CN202406042U

CN202406042U - All-in-one PC inbuilt switch power supply

Info

Publication number: CN202406042U
Application number: CN2011204545292U
Authority: CN
Inventors: 傅新舵
Original assignee: WUHAN LIGHT ENERGY TECHNOLOGY CO LTD
Current assignee: WUHAN LIGHT ENERGY TECHNOLOGY CO LTD
Priority date: 2011-11-16
Filing date: 2011-11-16
Publication date: 2012-08-29
Anticipated expiration: 2021-11-16

Abstract

The present utility model relates to an all-in-one PC inbuilt switch power supply. The power supply comprises an EMI processing circuit, a primary rectification filter circuit, a PFC power factor correcting circuit, a half-bridge control drive circuit, a high-frequency transformer converting circuit and a secondary rectification filter circuit which are successively connected, the output end of the secondary rectification filter circuit is connected with a load; the EMI processing circuit comprises two common mode inductance coils and two differential mode inductors, and an AC power supply is connected with two input ends of the first common mode inductance coil after passing through a capacitance-resistance filtering network, is respectively led into the two differential mode inductors after passing through the second common mode inductance coil, a capacitor and a resistor, and output to an AC-DC converting device to be converted into a DC power supply and output. The power supply is concise in circuit, especially the EMI processing circuit can be used for inhibiting noise interferences of the whole frequency domain, thus alternating current can be transmitted to power supply equipment without attenuation, noise interferences generated by the power supply can be effectively inhibited, and electromagnetic compatibility of the power supply can be enhanced.

Description

Computer all-in-one machine built-in switch power supply

Technical field

The utility model relates to a kind of built-in power technical field, especially relates to a kind of computer all-in-one machine built-in switch power supply.

Background technology

Along with developing by leaps and bounds of electronic technology, various electronic products are more and more to the miniaturization development, and this has brought difficulty for the design of power module with regard to the also corresponding miniaturization of the power module in the corresponding requirements electronic product.The power module of the main frame of developing at present and the computer all-in-one machine of display one be designed with two kinds: a kind of is to the same power supply adaptor that adopts of notebook computer it to be carried out powered operation; A kind of is that power module is built in the computer all-in-one machine, its more convenient application.But power module is built in the computer all-in-one machine, higher to the volume requirement and the Electro Magnetic Compatibility requirement of power module.

Summary of the invention

The problem that the utility model need solve provides the computer all-in-one machine built-in switch power supply that a kind of circuit is succinct and Electro Magnetic Compatibility is good.

For addressing the above problem; The technical scheme that the utility model is taked is: a kind of computer all-in-one machine built-in switch power supply; It comprises successively the EMI treatment circuit that connects, current rectifying and wave filtering circuit, PFC power factor correction circuit, half-bridge control Driver Circuit, high frequency transformer change-over circuit, secondary current rectifying and wave filtering circuit; EMI treatment circuit input is connected with AC power; Said EMI treatment circuit comprises common mode inductance coil T1, T2 and differential mode inductance L2, L3; AC power inserts common mode inductance coil T1 two inputs behind the capacitance-resistance filter network; Common mode inductance coil T1 two outputs are connected with common mode inductance coil T2 two inputs after capacitor C X3 filtering, and common mode inductance coil T2 two outputs are connected with differential mode inductance L3 input with differential mode inductance L2 respectively after capacitor C X4, resistance R 3 filtering, and differential mode inductance L2 is connected with a current rectifying and wave filtering circuit with differential mode inductance L3 two outputs.

As preferably, be serially connected with capacitor C 1, C2 between said differential mode inductance L2 and differential mode inductance L3 two outputs, the points of common connection ground connection between capacitor C 1, the C2.

As preferably, said capacitance-resistance filter network comprises filter capacitor CX1, CX2, resistance R 1, R2, and wherein filter capacitor CX1, CX2 are connected in common mode inductance coil T1 two inputs after side by side, are connected in common mode inductance coil T1 two inputs after resistance R 1, the R2 series connection.

As preferably, said Switching Power Supply also comprises the sample circuit that is connected between secondary rectification filter circuit output end and the half-bridge control Driver Circuit.

Compared with prior art, the said power circuit of the utility model is succinct, and specially designed EMI treatment circuit can effectively suppress the common mode disturbances of high frequency and the DM EMI of low frequency, can also two-way inhibition electromagnetic interference noise, thus purify electrical network.

Description of drawings

Fig. 1 is the utility model schematic block circuit diagram;

Fig. 2 is an EMI treatment circuit principle schematic shown in Figure 1.

Embodiment

Below in conjunction with embodiment and accompanying drawing the utility model is done further to specify.

As shown in Figure 1, the built-in switch power circuit that the utility model disclosed mainly comprises EMI treatment circuit, PFC power factor correction circuit, current rectifying and wave filtering circuit, half-bridge control Driver Circuit, high frequency transformer change-over circuit, sample circuit etc.EMI treatment circuit input is connected with AC power; AC power is earlier through the EMI processing circuit processes; Carry out power factor correction through a current rectifying and wave filtering circuit filtering, PFC circuit of power factor correction then; Export to half-bridge control Driver Circuit (having overvoltage protection, overcurrent protection, overheat protector) again and convert the low-frequency power signal into to the high frequency transformer change-over circuit, this power supply signal is exported each the functional module work of power supply brain after the rectification of secondary current rectifying and wave filtering circuit is direct voltage.Sample circuit is also to feeding back to the half-bridge control Driver Circuit after the sampling of VD current conditions in addition.

As shown in Figure 2, in the built-in switch power circuit, said EMI treatment circuit mainly plays the effect that improves Electro Magnetic Compatibility.The EMI treatment circuit comprises common mode inductance coil T1, T2, resistance R 1, R2, R3, capacitor C X1, CX2, CX3, C1, C2, differential mode inductance L2, L3, capacitor C X4.Wherein filter capacitor CX1, CX2 are connected in common mode inductance coil T1 two inputs after side by side, are connected in common mode inductance coil T1 two inputs after resistance R 1, the R2 series connection.The two-terminal of AC power is through capacitor C X1, CX2; Be connected with common mode inductance coil T1 two inputs respectively behind the capacitance-resistance filter network filtering that resistance R 1, R2 constitute; Common mode inductance coil T1 two outputs are connected with common mode inductance coil T2 two inputs after capacitor C X3 filtering; Common mode inductance coil T2 two outputs are connected with differential mode inductance L3 input with differential mode inductance L2 respectively after capacitor C X4, resistance R 3 filtering; Be serially connected with capacitor C 1, C2 between differential mode inductance L2 and differential mode inductance L3 two outputs, the points of common connection ground connection between capacitor C 1, the C2.Differential mode inductance L2 is connected with a current rectifying and wave filtering circuit with differential mode inductance L3 two outputs.

Resistance R 1, R2, R3 and capacitor C X1, CX2, CX3, C1, C2 constitute the low pass filter between the separate port on the interchange inlet wire, but the common mode disturbances noise on the damped alternating current inlet wire stops it to get into power-supply device; And differential mode inductance L2, L3 and capacitor C X4 constitute differential mode noise inhibition circuit, constitute to exchange the low pass filter between the separate port on the inlet wire, can suppress to exchange the DM EMI noise on the inlet wire, prevent that power-supply device is interfered.

The said built-in switch power supply of the utility model is a kind of four-way passive network; It can suppress the noise jamming of full frequency-domain simultaneously; Make the zero-decrement power-supply device that is transferred to of alternating current, can effectively suppress the noise jamming that power supply itself produces simultaneously again, improve the Electro Magnetic Compatibility of power supply itself.

Need to prove, more than be merely the utility model preferred embodiment, do not breaking away under the utility model design prerequisite any impartial protection range of in the prior art scope, the utility model circuit being done that all belongs to the utility model with modification that changes.

Claims

1. computer all-in-one machine built-in switch power supply; It comprises successively the EMI treatment circuit that connects, current rectifying and wave filtering circuit, PFC power factor correction circuit, half-bridge control Driver Circuit, high frequency transformer change-over circuit, secondary current rectifying and wave filtering circuit; EMI treatment circuit input is connected with AC power; It is characterized in that said EMI treatment circuit comprises common mode inductance coil T1, T2 and differential mode inductance L2, L3; AC power inserts common mode inductance coil T1 two inputs behind the capacitance-resistance filter network; Common mode inductance coil T1 two outputs are connected with common mode inductance coil T2 two inputs after capacitor C X3 filtering; Common mode inductance coil T2 two outputs are connected with differential mode inductance L3 input with differential mode inductance L2 respectively after capacitor C X4, resistance R 3 filtering, and differential mode inductance L2 is connected with a current rectifying and wave filtering circuit with differential mode inductance L3 two outputs.

2. computer all-in-one machine built-in switch power supply according to claim 1 is characterized in that being serially connected with capacitor C 1, C2 between said differential mode inductance L2 and differential mode inductance L3 two outputs, the points of common connection ground connection between capacitor C 1, the C2.

3. computer all-in-one machine built-in switch power supply according to claim 2; It is characterized in that said capacitance-resistance filter network comprises filter capacitor CX1, CX2; Resistance R 1, R2; Wherein filter capacitor CX1, CX2 are connected in common mode inductance coil T1 two inputs after side by side, are connected in common mode inductance coil T1 two inputs after resistance R 1, the R2 series connection.

4. computer all-in-one machine built-in switch power supply according to claim 3 is characterized in that said Switching Power Supply also comprises the sample circuit that is connected between secondary rectification filter circuit output end and the half-bridge control Driver Circuit.