JPS57174910A - Overload protecting system for high frequency power amplifier - Google Patents
Overload protecting system for high frequency power amplifierInfo
- Publication number
- JPS57174910A JPS57174910A JP56058608A JP5860881A JPS57174910A JP S57174910 A JPS57174910 A JP S57174910A JP 56058608 A JP56058608 A JP 56058608A JP 5860881 A JP5860881 A JP 5860881A JP S57174910 A JPS57174910 A JP S57174910A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- detected
- output
- circuit
- power amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Amplifiers (AREA)
- Protection Of Static Devices (AREA)
Abstract
PURPOSE: To control for overload protection of a power amplifier, by using a reflection voltage of envelope detection and an average voltage smoothing it, comparing them with each different threshold value and taking logical sum and utilizing the output.
CONSTITUTION: If a detection circuit DET having envelope detection characteristics detects a reflecting voltage of 100% AM modulation as shown in (a), through a failure in a load connected to a terminal Tout, detected voltages 0∼2ec are obtained as the detection output as shown in (b). This detected output is given to a smoothing circuit FIL and a voltage division circuit DIV. The smoothing circuit FIL averages a detected voltage to a modulation minimum frequency as shown in (c) and given an obtained average voltage ec to a corresponding voltage comparator COM-1 as an input to be compared. The circuit DIV divides a detected voltage and gives the divided voltage to a corresponding voltage comparator COM-2 as an input to be compared. An average value and a voltage are obtained from the respective comparator by inputting a reference voltage from a terminal T-V.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56058608A JPS57174910A (en) | 1981-04-20 | 1981-04-20 | Overload protecting system for high frequency power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56058608A JPS57174910A (en) | 1981-04-20 | 1981-04-20 | Overload protecting system for high frequency power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57174910A true JPS57174910A (en) | 1982-10-27 |
Family
ID=13089235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56058608A Pending JPS57174910A (en) | 1981-04-20 | 1981-04-20 | Overload protecting system for high frequency power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57174910A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6066166A (en) * | 1983-09-22 | 1985-04-16 | Nec Corp | Reflected wave power detecting circuit |
| JPS6116314A (en) * | 1984-07-02 | 1986-01-24 | Matsushita Electric Ind Co Ltd | High frequency power supply device |
| JP2005535191A (en) * | 2002-08-01 | 2005-11-17 | テレフォンアクチーボラゲット エル エム エリクソン（パブル） | Power amplification circuit |
| KR100560731B1 (en) * | 2005-05-27 | 2006-03-17 | 주식회사 웨이브일렉트로닉스 | Apparatus for protecting the amplifier from the over input |
| WO2014103420A1 (en) * | 2012-12-27 | 2014-07-03 | 株式会社 東芝 | Digital amplitude modulation device and digital amplitude modulation control method |
-
1981
- 1981-04-20 JP JP56058608A patent/JPS57174910A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6066166A (en) * | 1983-09-22 | 1985-04-16 | Nec Corp | Reflected wave power detecting circuit |
| JPH0374526B2 (en) * | 1983-09-22 | 1991-11-27 | ||
| JPS6116314A (en) * | 1984-07-02 | 1986-01-24 | Matsushita Electric Ind Co Ltd | High frequency power supply device |
| JPH0576045B2 (en) * | 1984-07-02 | 1993-10-21 | Matsushita Electric Ind Co Ltd | |
| JP2005535191A (en) * | 2002-08-01 | 2005-11-17 | テレフォンアクチーボラゲット エル エム エリクソン（パブル） | Power amplification circuit |
| KR100560731B1 (en) * | 2005-05-27 | 2006-03-17 | 주식회사 웨이브일렉트로닉스 | Apparatus for protecting the amplifier from the over input |
| WO2014103420A1 (en) * | 2012-12-27 | 2014-07-03 | 株式会社 東芝 | Digital amplitude modulation device and digital amplitude modulation control method |
| US9654065B2 (en) | 2012-12-27 | 2017-05-16 | Kabushiki Kaisha Toshiba | Digital amplitude modulation device and digital amplitude modulation method |
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