CN105633904A - Switch circuit for protective circuit and terminal - Google Patents
Switch circuit for protective circuit and terminal Download PDFInfo
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- CN105633904A CN105633904A CN201610079380.1A CN201610079380A CN105633904A CN 105633904 A CN105633904 A CN 105633904A CN 201610079380 A CN201610079380 A CN 201610079380A CN 105633904 A CN105633904 A CN 105633904A
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- 230000001681 protective effect Effects 0.000 title abstract description 5
- 238000000034 method Methods 0.000 claims description 8
- 230000001960 triggered effect Effects 0.000 abstract description 2
- 230000000087 stabilizing effect Effects 0.000 abstract 4
- CNQCVBJFEGMYDW-UHFFFAOYSA-N lawrencium atom Chemical compound [Lr] CNQCVBJFEGMYDW-UHFFFAOYSA-N 0.000 description 21
- 230000000694 effects Effects 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002688 persistence Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/207—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage also responsive to under-voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/28—Modifications for introducing a time delay before switching
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides a switch circuit for a protective circuit and a terminal. The switch circuit comprises a voltage output end, a voltage stabilizing source, a bleeder circuit and a comparator component, wherein an input end of the voltage stabilizing source is connected with the voltage output end; the bleeder circuit is connected with the voltage output end; the comparator component is connected with an output end of the voltage stabilizing source and the output end of the bleeder circuit respectively; and the comparator component is configured to compare an output voltage of the voltage stabilizing source with the output voltage of the bleeder circuit and to determine whether the protective circuit is triggered or not. The invention further provides a novel switch circuit for the protective circuit.
Description
Technical field
The present invention relates to circuit engineering, particularly relate to a kind of on-off circuit protecting circuit and terminal.
Background technology
When Switching Power Supply supply voltage lower than certain value or higher than certain value time, can result in cannot work to the equipment of being powered even damages. Therefore, in order to avoid the problems referred to above, prior art generally can arrange overvoltage, power supply unit is protected by under-voltage protecting circuit.
As shown in FIG. 1A and 1B, the on-off circuit schematic diagram of respectively the on-off circuit schematic diagram of under-voltage protecting circuit of the prior art and overvoltage crowbar. The power supply of the present embodiment provides electric power to Switching Power Supply, and the electric power that power supply is provided by Switching Power Supply carries out processing as being powered equipment offer electric power. Switching Power Supply there is more complicated circuit arrange, before therefore starting to the voltage output end of Switching Power Supply to set up voltage from connection power supply, need the regular hour.
As shown in Figure 1A, the on-off circuit of this under-voltage protecting circuit includes resistance 131, zener diode 132, diode 133, resistance 134, electric capacity 135, audion 136, resistance 137, diode 138 and resistance 139, wherein, resistance 131, zener diode 132, diode 133 is sequentially connected in series, resistance 131 is connected with voltage output end V1, first end of resistance 134 connects the negative pole end of diode 133, second end ground connection of resistance 134, electric capacity 135 is in parallel with resistance 134, the base stage of the first end connecting triode 136 of resistance 134, the colelctor electrode of audion 138 is connected between the first end of resistance 137 and the positive terminal of diode 138, second end of resistance 137 is connected with power supply VCC, the grounded emitter of audion 138, the negative pole end of diode 138 connects resistance 139, the other end of resistance 139 is connected with under-voltage protecting circuit L1. specifically, after power supply VCC powers on, the voltage of voltage output end V1 is set up rapidly, if normal circuit operation, then resistance 131, zener diode 132, diode 133 turn on, and then audion 136 turns on, grounded emitter due to audion 136, therefore the colelctor electrode output low level of audion 136, diode 138 is not turned on, and so will not trigger overvoltage crowbar L1. when the voltage of voltage output end is reduced to below normal range of operation, Zener diode 132 is not turned on, and diode 138 is not turned on, audion 136 is not turned on, the colelctor electrode output high level of audion 136, diode 138 turns on, and then triggers under-voltage protecting circuit L1. can be selected so that each device of the circuit shown in Figure 1A turns on a preset condition based or is not turned on according to the model of each device.
As shown in Figure 1B, this overvoltage crowbar includes resistance 140, Zener diode 141, diode 142, resistance 143, electric capacity 144, resistance 145, resistance 146, diode 147, resistance 148, audion 149, resistance 150, resistance 151, audion 152, this Zener diode 141 is different from zener diode 132 model in Figure 1A, and turn-on condition is also different. wherein, first end of resistance 140 connects voltage output end V1, second end of resistance 140 is connected with the negative pole end of Zener diode 141, the positive terminal of Zener diode 141 is connected with the positive terminal of diode 142, the negative pole end of diode 142 connects the first end of resistance 143, electric capacity 144 is in parallel with resistance 150, first end of electric capacity 144 is connected between the second end of resistance 143 and the first end of resistance 146, and the first end of electric capacity 144 is connected with the base stage of audion 149, second end ground connection of electric capacity 144, the grounded emitter of audion 149, second end of resistance 146 is connected between the positive terminal of diode 147 and the colelctor electrode of audion 152, the negative pole end of diode 147 is connected with the first end of resistance 145, second end of resistance 145 connects overvoltage crowbar L2, the emitter stage of audion 152 is all connected with power supply VCC with the first end of resistance 151, second end of resistance 151 is connected with the first end of resistance 148, second end of resistance 148 is connected with the colelctor electrode of audion 149, the base stage of audion 152 is connected between resistance 148 and resistance 151. specifically, after power supply VCC powers on, the voltage of voltage output end V1 is set up rapidly, if normal circuit operation, then Zener diode 141 is not turned on, diode 142 is not turned on, audion 152 is not turned on, and then diode 147 is not turned on, overvoltage crowbar L2 will not be triggered, if the voltage of voltage output end is beyond normal voltage range, Zener diode 141 turns on, diode 142 turns on, the base stage of audion 149 becomes high level, audion 149 turns on, grounded emitter due to audion 149, therefore the base stage of audion 152 is low level, audion 152 turns on, and then the current collection of audion 152 extremely high level, the base stage simultaneously maintaining audion 149 is high level, second end output high level of resistance 148, trigger overvoltage crowbar L2.
Summary of the invention
The present invention provides a kind of on-off circuit protecting circuit and terminal, to provide the on-off circuit of a kind of new protection circuit.
One aspect of the invention provides a kind of on-off circuit protecting circuit, including:
Voltage output end;
Source of stable pressure, the input of described source of stable pressure is connected with described voltage output end;
Bleeder circuit, is connected with described voltage output end;
Comparator element; it is connected with the outfan of the outfan of described source of stable pressure and described bleeder circuit respectively; described comparator element is configured to the output voltage of source of stable pressure described in comparison and the output voltage of described bleeder circuit, and determines whether to trigger described protection circuit.
Another aspect of the present invention provides a kind of terminal, including:
Including the on-off circuit described in any of the above-described item, also including under-voltage protecting circuit and overvoltage crowbar, described first comparator connects described under-voltage protecting circuit, and described second comparator connects described overvoltage crowbar.
As shown from the above technical solution; the on-off circuit of protection circuit provided by the invention and terminal; there is provided reference voltage as comparing voltage by arranging source of stable pressure for comparator element; make comparator element when voltage output end normal operation again through bleeder circuit; comparator element will not trigger protection circuit; and when voltage output end non-normal working, comparator element trigger protection circuit, and then reach to protect the purpose of the equipment of being powered.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described 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 premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Figure 1A is the structural representation of the on-off circuit of under-voltage protecting circuit according to an embodiment of the invention;
Figure 1B is the structural representation of the on-off circuit of overvoltage crowbar according to an embodiment of the invention;
Fig. 2 is the on-off circuit protecting circuit according to an embodiment of the invention;
Fig. 3 is the on-off circuit protecting circuit according to another embodiment of the present invention;
Fig. 4 is the on-off circuit of the protection circuit according to further embodiment of this invention.
Accompanying drawing labelling:
101-source of stable pressure 102-bleeder circuit 103-comparator element
106-first input port 107-the second input port 108-four-input terminal mouth
109-the 3rd input port 131-resistance 132-Zener diode
133-diode 134-resistance 135-electric capacity
136-audion 137-resistance 138-diode
139-resistance 140-resistance 141-Zener diode
142-diode 143-resistance 144-electric capacity
145-resistance 146-resistance 147-diode
148-resistance 149-audion 150-resistance
151-resistance 152-audion 201-the first delay circuit
202-first inputs high electricity 203-second and inputs high electricity 204-the second delay circuit
The flat signal circuit of flat signal circuit
301-resistance 302-the first resistance 303-the first electric capacity
304-the second electric capacity 305-the first diode 306-the second resistance
307-the 4th electric capacity 308-the 4th electricity group 309-the second diode
310-the 3rd resistance 311-the 3rd electric capacity 312-the 5th resistance
313-the 6th resistance 314-the 7th resistance 315-the 8th resistance
316-the 9th resistance 317-the first output port 318-the 4th diode
319-the second output port 320-the 3rd diode 321-resistance
322-electric capacity 323-resistance 324-resistance
325-electric capacity 326-resistance 327-resistance
V1-voltage output end VCC-power supply
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiments. Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
Embodiment one
The present embodiment provides a kind of on-off circuit protecting circuit, for triggering or close protection circuit. As in figure 2 it is shown, be the structural representation of the on-off circuit protecting circuit according to the present embodiment.
The on-off circuit of the protection circuit of the present embodiment includes voltage output end V1, source of stable pressure 101, bleeder circuit 102 and comparator element 103.
Wherein, the input of source of stable pressure 101 is connected with voltage output end V1; Bleeder circuit 102 is connected with voltage output end V1; Comparator element 103 is connected with power supply VCC; this comparator element 103 is connected with the outfan of the outfan of source of stable pressure 101 and bleeder circuit 102 respectively; comparator element 101 is configured to compare the output voltage of the output voltage of source of stable pressure 101 and bleeder circuit 102, and determines whether trigger protection circuit (not shown).
The source of stable pressure of the present embodiment can be TL431 source of stable pressure, and this TL431 is controllable accurate source of stable pressure, and it is influenced by temperature less, and reliability is higher.
The bleeder circuit 102 of the present embodiment can be made up of resistance, as long as dividing potential drop effect can be played. That is, this bleeder circuit 102 plays the effect that the voltage output end V1 voltage exported carries out dividing potential drop.
The protection circuit of the present embodiment can be under-voltage protecting circuit, it is also possible to for overvoltage crowbar, it is also possible to include under-voltage protecting circuit and overvoltage crowbar simultaneously, specifically can set according to actual needs, not repeat them here.
In the present embodiment, after power supply VCC powers on, supply voltage VCC needs the conversion through photovoltaic conversion module to set up the V1 of voltage output end later, therefore, after power supply VCC powers on, the voltage output end V1 of on-off circuit can gradually build up, that is, being power-up to from power supply VCC when the voltage of the voltage output end V1 of on-off circuit is positioned at normal working voltage scope and need certain interval of time, the voltage that this voltage output end V1 exports can be powered the voltage needed for equipment. This is powered the display of mainboard that equipment is such as LCD TV or LCD TV.
The on-off circuit of the protection circuit according to the present embodiment; there is provided reference voltage as comparing voltage by arranging source of stable pressure 101 for comparator element 103; make comparator element 103 when voltage output end V1 normal operation again through bleeder circuit 102; comparator element 103 will not trigger protection circuit; and when voltage output end V1 non-normal working; comparator element 103 trigger protection circuit, and then reach to protect the purpose of the equipment of being powered.
Embodiment two
Within the time period that power supply VCC powers on and the voltage of voltage output end V1 does not set up, owing to comparator unit directly receives the power supply of power supply unit VCC, therefore after power supply unit VCC powers on, comparator unit is started working, but now V1 is but without setting up, therefore the voltage of each input port of comparator element is all 0V, according to two input ports, comparator element cannot judge that the voltage of which input port is high or low, and then can be interfered, there is certain probability mistake output high level to trigger and protect circuit accordingly. therefore, the present embodiment increases input high level signal circuit on the basis of the on-off circuit of above-described embodiment and/or delay circuit is tried one's best and avoided the problem of erroneous trigger protection circuit, as shown in Figure 3. input high level signal circuit can the better simply circuit of choice structure, such as only it is made up of resistance and switch element, and be connected between input high level signal and input port, therefore after power supply VCC powers on, can be just almost the input port input high level signal connected at once, additionally, owing to the voltage of voltage output end V1 is before setting up, need to through a series of process, such as it is likely to through CPU (CentralProcessingUnitCPU, central processing unit), D/A converting circuit, drive parameter generation circuit, the process of the complicated circuits such as analog to digital conversion circuit, the time of the needs that the Voltage Establishment of voltage output end V1 gets up is longer, assuming to be power-up to the port corresponding to input high level signal circuit from power supply VCC, to be transfused to the interval of high level signal be T1, the interval being positioned at normal range of operation from the voltage being power-up to voltage output end V1 from power supply VCC is T2, then T2 > T1, therefore, before the Voltage Establishment of voltage output end V1 gets up, input high level signal circuit can give corresponding input port input high level signal.
First illustrate to increase the situation of input high level signal circuit in the on-off circuit of above-described embodiment:
When comparator element includes a comparator, it is possible to have following two situation:
The first situation: comparator element 103 is provided with first input port 106 and the second input port 107, first input port 106 connects bleeder circuit, second input port 107 connects source of stable pressure, when the voltage of voltage output end is in normal range of operation, the voltage of first input port 106 is more than the voltage of the second input port 107;
On-off circuit also includes:
First input high level signal circuit 202, is connected with power supply and first input port 106 respectively, and the first input high level signal circuit 202 is used for when power supply powers on first input port 106 input high level signal;
Further, when the voltage of described voltage output end V1 is in normal range of operation, described first input high level signal circuit 202 stops to described first input port 106 input high level signal.
In this first situation, comparator element 103 when the voltage of first input port 106 is less than the voltage of the second input port 107, can trigger and protect circuit accordingly, and this protection circuit can be under-voltage protecting circuit.
In addition; before this first input high level signal circuit 202 is mainly used in after power supply powers on and the voltage of voltage output end do not set up; make its voltage more than the second input port 107 for first input port 106 applies certain voltage, to avoid comparator element 103 false judgment and then erroneous trigger protection circuit. Specifically diode can be set in the first input high level signal circuit 202, the voltage of first input port 106 when making voltage that high level signal the is corresponding voltage less than described voltage output end V1 in normal range of operation, and then diode is ended, so that the first input high level signal circuit 202 stops powering to first input port 106. First input high level signal also can be merely greater than 0V, but much smaller than the output of bleeder circuit, exemplary, a little magnitude, even if now the output of the first high level signal is persistence, inventor can suitably adjust the output of source of stable pressure, without impact to under-voltage detection. Other feasible schemes can certainly be adopted.
The second situation: comparator element 103 is provided with the 3rd input port 109 and four-input terminal mouth 108,3rd input port 109 connects source of stable pressure, four-input terminal mouth 108 connects bleeder circuit, when the voltage of voltage output end is in normal range of operation, the voltage of the 3rd input port 109 is more than the voltage of four-input terminal mouth 108;
On-off circuit also includes:
Second input high level signal circuit 203, is connected with the 3rd input port 109 of power supply and comparator element 103 respectively, and the second input high level signal circuit 203 is used for when power supply powers on the 3rd input port 109 input high level signal;
Further, when the voltage of described voltage output end V1 is in normal range of operation, described second input high level signal circuit 203 stops to described 3rd input port 109 input high level signal. Second input high level signal also can be merely greater than 0V, but much smaller than the output of source of stable pressure circuit, exemplary, a little magnitude, even if now the output of the first high level signal is persistence, inventor can suitably adjust the output of bleeder circuit, without the detection affected overvoltage pressure. Other schemes can certainly be adopted.
In this second situation, comparator element 103 when the voltage of the 3rd input port 109 is less than the voltage of four-input terminal mouth 108, can trigger and protect circuit accordingly, and this protection circuit can be overvoltage crowbar.
In addition; before this second input high level signal circuit 203 is mainly used in after power supply powers on and the voltage of voltage output end do not set up; it is that the 3rd input port 109 applies certain voltage and makes its voltage more than four-input terminal mouth 108, to avoid comparator element 103 false judgment and then erroneous trigger protection circuit. Specifically diode can be set in the second input high level signal circuit 203, the voltage of the 3rd input port 109 when making voltage that high level signal the is corresponding voltage less than described voltage output end V1 in normal range of operation, and then diode is ended, so that the second input high level signal circuit 203 stops powering to the 3rd input port 109.
In addition, when comparator element 103 includes two comparators, when namely including two comparators of above-mentioned two situations, set comparator in the first situation as the first comparator, comparator in the second situation is the second comparator, then the first comparator is provided with first input port 106 and the second input port 107, and the second comparator is provided with the 3rd input port 109 and four-input terminal mouth 108; First input port 106 is connected with bleeder circuit, and the second input port 107 is connected with source of stable pressure, and the 3rd input port 109 connects source of stable pressure, and four-input terminal mouth 108 connects bleeder circuit, and on-off circuit also includes:
First input high level signal circuit 202, it is connected with the first input port 106 of power supply and comparator element 103 respectively, first input high level signal circuit 202 is used for when power supply powers on first input port 106 input high level signal, and when the voltage of described voltage output end V1 is in normal range of operation, described first input high level signal circuit 202 stops to described first input port 106 input high level signal;
Second input high level signal circuit 203, it is connected with the 3rd input port 109 of power supply and comparator element 103 respectively, second input high level signal circuit 203 is used for when power supply powers on the 3rd input port 109 high level signal, and the voltage of described voltage output end V1 in normal range of operation, described second input high level signal circuit 203 stops to described 3rd input port 109 input high level signal;
Wherein, when the voltage of voltage output end is in normal range of operation, the voltage of first input port 106 is more than the voltage of the second input port 107, and the voltage of the 3rd input port 109 is more than the voltage of four-input terminal mouth 108.
The first input high level signal circuit 202 in this kind of situation and the second input high level signal circuit 203 as hereinbefore, do not repeat them here. Additionally, overvoltage crowbar in this kind of situation and under-voltage protecting circuit common sparing circuit, therefore, it is possible to save the layout area of circuit, reducing the use of device, reduce cost, integrated level is high.
Then illustrate to increase in the above-described embodiments the situation of delay circuit:
As a kind of exemplary illustration, the on-off circuit of the present embodiment also includes the first delay circuit 201, and this first time delay road 201 is connected with source of stable pressure 101, for the input voltage of source of stable pressure 101 is carried out delay process. Source of stable pressure 101 provides reference voltage for each comparator for comparator element, the effect arranging the first delay circuit 201 on source of stable pressure 101 is in that, the time of setting up of reference voltage can be controlled, and then the time of the second input port 107 input voltage can be controlled, with ensure as far as possible the voltage of the second input port 107 between the Voltage Establishment of voltage output end V1 gets up less than the voltage of first input port 106, and then avoid the first comparator to be interfered as far as possible, mistake output high level.
Alternatively exemplary illustration, the on-off circuit of the present embodiment also includes the second delay circuit 204, this the second delay circuit 204 second input port 107 connects, and the second delay circuit 204 is for carrying out delay process to the input voltage of the second input port 107. So; can further such that the voltage time delay of the second input port 107 inputs; guarantee within the time period that power supply VCC powers on and output voltage does not set up; the voltage of first input port 106 is higher than the voltage of the second input port 107; and then ensure in this time period; first output port output is low level, it is to avoid erroneous trigger overvoltage crowbar.
Each high level signal circuit of the present embodiment can be separately provided, it is also possible to is simultaneously located in on-off circuit with each delay circuit, specifically can set according to actual needs, not repeat them here.
The on-off circuit of the protection circuit according to the present embodiment, by arranging input high level signal circuit and/or delay circuit for comparator element, make after power supply powers on and before the Voltage Establishment of voltage output end gets up, ensure the comparator element input port input high level signal that during normal operation, voltage should be higher after the Voltage Establishment of voltage output end gets up as far as possible, and then it can be avoided that after power supply powers on and before the Voltage Establishment of voltage output end gets up during this period of time in, the situation of comparator element meeting erroneous trigger protection circuit.
Embodiment three
The present embodiment provides the specific implementation of a kind of on-off circuit.
As shown in Figure 4, for the structural representation of the on-off circuit according to the present embodiment.
The source of stable pressure 101 of the present embodiment adopts TL431 source of stable pressure. First end of this source of stable pressure 101 connects power supply VCC by resistance 301, the second end ground connection of source of stable pressure 101. The effect of this resistance 301 is to play metering function, so that the electric current flowing through TL431 source of stable pressure will not be excessive, TL431 source of stable pressure is played a protective role.
The comparator element 103 of the present embodiment can be arranged on a single die, as shown in Figure 4, and the first comparator and the second comparator common power supply power supply VCC and earth terminal GND.
The first delay circuit 201 in the present embodiment includes the first resistance the 302, first electric capacity 303 and the second electric capacity 304, first end of the first resistance 302 and the first end of the first electric capacity 303 connect, second end of the first resistance 302 is connected to the negative pole end of source of stable pressure 101, second end of the first electric capacity 303 is connected to the positive terminal of source of stable pressure 101, first end of the second electric capacity 304 is connected to the negative pole of source of stable pressure 101, second end of the second electric capacity 304 is connected to the positive terminal of source of stable pressure 101, the positive terminal ground connection of source of stable pressure 101. Specifically, the second end of the first resistance 302 is connected between the negative pole end of source of stable pressure 101 and resistance 301.
First resistance the 302, first electric capacity 303 and 304 values of the second electric capacity in this first delay circuit 201 all can set according to actual needs, the time that the reference voltage to control source of stable pressure 101 is set up.
The first input high level signal circuit 202 of the present embodiment includes the first diode the 305, second resistance 306 and the 4th electric capacity 307, first end of the second resistance 306 connects power supply VCC, second end of the second resistance 306 connects the positive terminal of the first diode 305, the negative pole end of the first diode 305 connects first input port 106 and bleeder circuit 102, first end of the 4th electric capacity 307 connects the first end of the second resistance 306, the second end ground connection of the 4th electric capacity 307.
The second input high level signal circuit 203 of the present embodiment includes the 4th resistance the 308, second diode 309 and the 3rd resistance 310, first end of the 4th resistance 308 connects power supply VCC, second end of the 4th resistance 308 and the positive terminal of the second diode 309 connect, the negative pole end of the second diode 309 and the first end of the 3rd resistance 310 connect, second end ground connection of the 3rd resistance 310, the 3rd input port 106 is connected between the second diode 309 and the 3rd resistance 310.
Second delay circuit 204 of the present embodiment includes the 3rd electric capacity 311 and the 5th resistance 312, first end of the 3rd electric capacity 311 and the first end of the 5th resistance 312 are connected to the second input port 107, the second end of the 3rd electric capacity 311 and the second equal ground connection of end of the 5th resistance 312.
The bleeder circuit 102 of the present embodiment includes the 6th resistance 313, 7th resistance 314, 8th resistance 315 and the 9th resistance 316, first end of the 6th resistance 313 and the first end of the 8th resistance 315 are all connected with voltage output end V1, second end of the 6th resistance 313 and the first end of the 7th resistance 314 connect, second end ground connection of the 7th resistance 314, second end of the 8th resistance 315 and the first end of the 9th resistance 316 connect, second end ground connection of the 9th resistance 316, four-input terminal mouth 108 is connected between the 8th resistance 315 and the 9th resistance 316, first output port 106 is connected between the 6th resistance 313 and the 7th resistance 314.
In addition; it is provided with the 4th diode 318 between first output port 317 and the under-voltage protecting circuit of first comparator of the present embodiment; the positive terminal of the 4th diode 318 connects the first output port 317; the negative pole end of the 4th diode 318 connects under-voltage protecting circuit; it is provided with the 3rd diode 320 between second output port 319 and the overvoltage crowbar of the second comparator; the positive terminal of the 3rd diode 320 connects the second output port 319, and the negative pole end of the 3rd diode connects overvoltage crowbar.
For preventing, the voltage in under-voltage protecting circuit is counter pours into the first output port 317 to 4th diode 318; cause the damage of comparator element 103; 3rd diode 320 for preventing the voltage of overvoltage crowbar from reviewing such as the second output port 319, cause the damage of comparator element 103.
In addition, between the second output port 319 and the negative pole end of the second diode 309, electric capacity 322 and resistance 323 are set, electric capacity 322 and resistance 323 constitute compensation circuit, to eliminate the self-oscillation in on-off circuit, correspondingly, resistance 324 and electric capacity 325, resistance 324 and electric capacity 325 are set between first input port 106 and the negative pole end of the first diode 305 and constitute compensation circuit, to eliminate the self-oscillation in on-off circuit. In addition, between the 3rd input port 309 and source of stable pressure 101, resistance 326 can be set, resistance 326 and the 3rd resistance 310 play dividing potential drop effect, so can pass through arrange the resistance of resistance 326 and the 3rd resistance 310 and then adjust the voltage of the 3rd input port 109, between the second input 107 and source of stable pressure 101, resistance 327 is set, resistance 327 and the 5th resistance 312 play dividing potential drop effect, so can pass through arrange the resistance of resistance 327 and the 5th resistance 312 and then adjust the voltage of the second input port 107.
The specific works principle of the on-off circuit of the present embodiment is:
If this power supply is for monitor power supply, when power supply VCC starts power up, now the voltage of output voltage terminal V1 does not also set up, and due to the time-lag action of the first delay circuit 201, the voltage of source of stable pressure 101 is not also set up at once. After power supply VCC powers on, diode 309 turns on, and then first input high level signal circuit 202 can be first input port 106 input high level, in like manner, diode 305 turns on, and then second input high level signal circuit 203 can be the 3rd input port 109 input high level, to ensure in the process of start, the voltage of first input port 106 is higher than the voltage of the second input port 107, the voltage of four-input terminal mouth 108 is lower than the voltage of the 3rd input port 109, and then avoids comparator element 103 mistake output high level. Additionally, due to the effect of the second delay circuit 204 so that the time of setting up of the voltage of the second input port 107 is further delayed, and then can be further ensured that the voltage voltage higher than the second input port 107 of first input port 106.
When output end voltage V1 sets up and is under normal operating conditions, the voltage that the voltage of first input port 106 is corresponding more than the high level that the first input high level signal circuit 202 exports, and then diode 309 ends, first input high level signal circuit 202 does not work, in like manner, diode 305 ends, and the second input high level signal circuit 203 does not work.
After output end voltage V1 sets up; if the voltage of output voltage terminal V1 reduces; then the voltage of first input port 106 can reduce; effect due to source of stable pressure 101; the voltage of the second input port 107 remains unchanged, and when the voltage of first input port 106 is lower than the voltage of the second input port 107, illustrates that the voltage of output voltage terminal V1 is no longer in normal range of operation voltage range; first output port 317 can export high level, and then triggers under-voltage protecting circuit. If the voltage of output voltage terminal V1 raises; then the voltage of the 4th output port 108 can raise; effect due to source of stable pressure 101; the voltage of the 3rd input port 109 remains unchanged; when the voltage of the 4th output port 108 is higher than the voltage of the 3rd input port 109; illustrate that the voltage of output voltage terminal V1 is no longer in normal range of operation voltage range, triggers overvoltage crowbar.
Embodiment four
The present embodiment also provides for a kind of terminal, and this terminal can be the various terminals such as TV, IPad, smart machine.
The terminal of the present embodiment includes the on-off circuit of the protection circuit of above-mentioned any embodiment, also includes the under-voltage protecting circuit in above-mentioned any embodiment and overvoltage crowbar, and the first comparator connects under-voltage protecting circuit, and the second comparator connects overvoltage crowbar.
Terminal according to the present embodiment; there is provided reference voltage as comparing voltage by arranging source of stable pressure for comparator element; make comparator element when voltage output end normal operation again through bleeder circuit; comparator element will not trigger protection circuit; and when voltage output end non-normal working; comparator element trigger protection circuit, and then reach to protect the purpose of the equipment of being powered.
Last it is noted that above example is only in order to illustrate technical scheme, it is not intended to limit; Although the present invention being described in detail with reference to previous embodiment, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein portion of techniques feature is carried out equivalent replacement; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (14)
1. the on-off circuit protecting circuit, it is characterised in that including:
Voltage output end;
Source of stable pressure, the input of described source of stable pressure is connected with described voltage output end;
Bleeder circuit, is connected with described voltage output end;
Comparator element; it is connected with the outfan of the outfan of described source of stable pressure and described bleeder circuit respectively; described comparator element is configured to the output voltage of source of stable pressure described in comparison and the output voltage of described bleeder circuit, and determines whether to trigger described protection circuit.
2. on-off circuit according to claim 1, it is characterised in that
Described comparator element is provided with first input port and the second input port, described first input port connects described bleeder circuit, described second input port connects described source of stable pressure, when the voltage of described voltage output end is in normal range of operation, the voltage of described first input port is more than the voltage of described second input port;
Described on-off circuit also includes:
First input high level signal circuit, is connected with power supply and described first input port respectively, and described first input high level signal circuit is used for when described power supply powers on described first input port input high level signal.
3. on-off circuit according to claim 1, it is characterised in that
Described comparator element is provided with the 3rd input port and four-input terminal mouth, described 3rd input port connects described source of stable pressure, described four-input terminal mouth connects described bleeder circuit, when the voltage of described voltage output end is in normal range of operation, the voltage of described 3rd input port is more than the voltage of described four-input terminal mouth;
Described on-off circuit also includes:
Second input high level signal circuit, is connected with the 3rd input port of power supply and described comparator element respectively, and described second input high level signal circuit is used for when described power supply powers on described 3rd input port input high level signal.
4. on-off circuit according to claim 1, it is characterized in that, described comparator element includes the first comparator and the second comparator, and described first comparator is provided with first input port and the second input port, and described second comparator is provided with the 3rd input port and four-input terminal mouth; Described first input port is connected with described bleeder circuit, and described second input port is connected with described source of stable pressure, and described 3rd input port connects described source of stable pressure, and described four-input terminal mouth connects described bleeder circuit, and described on-off circuit also includes:
First input high level signal circuit, is connected with the first input port of power supply and described comparator element respectively, and described first input high level signal circuit is used for when described power supply powers on described first input port input high level signal;
Second input high level signal circuit, is connected with the 3rd input port of power supply and described comparator element respectively, and described second input high level signal circuit is used for when described power supply powers on described 3rd input port high level signal;
Wherein, when the voltage of described voltage output end is in normal range of operation, the voltage of described first input port is more than the voltage of described second input port, and the voltage of described 3rd input port is more than the voltage of described four-input terminal mouth.
5. the on-off circuit according to claim 2 or 4, it is characterized in that, described first input high level signal circuit includes the first diode, the second resistance and the 4th electric capacity, first end of described second resistance connects described power supply, second end of described second resistance connects the positive terminal of described first diode, the negative pole end of described first diode connects described first input port and described bleeder circuit, first end of described 4th electric capacity connects the first end of described second resistance, the second end ground connection of described 4th electric capacity.
6. the on-off circuit according to claim 3 or 4, it is characterized in that, described second input high level signal circuit includes the 4th resistance, the second diode and the 3rd resistance, first end of described 4th resistance connects described power supply, second end of described 4th resistance is connected with the positive terminal of described second diode, the negative pole end of described second diode is connected with the first end of described 3rd resistance, second end ground connection of described 3rd resistance, described 3rd input port is connected between described second diode and described 3rd resistance.
7. the on-off circuit according to any one of claim 1-4, it is characterised in that also include:
First delay circuit, is connected with described source of stable pressure, for the input voltage of described source of stable pressure is carried out delay process.
8. on-off circuit according to claim 7, it is characterized in that, described first delay circuit includes the first resistance, the first electric capacity and the second electric capacity, first end of described first resistance and the first end of the first electric capacity connect, second end of described first resistance is connected to the negative pole end of described source of stable pressure, second end of described first electric capacity is connected to the positive terminal of described source of stable pressure, first end of described second electric capacity is connected to the negative pole end of described source of stable pressure, second end of described second electric capacity is connected to the positive terminal of described source of stable pressure, the positive terminal ground connection of described source of stable pressure.
9. on-off circuit according to claim 1, it is characterised in that described on-off circuit also includes the second delay circuit, is connected with described second input port, and described second delay circuit is for carrying out delay process to the input voltage of described second input port.
10. on-off circuit according to claim 9, it is characterized in that, described second delay circuit includes the 3rd electric capacity and the 5th resistance, first end of described 3rd electric capacity and the first end of described 5th resistance are connected to described second input port, the second end of described 3rd electric capacity and the second equal ground connection of end of described 5th resistance.
11. on-off circuit according to claim 1, it is characterized in that, described bleeder circuit includes the 6th resistance, 7th resistance, 8th resistance and the 9th resistance, first end of described 6th resistance and the first end of described 8th resistance are all connected with described voltage output end, second end of described 6th resistance is connected with the first end of described 7th resistance, second end ground connection of described 7th resistance, second end of described 8th resistance is connected with the first end of described 9th resistance, second end ground connection of described 9th resistance, described four-input terminal mouth is connected between described 8th resistance and described 9th resistance, described first output port is connected between described 6th resistance and described 7th resistance.
12. on-off circuit according to claim 1, it is characterized in that, it is provided with the 4th diode between first output port and the described under-voltage protecting circuit of described first comparator, the positive terminal of described 4th diode connects described first output port, the negative pole end of described 4th diode connects described under-voltage protecting circuit, it is provided with the 3rd diode between second output port and the described overvoltage crowbar of described second comparator, the positive terminal of described 3rd diode connects described second output port, the negative pole end of described 3rd diode connects described overvoltage crowbar.
13. on-off circuit according to claim 1, it is characterised in that described source of stable pressure is TL431 source of stable pressure.
14. a terminal; it is characterized in that, including the on-off circuit according to any one of claim 1-13, also include under-voltage protecting circuit and overvoltage crowbar; described first comparator connects described under-voltage protecting circuit, and described second comparator connects described overvoltage crowbar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610079380.1A CN105633904B (en) | 2016-02-04 | 2016-02-04 | Protect the switching circuit and terminal of circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610079380.1A CN105633904B (en) | 2016-02-04 | 2016-02-04 | Protect the switching circuit and terminal of circuit |
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| CN105633904A true CN105633904A (en) | 2016-06-01 |
| CN105633904B CN105633904B (en) | 2019-01-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111106817A (en) * | 2018-10-09 | 2020-05-05 | 中车株洲电力机车研究所有限公司 | Signal delay circuit |
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| CN103683184A (en) * | 2012-08-31 | 2014-03-26 | 西门子公司 | Undervoltage-overvoltage protection device and method |
| JP2014199726A (en) * | 2013-03-29 | 2014-10-23 | パナソニック株式会社 | Undervoltage tripper for circuit breaker and overvoltage/undervoltage tripper |
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| CN201349121Y (en) * | 2008-12-29 | 2009-11-18 | 深圳市同洲电子股份有限公司 | Direct current input overvoltage and under-voltage protection circuit |
| CN201584745U (en) * | 2009-12-21 | 2010-09-15 | 无锡华阳科技有限公司 | Overvoltage and undervoltage protection device with function of time delay |
| CN103683184A (en) * | 2012-08-31 | 2014-03-26 | 西门子公司 | Undervoltage-overvoltage protection device and method |
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| CN111106817A (en) * | 2018-10-09 | 2020-05-05 | 中车株洲电力机车研究所有限公司 | Signal delay circuit |
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| CN105633904B (en) | 2019-01-29 |
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Address after: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee after: Hisense Visual Technology Co., Ltd. Address before: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee before: QINGDAO HISENSE ELECTRONICS Co.,Ltd. |