CN111614248A - Direct current voltage reduction circuit and method and step type direct current voltage reduction circuit - Google Patents
Direct current voltage reduction circuit and method and step type direct current voltage reduction circuit Download PDFInfo
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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
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
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Abstract
The application relates to a direct current voltage reduction circuit, a method and a step type direct current voltage reduction circuit, wherein the direct current voltage reduction circuit comprises: the voltage feedback unit is used for generating feedback voltage according to the output voltage value of the direct-current voltage reduction circuit; and the voltage reduction unit is connected with the voltage feedback unit and used for generating a reduced voltage by comparing the feedback voltage with the reference voltage of the voltage reduction unit. This direct current step-down circuit simple structure, easy realization can effectively reduce direct current output voltage to under the prerequisite that satisfies the circuit performance, make the line lamp width narrower, satisfy each line lamp equipment requirement. Improving the market competitiveness of the product.
Description
Technical Field
The invention relates to the field of lighting application, in particular to a direct-current voltage reduction circuit, a direct-current voltage reduction method and a stepped direct-current voltage reduction circuit.
Background
With the continuous development and progress of society, the outdoor lightening projects of buildings, landscapes and landmark buildings are more emphasized everywhere, and the LED lamp has the advantages of high light efficiency and low energy consumption and is widely applied to various decoration and advertisement industries. The number of line lamps needed by the outer wall of a building is large, the lamp strips need to be connected in series when being installed on site and share one switching power supply, and when the power and the power wire diameter of the switching power supply are not allowed to change, the problem can be solved only by improving the output voltage of the switching power supply in order to connect more lamp strips in series.
However, in order to realize controllable light, the line lamp is designed in a segmented manner, one segment of 6 lamps is usually used, the power supply voltage required for one segment of 6 lamps is 24V, and if the output voltage of the switching power supply is adjusted to 48V, the voltage needs to be reduced from 48V to 24V so as to normally light the light bar; if 3 lamps are one section, the required power voltage is 10.5V, 48V needs to be reduced to 10.5V, the more the reduced voltage is, the larger the peak current of the inductor is, and further the inductor with larger saturation current is needed, and the inductor with large saturation current means that the size of the inductor is increased, a line lamp with larger width needs to be used, the size of the line lamp is too large, the cost is increased, the field assembly requirement of each line lamp cannot be met, and the market competitiveness of products is lost.
Disclosure of Invention
In view of the above, it is necessary to provide a dc step-down circuit, a method and a step-down dc step-down circuit, which can reduce the output voltage, reduce the size of the line lamp and meet the assembling requirements of the line lamps.
A first aspect of the present application provides a dc voltage reduction circuit, including:
the voltage feedback unit is used for generating feedback voltage according to the output voltage value of the direct-current voltage reduction circuit;
and the voltage reduction unit is connected with the voltage feedback unit and used for generating a reduced voltage by comparing the feedback voltage with the reference voltage of the voltage reduction unit.
In the dc voltage-reducing circuit in the above embodiment, a voltage feedback unit configured to generate a feedback voltage according to an output voltage value of the dc voltage-reducing circuit, and a voltage-reducing unit connected to the voltage feedback unit are provided, and the voltage-reducing unit is configured to generate a reduced voltage by comparing the feedback voltage with a reference voltage of the voltage-reducing unit. This direct current step-down circuit simple structure, easy realization can effectively reduce direct current output voltage to under the prerequisite that satisfies the circuit performance, make the line lamp width narrower, satisfy each line lamp equipment requirement. Improving the market competitiveness of the product.
In one embodiment, the voltage feedback unit includes:
a first port of the first feedback resistor is connected with an output port of the circuit, and a second port of the first feedback resistor is connected with the voltage reduction unit;
a first port of the second feedback resistor is connected with a second port of the first feedback resistor and the voltage reduction unit, and a second port of the second feedback resistor is grounded;
the magnitude of the value of the feedback voltage is changed by adjusting the resistance values of the first feedback resistor and the second feedback resistor, so that the magnitude of the value of the buck voltage generated by the buck unit is changed.
In the dc voltage dropping circuit in the above embodiment, a first feedback resistor is provided between the output port of the power supply and the electrical connection path of the control unit, and a second feedback resistor is provided between the first feedback resistor and the connection path to ground. Based on the output voltage value of the direct current voltage reduction circuit, the resistance values of the first feedback resistor and the second feedback resistor are adjusted simultaneously to change the value of the feedback voltage so as to change the value of the reduced voltage generated by the voltage reduction unit.
