CN216387327U - Voltage loss detection circuit for power supply of relay protection product - Google Patents
Voltage loss detection circuit for power supply of relay protection product Download PDFInfo
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- CN216387327U CN216387327U CN202122365583.6U CN202122365583U CN216387327U CN 216387327 U CN216387327 U CN 216387327U CN 202122365583 U CN202122365583 U CN 202122365583U CN 216387327 U CN216387327 U CN 216387327U
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Abstract
The utility model discloses a power supply voltage loss detection circuit of a relay protection product, which comprises a V1 electrified indicating unit, a V1 starting unit, a first voltage stabilizer, a V2 electrified indicating unit, a V2 starting unit and a switch unit, wherein the first voltage stabilizer is arranged on the power supply voltage loss detection circuit; the V1 live indicating unit and the V1 starting unit are connected to a first path voltage V1 of a power supply; the V2 charged indicating unit, the V2 starting unit and the switch unit are connected to a second path voltage V2 of a power supply; the first pole of the first voltage stabilizer is connected to a first path voltage V1 of the power supply, and the second pole of the first voltage stabilizer is connected to a second path voltage V2 of the power supply; the first voltage stabilizer adopts an optical coupler U1. The utility model can realize accurate detection of the voltage loss of the power supply of the relay protection product, thereby achieving the purpose of improving the stability and reliability of the operation of the product.
Description
Technical Field
The utility model relates to the technical field of relay protection of power systems, in particular to a power supply voltage loss detection circuit of a relay protection product.
Background
Along with the rapid development of power grid construction, the requirement on the stability of the operation of a relay protection product is higher and higher, the reliability and the accurate detection of a power supply of the product play a crucial role in the operation of the whole product, if the power supply of the relay protection product is abnormal in operation or has a voltage loss problem, the operation of the relay protection product can be directly influenced, and further the reliability and the stability of the relay protection function of the power grid are related. The scheme that power supply voltage is applied to two ends of a relay coil is directly adopted in a power supply detection circuit of an existing relay protection product, and discrete types of action voltage and return voltage of a relay are large, so that unstable factors exist in power supply detection, meanwhile, the relay protection product usually adopts two power supplies, a product designer usually only detects one power supply loop, the two power supplies are not connected together, and accurate detection is carried out on the two power supplies.
The scheme of a power supply detection circuit (shown in figure 2) of the existing relay protection product is that the output voltage of a power supply is directly connected to two ends of a relay coil, the voltage output by the power supply directly drives a relay to act, the discrete type of a relay starting voltage value and a return voltage value is large, and when the voltage value of the power supply is low (the discrete type of the relay starting voltage value is large and some starting values are low), a voltage-loss signal is rejected, so that whether the voltage value output by the power supply meets the voltage value required by the relay protection product or not can not be reliably and accurately detected. Meanwhile, the existing scheme is poor in unicity or integration of power detection, multiple power detection circuits adopt multiple identical loops, and multiple power sources cannot be accurately detected in the simplest and lowest-cost mode.
SUMMERY OF THE UTILITY MODEL
In view of this, an object of the embodiments of the present invention is to provide a power supply voltage loss detection circuit for a relay protection product, which can implement accurate detection of power supply voltage loss of the relay protection product, so as to achieve the purpose of improving stability and reliability of product operation.
A power supply voltage loss detection circuit of a relay protection product comprises a V1 electrified indication unit, a V1 starting unit, a first voltage stabilizer, a V2 electrified indication unit, a V2 starting unit and a switch unit.
The V1 live indicating unit and the V1 starting unit are connected to a first path voltage V1 of a power supply.
The V2 charged indication unit, the V2 starting unit and the switch unit are connected to a second path voltage V2 of the power supply.
The first pole of the first voltage stabilizer is connected to the first path voltage V1 of the power supply, and the second pole is connected to the second path voltage V2 of the power supply.
The first voltage stabilizer adopts an optical coupler U1.
In a preferred embodiment of the present invention, the V1 starting unit of the power loss detection circuit of the relay protection product includes a second regulator U2, a first resistor R1, a third resistor R3, and a fourth resistor R4.
The first pin of the second voltage regulator U2 is connected to the positive electrode of the first path voltage V1 through a first resistor R1.
And a third pin of the second voltage stabilizer U2 is connected with the negative pole of the first path voltage V1.
The third resistor R3 and the fourth resistor R4 are connected in series and then connected between the positive pole and the negative pole of the first path voltage V1.
The second pin of the second regulator U2 is connected to a node between the third resistor R3 and the fourth resistor R4.
The technical effects are as follows: the V1 starting unit is used for starting an action end of a first voltage stabilizer (an optical coupler U1)
In a preferred embodiment of the present invention, the V1 starting unit of the power supply voltage loss detection circuit of the relay protection product further includes a current limiting resistor R9.
The current limiting resistor R9 is connected between the positive pole and the negative pole of the first path voltage V1.
The technical effects are as follows: the current limiting resistor R9 is used to regulate the current limiting effect.
In a preferred embodiment of the present invention, the V1 indicating unit of the power loss detection circuit for relay protection products includes a second resistor R2 and a first diode LED 1.
The second resistor R2 and the first diode LED1 are connected in series and then connected between the positive pole and the negative pole of the first path voltage V1.
In a preferred embodiment of the present invention, the V2 starting unit of the power loss detection circuit of the relay protection product includes a third regulator U3, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7.
The first pin of the third voltage stabilizer U3 is connected to the anode of the second path voltage V2 through a fifth resistor R5.
And a third pin of the third voltage stabilizer U3 is connected with the negative electrode of the second path of voltage V2.
The sixth resistor R6 and the seventh resistor R7 are connected in series and then connected with the negative electrode of the second path of voltage V2.
The second pin of the third regulator U3 is connected to a node between the sixth resistor R6 and the seventh resistor R7.
In a preferred embodiment of the present invention, the V2 starting unit of the power supply voltage loss detection circuit of the relay protection product further includes a current limiting resistor R10.
The current limiting resistor R10 is connected between the anode and the cathode of the second path voltage V2.
In a preferred embodiment of the present invention, the V2 indicating unit of the power loss detection circuit for relay protection products includes an eighth resistor R8 and a second diode LED 2.
The eighth resistor R8 and the second diode LED2 are connected in series and then connected between the positive pole and the negative pole of the second path voltage V2.
In a preferred embodiment of the present invention, the switch unit of the power loss detection circuit of the relay protection product includes a triode and a relay.
The triode is an NPN triode.
And the emitter of the NPN triode Q1 is connected with the relay.
In a preferred embodiment of the present invention, the power supply voltage loss detection circuit of the relay protection product further includes a U1 voltage stabilization unit.
The U1 voltage regulation unit comprises a first capacitor C1.
The positive plate of the first capacitor C1 is connected with the anode of the diode of the optocoupler U1.
The negative plate of the first capacitor C1 is connected with the diode negative electrode of the optocoupler U1.
The technical effects are as follows: the U1 voltage stabilizing unit is used for stabilizing and filtering the action voltage of the emitting electrode of the optical coupler U1.
In a preferred embodiment of the present invention, the power supply voltage loss detection circuit of the relay protection product further includes a triode voltage stabilization unit.
The triode voltage stabilizing unit comprises a capacitor C2.
The positive plate of the second capacitor C2 is connected with the base of the NPN triode Q1.
The negative plate of the second capacitor C2 is connected with the negative electrode of the second path voltage V2.
The embodiment of the utility model has the beneficial effects that:
the utility model can simultaneously detect two paths of power supplies used by a relay protection product, has the function of setting a detection voltage threshold, and is suitable for output detection of power supplies with different voltage grades; and the detection of two paths of power supplies can be realized by using one loop. The problem that the discreteness of a power supply voltage value detection circuit of an existing relay protection product is large, the power supply detection circuit is unstable, the stability and the reliability of product operation are directly affected, and meanwhile, the effects of preventing a power loss signal of the power supply detection circuit from being mistakenly exported and refusing to be exported are effectively achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of a power supply voltage loss detection circuit of a relay protection product according to the present invention;
fig. 2 is a schematic diagram of a power supply voltage detection circuit of a conventional relay protection product.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein can be arranged and designed in a wide variety of different configurations.
Referring to fig. 1, an embodiment of the utility model provides a power supply voltage loss detection circuit for a relay protection product, which includes a V1 live indication unit, a V1 starting unit, a first voltage regulator, a V2 live indication unit, a V2 starting unit, and a switch unit.
The V1 live indicating unit and the V1 starting unit are connected to a first path voltage V1 of a power supply.
The V2 charged indication unit, the V2 starting unit and the switch unit are connected to a second path voltage V2 of the power supply.
The first pole of the first voltage stabilizer is connected to the first path voltage V1 of the power supply, and the second pole is connected to the second path voltage V2 of the power supply.
The first voltage stabilizer adopts an optical coupler U1.
The relay protection product power supply uses two paths of voltage, the first path of voltage V1 is used for supplying power to a product chip and a data processing and logic control circuit, the second path of voltage V2 is used for supplying power to a product outlet relay, the voltage values of V1 and V2 are different in the using process, the voltage value of V2 is higher than the voltage value of V1, and the two power supply voltages are required to be isolated.
Two paths of voltage output by a product power supply are lack of one and have higher requirements on the precision of a voltage value, for example, the voltage V1 is mainly used for chip-level power supply, and the abnormal voltage value is directly related to the stability and the reliability of the operation of a product. The voltage V2 is used for supplying the outlet relay voltage, and the voltage value cannot be too low or too high, otherwise the product outlet is misoperated or refused to operate, and the like.
In a preferred embodiment of the present invention, the V1 starting unit of the power loss detection circuit of the relay protection product includes a second regulator U2, a first resistor R1, a third resistor R3, and a fourth resistor R4.
The first pin of the second voltage regulator U2 is connected to the positive electrode of the first path voltage V1 through a first resistor R1.
And a third pin of the second voltage stabilizer U2 is connected with the negative pole of the first path voltage V1.
The third resistor R3 and the fourth resistor R4 are connected in series and then connected between the positive pole and the negative pole of the first path voltage V1.
The second pin of the second regulator U2 is connected to a node between the third resistor R3 and the fourth resistor R4.
The technical effects are as follows: the V1 starting unit is used for starting an action end of a first voltage stabilizer (an optical coupler U1)
In a preferred embodiment of the present invention, the V1 starting unit of the power supply voltage loss detection circuit of the relay protection product further includes a current limiting resistor R9.
The current limiting resistor R9 is connected between the positive pole and the negative pole of the first path voltage V1.
The technical effects are as follows: the current limiting resistor R9 is used to regulate the current limiting effect.
In a preferred embodiment of the present invention, the V1 indicating unit of the power loss detection circuit for relay protection products includes a second resistor R2 and a first diode LED 1.
The second resistor R2 and the first diode LED1 are connected in series and then connected between the positive pole and the negative pole of the first path voltage V1.
In a preferred embodiment of the present invention, the V2 starting unit of the power loss detection circuit of the relay protection product includes a third regulator U3, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7.
The first pin of the third voltage stabilizer U3 is connected to the anode of the second path voltage V2 through a fifth resistor R5.
And a third pin of the third voltage stabilizer U3 is connected with the negative electrode of the second path of voltage V2.
The sixth resistor R6 and the seventh resistor R7 are connected in series and then connected with the negative electrode of the second path of voltage V2.
The second pin of the third regulator U3 is connected to a node between the sixth resistor R6 and the seventh resistor R7.
In a preferred embodiment of the present invention, the V2 starting unit of the power supply voltage loss detection circuit of the relay protection product further includes a current limiting resistor R10.
The current limiting resistor R10 is connected between the anode and the cathode of the second path voltage V2.
In a preferred embodiment of the present invention, the V2 indicating unit of the power loss detection circuit for relay protection products includes an eighth resistor R8 and a second diode LED 2.
The eighth resistor R8 and the second diode LED2 are connected in series and then connected between the positive pole and the negative pole of the second path voltage V2.
In a preferred embodiment of the present invention, the switch unit of the power loss detection circuit of the relay protection product includes a triode and a relay.
The triode is an NPN triode.
And the emitter of the NPN triode Q1 is connected with the relay.
When the voltage of the first path of voltage V1 and the second path of voltage V2 are abnormal, the optocoupler U1 does not act and cannot directly drive the NPN triode Q1 to act, the normally closed contact J1 does not act, and the normally closed contact drives an external signal to indicate that the product power supply is in voltage loss.
In a preferred embodiment of the present invention, the power supply voltage loss detection circuit of the relay protection product further includes a U1 voltage stabilization unit.
The U1 voltage regulation unit comprises a first capacitor C1.
The positive plate of the first capacitor C1 is connected with the anode of the diode of the optocoupler U1.
The negative plate of the first capacitor C1 is connected with the diode negative electrode of the optocoupler U1.
The technical effects are as follows: the U1 voltage stabilizing unit is used for stabilizing and filtering the action voltage of the emitting electrode of the optical coupler U1.
In a preferred embodiment of the present invention, the power supply voltage loss detection circuit of the relay protection product further includes a triode voltage stabilization unit.
The triode voltage stabilizing unit comprises a second capacitor C2.
The positive plate of the second capacitor C2 is connected with the base of the NPN triode Q1.
The negative plate of the second capacitor C2 is connected with the negative electrode of the second path voltage V2.
When the power supply voltage loss detection circuit of the relay protection product is started, a first path of voltage V1 starts an emitting electrode of an optical coupler U1 to act through an action threshold control loop (V1 starting unit) consisting of a second voltage stabilizer U2, a first resistor R1, a third resistor R3 and a fourth resistor R4, and the resistance values of the third resistor R3 and the fourth resistor R4 are adjusted to adjust the value of the first path of voltage V1; when an emitter of the optocoupler U1 operates, a receiver is conducted, the second path voltage V2 starts an NPN triode Q1 to operate through an operation threshold control loop (V2 starting unit) formed by a third voltage stabilizer U3, a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7, and the resistance values of the sixth resistor R6 and the seventh resistor R7 are adjusted to adjust the value of the detected second path voltage V2.
The embodiment of the utility model aims to protect a power supply voltage loss detection circuit of a relay protection product, and has the following effects:
1. the utility model can realize accurate detection of the voltage values of two paths of power supplies output by the relay protection product, and the voltage value of each path of detection is adjustable, thus being suitable for power supply output of different specifications.
2. And the detection of two output voltages of the power supply is realized by using one loop.
3. The action threshold driving loop can prevent the power-off signal from rejecting the outlet and mistakenly exiting the outlet.
4. The power supply voltage value is detected accurately and controllably, the circuit applicability is strong, and the circuit adopts discrete components, so that the cost is low and the realization is easy.
The above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A power supply voltage loss detection circuit of a relay protection product is characterized by comprising a V1 electrified indication unit, a V1 starting unit, a first voltage stabilizer, a V2 electrified indication unit, a V2 starting unit and a switch unit;
the V1 live indicating unit and the V1 starting unit are connected to a first path voltage V1 of a power supply;
the V2 charged indicating unit, the V2 starting unit and the switch unit are connected to a second path voltage V2 of a power supply;
the first pole of the first voltage stabilizer is connected to a first path voltage V1 of the power supply, and the second pole of the first voltage stabilizer is connected to a second path voltage V2 of the power supply;
the first voltage stabilizer adopts an optical coupler U1.
2. The power supply voltage loss detection circuit of the relay protection product according to claim 1,
the V1 starting unit comprises a second voltage stabilizer U2, a first resistor R1, a third resistor R3 and a fourth resistor R4;
a first pin of the second voltage regulator U2 is connected to the positive electrode of the first path voltage V1 through a first resistor R1;
a third pin of the second voltage stabilizer U2 is connected with the negative electrode of the first path voltage V1;
the third resistor R3 and the fourth resistor R4 are connected in series and then connected between the positive pole and the negative pole of the first path voltage V1;
the second pin of the second regulator U2 is connected to a node between the third resistor R3 and the fourth resistor R4.
3. The power supply voltage loss detection circuit of the relay protection product according to claim 2,
the V1 starting unit further comprises a current limiting resistor R9;
the current limiting resistor R9 is connected between the positive pole and the negative pole of the first path voltage V1.
4. The power supply voltage loss detection circuit of the relay protection product according to claim 1,
the V1 live indicating unit comprises a second resistor R2 and a first diode LED 1;
the second resistor R2 and the first diode LED1 are connected in series and then connected between the positive pole and the negative pole of the first path voltage V1.
5. The power supply voltage loss detection circuit of the relay protection product according to claim 1,
the V2 starting unit comprises a third voltage stabilizer U3, a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7;
a first pin of the third voltage stabilizer U3 is connected with the anode of the second path of voltage V2 through a fifth resistor R5;
a third pin of the third voltage stabilizer U3 is connected with the negative electrode of the second path of voltage V2;
the sixth resistor R6 and the seventh resistor R7 are connected in series and then connected with the negative electrode of the second path of voltage V2;
the second pin of the third regulator U3 is connected to a node between the sixth resistor R6 and the seventh resistor R7.
6. The power supply voltage loss detection circuit of the relay protection product according to claim 1,
the V2 starting unit further comprises a current limiting resistor R10;
the current limiting resistor R10 is connected between the anode and the cathode of the second path voltage V2.
7. The power supply voltage loss detection circuit of the relay protection product according to claim 1,
the V2 live indicating unit comprises an eighth resistor R8, a second diode LED 2;
the eighth resistor R8 and the second diode LED2 are connected in series and then connected between the positive pole and the negative pole of the second path voltage V2.
8. The power supply voltage loss detection circuit of the relay protection product according to claim 1,
the switch unit comprises a triode and a relay;
the triode is an NPN triode;
and the emitter of the NPN triode Q1 is connected with the relay.
9. The power supply voltage loss detection circuit of the relay protection product according to claim 1,
the device also comprises a U1 voltage stabilizing unit;
the U1 voltage stabilization unit comprises a first capacitor C1;
the positive plate of the first capacitor C1 is connected with the diode anode of the optocoupler U1;
the negative plate of the first capacitor C1 is connected with the diode negative electrode of the optocoupler U1.
10. The power supply voltage loss detection circuit of the relay protection product according to claim 8,
the triode voltage stabilizing unit is also included;
the triode voltage stabilizing unit comprises a second capacitor C2;
the positive plate of the second capacitor C2 is connected with the base of the NPN triode Q1;
the negative plate of the second capacitor C2 is connected with the negative electrode of the second path voltage V2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122365583.6U CN216387327U (en) | 2021-09-28 | 2021-09-28 | Voltage loss detection circuit for power supply of relay protection product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122365583.6U CN216387327U (en) | 2021-09-28 | 2021-09-28 | Voltage loss detection circuit for power supply of relay protection product |
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| Publication Number | Publication Date |
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| CN216387327U true CN216387327U (en) | 2022-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122365583.6U Active CN216387327U (en) | 2021-09-28 | 2021-09-28 | Voltage loss detection circuit for power supply of relay protection product |
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| CN (1) | CN216387327U (en) |
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2021
- 2021-09-28 CN CN202122365583.6U patent/CN216387327U/en active Active
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