CN209675924U - A kind of current-limiting type protector that short circuit is quickly cut off with overload - Google Patents
A kind of current-limiting type protector that short circuit is quickly cut off with overload Download PDFInfo
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- CN209675924U CN209675924U CN201821263607.9U CN201821263607U CN209675924U CN 209675924 U CN209675924 U CN 209675924U CN 201821263607 U CN201821263607 U CN 201821263607U CN 209675924 U CN209675924 U CN 209675924U
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Abstract
The utility model relates to the current-limiting type protectors that a kind of short circuit and overload are quickly cut off, the protector includes voltage conversion circuit, central processing unit, current converter circuit, voltage comparator circuit, zero cross detection circuit, communicating circuit, police instruction circuit, button inputting circuits, metal-oxide-semiconductor control circuit and bi-directional MOS pipe circuit, the voltage conversion circuit is separately connected central processing unit, communicating circuit, metal-oxide-semiconductor control circuit and bi-directional MOS pipe circuit, the central processing unit is separately connected current converter circuit, voltage comparator circuit, zero cross detection circuit, communicating circuit, police instruction circuit, button inputting circuits and metal-oxide-semiconductor control circuit, the current converter circuit is connect with voltage comparator circuit, the metal-oxide-semiconductor control circuit and bi-directional MOS pipe circuit connection.Compared with prior art, the utility model has many advantages, such as the short-circuit protection reaction time is short, reaction is reliable, overload protection delay is accurate etc..
Description
Technical field
The utility model relates to current-limiting type protector field, the current limliting quickly cut off more particularly, to a kind of short circuit and overload
Formula protector.
Background technique
Fire Department of Ministry of Public Security's data show that in recent years, China's electrical fire is multiple, and great casualties and property is caused to damage
It loses.In these fire incidents, because what the electric wirings problem such as electric leakage, short circuit, overload, poor contact caused accounts for 60%.Such as
When where problem occurs for power supply system, current supply circuit is cut off in time, prevents the deterioration of problem, has further caused the weight of people
Depending on.
Overload protection and short-circuit protection, the electric fire control the problem of on, have very important status.But
Currently there are short circuit and overload protection equipment have that technological obsolescence, hardware platform are backward, reaction speed is slow mostly
It is the problems such as (short-circuit protection 100ms or so), overload are cut off not in time, limited to the protection of power supply system.
Utility model content
The purpose of this utility model is exactly to provide a kind of short-circuit and mistake to overcome the problems of the above-mentioned prior art
Carry the current-limiting type protector quickly cut off.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of current-limiting type protector that short circuit is quickly cut off with overload, which includes voltage conversion circuit, centre
Manage unit, current converter circuit, voltage comparator circuit, zero cross detection circuit, communicating circuit, police instruction circuit, key-press input
Circuit, metal-oxide-semiconductor control circuit and bi-directional MOS pipe circuit, the voltage conversion circuit are separately connected central processing unit, communication
Circuit, metal-oxide-semiconductor control circuit and bi-directional MOS pipe circuit, the central processing unit are separately connected current converter circuit, voltage
Comparison circuit, zero cross detection circuit, communicating circuit, police instruction circuit, button inputting circuits and metal-oxide-semiconductor control circuit, it is described
Current converter circuit connect with voltage comparator circuit, the metal-oxide-semiconductor control circuit and bi-directional MOS pipe circuit connection.
Preferably, the police instruction circuit includes No. 1 buzzer output unit and 2 LED indication units.
Preferably, the communicating circuit is the RS485 communicating circuit based on Modbus agreement.
Preferably, the central processing unit is the single-chip microcontroller using STM32F series.
Preferably, the alternating voltage 22V of power supply system is converted to the conversion electricity of 5V voltage by the voltage conversion circuit
Road.
Preferably, the current converter circuit is current transformer.
Preferably, the voltage comparator circuit is voltage comparator.
Compared with prior art, the utility model has the advantage that
1, central processing unit is up to 72MHz using dominant frequency, and 32 high performance processor chips have in abundant
Peripheral hardware simultaneously has ADC inside 2 up to 18 tunnels, simplifies the design of circuit, improves the reliability and the speed of service of product.
2, short-circuit reaction speed is fast.When short circuit occurs for power supply system, this product can quickly be cut off within 150us
Circuit reduces electric arc and generates.
3, short-circuit reaction is reliable.The utility model relates to current-limiting type protector, power supply system occur short circuit when,
Reliably cut off the power.
4, overload delay is accurate, using inverse time-lag protection function, by the integral with Current versus time, when calculating excision
Between, it is not influenced by curent change.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model.
Specific embodiment
The technical scheme in the embodiment of the utility model will be carried out clear, be fully described by, it is clear that described below
Embodiment is a part of the embodiment of the utility model, rather than whole embodiments.Based on the embodiments of the present invention, originally
Field those of ordinary skill every other embodiment obtained without making creative work all should belong to this
The range of utility model protection.
As shown in Figure 1, the current-limiting type protector that a kind of short circuit and overload are quickly cut off, which includes voltage conversion electricity
Road 1, central processing unit 7, current converter circuit 2, voltage comparator circuit 3, zero cross detection circuit 10, communicating circuit 6, alarm refer to
Show that circuit 9, button inputting circuits 8, metal-oxide-semiconductor control circuit 4 and bi-directional MOS pipe circuit 5, the voltage conversion circuit 1 are distinguished
Connect central processing unit 7, communicating circuit 6, metal-oxide-semiconductor control circuit 4 and bi-directional MOS pipe circuit 5, the central processing unit
7 be separately connected current converter circuit 2, voltage comparator circuit 3, zero cross detection circuit 10, communicating circuit 6, police instruction circuit 9,
Button inputting circuits 8 and metal-oxide-semiconductor control circuit 4, the current converter circuit 2 is connect with voltage comparator circuit 3, described
Metal-oxide-semiconductor control circuit 4 is connect with bi-directional MOS pipe circuit 5.
The police instruction circuit 9 includes No. 1 buzzer output unit and 2 LED indication units.The communication electricity
Road 6 is the RS485 communicating circuit based on Modbus agreement.The central processing unit 7 is the monolithic using STM32F series
Machine.The alternating voltage 220V of power supply system is converted to the AC to DC converter circuit of 5V voltage by the voltage conversion circuit 1.Institute
The zero cross detection circuit stated is the detection circuit of isolation, and optocoupler primary diode is connected on ac circuit, is added in optocoupler secondary
The zero cross detection circuit of pull-up resistor.The metal-oxide-semiconductor control loop be two-way metal-oxide-semiconductor differential concatenation together, with isolation+
15V and 0V signal controls its conducting and dead circuit simultaneously.
The voltage conversion circuit 1 provides 5V power supply for whole system；Practical big electricity of the current converter circuit 2 system
Circulation turns to low current, and voltage comparator circuit 3 is a voltage comparator, and central processing unit 7 is the core of device, in ARM
Serial 32 bit processors of the STM32 of core, peripheral hardware is abundant in piece, and peripheral circuit is simple.Central processing unit 7 is responsible for adopting for each signal
Sample and processing, and judged whether to need to disconnect power supply system according to processing result, and issue accordingly by police instruction circuit 9
Sound and light alarm signal.Zero cross detection circuit 10 is used to judge the phase of system, for short circuit judgement.Button inputting circuits 8 are used for
After troubleshooting, function that system is resetted.
Working principle of the utility model is:
Voltage conversion circuit 1 takes electricity from power supply system, powers for modules.Current converter circuit 2 is electric current conversion
Element, such as current transformer enter voltage comparator circuit 3 by processing, obtain point of zero voltage by zero cross detection circuit 10.One
Aspect, the signal enter central processing unit 7, judge whether that short circuit or overload fault occurs；Another aspect electric current conversion electricity
Road enters voltage comparator circuit 3, when the electric current in system is greater than preset current threshold, is captured, sentences by central processing unit 7
Break as short circuit.If overload fault occurs for system, in the way of inverse time current protection, calculating current to the integral of time,
When integral is greater than preset threshold value, overload protection is carried out.Either former short trouble or latter overload fault,
It will starting protection immediately.Metal-oxide-semiconductor circuit 5 is controlled by metal-oxide-semiconductor control circuit 4, disconnects power supply system, and pass through report
Alert indicating circuit 9 issues sound-light alarm；It after determining trouble shooting, presses the button, by button inputting circuits 8, to system
It is resetted.All calibration data and setting data are all saved in the flash of central processing unit 7.Host computer passes through
Communicating circuit 6 and central processing unit 7 carry out data interaction.It, can will be corresponding if host computer write-in is the data such as calibration
It is saved in data write-in central processing unit 7, when next time restarts system, corresponding data can be read automatically, do not need to repeat to be arranged.
Above description is only a specific implementation of the present invention, but the protection scope of the utility model is not limited to
In this, anyone skilled in the art within the technical scope disclosed by the utility model, can be readily occurred in various
Equivalent modifications or substitutions, these modifications or substitutions should be covered within the scope of the utility model.Therefore, this is practical
Novel protection scope should be subject to the protection scope in claims.
Claims (7)
1. the current-limiting type protector that a kind of short circuit and overload are quickly cut off, which is characterized in that the protector includes voltage conversion electricity
Road, central processing unit, current converter circuit, voltage comparator circuit, zero cross detection circuit, communicating circuit, police instruction circuit,
Button inputting circuits, metal-oxide-semiconductor control circuit and bi-directional MOS pipe circuit, the voltage conversion circuit are separately connected central processing
Unit, communicating circuit, metal-oxide-semiconductor control circuit and bi-directional MOS pipe circuit, the central processing unit are separately connected electric current conversion
Circuit, voltage comparator circuit, zero cross detection circuit, communicating circuit, police instruction circuit, button inputting circuits and metal-oxide-semiconductor control
Circuit, the current converter circuit are connect with voltage comparator circuit, the metal-oxide-semiconductor control circuit and bi-directional MOS pipe circuit
Connection.
2. current-limiting type protector according to claim 1, which is characterized in that the police instruction circuit includes 1 tunnel bee
Ring device output unit and 2 LED indication units.
3. current-limiting type protector according to claim 1, which is characterized in that the communicating circuit is to be assisted based on Modbus
The RS485 communicating circuit of view.
4. current-limiting type protector according to claim 1, which is characterized in that the central processing unit is to use
The single-chip microcontroller of STM32F series.
5. current-limiting type protector according to claim 1, which is characterized in that the voltage conversion circuit is by power supply system
Alternating voltage 22V be converted to the conversion circuit of 5V voltage.
6. current-limiting type protector according to claim 1, which is characterized in that the current converter circuit is Current Mutual Inductance
Device.
7. current-limiting type protector according to claim 1, which is characterized in that the voltage comparator circuit compares for voltage
Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821263607.9U CN209675924U (en) | 2018-08-07 | 2018-08-07 | A kind of current-limiting type protector that short circuit is quickly cut off with overload |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821263607.9U CN209675924U (en) | 2018-08-07 | 2018-08-07 | A kind of current-limiting type protector that short circuit is quickly cut off with overload |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209675924U true CN209675924U (en) | 2019-11-22 |
Family
ID=68559887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821263607.9U Active CN209675924U (en) | 2018-08-07 | 2018-08-07 | A kind of current-limiting type protector that short circuit is quickly cut off with overload |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209675924U (en) |
-
2018
- 2018-08-07 CN CN201821263607.9U patent/CN209675924U/en active Active
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