CN111338412A - Alternating current voltage stabilizer and alternating current voltage stabilizing equipment - Google Patents
Alternating current voltage stabilizer and alternating current voltage stabilizing equipment Download PDFInfo
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- CN111338412A CN111338412A CN202010241637.5A CN202010241637A CN111338412A CN 111338412 A CN111338412 A CN 111338412A CN 202010241637 A CN202010241637 A CN 202010241637A CN 111338412 A CN111338412 A CN 111338412A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
- G05F1/14—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using tap transformers or tap changing inductors as final control devices
- G05F1/16—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using tap transformers or tap changing inductors as final control devices combined with discharge tubes or semiconductor devices
- G05F1/20—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using tap transformers or tap changing inductors as final control devices combined with discharge tubes or semiconductor devices semiconductor devices only
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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
- H02M5/12—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 for conversion of voltage or current amplitude only
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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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Abstract
The invention is suitable for the technical field of voltage stabilization, and provides an alternating current voltage stabilizer and alternating current voltage stabilizing equipment, wherein the alternating current voltage stabilizer comprises: a tap gating circuit and a multi-tap mutual inductance transformer; the multiple taps of the multi-tap mutual inductance transformer are arranged on the primary winding of the multi-tap mutual inductance transformer; one end of a secondary winding of the multi-tap mutual inductance transformer is used for being connected with a live wire end of an alternating current input, and the other end of the secondary winding of the multi-tap mutual inductance transformer is used for being connected with a load; the other end of the secondary winding is also connected with the zero line end of the alternating current input through the tap gating circuit. The tap gating circuit comprises a plurality of controllable switch branches connected in parallel, the number of the controllable switch branches is consistent with that of taps of the primary winding, each controllable switch branch comprises two controllable switches connected in series, and each tap of the primary winding is correspondingly connected between the two controllable switches of one controllable switch branch. The invention can reduce the cost of the alternating current voltage stabilizer.
Description
Technical Field
The invention belongs to the technical field of voltage stabilization, and particularly relates to an alternating current voltage stabilizer and alternating current voltage stabilizing equipment.
Background
The ac voltage stabilizer is widely used in various industries for stabilizing an input ac voltage, the existing ac voltage stabilizer generally includes a plurality of independent compensation transformers, different compensation voltages can be obtained by combination of different modes of each compensation transformer among the plurality of independent compensation transformers, and when stabilizing the voltage, a corresponding compensation transformer is selected according to a required compensation voltage to perform voltage compensation, thereby realizing voltage stabilization of the input ac voltage, however, since the existing ac voltage stabilizer includes a plurality of compensation transformers, and the cost of the compensation transformer is high, thereby resulting in a high cost of the ac voltage stabilizer.
Disclosure of Invention
In view of this, the present invention provides an ac voltage stabilizer and an ac voltage stabilizing device, and aims to solve the problem of high cost of the ac voltage stabilizer in the prior art.
A first aspect of an embodiment of the present invention provides an ac voltage regulator, including:
a tap gating circuit and a multi-tap mutual inductance transformer;
the multiple taps of the multi-tap mutual inductance transformer are arranged on the primary winding of the multi-tap mutual inductance transformer;
one end of a secondary winding of the multi-tap mutual inductance transformer is used for being connected with a live wire end of an alternating current input, and the other end of the secondary winding of the multi-tap mutual inductance transformer is used for being connected with a load;
the other end of the secondary winding is also connected with a zero line end of the alternating current input through the tap gating circuit;
the tap gating circuit comprises a plurality of controllable switch branches connected in parallel, the number of the controllable switch branches is consistent with that of taps of the primary winding, each controllable switch branch comprises two controllable switches connected in series, and each tap of the primary winding is correspondingly connected between the two controllable switches of one controllable switch branch;
when the tap gating circuit works, the actual working turns of the primary winding are adjusted by controlling the switching state of each controllable switch in the tap gating circuit, so that the secondary winding provides corresponding specified compensation voltage.
Optionally, the step of adjusting the actual number of working turns of the primary winding by controlling the switching state of each controllable switch in the tap gating circuit by using a controllable switch connected to the zero line end in each controllable switch branch as a second controllable switch and another controllable switch as a first controllable switch includes the steps of:
and controlling a first controllable switch in each controllable switch branch to be conducted, and controlling a second controllable switch in each controllable switch branch to be conducted, wherein the conducted first controllable switch and the conducted second controllable switch do not belong to the same controllable switch branch, and the number of turns between a tap connected with the conducted first controllable switch and a tap connected with the conducted second controllable switch is the actual working number of turns.
Optionally, in operation, a specified voltage is applied between a tap connected to the first controllable switch and a tap connected to the second controllable switch, the specified voltage induces the secondary winding to generate the specified compensation voltage, the specified compensation voltage is equal to a quotient of the specified voltage and an actual transformation ratio of the multi-tap mutual inductance transformer, and the actual transformation ratio of the multi-tap mutual inductance transformer is a ratio of the actual number of turns of the secondary winding to the actual number of turns of the working winding.
Optionally, an overcurrent protection module is further connected between the other end of the secondary winding and the tap gating circuit.
Optionally, the tap gating circuit comprises 6 controllable switching branches connected in parallel, and the primary winding of the multi-tap mutual inductance transformer comprises 6 taps.
Optionally, the 6 taps are a first tap, a second tap, a third tap, a fourth tap, a fifth tap and a sixth tap in sequence;
when the number of turns between the first tap and the sixth tap is the actual number of working turns, the actual transformation ratio of the multi-tap mutual inductance transformer is 1100: 22;
when the number of turns between the first tap and the fifth tap is the actual number of working turns, the actual transformation ratio of the multi-tap mutual inductance transformer is 550: 22;
when the number of turns between the first tap and the fourth tap is the actual number of working turns, the actual transformation ratio of the multi-tap mutual inductance transformer is 336: 22;
when the number of turns between the first tap and the third tap is the actual number of working turns, the actual transformation ratio of the multi-tap mutual inductance transformer is 275: 22;
when the number of turns between the first tap and the second tap is the actual number of working turns, the actual transformation ratio of the multi-tap mutual inductance transformer is 220: 22.
optionally, the primary winding is wound by a copper wire, and the secondary winding is wound by an aluminum foil.
Optionally, the controllable switch comprises a triac, a relay or an insulated gate bipolar transistor. .
A second aspect of an embodiment of the present invention provides an ac voltage stabilizing apparatus, including an isolation transformer for converting an input first ac voltage into a second ac voltage, and an ac voltage regulator as described in any one of the above, the ac voltage regulator being connected to the isolation transformer for stabilizing the second ac voltage at a preset value and outputting the second ac voltage to a load.
Optionally, when the isolation transformer is a three-phase output, each phase output is connected to one of the ac voltage regulators.
Compared with the prior art, the invention has the following beneficial effects:
the alternating current voltage stabilizer comprises a tap gating circuit and a multi-tap mutual inductance transformer, wherein multiple taps of the multi-tap mutual inductance transformer are arranged on a primary winding of the multi-tap mutual inductance transformer; the tap gating circuit comprises a plurality of controllable switch branches connected in parallel, the number of the controllable switch branches is consistent with the tap number of the primary winding, each controllable switch branch comprises two controllable switches connected in series, and when the tap gating circuit works, the on-off state of each controllable switch is controlled only, and the actual working turns of the primary winding are adjusted, so that the secondary winding provides corresponding specified compensation voltage. Because the invention comprises the multi-tap mutual inductance transformer, each tap is correspondingly connected between the two controllable switches of one controllable switch branch, the appointed compensation voltage can be obtained by controlling the switch state of each controllable switch, and a plurality of compensation transformers are not required to be combined, thereby reducing the number of the compensation transformers, and further reducing the cost and the occupied space of the alternating current voltage stabilizer.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic diagram of an AC voltage regulator including an autotransformer provided in the prior art;
FIG. 2 is a schematic diagram of an AC voltage regulator including a plurality of independent compensation transformers according to the prior art;
fig. 3 is a schematic structural diagram of an ac voltage regulator according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an ac voltage regulator according to another embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
The existing alternating current voltage stabilizer generally comprises an autotransformer or a plurality of independent compensation transformers, the autotransformer divides the output voltage into a plurality of gears, the on-off state of a thyristor is adjusted according to the required compensation voltage, and different compensation voltages are output, but the autotransformer is easy to cause the situation that the autotransformer flows through full load power due to the autotransformer and the thyristor connection structure, so that the heat dissipation is difficult. Referring to fig. 1, a schematic diagram of a prior art voltage compensation using an autotransformer is shown. The low-voltage side of the isolation transformer outputs 220V alternating voltage, the autotransformer divides the output voltage of the autotransformer into a plurality of gears by utilizing a plurality of taps, the thyristor SCR on the corresponding tap is selected to be conducted according to the fluctuation condition of 220V, the voltage of the corresponding gear is output to perform voltage compensation, but the autotransformer and the thyristor flow full-load power, the type selection of the device power is not good, and the heat dissipation is difficult.
