CN117013812A - High-efficiency low-noise power supply circuit and power supply device - Google Patents

High-efficiency low-noise power supply circuit and power supply device Download PDF

Info

Publication number
CN117013812A
CN117013812A CN202310952444.4A CN202310952444A CN117013812A CN 117013812 A CN117013812 A CN 117013812A CN 202310952444 A CN202310952444 A CN 202310952444A CN 117013812 A CN117013812 A CN 117013812A
Authority
CN
China
Prior art keywords
circuit
power supply
linear
output
output end
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310952444.4A
Other languages
Chinese (zh)
Inventor
请求不公布姓名
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunan Ngi Observation And Control Technology Co ltd
Original Assignee
Hunan Ngi Observation And Control Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hunan Ngi Observation And Control Technology Co ltd filed Critical Hunan Ngi Observation And Control Technology Co ltd
Priority to CN202310952444.4A priority Critical patent/CN117013812A/en
Publication of CN117013812A publication Critical patent/CN117013812A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • H02M1/15—Arrangements for reducing ripples from dc input or output using active elements
    • 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
    • H02M3/01—Resonant DC/DC converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H02M7/068—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode mounted on a transformer
    • 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

Landscapes

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

Abstract

The application discloses a high-efficiency low-noise power supply circuit and a power supply device, wherein the circuit comprises an isolation rectifying and filtering circuit, a switch resonance circuit, a linear adjusting circuit and an output terminal, wherein the input end of the switch resonance circuit is connected with the output end of the isolation rectifying and filtering circuit; the input end of the linear adjusting circuit is connected with the output end of the switch resonance circuit, the input end of the linear adjusting circuit is connected with the first feedback end of the switch resonance circuit, the output end of the linear adjusting circuit is connected with the second feedback end of the switch resonance circuit, the input voltage of the linear adjusting circuit is adjusted by the voltage difference input and output by the linear adjusting circuit, and the output end of the linear adjusting circuit is connected with the output terminal. According to the application, the switch resonance circuit is introduced into the linear power supply, and ripple noise generated by the switch resonance circuit can be regulated by the linear regulation circuit, so that the conversion efficiency is improved, and the advantages of low ripple noise and quick response of the linear power supply are maintained.

