CN201413978Y - AC servo drive circuit - Google Patents
AC servo drive circuit Download PDFInfo
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- CN201413978Y CN201413978Y CN2009201086593U CN200920108659U CN201413978Y CN 201413978 Y CN201413978 Y CN 201413978Y CN 2009201086593 U CN2009201086593 U CN 2009201086593U CN 200920108659 U CN200920108659 U CN 200920108659U CN 201413978 Y CN201413978 Y CN 201413978Y
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Abstract
The utility model discloses an AC servo drive circuit for lowering the circuit cost. The circuit comprises a drive protection circuit and a switch power device. The drive protection circuit can be used in the following three aspects: converting a pulse width modulation logic signal transmitted by a control circuit into a differential drive signal, amplifying the differential drive signal and transmitting the amplified signal to a switch power device; receiving a current signal fed back by an output current detection circuit, executing delay protection when the current signal has overcurrent, and transmitting a fault signal to the control circuit; detecting the conduction voltage drop of the switch power device in the on-state, and cutting off the output of the differential drive signal when the conduction voltage drop exceeds a preset protection threshold. The switch power device is used for transmitting an output current to the output current detection circuit according to the amplified differential drive signal to achieve power output. Compared with the prior art, the novel AC servo drive circuit provided by the utility model can lower the cost of the AC servo drive circuit.
Description
Technical field
The utility model relates to a kind of drive circuit, relates in particular to a kind of AC servo drive circuit.
Background technology
The AC servo drive circuit is the common circuit of various fields such as present automated production.The switch power device is one of important component part of AC servo drive circuit, costs an arm and a leg and damage easily, and is particularly important when selecting for use and protect.
In the existing AC servo drive circuit, the switch power device select for use mostly Intelligent Power Module (Intelligent Power Module, IPM).At present, IPM generally needs import, and cost is higher on the whole to make the AC servo drive circuit.
Therefore be necessary prior art is improved, to reduce the Financial cost of existing AC servo drive circuit.
The utility model content
Technical problem to be solved in the utility model is to be to provide a kind of AC servo drive circuit, to reduce the cost of existing AC servo drive circuit.
In order to solve the problems of the technologies described above, the utility model provides a kind of AC servo drive circuit, comprises control circuit, Drive Protecting Circuit, switch power device and output current detection circuit, wherein:
Described Drive Protecting Circuit, link to each other with described control circuit, switch power device and output current detection circuit, the pulse-width modulation logical signal that described control circuit is sent becomes the differential driving signal, sends to described switch power device after described differential driving signal is amplified; Receive the current signal of described output current detection circuit feedback, carry out delay protection during described current signal overcurrent, send fault-signal to described control circuit; Conduction voltage drop when detecting described switch power break-over of device when described conduction voltage drop surpasses default shutter limit value, cuts off the output of described differential driving signal;
Described switch power device according to the differential driving signal after the described amplification, sends output current to described output current detection circuit, finishes power output.
Preferably, described Drive Protecting Circuit comprises that difference channel, drive signal enable control circuit, amplifying circuit, over-current detection circuit, integrator delay-time circuit, pressure differential detection circuit and cut off device, wherein:
Difference channel becomes described differential driving signal with described pulse-width modulation logical signal;
Drive signal enables control circuit, links to each other with described difference channel, under the control of described cut-out device, described differential driving signal is sent to described amplifying circuit, receive the stop signal that described cut-out device sends after, stop to send described differential driving signal;
Amplifying circuit enables control circuit with described drive signal and links to each other, and amplifies described differential driving signal, sends to described switch power device; Stop to amplify described differential driving signal after receiving the stop signal that described cut-out device sends, send control voltage and close described switch power device;
Over-current detection circuit links to each other with described output current detection circuit, receives described current signal, when described current signal surpasses default safe current threshold value, produces enabling signal;
Integrator delay-time circuit links to each other with described over-current detection circuit, starts the integration time-delay according to described enabling signal, sends shutoff signal to described cut-out device when delay time arrives, and sends described fault-signal to described control circuit;
The pressure differential detection circuit with described switch power device and cut off device and link to each other, detects described conduction voltage drop, when described conduction voltage drop surpasses described shutter limit value, to described cut-out device transmission shutoff signal;
Cut off device, enable control circuit and amplifying circuit sends described stop signal to described drive signal according to described shutoff signal.
Preferably, described switch power device is an insulated gate bipolar transistor.
Compared with prior art, the utility model passes through to adopt insulated gate bipolar transistor as the switch power device, thereby has proposed a kind of novel AC servo drive circuit, has reduced the realization cost of AC servo drive circuit.
Description of drawings
Fig. 1 is an embodiment of the utility model AC servo drive circuit.
Fig. 2 is the composition schematic diagram of above-mentioned Drive Protecting Circuit.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, the utility model is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is an embodiment of the utility model AC servo drive circuit.As shown in Figure 1, the AC servo drive circuit among this embodiment comprises power supply 110, control circuit 120, Drive Protecting Circuit 130, switch power device 140 and output current detection circuit 150, wherein:
Power supply 110 links to each other with control circuit 120, Drive Protecting Circuit 130 and switch power device 140, for control circuit 120, Drive Protecting Circuit 130 and switch power device 140 provide electric energy;
Control circuit 120, link to each other with power supply 110 and Drive Protecting Circuit 130, send pulse-width modulation (PWM) logical signal to Drive Protecting Circuit 130, and the fault-signal of reception Drive Protecting Circuit 130 feedbacks, stop when breaking down sending the pulse-width modulation logical signal, and make control system enter the safeguard protection state;
Drive Protecting Circuit 130, link to each other with power supply 110, control circuit 120 and switch power device 140, behind the PWM logical signal that reception control circuit 120 sends, the PWM logical signal is become differential driving signal (being a PWM drive signal), realize that the error protection of PWM logical signal is (such as bridge about causing same brachium pontis owing to program error, hardware fault, strong jamming etc. is misleaded simultaneously, can realize the error protection of PWM logical signal this moment), then this differential driving signal is amplified, remove control switch power device 140; Receive the current signal that output current detection circuit 150 is fed back in real time, judge whether this output current is in overcurrent condition, if then according to the overcurrent degree, or carry out delay protection soon or slowly and (adopt protection fast when overcurrent is serious, adopt slower delay protection when not serious), send fault-signal during protection to control circuit 120; Conduction voltage drop during 140 conductings of sense switch power device (has conduction voltage drop during the IGBT conducting, general 1.7V-3V, pressure drop rises to a certain degree (generally surpass 5V) and thinks overcurrent or short circuit during conducting), when this conduction voltage drop surpasses default shutter limit value, cut off the output of differential driving signal, send fault-signal simultaneously to control circuit 120;
Output current detection circuit 150 links to each other with Drive Protecting Circuit 130 and switch power device 140, and sense switch power device 140 is exported to the output current of motor, and feeds back these current signals according to this output current to Drive Protecting Circuit 130; Lead-in wire breaks down or PWM logical signal when situation such as making a mistake between motor windings turn-to-turn short circuit, motor rotation blockage, AC servo driver and motor; moment becomes big heavy current and probably causes device failure, therefore needs this current signal is fed back to Drive Protecting Circuit 130.
By embodiment shown in Figure 1 as can be known, the utility model adopts insulated gate bipolar transistor as the switch power device, has proposed a kind of novel AC servo drive circuit, has reduced the realization cost of AC servo drive circuit.
Fig. 2 is the composition schematic diagram of above-mentioned Drive Protecting Circuit 130.In conjunction with the utility model embodiment shown in Figure 1; as shown in Figure 2; above-mentioned Drive Protecting Circuit 130 comprises that mainly difference channel 231, drive signal enable control circuit 232, amplifying circuit 233, over-current detection circuit 234, integrator delay-time circuit 235, pressure differential detection circuit 236 and cut off device 237, wherein:
Drive signal enables control circuit 232, links to each other with difference channel 231, amplifying circuit 233 and cut-out device 237, whether the differential driving signal is sent to amplifying circuit 233 according to the signal controlling of cutting off device 237;
Amplifying circuit 233 enables control circuit 232, cut-out device 237 and switch power device 140 with drive signal and links to each other, and amplifies drive signal and enables the differential driving signal that control circuit 232 is transmitted, and removes control switch power device 140 then; Stop to amplify the differential driving signal after receiving the stop signal of cutting off device 237 transmissions, send control voltage and come off switch power device 140;
Over-current detection circuit 234, link to each other with output current detection circuit 150, receive the current signal of output current detection circuit 150 feedbacks,, produce an enabling signal and send to integrator delay-time circuit 235 if when this current signal surpasses a default safe current threshold value;
Integrator delay-time circuit 235, link to each other with over-current detection circuit 234, cut-out device 237 and control circuit 120, the enabling signal that sends according to over-current detection circuit 234 starts the integration time-delay, when delay time arrives, send shutoff signal, and send fault-signal to control circuit 120 to cutting off device 237;
Pressure differential detection circuit 236 links to each other with switch power device 140 and cut-out device 237, and the conduction voltage drop the during conducting of sense switch power device when this conduction voltage drop surpasses default shutter limit value, produces a shutoff signal and transmission to cut-out device 237;
Cut off device 237, link to each other with pressure differential detection circuit 236 and integrator delay-time circuit 235, also enabling control circuit 232 with drive signal links to each other with amplifying circuit 233, shutoff signal according to pressure differential detection circuit 236 or integrator delay-time circuit 235 transmissions, enable control circuit 232 and amplifying circuit 233 transmission stop signals to drive signal, to cut off the output of differential driving signal, send control voltage simultaneously and come off switch power device 140.
Because hardware connects or strong jamming etc. is when causing PWM logic error, very easily damage switch power device 140, employing difference channel 231 becomes the PWM logical signal after the differential driving signal, can not improve antijamming capability simultaneously because of PWM logic error causes opening the brachium pontis short circuit that causes simultaneously with switch power device about the brachium pontis yet.Can suppress misleading of IGBT that common mode interference signal causes because become the differential driving signal, also because the positive and negative variation of differential driving signal just in time is added in on brachium pontis two IGBT, so can avoid conducting simultaneously being arranged and the short circuit that causes may with brachium pontis two IGBT.
Above-mentioned integrator delay-time circuit 235 has reduced because interference waits and has caused the influence of the misoperation of circuit to current signal, takes different delay time length with the difference of overcurrent amplitude simultaneously, and overcurrent amplitude greatly then delay time is short, and protection is moved faster.
Need to prove that the protection process that above-mentioned pressure differential detection circuit 236, over-current detection circuit 234 and integrator delay-time circuit 235 are realized makes these two kinds of protected mode protections accurately without control board (MCU), protection speed is fast.
Though the disclosed execution mode of the utility model as above, the execution mode that described content just adopts for the ease of understanding the utility model is not in order to limit the utility model.Technical staff under any the utility model in the technical field; under the prerequisite that does not break away from the disclosed spirit and scope of the utility model; can do any modification and variation what implement in form and on the details; but scope of patent protection of the present utility model still must be as the criterion with the scope that appending claims was defined.
Claims (3)
1, a kind of AC servo drive circuit comprises control circuit, Drive Protecting Circuit, switch power device and output current detection circuit, it is characterized in that:
Described Drive Protecting Circuit, link to each other with described control circuit, switch power device and output current detection circuit, the pulse-width modulation logical signal that described control circuit is sent becomes the differential driving signal, sends to described switch power device after described differential driving signal is amplified; Receive the current signal of described output current detection circuit feedback, carry out delay protection during described current signal overcurrent, send fault-signal to described control circuit; Conduction voltage drop when detecting described switch power break-over of device when described conduction voltage drop surpasses default shutter limit value, cuts off the output of described differential driving signal;
Described switch power device according to the differential driving signal after the described amplification, sends output current to described output current detection circuit, finishes power output.
2, AC servo drive circuit as claimed in claim 1; it is characterized in that; described Drive Protecting Circuit comprises that difference channel, drive signal enable control circuit, amplifying circuit, over-current detection circuit, integrator delay-time circuit, pressure differential detection circuit and cut off device, wherein:
Difference channel becomes described differential driving signal with described pulse-width modulation logical signal;
Drive signal enables control circuit, links to each other with described difference channel, under the control of described cut-out device, described differential driving signal is sent to described amplifying circuit, receive the stop signal that described cut-out device sends after, stop to send described differential driving signal;
Amplifying circuit enables control circuit with described drive signal and links to each other, and amplifies described differential driving signal, sends to described switch power device; Stop to amplify described differential driving signal after receiving the stop signal that described cut-out device sends, send control voltage and close described switch power device;
Over-current detection circuit links to each other with described output current detection circuit, receives described current signal, when described current signal surpasses default safe current threshold value, produces enabling signal;
Integrator delay-time circuit links to each other with described over-current detection circuit, starts the integration time-delay according to described enabling signal, sends shutoff signal to described cut-out device when delay time arrives, and sends described fault-signal to described control circuit;
The pressure differential detection circuit with described switch power device and cut off device and link to each other, detects described conduction voltage drop, when described conduction voltage drop surpasses described shutter limit value, to described cut-out device transmission shutoff signal;
Cut off device, enable control circuit and amplifying circuit sends described stop signal to described drive signal according to described shutoff signal.
3, AC servo drive circuit as claimed in claim 1 is characterized in that:
Described switch power device is an insulated gate bipolar transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201086593U CN201413978Y (en) | 2009-05-31 | 2009-05-31 | AC servo drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201086593U CN201413978Y (en) | 2009-05-31 | 2009-05-31 | AC servo drive circuit |
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| Publication Number | Publication Date |
|---|---|
| CN201413978Y true CN201413978Y (en) | 2010-02-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201086593U Expired - Fee Related CN201413978Y (en) | 2009-05-31 | 2009-05-31 | AC servo drive circuit |
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| CN (1) | CN201413978Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118300582A (en) * | 2024-03-30 | 2024-07-05 | 海信家电集团股份有限公司 | IPM, current protection method thereof and IPM control system |
-
2009
- 2009-05-31 CN CN2009201086593U patent/CN201413978Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118300582A (en) * | 2024-03-30 | 2024-07-05 | 海信家电集团股份有限公司 | IPM, current protection method thereof and IPM control system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: BEIJING CTB SERVO TECHNOLOGY CO., LTD. Free format text: FORMER NAME: BEIJING BEICHAO SERVO TECHNIQUES CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 101500 Beijing city Miyun ten Li Bao Zhen Wang Ge Zhuang Village West 200 meters Patentee after: BEIJING CHAOTONGBU SERVO CO., LTD. Address before: 101500 Beijing city Miyun ten Li Bao Zhen Wang Ge Zhuang Village West 200 meters Patentee before: Beijing Beichao Servo Techniques Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100224 Termination date: 20180531 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |