CN106329942A - High-efficiency low-ripple high-reliability miniature high-voltage power supply - Google Patents
High-efficiency low-ripple high-reliability miniature high-voltage power supply Download PDFInfo
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- CN106329942A CN106329942A CN201610780118.XA CN201610780118A CN106329942A CN 106329942 A CN106329942 A CN 106329942A CN 201610780118 A CN201610780118 A CN 201610780118A CN 106329942 A CN106329942 A CN 106329942A
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Classifications
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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
- H02M3/338—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 in a self-oscillating arrangement
- H02M3/3382—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 in a self-oscillating arrangement in a push-pull circuit arrangement
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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
- H02M1/14—Arrangements for reducing ripples from dc input or output
- H02M1/143—Arrangements for reducing ripples from dc input or output using compensating arrangements
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
-
- 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
- H02M3/338—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 in a self-oscillating arrangement
- H02M3/3385—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 in a self-oscillating arrangement with automatic control of output voltage or current
- H02M3/3387—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 in a self-oscillating arrangement with automatic control of output voltage or current in a push-pull configuration
-
- 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
- H02M1/348—Passive dissipative snubbers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a high-efficiency low-ripple high-reliability miniature high-voltage power supply, and the power supply comprises a self-oscillation push-pull circuit. The left and right half bridge arm drive units of the self-oscillation push-pull circuit are respectively provided with a speed-up oscillation starting circuit. The left and right half bridge arms of the self-oscillation push-pull circuit are respectively provided with a triode base electrode voltage judgment circuit. A quasi-resonance inductor is connected in series between the self-oscillation push-pull circuit and a series voltage stabilizing circuit. RC buffering circuits are respectively connected in parallel between the collector and emitter electrodes of each triode of the self-oscillation push-pull circuit. The self-oscillation push-pull circuit is provided with a quasi-resonance switching circuit. The power supply greatly improves the work efficiency, greatly reduces the voltage ripples, improves the stability, and improves the reliability of a power device.
Description
Technical Field
The invention belongs to the technical field of electronic circuits, and particularly relates to a high-efficiency low-ripple high-reliability miniature high-voltage power supply.
Background
The power supply has the advantages of small volume, light weight and high reliability, is always required by people for various power supply products, and the improvement of the power supply efficiency is also beneficial to reducing the volume of the power supply, lightening the weight of the power supply and improving the reliability of the power supply products.
With the construction of the conservation-oriented society, the improvement of the utilization efficiency and the reliability of the power supply device to the power supply is more and more emphasized by people, and the requirements of higher power supply conversion efficiency and better power supply reliability index are required. Especially, high voltage power supplies are often used in special, critical and highly reliable applications, such as aerospace, automotive electronics, mobile communications, medical electronics, and other fields. Therefore, high conversion efficiency and high reliability become important technical indexes for measuring the performance of the high-voltage power supply.
A main circuit of a traditional series voltage stabilization type self-oscillation push-pull conversion circuit (Switchmodeppersupplyhandbook, New York: McGraw-Hill, Inc, 1989) is shown in FIG. 1.
In fig. 1, the first primary winding P1 and the second primary winding P2 are a pair of primary windings of a known self-oscillation push-pull transformer T1, the first feedback winding N1 and the second feedback winding N2 are a pair of feedback windings of a known self-oscillation push-pull transformer T1, and the secondary winding S1 is a secondary winding of a known self-oscillation push-pull transformer T1.
The circuit in fig. 1 has the following structural relationship: the third triode V3 is a series adjusting tube and is composed of a first triode V1, a first resistor R1, a second resistor R2, a second capacitor C2, a first diode D1, a first primary winding P1, a third resistor R3, a second triode V2, a second primary winding P2, a first feedback winding N1, a second feedback winding N2 to form a self-oscillation push-pull circuit, and a secondary winding S1, a second diode D2 and a third capacitor C3 to form a rectification filter circuit. The collector of the third triode V3 is connected with a power supply; an emitter of the third triode V3 is connected with the input end of the self-oscillation push-pull circuit; the output end of the rectification filter circuit is the output end of the main circuit. The self-oscillation push-pull circuit and the rectification filter circuit are connected in a loop chain through a transformer T1.
The first primary winding P1 and the first triode V1 are connected in series to form a left half bridge arm of the self-oscillation push-pull circuit; a left half-bridge arm driving circuit of the self-oscillation push-pull circuit is formed by a series branch consisting of the second resistor R2, the first feedback winding N1 and the first resistor R1; similarly, the second primary winding P2 and the second triode V2 are connected in series to form a right half bridge arm of the self-oscillation push-pull circuit; a series branch consisting of the second resistor R2, the second feedback winding N2 and the third resistor R3 forms a right half bridge arm driving circuit of the self-oscillation push-pull circuit.
The working principle of the self-oscillation push-pull circuit is as follows: in the on-period of the first transistor V1, the left half-bridge arm is in operation, the second transistor V2 is in an off state, and the right half-bridge arm is not in operation, or vice versa. In the conduction period of the first triode V1 or the second triode V2, the magnetic core of the main power transformer is gradually driven to a saturation state, the saturation of the magnetic core of the transformer causes the voltage on the first primary winding P1, the second primary winding P2, the first feedback winding N1 and the second feedback winding N2 to turn over, so that the first triode V1 or the second triode V2 is alternately switched on and off, and the left half bridge arm and the right half bridge arm alternately work.
The circuit shown in fig. 1 has the following disadvantages:
1. when the conduction or the turn-off time of the first triode V1 or the second triode V2 in the self-oscillation push-pull circuit is too long, the supersaturation of the magnetic core of the main power transformer is caused, extra loss is generated, and the efficiency of the whole self-oscillation push-pull circuit is reduced;
2. the first triode V1 or the second triode V2 is switched on and off under high stress, and a collector electrode of the triode when the triode is switched on generates a large current peak; when the triode is turned off, a large voltage peak is borne between the collector and the emitter, which causes great switching loss and reduces the efficiency of the whole self-oscillation push-pull circuit. The typical voltage waveform of the first transistor V1 when turned on and off is shown in fig. 2;
3. the third triode V3 uses an NPN triode, the voltage drop of the triode is too large, namely, between 6V and 7V, and the conduction loss of the adjusting tube is large.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a high efficiency, low ripple and high reliability micro high voltage power supply with high efficiency and overvoltage surge resistance, which has the advantages of small size, light weight, high working efficiency, small output voltage ripple and high reliability.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-efficiency low-ripple high-reliability miniature high-voltage power supply comprises a self-oscillation push-pull circuit, wherein an acceleration oscillation starting circuit is arranged in a left half-bridge arm driving circuit and a right half-bridge arm driving circuit of the self-oscillation push-pull circuit, triode base voltage judging circuits are arranged in the left half-bridge arm and the right half-bridge arm of the self-oscillation push-pull circuit, a quasi-resonant inductor is connected between the self-oscillation push-pull circuit and a series voltage stabilizing circuit in series, an RC buffer circuit is connected between a collector and an emitter of each triode in the self-oscillation push-pull circuit in parallel, and a quasi-resonant switch circuit is arranged in the self-.
The high-efficiency low-ripple high-reliability miniature high-voltage power supply comprises a first capacitor, a series voltage stabilizing circuit, a series resonance inductor, a left half bridge arm driving circuit, a right half bridge arm, a left half bridge arm driving circuit, an output part, a second capacitor and a first diode; wherein,
the series voltage stabilizing circuit comprises a third triode, the third triode is a PNP type triode, the input end of the series voltage stabilizing circuit is a power supply, the output end of the series voltage stabilizing circuit is connected with the input end of the series resonant inductor, and the output end of the series resonant inductor is connected with the input end of the left half bridge arm;
the left half bridge arm is composed of a series-parallel branch consisting of a first primary winding, a first triode, a fourth resistor, a sixth capacitor and a first voltage-regulator tube; the input signal of the left half bridge arm is the output signal of the series resonance inductor, one end of the first primary winding is connected with the input signal, the other end of the first primary winding is connected with the collector electrode of the first triode, the emitter electrode of the first triode is connected to the input power ground through the fourth resistor, the base electrode of the first triode is connected with the output of the left half bridge arm driving circuit, the first voltage-stabilizing tube is connected between the collector electrode of the first triode and the ground in parallel, the sixth resistor and the sixth capacitor are connected in series and then connected between the collector electrode of the first triode and the ground in parallel, and the output of the left half bridge arm is the base electrode of the first triode;
the left half-bridge arm driving circuit is composed of a series-parallel branch circuit consisting of a second resistor, a first feedback winding, a first resistor and a fourth capacitor, an input signal of the left half-bridge arm driving circuit is an output signal of a series resonance inductor, one end of the second resistor is connected with the input signal, the other end of the second resistor is connected with one end of a first feedback winding, the other end of the first feedback winding is connected with one parallel end of the first resistor and the fourth capacitor, and the other parallel end of the first resistor and the fourth capacitor is an output of the left half-bridge arm driving circuit;
the output of the left half-bridge arm is mutually connected with the output of the left half-bridge arm driving circuit;
the right half bridge arm consists of a series-parallel branch consisting of a second primary winding, a second triode, a fifth resistor, a seventh capacitor and a second voltage-regulator tube; the input signal of the right half bridge arm is the output signal of the series resonance inductor, one end of the second primary winding is connected with the input signal, the other end of the second primary winding is connected with the collector of the second triode, the emitter of the second triode is connected to the input power ground through the fifth resistor, the base of the second triode is connected with the output of the right half bridge arm driving circuit, the second voltage-stabilizing tube is connected between the collector of the second triode and the ground in parallel, the seventh resistor and the seventh capacitor are connected in series and then connected between the collector of the second triode and the ground in parallel, and the output of the right half bridge arm is the base of the second triode;
the right half bridge arm driving circuit is composed of a series-parallel branch consisting of a second resistor, a second feedback winding, a third resistor and a fifth capacitor, an input signal of the right half bridge arm driving circuit is an output signal of a series resonance inductor, one end of the second resistor is connected with the input signal, the other end of the second resistor is connected with one end of the second feedback winding, the other end of the second feedback winding is connected with one parallel end of the third resistor and the fifth capacitor, and the other parallel end of the third resistor and the fifth capacitor is the output of the right half bridge arm driving circuit;
the output of the right half bridge arm is mutually connected with the output of the right half bridge arm driving circuit;
the output part is composed of a series branch consisting of a secondary winding, a second diode and a third capacitor;
the output part and the left and right half bridge arms pass through a transformer turn-chain, and the output port of the output part is positioned between the second diode and the third capacitor.
Further, the first primary winding, the second primary winding, the first feedback winding, the second feedback winding and the secondary winding are all windings of a known self-oscillation push-pull type transformer, and all the windings are wound on the same ferrite annular magnetic core.
Further, a third triode in the series voltage stabilizing circuit is a PNP type triode.
Furthermore, the series resonance inductor is a differential mode inductor and is uniformly wound on the annular magnetic core of the iron powder core by a single-strand coil.
Further, the acceleration oscillation starting circuit connected in series in each bridge arm driving circuit: the acceleration oscillation starting circuit of the left half bridge arm is composed of a parallel branch consisting of a first resistor and a fourth capacitor, and the acceleration oscillation starting circuit of the right half bridge arm is composed of a parallel branch consisting of a third resistor and a fifth capacitor, so that the positive feedback process of the feedback circuit is accelerated, and the voltage swing du/dt of the first triode or the second triode during turn-off is improved, so that the first triode or the second triode is quickly turned off, and the quick conversion of the oscillation process is realized.
Further, the triode base voltage judging circuit is formed by respectively connecting a resistor and a resistor for detecting emitter current in series between the emitter of the first triode and the emitter of the second triode in a grounding mode, and respectively connecting a base voltage stabilizing diode and a voltage stabilizing diode in parallel between the base of the first triode and the emitter of the second triode in the grounding mode.
Further, the quasi-resonant switching circuit connected in parallel in each bridge arm: the quasi-resonance switch circuit of the left half bridge arm is formed by a series circuit of a sixth resistor and a sixth capacitor and is connected between the collector of the first triode and the ground in parallel; the quasi-resonant switching circuit of the right half bridge arm is formed by a series circuit of a seventh resistor and a seventh capacitor and is connected between the collector of the second triode and the ground in parallel.
Furthermore, the first triode and the second triode are NPN type triodes, and the third triode is a PNP type triode.
Due to the adoption of the technical scheme, the invention has the following advantages:
the high-efficiency low-ripple high-reliability miniature high-voltage power supply has the advantages that the functional circuit is added in the traditional series voltage stabilization type self-excited oscillation push-pull conversion circuit, the high-efficiency low-ripple high-reliability miniature high-voltage power supply comprises an acceleration oscillation starting circuit, a triode base voltage judgment circuit and a quasi-resonant switching circuit, and a PNP type triode is used in a series voltage stabilizing circuit, so that the switching loss of a switching transistor is reduced, the oversaturation loss of a transformer magnetic core is also reduced, meanwhile, the conduction voltage drop of a switching adjusting tube is reduced to reduce the conduction loss of the switching adjusting tube, and the current spike and oscillation of the switching transistor during the on and off are improved, so that the working efficiency of the miniature high-voltage power supply is greatly improved, the output voltage ripple is greatly reduced.
Drawings
FIG. 1 is a schematic diagram of a prior art self-oscillating push-pull circuit;
FIG. 2 is a typical voltage waveform of a collector terminal when a triode operates without adding a quasi-resonant soft switching circuit at both ends of a collector and an emitter of the triode in the existing self-oscillation push-pull circuit;
FIG. 3 is a high efficiency, low ripple, high reliability miniature high voltage power supply circuit of the present invention;
fig. 4 is a typical voltage waveform of the collector terminal when the triode works after a quasi-resonance soft switching circuit is added at the two ends of the collector and the emitter of the triode in the self-oscillation push-pull circuit.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and examples.
In fig. 3, a dotted frame a is a left half bridge arm, a dotted frame B is a left half bridge arm drive, a dotted frame C is a right half bridge arm drive, a dotted frame D is a right half bridge arm, E is an output part, F is a series voltage stabilizing circuit, and G is a series resonant inductor.
As shown in FIG. 3, the high-efficiency low-ripple high-reliability micro high-voltage power supply comprises a self-oscillation push-pull circuit, wherein a left half-bridge arm driving circuit and a right half-bridge arm driving circuit of the self-oscillation push-pull circuit are respectively provided with an acceleration oscillation circuit, a triode base voltage judging circuit is arranged in the left half-bridge arm and the right half-bridge arm of the self-oscillation push-pull circuit, a quasi-resonant inductor is connected between the self-oscillation push-pull circuit and a series voltage stabilizing circuit in series, an RC buffer circuit is connected between a collector and an emitter of each triode in the self-oscillation push-pull circuit in parallel, and a quasi-resonant switch circuit is arranged.
The micro high-voltage power supply is used for inhibiting current peak when a triode is conducted by connecting the quasi-resonant inductor in series between the self-oscillation push-pull circuit and the series voltage stabilizing circuit; an RC buffer circuit is connected in parallel between a collector and an emitter of each triode in the self-oscillation push-pull circuit and used for inhibiting voltage spikes when the triodes are turned off, and the quasi-resonance switch of the power triodes is realized.
The quasi-resonant switching circuit is added in the known self-oscillation push-pull circuit, so that the problem of overlarge switching-on and switching-off stress of the power triode is solved, the voltage stress is zero when the triode is switched off, and the current stress is zero when the triode is switched on, namely the quasi-resonant switching of the triode is realized, and the switching loss of the power triode is greatly reduced. The quasi-resonance switch circuit eliminates the voltage waveform oscillation when the power triode is switched on and off, so that the output voltage ripple of the miniature high-voltage power supply is greatly reduced.
The high-efficiency low-ripple high-reliability micro high-voltage power supply is a self-oscillation push-pull converter with an acceleration oscillation starting functional circuit and a power triode quasi-resonant circuit; the circuit comprises a first capacitor C1, a series voltage stabilizing circuit, a series resonance inductor, a left half bridge arm driving circuit, a right half bridge arm, a left half bridge arm driving circuit, an output part, a second capacitor C2 and a first diode D1; wherein,
the series voltage stabilizing circuit comprises a third triode V3, the third triode V3 is a PNP type triode, the input end of the series voltage stabilizing circuit is a power supply, the output end of the series voltage stabilizing circuit is connected with the input end of a series resonance inductor (a first inductor L1), and the output end of the series resonance inductor is connected with the input end of a left half bridge arm;
the left half bridge arm is composed of a series-parallel branch consisting of a first primary winding P1, a first triode V1, a fourth resistor R4, a sixth resistor R6, a sixth capacitor C6 and a first voltage-stabilizing tube D3; the input signal of the left half bridge arm is the output signal of the series resonance inductor, one end of a first primary winding P1 is connected with the input signal, the other end of the first primary winding is connected with the collector electrode of a first triode V1, the emitter electrode of the first triode V1 is connected to the input power ground through a fourth resistor R4, the base electrode of the first triode V1 is connected with the output of the left half bridge arm driving circuit, a first voltage-stabilizing tube D3 is connected between the collector electrode of a first triode V1 and the ground in parallel, a sixth resistor R6 and a sixth capacitor C6 are connected in series and then connected between the collector electrode of a first triode V1 and the ground in parallel, and the output of the left half bridge arm is the base electrode of the first triode V1;
the left half-bridge arm driving circuit is composed of a series-parallel branch circuit consisting of a second resistor R2, a first feedback winding N1, a first resistor R1 and a fourth capacitor C4, an input signal of the left half-bridge arm driving circuit is an output signal of a series resonance inductor, one end of the second resistor R2 is connected with the input signal, the other end of the second resistor R2 is connected with one end of a first feedback winding N1, the other end of the first feedback winding N1 is connected with one parallel end of the first resistor R1 and the fourth capacitor C4, and the other parallel end of the first resistor R1 and the fourth capacitor C4 is output of the left half-bridge arm driving circuit;
the output of the left half-bridge arm is mutually connected with the output of the left half-bridge arm driving circuit;
the right half bridge arm is composed of a series-parallel branch consisting of a second primary winding P2, a second triode V2, a fifth resistor R5, a seventh resistor R7, a seventh capacitor C7 and a second voltage-stabilizing tube D4; the input signal of the right half bridge arm is the output signal of the series resonance inductor, one end of the second primary winding P2 is connected with the input signal, the other end is connected with the collector electrode of the second triode V2, the emitter electrode of the second triode V2 is connected to the input power ground through the fifth resistor R5, the base electrode of the second triode V2 is connected with the output of the right half bridge arm driving circuit, the second voltage-regulator tube D4 is connected between the collector electrode of the second triode V2 and the ground in parallel, the seventh resistor R7 and the seventh capacitor C7 are connected in series and then connected between the collector electrode of the second triode V2 and the ground in parallel, and the output of the right half bridge arm is the base electrode of the second triode V2;
the right half bridge arm driving circuit is composed of a series-parallel branch consisting of a second resistor R2, a second feedback winding N2, a third resistor R3 and a fifth capacitor C5, an input signal of the right half bridge arm driving circuit is an output signal of a series resonance inductor, one end of the second resistor R2 is connected with the input signal, the other end of the second resistor R2 is connected with one end of a second feedback winding N2, the other end of the second feedback winding N2 is connected with one parallel end of the third resistor R3 and the fifth capacitor C5, and the other parallel end of the third resistor R3 and the fifth capacitor C5 is output of the right half bridge arm driving circuit;
the output of the right half bridge arm is mutually connected with the output of the right half bridge arm driving circuit;
the output part is composed of a series branch consisting of a secondary winding S1, a second diode D2 and a third capacitor C3;
the output part and the left and right half bridge arms pass through a transformer turn-chain, and the output port of the output part is positioned between the second diode D2 and the third capacitor C3.
The first primary winding P1, the second primary winding P2, the first feedback winding N1, the second feedback winding N2 and the secondary winding S1 are all windings of a known self-oscillation push-pull transformer T1, and all the windings are wound on the same ferrite annular core.
And a third triode V3 in the series voltage stabilizing circuit is a PNP type triode.
The series resonance inductor is a differential mode inductor and is uniformly wound on the annular magnetic core with the iron powder core by a single-stranded coil, and the inductance is 10 mu H.
The first triode V1 and the second triode V2 are NPN type triodes, and the third triode V3 is a PNP type triode.
The operation of the high efficiency, low ripple, and high reliability micro high voltage power supply of the present invention is described below.
The acceleration oscillation starting circuit is connected in each bridge arm driving circuit in series: the acceleration oscillation starting circuit of the left half bridge arm is composed of a parallel branch consisting of a first resistor R1 and a fourth capacitor C4, the acceleration oscillation starting circuit of the right half bridge arm is composed of a parallel branch consisting of a third resistor R3 and a fifth capacitor C5, and the acceleration oscillation starting circuit is used for accelerating the positive feedback process of the feedback circuit and improving the voltage swing du/dt when the first triode V1 or the second triode V2 is turned off, so that the first triode V1 or the second triode V2 is turned off quickly, and the quick conversion of the oscillation process is realized.
The triode base voltage judging circuit is characterized in that a resistor R4 and a resistor R5 for detecting emitter current are respectively connected in series between the emitter of the first triode V1 and the emitter of the second triode V2, and a base voltage stabilizing diode D3 and a stabilizing diode D4 are respectively connected in parallel between the base and the ground. When the current of the first primary winding P1 or the second primary winding P2 rises, the voltage drop of the emitter current detection resistor R4 or the resistor R5 of the first triode V1 or the second triode V2 also rises, the base voltage of the triode V1 or the second triode V2 tracks the voltage, when the base voltage rises to the clamping value of 2.7V of the voltage stabilizing diode D3 or the voltage stabilizing diode D4, the voltage stabilizing tube is conducted, the base current of the triode is bypassed, the triode is turned off, and the other triode starts to be conducted. By selecting proper parameters of the resistor R4, the zener diode D3, the resistor R5 and the zener diode D4, the collector current of the first triode V1 or the collector current of the second triode V2 can be well limited, so that the collector current of the first triode V1 or the collector current of the second triode V2 is cut off at a very small collector current instead of the direct current gain HFE, and the occurrence of an overlarge collector current is avoided.
The quasi-resonant switching circuit connected in parallel in each bridge arm: the quasi-resonant switching circuit of the left half bridge arm is formed by a series circuit of a sixth resistor R6 and a sixth capacitor C6 and is connected between the collector of the first triode V1 and the ground in parallel; the quasi-resonant switching circuit of the right half bridge arm is formed by a series circuit of a seventh resistor R7 and a seventh capacitor C7, and is connected between the collector of the second triode V2 and the ground in parallel.
The series resonance inductor, a sixth resistor R6, a sixth capacitor C6, a seventh resistor R7 and a seventh capacitor C7 jointly form a quasi-resonance soft switching circuit, and the series resonance inductor L1 can reduce the current change rate of the first triode V1 and the second triode V2 when the first triode V1 and the second triode V2 are conducted; the buffer circuit reduces the peak voltage and the peak power loss when the first triode V1 and the second triode V2 are turned off; meanwhile, the resonance frequency determined by the series resonance inductor L1, the leakage inductor of the transformer T1, the distributed capacitor of the transformer T1, the output capacitor of the triode, the capacitor C6 of the buffer circuit and the capacitor C7 can reduce ringing when the first triode V1 and the second triode V2 are turned off, and current spike and oscillation when the switching transistor is turned on and turned off are improved.
The parameter values of the respective components used in the present invention are determined according to the specific application, and here, a set of parameter values of the components used for a specific application is exemplified: the capacitance value of the first capacitor is 10 muF, the capacitance value of the second capacitor is 0.33 muF, the capacitance value of the third capacitor is 0.0047 muF, the capacitance value of the fourth capacitor is 0.1 muF, the capacitance value of the fifth capacitor is 0.1 muF, the capacitance value of the sixth capacitor and the seventh capacitor is 0.0047 muF, the first triode and the second triode are NPN type triodes, the third triode is a PNP type triode, the resistance value of the first resistor is 100 omega, the resistance value of the second resistor is 2000 omega, the resistance value of the third resistor is 100 omega, the resistance values of the fourth resistor and the fifth resistor are 10 omega, the resistance values of the sixth resistor and the seventh resistor are 27 omega, the number of turns of the primary winding of the step-up transformer T1 is 10 turns, the number of turns of the feedback winding is 4 turns, the number of turns of the secondary winding is 1000 turns, the voltage stabilizing values of the first voltage regulator tube and the second voltage regulator tube are both 2.7V, and the inductance value of the first inductor is 10 muH.
The input end inputs a direct current voltage signal of 10V-20V, the output end outputs a direct current high voltage signal of 8500V, 1mA which is processed by voltage stabilization, the voltage ripple is only 500mV, and is less than one ten thousandth of the output voltage. The high voltage power supply had a volume of only 61mm x 57mm x 13.5mm and a weight of only 65 g.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, and all equivalent changes and modifications made within the scope of the claims of the present invention should fall within the protection scope of the present invention.
Claims (9)
1. The utility model provides a miniature high voltage power supply of high efficiency low ripple high reliability which characterized by: the circuit comprises a self-oscillation push-pull circuit, wherein accelerated oscillation starting circuits are arranged in a left half-bridge arm driving circuit and a right half-bridge arm driving circuit of the self-oscillation push-pull circuit, triode base voltage judging circuits are arranged in the left half-bridge arm and the right half-bridge arm of the self-oscillation push-pull circuit, a quasi-resonant inductor is connected between the self-oscillation push-pull circuit and a series voltage stabilizing circuit in series, an RC buffer circuit is connected between a collector and an emitter of each triode in the self-oscillation push-pull circuit in parallel, and a quasi-resonant switching circuit is arranged in the self-oscillation push-.
2. The high efficiency, low ripple, high reliability micro high voltage power supply of claim 1, further comprising: the circuit comprises a first capacitor, a series voltage stabilizing circuit, a series resonance inductor, a left half bridge arm driving circuit, a right half bridge arm, a left half bridge arm driving circuit, an output part, a second capacitor and a first diode; wherein,
the series voltage stabilizing circuit comprises a third triode, the third triode is a PNP type triode, the input end of the series voltage stabilizing circuit is a power supply, the output end of the series voltage stabilizing circuit is connected with the input end of the series resonant inductor, and the output end of the series resonant inductor is connected with the input end of the left half bridge arm;
the left half bridge arm is composed of a series-parallel branch consisting of a first primary winding, a first triode, a fourth resistor, a sixth capacitor and a first voltage-regulator tube; the input signal of the left half bridge arm is the output signal of the series resonance inductor, one end of the first primary winding is connected with the input signal, the other end of the first primary winding is connected with the collector electrode of the first triode, the emitter electrode of the first triode is connected to the input power ground through the fourth resistor, the base electrode of the first triode is connected with the output of the left half bridge arm driving circuit, the first voltage-stabilizing tube is connected between the collector electrode of the first triode and the ground in parallel, the sixth resistor and the sixth capacitor are connected in series and then connected between the collector electrode of the first triode and the ground in parallel, and the output of the left half bridge arm is the base electrode of the first triode;
the left half-bridge arm driving circuit is composed of a series-parallel branch circuit consisting of a second resistor, a first feedback winding, a first resistor and a fourth capacitor, an input signal of the left half-bridge arm driving circuit is an output signal of a series resonance inductor, one end of the second resistor is connected with the input signal, the other end of the second resistor is connected with one end of a first feedback winding, the other end of the first feedback winding is connected with one parallel end of the first resistor and the fourth capacitor, and the other parallel end of the first resistor and the fourth capacitor is an output of the left half-bridge arm driving circuit;
the output of the left half-bridge arm is mutually connected with the output of the left half-bridge arm driving circuit;
the right half bridge arm consists of a series-parallel branch consisting of a second primary winding, a second triode, a fifth resistor, a seventh capacitor and a second voltage-regulator tube; the input signal of the right half bridge arm is the output signal of the series resonance inductor, one end of the second primary winding is connected with the input signal, the other end of the second primary winding is connected with the collector of the second triode, the emitter of the second triode is connected to the input power ground through the fifth resistor, the base of the second triode is connected with the output of the right half bridge arm driving circuit, the second voltage-stabilizing tube is connected between the collector of the second triode and the ground in parallel, the seventh resistor and the seventh capacitor are connected in series and then connected between the collector of the second triode and the ground in parallel, and the output of the right half bridge arm is the base of the second triode;
the right half bridge arm driving circuit is composed of a series-parallel branch consisting of a second resistor, a second feedback winding, a third resistor and a fifth capacitor, an input signal of the right half bridge arm driving circuit is an output signal of a series resonance inductor, one end of the second resistor is connected with the input signal, the other end of the second resistor is connected with one end of the second feedback winding, the other end of the second feedback winding is connected with one parallel end of the third resistor and the fifth capacitor, and the other parallel end of the third resistor and the fifth capacitor is the output of the right half bridge arm driving circuit;
the output of the right half bridge arm is mutually connected with the output of the right half bridge arm driving circuit;
the output part is composed of a series branch consisting of a secondary winding, a second diode and a third capacitor;
the output part and the left and right half bridge arms pass through a transformer turn-chain, and the output port of the output part is positioned between the second diode and the third capacitor.
3. The high efficiency, low ripple, high reliability micro high voltage power supply of claim 1, further comprising: the first primary winding, the second primary winding, the first feedback winding, the second feedback winding and the secondary winding are all windings of a known self-oscillation push-pull type transformer, and all the windings are wound on the same ferrite annular magnetic core.
4. The high efficiency, low ripple, high reliability micro high voltage power supply of claim 1, further comprising: the third triode in the series voltage stabilizing circuit is a PNP type triode.
5. The high efficiency, low ripple, high reliability micro high voltage power supply of claim 1, further comprising: the series resonance inductance is a differential mode inductance and is uniformly wound on an annular magnetic core with a powdered iron core by a single-stranded coil.
6. The high efficiency, low ripple, high reliability micro high voltage power supply of claim 1, further comprising: the acceleration oscillation starting circuit is connected in each bridge arm driving circuit in series: the acceleration oscillation starting circuit of the left half bridge arm is composed of a parallel branch consisting of a first resistor and a fourth capacitor, and the acceleration oscillation starting circuit of the right half bridge arm is composed of a parallel branch consisting of a third resistor and a fifth capacitor.
7. The high efficiency, low ripple, high reliability micro high voltage power supply of claim 1, further comprising: the base voltage judging circuit of the triode is that a resistor and a resistor for detecting emitter current are respectively connected in series between the emitter of the first triode and the emitter of the second triode, and a base voltage stabilizing diode and a voltage stabilizing diode are respectively connected in parallel between the base and the ground.
8. The high efficiency, low ripple, high reliability micro high voltage power supply of claim 1, further comprising: the quasi-resonant switching circuit is connected in parallel in each bridge arm: the quasi-resonance switch circuit of the left half bridge arm is formed by a series circuit of a sixth resistor and a sixth capacitor and is connected between the collector of the first triode and the ground in parallel; the quasi-resonant switching circuit of the right half bridge arm is formed by a series circuit of a seventh resistor and a seventh capacitor and is connected between the collector of the second triode and the ground in parallel.
9. The high efficiency, low ripple, high reliability micro high voltage power supply of claim 1, further comprising: the first triode and the second triode are NPN type triodes, and the third triode is a PNP type triode.
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