CN213461140U - DC input voltage and current protection device - Google Patents
DC input voltage and current protection device Download PDFInfo
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- CN213461140U CN213461140U CN202022724702.8U CN202022724702U CN213461140U CN 213461140 U CN213461140 U CN 213461140U CN 202022724702 U CN202022724702 U CN 202022724702U CN 213461140 U CN213461140 U CN 213461140U
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Abstract
The utility model discloses a direct current input voltage, current protection device, including input voltage detection module, input excessive pressure detection module, input undervoltage detection module, signal processing module, relay pressure differential detection module, relay actuation voltage detection module and signal input output interface. This direct current input voltage, current protection device can the accurate detection direct current system input side cross undervoltage, and through the mode of monitoring relay contact both ends voltage, the relay actuation when avoiding unusual heavy current has improved relay life, keeps apart and sends out 2 analog quantities, and the debugging is simple, changes the different input voltage of parameter adaptation slightly, and the cooperation relay uses, easily designs, and the integrated level is high, saves space.
Description
Technical Field
The utility model relates to an excessive pressure under-voltage detection device technical field specifically is a direct current input voltage, current protection device.
Background
The direct current input undervoltage and overvoltage detection device (as shown in the following figure) which is mostly adopted by similar products in the market at present only detects the input undervoltage, can not prevent abnormal heavy current and burn out relay contacts, and provides a direct current input voltage and current protection device based on the existing problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a direct current input voltage, current protection device, relay actuation when can avoiding unusual heavy current has improved relay life, and the integrated level is high, saves space, has solved among the prior art only to detect the input and has crossed undervoltage, can not prevent to burn out the problem of relay contact because of unusual heavy current.
In order to achieve the above object, the utility model provides a following technical scheme: a direct current input voltage and current protection device comprises an input voltage detection module, an input overvoltage detection module, an input undervoltage detection module, a signal processing module, a relay differential pressure detection module, a relay pull-in voltage detection module and a signal input and output interface, wherein the output end of the signal processing module is connected with the signal input and output interface, and the input end of the signal processing module is connected to the output end of the relay differential pressure detection module and the input end of the relay pull-in voltage detection module; the power input ends of the relay pressure difference detection module, the relay pull-in voltage detection module, the input overvoltage detection module and the input undervoltage detection module are all connected to the input voltage detection module, the input end of the input voltage detection module is connected with the VCC power input, the output end of the input overvoltage detection module is connected to the signal input end of the signal processing module, and the output end of the input undervoltage detection module is connected to the signal input end of the signal processing module.
Preferably, the input under-voltage detection module adopts an operational amplifier IC1B as a main element, a positive input end of an operational amplifier IC1B is connected to the input voltage detection module, a negative input end of the operational amplifier IC1B is connected to the power input, and an output end of the operational amplifier IC1B is connected to the signal processing module.
Preferably, the input overvoltage detection module adopts an operational amplifier IC1A as a main element, a positive input end of an operational amplifier IC1A is connected to the input voltage detection module, a negative input end of an operational amplifier IC1A is connected to the power input, and an output end of an operational amplifier IC1A is connected to the signal processing module.
Preferably, the relay differential pressure detection module adopts an operational amplifier IC1D as a main element, a positive input end and a negative input end of the operational amplifier IC1D are both connected to the input voltage detection module, and an output end of the operational amplifier IC1D is connected to the signal processing module.
Preferably, the relay pull-in voltage detection module adopts an operational amplifier IC1C as a main element, a positive input end and a negative input end of the operational amplifier IC1C are both connected to the input voltage detection module, and an output end of the operational amplifier IC1C is connected to the signal processing module.
Compared with the prior art, the beneficial effects of the utility model are as follows:
this direct current input voltage, current protection device can the accurate detection direct current system input side cross undervoltage, and through the mode of monitoring relay contact both ends voltage, the relay actuation when avoiding unusual heavy current has improved relay life, keeps apart and sends out 2 analog quantities, and the debugging is simple, changes the different input voltage of parameter adaptation slightly, and the cooperation relay uses, easily designs, and the integrated level is high, saves space.
