Current position detection circuit of automobile central armrest box

Abstract

A current position detection circuit of an automobile central armrest box is characterized in that n monitors U6 are arranged, and the monitoring end of each monitor U6 is connected with a current detection circuit and a position detection circuit through a change-over switch K1; the front end of a resistor R1 in the current detection circuit obtains a detection instruction, the rear end of the resistor R1 is connected with a base electrode of a triode Q1, an emitter electrode of the Q1 is connected with a resistor R4 in series and then is grounded, a collector electrode of the Q1 is connected with a negative input end of a solid-state relay U4, a positive input end of the U4 is connected with a 5V power supply, a positive output end of the U4 is connected with a positive power supply through a gear-shifting combined resistor, and a negative output end of the U4 is connected with a self-recovery fuse F1 and then is connected with the front end of a resistor R19. The rear end of the R19 is connected with a load; the positive input end of the current sensing amplifier U7 is connected with the front end of the R19, the negative input end of the current sensing amplifier U7 is connected with the rear end of the R19, the output end of the current sensing amplifier U7 is connected with the first input end of the change-over switch K1, and the output end of the change-over switch K1 and the monitoring end of the U6 are connected. The beneficial effects are that the current detection of each part is realized by using a parallel detection mode, the product detection time is shortened, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic detection, in particular to a current position detection circuit for a central armrest box of an automobile. Background Art

[0002] In the past, the center armrest box wiring harness was inspected after installation using a multimeter and relays to measure the resistance of each component after installation to confirm whether the wiring harness and components were properly connected.

[0003] But it has many disadvantages:

[0004] 1) The continuity test requires the use of a multimeter through relay switching. The multimeter has a slow response and can only complete one test before testing the next one, which will cause the overall test time to be long and have an adverse impact on production.

[0005] 2) The internal resistance values ​​of components in different batches are different, and the resistance value detection method may mistakenly judge qualified products as defective products;

[0006] 3) The switching relay has a limited service life and will fail if used for a long time.

[0007] The above-mentioned detection methods cannot meet the actual needs of production testing, and thus it is difficult to ensure the product qualification rate. Utility Model Content

[0008] The utility model provides a current position detection circuit for a central armrest box of an automobile, which can improve detection efficiency and shorten detection time.

[0009] To achieve the above-mentioned object, the present invention provides a current position detection circuit for a central armrest box of an automobile, the key of which is: n monitors U6 are provided, and the monitoring end of each monitor U6 is connected to a current detection circuit and a position detection circuit via a switching switch K1;

[0010] The current detection circuit is provided with a resistor R1, the front end of the resistor R1 is used to obtain a detection instruction, the rear end of the resistor R1 is connected to the base of an NPN-type transistor Q1, the emitter of the transistor Q1 is connected in series with a resistor R4 and then grounded, the collector is connected to the negative input terminal of the solid-state relay U4, the positive input terminal of the solid-state relay U4 is connected to a 5V power supply, the positive output terminal of the solid-state relay U4 is connected to the positive power supply via a shift combination resistor, the negative output terminal of the solid-state relay U4 is connected in series with a self-resettable fuse F1 and then connected to the front end of a sampling resistor R19, and the rear end of the sampling resistor R19 is connected to a load;

[0011] The negative output terminal of the solid-state relay U4 is also connected in series with a capacitor C4 and then connected to the reset terminal of the current sensing amplifier U7;

[0012] The positive input terminal of the current sensing amplifier U7 is connected to the front end of the sampling resistor R19, the negative input terminal of the current sensing amplifier U7 is connected to the rear end of the sampling resistor R19, the output terminal of the current sensing amplifier U7 is connected to the first input terminal of the switching switch K1, and the output terminal of the switching switch K1 is the monitoring terminal of the monitor U6.

[0013] Through the above design, the original serial detection method is changed to parallel detection. Adding detection items will not increase the overall detection time, shortening the product detection time by more than half, and improving production efficiency. At the same time, a position sensor detection channel is added, eliminating the need for additional acquisition modules, achieving higher integration and reducing detection costs. The current detection circuit and the position detection circuit share the same monitor, reducing the cost of using the monitor.

[0014] Replacing the relay with a less prone to damage solid-state relay increases the equipment's trouble-free operating time. The resettable fuse F1 acts as a current-limiting resistor to prevent unexpected burnout of the device under test during measurement.

[0015] The DIP switch K1 is used to switch between current detection and position detection, so that the same monitor can perform both current detection and position detection, thereby improving the utilization rate of components and reducing detection costs.

[0016] Preferably, the position detection circuit is provided with a resistor R10 and a resistor R11, the second input end of the switching switch K1 is connected to the front end of the resistor R11, the rear end of the resistor R11 is connected in series with the resistor R10 and then grounded, and the common end of the resistor R10 and the resistor R11 is connected to the position sensor.

[0017] The resistor R11 is a jumper resistor, and the resistor R10 is a current sampling resistor.

[0018] The working principle is to connect the position sensor and resistor R10 in series in a loop. When current flows through the loop, a voltage will be generated on the resistor R10. This voltage is read by the monitoring end of U6, and the upper processor can read the value through the IIC bus.

[0019] Preferably, the output end of the position sensor is further connected in series with a capacitor C3 and then grounded.

[0020] Preferably, the shift combination resistor is provided with at least two resistors, the rear ends of all the resistors are connected to the positive output end of the solid-state relay, and the front ends of all the resistors are connected to different positive power supplies via the shift switch.

[0021] The first output terminal of the solid-state relay U4 or the independent welding resistor R18 is connected to a 12V power supply, and the first output terminal of the solid-state relay U4 or the independent welding resistor R22 is connected to a 15V power supply.

[0022] Through the above design, different positive power supplies can be switched to power the load according to the different power supply requirements of the load; at the same time, by independently welding low-cost resistors to switch the power supply, the same current position detection circuit can be connected to different loads for detection, thereby reducing the cost of use.

[0023] Preferably, the negative input terminal and the positive input terminal of the solid-state relay U4 are directly reversely connected to a protection diode D1;

[0024] The positive input terminal of the solid-state relay U4 is also connected to the anode of the light-emitting diode LED1 , and the cathode string R2 of the light-emitting diode LED1 is connected to the collector of the transistor Q1 .

[0025] The light emitting diode LED1 is a conduction indicator light, which is used to detect whether the positive and negative input terminals of the solid-state relay U4 are conducting.

[0026] Preferably, all the monitors U6 are connected to the same host processor via a bus.

[0027] Preferably, the first data transceiver terminal SDA of the monitor U6 is connected to the first signal transceiver terminal of the host processor, and the first data transceiver terminal SDA is further connected in series with a resistor R25 and then connected to a power supply; the second data transceiver terminal SCL of the monitor U6 is connected to the second signal transceiver terminal of the host processor, and the second data transceiver terminal SCL is further connected in series with a resistor R26 and then connected to a power supply.

[0028] Preferably, the power supply terminal VS of the monitor U6 is connected to a power supply, and the power supply terminal VS is connected in series with a capacitor C5 and then grounded.

[0029] Preferably, the host processor is provided with a detection instruction terminal CTRL connected to the resistor R1.

[0030] The host processor is used to send detection instructions and receive detection data.

[0031] The beneficial effects of the utility model are as follows: the current detection of each component is realized by using a parallel detection method, and even if the detection items are increased, the overall detection time will not be increased, which greatly shortens the product detection time and improves production efficiency; at the same time, the position sensor detection channel is increased, and there is no need to add an additional acquisition module, which has a higher integration level and reduces the detection cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the circuit in the embodiment. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and specific examples. The following examples or drawings are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0034] like Figure 1 As shown: A current position detection circuit of a central armrest box of an automobile is provided with n monitors U6, and a monitoring end of each monitor U6 is connected to a current detection circuit and a position detection circuit via a switching switch K1;

[0035] The current detection circuit is provided with a resistor R1, the front end of the resistor R1 is used to obtain a detection instruction, the rear end of the resistor R1 is connected to the base of an NPN-type transistor Q1, the emitter of the transistor Q1 is connected in series with a resistor R4 and then grounded, the collector is connected to the negative input terminal of the solid-state relay U4, the positive input terminal of the solid-state relay U4 is connected to a 5V power supply, the positive output terminal of the solid-state relay U4 is connected to the positive power supply via a shift combination resistor, the negative output terminal of the solid-state relay U4 is connected in series with a self-resettable fuse F1 and then connected to the front end of a sampling resistor R19, and the rear end of the sampling resistor R19 is connected to a load;

[0036] The negative output terminal of the solid-state relay U4 is also connected in series with a capacitor C4 and then connected to the reset terminal of the current sensing amplifier U7;

[0037] The positive input terminal of the current sensing amplifier U7 is connected to the front end of the sampling resistor R19, the negative input terminal of the current sensing amplifier U7 is connected to the rear end of the sampling resistor R19, the output terminal of the current sensing amplifier U7 is connected to the first input terminal of the switching switch K1, and the output terminal of the switching switch K1 is the monitoring terminal of the monitor U6.

[0038] The position detection circuit is provided with a resistor R10 and a resistor R11. The second input end of the switching switch K1 is connected to the front end of the resistor R11. The rear end of the resistor R11 is connected to the resistor R10 in series and then grounded. The common end of the resistor R10 and the resistor R11 is connected to the position sensor.

[0039] The output end of the position sensor is connected in series with a capacitor C3 and then grounded.

[0040] The working principle of the current detection circuit is as follows:

[0041] Connect the positive and negative poles of the component to be tested, i.e. the load, to pins 1 and 3 of the JP13 socket. Select the voltage of the component to be measured by welding one of the resistors R18 and R22. The host processor gives a high level to the resistor R1 to turn on the transistor Q1, and then turns on the input control terminal group of the solid-state relay U4, and then drives the MOSFET of the output terminal group to turn on, so that the measured component is in normal working state. The resistor R19 is connected in series to the working circuit as a current sampling resistor. The current flowing through is converted into voltage and amplified 100 times by U7. It is collected by U6. The host processor reads the register of U6 and converts it to obtain the actual current value.

[0042] The shift combination resistor is provided with at least two resistors, the rear ends of all the resistors are connected to the positive output end of the solid-state relay, and the front ends of all the resistors are connected to different positive power supplies via the shift switch.

[0043] The first output terminal of the solid-state relay U4 or the independent welding resistor R18 is connected to a 12V power supply, and the first output terminal of the solid-state relay U4 or the independent welding resistor R22 is connected to a 15V power supply.

[0044] The negative input terminal and the positive input terminal of the solid-state relay U4 are directly reversely connected to a protection diode D1;

[0045] The positive input terminal of the solid-state relay U4 is also connected to the anode of the light-emitting diode LED1 , and the cathode string R2 of the light-emitting diode LED1 is connected to the collector of the transistor Q1 .

[0046] All the monitors U6 are connected to the same host processor via a bus.

[0047] The first data transceiver terminal SDA of the monitor U6 is connected to the first signal transceiver terminal of the host processor, and the first data transceiver terminal SDA is also connected in series with a resistor R25 and then connected to a power supply; the second data transceiver terminal SCL of the monitor U6 is connected to the second signal transceiver terminal of the host processor, and the second data transceiver terminal SCL is also connected in series with a resistor R26 and then connected to a power supply.

[0048] The power supply terminal VS of the monitor U6 is connected to a power supply, and the power supply terminal VS is connected in series with a capacitor C5 and then grounded.

[0049] The host processor is provided with a detection instruction terminal CTRL connected to the resistor R1.

[0050] The monitor U6 in this embodiment adopts the model INA226AIDGSR, the current sensing amplifier U7 adopts the model INA199A2DCKR, and the diode D1 adopts a Schottky diode.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A current position detection circuit for a central armrest box of an automobile, characterized in that: n monitors U6 are provided, and a monitoring end of each monitor U6 is connected to a current detection circuit and a position detection circuit via a switch K1; The current detection circuit is provided with a resistor R1, the front end of the resistor R1 is used to obtain a detection instruction, the rear end of the resistor R1 is connected to the base of an NPN-type transistor Q1, the emitter of the transistor Q1 is connected in series with a resistor R4 and then grounded, the collector is connected to the negative input terminal of the solid-state relay U4, the positive input terminal of the solid-state relay U4 is connected to a 5V power supply, the positive output terminal of the solid-state relay U4 is connected to the positive power supply via a shift combination resistor, the negative output terminal of the solid-state relay U4 is connected in series with a self-resettable fuse F1 and then connected to the front end of a sampling resistor R19, and the rear end of the sampling resistor R19 is connected to a load; The negative output terminal of the solid-state relay U4 is also connected in series with a capacitor C4 and then connected to the reset terminal of the current sensing amplifier U7; The positive input terminal of the current sensing amplifier U7 is connected to the front end of the sampling resistor R19, the negative input terminal of the current sensing amplifier U7 is connected to the rear end of the sampling resistor R19, the output terminal of the current sensing amplifier U7 is connected to the first input terminal of the switching switch K1, and the output terminal of the switching switch K1 is the monitoring terminal of the monitor U6.

2. The current position detection circuit for the central console box of an automobile according to claim 1, characterized in that: The position detection circuit is provided with a resistor R10 and a resistor R11. The second input end of the switching switch K1 is connected to the front end of the resistor R11. The rear end of the resistor R11 is connected to the resistor R10 in series and then grounded. The common end of the resistor R10 and the resistor R11 is connected to the position sensor.

3. The current position detection circuit for the central console box of an automobile according to claim 2, characterized in that: The output end of the position sensor is connected in series with a capacitor C3 and then grounded.

4. The current position detection circuit for the central console box of an automobile according to claim 1, characterized in that: The shift combination resistor is provided with at least two resistors, the rear ends of all the resistors are connected to the positive output end of the solid-state relay, and the front ends of all the resistors are connected to different positive power supplies via the shift switch.

5. The current position detection circuit for the central console box of an automobile according to claim 1, characterized in that: The negative input terminal and the positive input terminal of the solid-state relay U4 are directly reversely connected to a protection diode D1; The positive input terminal of the solid-state relay U4 is also connected to the anode of the light-emitting diode LED1 , and the cathode string R2 of the light-emitting diode LED1 is connected to the collector of the transistor Q1 .

6. The current position detection circuit for the central console box of an automobile according to claim 1, characterized in that: All the monitors U6 are connected to the same host processor via a bus.

7. The current position detection circuit for the central console box of an automobile according to claim 6, characterized in that: The first data transceiver terminal SDA of the monitor U6 is connected to the first signal transceiver terminal of the host processor, and the first data transceiver terminal SDA is also connected in series with a resistor R25 and then connected to a power supply; the second data transceiver terminal SCL of the monitor U6 is connected to the second signal transceiver terminal of the host processor, and the second data transceiver terminal SCL is also connected in series with a resistor R26 and then connected to a power supply.

8. The current position detection circuit for the central console box of an automobile according to claim 7, characterized in that: The power supply terminal VS of the monitor U6 is connected to a power supply, and the power supply terminal VS is connected in series with a capacitor C5 and then grounded.

9. The current position detection circuit for the central console box of an automobile according to claim 6, characterized in that: The host processor is provided with a detection instruction terminal CTRL connected to the resistor R1.

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