CN2777799Y - Converter with electric leakage protection circuit - Google Patents
Converter with electric leakage protection circuit Download PDFInfo
- Publication number
- CN2777799Y CN2777799Y CN 200520038729 CN200520038729U CN2777799Y CN 2777799 Y CN2777799 Y CN 2777799Y CN 200520038729 CN200520038729 CN 200520038729 CN 200520038729 U CN200520038729 U CN 200520038729U CN 2777799 Y CN2777799 Y CN 2777799Y
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- Prior art keywords
- resistance
- operational amplifier
- protection circuit
- leakage protection
- circuit
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- Protection Of Static Devices (AREA)
Abstract
The utility model relates to a converter with a leakage protection circuit, which comprises a main circuit and the leakage protection circuit, wherein the main circuit comprises a fore oscillation circuit, a rear inversion circuit, etc., and the leakage protection circuit outputs control signal to the main circuit according to leakage current signal detected from a ground wire so as to control the output AC power supply to be switched off. Since the protection circuit which detects the current of the ground wire is internally inlaid, the utility model has the advantages that a human body is safely protected, the cost is lowered and the mechanical structure is not influenced.
Description
Technical field
The utility model relates to a kind of transducer, relates in particular to a kind of transducer with leakage protection circuit.
Background technology
In the transducer product, perfect various protection to product or element is arranged, as overcurrent, overvoltage, under-voltage excess temperature or the like, but safeguard protection to the person is arranged seldom in use.
Even have for earth leakage protective, the earth leakage protective device and the earth leakage protective socket that are applied to electric main are arranged at present, such device can be applied in the transducer product too as the electric leakage safeguard protection.
But the principle that such device adopts is that difference current detects, and includes electronics part and mechanical structure two partly, the cost height, and volume is big, and can change the mechanical structure of transducer.
Above-mentioned defective makes such device seldom use in the transducer product, also makes common transducer product be difficult to realize creepage protection function.
Summary of the invention
The utility model technical issues that need to address have provided a kind of transducer with leakage protection circuit, are intended to solve above-mentioned defective.
In order to solve the problems of the technologies described above, the utility model is achieved through the following technical solutions:
The utility model comprises: the main circuit that contains prime oscillating circuit, back level inverter circuit etc.; Also comprise a leakage protection circuit; Described leakage protection circuit is according to being turned off in order to the AC power of controlling output to main circuit from control signal of detected leakage current signal output on the ground wire.
Compared with prior art, the beneficial effects of the utility model are: owing to be by the protective circuit of built-in detection ground line current, both accomplished the safeguard protection to the person, and accomplished with low costly again, and do not influenced mechanical structure.
Description of drawings
Fig. 1 is a module frame chart of the present utility model;
Fig. 2 is the concrete line map of leakage protection circuit in the utility model;
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail:
By Fig. 1, Fig. 2 as seen: the utility model comprises: the main circuit that contains prime oscillating circuit, back level inverter circuit etc.; Also comprise a leakage protection circuit; Described leakage protection circuit is according to being turned off in order to the AC power of controlling output to main circuit from control signal of detected leakage current signal output on the ground wire;
Described leakage protection circuit comprises a GND detection signal end, an operational amplifier; The signal of described GND detection signal end via the 5th resistance R 5, the tenth resistance R 10, the 9th resistance R 9, the 4th resistance R 4 is connected successively and the 6th resistance R 6 positive terminal in parallel and be input to operational amplifier by the node of the tenth resistance R 10 and the 9th resistance R 9; The node of the tenth resistance R 10 and the 9th resistance R 9 is connected with the end of oppisite phase of operational amplifier by the 3rd diode D3; The end of oppisite phase of described operational amplifier also links together through the 3rd resistance R 3 with the positive pole of power supply; The positive pole of described operational amplifier is connected minus earth with the positive pole of power supply; The positive terminal that second resistance R 2 that the leading up to successively of the output of described operational amplifier connects and the second diode D2 feed back to operational amplifier, another road first electric capacity E1 is connected with ground, and Third Road is connected with ground to produce control signal through the second electric capacity E2 with the first diode D1 and by the node that first resistance R 1 is connected with the first diode D1 by first resistance R 1 that connects successively; The node of described the 4th resistance R 4 and the 6th resistance R 6 is connected with ground; The connected node of the end of oppisite phase of described the 3rd resistance R 3 and operational amplifier also is connected with ground by voltage-stabiliser tube Z1.
