CN105449633A - Over/under voltage protection system of electrical equipment - Google Patents
Over/under voltage protection system of electrical equipment Download PDFInfo
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- CN105449633A CN105449633A CN201510769730.2A CN201510769730A CN105449633A CN 105449633 A CN105449633 A CN 105449633A CN 201510769730 A CN201510769730 A CN 201510769730A CN 105449633 A CN105449633 A CN 105449633A
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Abstract
The invention discloses an over/under voltage protection system of electrical equipment. The system comprises an over/under voltage protection module, an under voltage latch module, and a relay control module. The over/under voltage protection module is used for outputting a first outage signal when the power supply voltage of the external power supply of the electrical equipment exceeds a preset voltage threshold range. The under voltage latch module is used for judging whether the under-voltage phenomenon occurs at the power-on instant of the electrical equipment or not. If the under-voltage phenomenon occurs at the power-on instant of the electrical equipment, whether the under-voltage phenomenon of the power supply occurs after a preset time period or not is judged. If the under-voltage phenomenon of the power supply occurs after the preset time period, the under voltage latch module sends out a second outage signal. The relay control module is used for switching off the input power supply of the electrical equipment according to the first outage signal or the second outage signal. When the power supply voltage is abnormal, the first outage signal is outputted to trigger the relay control module to cut off the power supply of the main circuit of the electrical equipment. Therefore, the electrical equipment is protected. By means of the under voltage latch module, the condition that the power supply is cut off by mistake during the voltage establishment process at the initial stage of the power-on step so as to cause the power fluctuation and the repeated action can be avoided. In this way, the reliable operation of the power supply is ensured.
Description
Technical field
The present invention relates to electric equipment overvoltage/undervoltage protection field, particularly relate to a kind of overvoltage/undervoltage protection system of electric equipment.
Background technology
The live and work of people be unable to do without various electric equipment.Each electric equipment has different rated voltages and the scope range of the fluctuation of voltage of permission, only electric equipment ability safe operation in the voltage allowed band of correspondence, overtension or the too low electric equipment that all can cause damage or operation irregularity, even damage user.
In order to protect electric equipment, need the very first time when the supply power voltage over range of electric equipment power input to make a response, powered-down exports.Under normal circumstances; over under-voltage protection circuit is adopted to protect electric equipment; wherein; the output signal of comparator is adopted to control PWM chip; power-supply device is quit work when output voltage is too high or too low, and the shortcoming of this input over under-voltage protection circuit to avoid the Voltage Establishment process at the initial stage of powering on, and easily makes power supply be turned off at the initial stage of powering on by mistake; there is the phenomenon of power supply perseveration, thus cause power supply unstable.
Thus, how making the overvoltage/undervoltage of electric equipment protect more safe and reliable, ensure the reliability service of power supply, thus ensure electric equipment reliability service, is the current technical issues that need to address of those skilled in the art.
Summary of the invention
The object of this invention is to provide a kind of overvoltage/undervoltage protection system of electric equipment, the overvoltage/undervoltage of electric equipment can be made to protect more safe and reliable, ensure the reliability service of power supply, thus ensure electric equipment reliability service.
For solving the problems of the technologies described above, the invention provides following technical scheme:
An overvoltage/undervoltage protection system for electric equipment, comprising:
Overvoltage/undervoltage protection module, exports the first power-off signal when the supply power voltage for the external power supply at electric equipment exceeds predetermined voltage threshold scope;
Under-voltage latch module, whether whether under-voltage for judging the powered on moment of electric equipment, if judge, the powered on moment of electric equipment is under-voltage, then judge to power after preset time period under-voltage, if it is under-voltage to power after preset time period, then send the second power-off signal;
Relay control module, for disconnecting the input power of described electric equipment according to described first power-off signal or described second power-off signal.
Preferably, described under-voltage latch module comprises:
Under-voltage latch reference voltage unit, for exporting under-voltage latch reference voltage;
Under-voltage latch comparing unit, for powered on moment voltage and the described under-voltage latch reference voltage of more described electric equipment, and export first under-voltage judgement signal, and supply power voltage after more described preset time period and described under-voltage latch reference voltage, and export the under-voltage judgement signal of secondary.
