CN108880258A - The controller and its operating method of secondary side applied to power adapter - Google Patents
The controller and its operating method of secondary side applied to power adapter Download PDFInfo
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- CN108880258A CN108880258A CN201710334006.6A CN201710334006A CN108880258A CN 108880258 A CN108880258 A CN 108880258A CN 201710334006 A CN201710334006 A CN 201710334006A CN 108880258 A CN108880258 A CN 108880258A
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- controller
- sampling
- power adapter
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- tracking
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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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses the controllers and its operating method of a kind of secondary side applied to power adapter.The controller includes one sampling/tracking circuit and a comparator.The sampling/tracking circuit is coupled to the secondary side of the power adapter, when a sampled signal enables, to generate a sampling value of the output voltage of the corresponding power adapter, and the tracking value to generate the corresponding output voltage；The comparator coupling Jie is in the sampling/tracking circuit, according to the sampling value and the tracking value, to generate the primary side adjusting controller of a caution signal to the power adapter during a trace signals enable.The primary side adjusting controller adjusts the frequency of the grid control signal according to the caution signal, and the sampled signal and the trace signals will not enable simultaneously.Therefore, the present invention, which is applicable to the application of variable output voltage and avoidable ripple noise, makes the comparator generate the caution signal.
Description
Technical field
The present invention relates to a kind of controller of secondary side applied to power adapter and its operating methods more particularly to one
Kind can enable the primary side adjusting controller quickly controller in response to unexpected increased load and its operation of power adapter
Method.
Background technique
When the load of the secondary side of power adapter is the voltage-stabilizing controller of the primary side of the power adapter at light load
The frequency of generated grid control signal is lower, so the period of the grid control signal is longer at this time.Therefore, when described
When the load of the secondary side of power adapter is significantly increased suddenly, because the output power of the secondary side of the power adapter is only
It can be provided by the capacitor for being coupled to the secondary side of the power adapter, so the output electricity of the secondary side of the power adapter
Therefore pressure can rapidly decline, that is to say, that because the frequency of the grid control signal is lower, the voltage-stabilizing controller pair
It answers the response of the variation of the output voltage also relatively slow, causes the voltage-stabilizing controller can not be quickly in response to unexpected increased load
It and decline the output voltage can rapidly.Therefore, how designing one can be such that the voltage-stabilizing controller quickly increases in response to unexpected
The controller of the load added will become an important project.
Summary of the invention
One embodiment of the invention discloses a kind of controller of secondary side applied to power adapter.The controller packet
Containing one sampling/tracking circuit and a comparator.The sampling/tracking circuit is coupled to the secondary side of the power adapter, uses
To generate a sampling value of the output voltage of the corresponding power adapter, and to generate when a sampled signal enables
One tracking value of the corresponding output voltage；The comparator coupling Jie is in the sampling/tracking circuit, in a trace signals
During enabling, according to the sampling value and the tracking value, the primary side tune of a caution signal to the power adapter is generated
Save (primary-side regulation, PSR) controller.The primary side adjusting controller is adjusted according to the caution signal
The frequency of the whole grid control signal, and the sampled signal and the trace signals will not enable simultaneously.
Another embodiment of the present invention discloses a kind of operating method of the controller of secondary side applied to power adapter,
Wherein one sampling of controller/tracking circuit and a comparator.The operating method includes the sampling/tracking circuit in one
When sampled signal enables, a sampling value of the output voltage of the corresponding power adapter is generated；The sampling/tracking circuit produces
One tracking value of the raw corresponding output voltage；The comparator during a trace signals enable, according to the sampling value and
The tracking value generates the primary side adjusting controller of a caution signal to the power adapter, wherein the primary side tune
Controller is saved according to the caution signal, adjusts the frequency of the grid control signal, and the sampled signal and the tracking
Signal will not enable simultaneously.
