H - Electricity – 05 – B
Patent
H - Electricity
05
B
328/175
H05B 1/02 (2006.01) H02M 5/458 (2006.01) H02M 7/539 (2006.01) H03K 3/023 (2006.01) H03K 3/2897 (2006.01) H05B 6/06 (2006.01)
Patent
CA 1108249
CONTROL CIRCUIT FOR GENERATING A STEP-TYPE CONTROL SIGNAL AND A CONTINUOUSLY VARYING CONTROL SIGNAL WHOSE AMPLITUDE CHARACTERISTIC REPEATS AT THE STEP TRANSITION ABSTRACT OF THE DISCLOSURE A control circuit for use with an adjustable resistance to generate a first control signal whose amplitude is a function of the setting of the resistance, and which varies substantially continuously as the resistance varies, and to generate a second control signal which appears as step-like signal whose level is changed over from a first level to a second level at a predeter- mined setting of the resistance. A pair of transistors is provided with their emitter electrodes connected in common to a reference potential and with the variable resistance coupled to the collector electrode of one transistor. The adjustable output tap from which the first control signal is derived is connected to the base elec- trode of the one transistor. An impedance is coupled to the collector circuit of the one transistor, and a current source is connected in common to the variable resistance and to the impedance such that the variable resistance and impedance are coupled between the collector circuit and the current source. An output of the impedance is connected to the base electrode of the other transistor, and the second control signal is derived from the collector electrode of the other transistor, whereby as the setting of the adjustable output tap changes, the voltage applied to the base electrode of the one transistor, as well as the first control signal, correspond- ingly changes from a first amplitude toward a second amplitude until the predetermined setting is reached, whereupon the relative conduc- tivities of the transistors is reversed and the first control signal changes back to the first amplitude. Thus, if the setting of the adjustable resistance increases from, for example, an initial setting, the first control signal correspondingly increases from a first amplitude. When the predetermined setting is reached, the second control signal undergoes a step-wise transition, and the first control signal returns to its initial amplitude which is further increased with additional increases in the setting of the adjustable resistance. This control circuit advantageously can be used to selectively control either of two devices, wherein one device is controlled as a function of the first control signal when the second control signal is at one level, and the other device is controlled as a function of the first control signal when the second control signal is at its other level. The control circuit also can be used to control the operation of a device over first and second operational ranges, the first range being selected when the second control signal is at its first level, and the second range being selected when the second control signal is at its second level.
308951
Kanazawa Kenichi
Tanaka Yukio
Gowling Lafleur Henderson Llp
Sony Corporation
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