A kind of high-power servo drive
Technical field
The utility model relates to a kind of high-power servo drive.
Background technology
High-power servo drive (more than 100KW) is the in demand high-end servo drives in automated production field such as present heavy digital control machine tool, forging machine tool.Therefore, in prior art in the urgent need to a kind of high-power servo drive that is suitable for driving the automated production equipments such as heavy digital control machine tool, forging machine tool.
The utility model content
In order to solve the problem of prior art, the utility model provides a kind of high-power servo drive, can realize driving the servomotor of heavy automated production equipment, and safe and reliable, stability is strong.
For achieving the above object, the utility model is taked following technical scheme:
A kind of high-power servo drive; comprise control circuit, current rectifying and wave filtering circuit and the braking circuit that is connected with current rectifying and wave filtering circuit; this device also comprises Drive Protecting Circuit, switch power device and output current detection circuit, and the switch power device is connected with braking circuit, wherein:
Control circuit is connected with Drive Protecting Circuit, sends drive control signal and this drive control signal is delivered to Drive Protecting Circuit;
The drive control signal that the Drive Protecting Circuit reception control circuit sends also converts this drive control signal to the differential driving signal, then the differential driving signal is carried out being sent to the switch power device after power amplification;
Output current detection circuit is connected with Drive Protecting Circuit, detects the current signal of the differential driving signal of Drive Protecting Circuit output, and the current signal that detects is fed back to Drive Protecting Circuit;
Drive Protecting Circuit receives the current signal of output current detection circuit feedback, when current signal surpasses default safe current threshold value, carries out delay protection and sends fault-signal to control circuit.
Preferably, Drive Protecting Circuit comprises over-current detection circuit, when this over-current detection circuit detects current signal and surpasses default safe current threshold value, produces the enabling signal of carrying out delay protection and sending fault-signal to control circuit.
Preferably; Drive Protecting Circuit also comprises cuts off device and integrator delay-time circuit; integrator delay-time circuit is connected with over-current detection circuit; integrator delay-time circuit starts the integration time-delay according to enabling signal; send the first shutoff signal and send fault-signal to control circuit to cutting off device when delay time arrives, cut off device and cut off the output of differential driving signal according to the first shutoff signal.
Preferably; Drive Protecting Circuit also comprises the pressure differential detection circuit; the pressure differential detection circuit is connected with the cut-out device with the switch power device respectively; the conduction voltage drop during conducting of sense switch power device; when conduction voltage drop surpasses default shutter limit value; send the second shutoff signal to cutting off device, cut off device and cut off the output of differential driving signal according to the second shutoff signal.
Preferably; Drive Protecting Circuit comprises that also driving signal enables control circuit; after the cut-out device receives the first shutoff signal and/or the second shutoff signal; enable control circuit transmission stop signal to driving signal; driving signal enables to stop the transmission of differential driving signal after control circuit receives this stop signal.
Preferably; Drive Protecting Circuit also comprises amplifying circuit; amplifying circuit enables control circuit with the driving signal and is connected; after the cut-out device receives the first shutoff signal and/or the second shutoff signal; send stop signal to amplifying circuit; after amplifying circuit receives this stop signal, stop the amplification of differential driving signal.
Preferably, the switch power device comprises the monomer insulated gate bipolar transistor IGBT of at least four parallel connections.
Preferably, the device in each circuit has sequentially by copper bar and couples together.
The utility model is owing to taking above-described technical scheme, and compared with prior art, it comprises following advantage: safe and reliable, stability is strong, and mechanical strength is high, is suitable for the driving of the automated production equipments such as heavy digital control machine tool, forging machine tool.
Description of drawings
Fig. 1 is the circuit theory diagrams of high-power servo drive of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described further.
As shown in Figure 1; in the application's a execution mode; a kind of high-power servo drive; comprise control circuit, current rectifying and wave filtering circuit and the braking circuit that is connected with current rectifying and wave filtering circuit; this high-power servo drive also comprises Drive Protecting Circuit, switch power device and output current detection circuit; the switch power device is connected with braking circuit, wherein:
Control circuit is connected with Drive Protecting Circuit, sends drive control signal and this drive control signal is delivered to Drive Protecting Circuit.
The drive control signal that the Drive Protecting Circuit reception control circuit sends also converts this drive control signal to the differential driving signal, then the differential driving signal is carried out being sent to the switch power device after power amplification.
Output current detection circuit is connected with Drive Protecting Circuit, detects the current signal of the differential driving signal of Drive Protecting Circuit output, and the current signal that detects is fed back to Drive Protecting Circuit.
Drive Protecting Circuit receives the current signal of output current detection circuit feedback, when current signal surpasses default safe current threshold value, carries out delay protection and sends fault-signal to control circuit.
Selectively; in the application's embodiment; Drive Protecting Circuit can comprise over-current detection circuit, when this over-current detection circuit can detect current signal and surpasses default safe current threshold value, produces the enabling signal of carrying out delay protection and sending fault-signal to control circuit.
Selectively; in the application's embodiment; Drive Protecting Circuit can also comprise cuts off device and integrator delay-time circuit; integrator delay-time circuit can be connected with over-current detection circuit; integrator delay-time circuit starts the integration time-delay according to enabling signal; can send the first shutoff signal and send fault-signal to control circuit to cutting off device when delay time arrives, cut off device and can cut off according to the first shutoff signal the output of differential driving signal.
Selectively; in the application's embodiment; Drive Protecting Circuit can also comprise the pressure differential detection circuit; the pressure differential detection circuit can be connected with the cut-out device with the switch power device respectively; the conduction voltage drop during conducting of sense switch power device; when conduction voltage drop surpasses default shutter limit value, can send the second shutoff signal to cutting off device, cut off device and can cut off according to the second shutoff signal the output of differential driving signal.
Selectively; in the application's embodiment; Drive Protecting Circuit can also comprise that driving signal enables control circuit; after the cut-out device receives the first shutoff signal and/or the second shutoff signal; can enable control circuit transmission stop signal to driving signal; driving signal enables can stop the transmission of differential driving signal after control circuit receives this stop signal.
Selectively; in the application's embodiment; Drive Protecting Circuit can also comprise amplifying circuit; amplifying circuit can enable control circuit with the driving signal and be connected; after the cut-out device receives the first shutoff signal and/or the second shutoff signal; can send stop signal to amplifying circuit, after amplifying circuit receives this stop signal, can stop the amplification of differential driving signal.
Selectively, in the application's embodiment, the switch power device can comprise the monomer insulated gate bipolar transistor IGBT of at least four parallel connections.Because monomer I GBT electric current is limited, at least four the monomer I GBT parallel connection in the present embodiment can reach the needs of high-power output current.
In the application's embodiment, mechanical structure layout aspect can be with the necessary device in circuit, such as, power supply input rectifying device, buffering device, reactor, filter capacitor, inverter power device, high order harmonic component absorb device, control device etc. and are linked in sequence by copper bar, simultaneously screen and low inductance conductive plate can be installed, interfere with each other problem when effectively solving large electric current I GBT parallel connection.
In the application's embodiment, the operating power of this servo drive can be 300 kilowatts, and when realizing, operating power can also be larger.
Obviously, those skilled in the art deliberately carries out various changes and modification and does not break away from spirit and scope of the present utility model the utility model.Like this, if within of the present utility model these are revised and modification belongs to the scope of the utility model claim and equivalent technologies thereof, the utility model also is intended to comprise these changes and modification interior.