CN214959480U - Direct current solid-state relay with short-circuit protection - Google Patents
Direct current solid-state relay with short-circuit protection Download PDFInfo
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- CN214959480U CN214959480U CN202121404613.3U CN202121404613U CN214959480U CN 214959480 U CN214959480 U CN 214959480U CN 202121404613 U CN202121404613 U CN 202121404613U CN 214959480 U CN214959480 U CN 214959480U
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Abstract
The utility model relates to a direct current solid-state relay with short-circuit protection, which comprises a power module and a power module, wherein the power module is used for providing electric energy for the solid-state relay; the MOS switch modules are used for controlling the switching of the MOS tubes; the switching module is used for switching the output state of the solid-state relay; the surge absorption module is used for absorbing high surge voltage generated by a source electrode and a drain electrode when the circuit is cut off; the power supply module is connected with one end of the MOS switch module, the other end of the MOS switch module is connected with one end of the surge absorption module, and the other end of the surge absorption module is connected with the switching module; the utility model provides a technical scheme, the high surge voltage that source electrode and drain electrode produced when can the absorption circuit by avoids MOS pipe overcurrent or overvoltage damage, realizes solid state relay's self-protection.
Description
Technical Field
The utility model belongs to the technical field of the relay, concretely relates to take short-circuit protection's direct current solid state relay.
Background
With the development of modern technology, various new mechanical equipment and various new devices are developed. The control of mechanical devices is particularly important. Solid state relays in particular have wide application in switching control. Since 1971, Kudom solid state relay technology came into existence in the united kingdom, ac and dc solid state relays have performed better and better through original components and technological improvements, but the overall circuit diagram has not changed significantly.
In the related art, in the use process of the solid-state relay, if a load is short-circuited once, a common MOS (metal oxide semiconductor) tube or controllable silicon in the solid-state relay is over-current and over-voltage damaged, a serious person may cause a fire, and the problem that the use safety of the solid-state relay cannot be guaranteed exists.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at overcoming the not enough of prior art, provide a take short-circuit protection's direct current solid state relay to solve the problem that solid state relay safety in use can not be ensured among the prior art.
In order to realize the above purpose, the utility model adopts the following technical scheme: a dc solid state relay with short circuit protection, comprising:
the power supply module is used for providing electric energy for the solid-state relay;
the MOS switch module is used for controlling the switch of the MOS tube;
the switching module is used for switching the output state of the solid-state relay;
the surge absorption module is used for absorbing high surge voltage generated by a source electrode and a drain electrode when the circuit is cut off;
the power module is connected with one end of the MOS switch module, the other end of the MOS switch module is connected with one end of the surge absorption module, and the other end of the surge absorption module is connected with the switching module.
Further, the power module includes:
the rectifier bridge is used for converting alternating current into direct current;
the voltage stabilizing tube is used for stabilizing voltage;
and the voltage comparator is used for comparing the voltage value with a preset threshold value, and conducting the circuit when the voltage value is higher than the preset threshold value.
Further, the switching module includes:
a start circuit for starting a positive pulse;
a state holding circuit for holding a high level output;
the buffer circuit is used for amplifying the buffer current from the high level through a resistor R3 and then forming a totem pole through a triode to output the high level;
and the fault detection circuit is used for detecting the short-circuit current signal and controlling the state holding circuit to output a low level according to the short-circuit current signal.
Further, the surge absorption module includes:
and the absorption circuit is used for absorbing the surge voltage.
Further, the MOS switch module includes two MOS transistors.
Further, the start-up circuit includes:
the power supply circuit comprises a capacitor C1, a resistor R1 and a differential amplifier U1D, wherein one end of the capacitor C1 and one end of the resistor R1 are connected with the positive input end of the differential amplifier U1D, the other end of the capacitor C1 is connected with the input end of the power supply module, the other end of the resistor R1 is grounded, and the output end of the differential amplifier U1D is connected with the MOS switch module.
Further, the fault detection circuit includes:
differential amplifier U1C.
Further, the power module adopts a rechargeable battery.
The utility model adopts the above technical scheme, the beneficial effect that can reach includes:
through setting up power module, MOS switch module, switching module and surge absorption module, can realize the high surge voltage that absorption circuit produced source electrode and drain electrode when ending, avoid MOS pipe overcurrent or overvoltage damage, realize solid state relay's self protection.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is an electronic circuit diagram of a power module provided by the present invention;
fig. 2 is an electronic circuit diagram of a switching module provided by the present invention;
fig. 3 is an electronic circuit diagram of the surge absorption module provided by the present invention
Fig. 4 is an electronic circuit diagram of the MOS switch module provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
A specific dc solid-state relay with short-circuit protection provided in the embodiments of the present application is described below with reference to the accompanying drawings.
The direct-current solid-state relay with the short-circuit protection provided by the embodiment of the application comprises a relay body;
the power supply module is used for providing electric energy for the solid-state relay;
the MOS switch module is used for controlling the switch of the MOS tube;
the switching module is used for switching the output state of the solid-state relay;
the surge absorption module is used for absorbing high surge voltage generated by a source electrode and a drain electrode when the circuit is cut off;
the power module is connected with one end of the MOS switch module, the other end of the MOS switch module is connected with one end of the surge absorption module, and the other end of the surge absorption module is connected with the switching module.
Preferably, the power module includes:
the rectifier bridge is used for converting alternating current into direct current;
the voltage stabilizing tube is used for stabilizing voltage;
and the voltage comparator is used for comparing the voltage value with a preset threshold value, and conducting the circuit when the voltage value is higher than the preset threshold value.
As shown in FIG. 1, the power module is used for controlling the power supply of the solid-state relay and controlling the port, and the circuit can work in a 12-100VAC or DC range to output two 12V outputs for supplying power to the main circuit and the switch circuit of the 2 nd path. A J1 and J2 input 12-100VAC or DC control power supply is guided by a rectifier bridge and then charges CA1, when the charging voltage is more than 11V, the negative electrode has breakdown current through R15 and D10(10V) voltage-regulator tubes to QA3 base electrode conduction circuit for starting. The voltage comparator compares the input voltage value with a preset threshold value, wherein the preset threshold value is 11V, namely the working state is unstable when the input voltage is lower than 11V. Therefore, the switching circuit does not operate when the input voltage is lower than 11V or less.
Preferably, the switching module includes:
a start circuit for starting a positive pulse;
a state holding circuit for holding a high level output;
the buffer circuit is used for amplifying the buffer current from the high level through a resistor R3 and then forming a totem pole through a triode to output the high level;
and the fault detection circuit is used for detecting the short-circuit current signal and controlling the state holding circuit to output a low level according to the short-circuit current signal.
As shown in FIG. 2, C1, R1 and U1D form a start circuit, and a 1mS start positive pulse is output from the output end of the circuit power-on U1D to enable the state holding circuit to keep high-level output all the time through the positive input end of the state holding circuit formed by D1 to U1A and R8. The output high level passes through R3 to the buffer circuit, so that the buffer current is amplified, forms a totem-pole output high level through Q3 and Q4, and then passes through the MOS switch module after being driven. U1C is a fault detection circuit, once a strong short-circuit current signal appears on the output switch part, the output end outputs a negative pulse through the negative input end of R14 to U1C, the state holding circuit part outputs a low level and then is cut off through the MOS switch module.
Preferably, the surge absorption module includes:
and the absorption circuit is used for absorbing the surge voltage.
As shown in fig. 3, the rear MOS switch modules U7 and U8 form an output switch circuit, when the circuit is turned off, U7 is turned off before U8, and a high surge voltage is generated across the source and drain of U7, which is even tens of times higher than the control voltage, and can directly break down the U7MOS switch module. In order to prevent the surge voltage from being too high and increase the absorption circuit, the absorption circuit is composed of D5, C3 and C4. The absorbed voltage can absorb the too high surge voltage, places the condition that the circuit appears leaking electricity, and the protection circuit safety.
Preferably, the MOS switch module includes two MOS transistors.
