CN215300487U - Voltage reduction circuit - Google Patents
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- CN215300487U CN215300487U CN202121465606.4U CN202121465606U CN215300487U CN 215300487 U CN215300487 U CN 215300487U CN 202121465606 U CN202121465606 U CN 202121465606U CN 215300487 U CN215300487 U CN 215300487U
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Abstract
The utility model provides a step-down circuit, including first step-down module, second step-down module, power module and output module, the input of first step-down module and the input of second step-down module are parallelly connected at power module's output, and the output of first step-down module and the output of second step-down module are parallelly connected at output module's input, and first step-down module and second step-down module are arranged in exporting output module after power module's voltage step-down. The utility model discloses a design a step-down circuit, by two sets of the same step-down circuit parallel connection use to realize that the output adds and shares load current jointly with two sets of step-down power supply chip output current, makes the operation of step-down power supply chip more stable, efficiency is higher. And the utility model discloses the feedback voltage of parallel connection's common collection, the feedback voltage value that two step-down power supply chips acquireed is the same, and step-down power supply chip internal circuit automatically regulated makes output voltage stable.
Description
Technical Field
The utility model relates to the technical field of circuits, especially, relate to a step-down circuit.
Background
In various low-voltage electronic products and instruments, a high-power circuit or chip is often used, for example, a power amplifier module of a central control entertainment display screen for a passenger vehicle outputs 4 sound channels in total, each sound channel is 25W, the total maximum power output is 100W, if 12V input is used for calculation, the consumed current is about 8.3A, a 12V power amplifier module can be used in a 12V power supply of the passenger vehicle and meets the requirement, but the power amplifier module cannot be used in a commercial vehicle, and the power supply of the commercial vehicle is 24V, so that the 12V power amplifier module cannot be directly used, and only the 24V power amplifier module can be used. Because 24V power amplifier module only ST meaning method production in the market, the goods source is in shortage, and is expensive, and the chip shortage leads to unable normal production and supplies goods, and 12V power amplifier module has the production of many brand manufacturers, and the goods source is sufficient, but because commercial car power is 24V, need reduce to 12V and can use, and the current conventional single direct current step-down chip can only accomplish current 5A in the market generally, can not realize providing sufficient current 8.3A and supply power amplifier module and use.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a step-down circuit.
In order to realize the purpose, the following technical scheme is adopted:
a voltage reduction circuit comprises a first voltage reduction module, a second voltage reduction module, a power supply module and an output module, the input end of the first voltage reduction module and the input end of the second voltage reduction module are connected in parallel at the output end of the power supply module, the output end of the first voltage reduction module and the output end of the second voltage reduction module are connected in parallel at the input end of the output module, the first voltage reduction module and the second voltage reduction module are used for reducing the voltage of the power supply module and then outputting the voltage to the output module, a first inductor and the cathode of a first diode are connected between the output end of the first voltage reduction module and the input end of the output module, the anode of the first diode is grounded, a second inductor and the cathode of the second diode are connected between the output end of the second voltage reduction module and the input end of the output module, and the anode of the second diode is grounded; still include first feedback module, second feedback module, first frequency loop compensation module and second frequency loop compensation module, wherein: the input end of the first feedback module is connected with the output end of the first voltage reduction module, and the output end of the first feedback module is respectively connected with the feedback end of the first voltage reduction module and the feedback end of the second voltage reduction module and is used for feeding back the output voltage of the first voltage reduction module to the first voltage reduction module and the second voltage reduction module; the input end of the second feedback module is connected with the output end of the second voltage reduction module, and the output end of the second feedback module is respectively connected with the feedback end of the first voltage reduction module and the feedback end of the second voltage reduction module and used for feeding back the output voltage of the second voltage reduction module to the first voltage reduction module and the second voltage reduction module; the first frequency loop compensation module is respectively connected with the frequency loop compensation ends of the first voltage reduction module and the second voltage reduction module and is used for adjusting the output current drift of the first voltage reduction module and the second voltage reduction module; the second frequency loop compensation module is respectively connected with the frequency loop compensation ends of the first voltage reduction module and the second voltage reduction module and used for adjusting the output current drift of the first voltage reduction module and the second voltage reduction module, and the first voltage reduction module and the second voltage reduction module comprise the same voltage reduction power supply chip.
Further, still include first filtering module, second filtering module, third filtering module and fourth filtering module, first filtering module, second filtering module, third filtering module and fourth filtering module are parallelly connected by a plurality of electric capacity and are constituteed, wherein: the first filtering module is connected between the input end of the first voltage reduction module and the output end of the power supply module, and the first filtering module is grounded; the second filtering module is connected between the input end of the second voltage reduction module and the output end of the power supply module, and the second filtering module is grounded; the third filtering module is connected between the output end of the first voltage reduction module and the input end of the output module, and the third filtering module is grounded; the fourth filtering module is connected between the output end of the second voltage reduction module and the input end of the output module, and the fourth filtering module is grounded. The third filtering module and the fourth filtering module respectively filter the output noise waves of the first voltage reduction module and the second voltage reduction module, so that the output of the first voltage reduction module and the output of the second voltage reduction module are stable.
Further, the third filtering module is connected between the output end of the first inductor and the input end of the first feedback module, and the fourth filtering module is connected between the second inductor and the second feedback module.
Furthermore, the first filtering module, the second filtering module, the third filtering module and the fourth filtering module are respectively formed by connecting a plurality of capacitors with different magnitudes in parallel. For an actual capacitive element, due to the lead and the PCB wiring, the capacitive element is actually a series connection of an inductor and a capacitor and a resistor, the impedance of the inductor is increased along with the increase of the frequency value, the impedance of the capacitor is reduced along with the increase of the frequency, and the capacitors with different magnitudes are connected in series, so that the large capacitor filters low frequency waves, and the small capacitor filters high frequency waves.
Further, the first feedback module includes a first capacitor, a second capacitor, a first resistor, a second resistor, and a third resistor, the first resistor and the second resistor have different resistances, the first resistor and the second resistor are connected in series, the first capacitor, the first resistor, and the second resistor form a parallel circuit, wherein: the input end of a parallel circuit consisting of the first capacitor, the first resistor and the second resistor is connected with the output end of the first voltage reduction module, the output end of the parallel circuit is respectively connected with the feedback end of the first voltage reduction module, the feedback end of the second voltage reduction module, the second capacitor and the third resistor, and the second capacitor and the third resistor are respectively grounded; the second feedback module comprises a third capacitor, a fourth resistor, a fifth resistor and a sixth resistor, the fourth resistor and the fifth resistor have different resistance values, the fourth resistor and the fifth resistor are connected in series, and the third capacitor, the fourth resistor and the fifth resistor form a parallel circuit, wherein: the input end of a parallel circuit consisting of the third capacitor, the fourth resistor and the fifth resistor is connected with the output end of the second voltage reduction module, the output end of the parallel circuit is respectively connected with the feedback end of the first voltage reduction module, the feedback end of the second voltage reduction module, the fourth capacitor and the sixth resistor, and the fourth capacitor and the sixth resistor are respectively grounded. First electric capacity, second electric capacity, first resistance, second resistance and third resistance, third electric capacity, fourth resistance, fifth resistance and sixth resistance, the partial pressure transmission relies on the feedback voltage of gathering jointly to the feedback end of first step-down module and the feedback of second step-down module respectively, the feedback voltage value that first step-down module and second step-down module acquireed is the same, be convenient for its internal circuit automatically regulated and make output voltage stable.
Further, the first frequency loop compensation module comprises a fifth capacitor, a sixth capacitor and a seventh resistor, the fifth capacitor is connected in series with the seventh resistor, and the sixth capacitor is connected in parallel with a series circuit formed by the fifth capacitor and the seventh resistor; the second frequency loop compensation module comprises a seventh capacitor, an eighth capacitor and an eighth resistor, wherein the seventh capacitor is connected with the eighth resistor in series, and the eighth capacitor is connected with a series circuit formed by the seventh capacitor and the eighth resistor in parallel. The fifth capacitor, the sixth capacitor and the seventh resistor, and the seventh capacitor, the eighth capacitor and the eighth resistor are respectively connected to the compensation end of the first voltage reduction module and the compensation end of the second voltage reduction module, so that the gain of the circuit can be automatically adjusted along with the drift of the output current, errors can be eliminated, and the precision of the output voltage is improved.
Further, the type of the buck power supply chip is C6858. The voltage reduction circuit is used for reducing voltage of the power supply module.
Adopt above-mentioned scheme, the beneficial effects of the utility model are that: the utility model discloses a design a step-down circuit, by two sets of the same step-down circuit parallel connection use to realize that the output adds and shares load current jointly with two sets of chip output current, makes step-down power supply chip operation more stable, efficiency is higher. And the utility model discloses the feedback voltage of parallel connection's common collection, the feedback voltage value that two chips acquireed is the same, and chip internal circuit automatically regulated makes output voltage stable.
Drawings
Fig. 1 is a block diagram of the structure of the embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an embodiment of the present invention.
Wherein the figures identify the description:
1. a first voltage reduction module; 2. a second voltage reduction module; 3. a power supply module; 4. an output module; 5. a first feedback module; 6. a second feedback module; 7. a first frequency loop compensation module; 8. a second frequency loop compensation module; 9. a first filtering module; 10. a second filtering module; 11. a third filtering module; 12. and a fourth filtering module.
Detailed Description
Exemplary embodiments that embody features and advantages of the present invention will be described in detail in the following description. It is to be understood that the invention is capable of other and different embodiments and its several details are capable of modification without departing from the scope of the invention, and that the description and drawings are to be regarded as illustrative in nature and not as restrictive.
In the description of the present invention, it is to be understood that the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present invention, it is to be noted that, unless otherwise specified or limited, the term "connected" means that the elements related to the present invention are electrically connected according to their inherent characteristics and their logical relationship of schemes for realizing the technical purpose of the present invention, and may be either directly connected to each other to form an electrical connection relationship or indirectly connected to each other through an intermediate medium. The specific meaning of each term in the present application document in the present invention can be understood according to specific situations by those skilled in the art.
As shown in fig. 1, a voltage-reducing circuit includes a first voltage-reducing module 1, a second voltage-reducing module 2, a power module 3 and an output module 4, wherein an input terminal of the first voltage-reducing module 1 and an input terminal of the second voltage-reducing module 2 are connected in parallel to an output terminal of the power module 3, an output terminal of the first voltage-reducing module 1 and an output terminal of the second voltage-reducing module 2 are connected in parallel to an input terminal of the output module 4, the first voltage-reducing module 1 and the second voltage-reducing module 2 are configured to reduce a voltage of the power module and output the voltage to the output module 4, a first inductor L101 and the cathode of a first diode D101 are connected between the output end of the first voltage reduction module 1 and the input end of the output module 4, the anode of the first diode D101 is grounded, a second inductor L201 and the cathode of a second diode D201 are connected between the output end of the second voltage reduction module 2 and the input end of the output module 4, and the anode of the second diode D201 is grounded; the frequency synthesizer further comprises a first feedback module 5, a second feedback module 6, a first frequency loop compensation module 7 and a second frequency loop compensation module 8, wherein: the input end of the first feedback module 5 is connected with the output end of the first voltage reduction module 1, and the output end of the first feedback module is respectively connected with the feedback end of the first voltage reduction module 1 and the feedback end of the second voltage reduction module 2, so that the output voltage of the first voltage reduction module 1 is fed back to the first voltage reduction module 1 and the second voltage reduction module 2; the input end of the second feedback module 6 is connected with the output end of the second voltage reduction module 2, and the output end of the second feedback module is respectively connected with the feedback end of the first voltage reduction module 1 and the feedback end of the second voltage reduction module 2 and used for feeding back the output voltage of the second voltage reduction module 2 to the first voltage reduction module 1 and the second voltage reduction module 2; the first frequency loop compensation module 7 is respectively connected with the frequency loop compensation ends of the first voltage reduction module 1 and the second voltage reduction module 2 and is used for adjusting the output current drift of the first voltage reduction module 1 and the second voltage reduction module 2; and the second frequency loop compensation module 8 is respectively connected with the frequency loop compensation ends of the first voltage reduction module 1 and the second voltage reduction module 2 and used for adjusting the output current drift of the first voltage reduction module 1 and the second voltage reduction module 2, and the first voltage reduction module 1 and the second voltage reduction module 2 comprise the same voltage reduction power supply chip.
As shown in fig. 2, wherein the output voltage range of the power module 3 is 12-60V, specifically, the output voltage of the power module 3 is 24V, the first voltage-reducing module 1 is a first voltage-reducing power chip U101, and the second voltage-reducing module 2 is a second voltage-reducing power chip U201, exemplarily, the types of the voltage-reducing power chip U101 of the first voltage-reducing module 1 and the voltage-reducing power chip U201 of the second voltage-reducing module 2 may be C6858, and are configured to reduce the 24V output by the power module 3 to 12V, and respectively superimpose and input the output 5A current into the output module 4, so that the output module 4 can receive the current of 10A.
