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

Abstract

The invention 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 end of the first charging circuit and the output end of 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 invention relates to the field of charging circuits, in particular to a new energy AC mode dual-plug power input anti-electric shock circuit. Background Art

[0002] With the rapid development of the electric vehicle industry, the demand for charging infrastructure has increased dramatically. Mode 2 charging, which is the way to charge electric vehicles using household AC power, has been widely welcomed for its convenience and economy. In the current field of electric vehicle charging technology, 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, the long waiting time for charging seriously affects the efficiency and convenience of the vehicle. Some charging systems lack a complete protection mechanism in design, such as short-circuit protection, overcurrent protection, and power-on surge protection, which can easily cause safety accidents during the charging process. At the same time, for charging systems with multiple plug designs, if the plug that is not connected to the mains is not handled properly, there may be a risk of electric shock, posing a threat to the user's life safety. Summary of the invention

[0003] To solve the above problems, the present invention provides a new energy AC mode two-dual plug power input anti-electric shock circuit, which integrates multiple protection mechanisms to ensure the safe and reliable charging process; flexibly meet the charging needs of users in different scenarios and improve user experience.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: a new energy AC mode two dual-plug power input anti-electric shock circuit, including 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, wherein 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 input end of the first charging circuit is connected to the mains, 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.

[0007] When the input end of the second charging circuit is connected to the mains, 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 and is supplied to the intelligent control circuit P2 after power conversion. The intelligent control circuit P2 controls the corresponding relay K2 to close so that the current flows through the load circuit R.

[0008] Further, the protection circuit B includes a fuse F3 and a thermistor 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 thermistor 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 respectively connected to the mains input L end and the mains input N end, and the two ends of the safety X capacitor CX3 are respectively connected to the two ends of the output end 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 respectively connected to the mains input L end and the mains input N end, and the two ends of the safety X capacitor CX1 are respectively connected to the two ends of the output end of the common mode inductor L6.

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

[0011] Further, the high-efficiency power conversion circuit W includes a second rectifier bridge D5, a capacitor CE2, a power conversion chip U1, an inductor L2, a capacitor CE3, a capacitor C10, and a resistor R28. The output ends of the common-mode inductor L3 are respectively connected to the input ends of the second rectifier bridge D5, wherein one end of the capacitor CE2 is connected to the output positive electrode of the second rectifier bridge D5, and the other end is connected to the output negative electrode of the second rectifier bridge D5. At the same time, the output positive electrode 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 output negative electrode of the second rectifier bridge D5. The VOUT pin of the power conversion chip U1 is connected to one end of the inductor L2 and the capacitor CE3, and the other end of the capacitor CE3 is connected to the output negative electrode of the second rectifier bridge D5. The other end of the inductor L2 is respectively connected to the I pin of the power conversion chip U1. The two ends of the capacitor C10 are respectively connected to the VOUT pin of the power conversion chip U1 and the GND pin of the power conversion chip U1, and the two ends of the resistor R28 are respectively connected to the VOUT pin of the power conversion chip U1 and the GND pin of the power conversion chip U1.

[0012] Furthermore, the high-efficiency power conversion circuit W2 includes 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 respectively connected to the input end of the fourth rectifier bridge D4, wherein one end of the capacitor CE1 is connected to the output positive electrode of the fourth rectifier bridge D4, and the other end is connected to 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 to the DR pin of the power conversion chip U2, the GND pin of the power conversion chip U2 is connected to the output negative electrode 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, the other end of the capacitor CE4 is connected to the output negative electrode of the fourth rectifier bridge D4, and the other end of the common-mode inductor L5 is respectively connected to the I The two ends of the capacitor C1 are respectively connected to 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 to the VOUT pin of the power conversion chip U2 and the GND pin of the power conversion chip U2.

