CN103490376A - Over-voltage and under-voltage protection device for single-phase source system - Google Patents
Over-voltage and under-voltage protection device for single-phase source system Download PDFInfo
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Abstract
The invention discloses an over-voltage and under-voltage protection device for a single-phase source system. The over-voltage and under-voltage protection device for the single-phase source system comprises a direct-current power unit, a rectifying unit, a sampling unit, an over-voltage judgment delay unit, an under-voltage judgment delay unit and a breaker triggering unit. The over-voltage judgment delay unit is a first voltage detection chip with delay. The under-voltage judgment delay unit comprises a voltage detection chip without delay, an RC charging circuit with a controllable switch and a second voltage detection chip with delay. According to the over-voltage and under-voltage protection device for the single-phase source system, the three voltage detection chips are used for achieving over-voltage and under-voltage judgment delay, and therefore the cost of the over-voltage and under-voltage protection device can be saved.
Description
Technical field
The present invention relates to distribution system for electrical domain, particularly a kind of protective device of the over-and under-voltage for the single phase poaer supply system.
Background technology
In the practical application of industry and family expenses, the single phase poaer supply system is subject to the impact of extraneous factor and overvoltage or under-voltage problem occur, and the appearance of overvoltage or undervoltage condition may cause certain damage to load, and causes certain economic loss.Therefore need to overvoltage occur or when under-voltage in the single phase poaer supply system, the path that utilizes circuit breaker etc. to cut off the single phase poaer supply system, to be protected circuit.
Fig. 1 shows the universal architecture schematic diagram of the over-and under-voltage protective device of three-phase power supply system.As shown in Figure 1, this system mainly comprises: DC power source unit 10, rectification unit 20, sampling unit 30, overvoltage judging unit 40, overvoltage delay unit 50, under-voltage judging unit 60, under-voltage delay unit 70 and circuit breaker trigger element 80.
Wherein, direct current (DC) power subsystem 10 is for the DC power supply of stable output.Can be specifically, after Voltage-output to the single phase poaer supply system carries out step-down and voltage stabilizing and processes, to produce the galvanic current source.Perhaps, DC power subsystem 10 also can be to the single phase poaer supply system after the Voltage-output after rectification unit 20 is processed carries out step-down and voltage stabilizing and process, and produces the galvanic current source.Perhaps, DC power subsystem 10 also can be produced by alternate manner, as battery etc.
Overvoltage delay unit 50 carries out the time delay output of the first setting-up time for the output to described overvoltage judging unit 40, when the time of described overvoltage judging unit 40 output overvoltage signals reaches described the first setting-up time, the output triggering signal, control the coil motion that described circuit breaker trigger element 80 triggers the circuit breaker in the single phase poaer supply system circuit, circuit breaker is disconnected.
Under-voltage judging unit 60 is by 10 power supplies of described DC power source unit, and compares for the sampled voltage signal by current input and a under-voltage reference signal, and during lower than under-voltage reference signal, exports under-voltage signal at the sampled voltage signal of current input.
Under-voltage delay unit 70 carries out the time delay output of the second setting-up time for the output to described under-voltage judging unit 60, when the time of the under-voltage signal of described under-voltage judging unit 60 output reaches described the second setting-up time, the output triggering signal, control the coil motion that described circuit breaker trigger element 80 triggers the circuit breaker in the single phase poaer supply system circuit, circuit breaker is disconnected.
At present, while stating in realization the over-and under-voltage protective device of single phase poaer supply system, some products mainly adopt amplifier to realize above-mentioned overvoltage judging unit 40, overvoltage delay unit 50 and circuit breaker trigger element 80.For example, adopt four amplifiers, two amplifiers realize that respectively overvoltage judging unit 40 and 60, two amplifiers of under-voltage judging unit realize that respectively the overvoltage time delay in circuit breaker trigger element 80 triggers and under-voltage time delay triggering.
In addition, those skilled in the art are still in the solution of being devoted to find other, during to the over-and under-voltage protection realizing the single phase poaer supply system, and the cost of reduce over-and under-voltage protective device.
Summary of the invention
In view of this, the present invention proposes a kind of protective device of the over-and under-voltage for the single phase poaer supply system, in order to the cost of the over-and under-voltage protective device that reduces the single phase poaer supply system.
The protective device of the over-and under-voltage for the single phase poaer supply system that the present invention proposes comprises: DC power source unit, rectification unit, sampling unit, overvoltage judgement delay unit, under-voltage judgement delay unit and circuit breaker trigger element, wherein:
DC power source unit is for providing the galvanic current source;
Described rectification unit is exported for after the Voltage-output of described single phase poaer supply system is converted to direct current by interchange;
Described sampling unit is for the Voltage-output after described rectification unit rectification is sampled, and output sampled voltage signal;
Described overvoltage judgement delay unit is the first voltage checking chip with time delay, for the sampled voltage signal that judges current input whether higher than self releasing voltage, as higher than, start the time delay of the first setting-up time, and whether the sampled voltage signal that judges current input in this first setting-up time is not less than the detection voltage of self, in this way, export triggering signal;
Described under-voltage judgement delay unit comprises: not with the voltage checking chip of time delay, with the RC charging circuit of the first gate-controlled switch with the second voltage detection chip of time delay; Described not with the voltage checking chip of time delay for the sampled voltage signal that judges current input whether higher than self releasing voltage, as higher than, export normal state signal, and, when the sampled voltage signal of current input is not less than the detection voltage of self, maintain this normal state signal; Otherwise, do not export this normal state signal; The described charging circuit of the RC with gate-controlled switch is described while with the voltage checking chip of time delay, not exporting described normal state signal, described the first gate-controlled switch is in closure state, described RC charging circuit does not charge, described while with the voltage checking chip of time delay, not exporting described normal state signal, described the first gate-controlled switch is in off-state, described RC charging circuit is charged by described DC power source unit, and exports corresponding detectable voltage signals; The described detection chip of the second voltage with time delay for the detectable voltage signals that judges current input whether higher than self releasing voltage, as higher than, start the time delay of the second setting-up time, and whether the detectable voltage signals that judges current input in this second setting-up time is not less than the detection voltage of self, in this way, export triggering signal;
Described circuit breaker trigger element 80, for when receiving the triggering signal of described overvoltage judgement delay unit or described under-voltage judgement delay unit output, makes the coil motion of the circuit breaker in described single phase poaer supply system circuit.
