CN204408395U - A kind of circuit improving phone weighted noise performance - Google Patents
A kind of circuit improving phone weighted noise performance Download PDFInfo
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- CN204408395U CN204408395U CN201420871866.5U CN201420871866U CN204408395U CN 204408395 U CN204408395 U CN 204408395U CN 201420871866 U CN201420871866 U CN 201420871866U CN 204408395 U CN204408395 U CN 204408395U
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- power conversion
- conversion circuit
- noise performance
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Abstract
The utility model provides a kind of circuit improving phone weighted noise performance, comprises PFC correcting circuit, DC/DC power conversion circuit, and the bus between described PFC correcting circuit and DC/DC power conversion circuit is in series with pi type filter.The utility model reduces PFC bus harmonic wave by pi type filter, thus reduces the output phone weighted noise of DC/DC power conversion circuit.
Description
Technical field
The utility model relates to a kind of circuit improving phone weighted noise performance.
Background technology
Because people's ear and earphone are to the response difference of various frequency, after the noise voltage of frequency various in 25Hz ~ 5KHz frequency range is equivalent to the magnitude of voltage of 800HZ, get its weighted value.Phone weighted noise is also known as phone weighting noise.The current technology improving phone weighted noise improves gain by loop algorithm to reduce noise voltage, but if improved limited when input harmonics is larger by loop algorithm.
Summary of the invention
The utility model provides the circuit of simple, the effective improvement phone weighted noise performance of a kind of structure.
The technical solution adopted in the utility model is:
Improve a circuit for phone weighted noise performance, comprise PFC correcting circuit, DC/DC power conversion circuit, it is characterized in that: the bus between described PFC correcting circuit and DC/DC power conversion circuit is in series with pi type filter.The utility model reduces PFC bus harmonic wave by pi type filter, thus reduces the output phone weighted noise of DC/DC power conversion circuit.
Further, the bus between the positive bus-bar of described PFC correcting circuit and DC/DC power conversion circuit is in series with pi type filter.
Or, the positive bus-bar of described PFC correcting circuit, the bus between negative busbar and DC/DC power conversion circuit are all in series with pi type filter.
Further, described PFC correcting circuit mid-point voltage place is directly connected with DC/DC power conversion circuit mid-point voltage place.
Further, described pi type filter comprises the common mode inductance on a bus being connected between PFC correcting circuit and DC/DC power conversion circuit, and the side, front and back of described common mode inductance all and be connected to electric capacity.
Further, described PFC correcting circuit comprises the single-stage boost circuit of employing gate-controlled switch device and the PFC power stage circuit of derivative soft switch circuit thereof.
Further, described derivative soft switch circuit is non-bridge PFC circuits or full-bridge pfc circuit.
Further, described DC/DC power conversion circuit has the DC/DC power conversion circuit of resonant circuit, half-bridge DC/DC power conversion circuit, full-bridge DC/DC power conversion circuit, normal shock power-varying circuitry or flyback power conversion circuit.
The beneficial effects of the utility model: reduce PFC bus harmonic wave by pi type filter, thus the output phone weighted noise reducing DC/DC power conversion circuit.
Accompanying drawing explanation
Fig. 1 is the circuit theory schematic diagram that the utility model implements.
Fig. 2 is the circuit theory schematic diagram of the utility model embodiment two.
Embodiment
Below in conjunction with specific embodiment, the utility model is further described, but the utility model is not confined to these embodiments.One skilled in the art would recognize that the utility model covers all alternatives, improvement project and the equivalents that may comprise in Claims scope.
Implement one
With reference to Fig. 1, a kind of circuit improving phone weighted noise performance, comprises PFC correcting circuit 1, DC/DC power conversion circuit 2, and the bus between the positive bus-bar BUS+ of described PFC correcting circuit 1 and DC/DC power conversion circuit 2 is in series with pi type filter 3.The utility model reduces PFC bus harmonic wave by pi type filter 3, thus reduces the output phone weighted noise of DC/DC power conversion circuit 2.
Pi type filter 3 described in the present embodiment comprises the common mode inductance L on a bus being connected between PFC correcting circuit 1 and DC/DC power conversion circuit 2, and the side, front and back of described common mode inductance L all and be connected to electric capacity C.
PFC correcting circuit 1 described in the present embodiment comprises the single-stage boost circuit of employing gate-controlled switch device and the PFC power stage circuit of derivative soft switch circuit thereof.Described in the present embodiment, derivative soft switch circuit is non-bridge PFC circuits or full-bridge pfc circuit.
DC/DC power conversion circuit 2 described in the present embodiment has the DC/DC power conversion circuit of resonant circuit, half-bridge DC/DC power conversion circuit, full-bridge DC/DC power conversion circuit, normal shock power-varying circuitry or flyback power conversion circuit.
Implement two
With reference to Fig. 2, the difference of the present embodiment and embodiment one is: described PFC correcting circuit 1 positive bus-bar BUS+, bus between negative busbar BUS-and DC/DC power conversion circuit 2 are all in series with pi type filter 3.Being directly connected between PFC correcting circuit 1 mid-point voltage with DC/DC power conversion circuit 2 mid-point voltage, the utility model reduces PFC bus harmonic wave by two pi type filters 3, thus reduces the output phone weighted noise of DC/DC power conversion circuit 2.All the other structures are all identical with embodiment one.
Claims (8)
1. improve a circuit for phone weighted noise performance, comprise PFC correcting circuit, DC/DC power conversion circuit, it is characterized in that: the bus between described PFC correcting circuit and DC/DC power conversion circuit is in series with pi type filter.
2. a kind of circuit improving phone weighted noise performance as claimed in claim 1, is characterized in that: the bus between the positive bus-bar of described PFC correcting circuit and DC/DC power conversion circuit is in series with pi type filter.
3. a kind of circuit improving phone weighted noise performance as claimed in claim 1, is characterized in that: the positive bus-bar of described PFC correcting circuit, the bus between negative busbar and DC/DC power conversion circuit are all in series with pi type filter.
4. a kind of circuit improving phone weighted noise performance as claimed in claim 1, is characterized in that: described PFC correcting circuit mid-point voltage place is directly connected with DC/DC power conversion circuit mid-point voltage place.
5. a kind of circuit improving phone weighted noise performance as described in one of claim 1 ~ 4, it is characterized in that: described pi type filter comprises the common mode inductance on a bus being connected between PFC correcting circuit and DC/DC power conversion circuit, the side, front and back of described common mode inductance all and be connected to electric capacity.
6. a kind of circuit improving phone weighted noise performance as claimed in claim 1, is characterized in that: described PFC correcting circuit comprises the single-stage boost circuit of employing gate-controlled switch device and the PFC power stage circuit of derivative soft switch circuit thereof.
7. a kind of circuit improving phone weighted noise performance as claimed in claim 6, is characterized in that: described derivative soft switch circuit is non-bridge PFC circuits or full-bridge pfc circuit.
8. a kind of circuit improving phone weighted noise performance as claimed in claim 1, is characterized in that: described DC/DC power conversion circuit has the DC/DC power conversion circuit of resonant circuit, half-bridge DC/DC power conversion circuit, full-bridge DC/DC power conversion circuit, normal shock power-varying circuitry or flyback power conversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420871866.5U CN204408395U (en) | 2014-12-30 | 2014-12-30 | A kind of circuit improving phone weighted noise performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420871866.5U CN204408395U (en) | 2014-12-30 | 2014-12-30 | A kind of circuit improving phone weighted noise performance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204408395U true CN204408395U (en) | 2015-06-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420871866.5U Active CN204408395U (en) | 2014-12-30 | 2014-12-30 | A kind of circuit improving phone weighted noise performance |
Country Status (1)
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| CN (1) | CN204408395U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106385171A (en) * | 2016-09-30 | 2017-02-08 | 深圳市奥耐电气技术有限公司 | Interleaved parallel three-phase PFC circuit |
-
2014
- 2014-12-30 CN CN201420871866.5U patent/CN204408395U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106385171A (en) * | 2016-09-30 | 2017-02-08 | 深圳市奥耐电气技术有限公司 | Interleaved parallel three-phase PFC circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |