CN204669213U - A kind of frequency converter charge protector - Google Patents
A kind of frequency converter charge protector Download PDFInfo
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- CN204669213U CN204669213U CN201520372613.8U CN201520372613U CN204669213U CN 204669213 U CN204669213 U CN 204669213U CN 201520372613 U CN201520372613 U CN 201520372613U CN 204669213 U CN204669213 U CN 204669213U
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Abstract
The utility model relates to a kind of frequency converter charge protector, comprises control device, relay switch K1, diode D1 ~ D6, resistance R1 ~ R4, electrochemical capacitor C1 ~ C4, PTC ceramic thermal resistance; The power end of relay switch K1 is connected with external dc power, and the signal input part of relay switch K1 is connected with control device; Commutating circuit is connected with one end of PTC ceramic thermal resistance, and filter circuit is connected with the other end of PTC ceramic thermal resistance; Have employed possess Surge suppression function ceramic positive temperature coefficient thermistor PTC to replace traditional cement resistor, the ptc characteristics of its uniqueness can effective the continuing to increase of suppression device self-temperature, realize occurring abnormality when converter circuit, when circuital current substantially exceeds rated current, restriction or blocking-up electric current, protective circuit is not damaged; Electric current recovers normally, and circuit recovers the beneficial effect of normal work automatically.
Description
Technical field
The utility model relates to a kind of frequency converter charge protector, particularly relates to a kind of frequency converter charge protector based on PTC ceramic thermal resistance.
Background technology
Conventional frequency converter is generally the version for AC-DC-AC, forms primarily of rectification, filtering, a few part of inversion; In energising moment, because the initial voltage on capacitor is zero, capacitor charging transient can form very large surge current, particularly high power switching power supply, adopts the filtering capacitor that capacity is larger, makes surge current reach more than kiloampere.Connect moment so large surge current at power supply, may cause inputting fuse and blow or the burning of contact of closing switch, rectifier bridge overcurrent damage; Above-mentioned phenomenon all can cause frequency converter normally to work, and for this reason nearly all frequency converter is all provided with the circuit that electric current is gushed in anti-fluid stopping, the reliability service to ensure power supply normal.
Traditional " Surge suppression element " is common fixed resistance value " cement resistor ", especially kilowatt more than power product in, generally use high-power " cement resistor " as Surge suppression element.From the original intention of startup surge suppression circuit design, fixed resistance can meet the basic function-suppression start charging current of design.But also come with some shortcomings, heating as large in loss is serious, and reliability is lower;
Certain potential safety hazard is inherently there is when adopting ordinary cement resistance, because the relay in parallel with " Surge suppression element " exists the possibility that can not effectively close, as mechanical fatigue, driving malfunction, in the situations such as load faulty, the load current continued flows through the higher fixed resistance of this resistance, high temperature will certainly be produced, " cement resistor " is caused to generate heat, smolder, the dangerous phenomenon such as to burst, under extreme case, PCB can be melted down by high temperature and even light, and this is the defect that common fixed resistance value resistance exists in Surge suppression application.
Utility model content
For the problem of prior art, the purpose of this utility model is to provide a kind of trigger of frequency converter circuit arrangement, and it can realize occurring abnormality when converter circuit, when circuital current substantially exceeds rated current, and restriction or blocking-up electric current, protective circuit is not damaged; Electric current recovers normally, and circuit recovers the beneficial effect of normal work automatically.
One of for achieving the above object, a kind of frequency converter charge protector of the present utility model adopts following technical scheme:
Comprise control device, relay switch K1, diode D1 ~ D6, resistance R1 ~ R4, electrochemical capacitor C1 ~ C4, PTC ceramic thermal resistance; The power end of relay switch K1 is connected with external dc power, the signal input part of relay switch K1 is connected with control device, and one end of diode D1, one end of diode D3, one end of diode D5 and first contact jaw of relay switch K1 are all connected with one end of PTC ceramic thermal resistance; The positive pole of one end of resistance R1, the positive pole of electrochemical capacitor C1, electrochemical capacitor C3, one end of resistance R3, second contact jaw of relay switch K1, the other end of PTC ceramic thermal resistance are all connected with the high-voltage output end P+ of converter circuit; The positive pole of the negative pole of the other end of resistance R1, the negative pole of electrochemical capacitor C1, electrochemical capacitor C3, the other end of resistance R3, one end of resistance R2, the positive pole of electrochemical capacitor C2 and electrochemical capacitor C4 is all connected with one end of resistance R4; The other end of the positive pole of the positive pole of diode D2, the positive pole of diode D4, diode D6, the other end of resistance R2, the negative pole of electrochemical capacitor C2, the negative pole of electrochemical capacitor C4 and resistance R4 is all connected with the low-voltage output P-of converter circuit; The positive pole of diode D1 is all connected with the W phase line of three-phase alternating current with the negative pole of diode D2, the positive pole of diode D3 is all connected with the V phase line of three-phase alternating current with the negative pole of diode D4, and the positive pole of diode D5 is all connected with the U phase line of three-phase alternating current with the negative pole of diode D6.
