CN105991032B - Frequency controller of power converter and related frequency control method thereof - Google Patents
Frequency controller of power converter and related frequency control method thereof Download PDFInfo
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Abstract
本发明公开了一种电源转换器的频率控制器及相关频率控制方法。所述频率控制器包含一波谷信号产生单元、一波谷选择模块和一栅极信号产生单元。所述波谷信号产生单元根据一电压与一参考电压，产生对应所述电压的波谷信号；所述波谷选择模块根据一栅极控制信号、一补偿电压和所述波谷信号，产生一波谷选择信号；所述栅极信号产生单元根据所述波谷信号、所述波谷选择信号、所述补偿电压与一侦测电压，产生所述栅极控制信号。所述栅极控制信号的频率是随所述栅极控制信号的每一周期内所述电压的一对应波谷和一电源转换器的二次侧的负载改变，且介于一参考频率上限和一参考频率下限之间。因此，本发明可解决所述电源转换器轻载时产生噪音的问题。
The present invention discloses a frequency controller of a power converter and a related frequency control method. The frequency controller includes a valley signal generating unit, a valley selection module and a gate signal generating unit. The valley signal generating unit generates a valley signal corresponding to a voltage according to a voltage and a reference voltage; the valley selection module generates a valley selection signal according to a gate control signal, a compensation voltage and the valley signal; the gate signal generating unit generates the gate control signal according to the valley signal, the valley selection signal, the compensation voltage and a detection voltage. The frequency of the gate control signal changes with a corresponding valley of the voltage in each cycle of the gate control signal and a load on the secondary side of a power converter, and is between a reference frequency upper limit and a reference frequency lower limit. Therefore, the present invention can solve the problem of noise generated when the power converter is lightly loaded.
Description
Technical field
The present invention relates to a kind of frequency controller of power adapter and its relevant control method for frequency more particularly to one
Kind adjusts the frequency of grid control signal gradually between the reference frequency upper limit and reference frequency using trough selection signal
Frequency controller and its relevant control method for frequency between lower limit.
Background technique
When power adapter is at light load, frequency controller disclosed in the prior art is to be inserted into one section using Delay Element
Time (blanking time) is covered to reduce the frequency of the grid control signal of power adapter, that is to say, that reduces power supply
Converter is in switch cost at light load, wherein the masking time can change with the load of power adapter secondary side.It is above-mentioned to insert
Entering one masking time in the method for reducing the frequency of the grid control signal of power adapter is forced after covering the time,
The quasi-resonant mode (quasi resonant mode) of power adapter just executes trough switching.Therefore, power adapter is most
High switching frequency will be confined to the masking time, that is to say, that power adapter is that next trough after covering the time is held
The switching of traveling wave paddy.
But since the prior art is that next trough of the power adapter after covering the time is forced to execute trough switching, institute
With when covering the time terminates near a trough, power adapter may be to execute trough in different trough numbers in each period
Switching (such as power adapter is to execute trough switching in the first trough number in previous cycle, the period is in the second trough at present
Number executes trough switching etc.).In this way, because power adapter may be to execute trough in different trough numbers to cut in each period
It changes, it is possible to cause to generate a difference frequency between two continuous cycles.If the frequency of the difference frequency falls in human ear earshot
Interior, user will hear noise.Therefore, the prior art is not a good selection for a user.
Summary of the invention
One embodiment of the invention discloses a kind of frequency controller of power adapter.The frequency controller includes a wave
Paddy signal generation unit, a trough selecting module and a grid signal generate unit.The trough signal generation unit be to
According to a voltage and a reference voltage, the trough signal for corresponding to the voltage is generated；The trough selecting module is to root
According to a grid control signal, an offset voltage and the trough signal, a trough selection signal is generated；The grid signal generates
Unit is to according to the trough signal, the trough selection signal, the offset voltage and a detecting voltage, described in generation
Grid control signal, wherein the frequency of the grid control signal is the electricity in each period with the grid control signal
The corresponding trough of the one of pressure changes, and the corresponding trough is changed with the load of the secondary side of the power adapter.
Another embodiment of the present invention discloses a kind of control method for frequency of power adapter, wherein one is applied to the frequency
The frequency controller of rate control method includes that a trough signal generation unit, a trough selecting module and a grid signal generate list
Member, and the trough selecting module includes that a reference frequency upper limit/lower limit generates unit and a trough selector.The frequency control
Method processed includes the trough signal generation unit according to a voltage and a reference voltage, generates the trough for corresponding to the voltage
Signal；The trough selecting module generates trough choosing according to a grid control signal, an offset voltage and the trough signal
Select signal；The grid signal generates unit according to the trough signal, the trough selection signal, the offset voltage and one
Voltage is detected, the grid control signal is generated, wherein the frequency of the grid control signal is with the grid control signal
Each period in a corresponding trough of the voltage change, and the corresponding trough is the secondary side with the power adapter
Load change.
The present invention discloses a kind of frequency controller of power adapter and the control method for frequency of power adapter.The frequency
Rate controller and the control method for frequency are to generate a trough signal using a trough signal generation unit, are selected using a trough
It selects the reference frequency upper limit/lower limit in module and generates unit according to a grid control signal and an offset voltage, generate with described
The reference frequency upper limit and a reference frequency lower limit that offset voltage changes, are selected using the trough in the trough selecting module
Device generates one according to the reference frequency upper limit, the reference frequency lower limit, the trough signal and the grid control signal
Trough selection signal, and unit is generated according to the trough signal, the trough selection signal, described using a grid signal
Offset voltage and a detecting voltage, generate the grid control signal.Because the trough selector is according to described with reference to frequency
The rate upper limit, the reference frequency lower limit, the trough signal and the grid control signal, generate the trough selection signal,
So the frequency that the grid signal generates grid control signal caused by unit will be adjusted gradually between the reference
Between upper frequency limit and the reference frequency lower limit.Since the grid signal generates grid control signal caused by unit
Frequency will be adjusted gradually between the reference frequency upper limit and the reference frequency lower limit, so the present invention can solve
The prior art leads to the problem of noise in the power adapter at light load.
Detailed description of the invention
Fig. 1 is that first embodiment of the invention discloses a kind of schematic diagram applied in the frequency controller of power adapter.
Fig. 2 is that the load for the secondary side that explanation works as power adapter is turned at light load by heavy duty, offset voltage, voltage, grid
Control signal, current sense pin institute it is received detect voltage, trough signal and trough selection signal schematic diagram.
Fig. 3 is that the load for the secondary side that explanation works as power adapter is turned when overloaded by underloading, offset voltage, voltage, grid
Control the schematic diagram of signal, detecting voltage, trough signal and trough selection signal.
Fig. 4 is a kind of flow chart for the control method for frequency that second embodiment of the invention discloses power adapter.
Wherein, the reference numerals are as follows:
100 power adapters
102 bleeder circuits
104 power switch
106 resistance
200 frequency controllers
202 trough signal generation units
204 trough selecting modules
206 grid signals generate unit
208 auxiliary pins
210 compensation pins
212 grid pins
214 current sense pins
The 2042 reference frequency upper limits/lower limit generates unit
2044 trough selectors
20442 first comparators
20444 second comparators
20446 trough selection signals generate unit
204462 first counters
204464 second counters
204466 trough decoders
AUX auxiliary winding
A, the position B, C, D, E, F
The CLKH reference frequency upper limit
CLKL reference frequency lower limit
Number signal under DOWNS
The first trough of FV1, FV2
GCS grid control signal
IPRI electric current
PRI primary side
QRD trough signal
QRSEL trough selection signal
SEC secondary side
The second trough of SV1, SV2
TL, TM, TM1, TR, TR1 period
The T1-T8 time
The TON opening time
The TOFF shut-in time
TV1 third trough
Number signal on UPS
VD voltage
VREF reference voltage
VCOMP offset voltage
VOUT output voltage
400-418 step
Specific embodiment
Fig. 1 is please referred to, Fig. 1 is that first embodiment of the invention discloses a kind of frequency control applied in power adapter 100
The schematic diagram of device 200.As shown in Figure 1, frequency controller 200 includes a trough signal generation unit 202, a trough selecting module
204, a grid signal generates unit 206, an auxiliary pin 208, one compensation pin 210, a grid pin 212 and an electric current and detects
Survey pin 214.As shown in Figure 1, trough signal generation unit 202 be to according to the received voltage VD of the institute of auxiliary pin 208 with
One reference voltage VREF generates a trough signal QRD for corresponding to voltage VD, and wherein voltage VD relates to power adapter
The auxiliary winding AUX of 100 primary side PRI, and as produced by the bleeder circuit 102 for being coupled to auxiliary winding AUX.Such as Fig. 1 institute
To show, trough selecting module 204 generates unit 2042 and a trough selector 2044 comprising a reference frequency upper limit/lower limit, wherein
Trough selector 2044 is coupled to the upper limit/lower limit and generates unit 2042 and trough signal generation unit 202, and trough selector
2044 generate unit 20446 comprising a first comparator 20442, one second comparator 20444 and a trough selection signal.Separately
Outside, it includes one first counter 204462, one second counter 204464 and a trough that trough selection signal, which generates unit 20446,
Decoder 204466.
As shown in Figure 1, it is to generate unit 206 according to grid signal that the reference frequency upper limit/lower limit, which generates unit 2042,
The 210 received offset voltage VCOMP of institute of generated grid control signal GCS and compensation pin, generates a reference frequency upper limit
A CLKH and reference frequency lower limit CLKL, wherein offset voltage VCOMP relates to the secondary side SEC's of power adapter 100
Output voltage VO UT (that is offset voltage VCOMP is related with the load of the secondary side SEC of power adapter 100), and join
Examining upper frequency limit CLKH and reference frequency lower limit CLKL can change with offset voltage VCOMP.As shown in Figure 1, trough selector
2044, which are coupled to the reference frequency upper limit/lower limit, generates unit 2042 and trough signal generation unit 202.In trough selector 2044
First comparator 20442 be to generate number on one to the frequency according to reference frequency upper limit CLKH and grid control signal GCS
Signal UPS；The second comparator 20444 in trough selector 2044 is to according to reference frequency lower limit CLKL and grid control
The frequency of signal GCS generates and counts signal DOWNS.In addition, the trough selection signal in trough selector 2044 generates unit
20446 are coupled to first comparator 20442, the second comparator 20444 and trough signal generation unit 202, to according to upper number
The number of the number of signal UPS and trough signal QRD, lower several signal DOWNS and trough signal QRD or a current counting and wave
The number of paddy signal QRD generates a trough selection signal QRSEL, wherein the current counting is by the first counter 204462
Produced and trough signal QRD number is as produced by the second counter 204464.
Referring to figure 2., Fig. 2 is explanation when the load of the secondary side SEC of power adapter 100 is turned at light load, to mend by heavy duty
Repay voltage VCOMP, voltage VD, grid control signal GCS, the received detecting voltage DV of 214 institute of current sense pin, trough signal
The schematic diagram of QRD and trough selection signal QRSEL.As depicted in figs. 1 and 2, before time T1, the two of power adapter 100
The load of secondary side SEC is to maintain heavy duty.At this point, grid signal generation unit 206 can be in the cycle T L of grid control signal GCS
The one first trough FV1 of voltage VD enables grid control signal GCS according to trough signal QRD and trough selection signal QRSEL,
And in the cycle T L of grid control signal GCS, when detecting voltage DV more than or equal to offset voltage VCOMP, grid letter
Number generate unit 206 can according to offset voltage VCOMP and detecting voltage DV, close grid control signal GCS (A as shown in Figure 2
Position), wherein detecting voltage DV be by the power switch 104 that flows through the primary side PRI of power adapter 100 electric current IPRI and
One resistance 106 is determined, and grid control signal GCS is the primary side that power adapter 100 is sent to by grid pin 212
The power switch 104 of PRI.Because grid signal generate unit 206 can in the cycle T L of grid control signal GCS voltage VD
First trough FV1 enables grid control signal GCS according to trough signal QRD and trough selection signal QRSEL, and in grid
In the cycle T L for controlling signal GCS, according to offset voltage VCOMP and detecting voltage DV, grid control signal GCS is closed, so
Grid signal generate unit 206 can grid control signal GCS cycle T L in determine grid control signal GCS opening time
TON and shut-in time TOFF, that is to say, that grid signal generates unit 206 can be according to trough signal QRD, trough selection signal
QRSEL, offset voltage VCOMP and detecting voltage DV, generate grid control signal GCS.
As shown in Fig. 2, in time T1, the load reduction of the secondary side SEC of power adapter 100, so offset voltage
VCOMP is reduced with the load of the secondary side SEC of power adapter 100.Because the secondary side SEC's of power adapter 100
Load reduction, thus the opening time TON of the cycle T M of corresponding grid control signal GCS and shut-in time TOFF's and relatively corresponding
The opening time TON of the cycle T L of grid control signal GCS and shut-in time TOFF's and small, that is to say, that after time T1,
The frequency of grid control signal GCS increases and is more than reference frequency upper limit CLKH, causes first in trough selector 2044 to compare
Number signal UPS is generated compared with device 20442.Therefore, the first counter 204462 can be according to primary (this of number on upper several signal UPS
When be stored in the first counter 204462 number be " 2 ").After time t 2, due to being stored in the first counter 204462
Number is " 2 ", so trough decoder 204466 will generate trough choosing after the first trough FV2 (time T3) of voltage VD
Select signal QRSEL (B location as shown in Figure 2), that is to say, that after time T3, trough decoder 204466 can be according to the second meter
It counts the number " 1 " (corresponding first trough FV2) for the trough signal QRD that device 204464 is recorded and is stored in the first counter
204462 number " 2 " generates trough selection signal QRSEL after the first trough FV2 of voltage VD.Due to trough decoder
204466 can after the first trough FV2 of voltage VD generate trough selection signal QRSEL, so time T4 (voltage VD's
Second trough SV1) when, grid signal, which generates unit 206, to enable grid according to trough signal QRD and trough selection signal QRSEL
Pole controls signal GCS.Due to grid signal generate unit 206 can according to trough signal QRD and trough selection signal QRSEL,
The second trough SV1 (time T4) of voltage VD enables grid control signal GCS, so corresponding to the week of grid control signal GCS
Shut-in time TOFF of phase TM1 increases, that is to say, that after time t 2, the frequency of grid control signal GCS will be less than reference
Upper frequency limit CLKH.But if after time t 2, the frequency of grid control signal GCS is still greater than reference frequency upper limit CLKH,
Then frequency controller 200 repeats above-mentioned steps until the frequency of grid control signal GCS is lower than reference frequency upper limit CLKH.
Similarly, as shown in Fig. 2, in time T5, the load of the secondary side SEC of power adapter 100 reduces again, so
Offset voltage VCOMP also with the secondary side SEC of power adapter 100 load and reduce again.Because of power adapter 100
The load of secondary side SEC reduce again, so the opening time TON of the cycle T R of corresponding grid control signal GCS and closing
The opening time TON of time TOFF's and more corresponding grid control signal GCS's cycle T M1 and shut-in time TOFF's and small,
That is after time T5, the frequency of grid control signal GCS increases and is more than reference frequency upper limit CLKH, and trough is caused to select
It selects the first comparator 20442 in device 2044 and generates number signal UPS again.Therefore, the first counter 204462 can basis
Upper number is primary (number for being stored in the first counter 204462 at this time is " 3 ") again by upper several signal UPS.After time T6, due to
The number for being stored in the first counter 204462 is " 3 ", so trough decoder 204466 will be in the second trough of voltage VD
Trough selection signal QRSEL (location of C as shown in Figure 2) is generated after SV2 (time T7), that is to say, that after time t 7, wave
Paddy decoder 204466 can be according to number " 2 " (corresponding second trough for the trough signal QRD that the second counter 204464 is recorded
SV2) and it is stored in the number " 3 " of the first counter 204462, trough selection is generated after the second trough SV2 of voltage VD
Signal QRSEL.Since trough decoder 204466 can generate trough selection signal after the second trough SV2 of voltage VD
QRSEL, so grid signal generates unit 206 can be according to trough signal at time T8 (the third trough TV1 of voltage VD)
QRD and trough selection signal QRSEL enables grid control signal GCS.Since grid signal generation unit 206 can be according to trough
Signal QRD and trough selection signal QRSEL enables grid control signal GCS in the third trough TV1 (time T8) of voltage VD,
So shut-in time TOFF of the cycle T R1 corresponding to grid control signal GCS increases, that is to say, that after time T6, grid
The frequency of pole control signal GCS will be less than reference frequency upper limit CLKH.But if after time T6, grid control signal GCS
Frequency be still greater than reference frequency upper limit CLKH, then frequency controller 200 repeats above-mentioned steps until grid control signal GCS
Frequency be lower than reference frequency upper limit CLKH.
