KR0161041B1 - Charging apparatus of electric shaver - Google Patents

Abstract

The present invention relates to a charging device for an electric shaver, the first rectifying means for rectifying the commercial AC power from the AC power input terminal to a DC voltage, and to receive the DC voltage output from the first rectifying means to charge the storage battery Switching control means for controlling the oscillation of the switching transformer, second rectifying means for rectifying the voltage induced on the secondary side of the switching transformer oscillated under the control of the switching control means to a voltage necessary for charging the storage battery, and An electric shaver having display means for displaying a state of charge, comprising: an overvoltage detector for detecting a voltage applied to a storage battery by receiving a DC voltage output from the second rectifying means; and a DC voltage output from the second rectifying means. A temperature sensing unit for sensing the temperature of the storage battery and a temperature sensing day from the temperature sensing unit And a charging control unit for receiving the voltage sensing data from the overvoltage sensing unit and controlling the rapid charging of the storage battery, the charging control unit according to the temperature sensed by the temperature sensing unit and the voltage sensed by the overvoltage sensing unit. Receiving a control signal to start the rapid charging to the battery, the charging start unit, the over-current detecting unit for detecting the charging current of the battery, and the resistance (R23) for adjusting the charging time by limiting the charging current input to the battery Characterized in that made.

Description

Charging device of electric shaver

1 is a control block diagram of a conventional electric shaver.

2 is a control block diagram of a charging device for an electric shaver according to an embodiment of the present invention.

3 is a detailed circuit diagram of a charging device for an electric shaver according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: AC power input plate 10: First rectifying means

12 bridge rectifier 13 filter unit

20: switching control means 21: switching control unit

22: snubber circuit part 23: frequency setting part

24: voltage detector 25: current detector

30: second rectifying means 40: charging control means

41: storage battery 42: overvoltage detection unit

43: temperature detection unit 44: charge control unit

45: charging start 50: display means

60: switch means 61: motor

The present invention relates to a charging device for an electric shaver that can safely and rapidly charge a removable battery in addition to the battery built in the electric shaver.

In general, when the conventional electric shaver is connected to the AC power input terminal 1, as shown in FIG. 1, a commercial AC power supply from the AC power input terminal 1 is rectified. 5) is rectified to a DC voltage and applied to the switching control unit 21.

At this time, the switching controller 21 receives the DC voltage from the rectifying means 5 to oscillate the switching transformer 26 to start charging the storage battery 41.

When the battery 41 starts to be charged with power, the switching controller 21 continuously detects the amount of charge of the battery 41, and when charging is completed after a predetermined time, the oscillation operation of the switching transformer 26 is stopped. Stopping and preventing overcharging of the storage battery 41 and displaying through the display means 50 that the charging is completed so that the user can easily check.

At this time, when the user operates the switch unit 62, the power charged in the storage battery 41 is applied to the motor 61 to drive the motor 61 to shave.

In addition, when the power consumption of the battery 41 is exhausted, the above operation may be repeated to perform shaving or to directly connect the power plug to the AC power input terminal 1 to operate the switch 62. When the AC power is supplied from the AC power input terminal 1 to the motor 61, the motor 61 is driven to shave.

However, such a conventional electric shaver does not have a built-in charging circuit capable of charging the battery within a short time (approximately, about 1 hour) or even if the charging circuit is built in, the overvoltage and abnormal temperature of the battery at the beginning of charging. Since the abnormal state of the battery can not be detected due to overheating, leakage, and non-charging of the battery, the performance of the battery is degraded, and the user's reliability of the product is not satisfied, and it is inconvenient to use. There was a problem.

Therefore, the present invention has been made to solve the above problems, an object of the present invention is to detect the temperature and voltage of the battery during the initial charge only when the battery is in a normal state for a short time (for example, about 30 minutes It is convenient to use by charging the battery, while not only satisfying the user's reliability for the product by protecting the performance of the battery, but also easily adjusting the charging time of the battery according to the charge current limiting resistance. An object of the present invention is to provide a charging device for an electric razor, which can broaden the selection range.

