JP2004145703A - Power circuit device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power circuit device capable of adjusting power supply voltage in accordance with variation even when the current consumption state of a load is sharply varied. <P>SOLUTION: An address generation part 23 in a voltage control part 28 constituting a power circuit 21 generates an address which is different in accordance with a mode switching signal outputted from the control part 8 and outputs the address to a memory 22, and when the memory 22 outputs data corresponding to the address, a switch control part 14 closes any one of switches 13 in a switch array 12 in accordance with the provided data to change the amplification factor of an amplifier circuit 24 in a power supply part 25. <P>COPYRIGHT: (C)2004,JPO

Description

【００２４】
以上のようにして、メモリ２２にデータを書き込んだ後、スイッチ制御部１４によるスイッチアレイ１２の選択を有効化する。すると、以降は、制御部８が出力するモード切替え信号に応じてメモリ２２に書き込まれたデータが読み出されてスイッチ制御部１４に与えられ、前記データによって指定されるスイッチ１３が閉路する。そして、電源供給部２５には各動作モードで異なるゲインが設定されるようになり、電圧Ｖｏｕｔは略一定に維持される。
【００２５】
以上のように本実施例によれば、電圧制御部２８は、制御部８が出力するモード切替え信号を参照して負荷７の動作モード、即ち電流消費状態がどのように変化するのかを判別し、モード切替え信号に基づいて、電源供給部２５が負荷７に供給する電源Ｖｏｕｔの電圧を制御するので、負荷７の電流消費状態が大きく変動する場合でも、前記電圧が所定の値となるように制御することができる。
【００２６】
そして、電圧制御部２８のアドレス発生部２３は、異なるモード切替え信号に応じてアドレスを発生させてメモリ２２に出力し、メモリ２２がそのアドレスに対応するデータ出力すると、電圧変化部２７は、与えられたデータに応じて電源Ｖｏｕｔの電圧を変化させるので、電源Ｖｏｕｔの電圧が、各動作モードにおいて適切なレベルとなるように広い範囲で調整することができる。
【００２７】
また、電圧変化部２７を、増幅回路２４と増幅率切替え部２６とで構成したので、メモリ２２より与えられるデータに応じて増幅回路２４の増幅率を複数段階に変化させて、電源Ｖｏｕｔの電圧を調整することができる。更に、増幅率切替え部２６を、直列抵抗回路１１，スイッチアレイ１２，スイッチ制御部１４で構成したので、スイッチ制御部１４は、与えられたデータに応じてスイッチアレイ１２の複数のスイッチ１３の内いずれかを択一的に閉路させて、電源供給部２５における増幅回路２４の増幅率を変化させるので、簡単な構成によって増幅率を変化させ、電圧調整を行なうことができる。
【００２８】
本発明は上記しかつ図面に記載した実施例にのみ限定されるものではなく、以下のような変形または拡張が可能である。
モード切替え信号は、必ずしも動作制御部が制御対象に直接出力する信号に限らず、別途、電源回路装置用に出力する信号であっても良い。例えば、動作制御部が制御対象に直接出力する信号がアナログ信号である場合に、アドレス発生部に出力されるモード切替え信号は、そのアナログ信号の変化に応じてステップ的に変化する信号であっても良い。
また、制御対象側にもサブ制御用のマイコンなどが配置されている場合、上述したようにモード切替え信号はデジタルデータであっても良い。
アドレス発生部とデータ記憶部とを一体に構成しても良い。
電源電圧を常に一定に維持するものに限らず、制御対象の種類により動作モードに応じて電源電圧をダイナミックに変更するように設定しても良い。
制御対象は、その他、例えばスリープ／ウェイクアップ，のように動作モードが切替わるマイクロコンピュータなどでも良い。その場合、動作制御部は、外部要因に応じてマイクロコンピュータにモード切替え信号を出力する構成要素となる。要は、各種の動作モードに応じて消費電流が比較的大きな範囲で変化する制御対象に電源を供給する電源回路装置であれば適用が可能である。
【図面の簡単な説明】
【図１】本発明の一実施例であり、電源回路の電気的構成を示す機能ブロック図
【図２】電源回路のメモリにデータを書き込んで設定する場合の手順を示すフローチャート
【図３】従来技術を示す図１相当図（その１）
【図４】図１相当図（その２）
【符号の説明】
７は負荷（制御対象）、８は制御部（動作制御部）、１２はスイッチアレイ、１４はスイッチ制御部、２１は電源回路（電源回路装置）、２２はメモリ（データ記憶部）、２３はアドレス発生部、２４は増幅回路、２５は電源供給部、２６は増幅率切替え部、２７は電圧変化部、２８は電圧制御部を示す。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a power supply circuit device that controls a voltage of a power supply generated by a power supply unit based on a reference voltage generated by a reference voltage generation circuit.
