TW201101659A - Boost/buck converting device, boost/buck converter, and control module thereof - Google Patents

Abstract

A boost/buck converter is disclosed, which comprises: a first diode, a power switch set, a first energy-storage capacitor, a second energy-storage capacitor, a second diode, an energy-storage inductor, and an output capacitor. The power switch set has a first switch, a second switch, a third switch, and a fourth switch. When the first switch and the third switch are off, and the second switch and the fourth switch are on, the input voltage delivers energy to the first energy-storage capacitor, and the second energy-storage capacitor delivers energy to the energy-storage inductor and the output capacitor. When the first switch and the third switch are on, and the second switch and the fourth switch are off, the first energy-storage capacitor releases the energy to the second energy-storage capacitor, and the energy-storage inductor and the output capacitor release energy to output a negative voltage.

Description

201101659 VI. Description of the Invention: [Technical Field] The present invention relates to a buck-boost converter, and more particularly to a buck-boost converter having a negative voltage output. [Prior Art] With the advancement of technology, the application and demand of negative voltage power supplies are increasing. For example, audio amplifiers or computer peripheral PCI (Peripheral Component Interconnect) cards require a negative voltage to operate normally.

¢) & knowing that the negative voltage power supply can be a DC/DC converter (mainly used for power supply to automotive batteries or portable electronic devices, among them, buck-boost DC/DC converters) (buck-boost converter) is suitable for low-power applications, but when controlling the power switch, it will produce a zero point (zer〇) in the right half plane, resulting in instability of the entire system. Therefore, how to provide a negative voltage converter with simple circuit, low cost and high stability is the focus of the invention. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a buck-boost converter which is simple in circuit, high in stability, and which provides a negative voltage output. Therefore, the buck-boost converter of the present invention is configured to perform voltage conversion on an input voltage to output a negative voltage, comprising: a first diode, a power switch group, a first storage capacitor, and a second storage. Capacitor, a second one, a storage inductor and an output capacitor. The p-pole of the first diode receives the anode of the input voltage; the power switch group has a -first switch, a second switch, a third switch, and a fourth open 201101659, wherein the first switch & ^ The closed end is coupled to the p-pole of the first diode, and the other end is connected in series with the -... of the second switch, the other end of the second switch is grounded; the second opening is connected to the H (four) bungee,

The other end of the fourth switch is grounded. The first storage capacitor has a first end connected to the first pole of the first diode and a first minus sign coupled to the first joint of the first switch and the first switch The second storage capacitor has a ----------------------------------------------------------------------------------------- The second end; the second end of the fth, the drain is grounded, the energy storage inductor has a surface: the first end of the pole of the pole body and the first one of the first energy storage electric* output capacitor has one side connected to (4) The first end of the second end of the sense and the second end of the ground. When the first switch and the third switch are non-conducting (four) capacitor pair (four) inductance and output capacitance == the switch is conducting and the second switch and the fourth switch are non-two: : u b electric valley to the second storage capacitor discharge And can output the negative voltage. % inductance and wheel-out capacitance release power m2: the capacitance error of the capacitance and the output voltage of the buck-boost converter = 1 = proportional to the cycle and the energy error between the storage capacitor and the energy storage The switching frequency of the transmission switch group is inversely proportional. The square of the voltage and power voltage is proportional, and the switching frequency of the power switch group is preferably 'the sense of the sense of the energy storage inductance is inversely proportional to the negative /, the minimum output power of the buck-boost converter, and the duty cycle of the first switch. 201101659 Preferably, the capacitance of the output capacitor is proportional to the minimum output power of the buck-boost converter and inversely proportional to the voltage of the negative voltage and the negative voltage. Lower Cost Control Module In addition, another object of the present invention is to provide a control circuit module of the present invention which is simple in circuit and suitable for use with a DC/DC converter (dc/dc (3) nverter). The converter has a power switch, and the control module comprises: a comparator and a proportional integral derivative controller. The comparator is used to convert the voltage of the DC/DC converter to a reference voltage

Pressing to compare 'and output-digit logic signal; proportional integral derivative controller, according to the digital logic signal to generate a control signal for controlling the power switch to open and close 0. Preferably, the control module further comprises a coupling to the DC/DC converter A voltage divider between the output terminal and the comparator is used to divide the voltage at the output voltage according to a voltage division ratio. Preferably, the control module further includes a gate driver coupled between the proportional integral derivative controller and the power switch of the DC/DC converter for converting the control §fl into a driving signal sufficient to drive the power switch. . Further, another object of the present invention is to provide a buck-boost conversion device which is simple in circuit, low in cost, high in stability, and which provides a negative voltage output. The buck-boost conversion device of the present invention comprises: a buck-boost converter and a control module. Wherein the buck-boost converter comprises: a first diode, a power switch group, a first storage capacitor 'a second storage capacitor, a second diode, a storage inductor and an output capacitor. 201101659 and the P pole of the right t diode receives the anode of the input electric grinder; the power switch group is closed, the basin switch - the second switch, the third switch and the - fourth open ', and the first end of the first switch is coupled Connected to the P pole of the first diode, and the end of the second switch is connected in series, the other end of the second switch is grounded; the end face is connected to the first diode, and the other end is connected to the fourth The -end string # of the switch, the other end of the fourth switch is grounded. * The first storage moon valley has a first end connected to the N pole of the first diode and a second end connected to the tandem of the first switch and the second switch; - the six poles connected to the third switch and the fourth switch (four) and the second end 'the second pole of the second diode is connected to the second fault energy second first ''N pole grounded; The energy storage inductor has a first end coupled to the second end and a second end; the output capacitor has a first end that is coupled to the first end of the v: and a grounded second end. Off A 1 first switch and third switch are non-conducting and second switch and fourth open, when the input voltage is used to store the first storage capacitor, and the second == for the storage inductor and the output capacitor When the first switch and the second switch are turned on and the second switch and the fourth switch are non-conductive, the first storage of the second storage capacitor discharges the energy, and the energy storage inductor can turn the negative power I. Preferably, the output power of the capacitance filter of the second storage capacitor is proportional to the duty cycle of the first switch, and the energy error, the input voltage, and the input voltage of the virtual storage capacitor between the energy storage and the release energy are The switching frequency of the negative voltage and power switch group is inversely proportional. Preferably, the sensed value of the energy storage inductor is proportional to the square of the negative voltage, and inversely proportional to the minimum output power of the buck-boost converter, the switching frequency of the power switch group 4 201101659, and the duty cycle of the first switch. Preferably, the capacitance of the wheel-out capacitor is proportional to the minimum output power of the buck-boost converter and inversely proportional to the voltage of the negative voltage and the negative voltage. Further, the internal structure of the control module may include a voltage divider, a comparator, a proportional integral derivative controller, and a two-gate driver as the control module. The effect of the present invention is that it is possible to provide a negative voltage source which is simple in circuit, low in cost and which does not control the zero point of the right half plane. The above and other technical contents, features, and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments. Referring to FIG. 1 is a preferred embodiment of the buck-boost conversion device of the present invention, the buck-boost conversion device 100 is configured to perform voltage conversion on an input voltage to output a negative voltage 匕' including a buck-boost converter (Buck_Boost Converter) ) and a control module 2. The buck-boost converter 1 includes a first diode, a second diode A2, a first energy storage valley, a second energy storage capacitor, a storage inductor, and an output capacitor c. ; and a power switch group 丨丄. The power switch group 11 has a first switch S1, a second switch S2, a third switch S3, and a fourth switch S4. The one end 101 of the first switch S1 is coupled to the first pole of the first diode £61, and the other end 1〇2 is connected to the one end 117 of the second switch S2. The second switch S2 The other end 118 is grounded; one end 1〇5 of the third switch S3 is coupled to the first diode of the N pole 201101659 104, the other end 106 and the fourth switch s are connected to the other end 120 of the fourth switch S4. In series, the first capacitor is connected to the third switch S3. 110; a first end 109 of the point 1 〇 6 (119) of the second diode β and a second end end Π. And:: Γ 11 pure to the second storage capacitor (four) diode ... heart 12; the fitness inductor 4 has - coupled to the second cavity u has two first end 113 and a second end 114; output power = The first end 115 of the second end 114 of the inductor 4 and the first end 116, wherein the output of the electrical buck converter 输出 is output. . The first end 115 is a step up, and the operation of each element in the step-up and step-down converter 1 will be described in detail to output a negative voltage, and in the present embodiment, the step-up and step-down converter 1 operates in a continuous conduction mode (C_i_S Conduction Mede) The buck-boost converter j will have two modes of operation, which will be described separately below. Of course, the buck-boost converter 1 can also operate in a discontinuous conduction mode (DCM) or a Boundary Conduction Mode (BCM), and is not limited to the continuous conduction mode. Referring to FIG. 2, when the buck-boost converter is in the first operation mode: the first switch S1 and the third switch S3 are open (open / 〇 ff), the second switch "with the fourth switch S4 is closed (close / on ), the input voltage v starts to charge the first energy storage 201101659 capacitor g (storage energy), Bu, beat ~ At this time, the voltage of the p-pole 103 of the first diode % is higher than the voltage of the N pole 1 〇 4 The second storage capacitor C62 stores energy for storing the inductor 4 and the output capacitor c. The second diode is lower than its 112 The voltage is cut off. It is worth mentioning that in the first operation mode τ, the cross-voltage of the first-energy capacitor & will be charged to the input voltage V|.

change. In the first mode of operation, the buck-boost conversion stomach 1 has two charging channels. The first-charging circuit i is the input voltage ^ passes through the first diode-storage capacitor and the second switch S2 to the ground; The second charging circuit π is composed of a second storage capacitor & a fourth switch S4, an output capacitor & and a storage inductor I. Composed of. Two charging circuits! The charging current direction of π and π is shown by the dotted line in Figure 2, and conforms to the following equation (1): T di Γ~Ά

L0 ~ 'Ζ62 = ihA (l) where 纟 is the current output by the input voltage, L is the current through the energy storage inductor 4, and 仏 is the current flowing through the first storage capacitor ,, flowing through the second storage The current 'V,. of the energy capacitor cw is the crossover voltage 'V of the first storage capacitor Cm and the second storage capacitor core. To boost the output voltage of the converter 1, Λ. It is a load (not shown) that is connected across the output capacitor ca. Referring to FIG. 3, when the buck-boost converter 1 is in the second operation mode, the first switch S1 and the third switch S3 are closed (close/on), and the second switch S2 and the fourth switch S4 are open (open/off). The first storage capacitor & begins to discharge the first 201101659 storage capacitor G (release i), so that the crossover voltage of the second storage capacitor & will be charged to 2 times the wheeling lightning voltage'. Further, the first diode % is turned off because the voltage of the N pole 104 is higher than the voltage of the p-type 103, and the voltage of the drain 111 of the second diode β is higher than the voltage of the direct diode 112. Output capacitor ς and energy storage inductor I. Then, discharge is performed by the conduction of the first -th body - one body Z) i2, and a negative voltage ^; rim is generated. Withered ~. The value is that in the first mode of operation, the inductor current L is stored in the direction of the reverse-time oblique pin. Since the instantaneous current direction of the energy storage inductor 1 is constant, + ° therefore 'in the power switch After the group 11 is switched, the inductor current 1_° will still discharge through the second diode Α2 in the counterclockwise direction, as shown by the dashed direction in FIG.

