CN2912059Y - Current limit protecting solid-state relay - Google Patents
Current limit protecting solid-state relay Download PDFInfo
- Publication number
- CN2912059Y CN2912059Y CN 200620051415 CN200620051415U CN2912059Y CN 2912059 Y CN2912059 Y CN 2912059Y CN 200620051415 CN200620051415 CN 200620051415 CN 200620051415 U CN200620051415 U CN 200620051415U CN 2912059 Y CN2912059 Y CN 2912059Y
- Authority
- CN
- China
- Prior art keywords
- current
- circuit
- signal
- state relay
- limiting protection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Relay Circuits (AREA)
Abstract
The utility model relates to a solid state relay, in particular to a current limiting protection type solid state relay. Which comprises a low voltage control part and a high voltage switch part, the utility model is characterized in that the current limiting protection part is provided, an adjustable resistance TR end is positioned in the relay case for an adjusting fault current value, wherein the current limiting protection part comprises a current limiting signal detection circuit, a rectifying comparison evaluating circuit and a protective action output circuit, the low voltage control part receives an external control power supply signal, drives the high voltage switch output part to switch the solid state relay after an internal conversion, the current limiting protection part detects the high voltage circuit current flowing through after the high voltage switch output part is connected with the high voltage circuit, if the current exceeds the set protection value, the current limiting protection part acts, so the low voltage control part and the high voltage switch output part cannot work, and the solid state relay stops work. The utility model has long period of usage and highly reliable performance, and switching transient effect hardly exists.
Description
Technical field
The utility model relates to solid-state relay, refers in particular to band current-limiting protection formula solid-state relay.
Background technology
Existing solid-state relay load end mostly is interchange, voltage range 24V～600V, current range 0A～125A; Control end mostly is direct current, and input voltage 3V～32V is about input current 10mA.Insulation voltage 4KV, input and output isolation voltage 2.5KV.Generally form by low voltage control part and high-voltage switch gear output two parts.Low voltage control partly obtains low-voltage control signal provides stable electric current to the photoelectricity buffer circuit that is coupled by triode, photoelectricity coupling buffer circuit separates low voltage control partial circuit and high-voltage switch gear output circuit, but control signal can be flowed to the high-voltage switch gear output.The high-voltage switch gear output receives the switch controlling signal that photoelectricity coupling buffer circuit is sent here, carries out the action in switch high-pressure loop by output element (TRIAC or anti-parallel connection thyristor).Realize the function in low-voltage control signal switch high-pressure loop.The high-voltage switch gear output also has the RC circuit and piezo-resistance absorbs to make surge.The major defect of existing solid-state relay is all not have the current limliting defencive function, does not close means automatically when the permission operating current appears surpassing in the high-voltage switch gear output loop of solid-state relay, will continue this big electric current of circulation, and element causes damage in to high tension loop.Even it is also bad to add the protective device effect in the external circuit of high tension loop because the output element of solid-state relay very responsive tens of in addition tens milliseconds in can damage, general protective device can't play a protective role.Solid-state relay has not maintenanceability, must change after the damage, will cause fault recovery to postpone, and easily causes more large economy loss.
Summary of the invention
The purpose of this utility model is improved, is innovated at shortcoming that exists in the background technology and problem, and a kind of stable performance is provided, the current-limiting protection formula solid-state relay that the life-span is long.
The technical solution of the utility model is: construct a kind of solid-state relay with current-limiting protection device; comprise low voltage control part and high-voltage switch gear part; be characterized in that the utility model is provided with the current-limiting protection part; reach and on the relay housing, be provided with adjustable resistance TR end; in order to adjust the fault current value; wherein the current-limiting protection part is by the current limliting signal detection circuit; commutating ratio is than the value circuit; protection action output circuit is formed; described low voltage control partly receives the external control power supply signal; carry out the switch motion of solid-state relay by internal conversion rear drive high-voltage switch gear output; current-limiting protection is partly surveyed the high-voltage switch gear output and is connected the high tension loop electric current that flows through after the high tension loop; if electric current surpasses the protection value of setting; then current-limiting protection is partly moved low voltage control part and high-voltage switch gear output can't be worked, and solid-state relay is quit work.
The utlity model has high life and highly reliable performance, and do not have mechanical movement structure, the contact function is finished by solid state device, and switching speed can be a Millisecond; No electromagnetic interference does not have input " coil " and contact striking and rebound, is zero voltage switch, turn-offs at the conducting of no-voltage place, zero current place, does not almost have the switching transient effect.
