CN104865867A - Reset method of reset circuit - Google Patents
Reset method of reset circuit Download PDFInfo
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- CN104865867A CN104865867A CN201510127457.3A CN201510127457A CN104865867A CN 104865867 A CN104865867 A CN 104865867A CN 201510127457 A CN201510127457 A CN 201510127457A CN 104865867 A CN104865867 A CN 104865867A
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- Prior art keywords
- reset circuit
- reset
- ipm
- over
- time
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
Abstract
The invention discloses a reset method of a reset circuit and belongs to the frequency conversion technical field. According to the reset method of the reset circuit, a frequency converter, a single-chip microcomputer reset circuit and an over-current detection circuit are adopted; the reset time of the single-chip microcomputer reset circuit is T1; time required by the over-current detection circuit to achieve a steady state after electrification is T0; and the reset time T1 of the single-chip microcomputer reset circuit is prolonged, so that T1 can be larger than or equal to T0. The reset time of the single-chip microcomputer reset circuit is prolonged, so that a phenomenon that the frequency converter cannot be started to work caused by false over-current which is caused by a situation in which an over-current port FO of an IPM continuously outputs low electric level before the IPM which has been electrified enters stable operation can be avoided.
Description
Technical field
The present invention relates to converter technique field, particularly the method for designing of frequency converter reset circuit of SCM.
Background technology
Frequency converter adopts single-chip microcomputer to produce the PWM ripple signal of 6 tunnel complementations to the break-make of control IPM or 6 IGBT, thus controls the operation of motor.At powered on moment, single-chip microcomputer enters reset according to the change of reset signal level, to bring into operation control program afterwards from reseting address.But; after monolithic processor resetting; when running control program; can constantly detect protection look-at-me, according to the situation of change of protection look-at-me level, control the generation of the PWM ripple signal of 6 tunnel complementations; when there being guard signal; single-chip microcomputer stops producing PWM ripple, shuts down the operation of motor, same to alarm.
Traditional reset circuit, generally according to monolithic processor resetting selection of time reset circuit parameter, does not consider the sequential of IPM over-current signal, usually causes the false overcurrent of IPM to report to the police, the technical matters that frequency converter cannot start at random occurs.
Summary of the invention
The object of the invention is for above-mentioned prior art, solve the false overcurrent of IPM and report to the police, the technical matters that frequency converter cannot start at random occurs, a kind of repositioning method of reset circuit is provided.
In order to reach above-mentioned technique effect, the present invention takes following technical scheme: a kind of repositioning method of reset circuit, comprises frequency converter, reset circuit of SCM and over-current detection circuit.The reset time of described reset circuit of SCM is T1, and reaching stable state required time after described over-current detection circuit powers on is T0; Extend T1 reset time of reset circuit of SCM, make T1 >=T0.
Further technical scheme is: described reset circuit of SCM is reset chip circuit or RC reset circuit, and described over-current detection circuit is made up of IPM or is made up of IGBT.
Further technical scheme is: the concrete grammar extending the reset time of reset circuit of SCM is, adopt RC reset circuit, RC reset circuit is in series by resistance R0 and electric capacity C0, namely the reset time of RC reset circuit is RC charging rate τ=R0C0=T1, and the value of resistance R0 and the product of electric capacity C0 value are more than or equal to after over-current detection circuit powers on and reach stable state required time T0.
Further technical scheme is: reach stable state required time TO=10ms after described over-current detection circuit powers on, the resistance R0=1k Ω of RC reset circuit, electric capacity C0=10uF.
Further technical scheme is: after described IPM powers on, its overcurrent output port FO stops output protection signal required time to be reach stable state required time T0 after over-current detection circuit powers on; IPM overcurrent output port FO signal is gathered by single-chip microcomputer; when the IPM overcurrent output port FO signal generation over-current signal moment; the PWM ripple of timely closedown single-chip microcomputer, stops IPM work.
Further technical scheme is: after IPM overcurrent output port FO over-current signal is removed, and after waiting for certain hour, again starts frequency converter work.Described certain hour is 3 minutes.
Further technical scheme is: arrange edge-triggered interrupt mode or low level triggered interrupts mode or high level triggered interrupts mode to IPM overcurrent output port FO, and configuration is corresponding interrupts protection service routine.
The present invention compared with prior art, there is following beneficial effect: by extending the monolithic processor resetting time, before entering steady operation after IPM can be avoided to power on, continue output low level because IPM crosses flow port FO, cause false overcurrent thus cause frequency converter cannot start the phenomenon generation of work.
Accompanying drawing explanation
Fig. 1 is RC reset circuit charging schematic diagram;
Fig. 2 is RC reset circuit charging sequential and IPM overcurrent output port FO time diagram.
Embodiment
Below in conjunction with embodiments of the invention, the invention will be further elaborated.
Embodiment:
The present embodiment adopts simple RC reset circuit, as shown in Figure 1,5V voltage is charged to electric capacity C0 by resistance R0, one end ground connection of electric capacity C0, the other end and Reset end connect monolithic processor resetting pin, when electric capacity C0 both end voltage reaches monolithic processor resetting level demand, monolithic processor resetting, to bring into operation control program from reseting address.The general monolithic processor resetting time (the T1 time as in Fig. 2) is very short, and IPM to set up stable work time longer than the monolithic processor resetting time, as shown in the T0 in Fig. 2.For this reason, set up steady operation required time T0 according to IPM especially, as the foundation of monolithic processor resetting time design, namely design the longer monolithic processor resetting time, avoid IPM to shut down the generation of phenomenon due to the spurious alarm do not set up stable work time and cause.
The present invention gives overall consideration to monolithic processor resetting time and IPM electrifying timing sequence, design alternative rational reset time.The general monolithic processor resetting time is at about 1 millisecond.But, IPM powers on instantaneous, because needs are to inner and peripheral devices charging, certain time interval T 0 (about 10 milliseconds) is needed to set up steady state (SS), as shown in Figure 2, during this period of time, because IPM overcurrent output port and FO port continue output low level, after IPM sets up steady-working state, IPM overcurrent output port FO just continues to export high level signal, afterwards, in the frequency converter course of work, when there is overcurrent in IPM, the automatic output low level signal of IPM overcurrent output port FO.Single-chip microprocessor MCU gathers IPM overcurrent output port FO signal, acquisition method has two kinds, one is according to IPM overcurrent output port FO low level signal, another kind is according to IPM overcurrent output port FO negative edge from high to low, in order to gather the situation of change of IPM overcurrent output port FO signal timely, single-chip microprocessor MCU usually adopts low level to interrupt or negative edge triggered interrupts mode, catch IPM overcurrent output port FO signal timely, when IPM overcurrent, the generation of timely stopping PWM ripple, stops IPM work.
After monolithic processor resetting, IPM does not also set up stable duty, the regular hour goes to detect FO signal to need to force single-chip microcomputer to be waited for, although this method also can avoid microprocessor detect to arrive false over-current signal, but the simplest method still extends monolithic processor resetting time T1, namely adopt the T2 in Fig. 2 as the reset time of single-chip microcomputer, T2>T0.Like this, work as monolithic processor resetting, after running relevant initial work; when preparing to detect IPM overcurrent output port FO signal; IPM duty is stablized, and IPM overcurrent output port FO signal has been stable high level, and the generation of spurious alarm halting problem can not occur.
For this reason, ad hoc meter monolithic processor resetting time T1>T0, general T1=10 millisecond of selecting can meet design requirement completely, and accurate design needs to measure T0 and monolithic processor resetting signal.Adopt simple R C charge reset circuit when, RC charging rate τ=R0C0, as adopted R0=1K, C=10uF, can reach requirement reset time of τ=10 millisecond.If need meticulous design, running initialize routine after special consideration monolithic processor resetting needs regular hour T3, so designs T1>=T0-T3 reset time, but in practical application, does not have reference value.
Be normally low level at IPM overcurrent output port FO signal, when overcurrent is high level, mentality of designing is applicable equally.Adopt the thinking of reset chip design reset circuit identical with adopting the thinking of RC circuit design reset chip; the present invention is not limited to adopt RC reset circuit; also be not limited to adopt IPM to design the occasion of frequency converter; in practical application, there is no IPM circuit, and when having other circuit; if after MCU has resetted; under other circuit also do not set up the condition of steady-working state, design philosophy of the present invention is applicable equally, also within protection domain.
A kind of reset circuit design method, comprises the steps:
A, according to single-chip microprocessor MCU reset time and IPM setting up the steady-working state time, with most elder for foundation, the design monolithic processor resetting time.
B, MCU complete initial work after resetting, and comprise and arrange edge-triggered or low level or high level (specifically selecting according to IPM) triggered interrupts mode to IPM over-current signal FO, and configuration is corresponding interrupts protection service routine.
C, when the IPM overcurrent output port FO signal generation over-current signal moment, in time close PWM ripple, stop IPM work.
D, after IPM over-current signal is removed, then after certain hour was as 3 minutes, again start frequency converter work.
The present invention surveys and sets up stable work time after IPM powers on is 10 milliseconds, adopt simple R C charging reset circuit, RC charging rate τ=R0C0, and adopt R0=1K, C=10uF, namely reach requirement reset time of τ=10 millisecond, solve after powering on and just report overcurrent fault at random, the technical matters of frequency converter work cannot be started.
Be understandable that, the illustrative embodiments that above embodiment is only used to principle of the present invention is described and adopts, but the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.
Claims (8)
1. a repositioning method for reset circuit, is characterized in that: comprise frequency converter, reset circuit of SCM and over-current detection circuit, and the reset time of described reset circuit of SCM is T1, and reaching stable state required time after described over-current detection circuit powers on is T0; Extend T1, make T1 >=T0.
2. the repositioning method of reset circuit according to claim 1, is characterized in that: described reset circuit of SCM is reset chip circuit or RC reset circuit, and described over-current detection circuit is made up of IPM or is made up of IGBT.
3. the repositioning method of reset circuit according to claim 2, it is characterized in that: the concrete grammar extending the reset time of reset circuit of SCM is, adopt RC reset circuit, RC reset circuit is in series by resistance (R0) and electric capacity (C0), namely the reset time of RC reset circuit is RC charging rate τ=R0C0=T1, and the value of resistance (R0) and the product of electric capacity (C0) value are more than or equal to after over-current detection circuit powers on and reach stable state required time (T0).
4. the repositioning method of reset circuit according to claim 3, is characterized in that: reach stable state required time TO=10ms after described over-current detection circuit powers on, the resistance R0=1k Ω of RC reset circuit, electric capacity C0=10uF.
5. the repositioning method of the reset circuit according to claim 3 or 4; it is characterized in that: after described IPM powers on, its overcurrent output port (FO) stops output protection signal required time to be reach stable state required time (T0) after over-current detection circuit powers on; IPM overcurrent output port (FO) signal is gathered by single-chip microcomputer; when IPM overcurrent output port (FO) the signal generation over-current signal moment; the PWM ripple of timely closedown single-chip microcomputer, stops IPM work.
6. the repositioning method of frequency converter reset circuit according to claim 5, is characterized in that: after IPM overcurrent output port (FO) over-current signal is removed, and after waiting for certain hour, again starts frequency converter work.
7. the repositioning method of frequency converter reset circuit according to claim 5; it is characterized in that: arrange edge-triggered interrupt mode or low level triggered interrupts mode or high level triggered interrupts mode to IPM overcurrent output port (FO), configuration is corresponding interrupts protection service routine.
8. the repositioning method of frequency converter reset circuit according to claim 6, is characterized in that: described certain hour is 3 minutes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510127457.3A CN104865867B (en) | 2015-03-23 | 2015-03-23 | A kind of repositioning method of reset circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510127457.3A CN104865867B (en) | 2015-03-23 | 2015-03-23 | A kind of repositioning method of reset circuit |
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| CN104865867A true CN104865867A (en) | 2015-08-26 |
| CN104865867B CN104865867B (en) | 2017-09-19 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101814728A (en) * | 2010-04-19 | 2010-08-25 | 南京航空航天大学 | Fault protection reset controlling system and method for large-power IGBT (Insulated Gate Bipolar Translator ) optical fiber driving circuit |
| CN102545139A (en) * | 2010-12-07 | 2012-07-04 | 鸿富锦精密工业（深圳）有限公司 | Overcurrent protection device |
| US20130314836A1 (en) * | 2012-05-24 | 2013-11-28 | Allegro Microsystems, Inc. | Transistor Overcurrent Detection |
| CN103545792A (en) * | 2013-08-22 | 2014-01-29 | 深圳市伟创电气有限公司 | ACS710 based frequency converter overcurrent protection circuit and method |
| CN104332945A (en) * | 2014-10-30 | 2015-02-04 | 深圳市汇川技术股份有限公司 | High-speed digital output circuit with overcurrent protection and integrated circuit |
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2015
- 2015-03-23 CN CN201510127457.3A patent/CN104865867B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101814728A (en) * | 2010-04-19 | 2010-08-25 | 南京航空航天大学 | Fault protection reset controlling system and method for large-power IGBT (Insulated Gate Bipolar Translator ) optical fiber driving circuit |
| CN102545139A (en) * | 2010-12-07 | 2012-07-04 | 鸿富锦精密工业（深圳）有限公司 | Overcurrent protection device |
| US20130314836A1 (en) * | 2012-05-24 | 2013-11-28 | Allegro Microsystems, Inc. | Transistor Overcurrent Detection |
| CN103545792A (en) * | 2013-08-22 | 2014-01-29 | 深圳市伟创电气有限公司 | ACS710 based frequency converter overcurrent protection circuit and method |
| CN104332945A (en) * | 2014-10-30 | 2015-02-04 | 深圳市汇川技术股份有限公司 | High-speed digital output circuit with overcurrent protection and integrated circuit |
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| CN104865867B (en) | 2017-09-19 |
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