A multi-level voltage regulator system/method providing discrete regulation of a DC-DC intermediate bus converter (IBC) output voltage (Vout) is disclosed. The disclosed system/method allows IBC Vout to be regulated in discrete steps during periods where IBC input voltage (Vin) falls below nominal operating values. Rather than shutting down or degrading IBC Vout in an unpredictable non-linear fashion based on IBC input/loading, IBC Vout is regulated in fixed discrete steps, allowing IBC-connected point-of-load (POL) converters to obtain stable power input that is well-defined over IBC Vin. IBC operating parameters may define multi-dimensional operational state spaces of IBC Vout regulation that ensure optimum power flow to attached POLs while maintaining operational stability within the IBC regulator. Instabilities in IBC/POL performance across variations in IBC Vin, load transients, POL loading, and environmental variables may be prevented using Vin voltage step hysteresis.

The present invention provides a DC voltage conversion circuit, a DC voltage conversion method, and a liquid crystal display device. The DC voltage conversion circuit comprises a first diode, a second diode, a third diode, a fourth diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a voltage dividing unit, and a switching unit. The second terminal of the first capacitor is connected with the first voltage-transforming signal and the second terminal of the third capacitor is connected with the second voltage-transforming signal. The first and second voltage-transforming signals are both pulse signals, and the first and second voltage-transforming signals have opposite phases. Comparing the present invention and the conventional art, the present invention can quickly complete the transformation of the input voltage, to reduce the require time for completing the voltage transformation, which has strong driving capability and fast response speed.

The present invention provides a DC voltage conversion circuit, a DC voltage conversion method, and a liquid crystal display device. The DC voltage conversion circuit comprises a first diode, a second diode, a third diode, a fourth diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a voltage dividing unit, and a switching unit. The second terminal of the first capacitor is connected with the first voltage-transforming signal and the second terminal of the third capacitor is connected with the second voltage-transforming signal. The first and second voltage-transforming signals are both pulse signals, and the first and second voltage-transforming signals have opposite phases. Comparing the present invention and the conventional art, the present invention can quickly complete the transformation of the input voltage, to reduce the require time for completing the voltage transformation, which has strong driving capability and fast response speed.

A detector detects a peak of a power value in a current-voltage characteristic curve to DC power output from a solar battery module. A setting device, when a plurality of peaks is detected, when a current value is greater than a threshold value in a first peak having a maximum voltage value of the plurality of peaks, sets an operation point based on the first peak. The setting device, when the current value in the first peak is equal to or less than the threshold value, sets the operation point based on a second peak in which the voltage value is less than that in the first peak and the current value is greater than the threshold value, of the plurality of peaks. A power regulator regulates output of the DC power of the solar battery module in accordance with the operation point set.

A detector detects a peak of a power value in a current-voltage characteristic curve to DC power output from a solar battery module. A setting device, when a plurality of peaks is detected, when a current value is greater than a threshold value in a first peak having a maximum voltage value of the plurality of peaks, sets an operation point based on the first peak. The setting device, when the current value in the first peak is equal to or less than the threshold value, sets the operation point based on a second peak in which the voltage value is less than that in the first peak and the current value is greater than the threshold value, of the plurality of peaks. A power regulator regulates output of the DC power of the solar battery module in accordance with the operation point set.

The inventive technology, in certain embodiments, may be generally described as a solar power generation system with a converter, which may potentially include two or more sub-converters, established intermediately of one or more strings of solar panels. Particular embodiments may involve sweet spot operation in order to achieve improvements in efficiency, and bucking of open circuit voltages by the converter in order that more panels may be placed on an individual string or substring, reducing the number of strings required for a given design, and achieving overall system and array manufacture savings.

The inventive technology, in certain embodiments, may be generally described as a solar power generation system with a converter, which may potentially include two or more sub-converters, established intermediately of one or more strings of solar panels. Particular embodiments may involve sweet spot operation in order to achieve improvements in efficiency, and bucking of open circuit voltages by the converter in order that more panels may be placed on an individual string or substring, reducing the number of strings required for a given design, and achieving overall system and array manufacture savings.

A booster circuit includes, at a substrate end of an insulating substrate, an input part of voltage, an output part of voltage, and a conductive L-shaped joint fitting. The L-shaped joint fitting includes a plate-shaped bottom surface portion attached to the insulating substrate and a plate-shaped back surface portion bent from the bottom surface portion and extending in a specific direction. In the input part and the output part, a capacitor, a diode, and a connection line connecting the insulating substrates are electrically connected at a component connecting portion, and the L-shaped joint fitting is disposed such that a lead forming portion of a lead connected to the capacitor, a lead forming portion of a lead connected to the diode, and the component connecting portion fit within an area of a main surface of the back surface portion and an area of a main surface of the bottom surface portion.

A booster circuit includes, at a substrate end of an insulating substrate, an input part of voltage, an output part of voltage, and a conductive L-shaped joint fitting. The L-shaped joint fitting includes a plate-shaped bottom surface portion attached to the insulating substrate and a plate-shaped back surface portion bent from the bottom surface portion and extending in a specific direction. In the input part and the output part, a capacitor, a diode, and a connection line connecting the insulating substrates are electrically connected at a component connecting portion, and the L-shaped joint fitting is disposed such that a lead forming portion of a lead connected to the capacitor, a lead forming portion of a lead connected to the diode, and the component connecting portion fit within an area of a main surface of the back surface portion and an area of a main surface of the bottom surface portion.

The present invention discloses a constant-current charging circuit, energy storage power source and constant-current charging method. The constant-current charging circuit includes a DC-DC converting circuit and a current-feedback circuit. A voltage output of the DC-DC converting circuit is a positive output of the constant-current charging circuit. A negative output of the DC-DC converting circuit is connected to a ground. The DC-DC converting circuit is connected to positive and negative terminals for a direct current voltage power supply. The current-feedback circuit includes first to third resistors and a reference voltage terminal. The reference voltage terminal is connected to the ground via the first to third resistors being connected in series. A connection point between the third resistor and the second resistor is a negative output of the constant-current charging circuit. A connection point between the first and second resistors is connected with a feedback terminal of the DC-DC converting circuit.