In an embodiment of the invention, described DC power source unit is undertaken producing after dividing potential drop and voltage stabilizing by the Voltage-output to the single phase poaer supply system.
In an embodiment of the invention, described DC power source unit comprises a threshold decision unit, for the Voltage-output to described single phase poaer supply system, judged, at described Voltage-output during lower than the low pressure threshold set, make described DC power source unit export 0 voltage or be less than the voltage of stationary value; During higher than the low pressure threshold set, make described DC power source unit stable output threshold voltage at described Voltage-output.
In an embodiment of the invention, described DC power source unit comprises: the first current-limiting resistance consisted of at least one current-limiting resistance be connected in series, the first voltage-stabiliser tube, storage capacitor and the second voltage-stabiliser tube; One end of described the first current-limiting resistance is connected with the output of rectification unit, and the other end is connected with the backward end of the first voltage-stabiliser tube; The forward end of described the first voltage-stabiliser tube is connected with an end of described storage capacitor and the backward end of described the second voltage-stabiliser tube respectively, the forward end ground connection of the other end of described storage capacitor and described the second voltage-stabiliser tube; Wherein, the output that the backward end of described the second voltage-stabiliser tube is described DC power source unit; Described the first voltage-stabiliser tube is at the voltage signal of described rectification unit output during lower than the low pressure threshold set, not conducting; At the voltage signal of described rectification unit output during higher than the low pressure threshold set, conducting.
In an embodiment of the invention, described under-voltage judgement delay unit further comprises: the first bleeder circuit, carry out after voltage division processing exporting to described not with the voltage checking chip of time delay for the sampled voltage signal to from sampling unit; Described not with the voltage checking chip of time delay the sampled voltage signal after for the dividing potential drop that judges current input whether higher than self releasing voltage, as higher than, export described normal state signal, and the sampled voltage signal after the dividing potential drop of current input maintains this normal state signal while being not less than the detection voltage of self; Otherwise, do not export described normal state signal.
In an embodiment of the invention, described sampling unit comprises: the second bleeder circuit, filter circuit and the first diode;
Described the second bleeder circuit carries out voltage division processing for the Voltage-output to the single phase poaer supply system after described rectification unit rectification, obtains the sampled voltage signal;
Described filter circuit carries out filtering for the sampled voltage signal that described bleeder circuit is obtained, by the filtered sampled voltage signal output obtained;
Described the first diode is between described bleeder circuit and described filter circuit, for preventing the reverse direction current flow of described filter circuit;
Described the first bleeder circuit comprises: the first divider resistance consisted of at least one divider resistance be connected in series and the second divider resistance consisted of the second diode be connected in series and at least one divider resistance; One end of described the first divider resistance is connected with the output of described sampling unit, and the other end is connected with an end of described the second divider resistance, the other end ground connection of described the second divider resistance; The output that the ungrounded end of described the second divider resistance is described the first bleeder circuit; Described the second diode is for compensating because of the change in pressure drop that variations in temperature causes described the first diode.
The described charging circuit of the RC with the first gate-controlled switch comprises: the first gate-controlled switch, the second current-limiting resistance, the 3rd current-limiting resistance, the first charging capacitor and the first discharge resistance;
A link of described the first gate-controlled switch is connected with the output of described DC power source unit by the second current-limiting resistance, another link ground connection, the control end of described the first gate-controlled switch is not connected with the output of the voltage checking chip of time delay with described by the 3rd current-limiting resistance; Described the first charging capacitor and the first discharge resistance are connected in parallel, and an end is connected with the output of described DC power source unit by described the second current-limiting resistance, other end ground connection.
In an embodiment of the invention, described the first gate-controlled switch is the first triode or NMOS pipe.
In an embodiment of the invention, described system further comprises: signal is isolated, is got or unit, isolated respectively and focused on a bit for the output to described overvoltage judgement delay unit and described under-voltage judgement delay unit, when therein arbitrary is output as triggering signal, triggering signal is exported to described circuit breaker trigger element.
In an embodiment of the invention, described circuit breaker trigger element comprises: the second gate-controlled switch, the 4th current-limiting resistance, the 5th current-limiting resistance, the second charging capacitor, the second discharge resistance and thyristor;
A link of described the second gate-controlled switch is connected with the output of described DC power source unit by the 4th current-limiting resistance, another link is connected with an end of the second charging capacitor, the second discharge resistance and the control end of thyristor respectively, and the control end of described the second gate-controlled switch isolates, gets with described signal by the 5th current-limiting resistance or the output of unit is connected; The other end ground connection of described the second charging capacitor and the second discharge resistance; Described thyristor for controlling the coil motion of the circuit breaker of single phase poaer supply system circuit when conducting.
In an embodiment of the invention, described the second gate-controlled switch is the second triode or NMOS pipe.
In an embodiment of the invention, described system further comprises: be connected to the zero line of described single phase poaer supply system and the piezo-resistance between live wire, for described over-and under-voltage protective device is carried out to surge protection.
From such scheme, can find out; owing to utilizing a voltage checking chip with time delay to realize the function of overvoltage judging unit and overvoltage delay unit in the embodiment of the present invention; utilize one with voltage checking chip and the voltage checking chip with time delay of time delay, not realize the function of under-voltage judging unit and under-voltage delay unit, thereby reduced the cost of the over-and under-voltage protective device of single phase poaer supply system.
