CP signal processing circuit of bidirectional on-board charger and electric vehicle including the same

Abstract

The present application proposes a CP signal processing circuit of a bidirectional on-board charger and an electric vehicle including the same, which relates to the field of power supply, and includes: a CP signal generating unit, whose input end is used to receive a CP mode control signal, whose output end is connected to a CP signal port, and which is configured to output a CP signal at the output end or make the output end present a high-impedance state according to the CP mode control signal; a CP signal detecting unit, whose input end is used to receive a CP mode control signal, whose first end is connected to the CP signal port, and whose CP signal detecting unit is configured to output a CP detection signal at its output end when the CP mode control signal is not working or working in a detection mode; wherein when the output end of the CP signal generating unit outputs a CP signal according to the CP mode control signal, the CP signal detecting unit does not work; when the output end of the CP signal generating unit presents a high-impedance state according to the CP mode control signal, the CP signal detecting unit works in a detection mode and outputs a CP detection signal at its output end.

Description

Technical Field

[0001] The present application relates to the field of power supply, and in particular to a CP signal processing circuit of a bidirectional on-board charger and an electric vehicle including the same. Background Art

[0002] With the development of science and technology and society, electric vehicles have been widely used and their share is increasing.

[0003] Current electric vehicles often include a high-voltage power battery, which is the source of electrical energy in the electric vehicle. Usually, the high-voltage power battery is charged by the on-board charger (OBC) in the electric vehicle, using a charging pile as the power supply. And the on-board charger can usually work in both directions, that is, the high-voltage power battery can also be used as a power supply to power other loads, such as charging other electric vehicles (V2V).

[0004] In specific implementation, when charging the high-voltage power battery in the electric vehicle (such as the charging pile as the power supply), after the charging gun is inserted into the charging pile, the charging pile will send a CP signal (PWM signal) to the electric vehicle. The on-board charger determines the charging status by detecting the amplitude and duty cycle of the CP signal, including whether it can be charged normally, and the upper limit of the charging power that the charging pile can provide, that is, the power output capacity of the charging pile. The electric vehicle will request charging power according to the CP signal to improve the reliability of charging.

[0005] In specific implementation, when the high-voltage power battery charges other loads through the on-board charger in the electric vehicle, the on-board charger will also send a CP signal (PWM signal) to the load. The load determines the charging status by detecting the amplitude and duty cycle of the CP signal. The specific principle is the same as when the above-mentioned charging pile is the power supply, and will not be repeated here.

[0006] That is, the CP signal is a communication signal used between the power supply and the charged device to communicate the power output capability.

[0007] For specific implementation, please refer to Figure 1 The charging system schematic diagram of the prior art is shown. The charging pile 10 sends the CP signal through the wave generating circuit 11 therein, and transmits the CP signal to the detection circuit 31 in the electric vehicle 30 through the CP signal interface in the vehicle interface 20. The detection circuit 31 is used to detect the amplitude and duty cycle of the CP signal. The electric vehicle 30 also includes a wave generating circuit 32, which is used to send the CP signal when the high-voltage power battery is the power supply, and the CP signal is still transmitted to the load through the CP signal interface in the vehicle interface 20 ( Figure 1 The load is not shown), Figure 1 The example of charging an electric car with a charging pile 10 is taken as an example.

[0008] from Figure 1 It can be seen that in the prior art, the CP signal detection port and the CP signal wave transmission port in the electric vehicle are usually the same signal port, that is, Figure 1 CP signal interface in. Figure 1 As shown, by controlling the on and off of the switch tube S22 in the detection circuit 31 to change the voltage division of the resistor R22, the resistor R33 and the resistor in the wave generating circuit 11, the amplitude and duty cycle of the PWM signal detected by the detection circuit 31 are changed to realize the detection of the CP signal. Figure 1 As shown, when the high-voltage power battery is the power supply source, since the resistors R22 and R33 are still present, the CP signal sent by the electric vehicle 30 will be affected. To avoid the influence of the resistors R22 and R33, a single-pole double-throw relay SS1 is usually provided in the electric vehicle 30. When the electric vehicle 30 receives the CP signal, the single-pole double-throw relay SS1 switches to the detection circuit 31 in the electric vehicle 30; when the electric vehicle 30 sends the CP signal, the single-pole double-throw relay SS1 switches to the wave-generating circuit 32.

[0009] Figure 1 Although the circuit shown is simple, it requires a relay. We know that relays are large and expensive, which is contrary to the development trend of power supply systems towards small size and low cost. Summary of the invention

[0010] According to one embodiment, the present application provides a CP signal processing circuit of a bidirectional on-board charger, including: a CP signal generating unit, whose input end is used to receive a CP mode control signal, whose output end is connected to a CP signal port, and is configured to output a CP signal at the output end or make the output end present a high-impedance state according to the CP mode control signal; a CP signal detecting unit, whose input end is used to receive the CP mode control signal, whose first end is connected to the CP signal port, and the CP signal detecting unit is configured to output a CP detection signal at its output end when the CP mode control signal is not working or working in a detection mode; wherein when the output end of the CP signal generating unit outputs a CP signal according to the CP mode control signal, the CP signal detecting unit does not work; when the output end of the CP signal generating unit presents a high-impedance state according to the CP mode control signal, the CP signal detecting unit works in a detection mode and outputs a CP detection signal at its output end.

[0011] Furthermore, the CP signal generating unit includes a comparator, the comparator includes an enable terminal, and the enable terminal receives an enable signal generated according to the CP mode control signal.

[0012] Furthermore, the CP signal generating unit also includes: an enable control unit, whose input end is used to receive a CP mode control signal, and whose output end is connected to the enable end, and is used to output the enable signal according to the CP mode control signal; a resistor unit, connected between the output end of the comparator and the CP signal port; wherein the comparator also includes an inverting input end for receiving a DC reference voltage, and a non-inverting input end for receiving a first PWM signal, wherein the output end of the comparator is used to output an intermediate signal.

[0013] Furthermore, the CP signal detection unit includes: a first diode, whose anode is connected to the CP signal port; a first switch resistor series unit, including a first resistor and a first switch tube connected in series between the cathode of the first diode and the ground terminal, wherein the control end of the first switch tube is used to receive a first switch control signal; a second switch resistor series unit, including a second resistor and a second switch tube connected in series between the cathode of the first diode and the ground terminal; a switch control unit, whose input end is used to receive the CP mode control signal, and whose output end is used to output a second switch control signal to control the second switch tube.

[0014] Furthermore, the enable control unit is configured and the switch control unit is configured so that: when the CP mode control signal controls the comparator to be enabled, the second switch tube is turned off to output the CP signal at the CP signal port; when the CP mode control signal controls the comparator to be disabled, the second switch tube is turned on to receive the CP signal at the CP signal port to output the CP detection signal at the cathode of the first diode.

[0015] Furthermore, the enable control unit includes a first transistor, the base of the first transistor receives the CP mode control signal through a resistor, the collector of the first transistor is connected to the enable end of the comparator through a resistor, the emitter of the first transistor is grounded, and a resistor is connected between the collector and the emitter of the first transistor; the switch control unit includes a second transistor, the base of the second transistor receives the CP mode control signal through a resistor, the collector of the second transistor is connected to the second DC voltage end through a resistor, the emitter of the second transistor is grounded, and the collector of the second transistor is connected to the control end of the second switch tube.

[0016] Furthermore, the comparator is low level enabled, the first transistor is of PNP type, and the second transistor is of NPN type.

[0017] Furthermore, the comparator is low level enabled, the first transistor is of NPN type, and the second transistor is of PNP type.

[0018] Furthermore, the comparator is high level enabled, the first transistor is of NPN type, and the second transistor is of NPN type.

[0019] Furthermore, the comparator is high level enabled, the first transistor is of PNP type, and the second transistor is of PNP type.

[0020] Furthermore, the CP signal generating unit also includes: a second diode, whose anode is connected to the output end of the comparator and whose cathode is connected to the third positive voltage end; and a third diode, whose anode is connected to the fourth negative voltage end and whose cathode is connected to the output end of the comparator.

[0021] According to one embodiment, the present application also provides an electric vehicle, comprising: a bidirectional on-board charger; a CP signal processing circuit of the above-mentioned bidirectional on-board charger; a controller, when the electric vehicle needs to charge a charged device, the controller generates a first level of the CP mode control signal, and a low-level first switch control signal, so that the CP signal processing circuit of the bidirectional on-board charger operates in a wave transmission mode, and the CP signal port outputs a CP signal to the charged device; when it is necessary to charge the high-voltage battery in the electric vehicle, the controller generates a second level of the CP mode control signal, so that the CP signal processing circuit of the bidirectional on-board charger operates in a detection mode, the CP signal port receives the CP signal, and the cathode of the first diode outputs a CP detection signal.

[0022] Furthermore, the CP signal generating unit is integrated into a controller of the electric vehicle.

[0023] The features and technical advantages of the present disclosure have been summarized quite extensively above so that the detailed description disclosed below may be better understood. Additional features and advantages of the present disclosure will be described below, which constitute the subject matter of the claims of the present disclosure. It will be appreciated by those skilled in the art that the disclosed concepts and specific embodiments may be easily used as a basis for modifying or designing other structures or processes for achieving the same purpose of the present disclosure. It will also be appreciated by those skilled in the art that such equivalent structures do not depart from the spirit and scope of the present disclosure as set forth in the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description in conjunction with the accompanying drawings, in which:

[0025] Figure 1 A schematic diagram of a charging system in the prior art is shown;

[0026] Figure 2 A schematic diagram of a CP signal processing circuit of a bidirectional on-board charger according to an embodiment of the present application is shown;

[0027] Figure 3 A schematic diagram of a CP signal processing circuit of a bidirectional on-board charger of a specific embodiment of the present application is shown;

[0028] Figure 4 A schematic diagram of a CP signal processing circuit of a bidirectional on-board charger of another specific embodiment of the present application is shown;

[0029] Figure 5 A schematic diagram of a CP signal processing circuit of a bidirectional on-board charger of another specific embodiment of the present application is shown;

[0030] Figure 6 A schematic diagram of a CP signal processing circuit of a bidirectional on-board charger of another specific embodiment of the present application is shown;

[0031] Figure 7 A schematic diagram of a CP signal processing circuit of a bidirectional on-board charger of another specific embodiment of the present application is shown;

[0032] Figure 8 A schematic diagram of an electric vehicle according to an embodiment of the present application is shown.

[0033] Corresponding numerals and symbols in the different figures generally refer to corresponding parts unless otherwise indicated.The figures are drawn to clearly illustrate the relevant aspects of the various embodiments and are not necessarily drawn to scale. DETAILED DESCRIPTION

[0034] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] In one embodiment of the present application, a CP signal processing circuit of a bidirectional vehicle charger is provided. Figure 2 The CP signal processing circuit diagram of the bidirectional on-board charger of an embodiment of the present application is shown, and the CP signal processing circuit 100 of the bidirectional on-board charger includes:

[0036] The CP signal generating unit 110 has an input terminal din for receiving a CP mode control signal CP_M_C, an output terminal dout connected to a CP signal port dm, and is configured to output a CP signal at the output terminal dout or make the output terminal dout present a high impedance state according to the CP mode control signal CP_M_C;

[0037] The CP signal detection unit 130 has an input terminal din for receiving the CP mode control signal CP_M_C, a first terminal d1 connected to the CP signal port dm, and is configured to output a CP detection signal Ps at its output terminal dout according to whether the CP mode control signal CP_M_C is not working or working in the detection mode;

[0038] When the output terminal dout of the CP signal generating unit 110 outputs a CP signal according to the CP mode control signal CP_M_C, the CP signal detecting unit 130 does not work;

[0039] When the output terminal dout of the CP signal generating unit 110 is in a high impedance state according to the CP mode control signal CP_M_C, the CP signal detecting unit 130 operates in a detection mode and outputs a CP detection signal Ps at its output terminal dout.

[0040] The CP signal port dm is used to output the CP signal outputted from the output terminal dout of the CP signal generating unit 110 to the outside, or to receive the CP signal inputted from the outside, that is, the CP signal detection port and the CP signal transmission port are the same signal port.

[0041] like Figure 2 As shown, the CP signal generating unit 110 and the CP signal detecting unit 130 are controlled simultaneously by the CP mode control signal CP_M_C, and when the CP mode control signal CP_M_C causes the output terminal dout of the CP signal generating unit 110 to output the CP signal, the CP signal detecting unit 130 does not work, that is, the CP signal detecting unit 130 does not output the CP detection signal Ps; when the CP mode control signal CP_M_C causes the output terminal dout of the CP signal generating unit 110 to present a high impedance state, the CP signal detecting unit 130 works in the detection mode and outputs the CP detection signal Ps at its output terminal dout. First, it is possible to switch between the two modes of generating the CP signal and detecting the CP signal without a relay, thereby reducing the volume of the CP signal processing circuit 100 of the bidirectional on-board charger and reducing the price, which is the same as the development trend of the power supply system. Furthermore, the CP signal generating unit 110 and the CP signal detecting unit 130 are interlocked and do not affect each other through the CP mode control signal CP_M_C, thereby improving the reliability of their respective operations.

[0042] The above-mentioned CP signal processing circuit 100 of the bidirectional on-board charger is applied to the on-board charger. When the CP signal processing circuit 100 of the bidirectional on-board charger generates a CP signal, the high-voltage power battery in the electric vehicle charges the load (such as other electric vehicles) through the on-board charger. When the CP signal processing circuit 100 of the bidirectional on-board charger detects the CP signal, the high-voltage power battery in the electric vehicle is charged. At this time, the CP signal processing circuit 100 of the bidirectional on-board charger receives the CP signal (such as the CP signal from the charging pile) and detects the CP signal to determine the charging status, including whether it can be charged normally and the upper limit of the charging power that the charging pile can provide. The electric vehicle will request the charging power according to the CP signal to improve the reliability of charging.

