JP4431068B2 - Radio with charging function - Google Patents

Description

  The present invention relates to an improvement in prevention of wraparound at the time of transmission operation during charging of a secondary battery charging function as an additional function to a radio device using a secondary battery as a main power source.

Secondary batteries are widely used as power sources for portable radios such as amateur radios and business radios. According to Patent Document 1, in addition to those using a dedicated charger as a secondary battery charging method, an external AC adapter is used as a wireless device without using a dedicated charger from the viewpoint of versatility and cost. A wireless device with a charging function that can be charged by being connected is disclosed.
Wireless devices with a charging function using a secondary battery are increasingly important in terms of miniaturization and portability, and are necessary for mobile communications. Moreover, it has a role as an information terminal in the information-oriented society in recent years, and its use is ever increasing.
Japanese Patent Laid-Open No. 2003-189481.

  However, in the conventional wireless device with a charging function, when the secondary battery is in a transmission state during charging, the noise of the commercial power source flows into the modulation circuit of the transmission unit through the charging circuit, and the carrier wave is FM-modulated by the noise. As a result, the carrier wave is amplified and the signal transmitted from the antenna flows into the modulation circuit again to form a noise amplification loop. Further, the signal transmitted from the antenna flows into the modulation circuit again through the wiring on the printed circuit board, and a noise amplification loop is formed. For this reason, by repeating the amplification of the noise component, the noise component is emphasized from the original voice signal, and when the signal of this radio is received by another radio, the sender's voice is masked by the noise and the voice cannot be heard at all, There was a problem that only the noise sound could be heard from the speaker (commonly called wraparound).

  An object of the present invention is to solve the above-mentioned problems, and to provide a wireless device with a charging function that is simpler than the prior art, can be cheaply and reliably performs voice communication when charging a secondary battery.

Means to solve the problem

  In order to solve the above problem, the wireless device with a charging function according to the present invention determines whether the output from the sound modulation means includes commercial power supply noise when the transmission operation is reached when the secondary battery is charged. Monitoring is performed using reception demodulation means and a filter. When commercial power supply noise is included, the FET becomes non-conductive, the connection between the charging circuit unit and the radio unit is disconnected, and charging is temporarily stopped. When the commercial power supply noise disappears, the FET becomes conductive and the charging circuit unit and the radio unit are reconnected to charge the secondary battery. When transitioning to the reception operation state, charging is resumed by always turning on the FET and connecting the charging circuit unit and the radio unit.

  Further, when the transmission operation is reached when the secondary battery is charged, it is monitored using the reception demodulation unit and the filter of the reception operation unit whether the output from the audio modulation unit includes commercial power supply noise. When commercial power supply noise is included, the transistor becomes non-conductive, the connection between the charging circuit unit and the radio unit is disconnected, and charging is temporarily stopped. When the commercial power supply noise is eliminated, the transistor is turned on, the charging circuit unit and the radio unit are reconnected, and the secondary battery is charged. When shifting to the reception operation state, the charging is restarted by always turning on the transistor and connecting the charging circuit unit and the radio unit.

  When the transmission operation is reached when the secondary battery is charged, it is monitored with a filter whether commercial power supply noise is included in the current flowing into the secondary battery. When commercial power supply noise is included, the FET becomes non-conductive, the connection between the charging circuit unit and the radio unit is disconnected, and charging is temporarily stopped. When the commercial power supply noise disappears, the FET becomes conductive, and the charging circuit unit and the radio unit are reconnected to charge the secondary battery. When transitioning to the reception operation state, charging is resumed by always turning on the FET and connecting the charging circuit unit and the radio unit.

  When the transmission operation is reached when the secondary battery is charged, a filter is used to monitor whether the current flowing into the secondary battery includes commercial power supply noise. When commercial power supply noise is included, the transistor becomes non-conductive, the connection between the charging circuit unit and the radio unit is disconnected, and charging is temporarily stopped. When the commercial power supply noise is eliminated, the transistor is turned on, the charging circuit unit and the radio unit are reconnected, and the secondary battery is charged. When shifting to the reception operation state, the charging is restarted by always turning on the transistor and connecting the charging circuit unit and the radio unit.

  When the transmission operation is reached when the secondary battery is charged, when the power supply voltage of the reception operation unit is turned off, the transistor is turned off to disconnect the charging circuit unit and the radio unit and temporarily stop charging. In the case of shifting to the reception operation state, when the power supply voltage of the reception operation unit is turned on, charging is resumed by turning on the transistor and connecting the charging circuit unit and the radio unit.

  Also, if the transmission operation is reached when the secondary battery is charged, when the power supply voltage of the reception operation unit is turned off, the FET is made non-conductive and the charging circuit unit and the radio unit are disconnected to temporarily stop charging. To do. When transitioning to the reception operation state, when the power supply voltage of the reception operation unit is turned on, the FET is turned on to connect the charging circuit unit and the radio unit to resume charging.

The invention's effect

According to the present invention, when the transmission operation is reached during charging, the charging is temporarily stopped, so that the noise of the commercial power source flows into the modulation circuit of the transmission unit through the charging circuit, and the carrier wave is FM-modulated by the noise. Thus, it is possible to prevent the signal amplified from the antenna and transmitted from the antenna from flowing into the modulation circuit again to form a noise amplification loop. Further, it is possible to prevent the signal transmitted from the antenna from flowing into the modulation circuit again through the wiring on the printed circuit board and forming a noise amplification loop. Therefore, by repeating the amplification of the noise component, the sender's voice can be heard without enhancing the noise component from the original voice signal.
This eliminates the need for the addition of a shield plate for noise removal, which was previously required for countermeasures against wraparound, and does not require consideration during design, providing a radio at a low cost and reducing development costs by reducing the radio design effort. Reduction.

  Hereinafter, embodiments according to the present invention will be described with reference to the drawings. In addition, the same code | symbol is provided about the same component.

<First embodiment>
FIG. 1 is a block diagram showing a configuration of a wireless device with a charging function according to the first embodiment of the present invention. This block is largely divided into a radio unit and a charging circuit unit. The radio unit will be described.
In FIG. 1, an antenna 1 is a device that transmits and receives radio waves. The transmission / reception change-over switches 2-1 to 2-3 are switches for switching the operation between the transmission operation state and the reception operation state. The transmission / reception change-over switches 2-1 to 2-3 are interlocked. If the common terminal c of the transmission / reception change-over switch 2-1 is connected to the contact a, the transmission / reception change-over switch 2-2 and the transmission / reception change-over switch 2-3 are also common. Terminal c is connected to contact a. If the common terminal c of the transmission / reception changeover switch 2-1 is connected to the contact b, the transmission / reception changeover switch 2-2 and the transmission / reception changeover switch 2-3 are also connected to the contact b.
The common terminal c of the transmission / reception selector switch 2-1 is connected to the antenna 1, the contact a is connected to the reception demodulation means 3, and the contact b is connected to the transmission means 8. The common terminal c of the transmission / reception selector switch 2-2 is connected to the power switch 9 and the reception demodulation means 3, the contact a is connected to the noise amplifier 12 and the audio signal amplification means 4, and the contact b is connected to the audio modulation means 7 and the transmission means 8. Has been. The common terminal c of the transmission / reception selector switch 2-3 is connected to the reception demodulating means 3, the contact a is connected to the audio signal amplifying means 4, and the contact b is connected to the noise filter 11.

  In FIG. 1, the reception demodulating means 3 is intended to extract an audio signal from the received modulated signal. The audio signal amplification means 4 amplifies the audio signal to a required level. The speaker 5 outputs an audio signal as audio. The microphone 6 is a device that converts sound into an audio signal. The sound modulation means 7 is intended to modulate a high frequency signal with a sound signal. The transmission means 8 is intended to amplify the modulated high frequency signal to a required level. The power switch 9 opens and closes the power supply of the radio. The secondary battery 10 serves as a power supply source for the wireless device. The resistor 17 is a resistor that determines the charging current of the secondary battery during charging. The charging circuit connection jack 18 is provided to connect the charging circuit unit.

  The noise filter 11 is used for the purpose of detecting noise that causes sneaking into the radio wave transmitted when the transmission operation is reached while the secondary battery is being charged. The noise amplifier 12 is for amplifying the detected noise to a certain level. The semiconductor switch 13 becomes non-conductive if there is detected noise, and becomes conductive if no noise is detected.

  The charging circuit unit in FIG. 1 will be described. The charging circuit connection plug 19 is used by connecting to the charging circuit connection jack 18 when charging the secondary battery of the wireless device. The charging means 20 is a part that converts the commercial power source into a constant DC voltage. The power plug 21 is used for power supply by connecting to a commercial power source.

  FIG. 2 is a block diagram showing a detailed configuration of the semiconductor switch 13. The transistor 14-1 becomes conductive when the output from the noise amplifier is detected, and becomes nonconductive when the output from the noise amplifier is not detected. The FET 15 functions as a switch for turning on and off the current flowing from the resistor 17 to the secondary battery 10. The FET 15 is in a non-conductive state when the transistor 14-1 is in a conductive state, and is normally in a conductive state. The bias resistor 16 is a bias resistor of the FET 15.

The semiconductor switch 13 is in a non-conducting state when the transistor 14-1 in FIG. 2 is in a conducting state and the FET 15 is in a non-conducting state. In this state, the resistor 17 and the secondary battery 10 in FIG. 1 are disconnected.
The semiconductor switch 13 is in a conductive state when the transistor 14-1 in FIG. 2 is in a non-conductive state and the FET 15 is in a conductive state. In this state, the resistor 17 of FIG. 1 and the secondary battery 10 are connected.

The operation of the wireless device with a charging function configured as described above will be described below.
First, when the common terminal c of the transmission / reception changeover switch 2 is connected to the contact b, the input current of the secondary battery 10 is supplied to the transmission means 8 and the sound modulation means 7, and further, the transmission means 8 and the antenna 1 are connected. Connected. Since the current is supplied, the sound modulation means 7 and the transmission means 8 operate. This state is the transmission state.
In this state, when sound is added to the microphone 6, the sound modulation means 7 modulates the high-frequency signal (common name: carrier wave) with the sound signal, and the high-frequency signal modulated by the transmission means 8 is amplified. A high-frequency signal modulated through the transmission / reception selector switch 2-1 is sent to the antenna 1. A high frequency signal modulated by the antenna 1 is transmitted as a radio wave.

When the common terminal c of the transmission / reception changeover switch 2 is connected to the contact a, the input current of the secondary battery 10 is supplied to the audio signal amplification means 4 and the reception demodulation means 3, and further, the reception demodulation means 3 and the antenna 1 Is connected. Since the current is supplied, the reception demodulating means 3 and the audio signal amplifying means 4 operate. This state is the reception state.
In this state, the modulated signal received from the antenna 1 is sent to the reception demodulation means 3 through the transmission / reception selector switch 2-1. An audio signal is extracted from the modulated signal by the reception demodulating means 3. The extracted audio signal is amplified to a required level by the audio signal amplifying means 4, and then the audio signal is converted into audio from the speaker 5 and output.

  When charging the secondary battery 10, the charging circuit connection plug 19 is connected to the charging circuit connection jack 18, and the power plug 21 is connected to a commercial power source. The commercial power source is changed to a constant voltage by the charging means 20, and a constant current is supplied to the secondary battery 10 through the resistor 17 and charged. In the case of non-charging the secondary battery, the charging circuit connecting plug 19 and the charging circuit connecting jack 18 are disconnected, whereby the charging circuit unit and the secondary battery 10 are completely disconnected and charging is not performed.

  In the transmission operation while the secondary battery 10 is being charged, an audio signal is extracted from the modulated high-frequency signal applied to the transmission unit 8 by the reception demodulation unit 3, and a noise component is extracted from the commercial power source by the noise filter 11. . The noise component extracted by the noise amplifier 12 is amplified to a certain level. When the amplified noise component exceeds the reference value, the semiconductor switch 13 is turned off, that is, the transistor 14-1 in FIG. 2 is turned on and the FET 15 is turned off. When the amplified noise component falls below the reference value, the semiconductor switch 13 is turned on, that is, the transistor 14-1 in FIG. 2 is turned off and the FET 15 is turned on. When the semiconductor switch 13 is turned off, the secondary battery 10 is disconnected from the resistor 17 and is not charged. Further, when the semiconductor switch 13 becomes conductive, the secondary battery 10 is connected to the resistor 17 and charged.

  In the above embodiment, the audio modulation means 7 and the reception demodulation means 3 are directly connected by the path ef. However, the present invention is not limited to this, and the high-frequency signal transmitted from the antenna 1 is on the printed circuit board. Since the signal is received through the wiring, the sound modulation means 7 and the reception demodulation means 3 may not be directly connected by the path ef.

  In the above embodiment, the signal is connected to the noise monitoring means through the reception demodulating means 3, but the present invention is not limited to this, and may be connected to the noise monitoring means through the resistor 17 as shown in FIG.

  In the transmission operation during charging of the secondary battery 10, the commercial power supply noise component flowing into the secondary battery 10 is extracted by the noise filter 11. The noise component extracted by the noise amplifier 12 is amplified to a certain level. When the amplified noise component exceeds the reference value, the semiconductor switch 13 is turned off and the secondary battery 10 is disconnected from the resistor 17 and is not charged. When the amplified noise component falls below the reference value, the semiconductor switch 13 is turned on, and the secondary battery 10 is connected to the resistor 17 and charged.

  In the above embodiment, the FET 15 is used for the configuration of the semiconductor switch 13. However, the present invention is not limited to this, and the commercial power supply noise component extracted by the noise filter 11 is amplified by the noise amplifier 12 and the commercial power supply noise is obtained. A transistor may be used because it is only necessary to perform non-conduction or conduction depending on the component above or below the reference value.

<Second Embodiment>
FIG. 4 is a block diagram showing a configuration of a wireless device with a charging function according to the second embodiment of the present invention. The wireless device with a charging function according to the second embodiment is different from the first embodiment in the following points.
(1) Do not use the reception demodulating means 3, the noise filter 12, and the noise amplifier 13 for monitoring commercial power supply noise in the transmission operation state where the secondary battery 10 is being charged.
(2) The transistor 14-2 for connecting or disconnecting the secondary battery and the charging circuit unit is provided in the receiving state or transmitting state while the secondary battery 10 is being charged.

  In the receiving operation while the secondary battery 10 is being charged, since the common terminal c of the transmission / reception selector switch 2 is connected to the contact a, a voltage is supplied to the base of the transistor 14-2 and the transistor 14-2 becomes conductive. . The resistor 17 and the secondary battery 11 are connected and the secondary battery 11 is charged.

  In the transmission operation while the secondary battery 10 is being charged, since the common terminal c of the transmission / reception selector switch 2 is connected to the contact b, no voltage is supplied to the base of the transistor 14-2, and the transistor 14-2 is in a non-conductive state. It becomes. For this reason, the resistor 17 and the secondary battery 11 are disconnected, and charging of the secondary battery 11 is interrupted.

  In the above embodiment, the transistor 14-2 is used. However, the present invention is not limited to this, and it is only necessary to perform non-conduction or conduction in the transmission operation or the reception operation while the secondary battery 10 is being charged. May be used.

  1 is a first block diagram illustrating a configuration of a wireless device with a charging function according to a first embodiment of the present invention.   FIG. 2 is a block diagram showing a detailed configuration of a semiconductor switch 13 in FIG. 1.   It is a 2nd block diagram which shows the structure of the radio | wireless machine with a charging function which concerns on the 1st Embodiment of this invention.   It is a block diagram which shows the structure of the radio apparatus with a charging function which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Antenna 2-1 thru | or 2-3 ... Transmission / reception change-over switch 3 ... Reception demodulation means 4 ... Audio | voice signal amplification means 5 ... Speaker 6 ... Microphone 7 ... Audio modulation means 8 ... Transmission means 9 ... Power switch 10 ... Secondary battery 11 ... Noise filter 12 ... Noise amplifier 13 ... Semiconductor switch 14-1 to 14-2 ... Transistor 15 ... FET
DESCRIPTION OF SYMBOLS 16 ... Bias resistance 17 ... Resistance 18 ... Charging circuit connection jack 19 ... Charging circuit connection plug 20 ... Charging means 21 ... Power plug

Claims (2)

When the transmission operation has been reached, the output from the sound modulation means is monitored by using the reception demodulating means and the filter of the reception operation unit to check whether the output from the commercial power supply noise is included. connection between the charging circuit unit semiconductor switch becomes non-conductive and the radio unit is disconnected temporarily stops charging, the charging circuit part and radio part becomes the semiconductor switch is in a conducting state when the commercial power supply noise is eliminated is reconnected secondary battery is charged, when a transition to the reception operation state is always wireless-equipped charging function, characterized in that to resume charging by connecting the charging circuit unit and a semiconductor switch into a conducting state and a radio unit. When the transmission operation is reached, a filter is used to monitor whether the current flowing into the secondary battery includes commercial power supply noise. If the commercial power supply noise is included, the semiconductor switch becomes non-conductive and the charging circuit unit and once stopped connections are disconnected charged with radio unit, the charging circuit unit becomes the semiconductor switch is in a conducting state and the radio unit when the commercial power supply noise is eliminated is the secondary battery is reconnected is charged, the receiving operation state migrated if always radios with charging function, characterized in that to resume charging by connecting the charging circuit unit and a semiconductor switch into a conducting state and a radio unit.

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