The present invention discloses the controller and its operating method of a kind of secondary side applied to power adapter.The controller
And the operating method be generated using one sampling/tracking circuit the output voltage of the corresponding power adapter sampling value and
Tracking value, and generate a caution signal to the power supply according to the sampling value and the tracking value using a comparator and turn
The primary side adjusting controller of parallel operation.Then, the primary side adjusting controller can be according to the caution signal, described in increase
The frequency of the grid control signal of the power switch of the primary side of power adapter.Therefore, compared to the prior art, the present invention has
Have the advantages that following：The first, because the tracking value is the real-time output voltage of the corresponding power adapter, this hair
The bright application for being applicable to variable output voltage；The second, because the present invention is the decline percentage according to the output voltage,
Decide whether to generate the caution signal to the primary side adjusting controller, so the present invention can avoid in the output voltage
When higher, ripple noise makes the comparator generate the caution signal to the primary side adjusting controller.
Detailed description of the invention
Fig. 1 is a kind of controller of the secondary side applied to power adapter disclosed in the first embodiment of the present invention
Schematic diagram.
Fig. 2 is grid control signal, the power adapter for illustrating the power switch of primary side of corresponding power converter
The electric current of secondary side, sampled signal, trace signals, power adapter secondary side load variation, output voltage and warning
The time diagram of signal.
Fig. 3 A is a kind of controller of the secondary side applied to power adapter disclosed in the second embodiment of the present invention
Schematic diagram.
Fig. 3 B is a kind of controller of the secondary side applied to power adapter disclosed in another embodiment of the present invention
Schematic diagram.
Fig. 4 is a kind of controller of the secondary side applied to power adapter disclosed in the third embodiment of the present invention
The flow chart of operating method.
Wherein, the reference numerals are as follows：
100 power adapters
102 loads
104 power switch
106 primary side adjusting controllers
108 photo-couplers
200,200a, 200b controller
202,300 samplings/tracking circuit
204 comparators
206 driving circuits
2022 partial pressure units
2024 adjust unit
2026,302 current mirror
20222 first resistors
20224 second resistances
20242 operational amplifiers
20244 N-type metal oxide semiconductor transistors
20246 3rd resistors
20262 first P type metal oxide semiconductor transistors
20264 second P type metal oxide semiconductor transistors
20266 third P type metal oxide semiconductor transistors
20268 first switches
20270 second switches
20272 the 4th resistance
20274 first capacitors
3022 the 4th P type metal oxide semiconductor transistors
3024 the 5th P type metal oxide semiconductor transistors
3026 the 5th resistance
3028 thirds switch
3030 second capacitors
A node
DV partial pressure
GCS grid control signal
GND1, GND2 ground terminal
The first electric current of I1
The second electric current of I2
I3 third electric current
ISEC electric current
PRI primary side
SEC secondary side
SAS sampled signal
TS trace signals
The T1-T8 time
VCC, OPTOD pin
VOUT, VOUT1, VOUT2 output voltage
V1 first voltage
V2 second voltage
VSAM sampling value
VT tracking value
WS caution signal
400-406 step
Specific embodiment
Fig. 1 is please referred to, Fig. 1 is a kind of two applied to power adapter 100 disclosed in the first embodiment of the present invention
The schematic diagram of the controller 200 of secondary side SEC.As shown in Figure 1, controller 200 includes that one sampling/tracking circuit 202 and one compares
Device 204, wherein sample/track circuit 202 be coupled to the secondary side SEC and 204 coupling Jie of comparator of power adapter 100 in
Sampling/tracking circuit 202.
As shown in Figure 1, sampling/tracking circuit 202 includes that a partial pressure unit 2022, one adjusts unit 2024 and a current mirror
2026.Partial pressure unit 2022 includes a first resistor 20222 and a second resistance 20224, and wherein partial pressure unit 2022 is coupled to
The secondary side SEC of power adapter 100, the output of the secondary side SEC to receive power adapter 100 by a pin VCC
Voltage VOUT, and pass through formula (1) pressure-dividing output voltage VOUT using first resistor 20222 and second resistance 20224 to generate
One partial pressure DV：
Wherein R20222For the resistance value and R of first resistor 2022220224For the resistance value of second resistance 20224.In addition,
The coupling relationship of first resistor 20222 and second resistance 20224 can refer to Fig. 1, and details are not described herein.
