CN203859066U - Naesthesia machine power relay capacitive load contact protection circuit - Google Patents
Naesthesia machine power relay capacitive load contact protection circuit Download PDFInfo
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- CN203859066U CN203859066U CN201420092401.XU CN201420092401U CN203859066U CN 203859066 U CN203859066 U CN 203859066U CN 201420092401 U CN201420092401 U CN 201420092401U CN 203859066 U CN203859066 U CN 203859066U
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- 238000007493 shaping process Methods 0.000 claims abstract description 22
- 230000003139 buffering effect Effects 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 206010002091 Anaesthesia Diseases 0.000 claims description 15
- 230000037005 anaesthesia Effects 0.000 claims description 15
- 230000001681 protective effect Effects 0.000 claims 5
- 239000003990 capacitor Substances 0.000 description 9
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Abstract
The utility model provides a naesthesia machine power relay capacitive load contact protection circuit. The naesthesia machine power relay capacitive load contact protection circuit comprises a level conversion module used for receiving a first pulse signal and carrying out level conversion on the first pulse signal to generate a second pulse signal, a pulse shaping module which is connected with the level conversion module and is used for acquiring the second pulse signal and shaping the second pulse signal into a driving signal, an output buffer driving module which is connected with the pulse shaping module, is used for receiving the driving signal, supplies power for a relay after successful driving and realizes current buffering after successful driving, and a time-delay output control module which is used for receiving the first pulse signal and carrying out time-delay output control on the relay according to the first pulse signal. Through the protection circuit, disadvantages of the relay are settled, the conduction current of the relay during instant conduction can be greatly reduced, contact adhesion is avoided, and service life of the relay is improved.
Description
Technical field
The utility model relates to circuit field, relates in particular to a kind of contact protection circuit of Anesthesia machine power relay capacitive load.
Background technology
Along with the development of electronic technology, on Anesthesia machine, power supply and power switch circuit mainly contain following several implementation: (1) relay switch, (2) power P MOS control, (3) positive-negative-positive pliotron, (4) solid-state relay.Above-mentioned implementation respectively has pluses and minuses separately:
(1) relay switch, advantage is that through-current capacity is large, and operating voltage is high, and conduction voltage drop is little, and shortcoming is the contact adhesion sparking problem that switch speed exists fatal capacitive load slowly;
(2) power P MOS controls, and advantage is that switch speed is fast, low-power consumption, and shortcoming is that in the high situation of operating voltage, conducting resistance also can increase thereupon;
(3) positive-negative-positive pliotron, advantage is that switch speed is fast, and shortcoming is that drive current requirement is high, and drive level is high, and extra power consumption is large;
(4) solid-state relay, advantage is to be applicable to high-voltage great-current, and shortcoming is that volume is large, and cost is high and extra power consumption is large.
Therefore,, according to as above all types of features, on Anesthesia machine, special high-power place mainly adopts relay mode, but according to the operating characteristic of relay, can be excessive because of the On current of relay conducting moment, and easy capacitive load contact adhesion, reduced the useful life of relay.And for this problem, effective solution is not yet proposed at present.
Utility model content
The utility model is intended at least one of solve the problems of the technologies described above.
For this reason; the purpose of this utility model is to propose a kind of contact protection circuit of Anesthesia machine power relay capacitive load, to solve and to make up the defect of relay, can greatly reduce the relay conducting On current of moment; avoid contact adhesion, improved the useful life of relay.
To achieve these goals, the contact protection circuit of the Anesthesia machine power relay capacitive load of the utility model embodiment comprises: level switch module, be used for receiving the first pulse signal, and described the first pulse signal is carried out to level conversion, to generate the second pulse signal; Shaping pulse module, is connected with described level switch module, for obtaining described the second pulse signal, and described the second pulse signal is shaped as to driving signal; Output buffering driver module, is connected with described shaping pulse module, for receiving described driving signal, and is described relay power supply after driving successfully, and when driving successfully, electric current is cushioned; And time delay output control module, for receiving described the first pulse signal, and according to described the first pulse signal, described relay is carried out to time delay output and control.
In an embodiment of the present utility model, described level switch module further comprises: the first resistance; The first triode, the base stage of described the first triode is connected with the signal source of described the first pulse signal by described the first resistance, the grounded emitter of described the first triode; The second resistance, one end of described the second resistance is connected with the collector electrode of described the first triode; The 3rd resistance, one end of described the 3rd resistance is connected with the other end of described the second resistance, and the other end of described the 3rd resistance is connected with the first default power supply; Described the second triode, the base stage of described the second triode is connected with the other end of described the second resistance and one end of described the 3rd resistance, and emitter is connected with the described first default power supply, and collector electrode is connected with described shaping pulse module; The 4th resistance, one end of described the 4th resistance is connected with the collector electrode of described the second triode, other end ground connection.
In an embodiment of the present utility model, described shaping pulse module further comprises: the first electric capacity, and one end of described the first electric capacity is connected with described level switch module; The 5th resistance, one end of described the 5th resistance is connected with the other end of described the first electric capacity; The 6th resistance, one end of described the 6th resistance is connected with described level switch module, and the other end is connected with described the 5th resistance; The 7th resistance, one end of described the 7th resistance is connected with the other end of described the 6th resistance with the other end of described the 5th resistance, the other end ground connection of described the 7th resistance; The 8th resistance; And the 3rd triode, the base stage of described the 3rd triode is connected with one end of the other end of described the 5th resistance, the other end of described the 6th resistance and described the 7th resistance, emitter is by described the 8th grounding through resistance, and collector electrode is connected with described output buffering driver module.
In an embodiment of the present utility model, described output buffering driver module further comprises: switching tube, and the grid of described switching tube is connected with described level switch module, and source electrode is connected with the described first default power supply, and drain electrode is connected with described relay; The 9th resistance, the two ends of described the 9th resistance are connected with source electrode with the grid of described switching tube respectively; And second electric capacity, the two ends of described the second electric capacity are connected with source electrode with the grid of described switching tube respectively.
In an embodiment of the present utility model, described time delay output control module further comprises: the tenth resistance; The 3rd electric capacity; Control chip, the first end of described control chip, the second end and the 6th end ground connection, the 3rd end is connected with described relay, the 4th end is connected with the signal source of described the first pulse signal by described the tenth resistance, five terminal is by described the 3rd capacity earth, the 7th end is idle, and the 8th end is connected with the second default power supply; The 11 resistance; Diode, the positive terminal of described diode is connected with the 4th end of described control chip by described the 11 resistance, and negative pole end is connected with the signal source of described the first pulse signal; The 4th electric capacity, one end of described the 4th electric capacity is connected with the 4th end of described control chip, other end ground connection.
In an embodiment of the present utility model, the described driving signal by described shaping pulse module carries out soft start to described output buffering driver module, and wherein, the time of soft start is the very first time; By described output buffering driver module, be that the time that described relay is powered was the second time, wherein, the described very first time is less than described the second time; The time delay control time of described time delay output control module was the 3rd time, and wherein, described the 3rd time is less than described the second time, and is greater than the described very first time.
According to the contact protection circuit of the Anesthesia machine power relay capacitive load of the utility model embodiment; by output, cushion driver module soft starting circuit; can cushion the impact of large electric current to circuit capacitance in relay moment of powering, thereby avoid capacitive load contact adhesion.In addition, by shaping pulse module and time delay output control module, intersect control circuit, thereby when avoiding capacitive load contact adhesion, solved extra power consumption that PMOS switch long-term power supply causes and overheated problem.
The aspect that the utility model is additional and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present utility model.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the utility model and advantage will become from the following description of the accompanying drawings of embodiments and obviously and easily understand, wherein,
Fig. 1 is according to the structured flowchart of the contact protection circuit of the Anesthesia machine power relay capacitive load of an embodiment of the utility model;
Fig. 2 is according to the schematic diagram of the contact protection circuit of the Anesthesia machine power relay capacitive load of an embodiment of the utility model.
Embodiment
Describe embodiment of the present utility model below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Below by the embodiment being described with reference to the drawings, be exemplary, only for explaining the utility model, and can not be interpreted as restriction of the present utility model.On the contrary, embodiment of the present utility model comprises spirit and all changes within the scope of intension, modification and the equivalent that falls into additional claims.
In description of the present utility model, it will be appreciated that, term " first ", " second " etc. are only for describing object, and can not be interpreted as indication or hint relative importance.In description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, term " is connected ", " connection " should be interpreted broadly, and for example, can be to be fixedly connected with, and can be also to removably connect, or connects integratedly; Can be mechanical connection, can be to be also electrically connected to; Can be to be directly connected, also can indirectly be connected by intermediary.For the ordinary skill in the art, can concrete condition understand the concrete meaning of above-mentioned term in the utility model.In addition,, in description of the present utility model, except as otherwise noted, the implication of " a plurality of " is two or more.
In flow chart or any process of otherwise describing at this or method describe and can be understood to, represent to comprise that one or more is for realizing the module of code of executable instruction of the step of specific logical function or process, fragment or part, and the scope of preferred implementation of the present utility model comprises other realization, wherein can be not according to order shown or that discuss, comprise according to related function by the mode of basic while or by contrary order, carry out function, this should be understood by embodiment person of ordinary skill in the field of the present utility model.
Below with reference to accompanying drawing, describe according to the contact protection circuit of the Anesthesia machine power relay capacitive load of the utility model embodiment.
Fig. 1 is according to the structured flowchart of the contact protection circuit of the Anesthesia machine power relay capacitive load of an embodiment of the utility model.Fig. 2 is according to the schematic diagram of the contact protection circuit of the Anesthesia machine power relay capacitive load of an embodiment of the utility model.
As shown in Figure 1, the contact protection circuit of Anesthesia machine power relay capacitive load comprises: level switch module 10, shaping pulse module 20, output buffering driver module 30 and time delay output control module 40.
Particularly, level switch module 10 is for receiving the first pulse signal, and the first pulse signal is carried out to level conversion, to generate the second pulse signal.More specifically, as shown in Figure 2, level switch module 10 further comprises the first resistance R 1, the first triode Q1, the second resistance R 2, the 3rd resistance R 3, the second triode Q2 and the 4th resistance R 4.Wherein, the base stage of the first triode Q1 is by the signal source MCU(Micro Control Unit of the first resistance R 1 and the first pulse signal, micro-control unit) be connected, to receive the first pulse signal, the grounded emitter of the first triode Q1; One end of the second resistance R 2 is connected with the collector electrode of the first triode Q1; One end of the 3rd resistance R 3 is connected with the other end of the second resistance, and the other end of the 3rd resistance is connected with the first default power supply; The base stage of the second triode Q2 is connected with the other end of the second resistance R 2 and one end of the 3rd resistance R 3, and emitter is connected with the first default power supply, and collector electrode is connected with shaping pulse module 20; One end of the 4th resistance R 4 is connected with the collector electrode of the second triode Q2, other end ground connection.
Thus, formed can be to carrying out the level switch module 10 of level conversion from the first pulse signal Pulse of MCU for R1, Q1, R2, R3, Q2 and R4.In an embodiment of the present utility model, the desirable 0/3～5.5V of level of MCU, the level range after changing is 0/VCC.
Shaping pulse module 20 is connected with level switch module, for obtaining the second pulse signal, and the second pulse signal is shaped as to driving signal.More specifically, as shown in Figure 2, shaping pulse module 20 further comprises: the first capacitor C 1, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8 and the 3rd triode Q3.Wherein, one end of the first capacitor C 1 is connected with level switch module 10; One end of the 5th resistance R 5 is connected with the other end of the first capacitor C 1; One end of the 6th resistance R 6 is connected with level switch module 10, and the other end is connected with the 5th resistance R 5; One end of the 7th resistance R 7 is connected with the other end of the 6th resistance R 6 with the other end of the 5th resistance R 5, the other end ground connection of the 7th resistance R 7; The base stage of the 3rd triode Q3 is connected with one end of the other end of the 5th resistance R 5, the other end of the 6th resistance R 6 and the 7th resistance R 7, and emitter is by the 8th resistance R 8 ground connection, and collector electrode is connected with output buffering driver module 30.
Output buffering driver module 30 is connected with shaping pulse module, is connected with shaping pulse module, for receiving driving signal, and is relay power supply after driving successfully, and when driving successfully, electric current is cushioned.More specifically, as shown in Figure 2, output buffering driver module 30 further comprises: switching tube Q4, the 9th resistance R 9 and the second capacitor C 2.Wherein, the grid of switching tube Q4 is connected with level switch module 20, and source electrode is connected with the first default power supply, and drain electrode is connected with relay; The two ends of the 9th resistance R 9 are connected with source electrode with the grid of switching tube Q4 respectively; The two ends of the second capacitor C 3 are connected with source electrode with the grid of switching tube Q4 respectively.
