100W 1~3 Output with battery Charger QP-100 series Features : Universal AC input / Full range Auto switch when power off (UPS function) Built-in constant current limiting circuit Alarm signal for AC OK and Battery low (TTL open collector output or Relay contact output) Protections: Short ...
This is similar to the prior circuit but adds a second "feedback" transistor to steal base current from the first if the voltage across the emitter resistor exceeds theVbevoltage. This negative feedback has the effect of limiting the current toVbe/RswhereVbeis for the second feedback transist...
LED constant-current drive circuit An LED constant-current drive circuit includes a BUCK circuit consisting of a transformer T, a diode D, a capacitor C and a field effect transistor Q a voltage limiting circuit consisting of a resistor R, a diode D, a capacitor C, a resi... G Yuan,Y...
The current limiting signal may be applied to the common control terminal 23 via a resistor 33. (Fig. 4), or may be applied to a control MOSFET 7. If an adjustable voltage rather than a constant reference voltage 5, is applied to the reference input of amplifier 4, the circuit may be...
A current-limiting circuit which can prevent the power switch on the chip from being under attack of high-current was designed for boost DC-DC converter. T... C Wu,D Li,F Yin,... - 《Semiconductor Technology》 被引量: 1发表: 2009年 Research on Changeable Driving-current Technology of ...
circuit in one polarity direction and a current limiting circuit including the transistor for preventing damage to the transistor from high voltage in the opposite polarity direction, and a voltage comparison circuit responsive to a high voltage in the opposite direction for reverse biasing the high ...
Needed constant current is provided for load by input given current; and the constant-current source circuit comprises a field effect transistor VT, a first operational amplifier A1, a second operational amplifier A2, a current-limiting resistor R0, a first resistor R1, a second resistor R2, a...
PURPOSE: To eliminate an overheat fire, etc., by no change in a current even in the case of a short-circuiting at a load end by using a through-type coupling transformer as means for obtaining power of the same quality even for any load to a transmission end of a distribution line. ...
A constant current line circuit for connection to balanced tip and ring leads of a telephone line and unbalanced transmit and receive leads of a PABX. A differential amplifier receives and applies inc
Current limiting output circuit with output feedback The maximum output current of the driver is limited to a value which remains substantially constant over a wide range of processing parameters, operating temperature and load impedance.doi:US4275313 AHarry J. Boll... HJ Boll,RM Goldstein - US...