CN101408584B

CN101408584B - Apparatus for detecting multiplex fuse wire signal

Info

Publication number: CN101408584B
Application number: CN2008102166701A
Authority: CN
Inventors: 吴连日
Original assignee: Emerson Network Power Co Ltd
Current assignee: Vertiv Tech Co Ltd
Priority date: 2008-10-09
Filing date: 2008-10-09
Publication date: 2011-07-27
Anticipated expiration: 2028-10-09
Also published as: CN101408584A

Abstract

The invention relates to a device used for detecting multipath fuse wire signals, comprising an attenuation sampling circuit used for carrying out attenuation sampling toward input signals and also a clamp circuit connected with the attenuation sampling circuit and used for limiting the signal received from the sampling circuit within a preset range and outputting the signal. The device has no blind detection area, has strong anti-interference capacity and can be applicable to a situation without a storage battery connected.

Description

Be used for the device that multiplex fuse wire signal detects

Technical field

The present invention relates to a kind of pick-up unit, relate in particular to the device that multichannel battery fuse signal detects in the power supply system for communications or the solar energy system.

Background technology

In the power supply system for communications or solar energy system, the break-make of battery fuse detects general based under the situation that two-way or the fuse more than the two-way are arranged, and at present main testing circuit as shown in Figure 1.We are example with the 48V power supply system for communications or solar energy system, when the two-way fuse need carry out the break-make detection, because the highest even charging voltage of accumulator is about 57V, voltage difference between the two-way accumulator then may be ± 57V, this is exactly the input voltage range that fuse detects input end (FUSE end among Fig. 1) simultaneously, this input voltage is through first, two divider resistance R1,20 times of R2 dividing potential drop decay, this is because the modulus conversion chip and the cpu power of back are 3V's, so first reference power supply (VREF) voltage also is 3V, but amplifier is output as ± 3V, need positive-negative power, simultaneously the amplifier power supply generally want ± 5V and more than.Like this, the basic functional principle of this circuit is: may be 20 times of the signal attenuations of ± 57V with one, transfer signal to a stable ± 3V signal by a follower, again the dividing potential drop by the resistance R 5 and the second pull-up resistor R6 and on draw, the digitized signal for the treatment of that transfers into a 0～3V to is used for back level analog to digital conversion and signal analysis and processing.(this voltage is slightly different because of different manufacturers when fuse input voltage ± 0.5V under the normal condition, but be the hundreds of millivolt) just think that fuse is disconnected, think that less than about ± 0.35V fuse is normal, that is to say in the traditional circuit, input ± have only among the 57V low side ± 0.5V is a useful signal with interior signal, remaining is a garbage signal, output treats to have only 1.5V in digitized 0～3V signal near (usually R5=R6) ± 0.0125V is a useful signal with interior signal, useful signal and garbage signal ratio are minimum like this, and are disturbed easily.For preventing vibration, need a return difference simultaneously, be generally ± 0.35V, this corresponding scope only be ± 0.00875V that this also is easy to be disturbed, and is also very little toward the space of decline more simultaneously in the output signal.For this reason, useful signal can't diminish again, in fact the voltage difference between fuse is much smaller than ± 0.5V, and signal is less than 50mV, when fuse breaks under the situation that fuse is logical under the normal condition, as battery tension and busbar pressure reduction less than ± 0.5V scope, foregoing circuit just can't detect, and just has a bigger detection blind area, as reducing this blind area, just must improve the ratio of accuracy of detection and useful signal, this be above-mentioned traditional circuit insurmountable.

In addition, when not connecing accumulator, the input fuse is that normal and the above-mentioned traditional circuit of abnormal conditions are to distinguish, fuse normal during with disconnection the amplifier input end be 0, output voltage is identical.

In sum, there is following shortcoming in the above-mentioned traditional circuit:

1, needs three kinds of power supplys.

2, signal to noise ratio (S/N ratio) is little, antijamming capability a little less than.

3, useful signal is too little with the garbage signal ratio in the output signal.

4, the blind area that can't detect is bigger.

5, the input fuse is disconnected when not connecing accumulator can't detect.

Summary of the invention

For solving the shortcoming of above-mentioned traditional circuit, we carry out deep research according to the characteristics of circuit, have designed the device circuit of a kind of new scheme and implementation.We are according to the characteristics of the circuit of above-mentioned fuse detection, promptly in the input ± 57V signal useful signal have only positive and negative a few volt with interior (if any have only ± 0.5V), we can will carry out wave absorption greater than the input signal beyond the useful signal or directly bypass, only to the useful signal Filtering Processing of taking a sample, useful signal is main in the output signal like this, the signal to noise ratio (S/N ratio) of useful signal also significantly improves in the output signal, has strengthened the antijamming capability of useful signal.According to above analysis, the fuse detector that the present invention adopts comprises and being used for the decay decay sample circuit of sampling of input signal, also comprise the clamp circuit that is connected with described decay sample circuit, be used for the signal limiting also output in predetermined scope that to be received from described decay sample circuit.

