CN201039087Y - An onboard power amplification circuit - Google Patents
An onboard power amplification circuit Download PDFInfo
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- CN201039087Y CN201039087Y CNU2007200186932U CN200720018693U CN201039087Y CN 201039087 Y CN201039087 Y CN 201039087Y CN U2007200186932 U CNU2007200186932 U CN U2007200186932U CN 200720018693 U CN200720018693 U CN 200720018693U CN 201039087 Y CN201039087 Y CN 201039087Y
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- power amplification
- power amplifying
- amplification circuit
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Abstract
The utility model discloses a car amplifier circuit, which comprises a signal input circuit, a signal output circuit, a feedback circuit, a power amplifying circuit and a power supply circuit; the signal input circuit and the signal output circuit are respectively connected with the input end and the output end of the power amplifying circuit, the feedback circuit is connected between the output end of the power amplifying circuit and the signal input circuit; the power amplifying circuit is D type power amplifying circuit, the consuming energy end of the D type power amplifying circuit is connected with a standby selection circuit to select the D type power amplifying circuit to work or stop according to the equipment standby or booting state. By adopting the utility model, the efficiency of the car amplifier circuit is improved, so the power waste is reduced, in addition, due to reducing the power waste, the heat energy produced by the wasted power can also be reduced; therefore, the cooling piece used in the existing car system is omitted and the cost can be further reduced.
Description
Technical field
The utility model relates to the circuit engineering field, relates in particular to a kind of power amplification circuit.
Background technology
In the modern means of communication, no matter be public transport, or the Personal Transporter has more and more added multiple media information equipment, and wherein, mobile TV or automobile audio are widely known.In a narrow and small and limited relatively space, it is joyful and comfortable that mobile TV or automobile audio etc. has brought all for uninteresting driving.
In the existing mobile TV or the circuit design of automobile audio, in noisy environment, also can access a more clearly voice signal in order to make driver and crew, its loud speaker generally all needs very big power.Therefore, all need to adopt the power amplification circuit of a suitable vehicle environment to carry out power amplification.
Existing vehicle-mounted power amplification circuit substantially all adopts traditional AB class power amplification circuit.As shown in Figure 1, comprise two AB class power amplifier module U100 and U101.Wherein the input signal of each power amplifier module all passes through block isolating circuit and filter circuit inputs in the power amplifier module, and all has feedback loop to insert the input of this power amplifier module in the output circuit of each power amplifier module.For example, the input signal of power amplifier module U100 is earlier through capacitance C101, again through thereafter RC filter circuit, be coupled to this power amplifier module U100 at last, and in its output circuit, have a feedback loop to insert the inverting input of this power amplifier module U100.And, behind the output signal process feedback loop and filter circuit thereafter of this power amplifier module U100, export by XP103.For power amplifier module U101, also exist and above-mentioned on all four input circuit and output circuit and feedback loop.
But the conversion efficiency of AB class power amplification circuit is low, generally less than 50%, has so just caused great power dissipation, has also just increased cost.For example, if the power that we need is the words of 10W, so just need power supply that the power of 20W is provided, so just waste the power of 10W, and if the power of the described 10W that slatterns all is converted into the words of heat energy, destruction to the stability of system also is sizable, is easy to cause burning out of each device, has also just reduced the reliability of attacking and defending circuit.
Therefore, need the high vehicle-mounted power amplification circuit of a kind of conversion efficiency badly.
Summary of the invention
Technical problem to be solved in the utility model is, a kind of low cost, high efficiency, reliable and stable vehicle-mounted power amplification circuit are provided.
In order to solve the problems of the technologies described above; the utility model proposes a kind of vehicle-mounted power amplification circuit; it comprises signal input circuit; signal output apparatus; feedback circuit; power amplification circuit and power circuit; signal input circuit is connected with output with the input of power amplification circuit respectively with described signal output apparatus; feedback circuit is connected between the output and signal input circuit of power amplification circuit; it is characterized in that; described power amplification circuit is a D class power amplification circuit, is connected with according to device standby/open state in the Enable Pin of described D class power amplification circuit and selects the standby of described D class power amplification circuit work or shutdown to select circuit.
