CN108400708A - A kind of pulsewidth Linear voltage-adjusting circuit applied to DC/DC outputs - Google Patents
A kind of pulsewidth Linear voltage-adjusting circuit applied to DC/DC outputs Download PDFInfo
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- CN108400708A CN108400708A CN201810326175.XA CN201810326175A CN108400708A CN 108400708 A CN108400708 A CN 108400708A CN 201810326175 A CN201810326175 A CN 201810326175A CN 108400708 A CN108400708 A CN 108400708A
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- pulsewidth
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- linear voltage
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- 210000001367 artery Anatomy 0.000 claims 2
- 210000003462 vein Anatomy 0.000 claims 2
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- 239000011800 void material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
-
- 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
- H02M1/0045—Converters combining the concepts of switch-mode regulation and linear regulation, e.g. linear pre-regulator to switching converter, linear and switching converter in parallel, same converter or same transistor operating either in linear or switching mode
Abstract
The present invention relates to a kind of pulsewidth Linear voltage-adjusting circuits applied to DC/DC outputs, the circuit includes PWM controller, pulse wide voltage-regulation sub-circuit and DC/DC Translator subcircuits, input of the adjustable square-wave signal of PWM controller output duty cycle as pulse wide voltage-regulation sub-circuit, the feedback signal of the pulse wide voltage-regulation sub-circuit is as the feed back input as DC/DC converters in DC/DC Translator subcircuits.Compared with prior art, the present invention has many advantages, such as to export variable voltage, linear voltage regulation in real time.
Description
Technical field
The present invention relates to DC/DC circuit fields, more particularly, to a kind of pulsewidth linear voltage regulation electricity applied to DC/DC outputs
Road.
Background technology
DC/DC conversion circuits are a kind of turns that high pressure (low pressure) DC power supply is transformed to low pressure (high pressure) DC power supply
Circuit is changed, the output voltage after transformation can be fixed voltage value, can also be variable voltage value.For exporting variable voltage
Value, traditional way are to carry out mechanical adjustment using potentiometer, and such mode can not be efficiently applied to output voltage and become in real time
In the scene of change.
Invention content
It is defeated applied to DC/DC that it is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind
The pulsewidth Linear voltage-adjusting circuit gone out.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of pulsewidth Linear voltage-adjusting circuit applied to DC/DC outputs, the circuit include PWM controller, pulse wide voltage-regulation
Circuit and DC/DC Translator subcircuits, the adjustable square-wave signal of PWM controller output duty cycle is as pulse wide voltage-regulation
The feedback signal of the input of circuit, the pulse wide voltage-regulation sub-circuit is used as DC/DC to convert as in DC/DC Translator subcircuits
The feed back input of device.
The pulse wide voltage-regulation sub-circuit include first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance,
6th resistance and the first capacitance, the output end of the PWM controller, the 4th resistance, 3rd resistor, DC/DC converters it is anti-
Feedback input terminal is sequentially connected, and the output end of the PWM controller is connect by the 5th resistance with electric power network, and the described the 6th
Resistance one end is connected between the 4th resistance and 3rd resistor, and other end ground connection, the first described capacitance one end is connected to the 4th
Between resistance and 3rd resistor, other end ground connection, described first resistor one end is connect with 3rd resistor, the other end and output electricity
Press bond, described second resistance one end are connect with 3rd resistor, other end ground connection.
The DC/DC Translator subcircuits further include the first inductance and the second capacitance, and the DC/DC converters are opened
OFF signal output end is connect by the first inductance with output voltage terminal, the second described capacitance one end and the first inductance connection, separately
One end is grounded.
The second resistance is to place resistance or potentiometer.
The pulsewidth Linear voltage-adjusting circuit is to realize linear voltage regulation function, the linear voltage regulation formula：
Vout=Vmax-(Vmax-Vmin)*Duty
Wherein, VmaxFor exportable maximum voltage, VminFor exportable minimum voltage, VoutFor actual output voltage,
Duty is the duty ratio of pwm input signal.
The resistance value of the second resistance is less than 20K Ω, and the resistance value of the 6th resistance is less than 10K Ω, the electricity
The voltage value of source network is 1.8V or 3.3V, and the feedback voltage level of the DC/DC converters is 0.6V.
