CN215005794U - Power failure monitoring circuit - Google Patents
Power failure monitoring circuit Download PDFInfo
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- CN215005794U CN215005794U CN202120020845.2U CN202120020845U CN215005794U CN 215005794 U CN215005794 U CN 215005794U CN 202120020845 U CN202120020845 U CN 202120020845U CN 215005794 U CN215005794 U CN 215005794U
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Abstract
The utility model discloses a power failure monitoring circuit, which is characterized in that the power failure monitoring circuit comprises a full-wave rectifier bridge, two input ends of the full-wave rectifier bridge are respectively connected with a power output signal through a divider resistor R1 and a divider resistor R2, and two output ends of the full-wave rectifier bridge are connected with a filter circuit and the divider circuit and then are connected with the same-phase input end of a comparator; the inverting input end of the comparator is connected with a reference comparison voltage supply circuit; the output end of the comparator is connected with the input end of the optocoupler U1, and the output end of the optocoupler U1 is connected with an alarm reminding circuit or a post-stage control circuit. The utility model discloses can satisfy wider scope's power failure detection simply, conveniently, safe and reliable ground. The independent power supply adopts an isolation power supply with high isolation voltage, so that very high isolation voltage can be realized, and the interference between the detection circuit and the power supply is reduced.
Description
Technical Field
The utility model relates to a power failure monitoring circuit belongs to electron electrical experiment and equips technical field.
Background
The power failure monitoring circuit is generally applied to electronic and electrical experimental equipment and is used for monitoring whether a user power supply is manually disconnected or whether the power supply is disconnected due to a failure. The power supply condition of the user power supply is detected through the power failure monitoring circuit, and then the result is directly informed to the user through sound and light reminding, or the power supply condition of the user power supply is transmitted to a PLC or other controllers through an I/O port for further processing.
The existing power failure monitoring circuit converts alternating current into direct current through a rectifying circuit, then drives an optical coupler through resistance current limiting, and an output end of the optical coupler drives an acousto-optic reminding circuit or a post-stage control circuit. Although the power failure monitoring circuit can transmit the state of the power supply and has a simpler circuit structure, the power failure monitoring circuit has the following defects: 1) after the working range of the power supply is changed, the power supply fault monitoring circuit cannot be conveniently adjusted; 2) the resistor power used for limiting the current in the power failure monitoring circuit generally has a large volume, and cannot meet the requirements of miniaturization and integration of the whole device.
Disclosure of Invention
The utility model aims at: the power failure monitoring circuit can complete load regulation in an electric automatic control mode according to test parameters.
In order to achieve the above object, the present invention provides a power failure monitoring circuit, which is characterized in that the power failure monitoring circuit comprises a full-wave rectifier bridge, two input terminals of the full-wave rectifier bridge are respectively connected to a power output signal through a voltage dividing resistor R1 and a voltage dividing resistor R2, and two output terminals of the full-wave rectifier bridge are connected to a filter circuit and the voltage dividing circuit and then connected to a non-inverting input terminal of a comparator; the inverting input end of the comparator is connected with a reference comparison voltage supply circuit; the output end of the comparator is connected with the input end of the optocoupler U1, and the output end of the optocoupler U1 is connected with an alarm reminding circuit or a post-stage control circuit.
Preferably, the full-wave rectifier bridge is composed of four diodes.
Preferably, the filter circuit comprises a filter capacitor C1 connected across the two outputs of the full wave rectifier bridge.
Preferably, the voltage divider circuit comprises a voltage divider resistor R3 connected across the two outputs of the full wave rectifier bridge.
Preferably, the reference comparison voltage supply circuit includes a constant voltage source, an output end of the constant voltage source is connected in series with the resistor R4 and the resistor R5 and then grounded, and an inverting input end of the comparator is grounded via the resistor R5.
Preferably, the constant voltage source comprises a power conversion chip, a positive input end of the power conversion chip is connected with a direct current power supply end of the switching power supply through the input filter circuit and the anti-reverse diode D22, and a negative input end of the power conversion chip is grounded; the positive output end and the negative output end of the power supply conversion chip are connected with the output end of the constant voltage source through an output filter circuit; and a capacitor C13 is connected between the positive input end and the positive output end of the power conversion chip in a bridging manner.
Preferably, the input filter circuit comprises a TVS diode D23, a filter capacitor C14 and a filter capacitor C14 which are connected across the positive input end and the negative input end of the power conversion chip, the TVS diode D23, the filter capacitor C14 and the filter capacitor C14 are connected in parallel and then connected with a current filter inductor L2, and the current filter inductor L2 is connected with the positive input end of the power conversion chip.
Preferably, the output filter circuit includes a resistor R25, a filter capacitor C16 and a filter capacitor C17 connected across the positive output end and the negative output end of the power conversion chip, the resistor R25, the filter capacitor C16 and the filter capacitor C17 are connected in parallel and then connected in series with a resistor R24, and the resistor R24 is connected to the output end of the constant voltage source.
The utility model discloses through increasing one-level voltage comparator circuit on the basis of original scheme, the comparison signal of comparator is mains voltage sampling voltage and comparator reference voltage respectively, and the comparison voltage through changing the comparator can change the operating voltage scope that is detected the power very conveniently. In addition, because the operational amplifier is adopted with large input impedance, the required input current is very small, the sampling resistor for power supply voltage adopts the level of M omega, the current of the voltage-dividing resistor is very small in the whole power supply voltage range, the power consumption of the resistor is very low, and the integration and the miniaturization can be realized conveniently. The utility model discloses owing to increased one-level comparator circuit, need provide independent power all the way for comparator circuit more, this independent power adopts high isolation voltage's isolation power, can realize very high isolation voltage, reduces the interference between acquisition circuit and the power supply.
Drawings
FIG. 1 is a schematic diagram of a power failure monitoring circuit;
fig. 2 is a schematic diagram of an independent power supply circuit.
Detailed Description
The present invention will be further described with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.
As shown in fig. 1, it is a schematic diagram of a power failure monitoring circuit provided by the present invention. The power supply signal is input to a full-wave rectifier bridge composed of diodes D1-D4 through a voltage dividing resistor R1 and a voltage dividing resistor R2 with high resistance values. The full-wave rectifier bridge converts alternating current signals into alternating current and direct current signals, then the alternating current and direct current signals are filtered by the filter capacitor C1, the alternating current and direct current signals are filtered into direct current signals, and then the voltage division of the direct current signals on the voltage division resistor R3 is sent to the non-inverting input end of the comparator. The reference comparison voltage is input to the inverting input terminal of the comparator. In this embodiment, the resistor R4 and the resistor R5 divide the +12V voltage output by the constant voltage source to generate a reference comparison voltage, and those skilled in the art can set the reference comparison voltage of the comparator by adjusting the values of the resistor R4 and the resistor R5. The output of the comparator is fed to an optocoupler U1 for driving an optocoupler U1. The output generated by the optical coupler U1 is sent to an acousto-optic warning circuit and/or a control circuit of a later stage.
As shown in fig. 2, the constant voltage source in this embodiment includes a power chip U6, and the power chip U6 is a front-back stage 3KV isolated power conversion chip. The DC24V provided by the constant voltage source is supplied by the switching power supply IN the system, and the DC24V provided by the switching power supply firstly passes through an anti-reverse diode D22 and then is input into the positive input end IN + of the power supply chip U6 through the input filter circuit. The input filter circuit comprises a TVS diode D23, a filter capacitor C14, a filter capacitor C15 and a current filter inductor L2, wherein the TVS diode D23, the filter capacitor C14 and the filter capacitor C15 are connected IN parallel, and the TVS diode D23, the filter capacitor C14 and the filter capacitor C15 are connected between a positive input end IN + and a negative input end IN-of the power supply chip U6 IN a bridging mode. The negative input terminal IN-of the power chip U6 is grounded.
The voltage signals output by the positive output end VOUT + and the negative output end VOUT-of the power supply conversion chip generate +12V voltage through the output filter circuit. In this embodiment, the output filter circuit includes a filter capacitor C16, a filter capacitor C17, a resistor R25, and a resistor R24 connected in series with the filter capacitor C16, the filter capacitor C17, and the resistor R25. The filter capacitor C16, the filter capacitor C17 and the resistor R25 are connected between the positive output end VOUT + and the negative output end VOUT-of the power supply chip U6 in a bridge mode.
And a capacitor C13 is connected between the positive input end IN + and the positive output end VOUT + of the power conversion chip IN a cross mode.
The utility model discloses can satisfy wider scope's power failure detection simply, conveniently, safe and reliable ground. The independent power supply adopts an isolation power supply with high isolation voltage, so that very high isolation voltage can be realized, and the interference between the detection circuit and the power supply is reduced.
Claims (8)
1. A power failure monitoring circuit is characterized by comprising a full-wave rectifier bridge, wherein two input ends of the full-wave rectifier bridge are respectively connected with a power output signal through a voltage-dividing resistor R1 and a voltage-dividing resistor R2, and two output ends of the full-wave rectifier bridge are connected with a filter circuit and the voltage-dividing circuit and then are connected with a non-inverting input end of a comparator; the inverting input end of the comparator is connected with a reference comparison voltage supply circuit; the output end of the comparator is connected with the input end of the optocoupler U1, and the output end of the optocoupler U1 is connected with an alarm reminding circuit or a post-stage control circuit.
2. The power failure monitoring circuit of claim 1 wherein the full wave rectifier bridge is comprised of four diodes.
3. A power failure monitoring circuit as claimed in claim 1 wherein the filter circuit comprises a filter capacitor C1 connected across the two outputs of the full wave rectifier bridge.
4. A power failure monitoring circuit as claimed in claim 1 wherein the voltage divider circuit comprises a voltage divider resistor R3 connected across the two outputs of the full wave rectifier bridge.
5. The power failure monitor circuit as claimed in claim 1, wherein the reference comparison voltage supply circuit comprises a constant voltage source, an output terminal of the constant voltage source is connected in series with a resistor R4 and a resistor R5 and then connected to ground, and an inverting input terminal of the comparator is connected to ground through a resistor R5.
6. The power failure monitoring circuit of claim 5, wherein the constant voltage source comprises a power conversion chip, a positive input terminal (IN +) of the power conversion chip is connected to the DC power supply terminal of the switching power supply via the input filter circuit and the anti-reverse diode D22, and a negative input terminal (IN-) of the power conversion chip is grounded; the positive output end (VOUT +) and the negative output end (VOUT-) of the power supply conversion chip are connected with the output end of the constant voltage source through an output filter circuit; and a capacitor C13 is connected between the positive input end (IN +) and the positive output end (VOUT +) of the power conversion chip IN a bridging manner.
7. The power failure monitor circuit as claimed IN claim 6, wherein the input filter circuit comprises a TVS diode D23, a filter capacitor C14 and a filter capacitor C14 connected across the positive input terminal (IN +) and the negative input terminal (IN-) of the power conversion chip, the TVS diode D23, the filter capacitor C14 and the filter capacitor C14 are connected IN parallel and then connected with a current filter inductor L2, and the current filter inductor L2 is connected with the positive input terminal (IN +) of the power conversion chip.
8. The power failure monitor circuit as claimed in claim 6, wherein the output filter circuit comprises a resistor R25, a filter capacitor C16 and a filter capacitor C17 connected across the positive output terminal (VOUT +) and the negative output terminal (VOUT-) of the power conversion chip, the resistor R25, the filter capacitor C16 and the filter capacitor C17 are connected in parallel and then connected in series with a resistor R24, and the resistor R24 is connected to the output terminal of the constant voltage source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120020845.2U CN215005794U (en) | 2021-01-06 | 2021-01-06 | Power failure monitoring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120020845.2U CN215005794U (en) | 2021-01-06 | 2021-01-06 | Power failure monitoring circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215005794U true CN215005794U (en) | 2021-12-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120020845.2U Active CN215005794U (en) | 2021-01-06 | 2021-01-06 | Power failure monitoring circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215005794U (en) |
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2021
- 2021-01-06 CN CN202120020845.2U patent/CN215005794U/en active Active
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