JPH11178326A - Dc power supply unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain reduction in electric power consumption and improvement in a power factor by storing switching data continuing a plurality of times in a memory, and conducting on/off-control, based on the continuous switching data corresponding to a switching controlled variable subjected to one calculation for ever continuous switching period. SOLUTION: The charging potential of a capacitor 6 is decreased by electric power consumption of load circuits 2, 3 and 4 during control period by a power source microcomputer 16. When a central processing unit conducts controlled variable calculation and detects a decrease in the charging potential, it calculates switching control variable according to the decrease amount and other detected voltage, and selects continuous switching data to be used next. When a pulse signal from the power source microcomputer 16 is changed into an L-level, a switching transistor 8 is turned off, and induced voltage of a coil 9 is added to a diode 7, so that charging current flows into the capacitor 6. A load microcomputer 4 supplies power from a power module 2 to a motor 3, thereby driving the motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC power supply device used for generating a DC voltage from a commercial power supply in an air conditioner, a washing machine, or the like, and more particularly, to a rectifier bridge circuit for rectifying an AC voltage, and The present invention relates to an improvement for suitably improving a power factor in a DC power supply device having a capacitor for smoothing a rectified voltage and suppressing a harmonic current leaking to a commercial power supply.

[0002]

2. Description of the Related Art FIG. 20 is a block diagram showing a configuration of a conventional DC power supply device and its peripheral devices. In the figure,
Reference numeral 1 denotes an AC power supply such as a commercial power supply, 2 denotes a power module to which a DC voltage is input and appropriately supplies the DC voltage, 3 denotes a motor to which power is supplied by the power module 2, and 4 denotes the motor Power module 2 to P
This is a load microcomputer controlled by the WM method or the like. Then, the power module 2 and the motor 3
And a load microcomputer 4 constitute a load circuit.

[0005] Reference numeral 5 denotes an AC power supply 1 and load circuits 2, 3,
4 is a rectifying bridge circuit arranged in series between
6 is the rectifying bridge circuit 5 and the load circuits 2, 3, 4
And 7 is a capacitor disposed in parallel between the rectifier bridge circuit 5 and the capacitor 6 so that a current flows only from the AC power supply 1 to the load circuits 2, 3, and 4. The diode is disposed in the first. The DC power supply device includes the rectifying bridge circuit 5, the capacitor 6, and the diode 7.

Next, the operation will be described. The AC voltage output from the AC power supply 1 is rectified by the rectifying bridge circuit 5 and becomes a rectified voltage that oscillates in one polarity when viewed from the ground potential. The capacitor 6 is charged by the rectified voltage. The finally obtained charging potential of the capacitor 6 is lower than the maximum peak value of the rectified voltage by the forward voltage drop of the diode 7.

When power is supplied to the motor 3 via the power module 2 in such a state, the charging potential of the capacitor 6 decreases by an amount corresponding to the supplied power. When the potential decreases, the charging by the rectified current is restarted. Therefore, normally, the potential of the capacitor 6 is stabilized at the potential, and the drive control of the motor 3 is performed in that state.

However, in the above-described conventional apparatus, the AC power supply 1 is maintained so that the capacitor 6 disposed in parallel between the AC power supply 1 and the load circuits 2, 3, and 4 is maintained at a constant charging potential.
Since the power is supplied from the power supply, there are the following problems.

More specifically, once charged, the capacitor 6 is charged so as to compensate for the electric charge consumed by the load circuits 2, 3, and 4. Therefore, AC power supply 1
When viewed from the viewpoint, the current starts to flow only when the rectified potential becomes higher than the potential of the capacitor 6 by the forward drop voltage of the diode 7. In addition, since the capacity of the capacitor 6 used to maintain a constant potential in motor control or the like is extremely high, the AC power supply 1 is in a state close to being grounded to the ground potential during the charging period. Therefore, a large amount of charging current flows. That is, the relationship between the AC voltage and the AC current in the AC power supply 1 is as shown in FIG.
In the period, a large amount of alternating current flows in a part of the period. Therefore, in the above-described conventional DC power supply device, the power factor is low, and is generally reduced to about 0.7. Conversely speaking, since the AC current contains a large amount of harmonic current components, the harmonic current that leaks out to the AC power supply side becomes extremely large and is connected to the same AC power supply. In addition, if there is another device, it may cause a malfunction.

Therefore, as disclosed in Japanese Patent Application Laid-Open No. 4-26379, a technique of improving a power factor using an active smoothing filter IC and suppressing a harmonic component leaking to an AC power supply is used. .

FIG. 22 is a block diagram showing the configuration of another conventional DC power supply device and its peripheral devices. In the figure, reference numeral 9 denotes a coil disposed in series between the rectifying bridge circuit 5 and the capacitor 6, and 8 denotes a switching transistor disposed in parallel between the coil 9 and the capacitor 6. Reference numeral 11 denotes a rectified voltage detecting resistor for detecting the rectified voltage, 12 denotes a detection coil for detecting a voltage generated in the coil 9, and 13 is disposed between the switching transistor 8 and the ground. , 14 and 15 are charging voltage detecting resistors for detecting the charging voltage of the capacitor 6, and 29 are input with these four detected voltages, and the switching is performed in response thereto. An active smoothing filter IC for controlling ON / OFF of the transistor 8.

