CN202586292U - Short-circuit protective circuit of frequency converter - Google Patents
Short-circuit protective circuit of frequency converter Download PDFInfo
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- CN202586292U CN202586292U CN 201220072645 CN201220072645U CN202586292U CN 202586292 U CN202586292 U CN 202586292U CN 201220072645 CN201220072645 CN 201220072645 CN 201220072645 U CN201220072645 U CN 201220072645U CN 202586292 U CN202586292 U CN 202586292U
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- frequency converter
- voltage detecting
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Abstract
The utility model relates to a short-circuit protective circuit of a frequency converter. The short-circuit protective circuit comprises a voltage detection circuit module, a reference circuit module, a voltage comparison circuit module, an isolation circuit module and a control circuit module, wherein the voltage detection circuit module and the reference circuit module are respectively connected with the voltage comparison circuit module, the voltage comparison circuit module is connected with the isolation circuit module, and the isolation circuit module is connected with the control circuit module. According to the utility model, when the frequency converter is short-circuit, the voltage comparison circuit module compares the voltage after short circuit with a reference voltage, the isolation circuit enables conductivity of an isolation optical coupler, and then the control circuit module cut off driving signals, thereby protecting the frequency converter and motors against damages.
Description
Technical field
The utility model relates to a kind of protecting circuit for electrical equipment, especially a kind of frequency converter short-circuit protection circuit.
Background technology
When frequency converter moved under the frequency conversion condition, output voltage was the square-wave voltage of tens of KHzs, and the immediate current peak value is too high; The motor windings of existing insulation defect; Just very easy breakdown, the frequency converter output short-circuit appears, and cause frequency converter " to ruin " phenomenon of the failure of motor; If when being in the high frequency operation, frequency converter also can burn in the lump; Even under the fixed frequency condition of work, when especially high frequency moved, if the output short-circuit fault takes place, the output module of frequency converter also can explode, and corresponding motor also possibly burn.
The utility model content
The purpose of the utility model provides a kind of frequency converter short-circuit protection circuit of high performance universal, can solve existing frequency converter damages frequency converter and motor when output short-circuit takes place problem.
To achieve these goals, the utility model adopts following technical scheme:
A kind of frequency converter short-circuit protection circuit is characterized in that: described frequency converter short-circuit protection circuit comprises: voltage detecting circuit module, reference circuit module, voltage comparator circuit module, buffer circuit module and control circuit module; The voltage detecting circuit module of described frequency converter short-circuit protection circuit is connected with the voltage comparator circuit module respectively with the reference circuit module; Described voltage comparator circuit module is connected with the buffer circuit module, and described buffer circuit module is connected with control circuit module.
Preferably, described voltage detecting circuit module by the first via, the second road and Third Road totally three alignment detection circuits compose in parallel; Described first via testing circuit by semiconductor diode (D200) with after the first voltage detecting resistor (R200) is connected; Parallelly connected with the second voltage detecting resistor (R203) again; Detect resistor (R206) with tertiary voltage again after the parallel connection and connect, send into the negative input of pin (2) of comparator (U200); Described second alignment detection circuit by semiconductor diode (D201) with after the 4th voltage detecting resistor (R201) is connected; Parallelly connected with the 5th voltage detecting resistor (R204) again; Connect with the 6th voltage detecting resistor (R207) again after the parallel connection, send into the negative input of pin (6) of comparator (U200); Described Third Road testing circuit by semiconductor diode (D202) with after the 7th voltage detecting resistor (R202) is connected; Parallelly connected with the 8th voltage detecting resistor (R205) again; Connect with the 9th voltage detecting resistor (R208) again after the parallel connection, send into the negative input of pin (2) of comparator (U201).
Preferably, described reference circuit module comprises fiducial chip (U202), supplying resistance (R213), pressurizer (E200) and filter capacitor (C213); Described fiducial chip (U202) pin (1) connects supplying resistance (R213), and its pin (6) is connected pressurizer (E200) and filter capacitor (C213) with pin (8), and pressurizer (E200) and filter capacitor (C213) parallel connection.
Preferably, the drive output signal of described voltage comparator circuit module comprises the first via, the second road and the Third Road drive signal; Described first via drive signal (UL_0) is by pin (6) output of drive signal input chip (J200); Described the second tunnel drive signal (VL_0) is by pin (5) output of drive signal input chip (J200); Described Third Road drive signal (WL_0) is by pin (4) output of drive signal input chip (J200).
