CN107797056B - Braking resistor circuit contactor adhesion detection system and method - Google Patents
Braking resistor circuit contactor adhesion detection system and method Download PDFInfo
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- CN107797056B CN107797056B CN201711043520.0A CN201711043520A CN107797056B CN 107797056 B CN107797056 B CN 107797056B CN 201711043520 A CN201711043520 A CN 201711043520A CN 107797056 B CN107797056 B CN 107797056B
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- braking resistor
- main contactor
- contactor
- control unit
- rear end
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- General Physics & Mathematics (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The present invention provides a kind of braking resistor circuit contactor adhesion detection system and methods, the detection system includes braking resistor control unit, sampling unit and lower electric control unit, wherein: the braking resistor control unit, for carrying out active discharge by circuit of the semiconductor switch pipe to the main contactor rear end after receiving lower electricity instruction and first preset time that is delayed；The sampling unit, for sampling the rear end voltage of the main contactor after receiving lower electricity instruction and second preset time that is delayed；The lower electric control unit makes the braking resistor control unit enter standby mode and upload fault message when the rear end voltage of the main contactor for obtaining in sampling is higher than setting voltage.The present invention is not necessarily to extend out complicated branch current detection circuit and sample circuit, can quickly be positioned when there is adhesion fault, and since detection time is short, and entire detection process will not influence normal lower electricity.
Description
Technical field
The present invention relates to Motor Control Fields, detect more specifically to a kind of braking resistor circuit contactor adhesion
System and method.
Background technique
Braking resistor is mainly used in the mechanical system that Frequency Converter Control motor quickly stops, and helps motor by it because fast
Regenerative electric energy caused by speed parking is converted into thermal energy.For example, in electric car, it, will be electronic by braking resistor controller
The extra electric energy of feedback is released in braking resistor during braking automobile.However, once being sent out in above-mentioned braking resistor circuit
Raw contactor adhesion, it will cause contactor cut-off signal can not significant response, cell during discharge causes power battery to damage
It is bad, or even bigger danger occurs.Therefore, it is necessary to whether be glued using a kind of effective method detection brake unit contactor
Even.
Existing contactor adhesion detection technique mainly include the following types:
(1) in the two o'clock setting sampling pin of the contactor detected, by whether judging front and back absolutely pressure difference
Contactor adhesion situation is judged in certain threshold range.This detection method advantage is that principle is simple；It has a disadvantage in that:
The erroneous judgement for be easy to causeing adhesion to detect, and it is not suitable for the adhesion judgement of complicated circuit construction.
(2) increase afterflow measure loop and voltage sample circuit in braking resistor controller main circuit terminal, pass through control branch
The on-off and voltage sample value of road contactor judge the adhesion situation of main contactor.This detection method advantage is circuit
It is of a tightly knit structure, and when contactor adhesion fault occur other branch can guarantee that power battery works normally；Its defect exists
In: the complexity in battery discharge circuit is increased, sampling with high precision equipment is needed, testing cost is high.
Summary of the invention
It is easy to miss the technical problem to be solved in the present invention is that detecting for above-mentioned braking resistor circuit contactor adhesion
Sentence, the problem of circuit complexity, a kind of new braking resistor circuit contactor adhesion detection system and method are provided.
The technical solution that the present invention solves above-mentioned technical problem is to provide a kind of braking resistor circuit contactor adhesion detection
System, the braking resistor circuit include power battery, main contactor, braking resistor, buffer capacitor and semiconductor switch pipe,
And the braking resistor, buffering capacitor and semiconductor switch pipe are connected to the rear end of the main contactor, the detection system
Including braking resistor control unit, sampling unit and lower electric control unit, in which:
The braking resistor control unit, for passing through institute after receiving lower electricity instruction and first preset time that is delayed
It states semiconductor switch pipe and active discharge is carried out to the circuit of the main contactor rear end；
The sampling unit, for sampling the main contact after receiving lower electricity instruction and second preset time that is delayed
The rear end voltage of device；
The lower electric control unit, the rear end voltage of the main contactor for obtaining in sampling are higher than setting voltage
When, so that the braking resistor control unit is entered standby mode and is uploaded fault message.
In contactor adhesion detection system in braking resistor circuit of the present invention, first preset time is described
The physics delay time that main contactor disconnects, after second preset time is first preset time and the main contactor
The sum of discharge lag time of terminal circuit.
In contactor adhesion detection system in braking resistor circuit of the present invention, the discharge lag time are as follows:
In the case that the main contactor does not stick together, the rear end voltage decline of the main contactor is disconnected to from the main contactor
To the time of preset value.
In contactor adhesion detection system in braking resistor circuit of the present invention, the lower electric control unit is being sampled
When the rear end voltage of the main contactor obtained is less than or equal to setting voltage, the confession of the braking resistor control unit is disconnected
Electricity.
In contactor adhesion detection system in braking resistor circuit of the present invention, the detection system includes main contact
Device control unit is disconnected for controlling the main contactor after receiving lower electricity instruction.
The present invention also provides a kind of braking resistor circuit contactor adhesion detection method, the braking resistor circuit includes dynamic
Power battery, main contactor, braking resistor, buffering capacitor and semiconductor switch pipe, and the braking resistor, buffering capacitor and
Semiconductor switch pipe is connected to the rear end of the main contactor, and described detection method includes the following steps:
After receiving lower electricity instruction and first preset time that is delayed, by semiconductor switch pipe to main contactor rear end electricity
Road carries out active discharge；
After receiving lower electricity instruction and second preset time that is delayed, the rear end voltage of the main contactor is sampled；
Sampling obtain the main contactor rear end voltage be higher than setting voltage when, make braking resistor control unit into
Enter standby mode and uploads fault message.
In contactor adhesion detection method in braking resistor circuit of the present invention, first preset time is described
The physics delay time that main contactor disconnects, after second preset time is first preset time and the main contactor
The sum of discharge lag time of terminal circuit.
In contactor adhesion detection method in braking resistor circuit of the present invention, the discharge lag time are as follows:
In the case that the main contactor does not stick together, the rear end voltage decline of the main contactor is disconnected to from the main contactor
To the time of preset value.
In contactor adhesion detection method in braking resistor circuit of the present invention, the detection method further include:
When sampling the rear end voltage of the main contactor obtained less than or equal to setting voltage, the braking resistor control unit is disconnected
Power supply.
In contactor adhesion detection method in braking resistor circuit of the present invention, the detection method includes: to connect
The main contactor disconnection is controlled after receiving lower electricity instruction.
Braking resistor circuit contactor adhesion detection system of the invention and method, without extending out complicated tributary detection electricity
Road and sample circuit can quickly be positioned when there is adhesion fault, and since detection time is short, entire detection process
It will not influence normal lower electricity.
Detailed description of the invention
Fig. 1 is the schematic diagram of contactor adhesion detection system embodiment in braking resistor circuit of the present invention；
Fig. 2 is the main contactor rear end voltage change curve figure when discharging main contactor back-end circuit；
Fig. 3 is the flow diagram of contactor adhesion detection method embodiment in braking resistor circuit of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in Figure 1, being the schematic diagram of contactor adhesion detection system embodiment in braking resistor circuit of the present invention, the braking
Resistance loop contactor adhesion detection system is particularly applicable to detection of the contactor adhesion in electric vehicle brake unit etc..Its
In, braking resistor circuit includes power battery, main contactor KM1, braking resistor R1, buffering capacitor C1 and semiconductor switch
Pipe, and above-mentioned power battery, main contactor KM1, braking resistor R1 and semiconductor switch pipe are concatenated into circuit, buffer capacitor C1
Then it is connected in parallel with the braking resistor R1 and semiconductor switch pipe concatenated.In above-mentioned braking resistor circuit, braking resistor R1, buffering
Capacitor C1 and semiconductor switch pipe are connected to the rear end of main contactor KM1, and in order to improve safety, can also be in above-mentioned braking
Increase fuse in resistance loop.IGBT (Insulated Gate Bipolar specifically can be used in above-mentioned semiconductor switch pipe
Transistor, insulated gate bipolar transistor).Certainly in practical applications, triode, gold can also be used in semiconductor switch pipe
Belong to oxide semiconductor field effect transistor (i.e. metal-oxide-semiconductor) etc..
