CN113098245B - Boost conversion circuit and converter for realizing input and output low ripple waves - Google Patents

Abstract

The invention provides a boost conversion circuit and a converter for realizing input and output low ripples, relates to the technical field of power electronic conversion, and solves the problems of reducing input and output ripples and voltage conversion at the same time.

Description

A boost converter circuit and converter for realizing low ripple in input and output

technical field

The present invention relates to the technical field of power electronic conversion, and more particularly, to a boost conversion circuit and a converter capable of realizing low input and output ripple.

Background technique

With the rapid development of society, in order to solve the problems of energy shortage and environmental pollution, green new energy sources such as solar energy and wind energy have been widely studied. The rational development and utilization of green renewable energy has become an urgent need for human beings. Such occasions are inseparable from power electronic conversion technology. In the process of power electronic conversion, there may be voltage or current fluctuations at both the input end and the output end. When the output current fluctuates, it will cause a high ripple of the output voltage Vo. The essence of the output voltage Vo ripple is due to the output The voltage changes at both ends of the magnetic components and the current fluctuations are caused. Due to the existence of high ripple, a capacitor with a large capacity is required to stabilize the fluctuation of the output voltage Vo within an acceptable range, and when the input current fluctuates within the range When it is large, it will affect the life of new energy sources such as photovoltaics and fuel cells. If the converter can achieve ultra-low input and output ripple, it can not only reduce the output capacitance, but also increase the life of new energy sources such as photovoltaics and fuel cells.

At present, in the field of power electronic conversion, the main low-ripple converters focus on output ultra-low ripple converters or input ultra-low ripple converters, and only simply realize output ultra-low ripple or input ultra-low ripple The structure of the wave converter is very complicated. For example, in the realization of ultra-low output ripple, on May 10, 2017, a Chinese invention patent (CN106655742A) disclosed an ultra-low ripple circuit control device. The feedback detection module and adjustment module are used to achieve ultra-low ripple output. In addition, there are some solutions to achieve ultra-low ripple output by adding a transformer magnetic column structure. The structures proposed by these solutions are complex; On the wave level, on October 17, 2017, a Chinese invention patent (CN104022632A) discloses an input zero-ripple converter. This scheme connects two identical BOOST converters in parallel (or two identical SEPIC converters in parallel) ), so that the trigger circuits of the two identical BOOST converters are in the push-pull-trigger state at the same time, and the input triangular current waveforms of the two converters are different in time by half a cycle, so that the current supplied by the DC power supply is ripple-free. Constant DC can achieve the purpose of ultra-low ripple input, but it is more complicated in control. In order to realize the input and output ultra-low ripple at the same time, it is necessary to connect an input ultra-low ripple converter to the input end of the output ultra-low ripple converter, which not only increases the size and cost of the converter, but also reduces the efficiency. , and some important transformation occasions also involve the requirements for the voltage size.

In order to achieve the purpose of reducing the input and output ripple at the same time, on May 17, 2017, a Chinese invention patent (CN106685223A) discloses a high-efficiency and low-ripple bidirectional Cuk conversion circuit. By combining the step-down Cuk conversion circuit and boost Type Cuk conversion circuit, the original Cuk converter is combined into a bidirectional converter, and the input end and the output end each have an inductance, so that the input and output current ripple is small, and the purpose of reducing the input and output ripple is realized, but this scheme In terms of performance, it belongs to the improvement of the conventional Cuk conversion circuit. First of all, the switch tube is not easy to control on and off, and it is impossible to reduce the input and output ripple while taking into account the voltage conversion requirements of important conversion occasions. Therefore, how to reduce the input voltage at the same time. The output ripple and voltage conversion have become an urgent problem to be solved.

SUMMARY OF THE INVENTION

In order to solve the problem of how to reduce the input and output ripple and voltage conversion at the same time, the present invention provides a boost conversion circuit and a converter that realizes low input and output ripple, so that the input and output current can achieve ultra-low ripple, while improving the output. voltage to meet the boost conversion requirements of the input and output ultra-low ripple in the application.

In order to achieve above-mentioned technical effect, technical scheme of the present invention is as follows:

A boost conversion circuit for realizing low input and output ripple, comprising: a DC input power supply V _in , an energy storage inductor L ₁ , a first power switch tube S ₁ , a second power switch tube S ₂ , and a first power diode D ₁ , the second power diode D ₂ , the freewheeling inductance L ₂ , the first capacitor C ₁ and the output circuit unit; the positive pole of the DC input power supply V _in is connected to one end of the energy storage inductance L ₁ , and the other ends of the energy storage inductance L ₁ are respectively connected to The drain of the _first power switch S1, the drain of the _second power switch S2 and the anode of the _first power diode D1 _; the cathode of the first power diode D1 is respectively connected to one end of the _freewheeling inductor L2 and the first _One end of a capacitor _C1 , the other end of the freewheeling inductor L2 is connected to the input end of the output circuit unit, and the other end of the first capacitor _C1 is connected to the source of the _second power switch tube S2 and the anode of the second power diode respectively ; The negative electrode of the DC input power supply V _in , the source of the _first power switch S1, the cathode of the _second power diode D2 and the output end of the output circuit unit are all grounded; the _first power switch S1 and the second _The gates of the power switch tubes S2 are both connected to external drive signals. The _first power switch tube S1 and the _second power switch tube S2 are turned on or turned off at the same time within the same switching period T _s . When the tube S1 and the _second power switch tube S2 are turned _on or turned off at the same time, the energy storage inductor L1 stores electric energy, and the output circuit unit outputs _an output voltage Vo higher than the input voltage of the DC input power V _in .

Preferably, the output circuit unit includes a second capacitor C _o and a load resistor R, and the second capacitor C _o is connected to the load resistor R in parallel.

Preferably, the boost converter circuit for realizing low input and output ripple includes two working processes in one switching period T _s : the operation when the _first power switch S1 and the _second power switch S2 are turned on at the same time Process, the working process when the first power switch tube S ₁ and the second power switch tube S ₂ are turned off at the same time.

Preferably, the time interval of the switching period T _s is t ₀ to t ₂ , wherein t ₀ represents the start time of the switching period T _s , t ₂ represents the end time of the switching period T _s , and t ₁ represents the first power switch tube At the end time point _of the working process when S1 and the _second power switch S2 are turned on at the same time, set the time duty ratio of the working process when the _first power switch S1 and the _second power switch S2 are turned on at the same time as D, then the working process time interval when the _first power switch S1 and the _second power switch S2 are turned on at the same time is DT _s , which is expressed as t ₀ -t ₁ ; set the _first power switch S1 and the second power switch S1 and the second The time duty ratio of the working process when the power switch tubes S2 are turned off at the same time is ₁ -D, then the time interval of the working process when the _first power switch tube S1 and the _second power switch tube S2 are turned off at the same time is (1 -D)T _s , expressed as t ₁ to t ₂ .

Preferably, the inductance values _of the energy storage inductance L1 and the _freewheeling inductance L2 are the same.

Preferably, set the drive signal of the _first power switch S1 as v _gs1 and the drive signal of the second power switch S ₂ as v _gs2 , in the time period from t ₀ to t ₁ in the switching period T _s , v _gs1 and v _gs2 are both high level, the _first power switch S1 and the _second power switch S2 are turned on at the same time, the DC input power supply V _in provides energy, and the first current i _L1 generated by the positive electrode flows through the energy storage inductor in turn L ₁ . The first power switch tube S ₁ returns to the negative electrode of the DC input power supply V _in , and the energy storage inductor L ₁ stores energy; the first capacitor C ₁ provides energy, and the current i _L2 from the anode of the first capacitor C ₁ It flows through the freewheeling inductor L ₂ , the second capacitor C _o , the load resistance R, the first power switch S1 and the _{second power switch S 2 in} sequence, and flows into the cathode of the first capacitor C ₁ . At this time, the first capacitor C ₁ releases energy, the freewheeling inductor L ₂ stores energy, the second capacitor C _o stores energy, and the load resistance R consumes energy.

Preferably, in the time period from t ₁ to t ₂ in the switching period T _s , both v _gs1 and v _gs2 are at a low level, the _first power switch S1 and the _second power switch S2 are turned off at the same time, and the DC The input power supply V _in provides energy, and the first current i _L1 generated by the positive electrode flows through the energy storage inductor L ₁ and the first power diode D ₁ in sequence, and is divided into the cathode of the first power diode D ₁ , and a part of the current passes through the first capacitor in turn. C ₁ and the second power diode D ₂ flow into the negative electrode of the DC input power supply V _in , and the other part of the current i _L2 flows through the freewheeling inductor L ₂ and flows into the second capacitor C _o and the load resistance R respectively, and flows into the DC input power supply V _in . negative electrode.