Compared with prior art, the present invention has the following advantages：
The present invention realizes DC/DC output voltages continuous variable in a certain range, actual test knot by PWM pulse-width regulateds
Fruit and agreement with theoretical calculation, can realize the pressure regulation of different range according to variation of parameter, realize potentiometer mechanical adjustment without
Method exports the function of variable voltage in real time.
Description of the drawings
Fig. 1 is the topological schematic diagram of pulse wide voltage-regulation sub-circuit.
Fig. 2 is the circuit diagram of DC/DC Translator subcircuits.
Fig. 3 is DC/DC maximum voltage output equivalent circuits.
Fig. 4 a are the disconnected equivalent circuit of current source void.
Fig. 4 b are the empty short equivalent circuit of voltage source.
Fig. 5 is up/down pull-up resistor equivalent circuit inside PWM controller.
Fig. 6 is single order RC filter circuits.
Specific implementation mode
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
The present invention provides a kind of easy hardware circuit topologys, realize output voltage in a certain range based on pulse-width regulated
Interior continuous variable solves the drawbacks of using potentiometer mechanical adjustment with extremely low cost and extremely simple structure, as shown in Figure 1,
The hardware circuit topology of pulse wide voltage-regulation sub-circuit shown in the present invention is as follows, including six resistance and a capacitance, six resistance
Be R1, R2, R3, R4, R5, R6, one capacitances respectively it is C1；Include additionally four road interfaces, is controller electricity where PWM respectively
The electric power network VDDIO of source domain, input signal PWM, output voltage DC/DC_out and feedback network DC/DC_FB；Input terminal
Signal is pwm signal (PWM：Pulsewidth modulation), pwm signal is exported by controller, is the square-wave signal of variable duty ratio；Output end
Signal DC/DC_out is connected to the voltage output pin of DC/DC conversion chips, exports variable DC voltage；Feedback network signal
DC/DC_FB is connected to the Voltage Feedback pin of DC/DC conversion chips；VDDIO provides DC voltage, direct current piezoelectricity for circuit
Flat selection requires to set according to controller.
Fig. 2 is chip pin description and the peripheral applications circuit for the DC/DC Translator subcircuits that the present invention uses.It is common
DC/DC converters (such as product SY8088 of silergy companies) pin 4 and pin 1 be respectively voltage input pin and
Enable pin is usually connected by enable pin with voltage input pin, is powered by external dc voltage DC/DC_in；Commonly
The pin 3 of DC/DC converters is switching signal output pin, and DC voltage DC/DC_ is realized by connecting inductance L1 and capacitance C0
Out is exported, and pin 5 is the input pin of feedback signal DC/DC_FB, and pipe is connected to as feed back input in the junctions R1 and R2
Foot 5；Wherein, when R2 is to place resistance, then DC/DC_out outputs are fixed voltage；If R2 is replaced resistance using potentiometer,
Variable voltage can be exported by mechanical adjustment potentiometer.
The circuit function of the present invention is as follows：
Functional relation as shown in Table 1, the present invention is realized changes voltage output based on first-order linear described in the function；
Under the premise of two parameters of ceiling voltage during function is determined and minimum voltage, it can be realized by adjusting duty ratio variable
Output voltage values.When DC/DC pulse wide voltage-regulation circuits work, acquiescence output voltage is the Type values in table 1, by adjusting PWM
The width of the square wave high level of output, i.e. duty ratio, realize the variation of output voltage；When input square wave high level width is
100%, i.e. duty ratio is 100%, and output voltage is Vmin values in table 1 at this time；It is 0 when inputting square wave high level width, that is, accounts for
Sky is than being 0%, and output voltage is Vmax values in table 1 at this time；Between input square wave high level duty ratio is 0% to 100%
When some value, output voltage is the functional relation in table；Two parameters of Max and Min in table 1 can be repaiied according to actual demand
Change.The present invention is with Vmax=1.4V, and for Vmin=0.8V as actual verification circuit, new function can be obtained by being substituted into equation
Relationship：
Vout=1.4- (1.4-0.8) * Duty；
1 output voltage functional relation table of table
Table 2A input parameter tables
Table 2B output parameter tables
Wherein, voltage unit V (volt), unit of resistance KOhm (kilohm), chronomere uS (microsecond), unit of capacity nF
(nano farad)；
Vout：The exportable virtual voltage of DC/DC pulse wide voltage-regulation circuits；
Vmax：The exportable maximum voltage of DC/DC pulse wide voltage-regulation circuits；
Vtype：The exportable reset default voltage of DC/DC pulse wide voltage-regulation circuits；
Vmin：The exportable minimum voltage of DC/DC pulse wide voltage-regulation circuits；
VDDIO：Controller power source domain VDDIO voltage values where PWM；
DC/DC_FB：DC/DC internal reference voltage values, common is 0.6V or 0.8V；
R2：Generally 200K ohm or less resistance；
R6：The generally following resistance of 10K ohmic resistances；The present invention is by taking 12KOhm as an example；
Up/down is drawn inside R5, PWM:It needs to export source chip requirement according to PWM；The present invention is by taking 60KOhm as an example；
Pressure regulation time t：Refer to after PWM duty cycle variation, output voltage reaches 99% time needed of target voltage values；
Design principle of the present invention is as follows：
In order to which Linear voltage-adjusting circuit described in equation Vout=Vmax- (Vmax-Vmin) * Duty, this hair may be implemented
Bright to propose corresponding hardware circuit topology, physical circuit is as shown in Fig. 1 dotted line frames；Each section design parameter in circuit topology
Determination depend on given input parameter value, output parameter value is calculated by input parameter value；Input parameter and output are joined
Number constructs final pulsewidth Linear voltage-adjusting circuit topology together；
Circuit input parameter：
VDDIO, the present invention can be 3.3V or other voltage values by taking 1.8V as an example；
The maximum voltage of DC/DC outputs, the present invention is by taking 1.4V as an example, and minimum voltage is by taking 0.8V as an example；
DC/DC_FB feedback voltage level Vfb, the present invention are to refer to (to be wanted according to the DC/DC converters actually selected with 0.6V
Depending on asking)；
R2 resistances, the present invention is by taking 200KOhm as an example (depending on the DC/DC converter requirements actually selected).
The specific calculating process of output parameter：
The parameters relationship of the DC/DC converter chip requirements used according to the present invention calculates, it is known that R2 resistance value 200KOhm,
R1 resistance values, R1=(Vtype-Vfb)/(Vfb/R2)=(0.9-0.6)/(0.6/200K)=100KOhm can be calculated；
When DC/DC exports maximum voltage, PWM inputs are 0V, i.e. are equivalent to be grounded on the left of R4, as shown in Figure 3；Thus it counts
It calculates：(R3+R4//R6) (electric current for flowing through R1 is equal to equivalent resistance=100k/ ((1.4-0.6)/0.6)=75k of //R2
The total current of equivalent circuit below)；(R3+R4//R6)=1/ (1/75-1/200)=120k=R3；
When DC/DC exports minimum voltage, PWM inputs are VDDIO (present invention is verified with VDDIO=1.8V) direct current
Voltage value, at this point, electric current (the 0.8-0.6)/100k=2uA for flowing through R1 is calculated, flow through the electric current (0.6-0.0) of R2/
200k=3uA；Illustrate that also 1uA is the electric current for flowing through R3, left-to-right flow direction, I3=1uA；
Therefore when DC/DC exports minimum voltage, the absorption current source that an equivalent starting voltage is 0.6V on the right side of R3,
