CN2678222Y

CN2678222Y - Load and power-supply control protection circuit

Info

Publication number: CN2678222Y
Application number: CN 200320118688
Authority: CN
Inventors: 孙海良
Original assignee: ZHUHAI SANCHAO MOULD CO Ltd
Current assignee: ZHUHAI SANCHAO MOULD CO Ltd
Priority date: 2003-12-01
Filing date: 2003-12-01
Publication date: 2005-02-09
Anticipated expiration: 2013-12-01

Abstract

The utility model discloses a load and power-supply control protection circuit. The utility model aims to provide the load and power-supply control protection circuit which has small volume for a sampling resistor, less energy consumption, low heating value and light weight. The load and power-supply control protection circuit comprises a comparator integrated circuit module (1), a circuit co-grounding conducting wire copper foil (4) on a printed circuit board, a protection control circuit (3) and a sampling electric resistor (2), wherein, the sampling resistor (2) is one section of the circuit co-grounding conducting wire copper foil (4) on the printed circuit board. The load and power-supply control protection circuit can be used extensively in the fields of aviation models, navigation models, especially the minisize equipment, etc.

Description

A kind of load and power supply control protection electric circuit

Technical field

The utility model relates to a kind of load and power supply control protection electric circuit.

Background technology

At present; switching power circuit, overload short-circuit protection circuit and other are used for circuit that load and power supply are controlled and protected; their majorities are the control signal source with the current in loop changing value; utilize sample resistance to be connected in the loop; when electric current in the loop will produce voltage drop during by sample resistance on sample resistance; pick up this voltage drop and be fed to the control signal of control circuit input as control circuit, control circuit is signal strong, weak or have, do not have the running status of going to control power supply or load according to this.In the circuit of continuing to use now and product; the most of volumes of sample resistance in this class sample circuit are big; power consumption is big; caloric value is big; because the electric current in whole loop is by this resistance; so much be subjected to volume and energy consumption; weight limits and assembling are compact; the product that is difficult for heat radiation can not use this type of circuit; even give up the protection controlling schemes; for example: aviation; in the product of model ship aspect; especially microcomputer; the problem of this respect just is not resolved always; a tree name is not exclusively understood; prototype is for satisfying power-efficient on the domestic and international market; weight; special technical requirements such as volume; can only cast out the load overcurrent; short-circuit protection function, motor takes place to burn when unusual in the tolerance motor; speed regulator etc.In sum, exist in this type of existing load and the power supply control protection electric circuit that the sample resistance volume is big, energy consumption is big, caloric value is many, the defective of Heavy Weight, limited scope and the aspect used.

The utility model content

Technical problem to be solved in the utility model is to overcome the deficiencies in the prior art, provides that a kind of sample resistance volume is little, energy consumption is little, caloric value is few, lightweight load and power supply control protection electric circuit.

The technical scheme that the utility model adopted is: the utility model comprises circuit lead Copper Foil, protection control circuit, the sample resistance altogether on comparator integrated circuit modules, the printed circuit board (PCB); the 1st pin of described comparator integrated circuit modules is connected with the input of protection control circuit; described sample resistance is circuit one section on the lead Copper Foil altogether on the printed circuit board (PCB), and described sample resistance is connected with the signal input part of described comparator integrated circuit modules.

The beneficial effects of the utility model are: since adopt original circuit on the printed circuit board (PCB) altogether one section copper resistance on the lead Copper Foil as sample resistance, make and saved the sample resistance that volume is big, power consumption is big, caloric value is big in the circuit, thus product can accomplish that volume is little, energy consumption is little, caloric value is few, in light weight.

Description of drawings

Fig. 1 is the utility model electricity theory diagram;

Fig. 2 is the utility model circuit diagram.

Embodiment

As shown in Figure 1; the utility model comprises circuit lead Copper Foil 4, protection control circuit 3, the sample resistance 2 altogether on comparator integrated circuit modules 1, the printed circuit board (PCB); the output of described comparator integrated circuit modules 1 is connected with the input of protection control circuit 3, and described sample resistance 2 is connected with the signal input part of described comparator integrated circuit modules 1.Sample resistance 2 on the described printed circuit board (PCB) is not the circuit part that specialized designs increases; but original circuit one section on the lead Copper Foil 4 altogether on the printed circuit board (PCB); the copper resistance of this section Copper Foil as an invisible sample resistance; current in loop certainly leads to voltage drop by this section Copper Foil; though copper resistance is little; a little less than the pressure drop; but amplification through comparator integrated circuit modules 1; also can satisfy the input intensity requirement of general control circuit; signal after the amplification is delivered to the input of protection control circuit 3 from first pin output of comparator integrated circuit modules 1 as control signal; power supply can be common stabilized voltage power supply or Switching Power Supply among the figure; it also can be battery; load is generally switching tube or d.c. motor for protection and controlling object.

Fig. 2 is the d.c. motor speed regulator finished product circuit diagram on the present embodiment aviation and navigation prototype; in this circuit diagram; copper resistance R GND is exactly the sample resistance 2 of lead altogether on the printed circuit board (PCB); described sample resistance 2 links to each other with the 3rd pin of comparator integrated circuit modules 1 by resistance R 15; the 2nd pin of described comparator integrated circuit modules 1 by resistance R 14 together ground wire link to each other, the 1st pin of described comparator integrated circuit modules 1 directly links to each other by the 1st pin of the single-chip microcomputer IC2 in lead and the protection control circuit 3.Its sampling and Control work principle are: when the complete machine electric current passes through described sample resistance 2; the 3rd pin of described comparator integrated circuit modules 1 is delivered in the voltage drop of Chan Shenging thereon by described R15; through the comparator circuit voltage amplification; signal voltage after the amplification is delivered to the 1st pin of described single-chip microcomputer IC2 from the 1st pin of described comparator integrated circuit modules 1; described single-chip microcomputer IC2 is under the cooperation of software program; parameter by this applied signal voltage; export the state that each road unlike signal removes to control power supply or motor respectively, reach under circuit overcurrent or short-circuit conditions protection and control power supply and load.The control circuit 3 of protection described in the figure is d.c. motor speed governing, protection, control circuits of continuing to use now, and the IC2 of single-chip microcomputer described in the figure is universal single-chip microcomputer, and its model is: EM78P153E.

Claims

1, a kind of load and power supply control protection electric circuit; it comprises circuit lead Copper Foil (4), protection control circuit (3), sample resistance (2) altogether on comparator integrated circuit modules (1), the printed circuit board (PCB); the 1st pin of described comparator integrated circuit modules (1) is connected with the input of protection control circuit (3); it is characterized in that: described sample resistance (2) is circuit one section on the lead Copper Foil (4) altogether on the printed circuit board (PCB), and described sample resistance (2) is connected with the signal input part of described comparator integrated circuit modules (1).