The beneficial effects of the utility model are: have employed possess Surge suppression function ceramic positive temperature coefficient thermistor PTC to replace traditional cement resistor, the ptc characteristics of its uniqueness can effective the continuing to increase of suppression device self-temperature, realize occurring abnormality when converter circuit, when circuital current substantially exceeds rated current, restriction or blocking-up electric current, protective circuit is not damaged; Electric current recovers normally, and circuit recovers the beneficial effect of normal work automatically.
Accompanying drawing explanation
Fig. 1 is the utility model frequency converter charge protector figure.
Embodiment
Below, by reference to the accompanying drawings and embodiment, the utility model is described further:
With reference to Fig. 1, a kind of frequency converter charge protector that the present embodiment provides, comprises control device, relay switch K1, diode D1 ~ D6, resistance R1 ~ R4, electrochemical capacitor C1 ~ C4, PTC ceramic thermal resistance; The power end of relay switch K1 is connected with external dc power, the signal input part of relay switch K1 is connected with control device, and one end of diode D1, one end of diode D3, one end of diode D5 and first contact jaw of relay switch K1 are all connected with one end of PTC ceramic thermal resistance; The positive pole of one end of resistance R1, the positive pole of electrochemical capacitor C1, electrochemical capacitor C3, one end of resistance R3, second contact jaw of relay switch K1, the other end of PTC ceramic thermal resistance are all connected with the high-voltage output end P+ of converter circuit; The positive pole of the negative pole of the other end of resistance R1, the negative pole of electrochemical capacitor C1, electrochemical capacitor C3, the other end of resistance R3, one end of resistance R2, the positive pole of electrochemical capacitor C2 and electrochemical capacitor C4 is all connected with one end of resistance R4; The other end of the positive pole of the positive pole of diode D2, the positive pole of diode D4, diode D6, the other end of resistance R2, the negative pole of electrochemical capacitor C2, the negative pole of electrochemical capacitor C4 and resistance R4 is all connected with the low-voltage output P-of converter circuit; The positive pole of diode D1 is all connected with the W phase line of three-phase alternating current with the negative pole of diode D2, the positive pole of diode D3 is all connected with the V phase line of three-phase alternating current with the negative pole of diode D4, and the positive pole of diode D5 is all connected with the U phase line of three-phase alternating current with the negative pole of diode D6.
Annexation between diode D1 ~ D6 forms commutating circuit, resistance R1 ~ R4, and the annexation between electrochemical capacitor C1 ~ C4 forms filter circuit.
Have employed possess Surge suppression function ceramic positive temperature coefficient thermistor PTC to replace traditional cement resistor.Frequency converter charge protector has unique ptc characteristics, and resistance increases with temperature and strengthens, can effective the continuing to increase of suppression device self-temperature, and its temperature changing process is as follows:
PTC ceramic thermal resistance is positive temperature coefficient thermo-sensitive material, and it has resistivity and raises and the characteristic of increase with temperature.When PTC ceramic thermal resistance is in low temperature low-resistance, in circuit, electric current increases, and PTC ceramic thermal resistance, by current flow heats, causes PTC ceramic thermal resistance temperature to increase, after PTC ceramic thermal resistance exceedes Curie temperature, its resistance value along with the rising of temperature be increasing of step evolution.And the electric current now in circuit reduces, so that thermal power reduces; PTC ceramic thermal resistance resistance continues to increase, until tens kilohms, its heating reaches balance with heat radiation, and the temperature of PTC ceramic thermal resistance maintains near operating point, and this operating point is within the scope of 130 ~ 150 ° of C.
As seen from the above analysis; " resistance-temperature " positive correlation characteristic of PTC ceramic thermal resistance makes it have the function of " self-shield "; under the failure condition that relay can not close; it can only be heated near Curie point by the thermal power that load current produces; efficiently avoid the phenomenon of similar " cement resistor " temperature control; mean that it can protect self safely; protection is simultaneously positioned at the circuit downstream of side thereafter; and after relay failture evacuation, itself can also recover original function automatically.
Its cardinal principle is when the electric current flowing through PTC ceramic thermal resistance is no more than its maximum operating currenbt; PTC ceramic thermal resistance is in low resistive state; when when there is abnormality, circuital current substantially exceeds rated current; PTC ceramic thermal resistance suddenly generates heat; resistance sharply increases to high-impedance state; thus restriction or blocking-up electric current, protective circuit is not damaged.Electric current recovers normally, and PTC ceramic thermal resistance also returns to low resistance state automatically, and circuit recovers normal work.
To one skilled in the art, according to technical scheme described above and design, other various corresponding change and deformation can be made, and all these change and deformation all should belong within the protection range of the utility model claim.
Claims (1)
1. a frequency converter charge protector, is characterized in that: comprise control device, relay switch K1, diode D1 ~ D6, resistance R1 ~ R4, electrochemical capacitor C1 ~ C4, PTC ceramic thermal resistance; The power end of relay switch K1 is connected with external dc power, the signal input part of relay switch K1 is connected with control device, and one end of diode D1, one end of diode D3, one end of diode D5 and first contact jaw of relay switch K1 are all connected with one end of PTC ceramic thermal resistance; The positive pole of one end of resistance R1, the positive pole of electrochemical capacitor C1, electrochemical capacitor C3, one end of resistance R3, second contact jaw of relay switch K1, the other end of PTC ceramic thermal resistance are all connected with the high-voltage output end P+ of converter circuit; The positive pole of the negative pole of the other end of resistance R1, the negative pole of electrochemical capacitor C1, electrochemical capacitor C3, the other end of resistance R3, one end of resistance R2, the positive pole of electrochemical capacitor C2 and electrochemical capacitor C4 is all connected with one end of resistance R4; The other end of the positive pole of the positive pole of diode D2, the positive pole of diode D4, diode D6, the other end of resistance R2, the negative pole of electrochemical capacitor C2, the negative pole of electrochemical capacitor C4 and resistance R4 is all connected with the low-voltage output P-of converter circuit; The positive pole of diode D1 is all connected with the W phase line of three-phase alternating current with the negative pole of diode D2, the positive pole of diode D3 is all connected with the V phase line of three-phase alternating current with the negative pole of diode D4, and the positive pole of diode D5 is all connected with the U phase line of three-phase alternating current with the negative pole of diode D6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520372613.8U CN204669213U (en) | 2015-06-02 | 2015-06-02 | A kind of frequency converter charge protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520372613.8U CN204669213U (en) | 2015-06-02 | 2015-06-02 | A kind of frequency converter charge protector |
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| Publication Number | Publication Date |
|---|---|
| CN204669213U true CN204669213U (en) | 2015-09-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520372613.8U Expired - Fee Related CN204669213U (en) | 2015-06-02 | 2015-06-02 | A kind of frequency converter charge protector |
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| Country | Link |
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| CN (1) | CN204669213U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108539836A (en) * | 2018-05-31 | 2018-09-14 | 奥克斯空调股份有限公司 | Include the charging circuit and air conditioner of anti-short-circuit protection circuit |
| CN109524950A (en) * | 2018-12-28 | 2019-03-26 | 广东美的厨房电器制造有限公司 | Filter circuit, timer and cooking apparatus |
-
2015
- 2015-06-02 CN CN201520372613.8U patent/CN204669213U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108539836A (en) * | 2018-05-31 | 2018-09-14 | 奥克斯空调股份有限公司 | Include the charging circuit and air conditioner of anti-short-circuit protection circuit |
| CN108539836B (en) * | 2018-05-31 | 2024-03-22 | 奥克斯空调股份有限公司 | Charging circuit comprising short-circuit protection circuit and air conditioner |
| CN109524950A (en) * | 2018-12-28 | 2019-03-26 | 广东美的厨房电器制造有限公司 | Filter circuit, timer and cooking apparatus |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 510800, 301, 302, 305, 314, 2 and 315 shops at Yunfeng commercial building, No. Jinghu, Guangzhou Avenue, Huadu District, Guangdong, China Patentee after: GUANGZHOU ZHUFENG ELECTRIC Co.,Ltd. Address before: 510800 Guangdong Province, Guangzhou Huadu District Road No. 33 Building 1 cotton tree Patentee before: GUANGZHOU ZHUFENG ELECTRIC Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150923 |
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| CF01 | Termination of patent right due to non-payment of annual fee |