Method and device for automatically switching and adjusting the load of a battery discharger
First Claim
1. A method for automatically switching and adjusting the load of a battery discharger, comprising:
- a step of setting the discharge conditions in which the discharge current, discharge voltage, discharge time and end voltage are set;
a step of setting the main load (stationary load) in which the number of constant power PTC units to be operated is determined based on the values set in the previous step;
a step of setting the switched load in which the number of resistive heating elements to be activated is selected by detecting the current changes;
a step of micro-adjusting the load current in which the operating current of a plurality of additional resistive heating elements is automatically micro-adjusted by way of a PWM to complement the difference between the set current and the actual current, thereby achieving a discharge with constant discharge current;
a step of detecting in which whether the number of resistive heating elements to be switched is determined based on the pulse changes of the PWM; and
a step of switching the load in which the number of resistive heating elements which act as the switched load is adjusted based on the results of the detecting step.
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Abstract
A method for automatically switching and adjusting the load of a battery discharger by using PTC (positive temperature coefficient) units and resistive heating elements as the load. The automatic switching and adjustment is accomplished by the steps of selecting the number of operating PTC units with constant power by the user; selecting the number of operating resistive heating elements based on the detected current changes; and automatically micro-adjusting the current of other resistive heating elements to obtain a discharge with a constant current. The present invention further provide a device for implementing the method for automatically switching and adjusting the load of a battery discharger.
12 Citations
9 Claims
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1. A method for automatically switching and adjusting the load of a battery discharger, comprising:
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a step of setting the discharge conditions in which the discharge current, discharge voltage, discharge time and end voltage are set; a step of setting the main load (stationary load) in which the number of constant power PTC units to be operated is determined based on the values set in the previous step; a step of setting the switched load in which the number of resistive heating elements to be activated is selected by detecting the current changes; a step of micro-adjusting the load current in which the operating current of a plurality of additional resistive heating elements is automatically micro-adjusted by way of a PWM to complement the difference between the set current and the actual current, thereby achieving a discharge with constant discharge current; a step of detecting in which whether the number of resistive heating elements to be switched is determined based on the pulse changes of the PWM; and a step of switching the load in which the number of resistive heating elements which act as the switched load is adjusted based on the results of the detecting step. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device for automatically switching and adjusting the load of a battery discharger, comprising:
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a processing unit for determining an appropriate number of PTC units to be operated based on the conditions set and determining an appropriate number of resistive heating elements to be switched based on the detected actual current; a PWM unit for activating an appropriate number of additional resistive heating elements based on the current changes and micro-adjusting the operating current of the additional resistive heating elements to meet the requirement for discharge current; and a detecting unit for detecting the pulse width of a PWM unit, thereby instructing switching of the resistive heating elements. - View Dependent Claims (8, 9)
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Specification