CN113922661A - BOOST booster circuit and control method thereof - Google Patents
BOOST booster circuit and control method thereof Download PDFInfo
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- CN113922661A CN113922661A CN202111158062.1A CN202111158062A CN113922661A CN 113922661 A CN113922661 A CN 113922661A CN 202111158062 A CN202111158062 A CN 202111158062A CN 113922661 A CN113922661 A CN 113922661A
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
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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
Abstract
The application discloses a BOOST circuit and a control method thereof, and relates to the technical field of switching direct current BOOST circuits, wherein the BOOST circuit comprises an energy storage inductor L, a diode D1, an energy storage capacitor branch circuit, a resistor R1, a resistor R2, a control chip U and a field effect transistor Q; one end of the energy storage inductor L is connected with the anode of the diode D1, the other end of the energy storage inductor L is used for receiving an input voltage Vin, the cathode of the diode D1 is used for outputting a boosted output voltage Vout and is connected with one end of the energy storage capacitor branch circuit, and the other end of the energy storage capacitor branch circuit is grounded; the first end of the resistor R1 is connected with the cathode of the diode D1, and the second end is connected with the resistor R2 in series and then grounded; the voltage feedback end of the control chip U is connected with the second end of the resistor R1, and the driving end of the control chip U is connected with the anode of the diode D1 through the field effect transistor Q; the control chip U is configured to adjust the duty ratio according to the feedback voltage obtained from the voltage feedback terminal so that the output voltage Vout is regulated by the switching of the field effect transistor Q to fluctuate. The output stability of the booster circuit can be improved.
Description
Technical Field
The application relates to the technical field of switch direct current BOOST circuits, in particular to a BOOST circuit and a control method thereof.
Background
With the gradual development of green economy, the development of electric automobiles is also gradually rapid. As an important component of an electric vehicle, a motor controller is an indispensable part for driving the vehicle, and in order to improve the stability of the motor controller, the motor controller is required to be able to operate stably even with a wide low-voltage power supply input.
However, the conventional boost circuit has a disadvantage of poor operation stability under a wide range of input voltages, which is also to be solved.
Disclosure of Invention
The embodiment of the application provides a BOOST circuit and a control method thereof, which aim to solve the technical problem that the traditional BOOST circuit in the related art has poor working stability under wide-range input voltage.
In a first aspect, an embodiment of the present application provides a BOOST circuit, including an energy storage inductor L, a diode D1, an energy storage capacitor branch, a resistor R1, a resistor R2, a control chip U, and a field effect transistor Q;
one end of the energy storage inductor L is connected to the anode of the diode D1, the other end of the energy storage inductor L is configured to receive an input voltage Vin, the cathode of the diode D1 is configured to output a boosted output voltage Vout and is connected to one end of the energy storage capacitor branch, and the other end of the energy storage capacitor branch is grounded;
the first end of the resistor R1 is connected with the cathode of the diode D1, and the second end of the resistor R1 is connected with the ground after being connected with the resistor R2 in series;
a voltage feedback end of the control chip U is connected with a second end of the resistor R1, and a driving end of the control chip U is connected with an anode of the diode D1 through the field effect transistor Q;
meanwhile, the control chip U is configured to adjust the duty ratio according to the feedback voltage obtained from the voltage feedback terminal, so that the fluctuation of the output voltage Vout is regulated by the switching of the field effect transistor Q.
In some embodiments, the control chip U is further configured to:
comparing the obtained feedback voltage with a set voltage threshold;
if the feedback voltage is below the voltage threshold, adjusting and outputting a duty ratio for controlling a Q switch of the field effect transistor, so that the output voltage Vout is kept stable;
and if the feedback voltage exceeds the voltage threshold, triggering the field effect transistor Q to cut off.
In some embodiments, the source of the fet Q is connected in series with a resistor R6 and then grounded, and the current feedback terminal of the control chip U is connected to the source of the fet Q through an RC filter branch.
In some embodiments, the RC filter circuit includes a resistor R4 and a capacitor C4,
one end of the resistor R4 is connected with the source electrode of the field effect transistor Q, the other end is connected with the current feedback end of the control chip U,
one end of the capacitor C4 is connected with the current feedback end, and the other end is connected with the analog ground end of the control chip U.
