JPH0635573A - Power circuit device - Google Patents

Abstract

PURPOSE:To transfer multiple charge data and power control data with a small number of connection members by providing parallel/serial conversion circuits for a unit main body and an AC adapter and executing serial wireless transmission between the unit main body and the AC adapter. CONSTITUTION:At the time of transmitting data from the unit main body 2 to the AC adapter 1, the parallel/serial (P/S) conversion circuit 17 converts parallel data into serial data. Data is transmitted from the data line 102 to the P/S conversion circuit 13. The P/S conversion circuit 13 converts serial data into parallel data and gives it to the power/charge control 11. A control signal from the power/charge control 11 is converted into serial data in the P/S conversion circuit 12, transmitted to the AC adapter 1 through the data line 102, converted into a parallel signal in the P/S conversion circuit 16 and is used for power/charge control. This, data can be transmitted with the small number of the transmission lines.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a portable small electronic device having a built-in battery and a power supply circuit device having an external charging circuit and AC adapter, and more particularly to controlling a power supply circuit external to the device, a main body power supply circuit and charging. The present invention relates to a circuit configuration of a power supply circuit device.

[0002]

2. Description of the Related Art Many portable devices such as so-called notebook computers have a built-in secondary battery. In order to reduce the size of the device, it is necessary to provide a quick charging circuit in the AC adapter to rapidly charge the secondary battery inside the device.

In order to perform quick charging, in addition to monitoring the voltage of the secondary battery, a signal for notifying the device of a charging abnormality and a warning L
A signal for turning on the ED (light emitting diode) is required, which results in parallel data transfer.

In the conventional quick charge control, the number of connecting members, for example, connectors and cables, is increased by the number of charge control signals in addition to the positive signal line and the negative signal line of the power source, and the AC adapter and the apparatus main body. The charge control signal is transmitted to the.

[0005]

However, in the above-mentioned conventional method, it is necessary to determine how much information should be used to control the power supply circuit and the charging circuit from the design stage of the device.
If the number of control signals increases in the middle stage, it is necessary to change the number of connecting members, resulting in a large loss in time.

Furthermore, when a plurality of types of secondary batteries or batteries are used in the same device, the control signal is increased to about 5 or 6, and the connection member for the power supply is realized in consideration of portability. It becomes an impossible number.

Further, since minute change analog data such as battery voltage change information and battery temperature information are transmitted through the connecting member, the noise level becomes high due to the impedance of the connector or cable and the influence of external noise. However, there is a problem that information cannot be transmitted correctly and charging control becomes abnormal.

An object of the present invention is to solve the above problems and provide a power supply circuit device capable of exchanging a large amount of charging data and power supply control data without increasing the number of connecting members. Furthermore, the effect of noise is eliminated,
An object of the present invention is to provide a power supply circuit device capable of sending correct data.

[0009]

In order to achieve the above object, the power supply circuit device of the present invention adopts the following configuration.

The power supply circuit device of the present invention includes at least a device main body containing a battery and an AC provided outside the device main body.
The present invention is characterized in that an adapter is provided, a parallel / serial conversion circuit is provided in each of the device body and the AC adapter, and a charging control signal and a power supply control signal are transmitted between the device body and the AC adapter.

The equipment main body of the power supply circuit device of the present invention is characterized by having an analog / digital conversion circuit.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The power supply circuit device of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a circuit diagram showing a configuration of a power supply circuit device of the present invention.

As shown in FIG. 1, both the device main body 2 and the AC adapter 1 are provided with a parallel / serial conversion circuit 1.
2, 13, 16, 17 and the clock count circuit 14,
And 15 are provided.

The respective control signals 110, 111, 126, 127 from the first clock counting circuit 14 and the second clock counting circuit 15 are transferred to the first to fourth parallel-serial conversion circuits 12, 13, 16 respectively. , 17 are connected.

The data line 102 and the clock line 1 are provided between the first and second parallel / serial conversion circuits 12 and 13 and the third and fourth parallel / serial conversion circuits 16 and 17.
03 is a connecting member, and in the present invention, the connector 200 and the cable 201 are connected.

The first and second clock count circuits 14,
The clock line 103 is also connected to 15. Clock line 1
The clock signal to 03 is provided by the oscillator 20.

Control parallel signal lines 104, 105 and 106 are connected from the power supply / charge control circuit 11 to the first parallel / serial conversion circuit 12.

Further, information parallel signal lines 107, 108 and 109 are connected from the second parallel / serial conversion circuit 13 to the power supply / charge control circuit 11.

The power supply circuit 10 is a circuit for producing a DC voltage from an AC voltage, and is a power supply line 100 for the equipment main body 2.
Output, and the first and second parallel / serial conversion circuits 12 and 13 inside the AC adapter 1, the first and second clock count circuits 14 and 15, and the power supply / charge control circuit 1
Power is supplied to 1 and 1 via a power supply line.

The ground potential of the AC adapter 1 and the ground potential of the device body 2 are connected by a ground line 101.