In one embodiment, the method further comprises the following steps:
and the input filtering and voltage stabilizing unit is connected between a power supply and the voltage reducing unit in series, filters the input voltage of the voltage reducing unit and enables the input voltage to be smooth.
In the dc voltage-reducing circuit in the above embodiment, the input filter voltage-stabilizing unit is connected in series between the power supply and the electrical connection path of the voltage-reducing unit, so as to filter the input voltage of the voltage-reducing unit and smooth the input voltage.
In one embodiment, the method further comprises the following steps:
and the output filtering and voltage stabilizing unit is respectively connected with the voltage reducing unit and the output port of the circuit and is used for filtering the output voltage of the voltage reducing unit so that the output voltage of the direct current voltage reducing circuit is gentle.
In the dc voltage-reducing circuit in the above embodiment, an output filtering and voltage-stabilizing unit is disposed between the voltage-reducing unit and a connection path of an output port of the circuit, and is used for filtering an output voltage of the voltage-reducing unit, so that the output voltage of the dc voltage-reducing circuit is gentle.
In one embodiment, the input filter voltage stabilization unit includes:
a first port of the pull-up resistor is connected with the power supply, and a second port of the pull-up resistor is connected with the voltage reduction unit;
one end of the first electrolytic capacitor is connected with the power supply, the voltage reduction unit and the second port of the pull-up resistor, and the other end of the first electrolytic capacitor is grounded;
and one end of the first ceramic chip capacitor is connected with the power supply, the voltage reduction unit and the second port of the pull-up resistor, and the other end of the first ceramic chip capacitor is grounded.
In the dc voltage-reducing circuit in the above embodiment, a pull-up resistor is provided between the power supply and an electrical connection path of the voltage-reducing unit, so that the voltage entering the voltage-reducing unit is at a high level; the setting with the power, step-down unit reaches the first ceramic chip electric capacity that the second port of pull-up resistance all is connected, and the setting with the power, step-down unit reaches the first electrolytic capacitor that the second port of pull-up resistance all is connected carries out filtering rectification many times to the input voltage of step-down unit through first electrolytic capacitor and first ceramic chip electric capacity, and makes input voltage is mild, improves the stability and the reliability of step-down unit input voltage.
In one embodiment, the output filtering and voltage stabilizing unit includes:
a bootstrap capacitor connected to the voltage dropping unit;
a first port of the inductor is connected with the voltage reduction unit, and a second port of the inductor is connected with a voltage output port of the circuit;
and the negative electrode of the freewheeling diode is connected with the voltage reduction unit and the first port of the inductor, and the positive electrode of the freewheeling diode is grounded.
In the dc voltage-reducing circuit in the above embodiment, a bootstrap capacitor connected to the voltage-reducing unit is provided to ensure that the interior of the voltage-reducing unit can be completely conducted; an inductor is arranged between the voltage reduction unit and a passage of an output port of the circuit, a freewheeling diode is arranged between the output port of the circuit and the voltage reduction unit, when the interior of the voltage reduction unit is conducted, the inductor is charged to store energy, and the current of the inductor tends to rise; when the interior of the voltage reduction unit is disconnected, the inductor and the freewheeling diode form a closed loop, and the inductor supplies power to the freewheeling diode and an external load.
In one embodiment, the output filtering and voltage stabilizing unit further includes:
one end of the second electrolytic capacitor is connected with the second port of the inductor and the output port of the circuit, and the other end of the second electrolytic capacitor is grounded;
and one end of the second ceramic chip capacitor is connected with the second port of the inductor and the output port of the circuit, and the other end of the second ceramic chip capacitor is grounded.
In the dc voltage-reducing circuit in the above embodiment, by providing the second electrolytic capacitor connected to the second port of the inductor and the output port of the circuit, and the second ceramic capacitor connected to the second port of the inductor and the output port of the circuit, the output voltage of the voltage-reducing unit is filtered and rectified multiple times by the second electrolytic capacitor and the second ceramic capacitor, so that the output voltage is gentle, and the stability and reliability of the output voltage of the voltage-reducing unit are improved.
A second aspect of the present application provides a notch cuttype dc step-down circuit, including:
at least two series-connected direct current voltage reduction circuits are used for reducing the output current of the step-type direct current voltage reduction circuit.
