Hysteresis comparison control circuit
A technology of control circuit and hysteresis comparison, applied in the field of control circuit with hysteresis function, can solve the problems of complicated operation, shortened fan life, self-locking, etc., to achieve stable and reliable operation, low static power consumption, and wide application.
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[0077] First embodiment
[0078] like picture 2-1 As shown in the circuit diagram according to a first embodiment of the present invention, it includes NPN transistor Ql, NPN transistor Q2, PNP transistors Q3, PNP transistor Q4, diode D1, a diode D2, a diode D3, resistors R1A, resistor RlB, R2A, resistor, resistor R2B, resistor R3, a resistor R4, a resistor R5.
[0079] The other end of transistor Q1 base simultaneously connected resistors R1B and one end of resistor R1A is, one end of resistor R1A is connected to the cathode of the diode D1, the anode of the diode D1 is connected simultaneously controlling the anode signal Vc and the diode D2; the other end of resistor R1B is simultaneously connected ground terminal GND and the emitter of transistor Q1; another end of the resistor R3 is connected to the collector of the transistor Q1, the resistor R3 is connected to the base of transistor Q3, the emitter of transistor Q3 is connected the input voltage Vin, the transistor Q3 is co...
Example
[0094] Second embodiment
[0095] like image 3 As shown in the circuit diagram of a second embodiment of the present invention, compared with the first embodiment of the present invention, the difference of the second embodiment further includes a capacitor C1 and a capacitor C2, a capacitor C1 is connected across transistor Q1 between the base and the emitter, capacitor C2 is connected across the base of transistor Q2 and the emitter.
[0096] After increasing the capacitance C1 and the capacitor C2, and the control signal C2 will bypass the high-frequency interference signal Vc at the capacitor C1 is, to ensure that the transistors Q1 and Q2 does not mistakenly turn off or malfunction, thereby improving the circuit's noise immunity.
[0097] Compared with the first embodiment of the present invention, the basic principle of the second embodiment is not essentially different, are not repeated here.
Example
[0098] Third embodiment
[0099] like Pic 4-1 , The third embodiment of the principles of the present invention, FIG embodiment, as compared with the first embodiment of the present invention, differs from the third embodiment in that, further comprising a resistor R6 and a resistor R7, a resistor R6 is connected to one end of transistor Q3 emitter, the other end of the resistor R6 is connected to the collector of transistor Q1; end of the resistor R7 is connected to emitter of transistor Q4 is, the other end of the resistor R7 is connected to the collector of transistor Q2.
[0100] After increasing the resistors R6 and R7, the transistor Q1 and the collector bias current of transistor Q2 addition of a road, this can more easily adjust the operating state of the transistor Q3 and the transistor Q4 (the enlarged region or saturation region), the circuit debugging easier. Compared with the first embodiment of the present invention, the working principle of the third embodiment is n...
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