Wherein, described standby selects circuit to comprise the divider resistance that connects power supply, connect with this divider resistance and voltage stabilizing circuit other end ground connection, and the first gating branch road and the second gating branch road; The described first gating branch road is connected between the intermediate node of the Enable Pin of D class power amplification circuit and described divider resistance and voltage stabilizing circuit; The described second gating branch road is connected between the Enable Pin and ground of D class power amplification circuit.Described vehicle power amplifying circuit also comprises a main control chip, and the strobe state of the described first gating branch road and the second gating branch road is controlled by the control signal of described main control chip output.
Optionally, described standby selects circuit to comprise the pull-up resistor that connects power supply, connect with this pull-up resistor and voltage stabilizing circuit other end ground connection, the intermediate node of described pull-up resistor and voltage stabilizing circuit is connected described main control chip on the one hand, connects the Enable Pin of described D class power amplification circuit on the other hand.
Preferably, described voltage stabilizing circuit is a voltage stabilizing didoe, and its negative electrode connects described divider resistance, plus earth.
In addition, described signal input circuit be the multi channel signals input circuit and respectively with the corresponding connection of input multiplexer of described D class power amplification circuit, described signal output apparatus be the multi channel signals output circuit also respectively with the corresponding connection of the multichannel output channel of described D class power amplification circuit.
Wherein, described signal input circuit comprises two branch roads of differential signal transmission, and in order to satisfy the transmission of non-differential signal simultaneously, one of them branch road is by switching circuit ground connection, and when the non-differential signal of transmission, the described switching circuit of gating gets final product.
Preferably, described switching circuit adopts jumper wire device to realize, an end connects wherein one road differential signal branch road, other end ground connection.
In addition, described signal input circuit is connected the input of described D class power amplification circuit through a capacitance and a filter circuit; The output of described D class power amplification circuit is connected to signal output apparatus through another filter circuit.
Wherein, described feedback circuit is a voltage negative-feedback circuit in parallel.
Implement the utility model, can improve the efficient of vehicle-mounted power amplification circuit, thereby reduce power dissipation, so also just reduced cost.And owing to reduced power dissipation, the heat energy that is produced by that part of power that slatterns also reduces thereupon, thereby has removed fin used in the existing onboard system from, and then also can further reduce cost.Simultaneously, owing to caloric value reduces, thereby also can improve the stability and the reliability of system.
Description of drawings
Fig. 1 is the schematic diagram of existing vehicle power amplifying circuit;
Fig. 2 is the circuit theory diagrams of an embodiment of vehicle power amplifying circuit of the present utility model;
Fig. 3 is the circuit theory diagrams of another embodiment of stand-by circuit in the utility model.
Embodiment
With reference to figure 2, illustrate the circuit structure of an embodiment of a kind of vehicle power amplifying circuit of the utility model.As shown in the figure, the D power-like amplifier of D class power amplification circuit employing PHILIPS TFA9810 two-channel 2-4 * 12W in the present embodiment.The input small-signal is by J2 and J5 input, through block isolating circuit and feedback circuit and filter circuit, 2,3,14,15 pin by described TFA9810 power amplifier enter this amplifier at last, after amplifying through described power amplifier, export to outside the sheet by 21,23,26,28 pin of described amplifier.Here, described block isolating circuit can only be a capacitance, as the C6 among the figure, C7, C18, C26 electric capacity, can certainly be the lower high pass filter of cut-off frequency etc.Described filter circuit can be a RC filter circuit as shown in Figure 2, certainly also can use the filter circuit of other types here, for example passive filter circuit such as LC filtering or various π type filter circuits also can add active device and form active filter circuit etc., and the utility model is not limited thereto.
Described feedback circuit, can adopt the voltage negative feedback circuit of present more application, as shown in the figure, described voltage negative feedback circuit inserts in the input circuit by the R5 resistance in the input circuit, its feedback sources is promptly introduced feedback by 28 pin and by resistance R 5 from 28 pin in the output circuit; In like manner, the feedback from another branch road of the small-signal difference centering of J2 is to introduce in these branch roads by 26 pin and by resistance R 14.In another passage, also there is similar situation, feeds back introducing by 21 pin and 23 pin respectively, be introduced into respectively in the described differential pair input circuit by resistance R 17 and resistance R 26 respectively accordingly by the small-signal difference of J5 input.
Corresponding to two small-signal input channels described in the present embodiment, output at described TFA9810 power amplifier also comprises two signal output channels, export to outside the sheet by 21,23,26,28 pin respectively, and introduce negative feedback to input by these four pin.Connecing one group of filter circuit after respectively behind described 21,23,26,28 pin, for example after described four pin, all be connected to RC filter circuit, LC filter circuit and second RC filter circuit in the present embodiment, export by J3 at last through behind described one group of filter circuit.
