CN101266277A - DC switch protective circuit switching detection device and method - Google Patents
DC switch protective circuit switching detection device and method Download PDFInfo
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- CN101266277A CN101266277A CNA2008100670027A CN200810067002A CN101266277A CN 101266277 A CN101266277 A CN 101266277A CN A2008100670027 A CNA2008100670027 A CN A2008100670027A CN 200810067002 A CN200810067002 A CN 200810067002A CN 101266277 A CN101266277 A CN 101266277A
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Abstract
The invention discloses a device for detecting the on-off state of the direct current switch protective circuit and method thereof, comprising: a signal generator and a signal comparison circuit, wherein the output end of the signal generator is connected with the output end of the direct current switch protective circuit and one output end of the signal comparison circuit. The signal generator is used for generating a preset signal wave and transmitting the preset signal wave into the direct current switch protective circuit and the signal comparison circuit. Another input end of the signal comparison circuit is connected with the output end of the direct current switch protective circuit and outputs the detection signal. The said device can detect the on-off state of the direct current switch protective circuit as true as steel, such as cell fuse, load breaker, nonempty open; and the speed of testing is high and the real time and reliability of the power supply monitoring can be greatly increased.
Description
Technical field
The present invention relates to a kind of break-make detection technique that is used for the DC switch protective circuit of communication power supply, be specifically related to a kind of break-make detection method and device of DC switch protective circuit.
Background technology
Backup battery is the communication network continual important leverage of powering, and is the power supply guarantee of whole communication power supply equipment, is the last line of defense that guarantees the normal operation of communication network.The telecommunication user of China has mostly disposed backup battery, can work incessantly under the situation of city's electrical anomaly in order to guarantee communication facilities.Backup battery needs correctly to safeguard, and management reliably rationally, can guarantee that accumulator has long serviceable life.
Battery applications needs to insert the battery fuse of certain specification in communication power supply the time usually, in order to carrying out overcurrent protection, or disconnects the power supply of accumulator when safeguarding.When the charging of accumulator or discharge current were excessive, fuse was blown, and guarantees that excessive electric current does not damage accumulator, and guarantees the safety of protection system when accidental short circuit.In addition, need off-line to safeguard, when detecting or changing, all need to pull out fuse at accumulator; After safeguarding end, insert fuse again, ensure the security of operation.
Yet when fuse disconnected, accumulator was not insert power-supply system, like this, after exchanging power failure, just can't ensure the uninterrupted power supply of load equipment, and this situation is breakneck.Therefore, in the power supply supervision unit of the power supply system for communications, must detect the on off operating mode of battery fuse, and must the alarm notification user when disconnecting.The user also needs to carry out this test when carrying out the network access testing supervisor in addition.
In the prior art, the way that adopts is usually: detect the voltage at fuse two ends, and detect the electric current of fuse path.The current ratio of fuse path is less if flow through, and the fuse two ends think that just fuse leads to when having smaller voltage difference.But, there is very big drawback in this method, as the threshold value of judgement and the precision height correlation of testing circuit, the threshold value value that the error that testing circuit exists causes judging must be higher, could guarantee can not judge by accident disconnected, otherwise just can't guarantee the degree of accuracy that detects, greatly reduce like this detection accurately and promptness.For example, when the normal floating charge of battery, charging current is almost nil, and disconnect fuse this moment, and detected electric current is no change almost, and simultaneously, the fuse both end voltage is also almost completely equal, does not almost have voltage difference; Wait until the accumulator self discharge, cause voltage to descend, may need a few hours even longer time.During this period of time, power supply supervision unit is to detect the state that disconnects less than fuse; Can there be very big risk like this, can't guarantees the degree of accuracy that detects.
Certainly, except the mode of above-mentioned employing fuse, also there are other control loads and battery-driven mode in the prior art.Such as, in communication power supply, isolating switch is realized once by controlling, second; Ensure power supply and the protection accumulator of important load long period.But isolating switch does not have auxiliary contact yet, correctly judges the break-make of isolating switch, realizes control reliably, is that knotty problem to be solved is arranged yet.In the prior art, the state of determining isolating switch by the variation of judging break-make front and back detection electric current is also arranged, but this mode reliability is low; When situation such as down electricity, load current be less at isolating switch following time, then can't detect the state of isolating switch at all, so power supply supervision unit also can't be realized the effective detection to the telecommunications power supply feed circuit, also can't thoroughly avoid the generation of potential safety hazard.
