CN204993067U - 5W does not have high energy efficiency switching power supply of Y electric capacity - Google Patents
5W does not have high energy efficiency switching power supply of Y electric capacity Download PDFInfo
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- CN204993067U CN204993067U CN201520595355.XU CN201520595355U CN204993067U CN 204993067 U CN204993067 U CN 204993067U CN 201520595355 U CN201520595355 U CN 201520595355U CN 204993067 U CN204993067 U CN 204993067U
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Abstract
The utility model discloses a 5W does not have high energy efficiency switching power supply of Y electric capacity, it is including the input rectifier circuit, EMI filter circuit, voltage conversion circuit and the secondary rectification filter circuit that connect gradually, voltage conversion circuit includes transformer TR1, former limit driver chip U1, bleeder circuit and surge snubber circuit, transformer TR1 includes primary side winding, auxiliary winding and vice limit winding, former limit driver chip U1 is chip MD1810, surge snubber circuit connects between first end and third end. The utility model discloses a cooperation with chip MD1810 and peripheral circuit and transformer has realized the high efficiency, and efficiency by inputoutput test 74.83% can satisfy batch production totally, with the present method of using the electric capacity of the diode of low pressure drop, low internal resistance and strengthening the output line footpath, more has the cost advantage.
Description
Technical field
The utility model relates to a kind of anti-theft technique of slide fastener, refers more particularly to the high energy efficiency Switching Power Supply of the 5W no Y capacitance based on Hall element.
Background technology
For reducing electric power energy consumption further, reduce power station greenhouse gas emission, the mechanisms such as u.s. department of energy (DOE) and EU Committee have issued the energy-conservation new standard of external electric source, intend carrying out within the coming years.In new standard, the power energy valid value of below 30W is than current standard height 4-6% point.For 5V1A Switching Power Supply, primary standard 68.17%, new standard is 73.77%, and new standard improves nearly 5.6%.So, then need to carry out circuit optimization to existing Switching Power Supply, to reach the object improving power energy valid value, simultaneously, the surplus of the EMI ensureing Switching Power Supply is also needed to reach 6DB surplus, the method realization that power energy valid value is the low pressure drop diode by using high cost, low internal resistance electric capacity and increasing output wire diameter is improved in prior art, although these modes can realize the raising of power efficiency to a certain extent, but enlarged relative production cost, but also differ and reach the regulation of new standard surely.
Utility model content
For above deficiency, the utility model aims to provide a kind of high energy efficiency Switching Power Supply of 5W no Y capacitance, and its filter circuit, without use Y capacitance, realizes by the design of chip MD1810 and peripheral circuit the object improving power energy valid value, meanwhile, EMI surplus also can reach 6DB surplus.
For solving the problem, the technical scheme that the utility model is taked is:
A kind of high energy efficiency Switching Power Supply of 5W no Y capacitance, it comprises input rectification circuit, EMI filter circuit, voltage conversion circuit and secondary commutation filter circuit, wherein, the input of described input rectification circuit is connected on civil power, its output passes through EMI filter circuit successively, voltage conversion circuit is connected to secondary commutation filter circuit, described voltage conversion circuit comprises transformer TR1, former limit driving chip U1, bleeder circuit and surge absorbing circuit, described transformer TR1 comprises former limit winding, auxiliary winding and vice-side winding, wherein, the two ends of former limit winding are labeled as first end and the 3rd end respectively, the two ends of auxiliary winding are labeled as the 4th end and five terminal respectively, the two ends of vice-side winding are labeled as the 6th end and the 7th end respectively, described 3rd end, five terminal and the 6th end are Same Name of Ends, described former limit driving chip U1 is chip MD1810, first end is connected to the output of EMI filter circuit, one end of described bleeder circuit is connected between the output of EMI filter circuit and first end, the other end of bleeder circuit is divided into two tunnels, wherein a road is connected with the power end VCC of chip MD1810, and another road is connected to five terminal by resistance R9 and diode D8 successively, described three-terminal link to the high-pressure side HV of chip MD1810, the 4th end and the 7th end ground connection, six end connecting is to the input of secondary commutation filter circuit, the feedback end FB of chip MD1810 is connected between sampling resistor R2 and sampling resistor R3, the other end of sampling resistor R2 is connected between diode D8 and five terminal, the other end ground connection of sampling resistor R3, the sheet choosing end CS of chip MD1810 is by resistance R4 ground connection, and the voltage-drop compensation end CPC of chip MD1810 is by electric capacity C2 ground connection, described surge absorbing circuit is connected between first end and the 3rd end.
Described input rectification circuit is full-wave rectifying circuit.
Described EMI filter circuit comprises electrochemical capacitor EC1, electrochemical capacitor EC2, inductance L 1, inductance L 2, one end of inductance L 1 and the positive pole of electrochemical capacitor EC1 are all connected to the output of full-wave rectifying circuit, the other end of inductance L 1 and the negative pole of electrochemical capacitor EC1 are respectively by electrochemical capacitor EC2 and inductance L 2 ground connection, and first end is connected between the positive pole of electrochemical capacitor EC2 and inductance L 1.
Described surge absoption short circuit comprises resistance R1, electric capacity C3, diode D5 and resistance R5, and the two ends after described resistance R1, diode D5 and resistance R5 connect successively are connected to first end and the 3rd end respectively, and described electric capacity C3 is connected on resistance R1.
Described bleeder circuit comprises resistance R7 and resistance R8, forms the two ends of bleeder circuit after described resistance R7 and resistance R8 connects.
One end of described resistance R8 is connected between first end and the output of EMI filter circuit by resistance R7, the other end of resistance R8 is connected to five terminal by resistance R9 and diode D8, described voltage conversion circuit comprises an electrolytic capacitor filter EC4 further, the positive pole of described electrolytic capacitor filter EC4 is connected between resistance R8 and resistance R9, its minus earth.
The two ends of described sampling resistor R3 also meet an electric capacity C4.
Described secondary commutation filter circuit comprises rectifier diode D7, electrochemical capacitor EC3, electrochemical capacitor EC5 and resistance R11, one end after described electrochemical capacitor EC3, electrochemical capacitor EC5 and resistance R11 parallel connection is connected to the 6th end by diode D7, the other end after parallel connection is connected to the 7th end, and the positive pole of described electrochemical capacitor EC3, electrochemical capacitor EC5 is all connected to the negative pole of diode D7.
Described secondary commutation filter circuit comprises a peak absorbing circuit further, and described peak absorbing circuit comprises resistance R16 and electric capacity C1, and the two ends after described resistance R16 and electric capacity C1 connects are connected to the two ends of diode D7 respectively.
The high energy efficiency Switching Power Supply of the 5W no Y capacitance that the utility model is set forth, compared with prior art, its beneficial effect is:
1, by coordinating with chip MD1810 and peripheral circuit and transformer, achieve high efficiency, if efficiency by inputoutput test 74.83%(exports wire rod 24AWG, 1200mm efficiency also can up to 2%), batch production can be met completely, with the diode of existing use low pressure drop, the electric capacity of low internal resistance and strengthen the method exporting wire diameter, more there is cost advantage;
2, in EMI, also eliminate Y capacitance, but the surplus of EMI also has 6DB;
3, add surge absorbing circuit and peak absorbing circuit, maximum protective effect is played to Switching Power Supply of the present utility model.
Accompanying drawing explanation
Accompanying drawing 1 is the circuit theory diagrams of the high energy efficiency Switching Power Supply of a kind of 5W no Y capacitance of the utility model.
Embodiment
Below, by reference to the accompanying drawings and embodiment, the high energy efficiency Switching Power Supply of 5W no Y capacitance of the present utility model is described further, understands the utility model technological thought required for protection so that clearer.
A kind of high energy efficiency Switching Power Supply of 5W no Y capacitance, it forms primarily of input rectification circuit, EMI filter circuit, voltage conversion circuit and secondary commutation filter circuit four part, wherein, input rectification circuit, EMI filter circuit, voltage conversion circuit are connected successively with secondary commutation filter circuit, the input of input rectification circuit is connected on civil power, secondary commutation filter circuit is output loading required voltage then, and the utility model can provide the power supply output valve of 5V1A.
Input rectification circuit adopts full-wave rectifying circuit BD1 to realize, EMI filter capacitor adopts no Y capacitance design, it comprises electrochemical capacitor EC1, electrochemical capacitor EC2, inductance L 1, inductance L 2, one end of inductance L 1 and the positive pole of electrochemical capacitor EC1 are all connected to the output of full-wave rectifying circuit, and the other end of inductance L 1 and the negative pole of electrochemical capacitor EC1 are respectively by electrochemical capacitor EC2 and inductance L 2 ground connection.
Voltage conversion circuit mainly comprises transformer TR1, former limit driving chip U1, bleeder circuit and surge absorbing circuit.Transformer TR1 comprises former limit winding, auxiliary winding and vice-side winding, wherein, the two ends of former limit winding are labeled as first end and the 3rd end respectively, the two ends of auxiliary winding are labeled as the 4th end and five terminal respectively, the two ends of vice-side winding are labeled as the 6th end and the 7th end respectively, and the 3rd end, five terminal and the 6th end are Same Name of Ends; The chip MD1810(of former limit driving chip U1 employing MIX company also can be other chips of MIX company MD18xx series).First end is connected between electrochemical capacitor EC2 and inductance L 1, one end of bleeder circuit is connected between inductance L 1 and first end, the other end of bleeder circuit is divided into two tunnels, wherein a road is connected with the power end VCC of chip MD1810, for providing power supply for chip MD1810, another road is connected to five terminal by resistance R9 and diode D8 successively, its input signal auxiliary winding voltage detected as chip MD1810, thus replace existing by the signal feedback of optocoupler realization to Switching Power Supply, improve power energy valid value, and cost is increased less than 1%.Three-terminal link is to the high-pressure side HV of chip MD1810, and the 4th end and the 7th end ground connection, six end connecting is to the input of secondary commutation filter circuit.
The feedback end FB of chip MD1810 is connected between sampling resistor R2 and sampling resistor R3, the other end of sampling resistor R2 is connected between diode D8 and five terminal, the other end ground connection of sampling resistor R3, the two ends of sampling resistor R3 also meet an electric capacity C4, the sheet choosing end CS of chip MD1810 is by resistance R4 ground connection, the voltage-drop compensation end CPC of chip MD1810 passes through electric capacity C2 ground connection (by the built-in line drop compensation circuit realiration of chip MD1810, when exporting different loads, line drop compensation circuit provides line drop voltage compensation to be fixed the output voltage of ratio, internal circuit is greater than 100nF at voltage-drop compensation end CPC with electric capacity C2(capacitance) be connected generation line voltage distribution decline compensating signal), surge absorbing circuit is connected between first end and the 3rd end.
Surge absoption short circuit comprises resistance R1, electric capacity C3, diode D5 and resistance R5, and the two ends after resistance R1, diode D5 and resistance R5 connect successively are connected to first end and the 3rd end respectively, and electric capacity C3 is connected on resistance R1.Bleeder circuit comprises resistance R7 and resistance R8, the two ends of bleeder circuit are formed after resistance R7 and resistance R8 connects, in the utility model, one end of resistance R8 is connected between first end and the output of EMI filter circuit by resistance R7, the other end of resistance R8 is connected to five terminal by resistance R9 and diode D8, voltage conversion circuit also comprises electrolytic capacitor filter EC4, and the positive pole of electrolytic capacitor filter EC4 is connected between resistance R8 and resistance R9, its minus earth.
Secondary commutation filter circuit comprises rectifier diode D7, electrochemical capacitor EC3, electrochemical capacitor EC5, peak absorbing circuit and resistance R11, one end after electrochemical capacitor EC3, electrochemical capacitor EC5 and resistance R11 parallel connection is connected to the 6th end by diode D7, the other end after parallel connection is connected to the 7th end, the positive pole of electrochemical capacitor EC3, electrochemical capacitor EC5 is all connected to the negative pole of diode D7, peak absorbing circuit comprises resistance R16 and electric capacity C1, and the two ends after resistance R16 and electric capacity C1 connects are connected to the two ends of diode D7 respectively.
Its operation principle is:
1, when circuit working is at constant voltage mode, when the feedback end FB of chip MD1810 detects output voltage, be the shutoff of the power transistor by the induced voltage and control chip MD1810 inside detecting auxiliary winding, thus make output voltage stabilization in fixing value.When diode D7 conducting, certain relation (corresponding relation namely between voltage and umber of turn is there is between the voltage of vice-side winding and auxiliary winding, the two is roughly proportional), thus, the feedback end FB of chip MD1810 controls the ON time ratio of power transistor by detecting auxiliary winding voltage thus ensures fixing output voltage.In order to avoid the peak value impact produced when power transistor turns off, consider from the leakage inductance of transformer TR1 and the precision of sampled voltage, increase electrochemical capacitor EC4 and carry out filtering.
2, the duty ratio of chip MD1810 will be adjusted by diode D7 when circuit working is under constant current mode.When diode D7 conducting, former limit winding energy will be converted to vice-side winding energy, through diode D7 charging output capacitor and simultaneously offered load.When diode D7 turns off, primary coil storage power output filter capacitor by load discharge in constant current operation region, the switching frequency of chip MD1810 is directly proportional to the output loading by feedback end FB voltage detecting, the peak current of diode D7 determines according to the former limit winding current peak value affecting output current, former limit winding current peak value is according to selecting the resistance R4 holding CS to be connected to determine with sheet, former limit winding current peak value and resistance R4 are inversely proportional to, so only need adjusting resistance R4 to adjust output current (peak current that diode D7 exports).
For a person skilled in the art, according to technical scheme described above and design, other various corresponding change and distortion can be made, and all these change and distortion all should belong within the protection range of the utility model claim.
Claims (9)
1. the high energy efficiency Switching Power Supply of a 5W no Y capacitance, it comprises input rectification circuit, EMI filter circuit, voltage conversion circuit and secondary commutation filter circuit, wherein, the input of described input rectification circuit is connected on civil power, its output passes through EMI filter circuit successively, voltage conversion circuit is connected to secondary commutation filter circuit, it is characterized in that, described voltage conversion circuit comprises transformer TR1, former limit driving chip U1, bleeder circuit and surge absorbing circuit, described transformer TR1 comprises former limit winding, auxiliary winding and vice-side winding, wherein, the two ends of former limit winding are labeled as first end and the 3rd end respectively, the two ends of auxiliary winding are labeled as the 4th end and five terminal respectively, the two ends of vice-side winding are labeled as the 6th end and the 7th end respectively, described 3rd end, five terminal and the 6th end are Same Name of Ends, described former limit driving chip U1 is chip MD1810, first end is connected to the output of EMI filter circuit, one end of described bleeder circuit is connected between the output of EMI filter circuit and first end, the other end of bleeder circuit is divided into two tunnels, wherein a road is connected with the power end VCC of chip MD1810, and another road is connected to five terminal by resistance R9 and diode D8 successively, described three-terminal link to the high-pressure side HV of chip MD1810, the 4th end and the 7th end ground connection, six end connecting is to the input of secondary commutation filter circuit, the feedback end FB of chip MD1810 is connected between sampling resistor R2 and sampling resistor R3, the other end of sampling resistor R2 is connected between diode D8 and five terminal, the other end ground connection of sampling resistor R3, the sheet choosing end CS of chip MD1810 is by resistance R4 ground connection, and the voltage-drop compensation end CPC of chip MD1810 is by electric capacity C2 ground connection, described surge absorbing circuit is connected between first end and the 3rd end.
2. the high energy efficiency Switching Power Supply of 5W no Y capacitance as claimed in claim 1, it is characterized in that, described input rectification circuit is full-wave rectifying circuit.
3. the high energy efficiency Switching Power Supply of 5W no Y capacitance as claimed in claim 2, it is characterized in that, described EMI filter circuit comprises electrochemical capacitor EC1, electrochemical capacitor EC2, inductance L 1, inductance L 2, one end of inductance L 1 and the positive pole of electrochemical capacitor EC1 are all connected to the output of full-wave rectifying circuit, the other end of inductance L 1 and the negative pole of electrochemical capacitor EC1 are respectively by electrochemical capacitor EC2 and inductance L 2 ground connection, and first end is connected between the positive pole of electrochemical capacitor EC2 and inductance L 1.
4. the high energy efficiency Switching Power Supply of 5W no Y capacitance as claimed in claim 1, it is characterized in that, described surge absoption short circuit comprises resistance R1, electric capacity C3, diode D5 and resistance R5, two ends after described resistance R1, diode D5 and resistance R5 connect successively are connected to first end and the 3rd end respectively, and described electric capacity C3 is connected on resistance R1.
5. the high energy efficiency Switching Power Supply of 5W no Y capacitance as claimed in claim 1, it is characterized in that, described bleeder circuit comprises resistance R7 and resistance R8, forms the two ends of bleeder circuit after described resistance R7 and resistance R8 connects.
6. the high energy efficiency Switching Power Supply of 5W no Y capacitance as claimed in claim 5, it is characterized in that, one end of described resistance R8 is connected between first end and the output of EMI filter circuit by resistance R7, the other end of resistance R8 is connected to five terminal by resistance R9 and diode D8, described voltage conversion circuit comprises an electrolytic capacitor filter EC4 further, the positive pole of described electrolytic capacitor filter EC4 is connected between resistance R8 and resistance R9, its minus earth.
7. the high energy efficiency Switching Power Supply of 5W no Y capacitance as claimed in claim 1, is characterized in that, the two ends of described sampling resistor R3 also meet an electric capacity C4.
8. the high energy efficiency Switching Power Supply of 5W no Y capacitance as claimed in claim 1, it is characterized in that, described secondary commutation filter circuit comprises rectifier diode D7, electrochemical capacitor EC3, electrochemical capacitor EC5 and resistance R11, one end after described electrochemical capacitor EC3, electrochemical capacitor EC5 and resistance R11 parallel connection is connected to the 6th end by diode D7, the other end after parallel connection is connected to the 7th end, and the positive pole of described electrochemical capacitor EC3, electrochemical capacitor EC5 is all connected to the negative pole of diode D7.
9. the high energy efficiency Switching Power Supply of 5W no Y capacitance as claimed in claim 8, it is characterized in that, described secondary commutation filter circuit comprises a peak absorbing circuit further, described peak absorbing circuit comprises resistance R16 and electric capacity C1, and the two ends after described resistance R16 and electric capacity C1 connects are connected to the two ends of diode D7 respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520595355.XU CN204993067U (en) | 2015-08-07 | 2015-08-07 | 5W does not have high energy efficiency switching power supply of Y electric capacity |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520595355.XU CN204993067U (en) | 2015-08-07 | 2015-08-07 | 5W does not have high energy efficiency switching power supply of Y electric capacity |
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| CN204993067U true CN204993067U (en) | 2016-01-20 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107579657A (en) * | 2017-09-11 | 2018-01-12 | 深圳市创芯技术有限公司 | One kind is without Y without common mode high energy efficiency power circuit |
| WO2018188132A1 (en) * | 2017-04-11 | 2018-10-18 | 深圳市华星光电技术有限公司 | Transformer circuit and method for decreasing no-load power consumption |
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2015
- 2015-08-07 CN CN201520595355.XU patent/CN204993067U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018188132A1 (en) * | 2017-04-11 | 2018-10-18 | 深圳市华星光电技术有限公司 | Transformer circuit and method for decreasing no-load power consumption |
| CN107579657A (en) * | 2017-09-11 | 2018-01-12 | 深圳市创芯技术有限公司 | One kind is without Y without common mode high energy efficiency power circuit |
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Address after: 518108 The second and third floors of Building B, Zone 2, Dejin Industrial Park, Fuyuan 1st Road, Heping Community, Fuyong Street, Bao'an District, Shenzhen, Guangdong Patentee after: Shenzhen Chuangxin Technology Co.,Ltd. Address before: 518108 The second and third floors of Building B, Zone 2, Dejin Industrial Park, Fuyuan 1st Road, Heping Community, Fuyong Street, Bao'an District, Shenzhen, Guangdong Patentee before: SHENZHEN TRANSIN TECHNOLOGIES Co.,Ltd. |