Gun insertion detection circuit based on direct current charging pile

Abstract

The utility model relates to the field of charging piles, in particular to a gun insertion detection circuit based on a direct-current charging pile, and the circuit comprises an input end PD1ADC which is used for receiving a signal transmitted by an electric vehicle; the input end of the isolation circuit is coupled to the input end PD1ADC, and the isolation circuit isolates signals received by the input end PD1ADC; the input end of the amplifying circuit is coupled to the output end of the isolating circuit, and the amplifying circuit amplifies the signal output by the isolating circuit and then outputs the amplified signal; the output end ADCPD1 is used for outputting the signal amplified by the amplifying circuit; the pull-up circuit is coupled between the input end PD1ADC and the input end of the isolation circuit and is used for pulling up voltage; and the pull-down circuit is coupled between the input end PD1ADC and the input end of the isolation circuit and pulls down voltage. The method has the effects of reducing the design cost and improving the adaptability.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of charging piles, in particular to a plug-in detection circuit based on a direct-current charging pile. BACKGROUND

[0002] Electric power is a kind of renewable clean energy, which has been developed and utilized by various countries. In order to reduce pollution and facilitate people's travel, electric vehicles and charging piles for charging electric vehicles have emerged as the times require. How to determine whether the connection between the charging pile and the electric vehicle is normal and safe has become a problem, and the detection standards of various countries are different, so that different circuit designs are required according to different countries and regions, which increases the design cost.

[0003] In order to meet the detection requirements of different countries and regions, the detection circuit of the control panel of the current charging pile on the market must be changed or a new detection circuit must be added, which increases the cost and occupies the PCB space, and increases the design difficulty. CONTENT OF THE INVENTION

[0004] In order to solve the problem that the charging pile is not suitable for different countries and regions, the present application provides a plug-in detection circuit based on a direct-current charging pile.

[0005] The plug-in detection circuit based on the direct-current charging pile provided by the present application adopts the following technical scheme:

[0006] A plug-in detection circuit based on a direct-current charging pile, comprising:

[0007] An input end PD1_ADC is used for receiving a signal sent by an electric vehicle;

[0008] An isolation circuit is coupled to the input end PD1_ADC, and the signal received by the input end PD1_ADC is isolated;

[0009] An amplification circuit is coupled to the output end of the isolation circuit, and the signal output by the isolation circuit is amplified and output;

[0010] An output end ADC_PD1 is used for outputting the signal amplified by the amplification circuit;

[0011] A pull-up circuit is coupled between the input end PD1_ADC and the input end of the isolation circuit, and a pull-up voltage is used;

[0012] A pull-down circuit is coupled between the input end PD1_ADC and the input end of the isolation circuit, and a pull-down voltage is used.

[0013] By adopting the technical scheme, the signal input by the electric vehicle is isolated by the isolation circuit, interference is reduced, the isolated signal is amplified by the amplification circuit, the output end ADC_PD1 outputs the amplified signal, the single-chip microcomputer is facilitated to collect the signal, and the pull-up circuit and the pull-down circuit are adapted to standards of different countries and regions.

[0014] Optionally, the pull-up circuit comprises:

[0015] The resistor R53 is connected in parallel between the output end ADC_PD1 and the power supply end +12V_1.

[0016] By adopting the technical scheme, the signal input by the electric vehicle is isolated by the isolation circuit, interference is reduced, the isolated signal is amplified by the amplification circuit, the output end ADC_PD1 outputs the amplified signal, the single-chip microcomputer is facilitated to collect the signal, and the pull-up circuit and the pull-down circuit are adapted to standards of different countries and regions.

[0017] Optionally, the pull-down circuit comprises:

[0018] The resistor R54 is connected in parallel between the output end ADC_PD1 and the ground end PE.

[0019] By adopting the technical scheme, the signal input by the electric vehicle is isolated by the isolation circuit, interference is reduced, the isolated signal is amplified by the amplification circuit, the output end ADC_PD1 outputs the amplified signal, the single-chip microcomputer is facilitated to collect the signal, and the pull-up circuit and the pull-down circuit are adapted to standards of different countries and regions.

