CN2183612Y - Overcurrent protector for high-frequency electronic circuit - Google Patents
Overcurrent protector for high-frequency electronic circuit Download PDFInfo
- Publication number
- CN2183612Y CN2183612Y CN 94205616 CN94205616U CN2183612Y CN 2183612 Y CN2183612 Y CN 2183612Y CN 94205616 CN94205616 CN 94205616 CN 94205616 U CN94205616 U CN 94205616U CN 2183612 Y CN2183612 Y CN 2183612Y
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- Prior art keywords
- electronic circuit
- metalwork
- frequency
- overcurrent protector
- frequency current
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- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 238000004804 winding Methods 0.000 claims abstract description 5
- 239000011521 glass Substances 0.000 claims description 5
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Abstract
The overcurrent protector for high-frequency electronic circuits comprises a high-frequency current sampling unit and a control unit, and is characterized in that the high-frequency current sampling unit is a high-frequency current sampling coil (3) at least comprising one winding, the control unit is at least two metal pieces (4, 5) which are connected with a circuit to be controlled and can be contacted, wherein at least one metal piece is any metal piece B (4) which is arranged in the high-frequency current sampling coil (3) and can generate displacement due to eddy current heating in a high-frequency alternating magnetic field. The overcurrent protector for the high-frequency electronic circuit has the advantages of simple structure, low cost and good reliability, and can be widely used for overcurrent protection of various high-frequency electronic devices.
Description
The utility model is to belong to the electronic circuit protection that is under the abnormal work situation to use components and parts, is specifically related to the High-Frenquency Electronic Circuit overcurrent protector.
In high-frequency electronic equipment, when abnormalities such as overvoltage, overburden or short circuit occurring, the high-frequency current in the electronic circuit sharply increases, and promptly overcurrent often causes electronic devices and components, even equipment is burnt.People are damaged to avoid electronic circuit and equipment by protective circuit or protector are set in High-Frenquency Electronic Circuit for this reason.For example; existing a kind of High-Frenquency Electronic Circuit over-current protection method; seeing accompanying drawing 4, is current foldback circuit partly in the frame of broken lines among the figure, and it is the complicated circuit that is made of components and parts such as resistance, electric capacity, diode, triode, controllable silicons; cost height not only; volume is big, and poor reliability, sometimes also can misoperation; bad adaptability has limited the scope of application.
The utility model provides a kind of simple in structure at the deficiency of above-mentioned High-Frenquency Electronic Circuit over-current protection method, and cost is low, and volume is little, reliability height, the High-Frenquency Electronic Circuit overcurrent protector that the scope of application is wide.Can prevent effectively that High-Frenquency Electronic Circuit from burning electronic devices and components because of overcurrent under abnormality.
High-Frenquency Electronic Circuit overcurrent protector described in the utility model; comprise the high-frequency current sampling unit that is used for being serially connected in the loop that high-frequency circuit is easy to generate overcurrent; and control unit; it is characterized in that described high-frequency current sampling unit is the high-frequency current sample coil that includes a winding at least; described control unit is at least two metalworks that can contact that are connected through the fixing circuit with needs control of fixed terminal, wherein have at least a metalwork be placed in the above-mentioned high-frequency current sample coil any one in high-frequency alternating magnetic field because of producing the metalwork B that eddy-current heating causes deformational displacement.
When the High-Frenquency Electronic Circuit of electronic equipment is in the abnormal work state; its resonance current sharply increases; the electric current that flows through in the protector sample coil increases thereupon; high-frequency alternating magnetic field increases in the coil; place the metalwork B in the coil to produce the eddy current increase; its increase of generating heat; because of deformational displacement takes place in thermal expansion; when displacement during greater than set point; the former contactee of being of two metalworks is then disconnected; the former disconnection person of system then contacts, and the circuit or the deenergization of the needs that are connected with two metalworks control or quit work or give the alarm prevents that electronic equipment from being burnt.
