Abstract: A transmission electron microscope includes a control unit that: determines an excitation amount of a second illumination system lens based on an excitation amount of first illumination system lens such that the second illumination system lens satisfies a first optical condition; and determines a control amount of a first deflector and a control amount of a second deflector based on the excitation amount of the second illumination system lens such that the first deflector and the second deflector satisfy a second optical condition. The first optical condition is for a convergence angle of the electron beam to be constant even if the excitation amount of the first illumination system lens has changed, and the second optical condition is for an illuminating position of the electron beam and an illuminating angle of the electron beam to be constant even if the excitation amount of the first illumination system lens has changed.

Abstract: A transmission electron microscope includes a control unit that: determines an excitation amount of a second illumination system lens based on an excitation amount of first illumination system lens such that the second illumination system lens satisfies a first optical condition; and determines a control amount of a first deflector and a control amount of a second deflector based on the excitation amount of the second illumination system lens such that the first deflector and the second deflector satisfy a second optical condition. The first optical condition is for a convergence angle of the electron beam to be constant even if the excitation amount of the first illumination system lens has changed, and the second optical condition is for an illuminating position of the electron beam and an illuminating angle of the electron beam to be constant even if the excitation amount of the first illumination system lens has changed.

Abstract: A synchronous rectification control circuit includes a first drive unit that outputs a signal for controlling turning on/off of a synchronous rectification element disposed on a secondary side, a second drive unit that performs control to make a voltage between both ends of the synchronous rectification element equal to a predetermined threshold voltage during a predetermined period during which a rectification current flows on the secondary side, and a drive switching unit that selectively supplies an output from the first drive unit and an output from the second drive unit to the synchronous rectification element.

Abstract: A synchronous rectification control circuit includes: a first drive unit that outputs a signal for controlling turning on/off of a synchronous rectification element disposed on a secondary side; a second drive unit that performs control to make a voltage between both ends of the synchronous rectification element equal to a predetermined threshold voltage during a predetermined period during which a rectification current flows on the secondary side; and a drive switching unit that selectively supplies an output from the first drive unit and an output from the second drive unit to the synchronous rectification element.

Abstract: To enhance stability of an output from a power supply circuit. A power supply circuit includes: a switching element pair (10A, 10B) having a high-side switching element (Q1, Q3), and a low-side switching element (Q2, Q4) connected in series with the high-side switching element; and a control section (2) complementarily driving the respective switching elements configuring the switching element pair, in which the control section (2) controls ON/OFF of the respective switching elements in such a way that a switching duty of the high-side switching element and the low-side switching element in a first period of time (steady-state operation), and a switching duty of the high-side switching element and the low-side switching element in a second period of time (Q1 drive voltage maintaining operation) are different from each other.

Abstract: A power supply circuit includes: a first switching element pair having a high-side first switching element and a low-side second switching element; a second switching element pair having a high-side third switching element and a low-side fourth switching element; and a control section complementarily driving the respective switching elements in the first and second switching element pairs, in which the control section sets a buck-boost ratio in a third operation mode in such a way that a buck-boost ratio in a first operation mode and a buck-boost ratio in a second operation mode continuously change, and sets a switching duty of the first switching element pair and a switching duty of the second switching element pair on the basis of the buck-boost ratio in the third operation mode.

Abstract: A light emitting element drive device includes: a light emitting section having a light emitting element; output capacitance capable of storing power supplied to the light emitting section; a driver connected between the light emitting section and a reference potential and including a switch section whose conductive state is controlled by a pulse-like lighting signal depending on magnitude of a load current and a constant current source section connected in series to the switch section; and a power supply controller being a power supply that provides drive power to the light emitting section and including a function to adjust an output current supplied to the output capacitance. The power supply controller changes the supply amount of the output current for the light emitting section from the power supply controller based on load current information that is necessary peak power of the light emitting section.

Abstract: A light emitting element drive device includes: a light emitting section having a light emitting element; output capacitance capable of storing power supplied to the light emitting section; a driver connected between the light emitting section and a reference potential and including a switch section whose conductive state is controlled by a pulse-like lighting signal depending on magnitude of a load current and a constant current source section connected in series to the switch section; and a power supply controller being a power supply that provides drive power to the light emitting section and including a function to adjust an output current supplied to the output capacitance. The power supply controller changes the supply amount of the output current for the light emitting section from the power supply controller based on load current information that is necessary peak power of the light emitting section.

Abstract: A light emitting diode driving apparatus includes: a switching converter having an inductor and a switching device; a plurality of serial light emitting diode lines each having a plurality of light emitting diodes connected in series; a plurality of rectifier diodes respectively connected in series to the plurality of serial light emitting diode lines; a plurality of capacitors respectively connected to nodes between the serial light emitting diode lines and the rectifier diodes for smoothing a voltage; and one or more current distribution coils disposed between the switching converter and the plurality of serial light emitting diode lines to let a current flow in a direction of canceling out a magnetic flux generated by a first winding and a magnetic flux generated by a second winding each other, thereby making currents flowing in the serial light emitting diode lines equal to each other.

Abstract: A light emitting diode (LED) driving apparatus includes a drive section for driving an LED to emit light, and a control section that controls a driving current supplied from the drive section to the LED. The control section implements luminous power control by controlling an ON/OFF ratio of the driving current if a target value of luminous power of the LED is smaller than a predetermined value. The control section implements luminous power control by controlling a level of the driving current if the target value is equal to or larger than the predetermined value.

Abstract: A liquid crystal display apparatus is capable of reducing a power loss incurred by a power-supply section in a process of generating a power-supply voltage for driving a backlight section. In the configuration of the power-supply section, a main power-supply circuit and an inverter circuit (or a DC-DC converter) are connected to an input-voltage generation unit in parallel to each other, which is used for rectifying and smoothing the commercial alternative current power. The main power-supply circuit and the inverter circuit (or the DC-DC converter) each include an isolation transformer including a primary-side winding not isolated from the commercial alternative current power and a secondary winding provided on the secondary side. The direct current input voltage is supplied to the primary side to be subjected to a power conversion process to generate an output voltage on the secondary side of the isolation transformer.

Abstract: A light emitting diode driving apparatus includes: a switching converter having an inductor and a switching device; a plurality of serial light emitting diode lines each having a plurality of light emitting diodes connected in series; a plurality of rectifier diodes respectively connected in series to the plurality of serial light emitting diode lines; a plurality of capacitors respectively connected to nodes between the serial light emitting diode lines and the rectifier diodes for smoothing a voltage; and one or more current distribution coils disposed between the switching converter and the plurality of serial light emitting diode lines to let a current flow in a direction of canceling out a magnetic flux generated by a first winding and a magnetic flux generated by a second winding each other, thereby making currents flowing in the serial light emitting diode lines equal to each other.

Abstract: In order to suppress leak current at the time of high voltage application to a fluorescent lamp so as to improve the luminous efficiency, the present invention provides a fluorescent lamp driver, which includes switching means that switches a DC power supply voltage, and a first transformer and a second transformer configured to obtain AC voltages each having reverse polarity, as AC voltages excited from primary winding to secondary winding of the respective transformers, on the basis of output voltages of the switching means, in which the first transformer and the second transformer are positioned in the vicinity of both ends of the fluorescent lamp, and the AC voltage obtained in the secondary winding of the first transformer is applied to one terminal of the fluorescent lamp and the AC voltage obtained in the secondary winding of the second transformer is applied to the other terminal of the fluorescent lamp.