The power supply line 100 and the ground line 101 are connected through a connecting member, which is a connector 200 and a cable 201 in this embodiment, to the AC adapter 1 and the device body 2.
Connect between and.

The signal line 125 is directly connected to the positive terminal of the stabilized power source of the device body 2.

An analog signal 123 indicating the voltage state of the battery 24 is connected to the amplifier 21 in the device body 2. The output 128 of the amplifier 21 and the analog / digital conversion circuit 18
And connect.

Further, the analog signal 124 of the thermistor 23 for detecting the temperature state of the battery 24 is connected to the amplifier 22. The output 129 of the amplifier 22 is connected to the analog / digital conversion circuit 18.

The digital signals 120, 121, 122 output from the analog / digital conversion circuit 18 are connected to the fourth parallel / serial conversion circuit 17.

A digital signal from the device body 2, for example, a digital signal 118 indicating the load state of the device body 2 and a digital signal 119 indicating the type of battery are connected to the fourth parallel / serial conversion circuit 17. .

From the third parallel-serial conversion circuit 16, a parallel signal 113 for turning on the warning LED 25 and a parallel signal for controlling the transistor 26 for turning on / off the charging current flowing through the charging current supply line 132. The signal line 114 outputs.

Further, from the third parallel / serial conversion circuit 16, a parallel signal line for controlling the stabilizing power source of the device body 2, for example, a signal line 115 for forcibly turning off the stabilizing power source, and the device body 2 are connected. A signal line 116 forcibly cutting the fuse and a signal line 117 for efficiently controlling the stabilized power supply of the device body 2 according to the load are output.

Next, the operation of the power supply circuit device shown in FIG.
This will be described with reference to FIGS. 2 and 3. FIG. 2 is a schematic flow chart of the power supply circuit device of the present invention, and FIG. 3 is a waveform diagram showing signals from the device main body to the AC adapter in the parallel-serial conversion circuit of the present invention. Hereinafter, description will be made by alternately using FIG. 1, FIG. 2 and FIG.

When the power of the AC adapter 1 is turned on, or when the connection member is used, the AC adapter 1 and the device main body 2
When and are connected, clock counting is started (processing a in FIG. 2).

Next, the transmission from the device body 2 to the AC adapter 1 is started (process B in FIG. 2).

Further, the fourth parallel / serial conversion circuit 17 converts the parallel data into serial data (processing C in FIG. 2). At this time, the operation of the third parallel-serial conversion circuit 16 is stopped by the second clock count circuit 15.

Next, the serial data converted by the fourth parallel / serial conversion circuit 17 is given to the second parallel / serial conversion circuit 13 through the data line 102 (process D in FIG. 2).

Next, the second parallel / serial conversion circuit 13 converts the serial signal into a parallel signal (processing E in FIG. 2).

Next, the power supply / charge control circuit 11 generates a control signal for this parallel data (process F in FIG. 2). Until the stop bit is detected (processing in FIG. 2), the operation is returned to the processing B. If the stop bit is detected here, the AC adapter 1
Starts transmission from the device to the device body 2 (process H in FIG. 2).

Next, from the power supply / charge control circuit 11, the first
Since the control parallel signal is input to the parallel / serial conversion circuit 12 of, the control parallel signal is converted into a serial signal (processing of FIG. 2).

Next, this serial signal is transferred to the data line 102.
To (process number in FIG. 2).

Next, the third parallel / serial conversion circuit 16 converts the serial signal into control parallel data (processing in FIG. 2).

Thereafter, individual power supply / charge control is executed (process E in FIG. 2).

Until the stop bit is detected, the process returns to the control of the process again (process W in FIG. 2).

After detecting the stop bit, if the power supply / charge control is terminated, for example, when it is recognized that the battery is fully charged, the control is terminated, and if not, the process returns to the process B control (see FIG. 2). Processing power).

In FIG. 3, a clock (a) is a clock input to the first clock count circuit 14 and the second clock count circuit 15, and the fourth parallel-serial conversion is performed at the rising edge of the clock. Circuit 17
The parallel data, which is a signal input to, is latched, serial data (i) is created, and the serial data is transmitted.

This serial data (i) is latched at the trailing edge of the clock (a) to create parallel data (j, k, l, m, n, o, p), and the second data It is output as a parallel signal of the parallel / serial conversion circuit 13.

When the stop bit is detected, the operations of the second parallel-serial conversion circuit 13 and the fourth parallel-serial conversion circuit 17 are stopped, and the first parallel-serial conversion circuit 13 is stopped.
By operating the serial conversion circuit 12 and the third parallel / serial conversion circuit 16, data can be sent from the AC adapter to the device body in the same manner.

Data can be transmitted / received by changing the direction of reception / transmission of a serial signal with a certain count number of a clock (processes and processes in FIG. 2). This is repeated (process F in FIG. 2), and the power supply / charge control is managed so that it is always operating.

Then, under a certain condition, for example, when the battery is fully charged, or when the main switch of the device body 2 is turned on, the operation of the power supply / charge control is terminated (process F in FIG. 2).

