CN219018676U - Voltage conversion circuit and electronic equipment - Google Patents
Voltage conversion circuit and electronic equipment Download PDFInfo
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- CN219018676U CN219018676U CN202223435835.9U CN202223435835U CN219018676U CN 219018676 U CN219018676 U CN 219018676U CN 202223435835 U CN202223435835 U CN 202223435835U CN 219018676 U CN219018676 U CN 219018676U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The application provides a voltage conversion circuit and electronic equipment, wherein the voltage conversion circuit comprises a common mode filtering module, a first voltage value and a second voltage value, wherein the common mode filtering module is configured to acquire an input voltage of a first voltage value and perform common mode filtering on the input voltage; a voltage conversion module configured to convert the common-mode filtered input voltage into an output voltage of a second voltage value; and the differential mode filtering module is configured to perform differential mode filtering on the output voltage and output the output voltage. According to the voltage conversion circuit, direct current-direct current voltage conversion is realized through the voltage conversion module, common mode filtering is carried out on input voltage before voltage conversion through the common mode filtering module, and differential mode filtering is carried out on output voltage after voltage conversion through the differential mode filtering module, so that the voltage conversion circuit can effectively inhibit electromagnetic compatibility at both the input end and the output end, ripple waves are reduced, and the overall stability of the electronic equipment is improved.
Description
Technical Field
The application belongs to the technical field of power supplies, and particularly relates to a voltage conversion circuit and electronic equipment.
Background
Currently, many electronic devices are provided with a Direct Current-Direct Current (DC-DC) conversion circuit for adjusting a voltage value of a Direct voltage. However, the voltage conversion circuit often has an electromagnetic compatibility (EMC, electro Magnetic Compatibility) problem during the voltage conversion process, which affects the overall stability of the electronic device.
The existing voltage conversion circuit generally adopts a filtering structure formed by magnetic beads to inhibit electromagnetic compatibility, but the filtering structure has poor inhibiting effect on electromagnetic compatibility, and particularly for some circuits with small ripple wave requirements, the product requirements cannot be met.
Disclosure of Invention
The utility model provides a voltage conversion circuit and electronic equipment, and aims to solve the problem that an existing voltage conversion circuit is poor in electromagnetic compatibility inhibition effect.
In order to achieve the above object, in a first aspect, an embodiment of the present application provides a voltage conversion circuit, including a common mode filter module, a voltage conversion module, a differential mode filter module, a power input terminal, and a power output terminal;
the voltage conversion module is respectively and electrically connected with the common mode filtering module and the differential mode filtering module;
the common mode filtering module is configured to acquire an input voltage of a first voltage value and perform common mode filtering on the input voltage, the common mode filtering module is further electrically connected with the power input end, and the differential mode filtering module is further electrically connected with the power output end;
the voltage conversion module is configured to convert the input voltage after common mode filtering into an output voltage with a second voltage value;
the differential mode filtering module is configured to perform differential mode filtering on the output voltage and output the output voltage.
In another possible implementation manner of the first aspect, the voltage conversion circuit further includes an absorption module;
the absorption module is electrically connected with the voltage conversion module;
the absorption module is configured to absorb spikes of the output voltage.
In another possible implementation manner of the first aspect, the common mode filtering module includes a first common mode inductance, a first electrolytic capacitor, a second capacitor, and a third capacitor;
the positive pole of first electrolytic capacitor respectively with input voltage with the first input of first common mode inductance is electric to be connected, the first output of first common mode inductance respectively with the one end of second electric capacity with the one end of third electric capacity is electric to be connected, the negative pole of first electrolytic capacitor the second input of first common mode inductance, the second output of first common mode inductance, the other end of second electric capacity with the other end of third electric capacity all ground connection.
In another possible implementation manner of the first aspect, the voltage conversion module includes a pulse modulation chip, a first diode, and a second inductor;
the input end of the pulse modulation chip is electrically connected with the output end of the common mode filter module, the output end of the pulse modulation chip is electrically connected with the cathode of the first diode and one end of the second inductor respectively, the other end of the second inductor is electrically connected with the differential mode filter module, and the anode of the first diode is grounded.
In another possible implementation manner of the first aspect, the voltage conversion module further includes a first resistor and a fourth capacitor;
one end of the first resistor is electrically connected with a feedback pin of the pulse modulation chip, the other end of the first resistor is electrically connected with one end of the fourth capacitor, and the other end of the fourth capacitor is electrically connected with the other end of the second inductor and the differential mode filter module respectively.
In another possible implementation manner of the first aspect, the voltage conversion module further includes a second resistor and a third resistor;
one end of the second resistor is respectively and electrically connected with the other end of the second inductor and the differential mode filtering module, the other end of the second resistor is respectively connected with the feedback pin of the pulse modulation chip and one end of the third resistor, and the other end of the third resistor is grounded.
In another possible implementation manner of the first aspect, the differential mode filtering module includes a third differential mode inductance, a fifth electrolytic capacitor, a sixth capacitor, and a seventh capacitor;
one end of the third differential mode inductor is electrically connected with the output end of the voltage conversion module, the positive electrode of the fifth electrolytic capacitor and one end of the sixth capacitor respectively, the other end of the third differential mode inductor is electrically connected with one end of the seventh capacitor, and the other end of the fifth electrolytic capacitor, the other end of the sixth capacitor and the other end of the seventh capacitor are grounded.
In another possible implementation manner of the first aspect, the absorption module includes a fourth resistor and an eighth capacitor;
one end of the fourth resistor is electrically connected with the bootstrap boosting pin of the voltage conversion module, the other end of the fourth resistor is electrically connected with one end of the eighth capacitor, and the other end of the eighth capacitor is electrically connected with the output pin of the voltage conversion module.
In another possible implementation manner of the first aspect, the absorption module further includes a fifth resistor and a ninth capacitor;
one end of the fifth resistor is electrically connected with the other end of the eighth capacitor, the other end of the fifth resistor is electrically connected with one end of the ninth capacitor, and the other end of the ninth capacitor is grounded.
In a second aspect, an embodiment of the present application provides an electronic device, including the voltage conversion circuit.
Compared with the prior art, the embodiment of the application has the beneficial effects that: according to the voltage conversion circuit, direct current-direct current voltage conversion is realized through the voltage conversion module, common mode filtering is carried out on input voltage before voltage conversion through the common mode filtering module, and differential mode filtering is carried out on output voltage after voltage conversion through the differential mode filtering module, so that the voltage conversion circuit can effectively inhibit electromagnetic compatibility at both the input end and the output end, ripple waves are reduced, and overall stability of electronic equipment is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following description will briefly introduce the drawings that are needed in the embodiments or the description of the prior art, it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a circuit diagram of a conventional voltage conversion circuit;
fig. 2 is a schematic structural diagram of a voltage conversion circuit according to an embodiment of the present disclosure;
fig. 3 is a circuit diagram of a voltage conversion circuit according to an embodiment of the present disclosure;
FIG. 4 is a diagram showing an output waveform of a conventional voltage converting circuit;
fig. 5 is an output waveform diagram of the voltage conversion circuit according to the embodiment of the present application;
FIG. 6 is a ripple waveform diagram of a conventional voltage conversion circuit;
fig. 7 is a ripple waveform diagram of a voltage conversion circuit according to an embodiment of the present application.
Reference numerals illustrate:
the device comprises a 1-common mode filter module, a 2-voltage conversion module, a 3-differential mode filter module and a 4-absorption module.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality of" means two or more, unless specifically defined otherwise.
The voltage conversion circuit in the conventional electronic device is generally a buck chopper circuit, and, for example, fig. 1 is a circuit diagram of the conventional voltage conversion circuit, and as shown in fig. 1, the buck chopper circuit specifically includes a first triode Q1, a first inductor L1, a first diode D1, a first electrolytic capacitor C1, a second electrolytic capacitor C2, and a first resistor R1; the collector of the first triode Q1 is electrically connected with the positive electrode of the first electrolytic capacitor C1, the emitter of the first triode Q1 is electrically connected with one end of the first inductor L1 and the negative electrode of the first diode D1 respectively, the other end of the first inductor L1 is electrically connected with the positive electrode of the second electrolytic capacitor C2 and one end of the first resistor R1 respectively, and the positive electrode of the first diode D1 is electrically connected with the negative electrode of the first electrolytic capacitor C1, the negative electrode of the second electrolytic capacitor C2 and the other end of the first resistor R1 respectively.
In the conventional voltage conversion circuit, the input voltage is filtered by the first electrolytic capacitor C1, and the first resistor R1 serves as a load resistor. When the first triode Q1 is conducted, energy is stored and electricity is stored through the first inductor L1 and the second electrolytic capacitor C2, and power is supplied to the first resistor R1; when the first triode Q1 is disconnected, power is supplied to the first resistor R1 through discharge of the first inductor L1 and the second electrolytic capacitor C2. The traditional voltage conversion circuit generally has serious electromagnetic compatibility problem, can interfere the operation of the back-end circuit connected with the converted output voltage, and can influence the control precision of the back-end circuit even stop the back-end circuit. Electromagnetic compatibility, among others, includes electromagnetic interference (EMI, electro-Magnetic Interference) and electromagnetic sensitivity (EMS, electro-Magnetic Susceptibility), affecting the stability of the conversion circuit.
Therefore, the application provides a voltage conversion circuit, which performs common mode filtering on the input voltage of the voltage conversion circuit and differential mode filtering on the output voltage of the voltage conversion circuit, so that the voltage conversion circuit can effectively inhibit electromagnetic compatibility at both the input end and the output end, reduce ripple waves and improve the overall stability of electronic equipment.
The voltage conversion circuit provided in the present application is described below by way of example with reference to the accompanying drawings.
Fig. 2 is a schematic structural diagram of a voltage conversion circuit according to an embodiment of the present application. As shown in fig. 2, illustratively, a voltage conversion circuit 100 includes a common mode filter module 1, a voltage conversion module 2, and a differential mode filter module 3, a power supply input terminal 11, and a power supply output terminal 31; the voltage conversion module 2 is electrically connected with the common mode filter module 1 and the differential mode filter module 3 respectively, the common mode filter module 1 is also electrically connected with the power input end 11, and the differential mode filter module 3 is also electrically connected with the power output end 31.
The common mode filtering module 1 is configured to acquire an input voltage of a first voltage value and perform common mode filtering on the input voltage.
The voltage conversion module 2 is configured to convert the input voltage after common mode filtering into an output voltage of a second voltage value.
The differential mode filtering module 3 is configured to perform differential mode filtering on the output voltage and output the output voltage.
In this embodiment of the present application, when direct current voltage conversion is required, the common mode filter module 1 is connected to the power input terminal 11 to obtain an input voltage of a first voltage value, and performs common mode filtering on the input voltage, so as to suppress electromagnetic compatibility brought by the input terminal and reduce ripple. And then the voltage conversion module 2 is utilized to convert the input voltage after common mode filtering into the output voltage with the second voltage value, so as to realize the DC-DC voltage conversion process. Finally, the differential mode filtering module 3 performs differential mode filtering on the output voltage of the second voltage value, and outputs the output voltage through the power output end 31, so that electromagnetic compatibility brought by the output end is restrained, and ripple waves are reduced.
In one embodiment of the present application, as shown in fig. 2, the voltage conversion circuit 100 further includes an absorption module 4, illustratively; the absorption module 4 is electrically connected with the voltage conversion module 2.
The absorption module 4 is configured to absorb spikes of the output voltage.
In the embodiment of the application, the absorption module 4 is used for absorbing the spike pulse of the output voltage, and the electromagnetic compatibility in the output voltage can be restrained, so that the stability and the reliability of the output voltage are further improved.
In one embodiment of the present application, fig. 3 is a circuit diagram of a voltage conversion circuit provided in an embodiment of the present application. As shown in fig. 3, the common mode filter module 1 includes, illustratively, a first common mode inductance L1, a first electrolytic capacitor C1, a second capacitor C2, and a third capacitor C3.
The positive pole of first electrolytic capacitor C1 is connected with input voltage and the first input of first common mode inductance L1 respectively, and first output of first common mode inductance L1 is connected with one end of second electric capacity C2 and one end of third electric capacity C3 respectively, and the negative pole of first electrolytic capacitor C1, the second input of first common mode inductance L1, the second output of first common mode inductance L1, the other end of second electric capacity C2 and the other end of third electric capacity C3 all ground connection.
In the embodiment of the application, the common-mode filter circuit is formed by the first common-mode inductor L1, the first electrolytic capacitor C1, the second capacitor C2 and the third capacitor C3, and common-mode signals in input voltage are filtered, so that the electromagnetic compatibility problem is effectively restrained, and the ripple effect is optimized. The model of the first common-mode inductor L1 is CSTP1260-701.
In one embodiment of the present application, as shown in fig. 3, the voltage conversion module 2 includes, illustratively, a pulse modulation chip U1, a first diode D1, and a second inductor L2.
The input end of the pulse modulation chip U1 is electrically connected with the output end of the common mode filter module 1, the output end of the pulse modulation chip U1 is respectively electrically connected with the cathode of the first diode D1 and one end of the second inductor L2, the other end of the second inductor L2 is electrically connected with the differential mode filter module 3, and the anode of the first diode D1 is grounded.
In the embodiment of the application, the pulse modulation chip U1, the first diode D1 and the second inductor L2 form a voltage chopper circuit together, the direct-current voltage is chopped into square waves, and the magnitude of the voltage value is changed by adjusting the duty ratio (namely the ratio of the pulse width to the pulse period) of the square waves. The type of the pulse modulation chip U1 can be MP9487 series, LMR160 series or STC26 series.
In one embodiment of the present application, as shown in fig. 3, the voltage conversion module 2 further includes a first resistor R1 and a fourth capacitor C4, for example.
One end of the first resistor R1 is electrically connected with a feedback pin of the pulse modulation chip U1, the other end of the first resistor R1 is electrically connected with one end of the fourth capacitor C4, and the other end of the fourth capacitor C4 is electrically connected with the other end of the second inductor L2 and the differential mode filter module 3 respectively.
In the embodiment of the application, the output voltage of the pulse modulation chip U1 is filtered by forming an RC filter circuit by the first resistor R1 and the fourth capacitor C4.
In one embodiment of the present application, as shown in fig. 3, the voltage conversion module 2 further includes a second resistor R2 and a third resistor R3, by way of example.
One end of the second resistor R2 is respectively and electrically connected with the other end of the second inductor L2 and the differential mode filter module 3, the other end of the second resistor R2 is respectively connected with a feedback pin of the pulse modulation chip U1 and one end of the third resistor R3, and the other end of the third resistor R3 is grounded.
In the embodiment of the application, the voltage feedback circuit is formed by the second resistor R2 and the third resistor R3, so that the pulse modulation chip U1 can output more stable voltage.
In one embodiment of the present application, as shown in fig. 3, the differential mode filtering module 3 includes, illustratively, a third differential mode inductance L3, a fifth electrolytic capacitor C5, a sixth capacitor C6, and a seventh capacitor C7.
One end of the third differential-mode inductor L3 is electrically connected with the output end of the voltage conversion module 2, the positive electrode of the fifth electrolytic capacitor C5 and one end of the sixth capacitor C6 respectively, the other end of the third differential-mode inductor L3 is electrically connected with one end of the seventh capacitor C7, and the other end of the fifth electrolytic capacitor C5, the other end of the sixth capacitor C6 and the other end of the seventh capacitor C7 are grounded.
In the embodiment of the application, the third differential mode inductor L3, the fifth electrolytic capacitor C5, the sixth capacitor C6 and the seventh capacitor C7 form a differential mode filter circuit, which is used for reducing differential mode interference in the output voltage of the DC-DC conversion circuit, reducing electromagnetic compatibility and optimizing ripple waves.
In one embodiment of the present application, as shown in fig. 3, the absorption module 4 includes, illustratively, a fourth resistor R4 and an eighth capacitor C8.
One end of the fourth resistor R4 is electrically connected with the bootstrap boosting pin of the voltage conversion module 2, the other end of the fourth resistor R4 is electrically connected with one end of the eighth capacitor C8, and the other end of the eighth capacitor C8 is electrically connected with the output pin of the voltage conversion module 2.
In the embodiment of the application, the boost regulation is performed on the bootstrap boost pin of the pulse modulation chip U1 through the fourth resistor R4 and the eighth capacitor C8.
Illustratively, as shown in fig. 3, the absorption module 4 further includes a fifth resistor R5 and a ninth capacitor C9.
One end of the fifth resistor R5 is electrically connected to the other end of the eighth capacitor C8, the other end of the fifth resistor R5 is electrically connected to one end of the ninth capacitor C9, and the other end of the ninth capacitor C9 is grounded.
In the embodiment of the application, the fifth resistor R5 and the ninth capacitor C9 form an absorption circuit to inhibit the spike pulse of the output voltage of the pulse modulation chip U1, so that the spike pulse tends to be smooth, electromagnetic compatibility is reduced, and ripple waves are reduced.
In one embodiment of the present application, fig. 4 is an output waveform diagram of a conventional voltage conversion circuit; fig. 5 is an output waveform diagram of the voltage conversion circuit according to the embodiment of the present application. The test data of the international coordination standard EN55032CLASS B is used as a quantitative reference, and M2 is used as a comparison point of test results of the voltage conversion circuit and the traditional voltage conversion circuit. As shown in fig. 4, in the conventional voltage conversion circuit, the frequency point of M2 is around 52Mhz, and the margin exceeding the limit value is 1.35dB, which does not meet the requirements of the EN55032CLASS B standard. As shown in fig. 5, in the voltage conversion circuit of the present application, the frequency point of M2 is around 52Mhz, and the margin exceeding the limit value is-8.22 dB. Compared with the traditional voltage conversion circuit, the margin optimization gap of the voltage conversion circuit is 9.57dB, so that the voltage conversion circuit has an obvious optimization effect.
In one embodiment of the present application, fig. 6 is a ripple waveform diagram of a conventional voltage conversion circuit; fig. 7 is a ripple waveform diagram of a voltage conversion circuit according to an embodiment of the present application. As shown in fig. 6, the input ripple measured by the conventional voltage conversion circuit is 172mV, which is not enough for some electronic devices with high ripple requirements. As shown in FIG. 7, the oscilloscopes measure at the same position, the input ripple wave measured by the voltage conversion circuit is 14.0mV, the difference between the front result and the back result is 10 times more, the ripple wave improvement effect is obvious, and better power quality is brought to the electronic equipment.
Illustratively, embodiments of the present application provide an electronic device that includes a voltage conversion circuit 100.
In this embodiment of the present application, the voltage conversion circuit 100 may be installed inside an electronic device, where the voltage conversion circuit 100 implements dc-dc voltage conversion through the voltage conversion module 2, performs common mode filtering on an input voltage before voltage conversion through the common mode filtering module 1, and performs differential mode filtering on an output voltage after voltage conversion through the differential mode filtering module 3, so that the voltage conversion circuit 100 can effectively inhibit electromagnetic compatibility at both an input end and an output end, optimize ripple, and improve stability and reliability of the electronic device as a whole.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic of each process, and should not limit the implementation process of the embodiment of the present application in any way.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the electronic device may refer to the corresponding process in the foregoing embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the elements of the examples described in connection with the embodiments disclosed herein can be implemented as electronic hardware, or as a combination of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed voltage conversion circuit may be implemented in other manners. For example, the above-described voltage conversion circuit embodiments are merely illustrative, e.g., the division of modules or units is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another electronic device, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via a number of multi-interface electronic devices, apparatuses or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. The voltage conversion circuit is characterized by comprising a common mode filter module (1), a voltage conversion module (2), a differential mode filter module (3), a power input end (11) and a power output end (31);
the voltage conversion module (2) is respectively and electrically connected with the common mode filtering module (1) and the differential mode filtering module (3), the common mode filtering module (1) is also electrically connected with the power input end (11), and the differential mode filtering module (3) is also electrically connected with the power output end (31);
the common mode filtering module (1) is configured to acquire an input voltage of a first voltage value and perform common mode filtering on the input voltage;
-the voltage conversion module (2) configured to convert the common-mode filtered input voltage into an output voltage of a second voltage value;
the differential mode filtering module (3) is configured to perform differential mode filtering on the output voltage and output the output voltage.
2. The voltage conversion circuit according to claim 1, characterized in that it further comprises an absorption module (4);
the absorption module (4) is electrically connected with the voltage conversion module (2);
the absorption module (4) is configured to absorb spikes of the output voltage.
3. The voltage conversion circuit according to claim 1 or 2, characterized in that the common mode filter module (1) comprises a first common mode inductance (L1), a first electrolytic capacitance (C1), a second capacitance (C2) and a third capacitance (C3);
the positive pole of first electrolytic capacitor (C1) respectively with input voltage with the first input of first common mode inductance (L1) electricity is connected, the first output of first common mode inductance (L1) respectively with one end of second electric capacity (C2) with one end electricity of third electric capacity (C3) is connected, the negative pole of first electrolytic capacitor (C1) the second input of first common mode inductance (L1), the second output of first common mode inductance (L1), the other end of second electric capacity (C2) and the other end of third electric capacity (C3) all ground connection.
4. The voltage conversion circuit according to claim 1 or 2, characterized in that the voltage conversion module (2) comprises a pulse modulation chip (U1), a first diode (D1) and a second inductance (L2);
the input end of the pulse modulation chip (U1) is electrically connected with the output end of the common mode filter module (1), the output end of the pulse modulation chip (U1) is electrically connected with the cathode of the first diode (D1) and one end of the second inductor (L2) respectively, the other end of the second inductor (L2) is electrically connected with the differential mode filter module (3), and the anode of the first diode (D1) is grounded.
5. The voltage conversion circuit according to claim 4, wherein the voltage conversion module (2) further comprises a first resistor (R1) and a fourth capacitor (C4);
one end of the first resistor (R1) is electrically connected with a feedback pin of the pulse modulation chip (U1), the other end of the first resistor (R1) is electrically connected with one end of the fourth capacitor (C4), and the other end of the fourth capacitor (C4) is electrically connected with the other end of the second inductor (L2) and the differential mode filter module (3) respectively.
6. The voltage conversion circuit according to claim 4, wherein the voltage conversion module (2) further comprises a second resistor (R2) and a third resistor (R3);
one end of the second resistor (R2) is respectively and electrically connected with the other end of the second inductor (L2) and the differential mode filtering module (3), the other end of the second resistor (R2) is respectively connected with a feedback pin of the pulse modulation chip (U1) and one end of the third resistor (R3), and the other end of the third resistor (R3) is grounded.
7. The voltage conversion circuit according to claim 1 or 2, characterized in that the differential mode filter module (3) comprises a third differential mode inductance (L3), a fifth electrolytic capacitance (C5), a sixth capacitance (C6) and a seventh capacitance (C7);
one end of the third differential mode inductor (L3) is electrically connected with the output end of the voltage conversion module (2), the positive electrode of the fifth electrolytic capacitor (C5) and one end of the sixth capacitor (C6), the other end of the third differential mode inductor (L3) is electrically connected with one end of the seventh capacitor (C7), and the other end of the fifth electrolytic capacitor (C5), the other end of the sixth capacitor (C6) and the other end of the seventh capacitor (C7) are grounded.
8. A voltage conversion circuit according to claim 2, characterized in that the absorption module (4) comprises a fourth resistor (R4) and an eighth capacitor (C8);
one end of the fourth resistor (R4) is electrically connected with a bootstrap boosting pin of the voltage conversion module (2), the other end of the fourth resistor (R4) is electrically connected with one end of the eighth capacitor (C8), and the other end of the eighth capacitor (C8) is electrically connected with an output pin of the voltage conversion module (2).
9. The voltage conversion circuit according to claim 8, characterized in that the absorption module (4) further comprises a fifth resistor (R5) and a ninth capacitor (C9);
one end of the fifth resistor (R5) is electrically connected with the other end of the eighth capacitor (C8), the other end of the fifth resistor (R5) is electrically connected with one end of the ninth capacitor (C9), and the other end of the ninth capacitor (C9) is grounded.
10. An electronic device comprising a voltage conversion circuit according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223435835.9U CN219018676U (en) | 2022-12-20 | 2022-12-20 | Voltage conversion circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223435835.9U CN219018676U (en) | 2022-12-20 | 2022-12-20 | Voltage conversion circuit and electronic equipment |
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| CN219018676U true CN219018676U (en) | 2023-05-12 |
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| CN202223435835.9U Active CN219018676U (en) | 2022-12-20 | 2022-12-20 | Voltage conversion circuit and electronic equipment |
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Address after: 518000 floor 2-4, building 21, Longjun Industrial Zone, Jiuwo, Longping community, Dalang street, Longhua District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Aitushi Innovation Technology Co.,Ltd. Address before: 518000 floor 2-4, building 21, Longjun Industrial Zone, Jiuwo, Longping community, Dalang street, Longhua District, Shenzhen City, Guangdong Province Patentee before: APUTURE IMAGING INDUSTRIES Co.,Ltd. |
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