CN102339080B - Device and method for revising output voltage of primary side feedback flyback type power module - Google Patents
Device and method for revising output voltage of primary side feedback flyback type power module Download PDFInfo
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- CN102339080B CN102339080B CN201010230066.1A CN201010230066A CN102339080B CN 102339080 B CN102339080 B CN 102339080B CN 201010230066 A CN201010230066 A CN 201010230066A CN 102339080 B CN102339080 B CN 102339080B
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Abstract
The invention discloses a device and a method for revising an output voltage of a primary side feedback flyback type power module. The difference value between the value of the output voltage of the power module and a target value is captured, and a reference voltage used for regulating the output voltage is regulated according to the difference value, so the value of the output voltage is revised to the target value.
Description
Technical field
The present invention relates to and close a kind of primary side and feedback flyback power module, particularly a kind of primary side that corrects feedbacks the device and method of output voltage of flyback power module.
Background technology
Flyback power module uses transformer from primary side transmitted power to secondary side.Carry out regulation output voltage to obtain feedback signal from secondary side, secondary side needs voltage sensor, such as the combination of voltage stabilizer (shuntregulator) and photo-coupler.But these circuit can increase size and the cost of power module.
In order to reduce size and cost, also there is flyback power module to obtain output information from primary side and carrying out regulated output voltage, such as U.S. Patent number 5,438,499,6,480,399,6,721,192,6,781,357,6,833,692,6,862,194,6,967,472 and 6,977,824.But this primary side feedbacks flyback power module in default of secondary side information, so when error appears in the turn ratio of resistance, transformer, supply voltage or diode, output voltage there will be skew.To obtain output information accurately, then need transformer and secondary side assembly accurately, but this is a very large problem concerning cost and a large amount of production QC.
Summary of the invention
Object of the present invention, is to propose a kind of primary side that corrects and feedbacks the device and method of output voltage of flyback power module.
According to the present invention, correct primary side to feedback the device of output voltage of flyback power module and comprise the reference voltage that internal memory, digital analog converter, programmable unit and Circuit tuning be configured to adjust for regulating this output voltage, thus correcting this output voltage is desired value.
According to the present invention, a kind of primary side that corrects is feedback the method for output voltage of flyback power module and is comprised and the primary side earth terminal of this power module and secondary side earth terminal being linked together, there is provided input voltage to the power input of this power module, the output voltage detecting this power module produces detection signal, difference between the reference voltage capturing this detection signal and be used for regulating this output voltage, adjustment voltage is produced according to this difference, and according to this this reference voltage of adjustment Voltage Cortrol.
When power module is tested, can difference adjustment reference voltage between the above-mentioned device and method acquisition output voltage of mat and desired value, and then overcome because the output voltage skew that causes of the non-ideal factor of transformer and other assembly.
Accompanying drawing explanation
Fig. 1 is embodiments of the invention; And
Test circuit is connected the schematic diagram that power module carries out module testing by Fig. 2.
Embodiment
Fig. 1 is embodiments of the invention, feedback in flyback power module 10 at primary side, transformer T1 has first siding ring Lp and power switch M1 and is connected between power input VIN and primary side earth terminal GND, second siding ring Ls is connected between power output end Vout and secondary side earth terminal VSS, and primary side ancillary coil La responds to the voltage of second siding ring Ls, thus output voltage Vo is indirectly recorded, and produce induced voltage Va and produced feedback voltage VFB to control integration circuit 12 by resistance R1 and R2 dividing potential drop, control integration circuit 12 provides control signal Sc power switched switch M1 to become output voltage Vo to change input voltage Vi.In control integration circuit 12, error amplifier 34 difference of amplifying between reference voltage Vr2 and feedback voltage VFB produces the dutycycle of error signal Ve for controller 32 modulation power switch M1, and thus regulation output voltage Vo is in stable desired value.Energy-gap reference voltage generator (bandgap voltagereference generator) 22 provides reference voltage Vr1, and programmable unit 14, internal memory 24, digital analog converter 26 and Circuit tuning 28 are configured to adjustment reference voltage Vr1 becomes reference voltage Vr2.More specifically, programmable unit 14 produces data D according to the signal of the input end PI able to programme of reference voltage Vr1 and power module 10 and by its write memory 24.Internal memory 24 can be single programmable (One TimeProgrammable; OTP) internal memory or multiple programmable (Multiple Time Programmable; MTP) internal memory.Digital analog converter 26 reads the data D of internal memory 24 storage and is converted into adjustment voltage Vm.In this embodiment, Circuit tuning 28 comprises totalizer 30 and is added with reference voltage Vr1 by adjustment voltage Vm and produces reference voltage Vr2.Because reference voltage Vr2 system is used for regulation output voltage Vo, therefore change adjustment voltage Vm and recoverable output voltage Vo.In programmable unit 14, difference extractor 20 captures the difference DELTA V between the signal of reference voltage Vr1 and input end PI able to programme, and difference DELTA V is converted to data D by scrambler 18, and cd-rom recorder 16 is by data D write memory 24.
