KR0129632Y1 - Charging apparatus - Google Patents

Abstract

The present invention relates to a charging device, the filter means for filtering the noise component contained in the power supply voltage of the commercial AC power input from the AC power input terminal, and the full-wave rectification of the power supply voltage filtered by the filter means to a DC voltage Rectifying means, charge control means for controlling the oscillation of the switching transformer in response to the DC voltage output from the rectifying means, and the removable battery and storage battery is built-in a voltage induced on the secondary side of the switching transformer during the oscillation of the switching transformer The first, second and third output power rectifier for rectifying and smoothing to a predetermined DC voltage required for electrical appliances, and the DC voltage output from the first, second and third output power rectifier for sensing the charge level The use of the electrical appliance at the same time the charge level detection means and the state of charge of the removable battery and the electrical appliance are displayed A charging device having a display means for displaying a state, comprising: switch means for operating a switch such that a DC voltage output from the first, second and third output power rectifiers is input to the removable battery and the electrical appliance; A plurality of battery mounting boxes configured to charge a removable battery by receiving a DC voltage output from the first, second and third output power rectifiers according to the operation of the switch means, and the first according to the operation of the switch means. And a plurality of output code jacks for supplying the DC voltages output from the second and third output power rectifiers to the electrical appliance in which the battery is built.

Description

Charging device

1 is a schematic control block diagram of a charging apparatus according to the prior art.

2 is a schematic control block diagram of another charging apparatus according to the prior art.

3 is a schematic perspective view of a charging device according to an embodiment of the present invention.

4 is a control block diagram of a charging device according to an embodiment of the present invention.

5 is a detailed circuit diagram of a charging device according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

10: filter means 20: rectification means

30: charge control means 31: charge control unit

32: switching transformer 33: snubber circuit

40: output power rectifying means 41: first output power rectifying unit

42: second output power rectifier 43: third output power rectifier

50: charge level detection means 60: switch means

61: first switch 62: second switch

63: third switch 70: power storage unit

71: first output code jack 72: the first storage battery mounting

73: second output code jack 74: the second battery mounting

75: third output code jack 76: third battery installation

80 display means 81 first display unit

82: second display unit

The present invention relates to a charging device having a function of a charging adapter that uses a detachable storage battery and an electric battery with a built-in battery, as well as connecting the electric product with a built-in battery to a power supply terminal.

In general, the conventional charger has a power supply voltage of a commercial AC power supplied from the AC power input terminal 11 when a power plug (not shown) is connected to the AC power input terminal 11, as shown in FIG. The rectifying means 91 smoothes and rectifies the DC voltage to the charging control unit 92.

At this time, the charging control unit 92 is applied to the DC voltage output from the rectifying means 91 to generate a switching transformer (not shown) to supply the DC voltage output from the rectifying means 91 to the storage battery 93 The battery 93 begins to charge.

When the battery 93 starts to be charged, the charge control unit 92 continuously displays the charge level of the battery 93 and displays the 'charge' state of the battery 93 through the display means 94. .

When the charging of the storage battery 93 is completed after a predetermined time, the charging control unit 92 stops the oscillation operation of the switching transformer to prevent overcharging of the storage battery 93 and at the same time the display means 94 By displaying the complete state of charge of the battery through the user was configured to easily check the state of charge of the battery (93).

As another conventional example, as shown in FIG. 2, when a power plug (not shown) is connected to the AC power input terminal 11, the power supply voltage of the commercial AC power supplied from the AC power input terminal 11 is converted into a power transformer. 95 is reduced to a predetermined low voltage.

The AC voltage decompressed by the power supply transformer 95 is smoothed by full-wave rectification by the rectifying means 96 to a DC voltage, and the DC voltage output from the rectifying means 96 is electrically transmitted through the output code jack 97. Supplied to product 99.

In this case, the user selector switch 98 selects an input power supply voltage of 110 V; or 220 V.

However, in the conventional configuration method as described above, a charger for charging a removable battery and a charger for connecting an electric product with a built-in battery are separated, so when a user needs two or more complex functions, two chargers are used. Since all must be purchased, not only the economic burden is large, but there is a problem that the customer's satisfaction with the product is greatly reduced.

In addition, in a charger for connecting and using an electric appliance with a built-in battery, a power plug and an output cord jack are exposed outside the case of the charger, which is not only inconvenient to use, but also has a limited number of electric appliances. There was a problem that can not be charged or used at the same time.

