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 heater control device includes a current calculating unit (20) which calculates a third value of current based on a first value of current flowing through a first PTC element of a first PTC heater which is in an energized state and a second value of current estimated to flow through a second PTC element of a second PTC heater which is to be newly put into an energized state next, and a switching control unit (21) which maintains a non-energized state of the second PTC element of the second PTC heater until it is determined that the third value of current calculated by the current calculating unit (20) is less than a predetermined maximum allowable value of current and puts the second PTC element of the second PTC heater into an energized state when the third value of current is less than the predetermined maximum allowable value of current.
摘要:
A heater control device includes a current calculating unit (20) which calculates a third value of current based on a first value of current flowing through a first PTC element of a first PTC heater which is in an energized state and a second value of current estimated to flow through a second PTC element of a second PTC heater which is to be newly put into an energized state next, and a switching control unit (21) which maintains a non-energized state of the second PTC element of the second PTC heater until it is determined that the third value of current calculated by the current calculating unit (20) is less than a predetermined maximum allowable value of current and puts the second PTC element of the second PTC heater into an energized state when the third value of current is less than the predetermined maximum allowable value of current.
摘要:
Provided is a heat medium heating apparatus including: a plurality of flat heat exchanger tubes 12; PTC heaters 13 that are respectively incorporated between flat tube parts of the flat heat exchanger tubes 12; a heat exchanger holding member 15 that press-fixes the flat heat exchanger tubes 12 and the PTC heaters 13, from one side of the flat heat exchanger tubes 12 to an inner surface of a casing 11; and a control board 17 that has a surface on which a control circuit 21 is mounted, the control circuit 21 including heat-generating electrical components 20 that control the PTC heaters 13, in which the control board 17 includes heat penetration parts that are formed so as to pass through the control board 17 correspondingly to mounting positions of the heat-generating electrical components 20, and the heat-generating electrical components 20 are mounted so as to be cooled via the heat penetration parts.
摘要:
An object is to provide a heat medium heating device capable of achieving closer contact between cooling plates without an increase in size thereof, and a vehicle air conditioning apparatus provided with the heat medium heating device. The heat medium heating device includes: electrode plates that are respectively stacked on at least both sides of a PTC element so as to sandwich the PTC element; a plurality of flat heat exchanger tubes (17) each including: an inlet header part (22) that supplies a heat medium; an outlet header part (23) that discharges the heat medium; and a hermetic member provided in each of the inlet header part (22) and the outlet header part (23), the heat exchanger tubes (17) being stacked so as to be parallel to each other with the electrode plates being sandwiched therebetween and exchanging heat with the electrode plates; a substrate that is provided on one side of the plurality of the stacked heat exchanger tubes (17) and is connected to the electrode plates; a heat generating element connected to the substrate; a plate-shaped pressing member (16) that is connected to another side of the substrate and presses the plurality of the stacked heat exchanger tubes (17); and a casing (11) that houses the electrode plates, the heat exchanger tubes (17), the substrate, the pressing member (16), and the heat generating element.
摘要:
An electrode-less discharge lamp lighting apparatus which is electrically connected to a dimming unit (2) is provided with: an electrode-less fluorescent lamp (3); and a lighting circuit (4) operable to apply a high-frequency voltage to the electrode-less fluorescent lamp (3), wherein the lighting circuit (4) includes: an AC/DC converting unit (5) operable to convert a phase-controlled AC voltage outputted from the dimming unit (2) into a DC voltage; a DC/AC converting unit (6) operable to convert the DC voltage into a high-frequency voltage; and a dimming controlling unit (7) that includes a resistor (29), a switching element (28), and a timer circuit (27) so as to detect a timing of a turn-on of the phase-controlled AC voltage and to, based on the detected timing, allow a current whose value is at least a threshold to flow across output terminals of the AC/DC converting unit (5) for at least a duration of a time lag between the turn-on of the phase-controlled AC voltage and the generation of the high-frequency voltage by the DC/AC converting unit (6).
摘要:
An electrodeless discharge lamp is disclosed that comprises a bulb with a substance for electric discharge sealed therein, the bulb having a reentrant portion protruding inwardly along a Z-axis direction; an induction coil arranged in the reentrant portion, the induction coil having a magnetic core and a winding wound around the magnetic core; and a drive circuit for supplying the induction coil with a power from 50 kHz to 1 MHz. The bulb has an outer diameter from 65 mm to 75 mm in a direction orthogonal to the Z-axis direction, and the magnetic core has a length L in the Z-axis direction that is 1.05 times or more a length L′ of the winding in the Z-axis direction, the length L being set to 41 mm or less.
摘要:
A self-ballasted electrodeless discharge lamp of the invention is provided with a discharge vessel filled with discharge gas, the discharge vessel having a cavity portion, a coil inserted into the cavity portion of the discharge vessel, a ballast circuit for supplying high frequency power to the coil, and a lamp base that is electrically connected to the ballast circuit, wherein the discharge vessel, the coil, the ballast circuit, and the lamp base are configured as a single unit, and a reflective tape for reflecting light that is radiated from the discharge gas and emitted from inside the discharge vessel to its cavity portion side is wound around the coil.
摘要:
A dimmable self-ballasted fluorescent lamp includes a fluorescent lamp, a ballast and a lamp base that are formed as one unit. The ballast includes a preheating current supply circuit for supplying a preheating current to the fluorescent lamp; an inverter circuit portion for supplying a high frequency AC voltage to the fluorescent lamp; and a control circuit portion for controlling a driving frequency of the inverter circuit portion. The ballast is provided with an output current limiting element for limiting an output current from the preheating current supply circuit.