CN111739719A - Voltage-regulating power supply circuit - Google Patents

Voltage-regulating power supply circuit Download PDF

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Publication number
CN111739719A
CN111739719A CN202010710144.1A CN202010710144A CN111739719A CN 111739719 A CN111739719 A CN 111739719A CN 202010710144 A CN202010710144 A CN 202010710144A CN 111739719 A CN111739719 A CN 111739719A
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China
Prior art keywords
voltage
coil
power supply
regulating
supply circuit
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CN202010710144.1A
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Chinese (zh)
Inventor
楼康民
刘健龙
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Wenzhou Hehua Electric Power Technology Co ltd
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Wenzhou Hehua Electric Power Technology Co ltd
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Priority to CN202010710144.1A priority Critical patent/CN111739719A/en
Publication of CN111739719A publication Critical patent/CN111739719A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H01F29/025—Constructional details of transformers or reactors with tapping on coil or windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H01F29/04—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings having provision for tap-changing without interrupting the load current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/04—Fixed transformers not covered by group H01F19/00 having two or more secondary windings, each supplying a separate load, e.g. for radio set power supplies

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)

Abstract

The invention provides a voltage-regulating power supply circuit, wherein the input end of the voltage-regulating power supply circuit is connected with a power supply, and the output end of the voltage-regulating power supply circuit is connected with a load; the power supply comprises a phase line and a neutral line, and comprises a transformer and a voltage regulator, wherein the voltage regulator comprises a voltage regulating coil; the transformer includes primary coil and at least two sets of secondary coil, every group the input and the output of secondary coil are connected to the voltage regulator coil respectively. The transformer structure is changed by arranging the plurality of groups of secondary coils, the input and output ends of the plurality of groups of secondary coils are respectively connected with the voltage regulating coils, the current flowing on each group of electric brushes is reduced, and the heat generation is reduced, so that the current-carrying capacity of the coils is greatly improved on the premise of the same coil size, the cost is effectively reduced, and social resources are saved.

Description

Voltage-regulating power supply circuit
Technical Field
The invention relates to the field of voltage regulators, in particular to a voltage regulating power supply circuit.
Background
The contact type voltage-regulating power supply adopts a pair of or a group of electric brushes of each phase, the purpose of regulating or stabilizing voltage is realized by the sliding of the electric brushes on the coil, and the traditional scheme can only increase the power and the number of series transformers to increase the power. However, since all brushes must be pressed on the same turn or on consecutive turns and wired in parallel, the risk of turn-to-turn short circuits increases.
Because all the electric brushes are distributed on the same turn or the connected turns of coils, and each coil is only provided with one group of electric brushes, the turns of coils bear all the current, because the electric brushes have internal resistance, all the heat generation is conducted and dissipated by the turns of coils, the heat dissipation area and the coil heat transfer limitation are limited, the heat is difficult to dissipate quickly, the temperature rise at the contact point is high, the temperature rise at other positions of the coils is low, and the temperature rise difference can reach 30K-80K. This limitation results in inefficient use of the conductive capabilities of all of the wires and can easily result in coil burnout.
On the other hand, due to the limitation of the size of the coil, more brush pieces cannot be arranged in a smaller space of the same turn or the connected turns, so that the current is limited, the current-carrying capacity cannot be improved on the premise of the same size, and the cost is very high because the current needs to be increased in a size-increasing manner.
Disclosure of Invention
The invention provides a voltage-regulating power supply circuit aiming at the defects in the prior art.
In order to solve the technical problem, the invention is solved by the following technical scheme:
a voltage-regulating power supply circuit, its input end is connected with power, its carry-out terminal is connected with load; the power supply comprises a phase line and a neutral line, and comprises a transformer and a voltage regulator, wherein the voltage regulator comprises a voltage regulating coil; the transformer includes primary coil and at least two sets of secondary coil, every group the input and the output of secondary coil are connected to the voltage regulator coil respectively.
As one embodiment, the input end of each group of secondary coils is fixed on the voltage regulating coil, the output end of each group of secondary coils is provided with a slide arm, and the output end of each group of secondary coils is connected to the voltage regulator coil through the slide arm and can move on the voltage regulator coil.
As one embodiment, the input end of each group of secondary coils is provided with a slide arm, and the slide arm is connected to a voltage regulator coil; the output end of the voltage regulating coil is provided with a slide arm which is connected to the voltage regulating coil.
In one embodiment, the slide arm is connected with a brush, and the brush is connected with the voltage regulator coil.
As an embodiment, the brushes at the input ends of each group of secondary coils are connected side by side to the transformer coil, the brushes at the output ends of each group of secondary coils are connected side by side to the transformer coil, and the distance between the brushes at the input ends of each group of secondary coils is the same as the distance between the brushes at the output ends of each group of secondary coils.
As an embodiment, the transformer and the coil of the voltage regulator are independent from each other, and each set of secondary coils of the transformer are independent from each other.
In one embodiment, adjacent brushes are insulated from each other.
As one example, the slide arm is driven by a motor.
The invention has the beneficial effects that:
1. the structure of the transformer is changed by arranging a plurality of groups of secondary coils, the input and output ends of the plurality of groups of secondary coils are respectively connected with the voltage regulating coils, and the current flowing on each group of brushes is reduced;
2. based on the structure, the technical scheme arranges N (N is more than or equal to 2) groups of electric brushes on the same coil as required, and each group of electric brushes are insulated from each other, so that turn-to-turn short circuit is avoided, more electric brushes can be arranged, current on each electric brush is reduced, heat generation is reduced, current-carrying capacity of the coil is greatly improved on the premise of the same coil size, cost is effectively reduced, and social resources are saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art 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 for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a circuit schematic of one embodiment of the present invention;
FIG. 2 is a circuit schematic of another embodiment of the present invention;
fig. 3 is a circuit diagram of a conventional compensated voltage-regulated power supply.
Detailed Description
The present invention will be described in further detail with reference to examples, which are illustrative of the present invention and are not to be construed as being limited thereto.
Example 1:
as shown in fig. 1, a voltage-regulating power supply circuit has an input terminal connected to a power supply and an output terminal connected to a load; the power supply comprises a phase line L and a neutral line N, and comprises a transformer 1 and a voltage regulator 2, wherein the voltage regulator comprises a voltage regulating coil; the transformer includes primary coil and at least two sets of secondary coil, every group the input and the output of secondary coil are connected to the voltage regulator coil respectively.
One end of the voltage regulating coil is connected with the neutral wire, and the other end of the voltage regulating coil is connected with the phase wire output end. The transformer structure comprises a primary coil N1, a secondary coil N2 and a secondary coil N3, wherein the primary coil N1 is coupled with the secondary coil N2 and the secondary coil N3; the three groups of coils N1, N2 and N3 are isolated from each other.
And the secondary coil N2 and the secondary coil N3 respectively comprise a current input end and a current output end, the input ends of the secondary coil N2 and the secondary coil N3 are connected to one end of the voltage regulating coil side by side, and the output ends of the secondary coil N2 and the secondary coil N3 are connected to the other end of the voltage regulating coil side by side.
The output ends of the secondary coil N2 and the secondary coil N3 are respectively provided with a slide arm, and the two output ends are connected to the voltage regulator coil through the slide arms and can move on the voltage regulator coil.
