CN204462240U - The ac power supply line state detection circuit of high sensitivity and high input impedance - Google Patents
The ac power supply line state detection circuit of high sensitivity and high input impedance Download PDFInfo
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- CN204462240U CN204462240U CN201520115675.0U CN201520115675U CN204462240U CN 204462240 U CN204462240 U CN 204462240U CN 201520115675 U CN201520115675 U CN 201520115675U CN 204462240 U CN204462240 U CN 204462240U
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- power supply
- supply line
- line state
- input impedance
- detection circuit
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Abstract
The utility model discloses the ac power supply line state detection circuit of a kind of high sensitivity and high input impedance, comprise diode rectifier circuit, it is characterized in that: AC detection circuit comprises: a switch triode, one Detection capacitance, Detection capacitance detects the voltage of an ac input end of diode rectifier circuit; The positive terminal of Detection capacitance is connected with one end of AC power by an anode isolation resistance, and the base stage of switch triode is connected with the positive terminal of Detection capacitance, and the collector and emitter of switch triode is used for voltage sense signal; The negative pole end of Detection capacitance is connected with the other end of AC power by a negative terminal isolation resistance, and the negative pole end ground connection of Detection capacitance, charges to the positive terminal of Detection capacitance all the time to realize AC power.The ac power supply line state detection circuit of a kind of high sensitivity that the utility model object there is provided and high input impedance.
Description
Technical field
The utility model relates to the ac power supply line state detection circuit of a kind of high sensitivity and high input impedance, and this testing circuit is mainly for the detection of the supply line's state (comprising power supply state and line impedance) using alternating current as the device of input source.
Background technology
Ac power supply line state detection circuit in the past mainly based on the direct current obtained after detecting half-wave rectification, especially for the circuit of emergency power pack or emergency lighting system.Known using alternating current as the detection of supply line's state of the device of input source.The major defect of circuit was as follows in the past:
1, the existence of half-wave rectification makes circuit and deposits two cover commutation systems, and circuit devcie increases, and reliability reduces;
2, detection sensitivity and input impedance are inversely proportional to: circuit proposes the input impedance that highly sensitive measure mainly reduces testing circuit, namely the resistance of resistance in series on testing circuit is reduced, and the reduction of input impedance can make the power consumption of testing circuit greatly increase, in the middle of practical application, on testing circuit, the value of resistance in series is more thorny;
3, because the input end of testing circuit is connected with the bridge rectifier input end of Switching Power Supply, after old friend flows end power-off, the impedance in startup (or auxiliary power supply) loop of power unit can affect the duty of testing circuit;
4, when limiting power consumption, sensitivity adjustment scope is minimum;
False triggering phenomenon is there is in 5, single fire input, single zero input or equipment parallel connection when using.
Utility model content
The utility model object is to overcome the deficiencies in the prior art, a kind of high sensitivity provided and the ac power supply line state detection circuit of high input impedance.
The purpose of this utility model is achieved through the following technical solutions:
The ac power supply line state detection circuit of high sensitivity and high input impedance, comprise diode rectifier circuit and AC detection circuit, diode rectifier circuit carries out rectification to the AC-input voltage supplied from AC power and forms a DC power supply apparatus, and DC power supply apparatus provides direct supply by the positive side DC output end of diode rectifier circuit and minus side DC output end to load end; The minus side DC output end ground connection of diode rectifier circuit, minus side DC output end becomes the reference potential of DC power supply apparatus; AC detection circuit is located at inside or the outside of this DC power supply apparatus, detects ac power supply line state and outputs level signals; It is characterized in that:
AC detection circuit comprises:
One Threshold detection switch, Threshold detection switch is switch triode;
One direct supply, the base stage that direct supply is switch triode by bigoted resistance provides bias voltage;
One Detection capacitance, it exchanges dispatch from foreign news agency and line impedance change for detecting whether to have; The base stage of switch triode is connected with the positive terminal of Detection capacitance, and the collector and emitter of switch triode is used for voltage sense signal; The positive terminal of Detection capacitance is connected with one end of AC power by an anode isolation resistance, the negative pole end of Detection capacitance is connected with the other end of AC power by a negative terminal isolation resistance, the negative pole end ground connection of Detection capacitance, make Detection capacitance with the reference potential of DC power supply apparatus for benchmark, realize AC power and all the time the positive terminal of Detection capacitance is charged.
The ac power supply line state detection circuit of high sensitivity described above and high input impedance, is characterized in that: described Detection capacitance is parallel with a clamper voltage stabilizing diode.
The ac power supply line state detection circuit of high sensitivity described above and high input impedance, is characterized in that: the load end of described DC power supply apparatus is in series with auxiliary resistance.
The ac power supply line state detection circuit of high sensitivity described above and high input impedance, it is characterized in that: described auxiliary resistance place branch road is in series with an isolation voltage stabilizing diode, when inputting without dispatch from foreign news agency, isolation voltage stabilizing diode makes the anti-voltage of filling with of testing circuit cannot conducting load circuit, thus significantly improve power end input impedance, eliminate false triggering.
The ac power supply line state detection circuit of high sensitivity described above and high input impedance, it is characterized in that: the load end of described DC power supply apparatus is parallel with a power filtering capacitor, power filtering capacitor anode is connected with the positive side DC output end of diode rectifier circuit, and power filtering capacitor negative terminal is connected with the minus side DC output end of diode rectifier circuit.
The ac power supply line state detection circuit of high sensitivity described above and high input impedance, is characterized in that: described Threshold detection switch is positive-negative-positive switch triode.
The ac power supply line state detection circuit of high sensitivity described above and high input impedance, is characterized in that: described diode rectifier circuit is full-wave bridge rectifier circuit.
The ac power supply line state detection circuit of high sensitivity described above and high input impedance, is characterized in that: described anode isolation resistance and loop, negative terminal isolation resistance place are also parallel with anti-interference capacitor.
The ac power supply line state detection circuit of high sensitivity described above and high input impedance, is characterized in that: be in series with adjustable resistance between the collector of described switch triode and the negative pole end of Detection capacitance.
The utility model effect is as follows:
1, Detection capacitance negative terminal is connected with the ground of DC power supply apparatus, and testing circuit is charged to Detection capacitance by anode isolation resistance when exchanging positive half cycle; When exchanging negative half period, electric current is released by negative terminal isolation resistance and diode rectifier circuit earth terminal by testing circuit, makes the electricity of Detection capacitance not by the impact of input reversing;
2, DC power supply apparatus power initiation (or auxiliary power supply) end is provided with auxiliary resistance, auxiliary resistance auxiliary power start or auxiliary power supply, auxiliary resistance place branch road is in series with an isolation voltage stabilizing diode, when inputting without dispatch from foreign news agency, isolation voltage stabilizing diode makes the anti-voltage of filling with of testing circuit cannot conducting load circuit, thus significantly improve power end input impedance, eliminate false triggering.
3, test side utilizes PNP type triode as threshold switch, makes to detect while electric current reduces to improve input impedance, plays a driving role to elimination false triggering meanwhile.
Accompanying drawing explanation
Fig. 1 is the utility model DC power supply apparatus and AC detection circuit figure.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but embodiment of the present utility model is not limited thereto.
As shown in Figure 1, the ac power supply line state detection circuit of high sensitivity and high input impedance, comprises diode rectifier circuit D1 and AC detection circuit, and diode rectifier circuit D1 is full-wave bridge rectifier circuit.Diode rectifier circuit D1 carries out rectification to the AC-input voltage supplied from AC power and forms a DC power supply apparatus, and DC power supply apparatus provides direct supply by the positive side DC output end of diode rectifier circuit D1 and minus side DC output end to load end; The minus side DC output end ground connection of diode rectifier circuit D1, minus side DC output end becomes the reference potential of DC power supply apparatus; AC detection circuit is located at inside or the outside of this DC power supply apparatus, detects ac power supply line state and outputs level signals.
AC detection circuit comprises:
One Threshold detection switch Q1, Threshold detection switch Q1 is positive-negative-positive switch triode;
One direct supply, direct supply is battery BT, and the base stage that direct supply is switch triode by bigoted resistance R4 provides bias voltage;
One Detection capacitance C4, Detection capacitance C4 are parallel with a clamper voltage stabilizing diode D3, clamper voltage stabilizing diode D3 about value 6V, Detection capacitance C4 its for detect whether have exchange dispatch from foreign news agency and line impedance change; The base stage of switch triode is connected with the positive terminal of Detection capacitance, and the collector and emitter of switch triode is used for voltage sense signal; The positive terminal of Detection capacitance is connected with one end of AC power by an anode isolation resistance R2, the negative pole end of Detection capacitance is connected with the other end of AC power by a negative terminal isolation resistance R3, the negative pole end ground connection of Detection capacitance, make Detection capacitance with the reference potential of DC power supply apparatus for benchmark, realize AC power and all the time the positive terminal of Detection capacitance C4 is charged.Anode isolation resistance more than R2 resistance value 500K, negative terminal isolation resistance more than R3 resistance value 500K, Detection capacitance C4 is 1nF.
Further improvement: the load end of DC power supply apparatus is in series with auxiliary resistance R1, auxiliary resistance R1 place branch road is in series with an an isolation voltage stabilizing diode D2 and accessory power supply filter capacitor C2, when inputting without dispatch from foreign news agency, isolation voltage stabilizing diode D2 makes the anti-voltage of filling with of testing circuit cannot conducting load circuit, thus significantly improve power end input impedance, eliminate false triggering.
Further improvement: the load end of DC power supply apparatus is parallel with a power filtering capacitor C1, power filtering capacitor C1 anode is connected with the positive side DC output end of diode rectifier circuit D1, and power filtering capacitor C1 negative terminal is connected with the minus side DC output end of diode rectifier circuit D1.
Further improvement: anode isolation resistance R2 and loop, negative terminal isolation resistance R3 place are also parallel with anti-interference capacitor C3.
Further improvement: be in series with adjustable resistance RJ between the collector of switch triode and the negative pole end of Detection capacitance, adjustable resistance RJ is adjustment of sensitivity resistance, and adjustable resistance RJ can be adjusted to infinity.
Claims (9)
1. the ac power supply line state detection circuit of high sensitivity and high input impedance, comprise diode rectifier circuit and AC detection circuit, diode rectifier circuit carries out rectification to the AC-input voltage supplied from AC power and forms a DC power supply apparatus, and DC power supply apparatus provides direct supply by the positive side DC output end of diode rectifier circuit and minus side DC output end to load end; The minus side DC output end ground connection of diode rectifier circuit, minus side DC output end becomes the reference potential of DC power supply apparatus; AC detection circuit is located at inside or the outside of this DC power supply apparatus, detects ac power supply line state and outputs level signals; It is characterized in that:
AC detection circuit comprises:
One Threshold detection switch, Threshold detection switch is switch triode;
One direct supply, the base stage that direct supply is switch triode by bigoted resistance provides bias voltage;
One Detection capacitance, the base stage of switch triode is connected with the positive terminal of Detection capacitance, and the collector and emitter of switch triode is used for voltage sense signal; The positive terminal of Detection capacitance is connected with one end of AC power by an anode isolation resistance, the negative pole end of Detection capacitance is connected with the other end of AC power by a negative terminal isolation resistance, the negative pole end ground connection of Detection capacitance, make Detection capacitance with the reference potential of DC power supply apparatus for benchmark, realize AC power and all the time the positive terminal of Detection capacitance is charged.
2. the ac power supply line state detection circuit of high sensitivity and high input impedance according to claim 1, is characterized in that: described Detection capacitance is parallel with a clamper voltage stabilizing diode.
3. the ac power supply line state detection circuit of high sensitivity and high input impedance according to claim 1, is characterized in that: the load end of described DC power supply apparatus is in series with auxiliary resistance.
4. the ac power supply line state detection circuit of high sensitivity and high input impedance according to claim 3, is characterized in that: described auxiliary resistance place branch road is in series with an isolation voltage stabilizing diode.
5. the ac power supply line state detection circuit of high sensitivity and high input impedance according to claim 1 or 3, it is characterized in that: the load end of described DC power supply apparatus is parallel with a power filtering capacitor, power filtering capacitor anode is connected with the positive side DC output end of diode rectifier circuit, and power filtering capacitor negative terminal is connected with the minus side DC output end of diode rectifier circuit.
6. the ac power supply line state detection circuit of high sensitivity and high input impedance according to claim 1, is characterized in that: described Threshold detection switch is positive-negative-positive switch triode.
7. the ac power supply line state detection circuit of high sensitivity and high input impedance according to claim 1, is characterized in that: described diode rectifier circuit is full-wave bridge rectifier circuit.
8. the ac power supply line state detection circuit of high sensitivity and high input impedance according to claim 1, is characterized in that: described anode isolation resistance and loop, negative terminal isolation resistance place are also parallel with anti-interference capacitor.
9. the ac power supply line state detection circuit of high sensitivity and high input impedance according to claim 1, is characterized in that: be in series with adjustable resistance between the collector of described switch triode and the negative pole end of Detection capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520115675.0U CN204462240U (en) | 2015-02-16 | 2015-02-16 | The ac power supply line state detection circuit of high sensitivity and high input impedance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520115675.0U CN204462240U (en) | 2015-02-16 | 2015-02-16 | The ac power supply line state detection circuit of high sensitivity and high input impedance |
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| CN204462240U true CN204462240U (en) | 2015-07-08 |
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| CN201520115675.0U Expired - Fee Related CN204462240U (en) | 2015-02-16 | 2015-02-16 | The ac power supply line state detection circuit of high sensitivity and high input impedance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114449709A (en) * | 2020-11-03 | 2022-05-06 | 电威电机工厂股份有限公司 | Garden lamp control system and control method thereof |
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2015
- 2015-02-16 CN CN201520115675.0U patent/CN204462240U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114449709A (en) * | 2020-11-03 | 2022-05-06 | 电威电机工厂股份有限公司 | Garden lamp control system and control method thereof |
| CN114449709B (en) * | 2020-11-03 | 2023-10-31 | 电威电机工厂股份有限公司 | Garden lamp control system and control method thereof |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150708 Termination date: 20170216 |