CN205786935U - A kind of two-way monitoring power-fail detection circuit - Google Patents

Abstract

The utility model discloses a kind of two-way monitoring power-fail detection circuit, including an ADM708AR chip U2, operational amplifier chip U1, ten resistance R1 to R10, two electric capacity C1 and C2 and a diode D1.This utility model utilizes the down Monitor Unit of ADM708AR chip self and restarts output function and detect two-way power supply simultaneously, simple circuit, cost is relatively low and can reflect power supply power-fail situation in real time, and after power up normal power supply, 200ms can eliminate fault-signal, substantially increases the reliability of product.

Description

A kind of two-way monitoring power-fail detection circuit

Technical field

This utility model relates to the power-fail detection circuit of active power filtering interiors of products, particularly relates to a kind of two-way monitoring power down Testing circuit.

Background technology

Power-fail detection circuit is a requisite part in active power filtering product, and it can detect that active power filtering produces in time Accessory power supply in product is the most normal, it is ensured that the primary condition maintaining product normally to work is reliable, has and extremely can feed back in time, side Just staff investigates fault in time, it is to avoid because power down causes bigger fault.

Accessory power supply in active power filtering product has multiple, and all takes on vital effect.Wherein simulation+15VA Power with the amplifier chip that-15VA is all sample circuits and comparator.If this unexpected power down of two-way power supply may be led in Yun Hanging Send a telegraph road sample error, and feed back and circuit will be made normally to work less than correct signal even to damage.Such as DC side electricity Pressure sampling is too low, and the electric capacity final overvoltage that do not stops to charge will be caused to make capacitor damage；Or it is that output current sample is too low, will lead Cause output is transfinited, fuse, IGBT constant power device failure etc..Thus this two-way power supply must be monitored, and feed back in time Corresponding protective measure is made, it is to avoid fault occurs to DSP.The most conventional power-fail detection circuit is the most cumbersome and complicated, nothing Method realizes two-way effective monitoring simultaneously.

Summary of the invention

The technical problems to be solved in the utility model is that existing power-fail detection circuit is the most cumbersome and complicated, it is impossible to Shi Shixian two-way effective monitoring.

For solving above-mentioned technical problem, the technical solution adopted in the utility model is: a kind of two-way monitoring detection of power loss electricity Road, including an ADM708AR chip U2, operational amplifier chip U1, ten resistance R1 to R10, two electric capacity C1 and C2 With a diode D1；One termination+15VA the power supply of resistance R1, one end of another termination capacitor C1 and one end of R2；C1's Another termination simulation ground；The other end of R2 and 2 feet of chip ADM708AR, one end of resistance R3, and the anode of diode D1 It is connected；Another termination simulation ground of resistance R3;The cathode resistor of diode D1 meets analog power+5VA；Chip 3 foot connects numeral Ground；One termination-15VA the power supply of R10, one end of another termination capacitor C2 and one end of R8；Another termination simulation ground of C2； The other end of R8 is connected with 5 feet of one end of R9 and chip U1；Another termination simulation ground of resistance R9;6 feet of chip U1 connect One end of resistance R6 and 7 feet of chip U1；One end of another termination R7 of R6 and 2 feet of chip U1；3 feet of chip U1 are through resistance R5 ground connection simulation ground;The other end of resistance R7 is coupled with 1 foot of chip U1 and 4 feet of chip U2；8 feet of chip U1 and U1's 4 feet connect+15VA and-15VA power supply respectively；5 feet of chip U2 connect 1 foot of chip U2;One end of the 7 foot connecting resistance R4 of chip U2, The other end of R4 accesses DSP.

This utility model application ADM708AR chip ,+15VA the power supply that a road need to be detected through electric resistance partial pressure to chip power supply, -15VA the digital power that another road need to be detected through dividing potential drop, follow, reverse ratio links such as row, be changed to suitable positive voltage and access Down Monitor Unit input, utilizes the down Monitor Unit of chip self and restarts output function and detect two-way power supply simultaneously.If chip is electric Source or monitoring power input power down, restart outfan and all can provide low level report fault, until service restoration normally after After 200 milliseconds, restart outfan and just can export high level to show that power supply is normal.

Further, described resistance R1 is 10 Ω, and R2 is 887 Ω, and R3 is 510 Ω, and R4 is 10K Ω, and R5 is 2K Ω, and R6 is 2K Ω, R7 be 2K Ω, R8 be 8.66K Ω, R9 be 1K Ω, R10 is 10 Ω;Electric capacity C1 Yu C2 is 1nF.

The utility model has the advantages that: simple circuit, a circuit can detect two-way power supply simultaneously, and cost is relatively low and energy is real Shi Fanying power supply power-fail situation, after power up normal power supply, 200ms can eliminate fault-signal, and substantially increase product can By property.

Accompanying drawing explanation

Fig. 1 is electrical block diagram of the present utility model.

Detailed description of the invention

Below in conjunction with the accompanying drawings this utility model technology contents is explained:

As it is shown in figure 1, this utility model one power supply power-fail testing circuit, including a voltage monitoring chip, a fortune Calculate amplifier chip and ten resistance, two electric capacity.A piece of voltage monitoring chip U2 is ADM708AR；One operational amplifier core Sheet U1 is LM258, and resistance R1 is 10 Ω, and R2 is 887 Ω, and R3 is 510 Ω, and R4 is 10K Ω, and R5 is 2K Ω, and R6 is 2K Ω, and R7 is 2K Ω, R8 be 8.66K Ω, R9 be 1K Ω, R10 is 10 Ω;Electric capacity C1 Yu C2 is 1nF.One termination+15VA the electricity of resistance R1 Source, one end of another termination capacitor C1, and one end of R2；Another termination AGND of C1；The other end of R2 and chip 2 feet of ADM708AR, one end of resistance R3, and the anode of diode D1 are connected；Another termination AGND of resistance R3;Two poles The cathode resistor of pipe D1 meets analog power+5VA；Chip 3 foot meets digitally (DGND).One termination-15VA the power supply of R10, another One end of termination capacitor C2, and one end of R8；Another termination AGND of C2；The other end of R8 and one end of R9 and chip U1 5 feet be connected；Another termination AGND of resistance R9;One end of chip 6 foot connecting resistance R6 and chip 7 foot；Another termination R7 of R6 One end and chip 2 foot；Chip 3 foot is through resistance R5 ground connection (AGND);The other end of resistance R7, receives 1 foot of chip U1 simultaneously With chip U2(ADM708AR) 4 feet (PFI)；8 feet of chip U1 and 4 feet connect+15VA and-15VA power supply respectively.The 5 of chip U2 Foot PFO(power down exports) meet the 1 foot MR (manually restarting input) of chip U2;One end of the 7 foot connecting resistance R4 of chip U2, R4's is another DSP is accessed in one end.

Claims (2)

1. a two-way monitoring power-fail detection circuit, is characterized in that: include an ADM708AR chip U2, an operational amplifier Chip U1, ten resistance R1 to resistance R10, two electric capacity C1 and electric capacity C2 and a diode D1；

One termination+15VA the power supply of resistance R1, one end of another termination capacitor C1 and one end of R2；Another termination of electric capacity C1 Simulation ground；The anode of the other end of resistance R2 and 2 feet of chip ADM708AR, one end of resistance R3, and diode D1 is connected Connect；Another termination simulation ground of resistance R3;The cathode resistor of diode D1 meets analog power+5VA；3 feet of chip U2 connect numeral Ground；One termination-15VA the power supply of R10, one end of another termination capacitor C2 and one end of resistance R8；Another termination of electric capacity C2 Simulation ground；The other end of resistance R8 is connected with one end of resistance R9 and 5 feet of chip U1；Another termination simulation of resistance R9 Ground;One end of the 6 foot connecting resistance R6 of chip U1 and 7 feet of chip U1；One end of the other end connecting resistance R7 of resistance R6 and chip 2 feet of U1；3 feet of chip U1 are through resistance R5 ground connection simulation ground;The other end of resistance R7 is coupled with 1 foot and the chip of chip U1 4 feet of U2；8 feet of chip U1 and 4 feet of chip U1 connect+15VA and-15VA power supply respectively；5 feet of chip U2 connect the 1 of chip U2 Foot;One end of the 7 foot connecting resistance R4 of chip U2, the other end of resistance R4 accesses DSP.

A kind of two-way monitoring power-fail detection circuit the most according to claim 1, is characterized in that: described resistance R1 is 10 Ω, R2 are 887 Ω, and R3 is 510 Ω, and R4 is 10K Ω, and R5 is 2K Ω, and R6 is 2K Ω, R7 be 2K Ω, R8 be that 8.66K Ω, R9 are 1K Ω, R10 are 10 Ω;Electric capacity C1 Yu C2 is 1nF.