As shown in fig. 2, in an embodiment, the apparatus further includes a first filtering module 9, a second filtering module 10, a third filtering module 11, and a fourth filtering module 12, where the first filtering module 9, the second filtering module 10, the third filtering module 11, and the fourth filtering module 12 are all formed by connecting a plurality of capacitors in parallel, specifically, the first filtering module 9 includes 6 capacitors including capacitors C101 to C106, the second filtering module 10 includes 6 capacitors including capacitors C201 to C206, the third filtering module 11 includes 6 capacitors including capacitors C113 to C118, and the fourth filtering module 12 includes 6 capacitors including capacitors C213 to C218, where: the first filtering module 9 is connected between the input end of the first voltage reduction module 1 and the output end of the power supply module 3, and the first filtering module 9 is grounded; the second filtering module 10 is connected between the input end of the second voltage reduction module 2 and the output end of the power supply module 3, and the second filtering module 10 is grounded; the third filtering module 11 is connected between the output end of the first voltage reduction module 1 and the input end of the output module, and the third filtering module 11 is grounded; the fourth filtering module 12 is connected between the output end of the second voltage-reducing module 2 and the input end of the output module, and the fourth filtering module 12 is grounded.
Wherein, the output clutter of power module 3 is filtered to first filtering module 9 and second filtering module 10 for power module 3 output purifies and stabilizes, and the output clutter of first step-down module 1 and second step-down module 2 is filtered respectively to third filtering module 11 and fourth filtering module 12, makes the output of first step-down module 1 and second step-down module 2 stable.
The third filtering module 11 is connected between the output end of the first inductor and the input end of the first feedback module 5, and the fourth filtering module 12 is connected between the second inductor L201 and the second feedback module 6.
The first filtering module 9, the second filtering module 10, the third filtering module 11 and the fourth filtering module 12 are respectively formed by connecting a plurality of capacitors with different magnitudes in parallel. For an actual capacitive element, due to the lead and the PCB wiring, the capacitive element is actually a series connection of an inductor and a capacitor and a resistor, the impedance of the inductor is increased along with the increase of the frequency value, the impedance of the capacitor is reduced along with the increase of the frequency, and the capacitors with different magnitudes are connected in series, so that the large capacitor filters low frequency waves, and the small capacitor filters high frequency waves.
With reference to fig. 2, the first feedback module 5 includes a first capacitor C119, a second capacitor C120, a first resistor R106, a second resistor R107, and a third resistor R108, wherein the first resistor R106 and the second resistor R107 have different resistances, the first resistor R106 and the second resistor R107 are connected in series, and the first capacitor C119, the first resistor R106 and the second resistor R107 form a parallel circuit, wherein: the input end of a parallel circuit consisting of a first capacitor C119, a first resistor R106 and a second resistor R107 is connected with the output end of the first voltage reduction module 1, the output end of the parallel circuit is respectively connected with the feedback end of the first voltage reduction module 1, the feedback end of the second voltage reduction module 2, a second capacitor C120 and a third resistor R108, and the second capacitor C120 and the third resistor R108 are respectively grounded; the second feedback module 6 includes a third capacitor C219, a fourth capacitor C220, a fourth resistor R206, a fifth resistor R207, and a sixth resistor R208, the fourth resistor R206 and the fifth resistor R207 have different resistances, the fourth resistor R206 and the fifth resistor R207 are connected in series, the third capacitor C219, the fourth resistor R206, and the fifth resistor R207 form a parallel circuit, wherein: the input end of a parallel circuit composed of a third capacitor C219, a fourth resistor R206 and a fifth resistor R207 is connected with the output end of the second voltage-reducing module 2, the output end is respectively connected with the feedback end of the first voltage-reducing module 1, the feedback end of the second voltage-reducing module 2, a fourth capacitor C220 and a sixth resistor R208, and the fourth capacitor C220 and the sixth resistor R208 are respectively grounded. The first capacitor C119, the second capacitor C120, the first resistor R106, the second resistor R107 and the third resistor R108, the third capacitor C219, the fourth capacitor C220, the fourth resistor R206, the fifth resistor R207 and the sixth resistor R208 are respectively used for transmitting the feedback voltage which is jointly acquired by the feedback end of the first voltage reduction module 1 and the feedback end of the second voltage reduction module 2 in a voltage division manner, and the feedback voltage values acquired by the first voltage reduction module 1 and the second voltage reduction module 2 are the same, so that the internal circuit of the first voltage reduction module can be automatically adjusted to enable the output voltage to be stable.
