CN201956655U - Electrical equipment and relay protection device - Google Patents
Electrical equipment and relay protection device Download PDFInfo
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- CN201956655U CN201956655U CN2010206407697U CN201020640769U CN201956655U CN 201956655 U CN201956655 U CN 201956655U CN 2010206407697 U CN2010206407697 U CN 2010206407697U CN 201020640769 U CN201020640769 U CN 201020640769U CN 201956655 U CN201956655 U CN 201956655U
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- relay
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- conducting
- power supply
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Abstract
The utility model discloses electrical equipment and a relay protection device. The electrical equipment comprises electric equipment, a power supply, a first relay, a second relay, a resistor, a current sensor, a capacitor and a processor, wherein the electric equipment, the power supply and the first relay are connected in series to form a first circuit; the electric equipment, the power supply, the second relay, the resistor and the current sensor are connected in series to form a second circuit; the capacitor and the electric equipment are connected in parallel; when the electric equipment is required to work, the processor is used for setting the first relay off, the second relay on, and reading current values acquired by the current sensor; and when the read current value meets the preset requirement, the processor is also used for setting the first relay on, and the second relay off. The relay protection device can effectively protect a main relay from being burnt.
Description
Technical field
The utility model relates to electronic technology field, relates in particular to a kind of electric equipment and relay protection.
Background technology
In a lot of electric equipments, in order to control the wherein work of power consumption equipment (load equipment), be provided with discharge loop usually, wherein comprise main relay, when main relay is in conducting, just power consumption equipment can be worked.
But, in such as electric equipments such as electric automobiles, when main relay disconnects, the voltage at relay contact two ends may reach hundreds of volts even bigger, if main relay conducting this moment then can produce very big electric current in the moment of the closing of contact, burn relay.
For fear of the problems referred to above, need be in parallel connection precharge loop, discharge loop control relay (being main relay) two ends.The precharge loop is used for conducting before the main relay contacts adhesive, make the voltage at main relay contacts two ends (for example reduce to the safe voltage value from the higher voltage value, the normally tens of volts of safe voltage value), like this, after the main relay conducting, just can not produce very big electric current suddenly, avoid relay to be burnt.
Usually, adopt above-mentioned precharge loop after, the process of carrying out relay protection is as follows: (1) conducting precharge loop; (2) the time-delay several seconds; (3) with main relay contacts closure (making the main relay conducting).But, above-mentioned control strategy is the open loop control strategy, if break down in the precharge loop, will cause pre-charge process to lose efficacy, that is to say, under the situation of precharge loop fault, even after conducting precharge loop, postponed a period of time, in case the main relay contacts closure can cause main relay to be occurred by the problem that big electric current burns equally.
Problem at can not effectively protecting the main relay in the electric equipment in the correlation technique does not propose effective solution at present as yet.
The utility model content
Problem at can not effectively protecting main relay in the correlation technique the utility model proposes a kind of electric equipment and relay protection, can protect main relay not burnt in simple mode.
The technical solution of the utility model is achieved in that
The utility model provides a kind of electric equipment, comprises power consumption equipment, power supply and first relay, and described power supply is used for described power consumption equipment power supply.
Wherein, further comprise second relay, resistor, current sensor, capacitor and processor according to electric equipment of the present utility model, wherein, described power consumption equipment, described power supply and the series connection of described first relay form first loop, described power consumption equipment, described power supply, described second relay, described resistor and the series connection of described current sensor form second loop, and described capacitor is in parallel with described power consumption equipment;
Described processor is used under the described power consumption equipment of needs carries out the situation of work described first relay being changed to disconnection, and described second relay is changed to conducting, and reads the current value that described current sensor is gathered; Described processor also is used under the current value that reads satisfies the situation of pre-provisioning request described first relay being changed to conducting, and described second relay is changed to disconnection.
Particularly, do not satisfy at the current value that reads under the situation of described pre-provisioning request, described processor is forbidden described first relay is changed to conducting.
And above-mentioned pre-provisioning request can be 0＜I＜V/R, and wherein, I is the current value that described current sensor is gathered, the predetermined safe voltage value when V is the described first relay conducting, and R is the resistance value of described resistor.
Preferably, described processor described first relay is changed to disconnect and described second relay be changed to conducting after, the time of current value reaches scheduled time length and the current value that reads does not satisfy under the situation of described pre-provisioning request all the time if read, described processor is changed to disconnection with described second relay, and alarms.
Alternatively, described processor can be single-chip microcomputer; Described power supply can be battery pack.
The utility model also provides a kind of relay protection; be used for first relay as main relay is protected; wherein, power consumption equipment, power supply and the series connection of described first relay form first loop, and described power supply is used for described power consumption equipment power supply.
Particularly, this relay protection comprises second relay, resistor, current sensor, capacitor and processor, wherein, described power consumption equipment, described power supply, described second relay, described resistor and the series connection of described current sensor form second loop, and described capacitor is in parallel with described power consumption equipment; Described processor is used under the described power consumption equipment of needs carries out the situation of work described first relay being changed to disconnection, and described second relay is changed to conducting, and reads the current value that described current sensor is gathered; Described processor also is used under the current value that reads satisfies the situation of pre-provisioning request described first relay being changed to conducting, and described second relay is changed to disconnection.
Wherein, do not satisfy at the current value that reads under the situation of described pre-provisioning request, described processor is forbidden described first relay is changed to conducting.
In addition, described processor described first relay is changed to disconnect and described second relay be changed to conducting after, the time of current value reaches scheduled time length and the current value that reads does not satisfy under the situation of described pre-provisioning request all the time if read, described processor is changed to disconnection with described second relay, and alarms.
In addition, above-mentioned pre-provisioning request is: 0＜I＜V/R, and wherein, I is the current value that described current sensor is gathered, the predetermined safe voltage value when V is the described first relay conducting, R is the resistance value of described resistor.
By means of technique scheme; by increasing precharge loop relay (second relay); and determine whether the process that makes main relay (first relay) conducting according to the judged result that precharge loop (second loop) is gone up electric current; the problem that makes the main relay conducting blindly under the situation that can effectively avoid the precharge loop to go wrong and cause main relay to be burnt; thereby, improved the safety in utilization of electric equipment for main relay provides effective protection.
Description of drawings
Fig. 1 is the block diagram according to electric equipment of the present utility model;
Fig. 2 is the block diagram according to the concrete structure example of electric equipment of the present utility model;
Fig. 3 is according to electric current time history plot on the precharge loop under the situation of the second relay conducting in the electric equipment of the present utility model, the disconnection of first relay.
Embodiment
At the problem that can not effectively protect main relay in the correlation technique; the utility model has increased precharge loop relay (second relay); and determine whether the process that makes main relay (first relay) conducting according to the judged result that precharge loop (second loop) is gone up electric current; the problem that makes the main relay conducting blindly under the situation that can effectively avoid the precharge loop to go wrong and cause main relay to be burnt; thereby, improved the safety in utilization of electric equipment for main relay provides effective protection.
To describe embodiment of the present utility model in detail below.
According to embodiment of the present utility model, provide a kind of electric equipment.As shown in Figure 1, comprise power consumption equipment 1, power supply 2 and first relay 3 according to electric equipment of the present utility model, power supply 2 is used for power consumption equipment 1 power supply.The embodiment novel according to this use provides a kind of electric equipment.As shown in Figure 1, comprise power consumption equipment 1, power supply 2 and first relay 3 according to electric equipment of the present utility model, power supply 2 is used for power consumption equipment 1 power supply.Particularly, electric equipment further comprises second relay 4, resistor 5, current sensor 6, capacitor C and processor 7, wherein, power consumption equipment 1, power supply 2 and 3 series connection of first relay form first loop (discharge loop), power consumption equipment 1, power supply 2, second relay 4, resistor 5 and current sensor 6 series connection form second loop (precharge loop), and capacitor C is in parallel with power consumption equipment 1;
And do not satisfy under the predetermined situation about requiring at the current value that current sensor 6 reads, processor 7 can be forbidden first relay 3 is changed to conducting.
Wherein, processor can judge whether that the needs power consumption equipment carries out work according to discharge control signal.
Particularly, above-mentioned pre-provisioning request can be 0＜I＜V/R, and wherein, I is the current value that current sensor is gathered, predetermined safe voltage value when V is the first relay conducting, and R is the resistance value of resistor.Should be noted that to be in succinct purpose, ignored the impedance (resistance value of itself is less) that second relay itself has after the conducting of precharge loop for the expression of electric current herein.
Generally, processor can be single-chip microcomputer, power supply can be for comprising the battery pack of a plurality of battery units, current sensor then can adopt Hall current sensor, first relay can be the high-voltage great-current relay, second relay can be high voltage-small current relay (also can be called the preliminary filling relay), and capacitor C can be a high-voltage capacitance.
To be that example is described embodiment of the present utility model in detail below with the electric automobile.
Fig. 2 shows motor and relevant parts in the relevant electric automobile, and wherein, above-mentioned processor adopting single-chip microcomputer realizes that second relay can be connected in parallel on the two ends, contact of first relay as shown in Figure 2, and power consumption equipment can comprise motor and electric machine controller.
When carrying out work, when single-chip microcomputer is received the discharge control signal of expression " main relay adhesive ", before the adhesive main relay (before first relay is changed to conducting), adhesive pre-charge-relay (second relay is changed to conducting) owing to there is high-voltage capacitance C, is equivalent to be charged to electric capacity by resistance by battery this moment, when capacitance voltage raises, the main relay contacts both end voltage descends synchronously, and corresponding resistance both end voltage descends, and the electric current that flows through resistance reduces.If the voltage that power supply can provide is VBat, at this moment, electric current I t is exponential damping trend, for example, and as shown in Figure 3.
Suppose, the safe voltage of the first relay contact adhesive is Vth, and the resistance of resistor is R, with respect to the resistance of resistor, the conduction impedance of preliminary filling relay (second relay) can be ignored, so when the electric current 0＜It that flows through resistance＜(Vth/R), illustrate that the main relay contacts both end voltage reduced in the safe range, the contact of first relay can adhesive, single-chip microcomputer can start " main relay closing course ", that is, control preliminary filling relay disconnects, the adhesive of control main relay.
But if though electric current I t never diminishes or reduces all the time greater than (Vth/R), illustrate that then high-voltage capacitance C can not charge normal, and the contact both end voltage of main relay is higher than the safe voltage Vth of contact adhesive all the time, the expression loop exists unusual, at this moment, in order to guarantee that main relay is not burnt, single-chip microcomputer forbids making the main relay conducting, and should disconnect preliminary filling relay (second relay), report to the police simultaneously, thereby avoid resistor heating and then burnt under the long duration of action of big electric current.
If It is always 0, the pre-charge process cisco unity malfunction is described, this moment, in a single day closed main relay can make the main relay contacts two ends bear the high pressure VBat of battery pack, thereby caused the contact to be burnt, and this moment, single-chip microcomputer can not start the main relay closing course equally.
In addition, if when the discharge control signal that single-chip microcomputer receives is used for expression " the control main relay disconnects ", this moment, Single-chip Controlling directly disconnected main relay, and the preliminary filling relay need not move.
In electric equipment described above; can think; second relay, resistor, current sensor, capacitor and processor have constituted the relay protection that the utility model provides; this device can be used as an integral body; be attached on above-mentioned first loop, reach the purpose that the relay in first loop is protected.
In sum, by means of technique scheme of the present utility model, by increasing precharge loop relay (second relay), and determine whether the process that makes main relay (first relay) conducting according to the judged result that precharge loop (second loop) is gone up electric current, the problem that makes the main relay conducting blindly under the situation that can effectively avoid the precharge loop to go wrong and cause main relay to be burnt, thereby, improved the safety in utilization of electric equipment for main relay provides effective protection; In addition, in case can't collect the electric current that meets the demands for a long time then disconnect second relay, can guarantee that resistor can be because of the damage of generating heat of the big electric current of long-time conduction.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (10)
1. electric equipment, comprise power consumption equipment, the power supply and first relay, described power supply is used for described power consumption equipment power supply, it is characterized in that, described electric equipment further comprises second relay, resistor, current sensor, capacitor, and processor, wherein, described power consumption equipment, described power supply, and described first relay series connection forms first loop, described power consumption equipment, described power supply, described second relay, described resistor, and described current sensor series connection formation second loop, described capacitor is in parallel with described power consumption equipment;
Described processor is used under the described power consumption equipment of needs carries out the situation of work described first relay being changed to disconnection, and described second relay is changed to conducting, and reads the current value that described current sensor is gathered; Described processor also is used under the current value that reads satisfies the situation of pre-provisioning request described first relay being changed to conducting, and described second relay is changed to disconnection.
2. electric equipment according to claim 1 is characterized in that, does not satisfy at the current value that reads under the situation of described pre-provisioning request, and described processor is forbidden described first relay is changed to conducting.
3. electric equipment according to claim 1, it is characterized in that, described processor described first relay is changed to disconnect and described second relay be changed to conducting after, the time of current value reaches scheduled time length and the current value that reads does not satisfy under the situation of described pre-provisioning request all the time if read, described processor is changed to disconnection with described second relay, and alarms.
4. electric equipment according to claim 1 is characterized in that, described pre-provisioning request is:
0＜I＜V/R, wherein, I is the current value that described current sensor is gathered, the predetermined safe voltage value when V is the described first relay conducting, R is the resistance value of described resistor.
5. according to each described electric equipment in the claim 1 to 4, it is characterized in that described processor is a single-chip microcomputer.
6. according to each described electric equipment in the claim 1 to 4, it is characterized in that described power supply is a battery pack.
7. relay protection, be used for first relay as main relay is protected, wherein, power consumption equipment, power supply, and described first relay series connection forms first loop, described power supply is used for described power consumption equipment power supply, it is characterized in that, described device comprises second relay, resistor, current sensor, capacitor, and processor, wherein, described power consumption equipment, described power supply, described second relay, described resistor, and described current sensor series connection formation second loop, described capacitor is in parallel with described power consumption equipment;
Described processor is used under the described power consumption equipment of needs carries out the situation of work described first relay being changed to disconnection, and described second relay is changed to conducting, and reads the current value that described current sensor is gathered; Described processor also is used under the current value that reads satisfies the situation of pre-provisioning request described first relay being changed to conducting, and described second relay is changed to disconnection.
8. relay protection according to claim 7 is characterized in that, does not satisfy at the current value that reads under the situation of described pre-provisioning request, and described processor is forbidden described first relay is changed to conducting.
9. relay protection according to claim 7; it is characterized in that; described processor described first relay is changed to disconnect and described second relay be changed to conducting after; the time of current value reaches scheduled time length and the current value that reads does not satisfy under the situation of described pre-provisioning request all the time if read; described processor is changed to disconnection with described second relay, and alarms.
10. relay protection according to claim 7 is characterized in that, described pre-provisioning request is:
0＜I＜V/R, wherein, I is the current value that described current sensor is gathered, the predetermined safe voltage value when V is the described first relay conducting, R is the resistance value of described resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206407697U CN201956655U (en) | 2010-12-03 | 2010-12-03 | Electrical equipment and relay protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206407697U CN201956655U (en) | 2010-12-03 | 2010-12-03 | Electrical equipment and relay protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201956655U true CN201956655U (en) | 2011-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206407697U Expired - Fee Related CN201956655U (en) | 2010-12-03 | 2010-12-03 | Electrical equipment and relay protection device |
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| Country | Link |
|---|---|
| CN (1) | CN201956655U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986491A (en) * | 2010-12-03 | 2011-03-16 | 安徽力高新能源技术有限公司 | Electrical equipment and relay protector |
| CN115071429A (en) * | 2022-08-23 | 2022-09-20 | 江苏智能无人装备产业创新中心有限公司 | Anti-adhesion control method, device and medium for main and positive relays of electric vehicle |
-
2010
- 2010-12-03 CN CN2010206407697U patent/CN201956655U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101986491A (en) * | 2010-12-03 | 2011-03-16 | 安徽力高新能源技术有限公司 | Electrical equipment and relay protector |
| CN115071429A (en) * | 2022-08-23 | 2022-09-20 | 江苏智能无人装备产业创新中心有限公司 | Anti-adhesion control method, device and medium for main and positive relays of electric vehicle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110831 Termination date: 20191203 |