CN112034760B - Diesel generator shutdown delay controller circuit - Google Patents
Diesel generator shutdown delay controller circuit Download PDFInfo
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- CN112034760B CN112034760B CN202010913398.3A CN202010913398A CN112034760B CN 112034760 B CN112034760 B CN 112034760B CN 202010913398 A CN202010913398 A CN 202010913398A CN 112034760 B CN112034760 B CN 112034760B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25257—Microcontroller
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention relates to the field of generators, in particular to a diesel generator shutdown delay controller circuit which comprises a relay KA1, a comparator, an energy storage device, a triode Q1 and a relay KA2, wherein the diesel generator shutdown delay controller circuit is electrically connected with a starting motor switch, an electric door lock switch and a fuel valve of a diesel generator through the matching relation of all parts.
Description
Technical Field
The invention relates to the field of generators, in particular to a diesel generator shutdown delay controller circuit.
Background
There is currently no shutdown delay controller circuit for a diesel generator.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the shutdown delay controller circuit of the diesel generator is simple in structure.
In order to solve the technical problems, the invention adopts the technical scheme that:
a diesel generator shutdown delay controller circuit comprises a relay KA1, a comparator, an energy storage device, a triode Q1 and a relay KA 2;
one end of the relay KA1 is electrically connected with the starting motor switch, and the other end of the relay KA1 is electrically connected with the electric door lock switch; the starting motor switch is respectively electrically connected with a reverse input end of the comparator and an energy storage device, the energy storage device is electrically connected with a forward input end of the comparator, an output end of the comparator is electrically connected with a base electrode of a triode Q1, a collector electrode of the triode Q1 is electrically connected with one end of a relay KA2, the other end of the relay KA2 is electrically connected with a storage battery, the storage battery is electrically connected with a power supply end of the comparator, and a common end of the relay KA2 is used for being electrically connected with a fuel valve of a diesel generator;
the diesel generator stop delay controller circuit further comprises a diode VD1, a resistor R3, a resistor R5 and a diode D2; the energy storage device is a capacitor C1;
the negative electrode of the diode VD1 and one end of the resistor R3 are respectively and electrically connected with a starting motor switch, the other end of the resistor R3 is electrically connected with the positive electrode of the diode D2, the negative electrode of the diode D2 is respectively and electrically connected with one end of the resistor R5 and one end of the capacitor C1, the other end of the resistor R5 is electrically connected with the positive input end of the comparator, and the positive electrode of the diode VD1 and the other end of the capacitor C1 are both grounded;
the diesel generator shutdown delay controller circuit further comprises a resistor R6; one end of the resistor R6 is electrically connected with the reverse input end of the comparator, and the other end of the resistor R6 is grounded.
The invention has the beneficial effects that:
the diesel generator shutdown delay controller circuit with the simple structure comprises a relay KA1, a comparator, an energy storage device, a triode Q1 and a relay KA2, realizes shutdown delay control of the diesel generator through the matching relation of all the parts and the electric connection with a starting motor switch, an electric door lock switch and a fuel valve of the diesel generator, and has the advantage of simple structure.
Drawings
Fig. 1 is a connection diagram of a shutdown delay controller circuit of a diesel generator with a simple structure according to the invention.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1, the shutdown delay controller circuit of a diesel generator provided by the invention includes a relay KA1, a comparator, an energy storage device, a triode Q1 and a relay KA 2;
one end of the relay KA1 is electrically connected with the starting motor switch, and the other end of the relay KA1 is electrically connected with the electric door lock switch; the starting motor switch is respectively electrically connected with a reverse input end of the comparator and an energy storage device, the energy storage device is electrically connected with a forward input end of the comparator, an output end of the comparator is electrically connected with a base electrode of a triode Q1, a collector electrode of the triode Q1 is electrically connected with one end of a relay KA2, the other end of the relay KA2 is electrically connected with a storage battery, the storage battery is electrically connected with a power supply end of the comparator, and a common end of the relay KA2 is used for being electrically connected with a fuel valve of a diesel generator;
the diesel generator stop delay controller circuit further comprises a diode VD1, a resistor R3, a resistor R5 and a diode D2; the energy storage device is a capacitor C1;
the negative electrode of the diode VD1 and one end of the resistor R3 are respectively and electrically connected with a starting motor switch, the other end of the resistor R3 is electrically connected with the positive electrode of the diode D2, the negative electrode of the diode D2 is respectively and electrically connected with one end of the resistor R5 and one end of the capacitor C1, the other end of the resistor R5 is electrically connected with the positive input end of the comparator, and the positive electrode of the diode VD1 and the other end of the capacitor C1 are both grounded;
the diesel generator shutdown delay controller circuit further comprises a resistor R6; one end of the resistor R6 is electrically connected with the reverse input end of the comparator, and the other end of the resistor R6 is grounded.
From the above description, the beneficial effects of the present invention are:
the diesel generator shutdown delay controller circuit with the simple structure comprises a relay KA1, a comparator, an energy storage device, a triode Q1 and a relay KA2, realizes shutdown delay control of the diesel generator through the matching relation of all the parts and the electric connection with a starting motor switch, an electric door lock switch and a fuel valve of the diesel generator, and has the advantage of simple structure. The positive voltage of the storage battery passes through the relay KA1 and then the capacitor C1 is charged with voltage through the voltage stabilizer tube VD1, the resistor R3 and the diode D2. The positive voltage of the storage battery passes through the relay KA1, and the resistor R6 divides the voltage to provide reference voltage for the pin 2 of the LM393 comparator.
Further, the device also comprises a resistor R4, and the resistor R4 is connected with the capacitor C1 in parallel.
It can be known from the above description that the resistor R4 connected in parallel to the side of the capacitor C1 discharges the capacitor C1, when the capacitor C1 discharges to a certain voltage, the pin 3 of the LM393 comparator loses voltage, the pin 1 of the LM393 comparator outputs low voltage, the base of the triode Q1 loses voltage, the triode is cut off, the coil KA2 of the relay connected in series to the triode Q1 loses power, the common point of the relay KA2 is disconnected from the normally open contact to return to the normally closed point, and the fuel valve loses power and the fuel needle resets. In the process of slow discharge of the capacitor C1, the time for the fuel valve to get electricity and the fuel needle to cut off the fuel is properly prolonged, and the time delay effect is achieved.
Further, the device also comprises a resistor R8 and a resistor R9; the output end of the comparator is respectively electrically connected with one end of a resistor R8 and one end of a resistor R9, the other end of the resistor R8 is electrically connected with the storage battery, and the other end of the resistor R9 is electrically connected with the base electrode of the triode Q1.
As can be seen from the above description, the pin of the LM393 comparator 1 outputs a high voltage, and the resistor R8 and the resistor R9 supply voltages to the base of the transistor Q1.
Further, the capacitor C2 and the resistor R10 are included; one end of the capacitor C2 is electrically connected with the output end of the comparator, one end of the resistor R10 is electrically connected with the other end of the resistor R9, and the other end of the capacitor C2 and the other end of the resistor R10 are both grounded.
Further, a diode D3 is also included; the diode D3 is connected in parallel with the relay KA 2.
Further, the device also comprises a resistor R7; the inverting input end of the comparator is electrically connected with one end of the resistor R7, and the power supply end of the comparator is electrically connected with the other end of the resistor R7.
Further, the LED lamp and the resistor R11 are also included; the positive pole of the LED lamp is electrically connected with the reverse input end of the comparator, the negative pole of the LED lamp is electrically connected with one end of the resistor R11, and the other end of the resistor R11 is grounded.
As can be seen from the above description, the positive voltage of the storage battery passes through the relay KA1, and generates a loop to the Ground (GND) through the LED and the R11, and the indicator light LED is lighted.
Further, the device also comprises a resistor R1, a resistor R2 and a diode D1; the starter motor switch passes through resistance R1 and is connected with the reverse input end electricity of comparator, the starter motor switch is connected with the anodal electricity of diode D1, diode D1 negative pole is connected with resistance R2 one end electricity, the resistance R2 other end is connected with relay KA1 common port and external machine oil protection trigger point electricity respectively.
Referring to fig. 1, a first embodiment of the present invention is:
in fig. 1, the starter motor switch is indicated by START, the electric door lock switch is indicated by ON, the fuel valve is indicated by CYF, and the oil protection trigger point is indicated by CF.
The invention provides a diesel generator shutdown delay controller circuit which comprises a relay KA1, a comparator, an energy storage device, a triode Q1 and a relay KA2, wherein the relay KA1 is connected with the comparator;
one end of the relay KA1 is electrically connected with the starting motor switch, and the other end of the relay KA1 is electrically connected with the electric door lock switch; the starter motor switch is connected with the reverse input end and the energy storage device electricity of comparator respectively, the energy storage device is connected with the forward input end electricity of comparator, the output of comparator is connected with triode Q1's base electricity, triode Q1's collecting electrode is connected with relay KA2 one end electricity, the relay KA2 other end is connected with the battery electricity, the battery is connected with the power end electricity of comparator, relay KA2 public end is used for being connected with diesel generator's fuel valve electricity.
In the present embodiment, the comparator is of type LM393, and the transistor Q1 is of type 2N 5551.
The diesel generator stop delay controller circuit further comprises a diode VD1, a resistor R3, a resistor R5 and a diode D2; the energy storage device is a capacitor C1;
diode VD1 negative pole and resistance R3 one end are connected with the starter motor switch electricity respectively, the resistance R3 other end and the anodal electric connection of diode D2, diode D2 negative pole is connected with resistance R5 one end and electric capacity C1 one end electricity respectively, the resistance R5 other end is connected with the positive input electricity of comparator, the anodal and the electric capacity C1 other end of diode VD1 all ground connection.
The positive voltage of the storage battery passes through the relay KA1 and then the capacitor C1 is charged with voltage through the voltage stabilizer tube VD1, the resistor R3 and the diode D2.
In the embodiment, the specification of the diode VD1 is 9V1, the resistance of the resistor R3 is 20K Ω, the resistance of the resistor R5 is 1K Ω, the model of the diode D2 is M7, the energy storage device is a capacitor C1, and the specification of the capacitor C1 is 100 μ F/16V.
The diesel generator stop delay controller circuit further comprises a resistor R4, and the resistor R4 is connected with the capacitor C1 in parallel. The resistor R4 connected in parallel to the capacitor C1 discharges electricity to the capacitor C1, when the capacitor C1 discharges electricity to a certain voltage, the pin 3 of the LM393 comparator loses voltage, the pin 1 of the LM393 comparator outputs low voltage, the base electrode of the triode Q1 loses voltage, the triode is cut off, the coil of the relay KA2 connected in series on the triode Q1 loses electricity, the common point of the relay KA2 is disconnected with the normally open contact to return to the normally closed point, and the fuel valve loses electricity to reset the oil needle. In the process of slow discharge of the capacitor C1, the time for the fuel valve to get electricity and the fuel needle to cut off the fuel is properly prolonged, and the time delay effect is achieved.
In the present embodiment, the resistance of the resistor R4 is 1M Ω.
The diesel generator shutdown delay controller circuit further comprises a resistor R6; one end of the resistor R6 is electrically connected with the reverse input end of the comparator, and the other end of the resistor R6 is grounded. The positive voltage of the storage battery passes through the relay KA1, and the resistor R6 divides the voltage to provide reference voltage for the pin 2 of the LM393 comparator.
In the present embodiment, the resistance of the resistor R6 is 50K Ω.
The diesel generator shutdown delay controller circuit further comprises a resistor R8 and a resistor R9; the output end of the comparator is respectively electrically connected with one end of a resistor R8 and one end of a resistor R9, the other end of the resistor R8 is electrically connected with the storage battery, and the other end of the resistor R9 is electrically connected with the base electrode of the triode Q1. The pin output high voltage of the LM393 comparator 1, the resistor R8 and the resistor R9 provide voltage for the base electrode of the triode Q1.
In the present embodiment, the resistance of the resistor R8 is 4.7K Ω, and the resistance of the resistor R9 is 1K Ω.
The diesel generator shutdown delay controller circuit further comprises a capacitor C2 and a resistor R10; one end of the capacitor C2 is electrically connected with the output end of the comparator, one end of the resistor R10 is electrically connected with the other end of the resistor R9, and the other end of the capacitor C2 and the other end of the resistor R10 are both grounded. Further, a diode D3 is also included; the diode D3 is connected in parallel with the relay KA 2. Further, the device also comprises a resistor R7; the inverting input end of the comparator is electrically connected with one end of the resistor R7, and the power supply end of the comparator is electrically connected with the other end of the resistor R7.
In this embodiment, the capacitor C2 has a specification of 47 μ F/25V, and the resistor R10 has a resistance of 10K Ω.
The diesel generator shutdown delay controller circuit further comprises an LED lamp and a resistor R11; the positive pole of the LED lamp is electrically connected with the reverse input end of the comparator, the negative pole of the LED lamp is electrically connected with one end of the resistor R11, and the other end of the resistor R11 is grounded. The positive voltage of the storage battery passes through the relay KA1 and generates a loop through the LED and the R11 to the Ground (GND), and the indicator light LED is lightened.
In the present embodiment, the resistance of the resistor R11 is 2.4K Ω.
The diesel generator shutdown delay controller circuit further comprises a resistor R1, a resistor R2 and a diode D1; the starter motor switch passes through resistance R1 and is connected with the reverse input end electricity of comparator, the starter motor switch is connected with the anodal electricity of diode D1, diode D1 negative pole is connected with resistance R2 one end electricity, the resistance R2 other end is connected with relay KA1 common port and external machine oil protection trigger point electricity respectively.
In the embodiment, the resistor R1 has a specification of 1.2K Ω/2W, the resistor R2 has a specification of 51R, and the diode D1 has a model number of M7.
The working principle of the diesel generator shutdown delay controller circuit is as follows:
firstly, opening an electric door lock switch (ON) to input positive voltage into the storage battery to enter a standby state.
And secondly, a positive voltage of the storage battery is always input into one path, one end of a coil of the relay KA2 and the common end of the relay, and the other path provides working voltage for the pin 8 of the LM393 comparator to enter a standby state.
And thirdly, a positive voltage input of a starting motor Switch (START) storage battery is connected with a circuit from a resistor R2 relay KA1 to the Ground (GND) through a diode D1, the relay KA1 is attracted, and a positive voltage of an electric door lock switch (ON) storage battery enters.
And fourthly, the positive voltage of the storage battery enters a resistor R1 through a relay KA1, one path of the positive voltage passes through an LED and R11 to be connected with the Ground (GND) to generate a loop, and the indicator light LED is lightened. One way and the voltage of the resistor R6 provide reference voltage for the pin 2 of the LM393 comparator. One path is connected with a voltage stabilizer tube VD1, a resistor R3 and a diode D2 to charge a capacitor C1 with voltage.
Fifthly, when the door lock switch is turned off, the pin 2 of the LM393 comparator is low voltage, at the moment, the capacitor C1 enters the pin 3 of the LM393 comparator through the resistor R5 to provide voltage, the pin 1 of the LM393 comparator outputs high voltage, the resistor R8 and the resistor R9 provide voltage for the base electrode of the triode Q1, the triode is conducted, the coil of the relay KA2 connected in series on the triode Q1 is electrified, the relay KA2 is attracted, the common point of the relay is conducted with the normally open contact, the fuel valve is electrified, and the fuel needle is in fuel cutoff work. The diesel generator stops operating. The resistor R4 connected in parallel to the capacitor C1 discharges electricity to the capacitor C1, when the capacitor C1 discharges electricity to a certain voltage, the pin 3 of the LM393 comparator loses voltage, the pin 1 of the LM393 comparator outputs low voltage, the base electrode of the triode Q1 loses voltage, the triode is cut off, the coil of the relay KA2 connected in series on the triode Q1 loses electricity, the common point of the relay KA2 is disconnected with the normally open contact to return to the normally closed point, and the fuel valve loses electricity to reset the oil needle. In the process of slow discharge of the capacitor C1, the time for the fuel valve to get electricity and the fuel needle to cut off the fuel is properly prolonged, and the time delay effect is achieved.
Sixthly, machine oil protection trigger point (CF), when the machine oil pressure is too low, machine oil protection trigger point switches on with Ground (GND), relay KA1 both ends voltage is 0, relay KA1 gets back to the normal close point, LM393 comparator operation action is with keeping the same with when cutting off electric door lock switch, also be for the fuel valve to get the oil needle oil break and maintain the certain time, solve diesel generator in the shutdown process, the combustion chamber gets into diesel oil again under the high temperature condition, produce under the low-speed condition and prevent the big gun sound, let the people be difficult to accept.
In conclusion, the diesel generator shutdown delay controller circuit provided by the invention comprises the relay KA1, the comparator, the energy storage device, the triode Q1 and the relay KA2, realizes the diesel generator shutdown delay control through the matching relationship of all the parts and the electric connection with the starting motor switch, the electric door lock switch and the fuel valve of the diesel generator, and has the advantage of simple structure.
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 changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (8)
1. A diesel generator shutdown delay controller circuit is characterized by comprising a relay KA1, a comparator, an energy storage device, a triode Q1 and a relay KA 2;
one end of the relay KA1 is electrically connected with the starting motor switch, and the other end of the relay KA1 is electrically connected with the electric door lock switch; the starting motor switch is respectively electrically connected with a reverse input end of the comparator and an energy storage device, the energy storage device is electrically connected with a forward input end of the comparator, an output end of the comparator is electrically connected with a base electrode of a triode Q1, a collector electrode of the triode Q1 is electrically connected with one end of a relay KA2, the other end of the relay KA2 is electrically connected with a storage battery, the storage battery is electrically connected with a power supply end of the comparator, and a common end of the relay KA2 is used for being electrically connected with a fuel valve of a diesel generator;
the diesel generator stop delay controller circuit further comprises a diode VD1, a resistor R3, a resistor R5 and a diode D2; the energy storage device is a capacitor C1;
the negative electrode of the diode VD1 and one end of the resistor R3 are respectively and electrically connected with a starting motor switch, the other end of the resistor R3 is electrically connected with the positive electrode of the diode D2, the negative electrode of the diode D2 is respectively and electrically connected with one end of the resistor R5 and one end of the capacitor C1, the other end of the resistor R5 is electrically connected with the positive input end of the comparator, and the positive electrode of the diode VD1 and the other end of the capacitor C1 are both grounded;
the diesel generator shutdown delay controller circuit further comprises a resistor R6; one end of the resistor R6 is electrically connected with the reverse input end of the comparator, and the other end of the resistor R6 is grounded.
2. The diesel generator shutdown delay controller circuit of claim 1, further comprising a resistor R4, the resistor R4 connected in parallel with the capacitor C1.
3. The diesel generator shutdown delay controller circuit of claim 1, further comprising a resistor R8 and a resistor R9; the output end of the comparator is respectively electrically connected with one end of a resistor R8 and one end of a resistor R9, the other end of the resistor R8 is electrically connected with the storage battery, and the other end of the resistor R9 is electrically connected with the base electrode of the triode Q1.
4. The diesel generator shutdown delay controller circuit of claim 3, further comprising a capacitor C2 and a resistor R10; one end of the capacitor C2 is electrically connected with the output end of the comparator, one end of the resistor R10 is electrically connected with the other end of the resistor R9, and the other end of the capacitor C2 and the other end of the resistor R10 are both grounded.
5. The diesel generator shutdown delay controller circuit of claim 1, further comprising a diode D3; the diode D3 is connected in parallel with the relay KA 2.
6. The diesel generator shutdown delay controller circuit of claim 1, further comprising a resistor R7; the inverting input end of the comparator is electrically connected with one end of the resistor R7, and the power supply end of the comparator is electrically connected with the other end of the resistor R7.
7. The diesel generator shutdown delay controller circuit of claim 1, further comprising an LED light and a resistor R11; the positive pole of the LED lamp is electrically connected with the reverse input end of the comparator, the negative pole of the LED lamp is electrically connected with one end of the resistor R11, and the other end of the resistor R11 is grounded.
8. The diesel generator shutdown delay controller circuit of claim 1, further comprising a resistor R1, a resistor R2, and a diode D1; the starter motor switch passes through resistance R1 and is connected with the reverse input end electricity of comparator, the starter motor switch is connected with the anodal electricity of diode D1, diode D1 negative pole is connected with resistance R2 one end electricity, the resistance R2 other end is connected with relay KA1 common port and external machine oil protection trigger point electricity respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010913398.3A CN112034760B (en) | 2020-09-03 | 2020-09-03 | Diesel generator shutdown delay controller circuit |
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| CN202010913398.3A CN112034760B (en) | 2020-09-03 | 2020-09-03 | Diesel generator shutdown delay controller circuit |
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| CN112034760B true CN112034760B (en) | 2021-06-29 |
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| ES2042393A2 (en) * | 1991-03-06 | 1993-12-01 | Hella Kg Hueck & Co | Delay circuit for a motor vehicle. (Machine-translation by Google Translate, not legally binding) |
| CN202886927U (en) * | 2012-11-16 | 2013-04-17 | 湖南江麓重工科技有限公司 | Controllable delayed power-off circuit used after halt of engineering machine |
| CN105676678A (en) * | 2015-12-29 | 2016-06-15 | 北奔重型汽车集团有限公司 | powPPower-off control circuit for electromagnetic power switch |
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| CN108462152A (en) * | 2018-04-03 | 2018-08-28 | 上海灿瑞科技股份有限公司 | A kind of two-phase DC Brushless Motor output protection circuit |
| CN109677338A (en) * | 2018-12-26 | 2019-04-26 | 贵州凯星液力传动机械有限公司 | A kind of delay cut-off control circuit |
| CN109921770A (en) * | 2019-03-07 | 2019-06-21 | 维沃移动通信有限公司 | A kind of motor drive circuit and terminal device |
| CN209184577U (en) * | 2018-10-18 | 2019-07-30 | 杨前进 | A kind of solenoid valve delay disconnecting circuit for drain valve |
-
2020
- 2020-09-03 CN CN202010913398.3A patent/CN112034760B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2042393A2 (en) * | 1991-03-06 | 1993-12-01 | Hella Kg Hueck & Co | Delay circuit for a motor vehicle. (Machine-translation by Google Translate, not legally binding) |
| CN202886927U (en) * | 2012-11-16 | 2013-04-17 | 湖南江麓重工科技有限公司 | Controllable delayed power-off circuit used after halt of engineering machine |
| CN105676678A (en) * | 2015-12-29 | 2016-06-15 | 北奔重型汽车集团有限公司 | powPPower-off control circuit for electromagnetic power switch |
| CN105752001A (en) * | 2016-02-24 | 2016-07-13 | 深圳罗马仕科技有限公司 | Vehicle diagnostic system and delayed power-down circuit for vehicle |
| CN108462152A (en) * | 2018-04-03 | 2018-08-28 | 上海灿瑞科技股份有限公司 | A kind of two-phase DC Brushless Motor output protection circuit |
| CN209184577U (en) * | 2018-10-18 | 2019-07-30 | 杨前进 | A kind of solenoid valve delay disconnecting circuit for drain valve |
| CN109677338A (en) * | 2018-12-26 | 2019-04-26 | 贵州凯星液力传动机械有限公司 | A kind of delay cut-off control circuit |
| CN109921770A (en) * | 2019-03-07 | 2019-06-21 | 维沃移动通信有限公司 | A kind of motor drive circuit and terminal device |
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| CN112034760A (en) | 2020-12-04 |
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