CN2741292Y - Single-channel D-type halftone power amplifier of PDP TV-set - Google Patents
Single-channel D-type halftone power amplifier of PDP TV-set Download PDFInfo
- Publication number
- CN2741292Y CN2741292Y CN 200420097861 CN200420097861U CN2741292Y CN 2741292 Y CN2741292 Y CN 2741292Y CN 200420097861 CN200420097861 CN 200420097861 CN 200420097861 U CN200420097861 U CN 200420097861U CN 2741292 Y CN2741292 Y CN 2741292Y
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- pdp
- power amplifier
- circuit
- fds8958
- resistance
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Abstract
Disclosed is a single-channel D-type halftone power amplifier of PDP TV-set, which belongs to a TV set circuit. The single-channel D-type halftone power amplifier of PDP TV-set is composed of a PWM chip which is connected with an audio frequency processing circuit of a TV set, two paths of resistance-capacitance circuits which are respectively connected with the two output terminals of a PWM chip, two FDS8958 chips which are connected with one path of the resistance-capacitance circuits, two filter inductances which are respectively connected to the output terminals of the two FDS8958 chips, and an RC network which is cross-connected between the two inductance output terminals. Each path of the resistance-capacitance circuits is composed of two paths of resistance-capacitance series circuit. The output terminals of every two paths of resistance-capacitance current circuits are connected with the input terminal of one FDS8958 chip. The PWM chip is made up of a CM8685M. The single-channel D-type halftone power amplifier of PDP TV-provided with the advantages of relatively great power, higher efficiency, favorable electricity saving effect and smaller circuit volume is an ideal D class power amplifier, and can be widely applied to various PDP TV sets.
Description
Technical field
The utility model belongs to the TV set circuit technical field, more particularly relates to the improvement of PDP used as television single channel D class sound accompaniment power amplifier.
Background technology
At present, PDP (plasma) television set is more and more universal, its large-screen, high-quality picture effect be the PDP TV more and more by consumers in general parent's reason of looking at.But itself has following weak point again the PDP television set: power consumption is bigger, and organism fever is heavier.Be so limited, if use general in the past AB class or category-A audio power amplifier that too big sound accompaniment output then can not be arranged, because AB class or category-A power amplifier itself are accomplished high-power output and undistorted very difficult, and the power utilization efficient of this two classes power amplifier is very low.Large-sized TV like this is but mixed the little acoustics of power, can't but be a kind of more serious defective.
Summary of the invention
The purpose of this utility model just is to overcome above-mentioned shortcoming and defect, and a kind of PDP used as television single channel D class sound accompaniment power amplifier is provided.It selects for use D class power amplifier as PDP sound accompaniment output power amplifier scheme, and power is bigger, and efficient is higher, and power savings is good, and the volume of circuit is less, is a kind of desirable PDP television set D power-like amplifier.
In order to achieve the above object, the utility model is connected with the audio frequency processing circuit of television set.It is by the filter inductance on the output that is connected the PWM chip on the audio frequency processing circuit, the two-way resistor capacitor circuit that is connected with two outputs of PWM chip respectively, two FDS8958 chips that are connected with one road resistor capacitor circuit respectively, is connected to two FDS8958 chips and be connected across two RC network between the inductance output end and formed.Each road resistor capacitor circuit is formed by the two-way resistor-capacitor series circuit, and the output of every two-way resistor-capacitor series circuit is connected to the input of a slice FDS8958 chip.
The utility model selects for use D class power amplifier as PDP sound accompaniment output power amplifier scheme.Use D class power amplifier that following advantage is arranged on the PDP TV: at first, the PDP stock size is bigger, needs powerful sound accompaniment effect to cooperate with it; Secondly, the power consumption of PDP is bigger, and this just requires to improve as much as possible power-efficient, saves electric energy; Once more, the PDP enclosure space is little, and the machine external form is slim, and heat-dissipating space is little, reduces the circuit board volume when requiring electronic circuitry design as far as possible.Comprehensive above-mentioned some, D class power amplifier is optimal selection.D class power amplifier can be realized high-power (usually more than 10W) and undistorted; And the power utilization efficient of D class power amplifier is very high, can reach more than 90% usually; D class power amplifier design does not need fin usually, and this has saved volume again and then has saved the utilization of PDP inner space.
Two FDS8958 mixing MOS are operated under the control of prime modulating pulse and are on off state, and 4 MOS FET timesharing conducting work of its inside become the switching regulator amplifier.The switch conduction resistance of MOS FET is far smaller than 1 Ω, and loss is still very little comparatively speaking.When reaching maximum rated power, the efficient of D class A amplifier A is about more than the twice of class ab ammplifier in 80% to 90% scope.
MOS FET output connects filter inductance respectively with level and smooth pulsewidth ripple, has the RC network of cross-over connection to remove the noise composition of sneaking between two-way.
The PWM chip is made of CM8685M.CM8685M is the PWM chip, and it can realize analog signal digital pulse width modulation.Its work supply power voltage is 5V, and 5 pin are input end of analog signal, and 2 pin and 7 pin are opposite polarity two modulating pulse outputs.
Task of the present utility model comes to this and finishes.
The utility model sound accompaniment power output is big, and the undistorted sound accompaniment power output of 8ohm load can reach 12W; The 12V low-voltage power supply, power utilization efficient height can reach 90%; Circuit design is simple, does not need fin, and volume is little; Convenient disassembly.It can be widely used in the various PDP television sets, also can be used as standalone module and uses at other similar applications flexibly.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Fig. 2 is the pulse-width modulation waveform figure of its PWM chip.
Embodiment
Embodiment 1.A kind of PDP used as television single channel D class sound accompaniment power amplifier, as shown in Figure 1.It is by being connected PWM chip (1) on the audio frequency processing circuit, the two-way resistor capacitor circuit (3) that is connected with two output 7 pin and 2 pin of PWM chip (1) respectively and (4), the two FDS8958 chips (5) that are connected with one road resistor capacitor circuit respectively and (6), being connected to filter inductance (9) on the output of two FDS8958 chips (5) and (6) and (8) and the RC network (10) that is connected across between the output of two inductance (9) and (8) is formed.Each road resistor capacitor circuit (3) and (4) are formed by the series circuit of two-way resistance (11) and electric capacity (12), and the output of every two-way resistor-capacitor series circuit (13) and (14) are connected to input 4 pin and 2 pin of a slice FDS8958 chip.Input 5 pin of PWM chip (1) are connected with the output of audio frequency processing circuit.The last output of RC network (10) is (2) and (7).
PWM chip (1) is made of CM8685M.The pulse-width modulation waveform of CM8685M chip (1) is seen Fig. 2.
The sound accompaniment power of embodiment 1 is bigger, and efficient is higher, and power savings is good, and the volume of circuit is less, is a kind of desirable D power-like amplifier.It also is easy to dismounting, and is flexible for installation, not only can be widely used in also can using flexibly at other similar applications in the various PDP television sets.
Claims (2)
1. PDP used as television single channel D class sound accompaniment power amplifier, it is connected with the audio frequency processing circuit of television set, it is characterized in that it is by the PWM chip, the two-way resistor capacitor circuit that is connected with two outputs of PWM chip respectively, two FDS8958 chips that are connected with one road resistor capacitor circuit respectively, be connected to the filter inductance on the output of two FDS8958 chips and be connected across two RC network between the inductance output end and form, each road resistor capacitor circuit is formed by the two-way resistor-capacitor series circuit, and the output of every two-way resistor-capacitor series circuit is connected to the input of a slice FDS8958 chip.
2. according to the described PDP used as television of claim 1 single channel D class sound accompaniment power amplifier, it is characterized in that said PWM chip is made of CM8685M.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420097861 CN2741292Y (en) | 2004-11-23 | 2004-11-23 | Single-channel D-type halftone power amplifier of PDP TV-set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420097861 CN2741292Y (en) | 2004-11-23 | 2004-11-23 | Single-channel D-type halftone power amplifier of PDP TV-set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2741292Y true CN2741292Y (en) | 2005-11-16 |
Family
ID=35351568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420097861 Expired - Fee Related CN2741292Y (en) | 2004-11-23 | 2004-11-23 | Single-channel D-type halftone power amplifier of PDP TV-set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2741292Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10425914B2 (en) | 2015-08-31 | 2019-09-24 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and network node for deciding a probability that a first user equipment is located in a building |
-
2004
- 2004-11-23 CN CN 200420097861 patent/CN2741292Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10425914B2 (en) | 2015-08-31 | 2019-09-24 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and network node for deciding a probability that a first user equipment is located in a building |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |