CN207336728U - Frequency Converter Control line under-voltage detection circuit - Google Patents
Frequency Converter Control line under-voltage detection circuit Download PDFInfo
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- CN207336728U CN207336728U CN201721322809.1U CN201721322809U CN207336728U CN 207336728 U CN207336728 U CN 207336728U CN 201721322809 U CN201721322809 U CN 201721322809U CN 207336728 U CN207336728 U CN 207336728U
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- voltage detection
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Abstract
The utility model belongs to a kind of Frequency Converter Control line under-voltage detection circuit, it is characterized in that one end of 1 foot connecting resistance R4, R5, R6 and the base stage of triode T2 of 34064 chip U1,2 foot connecting resistance R3, one end of capacitance C and 2 feet of D1,3 feet meet capacitance C, 1 foot of the other end of resistance R6 and diode group D2, one end of resistance R9, the collector of triode T1, one end of resistance R2 and ground M；1 foot of diode group D1 connects the other end of the base stage of triode T1, the other end of resistance R4, one end of resistance R1 and resistance R2, and 3 feet connect the emitter of triode T1；2 feet of diode group D2 connect the emitter of triode T2；The other end of triode T3 collector connecting resistances R9 and the under-voltage detection input Ulow of central controller.The utility model circuit structure is simple, reliability, high sensitivity, can carry out under-voltage detection to 5V and 24V power supplys at the same time, avoid accident.
Description
Technical field
The utility model belongs to electric monitoring equipment, more particularly to a kind of Frequency Converter Control line under-voltage detection circuit.
Background technology
Frequency Converter Control line under-voltage will cause frequency converter to produce the uncontrollable operating status for being difficult to be therefore easily perceived by humans, when serious
Major accident can be led to.So timely, the accurate detection of control line under-voltage is vital for frequency converter safe operation.
The prior art generally using comparator detection or ADC detection (analog/digital converter) modes, can only to 24V and
5V power supplys are detected respectively, circuit structure complexity, poor sensitivity, poor reliability.
The content of the invention
It is an object of the invention to overcome above-mentioned technical deficiency, there is provided a circuit structure is simple, and reliability is high, while right
The Frequency Converter Control line under-voltage detection circuit that 24V and 5V power supplys are detected.
The utility model technical scheme applied to solve the technical problem is:A kind of Frequency Converter Control line under-voltage detection
Circuit, it is characterised in that one end of 1 foot connecting resistance R4, R5, R6 of 34064 chip U1 and the base stage of triode T2,2 foot connecting resistances
2 feet of R3, one end of capacitance C and D1,3 feet meet capacitance C, 1 foot of the other end of resistance R6 and diode group D2, the one of resistance R9
End, the collector of triode T1, one end of resistance R2 and ground M；1 foot of diode group D1 meets the base stage of triode T1, resistance R4
The other end, one end of resistance R1 and the other end of resistance R2,3 feet connect the emitter of triode T1；2 feet of diode group D2 connect
The emitter of triode T2；One end of the collector connecting resistance R8 of triode T2；The base stage connecting resistance R8's of triode T3 is another
End and one end of resistance R7, the other end and P5V power supplys of emitter connecting resistance R7, R5, R3, the other end of collector connecting resistance R9
With the under-voltage detection input Ulow of central controller；Another termination P24V power supplys of resistance R1.
The beneficial effects of the utility model are：The utility model circuit structure is simple, and reliability, high sensitivity can be at the same time
Under-voltage detection is carried out to 5V and 24V power supplys, avoids accident.
Brief description of the drawings
Below in conjunction with attached drawing, illustrated with embodiment.
Fig. 1 is the circuit diagram of Frequency Converter Control line under-voltage detection circuit.
In figure：U1-34064 chips；T1, T2, T3- triode；D1, D2- diode group；C- capacitances；R1~R9- resistance.
Embodiment
Embodiment, referring to the drawings, a kind of Frequency Converter Control line under-voltage detection circuit, it is characterised in that 34064 chip U1
One end of 1 foot connecting resistance R4, R5, R6 and the base stage of triode T2,2 foot connecting resistance R3, one end of capacitance C and diode group D2
1 foot, 3 feet connect capacitance C, 1 foot of the other end of resistance R6 and diode group D2, one end of resistance R9, the current collection of triode T1
Pole, one end of resistance R2 and ground M;1 foot of diode group D1 meets the base stage of triode T1, the other end of resistance R4, resistance R1
One end and the other end of resistance R2,3 feet connect the emitter of triode T1；2 feet of diode group D2 connect the emitter of triode T2；
One end of the collector connecting resistance R8 of triode T2；The other end of base stage connecting resistance R8 of triode T3 and one end of resistance R7,
The other end and P5V power supplys of emitter connecting resistance R7, R5, R3, the other end of collector connecting resistance R9 and owing for central controller
Press detection input Ulow;Another termination P24V power supplys of resistance R1.
The operation principle of the utility model is:Adjust the resistance value of resistance R1 and R2 so that the voltage between resistance R1 and R2
Slightly above 5V, the emitter voltage of triode T1 is equal with the voltage of base stage, triode T1 cut-offs, 2 feet of 34064 chip U1
1 foot output high level of the voltage equal to power supply P5V, 34064 chip U1, triode T2 conductings, triode T3 conductings, center control
The under-voltage detection input Ulow output high level of device processed.When power supply P24V voltages occur under-voltage, between resistance R1 and R2
Voltage is less than 5V, and the base voltage of triode T1 is less than 5V, and the emitter voltage of triode T1 is equal to power supply P5V voltages for 5V,
Then triode T1 is turned on, and 2 feet of 34064 chip U1 are low level at this time, and 1 foot is turned on 3 feet, the base voltage of triode T2
End equal to 0V, triode T2, triode T3 cut-offs, the under-voltage detection input Ulow output low levels of central controller.When
When power supply P5V voltages reduce, the 2 foot voltages of 34064 chip U1 reduce, and 1 foot is turned on 3 feet, the base voltage of triode T2
End equal to 0V, triode T2, triode T3 cut-offs, the under-voltage detection input Ulow output low levels of central controller.Institute
With no matter P24V power supplys and P5V power supplys there is undervoltage condition in which, the under-voltage detection input Ulow ends of central controller all can
Produce Voltage Drop, notify central processing unit, Frequency Converter Control under-voltage central controller will and alarm, in time place
Reason, avoids leading to major accident.
Claims (1)
- A kind of 1. Frequency Converter Control line under-voltage detection circuit, it is characterised in that 1 foot connecting resistance R4, R5, R6 of 34064 chip U1 One end and triode T2 base stage, 2 foot connecting resistance R3, one end of capacitance C and 2 feet of D1,3 feet connect capacitance C, resistance R6 it is another 1 foot of one end and diode group D2, one end of resistance R9, the collector of triode T1, one end of resistance R2 and ground M；Diode 1 foot of group D1 connects the other end of the base stage of triode T1, the other end of resistance R4, one end of resistance R1 and resistance R2, and 3 feet connect three The emitter of pole pipe T1；2 feet of diode group D2 connect the emitter of triode T2；The one of the collector connecting resistance R8 of triode T2 End；The other end of base stage connecting resistance R8 of triode T3 and one end of resistance R7, the other end of emitter connecting resistance R7, R5, R3 With P5V power supplys, the other end of collector connecting resistance R9 and the under-voltage detection input Ulow of central controller;The resistance R1 other ends Connect P24V power supplys.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721322809.1U CN207336728U (en) | 2017-10-15 | 2017-10-15 | Frequency Converter Control line under-voltage detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721322809.1U CN207336728U (en) | 2017-10-15 | 2017-10-15 | Frequency Converter Control line under-voltage detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207336728U true CN207336728U (en) | 2018-05-08 |
Family
ID=62368549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721322809.1U Expired - Fee Related CN207336728U (en) | 2017-10-15 | 2017-10-15 | Frequency Converter Control line under-voltage detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207336728U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109342973A (en) * | 2018-11-19 | 2019-02-15 | 中车大连电力牵引研发中心有限公司 | DC supply input status monitoring circuit and system |
-
2017
- 2017-10-15 CN CN201721322809.1U patent/CN207336728U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109342973A (en) * | 2018-11-19 | 2019-02-15 | 中车大连电力牵引研发中心有限公司 | DC supply input status monitoring circuit and system |
| CN109342973B (en) * | 2018-11-19 | 2022-01-18 | 中车大连电力牵引研发中心有限公司 | Direct current power supply input state monitoring circuit and system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180508 Termination date: 20201015 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |