JP6338076B2 - Charger - Google Patents

Description

The present invention relates to a charging device that charges a battery pack that is detachably attached to, for example, a cordless electric tool.

The cordless electric tool is detachably mounted with a battery pack for supplying electric power to a motor as a driving source. The battery pack includes a secondary battery cell such as a rechargeable lithium battery. A charging device is used to charge the battery pack. The charging device includes a light emitting unit such as an LED that displays a charging state. The light emitting unit is lit by power supply from the secondary circuit of the charging device. Light emitted from the light emitting unit is guided to the upper surface of the case by a light guide such as a prism.

JP 2008-236879 A

In the conventional charging device, the light emitted from the light emitting unit is guided to the center of the upper surface of the case by the columnar light guide, but the center of the upper surface of the case is a position immediately adjacent to the battery pack attached to the charging device. For this reason, the light emitted from the light emitting unit is often hidden from view by the battery pack. Moreover, in the conventional charging device, the light colors of the light emitting units are only red and green, and only red and green or a combination of them can be expressed. Moreover, the conventional charging device has only a charging function for the battery pack, and there is room for improvement in terms of convenience.

The present invention has been made in view of such a situation, and a first object of the present invention is to provide a charging device that has better visibility of light emitted from a light emitting unit than in the past.

A second object of the present invention is to provide a charging device that can display a color that could not be displayed in the conventional charging device for charging a battery pack for an electric tool.

A third object of the present invention is to provide a highly convenient charging device having a function other than a charging function for a battery pack.

The present invention is a charging device. This charging device
A case for detachably attaching the battery pack;
A light emitting part provided in the case;
A light guide that guides the light emitted from the light emitting unit to the surface side of the case, and
The light emitting unit includes a plurality of LEDs,
The light guide is a single plate-like member extending from the light emitting unit side to the surface side of the case,
The light guide includes a slit that extends between the light emitting unit and the surface of the case in a longitudinal direction of the light guide, and a light diffusion member that faces the light emitting unit and faces the plurality of LEDs. And an inclined portion.

  The light guide may be integrally formed with the case.

  The light emitting unit includes a blue LED, a red LED, and a green LED,
  A plurality of stages of charging progress and charging states other than the charging progress may be displayed by the common light emitting unit and the light guide.

  The light emitting unit may include a blue LED, a red LED, and a green LED in one chip.

  The light guide may protrude outward from the upper surface of the case and extend along the upper surface at a position away from the battery pack attached to the case.

  The length of the portion of the light guide facing the outside of the case may be 1/3 or more of the length of one side of the case adjacent to the portion.

  In the case, a light emitting unit substrate on which the light emitting unit is mounted may be provided separately from a main substrate having a charging function.

  The light emitting unit substrate may be fixed to the light guide.

  At least a part of the light emitting unit substrate may be in a position facing a portion of the main substrate on which the primary circuit is mounted.

  The light emitting unit substrate may be connected to a secondary side circuit of the main substrate by a lead wire.

  You may provide the terminal for external electric power feeding which can supply direct-current power to an external electric equipment, and the display part for electric power feeding regarding the supply of direct-current power via the said external power feeding terminal.

  Provided with an external power supply changeover switch for switching validity / invalidity of the supply of DC power via the external power supply terminal, and the external power supply changeover board mounted with the external power supply changeover switch and the power supply display unit has a charging function It may be provided separately from the main board having

You may provide separately the display part for electric power feeding regarding the supply of DC power via the said external power feeding terminal, and the display part for charge regarding charge of the mounted battery pack.

It should be noted that any combination of the above-described constituent elements, and those obtained by converting the expression of the present invention between methods and systems are also effective as aspects of the present invention.

ADVANTAGE OF THE INVENTION According to this invention, the visibility of the light which a light emission part emits favorable compared with the former can be provided.

ADVANTAGE OF THE INVENTION According to this invention, in the charging device which charges the battery pack for electric tools, the charging device which can display the color which was not able to be displayed conventionally can be provided.

ADVANTAGE OF THE INVENTION According to this invention, the highly convenient charging device which has functions other than the charge function with respect to a battery pack can be provided.

