CN105356863B - A kind of fast recovery detection delay circuit with monostable step response - Google Patents
A kind of fast recovery detection delay circuit with monostable step response Download PDFInfo
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- CN105356863B CN105356863B CN201510631243.XA CN201510631243A CN105356863B CN 105356863 B CN105356863 B CN 105356863B CN 201510631243 A CN201510631243 A CN 201510631243A CN 105356863 B CN105356863 B CN 105356863B
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- circuit
- resistance
- monostable
- delay circuit
- output terminal
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/023—Generators characterised by the type of circuit or by the means used for producing pulses by the use of differential amplifiers or comparators, with internal or external positive feedback
- H03K3/0232—Monostable circuits
Abstract
Recover detection delay circuit the present invention provides a kind of fast with monostable step response, including input terminal, often control circuit, comparison circuit, reset circuit and output terminal；The input terminal is connected by control circuit often and comparison circuit with output terminal, and one end ground connection of the reset circuit, another signal end is connected with comparison circuit output terminal.The lag characteristic that the present invention has transient state triggering and keeps transient state to export, the time delay has the characteristic stablized and can customize setting, the thresholding trigger voltage of the present invention can freely set by adjusting V2, this causes the present invention to be widely used as monostable circuit in burst pulse shaping, in delay and timing circuit, it can be used in again in protection circuit system, if the present invention is with the protection circuit, the detection and delay that superior performance is provided for protection circuit of the clever sum of its energy, when its notice system needs to cut off the power protection, it will provide reliable guard delay at the same time, so as to improve the stability of system.
Description
Technical field
The present invention relates to detection delay circuit technical field, and in particular to a kind of fast recovery detection with monostable step response
Delay circuit.
Background technology
Monostable circuit (making monostable circuit using digital device, below all abbreviation monostable circuits) can input
The lower output transient state of instantaneously triggering at end, and stable state is exported after transient state is exported maintenance a period of time, and this period maintained is not
Influenced by trigger signal amplitude, this characteristic causes single-shot trigger circuit to be widely used in shaping pulse, delay and determine
When circuit in.Outside the characteristic of monostable circuit possessed by usual monostable circuit, its difference is, monostable circuit
Threshold voltage can not by the arbitrary adjusting of designer, this prevent monostable circuit from be widely used for for protection circuit do
Detection.However, for protecting circuit, if system make cut off the power protection when, can be in situation about not postponing necessarily
Under just restore electricity immediately if, the stability of this system is insecure, and the present invention is whole with monostable circuit
Advantage, while the shortcomings that also compensate for above-mentioned monostable circuit, this causes the present invention to be used as monostable circuit, also
It can use in the protection circuit, so as to improve the stability of system.
The content of the invention
In order to solve the above technical problems, the present invention provides a kind of fast recovery detection deferred telegram with monostable step response
Road, should pass through control circuit often, comparison circuit, reset circuit, defeated with the fast detection delay circuit that recovers of monostable step response
Enter end and output terminal composition, input terminal is connected by control circuit often and comparison circuit with output terminal, the reset circuit
One end is grounded, and another signal end is connected with comparison circuit output terminal.
The present invention is achieved by the following technical programs.
A kind of fast with monostable step response provided by the invention recovers detection delay circuit, including often control circuit,
Comparison circuit and reset circuit, one end of the comparison circuit are connected with input terminal, and the other end is connected with output terminal；It is described often
Control circuit is parallel to comparison circuit after connecting with reset circuit and connects section.
The reset circuit includes diode D1, resistance R3, capacitance C1, resistance R4, diode D1, capacitance C1 and resistance R4
Be sequentially connected in series the positive terminal ground connection of rear diode D1, the output terminal of the other end of resistance R4 and comparison circuit connects, resistance R3 with
Diode D1 is in parallel.
Often one end that the control circuit includes resistance R1, resistance R3, resistance R2, C1 and diode D2, resistance R1 connects
Voltage V1 is met, the other end is connected with capacitance C1；Cathode of the capacitance C1 other ends respectively with resistance R3 and diode D2 is connected, resistance
The other end ground connection of R3, the anode of diode D2 are connected by resistance R2 with delay circuit input terminal；The anode of diode D2 is also
It is connected with the input terminal of comparison circuit.
The comparison circuit includes comparator U1A, and the in-phase input end of comparator U1A is defeated by resistance R2 and delay circuit
Enter end connection, reverse input end is connected with reference voltage V2；The output terminal of comparator U1A directly connects with the output terminal of delay circuit
Connect, or the output terminal after series resistance again with delay circuit is connected.
The resistance R4 is replaced with short-circuit line.
The diode D1 open circuits, resistance R4 are replaced with short-circuit line.
The resistance R3 open circuits.
The resistance R1 open circuits.
That one end that the resistance R1 is connected with capacitance C1 is connected to the output terminal of delay circuit.
The comparator U1A is comparator chip or operational amplifier.
The beneficial effects of the present invention are：The lag characteristic that the present invention has transient state triggering and keeps transient state to export, it is described
Time delay and input also have the characteristic stablized and can customize setting, and in addition thresholding trigger voltage of the invention can also pass through tune
Whole V2 is freely set, this causes the present invention to be widely used as single-shot trigger circuit in burst pulse shaping, delay
In timing electricity Deng roads, and it can be used in protection circuit system, if moreover, of the invention with the protection circuit, it can also
The detection and delay that superior performance is provided for protection circuit of clever sum, when its notice system needs to cut off the power protection, it will
Reliable guard delay is provided at the same time, so as to improve the stability of system.
Brief description of the drawings
Fig. 1 is the principle of the present invention block diagram；
Fig. 2 is the circuit diagram in Fig. 1.
Embodiment
Be described further below technical scheme, but claimed scope be not limited to it is described.
A kind of fast recovery detection delay circuit with monostable step response as shown in Fig. 1~2, including electricity is controlled often
Road, comparison circuit and reset circuit, one end of the comparison circuit are connected with input terminal, and the other end is connected with output terminal；It is described
Often comparison circuit is parallel to after control circuit is connected with reset circuit and connects section.
The reset circuit includes diode D1, resistance R3, capacitance C1, resistance R4, diode D1, capacitance C1 and resistance R4
Be sequentially connected in series the positive terminal ground connection of rear diode D1, the output terminal of the other end of resistance R4 and comparison circuit connects, resistance R3 with
Diode D1 is in parallel.
Often one end that the control circuit includes resistance R1, resistance R3, resistance R2, C1 and diode D2, resistance R1 connects
Voltage V1 is met, the other end is connected with capacitance C1；Cathode of the capacitance C1 other ends respectively with resistance R3 and diode D2 is connected, resistance
The other end ground connection of R3, the anode of diode D2 are connected by resistance R2 with delay circuit input terminal；The anode of diode D2 is also
It is connected with the input terminal of comparison circuit.
The comparison circuit includes comparator U1A, and the in-phase input end of comparator U1A is defeated by resistance R2 and delay circuit
Enter end connection, reverse input end is connected with reference voltage V2；The output terminal of comparator U1A directly connects with the output terminal of delay circuit
Connect, or the output terminal after series resistance again with delay circuit is connected.
The resistance R4 is replaced with short-circuit line.When the dash current of C1 electric discharges does not interfere with the stability of comparator U1A,
R4 can be replaced with short-circuit line.
The diode D1 open circuits, resistance R4 are replaced with short-circuit line., can not when system need not reset very short time
Using diode D1 (diode D1 open circuits), and resistance R4 is replaced with short-circuit line, is the structure of circuit according to the present invention, and R4 is
For current limliting, when comparison circuit is exporting low level, there is the presence of R4, it can be ensured that will not by the produced resetting currents of C1
There is too big moment impact electric current, this is set to optimize the characteristic of circuit, and the C1 capacity in the present invention usually may be selected
It is smaller, in this case, the stability of system, therefore this hair are not interfered with usually by the impact of the produced resetting currents of C1
The usually available short-circuit lines of R4 in bright replace.