In addition, in the prior art, some also having occurred has the sky of auxiliary contact to open, but owing to there are quality problems such as mechanical aspects such as the contact are asynchronous, can not guarantee the break-make situation of judging that correctly clearancen is opened fully.Yet, in case false judgment the state of these switches, may cause Power Supply Monitoring to send wrong control, and finally cause the communication power supply catastrophic failure.
From as seen last, thoroughly do not solve the detection that accumulator fuse, load cut-off device, sky such as open at the DC switch protective circuit on off operating mode in the prior art, so technology remains further development.
Summary of the invention
The object of the present invention is to provide a kind of switching detection device and method of DC switch protective circuit; it is used for overcoming the existing communication power-supply system, and battery fuse, load cut-off device, sky such as are opened at the problem that the on off operating mode detecting reliability of DC switch protective circuit is low or can't detect.
To achieve these goals, the present invention adopts following technical scheme:
The invention provides a kind of switching detection device of DC switch protective circuit, described device is used for detecting the on off operating mode that is arranged on the power-supply system DC switch protective circuit, and described pick-up unit comprises: signal generator and signal comparator circuit; The output terminal of described signal generator connects the input end of described DC switch protective circuit and an input end of described signal comparator circuit, described signal generator is used to produce a preset signals ripple, and this signal wave is sent in described DC switch protective circuit and the signal comparator circuit; Another input end of described signal comparator circuit connects the output terminal of described DC switch protective circuit, and described signal comparator circuit is used for the signal wave of more described DC switch protective circuit input end and output terminal, and output detection signal.
In above-mentioned detection device; described pick-up unit also comprises: filtering circuit; the input end of described filtering circuit connects the output terminal of described signal generator, and the output terminal of described filtering circuit connects the input end of described DC switch protective circuit and an input end of described signal comparator circuit.
In above-mentioned detection device, described signal generator is a sine wave signal generator; The sine wave signal of described signal generator output is not for influencing the low frequency small-signal of power-supply system operate as normal; such as; the frequency of the sine wave signal of described signal generator output is less than 100 hertz, the twice of switch pressure drop when the amplitude of this sine wave signal must be greater than described DC switch protective circuit conducting.
In above-mentioned detection device, described pick-up unit is arranged in the panel box of described power-supply system, and, described pick-up unit also comprises a power transfer module, the direct-flow input end of this power transfer module connects the positive negative bus in the described panel box, and the DC voltage that is used for obtaining from positive negative bus is converted to the operating voltage of described pick-up unit.
In above-mentioned detection device, described pick-up unit also comprises: detect controller, the input end of described detection controller connects the power supply supervision unit of power-supply system, the output terminal of described detection controller connects described signal generator, described detection controller is used to receive the enabling signal from described power supply supervision unit, and sends to described signal generator and to be used to control the steering order that described signal generator opens or closes.
In above-mentioned detection device, described signal comparator circuit comprises: differential amplifier circuit and absolute value level comparator,
Two input ends of described differential amplifier circuit connect the output terminal and the input end of described DC switch protective circuit respectively, and described differential amplifier circuit is used for the signal wave of more described DC switch protective circuit input end and output terminal;
An input end of described absolute value level comparator connects a datum, another input end of described absolute value level comparator connects the output terminal of described differential amplifier circuit, and the conversion of signals that described absolute value level comparator is used for described differential amplifier circuit output is high level or low level signal.
In above-mentioned detection device, described signal comparator circuit also comprises: latch,
Described latch connects the output terminal of described absolute value level comparator, is used for the high level or the low level signal of the described absolute value level comparator output of buffer memory.
In above-mentioned detection device, described differential amplifier circuit is the differential amplifier circuit that both-end is imported single-ended output, and the maximum permissible value of described differential amplifier circuit input common mode voltage is greater than direct supply provided in the described current system magnitude of voltage.
