JPH09285184A - Motor controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the operation possible without latch-up even though a microcomputer is directly coupled to a high withstand voltage monolithic IC by supplying an output voltage of a stabilizing power source to the inside of a high withstand voltage monolithic IC and also to a power supply terminal of the microcomputer. SOLUTION: A stabilizing power source 60 stabilizes the output voltage of a DC power source 105 and supplies power to a power supply terminal 102 of the microcomputer 90 through a power source voltage output terminal 610 of a high withstand voltage monolithic IC 150 and also supplies to an interface section 70. As stated above, the interface section 70 and a power supply voltage of the microcomputer 90 are made common, normal operation can be obtained even though the input and output terminals of the microcomputer 90 and the high withstand voltage monolithic IC 150 are directly connected each other, and the microcomputer 90 can without latch-up. Thus, a compact unit having a simple configuration can be created.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor control device used in home electric appliances such as air conditioners and water heaters.

[0002]

2. Description of the Related Art In recent years, the technology for embodying a motor control device, especially the semiconductor technology, has been remarkably improved, and a DC main power source (DC 140V or DC 280V or so) rectified and smoothed from a commercial power source voltage. It is now possible to realize a high withstand voltage monolithic IC capable of PWM control of the drive winding terminal of the motor by directly applying (.

Here, the PWM control is Pulse Wi
Abbreviation of dth Modulation, which controls the average voltage applied to the drive winding terminal of the motor by the ratio of the time of connecting the drive winding terminal of the motor to the positive side of the DC main power supply and the time of connecting it to the negative side. Is something
This is a widely used control method.

Generally, the power supply of household electric appliances is obtained by rectifying and smoothing a commercial power supply voltage, and by using the above-mentioned high withstand voltage monolithic IC, a control device for a motor used in the appliances is relatively operated. It is becoming easier to realize.

[0005]

However, when an attempt is made to realize a motor control device by combining the above-mentioned high breakdown voltage monolithic IC with a microcomputer, the power supply voltage of each signal processing circuit inside the high breakdown voltage monolithic IC and the microcomputer. Because the power supply voltage of
It is not possible to directly connect each input / output terminal of the microcomputer to each input / output terminal of the high breakdown voltage monolithic IC.

That is, the voltage values corresponding to the "L" level and "H" level, which are the input / output levels of the microcomputer, and the "L" level and the "H" level, which are the input / output levels of the high breakdown voltage monolithic IC, are set. There is a possibility that the voltage may be matched with the corresponding voltage value, that they may not operate normally even if they are directly connected, or the microcomputer may become latched up and become inoperable, and in some cases may be destroyed.

Generally, the microcomputer cannot operate unless the voltage value of each input / output terminal is within the range of the plus side power source voltage and the minus side power source voltage, and may be destroyed in some cases. This phenomenon is usually called latchup.

In order to avoid these problems, it is possible to provide a relay circuit separately, but not only the configuration becomes complicated, but also when the power is turned on, the power is shut off, or a power failure occurs such as a power failure or an instantaneous power failure. Is a voltage value corresponding to the “L” level and the “H” level which are transiently the input / output level of the microcomputer, and the “L” level and the “H” level which are the input / output levels of the high breakdown voltage monolithic IC.
There is a risk that the voltage value corresponding to the level will not match,
After all, the fear that the microcomputer will be latched up and rendered inoperable and possibly destroyed will be unavoidable.

When the DC main power source (DC140V or DC280V voltage value) obtained by rectifying and smoothing the commercial power source is PWM-controlled, the drive winding terminal of the motor is connected to the positive side or the negative side of the DC main power source. The power supply of the above-mentioned microcomputer and the like tends to become unstable due to switching noise when performing the operation.

In this case, the above-mentioned problems are more likely to occur and become serious. Further, in the above-mentioned high breakdown voltage monolithic IC, the protection circuit section for overcurrent protection, overheat protection, etc. is not sufficiently enhanced, and for the above reason, each input / output terminal of these protection circuit sections and the microcomputer Cannot directly connect to each input / output terminal.

Further, since the microcomputer does not operate normally when its power supply voltage becomes excessive or insufficient, it monitors the microcomputer for an abnormality in the power supply voltage excess and deficiency, and when it is abnormal, the microcomputer is reset. Overvoltage protection and undervoltage protection are required. In particular, undervoltage protection is indispensable because the microcomputer is booted from the reset state at the rise of the power supply voltage (so-called power ON reset).

Since there is generally no protection circuit section for such overvoltage protection or undervoltage protection inside the above-mentioned high breakdown voltage monolithic IC, a motor of a combination of a high breakdown voltage monolithic IC and a microcomputer is used. It is difficult to realize the control device.

The conventional motor control device has the above problems. The present invention solves the above-mentioned conventional problems. By incorporating an interface section having a common power supply voltage with a microcomputer into a high breakdown voltage monolithic IC, each input / output terminal of the microcomputer and the high breakdown voltage monolithic IC are integrated. It is an object of the present invention to provide a motor control device that operates normally even if it is directly connected to each input / output terminal, and that does not latch up the microcomputer.

Further, a protection circuit section for overcurrent protection, overheat protection, overvoltage protection, undervoltage protection, etc. is built in a high breakdown voltage monolithic IC, and each input / output signal of these protection circuit sections is passed through the interface circuit section. It is an object of the present invention to provide a safer, compact and low-cost motor control device that can be directly connected to each input / output terminal of a microcomputer.

[0015]

In order to solve this problem, a motor control device of the present invention uses a motor having a plurality of drive windings and an output voltage of a DC main power supply obtained by rectifying and smoothing a commercial power supply. A power transistor having a withstand voltage is provided, and at least the number of phases of the drive winding of the motor is provided.
A power transistor group for connecting the drive winding of the motor to the positive side or the negative side of the DC main power source by switching, and switching drive of each of the power transistors forming the power transistor group based on a switching command signal. Pre-drive section
A protection circuit unit that shuts off all conduction of the power transistor at the time of abnormality, an interface unit that inputs and outputs a signal related to the operation of the protection circuit unit, and a DC power supply,
A stabilizing power supply that stabilizes the output voltage of the DC power supply, and a microcomputer that outputs the switching command signal to the predrive unit are provided, and the power transistor group, the predrive unit, the protection circuit unit, and the interface. Part and the stabilized power source are monolithic I
The monolithic IC includes a power supply terminal to which the output voltage of the DC power supply is supplied, a power supply voltage output terminal to which the output voltage of the stabilized power supply is output, and a signal related to the operation of the protection circuit unit. It has an input terminal and an output terminal that are input and output through the interface section, and the microcomputer controls or detects the operation of the protection circuit section in the input terminal and the output terminal of the monolithic IC. Is connected to an output terminal and an input terminal of the microcomputer, and the output voltage of the stabilized power supply is supplied to the interface section inside the monolithic IC and the microcomputer is supplied via the power supply voltage output terminal. It is configured to be supplied to the power supply terminal of.

As described above, by sharing the power supply voltage of the interface portion, which is a signal processing circuit inside the high breakdown voltage monolithic IC, with the power supply voltage of the microcomputer, each input / output terminal of the microcomputer and the high breakdown voltage monolithic. Even if the input / output terminals of the IC are directly connected, the IC operates normally, and the microcomputer can operate without latching up. A motor control device that can be miniaturized with an extremely simple structure can be realized at low cost. You can

Further, a protection circuit section for overcurrent protection, overheat protection, overvoltage protection, undervoltage protection, etc. is built in a high breakdown voltage monolithic IC, and signals related to the operation of these protection circuit sections are supplied via the interface section to a micro. By being transmitted to each input / output terminal of the computer, a safer motor control device can be realized with a simple configuration in a small size and at a low cost.

Further, depending on the control algorithm incorporated in the microcomputer, a high-performance motor control device can be realized while maintaining a simple structure.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a motor controller according to the present invention. In FIG. 1, reference numeral 1 denotes a commercial power source, which is generally AC100V or AC200V. A rectifying diode bridge 2 rectifies the voltage of the commercial power source 1. A smoothing capacitor 3 smoothes the voltage of the commercial power supply 1 rectified by the rectifying diode bridge 2. Therefore, a DC voltage of about DC140V or DC280V is generated between the terminals of the smoothing capacitor 3 as the output voltage of the DC main power supply.

Reference numeral 90 is a microcomputer, and 15
0 is a high voltage monolithic IC.

The high breakdown voltage monolithic IC 150 is
A power transistor group 10 composed of high withstand voltage power transistors 11 to 16 capable of withstanding the DC main power source and freewheeling diodes 17 to 22 connected in parallel in opposite directions is incorporated.

Here, the power transistors 11 to 1
Reference numeral 6 is composed of an IGBT.

Incidentally, the power transistors 11 to 16
Need not be composed of an IGBT, and may be, for example, a bipolar transistor, a power MOS-FET, an IEGT, or the like, but in the present embodiment, the case of an IGBT is described as an example.

The power transistors 11 to 13 have a common collector, and the high breakdown voltage monolithic IC.
It is connected to the DC main power input terminal 7 of 150.

The power transistors 14 to 16 are IGBTs having a multi-emitter structure, the first emitters thereof are common, and the high breakdown voltage monolithic IC 150 is used.
Is connected to the DC main power input terminal 8.

The DC main power source is input between the DC main power source input terminals 7 and 8, and the DC main power source input terminal 8 is grounded.

The emitter of the power transistor 11 and the collector of the power transistor 14, the emitter of the power transistor 12 and the collector of the power transistor 15, the emitter of the power transistor 13 and the collector of the power transistor 16 respectively have the high withstand voltage. It is connected to the drive windings 4, 5, 6 of the motor through the motor drive winding connection terminals 23, 24, 25 of the monolithic IC 150.

Reference numeral 30 is a pre-drive unit, which is an oscillation circuit 3
1, a charge pump circuit 33, diodes 35 and 36, an upper arm drive circuit 41, and a lower arm drive circuit 42.

The oscillating circuit 31 is configured to input the oscillating frequency signal 39 determined by the capacitor 32 to the charge pump circuit 33.

According to the oscillation frequency signal 39, the charge pump circuit 33 has a first output terminal to which one end of the capacitor 37 is connected, with 0 V and a DC main power supply voltage (1
40V or 280V) is repeatedly generated.

Therefore, in the condenser 37,
When the first output terminal of the charge pump circuit 33 is 0V, it is charged by the DC voltage 34 through the diode 35, and the voltage between the terminals is almost equal to the DC voltage 34.

From this state, the charge pump circuit 33
When the first output terminal of the capacitor becomes the DC main power supply voltage, the electric charge charged in the capacitor 37 becomes
Will be discharged through the capacitor and the capacitor 38 will be charged. At this time, the voltage between the terminals of the capacitor 38 is substantially equal to the voltage between the terminals of the capacitor 37, and substantially equal to the DC voltage 34.

This voltage is output from the second output terminal of the charge pump circuit 33 as the drive power supply voltage 40 of the upper arm drive circuit 41, and the upper arm drive circuit 41 is supplied.
Is a value at which sufficient voltage can be applied to the gates of the power transistors 11 to 13 to sufficiently control the power transistors 11 to 13 to be turned on and off.

The lower arm drive circuit 42 is constructed so as to control the gate voltages of the power transistors 14 to 16 so that the transistors 11 to 13 can be sufficiently turned on and off.

Reference numeral 50 denotes a protection circuit section, which is an overcurrent protection circuit 51, an RS flip-flop circuit 52, and an overheat protection circuit 5.
5, an RS flip-flop circuit 56, a DC power supply monitoring circuit 57, a logic inverting means 58, and a logical sum inverting means 59.

In the overcurrent protection circuit 51, the second emitters of the power transistors 14 to 16 are connected, and the currents flowing in the respective second emitters are combined to flow in the power transistors 11 to 16. The current detection signal corresponding to the current is detected as the voltage between the terminals of the resistor 53.

Further, the current flowing through the power transistors 11 to 16 detected as the voltage between the terminals of the resistor 53 becomes an overcurrent, and the power transistors 11 to 16 are generated.
If there is a risk of damaging the motor or burning the drive windings 4 to 6 of the motor, the overcurrent protection circuit 51 causes the R
It is configured to set the S flip-flop 52.

The capacitor 54 connected in parallel with the resistor 53 is a noise removing capacitor,
The current detection signal becomes unstable due to switching noise generated when the power transistors 11 to 16 perform the ON / OFF switching operation, and the overcurrent protection circuit 51 is prevented from malfunctioning.

The overheat protection circuit 55 is configured to set the RS flip-flop circuit 56 when the driving transistors 11 to 16 generate heat and may be destroyed.

The DC power supply monitoring circuit 57 is a DC power supply 1
05 or at least one of the output voltages of the stabilized power supply 60 is excessive or insufficient, and the operation of the control device may become unstable, the output is set to the “L” level.

The output of the DC power supply monitor circuit 57 is configured to maintain the "L" level for a time determined by the capacitor 107 even when the output voltage of the DC power supply 105 or the stabilized power supply 60 is restored. Has been done.

The logic inverting means 58 is configured to invert the output signal of the DC power supply monitoring circuit 57 and input it to the reset terminal of the RS flip-flop circuit 56.

The logical sum negation means 59 is configured to output the logical sum negation of the output signals of the RS flip-flop circuits 52 and 56 and the output signal of the logical inversion means 58.

Reference numeral 60 denotes a stabilizing power source, and a DC power source 105 to which a noise removing capacitor 106 is connected in parallel is input to the stabilizing power source 60 via a power source terminal 62 of the high breakdown voltage monolithic IC 150.

The stabilizing power supply 60 is the DC power supply 105.
Of the power supply voltage output terminal 61 of the high withstand voltage monolithic IC 150.
Via the power source terminal 10 of the microcomputer 90
2 is also supplied to the interface unit 70.

Further, the output voltage of the DC power supply 105 and the stabilized output voltage of the stabilizing power supply 60 are also input to the DC power supply monitoring circuit 57 to monitor whether the voltage value is excessive or insufficient.

Reference numeral 70 denotes an interface unit, which is an open-collector or open-drain output type logical sum inverting means 71, a logic inverting means 72, an open collector or open drain output-type logic non-inverting means 73, and resistors 74 to 77. It is composed by.

The logical sum negation means 71 performs logical sum negation of the outputs of the RS flip-flop circuits 52 and 56 and outputs the result. The output of the OR gate 71 is connected to the other end of the pull-up resistor 74 whose one end is supplied with the stabilized output voltage of the stabilizing power supply 60, and the output terminal 7 of the high breakdown voltage monolithic IC 150.
Input terminal 9 of the microcomputer 90 via 8
8 is input.

The input of the logic inverting means 72 is connected to the output terminal 99 of the microcomputer 90 via the input terminal 79 of the high breakdown voltage monolithic IC, and the stabilized output voltage of the stabilizing power supply 60 is supplied. It is connected to the other end of the pull-up resistor 74 supplied to one end.

The output of the logic inverting means 72 is the RS
It is input to the reset terminal of the flip-flop circuit 52.

The logic non-inversion means 73 outputs the output of the DC power supply monitor circuit 57 without logically inverting it, and the output is the pull-up resistor 77 to which the stabilized output voltage of the stabilized power supply 60 is supplied. Is connected to the other end of
The input terminal 101 of the microcomputer 90 is output through the output terminal 81 of the high voltage monolithic IC 150.
Is input to

The stabilized output voltage of the stabilized power supply 60 is supplied to one end of the pull-up resistor 76.
The other end of the pull-up resistor 76 is connected to the output terminal 100 of the microcomputer 90 via the input terminal 80 of the high withstand voltage monolithic IC 150, and is also input to the input terminal of the logical sum inverting means 59. .

