CN219533665U - Vehicle-mounted charger control circuit - Google Patents

Abstract

The application relates to a vehicle-mounted charger control circuit, wherein a driving signal input end of an LLC resonance module is connected with a driving signal output end of an LLC resonance control module, a current signal output end of the LLC resonance module is connected with a current signal input end of a current detection module, a detection signal output end of the current detection module is connected with a detection signal input end of an ESP32 control module, a resonance control output end of the ESP32 control module is connected with a signal input end of the LLC resonance control module, the ESP32 control module is used for receiving a current signal detected by the current detection module and controlling the LLC resonance control module in a feedback manner, the LLC resonance control module is used for driving the LLC resonance module to be turned on or off, and the current detection module is used for detecting current output by the LLC resonance module, so that current fluctuation output by the LLC resonance module to a battery is ensured to be smaller, the battery can be better prolonged in service life, and user experience is better.

Description

Vehicle-mounted charger control circuit

[ field of technology ]

The application relates to the technical field of new energy automobiles, in particular to a vehicle-mounted charger control circuit.

[ background Art ]

ESP32 singlechip is specially designed for mobile equipment, wearable electronic products and Internet of things application, has the singlechip of high-level low-power consumption performance in the industry, integrates functions of an antenna switch, an RF radio frequency, a power amplifier, a receiving low-noise amplifier, a filter, a power management module and the like, can realize strong processing performance and reliable safety performance with few peripheral devices, has Wi-Fi & Bluetooth functions, can realize fine resolution clock gating, power saving mode, dynamic voltage adjustment and the like, and has higher reaction speed and simpler control mode compared with the traditional singlechip such as STM 32.

The vehicle-mounted charger is fixedly arranged on the electric automobile, has the capability of safely and automatically fully charging a power battery of the electric automobile, can dynamically adjust charging current or voltage parameters according to data provided by a Battery Management System (BMS), executes corresponding actions and completes a charging process.

However, the existing vehicle-mounted charger often adopts a self-closed loop control mode, and when the LLC circuit is controlled, the self-closed loop circuit is often influenced by the outside, so that fluctuation of output control is caused, and the fluctuation of output current is larger, so that the fluctuation of current charged into the battery is large, and the service life of the battery is seriously influenced.

In addition, the existing vehicle-mounted charger control circuit cannot well check the states of the vehicle-mounted charger and the vehicle battery in time through a remote system, and cannot realize functions of monitoring in real time by a user using the mobile terminal in different places, adjusting operation parameters of the frequency converter and the like.

[ utility model ]

In order to solve the problem that when the traditional vehicle-mounted charger controls an LLC circuit, the fluctuation of the output current is large, so that the fluctuation of the current charged into the battery is large, and the service life of the battery is seriously influenced.

The utility model provides the following scheme:

the utility model provides a vehicle-mounted charger control circuit, includes LLC resonance module, LLC resonance control module, current detection module and ESP32 control module, LLC resonance module's drive signal input end with LLC resonance control module's drive signal output end is connected, LLC resonance module's current signal output end with current detection module's current signal input end is connected, current detection module's detected signal output end with ESP32 control module's detected signal input end is connected, ESP32 control module's resonance control output end with LLC resonance control module's signal input part is connected, ESP32 control module is used for receiving current signal that current detection module detected and feedback control LLC resonance control module, LLC resonance control module is used for the drive LLC resonance module switches on or off, current detection module is used for detecting LLC resonance module output's electric current.

The vehicle-mounted charger control circuit further comprises an EMI module and a rectifying module, wherein the rectifying module comprises a rectifying bridge U30, a first alternating current input end of the rectifying bridge U30 is connected with a live wire of a power grid, a second alternating current input end of the rectifying bridge U30 is connected with a zero line of the power grid, a capacitor CX3 is connected in parallel between the first alternating current input end and the second alternating current end of the rectifying bridge U30, a piezoresistor RV4 is connected in parallel between the first alternating current input end and the second alternating current end of the rectifying bridge U30, the EMI module comprises an inductor LX10, a first homonymous end of the inductor LX10 is connected with a negative electrode of a direct current output end of the rectifying bridge U30, a second homonymous end of the inductor LX10 is connected with a positive electrode of the direct current output end of the rectifying bridge U30, a capacitor CY11 is connected between the first homonymous end and the second homonymous end of the inductor LX10 in parallel, a first homonymous end of the inductor LX10 is a positive electrode of a total power supply output end, and a second homonymous end of the inductor LX10 is a negative electrode of the total power supply 12 is connected with a negative electrode of the total power supply.

According to the vehicle-mounted charger control circuit, the LLC resonance control module comprises the first MOS tube driving chip U34 and the second MOS tube driving chip U35, a capacitor C167 is connected between the bootstrap signal end of the first MOS tube driving chip U34 and the power input end of the first MOS tube driving chip U34, the high-order signal input end of the first MOS tube driving chip U34 is connected with the first driving signal end of the ESP32 control module, the low-order signal input end of the first MOS tube driving chip U34 is connected with the second driving signal end of the ESP32 control module, a capacitor C167 is connected between the high-order floating end of the first MOS tube driving chip U34 and the cathode end of the diode D56, the bootstrap signal end of the second MOS tube driving chip U35 is connected with the first high-order floating end of the LLC resonance module, a diode D57 is connected between the bootstrap signal end of the second MOS tube driving chip U35 and the power input end of the second MOS tube driving chip U35, the bootstrap signal end of the second MOS tube driving chip U35 is connected with the high-order floating end of the ESP32, and the second MOS tube driving chip U35 is connected with the high-order floating end of the second MOS tube driving chip, and the ESP driving end of the second MOS tube driving chip U35 is connected with the high-order floating end of the second MOS tube driving chip, and the ESP driving module is connected with the high-order floating end of the second MOS tube driving end of the ESP module, and the ESP driving module.

