CN104868718B - A kind of booster circuit - Google Patents
A kind of booster circuit Download PDFInfo
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- CN104868718B CN104868718B CN201510228067.5A CN201510228067A CN104868718B CN 104868718 B CN104868718 B CN 104868718B CN 201510228067 A CN201510228067 A CN 201510228067A CN 104868718 B CN104868718 B CN 104868718B
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- booster circuit
- digital regulation
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—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
- H02M3/07—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 using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
Abstract
The present invention discloses a kind of booster circuit,The first voltage sample circuit being connected with pwm circuit is made up of the first resistor and digital regulation resistance connected,And second voltage sample circuit and controller are additionally provided with the booster circuit,In booster circuit running,Controller determines the magnitude of voltage of the first end of storage capacitor according to the output of second voltage sample circuit,And the pressure drop according to caused by the target output voltage of booster circuit determines storage capacitor,Controller determines the goal-setting voltage of booster circuit according to the target output voltage of the pressure drop and booster circuit afterwards,And utilize the resistance of goal-setting voltage adjustment digital regulation resistance,The voltage of first end of storage capacitor is enabled to reach the goal-setting voltage,So that the output voltage of booster circuit can reach target output voltage,It ensure that the boost capability of booster circuit remains to keep stable at low ambient temperatures.In addition, booster circuit disclosed by the invention realizes the stepless changing of output voltage.
Description
Technical field
The invention belongs to power supply technique field, more particularly to a kind of booster circuit.
Background technology
Booster circuit is needed to use in the engine of motor vehicle, the output accuracy of booster circuit is directly connected to engine
Runnability.For example, to set booster circuit in the fuel injector of engine, the output accuracy of the booster circuit directly affects spray
The opening speed of oily device magnetic valve, so as to influence the control accuracy of fuel injector.
Fig. 1 is a kind of structural representation of existing booster circuit, and the booster circuit includes energy storage inductor 01, rectifying and wave-filtering
Circuit 02, storage capacitor 03, power switch 04, PWM (pulse width modulation) circuit 05, current sampling circuit 06 and Voltage Feedback
Circuit 07.Wherein, the first end of energy storage inductor 01 is connected as the input of booster circuit, with one end of power supply 08, energy storage electricity
Second end of sense 01 is connected by current rectifying and wave filtering circuit 02 with the first end of storage capacitor 03, the second end conduct of storage capacitor 03
The output end of booster circuit.The input of power switch 04 is connected with the second end of energy storage inductor 01, the output of power switch 04
End is connected by current sampling circuit 06 with the other end of power supply 08, and the control terminal of power switch 04 is connected with pwm circuit 05.Electricity
The output end of stream sample circuit 06 is connected with the current sample port of pwm circuit 05, the output end and PWM of voltage feedback circuit 07
The voltage sample port connection of circuit 05, pwm circuit 05 is according to the output control of current sampling circuit 06 and voltage feedback circuit 07
The periodicity turn-on and turn-off of power switch 04 processed, so that booster circuit output presets the electric energy of voltage.
But existing booster circuit existing defects：When the temperature of the surroundings is low, the boost capability of booster circuit declines,
The voltage of the electric energy of output is caused to be unable to reach magnitude of voltage set in advance.
The content of the invention
In view of this, it is an object of the invention to provide a kind of booster circuit, its boost capability is when environment temperature is relatively low
Keep stable, the magnitude of voltage of its electric energy exported can reach magnitude of voltage set in advance.
To achieve the above object, the present invention provides following technical scheme：
A kind of booster circuit, including energy storage inductor, current rectifying and wave filtering circuit, storage capacitor, power switch, pwm pulse width
Modulation circuit, current sampling circuit, first voltage sample circuit, second voltage sample circuit and controller；
The first voltage sample circuit includes first resistor and digital regulation resistance, the first resistor and the numeral electricity
It is connected to after the device series connection of position between first end and the earth terminal of the storage capacitor, the first resistor and the digital current potential
The common port of device is connected with the voltage sample port of the pwm circuit, and the first end of the storage capacitor is the booster circuit
Output end；
The second voltage sample circuit is used to sample the output voltage of the booster circuit；
The controller is connected with the second voltage sample circuit and the digital regulation resistance respectively, the controller root
Equivalent string in the storage capacitor is determined according to the target output voltage of the booster circuit and the output voltage of the booster circuit
Pressure drop caused by joining resistance, determines the current goal-setting voltage of the booster circuit, the goal-setting voltage is institute afterwards
Target output voltage and the pressure drop sum are stated, the target for determining the digital regulation resistance according to the goal-setting voltage hinders
Value, afterwards adjusts the resistance of the digital regulation resistance to the target resistance.
Preferably, in above-mentioned booster circuit, the first end of the first resistor is connected with the first end of the storage capacitor,
Second end of the first resistor is connected with the first end of the digital regulation resistance, the second end and the ground connection of the digital regulation resistance
End connection.
Preferably, in above-mentioned booster circuit, the controller determines the digital current potential according to the goal-setting voltage
The target resistance of device, it is：
According to formulaCalculate the target resistance of the digital regulation resistance；
Wherein, R2 is the target resistance of the digital regulation resistance, and R1 is the resistance of the first resistor, and U is the target
Set voltage, UrefFor the reference voltage of the pwm circuit.
Preferably, in above-mentioned booster circuit, the first end of the digital regulation resistance and the first end of the storage capacitor connect
Connect, the second end of the digital regulation resistance is connected with the first end of the first resistor, and the second end of the first resistor is with connecing
Ground terminal connects.
Preferably, in above-mentioned booster circuit, the controller determines the digital current potential according to the goal-setting voltage
The target resistance of device, it is：
According to formulaCalculate the target resistance of the digital regulation resistance；
Wherein, R2 is the target resistance of the digital regulation resistance, and R1 is the resistance of the first resistor, and U is the target
Set voltage, UrefFor the reference voltage of the pwm circuit.
Preferably, in above-mentioned booster circuit, the second voltage sample circuit includes 3rd resistor and the 4th resistance；
The first end of the 3rd resistor connects with the first end of the storage capacitor, the second end of the 3rd resistor with
The first end connection of 4th resistance, the second end connection earth terminal of the 4th resistance；
The voltage sample port of the controller is connected with the common port of the 3rd resistor and the 4th resistance, described
Controller determines the voltage of the first end of the storage capacitor according to the voltage at the 4th resistance both ends.
As can be seen here, beneficial effects of the present invention are：In booster circuit disclosed by the invention, be connected with pwm circuit
One voltage sampling circuit is made up of the first resistor and digital regulation resistance connected, and the second electricity is additionally provided with the booster circuit
Sample circuit and controller are pressed, in booster circuit running, controller determines according to the output of second voltage sample circuit
The magnitude of voltage at the second end of storage capacitor, and the pressure drop according to caused by the target output voltage of booster circuit determines storage capacitor,
Controller determines the goal-setting voltage of booster circuit according to the target output voltage of the pressure drop and booster circuit afterwards, and utilizes
The goal-setting voltage adjusts the resistance of digital regulation resistance so that the voltage of the first end of storage capacitor can reach the target and set
Determine voltage, so that the output voltage of booster circuit can reach target output voltage, ensure that the boosting energy of booster circuit
Power remains to keep stable at low ambient temperatures.In addition, booster circuit disclosed by the invention, can be by adjusting digital regulation resistance
Resistance adjusts output voltage, realizes the stepless changing of output voltage.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is a kind of structural representation of existing booster circuit；
Fig. 2 is a kind of structural representation of booster circuit disclosed by the invention；
Fig. 3 is the structural representation of another booster circuit disclosed by the invention；
Fig. 4 is the structural representation of another booster circuit disclosed by the invention.
Embodiment
It is found by the applicant that：Limited by manufacturing process and material, capacitor equivalent is the electric capacity and resistance of series connection, and the resistance can
Regard the equivalent series resistance of electric capacity as.With the reduction of temperature, the resistance of the equivalent series resistance can accordingly increase, in low temperature ring
Under border, the equivalent series resistance can reach several ohm, and a larger pressure drop is produced at electric capacity both ends, and this results in boosting electricity
Target output voltage of the output voltage on road less than setting.The target output voltage of booster circuit refers to：Set by system
The desired output voltage of booster circuit.
The present invention discloses a kind of booster circuit, and the boost capability of the booster circuit keeps stable when environment temperature is relatively low,
The magnitude of voltage of its electric energy exported can reach magnitude of voltage set in advance.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Referring to Fig. 2, Fig. 2 is a kind of structural representation of booster circuit disclosed by the invention.The booster circuit includes energy storage
Inductance 1, current rectifying and wave filtering circuit 2, storage capacitor 3, power switch 4, pwm circuit 5, current sampling circuit 6, first voltage sampling electricity
Road 7, second voltage sample circuit 8 and controller 9.
Wherein：
The first end of energy storage inductor 1 is connected as the input of booster circuit, with one end of power supply 10, energy storage inductor 1
Second end is connected by current rectifying and wave filtering circuit 2 with the first end of storage capacitor 3, and the second end of storage capacitor 3 is as booster circuit
Output end.
The input of power switch 4 is connected with the second end of energy storage inductor 1, and the output end of power switch 4 is adopted by electric current
Sample circuit 6 is connected with the other end of power supply 10, and the control terminal of power switch 4 is connected with pwm circuit 5.Current sampling circuit 6 it is defeated
Go out end to be connected with the current sample port of pwm circuit 5.
First voltage sample circuit 7 includes first resistor R1 and digital regulation resistance R2.Specifically, first resistor R1 and numeral
It is connected to after potentiometer R2 series connection between first end and the earth terminal of storage capacitor 3, first resistor R1 and digital regulation resistance R2
Common port be connected with the voltage sample port of pwm circuit 5, the second end of storage capacitor 2 is the output end of booster circuit.
In booster circuit shown in Fig. 1, first resistor R1 first end is connected with the first end of storage capacitor 3, the first electricity
Resistance R1 the second end is connected with digital regulation resistance R2 first end, and digital regulation resistance R2 the second end is connected with earth terminal.
The voltage sample port of pwm circuit 5 is connected with first resistor R1 and digital regulation resistance R2 common port, pwm circuit 5
Current sample port be connected with the output end of current sampling circuit 6, pwm circuit 5 is according to first voltage sample circuit 7 and electric current
The periodicity turn-on and turn-off of output control power switch 4 of sample circuit 6.
After pwm circuit 5 controls power switch 4 to turn on, electric current is adopted by power supply 10- energy storage inductor 1- power switch 4- electric currents
Sample circuit 6- power supplys 10 form loop, and energy storage inductor 1 starts energy storage, and in the process, current sampling circuit 6 detects inductive energy storage
Energy in loop, after the energy in inductive energy storage loop reaches predetermined value, pwm circuit 5 controls power switch 4 to turn off,
Complete the thermal energy storage process of energy storage inductor 1.After pwm circuit 5 controls power switch 4 to turn off, energy storage inductor 1 passes through rectifying and wave-filtering
Circuit 2 is that storage capacitor 3 charges.After the electric discharge of energy storage inductor 1 terminates, pwm circuit 5 controls power switch conducting, starts next
Individual charge and discharge cycles.Storage capacitor 3 is exported to corresponding load as power supply.
Second voltage sample circuit 8 is used to sample the magnitude of voltage at the second end of storage capacitor 3, that is, to boosting
The output voltage of circuit is sampled.
Controller 9 is connected with second voltage sample circuit 8 and digital regulation resistance R2 respectively.Controller 9 is according to booster circuit
Target output voltage and the voltage at the second end of storage capacitor 3 determine pressure drop caused by storage capacitor 3, determine boosting electricity afterwards
The current goal-setting voltage in road.Wherein, goal-setting voltage is target output voltage and the sum of the pressure drop.Afterwards, controller 9
Digital regulation resistance R2 target resistance is determined according to goal-setting voltage, afterwards adjusts digital regulation resistance R2 resistance to the mesh
Mark resistance.
Controller 9 is connected with second voltage sample circuit 8, can be determined to store up according to the output of second voltage sample circuit 8
The magnitude of voltage at the second end of energy electric capacity 3.Controller 9 is according to the target output voltage of booster circuit and the second end of storage capacitor 3
Voltage, it is possible to determine pressure drop caused by storage capacitor 3 under current environment, afterwards controller 9 using the pressure drop and boosting electricity
The target output voltage on road determines the current goal-setting voltage of booster circuit, and digital current potential is adjusted using the goal-setting voltage
Device R2 resistance so that the voltage of the first end of storage capacitor 3 can reach the goal-setting voltage, so that booster circuit
Output voltage can reach target output voltage.
In booster circuit disclosed by the invention, the first voltage sample circuit being connected with pwm circuit is electric by connect first
Resistance and digital regulation resistance are formed, and second voltage sample circuit and controller are additionally provided with the booster circuit, in boosting electricity
In the running of road, controller determines the magnitude of voltage at the second end of storage capacitor according to the output of second voltage sample circuit, and
The pressure drop according to caused by the target output voltage of booster circuit determines storage capacitor, controller is according to the pressure drop and boosting electricity afterwards
The target output voltage on road determines the goal-setting voltage of booster circuit, and utilizes goal-setting voltage adjustment digital regulation resistance
Resistance so that the voltage of the first end of storage capacitor can reach the goal-setting voltage, so that booster circuit is defeated
Target output voltage can be reached by going out voltage, ensure that the boost capability of booster circuit remains to keep stable at low ambient temperatures.
In addition, booster circuit disclosed by the invention, can adjust output voltage by adjusting the resistance of digital regulation resistance, realize defeated
Go out the stepless changing of voltage.
When first voltage sample circuit 7 is using structure shown in Fig. 2, controller 9 determines number according to goal-setting voltage
The target resistance of word potentiometer, formula 1 can be used：
Wherein, R2 is the target resistance of digital regulation resistance, and R1 is the resistance of first resistor, and U is goal-setting voltage, Uref
For the reference voltage of pwm circuit 5.
It is briefly described below：
By the control of pwm circuit 5, booster circuit enters the public affairs of stable state, first resistor R1 and digital regulation resistance R2
The reference voltage U of the magnitude of voltage held altogether and pwm circuit 5refIt is identical.Now the magnitude of voltage of the first end of energy storage inductor 3 is (namely
The goal-setting voltage U of booster circuit) meet formula 2：
U=(R1+R2)/R2 ★ Uref(formula 2)
In formula 2, first resistor R1 resistance, the reference voltage U of pwm circuit 5refWith the goal-setting of booster circuit
Voltage is all known quantity, so as to be assured that the target resistance of digital regulation resistance.
In addition, first voltage sample circuit 7 can also use the structure shown in Fig. 3.
Referring to Fig. 3, Fig. 3 is the structural representation of another booster circuit disclosed by the invention.The booster circuit includes storage
Can inductance 1, current rectifying and wave filtering circuit 2, storage capacitor 3, power switch 4, pwm circuit 5, current sampling circuit 6, first voltage sampling
Circuit 7, second voltage sample circuit 8 and controller 9.Here first voltage sample circuit 7 is illustrated emphatically, other parts
Refer to and be described above.
First voltage sample circuit 7 includes first resistor R1 and digital regulation resistance R2.Specifically, the of digital regulation resistance R2
One end is connected with the first end of storage capacitor 3, and the second end of digital regulation resistance is connected with first resistor R1 first end, the first electricity
Resistance R1 the second end is connected with earth terminal.
Controller 9 determines the target resistance of digital regulation resistance according to goal-setting voltage, can use formula 3：
Wherein, R2 is the target resistance of digital regulation resistance, and R1 is the resistance of first resistor, and U is goal-setting voltage, Uref
For the reference voltage of pwm circuit 5.
It is briefly described below：
By the control of pwm circuit 5, booster circuit enters the public affairs of stable state, first resistor R1 and digital regulation resistance R2
The reference voltage U of the magnitude of voltage held altogether and pwm circuit 5refIt is identical.Now the magnitude of voltage of the first end of energy storage inductor 3 is (namely
The goal-setting voltage U of booster circuit) meet formula 4：
U=(R1+R2)/R1 ★ Uref(formula 4)
In formula 2, first resistor R1 resistance, the reference voltage U of pwm circuit 5refWith the goal-setting of booster circuit
Voltage is all known quantity, so as to be assured that the target resistance of digital regulation resistance.
In addition, in present invention booster circuit disclosed above, second voltage sample circuit 8 can use as shown in Figure 4
Structure.Specifically：
Second voltage sample circuit 8 includes 3rd resistor R3 and the 4th resistance R4.Wherein, 3rd resistor R3 first end and
The second end connection of storage capacitor 3,3rd resistor R3 the second end are connected with the 4th resistance R4 first end, the 4th resistance R4's
Second end connects earth terminal.
The voltage sample port of controller 9 is connected with 3rd resistor R3 and the 4th resistance R4 common port, the basis of controller 9
The voltage at the 4th resistance R4 both ends determines the voltage at the second end of storage capacitor 3.Controller 9 is it is determined that the 4th resistance R4 both ends
After voltage, it is possible to it is determined that flowing through 3rd resistor R3 and the 4th resistance R4 electric current, be assured that storage capacitor 3 afterwards
The voltage at the second end.
It should be noted that controller 9 can use the chip with analog-digital conversion function, in this case, by this
The respective pin of chip is connected with 3rd resistor R3 and the 4th resistance R4 common port.
Certainly, controller 9 can also use other chips for not possessing analog-digital conversion function, in this case, control
Device 9 includes a chip and an analog-digital converter, and the input of the analog-digital converter is connected to 3rd resistor R3 and the 4th resistance R4
Common port, the output end of the analog-digital converter is connected to the respective pin of the chip.
Finally, it is to be noted that, herein, such as first and second or the like relational terms be used merely to by
One entity or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or operation
Between any this actual relation or order be present.Moreover, term " comprising ", "comprising" or its any other variant meaning
Covering including for nonexcludability, so that process, method, article or equipment including a series of elements not only include that
A little key elements, but also the other element including being not expressly set out, or also include for this process, method, article or
The intrinsic key element of equipment.In the absence of more restrictions, the key element limited by sentence "including a ...", is not arranged
Except other identical element in the process including the key element, method, article or equipment being also present.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.To the upper of the disclosed embodiments
State bright, professional and technical personnel in the field is realized or using the present invention.A variety of modifications to these embodiments are to ability
It will be apparent for the professional and technical personnel in domain, generic principles defined herein can not depart from the present invention's
In the case of spirit or scope, realize in other embodiments.Therefore, the present invention be not intended to be limited to it is shown in this article these
Embodiment, and it is to fit to the most wide scope consistent with principles disclosed herein and features of novelty.
Claims (6)
1. a kind of booster circuit, including energy storage inductor, current rectifying and wave filtering circuit, storage capacitor, power switch, pwm pulse width are adjusted
Circuit and current sampling circuit processed, it is characterised in that the booster circuit also includes first voltage sample circuit, second voltage is adopted
Sample circuit and controller；
The first voltage sample circuit includes first resistor and digital regulation resistance, the first resistor and the digital regulation resistance
It is connected to after series connection between first end and the earth terminal of the storage capacitor, the first resistor and the digital regulation resistance
Common port is connected with the voltage sample port of the pwm circuit, and the first end of the storage capacitor is the defeated of the booster circuit
Go out end；
The second voltage sample circuit is used to sample the output voltage of the booster circuit；
The controller is connected with the second voltage sample circuit and the digital regulation resistance respectively, and the controller is according to institute
The output voltage of the target output voltage and the booster circuit of stating booster circuit determines equivalent series electrical in the storage capacitor
Pressure drop caused by resistance, determines the current goal-setting voltage of the booster circuit afterwards, and the goal-setting voltage is the mesh
Output voltage and the pressure drop sum are marked, the target resistance of the digital regulation resistance is determined according to the goal-setting voltage, it
The resistance of the digital regulation resistance is adjusted to the target resistance afterwards.
2. booster circuit according to claim 1, it is characterised in that the first end of the first resistor and energy storage electricity
The first end connection of appearance, the second end of the first resistor are connected with the first end of the digital regulation resistance, the digital current potential
Second end of device is connected with earth terminal.
3. booster circuit according to claim 2, it is characterised in that the controller is true according to the goal-setting voltage
The target resistance of the fixed digital regulation resistance, it is：
According to formulaCalculate the target resistance of the digital regulation resistance；
Wherein, R2 is the target resistance of the digital regulation resistance, and R1 is the resistance of the first resistor, and U is the goal-setting
Voltage, UrefFor the reference voltage of the pwm circuit.
4. booster circuit according to claim 1, it is characterised in that the first end of the digital regulation resistance and the energy storage
The first end connection of electric capacity, the second end of the digital regulation resistance are connected with the first end of the first resistor, first electricity
Second end of resistance is connected with earth terminal.
5. booster circuit according to claim 4, it is characterised in that the controller is true according to the goal-setting voltage
The target resistance of the fixed digital regulation resistance, it is：
According to formulaCalculate the target resistance of the digital regulation resistance；
Wherein, R2 is the target resistance of the digital regulation resistance, and R1 is the resistance of the first resistor, and U is the goal-setting
Voltage, UrefFor the reference voltage of the pwm circuit.
6. booster circuit according to claim 1, it is characterised in that the second voltage sample circuit includes 3rd resistor
With the 4th resistance；
The first end of the 3rd resistor connects with the first end of the storage capacitor, the second end of the 3rd resistor with it is described
The first end connection of 4th resistance, the second end connection earth terminal of the 4th resistance；
The voltage sample port of the controller is connected with the common port of the 3rd resistor and the 4th resistance, the control
Device determines the voltage of the first end of the storage capacitor according to the voltage at the 4th resistance both ends.
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| CN201510228067.5A CN104868718B (en) | 2015-05-07 | 2015-05-07 | A kind of booster circuit |
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| CN202651863U (en) * | 2012-06-28 | 2013-01-02 | 华为终端有限公司 | Charger and charging system |
| CN102931838A (en) * | 2012-11-15 | 2013-02-13 | 常州大学 | Slope compensation method for voltage-type hysteresis loop control switching converter and device thereof |
| CN103078498A (en) * | 2012-12-27 | 2013-05-01 | 华为技术有限公司 | Voltage conversion circuit and use method thereof |
| CN104348238A (en) * | 2014-11-13 | 2015-02-11 | 惠州Tcl移动通信有限公司 | Charging voltage control device, mobile terminal and control method |
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