摘要:
A supply current is supplied to an error detection circuit for detecting an error condition of an IC of the power supply circuit such as an overheat detection circuit only when the detection current of the power transistor of the power supply circuit is higher than a reference. Moreover, a supply current to the constant current source is supplied only when the detection current of the power transistor is higher than the reference to suppress the power consumption. Thus, suppression of the power consumption in the battery backup operation for a RAM during ignition off condition is provided. The current detection of the power transistor of the power supply circuit is detected with a series resistor or a multi-collector transistor.
摘要:
A method and apparatus provide for improved crowbar protection in a shunt regulator circuit including a shunt device. An over-temperature protection circuit may be combined with a fast-crowbar protection circuit such that maximum protection from damaging thermal energy is provided to a shunt device. The fast-crowbar protection circuit estimates the thermal energy in the shunt device based upon an integration method. By integrating a measured power over time the rise in temperature can be estimated such that the crowbar protection is enabled before the thermal energy can damage the shunt device. The integration method can be approximated using a piece-wise linear approximation such that the estimation circuitry can be simplified. A series of comparators and timing/delay circuits are employed to measure a current level in the shunt device over a given duration. The timing/delay circuits have memory such that heat build up and heat dissipation are modeled.
摘要:
The semiconductor component has a circuit configuration for driving an electrical load. The circuit includes a control circuit with a power switch driven by a drive configuration and feeding a current to the load. The semiconductor component has a first temperature detector thermally closely coupled to the power switch and a further temperature detector. A temperature evaluation circuit receives temperature signal from the temperature detectors and generates a signal that depends on the signals of the temperature detectors and feeds the signal to the drive configuration.
摘要:
A method for protection of an electrical installation against series fault. The method is directed to detection of heat development at specific points in the installation by means of individual sensor/switch units connected to the installation and interruption of the current supply to the installation when the heat development exceeds a given threshold. The invention also concerns a system for implementing the method.
摘要:
A control system includes a rectifier bridge including a heat sink having a temperature, and also including an SCR having a gate. The SCR thermally engages the heat sink. A circuit controls the rectifier bridge through the gate of the SCR. An RTD circuit measures the temperature of the heat sink. A circuit disables gating of the SC based upon the temperature of the heat sink.
摘要:
An electronic control device has a power switch for driving and supplying an electrical drive for a fitting which is to be controlled. The invention provides for the power switch to be driven by an electronic computer assembly arranged inside the housing of the control device and which can be supplied with parameterization data for driving the electrical drive for the fitting.
摘要:
A system for motor thermal protector device performance test data collection includes a microprocessor configured to measure elapsed times of reset and trip power cycles of a motor winding through a thermal protector device. An operator interface terminal is coupled to the microprocessor and includes a display and input selectors for recalling a predetermined number of elapsed reset and trip times stored in a system memory.
摘要:
A fuseless DC-DC converter is provided to protect a circuit from overcurrent without involvement of a protective fuse. This is accomplished by providing a load circuit in the converter that includes a first overheat self-interruption-type semiconductor switch in series between a DC power supply and a load, and a reference circuit including a second overheat self-interruption-type semiconductor switch in parrallel with the first switch, and a reference resistor with one end connected to the source of the second switch, and the other end grounded. Also included is a comparator circuit that compares the source voltage of the first switch with a reference voltage applied to the source of the second switch, and thereby determines if the circuit has overcurrent. If overcurrent is detected, the results from the comparator circuit are used by a power supply controller to deactivate the semiconductor switch.
摘要:
A fuse/support assembly for attachment to an electrical bus includes a base plate having a substrate made of an insulator, a fastener bore extending through the substrate, and an electrically conductive path on the substrate. There is additionally an external connector structure. A fuse is supported on the substrate and has a first end in electrical communication with the external connector and a second end in electrical communication with the electrically conductive path.
摘要:
A method of controlling a variable speed draft inducer motor and fan in a gas furnace. The method comprises the steps of: detecting a first fault driving the motor to a maximum operating range; detecting a second fault forcing the motor to operate towards a minimum operating range; and generating a fault signal if both faults are detected substantially simultaneously.