The present invention also provides a kind of break-make detection method of DC switch protective circuit, it is characterized in that, said method comprising the steps of:
A, import a preset signals ripple at the input end of DC switch protective circuit;
Whether the output terminal of B, the described DC switch protective circuit of detection exists described preset signals ripple, if not, judges that then described DC switch protective circuit disconnects.
Wherein, in the described steps A, described preset signals ripple is sinusoidal wave, and this sine wave is sent in the described DC switch protective circuit after by filtering; And,
Among the described step B, the signal wave of described DC switch protective circuit input end and output terminal sent in the differential amplifier circuit simultaneously compare,, judge that then described DC switch protective circuit disconnects if when described differential amplifier circuit has signal output.
Adopt described method and apparatus of the present invention, compared with prior art, the detecting definitely reliably of DC switch protective circuit on off operating mode such as realized that battery fuse, load cut-off device, sky in the communication power supply are opened; And it can reach very high detection speed, has improved the real-time and the reliability of Power Supply Monitoring greatly.
Description of drawings
Fig. 1 is the structural representation of pick-up unit of the present invention
Fig. 2 is the structural representation of the another kind of implementation of pick-up unit of the present invention;
Fig. 3 is a kind of embodiment electrical block diagram of pick-up unit of the present invention;
Fig. 4 is the realization flow figure of pick-up unit of the present invention.
Embodiment
Describe technical solution of the present invention in detail below in conjunction with accompanying drawing.
For the detection of DC switch protective circuit on off operating modes such as realizing that battery fuse, load cut-off device, sky are opened, the present invention can adopt following method: import a preset signals ripple at the input end of DC switch protective circuit; Whether the output terminal that detects DC switch protective circuit then has this signal wave; If this signal wave is not just judged that DC switch protective circuit disconnects, otherwise is then represented the DC switch protective circuit conducting.Based on this detection thought; as shown in Figure 1; the invention provides a kind of switching detection device of DC switch protective circuit; described device can be used for detecting the on off operating mode that is arranged on power-supply system DC switch protective circuit 100, and it mainly comprises: signal generator 210 and signal comparator circuit 240.The DC switch protective circuit 100 here can be: battery fuse, load cut-off device, sky are driven or the like on-off circuit.
As shown in Figure 1, above-mentioned signal generator 210 first-selected sine wave signal generators.Why the present invention selects sine wave signal as the extra preset signals ripple that injects, and is because than other signal waves (as square wave), and sinusoidal wave radio-frequency component is less relatively, filtering easily, and sinusoidal wave less relatively to the influence of whole power-supply system.In addition, the sine wave signal of the also first-selected low frequency low amplitude value of the present invention, because when sine wave is the less small-signal of low frequency, amplitude, just can the normal operation and the life-span of the reserve direct supply (as accumulator) in the power-supply system do not impacted, just can not impact to the load ripple.Usually, require the frequency of the sine wave signal of signal generator 210 output will be lower than the normal working frequency of power-supply system, such as less than 100 hertz low frequency small-signal, specifically can be, sine wave freuqency be chosen as 10Hz, and amplitude is 100mV.The amplitude of above-mentioned sine wave signal can obtain littler; frequency also can obtain lower; but; in order to guarantee the reliability of power-supply system and pick-up unit; sinusoidal wave parameter value will be selected suitable value; and can not be too small, the twice of switch pressure drop when the sinusoidal wave amplitude of suggestion must be greater than the DC switch protective circuit conducting.The oscillatory circuit that above-mentioned signal generator 210 can adopt independent component to build is as RC or LC sine wave oscillation circuit or the like; It can also adopt integrated chip, is the chip of ML2035 as model.
As shown in Figure 1, the annexation of each main building block is as follows in the pick-up unit of the present invention: the output terminal of signal generator 210 connects the input end of DC switch protective circuit 100 and an input end of described signal comparator circuit 240, signal generator 210 is used to produce a preset signals ripple, and this signal wave is sent in DC switch protective circuit 100 and the signal comparator circuit 240; Another input end of signal comparator circuit 210 connects the output terminal of DC switch protective circuit 100; signal comparator circuit 240 is used for the signal wave of comparison DC switch protective circuit 100 input ends and output terminal; and output detection signal, in order to judge the on off operating mode of DC switch protective circuit 100.If comparator circuit 240 has been exported sign DC switch protective circuit 100 input ends and the not corresponding to detection signal of output end signal ripple, then judge the disconnection of DC switch protective circuit 100, otherwise, then judge the conducting of DC switch protective circuit 100.The invention solves because of tempolabile signals such as battery tension, electric currents and cause detection speed drawback extremely slowly, thoroughly realize the detection of these DC switch protective circuit on off operating modes, and accuracy height, speed are fast, can also ensure the reliability service of power-supply system back-up source at any time; Be specially adapted to the real-time monitoring of reserve DC power supply switch holding circuit in the power supply system for communications.
As shown in Figure 1; the signal wave that above-mentioned signal generator 210 produces certainly exists certain high-frequency harmonic component; in order to reduce the influence of radio-frequency component to load and power-supply system; pick-up unit of the present invention also comprises: a filtering circuit 230; the input end of filtering circuit 230 connects the output terminal of 210 signal generators, and the output terminal of filtering circuit 230 connects the input end of DC switch protective circuit 100 and an input end of signal comparator circuit 240.If signal generator has filter function, then a filtering circuit can be set separately again.
As shown in Figure 1, switching detection device of the present invention can be arranged in the panel box of power-supply system, and by increasing by a power transfer module 250, direct positive negative bus in panel box is obtained a direct current voltage, and, come to be pick-up unit power supply of the present invention by being the operating voltage of switching detection device with this voltage transitions.Usually the DC voltage of positive negative bus be+48V in the panel box, by obtaining after the step-down processing ± operating voltage of 5V.Do like this and can directly utilize the DC voltage that backup battery is provided in the power-supply system, and do not need to increase again in addition battery.
As shown in Figure 1, about above-mentioned signal comparator circuit 240, the present invention specifically can adopt following method to realize.Signal comparator circuit 240 comprises: differential amplifier circuit 243 and absolute value level comparator 242; Two input ends of differential amplifier circuit 243 connect the output terminal and the input end of DC switch protective circuit 100 respectively, and it is used to receive the signal wave of DC switch protective circuit 100 input ends and output terminal, and the two is compared; An input end of absolute value level comparator 242 connects a datum, another input end of absolute value level comparator 242 connects the output terminal of differential amplifier circuit 243, and its conversion of signals that is used for differential amplifier circuit 243 outputs is high level or low level signal.When utilizing said apparatus to realize that the break-make of DC switch protective circuit detects; can adopt and to be input to the input end of DC switch protective circuit through the sine wave signal after the Filtering Processing; then; detect the output terminal of DC switch protective circuit; the signal wave of DC switch protective circuit input end and output terminal sent in the differential amplifier circuit simultaneously compare; when if described differential amplifier circuit has signal output; judge that then DC switch protective circuit disconnects; if decide like this according to the characteristics of differential amplifier circuit, its principle is as follows.
In above-mentioned testing process; if DC switch protective circuit 100 disconnects; then DC switch protective circuit 100 does not have signal output; differential amplifier circuit 243 is the difference mode signal input so; output terminal at differential amplifier circuit 243 has signal output; by absolute value level comparator 242 can be high level output with this conversion of signals, is convenient to the remote power supply monitoring unit and obtains relevant information.If DC switch protective circuit 100 is conductings; then DC switch protective circuit 100 has signal output; and the signal of its input end and output terminal should be identical; differential amplifier circuit 243 is the common-mode signal input so; because differential amplifier circuit is to the inhibiting effect of common-mode signal; output terminal at differential amplifier circuit 243 does not have signal output, can be low level output with this conversion of signals by absolute value level comparator 242.The differential amplifier circuit here is the differential amplifier circuit that both-end is imported single-ended output, and the differential amplifier circuit of preferred high common mode voltage type is chip of INA117 etc. as model; The maximum permissible value of the input common mode voltage of differential amplifier circuit is greater than the magnitude of voltage that direct supply provided in the current system, for example, when the positive and negative bus bar voltage 48V in the panel box, the common mode voltage that the maximum of differential amplifier circuit allows must surpass the positive and negative bus bar voltage 48V in the panel box.
As shown in Figure 1, do not lose in order to guarantee digital signal, also can increase by a latch 241 in signal comparator circuit 240, latch 241 connects the output terminal of absolute value level comparator 242, is used for the high level or the low level signal of buffer memory absolute value level comparator 242 outputs.
On the basis of structure shown in Figure 1, for the ease of remote control signal generator 210, as shown in Figure 2, pick-up unit of the present invention comprises that also one detects controller 200, its input end connects the power supply supervision unit of power-supply system, and its output terminal connects signal generator 210, is mainly used in the enabling signal that reception is sent from power supply supervision unit, and send steering order at the enabling signal backward signal generator 210 that receives power supply supervision unit, control-signals generator 210 opens or closes.Above-mentioned detection controller 200 can adopt processor commonly used or control chip; as model is ATMEGA32; it mainly acts on is control-signals generator 210; and when power-supply system need be monitored the on off operating mode of DC switch protective circuit 100 at any time; mode by the training in rotation inquiry detects DC switch protective circuit 100, thereby realizes the on off operating mode of remote monitoring DC switch protective circuit 100.When realizing remote monitoring, power supply supervision unit need inject an enabling signal to detecting controller 200, its objective is: the one, be used for opening or closing of control-signals generator 210, just start when needing to detect, can reduce of the influence of the signal wave of extra injection like this power-supply system reserve direct supply (as accumulator); The 2nd, may have a plurality of pick-up units of the present invention in the power-supply system, timesharing starts each pick-up unit, thereby can not cause the phase mutual interference of signal, avoids compound mutually between the signal, and it is compound to detecting the influence that is produced to reduce signal.
As shown in Figure 2, if also increased latch 241 in signal comparator circuit 240, then above-mentioned detection controller 200 can also be used for control lock storage 241.When the power supply supervision unit of power-supply system need detect the break-make of DC switch protective circuit 100, at first to send an enabling signal, when the detection controller 200 in the pick-up unit receives enabling signal then, remove the output of original latch 241, and then enabling signal generator 210, the sine wave output signal, the correctness of assurance data; Receive the testing result of pick-up unit output when power supply supervision unit after, send stop signal, by detecting controller 200 shutdown signal generators 210, whole like this testing process finishes.
Describe a specific embodiment of the present invention in detail below in conjunction with accompanying drawing 3 and Fig. 4.
For the convenience of describing, be example with the battery fuse on the communication power supply, present embodiment is specifically described the specific implementation circuit of single pick-up unit shown in Figure 2.As shown in Figure 3, the pick-up unit of present embodiment comprises: adopt model be 4805 power modules and ICL7660 chip power transfer module 250, adopt model be the ATMEGA32 chip detection controller 200, adopt model be the ML2035 chip sine wave signal generator, adopt model be the MAX280 chip filtering circuit 230, adopt model be the INA117 chip differential amplifier circuit 243, adopt model be the MC33078 chip absolute value level comparator 242, to adopt model be the latch 241 of 74HC74 chip; Annexation between each components and parts can be with reference to above-mentioned structure explanation to Fig. 1, Fig. 2.Above-mentioned each device package constitutes the pick-up unit of present embodiment together, and its external interface has 6 lines, wherein:
+ 48V ,-two power leads of 48V, be linked on the positive negative bus in the power-supply system panel box, present embodiment with-48V as reference of pick-up unit;
An input interface is used to receive the enabling signal START of extraneous power supply supervision unit;
An output interface is used to export testing result signal SIGNAL;
A sine wave signal line is used for sine wave signal S_IN is injected from an end of battery fuse;
A signal input line is used to connect the other end of battery fuse, receives output signal S_OUT.
