Abstract: A power supply system includes an input stage comprising first and second input switches to provide a primary current responsive first and second input switching signals. A transformer generates a secondary current responsive to the primary current. An output stage comprises an output, a first output switch, a second output switch and a clamping switch. The output stage can be configured to generate an output voltage at the output by rectifying the secondary current responsive to respective first and second output switching signals. The clamping switch can be configured to close responsive to a clamp switching signal during an activation dead-time between closing the first input switch and the second input switch. The system further includes a switching controller configured to generate the first and second input switching signals and the first and second output switching signals based on the output voltage, and to generate the clamp switching signal.

Abstract: A power semiconductor module includes at least one upper arm provided between a positive electrode line and a node and including a power semiconductor device and a freewheeling diode connected in parallel, at least one lower arm provided between a negative electrode line and the node and including a power semiconductor device and a freewheeling diode connected in parallel, and a snubber circuit provided between the positive electrode line and the negative electrode line. The snubber circuit includes a snubber capacitor and a snubber resistor connected in series. At least one control terminal outputs a voltage representing the temperature of the snubber resistor or a voltage related to the temperature of the snubber resistor to a driver that drives the power semiconductor device.

Abstract: Methods and apparatus for controlling a power converter are provided herein. For example, apparatus can include a series resonant circuit including transformer with a primary side winding directly coupled to a DC bridge drive and a control system connected to the series resonant circuit and configured to measure a voltage at the primary side winding for determining a bias signal that can be applied to a resonant capacitor voltage at a secondary side winding of the transformer for restoring a DC content of the DC bridge drive to about zero.

Abstract: A converter circuit arrangement and a method for operating a converter circuit arrangement are disclosed.

Abstract: Provided is DC-DC converter including a first inductor configured to output a first inductor current based on an input voltage, a second inductor configured to output a second inductor current based on the input voltage, an output network unit configured to provide a first output voltage to a first output terminal and provide a second output voltage to a second output terminal based on the first inductor current or the second inductor current, a controller configured to determine cross-regulation with respect to the first output terminal and the second output terminal and generate a mode signal based on the determination, and an inductor network unit configured to connect the first inductor and the second inductor based on the mode signal or electrically isolate the first inductor and the second inductor.

Abstract: An image forming apparatus includes a photoconductor, a charging roller configured to charge the photoconductor, and a self-excited oscillation circuit. The image forming apparatus includes a transformer including a primary coil and a secondary coil, the transformer being configured to produce, at the secondary coil, a voltage applied to the charging roller, in accordance with the primary coil being driven by the self-excited oscillation circuit. The image forming apparatus includes a controller configured to control, at start-up of the self-excited oscillation circuit, the self-excited oscillation circuit to allow an amount of a current flowing through the primary coil to be larger than an amount of a current flowing from the photoconductor through the secondary coil, via the charging roller.

Abstract: An automation technology field device with at least two connection terminals to which a two-wire line or a four-wire line can be connected, such that a loop current can be supplied to the field device via the connection terminals. A safety device is provided which is used to ensure the electromagnetic compatibility and/or the explosion proofing of the field device, wherein the safety device is connected to each connection terminal via one line each, and wherein at least one current converter arranged around the line is provided, which reads back the loop current in at least one of the two lines between the safety device or parts of the safety device and the connection terminals in a galvanically isolated manner.

Abstract: A primary resonant network for a wireless power transfer has a primary winding capable of being energized to provide a magnetic field, and a reactive component selected to constrain the reactive loading on a power supply which energizes the primary resonant network. The reactive component is selected dependent on a given variation in inductance or capacitance of the primary resonant network and a given variation in inductance or capacitance of a secondary resonant network coupled to the primary resonant network.

Abstract: In an example, a circuit for voltage regulation includes a capacitor module, a multiple winding transformer, and a switching module. The capacitor module includes a first capacitor and a second capacitor. The multiple winding transformer includes a first primary side winding, a second primary side winding, and a secondary side winding. The switching module is configured to selectively switch the multiple winding transformer in a first state and a second state. During the first state, the switching module electrically couples the capacitor module to the multiple winding transformer. During the first state, the switching module electrically couples the first capacitor to the first primary side winding and electrically couples the second capacitor to the second primary side winding. During the second state, the switching module electrically couples the secondary side winding to a load. In another example, a circuit includes a voltage doubler module, transformer, and switching module.

Abstract: An example device in accordance with an aspect of the present disclosure includes a converter to convert an input voltage to an output voltage. The converter includes an input connector that occupies greater than one third of a frontal area of the converter.

Abstract: According to an embodiment, a power supply system includes a power storage unit, a changeover unit, and a control unit. The power storage unit is configured to store electric power generated by a power generation unit. The changeover unit is configured to make a changeover between a first state in which a load is connected to the power generation unit and a second state in which the load is connected to the power storage unit but not the power generation unit. The control unit is configured to perform control to make the changeover to the first state when a value obtained by subtracting a first value from a value of the electric power fed from the power generation unit is not less than a value of the electric power fed to the load. Otherwise, the control unit is configured to perform control to make the changeover to the second state.

Abstract: An electronic circuit device includes a board and a transformer that is provided at the board and that has a primary winding member and a secondary winding member. The primary winding member is configured with a primary winding that is provided at the board and a primary side element that is electrically connected to the primary winding member. The secondary winding member is configured with a secondary winding that is provided at the board and a secondary side element that is electrically connected to the secondary winding member.

Abstract: A microcomputer section operates by use of electric power from a power supply section. The microcomputer section carries out control so that any one of a plurality of switching circuits is selected, the selected one of the plurality of switching circuits causes an electric current from a corresponding current transformer of a plurality of current transformers to flow to the microcomputer section, whereas the other unselected switching circuits cause electric currents from respective current transformers of the plurality of current transformers to flow to the power supply section, and the selection is carried out successively with respect to each of the plurality of switching circuits.

Abstract: The invention is an apparatus for and method of configuring a solar PV system where the output power of the system is stabilized under dynamic cloud cover conditions. The invention comprises a typical grid-tied solar photovoltaic power system which includes solar modules and a typical grid-tied DC to AC power converter and a second, semi-autonomous, bidirectional power converter coupled between the same electrical grid and storage batteries. The system also includes sensors and/or a communication link between the two power converters. The composite system acts to stabilize the amount of power into the grid by monitoring dynamic power reductions in PV power production and by supplying power from the storage batteries to the grid during a PV power dropout event, for a net smoothing of the amount of power injected into the grid over a wide range of dropout event durations.

Abstract: This disclosure relates to power converters that are capable of providing smooth transitions between multiple output voltage levels. The converter's output may need to be changed from, e.g., 5V to 12V, 15V, or 20V—based on the charging device's request. By using improved power converter designs comprising both a flyback converter circuit and variable-frequency buck converter circuit that may each be selectively coupled to an output load, a more smooth, e.g., monotonous, transition between output voltage levels may be achieved. In particular, by varying the switching frequency of the buck converter in a controlled way, the output voltage of the power converter may rise monotonically during the transition between output voltage levels. According to some embodiments, once the output of the buck converter has reached its maximum value, the buck converter may be disabled, and the flyback converter may be enabled to begin supplying the output voltage to the load.

Abstract: In accordance with embodiments of the present disclosure, a battery back-up unit for supplying electrical energy to an information handling resource via a power bus in response to a power event affecting an ability of a power supply unit to deliver electrical energy to the information handling resource via the power bus may be configured to, in response to the power event and prior to the power supply unit ceasing to deliver electrical energy to the power bus monitor a current share bus having a current share signal driven at least in part by the power supply unit, the current share signal indicative of a first current driven by the power supply unit to the power bus, drive a second current to the power bus in accordance with the current share signal, and refrain from driving the current share bus.

Abstract: A self-excited push-pull converter, where between the bases of the push-pull converter's transistors (TR1, TR2) and the effective power suppler there is provided a constant current source (II), which provides a constant current to the bases of the transistors. With the working voltage increases, the circuit enters into an operating mode not based on the core-saturation working mode, because the transistors' base current is limited by the constant current source and consequently the transistors' collector current cannot increase.

Abstract: A power supply device includes a transformer, a rectification smoothing circuit having positive and negative output ends that rectifies and smoothes an induced voltage at a secondary winding of the transformer so as to generate a direct current voltage between positive and negative output terminals, a serial connection terminal to which another power supply device is connectable and is connected to the positive output end, the negative output terminal is connected to the negative output end, the reverse flow prevention rectifying device is connected between the positive output end and the positive output terminal, its forward direction faces toward the positive output terminal, and the bypass rectifying device is connected between the positive output end and the negative output end, its forward direction faces toward the positive output end. Therefore, a plurality of power supply devices are easily connected in series without providing external diodes for each power supply device.

Abstract: An integrated power-converting module includes a bobbin, a primary coil, a magnetic core assembly, and a plurality of power-converting units. The bobbin includes a main body, a plurality of winding portions and a plurality of receiving portions, and the winding portions and the and the receiving portion are arranged in a staggered manner. The primary coil is wound on the winding portions and the magnetic core assembly is assembled with the bobbin. Each power-converting unit includes a circuit board, a rectifier, and a filter, the rectifier and the filter are placed on a base portion of the circuit board and electrically connected thereto. An extending portion of the circuit board connect to the base portion is inserted into a slot formed within the receiving portion, and a penetrating hole formed on the extending portion is aligned with and communicated with a first channel formed on the main body.

Abstract: A multi-output power supply apparatus may include a transformer unit transforming a voltage level of input power using a primary winding and first and second secondary windings, a first output unit stabilizing power applied to the first secondary winding using a voltage multiplier circuit and outputting first power, and a second output unit stabilizing power applied to the second secondary winding and outputting second power.

Abstract: A power converting device includes a transformer, a first switch coupled to a primary winding of the transformer, a PWM controller which generates a first PWM signal for controlling conduction and non-conduction of the first switch and which generates a control signal that leads the first PWM signal, a rectifier-filter circuit which rectifies an induced voltage generated by a secondary winding of the transformer, a second switch coupled to the secondary winding, and a synchronous rectifier controller which controls conduction and non-conduction of the second switch, and which controls, according to the control signal, the second switch to become non-conductive prior to conduction of the first switch.

Abstract: A power supply device includes a substrate, a transformer, a rectifying section, a filtering section, at least one first capacitor section, and a second capacitor section. The substrate includes at least one semiconductor element. The transformer inputs an electric power via at least one pair of primary-side terminals, transforms the input electric power, and outputs the transformed electric power via at least one pair of secondary-side terminals. The rectifying section includes at least one rectifying element configured to rectify the transformed electric power. The filtering section reduces alternating-current components included in the rectified electric power. The first capacitor section is connected in parallel to the at least one rectifying element. The second capacitor section generates one or more harmonic waves that reduce a peak value of a fundamental wave of resonance generated based on a leakage inductance component of the transformer and a capacitance component of the first capacitor section.

Abstract: In various embodiments, a two-switch flyback power supply may include a transformer having a primary winding and a secondary winding to feed a load; a pair of electronic switches alternatively switchable on and off to connect the primary winding of said transformer to an input line to feed said primary winding of said transformer, wherein at least one of said electronic switches is an electronic switch having a control electrode floating with respect to ground; a capacitive voltage divider arranged between said input line and the ground of the device, with the dividing point of said capacitive voltage divider connected to an intermediate point of said primary winding of said transformer; and an auxiliary secondary winding in said transformer, said auxiliary secondary winding feeding the control electrode of said at least one of said electronic switches.

Abstract: A self-excitation push-pull type converter with a transformer having a closed magnetic core or iron core, which formed of a main part (52) and a local part (53). The local part reaches magnetic saturation earlier than the main part under the same increasing magnetic field excitation. When the self-excitation push-pull type converter is in a light load state, the efficiency is significantly improved, and further improved in a rated load state. As the number of turns of the coil on the magnetic saturation transformer is reduced, the working frequency of the converter increases while still keeping the loss low. The probability of generating a current peak at the moments of switching on or off is reduced, thereby further improving the efficiency and reducing output ripples.

Abstract: A multi-level power converter system includes a multi-level power converter configured to synthesize at least three direct current (DC) voltages into an alternating current (AC) output voltage, and includes a plurality of transistors. A controller generates pulse-width modulation (PWM) signals used to control a state of the plurality of transistors of the multi-level converter by comparing first and second carrier signals to a reference signals, wherein a period of the first and second carrier signals is randomly varied from a nominal period.

Abstract: A DC to DC converter system, includes inverter circuitry having a first and a second switch, the inverter circuitry further configured to generate a first and a second gate control signal, the signals configured to open and close the first and second switch, respectively, and generate an AC signal from a DC input signal. The system further includes transformer circuitry configured to transform the AC signal into a sinusoidal AC signal, second stage circuitry configured to rectify the sinusoidal AC signal to a DC output signal, and hybrid control circuitry configured to modulate the first and second gate control signals, wherein the modulation comprises pulse frequency modulation (PFM) and pulse width modulation (PWM).

Abstract: A resonant conversion system is provided, in which a resonant converter receives an input voltage to generate an output voltage, and a buck converter provides the input voltage of the resonant converter, and controls the input voltage to perform an over-current protection process.

Abstract: An inverter with soft switching is used for a high step-up ratio and a high conversion efficiency. The inverter includes an isolation voltage-quadrupling DC converter and an AC selecting switch. The isolation voltage-quadrupling DC converter includes an active clamping circuit. By a front-stage converter circuit, a continuous half-sine-wave current is generated. By a rear-stage AC selecting switch, the half-sine-wave current is turned into a sine-wave current. Thus, electricity may be supplied to an AC load or the grid. The circuit is protected by isolating the low-voltage side from the high-voltage side. The conversion efficiency is high. The leakage inductance is low. The switch stress is low. The inverter is durable and reliable. Hence, the inverter is suitable for use in a photovoltaic system to increase the total conversion efficiency.

Abstract: A current resonance power supply includes a transformer having a primary winding and a secondary winding, two switching elements connected to one end of the primary winding of the transformer and arranged in series, a resonance capacitor connected to the other end of the primary winding, and a voltage detection unit connected between the one end of the primary winding and the two switching elements and configured to detect that AC voltage input to a primary side of the transformer becomes lower, wherein operations of the switching elements are controlled based on a detection result of the voltage detection unit.

Abstract: A switching power supply apparatus includes a low-side switching control unit and a high-side switching control unit. The low-side switching control unit includes a low-side turn-off circuit that turns off a low-side switching element behind a delay time when reversal of the polarity of a winding voltage of a transformer is detected during a period in which a drive voltage signal is supplied to the low-side switching element. The high-side switching control unit includes a high-side turn-on delay circuit that delays a time from the time when the polarity of the winding voltage of the transformer is reversed to a time when a high-side switching element is turned on. The delay time of the low-side turn-off delay circuit is set so as to be shorter than the delay time of the high-side turn-on delay circuit.

Abstract: A power supply apparatus includes an AC-DC rectifier, a transformer, a feedback inductor, a resonant unit, and a primary and auxiliary switch. The AC-DC rectifier rectifies an input voltage. The transformer includes a primary coil having a first primary coil and an isolated second primary coil, and transforms a first voltage of the primary coil into a second voltage of the secondary coil. The feedback inductor is connected to a tap between the first primary coil and second primary coil and an output of the AC-DC rectifier. The resonance unit is connected in parallel with the secondary coil and is configured to output an output voltage by rectifying the second voltage provided from the secondary coil. The primary switch and secondary switch are connected in parallel between the transformer and AC-DC rectifier.

Abstract: A switching control IC conducts on-off control on a first switching element. A second switching control circuit is provided between a high-side driving winding of a transformer T and a second switching element. The second switching control circuit discharges a capacitor in a negative direction with a constant current during an on period of the first switching element, and then after the second switching element is turned on, charges the capacitor in a positive direction with a constant current. A transistor controls the on period of the second switching element in accordance with the ratio of a charging current to a discharge current such that the ratio of the on period of the second switching element to the on period of the first switching element is substantially always constant.

Abstract: A diagnosis device and method of a voltage transformer can include a current transformer disposed at one side of an output port for generating a current variation according to an on/off operation of a power switch element; a first current detector configured to detect a forward direction current from the current transformer; a second current detector configured to detect a reverse direction current from the current transformer; a first voltage transformer configured to transform the forward direction current detected from the first current detector to a forward direction voltage; a second voltage transformer configured to transform the reverse direction current detected from the second current detector to a reverse direction voltage; and a diagnosis portion for comparing the forward direction voltage with the reverse direction voltage to determine whether or not an offset is formed.

Abstract: A vehicle burglar alarm circuit includes a transformer having first to fourth taps, a center tap provided at a center point and output taps, wherein the number of coil turns between the first and second taps is greater than the number of coil turns between the third and fourth taps; and output taps connected with a sounding body. The circuit further includes a first and second power sources connected to the center tap, the second power source outputting a lower output voltage; a sounding body driving unit having first to fourth driving switches respectively connected to the first to fourth taps; and a controller which controls the sounding body driving unit. The first and second driving switches are alternately turned on/off when using the first power source, and the third and fourth driving switches are alternately turned on/off when using the second power source.

Abstract: Power supplies, power adapters, and related methods are disclosed. One example power supply includes an open loop DC to DC converter having an input for connecting to an input power source and an output for supplying a DC output voltage or current and an enable/disable circuit coupled to the open loop DC to DC converter. The enable/disable circuit is configured to enable and disable the open loop DC to DC converter as a function of the DC output voltage or current. One example method includes determining a DC output voltage or current from an open loop DC to DC converter and enabling and disabling the open loop DC to DC converter as a function of the determined DC output voltage or current.

Abstract: Systems and methods are provided for delivering energy from an input interface to an output interface. An electrical system includes an input interface, an output interface, an energy conversion module coupled between the input interface and the output interface, and a control module. The control module determines a duty cycle control value for operating the energy conversion module to produce a desired voltage at the output interface. The control module determines an input power error at the input interface and adjusts the duty cycle control value in a manner that is influenced by the input power error, resulting in a compensated duty cycle control value. The control module operates switching elements of the energy conversion module to deliver energy to the output interface with a duty cycle that is influenced by the compensated duty cycle control value.

Abstract: An apparatus includes an inverter including a high-side switch coupled to a low-side switch, the inverter generating a time-varying drive current from a plurality of drive control signals, a positive rail voltage, and a negative rail voltage wherein controlling the switches to generate the time-varying drive current produces a potential transitory overshoot condition for one of the switches of the inverter; a drive control, coupled to the inverter, to generate the drive control signals and to set a level of each of the rail voltages responsive to a plurality of controller signals; and a controller monitoring one or more parameters indicative of the potential transitory voltage overshoot condition, the controller dynamically adjusting, responsive to the monitored parameters, the controller signals to reduce a risk of occurrence of the potential transitory voltage overshoot condition.

Abstract: A resonant inverter includes inductive elements (L1, L2) that allow the number of magnetic components in the inverter to be reduced. The elements (L1, L2) may be designed with a leakage inductance to eliminate the need for a large DC inductor. They may also perform the function of a current splitting transformer. The inverter switches may also be driven directly from the inverter circuit without a separate controller being required.

Abstract: A phase-controlled power supply is disclosed. The power supply includes a power conditioner with an input configured to connect to an external source of electrical power, the power conditioner being configured to provide conditioned power on its output. The power supply also includes a transformer having a primary winding and a secondary winding, and a switching module coupled between the output of the power conditioner and to the primary winding of the transformer. The switching module has two modes of operation and a control signal input configured to accept a first control signal. The switching module includes a switching element configured to connect the power conditioner output to the primary winding of the transformer. The switching module operates in the first mode when the first control signal is in a first state, switching the first switching element at a first frequency and first duty cycle.

Abstract: An inverter drive power supply circuit for driving a plurality of inverter switching devices that form an inverter circuit, includes a number N of transformers (N is an integer equal to or larger than 2) adapted to a push-pull method, each having a first winding and a second winding for a primary winding and a first winding and a second winding for a secondary winding, and supplying an output voltage of the secondary winding to the inverter switching devices.

Abstract: This DC-DC converter circuit includes: first and second switching elements (S1, S2); an output transformer (T) that includes a first primary winding (P1) connected in series between the positive electrode sides of the first and second switching elements (S1, S2), a second primary winding (P2) connected in series between their negative electrode sides, a secondary winding (S) for obtaining an output voltage, and tertiary windings (n3, n4); a first voltage source (C1), connected between a first connection point at which the first primary winding (P1) is connected to the second switching element (S2) and the first switching element (S1), that applies a voltage to the first switching element via the first primary winding; a second voltage source (C2) connected to locations symmetric with those of the first voltage source (C1); and a control unit (CT) that turns the first and second switching elements (S1, S2) alternatingly ON and OFF, and first and second regeneration snubber circuits (SN1, SN2) for regenerating

Abstract: A high-side transistor and a low-side transistor each has gate electrodes configured so as to allow signals to be input and output via a driving contact and a detection contact provided at different positions. When a control signal is at a first level and a signal output from the detection contact on the low-side transistor side is at a low level, the high-side driver applies a low-level signal to the driving contact on the high-side transistor side. When the control signal is at a second level and a signal output from the detection contact on the high-side transistor side is at a high level, the low-side driver applies a high-level signal to the driving contact on the low-side transistor side.

