CN107342676B - A kind of method and system of control power bridge output - Google Patents
A kind of method and system of control power bridge output Download PDFInfo
- Publication number
- CN107342676B CN107342676B CN201710615602.1A CN201710615602A CN107342676B CN 107342676 B CN107342676 B CN 107342676B CN 201710615602 A CN201710615602 A CN 201710615602A CN 107342676 B CN107342676 B CN 107342676B
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- Prior art keywords
- reference voltage
- latch
- low
- high level
- comparator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0012—Control circuits using digital or numerical techniques
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
Abstract
The present invention relates to power bridge technical fields, disclose a kind of method of accurate power control bridge output.It specifically includes following procedure: generating the first reference voltage and the second reference voltage using digital analog converter；First reference voltage and the second reference voltage are compared with ramp voltage respectively, obtains and has dephased first PWM (modulation of pulse width modulation pulse width) and the 2nd PWM；First PWM and the 2nd PWM controls the output of power bridge by driver respectively.This method can generate PWM pairs of the phase difference of very little, and be not necessarily to very high basic frequency, and the phase difference precision generated is very high, and scalability is good；The small PWM of phase difference is to can be with the output of accurate power control bridge.The invention also discloses a kind of systems of accurate power control bridge output.
Description
Technical field
The present invention relates to power bridge technical field, especially a kind of method and system of accurate power control bridge output.
Background technique
Power can be driven in PWM (modulation of pulse width modulation pulse width) waveform external drive circuit
Bridge, but accurately to control the power of total power bridge (or half-power bridge), it is necessary to there are two PWM (PWM that phase difference is smaller
It is right).
Currently existing scheme is all the phase difference that PWM pairs is controlled using the counting of high frequency, is needed with very high basic frequency
The phase accuracy needed can be generated, basic frequency low in other words can only generate lower precision.As shown in Figure 1, what MCLK was indicated
It is the basic frequency for generating phase difference, PWM_A and PWM_B is made to generate 0.42 ° of phase difference T, basic frequency fMCLKIt is with reference to frequency
Rate fREF360/0.42=857 times.If necessary to fREF=200kHz, fMCLK=200kHz*857=171.4MHz, this is very
High basic frequency.
Summary of the invention
The technical problems to be solved by the present invention are: in view of the above problems, providing a kind of accurate power control
The method and system of bridge output.
The technical solution adopted by the invention is as follows: a kind of method of accurate power control bridge output, specifically includes following mistake
Journey:
Step 1 generates the first reference voltage and the second reference voltage using digital analog converter；
Step 2 compares the first reference voltage and the second reference voltage with ramp voltage respectively, and obtaining has phase difference
The first PWM and the 2nd PWM；
Step 3, the output that the first PWM and the 2nd PWM are controlled by driver to power bridge respectively.
Further, in the step 1, series resistance string one end in the digital analog converter is grounded, in electricity
The one of resistance both ends of resistance string export the first reference voltage and the second reference voltage respectively.
Further, the step 2 include following procedure: step 21, by the first reference voltage respectively with first slope electricity
Pressure and the second ramp voltage compare, export the first low and high level and the second low and high level respectively, by the second reference voltage respectively with
First slope voltage and the second ramp voltage compare, and export third low and high level and the 4th low and high level respectively；Step 22, by
One low and high level and the second low and high level are cached by the first latch, and when the first low and high level is 1, latch output is 1,
When the second low and high level is 1, latch output is 0, obtains the first PWM；Third low and high level and the 4th low and high level are passed through
Second latch caching, when third low and high level is 1, latch output is 1, and when the 4th low and high level is 1, latch is exported
It is 0, obtains the 2nd PWM.
The invention also discloses a kind of systems of accurate power control bridge output, including digital analog converter, the first ratio
It is driven compared with device, the second comparator, third comparator, the 4th comparator, the first latch, the second latch, the first driver, second
Dynamic device and load, the digital analog converter include resistance string, resistance string one end ground connection, external in the resistance string to draw
Line has between first reference voltage end and the second reference voltage end as the first reference voltage end and the second reference voltage end
There is the resistance in resistance string, first reference voltage end connects the input terminal of first comparator, institute with first slope voltage end
State the input terminal that the first reference voltage end connects the second comparator with the second reference voltage end, second reference voltage end and
One ramp voltage end connects the input terminal of third comparator, and second reference voltage end connects the 4th with the second ramp voltage end
The input terminal of comparator, the first comparator and the output end of the second comparator connect the first latch, and the third compares
The output end of device and the 4th comparator connects the second latch, and first latch and the second latch are separately connected driver
It is reconnected afterwards at the both ends of load.
Further, there is a resistance between first reference voltage end and the second reference voltage end.
Compared with prior art, having the beneficial effect that by adopting the above technical scheme
(1) present invention controls reference voltage using the digital analog converter (DAC) of high-res, can generate very little
PWM pairs of phase difference, and it is not necessarily to very high basic frequency, and the phase difference precision generated is very high, scalability is good；Again
Person, the PWM that the present invention generates can be with the outputs of accurate power control bridge；
(2) due to being not required to more micro-control units (MCU) can be used, using model with very high basic frequency in the present invention
It encloses very wide；
(3) method of the invention is easy to realize in integrated circuit technology.
Detailed description of the invention
Fig. 1 is the schematic illustration that small PWM phase difference is generated with high basic frequency.
Fig. 2 is that the present invention is shown by digital analog converter two reference voltages of generation to generate the principle of PWM phase difference
It is intended to.
Fig. 3 is the present invention for controlling the structural schematic diagram of control power output.
Specific embodiment
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
Any feature disclosed in this specification unless specifically stated can be equivalent or with similar purpose by other
Alternative features are replaced.That is, unless specifically stated, each feature is an example in a series of equivalent or similar characteristics
?.
The present embodiment uses first slope voltage RAMP1 and the second ramp voltage RAMP2.
There is the first reference voltage end and the second reference voltage end using digital analog converter (DAC), generate the first ginseng
Voltage V1 and the second reference voltage V2 are examined, wherein the first reference voltage V1 and the second reference voltage V2 has voltage difference delta V.
By the first reference voltage V1 and the second reference voltage difference V2 and first slope voltage RAMP1 and the second ramp voltage
RAMP2 is compared, and obtains and has dephased first PWM and the 2nd PWM；
As Figure 2-3, the first reference voltage end connects the input terminal of first comparator with first slope voltage end, by
One reference voltage V1 is compared with first slope voltage RAMP1, defeated when first slope voltage RAMP1 is greater than the first reference voltage V1
High level out, in this way the first low and high level S1 of acquisition；First reference voltage end connects the second comparator with the second ramp voltage end
Input terminal, by the first reference voltage V1 compared with the second ramp voltage RAMP2, when the second ramp voltage RAMP2 be greater than first
Reference voltage V1 exports high level, in this way the second low and high level R1 of acquisition；The output end of first comparator and the second comparator connects
It meets the first latch RS latch 1, the first low and high level S1 and the second low and high level R1 and passes through the first latch RS latch 1
Caching is 1 when the first low and high level S1 is 1 (when as high level) first latch RS latch 1 output, when the second height
First latch RS latch 1 output is 0 (as low level) when level R1 is 1, and the first latch RS latch 1 output is
For the first PWM1, the first PWM1 is obtained.Second reference voltage end connects the input terminal of third comparator with first slope voltage end,
By the second reference voltage V2 compared with first slope voltage RAMP1, when first slope voltage RAMP1 is greater than the second reference voltage
V2 exports high level, in this way acquisition third low and high level S2；Second reference voltage end connects the 4th ratio with the second ramp voltage end
Compared with the input terminal of device, by the second reference voltage V2 compared with the second ramp voltage RAMP2, when the second ramp voltage RAMP2 is greater than
Second reference voltage V2 exports high level, in this way the 4th low and high level R2 of acquisition；Third low and high level S2 and the 4th low and high level
R2 is cached by the second latch RS latch 2, when third low and high level S2 is 1 (when as high level) second latch RS
The output of latch 2 is 1, and when the 4th low and high level R2 is 1, the second latch RS latch 2 output is 0 (as low level),
Second latch RS latch 2 output is the 2nd PWM2, obtains the 2nd PWM2.The wherein width of the first PWM1, the 2nd PWM2
It is determined respectively by the first reference voltage V1 and the second reference voltage V2.The phase difference T of first PWM1 and the 2nd PWM2 is by first
The voltage difference of reference voltage V1 and the second reference voltage V2 determine.It is minimum by taking 10 binary digital analog converters as an example
One precision LSB=VFS/2^10 of an available digital analog converter, wherein VFS is full width voltage.
