JPH01143285U - - Google Patents
Info
- Publication number
- JPH01143285U JPH01143285U JP1988037775U JP3777588U JPH01143285U JP H01143285 U JPH01143285 U JP H01143285U JP 1988037775 U JP1988037775 U JP 1988037775U JP 3777588 U JP3777588 U JP 3777588U JP H01143285 U JPH01143285 U JP H01143285U
- Authority
- JP
- Japan
- Prior art keywords
- output
- detection circuit
- circuit
- transistor
- reset
- 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
- 238000001514 detection method Methods 0.000 claims description 5
- 230000002265 prevention Effects 0.000 claims description 5
- 230000006641 stabilisation Effects 0.000 claims 1
- 238000011105 stabilization Methods 0.000 claims 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Continuous-Control Power Sources That Use Transistors (AREA)
- Power Conversion In General (AREA)
Description
第１図は本考案のリセツト機能を持つた安定化
電源回路の実施例１、第２図は同実施例２を示す
図、第３図は従来のリセツト機能を持つた安定化
電源回路の回路構成図、第４図は本考案のリセツ
ト機能を持つた安定化電源回路を用いて構成した
マイクロコンピユータのバツクアツプ回路、第５
図は従来のリセツト機能を持つた安定化電源回路
に逆リーク防止用ダイオードを付加して構成した
マイクロコンピユータのバツクアツプ回路、第６
図は、第４図、第５図のバツクアツプ回路のタイ
ミングチヤートである。
１……起動回路、２……基準電圧回路、３……
誤差増幅器、４……出力トランジスタ、５……入
力端子、６……出力端子、７ａ，７ｂ……逆リー
ク防止用トランジスタ、８，９……出力電圧設定
用抵抗、１０……抵抗、１１……トランジスタ、
１２……入力電圧低下検出用コンパレータ、１３
……リセツト出力用トランジスタ、１４……リセ
ツト出力端子、１５……リセツト出力用トランジ
スタ、１６……ＧＮＤ端子、１７，１８……抵抗
、１９……リセツト出力用コンパレータ、２０，
２１……リセツト電圧設定用抵抗、２２……入力
電圧、２３……リセツト機能を持つた安定化電源
回路、２４……入力端子、２５……ＧＮＤ端子、
２６……リセツト出力端子、２７……出力端子、
２８……スーパーキヤパシタ、２９……マイクロ
コンピユータ、３０……レベルシフト用ダイオー
ド、３１……逆リーク防止用ダイオード、３２…
…ダイオード、３３，３４，３５，３６……トラ
ンジスタ、３７，３８……抵抗。
Fig. 1 shows a first embodiment of a stabilized power supply circuit with a reset function according to the present invention, Fig. 2 shows a second embodiment of the same, and Fig. 3 shows a circuit of a conventional stabilized power supply circuit with a reset function. The configuration diagram, Figure 4, is a backup circuit for a microcomputer constructed using the stabilized power supply circuit with a reset function of the present invention.
The figure shows a microcomputer backup circuit constructed by adding a reverse leak prevention diode to a conventional stabilized power supply circuit with a reset function.
This figure is a timing chart of the backup circuit shown in FIGS. 4 and 5. 1... Starting circuit, 2... Reference voltage circuit, 3...
Error amplifier, 4... Output transistor, 5... Input terminal, 6... Output terminal, 7a, 7b... Reverse leak prevention transistor, 8, 9... Resistor for output voltage setting, 10... Resistor, 11... ...transistor,
12... Comparator for input voltage drop detection, 13
...Reset output transistor, 14...Reset output terminal, 15...Reset output transistor, 16...GND terminal, 17, 18...Resistor, 19...Reset output comparator, 20,
21...Reset voltage setting resistor, 22...Input voltage, 23...Stabilized power supply circuit with reset function, 24...Input terminal, 25...GND terminal,
26...Reset output terminal, 27...Output terminal,
28...Super capacitor, 29...Microcomputer, 30...Level shift diode, 31...Reverse leak prevention diode, 32...
...Diode, 33, 34, 35, 36... Transistor, 37, 38... Resistor.
Claims (1)
電圧が出力電圧より低下したことを検出する検出
回路と、出力端子と出力電圧設定用抵抗・リセツ
ト電圧設定用抵抗の接続点の間に位置し前記検出
回路によりオン／オフする逆リーク防止用トラン
ジスタと、出力トランジスタのベースと誤差増幅
器の出力の接続点の間に位置し前記検出回路によ
りオン／オフする逆リーク防止用トランジスタを
備えたリセツト機能付安定化電源回路。 In a stabilized power supply circuit with a reset function, there is a detection circuit that detects that the input voltage has fallen below the output voltage, and a detection circuit that is located between the output terminal and the connection point between the output voltage setting resistor and the reset voltage setting resistor. Stabilization with a reset function, which is equipped with a reverse leak prevention transistor that is turned on and off by the detection circuit, and a reverse leak prevention transistor that is located between the connection point between the base of the output transistor and the output of the error amplifier and turned on and off by the detection circuit. power circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988037775U JPH0726735Y2 (en) | 1988-03-22 | 1988-03-22 | Power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988037775U JPH0726735Y2 (en) | 1988-03-22 | 1988-03-22 | Power supply circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01143285U true JPH01143285U (en) | 1989-10-02 |
| JPH0726735Y2 JPH0726735Y2 (en) | 1995-06-14 |
Family
ID=31264350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988037775U Expired - Lifetime JPH0726735Y2 (en) | 1988-03-22 | 1988-03-22 | Power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0726735Y2 (en) |
-
1988
- 1988-03-22 JP JP1988037775U patent/JPH0726735Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0726735Y2 (en) | 1995-06-14 |
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