The combination of different modes of each compensating transformer among a plurality of independent compensating transformers can obtain different compensation voltage among the prior art, when steady voltage, selects corresponding compensating transformer according to required compensation voltage and carries out voltage compensation to the realization is to the steady voltage of the alternating voltage of input, because including a plurality of compensating transformers in the current alternating voltage regulator, and compensating transformer's cost is higher, and then leads to the cost of alternating voltage regulator higher. Referring to fig. 2, the ac voltage regulator in fig. 2 includes a large number of compensation transformers T1, T2, and T3, which results in a high cost of the ac voltage regulator.
The invention comprises a multi-tap mutual inductance transformer, each tap is correspondingly connected between two controllable switches of a controllable switch branch, and the appointed compensation voltage can be obtained by controlling the switch state of each controllable switch without combining a plurality of compensation transformers. In addition, the invention utilizes the connection structure of the multi-tap mutual inductance transformer and the tap gating circuit to lead the secondary winding to flow large current and the primary winding to flow small current. Can realize small loss and is beneficial to natural heat dissipation.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following description is made by way of specific embodiments with reference to the accompanying drawings.
Referring to fig. 3, a schematic diagram of the structure of the ac voltage regulator according to the embodiment of the present invention is shown, and the detailed description is as follows:
the ac voltage regulator 1 includes:
a tap gating circuit 12 and a multi-tap mutual inductance transformer 11;
the multi-tap of the multi-tap mutual inductance transformer 11 is arranged on the primary winding thereof;
one end Lin of a secondary winding of the multi-tap mutual inductance transformer 11 is used for being connected with a live wire end of alternating current input, and the other end Lout is used for being connected with a load;
the other end Lout of the secondary winding is also connected with a zero line end N of the alternating current input through a tap gating circuit 12;
the tap gating circuit 12 comprises a plurality of controllable switch branches connected in parallel, the number of the controllable switch branches is consistent with that of taps of the primary winding, wherein each controllable switch branch comprises two controllable switches connected in series, and each tap of the primary winding is correspondingly connected between the two controllable switches of one controllable switch branch;
during operation, the actual number of turns of the primary winding is adjusted by controlling the switching state of each controllable switch in the tap gating circuit 12, so that the secondary winding provides a corresponding specified compensation voltage.
In the embodiment of the invention, referring to fig. 3, 380V ac outputs 220V ac voltage through the isolation transformer, the 220V ac voltage is an ac input of the ac voltage regulator, Lin is an ac input end of the multi-tap transformer, Lout is used for connecting a load, N is a zero line of the ac input, and N in fig. 3 is an integer greater than 2 and is an even number.
When the 220V alternating voltage of the alternating current input is unstable, the alternating current voltage stabilizer works to compensate the voltage of the 220V alternating voltage of the alternating current input, so that the alternating current voltage is stabilized.
The alternating current voltage stabilizer comprises a multi-tap mutual inductance transformer and a tap gating circuit, wherein multiple taps of the multi-tap mutual inductance transformer are arranged on a primary winding of the multi-tap mutual inductance transformer; the tap gating circuit comprises a plurality of controllable switch branches connected in parallel, the number of the controllable switch branches is consistent with the tap number of the primary winding, each controllable switch branch comprises two controllable switches connected in series, and when the tap gating circuit works, the on-off state of each controllable switch is controlled only, and the actual working turns of the primary winding are adjusted, so that the secondary winding provides corresponding specified compensation voltage. Because the invention includes a multi-tap mutual inductance transformer, each tap is correspondingly connected between two controllable switches of a controllable switch branch, on one hand, the appointed compensation voltage can be obtained by controlling the switch state of each controllable switch, and a plurality of compensation transformers are not required to be combined, thereby reducing the number of the compensation transformers, and further reducing the cost and the occupied space of the alternating current voltage stabilizer; on the other hand, when the voltage stabilizing range of the alternating current voltage stabilizer is expanded, the voltage stabilizing range can be expanded only by changing the number of turns of the primary winding, the number of taps and the number of controllable switch branches, a new compensation transformer can be prevented from being added, the number of the compensation transformers is reduced, and the expanded alternating current voltage stabilizer occupies a small space.
