CN116633128A - DC-DC conversion device capable of controlling output and control method thereof - Google Patents

DC-DC conversion device capable of controlling output and control method thereof Download PDF

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Publication number
CN116633128A
CN116633128A CN202310605322.8A CN202310605322A CN116633128A CN 116633128 A CN116633128 A CN 116633128A CN 202310605322 A CN202310605322 A CN 202310605322A CN 116633128 A CN116633128 A CN 116633128A
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China
Prior art keywords
circuit
voltage
output
resistor
stage bias
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CN202310605322.8A
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Chinese (zh)
Inventor
周荣
吴军
吴金炳
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Suzhou Luzhiyao Technology Co Ltd
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Suzhou Luzhiyao Technology Co Ltd
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Priority to CN202310605322.8A priority Critical patent/CN116633128A/en
Publication of CN116633128A publication Critical patent/CN116633128A/en
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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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0009—Devices or circuits for detecting current in a converter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

The invention discloses a DC-DC conversion device capable of controlling output and a control method thereof, wherein the device comprises a voltage stabilizing circuit, an output feedback circuit, a control circuit, a front-stage bias amplifying circuit, a sampling circuit and a rear-stage bias amplifying circuit; the input end of the voltage stabilizing circuit is electrically connected with the input power supply, the output end of the voltage stabilizing circuit is electrically connected with the input end of the sampling circuit through the output feedback circuit, the output end of the sampling circuit is respectively electrically connected with the input end of the control circuit and the input end of the rear-stage bias amplifying circuit, the output end of the control circuit is electrically connected with the input end of the rear-stage bias amplifying circuit through the front-stage bias amplifying circuit, and the output end of the rear-stage bias amplifying circuit is electrically connected with the input end of the voltage stabilizing circuit. The invention can realize the bidirectional feedback regulation of the output voltage of the voltage stabilizing circuit in real time, realize the controllable change of output, is not limited to a preset fixed output value, can be suitable for more use environments and has strong universality.

Description

DC-DC conversion device capable of controlling output and control method thereof
Technical Field
The invention relates to the field of electronic devices, in particular to a DC-DC conversion device capable of controlling output and a control method thereof.
Background
With the progress of electronic technology, electronic products have become a necessary tool in life. In order to make electronic products capable of providing diversified functions, it is a necessary trend to supply a plurality of different power sources to an application circuit for use in the electronic products. Among them, it is a relatively common way to generate the required power by means of a DC-DC conversion device.
In the conventional art, a DC-DC conversion device shown in fig. 1 is generally adopted, and the DC-DC conversion device includes a voltage stabilizing circuit and an output feedback circuit, wherein an output end of the voltage stabilizing circuit is electrically connected with an input end of the output feedback circuit, and an output end of the output feedback circuit is electrically connected with an input end of the voltage stabilizing circuit, that is, the output feedback circuit is directly connected with the voltage stabilizing circuit, and the output feedback circuit collects an output voltage of the voltage stabilizing circuit, obtains a feedback voltage and feeds the feedback voltage back to the voltage stabilizing circuit, and adjusts the output voltage thereof according to the feedback voltage based on a feedback adjusting function of the voltage stabilizing circuit, so that the output voltage is stabilized at a preset fixed value.
However, in the above-described conventional DC-DC conversion device, since the feedback voltage is directly fed back to the voltage stabilizing circuit through the output feedback circuit, the feedback voltage received by the voltage stabilizing circuit depends on the sampling function of the output feedback circuit. When the whole DC-DC conversion device leaves the factory, the feedback regulation function of the voltage stabilizing circuit and the sampling function of the output feedback circuit are designed when leaving the factory, so that the output voltage VOUT which can be output and regulated by the traditional DC-DC conversion device is fixed based on the determined feedback regulation function and the sampling function. Therefore, the conventional DC-DC converter cannot output a voltage that varies controllably, which results in that the DC-DC converter cannot be applied to more usage environments and has poor versatility.
Disclosure of Invention
In view of the above, the present invention provides a DC-DC converter capable of controlling output and a control method thereof, so as to solve the problem that the existing DC-DC converter cannot realize controllable output variation and has poor versatility.
The invention provides a DC-DC conversion device capable of controlling output, which comprises a voltage stabilizing circuit, an output feedback circuit, a control circuit, a front-stage bias amplifying circuit, a sampling circuit and a rear-stage bias amplifying circuit, wherein the voltage stabilizing circuit is connected with the output feedback circuit;
the input end of the voltage stabilizing circuit is electrically connected with an input power supply, the output end of the voltage stabilizing circuit is electrically connected with the input end of the sampling circuit through the output feedback circuit, the output end of the sampling circuit is respectively electrically connected with the input end of the control circuit and the input end of the rear-stage bias amplifying circuit, the output end of the control circuit is electrically connected with the input end of the rear-stage bias amplifying circuit through the front-stage bias amplifying circuit, and the output end of the rear-stage bias amplifying circuit is electrically connected with the input end of the voltage stabilizing circuit;
the voltage stabilizing circuit is used for carrying out voltage stabilizing conversion on the input voltage output by the input power supply to obtain an original output voltage;
The output feedback circuit is used for acquiring the original output voltage and acquiring the original feedback voltage according to the original output voltage;
the sampling circuit is used for collecting the original feedback voltage to obtain a sampling voltage, and sending the sampling voltage to the control circuit and the later-stage bias amplifying circuit respectively;
the control circuit is used for generating a pre-stage bias control signal according to the sampling voltage and sending the pre-stage bias control signal to the pre-stage bias amplifying circuit;
the pre-stage bias amplifying circuit is used for amplifying according to the pre-stage bias control signal to obtain a pre-stage bias voltage, and sending the pre-stage bias voltage to the post-stage bias amplifying circuit;
the back-stage bias amplifying circuit is used for amplifying according to the sampling voltage and the front-stage bias voltage to obtain a target feedback voltage, and sending the target feedback voltage to the voltage stabilizing circuit;
the voltage stabilizing circuit is also used for adjusting the original output voltage according to the target feedback voltage to obtain a target output voltage.
Optionally, the pre-stage bias amplifying circuit comprises a first operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor;
The positive power input pin of the first operational amplifier is electrically connected with a +5V power end, the negative power input pin of the first operational amplifier is electrically connected with a-5V power end, the positive input pin of the first operational amplifier is electrically connected with the output end of the control circuit through the first resistor, and the positive input pin of the first operational amplifier is also electrically connected with the reference power end through the second resistor; the inverting input pin of the first operational amplifier is grounded through the fourth resistor, the first end of the third resistor is connected to the common connection end between the non-inverting input pin of the first operational amplifier and the first resistor, and the second end of the third resistor is grounded; the inverting input pin of the first operational amplifier is also electrically connected with the output pin of the first operational amplifier through the fifth resistor, and the output pin of the first operational amplifier is also electrically connected with the input end of the rear-stage bias amplifying circuit.
