CN104836540A - Mains supply audio power amplifier not requiring power supply through transformer - Google Patents
Mains supply audio power amplifier not requiring power supply through transformer Download PDFInfo
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- CN104836540A CN104836540A CN201410048387.8A CN201410048387A CN104836540A CN 104836540 A CN104836540 A CN 104836540A CN 201410048387 A CN201410048387 A CN 201410048387A CN 104836540 A CN104836540 A CN 104836540A
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Abstract
The invention discloses a mains supply audio power amplifier not requiring power supply through a transformer. The mains supply audio power amplifier consists of a high-voltage-resistant amplifying circuit, a mains supply rectifying circuit and a filter circuit, wherein the mains supply rectifying circuit and the filter circuit construct a power supply circuit; alternating-current mains supply directly enters the rectifying circuit to be rectified into direct-current mains supply without being subjected to voltage reduction through the transformer; and ripples of the direct-current mains supply are eliminated through the filter circuit, thereby forming a power supply of the mains supply audio power amplifier not requiring power supply through the transformer. The mains supply audio power amplifier not requiring power supply through the transformer has the beneficial effects that an amplifier circuit is constructed through a high-voltage-resistant transistor, and the direct-current mains supply is taken as supply voltage, so that a high-cost transformer is omitted. Meanwhile, the electromagnetic interference is reduced, and the output power of the power amplifier is increased.
Description
Art
The present invention relates to a kind of audio-frequency power amplifier, especially without the civil power audio-frequency power amplifier of transformer-supplied.
Background technology
Current known power amplifier becomes the transformer of AC low-tension and current rectifying and wave filtering circuit etc. by low pressure audio power amplifying circuit, electric main and forms, this known amplifier all must use AC transformer to carry out step-down and power, and there is following imperfection part:
(1) transformer manufacturing complex process, cost is higher, and particularly under the requirement of high-power amplification, it is very large that its transformer efficiency can not be done, and the volume of cost and super large has become its main restricting factor come into the market.
(2) transformer will consume a large amount of non-ferrous metals, causes environmental pollution.
(3) transformer is as radiation of power device, causes the performance of electromagnetic interference influence amplifier.
Summary of the invention
For overcoming the deficiency of known technology, the invention provides a kind of civil power audio-frequency power amplifier without transformer-supplied to be made up of high pressure resistant amplifying circuit, commercial power rectification circuit, filter circuit, it is characterized in that: audio signal is input to the input of high pressure resistant amplifying circuit, high pressure resistant amplification circuit output end connects loud speaker, civil power sends into commercial power rectification circuit, commercial power rectification circuit output end is connected to filter circuit input, and filter circuit output is connected to the power input of high pressure resistant amplifying circuit.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of civil power audio-frequency power amplifier without transformer-supplied is made up of high pressure resistant amplifying circuit, commercial power rectification circuit, filter circuit, wherein commercial power rectification circuit, filter circuit composition power supply circuits, electric main does not need through transformer pressure-reducing, but directly enter rectification circuit and carry out rectification to become electric main be direct current civil power, then form the power supply without the civil power audio-frequency power amplifier of transformer-supplied through the ripple that direct current civil power rejected by filter circuit.
The invention has the beneficial effects as follows by using high pressure resistant transistor to form amplifier circuit and with direct current civil power as the mode of supply power voltage, also reducing the power output that electromagnetic interference improves power amplifier while eliminating the transformer of high cost.
Below in conjunction with drawings and Examples, the present invention is further described.
Accompanying drawing illustrates:
Fig. 1 is the formation block diagram of the civil power audio-frequency power amplifier without transformer-supplied.
Fig. 2 is the schematic diagram of the civil power audio-frequency power amplifier embodiment without transformer-supplied.
Embodiment:
In Fig. 1, audio signal (1.1) is input to the input of high pressure resistant amplifying circuit (1.2), the output of high pressure resistant amplifying circuit (1.2) connects loud speaker (1.3), civil power (1.6) sends into the input of commercial power rectification circuit (1.5), commercial power rectification circuit (1.5) output is connected to filter circuit (1.4) input, and the output of filter circuit (1.4) is connected to the power input of high pressure resistant amplifying circuit (1.2).
Fig. 2, the enforcement special case schematic diagram that it simplifies for the present invention most, wherein NPN transistor A1, A2 ... An, Ra1, Ra2 ... Ran and PNP transistor B1, B2 ... Bn, Rb1, Rb2 ... Rbn forms the high pressure resistant amplifying circuit of class AB (1.2) jointly, wherein, n >=1, NPN transistor and PNP transistor are that matching method is connected and its withstand voltage should be greater than the crest voltage more than 30% of direct current civil power between two, but be not limited to above-mentioned class AB amplification circuit structure in actual applications, every power amplifier that can reach other classifications of effect of audio frequency amplification, all in limited range of the present invention.
In Fig. 2, rectifier bridge stack forms commercial power rectification circuit, C3 forms filter circuit, C1 and C2 forms single supply and is transformed to two-supply circuit, equally, be not limited to foregoing circuit structure in actual applications, every circuit that can reach rectifying and wave-filtering and the conversion of single duplicate supply can reach this effect, all in limited range of the present invention.
Key effects of the present invention is by using high pressure resistant transistor to form amplifier circuit and with direct current civil power as the mode of supply power voltage, also reducing the power output that electromagnetic interference improves power amplifier while eliminating the transformer of high cost.
Claims (3)
1. one kind is made up of high pressure resistant amplifying circuit, commercial power rectification circuit, filter circuit without the civil power audio-frequency power amplifier of transformer-supplied, it is characterized in that: audio signal is input to the input of high pressure resistant amplifying circuit, high pressure resistant amplification circuit output end connects loud speaker, civil power sends into commercial power rectification circuit, commercial power rectification circuit output end is connected to filter circuit input, and filter circuit output is connected to the power input of high pressure resistant amplifying circuit.
2. a kind of civil power audio-frequency power amplifier without transformer-supplied according to claim 1, be further characterized in that commercial power rectification circuit can be made up of full-wave rectifying circuit or full-wave bridge rectifier circuit, ac commercial power voltage rectification is direct voltage by it, is called direct current civil power and as the power source supplying voltage of high pressure resistant amplifying circuit.
3. a kind of civil power audio-frequency power amplifier without transformer-supplied according to claim 1 is further characterized in that high pressure resistant amplifying circuit forms amplifying circuit by high-voltage transistor, and its withstand voltage exceedes the peak value of direct current line voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410048387.8A CN104836540A (en) | 2014-02-11 | 2014-02-11 | Mains supply audio power amplifier not requiring power supply through transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410048387.8A CN104836540A (en) | 2014-02-11 | 2014-02-11 | Mains supply audio power amplifier not requiring power supply through transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104836540A true CN104836540A (en) | 2015-08-12 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410048387.8A Pending CN104836540A (en) | 2014-02-11 | 2014-02-11 | Mains supply audio power amplifier not requiring power supply through transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104836540A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1062254A (en) * | 1990-06-28 | 1992-06-24 | 祖茂连 | High voltge large power transistorized amplifier |
| CN2263374Y (en) * | 1995-10-26 | 1997-09-24 | 杨宝山 | AC double sound electronic door bell |
| CN2323514Y (en) * | 1998-03-10 | 1999-06-09 | 杨霖 | Small high-fidelity power amplifier |
| CN2334121Y (en) * | 1998-02-24 | 1999-08-18 | 陈培莉 | High-voltage audio power amplifier without transformer |
| US6437648B1 (en) * | 2000-09-01 | 2002-08-20 | William Van Beylen | Audio amplifier with transformerless power supply |
| CN1460324A (en) * | 2001-03-29 | 2003-12-03 | 皇家菲利浦电子有限公司 | Balanced transformer-less amplifier and offset detection and correction system therefor |
| CN203951446U (en) * | 2014-02-11 | 2014-11-19 | 闫天时 | Without the civil power audio-frequency power amplifier of transformer-supplied |
-
2014
- 2014-02-11 CN CN201410048387.8A patent/CN104836540A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1062254A (en) * | 1990-06-28 | 1992-06-24 | 祖茂连 | High voltge large power transistorized amplifier |
| CN2263374Y (en) * | 1995-10-26 | 1997-09-24 | 杨宝山 | AC double sound electronic door bell |
| CN2334121Y (en) * | 1998-02-24 | 1999-08-18 | 陈培莉 | High-voltage audio power amplifier without transformer |
| CN2323514Y (en) * | 1998-03-10 | 1999-06-09 | 杨霖 | Small high-fidelity power amplifier |
| US6437648B1 (en) * | 2000-09-01 | 2002-08-20 | William Van Beylen | Audio amplifier with transformerless power supply |
| CN1460324A (en) * | 2001-03-29 | 2003-12-03 | 皇家菲利浦电子有限公司 | Balanced transformer-less amplifier and offset detection and correction system therefor |
| CN203951446U (en) * | 2014-02-11 | 2014-11-19 | 闫天时 | Without the civil power audio-frequency power amplifier of transformer-supplied |
Non-Patent Citations (4)
| Title |
|---|
| 刘午平主编；刘建清等编著: "《用万用表检测电子元器件与电路从入门到精通》", 31 January 2003 * |
| 张元敏 等: "《电子技术导论》", 30 September 2008, 西南交通大学出版社 * |
| 日本电视学会: "《电视晶体管电路》", 30 June 1976, 国防工业出版社 * |
| 许娅主编: "《模拟电子技术基础》", 30 April 2013 * |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150812 |