Preferably, described buffer circuit module comprises isolation resistance (R215), isolation capacitance (C211) and isolates optocoupler (PH200); Said isolation resistance (R215), isolation capacitance (C211) and isolation optocoupler (PH200) are the parallel connection relations.
Preferably, described control circuit module comprises the CPU of a controlling and driving equipment.
Owing to adopted such scheme; The utility model is when the frequency converter output short-circuit; Compare through the voltage and the reference voltage of voltage comparator circuit module after short circuit; Send into the buffer circuit module again and impel the conducting of isolation optocoupler, then control circuit module is turn-offed drive signal, and protection frequency converter and motor are not damaged.
Description of drawings
Fig. 1 is the module diagram of the utility model embodiment;
Fig. 2 is the circuit diagram of the utility model embodiment;
Embodiment
As depicted in figs. 1 and 2; A kind of frequency converter short-circuit protection circuit, it comprises: voltage detecting circuit module 1, reference circuit module 2, voltage comparator circuit module 3; Buffer circuit module 4 and control circuit module 5; The voltage detecting circuit module 1 of described frequency converter short-circuit protection circuit is connected with voltage comparator circuit module 3 respectively with reference circuit module 2, and described voltage comparator circuit module 3 is connected with buffer circuit module 4, and described buffer circuit module 4 is connected with control circuit module 5.
Described new type inverter short-circuit protection circuit is under the condition of normal operation, when voltage comparator circuit module 3 is output as when high in driving; Detect voltage with three tunnel of voltage detecting circuit module 1 and compare, when one or more short circuit, compare through voltage and reference voltage after 3 pairs of short circuits of voltage comparator circuit module; Send into buffer circuit module 4 again and impel the conducting of isolation optocoupler; At this moment, 5 pairs of drive signals of control circuit module are turn-offed, and protection frequency converter and motor do not damage.
Described voltage detecting circuit module 1 by the first via, the second road and Third Road totally three alignment detection circuits compose in parallel; Described first via testing circuit by semiconductor diode D200 with after the first voltage detecting resistor R 200 is connected; Parallelly connected with the second voltage detecting resistor R 203 again; Detect resistor R 206 with tertiary voltage again after the parallel connection and connect, send into the pin 2 negative inputs of comparator U200; Described second alignment detection circuit by semiconductor diode D201 with after the 4th voltage detecting resistor R 201 is connected; Parallelly connected with the 5th voltage detecting resistor R 204 again; Connect with the 6th voltage detecting resistor R 207 again after the parallel connection, send into the pin 6 negative inputs of comparator U200; Described Third Road testing circuit by semiconductor diode D202 with after the 7th voltage detecting resistor R 202 is connected; Parallelly connected with the 8th voltage detecting resistor R 205 again; Connect with the 9th voltage detecting resistor R 208 again after the parallel connection, send into the pin 2 negative inputs of comparator U201.Described reference circuit module 2 comprises fiducial chip U202, supplying resistance R213, pressurizer E200 and filter capacitor C213; Described fiducial chip U202 pin 1 connects supplying resistance R213, and its pin 6 is connected pressurizer (E200) and filter capacitor C213 with pin 8, and pressurizer E200 and filter capacitor C213 parallel connection; Said reference circuit module 2 produces the reference voltage of a 2.5V, compares with the voltage detection signal of importing.The drive output signal of described voltage comparator circuit module 3 comprises the first via, the second road and the Third Road drive signal; Described first via drive signal UL_0 is by pin 6 outputs of drive signal input chip J200; Described the second tunnel drive signal VL_0 is by pin 5 outputs of drive signal input chip J200; Described Third Road drive signal WL_0 is by pin 4 outputs of drive signal input chip J200; When one or more signal shorts wherein, voltage will reduce, and the 2.5V reference voltage that produces with reference circuit module 2 compares, and sends into buffer circuit module 4 and controls.Described buffer circuit module 4 comprises isolation resistance R215, isolation capacitance C211 and isolates optocoupler PH200; Described isolation resistance R215, isolation capacitance C211 and isolation optocoupler (PH200) are the parallel connection relations; The signal that described voltage comparator circuit module 3 is sent here is sent into buffer circuit module 4 and is made isolation optocoupler PH200 conducting by isolation resistance R215 and isolation capacitance C211; At this moment; Control circuit module 5 is turn-offed drive signal through CPU, and protection frequency converter and motor are not damaged.
The above is merely the preferred embodiment of the utility model; Be not thus the restriction the utility model claim; Every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the utility model.
