CN208656633U - Switching Power Supply output filter circuit - Google Patents
Switching Power Supply output filter circuit Download PDFInfo
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- CN208656633U CN208656633U CN201820412091.3U CN201820412091U CN208656633U CN 208656633 U CN208656633 U CN 208656633U CN 201820412091 U CN201820412091 U CN 201820412091U CN 208656633 U CN208656633 U CN 208656633U
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Abstract
The utility model relates to filter circuit technical fields, for the excessively high power demands problem that can not completely send out master control borad IC of power supply ripple range, propose a kind of Switching Power Supply output filter circuit, including the switch power supply output circuit for air purifier, it is characterized in that, it further include capacitor one, one end of the capacitor one connects the first output end of the switch power supply output circuit and as positive pole output end, the other end of the capacitor one connects the second output terminal of the switch power supply output circuit, the capacitance range of the capacitor one is 0.22uF-22uF, preferably, the capacitance of capacitor one is taken as 4.7uF, this Switching Power Supply output filter circuit is suitable for the filtering of the switch power supply output circuit of air cleaning, it can inhibit high frequency carrier, the output ripple of Switching Power Supply can be declined for 10% or less , ensure that requirement of the master control board chip to power supply ripple, the field of switch power suitable for air purifier.
Description
Technical field
The utility model relates to filter circuit technical field, in particular to a kind of Switching Power Supply output filter circuit.
Background technique
With the improvement of living standards with the transformation of consumers' aesthetic idea, various intelligent appliances are successively into thousand
Ten thousand families.What user was of interest to household electrical appliances at this time is not only appearance, and what is be more concerned about is reliability.
The most of Switching Power Supply that can all use to such as 5V, 12V, 24V direct current output of electronics industry at present, with this direct current
Voltage is powered to rear end master control board chip, since the power supply ripple and noise requirements of master control board chip are relatively high, direct current
The ripple and noise of pressure just need to control in a certain range, general to require less than 10%, and even ± 5%.But general switch electricity
For source output par, c by taking 12V output voltage as an example, output voltage ripple noise is essentially 12% or so, can not meet to power supply line
The power demands of the demanding master control board chip of wave.
Utility model content
The technical problem to be solved by the utility model is to overcoming power supply, ripple range is excessively high is unable to satisfy master control board chip
The problem of power reguirements, proposes a kind of Switching Power Supply output filter circuit.
The utility model solves above-mentioned technical problem, the technical solution adopted is that:
Switching Power Supply output filter circuit further includes capacitor including the switch power supply output circuit for air purifier
One, one end of the capacitor one connects the first output end of the switch power supply output circuit and as positive pole output end,
The other end of the capacitor one connects the second output terminal of the switch power supply output circuit, and the capacitance range of the capacitor one is
0.22uF-22uF。
Preferably, the capacitance of the capacitor one is 4.7uF.
Further, the capacitor one is patch capacitor or alminium electrolytic condenser.
Optionally, the switch power supply output circuit includes transformer secondary output, Schottky diode one, Schottky diode
Two, capacitor two, capacitor three, capacitor four, capacitor five, resistance one, resistance two, resistance three, resistance four, resistance five, resistance six, resistance
Seven, inductance one, feedback photoelectric coupler transmitting terminal and for the controllable accurate source of stable pressure of output voltage reference level, transformation is arranged
Device secondary the anode connection anode of Schottky diode one, the anode of Schottky diode two, one end of resistance one and resistance
One end of the other end connection capacitor two of two one end, the other end of the resistance one and resistance two, the capacitor two it is another
The end connection cathode of Schottky diode two, the cathode of Schottky diode one, one end of capacitor three, one end of resistance three and electricity
One end of sense one, the other end of the capacitor three and the cathode of transformer secondary output connect signal ground, and the other end of the resistance three connects
The anode of feedback photoelectric coupler transmitting terminal is connect, the resistance four is parallel to feedback photoelectric coupler transmitting terminal, the feedback light
One end of the cathode connection resistance five of electric coupler transmitting terminal and the cathode of controllable accurate source of stable pressure, the other end of the resistance five
One end of capacitor four is connected, it is steady that the other end of the capacitor four connects one end of resistance seven, one end of resistance six and controllable accurate
The reference pole of potential source, the anode of the controllable accurate source of stable pressure and another termination signal ground of resistance six, the resistance seven it is another
One end connect the other end of inductance one, one end of capacitor five and positive pole output end and as switch power supply output circuit the
The other end of one output end, the capacitor five connects signal ground as the second output terminal of switch power supply output circuit.
Optionally, the controllable accurate source of stable pressure is the voltage-stabilizing device of model TL431.
Further, when the positive pole output end voltage is 5V, the pressure voltage of the capacitor one is more than or equal to 10V.
Further, when the positive pole output end voltage is 12V, the pressure voltage of the capacitor one is more than or equal to 25V.
Further, when the positive pole output end voltage is 24V, the pressure voltage of the capacitor one is more than or equal to 35V.
The beneficial effects of the utility model are: inhibiting high frequency carrier by the small capacitor one of capacitance, by the defeated of Switching Power Supply
Out ripple be reduced to 10% hereinafter, ensure that master control board chip to power supply ripple requirement, avoid master control board chip because switch
The output ripple and noise of power supply it is excessive without work or working state abnormal the phenomenon that, and then improve the stabilization of circuit
Property.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model embodiment；
Fig. 2 is the circuit diagram of the utility model embodiment；
Fig. 3 is the utility model embodiment circuit output be not powered on when being 5V hold one output ripple voltage figure；
The output ripple voltage figure that Fig. 4 is the output of the utility model embodiment power supply when be 5V capacitor one being 4.7uF；
Fig. 5 is the utility model embodiment circuit output be not powered on when being 12V hold one output ripple voltage figure；
Fig. 6 is that the output of the utility model embodiment power supply is the output ripple voltage figure that 12V capacitor one is 0.22uF；
Fig. 7 is that the output of the utility model embodiment power supply is the output ripple voltage figure that 12V capacitor one is 4.7uF；
Fig. 8 is that the output of the utility model embodiment power supply is the output ripple voltage figure that 12V capacitor one is 22uF；
Fig. 9 be the output of the utility model embodiment power supply be not powered on when being 24V hold one output ripple voltage figure；
Figure 10 is that the output of the utility model embodiment power supply is the output ripple voltage figure that 24V capacitor one is 4.7uF；
Wherein, C1 be capacitor one, T1 is transformer secondary output, D1 is Schottky diode one, D2 be Schottky diode two,
C2 is capacitor two, C3 is capacitor three, C4 is capacitor four, C5 is capacitor five, R1 is resistance one, R2 is resistance two, R3 be resistance three,
R4 is resistance four, R5 is resistance five, R6 is resistance six, R7 is resistance seven, L1 is inductance one, N1A is feedback photoelectric coupler hair
End is penetrated, IC1 is controllable accurate source of stable pressure, and P1, P2, P3, P4, P5 and P6 are ripple test channel, and S1 is output ripple, and pkpk is
Ripple voltage peak-to-peak value.
Specific embodiment
The utility model will be further described with reference to the accompanying drawings and embodiments.
The utility model is intended to overcome the problems, such as the power supply excessively high power demands for being unable to satisfy master control board chip of ripple range, mentions
A kind of Switching Power Supply output filter circuit out.
As described in Figure 1, Switching Power Supply output filter circuit, including the switch power supply output circuit for air purifier,
It further include one C1 of capacitor, one end of one C1 of capacitor connects the first output end of the switch power supply output circuit and as electricity
The other end of source cathode output end, one C1 of capacitor connects the second output terminal of the switch power supply output circuit, the electricity
The capacitance range for holding a C1 is 0.22uF-22uF.
Embodiment
As shown in Fig. 2, the structure of the switch power supply output circuit can be with are as follows: including transformer secondary output T1, Schottky two
One D1 of pole pipe, two D2 of Schottky diode, two C2 of capacitor, three C3 of capacitor, four C4 of capacitor, five C5 of capacitor, one R1 of resistance, resistance two
R2, three R3 of resistance, four R4 of resistance, five R5 of resistance, six R6 of resistance, seven R7 of resistance, one L1 of inductance, feedback photoelectric coupler transmitting terminal
N1A and for be arranged controllable accurate the source of stable pressure IC1, transformer secondary output T1 of output voltage reference level anode connection Schottky
The anode of one D1 of diode, the anode of two D2 of Schottky diode, one R1 of resistance two R2 of one end and resistance one end, the electricity
One end of other end connection two C2 of capacitor of two R2 of the other end and resistance of a R1 is hindered, the other end of two C2 of capacitor connects Xiao
Cathode, the cathode of one D1 of Schottky diode, one end of three C3 of capacitor, one end of three R3 of resistance and the electricity of special two D2 of based diode
Feel one end of a L1, the other end of three C3 of capacitor and the cathode of transformer secondary output T1 connect signal ground, three R3's of resistance
The other end connects the anode of feedback photoelectric coupler transmitting terminal N1A, and four R4 of resistance is parallel to feedback photoelectric coupler transmitting
Hold N1A, one end of cathode connection five R5 of resistance of the feedback photoelectric coupler transmitting terminal N1A and controllable accurate source of stable pressure IC1
Cathode, one end of other end connection four C4 of capacitor of five R5 of resistance, the other end of four C4 of capacitor connects resistance seven
One end of R7, one end of six R6 of resistance and controllable accurate source of stable pressure IC1 reference pole, the sun of the controllable accurate source of stable pressure IC1
Another termination signal ground of six R6 of pole and resistance, the other end, the capacitor five of other end connection one L1 of inductance of seven R7 of resistance
One end of C5 and positive pole output end, another termination signal ground of five C5 of capacitor, wherein controllable accurate source of stable pressure IC1
It can be the voltage-stabilizing device of model TL431.Certainly, switch power supply output circuit can also be other existing structures, be existing
There is technology more mature in technology, and will not be described here in detail.
One C1 of capacitor is in parallel with five C5 of capacitor, and one C1 of capacitor can be alminium electrolytic condenser or patch capacitor, wherein Switching Power Supply
When the output voltage of output circuit is 5V, the pressure voltage of the capacitor one needs to be more than or equal to 10V；Switch power supply output circuit
When output voltage is 12V, the pressure voltage of the capacitor one needs to be more than or equal to 25V；The output voltage of switch power supply output circuit
When for 24V, the pressure voltage of the capacitor one needs to be more than or equal to 35V.
When the output voltage of above-mentioned switch power supply output circuit is 5V, it is not powered on the output ripple tested out when holding a C1
As shown in figure 3, the voltage peak-to-peak value pkpk of its output ripple S1 is 68mv, such ripple voltage value accounting is voltage pattern
13.6%；After switch power supply output circuit has added one C1 of capacitor of 4.7uF, output ripple voltage figure such as Fig. 4 institute for testing out
Show, the voltage peak-to-peak value pkpk of output ripple S1 is 41mv, and such ripple voltage value accounting is 8.2%.
When the output voltage of above-mentioned switch power supply output circuit is 12V, it is not powered on the output line tested out when holding a C1
As shown in figure 5, the voltage peak-to-peak value pkpk of its output ripple S1 is 144mv, such ripple voltage value accounting is wave voltage figure
12%；After switch power supply output circuit has added one C1 of capacitor of 0.22uF, output ripple voltage figure such as Fig. 6 institute for testing out
Show, the voltage peak-to-peak value pkpk of ripple S1 is 107mv, and such ripple voltage value accounting is 8.9%；In switch power supply output circuit
After one C1 of capacitor for having added 4.7uF, the output ripple voltage figure that tests out as shown in fig. 7, its output ripple S1 Voltage Peak peak
Value pkpk is 81mv, and such ripple voltage value accounting is 7.1%；One C1 of capacitor of 22uF is added in switch power supply output circuit
Afterwards, for the output ripple voltage figure tested out as shown in figure 8, the voltage peak-to-peak value pkpk of its ripple S1 is 106mv, such ripple is electric
Pressure value accounting is 8.8%.
When the output voltage of above-mentioned switch power supply output circuit is 24V, it is not powered on the output line tested out when holding a C1
As shown in figure 9, the voltage peak-to-peak value pkpk of its output ripple S1 is 223mv, such ripple voltage value accounting is wave voltage figure
9.29%；After switch power supply output circuit has added one C1 of capacitor of 4.7uF, output ripple voltage figure such as Fig. 4 institute for testing out
Show, the voltage peak-to-peak value pkpk of output ripple S1 is 144mv, and such ripple voltage value accounting is 5.8%.
In conclusion may make by one C1 of capacitor that capacitance range is 0.22uF-22uF suitable for air purifier
The output ripple of switch power supply output circuit significantly reduces.
Claims (7)
1. Switching Power Supply output filter circuit, including the switch power supply output circuit for air purifier, the Switching Power Supply
Output circuit includes transformer secondary output, Schottky diode one, Schottky diode two, capacitor two, capacitor three, capacitor four, electricity
Hold five, resistance one, resistance two, resistance three, resistance four, resistance five, resistance six, resistance seven, inductance one, feedback photoelectric coupler hair
Penetrate end and for the controllable accurate source of stable pressure of output voltage reference level, anode connection two pole of Schottky of transformer secondary output is arranged
The anode of pipe one, the anode of Schottky diode two, one end of resistance one and resistance two one end, the other end of the resistance one
And one end of the other end connection capacitor two of resistance two, the cathode of the other end connection Schottky diode two of the capacitor two,
The cathode of Schottky diode one, one end of capacitor three, one end of resistance three and inductance one one end, the capacitor three it is another
The cathode of end and transformer secondary output connects signal ground, and the other end connection feedback photoelectric coupler transmitting terminal of the resistance three is just
Pole, the resistance four are parallel to feedback photoelectric coupler transmitting terminal, and the cathode of the feedback photoelectric coupler transmitting terminal connects electricity
One end of resistance five and the cathode of controllable accurate source of stable pressure, one end of the other end connection capacitor four of the resistance five, the capacitor
One end, one end of resistance six and the reference pole of controllable accurate source of stable pressure of four other end connection resistance seven, the controllable accurate
The anode of source of stable pressure and another termination signal ground of resistance six, the other end, the electricity of the other end connection inductance one of the resistance seven
Hold five one end and positive pole output end and the first output end as switch power supply output circuit, the capacitor five it is another
The second output terminal as switch power supply output circuit is held to connect signal ground, which is characterized in that it further include capacitor one, the capacitor one
One end connect the first output end of the switch power supply output circuit and as positive pole output end, the capacitor one it is another
One end connects the second output terminal of the switch power supply output circuit, and the capacitance range of the capacitor one is 0.22uF-22uF.
2. Switching Power Supply output filter circuit as described in claim 1, which is characterized in that the capacitance of the capacitor one is
4.7uF。
3. Switching Power Supply output filter circuit as claimed in claim 1 or 2, which is characterized in that the capacitor one is patch electricity
Perhaps alminium electrolytic condenser.
4. Switching Power Supply output filter circuit as described in claim 1, which is characterized in that the controllable accurate source of stable pressure is type
Number be TL431 voltage-stabilizing device.
5. Switching Power Supply output filter circuit as described in claim 1, which is characterized in that the positive pole output end voltage
When for 5V, the pressure voltage of the capacitor one is more than or equal to 10V.
6. Switching Power Supply output filter circuit as described in claim 1, which is characterized in that the positive pole output end voltage
When for 12V, the pressure voltage of the capacitor one is more than or equal to 25V.
7. Switching Power Supply output filter circuit as described in claim 1, which is characterized in that the positive pole output end voltage
When for 24V, the pressure voltage of the capacitor one is more than or equal to 35V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820412091.3U CN208656633U (en) | 2018-03-26 | 2018-03-26 | Switching Power Supply output filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820412091.3U CN208656633U (en) | 2018-03-26 | 2018-03-26 | Switching Power Supply output filter circuit |
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| Publication Number | Publication Date |
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| CN208656633U true CN208656633U (en) | 2019-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820412091.3U Active CN208656633U (en) | 2018-03-26 | 2018-03-26 | Switching Power Supply output filter circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112751477A (en) * | 2020-12-28 | 2021-05-04 | 航天科技控股集团股份有限公司 | Switching power supply for conducting voltage method and rectification method |
-
2018
- 2018-03-26 CN CN201820412091.3U patent/CN208656633U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112751477A (en) * | 2020-12-28 | 2021-05-04 | 航天科技控股集团股份有限公司 | Switching power supply for conducting voltage method and rectification method |
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