CN104201641A - Intrinsically safe circuit for improving capacitive load start capacity - Google Patents
Intrinsically safe circuit for improving capacitive load start capacity Download PDFInfo
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- CN104201641A CN104201641A CN201410401754.8A CN201410401754A CN104201641A CN 104201641 A CN104201641 A CN 104201641A CN 201410401754 A CN201410401754 A CN 201410401754A CN 104201641 A CN104201641 A CN 104201641A
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Abstract
The invention discloses an intrinsically safe circuit for improving the capacitive load start capacity. The intrinsically safe circuit for improving the capacitive load start capacity comprises a switching voltage regulator circuit which is connected with a main power supply access and used for providing voltage regulator direct current output, a compensating pipe control circuit connected with the voltage output circuit, an overcurrent and overvoltage protection circuit which is connected with the compensating pipe control circuit and used for real-time monitoring and regulating of the overvoltage output, short circuit and overcurrent output of the circuit, a counting unit connected with the overcurrent and overvoltage protection circuit, and a monostability trigger circuit which is connected with the counting unit and the compensating pipe control circuit. The counting unit is controlled to count when overcurrent or short circuit occurs during the output of the circuit; when the counting unit counts to a threshold, the monostability trigger circuit enters a temporary steady state output state and controls the compensating pipe control circuit connected with the monostability trigger circuit to cut off the output; when the short circuit or the overcurrent is recovered, a counting signal of the counting unit is invalid; the compensating pipe control circuit outputs normally.
Description
Technical field
A kind of intrinsically safe circuit that can provide capacitive load to start ability is provided.Relate to Patent classificating number H02 generating, power transformation or distribution H02H emergency protection circuit device for electric H02H3/00 to the direct automatic disconnection emergency protection circuit device for electric of response of the undesirable variation of normal electricity work, have or impunity after connect again H02H3/26 to voltage difference or difference between current response; The H02H3/32 of the phase difference response between voltage or between electric current is comprised the magnitude of voltage in respective point on the different conductor of triangular web or current value compared, for example the electric current in go and return conductor relatively.
Background technology
The intrinsically safe circuit part linear voltage stabilization way of outputs that adopt of traditional mine intrinsic safety electric source more, Main Means by constant current output as inhibition sparkover, work as transcient short circuit time, electric current increases rapidly, finally be limited to constant current maximum, when load current continues to increase, owing to adjusting, pipe two ends pressure reduction is larger, the power consumption of adjusting pipe can significantly increase, thermal stability is bad, causing adjusting pipe heating burns out, and adopt switch-type stabilized to export essential safe type circuit, because capacitive and the perception of circuit output end are larger, can only suppress sparkover by turn-offing fast to adjust to manage, during short circuit, the energy of abrupt release is larger, detecting electric current turn-offs fast over threshold value, yet giving the load supplying moment with capacitive, often can reach rapidly over-current protection point, cause overcurrent protection action, load capacity is not strong.
At present, the essential safe type circuit efficiency based on linear voltage stabilization output is low, during heavy load power supply; due to input and output pressure reduction larger, adjust pipe power consumption higher, caloric value is high; even if increase the larger fin of volume, thermal stability is still bad, and the essential safe type circuit efficiency of exporting based on switch voltage-stabilizing is high; do not generate heat; volume is little, but in load capacity extreme difference, especially capacitive load start-up course; instantaneous large-current impact can cause overcurrent protection, causes load to start.
Summary of the invention
The present invention is directed in the intrinsically safe circuit capacitive load start-up course of prior art; the moment that loads on startup can produce heavy current impact; cause overcurrent protection; and the problem that constantly overcurrent protection mechanism can cause load to start; a kind of intrinsically safe circuit that improves capacitive load startup ability of development, has:
The switch voltage-stabilizing circuit that is connected, provides voltage stabilizing direct current to export with main supply access; The adjustment pipe control circuit being connected with this voltage-stabilizing output circuit, adjusts pipe and is output as final circuit output in this circuit; With the overcurrent-overvoltage protecting circuit that adjustment pipe control circuit is connected, the overvoltage output of this protective circuit Real-Time Monitoring circuit and short circuit and overcurrent are exported and make adjustment; The counting unit being connected with described overcurrent-overvoltage protecting circuit; With the single-shot trigger circuit that described timing unit is connected, these circuits for triggering are connected with described adjustment pipe control circuit; When described overcurrent-overvoltage protecting circuit detects circuit output generation overcurrent or short circuit, control described counting unit and start counting; When counting unit reaches threshold value, described single-shot trigger circuit is carried out temporary stable state output state, controls connected adjustment pipe control circuit and turn-offs output; When described overcurrent-overvoltage protecting circuit detects short circuit or overcurrent recovery, the count signal of invalid counting unit; Described single-shot trigger circuit becomes lower state, and described adjustment pipe output circuit output is normal.For capacitive load, start and two kinds of reasons that cause overcurrent of short circuit, set time threshold, when overtime threshold value, can assert open circuit generation, at once breaking circuit; When there is no overtime threshold value, circuit does not turn-off, and prevents that capacitive load from starting the overcurrent repeated trigger overcurrent protection mechanism causing, causes power supply can not normally start all the time.
As an execution mode preferably, described overcurrent-overvoltage protecting circuit comprises a comparator being connected with described adjustment pipe control circuit, level and baseline signal level that this comparator gathers the over-current signal of described adjustment pipe control circuit generation compare, when over-current signal being detected, to described counting unit, export a zero clearing count signal, trigger described counting unit and start counting; When over-current signal disappearance being detected, to described counting unit, send and stop count signal.
Further, as intrinsically safe circuit, considering that overcurrent and short circuit are simultaneously, also need reply to adjust the situation that overvoltage may appear in pipe control circuit, therefore preferred, level and baseline signal level that described overcurrent-overvoltage protecting circuit gathers described adjustment pipe control circuit overvoltage signal compare; While detecting overvoltage signal, control described adjustment pipe control circuit and turn-off output.
As an execution mode preferably, the core components and parts of described adjustment pipe control circuit comprise a PMOS pipe I who is connected with described overcurrent-overvoltage protecting circuit, and when circuit is normally exported, this PMOS pipe I is conducting state; When circuit overvoltage or overcurrent (short circuit); controlled by the output state of described overcurrent-overvoltage protecting circuit (overvoltage condition) or single-shot trigger circuit (overcurrent or short-circuit condition); grid voltage and the source voltage of PMOS pipe I equate; metal-oxide-semiconductor is closed output, i.e. the output of breaking circuit.Select PMOS as the adjustment pipe control circuit of core components and parts, the load switch conventionally adopting compared to prior art can have wider voltage range of choice, especially during high voltage, does not have suitable load switch corresponding; Relative and relay switch has the advantage of fast response time.
As an execution mode preferably, described counting unit comprises that one continues to send the pulse generating circuit and a pulse-scaling circuit being connected with this circuit for generating, the input signal that described continuous impulse ripple is this counting circuit of impulse wave at output; Zero clearing by described overcurrent-overvoltage protecting circuit output is counted input signal as the control signal of counting circuit zero clearing counting end; If control signal is effective, described pulse-scaling circuit starts counting; If control signal is invalid, described pulse-scaling circuit stops counting.Adopt these two kinds of modes can effectively solve the problem of the reliability that powers on for the first time.
Further, consider some environment for use of circuit, such as colliery etc. requires safety circuit not produce in the course of the work spark conventionally, therefore be provided with a spark suppression circuit between described switch voltage-stabilizing circuit and adjustment pipe control circuit, as an execution mode preferably, this circuit comprises a PMOS pipe II, and the source electrode of this PMOS pipe II is connected with the resistance of a Limited Current, is parallel with 2 triodes at the two ends of this resistance;
When capacitive load moment starts or is short-circuited, the voltage at resistance R 2 two ends can be greater than rapidly the threshold voltage of two described triodes, two triode transient switchings, make PMOS pipe IQ2 cut-off, circuit is turned off, and now output current declines rapidly, when resistance both end voltage returns to lower than triode conduction threshold, PMOS pipe IQ2 continues conducting, repeats said process, until circuit overcurrent condition is eliminated.
As an execution mode preferably, described overcurrent-overvoltage protecting circuit is dual overcurrent-overvoltage protecting circuit.
Owing to having adopted above-mentioned counting scheme; a kind of intrinsically safe circuit that capacitive load starts ability that improves provided by the invention; by dual overcurrent-overvoltage protecting circuit is set; counting unit and single-shot trigger circuit; significantly improved the startup ability of capacitive load; superior performance when particularly the large capacitive load of remote power-feeding is started; and possesses high reliability; adopt overcurrent turn-off function mode that product thermal stability is further strengthened; efficiency improves; the volume that has greatly dwindled circuit, has reduced cost simultaneously.
Accompanying drawing explanation
Counting scheme for clearer explanation embodiments of the invention or existing counting, by being done to one, the accompanying drawing of required use in embodiment or the description of existing counting introduces simply below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for the common counting personnel in this area, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is system module figure of the present invention
Fig. 2 is switch voltage-stabilizing circuit figure of the present invention
Fig. 3 is spark suppression circuit figure of the present invention
Fig. 4 is that the present invention adjusts management and control circuit diagram processed
Fig. 5 is single-shot trigger circuit circuit diagram of the present invention
Fig. 6 is pulse generating circuit circuit diagram of the present invention
Fig. 7 is the circuit diagram of pulse-scaling circuit
Fig. 8 is dual overcurrent-overvoltage protecting circuit circuit diagram
Embodiment
For making object, counting scheme and the advantage of embodiments of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, the counting scheme in the embodiment of the present invention is known to complete description:
Embodiment 1; a kind of intrinsically safe circuit that provides capacitive load to start ability as described in Figure 1, mainly comprises: dual overcurrent-overvoltage protecting circuit, pulse-scaling circuit, pulse generating circuit and the single-shot trigger circuit of switch voltage-stabilizing circuit, spark suppression circuit, the adjustment pipe control circuit as the final output of circuit, Real-Time Monitoring adjustment pipe control circuit overcurrent or overvoltage output.
When described overcurrent-overvoltage protecting circuit detects circuit output generation overcurrent or short circuit, control described counting unit and start counting; When counting unit reaches threshold value, described single-shot trigger circuit is carried out temporary stable state output state, controls connected adjustment pipe control circuit and turn-offs output.
When described overcurrent-overvoltage protecting circuit detects short circuit or overcurrent, the over-current detection part control impuls counting circuit of dual overcurrent-overvoltage protecting circuit is effective, make pulse-scaling circuit immediately the pulse signal of paired pulses circuit for generating count, reach after predetermined value, trigger single-shot trigger circuit and enter temporary stable state output state, control and adjust pipe control circuit shutoff output, and when short circuit or overcurrent recovery being detected, the over-current detection part control impuls counting circuit of dual overcurrent-overvoltage protecting circuit is invalid, the pulse signal that makes pulse-scaling circuit stop paired pulses circuit for generating is counted, like this, single-shot trigger circuit is still in lower state, can be from recovering while making to be short-circuited Failure elimination, moment is while starting large capacitive load or remote power-feeding, can not reach because of the High-current output of moment over-current detection point, be unlikely to misoperation and turn-off output, effectively improve the large capacitive load ability that starts, and there is high reliability.When described overcurrent-overvoltage protecting circuit monitors circuit output generation overvoltage, directly control described adjustment pipe control circuit and turn-off output.
Described switch voltage-stabilizing circuit is as shown in Figure 2: comprise chip U2, the 4th pin output (V0) of this chip is as the input of spark suppression circuit.This circuit is used for providing voltage stabilizing output, can be preferred, and voltage reduction module LM2596 voltage reduction module, the voltage of can reduced output voltage setting, in the present embodiment, sets this voltage reduction module and the voltage of 26-37V is down to the 24V output of setting.
Or select buck module MC34063 that larger input voltage range is provided, in the present embodiment the voltage of 5-40V is become to the 24V output of setting.
Also can select special-purpose power module of voltage regulation ZB15, input range is 18-36V, the 24V voltage that output is set.
The core of described spark suppression circuit is a PMOS pipe Q2, and the source electrode of this PMOS pipe Q2 is connected with described switch voltage-stabilizing circuit by a resistance R 2, the grounded-grid of PMOS pipe Q2, and drain electrode is as the output of spark suppression circuit, as shown in Figure 3 VP.Resistance R 2 under being connected between the base stage of triode Q5 and emitter, the collector electrode of described triode Q5 is by resistance R 11 ground connection, and triode Q6 is in parallel with described triode Q5.
PMOS pipe Q2 is powering on or normal condition during in conducting state first, R2 is for Limited Current, when capacitive load moment starts or is short-circuited, the voltage at resistance R 2 two ends can be greater than rapidly the threshold voltage of triode Q5 and triode Q6, and triode Q5 and triode Q6 transient switching make PMOS pipe IQ2 cut-off, circuit is turned off, now output current declines rapidly, and when resistance R 2 both end voltage return to lower than triode Q5 and triode Q6 conduction threshold, PMOS pipe IQ2 continues conducting.So repeatedly, until overcurrent condition elimination.R3 and R11 are as the dividing potential drop of Q2 grid and source electrode, and while normally working, due to the dividing potential drop effect of R3 and R11, V0 is greater than the grid voltage of Q2, Q2 normally; When overcurrent, the grid voltage of the voltage of V0 and PMOS pipe Q2 equates.
In the present embodiment, triode Q5 and triode Q6 select S9012, and the voltage of its conducting is 0.7V.PMOS pipe Q2 selects IRF9630, and the resistance of R3 and R11 is 100k, and R2 is 1.4 Ω.R2's is 500mA by current threshold, and when surpassing 500mA by electric current, the pressure drop that R2 produces makes triode Q5 and Q6 conducting, and now, in circuit, the voltage of 2 of AB equates, thereby Q2 is turn-offed.Under normal condition, circuit input 24V output is also close to 24V.According to the characteristic of PMOS pipe, when VG=VS, PMOS manages shutoff, when VG < VS-Vth, and PMOS conducting.
As shown in Figure 4: described adjustment management and control main circuit processed will comprise: the PMOS pipe Q3 of two series connection that arrange in order to strengthen system reliability and PMOS pipe Q4, be connected with dual overcurrent-overvoltage protecting circuit with spark suppression circuit respectively.The PMOS pipe source electrode of Q3 and the output of described spark suppression circuit, VP connects as shown in the figure, the drain electrode of PMOS pipe Q4, VOUT is as the output of circuit as shown in the figure.
Difference adjusting resistance R7 in parallel and R8 between the source electrode of PMOS pipe Q3 and PMOS pipe Q4 and grid.
The grid of PMOS pipe Q3 and Q4 is connected with single-shot trigger circuit with described dual overcurrent-overvoltage protecting circuit respectively.Wherein, PMOS pipe Q3 is connected with single-shot trigger circuit by a diode D4, accepts to turn-off and recovery conducting from the mistake flow control signals of single-shot trigger circuit.Also by a diode D6, be connected with described dual overcurrent-overvoltage protecting circuit, accept the control signal from dual overcurrent-overvoltage protecting circuit.Wherein, diode D4 and diode D6 guarantee the one-way flow of control signal.
Same, PMOS pipe Q4 is connected with single-shot trigger circuit by a diode D5, accepts to turn-off and recovery conducting from the mistake flow control signals of single-shot trigger circuit; By a diode D6, be connected with described dual overcurrent-overvoltage protecting circuit, accept the control signal from dual overcurrent-overvoltage protecting circuit.
In the present embodiment, this input voltage VP and output voltage VO UT that adjusts pipe control circuit is 24V under normal circumstances.Wherein OC_CTLA and OC_CTLB cross flow control signals and OV_CTLA and OV_CTLB overvoltage control signal and are 24V.
In circuit, PMOS pipe Q3 and Q4 all select AOD425, and adjusting resistance R7 and R8 are that 100k resistance R 12, R13, R17 and R18 are 51k.
When OC_CTLA and/or OC_CTLB input the signal of corresponding 24V, described Q3 and/or Q4 turn-off.
Same, when OV_CTLA and OV_CTLB input the signal of corresponding 24V, described Q3 and/or Q4 turn-off.
The input of described dual overcurrent-overvoltage protecting circuit is connected (vout) with the output of described adjustment pipe control circuit; for acquisition and processing overvoltage, overcurrent or short circuit; mainly comprise: in order to increase the reliability of system, be provided with two comparators; comparator U14 and comparator U141; comparator is divided into the part of processing overcurrent and the part of processing overvoltage; here the comparator U14 of take describes as example, as shown in Figure 8: the model that comparator adopts can be preferably LM293A.
No. 8 pins (VCC) of comparator U14 connect the collector electrode of a triode Q13, No. 1 pin (Vout1) connects the base stage of described triode Q13, and the emitter output of triode Q13 is as processing the zero clearing count signal of the control signal (out0 as shown in the figure) of overcurrent as pulse-scaling circuit.
No. 7 pins (vout2) of the latter half of described comparator U14 are connected with the base stage of triode Q19 by resistance R 51, No. 4 pin is connected with the emitter of triode Q19, triode Q19 is connected with triode Q9 by a resistance R 47, overvoltage control signal by No. 7 pin outputs, collector electrode by triode Q9 exports adjustment pipe control circuit to, completes its switching.
The form of comparator 141 is consistent with the form of comparator U14, by the emitter output zero clearing count signal (out0) of triode Q131; The signal of adjusting the switching of pipe control circuit is controlled in collector electrode output by triode Q91.
Pulse-scaling circuit comprises with chip U11, and the counting reset signal (out0) that No. 1 pin of chip is accepted dual overcurrent-overvoltage protecting circuit transmission starts zero clearing counting; No. 2 pins are accepted the QCLK signal of being exported by pulse generating circuit, i.e. pulse signal, and the signal of described single-shot trigger circuit work is controlled in No. 12 pins outputs.
As shown in Figure 5: described single-shot trigger circuit comprises two chip U9 and chip U19, take chip U9 as example, pulse-scaling circuit output signal, out1 as shown in Figure 5, the signal of output is exported by No. 13 pins, input the base stage of a triode Q17, by the collector electrode of triode Q17, exported to the base stage of triode Q7, finally the collector electrode by triode Q7 exports described adjustment pipe control circuit to, as adjusting the control signal that in pipe control circuit, PMOS pipe is opened and turn-offed, signal is 24V in the present embodiment.Preferably, the model of described Q7 and Q8 is S8550, and the model of Q17 and Q18 is S8050.
Equipment described in the present embodiment, through overtesting, can normally start that to be serially connected in total length be 3km, and at least 3 capacitive loads on 1.5 squares of circuits, have splendid application prospect.
The above; it is only preferably embodiment of the present invention; but protection scope of the present invention is not limited to this; in the count range that any counting personnel that are familiar with this counting field disclose in the present invention; according to counting scheme of the present invention and inventive concept thereof, be equal to replacement or changed, within all should being encompassed in protection scope of the present invention.
Claims (8)
1. improve the intrinsically safe circuit that capacitive load starts ability, have:
The switch voltage-stabilizing circuit that is connected, provides voltage stabilizing direct current to export with main supply access;
The adjustment pipe control circuit being connected with this voltage-stabilizing output circuit, adjusts pipe and is output as final circuit output in this circuit;
With the overcurrent-overvoltage protecting circuit that adjustment pipe control circuit is connected, the overvoltage output of this protective circuit Real-Time Monitoring circuit and short circuit and overcurrent are exported and make adjustment;
The counting unit being connected with described overcurrent-overvoltage protecting circuit;
With the single-shot trigger circuit that described timing unit is connected, these circuits for triggering are connected with described adjustment pipe control circuit;
When described overcurrent-overvoltage protecting circuit detects circuit output generation overcurrent or short circuit, control described counting unit and start counting; When counting unit reaches threshold value, described single-shot trigger circuit is carried out temporary stable state output state, controls connected adjustment pipe control circuit and turn-offs output;
When described overcurrent-overvoltage protecting circuit detects short circuit or overcurrent recovery, the count signal of invalid counting unit; Described single-shot trigger circuit becomes lower state, and described adjustment pipe output circuit output is normal.
