CN-122001217-A - Average current mode buck-boost converter with high transient response performance

CN122001217ACN 122001217 ACN122001217 ACN 122001217ACN-122001217-A

Abstract

The invention discloses an average current mode buck-boost converter with high transient response performance, which is characterized in that a main circuit adopts a four-switch voltage transformation topology to supply power to a load by a voltage source, a current sampling circuit detects inductance current to form a sampling current signal, a feedback loop generates error voltage according to the difference value between output voltage and reference voltage and compares the error voltage with the sampling current, a control signal module generates a driving signal to control a switching tube based on a comparison result, an average current mode is adopted to expand the range of input and output voltage and optimize the sequence of the switching tube, input voltage feedforward and load current feedforward are introduced, the input voltage is subjected to high-pass filtering and then is subjected to weighted summation with the inductance current sampling signal to obtain a current sampling total signal, the load current is subjected to voltage conversion and then is subjected to weighted summation with a voltage loop output signal to obtain a voltage loop output total signal, and the two paths of signals are transmitted to a current loop together to generate a current loop output signal and are compared with a slope signal to generate four-switch control signals, so that efficient and stable buck energy conversion is realized.

Inventors

FANG ZHONGYUAN
LI XUANYE
Fan Wangchen
Tian Zekai
XIONG ZHIWEI
SUN WEIFENG

Assignees

东南大学

Dates

Publication Date: 20260508
Application Date: 20251224

Claims (9)

