CN202330520U

CN202330520U - High-voltage isolation sampling circuit

Info

Publication number: CN202330520U
Application number: CN2011204274816U
Authority: CN
Inventors: 陈效敏
Original assignee: Guangdong Midea Electric Appliances Co Ltd
Current assignee: Midea Group Co Ltd
Priority date: 2011-11-02
Filing date: 2011-11-02
Publication date: 2012-07-11
Anticipated expiration: 2021-11-02

Abstract

The utility model relates to a high-voltage isolation sampling circuit. The high-voltage isolation sampling circuit is characterized by comprising a voltage division circuit, a single chip microcomputer, a photoelectric isolation circuit and a filter circuit, wherein the voltage division circuit receives and divides a direct current high voltage from a load; the single chip microcomputer receives and processes component voltages output by the voltage division circuit; the photoelectric isolation circuit receives and carries out photoelectric isolation on signals output by the single chip microcomputer; and the filter circuit receives and filters signals output by the photoelectric isolation circuit, and then outputs the signals to a PI (Proportional Integral) adjusting circuit. The high-voltage isolation sampling circuit has the advantages of simple structure, high precision, good degree of linearity and anti-interference performance and particularly suitability for being used for a direct current stabilized power supply supplying high power.

Description

High-tension isolation sample circuit

Technical field

The utility model relates to the detection technique association area, the high-tension isolation sample circuit of particularly a kind of detection, feedback DC voltage.

Background technology

The applied environment of industrial control system is very abominable, generally all can have interference such as high pressure, big electric current, so the signal sampling of Industry Control can be imported MCU after generally all will passing through isolation; It is necessary in Industry Control, isolating, if do not do isolation, when equipment ground is bad, be easy to go wrong, and light data transmission fault then, heavy then MCU is damaged.Existing buffer circuit adopts transformer and capacitive coupling to isolate, and its volume is big, expensive, and buffer circuit is complicated, poor anti jamming capability.

Summary of the invention

The utility model purpose is to provide a kind of high-tension isolation sample circuit, and its sampling is accurate, no phase deviation, and isolation performance is good, and is safe in utilization, can utilize low-cost device general on the market, and cost is low.

In order to achieve the above object; The technical scheme of the utility model is: a kind of high-tension isolation sample circuit; It is characterized in that comprising bleeder circuit, single-chip microcomputer, photoelectric isolating circuit and filtering circuit; Wherein said bleeder circuit receives from the high direct voltage voltage of load and carries out dividing potential drop; Said single-chip microcomputer receives from the branch pressure voltage of bleeder circuit output and handles, and said photoelectric isolating circuit receives from the signal of single-chip microcomputer output and carries out photoelectricity and isolate, and said filtering circuit receives from the signal of photoelectric isolating circuit output and after carrying out filtering and exports to the PI regulating circuit.

Said singlechip control chip, crystal oscillator, second electric capacity, the 3rd electric capacity, the 6th resistance and the 7th resistance; 11 pins of wherein said said crystal oscillator one end ground connection PGND and control chip, the two ends of said the 7th resistance are attempted by between 12,13 pins of other two ends and control chip of crystal oscillator; 1 pin of one termination control chip of said the 6th resistance, another termination WV+VPP; Second electric capacity and a termination WV+VPP after the 3rd electric capacity is parallelly connected, other end ground connection.

Said bleeder circuit comprises first to the 5th resistance and first electric capacity, the high direct voltage of a termination load after said first to fourth resistance is connected successively, other end ground connection; One termination, second resistance of said the 5th resistance and the series connection point of the 3rd resistance, the other end connect an end of first electric capacity and 35 pins of control chip, the other end ground connection of said first electric capacity respectively.

Said photoelectric isolating circuit comprises optocoupler and the 8th resistance, and 1 pin of wherein said optocoupler meets WV+VPP, and 3 pin connect 19 pins of control chip through the 8th resistance; Said filtering circuit comprises the 9th resistance, the tenth resistance, the 4th electric capacity, the 5th electric capacity and electrochemical capacitor; An end meets 6 pin of optocoupler, an end and the WV+5V of the tenth resistance, other end ground connection GND1 respectively after wherein said the 4th electric capacity and the electrochemical capacitor parallel connection; The other end of said the tenth resistance is the output terminal of filtering circuit and connects an end of the 9th resistance and an end of the 5th electric capacity respectively; 5 pin of another termination optocoupler of said the 9th resistance, 4 pin of another termination optocoupler of said the 5th electric capacity and ground connection GND1.

The utility model advantage compared with prior art is: simple in structure, precision is high, the linearity and anti-interference are good, is particularly suitable for providing the use of powerful D.C. regulated power supply, can utilize low-cost device general on the market, cost is low.

Description of drawings

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

Fig. 2 is the circuit theory diagrams of the utility model;

The functional-block diagram of an embodiment of Fig. 3 the utility model.

Embodiment

Below in conjunction with accompanying drawing and specific embodiment the utility model is done further detailed explanation.

As shown in Figure 1; A kind of high-tension isolation sample circuit; The utility model characteristics are to comprise bleeder circuit 1, single-chip microcomputer 2, photoelectric isolating circuit 3 and filtering circuit 4; Wherein said bleeder circuit 1 receives from the high direct voltage voltage of load and carries out dividing potential drop; Said single-chip microcomputer 2 receives from the branch pressure voltage of bleeder circuit 1 output and handles, and said photoelectric isolating circuit 3 receives from the signal of single-chip microcomputer 2 outputs and carries out photoelectricity and isolate, and said filtering circuit 4 receives from the signal of photoelectric isolating circuit 3 outputs and after carrying out filtering and exports to the PI regulating circuit.Its principle of work is: high direct voltage is through after bleeder circuit 1 dividing potential drop; Be input to voltage signal in the single-chip microcomputer 2; The sampled voltage signal is exported in programmed control through single-chip microcomputer 2; Obtain desired signal behind buffer action and the filtering circuit 4 of sampled voltage signal through photoelectric isolating circuit 3, can avoid receiving various electrical interference like this.

In the present embodiment, said single-chip microcomputer 2 control chip IC1, crystal oscillator X1, second capacitor C 2, the 3rd capacitor C 3, the 6th resistance R 6 and the 7th resistance R 7; 11 pins of wherein said said crystal oscillator X1 one end ground connection PGND and control chip IC1, the two ends of said the 7th resistance R 7 are attempted by between 12,13 pins of other two ends and control chip IC1 of crystal oscillator X1; 1 pin of one termination control chip IC1 of said the 6th resistance R 6, another termination WV+VPP; Second capacitor C 2 and the 3rd capacitor C 3 parallelly connected back one termination WV+VPP, other end ground connection.Said bleeder circuit 1 comprises first to the 5th resistance R 1-R5 and first capacitor C 1, and the high direct voltage of a termination load was input port A after said first to fourth resistance R 1-R4 connected successively, other end ground connection; One termination, second resistance R 2 of said the 5th resistance R 5 and the series connection point of the 3rd resistance R 3, the other end connects an end of first capacitor C 1 and 35 pins of control chip IC1, the other end ground connection of said first capacitor C 1 respectively.Said photoelectric isolating circuit 3 comprises optocoupler IC2 and the 8th resistance R 8, and 1 pin of wherein said optocoupler IC2 meets WV+VPP, and 3 pin connect 19 pins of control chip IC1 through the 8th resistance R 8.Said filtering circuit 4 comprises the 9th resistance R 9, the tenth resistance R 10, the 4th capacitor C 4, the 5th capacitor C 5 and electrochemical capacitor E1; An end meets 6 pin of optocoupler IC2, an end and the WV+5V of the tenth resistance R 10, other end ground connection GND1 respectively after wherein said the 4th capacitor C 4 and the electrochemical capacitor E1 parallel connection; The other end of said the tenth resistance R 10 connects an end of the 9th resistance R 9 and an end of the 5th capacitor C 5 respectively, and this end is that the output terminal of filtering circuit 4 is output terminal B; 5 pin of another termination optocoupler IC2 of said the 9th resistance R 9,4 pin and the ground connection GND1 of another termination optocoupler IC2 of said the 5th capacitor C 5.During work; High direct voltage is through after the first to fourth resistance R 1-R4 dividing potential drop effect; Be input to voltage signal among the control chip IC1; Control chip IC1 sampled voltage signal output, obtains desired signal behind buffer action and the filtering circuit 4 of sampled voltage signal through optocoupler IC2 through programmed control, the input circuit part of optocoupler IC2 partly adopt independent current source with output loop and connect respectively different " "; Even distant signal transmission so also can avoid receiving various electrical interference.

As shown in Figure 3, it is a functional-block diagram of present embodiment, and it can realize three-phase controlled rectification and fixed ampllitude.The output terminal B that its mesohigh is isolated sample circuit is connected with an input end of PI regulating circuit; The output terminal of PI regulating circuit connects rectifier control circuit 3; The load of rectifier control circuit output termination, load output termination high pressure is isolated the input end A of sample circuit.

Claims

1. high-tension isolation sample circuit; It is characterized in that comprising bleeder circuit (1), single-chip microcomputer (2), photoelectric isolating circuit (3) and filtering circuit (4); Wherein said bleeder circuit (1) receives from the high direct voltage voltage of load and carries out dividing potential drop; Said single-chip microcomputer (2) receives from the branch pressure voltage of bleeder circuit (1) output and handles; Said photoelectric isolating circuit (3) receives from the signal of single-chip microcomputer (2) output and carries out photoelectricity and isolate, and said filtering circuit (4) receives from the signal of photoelectric isolating circuit (3) output and after carrying out filtering and exports to the PI regulating circuit.

2. high-tension isolation sample circuit according to claim 1 is characterized in that said single-chip microcomputer (2) control chip (IC1), crystal oscillator (X1), second electric capacity (C2), the 3rd electric capacity (C3), the 6th resistance (R6) and the 7th resistance (R7); 11 pins of wherein said said crystal oscillator (X1) end ground connection PGND and control chip (IC1), the two ends of said the 7th resistance (R7) are attempted by between 12,13 pins of other two ends and control chip (IC1) of crystal oscillator (X1); 1 pin of one termination control chip (IC1) of said the 6th resistance (R6), another termination WV+VPP; The parallelly connected back of second electric capacity (C2) one termination WV+VPP with the 3rd electric capacity (C3), other end ground connection.

3. high-tension isolation sample circuit according to claim 1 and 2; It is characterized in that said bleeder circuit (1) comprises first to the 5th resistance (R1)-(R5) and first electric capacity (C1); The high direct voltage of a termination load after said first to fourth resistance (R1)-(R4) is connected successively, other end ground connection; One termination, second resistance (R2) of said the 5th resistance (R5) and the series connection point of the 3rd resistance (R3), the other end connects an end of first electric capacity (C1) and 35 pins of control chip (IC1), the other end ground connection of said first electric capacity (C1) respectively.

4. high-tension isolation sample circuit according to claim 1 and 2; It is characterized in that said photoelectric isolating circuit (3) comprises optocoupler (IC2) and the 8th resistance (R8); 1 pin of wherein said optocoupler (IC2) meets WV+VPP, and 3 pin connect 19 pins of control chip (IC1) through the 8th resistance (R8); Said filtering circuit (4) comprises the 9th resistance (R9), the tenth resistance (R10), the 4th electric capacity (C4), the 5th electric capacity (C5) and electrochemical capacitor (E1); Wherein said the 4th electric capacity (C4) and electrochemical capacitor (E1) parallel connection back one end meet 6 pin of optocoupler (IC2), an end and the WV+5V of the tenth resistance (R10), other end ground connection GND1 respectively; The other end of said the tenth resistance (R10) is the output terminal of filtering circuit (4) and connects an end of the 9th resistance (R9) and an end of the 5th electric capacity (C5) respectively; 5 pin of another termination optocoupler (IC2) of said the 9th resistance (R9), 4 pin and the ground connection GND1 of another termination optocoupler (IC2) of said the 5th electric capacity (C5).