Description of drawings
Fig. 1 is the utility model electricity functional-block diagram
Fig. 2 is the electrical schematic diagram of single phase poaer supply band fixed resistance
Fig. 3 is the electrical schematic diagram of single phase poaer supply band adjustable resistance
Fig. 4 is the electrical schematic diagram that three phase mains band fixed resistance can cut off three-phase simultaneously
Fig. 5 is the electrical schematic diagram that three phase mains band adjustable resistance can cut off three-phase simultaneously
Fig. 6 is the electrical schematic diagram of a three phase mains band fixed resistance disengagement failure phase
Fig. 7 is the electrical schematic diagram of a three phase mains band adjustable resistance disengagement failure phase
Fig. 8 is the three-phase and the one-phase relay shell schematic diagram of band LED light
Fig. 9 is three-phase and the one-phase relay shell schematic diagram of band LED light and adjustable resistance TR
Embodiment
As shown in Figure 1; the utility model comprises low voltage control part (1) and high-voltage switch gear output (2); be characterized in that the utility model is provided with current-limiting protection part (3); reach adjustable resistance TR end is set on the relay housing; in order to adjust the fault current value; wherein current-limiting protection part (3) is by current limliting signal detection circuit (3-1); commutating ratio is than value circuit (3-2); protection action output circuit (3-3) is formed; described low voltage control part (1) receives the external control power supply signal; carry out the switch motion of solid-state relay by internal conversion rear drive high-voltage switch gear output (2); current-limiting protection part (3) is surveyed high-voltage switch gear output (2) and is connected the high tension loop electric current that flows through after the high tension loop; if electric current surpasses the protection value of setting; then current-limiting protection part (3) action can't be worked low voltage control part (1) and high-voltage switch gear output (2), and solid-state relay is quit work.
By Fig. 2 to 9 as can be known, low voltage control part described in the utility model (1) is made up of control power supply current stabilization drive circuit (1-1) and photoelectricity coupling buffer circuit (1-2), control power supply current stabilization drive circuit (1-1) links to each other with photoelectricity coupling buffer circuit (1-2), when the external control power supply signal is imported, be that direct current signal then directly uses, if AC signal then becomes direct current signal by rectification, direct current signal makes the input of photoelectricity coupling buffer circuit (1-2) receive this signal after controlling the element current stabilization in the power supply current stabilization drive circuit (1-1), and photoelectricity coupling buffer circuit (1-2) is sent to high-voltage switch gear output (2) with this low-tension supply signal by output.Described high-voltage switch gear output (2) comprises high voltage switch circuit (2-1) and surge absorbing circuit (2-2); high voltage switch circuit (2-1) mesohigh switch element is connected in the output of photoelectricity coupling buffer circuit (1-2); when the output of photoelectricity coupling buffer circuit (1-2) provides signal; then make the switch element of high voltage switch circuit (2-1) carry out switch motion; thereby realize from low voltage control part (1) input control signal; the function of control high-voltage switch gear output (2), surge absorbing circuit (2-2) also is connected in high voltage switch circuit (2-1) upward with the element in the protection high voltage switch circuit (2-1).Described current-limiting protection part (3) obtains AC signal voltage by current limliting signal detection circuit (3-1) by the high tension loop electric current of responding to high-voltage switch gear output (2); this AC signal voltage is sent to commutating ratio to carry out rectification than value circuit (3-2) and becomes direct current; commutating ratio is sent to protection action output circuit (3-3) than value circuit (3-2) with this d. c. voltage signal value and compares; if this signal voltage is greater than the protection operation voltage of protecting action output circuit (3-3); then protection action output circuit (3-3) protection action; the control power supply current stabilization drive circuit (1-1) of low voltage control part (1) cuts out, thereby make high-voltage switch gear output (2) can not get signal and quit work.Applicable to single phase poaer supply and three phase mains, during three phase mains, the protection value that the electric current of any phase high tension loop surpass to be set can be cut off single-phase separately or three-phase cuts off simultaneously.Described whole circuit can be encapsulated in the industrial box of standard solid state relay, and insulation, curing glue fire-retardant, heat conduction can be made current-limiting protection formula solid-state relay in the filling, and wherein the box appearance is provided with LED light and adjustable resistance TR end.
Physical circuit of the present utility model is formed and operation principle:
The low voltage control partial circuit: by triode Q1, LED 1, voltage stabilizing didoe WD1, resistance R 11, R12, R13, R14 form control power supply current stabilization drive circuit (1-1); Optocoupler components IC forms photoelectricity coupling buffer circuit (1-2).After low-voltage control power carries signal to come, resistance R 13, R14 provide a constant operating current for voltage-stabiliser tube WD1, the voltage of WD1 has been kept the baseline stability voltage of triode Q1 and has been determined the voltage that IC bore that Q1 connected, the emitter E of Q1 and R15 series connection are to the negative electrode of controlling power supply, and the resistance of R15 determines the size of Q1 and IC electric current.The collector electrode of Q1 is connected with the input of optocoupler components IC and is connected in the anode of control power supply.IC is switched on when Q1 is excited conducting by WD1, and the IC output links to each other with high-voltage switch gear output (2).LED 1 is in parallel with IC, if IC work, then LED1 work is luminous.
High-voltage switch gear output: form high voltage switch circuit (2-1) by anti-parallel connection thyristor SCR21, SCR22, resistance R 21; Resistance R 22 and capacitor C 21 are formed surge absorbing circuit (2-2).Optocoupler components IC excites interior lights electric induction when its input flows through electric current, in the output conducting that two controllable silicon SCR 21, the SCR22 of high voltage switch circuit is open-minded, and closing and opening of SCR21, SCR22 is exactly the switch motion of high tension loop.C21 and R22 form surge absorbing circuit, when surge voltage appears in high tension loop, can absorb with the protection silicon controlled main rectifier.
Current-limiting protection part: form current limliting signal detection circuit (3-1) by current transformer TA, adjustable resistance TR or fixed resistance R31; Resistance R 32 and bridge rectifier diode D1～D4 forms commutating ratio than value circuit (3-2); Resistance R 33, capacitor C 31 and controllable silicon SCR 31 are formed protection action output circuit (3-3).After high tension loop is opened, there is electric current to flow through in the high tension loop.Current transformer TA can produce a corresponding output current.TR (R31) is connected with TA.When TA has electric current when output, can produce at the two ends of TR (R31) one with the electric current correspondent voltage, can obtain signal voltage with the corresponding different proportion of electric current by the size of adjusting TR (R31).The signal voltage that will obtain at TR (R31) two ends flows through R32 and becomes direct-flow signal voltage at its two ends behind bridge rectifier D1～D4.Its voltage and SCR31 trigger voltage compare, and it is not open-minded to be lower than trigger voltage SCR31, and then SCR31 is open-minded to be higher than trigger voltage.R33 is connected in the SCR31 control end and plays metering function.C31 also rises at the SCR31 control end and to prevent that SCR31 from because of external interference misoperation taking place.After SCR31 is opened, formed the closed-loop path of low-voltage control power, cause the base voltage of Q1 not enough, thereby can't make the Q1 conducting, cause optocoupler components IC not have signal, the high-voltage switch gear output is closed.Reach the purpose of current-limiting protection.Three-phase diagram is consistent with single-phase figure principle, and the use element of each phase is all identical.When being the protection action, different protection winding diagrams can allow a protection action disengagement failure phase or three-phase cut off simultaneously.
The utility model current-limiting protection formula solid-state relay can solve former solid-state relay unprotect function and the flimsy defective of short circuit.Its circuit element can directly make an addition in original solid-state relay standard industry box.When having super setting to allow electric current to flow through in the current-limiting protection formula solid-state relay high-voltage switch gear output loop; the current-limiting protection structure just can be moved in the one-period of electric current solid-state relay is turn-offed, and restriction output loop fault current is to reach the function of protection solid-state relay and whole high tension loop.When selecting trimmable resistance for use, the value of this fault current can on-the-spotly be adjusted, and carries out corresponding protection and adjusts.
Embodiment described in the utility model only is the description that preferred implementation of the present utility model is carried out; be not that the utility model design and scope are limited; do not breaking away under the preceding topic of the utility model design philosophy; engineers and technicians make the technical solution of the utility model in this area various modification and improvement; all should fall into protection range of the present utility model; the technology contents that the utility model is asked for protection all is documented in claims.
Claims (6)
1; a kind of current-limiting protection formula solid-state relay; comprise low voltage control part (1) and high-voltage switch gear output (2); it is characterized in that the utility model is provided with current-limiting protection part (3); reach and on the relay housing, be provided with adjustable resistance TR end; in order to adjust the fault current value; wherein current-limiting protection part (3) is by current limliting signal detection circuit (3-1); commutating ratio is than value circuit (3-2); protection action output circuit (3-3) is formed; described low voltage control part (1) receives the external control power supply signal; carry out the switch motion of solid-state relay by internal conversion rear drive high-voltage switch gear output (2); current-limiting protection part (3) is surveyed high-voltage switch gear output (2) and is connected the high tension loop electric current that flows through after the high tension loop; if electric current surpasses the protection value of setting; then current-limiting protection part (3) action can't be worked low voltage control part (1) and high-voltage switch gear output (2), and solid-state relay is quit work.
2; current-limiting protection formula solid-state relay according to claim 1; it is characterized in that described low voltage control part (1) is made up of control power supply current stabilization drive circuit (1-1) and the photoelectricity buffer circuit (1-2) that is coupled; control power supply current stabilization drive circuit (1-1) links to each other with photoelectricity coupling buffer circuit (1-2); when the external control power supply signal is imported; be that direct current signal then directly uses; if AC signal then becomes direct current signal by rectification; direct current signal makes the input of photoelectricity coupling buffer circuit (1-2) receive this signal after controlling the element current stabilization in the power supply current stabilization drive circuit (1-1), and photoelectricity coupling buffer circuit (1-2) is sent to high-voltage switch gear output (2) with this low-tension supply signal by output.
3; current-limiting protection formula solid-state relay according to claim 1; it is characterized in that described high-voltage switch gear output (2) comprises high voltage switch circuit (2-1) and surge absorbing circuit (2-2); high voltage switch circuit (2-1) mesohigh switch element is connected in the output of photoelectricity coupling buffer circuit (1-2); when the output of photoelectricity coupling buffer circuit (1-2) provides signal; then make the switch element of high voltage switch circuit (2-1) carry out switch motion, surge absorbing circuit (2-2) also is connected in high voltage switch circuit (2-1) upward with the element in the protection high voltage switch circuit (2-1).
4; current-limiting protection formula solid-state relay according to claim 1; it is characterized in that described current-limiting protection part (3) obtains AC signal voltage by current limliting signal detection circuit (3-1) by the high tension loop electric current of responding to high-voltage switch gear output (2); this AC signal voltage is sent to commutating ratio to carry out rectification than value circuit (3-2) and becomes direct current; commutating ratio is sent to protection action output circuit (3-3) than value circuit (3-2) with this d. c. voltage signal value and compares; if this signal voltage is greater than the protection operation voltage of protecting action output circuit (3-3); then protection action output circuit (3-3) protection action; the control power supply current stabilization drive circuit (1-1) of low voltage control part (1) cuts out, make high-voltage switch gear output (2) can not get signal and quit work.
5, current-limiting protection formula solid-state relay according to claim 1; it is characterized in that applicable to single phase poaer supply and three phase mains; during three phase mains, the protection value that the electric current of any phase high tension loop surpass to be set can be cut off single-phase separately or three-phase cuts off simultaneously.
6, according to claim 1 or 2 or 3 or 4 or 5 described current-limiting protection formula solid-state relays; it is characterized in that described whole circuit can be encapsulated in the industrial box of standard solid state relay; insulation, curing glue fire-retardant, heat conduction can be made current-limiting protection formula solid-state relay in the filling, and wherein the box appearance is provided with LED light and adjustable resistance TR end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620051415 CN2912059Y (en) | 2006-06-18 | 2006-06-18 | Current limit protecting solid-state relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620051415 CN2912059Y (en) | 2006-06-18 | 2006-06-18 | Current limit protecting solid-state relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2912059Y true CN2912059Y (en) | 2007-06-13 |
Family
ID=38133923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620051415 Expired - Fee Related CN2912059Y (en) | 2006-06-18 | 2006-06-18 | Current limit protecting solid-state relay |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2912059Y (en) |
-
2006
- 2006-06-18 CN CN 200620051415 patent/CN2912059Y/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101227779A (en) | Insulation type general use illumination LED driving circuit | |
| CN202888081U (en) | AC contactor intelligent control apparatus with energy saving effect | |
| CN101667801A (en) | Excitation system of generator | |
| CN102647031B (en) | Direct-current power supply powered by current transformer | |
| CN102946106B (en) | Silicon controlled rectifier combination switch | |
| CN2912058Y (en) | Protecting solid-state relay with reset current limit | |
| CN101699686B (en) | Protection device of switch power supply and method thereof | |
| CN2912060Y (en) | Current limit protecting solid-state relay with combined instruction | |
| CN206136377U (en) | LED lighting supply source driver chip and drive circuit | |
| CN2907019Y (en) | Multi-functional current limiting protection solid-state relay | |
| CN2912059Y (en) | Current limit protecting solid-state relay | |
| CN205195230U (en) | Circuit in earthleakage protective equipment automation | |
| CN2932822Y (en) | Novel switch power circuit | |
| CN201037608Y (en) | LED energy-saving lamp device | |
| CN203406596U (en) | Under-voltage tripping device | |
| CN206341456U (en) | LED drive power and system | |
| CN109954956A (en) | A kind of IGBT inversion hand arc welding machine and its circuit structure | |
| CN205828277U (en) | A kind of relay | |
| CN201515338U (en) | Starter without power consumption for single-phase motor combined with overload protector | |
| CN201369555Y (en) | Short-circuit protection circuit of switching power supply for frequency converter | |
| CN212137973U (en) | Overcurrent protection circuit, LED lamp and lamp | |
| CN105895451A (en) | AC/DC universal intelligent contactor | |
| CN102651266B (en) | Control circuit of electromagnetic chuck | |
| CN106786013A (en) | Low-pressure multi-functional safeguard protection distribution box | |
| CN203340371U (en) | Low-power LED lamp driving power supply |
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: 20070613 Termination date: 20100618 |