Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
225 words
A bidirectional constant current driving circuit having an input terminal (1), an output terminal (2) and first and second power supply terminals (V P ,V N ), for driving a load (3) coupled to said output terminal in response to an input signal (V A ) applied to said input terminal (1), comprising: a) first transistor means (12) having a first electrode connected to said first power supply terminal (V P); b) second transistor means (11) having a first electrode connected to said first power supply terminal (Vp), and second and third electrodes connected to a second electrode of said first transistor means (11); c) third transistor means (14) having a first electrode connected to said second power supply terminal (V N ); d) fourth transistor means (13) having a first electrode connected to said second power supply terminal (V N ), and second and third electrodes connected to a second electrode of said third transistor means (14); e) first and second resistor means (15,16) serially connected between the third electrode of said second transistor means (11) and that of said fourth transistor means (13), the junction of said first and second resistor means (15,16) being connected to said input terminal (1); and f) coupling means for coupling the third electrodes of said first and third transistor means (12,14) to said output terminal (2), respectively.
Claim 2
Dependent Claim
225 words
A bidirectional constant current driving circuit having an input terminal (1), an output terminal (2) and first and second power supply terminals (V P ,V N ), for driving a load (3) coupled to said output terminal in response to an input signal (V A ) applied to said input terminal (1), comprising: a) first transistor means (12) having a first electrode connected to said first power supply terminal (V P); b) second transistor means (11) having a first electrode connected to said first power supply terminal (Vp), and second and third electrodes connected to a second electrode of said first transistor means (11); c) third transistor means (14) having a first electrode connected to said second power supply terminal (V N ); d) fourth transistor means (13) having a first electrode connected to said second power supply terminal (V N ), and second and third electrodes connected to a second electrode of said third transistor means (14); e) first and second resistor means (15,16) serially connected between the third electrode of said second transistor means (11) and that of said fourth transistor means (13), the junction of said first and second resistor means (15,16) being connected to said input terminal (1); and f) coupling means for coupling the third electrodes of said first and third transistor means (12,14) to said output terminal (2), respectively.
Claim 3
Dependent Claim
44 words
A bidirectional constant current driving circuit as claimed in Claim 1, wherein each of said first and second transistor means (12,11) has an inverse conductive junction structure with respect to the conductive junction structure of each of said third and fourth transistor means (14,13).
Claim 4
Dependent Claim
41 words
A bidirectional constant current driving circuit as claimed in Claim 1 or 2, wherein each of said first and second transistor means (12,11) comprises a PNP transistor, and each of said third and fourth transistor means (14,13) comprises an NPN transistor.
Claim 5
Dependent Claim
41 words
A directional constant current driving circuit as claimed in any one of Claims 1 to 3, wherein said coupling means includes a Zener diode (17) provided between said output terminal (2) and the third electrode of said third transistor means (14).
Claim 6
Dependent Claim
29 words
A directional constant current driving circuit as claimed in any of one Claims 1 to 4, wherein said first, second, third electrodes are emitter, base and collector electrodes, respectively.