CN110350784A - Dc-dc controller and its operation method - Google Patents
Dc-dc controller and its operation method Download PDFInfo
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- CN110350784A CN110350784A CN201810480107.9A CN201810480107A CN110350784A CN 110350784 A CN110350784 A CN 110350784A CN 201810480107 A CN201810480107 A CN 201810480107A CN 110350784 A CN110350784 A CN 110350784A
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Classifications
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/083—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the ignition at the zero crossing of the voltage or the current
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention provides a kind of dc-dc controller and its operation method, and the dc-dc controller couples output stage and including circuit for detecting, comparator, trigger circuit and time signal generating circuit.Output stage includes switch on the bridge and bridge switch and provides inductive current and output voltage.Circuit for detecting couples output stage and provides control signal according to detecting value and threshold value.Detecting value is related with inductive current.Comparator provides comparison signal according to error signal and ramp signal.Error signal is related with output voltage.Time signal generation circuit couples output stage and trigger circuit and generation time signal.When detecting value is less than threshold value, bridge switch is closed, and trigger circuit provides delayed control signal according to control signal and comparison signal, switch on the bridge is connected to control time signal generation circuit generation time signal, switch on the bridge be connected can in zero voltage state, to effectively reduce the switch cost of switch on the bridge.
Description
Technical field
The present invention is related with power supply conversion, especially with respect to a kind of dc-dc controller and its operation method.
Background technique
Existing constant on-time (Constant On-Time, COT) DC-DC power converter when overloaded can
It operates under the continuous conduction mode with long turn-on time (TON) (Continuous Conduction Mode, CCM), and
Discontinuous conduction mode (the Discontinuous Conduction with short turn-on time can be then being operated at light load
Mode, DCM) under.If however above-mentioned operation mode is used in the application of high frequency (frequency be higher than 1MHz), in output stage
Switch on the bridge (High-side switch) be likely to because a large amount of caused by switch cost (Switching loss)
Thermal energy and burn, lead to reduced service life.Further, since its operating frequency is limited, also lead to the volume of related passive device
It can not further reduce, efficiency can not also be promoted again.
Summary of the invention
In consideration of it, the present invention proposes a kind of dc-dc controller and its operation method, effectively to solve prior art institute
The above problem suffered from.
A specific embodiment according to the present invention is a kind of dc-dc controller.In this embodiment, DC-DC
Controller couples output stage.Output stage includes switch on the bridge and bridge switch and provides inductive current and output voltage.Direct current-is straight
Stream controller includes circuit for detecting, comparator, trigger circuit and time signal generating circuit.Circuit for detecting couples output stage, and
Control signal is provided according to detecting value and threshold value, detecting value is related with inductive current.Comparator is believed according to error signal and oblique wave
Number comparison signal is provided, error signal is related with output voltage.Trigger circuit is respectively coupled to circuit for detecting and comparator.Time letter
Number generation circuit is respectively coupled to output stage and trigger circuit, and generation time signal is to control the operation of output stage.When detecting value
Bridge switch is closed when less than threshold value, and trigger circuit provides delayed control signal to the time according to control signal and comparison signal
Signal generating circuit, so that time signal generation circuit generation time signal is to be connected switch on the bridge.
In one embodiment, threshold value is dynamic threshold and related with inductive current.
In one embodiment, threshold value is the average value of inductive current.
In one embodiment, there is phase node, detecting value is the phase of phase node between switch on the bridge and bridge switch
Position voltage, and it is related with inductive current.
In one embodiment, trigger circuit includes delay cell and trigger unit.Delay cell couples circuit for detecting, to
Delayed control signal.Trigger unit coupled delay unit is mentioned according to comparison signal and the control signal after delayed cell delay
For trigger signal.
Another specific embodiment according to the present invention is a kind of dc-dc controller operation method.In this embodiment,
Dc-dc controller couples output stage.Output stage includes switch on the bridge and bridge switch and provides inductive current and output electricity
Pressure.Dc-dc controller operation method includes the following steps:
Control signal is provided according to detecting value and threshold value, detecting value is related with inductive current；
Comparison signal is provided according to error signal and ramp signal, error signal is related with output voltage；
When detecting value is less than threshold value, closes bridge switch and provide delay control letter according to control signal and comparison signal
Number；And
According to delayed control signal generation time signal switch on the bridge is connected.
In an embodiment, threshold value is dynamic threshold and related with inductive current.
In an embodiment, threshold value is the average value of inductive current.
In an embodiment, there is phase node between switch on the bridge and bridge switch, detecting value is the phase of phase node
Position voltage, and it is related with inductive current.
Compared to the prior art, according to the present invention dc-dc controller and its operation method makes upper in output stage
Bridge switch operates in zero voltage switching (Zero Voltage Switching, ZVS) state, since it can be according to the electricity sensed
Inducing current is generated with load condition and the threshold value for the zero voltage switching that dynamic adjusts, to provide more accurately switching time.In addition,
No matter load why, DC-DC power converter can maintain under discontinuous conduction mode, pass through to generate negative current
The body diode (Body diode) of switch on the bridge, so that switch on the bridge can be connected in zero voltage state, to effectively reduce
The switch cost of switch on the bridge.
It can be obtained further by detailed description of the invention below and appended attached drawing about the advantages and spirit of the present invention
Solution.
Detailed description of the invention
Fig. 1 shows the schematic diagram of the dc-dc controller in a specific embodiment according to the present invention.
Fig. 2 shows an embodiments of the driver in Fig. 1.
The different embodiments of the circuit for detecting in Fig. 1 are shown respectively from Fig. 3 B by Fig. 3 A.
Fig. 4 shows an embodiment of trigger circuit and time signal generation circuit in Fig. 1.
The timing diagram in heavy duty and each signal at light load is shown respectively in Fig. 5.
The present invention and the waveform of the single cycle of the dc-dc controller of known technology is shown respectively in Fig. 6 A and Fig. 6 B
Test measurement.
Fig. 7 shows the flow chart of the dc-dc controller operation method in another specific embodiment according to the present invention.
Main element symbol description:
2: dc-dc controller
20: circuit for detecting
22: comparator
24: trigger circuit
26: time signal generation circuit
DR: driver
OS: output stage
EA: error amplifier
RG: ramp generator
VIN: input voltage
VOUT: output voltage
IOUT: output electric current
VFB: feedback voltage
VREF: reference voltage
VCOMP: error signal
VRAMP: ramp signal
VCMP: comparison signal
VCDC: control signal
VTRD: delayed control signal
TON: time signal
UG, LG: switching signal
SA: switch on the bridge
SB: bridge switch
LX: phase node
L: inductance
DCR: D.C. resistance
IL: inductive current
VLX: phase voltage
RCO: output resistance
CO: output capacitance
RC: resistance
CC: capacitor
R1~R2: divider resistance
+: positive input terminal
: negative input end
K, J: output end
DR1: the first logic unit
DR2: the second logic unit
BUF: same to lock
AND: and lock
VIL: voltage signal
CMP: comparator
VDD: operating voltage
VX: reference voltage
CTV: electric current turns potential circuit
200: electric current turns potential circuit
R1: resistance
260: electric current turns potential circuit
262: comparator
M: switch
240: delay cell
242: trigger unit
HL: high levle
LL: low level
VCC: high levle
IL (MAX): inductive current maximum value
IL (MIN): inductive current minimum value
ILSET: predetermined current level
IOUT (MAX): output current maxima
IOUT (MIN): output current minimum
Δ IL, Δ IL ': the difference of inductive current maxima and minima
VDS: dram-source voltage
VGS: grid-source voltage
S10~S16: step
Specific embodiment
Now with detailed reference to exemplary embodiment of the invention, and illustrate the reality of the exemplary embodiment in the accompanying drawings
Example.In the drawings and embodiments the use of element/component of same or like label is for representing same or like part.
A specific embodiment according to the present invention is a kind of dc-dc controller.In this embodiment, DC-DC
Controller couples the output stage of DC-DC power converter, and zero electricity of dynamic adjustment is generated by the inductive current sensed
Switching threshold is pressed, to provide more accurately switching time, so that switch on the bridge can be connected in zero voltage state, therefore can be effective
Reduce its switch cost.
Fig. 1 is please referred to, Fig. 1 shows the schematic diagram of the dc-dc controller 1 in this embodiment.As shown in Figure 1, direct current-
DC controller 2 is respectively coupled to output stage OS, error amplifier EA and ramp generator RG.Output stage OS include driver DR,
Switch on the bridge SA, bridge switch SB, phase node LX, outputting inductance L and D.C. resistance DCR.Output stage OS provides inductive current
IL and output voltage VO UT.Switch on the bridge SA and bridge switch SB are serially connected between input voltage VIN and ground terminal.Phase node
LX is between switch on the bridge SA and bridge switch SB.Outputting inductance L is coupled between phase node LX and D.C. resistance DCR.
Driver DR is respectively coupled to switch on the bridge SA and bridge switch SB.
Dc-dc controller 2 includes circuit for detecting 20, comparator 22, trigger circuit 24 and time signal generating circuit
26.Circuit for detecting 20 is respectively coupled to output stage OS and trigger circuit 24；Comparator 22 is respectively coupled to trigger circuit 24, error amplification
Device EA and ramp generator RG；Trigger circuit 24 is respectively coupled to circuit for detecting 20, comparator 22 and time signal generation circuit 26；
Time signal generation circuit 26 couples output stage OS.
Circuit for detecting 20 is to detect output stage OS, to obtain detecting value from output stage OS.In practical applications,
This detecting value can be according to flowing through produced by the inductive current IL of outputting inductance L.For example, this detecting value can be inductive current
IL is also possible to the phase voltage VLX of phase node LX, also related with inductive current IL.
In addition, circuit for detecting 20 can also obtain threshold value.In practical applications, this threshold value is for dynamic threshold and also electric with inductance
It is related to flow IL.For example, this threshold value can be the average value of inductive current IL, and but not limited to this.
When circuit for detecting 20 obtains detecting value and threshold value respectively, circuit for detecting 20 can provide one according to detecting value and threshold value
Signal VCDC is controlled to trigger circuit 24.
Comparator 22 have first input end+, the second input terminal-and output end J.The first input end of comparator 22+with
Second input terminal-receives the error signal VCOMP from error amplifier EA respectively to be believed with the oblique wave from ramp generator RG
Number VRAMP, comparator 22 according to error signal VCOMP and ramp signal VRAMP generate comparison signal VCMP and by its output end J
Comparison signal VCMP is exported to trigger circuit 24.
Since the error amplifier EA error signal VCOMP for being supplied to comparator 22 is according to feedback voltage VFB and reference
Voltage VREF and generate and feedback voltage VFB is related with output voltage VO UT, such as feedback voltage VFB is output voltage VO UT's
Partial pressure, therefore, error signal VCOMP can be related with output voltage VO UT, and comparator 22 is according to error signal VCOMP and tiltedly
Comparison signal VCMP caused by wave signal VRAMP also can be related with output voltage VO UT.
Time signal generation circuit 26 receives input voltage VIN and output voltage VO UT respectively, and according to input voltage VIN
With driver DR of the output voltage VO UT generation time signal TON into output stage OS.In practical applications, time signal TON
Including a turn-on time (On-time), that is, turn-on time is related with input voltage VIN and output voltage VO UT.
When the driver DR in output stage OS receives time signal TON, driver DR is controlled according to time signal TON
The operation of switch on the bridge SA and bridge switch SB.Specifically, driver DR is according to the turn-on time difference in time signal TON
Switching signal UG and LG is generated to switch on the bridge SA and bridge switch SB, by opening to selectively turn on switch on the bridge SA or lower bridge
Close SB.
When detecting value is less than threshold value, control signal VCDC can close bridge switch SB, and trigger circuit 24 can foundation at this time
It controls signal VCDC and comparison signal VCMP and provides delayed control signal VTRD to time signal generation circuit 26, so that the time believes
Number generation circuit 26 generation time signal TON to driver DR, then it is supreme by driver DR difference output switching signal UG and LG
Bridge switch SA and bridge switch SB, by switch on the bridge SA is connected.
In one embodiment, as shown in Fig. 2, driver DR may include the first logic unit DR1 and the second logic unit
DR2.When the first logic unit DR1 receives turn-on time signal TON, the first logic unit DR1 meeting output switching signal UG,
To control the running of switch on the bridge SA；When the second logic unit DR2 receives turn-on time signal TON and controls signal VCDC's
When inversion signal, the second logic unit DR2 meeting output switching signal LG, to control the running of bridge switch SB.In practical application
In, the first logic unit DR1 may include two concatenated with one another with lock BUF and the second logic unit may include it is concatenated with one another and
Lock AND is with lock BUF, and but not limited to this.
The different embodiments of circuit for detecting 20 are shown respectively in A and Fig. 3 B, Fig. 3 A and Fig. 3 B referring to figure 3..
As shown in Fig. 3 A and Fig. 3 B, circuit for detecting 20 is produced according to the phase voltage VLX of inductive current IL and phase node LX
Raw control signal VCDC relevant to output voltage VO UT and inductive current IL.Its principle are as follows: turn potential circuit CTV using electric current
Inductive current IL is converted into the reference voltage VX of direct current, and reference voltage VX be inductive current IL average value and with load shape
State is related.
In the embodiment in fig. 3 a, circuit for detecting 20 is to generate voltage signal VIL according to phase voltage VLX, and pass through ratio
Control signal VCDC is generated according to voltage signal VIL and reference voltage VX compared with device CMP；In the embodiment of Fig. 3 B, circuit for detecting
20 are to turn potential circuit 200 using another electric current inductive current IL is converted into voltage signal VIL, and pass through comparator
CMP generates control signal VCDC according to voltage signal VIL and reference voltage VX.When voltage signal VIL is greater than reference voltage VX,
The control signal VCDC that circuit for detecting 20 is exported is low level (Low-level)；When voltage signal VIL is less than reference voltage VX
When, the control signal VCDC that circuit for detecting 20 is exported is high levle (High-level).
Referring to figure 4., Fig. 4 shows an embodiment of trigger circuit 24 Yu time signal generation circuit 26.
As shown in figure 4, trigger circuit 24 may include delay cell 240 and trigger unit 242.Delay cell 240 distinguishes coupling
Connect circuit for detecting 20 and trigger unit 242: trigger unit 242 is respectively coupled to delay cell 240 and time signal generation circuit 26.
When delay cell 240 receives the control signal VCDC from circuit for detecting 20, delay cell 240 can postpone one section it is default when
Between just by control signal VCDC be supplied to trigger unit 242.When trigger unit 242 is respectively received the comparison from comparator 22
Signal VCMP and delayed unit 240 postpone after control signal VCDC when, trigger unit 242 according to comparison signal VCMP with
It controls signal VCDC and provides delayed control signal VTRD to time signal generation circuit 26.When overloaded, comparison signal VCMP meeting
It is more intensive, cause the frequency integrally switched that can also increase accordingly.
Time signal generation circuit 26 may include that electric current turns potential circuit 260, comparator 262, switch M, resistance R and capacitor
C.When the delayed control signal VTRD provided by the trigger unit 242 is high levle (High-level), switch M can be switched on
Generation time signal TON.Specifically, electric current relevant to input voltage VIN can charge to capacitor C, when bearing for comparator 262
When input terminal-received voltage of institute is greater than its positive input terminal+institute received output voltage VO UT, comparator 262 exported when
Between signal TON will switch to low level (Low-level).Make comparator 262 when switch M is connected in delayed control signal VTRD
When negative input end-received voltage of institute is zero, the time signal TON that comparator 262 is exported will be returned to high levle
(High-level)。
Referring to figure 5., the left side of Fig. 5 shows the timing diagram of each signal when overloaded, and the right side of Fig. 5 is then shown gently
The timing diagram of each signal when load.
Compare known to left side and the right side of Fig. 5: when overloaded, switching frequency is very fast, the slope of inductive current IL compared with
Greatly, the level of predetermined current level ILSEL is lower；At light load, switching frequency is slower, and the slope of inductive current IL is smaller, in advance
If the level of current level ILSEL is higher.
Since in trigger circuit 24, control signal VCDC can be delayed by the delay a period of time of unit 240, so that control letter
Number VCDC and comparison signal VCMP can simultaneously be high levle (High-level) HL and provide delayed control signal VTRD to when
Between signal generating circuit 26.When the switch M in delayed control signal VTRD turn-on time signal generating circuit 26 makes comparator
262 negative input end-received voltage ground of institute and when being zeroed, time signal TON (time signal that comparator 262 is exported
TON is synchronized with switching signal UG) high levle VCC can be changed into.In addition, control signal VCDC can end switching signal LG, that is,
When control signal VCDC is changed into high levle HL by low level (Low-level) LL, switching signal LG can be turned by high levle VCC
Become 0, bridge switch SB is caused to close, is later 0 (that is, during bridge switch SB closing) in switching signal LG and switchs
In a period of signal UG is not yet changed into high levle VCC, switch on the bridge SA is flowed through using the negative current on phase node LX and is discharged,
Switching signal UG can just be changed into high levle VCC and switch on the bridge SA is connected again, by realize zero voltage switching (Zero
Voltage Switching, ZVS) function.
Since payload size will affect the frequency of comparison signal VCMP, then change operating frequency, and inductive current IL
Peak to peak (Peak-to-peak) current ripple (ripple) that is, inductive current maximum value IL (MAX) and inductive current minimum value
The difference DELTA IL of IL (MIN) is roughly equal by control, so the height of predetermined current level ILSEL can change with payload size
Become, such as in Fig. 5, predetermined current level ILSEL at light load can be higher than predetermined current level ILSEL when overloaded.
When inductive current IL is less than dynamic predetermined current level ILSEL, control signal VCDC can be turned by low level LL
Become high levle HL；At this point, switching signal LG meeting controlled signal VCDC cut-off, then carries out aforesaid operations and realizes no-voltage
The function of switching.
It should be noted that the time point that bridge switch LS is closed is determined according to control signal VCDC；Believe as the time
The time point of number TON conversion is determined according to control signal VCDC and comparison signal VCMP, hence it is evident that different from known technology
The time point of high levle HL is pulled to by low level LL only in accordance with comparison signal VCMP decision time signal TON.In short, of the invention
In zero voltage switching trigger time be determined by control signal VCDC, and using its generate negative current come reach zero electricity
The function that crush-cutting changes.
Fig. 6 A and Fig. 6 B are please referred to, the dc-dc controller of the present invention with known technology is shown respectively in Fig. 6 A and Fig. 6 B
Single cycle waveform testing measurement.Its test condition used are as follows: input voltage VIN=48V, output voltage VO UT
=5V, output current IO UT=10A, output capacitance CO=10uF, switching frequency FS=1.82MHz.Pass through the aobvious of single cycle
Show the clearly distinguishable electricity when the present invention and the dc-dc controller of known technology switch over device, on device out
Corrugating is significantly different.As shown in Figure 6A, when grid-source voltage VGS switches to high levle by low level, on device across
Press (dram-source voltage VDS) almost nil；As shown in Figure 6B, when the dc-dc controller of known technology carries out device
When switching, there are still cause switch cost that can not eliminate, so that the whole efficiency of system is bad to the cross-pressure on device.The present invention
Dc-dc controller can by the cross-pressure (dram-source voltage VDS) on device by input voltage VIN (this example be 48V)
It is brought down below the negative voltage of 0V, by the function to reach zero voltage switching.
Another specific embodiment according to the present invention is a kind of dc-dc controller operation method.In this embodiment,
Dc-dc controller operation method is to operate dc-dc controller.Dc-dc controller couples output stage.Output
Grade includes switch on the bridge and bridge switch and provides inductive current and output voltage.
Fig. 7 is please referred to, Fig. 7 shows the flow chart of the dc-dc controller operation method in this embodiment.Such as Fig. 7 institute
Show, dc-dc controller operation method may include the following steps:
Step S10: control signal is provided according to detecting value and threshold value, detecting value is related with inductive current；
Step S12: comparison signal is provided according to error signal and ramp signal, error signal is related with output voltage；
Step S14: it when detecting value is less than threshold value, closes bridge switch and prolongs according to control signal and comparison signal offer
Control signal late；And
Step S16: according to delayed control signal generation time signal switch on the bridge is connected.
In practical applications, threshold value is dynamic threshold and related with inductive current, such as threshold value can be inductive current
Average value, but not limited to this.
In one embodiment, detecting value is according to produced by inductive current, such as detecting value can be positioned at switch on the bridge
The phase voltage of phase node between bridge switch, and phase voltage is related with inductive current, but not limited to this.
Compared to the prior art, according to the present invention dc-dc controller and its operation method makes upper in output stage
Bridge switch operates in zero voltage switching state, dynamically adjusts since it can be generated according to the inductive current sensed with load condition
The threshold value of whole zero voltage switching, to provide more accurately switching time.In addition, no matter load why, DC-DC power turn
Parallel operation can maintain under discontinuous conduction mode, to generate body diode of the negative current by switch on the bridge, so that upper bridge
Switch can be connected in zero voltage state, to effectively reduce the switch cost of switch on the bridge.
Claims (9)
1. a kind of dc-dc controller, couple an output stage, above-mentioned output stage include a switch on the bridge and a bridge switch and
There is provided an inductive current and an output voltage, which is characterized in that above-mentioned dc-dc controller includes:
One circuit for detecting couples above-mentioned output stage, and provides a control signal according to a detecting value and a threshold value, wherein above-mentioned detect
Measured value is related with above-mentioned inductive current；
One comparator provides a comparison signal according to an error signal and a ramp signal, wherein above-mentioned error signal with it is above-mentioned
Output voltage is related；
One trigger circuit is respectively coupled to above-mentioned circuit for detecting and above-mentioned comparator；And
One time signal generating circuit is respectively coupled to above-mentioned output stage and above-mentioned trigger circuit, and generates a time signal to control
The operation of above-mentioned output stage is made,
Wherein when above-mentioned detecting value is less than above-mentioned threshold value, above-mentioned bridge switch is closed, and above-mentioned trigger circuit is according to above-mentioned control
Signal processed and above-mentioned comparison signal provide a delayed control signal to above-mentioned time signal generation circuit, so that above-mentioned time signal
Generation circuit generates above-mentioned time signal so that above-mentioned switch on the bridge is connected.
2. dc-dc controller according to claim 1, which is characterized in that above-mentioned threshold value be a dynamic threshold and with
Above-mentioned inductive current is related.
3. dc-dc controller according to claim 1, which is characterized in that above-mentioned threshold value is above-mentioned inductive current
Average value.
4. dc-dc controller according to claim 1, which is characterized in that above-mentioned switch on the bridge is opened with above-mentioned lower bridge
There is a phase node, above-mentioned detecting value is a phase voltage of above-mentioned phase node, and has with above-mentioned inductive current between pass
It closes.
5. dc-dc controller according to claim 1, which is characterized in that above-mentioned trigger circuit includes:
One delay cell couples above-mentioned circuit for detecting, to postpone above-mentioned control signal；And
One trigger unit couples above-mentioned delay cell, according to above-mentioned comparison signal with it is above-mentioned after above-mentioned delay units delay
It controls signal and one trigger signal is provided.
6. a kind of dc-dc controller operation method, above-mentioned dc-dc controller couples an output stage, above-mentioned output stage
Including a switch on the bridge and a bridge switch and provide an inductive current and an output voltage, which is characterized in that above-mentioned direct current-is straight
Stream controller operation method includes the following steps:
A control signal is provided according to a detecting value and a threshold value, wherein above-mentioned detecting value is related with above-mentioned inductive current；
A comparison signal is provided according to an error signal and a ramp signal, wherein above-mentioned error signal has with above-mentioned output voltage
It closes；
Above-mentioned bridge switch is closed when above-mentioned detecting value is less than above-mentioned threshold value, and is believed compared with above-mentioned according to above-mentioned control signal
Number provide a delayed control signal；And
A time signal is generated according to above-mentioned delayed control signal above-mentioned switch on the bridge is connected.
7. dc-dc controller operation method according to claim 6, which is characterized in that above-mentioned threshold value is a dynamic
Threshold value and related with above-mentioned inductive current.
8. dc-dc controller operation method according to claim 6, which is characterized in that above-mentioned threshold value is above-mentioned electricity
The average value of inducing current.
9. dc-dc controller operation method according to claim 6, which is characterized in that above-mentioned switch on the bridge with it is upper
State between bridge switch have a phase node, above-mentioned detecting value be above-mentioned phase node a phase voltage, and with above-mentioned electricity
Inducing current is related.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW107111682 | 2018-04-02 | ||
| TW107111682A TW201943190A (en) | 2018-04-02 | 2018-04-02 | DC-DC controller and operating method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN110350784A true CN110350784A (en) | 2019-10-18 |
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| CN201810480107.9A Pending CN110350784A (en) | 2018-04-02 | 2018-05-18 | Dc-dc controller and its operation method |
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| CN (1) | CN110350784A (en) |
| TW (1) | TW201943190A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113315394A (en) * | 2021-06-15 | 2021-08-27 | 矽力杰半导体技术(杭州)有限公司 | Control circuit and AC/DC power supply using same |
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2018
- 2018-04-02 TW TW107111682A patent/TW201943190A/en unknown
- 2018-05-18 CN CN201810480107.9A patent/CN110350784A/en active Pending
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| TW201943190A (en) | 2019-11-01 |
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