JPH07273687A - Portable radio equipment - Google Patents

Abstract

PURPOSE:To set automatically a maximum rating output depending on a type of a power supply section by providing a means detecting an internal resistance of the power supply section and a means setting the maximum rating output to the equipment. CONSTITUTION:The equipment is provided with an internal resistance detection means 11 connected to a terminal (b) (grounding side terminal) via a resistor R and a diode D at a pre-stage of a voltage stabilizing means 13 and with a transmission output setting means 12 arranged in a CPU 17 and receiving a potential Vk at a post stage of the resistor R as a detection result by the internal resistance detection means 11 and setting a maximum rating output in response to the detection result. In this case, the potential Vk of the internal resistance detection means 11 is based on a power supply voltage Ve and the power supply voltage Ve is reflected on an internal resistance Re of a battery of a kind stored in the power supply section 2 and then the internal resistance re is detected. Then the maximum rating output is set based on the internal resistance re of the power supply section 2 and a transmission output setting means 12 controls a power amplifier circuit 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable wireless communication device, and more particularly to a portable wireless communication device that can use two or more types of batteries as a power source section.

[0002]

2. Description of the Related Art FIG. 2 is a front view showing the external appearance of a portable wireless communication device, and FIG. 3 is a circuit block diagram of this portable wireless communication device.

As shown in FIG. 2, the portable radio communication device is
The casing constituting the power supply unit 2 in the lower half is detachably attached to the communication unit main body 1 in the upper half in which the operation unit 18 is provided.

With such a configuration, the power supply unit 2
A primary battery (for example, a disposable dry battery) in the (housing),
Alternatively, by storing a secondary battery (for example, a reusable battery such as a Ni-Cd battery), a plurality of types of batteries can be used as the power supply unit 2.

In the portable radio communication device, as shown in FIG. 3, the power supply voltage Ve generated between the terminals a and b from the power supply unit 2 is supplied to the power supply by the voltage stabilizing means 13 in the communication device main body 1. It is transformed into a supply voltage Vc lower than the voltage Ve, so that a stable voltage can be supplied to each functional unit of the communication device body 1 described later. The resistance re shown on the side of the power supply unit 2 is an internal resistance peculiar to the battery stored in the power supply unit 2.

Further, by the voltage stabilizing means 13,
Whether the primary battery or the secondary battery is stored in the power supply unit 2, the power supply voltage V generated by the difference in electromotive force
The difference in e can be eliminated.

That is, when a primary battery is used for the power supply unit 2, for example, five dry batteries having an electromotive force of 1.5 V are connected in series to obtain a power supply voltage Ve _{1 of} 7.5 V, and a secondary battery is used. When used, for example, Ni- with an electromotive force of 1.2 V
In the specification in which six Cd batteries are connected in series to obtain a power supply voltage Ve ₂ of 7.2V, the supply voltage Vc is set to 6.2V, which is lower than any of the power supply voltages Ve ₁ and Ve ₂ . As a result, both the primary battery and the secondary battery can be used in the power supply unit 2.

With the supply voltage Vc stabilized as described above, on the communication device main body 1 side, the CPU 17 causes the PLL based on the information set by the operation unit 18.
The frequency control means 15 and the power amplification circuit 16 which are composed of a circuit and the like are controlled, and further, the local oscillator (VCO) 14 oscillates at a predetermined oscillation frequency according to the output of the frequency setting means 15, and communication is performed.

[0009]

By the way, it is known that the internal resistance of the dry battery used as the primary battery is different from that of the Ni-Cd battery used as the secondary battery. In the case of the Ni-Cd battery as described above, the internal resistance re ₂ per battery is only about 0.01Ω, but the internal resistance re ₁ per battery as the primary battery reaches about 0.3Ω ( However, for AA batteries).

FIG. 4 shows the power supply voltage Ve and the communication device main body 1 which are stored in the power supply unit 2 depending on the difference between the primary battery and the secondary battery.
It is a graph which shows an example of the relationship with the consumption current value Ic in. The straight lines L ₁ and L ₂ shown in FIG. 4 indicate the characteristics when a primary battery and a secondary battery are used in the power supply unit 2, respectively. In addition, the illustrated example is based on the power supply specifications described above. When the primary battery is used, five dry batteries having an electromotive force of 1.5 V are connected in series, and when the secondary battery is used, the electromotive force is 1.2 V.
Six V-Ni-Cd batteries are connected in series.

