Electric power control device in an automatic temperature adjusting apparatus

• US 4,723,068 A
• Filed: 02/24/1986
• Issued: 02/02/1988
• Est. Priority Date: 04/17/1985
• Status: Expired due to Fees

• Current Assignee: SCREEN Holdings Co., Ltd.
• Original Assignee: SCREEN Holdings Co., Ltd.
• Inventors: Kusuda, Tatsufumi
• Primary Examiner(s): PASCHALL, MARK H
• Application Number:
  US06/833,082
• Time in Patent Office: 708 Days
• Field of Search: 219/483, 219/508, 219/486, 219/484, 219/501, 219/497, 219/499, 219/308, 219/309, 219/330, 219/331, 219/494, 219/497, 323/319, 323/235, 323/236, 307/38-41
• US Class Current: 219/486
• CPC Class Codes: G05D 23/1912 whose output amplitude can take more than two discrete values
• CPC Class Codes: G05D 23/20 with sensing elements having variation of electric or magnetic properties with change of temperature G05D23/13 takes precedence

Abstract

An electric power control device is composed of plural resistor loads (1₀ -1₄) the heat-generating powers of which are different from one another, switch means (3₀ -3₄) connected in series to each of the resistor loads and adapted for the ON-OFF control of an ac power (2), and means (4₀ -4₄) for ON-OFF controlling the switch means so as to turn on or turn off the ac power and also for selectively controlling the individual resistor loads so as to adjust the heat-generating powers of all of the resistor loads in accordance with their corresponding desired heat-generating powers.

Claims

1. An electronic power control device, comprising:

a plurality of resistive loads the heat-generating powers of which vary from one another by successive integer exponential powers of a preselected number;

a plurality of switch means each connected in series to a different one of said resistive loads and adapted for ON-OFF control of AC power to said load; and

means for ON-OFF controlling the switch means to turn on or turn off the AC power and also, whenever change in power to said resistive loads is desired, for controlling the individual resistive loads to adjust the collective heat-generating power of said resistive loads in a stepwise manner by stepping said power up or down by a constant value.

2. An electric power control device as claimed in claim 1, wherein said controlling means comprises a binary counter having a plurality of binary outputs, each of said binary ouputs being coupled to a resistive one of said resistive layers.

3. An electronic power control device, comprising:

a plurality of resistive loads the heat-generating powers of which vary from one another by successive integer exponential powers of 2;

a plurality of switch means each connected in series to a different one of said resistive loads and adapted for ON-OFF control to AC power to said load; and

means for ON-OFF controlling the switch means to turn on or turn off the AC power and also, whenever change in power to said resistive loads is desired, for controlling the individual resistive loads to adjust the collective heat-generating powers of said resistive loads in a stepwise manner by stepping said power up or down by a constant value;

said means for ON-OFF controlling the switch means including a binary counter with a plurality of outputs of successive integer exponential powers of 2, each of said outputs connected to a corresponding one of said resistive loads via a respective one of said switch means.