CN201332391Y - Solid-state relay (SSR) for AC/DC overcurrent protection - Google Patents
Solid-state relay (SSR) for AC/DC overcurrent protection Download PDFInfo
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- CN201332391Y CN201332391Y CNU200820115691XU CN200820115691U CN201332391Y CN 201332391 Y CN201332391 Y CN 201332391Y CN U200820115691X U CNU200820115691X U CN U200820115691XU CN 200820115691 U CN200820115691 U CN 200820115691U CN 201332391 Y CN201332391 Y CN 201332391Y
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Abstract
The utility model discloses a solid-state relay (SSR) for AC/DC overcurrent protection, which belongs to the technical field of SSRs. The utility model aims to provide an SSR which can perform overcurrent protection to an AC/DC load current and automatically resumes normal work after the disappearance of the overcurrent of the load current. The SSR comprises an input circuit, a logic control circuit and an output circuit. The output circuit comprises a rectifying unit, a switch unit and a current sampling unit; and the logic control circuit comprises a start signal delay unit, a periodic signal generation unit, a combinational logic unit and an overcurrent protection unit. The switch unit and the current sampling unit are accessed to an output loop of the rectifying unit, and a load and a power supply for supplying power to the load are accessed to an AC input loop in series. The logic control circuit switches the on-and-off state of the switch unit, thereby realizing on-and-off switch and fast overcurrent protection to the AC/DC load current. The utility model can be extensively applied in industry and other fields in national economy.
Description
[technical field]
The utility model relates to a kind of solid-state relay, particularly relates to a kind of solid-state relay with overcurrent protection function.
[background technology]
Solid-state relay is compared with traditional mechanical relay, has that volume is little, contactless, switch speed is fast, do not have the advantage of arc erosion when switching, thereby is widely used in other field of industry and national economy.
The deficiency that known solid-state relay exists mainly is: no overcurrent protection function or current foldback circuit complexity, and can't be not only to AC load but also to DC load realization overcurrent protection.
For example, Chinese patent application number is 200510021484.9, and open day is on February 14th, 2007, and patent name is that the application case of " dc solid-state relay " discloses a kind of solid-state relay, and its weak point is only can realize overcurrent protection to DC load.
And for example, Chinese patent application number is 99115129.1, and open day is on March 22nd, 2000, and patent name is that the application case of " novel Universal AC/DC passive solid relay " discloses a kind of solid-state relay, and its weak point is non-loaded overcurrent protection function.
And for example; Chinese patent application number is 200520146647.1, and Granted publication day is on March 28th, 2007, and patent name is that the application case of " solid-state relay " discloses a kind of solid-state relay; its weak point is only can realize overcurrent protection and protective circuit complexity to AC load.
[summary of the invention]
Technical problem to be solved in the utility model is that providing a kind of can carry out overcurrent protection to the AC and DC load, can recover operate as normal automatically after the disappearance of load current overcurrent, and the simple solid-state relay of circuit structure.
For solving the problems of the technologies described above, a kind of solution unlike the prior art that the utility model provides is: 1) rectification unit, switch element and current sampling unit are set in the output circuit of solid-state relay, switch element and current sampling unit are connected in the direct current output loop of rectification unit, load and be connected in the ac input circuit of rectification unit with series system for the power supply of electric.2) the enabling signal delay unit is set in logic control circuit, the cyclical signal generation unit, combinatorial logic unit, over-current protecting unit, the output of current sampling unit links to each other with the input of logic control circuit, for it provides load current value.The output of logic control circuit links to each other with the control end of switch element, is used for the on off operating mode of diverter switch unit.
Output circuit of the present utility model comprises: rectification unit, switch element and current sampling unit.
Rectification unit is made of full-wave rectifier, and preferred rectification unit is the bridge full wave rectifier that the diode by low forward conduction voltage drop constitutes.
Switch element is made of the high speed electronic switch element, can be field effect transistor, double pole triode or insulated gate bipolar transistor.
The current sampling unit is made of current sensor, can be resistor, current transformer.Because constituting the electronic switching element of switch element can equivalence be resistor, so switch element also can doublely be done the current sampling unit.
The function of output circuit is: 1) will flow into load current commutation in the rectification unit input circuit and become direct current in the rectification unit output loop, this direct current flow through switch element and current sampling unit, the switching of diverter switch unit can the switch load electric current switching.2) during the load current overcurrent, the current sampling unit sends over-current signal to logic control circuit, by logic control circuit switch element is cut off.Because switch element is made of the high speed electronic switch element, be arranged in the direct current output loop of rectification unit, so can realize quick overcurrent protection.
Logic control circuit of the present utility model comprises: enabling signal delay unit, cyclical signal generation unit, combinatorial logic unit and over-current protecting unit.
The output signal of the output signal of input circuit, current sampling unit is the input signal of logic control circuit, and the output signal of logic control circuit is delivered to the control end of switch element.
The function of logic control circuit is: 1) load current during overcurrent, does not send the switching switching signal according to the output signal of input circuit to switch element.2) during the load current overcurrent, regularly send the conducting control signal, so that after the load current overcurrent disappeared, described AC/DC overcurrent protection solid-state relay can recover operate as normal automatically to switch element.
Known ac solid relay adopts bidirectional triode thyristor as switch element, directly the alternating current in the load is carried out switching and switches.Because controllable silicon can only turn-off when current over-zero, can't realize the quick shutoff under the overcurrent condition.Compare with known ac solid relay, the utlity model has overcurrent protection advantage timely.
Rectification unit, switch element and current sampling unit because the electric current in the DC load also can be flowed through, so the utility model also can carry out switching switching and overcurrent protection to the DC load electric current, this also is an advantage of the present utility model.
After the load current overcurrent disappeared, under the control of logic control circuit, described AC/DC overcurrent protection solid-state relay can recover operate as normal automatically, and this also is an advantage of the present utility model.
Feature of the present utility model and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
[description of drawings]
Fig. 1 is a circuit block diagram of the present utility model;
Fig. 2 is an output circuit block diagram of the present utility model;
Fig. 3 is the circuit diagram of first kind of embodiment of the present utility model;
Fig. 4 is the circuit diagram of second kind of embodiment of the present utility model.
[embodiment]
As shown in Figure 1, described AC/DC overcurrent protection solid-state relay comprises: input circuit 3, logic control circuit 4 and output circuit 5.Load and power supply insert terminal 6 and terminal 7 with series system, and whether described AC/DC overcurrent protection solid-state relay is according to having direct current to flow into through terminal 1, and terminal 2 flows out the switching of switch load electric current.
As shown in Figure 2, the output circuit of described AC/DC overcurrent protection solid-state relay comprises: switch element 11, current sampling unit 12 and rectification unit 13.The load current that flows into rectification units 13 by terminal 6, terminal 7 becomes direct current in the output loop of rectification unit 13, this direct current flow through switch element 11 and current sampling unit 12.When the load current overcurrent, terminal 9 and terminal 10 be to logic control circuit 4 output load current over-current signals, by the output signal of the logic control circuit 4 of terminal 8 inputs switch element 11 cut off.
Now first kind of embodiment shown in Figure 3 is elaborated.
Input circuit comprises: terminal 1, terminal 2, photoelectricity are isolated triode 14 and resistor 15.Resistor 15 is the output of input circuit with the tie point that photoelectricity is isolated triode 14.Flow into through terminal 1 as direct current, when terminal 2 flows out, input circuit output high level, otherwise, output low level.
Logic control circuit comprises: enabling signal delay unit, cyclical signal generation unit, combinatorial logic unit and over-current protecting unit.
The enabling signal delay unit is made of inverter 16, resistor 17, capacitor 18 and inverter 19.Its input is the input of inverter 16, and its output is the output of inverter 19.Its function is, with the output signal time-delay of input circuit.
The cyclical signal generation unit is made of inverter 25, capacitor 26 and resistor 27.Its output is the output of inverter 25.Its function is that the generation periodic square wave signal is sent into combinatorial logic unit.
Combinatorial logic unit is made of two input NAND gate 20, two input NAND gate 21, two input NAND gate 22, two input NAND gate 23 and inverter 24.The input of combinatorial logic unit is: the input of the input of the input of two input NAND gate 20, two input NAND gate 21, the input of two input NAND gate 22, inverter 24.The output of combinatorial logic unit is: the output of two input NAND gate 23.The function of combinatorial logic unit is: 1), according to the output state of input circuit, reset or enabling signal to the output of the On of overcurrent protection integrated circuit 28 pin not under the normal condition of overcurrent at load current, reset signal is a low level, and enabling signal is a high level.2) when load current overcurrent and input circuit output high level; periodically reset and enabling signal to the output of the On of overcurrent protection integrated circuit 28 pin; so that the Gate pin of overcurrent protection integrated circuit 28 is periodically exported moment high level and low level; eliminate up to the load current overcurrent, the Gate pin of overcurrent protection integrated circuit 28 rests on high level.3) when load current overcurrent and input circuit output low level, to the On of overcurrent protection integrated circuit 28 pin output reset signal.
The function of combinatorial logic unit can be used logical formula description down:
On＝Start(Protection+Second)
Protection＝Startdelay·Ready
Logical variable in last two formulas is described as follows:
Start is the output signal of input circuit; put on the input of enabling signal delay unit and the input of combinatorial logic unit; Start is that high level represents to require described AC/DC overcurrent protection solid-state relay to connect load; otherwise then expression requires described AC/DC overcurrent protection solid-state relay to cut off load.
Second is the output signal of cyclical signal generation unit, puts on the input of combinatorial logic unit, after the load current overcurrent protection, overcurrent protection integrated circuit 28 is entered reset and starting state usefulness.
Startdelay is the output signal of enabling signal delay unit, puts on the input of combinatorial logic unit, uses for forming load current overcurrent protection signal Protection.
Ready is the output signal of the Ready pin of overcurrent protection integrated circuit 28, puts on the input of combinatorial logic unit.When the On pin of overcurrent protection integrated circuit 28 becomes high level, after the short time time-delay, the Ready pin output high level of overcurrent protection integrated circuit 28, promptly the Ready signal is a high level, the expression load current is overcurrent not.When if the On pin of overcurrent protection integrated circuit 28 becomes high level, after the short time time-delay, the Ready pin output low level of overcurrent protection integrated circuit 28, promptly the Ready signal is a low level, then represents the load current overcurrent.
Protection is the overcurrent protection signal, is the intermediate logic variable, when it is high level, and expression load current overcurrent, otherwise, then represent not overcurrent of load current.
On is the output signal of combinatorial logic unit, delivers to the On pin of overcurrent protection integrated circuit 28, when it is low level, requires overcurrent protection integrated circuit 28 to reset, otherwise, then require overcurrent protection integrated circuit 28 to start.
Over-current protecting unit is made of overcurrent protection integrated circuit 28.Overcurrent protection integrated circuit 28 is for insulting the LTC4213 overcurrent protection integrated circuit (IC) chip that Li Erte (LINEARTECHNOLOGY) company makes.Now its function is described in conjunction with Fig. 3.
1) gathers the voltage on the resistor 30 by Sensep, Sensen pin, voltage between Sensep, Sensen pin is during less than the value of setting, judge the electric current overcurrent not in the resistor 30 of flowing through, voltage between Sensep, Sensen pin is judged the overcurrent in the resistor 30 of flowing through during greater than the value of setting.
2) when the On pin is high level, overcurrent protection integrated circuit 28 starts, if the overcurrent not of the electric current in the resistor 30 of flowing through, and Gate pin output high level and keep high level, field effect transistor 29 conductings then.
3) when the On pin is high level, overcurrent protection integrated circuit 28 starts, if the overcurrent in this moment resistor 30, then the output of Gate pin transfers low level to by high level, and field effect transistor 29 is turn-offed.
When 4) On was low level, the internal circuit of LTC4213 resetted, Gate pin output low level, and field effect transistor 29 is turn-offed.
5) during the overcurrent in the resistor 30, Ready pin output low level, the electric current in the resistor 30 is during overcurrent, Ready pin output high level.The Ready pin provides the normal and over-current state of electric current in the resistor 30 of flowing through to combinatorial logic unit.
6) by the Isel pin is received high level, low level or suspension, the overcurrent protection value of electric current in the resistor 30 of flowing through is set.
7) Vcc, Gnd pin are respectively power supply pin and power supply reference edge pin.
Switch element is made of field effect transistor 29.Its function is to switch the switching state of load current under the control of the Gate of overcurrent protection integrated circuit 28 pin output signal.
The current sampling unit is made of resistor 30.Its function is to convert load current signal to voltage signal.
Rectification unit comprises diode 31, diode 32, diode 33 and diode 34.These four diodes constitute full wave bridge rectifier.Load and for the power supply of its power supply is connected on series system in the ac input circuit of full wave bridge rectifier, field effect transistor 29 and resistor 30 are connected in the direct current output loop of full wave bridge rectifier with series system.The rectification unit function is to convert load current to direct current and be sent to switch element 11 and current sampling unit 12.
Terminal 35 is external power supply end, and terminal 36 is external power supply reference edge.External dc power is by input circuit 3 and logic control circuit 4 power supplies of this two-terminal to described AC/DC overcurrent protection solid-state relay.
Now second kind of embodiment shown in Figure 4 is elaborated.
Input circuit comprises: terminal 1, terminal 2, photoelectricity are isolated triode 14 and resistor 15.Resistor 15 is the output of input circuit with the tie point that photoelectricity is isolated triode 14.Flow into through terminal 1 as direct current, when terminal 2 flows out, input circuit output high level, otherwise, output low level.
Logic control circuit comprises: enabling signal delay unit, cyclical signal generation unit, combinatorial logic unit and over-current protecting unit.
The enabling signal delay unit is made of inverter 16, resistor 17, capacitor 18 and inverter 19.Its input is the input of inverter 16, and its output is the output of inverter 19.Its function is, with the output signal time-delay of input circuit.
The cyclical signal generation unit is made of inverter 25, capacitor 26 and resistor 27.Its output is the output of inverter 25.Its function is that the generation periodic square wave signal is sent into combinatorial logic unit.
Combinatorial logic unit is made of two input NAND gate 20, two input NAND gate 21, two input NAND gate 22, two input NAND gate 23 and inverter 24.The input of combinatorial logic unit is: the input of the input of the input of two input NAND gate 20, two input NAND gate 21, the input of two input NAND gate 22, inverter 24.The output of combinatorial logic unit is: the output of two input NAND gate 23.The function of combinatorial logic unit is: 1), according to the output state of input circuit, reset or enabling signal to the output of the On of overcurrent protection integrated circuit 28 pin not under the normal condition of overcurrent at load current, reset signal is a low level, and enabling signal is a high level.2) when load current overcurrent and input circuit output high level; periodically reset and enabling signal to the output of the On of overcurrent protection integrated circuit 28 pin; so that the Gate pin of overcurrent protection integrated circuit 28 is periodically exported moment high level and low level; eliminate up to the load current overcurrent, the Gate pin of overcurrent protection integrated circuit 28 rests on high level.3) when load current overcurrent and input circuit output low level, to the On of overcurrent protection integrated circuit 28 pin output reset signal.
The function of combinatorial logic unit can be used logical formula description down:
On＝Start(Protection+Second)
Protection＝Startdelay·Ready
Logical variable in last two formulas is described as follows:
Start is the output signal of input circuit; put on the input of enabling signal delay unit and the input of combinatorial logic unit; Start is that high level represents to require described AC/DC overcurrent protection solid-state relay to connect load; otherwise then expression requires described AC/DC overcurrent protection solid-state relay to cut off load.
Second is the output signal of cyclical signal generation unit, puts on the input of combinatorial logic unit, after the load current overcurrent protection, overcurrent protection integrated circuit 28 is entered reset and starting state usefulness.
Startdelay is the output signal of enabling signal delay unit, puts on the input of combinatorial logic unit, uses for forming load current overcurrent protection signal Protection.
Ready is the output signal of the Ready pin of overcurrent protection integrated circuit 28, puts on the input of combinatorial logic unit.When the On pin of overcurrent protection integrated circuit 28 becomes high level, after the short time time-delay, the Ready pin output high level of overcurrent protection integrated circuit 28, promptly the Ready signal is a high level, the expression load current is overcurrent not.When if the On pin of overcurrent protection integrated circuit 28 becomes high level, after the short time time-delay, the Ready pin output low level of overcurrent protection integrated circuit 28, promptly the Ready signal is a low level, then represents the load current overcurrent.
Protection is the overcurrent protection signal, is the intermediate logic variable, when it is high level, and expression load current overcurrent, otherwise, then represent not overcurrent of load current.
On is the output signal of combinatorial logic unit, delivers to the On pin of overcurrent protection integrated circuit 28, when it is low level, requires overcurrent protection integrated circuit 28 to reset, otherwise, then require overcurrent protection integrated circuit 28 to start.
Over-current protecting unit is made of overcurrent protection integrated circuit 28.Overcurrent protection integrated circuit 28 is for insulting the LTC4213 overcurrent protection integrated circuit (IC) chip that Li Erte (LINEARTECHNOLOGY) company makes.Now its function is described in conjunction with Fig. 4.
1) by the voltage between Sensep, 29 drain electrodes of Sensen pin collection field effect transistor, source electrode, voltage between Sensep, Sensen pin is during less than the value of setting, judge the electric current overcurrent not in the field effect transistor 29 of flowing through, voltage between Sensep, Sensen pin is judged the overcurrent in the field effect transistor 29 of flowing through during greater than the value of setting.
2) when the On pin is high level, overcurrent protection integrated circuit 28 starts, if the overcurrent not of the electric current in the field effect transistor 29 of flowing through, and Gate pin output high level and keep high level, field effect transistor 29 conductings then.
3) when the On pin is high level, overcurrent protection integrated circuit 28 starts, if the overcurrent in this moment field effect transistor 29, then the output of Gate pin transfers low level to by high level, and field effect transistor 29 is turn-offed.
When 4) On was low level, the internal circuit of LTC4213 resetted, Gate pin output low level, and field effect transistor 29 is turn-offed.
5) during the overcurrent in the field effect transistor 29, Ready pin output low level, during overcurrent in the field effect transistor 29, Ready pin output high level.The Ready pin provides the normal and over-current state of electric current in the field effect transistor 29 of flowing through to combinatorial logic unit.
6) by the Isel pin is received high level, low level or suspension, the overcurrent protection value of electric current in the field effect transistor 29 of flowing through is set.
7) Vcc, Gnd pin are respectively power supply pin and power supply reference edge pin.
Switch element is made of field effect transistor 29.Its function is to switch the switching state of load current under the control of the Gate of overcurrent protection integrated circuit 28 pin output signal.
The current sampling unit is made of field effect transistor 29.Its function is to convert load current signal to voltage signal.
Rectification unit comprises diode 31, diode 32, diode 33 and diode 34.These four diodes constitute full wave bridge rectifier.Load and for the power supply of its power supply is connected on series system in the ac input circuit of full wave bridge rectifier, field effect transistor 29 is connected in the direct current output loop of full wave bridge rectifier.The rectification unit function is to convert load current to direct current and be sent to switch element 11 and current sampling unit 12.Switch element, current sampling unit constitute by field effect transistor 29 among this figure.
Terminal 35 is external power supply end, and terminal 36 is external power supply reference edge.External dc power is by input circuit 3 and logic control circuit 4 power supplies of this two-terminal to described AC/DC overcurrent protection solid-state relay.
Claims (10)
1. AC/DC overcurrent protection solid-state relay; by input circuit (3); logic control circuit (4) and output circuit (5) three parts are formed; feature of the present utility model is; described output circuit (5) comprises rectification unit (13); switch element (11) and current sampling unit (12); load and be connected in the ac input circuit of described rectification unit (13) with series system for the power supply of electric; described switch element (11) is connected in the direct current output loop of described rectification unit (13); be used for the logical of switch load electric current; disconnected; described current sampling unit (12) is connected in the direct current output loop of described rectification unit (13); the output of described logic control circuit (4) links to each other with the control end of described switch element (11), is used to switch the logical of described switch element (11); disconnected state.
2. AC/DC overcurrent protection solid-state relay according to claim 1; it is characterized in that; two external terminals (6) of described output circuit (5); (7) be two ac input ends of described rectification unit (13) respectively; load and two external terminals (6) that are connected on described output circuit (5) for the power supply of electric with series system; (7) between; the control end (8) that an input of described output circuit (5) is described switch element (11); link to each other with the output of described logic control circuit (4); two outputs (9) of described output circuit (5); (10) be two outputs of described current sampling unit (12); link to each other with two inputs of described logic control circuit (4), be used for providing load current signal to described logic control circuit (4).
3. AC/DC overcurrent protection solid-state relay according to claim 1; it is characterized in that; described logic control circuit (4) comprises enabling signal delay unit, cyclical signal generation unit, combinatorial logic unit and over-current protecting unit; an input of described logic control circuit (4) links to each other with the output of described input circuit (3); two other input of described logic control circuit (4) links to each other with two outputs of described output circuit (5), and the output of described logic control circuit (4) links to each other with the input of described output circuit (5).
4. AC/DC overcurrent protection solid-state relay according to claim 1 and 2; it is characterized in that; described rectification unit (13) is made of full-wave rectifier; load and be connected in the ac input circuit of full-wave rectifier with series system for the power supply of electric; described switch element (11) is connected in the direct current output loop of described full-wave rectifier, and described current sampling unit (12) is connected in the direct current output loop of described full-wave rectifier.
5. AC/DC overcurrent protection solid-state relay according to claim 1 and 2; it is characterized in that; described switch element (11) is made of electronic switching element; be connected in the direct current output loop of described rectification unit (13), the control end of described electronic switching element links to each other with the output of described logic control circuit (4).
6. AC/DC overcurrent protection solid-state relay according to claim 1 and 2; it is characterized in that; described current sampling unit (12) is made of current sensor; be used for detecting the electric current of the direct current output loop of described rectification unit (13), the output of described current sensor links to each other with the input of described logic control circuit (4).
7. AC/DC overcurrent protection solid-state relay according to claim 1 and 2; it is characterized in that; described current sampling unit (12) is made of the electronic switching element in the described switch element (11); be connected in the direct current output loop of described rectification unit (13), the dc output end of described rectification unit (13) be exactly described electronic switching element be the output of described current sampling unit (12).
8. AC/DC overcurrent protection solid-state relay according to claim 1 and 2; it is characterized in that; described current sampling unit (12) is made of resistor; described resistor and described switch element (11) are connected on series system in the direct current output loop of described rectification unit (13), and the two ends of described resistor are exactly the output of described current sampling unit (12).
9. according to claim 1 or 3 described AC/DC overcurrent protection solid-state relays, it is characterized in that described cyclical signal generation unit is made of oscillator, be used for when the load overcurrent, producing and reset and enabling signal.
10. according to claim 1 or 3 described AC/DC overcurrent protection solid-state relays, it is characterized in that described over-current protecting unit is made of overcurrent protection integrated circuit (28).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820115691XU CN201332391Y (en) | 2008-11-27 | 2008-11-27 | Solid-state relay (SSR) for AC/DC overcurrent protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820115691XU CN201332391Y (en) | 2008-11-27 | 2008-11-27 | Solid-state relay (SSR) for AC/DC overcurrent protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201332391Y true CN201332391Y (en) | 2009-10-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200820115691XU Expired - Fee Related CN201332391Y (en) | 2008-11-27 | 2008-11-27 | Solid-state relay (SSR) for AC/DC overcurrent protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201332391Y (en) |
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2008
- 2008-11-27 CN CNU200820115691XU patent/CN201332391Y/en not_active Expired - Fee Related
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| 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: 20091021 Termination date: 20111127 |