Further, in the embodiment of the present invention, when making DC power source unit carry out voltage stabilizing and process the voltage signal of described rectification unit output, at the voltage signal of described rectification unit output during lower than the low pressure threshold set, export 0 voltage or be less than the voltage of stationary value; At the voltage signal of described rectification unit output during higher than the low pressure threshold set, the stable output threshold voltage.And then can make in under-voltage judgement delay unit not with the voltage checking chip U1 of time delay in the situation that during low voltage output secondary signal, because DC power source unit is now exported 0 voltage or lower than the voltage of stationary value, therefore to after the charging of the RC charging circuit in under-voltage judgement delay unit, it only can be exported 0 detectable voltage signals or, lower than the detectable voltage signals of the releasing voltage of the second voltage detection chip with time delay, make with the second voltage detection chip of time delay and do not export triggering signal.So, just can avoid following problem of the prior art: due to the mechanical property of circuit breaker itself, when the voltage of single phase poaer supply system during lower than certain value, as 50V or 40V etc., if exporting always, the over-and under-voltage system means under-voltage triggering signal, but the release of circuit breaker does not have enough energy to complete the mechanical action of dropout, be that circuit breaker can not disconnect, so just cause breaker coil to have large electric current to pass through in long-time, and then can cause coil to damage harm such as even causing fire.
In addition, for there being the situation that prevents the diode that electric current is reverse in sampling unit, by the diode that is provided for carrying out temperature-compensating at under-voltage judgement delay unit, can farthest guarantee the judgment accuracy of under-voltage judgement delay unit.
In addition, by the RC charging circuit at under-voltage judgement delay unit, filter capacitor being set, can prevent that interference signal from being disturbed the output signal with the voltage checking chip of time delay not, cause the misoperation of the first gate-controlled switch in under-voltage judgement delay unit.
In addition, by between the zero line N in described single phase poaer supply system and live wire L, piezo-resistance being set, can carry out surge protection to described over-and under-voltage protective device.
The accompanying drawing explanation
Below will the person of ordinary skill in the art is more clear that above-mentioned and other feature and advantage of the present invention by with reference to accompanying drawing, describing the preferred embodiments of the present invention in detail, in accompanying drawing:
The universal architecture schematic diagram of the over-and under-voltage protective device that Fig. 1 is the single phase poaer supply system.
The exemplary block diagram of the over-and under-voltage protective device that Fig. 2 is the single phase poaer supply system in the embodiment of the present invention.
The structural representation of the over-and under-voltage protective device that Fig. 3 is the single phase poaer supply system in one embodiment of the invention.
The structural representation of the over-and under-voltage protective device that Fig. 4 is the single phase poaer supply system in another embodiment of the present invention.
The structural representation of the over-and under-voltage protective device that Fig. 5 is the single phase poaer supply system in a correspondence example embodiment illustrated in fig. 4.
The structural representation of the over-and under-voltage protective device that Fig. 6 is the single phase poaer supply system in a correspondence example embodiment illustrated in fig. 3.
Wherein, accompanying drawing is described as follows:
The under-voltage judgement delay unit of the under-voltage delay unit 80-of the 10-DC power source unit 20-rectification unit 30-sampling unit 40-overvoltage judging unit 50-overvoltage under-voltage judging unit 70-of delay unit 60-circuit breaker trigger element 90-overvoltage judgement delay unit 100-110-signal is isolated, is got or unit
Embodiment
In the embodiment of the present invention, for the cost of the over-and under-voltage protective device that reduces the single phase poaer supply system, consider to adopt the cheap voltage checking chip with time delay to realize overvoltage/undervoltage judging unit and overvoltage/undervoltage delay unit.
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in more detail by the following examples.
Fig. 2 is for the exemplary block diagram of the over-and under-voltage protective device of single phase poaer supply system in the embodiment of the present invention.The structural representation of the over-and under-voltage protective device that Fig. 3 is the single phase poaer supply system in one embodiment of the invention.As shown in Figure 2, this system comprises: DC power source unit 10, rectification unit 20, sampling unit 30, overvoltage judgement delay unit 90, under-voltage judgement delay unit 100 and circuit breaker trigger element 80.
Wherein, DC power source unit 10 is for providing the galvanic current source.During specific implementation, DC power source unit 10 can be, after the Voltage-output to the single phase poaer supply system carries out step-down and voltage stabilizing and processes, to produce the galvanic current source.Now, DC power source unit 10 can directly be connected with the Voltage-output of single phase poaer supply system, also can with the Voltage-output of single phase poaer supply system, be connected by rectification unit 20.Perhaps, DC power source unit 10 also can be produced by alternate manner, as battery etc.
In the present embodiment, DC power source unit 10 is to be connected with rectification unit 20, after the Voltage-output after rectification unit 20 is processed is carried out to step-down and voltage stabilizing processing, produces the galvanic current source.During specific implementation, this DC power source unit 10 can have multiple internal structure.In Fig. 3, illustrated wherein a kind of.This DC power source unit 10 can comprise: by least one current-limiting resistance R1, R2 of being connected in series, the first current-limiting resistance, storage capacitor C1 and voltage-stabiliser tube Z2 that R3 forms.Wherein, one end of described the first current-limiting resistance is connected with the output of rectification unit 20, the other end is connected with the end of described storage capacitor C1 and the backward end of described voltage-stabiliser tube Z2 respectively, the forward end ground connection of the other end of described storage capacitor C1 and described voltage-stabiliser tube Z2; Wherein, the output that the backward end of described voltage-stabiliser tube Z2 is described DC power source unit 10.
Overvoltage judgement delay unit 90 is the first voltage checking chip U3 with time delay, for the sampled voltage signal that judges pin 5 current inputs whether higher than self releasing voltage, as higher than, start the time delay of the first setting-up time, and whether the sampled voltage signal that judges current input in this first setting-up time is not less than the detection voltage of self, in this way, by pin 4 output triggering signal Gate1.This triggering signal Gate1 is for example high level.Otherwise, if the sampled voltage signal of current input is lower than the detection voltage of self in this first setting-up time, pin 4 is not exported triggering signal, it is for example low level.
Wherein, with the releasing voltage of the first voltage checking chip U3 of time delay higher than its detecting unit.