Electric current 1uA is absorbed, current source is equivalent to void in Thevenin's theorem and breaks, is equivalent to open a way on the right side of R3；Such as Fig. 4 a；It can obtain
1.8V/ (R4+R6) * R6=Vr6
VDDIO is as ideal voltage source, voltage source equivalent void short circuit in Thevenin's theorem, such as Fig. 4 b；Therefore equivalent
R4 left side grounds；Obtain Vr6=I3*R3 "/1000+0.6=0.72V
The equation that two kinds of equivalent circuits obtain passes through Vr6 equivalences：
1.8V/ (R4+R6) * R6=Vr6=I3*R3 "/1000+0.6=0.72V, obtain R4=1.5*R6=18KOhm；
R3=R3 "-R4//R6=120K-7.2K=112.8KOhm may further be acquired；
There are up/down pull-up resistors inside the controller of output pwm signal, as shown in figure 5, calculating R5 based on this；
Pull-up resistor configures：R5//Rpu=(1.8V-1.5V)/(0.6V/12k)=6k, can calculate R5=6.7kOhm；
Pull down resistor configures：Rpd//(R4+R6)=60k//30k=20k；Calculate R5=(1.8V-1.5V)/(1.5V/
20k)=4kOhm；
Rpu equivalent pull-up resistors inside device in order to control；Rpd equivalent pull down resistors inside device in order to control；
R4, R6 and C1 collectively constitute the RC first-order low-pass wave circuits described in Fig. 6, which realizes the square wave of input
Signal is converted into DC voltage, but there are time-delay characteristics for filter, and reaching target voltage values when directly resulting in each pressure regulation needs
The regular hour is wanted, the following equation of voltage characteristic of single order RC filtering：U0=Ui* (1-e^ (- t/rc)), pressure regulation timing definition are
Charging pressure-boosting can obtain e^ [- t/ (r*C1)]=1-0.99 to the 99% of target voltage, release t=4.6* (R4//
R6) * C1=330uS, calculating can obtain C1=9.96nF；E is the nature truth of a matter 2.71828 in formula；
R4//R6 indicates that resistance R4 and resistance R6 is in parallel, // for symbol in parallel, in text, elsewhere description is herewith；
Practical application circuit is built and verification result：
The pulse wide voltage-regulation circuit based on DC/DC, the DC/DC converter chips of selection are built according to the result of theoretical calculation
Feedback network DC/DC_FB be 0.6V；VDDIO uses 1.8V power voltage supplies；Up/down pull-up resistor resistance inside the controller of selection
Value is 60KOhm, this verification is configured using controller internal pull-up resistor；
The resistance and capacitance parameter value and practical common parameter value gone out due to theoretical calculation is not fully identical, actually answers
It in, is verified as close as reason calculated value, therefore as shown in table 3, actually uses R3 in parameter and use
118KOhm, R5 (configuration of controller internal pull-up resistor) use 6.8KOhm, C1 to use 10nF, remaining device parameters chooses and reason
It is consistent by calculated value；
Find out from 3 experimental result of table, actual test result and theoretical calculation are very close, and error is in 0.5%.
3 actual test result of table
Claims (6)
1. a kind of pulsewidth Linear voltage-adjusting circuit applied to DC/DC outputs, which is characterized in that the circuit includes PWM controller, arteries and veins
Wide-voltage-regulation sub-circuit and DC/DC Translator subcircuits, the adjustable square-wave signal of PWM controller output duty cycle is as arteries and veins
The input of wide-voltage-regulation sub-circuit, the feedback signal of the pulse wide voltage-regulation sub-circuit is as conduct in DC/DC Translator subcircuits
The feed back input of DC/DC converters.
2. a kind of pulsewidth Linear voltage-adjusting circuit applied to DC/DC outputs according to claim 1, which is characterized in that institute
The pulse wide voltage-regulation sub-circuit stated includes first resistor (R1), second resistance (R2), 3rd resistor (R3), the 4th resistance (R4),
Five resistance (R5), the 6th resistance (R6) and the first capacitance (C1), the output end of the PWM controller, the 4th resistance (R4),
Three resistance (R3), DC/DC converters feedback input end be sequentially connected, the output end of the PWM controller passes through the 5th electricity
Resistance (R5) is connect with electric power network (VDDIO), and the 6th described one end resistance (R6) is connected to the 4th resistance (R4) and third electricity
Between hindering (R3), other end ground connection, described one end the first capacitance (C1) is connected to the 4th resistance (R4) and 3rd resistor (R3)
Between, other end ground connection, first resistor one end (R1) is connect with 3rd resistor (R3), and the other end connects with output voltage terminal
It connects, second resistance one end (R2) is connect with 3rd resistor (R3), other end ground connection.
3. a kind of pulsewidth Linear voltage-adjusting circuit applied to DC/DC outputs according to claim 2, which is characterized in that institute
The DC/DC Translator subcircuits stated further include the first inductance (L1) and the second capacitance (C0), the switch of the DC/DC converters
Signal output end is connect by the first inductance (L1) with output voltage terminal, described the second capacitance one end (C0) and the first inductance
(L1) it connects, other end ground connection.
4. a kind of pulsewidth Linear voltage-adjusting circuit applied to DC/DC outputs according to claim 2, which is characterized in that institute
The second resistance (R2) stated is to place resistance or potentiometer.
5. a kind of pulsewidth Linear voltage-adjusting circuit applied to DC/DC outputs according to claim 3, which is characterized in that should
Pulsewidth Linear voltage-adjusting circuit is to realize linear voltage regulation function, the linear voltage regulation formula：
Vout=Vmax-(Vmax-Vmin)*Duty
Wherein, VmaxFor exportable maximum voltage, VminFor exportable minimum voltage, VoutFor actual output voltage, Duty is
The duty ratio of pwm input signal.
6. a kind of pulsewidth Linear voltage-adjusting circuit applied to DC/DC outputs according to claim 2, which is characterized in that institute
The resistance value for the second resistance (R2) stated is less than 20K Ω, and the resistance value of the 6th resistance (R6) is less than 10K Ω, the power supply
The voltage value of network (VDDIO) is 1.8V or 3.3V, and the feedback voltage level of the DC/DC converters is 0.6V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810326175.XA CN108400708B (en) | 2018-04-12 | 2018-04-12 | Pulse width linear voltage regulating circuit applied to DC/DC output |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810326175.XA CN108400708B (en) | 2018-04-12 | 2018-04-12 | Pulse width linear voltage regulating circuit applied to DC/DC output |
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| Publication Number | Publication Date |
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| CN108400708A true CN108400708A (en) | 2018-08-14 |
| CN108400708B CN108400708B (en) | 2024-01-23 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109039056A (en) * | 2018-08-15 | 2018-12-18 | 晶晨半导体（深圳）有限公司 | DCDC switching power unit |
| CN109347324A (en) * | 2018-11-21 | 2019-02-15 | 晶晨半导体(上海)股份有限公司 | Power circuit and the method for reducing power supply output error |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030151933A1 (en) * | 2002-02-14 | 2003-08-14 | Fujitsu Limited | DC-DC converter, duty-ratio setting circuit and electric appliance using them |
| US20080067987A1 (en) * | 2006-09-15 | 2008-03-20 | Chun-Chin Tung | Variable voltage regulating device |
| US20130038312A1 (en) * | 2011-08-12 | 2013-02-14 | Upi Semiconductor Corp. | Multi-phase dc-dc power converter |
| CN208078898U (en) * | 2018-04-12 | 2018-11-09 | 上海健康医学院 | A kind of pulsewidth Linear voltage-adjusting circuit applied to DC/DC outputs |
-
2018
- 2018-04-12 CN CN201810326175.XA patent/CN108400708B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030151933A1 (en) * | 2002-02-14 | 2003-08-14 | Fujitsu Limited | DC-DC converter, duty-ratio setting circuit and electric appliance using them |
| US20080067987A1 (en) * | 2006-09-15 | 2008-03-20 | Chun-Chin Tung | Variable voltage regulating device |
| US20130038312A1 (en) * | 2011-08-12 | 2013-02-14 | Upi Semiconductor Corp. | Multi-phase dc-dc power converter |
| CN208078898U (en) * | 2018-04-12 | 2018-11-09 | 上海健康医学院 | A kind of pulsewidth Linear voltage-adjusting circuit applied to DC/DC outputs |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109039056A (en) * | 2018-08-15 | 2018-12-18 | 晶晨半导体（深圳）有限公司 | DCDC switching power unit |
| CN109347324A (en) * | 2018-11-21 | 2019-02-15 | 晶晨半导体(上海)股份有限公司 | Power circuit and the method for reducing power supply output error |
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| Publication number | Publication date |
|---|---|
| CN108400708B (en) | 2024-01-23 |
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