CN212278119U

CN212278119U - Mining ann's type power supply circuit of quick protection

Info

Publication number: CN212278119U
Application number: CN202021459095.0U
Authority: CN
Inventors: 宋德利
Original assignee: Huainan Leo Technology Co ltd
Current assignee: Huainan Leo Technology Co ltd
Priority date: 2020-07-22
Filing date: 2020-07-22
Publication date: 2021-01-01
Anticipated expiration: 2030-07-22

Abstract

The utility model discloses a mining ann's type power supply circuit of quick protection, including current sampling circuit, comparison circuit, impulse generator and ann output circuit, its ann's output adopts second grade or above the second grade ann's output protection measure, and every way ann's output power all comprises series connection's a direct current/direct current power supply and the control unit in order. The utility model provides a carry out this ampere of conversion to the DC power supply of input, energy output when controlling its short circuit and overflowing obtains the safe type power output of essence.

Description

Mining ann's type power supply circuit of quick protection

Technical Field

The utility model relates to an intrinsically safe type power supply circuit that explosion-proof electrical apparatus of mining flame proof and intrinsically safe type used is a non-intrinsically safe change intrinsically safe type circuit who uses in the pit in colliery.

Background

The normal use of the coal mine underground explosion-proof electric appliance is guaranteed, and the method is of great importance to the safe production of the coal mine. The existing mine explosion-proof and intrinsically safe power supply used in coal mines is basically a protection circuit formed by traditional devices, and has the defects that the energy output of an intrinsically safe power supply cannot be rapidly controlled when a load is in a short circuit or is in an overcurrent state, the protection speed is low, the intrinsically safe output current is small, sparks are easily generated, the cost is high, and the circuit is complex.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a weak point that exists for avoiding above-mentioned prior art provides a mining ann's type power supply circuit of quick protection to satisfy the mining flame proof of mine and the equipment needs of safe type of essence safety type, improve mine production economic benefits, increase the fail safe nature of borehole operation.

The utility model discloses a solve technical problem and adopt following technical scheme:

the utility model discloses quick mining ann's type power supply circuit who protects's characteristics are: comprises a current sampling circuit, a comparator OP1, a comparator OP2, a pulse generator and an intrinsically safe output circuit;

the intrinsic safety output circuit is formed by serially connecting a field effect tube Q1 and a field effect tube Q2; a non-intrinsic safety type direct current power supply input from a DC + end and a DC-end is input through a drain electrode and output through a source electrode of the field effect transistor Q1; then the current is input through the drain electrode and output through the source electrode of a field effect transistor Q2, the source electrode end of the field effect transistor Q2 is the direct current output VCC end of the intrinsic safety type power supply, and the other end of the intrinsic safety type power supply is the GND end;

one end of a sampling resistor R2 in the current sampling circuit is connected with a DC-end, the other end of the sampling resistor R2 is connected with a GND end of an intrinsic safety type power supply circuit, one end of a resistor R5 is connected with the GND end, and the other end of the resistor R5 is commonly connected with the reverse input ends of a comparator OP1 and a comparator OP 2; the positive input ends of the comparator OP1 and the comparator OP2 are reference voltage ends;

the VCC end voltage signal is connected to the input end of the I/O port of the integrated block IC2 forming the pulse generator through the detection of the resistor R7; the pulse signal output end of the integrated block IC2 is respectively connected to the inverting input ends of the comparator OP1 and the comparator OP2 through a diode D1, and the output state of the comparator is controlled by the pulse signal;

the output end of the comparator OP1 is connected with the base electrode of a triode Q3, and the collector electrode of the triode Q3 is connected with the grid electrode of a field effect transistor Q1; the output end of the comparator OP2 is connected with the base electrode of a triode Q4, the collector electrode of the triode Q4 is connected with the grid electrode of a field effect tube Q2, and the emitting electrode of a triode Q3 is connected with the emitting electrode of a triode Q4.

The utility model discloses quick mining ann's type power supply circuit who protects characteristics also lie in: and three-terminal voltage regulators are arranged at the DC + end and the DC-end, and the reference voltage of the reference voltage end of the comparator is taken from the voltage-stabilizing output end of the three-terminal voltage regulator.

The utility model discloses quick mining ann's type power supply circuit who protects characteristics also lie in: the comparator OP1 and the comparator OP2 are integrated block comparator chips, and the integrated block IC2 is a single chip.

Compared with the prior art, the utility model discloses beneficial effect embodies:

1. the utility model can effectively avoid the energy impact caused by load short circuit or overcurrent by sampling, comparing and utilizing the pulse to rapidly control the intrinsic safety output short circuit and overcurrent time of the field effect transistors Q1 and Q1;

2. the utility model can meet the requirements of mine explosion-proof and intrinsically safe equipment, improve the economic benefits of mine production and increase the safety and reliability of underground operation;

3. the utility model discloses circuit structure is simple, safe and reliable, economical and practical.

Drawings

Fig. 1 is a schematic circuit diagram of the present invention.

Detailed Description

Referring to fig. 1, the mining intrinsically safe power supply circuit for rapid protection in the present embodiment includes a current sampling circuit, a comparator OP1, a comparator OP2, a pulse generator, and an intrinsically safe output circuit.

As shown in fig. 1, the intrinsically safe output circuit is formed by serially connecting a field effect transistor Q1 and a field effect transistor Q2; a non-intrinsic safety type direct current power supply input from a DC + end and a DC-end is input through a drain electrode and output through a source electrode of the field effect transistor Q1; and then the voltage is input through the drain electrode and output through the source electrode of the field effect transistor Q2, the source electrode end of the field effect transistor Q2 is the direct current output VCC end of the intrinsic safety type power supply, and the other end of the intrinsic safety type power supply is the GND end.

One end of a sampling resistor R2 in the current sampling circuit is connected with a DC-end, the other end is connected with a GND end of the intrinsic safety type power supply circuit, one end of a resistor R5 is connected with the GND end, and the other end of the resistor R5 is commonly connected with the reverse input ends of a comparator OP1 and a comparator OP 2; the positive input ends of the comparator OP1 and the comparator OP2 are reference voltage ends.

The VCC end voltage signal is connected to the input end of the I/O port of the integrated block IC2 forming the pulse generator through the detection of the resistor R7; the pulse signal output end of the integrated block IC2 is respectively connected to the inverting input ends of the comparator OP1 and the comparator OP2 through a diode D1, and the output state of the comparator is controlled by the pulse signal.

In specific implementation, three-terminal regulators are arranged at a DC + end and a DC-end, and the reference voltage of the reference voltage end of a comparator is taken from the voltage-stabilizing output end of the three-terminal regulator; the comparator OP1 and the comparator OP2 are integrated block comparator chips, and the integrated block IC2 is a single chip.

In the embodiment, the MOS transistors Q1 and Q2 realize secondary intrinsic safety output protection, and the control units of the MOS transistors Q1 and Q2 are composed of threshold value comparison and pulse trigger control; by changing the duty ratio and the sampling signal of the pulse generator, the load short circuit rapid protection and the overcurrent rapid protection are realized, the spark energy caused by the load short circuit or the load overcurrent is restrained, and the reliability and the safety of the mining equipment can be greatly improved.

In this embodiment, the sampling resistor R2 and the output load of the intrinsically safe circuit are connected in series, the pulse signal output by the pulse generator is used to control the output state of the comparator, and further control the gates of the MOS transistor Q1 and the MOS transistor Q2, the comparator OP1 and the comparator OP2 adopt a high-speed comparator LM319, and the pulse generator IC2 adopts a single chip microcomputer MS80F 01.

With the increase of the load current, the voltage on the resistor R2 rises, the voltage is sent to the reverse input ends, namely pins 5 and 10, of the comparator OP1 and the comparator OP2 for comparison, and two control signals are output at the

pins

12 and 7 of the comparator for controlling the on and off of the MOS transistor Q1 and the MOS transistor Q2; when the instantaneous cut-off signals occur in the MOS transistor Q1 and the MOS transistor Q2, the signals are detected by the resistor R7 and sent to the pulse generator IC2, and at the moment, the output pulse of the pulse generator IC2 is sent to the reverse input ends of the comparator OP1 and the comparator OP2 through the diode D1 and controls the switching states of the MOS transistor Q1 and the MOS transistor Q2; when the short circuit or overcurrent state is relieved, the fault is detected by R7 and sent to the single chip microcomputer, the single chip microcomputer sends a fault relieving instruction to the comparator OP1 and the comparator OP2, the self-recovery function is realized, the setting of the output intrinsic safety current value can be realized by changing the threshold values of the comparator OP1 and the comparator OP2, and the control of the energy output by the intrinsic safety circuit can be realized by changing the pulse width of the pulse generator IC 2.

Claims

1. The utility model provides a mining ann's type power supply circuit of quick protection which characterized by: comprises a current sampling circuit, a comparator OP1, a comparator OP2, a pulse generator and an intrinsically safe output circuit;

one end of a sampling resistor R2 in the current sampling circuit is connected with a DC-end, the other end of the sampling resistor R2 is connected with a GND end of the intrinsic safety type power supply circuit, one end of a resistor R5 is connected with the GND end, and the other end of the resistor R5 is commonly connected with the reverse input ends of a comparator OP1 and a comparator OP 2; the positive input ends of the comparator OP1 and the comparator OP2 are reference voltage ends;

2. The fast-protection mining intrinsically safe power supply circuit of claim 1, wherein: and three-terminal voltage regulators are arranged at the DC + end and the DC-end, and the reference voltage of the reference voltage end of the comparator is taken from the voltage-stabilizing output end of the three-terminal voltage regulator.

3. The fast-protection mining intrinsically safe power supply circuit of claim 1, wherein: the comparator OP1 and the comparator OP2 are integrated block comparator chips, and the integrated block IC2 is a single chip.