CN204835502U - Converter main relay fail safe circuit - Google Patents
Converter main relay fail safe circuit Download PDFInfo
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- CN204835502U CN204835502U CN201520527512.3U CN201520527512U CN204835502U CN 204835502 U CN204835502 U CN 204835502U CN 201520527512 U CN201520527512 U CN 201520527512U CN 204835502 U CN204835502 U CN 204835502U
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Abstract
The utility model discloses a converter main relay fail safe circuit, including connector and opto -coupler, the connector setting is at the starting resistance both ends, and 1 foot of connector is established ties and is connected 1 foot of opto -coupler behind the first resistance, and 2 feet are unsettled, and 2 feet of opto -coupler are connected to 3 feet, first electric capacity, second resistance and diode are connected between 1 foot and 2 feet of opto -coupler, 3 foot ground connection of opto -coupler, the 2nd capacitance connection is between 4 feet and ground of opto -coupler, the third ohmic connection 4 feet of opto -coupler and + 24V between, 3 feet of connecting double diode behind the 4 foot series connection fourth resistance of opto -coupler, the 5th ohmic connection is between double diode's 3 feet and ground, double diode's 1 foot connects + 3.3V, double diode's 2 feet connect digit ground, connect CPU behind double diode's 3 feet series connection the 6th resistance. The utility model discloses a detect starting resistance both ends voltage, prevent the heavy current to pass through starting resistance, protected starting resistance can not burn out to can not arouse the malfunction, sensitivity is high, and the protection rapidly.
Description
Technical field
The utility model relates to frequency converter field, is specifically related to a kind of frequency converter main relay fail-safe circuit.
Background technology
The relay that frequency converter uses is connected in parallel on starting resistance two ends, and operationally, the dropout if relay breaks down, can burn starting resistance.Prior art many employings main relay auxiliary contact adhesive testing circuit detects the operating state of main relay, control circuit break-make, thus protects starting resistance.But main relay auxiliary contact adhesive testing circuit easily causes misoperation, and sensitivity is lower.
Utility model content
For the problems referred to above, the utility model provides a kind of frequency converter main relay fail-safe circuit, by detecting starting resistance both end voltage, plays the function preventing from burning out starting resistance.
The technical solution of the utility model is as follows:
A kind of frequency converter main relay fail-safe circuit, comprise connector and optocoupler, described connector is arranged on starting resistance two ends, 1 pin of described connector is connected and is connected 1 pin of optocoupler after the first resistance, 2 pin of described connector are unsettled, 3 pin of described connector connect 2 pin of optocoupler, first electric capacity, second resistance and diode are connected between 1 pin of described optocoupler and 2 pin, 3 pin ground connection of described optocoupler, second electric capacity is connected between 4 pin of described optocoupler and ground, 3rd resistance is connected between 4 pin of described optocoupler and+24V, 3 pin of double diode are connected after 4 pin series connection the 4th resistance of described optocoupler, 5th resistance is connected between 3 pin of described double diode and ground, 1 pin of described double diode meets+3.3V, 2 pin of described double diode connect digitally, CPU is connected after 3 pin series connection the 6th resistance of described double diode.
Advantageous Effects of the present utility model is:
The utility model, by detecting starting resistance both end voltage, stops big current by starting resistance, thus prevents from burning out starting resistance.Compare existing main relay auxiliary contact adhesive testing circuit, the operating state of the utility model energy direct-detection main relay, can not cause misoperation, highly sensitive, and protection rapidly.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further.
As shown in Figure 1, the utility model comprises connector CN1 and optocoupler PC1.Connector CN1 is arranged on starting resistance R two ends.Connect 1 pin of optocoupler PC1 after the 1 pin series resistance R1 of connector CN1,2 pin of connector CN1 are unsettled, and 3 pin of connector CN1 connect 2 pin of optocoupler PC1.Electric capacity C1, the second resistance R2 and diode D1 are connected between 1 pin of optocoupler PC1 and 2 pin, the 3 pin ground connection of optocoupler PC1, electric capacity C2 is connected between 4 pin of optocoupler PC1 and ground GND, resistance R3 is connected between 4 pin of optocoupler PC1 and+24V, connects 3 pin of double diode D2 after the 4 pin series resistance R4 of optocoupler PC1.Resistance R5 is connected between 3 pin of double diode D2 and ground GND.1 pin of double diode D2 meets+3.3V, and 2 pin of double diode D2 meet digitally DGND, connects CPU after the 3 pin series resistance R6 of double diode D2.
Above-described components and parts are commercial goods, and the components and parts model in embodiment can see table:
Main components table in Fig. 1:
| Sequence number | Components and parts code name | Components and parts type | Component parameter or model |
| 1 | CN1 | Connector | |
| 2 | PC1 | Optocoupler | PC817 |
| 3 | R1 | Resistance | 3K，3W，5％ |
| 4 | R2 | Resistance | 10K，1/10W，1％ |
| 5 | R3 | Resistance | 22K，1/10W，1％ |
| 6 | R4 | Resistance | 27K，1/10W，1％ |
| 7 | R5 | Resistance | 3.9K，1/4W，1％ |
| 8 | R6 | Resistance | 10K，1/10W，1％ |
| 9 | C1 | Electric capacity | 47uF,100V |
| 10 | C2 | Electric capacity | 220pF,50V |
| 11 | D1 | Diode | RLS4148 |
| 12 | D2 | Double diode | DAN217U |
The course of work of the present utility model is as follows:
Starting resistance R (generally about several ohm) access connector CN1, starting resistance R is in parallel with relay.Under normal operating conditions, relay adhesive, starting resistance R is shorted, and 1 pin, the 2 pin voltages of connector CN1 are 0V, optocoupler PC1 not conducting, and 4 pin of optocoupler PC1 are high-impedance state, then the utility model circuit exports CPU to is high level.When relay fault escape, starting resistance R two ends produce pressure drop, through resistance R1, electric capacity C1 buffer circuit, when the electric current and voltage of optocoupler PC1 input pin meets turn-on condition, the 4 pin voltages of optocoupler PC1 are pulled down to GND (0V), then the utility model circuit exports CPU to is low level, and now CPU interdicts the output of SPWM signal, turn off IGBT, malfunction coefficient jumped by panel.The utility model stops big current by starting resistance R, and namely protecting starting resistance R can not burn.
Design main points of the present utility model:
1, starting resistance R is connected on major loop DC bus, is high-tension circuit, have employed optocoupler PC1 and isolates, protect secondary side low-voltage circuit.
2, optocoupler PC1 input pin anti-parallel diodes D1, is used for absorbing reverse voltage, prevents optocoupler PC1 from being punctured by back-pressure.
3, current-limiting resistance R1 adopts 3W encapsulation, meets power requirement.
4, the voltage entering CPU, through diode D2 clamper, makes voltage between-0.6V ~ 3.3+0.6V, protection CPU.
5, the utility model circuit production is on power panel PCB, takes up room very little, reduces frequency converter overall volume.
Above-described is only preferred implementation of the present utility model, and the utility model is not limited to above embodiment.Be appreciated that the oher improvements and changes that those skilled in the art directly derive or associate under the prerequisite not departing from spirit of the present utility model and design, all should think and be included within protection range of the present utility model.
Claims (1)
1. a frequency converter main relay fail-safe circuit, it is characterized in that: comprise connector (CN1) and optocoupler (PC1), described connector (CN1) is arranged on starting resistance two ends, 1 pin of described connector (CN1) the first resistance (R1) of connecting connects 1 pin of optocoupler (PC1) afterwards, 2 pin of described connector (CN1) are unsettled, 3 pin of described connector (CN1) connect 2 pin of optocoupler (PC1), first electric capacity (C1), between 1 pin that second resistance (R2) and diode (D1) are connected to described optocoupler (PC1) and 2 pin, 3 pin ground connection of described optocoupler (PC1), between 4 pin that second electric capacity (C2) is connected to described optocoupler (PC1) and ground, between 4 pin that 3rd resistance (R3) is connected to described optocoupler (PC1) and+24V, 4 pin series connection the 4th resistance (R4) of described optocoupler (PC1) connect 3 pin of double diode (D2) afterwards, between 3 pin that 5th resistance (R5) is connected to described double diode (D2) and ground, 1 pin of described double diode (D2) meets+3.3V, 2 pin of described double diode (D2) connect digitally, 3 pin series connection the 6th resistance (R6) of described double diode (D2) connect CPU afterwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520527512.3U CN204835502U (en) | 2015-07-20 | 2015-07-20 | Converter main relay fail safe circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520527512.3U CN204835502U (en) | 2015-07-20 | 2015-07-20 | Converter main relay fail safe circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204835502U true CN204835502U (en) | 2015-12-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520527512.3U Active CN204835502U (en) | 2015-07-20 | 2015-07-20 | Converter main relay fail safe circuit |
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| Country | Link |
|---|---|
| CN (1) | CN204835502U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105591365A (en) * | 2016-02-25 | 2016-05-18 | 珠海格力节能环保制冷技术研究中心有限公司 | Frequency converter main circuit relay failure protection method |
| CN108923388A (en) * | 2018-08-17 | 2018-11-30 | 东菱技术有限公司 | A kind of fault detection circuit powering on buffer cell and method |
| CN109390915A (en) * | 2017-08-04 | 2019-02-26 | 浙江正泰电器股份有限公司 | Method of controlling security, equipment and its system of system with pre-charge circuit |
-
2015
- 2015-07-20 CN CN201520527512.3U patent/CN204835502U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105591365A (en) * | 2016-02-25 | 2016-05-18 | 珠海格力节能环保制冷技术研究中心有限公司 | Frequency converter main circuit relay failure protection method |
| CN109390915A (en) * | 2017-08-04 | 2019-02-26 | 浙江正泰电器股份有限公司 | Method of controlling security, equipment and its system of system with pre-charge circuit |
| CN108923388A (en) * | 2018-08-17 | 2018-11-30 | 东菱技术有限公司 | A kind of fault detection circuit powering on buffer cell and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |