CN204615366U - A kind of double-current defencive function power supply - Google Patents
A kind of double-current defencive function power supply Download PDFInfo
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- CN204615366U CN204615366U CN201520321088.7U CN201520321088U CN204615366U CN 204615366 U CN204615366 U CN 204615366U CN 201520321088 U CN201520321088 U CN 201520321088U CN 204615366 U CN204615366 U CN 204615366U
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Abstract
The utility model discloses a kind of double-current defencive function power supply, comprise input starting current testing circuit (1), rated operational current testing circuit (2), current logic decision circuitry (3), switch tube driving circuit (4).It is characterized in that: input starting current testing circuit (1) and rated operational current testing circuit (2) parallel operation, utilize input starting current testing circuit (1) fast response time, the detection current peak arranged is high, rated operational current testing circuit (2) response speed is slow, the low feature of detection current value arranged, the overcurrent phenomenon effectively distinguished in the startup of power supply, occur in the situation such as normal work or load overload short circuit.The Logic judgment signal that current sampling signal converts to exports to current logic decision circuitry (3), current logic decision circuitry (3) comprehensive descision provides corresponding signal and exports to switch tube driving circuit (4) or latch completely, switch tube driving circuit (4) controls opening and shutoff of power supply major loop switching tube, current logic decision circuitry (3) if provide complete latch signal, then completely powered-down work.This double-current defencive function power supply can protect the overcurrent phenomenon in the switching tube work occurred in multiple situation in time, effectively and don't mussily.
Description
Technical field
The utility model relates to a kind of power supply, particularly relates to a kind of electric motor starting power supply possessing dual current protecting function.
Background technology
Along with the development of power technology, adopt the power supply of PWM demodulator driven MOS pipe or IGBT work more and more general, thisly utilize metal-oxide-semiconductor or IGBT as the power supply of switching tube relative to traditional power frequency supply, possesses power density high, the advantage that volume is little, but relative to traditional power frequency supply, its metal-oxide-semiconductor or IGBT impact resistance more weak, particularly when load is DC motor, motor start starting current is generally three to five times of its rated operational current, and in actual applications, motor occurs that stall or load damage and cause the situation of power supply output short-circuit also to happen occasionally, in these situations, the operating current of switching tube is very large, metal-oxide-semiconductor or IGBT is very easily caused to damage and make whole power supply permanent damage.
In use procedure, there is following drawback in the common power supply in market:
(1) speed that power supply is protected in the course of the work causes power supply permanent damage not soon.The operating frequency of the semi-conducting materials such as metal-oxide-semiconductor, IGBT pipe, power diode is all higher, and a lot of protection response just causes these semiconductor device permanent damage not in time;
(2) can not clearly distinguish starting current, rated operational current, short circuit current, very easily cause protection disorderly, make load cisco unity malfunction, protect or cause the damage of power supply by mistake.
Summary of the invention
For above-mentioned the deficiencies in the prior art, the utility model proposes a kind of high speed protective circuit that clearly can differentiate starting current, rated operational current, load short circuit current, effectively prevent metal-oxide-semiconductor or IGBT to be hit and damage and cause the damage of power supply.
the utility model is achieved through the following technical solutions above-mentioned purpose:
Double-current defencive function power supply described in the utility model comprises input starting current testing circuit, rated operational current testing circuit, current logic decision circuitry, switch tube driving circuit.It is characterized in that: input starting current testing circuit and rated operational current testing circuit parallel operation, current sampling signal is converted to Logic judgment signal and export to current logic decision circuitry, current logic decision circuitry comprehensive descision provides corresponding signal and exports to switch tube driving circuit or latch completely, switch tube driving circuit controls opening and shutoff of power supply major loop switching tube, if current logic decision circuitry provides complete latch signal, then powered-down work completely.