Drawings
Fig. 1 is a circuit diagram of an input voltage detection module of the present invention;
fig. 2 is a circuit diagram of the input overvoltage detection module of the present invention;
FIG. 3 is a circuit diagram of the input under-voltage detection module of the present invention;
fig. 4 is a circuit diagram of the signal processing module of the present invention;
FIG. 5 is a circuit diagram of the relay differential pressure detection module of the present invention;
FIG. 6 is a circuit diagram of the relay pull-in voltage detection module of the present invention;
fig. 7 is a circuit diagram of the signal input/output interface of the present invention.
In the figure: 1. an input voltage detection module; 2. an input overvoltage detection module; 3. an input under-voltage detection module; 4. a signal processing module; 5. a relay differential pressure detection module; 6. a relay pull-in voltage detection module; 7. and a signal input and output interface.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-7, a dc input voltage and current protection device includes an input voltage detection module 1, an input overvoltage detection module 2, an input undervoltage detection module 3, a signal processing module 4, a relay differential pressure detection module 5, a relay pull-in voltage detection module 6 and a signal input/output interface 7, wherein an output end of the signal processing module 4 is connected to the signal input/output interface 7, and an input end of the signal processing module 4 is connected to an output end of the relay differential pressure detection module 5 and an input end of the relay pull-in voltage detection module 6; the relay pressure difference detection module 5, the relay actuation voltage detection module 6, the power input end of input overvoltage detection module 2 and input undervoltage detection module 3 all receives input voltage detection module 1, the input termination VCC power input of input voltage detection module 1, the output of input overvoltage detection module 2 is connected to the signal input part of signal processing module 4, the output of input undervoltage detection module 3 is connected to the signal input part of signal processing module 4.
Referring to fig. 3, the input brown-out detection module 3 uses an operational amplifier IC1B as a main component, a positive input terminal of an operational amplifier IC1B is connected to the input voltage detection module 1, a negative input terminal of an operational amplifier IC1B is connected to the power input, and an output terminal of an operational amplifier IC1B is connected to the signal processing module 4.
Referring to fig. 2, the input overvoltage detection module 2 uses an operational amplifier IC1A as a main component, a positive input terminal of the operational amplifier IC1A is connected to the input voltage detection module 1, a negative input terminal of the operational amplifier IC1A is connected to the power input, and an output terminal of the operational amplifier IC1A is connected to the signal processing module 4.
Referring to fig. 5, the relay differential pressure detection module 5 uses the operational amplifier IC1D as a main component, the positive input terminal and the negative input terminal of the operational amplifier IC1D are both connected to the input voltage detection module 1, and the output terminal of the operational amplifier IC1D is connected to the signal processing module 4.
Referring to fig. 6, the relay pull-in voltage detection module 6 uses an operational amplifier IC1C as a main component, a positive input terminal and a negative input terminal of the operational amplifier IC1C are both connected to the input voltage detection module 1, and an output terminal of the operational amplifier IC1C is connected to the signal processing module 4.
The input voltage detection module 1 monitors voltages at two ends of a relay contact, and simultaneously monitors the overvoltage and undervoltage conditions of an input end, a resistor R8, a resistor R13, a resistor R19 and a resistor R24 divide voltage and then divide an A point signal, a resistor R9, a resistor R14, a resistor R20 and a resistor R25 divide a B point signal, a WD1 is a 10V reference source, 10V reference signals are divided by a resistor R6 and a WD1, an overvoltage reference voltage signal is divided by a resistor R12, a resistor R17 and a resistor R21 and then sent to the input overvoltage detection module 2, an undervoltage reference voltage signal is divided by a resistor R10, a resistor R15 and a resistor R22 and then sent to the input undervoltage detection module 3, and a relay pull-in signal is sent to the relay pull-in detection module 6 after the resistor R11, the resistor R16 and the resistor R23.
Input overvoltage detection module 2: and comparing the B point signal with the overvoltage reference signal, and outputting an overvoltage threshold value signal.
Input undervoltage detection module 3: the B point signal is compared with the undervoltage reference signal to output an undervoltage threshold signal, and the undervoltage threshold signal is sent to the positive end of the comparator through a diode D1 and a resistor R1 to form an undervoltage protection signal.
Relay pull-in voltage detection module 6: the signal of the point B is compared with the pull-in signal of the relay, the pull-in signal of the relay is output and is sent to the positive end of the comparator through a diode D2 and a resistor R26, and a release signal of the relay is formed.
Relay differential pressure detection module 5: and comparing the signals of the point A and the point B, and outputting a differential pressure detection signal.
The signal processing module 4: the differential pressure detection signal and the differential pressure detection signal output a high level signal through an AND gate circuit (0 is output from an AND gate resistor, and 1 is output from the AND gate circuit), the optical coupler is driven, the relay suction signal is isolated and output, the input under-voltage threshold signal and the input over-voltage threshold signal pass through the AND gate, then the optical coupler is driven with the delayed relay suction signal, and the startup signal is output after isolation.
Signal input/output interface 7: IN + OUT + is relay contact 2 end, GND is input ground, VCCIN supplies power for DC-DC high-voltage side of input end, JDQ-JDQ + coil control signal, and external current-expanding circuit can be used for driving high-power relay; OK-OK + provides an isolated power-on signal for the lower topology.
In summary, the following steps: this direct current input voltage, current protection device can the accurate detection direct current system input side cross undervoltage, and through the mode of monitoring relay contact both ends voltage, the relay actuation when avoiding unusual heavy current has improved relay life, keeps apart and sends out 2 analog quantities, and the debugging is simple, changes the different input voltage of parameter adaptation slightly, and the cooperation relay uses, easily designs, and the integrated level is high, saves space.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a direct current input voltage, current protection device, includes input voltage detection module (1), input overvoltage detection module (2), input under-voltage detection module (3), signal processing module (4), relay pressure difference detection module (5), relay actuation voltage detection module (6) and signal input output interface (7), its characterized in that: the output end of the signal processing module (4) is connected with the signal input/output interface (7), and the input end of the signal processing module (4) is connected to the output end of the relay differential pressure detection module (5) and the input end of the relay pull-in voltage detection module (6); the power input end of the relay pressure difference detection module (5), the relay pull-in voltage detection module (6), the input overvoltage detection module (2) and the input undervoltage detection module (3) are connected to the input voltage detection module (1), the input end of the input voltage detection module (1) is connected to the VCC power input, the output end of the input overvoltage detection module (2) is connected to the signal input end of the signal processing module (4), and the output end of the input undervoltage detection module (3) is connected to the signal input end of the signal processing module (4).
2. A dc input voltage, current protection device according to claim 1, wherein: the input undervoltage detection module (3) adopts an operational amplifier IC1B as a main element, the positive input end of an operational amplifier IC1B is connected to the input voltage detection module (1), the negative input end of an operational amplifier IC1B is connected to the power input, and the output end of an operational amplifier IC1B is connected to the signal processing module (4).
3. A dc input voltage, current protection device according to claim 1, wherein: the input overvoltage detection module (2) adopts an operational amplifier IC1A as a main element, the positive pole input end of an operational amplifier IC1A is connected to the input voltage detection module (1), the negative pole input end of an operational amplifier IC1A is connected to the power input, and the output end of an operational amplifier IC1A is connected to the signal processing module (4).
4. A dc input voltage, current protection device according to claim 1, wherein: the relay differential pressure detection module (5) adopts an operational amplifier IC1D as a main element, the positive input end and the negative input end of the operational amplifier IC1D are both connected to the input voltage detection module (1), and the output end of the operational amplifier IC1D is connected to the signal processing module (4).
5. A dc input voltage, current protection device according to claim 1, wherein: the relay pull-in voltage detection module (6) adopts an operational amplifier IC1C as a main element, the positive input end and the negative input end of the operational amplifier IC1C are both connected to the input voltage detection module (1), and the output end of the operational amplifier IC1C is connected to the signal processing module (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022724702.8U CN213461140U (en) | 2020-11-22 | 2020-11-22 | DC input voltage and current protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022724702.8U CN213461140U (en) | 2020-11-22 | 2020-11-22 | DC input voltage and current protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213461140U true CN213461140U (en) | 2021-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022724702.8U Active CN213461140U (en) | 2020-11-22 | 2020-11-22 | DC input voltage and current protection device |
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| Country | Link |
|---|---|
| CN (1) | CN213461140U (en) |
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2020
- 2020-11-22 CN CN202022724702.8U patent/CN213461140U/en active Active
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