The pull-up resistors 74 to 77 are
It does not necessarily have to be a resistor, and may be, for example, a constant current source.

In the present embodiment, the case where it is a resistor is shown as an example.

Reference numerals 114 to 119 and 120 to 125 are a logic non-inversion means and a logical product means, respectively, and together with the predrive section 30, the protection circuit section 50, the stabilizing power source 60 and the interface section 70, the power transistor. Similar to the group 10, the high breakdown voltage monolithic IC
Built in 150.

The inputs of the logic non-inverting means 114 to 119 are connected to the output terminals 92 to 97 of the microcomputer 90 via the input terminals 108 to 113 of the high breakdown voltage monolithic IC 150, respectively.

The outputs of the logical non-inverting means 114 to 119 are logically summed with the output of the logical sum inverting means 59 by the logical product means 120 to 125, respectively, and the outputs of the logical product means 120 to 125 are obtained. , To the upper arm drive circuit 41 and the lower arm drive circuit 42, respectively.

Reference numeral 91 is a crystal oscillator for generating a reference clock signal for operating the microcomputer 90.

The capacitor 104 is connected between the power supply terminal 102 and the ground terminal 103 of the microcomputer 90 and functions to remove power supply noise.

The operation of the motor control device configured as described above will be described. First, the case where the output of the logical sum denial means 59 is at the'H 'level will be described.

Each output terminal 9 of the microcomputer 90
2 to 97 output switching command signals for driving the power transistors 11 to 16.

For example, when the switching command signal from the output terminal 92 is at the'L 'level, this signal is input to the input terminal 108 of the monolithic IC 150 and the logic non-inversion means 11.
4 and the logical product means 120 are input to the upper arm drive circuit 41 as a signal of'L 'level.

When the signal of'L 'level is input to the upper arm drive circuit 41 by the logical product means 120, the upper arm drive circuit 41 sets the gate voltage of the power transistor 11 to'L' level and turns off the power transistor 11. To work.

When the switching command signal from the output terminal 92 is at the "H" level, the operation reverse to the above is performed, and the upper arm drive circuit 41 sets the gate voltage of the power transistor 11 to the "H" level and the power is turned on. Transistor 1
It operates so that 1 is turned on.

The same operation is performed for the switching command signals from the output terminals 93 to 97, and the power transistors 12 to 12 are selected depending on whether each switching command signal is at the'L 'level or the'H' level. It is controlled whether 16 is OFF or ON.

Therefore, each of the power transistors 11 to 16 is turned on / off by each switching command signal from the output terminals 92 to 97 of the microcomputer 90.
It is possible to control and connect each terminal of the drive windings 4 to 6 of the motor to the DC main power source input terminal 7 to which the positive side voltage of the DC main power source is supplied, or the DC main side to which the negative side voltage is supplied. It can be controlled whether to connect to the power input terminal 8.

Therefore, so-called PWM control can be realized in which the average applied voltage to each terminal of the drive windings 4 to 6 of the motor is controlled by adjusting the ratio of the time of connecting to the voltage on each side.

Next, the output of the logical sum denial means 59 is'L '.
In the case of the level, all the outputs of the logical product means 120 to 125 become the “L” level regardless of the above-mentioned switching command signal.

At this time, the outputs of the upper arm drive circuit 41 and the lower arm drive circuit 42 are all at the “L” level, all the power transistors 11 to 16 are turned off, and their conduction is cut off.

This state is generally called a free-run state, and when some trouble occurs and each protection circuit described below operates, the drive windings 4 to 6 of the motor are released from the DC main power supply, and the motor and It protects the control device.

The operation of the protection circuit section 50 will be described below. The overcurrent protection circuit 51 includes each power transistor 1
When an excessive current flows through 1 to 16 and there is a risk of destruction, the set input terminal of the RS flip-flop circuit 52 is set to the “H” level. As a result, the RS flip-flop circuit 52 is set and its output is latched at the'H 'level.

When the output of the RS flip-flop circuit 52 becomes the "H" level, the output of the logical sum inverting means 59 becomes the "L" level, and as described above, the conduction of each of the power transistors 11 to 16 is cut off, and the free run is performed. It becomes a state.

At this time, at the same time, the output of the OR disabling means 71 also becomes'L 'level, and operates to inform the microcomputer 90 via the output terminal 99 and the input terminal 98 that it is in the free-run state due to the overcurrent abnormality. To do.

On the other hand, the output terminal 99 of the microcomputer 90 is connected to the reset input terminal of the RS flip-flop circuit 52 via the input terminal 79 and the logic inverting means 72, and the output terminal 99 of the microcomputer 90.
By setting the output signal of "L" level, the RS flip-flop circuit 52 is reset and its output is "L".
By setting the level, it is possible to cancel the free run state due to the overcurrent abnormality.

The overheat protection circuit 55 is provided when the power transistors 11 to 16 are overheated and may be destroyed.
The set input terminal of the RS flip-flop circuit 56 is set to the “H” level. As a result, the RS flip-flop circuit 56 is set and its output is latched at the'H 'level.

When the output of the RS flip-flop circuit 56 becomes the "H" level, the output of the logical sum inverting means 59 becomes the "L" level, and as described above, the conduction of each of the power transistors 11 to 16 is cut off and the free run is performed. It becomes a state.

At this time, at the same time, the output of the logical sum denial means 71 also becomes'L 'level, and it operates so as to notify the microcomputer 90 via the output terminal 99 and the input terminal 98 that it is in the free-run state due to the overheating abnormality. .

The DC power supply monitoring circuit 57 includes a DC power supply 105.
Output voltage of the power supply 60 or the stabilized output voltage of the stabilized power supply 60 becomes excessive or insufficient, the operation of each circuit inside the monolithic IC 150 and the operation of the microcomputer 90 may become unstable. 'It works like a level.

The output of the power supply monitoring circuit 57 maintains the “L” level for the time determined by the capacitor 107 even when the output voltage of the DC power supply 105 or the stabilized output voltage of the stabilizing power supply 60 is restored. To work.

This is true even when the output voltage of the DC power supply 105 or the stabilized output voltage of the stabilized power supply 60 is instantaneously lowered and instantly restored, such as an instantaneous power failure.
This operation is necessary to detect the abnormality and to reliably perform the protection operation described below.

When the output of the DC power supply monitoring circuit 57 becomes the "L" level, the output of the logic inverting means 58 becomes the "H" level, and the output of the logical sum inverting means 59 becomes the "L" level, which is in the free-run state.

At this time, at the same time, the output of the logic non-inversion means 73 becomes "L" level, which indicates that the DC power supply abnormality has occurred.
It operates so as to transmit it to the microcomputer 90 via the output terminal 81 and the input terminal 101.

Input terminal 10 of microcomputer 90
Reference numeral 1 is a normal reset input terminal. When this terminal goes to the'L 'level, the microcomputer 90 is immediately reset and the output terminals 92 to 97 are fixed at the'L' level.

When the output terminals 92 to 97 are fixed to the "L" level, even if the output voltage of the DC power supply 105 or the stabilized output voltage of the stabilized power supply 60 is restored,
Power transistors 11 to 16 are all cut off,
Operates to maintain a free run state.

Here, even after the output voltage of the DC power source 105 or the stabilized output voltage of the stabilized power source 60 is restored, the time for maintaining the output of the DC power source monitoring means 57 at the'L 'level is the microcomputer. 90 should be long enough to reset, and condenser 1
It is necessary for 07 to determine its capacitance value in consideration of this.

The output of the DC power supply monitoring circuit 57 is "L".
When the level becomes high and the output of the logic inverting means 58 becomes high, the RS flip-flop circuit 56 is reset and operates so as to release the free run state due to overheat protection.

Further, if the output terminal 100 of the microcomputer 90 is set to the “H” level, the logical sum inverting means 59.
Output can be set to the'L 'level, which also allows the free run state.

The above is the description of the protection circuit section 50. Next, the interface unit 70 will be described.

The OR disabling means 71 has an output form of open collector or open drain, and its output is output by the pull-up resistor 74 to the output voltage of the stabilized power supply 60 common to the power supply terminal 102 of the microcomputer 90. It has been pulled up.

Therefore, the output of the output terminal 78 of the monolithic IC 150, to which the output of the logical sum negation means 71 is connected, has an'H 'level substantially equal to the voltage value supplied to the power supply terminal 102 of the microcomputer 90, and "L" level is the ground terminal 1 of the microcomputer 90
It becomes almost equal to the voltage value of 03.

That is, the output signal from the output terminal 78 of the monolithic IC 150 input to the input terminal 98 of the microcomputer 90 is the microcomputer 90.
Within the voltage range of the power supply terminal 102 and the ground terminal 103, the microcomputer 90 does not malfunction or enter the latch-up state.

This can be said even when the DC power supply is turned on, a power failure or an instantaneous power failure occurs, and various other transient states.

The relationship between the output terminal 81 of the monolithic IC 150 and the input terminal 101 of the microcomputer 90, to which the output of the logic non-inversion means 73 of the open collector or open drain output type is connected, is also the same.
The microcomputer 90 does not malfunction or latch up due to the exchange of the input / output signals, including the transient state.

Output terminal 99 of microcomputer 90
And the input terminal 79 of the monolithic IC 150, the output terminal 100 of the microcomputer 90 and the monolithic IC 1
Similarly to the above, the relationship between the input terminals 80 of the 50 does not cause the microcomputer 90 to malfunction or latch up due to the exchange of the input / output signals, including the transient state.

The above is the description of the interface section 70. As described above, according to the present embodiment, the power supply voltage of the interface unit 70, which is a signal processing circuit inside the high withstand voltage monolithic IC 150, and the power supply voltage of the microcomputer 90 are made common, so that each of the microcomputers 90 is made. A motor that operates normally even if the input / output terminals are directly connected to the input / output terminals of the high-voltage resistant monolithic IC 150, and the microcomputer 90 can operate without latch-up, and can be miniaturized with an extremely simple configuration. The control device can be realized at low cost.

Further, a protection circuit section 50 for overcurrent protection, overheat protection, overvoltage protection, undervoltage protection, etc. is built in the high breakdown voltage monolithic IC 150 together with the power transistor group 10, and signals relating to the operation of these protection circuit sections 50 are provided. By transmitting to each input / output terminal of the microcomputer 90 via the interface section 70, a safer motor control device can be realized with a simple structure in a small size and at a low cost.

That is, when an abnormal situation such as overcurrent, overheat, overvoltage or undervoltage occurs, these protection circuit sections 50 are provided.
Is composed of a single chip monolithic IC 150 together with the high-voltage power transistor group 10, the operation delay time due to stray capacitance existing in the wiring is significantly reduced as compared with the case where a protection circuit is provided outside the IC. It is possible to cut off all of the power transistors 11 to 16 in a very instant state to bring them into the free-run state.

At the same time, the microcomputer 90
It is possible to accurately convey what kind of abnormal situation is occurring.

For example, when the overcurrent protection or the overheat protection is activated, the output terminal 78 becomes the “L” level, and this kind of abnormal situation can be detected by the input terminal 98. Then, the output terminal 99 sets the input terminal 79 to the “L” level and R
If the output terminal 78 can be set to the “H” level by resetting the S flip-flop circuit 52, it can be determined that the overcurrent protection is working, and if the output terminal 78 remains at the “L” level. It can be judged that the overheat protection is working.

When the overvoltage protection or the undervoltage protection operates, the output terminal 81 becomes the “L” level, and this kind of abnormal situation can be detected by the input terminal 101.

Therefore, the microcomputer 90 can discriminate the types of abnormal situations, can perform the optimum processing for each abnormal situation, and can realize a safer motor control device.

Further, depending on the control algorithm incorporated in the microcomputer 90, a high-performance motor control device can be realized while maintaining a simple structure.

(Second Embodiment) A second embodiment of the present invention will be described below.

FIG. 2 shows a second embodiment of the motor control device of the present invention. In FIG. 2, the part different from the embodiment shown in FIG. 1 is the monolithic IC 15
The internal stabilized power supply 60 is formed outside the monolithic IC 150, for example, by a three-terminal regulator, and the power supply voltage output terminal 61 is eliminated and the power supply voltage detection terminal 1 is used instead.
60 is provided, and the stabilized power supply voltage output of the stabilized power supply 60 provided outside the monolithic IC is supplied to the power supply terminal of the microcomputer 90, and also input to the power supply voltage detection terminal 160, via the terminal 160. The power supply voltage of the interface unit 70 and the power supply voltage of the microcomputer 90 are made common, and the DC power supply monitoring circuit 57 is also combined.
Allows the stabilized power supply 6 external to the monolithic IC 150.
The configuration is the same as that of FIG. 1 except that the output voltage of 0 is monitored.

The portions having the same functions as those in FIG. 1 are designated by the same symbols in FIG.

Even if the motor control device is configured as described above, it is clear that it is possible to obtain the same action and effect as the embodiment shown in FIG. 1, and detailed description thereof will be omitted. To do.

According to the present embodiment, the DC power source 1
05 is sufficiently stable, and the microcomputer 90
If a DC voltage value capable of operating the monolithic IC 150 is output, the stabilizing power supply 60 is omitted and the output voltage of the DC power supply 105 is set to the power supply terminal 102 of the microcomputer 90 and the power supply terminal 62 of the monolithic IC 150.
And the power supply voltage detection terminal 160.

In this case, the power supply terminal 62 and the power supply voltage detection terminal 160 of the monolithic IC 150 may be integrated into a single unit to serve as a power supply terminal and a power supply voltage detection terminal, which can reduce the number of terminals of the monolithic IC 150. The motor control device can be simply configured.

[0111]

As described above, according to the present invention, at least a motor having a plurality of phases of drive windings and a power transistor having a withstand voltage capable of withstanding an output voltage of a DC main power source obtained by rectifying and smoothing a commercial power source are provided in at least the motor. Based on a switching command signal, a group of power transistors that can be connected by switching the drive winding of the motor to the positive side or the negative side of the DC main power supply, which includes more than the number of phases of the drive winding.
A pre-drive unit for switching and driving each of the power transistors forming the power transistor group, a protection circuit unit for interrupting all conduction of the power transistors in the event of an abnormality, and an interface for inputting and outputting a signal related to the operation of the protection circuit unit. Unit, a DC power supply, a stabilizing power supply that stabilizes the output voltage of the DC power supply, and a microcomputer that outputs the switching command signal to the predrive unit, the power transistor group and the predrive unit The protection circuit unit, the interface unit, and the stabilized power supply are configured by a monolithic IC, and the monolithic IC outputs a power supply terminal to which an output voltage of the DC power supply is supplied and an output voltage of the stabilized power supply. Power supply voltage output terminal and operation of the protection circuit section A signal related to the input and output via the interface unit, and the input terminal and the output terminal of the monolithic IC, the microcomputer controls the operation of the protection circuit unit. Alternatively, it is connected to the output terminal and the input terminal of the microcomputer for detecting, and the output voltage of the stabilized power supply is supplied to the interface section inside the monolithic IC and via the power supply voltage output terminal. A motor having a constitution in which it is supplied to a power supply terminal of the microcomputer, or having a drive winding of a plurality of phases, and a power transistor having a withstand voltage capable of withstanding an output voltage of a DC main power supply obtained by rectifying and smoothing a commercial power supply. , At least more than the number of drive winding phases of the motor, The drive windings of the DC main power supply can be switched to the positive side or the negative side of the power transistor group to be connected, and based on the switching command signal, the power transistors constituting the power transistor group can be respectively driven to be switched. A drive unit, a protection circuit unit that shuts off all the conduction of the power transistor in the event of an abnormality, an interface unit that inputs and outputs a signal related to the operation of the protection circuit unit, a DC power supply, and stabilizes the output voltage of the DC power supply. A stabilized power source and a microcomputer that outputs the switching command signal to the pre-drive unit, and the power transistor group, the pre-drive unit, the protection circuit unit, and the interface unit are configured by a monolithic IC, The monolithic IC is
A power supply terminal to which the output voltage of the DC power supply is supplied, and a power supply voltage detection terminal for detecting the output voltage of the stabilized power supply,
The protection circuit section has an input terminal and an output terminal for inputting and outputting a signal via the interface section, and the input terminal and the output terminal of the monolithic IC are protected by the microcomputer. It is connected to the output terminal and the input terminal of the microcomputer for controlling or detecting the operation of the circuit unit, and the output voltage of the stabilized power supply is supplied to the power supply terminal of the microcomputer and the power supply voltage detection terminal. It is configured to be supplied to the interface unit inside the monolithic IC via the power supply voltage of the interface unit, which is a signal processing circuit inside the high-voltage monolithic IC, and the microcomputer. By sharing the power supply voltage with the microphone Even if each input / output terminal of the computer is directly connected to each input / output terminal of the high-voltage monolithic IC, it can operate normally, and the microcomputer can operate without latch-up, and can be miniaturized with an extremely simple configuration. It is possible to realize an inexpensive motor control device at low cost.

