CN111600493A - Inductance regulating circuit based on equal ratio series and transformer circuit thereof - Google Patents
Inductance regulating circuit based on equal ratio series and transformer circuit thereof Download PDFInfo
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- CN111600493A CN111600493A CN202010527116.6A CN202010527116A CN111600493A CN 111600493 A CN111600493 A CN 111600493A CN 202010527116 A CN202010527116 A CN 202010527116A CN 111600493 A CN111600493 A CN 111600493A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/06—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using impedances
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P13/00—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P13/00—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output
- H02P13/06—Arrangements for controlling transformers, reactors or choke coils, for the purpose of obtaining a desired output by tap-changing; by rearranging interconnections of windings
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Or Transformers For Communication (AREA)
- Ac-Ac Conversion (AREA)
Abstract
The invention discloses an inductance regulating circuit based on an equal-ratio series and a transformer circuit thereof. In the transformer application circuit, the secondary side coil windings of the transformer are sequentially connected in an equal ratio array mode, and each winding is connected with a switch to finish uniform and unique stable adjustable output with mutual exclusion.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to an inductance regulating circuit based on an equal ratio series and a transformer circuit thereof.
Background
Generally, the size of the electronic component can be adjusted by manual adjustment or in a series or parallel connection mode, but the cost of the adjustable inductor manufactured by the inductance component is higher due to the structure and manufacturing of the inductance component.
In many fields such as automatic control, it is often necessary to make the basic electronic components into a controllable and adjustable form to realize automatic and intelligent control, so as to meet the actual functional requirements of the electronic components in the circuits, and for this reason, digital electronic components are widely used in various circuits, but the existing digital electronic component applications still have many disadvantages, such as: the circuit is complex, and a large number of electronic components are required to be adopted for combined adjustment when a plurality of gears are adjusted; the adjusting range is small, the range difference of adjacent gears is large, and the high-precision adjusting requirement cannot be met.
The existing transformer circuit adopts a mechanical regulation mode, has low regulation speed, slow response, narrow regulation range, can not be continuously regulated, and can not finish uniform and unique mutually exclusive adjustable output.
Disclosure of Invention
In order to overcome the defects and shortcomings of the prior art, the invention provides an inductance regulating circuit based on an equal ratio sequence and a transformer circuit thereof. By controlling the switches, a uniform change in the magnitude of the inductance, including a gradual increase or decrease, is achieved. The method is easy to realize the automatic adjustable control of the inductance size, the secondary side coil windings of the transformer are sequentially connected in an equal ratio array mode through access in a transformer application circuit, and a switch is connected on each winding to finish uniform, unique and stable adjustable output with mutual exclusion, and the method has the characteristics of large adjustment range, high precision, quick dynamic response, simple structure and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an inductance regulating circuit based on geometric series connection, which comprises: a plurality of inductive elements and a plurality of inductive control switches;
the inductance elements are sequentially connected in series according to the geometric progression in the geometric progression, and two ends of each inductance element are connected with the inductance control switch in parallel;
the gear to be adjusted is converted into a binary system, the binary system is in one-to-one correspondence with binary bits from the high position to the low position of the switching value of the inductance control switch, and the ith inductance control switch S is controlled when the ith bit of the binary system of the gear is 1i-1On, when the ith bit is 0, the control isi inductive control switches Si-1The inductor control switches are disconnected and independently controlled respectively;
controlling the switch-off and switch-on of the inductance control switch to obtain the adjustable interval [ L ] of the inductance output end1，qn-1L1]Wherein L is1The first term inductance element in the geometric series is shown, and q represents the geometric coefficient of the geometric series.
Preferably, the geometric coefficient q of the geometric sequence is set to q-2, and the inductance elements are connected in series in order of the geometric sequence with the geometric coefficient q-2.
As a preferable technical scheme, the method is further provided with an initial inductance element, the initial inductance element is connected with the first inductance element or the last inductance element in the geometric progression in series, and the adjustable interval of the inductance output end is [ Ls + L ]1，Ls+qn-1L1]Where Ls denotes an inductance value of the initial inductance element.
As a preferable technical scheme, the inductance control switch adopts an automatic switch or a manual switch.
