JPH0298705A - Electronic equipment - Google Patents

Abstract

PURPOSE:To obtain the optimum driving condition even when a power source fluctuates without using a stabilized power source by selecting an appropriate one of tables corresponding to the output of a power source part, and performing the driving control of a driving part by using the table. CONSTITUTION:The optimum one of control tables T1-Tn for the driving part 4 is selected corresponding to the fluctuation of the output voltage of the power source part PS, and it is used in the control of the driving part 4. Therefore, since it is enough to comprise each control table so as to perform the optimum driving only in the range of the output voltage of a corresponding power source part PS, it is not required to set the driving condition with allowance. In such a way, it is possible to perform the optimum driving control of the driving part even when the state of the output of the power source fluctuates without using the stabilized power source.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention has a power supply unit that supplies power to a drive unit that performs a predetermined operation of an electronic device, particularly an apparatus, and furthermore, this power supply unit has a This relates to electronic equipment whose power output may fluctuate.

[Background Art] Conventionally, in various electronic devices, a battery or a power supply circuit that converts a commercial AC power source into direct current has been used as a power source for the device. 2. Description of the Related Art Drive systems for semiconductor devices, motors, solenoids, and the like of electronic equipment are generally supplied with power through predetermined stabilization such as constant voltage control or constant current control. However, some circuits such as constant voltage power supplies and constant W current power supplies have low power efficiency, and the device configuration becomes complicated, so it would be ideal if they could be done without them. .

On the other hand, currently, various electronic devices are widely used with a configuration in which each part of the device is controlled by a programmable control section using a microcontroller. A control table that stores data for the drive system is provided in the program memory, and data such as ambient temperature, humidity 2, and various switch settings are input into this table to control the drive voltage, drive current, etc. of the drive system motor, solenoid, etc. Determine the driving period, etc.

[Problems to be Solved by the Invention] In such a configuration, depending on the configuration of the control table, control can be performed so that normal operation can be performed even if there is a voltage fluctuation. If a regulated power supply is not used, in that case the data structure of the control table must be configured to allow operation over the full range of power supply fluctuation voltages or semi-fluency. If this is done, it is necessary to set operating conditions with a margin for power supply fluctuations, which necessitates increasing the driving time of the drive system, driving voltage, driving current, etc., which reduces power efficiency and There is a problem in that optimal control cannot be performed in terms of operating speed.

In view of the above problems, Amei's five problems are to provide an electronic device that does not require a stabilized power source and can obtain optimal driving conditions even when the power source fluctuates.

[Means for Solving the Problems] In order to solve the above problems, the present invention includes a power supply unit that supplies power to a drive unit that performs a predetermined operation of the device, and furthermore, the drive unit of the power supply unit In an electronic device in which a power output to a section may fluctuate, a plurality of memory tables storing information for determining driving conditions of the drive section according to a predetermined input signal, and means for detecting an output state of the power supply section are provided. and a control means for selecting an appropriate one of the plurality of memory tables according to the output of the detection means and controlling the drive of the drive unit using the selected memory table. did.

[Operation] According to the above configuration, even if the state of the power supply output changes, an appropriate memory table is selected from among the plurality of memory tables that connect a predetermined input amount to the drive condition of the drive unit, and this memory table is Based on the information stored in the drive unit, optimal drive control of the drive unit can be performed depending on the state of the power supply.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

FIG. 1 shows the configuration of the main parts of an electronic device adopting the present invention. In the figure, the symbol PS is the power supply section of the device, which is constructed of a rectifier/smoothing circuit 2 consisting of a transformer L that transforms the input of a commercial AC power supply PSC to a predetermined voltage, a diode D, and a capacitor C. In this case, the output of the power supply section PS is input to the drive section 4 without being stabilized in any way.

The drive unit 4 includes a motor, a solenoid, various electronic circuits using semiconductors, a display, and the like. Drive part 4
is controlled by a control g# section 5 comprising a microprocessor or the like, such as various operation timings such as drive conditions, drive period, drive voltage, or drive current.

Here, the control unit 5 is constituted by a one-chip CPU, and has a built-in ROM 6 that stores programs to be described later. Power is supplied to the control unit 5 via a control unit power supply 7 that stabilizes the output of the power supply unit PS. This control unit power supply 7 is for supplying power to the control unit 5 which is made of a semiconductor chip or the like with low power consumption.
A very simple stabilization circuit using a terminal regulator etc. is sufficient.

In this embodiment, when determining the operating conditions of the drive unit 4, the control unit 5 inputs drive conditions such as various switch settings, ambient temperature, and humidity from input units such as sensors and switches (not shown), and stores them in the ROM 5. input into the control table provided in
The final drive period, drive voltage/current, drive interval, etc. of the drive section 4 are determined. However, unlike in the past, there is not one type of control table, but there is a code T in the ROMB.
Stores n control tables numbered 1 to Tn.

All of the tables T1 to Tn are not used, but one of them is selected depending on the output state of the power supply section PS. Various parameters such as voltage, M in a predetermined load state, current, etc. can be considered as the output state for determining the table selection of the power supply section PS, but here, it is assumed to be the output voltage of the power supply section PS. The output voltage of the power supply section PS is detected by the voltage detection circuit 3 and inputted to the control section 5. The voltage detection circuit 3 includes a detection resistor connected between a power supply line and ground, and an A/D converter that digitizes the detection voltage of the detection resistor with a predetermined resolution.

Next, the operation of the above configuration will be explained in detail with reference to the flowchart shown in FIG.

FIG. 2 shows the flow of the program of the control unit 5 stored in the ROMB of FIG.

When AC is input from the commercial AC power supply PSC to the primary side of the transformer 1 of the power supply unit PS via a power switch (not shown), the output of the rectifying and smoothing circuit 2 is converted to DC according to the turns ratio of the transformer 1. A voltage is generated. This voltage is not stabilized and fluctuates under the influence of voltage fluctuations of the commercial AC power supply PSC, the load condition of the drive unit 4, and the like.

After the power is turned on, the control unit 5 takes in the output of the voltage detection circuit 3 according to the procedure shown in FIG.
n types of control tables T1 to Tn stored in B are selected. Steps 5l-S3 in FIG.
This is a determination step in which n-1 pieces of boundary voltage data for selecting 1 to Tn are compared with the detected voltage of the voltage detection circuit 3.

The boundary voltage determined in step 5l-S3 is A,
B, . . . V, and the step of this voltage is determined by the expected voltage fluctuation of the power supply unit PS and the number n of tables to be selected. Of course, the increments of this boundary voltage do not necessarily have to be constant. Step 5t-53
Then, the output value of the voltage detection circuit 3 is the boundary voltage A, respectively.
B, . . . It is determined whether or not there are any one of the following, and if any of the steps is affirmative, the process moves to the n control table selection routine of steps 54 to S7.

Here, the control tables T1-Tn are assigned in order from the one with the highest detected voltage, and in steps 54-S7, the control tables TI, T2. ...Tn-1, 7n are selected. When one of the table selection routines ends, the control section 5 shifts to a known drive control routine. In this drive control, various inputs such as environmental conditions and switch settings are given to one of the selected tables, drive condition data of the drive section 4 is obtained as an output amount, and the drive section 4 is controlled according to this drive condition data. Various drive conditions such as drive current, drive voltage, and drive timing are determined.

According to the embodiment below, the optimum control table Tl-Tn for the drive section 4 is determined according to the fluctuation of the output voltage of the power supply section PS.
One of them is selected and used to control the drive unit 4.

Therefore, each control table can be configured to perform optimal driving only within the output voltage range of the corresponding power supply unit PS, so there is no need to set driving conditions with a margin as in the past. Therefore, at that power supply voltage, MJ, il! ! The most efficient or fastest driving conditions can be set.

In the embodiment described in 5, for example, step S in FIG.
In 3, the boundary voltage is not determined to be 2 or less,
Even if the power input drops to a level where the device cannot operate, the control tape selection Tn will be selected, so there is a possibility that normal operation will not be maintained. In view of this point, it is conceivable to set upper and lower limits of the operable power supply voltage and perform control as shown in FIG. 3.

Step 5ol-314 in FIG. 3 is step 5 in FIG.
1 to S3, the voltage detection circuit 3 and the boundary voltage A-Z are sequentially compared, but steps Stt and S14
is compared with the upper and lower boundary voltages A and Z of the power supply voltage that can guarantee normal operation.

Step S12. If S13... is affirmed, each of the control tables Tl-Tn is selected in the same way as in FIG. If it is determined that the voltage is below the boundary voltage Z, the operation is stopped and a warning is generated by sounding two buzzers. As a warning method,
In addition to the buzzer, it may be possible to light up a lamp, display warning characters, etc.

With such a configuration, it is possible to select a control table according to the power supply voltage only within the range of the appropriate power supply voltage, and set appropriate drive conditions, and if there is an abnormality in the power supply voltage, further operation can be performed. This prevents device failures and malfunctions.

In the embodiments shown in FIGS. 1 to 3, the control table for the drive unit 4 is determined when the power is turned on, and the drive is then performed using the selected control table. In such a configuration, the commercial AC power supply PSC
Therefore, the procedure shown in Fig. 2 is performed not only when the power is turned on, but also every time an operation command for the drive unit 4 is executed, and the control table is selected appropriately. If corrected, optimal and efficient operation will be possible based on the selection of a control table appropriate for the operating mode.

Furthermore, 71! as shown in Figure 1! In the configuration of the source PS, the power supply voltage may vary depending on the number of loads to which power is supplied or variations in load conditions. In consideration of such cases, for example, when the drive section 4 is composed of multiple motors, solenoids, etc., one motor or solenoid is driven directly in front of the other, and two abnormal loads are driven at the same time. It is better to use different table data.

In other words, even if one of the control tables T in the ROM 5 is divided into one for driving a single load and one for driving a plurality of loads, and these tables are selected depending on the control state, The number of control tables corresponding to the same power supply voltage may be appropriately determined depending on the number of loads driven simultaneously.

Although the above configuration has been described in which the power supply unit transforms and converts commercial AC power to DC, it goes without saying that the above configuration can be implemented in electronic MSs that use various power supply devices such as dry batteries, rechargeable batteries, and solar cells.

[Effects of the Invention] As is clear from the above, according to the present invention, the device includes a power supply unit that supplies power to a drive unit that performs a predetermined operation of the device,
Moreover, in an electronic device in which the power output of the power supply section to the drive section may fluctuate, a plurality of memory tables storing information for determining the drive conditions of the drive section according to a predetermined input amount, and the ? means for detecting the output state of the source, and selecting one appropriate memory table from the plurality of memory tables according to the output of the detecting means, and using the memory table to detect the output state of the drive unit. Since the configuration is equipped with a control means for controlling the drive of FfB,
Unlike conventional methods, there is no need to set control conditions that are inefficient in terms of power efficiency or processing efficiency by taking into account all possibilities of power supply fluctuations. An excellent effect is that an appropriate memory table is selected from among multiple memory tables connected to the memory table, and optimal drive control can be performed in terms of power efficiency and processing efficiency depending on the power supply status based on the information stored in this memory table. There is.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of main parts of an electronic device adopting the present invention, and FIGS. 2 and 3 are flowcharts showing control procedures of different control units. 1...Transformer 2...Rectifier smoothing circuit 3...
・Voltage detection circuit 4...Drive section 5...Control section
6...ROMT1~Tn...Control table

Claims (1)

[Claims] 1) In an electronic device that has a power supply unit that supplies power to a drive unit that performs a predetermined operation of the device, and in which the power output of this power supply unit to the drive unit may fluctuate, the driving conditions of the drive unit a plurality of memory tables storing information for determining the output state according to a predetermined input amount, means for detecting the output state of the power supply section, and an appropriate memory table among the plurality of memory tables according to the output of the detection means. 1. An electronic device comprising: a control means for selecting one of the drive units and controlling the drive unit using the selected memory table.