CN203056556U - Frequency converter charging loop having abnormity detection function - Google Patents
Frequency converter charging loop having abnormity detection function Download PDFInfo
- Publication number
- CN203056556U CN203056556U CN 201320014239 CN201320014239U CN203056556U CN 203056556 U CN203056556 U CN 203056556U CN 201320014239 CN201320014239 CN 201320014239 CN 201320014239 U CN201320014239 U CN 201320014239U CN 203056556 U CN203056556 U CN 203056556U
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- frequency converter
- charging resistor
- resistance
- temperature
- circuit
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Abstract
The utility model discloses a frequency converter charging loop having an abnormity detection function. Included is a charging loop with a charging resistor. The two ends of the charging resistor are connected in parallel with an auxiliary contact of a relay. Further included is a temperature detection circuit, which is electrically connected with a processor of a frequency converter. A temperature detection device of the temperature detection circuit is arranged beside the charging resistor. The circuit system of the utility model employs the temperature detection circuit to conduct the real-time detection on the temperature of the charging resistor of the charging loop, thereby perfectly preventing the problems of burnout of the frequency converter, interferences in the normal operation, existence of potential safety hazards, and the like due to the overheating of the charging resistor.
Description
Technical field
The utility model relates to the frequency converter charge circuit, specifically refers to a kind of frequency converter charge circuit with the abnormality detection function.
Background technology
Need to be provided with charging resistor in the frequency converter charge circuit, constitute the charging resistor circuit, its effect is the impulse current that inhibition powers on, and the initial stage of powering on will charge to electric capacity, because the filter capacitor capacity of DC side is very big, moment in charging just is equivalent to short circuit to electric current, electric current can be very big, if do not limited, is equivalent to the direct shorted to earth of electric current, charging current is excessive, can cause great impact to power supply, rectifying device etc.In the work, frequency converter powers on the initial stage by the charging resistor current limliting, and major loop electric capacity is charged, and when being charged to certain voltage, is connected in parallel on the relay adhesive at charging resistor two ends, with the charging resistor short circuit.Yet, tend to take place relay drive circuit or relay contact during work and exist unusually, thus normally adhesive of relay, and the frequency converter output current all passes through charging resistor, through the regular hour, the heating of charging resistor silk adds that charging resistor is contained in the inside of frequency converter, is difficult for being it is found that, the device of circuit board and periphery very easily appears burning, burned plastic shell not only causes whole frequency converter to be scrapped, but also has very big potential safety hazard.
In view of this, the inventor furthers investigate at the problem that existing frequency converter charge circuit exists, and this case produces thus.
The utility model content
The purpose of this utility model is to provide a kind of frequency converter charge circuit with the abnormality detection function, can the temperature of charging resistor be detected constantly, avoided causing owing to charging resistor is overheated and burnt frequency converter, influence operate as normal, have problems such as potential safety hazard.
In order to reach above-mentioned purpose, solution of the present utility model is:
A kind of frequency converter charge circuit with the abnormality detection function comprises the charge circuit that has charging resistor, the auxiliary contact of the two ends of described charging resistor relay in parallel; Also comprise the temperature sensing circuit that the processor with frequency converter is electrically connected, the temperature inspection device of this temperature sensing circuit is located at by the described charging resistor.
Described temperature sensing circuit comprises temperature inspection resistance, first resistance, second resistance and electric capacity, described temperature inspection resistance is located at by the described charging resistor, described temperature inspection resistance, second resistance and electric capacity parallel connection, an end ground connection in parallel, the other end divides two-way, one the road connects connects supply voltage behind described first resistance, and another road connects the input of described processor.
After adopting such scheme, a kind of frequency converter charge circuit with the abnormality detection function of the utility model, its charging resistor side at existing charging circuit is provided with temperature sensing circuit, for detection of the temperature of charging resistor.When the electrochemical capacitor of charging circuit is charged to certain voltage, the action of the drive circuit of relay, the relay contact adhesive, the charging resistor short circuit is no longer worked.If relay is normally during adhesive; the output current of frequency converter all passes through charging resistor; the charging resistor heating temp raises; utilize this moment the temperature sensing circuit that is placed on the next door to detect the temperature of charging resistor; and convert voltage signal to and deliver to processor; judge by processor whether temperature is unusual; when detecting when unusual; the control frequency converter stops output; thereby the electric current that flows through charging resistor reduces greatly, and temperature is cooled off reduction naturally, has avoided thus bringing device to be burnt hidden danger owing to temperature is too high; protect the device of charging resistor periphery, guaranteed the trouble free service of frequency converter.
Description of drawings
Fig. 1 is the circuit theory diagrams in this New-type charge loop.
Embodiment
In order further to explain the technical solution of the utility model, the utility model is elaborated below by specific embodiment.
A kind of frequency converter charge circuit with the abnormality detection function, comprise charge circuit, as shown in Figure 1, charge circuit has charging resistor DR3 and relay DRL1, after being in parallel, the auxiliary contact of this charging resistor DR3 and relay DRL1 are connected between the rectifier bridge and electrochemical capacitor CC1 of charging circuit, during work, frequency converter powers on and exchanges input L1-L3 and be rectified into direct voltage through rectifier bridge, by charging resistor DR3 current limliting electrochemical capacitor CC1 is charged, utilize testing circuit detection DC bus-bar voltage between dc bus PN simultaneously, deliver to the processor of CPU(frequency converter), when CPU detects busbar voltage and is raised to frequency converter normal working voltage value (being electrochemical capacitor CC1 both end voltage), the CPU output drive signal makes the drive circuit action of relay DRL1, the auxiliary contact adhesive of relay DRL1, charging resistor DR3 short circuit is no longer worked, and finishes the power up of frequency converter in this.
The main innovate point of this case is that charge circuit is also set up temperature sensing circuit, and this temperature sensing circuit is electrically connected on the processor CPU of frequency converter, and the temperature of temperature sensing circuit inspection device is located at by the described charging resistor DR3.As temperature sensing circuit one preferred embodiment, as shown in Figure 1, comprise temperature inspection resistance NTC, the first resistance DR1, the second resistance DR2 and electric capacity DC1, temperature inspection resistance NTC is located at by the charging resistor DR3, temperature inspection resistance NTC, the second resistance DR2 and electric capacity DC1 parallel connection, an end ground connection GND in parallel, the other end divides two-way, one the road connects connects power source voltage Vcc behind the first resistance DR1, and another road connects the input of processor CPU.Certainly, temperature sensing circuit can also be other arbitrary forms, as long as can detect the temperature of charging resistor DR3 and relevant parameter is delivered to processor CPU.
The temperature inspection resistance NTC of temperature sensing circuit detects the temperature of charging resistor DR3 constantly; if relay DRL1 is normally during adhesive; the output current of frequency converter all passes through charging resistor DR3; charging resistor DR3 heating temp raises; its temperature is detected and converted to voltage signal by temperature inspection resistance NTC delivers to processor CPU; processor CPU judges whether temperature is unusual; when detecting when unusual; the control frequency converter stops output; thereby the electric current that flows through charging resistor DR3 reduces greatly; temperature is cooled off reduction naturally; avoided thus bringing device to be burnt hidden danger owing to temperature is too high; protect the device of charging resistor periphery, guaranteed the trouble free service of frequency converter.Frequency converter stops output simultaneously, can also show failure alarm signal by operator, so that breakdown maintenance.
Above-described embodiment and graphic and non-limiting product form of the present utility model and style, any person of an ordinary skill in the technical field all should be considered as not breaking away from patent category of the present utility model to its suitable variation or modification of doing.
Claims (2)
1. the frequency converter charge circuit with the abnormality detection function comprises the charge circuit that has charging resistor, the auxiliary contact of the two ends of described charging resistor relay in parallel; It is characterized in that: also comprise the temperature sensing circuit that the processor with frequency converter is electrically connected, the temperature inspection device of this temperature sensing circuit is located at by the described charging resistor.
2. a kind of frequency converter charge circuit with the abnormality detection function as claimed in claim 1, it is characterized in that: described temperature sensing circuit comprises temperature inspection resistance, first resistance, second resistance and electric capacity, described temperature inspection resistance is located at by the described charging resistor, described temperature inspection resistance, second resistance and electric capacity parallel connection, an end ground connection in parallel, the other end divides two-way, and one the road connects connects supply voltage behind described first resistance, and another road connects the input of described processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320014239 CN203056556U (en) | 2013-01-11 | 2013-01-11 | Frequency converter charging loop having abnormity detection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320014239 CN203056556U (en) | 2013-01-11 | 2013-01-11 | Frequency converter charging loop having abnormity detection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203056556U true CN203056556U (en) | 2013-07-10 |
Family
ID=48739476
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320014239 Expired - Lifetime CN203056556U (en) | 2013-01-11 | 2013-01-11 | Frequency converter charging loop having abnormity detection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203056556U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109390914A (en) * | 2017-08-03 | 2019-02-26 | 乐星产电(无锡)有限公司 | The guard method of frequency converter charging circuit and device |
| 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 |
-
2013
- 2013-01-11 CN CN 201320014239 patent/CN203056556U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109390914A (en) * | 2017-08-03 | 2019-02-26 | 乐星产电(无锡)有限公司 | The guard method of frequency converter charging circuit and device |
| CN109390914B (en) * | 2017-08-03 | 2020-03-27 | 乐星产电(无锡)有限公司 | Protection method and device for charging circuit of frequency converter |
| 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130710 |
|
| CX01 | Expiry of patent term |