[0043] See also Figure 3 The CP signal processing circuit diagram of a bidirectional on-board charger of a specific embodiment of the present application is shown, the CP signal generating unit 110 includes a comparator 111, the comparator 111 includes an enable terminal SD, the enable terminal SD receives an enable signal EN generated according to the CP mode control signal CP_M_C, so that the comparator 111 can be enabled or disabled by the enable signal EN of its enable terminal SD. When the comparator 111 is not enabled, its output terminal dout presents a high impedance state, so that the output terminal dout of the CP signal generating unit 110 presents a high impedance state. When the comparator 111 is enabled, its output terminal dout outputs the intermediate signal Pm of the PWM signal, so that the output terminal dout of the CP signal generating unit 110 generates a CP signal.

[0044] Please refer to Figure 3 The CP signal generating unit 110 further includes: an enable control unit 112, whose input end is used to receive the CP mode control signal CP_M_C, and whose output end is connected to the enable end SD of the comparator 111, and is used to output an enable signal EN according to the CP mode control signal CP_M_C; a resistor unit 113, connected between the output end of the comparator 111 and the CP signal port dm; wherein the comparator 111 further includes an inverting input end for receiving a DC reference voltage LVD1, and a non-inverting input end for receiving a first PWM signal P1, wherein the output end of the comparator 111 is used to output an intermediate signal Pm.

[0045] Thus, when the enable control unit 112 generates the enable signal EN to enable the comparator 111 according to the CP mode control signal CP_M_C, the comparator 111 outputs the intermediate signal Pm of the PWM signal according to the DC reference voltage LVD1 at its inverting input terminal and the first PWM signal P1 at its non-inverting input terminal.

[0046] In a specific embodiment, if Figure 3As shown, the comparator 111 is also connected to the fifth positive DC voltage terminal +LVD5 (such as 12V) and the fifth negative DC voltage terminal -LVD5 (such as -12V), then the comparator 111 can convert the first PWM signal P1 with an amplitude switching between 0V and 3.3V into an intermediate signal Pm of the PWM signal with an amplitude switching between positive and negative 12V.

[0047] Thus, when the enable control unit 112 generates the enable signal EN according to the CP mode control signal CP_M_C to disable the comparator 111 , the comparator 111 is not affected by the DC reference voltage LVD1 and the first PWM signal P1 , so that the output terminal is always in a high impedance state.

[0048] In specific implementation, Figure 3 As shown, a resistor-capacitor parallel branch formed by a third resistor R3 and a first capacitor C1 in parallel is further included between the inverting input terminal of the comparator 111 and the ground terminal. The inverting input terminal of the comparator 111 receives a DC reference voltage LVD1 through a seventeenth resistor R17.

[0049] In specific implementation, Figure 3 As shown, a resistor-capacitor parallel branch formed by a fourth resistor R4 and a second capacitor C2 in parallel is further included between the non-inverting input terminal of the comparator 111 and the ground terminal. The non-inverting input terminal of the comparator 111 receives the first PWM signal P1 through an eighteenth resistor R18.

[0050] like Figure 3 As shown, the resistor unit 113 is connected between the output end of the comparator 111 and the CP signal port dm. When the comparator 111 outputs the intermediate signal Pm of the PWM signal, the resistor unit 113 converts the intermediate signal Pm of the PWM signal into the CP signal required by the symbol standard. In the current standard requirements, the equivalent impedance of the resistor unit 113 is 1K. Of course, its equivalent impedance can also be changed according to the standard requirements. In specific implementation, it can be implemented by a single resistor or by multiple resistors connected in series and parallel.

[0051] like Figure 3 As shown, in a specific implementation, the enable control unit 112 includes a first transistor S1, the base of the first transistor S1 receives the CP mode control signal CP_M_C through a ninth resistor R9, the collector of the first transistor S1 is connected to the enable terminal SD of the comparator 111 through a sixth resistor R6, the emitter of the first transistor S1 is grounded GND, and an eighth resistor R8 is connected between the collector and emitter of the first transistor S1.

[0052] Furthermore, Figure 3As shown, a fourth capacitor C4 is connected between the base and emitter of the first transistor S1. The base of the first transistor S1 is also connected to the first end of the seventh resistor R7, the second end of the seventh resistor R7 is connected to the first end of the resistor-capacitor parallel branch formed by the fifth resistor R5 and the third capacitor C3 in parallel, and the second end of the resistor-capacitor parallel branch is connected to an end of the sixth resistor R6 connected to the enable terminal SD of the comparator 111. The second end of the seventh resistor R7 is also connected to the fifth negative DC voltage terminal -LVD5.

[0053] In actual implementation, the CP mode control signal CP_M_C is high or low, which depends on the vehicle control logic. In this way, the high or low CP mode control signal CP_M_C can control the on or off of the first transistor S1, so that the enable terminal SD is high or low, and the comparator 111 is enabled or disabled, so as to control the CP signal generating unit 110 to output the CP signal or its output terminal presents a high impedance state.