In some embodiments, the control chip U is further configured to:
if the voltage of the resistor R4 exceeds a set voltage limit, the comparator controls the switching frequency of the field effect transistor Q to be reduced.
In some embodiments, the gate of the fet Q is connected to the driving terminal through a resistor R5, and/or the drain of the fet Q is directly connected to the anode of the diode D1.
In some embodiments, the energy storage capacitor branch comprises two capacitors, the two capacitors are connected in parallel, one end of each capacitor is connected with the first end, and the other end of each capacitor is grounded.
In some embodiments, further comprising:
the first filtering branch circuit comprises a capacitor C5 and a diode D2, the capacitor C5, the diode D2 and the energy storage inductor L are sequentially connected in series end to end, the anode of the diode D2 is grounded, and the cathode of the diode D2 is also connected with the anode of the diode D1; and/or
And the second filtering branch circuit comprises a resistor R3 and a capacitor C3, one end of the resistor R3 is connected with a forward voltage Vcc, the other end of the resistor R3 and one end of the capacitor C3 are both connected with the power supply end, and the other end of the capacitor C3 is grounded.
In a second aspect, an embodiment of the present application further provides a method for controlling a BOOST circuit as described above, including the following steps:
and adjusting the duty ratio according to the feedback voltage acquired from the voltage feedback end, so that the fluctuation of the output voltage Vout is adjusted through the switch of the field effect transistor Q.
In some embodiments, the method specifically comprises the following steps:
comparing the feedback voltage obtained from the voltage feedback end with a set voltage threshold;
if the feedback voltage is below the voltage threshold, adjusting and outputting a duty ratio for controlling a Q switch of the field effect transistor, so that the output voltage Vout is kept stable;
and if the feedback voltage exceeds the voltage threshold, triggering the field effect transistor Q to cut off.
The beneficial effect that technical scheme that this application provided brought includes: the output stability of the booster circuit is improved.
The embodiment of the application provides a BOOST circuit, which comprises an energy storage inductor L, a diode D1, an energy storage capacitor branch, a resistor R1, a resistor R2, a control chip U and a field effect transistor Q; the anode of the diode D1 is connected with an energy storage inductor L and a field effect transistor Q, the cathode is connected with an energy storage capacitor branch, the other end of the energy storage inductor L receives an input voltage Vin, one end of the energy storage capacitor branch, which is far away from the ground, provides an output voltage Vout, if the field effect transistor Q is conducted, the energy storage inductor L is charged and the energy storage capacitor branch is discharged, if the field effect transistor Q is cut off, the energy storage inductor L is discharged and the energy storage capacitor branch is charged, and the fluctuation range of the output voltage Vout provided by the BOOST booster circuit is adjustable through the control of charging and discharging; meanwhile, the field effect transistor Q is controlled by the control chip, the first end of the resistor R1 is connected to the cathode of the diode D1, the second end is connected to the voltage feedback end of the control chip U, and the second end is also connected to the ground after being connected to the resistor R2 in series, considering that the resistor R1 and the resistor R2 form a voltage dividing branch, and when the output voltage Vout fluctuates, the feedback voltage at the second end also fluctuates correspondingly, so the control chip U adjusts the duty ratio according to the feedback voltage obtained from the voltage feedback end, and the duty ratio can be used for the field effect transistor Q to be turned on or off to further adjust the fluctuation of the output voltage Vout, and if the adjusted duty ratio makes the fluctuation tend to zero, that is, the output voltage Vout provided by the BOOST circuit maintains stable output.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a BOOST voltage BOOST circuit according to an embodiment of the present disclosure.
The implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The flow diagrams depicted in the figures are merely illustrative and do not necessarily include all of the elements and operations/steps, nor do they necessarily have to be performed in the order depicted. For example, some operations/steps may be decomposed, combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.
The embodiment of the application provides a BOOST circuit, which can solve the technical problem that the traditional BOOST circuit in the related art has poor working stability under wide-range input voltage.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Referring to fig. 1, an embodiment of the present application provides a BOOST circuit, which includes an energy storage inductor L, a diode D1, an energy storage capacitor branch, a resistor R1, a resistor R2, a control chip U, and a field effect transistor Q;
one end of the energy storage inductor L is connected to the anode of the diode D1, the other end of the energy storage inductor L is configured to receive an input voltage Vin, the cathode of the diode D1 is configured to output a boosted output voltage Vout and is connected to one end of the energy storage capacitor branch, and the other end of the energy storage capacitor branch is grounded;
the first end of the resistor R1 is connected with the cathode of the diode D1, and the second end of the resistor R1 is connected with the ground after being connected with the resistor R2 in series;
a voltage feedback end of the control chip U is connected with a second end of the resistor R1, and a driving end of the control chip U is connected with an anode of the diode D1 through the field effect transistor Q;
meanwhile, the control chip U is configured to adjust the duty ratio according to the feedback voltage obtained from the voltage feedback terminal, so that the fluctuation of the output voltage Vout is regulated by the switching of the field effect transistor Q.
In the embodiment of the present application, as shown in fig. 1, the BOOST circuit includes an energy storage inductor L, a diode D1, an energy storage capacitor branch, a resistor R1, a resistor R2, a control chip U, and a field effect transistor Q, where one end of the energy storage inductor L receives an input voltage Vin, the other end of the energy storage inductor L is connected to an anode of the diode D1, a cathode of the diode D1 is connected to one end of the energy storage capacitor branch, which is far away from the ground, and is configured to provide an output voltage Vout to a load; and a first end of the resistor R1 is connected with a cathode of the diode D1, a second end A is connected with the resistor R2 in series and then grounded, a driving end of the control chip U is connected with an anode of the diode D1 through the field effect transistor Q, and a voltage feedback end of the control chip U is connected with the second end A.
If the control chip U controls the field effect transistor Q to be conducted, current flows to the ground through the energy storage inductor L and the field effect transistor Q, the energy storage inductor L is charged, at the moment, the diode D1 is reversely biased to be cut off, the energy storage circuit discharges, and power is supplied to the load; if the control chip U controls the field effect transistor Q to be cut off, the back electromotive force of the energy storage inductor L causes the current on the field effect transistor Q not to suddenly change instantaneously, and then the current is discharged gradually, at the moment, the diode D1 is conducted in a forward bias mode, the input voltage Vin and the voltage of the energy storage inductor L are superposed to charge the energy storage capacitor branch circuit through the diode D1, and power is supplied to the load.
It can be seen that the control chip U triggers the on and off of the field effect transistor Q to further control the charging and discharging of the energy storage capacitor branch, the charging and discharging control enables the fluctuation range of the output voltage Vout provided by the BOOST voltage BOOST circuit to be adjustable, and when the fluctuation approaches zero, the output voltage Vout provided by the BOOST voltage BOOST circuit can be considered to be maintained at stable output.
It should be noted that the field effect transistor Q is controlled by the control chip U, the first end of the resistor R1 is connected to the cathode of the diode D1, the second end is connected to the voltage feedback end of the control chip U, and the second end is further connected to the resistor R2 in series and then grounded, considering that the resistor R1 and the resistor R2 form a voltage dividing branch, and when the output voltage Vout fluctuates, the feedback voltage VFB at the second end also fluctuates correspondingly, so that the control chip U adjusts the duty ratio according to the feedback voltage VFB obtained from the voltage feedback end, and the duty ratio can be used for turning on or off the field effect transistor Q to further adjust the fluctuation of the output voltage Vout, and if the adjusted duty ratio makes the fluctuation tend to zero, it is considered that the output voltage Vout of the BOOST circuit in the current environment is maintained at a stable output.
As a preferred embodiment of the present application, the control chip U is further configured to:
comparing the obtained feedback voltage with a set voltage threshold;
if the feedback voltage is below the voltage threshold, adjusting and outputting a duty ratio for controlling a Q switch of the field effect transistor, so that the output voltage Vout is kept stable;
and if the feedback voltage exceeds the voltage threshold, triggering the field effect transistor Q to cut off.