First PWM and the 2nd PWM are passed through into the both ends that driver acts on load load respectively, to control the defeated of power bridge
Out.When the first PWM1 is high level, by the driving of driver DRIVER1, the voltage VO1 for being output to load is exactly function
The voltage level of rate grade circuit output voltage VP；When the first PWM1 is low level, the voltage VO1 for being output to load is exactly to connect
The voltage level of ground voltage GND.Same reason passes through the drive of driver DRIVER2 when the 2nd PWM2 high level
Dynamic, the voltage VO2 (the generation process of voltage VO2 is not shown in Fig. 2) for being output to load is exactly power stage circuit output voltage
The voltage level of VP；When the 2nd PWM2 is low level, the voltage VO2 for being output to load is exactly the voltage of ground voltage GND
It is horizontal.Load load connects between VO1 and VO2, so only having voltage difference Shi Caiyou power output between them.This voltage
Poor VO1-VO2 is determined by the phase difference T of PWM1 and PWM2；This phase difference is exported by digital analog converter DAC again
Voltage difference determine.By taking 10 binary digital analog converters as an example, the precision of power regulationWherein R is the impedance of load, and D is numeral input, and Δ T is phase difference, and T is
The precision minimum in period, such power regulation is exactly 1/1024, if this precision can also improve with high-resolution DAC.
The invention is not limited to specific embodiments above-mentioned.The present invention, which expands to, any in the present specification to be disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.If this
Field technical staff is altered or modified not departing from the unsubstantiality that spirit of the invention is done, should belong to power of the present invention
The claimed range of benefit.
Claims (4)
1. a kind of method of control power bridge output, which is characterized in that including following procedure:
Step 1 generates the first reference voltage and the second reference voltage using digital analog converter；
Step 2 compares the first reference voltage and the second reference voltage with ramp voltage respectively, obtains tool dephased the
One PWM and the 2nd PWM；
The step 2 include following procedure: step 21, by the first reference voltage respectively with first slope voltage and the second slope electricity
Pressure ratio compared with, export the first low and high level and the second low and high level respectively, by the second reference voltage respectively with first slope voltage and
Second ramp voltage compares, and exports third low and high level and the 4th low and high level respectively；Step 22, by the first low and high level and
Two low and high levels are cached by the first latch, and when the first low and high level is 1, latch output is 1, when the second low and high level
Latch output is 0 when being 1, obtains the first PWM；Third low and high level and the 4th low and high level are delayed by the second latch
It deposits, when third low and high level is 1, latch output is 1, and when the 4th low and high level is 1, latch output is 0, obtains second
PWM；
Step 3, the output that the first PWM and the 2nd PWM are controlled by driver to power bridge respectively.
2. the method for control power bridge output as described in claim 1, which is characterized in that in the step 1, by the number
Series resistance string one end ground connection in analog converter exports first with reference to electricity at the one of resistance both ends of resistance string respectively
Pressure and the second reference voltage.
