103c refers to the working channel 30c, the charging of the capacitor C in FIG. 9, the current flows back through the diode Db in the three-phase B-phase; ca BUCK circuit 103c refers to the working channel 30c, FIG charged capacitance C 9, current flows through diode Da back into the three-phase a-phase; circuit 30b operating region represented by parallel vertical lines filled.

[0103] 图10-2中303所指的为对应通道的电流包络图,对应的通道可以看图10-1中的标识,如cb所指的工作区间的正下方电流包络块图,就是30c通道的工作电流包络图。 [0103] FIG. 10-2 303 refers to the current envelope corresponding channel, the corresponding channel can be identified in Figure 10-1, cb referred to as the working section immediately below the current block of FIG envelope, 30c is a channel operating current envelope.

[0104] 图10-3中304为本发明第四实施例中输出端电容C两端的纹波电压图;由于是三相输入,各相之间接续良好,所以输出纹波较小,可以证明,当每个通道的第二预设值为相电压的峰值电压一半时,3个通道刚好无间隙工作,这时的输出纹波已达到最小。 FIG ripple voltage across the output end of the capacitor C embodiment of the fourth embodiment [0104] of the present invention, FIG. 10-3 304; Since the three-phase input, good connection between the phases, the output ripple is small, can prove , when the peak voltage of the second phase voltage is preset for each channel half, three channels without clearance work immediately, then the output ripple is minimized.

[0105] 图10-1、10-2、10_3系列的波形与计算机仿真出来的结果是一致的。 [0105] FIG 10-1,10-2,10_3 series waveform out computer simulation results are consistent.

[0106] 事实上,由于电压检测控制电路102a、102b、102c共地,图9中的三个电压检测控制电路可以优化为一个,而且常见的MOS管,由于体内都有寄生二极管,容易引起电流经电感L,再经过MOS管内寄生二极管反灌,所以要用完整的6只整流二极管,且电路中,当每个通道的第二预设值为相电压的峰值电压一半以下时,3个通道中的电感可以合并为一只,续流二极管可以合并为一只,图11给出就是这种演变后的电路,第五实施例示出的正是这个电路。 [0106] In fact, since the voltage detection control circuit 102a, 102b, 102c total, the three voltage detection control circuit 9 can be optimized for one MOS transistor and common, since the body has a parasitic diode, current prone through inductor L, and then through the parasitic diode of the MOS transistor backfeed, so use the full six rectifier diodes, and the circuit, when the second predetermined value is half the peak voltage of the phase voltage of each channel, three channels the inductance can be combined into a freewheeling diode may be combined into one, Figure 11 shows that the evolution of such a circuit, the circuit of the fifth embodiment is shown.

[0107] 第五实施例 [0107] Fifth Example

[0108] 第五实施例是由第四实施例优化而来的,参见图11,图11中的电压检测控制电路102,有3个检测端口201a、201b、201c,检测三相的瞬时电压差,还有一个检测端口204,检测输出电压Vout,电压检测控制电路102分别输出对应的三路PWM信号203a、203b、203c,分别控制Qla、Qlb、Qlc,三路PWM信号203a、203b、203c在任何情况下,只有一路有输出,另外两路无输出。 [0108] The fifth embodiment is optimized by the fourth embodiment of the came, 11, 11 in FIG voltage detection control circuit 102, there are three detection ports 201a, 201b, 201c, three-phase instantaneous voltage difference detected , there is a detection port 204, the output voltage Vout of the detection, the voltage detection control circuit 102 outputs a PWM signal corresponding to the three-way 203a, 203b, 203c, respectively, to control Qla, Qlb, qlc, three PWM signals 203a, 203b, 203c in In any case, there is only way output, the other two no output. 续流二极管可以合并为一只,为续流二极管D1,该电路由于只用了一只电感L和一只续流二极管Dl,具有成本低的优点。 Freewheeling diode may be combined into one, it is a freewheeling diode D1, the circuit since only one of the inductance L and a freewheeling diode Dl, has the advantage of low cost.

