CN111697802A - Ripple wave eliminating circuit and switching power supply - Google Patents
Ripple wave eliminating circuit and switching power supply Download PDFInfo
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- CN111697802A CN111697802A CN202010619223.1A CN202010619223A CN111697802A CN 111697802 A CN111697802 A CN 111697802A CN 202010619223 A CN202010619223 A CN 202010619223A CN 111697802 A CN111697802 A CN 111697802A
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- ripple
- power supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Power Conversion In General (AREA)
Abstract
The invention relates to the technical field of power supplies, and provides a ripple wave elimination circuit and a switching power supply, wherein the ripple wave elimination circuit comprises: the filter module is connected between the power supply end and the ground and is formed by connecting a first capacitor and a first resistor in series, and the filter module provides a first voltage signal through a connection node of the first capacitor and the first resistor; the control module is provided with a first input end for receiving a first voltage signal and a second input end connected with the output end of the ripple wave elimination circuit, and generates a second voltage signal according to the first voltage signal; the power device is connected between the power supply end and the output end of the ripple eliminating circuit and connected with the output end of the control module, the second voltage signal is used for controlling the conduction state of the power device, the ripple eliminating circuit adjusts the second voltage signal according to the size of the input voltage so as to eliminate the ripple of the input voltage, and under the conduction state of the power device, the ripple-free third voltage signal, namely the output voltage, is generated so as to meet the working requirement of the circuit.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a ripple eliminating circuit and a switching power supply using the ripple eliminating circuit.
Background
In recent years, the switching power supply has been widely used in the fields of engineering, medical institutions, scientific research and the like due to its advantages of small size, light weight, high efficiency and the like.
An important indicator of ripple as a switching power supply is the magnitude of the absolute value of the ripple (including noise) of the output voltage, usually expressed in peak-to-peak or effective values, at the rated output voltage and load current. The ripple wave of the spiral power supply of the high-voltage power supply is generally less than five ten-thousandths, and the requirement of the photomultiplier is generally less than five hundred-thousandths. In recent years, how to suppress the ripple of the switching power supply has become a more popular problem.
The ripple reduction of the switching power supply mainly comprises two parts, namely a low-frequency ripple caused by the voltage disturbance of an input power supply (such as a 50Hz ripple of a power grid supply), and a high-frequency ripple caused by the switching frequency of the switching power supply. The control method for the low-frequency ripple mainly adjusts the loop characteristic of the switching power supply, the switching power supply with rapid loop response and stable work can inhibit the low-frequency ripple, and the method for solving the high-frequency ripple of the switching power supply mainly increases the switching frequency of the power supply or increases the output filter capacitor.
However, both of these approaches have significant limitations: on one hand, the power device cannot greatly improve the working frequency, so that the output ripple of the power supply cannot be reduced by improving the working frequency; on the other hand, the ripple wave can be reduced by increasing the output filter capacitor, but the power supply energy storage is increased, larger energy is released when the load is in short circuit, the stress requirement on the device is higher, especially, the high-voltage power supply is applied, the potential safety hazard exists, and meanwhile, the size and the weight of the power supply are difficult to reduce, so that the cost of the whole scheme is increased.
In short, the conventional switching power supply circuit or chip capable of eliminating or suppressing ripples has large volume, poor reliability and high cost.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a ripple eliminating circuit and a switching power supply, which can be used for solving the problem of output ripple of the switching power supply.
In one aspect, the present invention provides a ripple cancellation circuit, which includes:
the filter module comprises a first capacitor and a first resistor which are connected between a power supply end and the ground in series, the filter module provides a first voltage signal through a connection node of the first capacitor and the first resistor, and the power supply end is used for providing an input voltage;
the control module is provided with a first input end for receiving the first voltage signal and a second input end connected with the output end of the ripple wave elimination circuit, and generates a second voltage signal according to the first voltage signal;
a power device connected between the power supply terminal and the output terminal of the ripple cancellation circuit and connected with the output terminal of the control module, the second voltage signal is used for controlling the on-off state of the power device,
the ripple eliminating circuit adjusts the second voltage signal according to the magnitude of the input voltage to eliminate the ripple of the input voltage, and generates a third voltage signal without the ripple when the power device is in a conducting state.
