CN215452497U - Over-voltage and under-voltage protection circuit for drying machine - Google Patents
Over-voltage and under-voltage protection circuit for drying machine Download PDFInfo
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- CN215452497U CN215452497U CN202121044905.0U CN202121044905U CN215452497U CN 215452497 U CN215452497 U CN 215452497U CN 202121044905 U CN202121044905 U CN 202121044905U CN 215452497 U CN215452497 U CN 215452497U
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Abstract
The utility model provides an over-voltage and under-voltage protection circuit for a dryer, which comprises a main control module, a first controlled switch module, a second controlled switch module, a high-voltage trigger protection module and a low-voltage trigger protection module, wherein the first controlled switch module is used for controlling the on-off of a power supply of a fan module of the dryer, the second controlled switch module is used for controlling the on-off of a power supply of an electric heating module of the dryer, the high-voltage trigger protection module is used for controlling the first controlled switch module and the second controlled switch module to be disconnected when the detection power supply output end of the dryer is over-voltage, and the low-voltage trigger protection module is used for controlling the first controlled switch module and the second controlled switch module to be disconnected when the detection power supply output end is under-voltage. The over-voltage and under-voltage protection circuit for the drying machine solves the problems that heating devices, motors and other electric appliances are easy to damage in the operation of the existing drying machine due to the fact that a client is connected with a wrong line and pulse voltage is generated to a power grid when other high-power equipment works, maintenance cost is increased, and production efficiency is influenced.
Description
Technical Field
The utility model relates to the technical field of electronic circuits, in particular to an over-voltage and under-voltage protection circuit for a dryer.
Background
At present, when a common dryer in the market is used on site, the phenomenon that electric appliances such as a heating device, an alternating current controller, a motor, an indicator lamp and the like are easily damaged in the working process of equipment due to the fact that a client is frequently connected with a wrong line and the pulse voltage is generated to a power grid when other high-power equipment works generally exists, so that the maintenance cost is increased, and the production efficiency is influenced to a certain extent.
Therefore, it is desirable to provide an over-voltage and under-voltage protection circuit for a dryer to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
The utility model mainly solves the technical problem of providing an over-voltage and under-voltage protection circuit for a dryer, solves the problem that electric appliances such as a heating device, an alternating current controller, a motor, an indicator light and the like are easy to damage in the operation of equipment due to the common occurrence of wrong connection of a client and pulse voltage generated by other high-power equipment to a power grid when the existing dryer is used, not only increases the maintenance cost, but also influences the production efficiency to a certain extent, can effectively prolong the service life of a product, simultaneously reduce the maintenance reject ratio and improve the use efficiency of client production equipment.
In order to solve the technical problems, one technical scheme adopted by the utility model is to provide an over-voltage and under-voltage protection circuit for a dryer, which comprises a main control module 1, a first controlled switch module 3 for controlling the on-off of a power supply of a dryer fan module 2, a second controlled switch module 5 for controlling the on-off of a power supply of an electric heating module 4 of the dryer, a high-voltage trigger protection module 6 for controlling the first controlled switch module 3 and the second controlled switch module 5 to be disconnected when the detection power supply output end of the dryer power supply is over-voltage, and a low-voltage trigger protection module 7 for controlling the first controlled switch module 3 and the second controlled switch module 5 to be disconnected when the detection power supply output end is under-voltage;
the switch control signal input end of the first controlled switch module 3 is respectively and electrically connected with the main control module 1, the high-voltage trigger protection module 6 and the low-voltage trigger protection module 7, and the control signal input end of the second controlled switch module 5 is respectively and electrically connected with the main control module 1, the high-voltage trigger protection module 6 and the low-voltage trigger protection module 7.
In the examples, it is preferred that:
be equipped with in the high pressure trigger protection module 6 and be used for detecting triode Q1 that switches on when power output end excessive pressure, triode Q1's collecting electrode electricity respectively connect first controlled switch module 3's control signal input with the control signal input of second controlled switch module 5, triode Q1's projecting pole ground connection, triode Q1's base connects resistance R1's one end, resistance R1's another termination detect power output end, it has resistance R2 to connect between triode Q1's projecting pole and the base.
