JP7231206B2 - Switching power supply and motor drive control system using it - Google Patents

Description

The present invention relates to a switching power supply and a motor drive control system incorporating the switching power supply.

A switching power supply circuit generally includes a switching element that switches a DC input, a smoothing circuit provided on the output side of the switching element, and a switching control circuit that controls the switching element on and off. , the OFF time ratio (duty ratio) is controlled to obtain a stabilized DC power supply (output of the smoothing circuit). In the case of AC input, a rectifying/smoothing circuit for converting AC to DC is provided in the preceding stage.

It is necessary to stop the power supply from the switching power supply when an error occurs in the control device or power unit that operates by supplying power from the switching power supply, or when an emergency stop command is given. can be. In particular, in order to cut off the power supply line of the DC power supply for power supplied to the DC power unit, a large-sized element or device (FET or relay) that can withstand it is required. can't

Patent Document 1 discloses a resonant power supply device that prevents a switch element from being destroyed due to a high overvoltage applied when the power supply is cut off under a heavy load. In other words, this resonance type power supply is provided with voltage control means for narrowing down the output voltage based on the input power supply cutoff command signal, and detects that the output voltage has dropped sufficiently to initiate resonance in the primary circuit of the transformer. A power cutoff means for turning off the switch element is provided. As an output voltage control means, a saturable reactor with a control winding is inserted in the main circuit of the secondary winding of the transformer, and based on the power cutoff command signal, a current opposite in phase to that of the main circuit power supply is supplied to the control winding. It is configured to flow.

Since the power supply circuit of Patent Document 1 cuts off all the power supplied to the power unit, the operating power is also not supplied to the control device provided in the power unit, and subsequent control (for example, an error occurs) response, recovery processing, etc.). In particular, when the control device includes a processor, etc., initialization processing of the processor, etc. is required at the time of restoration (at the time of start-up).

Patent Literature 2 discloses a power supply for a robot system. In this robot system, in addition to the normal control section and drive section, first and second monitoring means are provided for detecting deviation from the robot's operating range and shutting off the drive power supply. The cutoff means and the first and second power cutoff means of the first and second monitoring means are connected in series between the drive power source and the motor that drives the robot. Since the three interrupting means are connected in series between the drive power supply and the motor, in any case, these interrupting means directly interrupt the driving power, and these interrupting means cannot withstand large currents. must be viable. Also, in Japanese Patent Application Laid-Open No. 2002-200010, there is a problem that the operation power supply to the control device provided in the robot system is not supplied.

Japanese Patent No. 2628198 Japanese Patent No. 5271499

The object of the present invention is to avoid a configuration in which the line of the drive power supply is cut off directly, and to secure the control power supply for the control system even if the supply of power for driving (driving) is cut off. and

A switching power supply device according to the present invention comprises a power source switching element for switching a DC input, a power source smoothing circuit provided on the output side of the power source switching device for outputting the power source, and the power source switching. a power supply circuit having a switching control circuit for controlling an element; and a power supply from the power supply circuit by turning off the switching element for power supply in response to a given power supply cutoff command signal. a control power supply switching element that switches the DC input, a control power supply smoothing circuit that is provided on the output side of the control power supply switching element and outputs the control power supply, and the control power supply and a control power supply circuit for continuously outputting the control power supply regardless of the presence or absence of the power cutoff command signal.

A switching power supply device according to the present invention comprises a power supply circuit for power and a power supply circuit for control. Then, when the power cutoff command signal is given, the power cutoff circuit stops the output (supply) of the power source (power, voltage, current) from the power source circuit for power. Stopping the power supply output is realized by turning off the power supply switching element in the power supply circuit for power supply. No other elements or equipment are required. Further, the switching power supply device of the present invention is provided with a control power supply circuit, and regardless of the presence or absence of the power cutoff command signal, this control power supply circuit outputs (supplies) the control power supply (power, voltage, current). Therefore, it is possible to secure the power supply for the control system in the power supply target device.

The switching power supply can be provided with a power source output section for the power source circuit for power source and a control power source output portion for the power source circuit for control. These power supply output section and control power supply output section are separate. Ground may be common. These power supply output units may be simple wiring, a part thereof, a wiring pattern, or the like, or may be output terminals. The switching power supply device can be provided with an input section or an input terminal for a power shutdown command signal. These output terminals and input terminals can also be implemented as one or more connectors.

When the input power supply is an AC power supply, the AC power supply is rectified and smoothed and used as a DC input for the power supply circuit for power and the power supply circuit for control.

Expressing the present invention from another point of view, the present invention comprises a power source switching element for switching a DC input, and a power source smoothing circuit provided on the output side of the power source switching device for outputting the power source. and a power source switching control circuit for controlling the power source switching element, wherein the power source switching element responds to input of a given power source cutoff command signal. A power cutoff circuit that turns off the power supply and stops the output of the power supply for power supply, a control power supply circuit that continues to output the control power supply regardless of the presence or absence of the input of the power cutoff command signal, and the above power supply circuit for power supply It has a power supply output terminal for power and a separate control power supply output terminal for the control power supply circuit.

In one embodiment, the power cutoff circuit provides a disable signal to an enable terminal of the power switching control circuit in response to the power cutoff command signal.

In another embodiment, in response to the power cutoff command signal, the power cutoff circuit forcibly cuts off the control output of the power switching control circuit for controlling the power switching element. This is a state in which the element is kept off. For example, a control output cutoff switching element is provided between the control output of the power supply switching control circuit and the power supply switching element, and the control output cutoff switching element is turned off in response to the power supply cutoff command signal. and

In still another embodiment, the power cutoff circuit cuts off the operating power input of the switching control circuit for the power source in response to the power cutoff command signal.

A motor drive control system equipped with a switching power supply according to the present invention comprises a motor drive device having a motor drive circuit for driving a motor, a motor control circuit for controlling the motor drive circuit, and a motor drive circuit for the motor drive device. a control power circuit for supplying control power to the motor control circuit of the motor drive device; It is equipped with a power cutoff circuit for stopping the output of the power source for power.

In one embodiment, the power supply circuit for power supply includes a switching element for switching a DC input, a smoothing circuit for power supply provided on the output side of the switching element for power supply, and a switching element for power supply. and a power supply switching control circuit for controlling, wherein the power cutoff circuit turns off the power supply switching element in response to the input of the power cutoff command signal.

1 is a block diagram showing the overall configuration of a motor drive control system including a switching power supply; FIG. 1 is a circuit diagram of a motive power supply circuit, and particularly shows an example of a shutdown (power cutoff) circuit; FIG. FIG. 3 is a circuit diagram of a power supply circuit for motive power, and particularly shows another example of a shutdown (power cutoff) circuit; FIG. 10 is a circuit diagram of a power supply circuit for motive power, and particularly shows still another example of a shutdown (power cutoff) circuit;

FIG. 1 is a block diagram showing the overall configuration of a motor drive control system including a switching power supply.

The motor drive control system is composed of a switching power supply device 10 and a motor drive control device 80 .

Switching power supply 10 includes two power supply circuits. That is, a power supply circuit 20 for power (driving) and a power supply circuit 60 for control. The configurations of these power supply circuits 20 and 60 are basically the same except that the motive power supply circuit 20 has a shutdown circuit (power supply cutoff circuit) 40 . However, the output voltage, capacity (rating), etc. of these power supply circuits 20 and 60 may be different, and along with this, the size and rating of the electric and electronic parts and elements that make up these power supply circuits 20 and 60 are different. etc. may differ.

The power output from these power supply circuits 20, 60 (power supply 10) passes through a power cable (cord, line) 90, a power output connector 90A on the power supply 10 side, and a power input connector 90B on the motor drive control device 80 side. It is supplied to the motor drive control device 80 . The connectors 90A and 90B have power supply terminals (power supply output/input section), control power supply terminals (control power supply output/input section), and earth (ground) terminals.

Further, the power supply 10 (power supply circuit 20) and the motor drive controller 80 are provided with connectors 91A and 91B for inputting and outputting shutdown (power supply cutoff) command signals, which are detachably connected by a line 91. FIG. These connectors 91A, 91B may be incorporated into the power connectors 90A, 90B. Alternatively, the two devices 10 (20) and 80 may be connected by a line without providing the connectors 91A and 91B. Both devices 10 and 80 may be electrically connected directly (not detachably) without providing connectors 90A and 90B for power supply. In this case, the power supply output and input section for power and the control power supply output and input section will be part of the wiring (including the wiring pattern). The devices 10 and 80 may be housed in separate housings, or the devices 10 and 80 may be integrated into one housing.

A motive (driving) power supply circuit 20 of the switching power supply device 10 is a switching power supply circuit. An alternating current (AC) (for example, a commercial AC power supply) input is full-wave rectified by a rectifier circuit (for example, a diode bridge rectifier circuit, as will be described later) 12 and smoothed by a smoothing capacitor 13 . The rectified and smoothed DC input passes through the primary side coil (winding) of a transformer (step-down transformer) 14 and is switched on and off by a power supply switching element 22, generally at a high repetition frequency. The switching element 22 is an n-type channel FET (field effect transistor) in the illustrated example, and its source is grounded via a resistor 23 . The power supply switching control circuit 21 outputs a control output for controlling the ON/OFF of the FET 22, and the duty ratio of the control output (square wave or pulse) is feedback-controlled as will be described later. The output of switching control circuit 21 is applied to the gate of FET22. Alternating current electrical energy is transmitted from the primary side of the transformer 14 to the secondary side by switching the FET 22 . The alternating current induced in the secondary coil of the transformer 14 is accumulated in the smoothing capacitor 46 and smoothed, and a direct current (DC) is output and applied to the power supply output terminal of the connector 90A.

The DC voltage smoothed on the secondary side of transformer 14 is applied to switching control circuit 21 through feedback control circuit 30 . As a result, the duty ratio of the control signal (pulse or square wave signal) applied to the gate of the FET 22 of the switching control circuit 21 is adjusted so that the secondary side output DC voltage is constant.

As will be described later, when a shutdown (power cutoff) command signal is given from the motor drive control device 80 to the shutdown (power cutoff) circuit 40 via the input connector 91A, the shutdown circuit 40 switches the switching element 22 through the switching control circuit 21. to stop the operation of (turn it off). That is, the control signal input to the base of the FET 22 is stopped (held at L level), and the FET 22 stops its switching operation (turns off). As a result, electrical energy is no longer transmitted to the secondary side of the transformer 14, and power supply to the connector 90A of the power source is stopped.

Examples of specific configurations of the shutdown circuit 40 will be described in detail with reference to FIGS. It should be understood to represent all the manner in which the circuit 21 is deactivated or the switching element 22 is deactivated (ie the switching element is turned off).

Note that the transformer 14 of the power supply circuit 20, the transformer 54 of the control power supply circuit 60, and the photocouplers 34 and 42 of the feedback control circuits 30 and 39 (also photocouplers included in the feedback control circuit 39), which will be described later, are connected to the power supply. It is for electrically insulating the input side and output side (primary side and secondary side of transformers 14, 54) of device 10 (power supply circuits 20, 60).

The control power supply circuit 60 is not provided with a circuit for shutting off the power supply corresponding to the shutdown circuit 40 . Other than this, both power supply circuits 20 and 60 have the same electrical configuration.

Just to be sure, the control power supply circuit 60 of the switching power supply device 10 is also a switching power supply circuit. The AC input is full-wave rectified by the rectifier circuit 52 and smoothed by the smoothing capacitor 53 . The rectified and smoothed direct current passes through the primary side coil (winding) of a transformer (step-down transformer) 54 and is switched on and off by a switching element (FET) 62 for control power supply. The source of switching element 62 is grounded through resistor 63 . The output of the switching control circuit 61 for control power supply is given to the gate of the FET 62 . Switching of the FET 62 transfers generally high-frequency AC electrical energy from the primary side of the transformer 54 to the secondary side thereof. The alternating current induced in the secondary coil of the transformer 54 is accumulated in the smoothing capacitor 56 and smoothed, and a direct current (DC) is applied to the control power supply output terminal of the connector 90A.

The DC voltage smoothed on the secondary side of transformer 54 is applied to switching control circuit 61 through feedback control circuit 39 . As a result, the duty ratio of the control signal applied to the gate of the FET 62 is adjusted so that the secondary side output DC voltage is constant.

The control power supply circuit 60 is not provided with a shutdown circuit (power cutoff circuit) for stopping the operation of the switching control circuit 61 or stopping (turning off) the operation of the FET 62 . Therefore, even if the shutdown command signal is output from the motor drive control device 80, the control power supply circuit 60 does not stop its operation, and continues to output the control power supply to the motor drive control device via the connectors 90A and 90B. Continue to supply to 80.

As described above, the motor drive control device 80 has a connector 90B having a power source input terminal, a control power source input terminal, and a ground terminal. Operate.

First, the motive power is smoothed by a smoothing capacitor 84 and supplied to a motor driver (driving circuit) 82 . A motor driver 82 drives, through a motor connector 85, a motor (not shown) incorporated in a robot, an actuator, or other power devices under the control of a control device (control circuit) 81. FIG.

The control device 81 controls the drive of the motor, monitors the power unit including the motor (detection of errors, generation of warnings, countermeasures against errors, recovery, etc.), generation of shutdown (power off) command signals, and other controls. take action. The control power supply that is output from the control power supply circuit 60 of the power supply device 10 and is input via the connector 90B is converted in the control power supply generation circuit 83 into a voltage suitable for the operation of the control device 81 and supplied to the control device 81 . The control device 81 performs the predetermined control operation with the power supplied from the control power generation circuit 83 .

The control power supplied to the motor drive controller 80 is also provided to an external circuit 88 via an emergency stop connector 86 . The external circuit 88 is, for example, an emergency stop circuit including an emergency stop button (not shown). When the emergency stop button is pushed, the control power supply is input to the pressure reducing (stepping down) circuit 87 via the connector 86 as an emergency stop signal. This emergency stop signal is converted into a voltage acceptable to the control device 81 by the pressure reduction circuit 87 and is input to the control device 81 .

The control device 81 detects when a situation occurs in which the supply of power for power should be stopped and generates a shutdown (power cutoff) command signal. An example of a situation in which the supply of power for power should be stopped is when an emergency stop signal is input from the external circuit 88 via the pressure reducing circuit 87, or when an error occurs in a power device such as a robot including a motor or an actuator. . The shutdown command signal output from the control device 81 is input to the shutdown circuit 40 of the power supply circuit 20 via the connector 91B, the line 91, and the connector 91A, and the power supply from the power supply circuit 20 is stopped as described above. do. Since the control power supply circuit 60 continues to operate, control power continues to be supplied to the motor drive controller 80, particularly its controller 81.

The shutdown command signal does not necessarily have to be generated by the controller 81 of the motor drive controller 80 . For example, in a configuration in which the motor drive control device 80 is supervised by a higher control device, when the control device 81 of the motor drive control device 80 detects an emergency stop signal or an error, it is notified to the higher control device. Report. Upon receipt of this report, the host control device judges or decides whether or not to output a shutdown command signal, and gives the shutdown command signal to the shutdown circuit 40 of the power supply circuit 20 when it judges and decides to output it. The host control device may be one that controls a plurality of motor drive control devices. The power supply device 10 may be configured to supply motive power and control power to these higher-level control devices and one or more motor drive control devices.

FIG. 2 is for showing a specific configuration example of the shutdown circuit 40, and shows a specific configuration of the power supply circuit 20 for power. In FIG. 2, the same reference numerals are assigned to the same items as those shown in FIG. 1 to avoid redundant description.

The power supply switching control circuit 21 is an IC circuit having an enable terminal ENB. Many types of switching control circuit ICs for switching power supplies are available on the market regardless of whether they have an enable terminal or not, and among them, a switching control circuit IC having an enable terminal ENB can be selected. The IC 21 is in an operating state (enabled) when the power supply voltage Vcc (H level) is applied to the enable terminal ENB through the pull-up resistor 43, and controls the switching element 22 on and off. When there is no input to the enable terminal ENB (ground level, L level), the IC21 is disabled.

In FIG. 2, the rectifier circuit 12 is a diode bridge rectifier circuit. A primary side coil (winding) of the transformer 14 is indicated by reference numeral 15 . A switching element 22 and a resistor 23 are connected in series to the primary coil 15 . There are two secondary coils (windings) of the transformer 14, indicated by reference numerals 16 and 17. The secondary coil 16 is for the output side of the power supply for power, and the output side of the secondary coil 16 is connected to a rectifying/smoothing circuit consisting of a diode 45 (not shown in FIG. 1) and a capacitor 46, whose output is It is connected to the power supply output terminal of the connector 90A.

The secondary coil 17 is for the power supply of the switching control circuit 21, and has a smoothing capacitor 24 and a Zener diode 25 connected across it. Both ends of the smoothing capacitor 24 are connected to the power supply terminal V _B and the ground terminal GND of the switching control circuit 21 . A rectifying diode may be connected in series with the coil 17 .

A starting resistor 18 with a large resistance value is connected between the primary side coil 15 and the secondary side coil 17 of the transformer 14 . When the AC power source of the power supply device 10 is turned on, the electric charge accumulated in the capacitor 13 flows through the starting resistor 18, the electric charge is accumulated in the capacitor 24, and the power supply voltage Vcc is generated. Applied across enable terminal ENB. As a result, the switching control circuit 21 starts to operate, and the FET 22, which is a switching element, begins to be controlled to turn on and off. As will be described later, when the enable terminal ENB becomes L level due to the input of a shutdown command signal, the switching control circuit 21 stops operating and the FET 22 is turned off. At this time as well, the current continues to flow through the resistor 18 to the capacitor 24, so the operating power supply for the switching control circuit 21 is ensured. When the voltage applied to the enable terminal ENB becomes H level again, the switching control circuit 21 starts operating again. A resistor 18 , a capacitor 24 and a Zener diode 25 are a power supply circuit for the switching control circuit 21 . However, as the power supply for the switching control circuit 21 of the motive power supply circuit 20, the control power supply of the control power supply circuit 60, which continues to supply the control power supply regardless of the presence or absence of the shutdown command signal, may be used.

Feedback control circuit 30 includes a shunt regulator 33 . A power output voltage (the voltage across the capacitor 46) is applied to the series circuit of the shunt regulator 33 and the photodiode of the photocoupler 34. FIG. On the other hand, this power output voltage is also applied to the series-connected voltage dividing circuit of resistors 31 and 32 , and the voltage divided by the voltage dividing circuit is applied to the control terminal of the shunt regulator 33 . This divided voltage is compared with the internal reference voltage of the shunt regulator, and when the divided voltage is higher than the internal reference voltage, a current flows through the shunt regulator 33 and the photodiode of the photocoupler 34 emits light. As a result, the phototransistor of the photocoupler 34 is turned on, and the power supply voltage Vcc is applied to the feedback terminal FB of the switching control circuit 21 . When a voltage is applied to the feedback terminal FB, the duty ratio of the control output of the switching control circuit changes in the direction of increasing the OFF time of the switching element FET22. As a result, the power output voltage is lowered, and the power output voltage is stabilized.

In the shutdown circuit 40A, the phototransistor of the photocoupler 42 is connected between the enable terminal ENB of the switching control circuit 21 and ground. The enable terminal ENB is connected to the power supply voltage Vcc through the pull-up resistor 43 as described above. On the other hand, the anode of the photodiode of the photocoupler 42 is connected to the shutdown command signal input connector 91A through the resistor 41, and its cathode is grounded.

The connector 91A is held at L level in a normal state. When an H level shutdown command signal is input to the connector 91A, the photodiode of the photocoupler 42 emits light, the phototransistor is turned on, the enable terminal ENB of the switching control circuit 21 is grounded (becomes L level), and switching control is performed. The operation of the circuit 21 is stopped and its control output is kept at the ground state (L level). As a result, the switching element FET22 is kept off. When the switching element FET22 is turned off, no voltage is induced in the secondary coil 16 of the transformer 14, so the output of the power supply circuit 20 (output to the connector 90A) stops. Even in this case, since the capacitor 24 is charged, the switching control circuit 21 continues to be supplied with the power supply voltage Vcc. When the input shutdown command signal returns to L level, the phototransistor of the photocoupler 42 is turned off, so that the power supply voltage Vcc is applied to the enable terminal ENB of the switching control circuit 21, and the switching control circuit 21 is put into operation. Since the switching element FET22 is repeatedly turned on and off, the output of the motive power supply circuit 20 is restored.

If the shutdown command signal is a pulse signal, a hold circuit for holding the H level by this input pulse may be provided. Then, the H level held by the shutdown end signal should be returned to the L level.

As a specific configuration example of the control power supply circuit 60, it can be realized by excluding the shutdown circuit 40A from the power supply circuit shown in FIG. . Of course, the motive power supply circuit 20 and the control power supply circuit 60 have different power supply capacities, so naturally the ratings of the circuit elements are different.

FIG. 3 shows another example of a shutdown circuit. This shutdown circuit 40B forcibly lowers the gate of the switching element FET22 to the ground (L) level in response to the shutdown command signal. The switching control circuit 21 continues to operate. The same reference numerals are given to the same items as those shown in FIG. 2 to avoid redundant description. The switching control circuit 21 may be one without an enable terminal.

A transistor (control output cutoff switching element) 44 is connected between the gate of the switching element FET22 and ground. A current limiting resistor 45 is connected between the control output terminal of the switching control circuit 21 and the transistor 44 . The phototransistor of photocoupler 42 is connected between the positive side of control power supply Vcc and the base of transistor 44 via resistor 47 .

In a normal state, the transistor 44 is off, and the control output of the switching control circuit 21 is applied to the gate of the switching element FET22, so the FET22 is repeatedly turned on and off. When an H-level shutdown signal is input, the phototransistor of the photocoupler is turned on, and an H-level signal is applied to the base of the transistor 44, so that the transistor 44 is turned on and the gate of the switching element FET22 is grounded (L) level. is pulled down to , and is turned off. This stops the output of the power supply for power. When the shutdown command signal returns to L level, the power supply circuit 20 returns to the normal state.

FIG. 4 shows still another example of the shutdown circuit. This shutdown circuit 40C cuts off the supply of operating power to the switching control circuit 21. FIG. For this purpose, an FET 50 as a switching element is connected between the operating power supply terminal _VB of the switching control circuit 21 and the positive side of the control power supply Vcc (the positive potential side of the capacitor 24). Voltage dividing resistors 26 and 27 and a transistor 51 are connected in series between the positive side of the control power supply Vcc and the ground, and the connection point of the resistors 26 and 27 is connected to the gate of FET50. On the other hand, the resistor 49 and the phototransistor of the photocoupler 42 are connected between the positive side of the control voltage Vcc and the ground, and the connection point between the resistor 49 and this transistor is connected to the base of the transistor 51 via the resistor 48. there is

In a normal state, the phototransistor of the photocoupler 42 is off, the transistor 51 is on, and the FET 50 is _on . The switching control circuit 21 operates normally, and the power supply circuit 20 for power is outputting the power for power.

When the shutdown command signal is input, the phototransistor of the photocoupler 42 is turned on and the transistor 51 is turned off. FET 50 is turned off because of the potential. As a result, the switching control circuit 21 is no longer supplied with the power supply voltage Vcc, so that the switching control circuit 21 stops operating, no control signal is applied to the gate of the FET 22 (floating state), and the FET 22 is turned off. Therefore, the voltage output of the power supply circuit 20 for power stops.

10 Switching power supply
12, 45, 52 rectifier circuit
13, 24, 46, 53, 56, 84 smoothing capacitor
14, 54 transformer
20 Power supply circuit for power (drive)
21, 61 Switching control circuit
22, 62 Switching element (FET)
25 Zener Diode
30, 39 Feedback control circuit
34, 42 Photo coupler
40, 40A, 40B, 40C Shutdown (power supply cutoff) circuit
44 Transistor (switching element)
50 FET (switching element)
60 Control power supply circuit
80 motor drive controller
81 Controller
82 Motor Driver
83 Control voltage generation circuit
90 power cable
90A, 90B Power supply output, input connector
91 lines
91A, 91B Shutdown (power off) command signal input/output connector

Claims (10)

A power supply transformer including a primary side coil and two secondary side coils, a power supply switching element connected to the primary side coil of the power supply transformer for switching a DC input, and an output side of the power supply switching element a power power smoothing circuit provided in parallel with one of the secondary coils of the power power transformer for outputting the power for power, and the DC input from the other secondary coil of the power power transformer; Via a first starting resistor connected in series with the other secondary coil, and a first capacitor connected in parallel with the other secondary coil and connected in series with the first starting resistor a power supply circuit having a power supply switching control circuit that operates according to the generated voltage to control the power supply switching element;
a power cutoff circuit for turning off the power switching element in response to a given power cutoff command signal to stop the output of the power source from the power source circuit;
A control power supply transformer including a primary side coil and two secondary side coils, a control power supply switching element connected to the primary side coil of the control power supply transformer for switching a DC input, and an output side of the control power supply switching element a control power supply smoothing circuit provided in parallel with one of the secondary coils of the control power transformer for outputting control power , and the DC input from the other secondary coil of the control power transformer; Via a second starting resistor connected in series with the other secondary coil and a second capacitor connected in parallel with the other secondary coil and in series with the second starting resistor A control power source switching control circuit that operates by the generated voltage to control the control power source switching element, and a control power source circuit that continues to output the control power source regardless of the presence or absence of the power cutoff command signal. ，
switching power supply. A power supply transformer including a primary side coil and two secondary side coils, a power supply switching element connected to the primary side coil of the power supply transformer for switching a DC input, and a power supply switching element. a smoothing circuit for the power power supply provided on the output side in parallel with one of the secondary coils of the transformer for the power power supply; Operated by a voltage generated through a first starting resistor connected in series with the side coil and a first capacitor connected in parallel with the other secondary side coil and connected in series with the first starting resistor a power source switching control circuit for controlling the power source switching element and outputting the output of the power source smoothing circuit to the power source output section;
A control power supply transformer including a primary side coil and two secondary side coils, a control power supply switching element connected to the primary side coil of the control power supply transformer for switching a DC input, and the control power supply switching element A control power supply smoothing circuit provided on the output side in parallel with one of the secondary coils of the control power supply transformer , and a control power supply smoothing circuit, from the DC input, the other secondary coil of the control power supply transformer, and the other secondary coil of the control power supply transformer. Operated by a voltage generated through a second starting resistor connected in series with the side coil and a second capacitor connected in parallel with the other secondary side coil and connected in series with the second starting resistor a control power source switching control circuit for controlling the control power source switching element as a control power source, and for outputting the output of the control power source smoothing circuit to the control power source output unit; a power cutoff circuit that turns off the switching element for the power power source in response to a command signal to stop the output of the power power source for the power source to the power source output unit for the power source;
switching power supply. A power supply transformer including a primary side coil and two secondary side coils, a power supply switching element connected to the primary side coil of the power supply transformer for switching a DC input, and an output side of the power supply switching element a power power smoothing circuit provided in parallel with one of the secondary coils of the power power transformer for outputting the power for power, and the DC input from the other secondary coil of the power power transformer; Via a first starting resistor connected in series with the other secondary coil, and a first capacitor connected in parallel with the other secondary coil and connected in series with the first starting resistor A switching power supply device comprising a power supply circuit for power supply having a switching control circuit for power supply for controlling the switching element for power supply by being operated by the generated voltage ,
a motive power output section of the motive power supply circuit, a control power supply output section of the control power supply circuit separate therefrom;
a power cutoff circuit for turning off the power switching element in response to a given power cutoff command signal to stop output of the power source to the power source output section;
A control power supply transformer including a primary side coil and two secondary side coils, a control power supply switching element connected to the primary side coil of the control power supply transformer for switching a DC input, and an output side of the control power supply switching element a control power supply smoothing circuit provided in parallel with one of the secondary coils of the control power transformer for outputting control power , and the DC input from the other secondary coil of the control power transformer; Via a second starting resistor connected in series with the other secondary coil and a second capacitor connected in parallel with the other secondary coil and in series with the second starting resistor It has a control power supply switching control circuit that operates by the generated voltage to control the control power supply switching element, and controls to keep outputting the control power supply to the control power supply output unit regardless of the presence or absence of the power cutoff command signal. a power supply circuit for
switching power supply. 4. The apparatus according to claim 2, further comprising a first output terminal for said motive power output section, a second output terminal for said control power supply output section, and an input terminal for said power cutoff command signal. A switching power supply as described. 5. The apparatus according to any one of claims 1 to 4, wherein a common AC power supply input terminal is provided, and AC power input to the AC power supply input terminal is rectified and smoothed to be used as DC input to the power supply circuit for power and the power supply circuit for control. The switching power supply device according to the item. A power supply transformer including a primary side coil and two secondary side coils, a power supply switching element connected to the primary side coil of the power supply transformer for switching a DC input, and a power supply switching element. A power power smoothing circuit provided in parallel with one secondary coil of the power power transformer on the output side to output the power for power, and a smoothing circuit for outputting the power for power, and a secondary side of the other secondary of the power power transformer from the DC input. a coil, a first starting resistor connected in series with the other secondary coil, and a first capacitor connected in parallel with the other secondary coil and in series with the first starting resistor. A switching power supply device comprising a power supply circuit for power supply having a power supply switching control circuit for controlling the switching element for power supply by operating with a voltage generated through a power supply circuit,
a power cutoff circuit for turning off the switching element for the power power supply in response to input of a given power cutoff command signal to stop the output of the power power supply;
A control power supply transformer including a primary side coil and two secondary side coils, a control power supply switching element connected to the primary side coil of the control power supply transformer for switching a DC input, and the control power supply switching element A control power supply smoothing circuit that is provided in parallel with one secondary coil of the control power transformer on the output side and outputs control power, and a control power supply smoothing circuit that outputs control power from the DC input and the other secondary side of the control power transformer. a coil, a second starting resistor connected in series with the other secondary coil, and a second capacitor connected in parallel with the other secondary coil and connected in series with the second starting resistor. and a control power supply switching control circuit that operates by the voltage generated through the control power supply to control the control power supply switching element, and controls to continue outputting the control power supply regardless of whether the power supply cutoff command signal is input or not. a power supply circuit for
A power supply output terminal for power supply of the power supply circuit for power supply and a power supply output terminal for control of the power supply circuit for control separate therefrom,
switching power supply. 7. The switching power supply according to claim 1, wherein said power cutoff circuit provides a disable signal to an enable terminal of said motor power switching control circuit in response to said power cutoff command signal. Device. In response to the power cutoff command signal, the power cutoff circuit forcibly outputs a control output of the power switching control circuit controlling the power switching element to keep the power switching element off. 7. The switching power supply according to any one of claims 1 to 6, wherein the switching power supply is set to a state. 7. The switching power supply according to claim 1, wherein said power cutoff circuit cuts off the operating power input of said switching control circuit for power supply in response to said power cutoff command signal. . A motor drive device having a motor drive circuit for driving a motor and a motor control circuit for controlling the motor drive circuit,
a power supply circuit for supplying power to the motor drive circuit of the motor drive device;
a control power supply circuit that supplies control power to the motor control circuit of the motor drive device; circuit,
with
The power supply circuit for power,
A power supply transformer including a primary side coil and two secondary side coils, a power supply switching element connected to the primary side coil of the power supply transformer for switching a DC input, and a power supply switching element. a smoothing circuit for the power power supply provided on the output side in parallel with one of the secondary coils of the transformer for the power power supply; Operated by a voltage generated through a first starting resistor connected in series with the side coil and a first capacitor connected in parallel with the other secondary side coil and connected in series with the first starting resistor and a power supply switching control circuit for controlling the power supply switching element,
wherein the power cutoff circuit turns off the power switching element in response to the input of the power cutoff command signal,
The control power supply circuit is
A control power supply transformer including a primary side coil and two secondary side coils, a control power supply switching element connected to the primary side coil of the control power supply transformer for switching a DC input, and the control power supply switching element A control power supply smoothing circuit that is provided in parallel with one secondary coil of the control power transformer on the output side and outputs control power, and a control power supply smoothing circuit that outputs control power from the DC input and the other secondary side of the control power transformer. a coil, a second starting resistor connected in series with the other secondary coil, and a second capacitor connected in parallel with the other secondary coil and connected in series with the second starting resistor. and a control power supply switching control circuit that operates by the voltage generated through the control power supply to control the control power supply switching element, and continues to output the control power supply regardless of the presence or absence of the power supply cutoff command signal input. be,
Motor drive control system.

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