The resistance R3 open circuits., can not when the output impedance for outputing signal to the circuit of input terminal of the present invention is relatively low
Using the resistance R3 (resistance R3 open circuits) being connected in parallel on diode D1, at this moment C1 can be charged by R2, at this moment adjust R2 and often
The other elements parameter of control circuit, can also reach the Expected Results of the present invention.
The resistance R1 open circuits.When comparator U1A uses amplifier, since amplifier has output voltage and electric current in itself
Ability, from the principle of the present invention, R1 can be without using directly opening a way.
That one end that the resistance R1 is connected with capacitance C1 is connected to the output terminal of delay circuit.When U1A is comparator,
Characteristic during the output high level of comparator chip is substantially comparator output high-impedance state, at this moment equivalent to the output of comparator
End open circuit, therefore according to described in this, resistance R1 is connect into that one end reconfiguration of C1 to the output terminal or delay circuit of comparator
Output terminal change, the essence of its operation principle do not change.
The comparator U1A is comparator chip or operational amplifier.
When the comparison circuit U1A is using comparator chip, its course of work is as follows, when the input of input terminal is believed
During number reference voltage V2 connect less than comparator reverse input end, comparator U1A will export low level, when the voltage of input terminal
When meeting and exceeding reference voltage V2, comparator U1A will export high resistant for rise, then by voltage V1 by resistance R1 pull up and for
High level, meanwhile, capacitance C1 is charged by the other elements of control circuit often, and when capacitance C1 is just started to charge up, its impedance is very
It is small, short circuit can be ideally regarded as, at this time, if the voltage of input terminal suddenly becomes low level, the homophase input of comparator U1A
End is as the charging of capacitance C1 acts on and is kept above the reference voltage V2 of comparator U1A reverse input ends so that compares
Device U1A persistently exports high level, and as the continuous charging of capacitance C1, the voltage at capacitance C1 both ends are continuously increased, capacitance C1 fills
Electric current can constantly reduce, in the case where level dimension of no input terminal input higher than reference voltage V2 is continuous, by Ohm's law
Understand, the homophase input terminal voltage of U1A will be reduced constantly, when this voltage is reduced to the reference of comparator U1A reverse input ends
During below voltage V2, comparator U1A will recover to export low level, and capacitance C1 will carry out discharge reduction by reset circuit at this time,
Prepare for next cycle.
Further, since the reverse blocking effect of diode D2, persistently reverse higher than comparator U1A in the voltage of input terminal
During the reference voltage V2 of input terminal, output terminal will continue output high level, and the effect of this characteristic be, if the circuit with
In the protection circuit, and be sent into input terminal signal be unprotected circuit whether the signal for acting and being affected, it is described
Characteristic can make the present invention be used in such protection circuit detects it is similarly safe and reliable, such as, if the present invention for pair
System input voltage is excessive and makes detection protection, then, in the voltage persistently reverse input higher than comparator U1A of input terminal
During the reference voltage V2 at end, output terminal will continue to export this characteristic of high level, will same energy safeguards system safety.
Due to the rate of climb and capacitance C1 of the capacitance C1 both end voltages capacity and charge circuit of itself impedance and fill
Piezoelectric voltage is related, so holding time for high level can be exported to adjust comparator U1A by adjusting control circuit often, full
In the case of can be without using the resistance R3 (resistance R3 open circuits) being connected in parallel on diode D1, U1A can be controlled by adjusting R2
Output high level is held time.Likewise, when needing to carry out repid discharge reset to capacitance C1, electricity can be resetted by reducing
The impedance on road improves the velocity of discharge of capacitance C1.Therefore, the electric discharge recovery of capacitance C1 can be increased substantially by adding diode D1
Speed.Since the charging rate and the velocity of discharge of capacitance C1 are all the parameters by control circuit often and reset circuit in itself respectively
Determine, this make it that output terminal can keep output certain time well to the present invention when being subject to the transient state of input terminal to trigger
High level, and it exports the time of high level, can be adjusted by control circuit often.In addition, allowing capacitance C1 discharge reductions
Returning to time of initial state can also adjust by adjusting the parameter of reset circuit, when adding diode D1, and capacitance C1
Capacity and resistance R4 impedance all very little when, the reset of capacitance C1 is very fast.
When the comparison circuit U1A makes comparisons device using amplifier chip, since resistance R1 has output height in itself
The ability of level, so resistance R1 can be deleted, allows it to open a way, other operation principles and above-mentioned comparison circuit at resistance R1
U1A make comparisons using amplifier chip device when operation principle be the same, therefore be not repeated.
The detection and delay of protecting circuit system are specifically described as an example below, such as the direct current being widely used
Brushless electric machine is typically to be driven with H bridges, and DC brushless motor is ordinarily connected to form on the power switch pipe of H, and passes through driving
Form H power switch pipe come to DC brushless motor provide power supply, when the DC brushless motor overload when, by it
Electric current will constantly increase, and the electric current such as is passed through sampling resistor, then from Ohm's law I=U/R, the sampling resistor
On voltage can also rise, if by the voltage be sent to the present invention input terminal detect, output terminal be sent to system protection drive
Dynamic circuit, then when the motor operation irregularity, when being raised to a certain extent by the electric current of the DC brushless motor, be sent into
The voltage of input terminal of the present invention will exceed set Secure Threshold voltage V2, and (V2 can be by the data that calculate or test
To set), then output terminal will export high level notice system protection drive circuit, and allow its shut-off to drive the brush DC
Power of motor switching tube, so as to cut off the power supply of the DC brushless motor, at this moment, from above-mentioned principle, even it is described straight
Stream brushless electric machine allows electric current rapid decrease because of power supply is not obtained, and the voltage down to input terminal is less than V2, and output terminal also can
The high level of lasting output a period of time, allows system not power within lasting this period to the DC brushless motor,
Thus it is unlikely to the power supply for allowing system just to cut off the DC brushless motor, and recovers to supply the DC brushless motor immediately
Electricity, to reach the safety for the DC brushless motor that adequately protects.
Can freely it be adjusted due to duration of the present invention with output terminal output high level and threshold voltage V2
Feature so that the present invention can allow system quickly can make the safeguard protection cut off the power for load but also recover in time to load
Energy supply, therefore the present invention is such as used to the protection detection circuit of motor driver, it can allow motor to obtain safe protection,
The ability with dynamic load can be broken into greatest extent again.If by the present invention with the protection circuit, it can be that protection circuit carries
For the detection and delay of superior performance, make system reliable and stable.
Claims (9)
1. a kind of fast recovery detection delay circuit with monostable step response, including control circuit, comparison circuit and reset often
Circuit, it is characterised in that：One end of the comparison circuit is connected with input terminal, and the other end is connected with output terminal；It is described to control often
Circuit processed is parallel to comparison circuit after connecting with reset circuit and connects section；Often the control circuit includes resistance R1, resistance R3, electricity
One end connection voltage V1 of R2, C1 and diode D2, resistance R1 are hindered, the other end is connected with capacitance C1；The capacitance C1 other ends are distinguished
It is connected with the cathode of resistance R3 and diode D2, the other end of resistance R3 ground connection, the anode of diode D2 is by resistance R2 with prolonging
Slow circuit input end connection；The anode of diode D2 is also connected with the input terminal of comparison circuit.
2. the fast recovery detection delay circuit with monostable step response as claimed in claim 1, it is characterised in that：The reset
Circuit includes diode D1, resistance R3, capacitance C1, resistance R4, and diode D1, capacitance C1 and resistance R4 are sequentially connected in series rear diode
The positive terminal ground connection of D1, the other end of resistance R4 and the output terminal of comparison circuit connect, and resistance R3 is in parallel with diode D1.
3. the fast recovery detection delay circuit with monostable step response as claimed in claim 1, it is characterised in that：The comparison
Circuit includes comparator U1A, and the in-phase input end of comparator U1A is connected by resistance R2 with delay circuit input terminal, reversely defeated
Enter end to be connected with reference voltage V2；The output terminal of comparator U1A is directly connected with the output terminal of delay circuit, or after series resistance
It is connected again with the output terminal of delay circuit.
4. the fast recovery detection delay circuit with monostable step response as claimed in claim 2, it is characterised in that：The resistance
R4 is replaced with short-circuit line.