[0109] 图9和图11是应用于三相三线制,对于本技术领域的普通技术人员来说,把本发明电路应用于三相四线制的场合,电路相对简单,容易实现,这里不再用实施例赘述。 [0109] FIGS. 9 and 11 are applied to a three-phase three-wire system, those of ordinary skill in the art, the circuit of the present invention is applied to the case of three-phase four-wire system, the circuit is relatively simple, easy to implement, is not here Example embodiments then repeated. 以上仅是本发明的优选实施方式,应当指出的是,上述优选实施方式不应视为对本发明的限制,本发明的保护范围应当以权利要求所限定的范围为准。 The above are only preferred embodiments of the present invention, it should be noted that the above-described preferred embodiments should not be construed as limiting the present invention, the scope of the present invention should be defined by the claims scope of equivalents. 正如前文所述,本发明所言之BUCK电路包括BUCK电路的基本电路形式,如实施例一中的BUCK电路103,还包括公知技术中BUCK电路基本电路形式的变形,如实施例二和实施例三中的BUCK电路103。 As mentioned earlier, said the present invention BUCK circuit of a basic circuit forms include BUCK circuit, BUCK circuit 103 example 1 as described, further comprising a well-known technique in basic circuit form BUCK circuit modification, as described in Example 2 and Embodiment BUCK circuit 103 is three. 而基于BUCK电路工作原理的变形电路还有其它形式,对于本技术领域的普通技术人员来说,在不脱离本发明的精神和范围内,还可以做出若干改进和润饰,如使用双极性晶体管代替上述的场效应管,采用公知的三极管复合管代替相应的三极管,在此不能穷举,但这些改进和润饰也应视为本发明的保护范围。 And there are other forms of deforming circuit based on the operating principle of the circuit BUCK, those of ordinary skill in the art, in the present invention without departing from the spirit and scope, can make various improvements and modifications, such as bipolar transistor instead of the FET, a known composite tube triode instead of the corresponding transistor, this can not be exhaustive, but these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (5)

1. 一种交流变直流电路,包括整流电路、电压检测控制电路、BUCK电路;所述的BUCK电路连接在所述的整流电路之后,BUCK电路的输出为所述的交流变直流电路的低压输出端;所述的电压检测控制电路输出PWM信号控制所述的BUCK电路;所述的整流电路输出脉动直流电,所述的电压检测控制电路检测脉动直流电的瞬时值、检测低压输出端电压值,其特征在于:所述电压检测控制电路设置有用于限制BUCK电路最大工作电压的第二预设值、用于限制BUCK电路工作下限的第一预设值,和用于限制BUCK电路最大输出电压的第三预设值,所述的电压检测控制电路按下述要求输出PWM信号控制BUCK电路中开关: 当所述的整流电路输出脉动直流电的瞬时值高于第一预设值时,所述的电压检测控制电路输出的PWM信号控制所述的BUCK电路工作; 当所述的整流电路输出脉动直流电的瞬 An AC to DC circuit comprising a rectifying circuit, a voltage detection control circuit, BUCK circuit; the BUCK circuit is connected after the rectifying circuit, the output of the BUCK circuit is low voltage output of the AC to DC circuit end; BUCK said voltage detecting circuit outputs a PWM signal to control said control circuit; said rectifier circuit output pulsating direct current, the voltage detection control circuit for detecting an instantaneous value of the pulsating direct current, low voltage output of the voltage detection value, which characterized in that: said voltage detection control circuit is provided with a second predetermined value for limiting the maximum operating voltage of BUCK circuit for limiting the lower limit of the BUCK circuit a first predetermined value, and for limiting the maximum output voltage of circuit BUCK three preset value, the voltage detection control circuit outputs a PWM signal according to the following requirements BUCK circuit switching control: when the output of the rectifier circuit pulsating direct current instantaneous value is higher than a first predetermined value, said voltage BUCK circuit PWM signal output from the detection control circuit; and when the output of the rectifier circuit pulsating direct current instantaneous 值高于第二预设值时,所述的电压检测控制电路输出的PWM信号关闭,所述的BUCK电路停止工作; 所述的电压检测控制电路检测所述低压输出端电压值,当所述的低压输出端电压值超过第三预设值,所述的电压检测控制电路输出的PWM信号关闭,所述的BUCK电路停止工作。 When the value is higher than the second predetermined value, the voltage detection control circuit outputs a PWM signal is off, said BUCK circuit stops working; low-voltage control circuit detects the output voltage value of the terminal voltage detection, when the the low voltage output of the voltage value exceeds a third predetermined value, the voltage detection control circuit outputs a PWM signal is off, said BUCK circuit to stop working.
2.根据权利要求I所述的交流变直流电路,其特征在于:所述的第二预设值的电压高于所述的第一预设值电压。 2. I claim the AC to DC circuit according to claim, characterized in that: the second voltage is higher than a preset value of the voltage of the first predetermined value.
3.根据权利要求I或2所述的交流变直流电路,其特征在于:所述的第二预设值的电压随着所述的低压输出端电压纹波而变化,所述的低压输出端电压纹波变大时,所述的第二预设值的电压由所述的电压检测控制电路自动升高。 According to claim I or claim 2, wherein the AC to DC circuit, wherein: a voltage of said second preset value as the low voltage output of the voltage ripple is changed, the output of the low-pressure when the voltage ripple is increased, the voltage of the second preset value is automatically raised by the voltage detection control circuit.
4.根据权利要求3所述的交流变直流电路,其特征在于:所述的第一预设值的电压随着所述的低压输出端电压纹波而变化,所述的低压输出端电压纹波变大时,所述的第一预设值的电压由所述的电压检测控制电路自动降低。 According to claim 3, wherein said AC to DC circuit, wherein: a voltage of said first predetermined value as the low voltage output of the voltage ripple is changed, the low voltage output terminal of the voltage ripple when the wave is increased, the voltage of the first preset value is automatically reduced by the voltage detection control circuit.
5.根据权利要求I所述的交流变直流电路,其特征在于:所述整流电路的输出端和所述的BUCK电路中间并联电容,所述的电容容量在IuF以下。 5. Exchange according to claim I to DC circuit, wherein: the intermediate output terminal of the rectifier circuit and the BUCK circuit shunt capacitance, the capacitance in IuF less.
CN2012101948233A 2012-06-13 2012-06-13 Alternating current-to-direct current circuit CN102723880A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015196672A1 (en) * 2014-06-26 2015-12-30 欧普照明股份有限公司 Auxiliary power source circuit with power factor correction circuit, and control method and device therefor
CN105491728A (en) * 2016-01-21 2016-04-13 广州金升阳科技有限公司 Direct filtering type switching power supply
WO2017133379A1 (en) * 2016-02-05 2017-08-10 广东欧珀移动通信有限公司 Adapter and charging control method
CN107078632A (en) * 2014-10-02 2017-08-18 三菱电机株式会社 Chopper circuit control device
CN107425584A (en) * 2016-05-23 2017-12-01 双叶电子工业株式会社 Supply unit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2930083Y (en) * 2006-07-27 2007-08-01 东风汽车股份有限公司 24V turned into 12V power supply DC power source of vehicle carried cooling and heating box
US20100123448A1 (en) * 2008-11-18 2010-05-20 Texas Instruments Incorporated Controlled on-time buck pfc
CN102332837A (en) * 2011-10-24 2012-01-25 长沙广义变流技术有限公司 High-power-factor single-phase voltage-reducing rectification voltage-stabilizing circuit and method for controlling same
WO2012014202A1 (en) * 2010-07-26 2012-02-02 Ney Li Pte Ltd Ac/dc low voltage power supply device and method of stepping down ac/dc voltage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2930083Y (en) * 2006-07-27 2007-08-01 东风汽车股份有限公司 24V turned into 12V power supply DC power source of vehicle carried cooling and heating box
US20100123448A1 (en) * 2008-11-18 2010-05-20 Texas Instruments Incorporated Controlled on-time buck pfc
WO2012014202A1 (en) * 2010-07-26 2012-02-02 Ney Li Pte Ltd Ac/dc low voltage power supply device and method of stepping down ac/dc voltage
CN102332837A (en) * 2011-10-24 2012-01-25 长沙广义变流技术有限公司 High-power-factor single-phase voltage-reducing rectification voltage-stabilizing circuit and method for controlling same

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015196672A1 (en) * 2014-06-26 2015-12-30 欧普照明股份有限公司 Auxiliary power source circuit with power factor correction circuit, and control method and device therefor
CN107078632A (en) * 2014-10-02 2017-08-18 三菱电机株式会社 Chopper circuit control device
CN107078632B (en) * 2014-10-02 2019-07-19 三菱电机株式会社 Chopper circuit control device
CN105491728A (en) * 2016-01-21 2016-04-13 广州金升阳科技有限公司 Direct filtering type switching power supply
CN105491728B (en) * 2016-01-21 2017-05-24 广州金升阳科技有限公司 Direct filtering type switching power supply
WO2017133379A1 (en) * 2016-02-05 2017-08-10 广东欧珀移动通信有限公司 Adapter and charging control method
CN107425584A (en) * 2016-05-23 2017-12-01 双叶电子工业株式会社 Supply unit

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