CN217445242U - Power adapter for reducing common-mode inductance - Google Patents
Power adapter for reducing common-mode inductance Download PDFInfo
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- CN217445242U CN217445242U CN202221502101.5U CN202221502101U CN217445242U CN 217445242 U CN217445242 U CN 217445242U CN 202221502101 U CN202221502101 U CN 202221502101U CN 217445242 U CN217445242 U CN 217445242U
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Abstract
The utility model relates to the technical field of power supply, in particular to a power adapter for reducing common mode inductance, which comprises a live wire input interface, a zero line input interface, a positive output interface, a negative output interface, a soft bridge module, a PWM pulse width modulation module, an output module and common mode inductance LF 1; the cathode of the fast recovery diode D1 and the anode of the fast recovery diode D3 are respectively connected with the input end of the PWM module through a common-mode inductor LF 1; and the output end of the PWM module is respectively connected with the positive output interface and the negative output interface through the output module. The utility model discloses fast recovery diode D1, fast recovery diode D2, fast recovery diode D3 and fast recovery diode D4 reverse recovery this period of time at soft bridge module can resume fast for the current change rate of circuit reduces, reduces the harmonic current oscillation that produces in the return circuit from this by a wide margin, thereby can select less inductance and less volume common mode inductance LF1, be convenient for realize the miniaturization of adapter.
Description
Technical Field
The utility model relates to a power technical field, concretely relates to reduce common mode inductance's power adapter.
Background
The input end of the power adapter needs to suppress the interference signal by using a common-mode inductor due to the existence of common-mode interference.
The adapter is developed in the direction of miniaturization and high density, a common-mode inductor with a large inductance is required to be used in the traditional power adapter to suppress common-mode interference, namely, the common-mode inductor with a large volume is required to be used, and the space of the adapter shell is limited, so that great trouble is caused to developers.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the above-mentioned not enough among the prior art, provide a reduce common mode inductance's power adapter.
The purpose of the utility model is realized through the following technical scheme: a power adapter for reducing common mode inductance comprises a live wire input interface, a zero line input interface, a positive output interface, a negative output interface, a soft bridge module, a PWM (pulse width modulation) module, an output module and common mode inductance LF 1;
the soft bridge module comprises a fast recovery diode D1, a fast recovery diode D2, a fast recovery diode D3, and a fast recovery diode D4; the anode of the fast recovery diode D1 is connected with the live wire input interface; the cathode of the fast recovery diode D1 is connected with the cathode of the fast recovery diode D2; the anode of the fast recovery diode D2 is connected with the cathode of the fast recovery diode D4; the cathode of the fast recovery diode D4 is connected with the zero line input interface; the anode of the fast recovery diode D4 is connected with the anode of the fast recovery diode D3; the cathode of the fast recovery diode D3 is connected with the anode of the fast recovery diode D1;
the cathode of the fast recovery diode D1 and the anode of the fast recovery diode D3 are respectively connected with the input end of the PWM module through a common-mode inductor LF 1; and the output end of the PWM module is respectively connected with the positive output interface and the negative output interface through the output module.
The utility model discloses it further sets up to, PWM pulse width modulation module includes PWM control chip U1 and transformer T1; the transformer comprises a primary winding, a secondary winding and an auxiliary winding;
the PWM control chip U1 is connected with the auxiliary winding; the soft bridge module is connected with the primary winding through a common-mode inductor LF 1; and the secondary winding is connected with the output module.
The utility model discloses it is further arranged that the power adapter for reducing the common mode inductance further comprises a feedback module; the feedback module comprises an optical coupler transmitter U2B, an optical coupler receiver U2A, a voltage regulator tube U3 and a voltage dividing resistor R12; one end of the divider resistor R12 is connected with the positive output interface; the other end of the divider resistor R12 is connected with the cathode of a voltage regulator tube U3 through an optocoupler emitter U2B; the anode of the voltage stabilizing tube U3 is grounded; and the optical coupler receiver U2A is connected with the PWM control chip U1.
The utility model discloses it further sets up to, output module includes zener diode D3, electric capacity C6, electric capacity EC4 and electric capacity EC 5; the capacitor C6, the capacitor EC4 and the capacitor EC5 are connected in parallel; the capacitor C6, the capacitor EC4 and the capacitor EC5 are arranged between the positive output interface and the negative output interface; the anode of the voltage-stabilizing diode D3 is connected with the secondary winding; the cathode of the zener diode D3 is connected to the positive output interface.
The utility model discloses it is further arranged that the power adapter of reducing common mode inductance still includes electric capacity EC1 and electric capacity EC 2; the capacitor EC1 is arranged between the soft bridge module and the common-mode inductor LF 1; the capacitor EC2 is arranged between the common-mode inductor LF1 and the PWM module.
The utility model discloses further set up as, fuse F1 between fast recovery diode D1's positive pole and the live wire input interface.
The utility model discloses further set up as, be equipped with piezo-resistor MOV1 between protective tube F1 and the zero line input interface.
The utility model discloses set up further as, thermistor NTC1 between fast recovery diode D3's negative pole and the zero line input interface.
The utility model has the advantages that: the utility model discloses fast recovery diode D1, fast recovery diode D2, fast recovery diode D3 and fast recovery diode D4 reverse recovery this period of time at soft bridge module can resume fast for the current change rate of circuit reduces, reduces the harmonic current oscillation that produces in the return circuit from this by a wide margin, thereby can select less inductance and less volume common mode inductance LF1, be convenient for realize the miniaturization of adapter.
Drawings
The invention is further described with the aid of the accompanying drawings, in which, however, the embodiments do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be derived from the following drawings without inventive effort.
Fig. 1 is a circuit diagram of the present invention;
wherein: 1. a live line input interface; 2. a zero line input interface; 3. a positive output interface; 4. a negative output interface; 51. a primary winding; 52. a secondary winding; 53. an auxiliary winding.
Detailed Description
The invention will be further described with reference to the following examples.
As can be seen from fig. 1, the power adapter for reducing the common-mode inductance according to this embodiment includes a live line input interface 1, a zero line input interface 2, a positive output interface 3, a negative output interface 4, a soft bridge module, a PWM pulse width modulation module, an output module, and a common-mode inductance LF 1;
the soft bridge module comprises a fast recovery diode D1, a fast recovery diode D2, a fast recovery diode D3, and a fast recovery diode D4; the anode of the fast recovery diode D1 is connected with the live wire input interface 1; the cathode of the fast recovery diode D1 is connected with the cathode of the fast recovery diode D2; the anode of the fast recovery diode D2 is connected with the cathode of the fast recovery diode D4; the cathode of the fast recovery diode D4 is connected with the zero line input interface 2; the anode of the fast recovery diode D4 is connected with the anode of the fast recovery diode D3; the cathode of the fast recovery diode D3 is connected with the anode of the fast recovery diode D1;
the cathode of the fast recovery diode D1 and the anode of the fast recovery diode D3 are respectively connected with the input end of the PWM module through a common-mode inductor LF 1; and the output end of the PWM module is respectively connected with the positive output interface 3 and the negative output interface 4 through the output module.
Specifically, in the power adapter for reducing the common-mode inductance described in this embodiment, after the ac power is input from the live line input interface 1 and the zero line input interface 2, the ac power is rectified by the soft bridge module and enters the PWM pulse width modulation module after the common-mode interference is suppressed by the common-mode inductance LF1, the PWM pulse width modulation module performs pulse width modulation and then transmits the PWM pulse width modulation to the output module, and the output module outputs the voltage after voltage stabilization to supply power to the load.
Because the soft bridge module is adopted in this embodiment, that is, bridge rectification is formed by the fast recovery diode D1, the fast recovery diode D2, the fast recovery diode D3 and the fast recovery diode D4, the fast recovery diode D1, the fast recovery diode D2, the fast recovery diode D3 and the fast recovery diode D4 of the soft bridge module perform reverse recovery for a period of time, fast recovery can be performed, the current change rate of the circuit is reduced, harmonic current oscillation generated in a loop is greatly reduced, a common mode inductor LF1 with a small inductance and a small volume can be selected, and miniaturization of the adapter is facilitated.
In the power adapter for reducing common mode inductance according to this embodiment, the PWM pulse width modulation module includes a PWM control chip U1 and a transformer T1; the transformer comprises a primary winding 51, a secondary winding 52 and an auxiliary winding 53;
the PWM control chip U1 is connected with the auxiliary winding 53; the soft bridge module is connected with the primary winding 51 through a common-mode inductor LF 1; the secondary winding 52 is connected to the output module.
Specifically, the model of the PWM control chip U1 may be LY9525, and the internal circuit of the chip has the functions of overvoltage and undervoltage protection and low standby power consumption, so as to effectively protect the power supply.
In the power adapter for reducing the common-mode inductance according to this embodiment, the power adapter for reducing the common-mode inductance further includes a feedback module; the feedback module comprises an optocoupler transmitter U2B, an optocoupler receiver U2A, a voltage regulator tube U3 and a voltage division resistor R12; one end of the voltage dividing resistor R12 is connected with the positive output interface 3; the other end of the divider resistor R12 is connected with the cathode of a voltage regulator tube U3 through an optocoupler emitter U2B; the anode of the voltage regulator tube U3 is grounded; and the optical coupler receiver U2A is connected with the PWM control chip U1.
Specifically, when the voltage of positive output interface 3 and negative output interface 4 changes, opto-coupler transmitter U2B can launch light, and opto-coupler receiver U2A receives light trigger switch and sends signal to PWM control chip U1, and PWM control chip U1 changes the purpose of PWM pulse width thereby reaching the regulation voltage.
In the power adapter for reducing the common-mode inductance according to this embodiment, the output module includes a zener diode D3, a capacitor C6, a capacitor EC4, and a capacitor EC 5; the capacitor C6, the capacitor EC4 and the capacitor EC5 are connected in parallel; the capacitor C6, the capacitor EC4 and the capacitor EC5 are arranged between the positive output interface 3 and the negative output interface 4; the anode of the voltage-stabilizing diode D3 is connected with the secondary winding 52; the cathode of the zener diode D3 is connected to the positive output interface 3.
Specifically, the output module has the functions of voltage stabilization, rectification and filtering through the arrangement.
The power adapter for reducing the common-mode inductance further includes a capacitor EC1 and a capacitor EC 2; the capacitor EC1 is arranged between the soft bridge module and the common-mode inductor LF 1; the capacitor EC2 is arranged between the common-mode inductor LF1 and the PWM module.
Specifically, through the arrangement, the soft bridge module, the capacitor EC1, the capacitor EC2 and the common-mode inductor LF1 form an EMI rectifying and filtering circuit, and power grid conducted interference can be effectively prevented.
In the power adapter for reducing the common mode inductance according to the embodiment, a fuse F1 is arranged between the anode of the fast recovery diode D1 and the live input interface 1. In the power adapter for reducing the common-mode inductance according to this embodiment, a voltage dependent resistor MOV1 is disposed between the fuse F1 and the neutral input interface 2.
Specifically, the voltage dependent resistor MOV1 and the protective tube F2 form a high lightning stroke resistance circuit, common mode lightning stroke and differential mode lightning stroke of more than 6.5KV can be resisted, service equipment is effectively prevented from being damaged by the lightning stroke, and the lightning stroke can be effectively released.
In the power adapter for reducing the common-mode inductance according to the embodiment, the thermistor NTC1 is arranged between the cathode of the fast recovery diode D3 and the neutral input interface 2.
Specifically, the thermistor NTC1 can be used to reduce input inrush current and prevent the L-N input mains supply from entering a large peak current to damage the subsequent circuit components at the moment of startup.
It should be finally noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit the scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. A power adapter for reducing common mode inductance, comprising: the device comprises a live wire input interface (1), a zero line input interface (2), a positive output interface (3), a negative output interface (4), a soft bridge module, a PWM (pulse width modulation) module, an output module and a common-mode inductor LF 1;
the soft bridge module comprises a fast recovery diode D1, a fast recovery diode D2, a fast recovery diode D3, and a fast recovery diode D4; the anode of the fast recovery diode D1 is connected with the live wire input interface (1); the cathode of the fast recovery diode D1 is connected with the cathode of the fast recovery diode D2; the anode of the fast recovery diode D2 is connected with the cathode of the fast recovery diode D4; the cathode of the fast recovery diode D4 is connected with the zero line input interface (2); the anode of the fast recovery diode D4 is connected with the anode of the fast recovery diode D3; the cathode of the fast recovery diode D3 is connected with the anode of the fast recovery diode D1;
the cathode of the fast recovery diode D1 and the anode of the fast recovery diode D3 are respectively connected with the input end of the PWM module through a common-mode inductor LF 1; and the output end of the PWM module is respectively connected with the positive output interface (3) and the negative output interface (4) through the output module.
2. A power adapter for reducing common mode inductance according to claim 1, wherein: the PWM module comprises a PWM control chip U1 and a transformer T1; the transformer comprises a primary winding (51), a secondary winding (52) and an auxiliary winding (53);
the PWM control chip U1 is connected with an auxiliary winding (53); the soft bridge module is connected with the primary winding (51) through a common-mode inductor LF 1; the secondary winding (52) is connected with the output module.
3. A power adapter for reducing common mode inductance according to claim 2, wherein: the power adapter for reducing common mode inductance further comprises a feedback module; the feedback module comprises an optical coupler transmitter U2B, an optical coupler receiver U2A, a voltage regulator tube U3 and a voltage dividing resistor R12; one end of the voltage dividing resistor R12 is connected with the positive output interface (3); the other end of the divider resistor R12 is connected with the cathode of a voltage regulator tube U3 through an optocoupler emitter U2B; the anode of the voltage regulator tube U3 is grounded; and the optical coupler receiver U2A is connected with the PWM control chip U1.
4. A power adapter for reducing common mode inductance according to claim 2, wherein: the output module comprises a voltage stabilizing diode D3, a capacitor C6, a capacitor EC4 and a capacitor EC 5; the capacitor C6, the capacitor EC4 and the capacitor EC5 are connected in parallel; the capacitor C6, the capacitor EC4 and the capacitor EC5 are arranged between the positive output interface (3) and the negative output interface (4); the anode of the voltage-stabilizing diode D3 is connected with the secondary winding (52); the cathode of the zener diode D3 is connected to the positive output interface (3).
5. A power adapter for reducing common mode inductance according to claim 1, wherein: the power adapter for reducing the common-mode inductance further comprises a capacitor EC1 and a capacitor EC 2; the capacitor EC1 is arranged between the soft bridge module and the common-mode inductor LF 1; the capacitor EC2 is arranged between the common-mode inductor LF1 and the PWM module.
6. A power adapter for reducing common mode inductance according to claim 1, wherein: and a fuse F1 is arranged between the anode of the fast recovery diode D1 and the live wire input interface (1).
7. A power adapter for reducing common mode inductance according to claim 6, wherein: and a voltage dependent resistor MOV1 is arranged between the fuse tube F1 and the neutral line input interface (2).
8. A power adapter for reducing common mode inductance according to claim 1, wherein: and a thermistor NTC1 is arranged between the cathode of the fast recovery diode D3 and the zero line input interface (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221502101.5U CN217445242U (en) | 2022-06-15 | 2022-06-15 | Power adapter for reducing common-mode inductance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221502101.5U CN217445242U (en) | 2022-06-15 | 2022-06-15 | Power adapter for reducing common-mode inductance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217445242U true CN217445242U (en) | 2022-09-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221502101.5U Active CN217445242U (en) | 2022-06-15 | 2022-06-15 | Power adapter for reducing common-mode inductance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217445242U (en) |
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2022
- 2022-06-15 CN CN202221502101.5U patent/CN217445242U/en active Active
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