A third aspect of the present application provides a dc voltage reduction method, including:
generating a feedback voltage according to the output voltage value of the direct current voltage reduction circuit based on a voltage feedback unit;
the step-down voltage is generated by comparing the feedback voltage with a reference voltage of the step-down unit based on the step-down unit.
In the direct current step-down method in the above-described embodiment, the step-down voltage is generated by generating the feedback voltage from the output voltage value of the direct current step-down circuit based on the voltage feedback unit, and by comparing the feedback voltage with the reference voltage of the step-down unit based on the step-down unit. The direct current voltage reduction method is simple, the circuit is easy to realize, the direct current output voltage can be effectively reduced, the width of the line lamp is narrower on the premise of meeting the circuit performance, and the assembly requirements of all the line lamps are met. Improving the market competitiveness of the product.
In one embodiment, the voltage feedback unit includes:
a first port of the first feedback resistor is connected with an output port of the circuit, and a second port of the first feedback resistor is connected with the voltage reduction unit;
a first port of the second feedback resistor is connected with a second port of the first feedback resistor and the voltage reduction unit, and a second port of the second feedback resistor is grounded;
the magnitude of the value of the feedback voltage is changed by adjusting the resistance values of the first feedback resistor and the second feedback resistor, so that the magnitude of the value of the buck voltage generated by the buck unit is changed.
In the dc step-down method in the above embodiment, a first feedback resistor is disposed between the output port of the power supply and the electrical connection path of the control unit, and a second feedback resistor is disposed between the first feedback resistor and the connection path to ground. Based on the output voltage value of the direct current voltage reduction circuit, the resistance values of the first feedback resistor and the second feedback resistor are adjusted simultaneously to change the value of the feedback voltage so as to change the value of the reduced voltage generated by the voltage reduction unit.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
For a better understanding of the description and/or illustration of embodiments and/or examples of those inventions disclosed herein, reference may be made to one or more of the drawings. The additional details or examples used to describe the figures should not be considered as limiting the scope of any of the disclosed inventions, the presently described embodiments and/or examples, and the presently understood best modes of these inventions.
Fig. 1 is a schematic circuit diagram of a dc voltage reduction circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic circuit diagram of a dc voltage reduction circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic circuit diagram of a dc voltage reduction circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic circuit diagram of a dc voltage reduction circuit according to an embodiment of the present disclosure;
fig. 5 is a schematic circuit diagram of a dc voltage reduction circuit according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of a partial circuit of a dc voltage reduction circuit according to an embodiment of the present disclosure;
fig. 7 is a schematic diagram of a partial circuit of a dc voltage reduction circuit according to an embodiment of the present disclosure;
fig. 8 is a schematic circuit diagram of a voltage reduction unit according to an embodiment of the present application;
fig. 9 is a schematic circuit diagram of a dc voltage reduction circuit according to an embodiment of the present application;
fig. 10 is a schematic circuit diagram of a stepped dc step-down circuit provided in an embodiment of the present application;
fig. 11 is a schematic flow chart of a dc voltage reduction method according to an embodiment of the present application.
Description of reference numerals: 100-direct current voltage reduction circuit, 200-load, 300-power supply, 10-voltage reduction unit, 20-voltage feedback unit, 30-input filter unit, 40-output filter unit and 50-phase compensation unit.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Where the terms "comprising," "having," and "including" are used herein, another element may be added unless an explicit limitation is used, such as "only," "consisting of … …," etc. Unless mentioned to the contrary, terms in the singular may include the plural and are not to be construed as being one in number.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present application.
In this application, unless otherwise expressly stated or limited, the terms "connected" and "connecting" are used broadly and encompass, for example, direct connection, indirect connection via an intermediary, communication between two elements, or interaction 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. In order to explain the technical solution of the present application, the following description will be given by way of specific examples.
In a dc step-down circuit provided in an embodiment of the present application, as shown in fig. 1, a dc step-down circuit 100 includes a voltage feedback unit 20 and a step-down unit 10. The voltage feedback unit 20 is configured to generate a feedback voltage according to an output voltage value of the dc voltage reduction circuit 100; the voltage dropping unit 10 is connected to the voltage feedback unit 20 for generating a dropped voltage by comparing the feedback voltage with a reference voltage of the voltage dropping unit 10.
In the dc voltage-reducing circuit in the above embodiment, a voltage feedback unit configured to generate a feedback voltage according to an output voltage value of the dc voltage-reducing circuit, and a voltage-reducing unit connected to the voltage feedback unit are provided, and the voltage-reducing unit is configured to generate a reduced voltage by comparing the feedback voltage with a reference voltage of the voltage-reducing unit. This direct current step-down circuit simple structure, easy realization can effectively reduce direct current output voltage to under the prerequisite that satisfies the circuit performance, make the line lamp width narrower, satisfy each line lamp equipment requirement. Improving the market competitiveness of the product.
Further, in a dc voltage dropping circuit provided in an embodiment of the present application, as shown in fig. 2, the voltage feedback unit 20 includes a first feedback resistor R1 and a second feedback resistor R2, a first port of the first feedback resistor R1 is connected to an output port of the circuit, and a second port of the first feedback resistor R1 is connected to the voltage dropping unit 10; second feedback resistor R2 a first port of the second feedback resistor R2 is connected to a second port of the first feedback resistor R1 and the voltage-dropping unit 10, and a second port of the second feedback resistor R2 is grounded; wherein the magnitude of the feedback voltage is changed by adjusting the resistance values of the first feedback resistor R1 and the second feedback resistor R2 to change the magnitude of the voltage dropping generated by the voltage dropping unit 10.
Further, in a dc voltage reduction circuit provided in an embodiment of the present application, as shown in fig. 3, the dc voltage reduction circuit 100 further includes an input filter voltage stabilization unit 30 connected in series between the power supply 300 and the voltage reduction unit 10, and configured to filter an input voltage of the voltage reduction unit 10 and smooth the input voltage.
In the dc voltage-reducing circuit in the above embodiment, an output filtering and voltage-stabilizing unit is disposed between the voltage-reducing unit and a connection path of an output port of the circuit, and is used for filtering an output voltage of the voltage-reducing unit, so that the output voltage of the dc voltage-reducing circuit is gentle.
Further, in a dc voltage-reducing circuit provided in an embodiment of the present application, as shown in fig. 4, the dc voltage-reducing circuit 100 further includes an output filtering and voltage-stabilizing unit 40, which is respectively connected to the voltage-reducing unit 10 and an output port of the circuit, and is configured to filter an output voltage of the voltage-reducing unit 10, so that the output voltage of the dc voltage-reducing circuit 100 is gentle.
In the dc voltage-reducing circuit in the above embodiment, an output filtering and voltage-stabilizing unit is disposed between the voltage-reducing unit and a connection path of an output port of the circuit, and is used for filtering an output voltage of the voltage-reducing unit, so that the output voltage of the dc voltage-reducing circuit is gentle.
Further, in a dc step-down circuit provided in an embodiment of the present application, as shown in fig. 5, the input filter voltage stabilization unit 30 includes: a pull-up resistor R3, a first electrolytic capacitor C1 and a first ceramic chip capacitor C2. A first port of the pull-up resistor R3 is connected to the power supply 300, and a second port of the pull-up resistor R3 is connected to the voltage dropping unit 10, so that the voltage entering the voltage dropping unit 10 is at a high level; one end of a first electrolytic capacitor C1 is connected to the power supply 300, the voltage reduction unit 10 and the second port of the pull-up resistor R3, and the other end of the first electrolytic capacitor C1 is grounded; one end of the first ceramic chip capacitor C2 is connected to the power supply 300, the voltage reduction unit 10 and the second port of the pull-up resistor R3, and the other end of the first ceramic chip capacitor C2 is grounded, so that the input voltage of the voltage reduction unit is filtered and rectified for multiple times through the first electrolytic capacitor and the first ceramic chip capacitor, the input voltage is gentle, and the stability and reliability of the input voltage of the voltage reduction unit are improved.
In the dc voltage-reducing circuit in the above embodiment, a pull-up resistor is provided between the power supply and an electrical connection path of the voltage-reducing unit, so that the voltage entering the voltage-reducing unit is at a high level; the setting with the power, step-down unit reaches the first ceramic chip electric capacity that the second port of pull-up resistance all is connected, and the setting with the power, step-down unit reaches the first electrolytic capacitor that the second port of pull-up resistance all is connected carries out filtering rectification many times to the input voltage of step-down unit through first electrolytic capacitor and first ceramic chip electric capacity, and makes input voltage is mild, improves the stability and the reliability of step-down unit input voltage.
Further, in a dc step-down circuit provided in an embodiment of the present application, as shown in fig. 6, the output filter voltage stabilizing unit 40 includes a bootstrap capacitor C3, an inductor L, and a freewheeling diode D1. The bootstrap capacitor C3 is connected to the voltage-reducing unit 10 to ensure that the interior of the voltage-reducing unit 100 can be fully conducted; a first port of the inductor L is connected to the voltage dropping unit 10, and a second port of the inductor L is connected to a voltage output port of the circuit 100; the negative electrode of the freewheeling diode D1 is connected to the voltage dropping unit 10 and the first port of the inductor L, and the positive electrode of the freewheeling diode D1 is grounded. When the interior of the voltage reduction unit 10 is conducted, the inductor L is charged to store energy, and the current passing through the inductor L tends to rise; when the inside of the voltage dropping unit 10 is opened, the inductor L forms a closed loop with the freewheel diode D1 by supplying power to the freewheel diode D1 and the external load 200.
In the dc voltage-reducing circuit in the above embodiment, a bootstrap capacitor connected to the voltage-reducing unit is provided to ensure that the interior of the voltage-reducing unit can be completely conducted; an inductor is arranged between the voltage reduction unit and a passage of an output port of the circuit, a freewheeling diode is arranged between the output port of the circuit and the voltage reduction unit, when the interior of the voltage reduction unit is conducted, the inductor is charged to store energy, and the current of the inductor tends to rise; when the interior of the voltage reduction unit is disconnected, the inductor and the freewheeling diode form a closed loop, and the inductor supplies power to the freewheeling diode and an external load.
Further, in a dc step-down circuit provided in an embodiment of the present application, as shown in fig. 7, the output filter voltage stabilizing unit 40 further includes a second electrolytic capacitor C4 and a second ceramic chip capacitor C5. One end of a second electrolytic capacitor C4 is connected with the second port of the inductor L and the output port of the circuit 100, and the other end of the second electrolytic capacitor C5 is grounded; one end of the second ceramic chip capacitor C5 is connected to the second port of the inductor L and the output port of the circuit 100, the other end of the second ceramic chip capacitor C5 is grounded, and the second electrolytic capacitor C4 and the second ceramic chip capacitor C5 perform multiple filtering and rectifying operations on the output voltage of the voltage reduction unit 10, so that the output voltage is gentle, and the stability and reliability of the output voltage of the voltage reduction unit 10 are improved.
In the dc voltage-reducing circuit in the above embodiment, by providing the second electrolytic capacitor connected to the second port of the inductor and the output port of the circuit, and the second ceramic capacitor connected to the second port of the inductor and the output port of the circuit, the output voltage of the voltage-reducing unit is filtered and rectified multiple times by the second electrolytic capacitor and the second ceramic capacitor, so that the output voltage is gentle, and the stability and reliability of the output voltage of the voltage-reducing unit are improved.
In a voltage-reducing unit provided in an embodiment of the present application, as shown in fig. 8, the voltage-reducing unit 10 includes a comparator and a logic circuit. One end of the bootstrap capacitor C3 is connected to the BOOT pin, and the other end is connected to the SW pin, so that the interior of the buck unit 10 is completely turned on. The FB pin of the voltage reducing unit 10 is connected to the voltage detecting unit 20, receives the feedback voltage detected by the voltage detecting unit 20, compares the feedback voltage with the reference voltage of the voltage reducing unit 10 via the comparator, generates a reduced voltage via the internal logic circuit, outputs the reduced voltage via the SW pin, and the output filter/voltage stabilizing unit 40 performs voltage stabilization filtering on the reduced voltage and outputs the filtered reduced voltage to the load 200.
In a dc voltage reduction circuit provided in an embodiment of the present application, as shown in fig. 9, the dc voltage reduction circuit 100 further includes a phase compensation unit 50, and the phase compensation unit 50 is connected to a COMP pin of the voltage reduction unit 10. The phase compensation unit 50 includes a compensation resistor R5, a first compensation capacitor C6, and a second compensation capacitor C7. One end of the compensation resistor R5 is connected to the voltage dropping unit 10, and the other end of the compensation resistor R5 is grounded. The first compensation capacitor C6 is connected to the compensation resistor R5 and ground, one end of the second compensation capacitor C7 is connected to the voltage step-down unit 10, and the other end of the second compensation capacitor C7 is grounded. The first compensation resistor C6 and the second compensation resistor C7 are arranged in parallel, the compensation resistor R5 is connected between the voltage reduction unit 10 and the first compensation resistor C6 in series, and the three are used as frequency compensation components to jointly stabilize a control loop.
Specifically, the dc voltage dropping circuit 100 further includes a switch resistor R4, one end of the switch resistor R4 is connected to the RT/SYNC pin of the voltage dropping unit 10, and the other end is grounded. The switch resistor R4 is used to connect to the clock source to synchronize the external circuit frequency.
More specifically, the GND pin of the voltage-reducing unit 10 is a ground pin, which provides a ground loop for the internal circuit of the voltage-reducing unit 10; the Pad pin of the voltage reduction unit 10 is grounded, is a heat dissipation Pad of the voltage reduction unit 10, and is used for large-area copper laying and heat dissipation so as to reduce the power of the voltage reduction unit 10 to the maximum extent; the VIN pin of the voltage reduction unit 10 is an input power voltage pin, and is connected to the first electrolytic capacitor C1, the first ceramic capacitor C2 and the power supply 300; the EN pin of the voltage dropping unit 10 is an enable pin, connected to the pull-up resistor R3, and provides a logic high level.
In a step-type dc step-down circuit provided in an embodiment of the present application, as shown in fig. 10, the step-type dc step-down circuit includes: at least two series-connected dc step-down circuits 100 as described above are used to reduce the output current of the step-down dc step-down circuit 100. As shown in fig. 9, the output terminal of the first dc voltage-reducing circuit and the input terminal of the second dc voltage-reducing circuit step-reduce the output voltage of the power supply.
In a dc voltage reduction method provided in an embodiment of the present application, as shown in fig. 11, the method includes the following steps:
step S202: generating a feedback voltage according to the output voltage value of the direct current voltage reduction circuit based on a voltage feedback unit;
step S204: the step-down voltage is generated by comparing the feedback voltage with a reference voltage of the step-down unit based on the step-down unit.
In the direct current step-down method in the above-described embodiment, the step-down voltage is generated by generating the feedback voltage from the output voltage value of the direct current step-down circuit based on the voltage feedback unit, and by comparing the feedback voltage with the reference voltage of the step-down unit based on the step-down unit. The direct current voltage reduction method is simple, the circuit is easy to realize, the direct current output voltage can be effectively reduced, the width of the line lamp is narrower on the premise of meeting the circuit performance, and the assembly requirements of all the line lamps are met. Improving the market competitiveness of the product.
Further, in a dc step-down method provided in an embodiment of the present application, as shown in fig. 11, the voltage feedback unit 20 includes: a first feedback resistor R1 and a second feedback resistor R2, a first port of the first feedback resistor R1 is connected with an output port of the circuit, and a second port of the first feedback resistor R1 is connected with the voltage reduction unit 10; a second feedback resistor R2, wherein a first port of the second feedback resistor R2 is connected to a second port of the first feedback resistor R1 and the voltage-reducing unit 10, and a second port of the second feedback resistor R2 is connected to ground; wherein the magnitude of the feedback voltage is changed by adjusting the resistance values of the first feedback resistor R1 and the second feedback resistor R2 to change the magnitude of the voltage dropping generated by the voltage dropping unit 10.
In the dc step-down method in the above embodiment, a first feedback resistor is disposed between the output port of the power supply and the electrical connection path of the control unit, and a second feedback resistor is disposed between the first feedback resistor and the connection path to ground. Based on the output voltage value of the direct current voltage reduction circuit, the resistance values of the first feedback resistor and the second feedback resistor are adjusted simultaneously to change the value of the feedback voltage so as to change the value of the reduced voltage generated by the voltage reduction unit.
For specific limitations of the dc voltage reduction method in the above embodiments, reference may be made to the above limitations of the dc voltage reduction circuit, which is not described herein again.
It should be understood that, although the steps in the flowchart of fig. 11 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 11 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A dc buck circuit, comprising:
the voltage feedback unit is used for generating feedback voltage according to the output voltage value of the direct-current voltage reduction circuit;
and the voltage reduction unit is connected with the voltage feedback unit and used for generating a reduced voltage by comparing the feedback voltage with the reference voltage of the voltage reduction unit.
2. The dc voltage reduction circuit according to claim 1, wherein the voltage feedback unit comprises:
a first port of the first feedback resistor is connected with an output port of the circuit, and a second port of the first feedback resistor is connected with the voltage reduction unit;
a first port of the second feedback resistor is connected with a second port of the first feedback resistor and the voltage reduction unit, and a second port of the second feedback resistor is grounded;
the magnitude of the value of the feedback voltage is changed by adjusting the resistance values of the first feedback resistor and the second feedback resistor, so that the magnitude of the value of the buck voltage generated by the buck unit is changed.
3. The dc voltage reduction circuit according to claim 1 or 2, further comprising:
and the input filtering and voltage stabilizing unit is connected between a power supply and the voltage reducing unit in series and is used for filtering the input voltage of the voltage reducing unit and enabling the input voltage to be smooth.
4. The dc voltage reduction circuit according to claim 1 or 2, further comprising:
and the output filtering and voltage stabilizing unit is respectively connected with the voltage reducing unit and the output port of the circuit and is used for filtering the output voltage of the voltage reducing unit and enabling the output voltage of the direct current voltage reducing circuit to be gentle.
5. The dc voltage reduction circuit of claim 3, wherein the input filter voltage stabilization unit comprises:
a first port of the pull-up resistor is connected with the power supply, and a second port of the pull-up resistor is connected with the voltage reduction unit;
one end of the first electrolytic capacitor is connected with the power supply, the voltage reduction unit and the second port of the pull-up resistor, and the other end of the first electrolytic capacitor is grounded;
and one end of the first ceramic chip capacitor is connected with the power supply, the voltage reduction unit and the second port of the pull-up resistor, and the other end of the first ceramic chip capacitor is grounded.
6. The DC buck circuit according to claim 4, wherein the output filter and voltage regulator unit comprises:
a bootstrap capacitor connected to the voltage dropping unit;
a first port of the inductor is connected with the voltage reduction unit, and a second port of the inductor is connected with a voltage output port of the circuit;
and the negative electrode of the freewheeling diode is connected with the voltage reduction unit and the first port of the inductor, and the positive electrode of the freewheeling diode is grounded.
7. The dc voltage dropping circuit according to claim 4, wherein the output filter voltage stabilizing unit further comprises:
one end of the second electrolytic capacitor is connected with the second port of the inductor and the output port of the circuit, and the other end of the second electrolytic capacitor is grounded;
and one end of the second ceramic chip capacitor is connected with the second port of the inductor and the output port of the circuit, and the other end of the second ceramic chip capacitor is grounded.
8. A step-type direct current step-down circuit is characterized by comprising:
at least two series-connected DC voltage-reducing circuits as claimed in any one of claims 1 to 7 for reducing the output current of the step-type DC voltage-reducing circuit.
9. A direct current voltage reduction method is characterized by comprising the following steps:
generating a feedback voltage according to the output voltage value of the direct current voltage reduction circuit based on a voltage feedback unit;
the step-down voltage is generated by comparing the feedback voltage with a reference voltage of the step-down unit based on the step-down unit.
10. The dc voltage reduction method according to claim 9, wherein the voltage feedback unit comprises:
a first port of the first feedback resistor is connected with an output port of the circuit, and a second port of the first feedback resistor is connected with the voltage reduction unit;
a first port of the second feedback resistor is connected with a second port of the first feedback resistor and the voltage reduction unit, and a second port of the second feedback resistor is grounded;
the magnitude of the value of the feedback voltage is changed by adjusting the resistance values of the first feedback resistor and the second feedback resistor, so that the magnitude of the value of the buck voltage generated by the buck unit is changed.
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| CN202010542964.4A CN111614248A (en) | 2020-06-15 | 2020-06-15 | Direct current voltage reduction circuit and method and step type direct current voltage reduction circuit |
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| CN202010542964.4A CN111614248A (en) | 2020-06-15 | 2020-06-15 | Direct current voltage reduction circuit and method and step type direct current voltage reduction circuit |
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| US20020024827A1 (en) * | 2000-08-24 | 2002-02-28 | International Rectifier Corporation | Current limited buck power supply |
| US20070165427A1 (en) * | 2006-01-13 | 2007-07-19 | Dell Products L.P. | Error voltage ripple compensation to extend bandwidth of a feedback loop in a DC-to-DC converter |
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