In the inside of present embodiment pick-up unit, used MCU ATMEGA32, it controls sine wave signal generator ML2035 by the SPI interface, and the control end of MCU connects the LATI end of ML2035.From positive negative bus acquisition+48V power supply,, and then adopt ICL7660 from+5V logic power generation-5V logic power by 4805 module output+5V.As shown in Figure 4, extraneous power supply supervision unit enabling signal START enters the test side of detecting MCU after isolating through optocoupler; MCU judges whether the input of enabling signal START, if software detection to the START signal effectively after, MCU sends signal to the control end CLR of latch 74HC74 immediately, the output in the zero clearing latch, and by SPI interface start signal generator, sine wave output; If software does not detect the START signal, the then output of shutdown signal generator.The sine wave signal of MCU control sine wave signal generator ML2035 output 15Hz, after overdamping and low-pass filtering, sine wave signal S_IN is sent to an end of battery fuse from the sine wave signal line, other end output S_OUT signal from the battery fuse, this S_OUT signal is input to the input end of differential amplifier INA117 together with sine wave signal S_IN, the output of differential amplifier INA117 is carried out absolute value and is relatively exported by an absolute value level comparator MC33078 and reference voltage 0.5V the amplitude design of reference switch maximum pressure drop (value of reference voltage can).After the result of absolute value level comparator MC33078 output enters into latch 74HC74,, be testing result SIGNAL in its D port output.The power supply supervision unit of power-supply system send the START signal effectively after, time-delay a period of time, as 0.1 second, surpass sinusoidal wave at least one-period after, promptly can read testing result; After running through the result, can close the START signal; Like this, MCU software is promptly exported 0Hz by SPI interface control sine wave signal generator ML2035, and draws high the LATI pin level of ML2035, makes ML2035 enter the POWERDOWN pattern, has closed sinusoidal wave output fully.
The pick-up unit of present embodiment is applied in the general power supply system for communications, and this power-supply system has been carried out conventional configuration, and has disposed two group storage batteries (1,2) and second isolating switch (1,2), and each accumulator has been equipped with a battery fuse.So the detection of power supply supervision unit needs to dispose four described pick-up units of present embodiment here for convenience, promptly two battery fuses and two load cut-off devices dispose a described pick-up unit of present embodiment respectively.Like this, in power supply supervision unit, only need to increase by 4 inputting testing terminals and 4 output control terminal mouths, 4 inputting testing terminals insert the testing result SIGNAL of the pick-up unit of 4 present embodiments respectively, and the enabling signal START that 4 inputting testing terminals are respectively applied for the pick-up unit of 4 present embodiments of output gets final product.Power supply supervision unit adopts the mode of poll inquiry, and 4 pick-up units is carried out successively the operation that allows enabling signal, the testing result of delaying time, stops enabling signal and get final product.For example, in the cycle in a second, power supply supervision unit is carried out following operation:
(1) sends the enabling signal that allows battery fuse 1, delayed time 0.1 second, detect the testing result of battery fuse 1; Stop enabling signal; Quiet 0.15 second;
(2) send the enabling signal that allows battery fuse 2, delayed time 0.1 second, detect the testing result of battery fuse 2; Stop enabling signal; Quiet 0.15 second;
(3) send the enabling signal that allows isolating switch 1, delayed time 0.1 second, detect the testing result of isolating switch 1; Stop enabling signal; Quiet 0.15 second;
(4) send the enabling signal that allows isolating switch 2, delayed time 0.1 second, detect the testing result of isolating switch 2; Stop enabling signal; Quiet 0.15 second.
Like this, in the time in a second, can finish the detection of two battery fuses (1,2) and two load cut-off devices (1,2), the time that sine wave signal is present in the power-supply system has only 0.4 second, and 0.6 second quiet time, the influence of power-supply system ripple is very little.The user can freely design as required, balance detection speed and system's ripple influence.Such as, requiring can finish in ten seconds the detection of two battery fuses and two load cut-off devices, the quiet time just reaches full-time 96%, and is just extremely small to the influence of system.
In sum; the present invention is applied in the power supply system for communications; can realize battery fuse, load cut-off device, sky are opened etc. the detection of DC switch protective circuit; add ac small signal by input end at DC switch protective circuit; detect at its output terminal; promptly can very accurately and at high speed detect the on off operating mode of these DC switch protective circuits; solved at present battery fuse, load cut-off device, sky opened etc. and can't detect or detect unreliable, extremely slow etc. detection drawback, ensured that thoroughly power supply moves reliably.
