Abstract: A high performance linear driving circuit converting an AC voltage of an external power supply into a DC output current and then outputs the DC current to at least one LED includes a detection unit, a control unit and a current unit. In a 180-degree phase sine wave period of the AC voltage, the total current of the output current is formed by a first working section, an energy saving section and a second working section, and the detection unit detects at least a voltage value of the AC voltage or a current value of the output current to generate a detection signal, and drives the control unit to modulate the duty cycle and current value of the first working section, energy saving section and second working section, and the amounts of current of the first and second working sections are greater than that of the energy saving section.

Abstract: A self-excited power conversion circuit for secondary side control output power includes a comparator unit and a transistor installed directly in a secondary side output module, and the comparator unit is electrically coupled to at least one load, and the transistor is electrically coupled between to a conversion module of the circuit and the load. The comparator unit is provided for adjusting the duty cycle of the transistor after detecting the amount of energy outputted from the conversion module to the load from, so as to adjust the amount of energy actually received by the load to achieve a constant power effect.

Abstract: A power circuit with a low total harmonic distortion includes a conversion module and a control module, and the conversion module includes a first switch, a second switch, a power storage element and a conversion element. Both ends of the power storage element are electrically connected to the first switch, the second switch and the conversion element. Trigger ends of the first and second switches are electrically connected to the control module. If the input voltage is smaller than a predetermined value, the control module will output a control pulse to the second switch, and the second switch will conduct and drive the power storage element to boost the input voltage to generate a compensating current in a timing cycle, and the second switch will cut off and allow the compensating current to be converted into a voltage form by the conversion element and outputted in another timing cycle.

Abstract: An optimal battery charging method and circuit for automatically regulating an output current to an energy storage load includes the steps of using a first-status current and a second-status current of the output current to obtain the energy storage load, analyzing the second-status voltage and the first-status voltage to obtain an equivalent resistance parameter of the energy storage load, and using the equivalent resistance parameter to compute a charging power loss of the energy storage load to regulate an output cycle of the output current, so that the energy storage load can be charged at constant temperature to achieve the effect of high charging efficiency.

Abstract: A self-excited power conversion circuit for secondary side control output power includes a comparator unit and a transistor installed directly in a secondary side output module, and the comparator unit is electrically coupled to at least one load, and the transistor is electrically coupled between to a conversion module of the circuit and the load. The comparator unit is provided for adjusting the duty cycle of the transistor after detecting the amount of energy outputted from the conversion module to the load from, so as to adjust the amount of energy actually received by the load to achieve a constant power effect.

Abstract: An LED element with a color light enhancement function is a two-terminal element for receiving a driving current to emit light and includes at least one blue LED chip, at least one red LED chip and a three-way compensator. The three-way compensator intercepts a driving current passing through the blue LED chip depending on a proportion value according to a change of working temperature and adjusts the amount of current flowing into the red LED chip. If the working temperature exceeds a default value, an input terminal of the three-way compensator is triggered to intercept the driving current and generate and output a set current to the red LED chip to compensate an attenuation of the red LED chip caused by high temperature. The LED element will not be changed its intensity after a prolonged period of usage.

Abstract: Disclosed is a multi-segment LED driving circuit used in an AC operating mode for outputting a drive current to drive a plurality of serially connected LED strings. The LED driving circuit includes at least one detection part, at least one comparison part and at least one adjusting part. The detection part detects an input voltage and an output voltage at both ends of each string and its next string to form a detected value provided for the comparison part to compare the detected value with a reference value to turn on or off the adjusting part so as to control the strings through which the drive current passes and then sequentially drives the strings to emit light. The LED driving circuit can adjust the load of the circuit immediately based on the change of voltage value of the AC power to ensure the stability of the drive current.

Abstract: Disclosed is a multi-segment LED driving circuit used in an AC operating mode for outputting a drive current to drive a plurality of serially connected LED strings. The LED driving circuit includes at least one detection part, at least one comparison part and at least one adjusting part. The detection part detects an input voltage and an output voltage at both ends of each string and its next string to form a detected value provided for the comparison part to compare the detected value with a reference value to turn on or off the adjusting part so as to control the strings through which the drive current passes and then sequentially drives the strings to emit light. The LED driving circuit can adjust the load of the circuit immediately based on the change of voltage value of the AC power to ensure the stability of the drive current.

Abstract: Disclosed is an electromagnetic coupling multi-output control circuit having a detection unit, a switching unit and a coupling unit, and the coupling unit is coupled to a side of a transformer of a power driving device to sense and produce a second driving voltage, such that the transformer has a multi-output function. The switching unit is provided for receiving and outputting the second driving voltage to a second driving load, and the detection unit is provided for detecting the second driving voltage to produce a detection value, so that the switching unit analyzes the detection value and switches outputting a frequency of the second driving voltage to stabilize the voltage value of the second driving voltage, so as to flexibly increase the number of output voltages of the power driving device while lowering the cost and expand the scope of applicability.

Abstract: Disclosed is an electromagnetic coupling multi-output control circuit having a detection unit, a switching unit and a coupling unit, and the coupling unit is coupled to a side of a transformer of a power driving device to sense and produce a second driving voltage, such that the transformer has a multi-output function. The switching unit is provided for receiving and outputting the second driving voltage to a second driving load, and the detection unit is provided for detecting the second driving voltage to produce a detection value, so that the switching unit analyzes the detection value and switches outputting a frequency of the second driving voltage to stabilize the voltage value of the second driving voltage, so as to flexibly increase the number of output voltages of the power driving device while lowering the cost and expand the scope of applicability.

Abstract: A desk board raising apparatus has a seat, an active module, a passive module, and a cylinder. The active module is pivotally mounted in the seat and has a base, two linking arms, and a pivot. The linking arms are L-shaped. The pivot is deposited between the linking arms and pivotally mounted in the seat. The passive module is mounted in the seat and has a passive board pivotally connected with the linking arms. The cylinder is mounted in the seat and is adapted to push the passive board. Thus, the base lifted up or down can drive the passive board to move up or down. Therefore, the desk board raising apparatus uses a simple structure to synchronize the movements of the passive board and the base, and therefore has the advantages of convenient operation, low manufacturing cost, low maintenance cost, and consuming no power.