Patent ID: 8108162
Filing Date: 2012-01-31
Classification: G01R

Abstract:
1. A load calculation control method used for load characteristic test of an electric generator, wherein when a resistor bank group is divided into two or more, a total power capacity of all resistors is divided and allocated to respective resistor banks which are determined one after another in a decreasing manner from a higher priority to a lower priority by comparison operation, a combination of ON/OFF of the respective resistor banks is automatically adjusted in sequence from the higher priority to the lower priority and calculated, thereby allowing a load control value to be continuously and automatically changed during the conduction of the load characteristic test in a follow-up manner in order to approximate a target value, the method comprising the steps of: after dividing the resistor bank group connected in parallel to a power supply unit via a power cable into two or more (in a range of 2 to N, where N is a natural number), allocating to a first to N-th divided resistor banks the results which is determined by dividing a total maximum power capacity of the resistor bank group sequentially based on binary system and arranging the results in an order from a higher priority to a lower priority of the power capacity corresponding to ½ to 1/(2 after a target load control value is selected by the use of control means connected to each of the resistor banks, by first calculation means within a comparison and transmission circuit within the control means, comparing a power capacity to be held by the first resistor bank corresponding to the first calculation means with a current load control value, and if the current load control value is not less than the power capacity, storing a value obtained by subtracting the power capacity from the current load control value as a remainder value by the control means, transmitting the remainder value to second calculation means in an analog manner, and transmitting in analog manner a digital signal representing ON-state to the first resistor bank, while when the current load control value is less than the power capacity, the current load control value is transmitted to the second calculation means in an analog manner; in the second to N-th calculations, sequentially comparing the remainder value received from the calculation means of next higher priority or the current load control value with the power capacity of the resistor bank of next lower priority, wherein in each calculation, if the received remainder value or the current load control value is not less than the power capacity of the resistor bank, the power capacity is subtracted from the remainder value, the result is stored as a remainder value of next lower priority and is then transmitted to calculation means of next lower priority in an analog manner, and a digital signal representing ON-state is transmitted to the resistor bank corresponding to the current calculation means, while when the remainder value received from the next higher priority or the current load control value is less than the power capacity of the resistor bank of the next lower priority, the remainder value of next higher priority is transmitted as a remainder value of next lower priority to the calculation means of next lower priority in an analog manner; and repeating said second to N-th calculations to continuously determine a select combination of the respective resistor banks in which resistor bank ON/OFF state is automatically adjusted for the respective resistor banks in sequence from higher priority to lower priority so that the current load control value, which fluctuates by the convergence of the resistor banks, is continuously adjusted in a follow-up manner to approximate said target load control value.