JPH0223064Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a charging device for devices such as rechargeable electric razors and electric hair clippers that can be used with either storage batteries or AC power supplies.Charging is completed when the terminal voltage of the storage battery is detected and reaches a set level. An object of the present invention is to provide a charging device that detects and displays.

The charging completion display prevents deterioration of the storage battery due to overcharging and also prevents consumption of reactive power.

Conventionally, the completion of charging has been indicated by using light such as a flashing light emitting element such as a light emitting diode, or by using a sound such as a buzzer. The sound notification method is a display method that allows the user to know that charging is complete even if the device is out of the user's field of vision. This method of notifying the completion of charging using this sound detects the terminal voltage of the storage battery. When the terminal voltage of the storage battery reaches a set level, the oscillation operation of the transistor inverter is stopped, and the voltage of the storage battery decreases when charging is stopped. The transistor inverter again enters into oscillation operation and charging is performed. By repeating this process, large current charging changes to small current charging. Charging completion uses a signal that stops this transistor inverter.
This signal becomes pulsed due to the repeated turning on and off of the transistor inverter. This signal is used as a trigger signal to operate a buzzer drive circuit using a time constant of a resistor and a capacitor to drive the buzzer intermittently, and to notify the completion of charging with a sound.

In recent years, LSI technology has made remarkable progress, and melody
ICs and voice synthesis ICs have been commercialized. If such technology is used for charging completion display, information transmission and effectiveness will be enhanced, charging completion display will be more reliable, and added value will increase.

However, since the signal for stopping the transistor inverter is used to indicate the completion of charging, the signal is pulsed, which is convenient for intermittent notifications, but not for continuous notifications.

The present invention is intended to eliminate this drawback, and its purpose is to complete charging using melody and voice synthesis.

The gist of the present invention is to provide a storage battery, a charging means for charging the storage battery with an output rectified current of a transistor inverter, a battery voltage detection means for detecting the voltage of the storage battery, and a terminal voltage of the storage battery that reaches a set level. charging control means for controlling the charging means according to the detection output of the battery voltage detection means at the time of charging; and a charging control means for controlling the charging means according to the detection output of the battery voltage detection means; a storage means for converting into an output; a charging completion notification means controlled by the detection output of the storage means; a connection between the storage battery and a load connected to the storage battery is detected, and the storage means is reset to a state by the detected output. The charging device is characterized in that it has a load detection means that prevents the charging completion notification means from outputting the detection output.

The present invention will be explained below with reference to examples. FIG. 1 shows an example circuit of an electric shaver incorporating the charging device of the present invention.

When the load consisting of the motor 20 is turned off by the switch 19 and a plug (not shown) is connected to the commercial AC power supply 1, the current is passed through the current limiting resistor 2, rectified by the diode bridge 3, and is used to prevent noise from the choke coil 4 and capacitor 5. It passes through a filter circuit and is sent to the charging circuit 6. The charging circuit 6 is a charging circuit consisting of a transistor inverter circuit,
resistors 7 and 8, a speed up capacitor 9, a spike voltage absorption capacitor 10, an output transistor 11, a transformer 12 consisting of a base winding, a collector winding and an output winding, an output rectifier diode 13,
It is composed of a storage battery 14 and a light emitting diode 15. Since the transistor inverter oscillates at a high frequency, the light emitting diode 15 appears to light up continuously, indicating that charging is in progress. The charging control circuit 16 has a battery voltage detection circuit that detects the terminal voltage of the storage battery 14 and a memory circuit that is set by the output of the battery voltage detection circuit, and controls the transistor 21 based on the output OS of the battery voltage detection circuit to control the charging. Controls circuit 6. When the terminal voltage of the storage battery rises to the set level set by the resistor 24, the battery voltage detection circuit detects this and
The transistor 21 is turned on. The transistor inverter is therefore stopped and charging is stopped. Therefore, the light emitting diode 15 also turns off, indicating that charging is complete. When the voltage of the storage battery 14 decreases in this charging stopped state, the battery voltage detection circuit detects that the voltage has fallen below the set level and turns off the transistor 21. Therefore, the transistor inverter operates and starts charging. Therefore, the light emitting diode 15
is also lit. By repeating this process, high current charging changes to small current charging, and completion of charging is indicated by blinking of the light emitting diode.