Claims (6)
1. frequency converter short-circuit protection circuit; It is characterized in that: it comprises voltage detecting circuit module, reference circuit module, voltage comparator circuit module, buffer circuit module and control circuit module; The voltage detecting circuit module of described frequency converter short-circuit protection circuit is connected with the voltage comparator circuit module respectively with the reference circuit module; Described voltage comparator circuit module is connected with the buffer circuit module, and described buffer circuit module is connected with control circuit module.
2. frequency converter short-circuit protection circuit as claimed in claim 1 is characterized in that: described voltage detecting circuit module by the first via, the second road and Third Road totally three alignment detection circuits compose in parallel; Described first via testing circuit by semiconductor diode (D200) with after the first voltage detecting resistor (R200) is connected; Parallelly connected with the second voltage detecting resistor (R203) again; Detect resistor (R206) with tertiary voltage again after the parallel connection and connect, send into the negative input of pin (2) of comparator (U200); Described second alignment detection circuit by semiconductor diode (D201) with after the 4th voltage detecting resistor (R201) is connected; Parallelly connected with the 5th voltage detecting resistor (R204) again; Connect with the 6th voltage detecting resistor (R207) again after the parallel connection, send into the negative input of pin (6) of comparator (U200); Described Third Road testing circuit by semiconductor diode (D202) with after the 7th voltage detecting resistor (R202) is connected; Parallelly connected with the 8th voltage detecting resistor (R205) again; Connect with the 9th voltage detecting resistor (R208) again after the parallel connection, send into the negative input of pin (2) of comparator (U201).
3. frequency converter short-circuit protection circuit as claimed in claim 2 is characterized in that: described reference circuit module comprises fiducial chip (U202), supplying resistance (R213), pressurizer (E200) and filter capacitor (C213); Described fiducial chip (U202) pin (1) connects supplying resistance (R213), and its pin (6) is connected pressurizer (E200) and filter capacitor (C213) with pin (8), and pressurizer (E200) and filter capacitor (C213) parallel connection.
4. frequency converter short-circuit protection circuit as claimed in claim 3 is characterized in that: the drive output signal of described voltage comparator circuit module comprises the first via, the second road and the Third Road drive signal; Described first via drive signal (UL_0) is by pin (6) output of drive signal input chip (J200); Described the second tunnel drive signal (VL_0) is by pin (5) output of drive signal input chip (J200); Described Third Road drive signal (WL_0) is by pin (4) output of drive signal input chip (J200).
5. frequency converter short-circuit protection circuit as claimed in claim 4 is characterized in that: described buffer circuit module comprises isolation resistance (R215), isolation capacitance (C211) and isolates optocoupler (PH200); Described isolation resistance (R215), isolation capacitance (C211) and isolation optocoupler (PH200) are the parallel connection relations.
6. frequency converter short-circuit protection circuit as claimed in claim 5 is characterized in that: described control circuit module comprises the CPU of a controlling and driving equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220072645 CN202586292U (en) | 2012-02-29 | 2012-02-29 | Short-circuit protective circuit of frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220072645 CN202586292U (en) | 2012-02-29 | 2012-02-29 | Short-circuit protective circuit of frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202586292U true CN202586292U (en) | 2012-12-05 |
Family
ID=47255660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220072645 Expired - Fee Related CN202586292U (en) | 2012-02-29 | 2012-02-29 | Short-circuit protective circuit of frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202586292U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108988288A (en) * | 2018-06-27 | 2018-12-11 | 珠海格力电器股份有限公司 | Load short-circuit protection circuit and method and circuit system |
| CN109194323A (en) * | 2018-11-08 | 2019-01-11 | 常州朗奇威电器有限公司 | Optical coupling isolation circuit and its working method for motor control |
-
2012
- 2012-02-29 CN CN 201220072645 patent/CN202586292U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108988288A (en) * | 2018-06-27 | 2018-12-11 | 珠海格力电器股份有限公司 | Load short-circuit protection circuit and method and circuit system |
| CN109194323A (en) * | 2018-11-08 | 2019-01-11 | 常州朗奇威电器有限公司 | Optical coupling isolation circuit and its working method for motor control |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: SHENZHEN ENERGY TECHNOLOGY CO., LTD. Assignor: Zhu Yandong Contract record no.: 2012440020330 Denomination of utility model: Short-circuit protective circuit of frequency converter Granted publication date: 20121205 License type: Exclusive License Record date: 20121210 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| 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: 20121205 Termination date: 20200229 |