The LLC power conversion unit comprises a MOS tube Q3, a MOS tube Q4, a MOS tube Q7 and a MOS tube Q8, wherein the drain electrode of the MOS tube Q3 is connected with the positive electrode of the total power output end, a resistor R1 is connected between the grid electrode of the MOS tube Q3 and the source electrode of the MOS tube Q3, a capacitor C7 is connected between the drain electrode of the MOS tube Q3 and the source electrode of the MOS tube Q3, the grid electrode of the MOS tube Q3 is connected with the high-order signal output end of the first MOS tube driving chip U34, the common node of the source electrode of the MOS tube Q3 and the drain electrode of the MOS tube Q7 is the first high-order floating end of the LLC power conversion module, the source electrode of the MOS tube Q7 is connected with the negative electrode of the total power output end, a resistor R32 is connected between the grid electrode of the MOS tube Q7 and the source electrode of the MOS tube Q7, a capacitor C11 is connected between the drain electrode of the MOS tube Q7 and the source electrode of the MOS tube Q7, the grid electrode of the MOS tube Q7 is connected with the low-order signal output end of the first MOS tube driving chip U34, the drain electrode of the MOS tube Q4 is connected with the positive electrode of the total power supply output end, a resistor R20 is connected between the grid electrode of the MOS tube Q4 and the source electrode of the MOS tube Q4, a capacitor C8 is connected between the drain electrode of the MOS tube Q4 and the source electrode of the MOS tube Q4, the grid electrode of the MOS tube Q4 is connected with the high-order signal output end of the second MOS tube driving chip U35, the common node of the source electrode of the MOS tube Q4 and the drain electrode of the MOS tube Q8 is the second high-order floating end of the LLC resonant module, the source electrode of the MOS tube Q8 is connected with the negative electrode of the total power supply output end, a resistor R33 is connected between the grid electrode of the MOS tube Q8 and the source electrode of the MOS tube Q8, a capacitor C12 is connected between the drain electrode of the MOS tube Q8 and the source electrode of the MOS tube Q8, and the grid electrode of the MOS tube Q8 is connected with the low-order signal output end of the second MOS tube driving chip U35.

The vehicle-mounted charger control circuit, the LLC resonant module also comprises an LCC power supply output unit, the LCC power supply output unit comprises an inductor L3, a transformer T1, a transformer T2, a diode D10, a diode D11, a diode D14, a diode D15, a common-mode inductor L51, a constantan wire R380, a relay RY2, a resistor R18 and an LLC power supply output end, the first end of the inductor L3 is connected with the first high-level floating ground end of the LLC resonant module, an inductor L4 is connected between the second end of the inductor L3 and the first end of the primary winding of the transformer T1, a capacitor C14 is connected in parallel between the second end of the primary winding of the transformer T2 and the second high-level floating ground end of the LLC resonant module, a piezoresistor RV3 is connected in parallel between the second end of the primary winding of the transformer T2 and the second high-level floating ground end of the LLC resonant module, a resistor group is connected in parallel between the second end of the primary winding of the transformer T2 and the second high-order floating ground end of the LLC resonant module, the resistor group is formed by connecting at least more than one resistor in series, the common node of the diode D10 and the diode D11 is connected with the first end of the secondary winding of the transformer T1, the common node of the diode D10 and the diode D11 is connected with the first end of the secondary winding of the transformer T2, the common node of the diode D14 and the diode D15 is connected with the second end of the secondary winding of the transformer T1, the common node of the diode D14 and the diode D15 is connected with the second end of the secondary winding of the transformer T2, the common node of the diode D10 and the diode D15 is connected with the first homonymous end of the common mode inductor L51, at least more than one resistor is connected in parallel between the common node of the diode D11 and the diode D14 and the second homonymous end of the common mode inductor L51, the common node of the diode D11 and the diode D14 is connected in parallel with at least one capacitor between the second homonymous end of the common mode inductance L51, at least one capacitor is connected in parallel with the homonymous end of the common mode inductance L51, the first homonymous end of the common mode inductance L51 is connected with the first end of the conduction end of the relay RY2, the second homonymous end of the common mode inductance L51 is connected with the first end of the constantan wire R380, the second end of the constantan wire R380 is connected with the negative electrode of the LLC power output end, the diode D12 and the resistor R27 are sequentially connected in series between the second end of the conduction end of the relay RY2 and the first end of the conduction end of the relay RY2, the first end of the controlled end of the relay RY2 is connected with the LLC power output signal end of the ESP32 control module, the first end of the controlled end of the relay RY2 is connected with the second end of the controlled end of the relay RY2, the second end of the relay R18 is connected with the common resistor R18, and the common resistor R18 is connected between the second end of the relay RY2 and the second end of the common resistor R18.