Test circuit 36 is connected the schematic diagram that power module 10 carries out module testing by Fig. 2, the primary side earth terminal GND of power module 10 and secondary side earth terminal VSS links together by test circuit 36, there is provided AC-input voltage Vi to power input VIN, and the output voltage Vo generation detection signal Vd utilizing resistance R3 and R4 to form voltage divider detecting power output end Vout send into input end PI able to programme.With reference to Fig. 1 and Fig. 2, because the predetermined target value of output voltage Vo and reference voltage Vr1 are known, therefore can suitably select resistance R3 and R4, make detection signal Vd when output voltage Vo equals predetermined target value, reference voltage Vr1 can be equaled.Ideally, Vm=0, Vr2=Vr1.If output voltage Vo is not equal to default desired value, then detection signal Vd is also not equal to reference voltage Vr1, therefore the difference DELTA V that programmable unit 14 produces will not be 0, the data D changed thus is written into internal memory 24, the adjustment voltage Vm that digital analog converter 26 will produce non-zero adjusts Vr1 for Circuit tuning 28 becomes Vr2=Vr1+Vm, to correct the desired value that output voltage Vo becomes default.
Known in the art, output voltage Vo has ripple (ripple).The desired value of output voltage Vo and the correction to output voltage Vo herein, all refers to direct current level (direct current (DC) level).
Claims (7)
1. correct primary side and feedback the device of output voltage of flyback power module, it is characterized in that, the output voltage of this power module is modulated according to the first reference voltage, and this device comprises:
Internal memory;
Digital analog converter, connects this internal memory, determines adjustment voltage according to the data of this memory storage;
Programmable unit, connects the input end able to programme of this internal memory, this power module, and the signal according to the second reference voltage and this input end able to programme produces this data, and these data are write this internal memory; And
Circuit tuning, connects this digital analog converter, according to this second reference voltage of this adjustment Voltage Cortrol to produce this first reference voltage.
2. device as claimed in claim 1, it is characterized in that, this programmable unit comprises:
Difference extractor, connects this input end able to programme, in order to capture the difference between the signal of this input end able to programme and this second reference voltage;
Scrambler, connects this difference extractor, this difference is converted to this data; And
Cd-rom recorder, connects this scrambler and internal memory, in order to these data are write this internal memory.
3. device as claimed in claim 1, is characterized in that, this is interior saves as single programmable internal memory.
4. device as claimed in claim 1, is characterized in that, this is interior saves as multiple programmable internal memory.
5. device as claimed in claim 1, it is characterized in that, this Circuit tuning comprises totalizer, and being added with this second reference voltage by this adjustment voltage becomes this first reference voltage.
6. one kind corrects primary side and feedbacks the method for output voltage of flyback power module, it is characterized in that, this power module comprises transformer and has first siding ring between the power input and primary side earth terminal of this power module, and second siding ring is between the power output end and secondary side earth terminal of this power module, this power output end provides the output voltage regulated according to the first reference voltage, and the method comprises the following steps:
(A) this primary side earth terminal and secondary side earth terminal are linked together;
(B) provide input voltage to this power input;
(C) detect this output voltage and produce detection signal;
(D) difference between this detection signal and the second reference voltage is captured;
(E) adjustment voltage is produced according to this difference; And
(F) according to this second reference voltage of this adjustment Voltage Cortrol to produce this first reference voltage.
7. method as claimed in claim 6, it is characterized in that, this step e comprises:
This difference of encoding produces data;
By this data write memory; And
Read from this internal memory and change these data and produce this adjustment voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010230066.1A CN102339080B (en) | 2010-07-19 | 2010-07-19 | Device and method for revising output voltage of primary side feedback flyback type power module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010230066.1A CN102339080B (en) | 2010-07-19 | 2010-07-19 | Device and method for revising output voltage of primary side feedback flyback type power module |
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| Publication Number | Publication Date |
|---|---|
| CN102339080A CN102339080A (en) | 2012-02-01 |
| CN102339080B true CN102339080B (en) | 2015-04-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201010230066.1A Expired - Fee Related CN102339080B (en) | 2010-07-19 | 2010-07-19 | Device and method for revising output voltage of primary side feedback flyback type power module |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI548194B (en) * | 2015-01-22 | 2016-09-01 | Richtek Technology Corp | A control circuit and a method for programming the output voltage of the power converter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6426628B1 (en) * | 1995-10-31 | 2002-07-30 | Cardiac Pacemakers, Inc. | Power management system for an implantable device |
| CN2886631Y (en) * | 2005-07-21 | 2007-04-04 | 崇贸科技股份有限公司 | A switching type controlling device for control power supplier on primary side |
| CN101009468A (en) * | 2006-01-23 | 2007-08-01 | 崇贸科技股份有限公司 | Power conversion device utilizing the front feedback voltage compensation and its method |
| CN101340155A (en) * | 2007-07-06 | 2009-01-07 | 立锜科技股份有限公司 | Apparatus and method for improving light load effect of flyback voltage converter |
-
2010
- 2010-07-19 CN CN201010230066.1A patent/CN102339080B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6426628B1 (en) * | 1995-10-31 | 2002-07-30 | Cardiac Pacemakers, Inc. | Power management system for an implantable device |
| CN2886631Y (en) * | 2005-07-21 | 2007-04-04 | 崇贸科技股份有限公司 | A switching type controlling device for control power supplier on primary side |
| CN101009468A (en) * | 2006-01-23 | 2007-08-01 | 崇贸科技股份有限公司 | Power conversion device utilizing the front feedback voltage compensation and its method |
| CN101340155A (en) * | 2007-07-06 | 2009-01-07 | 立锜科技股份有限公司 | Apparatus and method for improving light load effect of flyback voltage converter |
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| CN102339080A (en) | 2012-02-01 |
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