CN201294489Y - Load circuit, power supply circuit and electronic equipment - Google Patents
Load circuit, power supply circuit and electronic equipment Download PDFInfo
- Publication number
- CN201294489Y CN201294489Y CNU2008202141983U CN200820214198U CN201294489Y CN 201294489 Y CN201294489 Y CN 201294489Y CN U2008202141983 U CNU2008202141983 U CN U2008202141983U CN 200820214198 U CN200820214198 U CN 200820214198U CN 201294489 Y CN201294489 Y CN 201294489Y
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- resistance
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Abstract
The utility model provides a loading circuit, a power source circuit and an electronic device, which are suitable for the power source field. The loading circuit comprises a transistor, a first resistance, a second resistance, a third resistance and a diode, wherein the emitting electrode of the transistor is earthed, the electricity collecting electrode is connected to the power supplying end of a power amplifying circuit through the first resistance, the base electrode is connected with one end of the second resistance, the other end of the second resistance is earthed through the third resistance, and the diode is connected with the power supplying end of the power amplifying circuit. The loading circuit provided by the embodiment of the utility model is connected to the power supplying end of the power amplifying circuit, which effectively prevents the power amplifying circuit to be in an overvoltage protection state.
Description
Technical field
The utility model belongs to field of power supplies, relates in particular to a kind of load circuit, power circuit and electronic equipment.
Background technology
The electronic equipment of general band power amplifier is very high to the requirement of power supply, because the power requirement voltage height of power amplifier, electric current is big, voltage fluctuation is big; Cpu power in other circuit then requires electric current little, stable; Usually adopt a transformer and a sampling feedback circuit to power to power amplifier, adopt another transformer and another sampling feedback circuit to give other circuit supply, yet, adopt not only cost height of two transformers and two sampling feedback circuits, but also it is big to take up room, very unfavorable for components and parts are integrated.
Now adopt a transformer and a sampling feedback circuit to realize giving simultaneously power amplifier and other circuit supply; during start just; CPU in other circuit starts working; this moment, power amplifier did not also have startup; because the operating current of CPU increases gradually; sampling feedback circuit with the operating current feedback information of CPU to power supply; the power drives transformer increases power output; and power amplifier does not also have unlatching; the electric current of power amplifier feeder ear is very little, and the transformer power output becomes greatly, at this moment; cause the voltage of power amplifier feeder ear to become big easily, thereby burn out power amplifier or make power amplifier be in the overvoltage protection state.
The utility model content
The purpose of this utility model is to provide a kind of load circuit, and the voltage that is intended to solve existing power amplifier feeder ear causes power amplifier to be burnt out when becoming big or power amplifier is in the problem of overvoltage protection state.
The utility model is achieved in that a kind of load circuit, comprising:
Transistor, first resistance, second resistance, the 3rd resistance and diode;
Described transistorized grounded emitter, collector electrode is connected to the feeder ear of power amplifier by described first resistance, and base stage is connected with an end of described second resistance;
The other end of described second resistance also is connected to the feeder ear of power amplifier by described the 3rd grounding through resistance by described diode.
The purpose of this utility model is to provide a kind of power circuit, comprise switching power circuit, be connected to the sample circuit of switching power circuit second output and be connected to the output of described sample circuit and the feedback control circuit of the feedback end of described switching power circuit, described power circuit also comprises the load circuit that is connected to described switching power circuit first output, and described load circuit comprises:
Transistor, first resistance, second resistance, the 3rd resistance and diode;
Described transistorized grounded emitter, collector electrode is connected to the feeder ear of power amplifier by described first resistance, and base stage is connected with an end of described second resistance;
The other end of described second resistance also is connected to the feeder ear of power amplifier by described the 3rd grounding through resistance by described diode.
Another purpose of the present utility model is to provide a kind of electronic equipment, comprise switching power circuit, be connected to the power amplifier of described switching power circuit output, described electronic equipment also comprises the load circuit that is connected between described switching power circuit and the described power amplifier, and described load circuit comprises:
Transistor, first resistance, second resistance, the 3rd resistance and diode;
Described transistorized grounded emitter, collector electrode is connected to the feeder ear of power amplifier by described first resistance, and base stage is connected with an end of described second resistance;
The other end of described second resistance also is connected to the feeder ear of power amplifier by described the 3rd grounding through resistance by described diode.
The load circuit that the utility model embodiment provides is connected to the feeder ear of power amplifier, prevents that effectively power amplifier is in the overvoltage protection state.
Description of drawings
Fig. 1 is the circuit diagram of the load circuit that provides of the utility model embodiment;
Fig. 2 is the structure chart of the electronic equipment that provides of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
The load circuit that the utility model embodiment provides is connected to the feeder ear of power amplifier, prevents that effectively power amplifier is in the overvoltage protection state.
The load circuit that the utility model embodiment provides is mainly used in the DVD of band power amplifier, and home theater is in the electronic equipments such as power amplifier.The physical circuit of its load circuit as shown in Figure 1, details are as follows.
