CN211623784U - Heat radiation fan control circuit of intercom device, intercom power cord and intercom device - Google Patents
Heat radiation fan control circuit of intercom device, intercom power cord and intercom device Download PDFInfo
- Publication number
- CN211623784U CN211623784U CN202020176325.6U CN202020176325U CN211623784U CN 211623784 U CN211623784 U CN 211623784U CN 202020176325 U CN202020176325 U CN 202020176325U CN 211623784 U CN211623784 U CN 211623784U
- Authority
- CN
- China
- Prior art keywords
- control circuit
- electrically connected
- input end
- circuit
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model provides a radiator fan control circuit of intercom, intercom power cord and intercom, this radiator fan control circuit includes power input end, signal generation circuit, master control circuit, drive circuit and radiator fan interface, and the power input end provides the power to signal generation circuit, master control circuit, drive circuit and radiator fan interface; the signal generating circuit comprises a comparator, a first input end of the comparator and a second input end of the comparator are both electrically connected with the power input end, the first input end of the comparator is connected with a first capacitor in parallel, and the output end of the comparator is electrically connected with the main control circuit; the main control circuit is electrically connected with the driving circuit, and the driving circuit is electrically connected with the interface of the cooling fan. The interphone power line applies the cooling fan control circuit. The intercom device is applied to the intercom device. Use the utility model discloses an intercom device control sensitivity is higher, the energy saving consumed the festival.
Description
Technical Field
The utility model relates to an intercom heat dissipation technical field especially relates to a radiator fan control circuit of intercom, still relates to the intercom power cord that uses this radiator fan control circuit, still relates to the intercom of using this intercom power cord.
Background
The current required by the vehicle-mounted interphone or the base interphone is small when receiving sound, but the required power is high when sending signals, the power of the general vehicle-mounted interphone is 50 watts, and a power module of the interphone is easy to generate heat, so that a heat radiating fan needs to be arranged for radiating heat to prevent the interphone from being burnt.
However, when the existing interphone controls the heat dissipation fan to work, the heat dissipation fan is controlled to work only by starting the interphone, and the interphone is not controlled according to the working condition of the power module, which causes waste of the power supply. Moreover, some interphones do not have built-in cooling fans, and inconvenience exists when cooling fans need to be installed.
Disclosure of Invention
A first object of the utility model is to provide a radiator fan control circuit of the higher intercom of control sensitivity.
The utility model discloses a second purpose provides a control sensitivity is higher, is convenient for external radiator fan's intercom power cord.
The third purpose of the utility model is to provide a control sensitivity is higher, the intercom of the energy saving consumption.
In order to achieve the first object, the heat dissipation fan control circuit of the intercom device provided by the utility model comprises a power input end, a signal generation circuit, a main control circuit, a driving circuit and a heat dissipation fan interface, wherein the power input end provides power for the signal generation circuit, the main control circuit, the driving circuit and the heat dissipation fan interface; the signal generating circuit comprises a comparator, a first input end of the comparator and a second input end of the comparator are both electrically connected with the power input end, the first input end of the comparator is connected with a first capacitor in parallel, and the output end of the comparator is electrically connected with the main control circuit; the main control circuit is electrically connected with the driving circuit, and the driving circuit is electrically connected with the interface of the cooling fan.
According to the above technical scheme, the utility model discloses a radiator fan control circuit's signal generation circuit is through setting up the comparator, the first input of comparator all is connected with the power input end electricity with the second input of comparator, the first input of comparator is parallelly connected with first electric capacity, when power input end's voltage reduces, because first input is parallelly connected with first electric capacity, lead to forming pressure differential between the first input of comparator and the second input, the comparator enlargies pressure differential and transmits to master control circuit, make the radiator fan that the steerable drive circuit of master control circuit drive and radiator fan interface electricity are connected dispel the heat, carry out control signal's transmission through setting up the comparator, detectable voltage's change, improve the sensitivity of control.
In a further scheme, a diode is arranged on a path between the output end of the comparator and the main control circuit, the cathode of the diode is electrically connected with the output end of the comparator, and the anode of the diode is electrically connected with the main control circuit.
