CN-122009061-A - Negative electrode control circuit and method for commercial vehicle loading system

CN122009061ACN 122009061 ACN122009061 ACN 122009061ACN-122009061-A

Abstract

The application provides a negative electrode control circuit and a negative electrode control method for a commercial vehicle mounting system, wherein the negative electrode control circuit is provided with a battery positive electrode interface, a battery negative electrode interface and an output interface, the battery positive electrode interface is connected with the positive electrode of a storage battery, the battery negative electrode interface is connected with the negative electrode of the storage battery, the output interface is connected with the negative electrode of electric equipment, the negative electrode control circuit comprises a field effect transistor, the field effect transistor is provided with a grid electrode, a drain electrode and a source electrode, the grid electrode is connected with the battery positive electrode interface, the drain electrode is connected with the output interface, and the source electrode is connected with the battery negative electrode interface; and the controller detects the voltage of the storage battery in real time, and controls the on and off of the field effect transistor according to the voltage of the storage battery, so as to control the communication state of the output interface and the battery cathode interface. The application solves the technical problems that the lead-acid storage battery manager can only realize the functions of voltage and electric quantity detection, can not directly control a load switch and can not fundamentally solve overdischarge.

Inventors

Heng Xueli
ZUO CHENGGANG
YAO LIANGSHUAI
LI YUCHENG
Shang Enhui
ZHUO LEILEI

Assignees

浙江孚乔图科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260413

Claims (9)

1. A negative pole control circuit for commercial car facial make-up system, its characterized in that, negative pole control circuit (10) are equipped with battery positive electrode interface (11), battery negative electrode interface (12) and output interface (13), battery positive electrode (31) are connected to battery positive electrode interface (11), battery negative electrode (32) are connected to battery negative electrode interface (12), the negative pole of consumer is connected to output interface (13), negative pole control circuit (10) include: The field effect transistor is provided with a grid electrode, a drain electrode and a source electrode, the grid electrode is connected with the battery anode interface (11), the drain electrode is connected with the output interface (13), and the source electrode is connected with the battery cathode interface (12); And the controller (110) detects the voltage of the storage battery in real time, and controls the on and off of the field effect transistor according to the voltage of the storage battery, so as to control the communication state of the output interface (13) and the battery cathode interface (12).
2. The negative control circuit according to claim 1, characterized in that the negative control circuit (10) further comprises: The first triode is provided with a first base electrode, a first collector electrode and a first emitter electrode, the first base electrode is connected with the controller (110) through a first resistor, and the first emitter electrode is grounded; the second triode is provided with a second base electrode, a second collector electrode and a second emitter electrode, the second base electrode is connected with the first collector electrode through a third resistor, the second emitter electrode is connected with the battery anode interface (11), and the second collector electrode is connected with the grid electrode through a seventh resistor; The second base is also connected with the drain through an eleventh resistor and a first diode, the anode of the first diode is connected with the second base through the eleventh resistor, and the cathode of the first diode is connected with the drain.
3. The negative control circuit according to claim 2, characterized in that the negative control circuit (10) further comprises: And the fourth triode is provided with a fourth base electrode, a fourth collector electrode and a fourth emitter electrode, the fourth base electrode is connected with the controller (110) through a fifth resistor, the fourth collector electrode is connected with the grid electrode, and the fourth emitter electrode is grounded.
4. A negative control circuit according to any of claims 1-3, characterized in that the negative control circuit (10) further comprises: one end of the NTC resistor is connected with the grid electrode, and the other end of the NTC resistor is grounded; Wherein the NTC resistor is disposed adjacent to the field effect transistor.
5. A negative control circuit according to any of claims 1-3, characterized in that the negative control circuit (10) further comprises: the voltage dividing circuit is connected in series between the battery positive electrode interface (11) and the ground, and comprises a ninth resistor and a tenth resistor, wherein the first end of the ninth resistor is connected with the battery positive electrode interface (11), the second end of the ninth resistor is connected with one end of the tenth resistor, and the other end of the tenth resistor is grounded; and a voltage division node is arranged between the ninth resistor and the tenth resistor, and the voltage division node is connected with the controller (110) through an eighth resistor.
6. The negative control circuit according to claim 1, characterized in that the negative control circuit (10) further comprises: and the cathode of the second diode is connected to the grid electrode, and the anode of the second diode is grounded.
7. The negative control circuit according to claim 2, characterized in that the negative control circuit (10) further comprises: and one end of the fourth resistor is connected with the battery anode interface (11), and the other end of the fourth resistor is connected with the second base electrode.
8. A negative electrode control method for a commercial vehicle mounting system, characterized in that the negative electrode control method is applied to the negative electrode control circuit for a commercial vehicle mounting system according to any one of claims 1 to 7, the negative electrode control method comprising: after the loading system is electrified, detecting the voltage of the storage battery in real time, and judging whether the voltage of the storage battery is in a normal range or not; When the voltage of the storage battery is in the normal range, the controller controls the field effect transistor to be conducted, and controls the output interface to be communicated with the battery cathode interface (12); controlling the on-off state of the field effect transistor according to the relation between the voltage of the storage battery and the first voltage threshold value; when the voltage of the storage battery is greater than or equal to the first voltage threshold value, the field effect transistor is kept on, and/or When the voltage of the storage battery is smaller than the first voltage threshold, the controller controls the field effect transistor to be turned off, and the loading system enters an early warning stage; And after the early warning stage is finished, the controller controls the field effect transistor to be conducted again, and controls the on-off state of the field effect transistor according to the relation between the voltage of the storage battery and the first voltage threshold value.
9. The anode control method according to claim 8, characterized in that the anode control method further comprises: Acquiring the real-time temperature of the field effect transistor; Controlling the on-off state of the field effect transistor according to the relation between the real-time temperature and the first temperature threshold; when the real-time temperature is greater than the first temperature threshold, the gate voltage of the field effect transistor drops to an off voltage threshold, and the field effect transistor is automatically turned off.

Description

Negative electrode control circuit and method for commercial vehicle loading system Technical Field The invention relates to the technical field of electronic control, in particular to a negative electrode control circuit for a commercial vehicle loading system and a negative electrode control method for the commercial vehicle loading system. Background The commercial vehicle is used as core equipment in the fields of logistics transportation, public transportation and the like, the stability of a low-voltage power supply system of the commercial vehicle directly influences the operation efficiency of the vehicle, a 24V lead-acid storage battery is generally used as a low-voltage power supply for the whole vehicle and an upper assembly system after the vehicle is flameout at present, the upper assembly system of the commercial vehicle generally comprises a plurality of electric equipment such as a parking air conditioner, an entertainment system and professional operation electric appliances, the equipment still needs to continuously work after the vehicle is flameout, and high requirements are put forward on the cruising ability of the storage battery. However, the existing commercial vehicle battery management mode is rough, and the problem of overdischarge of the storage battery frequently occurs due to the lack of an effective charge-discharge monitoring mechanism, and meanwhile, the capacity of the battery is greatly attenuated, the service life is obviously shortened, and even the battery is directly damaged after the lead-acid storage battery is subjected to overdischarge for a plurality of times due to the characteristics of the lead-acid storage battery. However, the prior art has at least one problem that a lead-acid storage battery manager is usually installed in the prior art, but the cost is still higher, the current industry has extremely low loading proportion, only the voltage and electric quantity detection function can be realized, the load switch cannot be directly controlled, and the problem of overdischarge cannot be fundamentally solved. Disclosure of Invention The invention solves the technical problems that the lead-acid storage battery manager can only realize the functions of voltage and electric quantity detection, can not directly control a load switch and can not fundamentally solve overdischarge. In order to solve the problems, the invention provides a cathode control circuit for a commercial vehicle mounting system, which is provided with a battery cathode interface, a battery cathode interface and an output interface, wherein the battery cathode interface is connected with the anode of a storage battery, the battery cathode interface is connected with the cathode of the storage battery, the output interface is connected with the cathode of electric equipment, the cathode control circuit comprises a field effect transistor, the field effect transistor is provided with a grid electrode, a drain electrode and a source electrode, the grid electrode is connected with the battery cathode interface, the drain electrode is connected with the output interface, the source electrode is connected with the battery cathode interface, and the controller detects the voltage of the storage battery in real time and controls the on and off of the field effect transistor according to the voltage of the storage battery, so as to control the communication state of the output interface and the battery cathode interface. The technical scheme has the advantages that the negative electrode control circuit is provided with three interfaces, the core combination of the field effect transistor and the controller is adopted, the structure is extremely simple, the manufacturing cost is greatly reduced, the design of the three interfaces enables the negative electrode control circuit to be convenient to install, the storage battery and the upper electric equipment can be directly connected, the 24V lead-acid storage battery commercial vehicle is adapted, compatibility is extremely strong, the connection state of the output interface and the battery negative electrode interface is directly determined by the connection and disconnection of the field effect transistor, the power supply on-off of the electric equipment of the upper system is further controlled, compared with the traditional mechanical switch, the field effect transistor has the advantages of high response speed, no contact abrasion and low power consumption, the frequent on-off requirement of the upper system of the commercial vehicle can be adapted, the linkage of voltage real-time detection and the switch control of the field effect transistor is realized through the controller, a closed loop mechanism of detection-judgment-control is formed, and compared with the traditional scheme which can only be detected, an overdischarge path can be cut off from a source, the protection is more direct and efficient, and the problem that the storage batt