2. a kind of intrinsically safe circuit that capacitive load starts ability that improves according to claim 1, be further characterized in that described overcurrent-overvoltage protecting circuit comprises a comparator being connected with described adjustment pipe control circuit, level and baseline signal level that this comparator gathers the over-current signal of described adjustment pipe control circuit generation compare, when over-current signal being detected, to described counting unit, export a zero clearing count signal, trigger described counting unit and start counting; When over-current signal disappearance being detected, to described counting unit, send and stop count signal.
3. a kind of intrinsically safe circuit that capacitive load starts ability that improves according to claim 1 and 2, is further characterized in that level and baseline signal level that described overcurrent-overvoltage protecting circuit gathers described adjustment pipe control circuit overvoltage signal compare; While detecting overvoltage signal, control described adjustment pipe control circuit and turn-off output.
4. a kind of intrinsically safe circuit that capacitive load starts ability that improves according to claim 3, is further characterized in that:
Described adjustment pipe control circuit comprises a PMOS pipe I who is connected with described overcurrent-overvoltage protecting circuit, and when circuit is normally exported, this PMOS pipe I is conducting state; When circuit overvoltage or overcurrent, controlled by the output state of described overcurrent-overvoltage protecting circuit or single-shot trigger circuit, grid voltage and the source voltage of PMOS pipe I are equal, and PMOS pipe I closes output, i.e. the output of breaking circuit.
5. a kind of intrinsically safe circuit that capacitive load starts ability that improves according to claim 2, be further characterized in that described counting unit comprises that one continues to send the pulse generating circuit and a pulse-scaling circuit being connected with this circuit for generating, the input signal that pulse is this counting circuit of impulse wave at output; Zero clearing by described overcurrent-overvoltage protecting circuit output is counted input signal as the control signal of counting circuit zero clearing counting end; If control signal is effective, described pulse-scaling circuit starts counting; If control signal is invalid, described pulse-scaling circuit stops counting.
6. a kind of intrinsically safe circuit that capacitive load starts ability that improves according to claim 1, be further characterized in that described switch voltage-stabilizing circuit and adjust between pipe control circuit and be provided with a spark suppression circuit, this circuit comprises a PMOS pipe II, the source electrode of this PMOS pipe II is connected with the resistance I of a Limited Current, is parallel with 2 triodes at the two ends of this resistance;
When capacitive load moment starts or is short-circuited, the voltage at resistance I two ends can be greater than rapidly the threshold voltage of two described triodes, two triode conductings, make PMOS pipe II cut-off, circuit is turned off, and now output current declines rapidly, when resistance both end voltage returns to lower than triode conduction threshold, PMOS pipe II continues conducting, repeats said process, suppresses the generation of electric spark.
7. according to a kind of intrinsically safe circuit that improves capacitive load startup ability described in claim 1,2,5 or 6, be further characterized in that: described overcurrent-overvoltage protecting circuit is dual overcurrent-overvoltage protecting circuit.
8. a kind of intrinsically safe circuit that capacitive load starts ability that improves according to claim 1, described switch voltage-stabilizing circuit, is DC/DC switch voltage-stabilizing circuit, step-up/down switch voltage-stabilizing module or buck switch voltage-stabilizing module.
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Cited By (13)
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| CN106406488A (en) * | 2015-03-03 | 2017-02-15 | 桑迪士克科技有限责任公司 | System and method for dynamic monitoring of controller current consumption |
| CN106451732A (en) * | 2016-11-30 | 2017-02-22 | 合肥源擎电气科技有限公司 | Dual protection system for high-power off-grid photovoltaic controller and method of dual protection system |
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