Optionally, the sampling circuit includes a sixth resistor, a seventh resistor, an eighth resistor, and a first capacitor;
the first end of the eighth resistor is electrically connected with the output end of the output feedback circuit, the second end of the eighth resistor is electrically connected with the input end of the control circuit, the first end of the eighth resistor is also electrically connected with the input end of the post-stage bias amplifying circuit through the sixth resistor, the first end of the first capacitor is connected to a common connection end between the second end of the eighth resistor and the input end of the control circuit, the second end of the first capacitor is grounded, and the second end of the first capacitor is also electrically connected with the input end of the post-stage bias amplifying circuit through the seventh resistor.
Optionally, the post-stage bias amplifying circuit comprises a second operational amplifier, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a second capacitor and a third capacitor;
the power input pin of the second operational amplifier is electrically connected with the circuit power supply end VCC, and the grounding pin of the second operational amplifier is grounded; the positive input pin of the second operational amplifier is electrically connected with the output end of the front-stage bias amplifying circuit through the ninth resistor, the positive input pin of the second operational amplifier is also grounded through the tenth resistor, the first end of the second capacitor is connected to the common connection end between the ninth resistor and the output end of the front-stage bias amplifying circuit, the second end of the second capacitor is grounded, and the positive input pin of the second operational amplifier is also electrically connected with the first end of the sixth resistor; the inverting input pin of the second operational amplifier is electrically connected with the first end of the seventh resistor, the inverting input pin of the second operational amplifier is also electrically connected with the output pin of the second operational amplifier through the eleventh resistor, the output pin of the second operational amplifier is electrically connected with the input end of the voltage stabilizing circuit through the twelfth resistor, the first end of the third capacitor is connected to the common connection end between the twelfth resistor and the input end of the voltage stabilizing circuit, and the second end of the third capacitor is grounded.
Optionally, the voltage stabilizing circuit includes a voltage stabilizing chip, a thirteenth resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, an inductor and a diode;
the power input pin VIN and the enable pin EN of the voltage stabilizing chip are electrically connected with the input power supply, the first end of the fourth capacitor and the first end of the fifth capacitor are connected to a common connection end between the power input pin VIN of the voltage stabilizing chip and the input power supply, and the second end of the fourth capacitor and the second end of the fifth capacitor are grounded; the multifunctional control pin RT/SYNC of the voltage stabilizing chip is grounded through the thirteenth resistor; the ground pin GND and the ground potential pin EPAD of the voltage stabilizing chip are both grounded, the sampling pin SS of the voltage stabilizing chip is grounded through the seventh capacitor, and the input feedback pin FB of the voltage stabilizing chip is electrically connected with the output end of the rear-stage bias amplifying circuit; the switch pin BOOT of steady voltage chip pass through sixth electric capacity with steady voltage chip's output pin SW electricity is connected, steady voltage chip's output pin SW still passes through the inductance respectively with output feedback circuit's input and external equipment electricity are connected, the negative pole of diode is connected steady voltage chip's output pin with on the common link between the inductance, the positive pole ground connection of diode, eighth electric capacity's first end with ninth electric capacity's first end is all connected on the common link between inductance with output feedback circuit's input, eighth electric capacity's second end with ninth electric capacity's second end is all grounded.
Optionally, the output feedback circuit includes a fourteenth resistor and a fifteenth resistor;
the first end of the fourteenth resistor is connected to a common connection end between the inductor and the external equipment, the second end of the fourteenth resistor is grounded through the fifteenth resistor, and the input end of the sampling circuit is connected to the common connection end between the second end of the fourteenth resistor and the fifteenth resistor.
Optionally, the apparatus further comprises a follower circuit;
the input end of the follower circuit is electrically connected with the output end of the output feedback circuit, and the output end of the follower circuit is electrically connected with the input end of the sampling circuit;
the follower circuit is configured to send the original feedback voltage output by the output feedback circuit to the sampling circuit, and prevent the target feedback voltage in the post-stage bias amplifying circuit from returning to the output feedback circuit through the sampling circuit.
Optionally, the follower circuit includes a third operational amplifier;
the power input pin of the third operational amplifier is electrically connected with the circuit power supply end VCC, the grounding pin of the third operational amplifier is grounded, the normal phase input pin of the third operational amplifier is electrically connected with the output end of the output feedback circuit, the reverse phase input pin of the third operational amplifier is electrically connected with the output pin of the third operational amplifier, and the output pin of the third operational amplifier is also electrically connected with the input end of the sampling circuit.
Optionally, the control circuit comprises a singlechip with an analog-to-digital conversion pin and a digital-to-analog conversion pin;
the output end of the sampling circuit is electrically connected with the analog-to-digital conversion pin of the singlechip, and the digital-to-analog conversion pin of the singlechip is electrically connected with the input end of the front-stage bias amplifying circuit;
the singlechip is used for accessing the sampling voltage acquired by the sampling circuit through the analog-to-digital conversion pin and performing analog-to-digital conversion on the sampling voltage to obtain a digital voltage signal; and the digital-to-analog conversion pin is used for generating a digital control signal according to the digital voltage signal, carrying out digital-to-analog conversion on the digital control signal to obtain an analog front-stage bias control signal, and sending the analog front-stage bias control signal to the front-stage bias amplifying circuit.
In addition, the invention also provides a control method of the DC-DC conversion device capable of controlling output, the DC-DC conversion device capable of controlling output is adopted to output target output voltage, and the method comprises the following steps:
the voltage stabilizing circuit is used for stabilizing and converting the input voltage output by the input power supply to obtain an original output voltage;
the original output voltage is obtained by utilizing an output feedback circuit, and the original feedback voltage is obtained according to the original output voltage;
Collecting the original feedback voltage by using a sampling circuit to obtain a sampling voltage;
generating a pre-stage bias control signal according to the sampling voltage by using a control circuit, and amplifying by using a pre-stage bias amplifying circuit according to the pre-stage bias control signal to obtain a pre-stage bias voltage;
the sampling voltage and the front-stage bias voltage are respectively obtained by a rear-stage bias amplifying circuit, and the target feedback voltage is obtained by amplifying according to the sampling voltage and the front-stage bias voltage;
and regulating the original output voltage by using the voltage stabilizing circuit according to the target feedback voltage to obtain the target output voltage.
The invention has the beneficial effects that: the sampling circuit, the control circuit, the front-stage bias amplifying circuit and the rear-stage bias amplifying circuit are respectively added between the output end of the output feedback circuit and the input end of the voltage stabilizing circuit, the sampling circuit is used for collecting the original feedback voltage output by the output feedback circuit, the sampling voltage is obtained and is sent into the control circuit, so that a feedback closed loop is formed conveniently, and the feedback monitoring of the output voltage of the voltage stabilizing circuit is realized; the control circuit generates a front-stage bias control signal according to the received sampling voltage, the front-stage bias control signal can control the amplification of a front-stage bias amplifying circuit of a rear stage, and as the front-stage bias control signal is an analog signal output by the control circuit, the front-stage bias voltage which can be positive or negative can be obtained by utilizing the amplification of the front-stage bias amplifying circuit, and can be used as a reference voltage for controlling and adjusting the sampling voltage, so that the controllable bidirectional adjustment of the output voltage can be realized conveniently; the sampling voltage acquired by the sampling circuit and the front-stage bias voltage obtained by the front-stage bias amplifying circuit are both sent to the rear-stage bias amplifying circuit, the amplification is carried out based on the sampling voltage and the front-stage bias voltage, and the front-stage bias voltage is taken as a reference, so that a target feedback voltage for controlling the voltage stabilizing circuit to bidirectionally regulate the voltage output by the output end of the voltage stabilizing circuit can be obtained; the voltage stabilizing circuit carries out forward regulation or reverse regulation on the original output voltage according to the target feedback voltage, so that the feedback regulation of the output voltage of the voltage stabilizing circuit is realized, and the output controllable change of the whole DC-DC conversion device is realized, and the voltage stabilizing circuit is not limited to a preset fixed output value;
The DC-DC conversion device capable of controlling output and the control method thereof can realize bidirectional feedback adjustment of the output voltage of the voltage stabilizing circuit in real time, realize controllable change of output, are not limited to preset fixed output values, can be suitable for more use environments, and have strong universality.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and should not be construed as limiting the invention in any way, in which:
fig. 1 shows a structural diagram of a conventional DC-DC conversion device;
fig. 2 is a block diagram showing a DC-DC converter capable of controlling output in accordance with a first embodiment of the present invention;
fig. 3 shows a design diagram of a sampling circuit, a control circuit, a front-stage bias amplifying circuit, a rear-stage bias amplifying circuit, and a follower circuit in a DC-DC converter capable of controlling output in the first embodiment of the present invention;
fig. 4 shows a design diagram of a voltage stabilizing circuit and an output feedback circuit in a DC-DC converter capable of controlling output according to a first embodiment of the present invention;
fig. 5 is a block diagram showing another output-controllable DC-DC converter according to the first embodiment of the present invention;
fig. 6 is a flowchart showing a control method of an output-controllable DC-DC converter according to a second embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
Example 1
As shown in fig. 2, a DC-DC conversion device capable of controlling output, the device comprises a voltage stabilizing circuit, an output feedback circuit, a control circuit, a front-stage bias amplifying circuit, a sampling circuit and a rear-stage bias amplifying circuit;
the input end of the voltage stabilizing circuit is electrically connected with an input power supply, the output end of the voltage stabilizing circuit is electrically connected with the input end of the sampling circuit through the output feedback circuit, the output end of the sampling circuit is respectively electrically connected with the input end of the control circuit and the input end of the rear-stage bias amplifying circuit, the output end of the control circuit is electrically connected with the input end of the rear-stage bias amplifying circuit through the front-stage bias amplifying circuit, and the output end of the rear-stage bias amplifying circuit is electrically connected with the input end of the voltage stabilizing circuit;
The voltage stabilizing circuit is used for carrying out voltage stabilizing conversion on the input voltage output by the input power supply to obtain an original output voltage;
the output feedback circuit is used for acquiring the original output voltage and acquiring the original feedback voltage according to the original output voltage;
the sampling circuit is used for collecting the original feedback voltage to obtain a sampling voltage, and sending the sampling voltage to the control circuit and the later-stage bias amplifying circuit respectively;
the control circuit is used for generating a pre-stage bias control signal according to the sampling voltage and sending the pre-stage bias control signal to the pre-stage bias amplifying circuit;
the pre-stage bias amplifying circuit is used for amplifying according to the pre-stage bias control signal to obtain a pre-stage bias voltage, and sending the pre-stage bias voltage to the post-stage bias amplifying circuit;
the back-stage bias amplifying circuit is used for amplifying according to the sampling voltage and the front-stage bias voltage to obtain a target feedback voltage, and sending the target feedback voltage to the voltage stabilizing circuit;
the voltage stabilizing circuit is also used for adjusting the original output voltage according to the target feedback voltage to obtain a target output voltage.
In the conventional DC-DC converter shown in fig. 1, the feedback voltage obtained by the voltage stabilizing circuit is completely equal to the feedback voltage output by the output feedback circuit, and the feedback regulation function of the voltage stabilizing circuit depends on the feedback regulation function of the voltage stabilizing circuit itself and the sampling function of the output feedback circuit, so that the output voltage VOUT that can be output and regulated by the whole device is fixed (for example, 0.75V). With conventional DC-DC conversion devices, only an uncontrollably variable output power supply can be provided.
In the DC-DC converter of this embodiment, a sampling circuit, a control circuit, a pre-stage bias amplifying circuit, and a post-stage bias amplifying circuit are respectively added between the output end of the output feedback circuit and the input end of the voltage stabilizing circuit, and the sampling circuit is used to collect the original feedback voltage output by the output feedback circuit, obtain the sampling voltage, and send the sampling voltage into the control circuit, so as to form a feedback closed loop, and realize feedback monitoring of the output voltage of the voltage stabilizing circuit; the control circuit generates a front-stage bias control signal according to the received sampling voltage, the front-stage bias control signal can control the amplification of a front-stage bias amplifying circuit of a rear stage, and as the front-stage bias control signal is an analog signal output by the control circuit, the front-stage bias voltage which can be positive or negative can be obtained by utilizing the amplification of the front-stage bias amplifying circuit, and can be used as a reference voltage for controlling and adjusting the sampling voltage, so that the controllable bidirectional adjustment of the output voltage can be realized conveniently; the sampling voltage acquired by the sampling circuit and the front-stage bias voltage obtained by the front-stage bias amplifying circuit are both sent to the rear-stage bias amplifying circuit, the amplification is carried out based on the sampling voltage and the front-stage bias voltage, and the front-stage bias voltage is taken as a reference, so that a target feedback voltage for controlling the voltage stabilizing circuit to bidirectionally regulate the voltage output by the output end of the voltage stabilizing circuit can be obtained; the voltage stabilizing circuit carries out forward regulation or reverse regulation on the original output voltage according to the target feedback voltage, so that the feedback regulation of the output voltage of the voltage stabilizing circuit is realized, and the output controllable change of the whole DC-DC conversion device is realized, and the voltage stabilizing circuit is not limited to a preset fixed output value.