Next, the operation will be described. When the active smoothing filter IC 29 detects that the charging voltage has dropped by the detection voltage drop of the charging voltage detection resistors 14 and 15, the active smoothing filter IC 29 activates the switching transistor 8 for a time corresponding to the detection voltage of the rectification voltage detection resistors 10 and 11. Control to ON. As a result, one end of the coil 9 is grounded to the ground potential, and a rectified voltage and a current corresponding to the inductance of the coil 9 flow through the coil 9, and the coil 9
Induced voltage is excited at both ends of the. Next, the active smoothing filter IC 29 detects the induced voltage of the coil 9 based on the detection voltage of the detection coil 12, and controls the switching transistor 8 to be turned off when the voltage approaches the rectified voltage. Then, a voltage obtained by adding the induced voltage of the coil 9 to the rectified voltage is applied to the AC power supply 1 side of the diode 7, whereby a charging current flows to the capacitor 6. FIG. 23 is a diagram showing a relationship between an AC voltage and an AC current obtained by such a switching operation.

As described above, the active smoothing filter I
ON / O the switching transistor 8 using C29
By performing the FF control, a charging current can flow to the capacitor 6 regardless of the phase of the rectified voltage. As shown in FIG. 23, such switching control can increase the fundamental wave component included in the AC current by performing ON / OFF control about every 5 μs, thereby improving the power factor. The effect and the effect of suppressing the harmonic current can be obtained.

[0012]

Since another conventional DC power supply device is configured as described above, it is possible to obtain a power factor improving effect and a harmonic current suppressing effect. However, an active smoothing filter IC is used. Need to do so, and secondary problems arise.

More specifically, the active smoothing filter IC determines the presence or absence of control and the degree of control by comparing the levels of various detection voltages with a comparator or the like, and outputs a pulse signal having a pulse width corresponding to the control. Output analog circuit. Therefore, although they are made into ICs, the scale and current consumption are large, and the price is high.

Further, since the analog circuit is integrated into an IC, various detection resistors and coils connected to the outside need to have an impedance value capable of varying a detection voltage within a predetermined range. In addition, since the supply current is adjusted by ON / OFF control of the switching transistor, the accuracy of these detected voltages is also required to be very high. Once manufacturing including the load circuit has been performed, the detection resistor and coil must be replaced to make adjustments to obtain a predetermined control ability.

Therefore, as disclosed in the above publication, it is conceivable to perform ON / OFF control of the switching transistor using a general-purpose microcomputer as a digital circuit instead of the active smoothing filter IC.

However, when a general-purpose microcomputer is used instead of the active smoothing filter IC as shown in the above-mentioned publication, as shown in FIG.
It is necessary to detect various detection voltages for each s, perform an operation corresponding to the detected voltages, and output a pulse signal having a pulse width corresponding to the operation result. In order to execute such a series of control operations in such a short period of time, even with the current microcomputer technology, it cannot be realized unless the latest one is used, which results in reduction of current consumption and cost. I could not expect much effect. Therefore, it has not been actually used in air conditioners and the like.

The present invention has been made to solve the above-described problems, and can perform ON / OFF control of a switching transistor without using the latest microcomputer in the current technology, and thus, the conventional technology. It is an object of the present invention to obtain a DC power supply device capable of obtaining a power factor improving effect and a harmonic current suppressing effect with low current consumption and low cost.

[0018]

In the DC power supply according to the present invention, the control means for controlling ON / OFF of the switching transistor stores continuous switching data for continuously switching the switching transistor a plurality of times. A switching data memory, and a central processing unit that calculates a switching control amount of the switching transistor once each in the continuous switching period in which the switching is performed a plurality of times, based on the continuous switching data according to the switching control amount. This controls ON / OFF of the switching transistor.

In the DC power supply device according to the present invention, the switching data memory stores a plurality of continuous switching data in each divided period obtained by dividing one cycle of the AC voltage output from the AC power supply into a plurality of divided periods. The processing device selects one continuous switching data according to the switching control amount, and controls ON / OFF of the switching transistor based on the continuous switching data.

In the DC power supply device according to the present invention, the switching data memory stores one continuous switching data for each divided period obtained by dividing one cycle of the AC voltage output from the AC power supply into a plurality of periods, and performs central processing. The device corrects ON / OFF in the continuous switching data in accordance with the switching control amount, and controls ON / OFF of the switching transistor based on the corrected continuous switching data.

In the DC power supply device according to the present invention, the control means has a direct memory access controller for sequentially outputting switching data relating to predetermined continuous switching data from the switching data memory, and the continuous switching by the direct memory access controller. The ON / OFF of the switching transistor is controlled in accordance with the output of data.

In the DC power supply device according to the present invention, the control means has a phase control circuit for synchronizing the ON / OFF switching timing of the switching transistor with the AC power supply.

In the DC power supply according to the present invention, the control means has the input data memory for storing the compensation operation result by the central processing unit performing the compensation operation on the input data.

