CN117559802A - Step-down output circuit - Google Patents

Step-down output circuit Download PDF

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Publication number
CN117559802A
CN117559802A CN202311289952.5A CN202311289952A CN117559802A CN 117559802 A CN117559802 A CN 117559802A CN 202311289952 A CN202311289952 A CN 202311289952A CN 117559802 A CN117559802 A CN 117559802A
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CN
China
Prior art keywords
configuration
voltage
module
triode
resistor
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Pending
Application number
CN202311289952.5A
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Chinese (zh)
Inventor
乔进军
杨英振
伊昕
刘正尧
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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Priority to CN202311289952.5A priority Critical patent/CN117559802A/en
Publication of CN117559802A publication Critical patent/CN117559802A/en
Pending legal-status Critical Current

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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
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The application discloses a step-down output circuit includes: the device comprises a voltage input end, a first configuration end, a second configuration end, a voltage output end, a feedback module, an enabling control module and a configuration module; the enabling control module is respectively connected with the feedback module and the configuration module, the feedback module is respectively connected with the voltage input end and the voltage output end, the configuration module is respectively connected with the first configuration end and the second configuration end, and the configuration module is also connected with the feedback module; the enabling control module is configured to provide an enabling signal to the configuration module and the feedback module; the configuration module is configured to adjust the output voltage of the voltage output terminal according to different inputs and enable signals of the first configuration terminal and the second configuration terminal. The first configuration end and the second configuration end can carry out input configuration according to the voltage output by the first configuration end and the second configuration end, so that output voltage is configurable, the use flexibility is improved, and in the scheme, discrete devices are adopted, so that the use of high-cost integrated chips is avoided.

