A calibration circuit

Abstract

The embodiment of the present invention discloses a calibration circuit, including: a control component, at least one output voltage sampling circuit, at least one charging port and at least one relay; the control component is used to control each relay to be in a first state within a preset time when each charging port is in a non-charging state, divide the power supply voltage, and obtain the first voltage at different times; each output voltage sampling circuit is used to divide the charging voltage of each charging port when each relay is in the first state, obtain the second voltage of each charging port at different times, and transmit the second voltage to the control component; the control component is also used to calculate the time calibration value of each relay in the first state according to the first voltage and the second voltage of each charging port; based on the time calibration value, the state of each relay is delayed when each charging port is in a charging and power-off action next time. The present invention improves the utilization rate of charging devices.

Description

Technical Field

[0001] The present invention relates to the field of circuits, and in particular to a calibration circuit. Background Art

[0002] Electric bicycle charging piles are mainly used to charge two-wheeled electric bicycles, two-wheeled / three-wheeled electric motorcycles, electric four-wheeled vehicles and low-speed electric cars. Generally, the output power can be controlled by controlling the opening / closing of the relay. Since there are inductive and capacitive power devices in the electric vehicle charger, at the moment when the relay is connected to the power supply and disconnected from the power supply, if the input power supply is at the peak voltage point of the sine wave, the relay contacts will form sparks and arcs, which may damage the relay and affect the service life of the relay.

[0003] The related technology uses a zero-crossing detection circuit to detect the zero-crossing point of the input power sine wave in real time, and feeds back the detected zero-crossing signal to the microcontroller unit (MCU). The MCU can calculate the period according to the frequency of the input power sine wave, and can calculate the position of the zero-crossing point of the next period of the input power sine wave according to the closing / opening action time of the relay, and then control the relay to delay closing / opening at the zero-crossing point, thereby solving the damage caused by the instantaneous access of the load to high voltage. However, the related technology assumes that the difference in action time between relays of the same model is the same, and does not consider the difference in action time caused by relay consistency and mechanical wear. Therefore, at the moment when the relay is connected to the power supply and disconnected from the power supply, the relay contacts may also form sparking and arcing phenomena, which reduces the service life of the relay and thus reduces the utilization rate of the charging device. Summary of the invention

[0004] The embodiment of the present invention provides a calibration circuit, which improves the utilization rate of the charging device.

[0005] The technical solution of the embodiment of the present invention is achieved as follows:

[0006] An embodiment of the present invention provides a calibration circuit; the calibration circuit comprises: a control component, at least one output voltage sampling circuit, at least one charging port, at least one relay and a power supply port; the second end of the control component is connected to the first end of each output voltage sampling circuit; the second end of each output voltage sampling circuit is respectively connected to the second end of each relay and the first end of the charging port; the power supply port is respectively connected to the first end of the control component and the first end of the relay;

[0007] The control component is used to control each of the relays to be in a first state within a preset time when each of the charging ports is in a non-charging state, and divide the power supply voltage of the power supply port to obtain a first voltage at different times; the first state of each relay includes each relay being closed or each relay being disconnected;

[0008] Each output voltage sampling circuit is used for dividing the charging voltage of each charging port when each relay is in the first state, obtaining a second voltage at different times corresponding to each charging port, and transmitting the second voltage at different times to the control component;

[0009] The control component is also used to calculate the time calibration value when each relay is in the first state according to the first voltage at different times and the second voltage at different times corresponding to each charging port; and based on the time calibration value, the state of each relay is delayed controlled the next time each charging port is in the charging and disconnecting action.

[0010] In the above circuit, the control component includes: a controller and a first voltage-dividing component; the first end of the first voltage-dividing component is connected to the first end of the controller; the second end of the first voltage-dividing component serves as the first end of the control component and is connected to the first end of the power supply port;

[0011] The controller is used to control each of the relays to be in a first state within a preset time when each of the charging ports is in a non-charging state;

[0012] The first voltage-dividing component is used to divide the power supply voltage of the power supply port when each relay is in the first state, obtain the first voltage at different times, and transmit the first voltage at different times to the controller.

[0013] In the above circuit, the first end of each output voltage sampling circuit is connected to the second end of the controller; the second end of each output voltage sampling circuit is connected to the second end of the relay;

[0014] Each output sampling circuit is used to divide the charging voltage of each charging port when each relay is in the first state, obtain the second voltage corresponding to each charging port at different times, and transmit the second voltage corresponding to each charging port at different times to the controller.

[0015] In the above circuit, the controller includes: a voltage acquisition port;

[0016] The controller is further used to receive the first voltage at different times through the voltage acquisition port.

[0017] In the above circuit, the controller further comprises: an analog-to-digital converter port;

[0018] The controller is further used to receive the second voltage corresponding to each charging port at different times through the analog-to-digital converter port.

[0019] In the above circuit, the at least one output voltage sampling circuit includes: a first output voltage sampling circuit and a second output voltage sampling circuit; the at least one charging port includes: a first charging port and a second charging port;

[0020] The second end of the control component is connected to the first end of the first output voltage sampling circuit; the second end of the first output voltage sampling circuit is respectively connected to the second end of each relay and the first end of the first charging port;

[0021] The second end of the control component is connected to the first end of the second output voltage sampling circuit; the second end of the second output voltage sampling circuit is respectively connected to the second end of each relay and the first end of the second charging port.

[0022] In the above circuit, the calibration circuit further comprises: at least one safety device;

[0023] Each relay is connected through each fuse and each charging port.

[0024] In the above circuit, the calibration circuit further comprises: a protection line and a neutral line;

[0025] The second end of each charging port is connected to the first end of the protection line and the first end of the neutral line respectively.

[0026] In the above circuit, the controller is also used to determine the charging voltage at different times corresponding to each charging port based on the second voltage at different times corresponding to each charging port when each relay is in the first state; obtain the first time in the time corresponding to the charging voltage at different times corresponding to each charging port; the first time is the time corresponding to the charging voltage of the preset zero crossing point; based on the first voltage at different times and the first time, calculate the time calibration value when each relay is in the first state; based on the time calibration value, the state of each relay is delayed controlled the next time each charging port is in the charging and power-off action.

[0027] In the above circuit, the controller is also used to determine the power supply voltage at different times based on the first voltage at different times; based on the first time, obtain the second time in the time corresponding to the power supply voltage at different times; the second time is the time corresponding to the power supply voltage at a preset zero point, and the first time and the second time are subtracted to obtain the time calibration value when each relay is in the first state.

[0028] In the above circuit, the controller is also used to subtract the preset half-cycle time from the time calibration value to obtain a difference; when each charging port is in the charging and power-off action next time, the difference is used to delay control the state of each relay.

[0029] An embodiment of the present invention provides a calibration circuit, the calibration circuit comprising: a control component, at least one output voltage sampling circuit, at least one charging port, at least one relay and a power supply port; the second end of the control component is connected to the first end of each output voltage sampling circuit; the second end of each output voltage sampling circuit is respectively connected to the second end of each relay and the first end of the charging port; the power supply port is respectively connected to the first end of the control component and the first end of the relay;

[0030] The control component is used to control each of the relays to be in the first state within a preset time when each of the charging ports is in a non-charging state, divide the power supply voltage of the power supply port, and obtain the first voltage at different times; the first state of each relay includes each relay being closed or each relay being disconnected; each output voltage sampling circuit is used to divide the charging voltage of each charging port when each of the relays is in the first state, obtain the second voltage at different times corresponding to each charging port, and transmit the second voltage at different times to the control component; the control component is also used to calculate the time calibration value when each relay is in the first state according to the first voltage at different times and the second voltage at different times corresponding to each charging port; and based on the time calibration value, the state of each relay is delayed when each charging port is in a charging and disconnecting action next time. This method reduces the arcing of the contacts as much as possible when each relay is disconnected or closed, thereby protecting the relay contacts and improving the utilization rate of the charging device. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 An optional structural diagram of a calibration circuit provided in an embodiment of the present invention Figure 1 ;

[0032] Figure 2An optional structural diagram of a calibration circuit provided in an embodiment of the present invention Figure 2 ;

[0033] Figure 3 An optional structural diagram of a calibration circuit provided in an embodiment of the present invention Figure 3 ;

[0034] Figure 4 An optional structural diagram of a calibration circuit provided in an embodiment of the present invention Figure 4 ;

[0035] Figure 5 An optional structural diagram of a calibration circuit provided in an embodiment of the present invention Figure 5 ;

[0036] Figure 6 An optional structural diagram of a calibration circuit provided in an embodiment of the present invention Figure 6 ;

[0037] Figure 7 An optional structural diagram of a calibration circuit provided in an embodiment of the present invention Figure 7 ;

[0038] Figure 8 An optional structural diagram of a calibration circuit provided in an embodiment of the present invention Figure 8 ;

[0039] Fig. 9 An optional structural diagram of a calibration circuit provided in an embodiment of the present invention Figure 9 ;

[0040] Fig.10 An optional structural diagram of a calibration circuit provided in an embodiment of the present invention Figure 10 ;

[0041] Fig.11 A schematic diagram of a flow chart of a calibration method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0044] In an embodiment of the present invention, Figure 1 An optional structural diagram of a calibration circuit provided in an embodiment of the present invention Figure 1 .

[0045] In an embodiment of the present invention, the calibration circuit includes: a control component 11, at least one output voltage sampling circuit 12, at least one charging port 13, at least one relay 14 and a power supply port 15. The second end of the control component 11 is connected to the first end of each output voltage sampling circuit 12; the second end of each output voltage sampling circuit 12 is respectively connected to the second end of each relay 14 and the first end of each charging port 13; the power supply port 15 is respectively connected to the first end of the control component 11 and the first end of the relay 14. The control component 11 is used to control each relay 14 to be in the first state within a preset time when each charging port 13 is in a non-charging state, divide the power supply voltage of the power supply port 15, and obtain the first voltage at different times; the first state of each relay 14 includes each relay 14 being closed or each relay 14 being disconnected. Each output voltage sampling circuit 12 is used to divide the charging voltage of each charging port 13 when each relay 14 is in the first state, obtain the second voltage at different times corresponding to each charging port 13, and transmit the second voltage at different times to the control component 11; the control component 11 is also used to calculate the time calibration value when each relay 14 is in the first state according to the first voltage at different times and the second voltage at different times corresponding to each charging port 13; and, based on the time calibration value, the state of each relay 14 is delayed when each charging port 13 is in the charging and disconnecting action next time.

[0046] In an embodiment of the present invention, when each charging port 13 is in a non-charging state, the control component 11 is used to control the opening or closing of each relay 14 within a preset time, and the power supply voltage of the power supply port 15 is divided to obtain the first voltage at different times; at least one output voltage sampling circuit 12 is designed at the output port, and each output voltage sampling circuit 12 is used to divide the charging voltage of each charging port 13 when each relay 14 is opened or closed, so as to obtain the second voltage at different times corresponding to each charging port 13, and finally, the first voltage at different times obtained and the second voltage at different times corresponding to each charging port 13 are used to calculate the time calibration value of each relay 14 when it is opened or closed, and the calibration value is used to delay the state of each relay 14 when each charging port 13 is in the charging and disconnecting action next time.

[0047] In some embodiments of the present invention, the control component 11 detects the power supply voltage of the power supply port 15 crossing the zero point, and immediately controls each relay 14 to close or open. Since each relay 14 has an action time, the actual closing or opening time of each relay 14 has been delayed. According to the closing or opening time of each relay 14 detected by the control component 11, the charging voltage zero crossing time of each charging port 13 is obtained near the closing or opening time of each relay 14. Finally, according to the power supply voltage zero crossing time of the power supply port 15 and the charging voltage zero crossing time of each charging port 13, the action calibration value of the closing or opening of each relay 14 is obtained, and then delay control is performed.

[0048] It can be understood that in the embodiment of the present invention, when each relay 14 is controlled to be disconnected or closed, the control component 11 divides the power supply voltage of the power supply port 15 within a preset time to obtain the first voltage at different times, and each output voltage sampling circuit 12 divides the charging voltage of each charging port 13 to obtain the second voltage at different times corresponding to each charging port 13; based on the first voltage at different times and the second voltage at different times corresponding to each charging port 13, the time calibration value of each relay 14 when it is disconnected or closed is calculated, and the calibration value is used to delay the state of each relay 14 when each charging port 13 is in the charging and disconnecting action next time. This method reduces the arcing of the contacts of each relay 14 as much as possible when it is disconnected or closed, thereby protecting the contacts of each relay and improving the utilization rate of the charging device.

[0049] In some embodiments of the present invention, Figure 2 An optional structural diagram of a calibration circuit provided in an embodiment of the present invention Figure 2 .

[0050] In some embodiments of the present invention, the control component 11 includes a controller 111 and a first voltage-dividing component 112; the first end of the first voltage-dividing component 112 is connected to the first end of the controller 111; the second end of the first voltage-dividing component 112 is connected to the first end of the power supply port 15 as the first end of the control component 11. The controller 111 is used to control each relay 14 to be in the first state within a preset time when each charging port 13 is in a non-charging state; the first voltage-dividing component 112 is used to divide the power supply voltage of the power supply port 15 when each relay 14 is in the first state, obtain the first voltage at different times, and transmit the first voltage at different times to the controller 111.