Preferably, the _first power switch S1 and the _second power switch S2 are MOS transistors.

Preferably, the _first power switch transistor S1 and the _second power switch transistor S2 are IGBT transistors.

The present invention also provides a boost converter for realizing low input and output ripple, and the converter includes the above-mentioned boost converter circuit for realizing low input and output ripple.

Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

(1) The boost converter circuit for realizing low input and output ripple proposed by the present invention has a simple structure, does not require the coordination of components with complex structures, and has low cost.

(2) The boost converter circuit for realizing low input and output ripple proposed by the present invention includes two power switches that are turned on or off at the same time, so it is easy to control at the trigger level, and the circuit also includes an energy storage inductor and a freewheeling current. Inductance, when the power switch tube is turned on or off at the same time, the input and output current can achieve ultra-low ripple, avoiding the traditional problem of connecting an additional input ultra-low ripple converter at the input end, reducing Cost and size of the converter.

(3) When the two power switch tubes are turned on or off at the same time, the energy storage inductor stores electric energy, the freewheeling inductor freewheels, and the output circuit unit outputs an output voltage Vo higher than the input voltage, which meets the input and output requirements in various applications. Boost conversion requirements at ultra-low ripple.

Description of drawings

FIG. 1 shows a schematic diagram of a boost converter circuit for realizing low ripple input and output proposed in an embodiment of the present invention;

FIG. 2 shows the signal waveform diagram of the driving signal v _gs1 of the first power switch tube S ₁ and the driving signal v _gs2 of the second power switch tube S ₂ in one switching cycle proposed in the embodiment of the present invention;

FIG. 3 is a modal diagram showing a working process of a boost converter circuit with low input and output ripple proposed in an embodiment of the present invention;

FIG. 4 shows a modal diagram of another working process of the boost converter circuit for realizing low ripple input and output proposed in the embodiment of the present invention;

FIG. 5 shows a waveform diagram of a simulation result of a boost circuit proposed in an embodiment of the present invention to achieve low input and output ripple.

Detailed ways

The accompanying drawings are for illustrative purposes only, and should not be construed as limitations on this patent;

In order to better illustrate this embodiment, some parts of the drawings are omitted, enlarged or reduced, which do not represent the actual size;

For those skilled in the art, it is understandable that descriptions of certain well-known contents in the accompanying drawings may be omitted.

The description of the positional relationship in the drawings is used for exemplary illustration, and should not be construed as a limitation on this patent;

The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

Example

As shown in FIG. 1 , a boost conversion circuit for realizing low input and output ripple, referring to FIG. 1 , the circuit includes: a DC input power supply V _in , an energy storage inductor L ₁ , a first power switch S ₁ , a second power supply The switch tube S ₂ , the first power diode D ₁ , the second power diode D ₂ , the freewheeling inductor L ₂ , the first capacitor C ₁ and the output circuit unit 1 ; the positive electrode of the DC input power supply V _in is connected to the energy storage inductor L _{1 One} end, the other end of the energy storage inductor L1 is respectively connected to the drain of the _first power switch S1, the drain of the _second power switch S2 and the anode of the _first power diode D1 _{; The} cathode is respectively connected to one end of the freewheeling inductor L2 and one end of the first capacitor _C1 , the other end of the freewheeling inductor L2 is connected to the input end of the output circuit unit ₁ , and the other end of the first capacitor _C1 is respectively connected to the second power switch The source of the tube S2 and the anode of the _second power diode; the cathode of the DC input power supply V _in , the source of the _first power switch tube S1, the cathode of the _second power diode D2 and the output of the output circuit unit 1 Both terminals are grounded; the gates of the _first power switch S1 and the _second power switch S2 are both connected to external drive signals, and the _first power switch S1 and the _second power switch S2 are in the same switching period T _s It is turned on or off at the same time, so in actual implementation, it is not necessary to consider the triggering and conduction sequence of different switches. It is easy to control at the trigger level and has higher use efficiency. The _first power switch S1 and the second power When the switches S2 are turned _on or off at the same time, the energy storage inductor L1 stores electric energy, and the output circuit unit ₁ outputs an output voltage Vo higher than the input voltage of the DC input power source V _in .

