CN116979819A - Power supply circuit of synchronous rectifier, power supply device and power supply equipment - Google Patents

Power supply circuit of synchronous rectifier, power supply device and power supply equipment Download PDF

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Publication number
CN116979819A
CN116979819A CN202211038682.6A CN202211038682A CN116979819A CN 116979819 A CN116979819 A CN 116979819A CN 202211038682 A CN202211038682 A CN 202211038682A CN 116979819 A CN116979819 A CN 116979819A
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CN
China
Prior art keywords
power supply
diode
capacitor
supply circuit
synchronous rectifier
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CN202211038682.6A
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Chinese (zh)
Inventor
张亮
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Shenzhen Injoinic Technology Co Ltd
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Shenzhen Injoinic Technology Co Ltd
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Priority to CN202211038682.6A priority Critical patent/CN116979819A/en
Publication of CN116979819A publication Critical patent/CN116979819A/en
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
    • 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
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/50—Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors
    • 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)
  • Rectifiers (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The embodiment of the application provides a power supply circuit, a power supply device and power supply equipment of a synchronous rectifier, wherein the power supply circuit comprises: the first triode Q1, the second triode Q2, the first diode D1, the second diode D2, the third diode D3, the diode group, the first capacitor C1, the second capacitor C2, the switch module, the comparator and the MOS tube Q3 can generate stable charging current to charge the power supply capacitor when the duty ratio of the converter is smaller, so that the electric quantity of the power supply capacitor is ensured, and the reliability of the synchronous rectifier during starting is improved.

Description

Power supply circuit of synchronous rectifier, power supply device and power supply equipment
Technical Field
The application relates to the technical field of circuit structures, in particular to a power supply circuit of a synchronous rectifier, a power supply device and power supply equipment.
Background
In a switching power supply, a diode is often required to carry out freewheeling, but the efficiency of the switching power supply is greatly affected due to a large conduction voltage drop. The synchronous rectifier uses the switching tube to replace the diode, and the on-resistance of the switching tube can be made very small, so that the voltage drop when the current passes through the switching tube can be very low, and the efficiency can be greatly improved. However, the synchronous rectification circuit needs to be driven to control the on and off of the switching tube, so that the circuit is complex, and the cost of the circuit is high.
In the prior art, when solving the problem of high cost, a self-powered circuit is generally adopted to supply power to the synchronous rectification circuit, but the prior art can cause insufficient power supply when the duty ratio of the converter is smaller, thereby influencing the starting reliability of the synchronous rectifier.
Disclosure of Invention
The embodiment of the application provides a power supply circuit, a power supply device and power supply equipment of a synchronous rectifier, which can generate stable charging current to charge a power supply capacitor when the duty ratio of a converter is smaller, thereby ensuring the electric quantity of the power supply capacitor and improving the reliability of the synchronous rectifier during starting.
A first aspect of an embodiment of the present application provides a power supply circuit of a synchronous rectifier, the power supply circuit including: the first triode Q1, the second triode Q2, the first diode D1, the second diode D2, the third diode D3, the diode group, the first capacitor C1, the second capacitor C2, the switch module, the comparator and the MOS tube Q3, wherein,
the first end of the first diode D1 is connected with the drain electrode of the MOS transistor Q3, the second end of the first diode D1 is connected with the grid electrode of the MOS transistor Q3, the first end of the first triode Q1, the first end of the second diode D2, the first end of the first capacitor C1 and the first end of the diode group,
the source electrode of the MOS transistor Q3 is connected with the second end of the diode group, the second end of the first capacitor C1 and the first end of the third diode D3, the second end of the third diode D3 is connected with the second end of the second diode, the first end of the second capacitor C2, the first end of the second triode Q2, the first end of the comparator and the power supply port of the synchronous rectifier,
the second end of the second triode Q2 is connected with the third end of the second triode Q2 and the second end of the first triode Q1, the third end of the first triode Q1 is connected with the first end of the switch module, and the control port of the switch module is connected with the second port of the comparator.
With reference to the first aspect, in one possible implementation manner, the power supply circuit further includes a first resistor R1, where a first end of the first resistor R1 is connected to the drain of the MOS transistor Q3, and a second end of the first resistor R1 is connected to the first end of the first diode D1.