In one embodiment of the invention, contactor adhesion detection system in braking resistor circuit includes lower electric control unit
11, braking resistor control unit 12 and sampling unit 13, wherein braking resistor control unit 12 and sampling unit 13 respectively with
After lower electric control unit 11 connects, and the input terminal of sampling unit 13 is connected to the main contactor KM1 in braking resistor circuit
It holds (sampled point A as shown in the figure), the output end of braking resistor control unit 12 is connected to the control terminal of semiconductor switch pipe, with
The conducting and disconnection of control semiconductor switch pipe realize the electric energy of power battery so that braking resistor circuit be made to be turned on or off
It is released to braking resistor R1.Specifically, above-mentioned braking resistor control unit 12 is by semiconductor switch pipe output pulse width
Modulated signal realizes the turn-on time control of semiconductor switch pipe.
Above-mentioned braking resistor circuit contactor adhesion detection system may also include main contactor control unit, the main contact
Device control unit control main contactor KM1 after receiving lower electricity instruction is disconnected.
In the present embodiment, braking resistor control unit 12 receive it is lower electricity instruction and first preset time that is delayed after,
By semiconductor switch pipe to the circuit (resistance i.e. in buffering capacitor C1, braking resistor R1 and route of the rear end main contactor KM1
And capacitor) carry out active discharge, i.e., predetermined pulse width modulated signal, quick release are exported to the control terminal of semiconductor switch pipe
The residual voltage of capacitive load is hindered in the circuit of the rear end main contactor KM1.When wherein receiving lower electricity instruction and default delay first
Between can be executed by lower electric control unit 11, lower electric control unit 11 receive it is lower electricity instruction and first preset time that is delayed after,
Signal is sent to braking resistor control unit 12, braking resistor control unit 12 is made to carry out voltage release operation.
It is to be discharged to enter after the stage of stable development (i.e. after receiving lower electricity and instructing and be delayed the second preset time), sampling unit 13
It acquires the rear end main contactor KM1 voltage (i.e. A point voltage in Fig. 1).Wherein receive lower electricity instruction and the second preset time of delay
It can be executed by lower electric control unit 11, after lower electric control unit 11 receives lower electricity instruction and second preset time that is delayed, to
Sampling unit 13 sends signal, and the sampled voltage of feedback is obtained from sampling unit 13.
Rear end voltage of the lower electric control unit 11 in the main contactor KM1 that the sampling of sampling unit 13 obtains is higher than setting voltage
When, so that braking resistor control unit 12 is entered standby mode and upload fault message, i.e., to control system (such as electric car
Whole-control system) feedback main contactor KM1 there is adhesion fault.If the main contactor KM1 that the sampling of sampling unit 13 obtains
Rear end voltage be less than or equal to setting voltage, then descend electric control unit 11 confirmation braking resistor circuit main contactor KM1 without
Adhesion, and the power supply of braking resistor control unit 12 is disconnected, normally lower control is electric for control system.
Above-mentioned braking resistor circuit contactor adhesion detection system circuit structure is relatively simple, does not extend out complicated tributary inspection
Slowdown monitoring circuit and sample circuit, when failure, can quickly be positioned, and installation and removal are convenient；And above-mentioned braking resistor is returned
Road contactor adhesion detection system detection time is short, and not influencing control system, normally lower electricity, high safety want detection accuracy
Ask lower.In addition, above-mentioned braking resistor circuit contactor adhesion detection system passes through the electricity of the rear end quick release main contactor KM1
The residual voltage that capacitive load is hindered in road can effectively prevent erroneous judgement caused by voltage sample error, while in software strategy
Flexibility is high, has stronger scalability.
To guarantee that adhesion detection process does not influence control system normally lower electricity, while the correctness of adhesion detection can be taken into account,
The physics delay time that above-mentioned first preset time can disconnect for main contactor KM1, the physics delay time by multifactor impact,
Specifications and models, design, service life, the operating condition of such as main contactor KM1 influences, specifically can be according to the parameter setting of main contactor KM1.
Above-mentioned second preset time be the first preset time and main contactor KM1 back-end circuit the discharge lag time it
With.Wherein, the simplified model of the load of the rear end main contactor KM1 is R1C1 circuit, when main contactor KM1 is disconnected and is entered actively
After discharge mode, voltage (i.e. A point in Fig. 1) decline curve of the rear end main contactor KM1 is as shown in Fig. 2, buffering capacitor C1 two
Terminal voltage value changes with time formula are as follows:
Wherein, τ=RC, R are the resistance value of braking resistor R, and C is the capacitance for buffering capacitor C1, U0For main contactor KM1
The rear end main contactor KM1 voltage before disconnecting.The discharge lag time, T was selected according to the parameter of braking resistor control unit 12,
According to corresponding software strategy, voltage sample point (T, the U on braking resistor discharge curve are takent), the voltage of sampled point to be detected
Value Ut=δ × U0(δ is percent coefficient, is assessed according to the flash-over characteristic of hardware), is back-calculated to obtain discharge lag time T.I.e.
Discharge lag time T are as follows: in the case where main contactor KM1 does not stick together, be disconnected to main contactor from main contactor KM1
The voltage of the rear end of KM1 drops to the time of preset value.
As shown in figure 3, be the flow diagram of contactor adhesion detection method embodiment in braking resistor circuit of the present invention, on
Stating braking resistor circuit includes power battery, main contactor, braking resistor, buffering capacitor and semiconductor switch pipe, and is braked
Resistance, buffering capacitor and semiconductor switch pipe are connected to the rear end of main contactor.Detection method of the invention includes following step
It is rapid:
Step S31: from braking resistor control unit to the control terminal output pulse width modulated signal of semiconductor switch pipe,
So that the electric energy of power battery is released by braking resistor.
Step S32: step S33 is executed after receiving lower electricity instruction, otherwise continues to execute step S31.
Step S33: it disconnects main contactor (i.e. execution main contactor opening operation), and first preset time that is delayed.This
The physics delay time that one preset time can disconnect for main contactor, the physics delay time is by multifactor impact, such as main contact
Specifications and models, design, service life, operating condition of device etc. influence, specifically can be according to the parameter setting of main contactor.
Step S34: from braking resistor control unit to the control terminal output pulse width modulated signal of semiconductor switch pipe,
Active discharge is carried out to main contactor back-end circuit, i.e., hinders the residual electricity of capacitive load in the circuit of release main contactor rear end
Pressure.
Step S35: the lower electric delay time of delay.The lower electric delay time are as follows: the case where main contactor does not stick together
Under, the rear end voltage for being disconnected to main contactor from main contactor drops to the time of preset value.The lower electric delay time specifically may be used
When being discharged according to main contactor back-end circuit, main contactor rear end voltage change curve is counter to push away acquisition.
Step S36: the rear end voltage of main contactor is sampled, and is higher than in the rear end voltage for sampling the main contactor obtained and sets
When constant voltage, step S37 is executed, it is no to then follow the steps S38.
Step S37: feedback main contactor adhesion fault.It can confirm that adhesion fault occurs in main contactor, makes to make in the case of this
Dynamic resistance control unit enters standby mode and uploads fault message.
Step S38: control system is normally lower electric.Confirm that the main contactor in braking resistor circuit without adhesion, disconnects system at this time
The power supply of dynamic resistance control unit.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of protection of the claims
Subject to.
Claims (10)
1. a kind of braking resistor circuit contactor adhesion detection system, the braking resistor circuit includes power battery, main contact
Device, braking resistor, buffering capacitor and semiconductor switch pipe, and the braking resistor, buffering capacitor and semiconductor switch pipe
It is connected to the rear end of the main contactor, which is characterized in that the detection system includes braking resistor control unit, sampling unit
And lower electric control unit, in which:
The braking resistor control unit, for passing through described half after receiving lower electricity instruction and first preset time that is delayed
Conductor switching tube carries out active discharge to the circuit of the main contactor rear end；
The sampling unit, for sampling the main contactor after receiving lower electricity instruction and second preset time that is delayed
Rear end voltage；
The lower electric control unit makes when the rear end voltage of the main contactor for obtaining in sampling is higher than setting voltage
The braking resistor control unit enters standby mode and uploads fault message.
2. contactor adhesion detection system in braking resistor circuit according to claim 1, which is characterized in that described first is pre-
If the time is the physics delay time that the main contactor disconnects, second preset time is first preset time and institute
State the sum of the discharge lag time of main contactor back-end circuit.
3. contactor adhesion detection system in braking resistor circuit according to claim 2, which is characterized in that the electric discharge is prolonged
When the time are as follows: in the case where the main contactor does not stick together, be disconnected to the main contactor from the main contactor
Rear end voltage drops to the time of preset value.
4. contactor adhesion detection system in braking resistor circuit according to claim 1, it is characterised in that: automatically controlled under described
Unit processed disconnects the braking resistor when the rear end voltage for the main contactor that sampling obtains is less than or equal to setting voltage
The power supply of control unit.
5. contactor adhesion detection system in braking resistor circuit according to claim 1, it is characterised in that: the detection system
System includes main contactor control unit, is disconnected for controlling the main contactor after receiving lower electricity instruction.
6. a kind of braking resistor circuit contactor adhesion detection method based on system described in claim 1, the braking resistor
Circuit includes power battery, main contactor, braking resistor, buffering capacitor and semiconductor switch pipe, and the braking resistor, slow
Rush capacitor and semiconductor switch pipe be connected to the rear end of the main contactor, which is characterized in that the detection method include with
Lower step:
Receive it is lower electricity instruction and first preset time that is delayed after, by semiconductor switch pipe to main contactor back-end circuit into
Row active discharge；
After receiving lower electricity instruction and second preset time that is delayed, the rear end voltage of the main contactor is sampled；
Sampling obtain the main contactor rear end voltage be higher than setting voltage when, make braking resistor control unit enter to
Machine mode simultaneously uploads fault message.
7. contactor adhesion detection method in braking resistor circuit according to claim 6, which is characterized in that described first is pre-
If the time is the physics delay time that the main contactor disconnects, second preset time is first preset time and institute
State the sum of the discharge lag time of main contactor back-end circuit.
8. contactor adhesion detection method in braking resistor circuit according to claim 7, which is characterized in that the electric discharge is prolonged
When the time are as follows: in the case where the main contactor does not stick together, be disconnected to the main contactor from the main contactor
Rear end voltage drops to the time of preset value.
9. contactor adhesion detection method in braking resistor circuit according to claim 6, which is characterized in that the detection side
Method further include: when the rear end voltage for the main contactor that sampling obtains is less than or equal to setting voltage, disconnect the braking
The power supply of resistance control unit.
10. contactor adhesion detection method in braking resistor circuit according to claim 6, which is characterized in that the detection
Method includes: to control the main contactor after receiving lower electricity instruction to disconnect.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711043520.0A CN107797056B (en) | 2017-10-31 | 2017-10-31 | Braking resistor circuit contactor adhesion detection system and method |
| PCT/CN2018/112159 WO2019085836A1 (en) | 2017-10-31 | 2018-10-26 | Adhesion detection system and method for braking resistance loop contactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711043520.0A CN107797056B (en) | 2017-10-31 | 2017-10-31 | Braking resistor circuit contactor adhesion detection system and method |
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| Publication Number | Publication Date |
|---|---|
| CN107797056A CN107797056A (en) | 2018-03-13 |
| CN107797056B true CN107797056B (en) | 2019-05-31 |
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| CN201711043520.0A Active CN107797056B (en) | 2017-10-31 | 2017-10-31 | Braking resistor circuit contactor adhesion detection system and method |
Country Status (2)
| Country | Link |
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| CN (1) | CN107797056B (en) |
| WO (1) | WO2019085836A1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107797056B (en) * | 2017-10-31 | 2019-05-31 | 苏州汇川联合动力***有限公司 | Braking resistor circuit contactor adhesion detection system and method |
| CN110620019A (en) * | 2018-06-20 | 2019-12-27 | 森萨塔科技（常州）有限公司 | Hybrid DC contactor and online diagnosis system thereof |
| CN109490768B (en) * | 2018-11-12 | 2021-01-26 | 北京长城华冠汽车科技股份有限公司 | Redundancy judgment method and system for contactor contact adhesion |
| CN109733198B (en) * | 2018-11-30 | 2020-11-13 | 铜陵市优车科技有限公司 | Main contactor adhesion detection method and device, power battery system and vehicle |
| CN109444722A (en) * | 2018-12-22 | 2019-03-08 | 中国科学院宁波材料技术与工程研究所 | A kind of discharge circuit fault detection means and its method for detecting failure |
| CN109521359B (en) * | 2018-12-28 | 2020-11-03 | 华人运通(江苏)动力电池***有限公司 | Power battery cathode relay state detection circuit and method |
| CN109709479B (en) * | 2018-12-29 | 2022-01-28 | 深圳市英威腾电动汽车驱动技术有限公司 | Contactor adhesion detection circuit and contactor adhesion detection method |
| CN109917280B (en) * | 2019-02-21 | 2021-06-08 | 东软睿驰汽车技术（沈阳）有限公司 | Circuit state detection system and detection method thereof and high-voltage loop |
| CN112630538B (en) | 2019-09-24 | 2024-04-16 | 台达电子工业股份有限公司 | Method for estimating braking resistance |
| CN112083323B (en) * | 2020-07-23 | 2021-05-04 | 浙江高泰昊能科技有限公司 | Relay adhesion detection circuit and detection method thereof |
| CN112234584A (en) * | 2020-09-17 | 2021-01-15 | 邯郸钢铁集团有限责任公司 | Improved voltage type frequency converter brake circuit protection method |
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| JPH0390869A (en) * | 1989-09-01 | 1991-04-16 | Fanuc Ltd | Detection of melt-sticking of relay |
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| CN107797056B (en) * | 2017-10-31 | 2019-05-31 | 苏州汇川联合动力***有限公司 | Braking resistor circuit contactor adhesion detection system and method |
-
2017
- 2017-10-31 CN CN201711043520.0A patent/CN107797056B/en active Active
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2018
- 2018-10-26 WO PCT/CN2018/112159 patent/WO2019085836A1/en active Application Filing
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| JPH0390869A (en) * | 1989-09-01 | 1991-04-16 | Fanuc Ltd | Detection of melt-sticking of relay |
| CN203178443U (en) * | 2013-04-15 | 2013-09-04 | 中煤科工集团重庆研究院 | Device for detecting adhesion of three-phase vacuum switch contacts |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2019085836A1 (en) | 2019-05-09 |
| CN107797056A (en) | 2018-03-13 |
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