CN107276400B - Buck-Boost application circuit - Google Patents

Buck-Boost application circuit Download PDF

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Publication number
CN107276400B
CN107276400B CN201710686886.3A CN201710686886A CN107276400B CN 107276400 B CN107276400 B CN 107276400B CN 201710686886 A CN201710686886 A CN 201710686886A CN 107276400 B CN107276400 B CN 107276400B
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resistor
pin
capacitor
twenty
diode
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CN107276400A (en
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王松长
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Hunan Hongwei Electronic Technology Co ltd
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Hunan Hongwei Electronic Technology Co ltd
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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
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
    • 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
    • H02M1/36—Means for starting or stopping 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
    • 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
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
    • H02M3/072—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps adapted to generate an output voltage whose value is lower than the input voltage

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Rectifiers (AREA)

Abstract

The invention provides a Buck-Boost application circuit which comprises a MOS tube Q1, a diode D2, an inductor L2 and capacitors EC1 and EC2, wherein the capacitors EC1 and EC2 form a Buck topological structure; the automatic conversion of the Buck-Boost is identified by detecting the input and output voltages, and the voltage of the input (Va) and the output (Vb) is compared by a comparator U3, and then the main chips U1 and U2 are controlled respectively, so that the circuit operates in a working mode.

Description

Buck-Boost application circuit
Technical Field
The invention relates to the technical field of circuits, in particular to a Buck-Boost application circuit.
Background
The Buck/Boost converter is also called as Buck-Boost converter, and is a single-tube non-isolated direct-current converter with output voltage which can be lower than or higher than input voltage, but the polarity of the output voltage is opposite to that of the input voltage. The existing Buck/Boost converter is complex in circuit and general in conversion effect.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the Buck-Boost application circuit which can be automatically converted and has high use efficiency.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows: the Buck-Boost application circuit comprises a first control main chip, a first MOS tube, a second MOS tube, a first diode, a second diode and a third diode, wherein a power zero line is connected with one end of the first diode and one end of a first electrolytic capacitor and then grounded, a power live wire is connected with one end of the first diode and the other end of the first electrolytic capacitor and then respectively connected with a 7 th pin, a fifth capacitor, a third triode collector, a first resistor and a source electrode of the first MOS tube of the first control main chip, the other end of the first resistor is connected with a base electrode of the third triode and then respectively connected with a D pin, a sixth diode and one end of the fifth MOS tube, an emitter of the third triode is connected with one end of the fourth triode and then connected with the first MOS tube, a G pin of the fifth MOS tube is connected with one end of the seventh resistor and then connected with one end of the sixth resistor, and the other end of the seventh resistor is connected with an S pin of the fifth MOS tube and then grounded; the other end of the sixth resistor is connected with the 6 th pin of the first control main chip, the 8 th pin of the first control main chip is connected with one end of the fifth resistor and then connected with the collector of the sixth triode, the base electrode of the sixth triode is connected with the other end of the fifth resistor and then connected with the 4 th pin of the first control main chip and one end of the fourth capacitor, the emitter of the sixth triode is connected with one end of the third resistor, the other end of the third resistor is connected with the fourth resistor, the third capacitor and the 3 rd pin of the first control main chip respectively, the 1 st pin of the first control main chip is connected with one end of the first capacitor, the second capacitor, the eighth diode and the ninth diode respectively, the other end of the first capacitor is connected with one end of the second resistor, the other end of the second resistor is connected with the other end of the second capacitor and the 2 nd pin of the first control main chip respectively, the other end of the third capacitor is grounded after the second resistor is connected with the third capacitor, and the other end of the third capacitor is connected with the other end of the fourth capacitor; the other end of the fourth resistor is connected with one end of the ninth resistor and then connected with one end of the tenth resistor, the other end of the tenth resistor is grounded, the other end of the ninth resistor is connected with one end of a fourth diode, the other end of the fourth diode is connected with one end of the eighth resistor and then connected with the 3 rd pin of the first inductor, the first MOS tube is connected with the 1 st pin of the first inductor, the other end of the eighth resistor is connected with the 4 th pin of the first inductor and then grounded, the 2 nd pin of the first inductor is connected with one end of the second inductor after being connected with the second diode, the other end of the second inductor is respectively connected with the 1 st pin of the second MOS tube and one end of the third diode, the other end of the third diode is connected with one end of the second electrolytic capacitor and then outputs a live wire, the other end of the second electrolytic capacitor outputs a zero wire, the 2 nd pin of the second MOS tube is sequentially connected with the seventeenth resistor and the thirteenth diode emitter and then connected with one end of the sixteenth resistor, the other end of the sixteenth resistor is respectively connected with the base electrode of the thirteenth transistor and one end of the fifteenth resistor, the collector electrode of the tenth triode is respectively connected with the 3 rd pin of the second MOS transistor and the 1 st pin of the third inductor after being connected with the other end of the seventeenth resistor, the 2 nd pin of the third inductor is connected with the 4 th pin of the third inductor and grounded, the 3 rd pin of the third inductor is connected with one end of the twentieth resistor and is connected with one end of the fifth diode, the other end of the fifth diode is connected with one end of the eighteenth resistor, the other end of the eighteenth resistor is respectively connected with one end of the nineteenth resistor and the other end of the thirteenth resistor is grounded, the other end of the thirteenth resistor is respectively connected with the 3 rd pin of the second control main chip and one end of the eighth capacitor after being connected with one end of the twelfth resistor and the emitter of the seventh triode, the collector of the seventh triode is respectively connected with one end of a fourteenth resistor and one end of an 8 th pin of a second control main chip, the other end of the fourteenth resistor is respectively connected with one end of a 4 th pin and one end of a ninth capacitor of the second control main chip after being connected with the base of the seventh triode, the other end of the ninth capacitor is connected with one end of an eighth capacitor and then grounded, the grounding end is respectively connected with one end of a 2 nd pin, the seventh capacitor and one end of an eleventh resistor of the second control main chip, the other end of the eleventh resistor is connected with one end of a sixth capacitor, the other end of the sixth capacitor is respectively connected with one end of a 1 st pin, a seventh diode and one end of a twelfth diode of the second control main chip after being connected with the other end of the eighth diode, the other end of the seventh diode is respectively connected with one end of a twenty-first resistor, a twenty-second resistor, a twenty-third resistor and a twenty-fourth resistor, the other ends of the twenty-first resistor and the twenty-second resistor are connected with one end of a Vb pin after being interconnected, and the other ends of the twenty-third resistor and the twenty-fourth resistor are connected with one end of the twenty-fourth resistor and then grounded; the other end of the sixth diode is connected with the other end of the ninth diode and then is connected with the 1 st pin of the ninth MOS tube, the 3 rd pin of the ninth MOS tube is respectively connected with one end of the first voltage stabilizing tube, one end of the eighth triode emitter and one end of the thirty-second resistor and then is grounded, the 2 nd pin of the ninth MOS tube is respectively connected with one end of the twelfth diode, one end of the eighth triode collector and one end of the thirty-first resistor after being connected with the other end of the thirty-second resistor, the other end of the thirty-first resistor is respectively connected with the 1 st pin of the comparator, the other end of the thirty-first resistor is respectively connected with the fourteenth capacitor, one end of the 8 th pin of the eleventh diode and one end of the twelfth diode of the comparator, the other end of the fourteenth capacitor is grounded, the other end of the eleventh diode is respectively connected with one end of the Vb pin and one end of the twenty-fifth resistor, the other end of the twenty-fifth resistor is respectively connected with one end of the 2 nd pin of the comparator and one end of the eleventh capacitor, the other end of the eleventh capacitor is sequentially connected with one end of the twenty-seventh resistor, the twenty-eighth resistor and one end of the twenty-eighth capacitor are connected with the thirteenth capacitor and one end of the twenty-eighth capacitor and the twenty-eighth capacitor are sequentially; the other end of the twelfth diode is connected with the Va pin and one end of a twenty-sixth resistor respectively, and the other end of the twenty-sixth resistor is connected with the twenty-eighth resistor and the other end of the twelfth capacitor in sequence and then connected with the 3 rd pin of the comparator.
The Buck-Boost after the proposal is adopted can be automatically changed, and the service efficiency is high.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the present invention.
Detailed Description
The invention is further described below with reference to all drawings, in which preferred embodiments of the invention are: referring to fig. 1, the Buck-Boost application circuit in this embodiment includes a first control main chip U1, a first MOS transistor Q1, a second MOS transistor Q2, a first diode D1, a second diode D2, and a third diode D3, where a power zero line is connected to one end of the first diode D1 and one end of the first electrolytic capacitor EC1 and then grounded, a power live wire is connected to the other end of the first diode D1 and one end of the first electrolytic capacitor EC1 and then connected to a 7 th pin of the first control main chip U1, a fifth capacitor C5, a collector of the third triode Q3, a first resistor R1, and a source of the first MOS transistor Q1, the other end of the first resistor R1 is connected to a base of the third triode Q3 and then connected to a D pin of the fifth MOS transistor Q5, a sixth diode D6 and one end of the fourth triode Q4, an emitter of the third triode Q3 is connected to the first MOS transistor Q1 and then connected to the other end of the fifth transistor Q5, and then connected to a seventh resistor Q7 and then connected to one end of the seventh resistor Q7; the other end of the sixth resistor R6 is connected with the 6 th pin of the first control main chip U1, the 8 th pin of the first control main chip U1 is connected with one end of the fifth resistor R5 and then is connected with the collector of the sixth triode Q6, the base electrode of the sixth triode Q6 is connected with the other end of the fifth resistor R5 and then is respectively connected with the 4 th pin of the first control main chip U1 and one end of the fourth capacitor C4, the emitter of the sixth triode Q6 is connected with one end of the third resistor R3, the other end of the third resistor R3 is respectively connected with the fourth resistor R4 and the third capacitor C3, the 3 rd pin of the first control main chip U1, the 1 st pin of the first control main chip U1 is respectively connected with one end of the first capacitor C1, the second capacitor C2, the eighth diode D8 and the ninth diode D9, the other end of the first capacitor C1 is connected with one end of the second resistor R2, the other end of the second resistor R2 is respectively connected with the other end of the second capacitor C2, the other end of the third capacitor C3 and the other end of the first control main chip U1 is connected with the third capacitor C3, and the other end of the third capacitor C3 is connected with the third capacitor C4; the other end of the fourth resistor R4 is connected with one end of a ninth resistor R9 and then connected with one end of a tenth resistor R10, the other end of the tenth resistor R10 is grounded, the other end of the ninth resistor R9 is connected with one end of a fourth diode D4, the other end of the fourth diode D4 is connected with one end of an eighth resistor R8 and then connected with the 3 rd pin of the first inductor L1, the first MOS tube Q1 is connected with the 1 st pin of the first inductor L1, the other end of the eighth resistor R8 is connected with the 4 th pin of the first inductor L1 and then grounded, the 2 nd pin of the first inductor L1 is connected with the second diode D2 and then connected with one end of the second inductor L2, the other end of the second inductor L2 is respectively connected with the 1 st pin of the second MOS tube Q2 and one end of the third diode D3, the other end of the third diode D3 is connected with one end of the second electrolytic capacitor EC2 and then outputs a live wire, the other end of the second electrolytic capacitor EC2 outputs a zero wire, the 2 nd pin of the second MOS tube Q2 is connected with one end of a seventeenth resistor R17 and an emitter of a thirteenth electrode tube Q10 in sequence and then is connected with one end of a sixteenth resistor R16, the other end of the sixteenth resistor R16 is respectively connected with one end of a base electrode of the thirteenth electrode tube Q10 and one end of a fifteenth resistor R15, a collector of the thirteenth electrode tube Q10 is respectively connected with the 3 rd pin of the second MOS tube Q2 and the 1 st pin of a third inductor L3 after being connected with the other end of the seventeenth resistor R17, the 2 nd pin of the third inductor L3 is connected with the 4 th pin and grounded, the 3 rd pin of the third inductor L3 is connected with one end of a twentieth resistor R20 and then is connected with one end of a fifth diode D5, the other end of the twentieth resistor R20 is connected with one end of an eighteenth resistor R18, the other end of the eighteenth resistor R18 is respectively connected with one end of a nineteenth resistor R19 and one end of a thirteenth resistor R13, the other end of the nineteenth resistor R19 is grounded, the other end of the thirteenth resistor R13 is connected with one end of a twelfth resistor R12 and then is respectively connected with one end of a third pin and one end of an eighth capacitor C8 of a second control main chip U2, the other end of the twelfth resistor R12 is connected with one end of a seventh triode Q7, a collector electrode of the seventh triode Q7 is respectively connected with one end of a fourteenth resistor R14 and one end of a fourth pin of the second control main chip U2, a base electrode of the fourteenth resistor R14 is connected with the base electrode of the seventh triode Q7 and then is respectively connected with one end of a fourth pin and a ninth capacitor C9 of the second control main chip U2, the other end of the ninth capacitor C9 is connected with the other end of an eighth capacitor C8 and then is grounded, the grounded end is respectively connected with one end of a second pin 2 of the second control main chip U2, one end of a seventh capacitor C7 and one end of an eleventh resistor R11, the other end of the eleventh resistor R11 is connected with one end of a sixth capacitor C6, the other end of the sixth capacitor C6 is respectively connected with the other end of the seventh capacitor C7 and then is respectively connected with one end of the first pin 1 of the second control main chip U2, the seventh diode D7, the other end of the tenth diode D10D 21, the eighth diode D21 and the other end of the twenty-second diode D22 are connected with the twenty-second end of the twenty-second resistor R22, and the twenty-second end of the twenty-second resistor R22 are connected with the twenty-second end of the twenty-eighth resistor R21; the other end of the sixth diode D6 is connected with the other end of the ninth diode D9 and then is connected with the 1 st pin of the ninth MOS transistor Q9, the 3 rd pin of the ninth MOS transistor Q9 is respectively connected with one end of the first voltage stabilizing tube Z1, one end of the eighth triode Q8 emitter and one end of the thirty second resistor R32 and then is grounded, the 2 nd pin of the ninth MOS transistor Q9 is connected with the other end of the first voltage stabilizing tube Z1 and then is respectively connected with one end of the twelfth diode D10, the collector of the eighth triode Q8 and one end of the thirty first resistor R30, the base of the eighth triode Q8 is connected with the other end of the thirty second resistor R32 and then is connected with one end of the thirty first resistor R31, the other end of the thirty first resistor R31 is respectively connected with the 1 st pin of the comparator U3, the other end of the thirty second resistor R30 is respectively connected with the fourteenth capacitor C14, one end of the eleventh diode D11 and one end of the twelfth diode D12, the other end of the twenty fourth resistor D14 is grounded, the other end of the twenty second diode D11 is respectively connected with the twenty fifth resistor R25, the twenty-third resistor R25 and the twenty-third resistor R3, the twenty-second end of the twenty-third resistor R3 is connected with the twenty-third end of the twenty-third resistor R3, the twenty-third end is connected with the twenty-third end of the twenty-third resistor R3, and the twenty-third end is connected with the twenty-third end of the twenty-third resistor, and the twenty-third end is connected with the twenty-third end 3, and the twenty-third end is connected with the twenty-third end, and the twenty-one; the other end of the twelfth diode D12 is connected with one end of a Va pin and one end of a twenty-sixth resistor R26 respectively, and the other end of the twenty-sixth resistor R26 is connected with the twenty-eighth resistor R28 and the other end of a twelfth capacitor C12 in sequence and then connected with the 3 rd pin of the comparator U3.
The working principle of this embodiment is as follows:
the automatic conversion of Buck-Boost is identified by detecting the input and output voltages, and the voltage of input (Va) and output (Vb) is compared by a comparator U3, and then the main chips U1 and U2 are controlled respectively, so that the circuit operates in a working mode.
The network reference numerals "Va" and "Vb" are reference numerals of input and output voltages, respectively. U1 is a main control chip of the Buck circuit; u2 is the main control chip of the Boost circuit, Q1 is the P-channel MOSFET used for the control switch of the Buck circuit, Q2 is the N-channel MOSFET used for the control switch of the Boost circuit, D2 is the freewheeling diode of the Buck circuit; d3, a Boost diode of the Boost circuit; l2: a freewheeling inductance, which may be referred to as Boost circuit, and a Boost inductance, which may also be referred to as Boost circuit.
The Buck circuit works:
corresponding to the U3_2 and U3_3 of the comparator U3 (U3_2 is the 2 nd pin of the comparator U3), when the voltage of the network mark Va divided by the resistors R26 and R28 is larger than the voltage of the network mark Vb divided by the resistors R25 and R27, namely the voltage of the U3_3 is larger than the voltage of the U3_2, the U3_1 of the comparator U3 outputs high level, the triode Q8 is saturated and conducted after the voltage is divided by the resistors R31 and R32, the ground is grounded between the Q8C-E, the U2_1 pin of the main control chip U2 is grounded between the diode D10 and the triode Q8C-E, the voltage of the U2_1 of the main control chip U2 is pulled to 0V, the U2 stops working, namely the U2_6 pin does not output a driving signal, and the U2_6 is in a low level through the resistors R15 and R16 to the MOS tube Q2G-S, and the circuit cannot be turned on, namely the circuit cannot work; the other Buck circuit is saturated and conducted by the triode Q8, so that the Q9-G-S of the MOS tube Q9 is not provided with voltage, namely the MOS tube Q9 cannot work, the Q9 loses control over the main control chip U1, at the moment, the main control chip U1 starts to work, the chip U1-6 outputs high level, the high level is added to the Q5-G-S of the MOS tube Q5 through the resistor R6, the Q5-D-S is enabled to be connected to the ground, namely conditions are created for saturated and conducted by the triode Q4, the saturated and conducted by the Q4-E-C are equivalent to the Q1-G of the MOS tube Q1 to the ground, and at the moment, the MOS tube Q1 of the P hook is conducted. The input direct current power supply (IN+) is transmitted to the follow current inductor L2 through the MOS tube Q1 and charges the capacitor EC2 with positive and negative voltages through the diode D3, meanwhile, the inductor L2 also generates a left-positive and right-negative electromotive force, and when the voltage charged by the capacitor EC2 is higher than the set voltage after being divided by the resistors R21, R22, R23 and R24, the voltage is fed back to the U1_1 of the main control chip U1 through the diode D8. The U1_1 is the output end of a comparator in the main control chip, the positive input end of the comparator is a reference voltage of 2.5V, the U1_2 is the negative input end of the comparator, and the external circuit is grounded with the U1_2, namely the voltage of the U1_1 is equal to the voltage of the positive input end of the comparator in the chip by 2.5V. Because U1_1 is stable at 2.5V, when the divided voltage is higher than the voltage of U1_1, U1_1 in the chip is compared with U1_3, the main control chip U1 controls U1_6 to output a low level, and the low level is added to Q5_G-S of the MOS transistor Q5 through the resistor R6 to enable the Q5_D-S to be not conducted, and because Va voltage is added to Q4_B of the triode Q4 through the resistor R1, namely, the triode Q4 is cut off, and the cut-off of the Q4 enables the MOS transistor Q1 of the P-hook to be not conducted. The MOS transistor Q1 of the P-channel is turned off, the freewheeling inductor L2 generates reverse right positive left negative electromotive force, and the reverse right positive left negative electromotive force returns to the left side of the freewheeling inductor L2 through the diode D3, the capacitor EC2 and the freewheeling diode D2 to form a loop. After the free-wheeling inductor L2 is discharged, the voltage charged by the capacitor EC2 is divided by the resistors R21, R22, R23 and R24 and then is lower than the set voltage, the voltage is fed back to the u1_1 of the main control chip U1 through the diode D8, because the u1_1 is stable to change at 2.5V, when the divided voltage is lower than the voltage of the u1_1, the internal u1_1 of the chip is compared with the u1_3, the main control chip U1 controls the u1_6 to output a high level, and the Q5_g-S is added to the MOS transistor Q5 through the resistor R6, so that the Q5_d-S is conducted to the ground, namely, the working process of the previous cycle is repeated.
Boost circuit operation:
corresponding to the u3_2 and the u3_3 of the comparator U3, the voltage divided by the resistors R26 and R28 at the network label "Va" is smaller than the voltage divided by the resistors R25 and R27 at the network label "Vb", that is, the voltage of the u3_3 is smaller than the voltage of the u3_2, the u3_1 of the comparator U3 outputs a low level, the triode Q8 is turned off after being divided by the resistors R31 and R32, the Q8_c-E cannot be conducted, the power supply voltage of the u3_8 of the comparator U3 is added to the voltage stabilizing tube Z1 through the resistor R30 to form a voltage, so that the MOS tube Q9 meets the conducting condition, that is, the Q9_d-S is conducted to the ground. The U1-1 pin of the main control chip U1 is grounded through the diode D9 and the MOS transistor Q9-D-S, so that the voltage of the U1-1 pin of the main control chip U1 is pulled to 0V, and the U1 stops working, namely the U1-6 pin has no driving signal output; Q4_B of the triode Q4 is grounded through a diode D8 and a MOS transistor Q9_D-S, so that Q4_E-C is saturated and conducted, namely Q1_G of the MOS transistor Q1 is grounded, and at the moment, the MOS transistor Q1 of the P-channel is conducted, so that conditions are created for the operation of a Boost circuit. The voltage of the U1_1 of the main control chip U1 is pulled to 0V, i.e. the Buck circuit cannot work. And the other Boost circuit, because of the cut-off of the triode Q8, the Q8 loses the control of the main control chip U2, at this moment, the main control chip U2 starts to work, the chip U2-6 outputs high level, the driving voltage is added to the Q2-G-S of the MOS tube Q2 through the resistors R15 and R16, and the Q2-D-S is turned on. An input direct current power supply (IN+) is transmitted to a boost inductor L2 through a MOS tube Q1 and passes through the MOS tube Q2 to the ground, the boost inductor L2 generates a left positive and right negative electromotive force, during the conduction period of the MOS tube Q2, a capacitor EC2 is responsible for providing energy for output, meanwhile, the current of the boost inductor L2 is continuously increased, the current of a transformer L3 is continuously increased, when the current exceeds the set voltage of a U2_3 of a main control chip U2, the U2_1 IN the chip is compared with the U2_3, the main control chip U2 controls the U2 to output a low level, and driving voltage is added to the Q2_G-S of the MOS tube Q2 through resistors R15 and R16, so that the Q2_D-S cannot be opened. The Q2D-S is turned off, so that the boost inductor L2 generates a right positive left negative reverse electromotive force, and a loop is formed by returning the diode D3, the capacitor EC2 and the flywheel diode D2 to the left negative electrode of the boost inductor L2. After the up-flow inductor L2 is discharged, the voltage charged by the capacitor EC2 is divided by the resistors R21, R22, R23 and R24 and then is lower than the set voltage, the voltage is fed back to the U2_1 of the main control chip U2 through the diode D7, because the U2_1 is stable to change at 2.5V, when the divided voltage is lower than the voltage of the U2_1, the internal U2_1 of the chip is compared with the U1_2, the main control chip U2 controls the U2_6 to output a high level, and the voltage is added to the Q2_G-S of the MOS transistor Q2 through the resistors R15 and R16, so that the Q2_D-S is conducted to the ground, namely the working process of the previous period is repeated.
The above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, so that all changes made in the shape and principles of the present invention are covered by the scope of the present invention.

Claims (1)

1. The Buck-Boost application circuit is characterized in that: the power supply zero line is connected with one end of a first diode (D1) and one end of a first electrolytic capacitor (EC 1) and then grounded, the emitter of a power supply live wire is connected with the first diode (D1) and the other end of the first electrolytic capacitor (EC 1) and then is respectively connected with a 7 th pin of the first control main chip (U1), a fifth capacitor (C5), a collector of a third triode (Q3), a first resistor (R1) and a source of the first MOS tube (Q1), the other end of the first resistor (R1) is connected with the D pin of the fifth MOS tube (Q5) and one end of a sixth diode (D6) and one end of a fourth triode (Q4), the emitter of the third MOS tube (Q3) is connected with the fourth pin of the fourth transistor (Q4) and then is connected with the first end of the seventh MOS tube (Q1) and then is connected with the other end of the seventh MOS tube (Q5), and then is connected with the other end of the seventh MOS tube (Q5); the other end of the sixth resistor (R6) is connected with the 6 th pin of the first control main chip (U1), the 8 th pin of the first control main chip (U1) is connected with one end of the fifth resistor (R5) and then is connected with the collector of the sixth triode (Q6), the base electrode of the sixth triode (Q6) is connected with the other end of the fifth resistor (R5) and then is respectively connected with the 4 th pin of the first control main chip (U1) and one end of the fourth capacitor (C4), the emitter of the sixth triode (Q6) is connected with one end of the third resistor (R3), the other end of the third resistor (R3) is respectively connected with the fourth resistor (R4) and the third capacitor (C3) and the third pin of the first control main chip (U1), the 1 first pin of the first control main chip (U1) is respectively connected with one end of the first capacitor (C1), the second capacitor (C2), the eighth diode (D8) and one end of the ninth diode (D9), and the other end of the first capacitor (C1) is respectively connected with the second resistor (R2) and the other end of the third resistor (C2) are respectively connected with the other end of the third resistor (C2) and the third capacitor (C2; the other end of the fourth resistor (R4) is connected with one end of a ninth resistor (R9) and then is connected with one end of a tenth resistor (R10), the other end of the tenth resistor (R10) is grounded, the other end of the ninth resistor (R9) is connected with one end of a fourth diode (D4), the other end of the fourth diode (D4) is connected with one end of an eighth resistor (R8) and then is connected with a 3 rd pin of a first inductor (L1), a first MOS tube (Q1) is connected with a 1 st pin of the first inductor (L1), the other end of the eighth resistor (R8) is connected with a 4 th pin of the first inductor (L1) and then is grounded, a 2 nd pin of the first inductor (L1) is connected with one end of a second diode (D2), the other end of the second inductor (L2) is respectively connected with a 1 st pin of a second MOS tube (Q2), one end of a third diode (D3), the other end of the third diode (D3) is connected with a second electrolytic capacitor (Q2), the other end of the third diode (D3) is connected with an output wire (Q2), the other end of the second capacitor (Q2) is connected with a sixteenth resistor (Q2), the base electrode (R2) is connected with a sixteenth resistor (R10) and a sixteenth resistor (Q2) is connected with a base electrode (R10) of a sixteenth resistor (Q2) in turn, the collector of the thirteenth polar tube (Q10) is connected with the other end of a seventeenth resistor (R17) and then is respectively connected with the 3 rd pin of a second MOS tube (Q2) and the 1 st pin of a third inductor (L3), the 2 nd pin of the third inductor (L3) is connected with the 4 th pin and grounded, the 3 rd pin of the third inductor (L3) is connected with one end of a twenty-first resistor (R20) and then is connected with one end of a fifth diode (D5), the other end of the twenty-first resistor (R20) is connected with the 4 th pin of the third inductor (L3), the other end of the fifth diode (D5) is connected with one end of an eighteenth resistor (R18), the other end of the eighteenth resistor (R18) is respectively connected with a nineteenth resistor (R19) and one end of a thirteenth resistor (R13), the other end of the nineteenth resistor (R19) is grounded, the other end of the thirteenth resistor (R13) is respectively connected with the third pin of a second control main chip (U2), the eighth capacitor (C8) is connected with one end of a twelfth resistor (R12), the seventeenth resistor (R7) is connected with the other end of the seventeenth resistor (R14) and then is connected with the base of the third transistor (Q2) and finally is connected with the other end of the seventeenth resistor (Q2), the other end of the ninth capacitor (C9) is connected with the other end of the eighth capacitor (C8) and then grounded, the grounded ends are respectively connected with the 2 nd pin of the second control main chip (U2), the seventh capacitor (C7) and one end of an eleventh resistor (R11), the other end of the eleventh resistor (R11) is connected with one end of a sixth capacitor (C6), the other end of the sixth capacitor (C6) is connected with the other end of the seventh capacitor (C7) and then respectively connected with the 1 st pin of the second control main chip (U2), one end of a seventh diode (D7) and one end of a twelfth diode (D10), the other end of the seventh diode (D7) is respectively connected with one end of a twenty-first resistor (R21), one end of a twenty-second resistor (R22), one end of a twenty-third resistor (R23) and one end of a twenty-fourth resistor (R24), the twenty-first resistor (R21) and the other end of the twenty-second resistor (R22) are connected with each other end of the fifth resistor, and the other end of the twenty-third resistor (R24) are connected with each other and then grounded; the other end of the sixth diode (D6) is connected with the other end of the ninth diode (D9) and then is connected with the 1 st pin of the ninth MOS tube (Q9), the 3 rd pin of the ninth MOS tube (Q9) is respectively connected with one end of the first voltage stabilizing tube (Z1), one end of the emitter of the eighth MOS tube (Q8) and one end of the thirty second resistor (R32) are connected with the ground, the 2 nd pin of the ninth MOS tube (Q9) is connected with the other end of the first voltage stabilizing tube (Z1) and then is respectively connected with the twelfth diode (D10), the collector of the eighth MOS tube (Q8) and one end of the thirty second resistor (R32), the base of the eighth MOS tube (Q8) is connected with one end of the thirty first resistor (R31) after being connected with the other end of the thirty second resistor (R32), the other end of the thirty first resistor (R31) is respectively connected with the 1 st pin of the comparator (U3), the other end of the thirty second resistor (R30) is respectively connected with the fourteenth capacitor (C14), the eleventh diode (U3), the eleventh diode (D11) and the eleventh capacitor (D11) are respectively connected with the twenty-second end of the thirty second resistor (R31), the twenty-third resistor (R30) is respectively connected with the twenty-third end of the twenty-third resistor (C25) and the twenty-second end of the twenty-third resistor (R11) is connected with the twenty-third capacitor (C25) and the twenty-second end of the twenty-third capacitor (11) is respectively, one end of a twenty-eighth resistor (R28) and one end of a twelfth capacitor (C12) are connected with the ground, the other end of the twenty-seventh resistor (R27) is connected with one end of a twenty-ninth resistor (R29) after being connected with the 2 nd pin of the comparator (U3), the other end of the twenty-ninth resistor (R29) is connected with one end of a thirteenth capacitor (C13), and the other end of the thirteenth capacitor (C13) is connected with the 1 st pin of the comparator (U3); the other end of the twelfth diode (D12) is respectively connected with one end of a Va pin and one end of a twenty-sixth resistor (R26), and the other end of the twenty-sixth resistor (R26) is sequentially connected with the other ends of a twenty-eighth resistor (R28) and a twelfth capacitor (C12) and then connected with the 3 rd pin of the comparator (U3).
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CN102195481A (en) * 2010-03-19 2011-09-21 英特赛尔美国股份有限公司 Modulating scheme for using single comparator in constant-frequency step-up/step-down converter
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