Therefore, by arranging the diode, the cathode of the diode is electrically connected with the output end of the comparator, the anode of the diode is electrically connected with the main control circuit, and the diode obtains the voltage of the output end of the comparator so as to conduct a channel between the output end of the comparator and the main control circuit, so that the main control circuit can obtain the control signal.
In a further scheme, the driving circuit comprises a PNP triode and an NPN triode, the base electrode of the PNP triode is electrically connected with the main control circuit, the collector electrode of the PNP triode is electrically connected with the base electrode of the NPN triode, and the collector electrode of the NPN triode is electrically connected with the interface of the cooling fan.
Therefore, the sensitivity of the triode is high, and the PNP triode and the NPN triode are arranged as the driving circuit, so that the control sensitivity of the driving circuit is improved.
In a further scheme, a first pull-up resistor is connected in series on a branch circuit between the first input end and the power supply input end; a second pull-up resistor is connected in series on a branch circuit between the second input end and the power supply input end; the first pull-up resistor and the second pull-up resistor have the same resistance value.
In a further scheme, the first input end is connected with a first pull-down resistor in parallel, the first end of the first pull-down resistor is electrically connected with the first input end, and the second end of the first pull-down resistor is grounded; the second input end is connected with a second pull-down resistor in parallel, the first end of the second pull-down resistor is electrically connected with the first input end, and the second end of the second pull-down resistor is grounded; the first pull-down resistor and the second pull-down resistor have the same resistance value.
Therefore, the first pull-up resistor, the second pull-up resistor, the first pull-down resistor and the second pull-down resistor are arranged, the resistance values of the first pull-up resistor and the second pull-up resistor are the same, and the resistance values of the first pull-down resistor and the second pull-down resistor are the same, so that when the input voltage of the power input end is normal, no differential pressure is formed between the first input end and the second input end.
In a further scheme, a first filter circuit is arranged on a path between the cooling fan interface and the power supply input end, the input end of the first filter circuit is electrically connected with the power supply input end, and the output end of the first filter circuit is electrically connected with the anode of the cooling fan interface.
In a further aspect, the first filter circuit is an RC filter circuit.
Therefore, the first filter circuit is arranged on a path between the cooling fan interface and the power supply input end, the alternating current part of the input voltage of the power supply input end can be filtered out, and the cooling fan interface is controlled more stably.
In a further scheme, a voltage reduction circuit and a second filter circuit are arranged on a path between a power supply end of the main control circuit and a power supply input end, the input end of the voltage reduction circuit is electrically connected with the power supply input end, the output end of the voltage reduction circuit is electrically connected with the input end of the second filter circuit, and the output end of the second filter circuit is electrically connected with the power supply end of the main control circuit.
In order to achieve the second object, the utility model provides an interphone power cord includes power source, interphone interface and cooling fan control circuit, the power source is connected with the interphone interface electricity; the cooling fan control circuit is applied to the cooling fan control circuit; the power input end of the cooling fan control circuit is connected in parallel with a channel between the power interface and the interphone interface.
According to the above technical scheme, the utility model discloses an among the intercom power cord, radiator fan control circuit's signal generation circuit is through setting up the comparator, the first input of comparator and the second input of comparator all are connected with the power input end electricity, the first input of comparator connects in parallel has first electric capacity, when power input end's voltage reduces, because first input has first electric capacity in parallel, form pressure differential between the first input that leads to the comparator and the second input, the comparator enlargies pressure differential and transmits to master control circuit, make the steerable drive circuit drive radiator fan of master control circuit dispel the heat, carry out control signal's transmission through setting up the comparator, detectable voltage's change, improve the sensitivity of control. Meanwhile, the radiating fan interface is arranged, so that the radiating fan can be conveniently and externally connected, and the intercom device without the radiating fan can be used for radiating heat. And the power interface and the interphone interface are arranged, so that the interphone can be conveniently disassembled and assembled.
In order to achieve the third object, the utility model provides an intercom device includes power, intercom control circuit, intercom power cord and radiator fan, the intercom power cord uses above-mentioned intercom power cord; the power supply is electrically connected with the power supply interface, the interphone interface is electrically connected with the talkback control circuit, and the cooling fan interface is electrically connected with the cooling fan.
It can be seen from the above solution that, in the intercom device of the present invention, the signal generating circuit of the cooling fan control circuit is provided with the comparator, the first input terminal of the comparator and the second input terminal of the comparator are both electrically connected with the power input terminal, the first input terminal of the comparator is connected in parallel with the first capacitor, the power input terminal of the cooling fan control circuit is connected in parallel with the path between the power supply and the intercom control circuit, when the intercom control circuit sends signals, the voltage at the power input terminal can be reduced due to the tidal effect of electricity, because the first input terminal is connected in parallel with the first capacitor, the pressure difference is formed between the first input terminal and the second input terminal of the comparator, the comparator amplifies the pressure difference and transmits the pressure difference to the main control circuit, so that the main control circuit can control the driving circuit to drive the cooling fan to dissipate heat, and the comparator is provided to send control signals, the voltage change can be detected, and the control sensitivity is improved. In addition, the heat radiation fan is controlled to radiate when the talkback control circuit sends signals, so that energy consumption can be saved.
Drawings
Fig. 1 is a block diagram of a circuit structure of an embodiment of the power line of the intercom of the present invention.
Fig. 2 is a schematic circuit diagram of a control circuit of a heat dissipation fan in an embodiment of the interphone power line of the present invention.
Fig. 3 is a block diagram of a circuit structure of an embodiment of the intercom device of the present invention.
The present invention will be further explained with reference to the drawings and examples.
Detailed Description
Interphone power line embodiment:
as shown in fig. 1, in this embodiment, the interphone power line includes a power interface 1, an interphone interface 2 and a cooling fan control circuit 3, the power interface 1 is electrically connected to the interphone interface 2, and the cooling fan control circuit 3 is connected in parallel to a path between the power interface 1 and the interphone interface 2.
Referring to fig. 2, the cooling fan control circuit 3 includes a power input terminal 31, a signal generating circuit 32, a main control circuit U1, a driving circuit 33 and a cooling fan interface 34, the power input terminal 31 is connected in parallel to a path between the power interface 1 and the intercom interface 2, and the power input terminal 31 supplies power to the signal generating circuit 32, the main control circuit U1, the driving circuit 33 and the cooling fan interface 34. Preferably, the main control circuit U1 adopts an AT89C2051 type singlechip.
The signal generating circuit 32 includes a comparator U2, preferably a comparator U2 in the form of LM 393. A first input of the comparator U2 and a second input of the comparator U2 are both electrically connected to the power input 31. The main control circuit U1 is electrically connected to the driving circuit 33, and the driving circuit 33 is electrically connected to the cooling fan interface 34.
The first input terminal of the comparator U2 is connected in parallel with a first capacitor C1, a first terminal of the first capacitor C1 is electrically connected to the first input terminal, and a second terminal of the first capacitor C1 is grounded, in this embodiment, the first capacitor C1 is 1000 μ F. A first pull-up resistor R1 is connected in series on a branch between the first input end of the comparator U2 and the power input end 31, a second pull-up resistor R2 is connected in series on a branch between the second input end of the comparator U2 and the power input end 31, and the resistance values of the first pull-up resistor and the second pull-up resistor are the same. The first input end is also connected with a first pull-down resistor R3 in parallel, the first end of the first pull-down resistor R3 is electrically connected with the first input end, and the second end of the first pull-down resistor R3 is grounded. The second input end is connected with a second pull-down resistor R4 in parallel, the first end of the second pull-down resistor R4 is electrically connected with the first input end, the second end of the second pull-down resistor R4 is grounded, and the resistance values of the first pull-down resistor R3 and the second pull-down resistor R4 are the same.
In this embodiment, the signal generating circuit 32 further includes a resistor R5 and a capacitor C2, the first pull-up resistor R1 and the second pull-up resistor R2 are both electrically connected to the power input terminal 31 through a resistor R5, and the capacitor C2 is connected in parallel to a path between the resistor R5 and the first pull-up resistor R1 and the second pull-up resistor R2.
In this embodiment, a diode D1 is disposed in a path between the output end of the comparator U2 and the main control circuit U1, a cathode of the diode D1 is electrically connected to the output end of the comparator U2, an anode of the diode D1 is electrically connected to the main control circuit U1, and an output end of the comparator U2 is further electrically connected to the power input terminal 31 through a resistor R6. Preferably, the diode D1 is an IN4001 type diode.
A first filter circuit 35 is disposed in a path between the cooling fan interface 34 and the power input terminal 31, an input terminal of the first filter circuit 35 is electrically connected to the power input terminal 31, and an output terminal of the first filter circuit 35 is electrically connected to an anode of the cooling fan interface 34. In this embodiment, the first filter circuit 35 is an RC filter circuit. The first filter circuit 35 includes a resistor R7, a capacitor C3, and a capacitor C4, a first end of the resistor R7 is electrically connected to the power input terminal 31, a second end of the resistor R7 is electrically connected to the positive electrode of the cooling fan interface 34, a first end of the capacitor C3 is electrically connected to the second end of the resistor R7, a second end of the capacitor C3 is grounded, a first end of the capacitor C4 is electrically connected to the second end of the resistor R7, and a second end of the capacitor C4 is grounded.
A voltage reduction circuit U3 and a second filter circuit 36 are arranged on a path between a power supply end of the main control circuit U1 and the power supply input end 31, an input end of the voltage reduction circuit U3 is electrically connected with the power supply input end 31, an output end of the voltage reduction circuit U3 is electrically connected with an input end of the second filter circuit 36, and an output end of the second filter circuit 36 is electrically connected with a power supply end of the main control circuit U1. In this embodiment, the second filter circuit 36 is a capacitor filter circuit. The second filter circuit 36 comprises a capacitor C5 and a capacitor C6, a first end of the capacitor C5 is electrically connected with the output end of the voltage-reducing circuit U3, a second end of the capacitor C5 is grounded, a first end of the capacitor C6 is electrically connected with the output end of the voltage-reducing circuit U3, and a second end of the capacitor C6 is grounded. Preferably, the voltage reduction circuit U3 is a 7805 three-terminal voltage regulation integrated circuit.
The driving circuit 33 comprises a PNP triode Q1 and an NPN triode Q2, a base of the PNP triode Q1 is electrically connected with the main control circuit U1 through a resistor R8, a collector of the PNP triode Q1 is electrically connected with a base of the NPN triode Q2, an emitter of the PNP triode Q1 is electrically connected with an output end of the second filter circuit 36 through a resistor R9, a collector of the NPN triode Q2 is electrically connected with a cathode of the cooling fan interface 34, and an emitter of the NPN triode Q2 is grounded.
Intercom equipment embodiment:
as shown in fig. 3, the intercom device of the present embodiment includes an intercom power line 10, a power supply 20, an intercom control circuit 30, and a heat radiation fan 40. The interphone power line 10 is the interphone power line in the above embodiment. The power supply 20 is electrically connected with the power supply interface 1, the interphone interface 2 is electrically connected with the intercom control circuit 30, and the cooling fan interface 34 is electrically connected with the cooling fan 40. The power supply 20 supplies power to the intercom control circuit 30 and the cooling fan 40. In this embodiment, the power source 20 is connected to the power source interface 1 in a plug-in manner, the intercom interface 2 is connected to the intercom control circuit 30 in a plug-in manner, and the cooling fan interface 34 is connected to the cooling fan 40 in a plug-in manner.
The utility model discloses an equipment of talkbacking is under the on-state, power 20 provides the power to the control circuit 30 of talkbacking, when not sending signal, the power loss of control circuit 30 of talkbacking is lower, the voltage of power input 31 does not have obvious change, there is not the voltage difference between the first input of comparator U2 and comparator U2's the second input, at this moment, diode D1's positive end is 5V, the negative end is 13.8V, diode D1 ends, main control circuit U1 sends the high level to PNP triode Q1, PNP triode Q1 and NPN triode Q2 are in the off-state, radiator fan 40 shut down. When the intercom device sends a signal, the power loss of the intercom control circuit 30 is increased, due to the tidal effect of electricity, the voltage of the power supply input end 31 is reduced, because the first input end of the comparator U2 is connected in parallel with the first capacitor C1, the first capacitor C1 stores electric energy, the voltage of the first input end of the comparator U2 is reduced slowly, so that a voltage difference is formed between the first input end and the second input end of the comparator U2, the comparator U2 outputs a low voltage, the diode D1 is conducted in the forward direction, the diode D1 conducts a path between the output end of the comparator U2 and the main control circuit U1, the main control circuit U1 obtains a control signal, the main control circuit U1 sends a low level to the PNP triode Q1, the PNP triode Q1 and the NPN triode Q2 are in a conducting state, and the cooling fan 40 is started to cool.
It should be noted that, the driving circuit 33 of the present invention can adopt a relay switch circuit structure besides the triode circuit structure in this embodiment, and the relay switch circuit is a technology known to those skilled in the art and is not described herein again.
Therefore, in the intercom device of the present invention, the comparator is provided, the first input terminal of the comparator and the second input terminal of the comparator are electrically connected to the power input terminal, the first input terminal of the comparator is connected in parallel with the first capacitor, the power input terminal of the cooling fan control circuit is connected in parallel to the path between the power circuit and the intercom control circuit, when the intercom control circuit sends a signal, the voltage at the power input terminal is reduced due to the tidal effect of electricity, the first input terminal is connected in parallel with the first capacitor, so that a pressure difference is formed between the first input terminal and the second input terminal of the comparator, the comparator amplifies the pressure difference and transmits the pressure difference to the main control circuit, so that the main control circuit can control the driving circuit to drive the cooling fan to dissipate heat, the comparator is provided to send a control signal, the voltage change can be detected, and the control sensitivity is improved.
It should be noted that the above is only a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and all insubstantial modifications made by using the design concept of the present invention also fall within the protection scope of the present invention.
Claims (10)
1. The utility model provides a radiator fan control circuit of equipment of talkbacking which characterized in that: the cooling system comprises a power input end, a signal generating circuit, a master control circuit, a driving circuit and a cooling fan interface, wherein the power input end supplies power to the signal generating circuit, the master control circuit, the driving circuit and the cooling fan interface;
the signal generating circuit comprises a comparator, a first input end of the comparator and a second input end of the comparator are both electrically connected with the power supply input end, a first capacitor is connected in parallel with the first input end of the comparator, and an output end of the comparator is electrically connected with the main control circuit;
the main control circuit is electrically connected with the driving circuit, and the driving circuit is electrically connected with the cooling fan interface.
2. The heat dissipation fan control circuit of the intercom device according to claim 1, characterized in that:
and a diode is arranged on a path between the output end of the comparator and the main control circuit, the cathode of the diode is electrically connected with the output end of the comparator, and the anode of the diode is electrically connected with the main control circuit.
3. The heat dissipation fan control circuit of the intercom device according to claim 1, characterized in that:
the driving circuit comprises a PNP triode and an NPN triode, the base electrode of the PNP triode is electrically connected with the main control circuit, the collector electrode of the PNP triode is electrically connected with the base electrode of the NPN triode, and the collector electrode of the NPN triode is electrically connected with the cooling fan interface.
4. The heat dissipation fan control circuit of an intercom device according to any one of claims 1 to 3, characterized in that:
a first pull-up resistor is connected in series on a branch circuit between the first input end and the power supply input end;
a second pull-up resistor is connected in series on a branch circuit between the second input end and the power supply input end;
the first pull-up resistor and the second pull-up resistor have the same resistance value.
5. The heat dissipation fan control circuit of an intercom device according to any one of claims 1 to 3, characterized in that:
the first input end is connected with a first pull-down resistor in parallel, the first end of the first pull-down resistor is electrically connected with the first input end, and the second end of the first pull-down resistor is grounded;
the second input end is connected with a second pull-down resistor in parallel, the first end of the second pull-down resistor is electrically connected with the first input end, and the second end of the second pull-down resistor is grounded;
the first pull-down resistor and the second pull-down resistor have the same resistance value.
6. The heat dissipation fan control circuit of an intercom device according to any one of claims 1 to 3, characterized in that:
a first filter circuit is arranged on a path between the cooling fan interface and the power input end, the input end of the first filter circuit is electrically connected with the power input end, and the output end of the first filter circuit is electrically connected with the anode of the cooling fan interface.