Preferably, described overvoltage/undervoltage protection module comprises:
Overvoltage/undervoltage reference cell, for exporting overvoltage/undervoltage reference voltage;
External power supply sampling unit, for sampling the supply power voltage of external power supply, and exports corresponding external power supply sampling voltage;
Overvoltage/undervoltage comparing unit, for receiving and more described overvoltage/undervoltage reference voltage and described external power supply sampling voltage, and exports the first compare result signal.
Preferably, described overvoltage/undervoltage reference cell comprises: the overvoltage reference circuit of output overvoltage reference voltage and the under-voltage reference circuit of the under-voltage reference voltage of output;
Described overvoltage/undervoltage comparing unit comprises: for the overvoltage comparator circuit of more described external power supply sampling voltage and described overvoltage reference voltage, and for the under-voltage comparator circuit of more described external power supply sampling voltage and described under-voltage reference voltage, described overvoltage comparator circuit is all connected with described relay control module with the output of described under-voltage comparator circuit.
Preferably, also comprise:
Voltage conversion circuit, for the supply power voltage of described external power supply being converted to the operating voltage of preset voltage value, being respectively described overvoltage/undervoltage protection module, under-voltage latch module and relay control module and powering.
Preferably, described voltage conversion circuit comprises:
First voltage transitions electronic circuit, for carrying out step-down and rectification to the supply power voltage of described external power supply, obtains the first predeterminated voltage V+, and described first predeterminated voltage V+ is the operating voltage of described relay control module;
Second voltage transitions electronic circuit, for carrying out current limliting, filtering and voltage stabilizing to described first predeterminated voltage V+, obtains the second predeterminated voltage V12, and described second predeterminated voltage V12 is comparator operating voltage;
Described overvoltage reference circuit, for carrying out current limliting and voltage stabilizing to described second predeterminated voltage V12, obtains described overvoltage reference voltage;
Described under-voltage reference circuit, for carrying out dividing potential drop to described overvoltage reference voltage, obtains described under-voltage reference voltage;
Described under-voltage latch reference voltage unit, for carrying out current limliting and dividing potential drop to described second predeterminated voltage V12, obtains described under-voltage latch reference voltage.
Preferably, described under-voltage latch comparing unit comprises the sampling voltage change-over circuit that powers on, and carries out current limliting and dividing potential drop for the voltage exported described under-voltage comparator circuit, obtains the corresponding sampling voltage that powers on.
Preferably, described external power supply sampling unit comprises external power supply voltage conversion circuit, for carrying out step-down, rectification, current limliting and dividing potential drop to the supply power voltage of external power supply, obtains corresponding described external power supply sampling voltage.
Preferably, described relay control module comprises:
Relay, control comparator and triode; the negative input of described control comparator connects the output of described overvoltage/undervoltage protection module; the reference voltage of the electrode input end input control comparator of described control comparator; the output of described control comparator connects the base stage of described triode; the grounded emitter of described triode; the collector electrode of described triode is connected the coil of described relay; the coil of described relay connects relay working voltage, and described relay connects the input power of described electric equipment.
Preferably, described relay control module also comprises:
Indicating circuit, described indicating circuit comprises the first light-emitting diode and the second light-emitting diode, described first light-emitting diode positive pole connects the base stage of described triode, the minus earth of described first light-emitting diode, the positive pole of described second light-emitting diode connects the collector electrode of described triode, the minus earth of described second light-emitting diode.
Compared with prior art, technique scheme has the following advantages:
The overvoltage/undervoltage protection system of a kind of electric equipment that the embodiment of the present invention provides; when the voltage of the external power supply for power electrical apparatus exceeds the voltage security scope of this electric equipment; during as external power supply generation overvoltage or under-voltage situation; overvoltage/undervoltage protection module judges that now supply power voltage is abnormal; and export the first power-off signal to relay control module; trigger relay control module cuts off the connection of external power supply and electric equipment, to protect electric equipment.Owing to being provided with under-voltage latch module, secondary judgement is carried out to piezoelectric voltage on electric equipment, it is at powered on moment that first time judges, if be judged to be under-voltage, be set to under-voltage for the first time, under-voltage not control relay control module is cut off the electricity supply for the first time, do second time through a period of time of presetting after under-voltage for the first time to judge, if second time judges to throw away into under-voltage, then send the second power-off signal, trigger relay control module is cut off the electricity supply, thus avoid at the initial stage of powering on, in Voltage Establishment process, power supply is turned off by mistake, and cause power-supply fluctuation to occur the situation of perseveration, ensure that the reliability service of power supply.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The overvoltage/undervoltage protection system structural representation of the electric equipment that Fig. 1 provides for a kind of embodiment of the present invention;
The overvoltage/undervoltage protection module structural representation that Fig. 2 provides for a kind of embodiment of the present invention;
The under-voltage latch module structural representation that Fig. 3 provides for a kind of embodiment of the present invention;
The relay control module structural representation that Fig. 4 provides for a kind of embodiment of the present invention.
