JPH01164266A - Dc voltage conversion circuit - Google Patents

Dc voltage conversion circuit

Info

Publication number
JPH01164266A
JPH01164266A JP32472187A JP32472187A JPH01164266A JP H01164266 A JPH01164266 A JP H01164266A JP 32472187 A JP32472187 A JP 32472187A JP 32472187 A JP32472187 A JP 32472187A JP H01164266 A JPH01164266 A JP H01164266A
Authority
JP
Japan
Prior art keywords
voltage
output
circuit
input
vout
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
Application number
JP32472187A
Other languages
Japanese (ja)
Inventor
Sadayuki Shimoda
貞之 下田
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.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments Inc
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 Seiko Instruments Inc filed Critical Seiko Instruments Inc
Priority to JP32472187A priority Critical patent/JPH01164266A/en
Publication of JPH01164266A publication Critical patent/JPH01164266A/en
Pending legal-status Critical Current

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  • Dc-Dc Converters (AREA)

Abstract

PURPOSE:To improve the boosting efficiency of an apparatus by switching the supply voltage of a gate circuit for driving an output transistor from input voltage to output voltage. CONSTITUTION:A DC voltage conversion circuit is fitted with oscillation circuit, comparator 11, NAND circuit 3, output transistor 4, inductor, diode, resistance, capacitor and reference voltage, and further provided with inverter 12 and transmission gates 13-14. Then, when an input voltage Vin is larger than an output voltage Vout, the power of said NAND circuit 3 for driving the output transistor 4 is supplied from the input voltage Vin, while said power is supplied from the output voltage Vout when the output voltage Vout is larger than the input voltage Vin by boosting. Thus, a gate voltage is driven at a high voltage at the point of time of Vin<Vout, so that ON-resistance lowers while efficiency becomes higher.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、直流電圧変換回路に関するものであり、特に
昇圧型の回路であり、その効率を上げるための改良に関
するものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a DC voltage conversion circuit, and in particular to a step-up type circuit, and to improvements to increase the efficiency thereof.

〔発明の概要〕[Summary of the invention]

本発明は従来の直流電圧変換回路の出力トランジスタの
ゲート電圧を入力電圧が出力電圧より大きい時には入力
電圧を、その逆の時には出力電圧を印加する方法を示す
ものであって、これによって、効率の高い直流電圧変換
回路を供給するものである。
The present invention shows a method of applying the input voltage to the gate voltage of the output transistor of the conventional DC voltage conversion circuit when the input voltage is larger than the output voltage, and applying the output voltage when the opposite is the case. It supplies high DC voltage conversion circuits.

〔従来の技術〕[Conventional technology]

従来の直流電圧変換回路、特に昇圧型の変換回路を第2
図に示す。発振回路1は1kHz〜70 k Hz程度
の方形波を発振する。その出力とコンパレータ2の出力
はNAND回路3に入力される。NAND回路3の出力
は出力トランジスタ4のゲートに入力され、そのソース
は接地され、ドレインはVinに接続されたインダクタ
5と共にダイオード6に入力される。そのダイオードの
出力Voutには昇圧された電圧が出力されコンデンサ
7で平滑化される。また出力Voutに接続された抵抗
8,9の接続点はコンパレータ2の負側に、また正側に
は基準電圧10が入力される。
Conventional DC voltage conversion circuits, especially boost type conversion circuits, can be used as secondary voltage converters.
As shown in the figure. The oscillation circuit 1 oscillates a square wave of approximately 1 kHz to 70 kHz. The output thereof and the output of the comparator 2 are input to a NAND circuit 3. The output of the NAND circuit 3 is input to the gate of an output transistor 4, its source is grounded, and its drain is input to a diode 6 together with an inductor 5 connected to Vin. A boosted voltage is output to the output Vout of the diode and smoothed by the capacitor 7. Further, the connection point between the resistors 8 and 9 connected to the output Vout is inputted to the negative side of the comparator 2, and the reference voltage 10 is inputted to the positive side.