1 is a plan view of a charging device 1 according to Embodiment 1 of the present invention. AA sectional drawing of FIG. BB sectional drawing of FIG. CC sectional drawing of FIG. The bottom view of the upper case 3a of the charging device 1. FIG. FIG. 3 is a circuit block diagram of the charging device 1. The display explanatory drawing of charge display LED9 according to the state of the charging device 1. FIG. The time chart of the display form of the battery voltage from the charge start in the charging device 1 to charge completion, charging current, and charge display LED9. 4 is a flowchart of control related to charging in the charging device 1. 4 is a flowchart of control related to USB output in the charging apparatus 1. The combination table | surface of each state and operation | movement form in the charging device 1. FIG. The top view of 1 A of charging devices which concern on Embodiment 2 of this invention. DD sectional drawing of FIG. EE sectional drawing of FIG. The top view of the charging device 1B which concerns on a comparative example. FF sectional drawing of FIG. GG sectional drawing of FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component, member, process, etc. which are shown by each drawing, and the overlapping description is abbreviate | omitted suitably. In addition, the embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

Embodiment 1 FIG. 1 is a plan view of a charging apparatus 1 according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 3 is a cross-sectional view taken along line BB in FIG. 4 is a cross-sectional view taken along the line CC of FIG. FIG. 5 is a bottom view of the upper case 3 a of the charging device 1. The charging device 1 includes a case 3 in which an upper case 3a and a lower case 3b are combined. The upper case 3a and the lower case 3b are, for example, resin molded bodies. A decorative nameplate 16 is provided on the surface (upper surface) of the upper case 3a. In the upper case 3a, the battery pack 13 is detachably mounted (slide mounted) on the battery pack mounting portion 3c. The charging device 1 is connected to an external power source such as a commercial power source by a power cord 19 and charges the attached battery pack 13 with power supplied from the external power source.

As shown in FIG. 2, a main board 4 having a charging function is provided (fixed) in the case 3. The main board 4 is mounted with a transformer 14, a coil 15, and other electronic components (described later in FIG. 6). The circuit on the main board 4 is divided into a primary side circuit (AC voltage side) and a secondary side circuit (charge control side) by the transformer 14, and is preferably insulated from each other.

The upper case 3a is provided with a prism 5 as a light guide. The prism 5 is preferably plate-shaped and is integrally formed with the upper case 3a. An LED substrate 8 as a light emitting unit substrate is fixed to the lower end surface of the prism 5 with screws 12 as fixing members. The fixing of the LED substrate 8 to the prism 5 is not limited to screwing, and may be performed by other methods such as adhesion. The LED board 8 is equipped with a charge display LED 9 as a light emitting unit. The LED board 8 is provided separately from the main board 4. At least a part of the LED board 8 faces the portion of the main board 4 on which the primary circuit is mounted and is connected to the secondary circuit of the main board 4 by the lead wire 10. Has been. The lead wire 10 extends from the LED board 8 and is connected to a connector 11 provided on the main board 4, and has a role of supplying electric power necessary for driving the charging display LED 9 from the main board 4 to the LED board 8. The prism 5 extends from the charging display LED 9 side to the surface (upper surface) side of the upper case 3a, and has a role of guiding light emitted from the charging display LED 9 to the surface side of the upper case 3a. The prism 5 faces the outside (upper side) of the upper case 3a in the vicinity of the edge of the upper case 3a (preferably protrudes from the upper surface of the upper case 3a). That is, the prism 5 protrudes outward from the surface of the upper case 3a, is disposed along the rear edge (inside the upper side in FIG. 1) of the case 3a, and extends in the left-right direction (left-right direction in the figure). It has an elongated shape. The portion of the prism 5 that faces the outside of the upper case 3a is preferably located at a position away from the battery pack 13 attached to the upper case 3a. As shown in FIG. 1, the length L1 of the portion of the prism 5 facing the outside of the upper case 3a is preferably 1/3 or more of the length L2 of one side of the upper case 3a adjacent to the portion. The prism 5 has a light diffusion inclined surface (inclined portion) 6 facing the charging display LED 9 side. In the illustrated example, the light diffusion slope 6 is a triangular notch formed at the center of the lower edge of the prism 5. The light diffusion slope 6 has a role of widely diffusing the light emitted from the charging display LED 9 into the prism 5. The prism 5 has a slit 7 extending so as to cross between the charging display LED 9 and the upper case 3a. The slit 7 penetrates the prism 5 in the thickness direction, and has a role of irregularly reflecting light traveling in the prism 5. The charge display LED 9 is preferably a full-color LED, and includes three LEDs that respectively emit red, green, and blue light in one chip.

As shown in FIG. 1, a USB on / off switch (external power feeding changeover switch) 20 and a USB display LED (power feeding display unit) 21 are provided on the upper surface of the upper case 3 a. Further, a USB output terminal (external power feeding terminal) 22 is provided on the back surface of the case 3. The charging device 1 can supply direct-current power (for example, DC 5V) to an external electric device via the USB output terminal 22. The external power feeding terminal may be a terminal (connector) other than the USB output terminal. The USB on / off switch 20 is a momentary operation type (automatic return type) switch such as a tact switch. The user can switch between enabling and disabling the supply of DC power via the USB output terminal 22 by operating the USB on / off switch 20. The USB display LED 21 is turned on and off every time the user presses the USB on / off switch 20. The lighting and extinguishing of the USB display LED 21 correspond to validity and invalidity of the supply of DC power via the USB output terminal 22, respectively. As shown in FIG. 5, the USB switch board (external power supply switching board) 23 on which the USB on / off switch 20 and the USB display LED 21 are mounted is provided separately from the main board 4, and at least a part thereof is the main board. 4 faces the part on which the primary circuit is mounted.

