CN109586578B - Self-adaptive power supply control circuit, SEPIC type switching power supply and control method thereof - Google Patents
Self-adaptive power supply control circuit, SEPIC type switching power supply and control method thereof Download PDFInfo
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- CN109586578B CN109586578B CN201811455111.6A CN201811455111A CN109586578B CN 109586578 B CN109586578 B CN 109586578B CN 201811455111 A CN201811455111 A CN 201811455111A CN 109586578 B CN109586578 B CN 109586578B
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- 239000003990 capacitor Substances 0.000 claims abstract description 65
- 230000003321 amplification Effects 0.000 claims abstract description 20
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 20
- 230000003044 adaptive effect Effects 0.000 claims description 21
- 230000005669 field effect Effects 0.000 claims description 20
- 230000001629 suppression Effects 0.000 abstract description 3
- 238000005070 sampling Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
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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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33515—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 with automatic control of the output voltage or current, e.g. flyback converters with digital control
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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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—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 with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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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
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC 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
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC 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
- H02M3/1557—Single ended primary inductor converters [SEPIC]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a self-adaptive power control circuit, which comprises: a feedback loop and a logic control circuit; the feedback loop comprises a first error amplification loop and a second error amplification loop, the first error amplification loop comprises a diode V3, a capacitor C4, a capacitor C5, a resistor R1 and an operational amplifier U1, and the second error amplification loop comprises a diode V4, a capacitor C6, a capacitor C7, a resistor R2 and an operational amplifier U2; according to the scheme, the first error amplification loop and the second error amplification loop are designed in the feedback loop of the switching power supply to form different zero and pole values and different crossing frequencies, namely different frequency bandwidths, and the suppression capability of the switching power supply on the response of a dynamic load is improved.
Description
Technical Field
The invention relates to the technical field of control circuits, in particular to a self-adaptive power supply control circuit, an SEPIC type switching power supply and a control method thereof.
Background
A self-adaptive power supply control circuit for the working voltage of a radio-frequency power amplifier is used for adjusting the working power supply voltage of a power amplifying tube so as to adjust the power capacity of the power amplifying tube, realize that the radio-frequency power amplifier is compatible with different radio-frequency modes and different waveforms, and obtain high efficiency.
The stability of the switching power supply is mainly determined by the phase margin, gain margin and frequency bandwidth of the feedback loop. The feedback loop is mainly an error amplifier composed of a resistor R, a capacitor C and an operational amplifier circuit, the conventional switching power supply feedback loop usually only adopts a single error amplifier, once R, C parameters are confirmed, the zero point and pole values are also fixed, and the phase margin, the gain margin, the frequency bandwidth and the like cannot be changed along with the load change, so that the load has limitation.
Therefore, different feedback loops are urgently needed to be designed in the industry to form different zero points, pole values and different crossing frequencies so as to improve the suppression capability of the switching power supply on the response of the dynamic load.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a self-adaptive power supply control circuit.
It is another object of the present invention to overcome the above deficiencies of the prior art by providing a SEPIC-type switching power supply including an adaptive power supply control circuit.
It is another object of the present invention to overcome the above disadvantages of the prior art and to provide a control method for an adaptive power control circuit.
The purpose of the invention is realized by the following technical scheme:
an adaptive power control circuit comprising: a feedback loop and a logic control circuit; the feedback loop comprises a first error amplification loop and a second error amplification loop, the first error amplification loop comprises a diode V3, a capacitor C4, a capacitor C5, a resistor R1 and an operational amplifier U1, and the second error amplification loop comprises a diode V4, a capacitor C6, a capacitor C7, a resistor R2 and an operational amplifier U2; the anode of the diode V3 is connected with the VFB signal end of the PWM control chip, the cathode of the diode V3 is connected with one end of a capacitor C4, one end of a capacitor C5 and the output end of an operational amplifier U1, the other end of the capacitor C5 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with the other end of the capacitor C4 and the inverting input end of an operational amplifier U1, the inverting input end of the operational amplifier U1 is further connected with the first output end of the logic control circuit, the anode of the diode V4 is connected with the VFB signal end of the PWM control chip, the cathode of the diode V4 is connected with one end of a capacitor C6, one end of a capacitor C7 and the output end of the operational amplifier U2, the other end of the capacitor C6 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with the other end of a capacitor C7 and the inverting input end of an operational amplifier U2, the inverting input end of the operational amplifier U2 is further connected with, and the non-inverting terminal of the operational amplifier U2 and the non-inverting terminal of the operational amplifier U1 are both connected with the VREF signal end of the PWM control chip.
Preferably, the logic control circuit includes: an electronic switch V5, an electronic switch V6, an operational amplifier U3, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9 and a resistor R10; the electronic switch V5 and the electronic switch V6 are single-pole double-throw switches; a first fixed end of the electronic switch V5 is connected with an inverting input end of an operational amplifier U1, a second fixed end of the electronic switch V5 is connected with an inverting input end of the operational amplifier U2, a CTL end of the electronic switch V5 is connected with a SET signal end of an external MCU, a movable end of the electronic switch V5 is connected with a movable end of an electronic switch V6, one end of a resistor R7 and an output end of the operational amplifier U3, a CTL end of the electronic switch V6 is connected with a SET signal end of the external MCU, a first fixed end of the electronic switch V6 is connected with one end of a resistor R4 and one end of a resistor R6, the other end of the resistor R6 is connected with the ground, the other end of the resistor R4 is connected with an output positive Vo end, a second fixed end of the electronic switch V6 is connected with one end of a resistor R3 and one end of a resistor R5, the other end of the resistor R5 is connected with the ground, and the other end of the resistor R3 is connected with an output positive Vo end, the inverting input end of the operational amplifier U3 is connected with the other end of the resistor R7 and one end of the resistor R10, the other end of the resistor R10 is connected to the ground, the non-inverting input end of the operational amplifier U3 is connected with one end of the resistor R9 and one end of the resistor R8, the other end of the resistor R9 is connected to the ground, and the other end of the resistor R8 is connected with an ADJ signal end of an external MCU.
The other purpose of the invention is realized by the following technical scheme:
a SEPIC-type switching power supply including an adaptive power supply control circuit, comprising: an input power Vin, a capacitor C1, a transformer T1, a capacitor C2, an N-channel field effect transistor V1, a Schottky diode V2, a capacitor C3, a PWM control chip and an adaptive power control circuit, wherein the adaptive power control circuit comprises the feedback loop of any one of claims 1 to 3 and the logic control circuit of any one of claims 1 to 3; the signal input end of the logic control circuit is connected with the output positive electrode Vo end, the control end of the logic control circuit is connected with the ADJ signal end of the external MCU and the SET signal end of the external MCU, the output end of the logic control circuit is connected with the input end of the feedback loop, the output end of the feedback loop is connected with the PWM control chip, the output end of the PWM control chip is connected with the grid G of the N-channel field effect transistor V1, the source S of the N-channel field effect transistor V1 is connected to the ground, the drain D of the N-channel field effect transistor V1 is connected with one end of the primary coil of the transformer T1 and one end of the capacitor C2, the input positive electrode end of the input power Vin is connected with one end of the capacitor C1 and the other end of the primary coil of the transformer T1, the negative electrode end of the input power supply V1 is connected with the ground, one end of the secondary coil of the transformer T1 is connected with the other end of the capacitor C, The anodes of the Schottky diodes V2 are connected, the cathode of the Schottky diode V2, the output anode Vo end and one end of the capacitor C3 are connected, and the other end of the secondary coil of the transformer T1 and the other end of the capacitor C3 are connected to the ground.
The other purpose of the invention is realized by the following technical scheme:
a control method of a self-adaptive power supply control circuit comprises the following steps that if a SET signal end of an external MCU controls a VSET signal to be in a high level:
the movable end and the first fixed end of the electronic switch V5 are connected, and the movable end and the first fixed end of the electronic switch V6 are connected;
a resistor R4 and a resistor R6 output a sampling signal VSAM1 obtained by voltage division from the positive electrode Vo end;
the sampling signal VSAM1 is transmitted to the inverting input end of the U1 end of the operational amplifier through the electronic switch V6 and the electronic switch V5, and a VFB1 signal is obtained;
the voltage value of the VFB1 signal is adjusted by an analog adjusting signal ADJ at an ADJ signal end of the external MCU;
the VFB1 signal is processed by an operational amplifier U1 to obtain a feedback signal VFB;
the feedback signal VFB enters a PWM control chip to control the switching state of an N-channel field effect transistor V1 in the SEPIC type switching power supply, and the SEPIC type switching power supply outputs low-waveband voltage.
A control method of a self-adaptive power supply control circuit comprises the following steps if a SET signal end of an external MCU controls a VSET signal to be at a low level:
the movable end and the second fixed end of the electronic switch V5 are connected, and the movable end and the second fixed end of the electronic switch V6 are connected;
a resistor R3 and a resistor R4 output a sampling signal VSAM2 obtained by voltage division from the positive electrode Vo end;
the sampling signal VSAM2 is transmitted to the inverting input end of the U2 end of the operational amplifier through the electronic switch V6 and the electronic switch V5, and a VFB2 signal is obtained;
the voltage value of the VFB2 signal is adjusted by an analog adjusting signal ADJ at an ADJ signal end of the external MCU;
the VFB2 signal is processed by an operational amplifier U2 to obtain a feedback signal VFB;
the feedback signal VFB enters a PWM control chip to control the switching state of an N-channel field effect transistor V1 in the SEPIC type switching power supply, and the SEPIC type switching power supply outputs high-waveband voltage.
Compared with the prior art, the invention has the following advantages:
according to the scheme, the first error amplification loop and the second error amplification loop are designed in the feedback loop of the switching power supply to form different zero and pole values and different crossing frequencies, namely different frequency bandwidths, and the suppression capability of the switching power supply on the response of a dynamic load is improved. Specifically, a level control signal SET at an SET end of an external MCU is adopted to control a single-pole double-throw electronic switch, so that the response speed of a corresponding feedback loop is selected for a PWM control chip in a self-adaptive manner, ripples are effectively reduced or eliminated, and the stability of output voltage is improved; and the divided voltage sampling values VSAM1 and VSAM2 are adjusted according to the analog adjusting signal ADJ of the external MCU, so that constant-power and sectional voltage output is realized, the SEPIC type switching power supply with continuously adjustable voltage of 4-48V meets the requirement of the power supply voltage of the power amplifier tube workpiece.
Drawings
Fig. 1 is a circuit diagram of an adaptive power control circuit of the present invention.
Fig. 2 is a circuit diagram of a SEPIC-type switching power supply of the present invention including an adaptive power supply control circuit.
Fig. 3 is a schematic flow chart of a control method of the adaptive power control circuit of the present invention.
Fig. 4 is another schematic flow chart of a control method of the adaptive power control circuit of the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples.
Referring to fig. 1, an adaptive power control circuit includes: a feedback loop and a logic control circuit; the feedback loop comprises a first error amplification loop and a second error amplification loop, the first error amplification loop comprises a diode V3, a capacitor C4, a capacitor C5, a resistor R1 and an operational amplifier U1, and the second error amplification loop comprises a diode V4, a capacitor C6, a capacitor C7, a resistor R2 and an operational amplifier U2; the anode of the diode V3 is connected with the VFB signal end of the PWM control chip, the cathode of the diode V3 is connected with one end of a capacitor C4, one end of a capacitor C5 and the output end of an operational amplifier U1, the other end of the capacitor C5 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with the other end of the capacitor C4 and the inverting input end of an operational amplifier U1, the inverting input end of the operational amplifier U1 is further connected with the first output end of the logic control circuit, the anode of the diode V4 is connected with the VFB signal end of the PWM control chip, the cathode of the diode V4 is connected with one end of a capacitor C6, one end of a capacitor C7 and the output end of the operational amplifier U2, the other end of the capacitor C6 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with the other end of a capacitor C7 and the inverting input end of an operational amplifier U2, the inverting input end of the operational amplifier U2 is further connected with, and the non-inverting terminal of the operational amplifier U2 and the non-inverting terminal of the operational amplifier U1 are both connected with the VREF signal end of the PWM control chip.
In this embodiment, the logic control circuit includes: an electronic switch V5, an electronic switch V6, an operational amplifier U3, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9 and a resistor R10; the electronic switch V5 and the electronic switch V6 are single-pole double-throw switches; the first fixed end (end B) of the electronic switch V5 is connected with the inverting input end of the operational amplifier U1, the second fixed end (end C) of the electronic switch V5 is connected with the inverting input end of the operational amplifier U2, the CTL end of the electronic switch V5 is connected with the SET signal end of the external MCU, the movable end (end A) of the electronic switch V5 is connected with the movable end (end A) of the electronic switch V6, one end of the resistor R7 and the output end of the operational amplifier U3, the CTL end of the electronic switch V6 is connected with the SET signal end of the external MCU, the first fixed end (end B) of the electronic switch V6 is connected with one end of the resistor R4 and one end of the resistor R6, the other end of the resistor R6 is connected with the ground, the other end of the resistor R4 is connected with the positive Vo end of the connection output, the second fixed end (end C) of the electronic switch V6 is connected with one end of the resistor R3 and one end of the resistor R5, the other end of the resistor R5 is connected to the ground, the other end of the resistor R3 is connected with the end of the output positive pole Vo, the inverting input end of the operational amplifier U3 is connected with the other end of the resistor R7 and one end of the resistor R10, the other end of the resistor R10 is connected to the ground, the non-inverting input end of the operational amplifier U3 is connected with one end of the resistor R9 and one end of the resistor R8, the other end of the resistor R9 is connected to the ground, and the other end of the resistor R8 is connected with the ADJ signal end of the external MCU.
Referring to fig. 2, a SEPIC-type switching power supply including an adaptive power supply control circuit includes: the self-adaptive power supply control circuit comprises an input power Vin, a capacitor C1, a transformer T1, a capacitor C2, an N-channel field effect transistor V1, a Schottky diode V2, a capacitor C3, a PWM control chip and an adaptive power supply control circuit, wherein the adaptive power supply control circuit comprises the feedback loop and the logic control circuit; the signal input end of the logic control circuit is connected with the output positive electrode Vo end, the control end of the logic control circuit is connected with the ADJ signal end of the external MCU and the SET signal end of the external MCU, the output end of the logic control circuit is connected with the input end of the feedback loop, the output end of the feedback loop is connected with the PWM control chip, the output end of the PWM control chip is connected with the grid G of the N-channel field effect transistor V1, the source S of the N-channel field effect transistor V1 is connected to the ground, the drain D of the N-channel field effect transistor V1 is connected with one end of the primary coil of the transformer T1 and one end of the capacitor C2, the input positive end of the input power Vin is connected with one end of the capacitor C1 and the other end of the primary coil of the transformer T1, the negative end of the input power supply V1 is connected with the ground, one end of the secondary coil of the transformer T1 is connected with the other end of the capacitor C36, The anodes of the Schottky diodes V2 are connected, the cathode of the Schottky diode V2, the output anode Vo end and one end of the capacitor C3 are connected, and the other end of the secondary coil of the transformer T1 and the other end of the capacitor C3 are connected to the ground. The input power Vin is 9V-36V.
Referring to fig. 3, if the SET signal terminal of the external MCU controls the VSET signal to be at a high level, the method for controlling the adaptive power control circuit includes:
s11, the movable end and the first fixed end of the electronic switch V5 are connected, and the movable end and the first fixed end of the electronic switch V6 are connected;
s12, a resistor R4 and a resistor R6 output a sampling signal VSAM1 obtained by voltage division from the positive electrode Vo end;
s13, the sampling signal VSAM1 is transmitted to the inverting input end of the U4 end of the operational amplifier through the electronic switch V6 and the electronic switch V5, and a VFB1 signal is obtained;
s14, adjusting the voltage value of the VFB1 signal by an analog adjusting signal ADJ at the ADJ signal end of the external MCU;
s15, the VFB1 signal is processed by an operational amplifier U1 to obtain a feedback signal VFB;
s16, the feedback signal VFB enters the PWM control chip to control the switch state of the N-channel field effect transistor V1 in the SEPIC type switch power supply, and the SEPIC type switch power supply outputs low-waveband voltage and is continuously adjustable within 4V-30V. The PWM control chip outputs a VGS signal to a grid G of an N-channel field effect transistor V1 so as to control the switching state of an N-channel field effect transistor V1 in the SEPIC type switching power supply.
Referring to fig. 4, if the SET signal terminal of the external MCU controls the VSET signal to be at a low level, the method for controlling the adaptive power control circuit includes:
s21, the movable end and the second fixed end of the electronic switch V5 are connected, and the movable end and the second fixed end of the electronic switch V6 are connected;
s22, a resistor R3 and a resistor R4 output a sampling signal VSAM2 obtained by voltage division from the positive electrode Vo end;
s23, the sampling signal VSAM2 is transmitted to the inverting input end of the U2 end of the operational amplifier through the electronic switch V6 and the electronic switch V5, and a VFB2 signal is obtained;
s24, adjusting the voltage value of the VFB2 signal by an analog adjusting signal ADJ at the ADJ signal end of the external MCU;
s25, the VFB2 signal is processed by an operational amplifier U2 to obtain a feedback signal VFB;
s26, the feedback signal VFB enters the PWM control chip to control the switch state of the N-channel field effect transistor V1 in the SEPIC type switch power supply, and the SEPIC type switch power supply outputs high-band voltage and is continuously adjustable within 20V-48V. The PWM control chip outputs a VGS signal to a grid G of an N-channel field effect transistor V1 so as to control the switching state of an N-channel field effect transistor V1 in the SEPIC type switching power supply.
The above-mentioned embodiments are preferred embodiments of the present invention, and the present invention is not limited thereto, and any other modifications or equivalent substitutions that do not depart from the technical spirit of the present invention are included in the scope of the present invention.
