CN116388575A - Inductance current nondestructive sampling method and circuit of four-switch buck-boost converter - Google Patents
Inductance current nondestructive sampling method and circuit of four-switch buck-boost converter Download PDFInfo
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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
- H02M3/33569—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 having several active switching elements
- H02M3/33576—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 having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
- H02M3/33569—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 having several active switching elements
- H02M3/33571—Half-bridge at primary side of an isolation transformer
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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Abstract
The invention discloses an inductance current nondestructive sampling method and circuit of a four-switch buck-boost converter, and belongs to the technical field of power generation, transformation or power distribution. The invention connects the midpoint of the front bridge arm of the four-switch buck-boost converter to the non-inverting input end of the first operational amplifier, connects the midpoint of the rear bridge arm to the non-inverting input end of the second operational amplifier, connects the inverting input ends of the two operational amplifiers to the ground through a resistor respectively, connects the outputs of the two operational amplifiers to the base electrode of a triode respectively, converts the front/rear bridge arm voltage into front/rear bridge arm current, copies the front/rear bridge arm current through a current mirror, subtracts the two copied currents to obtain capacitor charging current, and discharges the electric quantity stored in the capacitor through a switch before each switching period is finished, and calculates the inductance current by using the capacitor voltage. According to the invention, through designing the operational amplifier and the current mirror, the lossless sampling of the inductance current of the four-switch buck-boost converter is realized.
Description
Technical Field
The invention discloses an inductance current nondestructive sampling method and circuit of a four-switch buck-boost converter, relates to a direct current-direct current converter technology of an electric energy conversion device, and belongs to the technical field of power generation, transformation or power distribution.
Background
With the update of various electronic products, the direct current power supply is developed towards the technical requirements of higher efficiency, higher integration level, wide input range and the like. In the design of a four-switch buck-boost converter, how to improve efficiency is a very important problem, and reducing loss has important significance for improving the stable operation capability of a switching device, the conversion efficiency of circuit topology and the safety of working environment.
The existing inductive current sampling schemes have the following two types: firstly, a sampling resistor or a resistor transformer is arranged on a detection branch, but the resistor itself generates heat to bring loss, so that the overall efficiency is reduced; the second type is to sample by placing the equivalent resistance of the MOSFET, although the MOSFET has small resistance and little loss, the MOSFET is greatly affected by temperature and process, and the current detection precision is not high.
The invention aims to provide an inductance current nondestructive sampling method and circuit for a four-switch buck-boost converter so as to overcome the defects.
Disclosure of Invention
The invention aims to overcome the defects of the background art, and provides an inductance current nondestructive sampling method and circuit for a four-switch buck-boost converter, which are characterized in that an operational amplifier is used for converting a front bridge arm voltage and a rear bridge arm voltage into currents, a front bridge arm charging current and a rear bridge arm discharging current are copied by a current mirror and then subtracted to obtain a charging current for charging a capacitor, and before each period is finished, the stored electric quantity of the capacitor is released by a switch, so that the voltage waveform is finally simulated, the inductance current of the four-switch buck-boost converter is subjected to nondestructive sampling, and the integral efficiency of the converter is improved.
The invention adopts the following technical scheme for realizing the purposes of the invention:
a lossless sampling method for inductance current of a four-switch buck-boost converter,
sampling the front bridge arm midpoint voltage of the four-switch buck-boost converter, converting the sampled front bridge arm midpoint voltage into front bridge arm current, and performing copy operation on the front bridge arm current to obtain source current;
sampling the midpoint voltage of the rear bridge arm of the four-switch buck-boost converter, converting the sampled midpoint voltage of the rear bridge arm into rear bridge arm current, and performing copy operation on the rear bridge arm current to obtain pull-down current;
and subtracting the source current and the pull-down current to obtain a capacitor charging current, switching on a discharging branch connected with the capacitor charging branch in parallel in an inductor current holding stage of each switching period, and switching off the discharging branch at the beginning of the next switching period.
