CN109245539B - Voltage superposition type boost circuit - Google Patents
Voltage superposition type boost circuit Download PDFInfo
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- CN109245539B CN109245539B CN201811151023.7A CN201811151023A CN109245539B CN 109245539 B CN109245539 B CN 109245539B CN 201811151023 A CN201811151023 A CN 201811151023A CN 109245539 B CN109245539 B CN 109245539B
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
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- 238000004804 winding Methods 0.000 claims description 13
- 230000005284 excitation Effects 0.000 claims description 8
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- 238000010586 diagram Methods 0.000 description 11
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- 230000005540 biological transmission Effects 0.000 description 6
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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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—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 with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
Abstract
A voltage superposition type booster circuit can solve the technical problems of larger switching loss and low efficiency of the traditional booster circuit. The power switching tube performs chopping operation by controlling a driving circuit, then performs isolation and voltage conversion through a transformer, and finally outputs stable direct-current voltage through a rectifying circuit and an output filter circuit; the isolated DC-DC converter controls the driving circuit to control the working state of the driving circuit through a grounding switch; the input power supply voltage is connected to a tap of a transformer secondary of the isolated DC-DC converter through a superposition voltage channel after passing through the input filter circuit. The invention has the advantages of small circuit loss, small current stress on the device and high power density, and is particularly suitable for high-power occasions with low boosting ratio.
Description
Technical Field
The invention relates to the field of booster circuits, in particular to a voltage superposition type booster circuit.
Background
The booster circuit can make the output voltage higher than the input voltage through certain circuit structure and control, and is used as a basic functional circuit, and the booster circuit is widely applied to the fields of aviation, aerospace, ships, weaponry, consumer electronics and the like. At present, the circuit schemes capable of realizing the boosting function are mainly divided into two types, namely an isolation scheme and a non-isolation scheme, wherein the non-isolation scheme mainly comprises a Boost, cuk, sepic circuit and the like, and the isolation scheme mainly comprises a forward converter, a flyback converter, a push-pull converter, a half-bridge converter, a full-bridge converter and the like. However, the above power supply has a high efficiency of 97% or more, which is difficult to obtain due to the presence of switching loss. On the other hand, since the booster circuit device is subjected to a large voltage-current stress, an increase in circuit cost or a decrease in reliability is caused. In addition, the volume of the transformer is increased along with the increase of the power of the converter, and the volume of the whole circuit is also increased, so that the use is inconvenient.
Disclosure of Invention
The voltage superposition type booster circuit provided by the invention can solve the technical problems of larger switching loss and low efficiency of the traditional booster circuit.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the voltage superposition type booster circuit comprises an isolation type DC-DC converter and a superposition voltage channel, wherein the input power supply voltage of the isolation type DC-DC converter is firstly subjected to high-frequency component suppression by an input filter circuit and then is sent to a power switching tube, the power switching tube is subjected to chopping operation by a control driving circuit, then is subjected to isolation and voltage transformation by a transformer, and finally is subjected to stable direct-current voltage output by a rectifying circuit and an output filter circuit; the isolated DC-DC converter controls the driving circuit to control the working state of the driving circuit through a grounding switch;
the input power supply voltage is connected to a tap of a transformer secondary of the isolated DC-DC converter through a superposition voltage channel after passing through the input filter circuit.
Further, the superimposed voltage channel is a wire.
Furthermore, the superimposed voltage channel adopts a low-dropout voltage regulator, specifically comprises the steps that the input voltage after being subjected to input filtering circuit is divided by a first resistor and a second resistor, the detected input voltage signal is sent to an operational amplifier, the output of the operational amplifier is connected to the voltage control end of the low-dropout voltage regulator, a grounding switch is connected to the low-dropout voltage regulator and the enabling end of the DC-DC converter to control the low-dropout voltage regulator to be closed, and the output end of the low-dropout voltage regulator is connected to a tap of a secondary transformer of the isolated DC-DC converter.
Furthermore, the superimposed voltage channel adopts a synchronous Buck converter, the input voltage after the input filter circuit is connected to the input end of the synchronous Buck converter, the output end of the synchronous Buck converter is connected to the tap of the secondary transformer of the isolated DC-DC converter, and the grounding switch is connected to the synchronous Buck converter and the enabling end of the DC-DC converter to control the synchronous Buck converter and the DC-DC converter to be closed.
Further, the isolated DC-DC converter is a single-tube forward DC converter, in which, the input power voltage is chopped through the switching tube after passing through the input filter capacitor, when the switching tube is turned on, the transformer transfers energy to the load, and outputs DC voltage through the rectifying circuit and the filter circuit, in which, the input filter capacitor and the output filter capacitor are grounded respectively.
Further, the isolated DC-DC converter is a single-tube flyback DC converter, in which an input power voltage is chopped through a switching tube after passing through an input filter capacitor, when the switching tube is turned on, the transformer stores energy, when the switching tube is turned off, the transformer transmits energy to a secondary, the DC voltage is output through a rectifying circuit and a filter circuit, and the input filter capacitor and the output filter capacitor are grounded respectively.
Further, the isolated DC-DC converter is a push-pull DC converter, where after an input power voltage passes through an input filter capacitor, the first switching tube and the second switching tube are alternately turned on to perform chopping operation, the transformer always transmits energy to the secondary, the DC voltage is output through the rectifier circuit and the filter circuit, the input filter capacitor and the output filter capacitor are grounded respectively, and the source stages of the first switching tube and the second switching tube are grounded in common.
Furthermore, the isolated DC-DC converter is a half-bridge DC converter, wherein the input power supply voltage is subjected to chopping operation through a first switch tube and a second switch tube after passing through a first input filter capacitor and a second input filter capacitor, the first filter capacitor and the second filter capacitor are simultaneously used for equally dividing the input voltage, energy is transmitted through a transformer, the direct current voltage is output through a rectifying circuit and a filter circuit, and the input filter capacitor and the output filter capacitor are respectively grounded.
Furthermore, the isolated DC-DC converter is a full-bridge DC converter, wherein the input power supply voltage is subjected to chopping operation through the first switch tube, the second switch tube, the third switch tube and the fourth switch tube after passing through the input filter capacitor, energy is transmitted through the transformer, the direct-current voltage is output through the rectifying circuit and the filter circuit, and the input filter capacitor and the output filter capacitor are respectively grounded.
Further, the isolated DC-DC converter is a half-bridge LLC DC converter, wherein the input voltage after passing through the input filter capacitor is subjected to chopping operation through a first switch tube and a second switch tube, energy is transmitted by transformers connected to two ends of the second switch tube, the direct-current voltage is output through a rectifying circuit and a filter circuit, the input filter capacitor and the output filter capacitor are respectively grounded, a primary transformer winding of the half-bridge LLC DC converter is connected with a resonance capacitor in series, the transformer further comprises a primary leakage inductance and an excitation inductance of the transformer, and a primary soft switch is realized by a resonance unit consisting of the resonance capacitor, the primary leakage inductance and the excitation inductance.
Preferably, the isolated DC-DC converter is a full-bridge LLC DC converter, which includes chopping operation of an input voltage through four switching tubes after passing through an input filter capacitor, energy is transferred by a transformer bridged between two bridge arms, DC voltage is output through a rectifier circuit and a filter circuit, the input filter capacitor and the output filter capacitor are respectively grounded, a primary transformer winding of the full-bridge LLC DC converter is serially connected with a resonance capacitor, and the full-bridge LLC DC converter further includes a primary leakage inductance and an excitation inductance of the transformer, and a primary soft switch is realized by a resonance unit formed by the resonance capacitor, the primary leakage inductance and the excitation inductance.
According to the technical scheme, the invention discloses a high-efficiency voltage superposition type boost circuit which comprises an isolated DC-DC converter and a superposition voltage channel, wherein the secondary reference zero level of an isolated DC-DC circuit transformer is lifted to an input voltage through the superposition voltage channel so as to realize the boost output function of the circuit. The circuit has small loss, small current stress on the device and high power density, and is particularly suitable for high-power occasions with low step-up ratio.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention;
FIG. 2 is a schematic diagram of the superimposed voltage channel of the present invention as a direct connection;
FIG. 3 is a schematic diagram of a superimposed voltage channel of the present invention as a LDO;
FIG. 4 is a schematic diagram of the superimposed voltage channel synchronous Buck converter of the present invention;
FIG. 5 is a schematic diagram of an isolated DC-DC converter of the present invention as a single-tube forward DC converter;
FIG. 6 is a schematic diagram of an isolated DC-DC converter of the present invention as a single-tube flyback DC converter;
FIG. 7 is a schematic diagram of an isolated DC-DC converter of the present invention as a push-pull DC converter;
FIG. 8 is a schematic diagram of an isolated DC-DC converter of the present invention as a half-bridge DC converter;
FIG. 9 is a schematic diagram of an isolated DC-DC converter of the present invention as a full-bridge DC converter;
FIG. 10 is a schematic diagram of an isolated DC-DC converter of the present invention as a half-bridge LLC DC converter;
fig. 11 is a schematic diagram of an isolated DC-DC converter of the present invention as a full bridge LLC DC converter.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention.
In order to solve the problem of the traditional booster circuit, the embodiment of the invention provides a high-efficiency voltage superposition type booster circuit which can reduce the switching loss of a power device under the same power conversion, reduce the current stress born by the device, reduce the circuit volume and realize high-efficiency booster conversion.
As shown in fig. 1, the voltage superposition type boost circuit in this embodiment is composed of an isolated DC-DC converter and a superposition voltage channel. The input direct current power supply of the isolated DC-DC converter is firstly subjected to high-frequency component suppression by an input filter circuit and then is sent to a power switch tube, the switch tube is subjected to chopping operation by a control driver, then is subjected to isolation and voltage conversion by a transformer, and finally is subjected to stable direct current voltage output by a rectifying and filtering circuit, and the switch K can control the converter to be turned off. The input voltage is connected into the tap of the secondary of the isolated DC-DC converter transformer through the voltage superposition channel to realize the superposition of the voltage, and the total output voltage is equal to the input voltage V in Adding the output voltage V of the isolated DC-DC o ', V out ＝V in +V o ' thereby achieving a boost output of the circuit.
The output voltage of the superimposed voltage channel is V in Only the output voltage of the isolated DC-DC converter is considered as V o '＝V out -V in Let the output current of the booster circuit be I out The transmission power of the isolated DC-DC converter and the superimposed voltage channel is P respectively 1 ＝(V out -V in )×I out And P 2 ＝V in ×I out The input power of the booster circuit is
Wherein eta 1 And eta 2 The energy transmission efficiency of the isolated DC-DC converter and the superimposed voltage channel are respectively.
Therefore, the total conversion efficiency of the booster circuit is
Since the power transmitted through the superimposed voltage channels is almost lossless, η 2 Approximately equal to 1, can obtain
As can be seen from the above, the booster circuit only uses the isolated DC-DC converter to transmit power P 1 The loss amount Δp of (a) 1 I.e. to power P 1 +P 2 And therefore the overall circuit can achieve higher operating efficiency.
Meanwhile, as a part of total transmission power is directly provided through input voltage, the transmission power of the isolated DC-DC converter is reduced, so that the current stress born by the device is greatly reduced, the volumes of the magnetic core and the coil of the transformer are correspondingly reduced, and the circuit components are beneficial to the improvement of the type selection and the power density.
In order to realize the voltage superposition type booster circuit, a method for realizing the superposition voltage channel section and the isolated DC-DC converter section will be described in detail below.
1. Method for realizing superimposed voltage channel
The superposition voltage channel is connected with the secondary winding tap of the isolated DC-DC converter transformer to boost the output voltage of the circuit, which is a key part of the superposition type booster circuit for realizing high-efficiency conversion, so that the channel is ensured to be very high-efficiency power conversion at first. On this basis, in order to maximize the advantage of the low-loss power transmission of the superimposed voltage channel, the output voltage of the channel should be as close as possible to the input voltage Vin.
Fig. 2 shows that the superimposed voltage path is a direct connection method, i.e. the input voltage is directly connected to the secondary tap of the transformer through a wire, which does not require additional devices and can realize power transmission with little loss.
In order to further control the on-off of the superimposed voltage channel and the output current and voltage, the following two realization methods are developed.
Fig. 3 shows a method of using a low dropout regulator in a superimposed voltage channel, wherein the efficiency of the low dropout regulator LDO is approximately equal to the ratio of the output voltage to the input voltage, so that the LDO has very high conversion efficiency in an operating state where the output voltage is close to the input voltage. R1 and R2 detect input voltage, and the output voltage of the LDO always follows Vin change through U1, so that the LDO always keeps in a high-efficiency working state with low voltage difference, and the switch K controls the closing of the LDO and the DC-DC converter.
The input voltage Vin is divided through resistors R1 and R2, the detected input voltage signal is sent to an operational amplifier U1, the output of the U1 is connected to an LDO voltage control end, the LDO output voltage always follows Vin to change, the LDO is always kept in a high-efficiency working state with low voltage difference, and a switch K is connected to the LDO and an enabling end of a DC-DC converter to control the switch K to be turned off.
Fig. 4 shows a synchronous Buck converter used in the superimposed voltage channel, which is set to a large duty cycle mode, so that the output voltage is close to Vin, and a switch K controls the synchronous Buck converter and the DC-DC converter to turn off. The synchronous Buck converter may have a conversion efficiency of up to 99%, the method may distribute the output power of the superimposed voltage channels, and may regulate the output voltage in real time.
2. Isolation type DC-DC converter implementation method
According to different application scenes, the isolated DC-DC converter can be selected from a single-tube forward DC converter, a single-tube flyback DC converter, a push-pull DC converter, a half-bridge DC converter, a full-bridge DC converter, a half-bridge LLC DC converter and a full-bridge LLC DC converter.
Fig. 5 shows that the isolated DC-DC converter is a single-tube forward DC converter, and the superimposed output voltage vout= (d×vin)/n+vin (D is the on duty ratio, n is the turn ratio of the transformer, vin is the power input voltage, vout is the output voltage of the boost circuit, and the same applies below), and the output end of the superimposed voltage channel is connected to the low-voltage side of the secondary winding of the transformer. The single-tube forward DC converter is mainly applied to low-voltage high-current occasions.
Specifically, the input voltage Vin after passing through the input filter capacitor Ci is chopped through the switching tube Q, when the switching tube Q is turned on, the transformer T transfers energy to the load, and the dc voltage Vout is output after passing through the rectifying circuits D1 and D2 and the filter circuit L, co, and the input filter capacitor Ci and the output filter capacitor Co are grounded respectively.
Fig. 6 shows that the isolated DC-DC converter is a single-tube flyback DC converter, and the output voltage vout= [ vin×d/(1-D) ]/n+vin, and the output end of the superimposed voltage channel is connected to the low-voltage side of the secondary winding of the transformer. The single-tube flyback DC converter is mainly applied to occasions such as high-voltage small-current output.
The method specifically comprises the steps that an input voltage Vin passing through an input filter capacitor Ci is subjected to chopping operation through a switching tube Q, when the switching tube Q is on, a transformer T stores energy, and when the switching tube Q is off, the transformer T transmits energy to a secondary stage, a direct-current voltage Vout is output through a rectifying circuit D and a filter circuit Co, and the input filter capacitor Ci and the output filter capacitor Co are respectively grounded.
Fig. 7 shows an isolated DC-DC converter, which is a push-pull DC converter, with an output voltage vout= (2×d×vin)/n+vin, and an output terminal of a superimposed voltage channel connected to a center tap of a secondary winding of the transformer. Push-pull converters are well suited for medium power applications.
Specifically, after an input voltage Vin passes through an input filter capacitor Ci, switching tubes Q1 and Q2 are alternately conducted in turn to perform chopping operation, a transformer T always transmits energy to a secondary, a direct-current voltage Vout is output through rectifier circuits D1 and D2 and a filter circuit L, co, the input filter capacitor Ci and the output filter capacitor Co are respectively grounded, and source stages of Q1 and Q2 are grounded.
Fig. 8 shows an isolated DC-DC converter, which is a half-bridge DC converter, with an output voltage vout= (d×vin)/n+vin, and an output terminal of the superimposed voltage channel is connected to a center tap of the secondary winding of the transformer. The half-bridge DC converter is mainly applied to high input voltage and high power occasions.
Specifically, the chopper circuit comprises an input voltage Vin passing through input filter capacitors C1 and C2, chopping operation is carried out through switching tubes Q1 and Q2, the C1 and C2 are simultaneously used for equally dividing Vin, energy is transmitted through a transformer T, direct-current voltage Vout is output through rectifier circuits D1 and D2 and a filter circuit L, co, and the input filter capacitor C2 and the output filter capacitor Co are respectively grounded.
Fig. 9 shows an isolated DC-DC converter, which is a full-bridge DC converter, with an output voltage vout=2× (d×vin)/n+vin, and a superimposed voltage channel output terminal connected to the center tap of the secondary winding of the transformer. The full-bridge DC converter is mainly applied to occasions such as high-power output.
Specifically, the chopper circuit comprises an input voltage Vin passing through an input filter capacitor Ci, chopping operation is carried out through switching tubes Q1-Q4, energy is transferred through a transformer T, a direct-current voltage Vout is output through rectifier circuits D1 and D2 and a filter circuit L, co, and the input filter capacitor Ci and the output filter capacitor Co are respectively grounded.
Fig. 10 shows that the isolated DC-DC converter is a half-bridge LLC DC converter, and the output voltage vout= (d×vin)/n+vin is superimposed on the output voltage of the channel, which is connected to the center tap of the secondary winding of the transformer. LLC converters are mainly used for soft switching conversion.
Specifically, the chopper circuit comprises an input voltage Vin passing through an input filter capacitor Ci, chopping operation is carried out through switching tubes Q1 and Q2, energy is transferred through a transformer T connected to two ends of the Q2, a direct-current voltage Vout is output through rectifier circuits D1 and D2 and a filter capacitor Co, and the input filter capacitor Ci and the output filter capacitor Co are respectively grounded. The primary transformer winding is connected in series with resonance capacitors Cr, lr and Lm which are respectively the primary leakage inductance and the excitation inductance of the transformer, and the primary and secondary soft switch is realized through a resonance unit consisting of the Cr, the Lr and the Lm.
Fig. 11 shows an isolated DC-DC converter, which is a full-bridge LLC DC converter, with an output voltage vout=2× (d×vin)/n+vin, and a superimposed voltage channel output terminal connected to the center tap of the secondary winding of the transformer.
The energy is transferred by a transformer T connected between two bridge arms in a bridging way, the direct-current voltage Vout is output through rectifier circuits D1 and D2 and a filter capacitor Co, and the input filter capacitor Ci and the output filter capacitor Co are respectively grounded. The primary transformer winding is connected in series with resonance capacitors Cr, lr and Lm which are respectively the primary leakage inductance and the excitation inductance of the transformer, and the primary and secondary soft switch is realized through a resonance unit consisting of the Cr, the Lr and the Lm.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. The utility model provides a voltage stack formula boost circuit, includes isolation type DC-DC converter, its characterized in that: the power switching tube performs chopping operation by controlling the driving circuit, then performs isolation and voltage conversion by the transformer, and finally outputs stable direct current voltage by the rectifying circuit and the output filter circuit; the isolated DC-DC converter controls the driving circuit to control the working state of the driving circuit through a grounding switch;
the input power supply voltage is connected to a tap of a transformer secondary of the isolated DC-DC converter through a superposition voltage channel after passing through the input filter circuit;
the superimposed voltage channel adopts any one of a low-dropout voltage regulator or a synchronous Buck converter;
when the superimposed voltage channel adopts a low-dropout voltage regulator, the input voltage after passing through an input filter circuit is divided by a first resistor and a second resistor, the detected input voltage signal is sent to an operational amplifier, the output of the operational amplifier is connected to the voltage control end of the low-dropout voltage regulator, a grounding switch is connected to the low-dropout voltage regulator and the enabling end of a DC-DC converter to control the low-dropout voltage regulator to be closed, and the output end of the low-dropout voltage regulator is connected to a tap of a secondary transformer of the isolated DC-DC converter;
when the superimposed voltage channel adopts a synchronous Buck converter, an input voltage after the input filter circuit is connected to the input end of the synchronous Buck converter, the output end of the synchronous Buck converter is connected to a tap of a transformer secondary of the isolated DC-DC converter, and a grounding switch is connected to the synchronous Buck converter and an enabling end of the DC-DC converter to control the synchronous Buck converter and the DC-DC converter to be closed.
2. The voltage-superimposed booster circuit of claim 1 wherein: the isolated DC-DC converter is a single-tube forward DC converter, wherein an input power supply voltage is subjected to chopping operation through a switching tube after passing through an input filter capacitor, when the switching tube is turned on, the transformer transmits energy to a load, and the DC voltage is output through a rectifying circuit and a filter circuit, wherein the input filter capacitor and the output filter capacitor are respectively grounded.
3. The voltage-superimposed booster circuit of claim 1 wherein: the isolated DC-DC converter is a single-tube flyback DC converter, wherein an input power supply voltage is subjected to chopping operation through a switching tube after passing through an input filter capacitor, when the switching tube is on, the transformer stores energy, when the switching tube is off, the transformer transmits energy to a secondary stage, the DC voltage is output through a rectifying circuit and a filter circuit, and the input filter capacitor and the output filter capacitor are respectively grounded.
4. The voltage-superimposed booster circuit of claim 1 wherein: the isolated DC-DC converter is a push-pull DC converter, wherein after an input power supply voltage passes through an input filter capacitor, a first switching tube and a second switching tube are alternately conducted to carry out chopping operation, the transformer always transmits energy to a secondary stage, the DC voltage is output through a rectifying circuit and a filter circuit, the input filter capacitor and the output filter capacitor are respectively grounded, and the source stages of the first switching tube and the second switching tube are grounded in common.
5. The voltage-superimposed booster circuit of claim 1 wherein: the isolated DC-DC converter is a half-bridge DC converter, wherein an input power supply voltage is subjected to chopping operation through a first switch tube and a second switch tube after passing through a first input filter capacitor and a second input filter capacitor, the first filter capacitor and the second filter capacitor are simultaneously used for equally dividing the input voltage, energy is transmitted through a transformer, the direct current voltage is output through a rectifying circuit and a filter circuit, and the input filter capacitor and the output filter capacitor are respectively grounded.
6. The voltage-superimposed booster circuit of claim 1 wherein: the isolated DC-DC converter is a full-bridge DC converter, wherein the input power supply voltage is subjected to chopping operation through a first switching tube, a second switching tube, a third switching tube and a fourth switching tube after passing through an input filter capacitor, energy is transmitted through a transformer, the DC voltage is output through a rectifying circuit and a filter circuit, and the input filter capacitor and the output filter capacitor are respectively grounded.
7. The voltage-superimposed booster circuit of claim 1 wherein: the isolated DC-DC converter is a half-bridge LLC direct current converter, wherein the input voltage after passing through an input filter capacitor is subjected to chopping operation through a first switch tube and a second switch tube, energy is transmitted by transformers connected to two ends of the second switch tube, the direct current voltage is output through a rectifying circuit and a filter circuit, the input filter capacitor and the output filter capacitor are respectively grounded, a primary transformer winding of the half-bridge LLC direct current converter is connected with a resonance capacitor in series, the transformer further comprises a primary leakage inductance and an excitation inductance of the transformer, and a resonance unit formed by the resonance capacitor, the primary leakage inductance and the excitation inductance realizes primary and secondary soft switching.
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| CN110545094A (en) * | 2019-08-28 | 2019-12-06 | 深圳市法拉第电驱动有限公司 | power semiconductor switching device driving power supply circuit device and starting method thereof |
| CN113691134B (en) * | 2020-05-19 | 2023-10-27 | 台达电子工业股份有限公司 | Power conversion device and power supply system |
| CN111740406A (en) * | 2020-06-04 | 2020-10-02 | 湖南大学 | Island inverter power supply, switching control method and system |
| CN114415774A (en) * | 2022-01-21 | 2022-04-29 | 南京元络芯科技有限公司 | LDO circuit for solving power-on transition of LDO |
| CN114825942B (en) * | 2022-06-23 | 2023-03-24 | 苏州时代新安能源科技有限公司 | Boost circuit and electronic device |
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| US6208529B1 (en) * | 1999-05-03 | 2001-03-27 | Argus Technologies Ltd. | Zero voltage switching buck derived converter |
| CN101483390A (en) * | 2008-01-07 | 2009-07-15 | 光宝科技股份有限公司 | Electric power supply apparatus capable of regulating output voltage |
| CN203056977U (en) * | 2012-12-18 | 2013-07-10 | 中科恒源科技股份有限公司 | Boost isolation type DC-DC converter |
| CN208739029U (en) * | 2018-09-29 | 2019-04-12 | 中国电子科技集团公司第四十三研究所 | A kind of voltage superposition formula booster circuit |
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