Claims (2)
1. An adaptive power control circuit, comprising: a feedback loop and a logic control circuit; the feedback loop comprises a first error amplification loop and a second error amplification loop, the first error amplification loop comprises a diode V3, a capacitor C4, a capacitor C5, a resistor R1 and an operational amplifier U1, and the second error amplification loop comprises a diode V4, a capacitor C6, a capacitor C7, a resistor R2 and an operational amplifier U2;
the anode of the diode V3 is connected with the VFB signal end of the PWM control chip, the cathode of the diode V3 is connected with one end of a capacitor C4, one end of a capacitor C5 and the output end of an operational amplifier U1, the other end of the capacitor C5 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with the other end of the capacitor C4 and the inverting input end of an operational amplifier U1, the inverting input end of the operational amplifier U1 is further connected with the first output end of the logic control circuit, the anode of the diode V4 is connected with the VFB signal end of the PWM control chip, the cathode of the diode V4 is connected with one end of a capacitor C6, one end of a capacitor C7 and the output end of the operational amplifier U2, the other end of the capacitor C6 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with the other end of a capacitor C7 and the inverting input end of an operational amplifier U2, the inverting input end of the operational amplifier U2 is further connected with, the non-inverting input end of the operational amplifier U2 and the non-inverting input end of the operational amplifier U1 are both connected with a VREF signal end of the PWM control chip;
the logic control circuit includes: an electronic switch V5, an electronic switch V6, an operational amplifier U3, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9 and a resistor R10; the electronic switch V5 and the electronic switch V6 are both single-pole double-throw switches;
a first fixed end of the electronic switch V5 is connected with an inverting input end of an operational amplifier U1, a second fixed end of the electronic switch V5 is connected with an inverting input end of the operational amplifier U2, a CTL end of the electronic switch V5 is connected with a SET signal end of an external MCU, a movable end of the electronic switch V5 is connected with a movable end of an electronic switch V6, one end of a resistor R7 and an output end of the operational amplifier U3, a CTL end of the electronic switch V6 is connected with a SET signal end of the external MCU, a first fixed end of the electronic switch V6 is connected with one end of a resistor R4 and one end of a resistor R6, the other end of the resistor R6 is connected with the ground, the other end of the resistor R4 is connected with an output positive Vo end, a second fixed end of the electronic switch V6 is connected with one end of a resistor R3 and one end of a resistor R5, the other end of the resistor R5 is connected with the ground, and the other end of the resistor R3 is connected with an output positive Vo end, the inverting input end of the operational amplifier U3 is connected with the other end of the resistor R7 and one end of the resistor R10, the other end of the resistor R10 is connected to the ground, the non-inverting input end of the operational amplifier U3 is connected with one end of the resistor R9 and one end of the resistor R8, the other end of the resistor R9 is connected to the ground, and the other end of the resistor R8 is connected with an ADJ signal end of an external MCU.
2. A SEPIC-type switching power supply including an adaptive power supply control circuit, comprising: the self-adaptive power supply control circuit comprises an input power Vin, a capacitor C1, a transformer T1, a capacitor C2, an N-channel field effect transistor V1, a Schottky diode V2, a capacitor C3, a PWM control chip and an adaptive power supply control circuit, wherein the adaptive power supply control circuit is the adaptive power supply control circuit of claim 1;
the signal input end of the logic control circuit is connected with the output positive electrode Vo end, the control end of the logic control circuit is connected with the ADJ signal end of the external MCU and the SET signal end of the external MCU, the output end of the logic control circuit is connected with the input end of the feedback loop, the output end of the feedback loop is connected with the PWM control chip, the output end of the PWM control chip is connected with the grid G of the N-channel field effect transistor V1, the source S of the N-channel field effect transistor V1 is connected to the ground, the drain D of the N-channel field effect transistor V1 is connected with one end of the primary coil of the transformer T1 and one end of the capacitor C2, the input positive end of the input power Vin is connected with one end of the capacitor C1 and the other end of the primary coil of the transformer T1, the negative end of the input power supply V1 is connected with the ground, one end of the secondary coil of the transformer T1 is connected with the other end of the capacitor C36, The anodes of the Schottky diodes V2 are connected, the cathode of the Schottky diode V2, the output anode Vo end and one end of the capacitor C3 are connected, and the other end of the secondary coil of the transformer T1 and the other end of the capacitor C3 are connected to the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811455111.6A CN109586578B (en) | 2018-11-30 | 2018-11-30 | Self-adaptive power supply control circuit, SEPIC type switching power supply and control method thereof |
Applications Claiming Priority (1)
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