[0051] In some embodiments of the present invention, the first voltage dividing component 112 may be a resistor, a capacitor, or an inductor, etc., which is not limited by the present invention.

[0052] It can be understood that in some embodiments of the present invention, the controller 111 is further utilized to control each relay 14 to be in the first state within a preset time when each charging port 13 is in a non-charging state, and then the first voltage divider component 112 is utilized to divide the power supply voltage of the power supply port 15 to obtain the first voltage at different times, so as to facilitate the subsequent calculation of the power supply voltage of the power supply port 15.

[0053] In some embodiments of the present invention, Figure 3 An optional structural diagram of a calibration circuit provided in an embodiment of the present invention Figure 3 .

[0054] In some embodiments of the present invention, the first end of each output voltage sampling circuit 12 is connected to the second end of the controller; the second end of each output voltage sampling circuit 12 is connected to the second end of each relay 14; each output voltage sampling circuit 12 is used to divide the charging voltage of each charging port 13 when each relay 14 is in the first state, to obtain the second voltage corresponding to each charging port 13 at different times, and transmit the second voltage corresponding to each charging port 13 at different times to the controller 111.

[0055] In some embodiments of the present invention, when each charging port 13 is in a non-charging state, the controller 111 controls each relay 14 to be in the first state within a preset time, and uses each output voltage sampling circuit 12 to divide the charging voltage of each charging port 13 when each relay 14 is in the first state to obtain a second voltage at different times corresponding to each charging port 13, and transmit the second voltage at different times corresponding to each charging port 13 to the controller 111.

[0056] It is understandable that in some embodiments of the present invention, the controller 111 is further used to control each relay 14 to be in the first state within a preset time when each charging port 13 is in a non-charging state, and then each output voltage sampling circuit 12 is used to divide the charging voltage of each charging port 13 to obtain the second voltage corresponding to each charging port 13 at different times, so as to facilitate the subsequent calculation of the charging voltage of each charging port 13.

[0057] In some embodiments of the present invention, based on Figure 3 , Figure 4 An optional structural diagram of a calibration circuit provided in an embodiment of the present invention Figure 4 .

[0058] In some embodiments of the present invention, each output sampling circuit 12 includes: a second voltage divider component 121 and a third voltage divider component 122; the first end of the second voltage divider component 121 is connected to the second end of the controller 111; and is connected to the first end of the third voltage divider component 122; the second end of the second voltage divider component 121 is grounded; the second end of the third voltage divider component 122 is connected to the first end of each charging port and the second end of each relay 14.

[0059] In some embodiments of the present invention, based on Figure 4 , Figure 5 An optional structural diagram of a calibration circuit provided in an embodiment of the present invention Figure 5 .

[0060] In some embodiments of the present invention, the controller 111 includes: a voltage acquisition port 1111; the voltage acquisition port 1111 is used to receive the first voltage at different times.

[0061] In some embodiments of the present invention, based on Figure 5 , Figure 6 An optional structural diagram of a calibration circuit provided in an embodiment of the present invention Figure 6 .

[0062] In some embodiments of the present invention, the controller 111 includes: an analog-to-digital converter port 1112 ; the analog-to-digital converter port 1112 is used to receive the second voltage corresponding to each charging port 13 at different times.

[0063] In some embodiments of the present invention, based on Figure 6 , Figure 7 An optional structural diagram of a calibration circuit provided in an embodiment of the present invention Figure 7 .

[0064] In an embodiment of the present invention, at least one output voltage sampling circuit 12 includes: a first output voltage sampling circuit 123 and a second output voltage sampling circuit 124; at least one charging port 13 includes: a first charging port 131 and a second charging port 132; the second end of the control component 11 is connected to the first end of the first output voltage sampling circuit 123; the second end of the first output voltage sampling circuit 123 is respectively connected to the second end of each relay 14 and the first end of the first charging port 131; the second end of the control component 11 is connected to the first end of the second output voltage sampling circuit 124; the second end of the second output voltage sampling circuit 124 is respectively connected to the second end of each relay 14 and the first end of the second charging port 132.

[0065] In some embodiments of the present invention, at least one relay 14 may include: a first relay 141 and a second relay 142; therefore, the second end of the control component 11 is connected to the first end of the first output voltage sampling circuit 123; the second end of the first output voltage sampling circuit 123 is respectively connected to the second end of the first relay 141 and the first end of the first charging port 131; the second end of the control component 11 is connected to the first end of the second output voltage sampling circuit 124; the second end of the second output voltage sampling circuit 124 is respectively connected to the second end of the second relay 142 and the first end of the second charging port 132.

[0066] In the embodiment of the present invention, the first output voltage sampling circuit 123 includes: a second voltage dividing component 121 and a third voltage dividing component 122 , and the second output voltage sampling circuit 124 also includes: a second voltage dividing component 121 and a third voltage dividing component 122 .

[0067] In some embodiments of the present invention, based on Figure 7 , Figure 8 An optional structural diagram of a calibration circuit provided in an embodiment of the present invention Figure 8 .

[0068] In some embodiments of the present invention, the calibration circuit further includes: at least one fuse device 16 ; each relay 14 is connected to each charging port 13 via each fuse device 16 .

[0069] In some embodiments of the present invention, at least one safety device 16 may include: a first safety device 161 and a second safety device 162; the first end of the first safety device 161 is connected to the second end of the first relay 141; the second end of the first safety device 161 is connected to the first end of the first charging port 131; the first end of the second safety device 162 is connected to the second end of the second relay 142; the second end of the second safety device 162 is connected to the first end of the second charging port 132.

[0070] In some embodiments of the present invention, each safety device 16 is used to generate heat and automatically fuse when an excessive current flows through the circuit, thereby cutting off the circuit and protecting the circuit.

[0071] In some embodiments of the present invention, based on Figure 8 , Fig. 9 An optional structural diagram of a calibration circuit provided in an embodiment of the present invention Figure 9 .

[0072] In some embodiments of the present invention, the calibration circuit further includes: a protection line 17 and a neutral line 18 , and the second end of each charging port 13 is connected to the first end of the protection line 17 and the first end of the neutral line 18 , respectively.

[0073] In some embodiments of the present invention, the protective line 17 is used to prevent the device housing from being charged and thus causing electric shock accidents. The neutral line 18 is used to enable the power supply device to work normally.

[0074] In some embodiments of the present invention, the controller 111 is also used to determine the charging voltage at different times corresponding to each charging port 13 based on the second voltage at different times corresponding to each charging port 13 when each relay 14 is in the first state; obtain the first time in the time corresponding to the charging voltage at different times corresponding to each charging port 13; the first time is the time corresponding to the charging voltage at a preset zero point; based on the first voltage and the first time at different times, calculate the time calibration value of each relay 14 in the first state; based on the time calibration value, the next time each charging port 13 is in a charging and power-off action, the state of each relay 14 is delayed controlled.

[0075] Exemplarily, the first state of each relay 14 includes a closed state or a disconnected state. When each relay 14 is in the closed state, the charging voltage at different times corresponding to each charging port 13 is determined based on the second voltage at different times corresponding to each charging port 13; in the time corresponding to the charging voltage at different times, a third time Tont1 is obtained, and the third time Tont1 is the time of the charging voltage at the zero crossing point of the first sine wave. Based on the first voltage at different times and the third time Tont1, the time calibration value of each relay 14 in the closed state is calculated; based on the time calibration value, the state of each relay 14 is delayed when each charging port 13 is in a charging action next time. When the second voltage divider component 121 is Fig.10 The resistor 121 and the third voltage divider component 122 Fig.10 When the resistor 122 is used, the charging voltage corresponding to the first charging port 131 is calculated by using the second voltage at different times corresponding to the first charging port 131 as an example, as shown in the following formulas (1) and (2):

[0076]

[0077]

[0078] In the above formula (1) and formula (2), R1 is the resistor 121, R2 is the resistor 122; VAD is the second voltage value collected by the analog-to-digital converter port 1112 in the controller 111; and Vout is the charging voltage of the first charging port 131.

[0079] Exemplarily, when each relay 14 is in the disconnected state, the charging voltage at different times corresponding to each charging port 13 is determined based on the second voltage at different times corresponding to each charging port 13; in the time corresponding to the charging voltage at different times, the fourth time Tont2 is obtained, and the fourth time Tont2 is the time of the charging voltage at the last sine wave crossing the zero point. Based on the first voltage at different times and the fourth time Tont2, the time calibration value of each relay 14 in the disconnected state is calculated; based on the time calibration value, the state of each relay 14 is delayed when each charging port 13 is in the power-off action next time. When each relay 14 is in the disconnected state, the charging voltage at different times corresponding to each charging port 13 is calculated in the same manner as formula (1) and formula (2).

[0080] It can be understood that in some embodiments of the present invention, when each relay 14 is in the first state, the controller 111 determines the charging voltage at different times corresponding to each charging port 13 based on the second voltage at different times corresponding to each charging port 13; obtains the first time in the time corresponding to the charging voltage at different times, and the first time is the time corresponding to the charging voltage at a preset zero point; based on the first time and the first voltage at different times, calculates the time calibration value of each relay 14 in the first state, thereby improving the accuracy of the action time calibration of each relay 14, thereby increasing the life of each relay, and further improving the utilization rate of the charging device.

[0081] In some embodiments of the present invention, the controller 111 is also used to determine the power supply voltage at different times based on the first voltage at different times; based on the first time, obtain the second time in the time corresponding to the power supply voltage at different times; the second time is the time corresponding to the power supply voltage at a preset zero point, and the first time and the second time are subtracted to obtain the time calibration value of each relay 14 in the first state.

[0082] Exemplarily, when each relay 14 is in the closed state, the controller 111 determines the power supply voltage at different times based on the first voltage at different times, and finds the time T corresponding to the power supply voltage at the zero crossing point near the third time Tont1 among the power supply voltages at different times. IN1 , that is, in the power supply voltage at different times, T IN1 The corresponding power supply voltage is 0V, and T IN1 Less than Tont1. IN1 The difference is calculated to obtain the time calibration value of each relay 14 in the closed state. Fig.10 The resistors 1121 and 1122 in the circuit are used to calculate the power supply voltage as shown in the following formulas (3) and (4):

[0083]

[0084]

[0085] In the above formula (3) and formula (4), R3 and R4 are resistors 1121 and 1122; VIN is the power supply voltage; and VP is the first voltage collected by the voltage collection port 1111 in the controller 111.

[0086] Exemplarily, when each relay 14 is in the disconnected state, the controller 111 determines the power supply voltage at different times based on the first voltage at different times, and finds the time T corresponding to the power supply voltage at the zero crossing point near the fourth time Tont2 among the power supply voltage at different times. IN2 , that is, in the power supply voltage at different times, V IN2 The corresponding power supply voltage is 0V, T IN2 is smaller than Tont2 and closest to Tont2. IN2 By making a difference, the time calibration value of each relay 14 in the disconnected state is obtained. When each relay 14 is in the disconnected state, the power supply voltage is calculated in the same way as formula (3) and formula (4).

[0087] It is understandable that in some embodiments of the present invention, the controller 111 determines the power supply voltage at different times based on the first voltage at different times; obtains the second time in the time corresponding to the power supply voltage at different times; the second time is the time corresponding to the power supply voltage at the preset zero crossing point, and finally the first time obtained is subtracted from the second time to obtain the time calibration value of each relay 14 in the first state. The calibration value is used to delay the action time of each relay 14, thereby increasing the service life of each relay 14 and improving the utilization rate of the charging device.

[0088] In some embodiments of the present invention, the controller 111 is further used to obtain a difference by subtracting a preset half-cycle time from a time calibration value; and to perform delay control on the state of each relay 14 when each charging port 13 is in a charging and power-off action next time.

[0089] In some embodiments of the present invention, the preset half-cycle time and the time calibration value when each relay 14 is in the closed state are subtracted to obtain the difference value, and the next time each charging port 13 is in the charging action, the difference value is used to delay the closing state of each relay 14. Or, the preset half-cycle time and the time calibration value when each relay 14 is in the disconnected state are subtracted to obtain the difference value, and the next time each charging port 13 is in the power-off action, the difference value is used to delay the disconnected state of each relay 14.

[0090] It can be understood that, in some embodiments of the present invention, in summary, by designing at least one output voltage sampling circuit 12 at the output port, when each relay 14 is in a closed or open state, the control component 11 is used to divide the power supply voltage of the power supply port 15 to obtain the first voltage at different times; each output voltage sampling circuit 12 is used to divide the charging voltage of each charging port 13 to obtain the second voltage at different times corresponding to each charging port 13; based on the first voltage at different times and the second voltage at different times corresponding to each charging port 13, the power supply voltage at different times and the charging voltage at different times corresponding to each charging port 13 are obtained; among the power supply voltage at different times and the charging voltage at different times corresponding to each charging port 13, the corresponding time when the voltage is 0 that meets the conditions is found; using the corresponding time when the voltage is 0 that meets the conditions, the time calibration value of the closed or open state of each relay 14 is calculated, and finally, using the time calibration value, the state of each relay 14 is delayed controlled when each charging port 13 is in the charging and disconnecting action next time. The method solves the difference in action time caused by the consistency and mechanical wear of each relay 14, greatly eliminates the sparking and arcing phenomena of the contacts of each relay 14, and improves the utilization rate of the charging device.

[0091] In some embodiments of the present invention, based on Fig. 9 , Fig.10 An optional structural diagram of a calibration circuit provided in an embodiment of the present invention Figure 10 .

[0092] The calibration circuit also includes: resistor 19 and resistor 20; the controller 111 also includes a first input port 1113, a second input port 1114, a third input port 1115, and a fourth input port 1116; the first end of the resistor 19 is connected to the first input port 1113 and the neutral line 18, respectively, and the second end of the resistor 19 is connected to the second input port 1114 and the second end of the first charging port 131, respectively. The first end of the resistor 20 is connected to the neutral line 18 and the third input port 1115, respectively; the second end of the resistor 20 is connected to the fourth input port 1116 and the second end of the second charging port 132, respectively. Resistors 19 and 20 are current sampling resistors of the metering chip, which are used to measure the output current. When the first voltage divider component 112 includes: resistor 1121 and resistor 1122; the second voltage divider component 121 is resistor 121; and the third voltage divider component 122 is resistor 122, as Fig.10 shown.

[0093] It can be understood that in some embodiments of the present invention, when each relay 14 is controlled to be disconnected or closed, the controller 111 uses the resistors 1121 and 1122 to divide the power supply voltage of the power supply port 15 within a preset time to obtain the first voltage at different times, and the resistors 121 and 122 respectively divide the charging voltages of the first charging port 131 and the second charging port 132 to obtain the second voltages at different times corresponding to the first charging port 131 and the second charging port 132; based on the first voltage at different times and the second voltages at different times corresponding to the first charging port 131 and the second charging port 132, the time calibration value of each relay 14 when it is disconnected or closed is calculated, and the calibration value is used to delay the state of each relay 14 when the first charging port 131 and the second charging port 132 are in the charging and disconnecting action next time. This method reduces the arcing of the contacts of each relay 14 as much as possible when it is disconnected or closed, thereby protecting the contacts of each relay 14 and improving the utilization rate of the charging device.

[0094] Based on the above calibration circuit, an embodiment of the present invention provides a calibration method, which is applied to the above calibration circuit, such as Fig.11 As shown, the method includes: S101-S103.

[0095] S101. When each charging port is in a non-charging state, the calibration circuit controls each relay to be in a first state within a preset time through a control component, divides the power supply voltage of the power supply port, and obtains a first voltage at different times; the first state of each relay includes each relay being closed or disconnected.

[0096] S102. When each relay is in the first state, the calibration circuit divides the charging voltage of each charging port through each output voltage sampling circuit to obtain a second voltage corresponding to each charging port at different times, and transmits the second voltage corresponding to each charging port at different times to the control component.

[0097] S103, the calibration circuit calculates the time calibration value when each relay is in the first state according to the first voltage at different times and the second voltage at different times corresponding to each charging port through the control component; and, based on the time calibration value, the state of each relay is delayed controlled when each charging port is in the charging and disconnecting action next time.

[0098] It can be understood that in some embodiments of the present invention, when each charging port 13 is in a non-charging state, the calibration circuit controls each relay 14 to be in the first state within a preset time through the control component 11, divides the power supply voltage of the power supply port 15, and obtains the first voltage at different times; the first state of each relay 14 includes each relay being closed or disconnected; when each relay 14 is in the first state, the calibration circuit divides the charging voltage of each charging port 13 through each output voltage sampling circuit 12, obtains the second voltage at different times corresponding to each charging port 13, and transmits the second voltage at different times corresponding to each charging port 13 to the control component 11; the calibration circuit calculates the time calibration value when each relay 14 is in the first state according to the first voltage at different times and the second voltage at different times corresponding to each charging port 13 through the control component 11; and, based on the time calibration value, the state of each relay 14 is delayed when each charging port 13 is in a charging and disconnecting action next time. This method ensures that each relay 14 closes or opens when the power supply voltage at the power supply port 15 is at the zero point of the sine wave, thereby solving the difference in action time caused by the consistency and mechanical wear of each relay 14, greatly eliminating the sparking and arcing phenomena of the contacts of each relay 14, and improving the utilization rate of the charging device.

[0099] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of hardware embodiments, software embodiments, or embodiments combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) containing computer-usable program code.