The invention also provides a transformer circuit based on an equal ratio number array winding, which adopts the inductance element to form a coil winding and comprises the following components: a primary side coil winding of the transformer, n coil windings of a secondary side of the transformer and n winding control switches;
the n coil windings on the secondary side of the transformer are sequentially connected in series according to the geometric progression in the geometric progression column, each winding control switch is connected with the coil winding on the secondary side of the transformer in parallel, the regulating winding control switches are switched off and switched on, and a plurality of uniformly-changed gears are obtained at the output end by regulating the switching value change of the winding control switches.
Preferably, the geometric coefficient q of the geometric series is set to q-2, and the secondary side coil windings of the transformer are sequentially connected in series according to the geometric series with the geometric coefficient q-2;
the change of the switching value of the switch is controlled by the winding, and the output end obtains (2)n-1) uniformly-changing gears, wherein the change interval of the output voltage value of the secondary side of the transformer is as follows: [ L ]1Uin，L1(2n-1)Uin]Wherein L is1First term, U, representing an equal ratio series windinginIndicating the voltage input value of the primary side coil.
As a preferable technical scheme, a transformer secondary side coil primary winding is further arranged, the transformer secondary side coil primary winding is connected in series with the first transformer secondary side coil winding or the last transformer secondary side coil winding in the geometric series,
the change interval of the secondary side output voltage value of the transformer is as follows: [ Ls + X ]1Uin，Ls+L1(qn-1)Uin]And Ls represents the number of turns of the primary winding of the secondary side coil of the transformer.
The invention also provides another transformer circuit based on an equal ratio number series winding, the coil winding is formed by adopting the inductance element, and the transformer adopts an autotransformer, which comprises: a primary side coil winding of the transformer, n coil windings of a secondary side of the transformer and n winding control switches;
n coil windings on the secondary side of the transformer are connected in series according to an equal ratio series sequence in the equal ratio series, each winding control switch is connected with the coil winding on the secondary side of the transformer in parallel,
the transformer secondary side coil primary winding is connected in series with the first transformer secondary side coil winding or the last transformer secondary side coil winding in the geometric series, the regulating winding controls the switch to be switched off and on, and a plurality of uniformly-changed gears are obtained at the output end by controlling the switching value of the switch to be changed through the regulating winding.
Preferably, the geometric coefficient q of the geometric series is set to q 2, and the secondary coil windings of the transformer are sequentially connected in series according to the geometric series with the geometric coefficient q of 2.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the invention converts n inductance elements of equal ratio array into the first term L1Are uniformly spaced, (2)n-1) inductors with adjustable size, which expands the application range of the inductor element.
(2) The invention overcomes the defect that the inductance element is difficult to adjust, has simple circuit, convenient and easy input control, can be manually adjusted and automatically controlled, has uniform and exclusive stability of the output inductance, and has wide application space.
(3) The invention connects the secondary side coil windings of the transformer in an equal ratio array mode, connects a switch on each winding, and obtains (2) at the output end by controlling the change of the switching valuen-1) evenly varying steps extending the voltage range of the secondary side output voltage of the transformer.
(4) The transformer circuit based on the equal-ratio series windings has the advantages of simple structure, convenient input control, uniform output interval and stable and reliable voltage value adjustment.
Drawings
Fig. 1 is a schematic diagram of the overall structure of an inductance adjusting circuit based on geometric series connection in this embodiment 1;
fig. 2 is a specific exemplary structure diagram of an inductance adjusting circuit based on geometric series connection according to the embodiment 1;
fig. 3 is a schematic structural diagram of a transformer circuit based on an equal ratio series winding according to the embodiment 2;
fig. 4 is a schematic structural diagram of the autotransformer circuit based on the equal ratio number series winding in this embodiment 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
Geometric series and geometric series: if a series of numbers starts from item 2 and the ratio of each item to its predecessor equals the same constant, the series is called an equal ratio series. This constant is called the common ratio of the series of equal ratios, which is usually denoted by the letter q, if the terms in the series of equal ratios are added in turn, SnIt is called an geometric progression.
As shown in fig. 1, in this embodiment, an inductance adjusting circuit based on geometric series connection is provided, in which n inductance elements at both ends are serially connected in the order of geometric series according to the geometric series with geometric coefficient q being 2, each inductance is connected in parallel with a control switch, and by controlling the change of the switching value at the input end, the inductance adjusting circuit can obtain (2) at the output endn-1) mutually exclusive unique uniformly changing inductors, and a control switch in the circuit can be an automatic switch or a manual switch.
The working principle is as follows: when the switch of the inductance element corresponding to the equal ratio array is closed, the inductance circuit corresponding to the switch is short-circuited, and the inductance corresponding to the closed switch is invalid; when the switch corresponding to the inductor is open, the closed switch is "active" with respect to the corresponding inductor element.
By controlling the opening and closing of the n switches, an adjustable interval [ L ] can be obtained at the output end1，2n-1L1]The size of the inductance of (2) varies. When the change of the switching value (high level and low level of the input control end) is continuously changed according to plus 1 or minus 1, the size of the output end inductance is gradually and uniformly reduced or increased, wherein the first term L of the geometric series1The minimum variation interval of the output quantity. In order to control the variation interval of the inductance, an inductance element with the size of Ls is connected in series in the circuit, so that the interval of the output quantity is [ Ls + L1，Ls+2n-1L1]An internal variation.
As shown in FIG. 2, this embodiment takes Ls0mH, 4 switches, and the first term L of the inductance of the proportional array1When 25mH is obtained, the magnitudes of the series connection combined inductors are respectively as follows: 20L1＝25mH，21L1＝50mH，22L1＝100mH，23L1According to the change of 4 switching values, 2 can be obtained at 200mH4The value of-1-15 inductance values (taking into account that the inductance is zero and meaningless, so the process of subtraction) changes from 25-375 mH, and the initial value is Ls-0 mH, so the change interval of the total inductance value is [25, 375mH]The variation interval is 25 mH. The inductance regulating circuit based on the geometric series connection of the embodiment refines the inductanceThe variation precision is realized by converting 4 fixed inductance elements into 15 exclusive unique uniformly adjustable inductances; as shown in table 1 below, when the switching value is 1, it indicates that the switch corresponding to the inductance element in the equal-ratio sequence is closed, and when the switching value is 0, it indicates that the switch corresponding to the inductance element in the equal-ratio sequence is open, and the inductance of the output end gradually decreases with the gradual increase of the binary number of the switching value of the input end.
TABLE 1 inductance input/output control state table
As can be seen from the above table, according to the working principle of the geometric progression circuit, the initial inductance Ls, the number of switches n and the first inductance L of the geometric progression are selected reasonably1The value and the change of the inductance in the design interval can be realized.
Example 2
The embodiment provides a transformer circuit based on an equal ratio number array winding, which comprises: the transformer secondary side coil windings are connected by adopting the inductor in the embodiment 1, the transformer secondary side coil windings are formed by connecting the n coil windings in series according to an equal ratio sequence with an equal ratio coefficient q being 2 according to an equal ratio series, each transformer secondary side coil winding is connected with a switch in parallel, the control module controls the switches to be switched off and on, and the (2) is obtained at the output end by controlling the change of the switching value of the switchesn-1) uniformly-changing gears, wherein the change interval of the output voltage value of the secondary side of the transformer is as follows: [ L ]1Uin，L1(2n-1)Uin]Implementing a tunable output of uniform unique mutexes, where L1First term, U, representing an equal ratio series windinginA voltage input value representing a primary side coil;
the high order to the low order of the switch is represented as binary system and converted into decimal system and hexadecimal system, the high order to the low order of the switch are respectively corresponding to the high order to the low order of the item number of the secondary side coil winding of the transformer, when the gear is adjusted, the control module is used for changing the switch by receiving the item numberThe regulation control instruction of the secondary side coil winding of the transformer converts the gear (decimal system) to be regulated into n-bit binary system, the n-bit binary system is in one-to-one correspondence with the binary bits from the high bit to the low bit of the switch, and the ith bit of the binary system of the gear controls the ith switch S when the ith bit is 1i-1On, i bit is 0 to control i switch Si-1And in a disconnection mode, the n switches are respectively and independently controlled, when the change of the switching value is continuously changed according to plus 1 or minus 1, the voltage of the secondary side output end of the transformer circuit is gradually and uniformly increased or reduced, and the automatic adjustment of the voltage range of the secondary side output end of the transformer circuit is realized.
Wherein the first term L of the geometric series1In order to control the variation interval of the secondary side output end of the transformer in the circuit for the minimum variation interval proportion of the output quantity, the implementation can be connected with a secondary side coil winding of the transformer with the size of Ls in series to be used as the primary winding of the secondary side coil of the transformer, so that the interval of the output quantity is in the range of [ Ls + L [1Uin，Ls+L1(2n-1)Uin]An internal variation.
The switch in the circuit of the embodiment can be an automatic switch, such as a relay, an IGBT (insulated gate bipolar transistor), a thyristor and the like, and can also be a manual switch, such as a mechanical switch, namely, a mode of controlling without a control module and manual regulation.
As shown in fig. 3, in the present embodiment, the number of turns N of the primary side coil of the transformer circuit based on the equal ratio array winding is described, and Ls is 0, and N is 3 switches as an example:
first term L of equal ratio number series winding1When the number of turns is 0.1N, the size of the secondary side coil combined winding of the transformer is as follows: 20L10.1N (turns), 21L10.2N (turns), 22L1The output end of the transformer can obtain 2 according to the input change of 3 switching values, namely 0.4N (turns)3-1-7 uniformly varying output voltages;
since the initial value Ls is 0 (number of turns), the variation interval of the secondary side coil voltage value is [0.1U ]in，0.7Uin]Adjustable voltage interval 0.1Uin(V)。
According to the circuit operating characteristics, as shown in Table 2 below, the output voltage in the frame of the table is 0.1UinAnd the voltage of the output end is gradually reduced along with the gradual increase of the binary number of the switching value of the input end.
TABLE 2 input/output control state table for coil turns
Example 3
This embodiment provides a transformer circuit based on equal ratio number series windings, in which, the transformer uses an autotransformer, the primary side input terminal is connected with 220V ac, the secondary side coil winding uses the inductor in the above embodiment 1 to connect, the number of turns of the coil is arranged in equal ratio number series, and is connected with a switch.
As shown in fig. 4, the number of turns N of the primary winding, where N is 4 switches, is equal to the first term L of the proportional series winding1N (number of turns), the size of the transformer secondary coil combined winding is: 20 L 11N (number of turns), 21 L 12N (turns), 22 L 14N (turns), 23 L 12 is obtained on the secondary side according to the input change of 4 switching values, namely 8N (turns)416 uniformly varying winding variations;
in this embodiment, the initial value is Ls which is 2.6N (turns), the primary fixed winding is 14.6N, the variation interval of the secondary adjustable winding is [2.6N, 17.6N ], the minimum uniform spacing winding variation amount is N (turns), and according to the operating characteristics of the transformer, the voltage value of the secondary side end which uniformly varies each time is (1/14.6) × 220 ≈ 15V, and the secondary output voltage interval [40V, 265V ], as shown in table 3 below, the voltage of the output end of the autotransformer gradually decreases with the gradual increase of the binary number of the switching value.
TABLE 3 autotransformer I/O STATE TABLE
In summary, the initial winding Ls (number of turns), the number of switches n and the first term L of the geometric progression are reasonably selected according to the working principle of the geometric progression circuit of the inductor1The number of turns can realize the uniform and stable output of adjustable voltage values of various transformers in a design interval.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (9)
1. An inductance adjustment circuit based on an equal ratio sequence connection, comprising: a plurality of inductive elements and a plurality of inductive control switches;
the inductance elements are sequentially connected in series according to the geometric progression in the geometric progression, and two ends of each inductance element are connected with the inductance control switch in parallel;
the gear to be adjusted is converted into a binary system, the binary system is in one-to-one correspondence with binary bits from the high position to the low position of the switching value of the inductance control switch, and the ith inductance control switch S is controlled when the ith bit of the binary system of the gear is 1i-1When the ith position is 0, the ith inductance control switch S is controlledi-1The inductor control switches are disconnected and independently controlled respectively;
controlling the switch-off and switch-on of the inductance control switch to obtain the adjustable interval [ L ] of the inductance output end1，qn-1L1]Wherein L is1The first term inductance element in the geometric series is shown, and q represents the geometric coefficient of the geometric series.
2. The inductance adjustment circuit connected based on the geometric progression according to claim 1, wherein a geometric coefficient q of the geometric progression is set to q-2, and the inductance elements are connected in series in order of the geometric progression with the geometric coefficient q-2.
3. The method of claim 1 or 2The inductance regulating circuit based on the geometric series connection is characterized by further comprising an initial inductance element, wherein the initial inductance element is connected with the first inductance element or the last inductance element in the geometric series in series, and the adjustable interval of the inductance output end is [ Ls + L ]1，Ls+qn-1L1]Where Ls denotes an inductance value of the initial inductance element.
4. The transformer circuit based on the equal-ratio number sequence windings according to claim 1, characterized in that the inductance control switch adopts an automatic switch or a manual switch.
5. A transformer circuit based on an equal ratio number array winding, using the inductance element of claim 1 to form a coil winding, comprising: a primary side coil winding of the transformer, n coil windings of a secondary side of the transformer and n winding control switches;
the n coil windings on the secondary side of the transformer are sequentially connected in series according to the geometric progression in the geometric progression column, each winding control switch is connected with the coil winding on the secondary side of the transformer in parallel, the regulating winding control switches are switched off and switched on, and a plurality of uniformly-changed gears are obtained at the output end by regulating the switching value change of the winding control switches.
6. The transformer circuit based on the equal ratio sequence windings as claimed in claim 5, wherein the equal ratio coefficient q of the equal ratio sequence is set as q-2, and the secondary side coil windings of the transformer are connected in series according to the equal ratio sequence with the equal ratio coefficient q-2;
the change of the switching value of the switch is controlled by the winding, and the output end obtains (2)n-1) uniformly-changing gears, wherein the change interval of the output voltage value of the secondary side of the transformer is as follows: [ L ]1Uin，L1(2n-1)Uin]Wherein L is1First term, U, representing an equal ratio series windinginIndicating the voltage input value of the primary side coil.
7. The transformer circuit based on the geometric series winding of claim 5 or 6, characterized in that a primary winding of a secondary side coil of a transformer is provided, the primary winding of the secondary side coil of the transformer is connected in series with the first secondary side coil winding or the last secondary side coil winding of the transformer in the geometric series,
the change interval of the secondary side output voltage value of the transformer is as follows: [ Ls + X ]1Uin，Ls+L1(qn-1)Uin]And Ls represents the number of turns of the primary winding of the secondary side coil of the transformer.
8. A transformer circuit based on an equal ratio number array winding, using the inductance component of claim 1 to form a coil winding, wherein the transformer is an autotransformer, comprising: a primary side coil winding of the transformer, n coil windings of a secondary side of the transformer and n winding control switches;
n coil windings on the secondary side of the transformer are connected in series according to an equal ratio series sequence in the equal ratio series, and each winding control switch is connected with the coil winding on the secondary side of the transformer in parallel;
the transformer secondary side coil primary winding is connected in series with the first transformer secondary side coil winding or the last transformer secondary side coil winding in the geometric series, the regulating winding controls the switch to be switched off and on, and a plurality of uniformly-changed gears are obtained at the output end by controlling the switching value of the switch to be changed through the regulating winding.
9. The transformer circuit based on the equal-ratio array winding of claim 8, wherein the equal-ratio coefficient q of the equal-ratio array is set to be q-2, and the secondary side coil windings of the transformer are sequentially connected in series according to the equal-ratio array with the equal-ratio coefficient q-2.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022088402A1 (en) * | 2020-10-29 | 2022-05-05 | 合肥科威尔电源系统股份有限公司 | Adjustable reactor and equal-step adjustment method therefor |
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| CN108712085A (en) * | 2018-05-03 | 2018-10-26 | 中国电力科学研究院有限公司 | A kind of system and method for the secondary voltage of adjustment transformer |
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2020
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| CN2245230Y (en) * | 1995-12-16 | 1997-01-15 | 顾元章 | Voltage regulator for ac manostat controlled by digital code |
| CN201947256U (en) * | 2011-04-06 | 2011-08-24 | 北京盛矽科技有限公司 | Adjustable RF circuit |
| US20140009248A1 (en) * | 2012-07-05 | 2014-01-09 | Rf Micro Devices, Inc. | Spac series programmable array of capacitors |
| CN105897225A (en) * | 2016-04-29 | 2016-08-24 | 国网福建省电力有限公司 | High-amplitude multi-state single-sequence waveform controllable output device and method |
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| WO2022088402A1 (en) * | 2020-10-29 | 2022-05-05 | 合肥科威尔电源系统股份有限公司 | Adjustable reactor and equal-step adjustment method therefor |
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Application publication date: 20200828 |