A photovoltaic motor driver weak power control circuit and method
A motor driver and power control technology, applied in the direction of AC motor control, photovoltaic power generation, battery circuit devices, etc., can solve the problems of inability to realize driver MPPT control, complex circuit, and high cost, so as to improve the starting power of the motor, prolong the running time, Avoid the effect of startup failure
Active Publication Date: 2022-05-27
湖南科比特电气技术有限公司
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Problems solved by technology
The principle of this invention is to add a set of charging circuit, power storage device and output circuit on the basis of the control circuit to improve the utilization rate of solar energy. Therefore, the circuit of this scheme is complex, bulky and costly; Continuous MPPT control of the drive cannot be achieved during the entire working cycle
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[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0033] like figure 1As shown, a photovoltaic motor driver weak power control circuit includes MCU, photovoltaic module PV, Boost circuit, three-phase inverter circuit G4, input current sensor H1, bus capacitor C3, input voltage detection circuit G1, bus voltage detection circuit G3 and motor, and also includes bus energy storage circuit, energy storage super capacitor slow start and discharge circuit, energy storage super capacitor voltage detection circuit G2, the Boost circuit is composed of input filter capacitor C1, Boost inductor L1, Boost power tube Q1 and Boost Diode D1, the three-phase inverter circuit G4 is composed of 6 inverter power tubes Q4-Q9, and the bus energy storage circuit is composed of a super capacitor module C2 and a super capacitor discharge switch tube Q3. Capacitor slow-start and discharge are composed of power resistor R1, supe...
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The invention discloses a photovoltaic motor driver weak power control circuit, comprising MCU, photovoltaic module, Boost circuit, three-phase inverter circuit, input current sensor, bus capacitance, input voltage detection circuit, bus voltage detection circuit, motor, bus storage energy circuit, energy storage supercapacitor slow start and discharge circuit and energy storage supercapacitor voltage detection circuit. The invention also discloses a control method for the weak power control circuit of the photovoltaic motor driver. The implementation of the present invention can realize the normal operation of the driver under extremely low input power, realize the continuous MPPT control of the photovoltaic module under weak light conditions, prolong the running time of the driver, and make full use of the energy of the module. The starting power of the motor under the input power can avoid the failure of starting the motor and improve the control performance of the motor.
Description
technical field [0001] The invention relates to a motor driver, in particular to a weak power control circuit and method for a photovoltaic motor driver. Background technique [0002] At present, in the field of photovoltaic motor drive, the photovoltaic motor driver adjusts the output frequency, speed or torque of the driver according to the output power of the photovoltaic module. When the light is sufficient, the driver is adjusted by MPPT to make the driver work at the maximum power point of the module. When the driver is used to drive motor loads such as water pumps and air conditioner compressors, the minimum power to maintain the normal operation of the motor is relatively large; when the light is weak, since the output power of the photovoltaic modules is lower than the maintenance power of the motor load, the driver cannot perform MPPT normally. Adjust and stop the output, and the driven motor stops running. However, at this time, the photovoltaic modules can stil...
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IPC IPC(8): H02J3/38H02J7/35H02P27/06
CPCH02J3/385H02J7/345H02J7/35H02P27/06Y02E10/56
Inventor 孟庆辉方林曾耀
Owner 湖南科比特电气技术有限公司