Because the clamping action of clamp circuit in this pick-up unit, the input useful signal of fuse can significantly not decayed, thereby has improved the ratio of useful and garbage signal in the output signal; Simultaneously, because the clamping action of clamp circuit, the scope that makes input fault detect reduces greatly, thereby has avoided the detection blind area.

Preferably, the device that is used for the multiplex fuse wire signal detection of the present invention also comprises the filtering circuit that is connected with described clamp circuit, is used for filtering the noise of the signal that receives from described clamp circuit.

Preferred again, of the present inventionly be used for the device that multiplex fuse wire signal detects and also comprise the voltage follower circuit that is connected between described decay sample circuit and the described clamp circuit, be used for stablizing from the signal of described decay sample circuit and export described clamp circuit to

Description of drawings

Fig. 1 is the testing circuit schematic diagram of prior art;

Fig. 2 is the testing circuit schematic diagram of the specific embodiment of the invention 1;

Fig. 3 is the testing circuit schematic diagram of the specific embodiment of the invention 2;

Fig. 4 is the testing circuit schematic diagram of the specific embodiment of the invention 3;

Fig. 5 is the testing circuit schematic diagram of the specific embodiment of the invention 4.

Embodiment

Below we contrast accompanying drawing and describe (wherein D1-1 and D1-2 are two diodes in the same encapsulation) in conjunction with instantiation:

Embodiment one

At first circuit is described, as shown in Figure 2, first and second divider resistance R1, R2 carry out proportional distribution to input signal; Resistance R 4 is first pull-up resistors, makes the input signal can compatible positive and negative input; Useless composition in the input signal is carried out wave absorption to diode D1 (comprising the first diode D1-1 and the second diode D1-2) or bypass is used, the first diode D1 can strengthen the antijamming capability in the input signal simultaneously, filters out the electromagnetic interference (EMI) (as surge, static, thunderbolt etc.) of positive and negative two directions; Resistance R 5 has been formed low-pass filtering, the high frequency noise in the trap signal with capacitor C 1.

In this pick-up unit as shown in Figure 2, the input useful signal of fuse can significantly not decayed, as the input useful signal be ± during 1V, we only intercepting ± 10V (this scope is desirable littler also can get greatly again, only is to illustrate herein.) input signal, our power taking resistance R1=3R2=3R4 draws on the dividing potential drop by resistance R 1 and R2 when input end FUSE is 10V and the first pull-up resistor R4, can make common port V1 voltage is that (forward conduction voltage drop of supposition D1-2 is 0.3V about 2.7V.); When be input as-dividing potential drop by first and second divider resistance R1, R2 during 10V and the first pull-up resistor R4 on draw, (forward conduction voltage drop of supposition D1-1 is 0.3V for about-0.14V can to make common port V1 voltage.When CPU or dsp chip or other analog to digital conversion interface were restricted to the input negative voltage, negative pressure can not be too low in addition.)。When input voltage is higher than 10V when above, can make about the highest 3.3V of remaining of common port V1 voltage by the first divider resistance R1 and the second diode D1-2, when input be lower than-during 10V, can make about minimum the remaining of common port V1 voltage-0.3V by the first divider resistance R1 and the first diode D1-1, like this, when the input useful signal be ± during 0.5V, output voltage corresponds to 1.214V～1.357V, useful signal and garbage signal compare traditional circuit and have improved nearly 6 times even higher, antijamming capability also correspondingly greatly improves, under the identical noise situation, nearly 6 times even higher of the also corresponding raising of signal to noise ratio (S/N ratio).

In the circuit of this embodiment, entire circuit only needs a reference power supply.

Level change-over circuit after same, can the entirely true output voltage range of distinguishing under the situation for ± 0.005V as traditional circuit, corresponding input return difference scope then be ± 0.2V about, the input fault sensing range then must greater than ± more than the 0.25V, the still bigger blind area of existence.But for novel circuit, as with same late-class circuit, corresponding input return difference scope then can be for about ± 35mV, the input fault sensing range is then above just passable greater than ± 50mV, because there is the conduction voltage drop of self in fuse, generally be tens millivolts to the maximum, in this case, novel circuit has not just been tested the blind area.

When not connecing accumulator, if fuse is normal, the value of common port V1 is about 1.285V in addition, and in the scope of 1.214V～1.357V, novel circuit can not alarmed; When not connecing accumulator, if fuse has broken, the value of common port V1 is about 1.5V, and outside 1.214V～1.357V scope, circuit will send the disconnected alarm of fuse, tallies with the actual situation.

As seen, new fuse detection scheme and circuit arrangement have not only solved the deficiency in the traditional circuit, also have more performance, lower cost.

Embodiment two

When better, the circuit of embodiment one further can be reduced to circuit shown in Figure 3 for input signal.Even resistance R among Fig. 35 also can be saved.

Embodiment three

For traditional circuit, we also can be optimized, as shown in Figure 4, its course of work is: at first by divider resistance R1, the bleeder circuit that R2 forms is to the input signal sampling that decays, again by the emitter follower burning voltage, adopt then by first, two diode D1-1, the clamp circuit that the cathode power supply of D1-2 and emitter follower in-phase input end+VCC1 constitutes is limited to the scope of output signal in the predetermined scope, at last, carry out filtering and pass through the second reference power supply VREF ' by the filtering circuit that constitutes by resistance R 5 and capacitor C 1, draw back output on the second pull-up resistor R6.

Embodiment four

As shown in Figure 5, the difference of itself and previous embodiment three is: described clamp circuit is made of first and second diode D1-1, D1-2 and described second reference power supply (VREF ').

Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention; without departing from the inventive concept of the premise; can also make some simple deduction or replace; realize clamp function such as adopting triode etc. to form described clamp circuit together, all should be considered as belonging to protection scope of the present invention with power supply.

Claims

1. one kind is used for the device that multiplex fuse wire signal detects, comprise be used for to input signal decay the sampling the decay sample circuit, it is characterized in that: also comprise the clamp circuit that is connected with described decay sample circuit, be used for the signal limiting also output in predetermined scope that to be received from described decay sample circuit; Described clamp circuit comprises first and second diodes (D1-1, D1-2) that are connected in series, first reference power supply (VREF) that is connected with the negative pole of described first and second diodes that are connected in series (D1-1, D1-2), and first pull-up resistor (R4) that is connected with described first reference power supply (VREF), the other end of described first pull-up resistor (R4) is connected with the output terminal of described decay sample circuit.

2. the device that is used for the multiplex fuse wire signal detection as claimed in claim 1 is characterized in that: also comprise the filtering circuit that is connected with described clamp circuit, be used for filtering the noise of the signal that receives from described clamp circuit.

3. the device that is used for the multiplex fuse wire signal detection as claimed in claim 1 is characterized in that: also comprise the resistance (R5) that is connected described clamp circuit output terminal.

4. the device that is used for the multiplex fuse wire signal detection as claimed in claim 2, it is characterized in that: described filtering circuit is output terminal and resistance between the ground (R5) and the electric capacity (C1) that is connected in series in described clamp circuit successively, is used for the high frequency noise of trap signal.

5. one kind is used for the device that multiplex fuse wire signal detects, comprise be used for to input signal decay the sampling the decay sample circuit, it is characterized in that: also comprise the clamp circuit that is connected with described decay sample circuit, be used for the signal limiting also output in predetermined scope that to be received from described decay sample circuit; Also comprise the voltage follower circuit that is connected between described decay sample circuit and the described clamp circuit, be used for stable from described decay sample circuit signal and export described clamp circuit to, described voltage follower circuit be have cathode power supply (+VCC1) and negative power supply (negative feedback emitter follower VCC2), it outputs signal to described clamp circuit by the signal of in-phase input end reception from described decay sample circuit through output terminal; Described clamp circuit comprises first and second diodes (D1-1, D1-2) that are connected in series, the negative pole of described second diode (D1-2) and described cathode power supply (+VCC1) link to each other.

6. the device that is used for the multiplex fuse wire signal detection as claimed in claim 5 is characterized in that:

Described device also comprises filtering circuit, described filtering circuit comprises output terminal and resistance between the ground (R5) and the electric capacity (C1) that is connected in series in described negative feedback emitter follower successively, and described device also comprises second pull-up resistor (R6) and second reference power supply (VREF ') that is connected to its output terminal in turn.

7. one kind is used for the device that multiplex fuse wire signal detects, comprise be used for to input signal decay the sampling the decay sample circuit, it is characterized in that: also comprise the clamp circuit that is connected with described decay sample circuit, be used for the signal limiting also output in predetermined scope that to be received from described decay sample circuit; Also comprise the voltage follower circuit that is connected between described decay sample circuit and the described clamp circuit, be used for stable from described decay sample circuit signal and export described clamp circuit to; Described clamp circuit comprises first and second diodes (D1-1, D1-2) that are connected in series, and second reference power supply (VREF ') that is connected with the negative pole of described second diode (D1-2).