JPH05268028A - Switching circuit - Google Patents

Switching circuit

Info

Publication number
JPH05268028A
JPH05268028A JP3995392A JP3995392A JPH05268028A JP H05268028 A JPH05268028 A JP H05268028A JP 3995392 A JP3995392 A JP 3995392A JP 3995392 A JP3995392 A JP 3995392A JP H05268028 A JPH05268028 A JP H05268028A
Authority
JP
Japan
Prior art keywords
gate
channel fet
conductive
circuit
fet
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.)
Withdrawn
Application number
JP3995392A
Other languages
Japanese (ja)
Inventor
Naoyuki Tanabe
直行 田辺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP3995392A priority Critical patent/JPH05268028A/en
Publication of JPH05268028A publication Critical patent/JPH05268028A/en
Withdrawn legal-status Critical Current

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  • Dc-Dc Converters (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE:To improve the efficiency by extending a gate charge time for gates of P-channel FET and an N-channel FET more than the discharge time and making the other FET conductive after the one FET is not conductive. CONSTITUTION:A level conversion circuit 2 converts a voltage of a logic control signal from a control input terminal 1 into a level controlling FETs Q2, Q3 of the switching circuit 3. A resistor R2 limits a current between an output of the circuit 2 and a gate of the Q2. A diode D1 is conductive when an output voltage level of the circuit 2 is higher than a gate voltage level of the Q2 and not conductive when lower. A resistor R3 limits a current between an output of the circuit 2 and a gate of the Q3. A diode D2 is conductive when an output voltage level of the circuit 2 is lower than the gate voltage level of the Q2 and not conductive when higher. Since the timing of a change in the state of the drain and source of the Q2, Q3 from the nonconductive into the conductive state is delayed, simultaneous conduction of the Q2, Q3 is avoided and flowing of an undesired large current is avoided. Thus, the efficiency of the switching circuit is improved.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明はスイッチング回路に関
し、特に電源装置のスイッチングレギュレータに使用す
るスイッチング回路に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching circuit, and more particularly to a switching circuit used for a switching regulator of a power supply device.

【0002】[0002]

【従来の技術】図2は従来のスイッチング回路の一例の
回路図、図3は従来例における動作のタイミングチャー
トである。
2. Description of the Related Art FIG. 2 is a circuit diagram of an example of a conventional switching circuit, and FIG. 3 is a timing chart of the operation in the conventional example.

【0003】従来例は図2において、ソースをGNDに
接続されゲートを制御入力端子11に接続されたNチャ
ンネルFETQ11と、電源VDDとNチャンネルFE
TQ11のドレインとの間に接続された抵抗R11と、
ソースが電源VDDに接続されたPチャンネルFETQ
12のゲートとソースがGNDに接続されたNチャンネ
ルFETQ13のゲートが共通にFETQ11のドレイ
ンに接続され、出力がスイッチング出力端子14に接続
されていた。
In the conventional example shown in FIG. 2, an N-channel FET Q11 having a source connected to GND and a gate connected to a control input terminal 11, a power supply VDD and an N-channel FE.
A resistor R11 connected between the drain of TQ11 and
P-channel FET Q whose source is connected to the power supply VDD
The gate of N-channel FET Q13 whose gate and source are connected to GND is commonly connected to the drain of FET Q11, and the output is connected to the switching output terminal 14.

【0004】[0004]

【発明が解決しようとする課題】上述した従来のスイッ
チング回路は、ソースが電源に接続されたPチャンネル
FETのゲートとソースがGNDに接続されたNチャン
ネルFETのゲートに共通に制御信号を入力するため、
図3に示すようにしきい値電圧が異なるPチャンネルF
ETとNチャンネルFETとが同時に導通状態になる期
間が発生し大電流が流れるという問題点があった。
In the conventional switching circuit described above, the control signal is commonly input to the gate of the P-channel FET whose source is connected to the power supply and the gate of the N-channel FET whose source is connected to GND. For,
As shown in FIG. 3, P-channel F with different threshold voltage
There has been a problem that a large current flows due to a period in which the ET and the N-channel FET are simultaneously turned on.

【0005】[0005]

【課題を解決するための手段】本発明のスイッチング回
路は、スイッチングが制御される制御信号を受ける制御
入力端子と、ソースを電源の一端に接続されたPチャン
ネルFETと、ソースを電源の他端に接続されたNチャ
ネルFETと、前記PチャンネルFETのゲートと制御
入力端子の間に接続された第1の抵抗と、カソード側を
前記PチャンネルFETのゲートに接続されアノード側
が前記制御入力端子に接続された第1のダイオードと、
前記NチャンネルFETのゲートと制御入力端子の間に
接続された第2の抵抗と、アノード側を前記Nチャンネ
ルFETのゲートに接続されたカソード側が前記制御入
力端子に接続された第2のダイオードと、前記Pチャン
ネルFETのドレインと前記NチャンネルFETのドレ
インとに接続されたスイッチング出力端子とを備え、前
記PチャンネルFETと前記NチャンネルFETのゲー
ト充電時間を放電時間より長くして一方のFETが非導
通になった後に他方のFETが導通するように構成され
る。
A switching circuit according to the present invention comprises a control input terminal for receiving a control signal for controlling switching, a P-channel FET having a source connected to one end of a power supply, and a source connected to the other end of the power supply. Connected to the N channel FET, a first resistor connected between the gate of the P channel FET and the control input terminal, and a cathode side connected to the gate of the P channel FET and an anode side connected to the control input terminal. A first diode connected,
A second resistor connected between the gate of the N-channel FET and the control input terminal; and a second diode whose anode side is connected to the gate of the N-channel FET and whose cathode side is connected to the control input terminal. A switching output terminal connected to the drain of the P-channel FET and the drain of the N-channel FET, wherein the gate charging time of the P-channel FET and the N-channel FET is made longer than the discharging time, and one FET is It is configured so that the other FET becomes conductive after becoming non-conductive.

【0006】[0006]

【実施例】次に本発明について図面を説明して説明す
る。図1は本発明の一実施例を示す回路図、図4は本実
施例の動作のタイミングチャートである。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described with reference to the drawings. FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 4 is a timing chart of the operation of this embodiment.

【0007】本実施例は、制御入力端子1と、制御入力
端子1からの制御信号を受けて制御信号の電圧レベルを
変換して出力するレベル変換回路2と、レベル変換回路
2の出力を受けて電源VDDをスイッチングするスイッ
チング回路3と、スイッチング回路3の出力を外部に出
力するスイッチング出力端子4とを備えている。
This embodiment receives a control input terminal 1, a level conversion circuit 2 for receiving a control signal from the control input terminal 1 and converting and outputting the voltage level of the control signal, and an output of the level conversion circuit 2. A switching circuit 3 for switching the power supply VDD by means of a power supply, and a switching output terminal 4 for outputting the output of the switching circuit 3 to the outside.

【0008】レベル変換回路2は、ソースをGNDに接
続されゲートを制御入力端子1に接続されたNチャンネ
ルFETQ1と、電源VDDとNチャンネルFETQ1
のドレインとの間に接続された抵抗R1とから構成され
ている。
The level conversion circuit 2 has an N-channel FET Q1 having a source connected to GND and a gate connected to the control input terminal 1, a power supply VDD and an N-channel FET Q1.
And a resistor R1 connected between the drain and the drain.

【0009】スイッチング回路3はソースを電源に接続
されたPチャンネルFETQ2と、ソースをGNDに接
続されたNチャンネルFETQ3と、PチャンネルFE
TQE2のゲートとレベル変換回路2の出力に接続され
た抵抗R2と、カソード側をPチャンネルFETQ2の
ゲートに接続されたアノード側をレベル変換回路2の出
力に接続されたダイオードD1と、NチャンネルFET
Q3のゲートとレベル変換回路2の出力に接続された抵
抗R3と、アノード側をNチャンネルFETQ3のゲー
トに接続されカソード側をレベル変換回路2の出力に接
続されたダイオードD2とから構成されている。スイッ
チング出力端子4はPチャンネルFETQ2のドレイン
とNチャンネルFETQ3のドレインに接続されてい
る。
The switching circuit 3 has a P-channel FET Q2 whose source is connected to a power source, an N-channel FET Q3 whose source is connected to GND, and a P-channel FE.
A resistor R2 connected to the gate of TQE2 and the output of the level conversion circuit 2, a diode D1 having its cathode side connected to the gate of the P-channel FET Q2 and its anode side connected to the output of the level conversion circuit 2, and an N-channel FET.
It is composed of a resistor R3 connected to the gate of Q3 and the output of the level conversion circuit 2, and a diode D2 whose anode side is connected to the gate of the N-channel FET Q3 and whose cathode side is connected to the output of the level conversion circuit 2. . The switching output terminal 4 is connected to the drain of the P-channel FET Q2 and the drain of the N-channel FET Q3.

【0010】このように構成された本実施例によれば、
レベル変換回路2は制御入力端子1から入力されるロジ
ックう制御信号(GND−5v)の電圧をスイッチング
回路3のFETQ2及びQ3を制御するのに必要なレベ
ル(GND−VDD)に変換する。抵抗R2はレベル変
換回路2の出力とFETQ2のゲートとの間に流れる電
流を制限する。ダイオードD1はレベル変換回路2の出
力電力レベルがFETQ2のゲート電圧レベルより高け
れば導通しレベル変換回路2の出力電圧レベル変換回路
2の出力電圧レベルがFETQ2のゲート電圧レベルよ
り低ければ導通しない。
According to the present embodiment configured as described above,
The level conversion circuit 2 converts the voltage of the logic control signal (GND-5v) input from the control input terminal 1 into a level (GND-VDD) required to control the FETs Q2 and Q3 of the switching circuit 3. The resistor R2 limits the current flowing between the output of the level conversion circuit 2 and the gate of the FET Q2. Diode D1 conducts when the output power level of level conversion circuit 2 is higher than the gate voltage level of FET Q2, and does not conduct when the output voltage level of output voltage level conversion circuit 2 of level conversion circuit 2 is lower than the gate voltage level of FET Q2.

【0011】抵抗R3はレベル変換回路2の出力とFE
TQ3のゲートとの間に流れる電流を制限する。ダイオ
ードD2はレベル変換回路2の出力電圧レベルがFET
Q2のゲート電圧レベルより低ければ導通しレベル変換
回路2の出力電圧レベルがFETQ2のゲート電圧レベ
ルより高ければ導通しない。即ち抵抗R2及びダイオー
ドD1は、PチャンネルFETQ2のゲート充電方向の
み電流を制限し、抵抗R3及びダイオードD2は、Nチ
ャンネルFETQ3のゲートの充電方向のみ電流を制限
する。また、FETQ2及びQ3はゲートが充電状態の
時ドレイン−ソース間が導通状態になる。従ってFET
Q2及びQ3はドレイン−ソース間が非同数状態から導
通状態に変化するタイミングが遅れるためFETQ2,
Q3が同時に導通状態になる期間がなくなるので不要な
大電流が流れなくなる。
The resistor R3 is connected to the output of the level conversion circuit 2 and FE.
It limits the current that flows between it and the gate of TQ3. The output voltage level of the level conversion circuit 2 is FET
If it is lower than the gate voltage level of Q2, it conducts, and if the output voltage level of the level conversion circuit 2 is higher than the gate voltage level of FET Q2, it does not conduct. That is, the resistor R2 and the diode D1 limit the current only in the gate charging direction of the P-channel FET Q2, and the resistor R3 and the diode D2 limit the current only in the charging direction of the N-channel FET Q3 gate. Further, when the gates of the FETs Q2 and Q3 are in a charged state, the drain and the source are in a conductive state. Therefore FET
FETs Q2 and Q3 have FETs Q2 and Q3 because the timing of changing from the non-equal number between the drain and the source to the conductive state is delayed.
Since there is no period when Q3 is in the conducting state at the same time, unnecessary large current does not flow.

【0012】[0012]

【発明の効果】以上説明したように本発明は、スイッチ
ング用のPチャンネルFETとNチャンネルFETのゲ
ート充電時間を放電時間より長くし一方のFETが非導
通になった後に他方のFETを導通させることにより、
スイッチング時の不要な大電流のなくしてスイッチング
回路の効率向上がはかれる効果を有する。
As described above, according to the present invention, the gate charging time of the switching P-channel FET and the N-channel FET is made longer than the discharging time, and the other FET is made conductive after the other is made non-conductive. By
There is an effect that the efficiency of the switching circuit can be improved by eliminating an unnecessary large current at the time of switching.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例を示す回路図である。FIG. 1 is a circuit diagram showing an embodiment of the present invention.

【図2】従来のスイッチング回路の一例を示す回路図で
ある。
FIG. 2 is a circuit diagram showing an example of a conventional switching circuit.

【図3】従来例における動作のタイミングチャートであ
る。
FIG. 3 is a timing chart of the operation in the conventional example.

【図4】本実施例における動作のタイミングチャートで
ある。
FIG. 4 is a timing chart of the operation in this embodiment.

【符号の説明】[Explanation of symbols]

1 制御入力端子 2 レベル変換回路 3 スイッチング回路 4 スイッチング出力端子 1 Control input terminal 2 Level conversion circuit 3 Switching circuit 4 Switching output terminal

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 スイッチングが制御される制御信号を受
ける制御入力端子と、ソースを電源の一端に接続された
PチャンネルFETと、ソースを電源の他端に接続され
たNチャネルFETと、前記PチャンネルFETのゲー
トと制御入力端子の間に接続された第1の抵抗と、カソ
ード側を前記PチャンネルFETのゲートに接続されア
ノード側が前記制御入力端子に接続された第1のダイオ
ードと、前記NチャンネルFETのゲートと制御入力端
子の間に接続された第2の抵抗と、アノード側を前記N
チャンネルFETのゲートに接続されたカソード側が前
記制御入力端子に接続された第2のダイオードと、前記
PチャンネルFETのドレインと前記NチャンネルFE
Tのドレインとに接続されたスイッチング出力端子とを
備えることを特徴とするスイッチング回路。
1. A control input terminal for receiving a control signal for controlling switching, a P-channel FET having a source connected to one end of a power source, an N-channel FET having a source connected to the other end of the power source, and the P-channel FET. A first resistor connected between the gate of the channel FET and the control input terminal; a first diode whose cathode side is connected to the gate of the P channel FET and whose anode side is connected to the control input terminal; The second resistor connected between the gate of the channel FET and the control input terminal and the anode side are connected to the N
A second diode whose cathode side connected to the gate of the channel FET is connected to the control input terminal, a drain of the P-channel FET and the N-channel FE
A switching circuit comprising a switching output terminal connected to the drain of T.
JP3995392A 1992-02-27 1992-02-27 Switching circuit Withdrawn JPH05268028A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3995392A JPH05268028A (en) 1992-02-27 1992-02-27 Switching circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3995392A JPH05268028A (en) 1992-02-27 1992-02-27 Switching circuit

Publications (1)

Publication Number Publication Date
JPH05268028A true JPH05268028A (en) 1993-10-15

Family

ID=12567326

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3995392A Withdrawn JPH05268028A (en) 1992-02-27 1992-02-27 Switching circuit

Country Status (1)

Country Link
JP (1) JPH05268028A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10296033B2 (en) 2016-06-08 2019-05-21 Panasonic Corporation Substrate voltage control circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10296033B2 (en) 2016-06-08 2019-05-21 Panasonic Corporation Substrate voltage control circuit

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Effective date: 19990518