Voltage conversion circuit of charging pile

Abstract

The utility model discloses a voltage conversion circuit of a charging pile, which relates to the technical field of charging piles, and comprises a power supply control module used for controlling the transmission state of electric energy and carrying out voltage reduction, rectification filtering and voltage stabilization processing on alternating current electric energy; the power supply conversion module is used for performing rectification, inversion and voltage transformation processing on the alternating current electric energy; the charging pile mode switching module is used for switching an electric energy path input to the charging gun module; the charging gun module is used for directly transmitting the received second electric energy to the connected electric vehicle, rectifying the second electric energy and transmitting the rectified electric energy to the connected electric vehicle; the power supply type detection module is used for performing alternating current judgment on the output electric energy; and the power supply state detection module is used for detecting whether the provided electric energy is normal. The voltage conversion circuit of the charging pile can detect whether the electric energy input into the charging gun module is normal or not, and when the electric energy is abnormal, the power supply control module is controlled to be powered off, so that the power supply safety of the charging pile is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of charging piles, in particular to a voltage conversion circuit of a charging pile. Background Art

[0002] A charging pile refers to a charging device that provides energy supplement for electric vehicles. Its input end is directly connected to the AC power grid, and its output end is equipped with a charging plug for charging electric vehicles. With the popularity of electric vehicles, the efficiency of charging piles has received more and more attention. Since one part of electric vehicles supports DC charging and the other part supports AC charging, the charging piles in the prior art generally have the functions of AC power supply and DC power supply, and are selected and controlled according to the charging type required by the user. However, when switching between AC and DC charging, a relay switch is required to switch the power supply. If the relay switch works for a long time, it is easy to fail to switch the power supply normally, resulting in abnormal power supply and subsequent damage to the electric vehicle. Therefore, there is room for improvement. Summary of the invention

[0003] The embodiment of the utility model provides a voltage conversion circuit for a charging pile to solve the problems raised in the above background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A voltage conversion circuit for a charging pile, comprising: a power control module, a power conversion module, a charging pile mode switching module, a charging gun module, a power type detection module and a power supply status detection module;

[0006] a power control module connected to the power conversion module and the power supply status detection module, used to receive AC power and transmit the AC power to the power conversion module, perform voltage reduction, rectification, filtering and voltage stabilization on the AC power and output the first power, and stop transmitting the AC power to the power conversion module when receiving the first control signal and the second control signal output by the power supply status detection module;

[0007] A power conversion module, used for rectifying, inverting and transforming the AC power and outputting the second power;

[0008] A charging pile mode switching module, connected to the power control module, the power conversion module and the charging gun module, configured to receive the first electric energy and provide a first switching signal, and transmit the second electric energy to the charging gun module;

[0009] A charging gun module, used to directly transmit the received second electric energy to the connected electric vehicle, rectify the second electric energy and transmit the rectified electric energy to the connected electric vehicle;

[0010] a power type detection module, connected to the charging gun module and the power control module, configured to receive the second electric energy and detect the second electric energy input to the charging gun module or the electric energy rectified by the charging gun module, and output a first level signal when the electric energy output by the charging gun module is direct current electric energy, and output a second level signal when the electric energy output by the charging gun module is alternating current electric energy;

[0011] The power supply status detection module is connected to the power type detection module and the charging pile mode switching module, and is used to output a first control signal when a first switching signal and a first level signal are received, and output a second control signal when the first switching signal is not received and a second level signal is received.

[0012] As a further solution of the utility model: the power control module includes a power interface, a first transformer, a first relay switch, a first rectifier, a second capacitor, a first diode, a second resistor, a first relay and a first switch tube;

[0013] Preferably, the first end of the power interface is connected to the first moving end of the first relay switch and the first end of the primary side of the first transformer, the second end of the power interface is connected to the second moving end of the first relay switch and the second end of the primary side of the second transformer, the first end and the second end of the secondary side of the first transformer are respectively connected to the first end and the second end of the first rectifier, the third end of the first rectifier is connected to one end of the second capacitor and the cathode of the first diode and is connected to one end of the first relay through the second resistor, the other end of the first relay is connected to the collector of the first switch tube, the emitter of the first switch tube, the anode of the first diode, the other end of the second capacitor and the fourth end of the first rectifier are all grounded, the base of the first switch tube is connected to the power supply status detection module, and the first static end and the second static end of the first relay switch are connected to the power conversion module.

[0014] As a further solution of the utility model: the power conversion module includes a second rectifier, a first inverter and a second transformer; the charging pile mode switching module includes a second relay switch and a third relay switch; the charging gun module includes a third rectifier and a charging gun interface;

[0015] Preferably, the first end and the second end of the second rectifier are respectively connected to the first static end and the second static end of the first relay switch, the third end and the fourth end of the second rectifier are respectively connected to the first end and the second end of the first inverter, the third end and the fourth end of the first inverter are respectively connected to the first end of the primary side of the second transformer and the second end of the primary side of the second transformer, the first end of the secondary side of the second transformer is connected to the first moving end of the second relay switch and the first static end of the third relay switch, the second end of the secondary side of the second transformer is connected to the second moving end of the second relay switch and the second static end of the third relay switch, the first static end and the second static end of the second relay switch are respectively connected to the first end and the second end of the third rectifier, the third end of the third rectifier is connected to the first end of the charging gun interface and the first moving end of the third relay switch, and the fourth end of the third rectifier is connected to the second end of the charging gun interface and the second moving end of the third relay switch.

[0016] As a further solution of the utility model: the power type detection module includes a third resistor, a first capacitor, a first resistor and a first optical coupler;

[0017] Preferably, the third end of the first optocoupler is connected to the fourth end of the first rectifier through the third resistor, the fourth end of the first optocoupler is grounded, the first end of the first optocoupler is connected to the first end of the charging gun interface through the first resistor, and the second end of the first optocoupler is connected to the second end of the charging gun interface through the first capacitor.

[0018] As a further solution of the utility model: the power supply status detection module includes a first logic chip and a second logic chip;

[0019] Preferably, the B end of the first logic chip and the B end of the second logic chip are both connected to the third end of the first optocoupler, the A end of the first logic chip and the A end of the second logic chip are connected to the charging pile mode switching module, and the F end of the first logic chip is connected to the F end of the second logic chip and the base of the first switching tube.

[0020] As a further solution of the utility model: the charging pile mode switching module also includes a fourth resistor, a fifth resistor, a first key switch, a sixth resistor, a second switch tube and a second relay;

[0021] Preferably, one end of the second relay is connected to one end of the fifth resistor and to the third end of the first rectifier through the fourth resistor, the other end of the fifth resistor is connected to the moving end of the first key switch, the other end of the second relay is connected to the collector of the second switch tube, the base of the second switch tube is connected to one end of the sixth resistor, the static end of the first key switch, the F end of the first logic chip and the other F end of the second logic chip, and the emitter of the second switch tube is connected to the other end of the sixth resistor, the fourth end of the first rectifier and the ground end.

[0022] Compared with the prior art, the beneficial effects of the utility model are as follows: the voltage conversion circuit of the charging pile of the utility model is implemented by the power conversion module to rectify, invert and transform the electric energy provided by the power control module, and the power transmission path is switched through the charging pile mode switching module, so that the charging gun module can rectify the input electric energy or directly receive the electric energy to provide AC power or DC power, and the output electric energy type is detected through the power type detection module, and the charging pile mode switching module and the power supply status detection module are cooperated to determine whether the electric energy input to the charging gun module is normal, and when the electric energy is abnormal, the power control module is controlled to cut off the power, thereby improving the power supply safety of the charging pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic block diagram of a voltage conversion circuit for a charging pile provided in an example of the utility model.