Description

High-efficiency low-noise power supply circuit and power supply device
Technical Field
The present application relates to the field of power supply devices, and in particular, to a high-efficiency low-noise power supply circuit and a power supply device.
Background
The regulated power supply is an important component of electronic equipment, and the current common regulated power supply can be divided into two main types of linear regulated power supply and switching regulated power supply according to different working states of power regulating tubes.
The power adjusting tube of the linear voltage stabilizing source works in the linear region, generally, the output voltage of the linear voltage stabilizing source is not influenced by the changes of the input voltage or the load current, the linear voltage stabilizing source always takes the output voltage as an adjusting target, and any change can be quickly adjusted back. The power regulating tube of the switching voltage stabilizing source works in a switching state, and the output size is controlled by controlling the switching time and the switching time.
The linear power supply has the advantages that the design is relatively simple, the noise can be very small, and the response speed can be high due to the simple loop. The linear power supply has the defects of high self-dissipation power, extremely low conversion efficiency and poor efficiency as the input and output voltage difference is larger, so that the volume weight and the cost are difficult to control.
The switching power supply solves the problems of heavy and low efficiency of the linear power supply, and the conversion efficiency can be very high without an oversized radiator and transformer, so that the power density is greatly improved. However, the switching power supply has the disadvantage of large ripple noise, and the operating characteristic is that the switching power supply is operated in a switching state, and although the ripple noise and the switching noise can not be completely filtered all the time by means of filtering devices such as LC, for some sensitive circuits, the noise can cause the noise to not work reliably or influence the performance index of the power supply.
Disclosure of Invention
The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the application provides a high-efficiency low-noise power supply circuit and a power supply device, which can solve the problems of low efficiency and large ripple noise of a switching power supply existing in the conventional linear power supply.
A high efficiency low noise power supply circuit according to an embodiment of the first aspect of the present application includes: the input end of the isolation rectifying and filtering circuit is used for being connected with a mains supply, and the output end of the isolation rectifying and filtering circuit is used for outputting a direct-current voltage; the input end of the switch resonance circuit is connected with the output end of the isolation rectifying and filtering circuit; the input end of the linear adjusting circuit is connected with the output end of the switch resonance circuit, the input end of the linear adjusting circuit is connected with the first feedback end of the switch resonance circuit, the output end of the linear adjusting circuit is connected with the second feedback end of the switch resonance circuit, and the input voltage of the linear adjusting circuit is adjusted by the voltage difference input and output by the linear adjusting circuit; and the output end of the linear adjusting circuit is connected with the output terminal for outputting the power supply voltage.
The high-efficiency low-noise power supply circuit according to the embodiment of the first aspect of the application has at least the following beneficial effects:
according to the embodiment of the application, the direct current voltage from alternating current to isolated is realized through the isolated rectifying and filtering circuit, the linear adjusting circuit is used for outputting the stabilized direct current power supply, the switching resonant circuit is arranged between the linear adjusting circuit and the isolated rectifying and filtering circuit, namely, the one-stage switching resonant circuit is added in the conventional linear power supply, so that the conversion efficiency of the linear power supply is greatly improved, the input condition of the switching resonant circuit adopts the voltage difference between the input and the output of the linear adjusting circuit of the later stage, and therefore, the output of the switching resonant circuit can always follow the output change of the linear adjusting circuit of the later stage, so that the voltage drop of the linear adjusting circuit is always constant, the conversion efficiency is improved, and the problem that the output voltages are different and the power is not identical is avoided. According to the application, the switch resonance circuit is introduced into the linear power supply, and ripple noise generated by the switch resonance circuit can be regulated by the linear regulation circuit, so that the conversion efficiency is improved, and the advantages of low ripple noise and quick response of the linear power supply are maintained.
According to some embodiments of the application, the isolation rectifying and filtering circuit comprises a power frequency transformer, a rectifying bridge and a filtering capacitor, wherein the input end of the power frequency transformer is connected with the mains supply, the output end of the power frequency transformer is connected with the input end of the rectifying bridge, and the output end of the rectifying bridge is connected with the input end of the switch resonance circuit through the filtering capacitor.
According to some embodiments of the present application, the switch resonance circuit includes a MOS transistor Q1, a filter inductor L1, a filter capacitor C2, and a comparator AMP1, where an output end of the isolation rectifying filter circuit is connected to a source of the MOS transistor Q1, a drain of the MOS transistor Q1 is connected to one end of the filter inductor L1, another end of the filter inductor L1 is connected to an input end of the linear adjustment circuit, a common end of the filter inductor L1 and the linear adjustment circuit is grounded through the filter capacitor C2, an in-phase end of the comparator AMP1 is used as a first feedback end of the switch resonance circuit and is connected to an input end of the linear adjustment circuit through a resistor R3, an inverting end of the comparator AMP1 is used as a second feedback end of the switch resonance circuit and is connected to an output end of the linear adjustment circuit through a resistor R4, and an output end of the comparator AMP1 is connected to a gate of the MOS transistor Q1 through a resistor R1.
According to some embodiments of the application, the switching resonance circuit further comprises a zener diode ZD1 disposed between the resistor R3 and the input terminal of the linear adjustment circuit, the positive electrode of the zener diode ZD1 is connected to the resistor R3, and the negative electrode of the zener diode ZD1 is connected to the input terminal of the linear adjustment circuit.
According to some embodiments of the application, the non-inverting terminal of the comparator AMP1 is connected to the output terminal of the comparator AMP1 through a resistor R2 and a capacitor C3 connected in series.
According to some embodiments of the present application, the linear adjustment circuit includes a MOS transistor Q2, an error amplifier AMP2, a differential amplifier AMP3, and a DAC module, an output end of the switch resonance circuit is connected to a drain of the MOS transistor Q2, a source of the MOS transistor Q2 is connected to a positive electrode of the output terminal, a positive electrode of the output terminal is connected to an in-phase end of the differential amplifier AMP3, a negative electrode of the output terminal is connected to an inverting end of the differential amplifier AMP3, an output end of the differential amplifier AMP3 is connected to an inverting end of the error amplifier AMP2, an input end of the DAC module is configured to receive a control amount signal, an output end of the DAC module is connected to an in-phase end of the error amplifier AMP2, an output end of the error amplifier AMP2 is connected to a gate of the MOS transistor Q2, and a source of the MOS transistor Q2 is connected to a second feedback end of the switch resonance circuit.
A power supply device according to an embodiment of the second aspect of the present application includes the high-efficiency low-noise power supply circuit described above.
The power supply device according to the embodiment of the second aspect of the present application has at least the following advantageous effects:
according to the embodiment of the application, the direct current voltage from alternating current to isolated is realized through the isolated rectifying and filtering circuit, the linear adjusting circuit is used for outputting the stabilized direct current power supply, the switching resonant circuit is arranged between the linear adjusting circuit and the isolated rectifying and filtering circuit, namely, the one-stage switching resonant circuit is added in the conventional linear power supply, so that the conversion efficiency of the linear power supply is greatly improved, the input condition of the switching resonant circuit adopts the voltage difference between the input and the output of the linear adjusting circuit of the later stage, and therefore, the output of the switching resonant circuit can always follow the output change of the linear adjusting circuit of the later stage, so that the voltage drop of the linear adjusting circuit is always constant, the conversion efficiency is improved, and the problem that the output voltages are different and the power is not identical is avoided. According to the application, the switch resonance circuit is introduced into the linear power supply, and ripple noise generated by the switch resonance circuit can be regulated by the linear regulation circuit, so that the conversion efficiency is improved, and the advantages of low ripple noise and quick response of the linear power supply are maintained.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
The application is further described with reference to the accompanying drawings and examples, in which:
FIG. 1 shows a high efficiency low noise power supply circuit in accordance with an embodiment of the present application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the application.
In the description of the present application, it should be understood that the direction or positional relationship indicated with respect to the description of the orientation, such as up, down, etc., is based on the direction or positional relationship shown in the drawings, is merely for convenience of describing the present application and simplifying the description, and does not indicate or imply that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.
In the description of the present application, plural means two or more. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present application, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present application can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
Referring to fig. 1, a high efficiency low noise power supply circuit includes: the device comprises an isolated rectifying filter circuit, a switch resonance circuit, a linear adjusting circuit and an output terminal. The input end of the isolation rectifying and filtering circuit is connected with 220V mains supply, and the output end of the isolation rectifying and filtering circuit converts 220V alternating current mains supply into direct current voltage for output and plays an isolating role of an alternating current end and a direct current end; the input end of the switch resonance circuit is connected with the output end of the isolation rectifying and filtering circuit; the input end of the linear adjusting circuit is connected with the output end of the switch resonance circuit, the input end of the linear adjusting circuit is connected with the first feedback end of the switch resonance circuit, the output end of the linear adjusting circuit is connected with the second feedback end of the switch resonance circuit, the input voltage of the linear adjusting circuit is adjusted by the voltage difference between the input end and the output end of the linear adjusting circuit, the output terminal is used as an output pin of the whole circuit, and the output end of the linear adjusting circuit is connected with the output terminal for outputting the power supply voltage.
According to the embodiment of the application, the direct current voltage from alternating current to isolated is realized through the isolated rectifying and filtering circuit, the linear adjusting circuit is used for outputting the stabilized direct current power supply, the switching resonant circuit is arranged between the linear adjusting circuit and the isolated rectifying and filtering circuit, namely, the one-stage switching resonant circuit is added in the conventional linear power supply, so that the conversion efficiency of the linear power supply is greatly improved, the input condition of the switching resonant circuit adopts the voltage difference between the input and the output of the linear adjusting circuit of the later stage, and therefore, the output of the switching resonant circuit can always follow the output change of the linear adjusting circuit of the later stage, so that the voltage drop of the linear adjusting circuit is always constant, the conversion efficiency is improved, and the problem that the output voltages are different and the power is not identical is avoided. According to the application, the switch resonance circuit is introduced into the linear power supply, and ripple noise generated by the switch resonance circuit can be regulated by the linear regulation circuit, so that the conversion efficiency is improved, and the advantages of low ripple noise and quick response of the linear power supply are maintained.
Specifically, the isolation rectifier filter circuit in the embodiment of the application comprises a power frequency transformer T1, a rectifier bridge BD1 and a filter capacitor C1, wherein the input end of the power frequency transformer T1 is connected with the mains supply, the output end of the power frequency transformer T1 is connected with the input end of the rectifier bridge BD1, and the output end of the rectifier bridge BD1 is connected with the input end of the switch resonance circuit through the filter capacitor C1.
In the isolation rectifying and filtering circuit, the power frequency transformer T1 performs electrical isolation and step-up and step-down, and then performs rectifying and filtering through the rectifying bridge BD1 and the filtering capacitor C1, thereby realizing the output of the dc voltage from ac to isolation.