As shown in fig. 4, in the present application, the MOS switch modules U7 and U8 form a series of equivalent right K1K2 circuits.
To sum up, the utility model provides a direct current solid-state relay with short circuit protection, which comprises a power module for providing electric energy for the solid-state relay; the MOS switch modules are used for controlling the switching of the MOS tubes; the switching module is used for switching the output state of the solid-state relay; the surge absorption module is used for absorbing high surge voltage generated by a source electrode and a drain electrode when the circuit is cut off; the power supply module is connected with one end of the MOS switch module, the other end of the MOS switch module is connected with one end of the surge absorption module, and the other end of the surge absorption module is connected with the switching module; the utility model provides a technical scheme, the high surge voltage that source electrode and drain electrode produced when can the absorption circuit by avoids MOS pipe overcurrent or overvoltage damage, realizes solid state relay's self-protection.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The utility model provides a take short-circuit protection's direct current solid state relay which characterized in that includes:
the power supply module is used for providing electric energy for the solid-state relay;
the MOS switch module is used for controlling the switch of the MOS tube;
the switching module is used for switching the output state of the solid-state relay;
the surge absorption module is used for absorbing high surge voltage generated by a source electrode and a drain electrode when the circuit is cut off;
the power module is connected with one end of the MOS switch module, the other end of the MOS switch module is connected with one end of the surge absorption module, and the other end of the surge absorption module is connected with the switching module.
2. The direct current solid state relay with short circuit protection of claim 1, wherein the power module comprises:
the rectifier bridge is used for converting alternating current into direct current;
the voltage stabilizing tube is used for stabilizing voltage;
and the voltage comparator is used for comparing the voltage value with a preset threshold value, and conducting the circuit when the voltage value is higher than the preset threshold value.
3. The direct current solid state relay with short circuit protection of claim 1, wherein the switching module comprises:
a start circuit for starting a positive pulse;
a state holding circuit for holding a high level output;
the buffer circuit is used for amplifying the buffer current from the high level through a resistor R3 and then forming a totem pole through a triode to output the high level;
and the fault detection circuit is used for detecting the short-circuit current signal and controlling the state holding circuit to output a low level according to the short-circuit current signal.
4. The direct current solid state relay with short circuit protection of claim 1, wherein the surge absorbing module comprises:
and the absorption circuit is used for absorbing the surge voltage.
5. The direct current solid-state relay with short circuit protection according to claim 1, wherein the MOS switch module comprises two MOS transistors.
6. The direct current solid state relay with short circuit protection of claim 3, wherein the start circuit comprises:
the power supply circuit comprises a capacitor C1, a resistor R1 and a differential amplifier U1D, wherein one end of the capacitor C1 and one end of the resistor R1 are connected with the positive input end of the differential amplifier U1D, the other end of the capacitor C1 is connected with the input end of the power supply module, the other end of the resistor R1 is grounded, and the output end of the differential amplifier U1D is connected with the MOS switch module.
7. The direct current solid state relay with short circuit protection of claim 3, wherein the fault detection circuit comprises:
differential amplifier U1C.
8. The direct current solid-state relay with short-circuit protection according to any one of claims 1 to 7,
the power module adopts a rechargeable battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121404613.3U CN214959480U (en) | 2021-06-23 | 2021-06-23 | Direct current solid-state relay with short-circuit protection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121404613.3U CN214959480U (en) | 2021-06-23 | 2021-06-23 | Direct current solid-state relay with short-circuit protection |
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| Publication Number | Publication Date |
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| CN214959480U true CN214959480U (en) | 2021-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121404613.3U Active CN214959480U (en) | 2021-06-23 | 2021-06-23 | Direct current solid-state relay with short-circuit protection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113242033A (en) * | 2021-06-23 | 2021-08-10 | 南宫市伟禄电子科技有限公司 | Direct current solid-state relay with short-circuit protection |
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2021
- 2021-06-23 CN CN202121404613.3U patent/CN214959480U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113242033A (en) * | 2021-06-23 | 2021-08-10 | 南宫市伟禄电子科技有限公司 | Direct current solid-state relay with short-circuit protection |
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