CN203039574U - Power supply circuit capable of solving problem of grounding system common-mode lightning stroke restart - Google Patents
Power supply circuit capable of solving problem of grounding system common-mode lightning stroke restart Download PDFInfo
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- CN203039574U CN203039574U CN 201220664740 CN201220664740U CN203039574U CN 203039574 U CN203039574 U CN 203039574U CN 201220664740 CN201220664740 CN 201220664740 CN 201220664740 U CN201220664740 U CN 201220664740U CN 203039574 U CN203039574 U CN 203039574U
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Abstract
The utility model provides a power supply circuit capable of solving the problem of grounding system common-mode lightning stroke restart. The power supply circuit comprises an input electromagnetic interference suppression circuit, an input rectification/filtering circuit, a transformer conversion circuit, an output rectification/filtering circuit and an output electromagnetic interference suppression circuit which are connected sequentially, wherein the output electromagnetic interference suppression circuit includes a Y capacitor and common-mode chokes; the Y is connected in series between the primary side and the secondary side of the transformer conversion circuit, and at the same time, a secondary output end of the transformer conversion circuit is connected with a ground wire connection point; and the common-mode chokes are connected with an output end of the power supply circuit. According to the power supply circuit of the embodiment of the utility model, based on a switch power supply circuit in the prior art, a ground wire is connected at a position in front of one output common-mode choke, such that the output common-mode choke can prevent common-mode lightning stroke simultaneously; at the same time, output adopts two levels of common mode chokes; lightning stroke interference voltage spike can be suppressed more forcedly through the two levels of common mode chokes; and through the control of the values of the Y capacitor, common-mode lightning stroke can be effectively prevented, and at the same time, electromagnetic interference can be suppressed.
Description
Technical field
The utility model relates to the switch power technology field, relates in particular to a kind of power circuit that the thunderbolt of grounding system common mode is restarted that solves.
Background technology
Be illustrated in figure 1 as common I class switching power circuit figure, its structure comprises the input electromagnetic interference suppression circuit, the input rectifying filter circuit, the transformer change-over circuit, ON-OFF control circuit, output rectifier and filter and output electromagnetic interference suppression circuit, the voltage sample feedback circuit, electromagnetic interference suppression circuit can be used Y capacitor C Y1 and output common mode inductance element usually.Since more and more to the thunderbolt performance demands now, how to solve the thunderbolt performance and become an important problem, and problem can appear restarting when the thunderbolt of grounding system common mode particularly often occurring.For some electronic equipments (refrigerator, washing machine, air-conditioning, part gateway product etc.), its power supply is general adopts ground connection to design, and namely connects the earth.Therefore, this system relates to the thunderbolt performance issue.
The typical electromagnetic interference suppression circuit of Switching Power Supply is used Y capacitor C Y1; when live wire L and the ground wire of zero line N (FG) generation thunderbolt; the high-voltage large current pulse that thunderbolt produces is delivered to output by Y capacitor C Y1; cause output voltage to produce very high spike; this spike to PWM chip U1 feeder ear, restarts chip U1 overvoltage protection by transformer coupled.
Summary of the invention
The purpose of this utility model is to provide a kind of power circuit that the thunderbolt of grounding system common mode is restarted that solves, with the thunderbolt of protection common mode.
The purpose of this utility model is achieved through the following technical solutions:
A kind ofly solve the power circuit that grounding system common mode thunderbolt is restarted, comprise the input electromagnetic interference suppression circuit, input rectifying filter circuit, transformer change-over circuit, output rectifier and filter and the output electromagnetic interference suppression circuit that connect successively, the input electromagnetic interference suppression circuit is connected to live wire contact and the zero line contact that exchanges the input electricity, and described electromagnetic interference suppression circuit comprises Y electric capacity and common mode inductance; Described Y capacitances in series is between the primary and secondary of transformer translation circuit, and the secondary output end of transformer change-over circuit connects the ground wire contact simultaneously, and described common mode inductance is connected to the output of this power circuit.
Wherein, described common mode inductance comprises first order common mode inductance and the second level common mode inductance of series connection.
Wherein, the capacitance C of described Y electric capacity≤470pF.
Compared with prior art, the utility model embodiment has following beneficial effect:
The utility model embodiment is before receiving the output common mode inductance with ground wire on the existing switching power circuit basis, allow the output common mode inductance can play the thunderbolt of protection common mode simultaneously, the two-stage common mode inductance is adopted in output simultaneously, strengthen inhibition thunderbolt interference voltage spike by the two-stage common mode inductance, in addition by controlling the value of Y electric capacity, not only can effectively protect the common mode thunderbolt, and play the electromagnetic interference effect that suppresses.
Description of drawings
Fig. 1 is traditional I class switching power circuit figure.
Fig. 2 is the switching power circuit figure that solved grounding system common mode thunderbolt that the utility model embodiment provides is restarted.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in restriction the utility model.
See also shown in Figure 2ly, in the present embodiment, on the basis of traditional switch power circuit shown in Figure 1, ground wire (FG) is received before the common mode inductance LG2, increased the one-level common mode inductance again at output simultaneously, control value C≤470pF of Y capacitor C Y1 in addition.
Between the primary and secondary of transformer, be connected in series CY1 electric capacity, formed the bang path of common mode thunderbolt interference signal.When the common mode thunderbolt takes place, interference signal is coupled to secondary output end by Y capacitor C Y1, when Y capacitor C Y1 value more little, it is just more little to be coupled to secondary energy, the due to voltage spikes that produces at output is just more little like this, so need the value of control Y capacitor C Y1 to reduce common mode thunderbolt interference signal spike; Ground wire (FG) is received before the common mode inductance LG2, when the common mode thunderbolt takes place when, be coupled to secondary interference spike by Y capacitor C Y1 and just can pass through LG2, LG3 two-stage common mode inductance filtering part spike, common mode inductance not only plays the electromagnetic interference effect that suppresses like this, can also effectively protect the common mode thunderbolt, play the effect of one-object-many-purposes.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (3)
1. one kind can solve the power circuit that the thunderbolt of grounding system common mode is restarted, comprise the input electromagnetic interference suppression circuit, input rectifying filter circuit, transformer change-over circuit, output rectifier and filter and the output electromagnetic interference suppression circuit that connect successively, the input electromagnetic interference suppression circuit is connected to live wire contact and the zero line contact that exchanges the input electricity, and described output electromagnetic interference suppression circuit comprises Y electric capacity and common mode inductance; It is characterized in that,
Described Y capacitances in series is between the primary and secondary of transformer translation circuit, and the secondary output end of transformer change-over circuit connects the ground wire contact simultaneously, and described common mode inductance is connected to the output of this power circuit.
2. can solve the power circuit that the thunderbolt of grounding system common mode is restarted according to claim 1, it is characterized in that described common mode inductance comprises first order common mode inductance and the second level common mode inductance of series connection.
3. can solve the power circuit that the thunderbolt of grounding system common mode is restarted as claimed in claim 1 or 2, it is characterized in that the capacitance C of described Y electric capacity≤470pF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220664740 CN203039574U (en) | 2012-12-06 | 2012-12-06 | Power supply circuit capable of solving problem of grounding system common-mode lightning stroke restart |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220664740 CN203039574U (en) | 2012-12-06 | 2012-12-06 | Power supply circuit capable of solving problem of grounding system common-mode lightning stroke restart |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203039574U true CN203039574U (en) | 2013-07-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220664740 Expired - Lifetime CN203039574U (en) | 2012-12-06 | 2012-12-06 | Power supply circuit capable of solving problem of grounding system common-mode lightning stroke restart |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203039574U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107800199A (en) * | 2016-08-30 | 2018-03-13 | 宁波微鹅电子科技有限公司 | A kind of electromagnetic interference suppression circuit and electric energy transmitting terminal |
| CN109171606A (en) * | 2018-08-29 | 2019-01-11 | 合肥德易电子有限公司 | Intelligent integral robot cavity mirror system |
| CN109363613A (en) * | 2018-08-29 | 2019-02-22 | 合肥德铭电子有限公司 | Inhibit the intelligent movable integration cavity mirror system of function with electromagnetism |
| CN109363735A (en) * | 2018-08-29 | 2019-02-22 | 合肥德铭电子有限公司 | Configure the integrated cavity mirror system of electromagnetism suppression circuit |
| CN116054574A (en) * | 2022-07-07 | 2023-05-02 | 荣耀终端有限公司 | Switching power supply circuit, power adapter and electronic equipment |
-
2012
- 2012-12-06 CN CN 201220664740 patent/CN203039574U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107800199A (en) * | 2016-08-30 | 2018-03-13 | 宁波微鹅电子科技有限公司 | A kind of electromagnetic interference suppression circuit and electric energy transmitting terminal |
| CN109171606A (en) * | 2018-08-29 | 2019-01-11 | 合肥德易电子有限公司 | Intelligent integral robot cavity mirror system |
| CN109363613A (en) * | 2018-08-29 | 2019-02-22 | 合肥德铭电子有限公司 | Inhibit the intelligent movable integration cavity mirror system of function with electromagnetism |
| CN109363735A (en) * | 2018-08-29 | 2019-02-22 | 合肥德铭电子有限公司 | Configure the integrated cavity mirror system of electromagnetism suppression circuit |
| CN116054574A (en) * | 2022-07-07 | 2023-05-02 | 荣耀终端有限公司 | Switching power supply circuit, power adapter and electronic equipment |
| CN116054574B (en) * | 2022-07-07 | 2024-10-11 | 荣耀终端有限公司 | Switching power supply circuit, power adapter and electronic equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130703 |
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| CX01 | Expiry of patent term |