Preferably, the ripple cancellation circuit further includes:
a second capacitor connected between the power supply terminal and ground; and
and the third capacitor is connected between the output end of the ripple elimination circuit and the ground.
Preferably, the aforementioned control module comprises:
the amplifier is provided with a first input end for receiving the first voltage signal and a second input end connected with the output end of the ripple wave elimination circuit, and the output end of the amplifier is connected with the power device;
and the input end of the charge pump is connected with the power supply end, the output end of the charge pump is connected with the amplifier, and the charge pump generates the working voltage of the amplifier according to the output voltage.
Preferably, the power device includes a transistor, a first end of the transistor is connected to the power supply terminal, a second end of the transistor is used as an output terminal of the ripple cancellation circuit, and a control terminal is connected to the output terminal of the control module.
Preferably, the transistor is an N-type metal oxide semiconductor field effect transistor.
Preferably, the third voltage signal follows a change in the input voltage, and has a voltage value positively correlated with a central value of the input voltage.
Preferably, the third voltage signal is equal to the central value of the input voltage minus a reference voltage, and the reference voltage is adjustable.
In another aspect, the present application further provides a switching power supply including the ripple cancellation circuit described above.
The invention has the beneficial effects that: the ripple cancellation circuit adopts a filter module to obtain a voltage center value (a first voltage signal) of input voltage accessed by a power supply end, generates a control voltage signal (a second voltage signal) through a comparison result of output voltage of the ripple cancellation circuit and the input voltage center value, controls the conduction state of a power tube by the control voltage signal (the second voltage signal), enables the output voltage to change along with the center value of the input voltage, subtracts a reference voltage value from the center value of the input voltage, and has an adjustable reference voltage value.
When the input voltage is lower than the voltage center value of the input voltage, the control module controls the output second voltage signal to increase so as to maintain the output unchanged; when the input voltage is higher than the voltage center value of the input voltage, the control module controls the output second voltage signal to be reduced so as to maintain the output unchanged. The output voltage of the circuit is only related to the central value of the input voltage, the output voltage is ripple-free voltage, the purpose of eliminating output voltage ripples is achieved, and the working requirement of the circuit is met.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 shows a schematic diagram illustrating a structure of a ripple cancellation circuit provided in an embodiment of the present application;
fig. 2 shows a circuit configuration diagram of the ripple cancellation circuit in the embodiment shown in fig. 1;
fig. 3 shows an operation timing diagram of the ripple removing circuit in the embodiment shown in fig. 2.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 shows a schematic structural diagram of a ripple cancellation circuit provided in an embodiment of the present application, and fig. 2 shows a circuit structural diagram of the ripple cancellation circuit in the embodiment shown in fig. 1.
Referring to fig. 1 and 2, an aspect of the present application provides a ripple cancellation circuit 100, where the ripple cancellation circuit 100 is configured to cancel a ripple of an input voltage VIN, and includes: a filtering module 110, a control module 120 and a power device T1,
specifically, the filtering module 110 includes a first capacitor C1 and a first resistor R1 connected in series between a power supply terminal and a ground, where the first capacitor C1 and the first resistor R1 in the filtering module 110 form a low-pass filter, which can be used to implement low-pass filtering on the input voltage VIN, so as to obtain a first voltage signal VIN _ AVG, i.e., a voltage center value (or an average value) of the input voltage VIN, and provide the first voltage signal VIN _ AVG through a connection node between the first capacitor C1 and the first resistor R1, where the power supply terminal is used to provide the input voltage VIN.
