CN204928564U - IPM short -circuit protection detection circuitry of converter - Google Patents
IPM short -circuit protection detection circuitry of converter Download PDFInfo
- Publication number
- CN204928564U CN204928564U CN201520722555.7U CN201520722555U CN204928564U CN 204928564 U CN204928564 U CN 204928564U CN 201520722555 U CN201520722555 U CN 201520722555U CN 204928564 U CN204928564 U CN 204928564U
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- circuit
- ipm
- divider resistance
- drive circuit
- isolation drive
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Abstract
The utility model relates to a IPM short -circuit protection detection circuitry of converter, including one connect under the IPM module sampling resistor R1 between bridge arm output and the ground, optical couple isolation drive circuit and with controller and divider resistance R2 that optical couple isolation drive circuit is connected, divider resistance R2's one end with optical couple isolation drive circuit is connected, the other end with the overcurrent protection pin of IPM module is connected the current protection value of IPM module is adjusted down in real time in the effect of controller. The beneficial effects are that: through optical couple isolation drive circuit and divider resistance's setting, adjust the protection value adjustment unit of the electric current protection value of IPM module in real time, carry out effectual overcurrent protection to the IPM module. Its circuit design is simple reliable to with low costs, easily realize and promote.
Description
Technical field
The utility model relates to converter technology field, especially relates to a kind of IPM short-circuit protection testing circuit of frequency converter.
Background technology
IPM module is the core devices of three-phase voltage source inverter circuit, is very important in frequency converter to the protection of IPM.And inside modules is integrated with short-circuit protection, when upper and lower bridge arm leads directly to by output short-circuit fault-signal, this fault-signal can be utilized to carry out software and hardware protection.Usually, connect current foldback circuit by mode as shown in Figure 1, as shown in the figure: the lower brachium pontis output of IPM module is connected to one end of a sampling resistor R1, and is connected to the overcurrent protection pin of IPM module simultaneously, the other end ground connection of sampling resistor R1.
When circuit normally works, electric current, by the lower brachium pontis of IPM module, flows through sampling resistor R1, then gets back to the ground of power supply, so sampling resistor R1 can produce a pressure drop and be input to the overcurrent protection pin of IPM module; When this voltage drop reaches the protection value of IPM module, now module can produce protection automatically.As can be seen here, the current protection value of this IPM module is determined by sampling resistor R1, and when sampling resistor is fixed, the current protection value of IPM module is also fixed value.
In said structure; when environment changes; can not change environmentally and adjust the current protection value of IPM module in real time; IPM module (as high temperature) under a certain environment is easily caused to can not get protection because current protection value is too high; thus cause the damage of device; even damage equipment, cause the danger such as fire.
Therefore, a kind of appearance of IPM short-circuit protection testing circuit of frequency converter is necessary.
Utility model content
The utility model provides a kind of IPM short-circuit protection testing circuit of frequency converter, to solve the problem that protective circuit of the prior art easily lost efficacy.
The technical problem that the utility model solves realizes by the following technical solutions:
A kind of IPM short-circuit protection testing circuit of frequency converter; comprise one and be connected to brachium pontis output and the sampling resistor R1 between ground, optical couple isolation drive circuit and the controller be connected with described optical couple isolation drive circuit and divider resistance R2 under IPM module; one end of described divider resistance R2 is connected with described optical couple isolation drive circuit; the other end is connected with the overcurrent protection pin of described IPM module, adjusts the current protection value of IPM module under the effect of described controller in real time.
As preferred technical scheme, described optical couple isolation drive circuit adopts photoelectrical coupler PC817.
As preferred technical scheme, described divider resistance R2 is NTC negative tempperature coefficient thermistor; Or described divider resistance R2 is PTC semistor; Or described divider resistance R2 is the resistor that resistance is fixed.
The beneficial effect that the utility model has is, by the setting of optical couple isolation drive circuit and divider resistance, the protection value adjustment unit of the current protection value of adjustment IPM module, carries out effective overcurrent protection to IPM module in real time.Its circuit design is simple and reliable, and cost low, be easy to realize and promote.
Accompanying drawing explanation
In order to be illustrated more clearly in embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of prior art;
Fig. 2 is the utility model: a kind of structural representation of IPM short-circuit protection testing circuit of frequency converter;
Embodiment
The technological means realized to make the utility model, creation characteristic, reaching object and effect is easy to understand, below in conjunction with concrete diagram, setting forth the utility model further.
With reference to shown in Fig. 2; a kind of IPM short-circuit protection testing circuit of frequency converter; comprise one and be connected to brachium pontis output and the sampling resistor R1 between ground, optical couple isolation drive circuit and the controller be connected with described optical couple isolation drive circuit and divider resistance R2 under IPM module; one end of described divider resistance R2 is connected with described optical couple isolation drive circuit; the other end is connected with the overcurrent protection pin of described IPM module, adjusts the current protection value of IPM module under the effect of described controller in real time.
Described optical couple isolation drive circuit adopts photoelectrical coupler PC817.
Described divider resistance R2 of the present utility model is NTC negative tempperature coefficient thermistor; Or described divider resistance R2 is PTC semistor; Or described divider resistance R2 is the resistor that resistance is fixed.
The beneficial effect that the utility model has is, by the setting of optical couple isolation drive circuit and divider resistance, the protection value adjustment unit of the current protection value of adjustment IPM module, carries out effective overcurrent protection to IPM module in real time.Its circuit design is simple and reliable, and cost low, be easy to realize and promote.
More than show and describe general principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (5)
1. the IPM short-circuit protection testing circuit of a frequency converter; comprise one and be connected to brachium pontis output and the sampling resistor R1 between ground, optical couple isolation drive circuit and the controller be connected with described optical couple isolation drive circuit and divider resistance R2 under IPM module; one end of described divider resistance R2 is connected with described optical couple isolation drive circuit; the other end is connected with the overcurrent protection pin of described IPM module, adjusts the current protection value of IPM module under the effect of described controller in real time.
2. the IPM short-circuit protection testing circuit of a kind of frequency converter according to claim 1, is characterized in that, described optical couple isolation drive circuit adopts photoelectrical coupler PC817.
3. the IPM short-circuit protection testing circuit of a kind of frequency converter according to claim 1, is characterized in that, described divider resistance R2 is NTC negative tempperature coefficient thermistor.
4. the IPM short-circuit protection testing circuit of a kind of frequency converter according to claim 1, is characterized in that, described divider resistance R2 is PTC semistor.
5. the IPM short-circuit protection testing circuit of a kind of frequency converter according to claim 1, is characterized in that, described divider resistance R2 is the resistor that resistance is fixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520722555.7U CN204928564U (en) | 2015-09-17 | 2015-09-17 | IPM short -circuit protection detection circuitry of converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520722555.7U CN204928564U (en) | 2015-09-17 | 2015-09-17 | IPM short -circuit protection detection circuitry of converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204928564U true CN204928564U (en) | 2015-12-30 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520722555.7U Expired - Fee Related CN204928564U (en) | 2015-09-17 | 2015-09-17 | IPM short -circuit protection detection circuitry of converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204928564U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110707664A (en) * | 2019-10-30 | 2020-01-17 | 珠海格力电器股份有限公司 | IPM protection detection circuit |
-
2015
- 2015-09-17 CN CN201520722555.7U patent/CN204928564U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110707664A (en) * | 2019-10-30 | 2020-01-17 | 珠海格力电器股份有限公司 | IPM protection detection circuit |
| CN110707664B (en) * | 2019-10-30 | 2020-10-02 | 珠海格力电器股份有限公司 | IPM protection detection circuit |
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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: 20151230 Termination date: 20180917 |