[0002]
[Prior art]
FIG. 3 shows a conventional example of a power supply circuit that generates a power supply of a predetermined voltage using a reference voltage generation circuit. The reference voltage generation circuit 1 is configured by, for example, a band gap reference or the like, and generates a reference voltage Vref. The reference voltage Vref is connected to the non-inverting input terminal of the operational amplifier 2, and the output terminal of the operational amplifier 2 is connected to the gate of the P-channel MOSFET 3. The source of the FET 3 is connected to the power supply VDD, and the drain is connected to the ground via a series circuit of the resistors 4 and 5. The common connection point of the resistors 4 and 5 is connected to the inverting input terminal of the operational amplifier 2. The above constitutes the power supply circuit 6.
[0003]
The drain of the FET 3 supplies an operating power of a voltage Vout to the load 7. The voltage Vout is determined by the following equation, where the resistance values of the resistors 4 and 5 are R1 and R2, respectively.
Vout = Vref × (R1 + R2) / R2
Iout is an output current of the power supply circuit 6 supplied via the FET 3 and is a consumption current of the load 7. The load 7 composed of, for example, a motor and its drive circuit is driven and controlled by a control unit 8 which is, for example, a microcomputer. Therefore, the current Iout also changes as the operation state of the load 7 changes.
[0004]
In the power supply circuit 6 having such a configuration, since the level of the reference voltage Vref generated by the reference voltage generation circuit 1 and the offset voltage of the operational amplifier 2 fluctuate due to variations in the manufacturing process, the voltage Vout also varies. . Therefore, it has been necessary to perform trimming by some means so that the voltage Vout becomes a desired level.
[0005]
FIG. 4 shows a power supply circuit 9 to which a configuration for performing such trimming is added. That is, a series circuit 11 of a plurality of resistors 10 is connected to the drain of the FET 3 instead of the resistors 4 and 5. A plurality of switches 13 constituting the switch array 12 are connected between a common connection point of the resistors 10 and an inverting input terminal of the operational amplifier 2.
[0006]
Only one of the switches 13 of the switch array 12 is closed by a switching signal output by the switch control unit 14. The switch controller 14 is provided with correction value data read from the memory 15. That is, the switch control unit 14 is configured as an encoder. The memory 15 is a nonvolatile memory to which data can be written.
[0007]
Then, for example, the operator measures the voltage Vout output from the power supply circuit 9 in the manufacturing line, and adjusts the gain of the amplifier circuit centering on the operational amplifier 2 by the series resistance circuit 11 so that the voltage becomes a predetermined level. Data is written to the memory 15 so as to be adjusted by the pressure ratio. Then, when power is supplied to the system including the power supply circuit 9, the data written in the memory 15 is output to the switch control unit 14, and the switch control unit 14 outputs a switching signal according to the given data. To close only one of the switches 13 of the switch array 12. Then, the gain of the amplifier circuit is determined by the voltage dividing point at which the switch 13 is closed.
[0008]
[Problems to be solved by the invention]
In the power supply circuit 9 configured as described above, if the operation mode (current consumption state) of the load 7 is substantially constant, the voltage Vout can be adjusted to an appropriate level in the operation mode. However, when the operation mode of the load 7 changes variously and the current consumption state greatly changes, the influence of the voltage drop due to the resistance of the power supply wiring cannot be ignored, and the voltage is adjusted by the existing voltage feedback system. There was a problem that it could not be maintained at the level that was set.
[0009]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a power supply circuit device that can adjust a power supply voltage according to a change even when a current consumption state of a load greatly changes. It is in.
[0010]
[Means for Solving the Problems]
According to the power supply circuit device of the first aspect, the voltage control unit refers to the mode switching signal that is output by the operation control unit to switch the operation mode of the control target. It is possible to determine how the state changes. Therefore, by controlling the voltage of the power supply supplied to the control target by the power supply unit based on the mode switching signal, even if the current consumption state of the control target greatly fluctuates, the voltage is set to a predetermined value. Can be controlled.
[0011]
According to the power supply circuit device of the second aspect, the address generation unit of the voltage control unit generates a different address according to the output state of the mode switching signal, and outputs the generated address to the data storage unit. Then, the data stored at the address is read from the data storage unit and applied to the voltage change unit, and the voltage change unit changes the power supply voltage according to the applied data.
[0012]
That is, the operator makes the following settings in advance. First, power is supplied to the control target from the power supply unit in a state where the power supply voltage level in the voltage change unit is appropriately set, and the power supply voltage when the operation mode of the control target changes is measured. Then, the voltage setting in the voltage changing unit is changed while observing the power supply voltage to be at an appropriate level in each operation mode. When the voltage setting is determined, voltage setting data is written and stored in the address of the data storage unit generated by the address generation unit according to each operation mode.
By storing data in the data storage unit as described above, the voltage of the power supply supplied from the power supply unit to the control target can be adjusted in a wide range so as to be at an appropriate level in each operation mode. it can.
[0013]
According to the power supply circuit device of the third aspect, since the voltage changing unit is constituted by the amplification circuit for amplifying the reference voltage and the amplification factor switching unit, the amplification factor of the amplification circuit according to the data provided from the data storage unit. Can be changed in a plurality of stages to adjust the power supply voltage.
[0014]
According to the power supply circuit device of the fourth aspect, the switch control unit selectively closes one of the plurality of switches of the switch array in accordance with the data provided from the data storage unit. Then, the connection state between the resistor in the series resistor circuit and the amplifier circuit changes according to the closed switch, so that the amplification factor of the amplifier circuit changes. Therefore, the amplification factor can be changed by a simple configuration.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. The same parts as those in FIGS. 3 and 4 are denoted by the same reference numerals, and the description thereof will be omitted. The power supply circuit (power supply circuit device) 21 according to the present embodiment replaces the memory 15 of the power supply circuit 9 shown in FIG. 4 with a memory (data storage unit) 22 and has an address generation unit 23 between the control unit 8 and the memory 22. Are arranged.
[0016]
The address generator 23 is configured to generate a plurality of addresses according to a mode switching signal output by the controller (operation controller) 8. The configurations of the memory 22 and the address generator 23 are determined according to the configurations of the series resistance circuit 11 and the switch array 12. For example, if the number of resistors 10 in the series resistor circuit 11 is “17” and the number of switches 13 in the switch array 12 is “16”, the number of data bits in one word of the memory 22 and the address generator 23 Are generated and the number of bits of the address output to the memory 22 is "4".
[0017]
In this case, the switch control unit 14 closes the switches 13 (1) to 13 (16) in accordance with the 4-bit data “0000 (0)” to “1111 (15)” output from the memory 22. The control signal is output as follows.
[0018]
The address generator 23 generates an address corresponding to the number of state transitions of the mode switching signal output by the controller 8. For example, if the number of state transitions is “3”, three types of 4-bit addresses are generated. The memory 22 is configured to always output the data of the memory cell corresponding to the address to the switch control unit 14 when the address is given.
[0019]
The operational amplifier 2, the series resistance circuit 11 and the switch array 12 constitute an amplification circuit 24, and the addition of the FET 3 thereto constitutes a power supply unit 25. The series resistance circuit 11, the switch array 12, and the switch control unit 14 constitute an amplification rate switching unit 26, and the amplification circuit 24 and the amplification rate switching unit 26 constitute a voltage changing unit 27. The voltage control unit 28 is configured by adding the memory 22 and the address generation unit 23 to the amplification factor switching unit 26.
[0020]
FIG. 2 is a flowchart showing a procedure for writing and setting data in the memory 22 of the power supply circuit 21. When performing the following operations, the selection of the switch array 12 by the switch control unit 14 is invalidated for the time being. First, the operator closes one of the switches 13 of the switch array 12 and temporarily sets the gain of the power supply unit 25 (step S1). For example, when Vref = 1.24 V and the voltage setting target of the power supply Vout is Vout = 4.96 V, the switch 13 whose gain (amplification factor) becomes “4” due to the voltage dividing resistance ratio of the series resistance circuit 11. Close.
[0021]
Then, the control unit 8 causes the load (control target) 7 to operate in one of the operation modes (step S2), and closes any switch 13 of the switch array 12 while measuring the voltage of the power supply Vout in each operation mode. The gain is adjusted (step S3). When the switch 13 in which the voltage Vout is set to an appropriate level is selected, data for selecting the switch 13 is stored in a memory cell corresponding to the address of the memory 22 generated by the address generation unit 23 according to the operation mode. Write and store (step S4). Then, when the above processing has been executed for all the operation modes (step S5, “YES”), the processing is ended, and when not executed for all the operation modes (“NO”), the processing returns to step S1.
[0022]
For example, mode switching signals (for example, a speed command signal of the load 7 as a motor) given to the load 7 by the control unit 8 are three types of modes A, B, and C, and the amount of current consumed by the load 7 is Modes A, B, and C increase in this order. In this case, the mode switching signal may be an analog signal, a digital signal of 2-bit data, or a signal output through three independent signal lines. The input side of 23 may be appropriately configured.
[0023]
It is assumed that the addresses generated by the address generation unit 23 according to the operation modes A, B, and C are set to, for example, “0001”, “0010”, and “0100”. Further, the power supply circuit 21 is configured as a constant voltage circuit in which the voltage Vout is constant in any operation mode, and the switches 13 to be selected in each mode are (5) and (5) in order to maintain the voltage Vout constant. 8) and (12), data is written to the memory 22 as follows.

[0024]
After writing data in the memory 22 as described above, the selection of the switch array 12 by the switch control unit 14 is validated. Then, thereafter, the data written in the memory 22 is read in response to the mode switching signal output from the control unit 8 and is provided to the switch control unit 14, and the switch 13 specified by the data is closed. Then, different gains are set in the power supply unit 25 in each operation mode, and the voltage Vout is maintained substantially constant.
[0025]
As described above, according to the present embodiment, the voltage control unit 28 determines how the operation mode of the load 7, that is, how the current consumption state changes, with reference to the mode switching signal output from the control unit 8. Since the power supply unit 25 controls the voltage of the power supply Vout supplied to the load 7 based on the mode switching signal, even if the current consumption state of the load 7 fluctuates greatly, the voltage may be set to a predetermined value. Can be controlled.
[0026]
Then, the address generator 23 of the voltage controller 28 generates an address in response to a different mode switching signal and outputs the generated address to the memory 22, and when the memory 22 outputs data corresponding to the address, the voltage changing unit 27 Since the voltage of the power supply Vout is changed according to the received data, the voltage of the power supply Vout can be adjusted in a wide range so as to be at an appropriate level in each operation mode.
[0027]
Further, since the voltage changing unit 27 is configured by the amplification circuit 24 and the amplification factor switching unit 26, the amplification factor of the amplification circuit 24 is changed in a plurality of stages according to the data supplied from the memory 22, and the voltage of the power supply Vout is changed. Can be adjusted. Furthermore, since the amplification factor switching unit 26 is composed of the series resistance circuit 11, the switch array 12, and the switch control unit 14, the switch control unit 14 selects one of the plurality of switches 13 of the switch array 12 according to given data. Either one is closed to change the gain of the amplifier circuit 24 in the power supply unit 25, so that the gain can be changed and voltage adjustment can be performed with a simple configuration.
[0028]
The present invention is not limited to the embodiment described above and shown in the drawings, and the following modifications or extensions are possible.
The mode switching signal is not necessarily a signal that is directly output to the control target by the operation control unit, and may be a signal that is separately output for the power supply circuit device. For example, when the signal output directly to the control target by the operation control unit is an analog signal, the mode switching signal output to the address generation unit is a signal that changes stepwise according to the change of the analog signal. Is also good.
When a sub-control microcomputer or the like is also provided on the control target side, the mode switching signal may be digital data as described above.
The address generation unit and the data storage unit may be configured integrally.
The power supply voltage is not limited to always being kept constant, and the power supply voltage may be dynamically changed depending on the operation mode depending on the type of the control target.
The control target may also be a microcomputer or the like whose operation mode is switched, such as sleep / wakeup. In this case, the operation control unit is a component that outputs a mode switching signal to the microcomputer according to an external factor. In short, the present invention can be applied to any power supply circuit device that supplies power to a control target whose current consumption changes in a relatively large range according to various operation modes.
[Brief description of the drawings]
FIG. 1 is a functional block diagram showing an electric configuration of a power supply circuit according to an embodiment of the present invention. FIG. 2 is a flowchart showing a procedure for writing data in a memory of the power supply circuit and setting the data. Fig. 1 equivalent diagram showing technology (1)
FIG. 4 is a diagram corresponding to FIG. 1 (part 2);
[Explanation of symbols]
7 is a load (control target), 8 is a control unit (operation control unit), 12 is a switch array, 14 is a switch control unit, 21 is a power supply circuit (power supply circuit device), 22 is a memory (data storage unit), and 23 is An address generation unit, 24 is an amplification circuit, 25 is a power supply unit, 26 is an amplification rate switching unit, 27 is a voltage change unit, and 28 is a voltage control unit.

Claims (4)

A reference voltage generating circuit;
A power supply unit for generating and supplying power of a predetermined voltage based on a reference voltage generated by the reference voltage generation circuit;
When the operation control unit receives a mode switching signal output in accordance with switching the operation mode of the control target, the voltage of the power supplied to the control target by the power supply unit corresponds to the operation mode of the control target. A power supply circuit device, comprising: a voltage control unit that controls an appropriate level. The voltage control unit includes:
An address generation unit that generates different addresses according to the output state of the mode switching signal;
Given the address, a data storage unit from which data stored at the address is read;
2. The power supply circuit device according to claim 1, further comprising a voltage change unit that changes a power supply voltage in accordance with the data read from the data storage unit. The voltage changing unit includes:
An amplifier circuit for amplifying the reference voltage;
3. The power supply circuit device according to claim 2, further comprising an amplification factor switching unit configured to switch an amplification factor of the amplification circuit in a plurality of stages. The amplification factor switching unit,
A series resistor circuit in which a plurality of resistors for setting the amplification factor of the amplifier circuit are connected in series;
A switch array including a plurality of switches connected between each common connection point of the series resistance circuit and an input terminal of the amplification circuit;
4. The power supply according to claim 3, further comprising a switch control unit that selectively closes one of the switches constituting the switch array in accordance with the data read from the data storage unit. Circuit device.

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