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CN103294088A - Segmented variable-cross-section winding based tapped auto-coupling alternating-current voltage stabilizer - Google Patents

Segmented variable-cross-section winding based tapped auto-coupling alternating-current voltage stabilizer Download PDF

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CN103294088A
CN103294088A CN 201310192164 CN201310192164A CN103294088A CN 103294088 A CN103294088 A CN 103294088A CN 201310192164 CN201310192164 CN 201310192164 CN 201310192164 A CN201310192164 A CN 201310192164A CN 103294088 A CN103294088 A CN 103294088A
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circuit
winding
connected
measuring
cross
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CN 201310192164
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滕敏亮
滕腾
滕军
张文超
王耀华
林建豪
余浩
范桂芳
蔡景国
金珍海
雷建峰
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浙江腾腾电气有限公司
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Abstract

The invention provides a segmented variable-cross-section winding based tapped auto-coupling alternating-current voltage stabilizer comprising a measuring circuit, a main control circuit, a driving circuit, a plurality of relays and a winding. The measuring circuit is used for measuring input voltage and output voltage of the stabilizer, an output end of the measuring circuit is connected with the main control circuit, the main control circuit is connected with the driving circuit which is connected with the relays, the winding is provided with a plurality of taps which segment the winding into a plurality of segments, areas of cross sections of the segments are different from one another, the relays are connected with the taps of the winding respectively and are used for controlling connection and disconnection of the taps, and normally open contacts of the relays are connected together. Due to adoption of the segmented variable-cross-section winding, copper materials can be saved greatly and cost can be reduced.

Description

基于分段变截面绕组的抽头式自耦型交流稳压器 Tapered segment based on a tapped autotransformer winding AC voltage regulator

技术领域 FIELD

[0001] 本发明属于稳压器领域,具体涉及一种基于分段变截面绕组的抽头式自耦型交流稳压器。 [0001] The present invention belongs to the field of voltage regulators, particularly relates to a tapped autotransformer AC voltage regulator variable section based on the segment winding.

背景技术 Background technique

[0002] 抽头式自耦型交流稳压器主回路的原理图如图1所示,当输入电压υι=220ν时,测控电路和程序使得继电器JD3得电动作,使其触点J3闭合;使其余继电器(JDO、JDU JD2、JD4、JD5、JD6、JD7)失电,它们的触点(JO、JU J2、J4、J5、J6、J7)断开。 [0002] FIG tapped autotransformer principle regulator type AC main circuit shown in Figure 1, when the input voltage υι = 220ν, program monitoring and control circuit, and so that the relay is energized JD3 operation, it closes the contact J3; so remaining relay (JDO, JDU JD2, JD4, JD5, JD6, JD7) loss of power, their contacts (JO, JU J2, J4, J5, J6, J7) is disconnected. 这样输出电压 Thus the output voltage

[0003] 当输入电压仏〈22(^时,测控电路和程序通过电压测量电路得知U1的大小,并根据U1小于额定电压220V的程度来决定继电器JD4、JD5、JD6、JD7中的哪一个得电动作,并使其触点闭合(其余继电器失电,它们的触点断开)。由于这时的匝比是升压,所以最终输出电压U0等于或接近额定电压220V。 [0003] When the input voltage Fo <22 (^, monitoring and control programs, and that the size of the circuit U1 by a voltage measurement circuit, and determines the relay U1 JD4 The degree less than the rated voltage of 220V, JD5, JD6, in which a JD7 energized operation, and allowed to contact closure (relay de-energizes the rest, their contacts open). Since the step-up turns ratio this time, the final output voltage equal to or near the rated voltage U0 220V.

[0004] 当输入电压UP220V时,测控电路和程序通过电压测量电路得知U1的大小,并根据U1大于额定电压220V的程度来决定继电器JDO、JDU JD2中的哪一个得电动作,并使其触点闭合(其余继电器失电,它们的触点断开)。 [0004] When the input voltage UP220V, measurement and control circuit by measuring the voltage, and the program that the circuit size of U1, and to decide which action relay energized JDO, JDU JD2 U1 is greater than the rated voltage of 220V according to the degree, and allowed to contact closure (relay de-energizes the rest, their contacts open). 由于这时的匝比是降压,所以最终输出电压^等于或接近额定电压220V。 Since the turns ratio at this time is a buck, the ^ final output voltage equal or close to the rated voltage of 220V.

[0005] 具体的输入、输出电压与相应的继电器触点状态见表I。 [0005] Specifically input, the output voltage corresponding to the state of the relay contacts shown in Table I.

[0006] 表I输入、输出电压与相应的继电器触点状态关系表 [0006] Table I input, the output voltage of the relay contact corresponding to the state table

Figure CN103294088AD00031

这样,当输入电压在173〜275V之间波动变化时,输出电压都能稳定在额定电压220V上。 Thus, when the input voltage fluctuation between 173~275V, the output voltage can be stabilized at the rated voltage of 220V.

[0007] 但是,目前市场上类似产品设计的整个线包绕组从O〜h的线径是等粗细的,这样会浪费很多铜线,增加产品成本。 [0007] However, the entire line currently on the market similar products design package winding wire diameter is from O~h such as thickness, this will waste a lot of copper, increased product cost.

发明内容[0008] 本发明针对上述现有技术的不足,提供了一种分段变截面绕组,该分段变截面绕组可减小产品体积,降低产品成本。 [0008] The present invention is directed to the above-described deficiencies of the prior art, there is provided a variable cross section segment winding, the winding segments may be variable section reduce product size, reduce product cost.

[0009] 本发明是通过如下技术方案实现的: [0009] The present invention is achieved by the following technical solutions:

一种基于分段变截面绕组的抽头式自耦型交流稳压器,包括测量电路、主控电路、驱动电路、多个继电器和绕组; Tapered segment based on a tapped autotransformer winding AC voltage regulator, comprising a measuring circuit, a main control circuit, a drive circuit, a plurality of relays and windings;

测量电路用于测量稳压器的输入电压和输出电压,测量电路的输出端与主控电路相连,主控电路与驱动电路相连,驱动电路与多个继电器相连; Measuring circuit for measuring the regulator input voltage and output voltage, the main control circuit connected to the output terminal of the measuring circuit, connected to the main control circuit to the drive circuit, connected to a driving circuit and a plurality of relays;

所述绕组为一具有多个抽头的绕组,所述多个抽头将绕组分为多个区段,所述每个区段的横截面面积各不相同;多个继电器分别与绕组的多个抽头相连,用于控制所述抽头的通断;多个继电器的常开触点连接在一起。 Said winding is a winding having a plurality of taps, a plurality of winding taps into a plurality of sections, the cross-sectional area of ​​each segment vary; and a plurality of relays to a plurality of winding taps It is connected, for controlling the tap-off; a plurality of normally open relay contacts are connected together.

[0010] 进一步的,所述主控电路包括单片机、8D锁存器、闻有效上电复位电路、低有效上电复位电路和晶振电路,单片机与8D锁存器相连,高有效上电复位电路与单片机相连,低有效上电复位电路与8D锁存器相连,晶振电路与单片机相连,用于产生振荡信号给单片机。 [0010] Further, the main control circuit comprises a microcontroller, a latch 8D, smell active on reset circuit, connected to the active low reset circuit and crystal oscillation circuit, SCM and latch 8D, the high active power-on reset circuit the microcontroller is connected to the low active power-on reset circuit is connected to the latch 8D, coupled to the oscillator circuit to the microcontroller, for generating an oscillating signal to the microcontroller.

[0011] 进一步的,所述单片机还与一显示器相连。 [0011] Further, the microcontroller is further connected to a display.

[0012] 进一步的,所述驱动电路包括一8通道的达林顿阵列。 [0012] Further, the drive circuit comprises a Darlington array 8-channel.

[0013] 本发明所述的基于分段变截面绕组的抽头式自耦型交流稳压器通过采用分段变截面绕组,从而可以大大节约铜材,降低成本。 [0013] Tapered segment based on a tapped autotransformer winding AC regulator through the use of variable cross section segment windings, which can greatly reduce the copper of the present invention, to reduce costs.

附图说明 BRIEF DESCRIPTION

[0014] 图1为抽头式自耦型交流稳压器的主回路原理图; [0014] FIG 1 is a main circuit diagram tapped autotransformer AC voltage regulator;

图2为抽头式自耦型交流稳压器的结构框图; FIG 2 is a block diagram showing a tapped autotransformer AC voltage regulator;

图3为抽头式自耦型交流稳压器的主控电路原理图。 FIG 3 is a tapped autotransformer principle AC voltage regulator control circuit in FIG.