Need to prove, for described four output pins one group of filter circuit connecing after respectively, can also adopt other filter sequence, for example earlier through LC filtering, pass through RC etc. again, perhaps adopt other filter circuit, the utility model is not limited, as long as the effect that can reach filtering is all in scope of the present utility model.
In the present embodiment, 7 pin of described TFA9810 power amplifier, promptly Enable Pin also is connected to standby and selects circuit.Circuit is selected in this standby, as shown in Figure 2, comprises the divider resistance R1 that connects DC power supply, connects with this divider resistance R1 and the voltage-stabiliser tube D1 of the other end (anode) ground connection and the first and second two gating branch roads being connected in described voltage-stabiliser tube D1 two ends.The described first gating branch road is connected between the intermediate node of the Enable Pin (i.e. the 7th pin) of D class power amplification circuit and described divider resistance R1 and voltage-stabiliser tube D1; The described second gating branch road is connected between the Enable Pin (i.e. the 7th pin) and ground of D class power amplification circuit.Wherein, the gating of the described first gating branch road and the second gating branch road is realized by the folding of K switch 1 and K2.The described first gating branch road is connected to described intermediate node by K switch 1, and the described second gating branch road is connected between the Enable Pin (i.e. the 7th pin) and ground of described D class power amplification circuit by K switch 2.When the K1 disconnection, when K2 was closed, at this moment the first gating branch road disconnected, the second gating branch road conducting, and the Enable Pin of described D class power amplification circuit receives low level, enters holding state.When the K1 closure, when K2 disconnects, the first gating branch road conducting at this moment, the second gating branch road disconnects, and described D class power amplification circuit transfers operating state to by holding state.Here, described K switch 1 and K2 can realize that for example, K1 is the normally closed switch of relay by the switch of relay, K2 is the normal open switch of described relay, relay coil electric and dead electricity are controlled by the high-low level control signal of the GPIO mouth output of main control chip.Can certainly adopt any other suitable mode, the utility model is not limited thereto.Simultaneously, here we utilize voltage-stabiliser tube D1 to realize voltage stabilizing circuit, can certainly adopt other any suitable forms to realize pressure stabilization function.
In addition, in the small-signal input circuit from two passages of J2 and J5, in a branch road of the input circuit of its each passage, an earthed circuit is arranged all, and the work of controlling described earthed circuit by the break-make of switching circuit whether, switching circuit herein can be switch element J4 and the J7 shown in Fig. 2, also can be transistor switching circuit or jumper wire device etc.When the input small-signal from described J2 and J5 is not differential pair signal but single-ended signal, when promptly having only one road signal, just can be by described switching circuit with another road ground connection, thus realize the input of one road signal.
With reference to figure 3, in another embodiment of the present utility model, at other circuit all on the basis of invariable, described stand-by circuit comprises the pull-up resistor R1 that connects DC power supply, and voltage stabilizing didoe D1 other end ground connection that connect with this pull-up resistor R1, intermediate node between described pull-up resistor R1 and the voltage stabilizing didoe D1 connects the GPIO mouth of main control chip on the one hand, connects the Enable Pin (i.e. the 7th pin) of described D power-like amplifier TFA9810 on the other hand.When described GPIO mouth is exported high level signal, the Enable Pin of D power-like amplifier TFA9810 (i.e. the 7th pin) is changed to high level, when described GPIO mouth output low level signal, the Enable Pin of D power-like amplifier TFA9810 (i.e. the 7th pin) is changed to low level, thereby this D power-like amplifier TFA9810 carries out the switching of standby and operating state according to the high-low level state of its Enable Pin (i.e. the 7th pin).
It is to be noted, just enumerated the situation that signal input circuit and signal output apparatus are respectively two-way in this embodiment,, can release according to reason equally for situation greater than two-way or one tunnel, equally in scope of the present utility model, here be not described in detail one by one yet.
Above disclosed only is a kind of preferred embodiment of the utility model, can not limit the interest field of the utility model certainly with this, and therefore the equivalent variations of being done according to the utility model claim still belongs to the scope that the utility model is contained.