In this embodiment, the output circuit unit 1 includes a second capacitor C _o and a load resistor R, and the second capacitor C _o is connected to the load resistor R in parallel.

The first power switch S ₁ and the second power switch S ₂ are turned on or off at the same time within the same switching period T _s , so the boost converter circuit with low input and output ripple is realized within one switching period T _s It includes two working processes: the working process when the first power switch tube S ₁ and the second power switch tube S ₂ are turned on at the same time, and the work when the first power switch tube S ₁ and the second power switch tube S ₂ are turned off at the same time process.

As shown in FIG. 2, the abscissa in FIG. 2 represents time, and the ordinate simultaneously represents the driving signal v gs1 of the _first power switch S1 and the driving signal v _gs2 of the _second power switch _S2 (because the two signals are in the same The conduction conditions at the time are the same, so they can be represented on one coordinate axis at the same time), the time interval of the switching period T _s is t ₀ ~ t ₂ , where t ₀ represents the start time of the switching period T _s , and t ₂ represents the switching period. The end time of T _s , let _t1 represent the end time point of the working process when the _first power switch S1 and the _second power switch S2 are turned on at the same time, and let the _first power switch S1 and the second power switch S1 and the second power switch The time duty ratio of the working process when S2 is turned _on at the same time is D, then the time interval of the working process when the _first power switch S1 and the _second power switch S2 are turned on at the same time is _DTs , which is expressed as _t0 ~t ₁ ; set the time duty ratio of the working process when the _first power switch S1 and the _second power switch S2 are turned off at the same time as 1-D, then the _first power switch S1 and the second power switch The time interval of the working process when the tubes S ₂ are turned off at the same time is (1-D)T _s , expressed as t ₁ -t ₂ .

_In this embodiment, the energy storage inductance L1 and the _freewheeling inductance L2 have the same inductance value.

The working process when the first power switch S1 and the _second power switch S2 are turned on at the same time in _one switching period Ts, and the working process when the _first power switch S1 and the _second power switch S2 are turned off at the same time The working process is described separately as follows:

The driving signal of the _first power switch tube S1 is v _gs1 , and the driving signal of the second power switch tube S ₂ is v _gs2 . It can be seen from FIG. 2 that in the time period from t ₀ to t ₁ in the switching period T _s , Both v _gs1 and v _gs2 are high level, the _first power switch S1 and the _second power switch S2 are turned on at the same time, which means that the _first power switch S1 and the _second power switch S2 are turned on at the same time During the working process, the modal diagram of the circuit operation is shown in Figure 3. Referring to Figure 3, the dotted frame in Figure 3 is the circuit loop that is specifically turned on. Among them, the DC input power supply V _in provides energy, and the first A current i _L1 flows through the energy storage inductor L ₁ and the first power switch tube S ₁ in turn, and returns to the negative electrode of the DC input power V _in , where the energy storage inductor L ₁ stores energy; the first capacitor C ₁ provides energy, from the first The current i _L2 from the anode of the capacitor C ₁ flows through the freewheeling inductor L ₂ , the second capacitor C ₀ , the load resistor R, the first power switch tube S ₁ and the second power switch tube S ₂ in sequence, and flows into the first capacitor C At this time, the _first capacitor _C1 releases energy, the freewheeling inductor L2 stores energy, the _second capacitor _{C0 stores} energy, and the load resistor R consumes energy.

It can be seen from FIG. 2 that during the time period from t ₁ to t ₂ in the switching period T _s , v _gs1 and v _gs2 are both low levels, and the _first power switch S1 and the _second power switch S2 are turned off at the same time , this is the working process when the first power switch tube S ₁ and the second power switch tube S ₂ are turned off at the same time, the modal diagram of the circuit operation is shown in FIG. The circuit loop, in which the DC input power supply V _in provides energy, the first current i _L1 generated by the positive electrode flows through the energy storage inductor L ₁ and the first power diode D ₁ in turn, and is shunted at the cathode of the first power diode D ₁ , according to the basic Erhoff's current law, in which part of the current flows into the negative electrode of the DC input power supply V _in through the first capacitor C ₁ and the second power diode D ₂ in sequence, and the other part of the current i _L2 flows into the second capacitor respectively after passing through the freewheeling inductor L ₂ C _o and load resistance R, flow into the negative pole of the DC input power supply V _in .