Further, a protection circuit section for overcurrent protection, overheat protection, overvoltage protection, undervoltage protection, etc. is built in a high withstand voltage monolithic IC, and signals related to the operation of these protection circuit sections are supplied via the interface section to the microcircuit. By transmitting to each input / output terminal of the computer, a safer motor control device can be realized in a compact and inexpensive manner with a simple configuration.

In other words, when an abnormal situation such as overcurrent, overheat, overvoltage or undervoltage occurs, these protection circuit sections are constructed as a one-chip monolithic IC together with a high voltage power transistor group. Compared with the case where an external protection circuit is provided, the operation delay time due to the stray capacitance existing in the wiring and the like is greatly reduced, and all of the power transistor groups can be turned off and put into a free-run state very instantly.

At the same time, it is possible to accurately inform the microcomputer of what kind of abnormal situation has occurred, and the microcomputer can discriminate the type of abnormal situation and perform optimum processing for each abnormal situation. It is possible to realize a safer motor control device.

Further, depending on the control algorithm incorporated in the microcomputer, a high-performance motor control device can be realized while maintaining a simple structure.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a motor control device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a motor control device according to a second embodiment of the present invention.

[Explanation of symbols]

 1 Commercial Power Supply 4, 5, 6 Motor Drive Winding 10 Power Transistor Group 11-16 Power Transistor 30 Pre-Drive Section 50 Protection Circuit Section 51 Overcurrent Protection Circuit 55 Overheat Protection Circuit 57 DC Power Supply Monitoring Circuit 60 Stabilized Power Supply 61 Power Supply Voltage output terminal 62 Monolithic IC power supply terminal 70 Interface section 78,81 Monolithic IC output terminal 79,80 Monolithic IC input terminal 90 Microcomputer 98,101 Microcomputer input terminal 99,100 Microcomputer output terminal 102 Microcomputer Power supply terminal 105 DC power supply 150 Monolithic IC 160 Power supply voltage detection terminal

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication H02M 7/48 9181-5H H02M 7/48 M // G06F 1/26 G06F 1/00 330A

Claims (5)

[Claims] 1. A motor having a plurality of phases of drive windings, and a power transistor having a withstand voltage capable of withstanding an output voltage of a DC main power source obtained by rectifying and smoothing a commercial power source, at least more than the number of phases of the drive windings of the motor. , A power transistor group for connecting the drive winding of the motor to the positive or negative side of the DC main power source by switching, and switching each of the power transistors constituting the power transistor group based on a switching command signal. A pre-drive unit to be driven, a protection circuit unit that shuts off all conduction of the power transistor in the event of an abnormality, an interface unit that inputs and outputs a signal related to the operation of the protection circuit unit, a DC power supply, and an output voltage of the DC power supply. Stabilized power supply for stabilizing the, and the switching command to the pre-drive unit And a microcomputer that outputs a signal, and the power transistor group, the pre-drive unit, the protection circuit unit, the interface unit, and the stabilized power supply are configured by a monolithic IC, and the monolithic IC is A power supply terminal to which an output voltage is supplied, a power supply voltage output terminal to which the output voltage of the stabilized power supply is output, an input terminal to which a signal related to the operation of the protection circuit unit is input and output via the interface unit, and An output terminal, and the input terminal and the output terminal of the monolithic IC are connected to the output terminal and the input terminal of the microcomputer for the microcomputer to control or detect the operation of the protection circuit unit. And the output voltage of the stabilized power supply is the monolithic IC The motor control apparatus which is configured to be supplied to the power supply terminal of the microcomputer through the power supply voltage output terminal is supplied to the interface unit inside. 2. A motor having a plurality of drive windings and a power transistor having a withstand voltage capable of withstanding an output voltage of a DC main power source obtained by rectifying and smoothing a commercial power source, at least more than the number of phases of the drive windings of the motor. , A power transistor group for connecting the drive winding of the motor to the positive or negative side of the DC main power source by switching, and switching each of the power transistors constituting the power transistor group based on a switching command signal. A pre-drive unit to be driven, a protection circuit unit that shuts off all conduction of the power transistor in the event of an abnormality, an interface unit that inputs and outputs a signal related to the operation of the protection circuit unit, a DC power supply, and an output voltage of the DC power supply. Stabilized power supply for stabilizing the, and the switching command to the pre-drive unit And a microcomputer for outputting a No., the said power transistor group and the pre-drive portion and the protective circuit unit and the interface unit is constituted by a monolithic IC, the monolithic IC
Is a power supply terminal to which the output voltage of the DC power supply is supplied,
The monolithic has a power supply voltage detection terminal for detecting an output voltage of the stabilized power supply, and an input terminal and an output terminal to which a signal related to the operation of the protection circuit unit is input and output via the interface unit. The input terminal and the output terminal of the IC are connected to the output terminal and the input terminal of the microcomputer for the microcomputer to control or detect the operation of the protection circuit unit, and the output voltage of the stabilized power supply is A motor control device configured to be supplied to a power supply terminal of the microcomputer and supplied to the interface section inside the monolithic IC via the power supply voltage detection terminal. 3. A monolithic I with a power transistor.
An overcurrent protection circuit for protecting the power transistor from an overcurrent, an overheat protection circuit for protecting the power transistor from overheating, or a power supply terminal of a microcomputer. Of a DC power supply monitoring circuit that performs undervoltage protection or overvoltage protection when the output voltage of the stabilized power supply supplied to or the output voltage of the DC power supply supplied to the power supply terminal of the monolithic IC becomes insufficient or excessive. Comprising at least one or more circuits, at the time of abnormal operation of at least one or more circuits constituting the protection circuit unit, at the same time to cut off all the conduction of the power transistor,
A signal related to the operation of the protection circuit unit is input and output to an input terminal and an output terminal of the monolithic IC via an interface unit configured inside the monolithic IC, and the input terminal and the output terminal are the protection circuit. There are at least one or more depending on the number of circuits constituting the above, wherein each of the input terminals and each of the output terminals of the monolithic IC are:
Any circuit that constitutes the protection circuit unit, the microcomputer being directly connected to each output terminal and each input terminal of the microcomputer for controlling and detecting the operation of each circuit constituting the protection circuit unit. 3. The motor control device according to claim 1, wherein the microcomputer is capable of determining whether or not the power transistor is turned off and the conduction of the power transistor is cut off. 4. A motor having a plurality of phases of drive windings, and a power transistor having a withstand voltage capable of withstanding an output voltage of a DC main power source obtained by rectifying and smoothing a commercial power source, at least more than the number of phases of the drive windings of the motor. , A power transistor group for connecting the drive winding of the motor to the positive or negative side of the DC main power source by switching, and switching each of the power transistors constituting the power transistor group based on a switching command signal. A pre-drive unit to be driven, a protection circuit unit that shuts off all conduction of the power transistor in the event of an abnormality, an interface unit that inputs and outputs a signal related to the operation of the protection circuit unit, a DC power supply, and the pre-drive unit to the A microcomputer for outputting a switching command signal, The word transistor group and the pre-drive portion and the protective circuit unit and said interface unit is constituted by a monolithic IC, the monolithic IC
Is a power supply terminal that simultaneously supplies the output voltage of the DC power supply and that detects the output voltage, and an input that outputs and outputs a signal related to the operation of the protection circuit section through the interface section. A terminal and an output terminal, and the input terminal and the output terminal of the monolithic IC are the output terminal and the input terminal of the microcomputer for the microcomputer to control or detect the operation of the protection circuit unit. It is connected and the output voltage of the DC power supply is supplied to the power supply terminal of the microcomputer and to the interface section inside the monolithic IC via the power supply terminal and the power supply voltage detection terminal. Motor control device. 5. A monolithic I with a power transistor.
An overcurrent protection circuit for protecting the power transistor from an overcurrent, an overheat protection circuit for protecting the power transistor from overheating, or a power supply terminal of a microcomputer. Alternatively, at least one or more circuits of a DC power supply monitoring circuit that performs undervoltage protection or overvoltage protection when the output voltage of the DC power supply supplied to the power supply terminal of the monolithic IC becomes insufficient or excessive, When at least one circuit constituting the protection circuit unit operates abnormally, all the conduction of the power transistor is cut off, and at the same time, a signal relating to the operation of the protection circuit unit is formed inside the monolithic IC. Input to the input and output terminals of the monolithic IC via At least one of the input terminal and the output terminal is present in accordance with the number of circuits forming the protection circuit, and the input terminal and the output of the monolithic IC are respectively provided. The terminals are directly connected to the respective output terminals and the respective input terminals of the microcomputer for controlling and detecting the operation of each circuit which constitutes the protection circuit section by the microcomputer, and constitute the protection circuit section. 5. The motor control device according to claim 4, wherein the microcomputer can determine which circuit operates to cut off the conduction of the power transistor.