CN202586267U - On-line phase voltage monitoring device - Google Patents
On-line phase voltage monitoring device Download PDFInfo
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- CN202586267U CN202586267U CN 201220072561 CN201220072561U CN202586267U CN 202586267 U CN202586267 U CN 202586267U CN 201220072561 CN201220072561 CN 201220072561 CN 201220072561 U CN201220072561 U CN 201220072561U CN 202586267 U CN202586267 U CN 202586267U
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- circuit
- voltage
- comparator
- detection circuit
- monitoring device
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Abstract
The utility model relates to an on-line phase voltage monitoring device. The device comprises a power grid voltage detecting circuit, a current detecting circuit and a trigger circuit, wherein signals acquired by the current detecting circuit are transmitted to a comparator circuit, and output signals of the power grid voltage detecting circuit and the comparator circuit is transmitted to a load driving circuit and an indicating lamp circuit under control of the trigger circuit. In the device, the power grid voltage detecting circuit and the current detecting circuit which are simple but reliable are used to acquire fault signals of a power supply; when the power supply has faults, a driving signal is emitted, and the load power supply is cut off, thereby ensuring that instruments operate safely. Thus, the device has the advantages including simple and novel principles, reliable working, and low cost.
Description
Technical field
The utility model relates to a kind of supervising device, particularly be a kind of phase voltage on-line monitoring device.
Background technology
In the AC system of alternating current equipment instrument etc., power failure such as power supply crosses, under-voltage, overload happens occasionally, and the potential safety hazard of its existence will cause enormous economic loss to people, and traditional protective device is single, and price is more expensive.
The utility model content
The purpose of the utility model is to overcome above-mentioned deficiency, and a kind of phase voltage on-line monitoring device is provided.
The utility model solves the technical scheme that its technical problem adopted: the phase voltage on-line monitoring device; Comprise network voltage detection circuit, current detection circuit and circuits for triggering; The signal of said current detection circuit collection transfers to comparator circuit, and the output signal of network voltage detection circuit and comparator circuit is sent to load driving circuits, indicator light circuit through circuits for triggering control.
Further, said network voltage detection circuit connects voltage stabilizing didoe DW by the output of sampling potentiometer W1, and the base stage that the output of voltage stabilizing didoe DW is connected to transistor Q1 constitutes.
Further, said circuits for triggering adopt NE555 comparison circuit U1, and its input is connected with potentiometer W2.
Further, said current detection circuit is by current transformer LA series diode D1, diode D1 shunt capacitance C1, and parallelly connected again potentiometer W constitutes behind the series resistance R1, and potentiometer W is parallel with capacitor C 2, C3.
Further, said comparator circuit adopts LM358 voltage comparator ic 1, and the output of LM358 voltage comparator ic 1 is connected to the NE555 comparison circuit U1 input of circuits for triggering through resistance R 5, diode D3.
Through adopting above-mentioned technical scheme; The beneficial effect of the utility model is: this device adopts Simple and Reliable network voltage detection circuit and current detection circuit to gather power failure signal; When power failure takes place when, send drive signal, cut off load power source; To reach protection instrument purpose of safe operation, this principle of device is simple, novelty, reliable operation, cost.
Description of drawings
Fig. 1 is the frame assumption diagram of the utility model;
Fig. 2 is the circuit theory diagrams of the utility model.
Embodiment
Like Fig. 1, shown in Figure 2; The phase voltage on-line monitoring device of the utility model; Comprise network voltage detection circuit 1, current detection circuit 2 and circuits for triggering 3; The signal that said current detection circuit 2 is gathered transfers to comparator circuit 21, and network voltage detection circuit 1 is sent to load driving circuits 31, indicator light circuit 32 with the output signal of comparator circuit 21 through circuits for triggering 3 controls.
Said network voltage detection circuit 1 connects voltage stabilizing didoe DW by the output of sampling potentiometer W1, and the base stage that the output of voltage stabilizing didoe DW is connected to transistor Q1 constitutes, and said circuits for triggering 3 adopt NE555 comparison circuit U1; Its input is connected with potentiometer W2, and just often (190～240V), sampling potentiometer W1 sampling makes voltage stabilizing didoe DW end when line voltage; Also not conducting of transistor Q1 no-bias like this, the 4th pin preset of NE555 comparison circuit U1 presents high level, simultaneously; Potentiometer W2 sampling makes NE555 comparison circuit U1 trigger its 2nd pin voltage less than trigger value 1/3Vcc, thus NE555 comparison circuit U1 internal trigger, its 3rd pin output high potential; Isolate output through resistance 1R6 current limliting, diode D4, RT provides trigger current to bidirectional triode thyristor, bidirectional triode thyristor RT conducting; The load normal power supply; Simultaneously, end the 7th pin inside of NE555 comparison circuit U1, and LED 1 is not luminous.
When in case line voltage surpasses 260V, voltage stabilizing didoe DW, the equal conducting of transistor Q1, the 4th pin preset of NE555 comparison circuit U1 is near 0V; Simultaneously, its 2nd pin trigger voltage is higher than Vcc1/3, makes the upset of NE555 comparison circuit U1 internal circuit; Its 3rd pin output low level, its 7th pin crystal inside conducting output low level, LED 1 luminous warning; Bidirectional triode thyristor RT ends, and cuts off load power source.
When line voltage is lower than 190V,, make potentiometer W2 voltage greater than Vcc1/3 through potentiometer W1, W2 sampling; The 2nd pin of NE555 comparison circuit U1 is high level, is same as the 6th pin voltage greater than 2/3Vcc, makes the NE555 comparison circuit U1 output low level that resets; Bidirectional triode thyristor RT triggerless voltage and ending; Cut off load power source, the 7th pin output low level of NE555 comparison circuit U1 makes LED 1 luminous warning simultaneously.
Said current detection circuit 2 is by current transformer LA series diode D1; Diode D1 shunt capacitance C1; Constitute at parallelly connected potentiometer W behind the series resistance R1; Potentiometer W is in series with capacitor C 2, C3, and comparator circuit 21 adopts LM358 voltage comparator ic 1, and the output of LM358 voltage comparator ic 1 is connected to the NE555 comparison circuit U1 input of circuits for triggering 3 through resistance R 5, diode D3.When the phase line of passing current transformer LA had electric current to pass through, LA level of current transformer produced induced signal, and this signal is through diode D1 rectification, capacitor C 1 filtering, resistance R 1 current limliting, and adjustment potentiometer W is used for check and correction and the linear output of input voltage.This signal is input to the 2nd pin of LM358 voltage comparator ic 1, forms the voltage reference setting voltage value by the 3rd pin of resistance R 2, resistance R 3, LM358 voltage comparator ic 1, when surpassing 1.5 times of rated current, is judged as overcurrent fault.The 2nd pin magnitude of voltage of LM358 voltage comparator ic 1 is during greater than its 3rd pin magnitude of voltage, the upset of LM358 voltage comparator ic 1 internal comparator, the 1st pin output high level signal of LM358 voltage comparator ic 1; Through resistance R 5 current limlitings, diode D3 isolates the about 4V voltage of output, is input to the 2nd pin of NE555 comparison circuit U1; At this moment, potentiometer W2 voltage is greater than Vcc1/3, and the 2nd pin of NE555 comparison circuit U1 is high level; Be same as its 6th pin voltage greater than 2/3Vcc; Make the NE555 comparison circuit U1 output low level that resets, bidirectional triode thyristor RT triggerless voltage and ending cuts off load power source; The 7th pin output low level of NE555 comparison circuit U1 makes LED 1 luminous warning simultaneously.
An above-described preferred embodiment that is merely the utility model can not limit the scope that the utility model is implemented, and every equalization of being done according to the utility model claim changes and decorates, and all should still belong in the scope that the utility model contains.
Claims (5)
1. phase voltage on-line monitoring device; It is characterized in that: comprise network voltage detection circuit (1), current detection circuit (2) and circuits for triggering (3); The signal that said current detection circuit (2) is gathered transfers to comparator circuit (21), and network voltage detection circuit (1) is sent to load driving circuits (31), indicator light circuit (32) with the output signal of comparator circuit (21) through circuits for triggering (3) control.
2. phase voltage on-line monitoring device according to claim 1; It is characterized in that: said network voltage detection circuit (1) connects voltage stabilizing didoe DW by the output of sampling potentiometer W1, and the base stage that the output of voltage stabilizing didoe DW is connected to transistor Q1 constitutes.
3. phase voltage on-line monitoring device according to claim 1 is characterized in that: said circuits for triggering (3) adopt NE555 comparison circuit U1, and its input is connected with potentiometer W2.
4. phase voltage on-line monitoring device according to claim 1; It is characterized in that: said current detection circuit (2) is by current transformer LA series diode D1; Diode D1 shunt capacitance C1, parallelly connected again potentiometer W constitutes behind the series resistance R1, and potentiometer W is parallel with capacitor C 2, C3.
5. according to claim 1 or 3 described phase voltage on-line monitoring devices; It is characterized in that: said comparator circuit (21) adopts LM358 voltage comparator ic 1, and the output of LM358 voltage comparator ic 1 is connected to the NE555 comparison circuit U1 input of circuits for triggering (3) through resistance R 5, diode D3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220072561 CN202586267U (en) | 2012-03-01 | 2012-03-01 | On-line phase voltage monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220072561 CN202586267U (en) | 2012-03-01 | 2012-03-01 | On-line phase voltage monitoring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202586267U true CN202586267U (en) | 2012-12-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220072561 Expired - Fee Related CN202586267U (en) | 2012-03-01 | 2012-03-01 | On-line phase voltage monitoring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202586267U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066554A (en) * | 2012-12-12 | 2013-04-24 | 常州联力自动化科技有限公司 | Single-phase source leakage detection circuit for isolated neutral system |
-
2012
- 2012-03-01 CN CN 201220072561 patent/CN202586267U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066554A (en) * | 2012-12-12 | 2013-04-24 | 常州联力自动化科技有限公司 | Single-phase source leakage detection circuit for isolated neutral system |
| CN103066554B (en) * | 2012-12-12 | 2015-02-25 | 常州联力自动化科技有限公司 | Single-phase source leakage detection circuit for isolated neutral system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121205 Termination date: 20130301 |