Compared with the traditional DC-DC conversion device, the output end of the output feedback circuit is not directly connected with the input end of the voltage stabilizing circuit, but a sampling circuit, a control circuit, a front-stage bias amplifying circuit and a rear-stage bias amplifying circuit are respectively added between the output end of the output feedback circuit and the input end of the voltage stabilizing circuit, so that bidirectional feedback adjustment of output voltage of the voltage stabilizing circuit can be realized in real time, controllable change of output is realized, the output device is not limited to a preset fixed output value, more use environments can be applied, and the universality is strong.
Preferably, as shown in fig. 3, the pre-stage bias amplifying circuit includes a first operational amplifier U3, a first resistor R10, a second resistor R2, a third resistor R15, a fourth resistor R8, and a fifth resistor R7;
the positive power input pin of the first operational amplifier U3 is electrically connected with a +5V power supply end, the negative power input pin of the first operational amplifier U3 is electrically connected with a-5V power supply end, the positive input pin of the first operational amplifier U3 is electrically connected with the output end of the control circuit through the first resistor R10, and the positive input pin of the first operational amplifier U3 is also electrically connected with a reference power supply end through the second resistor R2; the inverting input pin of the first operational amplifier U3 is grounded through the fourth resistor R8, a first end of the third resistor R15 is connected to a common connection end between the non-inverting input pin of the first operational amplifier U3 and the first resistor R10, and a second end of the third resistor R15 is grounded; the inverting input pin of the first operational amplifier U3 is further electrically connected with the output pin of the first operational amplifier U3 through the fifth resistor R7, and the output pin of the first operational amplifier U3 is further electrically connected with the input end of the rear-stage bias amplifying circuit.
As shown in fig. 3, in the pre-stage bias amplifying circuit with the above structure, the first operational amplifier accesses the pre-stage bias control signal VDA sent by the control circuit through the first resistor R10, and because the signal VDA is an analog signal and can only be positive, the first operational amplifier accesses the reference voltage VBIS provided by the reference power supply terminal through the second resistor R2, and by using the setting of the reference voltage VBIS, and by combining the function of the first operational amplifier, the pre-stage bias control signal VDA which can only be positive is amplified into the reference voltage VREF (i.e., the pre-stage bias voltage) which can be positive or negative, and by using the reference voltage VREF which can be positive or negative, the subsequent amplification by the post-stage bias amplifying circuit is facilitated, so as to realize the adjustment or the decrease of the sampling voltage, and further obtain the target feedback voltage for controlling the bidirectional adjustment of the original output voltage.
In the front-stage bias amplifying circuit shown in fig. 3, the reference voltage VREF (or the front-stage bias voltage) can be obtained as follows:
VREF＝(R7+R8)/R8*(R2*R15*VDA+R10*R15*VBIS)/(R2*R15+R2*R10+R10*R15)；
when R2 is equal to R15 and VDA is equal to R10 is equal to R15 and VBIS is greater than 0, VREF is greater than 0 can be obtained;
when r2×r15+r10×r15=0, vref=0 can be obtained;
when r2×r15+r10×r15×vbis < 0, VREF < 0 can be obtained.
Preferably, as shown in fig. 3, the sampling circuit includes a sixth resistor R5, a seventh resistor R6, an eighth resistor R9, and a first capacitor C2;
The first end of the eighth resistor R9 is electrically connected with the output end of the output feedback circuit, the second end of the eighth resistor R9 is electrically connected with the input end of the control circuit, the first end of the eighth resistor R9 is also electrically connected with the input end of the rear-stage bias amplifying circuit through the sixth resistor R5, the first end of the first capacitor C2 is connected to the common connection end between the second end of the eighth resistor R9 and the input end of the control circuit, the second end of the first capacitor C2 is grounded, and the second end of the first capacitor C2 is also electrically connected with the input end of the rear-stage bias amplifying circuit through the seventh resistor R6.
The sampling circuit with the structure can collect the original feedback voltage output by the output feedback circuit and process the original feedback voltage into the sampling voltage, and on one hand, the sampling voltage is sent into the control circuit so as to generate a pre-stage bias control signal for controlling the pre-stage bias amplifying circuit to amplify the pre-stage bias control signal, so that the pre-stage bias voltage which can be positive and negative is obtained, and a reference voltage for bidirectional regulation is provided for the sampling voltage; on the other hand, the data is sent to a later-stage bias amplifying circuit and used as a data source for generating target feedback voltage, so that the generation of the target feedback voltage is ensured.
Preferably, as shown in fig. 3, the control circuit includes a single chip microcomputer having an analog-to-digital conversion pin and a digital-to-analog conversion pin;
the output end of the sampling circuit is electrically connected with the analog-to-digital conversion pin of the singlechip, and the digital-to-analog conversion pin of the singlechip is electrically connected with the input end of the front-stage bias amplifying circuit;
the singlechip is used for accessing the sampling voltage acquired by the sampling circuit through the analog-to-digital conversion pin and performing analog-to-digital conversion on the sampling voltage to obtain a digital voltage signal; and the digital-to-analog conversion pin is used for generating a digital control signal according to the digital voltage signal, carrying out digital-to-analog conversion on the digital control signal to obtain an analog front-stage bias control signal, and sending the analog front-stage bias control signal to the front-stage bias amplifying circuit.
By the singlechip, the analog sampling voltage is conveniently received and digitized, the singlechip is conveniently analyzed and generates a digital control signal, and meanwhile, the digital control signal is conveniently converted into an analog front-stage bias control signal required by a front-stage bias amplifying circuit connected with the singlechip, so that the singlechip can control the front-stage bias amplifying circuit.
