CN209659177U - Synchronous rectification switch converter - Google Patents
Synchronous rectification switch converter Download PDFInfo
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- CN209659177U CN209659177U CN201821947952.4U CN201821947952U CN209659177U CN 209659177 U CN209659177 U CN 209659177U CN 201821947952 U CN201821947952 U CN 201821947952U CN 209659177 U CN209659177 U CN 209659177U
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Abstract
The utility model proposes a kind of synchronous rectification switch converters.The synchronous rectification switch converter includes: main circuit, including main switch and rectifier switch pipe, the main switch and rectifier switch pipe conducting complimentary to one another and disconnection, for DC input voitage to be converted into DC output voltage；And control circuit, it is connected with the main circuit, for providing first switch control signal and second switch control signal respectively to main switch and rectifier switch pipe, wherein, the control circuit generates the first internal supply voltage using the DC input voitage during starting, first internal supply voltage is generated using the first external power supply voltage after start-up, the first external power supply voltage is less than the DC input voitage.The in-line power mode of the control circuit of the synchronous rectification switch converter uses new framework, and feeder ear is transferred to low-voltage output from high voltage input terminal after start-up, to reduce power consumption, improves system effectiveness.
Description
Technical field
The utility model relates to power electronic technique, and in particular, to a kind of synchronous rectification switch converter.
Background technique
Switch converters are the core components that transformation of electrical energy is realized in modern electronic equipment.The control module of switch converters
The pulse signal for generating predetermined duty ratio, controls the time ratio of the turn-on and turn-off of main switch, to maintain output voltage
And/or electric current is stablized.In the output stage of switch converters, rectified using diode pair pulse signal, using output capacitance to arteries and veins
It rushes signal to be filtered, to obtain smooth DC output voltage.The loss of switch converters mainly includes the damage of main switch
It consumes, the loss of transformer loss and rectifier diode.In switching converter operation when low-voltage, High-current output state, two
The conduction voltage drop of pole pipe is relatively high, causes rectifier loss excessively high.
In order to improve the efficiency of switch converters, synchronous rectification can be used, wherein replace using rectifier switch pipe
Diode, the rectifier switch pipe and main switch synchronously switched conductive and off-state, to be rectified to pulse signal.
The conducting resistance of rectifier switch pipe is very low, so as to reduce rectifier loss.In synchronous rectification, control circuit provides master
The switch control signal of switching tube and rectifier switch pipe is adopted to realize using the electric energy transmission of main switch control main circuit
The switching process of output stage processed is managed with rectifier switch.The power supply of control circuit itself comes from DC input voitage VIN, through too low
Pressure difference linear voltage regulator generates lower supply voltage VDD.
In high-power applications, main switch and rectifier switch pipe are for example N-type MOS (metal-oxide semiconductor (MOS)) function
Rate pipe.Control circuit needs power supply of booting to the driving of main switch, and the voltage of bootstrapping power supply results from supply voltage VDD.
Control circuit reaches several milliamperes for the drive part static current of lcd of main switch, even higher, as a result leads to control circuit
Power consumption is excessive, so that the efficiency of switch converters reduces.
Therefore, it is desirable to be further improved in synchronous rectification switch converter and be to improve for the power supply circuit of control circuit
System efficiency.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of synchronous rectification switch converters, wherein utilize synchronization
Rectifier output voltage provides supply voltage for internal controller, to reduce the power consumption of control circuit to improve switch converters
System effectiveness.
It is according to the present utility model in a first aspect, providing a kind of synchronous rectification switch converter, comprising: main circuit, including
Main switch and rectifier switch pipe, the main switch and rectifier switch pipe conducting complimentary to one another and disconnection, being used for will be straight
Stream input voltage is converted into DC output voltage；And control circuit, be connected with the main circuit, for main switch and
Rectifier switch pipe provides first switch control signal and second switch control signal respectively, wherein the control circuit is starting
Period generates the first internal supply voltage using the DC input voitage, is produced after start-up using the first external power supply voltage
Raw first internal supply voltage, the first external power supply voltage are less than the DC input voitage.
Preferably, the control circuit includes: power supply module, receives the DC input voitage and first outside supplies
Piezoelectric voltage generates the first supply voltage and the second supply voltage respectively, and first supply voltage and described second is supplied
One of piezoelectric voltage is used as first internal supply voltage；And first control module and the second control module, respectively with it is described
Power supply module is connected, to obtain first internal supply voltage, and generate respectively first switch control signal and
The second switch controls signal.
Preferably, the power supply module includes for receiving the first input end of the DC input voitage, for receiving
Second input terminal of the first external power supply voltage and the output end of offer first internal supply voltage, the confession
Electric module further include: selector, for selecting one of first supply voltage and second supply voltage；First pressure stabilizing mould
Block is connected between the first input end and the selector；And second Voltage stabilizing module, it is connected to second input terminal
Between the selector.
Preferably, when second supply voltage meets the circuit element demand inside the control circuit, the choosing
It selects device and disables first Voltage stabilizing module.
Preferably, the power supply circuit further include: under-voltage detection module is connected to second input terminal and described first
Between Voltage stabilizing module, wherein when the first external power supply voltage is less than predetermined reference value, the under-voltage detection module is again
Enable first Voltage stabilizing module.
Preferably, second input terminal is connected to the output end of the main circuit, to receive the DC output voltage,
The power supply module is using the DC output voltage as the first external power supply voltage.
It preferably, further include the first capacitor being connected between second input terminal and ground.
Preferably, the control circuit includes: power supply module, receives the DC input voitage, first outside supplies
Piezoelectric voltage and the second external power supply voltage generate the first supply voltage using the DC input voitage, outside described first
Portion's supply voltage generates the second supply voltage, will one of first supply voltage and second supply voltage conduct described the
One internal supply voltage, and the second internal supply voltage is generated using the second external power supply voltage；And first control
Module and the second control module, are connected with the power supply module respectively, to obtain first internal supply voltage and described
Second internal supply voltage, and the first switch control signal and second switch control signal are generated respectively.
Preferably, the power supply module includes for receiving the first input end of the DC input voitage, for receiving
Second input terminal of the first external power supply voltage, mentions the third input terminal for receiving the second external power supply voltage
For first internal supply voltage the first output end, provide second internal supply voltage second output terminal and
It is connected to the floating ground terminal of the intermediate node of the main switch and the rectifier switch pipe, the power supply module further include: high pressure
Starting module is connected between the first input end and the floating ground terminal, for generating first supply voltage；Selection
Device is connected to second input terminal and the floating ground terminal, using the first external power supply voltage as second power supply
Voltage selects one of first supply voltage and second supply voltage as first internal supply voltage, and
First internal supply voltage is provided in first output end；And Voltage stabilizing module, be connected to the third input terminal and
Between the second output terminal, second internal supply voltage is generated using the second external power supply voltage.
Preferably, second input terminal and the third input terminal are connected to the output end of the main circuit, to receive
The DC output voltage, the power supply module is using the DC output voltage as the first external power supply voltage and described
Second external power supply voltage.
Preferably, further includes: diode, the anode of the diode are connected to the output end of the main circuit, and cathode connects
It is connected to second input terminal；And first capacitor, it is connected between second input terminal and the floating ground.
Preferably, further includes: the second capacitor is connected between the third input terminal and ground.
Preferably, the main switch and the rectifier switch pipe are connected in series in the input terminal and ground of the main circuit
Between, the main circuit further include: inductance, be connected to the main switch and the rectifier switch pipe intermediate node and the master
Between the output end of circuit；And output capacitance, it is connected between the output end and ground of the main circuit.
Preferably, the main switch and the rectifier switch pipe are respectively to be selected from metal oxide semiconductor field-effect
Pipe, insulated gate bipolar transistor and bipolar transistor it is any.
Second aspect according to the present utility model provides a kind of control method for synchronous rectification switch converter, institute
The main circuit for stating synchronous rectification switch converter includes main switch and rectifier switch pipe, and the control method includes: generation
One internal supply voltage；The power supply of control circuit is carried out, using the first internal supply voltage to generate first switch control signal
Signal is controlled with second switch；The on state of the main switch is controlled using first switch control signal；And it adopts
The on state that the rectifier switch pipe is controlled with second switch control signal, so that the main switch and the rectification
Switching tube conducting complimentary to one another and disconnection, for DC input voitage to be converted into DC output voltage, wherein in the starting period
Between, first internal supply voltage is generated using DC input voitage, after start-up, is produced using the first external power supply voltage
Raw first internal supply voltage, the first external power supply voltage are less than the DC input voitage.
Preferably, the step of the first internal supply voltage of the generation includes: to generate the using the DC input voitage
One supply voltage；Second supply voltage is generated using the first external power supply voltage；And selection first supply voltage
First internal supply voltage is used as with one of second supply voltage.
Preferably, when second supply voltage meets the circuit element demand inside the control circuit, disabling is produced
The function of raw first supply voltage.
Preferably, when the first external power supply voltage is less than predetermined reference value, generation the first power supply electricity is reactivated
The function of pressure.
Preferably, using the DC output voltage as the first external power supply voltage.
Preferably, the step of the first internal supply voltage of the generation includes: to generate the using the DC input voitage
One supply voltage；Second supply voltage is generated using the first external power supply voltage；And selection first supply voltage
First internal supply voltage is used as with one of second supply voltage.
Preferably, further includes: the second internal supply voltage is generated using the second external power supply voltage.
Preferably, using the DC output voltage as the first external power supply voltage and second external power supply electricity
Pressure.
Preferably, the main switch and the rectifier switch pipe are respectively to be selected from metal oxide semiconductor field-effect
Pipe, insulated gate bipolar transistor and bipolar transistor it is any.
According to the synchronous rectification switch converter of the utility model embodiment, the in-line power mode of control circuit is using new
Framework, the feeder ear of control circuit obtains static current of lcd from high voltage input terminal during starting, after start-up control circuit
Feeder ear be transferred to low-voltage output from high voltage input terminal, to reduce power consumption, improve system effectiveness.
Detailed description of the invention
By referring to the drawings to the description of the utility model embodiment, above-mentioned and other mesh of the utility model
, feature and advantage will be apparent from.
Fig. 1 shows the schematic block diagram of synchronous rectification switch converter control circuit according to prior art.
Fig. 2 shows the schematic frames according to the synchronous rectification switch converter control circuit of the utility model first embodiment
Figure.
Fig. 3 shows the schematic block diagram of the synchronous rectification switch converter according to the utility model second embodiment.
Voltage stabilizing module, selector and under-voltage inspection in synchronous rectification switch converter shown in Fig. 3 is shown respectively in Fig. 4 a to 4c
Survey the schematic circuit of module.
Fig. 5 shows the schematic block diagram of the synchronous rectification switch converter according to the utility model 3rd embodiment.
Fig. 6 shows the schematic circuit of the Voltage stabilizing module in synchronous rectification switch converter shown in Fig. 5.
Specific embodiment
Hereinafter reference will be made to the drawings is more fully described the various embodiments of the utility model.In various figures, identical
Element is indicated using same or similar appended drawing reference.For the sake of clarity, the various pieces in attached drawing are not drawn to draw
System.
In this application, switching tube is to provide the transistor of current path on state, including be selected from metal oxide
Semiconductor field, insulated gate bipolar transistor and bipolar transistor it is any.The first end and second end of switching tube point
Be not the hot end and cold end on current path, control terminal for receive driving signal with the conducting of control switch pipe and
Shutdown.
The present invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 shows the schematic block diagram of synchronous rectification switch converter control circuit according to prior art.In Fig. 1 not
The main circuit of synchronous rectification switch converter is shown.The main circuit includes main switch and rectifier switch pipe, for direct current is defeated
Enter voltage VIN and is converted into DC output voltage VOUT.Control circuit 100 includes power supply module 110,120 and of the first control module
Second control module 130.
Power supply module 110 includes Voltage stabilizing module 111, e.g. low pressure difference linear voltage regulator (LDO).Voltage stabilizing module 111 connects
DC input voitage VIN is received, and generates the lower supply voltage VDD of voltage value.
First control module 120 and the second control module 130 are connected with power supply module 110, to obtain supply voltage
VDD.First control module 120 and the second control module 130 for example respectively include feedback control loop, error amplifying circuit, logic electricity
Road and driving circuit generate first switch control signal VG1 and second switch according to the feedback signal of DC output voltage VOUT
Control signal VG2.
The control circuit 100 generates supply voltage VDD using DC input voitage, and first for main switch controls mould
The static current of lcd of block 120 reaches several milliamperes, even higher, as a result causes the power consumption of control circuit excessive, so that switch converters
Efficiency reduce.
Fig. 2 shows the schematic frames according to the synchronous rectification switch converter control circuit of the utility model first embodiment
Figure.The main circuit of synchronous rectification switch converter is not shown in Fig. 2.As described below, the main circuit include main switch and
Rectifier switch pipe, for DC input voitage VIN to be converted into DC output voltage VOUT.Control circuit 200 includes power supply mould
Block 210, the first control module 220 and the second control module 230.
Power supply module 210 includes the first Voltage stabilizing module 211, the second Voltage stabilizing module 212 and selector 213.First pressure stabilizing
Module 211 is, for example, low pressure difference linear voltage regulator (LDO).The first input end of power supply module 210 receives DC input voitage
VIN, the second input terminal receive external power supply voltage VCC, and output end provides internal supply voltage.
In power supply module 210, the first Voltage stabilizing module 211 receives DC input voitage VIN, and it is lower to generate voltage value
The first supply voltage VDD1.Second Voltage stabilizing module 212 is, for example, low pressure difference linear voltage regulator (LDO).Second Voltage stabilizing module 212
External power supply voltage VCC is received, and generates the lower second supply voltage VDD2 of voltage value.Selector 213 and the first pressure stabilizing
Module 211 is connected with the second Voltage stabilizing module 212, receives the first supply voltage VDD1 and the second supply voltage VDD2 respectively, and
And select one as internal supply voltage VDD.
First control module 220 and the second control module 230 are connected with power supply module 210, to obtain in-line power electricity
Press VDD.First control module 220 and the second control module 230 for example respectively include feedback control loop, error amplifying circuit, logic
Circuit and driving circuit generate first switch control signal VG1 and second according to the feedback signal of DC output voltage VOUT and open
Close control signal VG2.At least part circuit element of first control module 220 and the second control module 230 needs internal supply
Piezoelectric voltage VDD could be worked normally.
During starting, system electrification.Power supply module 210 in control circuit 200 obtains DC input voitage VIN, the
One Voltage stabilizing module 211 generates the first supply voltage VDD1.After start-up, the power supply module 210 in control circuit 200 can be with
External power supply voltage VCC is obtained, the second Voltage stabilizing module 212 generates the second supply voltage VDD2 according to external power supply voltage VCC.It should
External power supply voltage VCC is less than DC input voitage VIN, but is greater than and control circuit 200 is maintained to work normally required inside confession
Piezoelectric voltage VDD.
In this application, external power supply voltage VCC indicates the DC voltage obtained outside control circuit 200, e.g.
The DC output voltage VOUT of output stage from switch converters.Internal supply voltage VDD indicates to be used for control circuit 200
Supply voltage needed for the normal work of internal circuit element (such as error amplifying circuit, logic circuit and driving circuit).
Selector 213 detects the first supply voltage VDD1 and the second supply voltage VDD2.In the first supply voltage VDD1 and
When one of second supply voltage VDD2 is effective, selector 213 selects the effective supply voltage as internal supply voltage VDD.
In the first supply voltage VDD1 and the second supply voltage VDD2 effective, selector 213 selects the second supply voltage VDD2 to make
For internal supply voltage VDD.Since the external power supply voltage VCC for generating the second supply voltage VDD2 is less than for generating the
The DC input voitage VIN of one supply voltage VDD1, therefore, using the second supply voltage VDD2 as internal supply voltage VDD
When, it can reduce the power consumption of the first control module 220 and the second control module 230.
It should be noted that the second Voltage stabilizing module 212 is preferred circuit module, external power supply voltage VCC is depended primarily on
Whether the requirement of first control module 220 and second control module 230 can directly be met.If met the requirements, can save
Second Voltage stabilizing module 212 directlys adopt external power supply voltage VCC and is powered as internal supply voltage.
Preferably, when selector 213 selects the second supply voltage VDD2 as internal supply voltage, selector 213 is prohibited
It is further decreased power consumption so that the first Voltage stabilizing module 211 is stopped working with the first Voltage stabilizing module 211 and system effectiveness is provided.
Preferably, power supply module 210 further includes under-voltage detection module 214, for detecting external power supply voltage VCC.This is owed
Pressure detection module 214 is connected with the first Voltage stabilizing module 211.Further, which receives external power supply electricity
VCC is pressed, when the external power supply voltage VCC is less than predetermined reference value, under-voltage detection module 214 reactivates the first pressure stabilizing mould
Block 211 is to generate the first supply voltage VDD1.Selector 213 selects the first supply voltage VDD1 as internal supply voltage.
Control circuit according to this embodiment, power supply module select one from DC input voitage and external power supply voltage
Internal supply voltage is generated, when external supply voltage can satisfy the circuit element demand inside control circuit, using outside
Supply voltage generates internal supply voltage.The external power supply voltage is less than DC input voitage, thus using external power supply electricity
The power consumption of control circuit itself can be saved when pressure and system effectiveness is provided.
Fig. 3 shows the schematic block diagram of the synchronous rectification switch converter according to the utility model second embodiment.This is same
Walking rectifier switch converter 300 includes main circuit and control circuit.
As shown, synchronous rectification switch converter 300 is high pressure buck synchronous rectification topology.Main circuit includes main switch
Pipe M1 and rectifier switch pipe M2, inductance L1 and output capacitance Co.Main switch M1 and rectifier switch pipe M2 are connected in series in input
Between end and ground.Inductance L1 is connected to the intermediate node of main switch M1 and rectifier switch pipe M2 and the first end of output capacitance Co
Between, the second end of output capacitance Co is grounded.DC output voltage VOUT is provided at the both ends of output capacitance Co.
Control circuit 200 includes power supply module 210, the first control module 220 and the second control module 230.Power supply module
210 first input end is connected with the input terminal of synchronous rectification switch converter 300, to obtain DC input voitage VIN, the
Two input terminals are connected with the output end of synchronous rectification switch converter 300, to obtain DC output voltage VOUT, as power supply
The external power supply voltage VCC of module 210.
During starting, system electrification.The control circuit of synchronous rectification switch converter 300 can only obtain direct current input electricity
Press VIN.Power supply module 210 in control circuit generates the first supply voltage VDD1 according to DC input voitage VIN, as control
The internal supply voltage VDD of circuit.The first control module 220 and the second control module 230 in control circuit obtain internal confession
It starts to work after piezoelectric voltage VDD, first switch control signal VG1 is provided respectively and second switch controls signal VG2, thus into
Enter normal operating conditions.
During normal work after start-up, the main switch M1 and rectifier switch of synchronous rectification switch converter 300
Pipe M2 complementation conducting and disconnection.In main switch conducting phase, rectifier switch pipe M2 is disconnected, and DC input voitage VIN is via opening
It closes pipe M1 to charge to inductance L1 and output capacitance Co, and to load supplying.In the main switch M1 disconnected phase, rectifier switch pipe
M2 conducting, inductance L1 charge to capacitor Co via rectifier switch pipe M2, and to load supplying.Output capacitance Co is flat for obtaining
Sliding DC voltage.The DC output voltage VOUT of the synchronous rectification switch converter 300 is less than DC input voitage VIN.
The control circuit of synchronous rectification switch converter 300 can obtain DC input voitage VIN and direct current output simultaneously
Voltage VOUT.Power supply module 210 in control circuit generates the second supply voltage VDD2 according to DC output voltage VOUT, as
The internal supply voltage VDD of control circuit.In the first control module 220 and the second control module 230 in control circuit obtain
It starts to work after portion supply voltage VDD, first switch control signal VG1 is provided respectively and second switch controls signal VG2, from
And maintain normal operating conditions.
Synchronous rectification switch converter according to this embodiment generates control according to DC input voitage VIN during starting
The internal supply voltage of circuit processed generates the in-line power of control circuit according to DC output voltage VOUT during normal operation
Voltage.Since DC output voltage VOUT is less than DC input voitage, control circuit can be reduced during normal operation
The power consumption of itself, to provide system effectiveness.Preferably, the first pressure stabilizing mould in power supply module is disabled during normal operation
Block, to further decrease the power consumption of control circuit itself.Since switch converters efficiency itself is very high, it is equivalent to synchronization
The electric current of the input terminal of rectifier switch converter is very small, thus whole efficiency significantly improves.
Voltage stabilizing module, selector and under-voltage inspection in synchronous rectification switch converter shown in Fig. 3 is shown respectively in Fig. 4 a to 4c
Survey the schematic circuit of module.
The circuit structure of Voltage stabilizing module 212 and 211 is identical, is illustrated by taking Voltage stabilizing module 211 as an example.Voltage stabilizing module 211
E.g. low pressure difference linear voltage regulator (LDO), including operational amplifier AMP, transistor M11, resistance R11 and R12.Operation amplifier
The non-inverting input terminal of device AMP receives reference voltage VBG, and reversed-phase output receives the feedback signal of the first supply voltage VDD1, defeated
Outlet is connected to the control terminal of transistor M11.Transistor M11, resistance R11 and R12 are connected in series in DC input voitage VIN's
Between input terminal and ground.There is provided the first supply voltage VDD1 in the intermediate node of transistor M11 and resistance R11, in resistance R11 and
The intermediate node of R12 provides the feedback signal of the first supply voltage VDD1.The Voltage stabilizing module 211 maintains first using feedback control loop
Supply voltage VDD1 is pressure stabilizing output.
Selector 213 includes diode D31 and D32, and the anode of the two receives the first supply voltage VDD1 and second respectively
Supply voltage VDD2, cathode are connected to common node to provide internal supply voltage VDD.
Under-voltage detection module 214 includes comparator CMP, resistance R41 and R42.Resistor R41 and R42 are connected in series outside
Between the input terminal and ground of portion supply voltage VCC, to obtain the sampled signal of external power supply voltage VCC.The same phase of comparator CMP
Input terminal receives sampled signal, and inverting input terminal receives reference signal VREF, and output end provides switching signal VSW.It is supplied in outside
When piezoelectric voltage VCC is less than predetermined reference value, the signal that under-voltage detection module 214 generates is for reactivating Voltage stabilizing module 211.
Fig. 5 shows the schematic block diagram of the synchronous rectification switch converter according to the utility model 3rd embodiment.This is same
Walking rectifier switch converter 400 includes main circuit and power supply module 410.Control circuit includes that power supply module 410, first controls mould
Block 420 and the second control module 430.
As shown, synchronous rectification switch converter 400 is the high pressure buck synchronous rectification topology on floating ground.Main circuit includes
Main switch M1 and rectifier switch pipe M2, inductance L1 and output capacitance Co.Main switch M1 and rectifier switch pipe M2 is connected in series
Between input terminal and ground.Inductance L1 is connected to the intermediate node and output capacitance Co of main switch M1 and rectifier switch pipe M2
Between first end, the second end of output capacitance Co is grounded.DC output voltage VOUT is provided at the both ends of output capacitance Co.
Synchronous rectification switch converter 400 further includes diode D1, capacitor C1 and C2.
The first end of capacitor C1 is connected to an input terminal of power supply module 410, second end be connected to main switch M1 and
The intermediate node of rectifier switch pipe M2.The anode of diode D1 is connected to the first end of output capacitance Co, and cathode is connected to capacitor
The first end of C1.During normal operation, DC output voltage VOUT is provided to capacitor C1 via diode D1, filters through capacitor C1
Smooth DC voltage is generated after wave, the first external power supply voltage VCC1 as power supply module 410.
The first end of capacitor C2 is connected to an input terminal of power supply module 410, second end ground connection, DC output voltage
VOUT is provided to capacitor C2, generates smooth DC voltage after capacitor C2 filtering, and the second outside as power supply module 410 supplies
Piezoelectric voltage VCC2.
Power supply module 410 includes high voltage startup module 411, Voltage stabilizing module 412 and selector 413.The of power supply module 410
One input terminal receives DC input voitage VIN, and the second input terminal receives the first external power supply voltage VCC1, and third input terminal receives
Second external power supply voltage VCC2, output end provide internal supply voltage VDD and VDD3.Power supply module 410 further includes floating ground terminal,
It is connected to the intermediate node of main switch M1 and rectifier switch pipe M2.High voltage startup module 411 is connected to first input end and floats
Between ground terminal.Voltage stabilizing module 412 is connected between third input terminal and the second control module 430.
During starting, power supply module 410 generates first from DC input voitage VIN using high voltage startup module 411 and supplies
Piezoelectric voltage VDD1.During normal work after start-up, power supply module 410 generates second using DC output voltage VOUT and supplies
Piezoelectric voltage VDD2.Selector 413 receives the first supply voltage VDD1 and the second supply voltage VDD2 respectively, and one is selected to make
For internal supply voltage VDD.After start-up, Voltage stabilizing module 412 is just started to work, and Voltage stabilizing module 412 is using direct current output electricity
VOUT is pressed to generate third supply voltage VDD3.
First control module 420 is connected with selector 413, to obtain internal supply voltage VDD.First control module
420 for example respectively include feedback control loop, error amplifying circuit, logic circuit and driving circuit, according to DC output voltage VOUT
Feedback signal generate first switch control signal VG1.At least part circuit element of first control module 420 needs inside
Supply voltage VDD could be worked normally.
Second control module 430 is connected with Voltage stabilizing module 412, to obtain third supply voltage VDD3, supplies as inside
Piezoelectric voltage.Second control module 430 for example respectively includes feedback control loop, error amplifying circuit, logic circuit and driving circuit, root
Second switch, which is generated, according to the feedback signal of DC output voltage VOUT controls signal VG2.At least one of second control module 430
Parallel circuit element needs third supply voltage VDD3 that could work normally.
Synchronous rectification switch converter according to this embodiment, during starting, high voltage startup module 411 is defeated according to direct current
Enter voltage VIN and generates the first supply voltage VDD1, the internal supply voltage VDD of the control module 420 for main switch M1.In
After control module 420 works normally, stable DC output voltage VOUT is obtained.During normal operation, direct current output electricity
It presses VOUT to be provided to capacitor C1 via diode D1, smooth DC voltage is generated after capacitor C1 filtering, as power supply module
410 the first external power supply voltage VCC1, power supply module 410 further generate the second power supply electricity according to DC output voltage VOUT
Press VDD2, the internal supply voltage of the control module 420 for main switch M1.At the same time, the further root of power supply module 410
Third supply voltage VDD3 is generated according to DC output voltage VOUT, the inside of the control module 420 for rectifier switch pipe M2 supplies
Piezoelectric voltage.
Since DC output voltage VOUT is less than DC input voitage, control electricity can be reduced during normal operation
The power consumption on road itself, to provide system effectiveness.
Fig. 6 shows the schematic circuit of the Voltage stabilizing module in synchronous rectification switch converter shown in Fig. 5.
Voltage stabilizing module 412 is, for example, low pressure difference linear voltage regulator (LDO), including operational amplifier AMP, transistor M21, electricity
Hinder R21 and R22.The non-inverting input terminal of operational amplifier AMP receives reference voltage VBG, and reversed-phase output receives third power supply electricity
The feedback signal of VDD3 is pressed, output end is connected to the control terminal of transistor M21.Transistor M21, resistance R21 and R22 are connected in series
Between the input terminal and ground of the second external power supply voltage VCC2.Third is provided in the intermediate node of transistor M21 and resistance R21
Supply voltage VDD3 provides the feedback signal of third supply voltage VDD3 in the intermediate node of resistance R21 and R22.The pressure stabilizing mould
Block 412 maintains third supply voltage VDD3 for pressure stabilizing output using feedback control loop.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or equipment institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including institute
State in the process, method, article or equipment of element that there is also other identical elements.
It is as described above according to the embodiments of the present invention, these embodiments details all there is no detailed descriptionthe,
Also not limiting the utility model is only the specific embodiment.Obviously, as described above, many modification and change can be made
Change.These embodiments are chosen and specifically described to this specification, is in order to preferably explain the principles of the present invention and actually to answer
With so that skilled artisan be enable to utilize the utility model and repairing on the basis of the utility model well
Change use.The utility model is limited only by the claims and their full scope and equivalents.
Claims (14)
1. a kind of synchronous rectification switch converter characterized by comprising
Main circuit, including main switch and rectifier switch pipe, the main switch and the rectifier switch pipe conducting complimentary to one another
And disconnection, for DC input voitage to be converted into DC output voltage；And
Control circuit is connected with the main circuit, for providing first switch control respectively to main switch and rectifier switch pipe
Signal and second switch processed control signal,
Wherein, the control circuit generates the first internal supply voltage using the DC input voitage during starting, is opening
First internal supply voltage is generated using the first external power supply voltage after dynamic, the first external power supply voltage is less than institute
State DC input voitage.
2. synchronous rectification switch converter according to claim 1, which is characterized in that the control circuit includes:
Power supply module receives the DC input voitage and the first external power supply voltage, generates the first supply voltage respectively
With the second supply voltage, and will one of first supply voltage and second supply voltage as it is described first inside supply
Piezoelectric voltage；And
First control module and the second control module, are connected with the power supply module respectively, are supplied with obtaining first inside
Piezoelectric voltage, and the first switch control signal and second switch control signal are generated respectively.
3. synchronous rectification switch converter according to claim 2, which is characterized in that the power supply module includes for connecing
Receive the first input end of the DC input voitage, the second input terminal for receiving the first external power supply voltage and
The output end of first internal supply voltage, the power supply module are provided further include:
Selector, for selecting one of first supply voltage and second supply voltage；
First Voltage stabilizing module is connected between the first input end and the selector；And
Second Voltage stabilizing module is connected between second input terminal and the selector.
4. synchronous rectification switch converter according to claim 3, which is characterized in that meet in second supply voltage
When circuit element demand inside the control circuit, the selector disables first Voltage stabilizing module.
5. synchronous rectification switch converter according to claim 3, which is characterized in that the power supply module further include:
Under-voltage detection module is connected between second input terminal and first Voltage stabilizing module,
Wherein, when the first external power supply voltage is less than predetermined reference value, the under-voltage detection module reactivates described
First Voltage stabilizing module.
6. synchronous rectification switch converter according to claim 3, which is characterized in that second input terminal is connected to institute
The output end of main circuit is stated, to receive the DC output voltage, the power supply module is using the DC output voltage as institute
State the first external power supply voltage.
7. synchronous rectification switch converter according to claim 6, which is characterized in that further include that be connected to described second defeated
Enter the first capacitor between end and ground.
8. synchronous rectification switch converter according to claim 1, which is characterized in that the control circuit includes:
Power supply module receives the DC input voitage, the first external power supply voltage and the second external power supply voltage, uses
The DC input voitage generates the first supply voltage, generates the second supply voltage using the first external power supply voltage, will
One of first supply voltage and second supply voltage are used as first internal supply voltage, and using described the
Two external power supply voltages generate the second internal supply voltage；And
First control module and the second control module, are connected with the power supply module respectively, are supplied with obtaining first inside
Piezoelectric voltage and second internal supply voltage, and the first switch control signal and the second switch control are generated respectively
Signal processed.
9. synchronous rectification switch converter according to claim 8, which is characterized in that the power supply module includes for connecing
It receives the first input end of the DC input voitage, the second input terminal for receiving the first external power supply voltage, be used for
The third input terminal for receiving the second external power supply voltage, mentions the first output end for providing first internal supply voltage
It second output terminal for second internal supply voltage and is connected in the main switch and the rectifier switch pipe
The floating ground terminal of intermediate node, the power supply module further include:
High voltage startup module is connected between the first input end and the floating ground terminal, for generating the first power supply electricity
Pressure；
Selector is connected to second input terminal and the floating ground terminal, using described in the first external power supply voltage conduct
Second supply voltage selects one of first supply voltage and second supply voltage as the first in-line power electricity
Pressure, and first internal supply voltage is provided in first output end；And
Voltage stabilizing module is connected between the third input terminal and the second output terminal, using the second external power supply electricity
Pressure generates second internal supply voltage.
10. synchronous rectification switch converter according to claim 9, which is characterized in that second input terminal and described
Third input terminal is connected to the output end of the main circuit, and to receive the DC output voltage, the power supply module will be described
DC output voltage is as the first external power supply voltage and the second external power supply voltage.
11. synchronous rectification switch converter according to claim 10, which is characterized in that further include:
Diode, the anode of the diode are connected to the output end of the main circuit, and cathode is connected to second input terminal；
And
First capacitor is connected between second input terminal and the floating ground.
12. synchronous rectification switch converter according to claim 10, which is characterized in that further include:
Second capacitor is connected between the third input terminal and ground.
13. synchronous rectification switch converter according to claim 1, which is characterized in that the main switch and described whole
Stream switching tube is connected in series between the input terminal and ground of the main circuit, the main circuit further include:
Inductance, be connected to the main switch and the rectifier switch pipe intermediate node and the main circuit output end it
Between；And
Output capacitance is connected between the output end and ground of the main circuit.
14. synchronous rectification switch converter according to claim 1, which is characterized in that the main switch and described whole
Stream switching tube is respectively any for being selected from metal oxide semiconductor field effect tube, insulated gate bipolar transistor and bipolar transistor
Kind.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821947952.4U CN209659177U (en) | 2018-11-23 | 2018-11-23 | Synchronous rectification switch converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821947952.4U CN209659177U (en) | 2018-11-23 | 2018-11-23 | Synchronous rectification switch converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209659177U true CN209659177U (en) | 2019-11-19 |
Family
ID=68507966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821947952.4U Withdrawn - After Issue CN209659177U (en) | 2018-11-23 | 2018-11-23 | Synchronous rectification switch converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209659177U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109450278A (en) * | 2018-11-23 | 2019-03-08 | 杭州士兰微电子股份有限公司 | Synchronous rectification switch converter and its control method |
| CN111478605A (en) * | 2020-04-15 | 2020-07-31 | 深圳市稳先微电子有限公司 | Synchronous rectification control chip and AC-DC system |
| US11239753B2 (en) | 2019-08-29 | 2022-02-01 | Hangzhou Silan Microelectronics Co., Ltd. | Switching converter, and control method and control circuit thereof |
| CN115268542A (en) * | 2021-07-09 | 2022-11-01 | 台湾积体电路制造股份有限公司 | Input/output device, low dropout regulator circuit and operation method thereof |
| CN109450278B (en) * | 2018-11-23 | 2024-11-12 | 杭州士兰微电子股份有限公司 | Synchronous rectification switch converter and control method thereof |
-
2018
- 2018-11-23 CN CN201821947952.4U patent/CN209659177U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109450278A (en) * | 2018-11-23 | 2019-03-08 | 杭州士兰微电子股份有限公司 | Synchronous rectification switch converter and its control method |
| CN109450278B (en) * | 2018-11-23 | 2024-11-12 | 杭州士兰微电子股份有限公司 | Synchronous rectification switch converter and control method thereof |
| US11239753B2 (en) | 2019-08-29 | 2022-02-01 | Hangzhou Silan Microelectronics Co., Ltd. | Switching converter, and control method and control circuit thereof |
| CN111478605A (en) * | 2020-04-15 | 2020-07-31 | 深圳市稳先微电子有限公司 | Synchronous rectification control chip and AC-DC system |
| CN111478605B (en) * | 2020-04-15 | 2021-07-06 | 深圳市稳先微电子有限公司 | Synchronous rectification control chip and AC-DC system |
| CN115268542A (en) * | 2021-07-09 | 2022-11-01 | 台湾积体电路制造股份有限公司 | Input/output device, low dropout regulator circuit and operation method thereof |
| CN115268542B (en) * | 2021-07-09 | 2024-01-30 | 台湾积体电路制造股份有限公司 | Input/output device, low dropout regulator circuit, and method of operating the same |
| US11966241B2 (en) | 2021-07-09 | 2024-04-23 | Taiwan Semiconductor Manufacturing Company, Ltd. | Low dropout regulator circuits, input/output device, and methods for operating a low dropout regulator |
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| AV01 | Patent right actively abandoned |
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