In above-mentioned input starting current testing circuit, the voltage pulse signal that switching tube operating current is converted into enters comparator in-phase input end through resistance.Reference voltage through resistance, the generation of potentiometer dividing potential drop enters the reverse input end of comparator again through resistance, when the signal of comparator in-phase input end is greater than the fiducial value of reverse input end setting, the output of comparator produces high level, provides Logic judgment signal.The resistance changing potentiometer can change the reference voltage of comparator reverse input end, is in fact exactly set different starting current protection values.
In above-mentioned rated operational current testing circuit, the voltage pulse signal that switching tube operating current converts to enters comparator in-phase input end through filter capacitor, resistance.Reference voltage through resistance, the generation of potentiometer dividing potential drop enters the reverse input end of comparator again through resistance.When the signal of comparator in-phase input end is greater than reverse input end, the output of comparator produces high level, provides Logic judgment signal.The resistance changing potentiometer can change the reference voltage of comparator reverse input end, is in fact exactly set different specified protective current values.In input starting current testing circuit, in the output signal of comparator and rated operational current testing circuit, the output signal of comparator forms and computing through diodes in parallel, output current Logic judgment signal.
In above-mentioned current logic decision circuitry, current logic judges in the pulse-width modulation circuit that signal input is made up of monostable flipflop CD4098, resistance, electric capacity, current logic judges that signal is after different pulse-width modulations, exports instantaneous cut-off signals and latches memory signal.Instantaneous cut-off signals and latch memory signal input to coincidence counter CC40161 simultaneously, by CC40161 be recorded in latch memory signal occur during this period of time in, there is the pulse number of instantaneous power cutoff drive singal, i.e. the number of times of power supply instantaneous protection.CC40161 the 14th, 13,12,11 pin respectively corresponding latch that memory signal occurs during this period of time in have recorded 1,2,4,8 instantaneous protection; the output signal of one of them port is selected to can be used as permanent shut-down signal, the drive singal of thorough on-off switching tube or the input of power supply.
In above-mentioned switch tube driving circuit, TL494 is a kind of pulsewidth modulated intergrated circuit chip of fixed frequency, and operating frequency is regulated by non-essential resistance and electric capacity.Instantaneous cut-off signals directly sends into the dead band comparator of TL494 the 4th pin on the one hand by diode, directly the output of shutoff TL494, the drive singal of switching tube just without, achieve and turn off instantaneously, protection switch pipe is injury-free.Instantaneous cut-off signals is on the other hand by diode, and resistance, to capacitor charging, then sends into the dead band comparator of TL494 the 4th pin.Electric capacity has energy storage effect; after instantaneous cut-off signals is eliminated; electricity release on the electric capacity be full of needs through after a period of time could discharge off; the voltage that the present invention utilizes the slow electric discharge of electric capacity to realize TL494 the 4th pin slowly drops to low level by high level, realizes the soft start after power supply quilt moment turn-off protection.
Compared with prior art, the beneficial effects of the utility model are:
(1) by the operating current on rated operational current testing circuit sense switch pipe, the detection current value of rated operational current testing circuit setting is less, but response speed is slow, the problem that impulse current of starting shooting when effectively can avoid Power supply belt inductive load is like this large, the electric current exceeding source nominal work for a long time can be detected again, prevent power supply long-term work under the state of excess load, causing power supply generate heat and damage;
(2) by input starting current testing circuit, be provided with larger current protection value, but the detection mode that protection response speed is very fast again, namely allow switching tube can bear larger starup current in a short period of time to impact, again can impulse current too large and exceeded the maximum current that switching tube can bear time, fast and effeciently protection switch pipe does not damage by the impact of this big current;
(3) by current logic decision circuitry, impulse current when inductive load is started, the electric current exceeding rated operation occurred after inductive load is started, current logic decision circuitry can provide instantaneous protection signal switch tube and protect fast, after these two kinds of over-current phenomenon avoidance are eliminated, power supply recovers again the shape that normally works; But for frequent or when continuing to occur switching tube overcurrent phenomenon; illustrate that load or power supply there occurs expendable fault; current logic decision circuitry the latch memory signal that provides occur during this period of time in; according to the number of times being recorded to power supply transient protection; provide the input of signal cut power supply or permanent on-off switching tube drive singal; state power supply being in turn off completely, prevents power supply from suffering expendable damage.By these two kinds of protected modes, the impact that can cause starting current, the overload of short time or short circuit are protected with carrying out effective restorability, can carry out again the protection of effective irrecoverability to the situation of overload or short circuit for a long time;
(4) switch tube driving circuit is passed through; realize start soft start; instantaneous protection; the mode that soft start after instantaneous protection combines; switching tube is opened under any state be all the state being in soft start open-minded; prevent the impact of switch tube in a effective manner, effectively prevent the impact to load.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Accompanying drawing 1 is circuit frame figure of the present utility model.
Accompanying drawing 2 is input starting current testing circuit of the present utility model and rated operational current testing circuit schematic diagram.
Accompanying drawing 3 is current logic decision circuitry schematic diagrams of the present utility model.
Accompanying drawing 4 is switch tube driving circuit schematic diagrams of the present utility model.
Embodiment
As shown in Figure 1, double-current defencive function power supply described in the utility model by inputting starting current testing circuit 1, rated operational current testing circuit 2, current logic decision circuitry 3, switch tube driving circuit 4 form.Input starting current testing circuit 1 and rated operational current testing circuit 2 parallel operation, current sampling signal is converted to Logic judgment signal and export to current logic decision circuitry 3, current logic decision circuitry 3 comprehensive descision provides corresponding signal and exports to switch tube driving circuit 4 or latch completely, switch tube driving circuit 4 controls opening and shutoff of power supply major loop switching tube, if current logic decision circuitry 3 provides complete latch signal, then powered-down work completely.
As shown in Figure 2, current detection signal is through the in-phase input end of resistance R1 input comparator IC1A, accessory power supply voltage is after resistance R3, potentiometer RP1 and electric capacity C1 divider filter, through the inverting input of resistance R2 input comparator IC1A, when the detection signal of IC1A in-phase input end is greater than the reference signal of inverting input, comparator IC1A output is high level, and accessory power supply judges signal through resistance R4, R5 and diode D1 output logic, current detection signal is through resistance R6, the resistive-capacitive voltage divider delay circuit that R7 and electric capacity C2 forms, again through the in-phase input end of resistance R9 input comparator IC1B, accessory power supply voltage is through resistance R8, after potentiometer RP2 and electric capacity C3 divider filter, through the inverting input of resistance R10 input comparator IC1B, when the detection signal of IC1B in-phase input end is greater than the reference signal of inverting input, comparator IC1B output is high level, accessory power supply is through resistance R11, R12 and diode D2 output logic judge signal, the input end signal in the same way of IC1B increases resistive-capacitive voltage divider delay circuit and designs to avoid start impulse current.By the resistance of regulator potentiometer RP1, RP2, different reference signals can be set, comparator IC1A is for detecting start impulse current value, comparator IC1B for detect inductive load start after operating current, so the baseline signal value of IC1A is much larger than the baseline signal value of IC1B.
