Method and device for controlling two-wire discharge circuit of battery
First Claim
1. A method for controlling a two-wire discharge circuit of a battery, comprising:
- determining a positive-bus voltage and a negative-bus voltage in the two-wire discharge circuit of the battery, and comparing the positive-bus voltage with the negative-bus voltage to obtain a first voltage difference signal;
regulating the first voltage difference signal by a proportional integral (PI) regulator, to obtain a first pulse width modulation (PWM) signal;
for each of first discharge branches in the two-wire discharge circuit of the battery, taking a sum of the first PWM signal and a determined initial master control PWM signal corresponding to the first discharge branch as an adjusted master control PWM signal corresponding to the first discharge branch, and performing drive control on a switch transistor for controlling a charge-discharge time period of a bus capacitor in the first discharge branch by the adjusted master control PWM signal corresponding to the first discharge branch, wherein a terminal of the first discharge branch is connected to a positive electrode of a power supply in the two-wire discharge circuit of the battery, and the other terminal of the first discharge branch is connected to a system neutral point; and
for each of second discharge branches in the two-wire discharge circuit of the battery, taking a difference between a determined initial master control PWM signal corresponding to the second discharge branch and the first PWM signal as an adjusted master control PWM signal corresponding to the second discharge branch, and performing drive control on a switch transistor for controlling a charge-discharge time period of a bus capacitor in the second discharge branch by the adjusted master control PWM signal corresponding to the second discharge branch, wherein a terminal of the second discharge branch is connected to a negative electrode of the power supply in the two-wire discharge circuit of the battery, and the other terminal of the second discharge branch is connected to the system neutral point;
wherein for any one of the discharge branches, the initial master control PWM signal corresponding to the discharge branch is obtained by controlling the two-wire discharge circuit of the battery in a dual-loop control manner comprising a full-bus voltage outer loop and a closed loop of an average value of inductor currents in the two-wire discharge circuit of the battery, or by controlling the discharge branch in a dual-loop control manner comprising a full-bus voltage outer loop and a closed loop of an actual value of an inductor current in the discharge branch.
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Accused Products
Abstract
A method and device for controlling a two-wire discharge circuit of a battery, introducing a whole-bus voltage outer loop and an inductive current average value or inductive current actual value closed loop as a main control loop of the two-wire discharge circuit of the battery so as to guarantee a stable voltage of the whole bus. On the basis of the main control loop, duty ratios of switch transistors in respective discharge branches are adjusted to control the respective discharge branches to independently charge and discharge corresponding half-buses so as to balance the bus voltage. The method and the device avoid accessing a central wire of the battery and any additional circuits, and satisfy a technical specification of a three-wire access of the battery, thereby improving a circuit performance of the two-wire discharge circuit of the battery.
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Citations
13 Claims
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1. A method for controlling a two-wire discharge circuit of a battery, comprising:
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determining a positive-bus voltage and a negative-bus voltage in the two-wire discharge circuit of the battery, and comparing the positive-bus voltage with the negative-bus voltage to obtain a first voltage difference signal; regulating the first voltage difference signal by a proportional integral (PI) regulator, to obtain a first pulse width modulation (PWM) signal; for each of first discharge branches in the two-wire discharge circuit of the battery, taking a sum of the first PWM signal and a determined initial master control PWM signal corresponding to the first discharge branch as an adjusted master control PWM signal corresponding to the first discharge branch, and performing drive control on a switch transistor for controlling a charge-discharge time period of a bus capacitor in the first discharge branch by the adjusted master control PWM signal corresponding to the first discharge branch, wherein a terminal of the first discharge branch is connected to a positive electrode of a power supply in the two-wire discharge circuit of the battery, and the other terminal of the first discharge branch is connected to a system neutral point; and for each of second discharge branches in the two-wire discharge circuit of the battery, taking a difference between a determined initial master control PWM signal corresponding to the second discharge branch and the first PWM signal as an adjusted master control PWM signal corresponding to the second discharge branch, and performing drive control on a switch transistor for controlling a charge-discharge time period of a bus capacitor in the second discharge branch by the adjusted master control PWM signal corresponding to the second discharge branch, wherein a terminal of the second discharge branch is connected to a negative electrode of the power supply in the two-wire discharge circuit of the battery, and the other terminal of the second discharge branch is connected to the system neutral point; wherein for any one of the discharge branches, the initial master control PWM signal corresponding to the discharge branch is obtained by controlling the two-wire discharge circuit of the battery in a dual-loop control manner comprising a full-bus voltage outer loop and a closed loop of an average value of inductor currents in the two-wire discharge circuit of the battery, or by controlling the discharge branch in a dual-loop control manner comprising a full-bus voltage outer loop and a closed loop of an actual value of an inductor current in the discharge branch. - View Dependent Claims (2, 3, 4, 5, 11, 12)
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6. A device for controlling a two-wire discharge circuit of a battery, comprising:
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an initial signal determining module configured to;
for each of discharge branches in the two-wire discharge circuit of the battery, obtain an initial master control PWM signal corresponding to the discharge branch by controlling the two-wire discharge circuit of the battery in a dual-loop control manner comprising a full-bus voltage outer loop and a closed loop of an average value of inductor currents in the two-wire discharge circuit of the battery or by controlling the discharge branch in a dual-loop control manner comprising a full-bus voltage outer loop and a closed loop of an actual value of an inductor current in the discharge branch;a fine-adjusted signal determining module configured to;
determine a positive-bus voltage and a negative-bus voltage in the two-wire discharge circuit of the battery, compare the positive-bus voltage with the negative-bus voltage to obtain a first voltage difference signal;
regulate the first voltage difference signal by a proportional integral (PI) regulator to obtain a first PWM signal;
for each of first discharge branches in the two-wire discharge circuit of the battery, take a sum of the first PWM signal and the determined initial master control PWM signal corresponding to the first discharge branch as an adjusted master control PWM signal corresponding to the first discharge branch, wherein a terminal of the first discharge branch is connected to a positive electrode of a power supply in the two-wire discharge circuit of the battery, and the other terminal of the first discharge branch is connected to a system neutral point; and
for each of second discharge branches in the two-wire discharge circuit of the battery, take a difference between the determined initial master control PWM signal corresponding to the second discharge branch and the first PWM signal as an adjusted master control PWM signal corresponding to the second discharge branch, wherein a terminal of the second discharge branch is connected to a negative electrode of the power supply in the two-wire discharge circuit of the battery, and the other terminal of the second discharge branch is connected to the system neutral point; anda circuit drive control module configured to, for each of the discharge branches in the two-wire discharge circuit of the battery, perform drive control on a switch transistor for controlling a charge-discharge time period of a bus capacitor in the discharge branch by the adjusted master control PWM signal corresponding to the discharge branch. - View Dependent Claims (7, 8, 9, 10, 13)
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Specification