In addition, as shown in Fig. 2, grid control is believed when the load of the secondary side SEC of power adapter 100 remains unchanged
The frequency of number GCS can be between reference frequency upper limit CLKH and reference frequency lower limit CLKL.At this point, trough decoder 204466 is by root
According to the current number for counting the trough signal QRD recorded with the second counter 204464 of the first counter 204462, generate
Trough selection signal QRSEL.Such as after the time T4 in Fig. 2, if the load of the secondary side SEC of power adapter 100
It remains unchanged, then the frequency of grid control signal GCS will be between reference frequency upper limit CLKH and reference frequency lower limit CLKL.Cause
It will be between reference frequency upper limit CLKH and reference frequency lower limit CLKL, so trough is translated for the frequency of grid control signal GCS
Code device 204466 will be according to the current counting of the first counter 204462 (that is digital " 2 ") and the second counter 204464
The number of the trough signal QRD recorded generates trough selection signal QRSEL after the first trough of voltage VD.
Referring to figure 3., Fig. 3 is explanation when the load of the secondary side SEC of power adapter 100 is turned when overloaded, to mend by underloading
Repay voltage VCOMP, voltage VD, grid control signal GCS, detecting voltage DV, trough signal QRD and trough selection signal QRSEL
Schematic diagram.As shown in figures 1 and 3, before time T1, the load of the secondary side SEC of power adapter 100 is to remain light
It carries.At this point, grid signal generate unit 206 can in the cycle T L of grid control signal GCS voltage VD a third trough TV1
According to trough signal QRD and trough selection signal QRSEL, grid control signal GCS is enabled, and in grid control signal GCS
Cycle T L in, when detect voltage DV be greater than or equal to offset voltage VCOMP when, grid signal generate unit 206 can be according to benefit
Voltage VCOMP and detecting voltage DV are repaid, is closed grid control signal GCS (position D as shown in Figure 3).
As shown in figure 3, the load of the secondary side SEC of power adapter 100 increases, so offset voltage in time T1
VCOMP increases with the load of the secondary side SEC of power adapter 100.Because the secondary side SEC's of power adapter 100
Load increases, thus the opening time TON of the cycle T M of corresponding grid control signal GCS and shut-in time TOFF's and relatively corresponding
The opening time TON of the cycle T L of grid control signal GCS and shut-in time TOFF's and big, that is to say, that after time T1,
The frequency of grid control signal GCS reduces and is lower than reference frequency lower limit CLKL, causes second in trough selector 2044 to compare
Lower number signal DOWNS is generated compared with device 20444.Therefore, the first counter 204462 can be primary according to number under lower several signal DOWNS
(because it is to enable grid control signal in the third trough TV1 of voltage VD that grid signal, which generates unit 206, before time T1
GCS, so the number for being stored in the first counter 204462 at this time is to become " 2 " from " 3 ").After time t 2, due to being stored in
The number of first counter 204462 be " 2 ", so trough decoder 204466 will voltage VD the first trough FV1 (when
Between T3) after generate trough selection signal QRSEL (position E as shown in Figure 3), that is to say, that after time T3, trough decoding
Device 204466 can according to the number " 1 " of the trough signal QRD that the second counter 204464 is recorded (corresponding first trough FV1) with
And it is stored in the number " 2 " of the first counter 204462, generate trough selection signal QRSEL.Due to trough decoder 204466
Trough selection signal QRSEL can be generated after the first trough FV1 of voltage VD, so in time T4 (the second wave of voltage VD
Paddy SV1) when, grid signal, which generates unit 206, to enable grid control according to trough signal QRD and trough selection signal QRSEL
Signal GCS.Since grid signal generation unit 206 can be according to trough signal QRD and trough selection signal QRSEL, in voltage VD
The second trough SV1 (time T4) enable grid control signal GCS, so the cycle T M1 corresponding to grid control signal GCS
Shut-in time TOFF is reduced, that is to say, that after time t 2, the frequency of grid control signal GCS will be greater than reference frequency lower limit
CLKL.But if after time t 2, the frequency of grid control signal GCS is still less than reference frequency lower limit CLKL, then frequency control
Device 200 processed repeats above-mentioned steps until the frequency of grid control signal GCS is greater than reference frequency lower limit CLKL.
Similarly, as shown in figure 3, in time T5, the load of the secondary side SEC of power adapter 100 increases again, so
Offset voltage VCOMP also with the secondary side SEC of power adapter 100 load and increase.Because the two of power adapter 100
The load of secondary side SEC increases, so the opening time TON and shut-in time TOFF of the cycle T R of corresponding grid control signal GCS
And more corresponding grid control signal GCS cycle T M1 opening time TON and the shut-in time TOFF's and big, that is to say, that
After time T6, the frequency of grid control signal GCS reduces and is lower than reference frequency lower limit CLKL, leads to trough selector 2044
The second interior comparator 20444 generates lower number signal DOWNS.Therefore, the first counter 204462 can be according to lower several signals
Lower number is primary (number for being stored in the first counter 204462 at this time is " 1 ") again by DOWNS.After time t 7, due to being stored in
The number of first counter 204462 be " 1 ", so trough decoder 204466 will voltage VD the first trough FV2 (when
Between T8) before generate trough selection signal QRSEL (position F as shown in Figure 3), that is to say, that after time t 7, trough decoding
The number " 0 " for the trough signal QRD that device 204466 can be recorded according to the second counter 204464 and it is stored in the first counting
The number (1) of device 204462 generates trough selection signal QRSEL.Therefore, at time T8 (the first trough FV2 of voltage VD),
Grid signal, which generates unit 206, to enable grid control signal according to trough signal QRD and trough selection signal QRSEL
GCS.Due to grid signal generates unit 206 can be according to trough signal QRD and trough selection signal QRSEL, the of voltage VD
One trough FV2 (time T8) enables grid control signal GCS, so the closing of the cycle T R1 corresponding to grid control signal GCS
Time TOFF is reduced, that is to say, that after time T8, the frequency of grid control signal GCS will be greater than reference frequency lower limit
CLKL.But if the frequency of grid control signal GCS is still less than reference frequency lower limit CLKL, then frequency control after time T8
Device 200 processed repeats above-mentioned steps until the frequency of grid control signal GCS is greater than reference frequency lower limit CLKL.
In addition, as shown in figure 3, grid control is believed when the load of the secondary side SEC of power adapter 100 remains unchanged
The frequency of number GCS can be between reference frequency upper limit CLKH and reference frequency lower limit CLKL.At this point, trough decoder 204466 is by root
According to the current number for counting the trough signal QRD recorded with the second counter 204464 of the first counter 204462, generate
Trough selection signal QRSEL.Such as after the time T4 in Fig. 3, if the load of the secondary side SEC of power adapter 100
It remains unchanged, then the frequency of grid control signal GCS will be between reference frequency upper limit CLKH and reference frequency lower limit CLKL.Cause
It will be between reference frequency upper limit CLKH and reference frequency lower limit CLKL, so trough is translated for the frequency of grid control signal GCS
Code device 204466 will be according to the current counting of the first counter 204462 (that is digital " 2 ") and the second counter 204464
The number of the trough signal QRD recorded generates trough selection signal QRSEL after the first trough of voltage VD.
Fig. 1, Fig. 2, Fig. 3 and Fig. 4 are please referred to, Fig. 4 is the frequency that second embodiment of the invention discloses a kind of power adapter
The flow chart of control method.The control method for frequency of Fig. 4 is said using the power adapter 100 and frequency controller 200 of Fig. 1
Bright, detailed step is as follows:
Step 400: starting；
Step 402: trough signal generation unit 202 generates according to a voltage VD and a reference voltage VREF and corresponds to electricity
Press the trough signal QRD of VD；
Step 404: the reference frequency upper limit/lower limit generates unit 2042 according to the compensation electricity of a grid control signal GCS and one
VCOMP is pressed, an a reference frequency upper limit CLKH and reference frequency lower limit CLKL is generated；
Step 406: when the frequency of grid control signal GCS is greater than reference frequency upper limit CLKH, carrying out step 408；When
When the frequency of grid control signal GCS is less than reference frequency lower limit CLKL, step 412 is carried out；When the frequency of grid control signal GCS
When rate is between reference frequency upper limit CLKH and reference frequency lower limit CLKL, step 416 is carried out；
Step 408: first comparator 20442 is produced according to the frequency of reference frequency upper limit CLKH and grid control signal GCS
Number signal UPS on raw one；
Step 410: trough selection signal generates unit 20446 according to upper several signal UPS and trough signal QRD, generates one
Trough selection signal QRSEL carries out step 418；
Step 412: the second comparator 20444 is produced according to the frequency of reference frequency lower limit CLKL and grid control signal GCS
It is raw once to count signal DOWNS；
Step 414: trough selection signal generates unit 20446 according to lower several signal DOWNS and trough signal QRD, generates
One trough selection signal QRSEL carries out step 418；
Step 416: trough selection signal generates unit 20446 and counts at present and trough signal QRD, one wave of generation according to one
Paddy selection signal QRSEL carries out step 418；
Step 418: grid signal generates unit 206 according to trough signal QRD and trough selection signal QRSEL, in grid
The corresponding trough for controlling voltage VD in each period of signal GCS enables grid control signal GCS, and controls and believe in grid
According to offset voltage VCOMP and a detecting voltage DV in each period of number GCS, grid control signal GCS, rebound are closed
Step 402 and step 404.
In step 402, as shown in Figure 1, trough signal generation unit 202 is to be received according to auxiliary pin 208
Voltage VD and reference voltage VREF, generate correspond to voltage VD trough signal QRD, wherein voltage VD relate to power supply turn
The auxiliary winding AUX of the primary side PRI of parallel operation 100, and as produced by the bleeder circuit 102 for being coupled to auxiliary winding AUX.
In step 404, as shown in Figure 1, the reference frequency upper limit/lower limit generation unit 2042 can be generated according to grid signal
The 210 received offset voltage VCOMP of institute of grid control signal GCS caused by unit 206 and compensation pin, generates reference frequency
Upper limit CLKH and reference frequency lower limit CLKL, wherein offset voltage VCOMP relates to the secondary side SEC of power adapter 100
Output voltage VO UT (that is offset voltage VCOMP is related with the load of the secondary side SEC of power adapter 100), and
Reference frequency upper limit CLKH and reference frequency lower limit CLKL can change with offset voltage VCOMP.
