JPS5838055B2 - Charging device with charging completion display function - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a charging device with a charging completion display function, and its purpose is to provide a charging completion display that can notify the completion of charging with sound and can be manufactured at low cost with a simple circuit. To provide a charging device with functions.

Conventionally, in order to display the completion of charging in a charging device, the voltage of the storage battery is generally compared with a predetermined reference voltage, and when the voltage exceeds the reference voltage, the display means is operated.

Therefore, when using a sounding element as a display means, a voltage comparison means for comparing the voltage of the storage battery with a predetermined reference voltage and an audible sound signal oscillation means for driving the sounding element to oscillate are essential. The problem was that it became complicated.

The present invention solves these drawbacks of the conventional example, and focuses on the fact that the inverter oscillation unit used to charge the storage battery enters an intermittent oscillation state when charging is completed, and separately provides an audible sound signal oscillation means. This eliminates the need to provide a separate circuit, simplifying the circuit configuration.

The configuration of the present invention will be described below with reference to illustrated embodiments. As shown in FIGS. 1 to 4, there is a rectifier smoothing circuit 2 connected to a commercial AC power supply 1, and an inverter oscillation unit 3 that oscillates alternating current;
A rectifier circuit 5 rectifies the oscillation output of the inverter oscillator 3 to charge the storage battery 4, and compares the voltage of the storage battery 4 with the end-of-charge voltage, and when the battery voltage is lower than the end-of-charge voltage, the inverter oscillator 3 is continuously activated. It has an oscillation control section 6 that sets the inverter oscillation section 3 to an intermittent oscillation state when the battery voltage reaches a voltage near the end-of-charge voltage. The sound generating element 8 is made to vibrate by a signal passed from a low-pass filter 7 that passes a frequency component lower than the frequency during continuous oscillation.

However, when the storage battery 4 is charged with a charging current obtained by rectifying a continuous high-frequency alternating current as shown in part A of Fig. 2, the output of the low-pass filter 7 is as shown in Fig. 3 a. This is the envelope of the direct current.

Therefore, while the storage battery 4 is being charged, the sounding element 8 is only biased in one direction, and the sounding element 8 does not ring.

Next, when the storage battery 4 is charged and the battery voltage reaches the end-of-charge voltage, the oscillation control section 6 puts the inverter oscillation section 3 into an intermittent oscillation state.

At that time, the charging current will be as shown in part B of Fig. 2.

Therefore, the output of the low-pass filter I takes the envelope of the thinned-out charging current, as shown in FIG. 3b.

Therefore, the sound generating element 8 starts to ring, and by setting the frequency to be an audible frequency, the user can audibly recognize the completion of charging.

FIG. 4 shows a specific circuit of another embodiment of the present invention. In this embodiment, the inverter oscillation section 3 is constituted by a locking oscillation circuit driven by the commercial power supply 1, and also serves as an oscillation transformer. Secondary output winding L of output transformer T.

The high-frequency alternating current output is rectified by a diode D, and the storage battery 4 is charged as a charging current.

The transistor Tr1 divides the reference voltage created by the Zener diode Z with a resistor R through the resistors R2 and R3, compares this divided voltage with the voltage of the storage battery 4, and determines when the storage battery 4 is fully charged (
This is to detect the rise in the terminal voltage at the time of completion of charging and operate the transistor Tr2 to stop the oscillation of the transistor Tr3.This oscillation stops when the voltage of the storage battery 4 decreases and the base voltage of the transistor Tr1 increases. The voltage continues until the voltage of the storage battery 4 drops and becomes lower than the base voltage of the transistor Tr1, and then oscillation is resumed and charging is performed.

In this way, oscillation and stopping of oscillation are repeated, resulting in a thinned-out high-frequency alternating current output.

The sound generation display block 9 rectifies the output of the secondary output winding Loo, which is wound around the same core as the output transformer T, using the diode D1, and uses the rectified output to light the light emitting diode D2, so that the lighting becomes intermittent. Displays charging completion.

Further, the rectified output of the diode D1 is passed through a low-pass filter 7 composed of resistors R4 and R5, capacitors C1 and C2, and an inductance element LX to drive the sound generating element 8.

In the figure, LO is a collector winding, and LB is a base winding, which constitute the windings of the output transformer T, respectively.

The present invention is configured as described above, and includes a rectifying and smoothing circuit connected to a commercial AC power source, an inverter oscillation section connected to the output of the rectifying and smoothing circuit and oscillating high-frequency AC current,
A rectifier circuit that rectifies the oscillation output of the inverter oscillator to charge the storage battery compares the voltage of the storage battery with the end-of-charge voltage, and when the battery voltage is lower than the end-of-charge voltage, sets the inverter oscillator to a continuous oscillation state. It has an oscillation control section that puts the inverter oscillation section into an intermittent oscillation state when the voltage reaches a voltage near the end-of-charge voltage, and uses the oscillation output of the inverter oscillation section as input, Since the sound generating element is made to sound by a signal passed through a low-pass filter that passes low frequency components, it is possible to visually recognize the state of charge of the storage battery, and the sound display section is Since it can be constructed from a low-pass filter and a sounding element, the circuit configuration is simple, small, lightweight, and inexpensive to manufacture, and the Rono temporary filter is L. C. It is flexible because it can be configured with two types of R parts, and the voltage level required for the sounding element can be freely set by using a transformer.If the voltage level of the sounding element matches, the transformer There is no need to add additional windings, and it is possible to install the coil windings with matching voltage levels.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of one embodiment of the present invention, FIGS. 2 and 3 are operation explanatory diagrams of the same, and FIG. 4 is a circuit diagram of another embodiment of the present invention. 1 is a commercial AC power supply , 2 is a rectifying and smoothing circuit, 3 is an inverter oscillation section, 4 is a sound generating element, 5 is a rectifying circuit, 6 is an oscillation control section, 7 is a low-pass filter, and 8 is a sound generating element.

Claims (1)

[Claims] 1. A rectifying and smoothing circuit connected to a commercial AC power source, an inverter oscillating section connected to the output of the rectifying and smoothing circuit and oscillating high-frequency alternating current, and a rectifying circuit that rectifies the oscillation output of the inverter oscillating section to charge a storage battery. , the voltage of the storage battery is compared with the end-of-charge voltage, and when the battery voltage is lower than the end-of-charge voltage, the inverter oscillation section is set to continuous oscillation, and when the battery voltage reaches a voltage near the end-of-charge voltage, the inverter oscillation section is set to intermittent oscillation. and an oscillation control section for setting the oscillation state,
Charging characterized in that the oscillation output of the inverter oscillation section is input, and the sound generating element is made to ring with a passed signal from a low-pass filter that passes a frequency component lower than the frequency during continuous oscillation of the inverter oscillation section. Charging device with completion display function.