Load circuit comprises: transistor Q, first resistance R 1, second resistance R 2, the 3rd resistance R 3 and diode D; Wherein, the grounded emitter of transistor Q, collector electrode is connected to the feeder ear of power amplifier by first resistance R 1, and base stage is connected with an end of second resistance R 2; The other end of second resistance R 2 also is connected to the feeder ear of power amplifier by the 3rd resistance R 3 ground connection by diode D.
As an embodiment of the present utility model, diode D is a voltage stabilizing didoe; Transistor Q is a N type triode.
Now describe in detail when the voltage of power amplifier feeder ear becomes big in conjunction with Fig. 1, the load circuit that the utility model provides is how to prevent that power amplifier is in the overvoltage protection state.When the voltage of power amplifier feeder ear becomes big; diode D conducting; flow through some in the electric current of power amplifier feeder ear by diode D; second resistance R 2 is to the base stage of transistor Q; make transistor Q conducting; the electric current of base stage that flow to transistor Q is big more; the conducting of transistor Q is good more; like this; the power amplifier feeder ear power supply by first resistance R 1; transistor Q is to ground; being equivalent to has increased a load circuit at the feeder ear of power amplifier, has shunted a part of electric current, when the voltage of power amplifier feeder ear becomes big; this load circuit drags down the voltage of power amplifier feeder ear, thereby has protected power amplifier.When the voltage of power amplifier feeder ear just often, diode D is in non operating state, transistor Q is in cut-off state, this load circuit is not worked, and effectively prevents the loss of the power supply of power amplifier feeder ear.
In the utility model embodiment, load circuit can be applied to the requirement of the supply voltage of different power amplifiers by the parameter of adjusting diode D, second resistance R 2 and the 3rd resistance R 3; Equally, also can satisfy the requirement of the power amplifier power supply of different capacity by the parameter of adjusting first resistance R 1 and transistor Q.
Fig. 2 shows the structure of electronic equipment, and this electronic equipment can be power amplifier, home theater, also can be the terminal of band power amplifier.For convenience of explanation, only show the part relevant with the utility model, details are as follows.
A kind of electronic equipment, comprise switching power circuit 1, power amplifier 2, other circuit 3, sample circuit 4, feedback control circuit 5 and load circuit 6, wherein, power amplifier 2 is connected to first output of switching power circuit 1, other circuit 3 is connected to second output of switching power circuit 1, the input of sample circuit 4 is connected between switching power circuit 1 and other circuit 3, output is connected to the input of feedback control circuit 5, and the output of feedback control circuit 5 is connected with switching power circuit 1; Load circuit 6 is connected between switching power circuit 1 and the power amplifier 2.
Wherein, load circuit 6 is the load circuit that the utility model embodiment provides, and repeats no more inferior.
Switching power circuit 1 is with 220V ac voltage signal output two-way d. c. voltage signal after over commutation, filtering, transformation are handled, one the tunnel is used for to power amplifier 2 power supplies, another road is used for to other circuit 3 power supplies, the voltage signal that sample circuit 4 is exported to other circuit 3 power supplies with switching power circuit 1 is sampled, and voltage sampling signal is fed back to switching power circuit 1 by feedback control circuit 5, adjust the voltage signal of exporting to other circuit 3 by switching power circuit 1 in good time, make other circuit 3 can obtain stable supply power voltage signal.When switching power circuit 1 is exported to power amplifier 2 supply power voltage signals when excessive; by load circuit 6 that this supply power voltage signal shunting is a part of; prevented that power amplifier 2 is in the overvoltage protection state, avoided power amplifier 2 to be burnt out owing to the overtension of feeder ear.
The utility model embodiment also provides a kind of power circuit, comprise switching power circuit 1, be connected to the sample circuit 4 of switching power circuit second output and be connected to the output of sample circuit 4 and the feedback control circuit 5 of the feedback end of switching power circuit 1, power circuit also comprises the load circuit 6 that is connected to switching power circuit 1 first output, and load circuit 6 further comprises: transistor Q, first resistance R 1, second resistance R 2, the 3rd resistance R 3 and diode D; Wherein, the grounded emitter of transistor Q, collector electrode is connected to the feeder ear of power amplifier by first resistance R 1, and base stage is connected with an end of second resistance R 2; The other end of second resistance R 2 also is connected to the feeder ear of power amplifier by the 3rd resistance R 3 ground connection by diode D.When adopting above-mentioned power circuit to give power amplifier 2 and 3 power supplies of other circuit; when switching power circuit 1 is exported to power amplifier 2 supply power voltage signals when excessive; by load circuit 6 that this supply power voltage signal shunting is a part of; prevented that power amplifier 2 is in the overvoltage protection state, avoided power amplifier 2 to be burnt out owing to the overtension of feeder ear.
The load circuit that the utility model embodiment provides is connected to the feeder ear of power amplifier, prevents that effectively power amplifier is in the overvoltage protection state.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (10)
1, a kind of load circuit is characterized in that, described load circuit comprises:
Transistor, first resistance, second resistance, the 3rd resistance and diode;
Described transistorized grounded emitter, collector electrode is connected to the feeder ear of power amplifier by described first resistance, and base stage is connected with an end of described second resistance;
The other end of described second resistance also is connected to the feeder ear of power amplifier by described the 3rd grounding through resistance by described diode.
2, load circuit as claimed in claim 1 is characterized in that, described diode is a voltage stabilizing didoe.
3, load circuit as claimed in claim 1 is characterized in that, described transistor is a N type triode.
4, a kind of power circuit, comprise switching power circuit, be connected to the sample circuit of switching power circuit second output and be connected to the output of described sample circuit and the feedback control circuit of the feedback end of described switching power circuit, it is characterized in that, described power circuit also comprises the load circuit that is connected to described switching power circuit first output, and described load circuit comprises:
Transistor, first resistance, second resistance, the 3rd resistance and diode;
Described transistorized grounded emitter, collector electrode is connected to the feeder ear of power amplifier by described first resistance, and base stage is connected with an end of described second resistance;
The other end of described second resistance also is connected to the feeder ear of power amplifier by described the 3rd grounding through resistance by described diode.
5, power circuit as claimed in claim 4 is characterized in that, described diode is a voltage stabilizing didoe.
6, power circuit as claimed in claim 4 is characterized in that, described transistor is a N type triode.
7, a kind of electronic equipment, comprise switching power circuit, be connected to the power amplifier of described switching power circuit output, it is characterized in that, described electronic equipment also comprises the load circuit that is connected between described switching power circuit and the described power amplifier, and described load circuit comprises:
Transistor, first resistance, second resistance, the 3rd resistance and diode;
Described transistorized grounded emitter, collector electrode is connected to the feeder ear of power amplifier by described first resistance, and base stage is connected with an end of described second resistance;
The other end of described second resistance also is connected to the feeder ear of power amplifier by described the 3rd grounding through resistance by described diode.
8, electronic equipment as claimed in claim 7 is characterized in that, described diode is a voltage stabilizing didoe.
9, electronic equipment as claimed in claim 7 is characterized in that, described transistor is a N type triode.
10, electronic equipment as claimed in claim 7 is characterized in that, described electronic equipment is the terminal of power amplifier or band power amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202141983U CN201294489Y (en) | 2008-12-04 | 2008-12-04 | Load circuit, power supply circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202141983U CN201294489Y (en) | 2008-12-04 | 2008-12-04 | Load circuit, power supply circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201294489Y true CN201294489Y (en) | 2009-08-19 |
Family
ID=41007969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202141983U Expired - Fee Related CN201294489Y (en) | 2008-12-04 | 2008-12-04 | Load circuit, power supply circuit and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201294489Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102170653A (en) * | 2011-04-29 | 2011-08-31 | 中兴通讯股份有限公司 | Base station radio frequency system and protection method of power amplifier |
| CN104734476A (en) * | 2013-12-18 | 2015-06-24 | 乐星产电(无锡)有限公司 | Over-voltage protective device and switching power supply device with same |
| CN103973237B (en) * | 2014-04-30 | 2017-02-22 | 广州钧衡微电子科技有限公司 | Staging overvoltage protection circuit of power amplifier |
| WO2019085256A1 (en) * | 2017-11-01 | 2019-05-09 | 深圳光峰科技股份有限公司 | Power amplification circuit, power amplifier, and laser television |
-
2008
- 2008-12-04 CN CNU2008202141983U patent/CN201294489Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102170653A (en) * | 2011-04-29 | 2011-08-31 | 中兴通讯股份有限公司 | Base station radio frequency system and protection method of power amplifier |
| WO2012146012A1 (en) * | 2011-04-29 | 2012-11-01 | 中兴通讯股份有限公司 | Base station radio frequency system and protection method of radio frequency power amplifier |
| CN104734476A (en) * | 2013-12-18 | 2015-06-24 | 乐星产电(无锡)有限公司 | Over-voltage protective device and switching power supply device with same |
| CN103973237B (en) * | 2014-04-30 | 2017-02-22 | 广州钧衡微电子科技有限公司 | Staging overvoltage protection circuit of power amplifier |
| WO2019085256A1 (en) * | 2017-11-01 | 2019-05-09 | 深圳光峰科技股份有限公司 | Power amplification circuit, power amplifier, and laser television |
| CN109756687A (en) * | 2017-11-01 | 2019-05-14 | 深圳光峰科技股份有限公司 | Power amplifier, amplifirer and laser television |
| CN109756687B (en) * | 2017-11-01 | 2021-11-12 | 深圳光峰科技股份有限公司 | Power amplifier circuit, power amplifier and laser television |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090819 Termination date: 20141204 |
|
| EXPY | Termination of patent right or utility model |