1. The average current mode buck-boost converter with high transient response performance is characterized by comprising a four-switch Guan Shengjiang power supply circuit and a switch tube control circuit, wherein the four-switch Guan Shengjiang power supply circuit comprises four switch tubes which respectively form an input side half bridge arm and an output side half bridge arm, the two are connected through an inductor, the switch tube control circuit collects the inductor current between the input side half bridge arm and the output side half bridge arm in the four-switch Guan Shengjiang power supply circuit and samples the output voltage, and a VCA_boost signal and a VCA_buck signal are generated through signal compensation, and then according to a preset sawtooth wave signal The duty ratio signals D1 and D2 are generated respectively and converted into control signals corresponding to four switching tubes in the four-switch Guan Shengjiang voltage power supply circuit respectively, and the control signals are input to corresponding switching tubes in the four-switch Guan Shengjiang voltage power supply circuit respectively to control the four-switch Guan Shengjiang voltage power supply circuit to realize switching among modes.
2. The high transient response performance average current mode buck-boost converter of claim 1, wherein said four switch Guan Shengjiang power supply circuit includes a voltage source V1, a first capacitor C1, a second capacitor C2, a load resistor RL, a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, a fourth switching tube Q4, and an inductor L; Wherein the positive electrode of the voltage source V1 is connected with one end of the first capacitor C1 and the drain electrode of the first switching tube Q1, the other end of the first capacitor C1 is connected with one end of the equivalent electric group ESR1, the source electrode of the switching tube Q1 is connected with the drain electrode of the second switching tube Q2 and one end of the inductor L, the other end of the inductor L is connected with the source electrode of the fourth switching tube Q4 and the drain electrode of the third switching tube Q3, the first switching tube Q1 and the second switching tube Q2 form an input side half bridge arm, the third switching tube Q3 and the fourth switching tube Q4 form an output side half bridge arm, and the current flowing through the inductor L is the inductive current The drain electrode of the fourth switching tube Q4 is connected with one end of the second capacitor C2 and one end of the load resistor RL in a butt joint mode, the other end of the second capacitor C2 is connected with one end of the equivalent electric group ESR2 in series, the negative electrode of the voltage source V1, the other end of the equivalent resistor ESR1, the source electrode of the second switching tube Q2, the source electrode of the third switching tube Q3, the other end of the equivalent resistor ESR2 and the other end of the load resistor RL are connected with the ground, two ends of the load resistor RL form an output end of a four-switch Guan Shengjiang power supply circuit, sampling output voltage is from an output end of the four-switch Guan Shengjiang power supply circuit, and the grid electrode of the first switching tube Q1, the grid electrode of the second switching tube Q2, the grid electrode of the third switching tube Q3 and the grid electrode of the fourth switching tube Q4 respectively form control ends of the switching tubes.
3. The high transient response performance average current mode buck-boost converter of claim 2, wherein the four-switch Guan Shengjiang power supply circuit further comprises a first resistor R1 and a second resistor R2, the first resistor R1 and the second resistor R2 are connected in series with each other and then connected between the positive electrode and the negative electrode of the output end of the four-switch Guan Shengjiang power supply circuit, the sampled output voltage is taken from the voltage between the connection position between the first resistor R1 and the second resistor R2 and the negative electrode of the output end of the four-switch Guan Shengjiang power supply circuit, one end of the first resistor R1 is connected with one end of the load resistor RL, one end of the second resistor R2 is connected with the other end of the load resistor RL, and the first resistor R1 is connected with the other end of the second resistor R2.
4. The high transient response performance average current mode buck-boost converter of claim 3, wherein said switching tube control circuit includes a current sampling circuit, a first high gain high bandwidth op-amp EA1, a second high gain high bandwidth op-amp EA2, an summing module, a first comparator CMP1, a second comparator CMP2, a control signal generation circuit; wherein the negative phase input end of the first high-gain high-bandwidth operational amplifier EA1 is connected to the sampling output voltage of the four-switch Guan Shengjiang power supply circuit The non-inverting input end of the first high-gain high-bandwidth operational amplifier EA1 is accessed to a preset first reference voltage The output end of the first high-gain high-bandwidth operational amplifier EA1 is connected with the non-inverting input end of the second high-gain high-bandwidth operational amplifier EA2 in a butt joint manner, and the first high-gain high-bandwidth operational amplifier EA1 is used for presetting a first reference voltage For sampling output voltage Performing signal compensation to generate corresponding signals And outputs to the non-inverting input end of the second high-gain high-bandwidth operational amplifier EA 2; the input end of the current sampling circuit is connected to inductive current between an input side half bridge arm and an output side half bridge arm in the four-switch Guan Shengjiang power supply circuit The output end of the current sampling circuit is connected with the negative phase input end of the second high-gain high-bandwidth operational amplifier EA2 in a butt joint mode, and the current sampling circuit aims at the connected inductance current Performing scaling bias processing to obtain voltage signal Signal the voltage Output to the negative phase input end of the second high-gain high-bandwidth operational amplifier EA2, and the second high-gain high-bandwidth operational amplifier EA2 is used for outputting a signal according to the signal For voltage signal Performing signal compensation, generating and outputting a VCA_boost signal; The output end of the second high-gain high-bandwidth operational amplifier EA2 is respectively connected with the normal phase input end of the first comparator CMP1 and one input end of the adding module in a butt joint way, and the VCA_boost signal output by the second high-gain high-bandwidth operational amplifier EA2 is respectively output to the first comparator CMP1 and the adding module, and the other input end of the adding module is connected with a preset second reference voltage The output end of the adding module is connected with the negative phase input end of the second comparator CMP2 in a butt joint way, and the adding module aims at the VCA_boost signal and the preset second reference voltage Performing superposition to generate a VCA_buck signal and outputting