Claims (10)
1. vehicle power amplifying circuit; it comprises signal input circuit; signal output apparatus; feedback circuit; power amplification circuit and power circuit; signal input circuit is connected with output with the input of power amplification circuit respectively with described signal output apparatus; feedback circuit is connected between the output and signal input circuit of power amplification circuit; it is characterized in that; described power amplification circuit is a D class power amplification circuit, is connected with according to device standby/open state in the Enable Pin of described D class power amplification circuit and selects the standby of described D class power amplification circuit work or shutdown to select circuit.
2. vehicle power amplifying circuit as claimed in claim 1 is characterized in that, described standby selects circuit to comprise the divider resistance that connects power supply, connect with this divider resistance and voltage stabilizing circuit other end ground connection, and the first gating branch road and the second gating branch road; The described first gating branch road is connected between the intermediate node of the Enable Pin of D class power amplification circuit and described divider resistance and voltage stabilizing circuit; The described second gating branch road is connected between the Enable Pin and ground of D class power amplification circuit.
3. vehicle power amplifying circuit as claimed in claim 2 is characterized in that, described vehicle power amplifying circuit also comprises a main control chip, and the strobe state of the described first gating branch road and the second gating branch road is controlled by the control signal of described main control chip output.
4. vehicle power amplifying circuit as claimed in claim 1, it is characterized in that, described vehicle power amplifying circuit also comprises a main control chip, described standby selects circuit to comprise the pull-up resistor that connects power supply, connect with this pull-up resistor and voltage stabilizing circuit other end ground connection, the intermediate node of described pull-up resistor and voltage stabilizing circuit is connected described main control chip on the one hand, connects the Enable Pin of described D class power amplification circuit on the other hand.
5. as each described vehicle power amplifying circuit among the claim 2-4, it is characterized in that described voltage stabilizing circuit is a voltage stabilizing didoe, its negative electrode connects described divider resistance, plus earth.
6. as each described vehicle power amplifying circuit among the claim 1-4, it is characterized in that, described signal input circuit be the multi channel signals input circuit and respectively with the corresponding connection of input multiplexer of described D class power amplification circuit, described signal output apparatus be the multi channel signals output circuit also respectively with the corresponding connection of the multichannel output channel of described D class power amplification circuit.
7. vehicle power amplifying circuit as claimed in claim 6 is characterized in that, described signal input circuit comprises two branch roads of differential signal transmission, and one of them branch road is by switching circuit ground connection.
8. vehicle power amplifying circuit as claimed in claim 7 is characterized in that, described switching circuit is a jumper wire device, and an end connects wherein one road differential signal branch road, other end ground connection.
9. as each described vehicle power amplifying circuit among the claim 1-4, it is characterized in that described signal input circuit is connected the input of described D class power amplification circuit through a capacitance and a filter circuit; The output of described D class power amplification circuit is connected to signal output apparatus through another filter circuit.
10. as each described vehicle power amplifying circuit among the claim 1-4, it is characterized in that described feedback circuit is a voltage negative-feedback circuit in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200186932U CN201039087Y (en) | 2007-02-06 | 2007-02-06 | An onboard power amplification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200186932U CN201039087Y (en) | 2007-02-06 | 2007-02-06 | An onboard power amplification circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201039087Y true CN201039087Y (en) | 2008-03-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200186932U Expired - Fee Related CN201039087Y (en) | 2007-02-06 | 2007-02-06 | An onboard power amplification circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201039087Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986227A (en) * | 2010-11-09 | 2011-03-16 | 北京理工大学 | Long-distance control system |
| CN102355228A (en) * | 2011-09-02 | 2012-02-15 | 宁波杉工结构监测与控制工程中心有限公司 | Multi-channel lowpass filter |
| CN102403962A (en) * | 2010-09-15 | 2012-04-04 | 三星电机株式会社 | Rf power amplifier |
-
2007
- 2007-02-06 CN CNU2007200186932U patent/CN201039087Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102403962A (en) * | 2010-09-15 | 2012-04-04 | 三星电机株式会社 | Rf power amplifier |
| CN101986227A (en) * | 2010-11-09 | 2011-03-16 | 北京理工大学 | Long-distance control system |
| CN102355228A (en) * | 2011-09-02 | 2012-02-15 | 宁波杉工结构监测与控制工程中心有限公司 | Multi-channel lowpass filter |
| CN102355228B (en) * | 2011-09-02 | 2014-03-12 | 宁波杉工结构监测与控制工程中心有限公司 | Multi-channel lowpass filter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080319 Termination date: 20110206 |