Single power isolation driven DCDC converter and new energy vehicle

Abstract

The application relates to a single-power-source isolated driving DCDC converter and a new energy vehicle, wherein the converter comprises a direct-current driving circuit, a sampling circuit, a master control chip, a single-power-source transformer isolated driving circuit and a rectification driving circuit, the sampling circuit is used for collecting circuit parameters in a direct-current voltage output process, the master control chip is used for respectively sending a first driving signal to the single-power-source transformer isolated driving circuit and sending a second driving signal to the rectification driving circuit according to the circuit parameters, the single-power-source transformer isolated driving circuit generates an inverter driving signal by using the first driving signal, and the rectification driving circuit generates a rectification driving signal by using the second driving signal; and a direct-current output circuit is used for inverting a direct-current power supply into an alternating-current power supply by using the inverter driving signal, rectifying the alternating-current power supply by using the rectification driving signal, and outputting a stable target direct-current voltage. The single-power-source transformer isolated driving circuit is used for isolated driving, and the complexity of the isolated driving is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicle-mounted technology, and particularly relates to a single-power isolated driving DCDC converter and a new energy vehicle. BACKGROUND

[0002] In recent years, in order to save fossil fuels and effectively control the emission of greenhouse gases, countries pay more and more attention to the market development and technical research of new energy vehicles. The DC / DC charging power supply is an essential part of electric vehicles, and the research and development of the DC / DC charging power supply also attract the attention of the industry. The vehicle-mounted DC / DC power supply occupies the main market of the vehicle-mounted power supply industry due to its small size, portability, high efficiency and reliability, and therefore the development of the vehicle-mounted DC / DC power supply is particularly important. At present, in the development process of the vehicle-mounted DC / DC power supply, the process of isolated driving is very complex and multiple devices are required.

[0003] At present, no effective solution has been proposed for the above problems. SUMMARY

[0004] The present application provides a single-power isolated driving DCDC converter and a new energy vehicle to solve the technical problem of high complexity of the process of isolated driving and the requirement of multiple devices.

[0005] According to an aspect of an embodiment of the present application, the present application provides a single-power isolated driving DCDC converter, comprising: a direct-current driving circuit, comprising a sampling circuit, a master control chip, a single-power transformer isolated driving circuit and a rectifier driving circuit, the sampling circuit is used to collect circuit parameters in a direct-current voltage output process, the master control chip is used to respectively send a first driving signal to the single-power transformer isolated driving circuit and a second driving signal to the rectifier driving circuit according to the circuit parameters, the single-power transformer isolated driving circuit generates an inverter driving signal by using the first driving signal, and the rectifier driving circuit generates a rectifier driving signal by using the second driving signal; and a direct-current output circuit, connected with the direct-current driving circuit, used to invert a direct-current power into an alternating-current power by using the inverter driving signal, and rectify the alternating-current power by using the rectifier driving signal to output a stable target direct-current voltage.

[0006] Optionally, the direct current output circuit comprises a direct current input end, an input anti-reverse soft start circuit, an electromagnetic compatibility filter circuit, a bus capacitor, a phase-shifted full-bridge circuit, an isolation transformer, a full-wave rectifier circuit, an output filter circuit, an isolation protection circuit and a direct current output end, the direct current input end is connected with the input anti-reverse soft start circuit, the input anti-reverse soft start circuit is connected with the electromagnetic compatibility filter circuit, the electromagnetic compatibility filter circuit is connected with the bus capacitor, the bus capacitor is connected with the phase-shifted full-bridge circuit, the phase-shifted full-bridge circuit is connected with the isolation transformer, the isolation transformer is connected with the full-wave rectifier circuit, the full-wave rectifier circuit is connected with the output filter circuit, the output filter circuit is connected with the isolation protection circuit, and the isolation protection circuit is connected with the direct current output end.

[0007] Optionally, the phase-shifted full-bridge circuit comprises a first MOS group, a second MOS group, a third MOS group, a fourth MOS group, a resonant inductor, a first DC blocking capacitor, a first clamping diode and a second clamping diode, the first MOS group and the second MOS group are connected in series to form a first branch, the third MOS group and the fourth MOS group are connected in series to form a second branch, the first branch and the second branch are connected in parallel, one end of the resonant inductor is connected with the first MOS group, the other end of the resonant inductor is connected with one end of the first DC blocking capacitor, the other end of the first DC blocking capacitor is connected with the isolation transformer, the negative electrode of the first clamping diode is connected with the MOS group, the positive electrode of the first clamping diode is connected with the negative electrode of the second clamping diode, and the positive electrode of the second clamping diode is connected with the fourth MOS group.

[0008] Optionally, any MOS group comprises a first resistor, a second resistor and a MOS tube, one end of the first resistor is connected with the signal output end of the single power transformer isolation driving circuit, the other end of the first resistor is connected with the gate of the MOS tube and one end of the second resistor, and the other end of the second resistor is connected with the drain of the MOS tube.

[0009] Optionally, the input anti-reverse soft start circuit comprises a diode, a third resistor and a relay, the positive electrode of the diode is connected with the direct current input end, the negative electrode of the diode and the third resistor are connected in series to form a third branch, the third branch is connected in parallel with a fourth branch in which the relay is located, and the third branch is used for controlling the direct current input power in the forward direction to complete soft start.

[0010] Optionally, the sampling circuit comprises: a high-voltage side isolation voltage sampling circuit, a low-voltage side voltage sampling circuit, a current sampling circuit and a temperature sampling circuit, the high-voltage side isolation voltage sampling circuit is connected with the DC output circuit and the master control chip, the high-voltage side isolation voltage sampling circuit sends the circuit parameters collected from the DC output circuit to the master control chip, the low-voltage side voltage sampling circuit is connected with the DC output circuit and the master control chip, the low-voltage side voltage sampling circuit sends the circuit parameters collected from the DC output circuit to the master control chip, the current sampling circuit is connected with the DC output circuit and the master control chip, the current sampling circuit sends the circuit parameters collected from the DC output circuit to the master control chip, the temperature sampling circuit is connected with the DC output circuit and the master control chip, and the temperature sampling circuit sends the circuit parameters collected from the DC output circuit to the master control chip.

[0011] Optionally, the current sampling circuit comprises a current sampling operational amplifier chip, a pin of the current sampling operational amplifier chip is connected with a DC output end of the DC output circuit, the current sampling operational amplifier chip is used for operational amplifying the output voltage of the collected DC output end to obtain an operational voltage signal and output the operational voltage signal to the master control chip, so that the master control chip obtains the output current through the operational voltage signal.

[0012] Optionally, the single power transformer isolation driving circuit comprises an RC filter circuit and a power amplifier circuit, the RC filter circuit and the power amplifier circuit are connected, the RC filter circuit outputs the RC filtered first driving signal to the power amplifier circuit, and the power amplifier circuit performs power amplification on the filtered first driving signal and outputs the power amplified first driving signal to the phase-shifted full-bridge circuit.

[0013] Optionally, the single power transformer isolation driving circuit further comprises a second DC blocking capacitor, the second DC blocking capacitor is connected with the power amplifier circuit, and the second DC blocking capacitor is used for suppressing DC bias magnetization.

[0014] Optionally, the single power transformer isolation driving circuit further comprises a plurality of TVS diodes, the plurality of TVS diodes are connected in parallel, and the plurality of TVS diodes are used for driving protection of the circuit.

[0015] According to an aspect of an embodiment of the present application, the present application provides a new energy vehicle adopting the single power isolation driving DCDC converter as described above.

