CN117792099A - Novel high-voltage-multiplying rectifying circuit suitable for high-voltage low-current output occasion - Google Patents
Novel high-voltage-multiplying rectifying circuit suitable for high-voltage low-current output occasion Download PDFInfo
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Abstract
The invention discloses a novel high-voltage-doubling rectifying circuit suitable for high-voltage low-current output occasions, and relates to the technical field of power systems. The invention comprises an inverter circuit, a transformer and a voltage doubling rectifying circuit, wherein the voltage doubling rectifying circuit consists of a diode and a secondary winding of the transformer, a basic unit rectifying circuit of the voltage doubling rectifying circuit consists of a secondary side of the transformer and four diodes, the basic unit rectifying circuit comprises A type and B type, the difference between the A type basic unit rectifying circuit and the B type basic unit rectifying circuit is that the directions of reference voltages of the secondary sides of the transformers are different, and the directions of the reference voltages of the secondary sides of the transformers are one above and one below, namely, the directions of the voltages of the two different basic unit rectifying circuits are opposite in actual working. The whole circuit of the invention finishes the conversion from direct current to alternating current to direct current, and the voltage can be amplified in multiple stages in the circuit, thereby being applicable to the design of high-voltage low-current power supply.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a novel high-voltage-doubler rectifying circuit suitable for high-voltage low-current output occasions.
Background
The high-voltage low-current output means that the internal resistance of a high-voltage power supply is very large, so that the output current is very low, when the high-voltage is used for transmission in a power transmission line, the current is correspondingly reduced, and the power is unchanged, because the higher the voltage is, the smaller the current is, the current loss is caused by the resistor in the transmission line according to ohm law p=vi, and the high-voltage transmission can reduce the resistance loss, improve the energy transmission efficiency and reduce the loss and the cost of the power transmission line;
in the design of a high-voltage power supply, in order to obtain higher voltage, a method of directly obtaining high-voltage output at the secondary side of the transformer by increasing the transformation ratio of the transformer is generally adopted, and is feasible under the condition that the required power output voltage is not too high, but when the required power output voltage is higher, if the required power output voltage is directly obtained at the secondary side of the transformer, the number of turns of a secondary winding of the transformer is inevitably excessive, large charge-discharge current and noise can be generated in actual engineering, so that a primary switch of the transformer generates large loss and even cannot work normally, insulation of the transformer with excessive turns is difficult to be performed, and the withstand voltage value is difficult to reach engineering requirements;
therefore, a novel high-voltage-multiplying rectifying circuit suitable for high-voltage low-current output occasions is provided.
Disclosure of Invention
The invention aims to provide a novel high-voltage-multiplying rectifying circuit suitable for high-voltage low-current output occasions so as to solve the problems in the technical background.
The invention is realized by the following technical scheme:
the invention relates to a novel high-voltage-doubling rectifying circuit suitable for high-voltage low-current output occasions, which comprises an inverter circuit, a transformer and a voltage-doubling rectifying circuit, wherein the voltage-doubling rectifying circuit consists of a diode and a transformer secondary winding, a basic unit rectifying circuit of the voltage-doubling rectifying circuit consists of a transformer secondary and four diodes, the basic unit rectifying circuit comprises an A-type basic unit rectifying circuit and a B-type basic unit rectifying circuit, the A-type basic unit rectifying circuit and the B-type basic unit rectifying circuit are different in the direction of the transformer secondary reference voltage, and the directions of the transformer secondary reference voltages are one above and one below, namely the voltage directions of the two different basic unit rectifying circuits are opposite in actual operation;
the voltage doubling rectifying circuit is formed by overlapping basic unit rectifying circuits, the basic unit rectifying circuits formed by overlapping enable output voltage to be amplified in a multiplied mode, A-type basic unit rectifying circuits and B-type basic unit rectifying circuits are alternately overlapped when the basic unit rectifying circuits are overlapped, a group of diodes are arranged between every two basic unit rectifying circuits after overlapping, at the moment, repeated diodes are omitted, and namely the basic unit rectifying circuits share one group of diodes when overlapping every two basic unit rectifying circuits.
Preferably, when TH1 is turned on and TH2 is turned off, the dc voltage provided by Ein is divided into two sections up and down A, B by passing through the inductor Lo and going to the midpoint of the transformer, the current flows into the section a of the transformer from the midpoint, the positive and negative directions of the section a of the transformer are positive and negative directions, the capacitor C is a relatively large capacitor, the capacitor is charged by the circuit firstly, the capacitor is charged by the capacitor when the current at the upper end of the section a of the transformer comes out to the node at the left side of the capacitor, in the charging process, the voltage direction of the section B is positive and negative from the upper part supplied by the power supply, so that the voltage of the section B is positive and negative from the lower part, so that the positive and negative relations of the whole transformer are consistent, the current finally returns to the negative end of the power supply through TH1 again after passing through the section a of the transformer, the section a has a stable voltage value of the power supply voltage, and the section B has a small jitter due to the working characteristic of the capacitor;
after a very short moment when both TH1 and TH2 are turned off, the capacitor discharges at the moment, and the capacitor has a freewheel effect;
when TH1 is closed and TH2 is opened, the situation is opposite, the section B of the transformer always has a relatively stable voltage, the positive and negative of the section B are positive and negative, then the capacitor C1 is charged, the voltage of the final C approaches to the double power supply voltage along with the progress of the charging process, the voltage of the A, B section transformer is stabilized to the voltage value of the power supply voltage, and the positive and negative directions are both positive and negative.
The voltage can be increased once through the transformer, then the number of windings can be increased, the multi-stage amplification of the voltage is completed through repeatedly using the basic unit rectifying circuit, so that the voltage of the voltage increased by the transformer can be relieved when the required voltage is particularly high, finally the whole circuit is used for completing the conversion from direct current to alternating current to direct current, and the voltage can be amplified in multiple stages in the circuit, and the transformer is suitable for the design of a high-voltage low-current power supply.
The invention has the following beneficial effects:
the invention is suitable for the novel high-voltage-doubling rectifying circuit in the high-voltage low-current output occasion, not only completes rectification in the rectifying part of the circuit, but also amplifies voltage in multiple, and the formed high-voltage low-current has the advantages of small wire loss, and can greatly reduce the line loss compared with low-voltage high-current when the power is fixed.
The invention is suitable for the novel high-voltage-doubling rectifying circuit in the high-voltage low-current output occasion, the transformer comprises a plurality of windings, the voltages of the windings are overlapped in the back-end rectifying circuit, the boosting pressure can be relieved, the charge-discharge current and noise can be reduced, the primary switching loss of the transformer can be reduced, and in addition, the insulation property and the voltage-withstanding value of the transformer can be kept.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments 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 that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the operation of the voltage doubler rectifier circuit of the present invention;
FIG. 2 is a schematic diagram of the basic unit rectifying circuit operation of the voltage doubling rectifying circuit of the present invention;
FIG. 3 is a schematic diagram of a basic unit rectification circuit after superposition according to the present invention;
FIG. 4 is a schematic diagram of a thyristor switch in a voltage doubler rectifier circuit according to the present invention;
fig. 5 is a second schematic circuit diagram of the thyristor switch in the voltage doubler rectifier circuit of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the present invention is a novel high voltage doubler rectifier circuit suitable for high voltage and low current output occasions, and is a doubler rectifier circuit composed of diodes D1 to D10 and secondary windings L1 to L4 of a transformer, and its working principle is as follows:
the basic unit rectifying circuit consists of a transformer secondary side and four diodes, and is similar to the basic bridge rectifying circuit, as shown in fig. 2, the basic unit rectifying circuit is divided into an A type and a B type, the difference between the A type and the B type is that the reference voltage direction of the transformer secondary side is different, one is at the lower part, that is, the voltage directions of the two different basic unit rectifying circuits are opposite in actual operation, the whole voltage doubling rectifying circuit is formed by overlapping the basic unit rectifying circuits, the output voltage is amplified in a doubling way, the A type basic unit rectifying circuit and the B type basic unit rectifying circuit are alternately overlapped when the basic unit rectifying circuits are overlapped, as shown in fig. 3, a group of diodes are repeated between every two basic unit rectifying circuits after the overlapping (white diodes in fig. 3), the group of diodes can be omitted, that is, the basic unit rectifying circuits can share a group of diodes when the basic unit rectifying circuits are overlapped in pairs, and the effect after the overlapping is as shown in the right circuit in fig. 1;
taking a circuit formed by D1 to D6 and L1 and L2 as an example, the working principle of the whole voltage doubling rectifying circuit can be explained, as shown in FIG. 1, L1 and L2 represent two sections of corresponding transformer secondary sides of a primary side A, B of a transformer, the two positive and negative directions of the transformer secondary sides are consistent, namely, when L1 is positive and negative, L2 is positive and negative from top to bottom, otherwise, when L1 is positive and negative, L2 is positive and negative from top to bottom, but when diodes are connected, the connection directions are opposite, D1 and D2 are connected with the upper end of L1, D4 and D5 are connected with the lower end of L1, D2 and D3 are connected with the lower end of L2, D5 and D6 are connected with the upper end of L2, and the positive and negative voltage conversion of L1 and L2 is realized by alternately opening and closing two thyristors of a left circuit;
when TH2 is turned on and TH1 is turned off, L1 and L2 are both positive and negative, since the connection directions of the diode sides are opposite, voltages between D1, D2, D4 and D5 are positive and negative, voltages between D2, D3, D5 and D6 are positive and negative respectively, equivalently shown in fig. 4, in this case, D4, D2 and D6 are turned on, the right end of diode D1 is at a high level, the left end is at a low level, and the effect of D1 is to prevent the current of E1 from flowing back to the negative end of E1 through the line where D1 is located, so that the current flows from E1, after passing through D2 in series with E2, through D6 to supply power to an external load, and finally passes through D4 to return to the negative end of E1, in fig. 3, the current flow direction has been marked, and the non-conductive part is a dotted line;
when TH1 is turned on and TH2 is turned off, as shown in fig. 5, the turned-on diodes are D1, D5, and D3, at this time, the right end of D4 is at high level, the left end is at low level, and D4 is used to prevent short circuit caused by the E1 current flowing out from the positive electrode through the line where D4 is located and the D1 flowing back to the E1 negative terminal, so that the E1 current is supplied to the external load through D3 after passing through D2 and E2 in series, and finally returns to the E1 negative terminal through D1.
The voltages of L1 and L2 are continuously changed due to the fact that the switch of the left-side circuit thyristor is changed, but for a load, the right-side node of the voltage is always positive, current flows out of the right-side node, the left-side node of the D4 is negative, and the current returns from the left-side node, so that direct current is received for the load, rectification is completed, the rectification circuit has the function of multiplying the voltage, the amplification factor is related to the turn ratio of an original auxiliary coil, the whole rectification circuit can be composed of a plurality of sub-circuits, and the voltage can be superimposed in series connection between the sub-circuits, so that the voltage is further amplified;
regarding the problem of voltage amplification factor, assuming that the input voltage is Ein, the turns ratio of the primary winding and the secondary winding of the transformer is n, and the output voltage is Eo, the amplification factor of voltage of a basic unit rectifying circuit is n, and assuming that m windings are arranged on the secondary winding of the transformer, the formula of the final Eo is:
Eo＝m×n×Ein。
the invention comprises three parts of technologies, namely application of a multi-winding transformer, an inverter circuit and a voltage doubling rectifying circuit;
the transformer is a static electric appliance, which converts alternating current electric energy of one voltage class into alternating current electric energy of another voltage class with the same frequency through electromagnetic induction among coils, and has the functions of transformation, conversion, exchange impedance and isolation circuit;
the inverter circuit and the rectifying circuit are in a corresponding relation, the conversion of direct current into alternating current is called voltage inversion, the conversion of alternating current into direct current is called voltage rectification, the application of the inverter circuit is very wide, in various existing power supplies, a storage battery, a dry battery, a solar battery and the like are all direct current power supplies, and when the power supplies are needed to supply power to an alternating current load, the inverter circuit is needed;
the rectification circuit is widely applied in the fields of speed regulation of a direct current motor, excitation regulation of a generator, electrolysis, electroplating and the like, the rectification circuit in the power circuit mainly comprises three types of half-wave rectification circuit, full-wave rectification circuit and bridge rectification, the voltage doubling rectification circuit is used for rectifying other alternating current signals, the output unidirectional pulsating direct current characteristics of the first three types of rectification circuits are different, the voltage output by the half-wave rectification circuit is only half-circle, the half-circle of alternating current is removed, so that the frequency of alternating current components in unidirectional pulsating direct current is not changed, the full-wave rectification circuit is the same as the bridge rectification circuit, the frequency is doubled by using the positive half-circle and the negative half-circle of the input alternating current voltage, the frequency is improved, filtering is facilitated, the voltage doubling rectification circuit is often used in places needing high voltage and small current, the voltage doubling rectification circuit can store the lower alternating voltage on respective capacitors by rectification diodes and guide functions of the diodes, and then the principle that the voltage is added according to the polarity is high by the voltage is serially connected to enable the output voltage to be higher than the input voltage.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (3)
1. The novel high-voltage doubling rectifying circuit is characterized by comprising an inverter circuit, a transformer and a voltage doubling rectifying circuit, wherein the voltage doubling rectifying circuit consists of a diode and a transformer secondary winding, a basic unit rectifying circuit of the voltage doubling rectifying circuit consists of a transformer secondary and four diodes, the basic unit rectifying circuit comprises an A-type basic unit rectifying circuit and a B-type basic unit rectifying circuit, the A-type basic unit rectifying circuit and the B-type basic unit rectifying circuit are different in the direction of a transformer secondary reference voltage, and the directions of the transformer secondary reference voltages are one above and one below, namely the voltage directions of the two different basic unit rectifying circuits are opposite in actual operation;
the voltage doubling rectifying circuit is formed by overlapping basic unit rectifying circuits, the basic unit rectifying circuits formed by overlapping enable output voltage to be amplified in a multiplied mode, A-type basic unit rectifying circuits and B-type basic unit rectifying circuits are alternately overlapped when the basic unit rectifying circuits are overlapped, a group of diodes are arranged between every two basic unit rectifying circuits after overlapping, at the moment, repeated diodes are omitted, and namely the basic unit rectifying circuits share one group of diodes when overlapping every two basic unit rectifying circuits.
2. The novel high voltage double voltage rectifying circuit suitable for high voltage and low current output occasions according to claim 1, wherein the novel high voltage double voltage rectifying circuit is used for completing conversion from direct current to alternating current and then to direct current and voltage amplification.
3. The novel high-voltage doubling rectifying circuit suitable for the high-voltage low-current output occasion according to claim 1, wherein the novel high-voltage doubling rectifying circuit comprises TH1 and TH2, the TH1 and the TH2 are two switches, the novel high-voltage doubling rectifying circuit finishes voltage inversion and provides inverted alternating current to a primary side of a transformer, and the inversion is completed through alternate on and off of two thyristors of TH1 and TH 2.
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| CN202410013770.3A CN117792099A (en) | 2024-01-04 | 2024-01-04 | Novel high-voltage-multiplying rectifying circuit suitable for high-voltage low-current output occasion |
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| CN202410013770.3A CN117792099A (en) | 2024-01-04 | 2024-01-04 | Novel high-voltage-multiplying rectifying circuit suitable for high-voltage low-current output occasion |
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