In the second mode of operation, the buck-boost converter ι has two discharge circuits: the first discharge circuit 111 4 inputs a voltage V, passes through the first-on-sb first storage capacitor Q, and the third switch S3, The second storage capacitor c, the second diode D*2 to the ground, and the second discharge loop IV A are the output capacitor and the storage inductor. And the second polar body £) w to the ground, the two discharges of Reddy also the circuit discharge direction of 111 and 1V

L is shown in the figure = dotted line and conforms to the following equation (2): ~Vo

R zio dt - h=~hi = ib2 (2) - Body, the lift truck converter of this embodiment! In the first mode of operation, 'the output capacitor C and the energy storage inductor 4 are charged by the energy stored by the second benzing capacitor Cw; in the second mode of operation, the output capacitor c is charged and the wheel is electrically charged. Through the switching of the power switch group η, the negative voltage of the buck-boost converter i can be adjusted. The relationship between the input voltage and the output voltage r of the 201101659 input voltage will be in accordance with the following equation (3):

Vi (3) where is the duty cycle of the first-switch S1 (four) handsome due to the second switch S3 and the first pj. S1 is synchronized, and the second switch S2 and the fourth switch are opposite to the operation of the first switch S1, that is, the first __off 81 is turned on. #Switch S2 and the fourth switch S4 are turned off. 'The first switch S1 is turned off Ο

G = switch S2 and fourth switch S4 are open, so equation (3) is represented only by the duty cycle of the first switch S1. In the embodiment, the input voltage K of the 彳 step-down converter 1GG can be in the range of 10 to 16 volts, and the read/β can be converted by the buck-boost converter 1 to obtain an output. It is -12 volts. For the stupid special 'buck-boost converter i is the second to less than 12 volts volts, the well drop is the boost conversion, the right input voltage K is greater than 12 hoppers buck-boost converter 1 is the buck conversion. Further, in the present embodiment, the specifications of the step-up and step-down converter 1 are as follows: (1) The input voltage β is 10 to 16 V; (2) The output voltage Κ is 12 ν (absolute value); (3) The output power is 6 _ ^ 24W; (4) The switching frequency of the power switch group U is 195 kHz; (5) The buck-boost converter operates at a minimum output power 连续πώ of 3.6 W in continuous conduction mode; and (6) maximum peak-to-peak (peak_tG_peak) output voltage [ The continuous wave (kiss) ^ electric repeatedly Λ ν. is 60mv. (The above unit v: volt, w: watt) c and two with the above specifications, for the energy storage inductor 4, the second museum energy capacitor and output capacitor c. In this embodiment, the second storage capacitor (4) 201101659 Q will meet the equation (4): C*2 = —^~r〇ted ' D 2'eV〇-Vrfs worthwhile The second setting: The storage Hb electric valley will pay the following three points (1) The capacitance of the first storage capacitor Cm is the same as the capacity of the second storage capacitor q; (^) In the first operation mode, The second storage capacitor & maintains a 2x input power | γ, ie; (iii) the second storage capacitor & the energy ❶ error ε between charge and discharge is 0.1%. , bringing in the values of all the specifications and setting the input voltage 10 to 10 volts, the duty cycle of the first switch S1 is 6〇%, and the second storage capacitor is 307pF. In other words, the second storage capacitor & The value of ; is only greater than 307 leaves, and this embodiment is designed to be 47〇卟' but not limited to this. Moreover, 'storage inductance I. and output capacitance C are respectively in accordance with the following equation (5) and (6): ij L K2-(iP) ° 2-Ρ^.χ (5) 〇_ >〇·Δν0 (6) Similarly, the value of all the specifications can be obtained, and the hard inductor and output capacitor can be obtained. The minimum values of G are 41·5 μΗ and 650 μΡ, respectively. This embodiment is designed to be 45 μΗ and 850 μF, respectively. 12 201101659 Referring again to FIG. 1 'The control module 2 of the present embodiment includes a voltage divider 21 and a Comparator 22, a Proportional Integral Deruvative (PID) controller 23 and a gate driver 24. The voltage divider 21 is connected to the output of the buck-boost converter 1 (ie, the output) a first end of the capacitor C. for receiving the output voltage g, and according to one The voltage divider divides it. In addition, in order to make the logic circuit operate normally, the voltage divider 21 converts the output voltage r into a positive voltage output. The comparator 22 is coupled to the ❹ voltage divider 21 for receiving the voltage divider. The output voltage of the device 21 is compared with a reference voltage to output a digital logic signal, that is, a data stream composed of a logical volume and a logical volume; the proportional integral derivative controller 23 is coupled to the comparator 22 for The control signal is output according to the digital logic signal to determine the switching of the power switch group 11; the two gate drivers 24 are all connected to the proportional integral derivative controller 23 for converting the control signal into enough to drive the power switch group 11 A drive signal that opens and closes from switch S1 to switch S4. In other words, the voltage divider 21 receives the output voltage of the buck-boost converter i, which is compared by the comparator 22 and then sent to the proportional-integral-derivative controller 23, which generates the next cycle based on the output voltage K. The duty cycle of the first switch S1 to the fourth switch S4 is to maintain the output electric radiation to -12 volts. Specifically, the comparator 21 of the present embodiment utilizes the output voltage F. Multiple comparisons with the reference voltage to generate a serial control signal (ie, data stream) instead of an analog digital converter (Anai〇g, called (10)