As shown in Figure 3, current logic judges that signal inputs monostable flipflop IC2A and IC3A respectively.After 4th pin of IC2A receives high voltage, the 6th pin just produces the pulse signal of certain hour, the discharge and recharge Time dependent that the burst length is made up of resistance R13 and electric capacity C4.Complete when the discharge and recharge time one, there are 180 degree of upsets in the pulse signal of the 6th pin, monostable flipflop IC2B starts timing, and the 10th pin starts to export high level, the discharge and recharge Time dependent that the time that high level continues is made up of resistance R14 and electric capacity C5.The discharge and recharge time that resistance R13 and electric capacity C4 forms is very short, and therefore the 4th pin of IC2A is once receive high level signal, and IC2B the 10th pin exports high level soon, is therefore called instantaneous protection signal.IC3A, IC3B, resistance R15 with R16, electric capacity C6 with C7 are consistent with the above-mentioned course of work, and it is larger that the time constant of just discharge and recharge is arranged.4th pin of IC3A is once receive high level signal, and IC2B the 9th pin output low level soon, is just turned into high level after the abundant circuit charging-discharging cycle of resistance R15 and R16, electric capacity C6 and C7 composition terminates.Low level signal during this period of time claims latch memory signal.IC4 is 4 binary synchronous counters, occurs the number of times of high level, namely record the number of times that overcurrent appears in switching tube in order to be recorded in the interior during this period of time IC2B latching memory signal generation.IC4 the 14th, 13,12,11 pin are the output port of corresponding record to the phenomenon of 1,2,4,8 overcurrent respectively; a port output signal can be selected arbitrarily as permanent shut-down switching tube drive singal or the foundation cutting off power supply, to ensure that power supply obtains protecting more reliably by switch S 1.If be not recorded to the overcurrent signal of corresponding number of times within the latch memory signal time period of correspondence, after the latch memory signal time terminates, the 1st pin of IC4 receives reset signal and resets, and reenters next cycle.
As shown in Figure 4, IC5 is a kind of pulse-width modulation demodulator, and its 16th, 15,2 pin collocation resistance R25, R26, R27, R28, electric capacity C10 forms error amplifier, regulates electric power output voltage.Be placed on the operating frequency of the electric capacity C8 of the 6th pin and the resistance R24 determining modulation demodulator IC5 of the 7th pin.9th, 10 pin output switch pipe drive singal.4th pin of IC5 is pulsewidth dead zone function pin; simultaneously also as the input port of power protection signal and soft start; additional Dead Time can be produced on the output pulse when the 4th pin connects fixing voltage (scope is between 0-3.3V); after being greater than 3.3V, the pulsewidth that the 9th, 10 pin export will turn off completely.During power activation, utilize the characteristic that electrochemical capacitor CE1 voltage can not suddenly change, accessory power supply voltage is by electrochemical capacitor CE1, diode D3 inputs IC5 the 4th pin, and the 4th pin voltage is high level, and then accessory power supply is by electrochemical capacitor CE1, resistance R18 charges to electrochemical capacitor CE1, the voltage of the 4th pin declines gradually, and the 9th, 10 pin export the pulse drive signal launched gradually, realize power supply soft start.Resistance R20, R19 produce branch pressure voltage, as dead zone function voltage.In Power Operating Process; when switching tube there is overcurrent phenomenon; instantaneous protection signal is on the one hand by resistance R22; raise IC5 the 4th pin level fast; turn off drive pulse signal; to be charged to electrochemical capacitor CE2 by resistance R21 on the other hand and be greater than 4V(and consider that diode D5 has the pressure drop of 0.7V); when instantaneous protection signal is eliminated; electricity on electrochemical capacitor CE2 is through diode D5; resistance R23 discharges; the voltage of the 4th pin starts to decline gradually, and the 9th, 10 pin export the pulse drive signal launched gradually, realize the soft start after power protection.
As shown in Figure 2,3; the protection of power supply divide into restorability and irrecoverability protection; after instantaneous protection Puled input is to IC5; there is an instantaneous protection in power supply; when no longer there is over-current phenomenon avoidance in the latch memory signal time period; IC4 resets the signal not exporting and force to close down power supply, and this protection is recoverable.But, when frequently there is over-current phenomenon avoidance within the latch memory signal time period, when reaching the number of times of IC4 corresponding output port, IC4 will export the signal of forcing to close down power supply, in this way, the excess load electric current, the load short circuit current that judge in starting up's electric current, the course of work can effectively be distinguished.Further, instantaneous protection signal response speed is fast, and the protected effect of switch tube clearly.
Claims (5)
1. a double-current defencive function power supply, comprise input starting current testing circuit (1), rated operational current testing circuit (2), current logic decision circuitry (3), switch tube driving circuit (4), it is characterized in that: input starting current testing circuit (1) and rated operational current testing circuit (2) parallel operation, current sampling signal is converted to Logic judgment signal and export to current logic decision circuitry (3), current logic decision circuitry (3) comprehensive descision provides corresponding signal and exports to switch tube driving circuit (4) or latch completely, switch tube driving circuit (4) controls opening and shutoff of power supply major loop switching tube, current logic decision circuitry (3) is if provide complete latch signal, then powered-down work completely.
2. double-current defencive function power supply according to claim 1; it is characterized in that: the pulsed operation current signal on the switching tube detected is through the in-phase input end of resistance R1 input comparator IC1A; compare with the setting fiducial value through resistance R2 input comparator IC1A inverting input, export the Logic judgment signal of response fast.
3. double-current defencive function power supply according to claim 1; it is characterized in that: the resistive-capacitive voltage divider delay circuit that the pulsed operation current signal on the switching tube detected forms through resistance R6, resistance R7 and electric capacity C2; again through the in-phase input end of resistance R9 input comparator IC1B; compare with the setting fiducial value through resistance R10 input comparator TC1B inverting input, export a delayed Logic judgment signal.
4. double-current defencive function power supply according to claim 1, it is characterized in that: after monostable flipflop IC2A and IC3A receives the high level of any one Logic judgment signal, high level signal is launched into the instantaneous protection pulse signal of corresponding time by the time constant of setting and latches memory pulse signal by monostable flipflop; Binary synchronous counter IC4 is according to being recorded to the number of times of corresponding instantaneous protection pulse signal as the foundation disconnecting input power or thorough on-off switching tube drive singal within the latch memory pulse signal effective time period.
5. double-current defencive function power supply according to claim 1, is characterized in that: the dead zone function pin utilizing pulse-width modulation demodulator IC5, and external divider resistance R20 and resistance R19 dividing potential drop form dead zone function voltage during normal work; Realize power supply start soft start to external electric capacity CE1 and resistance R18 discharge and recharge by accessory power supply; Instantaneous protection pulse signal realizes the transient protection of switching tube by the voltage of the dead zone function pin of external resistance R22 rising modulator-demodulator IC5; Instantaneous protection pulse signal is charged to electric capacity CE2 by external resistance R21, and electric capacity CE2 is discharged by resistance R23 again, and the voltage of the dead zone function pin of modulator-demodulator IC5 from high to low, realizes the soft start after there is instantaneous protection in Power Operating Process.
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| CN201520321088.7U CN204615366U (en) | 2015-05-19 | 2015-05-19 | A kind of double-current defencive function power supply |
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| CN201520321088.7U CN204615366U (en) | 2015-05-19 | 2015-05-19 | A kind of double-current defencive function power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108233332A (en) * | 2017-02-17 | 2018-06-29 | 杰华特微电子（杭州）有限公司 | A kind of leakage protection circuit and method |
| CN108649525A (en) * | 2018-03-22 | 2018-10-12 | 帝奥微电子有限公司 | Anti-crosstalk power protecting circuit |
| CN111952938A (en) * | 2020-07-31 | 2020-11-17 | 深圳市信锐网科技术有限公司 | Input protection circuit and method of power supply |
-
2015
- 2015-05-19 CN CN201520321088.7U patent/CN204615366U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108233332A (en) * | 2017-02-17 | 2018-06-29 | 杰华特微电子（杭州）有限公司 | A kind of leakage protection circuit and method |
| CN108649525A (en) * | 2018-03-22 | 2018-10-12 | 帝奥微电子有限公司 | Anti-crosstalk power protecting circuit |
| CN108649525B (en) * | 2018-03-22 | 2024-01-16 | 江苏帝奥微电子股份有限公司 | Crosstalk-proof power supply protection circuit |
| CN111952938A (en) * | 2020-07-31 | 2020-11-17 | 深圳市信锐网科技术有限公司 | Input protection circuit and method of power supply |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150902 Termination date: 20210519 |