Illustrating of above-mentioned each concrete steps is comparatively concrete, can not therefore think the restriction to scope of patent protection of the present invention, and scope of patent protection of the present invention should be as the criterion with claims.
Claims (10)
1, a kind of switching detection device of DC switch protective circuit, described device is used for detecting the on off operating mode that is arranged on the power-supply system DC switch protective circuit, it is characterized in that, and described pick-up unit comprises: signal generator and signal comparator circuit;
The output terminal of described signal generator connects the input end of described DC switch protective circuit and an input end of described signal comparator circuit, described signal generator is used to produce a preset signals ripple, and this signal wave is sent in described DC switch protective circuit and the signal comparator circuit;
Another input end of described signal comparator circuit connects the output terminal of described DC switch protective circuit, and described signal comparator circuit is used for the signal wave of more described DC switch protective circuit input end and output terminal, and output detection signal.
2, pick-up unit according to claim 1; it is characterized in that; described pick-up unit also comprises: filtering circuit; the input end of described filtering circuit connects the output terminal of described signal generator, and the output terminal of described filtering circuit connects the input end of described DC switch protective circuit and an input end of described signal comparator circuit.
3, pick-up unit according to claim 1 is characterized in that, described signal generator is a sine wave signal generator; The frequency of the sine wave signal of described signal generator output is less than 100 hertz, the twice of the amplitude of this sine wave signal switch pressure drop during greater than described DC switch protective circuit conducting.
4, pick-up unit according to claim 1, it is characterized in that, described pick-up unit is arranged in the panel box of described power-supply system, and, described pick-up unit also comprises a power transfer module, the direct-flow input end of this power transfer module connects the positive negative bus in the described panel box, and the DC voltage that is used for obtaining from positive negative bus is converted to the operating voltage of described pick-up unit.
5, pick-up unit according to claim 1, it is characterized in that, described pick-up unit also comprises: detect controller, the input end of described detection controller connects the power supply supervision unit of power-supply system, the output terminal of described detection controller connects described signal generator, described detection controller is used to receive the enabling signal from described power supply supervision unit, and sends to described signal generator and to be used to control the steering order that described signal generator opens or closes.
6, pick-up unit according to claim 1 is characterized in that, described signal comparator circuit comprises: differential amplifier circuit and absolute value level comparator,
Two input ends of described differential amplifier circuit connect the output terminal and the input end of described DC switch protective circuit respectively, and described differential amplifier circuit is used for the signal wave of more described DC switch protective circuit input end and output terminal;
An input end of described absolute value level comparator connects a datum, another input end of described absolute value level comparator connects the output terminal of described differential amplifier circuit, and the conversion of signals that described absolute value level comparator is used for described differential amplifier circuit output is high level or low level signal.
7, pick-up unit according to claim 6 is characterized in that, described signal comparator circuit also comprises: latch,
Described latch connects the output terminal of described absolute value level comparator, is used for the high level or the low level signal of the described absolute value level comparator output of buffer memory.
8, pick-up unit according to claim 6, it is characterized in that, described differential amplifier circuit is the differential amplifier circuit that both-end is imported single-ended output, and the maximum permissible value of described differential amplifier circuit input common mode voltage is greater than direct supply provided in the described current system magnitude of voltage.
9, a kind of break-make detection method of DC switch protective circuit is characterized in that, said method comprising the steps of:
A, import a preset signals ripple at the input end of DC switch protective circuit;
Whether the output terminal of B, the described DC switch protective circuit of detection exists described preset signals ripple, if not, judges that then described DC switch protective circuit disconnects.
10, detection method according to claim 9 is characterized in that, in the described steps A, described preset signals ripple is sinusoidal wave, and this sine wave is sent in the described DC switch protective circuit after by filtering; And,
Among the described step B, the signal wave of described DC switch protective circuit input end and output terminal sent in the differential amplifier circuit simultaneously compare,, judge that then described DC switch protective circuit disconnects if when described differential amplifier circuit has signal output.
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| CN102520307A (en) * | 2011-12-22 | 2012-06-27 | 广州市旭峰电子产品有限公司 | Power-off automatic identification circuit |
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