CN101447783A - Self-sustained protective circuit based on gate circuit and implementation method thereof - Google Patents
Self-sustained protective circuit based on gate circuit and implementation method thereof Download PDFInfo
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- CN101447783A CN101447783A CNA2008102043345A CN200810204334A CN101447783A CN 101447783 A CN101447783 A CN 101447783A CN A2008102043345 A CNA2008102043345 A CN A2008102043345A CN 200810204334 A CN200810204334 A CN 200810204334A CN 101447783 A CN101447783 A CN 101447783A
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Abstract
The invention provides a self-sustained protective circuit based on a gate circuit and an implementation method thereof, belonging to the field of electronic equipment. The self-sustained protective circuit only comprises a sample circuit, a logical gate circuit and a power switch; wherein, the sample circuit is used for collecting a circuit module of power output information; the logical gate circuit is provided with a schmitt trigger, is used for getting sampling voltage from the sample circuit and realizing voltage comparison, and provides the circuit module of a control signal for the power switch by logical operation; the power switch determines a power supply and a switch module being in a load conducting state according to the control signal provided by the logical gate circuit provided with the schmitt trigger. By being provided with the logical gate circuit provided with the schmitt trigger, the invention can effectively reduce necessary parts such as the comparator, the reference voltage and the like of an overcurrent and overvoltage protective circuit. Therefore, the invention saves the cost, leads the response time of the overcurrent and overvoltage protective circuit to be shorter, and ensures the energy consumption to be lower and the performance to be more stable.
Description
Technical field
The invention belongs to electronic device field.
Background technology
Various self-holding protective circuits, particularly current foldback circuit can play a protective role to entire circuit to after the bearing electric current and surpass threshold value of circuit load.
Join shown in Figure 1ly, what show here is the conventional circuit structure with current protecting function.Power supply powers to the load, and, is compared with reference voltage after current sampling circuit obtains sampled voltage by comparator again.After the sampled voltage of reality surpasses certain threshold level, send control signal through overcurrent index signal circuit to switch by comparator, thereby make switch change off-state into by closure state, realize protection operation at load and entire circuit.
This structure does not have problem, but two big shortcomings, the one, circuit complexity, the 2nd, cost height is arranged on function.Such as, this structure needs supporting use comparator and reference voltage, and is quite numerous and diverse.
Summary of the invention
The purpose of this invention is to provide a kind of self-holding protective circuit and its implementation, in order to realize the self-holding defencive function of circuit based on gate circuit.
A kind of self-holding protective circuit based on gate circuit, it realizes that so this self-holding protective circuit comprises and only comprises:
Sample circuit, it is the circuit module that is used to gather electric power outputting current or information of voltage;
The logic gates of band application schmitt trigger, it is to be used for obtaining sampled voltage and realizing voltage ratio from sample circuit, and the circuit module of control signal is provided to power switch by logical operation;
Power switch, it is the control signal that logic gates provided according to the band application schmitt trigger, determines the switch module of power supply and load conducting state.
Further, self-holding protective circuit described in the invention also includes following technical essential:
Sampling resistor in the described sample circuit, and be connected in series between the power supply, load, in order to realize current sample.
Sampling resistor in the described sample circuit, and be connected in parallel between the power supply, load, in order to realize voltage sample.
Be provided with current transformer in the described sample circuit, and be connected in series between the power supply, load, in order to realize current sample.
Described power switch is one of them among metal-oxide-semiconductor, triode, relay, controllable silicon, the IGBT.
The logic gates of described band application schmitt trigger, gate device portions wherein, adopt with door or door, NOR gate, XOR gate, with or, in the NAND gate one of them.
A kind of implementation method of the self-holding protective circuit based on gate circuit is characterized in that this method comprises the steps:
Step 2, when short circuit or overvoltage appear in load, the sampled voltage of sample circuit be in step 1 in the second threshold value space of logic gates of band application schmitt trigger;
Step 3, when the electric potential signal that is obtained by sample circuit in the last step was transferred to the logic gates of band application schmitt trigger, Schmidt trigger had carried out sluggish comparison to this electric potential signal, obtained control signal by the gate circuit logical operation;
Step 4, the comparative result in the previous step is transferred in the power switch, makes power switch change off-state into;
Step 5, after power switch was in off-state, the sampled voltage of sample circuit was in the potential state the same with step 1, and the logic gates of band application schmitt trigger is controlled oneself, and power switch keeps off-state.
Further, described method also comprises following technical characterictic:
Its sample mode adopts one or more among the following three in the described sample circuit,
A is connected in series between sampling resistor wherein and power supply, the load, in order to the realization current sample,
B is connected in parallel between sampling resistor wherein and power supply, the load, in order to the realization voltage sample,
C is provided with current transformer in described sample circuit, and is connected in series between the power supply, load, in order to realize current sample.
