Alternating current charging pile based on wide voltage power supply
Through the combination of protection circuit and step-down circuit, an AC charging pile with a wide voltage range is realized, which solves the problem of voltage adaptation in different regions, improves the adaptability and stability of the charging pile, and supports multiple voltage outputs.
Patent Information
- Application Number
- CN202422640687.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-10-30
AI Technical Summary
Existing AC charging piles cannot adapt to changes in grid voltage in different regions, resulting in the need for voltage adaptation, which increases cost and complexity.
It adopts protection circuit, step-down circuit and DC-DC step-down module, and realizes voltage conversion in a wide voltage range through the combination of power management chip and other components. It supports DC24V, DC12V, DC6.5V and DC5.5V output and controls the on and off of the contactor.
It achieves voltage adaptability in different regions, improves the versatility and stability of charging piles, suppresses common-mode interference, protects circuit components, and improves signal quality.
Smart Images
Figure CN223391121U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of charging piles, and in particular to an AC charging pile based on a wide voltage power supply. Background Art
[0002] With the increasing popularity of electric vehicles, the demand for charging infrastructure is also growing. Most current AC charging stations operate only within a specific voltage range and cannot adapt to voltage variations in different regional power grids. This requires different voltage adaptations when installing and using charging stations in different regions, increasing cost and complexity. Therefore, there is an urgent need for AC charging stations that can accommodate a wide voltage range to improve their versatility and adaptability. Utility Model Content
[0003] In order to improve the problem of different voltage adaptation required when installing and using charging piles in different regions, the present application provides an AC charging pile based on wide voltage power supply.
[0004] This application provides an AC charging pile based on a wide voltage power supply, which adopts the following technical solutions:
[0005] An AC charging pile based on wide voltage power supply, comprising:
[0006] The protection circuit receives input from one phase L1-N of the three-phase power supply and converts the AC voltage into DC24V voltage for output;
[0007] A step-down circuit receives the output of the protection circuit and converts it into a DC12V voltage for output;
[0008] A DC-DC step-down module receives the output of the step-down circuit and converts it into other required DC voltages for output;
[0009] The contactor control circuit receives the DC12V voltage input and controls the on and off of the DC24V output circuit.
[0010] By adopting the above technical solution, the contactor is powered by DC24V voltage and the power supply to the contactor is controlled by DC12V. The protection circuit supports a wide voltage range input, which can support a wide range of voltage input so that it can be used in different regions, thereby improving the versatility and adaptability of the charging pile.
[0011] Optionally, the protection circuit includes a power management chip PM1, and the first pin AC(N) end and the second pin AC(L) end of the power management chip PM1 receive the input of a single-phase power supply L1-N, and output a DC24V voltage in parallel through the third pin V0+ and the fourth pin V0+ of the power management chip PM1 as a +24V power supply.
[0012] By adopting the above technical solution, the input voltage is converted into a DC24V voltage through the power management chip PM1.
[0013] Optionally, the protection circuit further includes a varistor RV1 and a capacitor C1, and the varistor RV1 and the capacitor C1 are connected in parallel between the L1 terminal and the N terminal of a single-phase power input.
[0014] By adopting the above technical solution, overvoltage protection and surge voltage suppression are achieved through the varistor RV1, thereby protecting the components in the circuit. Filtering is achieved through the capacitor C1, thereby improving circuit stability.
[0015] Optionally, the protection circuit further includes a fuse F1, which is connected in series to the L1 end of a single-phase power input.
[0016] By adopting the above technical solution, overload protection is achieved through the fuse F1, which plays a protective role on the circuit.
[0017] Optionally, the protection circuit also includes a common-mode inductor L1, the third pin and the first pin of the common-mode inductor L1 are coupled to the input of a single-phase power supply L1-N, and the second pin and the fourth pin of the common-mode inductor L1 are coupled to the first pin AC(N) and the second pin AC(L) of the power management chip PM1.
[0018] By adopting the above technical solution, common-mode interference is suppressed by the common-mode inductor L1, circuit components are protected, signal quality is improved, and circuit stability is enhanced.