The vehicle-mounted charger control circuit comprises the operational amplifier chip U33, the resistor R388, the resistor R386 and the resistor R385, wherein the second output end of the operational amplifier chip U33 is connected with the first end of the resistor R388, the second end of the resistor R388 is connected with the current sampling port of the ESP32 control module, the second reverse input end of the operational amplifier chip U33 is connected with the first end of the resistor R386, the second end of the resistor R386 is connected with the first current sampling point of the LLC resonance module, the second homodromous input end of the operational amplifier chip U33 is connected with the first end of the resistor R385, the second end of the resistor R385 is connected with the second current sampling point of the LLC resonance module, and a resistor R387 is connected between the second output end of the operational amplifier chip U33 and the first current sampling point of the LLC resonance module.

The vehicle-mounted battery charger control circuit further comprises an auxiliary power supply module, wherein the auxiliary power supply module comprises a first voltage stabilizing chip U32, a second voltage stabilizing chip U31, an inductor L10, a resistor R376 and a resistor R378, the first end of the resistor R378 is connected with the positive electrode end of the output end of the total power supply, a resistor R379 is connected between the second end of the resistor R378 and the ground, a common node of the resistor R378 and the resistor R379 is connected with the power supply input end of the first voltage stabilizing chip U32, at least more than one capacitor is connected between the power supply input end of the first voltage stabilizing chip U32 and the ground, a diode D55 is connected between the power supply output end of the first voltage stabilizing chip U32 and the ground, the power supply output end of the first voltage stabilizing chip U32 is connected with the first end of the inductor L10, the second end of the inductor L10 is connected with the first end of the resistor R376, a resistor R16 is connected between the second end of the resistor R376 and the ground, at least one capacitor is connected between the power supply input end of the resistor R376 and the first voltage stabilizing chip U31 and the second voltage stabilizing chip, and at least one capacitor is connected between the power supply input end of the resistor U31 and the second voltage stabilizing chip.

The vehicle-mounted charger control circuit further comprises a PFC control module, the PFC control module comprises a third MOS tube driving chip U38, a diode D59 is connected between a bootstrap signal end of the third MOS tube driving chip U38 and a power input end of the third MOS tube driving chip U38, a high-order signal input end of the third MOS tube driving chip U38 is connected with a fifth driving signal end of the ESP32 control module, a low-order signal input end of the third MOS tube driving chip U38 is connected with a sixth driving signal end of the ESP32 control module, and a capacitor C174 is connected between a high-order floating end of the third MOS tube driving chip U38 and a negative electrode end of the diode D59.

The vehicle-mounted charger control circuit further comprises a PFC module, the PFC module comprises an inductor L11, a MOS tube Q59, a MOS tube Q60, a PFC constantan R381 and a PFC power supply output end, a first end of the inductor L11 is connected with the positive electrode of the total power supply output end, a common node of a drain electrode of the MOS tube Q59 and a source electrode of the MOS tube Q60 is connected with a second end of the inductor L11, two ends of the inductor L11 are connected with a diode D58 in parallel, a common node of the drain electrode of the MOS tube Q59 and the source electrode of the MOS tube Q60 is connected with a high-order floating end of the third MOS tube driving chip U38, the source electrode of the MOS tube Q59 is grounded, a gate electrode of the MOS tube Q59 is connected with a low-order signal output end of the third MOS tube driving chip U38, a drain electrode of the MOS tube Q60 is connected with the positive electrode of the PFC power supply output end, and at least one drain electrode of the PFC constantan R381 is connected with the high-order signal output end of the third MOS tube driving chip U38 in parallel.

The main control chip of the ESP32 control module is particularly an ESP8266.

According to the embodiment of the utility model, the LLC resonance module is connected with the current detection module, the signal detected by the current detection module is transmitted to the ESP32 control module, the ESP32 control module adjusts the control signal of the LLC resonance control module, and finally adjusts the current signal output by the LLC resonance module, so that the current fluctuation output by the LLC resonance module to the battery is ensured to be smaller, the service life of the battery can be better prolonged, the ESP32 control module is adopted, and a user can conveniently check the charging condition and the battery state of the vehicle in real time through the remote control function of the ESP32 control module, and the user experience is better.

[ description of the drawings ]

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a block diagram of a control circuit of a vehicle-mounted charger according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of an LLC resonant module according to an embodiment of the utility model;

FIG. 3 is a schematic diagram of an LLC resonant control module according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of a current detection module according to an embodiment of the utility model;

FIG. 5 is a schematic diagram of an EMI module and rectifier module of an embodiment of the present utility model;

FIG. 6 is a schematic diagram of an auxiliary power module according to an embodiment of the utility model;

fig. 7 is a schematic diagram of a PFC control module according to an embodiment of the present utility model;

fig. 8 is a schematic diagram of a PFC module according to an embodiment of the present utility model.

[ detailed description ] of the utility model

Referring to fig. 1 to 8, this embodiment proposes a vehicle-mounted battery charger control circuit, which includes an LLC resonant module, an LLC resonant control module, a current detection module, and an ESP32 control module, where a driving signal input end of the LLC resonant module is connected to a driving signal output end of the LLC resonant control module, a current signal output end of the LLC resonant module is connected to a current signal input end of the current detection module, a detection signal output end of the current detection module is connected to a detection signal input end of the ESP32 control module, a resonant control output end of the ESP32 control module is connected to a signal input end of the LLC resonant control module, the ESP32 control module is configured to receive a current signal detected by the current detection module and feedback control the LLC resonant control module, the LLC resonant control module is driven to be turned on or off, and the current detection module is configured to detect a current output by the LLC resonant module.

According to the embodiment, the LLC resonance module is connected with the current detection module, signals detected by the current detection module are transmitted to the ESP32 control module, the ESP32 control module adjusts control signals of the LLC resonance control module, and finally adjusts current signals output by the LLC resonance module, so that current fluctuation of the LLC resonance module output to a battery is ensured to be small, the battery can be better prolonged in service life, the ESP32 control module is adopted, a user can conveniently check the charging condition and the battery state of the vehicle in real time through the remote control function of the ESP32 control module, and the user experience is better.

The ESP32 control module adopted in the embodiment has stable performance, and the working temperature range reaches-40 ℃ to +125 ℃. The integrated self-calibration circuit realizes dynamic voltage adjustment, can eliminate defects of an external circuit and adapt to changes of external conditions, integrates functions of an antenna switch, an RFbalun, a power amplifier, a receiving low-noise amplifier, a filter, a power management module and the like, can realize powerful processing performance, reliable safety performance and Wi-Fi & Bluetooth functions with few peripheral devices, and has high-level low-power consumption performance in the industry, including fine resolution clock gating, power saving mode, dynamic voltage adjustment and the like.

As a preferred solution, but not particularly limited, the EMI module further includes an EMI module and a rectifying module, where the rectifying module includes a rectifying bridge U30, a first ac input end of the rectifying bridge U30 is connected with a live wire of the power grid, a second ac input end of the rectifying bridge U30 is connected with a zero line of the power grid, a capacitor CX3 is connected in parallel between the first ac input end and the second ac end of the rectifying bridge U30, a varistor RV4 is connected in parallel between the first ac input end and the second ac end of the rectifying bridge U30, the EMI module includes an inductor LX10, a first homonym end of the inductor LX10 is connected with a negative electrode of the dc output end of the rectifying bridge U30, a second homonym end of the inductor LX10 is connected with a positive electrode of the dc output end of the rectifying bridge U30, a capacitor CY11 is connected between the first homonym end and the second homonym end of the inductor LX10 in parallel, a first heteronym end of the inductor LX10 is a positive electrode of the total power output end, and a second homonym end of the inductor LX10 is a negative electrode of the total power supply CY12 is connected with a capacitor CY12.

In the embodiment, the rectification circuit is used for rectifying the alternating current of the power grid, so that the power supply of a later-stage direct current circuit is facilitated, and in order to enable the circuit to be more stable, the alternating current side of the rectification bridge is connected with the filter capacitor and the piezoresistor in parallel for protecting the safe operation of the circuit, and then the EMI module is connected, and the EMI module adopts a pi-type filter circuit for improving the EMI performance of the circuit.

The specific type of rectifier bridge adopted in this embodiment is GBU808, which can withstand 800V and rectify current 8A, its forward voltage drop is 1V, reverse current is 5uA, forward surge current is 200A, and working temperature: -55 ℃ to +150 ℃.

As a preferred solution, but not specifically limited, the LLC resonant control module includes a first MOS transistor driving chip U34 and a second MOS transistor driving chip U35, where a diode D56 is connected between a bootstrap signal end of the first MOS transistor driving chip U34 and a power input end of the first MOS transistor driving chip U34, a high-order signal input end of the first MOS transistor driving chip U34 is connected to a first driving signal end of the ESP32 control module, a low-order signal input end of the first MOS transistor driving chip U34 is connected to a second driving signal end of the ESP32 control module, a capacitor C167 is connected between a high-order floating end of the first MOS transistor driving chip U34 and a negative electrode end of the diode D56, a bootstrap signal end of the second MOS transistor driving chip U35 is connected to a first high-order ground end of the LLC resonant module, a bootstrap signal end of the second MOS transistor driving chip U35 is connected to a power input end of the second MOS transistor driving chip U35, a bootstrap signal end of the second MOS transistor driving chip U35 is connected to a high-order floating end of the second MOS transistor driving chip U35, and a capacitor C167 is connected between a high-order floating end of the second MOS transistor driving chip U35 and a negative electrode end of the second MOS transistor driving chip D56, and a capacitor C167 is connected to a high-order floating end of the second MOS diode driving chip D57.

The LLC resonance control module of the embodiment adopts EG3013 grid drive ICs produced by two EG companies, the inside of the chip is provided with a circuit for digital logic processing, the PWM input can be better processed, the dead zone control circuit can ensure that two paths of MOS tubes cannot generate interference accidents, and the pulse filter circuit can enable the output waveform to be smoother. The working voltage range of the chip is wider, the static power consumption is only 4.5mA, and the control of the circuit can be better realized.

As a preferred embodiment, but not particularly limited thereto, the LLC resonant module includes an LLC power conversion unit 1, the LLC power conversion unit 1 includes a MOS transistor Q3, a MOS transistor Q4, a MOS transistor Q7, and a MOS transistor Q8, a drain of the MOS transistor Q3 is connected to an anode of the main power output terminal, a resistor R1 is connected between a gate of the MOS transistor Q3 and a source of the MOS transistor Q3, a capacitor C7 is connected between a drain of the MOS transistor Q3 and a source of the MOS transistor Q3, a gate of the MOS transistor Q3 is connected to a high-order signal output terminal of the first MOS transistor driving chip U34, a common node between a source of the MOS transistor Q3 and a drain of the MOS transistor Q7 is a first high-order floating terminal of the LLC resonant module, a source of the MOS transistor Q7 is connected to a cathode of the main power output terminal, a resistor R32 is connected between a gate of the MOS transistor Q7 and a source of the MOS transistor Q3, a drain of the MOS transistor Q7 is connected to a drain of the transistor Q4, a capacitor C11 is connected to a drain of the MOS transistor Q4 and a drain of the MOS transistor Q8, a common node between a drain of the MOS transistor Q4 and a drain of the MOS transistor Q4 is connected to a drain of the MOS transistor Q8, a drain of the MOS transistor Q4 is connected to a drain of the MOS transistor Q4, a drain of the MOS transistor Q7 is connected to a cathode of the MOS transistor Q7, and the grid electrode of the MOS tube Q8 is connected with the low-order signal output end of the second MOS tube driving chip U35.

According to the embodiment, the direct current power supply is converted into the alternating current power supply through the two groups of MOS tube circuits with opposite directions, DC-DC conversion can be well achieved through the soft switch, and high power supply conversion efficiency is kept.

As a preferred solution, but not particularly limited, the LLC resonant module further comprises an LCC power output unit 2, where the LCC power output unit 2 includes an inductor L3, a transformer T1, a transformer T2, a diode D10, a diode D11, a diode D14, a diode D15, a common mode inductor L51, a constantan wire R380, a relay RY2, a resistor R18, and an LLC power output terminal, where a first end of the inductor L3 is connected to a first high-level floating terminal of the LLC resonant module, an inductor L4 is connected between a second end of the inductor L3 and a first end of a primary winding of the transformer T1, a parallel capacitor C14 is connected between a second end of a primary winding of the transformer T2 and a second high-level floating terminal of the LLC resonant module, a parallel resistor RV3 is connected between a second end of a primary winding of the transformer T2 and a second high-level floating terminal of the LLC resonant module, a common node D11 is connected to a common node D11 of the transformer D1 and a common node D14, a common node D11 is connected to a second end of the transformer T2 and a common node D11, and a common node D10 is connected to the common node D11, and a common node D11 is connected to the common node D11, the common node of the diode D11 and the diode D14 is connected in parallel with at least one capacitor between the second homonymous end of the common mode inductance L51, at least one capacitor is connected in parallel with the homonymous end of the common mode inductance L51, the first homonymous end of the common mode inductance L51 is connected with the first end of the conduction end of the relay RY2, the second homonymous end of the common mode inductance L51 is connected with the first end of the constantan wire R380, the second end of the constantan wire R380 is connected with the negative electrode of the LLC power output end, the diode D12 and the resistor R27 are sequentially connected in series between the second end of the conduction end of the relay RY2 and the first end of the conduction end of the relay RY2, the first end of the controlled end of the relay RY2 is connected with the LLC power output signal end of the ESP32 control module, the first end of the controlled end of the relay RY2 is connected with the second end of the controlled end of the relay RY2, the second end of the relay R18 is connected with the common resistor R18, and the common resistor R18 is connected between the second end of the relay RY2 and the second end of the common resistor R18.

In this embodiment, voltage conversion is performed through the transformer, output is performed after rectification is performed through the rectifier bridge, and then filtering is performed through a pi-type network, so that a better DC-DC conversion effect is achieved, and a constantan wire is connected to the tail end of the LCC power output unit 2 to sample current, so that the current size can be accurately determined.

In this embodiment, in order to facilitate current detection, a network interface CS on a constantan wire is defined as a first current sampling point, and a power output end cathode of the LCC power output unit 2 is defined as a second current sampling point.

As a preferred solution, but not particularly limited, the current detection module includes an op-amp chip U33, a resistor R388, a resistor R386, and a resistor R385, where a second output end of the op-amp chip U33 is connected to a first end of the resistor R388, a second end of the resistor R388 is connected to a current sampling port of the ESP32 control module, a second inverting input end of the op-amp chip U33 is connected to the first end of the resistor R386, a second co-directional input end of the op-amp chip U33 is connected to a first current sampling point of the LLC resonant module, a second end of the resistor R385 is connected to a second current sampling point of the LLC resonant module, and a resistor R387 is connected between the second output end of the op-amp chip U33 and the first current sampling point of the LLC resonant module.

In this embodiment, the signal is transmitted to the ESP32 controller after the signal processing is performed on the current once by using the operational amplifier, and the LMC6482 chip is used in this embodiment, so that the power output by the LCC power output unit 2 can be converted relatively accurately, so that the control is more accurate.

As a preferred solution, but not particularly limited, the power supply module further includes an auxiliary power supply module, where the auxiliary power supply module includes a first voltage stabilizing chip U32, a second voltage stabilizing chip U31, an inductor L10, a resistor R376, and a resistor R378, a first end of the resistor R378 is connected to the positive electrode end of the total power supply output end, a resistor R379 is connected between a second end of the resistor R378 and ground, a common node of the resistor R378 and the resistor R379 is connected to a power supply input end of the first voltage stabilizing chip U32, at least one capacitor is connected between a power supply input end of the first voltage stabilizing chip U32 and ground, a diode D55 is connected between a power supply output end of the first voltage stabilizing chip U32 and ground, a power supply output end of the first voltage stabilizing chip U32 is connected to a first end of the inductor L10, a second end of the inductor L10 is connected to a first end of the resistor R376, a resistor R16 is connected between a second end of the resistor R376 and ground, at least one capacitor is connected between a power supply input end of the first voltage stabilizing chip U32 and the second voltage stabilizing chip U31, and at least one capacitor is connected between a power supply input end of the first voltage stabilizing chip U31 and the second voltage stabilizing chip U31.

In this embodiment, in order to provide a stable working environment for the chip circuit, the linear voltage stabilizing chip is additionally provided to provide an initial stabilizing current for the control circuit, so that the circuit is stable and gentle to enter into a working state. In this embodiment, since the LLC resonant control module and the PFC control module need to provide +12v voltage, the main control chip needs to provide +3v voltage, and a path of power is led out from the input portion separately, the DC-DC voltage reduction chip XL7005A manufactured by the carrier company is selected to reduce the input power to +12v, and supply power to the driving circuit, and the chip has a relatively wide input voltage, so that the application in the design is relatively suitable. The LDO chip AMS1117-3.3 of AMS company is adopted in the part requiring +3.3V voltage, the maximum voltage of input can be +15V, the output voltage difference is 1.1V, the maximum output is 3.399V, the minimum output is 3.201V, and the circuit can operate more stably and has better control effect.

As a preferred solution, but not particularly limited, the PFC control module further includes a third MOS transistor driving chip U38, a diode D59 is connected between a bootstrap signal end of the third MOS transistor driving chip U38 and a power input end of the third MOS transistor driving chip U38, a high-order signal input end of the third MOS transistor driving chip U38 is connected with a fifth driving signal end of the ESP32 control module, a low-order signal input end of the third MOS transistor driving chip U38 is connected with a sixth driving signal end of the ESP32 control module, and a capacitor C174 is connected between a high-order floating end of the third MOS transistor driving chip U38 and a negative electrode end of the diode D59.

The PFC control module of the embodiment adopts EG3013 grid drive IC produced by EG company, the chip is internally provided with a circuit for digital logic processing, so that the input PWM can be better processed, the dead zone control circuit can ensure that two paths of MOS tubes cannot generate interference accidents, and the pulse filter circuit can enable the output waveform to be smoother. The working voltage range of the chip is wider, the static power consumption is only 4.5mA, and the control of the circuit can be better realized.

As a preferred solution, but not particularly limited, the PFC module further includes a PFC module, where the PFC module includes an inductor L11, a MOS transistor Q59, a MOS transistor Q60, a PFC constantan R381, and a PFC power supply output end, a first end of the inductor L11 is connected to an anode of the total power supply output end, a common node between a drain of the MOS transistor Q59 and a source of the MOS transistor Q60 is connected to a second end of the inductor L11, two ends of the inductor L11 are connected in parallel to a diode D58, a common node between a drain of the MOS transistor Q59 and a source of the MOS transistor Q60 is connected to an upper floating end of the third MOS transistor driving chip U38, a source of the MOS transistor Q59 is grounded, a gate of the MOS transistor Q59 is connected to an upper signal output end of the third MOS transistor driving chip U38, a gate of the MOS transistor Q60 is connected to a lower signal output end of the third MOS transistor driving chip U38, a drain of the MOS transistor Q60 is connected to an anode of the PFC power supply output end, and at least one end of the PFC copper 381 is connected to a cathode of the PFC power supply output end of the third MOS transistor driving chip U38.

The PFC module in this embodiment is specifically a power factor correction circuit, which is configured to increase a power factor of the circuit, where an increase in the power factor means a decrease in reactive power, and an increase in active power, which represents a decrease in an imaginary part and an increase in a real part of load impedance.

In this embodiment, in order to facilitate the implementation of the completed charging function of the charger, a simplest BOOST circuit is adopted, the source electrode of the BOOST circuit is grounded, no bootstrap and isolation are needed, a certain boosting capability is provided, and a synchronous rectification mode is adopted, and an MOS tube is used to replace a diode, so that the energy efficiency value can be up to more than 97%.

As a priority scheme, but not particularly limited, the main control chip of the ESP32 control module is particularly an ESP8266.

The core processor ESP8266 of the ESP32 control module in the embodiment integrates the industry leading Tensilical106 ultra-low power consumption 32-bit micro MCU with 16-bit reduced mode in smaller-size package, supports 80MHz and 160MHz in main frequency, supports RTOS, and integrates Wi-FiMAC/B/RF/PA/LNA on-board antenna.

The ESP32 control module supports standard IEEE802.11b/g/n protocol, complete TCP/IP protocol stack, and the user can use the module to add networking function to the existing equipment, and can also construct an independent network controller.

The power supply voltage of the ESP32 control module is direct current of 3.3V and current above 500mA, the maximum output current of a Wi-Fi unit IO of the ESP32 control module is 12mA, and is effective at the low level of an NRST pin, and is effective at the high level of an EN enabling pin.

The above description of one embodiment provided in connection with the specific content does not set forth a limitation on the practice of the application. The method, structure, etc. similar to or identical to those of the present application, or some technical deductions or substitutions are made on the premise of the inventive concept, should be regarded as the protection scope of the present application.

Claims (10)

1. The utility model provides a vehicle-mounted machine control circuit, its characterized in that includes LLC resonance module, LLC resonance control module, current detection module and ESP32 control module, the drive signal input of LLC resonance module with the drive signal output of LLC resonance control module connects, the current signal output of LLC resonance module with the current signal input of current detection module connects, the detection signal output of current detection module with the detection signal input of ESP32 control module connects, the resonance control output of ESP32 control module with the signal input of LLC resonance control module connects, ESP32 control module is used for receiving the current signal that current detection module detected and feedback control LLC resonance control module, LLC resonance control module is used for driving LLC resonance module switches on or off, current detection module is used for detecting the electric current of LLC resonance module output.

2. The vehicle-mounted charger control circuit according to claim 1, further comprising an EMI module and a rectifying module, wherein the rectifying module comprises a rectifying bridge U30, a first ac input end of the rectifying bridge U30 is connected with a live wire of a power grid, a second ac input end of the rectifying bridge U30 is connected with a zero line of the power grid, a capacitor CX3 is connected in parallel between the first ac input end and the second ac end of the rectifying bridge U30, a varistor RV4 is connected in parallel between the first ac input end and the second ac end of the rectifying bridge U30, the EMI module comprises an inductor LX10, a first homonym end of the inductor LX10 is connected with a negative electrode of a dc output end of the rectifying bridge U30, a second homonym end of the inductor LX10 is connected with an anode of the dc output end of the rectifying bridge U30, a capacitor CY11 is connected in parallel between the first homonym end and the second homonym end of the inductor LX10, the first homonym end of the inductor LX10 is the anode of the total power supply output end of the inductor LX10, and the second homonym end of the inductor LX10 is the cathode of the total power supply 12.

3. The vehicle-mounted charger control circuit according to claim 2, wherein the LLC resonant control module comprises a first MOS transistor driving chip U34 and a second MOS transistor driving chip U35, a diode D56 is connected between a bootstrap signal end of the first MOS transistor driving chip U34 and a power input end of the first MOS transistor driving chip U34, a high signal input end of the first MOS transistor driving chip U34 is connected with a first driving signal end of the ESP32 control module, a low signal input end of the first MOS transistor driving chip U34 is connected with a second driving signal end of the ESP32 control module, a capacitor C167 is connected between a high floating end of the first MOS transistor driving chip U34 and a negative electrode end of the diode D56, a bootstrap signal end of the second MOS transistor driving chip U35 is connected with a first high floating end of the LLC resonant module, a bootstrap signal end of the second MOS transistor driving chip U35 is connected with a second floating end of the second MOS transistor driving chip U35, a bootstrap signal end of the second MOS transistor driving chip U35 is connected with a second floating end of the second diode driving module U35, and a capacitor C167 is connected between a high floating end of the second MOS transistor driving chip U35 and a second floating end of the second diode driving module, and a capacitor C35 is connected between a high floating end of the second MOS transistor driving chip U35 and a second floating end of the second diode driving module.

4. The control circuit of the vehicle-mounted battery charger according to claim 3, wherein the LLC resonant module comprises an LLC power conversion unit, the LLC power conversion unit comprises a MOS transistor Q3, a MOS transistor Q4, a MOS transistor Q7 and a MOS transistor Q8, the drain electrode of the MOS transistor Q3 is connected with the positive electrode of the output end of the total power supply, a resistor R1 is connected between the grid electrode of the MOS transistor Q3 and the source electrode of the MOS transistor Q3, a capacitor C7 is connected between the drain electrode of the MOS transistor Q3 and the source electrode of the MOS transistor Q3, the gate electrode of the MOS transistor Q3 is connected with the high-order signal output end of the first MOS transistor driving chip U34, the common node between the source electrode of the MOS transistor Q3 and the drain electrode of the MOS transistor Q7 is the first high-order floating end of the LLC resonant module, the source electrode of the MOS transistor Q7 is connected with the negative electrode of the output end of the total power supply, a resistor R32 is connected between the gate electrode of the MOS transistor Q7 and the source electrode of the MOS transistor Q7, a capacitor C11 is connected between the drain electrode of the MOS transistor Q7 and the source electrode of the MOS transistor Q7, the grid electrode of the MOS transistor Q7 is connected with the low-order signal output end of the first MOS transistor driving chip U34, the drain electrode of the MOS transistor Q4 is connected with the positive electrode of the total power output end, a resistor R20 is connected between the grid electrode of the MOS transistor Q4 and the source electrode of the MOS transistor Q4, a capacitor C8 is connected between the drain electrode of the MOS transistor Q4 and the source electrode of the MOS transistor Q4, the grid electrode of the MOS transistor Q4 is connected with the high-order signal output end of the second MOS transistor driving chip U35, the common node between the source electrode of the MOS transistor Q4 and the drain electrode of the MOS transistor Q8 is the second high-order floating end of the LLC resonant module, the source electrode of the MOS transistor Q8 is connected with the negative electrode of the total power output end, a resistor R33 is connected between the grid electrode of the MOS transistor Q8 and the source electrode of the MOS transistor Q8, a capacitor C12 is connected between the drain electrode of the MOS transistor Q8 and the source electrode of the MOS transistor Q8, and the grid electrode of the MOS tube Q8 is connected with the low-order signal output end of the second MOS tube driving chip U35.

