摘要:
Disclosed a high pressure discharge lamp driving apparatus for driving a high pressure discharge lamp during a stable operation thereof with an AC lamp current alternating for opposite half-cycle periods, the apparatus comprising an AC lamp current supply for supplying the AC lamp current to the high pressure discharge lamp, a detector for detecting the output AC lamp current to the high pressure discharge lamp, a controller responsive to the detector for controlling the AC supply to output the AC lamp current with a waveform which is characterized by that (i) a mean value in the second half of each half-cycle period is larger than the means value of the first half of each half-cycle period, (ii) no pulse current is contained in the second half of each half-cycle period, (iii) the AC lamp current has a maximum value immediately after polarity change between the positive and negative half-cycle periods, and (iv) the AC lamp current has also a waveform defined by that the ratio (d/a) of the maximum value (d) of the AC lamp current and a mean value (a) of the AC lamp current in its each half-cycle period satisfies a following equation. 1.05≦d/a≦1.80
摘要:
In a network system according to the present invention, in the case where a plurality of calls are set between specific terminal and the other terminal unit to conduct communication, when a communication fault is detected in a frame relay network, a representative call is decided from the plurality of calls, and all the calls except for the representative call are released. Thereafter, a call cut message including information relating to the calls to be released is transmitted from the frame relay network. In the specific terminal, the calls except for the representative call are released on the basis of the information of the calls to be released which is contained in the call cut message to transmit the call release message of the representative call. In the frame relay network, the representative call is released according to the call release message to transmit the call release completion message. Then, in the specific terminal, the representative call is released.
摘要:
A solenoid driving apparatus that drives a solenoid by intermittently supplying an exciting current comprises a first current switching element turned ON and OFF so as to switchably allow and block passage of the exciting current supplied to the solenoid L, a loop current circuit 3 being connected to the first current switching element and passing a loop current caused by stored energy in the solenoid when the supply of the exciting current to the solenoid is stopped by the first current switching element, and a second current switching element being disposed between the solenoid and a junction of the first current switching element and the loop current circuit, and being turned ON and OFF so as to switchably allow and block passage of the exciting current and the loop current.
摘要:
A solenoid driving apparatus that drives a solenoid by intermittently supplying an exciting current comprises a first current switching element turned ON and OFF so as to switchably allow and block passage of the exciting current supplied to the solenoid L, a loop current circuit 3 being connected to the first current switching element and passing a loop current caused by stored energy in the solenoid when the supply of the exciting current to the solenoid is stopped by the first current switching element, and a second current switching element being disposed between the solenoid and a junction of the first current switching element and the loop current circuit, and being turned ON and OFF so as to switchably allow and block passage of the exciting current and the loop current.
摘要:
A network system in which administrators of frame relay networks can recognize the quality of the ATM network suitably and manage the frame relay networks in accordance with the quality condition of the ATM network. When a frame F is transmitted from a frame relay network FR1 at a transmitting side to an IWF, a frame header in which a transmission number is stored is added to the frame F. Then, the frame F is received by a frame relay network FR2 at a transmitted side through the IWF and the ATM network. In the frame relay network FR2, a difference between the transmission number stored in the frame header of the frame F and a reception condition variable kept in the frame relay network FR2 is calculated, and the difference is stored in a quality information collection table as a number of discarded frames in the ATM network.
摘要:
A limited slip differential for a vehicle comprises a friction clutch disposed between a differential gear mechanism and a drive wheel axle, a clutch control cylinder for coupling and decoupling the friction clutch, a normally closed type solenoid valve for charging compressed air to the cylinder from a pressure air source and a normally opened type solenoid valve for discharging compressed air from the cylinder to the air. The normally closed type and normally opened type solenoid valves are operated by a control unit in response to a low .mu. road start, a low .mu. road run, a straight run and a brake so as to charge and discharge compressed air to and from the cylinder and thereby to control air pressure in the cylinder. A power device for a vehicle is composed by adding an engine control cylinder disposed in an acceleration control mechanism and an engine control valve for charging and discharging compressed air to the cylinder, and wherein during a low .mu. road run of the vehicle the engine control valve is operated by the control unit to charge compressed air to the engine control cylinder thereby to cause the engine control cylinder an acceleration return.