Due to the existence _of the energy storage inductance L1 and the freewheeling inductance L2, the circuits under the _two operating processes corresponding to FIG. 3 and FIG. 4 can maintain the first current i _L1 (input current), the current i in one switching cycle _L2 (output current) has low ripple to achieve low input and output ripple.

In this embodiment, the _first power switch transistor S1 and the _second power switch transistor S2 can be MOS transistors or IGBT transistors.

In order to further verify the validity of the proposed circuit of the present invention, in the present embodiment, simulate in the Simplis simulation software, wherein each parameter of the circuit is set as follows:

The voltage of the DC input power V _in is 36V, the load resistance R is 100Ω, the inductance value of the energy storage inductor L1 is set to _150uH , the inductance value of the freewheeling inductor L2 is set to _150uH , the first capacitor _C1 is 100uF, the second The capacitor C _o is 220uF, and the switching frequency is 50kHz. The waveform diagram of the simulation results is shown in Figure 5. See Figure 5. There are 5 layers of waveforms from top to bottom. The horizontal direction of each layer refers to the switching period, and the first layer is the first The signal waveforms of the drive signal v _{gs1 of} the power switch S1 and the drive signal v _gs2 of the _second power switch S2, the low level is 0, the high level is 14.5, and the second layer is the voltage of the DC input power supply V _in Waveform, the third layer is the waveform of the first current i _L1 , the fourth layer is the waveform of the output voltage Vo, and the fifth layer is the waveform of the current i _L2 (output current). First, the _first power switch tube S1 and the second power switch _Both tubes S2 are turned off, the voltage of the DC input power V _in is always 36V, the first current i _L1 has low ripple fluctuation between 2 and 4A, the output voltage is 100V, much higher than 36V, the current i _L2 ( output current) is 1A; when the signal waveforms of the _first power switch S1 and the _second power switch S2 are at a high level, both the _first power switch S1 and the _second power switch S2 are turned on, and the DC The voltage of the input power V _in is still 36V, and the first current i _L1 still maintains a low ripple fluctuation between 2 and 4A. At this time, the output voltage is 100V, which is much higher than 36V, and the current i _L2 (output current) is still 1A. Therefore, it can be seen that only by controlling the turn-on or turn-off of the _first power switch S1 and the _second power switch S2 in this circuit at the same time, the low ripple fluctuation of the input and output voltage and current can be realized at the same time, without the need for It is necessary to additionally connect the input (or output) low ripple conversion circuit, which is easy to control and reduces the size and cost, and the output voltage is always much higher than the input voltage, which can meet the boost conversion when the input and output ultra-low ripple is applied in various applications. Require.

The present invention also provides a boost converter for realizing low input and output ripple, and the converter includes the above-mentioned boost converter circuit for realizing low input and output ripple.

Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those of ordinary skill in the art, changes or modifications in other different forms can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (10)