5. The control circuit according to claim 4, wherein the LLC resonant module further comprises an LCC power output unit, the LCC power output unit comprises an inductor L3, a transformer T1, a transformer T2, a diode D10, a diode D11, a diode D14, a diode D15, a common mode inductor L51, a constantan wire R380, a relay RY2, a resistor R18 and an LLC power output terminal, a first end of the inductor L3 is connected with a first high-order floating terminal of the LLC resonant module, an inductor L4 is connected between a second end of the inductor L3 and a first end of a primary winding of the transformer T1, a parallel capacitor C14 is connected between a second end of the primary winding of the transformer T2 and a second high-order floating terminal of the LLC resonant module, a parallel voltage RV3 is connected between a second end of the primary winding of the transformer T2 and a second high-order floating terminal of the LLC resonant module, a common node D1 is connected with the second end of the common node D1 and the diode D14, and a common node D1 is connected with the second end of the common node D1, at least one resistor is connected in parallel between the common node of the diode D11 and the diode D14 and the second common-name end of the common-mode inductor L51, at least one capacitor is connected in parallel between the common-name end of the common-mode inductor L51 and the two ends of the common-name end, the first different-name end of the common-mode inductor L51 is connected with the first end of the conducting end of the relay RY2, the second different-name end of the common-mode inductor L51 is connected with the first end of the constantan wire R380, the second end of the constantan wire R380 is connected with the negative electrode of the LLC power supply output end, the second end of the conducting end of the relay RY2 is sequentially connected with the diode D12 and the resistor R27 in series between the second end of the conducting end of the relay RY2 and the first end of the relay RY2, the controlled end of the relay RY2 is connected with the second end of the common-name end of the relay R18, and the controlled end of the common-name end of the relay R2 is connected with the second end of the common-name end of the resistor R18, and the controlled end of the common-name end of the relay R18 is connected with the common-name end of the resistor R2 is connected with the second end of the common-name end of the resistor R18.

6. The vehicle-mounted battery charger control circuit according to claim 1, wherein the current detection module comprises an operational amplifier chip U33, a resistor R388, a resistor R386 and a resistor R385, a second output end of the operational amplifier chip U33 is connected with a first end of the resistor R388, a second end of the resistor R388 is connected with a current sampling port of the ESP32 control module, a second reverse input end of the operational amplifier chip U33 is connected with the first end of the resistor R386, a second end of the resistor R386 is connected with a first current sampling point of the LLC resonant module, a second homodromous input end of the operational amplifier chip U33 is connected with the first end of the resistor R385, a second end of the resistor R385 is connected with a second current sampling point of the LLC resonant module, and a resistor R387 is connected between the second output end of the operational amplifier chip U33 and the first current sampling point of the LLC resonant module.

7. The vehicle-mounted battery charger control circuit according to claim 2, further comprising an auxiliary power supply module, wherein the auxiliary power supply module comprises a first voltage stabilizing chip U32, a second voltage stabilizing chip U31, an inductor L10, a resistor R376 and a resistor R378, a first end of the resistor R378 is connected with an anode end of the total power supply output end, a resistor R379 is connected between a second end of the resistor R378 and the ground, a common node of the resistor R378 and the resistor R379 is connected with a power supply input end of the first voltage stabilizing chip U32, at least more than one capacitor is connected between a power supply input end of the first voltage stabilizing chip U32 and the ground, a diode D55 is connected between a power supply output end of the first voltage stabilizing chip U32 and the ground, a power supply output end of the first voltage stabilizing chip U32 is connected with a first end of the inductor L10, a second end of the inductor L10 is connected with a first end of the resistor R376, a second end of the resistor R376 is connected with a second end of the resistor R376, at least one capacitor is connected between a second end of the resistor R376 and the ground, at least one capacitor is connected between a power supply input end of the first voltage stabilizing chip U31 and the second voltage stabilizing chip U31 and the power supply input end of the resistor U31, and at least one capacitor D55 is connected between the first voltage stabilizing chip and the power supply input end of the second voltage stabilizing chip.

8. The vehicle-mounted charger control circuit of claim 2, further comprising a PFC control module, wherein the PFC control module comprises a third MOS transistor driving chip U38, a diode D59 is connected between a bootstrap signal end of the third MOS transistor driving chip U38 and a power input end of the third MOS transistor driving chip U38, a high-order signal input end of the third MOS transistor driving chip U38 is connected with a fifth driving signal end of the ESP32 control module, a low-order signal input end of the third MOS transistor driving chip U38 is connected with a sixth driving signal end of the ESP32 control module, and a capacitor C174 is connected between a high-order floating end of the third MOS transistor driving chip U38 and a negative electrode end of the diode D59.

9. The vehicle-mounted battery charger control circuit of claim 8, further comprising a PFC module, wherein the PFC module comprises an inductor L11, a MOS tube Q59, a MOS tube Q60, a PFC constantan R381, and a PFC power supply output terminal, a first terminal of the inductor L11 is connected to an anode of the total power supply output terminal, a common node of a drain of the MOS tube Q59 and a source of the MOS tube Q60 is connected to a second terminal of the inductor L11, two ends of the inductor L11 are connected in parallel to a diode D58, a common node of a drain of the MOS tube Q59 and a source of the MOS tube Q60 is connected to a high-level floating terminal of the third MOS tube driving chip U38, a source of the MOS tube Q59 is grounded, a gate of the MOS tube Q59 is connected to a high-level signal output terminal of the third MOS tube driving chip U38, a gate of the MOS tube Q60 is connected to a low-level signal output terminal of the third MOS tube driving chip U38, a drain of the MOS tube Q60 is connected to a drain of the PFC output terminal of the PFC tube Q60 is connected to a high-level floating terminal of the third MOS tube driving chip U38, and at least one anode of the PFC output terminal is connected to the anode 381 is connected to the power supply terminal of the third power supply output terminal.

10. The vehicle-mounted charger control circuit of claim 1, wherein the main control chip of the ESP32 control module is specifically ESP8266.