Described power switch is one of them among metal-oxide-semiconductor, triode, relay, controllable silicon, the IGBT.
The logic gates of described band application schmitt trigger, gate device portions wherein, adopt with door or door, NOR gate, XOR gate, with or, in the NAND gate one of them.
The invention has the advantages that: by the logic gates of band application schmitt trigger is set in the present invention; can reduce the indispensable parts of conventional overcurrents such as comparator and reference voltage, overvoltage crowbar effectively; when saving cost; also make the response time of overcurrent, overvoltage crowbar shorter, power consumption is lower, performance is more stable.
Description of drawings
The present invention will be described in more detail below in conjunction with accompanying drawing.
Fig. 1 is the circuit diagram of current existing self-holding property current protecting circuit.
Fig. 2 is the circuit diagram of a kind of self-holding protective circuit based on gate circuit of the present invention.
Fig. 3 is that the logic gates of the band application schmitt trigger among the present invention is carried out sluggish schematic diagram relatively.
Fig. 4 is the circuit diagram of the described a kind of self-holding protective circuit based on gate circuit among the present invention, is another embodiment.
Fig. 5 is the flow chart of implementation method of the circuit diagram of the described a kind of self-holding protective circuit based on gate circuit among the present invention.
Embodiment
Number designation explanation among the figure:
The 100-protective circuit of controlling oneself; The 200-power supply; The 300-power switch; The 400-load; The 500-sample circuit; The logic gates of 600-band application schmitt trigger.
Self-holding protective circuit and its implementation of logic gates based on the band application schmitt trigger provided by the present invention; it can be than current existing technical scheme; more simple, cost is realized the self-holding defencive function of circuit more cheaply, and application prospect is boundless.
Shown in ginseng accompanying drawing 2 or the accompanying drawing 4, the self-holding protective circuit based on the logic gates of band application schmitt trigger described in the present invention abbreviates the protective circuit 100 of controlling oneself in the present invention as.The protective circuit 100 of should controlling oneself comprises and " only comprising ":
The logic gates 600 of band application schmitt trigger, it is to be used for obtaining sampled voltage and realizing voltage ratio from sample circuit 500, and the circuit module of control signal is provided to power switch by logical operation;
Core of the present invention just was on aforesaid " only comprising ".We have realized the self-holding defencive function of circuit by structure innovation with element still less.Our this new construction as product in the past, must not be provided with comparator, and the reference voltage that matches with comparator.
In this invention; the logic gates 600 of band application schmitt trigger directly obtains power source voltage information from sample circuit 500; then; control signal after the computing is transferred in the power switch 300; thereby the closure and the off-state of decision power switch 300; and can keep state after the change, realize the self-holding defencive function of circuit.
Generally speaking, this self-holding protective circuit 100 also includes following technical essential:
The sample circuit that is provided with in the described sample circuit 500, and can be connected in series between the power supply 200, load 400, in order to realize current sample.Set sample circuit 500 in Fig. 2, its sampling resistor is provided with by this structure.
Sampling resistor in the described sample circuit 500, and be connected in parallel between the power supply 200, load 400, in order to realize voltage sample.Set sample circuit 500 in Fig. 4, its sampling resistor is provided with by this structure.
In addition, in described sample circuit 500, current transformer can also be set, be connected in series between this circuit instrument transformer and power supply 200, the load 400,, thereby realize current sample by the mutual inductance principle acquisition current sample of electric current.
Foregoing power switch 300, the control signal that is produced in order to the logic gates 600 of receiving belt Schmidt trigger realizes turn-off function, its concrete structure does not limit.As typical embodiment, can adopt in metal-oxide-semiconductor, triode, relay, the controllable silicon one of them to realize.In addition,, also have other factors to take into account usually, mainly also comprise and promptly can bear voltage peak by withstand voltage properties according to the difference of application scenario, and the response time etc.; And when specifically implementing, when fully taking into account performance, alternative costs power switch 300 more suitably again.
The logic gates 600 of foregoing band application schmitt trigger as long as can carry out logical operation to the sampled result of sample circuit 500, and can come the control signal of sending power controlling switch 300 just passable, and concrete structure does not limit.And gate device portions wherein just has abundant selection, such as, adopt with door or door, NOR gate, XOR gate, with or, in the NAND gate one of them, all be fine; During concrete enforcement, it is just passable to do selection according to the circuit conditions of using.
The overcurrent of foregoing logic gates based on the band application schmitt trigger protective circuit 100 of controlling oneself also has supporting implementation method, utilizes this method, and its self-holding defencive function just can obtain good realization.This method comprises the steps:
That is to say that at first, entire circuit all is closed, power switch 300 is conductings.
As an example, can be with reference to Fig. 3, this moment the band application schmitt trigger the sampled voltage that obtained of logic gates 600, be between 0～2 volt; This interval also is the first threshold space of the logic gates 600 of band application schmitt trigger.
Step 2, when short circuit appears in load 400, the sampled voltage of sample circuit be in step 1 in the second threshold value space of logic gates 600 of band application schmitt trigger.
As an example, with reference to shown in Figure 3, this moment the band application schmitt trigger the sampled voltage that obtained of logic gates 600, be in voltage threshold interval greater than 2 volts; Perhaps, voltage drops between 1～2 volt, and the logic gates 600 of band application schmitt trigger has self-holding function; This interval is the second threshold value space of the logic gates 600 of band application schmitt trigger.
The first threshold space of the logic gates 600 of band application schmitt trigger and the second threshold value space are in both one of high potential state or low-potential state respectively.
Step 3, when the electric potential signal that is obtained by sample circuit 500 in the last step was transferred to the logic gates 600 of band application schmitt trigger, Schmidt trigger had carried out sluggish comparison to this electric potential signal, obtained control signal by the gate circuit logical operation.
Step 4, the comparative result in the previous step is transferred in the power switch 300, makes power switch 300 change off-state into.
Step 5, after power switch was in off-state, the sampled voltage of sample circuit was in the potential state the same with step 1, and the logic gates of band application schmitt trigger is controlled oneself, and power switch keeps off-state.
Such as, ginseng Fig. 2 and shown in Figure 3, when the logic gates 600 of band application schmitt trigger was in 0～2 volt first threshold space, the control signal that the logic gates 600 of band application schmitt trigger is sent made power switch 300 be in conducting state; When the voltage signal that is received when the logic gates 600 of band application schmitt trigger was in aforesaid second threshold interval, the control signal that the logic gates 600 of band application schmitt trigger is sent made power switch 300 continue to be in off-state.And after the circuit disconnection, not having current flowing, voltage is back to low-potential state, keeps controlling oneself.
In described method, its sample mode in the sample circuit, consistent with aforesaid mode.
In described method, power switch 300, as previously mentioned, one of them in employing metal-oxide-semiconductor, triode, relay, the controllable silicon gets final product.
In described method, the logic gates of band application schmitt trigger, gate device portions wherein, adopt with door or door, NOR gate, XOR gate, with or, in the NAND gate one of them.
More than be the description of this invention and unrestricted, based on other embodiment of inventive concept, also all among protection scope of the present invention.
Claims (10)
1. self-holding protective circuit based on gate circuit is characterized in that this circuit includes:
Sample circuit, it is the circuit module that is used to gather electric power outputting current or voltage;
The logic gates of band application schmitt trigger, it is to be used for obtaining sampled voltage and realizing voltage ratio from sample circuit, and the circuit module of control signal is provided to power switch by logical operation;
Power switch, it is the control signal that logic gates provided according to the band application schmitt trigger, determines the switch module of power supply and load conducting state.
2. the self-holding protective circuit based on gate circuit according to claim 1 is characterized in that: the sampling resistor in the described sample circuit, and be connected in series between the power supply, load, in order to realize current sample.
3. the self-holding protective circuit based on gate circuit according to claim 1 is characterized in that: the sampling resistor in the described sample circuit, and be connected in parallel between the power supply, load, in order to realize voltage sample.
4. the self-holding protective circuit based on gate circuit according to claim 1 is characterized in that: be provided with current transformer in the described sample circuit, and be connected in series between the power supply, load, in order to realize current sample.
5. the self-holding protective circuit based on gate circuit according to claim 1 is characterized in that: described power switch is one of them among metal-oxide-semiconductor, triode, relay, controllable silicon, the IGBT.
6. the self-holding protective circuit based on gate circuit according to claim 1; it is characterized in that: the logic gates of described band application schmitt trigger; gate device portions wherein, adopt with door or door, NOR gate, XOR gate, with or, in the NAND gate one of them.
7. the implementation method based on the self-holding protective circuit of gate circuit is characterized in that this method comprises the steps:
Step 1, starting stage closing of circuit, the sampled voltage of sample circuit are in the first threshold space of the logic gates of band application schmitt trigger;
Step 2, when short circuit or overvoltage appear in load, the sampled voltage of sample circuit be in step 1 in the second threshold value space of logic gates of band application schmitt trigger;
Step 3, when the electric potential signal that is obtained by sample circuit in the last step was transferred to the logic gates of band application schmitt trigger, Schmidt trigger had carried out sluggish comparison to this electric potential signal, obtained control signal by the gate circuit logical operation;
Step 4, the comparative result in the previous step is transferred in the power switch, makes power switch change off-state into;
Step 5, after power switch was in off-state, the sampled voltage of sample circuit was in the potential state the same with step 1, and the logic gates of band application schmitt trigger is controlled oneself, and power switch keeps off-state.
8. the implementation method of the self-holding protective circuit based on gate circuit according to claim 7, it is characterized in that: its sample mode adopts one or more among the following three in the described sample circuit,
A is connected in series between sampling resistor wherein and power supply, the load, in order to the realization current sample,
B is connected in parallel between sampling resistor wherein and power supply, the load, in order to the realization voltage sample,
C is provided with current transformer in described sample circuit, and is connected in series between the power supply, load, in order to realize current sample.
9. the implementation method of the self-holding protective circuit based on gate circuit according to claim 7, it is characterized in that: described power switch is one of them among metal-oxide-semiconductor, triode, relay, controllable silicon, the IGBT.
10. the implementation method of the self-holding protective circuit based on gate circuit according to claim 7; it is characterized in that: the logic gates of described band application schmitt trigger; gate device portions wherein, adopt with door or door, NOR gate, XOR gate, with or, in the NAND gate one of them.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102043345A CN101447783A (en) | 2008-12-10 | 2008-12-10 | Self-sustained protective circuit based on gate circuit and implementation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102043345A CN101447783A (en) | 2008-12-10 | 2008-12-10 | Self-sustained protective circuit based on gate circuit and implementation method thereof |
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| CN101447783A true CN101447783A (en) | 2009-06-03 |
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| CNA2008102043345A Pending CN101447783A (en) | 2008-12-10 | 2008-12-10 | Self-sustained protective circuit based on gate circuit and implementation method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101820162A (en) * | 2010-05-18 | 2010-09-01 | 北京星网锐捷网络技术有限公司 | Overcurrent protector |
| CN103390877A (en) * | 2013-08-07 | 2013-11-13 | 北京经纬恒润科技有限公司 | Overcurrent detection and protection circuit |
| CN104765301A (en) * | 2015-03-10 | 2015-07-08 | 国核自仪系统工程有限公司 | Switching value output self-protection circuit |
| CN104808514A (en) * | 2014-01-23 | 2015-07-29 | 北京北方微电子基地设备工艺研究中心有限责任公司 | Relay interlocking plate |
| CN105652947A (en) * | 2016-03-30 | 2016-06-08 | 无锡智卓电气有限公司 | Energy-saving control circuit of electric operating mechanism of circuit breaker |
| CN106026011A (en) * | 2016-07-25 | 2016-10-12 | 贝兹维仪器(苏州)有限公司 | Overcurrent protection device for underground petroleum logging instrument |
| CN106159877A (en) * | 2016-07-25 | 2016-11-23 | 贝兹维仪器(苏州)有限公司 | A kind of connector for logging while drilling circuit protection device |
| CN109861327A (en) * | 2019-01-31 | 2019-06-07 | 北京汇能精电科技股份有限公司 | Power-supply system power supply output port isolating device |
-
2008
- 2008-12-10 CN CNA2008102043345A patent/CN101447783A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101820162A (en) * | 2010-05-18 | 2010-09-01 | 北京星网锐捷网络技术有限公司 | Overcurrent protector |
| CN101820162B (en) * | 2010-05-18 | 2012-12-12 | 北京星网锐捷网络技术有限公司 | Overcurrent protector |
| CN103390877A (en) * | 2013-08-07 | 2013-11-13 | 北京经纬恒润科技有限公司 | Overcurrent detection and protection circuit |
| CN104808514A (en) * | 2014-01-23 | 2015-07-29 | 北京北方微电子基地设备工艺研究中心有限责任公司 | Relay interlocking plate |
| CN104808514B (en) * | 2014-01-23 | 2018-11-06 | 北京北方华创微电子装备有限公司 | Relay interlock board |
| CN104765301A (en) * | 2015-03-10 | 2015-07-08 | 国核自仪系统工程有限公司 | Switching value output self-protection circuit |
| CN105652947A (en) * | 2016-03-30 | 2016-06-08 | 无锡智卓电气有限公司 | Energy-saving control circuit of electric operating mechanism of circuit breaker |
| CN106026011A (en) * | 2016-07-25 | 2016-10-12 | 贝兹维仪器(苏州)有限公司 | Overcurrent protection device for underground petroleum logging instrument |
| CN106159877A (en) * | 2016-07-25 | 2016-11-23 | 贝兹维仪器(苏州)有限公司 | A kind of connector for logging while drilling circuit protection device |
| CN109861327A (en) * | 2019-01-31 | 2019-06-07 | 北京汇能精电科技股份有限公司 | Power-supply system power supply output port isolating device |
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Open date: 20090603 |