In addition, the invention utilizes the connection structure of the multi-tap mutual inductance transformer and the tap gating circuit to lead the secondary winding to flow large current and the primary winding to flow small current. The invention can realize small loss, and is more beneficial to natural heat dissipation compared with the voltage stabilizing structure of the autotransformer in the prior art.
Optionally, the step of adjusting the actual number of working turns of the primary winding by controlling the switching state of each controllable switch in the tap gating circuit by using a controllable switch connected to the zero line end in each controllable switch branch as a second controllable switch and another controllable switch as a first controllable switch includes the steps of:
and controlling a first controllable switch in each controllable switch branch to be conducted, and controlling a second controllable switch in each controllable switch branch to be conducted, wherein the conducted first controllable switch and the conducted second controllable switch do not belong to the same controllable switch branch, and the number of turns between a tap connected with the conducted first controllable switch and a tap connected with the conducted second controllable switch is the actual working number of turns.
In the embodiment of the invention, during operation, only one first controllable switch and one corresponding second controllable switch are conducted, so that the number of turns of the primary winding between the conducted first controllable switch and the conducted second controllable switch is adjusted to be the actual number of turns, and the actual number of turns determines the transformation ratio of the alternating current voltage stabilizer. The specified compensation voltage can determine the actual number of turns in operation, i.e. determine the two taps in operation, and the direction of the specified compensation voltage can determine the one first controllable switch and the one second controllable switch that are open.
When the alternating current voltage stabilizer in the prior art comprises a plurality of independent compensation transformers, different modes of combination are required to be carried out on each independent compensation transformer, the control logic is complex, the actual working turns of the primary winding can be adjusted by controlling one first controllable switch and one second controllable switch, and the alternating current voltage stabilizer is simple in logic structure and adjusting method and easy to operate.
Optionally, in operation, a specified voltage is applied between a tap connected to the first controllable switch and a tap connected to the second controllable switch, the specified voltage induces the secondary winding to generate the specified compensation voltage, the specified compensation voltage is equal to a quotient of the specified voltage and an actual transformation ratio of the multi-tap mutual inductance transformer, and the actual transformation ratio of the multi-tap mutual inductance transformer is a ratio of the actual number of turns of the secondary winding to the actual number of turns of the working winding.
In the embodiment of the present invention, the specified voltage may be 220V ac voltage, the primary winding of the multi-tap transformer can induce voltage in the secondary winding after applying 220V ac voltage, when one first controllable switch and one second controllable switch are controlled to be turned on, 220V ac voltage is applied between one tap connected to the turned on first controllable switch and one tap connected to the turned on second controllable switch, and the 220V voltage induces the specified compensation voltage to the secondary winding, because the voltage transformation ratio and the turn number transformation ratio of the multi-tap transformer are the same, the specified compensation voltage is equal to the quotient of the specified voltage and the actual transformation ratio of the multi-tap mutual transformer, and the actual transformation ratio of the multi-tap mutual transformer is the ratio of the actual operating turn number and the turn number of the secondary winding.
Referring to fig. 4, a schematic diagram of an ac voltage regulator according to another embodiment of the present invention is shown, which is detailed as follows:
the tap gating circuit comprises 6 controllable switching branches connected in parallel, and the primary winding of the multi-tap mutual inductance transformer comprises 6 taps.
In the embodiment of the invention, the number of the taps is the same as that of the controllable switch branches, and both the number of the taps and the number of the controllable switch branches are integers more than 2.
In the embodiment of the present invention, the multi-tap transformer 11 includes 6 taps, i.e., taps C1, C2, C3, C4, C5, and C6. Correspondingly, the tap gating circuit 12 comprises 6 controllable switch branches, each controllable switch branch comprising two controllable switches in series, the first controllable switch branch comprising controllable switches k1 and k2 in series, the second controllable switch branch comprising controllable switches k3 and k4 in series, the third controllable switch branch comprising controllable switches k5 and k6 in series, the fourth controllable switch branch comprising controllable switches k7 and k8 in series, the fifth controllable switch branch comprising controllable switches k9 and k10 in series, and the sixth controllable switch branch comprising controllable switches k11 and k12 in series.
Referring to fig. 4, the 6 taps are a first tap, a second tap, a third tap, a fourth tap, a fifth tap and a sixth tap in sequence;
when the number of turns between the first tap and the sixth tap is the actual number of working turns, the actual transformation ratio of the multi-tap mutual inductance transformer is 1100: 22;
when the number of turns between the first tap and the fifth tap is the actual number of working turns, the actual transformation ratio of the multi-tap mutual inductance transformer is 550: 22;
when the number of turns between the first tap and the fourth tap is the actual number of working turns, the actual transformation ratio of the multi-tap mutual inductance transformer is 336: 22;
when the number of turns between the first tap and the third tap is the actual number of working turns, the actual transformation ratio of the multi-tap mutual inductance transformer is 275: 22;
when the number of turns between the first tap and the second tap is the actual number of working turns, the actual transformation ratio of the multi-tap mutual inductance transformer is 220: 22.
in the embodiment of the invention, the voltage of the alternating current input comprises 220V, 230V and 380V, and when the number of turns between the first tap and the sixth tap is the actual working number of turns, the actual transformation ratio of the multi-tap mutual inductance transformer is 1100: 22; when the number of turns between the first tap and the fifth tap is the actual number of working turns, the actual transformation ratio of the multi-tap mutual inductance transformer is 550: 22; when the number of turns between the first tap and the fourth tap is the actual number of working turns, the actual transformation ratio of the multi-tap mutual inductance transformer is 336: 22; when the number of turns between the first tap and the third tap is the actual number of working turns, the actual transformation ratio of the multi-tap mutual inductance transformer is 275: 22; when the number of turns between the first tap and the second tap is the actual number of working turns, the actual transformation ratio of the multi-tap mutual inductance transformer is 220: 22. the turns of the primary winding between taps are different and the transformation ratio of the multi-tap transformer is different.
In the embodiment of the present invention, the actual number of working turns of the primary winding of the multi-tap transformer 11 can be adjusted by controlling the switching state of each controllable switch in the tap gating branch 12, so that the secondary winding provides the corresponding specified compensation voltage.
Illustratively, the first tap is C1, the second tap is C2, the third tap is C3, the fourth tap is C4, the fifth tap is C5, and the sixth tap is C6. The number of turns of the primary winding between the first tap C1 and the second tap C2 is 220, the number of turns of the primary winding between the second tap C2 and the third tap C3 is 55, the number of turns of the primary winding between the third tap C3 and the fourth tap C4 is 91, the number of turns of the primary winding between the fourth tap C4 and the fifth tap C5 is 184, the number of turns of the primary winding between the fifth tap C5 and the sixth tap C6 is 550, and the number of turns of the secondary winding is 22.
The primary winding of the multi-tap transformer is added with 220V alternating voltage, the required stability precision is 4.4V, the unit voltage adjustment amount of the structure is 4.4V, and the ratio of the transformation ratio of the primary winding between the first tap C1 and each of the remaining taps is arranged in the order from small to large: 1:2:3:4:5, wherein the voltage transformation ratio of the primary winding to the secondary winding between the first tap C1 and the sixth tap C6 is 220: 4.4, the actual turns ratio is 1100: 22, the voltage transformation ratio of the primary winding to the secondary winding between the first tap C1 and the fifth tap C5 is 220: 8.8, the actual turns ratio is 550: 22, the voltage transformation ratio of the primary winding to the secondary winding between the first tap C1 and the fourth tap C4 is 220: 13.2, the actual turns ratio is 366: 22, the voltage transformation ratio of the primary winding to the secondary winding between the first tap C1 and the third tap C3 is 220: 17.6, the actual turns ratio is 275: 22, the voltage transformation ratio of the primary winding to the secondary winding between the first tap C1 and the second tap C2 is 220: 22, actual turns ratio is 220: 22. when the ac regulator performs voltage stabilization, the opening rule of each controllable switch is shown in table 1 below, where "√" denotes that the controllable switch is opened.
