Novel energy alternating-current mode two-double-plug power input anti-electric-shock circuit

Abstract

The utility model relates to the field of charging circuits, in particular to a novel energy alternating current mode two-double-plug power input anti-electric shock circuit, which comprises a first charging circuit, a second charging circuit and a load circuit R. The output ends of the first charging circuit and the second charging circuit are both connected with the load circuit R. Wherein the first charging circuit and the second charging circuit comprise a plug A, a protection circuit B, an anti-electromagnetic interference circuit C, a rectification circuit D, a high-efficiency power conversion circuit W, an intelligent control circuit P and a relay K; when the input end of the first charging circuit is externally connected with commercial power, current enters the rectifying circuit D through the protection circuit B and the anti-electromagnetic interference circuit C to be rectified, and rectified direct current enters the high-efficiency power conversion circuit W and is supplied to the intelligent control circuit P after power conversion. The intelligent control circuit P controls the corresponding relay K to be closed, so that current flows through the load circuit R; the whole circuit is integrated with double plugs to realize quick charging, and electric shock can be avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a charging circuit field especially a novel energy exchange mode two double plug power input anti-electric shock circuit. BACKGROUND

[0002] With the rapid development of the electric vehicle industry, the demand for charging infrastructure has increased dramatically, and mode two (Mode 2) charging, which uses household alternating current power to charge electric vehicles, is widely welcomed for its convenience and economy. In the current electric vehicle charging technology field, although there are many charging solutions, there are still some significant problems and limitations, which are as follows: Many existing charging systems only support single plug input, and the charging power is limited, resulting in a long charging time. For electric vehicle users, long charging waiting time seriously affects the efficiency and convenience of vehicle use. Some charging systems lack perfect protection mechanisms in design, such as short circuit protection, overcurrent protection, and startup surge protection, which can easily cause safety accidents during charging. At the same time, for charging systems with multiple plug designs, if the plug not connected to the power supply is not handled properly, there may be an electric shock risk, which threatens the safety of users. SUMMARY

[0003] To solve the above problems, the utility model provides a novel energy exchange mode two double plug power input anti-electric shock circuit, which integrates multiple protection mechanisms to ensure safe and reliable charging process; it flexibly meets the charging needs of users in different scenarios and improves user experience.

[0004] To achieve the above purpose, the utility model adopts the technical scheme of a novel energy exchange mode two double plug power input anti-electric shock circuit, which includes a first charging circuit, a second charging circuit, and a load circuit R. The output ends of the first charging circuit and the second charging circuit are connected to the load circuit R. The first charging circuit includes a plug A, a protection circuit B, an anti-electromagnetic interference circuit C, a rectifier circuit D, a high-efficiency power conversion circuit W, an intelligent control circuit P, and a relay K.

[0005] The second charging circuit includes a plug A2, a protection circuit B2, an anti-electromagnetic interference circuit C2, a rectifier circuit D2, a high-efficiency power conversion circuit W2, an intelligent control circuit P2, and a relay K2.

[0006] When the first charging circuit input end is externally connected to the power supply, the current passes through the protection circuit B and the anti-electromagnetic interference circuit C into the rectifier circuit D for rectification. The rectified direct current enters the high-efficiency power conversion circuit W, which supplies power to the intelligent control circuit P after power conversion. The intelligent control circuit P controls the corresponding relay K to close, allowing the current to flow through the load circuit R.

[0007] When the second charging circuit input end is externally connected to the mains, the current passes through the protection circuit B2 and the anti-electromagnetic interference circuit C2 into the rectifier circuit D2 for rectification, and the rectified direct current enters the high-efficiency power conversion circuit W2, which supplies the intelligent control circuit P2 after power conversion. The intelligent control circuit P2 controls the corresponding relay K2 to close to make the current flow through the load circuit R.

[0008] Further, the protection circuit B includes a fuse F3 and a thermal resistor RT2, which are connected in series to the input L end of the plug A. The protection circuit B2 includes a circuit fuse F4 and a thermal resistor RT1, which are connected in series to the input L end of the plug A2.

[0009] Further, the anti-electromagnetic interference circuit C includes a safety X capacitor CX2, a common-mode inductor L3, and a safety X capacitor CX3, wherein the two ends of the safety X capacitor CX2 are connected to the mains input L end and the mains input N end, the input end of the common-mode inductor L3 is connected to the mains input L end and the mains input N end, and the two ends of the safety X capacitor CX3 are connected to the output ends of the common-mode inductor L3. The anti-electromagnetic interference circuit C2 includes a safety X capacitor CX4, a common-mode inductor L6, and a safety X capacitor CX1, wherein the two ends of the safety X capacitor CX4 are connected to the mains input L end and the mains input N end, the input end of the common-mode inductor L6 is connected to the mains input L end and the mains input N end, and the two ends of the safety X capacitor CX1 are connected to the output ends of the common-mode inductor L6.

[0010] Further, the rectifier circuit D includes a first rectifier bridge D6, the two ends of the safety X capacitor CX3 are connected to the AC input end of the first rectifier bridge D6, the positive DC output end of the first rectifier bridge D6 is connected to the positive pole of the subsequent R load circuit, and the negative DC output end of the first rectifier bridge D6 is connected to the relay K. The rectifier circuit D2 includes a third rectifier bridge D3, the two ends of the safety X capacitor CX1 are connected to the AC input end of the third rectifier bridge D3, the positive DC output end of the third rectifier bridge D3 is connected to the positive pole of the subsequent R load circuit, and the negative DC output end of the third rectifier bridge D3 is connected to the relay K2 circuit.

[0011] Further, the high-efficiency power conversion circuit W2 comprises a fourth rectifier bridge D4, a capacitor CE1, a power conversion chip U2, a common-mode inductor L5, a capacitor CE4, a capacitor C1, and a resistor R21. First, the output end of the common-mode inductor L5 is connected to the input end of the fourth rectifier bridge D4. One end of the capacitor CE1 is connected to the output positive pole of the fourth rectifier bridge D4, and the other end is connected to the output negative pole of the fourth rectifier bridge D4. Meanwhile, the output positive pole of the fourth rectifier bridge D4 is connected to the DR pin of the power conversion chip U2, and the GND pin of the power conversion chip U2 is connected to the output negative pole of the fourth rectifier bridge D4. The VOUT pin of the power conversion chip U2 is connected to one end of the common-mode inductor L5 and the capacitor CE4, and the other end of the capacitor CE4 is connected to the output negative pole of the fourth rectifier bridge D4. The other end of the common-mode inductor L5 is connected to the IC-GND pin of the power conversion chip U2. The two ends of the capacitor C1 are connected to the VOUT pin and the GND pin of the power conversion chip U2, respectively. The two ends of the resistor R21 are connected to the VOUT pin and the GND pin of the power conversion chip U2, respectively.

[0012] Further, the high-efficiency power conversion circuit W2 comprises a fourth rectifier bridge D4, a capacitor CE1, a power conversion chip U2, a common-mode inductor L5, a capacitor CE4, a capacitor C1, and a resistor R21. First, the output end of the common-mode inductor L5 is connected to the input end of the fourth rectifier bridge D4. One end of the capacitor CE1 is connected to the output positive pole of the fourth rectifier bridge D4, and the other end is connected to the output negative pole of the fourth rectifier bridge D4. Meanwhile, the output positive pole of the fourth rectifier bridge D4 is connected to the DR pin of the power conversion chip U2, and the GND pin of the power conversion chip U2 is connected to the output negative pole of the fourth rectifier bridge D4. The VOUT pin of the power conversion chip U2 is connected to one end of the common-mode inductor L5 and the capacitor CE4, and the other end of the capacitor CE4 is connected to the output negative pole of the fourth rectifier bridge D4. The other end of the common-mode inductor L5 is connected to the IC-GND pin of the power conversion chip U2. The two ends of the capacitor C1 are connected to the VOUT pin and the GND pin of the power conversion chip U2, respectively. The two ends of the resistor R21 are connected to the VOUT pin and the GND pin of the power conversion chip U2, respectively.

[0013] Further, the intelligent control circuit P comprises a resistor R3, a resistor R2, a MOS tube Q1, a voltage stabilizing diode Z2 and a diode D1, wherein the positive output of the second rectifier bridge D5 is connected with the negative pole of the voltage stabilizing diode Z2 and the negative pole of the diode D1 respectively, the positive pole of the voltage stabilizing diode Z2 is connected with the G pole of the MOS tube Q1 through the resistor R3, the G pole of the MOS tube Q1 is connected with the S pole of the MOS tube Q1 through the resistor R2, the S pole of the MOS tube Q1 is connected with the negative output of the second rectifier bridge D5, and the D pole of the MOS tube Q1 is connected with the positive pole of the diode D1; wherein the negative pole of the diode D1 is connected with the No.

[0014] The intelligent control circuit P2 comprises a resistor R45, a resistor R18, a MOS tube Q2, a voltage stabilizing diode Z1 and a diode D2, wherein the positive output of the fourth rectifier bridge D4 is connected with the negative pole of the voltage stabilizing diode Z1 and the negative pole of the diode D2 respectively, the positive pole of the voltage stabilizing diode Z1 is connected with the G pole of the MOS tube Q2 through the resistor R45, the G pole of the MOS tube Q2 is connected with the S pole of the MOS tube Q2 through the resistor R18, the S pole of the MOS tube Q2 is connected with the negative output of the fourth rectifier bridge D4, and the D pole of the MOS tube Q2 is connected with the positive pole of the diode D2; wherein the negative pole of the diode D2 is connected with the No.

[0015] The utility model discloses the beneficial effect lies in:

[0016] 1. When the single plug is connected to the mains: when only the plug A is connected to the mains, the current passes through the protection circuit B, and then passes through the anti-electromagnetic interference circuit C, and enters the rectifier circuit D for rectification. The rectified direct current enters the high-efficiency power conversion circuit W, and after power conversion, it is supplied to the intelligent control circuit P. After the intelligent control circuit P detects that the power supply is stable, the relay K is controlled to be closed, so that the current can flow through the load circuit R, and the power supply for the charging process is provided. At the same time, since the plug A2 is not connected to the mains, the corresponding high-efficiency power conversion circuit W2 and intelligent control circuit P2 have no power input, and the relay K2 remains open state, preventing electric shock caused by current through the plug A2. When only the plug A2 is connected to the mains, the working process is the same as when the plug A is connected, but it involves corresponding components such as B2, C2, D2, W2, P2 and K2.

[0017] 2. Double plug simultaneous access to the power supply: when plug A and plug A2 simultaneously access the power supply, two circuit structures work at the same time. The current path of plug A is the same as when a single plug is accessed, and similarly, the current of plug A2 also passes through its corresponding circuit structure. The high-efficiency power conversion circuits W and W2 in the two circuit structures respectively supply direct current to the intelligent control circuits P and P2. The intelligent control circuits P and P2 respectively control the relays K and K2 to close, so that the current of both circuits can flow through the load circuit R. At this time, the total current in the load circuit R is equal to the sum of the input currents of plug A and plug A2, realizing power multiplication and thus shortening the charging time.

[0018] 3. Throughout the charging process, the protection circuit (B / B2) continuously monitors the current and voltage, and immediately cuts off the circuit to protect the equipment and user safety once abnormal conditions such as short circuit, overcurrent or startup surge are found. The power-down acceleration disconnection and power-up sensing closure mechanism in the intelligent control circuit (P / P2) ensures that the power can be quickly cut off or the circuit can be stably closed in unstable power supply or emergency situations. The relay in the relay (K / K2) provides an additional protection layer to ensure that the circuit can be safely disconnected in the event of circuit failure or abnormal conditions. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a specific circuit diagram of a new energy alternating current mode two double plug power supply input anti-electric shock circuit. DETAILED DESCRIPTION

[0020] Please refer to Figure 1 The utility model relates to a new energy alternating current mode two double plug power supply input anti-electric shock circuit, including first charging circuit, second charging circuit,

[0021] Among them, the first charging circuit includes

[0022] Plug A: it is the ordinary power input L end, power input N end on the market;

[0023] Protection circuit B: integrated with short circuit, overcurrent, anti-startup surge circuit. (Specific circuit fuse F3, thermistor RT2, both are connected in series, and are connected in series on the power input L end)

[0024] Anti-EMI circuit C (EMI): Common-mode filter circuit, bidirectional filter, avoid power supply line introduced high-frequency pulse impact circuit, prevent circuit pollution to the power grid. (Specifically includes safety X capacitor CX2, common-mode inductor L3, safety X capacitor CX3, wherein the two ends of safety X capacitor CX2 are connected with the L end and the N end of the mains input, the input end of common-mode inductor L3 is connected with the L end and the N end of the mains input respectively. The two ends of safety X capacitor CX3 are connected with the two ends of the output end of common-mode inductor L3 respectively, and safety X capacitor CX2 is connected across the L end and the N end of the mains input, forming a high-frequency bypass channel. Because the impedance of the capacitor to the high-frequency signal is very low, it can effectively bypass the high-frequency interference signal to the ground, thereby reducing the impact on the subsequent circuit. The role of common-mode inductor L3: Common-mode inductor L3 is a specially designed inductor, which presents high impedance to common-mode signals (i.e. signals appearing on L and N at the same time) and low impedance to differential-mode signals (i.e. signals appearing between L and N). Therefore, common-mode inductors can effectively suppress common-mode interference signals and prevent them from entering subsequent circuits. When high-frequency interference signals enter the circuit through the mains input line, they will form a common-mode current between the L end and the N end. This common-mode current will pass through the common-mode inductor L3 and generate a reverse magnetic field inside it, thereby canceling each other out and achieving the effect of suppressing common-mode interference. Safety X capacitor CX3 is connected to the output end of common-mode inductor L3, further filtering possible residual high-frequency interference signals. Similarly, the low impedance of the capacitor to high-frequency signals is used to bypass high-frequency interference signals to the ground.

[0025] Rectifier circuit D: Full-bridge rectifier circuit (specific circuit connection: the two ends of safety X capacitor CX3 are connected with the AC input end of first rectifier bridge D6, the positive DC output end of first rectifier bridge D6 is connected with the positive electrode of subsequent R load circuit, and the negative DC output end of first rectifier bridge D6 is connected with subsequent K safety closing and opening circuit).

[0026] Load circuit R: Integrated filter circuit, isolated switch power supply circuit.