the VCA_buck signal to a second comparator CMP2; The negative phase input end of the first comparator CMP1 and the positive phase input end of the second comparator CMP2 are respectively connected with a preset sawtooth wave signal The output end of the first comparator CMP1 is respectively connected with the input end of the control signal generating circuit in a butt joint way with the output end of the second comparator CMP2, and the first comparator CMP1 aims at the VCA_boost signal and the preset sawtooth wave signal Comparing the signal with a preset sawtooth signal to generate a duty ratio signal D1, outputting the duty ratio signal D1 to a control signal generating circuit, and comparing the VCA_buck signal with the preset sawtooth signal by a second comparator CMP2 Comparing the signals to generate a duty ratio signal D2 and outputting the duty ratio signal D2 to a control signal generating circuit; the control signal generating circuit converts the duty ratio signals D1 and D2 into control signals respectively corresponding to the four switching tubes in the four-switch Guan Shengjiang voltage power supply circuit, and is used for respectively controlling each switching tube in the four-switch Guan Shengjiang voltage power supply circuit, so that the four-switch Guan Shengjiang voltage power supply circuit can be switched between modes.
5. The high transient response performance average current mode buck-boost converter of claim 4, wherein said switching tube control circuit further includes a transient response enhancement module for which said four switch Guan Shengjiang power supply circuit inputs side voltages After passing through a high pass filter and The signals are subjected to weighted summation and are input to the negative phase input end of a second high-gain high-bandwidth operational amplifier EA 2; Load current Is converted into a voltage signal after being sampled and is connected with The signals are subjected to weighted summation and are input to a non-inverting input end of a second high-gain high-bandwidth operational amplifier EA 2; Generating a VCA_boost signal by using a second high-gain high-bandwidth operational amplifier EA2 through signal compensation, and superposing a preset second reference voltage Generating a vca_buck signal.
6. The high transient response performance average current mode buck-boost converter of claim 4, wherein said switching tube control circuit further includes a dead time and control circuit, the number of dead time and control circuit inputs corresponding to the number of control signal generating circuit outputs, the number of dead time and control circuit outputs corresponding to the number of switching tubes; The dead time and control circuit comprises a delay module and a driving module, wherein each input end of the delay module forms each input end of the dead time and control circuit, each output end of the delay module forms each input end of the driving module, and each output end of the driving module forms each output end of the dead time and control circuit; The control signal generating circuit outputs control signals corresponding to the four switching tubes to the dead time and control circuit, the dead time and control circuit firstly carries out delay processing update on the control signals by the delay module and outputs the control signals to the driving module, the control signal generating circuit is used for adding the dead time between all modes in the working period of the four-switch Guan Shengjiang piezoelectric power supply circuit to prevent the high switching tube and the low switching tube from being simultaneously conducted, and then the driving module respectively converts the control signals into corresponding driving signals and respectively outputs the driving signals to all the switches in the four-switch Guan Shengjiang piezoelectric power supply circuit to drive so as to realize the switching of the four-switch Guan Shengjiang piezoelectric power supply circuit among all the modes.
7. The high transient response performance average current mode buck-boost converter of claim 4, wherein said current sampling circuit comprises a current sampling module, a scaling module, and a biasing module connected in series in sequence from an input to an output, wherein the input of the current sampling module forms the input of the current sampling circuit, the output of the biasing module forms the output of the current sampling circuit, and the input of the current sampling circuit is used for collecting and accessing the inductive current between the input side half bridge arm and the output side half bridge arm in the four-switch Guan Shengjiang voltage supply circuit And output to a scaling module, which scales the inductor current according to a preset ratio Scaling to obtain primary voltage signal, outputting to a bias module, and performing bias processing on the primary voltage signal by the bias module by superposing preset voltage to obtain voltage signal And output.
8. An average current mode buck-boost converter according to claim 1 or 4 wherein said predetermined sawtooth signal The capacitor is generated by adopting a current source capacitor charging and discharging circuit.
9. The high transient response performance average current mode buck-boost converter of claim 1, wherein said input side voltage of said four switch Guan Shengjiang power supply circuit is referred to as Output side voltage ; When the VCA_buck signal is equal to the preset sawtooth signal Crossing, the four-switch Guan Guansheng buck power supply circuit works in buck mode, the four-switch Guan Shengjiang power supply circuit works in buck mode, and only the VCA_buck signal and the preset sawtooth signal The driving signals of the first switching tube Q1 are duty ratio signals D2, the driving signals of the second switching tube Q2 are the duty ratio signals D2 which are inverted, the driving signals of the third switching tube Q3 are all the time 0, and the driving signals of the fourth switching tube Q4 are all the time 1; When the VCA_boost signal is equal to the preset sawtooth signal Crossing, the four-switch Guan Guansheng buck power supply circuit works in boost mode, the four-switch Guan Shengjiang power supply circuit works in boost mode, and only the VCA_boost signal and the preset sawtooth wave signal The driving signals of the first switching tube Q1 are always 1, the driving signals of the second switching tube Q2 are always 0, the driving signals of the third switching tube Q3 are duty ratio signals D1, and the driving signals of the fourth switching tube Q4 are inverted with respect to the duty ratio signals D1; When the VCA_boost signal and the VCA_buck signal are both equal to the predetermined sawtooth signal Crossing, four-switch Guan Guansheng buck power circuit works in buckboost mode, and the VCA_buck signal and the VCA_boost signal are both identical to the preset sawtooth wave signal The driving signals of the first switching tube Q1 are the duty ratio signals D2, the driving signals of the second switching tube Q2 are the duty ratio signals D2 and the driving signals of the third switching tube Q3 are the duty ratio signals D1, and the driving signals of the fourth switching tube Q4 are the duty ratio signals D1 and the duty ratio signals D2 are inverted.

Description

Average current mode buck-boost converter with high transient response performance Technical Field The invention relates to the technical field of voltage transformation control, in particular to an average current mode buck-boost converter with high transient response performance. Background The four-switch buck-boost switch converter has wider voltage regulation range because of being capable of being seamlessly switched in the working modes of boost, buck, isobaric and the like, and is widely applied in the fields of industry, medical treatment, automobiles and the like. In practical use, the converter is typically required to maintain stable operation over a wide input and output voltage range and to achieve a smooth transition in the event of rapid load changes. Particularly for high-precision load occasions, the system not only requires low ripple and high stability of output voltage, but also provides higher requirements for transient response speed and regulation capacity of the converter, so that the system can be quickly restored to a steady state when voltage or load suddenly changes, and the output performance is ensured not to be disturbed. Disclosure of Invention The purpose of the invention is that: the method provides the four-tube buck-boost switching power supply control circuit which can optimize the mode switching process, improve the whole energy transmission efficiency, enhance the transient response and quickly respond to jump of input voltage and load current. In order to achieve the above functions, the invention designs an average current mode buck-boost converter with high transient response performance, which comprises a four-switch Guan Shengjiang power supply circuit and a switch tube control circuit, wherein the four-switch Guan Shengjiang power supply circuit comprises four switch tubes which respectively form an input side half bridge arm and an output side half bridge arm, the two are connected through an inductor, the switch tube control circuit collects the inductor current between the input side half bridge arm and the output side half bridge arm in the four-switch Guan Shengjiang power supply circuit and samples the output voltage, and a VCA_boost signal and a VCA_buck signal are generated through signal compensation, and then the voltage is controlled according to a preset sawtooth wave signalThe duty ratio signals D1 and D2 are generated respectively and converted into control signals corresponding to four switching tubes in the four-switch Guan Shengjiang voltage power supply circuit respectively, and the control signals are input to corresponding switching tubes in the four-switch Guan Shengjiang voltage power supply circuit respectively to control the four-switch Guan Shengjiang voltage power supply circuit to realize switching among modes. The preferable technical scheme of the invention is that the four-switch Guan Shengjiang power supply circuit comprises a voltage source V1, a first capacitor C1, a second capacitor C2, a load resistor RL, a first switch tube Q1, a second switch tube Q2, a third switch tube Q3, a fourth switch tube Q4 and an inductor L; Wherein the positive electrode of the voltage source V1 is connected with one end of the first capacitor C1 and the drain electrode of the first switching tube Q1, the other end of the first capacitor C1 is connected with one end of the equivalent electric group ESR1, the source electrode of the switching tube Q1 is connected with the drain electrode of the second switching tube Q2 and one end of the inductor L, the other end of the inductor L is connected with the source electrode of the fourth switching tube Q4 and the drain electrode of the third switching tube Q3, the first switching tube Q1 and the second switching tube Q2 form an input side half bridge arm, the third switching tube Q3 and the fourth switching tube Q4 form an output side half bridge arm, and the current flowing through the inductor L is the inductive current The drain electrode of the fourth switching tube Q4 is connected with one end of the second capacitor C2 and one end of the load resistor RL in a butt joint mode, the other end of the second capacitor C2 is connected with one end of the equivalent electric group ESR2 in series, the negative electrode of the voltage source V1, the other end of the equivalent resistor ESR1, the source electrode of the second switching tube Q2, the source electrode of the third switching tube Q3, the other end of the equivalent resistor ESR2 and the other end of the load resistor RL are connected with the ground, two ends of the load resistor RL form an output end of a four-switch Guan Shengjiang power supply circuit, sampling output voltage is from an output end of the four-switch Guan Shengjiang power supply circuit, and the grid electrode of the first switching tube Q1, the grid electrode of the second switching tube Q2, the grid electrode of the third switching tube Q3 and the grid electrode of the four