| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 181 | Safety device for electric consumers in motor vehicles | US166925 | 1980-07-08 | US4371910A | 1983-02-01 | Carsten Bube; Ernst H. Dull; Gerd Thiele; Hans Zeller |
| Safety apparatus for a motor vehicle electric consumer having a temperature-dependent internal resistance, which includes a temperature indicating circuit for providing a signal which accurately indicates the consumer temperature to a threshold switch which actuates a switching device to interrupt current flow through the consumer whenever the consumer temperature exceeds a predetermined maximum value. The temperature indicating circuit either may be a consumer resistance measuring circuit such as a bridge circuit including the consumer in one leg thereof, or may be a consumer temperature replicating circuit, connected in parallel with the consumer, such as a special RC network. The switching device either may be a switch connected in series with the consumer, or a switch connected in parallel with the consumer, in which case the apparatus also includes an overcurrent device connected in series with the parallel combination of the switch and the consumer. | ||||||
| 182 | Thermal protection circuit for the die of a transistor | US108585 | 1979-12-31 | US4330809A | 1982-05-18 | Gerald R. Stanley |
| A thermal protection circuit for the die of a transistor having a heat sink in which a signal proportional to the dissipative input current and a signal proportional to the dissipative applied voltage of the transistor are multiplied to produce a signal representative of the applied power to the transistor. This representative applied power signal is transformed into a simulated differential in temperature between the die of the transistor and its heat sink. Simultaneously, the temperature of the heat sink is determined and this temperature is added to the simulated differential in temperature between the die of the transistor and the heat sink to determine a sensed die temperature. A control responsive to this sensed die temperature reduces the applied power to the transistor. | ||||||
| 183 | Solid state valve thermal protection for HVDC power converters | US781279 | 1977-03-25 | US4117527A | 1978-09-26 | Donald Monroe Demarest; Edgar Frank Chandler |
| A thermal protection system is provided for a solid state valve that includes at least one representative thyristor having a junction and a heat sink system. The protection system comprises a thermal analog model whose electrical network dynamic electrical operating characteristics are electrically analogous to the thermal characteristics of the solid state valve for any given value of instantaneous load current supplied through the valve, which thermal characteristics include the heat transfer to cooling fluid capability characteristics of said representative thyristor including its heat sink system. A first electrical signal is derived which is representative of the value of the D.C. load current through said valve. A D.C. current to watts generation simulation network responsive to the first electric signal is provided for deriving an output electrical signal representative of the instantaneous value of the watts being dissipated within the junction of said representative thyristor for a given value of load current flowing through said junction. The watts-being-generated signal is applied to said thermal analog model and an output electric signal is derived from said thermal analog model which is representative of the temperature of said thyristor junction.The thermal analog model comprises an RC ladder network having the signal from the simulation network applied to one of its terminals. To another terminal of the ladder network is applied an electric signal representative of the instantaneous temperature value of the cooling fluid flowing over said solid state valve means and said heat sink system. | ||||||
| 184 | Temperature monitoring of semiconductors | US645323 | 1975-12-30 | US4001649A | 1977-01-04 | John A. I. Young |
| A current sensor provides a voltage signal which is proportional to the average current flowing through a semiconductor device junction. This voltage signal is applied to a first analogue circuit which produces an output voltage indicative of the average power dissipated at the junction. The output of the first analogue circuit is applied to a second analogue circuit which outputs a voltage signal indicative of the temperature difference between the junction and a heat sink associated with the semiconductor device and to a third analogue circuit which outputs a voltage signal indicative of the temperature difference between the heat sink and ambient. The ambient temperature is sensed by an ambient temperature sensor which outputs a voltage signal indicative of the ambient temperature. A voltage summing circuit sums the output voltages from the second and third analogue circuits and from the ambient temperature sensor, and produces an output voltage indicative of the junction temperature. | ||||||
| 185 | Sample and hold-circuit arrangement for an electrical motor simulator of an electronic motor protection relay | US618211 | 1975-09-30 | US3996480A | 1976-12-07 | Michael Hentschel |