The control module 120 has a first input terminal for receiving the first voltage signal VIN _ AVG and a second input terminal connected to the output terminal of the ripple cancellation circuit 100, and the control module 120 generates a control voltage signal, i.e. a second voltage signal, according to a comparison result between the output voltage Vout of the ripple cancellation circuit 100 and the first voltage signal VIN _ AVG.
The power device T1 is connected between the power supply terminal and the output terminal of the ripple cancellation circuit 100, and is connected to the output terminal of the control module 120, and the second voltage signal is used to control the on state of the power device T1.
In the present embodiment, the ripple cancellation circuit 100 adjusts the second voltage signal according to the magnitude of the input voltage VIN to cancel the ripple of the input voltage VIN, and generates a ripple-free third voltage signal, i.e., the output voltage signal Vout, when the power device T1 is in the on state.
In a preferred embodiment, the control module 120 includes, but is not limited to, an amplifier 122 and a charge pump 120, wherein the amplifier 122 has a first input terminal receiving the first voltage signal VIN _ AVG and a second input terminal connected to the output terminal of the ripple cancellation circuit 100, the output terminal of the amplifier 122 is connected to the power device T1, the input terminal of the charge pump 121 is connected to the power supply terminal, the output terminal is connected to the amplifier 122, and the charge pump 121 generates the required operating voltage of the amplifier 122 according to the input voltage VIN provided by the power supply terminal.
Further, the amplifier 122 is an error amplifier, the first input terminal thereof is an in-phase input terminal, the second input terminal thereof is an inverting input terminal, and the amplifier is connected to the output terminal of the ripple cancellation circuit 100 through the inverting input terminal, thereby forming a negative feedback loop, realizing voltage following, improving the driving capability of signals, improving the performance of the amplifier (such as improving the stability of amplification factor, widening the frequency band, reducing nonlinear distortion, etc.), further improving the precision of the ripple cancellation circuit 100 in adjusting the output voltage Vout, and the ripple cancellation circuit 100 has a simple structure, which is beneficial to reducing the production cost.
Meanwhile, the ripple cancellation circuit 100 adopts an on-chip charge pump technology, and generates a voltage required by the operation of the amplifier 122 through the charge pump 121 connected with the amplifier 122 inside the chip, thereby equivalently replacing an external capacitor required by a bootstrap circuit. The chip can generate a low voltage Vreg, preferably 5V in this embodiment, required by the internal circuit of the chip according to the input voltage. The charge pump 121 generates a voltage VIN + Vreg (in an alternative embodiment, the voltage Vreg may be the low voltage Vreg and the chip output voltage Vout generates the voltage Vout + Vreg, without limitation), which is higher than the input (or output) voltage Vreg, for driving the amplifier 122.
In a preferred embodiment, the ripple cancellation circuit 100 further includes a second capacitor C2 connected between the power supply terminal and ground, and a third capacitor C3 connected between the output terminal of the ripple cancellation circuit 100 and ground, further, the second capacitor C2 is a filter capacitor, and forms a pi-type RC filter circuit with the first resistor R1 and the first capacitor C1 in the filter module 110, the second capacitor C2 can filter the input voltage VIN first to remove most of the ac components, and then add the ac components to the filter circuit 110 formed by Rl and C1, and the capacitor C1 further filters the ac components to make a small amount of ac current reach the ground terminal through the C1.
In a preferred embodiment, the power device T1 may be a transistor, a first terminal of the transistor is connected to the power supply terminal, a second terminal of the transistor is connected to the output terminal of the ripple cancellation circuit 100, and a control terminal of the transistor is connected to the output terminal of the control module 120. Further, in the present embodiment, the power device T1 is an N-type Metal Oxide Semiconductor Field Effect Transistor (MOSFET). Specifically, the first terminal of the transistor T1 is a drain, the second terminal is a source, the control terminal is a gate, and the second voltage signal generated by the amplifier in the control module 120 is the control voltage signal received by the gate of the transistor T1. Of course, the present invention is not limited thereto, and in other embodiments, the transistor may also be an N-type bipolar transistor or other semiconductor power device, and the present invention should not be limited thereto.
Fig. 3 shows an operation timing diagram of the ripple removing circuit in the embodiment shown in fig. 2.
In this embodiment, the ripple cancellation circuit 100 provided by the present invention uses the filtering module 110 to obtain the voltage center value VIN _ AVG (i.e., the first voltage signal) of the input voltage VIN, generates the control voltage signal (i.e., the second voltage signal) according to the comparison result between the output voltage Vout of the ripple cancellation circuit 100 and the voltage center value VIN _ AVG, and the control terminal of the power device (i.e., the gate of the transistor T1) receives the control voltage signal (i.e., the second voltage signal) output from the amplifier 232 in the control module 120, and sets the output voltage Vout (i.e., the third voltage signal) output by the power device.
The output voltage Vout of the ripple removing circuit 100 follows the central value of the input voltage VIN, the output voltage signal (i.e., the third voltage signal) Vout may be equal to the central value of the input voltage VIN — AVG (i.e., the first voltage signal) minus a reference voltage Δ V (as shown in fig. 3, and the reference voltage Δ V may be set to 0.2, 0.3, etc.), and the reference voltage Δ V may be adjustable. The reference voltage value delta V can be set to different values by methods such as on-chip trimming or off-chip trimming, and the like, so that a user can conveniently select the reference voltage value delta V according to needs. Further, the reference voltage value Δ V should be larger than the sum of the product of the on-resistance and the maximum output current and the present input voltage ripple 1/2.
In this embodiment, the second voltage signal controls the on state of the transistor T1 to make the output voltage follow the voltage center value of the input voltage to change, the output voltage is the voltage center value of the input voltage minus a reference voltage Δ V, and when the input voltage is lower than the voltage center value of the input voltage, the control module 120 controls the output second voltage signal to increase to maintain the output unchanged; when the input voltage is higher than the voltage center value of the input voltage, the control module 120 controls the output second voltage signal to decrease to maintain the output constant. Thereby adjusting the output voltage signal Vout (i.e., the third voltage signal) to a predetermined value, the timing diagram of each signal of the ripple cancellation circuit 100 in the operating state is shown in fig. 3.
The ripple eliminating circuit provided by the embodiment of the invention can be used for eliminating low-frequency ripples remained after an AC rectified signal passes through AC-DC/DC-DC after a switching power supply; the method can also be used for eliminating high-frequency ripples in the switching converter or common-mode ripple noise caused by equivalent capacitance generated when a power device of the switching power supply uses a shell as a radiator;
in addition, the ripple caused by loop regulation in the switching power supply loop can be well eliminated.
In application of the switching power supply, the ripple cancellation circuit provided by the embodiment of the application can be used as an intermediate-stage circuit, and after the ripple generated by a connected front-stage circuit is cancelled, a ripple-free power supply signal is provided for a rear-stage circuit (which is generally sensitive and requires a very small ripple).
In another aspect, the present application further provides a switching power supply having the ripple cancellation circuit described in the above embodiments.
To sum up, the ripple cancellation circuit provided in the embodiment of the present application can adjust the output voltage signal (i.e., the third voltage signal) to the predetermined value through the manner described in the above embodiment, so as to achieve the purpose of eliminating the input voltage ripple, and meet the working requirements of the circuit.
Although the present invention and its advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as described. Essentially, the discussion included in this application is intended to serve as a basic description.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", and the like, indicate orientations or positional relationships, are used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referenced components or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Further, in this document, the contained terms "include", "contain" or any other variation thereof are intended to cover a non-exclusive inclusion, so that a process, a method, an article or an apparatus including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such process, method, article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (8)
1. A ripple cancellation circuit, comprising:
the filter module comprises a first capacitor and a first resistor which are connected between a power supply end and the ground in series, the filter module provides a first voltage signal through a connection node of the first capacitor and the first resistor, and the power supply end is used for providing an input voltage;
the control module is provided with a first input end for receiving the first voltage signal and a second input end connected with the output end of the ripple cancellation circuit, and generates a second voltage signal according to the first voltage signal;
a power device connected between the power supply terminal and the output terminal of the ripple cancellation circuit and connected to the output terminal of the control module, wherein the second voltage signal is used for controlling the conduction state of the power device,
the ripple eliminating circuit adjusts the second voltage signal according to the magnitude of the input voltage to eliminate ripples of the input voltage, and a third voltage signal without ripples is generated when the power device is in a conducting state.
2. The ripple cancellation circuit of claim 1, further comprising:
a second capacitor connected between the power supply terminal and ground; and
and the third capacitor is connected between the output end of the ripple cancellation circuit and the ground.
3. The ripple cancellation circuit of claim 1, wherein the control module comprises:
the amplifier is provided with a first input end for receiving the first voltage signal and a second input end connected with the output end of the ripple cancellation circuit, and the output end of the amplifier is connected with the power device;
the input end of the charge pump is connected with the power supply end, the output end of the charge pump is connected with the amplifier, and the charge pump generates working voltage of the amplifier according to the input voltage.
4. The ripple cancellation circuit of claim 1, wherein the power device comprises a transistor, a first terminal of the transistor is connected to the power supply terminal, a second terminal of the transistor is used as an output terminal of the ripple cancellation circuit, and a control terminal of the transistor is connected to an output terminal of the control module.
5. The ripple cancellation circuit of claim 4, wherein the transistor is an N-type metal oxide semiconductor field effect transistor.
6. The ripple cancellation circuit of claim 1, wherein the third voltage signal varies with a change in a central value of the input voltage, and a voltage value of the third voltage signal is positively correlated with the central value of the input voltage.
7. The ripple cancellation circuit of claim 6, wherein the third voltage signal is equal to a center value of the input voltage minus a reference voltage, and the reference voltage is adjustable in value.
8. A switching power supply, comprising: the ripple cancellation circuit of any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010619223.1A CN111697802B (en) | 2020-06-30 | 2020-06-30 | Ripple wave eliminating circuit and switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010619223.1A CN111697802B (en) | 2020-06-30 | 2020-06-30 | Ripple wave eliminating circuit and switching power supply |
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| CN111697802A true CN111697802A (en) | 2020-09-22 |
| CN111697802B CN111697802B (en) | 2022-03-01 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08147050A (en) * | 1994-11-18 | 1996-06-07 | Sony Corp | Power circuit |
| US6489755B1 (en) * | 2000-09-18 | 2002-12-03 | Adtran, Inc. | Active ripple and noise filter for telecommunication equipment powering |
| CN101471603A (en) * | 2007-12-27 | 2009-07-01 | 英业达股份有限公司 | DC-DC decompression converter and ripple improving circuit |
| CN102203690A (en) * | 2008-12-10 | 2011-09-28 | 凌特公司 | Current ripple reduction circuit for leds |
| CN109388168A (en) * | 2017-08-09 | 2019-02-26 | 原相科技股份有限公司 | Optical sensor arrangement and voltage regulator arrangement |
-
2020
- 2020-06-30 CN CN202010619223.1A patent/CN111697802B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08147050A (en) * | 1994-11-18 | 1996-06-07 | Sony Corp | Power circuit |
| US6489755B1 (en) * | 2000-09-18 | 2002-12-03 | Adtran, Inc. | Active ripple and noise filter for telecommunication equipment powering |
| CN101471603A (en) * | 2007-12-27 | 2009-07-01 | 英业达股份有限公司 | DC-DC decompression converter and ripple improving circuit |
| CN102203690A (en) * | 2008-12-10 | 2011-09-28 | 凌特公司 | Current ripple reduction circuit for leds |
| CN109388168A (en) * | 2017-08-09 | 2019-02-26 | 原相科技股份有限公司 | Optical sensor arrangement and voltage regulator arrangement |
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| CN111697802B (en) | 2022-03-01 |
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