In the DC power supply device according to the present invention, the control means causes the central processing unit to switch the switching transistor on and off based on a change characteristic of a plurality of input data relating to the same input.
It has an input data memory for calculating control basic data for N / OFF control and for storing the control amount.

In the DC power supply according to the present invention, the control means receives load status information on a load circuit,
This is to change continuous switching data for ON / OFF control of the switching transistor based on the load status information.

In the DC power supply device according to the present invention, the control means controls the switching transistor so that the current flowing into the capacitor is suppressed immediately after the load circuit is turned on.
This is for changing continuous switching data for N / OFF control.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a block diagram showing a configuration of a DC power supply device and its peripheral devices according to Embodiment 1 of the present invention. In the figure, 1 is an AC power supply such as a commercial power supply, 2 is a power module to which a DC voltage is input and appropriately supplies the DC voltage, 3 is a motor to which power is supplied by the power module 2, A load microcomputer 4 controls the power module 2 by a PWM method or the like. The power module 2, the motor 3, and the load microcomputer 4
Constitute a load circuit.

Reference numeral 5 denotes an AC power supply 1 and load circuits 2, 3,
4 is a rectifying bridge circuit arranged in series between
6 is the rectifying bridge circuit 5 and the load circuits 2, 3, 4
And 7 is a capacitor disposed in parallel between the rectifier bridge circuit 5 and the capacitor 6 so that a current flows only from the AC power supply 1 to the load circuits 2, 3, and 4. The diode is disposed in the first. Further, 9 is a coil disposed in series between the rectifying bridge circuit 5 and the capacitor 6, and 8 is a switching transistor disposed in parallel between the coil 9 and the capacitor 6, and 10, 11 Is a rectified voltage detecting resistor for detecting the rectified voltage, 12 is a detection coil for detecting the voltage generated in the coil 9, and 13 is disposed between the switching transistor 8 and the ground. Switching current detecting resistors for detecting a switching current, charging voltage detecting resistors 14 and 15 for detecting a charging voltage of the capacitor 6, and 16 for receiving these four detected voltages, and a switching transistor corresponding thereto. 8 is a power supply microcomputer (control means) for controlling ON / OFF of the power supply 8. The DC power supply device is composed of the above members.

FIG. 2 is a block diagram showing an internal circuit configuration of the power supply microcomputer according to the first embodiment of the present invention. In the figure, reference numeral 19a denotes an AD converter to which each of the above detection voltages is input and which converts the input level signal into a digital signal.
An I / O port having a converter 19a, 20 is a PWM generation circuit that outputs a pulse signal to the switching transistor 8, and 18 is the I / O port 1
9 is a central processing unit that calculates a switching control amount based on the data of No. 9 and controls the pulse output from the PWM generation circuit 20 in accordance therewith, and 21 stores continuous switching data corresponding to various switching control amounts. RO
M (switching data memory), and 23 is a data bus used for data transfer between these members. In the first embodiment, the continuous switching data is configured as a data string including ten pieces of switching data.

Next, the operation will be described. FIG. 3 is a flowchart showing a control amount calculation interrupt sequence in the central processing unit according to Embodiment 1 of the present invention. In the control amount calculation interrupt sequence, an interrupt request is generated every 50 μs by a timer (not shown) or the like, and is executed in response thereto. In the figure, ST1 is a reading step for reading data of the I / O port 19,
ST2 is a control amount calculating step of calculating a switching control amount using the read data as control basic data, and ST3 is a data selecting step of selecting continuous switching data corresponding to the switching control amount. As a result, the central processing unit 18 changes the continuous switching data every 50 μs.

FIG. 4 is a flowchart showing an interrupt sequence for switching control in the central processing unit according to the first embodiment of the present invention. The switching control interrupt sequence is 5 μs by a timer (not shown) or the like.
Each time an interrupt request is generated, it is executed in response to the request. In the figure, ST4 is a data transfer step of transferring one of the continuous switching data selected by the control amount calculation interrupt sequence to the PWM generation circuit 20. Thus, based on the plurality of switching data constituting the continuous switching data, the PWM generation circuit 20 sets the O of the switching transistor every 5 μs.
N / OFF control will be executed.

When the charging potential of the capacitor 6 decreases due to the power consumption of the load circuits 2, 3, and 4 while the above-described control is being executed in the power supply microcomputer 16, the central processing unit 18 controls the control amount. In calculation step ST2, the decrease in the charging potential is detected. Then, a switching control amount is calculated according to the amount of decrease in the charging potential and another detected voltage at that time, and continuous switching data to be used next is selected (ST3).

At the same time, the central processing unit 18
The switching data of the continuous switching data is set in the PWM generation circuit 20 every 5 μs, whereby the switching transistor 8 is turned on every 5 μs for a time corresponding to the pulse width. As a result, one end of the coil 9 is grounded to the ground potential every 5 μs, a rectified voltage and a current corresponding to the inductance of the coil 9 flow through the coil 9, and an induced voltage is excited at both ends of the coil 9. .

Next, when the pulse signal from the power supply microcomputer 16 changes to low level, the switching transistor 8 is controlled to be turned off, and the induced voltage of the coil 9 is added to the rectified voltage on the AC power supply side of the diode 7. The applied voltage is applied, and a charging current flows to the capacitor 6.

