JP2012132709A - Low voltage protection circuit - Google Patents

Low voltage protection circuit Download PDF

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JP2012132709A
JP2012132709A JP2010283084A JP2010283084A JP2012132709A JP 2012132709 A JP2012132709 A JP 2012132709A JP 2010283084 A JP2010283084 A JP 2010283084A JP 2010283084 A JP2010283084 A JP 2010283084A JP 2012132709 A JP2012132709 A JP 2012132709A
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JP5434896B2 (en
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Hideyuki Takenobu
英行 武信
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Mitsubishi Electric Corp
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Abstract

PROBLEM TO BE SOLVED: To obtain a low voltage protection circuit capable of carrying out correct low voltage protection while reducing power consumption.SOLUTION: A resistance voltage-dividing circuit 10 resistance-divides the voltage of a power supply. A voltage comparison circuit CP1 compares the output voltage of the resistance voltage-dividing circuit 10 with reference voltage. A charging/discharging circuit 12 charges a capacitance C1 when the output voltage is lower than the reference voltage, and discharge the capacitance C1 when the output voltage is higher than the reference voltage. An inverter INV1 reverses the voltage of the other end of the capacitance C1. An AND circuit 14 carries out AND computing of an output signal and a main signal of the inverter INV1. A switch P1 stops power supply to the charging/discharging circuit 12 when the main signal is L. A switch P3 charges the capacitance C1 when the main signal is L.

Description

本発明は、消費電力を削減しつつ、正しい低電圧保護を行うことができる低電圧保護回路に関する。   The present invention relates to a low voltage protection circuit capable of performing correct low voltage protection while reducing power consumption.

ドライバー回路は、マイコンなどの外部装置から入力されるメイン信号に基づいて、パワーMOSFETやIGBTなどの外部負荷を駆動する駆動信号を出力する。ドライバー回路に供給される電源電圧が低下した場合、駆動信号の振幅が十分でない状態で外部負荷が駆動されてしまう。これを防止するため、ドライバー回路は、電源電圧が所定の値より大きいか否かを判定するUV判定を行う低電圧保護回路を有する。低電圧保護回路は、電源電圧が所定電圧より低い場合には、メイン信号の論理に関わらず強制的に駆動信号を遮断する。   The driver circuit outputs a drive signal for driving an external load such as a power MOSFET or IGBT based on a main signal input from an external device such as a microcomputer. When the power supply voltage supplied to the driver circuit decreases, the external load is driven in a state where the amplitude of the drive signal is not sufficient. In order to prevent this, the driver circuit includes a low voltage protection circuit that performs UV determination to determine whether the power supply voltage is greater than a predetermined value. The low voltage protection circuit forcibly cuts off the drive signal regardless of the logic of the main signal when the power supply voltage is lower than the predetermined voltage.

一般の低電圧保護回路では、電圧比較回路の後段に、信号を平滑化するフィルター回路を設けることが多い。このような低電圧保護回路は、ノイズによる短時間の電源電圧降下(電源電圧が所定の値以下となる時間が短い場合)であれば、駆動信号を遮断しない。   In general low voltage protection circuits, a filter circuit for smoothing a signal is often provided after the voltage comparison circuit. Such a low voltage protection circuit does not cut off the drive signal if the power supply voltage drop due to noise is short (when the time when the power supply voltage is equal to or lower than a predetermined value is short).

また、メイン信号がLの場合、ドライバー回路は駆動信号を出力しない。この場合にはUV判定は必要ないので、消費電力を削減するために低電圧保護回路への電源供給を遮断する技術が考案されている(例えば、特許文献1参照)   When the main signal is L, the driver circuit does not output a drive signal. In this case, since UV determination is not necessary, a technique for cutting off the power supply to the low voltage protection circuit has been devised in order to reduce power consumption (see, for example, Patent Document 1).

特開2003−279603号公報JP 2003-279603 A

特許文献1の電圧比較回路の後段にフィルター回路を設けた低電圧保護回路が考えられる。この従来の回路では、UV判定不要状態からUV判定必要状態に切り替わった時に、フィルター回路の起動時間を経過しなければ正しいUV判定を行うことができない。例えば、UV判定不要状態に電源電圧が低下していた場合、UV判定必要状態に切り替わると速やかにUV判定を行って、駆動信号を遮断する必要がある。しかし、従来の回路ではそのような正しい低電圧保護を行うことはできなかった。   A low voltage protection circuit in which a filter circuit is provided in the subsequent stage of the voltage comparison circuit of Patent Document 1 can be considered. In this conventional circuit, when switching from the UV determination unnecessary state to the UV determination necessary state, correct UV determination cannot be performed unless the activation time of the filter circuit has elapsed. For example, if the power supply voltage has been lowered to a UV determination unnecessary state, it is necessary to quickly perform UV determination and shut off the drive signal when the UV determination is required. However, the conventional circuit cannot perform such a correct low voltage protection.

本発明は、上述のような課題を解決するためになされたもので、その目的は消費電力を削減しつつ、正しい低電圧保護を行うことができる低電圧保護回路を得るものである。   The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a low-voltage protection circuit that can perform correct low-voltage protection while reducing power consumption.

本発明に係る低電圧保護回路は、電源の電圧を抵抗分割する抵抗分圧回路と、前記抵抗分圧回路の出力電圧と参考電圧を比較する電圧比較回路と、一端が接地された容量と、前記出力電圧が前記参考電圧より低い場合に前記容量を充電し、前記出力電圧が前記参考電圧より高い場合に前記容量を放電する充放電回路と、前記容量の前記他端の電圧を反転するインバータと、前記インバータの出力信号とメイン信号のAND演算を行うAND回路と、前記メイン信号がLの場合に、前記充放電回路への電源供給を停止する第1のスイッチと、前記メイン信号がLの場合に、前記容量を充電する第2のスイッチとを備えることを特徴とする。   A low voltage protection circuit according to the present invention includes a resistance voltage dividing circuit that divides a voltage of a power source by resistance, a voltage comparison circuit that compares an output voltage of the resistance voltage dividing circuit and a reference voltage, a capacitor having one end grounded, A charge / discharge circuit that charges the capacitor when the output voltage is lower than the reference voltage and discharges the capacitor when the output voltage is higher than the reference voltage, and an inverter that inverts the voltage at the other end of the capacitor An AND circuit that performs an AND operation on the output signal of the inverter and the main signal, a first switch that stops power supply to the charge / discharge circuit when the main signal is L, and the main signal is L In this case, a second switch for charging the capacitor is provided.

本発明により、消費電力を削減しつつ、正しい低電圧保護を行うことができる。   According to the present invention, correct low voltage protection can be performed while reducing power consumption.

本発明の実施の形態1に係る低電圧保護回路を示す図である。It is a figure which shows the low voltage protection circuit which concerns on Embodiment 1 of this invention. 比較例1に係る低電圧保護回路を示す図である。6 is a diagram illustrating a low voltage protection circuit according to a comparative example 1. FIG. 比較例2に係る低電圧保護回路を示す図である。It is a figure which shows the low voltage protection circuit which concerns on the comparative example 2. 実施の形態1と比較例2の回路の動作を示すタイミングチャートである。6 is a timing chart showing the operation of the circuit of Embodiment 1 and Comparative Example 2. 本発明の実施の形態2に係る低電圧保護回路を示す図である。It is a figure which shows the low voltage protection circuit which concerns on Embodiment 2 of this invention. 本発明の実施の形態3に係る低電圧保護回路を示す図である。It is a figure which shows the low voltage protection circuit which concerns on Embodiment 3 of this invention.

本発明の実施の形態に係る低電圧保護回路について図面を参照して説明する。同じ又は対応する構成要素には同じ符号を付し、説明の繰り返しを省略する場合がある。   A low voltage protection circuit according to an embodiment of the present invention will be described with reference to the drawings. The same or corresponding components are denoted by the same reference numerals, and repeated description may be omitted.

実施の形態1.
図1は、本発明の実施の形態1に係る低電圧保護回路を示す図である。電源と接地点の間に抵抗R1と抵抗R2が直列に接続されている。この抵抗R1,R2により抵抗分圧回路10が構成される。抵抗分圧回路10は、抵抗R1と抵抗R2の接続点の電圧を出力する。電圧比較回路CP1は、抵抗分圧回路10の出力電圧を+入力端子から入力し、参考電圧Vrefを−入力端子から入力して比較するオペアンプである。
Embodiment 1 FIG.
FIG. 1 is a diagram showing a low voltage protection circuit according to Embodiment 1 of the present invention. A resistor R1 and a resistor R2 are connected in series between the power source and the ground point. The resistors R1 and R2 constitute a resistor voltage dividing circuit 10. The resistance voltage dividing circuit 10 outputs a voltage at a connection point between the resistors R1 and R2. The voltage comparison circuit CP1 is an operational amplifier that inputs and compares the output voltage of the resistance voltage dividing circuit 10 from the + input terminal and the reference voltage Vref from the − input terminal.

電源と接地点の間に定電流回路I1とスイッチN1が直列に接続されている。スイッチN1はNチャネルMOSトランジスタである。スイッチN1は電圧比較回路CP1の出力信号により制御される。定電流回路I1とスイッチN1により充放電回路12が構成される。   A constant current circuit I1 and a switch N1 are connected in series between the power source and the grounding point. The switch N1 is an N channel MOS transistor. The switch N1 is controlled by the output signal of the voltage comparison circuit CP1. The charge / discharge circuit 12 is constituted by the constant current circuit I1 and the switch N1.

容量C1の一端が接地され、他端(A点)が定電流回路I1とスイッチN1の接続点に接続されている。インバータINV1のアノードが容量の他端に接続されている。AND回路14は、インバータINV1の出力信号とメイン信号を入力する。   One end of the capacitor C1 is grounded, and the other end (point A) is connected to a connection point between the constant current circuit I1 and the switch N1. The anode of the inverter INV1 is connected to the other end of the capacitor. The AND circuit 14 inputs the output signal of the inverter INV1 and the main signal.

電源と定電流回路I1の間にスイッチP1が接続され、電源と抵抗R1の間にスイッチP2が接続されている。電源と容量C1の他端の間にスイッチP3が接続されている。スイッチP1,P2,P3はPチャネルMOSトランジスタである。インバータINV2はメイン信号を反転させ、インバータINV3はインバータINV2の出力信号を反転させる。スイッチP1,P2は、インバータINV2の出力信号により制御される。スイッチP3は、インバータINV3の出力信号により制御される。   A switch P1 is connected between the power supply and the constant current circuit I1, and a switch P2 is connected between the power supply and the resistor R1. A switch P3 is connected between the power source and the other end of the capacitor C1. Switches P1, P2, and P3 are P-channel MOS transistors. The inverter INV2 inverts the main signal, and the inverter INV3 inverts the output signal of the inverter INV2. The switches P1 and P2 are controlled by the output signal of the inverter INV2. The switch P3 is controlled by the output signal of the inverter INV3.

続いて、本実施の形態に係る低電圧保護回路の動作を説明する。抵抗分圧回路10は、電源の電圧を抵抗分割する。電圧比較回路CP1は、抵抗分圧回路10の出力電圧と参考電圧Vrefを比較する。充放電回路12は、電圧比較回路CP1の比較結果を入力して、出力電圧が参考電圧より低い場合に容量C1を充電し、出力電圧が参考電圧Vrefより高い場合に容量C1を放電する。インバータINV1は、容量C1の他端の電圧を反転する。AND回路14は、インバータINV1の出力信号とメイン信号のAND演算を行う。   Next, the operation of the low voltage protection circuit according to this embodiment will be described. The resistance voltage dividing circuit 10 divides the voltage of the power supply by resistance. The voltage comparison circuit CP1 compares the output voltage of the resistance voltage dividing circuit 10 with the reference voltage Vref. The charge / discharge circuit 12 receives the comparison result of the voltage comparison circuit CP1, and charges the capacitor C1 when the output voltage is lower than the reference voltage, and discharges the capacitor C1 when the output voltage is higher than the reference voltage Vref. The inverter INV1 inverts the voltage at the other end of the capacitor C1. The AND circuit 14 performs an AND operation on the output signal of the inverter INV1 and the main signal.

スイッチP1は、メイン信号がLの場合に、充放電回路12への電源供給を停止する。スイッチP2は、メイン信号がLの場合に、抵抗分圧回路10への電源供給を停止する。スイッチP3は、メイン信号がLの場合に、容量C1を充電する。   The switch P1 stops power supply to the charge / discharge circuit 12 when the main signal is L. The switch P2 stops the power supply to the resistance voltage dividing circuit 10 when the main signal is L. The switch P3 charges the capacitor C1 when the main signal is L.

続いて、本実施の形態に係る低電圧保護回路の効果について比較例1,2と比較して説明する。図2は、比較例1に係る低電圧保護回路を示す図である。比較例1には、実施の形態1と比べてスイッチP1,P2、P3とインバータINV2,INV3が無い。従って、比較例1では、メイン信号の論理に関わらず常に回路が動作して電力を消費する。一方、本実施の形態では、メイン信号がLの場合にはUV判定が必要ないので、スイッチP1,P2により電源供給を遮断する。これにより、消費電力を削減することができる。   Next, the effect of the low voltage protection circuit according to the present embodiment will be described in comparison with Comparative Examples 1 and 2. FIG. 2 is a diagram illustrating a low voltage protection circuit according to the first comparative example. The comparative example 1 does not include the switches P1, P2, and P3 and the inverters INV2 and INV3 as compared with the first embodiment. Therefore, in Comparative Example 1, the circuit always operates and consumes power regardless of the logic of the main signal. On the other hand, in the present embodiment, when the main signal is L, UV determination is not necessary, and therefore power supply is shut off by the switches P1 and P2. Thereby, power consumption can be reduced.

図3は、比較例2に係る低電圧保護回路を示す図である。比較例2には、実施の形態1と比べてスイッチP3とインバータINV3が無い。従って、比較例2では、メイン信号がLの場合には容量C1は充電されない。   FIG. 3 is a diagram illustrating a low voltage protection circuit according to the second comparative example. The comparative example 2 does not have the switch P3 and the inverter INV3 as compared with the first embodiment. Therefore, in the comparative example 2, when the main signal is L, the capacitor C1 is not charged.

図4は、実施の形態1と比較例2の回路の動作を示すタイミングチャートである。電源電圧VBSが所定電圧VUVより大きい場合(VBS>VUV)、スイッチN1がONし、A点の電圧は0Vとなり、インバータINV1の出力信号はHとなる。従って、AND回路14の出力はメイン信号と同じ論理になる。ここで、VUV=(R1+R2)/R2×Vrefである。   FIG. 4 is a timing chart showing the operation of the circuits of the first embodiment and the comparative example 2. When the power supply voltage VBS is larger than the predetermined voltage VUV (VBS> VUV), the switch N1 is turned ON, the voltage at the point A becomes 0V, and the output signal of the inverter INV1 becomes H. Therefore, the output of the AND circuit 14 has the same logic as that of the main signal. Here, VUV = (R1 + R2) / R2 × Vref.

一方、VBSがVUVより小さい場合(VBS<VUV)、スイッチN1がOFFし、A点の電圧は高電圧となり、インバータINV1の出力信号はLとなる。従って、AND回路14の出力は、メイン信号の論理に関わらず強制的にLになる。   On the other hand, when VBS is smaller than VUV (VBS <VUV), the switch N1 is turned OFF, the voltage at the point A becomes a high voltage, and the output signal of the inverter INV1 becomes L. Therefore, the output of the AND circuit 14 is forced to be L regardless of the logic of the main signal.

また、定電流回路I1、スイッチN1,容量C1、及びインバータINV1によりフィルター回路が構成される。このフィルター回路により、電源電圧が通常電圧から低電圧に変化した場合に、その状態が一定時間経過した後にAND回路14の出力が強制的にLになる。これにより、ノイズによる短時間の電源電圧降下による論理制御を防ぐことができる。   The constant current circuit I1, the switch N1, the capacitor C1, and the inverter INV1 constitute a filter circuit. With this filter circuit, when the power supply voltage changes from a normal voltage to a low voltage, the output of the AND circuit 14 is forced to L after a certain period of time has passed. Thereby, logic control due to a short-time power supply voltage drop due to noise can be prevented.

しかし、比較例2では、メイン信号がLの場合にスイッチP1により定電流回路I1による容量C1の充電が行われない。従って、メイン信号がLからHに変わった場合に、A点の電圧が0Vから徐々に上昇する。このため、VBSがVUVより小さい場合でも、所定の起動時間の経過後にしか、AND回路14の出力がLにならない。なお、起動時間は、定電流I1の電流値、容量C1の容量値、インバータINV1の閾値により設定される。   However, in Comparative Example 2, when the main signal is L, the capacitor C1 is not charged by the constant current circuit I1 by the switch P1. Therefore, when the main signal changes from L to H, the voltage at the point A gradually increases from 0V. For this reason, even when VBS is smaller than VUV, the output of the AND circuit 14 becomes L only after a predetermined activation time has elapsed. The startup time is set by the current value of the constant current I1, the capacitance value of the capacitor C1, and the threshold value of the inverter INV1.

一方、本実施の形態では、メイン信号がLの場合に、スイッチP3により容量C1を充電する。従って、メイン信号がLからHに変わった場合に、A点の電圧は既に高電圧になっている。このため、VBSがVUVより小さい場合に、速やかにAND回路14の出力がLになる。よって、正しい低電圧保護を行うことができる。   On the other hand, in the present embodiment, when the main signal is L, the capacitor C1 is charged by the switch P3. Therefore, when the main signal changes from L to H, the voltage at the point A is already high. For this reason, when VBS is smaller than VUV, the output of the AND circuit 14 quickly becomes L. Therefore, correct low voltage protection can be performed.

実施の形態2.
図5は、本発明の実施の形態2に係る低電圧保護回路を示す図である。実施の形態1の構成に、容量C1の他端とスイッチN1の間に接続されたスイッチN2が追加されている。スイッチN2は、インバータINV3の出力信号により制御され、メイン信号がLの場合に容量C1の他端を接地点から切断する。これにより、スイッチP3がONした場合に電源から接地点に貫通電流Iaが流れるのを防ぐことができる。
Embodiment 2. FIG.
FIG. 5 is a diagram showing a low voltage protection circuit according to the second embodiment of the present invention. A switch N2 connected between the other end of the capacitor C1 and the switch N1 is added to the configuration of the first embodiment. The switch N2 is controlled by the output signal of the inverter INV3, and disconnects the other end of the capacitor C1 from the ground point when the main signal is L. Thereby, it is possible to prevent the through current Ia from flowing from the power source to the ground point when the switch P3 is turned on.

実施の形態3.
図6は、本発明の実施の形態3に係る低電圧保護回路を示す図である。実施の形態2の構成に比べて、スイッチP2の代わりに、抵抗R2と接地点の間に接続されたスイッチN3が設けられている。スイッチN3は、インバータINV3の出力信号により制御され、メイン信号がLの場合に抵抗分圧回路10を接地点から切断する。これにより、スイッチP2と同様に抵抗分圧回路10の消費電力を削減することができる。
Embodiment 3 FIG.
FIG. 6 is a diagram showing a low voltage protection circuit according to Embodiment 3 of the present invention. Compared to the configuration of the second embodiment, a switch N3 connected between the resistor R2 and the ground point is provided instead of the switch P2. The switch N3 is controlled by the output signal of the inverter INV3. When the main signal is L, the switch N3 is disconnected from the ground point. Thereby, the power consumption of the resistance voltage dividing circuit 10 can be reduced similarly to the switch P2.

10 抵抗分圧回路
12 充放電回路
14 AND回路
C1 容量
CP1 電圧比較回路
INV1 インバータ
N2 スイッチ(第4のスイッチ)
N3 スイッチ(第5のスイッチ)
P1 スイッチ(第1のスイッチ)
P3 スイッチ(第2のスイッチ)
P2 スイッチ(第3のスイッチ)
10 resistor voltage dividing circuit 12 charge / discharge circuit 14 AND circuit C1 capacitance CP1 voltage comparison circuit INV1 inverter N2 switch (fourth switch)
N3 switch (fifth switch)
P1 switch (first switch)
P3 switch (second switch)
P2 switch (third switch)

Claims (4)

電源の電圧を抵抗分割する抵抗分圧回路と、
前記抵抗分圧回路の出力電圧と参考電圧を比較する電圧比較回路と、
一端が接地された容量と、
前記出力電圧が前記参考電圧より低い場合に前記容量を充電し、前記出力電圧が前記参考電圧より高い場合に前記容量を放電する充放電回路と、
前記容量の前記他端の電圧を反転するインバータと、
前記インバータの出力信号とメイン信号のAND演算を行うAND回路と、
前記メイン信号がLの場合に、前記充放電回路への電源供給を停止する第1のスイッチと、
前記メイン信号がLの場合に、前記容量を充電する第2のスイッチとを備えることを特徴とする低電圧保護回路。
A resistance voltage dividing circuit for dividing the voltage of the power supply by resistance;
A voltage comparison circuit that compares the output voltage of the resistance voltage divider circuit with a reference voltage;
A capacitor with one end grounded;
A charge / discharge circuit that charges the capacitor when the output voltage is lower than the reference voltage, and discharges the capacitor when the output voltage is higher than the reference voltage;
An inverter for inverting the voltage at the other end of the capacitor;
An AND circuit that performs an AND operation on the output signal of the inverter and the main signal;
A first switch for stopping power supply to the charge / discharge circuit when the main signal is L;
A low voltage protection circuit comprising: a second switch that charges the capacitor when the main signal is L.
前記メイン信号がLの場合に、前記抵抗分圧回路への電源供給を停止する第3のスイッチを更に備えることを特徴とする請求項1に記載の低電圧保護回路。   The low-voltage protection circuit according to claim 1, further comprising a third switch that stops power supply to the resistance voltage dividing circuit when the main signal is L. 前記メイン信号がLの場合に、前記容量の前記他端を接地点から切断する第4のスイッチを更に備えることを特徴とする請求項1又は2に記載の低電圧保護回路。   3. The low-voltage protection circuit according to claim 1, further comprising a fourth switch that disconnects the other end of the capacitor from a ground point when the main signal is L. 4. 前記メイン信号がLの場合に、前記抵抗分圧回路を接地点から切断する第5のスイッチを更に備えることを特徴とする請求項1〜3の何れか1項に記載の低電圧保護回路。   The low-voltage protection circuit according to claim 1, further comprising a fifth switch that disconnects the resistance voltage dividing circuit from a ground point when the main signal is L. 5.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103499730A (en) * 2013-10-16 2014-01-08 国网山东省电力公司青岛供电公司 Safety electricity testing and discharging device
CN109188306A (en) * 2018-07-18 2019-01-11 深圳市华星光电半导体显示技术有限公司 Detect the circuit and method of the input voltage rate of climb

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JPH06337276A (en) * 1993-04-02 1994-12-06 Seiko Instr Inc Electric signal delay circuit
JPH1173253A (en) * 1997-08-29 1999-03-16 Sanyo Electric Co Ltd Low voltage detecting circuit
JP2003279603A (en) * 2002-03-25 2003-10-02 Citizen Watch Co Ltd Power-supply voltage detection circuit

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
JPH06337276A (en) * 1993-04-02 1994-12-06 Seiko Instr Inc Electric signal delay circuit
JPH1173253A (en) * 1997-08-29 1999-03-16 Sanyo Electric Co Ltd Low voltage detecting circuit
JP2003279603A (en) * 2002-03-25 2003-10-02 Citizen Watch Co Ltd Power-supply voltage detection circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103499730A (en) * 2013-10-16 2014-01-08 国网山东省电力公司青岛供电公司 Safety electricity testing and discharging device
CN109188306A (en) * 2018-07-18 2019-01-11 深圳市华星光电半导体显示技术有限公司 Detect the circuit and method of the input voltage rate of climb

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