Embodiment
Core of the present invention is to provide a kind of overvoltage/undervoltage protection system of electric equipment, the overvoltage/undervoltage of electric equipment can be made to protect more safe and reliable, ensures the reliability service of power supply, thus ensures electric equipment reliability service.
In order to enable above-mentioned purpose of the present invention, feature and advantage more become apparent, and are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
Set forth detail in the following description so that fully understand the present invention.But the present invention can be different from alternate manner described here to implement with multiple, those skilled in the art can when without prejudice to doing similar popularization when intension of the present invention.Therefore the present invention is not by the restriction of following public embodiment.
Please refer to Fig. 1, the overvoltage/undervoltage protection system structural representation of the electric equipment that Fig. 1 provides for a kind of embodiment of the present invention.
A kind of embodiment of the present invention provides a kind of overvoltage/undervoltage protection system of electric equipment, comprising: overvoltage/undervoltage protection module 1, exports the first power-off signal when the supply power voltage for the external power supply at electric equipment exceeds predetermined voltage threshold scope; Under-voltage latch module 2, whether whether under-voltage for judging the powered on moment of electric equipment, if judge, the powered on moment of electric equipment is under-voltage, then judge to power after preset time period under-voltage, if it is under-voltage to power after preset time period, then send the second power-off signal; Relay control module 3, for disconnecting the input power of electric equipment according to the first power-off signal or the second power-off signal.
It should be noted that, so-calledly judge that whether under-voltage the referring to of the powered on moment of electric equipment judges that electric equipment is powering on the moment, namely the moment of external power supply connected by electric equipment, and whether external power supply is under-voltage; And judge to power after preset time period and whether under-voltagely refer to after a period of time that powers on, judge whether under-voltage external power supply powers.
Please refer to Fig. 2, the overvoltage/undervoltage protection module structural representation that Fig. 2 provides for a kind of embodiment of the present invention.
In one embodiment of the invention, under-voltage protective module comprises: overvoltage/undervoltage reference cell, for exporting overvoltage/undervoltage reference voltage; External power supply sampling unit, for sampling the supply power voltage of external power supply, and exports corresponding external power supply sampling voltage; Overvoltage/undervoltage comparing unit, for receiving and comparing overvoltage/undervoltage reference voltage and external power supply sampling voltage, and exports the first compare result signal.Wherein overvoltage/undervoltage reference cell comprises: the overvoltage reference circuit of output overvoltage reference voltage and the under-voltage reference circuit of the under-voltage reference voltage of output; Overvoltage/undervoltage comparing unit comprises: for comparing the overvoltage comparator circuit of external power supply sampling voltage and overvoltage reference voltage, and for comparing the under-voltage comparator circuit of external power supply sampling voltage and under-voltage reference voltage, overvoltage comparator circuit is all connected with relay control module with the output of under-voltage comparator circuit.
Present embodiment is described for a concrete overvoltage/undervoltage protection module, and as shown in Figure 2, overvoltage comparator circuit comprises a positive phase comparator 11, and the positive phase comparator U1C namely in Fig. 2, positive phase comparator 11 detects for power supply overvoltage.Under-voltage comparator circuit comprises an anti-phase comparator 12, and the anti-phase comparator U1B namely in Fig. 2, anti-phase comparator 12 detects for line under-voltage.Wherein, the positive input terminal input external power supply sampling voltage of positive phase comparator 11, negative input end input overvoltage reference voltage, output connects relay control module, for to external power supply sampling voltage and overvoltage reference voltage relatively after, the output overvoltage respective signal when detecting external power supply overvoltage, cuts off the electricity supply with trigger relay control module.The positive input terminal input undervoltage reference voltage of anti-phase comparator 12, negative input end input external power supply sampling voltage, output connects relay control module, for to external power supply sampling voltage and under-voltage reference voltage relatively after, export under-voltage respective signal when detecting that external power supply is under-voltage, cut off the electricity supply with trigger relay control module.
In the present embodiment, adopt under-voltage reference circuit to carry out dividing potential drop to overvoltage reference voltage and obtain under-voltage reference voltage, as shown in Figure 2, by series connection the first resistance R16 and the second resistance R18 dividing potential drop is carried out to overvoltage reference voltage, the voltage that the under-voltage reference voltage obtained is got for the second resistance R18.
It should be noted that, under-voltage respective signal corresponding when namely the first compare result signal detects that external power supply is under-voltage, or overvoltage respective signal corresponding when external power supply overvoltage being detected, or the normal corresponding voltage normal signal of external power supply.
It should be noted that; in the present embodiment; if the electric voltage exception situations such as under-voltage or overvoltage that there occurs due to external power supply have caused relay control module to be cut off external power supply is to the power supply of electric equipment; if after the voltage resume of external power supply is normal; under-voltage protective module can send corresponding voltage normal signal; trigger relay control module connects the main circuit of electric equipment, namely recovers external power supply to the power supply of electric equipment.
Please refer to Fig. 3, the under-voltage latch module structural representation that Fig. 3 provides for a kind of embodiment of the present invention.
In the present embodiment, under-voltage latch module 2 comprises: under-voltage latch reference voltage unit 21, for exporting under-voltage latch reference voltage, as judging the foundation whether upper piezoelectric voltage is under-voltage in the initial voltage process of establishing that powers on, under-voltage latch comparing unit 22, for comparing the powered on moment voltage of electric equipment and under-voltage latch reference voltage, and export first under-voltage judgement signal, as judged, powered on moment voltage is less than under-voltage latch reference voltage, then under-voltage latch comparing unit exports a first under-voltage judgement signal, this judgement signal indication is under-voltage for the first time, but now do not make any operation, namely relay control module does not cut off the main circuit power of electric equipment, compare the supply power voltage after preset time period and under-voltage latch reference voltage afterwards, and export the under-voltage judgement signal of secondary, namely secondary analysis is carried out to upper piezoelectric voltage, as after judging under-voltage 20 seconds for the first time, if piezoelectric voltage and supply power voltage are still under-voltage in judgement, then send another under-voltage judgement signal, now, this is under-voltage, and judgement signal meeting trigger relay control module cuts off the main circuit power of electric equipment, namely the power supply of external power supply to electric equipment is cut off.Wherein, under-voltage latch module to the algorithm of supply power voltage secondary analysis is: u
1(s)=0.5u (s)+0.5u (s) e
-2T/RC, wherein, R=100K Ω, C=100 μ F, gives u
1(s) and the certain preset value of u (s), can draw time T, wherein T is that under-voltage latch module is carried out in secondary analysis process to supply power voltage, judge first time under-voltage and second time under-voltage between the time threshold preset.
Present embodiment is described for a concrete under-voltage latch module, and as shown in Figure 3, under-voltage latch comparing unit comprises under-voltage latched comparator U1A and diode D7, and wherein under-voltage latched comparator U1A adopts positive phase comparator.In the present embodiment, under-voltage latch comparing unit also comprises the sampling voltage change-over circuit that powers on, voltage for exporting under-voltage comparator circuit carries out current limliting and dividing potential drop, obtain the corresponding sampling voltage that powers on, learn whether undervoltage warning does second time in a period of time of presetting and judge by comparing, thus the process avoiding powered on moment Voltage Establishment turns off main circuit power by mistake.And this sampling voltage that powers on is input to the positive input terminal of under-voltage latched comparator U1A, the negative input end then input undervoltage latch reference voltage of under-voltage latched comparator U1A, wherein, the sampling voltage that powers on change-over circuit comprises resistance R5, resistance R6, resistance R12, resistance R8 and capacitor C4.Wherein, one end of resistance R5 connects under-voltage comparator circuit output end, the other end contact resistance R6 first end of resistance R5, the first end of resistance R6 second end contact resistance R12, the second end ground connection of resistance R12, the first end of resistance R6 also connects one end of electric capacity C4, the other end ground connection of electric capacity C4, the first end of the first end contact resistance R8 of resistance R12, second end of resistance R8 connects the output of under-voltage latched comparator U1A, the output of under-voltage latched comparator U1A connects the positive pole of diode D7, and the negative pole of diode D7 connects under-voltage comparator circuit output end.In the under-voltage latch module of present embodiment, the sampling voltage that will power on and under-voltage latch reference voltage compare, and comparative result is sent to diode D7, by controlling break-make and then the control relay control module of diode D7.
In one embodiment of the present invention; overvoltage/undervoltage protection system; also comprise: voltage conversion circuit, for the supply power voltage of external power supply being converted to the operating voltage of preset voltage value, being respectively overvoltage/undervoltage protection module, under-voltage latch module and relay control module and powering.
It should be noted that; in the present embodiment; when relay control module cuts off the main circuit of electric equipment; when namely cutting off the supply power voltage of electric equipment; the power supply of external power supply to overvoltage/undervoltage protection module, under-voltage latch module and relay control module can't be cut off; even if external power supply voltage occurs abnormal like this; overvoltage/undervoltage protection module, under-voltage latch module and relay control module be normal work still; when external power supply voltage resume is normal, relay control module can reclose external power supply and electric equipment.
In one embodiment of the invention, voltage conversion circuit comprises: the first voltage transitions electronic circuit, for carrying out step-down and rectification to the supply power voltage of external power supply, obtain the first predeterminated voltage V+, the first predeterminated voltage V+ is the operating voltage of relay control module; Second voltage transitions electronic circuit, for carrying out current limliting, filtering and voltage stabilizing to the first predeterminated voltage V+, obtain the second predeterminated voltage V12, the second predeterminated voltage V12 is comparator operating voltage, and comparator herein comprises all comparators in overvoltage/undervoltage protection system; Overvoltage reference circuit, for carrying out current limliting and voltage stabilizing to the second predeterminated voltage V12, obtains overvoltage reference voltage; Under-voltage reference circuit, for carrying out dividing potential drop to overvoltage reference voltage, obtains under-voltage reference voltage; Under-voltage latch reference voltage unit, for carrying out current limliting and dividing potential drop to the second predeterminated voltage V12, obtains under-voltage latch reference voltage.
Further, external power supply sampling unit comprises external power supply voltage conversion circuit, for carrying out step-down, rectification, current limliting and dividing potential drop to the supply power voltage of external power supply, obtains corresponding external power supply sampling voltage.
Please refer to Fig. 4, the relay control module structural representation that Fig. 4 provides for a kind of embodiment of the present invention.
In one embodiment of the invention, relay control module comprises: relay, control comparator U1D and triode Q1, the negative input controlling comparator U1D connects the output (namely in Fig. 4, overvoltage/undervoltage compares output) of overvoltage/undervoltage protection module, control the reference voltage of the electrode input end input control comparator of comparator U1D, in the present embodiment, control the reference voltage of comparator by gained after the second predeterminated voltage V12 dividing potential drop, as shown in Figure 4, adopt resistance R25 and resistance R26 to the second predeterminated voltage V12 dividing potential drop, the reference voltage controlling comparator is resistance R26 partial pressure value, control the base stage of the output connecting triode Q1 of comparator U1D, the grounded emitter of triode Q1, the coil D2 of the collector electrode series relay of triode Q1, the coil D2 of relay connects relay working voltage, relay connects the input power of electric equipment.Wherein, according to the open and close of the signal control relay that the base stage of triode Q1 receives, the corresponding electric shock of relay connects the main circuit of electric equipment, to control the on/off of main circuit.Wherein, no matter overvoltage/undervoltage protection module detects that now voltage is overvoltage or under-voltage; overvoltage/undervoltage protection module output all exports high level; namely the voltage that the negative input end (13 pin) controlling comparator U1D inputs is high level; the reference voltage now controlling the voltage ratio positive input terminal (12 pin) of comparator U1D negative input end is large; then its output (14 pin) output low level; because triode Q1 is NPN type triode; the triode Q1 only just conducting when base stage is high level; so now Q1 disconnects relay, namely cut off the power supply of main circuit.
Wherein, at the initial stage of powering on, the negative pole of the diode D7 in the under-voltage latch module in Fig. 3 connects the output of described overvoltage/undervoltage protection module, is namely connected with the input of relay control module.When the non-conducting of diode D7, control comparator U1D and export high level, now triode Q1 conducting, relay closes, thus main circuit normally works.When diode D7 conducting, control comparator U1D output low level, now triode Q1 disconnects, and relay disconnects, thus main circuit quits work.
Further, relay control module also comprises: indicating circuit, indicating circuit comprises the first light-emitting diode and the second light-emitting diode, the base stage of the first light-emitting diode positive pole connecting triode, the minus earth of the first light-emitting diode, the collector electrode of the positive pole connecting triode of the second light-emitting diode, the minus earth of the second light-emitting diode.Preferably the first light-emitting diode is green LED in the present embodiment, and the second light-emitting diode is red light emitting diodes, and when the voltage of external power supply is normal, green LED is bright, otherwise red light emitting diodes is bright.
In sum; the overvoltage/undervoltage protection system of a kind of electric equipment that the embodiment of the present invention provides; when the voltage of the external power supply for power electrical apparatus exceeds the voltage security scope of this electric equipment; during as external power supply generation overvoltage or under-voltage situation; overvoltage/undervoltage protection module judges that now supply power voltage is abnormal; and exporting the first power-off signal to relay control module, trigger relay control module cuts off the connection of external power supply and electric equipment, to protect electric equipment.Owing to being provided with under-voltage latch module, secondary judgement is carried out to piezoelectric voltage on electric equipment, it is at powered on moment that first time judges, if be judged to be under-voltage, be set to under-voltage for the first time, under-voltage not control relay control module is cut off the electricity supply for the first time, do second time through a period of time of presetting after under-voltage for the first time to judge, if second time judges to throw away into under-voltage, then send the second power-off signal, trigger relay control module is cut off the electricity supply, thus avoid at the initial stage of powering on, in Voltage Establishment process, power supply is turned off by mistake, and cause power-supply fluctuation to occur the situation of perseveration, ensure that the reliability service of power supply.
Above the overvoltage/undervoltage protection system of a kind of electric equipment provided by the present invention is described in detail.Apply specific case herein to set forth principle of the present invention and execution mode, the explanation of above embodiment just understands the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection range of the claims in the present invention.
Claims (10)
1. an overvoltage/undervoltage protection system for electric equipment, is characterized in that, comprising:
Overvoltage/undervoltage protection module, exports the first power-off signal when the supply power voltage for the external power supply at electric equipment exceeds predetermined voltage threshold scope;
Under-voltage latch module, whether whether under-voltage for judging the powered on moment of electric equipment, if judge, the powered on moment of electric equipment is under-voltage, then judge to power after preset time period under-voltage, if it is under-voltage to power after preset time period, then send the second power-off signal;
Relay control module, for disconnecting the input power of described electric equipment according to described first power-off signal or described second power-off signal.
2. overvoltage/undervoltage protection system according to claim 1, is characterized in that, described under-voltage latch module comprises:
Under-voltage latch reference voltage unit, for exporting under-voltage latch reference voltage;
Under-voltage latch comparing unit, for powered on moment voltage and the described under-voltage latch reference voltage of more described electric equipment, and export first under-voltage judgement signal, and supply power voltage after more described preset time period and described under-voltage latch reference voltage, and export the under-voltage judgement signal of secondary.
3. overvoltage/undervoltage protection system according to claim 2, is characterized in that, described overvoltage/undervoltage protection module comprises:
Overvoltage/undervoltage reference cell, for exporting overvoltage/undervoltage reference voltage;
External power supply sampling unit, for sampling the supply power voltage of external power supply, and exports corresponding external power supply sampling voltage;
Overvoltage/undervoltage comparing unit, for receiving and more described overvoltage/undervoltage reference voltage and described external power supply sampling voltage, and exports the first compare result signal.
4. overvoltage/undervoltage protection system according to claim 3, is characterized in that, described overvoltage/undervoltage reference cell comprises: the overvoltage reference circuit of output overvoltage reference voltage and the under-voltage reference circuit of the under-voltage reference voltage of output;
Described overvoltage/undervoltage comparing unit comprises: for the overvoltage comparator circuit of more described external power supply sampling voltage and described overvoltage reference voltage, and for the under-voltage comparator circuit of more described external power supply sampling voltage and described under-voltage reference voltage, described overvoltage comparator circuit is all connected with described relay control module with the output of described under-voltage comparator circuit.
5. overvoltage/undervoltage protection system according to claim 4, is characterized in that, also comprise:
Voltage conversion circuit, for the supply power voltage of described external power supply being converted to the operating voltage of preset voltage value, being respectively described overvoltage/undervoltage protection module, under-voltage latch module and relay control module and powering.
6. overvoltage/undervoltage protection system according to claim 5, is characterized in that, described voltage conversion circuit comprises:
First voltage transitions electronic circuit, for carrying out step-down and rectification to the supply power voltage of described external power supply, obtains the first predeterminated voltage V+, and described first predeterminated voltage V+ is the operating voltage of described relay control module;
Second voltage transitions electronic circuit, for carrying out current limliting, filtering and voltage stabilizing to described first predeterminated voltage V+, obtains the second predeterminated voltage V12, and described second predeterminated voltage V12 is comparator operating voltage;
Described overvoltage reference circuit, for carrying out current limliting and voltage stabilizing to described second predeterminated voltage V12, obtains described overvoltage reference voltage;
Described under-voltage reference circuit, for carrying out dividing potential drop to described overvoltage reference voltage, obtains described under-voltage reference voltage;
Described under-voltage latch reference voltage unit, for carrying out current limliting and dividing potential drop to described second predeterminated voltage V12, obtains described under-voltage latch reference voltage.
7. overvoltage/undervoltage protection system according to claim 6; it is characterized in that; described under-voltage latch comparing unit comprises the sampling voltage change-over circuit that powers on, and carries out current limliting and dividing potential drop for the voltage exported described under-voltage comparator circuit, obtains the corresponding sampling voltage that powers on.
8. overvoltage/undervoltage protection system according to claim 7; it is characterized in that; described external power supply sampling unit comprises external power supply voltage conversion circuit, for carrying out step-down, rectification, current limliting and dividing potential drop to the supply power voltage of external power supply, obtains corresponding described external power supply sampling voltage.
9. according to the overvoltage/undervoltage protection system described in claim 1 to 8, it is characterized in that, described relay control module comprises:
Relay, control comparator and triode; the negative input of described control comparator connects the output of described overvoltage/undervoltage protection module; the reference voltage of the electrode input end input control comparator of described control comparator; the output of described control comparator connects the base stage of described triode; the grounded emitter of described triode; the collector electrode of described triode is connected the coil of described relay; the coil of described relay connects relay working voltage, and described relay connects the input power of described electric equipment.
10. overvoltage/undervoltage protection system according to claim 9, is characterized in that, described relay control module also comprises:
Indicating circuit, described indicating circuit comprises the first light-emitting diode and the second light-emitting diode, described first light-emitting diode positive pole connects the base stage of described triode, the minus earth of described first light-emitting diode, the positive pole of described second light-emitting diode connects the collector electrode of described triode, the minus earth of described second light-emitting diode.
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| CN107947121A (en) * | 2017-12-12 | 2018-04-20 | 成都爱特联科技有限公司 | A kind of Switching Power Supply with over-and under-voltage defencive function |
| CN108155622A (en) * | 2018-01-24 | 2018-06-12 | 宁波大家小家网络科技有限公司 | A kind of overvoltage/undervoltage protective device for electric system |
| CN109861379A (en) * | 2019-02-27 | 2019-06-07 | 深圳市汇川技术股份有限公司 | Under-voltage detection method, circuit, equipment and computer readable storage medium |
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| CN112332365A (en) * | 2020-09-18 | 2021-02-05 | 深圳市海洋王照明工程有限公司 | Power supply high-voltage protection circuit and driving power supply |
| CN112332365B (en) * | 2020-09-18 | 2023-10-10 | 深圳市海洋王照明工程有限公司 | Power supply high-voltage protection circuit and driving power supply |
| CN112666470A (en) * | 2020-12-15 | 2021-04-16 | 武汉极目智能技术有限公司 | Method and device for judging whether power supply voltage of automobile electronic circuit system is undervoltage |
| CN112946347A (en) * | 2021-01-27 | 2021-06-11 | 许继集团有限公司 | Power supply over-voltage and under-voltage alarm monitoring system |
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