In an embodiment of the present utility model, switching tube Q4 can be power P OMS pipe, the shaping pulse module 20 being comprised of C1, R5, R6, R7, R8 and Q3 can be shaped as the second pulse signal the driving signal that drives rear class power P MOS switching tube, so that the power P MOS switching tube soft start in output buffer module 30.Wherein, the circuit parameter of soft start is 44ms.This stage is that circuit is initial at the high level signal rising edge from MCU, and the process very first time t1=44ms time is to late-class circuit soft start-up process.When switching tube Q4 opens moment, R9 and C2 can prevent its unlatching impulse current of moment.After switching tube Q4 opens, late-class circuit can be opened power supply by Q4 as electronic switch the short time.The second time t2=88ms of voltage stabilization settling time.Wherein, very first time t1 and the second time t2 be by Q4, C1, R5, R6, R7, R8, and C2 and R9 determine jointly, and very first time t1< the second time t2.
Time delay output control module 40 is for receiving the first pulse signal, and according to the first pulse signal, relay carried out to time delay output and control.More specifically, as shown in Figure 2.Time delay output control module 40 further comprises: the tenth resistance R 10, the 3rd capacitor C 3, control chip U1, the 11 resistance R 11, diode D1, the 4th capacitor C 4.Wherein, the first end of control chip U1, the second end and the 6th end ground connection, the 3rd end is connected with relay, the 4th end is connected with the signal source of the first pulse signal by the tenth resistance R 10, five terminal is by the 3rd capacitor C 3 ground connection, and the 7th end is idle, and the 8th end is connected with the second default power supply; The positive terminal of diode D1 is connected with the 4th end of control chip U1 by the 11 resistance R 11, and negative pole end is connected with the signal source of the first pulse signal; One end of the 4th capacitor C 4 is connected with the 4th end of control chip U1, other end ground connection.By R10, C3, U1, R11, D1, C4, jointly formed the delay control circuit of relay, wherein, can calculate the 3rd time, i.e. delay time by following formula:
T3=0.7*R10*C4, wherein, t1<t3<t2.
In an embodiment of the present utility model, the very first time t1 stage is the stabilization time of power P MOS switching tube power supply, relay is closed condition during this period, it in the 3rd time t3 stage, is the open time delay time of relay, can effectively avoid late-class circuit electric capacity at the relay heavy current impact at power supply initial stage, after the second time t2 stage, the power supply of power P MOS switching tube is cut off automatically, late-class circuit is all powered by relay, whole process has met impact that relay is not subject to initially to open large electric current and has also met PMOS and open for a long time extra power consumption and the problems of excessive heat that power supply causes.
According to the contact protection circuit of the Anesthesia machine power relay capacitive load of the utility model embodiment; by output, cushion driver module soft starting circuit; can cushion the impact of large electric current to circuit capacitance in relay moment of powering, thereby avoid capacitive load contact adhesion.In addition, by shaping pulse module and time delay output control module, intersect control circuit, thereby when avoiding capacitive load contact adhesion, solved extra power consumption that PMOS switch long-term power supply causes and overheated problem.
In the description of this specification, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present utility model or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or feature can be with suitable mode combinations in any one or more embodiment or example.
Although illustrated and described embodiment of the present utility model, those having ordinary skill in the art will appreciate that: in the situation that not departing from principle of the present utility model and aim, can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present utility model is limited by claim and equivalent thereof.
Claims (6)
1. a contact protection circuit for Anesthesia machine power relay capacitive load, is characterized in that, comprising:
Level switch module, for receiving the first pulse signal, and carries out level conversion to described the first pulse signal, to generate the second pulse signal;
Shaping pulse module, is connected with described level switch module, for obtaining described the second pulse signal, and described the second pulse signal is shaped as to driving signal;
Output buffering driver module, is connected with described shaping pulse module, for receiving described driving signal, and is described relay power supply after driving successfully, and when driving successfully, electric current is cushioned; And
Time delay output control module, for receiving described the first pulse signal, and carries out time delay output according to described the first pulse signal to described relay and controls.
2. protective circuit as claimed in claim 1, is characterized in that, described level switch module further comprises:
The first resistance;
The first triode, the base stage of described the first triode is connected with the signal source of described the first pulse signal by described the first resistance, the grounded emitter of described the first triode;
The second resistance, one end of described the second resistance is connected with the collector electrode of described the first triode;
The 3rd resistance, one end of described the 3rd resistance is connected with the other end of described the second resistance, and the other end of described the 3rd resistance is connected with the first default power supply;
The second triode, the base stage of described the second triode is connected with the other end of described the second resistance and one end of described the 3rd resistance, and emitter is connected with the described first default power supply, and collector electrode is connected with described shaping pulse module;
The 4th resistance, one end of described the 4th resistance is connected with the collector electrode of described the second triode, other end ground connection.
3. protective circuit as claimed in claim 1, is characterized in that, described shaping pulse module further comprises:
The first electric capacity, one end of described the first electric capacity is connected with described level switch module;
The 5th resistance, one end of described the 5th resistance is connected with the other end of described the first electric capacity;
The 6th resistance, one end of described the 6th resistance is connected with described level switch module, and the other end is connected with described the 5th resistance;
The 7th resistance, one end of described the 7th resistance is connected with the other end of described the 6th resistance with the other end of described the 5th resistance, the other end ground connection of described the 7th resistance;
The 8th resistance; And
The 3rd triode, the base stage of described the 3rd triode is connected with one end of the other end of described the 5th resistance, the other end of described the 6th resistance and described the 7th resistance, emitter is by described the 8th grounding through resistance, and collector electrode is connected with described output buffering driver module.
4. protective circuit as claimed in claim 2, is characterized in that, described output buffering driver module further comprises:
Switching tube, the grid of described switching tube is connected with described level switch module, and source electrode is connected with the described first default power supply, and drain electrode is connected with described relay;
The 9th resistance, the two ends of described the 9th resistance are connected with source electrode with the grid of described switching tube respectively; And
The second electric capacity, the two ends of described the second electric capacity are connected with source electrode with the grid of described switching tube respectively.
5. protective circuit as claimed in claim 1, is characterized in that, described time delay output control module further comprises:
The tenth resistance;
The 3rd electric capacity;
Control chip, the first end of described control chip, the second end and the 6th end ground connection, the 3rd end is connected with described relay, the 4th end is connected with the signal source of described the first pulse signal by described the tenth resistance, five terminal is by described the 3rd capacity earth, the 7th end is idle, and the 8th end is connected with the second default power supply;
The 11 resistance;
Diode, the positive terminal of described diode is connected with the 4th end of described control chip by described the 11 resistance, and negative pole end is connected with the signal source of described the first pulse signal;
The 4th electric capacity, one end of described the 4th electric capacity is connected with the 4th end of described control chip, other end ground connection.
6. the protective circuit as described in claim 1-5 any one, is characterized in that,
Described driving signal by described shaping pulse module carries out soft start to described output buffering driver module, and wherein, the time of soft start is the very first time;
By described output buffering driver module, be that the time that described relay is powered was the second time, wherein, the described very first time is less than described the second time;
The time delay control time of described time delay output control module was the 3rd time, and wherein, described the 3rd time is less than described the second time, and is greater than the described very first time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420092401.XU CN203859066U (en) | 2014-02-28 | 2014-02-28 | Naesthesia machine power relay capacitive load contact protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420092401.XU CN203859066U (en) | 2014-02-28 | 2014-02-28 | Naesthesia machine power relay capacitive load contact protection circuit |
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| CN203859066U true CN203859066U (en) | 2014-10-01 |
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| CN201420092401.XU Expired - Lifetime CN203859066U (en) | 2014-02-28 | 2014-02-28 | Naesthesia machine power relay capacitive load contact protection circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104882333A (en) * | 2014-02-28 | 2015-09-02 | 北京谊安医疗系统股份有限公司 | Anaesthesia machine power relay capacitive load contact protection circuit |
| CN109743050A (en) * | 2019-03-22 | 2019-05-10 | 广东美的制冷设备有限公司 | Drive control circuit and household appliance |
| CN113782388A (en) * | 2021-01-12 | 2021-12-10 | 青岛鼎信通讯股份有限公司 | Relay switch buffer circuit applied to products in power industry |
-
2014
- 2014-02-28 CN CN201420092401.XU patent/CN203859066U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104882333A (en) * | 2014-02-28 | 2015-09-02 | 北京谊安医疗系统股份有限公司 | Anaesthesia machine power relay capacitive load contact protection circuit |
| CN104882333B (en) * | 2014-02-28 | 2019-03-05 | 北京谊安医疗系统股份有限公司 | The contact protection circuit of Anesthesia machine power relay capacitive load |
| CN109743050A (en) * | 2019-03-22 | 2019-05-10 | 广东美的制冷设备有限公司 | Drive control circuit and household appliance |
| CN113782388A (en) * | 2021-01-12 | 2021-12-10 | 青岛鼎信通讯股份有限公司 | Relay switch buffer circuit applied to products in power industry |
| CN113782388B (en) * | 2021-01-12 | 2024-03-12 | 青岛鼎信通讯股份有限公司 | Relay switch buffer circuit applied to power industry products |
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Granted publication date: 20141001 |