CN107800295A - A kind of type of voltage step-up/down converter and its method of work and terminal device - Google Patents
A kind of type of voltage step-up/down converter and its method of work and terminal device Download PDFInfo
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- CN107800295A CN107800295A CN201610808195.1A CN201610808195A CN107800295A CN 107800295 A CN107800295 A CN 107800295A CN 201610808195 A CN201610808195 A CN 201610808195A CN 107800295 A CN107800295 A CN 107800295A
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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
- H02M3/1582—Buck-boost converters
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- Dc-Dc Converters (AREA)
Abstract
The present invention discloses a kind of type of voltage step-up/down converter and its method of work and terminal device, and the type of voltage step-up/down converter includes inductance, first switch, second switch, third switch, electric capacity, charge pump, controller；Inductance connection is between voltage input end and switching node, first switch is connected between switching node and ground reference, second switch is connected between switching node and voltage output end, 3rd switch is connected between voltage input end and switching node, and capacitance connection is between voltage output end and ground reference；Charge pump provides power supply for controller, and controller is used to according to mode of operation, export for controlling the first control signal of first switch, the second control signal for controlling second switch, the 3rd control signal for controlling the 3rd switch.By the implementation of the present invention, the transformation to Boost circuit is realized, the output voltage that can be fixed from the input voltage of wide scope, so as to reduce chip area, saves chip cost.
Description
Technical field
The present invention relates to communication equipment field, more particularly to a kind of type of voltage step-up/down converter and its method of work and terminal to set
It is standby.
Background technology
Handheld device is powered using battery or USB more, the voltage range of power supply in 1.5V between 5.5V, and in general
Electronic product needs 5V, 3V or 1.8V voltage more, while needs larger output current, it is necessary to which the voltage for carrying out dc source turns
Change, realizing the technology of direct current power source voltage conversion has boosting (Boost), decompression (Buck) and buck (Buck-Boost).For
The stepping functions of dc source are realized, integrated Boost and Buck is difficult to receive in cost simultaneously in IC, and Buck-
Boost circuit control is complicated, and one of direction explored at present is to carry out transformation to Boost structures to make it be provided simultaneously with being depressured work(
Energy.
As shown in figure 1, working condition can be divided into liter by existing Boost according to the magnitude relationship of input and output voltage
Pressure and decompression.Boosting can be realized using traditional Boost controls, be mainly depressured using the weak conduction mode of P1 pipes during decompression.
Detailed process：When N1 is turned on, inductive current IL is risen with Vin/L；After N1 shut-offs, VLX is raised to more than VP1+Vth, Vth
For PMOS P1 threshold voltage, P1 manages weak conducting, and inductive current is declined with-Vth/L, the output voltage finally given.But
This circuit has the disadvantage that：Under decompression state, inductive current is declined with-Vth/L, and this slope is smaller, it is necessary to very long
Time could discharge the energy that inductance stores completely, and this stage is uncontrollable, it is easy to cause the overshoot of output voltage, negative
Overshooted when carrying by lightening again even more serious；Under decompression state, P1 pipes are in weak conducting state, and its conduction loss, which can be reduced seriously, to be turned
Change efficiency, even below traditional LDO (low dropout regulator, low pressure difference linear voltage regulator).
Therefore, how a kind of circuit for the output voltage that can be fixed from the input voltage of wide scope is provided, is this
Art personnel technical problem urgently to be resolved hurrily.
The content of the invention
, can be to provide one kind the invention provides a kind of type of voltage step-up/down converter and its method of work and terminal device
The circuit for the output voltage that the input voltage of wide scope is fixed.
In order to solve the above technical problems, the present invention uses following technical scheme:
A kind of type of voltage step-up/down converter, including：Inductance, first switch, second switch, third switch, electric capacity, charge pump, control
Device processed；Inductance connection between voltage input end and switching node, first switch be connected to switching node and ground reference it
Between, second switch is connected between switching node and voltage output end, and the 3rd switch is connected to voltage input end and switching node
Between, capacitance connection is between voltage output end and ground reference；Charge pump provides power supply for controller, and controller is used for root
According to mode of operation, export for control the first control signal of first switch, the second control signal for controlling second switch,
For controlling the 3rd control signal of the 3rd switch.
Further, first switch, second switch, third switch are NMOS tube, and the first control signal, the second control are believed
Number, the 3rd control signal be voltage signal, be respectively connecting to the grid to inductive switch, the source electrode connection reference ground electricity of first switch
Position, the drain electrode connection switching node of first switch；The source electrode connection voltage output end of second switch, the drain electrode connection of second switch
Switching node；The source electrode connection voltage input end of 3rd switch, the drain electrode connection switching node of the 3rd switch.
Further, in addition to controller the detection circuit being connected, detection circuit are used at work, detect extraneous supply
Piezoelectric voltage, and export to the controller, controller is used to determine mode of operation according to extraneous supply voltage.
Further, controller is used to determine mode of operation according to input voltage value, output voltage values, and mode of operation includes
First boost mode, the second boost mode, the 3rd decompression mode, the 4th decompression mode, the 5th decompression mode.
Further, if mode of operation is the first boost mode, controller is used to enable first switch and second switch, goes
Enabled 3rd switch；Inductance, first switch, second switch composition synchronous voltage booster circuit, if mode of operation is the second boost mode,
Controller is used to enable first switch, second switch and the 3rd switch, and controls inductance, first switch, second switch and the 3rd
The synchronous pseudo- continuous conduction mode booster circuit of switch composition.
Further, if mode of operation is the 3rd decompression mode, controller is used to control first switch closing, the 3rd switch
Conducting, voltage stabilizing circuit is formed with second switch.
Further, if mode of operation is the 4th decompression mode, controller is used to control the 3rd switch to be connected to switching node,
Form the back biased diode from voltage input end to switching node；During load reduction, controller control first switch pipe conducting pair
Induction charging, after inductive current reaches peak value, first switch is turned off, control second switch pipe charges to electric capacity, voltage input end
After reaching preset value, second switch is turned off, afterflow is carried out to inductive current by the 3rd switch.
Further, if mode of operation is the 5th decompression mode, during load reduction, controller control first switch conducting pair
Induction charging, after inductive current reaches peak value, first switch is turned off, control second switch pipe charges to electric capacity, and inductive current reaches
To after maximum, the 3rd switch conduction is controlled so that the electric current of inductance is not further added by, and after output voltage terminal reaches preset value, is closed
Disconnected second switch, afterflow is carried out to inductive current by the 3rd switch.
The present invention provides a kind of terminal device, and it includes type of voltage step-up/down converter provided by the invention.
The present invention provides a kind of method of work of type of voltage step-up/down converter, and type of voltage step-up/down converter includes inductance, first switch, the
Two switches, the 3rd switch, electric capacity, charge pump, controller；Between voltage input end and switching node, first opens inductance connection
Connection is connected between switching node and ground reference, and second switch is connected between switching node and voltage output end, and the 3rd
Switch is connected between voltage input end and switching node, and capacitance connection is between voltage output end and ground reference；Electric charge
Pump provides power supply for controller, controller be used to, according to mode of operation, exporting for control first switch the first control signal,
For controlling the second control signal of second switch, the 3rd control signal for controlling the 3rd switch；Type of voltage step-up/down converter
Method of work includes：
Controller receives mode of operation control instruction；
Controller is according to mode of operation control instruction, it is determined that current mode of operation；
Controller is according to current mode of operation, the first control signal of output, the second control signal and the 3rd control signal；
First switch works under the control of the first control signal；
Second switch works under the control of the second control signal；
3rd switch works under the control of the 3rd control signal.
Pass through the implementation of the present invention, there is provided a kind of type of voltage step-up/down converter for possessing multi-mode, can select as needed pair
The pattern answered, boosting or decompression are realized, has been achieved in that and Boost circuit is transformed, can boost and be depressured, can
With the output voltage being fixed from the input voltage of wide scope, so as to reduce chip area, chip cost, optimization load are saved
Transient response, according to using flexible configuration operation mode optimization performance.
