CN202856692U - Power amplification state detection circuit - Google Patents
Power amplification state detection circuit Download PDFInfo
- Publication number
- CN202856692U CN202856692U CN 201220506362 CN201220506362U CN202856692U CN 202856692 U CN202856692 U CN 202856692U CN 201220506362 CN201220506362 CN 201220506362 CN 201220506362 U CN201220506362 U CN 201220506362U CN 202856692 U CN202856692 U CN 202856692U
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- Prior art keywords
- state detection
- circuit
- detection circuit
- voltage stabilizing
- voltage
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Abstract
The utility model provides a power amplification state detection circuit. The power amplification state detection circuit comprises a photoelectric coupler, wherein one end of the photoelectric coupler is connected with electricity, and the other end of the photoelectric coupler is connected with a collector electrode of an audion. An emitting electrode of the audion is connected with the ground through a first resistor. A base electrode of the audion is divided into two circuits, one circuit is connected with the ground through a second resistor, and the other circuit is connected with a first voltage stabilizing diode. A second voltage stabilizing diode is in parallel connection with the first voltage stabilizing diode. A power amplification protection circuit is added to an original control circuit. The power amplification state detection circuit has the advantages of being simple in structure, low in cost and accurate to control and the like.
Description
Technical field
The utility model relates to a kind of circuit, especially relates to the power amplifier state detection circuit.
Background technology
Through design with the communicator (for example cellular device) that transmits in, power amplifier circuit usually in order to amplify the signal of wanting to allow appropriate emission.For instance, power amplifier circuit can be implemented with complementary metal oxide semiconductors (CMOS) (CMOS) technology or bipolar junction transistor (BJT) technology.Power amplifier circuit can comprise two or more cascade gain stages, a driver-level and a power stage.Power stage can comprise CMOS transistor or BJT transistor.Both all have puncture voltage CMOS transistor and BJT transistor, and puncture voltage is in the situation that be exceeded and may cause transistor damage.Puncture voltage is maximum voltage, and it may cause transistor damage when transistorized any two terminals apply striding.Existence can be striden the transistorized drain terminal of CMOS and source terminal and be applied and maybe can stride the maximum voltage that the transistorized collector terminal of BJT and emitter terminal apply.When surpassing puncture voltage, may in transistor, produce avalanche current, described avalanche current causes larger electric current to flow through transistor, and therefore causes heat significantly to increase, and the remarkable increase of described heat may damage transistor and make the transistor performance degradation.If maximum safe working voltage stride any other to transistor terminal (for example grid is to drain voltage or grid to source voltage), transistor then also can occur to be punctured.If grid surpasses corresponding puncture voltage to drain voltage or grid to source voltage, the gate oxide breakdown mode then occurs.When producing conducting path via transistorized gate oxide level to negative electrode from anode, oxide breakdown occurs.When the transistor that is used for power amplifier circuit was damaged, transistor may operate or basic interrupt operation in uncertain mode.Therefore, breakdown voltage transistor occuring in power stage can grievous injury power amplifier circuit reliability.Therefore, when design circuit, to take into full account the protection that how to realize power amplifier.
The utility model content
Problem to be solved in the utility model provides the power amplifier state detection circuit, especially is fit to the overvoltage protection of power amplifier, under-voltage protection, overcurrent protection, overheat protector.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: the power amplifier state detection circuit, comprise photoelectrical coupler, and described photoelectrical coupler one termination electricity, the collector electrode of another termination triode, the emitter of described triode is through the first grounding through resistance; The base stage of described triode is divided two-way, and one the tunnel through the second grounding through resistance; Another road connects the first voltage stabilizing didoe, and the second voltage stabilizing didoe and the first voltage stabilizing didoe are in parallel.
Advantage and the good effect that the utlity model has are: owing to adopting technique scheme, only adopt triode, and voltage stabilizing didoe, resistance is realized.When voltage is high to the overvoltage threshold set the time, drive circuit is closed in the protective circuit action, quits work, and after voltage reaches normal range of operation, automatically recovers to work.Under-voltage protection is identical with overvoltage protection, the under-voltage threshold value that is lower than setting when voltage after death, drive circuit is closed in the protective circuit action, quits work, and after voltage reaches normal range of operation, automatically recovers normal operation.Add the power amplifier protective circuit at original control circuit, have the advantages such as simple in structure, with low cost, that control is accurate.
Description of drawings
Fig. 1 is circuit diagram of the present utility model.
Among the figure:
1, photoelectrical coupler 2, triode 3, the first resistance 4, the second resistance 5, the first voltage stabilizing didoe 6, the second voltage stabilizing didoe
Embodiment
As shown in Figure 1, the utility model provides the power amplifier state detection circuit, comprises photoelectrical coupler 1, described photoelectrical coupler 1 one terminations electricity, and the collector electrode of another termination triode 2, the emitter of described triode 2 is through the first resistance 3 ground connection; The base stage of described triode 2 is divided two-way, and one the tunnel through the second resistance 4 ground connection; Another road connects the first voltage stabilizing didoe 5, and the second voltage stabilizing didoe 6 and the first voltage stabilizing didoe 5 are in parallel.
The course of work of this example: adopt triode, voltage stabilizing didoe, resistance is realized.When voltage is high to the overvoltage threshold set the time, drive circuit is closed in the protective circuit action, quits work, and after voltage reaches normal range of operation, automatically recovers to work.The under-voltage threshold value that is lower than setting when voltage after death, drive circuit is closed in the protective circuit action, quits work, and after voltage reaches normal range of operation, automatically recovers normal operation.Fin at power amplifier is installed NTC, with the temperature of monitoring power amplifier.The NTC two ends connect the control mainboard by cable.On the control mainboard, amplifier is amplified the temperature signal that monitors, and carries out the AD conversion by CPU, determines the temperature value of power amplifier.And temperature information sent to the ARM module, show at display screen.When the temperature of power amplifier is higher than 70 when spending, main power board and standby power board automatically switch.
Above an embodiment of the present utility model is had been described in detail, but described content only is preferred embodiment of the present utility model, can not be considered to be used to limiting practical range of the present utility model.All equalizations of doing according to the utility model application range change and improve etc., all should still belong within the patent covering scope of the present utility model.
Claims (1)
1. power amplifier state detection circuit is characterized in that: comprise photoelectrical coupler (1), and described photoelectrical coupler (1) one termination electricity, the collector electrode of another termination triode (2), the emitter of described triode (2) is through the first resistance (3) ground connection; The base stage of described triode (2) is divided two-way, and one the tunnel through the second resistance (4) ground connection; Another road connects the first voltage stabilizing didoe (5), and the second voltage stabilizing didoe (6) is in parallel with the first voltage stabilizing didoe (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220506362 CN202856692U (en) | 2012-09-28 | 2012-09-28 | Power amplification state detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220506362 CN202856692U (en) | 2012-09-28 | 2012-09-28 | Power amplification state detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202856692U true CN202856692U (en) | 2013-04-03 |
Family
ID=47987838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220506362 Expired - Lifetime CN202856692U (en) | 2012-09-28 | 2012-09-28 | Power amplification state detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202856692U (en) |
-
2012
- 2012-09-28 CN CN 201220506362 patent/CN202856692U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130403 |