Under-voltage judgement delay unit 100 comprises: not with the voltage checking chip U1 of time delay, with the RC charging circuit 101 of the first gate-controlled switch with the second voltage detection chip U2 of time delay.Wherein, not with the voltage checking chip U1 of time delay for the sampled voltage signal that judges the current input of pin two whether higher than self releasing voltage, as higher than,, by pin one output normal state signal Out, be generally high level; And, when the sampled voltage signal of current input is not less than the detection voltage of self, maintain this normal state signal Out; Otherwise this pin one is not exported this normal state signal Out, now be generally low level.With the RC charging circuit 101 of the first gate-controlled switch described while with the voltage checking chip U1 of time delay, not exporting described normal state signal, described the first gate-controlled switch is in closure state, described RC charging circuit 101 does not charge, described while with the voltage checking chip U1 of time delay, not exporting described normal state signal, described the first gate-controlled switch is in off-state, described RC charging circuit 101 is charged by described DC power source unit 10, and exports corresponding detectable voltage signals.With the second voltage detection chip U2 of time delay for the detectable voltage signals that judges pin 5 current inputs whether higher than self releasing voltage, as higher than, start the time delay of the second setting-up time, and whether the detectable voltage signals that judges current input in this second setting-up time is not less than the detection voltage of self, in this way,, by pin 4 output triggering signal Gate2, be for example high level.Otherwise, if, when in this second setting-up time, the sampled voltage signal of current input is lower than self detection voltage, pin 4 is not exported triggering signal Gate2, is for example low level.
Wherein, the releasing voltage with the voltage checking chip U1 of time delay does not detect voltage higher than it, with the releasing voltage of the second voltage detection chip U2 of time delay, higher than it, detects voltage.
Circuit breaker trigger element 80, for when receiving the triggering signal of described overvoltage judgement delay unit 90 or 100 outputs of described under-voltage judgement delay unit, makes the coil motion of the circuit breaker in described single phase poaer supply system circuit.
During specific implementation, in the embodiment of the present invention in order further to reduce the cost of over-and under-voltage protective device, the components and parts that can make overvoltage judgement delay unit 90 and under-voltage judgement delay unit 100 share in circuit breaker trigger element 80, for this reason, over-and under-voltage protective device in the embodiment of the present invention can be further as shown in Figure 3, comprise a signal isolation, get or unit 110, isolated respectively and focused on a bit for the output to described overvoltage judgement delay unit 90 and described under-voltage judgement delay unit 100, when therein arbitrary is output as triggering signal, triggering signal is exported to described circuit breaker trigger element 80.
During specific implementation, this signal isolates, gets or unit 110 can comprise two diode D7, D8.Wherein, the positive pole of a diode D7 is connected with the output of high pressure judgement delay unit 90, and the positive pole of another diode D8 is connected with the output of low pressure judgement delay unit 100; The negative pole of two diode D7, D8 link together rear as the isolation of described signal, get or the output of unit 110 is connected with the input of circuit breaker trigger element 80.
In practical application, mechanical property due to the coil (tripping coil) of some circuit breaker itself, when the voltage of single phase poaer supply system during lower than certain value, as 50V or 40V etc., although the element for under-voltage judgement, as under-voltage judgement delay unit 100, output always means under-voltage triggering signal, but the tripping coil of circuit breaker does not have enough energy to complete the mechanical action of dropout, be that circuit breaker can not disconnect, so just cause breaker coil to have large electric current to pass through in long-time, and then can cause coil to damage harm such as even causing fire.
In order to address this problem, while determining in another embodiment of the present invention that voltage in the single phase poaer supply system is lower than certain value, as 50V or 40V etc., be used in the element of under-voltage judgement, as under-voltage judgement delay unit 100, do not export and mean under-voltage triggering signal, so, in just can be for a long time in breaker coil, there do not is large electric current to pass through, avoided the harm such as coil damage and fire.
For this reason, DC power source unit 10 can comprise a threshold decision unit, for the Voltage-output of single phase poaer supply system is judged, at described Voltage-output during lower than the low pressure threshold set, make described DC power source unit 10 output 0 voltages or be less than the voltage of stationary value; During higher than the low pressure threshold set, make described DC power source unit 10 stable output threshold voltages at described Voltage-output.Wherein, this threshold decision unit can be for example that voltage stabilizing didoe or other have the device of threshold decision function.
The structural representation of the over-and under-voltage protective device that Fig. 4 is the single phase poaer supply system in another embodiment of the present invention.As shown in Figure 4, in the present embodiment, on the basis of system shown in Figure 3, when the voltage signal that makes 10 pairs of described rectification units 20 of DC power source unit export carries out the voltage stabilizing processing, at the voltage signal of described rectification unit 20 outputs during lower than the low pressure threshold set, described DC power source unit 10 output 0 voltages or be less than the voltage of stationary value; At the voltage signal of described rectification unit 20 outputs during higher than the low pressure threshold set, described DC power source unit 10 stable output threshold voltages.Like this in under-voltage judgement delay unit 100 not with the voltage checking chip U1 of time delay output secondary signal, and when described RC charging circuit 101 is charged by described DC power source unit 10, due to 10 output 0 voltages of DC power source unit now or lower than the voltage of stationary value, therefore described RC charging circuit 101 can output 0 detectable voltage signals or lower than the detectable voltage signals of the releasing voltage of the second voltage detection chip U2 with time delay, make with the second voltage detection chip of time delay and do not export triggering signal.
During specific implementation, DC power source unit 10 in the present embodiment is utilized before voltage stabilizing circuit carries out the voltage stabilizing processing at the voltage signal to rectification unit 20 output, the voltage signal to rectification unit 20 outputs is filtered as the threshold decision unit can to utilize a voltage-stabiliser tube Z1, when the voltage signal of rectification unit 20 output during lower than the low pressure threshold set, not conducting of this voltage-stabiliser tube Z1; At the voltage signal of rectification unit 20 output during higher than the low pressure threshold set, this voltage-stabiliser tube Z1 conducting.So, when the voltage of single phase poaer supply system during lower than the low pressure threshold of this setting, as 50V or 40V or 30V etc., can output 0 voltage after DC power source unit 10 voltage stabilizings or be less than the voltage of stationary value.
As shown in Figure 4, this DC power source unit 10 can specifically comprise: the first current-limiting resistance consisted of at least one current-limiting resistance R1, R2 of being connected in series, the first voltage-stabiliser tube Z1, storage capacitor C1 and the second voltage-stabiliser tube Z2.Wherein, an end of described the first current-limiting resistance is connected with the output of rectification unit 20, and the other end is connected with the backward end of the first voltage-stabiliser tube Z1; The forward end of described the first voltage-stabiliser tube Z1 is connected respectively at the end of described storage capacitor C1 and the backward end of described the second voltage-stabiliser tube Z2, the forward end ground connection of the other end of described storage capacitor C1 and described the second voltage-stabiliser tube Z2; Wherein, the output that the backward end of described the second voltage-stabiliser tube Z2 is described DC power source unit 10.
During specific implementation, the RC charging circuit 101 with the first gate-controlled switch in the embodiment of the present invention can have multiple specific implementation form.In Fig. 2 to Fig. 4, only show wherein a kind of.Specifically comprise: the first gate-controlled switch K1, the second current-limiting resistance R12, the 3rd current-limiting resistance R11, the first charging capacitor C4, the first discharge resistance R13 and filter capacitor C11.Wherein, the link of the first gate-controlled switch K1 is connected with the output of described DC power source unit 10 by the second current-limiting resistance R12, another link ground connection, the control end of described the first gate-controlled switch K1 is not connected with the output of the voltage checking chip U1 of time delay with described by the 3rd current-limiting resistance R11; Described the first charging capacitor C4 and the first discharge resistance R13 are connected in parallel, and an end is connected with the output of described DC power source unit 10 by described the second current-limiting resistance R12, other end ground connection; Described filter capacitor C11 mono-end is not connected with the output of the voltage checking chip U1 of time delay with described by the 3rd current-limiting resistance R11, other end ground connection.Wherein, filter capacitor C11 is disturbed the output signal with the voltage checking chip U1 of time delay not for preventing interference signal, causes the misoperation of the first gate-controlled switch K1.In practical application, if this interference signal can be ignored, filter capacitor C11 can omit.
During specific implementation, the first gate-controlled switch K1 can be triode, also can be for NMOS pipe etc.
Preferably, the releasing voltage lower than the first voltage checking chip U3 with time delay with the releasing voltage of the voltage checking chip U1 of time delay not in the embodiment of the present invention, for example, the releasing voltage with the voltage checking chip U1 of time delay can not be 2V, with the releasing voltage of the first voltage checking chip U3 of time delay, can be 4V etc.In addition, with the first voltage checking chip U3 of time delay with can be the voltage checking chip of same model with the second voltage detection chip U2 of time delay, and the two can have identical releasing voltage, facilitates like this buying of components and parts.
Below enumerating two examples is described in detail a kind of specific implementation of the over-and under-voltage protective device of the single phase poaer supply system based on shown in Fig. 4 and Fig. 3 respectively.
Example one
The structural representation of the over-and under-voltage protective device that Fig. 5 is the single phase poaer supply system in a correspondence example embodiment illustrated in fig. 4.As shown in Figure 5, but be in series with the coil Coil of circuit breaker L1 in the loop of phase power-supply system live wire L, zero line N.
In this example, what rectification unit 20 adopted is full-wave rectification, utilizes four diode D1, D2, D3, D4 to carry out full-wave rectification to the Voltage-output of single phase poaer supply system.
The internal structure of the DC power source unit 10 in this example is consistent with the internal structure in Fig. 3, repeats no more herein.
Sampling unit 30 in this example comprises: a bleeder circuit, a filter circuit and the first diode D5.
Wherein, bleeder circuit carries out voltage division processing for the Voltage-output to the single phase poaer supply system after described rectification unit 20 rectifications, obtains the sampled voltage signal.Particularly, this bleeder circuit comprises: by least one divider resistance R4, R5 of series connection, the first divider resistance that R6 forms, the second divider resistance consisted of at least one divider resistance R18, R7 of being connected in series.Wherein, an end of the first divider resistance is connected with the output of rectification unit 20, and the other end is connected with the second divider resistance, the other end ground connection of the second divider resistance.The output that the ungrounded end of the second divider resistance is described bleeder circuit.During specific implementation, the first divider resistance can be realized with the resistance of a resistance or other number.Equally, the second divider resistance also can be realized with the resistance of a resistance or other number.
Filter circuit carries out filtering for the sampled voltage signal that described bleeder circuit is obtained, by the filtered sampled voltage signal output obtained.During specific implementation, this filter circuit can comprise a filter capacitor C2 and a discharge resistance R8, and this filter capacitor C2 is connected in parallel with this discharge resistance R8.
The first diode D5 is between described bleeder circuit and described filter circuit, for preventing the sampled voltage signals reverse of described filter circuit.The positive pole of the first diode D5 is connected with the output of bleeder circuit, and negative pole is connected with an end of filter circuit, the other end ground connection of filter circuit.Wherein, the output that the ungrounded end of filter circuit is described sampling unit 30.
In this example, in bleeder circuit, can further comprise a voltage-stabiliser tube Z3, this voltage-stabiliser tube Z3 and the second divider resistance are connected in parallel, for the over-and under-voltage protective device is carried out to surge protection.Certainly, if filter capacitor C2 arranges during specific implementation when enough large, this voltage-stabiliser tube Z3 for surge protection can omit.
The internal structure of the overvoltage judgement delay unit 90 in this example is consistent with the internal structure in Fig. 2 and Fig. 3, repeats no more herein.
Further comprised a bleeder circuit in under-voltage judgement delay unit 100 in this example before not with the voltage checking chip U1 of time delay.In practical application, can be according to the voltage checking chip U1 of time delay with the situation of specifically choosing of the voltage checking chip U2 of time delay, not determining whether to need this bleeder circuit.For example, if choose not with the voltage checking chip U1 of time delay with the combination of the voltage checking chip U2 of time delay, make the releasing magnitude of voltage of the voltage checking chip U1 that is not with time delay and detect magnitude of voltage can meet the demands under current sampled voltage signal, without this bleeder circuit.If can not meet the demands, can to current sampled voltage signal, utilize this bleeder circuit to carry out the adjustment of voltage, make the releasing magnitude of voltage of the voltage checking chip U1 that is not with time delay and detect under the voltage signal of magnitude of voltage after adjustment and can meet the demands.