Specifically, the slide arm is connected with an electric brush, and the electric brush is connected to a coil of the voltage regulator. The electric brushes at the input ends of each group of secondary coils are connected to the transformer coils side by side, the electric brushes at the output ends of each group of secondary coils are connected to the transformer coils side by side, and the electric brush distance at the input ends of each group of secondary coils is the same as that at the output ends of each group of secondary coils. Wherein, the adjacent electric brushes are arranged in an insulating way; the slide arm is driven by the motor and drives the electric brushes to move, wherein the slide arm drives the two groups of electric brushes to move simultaneously.
Example 2:
as another embodiment, the difference from embodiment 1 is that a slider arm is provided at an input end of each set of secondary coils in a transformer structure of a voltage-regulating power supply circuit, and the slider arm is connected to a voltage regulator coil; the output end of the voltage regulating coil is provided with a slide arm which is connected to the voltage regulating coil.
As shown in FIG. 2, the input ends of N1 and N2 of the transformer of the voltage-regulating power supply circuit are fixed on the voltage-regulating coil, and the voltage-regulating coil is not connected with the motor and cannot move; the output ends of the N1 and the N2 are connected to the other end of the voltage regulating coil through a slide arm and an electric brush, the slide arm is driven by the motor and drives the electric brush to move, and the slide arm drives the two groups of electric brushes to move simultaneously.
Further, according to the idea of the present technical solution, a technician can set the secondary coils to be more than 2 groups on the basis that hardware conditions can be met. Again, this will not be described in detail.
The present solution is explained further below by means of the current flowing through the brushes and the heat generated.
As shown in fig. 3, the left diagram is symmetrical, and the right diagram is asymmetrical, and it can be seen from the diagram that there is only one pair of brush assemblies or one set of brush assemblies, so that all the current passes through the same set of brushes in the prior art, and under this principle, if multiple sets of brushes are used and do not press on the same turn, the brushes will be burned out due to short circuit caused by the voltage difference between turns. Where subscript (c) represents a prior art solution parameter and subscript (a) represents a present solution parameter.
For example, a 100KvA voltage-regulating power supply with a voltage-regulating range of 20%, a rated voltage of 380V and a rated current of 152A, in the prior art, the ratio N1/N2 of the primary coil and the secondary coil of the series transformer is designed to be 76V/380V-0.2, so that when the lower limit voltage (304V) or the upper limit voltage (456V) of the input voltage is input, the output voltage can be regulated to 380V according to the principle of voltage vector superposition.
According to ampere-turn law:
N1I1＝N2I
the current flowing through the brush is:
I(c)＝N1/N2*I1＝0.2*152A＝30.4A
according to current IcThe heat Q1 generated by conductor R is:
Q1＝I*2Rt
in the prior art, other brushes which are connected in parallel and contact the same turn coil or the connected turn coils are considered as the same group of brush assemblies, namely the principle is the same.
The heat Q2 in example 1 and example 2 was calculated as follows:
the heat of the technical scheme is that the ratio of N1/N2 to N1/N3 is designed to be 38V/380V-0.1, and the output voltage can be regulated to 380V according to the principle of voltage vector superposition when the lower limit voltage (304V) or the upper limit voltage (456V) of the input voltage is input. (304+2 × 38 ═ 380V or 456-2 × 38 ═ 380V).
According to ampere-turn law:
N1*I1＝N2*I(a)
the current flowing through the brush is:
I(a)＝N1/N2*I1＝0.1*152A＝15.2A＝I(c)/2
therefore, the current flowing through the brushes in the solutions of example 1 and example 2 is half of that of the prior art solutions.
According to current I(a)Formula for heat Q2 generated by conductor R:
Q2＝I(a)2Rt＝(I(c)/2)2Rt＝Q1/4。
according to the calculation, the heat generated by each group of electric brushes is 1/4 of that of one group of electric brushes when two groups of electric brushes are adopted, so that the temperature rise of the contact points of the electric brushes and the coil can be effectively reduced.
According to the conductor resistance formula:
R＝ρL/s
wherein rho is resistivity, L is conductor length, and S is conductor cross-sectional area;
then, the same thermal effect Q1 ═ Q2 is to be generated;
I(c)*2Rt＝I(a)*2R t；
I(c)*2R(c)t＝(I(c)/2)2R(a)t
I(c)*2R(c)t＝(I(c)/2)2R(a)t
R(a)＝4*R(c)…………………………(1)
then, under the condition that the prior art scheme and the technical scheme generate the same heat, the sectional area of the conductor of the technical scheme can be reduced to 1/4 of the prior art scheme, and according to a mass formula:
M＝ρ1V＝ρLs……………………………(2)
and conductor resistance formula:
R＝ρ2L/s…………………………………(3)
to make the resistances R of the two schemes equal, when the electromagnetic wire lengths L are equal, the equation (1) can be used to obtain
ρ2L(c)/s(a)＝4*ρ2L(c)/s(c)；
Due to the assumption that: l is(c)＝L(a)The following can be obtained:
s(a)＝s(c)/4；
the sectional area of the electromagnetic wire of the technical scheme can be 1/4 of that of the prior technical scheme.
From equation (2) we can obtain:
M(a)＝M(c)/4；
that is, the electromagnetic wire consumption of the technical scheme is 1/4 of that of the prior technical scheme.
Wherein: m is mass; ρ 1-resistivity; ρ 2-density; v is volume; l is length; s is the cross-sectional area; r is conductor resistance;
in the actual production process, the section of the lead is reduced, so that the coil can be wound on a smaller iron core, and the length of the electromagnetic wire of the technical scheme is shorter than that of the electromagnetic wire of the existing structure, so that more electromagnetic wires can be saved.
Because the pressure difference exists between the two groups of electric brushes, the rated voltage can not be obtained even if the electric brushes move to the extreme position, therefore, under the same voltage regulation range of 20%, the turn ratio of each group of coils of the transformer is designed to be 0.22 reasonably, although the turn ratio is increased by 0.02, under the same power, the sectional area of the electromagnetic wire can be selected to be 1/4 of the prior art, and the corresponding cost can not be increased too much.
In addition, it should be noted that the specific embodiments described in the present specification may differ in the shape of the components, the names of the components, and the like. All equivalent or simple changes of the structure, the characteristics and the principle of the invention which are described in the patent conception of the invention are included in the protection scope of the patent of the invention. Various modifications, additions and substitutions for the specific embodiments described may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims (8)

1. A voltage-regulating power supply circuit, its input end is connected with power, its carry-out terminal is connected with load; the power supply comprises a phase line and a neutral line and is characterized by comprising a transformer and a voltage regulator, wherein the voltage regulator comprises a voltage regulating coil; the transformer includes primary coil and at least two sets of secondary coil, every group the input and the output of secondary coil are connected to the voltage regulator coil respectively.
2. The voltage-regulating power supply circuit according to claim 1, wherein each of said secondary coils has an input end fixed to the voltage-regulating coil and an output end provided with a slider arm, and the output end is connected to the voltage-regulating coil through the slider arm so as to be movable in the voltage-regulating coil.
3. The voltage-regulating power supply circuit according to claim 1, wherein the input end of each group of secondary coils is provided with a slide arm, and the slide arm is connected to the voltage regulator coil; the output end of the voltage regulating coil is provided with a slide arm which is connected to the voltage regulating coil.
4. The regulated power supply circuit of claim 2 or 3, wherein said wiper is connected to a brush, said brush being connected to a regulator coil.
5. The voltage-regulating power supply circuit according to claim 4, wherein brushes at the input ends of each set of said secondary coils are connected side by side to the transformer coil, brushes at the output ends of each set of said secondary coils are connected side by side to the transformer coil, and the distance between the brushes at the input ends of each set of said secondary coils is the same as the distance between the brushes at the output ends of each set of said secondary coils.
6. The voltage regulating power supply circuit according to claim 1, wherein the transformer and the coil of the voltage regulator are independent of each other, and each set of secondary coils of the transformer are independent of each other.
7. The regulated power supply circuit of claim 1, wherein adjacent brushes are insulated from one another.
8. The regulated power supply circuit of claim 2 or 3, wherein said wiper is driven by an electric motor.
CN202010710144.1A 2020-07-22 2020-07-22 Voltage-regulating power supply circuit Pending CN111739719A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010710144.1A CN111739719A (en) 2020-07-22 2020-07-22 Voltage-regulating power supply circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010710144.1A CN111739719A (en) 2020-07-22 2020-07-22 Voltage-regulating power supply circuit

Publications (1)

Publication Number Publication Date
CN111739719A true CN111739719A (en) 2020-10-02

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ID=72657227

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010710144.1A Pending CN111739719A (en) 2020-07-22 2020-07-22 Voltage-regulating power supply circuit

Country Status (1)

Country Link
CN (1) CN111739719A (en)

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