[0054] Please refer to Figure 3 As shown, the CP signal detection unit 130 includes: a first diode D1, whose anode is connected to the CP signal port dm; a first switch resistor series unit 131, including a first resistor Re1 and a first switch tube Q1 connected in series between the cathode of the first diode D1 and the ground terminal GND, wherein the control end of the first switch tube Q1 is used to receive a first switch control signal Cs1; a second switch resistor series unit 132, including a second resistor Re2 and a second switch tube Q2 connected in series between the cathode of the first diode D1 and the ground terminal GND; a switch control unit 133, whose input end is used to receive the CP mode control signal CP_M_C, and whose output end is used to output a second switch control signal Cs2 for controlling the second switch tube Q2.

[0055] Similarly, when the CP mode control signal CP_M_C is at a high level or a low level, the switch control unit 133 outputs a second switch control signal Cs2 for controlling the second switch tube Q2 to be turned on or off according to the high level or low level CP mode control signal CP_M_C.

[0056] Specifically, when the electric vehicle is in charging mode, the switch control unit 133 outputs a high-level second switch control signal Cs2 according to the CP mode control signal CP_M_C, so that the second switch tube Q2 is always turned on. After the charging gun establishes a handshake with the on-board charger, the CPU sends a high-level first switch control signal Cs1, so that the first switch tube Q1 switches from off to on. If the voltage of the CP signal port dm meets the requirements at this time (under normal circumstances, the voltage at this point will switch from 9V to 6V), the external charging pile sends a CP signal to the CP signal port dm, and the CP signal detection unit 130 receives the CP signal through the first end, and detects the CP signal to output the CP detection signal Ps. At this time, the output end of the CP signal generating unit 110 is in a high-impedance state, which does not affect the CP signal detection unit 130.

[0057] Specifically, when the electric vehicle is in the wave-generating mode (charging the load), the switch control unit 133 outputs a low-level second switch control signal Cs2 according to the CP mode control signal CP_M_C, so that the second switch tube Q2 is turned off, and the CPU also sends a low-level first switch control signal Cs1, so that the first switch tube Q1 is turned off, thereby disconnecting the impedance in the CP signal detection unit 130, thereby avoiding the influence of its internal impedance on the CP signal generating unit 110 in the wave-generating state.

[0058] like Figure 3 As shown, in a specific implementation, the switch control unit 133 includes a second transistor S2, the base of the second transistor S2 receives the CP mode control signal CP_M_C through the nineteenth resistor R19, the collector of the second transistor S2 is connected to the second DC voltage terminal LVD2 through the fifteenth resistor R15, the emitter of the second transistor S2 is grounded GND, and the collector of the second transistor S2 is connected to the control end of the second switch tube W2.

[0059] Furthermore, Figure 3 As shown, a resistor-capacitor parallel branch formed by a fourteenth resistor R14 and a sixth capacitor C6 in parallel is connected between the base and the emitter of the second transistor S2.

[0060] In actual implementation, the CP mode control signal CP_M_C is high or low, which depends on the vehicle control logic. Thus, the high or low CP mode control signal CP_M_C generates a low or high second switch control signal Cs2 to control the second switch tube Q2 to be turned off or on.

[0061] Furthermore, Figure 3 As shown, the control end of the second switch tube Q2 is connected to the collector of the second transistor S2 through the sixteenth resistor R16, and a seventh capacitor C7 is connected between the control end of the second switch tube Q2 and the ground end GND.

[0062] Furthermore, Figure 3 As shown, the control end of the first switch tube Q1 receives the first switch control signal Cs1 through the thirteenth resistor R13, and a resistor-capacitor parallel branch formed by the twelfth resistor R12 and the fifth capacitor C5 in parallel is connected between the control end of the first switch tube Q1 and the ground end GND.

[0063] In actual implementation, the enabling control unit 112 is configured and the switch control unit 133 is configured so that: when the CP mode control signal CP_M_C controls the comparator 111 to be enabled, the second switch tube Q2 is turned off to output the CP signal at the CP signal port dm, that is, it works in the wave transmission mode; when the CP mode control signal CP_M_C controls the comparator 111 to be disabled, the second switch tube Q2 is turned on to receive the CP signal at the CP signal port dm to output the CP detection signal Ps at the cathode of the first diode D1, that is, it works in the detection mode. The CP signal processing circuit 100 of the bidirectional on-board charger works in the wave transmission mode or the detection mode according to the CP mode control signal CP_M_C.

[0064] In a specific implementation, the comparator 111 is enabled at a low level. Figure 3 As shown, the first transistor S1 is of PNP type, and the second transistor S2 is of NPN type. At this time, when the CP mode control signal CP_M_C is at a high level, the first transistor S1 is turned off, the second transistor S2 is turned on, the enable signal EN output by the enable control unit 112 is at a low level, the comparator 111 is enabled, the switch control unit 133 outputs a low-level second switch control signal Cs2, the second switch tube Q2 is turned off, and the CP signal processing circuit 100 of the bidirectional on-board charger operates in the wave-generating mode, that is, the CP signal is output at the CP signal port dm through the CP signal generating unit 110; when the CP mode control signal CP_M_C is at a high level, the first transistor S1 is turned off, the second transistor S2 is turned on, and the enable signal EN output by the enable control unit 112 is at a low level, the comparator 111 is enabled, the switch control unit 133 outputs a low-level second switch control signal Cs2, and the second switch tube Q2 is turned off. The CP signal processing circuit 100 of the bidirectional on-board charger operates in the wave-generating mode, that is, the CP signal is output at the CP signal port dm through the CP signal generating unit 110; when the CP mode control signal CP_M_C is at a high level, the first transistor S1 is turned off, the second transistor S2 is turned on, and the second transistor S2 is turned off. When the control signal CP_M_C is at a low level, the first transistor S1 is turned on, the second transistor S2 is turned off, the enable signal EN output by the enable control unit 112 is at a high level, the comparator 111 is not enabled, the switch control unit 133 outputs a high-level second switch control signal Cs2, the second switch tube Q2 is turned on, and the CP signal processing circuit 100 of the bidirectional on-board charger operates in the detection mode, that is, the CP signal is detected by the CP signal detection unit 130, and the output end of the CP signal generation unit 110 is in a high-impedance state.

[0065] In a specific implementation, the comparator 111 is enabled at a low level. Figure 4The schematic diagram of the CP signal processing circuit of the bidirectional on-board charger of another specific embodiment of the present application is shown, the first transistor S1 is of NPN type, and the second transistor S2 is of PNP type. At this time, when the CP mode control signal CP_M_C is at a high level, the first transistor S1 is turned on, the second transistor S2 is turned off, the enable signal EN output by the enable control unit 112 is at a high level, the comparator 111 is not enabled, the switch control unit 133 outputs a high-level second switch control signal Cs2, the second switch tube Q2 is turned on, and the CP signal processing circuit 100 of the bidirectional on-board charger works in the detection mode, that is, the CP signal is detected by the CP signal detection unit 130, and the output of the CP signal generation unit 110 is turned on. The end is in a high-impedance state; when the CP mode control signal CP_M_C is at a low level, the first transistor S1 is turned off, the second transistor S2 is turned on, the enable signal EN output by the enable control unit 112 is at a low level, the comparator 111 is enabled, the switch control unit 133 outputs a low-level second switch control signal Cs2, the second switch tube Q2 is turned off, and the CP signal processing circuit 100 of the bidirectional on-board charger operates in a wave-generating mode, that is, the CP signal is output at the CP signal port dm through the CP signal generating unit 110.

[0066] In a specific implementation, the comparator 111 is enabled at a high level. Figure 5 The schematic diagram of the CP signal processing circuit of the bidirectional on-board charger of another specific embodiment of the present application is shown, the first transistor S1 is a PNP type, and the second transistor S2 is a PNP type. At this time, when the CP mode control signal CP_M_C is at a high level, the first transistor S1 is turned off, the second transistor S2 is turned off, the enable signal EN output by the enable control unit 112 is at a low level, the comparator 111 is not enabled, the switch control unit 133 outputs a high-level second switch control signal Cs2, the second switch tube Q2 is turned on, and the CP signal processing circuit 100 of the bidirectional on-board charger works in the detection mode, that is, the CP signal is detected by the CP signal detection unit 130, and the output of the CP signal generation unit 110 is turned on. The end is in a high-impedance state; when the CP mode control signal CP_M_C is at a low level, the first transistor S1 is turned on, the second transistor S2 is turned on, the enable signal EN output by the enable control unit 112 is at a high level, the comparator 111 is enabled, the switch control unit 133 outputs a low-level second switch control signal Cs2, and the second switch tube Q2 is turned off. The CP signal processing circuit 100 of the bidirectional on-board charger operates in a wave-generating mode, that is, the CP signal is output at the CP signal port dm through the CP signal generating unit 110.

[0067] In a specific implementation, the comparator 111 is enabled at a high level. Figure 6The schematic diagram of the CP signal processing circuit of a bidirectional on-board charger of another specific embodiment of the present application is shown, in which the first transistor S1 is of NPN type and the second transistor S2 is of NPN type. At this time, when the CP mode control signal CP_M_C is at a high level, the first transistor S1 is turned on, the second transistor S2 is turned on, the enable signal EN output by the enable control unit 112 is at a high level, the comparator 111 is enabled, the switch control unit 133 outputs a low-level second switch control signal Cs2, and the second switch tube Q2 is turned off. The CP signal processing circuit 100 of the bidirectional on-board charger operates in the wave-generating mode, that is, the CP signal is output at the CP signal port dm through the CP signal generating unit 110; ... When the control signal CP_M_C is at a low level, the first transistor S1 is turned off, the second transistor S2 is turned off, the enable signal EN output by the enable control unit 112 is at a low level, the comparator 111 is not enabled, the switch control unit 133 outputs a high-level second switch control signal Cs2, the second switch tube Q2 is turned on, and the CP signal processing circuit 100 of the bidirectional on-board charger operates in the detection mode, that is, the CP signal is detected by the CP signal detection unit 130, and the output end of the CP signal generation unit 110 is in a high-impedance state.