Converter, ADC) ° In the present embodiment, 'Proportional Integral Derivative Control (4) 23 is applied to the field effect 13 201101659 Field Programmable Gate Array (FPGA), and the parameter values in the proportional integral derivative controller 23 <&&; They are 1, 〇 25 and 2, respectively, but the above are not limited to the examples. Referring to FIG. 4, the waveforms of the output voltage 匕, the inductor current 4 and the driving signal of the buck-boost conversion device 1 ,, wherein the horizontal axis is time (1 〇 _ 5 sec), the input voltage 6 is 10 volts, and the load is The current is i ampere, u is the drive signal of the first switch S1, L2 is the output voltage c, and L3 is the inductor current & As can be seen from Figure 4, the output voltage p; will maintain a voltage of 12 volts, and the inductor current ^ will vary between 1.134 and 1.135 amps. Further, the output voltage g is expressed as a positive voltage (absolute value). Referring to Fig. 5, the waveforms of the output voltage & inductor current and drive signal of the buck-boost converter 1〇〇 are the same as the same figure, and the different load currents are 2 amps. Similarly, the output voltage plant will maintain a voltage of volts, and the inductor current t will vary between 2.138 and 2139 amps. Referring to Fig. 6, the waveforms of the voltage r, the inductance, and the driving signal of the buck-boost conversion device 100 are the same as those of the input voltage of 6 volts. Similarly, the output power (4) maintains a voltage of η volts, and the inductor voltage changes between 1 〇 48 〜 1 〇 52 amps. Referring to Fig. 7, the waveform diagrams of the output voltage factory, the inductor circuit and the driving signal of the buck-boost converter 100 are the same as those of Fig. 4, except that the input voltage is ο 16 volts and the load current is 2 amps. Similarly, the output meter. Will maintain a voltage of 12 volts, and the inductance will change between 14 201101659 2.072~2.075 amps. As can be seen from FIG. 4 to FIG. 7 , the squadron buck-boost conversion device 1 适当 appropriately switches the first switch S1 to the fourth switch S4 in the power tool half-switch group through the control of the control module 2, so that the output voltage is “ Maintaining a fixed 12 volt (negative) electric waste wheel' drive the first switch S1钊笙m to the fourth switch S4 to open and close the amplitude of the drive signal is 10 volts. In addition, the park Z ^ In addition, FIG. 4 to FIG. 7 are simulation results generated by using the simulation software MATLAB. Ο Ο In summary, the lifting and lowering device (10) of the present invention generates a fixed by the cooperation of the lifting and lowering converter and the control module 2. The negative voltage output, and the control is difficult to replace the 11 to replace the analog digital conversion H, not only the circuit is simple and the cost is low. Moreover, the (4) amount 2 of the present invention does not generate six main sub-workers for the buck-boost conversion device 100. The zero point of the right + plane is also relatively stable in control. The above is a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto. Dafan according to the invention application: profit range BRIEF DESCRIPTION OF THE DRAWINGS The simple equivalent changes and modifications made by the present invention are still within the scope of the present invention. [FIG. 1] A circuit diagram illustrating an embodiment of the buck-boost conversion device of the present invention; A schematic diagram illustrating two charging circuits of a buck-boost converter in a first operating mode; Figure 3 is a schematic diagram showing two discharging circuits of a buck-boost converter in a second operation; eight 15 201101659 Figure 4 is a The waveform diagram illustrates the output voltage ρ of the buck-boost conversion device, the inductor current ί, and the simulation result of the driving signal, wherein the input voltage γ is 1 volt and the load current is 1 amp; FIG. 5 is a waveform diagram illustrating the lifting and lowering The output voltage of the voltage conversion device 、, the inductor current ζ·. and the simulation result of the driving signal, wherein the input voltage ^ is 1 volt, the load current is 2 amps; FIG. 6 is a waveform diagram illustrating the buck-boost conversion device Output voltage F., inductor current (and the simulation result of the drive signal, where the input voltage is d 16 volts, the load current is 1 amp; and Figure 7 is a waveform diagram, The output voltage 匕, the inductor current of the buck-boost converter, and the simulation result of the drive signal, where the input voltage is 〇16 volts and the load current is 2 amps. 16 201101659 [Key component symbol description] 100 ••... •• Buck-Boost Switching Device 111 ···_ •••P pole (second diode) 1 ........ •• buck-boost converter 112 ···· -••N pole (second two Polar body 101.·····•• The knowledge of the switch 113 ····...the first end (storage inductance) 102 ••the other 114 of the first switch ····...the second end (energy storage) Inductor) Terminal 115 ···· ... Terminal (Output Capacitor) 103 ·.... ••P pole (first diode) 116 ···_ ...2nd terminal (output capacitor) 104 ••N pole (First Diode) 117 ···· ...One end of the second switch 105 ····.••弟__Switch knowledge” 118 ..··...the other 106 of the second switch ··.. ••Splicing point 119 of the third switch and the fourth end switch ····...107 of the fourth switch ·····••The first end (the first energy storage 120 ····...the fourth switch of a capacitor) terminal 108 ···.··-the second end (first energy storage 2 .... ... control device capacitance) 21 ... ... voltage divider 109 • • first end (second storage Can 22...... ... Comparator Capacitor) 23... ...Proportional Integral Differential Control 11........• Power Switch Controller 110 ····· •• Second End (Second Energy Storage 24... ... gate driver capacitor) 17