As shown in fig. 3, the analog-digital conversion pin of the singlechip is an a/D pin, the digital-analog conversion pin is a D/a pin, a first end of an eighth resistor R9 in the sampling circuit is electrically connected with an output end of the output feedback circuit, an original feedback voltage output by the output end of the output feedback circuit is VOFB, the original feedback voltage is sampled by the eighth resistor R9, a second end of the eighth resistor R9 obtains a sampling voltage VA/D, and the sampling voltage VA/D is connected with the a/D pin of the singlechip and is sent into the singlechip; the singlechip generates a digital control signal according to the sampling voltage VA/D analog-to-digital conversion, performs digital-to-analog conversion through a D/A pin, generates an analog front-stage bias control signal VDA, and sends the analog front-stage bias control signal VDA to a non-inverting input pin of the first operational amplifier U3 through a first resistor R10 in the front-stage bias amplifying circuit.
Preferably, as shown in fig. 3, the post-stage bias amplifying circuit includes a second operational amplifier U1, a ninth resistor R3, a tenth resistor R4, an eleventh resistor R1, a twelfth resistor R11, a second capacitor C1, and a third capacitor C4;
the power input pin of the second operational amplifier U1 is electrically connected with the circuit power supply end VCC, and the grounding pin of the second operational amplifier U1 is grounded; the positive input pin of the second operational amplifier U1 is electrically connected with the output end of the pre-stage bias amplifying circuit through the ninth resistor R3, the positive input pin of the second operational amplifier U1 is further grounded through the tenth resistor R4, the first end of the second capacitor C1 is connected to the common connection end between the ninth resistor R3 and the output end of the pre-stage bias amplifying circuit, the second end of the second capacitor C1 is grounded, and the positive input pin of the second operational amplifier U1 is further electrically connected with the first end of the sixth resistor R5; the inverting input pin of the second operational amplifier U1 is electrically connected with the first end of the seventh resistor R6, the inverting input pin of the second operational amplifier U1 is also electrically connected with the output pin of the second operational amplifier U1 through the eleventh resistor R1, the output pin of the second operational amplifier U1 is electrically connected with the input end of the voltage stabilizing circuit through the twelfth resistor R11, the first end of the third capacitor C4 is connected to the common connection end between the twelfth resistor R11 and the input end of the voltage stabilizing circuit, and the second end of the third capacitor C4 is grounded.
In the post-stage bias amplifying circuit with the structure, the sampling voltage output by the sampling circuit and the pre-stage bias voltage output by the pre-stage bias amplifying circuit are both sent to the signal end (comprising a positive input pin and a negative input pin) of the second operational amplifier, so that the pre-stage bias voltage provided by the pre-stage bias amplifying circuit is taken as a reference to carry out bidirectional regulation on the sampling voltage, and further, the target feedback voltage capable of realizing bidirectional regulation on the original output voltage is generated.
IN the post-stage bias amplifying circuit shown IN fig. 3, the obtained target feedback voltage vfb_in is as follows:
VFB_IN＝(R1+R6)/R6*(R3*R4*VOFB+R4*R5*VREF)/(R3*R4+R3*R5+R5*R4)；
when VREF is less than 0, VFB_IN is less than VOFB, namely the target feedback voltage is smaller than the original feedback voltage, after the voltage stabilizing circuit receives the target feedback voltage smaller than the original feedback voltage, the output of the voltage stabilizing circuit can be regulated by combining the function of the voltage stabilizing circuit, namely the regulation of the original output voltage (particularly VOUT) is realized;
when vref=0, vfb_in=vofb can be obtained, that is, the target feedback voltage is equal to the original feedback voltage, and after the voltage stabilizing circuit receives the target feedback voltage equal to the original feedback voltage, the voltage stabilizing circuit does not turn up or turn down its own output, that is, the original output voltage (specifically VOUT) is not regulated;
When VREF is more than 0, VFB_IN is more than VOFB, namely the target feedback voltage is larger than the original feedback voltage, after the voltage stabilizing circuit receives the target feedback voltage which is larger than the original feedback voltage, the output of the voltage stabilizing circuit can be reduced by combining the function of the voltage stabilizing circuit, namely the original output voltage (particularly VOUT) is reduced.
Preferably, as shown in fig. 4, the voltage stabilizing circuit includes a voltage stabilizing chip U2, a thirteenth resistor R13, a fourth capacitor C7, a fifth capacitor C8, a sixth capacitor C6, a seventh capacitor C15, an eighth capacitor C11, a ninth capacitor C12, an inductor L2, and a diode D2;
the power input pin VIN and the enable pin EN of the voltage stabilizing chip U2 are electrically connected with the input power supply, the first end of the fourth capacitor C7 and the first end of the fifth capacitor C8 are both connected to a common connection end between the power input pin VIN of the voltage stabilizing chip U2 and the input power supply, and the second end of the fourth capacitor C7 and the second end of the fifth capacitor C8 are both grounded; the multifunctional control pin RT/SYNC of the voltage stabilizing chip U2 is grounded through the thirteenth resistor R13; the ground pin GND and the ground potential pin EPAD of the voltage stabilizing chip U2 are both grounded, the sampling pin SS of the voltage stabilizing chip U2 is grounded through the seventh capacitor C15, and the input feedback pin FB of the voltage stabilizing chip U2 is electrically connected with the output end of the post-stage bias amplifying circuit; the switch pin BOOT of the voltage stabilizing chip U2 is electrically connected with the output pin SW of the voltage stabilizing chip U2 through the sixth capacitor C6, and the output pin SW of the voltage stabilizing chip U2 is also electrically connected with the input end of the output feedback circuit and external equipment through the inductor L2 respectively; the negative electrode of the diode D2 is connected to a common connection end between the output pin of the voltage stabilizing chip U2 and the inductor L2, the positive electrode of the diode D2 is grounded, the first end of the eighth capacitor C11 and the first end of the ninth capacitor C12 are both connected to a common connection end between the inductor L2 and the input end of the output feedback circuit, and the second end of the eighth capacitor C11 and the second end of the ninth capacitor C12 are both grounded.
Through the voltage stabilizing circuit, on one hand, the voltage stabilizing conversion of the input voltage output by the input power supply can be realized, and the required direct current voltage is generated; on the other hand, the input feedback pin FB of the voltage stabilizing chip is connected to the target feedback voltage output by the post-stage bias amplifying circuit in real time, and bidirectional feedback adjustment of the original output voltage is realized according to the target feedback voltage, so that the output controllable change of the whole DC-DC conversion device is realized.
Preferably, as shown in fig. 4, the output feedback circuit includes a fourteenth resistor R12 and a fifteenth resistor R14;
the first end of the fourteenth resistor R12 is connected to a common connection end between the inductor L2 and the external device, the second end of the fourteenth resistor R12 is grounded through the fifteenth resistor R14, and the input end of the sampling circuit is connected to a common connection end between the second end of the fourteenth resistor R12 and the fifteenth resistor R14.
The voltage dividing circuit formed by the fourteenth resistor R12 and the fifteenth resistor R14 can accurately feed back the original output voltage output by the output pin of the voltage stabilizing chip in real time.
With respect to the circuit structure shown IN fig. 4, if the voltage stabilizing circuit and the output feedback circuit IN the conventional DC-DC conversion device are respectively designed according to the voltage stabilizing circuit and the output feedback circuit shown IN fig. 4, IN the conventional DC-DC conversion device, the second end of the fourteenth resistor R12 is directly connected to the input feedback pin FB of the voltage stabilizing chip U2, and the output voltage VOUT output by the voltage stabilizing chip is directly fed back to the input feedback pin of the voltage stabilizing chip U2 through the voltage dividing circuit formed by the fourteenth resistor R12 and the fifteenth resistor R14, so that the feedback voltage vfb_in obtained by the voltage stabilizing chip is equal to the voltage VOFB obtained by the output voltage VOUT through the voltage dividing circuit, that is, the feedback voltage vfb_in depends on the proportional relationship between the fourteenth resistor R12 and the fifteenth resistor R14, and the output voltage VOUT that can be output and regulated by the conventional DC-DC conversion device is constant based on the determined fourteenth resistor R12 and the fifteenth resistor R14. In this embodiment, the circuit structure shown in fig. 3 is connected between the voltage stabilizing circuit and the output feedback circuit shown in fig. 4, so as to implement the controllable change adjustment of the original output voltage output by the voltage stabilizing circuit, and the method is not limited to a preset fixed value.
Preferably, as shown in fig. 5, the apparatus further comprises a follower circuit;
the input end of the follower circuit is electrically connected with the output end of the output feedback circuit, and the output end of the follower circuit is electrically connected with the input end of the sampling circuit;
the follower circuit is configured to send the original feedback voltage output by the output feedback circuit to the sampling circuit, and prevent the target feedback voltage in the post-stage bias amplifying circuit from returning to the output feedback circuit through the sampling circuit.
The following circuit is added between the output feedback circuit and the sampling circuit, the original feedback voltage is transmitted to the sampling circuit through the following circuit, on one hand, the sampling of the original feedback voltage is conveniently realized, the output capability of the output feedback circuit is improved, on the other hand, the electric isolation function is also realized, the target feedback voltage in the later-stage bias amplifying circuit connected with the sampling circuit is prevented from returning to the output feedback circuit through the sampling circuit, the real sampling of the sampling circuit is influenced, and further, the accuracy of the target feedback voltage is influenced when the sampling voltage is amplified in the later-stage bias amplifying circuit, and finally the control precision of the output controllable change of the whole DC-DC conversion device is influenced.
Specifically, as shown in fig. 3, the follower circuit includes a third operational amplifier U4;
the power input pin of the third operational amplifier U4 is electrically connected with the circuit power supply end VCC, the grounding pin of the third operational amplifier U4 is grounded, the normal phase input pin of the third operational amplifier U4 is electrically connected with the output end of the output feedback circuit, the reverse phase input pin of the third operational amplifier U4 is electrically connected with the output pin of the third operational amplifier U4, and the output pin of the third operational amplifier U4 is also electrically connected with the input end of the sampling circuit.
By the following circuit with the structure, the voltage (namely the original feedback voltage) in the input direction of the third operational amplifier flows to the sampling circuit of the rear stage, the voltage signal (namely the target feedback voltage) in the rear stage bias amplifying circuit cannot be transmitted to the sampling circuit, the flowing direction of the voltage signal is accurately limited, the output capacity is improved, the electric isolation function is achieved, and the controllable output of the final target output voltage cannot be influenced.
The present embodiment constitutes the entire DC-DC conversion device capable of controlling output based on the follower circuit, the sampling circuit, the control circuit, the front-stage bias amplifying circuit, and the rear-stage bias amplifying circuit shown in fig. 3, and the voltage stabilizing circuit and the output feedback circuit shown in fig. 4. IN the DC-DC conversion device, the reference voltage VBIS provided by a reference power supply end IN a pre-stage bias amplifying circuit is set, then the VDA output by a singlechip is utilized, the control of the polarity of a pre-stage bias voltage (or reference voltage) VREF (comprising > 0, =0 and < 0) can be realized, and further the post-stage bias amplifying circuit is utilized to control VOFB > VFB_IN, VOFB=VFB_IN or VOFB < VFB_IN, so that the bidirectional regulation of the output voltage of the whole DC-DC conversion device is realized.
Preferably, for each resistor in the DC-DC converter composed of fig. 3 and 4, the following relationship is designed:
R2＝R15＝2*R10，R7＝R8，R3＝R4＝2*R5，R6＝R1；
the target output voltage VOUT1 (denoted as VOUT1, which is distinguished from the original output voltage VOUT and indicates that both are output by the voltage stabilizing circuit, but the specific values may be different) is obtained by:
VOUT1＝(R12+R14)*VOFB/R14
＝[(R12+R14)/R14]*(VFB_IN-VREF/2)
＝[(R12+R14)/R14]*(VFB_IN-VDA/2–VBIS/4)。
in this embodiment, since VDA is an analog signal, it can only be positive, and in order to make the voltage adjustment bidirectional adjustable, the reference voltage VBIS is designed to be a negative voltage, and the up-and-down adjustment can be achieved by adjusting VOUT1 through VDA. In order for VOUT1 to output properly, VOUT1 must be guaranteed to be >0, so it must be guaranteed that:
VDA<2*(VFB_IN-VBIS/4)；
assuming that VDA is at most 3.3V, VBIS takes-3.3V at which point:
when vda=1.65v, vref=0v, vofb=vfb_in, unregulated;
when VDA >1.65V, VREF >0, VOFB < VFB_IN, VOUT1 becomes smaller;
when VDA <1.65V, VREF <0, VOFB > VFB_IN, VOUT1 becomes large.
The result of the calculation formula of VOUT1 is:
VOUT1＝[(R12+R14)/R14]*(0.75+0.825-VDA/2)
＝[(R12+R14)/R14]*(1.575-VDA/2)
at this point, VOUT1 must be guaranteed to be >0 for VOUT1 to output normally, so VDA <3.15V can be controlled.
Specifically, in this embodiment, the voltage stabilizing chip U2 is an LMR14020SDDAR model, the first operational amplifier U3 and the third operational amplifier U4 are both an LM321M5X/TR model, the second operational amplifier U1 is an LM321M5X/TR model or an LM321G-AE5-R model, and electronic components such as a singlechip, resistors, capacitors, etc. may be selected to have appropriate specifications or models according to actual situations, which are not listed here.
Example two
As shown in fig. 6, a control method of a DC-DC converter capable of controlling output, which adopts the DC-DC converter capable of controlling output of the first embodiment, outputs a target output voltage, includes:
s1: the voltage stabilizing circuit is used for stabilizing and converting the input voltage output by the input power supply to obtain an original output voltage;
s2: the original output voltage is obtained by utilizing an output feedback circuit, and the original feedback voltage is obtained according to the original output voltage;
s3: collecting the original feedback voltage by using a sampling circuit to obtain a sampling voltage;
s4: generating a pre-stage bias control signal according to the sampling voltage by using a control circuit, and amplifying by using a pre-stage bias amplifying circuit according to the pre-stage bias control signal to obtain a pre-stage bias voltage;
s5: the sampling voltage and the front-stage bias voltage are respectively obtained by a rear-stage bias amplifying circuit, and the target feedback voltage is obtained by amplifying according to the sampling voltage and the front-stage bias voltage;
s6: and regulating the original output voltage by using the voltage stabilizing circuit according to the target feedback voltage to obtain the target output voltage.
The sampling circuit is used for collecting and outputting the original feedback voltage output by the feedback circuit, so as to obtain the sampling voltage and send the sampling voltage into the control circuit, so that a feedback closed loop is formed conveniently, and feedback monitoring of the output voltage of the voltage stabilizing circuit is realized; the control circuit is used for generating a front-stage bias control signal according to the received sampling voltage, the front-stage bias control signal can control the amplification of a front-stage bias amplifying circuit of a rear stage, and as the front-stage bias control signal is an analog signal output by the control circuit, the front-stage bias voltage which can be positive or negative can be obtained by the amplification of the front-stage bias amplifying circuit and can be used as a reference voltage for controlling and adjusting the sampling voltage, so that the controllable bidirectional adjustment of the output voltage can be realized conveniently; the sampling voltage acquired by the sampling circuit and the front-stage bias voltage obtained by the front-stage bias amplifying circuit are both sent to the rear-stage bias amplifying circuit, the amplification is carried out based on the sampling voltage and the front-stage bias voltage, and the front-stage bias voltage is taken as a reference, so that a target feedback voltage for controlling the voltage stabilizing circuit to bidirectionally regulate the voltage output by the output end of the voltage stabilizing circuit can be obtained; the original output voltage is adjusted forward or reversely by the voltage stabilizing circuit according to the target feedback voltage, so that the feedback adjustment of the output voltage of the voltage stabilizing circuit is realized, and the output controllable change of the whole DC-DC conversion device is realized, and the voltage stabilizing circuit is not limited to a preset fixed output value.
The control method of the embodiment can realize the bidirectional feedback adjustment of the output voltage of the voltage stabilizing circuit in real time, realize the controllable change of output, is not limited to a preset fixed output value, can be suitable for more use environments, and has strong universality.
The structure of the DC-DC converter capable of controlling output adopted by the control method in this embodiment is identical to that of the DC-DC converter capable of controlling output in the first embodiment, so that details of this embodiment are not fully described, and detailed descriptions of the first embodiment and fig. 1 to 5 are omitted herein.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations are within the scope of the invention as defined by the appended claims.

Claims (10)

1. The DC-DC conversion device capable of controlling output comprises a voltage stabilizing circuit and an output feedback circuit, and is characterized by further comprising a control circuit, a front-stage bias amplifying circuit, a sampling circuit and a rear-stage bias amplifying circuit;
the input end of the voltage stabilizing circuit is electrically connected with an input power supply, the output end of the voltage stabilizing circuit is electrically connected with the input end of the sampling circuit through the output feedback circuit, the output end of the sampling circuit is respectively electrically connected with the input end of the control circuit and the input end of the rear-stage bias amplifying circuit, the output end of the control circuit is electrically connected with the input end of the rear-stage bias amplifying circuit through the front-stage bias amplifying circuit, and the output end of the rear-stage bias amplifying circuit is electrically connected with the input end of the voltage stabilizing circuit;
The voltage stabilizing circuit is used for carrying out voltage stabilizing conversion on the input voltage output by the input power supply to obtain an original output voltage;
the output feedback circuit is used for acquiring the original output voltage and acquiring the original feedback voltage according to the original output voltage;
the sampling circuit is used for collecting the original feedback voltage to obtain a sampling voltage, and sending the sampling voltage to the control circuit and the later-stage bias amplifying circuit respectively;
the control circuit is used for generating a pre-stage bias control signal according to the sampling voltage and sending the pre-stage bias control signal to the pre-stage bias amplifying circuit;
the pre-stage bias amplifying circuit is used for amplifying according to the pre-stage bias control signal to obtain a pre-stage bias voltage, and sending the pre-stage bias voltage to the post-stage bias amplifying circuit;
the back-stage bias amplifying circuit is used for amplifying according to the sampling voltage and the front-stage bias voltage to obtain a target feedback voltage, and sending the target feedback voltage to the voltage stabilizing circuit;
the voltage stabilizing circuit is also used for adjusting the original output voltage according to the target feedback voltage to obtain a target output voltage.
2. The output controllable DC-DC conversion device according to claim 1, wherein the pre-stage bias amplifying circuit includes a first operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor;
the positive power input pin of the first operational amplifier is electrically connected with a +5V power end, the negative power input pin of the first operational amplifier is electrically connected with a-5V power end, the positive input pin of the first operational amplifier is electrically connected with the output end of the control circuit through the first resistor, and the positive input pin of the first operational amplifier is also electrically connected with the reference power end through the second resistor; the inverting input pin of the first operational amplifier is grounded through the fourth resistor, the first end of the third resistor is connected to the common connection end between the non-inverting input pin of the first operational amplifier and the first resistor, and the second end of the third resistor is grounded; the inverting input pin of the first operational amplifier is also electrically connected with the output pin of the first operational amplifier through the fifth resistor, and the output pin of the first operational amplifier is also electrically connected with the input end of the rear-stage bias amplifying circuit.
3. The output controllable DC-DC conversion device according to claim 1, wherein the sampling circuit includes a sixth resistor, a seventh resistor, an eighth resistor, and a first capacitor;
the first end of the eighth resistor is electrically connected with the output end of the output feedback circuit, the second end of the eighth resistor is electrically connected with the input end of the control circuit, the first end of the eighth resistor is also electrically connected with the input end of the post-stage bias amplifying circuit through the sixth resistor, the first end of the first capacitor is connected to a common connection end between the second end of the eighth resistor and the input end of the control circuit, the second end of the first capacitor is grounded, and the second end of the first capacitor is also electrically connected with the input end of the post-stage bias amplifying circuit through the seventh resistor.
4. A DC-DC conversion apparatus according to claim 3, wherein the post-stage bias amplifying circuit includes a second operational amplifier, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a second capacitor, and a third capacitor;
the power input pin of the second operational amplifier is electrically connected with the circuit power supply end VCC, and the grounding pin of the second operational amplifier is grounded; the positive input pin of the second operational amplifier is electrically connected with the output end of the front-stage bias amplifying circuit through the ninth resistor, the positive input pin of the second operational amplifier is also grounded through the tenth resistor, the first end of the second capacitor is connected to the common connection end between the ninth resistor and the output end of the front-stage bias amplifying circuit, the second end of the second capacitor is grounded, and the positive input pin of the second operational amplifier is also electrically connected with the first end of the sixth resistor; the inverting input pin of the second operational amplifier is electrically connected with the first end of the seventh resistor, the inverting input pin of the second operational amplifier is also electrically connected with the output pin of the second operational amplifier through the eleventh resistor, the output pin of the second operational amplifier is electrically connected with the input end of the voltage stabilizing circuit through the twelfth resistor, the first end of the third capacitor is connected to the common connection end between the twelfth resistor and the input end of the voltage stabilizing circuit, and the second end of the third capacitor is grounded.
5. The output controllable DC-DC converter of claim 1 wherein the voltage regulator circuit comprises a voltage regulator chip, a thirteenth resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, an inductor, and a diode;
the power input pin VIN and the enable pin EN of the voltage stabilizing chip are electrically connected with the input power supply, the first end of the fourth capacitor and the first end of the fifth capacitor are connected to a common connection end between the power input pin VIN of the voltage stabilizing chip and the input power supply, and the second end of the fourth capacitor and the second end of the fifth capacitor are grounded; the multifunctional control pin RT/SYNC of the voltage stabilizing chip is grounded through the thirteenth resistor; the ground pin GND and the ground potential pin EPAD of the voltage stabilizing chip are both grounded, the sampling pin SS of the voltage stabilizing chip is grounded through the seventh capacitor, and the input feedback pin FB of the voltage stabilizing chip is electrically connected with the output end of the rear-stage bias amplifying circuit; the switch pin BOOT of steady voltage chip pass through sixth electric capacity with steady voltage chip's output pin SW electricity is connected, steady voltage chip's output pin SW still passes through the inductance respectively with output feedback circuit's input and external equipment electricity are connected, the negative pole of diode is connected steady voltage chip's output pin with on the common link between the inductance, the positive pole ground connection of diode, eighth electric capacity's first end with ninth electric capacity's first end is all connected on the common link between inductance with output feedback circuit's input, eighth electric capacity's second end with ninth electric capacity's second end is all grounded.
6. The output controllable DC-DC conversion device according to claim 5, wherein the output feedback circuit includes a fourteenth resistor and a fifteenth resistor;
the first end of the fourteenth resistor is connected to a common connection end between the inductor and the external equipment, the second end of the fourteenth resistor is grounded through the fifteenth resistor, and the input end of the sampling circuit is connected to the common connection end between the second end of the fourteenth resistor and the fifteenth resistor.
7. The output controllable DC-DC conversion device according to claim 1, wherein the device further comprises a follower circuit;
the input end of the follower circuit is electrically connected with the output end of the output feedback circuit, and the output end of the follower circuit is electrically connected with the input end of the sampling circuit;
the follower circuit is configured to send the original feedback voltage output by the output feedback circuit to the sampling circuit, and prevent the target feedback voltage in the post-stage bias amplifying circuit from returning to the output feedback circuit through the sampling circuit.
8. The output controllable DC-DC conversion device of claim 7, wherein the follower circuit comprises a third op-amp;
The power input pin of the third operational amplifier is electrically connected with the circuit power supply end VCC, the grounding pin of the third operational amplifier is grounded, the normal phase input pin of the third operational amplifier is electrically connected with the output end of the output feedback circuit, the reverse phase input pin of the third operational amplifier is electrically connected with the output pin of the third operational amplifier, and the output pin of the third operational amplifier is also electrically connected with the input end of the sampling circuit.
9. The output controllable DC-DC conversion device according to any one of claims 1 to 8, wherein the control circuit comprises a single chip microcomputer having an analog-to-digital conversion pin and a digital-to-analog conversion pin;
the output end of the sampling circuit is electrically connected with the analog-to-digital conversion pin of the singlechip, and the digital-to-analog conversion pin of the singlechip is electrically connected with the input end of the front-stage bias amplifying circuit;
the singlechip is used for accessing the sampling voltage acquired by the sampling circuit through the analog-to-digital conversion pin and performing analog-to-digital conversion on the sampling voltage to obtain a digital voltage signal; and the digital-to-analog conversion pin is used for generating a digital control signal according to the digital voltage signal, carrying out digital-to-analog conversion on the digital control signal to obtain an analog front-stage bias control signal, and sending the analog front-stage bias control signal to the front-stage bias amplifying circuit.
10. A control method of an output-controllable DC-DC conversion device, characterized by outputting a target output voltage using the output-controllable DC-DC conversion device according to any one of claims 1 to 9, the method comprising:
the voltage stabilizing circuit is used for stabilizing and converting the input voltage output by the input power supply to obtain an original output voltage;
the original output voltage is obtained by utilizing an output feedback circuit, and the original feedback voltage is obtained according to the original output voltage;
collecting the original feedback voltage by using a sampling circuit to obtain a sampling voltage;
generating a pre-stage bias control signal according to the sampling voltage by using a control circuit, and amplifying by using a pre-stage bias amplifying circuit according to the pre-stage bias control signal to obtain a pre-stage bias voltage;
the sampling voltage and the front-stage bias voltage are respectively obtained by a rear-stage bias amplifying circuit, and the target feedback voltage is obtained by amplifying according to the sampling voltage and the front-stage bias voltage;
and regulating the original output voltage by using the voltage stabilizing circuit according to the target feedback voltage to obtain the target output voltage.
CN202310605322.8A 2023-05-26 2023-05-26 DC-DC conversion device capable of controlling output and control method thereof Pending CN116633128A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310605322.8A CN116633128A (en) 2023-05-26 2023-05-26 DC-DC conversion device capable of controlling output and control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310605322.8A CN116633128A (en) 2023-05-26 2023-05-26 DC-DC conversion device capable of controlling output and control method thereof

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CN116633128A true CN116633128A (en) 2023-08-22

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