CN112953232A - DC conversion power supply - Google Patents
DC conversion power supply Download PDFInfo
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- CN112953232A CN112953232A CN202110093454.8A CN202110093454A CN112953232A CN 112953232 A CN112953232 A CN 112953232A CN 202110093454 A CN202110093454 A CN 202110093454A CN 112953232 A CN112953232 A CN 112953232A
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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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to a DC power supply technology based on DC-AC-DC conversion, in particular to a DC conversion power supply, which mainly comprises an input positive terminal S1, an input negative terminal S2, an output positive terminal S3, an output negative terminal S4, power triodes K1, K2, K3 and K4, resistors R1, R2, R3, R4, R5 and R6, capacitors C1, C2, C3, C4, C5 and C6, diodes D1, D2, D3, D4, D5 and D6, a double-winding transformer T2, a five-winding transformer and other devices; aiming at a switch type power supply with direct current input and direct current output, the invention provides a circuit topological structure design scheme without controlling a power supply and a control chip in order to simplify the structure of the power supply and improve the reliability and the practicability of the power supply operation.
Description
Technical Field
The invention relates to a DC power supply technology based on DC-AC-DC conversion, in particular to a DC conversion power supply.
Background
At present, power supplies for realizing power conversion by using power triodes are various, and in order to realize the on-off control of the power triodes, various special integrated control chips or digital circuits are adopted in the power supplies, which is the most common and widely used technical scheme at present. However, no matter the integrated control chip or the digital circuit is used, not only a separate control power supply needs to be provided, but also the technical problems of electrical isolation between weak current and strong current and the like need to be considered, and the complexity of power supply design is increased.
Disclosure of Invention
Technical problem to be solved
Aiming at a switch type power supply with direct current input and direct current output, the invention provides a circuit topological structure design scheme without controlling a power supply and a control chip in order to simplify the structure of the power supply and improve the reliability and the practicability of the power supply operation.
(II) the adopted technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a direct current conversion power supply mainly comprises an input positive electrode terminal S1, an input negative electrode terminal S2, an output positive electrode terminal S3, an output negative electrode terminal S4, power triodes K1, K2, K3 and K4, resistors R1, R2, R3, R4, R5 and R6, capacitors C1, C2, C3, C4, C5 and C6, diodes D1, D2, D3, D4, D5 and D6, a double-winding transformer T2 and a five-winding transformer.
As a further optimization of the scheme, the five-winding transformer is formed by winding a first winding T11, a second winding T12, a third winding T13, a fourth winding T14 and a fifth winding T15 on the same iron core.
As a further optimization of the scheme, the specific connection relationship of the above devices is as follows:
the input positive terminal S1 is connected to the positive electrode of the external dc power supply;
the input negative terminal S2 is connected to the negative electrode of the external dc power supply;
the collector of the power triode K1 is connected with the input positive terminal S1, the emitter of the power triode K1 is connected with the collector of the power triode K4 and the anode of the diode D1, and the base of the power triode K1 is connected with the cathode of the diode D1 and one end of the resistor R1;
the other end of the resistor R1 is connected with one end of the first winding T11;
the dotted terminal of the first winding T11 (dotted terminals among the first winding T11, the second winding T12, the third winding T13, the fourth winding T14 and the fifth winding T15, denoted by a symbol, the same below) is connected to the anode of the diode D1;
an emitter of the power triode K2 is connected with an input negative terminal S2 and an anode of the diode D2, and a base of the power triode K2 is connected with a cathode of the diode D2 and one end of the resistor R2;
the other end of the resistor R2 is connected with one end of the second winding T12;
the dotted terminal of the second winding T12 is connected to the anode of the diode D2;
the collector of the power triode K3 is connected with the input positive terminal S1, the emitter of the power triode K3 is connected with the collector of the power triode K2 and the anode of the diode D3, and the base of the power triode K3 is connected with the cathode of the diode D3 and one end of the resistor R3;
the other end of the resistor R3 is connected with the dotted end of the third winding T13;
the other end of the third winding T13 is connected with the anode of a diode D3;
an emitter of the power triode K4 is connected with an input negative terminal S2 and an anode of the diode D4, and a base of the power triode K4 is connected with a cathode of the diode D4 and one end of the resistor R4;
the other end of the resistor R4 is connected with the dotted end of the fourth winding T14;
the other end of the fourth winding T14 is connected with one end of a capacitor C2;
the other end of the capacitor C2 is connected with the anode of a diode D4;
the resistor R5 and the capacitor C1 are connected between the collector and the emitter of the power transistor K1 in parallel;
one end of the resistor R6 is connected with the anode of the diode D1, and the other end is connected with the cathode of the diode D4;
the dotted terminal of the fifth winding T15 is connected with the capacitor C3, and the other terminal of the fifth winding T15 is connected with the emitter of the power triode K1;
the other end of the capacitor C3 is connected with one end of a primary winding of a double-winding transformer T2;
the other end of the primary winding of the double-winding transformer T2 is connected with the collector of a power triode K2;
one end of a secondary winding of the double-winding transformer T2 is connected with the anode of the diode D5, the other end of the secondary winding of the double-winding transformer T2 is connected with the anode of the diode D6, and a middle tap of the secondary winding of the double-winding transformer T2 is connected with an output negative terminal S4;
two ends of the capacitor C4 are respectively connected with the anode of the diode D5 and the anode of the diode D6;
the output positive terminal S3 is connected to the cathode of the diode D5 and the cathode of the diode D6, respectively;
two ends of the capacitor C5 are connected to an output positive terminal S3 and an output negative terminal S4, respectively;
the capacitor C6 is connected in parallel between the collector and emitter of the power transistor K3.
(III) advantageous effects
The invention provides a direct current voltage conversion power supply which has the following beneficial effects:
(1) by adopting the full-bridge inverter circuit structure, the power grade of the circuit is improved while the electrical isolation of the input side and the output side is realized.
(2) The driving control of the full-bridge inverter circuit is realized by adopting discrete devices, a special driving chip and a digital circuit are not needed, the structure of a power supply is simplified, and the reliability of the power supply operation is improved.
(3) A structure of two-stage capacitance filtering is adopted in the full-wave rectifying circuit, so that the quality of output direct-current voltage is improved.
Drawings
The invention is further illustrated below with reference to the accompanying drawings:
fig. 1 is a schematic diagram of a dc conversion power circuit according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
(1) The input positive terminal S1, the input negative terminal S2, the output positive terminal S3, and the output negative terminal S4 may be implemented by using various conventional terminals or electrical connectors.
(2) The power triodes K1, K2, K3 and K4 can select various existing power triodes according to the requirements of voltage and current, and are provided with necessary absorption and buffer circuits.
(3) The resistors R1, R2, R3, R4, R5 and R6 are used for carrying out resistance value calculation according to the driving requirements of the power triodes K1, K2, K3 and K4, and are selected according to the related technical requirements.
(4) And the capacitors C1 and C6 calculate parameters such as capacitance values, withstand voltage values and the like according to voltage spike data generated in the switching process of the power triodes K1 and K3, and select specific models.
(5) The capacitor C2 calculates parameters such as capacitance value and withstand voltage value according to the driving requirements of the power triode K4, and selects a specific model.
(6) The capacitance value, the withstand voltage value and other parameters of the capacitor C3 need to be calculated and selected according to the LC series resonance principle according to the inductance value of the double-winding transformer T2, the power of the power supply and other parameters.
(7) The capacitors C4 and C5 calculate and select parameters according to the filtering requirements and the like according to data such as switching frequency and the like.
(8) The diodes D1, D2, D3 and D4 are used for carrying out parameter calculation and selection according to the protection requirements of the power triodes K1, K2, K3 and K4.
(9) The diodes D5 and D6 were subjected to parameter calculation and model selection with reference to the full-wave rectifier circuit design method.
(10) Five windings of the five-winding transformer are wound on the same iron core and are tightly coupled with each other, and parameter calculation and design are performed according to the driving requirements of the power triodes K1, K2, K3 and K4.
(11) The double-winding transformer T2 refers to the design method of a full-bridge inverter circuit and a full-wave rectifier circuit for parameter calculation and design.
Example 2
(1) By removing the capacitor C5, the output voltage ripple increases, but the power demand of the load such as the motor can be satisfied.
The other contents are the same as those of embodiment 1.
Principle of operation
The working principle of the direct current conversion power supply provided by the invention is as follows:
the input positive terminal S1 and the input negative terminal S2 are respectively connected to the positive and negative poles of an external dc power supply; an external direct current power supply charges a capacitor C2 through resistors R5, R6, R4 and a fourth winding T14; when the voltage of the capacitor C2 is high enough, the power transistor K4 is turned on; since the third winding T13 is tightly coupled to the fourth winding T14 and the terminals of the third winding are in accordance with the same name, the power transistor K3 is turned on by the induced electromotive force generated by the third winding T13 during the turn-on of the power transistor K4.
After the power triode K3 and the power triode K4 are conducted, under the action of an external power supply, current sequentially passes through an input positive terminal S1, the power triode K3, a primary winding of a double-winding transformer T2, a capacitor C3, a fifth winding T15, the power triode K4 and an input negative terminal S2 to form a closed loop; in the process that the current flowing through the collectors of the power transistor K3 and the power transistor K4 increases from zero, induced electromotive force is generated in the first winding T11, the second winding T12, the third winding T13, the fourth winding T14 and the fifth winding T15, the polarities of the induced electromotive force are positive, so that the base potentials of the power transistor K3 and the power transistor K4 increase, and the collector current of the induced electromotive force further increases until the power transistor K3 and the power transistor K4 enter a saturated conduction state; as the current flowing through the fifth winding T15 becomes larger, the magnetic circuit of the five-winding transformer is saturated, the induced electromotive force in the five windings thereof drops sharply, the base potentials of the power triode K3 and the power triode K4 drop, the collector current decreases, the induced electromotive force generated by the fifth winding T15 tries to prevent the reduction of the current, the polarity of the induced electromotive force is negative with the same name, so that the base potentials of the power triode K3 and the power triode K4 drop rapidly, and the base potentials of the power triode K1 and the power triode K2 rise rapidly; this interlocked positive feedback quickly turns off power transistor K3 and power transistor K4, and turns on power transistor K1 and power transistor K2.
After the power triode K1 and the power triode K2 are conducted, current sequentially passes through an input positive terminal S1, a power triode K1, a fifth winding T15, a capacitor C3, a primary winding of a double-winding transformer T2, a power triode K2 and an input negative terminal S2 to form a closed loop; along with the current flowing through the power triode K1 and the collector electrode of the power triode K2 becoming larger from zero, the induced electromotive force generated in the first winding T11 and the second winding T12 gradually increases until the power triode K1 and the power triode K2 are in saturated conduction, and then the magnetic circuit of the five-winding transformer is saturated; the current flowing through the fifth winding T15 begins to decrease; the base potentials of the power transistor K1 and the power transistor K2 are rapidly reduced under the action of induced electromotive force, the base potentials of the power transistor K3 and the power transistor K4 are rapidly increased, the interlocked positive feedback rapidly cuts off the power transistor K1 and the power transistor K2, and the power transistor K3 and the power transistor K4 are switched on.
In this way, the power triode K1 and the power triode K2 form one group, the power triode K3 and the power triode K4 form another group, the two groups of power triodes are conducted in turn, and pulse voltage similar to square waves can be obtained at two ends of a primary winding of the double-winding transformer T2; the secondary winding of the double-winding transformer T2, the diode D5 and the diode D6 form a full-wave rectification circuit, alternating pulse voltage input by the primary winding of the double-winding transformer T2 is rectified into direct current voltage, and the direct current voltage passes through the output positive terminal S3 and the output negative terminal S4 to be supplied to an external load.
In the operation process of the direct current conversion power supply, the capacitor C1 and the capacitor C6 can respectively filter out voltage spikes at two ends of the power triode K1 and the power triode K3, so that a protection effect is achieved; the capacitor C3 is a resonance capacitor, and the size of the capacitance value of the capacitor C3 can be adjusted to change the size of the power output power within a certain range; the capacitor C4 can filter out high-frequency components in the secondary winding output voltage of the double-winding transformer T2; the capacitor C5 can filter ripples in the output direct-current voltage of the full-wave rectifying circuit; the resistors R1, R2, R3 and R4 are current-limiting resistors; the diodes D1, D2, D3 and D4 are respectively used for protecting the power triodes K1, K2, K3 and K4 and preventing the reverse voltage between the base electrode and the emitter electrode from being too high.
While the basic teachings of the present invention have been described, numerous extensions and variations will be apparent to those of ordinary skill in the art. As the present invention disclosed in the specification may be embodied in other specific forms without departing from the spirit or general characteristics thereof, and it is noted that some of these specific forms have been set forth, the embodiments disclosed in the specification should be considered as illustrative and not restrictive. The scope of the invention is indicated by the appended claims, rather than the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are intended to be embraced therein.
Claims (3)
1. The direct current conversion power supply is characterized by mainly comprising an input positive terminal S1, an input negative terminal S2, an output positive terminal S3, an output negative terminal S4, power triodes K1, K2, K3 and K4, resistors R1, R2, R3, R4, R5 and R6, capacitors C1, C2, C3, C4, C5 and C6, diodes D1, D2, D3, D4, D5 and D6, a double-winding transformer T2 and a five-winding transformer.
2. The DC conversion power supply according to claim 1, wherein the five-winding transformer is formed by winding a first winding T11, a second winding T12, a third winding T13, a fourth winding T14 and a fifth winding T15 on the same iron core.
3. The dc conversion power supply according to claim 2, wherein the specific connection relationship of the devices is:
the input positive terminal S1 is connected to the positive electrode of the external dc power supply;
the input negative terminal S2 is connected to the negative electrode of the external dc power supply;
the collector of the power triode K1 is connected with the input positive terminal S1, the emitter of the power triode K1 is connected with the collector of the power triode K4 and the anode of the diode D1, and the base of the power triode K1 is connected with the cathode of the diode D1 and one end of the resistor R1;
the other end of the resistor R1 is connected with one end of the first winding T11;
the dotted terminal of the first winding T11 (dotted terminals among the first winding T11, the second winding T12, the third winding T13, the fourth winding T14 and the fifth winding T15, denoted by a symbol, the same below) is connected to the anode of the diode D1;
an emitter of the power triode K2 is connected with an input negative terminal S2 and an anode of the diode D2, and a base of the power triode K2 is connected with a cathode of the diode D2 and one end of the resistor R2;
the other end of the resistor R2 is connected with one end of the second winding T12;
the dotted terminal of the second winding T12 is connected to the anode of the diode D2;
the collector of the power triode K3 is connected with the input positive terminal S1, the emitter of the power triode K3 is connected with the collector of the power triode K2 and the anode of the diode D3, and the base of the power triode K3 is connected with the cathode of the diode D3 and one end of the resistor R3;
the other end of the resistor R3 is connected with the dotted end of the third winding T13;
the other end of the third winding T13 is connected with the anode of a diode D3;
an emitter of the power triode K4 is connected with an input negative terminal S2 and an anode of the diode D4, and a base of the power triode K4 is connected with a cathode of the diode D4 and one end of the resistor R4;
the other end of the resistor R4 is connected with the dotted end of the fourth winding T14;
the other end of the fourth winding T14 is connected with one end of a capacitor C2;
the other end of the capacitor C2 is connected with the anode of a diode D4;
the resistor R5 and the capacitor C1 are connected between the collector and the emitter of the power transistor K1 in parallel;
one end of the resistor R6 is connected with the anode of the diode D1, and the other end is connected with the cathode of the diode D4;
the dotted terminal of the fifth winding T15 is connected with the capacitor C3, and the other terminal of the fifth winding T15 is connected with the emitter of the power triode K1;
the other end of the capacitor C3 is connected with one end of a primary winding of a double-winding transformer T2;
the other end of the primary winding of the double-winding transformer T2 is connected with the collector of a power triode K2;
one end of a secondary winding of the double-winding transformer T2 is connected with the anode of the diode D5, the other end of the secondary winding of the double-winding transformer T2 is connected with the anode of the diode D6, and a middle tap of the secondary winding of the double-winding transformer T2 is connected with an output negative terminal S4;
two ends of the capacitor C4 are respectively connected with the anode of the diode D5 and the anode of the diode D6;
the output positive terminal S3 is connected to the cathode of the diode D5 and the cathode of the diode D6, respectively;
two ends of the capacitor C5 are connected to an output positive terminal S3 and an output negative terminal S4, respectively;
the capacitor C6 is connected in parallel between the collector and emitter of the power transistor K3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110093454.8A CN112953232A (en) | 2021-01-22 | 2021-01-22 | DC conversion power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110093454.8A CN112953232A (en) | 2021-01-22 | 2021-01-22 | DC conversion power supply |
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| CN112953232A true CN112953232A (en) | 2021-06-11 |
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| CN202110093454.8A Pending CN112953232A (en) | 2021-01-22 | 2021-01-22 | DC conversion power supply |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102111009A (en) * | 2011-01-27 | 2011-06-29 | 卫斌鹏 | Battery charger circuit |
| CN107395022A (en) * | 2017-07-25 | 2017-11-24 | 杭州士兰微电子股份有限公司 | Mode of resonance switch converters and its control method |
-
2021
- 2021-01-22 CN CN202110093454.8A patent/CN112953232A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102111009A (en) * | 2011-01-27 | 2011-06-29 | 卫斌鹏 | Battery charger circuit |
| CN107395022A (en) * | 2017-07-25 | 2017-11-24 | 杭州士兰微电子股份有限公司 | Mode of resonance switch converters and its control method |
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Application publication date: 20210611 |
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