[0027] High-performance power conversion circuit W: adopt non-isolated DC-DC, significantly improve the energy conversion efficiency, reduce energy loss, while supporting a wide range of input voltage, adapt to different regional power grid conditions. (The specific circuit includes the second rectifier bridge D5, the capacitor CE2, the power conversion chip U1, the inductor L2, the capacitor CE3, the capacitor C10, the resistor R28, first, the common mode inductor L3 output end is connected with the input end of the second rectifier bridge D5 respectively, wherein one end of the capacitor CE2 is connected with the output positive of the second rectifier bridge D5, the other end is connected with the output negative of the second rectifier bridge D5, at the same time, the output positive of the second rectifier bridge D5 is connected with the DR pin of the power conversion chip U1, the GND pin of the power conversion chip U1 is connected with the output negative of the second rectifier bridge D5, the VOUT pin of the power conversion chip U1 is connected with one end of the inductor L2 and the capacitor CE3, the other end of the capacitor CE3 is connected with the output negative of the second rectifier bridge D5, the other end of the inductor L2 is connected with the IC-GND pin of the power conversion chip U1 respectively, the two ends of the capacitor C10 are connected with the VOUT pin of the power conversion chip U1 and the GND pin of the power conversion chip U1 respectively, the two ends of the resistor R28 are connected with the VOUT pin of the power conversion chip U1 and the GND pin of the power conversion chip U1 respectively)

[0028] The working principle of high-performance power conversion circuit W is mainly based on the DC-DC conversion function of power conversion chip U1, and the specific process is as follows:

[0029] DC input: when the DC output by the rectifier circuit D passes through the protection circuit B, it enters the second rectifier bridge D5 for rectification again (actually mainly filtering effect), and gets relatively smooth DC. After the DC is filtered by the capacitor CE2, it enters the power conversion chip U1. The power conversion chip U1 adjusts the on-off state of its internal switch tube according to the preset voltage conversion ratio and the voltage signal of the feedback network, and converts the input DC into the required output voltage. The converted voltage is smoothed by the LC filter circuit composed of inductor L2 and capacitor CE3, to reduce the ripple in the output voltage. The feedback network composed of capacitor C10 and resistor R28 monitors the output voltage in real time, and feeds back the voltage signal to the power conversion chip U1. The power conversion chip U1 adjusts its working state according to the feedback signal to ensure that the output voltage is stable at the preset value. The stable output voltage is used for the subsequent intelligent control circuit P and load circuit R.

[0030] Intelligent control circuit P: integrated with power-off acceleration disconnection control circuit, power-on stability sensing power stability control closing circuit, reverse electromotive force elimination circuit to ensure stability, intelligent control. (The specific circuit includes resistor R3, resistor R2, MOS tube Q1, voltage stabilizing diode Z2, diode D1, wherein the positive output of the second rectifier bridge D5 is connected with the negative electrode of the voltage stabilizing diode Z2 and the negative electrode of the diode D1 respectively, the positive electrode of the voltage stabilizing diode Z2 is connected with the G pole of the MOS tube Q1 through the resistor R3, the G pole of the MOS tube Q1 is connected with the S pole of the MOS tube Q1 through the resistor R2, and the S pole of the MOS tube Q1 is connected with the output negative pole of the second rectifier bridge D5, and the D pole of the MOS tube Q1 is connected with the positive pole of the diode D1; wherein the negative pole of the diode D1 is connected with the No.1 pin of the relay K, and the positive pole of the diode D1 is connected with the No.3 pin of the relay K)

[0031] The working principle of the intelligent control circuit P is mainly based on the switching characteristics of the MOS tube and the voltage stabilizing characteristics of the voltage stabilizing diode, and the specific process is as follows: when the stable direct current output by the high-efficiency power conversion circuit W is supplied to the P intelligent control circuit, the voltage stabilizing diode Z2 is first used for voltage stabilization. The voltage stabilizing diode Z2 ensures that the voltage input to the gate of the MOS tube Q1 is stable at a preset value, which depends on the voltage stabilizing characteristics of the voltage stabilizing diode Z2. The voltage after voltage stabilization is applied to the gate of the MOS tube Q1 through the resistor R3, and the gate is also connected with the source through the resistor R2, forming a self-bias circuit. When the gate voltage reaches the opening threshold of the MOS tube, the MOS tube Q1 is turned on, and a path is formed between the drain and the source. The conduction state of the MOS tube Q1 is controlled by the gate voltage. When the gate voltage is high enough, the MOS tube is fully turned on, and the drain current reaches the maximum value; when the gate voltage decreases, the MOS tube gradually turns off, and the drain current decreases.

[0032] Relay K control: when the MOS tube Q1 is turned on, the drain current flows to the coil of the relay K through the diode D1, so that the relay K is closed. The closure of the relay K enables the current to flow through the load circuit R, providing power for the charging process. When it is necessary to disconnect the load circuit, the MOS tube Q1 is turned off, the coil of the relay K loses current, the relay K is disconnected, and the current in the load circuit is cut off. The specific circuit includes a relay K, which includes No.1-5 pins, wherein the No.5 pin is grounded, and the No.4 pin is connected with the direct current output negative pole of the first rectifier bridge D6.

[0033] The second charging circuit includes the plug A2: which is the ordinary power input L end and power input N end on the market;

[0034] Protection circuit B2: integrated with short circuit, overcurrent, anti-starting surge circuit. (The specific circuit fuse F4, thermistor RT1, which are connected in series with each other and in series on the power input L end, the principle is similar to the protection circuit B, and therefore it is not repeated here)

[0035] Anti-EMI circuit C2 (EMI): Common-mode filter circuit, bidirectional filter, avoid the power supply line to introduce high-frequency pulse impact circuit, prevent the circuit to pollute the power grid. (Specifically including safety X capacitor CX4, common-mode inductor L6, safety X capacitor CX1, wherein the two ends of the safety X capacitor CX4 are connected with the power input L end and the power input N end, the input end of the common-mode inductor L6 is respectively connected with the power input L end and the power input N end. The two ends of the safety X capacitor CX1 are respectively connected with the two ends of the common-mode inductor L6 output end. The principle is the same as that of the anti-EMI circuit C, so it will not be discussed again)

[0036] Rectifier circuit D2: Full-bridge rectifier circuit (specific circuit connection: the two ends of the safety X capacitor CX1 are connected with the AC input end of the third rectifier bridge D3, the DC output positive end of the third rectifier bridge D3 is connected with the positive electrode of the subsequent R load circuit, and the DC output negative end of the third rectifier bridge D3 is connected with the subsequent K2 safety closing and opening circuit. The principle is the same as that of the rectifier circuit D, so it will not be discussed again).

[0037] High-efficiency power conversion circuit W2: Non-isolated DC-DC is adopted to significantly improve the energy conversion efficiency, reduce energy loss, and at the same time support a wide range of input voltages, adapt to different regional power grid conditions. (Specific circuit includes fourth rectifier bridge D4, capacitor CE1, power conversion chip U2, common-mode inductor L5, capacitor CE4, capacitor C1, and resistor R21. First, the output end of the common-mode inductor L5 is connected with the input end of the fourth rectifier bridge D4, wherein one end of the capacitor CE1 is connected with the output positive electrode of the fourth rectifier bridge D4, and the other end is connected with the output negative electrode of the fourth rectifier bridge D4. At the same time, the output positive electrode of the fourth rectifier bridge D4 is connected with the DR pin of the power conversion chip U2, the GND pin of the power conversion chip U2 is connected with the output negative electrode of the fourth rectifier bridge D4, the VOUT pin of the power conversion chip U2 is connected with one end of the common-mode inductor L5 and the capacitor CE4, the other end of the capacitor CE4 is connected with the output negative electrode of the fourth rectifier bridge D4, the other end of the common-mode inductor L5 is respectively connected with the IC-GND pin of the power conversion chip U2, the two ends of the capacitor C1 are respectively connected with the VOUT pin of the power conversion chip U2 and the GND pin of the power conversion chip U2, and the two ends of the resistor R1 are respectively connected with the VOUT pin of the power conversion chip U2 and the GND pin of the power conversion chip U2. The principle is the same as that of the high-efficiency power conversion circuit W, so it will not be discussed again)

[0038] Intelligent control circuit P2: integrated with power-off acceleration disconnect control circuit, power-on stable sensing power stable control closing circuit, reverse electromotive force elimination circuit to ensure stability, intelligent control. (Specific circuit includes resistance R45, resistance R18, MOS tube Q2, voltage stabilizing diode Z1, diode D2, wherein the positive output of the fourth rectifier bridge D4 is connected with the negative electrode of the voltage stabilizing diode Z1 and the negative electrode of the diode D2 respectively, the positive electrode of the voltage stabilizing diode Z1 is connected with the G pole of the MOS tube Q2 through the resistance R45, the G pole of the MOS tube Q2 is connected with the S pole of the MOS tube Q2 through the resistance R18, at the same time, the S pole of the MOS tube Q2 is connected with the output negative pole of the fourth rectifier bridge D4, and the D pole of the MOS tube Q2 is connected with the positive electrode of the diode D2; wherein the negative electrode of the diode D2 is connected with the No.1 pin of the relay K2, and the positive electrode of the diode D2 is connected with the No.3 pin of the relay K2; the principle is the same as the intelligent control circuit P, so it is not repeated here)

[0039] Relay K2 specific circuit: including relay K2, the relay K includes No.1-5 pins, wherein the No.5 pin is connected with the negative pole of the R load circuit, and the No.4 pin is connected with the direct current output negative pole of the third rectifier bridge D3.

[0040] Specific working principle:

[0041] I. The working process when a single plug is connected to the mains

[0042] Plug A is connected to the mains, and plug A2 is not connected

[0043] Current path: the mains input from the plug A, first passes through the protection circuit B. The protection circuit B includes the fuse F3 and the thermistor RT2, which are connected in series on the mains input L end, for monitoring current and voltage, preventing short circuit, overcurrent and startup surge and other abnormal conditions. The current continues to pass through the anti-electromagnetic interference circuit C. The C circuit is composed of the safety X capacitor CX2, the common mode inductor L3 and the safety X capacitor CX3, which is used to filter out the high-frequency pulse interference introduced in the power supply line. The filtered alternating current enters the rectifier circuit D. The D circuit is a full-bridge rectifier circuit composed of the first rectifier bridge D6, which converts alternating current into direct current. The direct current enters the high-efficiency power supply conversion circuit W. The W circuit includes the second rectifier bridge D5, the capacitor CE2, the power supply conversion chip U1, the inductor L2, the capacitor CE3, the capacitor C10 and the resistance R28. The power supply conversion chip U1 uses DC-DC conversion technology to convert the direct current into the required stable output voltage. The stable direct current supplies the intelligent control circuit P. The P circuit includes the resistance R3, the resistance R2, the MOS tube Q1, the voltage stabilizing diode Z2 and the diode D1. The voltage stabilizing diode Z2 ensures the stability of the voltage input to the gate of the MOS tube Q1, and the MOS tube Q1 controls its conduction and cutoff according to the change of the gate voltage.