3. a kind of system of control power bridge output, which is characterized in that including digital analog converter, first comparator, second
Comparator, third comparator, the 4th comparator, the first latch, the second latch, the first driver, the second driver and negative
It carries, the digital analog converter includes resistance string, described resistance string one end ground connection, and external lead wire is as the in the resistance string
One reference voltage end and the second reference voltage end have resistance string between first reference voltage end and the second reference voltage end
In resistance, first reference voltage end connects the input terminal of first comparator with first slope voltage end, first ginseng
It examines voltage end and the second reference voltage end connects the input terminal of the second comparator, second reference voltage end and first slope electricity
The input terminal of press bond third comparator, second reference voltage end connect the 4th comparator with the second ramp voltage end
Input terminal, the first comparator and the output end of the second comparator connect the first latch, the third comparator and the 4th
The output end of comparator connects the second latch, and first latch and the second latch reconnect after being separately connected driver
At the both ends of load.
4. the system of control power bridge output as claimed in claim 3, which is characterized in that in the one of resistance of resistance string
Both ends export the first reference voltage and the second reference voltage respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710615602.1A CN107342676B (en) | 2017-07-26 | 2017-07-26 | A kind of method and system of control power bridge output |
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| CN201710615602.1A CN107342676B (en) | 2017-07-26 | 2017-07-26 | A kind of method and system of control power bridge output |
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| CN107342676A CN107342676A (en) | 2017-11-10 |
| CN107342676B true CN107342676B (en) | 2019-03-12 |
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| CN109980911B (en) * | 2019-03-29 | 2020-04-07 | 成都市易冲半导体有限公司 | Self-adaptive selection soft start circuit and method thereof |
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| JP2005109590A (en) * | 2003-09-26 | 2005-04-21 | Thine Electronics Inc | Switching amplifier circuit and class d amplifier for audio apparatus |
| US7005836B1 (en) * | 2004-09-10 | 2006-02-28 | Semiconductor Components Industries, L.L.C. | Differential power supply controller and method therefor |
| CN100466434C (en) * | 2005-02-10 | 2009-03-04 | 英特赛尔美国股份有限公司 | Pwm controller with dual-edge modulation using dual ramps |
| CN100580608C (en) * | 2006-08-30 | 2010-01-13 | 晶豪科技股份有限公司 | Low power reference voltage circuit |
| JP5130944B2 (en) * | 2008-02-14 | 2013-01-30 | ミツミ電機株式会社 | DC-DC converter and power supply control semiconductor integrated circuit |
| EP2189870A1 (en) * | 2008-11-25 | 2010-05-26 | St Microelectronics S.A. | A switch-mode voltage regulator |
| CN102751872B (en) * | 2011-04-21 | 2016-04-06 | 登丰微电子股份有限公司 | Feedback control circuit |
| 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 |
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Address after: 610000 Chengdu China (Sichuan) Free Trade Pilot Zone, Chengdu City, Sichuan Province, West Side of Building No. 10, District A, Tianfu Jingrong Center, 303 Xinglong Street, Tianfu New District, Chengdu City Applicant after: Chengdu Yichong Semiconductor Co., Ltd. Address before: 610000 South section of Tianfu Avenue, Tianfu New District, Chengdu City, Sichuan Province 2039 and 1609, 16th floor, Mei Haitang Center (Tianfu Chuangke) Applicant before: Chengdu Yi Chong Wireless Technology Co., Ltd. |
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Denomination of invention: A method and system for controlling the output of power bridge Effective date of registration: 20201010 Granted publication date: 20190312 Pledgee: Chengdu SME financing Company Limited by Guarantee Pledgor: CHENGDU YICHONG WIRELESS POWER TECHNOLOGY Co.,Ltd. Registration number: Y2020980006682 |
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Date of cancellation: 20210709 Granted publication date: 20190312 Pledgee: Chengdu SME financing Company Limited by Guarantee Pledgor: CHENGDU YICHONG WIRELESS POWER TECHNOLOGY Co.,Ltd. Registration number: Y2020980006682 |