TABLE 1
Table 1 shows that when the regulator compensates for-22V, the controllable switches k2 and k3 are open, when the regulator compensates for-17.6V, the controllable switches k2 and k5 are open, when the regulator compensates for-13.2V, the controllable switches k2 and k7 are open, when the regulator compensates for-8.8V, the controllable switches k2 and k9 are open, when the regulator compensates for-4.4V, the controllable switches k2 and k11 are open, when the regulator compensates for 4.4V, the controllable switches k1 and k12 are open, when the regulator compensates for 8.8V, the controllable switches k1 and k10 are open, when the compensation regulator compensates for 13.2V, the controllable switches k1 and k8 are open, and when the regulator compensates for 17.6V, the controllable switches k1 and k6 are open, and when the regulator compensates for-22V, the controllable switches k1 and k4 are open.
Optionally, an overcurrent protection module is further connected between the other end of the secondary winding and the tap gating circuit.
In the embodiment of the present invention, the overcurrent protection module may include a fuse or a circuit breaker to perform an overcurrent protection function when a controllable switch in the multi-tap gating circuit is adjusted.
The problem that the controllable switches in the multi-tap gating circuit are burnt out due to overlarge current flowing through the controllable switches because the controllable switches are not adjusted timely is avoided.
Optionally, the primary winding is wound by a copper wire, and the secondary winding is wound by an aluminum foil.
In the embodiment of the invention, the ductility of the copper wire during manufacturing is enhanced, and the aluminum foil winding can enable the secondary winding to bear large current carrying.
Optionally, the controllable switch comprises a triac, a relay or an insulated gate bipolar transistor.
In the embodiment of the invention, the controllable switch can comprise a bidirectional thyristor, a relay or an insulated gate bipolar transistor, and the bidirectional thyristor is used for realizing the control of two directions, so that the direction of the specified voltage applied by the primary winding is easy to control, and the direction of the specified compensation voltage induced by the secondary winding is further controlled.
The invention provides an alternating current voltage stabilizing device which comprises an isolation transformer and the alternating current voltage stabilizer, wherein the isolation transformer is used for converting an input first alternating current voltage into a second alternating current voltage, and the alternating current voltage stabilizer is connected with the isolation transformer and is used for stabilizing the second alternating current voltage at a preset value and outputting the second alternating current voltage to a load.
In the embodiment of the present invention, referring to fig. 4, the ac voltage apparatus may include an isolation transformer, which is disposed between the grid and the ac voltage regulator, and is used for performing an isolation function to convert 380V ac voltage input by the grid into 220V ac voltage, and the ac voltage regulator stabilizes the 220V ac voltage at 220V ac voltage and outputs the stabilized 220V ac voltage to the load.
Optionally, when the isolation transformer is a three-phase output, each phase output is connected to one of the ac voltage regulators.
In an embodiment of the invention, the isolation transformer may comprise a three-phase transformer, each phase output of which is connected to any one of the ac voltage regulators.
In the embodiment of the invention, when the voltage stabilizing value of the AC voltage stabilizer is expanded, only the number of coils and the number of taps of the multi-tap transformer need to be modified, while when the voltage stabilizing value of the AC voltage stabilizer in the prior art is expanded, the number of compensation transformers needs to be increased, so that the cost of expansion is increased.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. An ac voltage regulator, comprising:
a tap gating circuit and a multi-tap mutual inductance transformer;
the multiple taps of the multi-tap mutual inductance transformer are arranged on the primary winding of the multi-tap mutual inductance transformer;
one end of a secondary winding of the multi-tap mutual inductance transformer is used for being connected with a live wire end of an alternating current input, and the other end of the secondary winding of the multi-tap mutual inductance transformer is used for being connected with a load;
the other end of the secondary winding is also connected with a zero line end of the alternating current input through the tap gating circuit;
the tap gating circuit comprises a plurality of controllable switch branches connected in parallel, the number of the controllable switch branches is consistent with that of taps of the primary winding, each controllable switch branch comprises two controllable switches connected in series, and each tap of the primary winding is correspondingly connected between the two controllable switches of one controllable switch branch;
when the tap gating circuit works, the actual working turns of the primary winding are adjusted by controlling the switching state of each controllable switch in the tap gating circuit, so that the secondary winding provides corresponding specified compensation voltage.
2. The ac voltage regulator according to claim 1, wherein the step of adjusting the actual number of turns of the primary winding by controlling the switching state of each controllable switch in the tap gating circuit comprises, with the controllable switch in each controllable switch branch connected to the neutral terminal being the second controllable switch and the other controllable switch being the first controllable switch:
and controlling a first controllable switch in each controllable switch branch to be conducted, and controlling a second controllable switch in each controllable switch branch to be conducted, wherein the conducted first controllable switch and the conducted second controllable switch do not belong to the same controllable switch branch, and the number of turns between a tap connected with the conducted first controllable switch and a tap connected with the conducted second controllable switch is the actual working number of turns.
3. The ac voltage regulator of claim 2, wherein a specified voltage is applied between a tap connected to said first controllable switch and a tap connected to said second controllable switch, said specified voltage inducing said specified compensation voltage in said secondary winding, said specified compensation voltage being equal to a quotient of said specified voltage and an actual transformation ratio of said multi-tap mutual inductance transformer, said actual transformation ratio of said multi-tap mutual inductance transformer being a ratio of said actual number of turns in said secondary winding to said actual number of turns in said operating winding.
4. The ac voltage regulator of claim 1, wherein an overcurrent protection module is further connected between the other end of the secondary winding and the tap gating circuit.
5. The AC voltage regulator according to any one of claims 1 to 4, wherein the tap gating circuit comprises 6 controllable switching branches connected in parallel, and the primary winding of the multi-tap mutual inductance transformer comprises 6 taps.
6. The ac voltage regulator according to claim 5, wherein the 6 taps are a first tap, a second tap, a third tap, a fourth tap, a fifth tap, and a sixth tap in this order;
when the number of turns between the first tap and the sixth tap is the actual number of working turns, the actual transformation ratio of the multi-tap mutual inductance transformer is 1100: 22;
when the number of turns between the first tap and the fifth tap is the actual number of working turns, the actual transformation ratio of the multi-tap mutual inductance transformer is 550: 22;
when the number of turns between the first tap and the fourth tap is the actual number of working turns, the actual transformation ratio of the multi-tap mutual inductance transformer is 336: 22;
when the number of turns between the first tap and the third tap is the actual number of working turns, the actual transformation ratio of the multi-tap mutual inductance transformer is 275: 22;
when the number of turns between the first tap and the second tap is the actual number of working turns, the actual transformation ratio of the multi-tap mutual inductance transformer is 220: 22.
7. the ac regulator of claim 5, wherein said primary winding is wound from copper wire and said secondary winding is wound from aluminum foil.
8. The AC voltage regulator of claim 5, wherein the controllable switch comprises a triac, a relay, or an insulated gate bipolar transistor.
9. An ac voltage stabilizing apparatus, characterized in that the ac voltage stabilizing apparatus comprises an isolation transformer for converting an input first ac voltage into a second ac voltage, and an ac voltage stabilizer according to any one of claims 1 to 8, the ac voltage stabilizer being connected to the isolation transformer for stabilizing the second ac voltage at a preset value and outputting it to a load.
10. The ac voltage stabilizing apparatus according to claim 9, wherein when the isolation transformer is a three-phase output, one ac voltage stabilizer according to any one of claims 1 to 8 is connected to each phase output.
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| CN202010241637.5A CN111338412A (en) | 2020-03-31 | 2020-03-31 | Alternating current voltage stabilizer and alternating current voltage stabilizing equipment |
| PCT/CN2020/128722 WO2021196629A1 (en) | 2020-03-31 | 2020-11-13 | Alternating-current voltage stabilizer and alternating-current voltage stabilizing device |
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| CN202010241637.5A CN111338412A (en) | 2020-03-31 | 2020-03-31 | Alternating current voltage stabilizer and alternating current voltage stabilizing equipment |
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| WO2021196629A1 (en) * | 2020-03-31 | 2021-10-07 | 科华恒盛股份有限公司 | Alternating-current voltage stabilizer and alternating-current voltage stabilizing device |
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| CN114050751B (en) * | 2021-11-25 | 2023-09-22 | 云南电网有限责任公司电力科学研究院 | Method for calculating closed-loop power regulation gear of phase-shifting transformer |
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Application publication date: 20200626 |