Abstract: A light emitting element drive circuit and a display system able to simultaneously perform constant current control and PWM control and able to perform a stable adjustment of luminance over a wide dynamic range, including a constant voltage source having an output voltage adjustment unit able to be changed in output voltage according to a signal from the outside, a switch circuit connected to the cathode side of the LED and ON/OFF controlled in accordance with a PWM signal from the outside, a current detection unit for detecting the current flowing in the circuit, and a sample and hold circuit for maintaining the current input value from the current detection unit for a constant period, and the output voltage adjustment unit receives as input the output of the sample and hold circuit, that is, the current value when the switch circuit is ON, and adjusts the output of the constant voltage source so that this value becomes a previously determined set value, to thereby make the current flowing in the LED constan

Abstract: A discharge tube lighting apparatus is used to drive a plurality of discharge tubes. The apparatus includes a balance coil having a winding input end and a plurality of winding output ends to which the discharge tubes are connected individually; a power section for supplying ac current to the winding input end of the balance coil; and a control section for detecting a peak value of detection voltages corresponding to voltages at the winding output ends of the balance coil and for stopping the supply of the ac current from the power section when the peak value of the detection voltages is higher than a predetermined value.

Abstract: An AC plug provided with a plug casing and prongs formed sticking out from the inside of the plug casing to the outside and supplying AC power supplied from a power outlet to the prongs by an AC cord connected to the prongs inside the plug when the prongs are inserted into the power outlet, further provided with, inside the plug casing in series between the prongs, a discharge resistor for discharging a residual charge across the prongs when the prongs are pulled out from the power outlet and a switch turning off when the prongs are inserted into the power outlet, turning on when they are pulled out from the power outlet to pass the residual charge of one prong of the prongs to the other prong through the discharge resistor.

Abstract: A discharge tube lighting apparatus is used to drive a plurality of discharge tubes. The apparatus includes a balance coil having a winding input end and a plurality of winding output ends to which the discharge tubes are connected individually; a power section for supplying ac current to the winding input end of the balance coil; and a control section for detecting a peak value of detection voltages corresponding to voltages at the winding output ends of the balance coil and for stopping the supply of the ac current from the power section when the peak value of the detection voltages is higher than a predetermined value.

Abstract: A liquid crystal display apparatus is capable of reducing a power loss incurred by a power-supply section in a process of generating a power-supply voltage for driving a backlight section. In the configuration of the power-supply section, a main power-supply circuit and an inverter circuit (or a DC-DC converter) are connected to an input-voltage generation unit in parallel to each other, which is used for rectifying and smoothing the commercial alternative current power. The main power-supply circuit and the inverter circuit (or the DC-DC converter) each include an isolation transformer including a primary-side winding not isolated from the commercial alternative current power and a secondary winding provided on the secondary side. The direct current input voltage is supplied to the primary side to be subjected to a power conversion process to generate an output voltage on the secondary side of the isolation transformer.

Abstract: A liquid crystal display apparatus is capable of reducing a power loss incurred by a power-supply section in a process of generating a power-supply voltage for driving a backlight section. In the configuration of the power-supply section, a main power-supply circuit and an inverter circuit (or a DC-DC converter) are connected to an input-voltage generation unit in parallel to each other, which is used for rectifying and smoothing the commercial alternative current power. The main power-supply circuit and the inverter circuit (or the DC-DC converter) each include an isolation transformer including a primary-side winding not isolated from the commercial alternative current power and a secondary winding provided on the secondary side. The direct current input voltage is supplied to the primary side to be subjected to a power conversion process to generate an output voltage on the secondary side of the isolation transformer.

Abstract: A liquid crystal display apparatus is capable of reducing a power loss incurred by a power-supply section in a process of generating a power-supply voltage for driving a backlight section. In the configuration of the power-supply section, a main power-supply circuit and an inverter circuit (or a DC-DC converter) are connected to an input-voltage generation unit in parallel to each other, which is used for rectifying and smoothing the commercial alternative current power. The main power-supply circuit and the inverter circuit (or the DC-DC converter) each include an isolation transformer including a primary-side winding not isolated from the commercial alternative current power and a secondary winding provided on the secondary side. The direct current input voltage is supplied to the primary side to be subjected to a power conversion process to generate an output voltage on the secondary side of the isolation transformer.