By the above control, the charging potential of the capacitor 6 is stabilized to a potential lower than the maximum peak value of the rectified voltage by the forward drop voltage of the diode 7, and in this state, the load microcomputer 4 Electric power is supplied from the power module 2 to the motor 3, and the motor 3 can be driven appropriately.

FIG. 5 is an example of a timing chart obtained by a series of operations in the DC power supply according to Embodiment 1 of the present invention as described above. In the figure, V is a waveform corresponding to a half cycle of the rectified voltage, I is a charging current flowing into the coil 9 from the power supply side, Iave is an average value of the charging current, and a pulse signal is a switching transistor 8.
, And the sampling timing is the sampling timing of the input data by the central processing unit 18.

As described above, according to the first embodiment, the ROM storing the continuous switching data for continuously switching the switching transistor 8 a plurality of times and the ROM in the continuous switching period in which the switching is performed a plurality of times are performed. A central processing unit 18 for calculating the switching control amount of the switching transistor 8 is provided once each, and the ON / OFF of the switching transistor 8 is controlled by these.
Since sampling may be performed once for each of a plurality of switching periods and control may be performed in accordance with the sampling, the processing load of the central processing unit 18 per unit time is reduced.

According to the first embodiment, the ROM
21 stores a plurality of continuous switching data for each divided period obtained by dividing one cycle of the AC voltage output from the AC power supply 1 into a plurality of divided periods. Since the switching data can be determined a plurality of times simply by selecting the switching data, it is not necessary to correct the continuous switching data one by one, and the processing load per unit time of the central processing unit 18 is further reduced. Has an effect.

Therefore, without using the latest microcomputer in the current technology, the ON / O is performed every 5 μs.
Since the FF control can be performed, it is possible to obtain a favorable power factor improving effect and a harmonic current suppressing effect by increasing the fundamental wave component. As a result, the active smoothing filter IC
And the effect that the power factor improving effect and the harmonic current suppressing effect can be obtained with low current consumption and low cost, which could not be obtained when using a microcomputer that performs the same operation instead. There is.

Embodiment 2 FIG. 6 is a block diagram showing an internal circuit configuration of a power supply microcomputer according to Embodiment 2 of the present invention. In the drawing, reference numeral 21 denotes a ROM for storing one continuous switching data for each divided period obtained by dividing one cycle of the AC voltage output from the AC power supply 1 into a plurality of periods, and 22 is generated based on the continuous switching data. RAM (switching data memory) for storing the corrected continuous switching data. The other configuration is the same as that of the first embodiment, and thus the same reference numerals are given and the description is omitted.

Next, the operation will be described. FIG. 7 is a flowchart showing a control amount calculation interrupt sequence in the central processing unit 18 according to the second embodiment of the present invention.
In the figure, ST5 is a data generation step of correcting the continuous switching data read from the ROM 21 based on the switching control amount obtained in the control amount calculation step ST2, and generating the corrected continuous switching data. The other steps are the same as those in the first embodiment, and thus the same reference numerals are given and the description is omitted.

The switching transistor 8 is
Each time the switching control interrupt sequence is executed, ON / OFF control is performed based on a plurality of switching data constituting the corrected continuous switching data.

With the above-described control, the DC power supply according to the second embodiment detects a decrease in the charging potential of capacitor 6 and performs charging to compensate for the decrease, and changes the potential of capacitor 6 to a predetermined charging potential. In this state, power is supplied from the power module 2 to the motor 3 by the load microcomputer 4, and the motor 3 can be driven appropriately.

According to the second embodiment, the central processing unit 18 only needs to perform sampling once for each of a plurality of switching periods and perform control in accordance with the sampling. 18 can reduce the processing load per unit time, and the low current consumption which could not be obtained by using an active smoothing filter IC or a microcomputer having the same operation instead of the active smoothing filter IC. There is an effect that the power factor improving effect and the harmonic current suppressing effect can be obtained at a low cost.

The ROM 21 stores one continuous switching data for each divided period obtained by dividing one cycle of the AC voltage output from the AC power supply 1 into a plurality of periods. Since the ON / OFF of the continuous switching data is corrected accordingly, it is possible to suppress an increase in cost due to a memory such as the ROM 21 or the like.

Embodiment 3 FIG. 8 is a block diagram showing an internal circuit configuration of a power supply microcomputer according to Embodiment 3 of the present invention. In the figure, reference numeral 24 denotes a direct memory access controller (hereinafter referred to as a DMA controller) for sequentially outputting a plurality of switching data relating to predetermined continuous switching data from the ROM 21 based on a command from the central processing unit 18. The other configuration is the same as that of the first embodiment, and thus the same reference numerals are given and the description is omitted.

Next, the operation will be described. FIG. 9 is a flowchart showing a control amount calculation interrupt sequence in the central processing unit according to Embodiment 3 of the present invention. In the figure, ST6 is a transfer instruction step of outputting a transfer instruction command to the DMA controller 24 in response to the interrupt. And the switching transistor 8 is
Each time the switching control interrupt sequence is executed, ON / OFF control is performed based on a plurality of switching data constituting the corrected continuous switching data.