Here, the clock signal to be used may be specially made, but in most cases of a notebook computer, a real time clock (hereinafter referred to as RTC) is built in. Therefore, if the oscillation frequency of 32.768 KHz used in the RTC is used, it is not necessary to make it specially, and since it is the power supply / charge control, it does not need to be so fast, and this level of frequency is sufficient. is there.

Further, since the RTC is normally in operation even when the main power source of the device main body is off, there is a problem in power control and charging even when the main power source of the device main body is off. Absent.

For example, as a secondary battery, both nickel cadmium battery (hereinafter referred to as Ni-Cd battery) and nickel-hydrogen battery (hereinafter referred to as Ni-MH battery) can be used as a usable device. Suppose there is. Here, the user inserts the Ni-Cd battery into the device and tries to use it.

When "H" is given to the 1 digital signal 19 of FIG. 1, the Ni-Cd battery is electrically or mechanically set to "H" (b of FIG. 3). .

As a matter of course, the digital signals 120, 121, 122 of the battery voltage or the battery temperature that have passed through the analog / digital conversion circuit 18 are also connected to the transmission section of the fourth parallel / serial conversion circuit 17. That is, parallel data (c, d, e, which indicates the battery voltage and the battery temperature)
f, g, h) are input.

When the AC adapter 1 is turned on, or when the AC adapter 1 and the device body 2 are connected by the connecting member, clock counting is started (process B in FIG. 2).

The first clock count circuit 14 and the second clock count circuit 14
Since the same clock signal is used for synchronization with the clock count circuit 15 of FIG. 3 (a in FIG. 3), it is necessary to determine what kind of meaning is given to which count and the second parallel-serial conversion circuit. Which data line is output to which signal line of 12 parallel outputs (j, k, l, m,
n, o, p,).

Therefore, the power supply / charge control circuit 11 can understand the parallel signal, and know that the Ni-Cd battery is connected to the charging circuit, the battery voltage, and the battery temperature. You can

The power supply / charging control circuit 11 sends a parallel control signal to the transmitter of the first parallel / serial conversion circuit 12.

After that, a signal can be sent to the device body 2 by the same means as described above. For example, when it is detected that the battery voltage indicates full charge, the charging circuit outputs “H” to the parallel signal 113 to the parallel output of the receiving unit of the third parallel-serial conversion circuit 16 on the device body 2 side. It is possible to send the data for stopping the charging current by causing the warning LED 25 to light up so that the voltage is generated and by causing the parallel signal 114 to have the voltage “H”.

Further, as an example of power supply control, a signal indicating the load state of the stabilized power supply on the device body 2 side is input to the third parallel / serial conversion circuit 16 on the device body 2 side,
By transmitting data to the AC adapter 1 side as described above, the power supply on the AC adapter 1 side can be efficiently operated depending on the load state of the device body 2.

AC adapter 1 side or device body 2
A one-chip CPU or a ROM and a CPU may be provided on the side to perform control, and various controls can be performed by rewriting a program there.

Furthermore, if the parallel / serial conversion circuit and the clock count circuit are integrated into a semiconductor integrated circuit as an ASIC of a gate array or a standard cell, the size can be reduced and the power supply device can be used.

Further, if the clock count number is programmable, the number of control signals can theoretically be increased. And the number of connecting members is improved to four.

Further, since an analog signal can be converted into a digital signal within the main body of the device and transmitted, the influence of noise due to the impedance of the cable or the connector caused by connecting the connecting member can be ignored, and accurate data can be supplied to the power source. It can be sent to the charge control circuit 11.

[0062]

As is apparent from the above description, in the power supply circuit device according to the present invention, the number of connecting members does not increase in proportion to the control signal even if the type of control signal increases, and the control signal does not increase. Can be realized with four connecting members.
As a result, cost increase is suppressed, and design changes during development can be easily performed, enabling fine control.

Furthermore, since the power supply circuit device of the present invention can convert an analog signal into a digital signal and transmit it,
This has the effect of suppressing the influence of noise to a low level.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a power supply circuit device of the present invention.

FIG. 2 is a flowchart for explaining the operation of the power supply circuit device of the present invention.

FIG. 3 is a waveform diagram for explaining the operation of the parallel / serial conversion circuit in the power supply circuit device of the present invention.

[Explanation of symbols]

 1 AC Adapter 2 Device Main Body 10 Power Supply Circuit 11 Power Supply / Charge Control Circuit 12 Parallel / Serial Conversion Circuit 13 Parallel / Serial Conversion Circuit 14 Clock Count Circuit 15 Clock Count Circuit 16 Parallel / Serial Conversion Circuit 17 Parallel / Serial Conversion Circuit 18 Analog Digital conversion circuit

Claims (2)

[Claims] 1. A device main body containing at least a battery, and an AC adapter provided outside the device main body,
A power supply circuit device characterized in that a parallel / serial conversion circuit is provided in each of the device body and the AC adapter, and a charging control signal and a power supply control signal are transmitted between the device body and the AC adapter. 2. The power supply circuit device according to claim 1, wherein the device body has an analog / digital conversion circuit.