Another object of the present invention is to provide a charging device for an electric shaver, which enables a user to easily check the state of charge of the battery by lighting different lamps at the time of charging the battery and completing the charging using the display means.

In order to achieve the above object, the apparatus for charging an electric shaver according to the present invention includes a first rectifying means for rectifying a commercial AC power supply from an AC power input terminal with a DC voltage, and a DC voltage output from the first rectifying means. Switching control means for controlling oscillation of the switching transformer to charge the storage battery, second rectifying means for rectifying the voltage induced on the secondary side of the switching transformer oscillating under the control of the switching control means to a voltage necessary for charging the storage battery; And an electric shaver having display means for displaying the state of charge of the battery, wherein the overvoltage detecting unit receives a direct current voltage output from the second rectifying means and detects a voltage applied to the battery, from the second rectifying means. A temperature sensing unit for sensing the temperature of the battery by receiving an output DC voltage and the temperature sensing unit A charge control unit that receives the temperature sensing data of the sensor and the voltage sensing data from the overvoltage sensing unit, and controls the rapid charging of the storage battery, a temperature sensed by the temperature sensing unit, and a voltage sensed by the overvoltage sensing unit. The charging start unit receives the control signal from the charge control unit and starts the rapid charging of the battery, an overcurrent detector for detecting the charging current of the battery, and the charging current input to the battery to limit the charging time It is characterized by consisting of a resistor (R23).

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

As shown in Figs. 2 to 3, the first rectifying means rectifies the commercial AC power supply from the AC power supply input terminal 1 with a DC voltage. The first rectifying means is a power plug (not shown). Resistor (FR, R1) for limiting inrush current generated when the AC power input terminal 1 is connected or disconnected, and a temperature fuse 11 for shutting off the power to protect the device in case of abnormal temperature in the electric shaver. And a varistor (V1) which prevents surge voltage generated when the AC power input from the AC power input terminal (1) is input, and noise components included in the AC power input from the AC power input terminal (1). A capacitor C1 connected in parallel to the varistor V1, a bridge rectifier 12 for full-wave rectifying an AC voltage from which noise components are removed by the capacitor C1, and a bridge rectifier 12 from the bridge rectifier 12; Title To filter out the ripple components included in the voltage is composed of a filter section 13 connected to the output terminal of the bridge rectifier (12).

The filter unit 13 includes a discharge resistor R2 and a smoothing capacitor C3 connected at one side thereof to the bridge rectifier 12 so as to increase rectification efficiency of the bridge rectifier 12, and a switching transformer to be described later. It consists of a choke coil (L1) and a capacitor (C2) for filtering the noise component in order to prevent the noise generated during the oscillation is emitted along the input line to the outside.

The switching control means 20 controls the oscillation of the switching transformer 26 to charge the storage battery 41 by receiving the DC voltage output from the first rectifying means 10, thereby switching control means. 20 is a switching control unit 21 for controlling the oscillation of the switching transformer 26 by receiving the DC voltage output from the first rectifying means 10, and the switching transformer 26 by the control of the switching control unit 21. Snubber circuit portion 22 composed of resistors R3 and R4, capacitors C4 and C5, and diode D1 to remove the spike voltage and noise components generated at the time of oscillation. And a frequency setting unit 23 including capacitors C6, C7, and C8 to set the switching frequency of the switching transformer 26 oscillated under the control of the switching controller 21, and the switching transformer 26 of the switching transformer 26. Switched by applying induced voltage to secondary side A voltage sensing unit 24 for detecting an overvoltage generated when the transformer 26 is oscillated and a DC current output from the first rectifying means 20 to detect an overcurrent generated when the switching transformer 26 is oscillated. It is comprised by the current detection part 25.

The voltage sensing unit 24 includes a diode D4 for half-wave rectifying the voltage induced on the secondary side 262 of the switching transformer 26 when the switching transformer 26 is oscillated, and half-wave rectifying the diode D4. A bypass capacitor CIO for bypassing the AC component contained in the received voltage, voltage divider resistors R9 and R10 for dividing the DC voltage bypassed by the capacitor C10, and the voltage divider resistor R9. And a resistor (R8) and a capacitor (C9) for receiving a signal divided by R10 to generate a square wave.

The second rectifying means 30 receives the voltage from the secondary side 261 of the switching transformer 26 of the switching control means 20 and rectifies the DC voltage necessary for charging the storage battery 41. The second rectifying means 30 includes a diode D2 for half-wave rectifying the voltage induced on the secondary side 261 of the switching transformer 26 when the switching transformer 26 is oscillated, and a half wave at the diode D2. It is composed of a choke coil (L2) and capacitors (C11, C12) for filtering the noise components of the high frequency and low frequency contained in the rectified voltage.

In addition, the charging control means 40 charges the storage battery 41 by receiving a DC voltage output from the second rectifying means 30, and the charging control means 40 supplies the second rectifying means 30. The overvoltage detecting unit 42 comprising the resistors R11, R14, and R15 and the capacitor C13 to receive the DC voltage output from the capacitor and sense the voltage applied to the battery 41, and the second rectifying means 30. A temperature sensing unit 43 made up of a thermistor TH and a resistor R24 to receive a DC voltage output from the battery 41 and a temperature sensing data and an overvoltage from the temperature sensing unit 43. The charging controller 44 which receives the voltage sensing data from the sensing unit 42 and controls the rapid charging of the storage battery 41, and the storage battery 41 sensed by the temperature sensing unit 43 and the overvoltage sensing unit 42. Control signal from the charging control unit 44 according to the temperature and voltage of Arthur battery 41, the on-off start to turn on / off to start the rapid charging, and the over-current detecting unit 46 consisting of a resistor (R16) and a capacitor (C14) to sense the charging current of the battery (41). ) And a resistor R23 connected to the storage battery 41 to arbitrarily adjust the charging time by limiting the charging current input to the storage battery 41.

The charging start unit 45 receives a control signal from the charging control unit 44 through a resistor R13 and prevents a leakage current when the transistor TR1 is turned on or off and the transistor TR1 is turned on. The resistor R12 includes one end connected to the emitter terminal of the transistor TR1 and the other end connected to the base terminal.

In addition, the display means 50 displays the state of charge of the storage battery 41 under the control of the charge control means 40. The display means 50 is a charge control part of the charge control means 40. Transistor TR2, which is turned on by receiving the low level control report output from 44 through the voltage divider R18 and R19, and displays the state of charge of the storage battery 41 when the transistor TR2 is turned on. When the red lamp LP1 is turned on, the zener diode ZD bypasses only a predetermined breakdown voltage by receiving a high level control signal output from the charging control unit 44 and the zener diode ZD is turned on. Transistor TR3, which is turned on by receiving a high level control signal output from the charge controller 44 through the resistor R22, and displays a charging completion state of the storage battery 41 when the transistor TR3 is turned on. To the green lamp (LP2) Consists of.

In addition, in the drawing, the switch means 60 receives the power charged in the battery 41 and the commercial AC power from the AC power input terminal 1 to start the operation of the electric shaver to drive the motor 61. The switch means 60 is adapted to remove the instantaneous noise generated at the time of switching on and off of the switch section 62 which is turned on / off to start the operation of the electric shaver. It is comprised by the capacitor C15 connected to the said switch part 62.

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

First, when a power plug (not shown) is connected to the AC power input terminal 1 (for example, an outlet), the inrush current generated when the power plug is connected to the AC power input terminal 1 is the resistance (FR, R1). Commercial AC power from the AC power input terminal 1 is applied to the bridge rectifier 12 while being removed through the AC power input terminal 1.

Accordingly, the bridge rectifier 12 receives the commercial AC power supplied from the AC power input terminal 1 to perform full-wave rectification by direct current, and converts the full-wave rectified DC voltage into the switching control unit 21 and the switching control means 20. It outputs to the snubber circuit part 22, and the filter part 13 prevents the noise which generate | occur | produces at the time of oscillation of the switching transformer 26 from being emitted to the exterior along an input line.

This is because the noise emitted to the outside affects the peripheral device.

At this time, the current sensing unit 25 uses the DC voltage ground level, which is full-wave rectified, to the bridge rectifier 12 to output the DC voltage output from the output terminal O3 of the switching control unit 21 to the voltage divider R6. It divides and outputs in R7).

Accordingly, the switching control unit 21 senses the current input to the load according to the change in the divided voltage generated from the current sensing unit 25 while the full-wave rectified input voltage by the bridge rectifier 12 is overvoltage, It is determined whether it is abnormal or normal due to overcurrent, abnormal temperature and undervoltage.

As a result of the determination, when the input voltage full-wave rectified by the bridge rectifier 12 is a normal condition, the switching controller 21 switches the switching frequency set by the capacitors C6, C7, and C8 of the frequency setting unit 23. As a result, the control signal is output to the snubber circuit unit 22 through the output terminal O1 so that the switching transformer 26 oscillates.

At this time, the snubber circuit unit 22 attenuates spike voltage and noise components generated when the switching transformer 26 is oscillated so that the switching controller 21 operates safely.

On the other hand, the voltage induced on the secondary side 262 of the switching transformer 26 at the time of oscillation of the switching transformer 26 is half-wave rectified by the diode D4 of the voltage sensing unit 24 while the divided resistors R9 and R10 are applied. Partial pressure through.

At this time, the resistor R8 and the capacitor C9 receive the signals divided by the divided resistors R9 and R10 to generate a square wave and output the square wave to the switching controller 21.

Accordingly, the switching control unit 21 receives the square wave generated by the resistor R8 and the capacitor C9 of the voltage sensing unit 24 at the time of oscillation of the switching transformer 26 to the voltage sensing unit 24. It is determined whether the detected voltage is an overvoltage.

As a result of the determination, when the voltage induced on the secondary side 262 of the switching transformer 26 is an overvoltage, the switching control unit 21 controls the switching transformer 26 to stop oscillation, and is a normal voltage instead of an overvoltage. In case of, the switching control unit 21 controls the switching transformer 26 to continue oscillation.

The voltage induced at the secondary side 261 of the switching transformer 26 at the time of oscillation of the switching transformer 26 is half-wave rectified by the diode D2 of the second rectifying means 30, and the half-wave rectified voltage. The noise component included in is filtered through the choke coil L2 and the capacitors C11 and C12 and input to the charging control means 40.

Therefore, the temperature sensing unit 43 of the charging control unit 40 receives the DC voltage output from the second rectifying unit 30 to sense the temperature of the battery 41 according to the overcurrent applied to the battery 41. To the charging control unit 44.

On the other hand, the overvoltage detecting unit 42 of the charging control means 40 receives the DC voltage output from the second rectifying means 30 to sense the voltage applied to the storage battery 41, the charging control unit 44 Output to

Accordingly, the charge control unit 44 receives the temperature sensing data of the storage battery 41 output from the temperature sensing unit 43 before rapidly charging the storage battery 41 and from the overvoltage sensing unit 42. The voltage of the storage battery 41 and the voltage applied to the storage battery 41 according to the overcurrent applied to the storage battery 41 by receiving the voltage sensing data of the output storage battery 41 are preset in the charging control unit 44. Determine if it is within the operating range (normal voltage, normal temperature).

If the charging controller 44 determines that the temperature of the battery 41 according to the overcurrent applied to the battery 41 is an abnormal temperature or the voltage applied to the battery 41 is an abnormal state in which the voltage is overvoltage, the charging is performed. The control unit 44 outputs a high level control signal to the charging start unit 45 through the output terminal O1 to turn off the transistor TR1 of the charging start unit 45.

When the transistor TR1 is turned off, since the DC voltage output from the second rectifying means 30 is not applied to the storage battery 41, the storage battery 41 is not charged.

On the other hand, when the determination result of the charge control unit 44, when the temperature of the battery 41 according to the current applied to the battery 41 is determined that the normal temperature and the voltage applied to the battery 41 is a normal voltage is a normal state The transistor TR1 of the charging start unit 45 is turned on by outputting a low level control signal to the charging start unit 45 through the output terminal O1.

When the transistor TR1 is turned on, a direct current voltage output from the second rectifying means 30 is applied to the storage battery 41 through the diode D3, and at this time, the charge time adjusting resistor connected to the storage battery 41 ( By setting the resistance value of R23 low to increase the charging current input to the battery 41, the charging time is shortened (e.g., 30 minutes), and rapid charging of the battery 41 is performed.

At this time, the charging control unit 44 outputs a low level control signal to the display means 50 through the output terminal (02).

Accordingly, the red lamp LP1 is turned on by the transistor TR2 of the display means 50 being turned on by receiving the low level control signal output from the charge controller 44 through the voltage divider R18 and R19. do.

Therefore, the user can see the red lamp LP1 lit on the display means 50 to confirm that the storage battery 41 is in a charged state.

At this time, the overcurrent detecting unit 46 of the charging control means 40 continuously detects the charging current of the storage battery 41, and when an overcurrent exceeding the charging current set in the charging control unit 44 flows, the battery 41 is protected. In order to output the overcurrent detection signal to the charge control unit 44.

Accordingly, the charge control unit 44 outputs a high level control signal to the charge start unit 45 through the output terminal O1, thereby turning off the transistor TR1 of the charge start unit 45 while the storage battery is turned off. The battery 41 is protected since the rapid charging of the battery 41 is stopped.

In addition, the charge control unit 44 continuously detects an abnormal state according to the voltage drop, the overvoltage, and the abnormal temperature of the battery 41 during the rapid charging of the battery 41 through the input terminals 11 and 12. It is detected whether charging of the storage battery 41 is completed.

When the battery 41 is charged after a predetermined time has elapsed, the charging control unit 44 outputs a high level control signal to the charging start unit 45 through the output terminal O1 to allow the charging start unit ( As the transistor TR1 of 45 is turned off, rapid charging of the storage battery 41 is stopped.

In addition, the charging control unit 44 outputs a high level control signal to the display means 50 through the output terminal O2.

Accordingly, while the zener diode ZD of the display means 50 is turned on, a high level control signal output from the charging control unit 44 is applied to the transistor TR3 through the resistor R22, thereby transmitting the transistor TR3. ) Turns on and the green lamp (LP2) lights up.

Therefore, the user can easily check that the battery 41 is fully charged, that is, a full state, by looking at the green lamp LP2 that is turned on the display means 50.

At this time, the resistance R23 of the charging control means 40 sets the charging current input to the storage battery 41. When the resistance value of the resistor R23 is low, the charging current increases, so that the charging time is increased. Shorten.

On the other hand, when the resistance value of the resistor R23 is large, the charging current is small and the charging time is long.

In this way, the rapid charging time of the storage battery 41 can be arbitrarily adjusted according to the resistance value of the resistor R23.

On the other hand, when the charging of the battery 41 is completed, if the power plug is connected to the AC power input terminal 1 as it is, the charge control unit 44 is a predetermined current by the natural discharge of the battery 41, the battery 41 Will continue to supply Tricool charging.

On the other hand, when the charging of the storage battery 41 is completed and the power plug is removed from the AC power input terminal 1, all the functions of the charging control unit 44 are turned off.