With reference to fig. 2, in an embodiment, the first frequency loop compensation module 7 includes a fifth capacitor C110, a sixth capacitor C111 and a seventh resistor R104, the fifth capacitor C110 is connected in series with the seventh resistor R104, and the sixth capacitor C111 is connected in parallel with a series circuit formed by the fifth capacitor C110 and the seventh resistor R104; the second frequency loop compensation module 8 includes a seventh capacitor C210, an eighth capacitor C211, and an eighth resistor R204, where the seventh capacitor C210 is connected in series with the eighth resistor R204, and the eighth capacitor C211 is connected in parallel with a series circuit formed by the seventh capacitor C210 and the eighth resistor R204. The fifth capacitor C110, the sixth capacitor C111, the seventh resistor R104, the seventh capacitor C210, the eighth capacitor C211, and the eighth resistor R204 are respectively connected to the compensation end of the first voltage-reducing module 1 and the compensation end of the second voltage-reducing module 2, so that the gain of the circuit can be automatically adjusted along with the drift of the output current, thereby eliminating errors and improving the precision of the output voltage.
In the implementation, through designing a step-down circuit, by two sets of the same step-down circuit parallel connection use to realize that the output adds and shares load current jointly with two sets of chip output currents, make step-down power supply chip operation more stable, efficiency is higher. And the utility model discloses the feedback voltage of parallel connection's common collection, the feedback voltage value that two step-down power supply chips acquireed is the same, and step-down power supply chip internal circuit automatically regulated makes output voltage stable, need not set up special feedback control unit and adjusts work that just can be automatic, makes two chip current output end superposes and obtains double current.
Wherein, when in operation the utility model discloses the time, the step-down power chip U101 of first step-down module 1 and the step-down power chip U201 of second step-down module 2 all adopt C6858 chip, power module 3 exports 24V signal, the step-down power chip U101 of first step-down module 1 and the step-down power chip U201 output current of second step-down module 2 are 5A respectively, and two step-down power chips output current's superposition sum equals 10A after connecting in parallel, the step-down power chip U101 input of first step-down module 1 is connected with the step-down power chip U201 input of second step-down module 2, make input voltage synchronous, inductance L101 that the step-down power chip U101 output end of first step-down module 1 is connected with the inductance L201 of the step-down power chip U201 output end of second step-down module 2, make output voltage synchronous;
when the voltage-reducing power supply chip operates, the voltage-reducing power supply chip U101 fed back to the first voltage-reducing module 1 by the first feedback module 5 and the voltage-reducing power supply chip U201 fed back to the second voltage-reducing module 2 by the second feedback module 6 have the same feedback voltage value, so that the internal circuit of the corresponding voltage-reducing power supply chip automatically adjusts to enable the output voltage to be stable, and particularly, the chip has the function of automatically adjusting the voltage; the first frequency loop compensation module and the second frequency loop compensation module are respectively connected to the compensation ends of the buck power chip U101 of the first buck module 1 and the buck power chip U201 of the second buck module 2, so that the gain of the circuit can be automatically adjusted along with the drift of the output current, errors can be eliminated, and the precision of the output voltage is improved.
While the present disclosure has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present disclosure may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (7)
1. A voltage reduction circuit is characterized by comprising a first voltage reduction module, a second voltage reduction module, a power module and an output module, wherein the input end of the first voltage reduction module and the input end of the second voltage reduction module are connected in parallel at the output end of the power module, the output end of the first voltage reduction module and the output end of the second voltage reduction module are connected in parallel at the input end of the output module, the first voltage reduction module and the second voltage reduction module are used for reducing the voltage of the power module and then outputting the voltage to the output module, a first inductor and the negative electrode of a first diode are connected between the output end of the first voltage reduction module and the input end of the output module, the positive electrode of the first diode is grounded, a second inductor and the negative electrode of a second diode are connected between the output end of the second voltage reduction module and the input end of the output module, the anode of the second diode is grounded, and the first voltage reduction module and the second voltage reduction module comprise the same voltage reduction power supply chip;
still include first feedback module, second feedback module, first frequency loop compensation module and second frequency loop compensation module, wherein:
the input end of the first feedback module is connected with the output end of the first voltage reduction module, and the output end of the first feedback module is respectively connected with the feedback end of the first voltage reduction module and the feedback end of the second voltage reduction module and is used for feeding back the output voltage of the first voltage reduction module to the first voltage reduction module and the second voltage reduction module;
the input end of the second feedback module is connected with the output end of the second voltage reduction module, and the output end of the second feedback module is respectively connected with the feedback end of the first voltage reduction module and the feedback end of the second voltage reduction module and used for feeding back the output voltage of the second voltage reduction module to the first voltage reduction module and the second voltage reduction module;
the first frequency loop compensation module is respectively connected with the frequency loop compensation ends of the first voltage reduction module and the second voltage reduction module and is used for adjusting the output current drift of the first voltage reduction module and the second voltage reduction module;
the second frequency loop compensation module is respectively connected with the frequency loop compensation ends of the first voltage reduction module and the second voltage reduction module, and is used for adjusting the output current drift of the first voltage reduction module and the second voltage reduction module.
2. The buck circuit according to claim 1, further comprising a first filtering module, a second filtering module, a third filtering module, and a fourth filtering module, wherein the first filtering module, the second filtering module, the third filtering module, and the fourth filtering module are each formed by a plurality of capacitors connected in parallel, and wherein:
the first filtering module is connected between the input end of the first voltage reduction module and the output end of the power supply module, and the first filtering module is grounded;
the second filtering module is connected between the input end of the second voltage reduction module and the output end of the power supply module, and the second filtering module is grounded;
the third filtering module is connected between the output end of the first voltage reduction module and the input end of the output module, and the third filtering module is grounded;
the fourth filtering module is connected between the output end of the second voltage reduction module and the input end of the output module, and the fourth filtering module is grounded.
3. The buck circuit according to claim 2, wherein the third filtering module is coupled between the output of the first inductor and the input of the first feedback module, and the fourth filtering module is coupled between the second inductor and the second feedback module.
4. The buck circuit according to claim 2, wherein the first, second, third and fourth filtering modules are respectively formed by connecting a plurality of capacitors with different magnitudes in parallel.
5. The voltage reduction circuit according to claim 1, wherein the first feedback module comprises a first capacitor, a second capacitor, a first resistor, a second resistor and a third resistor, the first resistor and the second resistor have different resistances, the first resistor and the second resistor are connected in series, the first capacitor and the first resistor and the second resistor form a parallel circuit, and wherein:
the input end of a parallel circuit consisting of the first capacitor, the first resistor and the second resistor is connected with the output end of the first voltage reduction module, the output end of the parallel circuit is respectively connected with the feedback end of the first voltage reduction module, the feedback end of the second voltage reduction module, the second capacitor and the third resistor, and the second capacitor and the third resistor are respectively grounded;
the second feedback module comprises a third capacitor, a fourth resistor, a fifth resistor and a sixth resistor, the fourth resistor and the fifth resistor have different resistance values, the fourth resistor and the fifth resistor are connected in series, and the third capacitor, the fourth resistor and the fifth resistor form a parallel circuit, wherein:
the input end of a parallel circuit consisting of the third capacitor, the fourth resistor and the fifth resistor is connected with the output end of the second voltage reduction module, the output end of the parallel circuit is respectively connected with the feedback end of the first voltage reduction module, the feedback end of the second voltage reduction module, the fourth capacitor and the sixth resistor, and the fourth capacitor and the sixth resistor are respectively grounded.
6. The voltage reduction circuit according to claim 1, wherein the first frequency loop compensation module comprises a fifth capacitor, a sixth capacitor and a seventh resistor, the fifth capacitor is connected in series with the seventh resistor, and the sixth capacitor is connected in parallel with the series circuit of the fifth capacitor and the seventh resistor;
the second frequency loop compensation module comprises a seventh capacitor, an eighth capacitor and an eighth resistor, wherein the seventh capacitor is connected with the eighth resistor in series, and the eighth capacitor is connected with a series circuit formed by the seventh capacitor and the eighth resistor in parallel.
7. The buck circuit according to claim 6, wherein the buck power chip is of type C6858.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121465606.4U CN215300487U (en) | 2021-06-29 | 2021-06-29 | Voltage reduction circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121465606.4U CN215300487U (en) | 2021-06-29 | 2021-06-29 | Voltage reduction circuit |
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| CN215300487U true CN215300487U (en) | 2021-12-24 |
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| CN202121465606.4U Active CN215300487U (en) | 2021-06-29 | 2021-06-29 | Voltage reduction circuit |
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