Above-mentioned high-frequency current sample coil can be a coil that winding technique forms, and takes a sample from a radio circuit; Also can be the coil that a plurality of winding techniques form, from a plurality of radio circuits, take a sample.For example: two or more output loops are taken a sample, when arbitrary output loop produces overcurrent, can both cause that high-frequency alternating magnetic field increases in the coil, make the control unit action, realize overcurrent protection to the electronic circuit of many output loops.
The utility model is described in further detail below in conjunction with accompanying drawing
Fig. 1 is the utility model overcurrent protective device structural representation.
Fig. 2 is a control unit metalwork compound mode schematic diagram of the present utility model.
Fig. 3 is the utility model overcurrent protection manner of movement schematic diagram.
Fig. 4 is existing overcurrent protection conspectus.
Fig. 8 is the utility model overcurrent protection conspectus.
As Fig. 1 a, shown in the 1b, at least two metalworks that can contact that above-mentioned control unit is included, wherein have a kind of metalwork B(4 that is placed in the above-mentioned high-frequency current sample coil 3 at least), this metalwork B can produce eddy-current heating and cause deformational displacement in the alternating magnetic field that sample coil produces; And the additional metals part 5 that wherein can contact with above-mentioned deformation metalwork B can be a kind of metalwork A that can not produce deformation, also can be another metalwork B that is placed in the above-mentioned high-frequency current sample coil.Its compound mode can be A-B, B-B, four kinds of modes of A-B-A, B-A-B as shown in Figure 2.Its manner of movement is divided into open type (a) as shown in Figure 3, normally closed shape (b), and conversion hysteria (c) is to satisfy different needs.In order to guarantee that the spacing between the contact 6 is a design load, preferably adopt fixed terminal 7 that metalwork 4 and metalwork 5 are fixed into one.
Metalwork B is a kind of deformation metal, it can be a kind of thrermostatic bimetal-plate, as 5j11,5j14,5j16 etc., also can be a kind of shape memory metal spare, can also be the sub-assembly that is made of two kinds of metals, for example can be by eddy-current heating metal 10(such as iron, nickel and alloy thereof) and deformation metal 4 formation sub-assemblies.
Metalwork A selects the good conductor of electricity usually for use, as Dumet wire, and copper or copper alloy.
The size of metalwork A depends primarily on the size that needs Control current, and requires that enough intensity is arranged, and when contacting with metalwork B plastic deformation can not take place.Generally select for use diameter for φ 0.5mm to φ 1.5mm, length 5mm is to the 15mm metal bar.
The ratio of the length and width of metalwork B is preferably 3, and thickness preferably is controlled at 1/10th to 1/20th of width.Reference dimension is: length be 10mm to 25mm, wide for 1mm to 5mm, thickness is that 0.2mm is to 0.5mm.Distance is decided on the voltage swing and the required protection action sensitivity of required control circuit between metalwork A, the B.Spacing is little, and is highly sensitive, and the protection action is fast, but control voltage is then lower.When required control voltage was less than or equal to 1000 volts, spacing was elected 0.5mm as to 1mm.
In order to prevent the metalwork contact oxidation, prevent heat dissipation, improve sensitivity, usually metalwork A, B are arranged on one and vacuumize in the sealed glass tube.When control voltage is higher, also can in seal glass, fill, in order to avoid spark is played in the contact when action with inert gas.
Use should be provided with contact 6 in metal A, B contact site when the occasion of the big electric current of control, generally use the silver-bearing copper sheet.Use is when the little occasion of Control current, and metalwork A, B itself can be used as the contact.
For easy to use, and when producing in enormous quantities, the pin 9 of metalwork A, B can be made into the plug-in type pin, can directly insert in the wiring board, also can directly insert in the socket.This moment, pin size was chosen as: diameter phi 0.4mm is to φ 1.5mm, and long 6mm is to 10mm.
The pin 9 of two metalworks can be drawn with welded wire, also can be that metalwork itself is made pin.Pin is selected Dumet wire for use usually with material, because of its coefficient of expansion identical with the coefficient of expansion of vitreous fixed terminal 7.
The high frequency sample coil can directly be wrapped on the glass tube 1, also can independently make a coil and be enclosed within outside the metalwork B, can also be wound on the skeleton that has pin, and its lead-in wire 8 is welded on the pin of skeleton.
When design high-frequency current sample coil, the main number of ampere turns of determining coil according to the sensitivity of moving by the size of current and the required protection of coil.Number of ampere turns is big, and is highly sensitive, generally between the 5-50 ampere-turn.
Protective layer (2) can be set, to guarantee insulation and safety outside sample coil.
For example, a kind of overcurrent protector that is used for the abnormal work state of electronic ballast for fluorescent lamp, energy-saving lamp electronic ballast, its overall dimension is φ 12mm * 22mm Cylinder, pin is the Dumet wire plug-in type pin of φ 0.8mm * 8mm.The high-frequency current sample coil is wrapped in the coil of 20 ampere-turns on the skeleton of being with pin with φ 0.25mm enamelled wire, its wire bonds is on the pin of skeleton.Metalwork A is φ 0.8mm * 18mm Dumet wire, and metalwork B is the 5j16 thrermostatic bimetal-plate, and it is of a size of long 10mm, wide 2mm, and thick is 0.22mm.Metalwork A, B spacing are 1mm and simultaneously in fixed terminal is fixed on sealed glass tube, outsourcing fire retardant plastic protective sleeve.
The utility model can be made into the overcurrent protector of different size, to be adapted to the overcurrent protection of high-frequency electronic equipment.The overcurrent protector that electronic ballast for fluorescent lamp, energy-saving lamp electronic ballast, quartz lamp electronic transformer are arranged that for example is used for less electric current, what be adapted to big electric current has microwave oven, an electromagnetic stove overcurrent protector.
Overcurrent protector of the present utility model, simple in structure compared with prior art, cost is low, and is highly sensitive, the reliability height, and shared volume, area are very little.Energy-saving lamp electronic ballast for example; because of space in its lamp holder very little; existing any current protection technology can't realize that also therefore the domestic and international energy-saving lamp electronic ballast of producing does not all solve the overcurrent protection problem, and the present invention provides effective ways for solving this technical barrier.Therefore the utility model has wide range of applications, and is adapted to the overcurrent protection of any High-Frenquency Electronic Circuit.
Embodiment:
Fig. 6 is the utility model overcurrent protector protection electric ballast schematic diagram, and part is the differential mode protective circuit in the frame of broken lines.
When the fluorescent lamp filament intact; but during because of the sub-ability of old and feeble acomia radio; fluorescent tube is starter not; be called differential mode this moment; L; C5 constitutes series resonant circuit; resonance current increases suddenly, is serially connected in L; the electric current that the high frequency sample coil of the differential mode protective device in C5 loop is flow through increases thereupon, makes the control unit action of protective device; contact J connects; with the primary short of oscillation transformer T, the secondary no-voltage output of T, then triode Q1; Q2 quits work because of losing feedback voltage; claim the major loop failure of oscillation this moment, reached the protection triode, that is protected the purpose of electric ballast.
Fig. 7 is another overcurrent protection execution mode of the utility model: be used to protect the quartz lamp electronic transformer.
Q1, Q2 constitute separated exciting square wave half bridge oscillator among the figure.R, C3 and DIAC are circuits for triggering.The high-frequency high-voltage of high frequency square wave is flowed through behind the transformer T2, becomes the output of high frequency low voltage electric current and supplies with quartz lamp work secondary.When differential mode took place, the T2 primary current increased, and electric current increases in the sample coil of Chuan Jie differential mode protective device with it; the control unit action of this protective device, contact J connects, and makes the C3 short circuit; circuits for triggering quit work, and Q1, the Q2 failure of oscillations have protected the quartz lamp electronic transformer not burnt.
Fig. 8 is the utility model overcurrent protector protection microwave oven schematic diagram, and frame of broken lines inside is divided into current foldback circuit among the figure.
Alternating voltage becomes direct voltage by rectifying and wave-filtering and is added to two of square-wave oscillator Q1, Q2 and recommends on the triode, export through transformer T transformation, its high frequency square wave again through D5, D6 rectification after L, C2 filtering obtain a high direct voltage and are added to anode of magnetron, make the magnetron operate as normal.When overcurrent takes place when; the high-frequency current sample coil electric current that is serially connected in the square wave oscillation loop increases; the action of overcurrent protector control unit; J closure in contact in the circuit, the control utmost point short circuit of Q1, Q2, loss signal; Q1, Q2 quit work; the square-wave oscillator failure of oscillation, thus high power transistor Q1, Q2 protected, microwave oven reason overcurrent and burning not then.
Fig. 9 is an overcurrent protector protection electromagnetic stove schematic diagram of the present utility model.
The sample coil of overcurrent protective device inserts high-power switching transistor emitter-base bandgap grading in the high-frequency oscillating circuits; when producing overcurrent; the triode emitter current increases, and the electric current that flows through sample coil increases thereupon, when electric current during greater than set point; the control unit action of protective device; contact J closure, CONTROL CIRCUIT is blocked in the circuit, the high-frequency generator failure of oscillation; thereby protected high power transistor, electromagnetic stove is reason overcurrent and burning not.
Claims (6)
1; a kind of High-Frenquency Electronic Circuit overcurrent protector; comprise the high-frequency current sampling unit that is used for being serially connected in the loop that High-Frenquency Electronic Circuit is easy to generate overcurrent; and control unit; it is characterized in that described high-frequency current sampling unit is the high-frequency current sample coil (3) that includes a winding at least; described control unit is through fixing at least two metalworks (4 that can contact of fixed terminal (7); 5), wherein have at least a metalwork be placed in the above-mentioned high-frequency current sample coil any one in high-frequency alternating magnetic field because of producing the metalwork B (4) that eddy-current heating causes deformational displacement.
2, High-Frenquency Electronic Circuit overcurrent protector as claimed in claim 1 is characterized in that described metalwork B(4) be thermo bimetal's part.
3, High-Frenquency Electronic Circuit overcurrent protector as claimed in claim 1 is characterized in that described metalwork B(4) be shape memory metal spare.
4, High-Frenquency Electronic Circuit overcurrent protector as claimed in claim 1 is characterized in that described metalwork B(4) be the sub-assembly that constitutes by paramagnetic metal and thermo bimetal.
5, High-Frenquency Electronic Circuit overcurrent protector as claimed in claim 1 is characterized in that described metalwork B(4) the metal group component formed by paramagnetic material and shape memory metal.
6,, it is characterized in that described control unit is sealed in the glass tube with vacuum (1) as claim 1,2,3,4,5 described High-Frenquency Electronic Circuit overcurrent protectors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94205616 CN2183612Y (en) | 1994-03-28 | 1994-03-28 | Overcurrent protector for high-frequency electronic circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94205616 CN2183612Y (en) | 1994-03-28 | 1994-03-28 | Overcurrent protector for high-frequency electronic circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2183612Y true CN2183612Y (en) | 1994-11-23 |
Family
ID=33824485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94205616 Expired - Fee Related CN2183612Y (en) | 1994-03-28 | 1994-03-28 | Overcurrent protector for high-frequency electronic circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2183612Y (en) |
-
1994
- 1994-03-28 CN CN 94205616 patent/CN2183612Y/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Liu Fengshi Document name: payment instructions |
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| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Liu Fengshi Document name: Notice of termination |
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |