JP2003188693A5 - - Google Patents
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- JP2003188693A5 JP2003188693A5 JP2001387087A JP2001387087A JP2003188693A5 JP 2003188693 A5 JP2003188693 A5 JP 2003188693A5 JP 2001387087 A JP2001387087 A JP 2001387087A JP 2001387087 A JP2001387087 A JP 2001387087A JP 2003188693 A5 JP2003188693 A5 JP 2003188693A5
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- capacitor
- capacitance
- maximum
- voltage
- oscillation signal
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Description
【００１２】
【発明の効果】
本発明によれば、定電流で充放電するコンデンサの端子間電圧を三角波信号として出力するＰＷＭ制御に用いる発振回路において、コンデンサを第1コンデンサと、スイッチを介した第２コンデンサとの並列回路で構成し、第１コンデンサの容量を第２コンデンサの容量より小さく設定するとともに、発振信号の電圧振幅の最小値と最大値間に閾値電圧を設定し、端子間電圧が閾値電圧以上のとき、スイッチをＯＦＦ制御して、第1コンデンサのみを充放電し、このときの発振信号を用いてＰＷＭ制御の最大オン・デューティ比を決定するようにしているので、発振信号の周波数が高くなり、発振信号の振幅が大きくなっても、最大オン・デューティ比が低くなるのを低減することができる。また、発振回路を半導体集積回路で構成する場合、外付けコンデンサ用端子を従来よりも１個増やすだけで、第１コンデンサの容量と第２コンデンサの容量を調整することにより最大オン・デューティ比を外部調整できる。[0012]
【Effect of the invention】
According to the present invention, in the oscillation circuit used for PWM control that outputs as the triangular wave signal the voltage between the terminals of the capacitor that is charged and discharged with a constant current, the capacitor is a parallel circuit of a first capacitor and a second capacitor via a switch. The capacitance of the first capacitor is set smaller than the capacitance of the second capacitor, and the threshold voltage is set between the minimum value and the maximum value of the voltage amplitude of the oscillation signal, and the switch is used when the voltage between terminals is equal to or more than the threshold voltage. Is controlled so that only the first capacitor is charged and discharged, and the maximum on-duty ratio of PWM control is determined using the oscillation signal at this time, so the frequency of the oscillation signal becomes high, and the oscillation signal becomes The reduction of the maximum on-duty ratio can be reduced even if the amplitude of the. In addition, when the oscillation circuit is configured by a semiconductor integrated circuit, the maximum on-duty ratio can be obtained by adjusting the capacitance of the first capacitor and the capacitance of the second capacitor only by increasing the number of external capacitor terminals by one compared to the prior art. Externally adjustable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001387087A JP3914047B2 (en) | 2001-12-20 | 2001-12-20 | Oscillator circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001387087A JP3914047B2 (en) | 2001-12-20 | 2001-12-20 | Oscillator circuit |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2003188693A JP2003188693A (en) | 2003-07-04 |
| JP2003188693A5 true JP2003188693A5 (en) | 2005-03-17 |
| JP3914047B2 JP3914047B2 (en) | 2007-05-16 |
Family
ID=27596023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001387087A Expired - Fee Related JP3914047B2 (en) | 2001-12-20 | 2001-12-20 | Oscillator circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3914047B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7034586B2 (en) * | 2004-03-05 | 2006-04-25 | Intersil Americas Inc. | Startup circuit for converter with pre-biased load |
| JP2006333589A (en) * | 2005-05-25 | 2006-12-07 | Mitsumi Electric Co Ltd | Switching power supply device and its control method |
| DE112006002710B4 (en) | 2005-10-17 | 2016-02-11 | Autonetworks Technologies, Ltd. | PWM signal generator |
| DE112006002885B8 (en) | 2005-10-31 | 2016-01-14 | Autonetworks Technologies, Ltd. | Power supply controller |
| JP2008054220A (en) * | 2006-08-28 | 2008-03-06 | Rohm Co Ltd | Pulse generator, electronic device using the same and pulse generating method |
| JP6087670B2 (en) * | 2013-03-08 | 2017-03-01 | 新日本無線株式会社 | Pulse generation circuit |
| JP7206062B2 (en) * | 2018-06-19 | 2023-01-17 | 新電元工業株式会社 | Oscillator circuit and method of controlling the oscillator circuit |
| FR3082959A1 (en) | 2018-06-26 | 2019-12-27 | Stmicroelectronics (Rousset) Sas | CYCLIC CONTROL OF CELLS OF AN INTEGRATED CIRCUIT |
-
2001
- 2001-12-20 JP JP2001387087A patent/JP3914047B2/en not_active Expired - Fee Related
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