Adjust unit 2024 include an operational amplifier 20242, a N-type metal oxide semiconductor transistor 20244 with
And a 3rd resistor 20246, wherein adjusting unit 2024 is coupled to divider 2022, to work as N-type metal-oxide semiconductor (MOS)
When 20244 normal operation of transistor, according to partial pressure DV, a first voltage V1 is generated, first voltage V1 and output voltage VO UT have
It closes, first voltage V1 is equal to partial pressure DV, and first voltage V1 and 3rd resistor 20246 can determine one first electric current by formula (2)
I1：
Wherein R20246For the resistance value of 3rd resistor 20246.In addition, operational amplifier 20242, N-type metal oxide half
The coupling relationship of conductor transistor 20244 and 3rd resistor 20246 can refer to Fig. 1, and details are not described herein.
In addition, as shown in Figure 1, current mirror 2026, which is coupled to, adjusts unit 2024 and comparator 204, comprising one first p-type
Metal oxide semiconductor transistor 20262, one second P type metal oxide semiconductor transistor 20264, a third p-type gold
Belong to oxide semi conductor transistor 20266, a first switch 20268, a second switch 20270, one the 4th resistance 20272 and
One first capacitor 20274, wherein the breadth length ratio of third P type metal oxide semiconductor transistor 20266 is equal to the first p-type metal
The breadth length ratio of the breadth length ratio of oxide semi conductor transistor 20262, the second P type metal oxide semiconductor transistor 20264 is
N times and N of the breadth length ratio of first P type metal oxide semiconductor transistor 20262 is a real number for being greater than 1.In addition, the
One P type metal oxide semiconductor transistor 20262, the second P type metal oxide semiconductor transistor 20264, third p-type gold
Belong to oxide semi conductor transistor 20266, first switch 20268, second switch 20270, the 4th resistance 20272 and the first electricity
The coupling relationship for holding 20274 can refer to Fig. 1, and details are not described herein.In addition, the present invention is not limited to the oxidation of third p-type metal
The breadth length ratio of object semiconductor transistor 20266 is equal to the breadth length ratio of the first P type metal oxide semiconductor transistor 20262,
That is in another embodiment of the invention, the breadth length ratio of third P type metal oxide semiconductor transistor 20266 is not equal to
The breadth length ratio of first P type metal oxide semiconductor transistor 20262.As shown in Figure 1, because the second p-type metal oxide half
The breadth length ratio of conductor transistor 20264 is N times of the breadth length ratio of the first P type metal oxide semiconductor transistor 20262, so
The the second electric current I2 for flowing through the second P type metal oxide semiconductor transistor 20264 is N times of the first electric current I1, and is flowed through
The third electric current I3 of third P type metal oxide semiconductor transistor 20266 is equal to the first electric current I1, wherein the second electric current I2 can
It is indicated by formula (3)：
Referring to figure 2., Fig. 2 is the grid control for illustrating the power switch 104 of primary side PRI of corresponding power converter 100
Signal GCS processed, the electric current ISEC of the secondary side SEC of power adapter 100, a sampled signal SAS, a trace signals TS, power supply
The variation of the load 102 of the secondary side SEC of converter 100, output voltage VO UT and a caution signal WS time diagram,
Middle sampled signal SAS and trace signals TS is generated by the signal generator (not being illustrated in Fig. 1) in controller 200, sampling letter
Number SAS and trace signals TS will not be enabled simultaneously, and sampled signal SAS and trace signals TS correspond to grid control signal GCS.Such as
Shown in Fig. 2, in a time T1, grid control signal GCS is closed, so the secondary side SEC of power adapter 100 starts to discharge
(there is electric current ISEC a maximum value and trace signals TS to be also switched off at this time).In a time T2, power adapter 100
Secondary side SEC discharge off and sampled signal SAS are enabled.As shown in Figure 1, in time T2, in sampling/tracking circuit 202
The second voltage V2 (corresponding time T2) of a node A can be indicated by formula (4), wherein R20272For the electricity of the 4th resistance 20272
(as shown in Fig. 2, because in time T2, power supply turns the output voltage VO UT that resistance value and VOUT1 are corresponding sample signal SAS
The secondary side SEC discharge off of parallel operation 100, so VOUT1 is the maximum value of output voltage VO UT)：
Because sampled signal SAS is enabled, second switch 20270 is opened, and the second voltage V2 of node A is caused to start pair
The charging of first capacitor 20274 is to generate the sampling value VSAM equal to second voltage V2 in the positive input terminal of comparator 204 (also
It is in time T2, first capacitor 20274 will store sampling value VSAM).