In the examples, it is preferred that:
a triode Q2 used for being cut off when the output end of the detection power supply is undervoltage and a triode Q3 used for being conducted when the output end of the detection power supply is undervoltage are arranged in the low-voltage trigger protection module 7;
the collector of the triode Q2 is connected with the base of the triode Q3, the emitter of the triode Q2 is grounded, the base of the triode Q2 is connected with one end of a resistor R3, the other end of the resistor R3 is connected with the output end of the detection power supply, and a resistor R4 is connected between the emitter and the base of the triode Q2;
the collecting electrode electricity of triode Q3 connect respectively first controlled switch module 3's control signal input with the control signal input of second controlled switch module 5, triode Q3's emitter ground, triode Q3's base is connected with the one end of resistance R5, another termination circuit voltage VCC output of resistance R5.
In the examples, it is preferred that:
a first relay switch circuit 31 for controlling the on-off of the power supply of the dryer fan module 2 and a first relay coil circuit 32 for controlling the on-off of the first relay switch circuit 31 are arranged in the first controlled switch module 3;
the control signal input end of the first relay coil circuit 32 is electrically connected with the main control module 1, the high-voltage trigger protection module 6 and the low-voltage trigger protection module 7 respectively.
In the examples, it is preferred that:
a relay coil K1 and a triode Q5 for controlling the on-off of the relay coil K1 are arranged in the first relay coil circuit 32;
the collector of the triode Q5 is electrically connected to the relay coil K1, the emitter of the triode Q5 is grounded, and the base of the triode Q5 is used as the control signal input terminal of the first relay coil circuit 32 to be electrically connected to the main control module 1, the high voltage trigger protection module 6 and the low voltage trigger protection module 7, respectively.
In the examples, it is preferred that:
a second relay switch circuit 51 for controlling the on-off of the power supply of the electromechanical module 4 of the drying machine and a second relay coil circuit 52 for controlling the on-off of the second relay switch circuit 51 are arranged in the second controlled switch module 5;
the control signal input end of the second relay coil circuit 52 is electrically connected to the main control module 1, the high-voltage trigger protection module 6 and the low-voltage trigger protection module 7 respectively.
In the examples, it is preferred that:
a relay coil K2, a triode Q4 for controlling the on-off of the relay coil K2, a freewheeling diode D5 for preventing voltage and current from suddenly changing to protect the triode Q4 and a capacitor C4 for absorbing surge voltage to protect the freewheeling diode D5 are arranged in the second relay coil circuit 52;
the freewheeling diode D5 is connected in parallel to two ends of the relay coil K2, the capacitor C4 is connected in parallel to two ends of the freewheeling diode D5, the collector of the triode Q4 is electrically connected to the relay coil K2, the emitter of the triode Q4 is grounded, and the base of the triode Q4 is used as the control signal input end of the second relay coil circuit 52 and is electrically connected to the main control module 1, the high-voltage trigger protection module 6 and the low-voltage trigger protection module 7, respectively.
The utility model has the beneficial effects that: the over-voltage and under-voltage protection circuit for the drying machine solves the problem that electric appliances such as a heating device, an alternating current controller, a motor, an indicator lamp and the like are easy to damage in the working process of the existing drying machine due to the fact that a client is connected with a wrong line and pulse voltage is generated to a power grid when other high-power equipment works when the existing drying machine is used, not only increases the maintenance cost, but also influences the production efficiency to a certain extent, can effectively prolong the service life of a product, simultaneously reduce the maintenance reject ratio and improve the use efficiency of client production equipment.
Drawings
FIG. 1 is a schematic diagram of a circuit structure of an over-voltage and under-voltage protection circuit for a dryer according to the present invention;
fig. 2 is a schematic diagram of a dryer power supply for an over-voltage and under-voltage protection circuit of a dryer according to the present invention.
Detailed Description
The technical solution of the present invention will be described in detail with reference to the drawings.
Referring to fig. 1, the overvoltage and undervoltage protection circuit for a dryer of the present embodiment includes a main control module 1, a first controlled switch module 3 for controlling on/off of a power supply of a dryer fan module 2, a second controlled switch module 5 for controlling on/off of a power supply of a dryer electromechanical thermal module 4, a high voltage trigger protection module 6 for controlling the first controlled switch module 3 and the second controlled switch module 5 to be disconnected when a power supply output end of a dryer power supply detects overvoltage, and a low voltage trigger protection module 7 for controlling the first controlled switch module 3 and the second controlled switch module 5 to be disconnected when the power supply output end detects undervoltage;
the switch control signal input end of the first controlled switch module 3 is respectively and electrically connected with the main control module 1, the high-voltage trigger protection module 6 and the low-voltage trigger protection module 7, and the control signal input end of the second controlled switch module 5 is respectively and electrically connected with the main control module 1, the high-voltage trigger protection module 6 and the low-voltage trigger protection module 7.
In this embodiment, the main control module 1 may respectively send voltages for triggering the conduction of the first controlled switch module 3 and the second controlled switch module 5 to the first controlled switch module 3 and the second controlled switch module 5, and the high-voltage trigger protection module 6 and the low-voltage trigger protection module 7 may be connected to the control signal input terminal of the first controlled switch module 3 and the control signal input terminal of the second controlled switch module 5, so as to divide the voltages for triggering the conduction of the first controlled switch module 3 and the second controlled switch module 5, so that the conduction voltages of the first controlled switch module 3 and the second controlled switch module 5 are too low to conduct, and the power supplies of the dryer fan module 2 and the dryer electrothermal module 4 are disconnected.
For example, when the detection voltage is connected to the control signal input end of the high-voltage trigger protection module 6, if the detection voltage is in a high-voltage state, the high-voltage trigger protection module 6 is turned on, that is, a part of the voltage output by the main control module 1 for triggering the first controlled switch module 3 and the second controlled switch module 5 to be turned on is output to the high-voltage trigger protection module 6, that is, the voltages on the first controlled switch module 3 and the second controlled switch module 5 are not enough to turn on the first controlled switch module and the second controlled switch module 5, so that the power supply of the dryer fan module 2 and the dryer electric heating module 4 is disconnected;
and when the detection voltage is connected to the control signal input end of the low-voltage trigger protection module 7, if the detection voltage is in a low-voltage state, the low-voltage trigger protection module 7 is turned on, that is, a part of the voltage output by the main control module 1 for triggering the first controlled switch module 3 and the second controlled switch module 5 to be turned on is output to the low-voltage trigger protection module 7, that is, the voltages on the first controlled switch module 3 and the second controlled switch module 5 are not enough to be turned on, so that the power supply of the dryer fan module 2 and the dryer electric heating module 4 is disconnected.
Referring to fig. 1, in the embodiment of the present invention, it is preferable that:
a triode Q1 which is used for being conducted when the detection power supply output end is over-voltage is arranged in the high-voltage trigger protection module 6, a collector of the triode Q1 is electrically connected with a control signal input end of the first controlled switch module 3 and a control signal input end of the second controlled switch module 5 respectively, an emitter of the triode Q1 is grounded, a base of the triode Q1 is connected with one end of a resistor R1, the other end of the resistor R1 is connected with the detection power supply output end, and a resistor R2 is connected between the emitter and the base of the triode Q1.
Preferably, when the detection voltage is applied to the control signal input terminal of the transistor Q1, if the detection voltage is in a high voltage state, the transistor Q1 is turned on, that is, a part of the voltage output by the main control module 1 for triggering the first controlled switch module 3 and the second controlled switch module 5 to be turned on is output to the transistor Q1, that is, the voltage on the first controlled switch module 3 and the second controlled switch module 5 is not enough to turn on the first controlled switch module 3 and the second controlled switch module 5, so that the power supply of the dryer fan module 2 and the dryer electric heating module 4 is disconnected.
Referring to fig. 2, in the embodiment of the present invention, it is preferable that:
a triode Q2 used for being cut off when the undervoltage of the power supply output end is detected and a triode Q3 used for being conducted when the undervoltage of the power supply output end is detected are arranged in the low-voltage trigger protection module 7;
the collector of the triode Q2 is connected with the base of the triode Q3, the emitter of the triode Q2 is grounded, the base of the triode Q2 is connected with one end of a resistor R3, the other end of the resistor R3 is connected with the output end of a detection power supply, and a resistor R4 is connected between the emitter and the base of the triode Q2;
the collector of the triode Q3 is respectively and electrically connected with the control signal input end of the first controlled switch module 3 and the control signal input end of the second controlled switch module 5, the emitter of the triode Q3 is grounded, the base of the triode Q3 is connected with one end of the resistor R5, and the other end of the resistor R5 is connected with the output end of the circuit voltage VCC.
Preferably, when the detection voltage is connected to the control signal input end of the triode Q2, if the detection voltage is in a low voltage state, the triode Q2 is cut off, the voltage of the triode Q3 connected to the collector of the triode Q2 does not need to be divided to the triode Q2, and the remaining voltage is enough to turn on the triode Q3, that is, a part of the voltage output by the main control module 1 for triggering the first controlled switch module 3 and the second controlled switch module 5 to be turned on is output to the triode Q3, and the voltage on the first controlled switch module 3 and the second controlled switch module 5 is not enough to turn on, so that the power supply of the dryer fan module 2 and the dryer electric heating module 4 is disconnected;
and if the detected voltage is in a normal voltage state, the triode Q2 is conducted, and further the voltage of the triode Q3 connected to the collector of the triode Q2 needs to be divided to the triode Q2, that is, a part of the voltage for triggering the conduction of the triode Q3 is output to the triode Q2, and further the voltage on the triode Q3 is not enough to conduct the voltage, and after the triode Q3 is cut off, the voltage output by the main control module 1 for triggering the conduction of the first controlled switch module 3 and the second controlled switch module 5 does not need to be distributed, that is, the first controlled switch module 3 is in conduction connection with the second controlled switch module 5, and further the power supply of the dryer fan module 2 and the dryer electric heating module 4 is conducted.
Referring to fig. 1, in the embodiment of the present invention, it is preferable that:
a first relay switch circuit 31 for controlling the on-off of the power supply of the dryer fan module 2 and a first relay coil circuit 32 for controlling the on-off of the first relay switch circuit 31 are arranged in the first controlled switch module 3;
the control signal input end of the first relay coil circuit 32 is electrically connected with the main control module 1, the high-voltage trigger protection module 6 and the low-voltage trigger protection module 7 respectively.
Referring to fig. 1, in the embodiment of the present invention, it is preferable that:
a relay coil K1 and a triode Q5 for controlling the on-off of the relay coil K1 are arranged in the first relay coil circuit 32;
the collector of the triode Q5 is electrically connected with the relay coil K1, the emitter of the triode Q5 is grounded, and the base of the triode Q5 is used as the control signal input end of the first relay coil circuit 32 and is electrically connected with the main control module 1, the high-voltage trigger protection module 6 and the low-voltage trigger protection module 7 respectively.
Preferably, when the transistor Q5 is turned on, i.e. after the relay coil K1 is energized, the iron core is magnetized to generate a sufficient electromagnetic force to attract the armature and drive the spring, so that the moving contact and the fixed contact in the first relay switch circuit 31 are closed or separated, i.e. the originally closed contact is opened and the originally opened contact is closed; when the triode Q5 is cut off, namely no current flows through the relay coil K1 at the collector, namely the relay coil K1 is powered off, the electromagnetic attraction force disappears, the armature returns to the original position, and the movable contact and the static contact return to the original closed or separated state.
Referring to fig. 1, in the embodiment of the present invention, it is preferable that:
a second relay switch circuit 51 for controlling the on-off of the power supply of the electromechanical heating module 4 of the drying machine and a second relay coil circuit 52 for controlling the on-off of the second relay switch circuit 51 are arranged in the second controlled switch module 5;
the control signal input end of the second relay coil circuit 52 is electrically connected with the main control module 1, the high-voltage trigger protection module 6 and the low-voltage trigger protection module 7 respectively.