Description

Step-down output circuit
Technical Field
The application relates to the technical field of circuits, in particular to a voltage-reducing output circuit.
Background
With the advancement of social technology, electronic chips are increasingly used in various fields and industries. A voltage step-down circuit is usually provided in the electronic chip to reduce the input voltage and provide the electronic chip with a desired output voltage, for example, to reduce the input voltage of 12V to an output voltage of 5V or an output voltage of 7V.
Conventional BUCK circuits typically employ integrated chips to reduce the input voltage, such as low dropout linear voltage regulator integrated chips or BUCK integrated chips.
However, the integrated chip is costly and has poor flexibility in use.
Disclosure of Invention
The purpose of the present application is to provide a buck output circuit, which aims at overcoming the defects of the prior art, and the purpose is achieved through the following technical scheme.
The first aspect of the present application proposes a buck output circuit, including a voltage input terminal, a first configuration terminal, a second configuration terminal, a voltage output terminal, a feedback module, an enable control module, and a configuration module;
the enabling control module is respectively connected with the feedback module and the configuration module, the feedback module is respectively connected with the voltage input end and the voltage output end, the configuration module is respectively connected with the first configuration end and the second configuration end, and the configuration module is also connected with the feedback module;
the enabling control module is configured to provide an enabling signal to the configuration module and the feedback module; the configuration module is configured to adjust an output voltage of the voltage output terminal according to inputs of the first configuration terminal and the second configuration terminal and the enable signal.
In some embodiments of the present application, the enable control module includes a first triode, a first resistor, and an enable terminal; the base of the first triode is connected with the enabling end through the first resistor, the collector of the first triode is connected with the feedback module, and the emitter of the first triode is respectively connected with the feedback module and the configuration module.
In some embodiments of the present application, the configuration module includes a first voltage configuration unit and a second voltage configuration unit; the first voltage configuration unit and the second voltage configuration unit are both connected with the enabling control module and the feedback module, the first voltage configuration unit is also connected with the first configuration end, and the second voltage configuration unit is also connected with the second configuration end.
In some embodiments of the present application, the first voltage configuration unit includes a second triode, a second resistor, and a third resistor; the base of the second triode is connected with the first configuration end through the second resistor, the collector of the second triode is respectively connected with the enabling control module and the feedback module, and the emitter of the second triode is grounded through the third resistor.
In some embodiments of the present application, the first voltage configuration unit further includes a fourth resistor, and the base of the second triode is further grounded through the fourth resistor.
In some embodiments of the present application, the second voltage configuration unit includes a third transistor, a fifth resistor, and a sixth resistor; the base of the third triode is connected with the second configuration end through the fifth resistor, the collector of the third triode is respectively connected with the enabling control module and the feedback module, and the emitter of the third triode is grounded through the sixth resistor.
In some embodiments of the present application, the second voltage configuration unit further includes a seventh resistor, and the base of the third triode is further grounded through the seventh resistor.
In some embodiments of the present application, the feedback module includes a fourth transistor and an eighth resistor; the base of the fourth triode is connected with the enabling control module, the emitter of the fourth triode is connected with the voltage input end, the collector of the fourth triode is connected with the voltage output end, and the collector is respectively connected with the enabling control module and the configuration module through an eighth resistor.
In some embodiments of the present application, the voltage output terminal outputs the first voltage when the first configuration terminal is pulled high and the second configuration terminal is pulled low; the voltage output terminal outputs a second voltage when the first configuration terminal is pulled down and the second configuration terminal is pulled up.
A second aspect of the present application proposes an electronic chip, including the step-down output circuit of the first aspect, a voltage output terminal of the step-down output circuit being connected to a power supply terminal of the electronic chip.
Based on the step-down output circuit, the step-down output circuit has at least the following beneficial effects or advantages:
the enabling control module provides enabling signals for the configuration module and the feedback module, and the voltage output end of the feedback module is adjusted to output required voltage for supplying power to the electronic chip according to different input and enabling signals of the first configuration end and the second configuration end through the configuration module. The first configuration end and the second configuration end can carry out input configuration according to the voltage output by the first configuration end and the second configuration end, so that output voltage is configurable, the use flexibility is improved, and in the scheme, discrete devices are adopted, so that the use of high-cost integrated chips is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:
FIG. 1 is a block diagram of a buck output circuit according to an exemplary embodiment of the present application;
fig. 2 is a specific structural diagram of a buck output circuit according to an exemplary embodiment of the present application.
The reference numerals in the drawings are as follows:
the step-down output circuit 100 comprises an enabling control module 10, a configuration module 20, a feedback module 30, a voltage input end A, a voltage output end D, a first configuration end B and a second configuration end C;
the first triode Q1, the first resistor R1, enable end E;
the first voltage configuration unit 201, the second triode Q2, the second resistor R2, the third resistor R3 and the fourth resistor R4;
the second voltage configuration unit 202, the third triode Q3, the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7;
fourth triode Q4, eighth resistor R8.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present application as detailed in the accompanying claims.
The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, a first message may also be referred to as a second message, and similarly, a second message may also be referred to as a first message, without departing from the scope of the present application. The word "if" as used herein may be interpreted as "at … …" or "at … …" or "responsive to a determination", depending on the context.
Fig. 1 is a block diagram of a buck output circuit according to an exemplary embodiment of the present application, where the buck output circuit 100 includes a voltage input terminal a, a first configuration terminal B, a second configuration terminal C, a voltage output terminal D, a feedback module 30, an enable control module 10, and a configuration module 20.
The enabling control module 10 is connected to the feedback module 30 and the configuration module 20, and is used for enabling the configuration module 20 and the feedback module 30, that is, the enabling control module 10 may provide enabling signals to the feedback module 30 and the configuration module 20.
The feedback module 30 is connected to a voltage input terminal a and a voltage output terminal D, where the voltage input terminal a is used to input a supply voltage to the step-down output circuit 100, and the voltage output terminal D is used to output a supply voltage provided to the electronic chip, and generally, the supply voltage input by the voltage input terminal a is higher than the supply voltage output by the voltage output terminal D, so as to implement the step-down function.
The configuration module 20 is connected to the first configuration terminal B and the second configuration terminal C, respectively, the configuration module 20 is further connected to the feedback module 30, and the configuration module 20 is configured to adjust the output voltage of the voltage output terminal D according to different inputs of the first configuration terminal B and the second configuration terminal C and the enable signal provided by the enable control module 10.
Based on the above-described buck output circuit 100, the enable control module 10 provides the enable signals to the configuration module 20 and the feedback module 30, and the configuration module 20 adjusts the voltage output terminal D of the feedback module 30 to output a desired voltage according to different inputs of the first configuration terminal B and the second configuration terminal C and the enable signals, so as to supply power to the electronic chip. The first configuration end B and the second configuration end C can carry out input configuration according to the voltage required to be output, so that the output voltage is configurable, the use flexibility is improved, and in the scheme, discrete devices are adopted, so that the use of high-cost integrated chips is avoided.
In some embodiments of the present application, as shown in fig. 2, the enable control module 10 includes a first transistor Q1, a first resistor R1, and an enable terminal E. The base of the first triode Q1 is connected with the enabling end E through a first resistor R1, the collector of the first triode Q1 is connected with the feedback module 30, and the emitter of the first triode Q1 is respectively connected with the feedback module 30 and the configuration module 20. When the voltage output terminal D is required to output voltage, the enable terminal E is pulled up to 5V, and at this time, the first transistor Q1 is turned on, and outputs an enable signal.
In some embodiments of the present application, as shown in fig. 2, the configuration module 20 includes a first voltage configuration unit 201 and a second voltage configuration unit 202. The first voltage configuration unit 201 and the second voltage configuration unit 202 are both connected to the enable control module 10 and the feedback module 30, the first voltage configuration unit 201 is further connected to the first configuration terminal B, and the second voltage configuration unit 202 is further connected to the second configuration terminal C.
The first voltage configuration unit 201 is configured to adjust the voltage output terminal D of the feedback module 30 to output a first voltage. The second voltage configuration unit 202 is configured to adjust the voltage output terminal D of the feedback module 30 to output a second voltage. The first voltage and the second voltage are both smaller than the supply voltage input by the voltage input terminal a.
In one embodiment, the first voltage configuration unit 201 includes a second transistor Q2, a second resistor R2, and a third resistor R3. The base of the second triode Q2 is connected with the first configuration end B through a second resistor R2, the collector of the second triode Q2 is connected with the emitter of the first triode Q1 in the enabling control module 10, the collector of the second triode Q2 is also connected with the feedback module 30, and the emitter of the second triode Q2 is grounded through a third resistor R3. The first voltage configuration unit 201 specifically adjusts the voltage output terminal D of the feedback module 30 through the third resistor R3 to output the first voltage.
Further, the first voltage configuration unit 201 further includes a fourth resistor R4, and the base of the second transistor Q2 is further grounded through the fourth resistor R4.
In one embodiment, the second voltage configuration unit 202 includes a third transistor Q3, a fifth resistor R5, and a sixth resistor R6. The base of the third triode Q3 is connected with the second configuration end C through a fifth resistor R5, the collector of the third triode Q3 is connected with the emitter of the first triode Q1 in the enabling control module 10, the collector of the third triode Q3 is also connected with the feedback module 30, and the emitter of the third triode Q3 is grounded through a sixth resistor R6. The second voltage configuration unit 202 specifically adjusts the voltage output terminal D of the feedback module 30 through the sixth resistor R6 to output the second voltage.
Further, the second voltage configuration unit 202 further includes a seventh resistor R7, and the base of the third transistor Q3 is further grounded through the seventh resistor R7.
Here, the first transistor Q1, the second transistor Q2, and the third transistor Q3 are NPN transistors.
In some embodiments of the present application, as shown in fig. 2, the feedback module 30 includes a fourth transistor Q4 and an eighth resistor R8. The base of the fourth triode Q4 is connected with the enabling control module 10, the emitter of the fourth triode Q4 is connected with the voltage input end A, the collector of the fourth triode Q4 is connected with the voltage output end D, and the collector of the fourth triode Q4 is respectively connected with the emitter of the first triode Q1 of the enabling control module 10, the collector of the second triode Q2 of the configuration module 20 and the collector of the third triode Q3 through an eighth resistor R8. The eighth resistor R8 in the feedback module 30 is used to regulate the output voltage of the voltage output terminal D together with the configuration module 20.
Based on the specific structure of the step-down output circuit 100 shown in fig. 2, when the first configuration terminal B is pulled up and the second configuration terminal B is pulled down in the case where the voltage input terminal a inputs the power supply voltage, the voltage output terminal D outputs the first voltage; when the first configuration terminal B is pulled down and the second configuration terminal C is pulled up, the voltage output terminal D outputs the second voltage. It can be seen that different input combinations of the first configuration terminal B and the second configuration terminal C can cause the buck output circuit 100 to output different voltages.
Based on the two requirements of 7.5V and 5V for the supply voltage of the electronic chip, in one example, when the first configuration terminal B is pulled up to 5V and the second configuration terminal C is pulled down to 0V, the first voltage output by the voltage output terminal D may be configured to 7.5V.
In another example, when the first configuration terminal B is pulled down to 0V and the second configuration terminal C is pulled up to 5V, the second voltage output from the voltage output terminal D may be configured to 5V.
The working principle of the buck output circuit 100 is described below by taking the configuration of the second voltage output by the voltage output terminal D as an example, the enable terminal E is pulled up to 5V, the second configuration terminal C is pulled up to 5V, the first configuration terminal B is pulled down to 0V, at this time, the first transistor Q1, the third transistor Q3 and the fourth transistor Q4 are all turned on, the second transistor Q2 is turned off, and the conduction voltage drop between the base and the emitter of the transistor is 0.7V, so the emitter voltage of the first transistor Q1 is initially 5-0.7=4.3V. Because the base electrode and the emitter electrode of the first triode Q1 are increased, according to the triode current amplification principle, the collector electrode and the emitter electrode of the first triode Q1 are increased, namely the base electrode and the emitter electrode of the fourth triode Q4 are increased, at this time, the collector electrode and the emitter electrode of the fourth triode Q4 are amplified according to the factor P, the amplified current is divided by the eighth resistor R8 and the sixth resistor R6, the emitter electrode voltage of the first triode Q1 is raised, the current between the base electrode and the emitter electrode of the first triode Q1 is reduced, and therefore the first triode Q1, the fourth triode Q4 and the eighth resistor R8 form a stable closed loop, and after the closed loop is stabilized, the emitter electrode voltage of the first triode Q1 is 4.4V through simulation test.
After the closed loop is stabilized, assuming that the current between the emitter and the base of the first transistor Q1 is a and the transistor amplification is β (the transistor amplification β is generally about 200), the current between the collector and the emitter of the first transistor Q1 is (1+β) a and the current between the emitter and the collector of the fourth transistor Q4 is β (1+β) a, which is approximately equal to β 2 a, since the current flowing through the eighth resistor R8 substantially matches the current flowing through the sixth resistor R6, the output voltage of the voltage output terminal D can be obtained as:
wherein U is SC The emitter voltage of the first triode Q1 is 4.4V, is fixed and unchanged, U SCE The conduction voltage drop between the collector and the emitter of the third triode Q3 is 0.2V, and is constant. As can be seen from the above formula, by configuring the sixth resistor R6 and the eighth resistor R8, it is ensured that the second voltage output from the voltage value output terminal D is configured to be 5V.
Taking the example that the first voltage output by the voltage output end D is configured to 7.5V, describing the working principle of the buck output circuit 100, pulling the enable end E high to 5V, pulling the second configuration end C low to 0V, pulling the first configuration end B high to 5V, at this time, the first triode Q1, the second triode Q2, and the fourth triode Q4 are all turned on, the third triode Q3 is turned off, then the working principle of each circuit node is equivalent to the above-mentioned case of outputting 5V voltage, and the output voltage of the voltage output end D is:
wherein U is SC The emitter voltage of the first triode Q1 is still 4.4V, which is fixed and unchanged, U SCE Still 0.2V, is fixed, but only represents a conduction voltage drop between the collector and the emitter of the second transistor Q2 of 0.2V. As can be seen from the above formula, by configuring the third resistor R3 and the eighth resistor R8, it is ensured that the first voltage output from the voltage value output terminal D is configured to be 7.5V.
Based on the above-described step-down output circuit 100, the present application uses the component characteristics of the triode, after cascading and combining two triodes, applies the component characteristics of triode current amplification, uses the small current of the first triode Q1 to generate a large current on the fourth triode Q4, and the large current raises the voltage through the feedback resistors R3 and R8 or the resistors R6 and R8, so as to inhibit the current of the first triode Q1 from continuously increasing, thereby forming a simple closed-loop control system, and realizing stable step-down output.
Another embodiment of the present application further provides an electronic chip, including the step-down output circuit described in the foregoing embodiment, where a voltage output end of the step-down output circuit is connected to a power supply end of the electronic chip. For powering the electronic chip.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It should also be noted that 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 one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
The foregoing description of the preferred embodiments of the present invention is not intended to limit the invention to the precise form disclosed, and any modifications, equivalents, improvements and alternatives falling within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. The voltage reduction output circuit is characterized by comprising a voltage input end, a first configuration end, a second configuration end, a voltage output end, a feedback module, an enabling control module and a configuration module;
the enabling control module is respectively connected with the feedback module and the configuration module, the feedback module is respectively connected with the voltage input end and the voltage output end, the configuration module is respectively connected with the first configuration end and the second configuration end, and the configuration module is also connected with the feedback module;
the enabling control module is configured to provide an enabling signal to the configuration module and the feedback module; the configuration module is configured to adjust the output voltage of the voltage output terminal according to different inputs of the first configuration terminal and the second configuration terminal and the enable signal.
2. The buck output circuit according to claim 1, wherein the enable control module includes a first transistor, a first resistor, and an enable terminal;
the base of the first triode is connected with the enabling end through the first resistor, the collector of the first triode is connected with the feedback module, and the emitter of the first triode is respectively connected with the feedback module and the configuration module.
3. The buck output circuit according to claim 1, wherein the configuration module includes a first voltage configuration unit and a second voltage configuration unit;
the first voltage configuration unit and the second voltage configuration unit are both connected with the enabling control module and the feedback module, the first voltage configuration unit is also connected with the first configuration end, and the second voltage configuration unit is also connected with the second configuration end.
4. The buck output circuit according to claim 3, wherein the first voltage configuration unit includes a second triode, a second resistor, and a third resistor;
the base of the second triode is connected with the first configuration end through the second resistor, the collector of the second triode is respectively connected with the enabling control module and the feedback module, and the emitter of the second triode is grounded through the third resistor.
5. The buck output circuit according to claim 4, wherein the first voltage configuration unit further includes a fourth resistor, and the base of the second transistor is further coupled to ground through the fourth resistor.
6. The buck output circuit according to claim 3, wherein the second voltage configuration unit includes a third triode, a fifth resistor, and a sixth resistor;
the base of the third triode is connected with the second configuration end through the fifth resistor, the collector of the third triode is respectively connected with the enabling control module and the feedback module, and the emitter of the third triode is grounded through the sixth resistor.
7. The buck output circuit according to claim 6, wherein the second voltage configuration unit further includes a seventh resistor, and the base of the third transistor is further coupled to ground through the seventh resistor.
8. The buck output circuit according to claim 1, wherein the feedback module includes a fourth transistor and an eighth resistor;
the base of the fourth triode is connected with the enabling control module, the emitter of the fourth triode is connected with the voltage input end, the collector of the fourth triode is connected with the voltage output end, and the collector is respectively connected with the enabling control module and the configuration module through an eighth resistor.
9. The buck output circuit according to any one of claims 1-8, wherein the voltage output terminal outputs a first voltage when the first configuration terminal is pulled high and the second configuration terminal is pulled low;
the voltage output terminal outputs a second voltage when the first configuration terminal is pulled down and the second configuration terminal is pulled up.
10. An electronic chip comprising the buck output circuit of any one of claims 1-10, wherein a voltage output terminal of the buck output circuit is connected to a power supply terminal of the electronic chip.
CN202311289952.5A 2023-10-07 2023-10-07 Step-down output circuit Pending CN117559802A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311289952.5A CN117559802A (en) 2023-10-07 2023-10-07 Step-down output circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311289952.5A CN117559802A (en) 2023-10-07 2023-10-07 Step-down output circuit

Publications (1)

Publication Number Publication Date
CN117559802A true CN117559802A (en) 2024-02-13

Family

ID=89819274

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311289952.5A Pending CN117559802A (en) 2023-10-07 2023-10-07 Step-down output circuit

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