Therefore, the power supply voltage Ve and the current consumption value I
The straight line L showing the relationship with c₁, L ₂The equation of
Based on Mu's law, it is expressed as follows. L₁: Ve = V₁-Ic re₁× 5 = 7.5-1.5 Ic L₂: Ve = V₂-Ic re₂× 6 = 7.2-0.06I
c In the above, V₁, V₂Are primary batteries and secondary batteries, respectively
The electromotive force of the secondary battery, which is 7.5 V in the above example,
It is 7.2V.

In the portable radio communication device having the power supply specifications as described above, the current consumption Ic often reaches 1 A when the transmission output is increased to near the maximum rated output. As shown in FIG. 4, according to the straight line L ₂ at such a consumption current value, 7.14 V higher than the supply voltage Vc of 6.2 V described above can be secured, while the straight line L ₁ According to this, 6.0 below the supply voltage Vc
Only the power source voltage Ve of V is obtained, and when the primary battery is used, stable circuit operation cannot be expected in operation with high transmission output.

The present invention has been proposed in view of the above conventional circumstances, and the maximum rated output (upper limit of transmission output) is automatically set according to the type of the power supply unit (type of battery used). It is an object of the present invention to provide a portable wireless communication device configured as described above.

[0014]

In order to achieve the above object, the present invention adopts the following means in a portable wireless communication device that can use a plurality of types of batteries as a power source section.

That is, as shown in FIG. 1, the internal resistance detecting means 11 for detecting the internal resistance re of the power supply section 2 and the transmission output setting for setting the maximum rated output (upper limit of the transmission output) according to the detection result. And means 12.

[0016]

According to the above construction, if the internal resistance of the power supply section 2 detected by the internal resistance detecting means 11 is large, the maximum rated output can be set low by the transmission output setting means 12, so the power supply section 2 can be set. The operation with the consumed current according to the obtained power supply voltage is performed regardless of the user's conscious operation.

[0017]

EXAMPLES The present invention will be described below based on examples. FIG. 1 is a circuit block diagram according to an embodiment of the present invention.

This embodiment is applied to the portable radio communication device as shown in FIG. 2, and since the external appearance is common, its description is omitted to avoid duplication. Further, as shown in FIG. 1, the power source voltage Ve generated between the terminals a and b by the power source unit 2 is supplied by the voltage stabilizing means 13 in the communication device body 1 to a supply voltage Vc lower than the power source voltage Ve.
3 is similar to the conventional example shown in FIG. 3, and since the functional units that operate by obtaining the supply voltage Vc have the same operation, the same reference numerals are given to corresponding parts. , Avoid duplication of explanation.

In this embodiment, in addition to the above construction, an internal resistance detecting means 11 is constructed so as to be connected to the terminal b (ground side terminal) via a resistor R and a diode D in the preceding stage of the voltage stabilizing means 13. A transmission output setting means 12 which is arranged in the CPU 17, receives the potential Vk of the latter stage of the resistor R as a detection result of the internal resistance detection means 11, and further sets the maximum rated output in accordance with the detection result. Prepare

The potential Vk in the internal resistance detecting means 11 is a value based on the power supply voltage Ve, and the power supply voltage Ve reflects the internal resistance re of the type of the battery stored in the power supply unit 2. , The internal resistance re is detected.

Therefore, according to the above-described embodiment, the maximum rated output is set based on the internal resistance re of the power supply unit 2 and the power output circuit 16 is controlled by the transmission output setting means 12 to obtain a high output. Even if a primary battery (dry cell), which cannot be expected to have stable operation in operation, is used as the power supply unit 2, stable operation can be guaranteed even if the user's conscious operation to suppress the transmission output is not performed. It can be operated within the output range.

[0022]

As described above, according to the present invention, in a portable wireless communication device capable of using a plurality of types of batteries as a power source unit, the user is aware that the transmission output is suppressed according to the internal resistance that varies depending on the type of the battery. Stable operation is always guaranteed with the optimum maximum rated output for each type of battery, even if no effort is made.

[Brief description of drawings]

FIG. 1 is a circuit block diagram of an embodiment according to the present invention.

FIG. 2 is a front view of a portable wireless communication device to which the present invention is applied.

FIG. 3 is a circuit block diagram of a conventional example.

FIG. 4 is a graph showing a relationship between current consumption and power supply voltage according to battery type.

[Explanation of symbols]

 2 power supply section 11 internal resistance detection means 12 transmission output setting means

Claims (1)

[Claims] 1. A portable wireless communication device capable of using a plurality of types of batteries as a power source section (2), and an internal resistance detecting means (11) for detecting an internal resistance (re) of the power source section (2), A portable wireless communication device comprising: a transmission output setting means (12) for setting a maximum rated output according to a detection result.