The most common switching circuit
Ton-turn-on time open
Toff-turn-off time off
Ts-storage time
Tf-fall time
Tr-rise time
Td-delay time
First, first clear meaning:
Ton- [on time] ton = td + tr
Tof- [off time]: tof = ts + tf
Ts ~ 【Storage time】: 10% of the maximum value of the falling edge of the input pulse, 10% of the maximum value of the output pulse falling edge;
Tf - [fall time]: 90% of the maximum output pulse down to 10% of the required time;
Tr --- [rise time]: for the output pulse, from the maximum 10% increase to 90% of the time required;
Td --- [delay time]: input pulse, the input pulse rising edge, up to 10% of the maximum time required.
Second, the impact on the switching circuit:
All of the above parameters will be on the switching circuit response speed, the maximum operating frequency impact, all the parameters are required as small as possible.
If the operating frequency is below the following electronic circuit, the basic need not discuss these parameters, the time parameters are mainly for high-frequency circuits such as computers (frequencies generally above 100 MHz) or require precision shaping of the signal circuit will highlight Its influence.
Third, add that:
The preceding parameters are obtained under the standard test conditions of the component / circuit. Generally, the [step signal], [square wave pulse], the test element / circuit under the action of the signal [response], (through the oscilloscope The resulting waveform) for parametric analysis.
Actual work conditions may differ from test conditions.
Upstairs other friends say are also in the rationale.
Transistor opening, closing, storage, rise, fall time determines the transistor switching speed, but after the conduction of a steady state of the size of the current without much impact.
Impact on the switching circuit:
All the time parameters will be on the switch circuit response speed, the maximum operating frequency impact, all the parameters are required as small as possible.
If the operating frequency is below the following electronic circuit, the basic need not discuss these parameters, the time parameters are mainly for high-frequency circuits such as computers (frequencies generally above 100 MHz) or require precision shaping of the signal circuit will highlight Its influence.
Supplementary explanation:
The preceding parameters are obtained under the standard test conditions of the component / circuit. Generally, the [step signal], [square wave pulse], the test element / circuit under the action of the signal [response], (through the oscilloscope The resulting waveform) for parametric analysis.
Actual work conditions may differ from test conditions.
Transistor in the switch circuit in the open and closed, due to the existence of barrier voltage, will produce a certain time delay. Storage, rise, fall mainly produce some cross-distortion, so that the circuit load of electricity becomes unstable ... ...