5. the fast recovery detection delay circuit with monostable step response as claimed in claim 2, it is characterised in that：Two pole
Pipe D1 opens a way, and resistance R4 is replaced with short-circuit line.
6. the fast recovery detection delay circuit with monostable step response as claimed in claim 1 or 2, it is characterised in that：It is described
Resistance R3 opens a way.
7. the fast recovery detection delay circuit with monostable step response as claimed in claim 1, it is characterised in that：The resistance
R1 opens a way.
8. the fast recovery detection delay circuit with monostable step response as claimed in claim 1, it is characterised in that：The resistance
That one end that R1 is connected with capacitance C1 is connected to the output terminal of delay circuit.
9. the fast recovery detection delay circuit with monostable step response as claimed in claim 3, it is characterised in that：The comparison
Device U1A is comparator chip or operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510631243.XA CN105356863B (en) | 2015-09-29 | 2015-09-29 | A kind of fast recovery detection delay circuit with monostable step response |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510631243.XA CN105356863B (en) | 2015-09-29 | 2015-09-29 | A kind of fast recovery detection delay circuit with monostable step response |
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| Publication Number | Publication Date |
|---|---|
| CN105356863A CN105356863A (en) | 2016-02-24 |
| CN105356863B true CN105356863B (en) | 2018-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510631243.XA Active CN105356863B (en) | 2015-09-29 | 2015-09-29 | A kind of fast recovery detection delay circuit with monostable step response |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107769149B (en) * | 2017-09-18 | 2019-10-29 | 广州地铁集团有限公司 | A kind of customized defencive function implementation method of relay equipment based on internal data |
| CN114362094B (en) * | 2021-12-22 | 2023-05-16 | 核工业西南物理研究院 | Overcurrent protection circuit for fast recovery high-voltage power supply system |
| CN116559520B (en) * | 2023-02-15 | 2023-10-17 | 海的电子科技(苏州)有限公司 | Voltage signal detection method, device and storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1829031A (en) * | 2005-03-03 | 2006-09-06 | 中兴通讯股份有限公司 | Short-circuit protection circuit with self-recovering function |
| CN102496903A (en) * | 2011-11-15 | 2012-06-13 | 深圳桑达国际电子器件有限公司 | Over-current protection circuit, power supply circuit and power supply |
| CN202472326U (en) * | 2012-03-21 | 2012-10-03 | 成都前锋电子有限责任公司 | Monostable protection circuit and automatic water heater control circuit |
| CN103138716A (en) * | 2013-01-31 | 2013-06-05 | 深圳威迈斯电源有限公司 | Power down triggered monostable protection circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8464078B2 (en) * | 2008-01-22 | 2013-06-11 | Hewlett-Packard Development Company, L.P. | Delay circuit with reset feature |
-
2015
- 2015-09-29 CN CN201510631243.XA patent/CN105356863B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1829031A (en) * | 2005-03-03 | 2006-09-06 | 中兴通讯股份有限公司 | Short-circuit protection circuit with self-recovering function |
| CN102496903A (en) * | 2011-11-15 | 2012-06-13 | 深圳桑达国际电子器件有限公司 | Over-current protection circuit, power supply circuit and power supply |
| CN202472326U (en) * | 2012-03-21 | 2012-10-03 | 成都前锋电子有限责任公司 | Monostable protection circuit and automatic water heater control circuit |
| CN103138716A (en) * | 2013-01-31 | 2013-06-05 | 深圳威迈斯电源有限公司 | Power down triggered monostable protection circuit |
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| CN105356863A (en) | 2016-02-24 |
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Effective date of registration: 20200612 Address after: Room 406, 4 / F, building 101, No. 3, electronic West Street, electronic industrial park, Yanta District, Xi'an City, Shaanxi Province 710000 Patentee after: Xi'an xinshide Defense Technology Co., Ltd Address before: East Lake 562300 Guizhou Province, Qianxinan Buyei and Miao Autonomous Prefecture Xingren County Street Nga Village Industrial Park Patentee before: GUIZHOU JIANXING TECHNOLOGY Co.,Ltd. |
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