Therefore, the present invention is made to solve the above problems, the object of the present invention is to charge the electrical appliances with built-in removable battery and storage battery, as well as to connect the electrical appliance with a built-in battery to the power terminal The present invention provides a charging device having a complex function of a charging adapter that can be used.

Another object of the present invention is to provide a charging device capable of simultaneously charging a plurality of removable batteries by configuring the shape of the battery mounting box in which the removable battery is mounted in a cylindrical and square shape, regardless of the shape of the removable battery. have.

Still another object of the present invention is to provide a charging device capable of simultaneously charging or operating a plurality of electrical appliances by configuring the shape of an output cord jack connected to an electrical appliance having a built-in battery in a variety of output voltages.

Still another object of the present invention is to provide a charging device capable of using an electrical appliance with a built-in battery while charging a removable battery according to a simple operation of a switch means.

Another object of the present invention is to provide a charging device that is beautiful in appearance and convenient to use by embedding a power plug and an output cord jack in a case.

In order to achieve the above object, the charging device according to the present invention includes a filter means for filtering noise components included in a power supply voltage of a commercial AC power input from an AC power input terminal, and a power supply voltage filtered by the filter means. Rectification means for full-flow rectification, charge control means for controlling the oscillation of the switching transformer in response to the DC voltage output from the rectifying means, and the removable battery and the voltage induced on the secondary side of the switching transformer during the oscillation of the switching transformer and Receives and charges the first, second and third output power rectifiers for rectifying and smoothing to a predetermined DC voltage required for a built-in electric appliance, and the DC voltage output from the first, second and third output power rectifiers. Charge level detecting means for detecting the level, and simultaneously displaying the state of charge of the removable battery and the electrical appliance In a charging device having a display means for displaying the use state of the electrical appliance, the switch is operated so that the DC voltage output from the first, second and third output power rectifier is input to the removable storage battery and the electrical appliance And a plurality of battery mounting boxes configured to charge a removable battery by receiving a DC voltage output from the first, second and third output power rectifiers according to the operation of the switch means. According to the present invention, the DC voltage output from the first, second and third output power rectifiers is characterized by consisting of a plurality of output code jacks to be supplied to an electric appliance with a built-in battery.

Hereinafter, with reference to the accompanying drawings an embodiment of the present invention will be described in detail.

As shown in FIG. 3, reference numeral 1 denotes a main body that forms the appearance of a charging device, and an output code jack for connecting the main body 1 to an electrical appliance having a built-in battery inside the front surface of the main body 1. (71, 73, 75) and output code jack attaching boxes (71a, 73a, 75a) for attaching the output code jacks (71, 73, 75) are mounted.

A code jack mounting cover for sealing the output code jacks 71, 73, 75 and the output code jack mounting boxes 71a, 73a, 75a from the outside outside the output code jack mounting boxes 71a, 73a, 75a. (2) is mounted, the second display portion 82 for displaying the charging and operating state of the electrical appliance is connected to the output code jack (71, 73, 75) on the upper end of the cord jack mounting cover (2) Is equipped.

In addition, a battery mounting box (72, 74, 76) for mounting the removable battery of the cylindrical type or the square type is mounted on the inside of the rear surface of the main body (1), At the upper end, the battery mounting box cover 3 for sealing the battery mounting boxes 72, 74, and 76 from the outside is mounted.

In addition, a first display portion 81 for displaying a charge amount of the removable battery mounted on the battery mounting boxes 72, 74, and 76 is mounted on the upper left side of the battery mounting cover 3. Between the display portion 81 and the second display portion 82 is equipped with a switch means 60 for selecting the charging and operation of the removable battery and the charging and operation of electrical appliances connected to the output code jacks 71, 73, 75. It is.

In addition, a plug mounting box 5 for mounting the power plug 4 is mounted on the lower side end portion of the main body 1.

As shown in Figs. 4 to 5, the filter means 10 includes internally input noise and internal noise to filter out noise components included in the power supply voltage of the commercial AC power supplied from the AC power input terminal 11. By blocking the noise generated by the filter means 10, the filter means 10 includes a resistor R1 for limiting the inrush current generated when the power plug 4 is connected to or disconnected from the AC power input terminal 11; Varistor (TNR) which prevents surge voltage generated when the power supply voltage of the commercial AC power supplied from the AC power input terminal 11 is input, and noise component included in the power voltage input from the AC power input terminal 11. It consists of choke coils L1 and L2 and capacitors C1 to C4 connected in parallel to the varistors TNR to filter.

The rectifying means 20 performs a full-cycle flow of the power supply voltage from the AC power input terminal 11 filtered by the filter means 10 to a DC voltage, and the rectifying means 20 is the filter means 10. An output stage of the bridge rectifier 21 for filtering the ripple component included in the DC voltage fully pre-flowed by the bridge rectifier 21 and the bridge rectifier 21 for full-flow current filtering by the DC. It is composed of a smoothing capacitor C5 connected to one side and grounded on the other side.

The charging control means 30 controls the charging of the power storage unit 70 by receiving the DC voltage output from the rectifying means 20, and the charging control means 30 controls the charging means 20. Charge control unit 31 for controlling the oscillation of a switching transformer to be described later to receive the DC voltage output from the power supply to the power storage unit 70 and the switching transformer under the control of the charging control unit 31 The transistor TR1 receiving the control signal output from the charging control unit 31 to control the oscillation operation of the transistor TR1 and the rectifying means 20 according to the turn-on / turn-off operation of the transistor TR1. A switching transformer 32 generating a voltage output from the DC power supply unit 70 by receiving a DC voltage outputted from the power supply unit 70, and a spike voltage and a noise component generated when the switching transformer 32 is oscillated. And a snubber circuit portion 33 composed of a resistor R2, a capacitor C6, and a diode D1 so as to protect the charge control portion 31 by removing the charge control portion 31.

The output power rectifying means 40 is a predetermined voltage required for charging the power storage part 70 when the oscillation of the switching transformer 32 under the control of the charging control means 30. By rectifying and smoothing to a level DC voltage, this output power rectifying means 40 causes the voltage induced in the secondary, 35 of the switching transformer 32, at the time of oscillation of the switching transformer 32, to be DC of a predetermined level. The first output power rectifier 41 for rectifying and smoothing the voltage and the voltage induced on the secondary side 36 of the switching transformer 32 at the time of oscillation of the switching transformer 32 are rectified to a DC voltage having a predetermined level. A second output power rectifier 42 for smoothing and a third for rectifying and smoothing the voltage induced on the secondary side 37 of the switching transformer 32 to a DC voltage at a predetermined level when oscillation of the switching transformer 32 occurs. Composed of output power rectifier 43 have.

In addition, the charge level detecting means 50 receives the DC voltage output from the first, second and third output power rectifiers 41, 42, 43 of the output power rectifier 40 and the power accumulator 70 ) Detects the charge level of the output voltage applied to the output voltage and outputs it to the charge control means 30.

Switch means 60 is a direct-current voltage output from the output power rectifying means 40 is applied to the power storage unit 70 to charge the detachable storage battery and the electrical appliance built-in battery, as well as to connect the electrical appliance The user operates the key switch so that the switch means 60 has the direct current voltage output from the output power rectifying means 40 or the first battery mounting section 72 or the first output code jack 71. The first switch 61 selected by the user and the DC voltage output from the output power rectifying means 40 to be applied to the second battery mounting box 74 or the second output code jack 73. The user selects such that the second switch 62 selected by the user and the DC voltage output from the output power current means 40 are applied to the third battery mounting box 76 or the third output code jack 75. It is comprised by the 3rd switch 63. FIG.

In addition, the power storage unit 70 receives the DC voltage output from the output power rectifying means 40 according to the user's selection of the key switch by the switch means 60 to accumulate power, thereby accumulating the power. The unit 70 includes first, second and third battery mounting boxes 72, 74, and 76 for charging the removable battery by receiving the DC voltage output from the output power rectifying means 40, and the battery is built therein. First, second, and third output cord jacks for supplying the direct current voltage output from the output power rectifying means 40 to the electrical appliance to charge the electrical appliance and to connect the electrical appliance to a charging device for use. It consists of (71, 73, 75).

The display means 80 displays the charge level of the power storage unit 70 sensed by the charge level detecting means 50 under the control of the charge control means 30, and at the same time the electricity having a built-in battery. By displaying the use state of the product, the display means 80 is inserted into the first, second and third battery mounting boxes 72, 74, 76 under the control of the charging control means 30. A first display portion 81 for displaying a charge amount of a removable battery and an electric power connected to the first, second, and third output code jacks 71, 73, 75 under the control of the charge control means 30; And a second display portion 82 which displays the charging amount of the product and displays the operation state of the electrical appliance.

In the drawing, the first output power rectifying unit 41 of the output power rectifying means 40 includes a diode D2 for half-wave rectifying the voltage induced on the secondary side 35 of the switching transformer 32, and It consists of the choke coil L3 and the capacitor C7 which filter the noise components of the high frequency and low frequency contained in the DC voltage half-wave rectified by the diode D2.

The second output power rectifier 42 of the output power rectifying means 40 includes a diode D3 for half-wave rectifying the voltage induced on the secondary side 36 of the switching transformer 32, and the diode D3. It consists of the choke coil L4 and the capacitor C8 which filter out the noise component of the high frequency and low frequency contained in the half-wave rectified DC voltage by this.

The third output power rectifying part 43 of the output power rectifying means 40 includes a diode D4 for half-wave rectifying the voltage induced on the secondary side 37 of the switching transformer 32, and the diode D4. And a coke coil L5 and a capacitor C9 for filtering high and low frequency noise components contained in the half-wave rectified DC voltage.

Hereinafter, the effect of the charging device configured as described above will be described.

First, when the power plug 4 is drawn out from the plug mounting box 5 and connected to the AC power input terminal 11, the inrush current generated when the power plug 4 is connected to the AC power input terminal 11 is The noise component which is removed through the resistor R1 of the filter means 10 and included in the power supply voltage of the commercial AC power supplied from the AC power input terminal 11 is used as a varistor (TNR) and a capacitor of the filter means 10. Filtering is performed through C1 to C4 and the choke coils L1 and L2 to block noise input from the outside and noise generated inside.

The power supply voltage from the AC power input terminal 11 filtered by the filter means 10 is full-wave rectified by the bridge rectifier 21 of the rectifying means 20 into a DC voltage, and by the bridge rectifier 21. The ripple component included in the fully currentized DC voltage is filtered through the smoothing capacitor C5.

The DC voltage filtered through the smoothing capacitor C5 is applied to the charging control unit 31, and the charging control unit 31 has a high level through the output terminal O1 to control the oscillation operation of the switching transformer 32. Control signal is output to the transistor TR.

Accordingly, the transistor TR1 is turned on by receiving a high level control signal output from the output terminal O1 of the charge controller 31 at the base terminal.

When the transistor TR1 is turned on, the DC voltage output from the rectifying means 20 is applied to the primary side of the switching transformer 32 so that the switching transformer 32 starts to oscillate.

When the switching transformer 32 starts to oscillate, the snubber circuit unit 33 attenuates spike voltage and noise components generated when the switch transformer 32 oscillates so that the charging control unit 31 operates safely. .

In oscillation of the switching transformer 32, the voltage induced on the secondary side 35 of the switching transformer 32 is half-waved through the diode D2 of the first output power rectifying unit 41 of the output power rectifying means 40. The high frequency and low frequency noise components rectified and included in the half-wave rectified DC voltage are filtered through the choke coil L3 and the capacitor C7.

The voltage induced on the secondary side 36 of the switching transformer 32 is half-wave rectified through the diode D3 of the second output power rectifying unit 42 of the output power rectifying means 40, and the half-wave rectification thereof. The high frequency and low frequency noise components included in the DC voltage are filtered through the choke coil L4 and the capacitor C8.

In addition, the voltage induced on the secondary side 37 of the switching transformer 32 is half-wave rectified through the diode D4 of the third output power rectifying unit 43 of the output power rectifying means 40, and the half-wave rectification thereof. The high frequency and low frequency noise components included in the DC voltage are filtered through the choke coil L5 and the capacitor C9.

At this time, when the user wants to charge the removable battery, the first, second, and third devices mounted on the inner side of the rear side of the main body 1 shown in FIG. After inserting the removable battery into the battery mounting boxes 72, 74, and 76, the first and second light third switches 61, 62, and 63 mounted on the upper left end of the main body 1 are turned on. Let's do it.

Of course, in this case, the case where the cylindrical type and the rectangular type removable battery are inserted into the three first, second and third battery mounting boxes 72, 74, and 76 will be described as an example. When the battery is inserted into the first battery mounting box 72, only the first switch 61 is turned on to the upper end.

When the removable battery of the rectangular type is inserted into the second battery mounting box 74, only the second switch 62 is turned on to the upper end, and the rectangular type removable battery is inserted into the third battery mounting box 76. In the case of insertion, only the third switch 63 needs to be turned on.

When the first, second, and third switches 61, 62, and 63 are turned on to the top as described above, the first, second, and third switches 61, 62, and 63 shown in FIG. 5 are contact terminals. Removable storage battery through the first, second and third battery mounting boxes 72, 74, 76 while being connected to (L) and the DC voltage output from the first, second and third output power rectifier 43 Is applied to the removable battery starts to charge.

At this time, the charge level detecting means 50 receives the DC voltage output from the first, second and third output power rectifiers 41, 42, and 43 to mount the first, second and third storage batteries ( The charge level of the removable storage battery inserted into the 72, 74, 76 is continuously detected and output to the charge control unit 31.

Therefore, the charging control unit 31 displays the state of charge and the amount of charge of the removable storage battery through the first display unit 81 mounted on the upper left side of the main body 1 so that the user can control the first, second and It is possible to easily check the state of charge and the charge amount of the removable storage battery inserted into the three storage battery mounting boxes (72, 74, 76).

When a predetermined time elapses and the charging of the removable battery is completed, the charge control unit 31 outputs a low level control signal to the transistor TR1 through the output terminal O1.

Accordingly, the transistor TR1 receives the low level control signal output from the output terminal O1 of the charge control unit 31 from the base terminal and is turned off while stopping the oscillation operation of the switching transformer 32. Charging of the accumulator stops.

In addition, the charging control unit 31 indicates that the removable battery is fully charged, that is, a full state through the first display unit 81 so that the user can easily check it.

If the user wishes to charge the electrical appliance with a built-in battery, the cord jack mounting cover 2 mounted on the inner front of the main body 1 shown in FIG. 3 is removed, and then the output cord jack mounting box ( Take out the output code jacks 71, 73, 75 from 71a, 73a, 75a and insert it into the desired electrical appliance.

At this time, one or more (up to three in one embodiment of the present invention) can be selected by the user selecting an output code jack 71, 73, or 75 configured according to the voltage specification of the electrical appliance to be charged. The first, second and third switches 61, 62, and 63 are turned on to the lower ends of the charging device through the output code jacks 71, 73, and 75.

Of course, in this case, the three output code jacks 71, 73, and 75 are all inserted into electrical appliances as an example, and the user arbitrarily selects one or more electrical appliances to suit the voltage specifications.

When the first, second, and third switches 61, 62, and 63 are turned to the lower end as described above, the first, second, and third switches 61, 62, and 63 shown in FIG. 5 are contact terminals. DC voltages output from the first, second, and third output power rectifiers 41, 42, and 43 while connected to (H) may cause the first, second, and third output code jacks 71, 73, 75 to Is applied to the electrical appliance through which the electrical appliance begins to charge.

At this time, the charge level detecting means 50 receives the DC voltage output from the first, second and third output power rectifiers 41, 42, 43 and continuously detects the charge level of the electrical appliance and charges the charge. Output to the control part 31.

Therefore, the charging control unit 31 displays the state of charge and the amount of charge of the electrical appliance through the second display unit 82 mounted on the upper left side of the main body 1 so that the user can display the state of charge and the amount of charge of the appliance. Make it easy to check.

When charging of the electrical appliance is completed after a predetermined time, the charging control unit 31 outputs a low level control signal to the transistor TR1 through the output terminal O1.

Accordingly, the transistor TR1 receives the low level control signal output from the output terminal O1 of the charging control unit 31 from the base terminal and turns off while the oscillation operation of the switching transformer 32 is stopped. The product stops charging.

In addition, the charging control unit 31 displays that the electrical product is completed through the second display unit 82 so that the user can easily check it.

As another example, when the user wants to use an electric appliance with a built-in battery, the output code jacks 71, 73, and 75 are inserted into the electric appliance.