1. A boost converter circuit for realizing low ripple in input and output, characterized in that it comprises: DC input power supply V _in , energy storage inductor L ₁ , first power switch tube S ₁ , second power switch tube S ₂ , The first power diode D ₁ , the second power diode D ₂ , the freewheeling inductor L ₂ , the first capacitor C ₁ and the output circuit unit (1); the positive electrode of the DC input power source V _in is connected to one end of the energy storage inductor L ₁ , and the storage _The other end of the energy inductance L1 is respectively connected to the drain of the _first power switch S1, the drain of the _second power switch S2 and the anode of the _first power diode D1 _; the cathodes of the first power diode D1 are respectively connected _One end of the freewheeling inductor L2 and one end of the first capacitor _C1 , the other end of the freewheeling inductor L2 is connected to the input end of the output circuit unit ( ₁ ), and the other end of the first capacitor _C1 is respectively connected to the second power switch tube The source of S2 and the anode of the _second power diode D2 _; the cathode of the DC input power supply V _in , the source of the _first power switch S1, the cathode of the _second power diode D2 and the output circuit unit (1 ) outputs are grounded; the gates of the _first power switch S1 and the _second power switch S2 are both connected to external drive signals, and the _first power switch S1 and the _second power switch S2 are in the same switch During the period T _s , it is turned on or off at the same time. When the _first power switch S1 and the _second power switch S2 are turned on or off at the same time, the energy storage inductor L1 stores electric energy, and the output circuit unit ( ₁ ) outputs an output voltage Vo higher than the input voltage of the DC input power supply V _in . 2. The boost converter circuit for realizing low input and output ripple according to claim 1, wherein the output circuit unit (1) comprises a second capacitor C _o and a load resistance R, and the second capacitor C _oIn parallel with the load resistor R. 3. The boost converter circuit for realizing low input and output ripple according to claim 2, wherein the boost converter circuit for realizing low input and output ripple includes two working processes in one switching period T _s : the working process when the _first power switch S1 and the _second power switch S2 are turned on at the same time, and the working process when the _first power switch S1 and the _second power switch S2 are turned off at the same time. 4 . The boost converter circuit for realizing low input and output ripple according to claim 3 , wherein the time interval of the switching period T _s is t ₀ -t ₂ , wherein t ₀ represents the start of the switching period T _s time, t ₂ represents the end time of the switching period T _s , let t ₁ represent the end time of the working process when the _first power switch S1 and the _second power switch S2 are turned on at the same time, let the first power switch S ₁ and the _second power switch S2 are turned on at the same time when the duty cycle of the working process is D, then the working process time interval when the _first power switch S1 and the _second power switch S2 are turned on at the same time is DT _s , expressed as t ₀ -t ₁ ; assuming that the time duty ratio of the working process when the _first power switch S1 and the _second power switch S2 are turned off at the same time is 1-D, then the first power switch The working process time interval when S ₁ and the second power switch tube S ₂ are simultaneously turned off is (1-D)T _s , which is expressed as t ₁ -t ₂ . 5 . The boost converter circuit for realizing low input and output ripple according to claim 4 , wherein the energy storage inductor L ₁ and the freewheeling inductor L ₂ have the same inductance value. 6 . 6 . The boost converter circuit for realizing low input and output ripple according to claim 5 , wherein the driving signal of the _first power switch S1 is set to be v _gs1 , and the driving signal of the second power switch S2 is ₆ . is v _gs2 , in the time period from t ₀ to t ₁ in the switching period T _s , v _gs1 and v _gs2 are both high level, the _first power switch S1 and the _second power switch S2 are turned on at the same time, The DC input power source V _in provides energy, and the first current i _L1 generated by the positive electrode flows through the energy storage inductor L ₁ and the first power switch tube S ₁ in turn, and returns to the negative electrode of the DC input power source V _in , where the energy storage inductor L ₁ stores energy. ; The first capacitor C ₁ provides energy, and the current i _L2 from the anode of the first capacitor C ₁ flows through the freewheeling inductor L ₂ , the second capacitor C _o , the load resistor R, the first power switch tube S ₁ and the second The power switch tube S ₂ flows into the cathode of the first capacitor C ₁ . At this time, the first capacitor C ₁ releases energy, the freewheeling inductor L ₂ stores energy, the second capacitor C _o stores energy, and the load resistor R consumes energy. 7 . The boost converter circuit for realizing low input and output ripple according to claim 6 , wherein, in the time period from t ₁ to t ₂ in the switching period T _s , both v _gs1 and v _gs2 are low voltages. 8 . At the same time, the _first power switch S1 and the _second power switch S2 are turned off at the same time, the DC input power supply V _in provides energy, and the first current i _L1 generated by the positive electrode flows through the energy storage inductor L1 and the _first power diode in turn. D ₁ , shunted at the cathode of the first power diode D ₁ , a part of the current flows into the cathode of the DC input power V _in through the first capacitor C ₁ and the second power diode D ₂ in turn, and the other part of the current i _L2 passes through the freewheeling inductor After L ₂ , it flows into the second capacitor C _o and the load resistor R respectively, and flows into the negative pole of the DC input power supply V _in . 8 . The boost converter circuit for realizing low input and output ripple according to claim 7 , wherein the _first power switch S1 and the _second power switch S2 are MOS transistors. 9 . 9 . The boost converter circuit for realizing low input and output ripple according to claim 7 , wherein the _first power switch S1 and the _second power switch S2 are IGBT transistors. 10 . 10 . A boost converter for realizing low input and output ripple, characterized in that, the converter comprises the boost converter circuit for realizing low input and output ripple according to any one of claims 1 to 9 .

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