CN212726525U - Automobile diagnostic instrument with charging function - Google Patents
Automobile diagnostic instrument with charging function Download PDFInfo
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- CN212726525U CN212726525U CN202021663784.3U CN202021663784U CN212726525U CN 212726525 U CN212726525 U CN 212726525U CN 202021663784 U CN202021663784 U CN 202021663784U CN 212726525 U CN212726525 U CN 212726525U
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Abstract
The utility model discloses an automobile diagnostic instrument with charging function, which comprises a microcontroller MCU main control circuit, a DCDC power circuit, a control charging and overvoltage protection circuit and a charging circuit; DP and DM signal ports of the MCU master control circuit of the microcontroller are connected to DP and DM ports of a J1 interface, and a J1 interface is connected with a tablet or a mobile phone through a USB cable; an MCUEN port of the microcontroller MCU main control circuit is connected to an MCUEN port of the control charging and overvoltage protection circuit; the VCCIN port of the DCDC power supply circuit is connected to the VCCIN port of the control charging and overvoltage protection circuit; the OUT port of the charging and overvoltage protection circuit is controlled to be connected to the OUT port of the charging circuit; the BAT port of the charging circuit is connected with the BAT port of the J1 interface. In the diagnosis process, when the electric quantity of the tablet or the mobile phone is insufficient and the USB interface is occupied, the diagnosis instrument can charge the tablet or the mobile phone at the same time, detection and maintenance are not interrupted, maintenance efficiency is improved, and convenience is brought to diagnosis and maintenance of automobile faults.
Description
Technical Field
The utility model belongs to the technical field of the electronic technology and specifically relates to an automotive diagnostic instrument with function of charging is related to.
Background
The initial automobile diagnostic instrument is a handset integrating common LED characters or a dot-matrix display screen and mechanical keys, and the characters or the dot-matrix interface ensures that the display interface is single, the displayed information amount is less and the operation is complicated. Along with the development of electronic technology, automobile diagnosis technology has also obtained unprecedented development, the quick MCU electronic chip of high integration that possesses large capacity storage and multiple bus technique uses widely in automobile diagnosis instrument, make automobile diagnosis convenient more nimble, many graphical user interface and the touch-sensitive screen that adopt android operating system to develop have brought better operation experience for the user, adopt a cell-phone or dull and stereotyped interface such as through bluetooth or USB to carry out interactive operation's a novel automobile diagnosis appearance by wide use with automobile diagnosis appearance.
In actual use, the mobile phone or the flat panel is often used up in the field diagnosis and maintenance, and the mobile phone or the flat panel is inconvenient to charge in the field of maintenance, so that certain influence is caused on the field maintenance of the automobile.
For high efficiency's detection and maintenance automobile fault and state, reduce the influence that cell-phone or dull and stereotyped shutdown brought for auto repair, the automobile diagnosis appearance that urgently needs to develop one kind to have the function of charging on the market, the utility model discloses also design and development based on this reason.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide an automotive diagnostic instrument with function of charging, make vehicle maintenance personnel can not receive the influence that cell-phone or dull and stereotyped power supply are not enough, detection vehicle fault situation that can be timely convenient.
In order to solve the technical problem, the utility model relates to an automobile diagnostic device with charging function, which comprises a microcontroller MCU main control circuit, wherein DP and DM signal ports of the microcontroller MCU main control circuit are connected to DP and DM ports of an J1 interface of the automobile diagnostic device; the J1 interface is a USB interface and is used for transmitting diagnosis commands and exchanging diagnosis data by connecting a USB cable with a tablet or a mobile phone; the DC/DC power supply circuit is characterized by also comprising a DCDC power supply circuit, a control charging and overvoltage protection circuit and a charging circuit; an MCUEN port of the microcontroller MCU main control circuit is connected to an MCUEN port of the control charging and overvoltage protection circuit to control the charging to be started or closed; the VCCIN port of the DCDC power supply circuit is connected to the VCCIN port of the control charging and overvoltage protection circuit; the OUT port of the control charging and overvoltage protection circuit is connected to the OUT port of the charging circuit; and the BAT port of the charging circuit is connected with the BAT port of the J1 interface.