[0100] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0101] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0102] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0103] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A calibration circuit, characterized in that: The calibration circuit comprises: A control component, at least one output voltage sampling circuit, at least one charging port, at least one relay and a power supply port; the second end of the control component is connected to the first end of each output voltage sampling circuit; the second end of each output voltage sampling circuit is respectively connected to the second end of each relay and the first end of the charging port; the power supply port is respectively connected to the first end of the control component and the first end of the relay; The control component is used to control each of the relays to be in a first state within a preset time when each of the charging ports is in a non-charging state, and divide the power supply voltage of the power supply port to obtain a first voltage at different times; the first state of each relay includes each relay being closed or each relay being disconnected; Each output voltage sampling circuit is used for dividing the charging voltage of each charging port when each relay is in the first state, obtaining a second voltage at different times corresponding to each charging port, and transmitting the second voltage at different times to the control component; The control component is further used to calculate the time calibration value when each relay is in the first state according to the first voltage at different times and the second voltage at different times corresponding to each charging port; and based on the time calibration value, when each charging port is in the charging and disconnecting action next time, delay control of the state of each relay; The calculating, according to the first voltage at different times and the second voltage at different times corresponding to each charging port, a time calibration value when each relay is in the first state includes: In the time corresponding to each of the second voltages at different moments corresponding to each charging port, a first time is obtained; the first time is the time corresponding to the charging voltage at a preset zero-crossing point; based on the first voltage at different moments, the power supply voltage at different moments is determined; in the time corresponding to each of the power supply voltages at different moments, the time corresponding to the zero-crossing voltage near the first time is determined as the corresponding second time; the corresponding first time and the second time are subtracted to obtain the time calibration value when each relay is in the first state.

2. The circuit according to claim 1, characterized in that The control component comprises: a controller and a first voltage-dividing component; a first end of the first voltage-dividing component is connected to a first end of the controller; a second end of the first voltage-dividing component is used as a first end of the control component and is connected to a first end of the power supply port; The controller is used to control each of the relays to be in a first state within a preset time when each of the charging ports is in a non-charging state; The first voltage-dividing component is used to divide the power supply voltage of the power supply port when each relay is in the first state, obtain the first voltage at different times, and transmit the first voltage at different times to the controller.

3. The circuit according to claim 2, characterized in that The first end of each output voltage sampling circuit is connected to the second end of the controller; the second end of each output voltage sampling circuit is connected to the second end of the relay; Each output sampling circuit is used to divide the charging voltage of each charging port when each relay is in the first state, obtain the second voltage corresponding to each charging port at different times, and transmit the second voltage corresponding to each charging port at different times to the controller.

4. The circuit according to claim 3, characterized in that Each output sampling circuit includes: a second voltage divider component and a third voltage divider component; the first end of the second voltage divider component is connected to the second end of the controller; and is connected to the first end of the third voltage divider component; the second end of the second voltage divider component is grounded; the second end of the third voltage divider component is connected to the first end of each charging port and the second end of each relay.

5. The circuit according to claim 2, characterized in that The controller comprises: a voltage acquisition port; The controller is further used to receive the first voltage at different times through the voltage acquisition port.

6. The circuit according to claim 2 or 4, characterized in that: The controller also includes: an analog-to-digital converter port; The controller is further used to receive the second voltage corresponding to each charging port at different times through the analog-to-digital converter port.

7. The circuit according to any one of claims 1 to 5, characterized in that: The at least one output voltage sampling circuit includes: a first output voltage sampling circuit and a second output voltage sampling circuit; the at least one charging port includes: a first charging port and a second charging port; The second end of the control component is connected to the first end of the first output voltage sampling circuit; the second end of the first output voltage sampling circuit is respectively connected to the second end of each relay and the first end of the first charging port; The second end of the control component is connected to the first end of the second output voltage sampling circuit; the second end of the second output voltage sampling circuit is respectively connected to the second end of each relay and the first end of the second charging port.

8. The circuit according to any one of claims 1 to 5, characterized in that: The calibration circuit further comprises: at least one safety device; Each relay is connected through each fuse and each charging port.

9. The circuit according to any one of claims 1 to 5, characterized in that: The calibration circuit also includes: a protection line and a neutral line; The second end of each charging port is connected to the first end of the protection line and the first end of the neutral line respectively.

10. The circuit according to claim 9, characterized in that The controller is further used to obtain a difference between the preset half-cycle time and the time calibration value; and when each charging port is in the charging and power-off action next time, the difference is used to delay control the state of each relay.

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