As shown in Figure 1, 2, in a time T3, because sampled signal SAS is closed and trace signals TS is enabled, the
The closing of two switches 20270 and first switch 20268 and comparator 204 are opened, and wherein trace signals TS can be enabled to the time
T4.Therefore, as shown in Figure 1, between time T3 and time T4, because trace signals TS is enabled, first switch 20268 is opened
Open, cause the tracking value VT between corresponding time T3 and time T4 generate comparator 204 negative input end and node A (
That is sampling/tracking circuit 202 is to generate tracking value VT during trace signals TS is enabled), wherein tracking value VT can pass through
Formula (5) indicates：
In addition, controller 200 can refer to controller 200 in the time in the operation of time T4, a time T5 and a time T6
The operation of T1, time T2 and time T3, details are not described herein.
Between time T3 and time T4, because trace signals TS is enabled, comparator 204 is opened.Therefore, in the time
Between T3 and time T4 (during namely trace signals TS is enabled), the sustainable relatively tracking value VT of comparator 204 is (by formula (5)
It is found that tracking value VT has the real time information of output voltage VO UT) and sampling value VSAM.
Before a time T7, because load 102 is underloading, the primary side of the primary side PRI of power adapter 100
The frequency for adjusting grid control signal GCS caused by (primary-side regulation, PSR) controller 106 is lower
(such as the frequency of grid control signal GCS can be lower than 1KHz).Therefore, if in time T7, load 102 increases suddenly, then
Because the frequency of grid control signal GCS is lower, the variation of the corresponding output voltage VO UT of primary side adjusting controller 106
Response is also relatively slow, causes output voltage VO UT that can rapidly decline.Therefore, in a time T8, tracking value VT can be equal to sampling value
VSAM, wherein the output voltage VO UT of the output voltage VO UT (namely VOUT1) of corresponding sample signal SAS and corresponding time T8
The relationship of (namely VOUT2) can be determined by formula (6)：
If N is 19, when VOUT2 is less than 0.95* (VOUT1) (namely after time T8), comparator 204 will
One drive circuit 206, a pin OPTOD and the photo-coupler 108 for generating caution signal WS and being additionally comprised by controller 200
To primary side adjusting controller 106, wherein primary side adjusting controller 106 can increase grid control letter according to caution signal WS
The frequency of number GCS and enabling time are quickly in response to increased load 102 suddenly.But in another embodiment of the invention, because
There is biggish driving capability for comparator 204, so caution signal WS caused by comparator 204 is directly to pass through pin
OPTOD and photo-coupler 108 are to primary side adjusting controller 106, that is to say, that when comparator 204 has biggish driving capability
When, driving circuit 206 can be omitted.
In addition, the present invention is not limited to the timing of sampled signal SAS and trace signals TS as shown in Figure 2, that is,
As long as saying that sampled signal SAS and trace signals TS will not be enabled simultaneously falls into the scope of the present invention.
In addition, the ground of the secondary side SEC of the ground terminal GND1 and power adapter 100 of the primary side PRI of power adapter 100
End GND2 can have same level or varying level.
A referring to figure 3., Fig. 3 A are a kind of applied to power adapter 100 disclosed in the second embodiment of the present invention
The schematic diagram of the controller 200a of secondary side SEC.As shown in Figure 3A, controller 200a and controller 200 the difference is that control
The current mirror 302 that sampling/tracking circuit 300 in device 200a is included is to continue according to first voltage V1, generates tracking value
(no matter that is whether trace signals TS enables, sampling/tracking circuit 300 all continues according to first voltage V1 VT, and generation chases after
Track value VT).As shown in Figure 3A, current mirror 302 includes one the 4th P type metal oxide semiconductor transistor 3022, one the 5th p-type
Metal oxide semiconductor transistor 3024, one the 4th resistance 20272, one the 5th resistance 3026, a third switch 3028 and
One second capacitor 3030, wherein the 4th P type metal oxide semiconductor transistor 3022, the 5th P type metal oxide semiconductor
The coupling relationship of transistor 3024, the 4th resistance 20272, the 5th resistance 3026, third switch 3028 and the second capacitor 3030
It can refer to Fig. 3 A, details are not described herein.In addition, the breadth length ratio of the 5th P type metal oxide semiconductor transistor 3024 is equal to the
The breadth length ratio of four P type metal oxide semiconductor transistors 3022.But the present invention is not limited to the 5th p-type metal oxide half
The breadth length ratio of conductor transistor 3024 is equal to the breadth length ratio of the 4th P type metal oxide semiconductor transistor 3022.
Referring to figure 2., 3A.As shown in Fig. 2, in time T2, the secondary side SEC discharge off of power adapter 100, with
And sampled signal SAS is enabled.As shown in Figure 3A, in time T2, the second voltage V2 of the node A in current mirror 302 is (corresponding
Time T2) can be indicated by formula (7), wherein VOUT1 be corresponding sample signal SAS output voltage VO UT (as shown in Fig. 2, because
For in time T2, the secondary side SEC discharge off of power adapter 100, so VOUT1 is the maximum of output voltage VO UT
Value)：
Because sampled signal SAS is enabled, the unlatching of third switch 3028 causes the second voltage V2 of node A to start pair
The charging of second capacitor 3030 is to generate the sampling value VSAM equal to second voltage V2 in the positive input terminal of comparator 204 (namely
In time T2, first capacitor 20274 will store sampling value VSAM).In addition, tracking value VT can be determined by formula (8), wherein
R3026For the resistance value of the 5th resistance 3026：
As shown in formula (8), work as R20272It is R3026N times when, formula (8) can be written over an accepted way of doing sth (9)：
In addition, sampling value VSAM can be determined by formula (10)：
Therefore, as shown in Fig. 2, if in time T7, load 102 increases suddenly, then because of grid control signal GCS's
Frequency is lower, so the response of the variation of the corresponding output voltage VO UT of primary side adjusting controller 106 is also relatively slow, leads to output electricity
Pressure VOUT can rapidly decline.Therefore, in time T8, tracking value VT can be equal to sampling value VSAM, wherein corresponding sample signal SAS
Output voltage VO UT (namely VOUT1) and the relationship of output voltage VO UT (namely VOUT2) of corresponding time T8 can be by
Formula (6) determines.Therefore, after time T8, comparator 204 will generate caution signal WS to primary side adjusting controller 106,
Middle primary side adjusting controller 106 can be according to caution signal WS, and the frequency of increase grid control signal GCS and enabling time are with fast
Speed is in response to increased load 102 suddenly.In addition, remaining operating principle of controller 200a is all identical with controller 200, herein not
It repeats again.
In addition, in another embodiment of the invention (as shown in Figure 3B), the secondary side applied to power adapter 100
The controller of the controller 200b of SEC and the secondary side SEC applied to power adapter 100 200a's the difference is that controller
200b does not include the 5th P type metal oxide semiconductor transistor 3024 and 3rd resistor 20246, that is to say, that and controller
200b and controller 200a's the difference is that controller 200b does not have current mirror function.Therefore, as shown in Fig. 2,3B, in the time
When T2, the second voltage V2 (corresponding time T2) of the node A in current mirror 302 can indicate that wherein VOUT1 is pair by formula (11)
Answer sampled signal SAS output voltage VO UT (as shown in Fig. 2, because in time T2, the secondary side SEC of power adapter 100
Discharge off, so VOUT1 is the maximum value of output voltage VO UT)：
In addition, tracking value VT can be determined by formula (12)：
In addition, the operating principle of controller 200b can refer to the operating principle and Fig. 2 of controller 200a, it is no longer superfluous herein
It states.
Please refer to Fig. 1,2,4, Fig. 4 be a kind of two applied to power adapter disclosed in the third embodiment of the present invention
The flow chart of the operating method of the controller of secondary side.The operating method of Fig. 4 is using Fig. 1,2 explanations, and detailed step is as follows：
Step 400：Start；
Step 402：Sampling/tracking circuit 202 generates the defeated of corresponding power converter 100 when sampled signal SAS is enabled
The sampling value VSAM of voltage VOUT out；
Step 404：Sampling/tracking circuit 202 generates the tracking value VT of corresponding output voltage VO UT；
Step 406：Comparator 204, according to sampling value VSAM and tracking value VT, generates police during trace signals TS is enabled
The primary side adjusting controller 106 of signal WS to power adapter 100 is accused, step 402 is jumped back to.
In step 402, the partial pressure unit 2022 in sampling/tracking circuit 202 can utilize first resistor 20222 and second
20224 pressure-dividing output voltage VOUT of resistance is to generate partial pressure DV；Adjusting unit 2024 in sampling/tracking circuit 202 can be in N-type
When 20244 normal operation of metal oxide semiconductor transistor, according to partial pressure DV, first voltage V1 is generated, wherein first voltage
V1 is related with output voltage VO UT, and first voltage V1, which is equal to partial pressure DV and first voltage V1 and 3rd resistor 20246, to be determined
First electric current I1.
As shown in Fig. 2, grid control signal GCS is closed, so the secondary side SEC of power adapter 100 in time T1
Start electric discharge (there is electric current ISEC a maximum value and trace signals TS to be also switched off at this time).In time T2, power adapter
100 secondary side SEC discharge off and sampled signal SAS enables.As shown in Figure 1, in time T2, because of sampled signal
SAS is enabled, so second switch 20270 is opened, causes the second voltage V2 of node A (by the 4th resistance 20272 and the second electric current
I2 is determined) start to charge to first capacitor 20274 to generate the sampling for being equal to second voltage V2 in the positive input terminal of comparator 204
Value VSAM (namely in time T2, first capacitor 20274 will store sampling value VSAM).
In step 404, as shown in Figure 1, 2, in time T3, because sampled signal SAS is closed and trace signals TS
It enables, so the closing of second switch 20270 and first switch 20268 and comparator 204 are opened, wherein trace signals TS meeting
It enables to time T4, and sampled signal SAS and trace signals TS will not be enabled simultaneously.Therefore, as shown in Figure 1, in time T3 and
Between time T4, because trace signals TS is enabled, first switch 20268 is opened, cause corresponding time T3 and time T4 it
Between tracking value VT generate comparator 204 negative input end and node A.In addition, as shown in Fig. 3 A, 3B, of the invention another
In one embodiment, the current mirror 302 that sampling/tracking circuit 300 in controller 200a is included is continued according to first voltage
V1 generates tracking value VT, that is to say, that sampling/tracking circuit 300 no matter whether trace signals TS enables, in controller 200a
All continue to generate tracking value VT according to first voltage V1.
In a step 406, between time T3 and time T4, because trace signals TS is enabled, comparator 204 is opened
It opens.Therefore, between time T3 and time T4 (during namely trace signals TS is enabled), comparator 204 can compare in real time to be chased after
Track value VT and sampling value VSAM.Before time T7, because load 102 is underloading, primary side adjusting controller 106 is produced
The frequency of raw grid control signal GCS is lower (such as the frequency of grid control signal GCS can be lower than 1KHz).Therefore, if
In time T7, load 102 increases suddenly, then because the frequency of grid control signal GCS is lower, corresponding output voltage
The response of the variation of VOUT is also relatively slow, causes output voltage VO UT that can rapidly decline.Therefore, in time T8, tracking value VT meeting
Equal to sampling value VSAM.After time T8, because tracking value VT is less than sampling value VSAM, comparator 204 will generate police
It accuses signal WS and transmits caution signal WS to primary side adjusting controller 106, wherein primary side adjusting controller 106 can be according to police
Signal WS is accused, increases frequency and the enabling time of grid control signal GCS quickly in response to increased load 102 suddenly.
In conclusion the controller and its operating method of the secondary side disclosed in this invention applied to power adapter are
The sampling value and tracking value of the output voltage of the corresponding power adapter, Yi Jili are generated using the sampling/tracking circuit
With the comparator according to the sampling value and the tracking value, generates the caution signal to the primary side and adjust control
Device.Then, the primary side adjusting controller can increase the frequency of the grid control signal according to the caution signal.
Therefore, compared to the prior art, the present invention has the following advantages that：The first, because the tracking value is that the corresponding power supply turns
The real-time output voltage of parallel operation, so the present invention is applicable to the application of variable output voltage；The second, because the present invention is
According to the decline percentage of the output voltage, decide whether to generate the caution signal to the primary side adjusting controller,
So the present invention can avoid when the output voltage is higher, ripple noise makes the comparator generate the caution signal to institute
State primary side adjusting controller.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (13)
1. a kind of controller of the secondary side applied to power adapter, it is characterised in that include：
One sampling/tracking circuit, is coupled to the secondary side of the power adapter, to generate when a sampled signal enables
One sampling value of the output voltage of the corresponding power adapter, and the tracking to generate the corresponding output voltage
Value；And
One comparator, coupling Jie is in the sampling/tracking circuit, to during a trace signals enable, according to the sampling value
With the tracking value, the primary side adjusting controller of a caution signal to the power adapter is generated；
Wherein the primary side adjusting controller adjusts the frequency of the grid control signal, and institute according to the caution signal
Stating sampled signal and the trace signals will not enable simultaneously.
2. controller as described in claim 1, it is characterised in that：When the tracking value is less than the sampling value, the ratio
The caution signal is generated to the primary side adjusting controller compared with device.
3. controller as described in claim 1, it is characterised in that：The primary side adjusting controller is according to the warning letter
Number, increase the frequency of the grid control signal.
4. controller as described in claim 1, it is characterised in that：The sampling/tracking circuit is enabled in the trace signals
Period generates the tracking value.
5. controller as described in claim 1, it is characterised in that：The sampled signal and the trace signals correspond to the electricity
The grid control signal of the power switch of the primary side of source converter.
6. controller as described in claim 1, it is characterised in that the sampling/tracking circuit includes：
One partial pressure unit is coupled to the secondary side of the power adapter, to generate a partial pressure according to the output voltage；
One adjusts unit, is coupled to the divider, a first voltage is generated, wherein described first according to the partial pressure
Voltage is related with the output voltage；And
One current mirror is coupled to the adjusting unit and the comparator, in the sampled signal enable when, according to described
First voltage, generates the sampling value, and during the trace signals enable, according to the first voltage, described in generation
Tracking value.
7. controller as described in claim 1, it is characterised in that the sampling/tracking circuit includes：
One partial pressure unit is coupled to the secondary side of the power adapter, to generate a partial pressure according to the output voltage；
One adjusts unit, is coupled to the divider, a first voltage is generated, wherein described first according to the partial pressure
Voltage is related with the output voltage；And
One current mirror is coupled to the adjusting unit and the comparator, in the sampled signal enable when, according to described
First voltage generates the sampling value, and to generate the tracking value according to the first voltage.
8. controller as described in claim 1, it is characterised in that additionally comprise：
One drive circuit, coupling Jie is between the comparator and the primary side adjusting controller of the power adapter, to pass
Send the caution signal to the primary side adjusting controller of the power adapter.
9. a kind of operating method of the controller of the secondary side applied to power adapter, wherein the controller one is sampled/chased after
Track circuit and a comparator, it is characterised in that include：
The sampling/tracking circuit generates the one of the output voltage of the corresponding power adapter when sampled signal enables
Sampling value；
The sampling/tracking circuit generates a tracking value of the corresponding output voltage；And
The comparator, according to the sampling value and the tracking value, generates a caution signal during a trace signals enable
To the primary side adjusting controller of the power adapter；
Wherein the primary side adjusting controller adjusts the frequency of the grid control signal, and institute according to the caution signal
Stating sampled signal and the trace signals will not enable simultaneously.
10. operating method as claimed in claim 9, it is characterised in that：It is described when the tracking value is less than the sampling value
Comparator generates the caution signal to the primary side adjusting controller.
11. operating method as claimed in claim 9, it is characterised in that：The primary side adjusting controller is according to the warning
Signal increases the frequency of the grid control signal.
12. operating method as claimed in claim 9, it is characterised in that：The sampling/tracking circuit is opened in the trace signals
With period, the tracking value is generated.
13. operating method as claimed in claim 9, it is characterised in that：The sampled signal and the trace signals correspond to institute
State the grid control signal of the power switch of the primary side of power adapter.
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| CN201710334006.6A CN108880258B (en) | 2017-05-12 | 2017-05-12 | Controller applied to secondary side of power converter and operation method thereof |
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| CN201710334006.6A CN108880258B (en) | 2017-05-12 | 2017-05-12 | Controller applied to secondary side of power converter and operation method thereof |
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| CN1407701A (en) * | 2001-08-17 | 2003-04-02 | Tdk株式会社 | Switch power supply device |
| US20130200865A1 (en) * | 2010-08-13 | 2013-08-08 | Nujira Limited | Switch mode power supply for envelope tracking |
| CN103532350A (en) * | 2012-08-06 | 2014-01-22 | 崇贸科技股份有限公司 | Control circuit with fast dynamic response for power converters |
| CN103683907A (en) * | 2012-09-12 | 2014-03-26 | 德克萨斯仪器股份有限公司 | Fixed frequency DC to DC converter control circuit with improved load transient response |
| CN104201897A (en) * | 2014-08-31 | 2014-12-10 | 广州金升阳科技有限公司 | Dynamic process detection method and fast response circuit of switching power supply |
| CN105656312A (en) * | 2014-11-27 | 2016-06-08 | 富士电机株式会社 | Switching power supply device |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1407701A (en) * | 2001-08-17 | 2003-04-02 | Tdk株式会社 | Switch power supply device |
| US20130200865A1 (en) * | 2010-08-13 | 2013-08-08 | Nujira Limited | Switch mode power supply for envelope tracking |
| CN103532350A (en) * | 2012-08-06 | 2014-01-22 | 崇贸科技股份有限公司 | Control circuit with fast dynamic response for power converters |
| CN103683907A (en) * | 2012-09-12 | 2014-03-26 | 德克萨斯仪器股份有限公司 | Fixed frequency DC to DC converter control circuit with improved load transient response |
| CN104201897A (en) * | 2014-08-31 | 2014-12-10 | 广州金升阳科技有限公司 | Dynamic process detection method and fast response circuit of switching power supply |
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| CN108880258B (en) | 2021-03-23 |
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