In this example, this bleeder circuit comprises: the first divider resistance consisted of at least one divider resistance R19, R9 of being connected in series and the second divider resistance consisted of the second diode D6 be connected in series and at least one divider resistance R10.Wherein, an end of described the first divider resistance is connected with the output of described sampling unit 30, and the other end is connected with an end of described the second divider resistance, the other end ground connection of described the second divider resistance; The output that the ungrounded end of described the second divider resistance is described bleeder circuit.Wherein, the second diode D6 is for carrying out temperature-compensating to described the first diode D5 because of the change in pressure drop that variations in temperature causes.In practical application, the change in pressure drop of the first diode D5 that this variations in temperature causes if can ignore, this second diode can omit.
In addition, in this bleeder circuit, can comprise: a filter capacitor C3, carry out filtering for the sampled voltage signal to after dividing potential drop, and filtered sampled voltage signal exported to the voltage checking chip U1 that is not with time delay.
In this example, the first gate-controlled switch K1 in under-voltage judgement delay unit 100 adopts triode Q1 to realize.Other structure in under-voltage judgement delay unit 100 and realization are consistent with the description in Fig. 2 and Fig. 3, repeat no more herein.
The isolation of signal in this example, get or the internal structure of unit 110 consistent with the description in Fig. 3, repeat no more herein.
The main thyristor T1 that adopts of circuit breaker trigger element 80 in this example realizes.The internal structure of this circuit breaker trigger element 80 specifically comprises: the second gate-controlled switch, the 4th current-limiting resistance R15, the 5th current-limiting resistance R14, the second charging capacitor C5, the second discharge resistance R16 and thyristor T1.Wherein, a link of the second gate-controlled switch is connected with the output of described DC power source unit 10 by the 4th current-limiting resistance R15, another link is connected with the end of the second charging capacitor C5, the second discharge resistance R16 and the control end of thyristor T1 respectively, and the control end of described the second gate-controlled switch isolates, gets with described signal by the 5th current-limiting resistance R14 or the output of unit 110 is connected; The other end ground connection of described the second charging capacitor C5 and the second discharge resistance R16; Described thyristor T1 is for the coil L1 Coil action of the circuit breaker of control single phase poaer supply system circuit when conducting.In the example shown in Fig. 5, preferably, the tripping coil L1 Coil of circuit breaker and thyristor T1 are connected in series on the output L and N of individual event power supply.When the T1 conducting, tripping coil L1 Coil can interiorly in short-term obtain large electric current, thereby carries out the action of threading off, and and then impels mechanically circuit breaker to move like this.Fig. 5 has only provided a kind of connected mode of tripping coil and trigger element.Yet the protective device that the present invention proposes can be adapted to multiple different triggerings design and be not limited to situation shown in Fig. 5, and this point is apparent to those skilled in the art.
In addition, the over-and under-voltage protective device in this example further comprises that one is connected to the zero line N of described single phase poaer supply system and the piezo-resistance R17 between live wire L, for described over-and under-voltage protective device is carried out to surge protection.
By adopting a plurality of sub-resistance to form a current-limiting resistance or divider resistance in the circuit such as DC voltage unit and sampling unit, can take full advantage of limited narrow space, and reduce system power dissipation in this real inventive embodiments, realize better area of dissipation.
The workflow of the over-and under-voltage protective device in this example is as follows:
When the single phase alternating current (A.C.) voltage of inputting is greater than 0V, during lower than certain value, lower than predetermined low pressure value (as 30V), now in under-voltage condition, not conducting of voltage-stabiliser tube Z1, voltage-stabiliser tube Z2 both end voltage is 0V, single phase alternating current (A.C.) voltage continuation increase when input, but still while being less than certain value (as 40V), voltage-stabiliser tube Z1 starts conducting, voltage-stabiliser tube Z2 both end voltage is less than certain value, be that VCC voltage is 0 or is less than certain value, the releasing voltage lower than voltage checking chip U1 with the voltage of the sub-VDD of voltage input end of the voltage checking chip U1 of time delay not, voltage checking chip U1 does not export high level, triode Q1 is in cut-off state, because VCC voltage is 0 or is less than certain value, so be also 0 or be less than its releasing voltage with the voltage of the sub-VDD of voltage input end of the voltage checking chip U2 of time delay, now voltage checking chip U2 does not export high level, not conducting of thyristor T1, do not have large electric current to flow through coil.
When input ac voltage increases gradually, now still in under-voltage condition, voltage-stabiliser tube Z1 conducting, the voltage of DC power source unit 10 is enough large, the voltage of the sub-VDD of voltage input end of voltage checking chip U1 is lower than the releasing voltage of voltage checking chip U1, voltage checking chip U1 does not export high level, triode Q1 is in cut-off state, voltage-stabiliser tube Z2 both end voltage starts to increase, VCC voltage starts to increase, now the voltage of the sub-VDD of voltage checking chip U2 voltage input end starts to increase, the voltage of the sub-VDD of voltage input end of voltage checking chip U2 is greater than the releasing voltage of voltage checking chip U2, and be not less than the detection voltage of voltage checking chip U2 within a period of time, now voltage checking chip U2 output high level, now thyristor T1 conducting, large electric current passes through coil, the release mechanism action of circuit breaker.
When input ac voltage continues to increase, now in normal condition, the voltage of the sub-VDD of voltage input end of voltage checking chip U1 is greater than the releasing voltage of voltage checking chip U1, voltage checking chip U1 exports high level, triode Q1 is in conducting state, now the voltage of the sub-VDD of voltage checking chip U2 voltage input end is 0, and voltage checking chip U2 does not export high level.Now the voltage of the sub-VDD of voltage input end of voltage checking chip U3 is less than the detection voltage of voltage checking chip U3, and now voltage checking chip U3 does not export high level, and now not conducting of thyristor T1 does not have large electric current to flow through coil.
When input ac voltage continues to increase, now in overvoltage condition, the voltage of the sub-VDD of voltage input end of voltage checking chip U3 is greater than the releasing voltage of voltage checking chip U3, and be not less than the detection voltage of voltage checking chip U3 within a period of time, now voltage checking chip U3 output high level, now thyristor T1 conducting, large electric current is by coil, the release mechanism action of circuit breaker.
Example two
The structural representation of the over-and under-voltage protective device that Fig. 6 is the single phase poaer supply system in a correspondence example embodiment illustrated in fig. 3.As shown in Figure 6, in this example, the voltage-stabiliser tube Z1 in Fig. 5 is replaced with to current-limiting resistance R3, and other structures are consistent.
The workflow of the over-and under-voltage protective device in this example is as follows:
When the single phase alternating current (A.C.) voltage of inputting is greater than 0V, and during lower than under-voltage reference value, now in under-voltage condition, voltage-stabiliser tube Z2 both end voltage increases to stationary value gradually, the releasing voltage lower than voltage checking chip U1 with the voltage of the sub-VDD of voltage input end of the voltage checking chip U1 of time delay not, voltage checking chip U1 does not export high level, triode Q1 is in cut-off state, be greater than its releasing voltage with the voltage of the sub-VDD of voltage input end of the voltage checking chip U2 of time delay, and be not less than the detection voltage of voltage checking chip U2 within a period of time, now voltage checking chip U2 output high level, thyristor T1 conducting, large electric current passes through coil, the release mechanism action of circuit breaker.
When input ac voltage continues to increase, now in normal condition, the voltage of the sub-VDD of voltage input end of voltage checking chip U1 is greater than the releasing voltage of voltage checking chip U1, voltage checking chip U1 exports high level, triode Q1 is in conducting state, now the voltage of the sub-VDD of voltage checking chip U2 voltage input end is 0, and voltage checking chip U2 does not export high level.Now the voltage of the sub-VDD of voltage input end of voltage checking chip U3 is less than the detection voltage of voltage checking chip U3, and now voltage checking chip U3 does not export high level, and now not conducting of thyristor T1 does not have large electric current to flow through coil.
When input ac voltage continues to increase, now in overvoltage condition, the voltage of the sub-VDD of voltage input end of voltage checking chip U3 is greater than the releasing voltage of voltage checking chip U3, and be not less than the detection voltage of voltage checking chip U3 within a period of time, now voltage checking chip U3 output high level, now thyristor T1 conducting, large electric current is by coil, the release mechanism action of circuit breaker.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (12)
1. the protective device of the over-and under-voltage for the single phase poaer supply system; comprise: DC power source unit (10), rectification unit (20), sampling unit (30), overvoltage judgement delay unit (90), under-voltage judgement delay unit (100) and circuit breaker trigger element (80), wherein:
Described DC power source unit (10) is for providing the galvanic current source;
Described rectification unit (20) is exported after being converted to direct current for the Voltage-output by described single phase poaer supply system by interchange;
Described sampling unit (30) is sampled for the Voltage-output to after described rectification unit (20) rectification, and output sampled voltage signal;
Described overvoltage judgement delay unit (90) is the first voltage checking chip (U3) with time delay, for the sampled voltage signal that judges current input whether higher than self releasing voltage, as higher than, start the time delay of the first setting-up time, and whether the sampled voltage signal that judges current input in this first setting-up time is not less than the detection voltage of self, in this way, export triggering signal, wherein remove voltage higher than detecting voltage;
Described under-voltage judgement delay unit (100) comprising: not with the voltage checking chip (U1) of time delay, with the RC charging circuit (101) of the first gate-controlled switch with the second voltage detection chip (U2) of time delay,
Wherein said not with the voltage checking chip (U1) of time delay for the sampled voltage signal that judges current input whether higher than self releasing voltage, as higher than, export normal state signal, and, when the sampled voltage signal of current input is not less than the detection voltage of self, maintain this normal state signal; Otherwise, do not export this normal state signal;
The described charging circuit of the RC with gate-controlled switch (101) described not with the voltage checking chip (U1) of time delay while exporting described normal state signal, described the first gate-controlled switch is in closure state, described RC charging circuit (101) does not charge, described not with the voltage checking chip (U1) of time delay while not exporting described normal state signal, described the first gate-controlled switch is in off-state, described RC charging circuit (101) is charged by described DC power source unit (10), and exports corresponding detectable voltage signals;
The described detection chip of the second voltage with time delay (U2) for the detectable voltage signals that judges current input whether higher than self releasing voltage, as higher than, start the time delay of the second setting-up time, and whether the detectable voltage signals that judges current input in this second setting-up time is not less than the detection voltage of self, in this way, export triggering signal;
Described circuit breaker trigger element (80), for when receiving the triggering signal of described overvoltage judgement delay unit (90) or described under-voltage judgement delay unit (100) output, makes the coil motion of the circuit breaker in described single phase poaer supply system circuit.
2. system according to claim 1, is characterized in that, described DC power source unit (10) is undertaken producing after dividing potential drop and voltage stabilizing by the Voltage-output to the single phase poaer supply system.
3. system according to claim 2, it is characterized in that, described DC power source unit (10) comprises a threshold decision unit, for the Voltage-output to described single phase poaer supply system, judged, at described Voltage-output during lower than the low pressure threshold set, make described DC power source unit (10) export 0 voltage or be less than the voltage of a stationary value; During higher than the low pressure threshold set, make described DC power source unit (10) stable output threshold voltage at described Voltage-output.
4. system according to claim 3, it is characterized in that, described DC power source unit (10) comprising: the first current-limiting resistance, the first voltage-stabiliser tube (Z1), storage capacitor (C1) and the second voltage-stabiliser tube (Z2) that at least one current-limiting resistance (R1, R2) be connected in series, consist of; One end of described the first current-limiting resistance is connected with the output of rectification unit (20), and the other end is connected with the backward end of the first voltage-stabiliser tube (Z1); The forward end of described the first voltage-stabiliser tube (Z1) is connected with an end of described storage capacitor (C1) and the backward end of described the second voltage-stabiliser tube (Z2) respectively, the forward end ground connection of the other end of described storage capacitor (C1) and described the second voltage-stabiliser tube (Z2); Wherein, the output that the backward end of described the second voltage-stabiliser tube (Z2) is described DC power source unit (10); Described the first voltage-stabiliser tube (Z1) is at the voltage signal of described rectification unit (20) output during lower than the low pressure threshold set, not conducting; At the voltage signal of described rectification unit (20) output during higher than the low pressure threshold set, conducting.
5. according to the described system of any one in claim 1 to 4, it is characterized in that, described under-voltage judgement delay unit (100) also comprises: the first bleeder circuit, carry out after voltage division processing exporting to described not with the voltage checking chip (U1) of time delay for the sampled voltage signal to from sampling unit (30); Described not with the voltage checking chip (U1) of time delay the sampled voltage signal after for the dividing potential drop that judges current input whether higher than self releasing voltage, as higher than, export described normal state signal, and the sampled voltage signal after the dividing potential drop of current input maintains this normal state signal while being not less than the detection voltage of self; Otherwise, do not export described normal state signal.
6. system according to claim 5, is characterized in that, described sampling unit (30) comprising: the second bleeder circuit, filter circuit and the first diode (D5);
Described the second bleeder circuit carries out voltage division processing for the Voltage-output to the single phase poaer supply system after described rectification unit (20) rectification, obtains the sampled voltage signal;
Described filter circuit carries out filtering for the sampled voltage signal that described bleeder circuit is obtained, by the filtered sampled voltage signal output obtained;
Described the first diode (D5) is between described bleeder circuit and described filter circuit, for preventing the reverse direction current flow of described filter circuit;
Described the first bleeder circuit comprises: the first divider resistance consisted of at least one divider resistance (R19, R9) be connected in series and the second divider resistance consisted of the second diode (D6) be connected in series and at least one divider resistance (R10); One end of described the first divider resistance is connected with the output of described sampling unit (30), and the other end is connected with an end of described the second divider resistance, the other end ground connection of described the second divider resistance; The output that the ungrounded end of described the second divider resistance is described the first bleeder circuit; Described the second diode (D6) is for compensating because of the change in pressure drop that variations in temperature causes described the first diode (D5).
7. according to the described system of any one in claim 1 to 4, it is characterized in that, the described charging circuit of the RC with the first gate-controlled switch (101) comprising: the first gate-controlled switch (K1), the second current-limiting resistance (R12), the 3rd current-limiting resistance (R11), the first charging capacitor (C4) and the first discharge resistance (R13);
A link of described the first gate-controlled switch (K1) is connected with the output of described DC power source unit (10) by the second current-limiting resistance (R12), another link ground connection, the control end of described the first gate-controlled switch (K1) is not connected with the output of the voltage checking chip (U1) of time delay with described by the 3rd current-limiting resistance (R11); Described the first charging capacitor (C4) and the first discharge resistance (R13) are connected in parallel, and an end is connected with the output of described DC power source unit (10) by described the second current-limiting resistance (R12), other end ground connection.
8. system according to claim 7, is characterized in that, described the first gate-controlled switch (K1) is the first triode (Q1) or NMOS pipe.
9. according to the described system of any one in claim 1 to 4, it is characterized in that, described system further comprises: signal is isolated, is got or unit (110), isolated respectively and focused on a bit for the output to described overvoltage judgement delay unit (90) and described under-voltage judgement delay unit (100), when therein arbitrary is output as triggering signal, triggering signal is exported to described circuit breaker trigger element (80).
10. according to the system shown in claim 9, it is characterized in that, described circuit breaker trigger element (80) comprising: the second gate-controlled switch, the 4th current-limiting resistance (R15), the 5th current-limiting resistance (R14), the second charging capacitor (C5), the second discharge resistance (R16) and thyristor (T1);
A link of described the second gate-controlled switch is connected with the output of described DC power source unit (10) by the 4th current-limiting resistance (R15), another link is connected with an end of the second charging capacitor (C5), the second discharge resistance (R16) and the control end of thyristor (T1) respectively, and the control end of described the second gate-controlled switch isolates, gets with described signal by the 5th current-limiting resistance (R14) or the output of unit (110) is connected; The other end ground connection of described the second charging capacitor (C5) and the second discharge resistance (R16); Described thyristor (T1) is for coil (L1 Coil) action of the circuit breaker of controlling the single phase poaer supply system circuit when the conducting.
11. system according to claim 10, is characterized in that, described the second gate-controlled switch (K2) is the second triode (Q2) or NMOS pipe.
12. according to the described system of any one in claim 1 to 4; it is characterized in that; described system further comprises: be connected to zero line and the piezo-resistance between live wire (R17) of described single phase poaer supply system, for described over-and under-voltage protective device is carried out to surge protection.
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| CN201210195009.3A CN103490376B (en) | 2012-06-13 | 2012-06-13 | For the over-and under-voltage protective device of single-phase source system |
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| CN105811364A (en) * | 2014-12-31 | 2016-07-27 | 上海良信电器股份有限公司 | Control circuit of circuit breaker under voltage/shunt integration tripping device |
| CN109991467A (en) * | 2017-12-29 | 2019-07-09 | 西门子股份公司 | The confirmation of overvoltage |
| CN113381084A (en) * | 2021-05-25 | 2021-09-10 | 中国人民解放军国防科技大学 | Calibration circuit, battery protection chip and calibration method of calibration circuit |
| CN113740595A (en) * | 2021-11-04 | 2021-12-03 | 四川力士达智慧照明科技有限公司 | Single-phase alternating current voltage detection protection circuit based on mutual inductor |
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| CN113740595A (en) * | 2021-11-04 | 2021-12-03 | 四川力士达智慧照明科技有限公司 | Single-phase alternating current voltage detection protection circuit based on mutual inductor |
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