[0020] Optionally, the resistor R53 and the resistor R54 are selectively set according to different standards.

[0021] By adopting the technical scheme, the resistor R53 and the resistor R54 can be pasted or not pasted according to requirements, without the need to redesign the circuit because of different regions, and the circuit can be adapted to standards of China, the United States, Japan and other countries, and the plug-in gun detection circuit is multiplexed in China, the United States and Japan; the circuit design can effectively save PCB space for other designs, reduce the number of components used, and save material costs.

[0022] Optionally, the input end PD1_ADC and the input end of the isolation circuit further comprise:

[0023] The resistor R57 is connected in series between the input end PD1_ADC and the input end of the isolation circuit.

[0024] The capacitor C45 is connected in parallel between the input end PD1_ADC and the ground end PE.

[0025] By adopting the technical scheme, an RC filter circuit is formed to rectify and filter the signal, reduce interference, and improve stability.

[0026] Optionally, the isolation circuit comprises:

[0027] The isolation amplifier U13 is used for isolation, the first pin VDD1 end is coupled with the power supply end +5V_1, the second pin VIN end is coupled on the input end PD1_ADC through the resistance R57, the third pin SHTDN and the fourth pin GND1 are connected in parallel on the ground end PE, the fifth pin GND2 is coupled on the ground end GND, the sixth pin VOUTN and the seventh pin VOUTP are coupled as the output end of the isolation circuit and the input end of the amplification circuit, and the eighth pin VDD2 is coupled with the power supply end +5V.

[0028] By adopting the above technical scheme,

[0029] Optionally, the isolation circuit comprises:

[0030] The capacitor C90 is connected in parallel between the first pin VDD1 end of the isolation amplifier U13 and the ground end PE;

[0031] The capacitor C232 is connected in parallel between the first pin VDD1 end of the isolation amplifier U13 and the ground end PE;

[0032] The capacitor C233 is connected in parallel between the eighth pin VDD2 end of the isolation amplifier U13 and the ground end GND;

[0033] The capacitor C234 is connected in parallel between the eighth pin VDD2 end of the isolation amplifier U13 and the ground end GND.

[0034] By adopting the above technical scheme, the input of the isolation amplifier U13 is filtered, and the stability is improved.

[0035] Optionally, the amplification circuit comprises:

[0036] The operational amplifier U14 is coupled on the seventh pin VOUTP of the isolation amplifier U13 on the same phase input end, is coupled on the sixth pin VOUTN of the isolation amplifier U13 on the opposite phase input end, is coupled on the output end ADC_PD1 for output, is coupled on the ground end GND on the second pin, and is coupled on the power supply end +5V on the fifth pin.

[0037] By adopting the above technical scheme, the isolated signal is amplified, and the acquisition of the single-chip microcomputer is facilitated.

[0038] Optionally, the isolation amplifier U13 and the operational amplifier U14 comprise:

[0039] The resistance R58 is connected in series between the same phase input end of the operational amplifier U14 and the seventh pin VOUTP of the isolation amplifier U13;

[0040] A resistor R59 is connected in series between the inverting input terminal of the operational amplifier U14 and the sixth pin VOUTN of the isolation amplifier U13.

[0041] A capacitor C235 is connected in parallel between the non-inverting input terminal of the operational amplifier U14 and the ground terminal GND.

[0042] By using the above technical solution, the signal output to the operational amplifier U14 is rectified and filtered, the stability is improved, and the interference is reduced.

[0043] Optionally, the amplification circuit further comprises:

[0044] A capacitor C296 is connected in parallel between the inverting input terminal and the output terminal of the operational amplifier U14.

[0045] A resistor R134 is connected in parallel between the inverting input terminal and the output terminal of the operational amplifier U14.

[0046] By using the above technical solution, the current between the inverting input terminal and the output terminal of the operational amplifier is rectified and filtered, and the stability is further improved.

[0047] To sum up, the present application includes at least one of the following beneficial technical effects:

[0048] 1. The multiplexing of the plug-in gun detection circuit of the three countries of China, the United States and Japan is realized.

[0049] 2. This circuit design can effectively save PCB space, leave space for other designs, reduce the number of components used, and save material costs. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 is a circuit diagram of a plug-in gun detection circuit based on a direct current charging pile in the embodiments of the present application.

[0051] Explanation of reference signs: 1, isolation circuit; 2, amplification circuit; 3, pull-up circuit; 4, pull-down circuit. DETAILED DESCRIPTION

[0052] The following will be described in detail in combination with the accompanying Figure 1 The present application will be further described in detail.

[0053] The embodiments of the present application disclose a plug-in gun detection circuit based on a direct current charging pile. Referring to Figure 1The plug-in detection circuit based on the DC charging pile includes an input end PD1_ADC, an isolation circuit 1, an amplification circuit 2, an output end ADC_PD1, a pull-up circuit 3, and a pull-down circuit 4. The input end PD1_ADC receives a signal sent by an electric vehicle to the charging pile through a CC terminal or other manners. The input end of the isolation circuit 1 receives the signal input by the input end PD1_ADC, isolates the signal, and outputs the signal to the input end of the amplification circuit 2. The amplification circuit 2 amplifies the signal and outputs the signal through the output end ADC_PD1.

[0054] Referring to Figure 1 The isolation circuit 1 includes an isolation amplifier U13. A first pin VDD1 of the isolation amplifier U13 is electrically connected to the power supply end +5V_1. A second pin VIN of the isolation amplifier U13 is electrically connected to the input end PD1_ADC. A third pin and a fourth pin GND1 of the isolation amplifier U13 are connected in parallel to the ground end PE. A fifth pin GND2 of the isolation amplifier U13 is electrically connected to the ground end GND. A sixth pin VOUTN and a seventh pin VOUTP of the isolation amplifier U13 are coupled to the input end of the amplification circuit 2 as the output end of the isolation amplifier U13. An eighth pin VDD2 of the isolation amplifier U13 is electrically connected to the power supply end +5V.

[0055] Referring to Figure 1 A resistor R57 is connected in series between the second pin VIN of the isolation amplifier U13 and the input end PD1_ADC. The pull-up circuit 3 includes a resistor R53. The pull-down circuit 4 includes a resistor R54. One end of the resistor R53 is connected in parallel between the input end PD1_ADC and the resistor R57. The other end of the resistor R53 is electrically connected to the power supply end +12V_1. A capacitor C45 and a resistor R168 are connected between the input end PD1_ADC and the isolation circuit 1. One end of the resistor R54 is connected in parallel between the input end PD1_ADC and the resistor R57. One end of the capacitor C45 is connected in parallel between the input end PD1_ADC and the resistor R57. The other end of the resistor R54 and the other end of the capacitor C45 are connected in parallel to the ground end PE. One end of the resistor R168 is connected in parallel between the resistor R57 and the second pin VIN of the isolation amplifier U13. The other end of the resistor R168 is electrically connected to the ground end PE. The resistor R53 and the resistor R54 can be pasted according to requirements. For example, in order to meet the Chinese standard, the resistor R53 can be pasted without the resistor R54 to pull up the level and keep the level at a high level. At this time, the capacitor C45 plays a filtering role. In order to meet the American and Japanese standards, the resistor R54 can be pasted without the resistor R53 to pull down the level and keep the level at a low level. Different resistance values of the resistor R54 can be replaced according to different American and Japanese standards.

[0056] Referring to Figure 1, the isolation circuit 1 further comprises a capacitor C90, a capacitor C232, a capacitor C233, and a capacitor C234. One end of the capacitor C90 is connected in parallel between the first pin VDD1 of the isolation amplifier U13 and the power supply end +5V_1, and the other end of the capacitor C90 is electrically connected to the ground end PE. One end of the capacitor C232 is connected in parallel between the first pin VDD1 of the isolation amplifier U13 and the power supply end +5V_1, and the other end of the capacitor C232 is electrically connected to the ground end PE. One end of the capacitor C233 is connected in parallel between the eighth pin VDD2 of the isolation amplifier U13 and the power supply end +5V, and the other end of the capacitor C233 is electrically connected to the ground end GND. One end of the capacitor C234 is connected in parallel between the eighth pin VDD2 of the isolation amplifier U13 and the power supply end +5V, and the other end of the capacitor C234 is electrically connected to the ground end GND. The capacitor C90, the capacitor C232, the capacitor C233, and the capacitor C234 function as filters.

[0057] With reference to Figure 1 , the operational amplifier circuit U14 comprises an operational amplifier U14, a capacitor C296, and a resistor R134. The operational amplifier U14 further comprises a resistor R58, a resistor R59, a resistor R56, and a capacitor C235 between the operational amplifier U14 and the isolation amplifier U13. The resistor R58 is connected in series between the seventh pin VOUTP of the isolation amplifier U13 and the non-inverting input terminal of the operational amplifier U14. The resistor R59 is connected in series between the sixth pin VOUTN of the isolation amplifier U13 and the inverting input terminal of the operational amplifier U14. The first pin of the operational amplifier U14 is the non-inverting input terminal, the third pin is the inverting input terminal, the fourth pin is the output terminal, the second pin is electrically connected to the ground end GND, and the fifth pin is electrically connected to the power supply end +5V. One end of the resistor R56 is connected in parallel between the resistor R58 and the non-inverting input terminal of the operational amplifier U14. One end of the capacitor C235 is connected in parallel between the resistor R58 and the non-inverting input terminal of the operational amplifier U14. The other end of the resistor R56 and the other end of the capacitor C235 are connected in parallel to the ground end GND. One end of the capacitor C296 is connected in parallel between the resistor R59 and the inverting input terminal of the operational amplifier U14. One end of the resistor R134 is connected in parallel between the resistor R59 and the inverting input terminal of the operational amplifier U14. The other end of the capacitor C296 and the other end of the resistor R134 are connected in parallel to the output terminal of the operational amplifier U14. The output terminal of the operational amplifier U14 is electrically connected to the output end ADC_PD1. The TP40 connected in parallel between the operational amplifier U14 and the output end ADC_PD1 can be used as a data acquisition point. The resistor R58, the resistor R59, the resistor R56, and the capacitor C235 function as rectification filters.

[0058] The implementation principle of the plug-in detection circuit based on the direct current charging pile according to an embodiment of the present application is as follows: the electric vehicle outputs a signal to the input end PD1_ADC of the charging pile, the signal is pulled up through the resistor R53 or pulled down through the resistor R54, and then is input to the second pin VIN end of the isolation amplifier U13 through the filtering and rectification of the capacitor C45 and the resistor R57; the isolation amplifier U13 outputs the signal after isolation from the seventh pin VOUTP; the signal is rectified and filtered through the resistor R58, the resistor R56 and the capacitor C235 to the non-inverting input end of the operational amplifier U14; the sixth pin VOUTN of the isolation amplifier U13 outputs the signal to the inverting input end of the operational amplifier U14 through the resistor R59; and finally the signal is amplified by the operational amplifier U14 and output from the output end.

[0059] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A direct current charging pile based plug-in gun detection circuit, characterized in that, The application relates to an isolation circuit for an electric vehicle, which comprises: an input terminal PD1_ADC for receiving a signal transmitted by an electric vehicle; an isolation circuit (1) coupled to the input terminal PD1_ADC for isolating the signal received by the input terminal PD1_ADC; an amplification circuit (2) coupled to the output terminal of the isolation circuit (1) for amplifying the signal output by the isolation circuit (1) and outputting the amplified signal; an output terminal ADC_PD1 for outputting the signal amplified by the amplification circuit (2); a pull-up circuit (3) coupled between the input terminal PD1_ADC and the input terminal of the isolation circuit (1) and having a pull-up voltage; a pull-down circuit (4) coupled between the input terminal PD1_ADC and the input terminal of the isolation circuit (1) and having a pull-down voltage.

2. The DC charging pile based plug-in gun detection circuit according to claim 1, characterized in that, The pull-up circuit (3) comprises: a resistor R53 connected in parallel between the output terminal ADC_PD1 and a power supply terminal +12V_1.

3. The DC charging pile based plug-in gun detection circuit according to claim 2, characterized in that, The pull-down circuit (4) comprises: a resistor R54 connected in parallel between the output terminal ADC_PD1 and a ground terminal PE.

4. The DC charging pile based plug-in gun detection circuit according to claim 3, characterized in that: The resistor R53 and the resistor R54 are set according to different standards.

5. The DC charging pile based plug-in gun detection circuit according to claim 1, characterized in that, The input terminal PD1_ADC and the input terminal of the isolation circuit (1) further comprise: a resistor R57 connected in series between the input terminal PD1_ADC and the input terminal of the isolation circuit (1); a capacitor C45 connected in parallel between the input terminal PD1_ADC and the ground terminal PE.

6. The DC charging pile based plug-in gun detection circuit according to claim 5, characterized in that, The isolation circuit (1) comprises: an isolation amplifier U13 for isolation, a first pin VDD1 coupled to a power supply terminal +5V_1, a second pin VIN coupled to the input terminal PD1_ADC through a resistor R57, a third pin SHTDN and a fourth pin GND1 connected in parallel to a ground terminal PE, a fifth pin GND2 coupled to a ground terminal GND, a sixth pin VOUTN and a seventh pin VOUTP serving as the output terminal of the isolation circuit (1) and the input terminal of the amplification circuit (2), and an eighth pin VDD2 coupled to a power supply terminal +5V.

7. The DC charging pile-based plug-in gun detection circuit according to claim 6, characterized in that, The isolation circuit (1) comprises: a capacitor C90 connected in parallel between the first pin VDD1 of the isolation amplifier U13 and the ground terminal PE; a capacitor C232 connected in parallel between the first pin VDD1 of the isolation amplifier U13 and the ground terminal PE; a capacitor C233 connected in parallel between the eighth pin VDD2 of the isolation amplifier U13 and the ground terminal GND; a capacitor C234 connected in parallel between the eighth pin VDD2 of the isolation amplifier U13 and the ground terminal GND.

8. The DC charging pile-based plug-in gun detection circuit according to claim 6, characterized in that, The amplification circuit (2) comprises: an operational amplifier U14, a same-phase input terminal coupled to the seventh pin VOUTP of the isolation amplifier U13, an inverse-phase input terminal coupled to the sixth pin VOUTN of the isolation amplifier U13, an output terminal coupled to the output terminal ADC_PD1 for output, a second pin coupled to the ground terminal GND, and a fifth pin coupled to the power supply terminal +5V.

9. The DC charging pile-based plug-in gun detection circuit according to claim 8, characterized in that, The isolation amplifier U13 and the operational amplifier U14 comprise: a resistor R58 connected in series between the non-inverting input of the operational amplifier U14 and the seventh pin VOUTP of the isolation amplifier U13; a resistor R59 connected in series between the inverting input of the operational amplifier U14 and the sixth pin VOUTN of the isolation amplifier U13; a capacitor C235 connected in parallel between the non-inverting input of the operational amplifier U14 and the ground terminal GND.

10. The DC charging pile-based plug-in gun detection circuit according to claim 8, characterized in that, The amplification circuit (2) further comprises: a capacitor C296 connected in parallel between the inverting input and the output of the operational amplifier U14; a resistor R134 connected in parallel between the inverting input and the output of the operational amplifier U14.

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