With the above-described control, the DC power supply according to the third embodiment detects a decrease in the charging potential of capacitor 6 and performs charging to compensate for the decrease, and changes the potential of capacitor 6 to a predetermined charging potential. In this state, power is supplied from the power module 2 to the motor 3 by the load microcomputer 4, and the motor 3 can be driven appropriately.

As described above, according to the third embodiment, the power supply microcomputer 16 has the DMA controller 24 for sequentially outputting the switching data relating to the predetermined continuous switching data from the ROM 21,
Since the ON / OFF of the switching transistor 8 is controlled in accordance with the continuous output of the switching data by the DMA controller 24, the central processing unit 18 does not need to directly call the data in the ROM 21 and write it into the PWM generation circuit 20. The processing load per unit time of the central processing unit 18 is further reduced as compared with the first embodiment.

Embodiment 4 FIG. 10 is a block diagram showing a configuration of a DC power supply device and its peripheral devices according to Embodiment 4 of the present invention. In the figure, D0 indicates the output voltage of the rectifier bridge circuit 5 and the microcomputer 16 for power supply.
This is a signal line for transmitting an input phase signal to be input to the. The other parts are the same as those of the third embodiment, so the same reference numerals are given and the description is omitted.

FIG. 11 is a block diagram showing an internal circuit configuration of a power supply microcomputer according to Embodiment 4 of the present invention. In the figure, reference numeral 26 denotes a timer counter which outputs a timing signal for outputting the above two interrupt signals to the central processing unit 18, and 25 denotes a timer register which stores a count value counted by the timer counter 26. A phase comparison circuit 27 compares the phase of the timer count value with the phase of the input phase signal, and outputs a phase difference detection signal corresponding to the phase difference. A phase control circuit 30 includes a timer register 25, a timer counter 26, and a phase comparison circuit 27. The other configuration is the same as that of the third embodiment, so that the same reference numerals are given and the description is omitted.

Next, the operation will be described. The timer counter 26 counts based on the count value stored in the timer register 25, and every 5 μs, and
An interrupt signal is output every μs. Then, the central processing unit 18 executes various interrupt sequences in response to the interrupt signal.

When the phase comparison circuit 27 detects the phase difference between these two inputs during such operation, it outputs a phase difference detection signal corresponding to the phase difference. In response to this, the central processing unit 18 changes the value of the timer register 25, thereby turning on / off the switching transistor 8 at a timing synchronized with the AC voltage input to the DC power supply.
Can be controlled.

As described above, according to the fourth embodiment, the power supply microcomputer 16 has the phase control circuit 30 for synchronizing the ON / OFF switching timing of the switching transistor 8 with the AC power supply. It is possible to reduce a control error based on the phase difference, and to prevent an excessive current from flowing to the switching transistor 8 or the like due to the error.

Embodiment 5 FIG. 12 is a block diagram showing an internal circuit configuration of a power supply microcomputer according to Embodiment 5 of the present invention. In the figure, reference numeral 22 denotes a RAM (input data memory) for storing compensation input data obtained by a compensation operation by the central processing unit 18 based on the input data. Other configurations are the same as those of the fourth embodiment.
Therefore, the description is omitted.

Next, the operation will be described. FIG. 13 is a flowchart showing a control amount calculation interrupt sequence in the central processing unit according to Embodiment 5 of the present invention. In the figure, ST7 corrects the input data read in the reading step ST1 and calculates the calculation result in the RAM 22.
Is a correction calculation step to be stored. The other operations are the same as those in the fourth embodiment, and thus the same reference numerals are given and the description is omitted. The arithmetic expression of the correction operation varies depending on the application, required control accuracy, and the like. However, if it is simple, the input data may be multiplied by a predetermined coefficient.

As described above, according to the fifth embodiment, the central processing unit 18 corrects the input data, stores the correction calculation result in the RAM 22, and performs the correction calculation based on the correction calculation stored in the RAM 22. Therefore, the switching control amount can be changed by changing the formulas and coefficients used in the correction calculation, and thus the control operation according to the charge potential of the capacitor 6 can be changed. be able to. Therefore, it is possible to obtain a predetermined control ability only by adjusting the parameters and the like used for the correction operation after the DC power supply is once manufactured, and to perform the adjustment without replacing the detection member and the like. .

Embodiment 6 FIG. FIG. 14 is a block diagram showing a configuration of a DC power supply device and its peripheral devices according to Embodiment 6 of the present invention. FIG. 14 is the same as that of the fifth embodiment except that the detection coil 12 is deleted from FIG. 10 in the fourth embodiment.

Next, the operation will be described. FIG. 15 is a flowchart showing a control amount calculation interrupt sequence in the central processing unit according to Embodiment 6 of the present invention. In the figure, ST9 calculates a coil generation voltage to be detected by the detection coil 12 based on the other input data read in the reading step ST1 and other input data stored in the RAM 22, and calculates the detected voltage from the detection coil 12. Is a data generation step of storing the basic data in the RAM 22 instead of the basic data. The other operations are the same as those in the fifth embodiment, and thus the same reference numerals are given and the description is omitted. In the following, the correction calculation step ST7 and the data generation step ST9 are collectively referred to as a compensation calculation step ST8.

As described above, according to the sixth embodiment, the central processing unit 18 controls ON / OFF of the switching transistor 8 based on the change characteristics of a plurality of input data related to the same input. Since the control basic data is calculated and the input data memory for storing the control amount is provided, the same effect as in the fifth embodiment can be obtained without the detection coil 12. Moreover,
The required number of parts can be reduced as compared with the related art, and the device can be downsized.

In the sixth embodiment, the detection coil 1
Although the example in which 2 is reduced has been described, similar basic control data can be obtained even if other members such as resistance are reduced.

Embodiment 7 FIG. 16 is a block diagram showing a configuration of a DC power supply device and its peripheral devices according to Embodiment 7 of the present invention. In FIG. 10 of the fourth embodiment, a load status information signal is output from the load microcomputer 4 to the power supply microcomputer 16, and an alarm signal is output from the power supply microcomputer 16 to the load microcomputer 4. The other configuration is the same as that of the fifth embodiment, and thus the same reference numerals are given and the description is omitted.

Next, the operation will be described. FIG. 17 is a flowchart showing a control amount calculation interrupt sequence in the central processing unit according to Embodiment 7 of the present invention. In the figure, ST10 is a load information reading step for reading the load status information, ST11 is an overcurrent determination step for determining whether or not the load status information includes overcurrent information, and ST12 is an overcurrent information step. Is included in the control amount calculation step ST2.
ST13 is a torque determination step for determining whether the load status information includes torque increase instruction information, and ST14 includes the torque increase instruction information. If so, this is an increasing step for increasing the switching control amount obtained in the control amount calculating step ST2. The other operations are the same as those in the fifth embodiment, and thus the same reference numerals are given and the description is omitted.

Therefore, when an overcurrent is generated, it is immediately resolved by suppressing the power supply in the DC power supply device, and the shortage of torque that cannot be absorbed by the load circuits 2, 3, and 4 occurs. Even if there is, the direct current can be supplied to the motor 3 directly from the DC power supply device, so that the shortage of torque can be solved. As a result, it is possible to obtain a torque control and an overcurrent prevention effect that could not be achieved conventionally.

Further, when an abnormal current flows in the DC power supply, the load is stopped by the alarm signal to prevent the power supply from being destroyed.

As described above, according to the seventh embodiment, the load circuit 2,
The load status information on the switching transistors 8 and 3 is input and the switching transistor 8 is
, The continuous switching data for ON / OFF control is changed, so that the current can be supplied directly to the load without passing through the capacitor 6 according to the load status information. As a result, the voltage of the capacitor 6 can be more highly stabilized as compared with the case where the DC power supply device and the load circuits 2, 3, and 4 are separately controlled, and the load circuits 2, 3, and 4 can be further stabilized. Even if there is a request for supplying a current equal to or greater than a predetermined value from Step 4 or an overcurrent flows, the ON / OFF control of the switching transistor can be adjusted accordingly. This has the effect of improving the stability, capability, and safety of the power supply system when viewed from various loads.

Embodiment 8 FIG. FIG. 18 is a block diagram showing a configuration of a DC power supply device and peripheral devices according to Embodiment 8 of the present invention. In the figure, 28 is connected to various detection members and the power module 2, and the power supply microcomputer 16 and the load microcomputer 4 are connected.
And a shared microcomputer (control means) realizing both functions. Note that the load status information and the alarm information are temporarily stored in the RAM 22, and are configured to be confirmed when the main program is executed.
The other configuration is the same as that of the seventh embodiment, and the same reference numerals are given and the description is omitted.

As described above, according to the eighth embodiment, all the operations required in the central processing unit 18 for controlling the power supply unit are interrupt processing.
In particular, since the control amount calculation interrupt sequence is configured to be operated at regular time intervals or more, even if the central processing unit for power control and the central processing unit for load control are shared, the seventh embodiment differs from the seventh embodiment. The same operation can be performed, and the same effect as in the seventh embodiment can be obtained.

Embodiment 9 FIG. 19 is a flowchart showing a power-on sequence executed immediately after power-on in the central processing unit according to Embodiment 9 of the present invention. In the figure, ST15 is a charging potential determination step for determining whether or not the capacitor 6 has been charged to a predetermined charging potential or higher, and ST16 is a step that is continuously executed while the charging potential is insufficient. In addition, ST17 is a closing selection step for selecting continuous switching data in which the current is limited, and ST17 is a step executed when the charging potential becomes equal to or higher than a predetermined potential in the charging potential determination step. This is a completion step for outputting a charge completion signal to the circuits 2, 3, and 4.
The other operations and configurations are the same as those of the seventh embodiment, and thus description thereof will be omitted.

As described above, according to the ninth embodiment, immediately after the power is turned on, the switching transistor 8 is turned on / off so as to suppress the current flowing into the capacitor 6.
Since the continuous switching data for the FF control is changed, it is possible to suppress an excessive current from flowing during the period from when the power is turned on to when the capacitor 6 is charged to a predetermined level. Therefore, the rating of the switching transistor 8 and other circuit elements of the power supply device can be expected to be as low as a level corresponding to the current and voltage in a steady state, and the size is much smaller than that of the conventional power supply device. There is an effect that can be.

[0071]

As described above, according to the present invention, the control means for controlling the ON / OFF of the switching transistor includes the switching data storing the continuous switching data for continuously switching the switching transistor a plurality of times. A memory, and a central processing unit that calculates a switching control amount of the switching transistor once each time during the continuous switching period in which the switching is performed a plurality of times, based on the continuous switching data according to the switching control amount. Since the ON / OFF of the switching transistor is controlled, the processing load per unit time of the central processing unit is reduced, and the ON / OFF of the switching transistor is performed without using the latest microcomputer in the current technology.
FF control can be performed. Therefore, the power factor improving effect and the harmonic current can be suppressed with low current consumption and low cost, which could not be obtained by using an active smoothing filter IC or a microcomputer that performs the same operation instead. There is an effect that can be done.

According to the present invention, the switching data memory stores a plurality of continuous switching data for each divided period obtained by dividing one cycle of the AC voltage output from the AC power supply into a plurality of periods, and the central processing unit includes Since one continuous switching data is selected in accordance with the switching control amount and ON / OFF of the switching transistor is controlled by the continuous switching data, the processing load per unit time of the central processing unit is further reduced.

According to the present invention, the switching data memory stores one continuous switching data for each divided period obtained by dividing one cycle of the AC voltage output from the AC power supply into a plurality of periods, and the central processing unit performs the switching operation. O in the continuous switching data according to the control amount
N / OFF is corrected, and the ON / O of the switching transistor is determined by the corrected continuous switching data.
Since the FF is controlled, there is an effect that the processing load per unit time of the central processing unit is reduced while suppressing an increase in cost due to the memory.

According to the present invention, the control means has the direct memory access controller for sequentially outputting the switching data relating to the predetermined continuous switching data from the switching data memory, and the output of the continuous switching data by the direct memory access controller. ON / OFF of the switching transistor according to
Since the OFF is controlled, it is not necessary for the central processing unit to directly call the data in the memory and write the data into another register or the like, so that the processing load on the central processing unit per unit time is further reduced.

According to the present invention, since the control means has the phase control circuit for synchronizing the ON / OFF switching timing of the switching transistor with the AC power supply, the control error based on the phase difference can be reduced.
In addition, there is an effect that it is possible to prevent an excessive current from flowing to a switching transistor or the like due to this error.

According to the present invention, since the central processing unit has the input data memory for storing the compensation operation result while the central processing unit performs the compensation operation on the input data, the control means temporarily controls the DC power supply device after manufacturing the DC power supply device. It is possible to obtain a predetermined control ability only by adjusting parameters and the like used for the compensation calculation, and it is possible to perform the adjustment without replacing the detection member and the like.

According to the present invention, the control means calculates the control basic data for the central processing unit to perform ON / OFF control of the switching transistor based on the change characteristics of a plurality of input data relating to the same input. Since the input data memory for storing the control amount is provided, there is no need to provide a detection member for each control basic data necessary for the control, and the number of components can be reduced.

According to the present invention, the control means receives the load status information relating to the load circuit and turns on the switching transistor based on the load status information.
Since the continuous switching data for the / OFF control is changed, it is possible to directly supply a current to the load according to the load status information without using a capacitor. As a result, the voltage of the capacitor can be stabilized as compared with a case where the DC power supply device and the load circuit are separately controlled, and a current supply of a predetermined value or more is required from the load circuit, Even if a current flows, the ON / OFF control of the switching transistor can be adjusted accordingly, so that the stability and performance of the power supply system as seen from the final load such as a motor is considered. There is an effect that safety can be improved.

According to this invention, the control means changes the continuous switching data for ON / OFF control of the switching transistor so as to suppress the current flowing into the capacitor immediately after the power supply of the load circuit is turned on. It is possible to suppress an excessive current from flowing during the period from the time of being turned on until the capacitor is charged to a predetermined level. Therefore, the rating of switching transistors and other circuit elements of the power supply can be expected to be as low as the level corresponding to the steady-state current and voltage, and the size of the power supply can be made much smaller than conventional power supplies. There is an effect that can be.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a DC power supply device and peripheral devices according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing an internal circuit configuration of the power supply microcomputer according to the first embodiment of the present invention;

FIG. 3 is a flowchart showing a control amount calculation interrupt sequence in the central processing unit according to Embodiment 1 of the present invention;

FIG. 4 is a flowchart showing a switching control interrupt sequence in the central processing unit according to Embodiment 1 of the present invention;

FIG. 5 is an example of a timing chart obtained by a series of operations in the DC power supply device according to Embodiment 1 of the present invention.

FIG. 6 is a block diagram showing an internal circuit configuration of a power supply microcomputer according to a second embodiment of the present invention.

FIG. 7 is a flowchart showing a control amount calculation interrupt sequence in the central processing unit according to Embodiment 2 of the present invention;

FIG. 8 is a block diagram showing an internal circuit configuration of a power supply microcomputer according to Embodiment 3 of the present invention.

FIG. 9 is a flowchart showing a control amount calculation interrupt sequence in the central processing unit according to Embodiment 3 of the present invention;

FIG. 10 is a block diagram showing a configuration of a DC power supply device and peripheral devices according to a fourth embodiment of the present invention.