In step 408 and step 410, as depicted in figs. 1 and 2, in time T1, the secondary side of power adapter 100
The load reduction of SEC, so offset voltage VCOMP is reduced with the load of the secondary side SEC of power adapter 100.Because
The load reduction of the secondary side SEC of power adapter 100, so the opening time of the cycle T M of corresponding grid control signal GCS
The opening time TON and shut-in time TOFF of TON and shut-in time TOFF's and more corresponding grid control signal GCS's cycle T L
And it is small, that is to say, that after time T1, the frequency of grid control signal GCS increases and is more than reference frequency upper limit CLKH, leads
The first comparator 20442 in trough selector 2044 is caused to generate number signal UPS.Therefore, the first counter 204462
It is primary (number for being stored in the first counter 204462 at this time is " 2 ") according to number on upper several signal UPS.After time t 2, by
In be stored in the first counter 204462 number be " 2 ", so trough decoder 204466 will be in the first wave of voltage VD
Trough selection signal QRSEL (B location as shown in Figure 2) is generated after paddy FV2 (time T3), that is to say, that after time T3,
Trough decoder 204466 can be according to number " 1 " (the corresponding first wave for the trough signal QRD that the second counter 204464 is recorded
Paddy FV2) and it is stored in the number " 2 " of the first counter 204462, trough choosing is generated after the first trough FV2 of voltage VD
Select signal QRSEL.In step 418, since trough decoder 204466 can generate wave after the first trough FV2 of voltage VD
Paddy selection signal QRSEL, so grid signal generates unit 206 can basis at time T4 (the second trough SV1 of voltage VD)
Trough signal QRD and trough selection signal QRSEL enables grid control signal GCS.Since grid signal generation unit 206 can
According to trough signal QRD and trough selection signal QRSEL, grid control is enabled in the second trough SV1 (time T4) of voltage VD
Signal GCS, so shut-in time TOFF of the cycle T M1 corresponding to grid control signal GCS increases, that is to say, that in time T2
Later, the frequency of grid control signal GCS will be less than reference frequency upper limit CLKH.But if after time t 2, grid controls
The frequency of signal GCS is still greater than reference frequency upper limit CLKH, then frequency controller 200 repeats above-mentioned steps until grid controls
The frequency of signal GCS is lower than reference frequency upper limit CLKH.In addition, in step 418, when detecting voltage DV is greater than or equal to compensation
When voltage VCOMP, grid signal, which generates unit 206, to close grid control letter according to offset voltage VCOMP and detecting voltage DV
Number GCS (such as location A shown in Fig. 2).
In step 412 and step 414, as shown in figures 1 and 3, in time T1, the secondary side of power adapter 100
The load of SEC increases, so offset voltage VCOMP increases with the load of the secondary side SEC of power adapter 100.Because
The load of the secondary side SEC of power adapter 100 increases, so the opening time of the cycle T M of corresponding grid control signal GCS
The opening time TON and shut-in time TOFF of TON and shut-in time TOFF's and more corresponding grid control signal GCS's cycle T L
And it is big, that is to say, that after time T1, the frequency of grid control signal GCS reduces and is lower than reference frequency lower limit CLKL, leads
The second comparator 20444 in trough selector 2044 is caused to generate lower number signal DOWNS.Therefore, the first counter 204462 is
It can primary according to number under lower several signal DOWNS (because before time T1, it be the of voltage VD that grid signal, which generates unit 206,
Three trough TV1 enable grid control signal GCS, so the number for being stored in the first counter 204462 at this time is become from " 3 "
"2").After time t 2, since the number for being stored in the first counter 204462 is " 2 ", so trough decoder 204466 will
Trough selection signal QRSEL (position E as shown in Figure 3) can be generated after the first trough FV1 (time T3) of voltage VD,
That is trough decoder 204466 can be according to the trough signal QRD's that the second counter 204464 is recorded after time T3
Number " 1 " (corresponding first trough FV1) and the number " 2 " for being stored in the first counter 204462, generate trough selection signal
QRSEL.In step 418, as shown in figure 3, since trough decoder 204466 can produce after the first trough FV1 of voltage VD
Raw trough selection signal QRSEL, so grid signal generates unit 206 can at time T4 (the second trough SV1 of voltage VD)
According to trough signal QRD and trough selection signal QRSEL, grid control signal GCS is enabled.Since grid signal generates unit
206 can enable grid in the second trough SV1 (time T4) of voltage VD according to trough signal QRD and trough selection signal QRSEL
Control signal GCS, so corresponding to grid control signal GCS cycle T M1 shut-in time TOFF reduce, that is to say, that when
Between after T2, the frequency of grid control signal GCS will be greater than reference frequency lower limit CLKL.But if after time t 2, grid
The frequency of signal GCS is controlled still less than reference frequency lower limit CLKL, then frequency controller 200 repeats above-mentioned steps until grid
The frequency for controlling signal GCS is greater than reference frequency lower limit CLKL.
In addition, in step 416, when the load of the secondary side SEC of power adapter 100 remains unchanged, grid control
The frequency of signal GCS can be between reference frequency upper limit CLKH and reference frequency lower limit CLKL.At this point, trough decoder 204466 will
According to the current number for counting the trough signal QRD recorded with the second counter 204464 of the first counter 204462, produce
Raw trough selection signal QRSEL.Such as after the time T4 in Fig. 2, if the secondary side SEC's of power adapter 100 is negative
Load remains unchanged, then the frequency of grid control signal GCS will be between reference frequency upper limit CLKH and reference frequency lower limit CLKL.