With reference to the first aspect, in one possible implementation manner, the power supply circuit further includes a second resistor R2, where a first end of the second resistor R2 is connected to the second end of the first diode, and a second end of the second resistor R2 is connected to the first end of the second diode.
With reference to the first aspect, in one possible implementation manner, the diode group includes K diodes, where the K diodes are connected in series.
With reference to the first aspect, in one possible implementation manner, the power supply circuit further includes a filtering module, where,
the first end of the filtering module is connected with the first end of the second capacitor C2, and the second end of the filtering module is connected with the power supply port of the synchronous rectifier.
With reference to the first aspect, in one possible implementation manner, the power supply circuit further includes a protection module, where the protection module includes a fourth diode D4, a fifth diode D5, and a third capacitor C3, where,
the first end of the fourth diode D4 is connected to the first end of the first resistor R1, the second end of the fourth diode D4 is connected to the first end of the fifth diode D5, the second end of the fifth diode D5 is connected to the first end of the third capacitor C3, and the second end of the third capacitor C3 is grounded.
With reference to the first aspect, in one possible implementation manner, the power supply circuit further includes a temperature detection module, where the temperature detection module is configured to detect a temperature of the MOS transistor Q3.
With reference to the first aspect, in one possible implementation manner, the first resistor R1 or the second resistor R2 is a variable resistor.
A second aspect of an embodiment of the present application provides a power supply device for a synchronous rectifier, the power supply device comprising a circuit board and a power supply circuit for a synchronous rectifier as in any one of the first aspects.
A third aspect of an embodiment of the present application provides a power supply apparatus of a synchronous rectifier, the power supply apparatus comprising a housing and a power supply device of a synchronous rectifier as described in the second aspect.
The embodiment of the application has at least the following beneficial effects:
the power supply circuit of the synchronous rectifier includes: the power supply circuit comprises a first triode Q1, a second triode Q2, a first diode D1, a second diode D2, a third diode D3, a diode group, a first capacitor C1, a second capacitor C2, a switch module, a comparator and a MOS tube Q3, wherein the first end of the first diode D1 is connected with the drain electrode of the MOS tube Q3, the second end of the first diode D1 is connected with the grid electrode of the MOS tube Q3, the first end of the first triode Q1 is connected with the first end of the second diode D2, the first end of the first capacitor C1 is connected with the first end of the diode group, the source electrode of the MOS tube Q3 is connected with the second end of the first capacitor C1, the second end of the third diode D3 is connected with the drain electrode of the second diode, the second end of the second capacitor C2 is connected with the first end of the second capacitor C2, the second end of the second capacitor C2 can be connected with the second end of the second capacitor C2, and the second end of the second capacitor C2 is connected with the second end of the second capacitor C2, thereby the synchronous rectifier Q2 can be connected with the second end of the second capacitor Q2, and the synchronous rectifier Q2 is connected with the second end of the second capacitor Q2.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a power supply circuit of a synchronous rectifier according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a power supply circuit of another synchronous rectifier according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a power supply circuit of another synchronous rectifier according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a power supply circuit of another synchronous rectifier according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a power supply circuit of another synchronous rectifier according to an embodiment of the present application;
fig. 6 is a waveform of VCC start of a power supply circuit at a small duty cycle according to an embodiment of the present application;
fig. 7 is a waveform diagram of a power supply circuit in which VCC stably operates at a small duty cycle according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the described embodiments of the application may be combined with other embodiments.
Referring to fig. 1, fig. 1 is a schematic diagram of a power supply circuit of a synchronous rectifier according to an embodiment of the application. As shown in fig. 1, the power supply circuit includes:
the first triode Q1, the second triode Q2, the first diode D1, the second diode D2, the third diode D3, the diode group 10, the first capacitor C1, the second capacitor C2, the switch module 20, the comparator 30 and the MOS tube Q3, wherein,
the first end of the first diode D1 is connected with the drain electrode of the MOS transistor Q3, the second end of the first diode D1 is connected with the grid electrode of the MOS transistor Q3, the first end of the first triode Q1, the first end of the second diode D2, the first end of the first capacitor C1 and the first end of the diode group,
the source electrode of the MOS transistor Q3 is connected with the second end of the diode group, the second end of the first capacitor C1 and the first end of the third diode D3, the second end of the third diode D3 is connected with the second end of the second diode, the first end of the second capacitor C2, the first end of the second triode Q2, the first end of the comparator and the power supply port of the synchronous rectifier,
the second end of the second triode Q2 is connected with the third end of the second triode Q2 and the second end of the first triode Q1, the third end of the first triode Q1 is connected with the first end of the switch module, and the control port of the switch module is connected with the second port of the comparator.
In this example, the power supply circuit of the synchronous rectifier includes: the power supply circuit comprises a first triode Q1, a second triode Q2, a first diode D1, a second diode D2, a third diode D3, a diode group, a first capacitor C1, a second capacitor C2, a switch module, a comparator and a MOS tube Q3, wherein the first end of the first diode D1 is connected with the drain electrode of the MOS tube Q3, the second end of the first diode D1 is connected with the grid electrode of the MOS tube Q3, the first end of the first triode Q1 is connected with the first end of the second diode D2, the first end of the first capacitor C1 is connected with the first end of the diode group, the source electrode of the MOS tube Q3 is connected with the second end of the first capacitor C1, the second end of the third diode D3 is connected with the drain electrode of the second diode, the second end of the second capacitor C2 is connected with the first end of the second capacitor C2, the second end of the second capacitor C2 can be connected with the second end of the second capacitor C2, and the second end of the second capacitor C2 is connected with the second end of the second capacitor C2, thereby the synchronous rectifier Q2 can be connected with the second end of the second capacitor Q2, and the synchronous rectifier Q2 is connected with the second end of the second capacitor Q2.
In one possible implementation manner, as shown in fig. 2, the power supply circuit further includes a first resistor R1, where a first end of the first resistor R1 is connected to the drain of the MOS transistor Q3, and a second end of the first resistor R1 is connected to the first end of the first diode D1.
In one possible implementation, as shown in fig. 3, the power supply circuit further includes a second resistor R2, where a first end of the second resistor R2 is connected to the second end of the first diode, and a second end of the second resistor R2 is connected to the first end of the second diode.
In one possible implementation, as shown in fig. 3, the diode group includes K diodes, where the K diodes are connected in series. K is a preset fixed value, which is set by an empirical value or historical data.
In one possible implementation, as shown in fig. 4, the power supply circuit further includes a filtering module 40, wherein,
the first end of the filtering module 40 is connected to the first end of the second capacitor C2, and the second end of the filtering module 40 is connected to the power supply port of the synchronous rectifier.
In one possible implementation, as shown in fig. 5, the power supply circuit further includes a protection module including a fourth diode D4, a fifth diode D5, and a third capacitor C3, where,
the first end of the fourth diode D4 is connected to the first end of the first resistor R1, the second end of the fourth diode D4 is connected to the first end of the fifth diode D5, the second end of the fifth diode D5 is connected to the first end of the third capacitor C3, and the second end of the third capacitor C3 is grounded.
After the voltage at the VD position is higher than a certain threshold, the fourth diode D4 is turned on to supply power to the capacitor C3, the third capacitor C3 is charged, after the third capacitor C3 is charged and reaches the charging threshold, the fifth diode D5 can be turned on to supply power to the circuit, so that the circuit is protected, the circuit can be supplied with power, and the reliability of the circuit is improved.
In one possible implementation manner, the power supply circuit further includes a temperature detection module (not shown in the figure), where the temperature detection module is configured to detect the temperature of the MOS transistor Q3.
In one possible implementation, the first resistor R1 or the second resistor R2 is a variable resistor.
In a specific embodiment, the following describes the working principle of the power supply circuit of the synchronous rectifier according to the embodiment of the present application. The power supply circuit of fig. 3-5 is described herein as an example. In fig. 3-5, R1 is a current limiting resistor, limiting the quiescent current through R1; d1 is a diode, which prevents the grid voltage of the MOS transistor Q3 from leaking to VD when VD is low; the MOS tube Q3 is a high-voltage power tube and is used for withstanding voltage and generating charging current Ic; DM is a diode string, and is mainly used for generating the grid voltage of the basically constant MOS tube Q3 so as to make the charging current Ic constant; d3 is a diode to prevent VCC from leaking to VD when VD is low; c2 is an energy storage capacitor, stores energy when VD is high potential charging, and supplies power for the synchronous rectifier when VD is low; d2 is a diode, preventing VA from leaking electricity to VCC, R2 is a limiting resistor, limiting current when VCC supplies power to VA, C1 is a capacitor of a charge pump, D2, R2, C1, DM and MOS transistor Q3 together form the charge pump, so that gate-source voltage of MOS transistor Q3 is always kept at Vth (DM), so that VD can be charged rapidly when VD is high potential; a comparator 30, hysteresis Vhys, mainly for maintaining the VCC voltage around VREF; q1 and Q2 form clamping circuits that clamp VA highest voltage near VCC when switching module 20 pulls VA down. In order to clearly illustrate the working principle, the following will explain from two stages of start-up and stable operation.
(1) And a starting stage. When the voltage is started, the VCC voltage is the ground potential VSS, so VA cannot be charged through the charge pump, VA can only be charged through paths of R1 and D1, and the charging current is as follows:
IR1＝(VD-VA-Vth(D1))/R1(3.1)
where Vth (D1) is the on threshold of D1. When VD is high, the current represented by the formula (3.1) is C1, and when VD is low, VA is not changed due to unidirectional conduction characteristics of D1, and leakage current to VD is not generated, so that VA voltage gradually increases. After a plurality of periods, the VA voltage rises to the on threshold Vth of the MOS transistor Q3, the MOS transistor Q3 will be turned on, the VCC voltage starts to rise, and thereafter, in the VD low potential period, VCC also charges VA, so that the starting speed is further increased. When VA voltage continues to rise, the gate-source voltage of the MOS transistor Q3 will be clamped to Vth (DM), and when VD is high, the charging current Ic remains substantially unchanged, and VCC will also continue to rise. When VCC rises to VREF, it represents the end of start-up, and enters a steady operation phase.
Fig. 6 is a VCC start waveform for the self-powered circuit of the present application at a small duty cycle. As can be seen from fig. 6, the VA voltage is low at the start, the high potential period of each cycle of VDS (VD versus VSS voltage) is charged by the current shown in formula (3.1), and the low potential period of VDS is gradually increased due to the constant unidirectional conduction characteristic of D1, and VCC is low; after a plurality of periods, VA rises to the opening threshold Vth of the MOS tube Q3, at the moment, ic starts to have current, VCC voltage rises, at the moment, besides the fact that the VA charges the high potential period of each period of VDS through the current shown by the formula (3.1), the VA charges the low potential period VCC of each period of VDS, namely, a charge pump starts to work, so that VA rises fast, and charging current Ic also continuously increases; when VA rises to Vth (DM) +vth (D2) +vcc, the gate-source voltage of the MOS transistor Q3 will remain Vth (DM), the charging period of the charging current Ic will remain unchanged every cycle, and VCC continues to rise; when VA rises to Vth (DM) +vth (D2) +vref, that is, VCC rises to VREF, the comparator output ENDN jumps to high, the highest voltage of VA will be clamped at VCC, and the MOS transistor Q3 is turned off in the high potential period of VDS, and the starting process ends at this time.
(2) And stabilizing the working stage. After entering the steady state operation phase, if VCC is less than VREF-Vhys, then circuitry is required to continue charging VCC. When VDS is at low potential in one period, VB voltage is low because MOS transistor Q3 is on, VCC charges C1 through D3 and R2 to maintain the gate-source voltage of MOS transistor Q3 at Vth (DM); when VDS is high, the voltage VB increases, and the voltage VA also increases because the voltage difference across the capacitor cannot be suddenly changed, and the gate-source voltage of the MOS transistor Q3 (i.e., the voltage difference across the capacitor C1) will remain Vth (DM), so the charging current Ic will rapidly rise and remain unchanged, and VCC rises. It can be seen that the small duty cycle of VDS and the high potential voltage magnitude do not impose limitations.
After a number of cycles, when VCC rises to VREF, comparator 30 output ENDN jumps high, turning on switching module 20 to discharge VA, in order to prevent VA from undergoing a long rise process when VCC is recharged, where discharge of VA through Q1 and Q2 is voltage clamped. The base potential of Q1 is:
VC＝VCC-Vth(Q2)(3.2)
wherein Vth (Q2) is the on threshold voltage of the second transistor Q2, and when the switch module 20 is turned on, the VA voltage required for the first transistor Q1 to be turned on is:
vc=vcc-Vth (Q2) +vth (Q1) is about VCC (3.3)
Wherein Vth (Q1) is the on threshold voltage of the first transistor Q1 and is approximately equal to the on threshold voltage Vth (Q2) of the second transistor Q2, so that when VA falls below VCC, the first transistor Q1 will be turned off, i.e., the highest voltage of VA is clamped near VCC. Thus, when VDS is at high potential, since VA is clamped at VCC, MOS transistor Q3 is not turned on, and no charging current Ic is applied, when VDS is at low potential, VCC is still supplied with power from C1, so that the gate-source voltage of MOS transistor Q3 is kept at Vth (DM), and VCC is gradually reduced due to internal power consumption of synchronous rectification. When the VCC voltage drops below VREF-Vhys, VCC needs to be charged again, and when VDS is at low voltage, the gate-source voltage of the MOS transistor Q3 is Vth (DM), so when VDS is at high voltage, VA will quickly rise and generate a constant charging current Ic to charge VCC until VCC rises again to VREF, and the above process is repeated.
Fig. 7 is a waveform diagram of the self-powered circuit of the present application when VCC is operating stably at a small duty cycle. As can be seen in fig. 7, the self-powered circuit needs to charge VCC when the VCC voltage is below VCC-Vhys. When the VDS voltage is low, the voltage of VA is equal to the gate voltage of the MOS transistor Q3 and is kept at Vth (DM); when the VDS voltage is high, since the voltages on both sides of the C1 capacitor cannot be suddenly changed, the VA voltage rapidly rises and keeps the gate voltage of the MOS transistor Q3 Vth (DM), so that a constant charging current Ic is rapidly generated and the VCC voltage increases. After a number of cycles, after the VCC voltage is higher than VREF, the output ENDN of COMP will transition high and switch module 20 turns on clamping the highest voltage of VA. At this time, when VDS is high, the voltage clamp of VA is positioned at VCC, so that the MOS tube Q3 is not conducted, and Ic is not generated; when VDS is low, VCC supplies power to VA to keep the gate-source voltage of MOS transistor Q3 at Vth (DM). Because no charging current exists in the whole period, the internal power consumption of synchronous rectification can lead to the slow reduction of VCC, and when the internal power consumption of synchronous rectification is reduced to be lower than VREF-Vhys, the VCC can be charged again, and the previous process is repeated.
It should be noted that, for simplicity of description, the foregoing method embodiments are all described as a series of acts, but it should be understood by those skilled in the art that the present application is not limited by the order of acts described, as some steps may be performed in other orders or concurrently in accordance with the present application. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all preferred embodiments, and that the acts and modules referred to are not necessarily required for the present application.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
In the several embodiments provided by the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, such as the division of the units, merely a logical function division, and there may be additional manners of dividing the actual implementation, such as multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, or may be in electrical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units described above may be implemented either in hardware or in software program modules.
The foregoing has outlined rather broadly the more detailed description of embodiments of the application, wherein the principles and embodiments of the application are explained in detail using specific examples, the above examples being provided solely to facilitate the understanding of the method and core concepts of the application; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.

Claims (10)

1. A power supply circuit for a synchronous rectifier, the power supply circuit comprising: a first triode Q1, a second triode Q2, a first diode D1, a second diode D2, a third diode D3, a diode group, a first capacitor C1, a second capacitor C2, a switching circuit, a comparator and a MOS tube Q3, wherein,
the first end of the first diode D1 is connected with the drain electrode of the MOS transistor Q3, the second end of the first diode D1 is connected with the grid electrode of the MOS transistor Q3, the first end of the first triode Q1, the first end of the second diode D2, the first end of the first capacitor C1 and the first end of the diode group,
the source electrode of the MOS transistor Q3 is connected with the second end of the diode group, the second end of the first capacitor C1 and the first end of the third diode D3, the second end of the third diode D3 is connected with the second end of the second diode, the first end of the second capacitor C2, the first end of the second triode Q2, the first end of the comparator and the power supply port of the synchronous rectifier,
the second end of the second triode Q2 is connected with the third end of the second triode Q2 and the second end of the first triode Q1, the third end of the first triode Q1 is connected with the first end of a switching circuit, and the control port of the switching circuit is connected with the second port of the comparator.
2. The power supply circuit according to claim 1, further comprising a first resistor R1, wherein a first end of the first resistor R1 is connected to the drain of the MOS transistor Q3, and a second end of the first resistor R1 is connected to the first end of the first diode D1.
3. The power supply circuit of claim 1, further comprising a second resistor R2, wherein a first terminal of the second resistor R2 is connected to a second terminal of the first diode D1, and a second terminal of the second resistor R2 is connected to a first terminal of the second diode D2.
4. A power supply circuit according to any of claims 1-3, characterized in that the diode group comprises K diodes, wherein the K diodes are connected in series.
5. The power supply circuit of claim 4, further comprising a filter circuit, wherein,
the first end of the filter circuit is connected with the first end of the second capacitor C2, and the second end of the filter circuit is connected with the power supply port of the synchronous rectifier.
6. The power supply circuit of claim 5, wherein the power supply circuit comprises a power supply circuit,
the power supply circuit further comprises a protection circuit comprising a fourth diode D4, a fifth diode D5, a third capacitor C3, wherein,
the first end of the fourth diode D4 is connected to the first end of the first resistor R1, the second end of the fourth diode D4 is connected to the first end of the fifth diode D5, the second end of the fifth diode D5 is connected to the first end of the third capacitor C3, and the second end of the third capacitor C3 is grounded.
7. The power supply circuit of claim 6, further comprising a temperature detection circuit, wherein the temperature detection circuit is configured to detect a temperature of the MOS transistor Q3.
8. The power supply circuit according to any one of claims 1 to 7, wherein the first resistor R1 or the second resistor R2 is a variable resistor.
9. A power supply device of a synchronous rectifier, characterized in that the power supply device comprises a circuit board and a power supply circuit of a synchronous rectifier according to any one of claims 1-8.
10. A synchronous rectifier power supply apparatus, characterized in that the power supply apparatus comprises a housing and a synchronous rectifier power supply device as claimed in claim 9.
CN202211038682.6A 2022-04-22 2022-04-22 Power supply circuit of synchronous rectifier, power supply device and power supply equipment Pending CN116979819A (en)

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Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101572485B (en) * 2008-04-30 2012-06-06 杭州茂力半导体技术有限公司 Intelligent driving control method and device for secondary synchronous rectifier
EP2355326A1 (en) * 2009-09-30 2011-08-10 Imec Synchronous rectifier circuit
JP5768657B2 (en) * 2011-10-26 2015-08-26 富士電機株式会社 DC-DC converter
US9735694B2 (en) * 2015-06-19 2017-08-15 Sanken Electric Co., Ltd. Integrated circuit and switching power-supply device with charging control circuit
CN206640515U (en) * 2017-03-01 2017-11-14 东莞市优琥电子科技有限公司 A kind of synchronous rectification self-powered circuit
US10277107B1 (en) * 2017-12-27 2019-04-30 Stmicroelectronics S.R.L. Synchronous rectifier gate driver with active clamp
TWI675540B (en) * 2018-06-29 2019-10-21 力林科技股份有限公司 Power conversion apparatus with low power consumption and low cost
US10985666B2 (en) * 2018-07-31 2021-04-20 Astec International Limited Voltage supply for synchronous rectifier controller during low voltage output conditions
CN108900096B (en) * 2018-09-07 2023-07-14 大山科技有限公司 Synchronous rectification power supply circuit with absorption function
CN110855131B (en) * 2019-12-09 2021-10-15 成都芯源系统有限公司 Drive circuit of synchronous rectifier
CN213990523U (en) * 2020-11-13 2021-08-17 广州金升阳科技有限公司 Synchronous rectifying device
CN113179032B (en) * 2021-04-29 2024-05-03 基合半导体（宁波）有限公司 Synchronous rectification controller, control method and adapter
CN113193771B (en) * 2021-06-30 2021-09-10 深圳英集芯科技股份有限公司 Minimum opening time self-adaptive circuit and method of full-bridge synchronous rectification circuit
CN113364304B (en) * 2021-08-10 2022-06-14 深圳市力生美半导体股份有限公司 Synchronous rectification sampling control circuit, method and chip
CN216216520U (en) * 2021-09-09 2022-04-05 无锡博通微电子技术有限公司 High-voltage power supply control system for synchronous rectification
CN114531014B (en) * 2022-04-22 2022-07-19 深圳英集芯科技股份有限公司 Power supply circuit, device and equipment of synchronous rectifier

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