| A sample and hold-circuit arrangement for an electrical motor simulator of an electronic motor protection relay wherein the motor simulator is charged by a charging current source with clocked charging currents through a main or primary switch controlled by clock signals. A sample and hold-amplifier containing a storage capacitor and an electronic switching device are connected through the main switch at the motor simulator and the electronic switching device is controlled by the clock signals. The sample and hold-amplifier containing the storage capacitor is electrically connected during the charging cycles to the motor simulator for recharging of the storage capacitor to the charging voltage of the motor simulator and during the rest cycles is electrically disconnected from the motor simulator for the control or triggering of the sample and hold-amplifier by the charging voltage of the recharged storage capacitor. | ||||||
| 186 | Overload protection and display circuit, particularly for sound radiators | US459684 | 1974-04-10 | US3943411A | 1976-03-09 | Denes Huszty; Emil Sesztak |
| Subject-matter of the invention is an overload protection and display circuit, in particular for operation in conjunction with high-power sound radiators, and including one or more protective circuits therein. Each circuit senses the real value of the electrical sign applied to their inputs. The moment of interference depends on the averaged real output of an adequately long memory period preceding the interference. Consequently the sound radiators may be operated controlled by an output considerably in excess of the usual.Improved results are achieved by connecting an indirectly heated thermistor in series with the winding of an interfering relay, and using a Zener diode connected for operation in the reverse direction, while the filament windings of the indirectly heated thermistor are terminated on the input points of the protective circuit through a resistance. | ||||||
| 187 | Solid state thermal overload indicator | US36204773 | 1973-05-21 | US3845354A | 1974-10-29 | BOOTHMAN D; NUTT D |
| A solid state overload indicator of the inverse-operating characteristic type which is more mindful of the electrical thermal characteristics of the load as it is heated. According to the embodiment disclosed for a motor load and having an independently adjustable stall operating time and running overload trip level, the indicator has analog means, for the thermal resistance and capacitance of the copper in the motor for accounting for the heat energy stored in the motor, connected between one DC bus, and a conductor. Voltage-sensitive indicating means is connected to the conductor for producing an indication for a particular voltage thereon, corresponding to the minimum excessive load temperature. First and second voltage-dependent current valves are each connected between the conductor and the other bus and to current-to-voltage transducers connected in the lines to the motor whereby the voltage on the conductor is a function of the motor current subject to the capacitance and equal to the particular voltage for each value of current after a time according to the indicator characteristic has elapsed. The first and second current valves are adjustable for presetting the trip level and the stall time respectively; the second current valve is on only for overloads greater than some value of overload between the stall and running overloads so that the two can be present independently of each other.
|
||||||
| 188 | Heating indicating device of an electric motor | US33849173 | 1973-03-06 | US3809960A | 1974-05-07 | JOSSIC A |
| Heating indicating device for the rotor of an electric motor notably using direct current. According to the invention, this device is characterized in that it comprises a resistor mounted in series with said rotor, means reading the voltage across said resistor and supplying an output voltage corresponding to the square of the input voltage, means simulating the thermal exchange time constant between said rotor and its environment and causing progression, in time, of said output voltage in accordance with said time constant, means for emitting a reference voltage representative of the maximum allowable temperature that must not be exceeded for the rotor and means for comparing this reference voltage and the output voltage of the means simulating the time constant. Supervision of motor, notably in printing machines.
|
||||||
| 189 | Protective circuit for electric motors | US3753070D | 1971-12-06 | US3753070A | 1973-08-14 | BUNGER F; LEHMANN K |
| The protective circuit is used in a switching arrangement for protecting an electric motor against thermal overload, and of the type including a heating resistor in the motor supply circuit, a temperature sensing resistor, having a highly temperaturedependent resistance characteristic, in heat transfer contact with the heating resistor and a motor cut-off control means connected to the temperature sensitive resistor to provide a signal voltage for disconnecting the motor from its source of potential upon thermal overloading of the motor. The heating resistor has a thermal behavior simulating the thermal behavior of the motor to be protected. A bias voltage is applied to the input of an amplifier of the cut-off control means, and this bias voltage can be set on a potentiometer and is influenced by an additional temperature-dependent resistor to compensate the room temperature at the location of the switching arrangement. The arrangement may be used with either a direct current motor supply, a single phase AC motor supply, or a polyphase AC motor supply.
|
||||||
| 190 | Thermal protection device for linear motor | US3735219D | 1971-08-25 | US3735219A | 1973-05-22 | KAHN M; KRAJEWSKI W; JOHNSON T |
| Thermal protection apparatus is disclosed for electrical motors and, in particular, for a linear motor as, for example, the type used in magnetic disc recording drive systems. An electrical circuit, the analog of the thermal characteristics of the armature coil, provides electrical signals indicative of the temperature of the armature coil. Safety or protection means responsive to these electrical signals maintains the motor armature coil below a safe, predetermined level, by, in the preferred embodiment, reducing the average power input to the motor.
|
||||||
| 191 | Apparatus for protecting electrical devices | US3693047D | 1971-09-28 | US3693047A | 1972-09-19 | HAMSTRA DAVID C |
| Apparatus for protecting electrical devices, particularly permanent magnet motors and components for controlling the speed of such motors, such as solid state elements, against excessive current and excessive temperature. A permanent magnet motor utilized for driving an electric appliance, such as a blender, is controlled by a circuit which includes a silicon-controlled rectifier in series with the motor. The SCR is mounted in heat transfer relationship with one side of a heat sink composed of a material having good heat conductivity. A thermally-actuated switch, connected in series circuit with the motor and the SCR, is positioned in heat transfer relationship with the opposite side of the heat sink. The heat sink is constructed so that its thermal mass may be easily modified to make the temperature of the heat sink correspond generally to the temperature of the motor, at least in the range of temperatures where protection is to be provided. The thermally-actuated switch is responsive to the heat sink temperature to protect the electrical devices against excessive temperature of the motor or of the SCR, and also is responsive to current through the resistance of the switch to protect against excessive current surge.
|
||||||
| 192 | Thermal analogue protection for capacitors | US3562586D | 1968-11-15 | US3562586A | 1971-02-09 | CARTER WILLIAM A; JENSEN OTTO |
| A capacitor protection system is provided having the primary winding of a potential transformer connected across a series capacitor bank to be protected and the secondary winding of the potential transformer connected to a thermal analogue device which reproduces the thermal characteristics of the capacitor and operates capacitor switching means when dangerous thermal conditions are reached. An inverse time voltage relay is also connected across the secondary winding to initiate protective capacitor switching responsive to high current faults. The thermal analogue device simulates the internal thermal conditions of the capacitor based on the principle that the power loss in the capacitor is proportional to the square of the voltage across the capacitor. Voltage comparison circuits are also provided between groups of capacitors in banks having multiple groups to detect blown fuses associated with respective capacitor groups.
|
||||||
| 193 | Overload protection replica relay device | US3538381D | 1967-09-25 | US3538381A | 1970-11-03 | CUTTINO WILLIAM H; SANTILLI JAMES N |
| 194 | Electrothermal integrator | US3502944D | 1967-08-28 | US3502944A | 1970-03-24 | SQUIERS DAVID J |
| 195 | Overload control for silicon diodes in resistance welders and the like | US3484651D | 1966-10-06 | US3484651A | 1969-12-16 | RILEY JOSEPH J |
| 196 | Static overcurrent relay | US24846363 | 1963-01-04 | US3300685A | 1967-01-24 | ZOCHOLL STANLEY E |
| 197 | Supervisory system for temperatures of electric cables | US34865264 | 1964-03-02 | US3289478A | 1966-12-06 | SHINICHI TOKUNAGA; TOSHIO KASAHARA |
| 198 | Electrical temperature reproducer | US28423363 | 1963-05-29 | US3148349A | 1964-09-08 | ROSE MERRILL W; KUHN EDMUND W |
| 199 | Overheat electrical protection device | US55815656 | 1956-01-09 | US3019372A | 1962-01-30 | MELVILLE PEARCE FREDERICK; WILSON HODGKISS JAMES |
| 200 | Testing arrangement for protected electrical apparatus | US52366444 | 1944-02-24 | US2474825A | 1949-07-05 | GUGLIELMO CAMILLI |
QQ群二维码
意见反馈
意见反馈