[0019] Optionally, the step-down circuit includes a power management chip PM2 and a diode D100, the positive electrode of the diode D100 receives the DC24V voltage output by the protection circuit, the negative electrode of the diode D100 is coupled to the first pin Vin end of the power management chip PM2, and the third pin Vo+ of the power management chip PM2 outputs a DC12V voltage as a +12V power supply.
[0020] By adopting the above technical solution, the current direction is determined by the diode D100 to prevent reverse flow, and the DC24V voltage is converted into a DC12V voltage output through the power management chip PM2.
[0021] Optionally, the DC-DC step-down module includes a step-down chip U1, a capacitor C8, a resistor R6 and a resistor R7. The seventh pin VIN of the step-down chip U1 receives the DC12V voltage output by the step-down circuit. The capacitor C8 is connected in parallel between the first pin SW and the eighth pin BST of the step-down chip U1. The resistor R6 is connected in parallel between the fourth pin FB and the first pin SW of the step-down chip U1. The fourth pin FB of the step-down chip U1 is grounded through the resistor R7. The first pin SW of the step-down chip U1 outputs a DC6.5V voltage as a +6.5V power supply.
[0022] By adopting the above technical solution, the DC12V voltage is further stepped down by the step-down chip U1, and then the final DC6.5V voltage output is achieved through rectification, filtering and voltage division by capacitors and resistors.
[0023] Optionally, the DC-DC buck module further includes a common-mode inductor L2 and a voltage regulator D2. The common-mode inductor L2 is connected in series to the fourth pin FB of the buck chip U1. The fourth pin FB of the buck chip U1 is grounded through the voltage regulator D2.
[0024] By adopting the above technical solution, the common-mode inductor L2 is used to protect the circuit and improve stability, and the voltage regulator diode D2 is used to protect the circuit and filter and stabilize the voltage.
[0025] Optionally, the DC-DC step-down module further includes a transistor Q4, a resistor R8, and a fuse F2. The collector of the transistor Q4 is coupled to the first pin SW end of the step-down chip U1, the collector of the transistor Q4 is coupled to the base of the transistor Q4 through the resistor R8, and the emitter of the transistor Q4 outputs a DC5.5V voltage as a +5.5V power supply through the fuse F2.
[0026] By adopting the above technical solution, DC6.5V is converted into DC5.5V output through transistor Q4, resistor and capacitor.
[0027] Optionally, the contactor control circuit includes a relay K1, a transistor Q2, and a socket strip P2, the base of the transistor Q2 receives the RELAY CTRL signal control, the emitter of the transistor Q2 is grounded, the third pin and the fourth pin of the relay K1 are connected in series between the collector of the transistor Q2 and the +12V power supply, the first pin and the second pin of the relay K1 are connected in series between the second pin of the socket strip P2 and the +24V power supply, and the third pin of the socket strip P2 outputs a CONTACTOR F OUT signal to control the contactor.
[0028] By adopting the above technical solution, the on-off of transistor Q2 is controlled by the RELAY CTRL signal, thereby controlling whether the third and fourth pins of relay K1 receive +12V power supply, thereby controlling whether the socket P2 outputs the corresponding CONTACTOR F OUT signal to control the contactor.
[0029] In summary, this application includes at least one of the following beneficial technical effects:
[0030] 1. It can support a wide range of voltage input to enable use in different regions, improving the versatility and adaptability of charging piles.
[0031] 2. Suppress common-mode interference, protect circuit components, improve signal quality, and enhance circuit stability. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] Figure 1 This is a circuit diagram of an AC charging pile based on a wide voltage power supply in an embodiment of the present application.
[0033] Figure 2 yes Figure 1 Enlarged schematic diagram of point A in the middle.
[0034] Figure 3 yes Figure 1 Enlarged schematic diagram of point B in the middle.
[0035] Figure 4 It is a circuit diagram of the contactor control circuit.
[0036] Explanation of the accompanying symbols: 1. Protection circuit; 2. Buck circuit; 3. DC-DC buck module; 4. Contactor control circuit. DETAILED DESCRIPTION
[0037] The following is combined with Figure 1-4 This application is described in further detail.
[0038] The embodiment of the present application discloses an AC charging pile based on a wide voltage power supply. Figure 1 and Figure 2The AC charging pile based on wide voltage power supply includes a protection circuit 1, a step-down circuit 2, a DC-DC step-down module 3, and a contactor control circuit 4. The protection circuit 1 includes a power management chip PM1, a varistor RV1, a fuse F1, a capacitor C1, a common-mode inductor L1, a capacitor C2, and a capacitor C3. The fuse F1 is connected in series between the third pin of the common-mode inductor L1 and the L1 end of a single-phase power supply. The first pin of the common-mode inductor L1 is electrically connected to the N end of the single-phase power supply. The varistor RV1 and the capacitor C1 are connected in parallel between the first and third pins of the common-mode inductor L1. The second pin of the common-mode inductor L1 is electrically connected to the first pin AC(N) of the power management chip PM1, the fourth pin of the common-mode inductor L1 is electrically connected to the second pin AC(L) of the power management chip PM1, one end of the capacitor C2 is connected in parallel to the fourth pin of the common-mode inductor L1, the other end of the capacitor C2 is electrically connected to one end of the capacitor C3, the other end of the capacitor C3 is connected in parallel to the second pin of the common-mode inductor L1, a transformer is connected in parallel between the capacitors C2 and C3, and the other end of the transformer is electrically connected to the first pin AC(N) of the power management chip PM1.
[0039] Reference Figure 2 The step-down circuit 2 includes a power management chip PM2, a diode D100, an electrolytic capacitor C106, a capacitor C107, a capacitor C103, a capacitor C104, a capacitor C4, and a capacitor C4. The third pin V0+ and the fourth pin V0+ of the power management chip PM1 are connected in parallel to the positive electrode of the diode D100, and the negative electrode of the diode D100 is electrically connected to the first pin Vin of the power management chip PM2. The fifth pin GND and the sixth pin GND of the power management chip PM1 are connected in parallel to the ground terminal GND. The positive electrode of the electrolytic capacitor C106 and one end of the capacitor C107 are both connected in parallel to the positive electrode of the diode D100, and the negative electrode of the electrolytic capacitor C106 and the other end of the capacitor C107 are both connected in parallel to the ground terminal GND. The positive electrode of the diode D100 serves as a +24V power supply end to output a DC24V voltage. The second pin GND of the power management chip PM2 is grounded, and capacitors C104, C4, and C5 are connected in parallel between the second pin GND and the third pin +Vo of the power management chip PM2. The third pin +Vo of the power management chip PM2 serves as a +12V power supply end to output a DC12V voltage.
[0040] Reference Figure 2 and Figure 3The DC-DC step-down module 3 includes a step-down chip U1, a capacitor C6, a capacitor C7, a resistor R4, a capacitor C8, a capacitor C9, a resistor R5, a voltage regulator D2, a common-mode inductor L2, a capacitor C10, a capacitor C11, a resistor R6, a resistor R7, a capacitor C12, a resistor R8, a capacitor C13, a transistor Q4, a capacitor C14, and a fuse F2. The seventh pin VIN of the step-down chip U1 is electrically connected to the third pin +Vo of the power management chip PM2. One end of the sixth capacitor C6 and one end of the seventh capacitor C7 are connected in parallel to the seventh pin VIN of the step-down chip U1. The other end of the sixth capacitor C6 and the other end of the seventh capacitor C7 are grounded. The sixth pin FREG of the step-down chip U1 is grounded through the resistor R4. The fifth pin GND of the step-down chip U1 is grounded. The capacitor C9 and the resistor R5 are connected in series between the third pin CMP of the step-down chip U1 and the ground GND. The common-mode inductor L2 It is connected in series between the first pin SW of the buck chip U1 and the collector of the transistor Q4. One end of capacitor C8 is electrically connected to the eighth pin BST of the buck chip U1. The other end of capacitor C8 is electrically connected between the first pin SW of the buck chip U1 and the common-mode inductor L2. The negative