摘要:
A heater control device having at least two PTC heaters having PTC elements includes switching units which are provided so as to correspond to the PTC heaters and which switch an energized state and a non-energized state of the PTC elements by being turned ON and OFF, pattern information which defines state combination patterns of the energized state and the non-energized state of the PTC elements with respect to a required power value for the heater unit, and a ratio controlling unit which when the required power for the heater unit is at an intermediate value of the required power values defined in the pattern information, controls a ratio of the energized state to the non-energized state of the PTC elements based on a ratio of ON time to OFF time for which an average power within a certain period matches the required power.
摘要:
A heater control device having at least two PTC heaters having PTC elements includes switching units which are provided so as to correspond to the PTC heaters and which switch an energized state and a non-energized state of the PTC elements by being turned ON and OFF, pattern information which defines state combination patterns of the energized state and the non-energized state of the PTC elements with respect to a required power value for the heater unit, and a ratio controlling unit which when the required power for the heater unit is at an intermediate value of the required power values defined in the pattern information, controls a ratio of the energized state to the non-energized state of the PTC elements based on a ratio of ON time to OFF time for which an average power within a certain period matches the required power.
摘要:
A simple, low cost drive circuit secures a sufficient number of subfields in a high resolution panel. The plasma display panel drive circuit groups plural sustain electrodes into first and second sustain electrode groups, and applies sustain pulses in the sustain period. The first and second sustain pulse generating circuits generate and apply sustain pulses to first and second electrode paths. First and second specific voltage application circuits apply a first specific voltage to the first and second electrode paths. The voltage selection circuit selects one of a plurality of voltages including at least a second specific voltage and a third specific voltage, and generates a selected voltage. The first and second sustain pulse generating circuits generate the sustain pulses based on the second specific voltage when the selected voltage is the second specific voltage, and when the selected voltage is the third specific voltage, apply the third specific voltage to the first and second electrode paths.
摘要:
An operating apparatus of a discharge lamp for operating the discharge lamp having an arc tube defining a discharge space includes: generation means for generating a first waveform signal having a frequency component of an acoustic resonance frequency exciting a mode which straightens an arc discharge, a center line of a waveform of the first waveform signal being maintained at a fixed level; and modulation means for modulating the first waveform signal periodically so that a polarity of the center line of the first waveform signal changes alternately at a modulation frequency which is lower than the acoustic resonance frequency, and generating a modulated signal. A modulation depth .alpha./.beta., where .alpha. is a peak-to-peak amplitude of the first waveform signal and .beta. is an effective value of an amplitude of the modulated signal, is set at such a value that a sealed material in the arc tube is prevented from adhering to a center portion of the arc tube in substantially a strip shape.
摘要:
Provided are: a heat medium heating device capable of bringing: flat heat exchange tubes and PTC heaters; and inlet/outlet header parts of the flat heat exchange tubes, into sufficiently close contact with each other, and incorporating these components into a casing; and a vehicular air-conditioning device including the same. In a heat medium heating device, flat heat exchange tubes each including a flat tube part and inlet/outlet header parts and PTC heaters are stacked in layers, and a heat exchange holding member presses the flat heat exchange tubes from one side, whereby the stacked structure is incorporated on an inner bottom surface of a casing. In this configuration, at least uppermost one of the flat heat exchange tubes has one surface pressed by the heat exchange holding member, the one surface being formed into a planar shape in which the flat tube part and the inlet/outlet header parts are flattened.
摘要:
An object of the present invention is to provide a small, lightweight, and inexpensive heat medium heating apparatus in which a flat tube heat exchanger and a PTC heater are laminated in a multi-layered manner to reduce a thermal contact resistance thereamong, heat transfer performance is improved, and also in which assembling of the flat tube heat exchanger and the PTC heater is made easier.
摘要:
The heating-medium heating unit is provided with a plurality of flat heat-exchange tubes (17) each having an inlet header (22) and an outlet header (23) at one end or both ends of flat tube portions (20) through which a heating medium is circulated; sealing materials (26) that seal the peripheries of communicating holes (24, 25) of the inlet headers (22) and the outlet headers (23) of the stacked flat heat-exchange tubes (17); PTC heaters assembled between the flat tube portions (20) of the flat heat-exchange tubes (17); and a heat-exchange pressing member (16) that presses the alternately stacked flat heat-exchange tubes (17) and PTC heaters into close contact with each other, wherein a deformation-preventing reinforcing portion (29) is provided around each of the communicating holes (24, 25) in the inlet header (22) and the outlet header (23) of each of the flat heat-exchange tubes (17).
摘要:
A method of driving a plasma display panel of the present invention, is a driving method of a display panel including plural display electrode pairs (24) each including a scan electrode (22) and a sustain electrode (23) extending along each other, plural data electrodes (32) crossing the plural display electrode pairs (24) and discharge cells respectively formed at positions where the display electrode pairs (24) and the data electrodes (32) cross each other. The method comprises applying a last sustain pulse to the scan electrode (22) in a sustain period when a sustain voltage pulse is applied alternately to the scan electrode (22) and to the sustain electrode (23); then applying to the scan electrode (22) a first ramp voltage having a first ramp waveform which is opposite in polarity to the last sustain voltage pulse; and applying to the sustain electrode (23) a second ramp voltage having a second ramp waveform which is opposite in polarity to the first ramp voltage such that before one of the first and second ramp waveforms reaches a predetermined voltage and finishes rising, the other of the first and second ramp waveforms starts rising.
摘要:
Provided are a damper in which strange sound (whistling sound) generated when the damper has a small opening degree is suppressed, an air conditioning unit, and an air conditioner for vehicle. The damper has a wall surface (33) for forming a channel for allowing air to flow in it, a stationary portion (35) extending from the wall surface (33) toward the center of the channel (23), and a rotation portion (25) rotatably placed in the channel (23) and having one end (29) in contact with a portion of the stationary portion (35), which portion is on the downstream side of air flow in the channel (23). A curved wall portion (45) curved and projected toward the center of the channel (23) is formed at that position on the wall surface (33) with which the air flow passed between one end (29) and the stationary portion (35) collides.
摘要:
The present invention discloses an operating apparatus of discharge lamp comprising an AC/DC converter means for converting an ac voltage into a dc voltage, a DC/AC converter means for converting a dc output voltage of the AC/DC converter means into a high frequency ac voltage, a discharge lamp coupled to an output terminal of the DC/AC converter means, and a controller means by which the output of the DC/AC converter means is made variable according to an integrated value based on a half cycle of the ac voltage.