7. The heat dissipation fan control circuit of the intercom device according to claim 6, characterized in that:
the first filter circuit is an RC filter circuit.
8. The heat dissipation fan control circuit of an intercom device according to any one of claims 1 to 3, characterized in that:
a path between the power supply end of the main control circuit and the power supply input end is provided with a voltage reduction circuit and a second filter circuit, the input end of the voltage reduction circuit is electrically connected with the power supply input end, the output end of the voltage reduction circuit is electrically connected with the input end of the second filter circuit, and the output end of the second filter circuit is electrically connected with the power supply end of the main control circuit.
9. An intercom power cord, characterized in that: the intelligent interphone comprises a power interface, an interphone interface and a cooling fan control circuit, wherein the power interface is electrically connected with the interphone interface;
the heat dissipation fan control circuit applies the heat dissipation fan control circuit of any one of claims 1 to 8;
the power input end of the cooling fan control circuit is connected in parallel with a channel between the power interface and the interphone interface.
10. The utility model provides an equipment of talkbacking, includes power, talkbacking control circuit, intercom power cord and radiator fan, its characterized in that:
the interphone power line to which the heat dissipation fan control circuit of claim 9 is applied;
the power supply is electrically connected with the power supply interface, the interphone interface is electrically connected with the talkback control circuit, and the cooling fan interface is electrically connected with the cooling fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020176325.6U CN211623784U (en) | 2020-02-17 | 2020-02-17 | Heat radiation fan control circuit of intercom device, intercom power cord and intercom device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020176325.6U CN211623784U (en) | 2020-02-17 | 2020-02-17 | Heat radiation fan control circuit of intercom device, intercom power cord and intercom device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211623784U true CN211623784U (en) | 2020-10-02 |
Family
ID=72618456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020176325.6U Active CN211623784U (en) | 2020-02-17 | 2020-02-17 | Heat radiation fan control circuit of intercom device, intercom power cord and intercom device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211623784U (en) |
-
2020
- 2020-02-17 CN CN202020176325.6U patent/CN211623784U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103208780B (en) | A kind of DC motor control circuit with heat protection function | |
| CN204887621U (en) | LED drive power supply's excess temperature protection circuit | |
| CN105050295A (en) | Over-temperature protection circuit of light-emitting diode (LED) drive power supply | |
| CN103311876A (en) | Power supply fuse alarming circuit and alarming device | |
| CN117311457B (en) | Display card over-frequency circuit | |
| CN211623784U (en) | Heat radiation fan control circuit of intercom device, intercom power cord and intercom device | |
| CN104362773A (en) | Wireless electric energy transmitting device | |
| CN111197589A (en) | Heat radiation fan control circuit of intercom device, intercom power cord and intercom device | |
| CN217824249U (en) | MCU protection system | |
| CN212935774U (en) | Spark-proof circuit and spark-proof device | |
| CN210536339U (en) | Heat dissipation circuit for wireless charging and wireless charger | |
| CN208638252U (en) | A kind of dedicated DC-DC12V25A converter of electric vehicle with electric switch lock function | |
| CN211320909U (en) | Data center micromodule power distribution system | |
| CN109149551B (en) | Active redundant parallel power supply control circuit | |
| CN217984661U (en) | Control circuit of negative pressure fan and negative pressure fan thereof | |
| CN217882831U (en) | Overcurrent protection circuit of frequency converter | |
| CN218301215U (en) | Standby circuit of printer power supply | |
| CN219779841U (en) | Power supply switching circuit and terminal equipment | |
| CN210889416U (en) | Fan speed regulation circuit | |
| CN204210325U (en) | A kind of electric vehicle motor controller pedal self-adaptive circuit | |
| CN219789949U (en) | Control circuit of all-in-one controller low voltage electricity | |
| CN213399338U (en) | Constant current output circuit for user interface circuit | |
| CN219974876U (en) | Fan fault detection circuit, fan and electronic equipment | |
| CN109347465B (en) | Switching tube driving circuit, turn-off device and distributed power generation system | |
| CN219236778U (en) | Active control circuit for high-speed trailer state |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |