Electronic relay

Claim 2

An electronic circuit (FIG. 1) for generating a voltage containing a direct current component the polarity of which is controlled by a keying voltage, comprising a first (8) and a second (9) transformer, each having a primary and a secondary winding, an input (1) for a keying voltage, a source of pulsating voltage (2), means (3 to 7) connected and responsive to the keying voltage on said input (1) for applying said pulsating voltage (2) to the primary winding of one of said transformers (8, 9) selected in dependence of the state of the keying voltage on said input (1), a first (14) and a second output terminal (15), a first (16) and a second diode (17), a first transistor (10) having an emitter, a base and a collector, said emitter connected via said first diode (16) to one end of the secondary winding of said first transformer (8) and the collector connected to said first output terminal (14), said first diode (16) having the same polarity as the emitterbase-diode of said first transistor, a second transistor (11) having an emitter, a base and a collector, said emitter connected via said second diode (17) to one end of the secondary winding of said second transformer (9), and the collector connected to said second output terminal (15), said second diode (17) having the same polarity as the emitter-base-diode of said second transistor, a first resistor (12) having one end connected to the base of said first transistor (10) and its other end connected to the other end of the secondary winding of said first transformer (8) and to said second output terminal (15), and a second resistor (13) having one end connected to the base of said second transistor (11) and its other end connected to the other end of the secondary winding of said second transformer (9) and to said first output terminal (14).

Claim 3

An electronic circuit for generating a voltage containing a direct current component the polarity of which is controlled by an input keying voltage, comprising a first and a second transformer, each having a primary and a secondary winding, a source of pulsating voltage, means responsive to said input keying voltage for applying the pulsating voltage to the primary winding of one of said transformers selected in dependence of the state of said input keying voltage, a first and a second output terminal, a first and a second diode, a first transistor having an emitter, a base and a collector, said emitter connected to one end of the secondary winding of said first transformer (8), and the collector connected via said first diode to said first output terminal, said first diode having the same polarity as the emitter-base-diode of said first transistor, a second transistor having an emitter, a base and a collector, said emitter connected to one end of the secondary winding of said second transformer, and the collector connected via said second diode to said second output terminal, said second diode having the same polarity as the emitter-base-diode of said second transistor, a first resistor having one end connected to the base of said first transistor and its other end connected to the other end of the secondary winding of said first transformer and to said second output terminal, and a second resistor having one end connected to the base of said second transistor and its other end connected to the other end of the secondary winding of said second transformer and to said first output terminal.

Claim 4

An electronic circuit for generating a voltage containing a direct current component the polarity of which is controlled by an input keying voltage, comprising a first and a second transformer, each having a primary and a secondary winding, a source of pulsating voltage, means responsive to said input keying voltage for applying the pulsating voltage to the primary winding of one of said transformers selected in dependence of the state of said input keying voltage, a first and a second output terminal, a first and a second diode, a first transistor having an emitter, a base and a collector, said emitter connected to one end of the secondary winding of said first transformer (8), and the collector connected via said first diode to said first output terminal, said first diode having the same polarity as the emitter-base-diode of said first transistor, a second transistor having an emitter, a base and a collector, said emitter connected to one end of the secondary winding of said second transformer, and the collector connected via said second diode to said second output terminal, said second diode having the same polarity as the emitter-base-diode of said second transistor, a first resistor having one end connected to the base of said first transistor and its other end connected to the other end of the secondary winding of said first transformer and to said second output terminal, and a second resistor having one end connected to the base of said second transistor and its other end connected to the other end of the secondary winding of said second transformer and to said first output terminal.

Claim 5

An electronic circuit (FIG. 2) for generating a voltage containing a direct current component the polarity of which is controlled by a keying voltage input, comprising a first (8) and a second transformer (9), each having a primary and a secondary winding, a source of pulsating voltage (2), means (2, 20) connected and responsive to said keying voltage input (1) for applying said pulsating voltage to the primary winding of one of said transformers (8, 9) selected in dependence of the state of the keying voltage input (1), a first (14) and a second output terminal (15), a first full-wave rectifier circuit (18) having an alternating current input connected to the secondary winding of said first transformer (8), and two direct current output terminals, a second full-wave rectifier circuit (19) having an alternating current input connected to the secondary winding of said second transformer (9), and two direct current output terminals, a first transistor (10) having an emitter connected to one of said direct current output terminals of said first full-wave rectifier circuit (18), a collector connected to said first output terminal (14), and a base, a second transistor (11) having an emitter connected to one of said direct current output terminals of said second full-wave rectifier circuit (19), a collector connected to said second output terminal (15), and a base, a first resistor (12) having one end connected to the base of said first transistor (10) and its other end connected to the other of said direct current output terminals of said first full-wave rectifier circuit (18) and to said second output terminal (15), and a second resistor (13) having one end connected to the base of said second transistor (11) and its other end connected to the other of said direct current output terminals of said second full-wave rectifier circuit (19) and to said first output terminal (14).

Claim 6

An electronic circuit (FIG. 2) for generating a voltage containing a direct current component the polarity of which is controlled by a keying voltage input, comprising a first (8) and a second transformer (9), each having a primary and a secondary winding, a source of pulsating voltage (2), means (2, 20) connected and responsive to said keying voltage input (1) for applying said pulsating voltage to the primary winding of one of said transformers (8, 9) selected in dependence of the state of the keying voltage input (1), a first (14) and a second output terminal (15), a first full-wave rectifier circuit (18) having an alternating current input connected to the secondary winding of said first transformer (8), and two direct current output terminals, a second full-wave rectifier circuit (19) having an alternating current input connected to the secondary winding of said second transformer (9), and two direct current output terminals, a first transistor (10) having an emitter connected to one of said direct current output terminals of said first full-wave rectifier circuit (18), a collector connected to said first output terminal (14), and a base, a second transistor (11) having an emitter connected to one of said direct current output terminals of said second full-wave rectifier circuit (19), a collector connected to said second output terminal (15), and a base, a first resistor (12) having one end connected to the base of said first transistor (10) and its other end connected to the other of said direct current output terminals of said first full-wave rectifier circuit (18) and to said second output terminal (15), and a second resistor (13) having one end connected to the base of said second transistor (11) and its other end connected to the other of said direct current output terminals of said second full-wave rectifier circuit (19) and to said first output terminal (14).

Claim 7

An electronic circuit (FIG. 3) for generating a voltage containing a direct current component the polarity of which is controlled by a keying voltage input, comprising, a transformer (28) having one primary winding and one secondary winding, a pulse train source (22), means (23 to 27) connected and responsive to said keying voltage input (21) for applying a pulse train from said source (22) to said primary winding, the pulses of said train being shorter than the pulse spacings and the applied pulse polarity being inversed in dependence on the state of the keying voltage input (21), two output terminals (34, 35), two transistors (30, 31), each having an emitter, a collector and a base, said emitters connected each to one end of said secondary winding, said collectors connected each to one of said output terminals (34, 35), and a resistor (32) connecting the bases of said transistors (30, 31) with each other, two diodes (40, 41) each shunting the emitter-collector path of one of said transistors (30, 31) and having the same polarity as the collector-base diode of the associated transistor, the transformer ratio being so selected that the secondary voltage corresponding to the pulses exceeds the reverse breakdown voltage of the transistor base-emitter diode, but the secondary voltage corresponding to the pulse spacings does not reach the reverse breakdown voltage of the transistor base-emitter diode, and the transistor type being so selected that it is not destroyed by the aforementioned breakdown.

Claim 8

An electronic circuit (FIG. 3) for generating a voltage containing a direct current component the polarity of which is controlled by a keying voltage input, comprising, a transformer (28) having one primary winding and one secondary winding, a pulse train source (22), means (23 to 27) connected and responsive to said keying voltage input (21) for applying a pulse train from said source (22) to said primary winding, the pulses of said train being shorter than the pulse spacings and the applied pulse polarity being inversed in dependence on the state of the keying voltage input (21), two output terminals (34, 35), two transistors (30, 31), each having an emitter, a collector and a base, said emitters connected each to one end of said secondary winding, said collectors connected each to one of said output terminals (34, 35), and a resistor (32) connecting the bases of said transistors (30, 31) with each other, two diodes (40, 41) each shunting the emitter-collector path of one of said transistors (30, 31) and having the same polarity as the collector-base diode of the associated transistor, the transformer ratio being so selected that the secondary voltage corresponding to the pulses exceeds the reverse breakdown voltage of the transistor base-emitter diode, but the secondary voltage corresponding to the pulse spacings does not reach the reverse breakdown voltage of the transistor base-emitter diode, and the transistor type being so selected that it is not destroyed by the aforementioned breakdown.

Claim 9

An electronic circuit (FIG. 3) for generating a voltage containing a direct current component the polarity of which is controlled by a keying voltage input, comprising a transformer (28) having one primary winding and one secondary winding, a pulse train source (22), means (23 and 27) connected to and responsive to said keying voltage input (21) for applying a pulse train from said source (22) to said primary winding, the pulses of said train being shorter than the pulse spacings and the applied pulse polarity being inversed in dependence on the state of the keying voltage input (21), two output terminals (34, 35), two transistors (30, 31), each Having an emitter a collector and a base, said emitters connected each to one end of said secondary winding, said collectors connected each to one of said output terminals (34, 35), a resistor (32) connecting the bases of said transistors (30, 31) with each other, two diodes (40, 41) each shunting the emitter-collector path of one of said transistors (30, 31), and having the same polarity as the collector-base diode of the associated transistor, two serial connections of a Zener diode and a diode (36, 38 and 37, 39 resp.) each shunting the emitter-base diode of one of said transistors (30 or 31 resp.), so that the forward direction of the Zener diode corresponds and the forward direction of the diode is opposed to the forward direction of the emitter-base diode of the associated transistor, the transformer ratio being so selected that the secondary voltage corresponding to the pulses exceeds and the secondary voltage of the pulse spacings does not reach the Zener diode breakdown voltage.

Claim 10

An electronic circuit (FIG. 3) for generating a voltage containing a direct current component the polarity of which is controlled by a keying voltage input, comprising a transformer (28) having one primary winding and one secondary winding, a pulse train source (22), means (23 and 27) connected to and responsive to said keying voltage input (21) for applying a pulse train from said source (22) to said primary winding, the pulses of said train being shorter than the pulse spacings and the applied pulse polarity being inversed in dependence on the state of the keying voltage input (21), two output terminals (34, 35), two transistors (30, 31), each Having an emitter a collector and a base, said emitters connected each to one end of said secondary winding, said collectors connected each to one of said output terminals (34, 35), a resistor (32) connecting the bases of said transistors (30, 31) with each other, two diodes (40, 41) each shunting the emitter-collector path of one of said transistors (30, 31), and having the same polarity as the collector-base diode of the associated transistor, two serial connections of a Zener diode and a diode (36, 38 and 37, 39 resp.) each shunting the emitter-base diode of one of said transistors (30 or 31 resp.), so that the forward direction of the Zener diode corresponds and the forward direction of the diode is opposed to the forward direction of the emitter-base diode of the associated transistor, the transformer ratio being so selected that the secondary voltage corresponding to the pulses exceeds and the secondary voltage of the pulse spacings does not reach the Zener diode breakdown voltage.