CN207884493U - A kind of excitation power supply - Google Patents

Abstract

The utility model is related to a kind of excitation power supplies,On-chip power power protecting circuit,8 ports and 11 12 ports of sucker U1 connect+12V voltages simultaneously in circuit,+ 12V voltages are grounded through capacitance C3 simultaneously,14 15 ports and 2 ports of chip U1 are grounded through slide rheostat R8 simultaneously,3 ports of chip U1 connect the contact end of slide rheostat R3,1 port of chip U1,7 ports,13 ports and 16 ports are grounded simultaneously,5 ports of chip U1 are grounded through capacitance C2,6 ports of chip U1 are grounded through resistance R7,4 ports of chip U1 connect 1 port of chip U2,4 ports of chip U1 connect 3 ports of chip U2 through diode D1 simultaneously,Diode D1 connecting resistances R4,A kind of excitation power supply security performance of the utility model design is high,It is simple to operate.

Description

A kind of excitation power supply

Technical field

The utility model is related to circuitry field more particularly to a kind of excitation power supplies.

Background technology

There are destabilizing factors for power input voltage in modern circuits, and circuit system is caused to be easy multiple harmonic, to shadow The stable operation of acoustic system equipment, power input voltage is excessively high when serious causes circuit devcie to burn out, and influences the normal fortune of enterprise Row, to substantially reduce the working efficiency of staff.

Utility model content

The purpose of this utility model is to provide a kind of excitation power supplies, to solve the above technical problems, to realize above-mentioned mesh The utility model use following technical scheme：

A kind of excitation power supply, on-chip power power protecting circuit, 8 ports and the ports 11-12 of sucker U1 are same in circuit When connect+12V voltages ,+12V voltages are grounded through capacitance C3 simultaneously, and the ports 14-15 and 2 ports of chip U1 become through sliding simultaneously Device R8 ground connection is hindered, 3 ports of chip U1 connect the contact end of slide rheostat R3,1 port, 7 ports, 13 ports and 16 of chip U1 Port is grounded simultaneously, and 5 ports of chip U1 are grounded through capacitance C2, and 6 ports of chip U1 are grounded through resistance R7,4 ends of chip U1 Mouth connects 1 port of chip U2, while 4 ports of chip U1 connect 3 ports of chip U2, diode D1 connecting resistances through diode D1 The ports 9-10 of R4, chip U1 connect output end through resistance R5 simultaneously, while resistance R5 is grounded through resistance R6,8 ports of chip U2 + 12V voltages are connect, the 4 ports ground connection of chip U2, resistance R4 is respectively through capacitance C1 and resistance R3 ground connection, while resistance R4 is through resistance R2 connects the anode of battery, while the cathode ground connection of battery.

On the basis of above-mentioned technical proposal, the chip U1 uses TL494 type fixed frequency pulse-width modulation circuits, chip U2 LM358 type dual operational amplifiers.

A kind of excitation power supply of the utility model design, TL494 is a kind of arteries and veins that Texas Instruments produces at first Wide modulating switch power source integrated manipulator, by sawtooth waveform generator, two error amplifiers, two comparators, 5V benchmark electricity Potential source, d type flip flop, the compositions such as two driving triodes are stable, low in energy consumption, effectively filter out multiple harmonic, improve circuit Stability, while LM358 is dual operational amplifier, by there are two the operation amplifiers of independent, high-gain, internal frequency compensation Device, the supply voltage scope of application is very wide, is also applied for dual power supply operating mode, and source current is unrelated with voltage, is to improve The scope of application for equipment of uniting, greatly improves the working efficiency of staff.

Description of the drawings

Fig. 1 is the circuit diagram of the utility model.

Specific implementation mode

The utility model is further elaborated in the following with reference to the drawings and specific embodiments.

A kind of excitation power supply, on-chip power power protecting circuit, 8 ports and the ports 11-12 of sucker U1 are same in circuit When connect+12V voltages ,+12V voltages are grounded through capacitance C3 simultaneously, and the ports 14-15 and 2 ports of chip U1 become through sliding simultaneously Device R8 ground connection is hindered, 3 ports of chip U1 connect the contact end of slide rheostat R3,1 port, 7 ports, 13 ports and 16 of chip U1 Port is grounded simultaneously, and 5 ports of chip U1 are grounded through capacitance C2, and 6 ports of chip U1 are grounded through resistance R7,4 ends of chip U1 Mouth connects 1 port of chip U2, while 4 ports of chip U1 connect 3 ports of chip U2, diode D1 connecting resistances through diode D1 The ports 9-10 of R4, chip U1 connect output end through resistance R5 simultaneously, while resistance R5 is grounded through resistance R6,8 ports of chip U2 + 12V voltages are connect, the 4 ports ground connection of chip U2, resistance R4 is respectively through capacitance C1 and resistance R3 ground connection, while resistance R4 is through resistance R2 connects the anode of battery, while the cathode ground connection of battery.

A kind of excitation power supply of the utility model design, chip U1 use TL494 type fixed frequency pulse-width modulation circuits, core The LM358 type dual operational amplifiers of piece U2.Impulse hunting module overvoltage crowbar is that being exported in specific design for simulation is high Protection circuit when pressure, when adjustable voltage exports 30V, the electric current flowed through in sample circuit is 30 μ A and high-tension measurement end Electric current it is equal, sampling resistor 200K, sampled voltage 6V, once adjustable voltage output is more than 30V, sampled voltage is more than Sampled signal is delivered to the in-phase input end of voltage comparator LM358 by 6V, the filtered circuit of this sampled signal, and LM358's is anti- Mutually input termination 6V reference voltages, homophase input terminal voltage are more than anti-phase input terminal voltage, and the output end of LM358 exports a height Level controls 4 ports (idle time sets end, 0~3.5V of operating voltage) of TL494, and TL494 is made to be stopped.

Negative pressure sampling pulse oscillation module overvoltage crowbar operation principle samples the protection basic phase of circuit theory with positive pressure Together, compared with positive pressure samples protection circuit, negative pressure sampling protection circuit increases one between filter circuit and voltage comparator A electric pressure converter the converting negative pressure of sampling at corresponding positive pressure, then is transmitted to the in-phase input end and benchmark of voltage comparator Voltage compares, to control the working condition of TL494.

The above is the utility model preferred embodiment, for the ordinary skill in the art, according to this reality With novel introduction, in the case where not departing from the principles of the present invention with spirit, the change that is carried out to embodiment is repaiied Change, replace and modification is still fallen within the scope of protection of the utility model.

Claims (2)

1. a kind of excitation power supply, which is characterized in that on-chip power power protecting circuit, 8 ports of sucker U1 and 11- in circuit 12 ports connect+12V voltages simultaneously, and+12V voltages are grounded through capacitance C3 simultaneously, and the ports 14-15 and 2 ports of chip U1 are simultaneously It is grounded through slide rheostat R8,3 ports of chip U1 connect the contact end of slide rheostat R3,1 port of chip U1,7 ports, 13 Port and 16 ports are grounded simultaneously, and 5 ports of chip U1 are grounded through capacitance C2, and 6 ports of chip U1 are grounded through resistance R7, chip 4 ports of U1 connect 1 port of chip U2, while 4 ports of chip U1 meet 3 ports of chip U2, diode D1 through diode D1 The ports 9-10 of connecting resistance R4, chip U1 connect output end through resistance R5 simultaneously, while resistance R5 is grounded through resistance R6, chip U2's 8 ports connect+12V voltages, and the 4 ports ground connection of chip U2, resistance R4 is respectively through capacitance C1 and resistance R3 ground connection, while resistance R4 is passed through Resistance R2 connects the anode of battery, while the cathode ground connection of battery.

2. a kind of excitation power supply according to claim 1, which is characterized in that the chip U1 fixes frequency using TL494 types Rate pulse-width modulation circuit, the LM358 type dual operational amplifiers of chip U2.