When transducer in work and during output voltage; if someone touches any one among AC-N and the AC-L; will by human body to GND (can be earthing screw by casing be connected to the earth or the vehicles " ") form the loop; this electric circuit inspection is during to effective leakage current value (being not less than 4mA); output one effective high level signal removes control transformation device circuit; make the AC power of output be forced to turn-off, thereby protected personal safety.
Circuit working principle: in using transducer; when the user touches a certain phase (ACL or ACN) in the AC power of transducer output because of carelessness and causes the electric current of the person of flowing through to reach when being not less than 4mA; GND detection signal end in this circuit detects this signal; dividing potential drop on resistance R 9 and R4 makes the positive terminal 3 of operational amplifier detect this signal; and make the voltage of positive terminal 3 be higher than the voltage of the end of oppisite phase 2 of operational amplifier; the output 1 of operational amplifier presents high level; the high level signal one tunnel that output 1 produces is through resistance R 2; diode D2 feedback loop is stablized the voltage of output 1 to positive terminal 3; another road is by resistance R 1; electric capacity E2; diode D1; make and produce a high level signal--control signal; utilize control signal can remove to control the controlled end of inverter circuit; turn-off the output AC power source of transducer, reach the effect of protection personal safety at once.Promptly reach the effect of GFCI.D3 in the circuit plays the protection operational amplifier.Electric capacity E1, E2 play smooth signal waveform.
This leakage protection module circuit can be incorporated in the brand-new converter circuit, also can be used as one independently circuit module realize the creepage protection function of transducer, can in the transducer product of reality, apply in a flexible way.
Claims (2)
1. the transducer with leakage protection circuit comprises: the main circuit that contains prime oscillating circuit, back level inverter circuit etc.; It is characterized in that: also comprise a leakage protection circuit; Described leakage protection circuit is according to being turned off in order to the AC power of controlling output to main circuit from control signal of detected leakage current signal output on the ground wire.
2. the transducer with leakage protection circuit according to claim 1 is characterized in that: described leakage protection circuit comprises a GND detection signal end, an operational amplifier; The signal of described GND detection signal end via the 5th resistance (R5), the tenth resistance (R10), the 9th resistance (R9), the 4th resistance (R4) connect successively in parallel with the 6th resistance (R6), and be input to the positive terminal of operational amplifier by the node of the tenth resistance (R10) and the 9th resistance (R9); The node of the tenth resistance (R10) and the 9th resistance (R9) is connected with the end of oppisite phase of operational amplifier by the 3rd diode (D3); The end of oppisite phase of described operational amplifier also links together through the 3rd resistance (R3) with the positive pole of power supply; The positive pole of described operational amplifier is connected minus earth with the positive pole of power supply; The positive terminal that second resistance (R2) that the leading up to successively of the output of described operational amplifier connects and second diode (D2) feed back to operational amplifier, another road first electric capacity (E1) is connected with ground, and Third Road is connected with ground to produce control signal through second electric capacity (E2) with first diode (D1) and by the node that first resistance (R1) is connected with first diode (D1) by first resistance (R1) that connects successively; Described the 4th resistance (R4) is connected with ground with the node of the 6th resistance (R6); The connected node of the end of oppisite phase of described the 3rd resistance (R3) and operational amplifier also is connected with ground by voltage-stabiliser tube (Z1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520038729 CN2777799Y (en) | 2005-01-05 | 2005-01-05 | Converter with electric leakage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520038729 CN2777799Y (en) | 2005-01-05 | 2005-01-05 | Converter with electric leakage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2777799Y true CN2777799Y (en) | 2006-05-03 |
Family
ID=36745173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520038729 Expired - Fee Related CN2777799Y (en) | 2005-01-05 | 2005-01-05 | Converter with electric leakage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2777799Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102931645A (en) * | 2011-08-09 | 2013-02-13 | 珠海格力电器股份有限公司 | Ground wire live protection circuit and method and air conditioner with circuit |
| US10966464B2 (en) | 2008-04-30 | 2021-04-06 | Philip Morris Usa Inc. | Electrically heated smoking system having a liquid storage portion |
-
2005
- 2005-01-05 CN CN 200520038729 patent/CN2777799Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10966464B2 (en) | 2008-04-30 | 2021-04-06 | Philip Morris Usa Inc. | Electrically heated smoking system having a liquid storage portion |
| CN102931645A (en) * | 2011-08-09 | 2013-02-13 | 珠海格力电器股份有限公司 | Ground wire live protection circuit and method and air conditioner with circuit |
| CN102931645B (en) * | 2011-08-09 | 2016-03-30 | 珠海格力电器股份有限公司 | Ground wire live protection circuit and method and air conditioner with circuit |
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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: 20060503 Termination date: 20140105 |