CN107666243B - Self-excitation synchronous rectification power supply circuit - Google Patents
Self-excitation synchronous rectification power supply circuit Download PDFInfo
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- CN107666243B CN107666243B CN201711114207.1A CN201711114207A CN107666243B CN 107666243 B CN107666243 B CN 107666243B CN 201711114207 A CN201711114207 A CN 201711114207A CN 107666243 B CN107666243 B CN 107666243B
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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
- H02M3/156—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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
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- 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)
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
A self-excitation synchronous rectification power supply circuit comprises a half-bridge driving unit, a synchronous rectification BUCK unit, an oscillation voltage divider, a time delay unit and a feedback control unit; the oscillating voltage divider is integrally connected between the low-side output voltage end and the reference ground end, and the dividing connecting end of the oscillating voltage divider is connected to the input end of the half-bridge driving unit through the delay unit; the self-oscillation unit is composed of an oscillation voltage divider, a delay unit, a half-bridge driving unit input end and a low-side output voltage end; the output of the feedback control unit is connected with the partial pressure connecting end of the oscillation voltage divider so as to control the oscillation start and stop of the self-oscillation unit; the feedback control unit comprises a drain comparator and a reference power supply, wherein the reference power supply is connected with the non-inverting input end of the drain comparator, and the inverting input end of the drain comparator is connected with the output of the output sampling unit; the invention has simple structure and improves the working efficiency and the output power of the circuit.
Description
Technical Field
The invention relates to a self-excited switching power supply technology, in particular to a self-excited synchronous rectification power supply circuit.
Background
Compared with the separate excitation type DC/DC converter and the linear voltage stabilizing circuit, the self-excitation type DC/DC converter has the advantages of simple circuit, fewer components, high efficiency, low cost and the like. The main switching tube of the current self-excited Buck converter is generally realized by a bipolar transistor; the switching-on control of the switching tube is realized by adding an auxiliary winding to the output filter inductance; the signal after the output voltage is sampled is compared with the voltage Vbe of the triode, the turn-off control of the switching tube is realized through a certain circuit, and the aim of stabilizing the output voltage is achieved, but because the circuit topology is simple, some unnecessary power dissipation exists, and control optimization is lacking, the circuit efficiency and the output power cannot be improved at the same time, or the efficiency is lower in high-power application occasions due to larger dissipation, or the power output is difficult to improve in high-efficiency application occasions; in addition, many driving units are usually dependent on the signal input of the external oscillation source or the chip structure integrated with the internal oscillation source, and the complexity of the circuit and the cost of price are high, so that in order to solve the problem, intensive research is necessary.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides the self-excitation synchronous rectification circuit which has a simple structure and can improve the efficiency and the power output.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a self-excited synchronous rectification power supply circuit comprises a half-bridge driving unit and a synchronous rectification BUCK unit;
the half-bridge driving unit comprises a high-side output voltage end and a low-side output voltage end, the working level of the low-side output voltage end and the input level of the half-bridge driving unit have an inverse logic corresponding relation, and the working level of the high-side output voltage end and the input level of the half-bridge driving unit have an in-phase logic corresponding relation;
the synchronous rectification BUCK unit comprises a power supply, an upper bridge power switching tube, a lower bridge power switching tube, a power inductor, an energy storage capacitor and an output sampling unit, wherein the output of the power supply is connected with the drain electrode of the upper bridge power switching tube, the source electrode of the upper bridge power switching tube is connected with the drain electrode of the lower bridge power switching tube, the source electrode of the lower bridge power switching tube is connected with a reference ground terminal, the connecting terminal of the upper bridge power switching tube and the lower bridge power switching tube is connected with one end of the power inductor, and the other end of the power inductor is connected to the reference ground terminal through the energy storage capacitor; the grid electrode of the upper bridge power switching tube is correspondingly connected with the high-side output voltage end of the half-bridge driving unit, and the grid electrode of the lower bridge power switching tube is correspondingly connected with the low-side output voltage end of the half-bridge driving unit; the output sampling unit is connected with the output of the synchronous rectification BUCK unit so as to acquire output voltage and provide feedback output;
the system also comprises an oscillating voltage divider, a delay unit and a feedback control unit; the oscillating voltage divider is integrally connected between the low-side output voltage end and the reference ground end, and the dividing connecting end of the oscillating voltage divider is connected to the input end of the half-bridge driving unit through the delay unit; the self-oscillation unit is composed of an oscillation voltage divider, a delay unit, a half-bridge driving unit input end and a low-side output voltage end;
the output of the feedback control unit is connected with the partial pressure connecting end of the oscillation voltage divider so as to control the oscillation start and stop and the frequency adjustment of the self-oscillation unit; the feedback control unit comprises an open-drain comparator and a reference power supply, wherein the reference power supply is connected with the non-inverting input end of the open-drain comparator, and the inverting input end of the open-drain comparator is connected with the output of the output sampling unit.
Further, the feedback control unit further comprises an advanced feedback branch connected between the output end of the open-drain comparator and the inverting input end.
Further, the advanced feedback branch comprises a feedback resistor and a feedback capacitor, and the feedback resistor and the feedback capacitor are connected in series and are integrally connected between the output end and the inverting input end of the open-drain comparator.
Further, the delay unit comprises a low-pass filtering unit.
Further, the low-pass filter unit comprises a frequency adjusting resistor and a frequency adjusting capacitor, one end of the frequency adjusting resistor is connected with a voltage dividing connecting end of the oscillating voltage divider, the other end of the frequency adjusting resistor is connected with the input of the half-bridge driving unit, one end of the frequency adjusting capacitor is connected with the input of the half-bridge driving unit, and the other end of the frequency adjusting capacitor is connected with circuit reference ground.
Further, the half-bridge driving unit comprises a half-bridge driving chip, a direct current power supply, a bootstrap diode and a bootstrap capacitor; the half-bridge driving chip is provided with a high-side output voltage end, a low-side output voltage end, a high-side floating offset voltage end, a high-side floating absolute voltage end, a power supply end and a public end; the positive electrode of the direct current power supply is connected with the power end of the half-bridge driving chip, and the negative electrode of the direct current power supply is connected with the public end of the half-bridge driving chip; the anode of the bootstrap diode is connected with the power end of the half-bridge driving chip, and the cathode of the bootstrap diode is connected with the high-side floating absolute voltage end of the half-bridge driving chip; the positive electrode of the bootstrap capacitor is connected with the high-side floating absolute voltage end of the half-bridge driving chip, and the negative electrode of the bootstrap capacitor is connected with the high-side floating offset voltage end.
Further, the half-bridge driving chip further comprises a dead zone adjusting end, and the half-bridge driving unit correspondingly further comprises an adjusting resistor; the dead zone adjusting end is connected with a reference ground end through an adjusting resistor.
Further, the device also comprises a high-frequency filter, and the high-frequency filter is connected with the energy storage capacitor in parallel.
Further, the output sampling unit and the oscillating voltage divider both comprise a resistor divider.
The self-oscillation unit is formed by the oscillation voltage divider, the delay unit, the input end of the half-bridge driving unit and the low-side output voltage end, the self-oscillation unit is simple in structure, fewer elements are needed, the delay time and element parameters of the delay unit are convenient to replace, the self-oscillation unit is suitable for application occasions with different powers, meanwhile, the oscillation unit is not required to be independently arranged in the half-bridge driving unit or other driving units, the conduction time of the lower bridge switching power tube is synchronous with the follow current time in the self-oscillation period, the lower bridge switching power tube is in a conduction state in the follow current stage, at the moment, the follow current diode in the lower bridge switching power tube is short-circuited, compared with the diode follow current power consumption of the traditional BCUK basic circuit, the efficiency is improved; in addition, the self-oscillation unit is combined with the open-leakage comparator, particularly, after the delay unit adopts the low-pass filter unit, the oscillation output frequency of the half-bridge driving unit is related to the output voltage, and the self-oscillation process can be automatically started and shut off; furthermore, the circuit can adapt to 600V high-voltage power supply to the power supply, is also suitable for small-voltage power supply, and has a larger working power supply voltage elastic range.
Drawings
Fig. 1 is a logical block diagram of an embodiment.
