CN212463590U - Indicating lamp - Google Patents
Indicating lamp Download PDFInfo
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- CN212463590U CN212463590U CN202021352966.9U CN202021352966U CN212463590U CN 212463590 U CN212463590 U CN 212463590U CN 202021352966 U CN202021352966 U CN 202021352966U CN 212463590 U CN212463590 U CN 212463590U
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Abstract
The utility model relates to an indicator lamp belongs to electric power system pilot lamp field. The lamp comprises a power supply port and a lamp bead, and further comprises a detection circuit for detecting the voltage and/or current of the power supply port, and a bypass circuit for being switched on when the voltage and/or current of the power supply port does not exceed a set threshold value, wherein the bypass circuit is connected with the lamp bead in parallel. The utility model discloses can take the initiative bypass pilot lamp when the circuit receives the induced voltage that the interference production is less than the settlement threshold value, avoid the pilot lamp mistake to light, disturb the grasp of fortune dimension personnel to equipment running state.
Description
Technical Field
The utility model relates to an indicator lamp belongs to electric power system pilot lamp field.
Background
An internal circuit of an existing indicator lamp is shown in fig. 1, the indicator lamp is composed of a shell, a lampshade, a voltage-dividing resistor R1, an LED lamp bead (light-emitting diode) D2, a protection diode D and the like, one end of the voltage-dividing resistor R1 is connected with one terminal A of an indicator lamp power supply, the other end of the voltage-dividing resistor R1 is connected with the LED lamp bead (light-emitting diode) D2, the other end of the LED lamp bead (light-emitting diode) D2 is connected with the other terminal B of the indicator lamp power supply, and the protection diode D is reversely connected in parallel on the LED lamp bead (light-emitting diode). The indicating lamp power supply is connected with the corresponding indicating lamp control line for outputting the indicating signal, can be used for indicating the running state or the signal state of equipment and the like, and when the control line outputs rated voltage or current, the indicating lamp is lightened to correspondingly indicate the corresponding equipment or the signal state.
The LED indicator lamp has the problem of low-voltage and low-current lighting, namely when the control line does not output rated voltage or current and the indicator lamp should not be lighted, the low-voltage and low-current generated in the control line due to other reasons causes the signal lamp to be lighted. For example, as shown in fig. 2, when the indicator light is used in a remote duty room to indicate an operation state on an ac control cabinet of a large-scale substation or an operation state of power equipment of a large-scale factory, because the equipment site is far away from a monitoring room, there are situations where a plurality of indicator light cables and a plurality of control operation cables are located on the same cable bridge, when the switchgear is close to the monitoring room, an induced voltage is also over 30V, when the switchgear is far away from the monitoring room, the induced voltage can even reach over 70V, especially in severe weather such as heavy rainy days, and the like, due to rain and wind fluctuation of the cables, the induced voltage is suddenly high and low, and the indicator light of which the control line does not reach the rated voltage and is not suddenly turned on and emits light, which seriously interferes with normal judgment of an operator on the operation state.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an indicator lamp for solve current indicator lamp and easily receive the interference and the problem that the mistake was lighted.
In order to achieve the above object, the utility model discloses a scheme includes:
the utility model discloses an indicator lamp, including power supply port and lamp pearl, still including the detection circuitry who is used for detecting power supply port voltage and/or electric current to and be used for the bypass circuit of switch-on when power supply port voltage and/or electric current do not surpass the settlement threshold value, bypass circuit is parallelly connected with the lamp pearl.
The utility model discloses can take the initiative bypass pilot lamp when the circuit receives the induced voltage that the interference production is less than the settlement threshold value, avoid the pilot lamp mistake to light, disturb the grasp of fortune dimension personnel to equipment running state.
Further, the detection circuit comprises a voltage relay coil connected with the lamp bead in parallel, and the bypass circuit comprises a normally closed contact of the voltage relay.
Further, the detection circuit comprises a current relay coil connected with the lamp bead in series, and the bypass circuit comprises a normally closed contact of the current relay.
The relay is used for judging the voltage or current in the circuit so as to distinguish whether the voltage or current in the circuit is a real signal sent by equipment state change or a false signal generated by interference induction, and when the voltage or current is the false signal, the relay does not act and bypasses a lamp bead through a normally closed contact of the relay, so that an indicator lamp is prevented from being turned on by mistake; when the signal is a real signal, the relay acts, the normally closed contact is disconnected, the indicator lamp is normally lightened, and the state of the equipment is accurately indicated. The circuit is simple and reliable, and the cost is lower.
Furthermore, a rectifier diode is further connected in series on the power supply port, and a filter capacitor is further connected in parallel on the lamp bead.
The indicator light is prevented from flickering when the indicator light is lightened, so that the light of the indicator light is stable and uniform, and the lightening quality and effect of the indicator light are improved.
Furthermore, the detection circuit comprises a sampling resistor, the bypass circuit comprises a triode, the control end of the triode is connected with the sampling resistor in parallel, and the controlled end of the triode is connected with the lamp bead in parallel.
Adopt silicon controlled rectifier element to realize the utility model discloses a circuit makes the littleer integration of circuit volume on the circuit board, reduces the volume of pilot lamp.
Furthermore, the detection circuit comprises a first voltage dividing resistor and a second voltage dividing resistor, and the sampling resistor is connected in series with the voltage stabilizing diode and then connected in parallel with the second voltage dividing resistor.
Further, the bypass circuit comprises a PNP type triode, an emitter junction of the PNP type triode is connected with the sampling resistor in parallel, and the collector electrode and the emitter electrode of the PNP type triode are connected with the lamp bead in parallel.
Furthermore, the bypass circuit comprises a first NPN triode and a second NPN triode, the emitter junction of the first NPN triode is connected with the sampling resistor in parallel, the emitter junction of the second NPN triode is connected between the collector electrode and the emitter electrode of the first NPN triode in parallel, and the lamp bead is connected between the collector electrode and the emitter electrode of the second NPN triode in parallel.
Further, a filter capacitor is connected in parallel to the second voltage-dividing resistor.
The accuracy of sampling the voltage of the sampling resistor is improved, and the misoperation of the circuit is prevented.
Furthermore, a rectifier diode is further connected in series on the power supply port, and a filter capacitor is further connected in parallel on the lamp bead.
The indicator light is prevented from flickering when the indicator light is lightened, so that the light of the indicator light is stable and uniform, and the lightening quality and effect of the indicator light are improved.
Drawings
FIG. 1 is a schematic diagram of a prior art LED indicator lamp circuit;
FIG. 2 is a schematic view of an environment in which the indicator light is used;
fig. 3 is a schematic circuit diagram of embodiment 1 of the present invention;
fig. 4 is a schematic circuit diagram of embodiment 2 of the present invention;
fig. 5 is a schematic circuit diagram according to embodiment 3 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1:
the circuit principle of the indicator light is shown in fig. 3, the light emitting device of the indicator light can be an LED, and certainly, other light emitting devices can be adopted, and the LED indicator light is specifically composed of a shell, an LED lamp bead, a power supply circuit and the like. The indicator lamp circuit schematic diagram comprises a power supply circuit and an LED lamp bead (light emitting diode D2), wherein the power supply circuit is provided with a signal input end (or a power supply port comprising a terminal A, B) for inputting a lighting signal, the LED lamp bead (light emitting diode D2) is connected between a terminal A and a terminal B of the signal input end, and the signal input end is also connected with a control line of the indicator lamp and is connected with corresponding indicated equipment and the like through the control line.
The power supply loop also comprises a voltage relay coil KV which is connected with the signal input end in parallel and is used as a detection circuit, and a voltage relay normally-closed contact KV1 which is connected with the LED lamp bead (light-emitting diode D2) in parallel and is used as a bypass circuit. And shunt resistors R1 and R2, the connection positions of which are shown in fig. 3.
Under the cooperation of the shunt resistors R1 and R2, the input voltage at the signal input end (the voltage input to the power supply circuit by the control line) capable of triggering the voltage relay to operate is a preset threshold voltage, and the threshold voltage should be equal to or slightly less than the rated lighting voltage at the signal input end when the indicator lamp is normally lighted (the rated lighting voltage is, for example, the voltage output to the signal input end of the power supply circuit through the control line when the indicator lamp needs to be lighted by switching the indicated device state). The coil KV of the voltage relay is used as a detection circuit to detect the voltage of the power supply loop, namely the voltage of the signal input end of the power supply loop inputted by the control line. When the voltage of the power supply loop is zero or lower than the threshold voltage, the indicator light is in a state of not being lightened, and the voltage which is input into the power supply loop by the control line and is larger than zero and smaller than the threshold voltage is the interference voltage generated by induction. Because the action voltage of the voltage relay is not reached, the normally closed contact KV1 of the voltage relay serving as the bypass circuit keeps a closed state, the bypass circuit is conducted to bypass the LED lamp bead (the light-emitting diode D2), and the LED lamp bead (the light-emitting diode D2) cannot be lightened under the interference voltage lower than the threshold value, so that the judgment of operation and maintenance personnel on the running state of the equipment is avoided being influenced by mistaken lightening or neglected lightening.
When the indicated equipment outputs rated lighting voltage, the voltage acting on the coil KV is larger than or equal to the trigger voltage of the voltage relay, the voltage relay acts, the normally closed contact KV1 acts to be disconnected, the bypass circuit is opened, current flows through the LED lamp bead (the light-emitting diode D2) to enable the LED lamp bead to be correctly lighted, and the indicator lamp accurately reflects the equipment state.
As another embodiment, in order to improve the lighting quality of the indicator light, the LED lamp bead (light emitting diode D2) is further connected in parallel with the filter capacitor C, and a certain terminal of the signal input terminal is further connected in series with a rectifier diode D1 connected in the same direction as the LED lamp bead (light emitting diode D2).
The rated voltage of the 220V light emitting diode D2 used as an LED lamp bead may be set to 180V.
The voltage relay can be a miniature direct current relay with the working voltage of 6V to 12V, so that the relay is placed in a shell of the LED lamp.
Example 2:
the present embodiment is different from embodiment 1 in that the present embodiment employs a current relay instead of the voltage relay in embodiment 1. As shown in fig. 4, in this embodiment, the power supply circuit includes a current relay coil KA and a voltage dividing resistor R1 as a detection circuit connected in series with the LED lamp bead (light emitting diode D2), and a current relay normally closed contact KA1 as a bypass circuit connected in parallel with the LED lamp bead (light emitting diode D2).
The trigger current of the current relay is a preset threshold current, and the threshold current should be equal to or slightly less than a rated lighting current when the indicator lamp is normally lighted (the rated lighting voltage refers to, for example, a current output to the signal input end of the power supply loop through the control line when the indicated equipment state is switched and the indicator lamp needs to be lighted). The coil KA of the current relay is used as a detection circuit for detecting the current of the power supply loop, namely the current of the signal input end of the power supply loop inputted by the control line. When the current of the power supply loop is zero or lower than the threshold current, the indicator light is in a state of not being lightened, and the current which is input into the power supply loop by the control line and is larger than zero and smaller than the threshold current is the interference current generated by induction. This interference current is because of not reaching the action current of current relay, and normally closed contact KA1 of current relay as bypass circuit keeps the closed state, and bypass circuit switches on LED lamp pearl (emitting diode D2) bypass, and LED lamp pearl (emitting diode D2) can not lighted under the interference current that is less than the threshold value, has avoided the mistake to light or neglected and neglected to influence the judgement of fortune dimension personnel to equipment running state.
When the indicated equipment outputs rated lighting current which is larger than or equal to the trigger current of the current relay, the current relay acts, the normally closed contact KA1 acts to be disconnected, the bypass circuit is opened, the rated lighting current flows through the LED lamp bead (the light emitting diode D2) to enable the LED lamp bead to be correctly lighted, and the indicator lamp accurately reflects the equipment state.
As another embodiment, in order to improve the lighting quality of the indicator light, the LED lamp bead (light emitting diode D2) is further connected in parallel with the filter capacitor C, and a certain terminal of the signal input terminal is further connected in series with a rectifier diode D1 connected in the same direction as the LED lamp bead (light emitting diode D2).
The rated lighting current of the 220V light emitting diode D2 used as an LED lamp bead may be set to 10 mA.
The current relay can be a miniature direct current relay with working voltage of 6V to 12V, so that the relay is placed in a shell of the LED lamp.
Example 3:
the present embodiment provides an implementation that does not employ relays as the detection circuit and the bypass circuit.
As shown in fig. 5, the light emitting device of the indicator lamp of this embodiment may be an LED, or may be other light emitting devices, and the LED indicator lamp specifically includes a housing, an LED lamp bead, and a power supply circuit. The indicator lamp circuit schematic diagram comprises a power supply circuit and an LED lamp bead (light emitting diode D2), wherein the power supply circuit is provided with a signal input end (or a power supply port comprising a terminal A, B) for inputting a lighting signal, the LED lamp bead (light emitting diode D2) is connected between a terminal A and a terminal B of the signal input end, and the signal input end is also connected with a control line of the indicator lamp and is connected with corresponding indicated equipment and the like through the control line.
The power supply loop further comprises a sampling resistor group connected in parallel to the signal input end and used as a detection circuit, wherein the sampling resistor group comprises two voltage division resistors R3 and R4 which are connected in series and a sampling resistor R5, and the sampling resistor R5 is connected in series with a voltage stabilizing diode D3 and then connected in parallel to the voltage division resistor R4. The bypass circuit adopts a triode circuit, the triode circuit in the embodiment comprises two NPN type triodes Q1 and Q2, an emitter junction (a PN junction between a base electrode and an emitting electrode of the triode and also called a control end of the triode) of a triode Q1 is connected in parallel with the sampling resistor R5, an emitter junction (namely a collector electrode of a triode Q1 is connected with a base electrode of the triode Q2, an emitting electrode of the triode Q1 is connected with an emitting electrode of the triode Q2 and a controlled end of the triode) of a triode Q2 is connected in parallel between a collector electrode and an emitting electrode of the triode Q1, and an LED lamp bead is connected in parallel between the collector electrode and the emitting electrode of the triode Q2 (namely one end of a light emitting diode D2 serving as the LED lamp bead is connected with the collector electrode of the triode Q2 and the. The specific circuit is shown in fig. 5.
When the transistor Q1 is turned on, the voltage at the signal input terminal is the threshold voltage (when the voltage at the sampling resistor R5 meets the conduction voltage drop of the transistor Q1, the transistor is turned on), and the resistance values of the voltage dividing resistors R4, R5 and the sampling resistor R5 are set to meet the requirement that the threshold voltage is equal to or less than the rated lighting voltage at the signal input terminal when the indicator lamp is normally lit (the meaning of the rated lighting voltage is the same as that in embodiment 1, and details are not repeated in this embodiment). When the voltage input to the signal input end of the power supply loop by the control line is lower than the threshold voltage, the voltage at the moment is judged to be induced voltage generated by interference, the voltage obtained by dividing the sampling resistor R5 is lower than the conduction voltage of the triode Q1, the triode Q1 is in a cut-off state, and the high-resistance state is presented between the collector and the emitter of the triode Q1, so that larger voltage is obtained, the large voltage is added to the emitter junction of the triode Q2 to sufficiently conduct the triode Q2, and the LED lamp bead (the light-emitting diode D2) is bypassed after the conduction between the collector and the emitter of the triode Q2, so that the indicator lamp cannot be lightened under the interference voltage lower than the threshold, and the phenomenon that the judgment of operation and maintenance personnel on the running state of the equipment is influenced by mistaken lightening or neglecting.
When the indicated equipment outputs rated lighting voltage, the voltage divided by the sampling resistor R5 is equal to or greater than the conduction voltage of the triode Q1, the triode Q1 is conducted, the resistance value between the collector and the emitter of the triode Q1 is very low, so the voltage is very low, the voltage cannot conduct the triode Q2, the collector and the emitter of the triode Q2 are disconnected, the current flows through the LED lamp bead (the light-emitting diode D2) to be correctly lighted, and the indicator lamp accurately reflects the equipment state.
In other embodiments, the sampling resistor R5 and the zener diode D3 may be eliminated from the sampling resistor group, and the emitter junction of the transistor Q1 is directly connected in parallel to the voltage dividing resistor R4 or R3. The resistances of the divider resistors R3 and R4 are set to make the transistor Q1 conduct, and the voltage at the signal input terminal is equal to or greater than the rated lighting voltage, so that the working principle of the indicator light circuit is similar to that before the sampling resistor R5 and the zener diode D3 are cancelled, and details are not repeated here.