In this case, when the user wants to use the electric shaver, when the switch unit 62 of the switch means 60 is turned on, the power charged in the storage battery 41 is applied to the motor 61 while the motor 61 is applied. It can be driven to shave.

In addition, when the battery 41 is exhausted, the above operation is repeated to rapidly charge the battery 41 and then turn on the switch 62 or turn the power plug into the AC power input terminal. When the switch unit 62 is turned on after being connected to (1), commercial AC power from the AC power input terminal 1 is applied to the motor 61 to drive the motor 61 to shave. do.

According to the charging apparatus of the electric shaver according to the present invention as described above, by sensing the temperature and voltage of the battery in the initial stage of charging, the battery is charged within a short time (for example, about 30 minutes) only in a steady state. It is easy to use and protects the performance of the battery, which not only satisfies the user's reliability of the product, but also makes it easy to adjust the charging time of the battery according to the charge current limiting resistance. There is an effect that can be widened, and by using a display means to light up the respective lamps at the time of charging and completion of charging the battery has an excellent effect that the user can easily check the state of charge of the battery.

Claims (4)

A first rectifying means for rectifying commercial AC power from an AC power input terminal into a DC voltage, a switching control means for controlling oscillation of a switching transformer to receive a DC voltage output from the first rectifying means to charge a storage battery; An electric shaver having second rectifying means for rectifying the voltage induced on the secondary side of the switching transformer oscillating under the control of the switching control means to a voltage necessary for charging the battery, and a display means for displaying the state of charge of the battery. An overvoltage sensing unit configured to sense a voltage applied to a storage battery by receiving a DC voltage output from the second rectifying unit, and a temperature sensing unit sensing a temperature of the storage battery by receiving a DC voltage output from the second rectifying unit. And temperature sensing data from the temperature sensing unit and voltage sensing data from the overvoltage sensing unit. Receiving a control signal from the charge control unit according to the charge control unit for controlling the rapid charging of the battery and the temperature sensed by the temperature sensing unit and the voltage sensed by the overvoltage sensing unit to start the rapid charging of the battery. Charging start unit, the over-current detecting unit for detecting the charging current of the battery and the charging device of the electric shaver, characterized in that consisting of a resistor (R23) for adjusting the charging time by limiting the charging current input to the battery. The switching control unit of claim 1, wherein the switching control unit receives a DC voltage output from the first rectifying unit to control oscillation of the switching transformer, and removes spike voltage and noise components generated during oscillation of the switching transformer. A snubber circuit unit for protecting the switching control unit, a frequency setting unit for setting a switching frequency of the switching transformer oscillating under the control of the switching control unit, and an induced voltage applied to the secondary side of the switching transformer when oscillating the switching transformer And a voltage sensing unit for sensing an overvoltage occurring in the circuit, and a current sensing unit for sensing an overcurrent generated when the switching transformer is oscillated by receiving a DC voltage output from the first rectifying unit. Device. 2. The display device according to claim 1, wherein the display means comprises a transistor which is turned on by receiving a low level control signal output from the charge control unit, a red lamp which displays a state of charge of the battery when the transistor is turned on, and the charge control unit from the charge control unit. A zener diode that receives an output high level control signal and bypasses only a predetermined breakdown voltage, a transistor that is turned on by receiving a high level control signal output from the charging control unit when the zener diode is turned on, and the transistor is turned on And a green lamp for indicating a charging completion state of the storage battery. 3. The voltage sensing unit of claim 2, wherein the voltage sensing unit bypasses a diode half-wave rectified at the secondary side of the switching transformer when the oscillation of the switching transformer and an AC component included in the half-wave rectified voltage at the diode. An electric shaver comprising a pass capacitor, a voltage divider for dividing a DC voltage bypassed by the capacitor, a resistor for generating a square wave by receiving a signal divided by the voltage divider, and a capacitor. Charging device.