JPH0488385U - - Google Patents
Info
- Publication number
- JPH0488385U JPH0488385U JP12971890U JP12971890U JPH0488385U JP H0488385 U JPH0488385 U JP H0488385U JP 12971890 U JP12971890 U JP 12971890U JP 12971890 U JP12971890 U JP 12971890U JP H0488385 U JPH0488385 U JP H0488385U
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- circuit
- power supply
- switching element
- supply device
- 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.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 7
- 238000007493 shaping process Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Dc-Dc Converters (AREA)
Description
第１図は本考案の実施例に係わるスイツチング
電源装置を示す回路図、第２図は第１図の回路の
ＦＥＴのドレイン・ソース間電圧とドレイン電流
とゲート・ソース間電圧を示す波形図、第３図は
従来回路の制御電圧を示す波形図、第４図は第２
の実施例のスイツチング電源装置を示す回路図で
ある。
１……直流電源、２……トランス、３……１次
巻線、４……ＦＥＴ、５……電流検出抵抗、１２
……ＮＯＴ回路、１３……コンデンサ、１６……
コンデンサ充放電制御回路。
FIG. 1 is a circuit diagram showing a switching power supply device according to an embodiment of the present invention, FIG. 2 is a waveform diagram showing the drain-source voltage, drain current, and gate-source voltage of the FET of the circuit in FIG. Figure 3 is a waveform diagram showing the control voltage of the conventional circuit, and Figure 4 is the waveform diagram showing the control voltage of the conventional circuit.
FIG. 2 is a circuit diagram showing a switching power supply device according to an embodiment of the present invention. 1...DC power supply, 2...Transformer, 3...Primary winding, 4...FET, 5...Current detection resistor, 12
...NOT circuit, 13... Capacitor, 16...
Capacitor charge/discharge control circuit.
Claims (1)
トランス又はリアクトルとスイツチング素子との
直列回路と、 前記トランス又はリアクトルを介して出力電圧
を得るように接続された出力回路と、 前記スイツチング素子に流れる電流を検出する
電流検出器と、 コンデンサと、 前記電流検出器から得られる電流検出電圧が所
定レベルに達したことに応答して前記コンデンサ
を充電又は放電させ、その後前記コンデンサを時
定数を有して放電又は充電させるコンデンサ充放
電制御回路と、 を有し、前記コンデンサの電圧に基づいて前記ス
イツチング素子をオン・オフ制御するように構成
されていることを特徴とするスイツチング電源装
置。 (2) 更に、前記スイツチング素子の制御端子と
前記コンデンサとの間に波形整形又はＮＯＴ回路
が接続されていることを特徴とする請求項１記載
のスイツチング電源装置。 (3) 前記コンデンサ充放電制御回路は、 前記電流検出器から得られる電流検出電圧が所
定レベルに達したことに応答してオンになる電流
検出用スイツチング素子と、 前記電流検出用スイツチング素子の端子電圧に
応答するコンデンサ制御用ＮＯＴ回路と、 前記コンデンサ制御用ＮＯＴ回路の出力端子に
接続されたダイオードと放電時定数決定用素子と
の並列回路と から成り、前記コンデンサは前記コンデンサ制御
用ＮＯＴ回路の出力端子と共通電源端子との間に
前記並列回路を介して接続されていることを特徴
とする請求項１又は２記載のスイツチング電源装
置。 (4) 更に、前記出力回路の出力電圧を調整する
ために前記電流検出用スイツチング素子のターン
オン時点を制御する回路が前記電流検出用スイツ
チング素子の制御端子に接続されていることを特
徴とする請求項３記載のスイツチング電源装置。 (5) 更に、前記出力回路の出力電圧を調整する
ために前記放電時定数決定用素子が可変抵抗素子
であることを特徴とする請求項３記載のスイツチ
ング電源装置。[Claims for Utility Model Registration] (1) A series circuit of a transformer or reactor and a switching element connected between one end and the other end of a DC power source, and an output voltage is obtained through the transformer or reactor. a connected output circuit; a current detector that detects a current flowing through the switching element; a capacitor; and a capacitor that charges or charges the capacitor in response to a current detection voltage obtained from the current detector reaching a predetermined level. a capacitor charge/discharge control circuit that discharges the capacitor and then discharges or charges the capacitor with a time constant, and is configured to control on/off of the switching element based on the voltage of the capacitor. A switching power supply device characterized by: (2) The switching power supply device according to claim 1, further comprising a waveform shaping or NOT circuit connected between the control terminal of the switching element and the capacitor. (3) The capacitor charge/discharge control circuit includes: a current detection switching element that is turned on in response to the current detection voltage obtained from the current detector reaching a predetermined level; and a terminal of the current detection switching element. It consists of a capacitor control NOT circuit that responds to voltage, and a parallel circuit of a diode and a discharge time constant determining element connected to the output terminal of the capacitor control NOT circuit, and the capacitor is connected to the capacitor control NOT circuit. 3. The switching power supply device according to claim 1, wherein the switching power supply device is connected between the output terminal and the common power supply terminal via the parallel circuit. (4) A claim further characterized in that a circuit for controlling a turn-on point of the current detection switching element is connected to a control terminal of the current detection switching element in order to adjust the output voltage of the output circuit. The switching power supply device according to item 3. (5) The switching power supply device according to claim 3, further characterized in that the discharge time constant determining element is a variable resistance element in order to adjust the output voltage of the output circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990129718U JP2547602Y2 (en) | 1990-11-30 | 1990-11-30 | Switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990129718U JP2547602Y2 (en) | 1990-11-30 | 1990-11-30 | Switching power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0488385U true JPH0488385U (en) | 1992-07-31 |
| JP2547602Y2 JP2547602Y2 (en) | 1997-09-10 |
Family
ID=31877109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990129718U Expired - Lifetime JP2547602Y2 (en) | 1990-11-30 | 1990-11-30 | Switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2547602Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02136066A (en) * | 1988-11-14 | 1990-05-24 | Sanken Electric Co Ltd | Switching regulator |
-
1990
- 1990-11-30 JP JP1990129718U patent/JP2547602Y2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02136066A (en) * | 1988-11-14 | 1990-05-24 | Sanken Electric Co Ltd | Switching regulator |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2547602Y2 (en) | 1997-09-10 |
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