Referring to fig. 1, in the embodiment of the present invention, it is preferable that:
a relay coil K2, a triode Q4 for controlling the on-off of the relay coil K2, a freewheeling diode D5 for preventing sudden change of voltage and current to protect the triode Q4 and a capacitor C4 for absorbing surge voltage to protect the freewheeling diode D5 are arranged in the second relay coil circuit 52;
the freewheeling diode D5 is connected in parallel to two ends of the relay coil K2, the capacitor C4 is connected in parallel to two ends of the freewheeling diode D5, the collector of the transistor Q4 is electrically connected to the relay coil K2, the emitter of the transistor Q4 is grounded, and the base of the transistor Q4 is used as the control signal input end of the second relay coil circuit 52 and is electrically connected to the main control module 1, the high-voltage trigger protection module 6 and the low-voltage trigger protection module 7 respectively.
Preferably, the diode D5 connected in parallel with the relay coil K2 is a protection diode, which is also called a freewheeling diode, because at the moment of power failure of the inductor of the relay coil K2, a higher reverse voltage is generated across the relay coil K2, and this voltage is superimposed with the power supply voltage, and is added between c and e of the transistor Q4, which is likely to exceed the maximum reverse breakdown voltage of the transistor Q4, so that the transistor Q4 breaks down, and the diode D5 functions to eliminate the influence of this reverse voltage and protect the normal operation of the circuit to prevent the circuit elements from being damaged.
In the embodiment, an NPN type triode Q4 is adopted to drive a relay coil K2, when the positive power supply input is 0V, the triode is cut OFF, and the relay coil K2 releases OFF; ON the contrary, when the positive power supply input is + VCC, the triode is saturated, and the relay coil K2 is attracted to be ON;
and the diode D5 can control the circuit current to change more gently when the current changes suddenly or reduces, so as to avoid the generation of surge voltage and improve the use safety of the overvoltage and undervoltage protection circuit for the dryer.
It can be seen that, implementing the overvoltage and undervoltage protection circuit for the drying machine described in fig. 1-2 solves the problem that the heating device, the ac controller, the motor, the indicator lamp and other electric appliances are easy to be damaged in the operation of the existing drying machine due to the common occurrence of the fault line connection of the client and the pulse voltage generated to the power grid when other high-power equipment is in operation, which not only increases the maintenance cost, but also affects the production efficiency to a certain extent, and can effectively improve the service life of the product, reduce the maintenance reject ratio and improve the use efficiency of the client production equipment.
In addition, the over-voltage and under-voltage protection circuit for the drying machine described in fig. 1 to 2 is implemented, and by adding the high-voltage trigger protection module and the low-voltage trigger protection module of the power supply, when a client is in line fault and the voltage pulse voltage of the field power grid is too high, the device immediately gives an alarm and cuts off the power supply, so that electrical elements such as a heating device, an alternating current controller, a motor, an indicator light and the like can be effectively prevented from being burnt out due to the too high voltage.
In addition, the over-voltage and under-voltage protection circuit for the drying machine described in fig. 1 to fig. 2 can improve the service life of the product, reduce the maintenance reject ratio and improve the use efficiency of the customer production equipment.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures made by using the contents of the present specification and the drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. The utility model provides a cross undervoltage protection circuit for desiccator which characterized in that: the drying machine power supply protection device comprises a main control module (1), a first controlled switch module (3) used for controlling the on-off of a power supply of a drying machine fan module (2), a second controlled switch module (5) used for controlling the on-off of the power supply of a drying machine electric heating module (4), a high-voltage trigger protection module (6) used for controlling the first controlled switch module (3) and the second controlled switch module (5) to be disconnected when the overvoltage of the power supply output end of a drying machine power supply is detected, and a low-voltage trigger protection module (7) used for controlling the first controlled switch module (3) and the second controlled switch module (5) to be disconnected when the undervoltage of the power supply output end is detected;
the high-voltage trigger protection module (6) is connected with the low-voltage trigger protection module (7), and the control signal input end of the second controlled switch module (5) is connected with the main control module (1), the high-voltage trigger protection module (6) and the low-voltage trigger protection module (7) respectively.
2. The over-voltage and under-voltage protection circuit for the drying machine according to claim 1, wherein:
be equipped with in high pressure trigger protection module (6) and be used for detecting triode Q1 that switches on when power output end excessive pressure, triode Q1's collecting electrode electricity respectively connect the control signal input of first controlled switch module (3) with the control signal input of second controlled switch module (5), triode Q1's projecting pole ground connection, triode Q1's base connects resistance R1's one end, another termination of resistance R1 detect power output end, it has resistance R2 to connect between triode Q1's projecting pole and the base.
3. The over-voltage and under-voltage protection circuit for the drying machine according to claim 1, wherein:
a triode Q2 used for being cut off when the output end of the detection power supply is undervoltage and a triode Q3 used for being conducted when the output end of the detection power supply is undervoltage are arranged in the low-voltage trigger protection module (7);
the collector of the triode Q2 is connected with the base of the triode Q3, the emitter of the triode Q2 is grounded, the base of the triode Q2 is connected with one end of a resistor R3, the other end of the resistor R3 is connected with the output end of the detection power supply, and a resistor R4 is connected between the emitter and the base of the triode Q2;
the collecting electrode electricity of triode Q3 connect respectively the control signal input of first controlled switch module (3) with the control signal input of second controlled switch module (5), triode Q3's projecting pole ground connection, triode Q3's base is connected with resistance R5's one end, resistance R5's another termination circuit voltage VCC output.
4. The under-voltage and over-voltage protection circuit for the drying machine according to any one of claims 1 to 3, wherein:
a first relay switch circuit (31) for controlling the on-off of a power supply of the dryer fan module (2) and a first relay coil circuit (32) for controlling the on-off of the first relay switch circuit (31) are arranged in the first controlled switch module (3);
and the control signal input end of the first relay coil circuit (32) is respectively and electrically connected with the main control module (1), the high-voltage trigger protection module (6) and the low-voltage trigger protection module (7).
5. The over-voltage and under-voltage protection circuit for the dryer according to claim 4, wherein:
a relay coil K1 and a triode Q5 for controlling the on-off of the relay coil K1 are arranged in the first relay coil circuit (32);
the collector of the triode Q5 is electrically connected with the relay coil K1, the emitter of the triode Q5 is grounded, and the base of the triode Q5 is used as the control signal input end of the first relay coil circuit (32) to be respectively and electrically connected with the main control module (1), the high-voltage trigger protection module (6) and the low-voltage trigger protection module (7).
6. The under-voltage and over-voltage protection circuit for the drying machine according to any one of claims 1 to 3, wherein:
a second relay switch circuit (51) for controlling the on-off of the power supply of the drying machine electrothermal module (4) and a second relay coil circuit (52) for controlling the on-off of the second relay switch circuit (51) are arranged in the second controlled switch module (5);
and the control signal input end of the second relay coil circuit (52) is respectively and electrically connected with the main control module (1), the high-voltage trigger protection module (6) and the low-voltage trigger protection module (7).
7. The under-voltage and over-voltage protection circuit for the drying machine according to claim 6, wherein:
a relay coil K2, a triode Q4 for controlling the on-off of the relay coil K2, a freewheeling diode D5 for preventing voltage and current from suddenly changing to protect the triode Q4 and a capacitor C4 for absorbing surge voltage to protect the freewheeling diode D5 are arranged in the second relay coil circuit (52);
the freewheeling diode D5 is connected in parallel to two ends of the relay coil K2, the capacitor C4 is connected in parallel to two ends of the freewheeling diode D5, the collector of the triode Q4 is electrically connected to the relay coil K2, the emitter of the triode Q4 is grounded, and the base of the triode Q4 is used as the control signal input end of the second relay coil circuit (52) to be electrically connected with the main control module (1), the high-voltage trigger protection module (6) and the low-voltage trigger protection module (7) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121044905.0U CN215452497U (en) | 2021-05-14 | 2021-05-14 | Over-voltage and under-voltage protection circuit for drying machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121044905.0U CN215452497U (en) | 2021-05-14 | 2021-05-14 | Over-voltage and under-voltage protection circuit for drying machine |
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| CN215452497U true CN215452497U (en) | 2022-01-07 |
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| CN202121044905.0U Active CN215452497U (en) | 2021-05-14 | 2021-05-14 | Over-voltage and under-voltage protection circuit for drying machine |
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| CN (1) | CN215452497U (en) |
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2021
- 2021-05-14 CN CN202121044905.0U patent/CN215452497U/en active Active
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