具体实施方式 detailed description

[0015] 下面结合附图和具体实施方式对本发明做进一步详细的说明。 [0015] The present invention will be further described in detail in conjunction with accompanying drawings and specific embodiments.

[0016] 如图1、2所示,本发明提供了一种基于分段变截面绕组的抽头式自耦型交流稳压器,包括测量电路、主控电路、驱动电路、多个继电器和绕组;测量电路用于测量稳压器的输入电压和输出电压,测量电路的输出端与主控电路相连,主控电路与驱动电路相连,驱动电路与多个继电器相连; [0016] As shown in FIG 1, the present invention provides a variable cross section segment based tapped autotransformer winding AC voltage regulator, comprising a measuring circuit, a main control circuit, a drive circuit, a plurality of relays and windings ; measuring input voltage and an output circuit for measuring the voltage regulator, the main control circuit connected to the output terminal of the measuring circuit, connected to the main control circuit to the drive circuit, connected to a driving circuit and a plurality of relays;

所述绕组为一具有多个抽头的绕组,所述多个抽头将绕组分为多个区段,所述每个区段的横截面面积各不相同;多个继电器分别与绕组的多个抽头相连,用于控制所述抽头的通断;多个继电器的常开触点的一端连接在一起。 Said winding is a winding having a plurality of taps, a plurality of winding taps into a plurality of sections, the cross-sectional area of ​​each segment vary; and a plurality of relays to a plurality of winding taps It is connected, for controlling the tap-off; end of the plurality of relay normally open contact connected together.

[0017] 采用本发明所述分段变截面绕组的抽头式自耦型交流稳压器的好处阐述如下: 如果暂不考虑调压器的损失,则有: [0017] The benefits of using the present invention the variable cross-section segment of a tapped autotransformer winding AC voltage regulator set forth as follows: if not to consider the loss of the voltage regulator, there are:

P1-P1 (I) P1-P1 (I)

亦即有: That are:

= U1I' — UaL2 (2)可见,在传输的功率P2 —定的情况下:当U0增大时,I2减小;当^减小时,I2增大。 = U1I '- UaL2 (2) can be seen, the transmission power P2 - under given circumstances: when U0 increases, I2 decreases; when ^ is reduced, I2 increase. 所以我们对线包绕组可以根据各段电流的不同选用粗细不同的线径:ab段、bc段、cd段、de段、段,越来越细。 So we covered winding wire segments may be selected according to the different currents of different thickness diameter: ab segment, bc segment, segment CD, de section, section getting smaller.

[0018] 实际设计时,每段的具体线径可根据实际电流来选择。 [0018] The actual design, each specific diameter may be selected according to the actual current. 可见,采用分段变截面绕组的抽头式自耦型交流稳压器可以节约铜材,降低成本。 Be seen, the use of variable cross section segment of a tapped autotransformer winding AC voltage regulator can save copper, to reduce costs.

[0019] 如图3所示,图中JDO〜JD7为8个12V的继电器,其对应的常开触点在图1中的JO〜J7。 [0019] As shown in FIG. 3, FIG JDO~JD7 eight 12V relay, its corresponding normally open contacts in FIG. 1 JO~J7. 驱动电路主要包括U4,本实施例中U4为ULN2803,它是一个8通道的高压大电流达林顿阵列,其内部的YO〜Y7是8个OC门(或OD门)的反相驱动器,该OC门的输出三极管耐压为50V,驱动能力为500mA。 Driving circuit includes U4, U4 to the present embodiment ULN2803, which is an 8-channel high-voltage high-current Darlington array inside YO~Y7 eight OC gate (or gate OD) of the inverter drive, the OC gate transistor output withstand voltage of 50V, drive capability of 500mA.

[0020] 主控电路包括单片机、8D锁存器、闻有效上电复位电路、低有效上电复位电路和晶振电路,单片机与8D锁存器相连,高有效上电复位电路与单片机相连,低有效上电复位电路与8D锁存器相连,晶振电路与单片机相连,用于产生振荡信号给单片机。 [0020] The main control circuit comprises a microcontroller, a latch 8D, smell active on reset circuit, the active low reset circuit and crystal oscillation circuit, coupled to the microcontroller and 8D latches, connected on the high active reset circuit and microcontroller, low power-on reset circuit is effectively connected to the latch 8D, coupled to the oscillator circuit to the microcontroller, for generating an oscillating signal to the microcontroller. 图3中Ul为STM8S103K系列的单片机(其它类型单片机亦可)。 Figure 3 is a STM8S103K Ul series microcontroller (MCU also other types). Cl和R9构成高有效上电复位电路,上电瞬间,为单片机Ul的复位引脚NRST提供一个短暂的复位高电平。 Cl and R9 constitute a high active power-on reset circuit, power-on instant, a short high level to reset the microcontroller Ul NRST the reset pin. Ul的8位并行接口H)(PD7〜TOO)为U2 (74LS273)提供输入驱动信号。 8-bit parallel interface Ul H) (PD7~TOO) provides an input drive signal U2 (74LS273). 用Ul的PC7提供一个上升沿有效的写入信号给U2的CLK。 PC7 Ul with a rising edge of the write signal CLK to U2. U2是8D锁存器,可采用74LS273 (或74HC273),起到逻辑缓冲和数据锁存作用,其详细作用原理下文详述。 U2 is a latch 8D, can be 74LS273 (or 74HC273), play the role of the logical buffer and a data latch, a detailed action principle described in detail below. RlO和C2是低有效上电复位电路,为U2 (74LS273)的清零端(m)提供一个低有效的上电复位信号,使U2在上电瞬间输出保证为零。 RlO and C2 are active low power-on reset circuit that provides a low-power-on reset signal U2 (74LS273) a clear terminal (m), so that the instantaneous output power U2 ensure zero. 电容COU C02和晶振X构成晶振电路,产生12MHz的振荡信号给单片机U1。 And X COU C02 crystal capacitance oscillator circuit configuration, generates the oscillation signal of 12MHz to the microcontroller U1. 单片机Ul的PC6、PC5、PC4用来为显示器提供驱动信号(STB、CLK和DIO),显示器可采用LED显示模块,亦可以采用IXD显示模块。 The microcontroller Ul PC6, PC5, PC4 for providing a drive signal (STB, CLK and DIO) is a display, the display can be LED display module, the display module can also be employed IXD.

[0021] 测量电路主要包括U3-A和U3-B,采用LM324芯片,其内部有四个运算放大器,此处使用其中的两个(U3-A和U3-B)运放作为稳压器输入电压U1和输出电压U0的测量电路。 [0021] The measuring circuit includes a U3-A and U3-B, using LM324 chip, its internal four operational amplifiers, used herein in which two (U3-A and U3-B) as the regulator input amplifier measuring circuit output voltage U1 and the voltage U0. R1、R2、R3、R4和U3-A构成典型的差动放大器,用来测量稳压器输入电压Uio R5、R6、R7、R8和U3-B也是一个差动放大器,用来测量稳压器输出电压U00`[0022] 本发明所述基于分段变截面绕组的抽头式自耦型交流稳压器的工作原理如下: R1, R2, R3, R4, and U3-A typical configuration of a differential amplifier for measuring the input voltage regulator Uio R5, R6, R7, R8, and U3-B is also a differential amplifier for measuring the voltage regulator output voltage U00` [0022] based on the variable cross-section segment of a tapped autotransformer winding AC voltage regulator of the present invention works as follows:

首先阐述U2的逻辑缓冲作用。 First elaborated logical buffer U2. 如果没有U2的逻辑缓冲作用,因为单片机Ul在刚一上 If there is no logical buffer U2, since just a single chip in the Ul

电时其端口H)可能输出为全“ I ” (PD=FFH=I 111111IB ),这个全“ I ”信号(8个高电平)就会直接加在U4 (ULN2803)的输入端,会导致U4内部YO〜Y7的输出为低,从而使八个继电器都吸合动作,进而它们的常开触点JO〜J7全部同时闭合,这会使自耦调压器的八个绕组短路,会烧毁整个调压器的。 When the port which is electrically H) may be output is all "I" (PD = FFH = I 111111IB), the whole "I" signal (8 high) will be added directly U4 (ULN2803) input terminal, cause YO~Y7 internal output U4 is low, so that the eight relays pull operation, and thus the normally open contact thereof JO~J7 all simultaneously closed, which would short-circuit the windings eight auto regulator will burn the entire regulator. 所以应该是任何时刻,要么JO〜J7全部断开,要么仅有一个为闭合状态,其余为断开状态。 So it should be at any time, either JO~J7 all off, or only a closed state, and the rest to the OFF state. 采用U2以后,就可以解决上电瞬间继电器全吸合的问题。 After the use of U2, you can solve the problem instantly relay the full power of pull. 单片机上电瞬间,U2的复位电路(RlO和C2)为U2的清零端)提供一个低有效上电复位信号,使U2的输出为全“O”(Q7〜Qq=00H=00000000B),从而使U4内部的8个OC门驱动器全部截止断开,进而使8个继电器全部断电,其8个常开接点J7〜JO不闭合,输出电压U0=O。 Instantaneous power microcontroller, the reset circuit U2 (and RlO to C2) provides a low-power-on reset signal to the clear terminal U2), the output of U2 is full "O" (Q7~Qq = 00H = 00000000B), whereby 8 so that the interior of U4 OC gate drive off all turned off, thereby enabling all eight relays de-energized, normally open contact 8 which J7~JO not closed, the output voltage of U0 = O.

[0023] 同时,Ul的复位电路(R9和Cl)为Ul的复位端(NRST)提供一个高有效上电复位信号使单片机复位,程序从初始化部分开始运行,首先立即向ro 口写入全“o”(ro=ooH),并经过PC7产生一个由低到高的电平变化,使U2的CLK端获得一个上升沿触发信号,从而将ro口数据(此时为8个全“O”)锁存进入到U2 (74LS273)的输出端(Q7〜Qq=OOH=OOOOOOOOB)。 [0023] Meanwhile, the reset circuit Ul (R9 and Cl) reset terminal of Ul (the NRST) provides a high efficient power-on reset signal and reset the device, the initialization part of the program starts to run from a first opening immediately written omnidirectional ro " o "(ro = ooH), and after a PC7 generated by the low to high level change, so that the CLK terminal U2 to obtain a rising edge of the trigger signal, so that the port data ro (in this case eight full" O ") latched into U2 (74LS273) output terminal (Q7~Qq = OOH = OOOOOOOOB).

[0024] 此后,单片机进入正常的工作循环。 [0024] Thereafter, the microcontroller enters the normal operating cycle. 对输入电压UI和输出电压UO进行检测和判断。 UI input voltage and the output voltage UO detection and determination. 并根据表2,通过单片机的ro 口输出数据,该驱动数据经U2和U4使得相应的继电器吸合,从而保持输出电压的稳定。 And according to Table 2, the data output by the microcontroller port ro, the U2 and U4 via the drive data so that the corresponding relay, thereby maintaining a constant output voltage.

[0025] 表2输入、输出电压与F1D 口输出数据关系表 [0025] Table 2 input, output voltage and output port data table F1D

Figure CN103294088AD00061

这样,当输入电压在173〜275V之间波动变化时,输出电压都能稳定在额定电压220V上。 Thus, when the input voltage fluctuation between 173~275V, the output voltage can be stabilized at the rated voltage of 220V.

[0026] 本发明不仅局限于上述具体实施方式,本领域一般技术人员根据本发明公开的内容,可以采用其它多种具体实施方式实施本发明,因此,凡是采用本发明的设计结构和思路,做一些简单的变化或更改的设计,都落入本发明保护的范围。 [0026] The present invention is not limited to the above specific embodiments, those of ordinary skill in light of the present disclosure, various other embodiments may employ specific embodiments of the present invention, therefore, the present invention all design ideas and structures do Some simple changes or changes in design, fall within the scope of the present invention.

Claims (4)

  1. 1.一种基于分段变截面绕组的抽头式自耦型交流稳压器,其特征在于,包括测量电路、主控电路、驱动电路、多个继电器和绕组; 测量电路用于测量稳压器的输入电压和输出电压,测量电路的输出端与主控电路相连,主控电路与驱动电路相连,驱动电路与多个继电器相连; 所述绕组为一具有多个抽头的绕组,所述多个抽头将绕组分为多个区段,所述每个区段的横截面面积各不相同;多个继电器分别与绕组的多个抽头相连,用于控制所述抽头的通断;多个继电器的常开触点连接在一起。 A variable cross-section segment based on a tapped autotransformer winding AC voltage regulator, characterized in that the measuring circuit comprises a main control circuit, a driving circuit, and a plurality of relay windings; measuring circuit for measuring a voltage regulator connected to the input voltage and the output voltage, the output of the measurement circuit main control circuit, connected to the main control circuit to the drive circuit, the drive circuit is connected to the plurality of relays; the winding is a winding having a plurality of taps, a plurality of tap winding into a plurality of segments, each segment of the cross-sectional area varies; a plurality of relays connected to a plurality of winding taps, respectively, for controlling the tap-off; a plurality of relays normally open contacts are connected together.
  2. 2.根据权利要求1所述的基于分段变截面绕组的抽头式自耦型交流稳压器,其特征在于,所述主控电路包括单片机、8D锁存器、闻有效上电复位电路、低有效上电复位电路和晶振电路,单片机与8D锁存器相连,高有效上电复位电路与单片机相连,低有效上电复位电路与8D锁存器相连,晶振电路与单片机相连,用于产生振荡信号给单片机。 According to claim 1, said variable cross-section segment based on a tapped autotransformer winding AC voltage regulator, characterized in that said control circuit comprises a microcontroller, 8D latch, smell active on reset circuit, low active on reset circuit and crystal oscillation circuit, coupled to the microcontroller and the latch 8D, high active connected with the microcontroller on reset circuit, connected to the active low power-on reset circuit and a latch 8D, coupled to the oscillator circuit to the microcontroller, for generating oscillation signal to the microcontroller.
  3. 3.根据权利要求2所述的基于分段变截面绕组的抽头式自耦型交流稳压器,其特征在于,所述单片机还与一显示器相连。 According to claim 2, said variable cross-section segment based on a tapped autotransformer winding AC voltage regulator, characterized in that the microcontroller is further connected to a display.
  4. 4.根据权利要求2所述的基于分段变截面绕组的抽头式自耦型交流稳压器,其特征在于,所述驱动电路包括一8通道的达林顿阵列。 The on-tap autotransformer AC regulator winding of the variable cross-section segment of claim 2, wherein said driving circuit comprises a Darlington array 8-channel.
CN 201310192164 2013-05-21 2013-05-21 Segmented variable-cross-section winding based tapped auto-coupling alternating-current voltage stabilizer CN103294088A (en)

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Cited By (1)

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CN105045325A (en) * 2015-06-29 2015-11-11 惠州市英华电源有限公司 High-precision AC voltage stabilization power supply

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US4520818A (en) * 1983-02-28 1985-06-04 Codman & Shurtleff, Inc. High dielectric output circuit for electrosurgical power source
CN2105748U (en) * 1991-11-06 1992-05-27 马振泰 Autoinductive coupling transformer for electric motor voltage reducing starter
WO1997003451A1 (en) * 1995-07-07 1997-01-30 Yeong Choon Chung Power saving apparatus using mutual inductive reactor
CN202486642U (en) * 2012-01-18 2012-10-10 中山市马迅电器有限公司 Novel alternating current voltage stabilizer
CN203250232U (en) * 2013-05-21 2013-10-23 浙江腾腾电气有限公司 Tapped self-coupling type alternating current stabilizer based on segmented variable-cross-section winding

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4520818A (en) * 1983-02-28 1985-06-04 Codman & Shurtleff, Inc. High dielectric output circuit for electrosurgical power source
CN2105748U (en) * 1991-11-06 1992-05-27 马振泰 Autoinductive coupling transformer for electric motor voltage reducing starter
WO1997003451A1 (en) * 1995-07-07 1997-01-30 Yeong Choon Chung Power saving apparatus using mutual inductive reactor
CN202486642U (en) * 2012-01-18 2012-10-10 中山市马迅电器有限公司 Novel alternating current voltage stabilizer
CN203250232U (en) * 2013-05-21 2013-10-23 浙江腾腾电气有限公司 Tapped self-coupling type alternating current stabilizer based on segmented variable-cross-section winding

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105045325A (en) * 2015-06-29 2015-11-11 惠州市英华电源有限公司 High-precision AC voltage stabilization power supply

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