A double-edge trigger circuit for OBC charging wake-up

Abstract

The present invention discloses a double-edge trigger circuit for OBC charging wake-up, including a wake-up switch circuit connected to a circuit to be awakened, wherein the wake-up switch circuit outputs a wake-up trigger signal to wake up the circuit to be awakened when in operation, and also includes a trigger circuit connected to the wake-up switch circuit and used to control the wake-up switch circuit to send the wake-up trigger signal, wherein the trigger circuit can control the wake-up switch circuit to output the wake-up trigger signal when the connected CP signal is at a rising edge or a falling edge. Compared with the prior art, the present invention has the characteristics of rising and falling double-edge triggering, which can meet the functions of OBC plug-in wake-up, pull-out wake-up, and scheduled charging during charging. It has the advantages of simple circuit and low cost, and the wake-up does not require the participation of the MCU controller, has high reliability, and has low static current in sleep mode.

Description

Technical Field

[0001] The invention relates to the field of on-board charger systems, and in particular to a double-edge trigger circuit for OBC charging wake-up. Background Art

[0002] The traditional CP wake-up circuit can only wake up the OBC when the charging gun is plugged in, that is, the OBC system can only be woken up when the CP signal of the OBC charging port changes from 0 to 12V level or from 0 to PWM signal. The traditional CP wake-up circuit cannot realize the wake-up function when the gun is pulled out in the dormant state after charging (12V level changes to 0) and the scheduled charging function when the gun is plugged in (12V level changes to PWM). If you want to realize the wake-up function when the gun is pulled out or the scheduled charging (level to PWM) wake-up function, you need to configure an additional MCU to detect the CP state. The MCU needs to work all the time and cannot be completely dormant, resulting in a high static current when dormant, and will also increase the additional circuit cost.

[0003] Therefore, how to design a double-edge trigger circuit for OBC charging wake-up that can realize the CP signal multiple state wake-up function is a technical problem that the industry needs to solve urgently. Summary of the invention

[0004] In view of the shortcomings in the prior art that the wake-up circuit after the OBC is connected to the charging pile can only be awakened after the gun is plugged in or requires the MCU to participate in identifying the action state of the CP, resulting in a large leakage current of the wake-up circuit, the present invention proposes a double-edge trigger circuit for OBC charging wake-up.

[0005] The technical solution of the present invention is to propose a double-edge trigger circuit for OBC charging wake-up, including a wake-up switch circuit connected to the circuit to be awakened, and the wake-up switch circuit outputs a wake-up trigger signal to wake up the circuit to be awakened when working, and also includes a trigger circuit connected to the wake-up switch circuit and used to control the wake-up switch circuit to send the wake-up trigger signal. The trigger circuit can control the wake-up switch circuit to output the wake-up trigger signal when the connected CP signal is at a rising edge or a falling edge.

[0006] Further, the trigger circuit comprises:

[0007] A CP rising edge trigger circuit, which is used to control the wake-up switch circuit to output the wake-up trigger signal when the connected CP signal is at a rising edge;

[0008] The CP falling edge trigger circuit is used to control the wake-up switch circuit to output the wake-up trigger signal when the connected CP signal is at a falling edge.

[0009] Further, the wake-up switch circuit includes: a diode D1, a diode D2, a resistor R1, a resistor R2, a resistor RL, a MOS tube Q1, and a capacitor CL;

[0010] The anode of the diode D1 is connected to the power supply, and the cathode is connected to the source of the MOS tube Q1. The drain of the MOS tube is connected to the anode of the diode D2. The cathode of the diode D2 is connected to the wake-up circuit. One end of the resistor R2 is connected to the cathode of the MOS tube Q1, and the other end is connected to the output end of the trigger circuit as the input end of the wake-up switch circuit. The resistor R1 is respectively connected between the source and the drain of the MOS tube Q1. One end of the resistor RL is connected between the diode D2 and the wake-up circuit, and the other end is grounded. One end of the capacitor CL is connected between the secondary hook D2 and the wake-up circuit, and the other end is grounded.

[0011] Furthermore, the CP falling edge trigger circuit includes a first drive shutdown circuit and a drive negative voltage generating circuit.

[0012] Further, the first drive shutdown circuit includes a MOS tube Q2, the drain of the MOS tube Q2 is connected to the input end of the wake-up switch circuit as the output end of the CP falling edge trigger circuit, the gate is grounded, and the source is connected to the output end of the drive negative voltage generating circuit.

[0013] Furthermore, the driving negative voltage generating circuit includes: a capacitor C1, a resistor R3, a resistor R4, and a diode D3;

[0014] The anode of the diode D3 is connected to the source of the MOS tube Q2, and the cathode is grounded. One end of the resistor R4 is connected to the CP signal, and the other end is connected to the capacitor C1. The other end of the capacitor C1 is connected between the MOS tube Q2 and the diode D3 as the output end of the driving negative voltage generating circuit. Both ends of the resistor R3 are respectively connected to the gate and the source of the MOS tube Q2.

[0015] Furthermore, the CP rising edge trigger circuit includes a drive holding circuit and a second drive shutoff circuit.

[0016] Furthermore, the second drive shutdown circuit includes: a MOS tube Q3, a resistor R8, and a capacitor C3;

[0017] The source of the MOS tube Q3 is grounded, the gate is connected to the output end of the drive holding circuit as the input end of the second drive shutdown circuit, and the drain is connected to one end of the resistor R8. The other end of the resistor R8 is connected to the input end of the wake-up switch circuit as the output end of the second drive shutdown circuit, and the capacitor C3 is connected in parallel to both ends of the resistor R8.

[0018] Further, the driving and holding circuit includes: a diode D4, a resistor R5, a resistor R6, a resistor R7, and a capacitor C2;

[0019] The positive electrode of the diode D4 is connected to the CP signal, and the negative electrode is connected to one end of the resistor R6. The other end of the resistor R6 is connected to the negative electrode of the MOS tube Q3 as the output end of the drive holding circuit. One end of the resistor R5 is connected between the diode D4 and the resistor R6, and the other end is grounded. One end of the capacitor C2 is connected between the resistor R6 and the MOS tube Q3, and the other end is grounded. One end of the resistor R7 is connected between the resistor R6 and the MOS tube Q3, and the other end is grounded.

[0020] Furthermore, the time constants of the resistor R8 and the capacitor C3 are set according to the duration of the CP wake-up after the gun is plugged in.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects:

[0022] Through the trigger circuit, the present invention has the characteristics of rising and falling double-edge triggering, which can meet the OBC plug-in wake-up, pull-out wake-up, and scheduled charging functions during charging. It has the advantages of simple circuit and low cost. At the same time, the wake-up does not require the participation of the MCU controller, the reliability is high, and the static current is low in sleep operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the prior art description. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative labor.

[0024] Figure 1 The schematic diagram of the double-edge trigger circuit for OBC charging wake-up of the present invention is shown in FIG.

[0025] Figure 2 The circuit diagram of the double-edge trigger circuit for OBC charging wake-up of the present invention is shown in FIG. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the present invention, rather than implying that each embodiment of the present invention must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0028] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0029] The traditional CP wake-up circuit can only wake up the OBC when the charging gun is plugged in, that is, the OBC system can only be woken up when the CP signal of the OBC charging port changes from 0 to 12V level or from 0 to PWM signal. The traditional CP wake-up circuit cannot realize the gun-pulling wake-up in the dormant state after charging is completed (12V level changes to 0) and the scheduled charging function in the plugged-in state (12V level changes to PWM). If the gun-pulling wake-up or scheduled charging (level to PWM) wake-up function is to be realized, an additional MCU needs to be configured to detect the CP state. The idea of ​​the present invention is to propose a double-edge trigger circuit for OBC charging wake-up. Through the design of the trigger circuit, it can control the wake-up switch circuit to output a wake-up trigger signal when the CP signal is at the rising edge and the falling edge to wake up the circuit to be awakened.

[0030] Among them, the double-edge trigger circuit proposed in the present invention includes: a wake-up switch circuit and a trigger circuit, the wake-up switch circuit is connected to the circuit to be awakened, and is used to output a wake-up trigger signal to wake up the circuit to be awakened, and the trigger circuit is connected to the wake-up switch circuit, and is used to control the wake-up switch circuit to output a wake-up trigger signal when the connected CP signal is at a rising edge or a falling edge.

[0031] For details, see Figure 1 The wake-up switch circuit is connected between the KL30 power supply and the circuit to be awakened. The trigger circuit includes a CP rising edge trigger circuit and a CP falling edge trigger circuit. The input ends thereof are both connected to the CP signal, and the output ends thereof are both connected to the wake-up switch circuit. The CP rising edge trigger circuit is used to control the wake-up switch circuit to output the wake-up trigger circuit when the CP signal is at the rising edge, and the CP falling edge trigger circuit is used to control the wake-up switch circuit to output the wake-up trigger circuit when the CP signal is at the falling edge, thereby realizing the double-edge wake-up function.

[0032] See also Figure 2 The wake-up switch circuit includes: a diode D1, a diode D2, a resistor R1, a resistor R2, a resistor RL, a MOS tube Q1, and a capacitor CL;

[0033] Among them, the positive electrode of the diode D1 is connected to the power supply, and the negative electrode is connected to the source of the MOS tube Q1, the drain of the MOS tube is connected to the positive electrode of the diode D2, the negative electrode of the diode D2 is connected to the wake-up circuit, one end of the resistor R2 is connected to the negative electrode of the MOS tube Q1, and the other end is connected to the output end of the trigger circuit as the input end of the wake-up switch circuit, the resistor R1 is respectively connected between the source and the drain of the MOS tube Q1, one end of the resistor RL is connected between the diode D2 and the wake-up circuit, and the other end is grounded, and one end of the capacitor CL is connected between the secondary hook D2 and the wake-up circuit, and the other end is grounded.

[0034] In this embodiment, the negative output of D2 is a Wakeup signal (wakeup trigger signal) used to wake up the circuit to be awakened. This signal can be used as an enable signal for the auxiliary power supply. The resistor RL and the capacitor CL form a holding circuit that can maintain the output time of the Wakeup signal. The on and off of the MOS tube Q1 is controlled by the trigger circuit connected to its gate. Only when the MOS tube Q1 is in the on state, the signal output by the power supply KL30 can output the Wakeup signal to the circuit to be awakened through the diode D2.

[0035] See also Figure 2 The CP falling edge trigger circuit includes a first drive shutdown circuit and a drive negative voltage generating circuit, wherein the first drive shutdown circuit includes a MOS tube Q2; the drain of the MOS tube Q2 is connected to the input end of the wake-up switch circuit as the output end of the CP falling edge trigger circuit, the gate is grounded, and the source is connected to the output end of the drive negative voltage generating circuit;

[0036] The driving negative voltage generating circuit includes: a capacitor C1, a resistor R3, a resistor R4, and a diode D3; the positive electrode of the diode D3 is connected to the source of the MOS tube Q2, and the negative electrode is grounded; one end of the resistor R4 is connected to the CP signal, and the other end is connected to the capacitor C1; the other end of the capacitor C1 is connected between the MOS tube Q2 and the diode D3 as the output end of the driving negative voltage generating circuit, and the two ends of the resistor R3 are respectively connected to the gate and the source of the MOS tube Q2.

[0037] In this embodiment, the drain of the MOS transistor Q2 is connected to the wake-up switch circuit as the output end of the CP falling edge trigger circuit. Only when the MOS transistor Q2 is turned on can it output a control signal to the MOS transistor Q1 in the wake-up switch circuit to turn it on. The driving negative voltage generating circuit is connected to the source of the MOS transistor Q2. It can generate a driving negative voltage when the CP signal is at a falling edge and is used to turn on the MOS transistor Q2, thereby turning on the MOS transistor Q1 to make the wake-up switch circuit work and output a wake-up trigger signal.

[0038] See also Figure 2The CP rising edge trigger circuit includes a drive holding circuit and a second drive shutdown circuit, wherein the second drive shutdown circuit includes: a MOS tube Q3, a resistor R8, and a capacitor C3; the source of the MOS tube Q3 is grounded, the gate is connected to the output end of the drive holding circuit as the input end of the second drive shutdown circuit, the drain is connected to one end of the resistor R8, the other end of the resistor R8 is connected to the input end of the wake-up switch circuit as the output end of the second drive shutdown circuit, and the capacitor C3 is connected in parallel to both ends of the resistor R8.

[0039] The driving and holding circuit includes: a diode D4, a resistor R5, a resistor R6, a resistor R7, and a capacitor C2; the positive electrode of the diode D4 is connected to the CP signal, the negative electrode is connected to one end of the resistor R6, the other end of the resistor R6 is connected to the negative electrode of the MOS tube Q3 as the output end of the driving and holding circuit, one end of the resistor R5 is connected between the diode D4 and the resistor R6, and the other end is grounded, one end of the capacitor C2 is connected between the resistor R6 and the MOS tube Q3, and the other end is grounded, and one end of the resistor R7 is connected between the resistor R6 and the MOS tube Q3, and the other end is grounded.

[0040] In this embodiment, the drain of the MOS tube Q3 is connected to the input end of the wake-up switch circuit through the resistor R8, which is used to control the conduction state of the MOS tube Q1. The resistor R8 and the capacitor C3 are used to ensure the duration of the CP wake-up when the gun is plugged in. When the OBC is in the gun-plugged state and the CP signal is at a rising edge, the CP signal can turn on the MOS tube Q3 through the diode D4 and the resistor R6, and then turn on the MOS tube Q1, so that the wake-up switch circuit works and sends a wake-up trigger signal.

[0041] It can be seen from the settings of the above-mentioned CP rising edge trigger circuit and the CP falling edge trigger circuit that the present invention can realize dual-edge wake-up on the rising edge and the falling edge, and is applicable to the gun-pulling wake-up in the sleep state after charging is completed (12V level becomes 0, equivalent to the falling edge), the charging gun plugging action wake-up (0V level becomes 12V, equivalent to the rising edge), and the scheduled timed charging function (12V level becomes PWM, equivalent to dual-edge wake-up), which can meet the OBC plug-in wake-up, gun-pulling wake-up, and scheduled charging functions during charging.

[0042] Furthermore, the time constants of the resistor R8 and the capacitor C3 are set according to the duration of the CP wake-up after the gun is plugged in. To ensure the duration of the CP wake-up, the time constants of the resistor R8 and the capacitor C3 need to be set large enough.

[0043] Compared with the prior art, the present invention provides a double-edge trigger circuit implemented by a pure hardware circuit, which can realize the CP signal multiple state wake-up function while maintaining a low leakage current size.

[0044] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A double-edge trigger circuit for OBC charging wake-up, comprising a wake-up switch circuit connected to a circuit to be awakened, wherein the wake-up switch circuit outputs a wake-up trigger signal to wake up the circuit to be awakened when in operation, characterized in that: It also includes a trigger circuit connected to the wake-up switch circuit and used to control the wake-up switch circuit to send the wake-up trigger signal, and the trigger circuit can control the wake-up switch circuit to output the wake-up trigger signal when the connected CP signal is at a rising edge or a falling edge; The trigger circuit comprises: A CP rising edge trigger circuit, which is used to control the wake-up switch circuit to output the wake-up trigger signal when the connected CP signal is at a rising edge; A CP falling edge trigger circuit, which is used to control the wake-up switch circuit to output the wake-up trigger signal when the connected CP signal is at a falling edge; The CP rising edge trigger circuit includes a drive holding circuit and a second drive shut-off circuit; The second drive shutdown circuit includes: a MOS tube Q3, a resistor R8, and a capacitor C3; The source of the MOS tube Q3 is grounded, the gate is connected to the output end of the drive holding circuit as the input end of the second drive shutdown circuit, and the drain is connected to one end of the resistor R8. The other end of the resistor R8 is connected to the input end of the wake-up switch circuit as the output end of the second drive shutdown circuit, and the capacitor C3 is connected in parallel to both ends of the resistor R8.

2. The double-edge trigger circuit according to claim 1, characterized in that: The wake-up switch circuit includes: a diode D1, a diode D2, a resistor R1, a resistor R2, a resistor RL, a MOS tube Q1, and a capacitor CL; The positive electrode of the diode D1 is connected to the power supply, and the negative electrode is connected to the source of the MOS tube Q1. The drain of the MOS tube Q1 is connected to the anode of the diode D2, the cathode of the diode D2 is connected to the wake-up circuit, one end of the resistor R2 is connected to the gate of the MOS tube Q1, and the other end is connected to the output end of the trigger circuit as the input end of the wake-up switch circuit, the resistor R1 is respectively connected between the source and the drain of the MOS tube Q1, one end of the resistor RL is connected between the diode D2 and the wake-up circuit, and the other end is grounded, and one end of the capacitor CL is connected between the diode D2 and the wake-up circuit, and the other end is grounded.

3. The double-edge trigger circuit according to claim 1, characterized in that: The CP falling edge trigger circuit includes a first drive shut-off circuit and a drive negative voltage generating circuit.

4. The double-edge trigger circuit according to claim 3, characterized in that: The first drive shutdown circuit includes a MOS transistor Q2, the drain of the MOS transistor Q2 is connected to the input end of the wake-up switch circuit as the output end of the CP falling edge trigger circuit, the gate is grounded, and the source is connected to the output end of the drive negative voltage generating circuit.

5. The double edge trigger circuit according to claim 4, characterized in that: The driving negative voltage generating circuit comprises: a capacitor C1, a resistor R3, a resistor R4, and a diode D3; The anode of the diode D3 is connected to the source of the MOS tube Q2, and the cathode is grounded. One end of R4 is connected to the CP signal, and the other end is connected to the capacitor C1. The other end of the capacitor C1 is connected between the MOS tube Q2 and the diode D3 as the output end of the driving negative voltage generating circuit. The two ends of the resistor R3 are respectively connected to the gate and source of the MOS tube Q2.

6. The double-edge trigger circuit according to claim 1, characterized in that: The driving and holding circuit includes: a diode D4, a resistor R5, a resistor R6, a resistor R7, and a capacitor C2; The anode of the diode D4 is connected to the CP signal, and the cathode is connected to one end of the resistor R6. The other end of the resistor R6 is connected to the gate of the MOS transistor Q3 as the output end of the drive holding circuit, one end of the resistor R5 is connected between the diode D4 and the resistor R6, and the other end is grounded, one end of the capacitor C2 is connected between the resistor R6 and the MOS transistor Q3, and the other end is grounded, and one end of the resistor R7 is connected between the resistor R6 and the MOS transistor Q3, and the other end is grounded.

7. The double edge trigger circuit according to claim 1, characterized in that: The time constants of the resistor R8 and the capacitor C3 are set according to the duration of the CP wake-up after the gun is plugged in.

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