CN104868718A - Voltage boosting circuit - Google Patents
Voltage boosting circuit Download PDFInfo
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- CN104868718A CN104868718A CN201510228067.5A CN201510228067A CN104868718A CN 104868718 A CN104868718 A CN 104868718A CN 201510228067 A CN201510228067 A CN 201510228067A CN 104868718 A CN104868718 A CN 104868718A
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a voltage boosting circuit. A first voltage sampling circuit connected with a PWM circuit is composed of a first resistor and a digital potentiometer which are connected in series; a second voltage sampling circuit and a controller are arranged in the voltage boosting circuit; in the operating process of the voltage boosting circuit, the controller determines the voltage value of the second end of an energy storage capacitor according to the output of the second voltage sampling circuit, and determines voltage drop generated by the energy storage capacitor according to the target output voltage of the voltage boosting circuit, and then, the controller determines the target set voltage of the voltage boosting circuit according to the voltage drop and the target output voltage of the voltage boosting circuit; and the resistance value of the digital potentiometer can be adjusted through utilizing the target set voltage, so that the voltage of the first end of the energy storage capacitor can achieve the target set voltage, and therefore, the output voltage of the voltage boosting circuit can achieve the target output voltage, and the voltage boosting ability of the boosting circuit can still keep stable in low temperature environment. With the voltage boosting circuit of the invention adopted, stepless adjustment of the output voltage can be realized.
Description
Technical field
The invention belongs to power supply technique field, particularly relate to a kind of booster circuit.
Background technology
Need to use booster circuit in the engine of motor vehicle, the output accuracy of booster circuit is directly connected to the runnability of engine.Such as, will arrange booster circuit in the fuel injector of engine, the output accuracy of this booster circuit directly affects the opening speed of fuel injector magnetic system, thus affects the control precision of fuel injector.
Fig. 1 is a kind of structural representation of existing booster circuit, and this booster circuit comprises energy storage inductor 01, current 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 as booster circuit input, be connected with one end of power supply 08, second end of energy storage inductor 01 is connected with the first end of storage capacitor 03 by current rectifying and wave filtering circuit 02, and the second end of storage capacitor 03 is as the output of booster circuit.The input of power switch 04 is connected with the second end of energy storage inductor 01, and the output of power switch 04 is connected with the other end of power supply 08 by current sampling circuit 06, and the control end of power switch 04 is connected with pwm circuit 05.The output of current sampling circuit 06 is connected with the current sample port of pwm circuit 05, the output of voltage feedback circuit 07 is connected with the voltage sample port of pwm circuit 05, pwm circuit 05 controls power switch 04 periodically turn-on and turn-off according to the output of current sampling circuit 06 and voltage feedback circuit 07, thus makes booster circuit export the electric energy presetting voltage.
But existing booster circuit existing defects: when the temperature of the surroundings is low, the boost capability of booster circuit declines, and causes the voltage of the electric energy exported cannot reach the magnitude of voltage preset.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of booster circuit, its boost capability keeps stable when ambient temperature is lower, and the magnitude of voltage of its electric energy exported can reach the magnitude of voltage preset.
For achieving the above object, the invention provides following technical scheme:
A kind of booster circuit, comprises energy storage inductor, current rectifying and wave filtering circuit, storage capacitor, power switch, pwm pulse width modulation circuit, current sampling circuit, the first voltage sampling circuit, the second voltage sampling circuit and controller;
Described first voltage sampling circuit comprises the first resistance and digital regulation resistance, between the first end that described first resistance and described digital regulation resistance are connected to described storage capacitor after connecting and earth terminal, described first resistance is connected with the voltage sample port of described pwm circuit with the common port of described digital regulation resistance, and the second end of described storage capacitor is the output of described booster circuit;
Described second voltage sampling circuit is used for sampling to the magnitude of voltage of the second end of described storage capacitor;
Described controller is connected with described second voltage sampling circuit and described digital regulation resistance respectively, described controller determines according to the voltage of the second end of the target output voltage of described booster circuit and described storage capacitor the pressure drop that described storage capacitor produces, determine the goal-setting voltage that described booster circuit is current afterwards, described goal-setting voltage is described target output voltage and described pressure drop sum, determine the target resistance of described digital regulation resistance according to described goal-setting voltage, afterwards the resistance of described digital regulation resistance is adjusted to described target resistance.
Preferably, in above-mentioned booster circuit, the first end of described first resistance is connected with the first end of described storage capacitor, and the second end of described first resistance is connected with the first end of described digital regulation resistance, and the second end of described digital regulation resistance is connected with earth terminal.
Preferably, in above-mentioned booster circuit, described controller determines the target resistance of described digital regulation resistance according to described goal-setting voltage, for:
According to formula
calculate the target resistance of described digital regulation resistance;
Wherein, R2 is the target resistance of described digital regulation resistance, and R1 is the resistance of described first resistance, and U is described goal-setting voltage, U
reffor the reference voltage of described pwm circuit.
Preferably, in above-mentioned booster circuit, the first end of described digital regulation resistance is connected with the first end of described storage capacitor, and the second end of described digital regulation resistance is connected with the first end of described first resistance, and the second end of described first resistance is connected with earth terminal.
Preferably, in above-mentioned booster circuit, described controller determines the target resistance of described digital regulation resistance according to described goal-setting voltage, for:
According to formula
calculate the target resistance of described digital regulation resistance;
Wherein, R2 is the target resistance of described digital regulation resistance, and R1 is the resistance of described first resistance, and U is described goal-setting voltage, U
reffor the reference voltage of described pwm circuit.
Preferably, in above-mentioned booster circuit, described second voltage sampling circuit comprises the 3rd resistance and the 4th resistance;
The described first end of the 3rd resistance is connected with the second end of described storage capacitor, and the second end of described 3rd resistance is connected with the first end of described 4th resistance, and the second end of described 4th resistance connects earth terminal;
The voltage sample port of described controller is connected with the common port of described 3rd resistance and described 4th resistance, and described controller determines the voltage of the second end of described storage capacitor according to the voltage at described 4th resistance two ends.
As can be seen here, beneficial effect of the present invention is: in booster circuit disclosed by the invention, the first voltage sampling circuit be connected with pwm circuit is made up of first resistance of connecting and digital regulation resistance, and be also provided with the second voltage sampling circuit and controller in this booster circuit, in booster circuit running, the magnitude of voltage of the second end of storage capacitor determined by controller according to the output of the second voltage sampling circuit, and according to the pressure drop that the target output voltage determination storage capacitor of booster circuit produces, controller is according to the goal-setting voltage of the target output voltage determination booster circuit of this pressure drop and booster circuit afterwards, and utilize the resistance of this goal-setting Voltage Cortrol digital regulation resistance, make the voltage of the first end of storage capacitor can reach this goal-setting voltage, thus make the output voltage of booster circuit to reach target output voltage, ensure that the boost capability of booster circuit still can keep stable at low ambient temperatures.In addition, booster circuit disclosed by the invention, can adjust output voltage by the resistance adjusting digital regulation resistance, achieve the stepless changing of output voltage.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 is a kind of structural representation of existing booster circuit;
Fig. 2 is the structural representation of a kind of booster circuit disclosed by the invention;
Fig. 3 is the structural representation of another kind of booster circuit disclosed by the invention;
Fig. 4 is the structural representation of another kind of booster circuit disclosed by the invention.
Embodiment
Applicant finds: by the restriction of manufacturing process and material, and capacitor equivalent is electric capacity and the resistance of series connection, and this resistance can regard the equivalent series resistance of electric capacity as.Along with the reduction of temperature, the resistance of this equivalent series resistance can corresponding increase, and at low ambient temperatures, this equivalent series resistance can reach several ohm, produce a larger pressure drop at electric capacity two ends, this just causes the output voltage of booster circuit lower than the target output voltage of setting.The target output voltage of booster circuit refers to: the desired output voltage of the booster circuit set by system.
The present invention discloses a kind of booster circuit, and the boost capability of this booster circuit keeps stable when ambient temperature is lower, the magnitude of voltage of its electric energy exported can reach the magnitude of voltage preset.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
See the structural representation that Fig. 2, Fig. 2 are a kind of booster circuit disclosed by the invention.This booster circuit comprises energy storage inductor 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 sampling circuit 8 and controller 9.
Wherein:
The first end of energy storage inductor 1 as booster circuit input, be connected with one end of power supply 10, the second end of energy storage inductor 1 is connected with the first end of storage capacitor 3 by current rectifying and wave filtering circuit 2, and the second end of storage capacitor 3 is as the output of booster circuit.
The input of power switch 4 is connected with the second end of energy storage inductor 1, and the output of power switch 4 is connected with the other end of power supply 10 by current sampling circuit 6, and the control end of power switch 4 is connected with pwm circuit 5.The output of current sampling circuit 6 is connected with the current sample port of pwm circuit 5.
First voltage sampling circuit 7 comprises the first resistance R1 and digital regulation resistance R2.Concrete, between the first end that first resistance R1 and digital regulation resistance R2 is connected to storage capacitor 3 after connecting and earth terminal, first resistance R1 is connected with the voltage sample port of pwm circuit 5 with the common port of digital regulation resistance R2, and the second end of storage capacitor 2 is the output of booster circuit.
In booster circuit shown in Fig. 1, the first end of the first resistance R1 is connected with the first end of storage capacitor 3, and second end of the first resistance R1 is connected with the first end of digital regulation resistance R2, and second end of digital regulation resistance R2 is connected with earth terminal.
The voltage sample port of pwm circuit 5 is connected with the common port of the first resistance R1 and digital regulation resistance R2, the current sample port of pwm circuit 5 is connected with the output of current sampling circuit 6, and pwm circuit 5 controls power switch 4 periodically turn-on and turn-off according to the output of the first voltage sampling circuit 7 and current sampling circuit 6.
After pwm circuit 5 controls power switch 4 conducting, electric current forms loop through power supply 10-energy storage inductor 1-power switch 4-current sampling circuit 6-power supply 10, energy storage inductor 1 starts energy storage, in the process, current sampling circuit 6 detects the energy in inductive energy storage loop, after the energy in inductive energy storage loop reaches predetermined value, pwm circuit 5 controls power switch 4 and turns off, and completes the thermal energy storage process of energy storage inductor 1.After pwm circuit 5 controls power switch 4 shutoff, energy storage inductor 1 is charged for storage capacitor 3 by current rectifying and wave filtering circuit 2.After energy storage inductor 1 electric discharge terminates, pwm circuit 5 controls power switch conducting, starts next charge and discharge cycles.Storage capacitor 3 exports to corresponding load as power supply.
Second voltage sampling circuit 8 is sampled for the magnitude of voltage of the second end to storage capacitor 3, namely samples to the output voltage of booster circuit.
Controller 9 is connected with the second voltage sampling circuit 8 and digital regulation resistance R2 respectively.The pressure drop that controller 9 produces according to the voltage determination storage capacitor 3 of the second end of the target output voltage of booster circuit and storage capacitor 3, determines the goal-setting voltage that booster circuit is current afterwards.Wherein, goal-setting voltage be target output voltage and this pressure drop and.Afterwards, the resistance of digital regulation resistance R2, according to the target resistance of goal-setting voltage determination digital regulation resistance R2, is adjusted to this target resistance by controller 9 afterwards.
Controller 9 is connected with the second voltage sampling circuit 8, can determine the magnitude of voltage of the second end of storage capacitor 3 according to the output of the second voltage sampling circuit 8.Controller 9 is according to the voltage of the second end of the target output voltage of booster circuit and storage capacitor 3, just can determine the pressure drop that storage capacitor 3 produces under current environment, the controller 9 goal-setting voltage that utilizes the target output voltage determination booster circuit of this pressure drop and booster circuit current afterwards, utilize the resistance of this goal-setting Voltage Cortrol digital regulation resistance R2, make the voltage of the first end of storage capacitor 3 can reach this goal-setting voltage, thus make the output voltage of booster circuit to reach target output voltage.
In booster circuit disclosed by the invention, the first voltage sampling circuit be connected with pwm circuit is made up of first resistance of connecting and digital regulation resistance, and be also provided with the second voltage sampling circuit and controller in this booster circuit, in booster circuit running, the magnitude of voltage of the second end of storage capacitor determined by controller according to the output of the second voltage sampling circuit, and according to the pressure drop that the target output voltage determination storage capacitor of booster circuit produces, controller is according to the goal-setting voltage of the target output voltage determination booster circuit of this pressure drop and booster circuit afterwards, and utilize the resistance of this goal-setting Voltage Cortrol digital regulation resistance, make the voltage of the first end of storage capacitor can reach this goal-setting voltage, thus make the output voltage of booster circuit to reach target output voltage, ensure that the boost capability of booster circuit still can keep stable at low ambient temperatures.In addition, booster circuit disclosed by the invention, can adjust output voltage by the resistance adjusting digital regulation resistance, achieve the stepless changing of output voltage.
When the first voltage sampling circuit 7 adopts structure shown in Fig. 2, controller 9, according to the target resistance of goal-setting voltage determination digital regulation resistance, can adopt formula 1:
Wherein, R2 is the target resistance of digital regulation resistance, and R1 is the resistance of the first resistance, and U is goal-setting voltage, U
reffor the reference voltage of pwm circuit 5.
Carry out brief description below:
Through the control of pwm circuit 5, booster circuit enters stable state, the magnitude of voltage of the common port of the first resistance R1 and digital regulation resistance R2 and the reference voltage U of pwm circuit 5
refidentical.Now the magnitude of voltage (namely the goal-setting voltage U of booster circuit) of the first end of energy storage inductor 3 meets formula 2:
U=(R1+R2)/R2
★u
ref(formula 2)
In formula 2, the resistance of the first resistance R1, the reference voltage U of pwm circuit 5
refbe all known quantity with the goal-setting voltage of booster circuit, thus just can determine the target resistance of digital regulation resistance.
In addition, the first voltage sampling circuit 7 can also adopt the structure shown in Fig. 3.
See the structural representation that Fig. 3, Fig. 3 are another kind of booster circuit disclosed by the invention.This booster circuit comprises energy storage inductor 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 sampling circuit 8 and controller 9.Here be described the first voltage sampling circuit 7 emphatically, other parts refer to and describe above.
First voltage sampling circuit 7 comprises the first resistance R1 and digital regulation resistance R2.Concrete, the first end of digital regulation resistance R2 is connected with the first end of storage capacitor 3, and the second end of digital regulation resistance is connected with the first end of the first resistance R1, and second end of the first resistance R1 is connected with earth terminal.
Controller 9, according to the target resistance of goal-setting voltage determination digital regulation resistance, can adopt formula 3:
(formula 3)
Wherein, R2 is the target resistance of digital regulation resistance, and R1 is the resistance of the first resistance, and U is goal-setting voltage, U
reffor the reference voltage of pwm circuit 5.
Carry out brief description below:
Through the control of pwm circuit 5, booster circuit enters stable state, the magnitude of voltage of the common port of the first resistance R1 and digital regulation resistance R2 and the reference voltage U of pwm circuit 5
refidentical.Now the magnitude of voltage (namely the goal-setting voltage U of booster circuit) of the first end of energy storage inductor 3 meets formula 4:
U=(R1+R2)/R1
★u
ref(formula 4)
In formula 2, the resistance of the first resistance R1, the reference voltage U of pwm circuit 5
refbe all known quantity with the goal-setting voltage of booster circuit, thus just can determine the target resistance of digital regulation resistance.
In addition, state in disclosed booster circuit on the invention, the second voltage sampling circuit 8 can adopt structure as shown in Figure 4.Concrete:
Second voltage sampling circuit 8 comprises the 3rd resistance R3 and the 4th resistance R4.Wherein, the first end of the 3rd resistance R3 is connected with the second end of storage capacitor 3, and second end of the 3rd resistance R3 is connected with the first end of the 4th resistance R4, and second end of the 4th resistance R4 connects earth terminal.
The voltage sample port of controller 9 is connected with the common port of the 3rd resistance R3 and the 4th resistance R4, and controller 9 is according to the voltage of the second end of the voltage determination storage capacitor 3 at the 4th resistance R4 two ends.Controller 9, after the voltage determining the 4th resistance R4 two ends, just can be determined the electric current flowing through the 3rd resistance R3 and the 4th resistance R4, just can determine the voltage of the second end of storage capacitor 3 afterwards.
It should be noted that, controller 9 can adopt the chip with analog-digital conversion function, in this case, is connected by the common port of the respective pin of this chip with the 3rd resistance R3 and the 4th resistance R4.
Certainly, controller 9 also can adopt other chips not possessing analog-digital conversion function, in this case, controller 9 comprises a chip and an analog to digital converter, the input of this analog to digital converter is connected to the common port of the 3rd resistance R3 and the 4th resistance R4, and the output of this analog to digital converter is connected to the respective pin of this chip.
Finally, also it should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (6)
1. a booster circuit, comprise energy storage inductor, current rectifying and wave filtering circuit, storage capacitor, power switch, pwm pulse width modulation circuit and current sampling circuit, it is characterized in that, described booster circuit also comprises the first voltage sampling circuit, the second voltage sampling circuit and controller;
Described first voltage sampling circuit comprises the first resistance and digital regulation resistance, between the first end that described first resistance and described digital regulation resistance are connected to described storage capacitor after connecting and earth terminal, described first resistance is connected with the voltage sample port of described pwm circuit with the common port of described digital regulation resistance, and the second end of described storage capacitor is the output of described booster circuit;
Described second voltage sampling circuit is used for sampling to the magnitude of voltage of the second end of described storage capacitor;
Described controller is connected with described second voltage sampling circuit and described digital regulation resistance respectively, described controller determines according to the voltage of the second end of the target output voltage of described booster circuit and described storage capacitor the pressure drop that described storage capacitor produces, determine the goal-setting voltage that described booster circuit is current afterwards, described goal-setting voltage is described target output voltage and described pressure drop sum, determine the target resistance of described digital regulation resistance according to described goal-setting voltage, afterwards the resistance of described digital regulation resistance is adjusted to described target resistance.
2. booster circuit according to claim 1, it is characterized in that, the first end of described first resistance is connected with the first end of described storage capacitor, and the second end of described first resistance is connected with the first end of described digital regulation resistance, and the second end of described digital regulation resistance is connected with earth terminal.
3. booster circuit according to claim 2, is characterized in that, described controller determines the target resistance of described digital regulation resistance according to described goal-setting voltage, for:
According to formula
calculate the target resistance of described digital regulation resistance;
Wherein, R2 is the target resistance of described digital regulation resistance, and R1 is the resistance of described first resistance, and U is described goal-setting voltage, U
reffor the reference voltage of described pwm circuit.
4. booster circuit according to claim 1, it is characterized in that, the first end of described digital regulation resistance is connected with the first end of described storage capacitor, and the second end of described digital regulation resistance is connected with the first end of described first resistance, and the second end of described first resistance is connected with earth terminal.
5. booster circuit according to claim 4, is characterized in that, described controller determines the target resistance of described digital regulation resistance according to described goal-setting voltage, for:
According to formula
calculate the target resistance of described digital regulation resistance;
Wherein, R2 is the target resistance of described digital regulation resistance, and R1 is the resistance of described first resistance, and U is described goal-setting voltage, U
reffor the reference voltage of described pwm circuit.
6. booster circuit according to claim 1, is characterized in that, described second voltage sampling circuit comprises the 3rd resistance and the 4th resistance;
The described first end of the 3rd resistance is connected with the second end of described storage capacitor, and the second end of described 3rd resistance is connected with the first end of described 4th resistance, and the second end of described 4th resistance connects earth terminal;
The voltage sample port of described controller is connected with the common port of described 3rd resistance and described 4th resistance, and described controller determines the voltage of the second end of described storage capacitor according to the voltage at described 4th resistance two ends.
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| CN110525244A (en) * | 2019-09-09 | 2019-12-03 | 中兴新能源汽车有限责任公司 | Inhibiting voltage oscillation adjusts circuit and wireless charging system |
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| CN104868718B (en) | 2017-11-10 |
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