摘要:
A thyristor switch (1) is constituted of a pair of arms connected in anti-parallel, each of the arms including a plurality of thyristors connected in series. A controller (4) includes a phase detecting unit (10) configured to detect a phase of a power supply voltage supplied from an alternating-current power supply (2), and a gate signal generating unit (20) configured to interrupt a gate signal when an open command is provided to the static switch and the phase of the power supply voltage detected by the phase detecting unit (10) matches a target phase. The target phase is set outside of a phase range where interruption of the gate signal is prohibited, the phase range being set so as to include a zero crossing point at which a load current is switched in polarity.
摘要:
A power supply control system is proposed for controlling the supply of power from an alternating current (AC) power source to a load. A triac (T1) in series with the load is controlled by a controller (11), typically an MCU, coupled to the gate terminal of the triac via a rectifier unit comprising at least one rectifier (B1). The rectifier unit transmits a control signal from the controller to the triac, and additionally generates a power signal for powering the controller. Thus, advantageously, a common path can be used for triggering the triac, and powering the controller, so that no sophisticated power supply is required for the controller. This both reduces cost and increase reliability. A capacitive network (ZL, ZH) is provided in parallel with the triac, and electrically connected to an input of the rectifier unit. Optionally, the triac may be additionally triggered in the case of a power surge superimposed on the AC power source, to divert the power surge away from vulnerable components.
摘要:
Light-dimming device (10) includes: first and second terminals (1, 2); switch (3) including switching device (7) connected between terminals (1, 2); adjuster (6) for varying conduction angle of switch (3); controller (4) for controlling switch (3) and power supply module (5) for supplying power to controller (4). Controller (4) includes zero-cross detection circuit (9) for detecting zero-cross of AC voltage (Va), control circuit (11) for generating PWM signal of on-duty ratio corresponding to conduction angle from adjuster (6), and driver circuit (8) for turning device (7) on and off by PWM signal. Controller (4) allows device (7) to conduct and then turn off within variable period of time, from start of half cycle of AC voltage, shorter than half cycle. Circuit 11 starts generation of pulse in PWM signal when prescribed period of time, shorter than variable period of time, from zero-cross of voltage Va elapses.
摘要:
A static transfer switch is used for switching an output load from a first power source to a second power source. A first switching unit has a first pair of silicon controlled rectifiers (SCR). A second switching unit has a second pair of SCRs arranged in an anti-parallel configuration. The control circuit determines whether at least one of the SCRs is activated in accordance with the voltage between the gate and the cathode of the at least one SCR. If the voltage between the gate in the cathode is at least 150 mV, the control circuit indicates that the at least one of the SCR is activated.
摘要:
A direct current (DC) circuit breaker (100) for power transmission or distribution system includes a current sensor (CS) for sensing current of a system, a controller (140), a physical switch (K), and multiple switch modules (12). The multiple switch modules (12) are electrically coupled to the current sensor (CS) and the physical switch (K) in series. Each switch module (12) includes multiple base elements electrically coupled in parallel. Each base element includes a first silicon carbide (SiC) metal-oxide-semiconductor field-effect transistor (MOSFET) and a second SiC MOSFET electrically coupled in an opposite series connection mode. The first and second SiC MOSFETs are configured in a synchronous rectification mode by channel reverse conduction control. The controller (140) controls the multiple switch modules (12) to connect current in the system, and break current of the multiple switch modules according to sensed current signals from the current sensor (CS).
摘要:
A solid state relay includes a light-receiving element, output terminals configured to connect to an AC power supply and a load, a first connection line connecting a first end of the light-receiving element to a first output terminal, a second connection line that connects a second end of the light-receiving element to a second output terminal, a switching element between the first connection line and the second connection and configured to be turned on by the current outputted from the light-receiving element, and a snubber circuit in which a capacitor and a resistor are connected in series. The resistor of the snubber circuit connects to the first connection line between one of the first and second end of the light-receiving element and an end of the switching element, and an over-current protection element connects to the first connection line between the resistor and an end of the switching element.
摘要:
L'invention concerne un procédé et un circuit de détection d'une surchauffe d'un commutateur électronique d'alimentation d'une charge par une tension alternative, dans lesquels une tension représentative de la température au voisinage du commutateur est comparée (41) par rapport à un seuil, le résultat de cette comparaison étant échantillonné (51) à une fréquence correspondant à un multiple pair de la fréquence de la tension alternative d'alimentation, pour fournir un signal (OVT) indicateur d'un dépassement d'un seuil de température.
摘要:
L'invention concerne un commutateur bidirectionnel haute tension (20), comportant un élément (K) de commutation bidirectionnel haute tension, et des moyens (21) pour rendre l'élément de commutation bistable et commandable par au plus deux signaux impulsionnels (V ON/OFF ) basse tension.
摘要翻译:双向高压开关(20)包括用于切换串联连接到负载(2)的高AC电压(Vac)的元件(K)。 存在用于使开关元件双稳态并且由至多两个脉冲信号(V on / V off)可控的控制电路(21)。 电路(21)包含两个断路器,它们是三端双向可控硅开关或晶闸管。 第一断续器与电容器串联连接,并且在接收高AC电压(Vac)的端子(8,9)之间的第一电阻器连接。 220V。第二断路器与第二电阻器串联连接,该串联连接与电容器和第一断路器的串联连接。 脉冲信号的频率与50Hz的高交流电压的频率不同,脉冲长度也与周期不同。 电容器的尺寸被设计为在高交流电压的每个改变时存储足够的能量用于重启开关元件(K)。 第一中断通过其闭合开关元件(K)而连接成关闭,并且第二断续器通过关闭开关元件(K)连接以关闭。 第二个断路器通过闭合将电容器放电,以防止开关元件(K)的自动重启。 在第一实施例中,双向开关具有用于脉冲信号的两个输入(V on / V off),在第二实施例中,两个断续器由唯一的脉冲信号(V on / off)控制。 每个断路器是单向的,对应于给定的导电方向。 独特的控制信号(V on / off)与高交流电压同步。 在第一次交替期间出现的脉冲闭合双向开关(20),而第二次交替期间的脉冲打开开关。