[0013] Further, the intelligent control circuit P includes a resistor R3, a resistor R2, a MOS tube Q1, a voltage regulator diode Z2, and a diode D1, wherein the output positive electrode of the second rectifier bridge D5 is connected to the negative electrode of the voltage regulator diode Z2 and the negative electrode of the diode D1 respectively, the positive electrode of the voltage regulator diode Z2 is connected to the G electrode of the MOS tube Q1 through the resistor R3, the G electrode of the MOS tube Q1 is connected to the S electrode of the MOS tube Q1 through the resistor R2, and the S electrode of the MOS tube Q1 is connected to the output negative electrode of the second rectifier bridge D5, and the D electrode of the MOS tube Q1 is connected to the positive electrode of the diode D1; wherein the negative electrode of the diode D1 is connected to the pin No. 1 of the relay K, and the positive electrode of the diode D1 is connected to the pin No. 3 of the relay K;

[0014] The intelligent control circuit P2 includes a resistor R45, a resistor R18, a MOS tube Q2, a voltage regulator diode Z1, and a diode D2, wherein the output positive electrode of the fourth rectifier bridge D4 is connected to the negative electrode of the voltage regulator diode Z1 and the negative electrode of the diode D2 respectively, the positive electrode of the voltage regulator diode Z1 is connected to the G electrode of the MOS tube Q2 through the resistor R45, the G electrode of the MOS tube Q2 is connected to the S electrode of the MOS tube Q2 through the resistor R18, and the S electrode of the MOS tube Q2 is connected to the output negative electrode of the fourth rectifier bridge D4, and the D electrode of the MOS tube Q2 is connected to the positive electrode of the diode D2; wherein the negative electrode of the diode D2 is connected to the No. 1 pin of the relay K2, and the positive electrode of the diode D2 is connected to the No. 3 pin of the relay K2.

[0015] The beneficial effects of the present invention are:

[0016] 1. When a single plug is connected to the mains: When only plug A is connected to the mains, the current passes through the protection circuit B, then through 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. After the intelligent control circuit P detects that the power supply is stable, it controls the relay K to close, so that the current can flow through the load circuit R to provide power for the charging process. At the same time, since plug A2 is not connected to the mains, the corresponding high-efficiency power conversion circuit W2 and the intelligent control circuit P2 have no power input, and the relay K2 remains disconnected to prevent the current from passing through plug A2 and causing electric shock. When only plug A2 is connected to the mains, the working process is the same as when plug A is connected, but the corresponding components such as B2, C2, D2, W2, P2 and K2 are involved.

[0017] 2. When two plugs are connected to the mains at the same time: When plug A and plug A2 are connected to the mains at the same time, the two circuit structures work at the same time. The current path of plug A is the same as when a single plug is connected. 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 supply DC power to the intelligent control circuits P and P2 respectively. The intelligent control circuits P and P2 control the closure of relays K and K2 respectively, 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, achieving power doubling, thereby shortening the charging time.

[0018] 3. During the entire charging process, the protection circuit (B / B2) continuously monitors the current and voltage. Once an abnormal situation such as short circuit, overcurrent or power-on surge is detected, the circuit is immediately cut off to protect the safety of the device and the user. The power-off accelerated disconnection and power-on sensing closing mechanism in the intelligent control circuit (P / P2) ensure that the power can be quickly cut off or the circuit can be stably closed in case of unstable power or emergency. The relay in the relay (K / K2) provides an additional layer of protection to ensure that the circuit can be safely disconnected in case of circuit failure or abnormality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a specific circuit diagram of a new type of energy AC mode dual-plug power input anti-electric shock circuit. DETAILED DESCRIPTION

[0020] See also Figure 1 As shown, the present invention relates to a novel energy AC mode dual-plug power input anti-electric shock circuit, comprising a first charging circuit, a second charging circuit,

[0021] The first charging circuit includes

[0022] Plug A: It is the common L-terminal and N-terminal of AC input in the market;

[0023] Protection circuit B: integrated with short circuit, overcurrent, and startup surge protection circuits. (Specific circuit fuse F3 and thermistor RT2 are connected in series and in series with the mains input L terminal)

[0024] Anti-electromagnetic interference circuit C (EM I): common mode filter circuit, two-way filtering, avoid the introduction of high-frequency pulses into the power supply line of the power grid to affect the circuit, and prevent the circuit from polluting the power grid. (Specifically including safety X capacitor CX2, common mode inductor L3, safety X capacitor CX3, where the two ends of the safety X capacitor CX2 are connected to the mains input L end and the mains input N end, and the input end of the common mode inductor L3 is connected to the mains input L end and the mains input N end respectively. The two ends of the safety X capacitor CX3 are respectively connected to the two ends of the output end of the common mode inductor L3, and the safety X capacitor CX2 is connected across the mains input L end and N end to form a high-frequency bypass channel. Since the capacitor has a very low impedance to high-frequency signals, it can effectively bypass high-frequency interference signals to the ground, thereby reducing the impact on subsequent circuits. The role of the common mode inductor L3: The common mode inductor L3 is a specially designed inductor that has a high impedance to common mode signals. The common-mode inductor (i.e., the signal that appears at both the L and N terminals at the same time) presents high impedance, while the differential-mode signal (i.e., the signal that appears between the L and N terminals) presents low impedance. Therefore, the common-mode inductor can effectively suppress the common-mode interference signal and prevent it from entering the subsequent circuit. When high-frequency interference signals enter the circuit through the AC input line, they will form a common-mode current between the L and N terminals. 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. The safety X capacitor CX3 is connected to the output end of the common-mode inductor L3 to further filter out the high-frequency interference signals that may remain. Similarly, the low impedance characteristics of the capacitor to high-frequency signals are used to bypass the high-frequency interference signal to the ground.

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

[0026] Load circuit R: integrated with filter circuit and isolation switch power supply circuit.

[0027] High-efficiency power conversion circuit W: adopts non-isolated DC-DC, significantly improves energy conversion efficiency, reduces energy loss, and supports a wide range of input voltages to adapt to grid conditions in different regions. (The specific circuit includes the second rectifier bridge D5, capacitor CE2, power conversion chip U1, inductor L2, capacitor CE3, capacitor C10, and resistor R28. First, the output ends of the common-mode inductor L3 are respectively connected to the input ends of the second rectifier bridge D5, wherein one end of the capacitor CE2 is connected to the output positive electrode of the second rectifier bridge D5, and the other end is connected to the output negative electrode of the second rectifier bridge D5. At the same time, the output positive electrode 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 output negative electrode of the second rectifier bridge D5. The VOUT pin of the power conversion chip U1 is connected to one end of the inductor L2 and the capacitor CE3, and the other end of the capacitor CE3 is connected to the output negative electrode of the second rectifier bridge D5. The other end of the inductor L2 is respectively connected to the I The two ends of capacitor C10 are connected to the VOUT pin of power conversion chip U1 and the GND pin of power conversion chip U1 respectively, and the two ends of resistor R28 are connected to the VOUT pin of power conversion chip U1 and the GND pin of power conversion chip U1 respectively)

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

[0029] DC input: After the DC output from the rectifier circuit D passes through the protection circuit B, it enters the second rectifier bridge D5 for further rectification (actually mainly filtering) to obtain a smoother DC power. After being filtered by capacitor CE2, the DC power enters the power conversion chip U1. The power conversion chip U1 adjusts the on-off state of its internal switch tube according to the internal preset voltage conversion ratio and the voltage signal of the feedback network, and converts the input DC power 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 stabilized output voltage is supplied to the subsequent intelligent control circuit P and load circuit R for use.

[0030] Intelligent control circuit P: integrated with power-off acceleration disconnection control circuit, power-on stable sensing power supply stable control closed circuit, and reverse electromotive force elimination circuit to ensure stability and intelligent control. (The specific circuit includes resistor R3, resistor R2, MOS tube Q1, voltage regulator diode Z2, and diode D1, wherein the output positive pole of the second rectifier bridge D5 is connected to the negative pole of the voltage regulator diode Z2 and the negative pole of the diode D1 respectively, the positive pole of the voltage regulator diode Z2 is connected to the G pole of the MOS tube Q1 through the resistor R3, the G pole of the MOS tube Q1 is connected to the S pole of the MOS tube Q1 through the resistor R2, and at the same time, the S pole of the MOS tube Q1 is connected to the output negative pole of the second rectifier bridge D5, and the D pole of the MOS tube Q1 is connected to the positive pole of the diode D1; wherein the negative pole of the diode D1 is connected to the No. 1 pin of the relay K, and the positive pole of the diode D1 is connected to 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. The specific process is as follows: When the stable DC power output by the high-efficiency power conversion circuit W is supplied to the P intelligent control circuit, it is first stabilized by the voltage stabilizing diode Z2. 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 stabilized voltage is applied to the gate of the MOS tube Q1 through the resistor R3, and the gate is also connected to the source through the resistor R2 to form a self-bias circuit. When the gate voltage reaches the turn-on 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 is gradually turned 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 closing of the relay K allows the current to flow through the load circuit R, providing power for the charging process. When the load circuit needs to be disconnected, the MOS tube Q1 is turned off, the coil of the relay K loses current, and the relay K is disconnected, cutting off the current in the load circuit. Specific circuit: including relay K, relay K includes pins 1-5, wherein pin 5 is grounded, and pin 4 is connected to the negative terminal of the DC output of the first rectifier bridge D6).

[0033] The second charging circuit includes a plug A2: a common AC input L terminal and a AC input N terminal on the market;

[0034] Protection circuit B2: integrated with short circuit, overcurrent, and startup surge protection circuits. (Specific circuit fuse F4 and thermistor RT1 are connected in series with each other and in series with the mains input L terminal. The principle is similar to protection circuit B, so I will not elaborate on it.)

[0035] Anti-electromagnetic interference circuit C2 (EM I): common mode filtering circuit, bidirectional filtering, avoiding the introduction of high-frequency pulses into the power supply line of the power grid to affect the circuit, and preventing the circuit from polluting the power grid. (Specifically including safety X capacitor CX4, common mode inductor L6, safety X capacitor CX1, where the two ends of the safety X capacitor CX4 are connected to the mains input L terminal and the mains input N terminal, and the input end 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 end of the common mode inductor L6 respectively. The principle is similar to that of the anti-electromagnetic interference circuit C, so it will not be discussed in detail)

[0036] Rectifier circuit D2: full-bridge rectifier circuit (specific circuit connection: the two ends of the safety X capacitor CX1 are connected to the AC input end of the third rectifier bridge D3, the DC output positive terminal of the third rectifier bridge D3 is connected to the positive pole of the subsequent R load circuit, and the DC output negative terminal of the third rectifier bridge D3 is connected to the subsequent K2 safety closing and disconnecting circuit. The principle is similar to the rectifier circuit D, so it will not be discussed in detail).

[0037] High-efficiency power conversion circuit W2: uses non-isolated DC-DC, significantly improves energy conversion efficiency, reduces energy loss, and supports a wide range of input voltages to adapt to grid conditions in different regions. (The specific circuit includes the fourth rectifier bridge D4, capacitor CE1, power conversion chip U2, common-mode inductor L5, capacitor CE4, capacitor C1, and resistor R21. First, the output ends of the common-mode inductor L5 are respectively connected to the input ends of the fourth rectifier bridge D4, wherein one end of the capacitor CE1 is connected to the output positive electrode of the fourth rectifier bridge D4, and the other end is connected to 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 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 electrode 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, and the other end of the capacitor CE4 is connected to the output negative electrode of the fourth rectifier bridge D4. The other end of the common-mode inductor L5 is respectively connected to the I The two ends of the capacitor C1 are connected to the VOUT pin of the power conversion chip U2 and the GND pin of the power conversion chip U2 respectively, and the two ends of the resistor R1 are connected to the VOUT pin of the power conversion chip U2 and the GND pin of the power conversion chip U2 respectively; the principle is similar to the high-efficiency power conversion circuit W, so it will not be elaborated)

[0038] Intelligent control circuit P2: integrated with power-off acceleration disconnection control circuit, power-on stable sensing power supply stable control closed circuit, and reverse electromotive force elimination circuit to ensure stability and intelligent control. (The specific circuit includes resistor R45, resistor R18, MOS tube Q2, voltage regulator diode Z1, and diode D2, wherein the output positive pole of the fourth rectifier bridge D4 is connected to the negative pole of the voltage regulator diode Z1 and the negative pole of the diode D2 respectively, the positive pole of the voltage regulator diode Z1 is connected to the G pole of the MOS tube Q2 through the resistor R45, the G pole of the MOS tube Q2 is connected to the S pole of the MOS tube Q2 through the resistor R18, and at the same time, the S pole of the MOS tube Q2 is connected to the output negative pole of the fourth rectifier bridge D4, and the D pole of the MOS tube Q2 is connected to the positive pole of the diode D2; wherein the negative pole of the diode D2 is connected to the No. 1 pin of the relay K2, and the positive pole of the diode D2 is connected to the No. 3 pin of the relay K2; the principle is similar to that of the intelligent control circuit P, so it will not be elaborated)

[0039] Specific circuit of relay K2: including relay K2, relay K includes pins 1-5, wherein pin 5 is connected to the negative pole of the R load circuit, and pin 4 is connected to the negative terminal of the DC output of the third rectifier bridge D3).

[0040] Specific working principle:

[0041] 1. Workflow when a single plug is connected to the mains

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

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

[0044] When MOS tube Q1 is turned on, the drain current flows to the coil of relay K through diode D1, closing relay K. The closing of relay K allows current to flow through load circuit R, providing power for the charging process. Processing when plug A2 is not connected: Since plug A2 is not connected to the mains, the corresponding W2 high-efficiency power conversion circuit and P2 intelligent control circuit have no power input, and relay K2 remains disconnected to prevent current from passing through plug A2 and causing electric shock.

[0045] When A is connected to the mains and A2 is not connected to the mains, the mains current from A flows through B and then through C to D and W (pin 1 of W has power input, W uses non-isolated DC-DC step-down output but DC12V or D24V or DC5V to P intelligent control K closes K and connects pin 5 with pin 4), the main current flows into D from pin 1 of D to pin 1 of R, inputs pin 2 of R, outputs to pin 5 of K, passes through pin 4 and then loops through pin 4 of D. A2 is not connected to the mains, pin 1 of W2 has no power input, P2 intelligent control K2 disconnects pin 5 and pin 4 of K2, current cannot flow from pin 5 of K2 through pin 4 to D2 and to I N-L2 and I N-N2 of A2 without power and cannot cause electric shock.

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

[0047] The working process is similar to that when plug A is connected, but it involves corresponding circuit components such as B2, C2, D2, W2, P2 and K2. When A2 is connected to the mains and A is not connected to the mains, the claim is: A2 mains current flows through B2 and then through C2 to D2 and W2 (pin 1 of W2 has power input, W2 uses non-isolated DC-DC step-down output but DC12V or D24V or DC5V to P intelligent control K2 to close K2 pin 5 and pin 4), the main current enters D2, flows out from D2 pin 1, flows to R pin 1, inputs R pin 2, outputs to K2 pin 5, passes through pin 4, and then loops through D pin 4. A is not connected to the mains, W pin 1 has no power input, P2 intelligent control K disconnects K pin 5 and pin 4, the current cannot flow from K pin 5 through pin 4 to D to A's I N-L2 and I N-N2 without power and cannot cause electric shock.

[0048] 2. Workflow when two plugs are connected to the mains at the same time

[0049] Plug A and plug A2 are connected to the mains at the same time: two circuit structures (the circuit corresponding to plug A and the circuit corresponding to plug A2) work at the same time. The current path of plug A is the same as when a 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 supply DC power to the intelligent control circuits P and P2 respectively. The intelligent control circuits P and P2 control the relays K and K2 to close respectively, so that the currents 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, achieving power doubling, thereby shortening the charging time.

[0050] A is connected to the mains, A2 is connected to the mains, A's mains current flows through B and then flows through C to D and W (W's pin 1 has power input, W uses non-isolated DC-DC step-down output, but it can be DC12V or D24V or DC5V to P intelligent control K closed K's 5th pin and 4th pin connected), A group current flows through B and then flows through C to D, D's 1st pin flows out to R's 1st pin input R's 2nd pin output to K's 5th pin through 4th pin and then through D's 4th pin loop. A2's mains current flows through B2 and then flows through C2 to D2 and W2 (W2's pin 1 has power input, W2 uses non-isolated DC-DC step-down output, but it can be DC12V or D24V or DC5V to P intelligent control K2 closed K2's 5th pin and 4th pin connected), A2 group current flows through B2 and then flows through C2 to D2, D2's 1st pin flows out to R's 1st pin input R's 2nd pin output to K2's 5th pin through 4th pin and then through D's 4th pin loop. The total current flowing through R = current of group A + current of group A2, charging interval = vehicle battery demand kW / charging kW, and charging kW = total current of R multiplied by voltage. Because the total current of R = current of group A + current of group A2, the charging time is shortened by 1 time.

[0051] During the entire charging process, the protection circuit (B / B2) continuously monitors the current and voltage. Once an abnormal situation such as short circuit, overcurrent or power-on surge is detected, the circuit is immediately cut off to protect the safety of the equipment and users. The power-off accelerated disconnection and power-on stable sensing power supply stable control closing mechanism in the intelligent control circuit (P / P2) ensure that the power can be quickly cut off or the circuit can be stably closed in case of unstable power or emergency. The relay (K / K2) provides an additional layer of protection to ensure that the circuit can be safely disconnected in the event of circuit failure or abnormality. Through the description of the above workflow and circuit principles, it can be seen that the power system has achieved an efficient, safe and intelligent electric vehicle charging solution by integrating advanced protection, conversion and control technologies.

[0052] The beneficial effect of the overall solution is that the dual-plug design allows two power sources to be connected at the same time, so that the total current flowing through the load circuit is equal to the sum of the input currents of the two plugs, achieving power doubling. The increase in power directly shortens the charging time, which means faster charging speed and higher efficiency for electric vehicle users.

[0053] Multiple protection mechanisms are integrated into the circuit system, including protection circuit, intelligent control circuit and relay control, which effectively prevent abnormal situations such as short circuit, overcurrent and power-on surge. When any plug is not connected to the mains, the corresponding power conversion circuit and intelligent control circuit have no power input, and the relay remains disconnected to ensure that the current does not pass through the unconnected plug and cause the risk of electric shock. The intelligent control circuit can sense the stability of the power supply and quickly cut off the power supply in case of unstable power supply or emergency, further ensuring the safety of users and equipment.

[0054] The dual-plug design provides a more flexible charging method. Users can choose to charge with a single plug or dual plugs according to actual conditions, meeting the needs of different scenarios. The shortened charging time improves the user's convenience, making electric vehicles more suitable for daily travel and long-distance travel. The stability and reliability of the power system ensure the smooth charging process and reduce the anxiety and inconvenience caused by charging problems.

[0055] The above implementation modes are merely descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering and technical personnel in the field shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A new energy AC mode dual-plug power input anti-electric shock circuit, characterized by: It 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. 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; When the input end of the first charging circuit is connected to the mains, 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 end of the second charging circuit is connected to the mains, 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 and is supplied to the intelligent control circuit P2 after power conversion. The intelligent control circuit P2 controls the corresponding relay K2 to close so that the current flows through the load circuit R.

2. According to claim 1, a new energy AC mode two-dual plug power input anti-electric shock circuit is characterized by: The protection circuit B includes a fuse F3 and a thermistor RT2, which are connected in series to the input L terminal of the plug A.

3. According to claim 2, a new energy AC mode two-dual plug power input anti-electric shock circuit is characterized by: The protection circuit B2 includes a circuit fuse F4 and a thermistor RT1, which are connected in series to the input L terminal of the plug A2.

4. According to claim 3, a new energy AC mode two-dual plug power input anti-electric shock circuit is characterized by: The anti-electromagnetic interference circuit C includes a safety X capacitor CX2, a common mode inductor L3, and a safety X capacitor CX3, wherein 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 respectively connected to the mains input L end and the mains input N end, and two ends of the safety X capacitor CX3 are respectively connected to two ends of the output end of the common mode inductor L3.

5. According to claim 4, a new energy AC mode two-dual plug power input anti-electric shock circuit is characterized by: The anti-electromagnetic interference circuit C2 includes a safety X capacitor CX4, a common mode inductor L6, and a safety X capacitor CX1, wherein 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 respectively connected to the mains input L end and the mains input N end, and two ends of the safety X capacitor CX1 are respectively connected to two ends of the output end of the common mode inductor L6.

6. According to claim 5, a new energy AC mode two-dual plug power input anti-electric shock circuit is characterized by: The rectifier circuit D includes a first rectifier bridge D6, two ends of the safety X capacitor CX3 are connected to the AC input end of the first rectifier bridge D6, the DC output positive end of the first rectifier bridge D6 is connected to the positive electrode of the subsequent R load circuit, and the DC output negative end of the first rectifier bridge D6 is connected to the relay K.

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

8. According to claim 7, a new energy AC mode two-dual plug power input anti-electric shock circuit is characterized by: The high-efficiency power conversion circuit W includes a second rectifier bridge D5, a capacitor CE2, a power conversion chip U1, an inductor L2, a capacitor CE3, a capacitor C10, and a resistor R28. The output ends of the common-mode inductor L3 are respectively connected to the input ends of the second rectifier bridge D5, wherein one end of the capacitor CE2 is connected to the output positive electrode of the second rectifier bridge D5, and the other end is connected to the output negative electrode of the second rectifier bridge D5. At the same time, the output positive electrode 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 GND pin of the second rectifier bridge D5. The output negative electrode is 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 electrode of the second rectifier bridge D5, the other end of the inductor L2 is respectively connected to the IC-GND pin of the power conversion chip U1, the two ends of the capacitor C10 are respectively connected to the VOUT pin of the power conversion chip U1 and the GND pin of the power conversion chip U1, and the two ends of the resistor R28 are respectively connected to the VOUT pin of the power conversion chip U1 and the GND pin of the power conversion chip U1.

9. According to claim 8, a new energy AC mode two-dual plug power input anti-electric shock circuit, characterized in that: The high-efficiency power conversion circuit W2 includes 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 respectively connected to the input end of the fourth rectifier bridge D4, wherein one end of the capacitor CE1 is connected to the output positive electrode of the fourth rectifier bridge D4, and the other end is connected to 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 to the DR pin of the power conversion chip U2, the GND pin of the power conversion chip U2 is connected to the output negative electrode 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, the other end of the capacitor CE4 is connected to the output negative electrode of the fourth rectifier bridge D4, and the other end of the common-mode inductor L5 is respectively connected to the I The two ends of the capacitor C1 are respectively connected to 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 to the VOUT pin of the power conversion chip U2 and the GND pin of the power conversion chip U2.

10. A new type of energy source AC mode two dual plug power input anti-electric shock circuit according to claim 9, characterized in that: The intelligent control circuit P includes a resistor R3, a resistor R2, a MOS tube Q1, a voltage regulator diode Z2, and a diode D1, wherein the output positive electrode of the second rectifier bridge D5 is connected to the negative electrode of the voltage regulator diode Z2 and the negative electrode of the diode D1 respectively, the positive electrode of the voltage regulator diode Z2 is connected to the G electrode of the MOS tube Q1 through the resistor R3, the G electrode of the MOS tube Q1 is connected to the S electrode of the MOS tube Q1 through the resistor R2, and the S electrode of the MOS tube Q1 is connected to the output negative electrode of the second rectifier bridge D5, and the D electrode of the MOS tube Q1 is connected to the positive electrode of the diode D1; wherein the negative electrode of the diode D1 is connected to the No. 1 pin of the relay K, and the positive electrode of the diode D1 is connected to the No. 3 pin of the relay K; The intelligent control circuit P2 includes a resistor R45, a resistor R18, a MOS tube Q2, a voltage regulator diode Z1, and a diode D2, wherein the output positive electrode of the fourth rectifier bridge D4 is connected to the negative electrode of the voltage regulator diode Z1 and the negative electrode of the diode D2 respectively, the positive electrode of the voltage regulator diode Z1 is connected to the G electrode of the MOS tube Q2 through the resistor R45, the G electrode of the MOS tube Q2 is connected to the S electrode of the MOS tube Q2 through the resistor R18, and the S electrode of the MOS tube Q2 is connected to the output negative electrode of the fourth rectifier bridge D4, and the D electrode of the MOS tube Q2 is connected to the positive electrode of the diode D2; wherein the negative electrode of the diode D2 is connected to the No. 1 pin of the relay K2, and the positive electrode of the diode D2 is connected to the No. 3 pin of the relay K2.

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