JPH0429448A - Bidirectional charging cordless telephone set - Google Patents

Abstract

PURPOSE:To prevent an operator from being conscious of a direction when placing a handset on a charger by attaching a diode bridge on the handset side circuit of a cordless telephone. CONSTITUTION:When a handset side charging terminal 5 is connected a-A and b-B to a charger side charging terminal 6, X of the diode bridge 8 is set in a forward direction, therefore, a current flows from a battery to a constant voltage circuit 1. Also, when reverse connection a-B and b-A are performed, Z of the diode bridge is set in the forward direction, therefore, the current flows to the constant circuit 1. In such a way, a power source for the constant voltage circuit can be secured, and a Vcc charging voltage can be obtained, then, a charging battery 7 is charged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a cordless telephone that charges a rechargeable battery within a handset using a charger.

[Prior Art] FIG. 2 is a diagram showing a conventional cordless telephone, in which (9) is a charger and (10) is a handset.

Figure 3 is a circuit block diagram of a conventional cordless telephone charging section, in which (1) is a constant voltage circuit, (2) is a stabilizing capacitor, (3) is a diode, (4) is a charger circuit, and (5) is a stabilizing capacitor.
) is a charging terminal on the handset side, (6) is a charging terminal on the charger side, and (7) is a rechargeable battery.

A conventional cordless telephone is configured as described above. For example, when the handset (10) is set in the charger (9), the supply voltage output from the charger circuit (4) is connected to the connection terminal as shown in FIG. (5) and (6), the handset side diode (3), the constant voltage circuit (1),
The rechargeable battery (7) is charged.

[Problems to be Solved by the Invention] In the above-mentioned conventional cordless telephone, the charging terminal on the charger side (
Since the polarities of 6) and the charging terminal on the handset side (5) are fixed, the rechargeable battery (7) will not be charged unless the polarities of both sides match correctly, so always place the handset in the same direction to charge. There was a problem that it was indispensable.

Purpose of the Invention The present invention has been made to solve the above-mentioned problems, and provides an improved two-way charging cordless that allows charging the rechargeable battery in the handset without worrying about the direction in which the charger is placed. The purpose is to supply telephones.

[Means for Solving the Problems] In order to achieve the above object, a cordless telephone according to the present invention is characterized in that a handset can be placed regardless of the polarity of the electrodes on the charger side.

[Function] Therefore, according to the cordless telephone of the present invention, by adding a diode bridge to the handset side circuit, the rechargeable battery in the handset can be charged by simply placing the handset on the charger without considering the orientation of the handset. It becomes possible to do so.

[Embodiments] Hereinafter, preferred embodiments of the present invention will be described based on the drawings. FIG. 1 shows a circuit block diagram of the present invention.
The same members as those in the configuration shown in FIG. 3 described above are given the same reference numerals.
The explanation will be omitted. In FIG. 1, (8) is a diode bridge.

Next, the operation will be explained. Handset side charging terminal (
5) to the charging terminal (6) on the charger side (a-A, b-B
) Then, since A of the diode bridge (8) becomes forward, the battery flows and enters the constant voltage circuit (1). In addition, the current does not flow into GND and the terminal because the direction is reversed. Next, when the connections are reversed (a-B, b-A), one of the diode bridges (8) is in the forward direction, so current flows and enters the constant voltage circuit (1). Also, since the directions of G and A are opposite, the current does not flow into GND and terminal a. By adding the diode bridge as described above, the power supply to the constant voltage circuit is secured, Vcc (charging voltage) is obtained, and the rechargeable battery (7) is charged.

[Effects of the Invention] As described above, according to the present invention, by adding a diode bridge to the handset side circuit of a cordless telephone, there is no need to worry about the orientation when placing the handset on the charger. , which has the advantage of being able to be constantly charged.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a charging circuit according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional cordless telephone handset (9).
and an overall view of the charger (10), and FIG. 3 is a charging circuit diagram of a conventional cordless telephone. (5) is a charging terminal on the handset side, (6) is a charging terminal on the charger side, (7) is a rechargeable battery, and (8) is a diode bridge. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Agent: Patent attorney Yoshi 1) Kenji (2 others) Figure 2

Claims (1)

[Claims] Consisting of a charger and a handset, each having a charging terminal at one end, the charger having a built-in charger circuit for supplying power, and the handset having a rechargeable battery and a charger circuit connected to the rechargeable battery. In a cordless telephone that has a built-in constant voltage circuit that supplies voltage, by adding a diode bridge between the charging terminal of the handset and the constant voltage circuit, the polarity between the charging terminal on the charger side and the charging terminal on the handset side can be changed. A bidirectional charging cordless telephone characterized by being able to be charged regardless of the relationship.