As another embodiment, the triode circuit as the bypass circuit may also adopt a PNP type triode, an emitter junction of the PNP type triode is connected in parallel to the sampling resistor R5, and an LED lamp bead (light emitting diode D2) is connected in parallel between a collector and an emitter of the PNP type triode. In this embodiment, the voltage at the signal input terminal when the PNP transistor is turned off is the threshold voltage (when the voltage across the sampling resistor R5 meets the turn-off voltage drop of the PNP transistor, the transistor is turned off), and the resistance values of the voltage dividing resistors R4, R5 and the sampling resistor R5 should meet the condition that the threshold voltage is equal to or slightly less than the rated lighting voltage at the signal input terminal when the indicator lamp is normally lit. When the voltage input to the signal input end of the power supply loop by the control line is lower than the threshold voltage, the voltage at the moment is judged to be induced voltage generated by interference, the voltage obtained by the sampling resistor R5 is lower than the turn-off voltage of the PNP type triode at the moment, the PNP type triode is kept in a conducting state, and the collector electrode and the emitter electrode of the PNP type triode are conducted to bypass the LED lamp bead (the light-emitting diode D2), so that the indicator lamp cannot be lightened under the interference voltage lower than the threshold value, and the phenomenon that the judgment of the running state of the equipment is influenced by mistakenly lightening or neglecting is avoided.
When the indicated equipment outputs rated lighting voltage, the voltage divided by the sampling resistor R5 is equal to or greater than the turn-off voltage of the PNP type triode, the PNP type triode is cut off, the collector and the emitter of the PNP type triode are disconnected, current flows through the LED lamp bead (the light-emitting diode D2) to enable the PNP type triode to be correctly lighted, and the indicator lamp accurately reflects the equipment state.
As another embodiment, in order to improve the accuracy of resistance sampling, a filter capacitor C is also connected in parallel to the voltage dividing resistor R4 in the sampling resistor group; in order to improve the lighting quality of the indicator lamp, the LED lamp bead (the light emitting diode D2) is also connected with a filter capacitor C1 in parallel, and a certain terminal of the signal input end is also connected with a rectifier diode D1 in series, wherein the rectifier diode D1 is connected with the LED lamp bead (the light emitting diode D2) in the same direction.
Claims (10)
1. The indicator lamp comprises a power supply port and a lamp bead, and is characterized by further comprising a detection circuit for detecting voltage and/or current of the power supply port and a bypass circuit for being switched on when the voltage and/or current of the power supply port does not exceed a set threshold value, wherein the bypass circuit is connected with the lamp bead in parallel.
2. The indicator lamp of claim 1 wherein the detection circuit comprises a voltage relay coil in parallel with the lamp bead, and the bypass circuit comprises a normally closed contact of the voltage relay.
3. The indicator lamp of claim 1 wherein the detection circuit comprises a current relay coil in series with the lamp bead, and the bypass circuit comprises a normally closed contact of the current relay.
4. The indicator lamp according to claim 2 or 3, wherein a rectifier diode is further connected in series to the power supply port, and a filter capacitor is further connected in parallel to the lamp bead.
5. The indicator lamp of claim 1, wherein the detection circuit comprises a sampling resistor, the bypass circuit comprises a transistor, a control terminal of the transistor is connected in parallel with the sampling resistor, and a controlled terminal of the transistor is connected in parallel with the lamp bead.
6. The indicator lamp of claim 5, wherein the detection circuit comprises a first voltage dividing resistor and a second voltage dividing resistor, and the sampling resistor is connected in series with a voltage stabilizing diode and then connected in parallel with the second voltage dividing resistor.
7. The indicator lamp according to claim 5, wherein the bypass circuit comprises a PNP type triode, an emitter junction of the PNP type triode is connected with the sampling resistor in parallel, and the lamp bead is connected between a collector electrode and an emitter electrode of the PNP type triode in parallel.
8. The indicator lamp according to claim 5, wherein the bypass circuit comprises a first NPN triode and a second NPN triode, an emitter junction of the first NPN triode is connected with the sampling resistor in parallel, an emitter junction of the second NPN triode is connected between a collector electrode and an emitter electrode of the first NPN triode in parallel, and the lamp bead is connected between a collector electrode and an emitter electrode of the second NPN triode in parallel.
9. The indicator lamp of claim 6, wherein a filter capacitor is connected in parallel to the second voltage dividing resistor.
10. The indicator lamp according to claim 9, wherein a rectifier diode is further connected in series to the power supply port, and a filter capacitor is further connected in parallel to the lamp bead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021352966.9U CN212463590U (en) | 2020-07-10 | 2020-07-10 | Indicating lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021352966.9U CN212463590U (en) | 2020-07-10 | 2020-07-10 | Indicating lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212463590U true CN212463590U (en) | 2021-02-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021352966.9U Active CN212463590U (en) | 2020-07-10 | 2020-07-10 | Indicating lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212463590U (en) |
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2020
- 2020-07-10 CN CN202021352966.9U patent/CN212463590U/en active Active
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