CN115473427A - Power adapter - Google Patents

Power adapter Download PDF

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Publication number
CN115473427A
CN115473427A CN202211228103.4A CN202211228103A CN115473427A CN 115473427 A CN115473427 A CN 115473427A CN 202211228103 A CN202211228103 A CN 202211228103A CN 115473427 A CN115473427 A CN 115473427A
Authority
CN
China
Prior art keywords
capacitor
alternating
voltage
direct current
alternating current
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
CN202211228103.4A
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Chinese (zh)
Inventor
毛志明
黄秉仁
刘长生
邱天明
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.)
Guangdong Crdm Electric Technology Co ltd
Original Assignee
Guangdong Crdm Electric 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 Guangdong Crdm Electric Technology Co ltd filed Critical Guangdong Crdm Electric Technology Co ltd
Priority to CN202211228103.4A priority Critical patent/CN115473427A/en
Publication of CN115473427A publication Critical patent/CN115473427A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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

Abstract

The invention provides a power adapter, and relates to the field of power adapters; the power adapter includes: the voltage-dependent resistor, the alternating conversion power supply and the suppression circuit are connected with the voltage-dependent resistor in parallel; the alternating conversion power supply is connected with the suppression circuit; the suppression circuit includes: the common-mode inductor comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and a common-mode inductor; the piezoresistor is electrically connected with the alternating current; the first capacitor is connected with the input end of the common-mode inductor in parallel; one end of the third capacitor and the other end of the fourth capacitor are both connected with the common-mode inductance output end, and the other end of the third capacitor is connected with one end of the fourth capacitor; the connection point of the third capacitor and the fourth capacitor is grounded; one end of the second capacitor is connected with one end of the third capacitor, and the other end of the second capacitor is connected with the other end of the fourth capacitor; the alternating conversion power supply is connected with the second capacitor and converts the alternating current passing through the suppression circuit into target direct current; the invention can improve the anti-interference capability.

Description

Power adapter
Technical Field
The invention relates to the field of power adapters, in particular to a power adapter.
Background
The power adapter in the prior art is generally suitable for civil equipment, and has low cost and low anti-interference capability. When the interference such as fast transient pulse group, surge, radio frequency conduction and the like is applied, the phenomenon that the output voltage of the adapter is abnormal or cannot normally work at all occurs, and the use of intelligent equipment of a power system cannot be met.
Disclosure of Invention
The invention aims to provide a power adapter to improve the anti-interference capability.
In order to achieve the purpose, the invention provides the following scheme:
a power adapter, the power adapter comprising: the voltage-sensitive resistor, the alternating conversion power supply and the suppression circuit are connected with the voltage-sensitive resistor in parallel; the alternating conversion power supply is connected with the suppression circuit;
the suppression circuit includes: the common-mode inductor comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and a common-mode inductor;
the piezoresistor is electrically connected with alternating current;
the first capacitor is connected with the piezoresistor in parallel, one end of the first capacitor is connected with a first input end of the common-mode inductor, and the other end of the first capacitor is connected with a second input end of the common-mode inductor;
one end of the third capacitor is connected with the first output end of the common-mode inductor, and the other end of the third capacitor is connected with one end of the fourth capacitor;
the other end of the fourth capacitor is connected with a second output end of the common-mode inductor;
the connection point of the third capacitor and the fourth capacitor is grounded;
one end of the second capacitor is connected with one end of the third capacitor, and the other end of the second capacitor is connected with the other end of the fourth capacitor;
the input end of the alternating conversion power supply is connected with the second capacitor, and the alternating conversion power supply is used for converting the alternating current passing through the suppression circuit into target direct current.
Optionally, the power adapter further comprises: a fuse;
and the fuse is connected between the piezoresistor and the alternating current.
Optionally, the power adapter further comprises: a fifth capacitor;
the output end of the alternating conversion power supply is connected with the fifth capacitor; and the fifth capacitor is used for filtering the target direct current output by the alternating conversion power supply.
Optionally, the alternating conversion power supply comprises: the system comprises a first processing module, an oscillator and a second processing module which are connected in sequence;
the first processing module is connected with the second capacitor;
the first processing module is used for performing alternating current-direct current conversion on the alternating current passing through the suppression circuit and performing filtering processing to obtain a first direct current;
the oscillator is used for inverting the first direct current into first alternating current and changing the voltage amplitude of the first alternating current to obtain pulse voltage;
and the second processing module is used for performing alternating current-direct current conversion on the pulse voltage and filtering to obtain target direct current.
Optionally, the first processing module includes: the first rectifying module and the first filter are connected in sequence;
the first rectifying module is connected with the second capacitor;
the first rectifying module is used for converting alternating current passing through the suppression circuit into alternating current and direct current;
the first filter is used for filtering the converted voltage to obtain the first direct current.
Optionally, the oscillator comprises: a switching transformer and a switching tube;
the switch transformer is connected with the switch tube; the switch transformer is used for converting the first direct current into first alternating current; the switch transformer is also used for changing the voltage amplitude of the first alternating current to obtain the pulse voltage; the switching tube is used for controlling the on-off of the switching transformer.
Optionally, the second processing module includes: the second rectifying module and the second filter;
the second rectifying module is connected with the oscillator; the second filter is connected with the second rectifying module;
the second rectifying module is used for converting the pulse voltage into alternating current and direct current; the second filter is used for filtering the voltage subjected to alternating conversion by the second rectifying module to obtain the target direct current.
Optionally, the alternating conversion power supply further comprises: a pulse controller and a feedback module;
the pulse controller is connected with the oscillator; the feedback module is connected with the pulse controller and the output end of the second processing module;
the feedback module is used for acquiring the voltage of the target direct current and feeding the voltage back to the pulse controller; the pulse controller is used for adjusting the width or the duty ratio of the pulse voltage according to the voltage fed back by the feedback module.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
an embodiment of the present invention provides a power adapter, including: the voltage-dependent resistor, the alternating conversion power supply and the suppression circuit are connected with the voltage-dependent resistor in parallel; the suppression circuit includes: the common-mode inductor comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and a common-mode inductor; because the piezoresistor is connected with the alternating current, the piezoresistor can absorb the surge of the alternating current; the first capacitor is connected with the piezoresistor in parallel, one end of the first capacitor is connected with the first input end of the common-mode inductor, and the other end of the first capacitor is connected with the second input end of the common-mode inductor; one end of the third capacitor is connected with the first output end of the common-mode inductor, and one end of the third capacitor is connected with one end of the second capacitor; the other end of the third capacitor is connected with one end of the fourth capacitor; the other end of the fourth capacitor is connected with the second output end of the common-mode inductor, and the other end of the fourth capacitor is connected with the other end of the second capacitor; the connection point of the third capacitor and the fourth capacitor is grounded; therefore, the suppression circuit can suppress electromagnetic interference and common mode interference; the alternating current passing through the suppression circuit is converted into direct current through an alternating conversion power supply; therefore, the power adapter provided by the invention can improve the anti-interference capability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a circuit diagram of a power adapter according to an embodiment of the present invention;
fig. 2 is a structural diagram of an alternating current conversion power supply according to an embodiment of the present invention.
Description of the symbols:
the device comprises an alternating conversion power supply-1, a suppression circuit-2, a first processing module-3, an oscillator-4, a second processing module-5, a pulse controller-6 and a feedback module-7.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a power adapter to improve the anti-interference capability.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The main reference symbols appearing in the embodiments of the present invention will be explained first:
FS: a fuse; RV: a voltage dependent resistor; c1: a first capacitor; c2: a second capacitor; c3: a third capacitor; c4: a fourth capacitor; c5: a fifth capacitor; l1: and (4) common mode inductance.
As shown in fig. 1 to 2, an embodiment of the present invention provides a power adapter, including: the device comprises a voltage dependent resistor RV, an alternating conversion power supply 1 and a suppression circuit 2 connected with the voltage dependent resistor RV in parallel; the alternating current conversion power supply 1 is connected to the suppression circuit 2. The voltage dependent resistor RV is used to absorb a surge generated when an ac power is input, so as to protect an internal circuit of the power adapter. That is, when the internal circuit is subject to overvoltage, the voltage dependent resistor RV absorbs redundant current to protect sensitive devices in the circuit.
The suppression circuit 2 includes: the circuit comprises a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4 and a common mode inductor L1.
The piezoresistor RV is electrically connected with alternating current; the first capacitor C1 is connected with the piezoresistor RV in parallel, one end of the first capacitor C1 is connected with a first input end of the common-mode inductor L1, and the other end of the first capacitor C1 is connected with a second input end of the common-mode inductor L1; one end of a third capacitor C3 is connected with the first output end of the common-mode inductor L1, and the other end of the third capacitor C3 is connected with one end of a fourth capacitor C4; the other end of the fourth capacitor C4 is connected with the second output end of the common-mode inductor L1; the connection point of the third capacitor C3 and the fourth capacitor C4 is grounded; one end of the second capacitor C2 is connected to one end of the third capacitor C3, and the other end of the second capacitor C2 is connected to the other end of the fourth capacitor C4.
Through the connection of first electric capacity C1 and common mode inductance L1 to and the connection of second electric capacity C2 and common mode inductance L1, can restrain EMI electromagnetic interference, in order to promote this power adapter's interference killing feature.
The third capacitor C3 is connected with the fourth capacitor C4 and is connected with the common-mode inductor L1, so that common-mode interference can be suppressed. I.e. improved EMS electromagnetic resistance.
The input end of the alternating current conversion power supply 1 is connected with the second capacitor C2, and the alternating current conversion power supply 1 is used for converting the alternating current passing through the suppression circuit 2 into the target direct current. The alternating current can be 220V alternating current. The alternating current of 220V is converted into low-voltage direct current, which may be direct current of 5V, by the alternating conversion power supply 1.
Specifically, the alternating current conversion power supply 1 includes: the device comprises a first processing module 3, an oscillator 4 and a second processing module 5 which are connected in sequence.
The first processing module 3 is connected with the second capacitor C2; the first processing module 3 is used for performing alternating current-direct current conversion on the alternating current passing through the suppression circuit 2 and performing filtering processing to obtain a first direct current; the oscillator 4 is used for inverting the first direct current into a first alternating current and changing the voltage amplitude of the first alternating current to obtain pulse voltage; the second processing module 5 is used for performing ac-dc conversion on the pulse voltage and performing filtering processing to obtain a target direct current.
Further, the first processing module 3 includes: the first rectifier module and the first filter are connected in sequence.
The first rectifying module is connected with the second capacitor C2; the first rectifying module is used for converting alternating current passing through the suppression circuit 2 into alternating current and direct current; the first filter is used for filtering the converted voltage to obtain a first direct current.
The oscillator 4 includes: a switching transformer and a switching tube; the switch transformer is connected with the switch tube; the switching transformer is used for converting the first direct current into the first alternating current. The switching transformer is also used for changing the voltage amplitude of the first alternating current to obtain pulse voltage. I.e. the switching transformer, is also able to reduce the voltage amplitude of the first alternating current. The switching tube is used for controlling the on-off of the switching transformer.
In brief, the switching transformer and the switching tube form a self-excited or separately excited intermittent oscillator, so that the input first direct-current voltage modulation is converted into a high-frequency pulse voltage. Further, the oscillator 4 functions as energy transfer and conversion. The oscillator 4 converts the input dc voltage into various low voltages as required.
The second processing module 5 includes: the second rectifying module and the second filter; the second rectifying module is connected with the oscillator 4; the second filter is connected with the second rectifying module; the second rectifying module is used for converting the pulse voltage into alternating current and direct current; the second filter is used for filtering the voltage subjected to alternating conversion by the second rectifying module to obtain target direct current.
Preferably, the alternating conversion power supply 1 further includes: a pulse controller 6 and a feedback module 7.
The pulse controller 6 is connected with the oscillator 4; the feedback module 7 is connected with the pulse controller 6 and with the output of the second processing module 5.
The feedback module 7 is used for acquiring the voltage of the target direct current and feeding the voltage back to the pulse controller 6; the pulse controller 6 is used for adjusting the width or duty ratio of the pulse voltage according to the voltage fed back by the feedback module 7.
The pulse controller 6 adjusts the on-to-off time ratio of the switching tube in the oscillator 4 by PWM pulse width modulation, so that the voltage of the output target dc power is kept stable.
As an optional implementation, the power adapter further comprises: the fuse FS. And a fuse FS is connected between the voltage dependent resistor RV and the alternating current. The fuse FS mainly plays a role in protection, so as to prevent power failure at the input end, i.e., to protect the safety of the circuit inside the power adapter when ac power is input.
In addition, the power adapter further includes: a fifth capacitor C5; the output end of the alternating conversion power supply 1 is connected with a fifth capacitor C5; the fifth capacitor C5 is used for filtering the target direct current output by the alternating conversion power supply 1.
The power adapter is an AC/DC power adapter with AC input and DC output, and has the characteristics of high conversion efficiency and large output current compared with a linear power adapter. In addition, the power adapter can also comprise a shell and a direct current power indicator lamp. The power adapter suppresses electromagnetic interference and common mode interference through the suppression circuit 2, and improves the anti-interference capability.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principle and the embodiment of the present invention are explained by applying specific examples, and the above description of the embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (8)

1. A power adapter, comprising: the voltage-sensitive resistor, the alternating conversion power supply and the suppression circuit are connected with the voltage-sensitive resistor in parallel; the alternating conversion power supply is connected with the suppression circuit;
the suppression circuit includes: the common-mode inductor comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and a common-mode inductor;
the piezoresistor is electrically connected with alternating current;
the first capacitor is connected with the piezoresistor in parallel, one end of the first capacitor is connected with a first input end of the common-mode inductor, and the other end of the first capacitor is connected with a second input end of the common-mode inductor;
one end of the third capacitor is connected with the first output end of the common-mode inductor, and the other end of the third capacitor is connected with one end of the fourth capacitor;
the other end of the fourth capacitor is connected with a second output end of the common-mode inductor;
the connection point of the third capacitor and the fourth capacitor is grounded;
one end of the second capacitor is connected with one end of the third capacitor, and the other end of the second capacitor is connected with the other end of the fourth capacitor;
the input end of the alternating conversion power supply is connected with the second capacitor, and the alternating conversion power supply is used for converting the alternating current passing through the suppression circuit into target direct current.
2. The power adapter as claimed in claim 1, further comprising: a fuse;
and the fuse is connected between the piezoresistor and the alternating current.
3. The power adapter as claimed in claim 1, further comprising: a fifth capacitor;
the output end of the alternating conversion power supply is connected with the fifth capacitor; and the fifth capacitor is used for filtering the target direct current output by the alternating conversion power supply.
4. The power adapter as claimed in claim 1, wherein the alternating conversion power supply comprises: the system comprises a first processing module, an oscillator and a second processing module which are connected in sequence;
the first processing module is connected with the second capacitor;
the first processing module is used for performing alternating current-direct current conversion on the alternating current passing through the suppression circuit and performing filtering processing to obtain a first direct current;
the oscillator is used for inverting the first direct current into first alternating current and changing the voltage amplitude of the first alternating current to obtain pulse voltage;
and the second processing module is used for performing alternating current-direct current conversion on the pulse voltage and filtering to obtain target direct current.
5. The power adapter as claimed in claim 4, wherein the first processing module comprises: the first rectifying module and the first filter are connected in sequence;
the first rectifying module is connected with the second capacitor;
the first rectifying module is used for converting alternating current passing through the suppression circuit into alternating current and direct current;
the first filter is used for filtering the converted voltage to obtain the first direct current.
6. The power adapter as described in claim 4, wherein said oscillator comprises: a switching transformer and a switching tube;
the switch transformer is connected with the switch tube; the switch transformer is used for converting the first direct current into first alternating current; the switch transformer is also used for changing the voltage amplitude of the first alternating current to obtain the pulse voltage; the switch tube is used for controlling the on-off of the switch transformer.
7. The power adapter as claimed in claim 4, wherein the second processing module comprises: the second rectifying module and the second filter;
the second rectifying module is connected with the oscillator; the second filter is connected with the second rectifying module;
the second rectifying module is used for converting the pulse voltage into alternating current and direct current; the second filter is used for filtering the voltage subjected to alternating conversion by the second rectifying module to obtain the target direct current.
8. The power adapter as claimed in claim 4, wherein the alternating conversion power supply further comprises: a pulse controller and a feedback module;
the pulse controller is connected with the oscillator; the feedback module is connected with the pulse controller and the output end of the second processing module;
the feedback module is used for acquiring the voltage of the target direct current and feeding the voltage back to the pulse controller; the pulse controller is used for adjusting the width or the duty ratio of the pulse voltage according to the voltage fed back by the feedback module.
CN202211228103.4A 2022-10-09 2022-10-09 Power adapter Pending CN115473427A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211228103.4A CN115473427A (en) 2022-10-09 2022-10-09 Power adapter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211228103.4A CN115473427A (en) 2022-10-09 2022-10-09 Power adapter

Publications (1)

Publication Number Publication Date
CN115473427A true CN115473427A (en) 2022-12-13

Family

ID=84337551

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211228103.4A Pending CN115473427A (en) 2022-10-09 2022-10-09 Power adapter

Country Status (1)

Country Link
CN (1) CN115473427A (en)

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