At this time, one or more (up to three in one embodiment of the present invention) can be selected by the user selecting an output code jack 71, 73, or 75 configured according to the voltage specification of the electrical appliance to be used. Connected to the charging device through an output code jack (71, 73, 75) and then the first, second and third switches (61, 62, 63) on the lower end of the separate operation provided in the electrical appliance Turn on the switch.

Of course, in this case, the three output code jacks (71, 73, 75) is inserted into the electrical appliance as an example, and the user is one or more (up to three in the present invention) to the voltage specification Use it according to your choice.

When the first, second, and third switches 61, 62, and 63 are turned to the lower end as described above, the first, second, and third switches 61, 62, and 63 shown in FIG. 5 are contact terminals. DC voltages output from the first, second, and third output power rectifiers 41, 42, and 43 while connected to (H) may cause the first, second, and third output code jacks 71, 73, 75 to Is applied to the electrical appliance through which the electrical appliance starts to operate.

At this time, in order to charge or use the electrical appliance, a user must separately operate an operation switch provided in the electrical appliance.

On the other hand, in one embodiment of the present invention has been described taking the case of charging or detachable storage battery and the case of charging or using an electric appliance with a built-in battery, the present invention is not limited to this for the removable operation by simple operation of the switch means It is possible to simultaneously charge the storage battery and the electrical appliance with a built-in battery, or to perform the charging and use of the electrical product at the same time, the charging and use of the electrical product can be carried out at the same time, It is of course possible to simultaneously charge and charge and use the electrical appliance.

According to the charging device according to the present invention as described in the above, the charging and discharging battery and the electric battery with a built-in battery, as well as the charging for enabling the use of the electric product with a built-in battery connected to the power terminal It is equipped with the function of the adapter in combination, and the shape of the battery mounting box in which the removable battery is mounted in a cylindrical and square shape to charge a plurality of removable batteries at the same time regardless of the shape of the removable battery. Forming the shape of the output cord jack connected to the built-in electrical appliances by the output voltage can be configured to charge or use a plurality of electrical products at the same time, and to charge the removable battery according to the simple operation of the switch means At the same time, you can use electrical appliances with built-in batteries. By incorporating the inside of the case has an excellent effect that the appearance is beautiful and convenient to use.

Claims (4)

Filter means for filtering the noise component contained in the power supply voltage of the commercial AC power input from the AC power supply input terminal, Rectification means for full-wave rectification of the power supply voltage filtered by the filter means to DC voltage, and output from the rectification means. Charge control means for controlling the oscillation of the switching transformer by receiving a direct current voltage, and the voltage induced on the secondary side of the switching transformer at the time of oscillation of the switching transformer to a predetermined DC voltage required for a removable battery and an electric appliance having a built-in battery. First, second and third output power rectifiers for rectifying and smoothing; charge level sensing means for sensing a charge level by receiving a DC voltage output from the first, second and third output power rectifiers; Display means for displaying the state of charge of the battery and the electrical appliance and the state of use of the electrical appliance A charging device, comprising: switch means for operating a switch such that DC voltages output from the first, second, and third output power rectifiers are input to the removable storage battery and an electrical appliance; A plurality of battery mounting boxes for charging a removable battery by receiving a DC voltage output from the first, second and third output power rectifier, and the first, second and third output power rectifier according to the operation of the switch means Charging device, characterized in that consisting of a plurality of output code jacks for supplying the DC voltage output from the electrical appliance with a built-in battery. 2. The apparatus of claim 1, wherein the charge control means comprises a charge control unit, a transistor that is turned on / off under the control of the charge control unit, and a DC voltage output from the rectifying unit according to the turn on / off operation of the transistor. And a switching transformer for generating an output voltage applied to the power storage unit, and a snubber circuit unit for removing the spike voltage and noise component generated during oscillation of the switching transformer to protect the charging control unit. Charging device. The display apparatus of claim 1, wherein the display means comprises: a first display portion for displaying a charge amount of a removable storage battery inserted into the first, second, and third battery mounting boxes under the control of the charging control means; And a second display unit for displaying the charging amount of the electrical appliance connected to the first, the second and the third output code jacks under the control, and the operation state of the electrical appliance. The rectifier of claim 1, wherein the first, second, and third output power rectifiers include a diode for half-wave rectifying the voltage induced on the secondary side of the switching transformer, and noise included in the DC voltage half-wave rectified by the diode. Charging device comprising a choke coil and a capacitor for filtering the components.