Abstract: A resonant power conversion apparatus includes a transformer T1 having a primary winding n1, a secondary winding n2, a tertiary winding n3, and a reset winding nR, a series circuit of switches S1 and S2, a capacitor Cr1 and diode D1 to the switch S1, a capacitor Cr2 and diode D2 to the switch S2, a series circuit of the winding n1 and a diode Dn1, a series circuit of the winding nR and a diode DR, a reactor Lr connected between a connection point of the switches S1 and S2 and a connection point of the windings n2 and n3, a switch S10 connected between the DC power source and the winding n2, a switch S20 connected between the DC power source and the winding n3, and a controller 10 configured to perform a zero-voltage switching operation of the switches S1 and S2.

Abstract: In order to further develop a circuit arrangement (100) as well as a method for generating at least one drive signal for at least one synchronous rectification switch of at least one flyback converter in such way that an improved and simpler thermal management can be combined with a significant cost reduction as well as with a higher efficiency, it is proposed to generate the drive signal for said synchronous rectification switch as a function of at least one oscillating signal controlling the synchronous rectification switch, of at least one constant delay time, of at least one variable delay time, and of at least one Boolean OR function.

Abstract: A DC to AC inverter used in a solar cell power system can include an improved control scheme for cooling itself and optimizing power output.

Abstract: This inverter circuit includes two switching elements which are turned alternately ON and OFF, and a first primary winding connected in series between these switching elements, and also includes an output transformer having a secondary winding for obtaining an output voltage. This inverter circuit also includes a first voltage source and a second voltage source. The first voltage source applies a voltage to the first switching element via the first primary winding. And the second voltage source applies a voltage to the second switching element via the second primary winding. This inverter circuit also includes a regeneration snubber circuit for regenerating charge accumulated in a snubber capacitor. The regeneration snubber circuit includes a regeneration circuit including a voltage boost section which converts the primary side voltage of the output transformer to a predetermined voltage, which it outputs.

Abstract: Provided is a transformer, comprising a first winding and a second winding that interlink with a main magnetic flux; and a third winding that interlinks with a magnetic flux leakage interlinking with only one of the first winding and the second winding.

Abstract: This inverter circuit includes first and second switching elements and an output transformer which has a first primary winding connected in series between the first switching element and the second switching element and a second primary winding for obtaining an output voltage. The inverter circuit also includes a first voltage source, a second voltage source, and a control unit. The first voltage source is connected between a first connection point at which the first primary winding is connected to the second switching element, and the first switching element, and applies a voltage to the first switching element via the first primary winding. And the second voltage source is connected between a second connection point at which the first primary winding is connected to the first switching element, and the second switching element, and applies a voltage to the second switching element via the first primary winding.

Abstract: This current balanced push-pull type inverter circuit includes first and second switching elements, and an output transformer which includes a first primary winding and a second primary winding connected in series between said first and second switching elements, and also includes a secondary winding for obtaining an output voltage. This inverter circuit also includes a first voltage supply capacitor, a second voltage supply capacitor, and a control unit. A first snubber circuit, in which a first free wheel diode and first and second snubber capacitors are connected in series, is connected in inverse parallel to the first switching element. A first discharge resistor is connected between the first snubber capacitor and a first power supply capacitor, and a second discharge resistor is connected between the second snubber capacitor and a third power supply capacitor. And a second snubber circuit and discharge resistors are connected to the second switching element as well, in a similar manner.

Abstract: An integrated power-converting module includes a bobbin, a primary coil, a magnetic core assembly, and a plurality of power-converting units. The bobbin includes a main body, a plurality of winding portions and a plurality of receiving portions, and the winding portions and the and the receiving portion are arranged in a staggered manner. The primary coil is wound on the winding portions and the magnetic core assembly is assembled with the bobbin. Each power-converting unit includes a circuit board, a rectifier, and a filter, the rectifier and the filter are placed on a base portion of the circuit board and electrically connected thereto. An extending portion of the circuit board connect to the base portion is inserted into a slot formed within the receiving portion, and a penetrating hole formed on the extending portion is aligned with and communicated with a first channel formed on the main body.