As a further improvement of the utility model, the control charging and overvoltage protection circuit comprises an input voltage filter circuit, an overvoltage detection circuit, a control charging circuit and a charging voltage output circuit which are connected in sequence; the input voltage filter circuit is connected with the DCDC power supply circuit; and the charging voltage output circuit is connected with the charging circuit.
Further, the input voltage filter circuit is composed of a first capacitor C1 and a second capacitor C2; one ends of the first capacitor C1 and the second capacitor C2 are connected in parallel and then connected to the VCCIN port, and the other ends of the first capacitor C1 and the second capacitor C2 are connected in parallel and then connected to the ground end GND.
Further, the overvoltage detection circuit is composed of a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first diode D1, a first triode Q1 and a second MOS transistor Q2; the first resistor R1 and the second resistor R2 are current-limiting resistors, and the third resistor R3 and the fourth resistor R4 are voltage-dividing resistors; one ends of a first resistor R1 and a third resistor R3 are connected with the emitter of the first triode Q1 and the source of the second MOS transistor Q2 in parallel and are connected to a VCCIN port; one ends of the first resistor R1, the second resistor R2 and the first diode D1 are connected in parallel, and the other end of the first diode D1 is connected with one end of the fourth resistor R4 in parallel and then connected to the ground end GND; the collector of the first triode Q1 is connected in parallel with the other ends of the third resistor R3, the fourth resistor R4 and the gate of the second MOS transistor Q2.
Furthermore, the charging control circuit is composed of a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a third MOS transistor Q3, and a fourth triode Q4; the fifth resistor R5 and the eighth resistor R8 are voltage dividing resistors, and the sixth resistor R6 is a current limiting resistor; one end of a fifth resistor R5 is connected with the source electrode of the third MOS tube Q3 in parallel and then is connected with the overvoltage detection circuit; the other end of the fifth resistor R5 is connected with one end of the eighth resistor R8 and the gate of the third MOS transistor Q3 in parallel; the other end of the eighth resistor R8 is connected with the collector of the fourth triode Q4, and one end of the sixth resistor R6 is connected to the MCUEN port of the microcontroller MCU main control circuit to control the charging to be started or closed; the other end of the sixth resistor R6 is connected in parallel with one end of the seventh resistor R7 and the base of the fourth transistor Q4, and the other end of the seventh resistor R7 is connected in parallel with the emitter of the fourth transistor Q4 and then connected to the ground GND.
Further, the charging voltage output circuit is composed of a second diode D2, a ninth resistor R9, a third diode D3 and a first self-recovery F1; the second diode D2 is a TVS diode, and the third diode D3 is a light emitting diode; the cathode of the second diode D2, one end of the 9 th resistor R9 and one end of the first self-recovery F1 are connected in parallel to the control charging circuit, the anode of the second diode D2 is connected to the ground GND, the other end of the ninth resistor R9 is connected to the anode of the third diode D3, and the cathode of the third diode D3 is connected to the ground GND; the other end of the first self-healing F1 is connected as an output to the OUT port.
Further, the charging circuit is composed of a fourth diode D4, a fifth diode D5, a third capacitor C3, a first integrated circuit U1, a tenth resistor R10, a fourth capacitor C4, and a sixth diode D6; the fourth diode D4 and the fifth diode D5 are light emitting diodes, the first integrated circuit U1 is a charging main chip, the charging state is determined by detecting the voltage state of the battery, the tenth resistor R10 is a charging current setting resistor, and the sixth diode D6 is a schottky diode; one end of the third capacitor C3, the anode of the fourth diode D4, the anode of the fifth diode D5 and the 4 th pin VIN of the first integrated circuit U1 are connected in parallel and then connected to the OUT port; the other end of the third capacitor C3 is grounded to the GND; the cathode of the fourth diode D4 is connected to the 6 th pin STAT2 of the first integrated circuit U1, and the cathode of the fifth diode D5 is connected to the 7 th pin STAT1 of the first integrated circuit; the 3 rd pin GND and the 9 th pin GND of the first integrated circuit are connected to a ground end GND; the 2 nd pin ISET of the first integrated circuit U1 is connected in parallel with one end of a tenth resistor R10; the other end of the tenth resistor R10 is connected in parallel with one end of the 4 th capacitor C4 and then connected to the ground GND; the 5 th pin BAT of the first integrated circuit U1 is connected in parallel with the anode of the sixth diode D6 and the other end of the fourth capacitor C4; the other end of the sixth diode D6 is connected to the BAT port of the J1 interface.
Further, the model of the first integrated circuit U1 is HX 4056.
Further, the VCCIN port, the OUT port, and the BAT port are all 5V ports.
The utility model discloses set up DCDC power supply circuit in auto diagnosis appearance, control is charged and overvoltage crowbar and charging circuit, dull and stereotyped or cell-phone pass through the USB cable and link to each other with the J1 interface (USB interface) of auto diagnosis appearance, microcontroller MCU main control circuit passes through the control of MCUEN port and DCDC power supply circuit provides the charging voltage through the VCCIN end, when host computer flat board or cell-phone in normal diagnosis use, the electric quantity appears not enough and under the occupied condition of USB interface, the charge mode can be opened simultaneously to the diagnosis appearance, uninterrupted testing maintenance, guarantee the continuity of maintenance, guarantee the normal use of vehicle inspection maintenance, maintenance efficiency is improved, it is convenient to provide with the maintenance for the diagnosis of automobile fault.
Drawings
The foregoing is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clear, the present invention will be further described in detail with reference to the accompanying drawings and the detailed description.
Fig. 1 is a schematic circuit diagram of an automotive diagnostic apparatus with a charging function according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a charging control and overvoltage protection circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a charging circuit according to an embodiment of the present invention.
As shown, specific structures and devices are labeled in the figures to clarify the structure of the embodiments of the invention, but this is only for illustrative purposes and is not intended to limit the invention to this specific structure, device and environment. Those of ordinary skill in the art may adapt or modify the devices and environments according to particular needs and such adaptations or modifications are intended to be included within the scope of the appended claims.
Detailed Description
The following describes the car diagnostic apparatus with charging function in detail with reference to the accompanying drawings and specific embodiments.
It is to be noted, however, that the following embodiments are preferred and preferred embodiments for making the embodiments more detailed, and that other alternatives may be implemented by those skilled in the art; also, the accompanying drawings are included to describe embodiments in greater detail and are not intended to limit the invention in any way.
As shown in fig. 1, the present embodiment provides an automobile diagnostic apparatus with a charging function, which includes a microcontroller MCU main control circuit, a DCDC power circuit, a charging control and overvoltage protection circuit, and a charging circuit, wherein:
DP and DM signal ports of the MCU main control circuit are connected to DP and DM ports of a J1 interface (USB interface) of the automobile diagnostic instrument and are responsible for processing diagnostic disconnection commands and diagnostic data transceiving through the DP and DM signal ports; and an MCUEN port of the microcontroller MCU main control circuit is connected to an MCUEN port of the control charging and overvoltage protection circuit, and the charging state is controlled by controlling the charging to be started or closed.
The VCC5VIN port of the DCDC power supply circuit is connected to the VCC5VIN port of the control charging and overvoltage protection circuit, the DCDC power supply circuit adopts a voltage reduction type direct current-to-direct current circuit, and 12V-24V input to the diagnostic instrument can be converted into direct current 5V voltage to be output to the VCC5VIN port to be connected with the VCC5VIN port of the control charging and overvoltage protection circuit. The DCDC power supply circuit also provides power output for the whole automobile diagnostic instrument to ensure the normal operation of the diagnostic instrument.
The control charging and overvoltage protection circuit prevents the voltage from exceeding the allowable range of 5.1V by detecting the charging voltage input from the VCC5VIN port, and the 5VOUT port of the control charging and overvoltage protection circuit is connected to the 5VOUT port of the charging circuit.
And the BAT5V port of the charging circuit is connected with the BAT5V port of the J1 interface and is used for connecting a charging power supply. The charging circuit is responsible for the completion of the charging process. The J1 interface is connected with a tablet personal computer or a mobile phone through a USB cable to transmit diagnosis commands and exchange diagnosis data; the charging voltage is also connected to the upper computer panel or the mobile phone through the J1 interface, so that the data interaction and charging functions between the diagnostic apparatus and the panel or the mobile phone are realized.
Specifically, in one embodiment, as shown in fig. 2, the charging control and overvoltage protection circuit includes an input voltage filter circuit, an overvoltage detection circuit, a charging control circuit, and a charging voltage output circuit, which are connected in sequence; the input voltage filter circuit is connected with the DCDC power supply circuit; the charging voltage output circuit is connected with the charging circuit.
In one embodiment, the input voltage filter circuit is shown in fig. 2 and comprises a first capacitor C1 and a second capacitor C2; one ends of the first capacitor C1 and the second capacitor C2 are connected in parallel and then connected to the VCC5VIN port, and the other ends of the first capacitor C1 and the second capacitor C2 are connected in parallel and then connected to the ground GND. The circuit filters 5V voltage of an input power supply, and filters power supply clutter interference.
In one embodiment, the overvoltage detection circuit is shown in fig. 2 and comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first diode D1, a first triode Q1 and a second MOS transistor Q2; one ends of the first resistor R1 and the third resistor R3 are connected with the emitter of the first triode Q1 and the source of the second MOS transistor Q2 in parallel and are connected to a VCC5VIN port; one ends of the first resistor R1, the second resistor R2 and the first diode D1 are connected in parallel, and the other end of the first diode D1 is connected with one end of the fourth resistor R4 in parallel and then connected to the ground end GND; the collector of the first triode Q1 is connected in parallel with the other ends of the third resistor R3, the fourth resistor R4 and the gate of the second MOS transistor Q2. The first resistor R1, the third resistor R3 and the fourth resistor R4 are all precision resistors; the first resistor R1 and the second resistor R2 are current limiting resistors, and the third resistor R3 and the fourth resistor R4 are voltage dividing resistors, and are used for enabling the MOS transistor to be normally conducted.
The working process of the overvoltage detection circuit is as follows: the filtered voltage is limited by a first resistor R1 and then is connected to a first diode D1 for voltage stabilization, preferably the first diode D1 is selected to be stabilized at 5.1V, and the preferred model of the embodiment is ZSMA5.1V. When the input 5V voltage is detected to exceed 5.1V, the transistor is conducted, and the triode controlled by the voltage stabilizing diode is conducted, so that the MOS transistor connected in series in the 5V power supply loop is cut off, and a subsequent load circuit is prevented from being burnt out. Specifically, the method comprises the following steps:
when the input voltage value of the VCC5VIN port is 5V, the first diode D1 is in an off state, so that the voltage difference between the emitter and the base of the first triode Q1 is 0V, the first triode Q1 is in an off state, at this time, the gate voltage of the second MOS transistor Q2 is determined by the divided voltage values of the third resistor R3 and the fourth resistor R4, the values of the third resistor R3 and the fourth resistor R4 make the voltage difference between the source and the gate of the second MOS transistor Q2 reach-4V or more, at this time, the second MOS transistor Q2 is in an on state, and the input voltage VCC5 is normally supplied to the subsequent stage VIN.
When the input voltage VCC5VIN exceeds 5.1V, the first diode D1 starts to conduct, so that the cathode voltage of the first diode D1 is maintained at 5.1V, and as the VCC5VIN input voltage continuously rises, the voltage difference between the two ends of the first resistor R1 reaches about 0.9V, that is, the voltage value of the VCC5VIN rises to about 6V, so that the voltage difference between the CE electrodes of the first triode Q1 reaches-0.9V, the first triode Q1 is conducted, the voltage value of the VCC5VIN is directly added to the gate of the second MOS transistor Q2, so that the voltage difference between the gate and the source of the second MOS transistor Q2 is 0V, and the second MOS transistor Q2 is in a turn-off state, thereby preventing the input voltage VCC5 from being supplied to a rear-stage circuit and achieving the purpose of protecting the rear-stage circuit.
In one embodiment, the charging control circuit is shown in fig. 2 and comprises a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a third MOS transistor Q3, and a fourth transistor Q4; one end of a fifth resistor R5 is connected with the source electrode of the third MOS tube Q3 in parallel and then is connected with the overvoltage detection circuit; the other end of the fifth resistor R5 is connected with one end of the eighth resistor R8 and the gate of the third MOS transistor Q3 in parallel; the other end of the eighth resistor R8 is connected with the collector of the fourth triode Q4, and one end of the sixth resistor R6 is connected to the MCUEN port of the microcontroller MCU main control circuit to control the charging to be started or closed; the other end of the sixth resistor R6 is connected in parallel with one end of the seventh resistor R7 and the base of the fourth transistor Q4, and the other end of the seventh resistor R7 is connected in parallel with the emitter of the fourth transistor Q4 and then connected to the ground GND. The fifth resistor R5, the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 are precision resistors; the sixth resistor R6 plays a role in limiting the base current of the fourth transistor Q4, and the seventh resistor R7 plays a role in reliably turning off the base potential of the fourth transistor Q4 at 0V in the off state; the fifth resistor R5 and the eighth resistor R8 are voltage dividing resistors, so that the voltage difference between the gate and the source of the third MOS transistor Q3 is greater than-4V.
The working process of the charging control circuit is as follows: when the panel or the mobile phone needs to be charged, the upper computer sends a charging permission control command, so that the microcontroller controls the MCU circuit to output a control signal to the MCUEN end, the controlled triode is conducted, the MOS switching tube connected in series in the power supply loop is conducted, the purpose of controlling charging is achieved, and otherwise, charging is closed. The method specifically comprises the following steps:
when the MCUEN port of the MCU main control circuit is at a low level, the base voltage of the fourth transistor Q4 is also 0V through the sixth resistor R6, at this time, the fourth transistor Q4 is in an off state, so that the voltage dividing circuit formed by the fifth resistor R5 and the eighth resistor R8 is in an off state, at this time, the gate and the source of the third MOS transistor Q3 maintain the same potential, the voltage difference between the gate and the source is 0V, and the third MOS transistor Q3 is in an off state, and the connection with the charging circuit at the subsequent stage is disconnected, thereby playing a charging off state.
When the MCUEN port of the MCU master control circuit is at a high level, the voltage value of the base of the fourth transistor Q4 reaches about 0.7V through the sixth resistor R6, at this time, the fourth transistor Q4 is in a conducting state, one end of the eighth resistor R8 is connected to the ground GND, the voltage difference between the source and the gate of the MOS transistor reaches above-4V through the voltage dividing circuit formed by the fifth resistor R5 and the eighth resistor R8, the third MOS transistor Q3 is in a conducting state, and at this time, the charging state is turned on effectively.
In one embodiment, the charging voltage output circuit is shown in fig. 2 and comprises a second diode D2, a ninth resistor R9, a third diode D3 and a first self-recovery F1; the cathode of the second diode D2, one end of the 9 th resistor R9 and one end of the first self-recovery F1 are connected in parallel to the control charging circuit, the anode of the second diode D2 is connected to the ground GND, the other end of the ninth resistor R9 is connected to the anode of the third diode D3, and the cathode of the third diode D3 is connected to the ground GND; the other end of the first self-healing F1 is connected as an output to the 5VOUT port. The second diode D2 is a TVS diode, which has an anti-transient electrostatic interference effect and protects the third MOS transistor Q3 from transient electrostatic breakdown, the drain voltage of the third MOS transistor Q3 is 5V, and the preferred type of the second diode D2 is SMA6.8CA. The third diode D3 is a light emitting diode, the third diode D3 and the ninth resistor R9 form a charging status indicating circuit, and the third diode D3 is turned on when charging is started. The first self-recovery F1 plays an overcurrent protection role for preventing the short circuit of the subsequent stage. The charging current of the present example is 1A at most, so the preferred model F1 is SMD1206P 150/24V.
In one embodiment, the charging circuit is composed of a fourth diode D4, a fifth diode D5, a third capacitor C3, a first integrated circuit U1, a tenth resistor R10, a fourth capacitor C4, and a sixth diode D6, as shown in fig. 3; one end of the third capacitor C3, the anode of the fourth diode D4, the anode of the fifth diode D5 and the 4 th pin VIN of the first integrated circuit U1 are connected in parallel and then connected to the OUT port; the other end of the third capacitor C3 is grounded to the GND; the cathode of the fourth diode D4 is connected to the 6 th pin STAT2 of the first integrated circuit U1, and the cathode of the fifth diode D5 is connected to the 7 th pin STAT1 of the first integrated circuit; the 3 rd pin GND and the 9 th pin GND of the first integrated circuit are connected to a ground end GND; the 2 nd pin ISET of the first integrated circuit U1 is connected in parallel with one end of a tenth resistor R10; the other end of the tenth resistor R10 is connected in parallel with one end of the 4 th capacitor C4 and then connected to the ground GND; the 5 th pin BAT of the first integrated circuit U1 is connected in parallel with the anode of the sixth diode D6 and the other end of the fourth capacitor C4; the other end of the sixth diode D6 is connected to the BAT port of the J1 interface.
The fourth diode D4 and the fifth diode D5 are light emitting diodes, and the sixth diode D6 is a schottky diode; the tenth resistor R10 is a charging current setting resistor, preferably a precision resistor, the charging current being determined according to IBAT 1000/RISET, and in this embodiment preferably a resistance of 1K with a precision of 1%. The first integrated circuit U1 is a main charging chip, preferably model HX4056, and determines the charging status by detecting the battery voltage status, for example, when the tablet & cell phone voltage is lower than the pre-charging voltage, the chip automatically performs the trickle mode pre-charging, when the tablet & cell phone voltage is higher than the pre-charging voltage and lower than the constant current mode charging voltage, the chip starts the constant current charging to the tablet & cell phone, and the charging current is externally adjustable. When the voltage of the mobile phone rises to the constant-voltage charging mode, the chip automatically enters the constant-voltage charging mode, and when the charging current is smaller than the full charging current, the charging is finished.
The specific working process of the charging circuit is as follows:
when the voltage of the tablet or the mobile phone is lower than 4.05V, and the voltage of the port 5VOUT is greater than the voltage detection threshold set by the chip by 2.9V, HX4056 starts to charge the tablet or the mobile phone with a small current, namely trickle current, so that the fifth diode D5 is lighted, and the fourth diode D4 is not lighted, thereby indicating that the tablet or the mobile phone is in a charging state. When the charging voltage reaches 2.9V, HX4056 charges at a current set by IBAT 1000/RISET, which is 1A in this embodiment, and the charging mode is changed to constant current mode. When the charging voltage reaches 4.2V, HX4056 charges in a constant voltage manner, the charging current gradually decreases, and when the charging current decreases to 1/10, i.e., 0.1A, the charging is finished, the fourth diode D4 lights up, the fifth diode D5 does not light up, indicating that the charging is finished. When HX4056 detects that the tablet or handset voltage is below 4.05V, the next charging cycle is started again.
To sum up, the utility model discloses the auto diagnosis when mainly used passes through dull and stereotyped or cell-phone as the host computer detects, it has the function automobile diagnosis appearance that charges to propose one kind, can open or close the function of charging according to cell-phone or dull and stereotyped electric quantity in auto diagnosis maintenance process, the diagnostic instrument can on-the-spot cell-phone or dull and stereotyped charging, make vehicle maintenance personnel not receive the influence of cell-phone or dull and stereotyped power supply, guarantee the continuity of maintenance, timely convenient detection vehicle fault situation, the very big maintenance that has made things convenient for, maintenance efficiency is improved, this diagnosis and maintenance for automobile fault provide convenience, one of a large amount of vapour repairment personnel's necessary instrument.
Of course, various other embodiments of the present invention can be devised by those skilled in the art without departing from the spirit and scope of the present invention, and it should be understood that various changes can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (9)
1. A car diagnostic apparatus with charging function, including MCU master control circuit of the microcontroller, DP, DM signal port of the said microcontroller MCU master control circuit is connected to DP, DM port of the J1 interface of car diagnostic apparatus; the J1 interface is a USB interface and is used for transmitting diagnosis commands and exchanging diagnosis data by connecting a USB cable with a tablet or a mobile phone; the DC/DC power supply circuit is characterized by also comprising a DCDC power supply circuit, a control charging and overvoltage protection circuit and a charging circuit;
an MCUEN port of the microcontroller MCU main control circuit is connected to an MCUEN port of the control charging and overvoltage protection circuit to control the charging to be started or closed;
the VCCIN port of the DCDC power supply circuit is connected to the VCCIN port of the control charging and overvoltage protection circuit;
the OUT port of the control charging and overvoltage protection circuit is connected to the OUT port of the charging circuit; and the BAT port of the charging circuit is connected with the BAT port of the J1 interface.
2. The automobile diagnostic instrument with charging function of claim 1, wherein the charging control and overvoltage protection circuit comprises an input voltage filter circuit, an overvoltage detection circuit, a charging control circuit and a charging voltage output circuit which are connected in sequence;
the input voltage filter circuit is connected with the DCDC power supply circuit; and the charging voltage output circuit is connected with the charging circuit.
3. The automobile diagnostic instrument with charging function as claimed in claim 2, wherein the input voltage filter circuit is composed of a first capacitor C1 and a second capacitor C2;
one ends of the first capacitor C1 and the second capacitor C2 are connected in parallel and then connected to the VCCIN port, and the other ends of the first capacitor C1 and the second capacitor C2 are connected in parallel and then connected to the ground end GND.
4. The automobile diagnostic instrument with the charging function according to claim 2, wherein the overvoltage detection circuit is composed of a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first diode D1, a first triode Q1 and a second MOS transistor Q2; the first resistor R1 and the second resistor R2 are current-limiting resistors, the third resistor R3 and the fourth resistor R4 are voltage-dividing resistors, and the first diode D1 is a voltage-stabilizing diode;
one ends of a first resistor R1 and a third resistor R3 are connected with the emitter of the first triode Q1 and the source of the second MOS transistor Q2 in parallel and are connected to a VCCIN port; one ends of the first resistor R1, the second resistor R2 and the first diode D1 are connected in parallel, and the other end of the first diode D1 is connected with one end of the fourth resistor R4 in parallel and then connected to the ground end GND; the collector of the first triode Q1 is connected in parallel with the other ends of the third resistor R3, the fourth resistor R4 and the gate of the second MOS transistor Q2.
5. The automobile diagnostic instrument with charging function of claim 2, wherein the control charging circuit is composed of a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a third MOS transistor Q3 and a fourth triode Q4; the fifth resistor R5 and the eighth resistor R8 are voltage dividing resistors, and the sixth resistor R6 is a current limiting resistor;
one end of a fifth resistor R5 is connected with the source electrode of the third MOS tube Q3 in parallel and then is connected with the overvoltage detection circuit; the other end of the fifth resistor R5 is connected with one end of the eighth resistor R8 and the gate of the third MOS transistor Q3 in parallel; the other end of the eighth resistor R8 is connected with the collector of the fourth triode Q4, and one end of the sixth resistor R6 is connected to the MCUEN port of the microcontroller MCU main control circuit to control the charging to be started or closed; the other end of the sixth resistor R6 is connected in parallel with one end of the seventh resistor R7 and the base of the fourth transistor Q4, and the other end of the seventh resistor R7 is connected in parallel with the emitter of the fourth transistor Q4 and then connected to the ground GND.
6. The automobile diagnostic instrument with charging function as claimed in claim 2, wherein the charging voltage output circuit is composed of a second diode D2, a ninth resistor R9, a third diode D3, and a first self-recovery F1; the second diode D2 is a TVS diode, and the third diode D3 is a light emitting diode;
the cathode of the second diode D2, one end of the 9 th resistor R9 and one end of the first self-recovery F1 are connected in parallel to the control charging circuit, the anode of the second diode D2 is connected to the ground GND, the other end of the ninth resistor R9 is connected to the anode of the third diode D3, and the cathode of the third diode D3 is connected to the ground GND; the other end of the first self-healing F1 is connected as an output to the OUT port.
7. The automobile diagnostic instrument with charging function of any one of claims 1 to 6, wherein the charging circuit is composed of a fourth diode D4, a fifth diode D5, a third capacitor C3, a first integrated circuit U1, a tenth resistor R10, a fourth capacitor C4 and a sixth diode D6; the fourth diode D4 and the fifth diode D5 are light emitting diodes, the first integrated circuit U1 is a charging main chip, the charging state is determined by detecting the voltage state of the battery, the tenth resistor R10 is a charging current setting resistor, and the sixth diode D6 is a schottky diode;
one end of the third capacitor C3, the anode of the fourth diode D4, the anode of the fifth diode D5 and the 4 th pin VIN of the first integrated circuit U1 are connected in parallel and then connected to the OUT port; the other end of the third capacitor C3 is grounded to the GND;
the cathode of the fourth diode D4 is connected to the 6 th pin STAT2 of the first integrated circuit U1, and the cathode of the fifth diode D5 is connected to the 7 th pin STAT1 of the first integrated circuit;
the 3 rd pin GND and the 9 th pin GND of the first integrated circuit are connected to a ground end GND;
the 2 nd pin ISET of the first integrated circuit U1 is connected in parallel with one end of a tenth resistor R10; the other end of the tenth resistor R10 is connected in parallel with one end of the 4 th capacitor C4 and then connected to the ground GND; the 5 th pin BAT of the first integrated circuit U1 is connected in parallel with the anode of the sixth diode D6 and the other end of the fourth capacitor C4; the other end of the sixth diode D6 is connected to the BAT port of the J1 interface.
8. The automobile diagnostic instrument with charging function according to claim 7, wherein the first integrated circuit U1 has model number HX 4056.
9. The apparatus of claim 1, wherein the VCCIN port, the OUT port and the BAT port are all 5V ports.
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| CN202021663784.3U CN212726525U (en) | 2020-08-12 | 2020-08-12 | Automobile diagnostic instrument with charging function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113054723A (en) * | 2021-04-30 | 2021-06-29 | 上海器外文化科技有限公司 | Electric screwdriver and charging circuit thereof |
| CN114447880A (en) * | 2022-01-12 | 2022-05-06 | 中汽创智科技有限公司 | Load overcurrent and overvoltage protection circuit and vehicle power supply system |
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2020
- 2020-08-12 CN CN202021663784.3U patent/CN212726525U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113054723A (en) * | 2021-04-30 | 2021-06-29 | 上海器外文化科技有限公司 | Electric screwdriver and charging circuit thereof |
| CN114447880A (en) * | 2022-01-12 | 2022-05-06 | 中汽创智科技有限公司 | Load overcurrent and overvoltage protection circuit and vehicle power supply system |
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