Claims (1)

201101659 VII. Patent application scope: 1. A buck-boost converter for voltage conversion of an input voltage to output a negative voltage. The buck-boost converter comprises: a first one-pole body whose P-pole receives the input An anode of the voltage; a power switch group having a first switch, a second switch, a third switch, and a fourth switch, wherein one end of the first switch is coupled to the P pole of the first diode, and The other end is connected in series with the second end of the second switch, the other end of the second switch is grounded, the end of the third switch is coupled to the N pole of the first diode, and the other end is connected to the fourth switch One end of the fourth switch is connected to the other end of the fourth switch; a first storage capacitor has a first end coupled to the N pole of the first diode and a first switch coupled to the first switch a second end of the second switch; the second storage capacitor has a first end and a second end coupled to the series of the switch and the fourth switch; The body '丨P pole is coupled to the second energy storage end, and the N pole is grounded; Leyi storage energy Having a first end and a second end coupled to the second diode; and the output capacitor of the pole has a first end that is lightly connected to the hard inductor and a second end that is grounded, When the first switch and the third switch are non-conductive and the fourth switch is conductive, the input voltage is applicable to the first material (four), and the second energy storage capacitor is capable of The output;: 18 201101659 Guan M visits the six kiss spears two switches to be turned on and the first _ Μ off and the fourth switch are non-conducting Α 开 - open the storage capacitor discharge energy, and the cast energy inductor: the first storage capacitor Second, the negative power; ^:. Xuan output capacitor discharge and turn out 2.=Applicable to the patent range 〗 〖The lift (10) converter: the capacitance value of the capacitor is proportional to the duty cycle of the second switch of the lift converter. And the energy generated between the energy supply and the energy release can be inversely proportional to the error of the amount, the input voltage, and the switching frequency of the power switch group. 1 3: According to the patent application scope In the liter (four) converter described in the item, the sense value of the faulty inductor is proportional to the negative (four) square, and the minimum output power of the down converter, the switching frequency of the power switch group, and the first switch The duty cycle is inversely proportional. 4. According to the patent of the patent _1, the lifting a conversion H, wherein the capacitance of the output capacitor is proportional to the minimum output power of the buck-boost converter, and the negative voltage and The negative voltage of the negative voltage is inversely proportional. 5. A control module suitable for use with a DC/DC converter having at least one power switch, the control module comprising: a comparator , compare the DC/DC conversion The output voltage of the device and a reference voltage 'rounds a digital logic signal; and a proportional integral derivative controller generates a control signal for controlling the opening and closing of the power switch according to the digital logic signal. 6. According to the patent application scope 5 The control module described in the item further includes a side 19 201101659 connected between the output terminal of the straight/DC converter and the comparator: the device divides the voltage of the output according to a voltage division ratio The control module according to the fifth or sixth aspect of the Shenjing patent scope further includes a gate driver connected between the proportional integral derivative controller and the power rate switch of the DC/DC converter. The driving signal is converted into a driving signal sufficient to drive the power switch. 8. A buck-boost conversion device comprising: a buck-boost converter comprising a first pole body, the anode of which receives an input voltage anode, - The power switch group 'has a first switch, a second switch, and a fourth switch. The end of the first switch is connected to: the p-pole of the first-pole body, and the other end First The end of the switch is connected in series, the other end of the second switch is grounded to the switch, connected to the first diode, and the other is: ground, and the other is connected to the fourth switch. The energy storage capacitor has a potential body end coupled to the N pole of the first diode and a second end coupled to the series connection of the first switch and the second gate The diode of the second diode is lightly connected to the second storage capacitor-second storage capacitor, and has a first end and a second end connected to the serial connection of the third four switch. The second end of 201101659, its drain is grounded, a storage inductor has the first end and the second end of the pole, and the ρ wheel discharge capacitance of the first pole, with the right - the HbV end The flute # has a first end coupled to the second port of the energy storage inductor and a grounded second end, the first switch and the third switch being non-conducting and the fourth switch being conductive The input voltage is the second energy' and the second energy storage capacitor is the storage inductor 尨邋, the “a” β-diode switch and the third switch: “two switches and When the fourth switch is non-conducting, continued: - the storage capacitor discharges the second storage capacitor, and the fitness inductor and the output capacitor discharge the negative voltage; and: the control module, according to The negative voltage corresponds to controlling the switching of the power group. 9. The buck-boost conversion device of claim 8, wherein the capacitance of the second storage capacitor is proportional to the output power of the buck-boost converter and the duty cycle of the first switch, and The energy error generated between the energy storage and the energy release of the storage capacitor, the wheel-in voltage, the negative voltage, and the switching frequency of the power switch group are inversely proportional. 10' The buck-boost conversion device of claim 8, wherein the sense of the stored energy inductance is proportional to the square of the negative voltage, and the minimum output power of the boost converter, the power switch The switching frequency of the group is inversely proportional to the duty cycle of the first switch. According to the buck-boost conversion device of claim 8, in the method of 20112011659, the capacitance of the output capacitor is proportional to the buck-boost, the power, and the ratio of the negative and the D is small. The electric sign and the continuous wave of the negative electric meter...the 12th according to the lifting and lowering order mentioned in the scope of claim 8 of the patent application, the control module comprises a comparator and a skirt, and the comparator compares the round The voltage of the capacitor is matched with a parameter;:: control outputs a digital logic signal, section, test voltage, and. The Kodak 疵 The proportional integral derivative controller bit logic signal generates a control signal for controlling the switching of the power ^ ^ οχ Μ 丰 switch group. 13. The liter (four) conversion device according to claim 4, wherein the fourth embodiment further comprises: (4) connected between the lifting dust converter and the comparator, for transmitting the lifting a converter according to the n ratio. Partial pressure. The electric vertical 14. The buck-boost switching device according to claim 12 of the patent scope is also connected to the gate driver of the proportional integral derivative controller and the power switch The control signal is converted into a drive signal sufficient to drive the switching of the power switch group. twenty two