FIG. 11 is a block diagram showing an internal circuit configuration of a power supply microcomputer according to a fourth embodiment of the present invention.

FIG. 12 is a block diagram showing an internal circuit configuration of a power supply microcomputer according to a fifth embodiment of the present invention.

FIG. 13 is a flowchart showing a control amount calculation interrupt sequence in the central processing unit according to Embodiment 5 of the present invention;

FIG. 14 is a block diagram showing a configuration of a DC power supply device and peripheral devices according to a sixth embodiment of the present invention.

FIG. 15 is a flowchart showing a control amount calculation interrupt sequence in a central processing unit according to Embodiment 6 of the present invention;

FIG. 16 is a block diagram showing a configuration of a DC power supply device and peripheral devices according to a seventh embodiment of the present invention.

FIG. 17 is a flowchart showing a control amount calculation interrupt sequence in the central processing unit according to Embodiment 7 of the present invention;

FIG. 18 is a block diagram showing a configuration of a DC power supply device and peripheral devices according to an eighth embodiment of the present invention.

FIG. 19 is a flowchart showing a power-on sequence executed immediately after power-on in the central processing unit according to Embodiment 9 of the present invention.

FIG. 20 is a block diagram showing a configuration of a conventional DC power supply device and its peripheral devices.

21 is a diagram showing a relationship between an AC voltage and an AC current in the DC power supply device shown in FIG.

FIG. 22 is a block diagram showing a configuration of another conventional DC power supply device and its peripheral devices.

23 is a diagram showing a relationship between an AC voltage and an AC current in the DC power supply device shown in FIG.

24 is a diagram illustrating a relationship between an AC voltage and an AC current when a microcomputer is used instead of the active smoothing filter IC in the DC power supply device of FIG. 22;

[Explanation of symbols]

1 AC power supply, 2 power module (load circuit), 3
Motor (load circuit), 4 load microcomputer (load circuit), 5 rectifier bridge circuit, 6 capacitor, 7 diode, 8 switching transistor,
9 coils, 16 power supply microcomputer (control means), 18 central processing unit, 21 ROM (switching data memory), 22 RAM (switching data memory, input data memory), 24 direct memory access controller, 28 shared microcomputer (control Means), 30 phase control circuit.

Claims (9)

[Claims] 1. A rectifier bridge circuit disposed in series between an AC power supply and a load circuit, a capacitor disposed in parallel between the rectifier bridge circuit and the load circuit, and the rectifier bridge circuit. A coil disposed in series between the capacitor and the capacitor; a switching transistor disposed in parallel between the coil and the capacitor; and a switching transistor disposed between the switching transistor and the capacitor. In a DC power supply device having a diode arranged to flow a current only to the load circuit side and control means for controlling ON / OFF of the switching transistor, the control means continuously connects the switching transistor. A switching data memory for storing continuous switching data for switching a plurality of times; A central processing unit that calculates a switching control amount of the switching transistor once each time in the continuous switching period in which the switching is performed a plurality of times, and based on continuous switching data corresponding to the switching control amount, A DC power supply device that controls ON / OFF. 2. The switching data memory stores a plurality of continuous switching data for each divided period obtained by dividing one cycle of the AC voltage output from the AC power supply into a plurality of periods, and the central processing unit stores the switching control amount in the switching control amount. 2. The DC power supply device according to claim 1, wherein one continuous switching data is selected in response thereto, and ON / OFF of the switching transistor is controlled by the continuous switching data. 3. The switching data memory stores one continuous switching data for each divided period obtained by dividing one cycle of the AC voltage output from the AC power supply into a plurality of periods, and the central processing unit responds to the switching control amount. 2. The DC power supply device according to claim 1, wherein ON / OFF of the continuous switching data is corrected by using the corrected continuous switching data, and ON / OFF of the switching transistor is controlled by the corrected continuous switching data. 4. The control means has a direct memory access controller for sequentially outputting switching data relating to predetermined continuous switching data from a switching data memory, and performs switching in response to continuous output of switching data by the direct memory access controller. The DC power supply according to any one of claims 1 to 3, wherein ON / OFF of the transistor is controlled. 5. The DC power supply according to claim 1, wherein the control means has a phase control circuit for synchronizing ON / OFF switching timing of the switching transistor with an AC power supply. Power supply. 6. The control unit according to claim 1, wherein the central processing unit performs a compensation operation on the input data and has an input data memory for storing the compensation operation result. A DC power supply according to any one of the preceding claims. 7. The control means calculates control basic data for ON / OFF control of the switching transistor based on a change characteristic of a plurality of input data relating to the same input by the central processing unit, and controls the control amount. 7. The DC power supply device according to claim 1, further comprising an input data memory for storing the data. 8. The control means according to claim 1, wherein load status information relating to the load circuit is input, and continuous switching data for ON / OFF control of the switching transistor is changed based on the load status information. The DC power supply according to any one of claims 1 to 7. 9. The control circuit according to claim 6, wherein immediately after the power supply of the load circuit is turned on, continuous switching data for ON / OFF control of the switching transistor is changed so as to suppress a current flowing into the capacitor. The DC power supply device according to any one of claims 1 to 8.