CN102025143B - Transient voltage-resistant delay circuit - Google Patents
Transient voltage-resistant delay circuit Download PDFInfo
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- CN102025143B CN102025143B CN 201010537264 CN201010537264A CN102025143B CN 102025143 B CN102025143 B CN 102025143B CN 201010537264 CN201010537264 CN 201010537264 CN 201010537264 A CN201010537264 A CN 201010537264A CN 102025143 B CN102025143 B CN 102025143B
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Abstract
The invention discloses a transient voltage-resistant delay circuit, which comprises a transient voltage protective circuit, a voltage stabilizing circuit, a control circuit, a signal generation circuit, a timing circuit, an output drive circuit and a load protective circuit, wherein the transient voltage protective circuit comprises a transient voltage suppressor (TVS) diode connected in parallel to the circuit to realize positive transient voltage protection and a first fast recovery diode connected in series to the circuit to realize negative transient voltage protection; and the timing circuit counts oscillation signals generated in the signal generation circuit, and determines the product of a counting coefficient and the oscillation period of the oscillation signals as the delay time of the transient voltage-resistant delay circuit to realize the accurate delay of the transient voltage-resistant delay circuit. The transient voltage-resistant delay circuit provided by the invention can realize the positive transient voltage protection and the negative transient voltage protection at the same time of realizing the accurate relay, and has a small volume and high reliability.
Description
Technical field
The present invention relates to a kind of circuit, more particularly, relate to a kind of delay circuit that satisfies anti-transient voltage requirement.
Background technology
In the electrical system (as aircraft engine electrically system) of some engines, for avoiding engine overweight in startup or action momentary load, guarantee engine action smoothly under different conditions, need control starting drive by delay circuit, make each power consumption equipment by corresponding program time-delay power supply, simultaneously, because the influence of the abominable and electromagnetic interference of power-supply system, the general delay circuit herein that requires has the ability of anti-transient voltage, can either bear ± 600V, rising edge/pulsewidth is peak voltage and the anti-80V of 5 μ s/10 μ s, continue the ability of 50ms overvoltage surge.
Existing delay circuit does not all have the function of anti-transient voltage, so under abominable power-supply system and strong electromagnetic interference environment condition, existing delay circuit or can not use, or must improve, add protective circuit in addition.Though the method that adds protective circuit in addition can satisfy the environment for use requirement of delay circuit to a certain extent, often the area of circuit board has increased, the trend of incompatibility electronic equipment small size and high reliability.
Summary of the invention
The purpose of this invention is to provide a kind of delay circuit of anti-transient voltage that integrates time-delay and transient voltage defencive function.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of delay circuit of anti-the transient voltage comprises:
Transient voltage protection circuit, it comprises positive transient voltage protection circuit and negative transient voltage protection circuit: be connected electrically in after other parts in described positive transient voltage protection circuit and this delay circuit are in parallel between power supply and the ground end, it comprises first components and parts of a unipolar protection voltage transient, when the transient voltage of forward takes place, the conducting rapidly of described positive transient voltage protection circuit, thus the high-energy that described forward transient voltage produces is discharged; Be connected electrically in after other parts in described negative transient voltage protection circuit and this delay circuit are in series between power supply and the ground end, it comprises second components and parts of a unidirectional conducting, when the circuit operate as normal, and this second components and parts forward conduction; When the transient voltage of negative sense took place, these second components and parts ended rapidly, disconnect between end and the described negative transient voltage with making, and with protective circuit,
Voltage stabilizing circuit, its voltage with the output of described negative transient voltage protection circuit carries out delivering to control circuit, signal generating circuit and timing circuit after the voltage stabilizing,
Described control circuit comprises a resistance and an electric capacity; Described signal generating circuit comprises a multivibrator and a gate circuit, described gate circuit comprises first input end, second input, the 3rd input and four-input terminal at least, and the output signal of described control circuit is connected to described first input end; The output of the oscillator signal that described multivibrator produces is connected to the 3rd input of described gate circuit; Described timing circuit, in order to control the delay time of this delay circuit of anti-the transient voltage, its output signal is connected to second input of described gate circuit,
When second input of the first input end of described gate circuit and described gate circuit is low level, the output of described gate circuit is identical with the output signal of described multivibrator, this oscillator signal is sent to the timing circuit with tally function, each cycle of described oscillator signal is counted a number, after counting satisfies the requirement of delay time, the input signal of described second input is that the output signal of described timing circuit becomes high level, this moment, the output signal of described gate circuit was low level, the oscillator signal of described multivibrator output is blocked
Described delay time is the integral multiple of the cycle of oscillation of the oscillator signal that produces of described multivibrator,
Output driving circuit, its output signal to described timing circuit is amplified,
Load protection circuit is in order to protect inductive load and to weaken the load spike.