In the embodiment of the present application, if the output voltage Vout is stable, the feedback voltage VFB between the voltage R1 and the resistor R2 should also be stable; the feedback voltage which should be stable is the set voltage threshold or is slightly lower than the set voltage threshold, and the specific value of the voltage threshold is determined according to experience or precision requirements; meanwhile, the mathematical relationship between the voltage V1 of the feedback voltage VFB and the voltage V2 of the output voltage Vout is related to the resistance values of the voltage R1 and the resistor R2, that is, V2 is V1 · (R1+ R2)/R2, so that the control chip U can determine whether the output voltage Vout is stable according to the obtained feedback voltage VFB, and the magnitude of the output voltage Vout can also be determined by the duty cycle of triggering the on and off of the fet Q, and therefore when the voltage value of the feedback voltage VFB is below the voltage threshold, the duty cycle of controlling the on and off of the fet Q is adjusted and output, so that the output voltage Vout can be kept stable.
When the voltage value of the feedback voltage VFB exceeds the voltage threshold value, the current on the BOOST circuit is over-current, the control chip U controls the field-effect tube Q to be cut off to protect the BOOST circuit, the field-effect tube Q is cut off to reduce the output voltage Vout, and after the voltage value of the feedback voltage VFB is reduced to be lower than the voltage threshold value, the control chip U continues to output the duty ratio to control the normal conduction and cut-off of the field-effect tube Q, so that the overvoltage protection of the BOOST circuit is realized.
Furthermore, the source electrode of the field effect transistor Q is connected in series with a resistor R6 and then grounded, and the current feedback end of the control chip U is connected with the source electrode of the field effect transistor Q through an RC filter branch.
In this embodiment, the source of the fet Q is connected in series with a resistor R6 and then grounded, so that a current passes through a node between the fet Q and the resistor R6, which can detect the feedback current ISEN at the node, and detect the feedback current ISEN at the source of the fet Q in real time to protect the fet Q from being damaged by a large current.
Furthermore, the RC filter circuit comprises a resistor R4 and a capacitor C4,
one end of the resistor R4 is connected with the source electrode of the field effect transistor Q, the other end is connected with the current feedback end of the control chip U,
one end of the capacitor C4 is connected with the current feedback end, and the other end is connected with the analog ground end of the control chip U.
Still further, the control chip U is further configured to:
if the voltage of the resistor R4 exceeds a set voltage limit, the comparator controls the switching frequency of the field effect transistor Q to be reduced.
In the embodiment of the application, when the current on the resistor R4 is overcurrent, short-circuit current-limiting protection is started. Since the voltage across the resistor R4 is detected, the current value of the feedback current ISEN can be determined, and the current of the resistor R4 is over-current, i.e., the voltage of the resistor R4 exceeds the set voltage limit 343 mV. After determining that the BOOST circuit is over-current, a comparator in the control chip U reduces the switching frequency by five times until the state is finished, so that the over-current protection of the BOOST circuit is realized.
Specifically, the gate of the fet Q is connected to the driving terminal through a resistor R5, and/or the drain of the fet Q is directly connected to the anode of the diode D1.
Further, the energy storage capacitor branch comprises two capacitors which are connected in parallel, one end of each capacitor is connected with the first end, and the other end of each capacitor is grounded.
In this embodiment, one of the two capacitors is a capacitor C1, and the other is a capacitor C2, if the fet Q is turned on, the energy storage inductor L discharges, and at this time, the capacitor C1 and the capacitor C2 are charged by the forward biased diode D1; if the field effect transistor Q is turned off, the energy storage inductor L is charged, and at this time, the diode D1 is reversely biased, and the capacitor C1 and the capacitor C2 discharge and supply power to the load, thereby maintaining the stability of the output voltage Vout.
Specifically, one end of the capacitor C1, which is far from the ground end, is further connected in series with a resistor R5 to supply power to the load.
Further, still include:
the first filtering branch circuit comprises a capacitor C5 and a diode D2, the capacitor C5, the diode D2 and the energy storage inductor L are sequentially connected in series end to end, the anode of the diode D2 is grounded, and the cathode of the diode D2 is also connected with the anode of the diode D1; and/or
And the second filtering branch circuit comprises a resistor R3 and a capacitor C3, one end of the resistor R3 is connected with a forward voltage Vcc, the other end of the resistor R3 and one end of the capacitor C3 are both connected with the power supply end, and the other end of the capacitor C3 is grounded.
In the embodiment of the present application, if the energy storage inductor L is discharged, the diode D2 is reverse biased, and the input voltage Vin charges the capacitor C5. The forward voltage Vcc enters the control chip U after being filtered and stabilized by the second filtering branch circuit to be used by the control chip U, so that the control chip U is ensured to generate a stable driving waveform during working, and the field effect transistor is ensured to be normally controlled to be switched on and switched off so as to maintain the stability and reliability of the output voltage.
Furthermore, the forward voltage Vcc and the input voltage Vin can be divided into two paths of voltages by a 5V input power supply, so that the normal power supply of the control chip U can be ensured by the input power supply while the input power supply is boosted, an additional power supply of the control chip U is not needed, and the cost is saved.
As shown in fig. 1, the control chip U includes pins 1 to 8, where pin 1 is a power end, pin 2 is a frequency adjustment end, pin 3 is a driving end, pin 4 is a power ground end, pin 5 is a current feedback end, pin 6 is a control compensation end, pin 7 is a voltage feedback end, pin 8 is an analog ground end, and the power ground end and the analog ground end are both grounded. Specifically, the frequency adjusting end of the driving chip U is connected in series with a resistor R8 and then grounded, and the control compensation end is connected in series with a capacitor C6 and a resistor R9 in sequence and then grounded.
The embodiment of the application also provides a control method of the BOOST circuit, which comprises the following steps:
and adjusting the duty ratio according to the feedback voltage acquired from the voltage feedback end, so that the fluctuation of the output voltage Vout is adjusted through the switch of the field effect transistor Q.
In the embodiment of the application, the control chip U triggers the on and off of the field effect transistor Q to further control the charging and discharging of the energy storage capacitor branch circuit, the fluctuation range of the output voltage Vout provided by the BOOST circuit is adjustable through the charging and discharging control, and when the fluctuation approaches zero, the output voltage Vout provided by the BOOST circuit can be considered to be maintained at stable output.
It should be noted that the field effect transistor Q is controlled by the control chip U, the first end of the resistor R1 is connected to the cathode of the diode D1, the second end is connected to the voltage feedback end of the control chip U, and the second end is further connected to the resistor R2 in series and then grounded, considering that the resistor R1 and the resistor R2 form a voltage dividing branch, and when the output voltage Vout fluctuates, the feedback voltage VFB at the second end also fluctuates correspondingly, so that the control chip U adjusts the duty ratio according to the feedback voltage VFB obtained from the voltage feedback end, and the duty ratio can be used for turning on or off the field effect transistor Q to further adjust the fluctuation of the output voltage Vout, and if the adjusted duty ratio makes the fluctuation tend to zero, it is considered that the output voltage Vout of the BOOST circuit in the current environment is maintained at a stable output.
As a preferred embodiment of the present application, the control method specifically includes the following steps:
comparing the feedback voltage obtained from the voltage feedback end with a set voltage threshold;
if the feedback voltage is below the voltage threshold, adjusting and outputting a duty ratio for controlling a Q switch of the field effect transistor, so that the output voltage Vout is kept stable;
and if the feedback voltage exceeds the voltage threshold, triggering the field effect transistor Q to cut off.
In the embodiment of the present application, if the output voltage Vout is stable, the feedback voltage VFB between the voltage R1 and the resistor R2 should also be stable; the feedback voltage which should be stable is the set voltage threshold or is slightly lower than the set voltage threshold, and the specific value of the voltage threshold is determined according to experience or precision requirements; meanwhile, the mathematical relationship between the voltage V1 of the feedback voltage VFB and the voltage V2 of the output voltage Vout is related to the resistance values of the voltage R1 and the resistor R2, that is, V2 is V1 · (R1+ R2)/R2, so that the control chip U can determine whether the output voltage Vout is stable according to the obtained feedback voltage VFB, and the magnitude of the output voltage Vout can also be determined by the duty cycle of triggering the on and off of the fet Q, and therefore when the voltage value of the feedback voltage VFB is below the voltage threshold, the duty cycle of controlling the on and off of the fet Q is adjusted and output, so that the output voltage Vout can be kept stable.
When the voltage value of the feedback voltage VFB exceeds the voltage threshold value, the current on the BOOST circuit is over-current, the control chip U controls the field-effect tube Q to be cut off to protect the BOOST circuit, the field-effect tube Q is cut off to reduce the output voltage Vout, and after the voltage value of the feedback voltage VFB is reduced to be lower than the voltage threshold value, the control chip U continues to output the duty ratio to control the normal conduction and cut-off of the field-effect tube Q, so that the overvoltage protection of the BOOST circuit is realized.
It should be noted that, as will be clear to those skilled in the art, for convenience and brevity of description, the specific working process of the method described above may refer to the corresponding process in the aforementioned BOOST circuit embodiment, and is not described herein again.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A BOOST booster circuit is characterized by comprising an energy storage inductor L, a diode D1, an energy storage capacitor branch circuit, a resistor R1, a resistor R2, a control chip U and a field effect transistor Q;
one end of the energy storage inductor L is connected to the anode of the diode D1, the other end of the energy storage inductor L is configured to receive an input voltage Vin, the cathode of the diode D1 is configured to output a boosted output voltage Vout and is connected to one end of the energy storage capacitor branch, and the other end of the energy storage capacitor branch is grounded;
the first end of the resistor R1 is connected with the cathode of the diode D1, and the second end of the resistor R1 is connected with the ground after being connected with the resistor R2 in series;
a voltage feedback end of the control chip U is connected with a second end of the resistor R1, and a driving end of the control chip U is connected with an anode of the diode D1 through the field effect transistor Q;
meanwhile, the control chip U is configured to adjust the duty ratio according to the feedback voltage obtained from the voltage feedback terminal, so that the fluctuation of the output voltage Vout is regulated by the switching of the field effect transistor Q.
2. The BOOST circuit of claim 1, wherein the control chip U is further configured to:
comparing the obtained feedback voltage with a set voltage threshold;
if the feedback voltage is below the voltage threshold, adjusting and outputting a duty ratio for controlling a Q switch of the field effect transistor, so that the output voltage Vout is kept stable;
and if the feedback voltage exceeds the voltage threshold, triggering the field effect transistor Q to cut off.
3. The BOOST circuit according to claim 1, wherein the source of the fet Q is connected in series with a resistor R6 and then grounded, and the current feedback terminal of the control chip U is connected to the source of the fet Q through an RC filter branch.
4. The BOOST BOOST circuit of claim 3, wherein said RC filter circuit includes a resistor R4 and a capacitor C4,
one end of the resistor R4 is connected with the source electrode of the field effect transistor Q, the other end is connected with the current feedback end of the control chip U,
one end of the capacitor C4 is connected with the current feedback end, and the other end is connected with the analog ground end of the control chip U.
5. The BOOST circuit of claim 4, wherein the control chip U is further configured to:
if the voltage of the resistor R4 exceeds a set voltage limit, the comparator controls the switching frequency of the field effect transistor Q to be reduced.
6. The BOOST circuit according to claim 3, wherein the gate of said fet Q is connected to said drive terminal through a resistor R5, and/or the drain of said fet Q is directly connected to the anode of said diode D1.
7. The BOOST circuit according to claim 1, wherein the energy storage capacitor branch comprises two capacitors, the two capacitors are connected in parallel, and one end of the capacitor is connected to the first end, and the other end of the capacitor is grounded.
8. The BOOST circuit of claim 1, further comprising:
the first filtering branch circuit comprises a capacitor C5 and a diode D2, the capacitor C5, the diode D2 and the energy storage inductor L are sequentially connected in series end to end, the anode of the diode D2 is grounded, and the cathode of the diode D2 is also connected with the anode of the diode D1; and/or
And the second filtering branch circuit comprises a resistor R3 and a capacitor C3, one end of the resistor R3 is connected with a forward voltage Vcc, the other end of the resistor R3 and one end of the capacitor C3 are both connected with the power supply end, and the other end of the capacitor C3 is grounded.
9. A control method for a BOOST BOOST circuit according to any one of claims 1 to 8, characterized by comprising the following steps:
and adjusting the duty ratio according to the feedback voltage acquired from the voltage feedback end, so that the fluctuation of the output voltage Vout is adjusted through the switch of the field effect transistor Q.
10. The method of controlling a BOOST circuit according to claim 9, comprising the steps of:
comparing the feedback voltage obtained from the voltage feedback end with a set voltage threshold;
if the feedback voltage is below the voltage threshold, adjusting and outputting a duty ratio for controlling a Q switch of the field effect transistor, so that the output voltage Vout is kept stable;
and if the feedback voltage exceeds the voltage threshold, triggering the field effect transistor Q to cut off.
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