[0044] When the MOS tube Q1 is turned on, the drain current flows through the diode D1 to the coil of the relay K, so that the relay K is closed. The closure of the relay K enables the current to flow through the load circuit R, providing power for the charging process. Handling of the unconnected plug A2: Since the plug A2 is not connected to the mains, the corresponding W2 high-performance power conversion circuit and P2 intelligent control circuit have no power input, and the relay K2 remains open state, preventing electric shock caused by current through the plug A2.

[0045] When the plug A is connected to the mains and the plug A2 is not connected to the mains, the A mains current flows through B and then through C to D and W (the 1st pin of W has an electric input, and W uses a non-isolated DC-DC step-down output that can be DC12V or D24V or DC5V to give P intelligent control K closure K5th pin and 4th pin communication), the main current enters D from the 1st pin of D and flows out to the 1st pin of R, which inputs the 2nd pin of R and outputs to the 5th pin of K, then through the 4th pin of D, and then returns to the circuit. The 1st pin of W has no electric input, and P2 intelligent control K2 is open K2 5th pin and 4th pin, so the current cannot flow from K2 5th pin through 4th pin to D2 to A2 IN-L2 and IN-N2, which cannot cause electric shock.

[0046] Plug A2 is connected to the mains, and plug A is not connected

[0047] The working process is similar to when the plug A is connected, but it involves B2, C2, D2, W2, P2, and K2, etc. corresponding circuit components. When the plug A2 is connected to the mains and the plug A is not connected to the mains, the A2 mains current flows through B2 and then through C2 to D2 and W2 (the 1st pin of W2 has an electric input, and W2 uses a non-isolated DC-DC step-down output that can be DC12V or D24V or DC5V to give P intelligent control K2 closure K2 5th pin and 4th pin communication), the main current enters D2 from the 1st pin of D2 and flows out to the 1st pin of R, which inputs the 2nd pin of R and outputs to the 5th pin of K2, then through the 4th pin of D, and then returns to the circuit. The 1st pin of W has no electric input, and P2 intelligent control K2 is open K2 5th pin and 4th pin, so the current cannot flow from K2 5th pin through 4th pin to D2 to A2 IN-L2 and IN-N2, which cannot cause electric shock.

[0048] II. Working process when both plugs are connected to the mains

[0049] Plug A and plug A2 are connected to the power supply at the same time: two circuit structures (plug A corresponding circuit and plug A2 corresponding circuit) work at the same time. The current path of plug A is the same as when single plug is connected, and the current of plug A2 also passes through its corresponding circuit structure. The high-efficiency power conversion circuits W and W2 in the two circuit structures respectively supply direct current to the intelligent control circuits P and P2. The intelligent control circuits P and P2 respectively control the relays K and K2 to close, so that the current of the two circuits can flow through the load circuit R. At this time, the total current in the load circuit R is equal to the sum of the input currents of plug A and plug A2, realizing power multiplication, thereby shortening the charging time.

[0050] When A is connected to the power supply, A2 is connected to the power supply, A power flows through B and then flows through C to D and W (the 1st pin of W has an electric input, W uses a non-isolated DC-DC step-down output, which can be DC12V or D24V or DC5V to P intelligent control K closed K5th pin and 4th pin communication), A group current flows through B and then flows through C to D, D1st pin flows out to R1st pin input R2nd pin output to K5th pin through 4th pin and then through D4th pin loop. A2 power flows through B2 and then flows through C2 to D2 and W2 (the 1st pin of W2 has an electric input, W2 uses a non-isolated DC-DC step-down output, which can be DC12V or D24V or DC5V to P intelligent control K2 closed K2 5th pin and 4th pin communication), A2 group current flows through B2 and then flows through C2 to D2, D2 1st pin flows out to R1st pin input R2nd pin output to K2 5th pin through 4th pin and then through D4th pin loop. The total current flowing through R is equal to the sum of A group current and A2 group current, and the charging interval is equal to the demand of vehicle battery kW divided by charging kW, and the charging kW is equal to the total current of R multiplied by voltage, because the total current of R is equal to the sum of A group current and A2 group current, so the charging time is shortened by 1 times.

[0051] During the entire charging process, the protection circuit (B / B2) continuously monitors the current and voltage, and immediately cuts off the circuit to protect the equipment and users in case of abnormal conditions such as short circuit, overcurrent or startup surge. The power-on and off sensing power stable control closing mechanism in the intelligent control circuit (P / P2) ensures that the power can be quickly cut off or the circuit can be stably closed in case of unstable power supply or emergency. The relays (K / K2) provide an additional protection layer to ensure that the circuit can be safely disconnected in case of circuit failure or abnormal conditions. Through the description of the above working process and circuit principle, it can be seen that the power system realizes an efficient, safe and intelligent electric vehicle charging solution by integrating advanced protection, conversion and control technologies.

[0052] The beneficial effect of the overall scheme is that by the double plug design, it allows simultaneous access to two power sources, so that the total current flowing through the load circuit is equal to the sum of the two plug input currents, realizing power multiplication. The power boost directly shortens the charging time, which means faster charging speed and higher use efficiency for electric vehicle users.

[0053] Multiple protection mechanisms are integrated in the circuit system, including protection circuits, intelligent control circuits, and relay controls, effectively preventing abnormal situations such as short circuits, overcurrents, and startup surges. When either plug is not connected to the mains, the corresponding power conversion circuit and intelligent control circuit have no power input, and the relay remains open, ensuring that current will not pass through the unconnected plug to cause electric shock risk. The intelligent control circuit can sense power stability and quickly cut off power in unstable or emergency situations, further ensuring the safety of users and equipment.

[0054] The double plug design provides more flexible charging methods, allowing users to choose single plug or double plug charging according to actual conditions, meeting the needs of different scenarios. The shortening of charging time improves user convenience, making electric vehicles more suitable for daily travel and long-distance travel. The stability and reliability of the power system ensure the smooth progress of the charging process, reducing user anxiety and inconvenience due to charging problems.

[0055] The above embodiments only describe the preferred embodiments of the utility model, and do not limit the scope of the utility model. Without departing from the design spirit of the utility model, various modifications and improvements to the technical solutions of the utility model made by ordinary engineering and technical personnel in the field shall fall within the protection scope determined by the claims of the utility model.

Claims

1. A novel dual-plug power input circuit for AC power mode two, characterized in that: It includes a first charging circuit, a second charging circuit, and a load circuit R. The output terminals of the first charging circuit and the second charging circuit are both connected to the load circuit R. The first charging circuit includes a plug A, a protection circuit B, an anti-electromagnetic interference circuit C, a rectifier circuit D, a high-efficiency power conversion circuit W, an intelligent control circuit P, and a relay K. The second charging circuit includes plug A2, protection circuit B2, anti-electromagnetic interference circuit C2, rectifier circuit D2, high-efficiency power conversion circuit W2, intelligent control circuit P2, and relay K2; When the input terminal of the first charging circuit is connected to the mains power, the current passes through the protection circuit B and the anti-electromagnetic interference circuit C and enters the rectifier circuit D for rectification. The rectified DC power enters the high-efficiency power conversion circuit W and is supplied to the intelligent control circuit P after power conversion. The intelligent control circuit P controls the corresponding relay K to close so that the current flows through the load circuit R. When the input terminal of the second charging circuit is connected to the mains power, the current passes through the protection circuit B2 and the anti-electromagnetic interference circuit C2 and enters the rectifier circuit D2 for rectification. The rectified DC power enters the high-efficiency power conversion circuit W2. After power conversion, it is supplied to the intelligent control circuit P2. The intelligent control circuit P2 controls the corresponding relay K2 to close, so that the current flows through the load circuit R.

2. The novel dual-plug power input anti-electric shock circuit for AC power mode two according to claim 1, characterized in that: The protection circuit B includes a fuse F3 and a thermistor RT2, which are connected in series with each other at the input L terminal of plug A.

3. The novel dual-plug power input anti-electric shock circuit for AC power mode two according to claim 2, characterized in that: The protection circuit B2 includes a circuit fuse F4 and a thermistor RT1, which are connected in series with each other at the input L terminal of plug A2.

4. The novel dual-plug power input anti-electric shock circuit for AC power mode two according to claim 3, characterized in that: The electromagnetic interference suppression circuit C includes a safety X capacitor CX2, a common mode inductor L3, and a safety X capacitor CX3. The two ends of the safety X capacitor CX2 are connected to the mains input L terminal and the mains input N terminal. The input terminal of the common mode inductor L3 is connected to the mains input L terminal and the mains input N terminal respectively. The two ends of the safety X capacitor CX3 are connected to the two ends of the output terminal of the common mode inductor L3 respectively.

5. The novel dual-plug power input anti-electric shock circuit for AC power mode two according to claim 4, characterized in that: The electromagnetic interference suppression circuit C2 includes a safety X capacitor CX4, a common mode inductor L6, and a safety X capacitor CX1. The two ends of the safety X capacitor CX4 are connected to the mains input L terminal and the mains input N terminal. The input terminal of the common mode inductor L6 is connected to the mains input L terminal and the mains input N terminal respectively. The two ends of the safety X capacitor CX1 are connected to the two ends of the output terminal of the common mode inductor L6 respectively.

6. The novel dual-plug power input anti-electric shock circuit for AC power mode two according to claim 5, characterized in that: The rectifier circuit D includes a first rectifier bridge D6. The two ends of the safety capacitor CX3 are connected to the AC input terminal of the first rectifier bridge D6. The positive terminal of the DC output of the first rectifier bridge D6 is connected to the positive terminal of the subsequent load circuit R. The negative terminal of the DC output of the first rectifier bridge D6 is connected to the relay K.

7. A novel dual-plug power input anti-electric shock circuit for AC power input in claim 6, characterized in that: The rectifier circuit D2 includes a third rectifier bridge D3. The two ends of the safety capacitor X CX1 are connected to the AC input terminal of the third rectifier bridge D3. The positive terminal of the DC output of the third rectifier bridge D3 is connected to the positive terminal of the subsequent R load circuit. The negative terminal of the DC output of the third rectifier bridge D3 is connected to the relay K2 circuit.

8. A novel dual-plug power input anti-electric shock circuit for AC power input in claim 7, characterized in that: The high-efficiency power conversion circuit W includes a second rectifier bridge D5, capacitor CE2, power conversion chip U1, inductor L2, capacitor CE3, capacitor C10, and resistor R28. The output terminal of the common-mode inductor L3 is connected to the input terminal of the second rectifier bridge D5. One end of capacitor CE2 is connected to the positive output terminal of the second rectifier bridge D5, and the other end is connected to the negative output terminal of the second rectifier bridge D5. Simultaneously, the positive output terminal of the second rectifier bridge D5 is connected to the DR pin of the power conversion chip U1, and the GND pin of the power conversion chip U1 is connected to the input terminal of the second rectifier bridge D5. With the output negative terminal connected, the VOUT pin of the power conversion chip U1 is connected to one end of the inductor L2 and the capacitor CE3. The other end of the capacitor CE3 is connected to the output negative terminal of the second rectifier bridge D5. The other end of the inductor L2 is connected to the IC-GND pin of the power conversion chip U1. The two ends of the capacitor C10 are connected to the VOUT pin and the GND pin of the power conversion chip U1, respectively. The two ends of the resistor R28 are connected to the VOUT pin and the GND pin of the power conversion chip U1, respectively.

9. A novel dual-plug power input anti-electric shock circuit for AC power input in claim 8, characterized in that: The high-efficiency power conversion circuit W2 includes a fourth rectifier bridge D4, capacitor CE1, power conversion chip U2, common-mode inductor L5, capacitor CE4, capacitor C1, and resistor R21. First, the output of the common-mode inductor L5 is connected to the input of the fourth rectifier bridge D4. One end of capacitor CE1 is connected to the positive output of the fourth rectifier bridge D4, and the other end is connected to the negative output of the fourth rectifier bridge D4. Simultaneously, the positive output of the fourth rectifier bridge D4 is connected to the DR pin of the power conversion chip U2, and the GND pin of the power conversion chip U2 is connected to the negative output of the fourth rectifier bridge D4. The VOUT pin of the power conversion chip U2 is connected to one end of the common-mode inductor L5 and capacitor CE4. The other end of capacitor CE4 is connected to the negative output of the fourth rectifier bridge D4. The other end of the common-mode inductor L5 is connected to the I pin of the power conversion chip U2. The C-GND pins are connected, and the two ends of capacitor C1 are connected to the VOUT pin and the GND pin of power conversion chip U2, respectively. The two ends of resistor R1 are connected to the VOUT pin and the GND pin of power conversion chip U2, respectively.

10. A novel dual-plug power input anti-electric shock circuit for AC power input in claim 9, characterized in that: The intelligent control circuit P includes resistors R3 and R2, MOSFET Q1, Zener diode Z2, and diode D1. The positive output of the second rectifier bridge D5 is connected to the negative terminals of both Zener diode Z2 and diode D1. The positive terminal of Zener diode Z2 is connected to the gate (G) of MOSFET Q1 through resistor R3. The gate (G) of MOSFET Q1 is connected to the source (S) of MOSFET Q1 through resistor R2. Simultaneously, the source (S) of MOSFET Q1 is connected to the negative output of the second rectifier bridge D5. The drain (D) of MOSFET Q1 is connected to the positive terminal of diode D1. The negative terminal of diode D1 is connected to pin 1 of relay K, and the positive terminal of diode D1 is connected to pin 3 of relay K. The intelligent control circuit P2 includes resistors R45 and R18, MOSFET Q2, Zener diode Z1, and diode D2. The positive output of the fourth rectifier bridge D4 is connected to the negative terminals of Zener diode Z1 and D2, respectively. The positive terminal of Zener diode Z1 is connected to the gate (G) of MOSFET Q2 through resistor R45. The gate (G) of MOSFET Q2 is connected to the source (S) of MOSFET Q2 through resistor R18. Simultaneously, the source (S) of MOSFET Q2 is connected to the negative output of the fourth rectifier bridge D4, and the drain (D) of MOSFET Q2 is connected to the positive terminal of diode D2. The negative terminal of diode D2 is connected to pin 1 of relay K2, and the positive terminal of diode D2 is connected to pin 3 of relay K2.

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