[0025] Figure 2 A circuit diagram of a voltage conversion circuit for a charging pile provided in an example of the utility model.

[0026] Figure 3 This is a connection circuit diagram of the charging pile mode switching module provided in an example of the utility model. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In one embodiment, see Figure 1 , a voltage conversion circuit of a charging pile, comprising: a power control module 1, a power conversion module 2, a charging pile mode switching module 3, a charging gun module 4, a power type detection module 5 and a power supply status detection module 6;

[0029] Specifically, the power control module 1 is connected to the power conversion module 2 and the power supply status detection module 6, and is used to receive the AC power and transmit the AC power to the power conversion module 2, perform voltage reduction, rectification, filtering and voltage stabilization on the AC power and output the first power, and when receiving the first control signal and the second control signal output by the power supply status detection module 6, stop transmitting the AC power to the power conversion module 2;

[0030] The power conversion module 2 is used to rectify, invert and transform the AC power and output the second power;

[0031] The charging pile mode switching module 3 is connected to the power control module 1, the power conversion module 2 and the charging gun module 4, and is used to receive the first electric energy and provide a first switching signal, and transmit the second electric energy to the charging gun module 4;

[0032] The charging gun module 4 is used to directly transmit the received second electric energy to the connected electric vehicle, rectify the second electric energy and transmit the rectified electric energy to the connected electric vehicle;

[0033] a power type detection module 5, connected to the charging gun module 4 and the power control module 1, for receiving the second electric energy and detecting the second electric energy input to the charging gun module 4 or the electric energy rectified by the charging gun module 4, and outputting a first level signal when the electric energy output by the charging gun module 4 is DC electric energy, and outputting a second level signal when the electric energy output by the charging gun module 4 is AC electric energy;

[0034] The power supply status detection module 6 is connected to the power type detection module 5 and the charging pile mode switching module 3, and is used to output a first control signal when a first switching signal and a first level signal are received, and output a second control signal when the first switching signal is not received and a second level signal is received.

[0035] In a specific embodiment, the power control module 1 may adopt a power control circuit composed of a power interface, a transformer, a relay, a rectifier, etc., which can realize the transmission control of electric energy, the voltage reduction, rectification filtering and voltage stabilization control of electric energy; the power conversion module 2 may adopt a power conversion circuit composed of a rectifier, an inverter and a transformer, which can rectify, invert and transform the input AC electric energy; the charging pile mode switching module 3 may adopt a charging pile mode switching circuit composed of a key switch, a relay, a triode, etc., which can realize the switching of DC electric energy and AC electric energy by the charging gun module 4 by controlling the transmission path of electric energy; the charging gun module 4 A charging gun circuit consisting of a charging gun interface and a rectifier can be used to connect to an electric vehicle. It can rectify the input electrical energy and provide DC power to the electric vehicle, or it can directly receive AC power and provide AC power to the electric vehicle. The above-mentioned power type detection module 5 can use a power type detection circuit composed of a photocoupler, a capacitor and a resistor, which can detect whether the electrical energy output by the charging gun module 4 is AC power. The above-mentioned power supply status detection module 6 can use a power supply status detection circuit composed of a logic chip, which can determine whether the required power supply voltage is consistent with the voltage provided by the charging gun module 4. If they are inconsistent, the power supply control module 1 is controlled to perform power-off protection.

[0036] In another embodiment, see Figure 1 , Figure 2 and Figure 3 The power control module 1 includes a power interface, a first transformer B1, a first relay switch K1-1, a first rectifier T1, a second capacitor C2, a first diode D1, a second resistor R2, a first relay K1 and a first switch tube V1;

[0037] Specifically, the first end of the power interface is connected to the first moving end of the first relay switch K1-1 and the first end of the primary side of the first transformer B1, the second end of the power interface is connected to the second moving end of the first relay switch K1-1 and the second end of the primary side of the second transformer B2, the first end and the second end of the secondary side of the first transformer B1 are respectively connected to the first end and the second end of the first rectifier T1, the third end of the first rectifier T1 is connected to one end of the second capacitor C2 and the cathode of the first diode D1 and connected to one end of the first relay K1 through the second resistor R2, the other end of the first relay K1 is connected to the collector of the first switch tube V1, the emitter of the first switch tube V1, the anode of the first diode D1, the other end of the second capacitor C2 and the fourth end of the first rectifier T1 are all grounded, the base of the first switch tube V1 is connected to the power supply status detection module 6, and the first static end and the second static end of the first relay switch K1-1 are connected to the power conversion module 2.

[0038] In a specific embodiment, the first relay switch K1-1 may be a normally closed double-pole double-throw switch, and the first relay K1 may be controlled to disconnect the first relay switch K1-1 by magnetic attraction; the first switch tube V1 may be an NPN transistor.

[0039] Furthermore, the power conversion module 2 includes a second rectifier T2, a first inverter T4 and a second transformer B2; the charging pile mode switching module 3 includes a second relay switch K2-1 and a third relay switch K3-1; the charging gun module 4 includes a third rectifier T3 and a charging gun interface;

[0040] Specifically, the first end and the second end of the second rectifier T2 are respectively connected to the first static end and the second static end of the first relay switch K1-1, the third end and the fourth end of the second rectifier T2 are respectively connected to the first end and the second end of the first inverter T4, the third end and the fourth end of the first inverter T4 are respectively connected to the first end of the primary side of the second transformer B2 and the second end of the primary side of the second transformer B2, the first end of the secondary side of the second transformer B2 is connected to the first moving end of the second relay switch K2-1 and the first static end of the third relay switch K3-1, the second end of the secondary side of the second transformer B2 is connected to the second moving end of the second relay switch K2-1 and the second static end of the third relay switch K3-1, the first static end and the second static end of the second relay switch K2-1 are respectively connected to the first end and the second end of the third rectifier T3, the third end of the third rectifier T3 is connected to the first end of the charging gun interface and the first moving end of the third relay switch K3-1, and the fourth end of the third rectifier T3 is connected to the second end of the charging gun interface and the second moving end of the third relay switch K3-1.

[0041] In a specific embodiment, the first inverter T4 may be composed of four groups of IGBTs, and the inverter may be controlled by a single chip microcomputer; the second relay switch K2-1 may be a normally closed double-pole double-throw switch, and the third relay switch K3-1 may be a normally open double-pole double-throw switch.

[0042] Further, the power type detection module 5 includes a third resistor R3, a first capacitor C1, a first resistor R1 and a first optical coupler U1;

[0043] Specifically, the third end of the first optocoupler U1 is connected to the fourth end of the first rectifier T1 through the third resistor R3, the fourth end of the first optocoupler U1 is grounded, the first end of the first optocoupler U1 is connected to the first end of the charging gun interface through the first resistor R1, and the second end of the first optocoupler U1 is connected to the second end of the charging gun interface through the first capacitor C1.

[0044] In a specific embodiment, the first optical coupler U1 can be an EL814 photoelectric coupler.

[0045] Further, the power supply status detection module 6 includes a first logic chip J1 and a second logic chip J2;

[0046] Specifically, the B end of the first logic chip J1 and the B end of the second logic chip J2 are both connected to the third end of the first optocoupler U1, the A end of the first logic chip J1 and the A end of the second logic chip J2 are connected to the charging pile mode switching module 3, and the F end of the first logic chip J1 is connected to the F end of the second logic chip J2 and the base of the first switch tube V1.

[0047] In a specific embodiment, the first logic chip J1 may be an AND gate chip. When the A and B terminals of the first logic chip J1 are both at high levels, the F terminal of the first logic chip J1 outputs a high level. The second logic chip J2 may be an NOR gate chip. When the A and B terminals of the second logic chip J2 are both at low levels, the F terminal of the second logic chip J2 outputs a high level.

[0048] Furthermore, the charging pile mode switching module 3 also includes a fourth resistor R4, a fifth resistor R5, a first key switch S1, a sixth resistor R6, a second switch tube V2 and a second relay K2;

[0049] Specifically, one end of the second relay K2 is connected to one end of the fifth resistor R5 and is connected to the third end of the first rectifier T1 through the fourth resistor R4. The other end of the fifth resistor R5 is connected to the moving end of the first key switch S1. The other end of the second relay K2 is connected to the collector of the second switch tube V2. The base of the second switch tube V2 is connected to one end of the sixth resistor R6, the static end of the first key switch S1, the F end of the first logic chip J1 and the other F end of the second logic chip J2. The emitter of the second switch tube V2 is connected to the other end of the sixth resistor R6, the fourth end of the first rectifier T1 and the ground end.

[0050] In a specific embodiment, the second switch tube V2 can be an NPN transistor; the second relay K2 controls the disconnection of the second relay switch K2-1 and the closing of the third relay switch K3-1 by magnetic attraction.

[0051] In a voltage conversion circuit of a charging pile in the present embodiment, the power supply interface can be connected to the mains to access AC power, and the voltage is reduced, rectified, filtered and stabilized through the first transformer B1, the first rectifier T1, the second capacitor C2 and the first diode D1, and the first relay switch K1-1 transmits the power to the second rectifier T2, the first inverter T4 and the second transformer B2 for rectification, inversion and transformation. When the first button switch S1 is not pressed, it means that DC power supply is required. At this time, the transformed power is transmitted to the third rectifier T3 through the second relay switch K2-1, and the third rectifier T3 is rectified and then transmitted to the connected electric vehicle through the charging gun interface. At this time, the first optical coupler U1 will detect whether the power output by the charging gun interface is AC power. If the first optical coupler U1 is turned on, it means that the output The output is AC power, indicating that errors occur in the second relay switch K2-1 and the third relay switch K3-1 at this time. The F end of the second logic chip J2 controls the first switch tube V1 to turn on, and the first relay K1 directly controls the first relay switch K1-1 to turn off and stop power supply. When the first key switch S1 is pressed, it indicates that the required AC power is provided, the second switch tube V2 is turned on, the second relay K2 controls the second relay switch K2-1 to turn off, and controls the third relay switch K3-1 to close. If the first optical coupler U1 is in the off state at this time, it indicates that errors occur in the second relay switch K2-1 and the third relay switch K3-1. The F end of the first logic chip J1 outputs a high level, controls the first switch tube V1 to turn on, and the first relay K1 directly controls the first relay switch K1-1 to turn off and stop power supply.

[0052] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0053] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A voltage conversion circuit for a charging pile, characterized in that: The voltage conversion circuit of the charging pile includes: a power control module, a power conversion module, a charging pile mode switching module, a charging gun module, a power type detection module and a power supply status detection module; The power control module is connected to the power conversion module and the power supply status detection module, and is used to receive the AC power and transmit the AC power to the power conversion module, perform voltage reduction, rectification, filtering and voltage stabilization on the AC power and output the first power, and stop transmitting the AC power to the power conversion module when receiving the first control signal and the second control signal output by the power supply status detection module; The power conversion module is used to rectify, invert and transform the AC power and output the second power; The charging pile mode switching module is connected to the power control module, the power conversion module and the charging gun module, and is used to receive the first electric energy and provide a first switching signal, and transmit the second electric energy to the charging gun module; The charging gun module is used to directly transmit the received second electric energy to the connected electric vehicle, rectify the second electric energy and transmit the rectified electric energy to the connected electric vehicle; The power type detection module is connected to the charging gun module and the power control module, and is used to receive the second electric energy and detect the second electric energy input to the charging gun module or the electric energy rectified by the charging gun module, and output a first level signal when the electric energy output by the charging gun module is direct current electric energy, and output a second level signal when the electric energy output by the charging gun module is alternating current electric energy; The power supply status detection module is connected to the power type detection module and the charging pile mode switching module, and is used to output a first control signal when a first switching signal and a first level signal are received, and to output a second control signal when the first switching signal is not received and a second level signal is received.

2. A voltage conversion circuit for a charging pile according to claim 1, characterized in that: The power control module includes a power interface, a first transformer, a first relay switch, a first rectifier, a second capacitor, a first diode, a second resistor, a first relay and a first switch tube; The first end of the power interface is connected to the first moving end of the first relay switch and the first end of the primary side of the first transformer, the second end of the power interface is connected to the second moving end of the first relay switch and the second end of the primary side of the second transformer, the first end and the second end of the secondary side of the first transformer are respectively connected to the first end and the second end of the first rectifier, the third end of the first rectifier is connected to one end of the second capacitor and the cathode of the first diode and is connected to one end of the first relay through the second resistor, the other end of the first relay is connected to the collector of the first switch tube, the emitter of the first switch tube, the anode of the first diode, the other end of the second capacitor and the fourth end of the first rectifier are all grounded, the base of the first switch tube is connected to the power supply status detection module, and the first static end and the second static end of the first relay switch are connected to the power conversion module.

3. A voltage conversion circuit for a charging pile according to claim 2, characterized in that: The power conversion module includes a second rectifier, a first inverter and a second transformer; the charging pile mode switching module includes a second relay switch and a third relay switch; the charging gun module includes a third rectifier and a charging gun interface; The first end and the second end of the second rectifier are respectively connected to the first static end and the second static end of the first relay switch, the third end and the fourth end of the second rectifier are respectively connected to the first end and the second end of the first inverter, the third end and the fourth end of the first inverter are respectively connected to the first end of the primary side of the second transformer and the second end of the primary side of the second transformer, the first end of the secondary side of the second transformer is connected to the first moving end of the second relay switch and the first static end of the third relay switch, the second end of the secondary side of the second transformer is connected to the second moving end of the second relay switch and the second static end of the third relay switch, the first static end and the second static end of the second relay switch are respectively connected to the first end and the second end of the third rectifier, the third end of the third rectifier is connected to the first end of the charging gun interface and the first moving end of the third relay switch, and the fourth end of the third rectifier is connected to the second end of the charging gun interface and the second moving end of the third relay switch.

4. The voltage conversion circuit of a charging pile according to claim 3, characterized in that: The power type detection module includes a third resistor, a first capacitor, a first resistor and a first optical coupler; The third end of the first optocoupler is connected to the fourth end of the first rectifier through the third resistor, the fourth end of the first optocoupler is grounded, the first end of the first optocoupler is connected to the first end of the charging gun interface through the first resistor, and the second end of the first optocoupler is connected to the second end of the charging gun interface through the first capacitor.

5. The voltage conversion circuit of a charging pile according to claim 4, characterized in that: The power supply status detection module includes a first logic chip and a second logic chip; The B end of the first logic chip and the B end of the second logic chip are both connected to the third end of the first optocoupler, the A end of the first logic chip and the A end of the second logic chip are connected to the charging pile mode switching module, and the F end of the first logic chip is connected to the F end of the second logic chip and the base of the first switch tube.

6. The voltage conversion circuit of a charging pile according to claim 5, characterized in that: The charging pile mode switching module also includes a fourth resistor, a fifth resistor, a first key switch, a sixth resistor, a second switch tube and a second relay; One end of the second relay is connected to one end of the fifth resistor and is connected to the third end of the first rectifier through the fourth resistor. The other end of the fifth resistor is connected to the moving end of the first key switch. The other end of the second relay is connected to the collector of the second switch tube. The base of the second switch tube is connected to one end of the sixth resistor, the static end of the first key switch, the F end of the first logic chip and the other F end of the second logic chip. The emitter of the second switch tube is connected to the other end of the sixth resistor, the fourth end of the first rectifier and the ground end.

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