以下、動作を説明する。入力電圧Vinが出力電圧Vo
utより大きい時にはコンパレータ2の負側の電圧は基
準電圧10より小さいために、コンパレータ2の出力は
High電圧となり、NAND回路3を通って、出力ト
ランジスタのゲートに、発振回路lの方形波が入力され
、出力トランジスタ4がスイッチングされる。これによ
り、インダクタ5とダイオード6により昇圧現象が起こ
り、Voutの電圧は徐々に上昇し、抵抗8.9で決め
られた出力電圧値に達する。
The operation will be explained below. The input voltage Vin is the output voltage Vo
When the voltage is higher than ut, the voltage on the negative side of the comparator 2 is smaller than the reference voltage 10, so the output of the comparator 2 becomes a High voltage, and the square wave of the oscillation circuit 1 is input to the gate of the output transistor through the NAND circuit 3. and the output transistor 4 is switched. As a result, a step-up phenomenon occurs due to the inductor 5 and the diode 6, and the voltage of Vout gradually increases to reach the output voltage value determined by the resistor 8.9.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

しかし、ここで発振回路、NAND回路及び、コンパレ
ータは入力電圧Vinから供給されているため、入力電
圧Vinが低い時には、出力トランジスタ4のON抵抗
は十分に高くならず、昇圧効率がおちてしまう問題点が
ある。なお、昇圧効率は第2図のような回路構成ではイ
ンダクタの直流抵抗、出力トランジスタのON抵抗及び
ダイオードの順方向電圧降下で決まり、いずれの値も小
さい方が効率が高い。
However, since the oscillation circuit, NAND circuit, and comparator are supplied from the input voltage Vin, when the input voltage Vin is low, the ON resistance of the output transistor 4 is not high enough, resulting in a problem that the boosting efficiency decreases. There is a point. In the circuit configuration shown in FIG. 2, the boosting efficiency is determined by the DC resistance of the inductor, the ON resistance of the output transistor, and the forward voltage drop of the diode, and the smaller the values of any of these, the higher the efficiency.

〔問題点を解決するための手段〕[Means for solving problems]

本発明は従来の技術の問題点を解決することを目的とし
、とりわけ昇圧効率の高い直流電圧変換回路を実現した
The present invention aims to solve the problems of the conventional technology, and has realized a DC voltage conversion circuit with particularly high boost efficiency.

具体的には、入力電圧Vinが出力電圧Voutより大
きい時には、出力トランジスタ4を駆動するNAND回
路3の電源を入力電圧Vinから供給し、入力電圧Vi
nより出力電圧Voutが昇圧によって大きくなった時
には、出力電圧Voutから供給するものである。
Specifically, when the input voltage Vin is larger than the output voltage Vout, the power of the NAND circuit 3 that drives the output transistor 4 is supplied from the input voltage Vin, and the input voltage Vi
When the output voltage Vout becomes larger than n due to boosting, the voltage is supplied from the output voltage Vout.

〔実施例〕〔Example〕

以下図面に従って本発明の実施例を詳細に説明する。第
1図において発振回路1、コンパレータ2、インダクタ
5、ダイオード6、抵抗8.9、コンデンサ7、基準電
圧lOは同等な結線であるため省略する。従ってvlに
は発振回路1の出力、■、にはコンパレータ2の出力が
それぞれ人力される。コンパレータ11の正側入力には
入力電圧■in、負側入力には出力電圧Voutが入力
され、該出力はインバータ12とトランスミッションゲ
ート13に入力される。また、インバータ12の出力は
やはり、トランスミッションゲート14に入力される。
Embodiments of the present invention will be described in detail below with reference to the drawings. In FIG. 1, the oscillation circuit 1, the comparator 2, the inductor 5, the diode 6, the resistor 8.9, the capacitor 7, and the reference voltage lO are omitted because they are connected in the same way. Therefore, the output of the oscillation circuit 1 is applied to vl, and the output of the comparator 2 is applied to . The input voltage ■in is input to the positive input of the comparator 11, the output voltage Vout is input to the negative input, and the output is input to the inverter 12 and the transmission gate 13. Further, the output of the inverter 12 is also input to the transmission gate 14.

各トランスミッションゲートの一方には、入力電圧Vi
nと出力電圧Voutが接続され、両トランスミッショ
ンゲートの他方は接続され、NAND回路3の電源に接
続されている。
One of each transmission gate has an input voltage Vi
n and the output voltage Vout are connected, and the other of both transmission gates is connected to the power supply of the NAND circuit 3.

次に、第1図の回路動作を説明する。入力電圧Vin>
出力電圧Voutの時には、コンパレータ11の出力は
High電圧となり、トランスミッションゲート13を
ONさせ、他方、インバータ12により、トランスミソ
シッンゲー)14はOFFされる。このため、NAND
回路3の電源は入力電圧Vinが供給される。一方、入
力電圧Vin<出力電圧Voutになった時点ではコン
パレータ11の出力はLow電圧となり、トランスミッ
ションゲート13はOFFとなり、トランスミッション
ゲート14はONする。
Next, the operation of the circuit shown in FIG. 1 will be explained. Input voltage Vin>
When the output voltage is Vout, the output of the comparator 11 becomes a High voltage, turning on the transmission gate 13, and on the other hand, the inverter 12 turns off the transmission gate 14. For this reason, NAND
The power supply of the circuit 3 is supplied with the input voltage Vin. On the other hand, when the input voltage Vin<output voltage Vout, the output of the comparator 11 becomes a low voltage, the transmission gate 13 is turned off, and the transmission gate 14 is turned on.

このため、NAND回路3の電源は出力電圧Voutか
ら供給される。これによりて、出力トランジスタ4のゲ
ート電圧はVin<Voutになった時点で高電圧で駆
動されるため、該ON抵抗は低くなり、昇圧効率が上が
る。
Therefore, the power to the NAND circuit 3 is supplied from the output voltage Vout. As a result, the gate voltage of the output transistor 4 is driven at a high voltage when Vin<Vout, so the ON resistance is lowered and the boosting efficiency is increased.

〔発明の効果〕〔Effect of the invention〕

以上述べた。ように本発明によれば出力トランジスタを
駆動するゲート回路の電源電圧を入力電圧から、出力電
圧に切り換えることによって、出力トランジスタのON
抵抗を低くすることができるため、昇圧効率を上げられ
るという効果がある。
As stated above. According to the present invention, the output transistor is turned on by switching the power supply voltage of the gate circuit that drives the output transistor from the input voltage to the output voltage.
Since the resistance can be lowered, the boost efficiency can be increased.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の直流電圧変換回路の切り換え部分の回
路図、第2図は従来の直流電圧変換回路図である。 1・・・・・発振回路 2.11・・・コンパレータ 3・・・・・NAND回路 4・・・・・出力トランジスタ 13、14・・・トランスミッションゲート以上 出願人 セイコー電子工業株式会社
FIG. 1 is a circuit diagram of a switching portion of a DC voltage conversion circuit according to the present invention, and FIG. 2 is a diagram of a conventional DC voltage conversion circuit. 1...Oscillation circuit 2.11...Comparator 3...NAND circuit 4...Output transistors 13, 14...Transmission gate and above Applicant: Seiko Electronic Industries, Ltd.

Claims (1)

【特許請求の範囲】[Claims] 発振回路とコンパレータと基準電圧とインダクタとダイ
オードと出力トランジスタと抵抗とゲート回路とコンデ
ンサからなる直流電圧変換回路において、新たにコンパ
レータとインバータ及びトランスミッションゲートから
なる回路を付加し、該回路によって、前記ゲート回路へ
供給する電源電圧に入力電圧が出力電圧より大きい時に
は入力電圧をその逆の時には出力電圧を用いることを特
徴とする直流電圧変換回路。
In a DC voltage conversion circuit consisting of an oscillation circuit, a comparator, a reference voltage, an inductor, a diode, an output transistor, a resistor, a gate circuit, and a capacitor, a new circuit consisting of a comparator, an inverter, and a transmission gate is added, and by this circuit, the gate A DC voltage conversion circuit characterized in that when the input voltage is greater than the output voltage, the input voltage is used as the power supply voltage supplied to the circuit, and when the opposite is the case, the output voltage is used.
JP32472187A 1987-12-21 1987-12-21 Dc voltage conversion circuit Pending JPH01164266A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP32472187A JPH01164266A (en) 1987-12-21 1987-12-21 Dc voltage conversion circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP32472187A JPH01164266A (en) 1987-12-21 1987-12-21 Dc voltage conversion circuit

Publications (1)

Publication Number Publication Date
JPH01164266A true JPH01164266A (en) 1989-06-28

Family

ID=18168969

Family Applications (1)

Application Number Title Priority Date Filing Date
JP32472187A Pending JPH01164266A (en) 1987-12-21 1987-12-21 Dc voltage conversion circuit

Country Status (1)

Country Link
JP (1) JPH01164266A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5653395A (en) * 1993-05-13 1997-08-05 Toray Engineering Co., Ltd. Yarn winding method and apparatus and package formed thereby
US7741818B2 (en) 2006-06-26 2010-06-22 Ricoh Company, Ltd. Voltage regulator including an output unit for converting input voltage into a predetermined voltage and for outputting the converted voltage
CN113131740A (en) * 2019-12-31 2021-07-16 华润微集成电路(无锡)有限公司 Control voltage switching circuit and corresponding booster circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5653395A (en) * 1993-05-13 1997-08-05 Toray Engineering Co., Ltd. Yarn winding method and apparatus and package formed thereby
US7741818B2 (en) 2006-06-26 2010-06-22 Ricoh Company, Ltd. Voltage regulator including an output unit for converting input voltage into a predetermined voltage and for outputting the converted voltage
CN113131740A (en) * 2019-12-31 2021-07-16 华润微集成电路(无锡)有限公司 Control voltage switching circuit and corresponding booster circuit

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