electrode of the Zener diode D2 is connected in parallel between the first pin SW of the buck chip U1 and the common-mode inductor L2. One end of capacitor C10, one end of capacitor C11, and one end of resistor R6 are connected in parallel between the common-mode inductor L2 and the collector of the transistor Q4. The other ends of capacitor C10, the other ends of capacitor C11, and the positive electrode of the Zener diode D2 are grounded. Resistor R7 is connected in series between the other end of resistor R6 and the ground terminal GND. The fourth pin FB of the buck chip U1 is connected in parallel between resistors R6 and R7. A +6.5V terminal, which serves as a DC 6.5V voltage output, is electrically connected between the parallel position of capacitor C11 and the collector of the transistor Q4. Resistor R8 is connected in parallel between the collector and base of transistor Q4. One end of capacitor C12 is connected in parallel to the collector of transistor Q4, and the other end of capacitor C12 is grounded. One end of capacitor C13 is connected in parallel between resistor R8 and the base of transistor Q4, and the other end of capacitor C13 is grounded. Capacitor C14 is connected in series between the emitter of transistor Q4 and ground terminal GND. The connection between capacitor C14 and the emitter of transistor Q4 serves as the +5.5V_F terminal for a DC5.5V voltage output. One end of fuse F2 is connected in parallel between the emitter of transistor Q4 and capacitor C14. The other end of fuse F2 serves as the +5.5V (5.4V-5.8V) terminal for a DC5.4V-5.8V voltage output.
[0041] Reference Figure 2 and Figure 3 and Figure 4The contactor control circuit includes relay K1, transistor Q2, socket P2, resistor R44, resistor R54, capacitor C45, diode D10, +12V power supply and +24V power supply. Resistor R54 is connected in series to the base of transistor Q2. RELAY The CTRL signal enters the base of transistor Q2 through resistor R54. One end of resistor R44 is connected in parallel between resistor R54 and the base of transistor Q2. The other end of resistor R44 is grounded. The emitter of transistor Q2 is grounded. The cathode of diode D10 is electrically connected to the +12V power supply. The anode of diode D10 is electrically connected to the collector of transistor Q2. The third and fourth pins of relay K1 are energized coil terminals. The first and second pins of relay K1 are switch terminals. One end of capacitor C45 is connected in parallel with the third pin of relay K1 between the +12V power supply and the cathode of diode D10. The other end of capacitor C45 is grounded. The fourth pin of relay K1 is connected in parallel with the anode of diode D10. The second pin of relay K1 is electrically connected to the +24V power supply. The first pin of relay K1 is electrically connected to the second pin of socket strip P2. The first pin of socket strip P2 is grounded. The third pin of socket strip P2 outputs CONTACTOR F The OUT signal is used to control the contactor. A test point TP6 is provided between the first pin of the relay K1 and the second pin of the socket P2.
[0042] The implementation principle of an AC charging pile based on wide voltage power supply in the embodiment of the present application is as follows: when working, firstly, through the three-phase power input, one phase power supply L1-N is used to power the charging pile main control board and the contactor, through the fuse F1, common mode inductor L1, varistor RV1, capacitor C1, capacitor C2, capacitor C3, and then through the power management chip PM1 to convert the AC voltage into DC24V voltage, and then through the power management chip P2M to convert the 24V DC voltage into DC12V voltage, and then through the step-down chip Chip U1, common-mode inductor L2, capacitor C10, capacitor C11, and voltage regulator diode D2 convert the DC12V voltage into a DC6.5V voltage, and then convert the DC6.5V voltage into a DC+5.5V voltage through capacitor C12, resistor R8, capacitor C13, transistor Q4, and capacitor C14; the above-mentioned DC12V voltage is used for the contactor control circuit 4 to control the contactor K1 to be closed or disconnected, so that the output DC24V is used for the contactor to be closed. Whether the contactor is closed determines whether the charging pile can charge normally.
[0043] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.
Claims
1. An AC charging pile based on wide voltage power supply, characterized in that: include: The protection circuit (1) receives input from one phase power supply L1-N of the three-phase power supply and converts the AC voltage into a DC24V voltage for output; A step-down circuit (2) receives the output of the protection circuit (1), converts it into a DC12V voltage and then outputs it; A DC-DC step-down module (3) receives the output of the step-down circuit (2), converts it into other required DC voltages and outputs it; The contactor control circuit (4) receives the input of DC12V voltage and controls the on and off of the DC24V output circuit.
2. The AC charging pile based on wide voltage power supply according to claim 1, characterized in that: The protection circuit (1) includes a power management chip PM1, wherein the first pin AC(N) and the second pin AC(L) of the power management chip PM1 receive input of a single-phase power supply L1-N, and output a DC24V voltage as a +24V power supply via the third pin V0+ and the fourth pin V0+ of the power management chip PM1 in parallel.
3. The AC charging pile based on wide voltage power supply according to claim 1, characterized in that: The protection circuit (1) further comprises a varistor RV1 and a capacitor C1, wherein the varistor RV1 and the capacitor C1 are connected in parallel between the L1 terminal and the N terminal of a single-phase power input.
4. The AC charging pile based on wide voltage power supply according to claim 1, characterized in that: The protection circuit (1) further comprises a fuse F1, which is connected in series to the L1 end of a single-phase power input.
5. The AC charging pile based on wide voltage power supply according to claim 2, characterized in that: The protection circuit (1) further comprises a common-mode inductor L1, wherein the third pin and the first pin of the common-mode inductor L1 are coupled to the input of a single-phase power supply L1-N, and the second pin and the fourth pin of the common-mode inductor L1 are coupled to the first pin AC(N) and the second pin AC(L) of the power management chip PM1.
6. The AC charging pile based on wide voltage power supply according to claim 1, characterized in that: The step-down circuit (2) includes a power management chip PM2 and a diode D100, wherein the anode of the diode D100 receives the DC24V voltage output by the protection circuit (1), the cathode of the diode D100 is coupled to the first pin Vin of the power management chip PM2, and the third pin Vo+ of the power management chip PM2 outputs a DC12V voltage as a +12V power supply.
7. The AC charging pile based on wide voltage power supply according to claim 1, characterized in that: The DC-DC buck module (3) comprises a buck chip U1, a capacitor C8, a resistor R6 and a resistor R7. The seventh pin VIN of the buck chip U1 receives the DC12V voltage output by the buck circuit (2). The capacitor C8 is connected in parallel between the first pin SW and the eighth pin BST of the buck chip U1. The resistor R6 is connected in parallel between the fourth pin FB and the first pin SW of the buck chip U1. The fourth pin FB of the buck chip U1 is grounded through the resistor R7. The first pin SW of the buck chip U1 outputs a DC6.5V voltage as a +6.5V power supply.
8. The AC charging pile based on wide voltage power supply according to claim 7, characterized in that: The DC-DC step-down module (3) further comprises a common-mode inductor L2 and a voltage regulator D2. The common-mode inductor L2 is connected in series to the fourth pin FB end of the step-down chip U1. The fourth pin FB end of the step-down chip U1 is grounded via the voltage regulator D2.
9. The AC charging pile based on wide voltage power supply according to claim 7, characterized in that: The DC-DC step-down module (3) further comprises a transistor Q4, a resistor R8, and a fuse F2. The collector of the transistor Q4 is coupled to the first pin SW of the step-down chip U1. The collector of the transistor Q4 is coupled to the base of the transistor Q4 through the resistor R8. The emitter of the transistor Q4 outputs a DC5.5V voltage as a +5.5V power supply through the fuse F2.
10. The AC charging pile based on wide voltage power supply according to claim 1, characterized in that: The contactor control circuit (4) includes a relay K1, a transistor Q2, and a socket P2. The base of the transistor Q2 receives a RELAY CTRL signal for control, the emitter of the transistor Q2 is grounded, the third pin and the fourth pin of the relay K1 are connected in series between the collector of the transistor Q2 and the +12V power supply, the first pin and the second pin of the relay K1 are connected in series between the second pin of the socket P2 and the +24V power supply, and the third pin of the socket P2 outputs a CONTACTOR F OUT signal to control the contactor.