Fig. 2 is a schematic circuit diagram of an embodiment.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.
A self-excitation synchronous rectification power supply circuit is shown in figure 1, and comprises a half-bridge driving unit, a synchronous rectification BUCK unit, a feedback control unit, an oscillation voltage divider and a delay unit, wherein the half-bridge driving unit, the oscillation voltage divider and the delay unit form a self-excitation oscillation unit, an oscillation signal is output to control the action of a switching tube of the synchronous rectification BUCK unit, and the feedback control unit adjusts the frequency of a self-excitation oscillator and the start and stop of oscillation in real time according to the output voltage;
as shown IN fig. 2, the half-bridge driving unit includes a half-bridge driving chip U1, a dc power supply V1, a bootstrap diode D1, and a bootstrap capacitor C1, where the half-bridge driving chip has a high-side output voltage terminal HO, a low-side output voltage terminal LO, a high-side floating offset voltage terminal VS, a high-side floating absolute voltage terminal VB, a power supply terminal VDD, a common terminal COM, and a dead zone adjusting terminal RDT, the working level of the low-side output voltage terminal LO has an inverse logic relationship with the input terminal IN level of the half-bridge driving unit, and the working level of the high-side output voltage terminal HO has an IN-phase logic relationship with the input terminal IN level of the half-bridge driving unit; the positive electrode of the direct current power supply V1 is connected with the power end VDD of the half-bridge driving chip U1, and the negative electrode of the direct current power supply V1 is connected with the public end COM of the half-bridge driving chip and is used for providing a stable power signal for the half-bridge driving chip U1; the anode of the bootstrap diode D1 is connected with the half-bridge driving chip VDD, and the cathode of the bootstrap diode D1 is connected with the high-side floating absolute voltage end VB of the half-bridge driving chip U1 and is used for providing a power supply path for the high-side floating end and blocking the influence of the high voltage of the floating end on the direct current power supply V1 for half-bridge power supply; the positive electrode of the bootstrap capacitor C1 is connected with the high-side floating absolute voltage end VB of the half-bridge driving chip U1, and the negative electrode of the bootstrap capacitor C is connected with the high-side floating offset voltage end VS and used for storing charges of the high-side floating end so as to ensure that the VB always maintains stable voltage relative to the VS;
the synchronous rectification BUCK unit comprises an upper bridge power switch tube NMOS1, a lower bridge power switch tube NMOS2, a power inductor L1 and an energy storage capacitor C2, wherein the upper bridge power switch tube NMOS1 and the lower bridge power switch tube NMOS2 are connected in series with a power supply V2, the connection end of the upper bridge power switch tube NMOS1 and the lower bridge power switch tube NMOS2 is connected with one end of the power inductor L1, and the energy storage capacitor C2 is connected with the other end of the power inductor L1 and a reference ground end GND; the control end of the upper bridge power switching tube NMOS1 is correspondingly connected with the high-side output voltage end HO of the half-bridge driving chip U1, and the series connection resistance can be adjusted to a proper switching rate; the control end of the lower bridge power switching tube is correspondingly connected with the low side output voltage end LO of the half bridge driving chip U1, and the series connection resistor can be adjusted to a proper switching rate; the high-side floating offset voltage end VS of the half-bridge driving chip U1 is connected with the source electrode of the upper bridge power switch tube NMOS1 and the drain electrode of the lower bridge power switch tube NMOS 2; the common end COM of the half-bridge driving chip U1 is connected with the reference ground end GND; the dead zone adjusting end RDT of the half-bridge driving chip U1 is connected with the adjusting resistor R1, the other end of the adjusting resistor R1 is connected with the reference ground end GND and the public end COM of the half-bridge driving chip, the dead zone time can be increased by increasing the resistance value of the dead zone adjusting resistor, and the other lower bridge switch power tube NMOS 2/upper bridge switch power tube NMOS1 is started after the upper bridge switch power tube NMOS 1/lower bridge switch power tube NMOS2 is completely closed; and a freewheeling diode is arranged in the lower bridge power switch tube NOMS2, the cathode of the freewheeling diode is connected with the power inductor L1 and the connecting end of the upper bridge power switch tube NMOS1, and the freewheeling function is automatically clamped and realized when the starting resistance of the lower bridge power switch tube NMOS2 is larger, so that the normal operation of the circuit is ensured.
The output sampling unit consists of a resistor voltage divider consisting of a resistor R2 and a resistor R3 and is connected with the output of the synchronous rectification BUCK unit so as to acquire output voltage and provide feedback output; the feedback voltage of the output voltage can be adjusted by adjusting the ratio of the R2 and R3 resistance values, and the frequency of the feedback control unit and the half-bridge driving unit is adjusted to further adjust the output voltage;
as shown IN fig. 1, the oscillating voltage divider is composed of a resistor R5 and a resistor R6, the resistor divider composed of the resistor R5 and the resistor R6 is integrally connected between the low-side output voltage end LO of the half-bridge driving chip U1 and the reference ground, and the dividing connection end of the oscillating voltage divider is connected to the input end IN of the half-bridge driving chip U1 through a delay unit; the self-oscillation unit is composed of an oscillation voltage divider, a delay unit, a half-bridge driving unit input end and a low-side output voltage end; on the other hand, as the voltage value of the high level is larger than the voltage threshold value of the input end IN of the half-bridge driving chip U1 when the low-side output voltage end LO of the half-bridge driving chip U1 outputs the high level, the voltage reduction function can be realized through the oscillation voltage divider, so that the reliable and stable operation of the circuit is ensured;
the output of the feedback control unit is connected with the partial pressure connecting end of the oscillation voltage divider so as to control the oscillation start and stop of the self-oscillation unit; the feedback control unit comprises an open-drain comparator U2, a reference power supply VREF and an advanced feedback branch, wherein the reference power supply VREF is connected with the non-inverting input end of the open-drain comparator U2, and the inverting input end of the open-drain comparator U2 is connected with the output of the output sampling unit; the advanced feedback branch comprises a feedback resistor R4 and a feedback capacitor C4 which are connected in series, and the advanced feedback branch can improve the action rate of the feedback control unit.
When the output voltage is higher, the open-drain comparator outputs a low level, the voltage of the voltage division connecting end of the oscillating voltage divider is pulled to the low level, so that the input of the half-bridge driving unit is in the low level, the self-oscillation unit stops oscillating, and when the output voltage is lower, the voltage division connecting end of the oscillating voltage divider is in a high value of the oscillating voltage division voltage and the output voltage of the open-drain comparator, so that the self-oscillation unit resumes oscillating;
the delay unit comprises a low-pass filter unit, as shown IN fig. 1, the low-pass filter unit comprises a frequency adjusting resistor R7 and a frequency adjusting capacitor C3, one end of the frequency adjusting resistor R7 is connected with a voltage dividing connecting end of the oscillating voltage divider, the other end of the frequency adjusting resistor R7 is connected with the input of the half-bridge driving unit, one end of the frequency adjusting capacitor C3 is connected with the input end IN of the half-bridge driving chip, and the other end of the frequency adjusting capacitor C3 is connected with the circuit ground GND.
When the input end IN of the half-bridge driving chip U1 is at a high level, the output of the high-side output voltage end HO is high relative to the high-side floating offset voltage end VS, the upper bridge switch power tube NMOS1 is started, at the moment, the lower bridge switch power tube NOMS2 is turned off, when the input end IN of the half-bridge driving chip U1 is at a low level, the upper bridge switch power tube NMOS1 is turned off, the lower bridge switch power tube NOMS2 body diode freewheels, after dead time, the lower bridge switch power tube NOMS2 is started, the current is freewheels through a NOMS2 conduction path, when the voltage of the high-side floating offset voltage end VS of the half-bridge driving chip U1 is reduced to the bootstrap diode D1, the bootstrap capacitor C1 is charged through the bootstrap diode D1, the input end IN of the half-bridge driving chip U1 is at a high level IN the next period, the low-side output voltage end LO of the half-bridge driving chip U1 is low, the lower bridge switch power tube NOMS2 is turned off, after the dead time, the high-side output end HO of the half-bridge driving chip U1 is relatively started, and the voltage end VS is gradually risen after the dead time, and the whole process is circulated sequentially.
When the upper bridge switching power tube NOMS1 is turned on, the power inductor L1 and the energy storage capacitor C2 form an LC filter circuit, current charges the energy storage capacitor C2 through the upper bridge switching power tube NOMS1 and the power inductor L1, when the upper bridge arm is turned off and then passes through a dead time, the lower bridge switching power tube NOMS2 is turned on, and counter electromotive force generated by the energy storage inductor L1 is released through the path. The high-frequency filter A1 reduces the influence of ripple waves and is connected with a load in parallel when in use; the voltage is relatively constant after high frequency filtering, and then stable voltage can be provided for the load.
When the output voltage of the feedback control unit is higher than the reference power supply VREF, the output of the open-drain comparator U2 is low, the high-side output end HO of the half-bridge driving chip U1 is low, the output is powered by the energy storage capacitor C2 until the output voltage of the feedback control unit is lower than the reference power supply VREF, the output of the open-drain comparator U2 is pulled up through the resistor R5, the circuit recovers the self-excited oscillation working state, and therefore the dynamic adjustment of the output voltage is achieved, an advanced feedback circuit is formed by R4 and C4, the corresponding speed is improved, and the self-excited synchronous rectification circuit outputs voltage VOUT=VREF (R3/R2+1).
When the voltage output is higher, the voltage of the inverting input end of the open-drain comparator U2 is higher than the input voltage of the non-inverting end of the open-drain comparator U2 through the voltage division of the resistor R2 and the resistor R3, the output of the open-drain comparator U2 is low, the input end IN voltage of the half-bridge driving chip U1 is pulled to a low level, the low-side output voltage end LO outputs a high level, and the self-oscillation unit pauses oscillation due to the fact that the input end is limited to the low level; the grid electrode of the lower bridge power switch tube NMOS2 is connected with a high level to be conducted, so that the follow current diode is short-circuited, the continuous current value is increased, and the power consumption of the lower bridge power switch tube NMOS2 is lower than that of an independent follow current diode due to the fact that the on resistance of the lower bridge power switch tube NMOS2 is lower, and efficiency conversion and power output are improved.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (9)
1. A self-excited synchronous rectification power supply circuit comprises a half-bridge driving unit and a synchronous rectification BUCK unit;
the half-bridge driving unit comprises a high-side output voltage end and a low-side output voltage end, the working level of the low-side output voltage end and the input level of the half-bridge driving unit have an inverse logic corresponding relation, and the working level of the high-side output voltage end and the input level of the half-bridge driving unit have an in-phase logic corresponding relation;
the synchronous rectification BUCK unit comprises a power supply, an upper bridge power switching tube, a lower bridge power switching tube, a power inductor, an energy storage capacitor and an output sampling unit, wherein the output of the power supply is connected with the drain electrode of the upper bridge power switching tube, the source electrode of the upper bridge power switching tube is connected with the drain electrode of the lower bridge power switching tube, the source electrode of the lower bridge power switching tube is connected with a reference ground terminal, the connecting terminal of the upper bridge power switching tube and the lower bridge power switching tube is connected with one end of the power inductor, and the other end of the power inductor is connected to the reference ground terminal through the energy storage capacitor; the grid electrode of the upper bridge power switching tube is correspondingly connected with the high-side output voltage end of the half-bridge driving unit, and the grid electrode of the lower bridge power switching tube is correspondingly connected with the low-side output voltage end of the half-bridge driving unit; the output sampling unit is connected with the output of the synchronous rectification BUCK unit so as to acquire output voltage and provide feedback output;
the method is characterized in that: the system also comprises an oscillating voltage divider, a delay unit and a feedback control unit; the oscillating voltage divider is integrally connected between the low-side output voltage end and the reference ground end, and the dividing connecting end of the oscillating voltage divider is connected to the input end of the half-bridge driving unit through the delay unit; the self-oscillation unit is composed of an oscillation voltage divider, a delay unit, a half-bridge driving unit input end and a low-side output voltage end;
the output of the feedback control unit is connected with the partial pressure connecting end of the oscillation voltage divider so as to control the oscillation start and stop and the oscillation frequency adjustment of the self-oscillation unit; the feedback control unit comprises an open-drain comparator and a reference power supply, wherein the reference power supply is connected with the non-inverting input end of the open-drain comparator, and the inverting input end of the open-drain comparator is connected with the output of the output sampling unit.
2. A self-exciting synchronous rectification power supply circuit as claimed in claim 1, wherein: the feedback control unit also comprises an advanced feedback branch, and the advanced feedback branch is connected between the output end and the inverting input end of the open-drain comparator.
3. A self-exciting synchronous rectification power supply circuit as claimed in claim 2, wherein: the advanced feedback branch comprises a feedback resistor and a feedback capacitor, wherein the feedback resistor and the feedback capacitor are connected in series and are integrally connected between the output end and the inverting input end of the open-drain comparator.
4. A self-exciting synchronous rectification power supply circuit as claimed in claim 1, wherein: the delay unit comprises a low pass filter unit.
5. A self-exciting synchronous rectification power supply circuit as claimed in claim 4, wherein: the low-pass filter unit comprises a frequency adjusting resistor and a frequency adjusting capacitor, one end of the frequency adjusting resistor is connected with a voltage dividing connecting end of the oscillating voltage divider, the other end of the frequency adjusting resistor is connected with the input of the half-bridge driving unit, one end of the frequency adjusting capacitor is connected with the input of the half-bridge driving unit, and the other end of the frequency adjusting capacitor is connected with circuit reference ground.
6. A self-exciting synchronous rectification power supply circuit as claimed in claim 1, wherein: the half-bridge driving unit comprises a half-bridge driving chip, a direct current power supply, a bootstrap diode and a bootstrap capacitor; the half-bridge driving chip is provided with a high-side output voltage end, a low-side output voltage end, a high-side floating offset voltage end, a high-side floating absolute voltage end, a power supply end and a public end; the positive electrode of the direct current power supply is connected with the power end of the half-bridge driving chip, and the negative electrode of the direct current power supply is connected with the public end of the half-bridge driving chip; the anode of the bootstrap diode is connected with the power end of the half-bridge driving chip, and the cathode of the bootstrap diode is connected with the high-side floating absolute voltage end of the half-bridge driving chip; the positive electrode of the bootstrap capacitor is connected with the high-side floating absolute voltage end of the half-bridge driving chip, and the negative electrode of the bootstrap capacitor is connected with the high-side floating offset voltage end.
7. A self-exciting synchronous rectification power supply circuit as claimed in claim 6, wherein: the half-bridge driving chip further comprises a dead zone adjusting end, and correspondingly, the half-bridge driving unit further comprises an adjusting resistor; the dead zone adjusting end is connected with a reference ground end through an adjusting resistor.
8. A self-exciting synchronous rectification power supply circuit as claimed in claim 1, wherein: the high-frequency filter is connected with the energy storage capacitor in parallel.
9. A self-exciting synchronous rectification power supply circuit as claimed in claim 1, wherein: the output sampling unit and the oscillating voltage divider both comprise a resistor divider.
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| CN107979359B (en) * | 2018-01-11 | 2023-12-22 | 苏州锴威特半导体股份有限公司 | Clock synchronization circuit for maintaining fixed pulse |
| CN108448886B (en) * | 2018-04-17 | 2020-08-18 | 华南理工大学 | Boock converter bootstrap drive circuit |
| CN110445352B (en) * | 2018-11-26 | 2020-08-21 | 江西滨凌科技有限公司 | Method and device for reducing power consumption of frequency converter of integrated scroll compressor |
| CN110391736A (en) * | 2019-07-22 | 2019-10-29 | 西安易朴通讯技术有限公司 | The control circuit of BUCK converter |
| CN114785098B (en) * | 2022-06-14 | 2022-09-09 | 上海芯龙半导体技术股份有限公司南京分公司 | Drive circuit and power supply chip |
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| US6657399B2 (en) * | 2001-01-26 | 2003-12-02 | International Rectifier Corporation | Self-oscillating circuit for driving high-side and low-side switching devices with variable width pulses |
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| CN107666243A (en) | 2018-02-06 |
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