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JPH1079472A |
To obtain a single pellet semiconductor integrated circuit which is never broken, even if the reverse polarity of a DC power source is connected. A semiconductor integrated circuit is a bipolar IC having elements to which an external DC ...
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JPH1065945A |
To stop the supply of power before an electric device is damaged or is defective in itself in the case of supplying power even when a cable for power supply is mis-connected or the like. A microcomputer 8 is started when receiving a curr...
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JPH1042465A |
To prevent malfunction of a circuit and life deterioration of an electronic apparatus, by obtaining always a constant polarity voltage when the polarity of a battery is changed, by installing four transfer gates wherein a positive voltag...
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JP2708756B2 |
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JP2560436Y2 |
A motor drive circuit comprises a motor, a DC source connected to said motor, first and second switching elements turned on and off to control a current flowing to the motor having one terminal connected to a common connecting point of t...
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JPH09322398A |
To improve safety by stopping the voltage output state to a contact- type contact point for electrically connecting the main body of the device and a unit quickly and securely by opening safety switches. A DC power supply 43 is connected...
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JP2685438B2 |
A method for error-protected switching operation of switching devices of a high-voltage switching station. The current operational state of the station is determined from the signals provided by position indicating contacts (KI, KII, KII...
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JPH09308095A |
To warn the reverse connection of a car battery, by sounding the horn utilizing a power MOS-FET and its parasitic diode. The source S and drain D of a power MOS-FET 11 and a horn driving circuit 4 are placed in series between the positiv...
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JPH09308096A |
To prevent diversion to electric apparatuses used in applications other than primary ones by prohibiting power supply to an electric apparatus and warning an user of incompetence if an electric apparatus discriminating means discriminate...
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JP2553827Y2 |
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JPH09285598A |
To provide an overvoltage protective device in which direct application of an AC of 100V on a game machine such as a Japenese pinball game machine (Pachinko) by mistake can be avoided to prevent breakage, which can be composed compact to...
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JPH09285002A |
To cut off the supply of a power supply voltage to a main power supply transformer when a voltage applied to an electric machine is not the same as a normally operating power supply voltage value by a method wherein the connections betwe...
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JPH09285001A |
To provide a small portable information device which is capable of protecting circuit components from failure caused by breakdown voltage even if a battery not specified is used, and also capable of prompting a user to replace the batter...
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JPH09285004A |
To block a reverse current from ground to the common grounding terminal of an apparatus or equipment and to prevent the failure of or damage to the apparatus or equipment caused by the reverse current. A voltage detecting part 10 detects...
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JPH09285003A |
To make it unnecessary to take the reverse connection of a battery into consideration by a method wherein, when various electrical components are connected to a battery, currents of normal polarities are made to flow to the respective el...
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JP2669014B2 |
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JPH09266627A |
To surely prevent an electric shock accident by cutting off the supply of commercial power and preventing the occurrence of leakage in case that the earth condition of a washing machine is not good. In case that the power switches 40 and...
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JP2549130Y2 |
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JP2653016B2 |
PURPOSE: To provide a DC power supply protective circuit which is connected between a DC power source and a load to protect the DC power supply by detecting short-circuit of the load and protecting the short-circuit of the DC power sourc...
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JPH09236362A |
To prevent the operation of a motor simultaneously with other instruments, necessitating much electric power upon starting, by a method wherein the signal of a signal retaining circuit, outputting an operating signal upon generating serv...
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JPH09224368A |
To protect one of two series-connected capacitors when the other capacitor is short-circuited by a method wherein the light emission of the light emitting device of a photocoupler corresponding to the short-circuited capacitor is discont...
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JPH09200942A |
To provide a controller which protects a neutral point resistor, etc., by breaking a current immediately in case that a large current flows in an earth transformer and continues to flow to the neutral point resistor, and enables easy rep...
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JPH09200951A |
To prevent the generation of trouble such as a heat generation accident with an overcurrent when a power-supply side terminal and a ground-side terminal are short-circuited from the outside by detecting whether or not the power-supply si...
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JPH09163597A |
To prevent the damage of load caused by the application of overvoltage. A voltage detecting circuit 5 is connected on the main battery side 3 from a main relay 4 so that the voltage of the main battery 3 may be detected even if the main ...
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JPH09163596A |
To protect a monitor mechanism, which is installed to receive image or sound from monitor equipment, or control the monitor, etc., from the surge of thunderbolt. A monitor system is made of a monitor mechanism B comprising monitor equipm...
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JP2537992Y2 |
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JPH09129383A |
To provide a circuit device for operating an electric discharge lamp. This device comprises input terminals K1, K2 for the connection to a power supply; rectifiers D1-D4 connected to the terminals K1, K2 for rectifying the voltage suppli...
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JP2607372B2 |
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JP2607997B2 |
PURPOSE: To reduce the size and weight of inverters and output transformers by providing a connection switching device which discriminates the high voltage and the low voltage approx. half of which of an AC power source and connects smoo...
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JPH09121455A |
To protect a load from overvoltage even if a battery is removed by a method wherein, when the battery is not connected to first and second connection terminals, the first connection terminal is connected to the other electrode of a solar...
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JPH0993805A |
To prevent secondary disasters when power is restored after a disaster, such as earthquake. A disaster preventive circuit breaker 10 consists of a buzzer 1, a lamp 2, a reset switch 3 and a two-pole relay switch 5 opened/closed by means ...
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JPH0993941A |
To provide a circuit breakdown preventive function against a high voltage input with a simple construction in a power supply circuit which is composed of a power supply transformer, a rectifier and a smoothing capacitor. An AC power supp...
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JPH0993804A |
To constitute a system device that connects a power supply and a plasma display through a junction cable so that, if the junction cable is disconnected, high-voltage power supply will be interrupted to eliminate the danger of electric sh...
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JPH0970134A |
To facilitate the protection on a customer receiving equipment side eve if an intermittent ground fault with a long failure rest time by a method wherein, if a period during which a system failure is not detected continuous longer than a...
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JP2585111B2 |
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JPH0951631A |
To enhance the safety by invalidating the emergency reset when a solenoid valve drive switch is not closed. A current detection circuit 14 detects the state where all solenoid drive switches Q1-Q3 are closed under emergency reset through...
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JP2525450Y2 |
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JPH0937562A |
To surely discharge the electric charge of a smoothing capacitor of an inverter device at the tame of maintenance. An inverter device has a converter section 1 to convert AC to DC, a smoothing capacitor 3, an inverter section 2 to revers...
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JP2574894B2 |
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JP2523121Y2 |
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JPH08289466A |
PURPOSE: To protect an electric machine connected with a power supply against damage or failure by determining the phase difference between first and second pulses having different pulse width, deciding whether the phase difference comes...
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JPH08289457A |
PURPOSE: To interrupt and protect a power receiving circuit upon occurrence of natural disaster, while preventing the secondary disaster such as fire, by interrupting power supply to a load circuit when the circuit voltage is lower than ...
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JPH08275385A |
PURPOSE: To prevent the malfunction by arranging the constitution such that excessive AC voltage is not applied to a signal input circuit even if a signal input terminal is erroneously connected to one side of power source terminal. CONS...
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JPH08251806A |
PURPOSE: To obtain a protective circuit in which the number of fuses or the like can be reduced without spoiling a protective function in the case of a short circuit by a method wherein a fuse or a fusing resistance is inserted into a co...
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JPH08237886A |
PURPOSE: To provide a highly reliable and economical uninterruptible power supply system wherein damage to a d.c. power supply, an output circuit and/or a load circuit and failure of a load by erroneous connection between the output circ...
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JPH08214100A |
PURPOSE: To discriminate whether an auxiliary battery is rightly set or not by detecting the voltage of the auxiliary battery set to a facsimile equipment by an A/D converter. CONSTITUTION: When an auxiliary battery 13 is rightly set to ...
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JPH08182188A |
To attain high resistance against inconvenient load dump by inserting a first diode polarized forward into a a line connected with the positive pole of a voltage supply and arranging a second diode which is reverse polarized for connecti...
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JP2503526Y2 |
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JPH08163776A |
PURPOSE: To prevent unexpected troubles from occurring due to bad grounding by monitoring the grounding condition of an electric apparatus at all times and automatically stopping supply of power to the electric apparatus when a bad groun...
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JP2505058B2 |
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