When the battery voltage detection circuit detects that the terminal voltage of the storage battery 14 has reached the set level, it sets a memory circuit and sends the output MC of this memory circuit to the melody IC 17. The melody IC 17 is supplied with a power supply VDD ₂ from a rectifier diode 22 and a capacitor 23 that rectify the output of the output winding. This output is also supplied as an input CH to the charging control circuit 16. This input CH is used to determine whether the commercial AC power supply 1 is connected. Melody IC
When power supply VDD ₂ is supplied, speaker 17 enters standby state, and depending on the state of input MT, speaker 1
8 to perform the performance. Therefore, the melody IC 17 is turned on by the output MC, and the flashing of the light emitting diode 15 and the completion of charging are simultaneously indicated by the sound and light of the melody, thereby increasing the display effect.

In this charging completion display state, when the switch 19 of this electric shaver is turned on and the motor 20 is rotated with the AC power supply 1 connected, the motor 20 is generally under a heavy load, so the storage battery Since the voltage at the terminal 14 falls below the set level, the charging circuit 6 enters a continuous charging state. However, since the memory circuit set by the output of the battery voltage detection circuit is in a fully charged state, the melody IC1
7 remains in the ON state and is not recommended for charging, but is not recommended. For this reason load 2
The memory circuit is reset by the input _S1 which detects the connection with 0, and the melody IC 17 is placed in a standby state.

FIG. 2 shows an embodiment of the charging control circuit 16 of FIG. 1, and FIG. 3 is a timing chart of FIG. 2.

The battery voltage detection circuit 25 utilizes the threshold voltage of a field effect transistor (hereinafter abbreviated as FET) 26, and samples it using the signal A to reduce power consumption. The setting level is set by the resistor BR. N. so that the temperature characteristics of the set level are the same as the temperature characteristics of the storage battery 14.
MOS/FET26 is used. Memory circuit 27
holds the output of the battery voltage detection circuit 25 until the next sampling. The memory circuit 28 holds the output of the battery voltage detection circuit 25 through the memory circuit 27. The memory circuit 28 is set by the first output of the battery voltage detection circuit 25. The output Q ₁ of the memory circuit 27 controls the transistor 21 as an output OS. In addition, the output _Q2 of the memory circuit 28 is supplied as an output MC to the input MT of the melody IC 17, and
The melody is played while MT is “H”. The memory circuit 28 is connected to the OR gate 2 by the input CH and the input _S1 .
9, a reset signal is supplied to the reset terminal _R2 , and is reset when the load 20 and the AC power supply 1 are not connected. The memory circuit 28 has a function of converting the pulse-like detection output of the battery voltage detection circuit 25 into a continuous detection output, and is reset when the load 20 is connected, and has the function of converting the pulse-like detection output of the battery voltage detection circuit 25 into a continuous detection output, and is reset when the load 20 is connected. Objects that require detection output can be operated.

Since the present invention is configured as described above, it is possible to indicate the completion of charging using a melody or voice.Even if the device is out of the user's field of vision, it can be recognized, and the voice indicates that charging is complete. Did"
By saying something like this, the user can get the correct information more accurately than with conventional methods.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment of the present invention. FIG. 2 is a specific circuit diagram of the charging control circuit shown in FIG. 1, and FIG. 3 is a timing chart for each of the charging control circuits shown in FIG. 6...Charging circuit (transistor inverter),
14...Storage battery, 16...Charging control circuit, 17...
... Melody IC, 18 ... Speaker, 25 ... Battery voltage detection circuit, 27 ... Memory circuit (charging control circuit), 28 ... Memory circuit.

Claims (1)

[Scope of Claim for Utility Model Registration] A storage battery, a charging means for charging the storage battery with an output rectified current of a transistor inverter, a battery voltage detection means for detecting the voltage of the storage battery, and a terminal voltage of the storage battery that reaches a set level. charging control means for controlling the charging means according to the detection output of the battery voltage detection means when the battery voltage detection means has reached a set state, and changing the output of the battery voltage detection means from pulsed to continuous; a storage means for converting the detection output into a detection output; a charging completion notification means controlled by the detection output of the storage means; and a storage means for detecting a connection between the storage battery and a load connected to the storage battery and converting the storage means to the detection output. A charging device comprising load detection means for setting the charging completion notification means in a reset state so as not to output the detection output.