Specifically, in the embodiment of the application, the switch resonant circuit includes a MOS transistor Q1, a filter inductor L1, a filter capacitor C2, a comparator AMP1 and a zener diode ZD1, the output end of the rectifier bridge BD1 is connected to the source of the MOS transistor Q1, the drain of the MOS transistor Q1 is connected to one end of the filter inductor L1, the other end of the filter inductor L1 is connected to the input end of the linear adjustment circuit, the common end of the filter inductor L1 and the linear adjustment circuit is grounded through the filter capacitor C2, the in-phase end of the comparator AMP1 is used as the first feedback end of the switch resonant circuit and is connected to the input end of the linear adjustment circuit through a resistor R3 and a zener diode ZD1, the positive electrode of the zener diode ZD1 is connected to a resistor R3, the negative electrode of the zener diode ZD1 is connected to the input end of the comparator AMP1 is used as the second feedback end of the switch resonant circuit and is connected to the output end of the linear adjustment circuit through a resistor R4, and the output end of the comparator AMP1 is connected to the gate of the MOS transistor Q1 through a resistor R1. The non-inverting terminal of the comparator AMP1 is connected to the output terminal of the comparator AMP1 through a resistor R2 and a capacitor C3 which are sequentially connected in series, and the zener diode ZD1 in this embodiment adopts a 2.5V zener diode.
Specifically, the linear adjusting circuit includes a MOS transistor Q2, an error amplifier AMP2 and a differential amplifier AMP3, the other end of the filter inductor L1 is connected to the drain of the MOS transistor Q2, the source of the MOS transistor Q2 is connected to the positive electrode of the output terminal, the positive electrode of the output terminal is connected to the in-phase end of the differential amplifier AMP3, the negative electrode of the output terminal is connected to the inverting end of the differential amplifier AMP3, the output end of the differential amplifier AMP3 is connected to the inverting end of the error amplifier AMP2, the MCU is connected to the in-phase end of the error amplifier AMP2, the output end of the error amplifier AMP2 is connected to the gate of the MOS transistor Q2, the source of the MOS transistor Q2 is connected to the inverting end of the comparator AMP1 through a resistor R6, the in-phase end of the comparator AMP1 is grounded through a resistor R5, the resistance values of the resistor R3 and the resistor R4 are equal, and the resistance values of the resistor R5 and the resistor R6 are equal.
The working principle of the application is described in detail below:
let the in-phase terminal voltage of the comparator AMP1 be V1, the reverse-phase terminal voltage be V2, the input voltage of the linear adjusting circuit be V3, the output voltage be V4, V3 is the drain voltage of the MOS transistor Q2, and V4 is the source voltage of the MOS transistor Q2. The comparator AMP1 and the zener diode ZD1 in the switch resonant circuit form a switch oscillating circuit, and the MOS transistor Q1 is controlled periodically to charge the filter inductor L1 and the filter capacitor C2, so as to maintain the voltage of V3.
The process for establishing the switch oscillation comprises the following steps: assuming that the voltage V1 is smaller than V2 at the beginning, the comparator AMP1 outputs a low level, the MOS transistor Q1 is turned on to charge the filter inductor L1 and the filter capacitor C2, the voltage V3 rises, and because the voltage of V1 is positively correlated with the voltage V3, the voltage V1 also rises accordingly, when the voltage V1 continuously rises until it is greater than V2, the comparator AMP1 outputs a high level, the MOS transistor Q1 is turned off, the voltage of V3 is gradually reduced due to the existence of a load at a later stage, the larger the load, the faster the V3 falls, the voltage V1 is smaller than V2 to a certain extent, so that the voltage V1 is repeatedly turned on and turned off to oscillate, dynamic balance is maintained, and finally the voltage of V1 is approximately equal to V2. It will be appreciated that the greater the output load in the circuit described above, the faster the switching frequency. The resistor R2 and the capacitor C3 are connected with the in-phase end and the output end of the comparator AMP1 to form positive feedback, local self-excitation oscillation is realized, and an oscillating square wave is formed to drive the MOS tube Q1 to be opened and closed.
The MOS tube Q2 in the linear adjusting circuit is used as a linear adjusting power tube, the linear adjusting circuit utilizes a negative feedback principle to amplify the voltage of an output terminal through the differential amplifier AMP3 and then inputs a feedback quantity to the error amplifier APM2, the DAC module simultaneously inputs a control quantity to the error amplifier AMP2, the error amplifier APM2 compares the feedback quantity with the control quantity to form an error signal to control the conduction size of the MOS tube Q2, when the feedback quantity of differential sampling is smaller than the control quantity, the error amplifier AMP2 amplifies a positive error signal to increase the conduction of the MOS tube Q2, the rising of the output voltage is realized, when the feedback quantity is larger than the control quantity, the error amplifier AMP2 amplifies a negative error signal to reduce the channel of the MOS tube Q2, the voltage drop is realized, the steady balance is finally reached, the steady state is not influenced by the input voltage and the load of the output end, and the perfect steady state effect can be realized.
It should be noted that, assuming that the positive voltage of the zener diode ZD1 is V5, when the circuit is balanced, V1 and V2 are dynamically equal according to the above analysis, since r3=r4, r5=r6, v5=v4, and v3—v5=2.5v are set to 2.5V for the zener diode ZD1, so that V3-V4 is also equal to 2.5V, which means that the voltage difference between V3 and V4 is constant, and when V4 rises or falls, V3 will also rise or fall. Therefore, the voltage difference of the MOS tube Q2 is kept to be 2.5V, and under the condition that the load current is unchanged, the self-consumed power of the MOS tube Q2 is unchanged, and the power cannot be changed along with the change of the output voltage.
The application also relates to a power supply device comprising the high-efficiency low-noise power supply circuit.
In summary, the application forms a linear power supply by the isolated rectifying and filtering circuit and the linear adjusting circuit, a primary switch resonant circuit is added in the linear power supply, the conversion efficiency of the power supply is greatly improved, the switch resonant circuit is simple in design, a switch control chip or a PWM controller and the like required by a conventional switch power supply are not needed, the circuit design is simplified, software control is not needed, the design cost of software and hardware is reduced, and the stability and the reliability of the circuit are also improved. And the switch resonance circuit follows the output of the linear adjusting circuit of the next stage, so that the constant voltage drop of the MOS tube Q2 is ensured, the constant power of the MOS tube Q2 is ensured no matter how large the voltage difference of the input and the output is, the problem that the conversion efficiency is lower when the voltage difference of the input and the output of the conventional linear power supply is larger is solved, and the conversion efficiency is greatly improved. Meanwhile, due to the reserved linear adjusting circuit, the circuit also has the advantages of low ripple noise and fast loop response of a conventional linear power supply.
The embodiments of the present application have been described in detail with reference to the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present application.

Claims (7)

1. A high efficiency low noise power supply circuit comprising:
the input end of the isolation rectifying and filtering circuit is used for being connected with a mains supply, and the output end of the isolation rectifying and filtering circuit is used for outputting a direct-current voltage;
the input end of the switch resonance circuit is connected with the output end of the isolation rectifying and filtering circuit;
the input end of the linear adjusting circuit is connected with the output end of the switch resonance circuit, the input end of the linear adjusting circuit is connected with the first feedback end of the switch resonance circuit, the output end of the linear adjusting circuit is connected with the second feedback end of the switch resonance circuit, and the input voltage of the linear adjusting circuit is adjusted by the voltage difference input and output by the linear adjusting circuit;
and the output end of the linear adjusting circuit is connected with the output terminal for outputting the power supply voltage.
2. The high-efficiency low-noise power supply circuit according to claim 1, wherein the isolation rectifying and filtering circuit comprises a power frequency transformer, a rectifying bridge and a filtering capacitor, wherein the input end of the power frequency transformer is connected with a mains supply, the output end of the power frequency transformer is connected with the input end of the rectifying bridge, and the output end of the rectifying bridge is connected with the input end of the switch resonance circuit through the filtering capacitor.
3. The high-efficiency low-noise power supply circuit according to claim 1, wherein the switch resonance circuit comprises a MOS transistor Q1, a filter inductor L1, a filter capacitor C2 and a comparator AMP1, an output end of the isolation rectifying filter circuit is connected to a source electrode of the MOS transistor Q1, a drain electrode of the MOS transistor Q1 is connected to one end of the filter inductor L1, the other end of the filter inductor L1 is connected to an input end of the linear adjustment circuit, a common end of the filter inductor L1 and the linear adjustment circuit is grounded through the filter capacitor C2, an in-phase end of the comparator AMP1 is used as a first feedback end of the switch resonance circuit and is connected to an input end of the linear adjustment circuit through a resistor R3, an inverting end of the comparator AMP1 is used as a second feedback end of the switch resonance circuit and is connected to an output end of the linear adjustment circuit through a resistor R4, and an output end of the comparator AMP1 is connected to a gate electrode of the MOS transistor Q1 through the resistor R1.
4. A high efficiency low noise power supply circuit according to claim 3, wherein said switching resonance circuit further comprises a zener diode ZD1 arranged between said resistor R3 and an input terminal of said linear adjustment circuit, a positive terminal of said zener diode ZD1 being connected to said resistor R3, a negative terminal of said zener diode ZD1 being connected to an input terminal of said linear adjustment circuit.
5. A high-efficiency low-noise power supply circuit according to claim 3, wherein the non-inverting terminal of the comparator AMP1 is connected to the output terminal of the comparator AMP1 via a resistor R2 and a capacitor C3 which are sequentially connected in series.
6. The high-efficiency low-noise power supply circuit according to claim 1, wherein the linear adjusting circuit comprises a MOS transistor Q2, an error amplifier AMP2, a differential amplifier AMP3 and a DAC module, an output end of the switch resonance circuit is connected to a drain electrode of the MOS transistor Q2, a source electrode of the MOS transistor Q2 is connected to an anode of the output terminal, an anode of the output terminal is connected to an in-phase end of the differential amplifier AMP3, a cathode of the output terminal is connected to an inverting end of the differential amplifier AMP3, an output end of the differential amplifier AMP3 is connected to an inverting end of the error amplifier AMP2, an input end of the DAC module is used for receiving a control amount signal, an output end of the DAC module is connected to an in-phase end of the error amplifier AMP2, an output end of the error amplifier AMP2 is connected to a gate electrode of the MOS transistor Q2, and a source electrode of the MOS transistor Q2 is connected to a second feedback end of the switch resonance circuit.
7. A power supply device comprising the high-efficiency low-noise power supply circuit according to any one of claims 1 to 6.
CN202310952444.4A 2023-07-31 2023-07-31 High-efficiency low-noise power supply circuit and power supply device Pending CN117013812A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310952444.4A CN117013812A (en) 2023-07-31 2023-07-31 High-efficiency low-noise power supply circuit and power supply device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310952444.4A CN117013812A (en) 2023-07-31 2023-07-31 High-efficiency low-noise power supply circuit and power supply device

Publications (1)

Publication Number Publication Date
CN117013812A true CN117013812A (en) 2023-11-07

Family

ID=88573937

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310952444.4A Pending CN117013812A (en) 2023-07-31 2023-07-31 High-efficiency low-noise power supply circuit and power supply device

Country Status (1)

Country Link
CN (1) CN117013812A (en)

Similar Documents

Publication Publication Date Title
US9362833B2 (en) Constant voltage constant current control circuits and methods with improved load regulation
US6969958B2 (en) Square wave drive system
US6876157B2 (en) Lamp inverter with pre-regulator
CN106026653B (en) Buck-boost converter with slope compensation and controller and control method thereof
US7825605B2 (en) DA/AC convert for driving cold cathode fluorescent lamp
US11463012B1 (en) Architecture for multi-port AC/DC switching mode power supply
CN103477295B (en) Current regulation apparatus
US11437924B2 (en) Switching power supply circuit
JP2012130122A (en) Dc/dc converter and power unit and electronic apparatus using the same
CN101868078B (en) Single-power level LED constant current driving device with high power factor
CN113972848B (en) Boost converter with high power factor
CN112117891A (en) Power supply
CN102104325A (en) Power factor converter and method
CN110572902A (en) Quasi-resonant dimming control system and method
US11147139B2 (en) Device for driving LED and method for driving LED
CN111867176B (en) LED drive circuit and silicon controlled rectifier dimming circuit
CN117013812A (en) High-efficiency low-noise power supply circuit and power supply device
KR101022613B1 (en) Alternating current power supply device and integrated circuit for alternating current power supply device
WO2007010718A1 (en) Self-excited inverter driving circuit
CN205811867U (en) Power supply adaptor
CN216959689U (en) Power supply system
CN114938131B (en) Control circuit and method of power factor correction circuit based on FLYBACK
CN113258755B (en) Boost converter
CN220570463U (en) Load adjustable circuit, power supply circuit, circuit board and electronic equipment
CN216531069U (en) Current equalizing circuit and display device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination