TWI390819B - Charging device for wind driven generator - Google Patents

Description

Charging device for wind power generator

The invention relates to a charging device for a wind power generator, in particular to a charging operation mode designed according to the characteristics of a wind power generator, in particular to a person who can adjust the operating frequency for the load to assist the charging circuit to change the current mode.

Generally, the step-down circuit for wind turbines uses voltage regulation control, as shown in Figure 3, but the continuous conduction method of constant voltage makes the ions have no extra time to evenly distribute to the entire battery, so the purpose of fast charging cannot be achieved. And this method also causes the initial charging current to be too large, causing the temperature to rise and thus the problem of shortening the battery life. Due to wind power generation, wind speed is not a stable system input, and the output voltage of the generator is also affect the wind speed, so the conventional step-down circuit, even if the wind speed is too fast, its input voltage V _in charging circuit 6 remains a The fixed charging voltage charges the battery 7, so that the increased power of the generator is wasted when the wind speed is large. In this regard, if you want to accurately use the different wind speeds for charging control, you need complex digital control. However, this is too high for the application cost of small fans. Therefore, the general practitioners cannot meet the needs of the user in actual use.

SUMMARY OF THE INVENTION The primary object of the present invention is to overcome the above problems encountered in the prior art and to provide a design for adjusting the operating frequency for a load to assist the charging circuit in changing the current mode in accordance with the characteristics of the wind turbine.

The main object of the present invention is to provide a method in which the charging circuit is designed to operate in continuous and discontinuous conduction modes except for the wind speed, and to control the charging circuit to enter the constant voltage charging mode when the rechargeable battery is near saturation.

Another object of the present invention is to provide a person who can effectively utilize the power of a wind power generator while also effectively reducing the application cost.

For the purpose of the above, the present invention is a charging device for a wind power generator, comprising: a wind generator coupled to a fan, a rectifier coupled to the wind power generator, a rechargeable battery, and a coupling of the rectifier And a charging circuit between the rechargeable battery and a charging controller coupled to the rectifier and the rechargeable battery. The invention mainly uses the charging controller to estimate the wind speed according to the DC power of the rectifier, and monitors the charging state of the rechargeable battery at any time, and evaluates whether the rechargeable battery is close to saturation according to the voltage of the charging state, thereby controlling the charging circuit from at least In a continuous conduction mode (CCM) and a discontinuous conduction mode (DCM), a step-down circuit operation mode or a constant voltage discharge regulation (CV) is selected for the charging. The battery performs charging, where:

When the wind speed is small, the charging circuit is controlled to enter a continuous conduction mode in the working mode of the step-down circuit, for charging the rechargeable battery with a small continuous current; when the wind speed is large, controlling the charging circuit to enter the step-down circuit a discontinuous conduction mode in the operating mode for charging the rechargeable battery with a discontinuous current; and when the rechargeable battery is near saturation, controlling the switch module and applying the capacitor to cause the charging circuit to enter a constant voltage charging mode, Used to set the voltage and current to charge the rechargeable battery.

Please refer to FIG. 1 and FIG. 2 for a schematic diagram of the architecture of the present invention and a schematic diagram of the charging mode of the present invention. As shown in the figure, the present invention relates to a charging device for a wind power generator, which comprises at least a wind power generator 1, a rectifier 2, a rechargeable battery 3, a charging circuit 4 and a charging controller 5.

The wind generator 1 is coupled to a fan 11 for converting energy generated when the fan 11 rotates into an alternating current power.

The rectifier 2 is coupled to the wind power generator 1 for converting the AC power generated by the wind power generator 1 into a DC power.

The rechargeable battery 3 is used to store the DC power.

The charging circuit 4 is coupled between the rectifier 2 and the rechargeable battery 3, and has a switch module, an inductor L and a capacitor C for receiving the DC power converted by the rectifier 2 and the rechargeable battery. 3, charging, wherein the switch module is a metal oxide half field effect transistor (MOSFET) component, comprising a first switching element Q ₁ and a second switching element Q ₂ , and the inductor L and the capacitor C are connected Between the first switching element Q ₁ and the second switching element Q ₂ .

The charging controller 5 is coupled to the rectifier 2 and the rechargeable battery 3 for estimating the wind speed according to the DC power of the rectifier 2, and monitoring the charging state of the rechargeable battery 3 at any time, and evaluating the charging according to the voltage of the charging state thereof. Whether the battery 3 is nearly saturated, thereby controlling the charging circuit 4 to select a step-down circuit operation mode 41 from at least one continuous conduction mode (CCM) 411 and a discontinuous conduction mode (DCM) 412 or Further, the rechargeable battery 3 is charged in a constant voltage discharge regulation (CV) 42 (as shown in FIG. 2).

The step-down circuit operation mode 41 can be determined as continuous or discontinuous according to the current mode on the inductor L, and can be derived from the following conditions when operating in the discontinuous conduction mode 412:

Wherein, assuming that the frequency fs, the inductance L and the load R are fixed, the conduction rate D will determine the inductor current mode, and the conduction rate is related to the input and output voltage. When the input voltage increases, the conduction rate decreases, and the charging circuit 4 easily enters the discontinuity. The conduction mode 412 is charged with a large discontinuous current, and the current mode on the inductor generates discontinuous conduction and is less than or equal to a minimum value ( ). Conversely, when the input voltage decreases, the conduction rate increases, and the charging circuit 4 easily enters the continuous conduction mode 411 to charge with a small continuous current. At this time, the current mode is continuously turned on and greater than a minimum value (L>L _min). In addition, the conduction rate can be compensated at the same time when the wind speed is large, the output power is increased, and the operating frequency is also adjusted for the load to assist the charging circuit 4 to change the current mode.

When the present invention is utilized, in a preferred embodiment, the charging circuit 4 is designed to operate in a continuous and discontinuous conduction mode by utilizing the characteristics of the wind power generator. When the wind speed is small, the charging circuit 4 is controlled to operate in the continuous mode. In the conduction mode 411, the rechargeable battery 3 is charged with a small continuous current because the power that can be extracted is small; when the wind speed reaches a large rated value and can draw a large power, the charging circuit 4 is controlled to operate due to the voltage rise. In the discontinuous conduction mode 412, the rechargeable battery 3 is charged with a discontinuous current to provide a rest time, so that ions can be more evenly distributed to the entire rechargeable battery 3 for fast charging. When the rechargeable battery 3 is nearly saturated, the switch module is controlled and the capacitor C is applied to operate the charging circuit 4 in the constant voltage charging mode 42 for charging the rechargeable battery 3 in a precise manner. .

In summary, the present invention is a charging device for a wind power generator, which can effectively improve various disadvantages of the conventional use, and the charging circuit is designed to operate in a continuous and discontinuous conduction mode, and is controlled when the rechargeable battery is near saturation. The charging circuit enters a constant voltage charging mode, and the working frequency can be adjusted for the load to assist the charging circuit to change the current mode, thereby effectively utilizing the power of the wind power generator and effectively reducing the application cost, thereby further improving the generation of the present invention. More practical and more in line with the needs of the user, it has indeed met the requirements of the invention patent application, and filed a patent application according to law.

However, the above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto; therefore, the simple equivalent changes and modifications made in accordance with the scope of the present invention and the contents of the invention are modified. All should remain within the scope of the invention patent.

(part of the invention)

1. . . Wind Turbines

11. . . fan

2. . . Rectifier

3. . . Rechargeable Battery

4. . . Charging circuit

41. . . Buck circuit working mode

411. . . Continuous conduction mode

412. . . Discontinuous conduction mode

42. . . Constant voltage charging mode

5. . . Charge controller

C. . . capacitance

L. . . inductance

Q ₁ . . . First switching element

Q ₂ . . . Second switching element

(customized part)

6. . . Charging circuit

7. . . battery

Figure 1 is a schematic diagram of the architecture of the present invention.

Figure 2 is a schematic diagram of the charging mode of the present invention.

Figure 3 is a schematic diagram of a conventional step-down circuit.

1. . . Wind Turbines

11. . . fan

2. . . Rectifier

3. . . Rechargeable Battery

4. . . Charging circuit

5. . . Charge controller

C. . . capacitance

L. . . inductance

Q ₁ . . . First switching element

Q ₂ . . . Second switching element

Claims (4)

A charging device for a wind power generator includes: a wind power generator coupled to a fan for converting energy generated when the fan is rotated into an alternating current electric energy; and a rectifier coupled to the wind power generator The electric energy generated by the wind power generator is converted into a direct current electric energy; a rechargeable battery is used to store the direct current electric energy; a charging circuit is coupled between the rectifier and the rechargeable battery, and has a switch therein The module, an inductor, and a capacitor are configured to receive the DC power converted by the rectifier and charge the rechargeable battery, wherein the switch module includes a first switching component and a second switching component, and the inductor And the capacitor is connected between the first switching element and the second switching element; a charging controller is coupled to the rectifier and the rechargeable battery for estimating the wind speed according to the DC power of the rectifier, and monitoring at any time Charging state of the rechargeable battery, evaluating whether the rechargeable battery is near saturation according to a voltage of its charging state, thereby controlling the charging circuit from at least one In the continuous conduction mode (CCM) and a discontinuous conduction mode (DCM), a step-down circuit operation mode or a constant voltage discharge regulation (CV) is selected as the rechargeable battery. Performing charging, wherein: when the wind speed is small, controlling the charging circuit to enter a continuous conduction mode in the working mode of the step-down circuit, for charging the rechargeable battery with a small continuous current; when the wind speed is large, controlling the charging circuit Entering the discontinuous conduction mode in the operating mode of the step-down circuit, for charging the rechargeable battery with a discontinuous current And when the rechargeable battery is near saturation, controlling the switch module and applying the capacitor to cause the charging circuit to enter a constant voltage charging mode for charging the rechargeable battery with a voltage and current. The charging device for a wind power generator according to claim 1, wherein the continuous conduction mode in the operating mode of the step-down circuit is that when the current mode on the inductor is continuously turned on and greater than a minimum value (L) >L _min ). The charging device for a wind power generator according to claim 1, wherein the discontinuous conduction mode in the operating mode of the step-down circuit is when the current mode on the inductor generates discontinuous conduction and is less than or equal to a minimum Value (L L _min ). The charging device for a wind power generator according to claim 1, wherein the switch module is a metal oxide half field effect transistor (MOSFET) component.