Brief description of the drawings
Fig. 1 is a kind of schematic diagram of existing Boost circuit；
Fig. 2 is the circuit diagram of type of voltage step-up/down converter provided in an embodiment of the present invention；
Fig. 3 be the present embodiments relate to the first boost mode control sequential figure；
Fig. 4 be the present embodiments relate to the second boost mode control sequential figure；
Fig. 5 be the present embodiments relate to the 3rd decompression mode control sequential figure；
Fig. 6 be the present embodiments relate to the 4th decompression mode control sequential figure；
Fig. 7 be the present embodiments relate to the 5th decompression mode control sequential figure.
Embodiment
Main idea is that：Boost circuit is transformed, can boost and be depressured, can leniently model
The output voltage that the input voltage enclosed is fixed, so as to reduce chip area, chip cost is saved, optimization load transient is special
Property, according to using flexible configuration operation mode optimization performance；Terminal device in the present invention is mobile phone, notebook computer, palm
The terminal devices such as computer PAD, intelligent card chip.
Further annotation explanation is made to the present invention below by the mode of embodiment combination accompanying drawing.
Fig. 2 is the structural representation of type of voltage step-up/down converter provided in an embodiment of the present invention；As shown in Figure 2, in the embodiment
In, type of voltage step-up/down converter provided by the invention includes：Inductance L, first switch N1, second switch N2, the 3rd switch N3, electric capacity C,
Charge pump CP, controller；For inductance connection between voltage input end and switching node, first switch is connected to switching node and ginseng
Between examining ground potential, second switch is connected between switching node and voltage output end, and the 3rd switch is connected to voltage input end
Between switching node, capacitance connection is between voltage output end and ground reference；Charge pump provides power supply for controller, control
Device processed is used for according to mode of operation, export for controlling the first control signal of first switch, for control second switch the
Two control signals, the 3rd control signal for controlling the 3rd switch.
Preferably, first switch, second switch, third switch are NMOS tube, and the first control signal, the second control are believed
Number, the 3rd control signal be voltage signal, be respectively connecting to the grid to inductive switch.
Preferably, the source electrode connection ground reference of first switch, the drain electrode connection switching node of first switch；Second opens
The source electrode connection voltage output end of pass, the drain electrode connection switching node of second switch；The source electrode connection control source of 3rd switch
End, the drain electrode connection switching node of the 3rd switch.
Preferably, the type of voltage step-up/down converter shown in Fig. 2 also includes the detection circuit being connected with controller, and detection circuit is used for
At work, extraneous supply voltage is detected, and is exported to the controller, controller is used to determine work according to extraneous supply voltage
Operation mode.The present embodiment provides a kind of mechanism for automatically selecting mode of operation, in actual applications, due to the shakiness of external world's power supply
Qualitative, in type of voltage step-up/down converter, its boost mode or decompression mode can not be unalterable, and therefore, the present embodiment provides
Circuit is detected to detect extraneous supply voltage, it is more stable to come more good model, the output voltage of converter in real time.In practical application
In, detection circuit can include a resistance R and current mirror circuit, resistance R one end ground connection, another termination external voltage, root
Real-time current i is produced according to external voltage, current mirror circuit replicates real-time current i, and exports to controller, and controller is by real time
Electric current i is multiplied with resistance R resistance, obtains real-time external voltage u, the voltage U that real-time external voltage u is exported with needs
It is compared, determines that type of voltage step-up/down converter needs to be operated in boost mode or decompression mode, when real-time external voltage u is more than
The voltage U exported is needed, is operated in decompression mode, the voltage U that exports is needed when real-time external voltage u is less than, is operated in liter
Die pressing type.
Preferably, controller is used to determine mode of operation according to input voltage value, output voltage values, and mode of operation includes the
One boost mode, the second boost mode, the 3rd decompression mode, the 4th decompression mode, the 5th decompression mode.
Preferably, if mode of operation is the first boost mode, controller is used to enable first switch and second switch, goes to make
Can the 3rd switch；Inductance, first switch, second switch composition synchronous voltage booster circuit.
Preferably, if mode of operation is the second boost mode, controller is used to enable first switch, second switch and the 3rd
Switch, and control inductance, first switch, second switch and the synchronous pseudo- continuous conduction mode booster circuit of the 3rd switch composition.
Preferably, if mode of operation is the 3rd decompression mode, controller is used to control first switch closing, the 3rd switch to lead
It is logical, form voltage stabilizing circuit with second switch.
Preferably, if mode of operation is the 4th decompression mode, controller is used to control the 3rd switch to be connected to switching node, shape
Into the back biased diode from voltage input end to switching node；During load reduction, controller control first switch pipe conducting is to electricity
Sense charging, after inductive current reaches peak value, first switch is turned off, control second switch pipe charges to electric capacity, and voltage input end reaches
To after preset value, second switch is turned off, afterflow is carried out to inductive current by the 3rd switch.
Preferably, if mode of operation is the 5th decompression mode, during load reduction, controller control first switch conducting is to electricity
Sense charging, after inductive current reaches peak value, first switch is turned off, control second switch pipe charges to electric capacity, and inductive current reaches
After maximum, the 3rd switch conduction is controlled so that the electric current of inductance is not further added by, after output voltage terminal reaches preset value, shut-off
Second switch, afterflow is carried out to inductive current by the 3rd switch.
Present invention provides a kind of terminal device, and it includes type of voltage step-up/down converter provided by the invention.
It is corresponding, present invention provides a kind of method of work of type of voltage step-up/down converter, type of voltage step-up/down converter include inductance,
First switch, second switch, third switch, electric capacity, charge pump, controller；Inductance connection is in voltage input end and switching node
Between, first switch is connected between switching node and ground reference, and second switch is connected to switching node and voltage output
Between end, the 3rd switch is connected between voltage input end and switching node, and capacitance connection is in voltage output end and reference ground electricity
Between position；Charge pump provides power supply for controller, and controller is used for according to mode of operation, exports for controlling first switch
One control signal, the second control signal for controlling second switch, the 3rd control signal for controlling the 3rd switch；Lifting
The method of work of pressure converter includes：
Controller receives mode of operation control instruction；
Controller is according to mode of operation control instruction, it is determined that current mode of operation；
Controller is according to current mode of operation, the first control signal of output, the second control signal and the 3rd control signal；
First switch works under the control of the first control signal；
Second switch works under the control of the second control signal；
3rd switch works under the control of the 3rd control signal.
In conjunction with specific application example, the present invention is described in detail.
The present embodiment is transformed Boost circuit, can be boosted and is depressured, can be from the input voltage of wide scope
The output voltage being fixed, so as to reduce chip area, chip cost is saved, optimizes load transient characteristic, according to application spirit
Configuration work model-based optimization performance living.
Specifically, as shown in Fig. 2 the type of voltage step-up/down converter that the present embodiment provides is closed according to input voltage and output voltage
System, it is divided into boosting and decompression two states.
Pressure-increasning state：
Pattern 1：Inductance L, the typical synchronous Boost circuit of NMOS tube N1 and N2 composition, control sequential is referring to Fig. 3；
Pattern 2：Inductance L, NMOS tube N1, N2 and N3 form synchronous PCCM (pseudo-continuous conduction
Converter) Boost circuit, control sequential is referring to Fig. 4；
Both of which can complete boost function, the stable high-voltage signal of Charge pump outputs, driving VN1 and
VN2, reduce NMOS tube N1 and N2 conducting resistance.
Decompression state：
Pattern 3：NMOS tube N3 conductings are switched, with inductance in parallel, N1 pipes are closed, and controller and N2 form typical LDO knots
Structure, control sequential is referring to Fig. 5；
Pattern 4：NMOS tube N3 is connected to back biased diode of the VLX nodes formation from Vin to VLX, and NMOS tube N1, N2 is by controlling
Device is controlled, and during load reduction, N1 pipes are turned on to induction charging, and N1 is turned off after inductive current reaches peak value, and N2 pipes fill to electric capacity C
Electricity, now inductance both end voltage is Vin-Vout, and inductive current continues to increase, so the voltage current limliting by limiting N2 pipes,
N2 pipes turn off after Vout reaches preset value, carry out afterflow to inductive current by N3 pipes, control sequential is referring to Fig. 6.
Pattern 5：NMOS tube N1, N2 and N3 are controlled by controller, and during load reduction, N1 pipes are turned on to induction charging, inductance
N1 is turned off after electric current reaches peak value, and N2 pipes charge to electric capacity C, and now inductance both end voltage is Vin-Vout, and inductive current continues
Increase, N3 pipes are turned on after inductive current reaches maximum Imax so that inductance L electric current is not further added by, and Vout reaches preset value
N2 pipes turn off afterwards, carry out afterflow to inductive current by N3 pipes, control sequential is referring to Fig. 7.
These three patterns can complete buck functionality, and the stable high-voltage signal of Charge pump outputs, is NMOS tube
N1, N2 and N3 provide grid voltage, reduce conduction loss.
In actual applications, as shown in Fig. 2 the novel elevating pressure converter that the present embodiment provides is opened including inductance L, first
Close N1, second switch N2, the 3rd switch N3, electric capacity C, charge pump Charge pump, controller etc..It is defeated that inductance L is connected to voltage
Entering to hold between Vin and switching node VLX, first switch N1 is connected between switching node VLX and ground reference GND, and second
Switch N2 is connected between switching node VLX and voltage output end Vout, and the 3rd switch NMOS tube N3 is connected to voltage input end
Between Vin and switching node VLX, electric capacity C is connected between voltage output end Vout and ground reference GND, Charge Pump
Output high pressure Vcp provides power supply to control, controller output voltage VN1, VN2 and VN3 control respectively nmos pass transistor N1, N2 and
N3。
Pressure-increasning state configurable modes one and pattern two, control sequential is referring to Fig. 3 and 4；Decompression state configurable modes three,
Four and five, control sequential is referring to Fig. 5,6 and 7.
For pattern one and pattern two, it is realized simply, is repeated no more.
For pattern three：
First switch N1 control signals VN1 connects low, N1 disconnections, and the 3rd switch N3 connects height, and N3 is turned on, and output signal Vout is anti-
Controller is fed to, controller adjusts second switch N2 control signal VN2, the output stablized in real time according to Vout size
Vout.Pattern three is NMOS tube type LDO, has good transient response.
For pattern four：
3rd switch N3 control signals VN3 is connected to node VLX, forms the back biased diode by Vin to VLX, first switch
N1 and second switch N2 are controlled by controller output pulse signal, and controller is according to Vout output control signals.
As shown in fig. 6, when Vout is less than preset value, N1 opens inductive current and risen, after inductive current reaches preset value Ip
N2 is opened the shut-off of N1 pipes simultaneously, and the stage is Fig. 6 t1 sections；Inductance charges by N2 to electric capacity C, due to Vout<Vin inductance electricity
Stream continues to rise, the electric current of controller output VN2 voltage limitation N2 pipes, so final inductive current no longer increases after reaching Imax
Add, the stage is Fig. 6 t2 sections；N2 pipes are closed after output reaches preset value, now inductive current is continued by continued flow tube N3
Stream, finally give stable output Vout.Pattern four can be turned on when inductive current is relatively low by N2 pipes, accelerate electricity
Inducing current rises, so as to improve system's transient response characteristic.
For pattern five：
As shown in fig. 7, switch N1, N2 and N3 controls alternate conduction by control signal, when Vout is less than preset value, N1 is opened
Inductive current rising is opened, N2 is opened the shut-off of N1 pipes simultaneously after inductive current reaches preset value Ip, and the stage is Fig. 7 t1 sections；Electricity
Sense is charged by N2 to electric capacity C, due to Vout<Vin inductive currents continue to rise, and N3 pipes are opened after reaching preset value Imax, should
Stage is Fig. 7 t2 sections；Output voltage closes N2 pipes after reaching preset value, and the conducting of N3 pipes carries out afterflow to inductive current, finally
The output Vout stablized.Pattern five carries out afterflow by switching tube N3, can reduce loss, accelerates inductance electricity by N1 pipes
Stream rises, so as to improve system's transient response characteristic.
Advantages below at least be present compared with the Boost circuit shown in Fig. 1 in the type of voltage step-up/down converter that the present embodiment provides：
Transient response is good：During decompression pattern three using source class follow by the way of, output internal resistance it is smaller, response can carry
Rise the transient response of load；Pattern four and pattern five can be responded with acceleration system, optimize transient response.
High conversion efficiency：High voltage control power tube is produced using Charge pump, reduces the conducting resistance of power tube, can
To reduce loss, conversion efficiency is improved.
Flexible configuration：It is optional with multiple-working mode, according to different demand flexible configurations, realize optimal performance.
In actual applications, pattern four and pattern five can coordinate other control models, such as PWM (Pulse Width
Modulation, pulse width modulation), the controlling party such as PFM (Pulse Frequency Modulation, pulse frequency modulated)
Formula, optimize its operating efficiency.
By the implementation of the present invention, following beneficial effect can be obtained：
Pass through the implementation of the present invention, there is provided a kind of type of voltage step-up/down converter for possessing multi-mode, can select as needed pair
The pattern answered, boosting or decompression are realized, has been achieved in that and Boost circuit is transformed, can boost and be depressured, can
With the output voltage being fixed from the input voltage of wide scope, so as to reduce chip area, chip cost, optimization load are saved
Transient response, according to using flexible configuration operation mode optimization performance.
Further, transient response is good：During decompression pattern three using source class follow by the way of, output internal resistance it is smaller, ring
That answers can lift the transient response of load；Pattern four and pattern five can be responded with acceleration system, optimize transient response.Conversion effect
Rate is high：High voltage control power tube is produced using Charge pump, the conducting resistance of power tube is reduced, loss can be reduced, is improved
Conversion efficiency.Flexible configuration：It is optional with multiple-working mode, according to different demand flexible configurations, realize optimal performance.
Above content is to combine specific embodiment further description made for the present invention, it is impossible to assert this hair
Bright specific implementation is confined to these explanations.For general technical staff of the technical field of the invention, do not taking off
On the premise of from present inventive concept, some simple deduction or replace can also be made, should all be considered as belonging to the protection of the present invention
Scope.
Claims (10)
- A kind of 1. type of voltage step-up/down converter, it is characterised in that including：Inductance, first switch, second switch, third switch, electric capacity, Charge pump, controller；For the inductance connection between voltage input end and switching node, the first switch is connected to described cut Changing between node and ground reference, the second switch is connected between the switching node and voltage output end, and described Three switches are connected between voltage input end and the switching node, and the capacitance connection is in voltage output end and ground reference Between；The charge pump provides power supply for the controller, and the controller is used for according to mode of operation, exports for controlling the First control signal of one switch, the second control signal for controlling second switch, the 3rd control for controlling the 3rd switch Signal processed.
- 2. type of voltage step-up/down converter as claimed in claim 1, it is characterised in that the first switch, second switch, third switch It is NMOS tube, first control signal, the second control signal, the 3rd control signal are voltage signal, are respectively connecting to pair The grid of inductive switch, the source electrode of the first switch connects the ground reference, described in the drain electrode connection of the first switch Switching node；The source electrode of the second switch connects the voltage output end, and the drain electrode of the second switch connects the switching Node；The source electrode of 3rd switch connects the voltage input end, and the drain electrode of the 3rd switch connects the switching node.
- 3. type of voltage step-up/down converter as claimed in claim 1, it is characterised in that also include the detection electricity being connected with the controller Road, the detection circuit is used at work, detect extraneous supply voltage, and exports to the controller, the controller and use In determining mode of operation according to the extraneous supply voltage.
- 4. the type of voltage step-up/down converter as described in any one of claims 1 to 3, it is characterised in that the controller is used for according to defeated Enter magnitude of voltage, output voltage values determine mode of operation, the mode of operation includes the first boost mode, the second boost mode, the Three decompression modes, the 4th decompression mode, the 5th decompression mode.
- 5. type of voltage step-up/down converter as claimed in claim 4, it is characterised in that if the mode of operation is the first boost mode, The controller is used to enable first switch and second switch, removes enabled 3rd switch；The inductance, first switch, Two switch composition synchronous voltage booster circuits, if the mode of operation is the second boost mode, the controller is opened for enabling first Pass, second switch and the 3rd switch, and control the inductance, first switch, second switch and the synchronous puppet of the 3rd switch composition even Continuous conduction mode booster circuit.
- 6. type of voltage step-up/down converter as claimed in claim 4, it is characterised in that if the mode of operation is the 3rd decompression mode, The controller is used to control first switch closing, the 3rd switch conduction, and voltage stabilizing circuit is formed with the second switch.
- 7. type of voltage step-up/down converter as claimed in claim 4, it is characterised in that if the mode of operation is the 4th decompression mode, The controller is used to control the 3rd switch to be connected to the switching node, is formed anti-from voltage input end to switching node Inclined diode；During load reduction, controller control first switch pipe conducting reaches peak value to the induction charging, inductive current Afterwards, first switch is turned off, control second switch pipe charges to electric capacity, after voltage input end reaches preset value, turns off second switch, Afterflow is carried out to inductive current by the 3rd switch.
- 8. type of voltage step-up/down converter as claimed in claim 4, it is characterised in that if the mode of operation is the 5th decompression mode, During load reduction, the controller control first switch conducting is to induction charging, and after inductive current reaches peak value, shut-off first is opened Close, control second switch pipe charges to electric capacity, after inductive current reaches maximum, controls the 3rd switch conduction so that inductance Electric current is not further added by, and after output voltage terminal reaches preset value, turns off second switch, and inductive current is continued by the 3rd switch Stream.
- 9. a kind of terminal device, it is characterised in that including the type of voltage step-up/down converter as described in any one of claim 1 to 8.
- 10. a kind of method of work of type of voltage step-up/down converter, it is characterised in that the type of voltage step-up/down converter is opened including inductance, first Pass, second switch, the 3rd switch, electric capacity, charge pump, controller；The inductance connection voltage input end and switching node it Between, the first switch is connected between the switching node and ground reference, and the second switch is connected to the switching Between node and voltage output end, the 3rd switch is connected between voltage input end and the switching node, the electric capacity It is connected between voltage output end and ground reference；The charge pump provides power supply for the controller, and the controller is used According to mode of operation, export for controlling the first control signal of first switch, for controlling the second of second switch to control Signal, the 3rd control signal for controlling the 3rd switch；The method of work of the type of voltage step-up/down converter includes：The controller receives mode of operation control instruction；The controller is according to the mode of operation control instruction, it is determined that current mode of operation；The controller exports first control signal, the second control signal and the 3rd control according to current mode of operation Signal；The first switch works under the control of first control signal；The second switch works under the control of second control signal；3rd switch works under the control of the 3rd control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610808195.1A CN107800295A (en) | 2016-09-07 | 2016-09-07 | A kind of type of voltage step-up/down converter and its method of work and terminal device |
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| CN201610808195.1A CN107800295A (en) | 2016-09-07 | 2016-09-07 | A kind of type of voltage step-up/down converter and its method of work and terminal device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110391746A (en) * | 2018-04-23 | 2019-10-29 | 硅谷实验室公司 | PFM power-supply management system with automatic pattern switching |
| CN115065248A (en) * | 2022-08-18 | 2022-09-16 | 深圳市微源半导体股份有限公司 | Boost converter circuit and boost converter |
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| US20130200868A1 (en) * | 2012-02-03 | 2013-08-08 | Dialog Semiconductor Gmbh | Protection of an N-Channel Transistor |
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| CN101796708A (en) * | 2007-07-06 | 2010-08-04 | 先进模拟科技公司 | Supercharging and up-down switching regulator with synchronous freewheeling MOSFET |
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| CN115065248A (en) * | 2022-08-18 | 2022-09-16 | 深圳市微源半导体股份有限公司 | Boost converter circuit and boost converter |
| CN115065248B (en) * | 2022-08-18 | 2022-11-15 | 深圳市微源半导体股份有限公司 | Boost converter circuit and boost converter |
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Application publication date: 20180313 |