Preferably, described first components and parts are TVS pipe, and described second components and parts are a fast recovery diode.
Preferably, described gate circuit is the NOR gate with first input end, second input, the 3rd input and four-input terminal, further, is serially connected with time delay resistance between described four-input terminal and the ground end.
Preferably, described voltage stabilizing circuit comprises a temperature-compensating voltage stabilizing didoe and first transistor, described temperature-compensating voltage stabilizing didoe is connected between the base stage and ground end of described first transistor, the collector terminal of this first transistor is connected to power supply, be connected with first resistance between the base stage of this first transistor and the power supply, be connected with second resistance between the emitter of this first transistor and the ground end, draw the output voltage of this voltage stabilizing circuit from the emitter of described first transistor.
Preferably, described timing circuit comprises a counter, and the product of the cycle of oscillation of the oscillator signal that the counting coefficient of this counter and described multivibrator produce is described delay time.
Preferably, described output driving circuit comprises that one is used for second transistor that the output signal of described timing circuit is swung to and a Darlington transistor that is connected electrically in the collector electrode of this second transistor by a resistance.
Preferably, lead to a test lead of this delay circuit of anti-the transient voltage at the output of described signal generating circuit.
The invention has the beneficial effects as follows:
1. be connected electrically in the TVS pipe of the unipolar protection voltage transient between power supply and the ground end after utilization of the present invention and this delay circuit are in parallel when the transient voltage of forward takes place, the conducting rapidly of this protective circuit, thus the high-energy that the forward transient voltage produces is discharged; After being in series, utilization and this delay circuit be connected electrically in the fast recovery diode forward conduction when the circuit operate as normal between power supply and the ground end; When the transient voltage of negative sense took place, this fast recovery diode ended rapidly, disconnected between end and the described negative transient voltage, with protective circuit with making;
2. the present invention's oscillator signal of utilizing counter that multivibrator is produced counts to realize the function of delaying time, the product of the counting coefficient of counter and the cycle of oscillation of oscillator signal is the delay time of this delay circuit of anti-the transient voltage, can make this delay circuit of anti-the transient voltage realize accurate delay;
Among the present invention the TVS in the anti-transient voltage protection circuit choose the volume of having considered device in the factor; under the condition that other performance parameters meet the demands, select little one of volume; make that the volume of entire circuit is little; and TVS pipe response is fast, noiseless, price are low, has improved the reliability of this delay circuit of anti-the transient voltage.
Description of drawings
Accompanying drawing 3 is the schematic diagram of control circuit in the delay circuit of anti-transient voltage the of the present invention;
Accompanying drawing 4 is the schematic diagram (not shown time delay resistance) of signal generating circuit in the delay circuit of anti-transient voltage the of the present invention;
Accompanying drawing 6 is the schematic diagram of transient voltage protection circuit in the delay circuit of anti-transient voltage the of the present invention;
Accompanying drawing 7 is the schematic diagram of output driving circuit in the delay circuit of anti-transient voltage the of the present invention;
Accompanying drawing 8 is the schematic diagram of load protection circuit in the delay circuit of anti-transient voltage the of the present invention.
In the accompanying drawing: 1, transient voltage protection circuit; 2, voltage stabilizing circuit; 3, control circuit;
4, signal generating circuit; 5, timing circuit;
6, output driving circuit; 7, load protection circuit;
8, first not gate; 9, second not gate.
Embodiment
Below in conjunction with embodiment shown in the drawings technical scheme of the present invention is done following detailed description the in detail:
As shown in Figure 1, the delay circuit of anti-transient voltage the of the present invention comprises transient voltage protection circuit 1, voltage stabilizing circuit 2, control circuit 3, signal generating circuit 4, timing circuit 5, output driving circuit 6 and load protection circuit 7.
As shown in Figure 2, voltage stabilizing circuit 2 comprises the first transistor V1 and temperature-compensating voltage stabilizing didoe V2, the base stage of this first transistor V1 is electrically connected to the power supply VCC of 28V, be electrically connected with first resistance R 1 between the base stage of power supply VCC and the first transistor V1, temperature-compensating voltage stabilizing didoe V2 is connected electrically between the base stage and ground end of the first transistor V1, be electrically connected with second resistance R 2 that is in parallel with temperature-compensating voltage stabilizing didoe V2 between the emitter of the first transistor V1 and the ground end, draw burning voltage VDD from the emitter of the first transistor V1, the first transistor V1 wherein is the NPN type, and this voltage stabilizing circuit 2 is delivered to the control circuit 3 shown in the accompanying drawing 3 respectively with the voltage after the voltage stabilizing, timing circuit 5 shown in signal generating circuit 4 shown in the accompanying drawing 4 and the accompanying drawing 5.
As shown in Figure 3, control circuit 3 is in series by capacitor C 1 and the 3rd resistance R 3 and forms, from the output signal that point is drawn control circuit 3 that is connected in series between capacitor C 1 and the 3rd resistance R 3, when just powering on, because the voltage at capacitor C 1 two ends can not suddenly change, so the output signal of control circuit 3 is high level, after a period of time, capacitor C 1 is recharged, so the output signal of this control circuit 3 becomes low level.
As shown in Figure 4, signal generating circuit 4 comprises a NOR gate and a multivibrator, this NOR gate has first input end, second input, the 3rd input and four-input terminal, first input end is electrically connected to the output signal of the control circuit 3 shown in the accompanying drawing 3, second input is electrically connected to the output of the timing circuit 5 shown in the accompanying drawing 5, the 3rd input is by the output of the oscillator signal of multivibrator, be electrically connected a time delay resistance R0 (seeing in the accompanying drawing 1) between four-input terminal and the ground end, this time delay resistance R0 is a variable resistance; Multivibrator is by first not gate 8, second not gate 9, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8 and the 9th resistance R 9 and a low frequency Leaded Ceramic Disc Capacitor Ct form, first not gate 8, second not gate 9, low frequency Leaded Ceramic Disc Capacitor Ct and the 6th resistance R 6 are connected successively, between serial connection point between first not gate 8 and second not gate 9 and low frequency Leaded Ceramic Disc Capacitor Ct and the 6th resistance R 6 be connected in series a little between be electrically connected with the 8th resistance R 8 and the 9th resistance R 9 that is in series, the 7th resistance R 7 be connected electrically between serial connection point and second not gate 9 and the low frequency Leaded Ceramic Disc Capacitor Ct between the 8th resistance R 8 and the 9th resistance R 9 be connected in series a little between, be connected in series the output that point is drawn oscillator signal between second not gate 9 and the low frequency Leaded Ceramic Disc Capacitor Ct, and be connected to the 3rd input of NOR gate, wherein the 9th resistance R 9 is a variable resistance.
As shown in Figure 5, timing circuit 5 comprises a counter chip D1, the power end of this counter chip D1 is connected to the output voltage V DD of voltage stabilizing circuit 2, output, the GND that clock signal terminal CLK is electrically connected to signal generating circuit 4 and holds earth terminal, output OUT output signal is delivered to the input of accompanying drawing 7 output driving circuits 6, this counter chip D1 has a counting coefficient, and the product of the cycle of oscillation of the oscillator signal that produces in this counting coefficient and the signal generating circuit 4 is the delay time of circuit of the present invention.
As shown in Figure 7, output driving circuit 6 comprises the second transistor V5 that emitter is held with being connected to, the base stage of this second transistor V5 is connected in series the output signal that the 11 resistance is connected to timing circuit 5 afterwards, the second transistor V5 swings to the output signal of timing circuit 5, the base stage that connects a Darlington transistor after collector series connection the 14 resistance R 14 of the second transistor V5, be serially connected with the second fast recovery diode V4 between the base stage of power supply VCC and Darlington transistor successively, the 12 resistance R 12 and the 13 resistance R 13, this Darlington transistor is connected to form by last transistor V7 and back one transistor V6 collector electrode, the emitter of last transistor V7 links to each other with the base stage of back one transistor V6, the emitter of last transistor V7 is connected to being connected in series a little of the 12 resistance R 12 and the 13 resistance R 13, the emitter of back one transistor V6 is connected to being connected in series a little of the second fast recovery diode V4 and the 12 resistance R 12, and the output of this output driving circuit 6 is drawn from the collector electrode of Darlington transistor.
As shown in Figure 8, load protection circuit 7 comprises the first fly-wheel diode V8 and a voltage stabilizing didoe V10, and the first fly-wheel diode V8 oppositely is connected in series the back with voltage stabilizing didoe V10 and is in parallel with load circuit.
As shown in Figure 6, transient voltage protection circuit 1 comprises positive transient voltage protection circuit and negative transient voltage protection circuit: be connected electrically in after other parts in positive transient voltage protection circuit and this delay circuit are in parallel between power supply and the ground end, it comprises the TVS pipe V12 of a unipolar protection voltage transient, when the transient voltage of forward (+when 600V) taking place, the conducting rapidly of described positive transient voltage protection circuit, thus the high-energy that described forward transient voltage produces is discharged; After being in series, other parts in described negative transient voltage protection circuit and this delay circuit are connected electrically between power supply and the ground end, it comprises the first fast recovery diode V11 of a unidirectional conducting, when the circuit operate as normal, this first fast recovery diode V11 forward conduction; When the transient voltage of negative sense (when 600V) taking place, this first fast recovery diode V11 ends rapidly, hold with making and described negative transient voltage between disconnect, with protective circuit.
The core of transient voltage protection circuit 1 is to choose the as far as possible little TVS pipe V12 of volume, so that the volume of whole delay circuit reduces.At first determine minimum break-down voltage and the maximum clamping voltage of TVS pipe V12; for the 28V DC power-supply system; if only consider its power supply is carried out anti-peak voltage protection; then choosing specified reverse shutoff voltage VR is 33V; puncture voltage VBR is that the TVS pipe V12 about 36V is just passable; but consider the requirement of the surge of anti-the overvoltage; be that circuit also will satisfy the 80V direct current; continue the overvoltage surge impact of 50ms and do not break down; so the reverse shutoff voltage of the TVS that chooses pipe V12 should be greater than 80V, otherwise 80V direct current; the overvoltage surge of lasting 50ms may be managed V12 with TVS and be burnt out.The TVS pipe V12 minimum break-down voltage that the present invention chooses is 86V, and its maximum clamping voltage is 126V.
After minimum break-down voltage was determined, what need consideration was the power of TVS pipe V12.Be the TVS pipe of 126V for maximum clamping voltage, the peak pulse power of the spike generator that bears is:
P
PPM＝V·I＝126×(600-126)/50＝1194.48W；
30s sends out 50 pulses, and the rising edge/pulsewidth of pulse is 5 μ s/10 μ s, and pulse duty factor is:
η＝50×10×10
-6/30×100％＝0.00167％；
Average steady state power is:
P＝P
PPM·η＝1194.48×0.00167％＝0.0199W。
A peak pulse power is the TVS of 600W, and its rising edge of a pulse/pulsewidth is 10 μ s/1000 μ s, and the average steady state power that it can bear in 30s is:
P＝P
PPM·η＝600×1000×10
-6/30＝0.02W。
The average steady state power of the average steady state power that the TVS that plan is chosen bears and the TVS of 600W is suitable.Therefore, it is that 600W, minimum break-down voltage are 86V that protection device of the present invention is chosen peak pulse power, and maximum clamping voltage is the TVS pipe V12 of the small size of 126V.
After being in parallel, utilization of the present invention and this delay circuit be connected electrically in the TVS pipe V12 of the unipolar protection voltage transient between power supply and the ground end when the transient voltage of forward takes place, the conducting rapidly of this protective circuit, thus the high-energy that the forward transient voltage produces is discharged; After being in series, utilization and this delay circuit be connected electrically in the first fast recovery diode V11 forward conduction when the circuit operate as normal between power supply and the ground end; When the transient voltage of negative sense took place, the first fast recovery diode V11 ended rapidly, disconnected between end and the described negative transient voltage, with protective circuit with making.
The oscillator signal that the present invention utilizes counter that multivibrator is produced counts to realize the function of delaying time, the product of the counting coefficient of counter and the cycle of oscillation of oscillator signal is the delay time of this delay circuit of anti-the transient voltage, can make this delay circuit of anti-the transient voltage realize accurate delay.
The delay circuit of anti-transient voltage reliability height of the present invention, volume are little, are fit to promote the use of.
Above-described embodiment only is explanation technical conceive of the present invention and characteristics, and its purpose is to allow the personage who is familiar with this technology can understand content of the present invention and enforcement according to this, can not limit protection scope of the present invention with this.All equivalences that spirit is done according to the present invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (9)
1. delay circuit of anti-the transient voltage is characterized in that: comprising:
Transient voltage protection circuit, it comprises positive transient voltage protection circuit and negative transient voltage protection circuit: be connected electrically in after other parts in described positive transient voltage protection circuit and this delay circuit are in parallel between power supply and the ground end, it comprises first components and parts of a unipolar protection voltage transient, when the transient voltage of forward takes place, the conducting rapidly of described positive transient voltage protection circuit, thus the high-energy that described forward transient voltage produces is discharged; Be connected electrically in after other parts in described negative transient voltage protection circuit and this delay circuit are in series between power supply and the ground end, it comprises second components and parts of a unidirectional conducting, when the circuit operate as normal, and this second components and parts forward conduction; When the transient voltage of negative sense took place, these second components and parts ended rapidly, disconnect between the transient voltage of end and described negative sense with making, and with protective circuit,
Voltage stabilizing circuit, its voltage with the output of described negative transient voltage protection circuit carries out delivering to control circuit, signal generating circuit and timing circuit after the voltage stabilizing,
Described control circuit comprises a resistance and an electric capacity; Described signal generating circuit comprises a multivibrator and a gate circuit, described gate circuit comprises first input end, second input, the 3rd input and four-input terminal at least, and the output signal of described control circuit is connected to described first input end; The output of the oscillator signal that described multivibrator produces is connected to the 3rd input of described gate circuit; Described timing circuit, in order to control the delay time of this delay circuit of anti-the transient voltage, its output signal is connected to second input of described gate circuit,
When second input of the first input end of described gate circuit and described gate circuit is low level, the output of described gate circuit is identical with the output signal of described multivibrator, this oscillator signal is sent to the timing circuit with tally function, each cycle of described oscillator signal is counted a number, after counting satisfies the requirement of delay time, the input signal of described second input is that the output signal of described timing circuit becomes high level, this moment, the output signal of described gate circuit was low level, the oscillator signal of described multivibrator output is blocked
Described delay time is the integral multiple of the cycle of oscillation of the oscillator signal that produces of described multivibrator,
Output driving circuit, its output signal to described timing circuit is amplified,
Load protection circuit is in order to protect inductive load and to weaken the load spike.
2. a kind of delay circuit of anti-transient voltage the according to claim 1 is characterized in that: described first components and parts are TVS pipe.
3. a kind of delay circuit of anti-transient voltage the according to claim 1, it is characterized in that: described second components and parts are a fast recovery diode.
4. a kind of delay circuit of anti-transient voltage the according to claim 1, it is characterized in that: described gate circuit is the NOR gate with first input end, second input, the 3rd input and four-input terminal.
5. according to claim 1 or 4 described a kind of delay circuits of anti-the transient voltage, it is characterized in that: be serially connected with time delay resistance between described four-input terminal and the ground end.
6. a kind of delay circuit of anti-transient voltage the according to claim 1, it is characterized in that: described voltage stabilizing circuit comprises a temperature-compensating voltage stabilizing didoe and first transistor, described temperature-compensating voltage stabilizing didoe is connected between the base stage and ground end of described first transistor, the collector terminal of this first transistor is connected to power supply, be connected with first resistance between the base stage of this first transistor and the power supply, be connected with second resistance between the emitter of this first transistor and the ground end, draw the output voltage of this voltage stabilizing circuit from the emitter of described first transistor.
7. a kind of delay circuit of anti-transient voltage the according to claim 1, it is characterized in that: described timing circuit comprises a counter, and the product of the cycle of oscillation of the oscillator signal that the counting coefficient of this counter and described multivibrator produce is described delay time.
8. a kind of delay circuit of anti-transient voltage the according to claim 1 is characterized in that: described output driving circuit comprises that one is used for second transistor that the output signal of described timing circuit is swung to and a Darlington transistor that is connected electrically in the collector electrode of this second transistor by a resistance.
9. a kind of delay circuit of anti-transient voltage the according to claim 1 is characterized in that: a test lead that leads to this delay circuit of anti-the transient voltage at the output of described signal generating circuit.
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| CN 201010537264 CN102025143B (en) | 2010-11-10 | 2010-11-10 | Transient voltage-resistant delay circuit |
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| CN 201010537264 CN102025143B (en) | 2010-11-10 | 2010-11-10 | Transient voltage-resistant delay circuit |
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| CN102025143B true CN102025143B (en) | 2013-07-03 |
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| CN103186395A (en) * | 2011-12-30 | 2013-07-03 | 北京谊安医疗系统股份有限公司 | Hardware version information identification system |
| CN103762968B (en) * | 2014-01-26 | 2017-09-15 | 深圳Tcl新技术有限公司 | Condenser type touch-switch, on-off circuit and key system |
| CN109066627B (en) * | 2017-08-21 | 2020-02-14 | 福州福大海矽微电子有限公司 | Protection circuit for hot plug detection port with HPD and ESD |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2045154U (en) * | 1988-11-22 | 1989-09-27 | 溧阳县清安五金电器厂 | Integrated-circuit protective device for air conditioner |
| US5719734A (en) * | 1994-09-16 | 1998-02-17 | Morton International, Inc. | Electronic apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20100111093A (en) * | 2009-04-06 | 2010-10-14 | 삼성전자주식회사 | Protecting circuit for semiconductor circuit from esd and eos |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2045154U (en) * | 1988-11-22 | 1989-09-27 | 溧阳县清安五金电器厂 | Integrated-circuit protective device for air conditioner |
| US5719734A (en) * | 1994-09-16 | 1998-02-17 | Morton International, Inc. | Electronic apparatus |
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