Driving control circuit, bidirectional charger and electric automobile
A technology for driving control circuits and chargers, applied in electric vehicles, circuit devices, battery disconnect circuits, etc., can solve problems such as inability to achieve current overcurrent protection, MOS tube bursting, etc., to prevent bursting and avoid damage.
Inactive Publication Date: 2017-10-20
BEIJING ELECTRIC VEHICLE
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Problems solved by technology
[0005] The purpose of the embodiments of the present invention is to provide a drive control circuit, a bidirectional charger and an electric vehicle, so as to solve the problem that the current overcurrent protection cannot be realized when the comparative limit value is abnormal in the prior art, and the bidirectional charger in the Q1-Q4 four MOS tube burst problem
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[0041] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, the following will be described in detail with reference to the accompanying drawings and specific embodiments.
[0042] like figure 1 and figure 2 As shown in the figure, when the bidirectional charger is in the charging function or inverting function, the AC current sampling circuit will collect the current of the single-phase reversible AC / DC converter, such as figure 2 As shown in the figure, after the collected current passes through the AC current sampling circuit of the two-way charger, it is formed into an alternating DC signal EXT-AI-Iac whose zero point is at the preset voltage value. During the working process of the two-way charger, The limit value of the AC / DC signal needs to be monitored in real time to avoid damage to the bidirectional charger or the AC load caused by the excessively large AC / DC signal.
[0043]In the prior art...
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The invention provides a driving control circuit, a bidirectional charger and an electric automobile, and relates to the technical field of motor control. The driving control circuit comprises a comparison limit providing circuit, a first comparison circuit, a second comparison circuit and a logic judgment circuit, and is characterized in that the comparison limit providing circuit provides upper limit reference voltage and lower limit reference voltage, the first comparison circuit performs detection on acquired voltage of a first output end outputting the upper limit reference voltage and acquired voltage of a second output end outputting the lower limit reference voltage, the second comparison circuit performs detection on acquired alternating direct-current signals, and the logic judgment circuit outputs a control signal for controlling whether the bidirectional charger operates or not according to a first control signal outputted by the first comparison circuit and a second control signal outputted by the second comparison circuit. The scheme provided by the invention avoids a problem that an overcurrent fault cannot be determined because of an exception in reference voltage and a problem of transistor explosion caused by turning on or off four MOS transistors Q1-Q4 frequently when an overcurrent fault occurs, and finally ensures the bidirectional charger and an alternating-current load to be not damaged.
Description
technical field [0001] The invention belongs to the technical field of motor control of electric vehicles, and in particular relates to a drive control circuit, a bidirectional charger and an electric vehicle. Background technique [0002] The on-board bidirectional charger for electric vehicles is a device that can convert energy between the power grid and the power battery of the electric vehicle. The energy of the high-voltage power battery in the electric vehicle is converted into 220V / 50Hz alternating current to drive the AC load or charge the power battery of other electric vehicles. [0003] The topological structure of the on-board bidirectional charger is as follows: figure 1 As shown, whether it is a charging function or an inverter function, the four MOS tubes Q1-Q4 must be controlled by a certain control algorithm to achieve energy conversion, and the energy conversion is terminated when the four MOS tubes Q1-Q4 are all turned off. [0004] In the prior art, th...
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IPC IPC(8): H02J7/00H02J7/02
CPCH02J7/00304H02J7/0031H02J7/0036H02J7/0068H02J7/022H02J7/027H02J2207/20
Inventor 鲁卫申王云钊肖胜然庄启超蒋荣勋苏伟
Owner BEIJING ELECTRIC VEHICLE