JPH02242179A - Electric equipment - Google Patents

Abstract

PURPOSE:To make it possible to indicate sound whose quality is excellent by the constitution wherein the basic action of a load is forcibly limited or stopped when the sound is indicated under the load driving state. CONSTITUTION:A signal which is applied to a switching circuit 37 from an MPU 30 is applied to a motor control circuit 11 at the same time. The base potential of a transistor 40 which is provided as a motor voltage control element in the motor control circuit 11 is changed with said signal. Thus the voltage which is applied to a motor 8 is decreased. The motor 8 is stopped. The rotating speed is sufficiently decreased to a value lower than the preset value at the normal driving time. The noise which is generated by the sliding of an outer blade 3 and an inner blade 4 is decreased as much as possible. The terminal voltage of a charging battery 7 is stabilized. The contents which are indicated by voice from an indicating part 13 are clearly announced.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to electrical equipment such as electric shavers and radios that make noise when in use or have relatively large fluctuations in power supply voltage, and in particular the operating state of the equipment. It relates to something that performs detection.

[Prior Art] Conventionally, this type of electrical equipment has generally used an LED or a liquid crystal to visually display a display corresponding to the detected content, such as the remaining battery capacity.

However, the visual display method requires constant attention to the displayed area and is therefore less convenient to use.

To solve this problem, it has been proposed to change the volume or sound quality of a buzzer in multiple stages, or to make it possible to distinguish and notify various states of electrical equipment by using multiple mu words created by voice synthesis.

[Problem H to be solved by the invention] However, when there is a large fluctuation in load current such as a motor load, fluctuations in battery voltage cannot be avoided, and if such a voltage is used to sound a buzzer, the volume or sound quality will be affected. It is difficult to distinguish and display changes, and when displaying by voice synthesis, the display quality is poor, as the generated voice sounds wavy.

On the other hand, electric ASs that emit noise like a hair dryer or sound like a radio have many problems, such as the sound notification itself being difficult to hear.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an electrical device that can display pronunciation with excellent display quality.

[Means for Solving the Problems J The electrical equipment according to the present invention, as shown in the basic configuration in Figure @1, includes a load control means that can control the operation of the load, a drive state of the load, The apparatus includes a load driving state detecting means for generating a predetermined signal, and a sounding means for producing a display corresponding to the detection signal outputted from the detecting means.

Furthermore, during the sound generation operation by the sound generation means, the load control means limits or stops basic operations such as motor rotation and sound 'II generation at the load t.

When a motor is used as the load described above, a motor control circuit that controls the voltage applied to the motor to maintain the motor rotational speed at a set value can be used as the load control means, and during the sound generation Mffn, The motor control circuit limits the motor rotation speed to a value sufficiently lower than the set value.

In addition, when the load is a sound ## device, the volume control circuit of the audio device can be used as the load control means, and the volume control circuit limits the volume of the sound W device to a sufficiently low value during the period of sound generation by the sound generation device. It can be configured as follows.

[Function] With the above configuration, when the main switch 41 is turned on, power is supplied from the power source 42 to the load 43, and the load 43 rotates a motor if it is an electric shaver, generates a predetermined sound if it is an audio device, etc. Start basic operations.

Here, when the load drive state detection means detects an abnormality such as a drop in the voltage for driving the load, a signal is sent to the sound generation means, and the sound generation means starts displaying sound. At the same time, a signal is also sent to the load control means, and the load 43
By limiting or stopping basic movements in
The purpose is to display the pronunciation in a stable state on the pronunciation means.

[Example] The present invention will be described below using an example in which the present invention is implemented in an electric shaver shown in FIGS. 2 to 4, but the present invention is not limited to this, and can also be applied to audio equipment such as a stereo device or tape recorder, or a hair dryer or a river breeze blower. Of course, the present invention can be implemented in substantially the same way with various electrical devices, such as devices that tend to generate noise or devices that use batteries as a power source.

As shown in the external appearance in FIG. 2, the electric razor 1 embodying the present invention has an outer cutter 3 and a
The main switch 5 is provided on the front side of the main body case 2, and the power plug 6 for charging is provided at the lower part of the main body case 2. An electric circuit shown in FIG. 3 is housed inside 2.

The electric circuit uses a rechargeable battery 7 such as a nickel-cadmium battery as a power source, and by supplying power from the rechargeable battery 7 to the motor 8 via the main switch 5, the inner blade 4 connected to the motor 8 is reciprocated and electricity is generated. It is designed to perform the basic operations as R1.

In addition to the above-mentioned basic configuration, the electric power plant implementing the present invention includes a charging unit that enables charging of the rechargeable battery 7 and driving of the motor using a commercial AC power supply, and controls the voltage applied to the motor 8. a motor control circuit 11 that maintains the rotational speed of the motor 8 at a constant level; a detection unit 12 that detects the state of each part and generates a signal corresponding to the detected content; The display unit 13 includes a display unit 13 that performs display.

The charging unit 10 once rectifies the commercial AC power input from the power plug 6 using a rectifier circuit 14, and then steps down the voltage to a predetermined charging voltage using an inverter circuit 15.
A charging state detection circuit 20 provided in the detection unit 12 constantly monitors the charging state during charging, and when the detection circuit 20 detects that charging is completed, the oscillation operation of the inverter circuit 15 is limited or stopped. , prevents overcharging of the rechargeable battery 7.

The signal output from the detection circuit 20 is simultaneously sent to the display unit 13 to indicate that charging has ended.

Furthermore, the detection unit 12 is equipped with a circuit 21 that detects the discharge state of the rechargeable battery 7, and monitors the terminal voltage of the rechargeable battery 7. When the terminal voltage of the rechargeable battery 7 falls below a set value, a signal is displayed on the display unit 13. to indicate that charging is required.

On the other hand, the rotational speed of the motor 8 is monitored by the motor rotational state detection circuit 22, and when the detection circuit 22 detects that the rotational speed has significantly deviated from the specified value due to changes in load or drop in battery voltage, etc. A signal is sent to the motor control circuit 11 to automatically control the motor voltage to maintain a constant rotation speed, and at the same time, a signal is sent to the display section 13 to notify the control state of the motor rotation.

As shown in FIG. 4, the display section 13 is capable of displaying information corresponding to the content detected by the detection section 12 using audio, and is equipped with a microprocessor (MPU) 30 that controls the overall operation of the display section 13. a data storage section 31 that stores data corresponding to a series of sounds to be displayed; a speech synthesis circuit 32 that synthesizes an audio signal from the data taken out from the data storage section 31; It is composed of an output circuit 33 that converts into sound waves and outputs them.

The microprocessor 30 includes a central processing unit (CPU),
A standby mode that is a power-saving state that is equipped with a ROM or RAM and operates according to a program stored in the ROM, is supplied with power from the rechargeable battery 7, and always waits only for signal input from the detection unit 12. However, when a detection signal is input from the detection unit 12, the type of the detection signal is checked, and after performing predetermined processing such as delay processing corresponding to the type, the signal is synthesized by the speech synthesis circuit 32. At the same time as specifying the type of audio data to be output
, and turns on the output circuit 33.

The data storage section 31 stores data corresponding to a series of voices such as "Please charge" that should be pronounced and displayed by the output circuit 33.
Data is appropriately extracted from the data storage section 31 based on the data sent from the data storage section 31, and the extracted data is synthesized into a predetermined audio signal and then sequentially sent to the output circuit 33.

The output port j833 includes a filter circuit 34 for removing high frequency components from the audio signal and a circuit 35 for power amplifying the audio signal.
, a speaker 36 that converts audio signals into sound waves, and a switching circuit 37 that regulates when to connect the rechargeable battery 7 to the amplifier circuit 35 and turn it on.
is always turned off by the switching circuit 37 to reduce the power consumption of the electric shaver as a whole as much as possible, and when a significant detection signal is input from the detection section 12 to the MPU 30,
A signal is sent from the MPU 30 to the switching circuit 37 so that a predetermined sound generation operation can be performed.

In addition to the above configuration, the present invention is characterized by having a configuration that reduces the rotational speed of the motor 8 when the display section 13 starts displaying sound while the motor 8 is being driven to rotate.

That is, the signal applied from the MPU 30 to the switching circuit 37 is simultaneously applied to the motor control circuit 11,
Using this signal, the voltage applied to the motor 8 is lowered by changing the base potential of the transistor 40 provided as a motor voltage control element in the motor control circuit 11. Then, the motor 8 stops or its rotational speed is sufficiently lowered than the set value during normal driving, the noise generated by the sliding of the outer cutter 3 and the inner cutter 4 is reduced as much as possible, and the rechargeable battery 7 The terminal voltage is also stable, and the content displayed on the display section 13 is clearly announced with audio.

In addition, if the electrical equipment emits sound as a basic operation, such as a radio or tape recorder, a volume control circuit is provided, and when the sound is displayed, the background control circuit lowers the volume as a basic operation. be able to.

It goes without saying that the detected content may be changed as appropriate, such as the remaining time of a timer or the remaining capacity of a battery, if it requires advance notice or warning during the operation of the device.

Furthermore, in the above practical IK example, a negative drive power supply was used as the power supply for the sound generation means, but it is also possible to use a power supply exclusively for the sound generation means in order to counteract load noise or prevent the influence of terminal voltage fluctuations. be.

[Effects of the Invention] As described above, the present invention is configured to forcibly limit or stop the basic operation of the load when the load driving state is displayed by sound, so that the battery voltage that accompanies negative driving is reduced. Fluctuations or noise generation are reduced as much as possible, making it possible to display pronunciation with excellent display quality.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the basic configuration of the present invention. Figures 2 to 4 show an example in which the present invention is implemented in an electric shaver, Figure 2 is a perspective view showing the external shape, Figure 3 is a block diagram showing the overall configuration of the electric circuit, and Figure 4 is a block diagram showing the overall configuration of the electric circuit. FIG. 2 is a block diagram showing the configuration of a display unit. 5... Main switch, 7... Rechargeable battery, 8... Motor, 10... Charging section, 11... Motor control circuit, 12... Detecting section, 13... Display Section 22...Motor rotation state detection circuit. Inventor Masaru Tonoma Kaikai Zenmura Kiyotaka High School 1) Jun

Claims (1)

[Claims] 1. Load control means that can control the operation of the load; Load drive state detection means that detects the drive state of the load and generates a predetermined signal; and a detection output from the detection means. 1. An electrical device comprising: a sounding means for displaying a display corresponding to a signal; and a load control means restricting or stopping the basic operation of the load while the sounding means is producing sound. 2. The load is a motor (8), and the load control means is a motor control circuit (11) that controls the voltage applied to the motor (8) to maintain the rotational speed of the motor at a set value. During the period, the motor (
8. The electrical device according to claim 1, wherein the rotational speed of step 8) is limited to a value sufficiently lower than a set value. 3. The load is an audio device, and the load control means is a volume control circuit of the audio device, and the volume control circuit limits the volume of the audio device to a sufficiently low value during a sound generation period by the sound generation device. electrical equipment.