Because the frequency of grid control signal GCS will be between reference frequency upper limit CLKH and reference frequency lower limit CLKL, trough
Decoder 204466 will be according to the current counting of the first counter 204462 (that is digital " 2 ") and the second counter
The number of the 204464 trough signal QRD recorded generates trough selection signal QRSEL after the first trough of voltage VD.
Similarly, as shown in figure 3, when the load of the secondary side SEC of power adapter 100 remains unchanged, the frequency of grid control signal GCS
Rate can be between reference frequency upper limit CLKH and reference frequency lower limit CLKL.At this point, trough decoder 204466 will be according to the first meter
The current number for counting the trough signal QRD recorded with the second counter 204464 of number device 204462, generates trough selection
Signal QRSEL.Such as after the time T4 in Fig. 3, if the load of the secondary side SEC of power adapter 100 remains unchanged,
Then the frequency of grid control signal GCS will be between reference frequency upper limit CLKH and reference frequency lower limit CLKL.Because of grid control
The frequency of signal GCS processed will be between reference frequency upper limit CLKH and reference frequency lower limit CLKL, so trough decoder
204466 will be remembered according to the current counting of the first counter 204462 (that is digital " 2 ") with the second counter 204464
The number of the trough signal QRD of record generates trough selection signal QRSEL after the first trough of voltage VD.
In conclusion the frequency controller of power adapter disclosed in this invention and the frequency controlling party of power adapter
Method is to generate a trough signal using trough signal generation unit, generates unit according to a grid using the reference frequency upper limit/lower limit
Pole controls signal and an offset voltage, generates under the reference frequency upper limit and a reference frequency changed with the offset voltage
Limit, using trough selector according to the reference frequency upper limit, the reference frequency lower limit, the trough signal and the grid
Signal is controlled, generates a trough selection signal, and generate unit according to the trough signal, the trough using grid signal
Selection signal, the offset voltage and a detecting voltage, generate the grid control signal.Because trough selector is according to institute
The reference frequency upper limit, the reference frequency lower limit, the trough signal and the grid control signal are stated, the trough choosing is generated
Signal is selected, so the frequency that grid signal generates grid control signal caused by unit will be adjusted gradually between the ginseng
It examines between upper frequency limit and the reference frequency lower limit.Since grid signal generates the frequency of grid control signal caused by unit
Rate will be adjusted gradually between the reference frequency upper limit and the reference frequency lower limit, thus the present invention can solve it is existing
There is technology to lead to the problem of noise at light load in the power adapter.
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 (18)
1. a kind of frequency controller of power adapter, includes:
One trough signal generation unit, according to a voltage and a reference voltage, to generate the trough letter for corresponding to the voltage
Number；
It is characterized in that additionally comprising:
One trough selecting module, to generate a trough according to a grid control signal, an offset voltage and the trough signal
Selection signal, wherein the trough selecting module includes:
The one reference frequency upper limit/lower limit generates unit, to generate one according to the grid control signal and the offset voltage
The reference frequency upper limit and a reference frequency lower limit；And
One trough selector is coupled to the reference frequency upper limit/lower limit and generates unit and the trough signal generation unit, uses
To generate institute according to the reference frequency upper limit, the reference frequency lower limit, the trough signal and the grid control signal
State trough selection signal；And
One grid signal generates unit, to according to the trough signal, the trough selection signal, the offset voltage and one
Voltage is detected, the grid control signal is generated, wherein the frequency of the grid control signal is with the grid control signal
Each period in a corresponding trough of the voltage change, and the corresponding trough is the secondary side with the power adapter
Load change.
2. frequency controller as described in claim 1, it is characterised in that additionally comprise:
One auxiliary pin, to receive the voltage, wherein the voltage be the primary side of the power adapter auxiliary around
Voltage in group passes through produced by partial pressure.
3. frequency controller as described in claim 1, it is characterised in that additionally comprise:
One compensation pin, to receive the offset voltage, wherein the offset voltage relates to the power adapter
The output voltage of secondary side.
4. frequency controller as described in claim 1, it is characterised in that additionally comprise:
One grid pin, wherein the grid control signal is to be sent to the one of the power adapter by the grid pin
The power switch of secondary side.
5. frequency controller as described in claim 1, it is characterised in that the trough selector includes:
One first comparator, to when the frequency of the grid control signal be greater than the reference frequency upper limit when, according to described
The frequency of the reference frequency upper limit and the grid control signal generates number signal on one；
One second comparator, to when the frequency of the grid control signal be less than the reference frequency lower limit when, according to described
The frequency of reference frequency lower limit and the grid control signal generates and counts signal；And
One trough selection signal generates unit, is coupled to the first comparator, second comparator and the trough signal
Unit is generated, to according to upper several signals and the trough signal, lower several signals and the trough signal or a mesh
Preceding counting and the trough signal, generate the trough selection signal, wherein the current counting is by the trough selector
Produced by the first interior counter.
6. frequency controller as described in claim 1, it is characterised in that under the reference frequency upper limit and the reference frequency
Limit is changed with the offset voltage.
7. frequency controller as described in claim 1, it is characterised in that additionally comprise:
One current sense pin, to receive the detecting voltage, wherein the detecting voltage is by flowing through the power supply conversion
The electric current of the power switch of the primary side of device and a resistance are determined.
8. frequency controller as described in claim 1, it is characterised in that the two of the offset voltage and the power adapter
The load of secondary side is related.
9. frequency controller as described in claim 1, it is characterised in that it is according to the wave that the grid signal, which generates unit,
Paddy signal and the trough selection signal, the corresponding trough of the voltage enables the grid control within each period
Signal processed, and the grid control letter is closed according to the offset voltage and the detecting voltage within each period
Number.
10. a kind of control method for frequency of power adapter, wherein one is applied to the frequency controller of the control method for frequency
Unit, and the trough selecting module are generated comprising a trough signal generation unit, a trough selecting module and a grid signal
Unit and a trough selector are generated comprising a reference frequency upper limit/lower limit, the control method for frequency includes:
The trough signal generation unit generates the trough signal for corresponding to the voltage according to a voltage and a reference voltage；
It is characterized in that additionally comprising:
The reference frequency upper limit/lower limit generates unit according to a grid control signal and an offset voltage, generates one with reference to frequency
The rate upper limit and a reference frequency lower limit；
The trough selector is according to the reference frequency upper limit, the reference frequency lower limit, the trough signal and the grid
Pole controls signal, generates a trough selection signal；And
The grid signal generates unit and is detectd according to the trough signal, the trough selection signal, the offset voltage with one
Voltage is surveyed, the grid control signal is generated, wherein the frequency of the grid control signal is with the grid control signal
The corresponding trough of the one of the voltage changes in each period, and the corresponding trough is the secondary side with the power adapter
Load changes.
11. control method for frequency as claimed in claim 10, it is characterised in that the voltage is the one of the power adapter
Voltage in the auxiliary winding of secondary side passes through produced by partial pressure.
12. control method for frequency as claimed in claim 10, it is characterised in that the offset voltage relates to the power supply
The output voltage of the secondary side of converter.
13. control method for frequency as claimed in claim 10, it is characterised in that the trough selector is according to described with reference to frequency
The rate upper limit, the reference frequency lower limit, the trough signal and the grid control signal, generate the trough selection signal packet
Contain:
When the frequency of the grid control signal is greater than the reference frequency upper limit, according to the reference frequency upper limit and described
The frequency of grid control signal generates number signal on one；And
According to upper several signals and the trough signal, the trough selection signal is generated.
14. control method for frequency as claimed in claim 10, it is characterised in that the trough selector is according to described with reference to frequency
The rate upper limit, the reference frequency lower limit, the trough signal and the grid control signal, generate the trough selection signal packet
Contain:
When the frequency of the grid control signal is less than the reference frequency lower limit, according to the reference frequency lower limit and described
The frequency of grid control signal generates and counts signal；And
According to lower several signals and the trough signal, the trough selection signal is generated.
15. control method for frequency as claimed in claim 10, it is characterised in that the trough selector is according to described with reference to frequency
The rate upper limit, the reference frequency lower limit, the trough signal and the grid control signal, generate the trough selection signal packet
Contain:
When the frequency of the grid control signal is between the reference frequency upper limit and the reference frequency lower limit, according to a mesh
Preceding counting and the trough signal, generate the trough selection signal.
16. control method for frequency as claimed in claim 11, it is characterised in that the reference frequency upper limit and the reference frequency
Rate lower limit is changed with the offset voltage.
17. control method for frequency as claimed in claim 11, it is characterised in that the offset voltage and the power adapter
Secondary side load it is related.
18. control method for frequency as claimed in claim 11, it is characterised in that the grid signal generates unit according to
Trough signal, the trough selection signal, the offset voltage and the detecting voltage, generate the grid control signal packet
Contain:
The grid signal generation unit is according to the trough signal and the trough selection signal, the institute within each period
The corresponding trough for stating voltage enables the grid control signal；And
The grid signal generates unit within each period according to the offset voltage and the detecting voltage, closes institute
State grid control signal.
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| CN106788111B (en) * | 2016-11-28 | 2019-05-24 | 广东美芝制冷设备有限公司 | Electric machine control system and its compensation method of DC bus-bar voltage, device |
| CN109067213B (en) * | 2018-08-08 | 2019-12-20 | 苏州博创集成电路设计有限公司 | Switching power supply controller in quasi-resonance mode and control method |
| US11190022B2 (en) * | 2019-01-09 | 2021-11-30 | Texas Instruments Incorporated | Controller circuit for photovoltaic sub-module |
| TWI746259B (en) * | 2020-06-02 | 2021-11-11 | 立錡科技股份有限公司 | Flyback power converter circuit and conversion control circuit and control method thereof |
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| CN101552560A (en) * | 2009-01-13 | 2009-10-07 | 成都芯源系统有限公司 | Switch voltage stabilizing circuit and control method thereof |
| CN103312197A (en) * | 2012-03-07 | 2013-09-18 | 艾沃特有限公司 | Regulation for power supply mode transition to low-load operation |
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| KR101309293B1 (en) * | 2007-03-28 | 2013-09-16 | 페어차일드코리아반도체 주식회사 | Switching mode power supply and the driving method thereof |
| IT1396819B1 (en) * | 2009-11-26 | 2012-12-14 | St Microelectronics Srl | CURRENT DIGITAL CONTROL FOR THE ADJUSTMENT OF THE OUTPUT VOLTAGE OF SWITCHED FEEDERS |
| KR20140144874A (en) * | 2013-06-12 | 2014-12-22 | 삼성전자주식회사 | Resonant converter, power supply and power controlling method thereof |
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|---|---|---|---|---|
| CN101552560A (en) * | 2009-01-13 | 2009-10-07 | 成都芯源系统有限公司 | Switch voltage stabilizing circuit and control method thereof |
| CN103312197A (en) * | 2012-03-07 | 2013-09-18 | 艾沃特有限公司 | Regulation for power supply mode transition to low-load operation |
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