JP2018007534A - Ac servo driver driving power source discharge control circuit and ac servo driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an AC servo driver driving power source discharge control circuit and an AC servo driver which make possible to perform a rapid discharge operation without using a complicated circuit configuration.SOLUTION: An AC servo driver driving power source discharge control circuit 10 comprises: discharge means 1; switch means 2 for switching the energization to the discharge means 1; discharge control signal generation means 3 provided in parallel with the discharge means 1 and controlling the operation of the switch means 2; and source voltage-monitoring means 4 connected to the discharge control signal generation means 3 and applying a voltage thereto. The wiring in the AC servo driver driving power source discharge control circuit is arranged so that a driving source voltage is also applied to the discharge control signal generation means 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an AC servo driver drive power supply discharge control circuit and an AC servo driver, and more particularly to a drive power supply discharge technique in an AC servo driver constituting an AC servo motor control system.

  FIG. 3 is a circuit diagram showing a basic form of a discharge circuit in a conventional AC servo driver. As shown in the figure, in the conventional normal AC servo driver drive power supply discharge method, a constant discharge circuit (resistor) 31 provided in parallel with a capacitor 37 for smoothing the rectified voltage from the rectifier 39 is always discharged. That's it. As another configuration of the discharge circuit, a method (not shown) of monitoring the disconnection of the AC power supply by software such as a CPU and performing rapid discharge is also used.

  Many technical proposals have been made for AC servo motor control. For example, in Patent Document 1 described later, as a control device for an AC servo motor without risk of DC bus burning, AC power input means, rectifying means for rectifying alternating current from the AC power input means to direct current, and rectified voltage from the rectifying means Capacitor for smoothing, DC power input means inserted between the rectifier means and the capacitor, AC or DC input specification selection means, means for discharging the capacitor voltage via the switching element when the power is cut off during AC input specifications, In an AC servo motor control device including an AC voltage detection means and a DC bus voltage detection means, when the control device is activated and an AC input is selected, the transistor (switching element) is set for a predetermined time (from the maximum voltage of the DC bus). (Discharge time until it reaches the lowest level x margin) ON to discharge the capacitor only once at the first startup, then Discharge stop OFF the transistor, then AC voltage not detected and a DC voltage is configured to emit an alarm power specification errors is disclosed in the case of more than a predetermined level.

Japanese Unexamined Patent Publication No. 2003-189688 “AC Servo Motor Control Device” (Japanese Patent No. 4178364)

  Now, in the case of the conventional system shown in FIG. 3, that is, the driving power source discharging system by constant discharge, there is a problem that the discharging time after the driving power source is cut off becomes long and rapid discharge cannot be performed. On the other hand, in the case of a system in which a CPU or the like is incorporated in a discharge circuit, although rapid discharge is possible, there is a problem that the circuit becomes complicated.

  Therefore, the problem to be solved by the present invention is to provide an AC servo driver drive power supply discharge control circuit and an AC servo driver that eliminate the problems of the prior art and can perform rapid discharge without using a complicated circuit configuration. Is to provide.

  As a result of studying the above problems, the inventor of the present application has not only input the output of the AC power supply monitoring circuit to the discharge control IC, but also uses the drive power supply voltage itself before discharge for discharge control, so that only hardware can be used. It has been found that rapid discharge of the drive circuit can be realized, and the present invention has been completed based on this. That is, the invention claimed in the present application, or at least the disclosed invention, as means for solving the above-described problems is as follows.

[1] A circuit for controlling the discharge of the AC servo driver drive power supply, the discharge means, the switch means for switching energization to the discharge means, and the operation of the switch means provided in parallel with the discharge means A discharge control signal generating means for controlling the power supply, and a power supply voltage monitoring means for connecting to the discharge control signal generating means and applying a voltage thereto, and a drive power supply voltage is also applied to the discharge control signal generating means. An AC servo driver drive power supply discharge control circuit, wherein the AC servo driver drive power supply discharge control circuit is connected.
[2] When the power is turned on, the discharge control signal generation means is ON and the switch means is OFF, so that no current flows through the discharge means, and when the power is cut off, the discharge control signal generation means is OFF, and the switch means The AC servo driver drive power supply discharge control circuit according to [1], wherein when the is ON, a current flows through the discharge means and the drive power supply is rapidly discharged.

[3] A charge lamp is connected in series to the discharge control signal generation means, and the smoothing capacitor is in a charged state by being lit in a power-on state, [1] Or the AC servo driver drive power supply discharge control circuit according to [2].
[4] The AC servo driver drive power supply discharge control circuit according to any one of [1] to [3], wherein no discharge means is provided by a CPU or software.
[5] The discharge means is a resistor, the switch means and the discharge control signal generation means are FETs, and the power supply voltage monitoring means is a voltage detector, [1] to [4] The AC servo driver drive power supply discharge control circuit as described.
[6] An AC servo driver comprising the AC servo driver drive power supply discharge control circuit according to any one of [1] to [5].

  Since the AC servo driver drive power supply discharge control circuit and the AC servo driver of the present invention are configured as described above, according to this, a simple circuit only by hardware can be used without using a complicated circuit configuration by software such as a CPU. Depending on the circuit configuration, rapid discharge of the AC servo driver can be realized. The technique disclosed in the above literature is aimed at preventing the DC bus from burning, and is not related to the present invention related to the rapid discharge system with a simple configuration.

It is a circuit diagram which shows the basic composition of the AC servo driver drive power supply discharge control circuit of this invention. It is a circuit diagram which shows the Example of AC servo driver drive power supply discharge control circuit of this invention. It is a circuit diagram which shows the form of the basic discharge circuit in the conventional AC servo driver.

The present invention will be described in detail below with reference to the drawings.
FIG. 1 is a circuit diagram showing a basic configuration of an AC servo driver drive power supply discharge control circuit of the present invention. As shown in the figure, this discharge control circuit 10 is a circuit for controlling the discharge of the AC servo driver drive power supply, and is in parallel with the discharge means 1, the switch means 2 for switching energization to the discharge means 1, and the discharge means 1. A discharge control signal generation unit 3 provided for controlling the operation of the switch unit 2 and a power supply voltage monitoring unit 4 connected to the discharge control signal generation unit 3 and applying a voltage thereto are provided. The main configuration is that the means 3 is wired so that the drive power supply voltage is also applied.

  As the discharge means 1, the switch means 2, the discharge control signal generation means 3, and the power supply voltage monitoring means 4, any element can be used as long as it is an element or a circuit having these functions. For example, a resistor can be suitably used as the discharge means 1, an FET as the switch means 2, an FET as the discharge control signal generating means 3, and a voltage detector as the power supply voltage monitoring means 4.

  With this configuration, in the present discharge control circuit 10, the power supply voltage monitoring means 4 for monitoring the voltage of the AC power supply 5 applies a voltage to the discharge control signal generating means 3, while the drive power supply generated via the rectifying means 9. The voltage is also applied to the discharge control signal generating means 3. The operation of the switch means 2 is controlled by the discharge control signal generating means 3 that obtains these two inputs, and the energization of the discharge means 1 is switched (ON, OFF) by the switch means 2. Thereby, execution and stop of the rapid discharge in the discharge means 1 are switched.

  The AC servo driver drive power supply discharge control circuit 10 is configured such that when the AC power supply 5 is turned on, the discharge control signal generation means 3 is turned on, and the switch means 2 is turned off. No current flows through the discharge means 1, and therefore no discharge is performed. On the other hand, when the AC power source 5 is in the power shut-off state, the discharge control signal generating unit 3 is in an OFF state, whereby the switch unit 2 is in an ON state. The drive power supply is rapidly discharged.

  As shown in the figure, the AC servo driver drive power supply discharge control circuit 10 has a charge lamp 6 connected in series to the discharge control signal generating means 3, and when the AC power supply 5 is turned on, it is lit to charge the smoothing capacitor 7. It can be set as the structure shown that it is in a state. With this configuration, it is displayed that the drive power supply is not discharged when the charge lamp 6 is turned on, and that the drive power supply is rapidly discharged when the charge lamp 6 is turned off.

  As described above, the discharge control circuit 10 of the present invention can rapidly discharge the drive power supply only by the hardware configuration, and therefore it is not necessary to include a discharge means by a CPU or software. The AC servo driver itself provided with the AC servo driver driving power supply discharge control circuit described above and the AC servo system provided with such an AC servo driver are also within the scope of the present invention.

  FIG. 2 is a circuit diagram showing an embodiment of the AC servo driver drive power supply discharge control circuit of the present invention. As shown in the figure, in this example circuit 210, the switch means 22 (FET-Q1) for passing a current to the discharge means 21 (discharge resistor R4) is in an OFF state while the AC power supply 25 input is turned on (ON). Therefore, no discharge is made. Instead, a current flows through the charge lamp 26 (LED1) and lights up, indicating that the smoothing capacitor 27 is charged.

  When the input of the AC power supply 25 is cut off (OFF), the potential from the power supply voltage monitoring means 24 gradually decreases, thereby turning off the discharge control signal generating means 23. Thereby, the gate voltage of the switch means 22 (FET-Q1) rises, and the switch means 22 (FET-Q1) is turned on. When the switch unit 22 (FET-Q1) is turned on, a current flows through the discharge unit 21 (discharge resistor R4), and a rapid discharge of the DC link voltage (PWR) becomes possible.

  According to the AC servo driver drive power supply discharge control circuit and the AC servo driver of the present invention, the AC power supply of the AC servo driver can be rapidly discharged only by hardware using the AC power supply monitoring and the drive power supply voltage of itself. A complicated circuit configuration by software such as a CPU is not necessary. Therefore, the invention is highly industrially applicable in the AC servo motor field and all related fields.

DESCRIPTION OF SYMBOLS 1, 21 ... Discharge means 2, 22 ... Switch means 3, 23 ... Discharge control signal generation means 4, 24 ... Power supply voltage monitoring means 5, 25 ... AC power supply 6, 26 ... Charge lamp 7, 27 ... Smoothing capacitor 9, 29 ... Rectifying means 10, 210 ... AC servo driver drive power supply discharge control circuit 31 ... always discharge circuit (resistance)
35 ... AC power supply 37 ... Smoothing capacitor 39 ... rectifying means

Claims (6)

A circuit for controlling the discharge of an AC servo driver drive power supply, comprising: a discharge means; a switch means for switching energization to the discharge means; and an operation of the switch means provided in parallel with the discharge means A discharge control signal generating unit; and a power supply voltage monitoring unit that is connected to the discharge control signal generating unit and applies a voltage to the discharge control signal generating unit. The discharge control signal generating unit is wired so that a driving power supply voltage is also applied. An AC servo driver drive power supply discharge control circuit. When the power is turned on, the discharge control signal generating means is ON, and when the switch means is OFF, no current flows through the discharge means. When the power is cut off, the discharge control signal generating means is OFF and the switch means is ON. 2. The AC servo driver drive power supply discharge control circuit according to claim 1, wherein a current flows through the discharge means and the drive power supply is rapidly discharged. The charge control signal generating means includes a charge lamp connected in series, and is lit in a power-on state to indicate that the smoothing capacitor is in a charge state. The AC servo driver drive power supply discharge control circuit described. 4. The AC servo driver drive power supply discharge control circuit according to claim 1, wherein a discharge means by a CPU or software is not provided. 5. The AC servo driver according to claim 1, wherein the discharge means is a resistor, the switch means and the discharge control signal generation means are FETs, and the power supply voltage monitoring means is a voltage detector. Drive power supply discharge control circuit. An AC servo driver comprising the AC servo driver drive power supply discharge control circuit according to claim 1.