An inductor current lossless sampling circuit of a four-switch buck-boost converter, comprising: the device comprises a first voltage conversion current module, a first current mirror module, a second voltage conversion current module, a second current mirror module, a third current mirror module and a capacitor charging and releasing module.
In the first voltage conversion current module, the non-inverting input end of the first operational amplifier samples the midpoint voltage V of the front bridge arm of the four-switch buck-boost converter a The inverting input end of the first operational amplifier is connected with the emitter of the third triode and then grounded through a first resistor, the output end of the first operational amplifier is connected to the base electrode of the third triode, and the collector electrode of the third triodeThe collector of the third triode is used as the output end of the first voltage conversion current module. According to the principle of virtual short and virtual break of the operational amplifier, the two input terminals of the first operational amplifier have the same potential, and the input terminals have no current, so that the collector current of the third triode can be obtained as
R1 is the resistance value of the first resistor, the collector current of the third triode and the front bridge arm current obtained by sampling the midpoint voltage of the front bridge arm of the four-switch buck-boost converter.
The first current mirror module consists of a first triode and a second triode, wherein the emitter of the first triode is connected with the emitter of the second triode to serve as a power supply end of the first current mirror module to be connected with a power supply end of a power supply voltage, the base electrode and the collector electrode of the first triode are connected with the base electrode of the second triode to serve as an input end of the first current mirror module, and the collector electrode of the second triode serves as an output end of the first current mirror module.
In the second voltage conversion current module, the non-inverting input end of the second operational amplifier samples the midpoint voltage V of the rear bridge arm of the four-switch buck-boost converter b The inverting input end of the second operational amplifier is connected with the emitter of the sixth triode and then grounded through a second resistor, the output end of the second operational amplifier is connected to the base electrode of the sixth triode, the collector electrode of the sixth triode is connected to the collector electrode of the fourth triode, the non-inverting input end of the second operational amplifier is used as the input end of the second voltage conversion current module, and the collector electrode of the sixth triode is used as the output end of the second voltage conversion current module. According to the principle of virtual short and virtual break of the operational amplifier, the potential of the two input ends of the second operational amplifier is the same and the input ends have no current, so that the collector current of the sixth triode can be obtained as
R2 is the resistance of the second resistor.
The second current mirror module consists of a fourth triode and a fifth triode, wherein an emitter of the fourth triode is connected with an emitter of the fifth triode to serve as a power supply terminal of the second current mirror module to be connected with a power supply voltage, a base electrode and a collector electrode of the fourth triode are connected with a base electrode of the fifth triode to serve as an input end of the second current mirror module, and a collector electrode of the fifth triode serves as an output end of the second current mirror module.
The third current mirror module is composed of a seventh triode and an eighth triode, wherein the emitter of the seventh triode is connected with the emitter of the eighth triode to serve as a power supply ground of the third current mirror module, the base electrode and the collector of the seventh triode are connected with the base electrode of the eighth triode to serve as an input end of the third current mirror module, and the collector of the eighth triode serves as an output end of the third current mirror module.
The capacitor charging and releasing module comprises: the positive plate of the capacitor is used as a first input end of the capacitor and charging module, the negative plate of the capacitor is grounded, the drain electrode of the switch tube is connected with the positive plate of the capacitor, the source electrode of the switch tube and the substrate are both grounded, one input end of the AND gate is used as a second input end of the capacitor charging and releasing module to be connected with a front bridge arm down tube switching signal, the other input end of the AND gate is used as a third input end of the capacitor charging and releasing module to be connected with a rear bridge arm down tube switching signal, and the output end of the AND gate is connected with the grid electrode of the switch tube.
The front bridge arm current is copied through the first current mirror module to obtain source current, the rear bridge arm current is copied through the second current mirror module to be copied once through the third current mirror module, and the current direction is changed to obtain pull-down current.
The source current Isource minus the pull-down current Isink results in a charging current to charge the capacitor. Assuming r1=r2=r, then
Whereas for inductance L @>
The inductor current I can be represented by Vcap L 。
Before each switching period is finished, namely in an inductive current holding stage, after the switching tube receives signals that the front bridge arm lower tube switch is conducted and the rear bridge arm lower tube switch tube is conducted, the electric quantity stored in the capacitor is released, and lossless sampling of the inductive current is completed.
The invention adopts the technical scheme and has the following beneficial effects: according to the four-switch buck-boost converter inductance current lossless sampling scheme, inductance current is sampled through an external circuit, and compared with the existing method of connecting resistors or current transformers in series, extra power loss is avoided; compared with the method for connecting the MOSFET resistors in series, the method avoids detection deviation caused by temperature and process, improves current detection precision, can realize nondestructive sampling of inductance current, and improves the overall efficiency of the circuit.
Drawings
Fig. 1 is a circuit diagram of a four-pipe buck-boost converter.
Fig. 2 (a) is a block diagram of an inductor current lossless sampling circuit according to the present invention. Fig. 2 (b) is a specific circuit diagram of the inductor current lossless sampling circuit of the present invention.
Fig. 3 is a waveform diagram of the charge capacitance and inductor current when the four-transistor buck-boost converter is operating in boost mode.
Fig. 4 is a waveform diagram of the charge capacitance and inductor current when the four-transistor buck-boost converter is operating in buck mode.
The reference numerals in the figures illustrate: s is S 1 ～S 4 The first to fourth switching tubes are L, cin, co, X1, X2, R1, R2, Q1 to Q8, C1, SW1, AND AND gate, respectively.
Detailed Description
The technical scheme of the invention is described in detail below with reference to the accompanying drawings.
From the inductance formula, it is known that the inductance current transformation rate can be represented by sampling the voltage across the inductance. According to the novel current sampling scheme of the four-switch buck-boost converter, inductance voltage is converted into current through the operational amplifier and current mirror circuit, the voltage change rate is obtained according to a capacitance formula, and the subsequent control signal is obtained by combining charging time.
The circuit of the four-tube buck-boost converter is shown in fig. 1, and is composed of a first switch tube S 1 Second switch tube S 2 Third switch tube S 3 Fourth switching tube S 4 And an inductance L. First switching tube S 1 And a second switching tube S 2 An input capacitor Cin is connected between two terminals of the front bridge arm in series, and a third switch tube S 3 And a fourth switching tube S 4 An output capacitor Co is connected between two terminals of the rear bridge arm in series, an inductance L is connected between the midpoint of the front bridge arm and the midpoint of the rear bridge arm, and an input voltage source Vin is connected with a first switch tube S 1 Between the drain electrode and the primary side ground, a third switch tube S 3 The converter output port is formed with the secondary side, and the converter output port output voltage Vo is equivalent to a current source Io connected to the output port.
The inductor current nondestructive sampling circuit of the invention is shown in fig. 2 (a) and 2 (b), and comprises: the device comprises a first voltage conversion current module, a first current mirror module, a second voltage conversion current module, a second current mirror module, a third current mirror module and a capacitor charging and releasing module.
For the midpoint voltage of the front bridge arm of the four-switch buck-boost converter, the invention samples through the first voltage conversion current module, and the non-inverting input end of the first operational amplifier X1 samples the midpoint voltage V of the front bridge arm of the four-switch buck-boost converter a The inverting input end of the first operational amplifier X1 is grounded through a first resistor R1 and is connected to the emitter of a third triode Q3 (NPN triode), the output of the first operational amplifier X1 is connected to the base electrode of the third triode Q3, and the collector electrode of the third triode Q3 is connected to the collector electrode of a fourth triode Q4 and then is connected to the power supply voltage VDD. According to the principle of virtual short of the operational amplifier, the two input ends of the first operational amplifier have the same potential, and the input end of the first operational amplifier has no current due to the principle of virtual disconnection of the operational amplifier, so that the collector current of the third triode Q3 can be obtained as
R1 is the resistance of the first resistor.
The first current mirror module is composed of a first triode Q1 (PNP type triode) and a second triode Q2 (PNP type triode), wherein an emitting electrode of the first triode Q1 and an emitting electrode of the second triode Q2 are connected to serve as a power supply terminal of the first current mirror module and a power supply terminal of the first current mirror module, a base electrode and a collector electrode of the first triode Q1 are connected with a base electrode of the second triode Q2 to serve as an input end of the first current mirror module, and a collector electrode of the second triode Q2 serves as an output end of the first current mirror module.
For the midpoint voltage of the rear bridge arm of the four-switch buck-boost converter, the invention samples through the second voltage conversion current module. The non-inverting input end of the second operational amplifier X2 samples the midpoint voltage V of the rear bridge arm of the four-switch buck-boost converter b The inverting input terminal of the second operational amplifier X2 is grounded through a second resistor R2 and is connected to the emitter of a sixth triode Q6 (NPN triode), the output of the second operational amplifier X2 is connected to the base of the sixth triode Q6, and the collector of the sixth triode Q6 is connected to the collector of the fourth triode Q4. According to the principle of virtual short of the operational amplifier, the two input ends of the second operational amplifier have the same potential, and the input end of the second operational amplifier has no current due to the principle of virtual disconnection of the operational amplifier, so that the collector current of the sixth triode Q6 can be obtained as
R2 is the resistance of the second resistor.
The second current mirror module is composed of a fourth triode Q4 (PNP type triode) and a fifth triode Q5 (PNP type triode), wherein an emitter of the fourth triode Q4 is connected with an emitter of the fifth triode Q5 to serve as a power supply terminal of the second current mirror module to be connected with a power supply voltage VDD, a base electrode and a collector electrode of the fourth triode Q4 are connected with a base electrode of the fifth triode Q5 to serve as an input end of the second current mirror module, and a collector electrode of the fifth triode Q5 serves as an output end of the second current mirror module.
The third current mirror module is composed of a seventh triode Q7 (NPN triode) and an eighth triode Q8 (NPN triode), wherein an emitter of the seventh triode Q7 and an emitter of the eighth triode Q8 are connected to serve as a power supply ground of the third current mirror module, a base electrode and a collector electrode of the seventh triode Q7 are connected with a base electrode of the eighth triode Q8 to serve as an input end of the third current mirror module, and a collector electrode of the eighth triode Q8 serves as an output end of the third current mirror module.
The capacitor charging and releasing module comprises: the positive plate of the capacitor C1 is used as a first input end of a capacitor AND charging module, the negative plate of the capacitor C1 is grounded, the drain electrode of the switching tube SW1 is connected with the positive plate of the capacitor, the source electrode AND the substrate of the switching tube SW1 are grounded, one input end of the AND gate AND1 is used as a second input end of the capacitor charging AND discharging module AND connected with a front bridge arm lower tube switching signal, the other input end of the AND gate AND1 is used as a third input end of the capacitor charging AND discharging module AND connected with a rear bridge arm lower tube switching signal, AND the output end of the AND gate AND1 is connected with the grid electrode of the switching tube SW 1.
The front bridge arm current is copied through a first current mirror to obtain a source current Isource. The current of the rear bridge arm is copied through the second current mirror and then copied once through the third current mirror, and the current direction is changed, so that the pull-down current Isink is obtained.
Isink is subtracted from Isource to obtain a charging current Icap to charge the capacitor C1. Assuming r1=r2=r, then
Whereas for inductance L @>
The inductor current I can be represented by Vcap L 。
Before each switching period is finished, the electric quantity stored in the capacitor is released through the switch SW1, and the switch SW1 is turned on for the front bridge arm lower tube S2 and the rear bridge arm lower tube S4, namely, the circuit enters a phase T4 (inductor current holding phase). Waveforms of the charging capacitor and the inductor current when the four-tube buck-boost converter works in the boost mode (Vin < Vo) are shown in fig. 3, and waveforms of the charging capacitor and the inductor current when the four-tube buck-boost converter works in the buck mode (Vin > Vo) are shown in fig. 4, so that lossless sampling of the inductor current is completed.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereto, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the present invention.
Claims (9)
1. A lossless sampling method for inductance current of four-switch buck-boost converter is characterized in that,
sampling the front bridge arm midpoint voltage, converting the front bridge arm midpoint voltage into a front bridge arm current, and performing replication operation on the front bridge arm current to obtain a source current;
sampling the midpoint voltage of the rear bridge arm, converting the midpoint voltage of the rear bridge arm into rear bridge arm current, and performing copy operation on the rear bridge arm current to obtain pull-down current with the opposite direction to the rear bridge arm current;
extracting a pull-down current from the source current to obtain a charging current injected into the capacitor charging branch;
the discharge branch connected in parallel with the capacitive charge branch is turned on during the inductor current holding phase of each switching cycle and turned off at the beginning of the next switching cycle.
2. The method for lossless sampling of inductance current of a four-switch buck-boost converter according to claim 1, wherein the inductance current holding phase of each switching cycle is determined according to a front-bridge-arm down-tube switching signal and a rear-bridge-arm down-tube switching signal in each switching cycle, and a period in which both the front-bridge-arm down-tube switch and the rear-bridge-arm down-tube switch are turned on in each switching cycle is determined as the inductance current holding phase of each switching cycle.
3. An inductor current lossless sampling circuit of a four-switch buck-boost converter is characterized by comprising:
the input end of the first voltage conversion current module is connected with the midpoint of the front bridge arm and is used for converting the sampled midpoint voltage of the front bridge arm into front bridge arm current;
the power supply end of the first current mirror module is connected with the power supply voltage, the input end of the first current mirror module is connected with the output end of the first voltage conversion current module, and the first current mirror module is used for copying the current of the front bridge arm and outputting the source current;
the input end of the second voltage conversion current module is connected with the midpoint of the rear bridge arm and is used for converting the sampled midpoint voltage of the rear bridge arm into rear bridge arm current;
the power supply end of the second current mirror module is connected with the power supply voltage, and the input end of the second current mirror module is connected with the output end of the second voltage conversion current module and is used for copying the current of the rear bridge arm and outputting the current;
the power supply end of the third current mirror module is grounded, the input end of the third current mirror module is connected with the output end of the second current mirror module and is used for carrying out copy operation on the current output by the second current mirror module, the output end of the third current mirror module is connected with the output end of the first current mirror module and outputs a pull-down current with the opposite direction to the current of the rear bridge arm; the method comprises the steps of,
the first input end of the capacitor charging and releasing module is connected with the output end of the first current mirror module and the output end of the third current mirror module, the second input end of the capacitor charging and releasing module is connected with the front bridge arm down tube switching signal, the third input end of the capacitor charging and releasing module is connected with the rear bridge arm down tube switching signal, the capacitor charging and releasing module is used for extracting pull-down current from source current to obtain charging current injected into a capacitor charging branch, a discharging branch connected with the capacitor charging branch in parallel is connected in an inductor current holding stage of each switching period, and the discharging branch is disconnected at the beginning of the next switching period.
4. The inductor current lossless sampling circuit of a four-switch buck-boost converter according to claim 3, wherein the first voltage-converted-current module includes:
the non-inverting input end of the first operational amplifier is used as the input end of the first voltage conversion current module to be connected with the midpoint of the front bridge arm, and the inverting input end of the first operational amplifier is connected with the emitter of the third triode;
the base electrode of the third triode is connected with the output end of the first operational amplifier, and the collector electrode of the third triode is used as the output end of the first voltage conversion current module; the method comprises the steps of,
and one end of the first resistor is connected with the emitter of the third triode, and the other end of the first resistor is grounded.
5. The inductor-current lossless sampling circuit of a four-switch buck-boost converter of claim 4, wherein the first current mirror module includes:
the emitter of the first triode is connected with the emitter of the second triode to serve as a power supply end of the first current mirror module, and the base and the collector of the first triode are connected with the base of the second triode to serve as an input end of the first current mirror module; the method comprises the steps of,
and the collector electrode of the second triode is used as the output end of the first current mirror module.
6. The inductor current non-destructive sampling circuit of a four-switch buck-boost converter of claim 5, wherein said second voltage-converted current module comprises:
the non-inverting input end of the second operational amplifier is used as the input end of the second voltage conversion current module to be connected with the midpoint of the rear bridge arm, and the inverting input end of the second operational amplifier is connected with the emitter of the sixth triode;
a base electrode of the sixth triode is connected with the output end of the second operational amplifier, and a collector electrode of the sixth triode is used as the output end of the second voltage conversion current module; the method comprises the steps of,
and one end of the second resistor is connected with the emitter of the sixth triode, and the other end of the second resistor is grounded.
7. The inductor-current lossless sampling circuit of a four-switch buck-boost converter of claim 6, wherein the second current mirror module includes:
the emitter of the fourth triode is connected with the emitter of the fifth triode to serve as a power supply end of the second current mirror module, and the base electrode and the collector electrode of the fourth triode are connected with the base electrode of the fifth triode to serve as an input end of the second current mirror module; the method comprises the steps of,
and the collector electrode of the fifth triode is used as the output end of the second current mirror module.
8. The inductor current non-destructive sampling circuit of a four-switch buck-boost converter of claim 7, wherein the third current mirror module includes:
the emitter of the seventh triode is connected with the emitter of the eighth triode to serve as a power supply end of the third current mirror module, and the base electrode and the collector electrode of the seventh triode are connected with the base electrode of the eighth triode to serve as an input end of the third current mirror module; the method comprises the steps of,
and the collector electrode of the eighth triode is used as the output end of the third current mirror module.
9. The inductor-current lossless sampling circuit of a four-switch buck-boost converter of claim 8, wherein the capacitor charge and discharge module comprises: a charging branch comprising a capacitor, a discharging branch comprising a switching tube and an AND gate; the positive plate of the capacitor is used as a first input end of the capacitor charging and releasing module, one input end of the AND gate is used as a second input end of the capacitor charging and releasing module, the other input end of the AND gate is used as a third input end of the capacitor charging and releasing module, the negative plate of the capacitor is grounded, the drain electrode of the switch tube is connected with the positive plate of the capacitor, the source electrode of the switch tube and the substrate are grounded, and the grid electrode of the switch tube is connected with the output end of the AND gate.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116780909A (en) * | 2023-08-17 | 2023-09-19 | 希荻微电子集团股份有限公司 | Voltage conversion circuit and electronic equipment |
| CN116827087A (en) * | 2023-07-14 | 2023-09-29 | 江苏展芯半导体技术有限公司 | Switching power supply current estimation method applied to DCM/BCM mode |
-
2023
- 2023-03-30 CN CN202310330810.2A patent/CN116388575A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116827087A (en) * | 2023-07-14 | 2023-09-29 | 江苏展芯半导体技术有限公司 | Switching power supply current estimation method applied to DCM/BCM mode |
| CN116827087B (en) * | 2023-07-14 | 2024-02-09 | 江苏展芯半导体技术股份有限公司 | Switching power supply current estimation method applied to DCM/BCM mode |
| CN116780909A (en) * | 2023-08-17 | 2023-09-19 | 希荻微电子集团股份有限公司 | Voltage conversion circuit and electronic equipment |
| CN116780909B (en) * | 2023-08-17 | 2023-11-14 | 希荻微电子集团股份有限公司 | Voltage conversion circuit and electronic equipment |
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