FIG. 6 is a circuit block diagram of the charging apparatus 1. The charging device 1 converts AC power supplied from an AC power source 18 such as a commercial power source into DC power by an AC / DC converter 30, and charges the attached battery pack 13 and DC power via the USB output terminal 22. Supply. In addition, when the connection with the AC power source 18 is disconnected, the charging device 1 supplies DC power from the battery pack 13 that is mounted to the USB output terminal 22. Details will be described below.

In the charging device 1, the first rectifying / smoothing circuit 31 rectifies and smoothes the input voltage (for example, AC 100 V) from the AC power supply 18. The output voltage of the first rectifying / smoothing circuit 31 is applied to the primary winding of the transformer 14. The switching control circuit 33 performs switching control (for example, PWM control) on a switching element 34 such as FET or IGBT connected in series to the primary winding of the transformer 14. Thereby, an induced electromotive force is generated in the output winding (secondary winding and auxiliary winding) of the transformer 14. The three output voltages of the transformer 14 are input to the second rectifying / smoothing circuit 35, the third rectifying / smoothing circuit 36, and the fourth rectifying / smoothing circuit 37, and are rectified and smoothed. The switching control circuit 33 is activated by the activation current input from the output terminal of the first rectifying / smoothing circuit 31 via the activation resistor 32 and starts the switching control of the switching element 34 when connected to the AC power supply 18. Thereafter, the operation is performed by the supply voltage from the second rectifying / smoothing circuit 35.

The output voltage of the third rectifying / smoothing circuit 36 is input to the positive terminal (C +) of the battery pack 13 via the relay 38 and also input to the DC / DC converter 39 via the diode D1. The output voltage of the battery pack 13 is also input to the DC / DC converter 39 via the power supply switch 41 and the diode D2. The output voltage of the DC / DC converter 39 is output from the USB output terminal 22 to the outside. That is, the third rectifying / smoothing circuit 36 is commonly used for supplying charging power to the battery pack 13 and supplying DC power via the USB output terminal 22.

The battery pack 13 includes a plurality of secondary battery cells 13a such as rechargeable lithium batteries and a protection circuit 13b. The protection circuit 13b monitors the voltage and temperature of each secondary battery cell 13a. When the protection circuit 13b detects battery high temperature or overcharge, the protection circuit 13b notifies the microcomputer 50 as a control unit via the LS terminal. The protection circuit 13b also notifies the microcomputer 50 of the identification information of the battery pack 13 via the T terminal. When the overdischarge or overcurrent is detected, the protection circuit 13b notifies the microcomputer 50 via the LD terminal.

The output voltage of the fourth rectifying / smoothing circuit 37 is stabilized by the constant voltage regulator 42 and supplied to the microcomputer 50. Further, the voltage at the positive terminal of the battery pack 13 is also input to the constant voltage regulator 42 via the power supply switch 41, stabilized by the constant voltage regulator 42, and supplied to the microcomputer 50. The microcomputer 50 performs overall operation control of the charging device 1. Control by the microcomputer 50 will be described later. The current (charging current) supplied from the third rectifying / smoothing circuit 36 to the secondary battery cell 13 a of the battery pack 13 is converted into a voltage by the current detection resistor 40 and input to the current feedback circuit 51. The current feedback circuit 51 transmits current feedback information to the power control signal feedback circuit 55 based on the terminal voltage of the current detection resistor 40 and the charging current setting information from the microcomputer 50. The voltage at the positive terminal of the battery pack 13 is detected by the first voltage detection circuit 52 and fed back to the microcomputer 50. The output voltage of the fourth rectifying / smoothing circuit 37 is detected by the second voltage detection circuit 53 and fed back to the microcomputer 50. The output voltages of the third rectifying / smoothing circuit 36 and the fourth rectifying / smoothing circuit 37 are detected by the voltage feedback circuit 54 and fed back to the power control signal feedback circuit 55. The voltage feedback circuit 54 switches between enabling and disabling the feedback of the output voltage of the third rectifying / smoothing circuit 36 and the fourth rectifying / smoothing circuit 37 according to the voltage feedback switching signal input from the microcomputer 50. The power supply control signal feedback circuit 55 transmits feedback information to the switching control circuit 33 in response to inputs from the current feedback circuit 51 and the voltage feedback circuit 54. The switching control circuit 33 performs switching control of the switching element 34 in accordance with feedback information from the power control signal feedback circuit 55.

FIG. 7 is a display explanatory diagram of the charging display LED 9 according to the state of the charging device 1. FIG. 7 shows eight types of charge states, and the display colors (light emission colors) and display forms (light emission forms) of the charge display LEDs 9 corresponding thereto. The No. 1 standby state (pre-charging state) is a state in which the battery pack 13 is not attached to the charging device 1, the display color of the charging display LED 9 is red, and the display form is blinking. No. 2 to No. 4 are both in a charging state, and are divided into three stages according to the progress of charging. No. 2 is in a state of being charged and less than 50% charged, the display color of the charging display LED 9 is light blue (green + blue), and the display form is blinking with a cycle longer than that of No. 1. No. 3 is in the state of being charged and the amount of charge is 50% to 80%, the display color of the charging display LED 9 is the same as No. 2, and the display form is the same period as No. 2 and the lighting time per time Is a long flashing. No. 4 is in a state of being charged and the amount of charge is 80% or more, the display color of the charge display LED 9 is the same as No. 2 and No. 3, and the display form is lit. No. 5 is a state where charging is completed, the display color of the charging display LED 9 is green, and the display form is lit. No. 6 is a high temperature standby state when the temperature of the battery pack 13 is higher than the threshold value, the display color of the charging display LED 9 is red, and the display form is blinking with a cycle earlier than No. 1. No. 7 is an error state due to an abnormality of the battery pack 13 or the charging device 1 (non-chargeable state), the display color of the charging display LED 9 is purple (red + blue), and the display form has a cycle earlier than that of No. 6. It is flashing. No. 8 is a state in which the charging device 1 is not connected to the AC power source 18, and the charging display LED 9 is turned off.

FIG. 8 is a time chart of the battery voltage, the charging current, and the display form of the charging display LED 9 from the start of charging to the completion of charging in the charging device 1. When charging is started at time t1, the charging current rises and the voltage of the battery pack 13 increases as the charging progresses. Further, the charging display LED 9 operates in the display form of No. 2 in FIG. When charging proceeds and the voltage of the battery pack 13 reaches the predetermined voltage B (corresponding to the charge amount of 50%) at time t2, the charge display LED 9 operates in the display form of No. 3 in FIG. When the charging further proceeds and the voltage of the battery pack 13 reaches the predetermined voltage A (corresponding to the charge amount of 80%) at time t3, the charge display LED 9 operates in the display form of No. 4 in FIG. Further, after time t3, the charging current is decreased stepwise. When the charging is completed at time t4, the charging display LED 9 operates in the display form of No. 5 in FIG.

FIG. 9 is a flowchart of control related to charging in the charging apparatus 1. As a premise of this flowchart, it is assumed that the charging device 1 is connected to the AC power source 18. In the pre-charging state where the battery pack 13 is not attached to the charging device 1 (S1), the microcomputer 50 drives the charging display LED 9 in the display form No. 1 in FIG. 7 (S2). When the battery pack 13 is attached to the charging apparatus 1 (S3, YES), the microcomputer 50 confirms whether the battery pack 13 is abnormal (S4). If the battery pack 13 is normal (S4, YES), the microcomputer 50 checks the temperature of the battery pack 13 (S5). If the battery pack 13 is not in a high temperature state equal to or higher than the predetermined temperature (S5, NO), the microcomputer 50 starts charging the battery pack 13 (S6). Specifically, the microcomputer 50 turns on the relay 38 and applies the output voltage of the third rectifying / smoothing circuit 36 to the battery pack 13 (supplying a charging current from the third rectifying / smoothing circuit 36 to the battery pack 13). The microcomputer 50 continuously monitors the voltage of the battery pack 13 being charged. If the voltage of the battery pack 13 has not reached either of the predetermined voltages A and B (S7, NO, S8, NO), the microcomputer 50 drives the charge display LED 9 in the display form of No. 2 in FIG. S9). When the voltage of the battery pack 13 is less than the predetermined voltage A and equal to or higher than the predetermined voltage B (S7, NO, S8, YES), the microcomputer 50 drives the charge display LED 9 in the display form of No. 3 in FIG. 7 (S10). . When the voltage of the battery pack 13 becomes equal to or higher than the predetermined voltage A (S7, YES), the microcomputer 50 drives the charge display LED 9 in the display form of No. 4 in FIG. 7 (S11). When the charging completion condition is satisfied (S12, YES), the microcomputer 50 stops charging (S13), and drives the charging display LED 9 in the display form No. 5 in FIG. 7 (S14). When the battery pack 13 is removed from the charging device 1 (S15, YES), the microcomputer 50 returns to the pre-charging state shown in step S1. When the microcomputer 50 detects an abnormality of the battery pack 13 in step S4 (S4, NO), the microcomputer 50 drives the charge display LED 9 in the display form of No. 7 in FIG. 7 (S16). When the microcomputer 50 detects that the battery pack 13 is in a high temperature state equal to or higher than the predetermined temperature in step S5 (S5, YES), the microcomputer 50 drives the charge display LED 9 in the display form No. 6 in FIG. 7 (S17).

FIG. 10 is a flowchart of control related to USB output in the charging apparatus 1. The control shown in this flowchart is performed in parallel with the charging control (main control) shown in FIG. When the USB on / off switch 20 is pressed (S21, YES), the microcomputer 50 switches between the USB on mode and the USB off mode. The USB on mode corresponds to the validity of the DC power supply from the USB output terminal 22, and the USB off mode corresponds to the invalidity of the DC power supply. When the microcomputer 50 switches from the USB off mode to the USB on mode (S23, YES), the microcomputer 50 turns on the power supply switch 41 and holds the power supply from the plus terminal of the battery pack 13 to the microcomputer 50 (S24). The microcomputer 50 confirms whether or not an AC voltage is input from the AC power source 18 (S25). If there is an AC voltage input (S25, YES), the display mode of the charging display LED 9 is charged according to the main control shown in FIG. While changing according to the state (S26), the USB display LED 21 is turned on (S27).

If the battery pack 13 is connected to the charging device 1 (S28, YES), and the identification result of the battery pack 13 is normal (S29, YES), the microcomputer 50 is not fully charged ( (S30, NO), it is confirmed whether or not the battery pack 13 is being charged (S31). If the battery pack 13 is being charged (S31, YES), the microcomputer 50 displays the charging display LED 9 during charging (S32), and checks whether the voltage of the battery pack 13 is equal to or higher than a predetermined value (S33). If the battery pack 13 is not being charged in step S31 (S31, NO), the microcomputer 50 skips step S32 and confirms whether the voltage of the battery pack 13 is equal to or higher than a predetermined value (S33). If the voltage of the battery pack 13 is equal to or higher than the predetermined value (S33, YES), the microcomputer 50 sets the DC / DC converter 39 in the driving state and enables the DC power supply from the USB output terminal 22 (S34). On the other hand, if the voltage of the battery pack 13 does not reach the predetermined value in step S33 (S33, NO), the microcomputer 50 stops the DC / DC converter 39 and invalidates the DC power supply from the USB output terminal 22. (S35). When the voltage of the battery pack 13 recovers from less than a predetermined value to a predetermined value or more, the microcomputer 50 switches the DC / DC converter 39 from the stop state to the drive state, and validates the DC power supply from the USB output terminal 22.

If the charging of the battery pack 13 has been completed in step S30 (S30, YES), the microcomputer 50 sets the charging display LED 9 to the charging completion display (S36), sets the DC / DC converter 39 in the driving state, and outputs the USB. The DC power supply from the terminal 22 is validated (S37). If the identification result of the battery pack 13 is not normal in step S29 (S29, NO), the microcomputer 50 displays the charge display LED 9 as an error (S38), stops the DC / DC converter 39, and outputs the USB output terminal. The DC power supply from 22 is invalidated (S39). If the battery pack 13 is not connected to the charging device 1 in step S28 (S28, NO), the microcomputer 50 sets the charge display LED 9 to the standby display (S40), sets the DC / DC converter 39 to the drive state, and turns the USB The DC power supply from the output terminal 22 is validated (S41).

If there is no input of the AC voltage from the AC power source 18 in step S25 (S25, NO), the microcomputer 50 turns off the charging display LED 9 (S42), and the identification result of the battery pack 13 is normal (S43, YES). If the voltage of the battery pack 13 is equal to or higher than the predetermined value (S44, YES), the USB display LED 21 is turned on (S45), and the DC / DC converter 39 is driven to supply DC power from the USB output terminal 22. Enable (S46). On the other hand, if the identification result of the battery pack 13 is not normal in step S43 (S43, NO) and if the voltage of the battery pack 13 does not reach a predetermined value in step S44 (S44, NO), the microcomputer 50 displays the USB. The LED 21 is turned off (S47), the DC / DC converter 39 is stopped, the DC power supply from the USB output terminal 22 is disabled (S48), the power supply switch 41 is turned off, and the microcomputer 50 from the battery pack 13 is turned off. The power supply to is canceled (S49). As a result, the microcomputer 50 stops.

When the microcomputer 50 switches from the USB on mode to the USB off mode in step S23 (S23, NO), the USB display LED 21 is turned off (S50), the DC / DC converter 39 is stopped, and the USB output terminal 22 is turned off. The DC power supply from is invalidated (S51), and the power supply switch 41 is turned off to release the power supply from the battery pack 13 to the microcomputer 50 (S52). Thereafter, if the connection with the AC power supply 18 is valid, the microcomputer 50 continues to be turned on by the power supplied from the AC power supply 18.

FIG. 11 is a combination table of each state and operation mode in the charging apparatus 1. Each state shown in FIG. 11 is based on the case where the USB on / off switch 20 is operated and the DC power supply from the USB output terminal 22 is validated. No. 1 is a normal standby state, the AC power supply 18 is connected, the battery pack 13 is not connected, the DC power supply from the USB output terminal 22 is valid, and the charging display LED 9 is displayed in the display mode 1 (standby) shown in FIG. Display), the USB display LED 21 is lit. No. 2 is a battery high-temperature standby state, the AC power supply 18 is connected, the battery pack 13 is connected, the DC power supply from the USB output terminal 22 is valid, and the charging display LED 9 is displayed in the display mode 6 ( The high temperature standby display) and the USB display LED 21 are lit.

No. 3 is an identification error state of the battery pack 13, the AC power supply 18 is connected, the battery pack 13 is connected, and the DC power supply from the USB output terminal 22 is invalid (however, after the identification error is resolved) (Automatic return), the charging display LED 9 is in the display form 7 (error display) shown in FIG. 7, and the USB display LED 21 is lit. No. 4 is an overdischarge state of the battery pack 13, the AC power supply 18 is connected, the battery pack 13 is connected, and the DC power supply from the USB output terminal 22 is invalid (however, after the overdischarge is eliminated) Auto-recovery), the charging display LED 9 is in the display mode 2 shown in FIG. 7 (displaying charging and less than 50% charge), and the USB display LED 21 is lit. In No. 3 and No. 4, the DC power supply from the USB output terminal 22 is invalid, but the USB display LED 21 is lit.

No. 5 indicates that the battery pack 13 is not being overdischarged and is in a fully charged state, the AC power supply 18 is connected, the battery pack 13 is connected, the DC power supply from the USB output terminal 22 is valid, and the charging indicator LED 9 Is one of the display modes 2 to 5 shown in FIG. 7 (charging or charging completion display), and the USB display LED 21 is lit. In No. 5, when the connection with the AC power source 18 is disconnected, the process proceeds to No. 6 described later. No. 6 is that the AC power supply 18 is not connected, the battery pack 13 is connected, the DC power supply from the USB output terminal 22 is valid, the charging display LED 9 is off, the USB display LED 21 is on, and the power of the battery pack 13 is In this state, DC power is supplied to the USB output terminal 22. No. 7 is no AC power supply 18 connected, battery pack 13 is connected, battery pack 13 is in an overdischarged state, DC power supply from USB output terminal 22 is disabled, charging display LED 9 is turned off, and USB display LED 21 is turned off. In this state, DC power is not supplied to the USB output terminal 22. In No. 7, when the charging apparatus 1 is connected to the AC power source 18, the process proceeds to No. 4.

According to the present embodiment, the following effects can be achieved.

(1) Since the prism 5 faces the outer side (upper side) of the upper case 3a in the vicinity of the edge of the upper case 3a, the prism 5 faces the outer side of the upper case 3a at the center of the upper case 3a as in a comparative example described later. Compared to the case, the range in which the prism 5 is hidden behind the battery pack 13 can be reduced, and the visibility of the prism 5 and thus the visibility of the light emitted from the charge display LED 9 led to the prism 5 is improved. .

(2) Since the portion of the prism 5 that faces the outside of the upper case 3a is located away from the battery pack 13 attached to the upper case 3a as compared with the same portion in a comparative example described later, the prism 5 is connected to the battery. The range hidden behind the pack 13 can be reduced, and the visibility of the prism 5 and thus the visibility of the light emitted from the charge display LED 9 led to the prism 5 are improved.

(3) Since the length L1 of the portion of the prism 5 facing the outside of the upper case 3a is not less than 1/3 of the length L2 of one side of the upper case 3a adjacent to the portion, Thus, compared with the case where the prism 5 is cylindrical, the light emitted from the charging display LED 9 is diffused over a wide area on the surface of the upper case 3a by the prism 5, and the visibility of the light emitted from the charging display LED 9 is better. It becomes.

(4) Since the LED board 8 is provided separately from the main board 4, the degree of freedom of arrangement of the charging display LED 9 is increased. For this reason, for example, the charge display LED 9 can be disposed under a position with good visibility on the surface of the upper case 3a, such as on the portion of the main board 4 where the primary circuit is mounted, and the charge display LED 9 emits light. The visibility of light can be improved. In addition, the dead space in the case 3 can be effectively used, and the prism 5 can be enlarged, and the visibility of the light emitted from the charge display LED 9 can be improved. Further, since the main board 4 does not need to have the function of the LED board 8, the main board 4 can be efficiently wired, which is advantageous for downsizing the main board 4.

(5) Since the LED board 8 is connected to the secondary circuit of the main board 4 by the lead wire 10, it is not necessary to provide a separate power source for supplying power to the LED board 8, and the increase in the number of components is suppressed. it can.

(6) Since the LED substrate 8 is fixed to the prism 5, no contrivance for fixing the LED substrate 8 is required on the case 3 side, and the complexity of the shape of the case 3 can be suppressed.

(7) Since the prism 5 has a plate shape extending from the charge display LED 9 side to the surface of the upper case 3a and has the light diffusion slope 6 facing the charge display LED 9 side, the light emitted from the charge display LED 9 is diffused over a wide range. The visibility of the light emitted from the charging display LED 9 is improved.

(8) Since the prism 5 has the slit 7 extending so as to cross between the charging display LED 9 and the upper case 3a, the light of the charging display LED 9 traveling in the prism 5 is irregularly reflected by the slit 7, and the charging display LED 9 The emitted light is diffused in a wide range, and the visibility of the light emitted from the charge display LED 9 is improved.

(9) Since the prism 5 is integrally formed with the upper case 3a, it is necessary to provide a screw hole, a screw seat or the like on the upper case 3a side as compared with the case where the prism 5 is fixed to the upper case 3a by screwing or the like. In addition, it is advantageous for space saving and the degree of freedom of arrangement of the prism 5 is increased.

(10) Since the charging display LED 9 includes a blue LED, it is possible to display a color that could not be conventionally displayed as a charging device for charging a battery pack for an electric tool.

(11) Since the charging display LED 9 is a full-color LED, it can emit various types of colors as compared with the conventional case. For this reason, the common charge display LED 9 and the prism 5 display a plurality of stages of charging progress and charging states other than the charging progress (pre-charging state, charging completion state, battery high temperature standby state, unchargeable state, etc.). It becomes possible.

(12) Since the DC power can be supplied from the USB output terminal 22 by using the power of the AC power supply 18 or the battery pack 13, it is more convenient than the charging device having only the charging function of the battery pack 13. Can be increased.

(13) The USB on / off switch 20 can be switched between valid and invalid of the DC power supply via the USB output terminal 22, so that it is easy to use.

(14) Since the USB switch board 23 on which the USB on / off switch 20 and the USB display LED 21 are mounted is provided separately from the main board 4, the degree of freedom of arrangement of the USB on / off switch 20 and the USB display LED 21 is high. .

(15) Since the USB display LED 21 is provided separately from the charging display LED 9, the display regarding independent functions is separated from each other, and is easy for the user to understand.

(16) If the connection between the charging device 1 and the AC power supply 18 is disconnected while the DC power is supplied from the USB output terminal 22 by the power of the AC power supply 18, the USB output terminal 22 is supplied by the power of the battery pack 13. Since it is automatically switched on the charging device 1 side so as to supply DC power from the power source, it is easy to use.

(17) Since the third rectifying / smoothing circuit 36 is shared for supplying charging power to the battery pack 13 and supplying DC power via the USB output terminal 22, an increase in the number of circuit components can be suppressed. Here, when the voltage of the battery pack 13 is equal to or lower than a predetermined value (when the battery pack 13 is overdischarged), the microcomputer 50 disables the supply of DC power via the USB output terminal 22, so that the DC / DC converter 39 is prevented from malfunctioning due to the low input voltage from the battery pack 13.

Embodiment 2 FIG. 12 is a plan view of a charging device 1A according to Embodiment 2 of the present invention. 13 is a cross-sectional view taken along the line DD of FIG. 14 is a cross-sectional view taken along line EE in FIG. In charging apparatus 1A of the present embodiment, prism 5 is arranged along an edge of upper case 3a different from that of the first embodiment. That is, the prism 5 has an elongated shape along the front-rear direction of the upper case 3a (vertical direction in FIG. 12), and is disposed along the left edge of the upper case 3a. Other points of the present embodiment are the same as those of the first embodiment. The present embodiment can achieve the same effects as those of the first embodiment.

Comparative Example FIG. 15 is a plan view of a charging device 1B according to a comparative example. 16 is a cross-sectional view taken along line FF in FIG. 17 is a cross-sectional view taken along the line GG in FIG. Unlike the embodiment, the charging device 1B of this comparative example has two charging display LEDs 9, each provided in a secondary circuit on the main board 4, and the prism 5 is cylindrical. Each charging display LED 9 extends upward. As shown in this comparative example, when the charging display LED 9 is arranged on the main board 4, even if the charging display LED 9 is arranged closer to the primary circuit, the prism 5 extending upward from the charging display LED 9 side is It faces the outside of the upper case 3a just beside the battery pack 13, and is often hidden behind the battery pack 13 and has poor visibility. On the other hand, in the above-described embodiment, such a visibility problem can be preferably solved.

The present invention has been described above by taking the embodiment as an example. However, it is understood by those skilled in the art that various modifications can be made to each component and each processing process of the embodiment within the scope of the claims. By the way. The prism 5 may be arranged along the lower edge of FIG. Although the prism 5 has been described as an elongated shape, the shape is not limited as long as it is a shape that protrudes outward from the upper surface of the case 3 (upper case 3a) and extends along the upper surface, such as a circular shape or a square shape. .

DESCRIPTION OF SYMBOLS 1 ... Charging device, 3 ... Case, 3a ... Upper case (upper outer frame), 3b ... Lower case (lower outer frame), 4 ... Main board, 5 ... Prism (light guide), 6 ... Light diffusion slope (inclination) Part), 7 ... slit, 8 ... LED substrate (light emitting part substrate), 9 ... charge indicator LED (light emitting part), 10 ... lead wire, 11 ... connector, 12 ... screw (fixing member), 13 ... battery pack, 13a ... secondary battery cell, 13b ... protection circuit, 14 ... transformer, 15 ... coil, 16 ... decoration nameplate, 18 ... alternating current power supply, 19 ... power cord, 20 ... USB on / off switch (external power supply switch), 21 ... USB display LED (display unit for power supply), 22 ... USB output terminal (external power supply terminal), 23 ... USB switch board (external power supply switching board), 30 ... AC / DC converter, 31 ... first rectifying and smoothing circuit, 32 ... Starting resistance, 3 DESCRIPTION OF SYMBOLS ... Switching control circuit, 34 ... Switching element, 35 ... 2nd rectification smoothing circuit, 36 ... 3rd rectification smoothing circuit, 37 ... 4th rectification smoothing circuit, 38 ... Relay, 39 ... DC / DC converter, 40 ... Current detection resistance , 41 ... power supply switch, 42 ... constant voltage regulator, 50 ... control unit, 51 ... current feedback circuit, 52 ... first voltage detection circuit, 53 ... second voltage detection circuit, 54 ... voltage feedback circuit, 55 ... power supply control Signal feedback circuit

Claims (12)

A case for detachably attaching the battery pack;
A light emitting part provided in the case;
A light guide that guides the light emitted from the light emitting unit to the surface side of the case, and
The light emitting unit includes a plurality of LEDs,
The light guide is a single plate-like member extending from the light emitting unit side to the surface side of the case,
The light guide body, for the a slit extending transversely to the longitudinal direction of the light guide, the light diffusing facing the extraordinary look the plurality of LED to the light-emitting portion side between the light emitting portion surface of the case It has a slope portion, a charging device. The charging device according to claim 1, wherein the light guide is integrally formed with the case. The light emitting unit, viewed contains a blue LED, a red LED and a green LED,
The charging device according to claim 1 or 2 , wherein a plurality of stages of charging progress and a charging state other than the charging progress are displayed by the common light emitting unit and the light guide .   The said light emission part is a charging device of Claim 3 comprised including blue LED, red LED, and green LED in one chip | tip. 5. The charging according to claim 1 , wherein the light guide body protrudes outward from an upper surface of the case and extends along the upper surface at a position separated from a battery pack attached to the case. apparatus. The charging device according to claim 5 , wherein a length of a portion of the light guide facing the outside of the case is 1/3 or more of a length of one side of the case adjacent to the portion. The charging device according to any one of claims 1 to 6 , wherein a light emitting unit substrate on which the light emitting unit is mounted is provided separately from a main substrate having a charging function in the case. The charging device according to claim 7 , wherein the light emitting unit substrate is fixed to the light guide. The charging device according to claim 7 or 8 , wherein at least a part of the light emitting unit substrate is located at a position facing a portion of the main substrate on which a primary circuit is mounted. The light emitting portion substrate, said are connected by a secondary-side circuit and the leads of the main board, the charging device according to any one of claims 7 9. And external external power supply terminal capable of supplying DC power to the electrical device, and a power supply display section for the supply of DC power via the external power supply terminal, to any one of claims 1 to 10 The charging device described. Provided with an external power supply changeover switch for switching validity / invalidity of the supply of DC power via the external power supply terminal, and the external power supply changeover board mounted with the external power supply changeover switch and the power supply display unit has a charging function The charging device according to claim 11 , wherein the charging device is provided separately from a main board having

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