[0068] That is, as long as the enabling control unit 112 and the switch control unit 133 are configured so that the CP signal processing circuit 100 of the bidirectional on-board charger operates in the wave transmission mode or the detection mode according to the different levels of the CP mode control signal CP_M_C, the specific structure of the enabling control unit 112 and the switch control unit 133 is not limited in this application.

[0069] Furthermore, in an embodiment of the present application, the CP signal generating unit 110 further includes: a second diode D2, the anode of which is connected to the output terminal of the comparator 111, and the cathode of which is connected to the third positive voltage terminal LVD3+; a third diode D3, the anode of which is connected to the fourth negative voltage terminal LVD4-, and the cathode of which is connected to the output terminal of the comparator 111, which can be referred to Figure 7 The schematic diagram of the CP signal processing circuit of the bidirectional on-board charger of another specific embodiment of the present application is shown. Usually, the levels of the third positive voltage terminal LVD3+ and the fourth negative voltage terminal LVD4- are equal, and the second diode D2 and the third diode D3 constitute a comparator 111 protection unit, which is used to protect the comparator from a voltage greater than the level value of the third positive voltage terminal LVD3+ and the fourth negative voltage terminal LVD4-, so that the comparator 111 can work reliably.

[0070] As described above, when the comparator 111 is enabled, it outputs a PWM signal with an amplitude of plus or minus 12V, and the third positive voltage terminal LVD3+ can be selected to be +12V, and the fourth negative voltage terminal LVD4- can be selected to be -12V.

[0071] In actual implementation, the CP mode control signal CP_M_C, the first switch control signal Cs1 and the first PWM signal P1 are all issued by the vehicle controller (such as the vehicle CPU). That is, the specific working state of the CP signal processing circuit 100 of the bidirectional on-board charger is determined by the vehicle controller.

[0072] In one embodiment of the present application, an electric vehicle is also provided. Figure 8 The electric vehicle schematic diagram of an embodiment of the present application is shown, which includes a bidirectional on-board charger 300; the CP signal processing circuit 100 of the bidirectional on-board charger mentioned above; and a controller 200. When the electric vehicle 30 needs to charge the charged device, the controller 200 generates the CP mode control signal CP_M_C of the first level and the first switch control signal Cs1 of the low level, so that the CP signal processing circuit of the bidirectional on-board charger works in the wave transmission mode, and the CP signal port dm outputs the CP signal to the charged device; when the high-voltage battery in the electric vehicle needs to be charged, the controller generates the CP mode control signal CP_M_C of the second level, so that the CP signal processing circuit of the bidirectional on-board charger works in the detection mode, the CP signal port dm receives the CP signal, and the cathode of the first diode outputs the CP detection signal Ps.

[0073] In specific implementation, in the wave generation mode, the load is charged by the bidirectional on-board charger 300; in the detection mode, the high-voltage power battery in the electric vehicle is charged by the bidirectional on-board charger 300.

[0074] When the first level is a high level, the second level is a low level. Or, when the first level is a low level, the second level is a high level.

[0075] In specific implementation, Figure 8 As shown, the CP signal generating unit 110 is integrated into the controller 200 of the electric vehicle 30. This can further reduce the volume of the circuit in the electric vehicle 30.

[0076] In actual implementation, the above-mentioned comparator 111 and its peripheral circuits, the first transistor S1 and its peripheral circuits, and the second transistor S2 and its peripheral circuits are not limited to the above-mentioned specific structures, as long as they can achieve the above-mentioned functions. According to different applications and design requirements, there may be many changes, alternatives and modifications, which can be easily obtained by those skilled in the art from the disclosed content of this disclosure.

[0077] Although the embodiments of the present disclosure and its advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the disclosure as defined by the appended claims.

[0078] In addition, the scope of the present application is not intended to be limited to the specific embodiments of the processes, machines, manufactures, material compositions, devices, methods, and steps described in the specification. As one of ordinary skill in the art will readily appreciate from the disclosure of this disclosure, processes, machines, manufactures, material compositions, means, methods, or steps that perform substantially the same functions currently exist or will later be developed or achieve substantially the same results as the corresponding embodiments described herein that can be used according to this disclosure. Therefore, the appended claims are intended to include such processes, machines, manufactures, material compositions, devices, methods, or steps within their scope.

Claims

1. A CP signal processing circuit for a bidirectional on-board charger, characterized in that: include: A CP signal generating unit, the input end of which is used to receive a CP mode control signal, the output end of which is connected to a CP signal port, and is configured to output a CP signal at the output end or make the output end present a high impedance state according to the CP mode control signal, wherein the CP signal generating unit comprises: A comparator, the comparator comprising an enable terminal, the enable terminal receiving an enable signal generated according to the CP mode control signal; An enable control unit, whose input end is used to receive a CP mode control signal, and whose output end is connected to the enable end, and is used to output the enable signal according to the CP mode control signal; A resistor unit connected between the output end of the comparator and the CP signal port; The comparator further comprises an inverting input terminal for receiving a DC reference voltage and a non-inverting input terminal for receiving a first PWM signal, wherein the output terminal of the comparator is used to output an intermediate signal; A CP signal detection unit, the input end of which is used to receive the CP mode control signal, the first end of which is connected to the CP signal port, the CP signal detection unit is configured to output a CP detection signal at its output end according to whether the CP mode control signal is not working or working in the detection mode; wherein When the output end of the CP signal generating unit outputs the CP signal according to the CP mode control signal, the CP signal detecting unit does not work; When the output end of the CP signal generating unit is in a high impedance state according to the CP mode control signal, the CP signal detecting unit works in a detection mode and outputs a CP detection signal at its output end.

2. The CP signal processing circuit of the bidirectional on-board charger according to claim 1, characterized in that: The CP signal detection unit comprises: A first diode, an anode of which is connected to the CP signal port; A first switch resistor series unit, comprising a first resistor and a first switch tube connected in series between the cathode of the first diode and a ground terminal, wherein a control terminal of the first switch tube is used to receive a first switch control signal; A second switch resistor series unit, comprising a second resistor and a second switch tube connected in series between the cathode of the first diode and the ground terminal; A switch control unit, wherein the input end is used to receive the CP mode control signal, and the output end is used to output a second switch control signal for controlling the second switch tube.

3. The CP signal processing circuit of the bidirectional on-board charger according to claim 2, characterized in that: The enabling control unit is configured and the switch control unit is configured such that: When the CP mode control signal controls the comparator to be enabled, the second switch tube is turned off to output a CP signal at the CP signal port; When the CP mode control signal controls the comparator to be disabled, the second switch tube is turned on to receive the CP signal at the CP signal port to output a CP detection signal at the cathode of the first diode.

4. The CP signal processing circuit of the bidirectional on-board charger according to claim 3, characterized in that: The enabling control unit comprises a first transistor, the base of the first transistor receives the CP mode control signal through a resistor, the collector of the first transistor is connected to the enabling terminal of the comparator through a resistor, the emitter of the first transistor is grounded, and a resistor is connected between the collector and the emitter of the first transistor; The switch control unit includes a second transistor, the base of the second transistor receives the CP mode control signal through a resistor, the collector of the second transistor is connected to the second DC voltage end through a resistor, the emitter of the second transistor is grounded, and the collector of the second transistor is connected to the control end of the second switch tube.

5. The CP signal processing circuit of the bidirectional on-board charger according to claim 4, characterized in that: The comparator is low level enabled, the first transistor is of PNP type, and the second transistor is of NPN type.

6. The CP signal processing circuit of the bidirectional on-board charger according to claim 4, characterized in that: The comparator is low level enabled, the first transistor is of NPN type, and the second transistor is of PNP type.

7. The CP signal processing circuit of the bidirectional on-board charger according to claim 4, characterized in that: The comparator is high level enabled, the first transistor is NPN type, and the second transistor is NPN type.

8. The CP signal processing circuit of the bidirectional on-board charger according to claim 4, characterized in that: The comparator is enabled at a high level, the first transistor is of PNP type, and the second transistor is of PNP type.

9. The CP signal processing circuit of the bidirectional on-board charger according to claim 1, characterized in that: The CP signal generating unit also includes: a second diode, an anode of which is connected to the output terminal of the comparator, and a cathode of which is connected to the third positive voltage terminal; The third diode has an anode connected to the fourth negative voltage terminal and a cathode connected to the output terminal of the comparator.

10. An electric vehicle, characterized in that: include: Bidirectional on-board charger; The CP signal processing circuit of the bidirectional on-board charger according to claim 2; The controller generates the CP mode control signal of the first level and the first switch control signal of the low level when the electric vehicle needs to charge the charged device, so that the CP signal processing circuit of the bidirectional on-board charger operates in the wave transmission mode, and the CP signal port outputs the CP signal to the charged device; when the high-voltage battery in the electric vehicle needs to be charged, the controller generates the CP mode control signal of the second level, so that the CP signal processing circuit of the bidirectional on-board charger operates in the detection mode, the CP signal port receives the CP signal, and the cathode of the first diode outputs the CP detection signal.

11. The electric vehicle according to claim 10, characterized in that: The CP signal generating unit is integrated in a controller of the electric vehicle.

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