[0016] Compared with related technologies, the above technical solutions provided by the embodiments of the present application have the following advantages:

[0017] This application discloses a single-supply isolated DC-DC converter, comprising: a DC drive circuit, including a sampling circuit, a main control chip, a single-supply transformer isolated drive circuit, and a rectifier drive circuit. The sampling circuit is used to collect circuit parameters during the DC voltage output process. The main control chip is used to send a first drive signal to the single-supply transformer isolated drive circuit and a second drive signal to the rectifier drive circuit according to the circuit parameters. The single-supply transformer isolated drive circuit uses the first drive signal to generate an inverter drive signal, and the rectifier drive circuit uses the second drive signal to generate a rectifier drive signal. A DC output circuit, connected to the DC drive circuit, is used to invert the DC power supply to AC power supply using the inverter drive signal and rectify the AC power supply using the rectifier drive signal to output a stable target DC voltage. The use of a single-supply transformer isolated drive circuit for isolated drive reduces the complexity of the isolated drive process. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of an optional single-supply isolated driven DC-DC converter according to an embodiment of this application;

[0021] Figure 2 This is a structural block diagram of an optional single-supply isolated driven DC-DC converter according to an embodiment of this application;

[0022] Figure 3 This is a schematic diagram of an optional DC output circuit provided according to an embodiment of this application;

[0023] Figure 4 This is a schematic diagram of an optional current sampling circuit provided according to an embodiment of this application;

[0024] Figure 5 This is a schematic diagram of an optional single-supply transformer isolation drive circuit according to an embodiment of this application;

[0025] Figure 6 This is a schematic diagram of an optional direction-shifting drive signal provided according to an embodiment of this application. Detailed Implementation

[0026] In order to make the purposes, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0027] In the following description, the suffixes such as "module", "part", or "unit" used for an element are merely for facilitating the description of the present application, and have no particular meaning by themselves. Therefore, "module" and "part" can be used interchangeably.

[0028] In recent years, in order to save fossil fuels and effectively control the emission of greenhouse gases, countries are increasingly enthusiastic about the market development and technical research of new energy vehicles. And the DC / DC charging power supply is an essential part of electric vehicles, and its research and development have also attracted attention in the industry. The on-board DC / DC power supply occupies the main market of the vehicle power supply industry due to its small size, portability, high efficiency, and reliability, so the development of on-board DC / DC power supply is particularly important. At present, in the development process of on-board DC / DC power supply, the process complexity of isolation driving is very high, and multiple devices are required.

[0029] In order to solve the problems mentioned in the background art, according to one aspect of the embodiments of the present application, the present application provides a single power supply isolation driven DCDC converter, as shown in Figure 1 , comprising:

[0030] The direct current driving circuit 102 comprises a sampling circuit, a master control chip, a single power supply transformer isolation driving circuit, and a rectifier driving circuit. The sampling circuit is used to collect circuit parameters in the direct current voltage output process. The master control chip is used to send a first driving signal to the single power supply transformer isolation driving circuit and a second driving signal to the rectifier driving circuit according to the circuit parameters. The single power supply transformer isolation driving circuit generates an inverter driving signal using the first driving signal. The rectifier driving circuit generates a rectifier driving signal using the second driving signal.

[0031] The direct current output circuit 104 is connected with the direct current driving circuit, and is used to invert the direct current power supply into alternating current power supply using the inverter driving signal, and rectify the alternating current power supply using the rectifier driving signal to output a stable target direct current voltage.

[0032] The present application can be applied to new energy vehicle on-board DCDC power supply.

[0033] The technical concept of using a single-power isolation transformer in this application can replace the drive circuit composed of a flyback isolation power supply and an isolation driver chip. It only requires one DC power supply, which can effectively reduce the complexity of isolation drive and the number of components.

[0034] This application provides a structural block diagram of a single-supply isolated driven DC-DC converter, as shown in the figure. Figure 2 As shown, it includes: a DC input terminal, an input reverse soft-start circuit, an electromagnetic compatibility filter circuit, a bus capacitor, a phase-shifted full-bridge circuit (with clamping diodes), an isolation transformer (with a center plug), a full-wave rectifier circuit, an output filter circuit, an isolation protection circuit, a DC output terminal, a voltage power supply circuit, a high-voltage side isolation voltage sampling circuit, a single-power transformer isolation drive circuit, a drive circuit, a low-voltage side voltage sampling circuit, a current sampling circuit, a temperature sampling circuit, CAN communication, and a main control chip, etc. The DC output circuit in this application includes... Figure 2 The DC input terminal, input reverse soft-start circuit, electromagnetic compatibility filter circuit, bus capacitor, phase-shifted full-bridge circuit (with clamping diodes), isolation transformer (with center plug), full-wave rectifier circuit, output filter circuit, isolation protection circuit, and DC output terminal, and the DC drive circuit include... Figure 2 The circuit includes a high-voltage side isolation voltage sampling circuit, a single-power transformer isolation drive circuit, a drive circuit, a low-voltage side voltage sampling circuit, a current sampling circuit, a temperature sampling circuit, and a main control chip.

[0035] This application is based on the above. Figure 2An embodiment is provided. First, the direct current input power is connected to the input anti-reverse soft start circuit, which can slowly raise the input voltage to prevent overshoot damage to the device and prevent voltage reverse connection damage to the device, then pass through the EMC (Electromagnetic Compatibility) filter circuit to filter out interference and charge the bus capacitor, pass through the phase-shifted full-bridge circuit with a clamping diode to complete the inverter work of the direct current, and the energy after inversion is transmitted to the secondary side through the isolation transformer with a center plug to complete the energy isolation transmission. The transformer secondary side is connected with the full-wave rectifier circuit to complete the rectification work of the output voltage, and the output filter circuit outputs stable direct current voltage. An isolation protection circuit is added between the output filter circuit and the direct current output circuit, which can prevent the backflow of the direct current output voltage. The low-voltage power supply circuit scheme is various and will not be specifically described here. The voltage power supply circuit generates various low-voltage power supplies of different potentials through conversion to meet the low-voltage power supply demand of the entire controller and supply power to the modules in the dashed box. The high-voltage side isolation sampling circuit samples the voltage across the bus capacitor and transmits the sampling signal to the main control chip MCU as the feedback signal of the entire control strategy; the main control chip MCU sends four-way drive signals, which are converted into four-way isolated drive signals by the single power transformer isolation drive circuit to drive the four MOS tubes in the phase-shifted full-bridge circuit to complete the inverter work; the main control chip sends two-way drive signals, which are directly driven by the drive circuit to complete the rectification work; the low-voltage side voltage sampling collects the direct current voltage, the low-voltage side current sampling collects the direct current, and the low-voltage side temperature sampling collects the temperature. The above collected signals are directly transmitted to the main control chip MCU as the feedback signal of the entire control system to complete the control of the entire system. The CAN communication circuit is directly connected with the main control chip to complete information interaction.

[0036] Preferably, the direct current output circuit comprises a direct current input end, an input anti-reverse soft start circuit, an electromagnetic compatibility filter circuit, a bus capacitor, a phase-shifted full-bridge circuit, an isolation transformer, a full-wave rectifier circuit, an output filter circuit, an isolation protection circuit and a direct current output end. The direct current input end is connected with the input anti-reverse soft start circuit, the input anti-reverse soft start circuit is connected with the electromagnetic compatibility filter circuit, the electromagnetic compatibility filter circuit is connected with the bus capacitor, the bus capacitor is connected with the phase-shifted full-bridge circuit, the phase-shifted full-bridge circuit is connected with the isolation transformer, the isolation transformer is connected with the full-wave rectifier circuit, the full-wave rectifier circuit is connected with the output filter circuit, the output filter circuit is connected with the isolation protection circuit, and the isolation protection circuit is connected with the direct current output end.

[0037] Optionally, the schematic diagram of the direct current output circuit of the present application is as follows Figure 3N-high positive, P-high negative, D0-diode, R1-third resistance, K1-relay, C1-first common mode capacitor, C2-second common mode capacitor, C3-first differential mode capacitor, L1-common mode inductor, C4-third common mode capacitor, C5-fourth common mode capacitor, C6-second differential mode capacitor, T1-isolation transformer, D1-first MOS tube, D2-second MOS tube, D3-third MOS tube, D4-fourth MOS tube, L2-resonant inductor, C7-first DC blocking capacitor, D5-first clamping diode, D6-second clamping diode, D7-fifth MOS tube, D8-sixth MOS tube, L3-filter capacitor, C8-filter inductor, R20 to R24-current sampling resistance. The specific filtering and DC / DC conversion steps include: the high-voltage DC power supply completes soft start through D0 and R1 and then closes the relay K1. First-order filtering is completed through C1, C2, C3 and L1; then second-order filtering is completed through C4, C5 and C6, and the filtered DC is converted by the phase-shifted full-bridge full-wave rectifier circuit. The four MOS tubes in the phase-shifted full-bridge circuit complete DC inversion, the resonant inductor resonates and stores energy to realize ZVS (Zero Voltage Switch, zero voltage switch) opening and closing, C7 can prevent transformer core saturation caused by DC bias magnetization, and D5-D6 can suppress the parasitic oscillation of the output rectifier tube from the root, and the voltage spike on the rectifier tube is greatly reduced. The full-wave rectifier circuit is composed of D7, D8, L3 and C8; R20-R24 are current sampling resistors in series, which are used to obtain the output current by measuring the voltage across them.

[0038] Preferably, the phase-shifted full-bridge circuit comprises a first MOS group, a second MOS group, a third MOS group, a fourth MOS group, a resonant inductor, a first DC blocking capacitor, a first clamping diode and a second clamping diode, the first MOS group and the second MOS group are connected in series to form a first branch, the third MOS group and the fourth MOS group are connected in series to form a second branch, the first branch and the second branch are connected in parallel, the first MOS group is connected to one end of the resonant inductor, the other end of the resonant inductor is connected to one end of the first DC blocking capacitor, the other end of the first DC blocking capacitor is connected to the isolation transformer, the negative electrode of the first clamping diode is connected to the MOS group, the positive electrode of the first clamping diode is connected to the negative electrode of the second clamping diode, and the positive electrode of the second clamping diode is connected to the fourth MOS group.

[0039] Preferably, any MOS group comprises a first resistance, a second resistance and a MOS tube, one end of the first resistance is connected to the signal output end of the single power transformer isolation drive circuit, the other end is connected to the gate of the MOS tube and one end of the second resistance, and the other end of the second resistance is connected to the drain of the MOS tube.

[0040] Preferably, the input anti-reverse soft start circuit comprises a diode, a third resistor and a relay, the positive electrode of the diode is connected with the DC input end, the negative electrode of the diode is connected with the third resistor in series to form a third branch, the third branch is connected in parallel with a fourth branch where the relay is located, and the third branch is used for controlling the forward DC input power supply to complete soft start.

[0041] Specifically, the soft start and anti-reverse circuit design is added in the input EMI circuit, and only one diode and resistor in series are needed to prevent reverse connection short circuit and ensure that the current slowly rises at the starting moment, prevent the current from rising instantaneously to cause current overshoot damage to the device, and suppress larger EMC interference.

[0042] After the high-voltage DC power supply at the input end completes soft start through a forward diode and a resistor, the relay is closed.

[0043] Preferably, the sampling circuit comprises a high-voltage side isolation voltage sampling circuit, a low-voltage side voltage sampling circuit, a current sampling circuit and a temperature sampling circuit, the high-voltage side isolation voltage sampling circuit is connected with the DC output circuit and the main control chip, the high-voltage side isolation voltage sampling circuit sends the circuit parameters collected from the DC output circuit to the main control chip, the low-voltage side voltage sampling circuit is connected with the DC output circuit and the main control chip, the low-voltage side voltage sampling circuit sends the circuit parameters collected from the DC output circuit to the main control chip, the current sampling circuit is connected with the DC output circuit and the main control chip, the current sampling circuit sends the circuit parameters collected from the DC output circuit to the main control chip, and the temperature sampling circuit is connected with the DC output circuit and the main control chip, and the temperature sampling circuit sends the circuit parameters collected from the DC output circuit to the main control chip.

[0044] The input DC power supply is filtered through the filtering EMC circuit, is inverted through the phase-shifted full-bridge circuit, transmits energy through the transformer, is rectified through the full-wave rectification circuit, and finally is filtered through the output filtering circuit to output a stable DC power supply. The phase-shifted full-bridge is driven through the isolation transformer, and the driving of the full-wave rectification can be directly performed through non-isolation direct driving. In the whole operation process, the voltage and the current are sampled and fed back to the main control chip MCU for operation and output of the phase-shifted logic driving signal to complete the DC / DC conversion.

[0045] Preferably, the current sampling circuit comprises a current sampling operational amplifier chip, the pin of the current sampling operational amplifier chip is connected with the DC output end of the DC output circuit, the current sampling operational amplifier chip is used for operational amplifying the output voltage collected from the DC output end to obtain an operational voltage signal and output the operational voltage signal to the main control chip, so that the main control chip obtains the output current through the operational voltage signal.

[0046] The application provides a circuit diagram of a current sampling circuit, as shown in Figure 4As shown, it comprises: U1-current sampling op-amp chip, C13-filtering capacitor, R25-output pull-down resistor, R26-output filtering resistor, C14-output filtering capacitor.

[0047] For example, based on the circuit diagram of the current sampling circuit, an embodiment is provided, which uses a dedicated current sampling op-amp chip U1 for op-amp processing. Compared with a self-built op-amp circuit, the precision is higher and the function is more integrated. R26 and C14 form an output filter circuit. The pin of the DC output end of the DC output circuit is connected to two pins of U1, so that the voltage signal within the fixed op-amp proportion output range of the chip can be output, and the corresponding current value can be obtained after processing by the main control chip.

[0048] Preferably, the single power transformer isolation driving circuit comprises an RC filter circuit and a power amplifier circuit, the RC filter circuit and the power amplifier circuit are connected, the RC filter circuit outputs the first driving signal after RC filtering, and the power amplifier circuit performs power amplification on the filtered first driving signal and outputs to the phase-shifted full-bridge circuit.

[0049] In the present application, the isolation transformer driving is used to replace the driving circuit composed of the flyback isolation power supply and the isolation driving chip, only one DC power supply is needed for power supply, which can effectively reduce the complexity and the number of devices of the isolation driving.

[0050] Preferably, the single power transformer isolation driving circuit further comprises a second DC blocking capacitor, the second DC blocking capacitor is connected with the power amplifier circuit, and the second DC blocking capacitor is used for suppressing DC bias magnetization.

[0051] Preferably, the single power transformer isolation driving circuit further comprises a plurality of TVS diodes, the plurality of TVS diodes are connected in parallel, and the plurality of TVS diodes are used for driving protection of the circuit.

[0052] The present application provides a circuit diagram of a single power transformer isolation driving circuit, as shown in Figure 5 As shown, it comprises: PWM1 to PWM4-a plurality of pulse width modulation signals, U3-first driving circuit, U4-second driving circuit, R16 to R19-filtering resistor, C9 to C10 and C13 to C14-filtering capacitor, C12 and C16-second DC blocking capacitor, D9 to D12-a plurality of TVS diodes, T2 and T3-transformer, DRIVE1 to DRIVE4-PWM driving signal.

[0053] For example, based on the above-mentioned single power transformer isolation driving circuit, an embodiment is provided, and R16-R19, C9-C10 and C13-C14 form a filter circuit, that is, the PWM signal is input to the IN pin of the driving circuit U2 and U3 through RC filtering for power amplification, and the output end generates two reverse PWM driving signals through the transformer to control the full-bridge circuit in the direct current output circuit, wherein C12 and C16 are direct current isolation capacitors, and the purpose is also to suppress direct current bias magnetization, and D9-D12 are TVS diodes, which play a driving protection role and prevent the damage of the MOS tube caused by the high driving voltage due to interference.

[0054] Figure 6 The schematic diagram of the phase-shift driving signal provided in the application is shown in the figure, DRIVE1 to DRIVE4 represent the phase-shift PWM signal, and the switching state of the MOS tube in the phase-shift full-bridge circuit is described, the zero voltage switching is turned on through phase shift, and the duty cycle is controlled through the size of the phase shift angle, and then the size of the output voltage is controlled.

[0055] Specifically, the application designs a single power driving vehicle DC / DC scheme with soft start, anti-reverse connection and prevention of direct current bias magnetism for a vehicle DC / DC converter. The soft start and anti-reverse connection circuit design is added in the input EMI circuit, only one diode and resistor in series are needed to prevent reverse connection short circuit and ensure that the current slowly rises at the starting moment, prevent the current from rising instantaneously to cause current overshoot damage to the device and suppress larger EMC interference; at the same time, the direct current isolation capacitor is added in the primary side of the transformer of the full-bridge circuit and the isolation driving, which can effectively suppress the transformer magnetic saturation, prevent the magnetic saturation from causing the coil to lose the inductance effect to cause the current to rise straightly and burn the device; at the same time, the single power isolation transformer driving design is used, the isolation transformer driving is used instead of the driving circuit composed of the flyback isolation power supply and the isolation driving chip, only one direct current power supply is needed, which can effectively reduce the complexity and the number of devices of the isolation driving.

[0056] According to one aspect of the embodiment of the application, the application provides a new energy vehicle adopting the single power isolation driving DCDC converter as described above.

[0057] The application discloses a single power supply isolation driving DCDC converter, which comprises a direct current driving circuit, a direct current output circuit and a direct current input circuit.

[0058] The application can be implemented by referring to the above-mentioned embodiments, and has corresponding technical effects.

[0059] It can be understood that the embodiments described herein can be implemented by hardware, software, firmware, middleware, microcode or a combination thereof. For hardware implementation, the processing unit can be implemented in one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), general purpose processors, controllers, microcontrollers, microprocessors, other electronic units for executing functions described herein or a combination thereof.

[0060] For software implementation, the technology described herein can be implemented by units performing functions described herein. The software code can be stored in a memory and executed by a processor. The memory can be implemented in the processor or outside the processor.

[0061] Those skilled in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the application.

[0062] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described system, device and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

[0063] If the functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the embodiments of the present application can be embodied in the form of software products in essence or the parts of the prior art or the parts of the technical solutions of the present application. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a ROM, a RAM, a magnetic disk or an optical disk, and various storage program codes. It should be noted that, in this paper, terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to the process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0064] The above is only a specific embodiment of the present application, so that those skilled in the art can understand or implement the present application. Various modifications of these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A single-supply isolated drive DCDC converter, characterized by, The application relates to a direct-current driving circuit and a direct-current output circuit. The direct-current driving circuit comprises a sampling circuit, a main control chip, a single-power-supply transformer isolation driving circuit and a rectification driving circuit. The sampling circuit is used for collecting circuit parameters in a direct-current voltage output process. The main control chip is used for respectively sending a first driving signal to the single-power-supply transformer isolation driving circuit and sending a second driving signal to the rectification driving circuit according to the circuit parameters. The single-power-supply transformer isolation driving circuit generates an inverter driving signal by using the first driving signal.

2. The transformer of claim 1, wherein, The rectification driving circuit generates a rectification driving signal by using the second driving signal. The direct-current output circuit is connected with the direct-current driving circuit and is used for inverting a direct-current power supply into an alternating-current power supply by using the inverter driving signal and rectifying the alternating-current power supply by using the rectification driving signal to output a stable target direct-current voltage. The direct-current output circuit comprises a direct-current input end, an input anti-reverse soft starting circuit, an electromagnetic compatibility filter circuit, a bus capacitor, a phase-shifted full-bridge circuit, an isolation transformer, a full-wave rectification circuit, an output filter circuit, an isolation protection circuit and a direct-current output end. The direct-current input end is connected with the input anti-reverse soft starting circuit. The input anti-reverse soft starting circuit is connected with the electromagnetic compatibility filter circuit. The electromagnetic compatibility filter circuit is connected with the bus capacitor. The bus capacitor is connected with the phase-shifted full-bridge circuit. The phase-shifted full-bridge circuit is connected with the isolation transformer. The isolation transformer is connected with the full-wave rectification circuit. The full-wave rectification circuit is connected with the output filter circuit. The output filter circuit is connected with the isolation protection circuit. The isolation protection circuit is connected with the direct-current output end. The phase-shifted full-bridge circuit comprises a first MOS group, a second MOS group, a third MOS group, a fourth MOS group, a resonance inductor, a first direct-current blocking capacitor, a first clamping diode and a second clamping diode. The first MOS group and the second MOS group are connected in series to form a first branch. The third MOS group and the fourth MOS group are connected in series to form a second branch. The first branch and the second branch are connected in parallel. One end of the first MOS group is connected with the resonance inductor. The other end of the resonance inductor is connected with one end of the first direct-current blocking capacitor. The other end of the first direct-current blocking capacitor is connected with the isolation transformer. The negative electrode of the first clamping diode is connected with the MOS group. The positive electrode of the first clamping diode is connected with the negative electrode of the second clamping diode. The positive electrode of the second clamping diode is connected with the fourth MOS group. Any MOS group comprises a first resistor, a second resistor and a MOS tube. One end of the first resistor is connected with a signal output end of the single-power-supply transformer isolation driving circuit. The other end of the first resistor is connected with the gate of the MOS tube and one end of the second resistor. The other end of the second resistor is connected with the drain of the MOS tube.

3. The transformer of claim 1, wherein, The input anti-reverse soft start circuit comprises a diode, a third resistor and a relay, the positive electrode of the diode is connected with the DC input end, the negative electrode of the diode is connected with the third resistor in series to form a third branch, the third branch is connected in parallel with a fourth branch where the relay is located, and the third branch is used for controlling the DC input power supply in the forward direction to complete soft start.

4. The transformer of claim 1, wherein, The sampling circuit comprises a high-voltage side isolation voltage sampling circuit, a low-voltage side voltage sampling circuit, a current sampling circuit and a temperature sampling circuit, the high-voltage side isolation voltage sampling circuit is connected with the DC output circuit and the master control chip, the high-voltage side isolation voltage sampling circuit sends the circuit parameters collected from the DC output circuit to the master control chip, the low-voltage side voltage sampling circuit is connected with the DC output circuit and the master control chip, the low-voltage side voltage sampling circuit sends the circuit parameters collected from the DC output circuit to the master control chip, the current sampling circuit is connected with the DC output circuit and the master control chip, the current sampling circuit sends the circuit parameters collected from the DC output circuit to the master control chip, and the temperature sampling circuit is connected with the DC output circuit and the master control chip, and the temperature sampling circuit sends the circuit parameters collected from the DC output circuit to the master control chip.

5. The transformer of claim 4, wherein, The current sampling circuit comprises a current sampling operational amplifier chip, the pins of the current sampling operational amplifier chip are connected with the DC output end of the DC output circuit, the current sampling operational amplifier chip is used for operational amplifying the output voltage of the DC output end collected, obtaining an operational voltage signal and outputting the operational voltage signal to the master control chip, so that the master control chip obtains the output current through the operational voltage signal.

6. The transformer of claim 1, wherein, The single-power transformer isolation driving circuit comprises an RC filter circuit and a power amplification circuit, the RC filter circuit and the power amplification circuit are connected, the RC filter circuit outputs the first driving signal after RC filtering, the power amplification circuit performs power amplification on the filtered first driving signal, and outputs the first driving signal to the phase-shifted full-bridge circuit.

7. The variator of claim 6, characterised in that, The single-power transformer isolation driving circuit further comprises a second direct-current isolation capacitor, the second direct-current isolation capacitor is connected with the power amplification circuit, and the second direct-current isolation capacitor is used for inhibiting direct-current magnetic bias.

8. The variator of claim 1, wherein, The single-power transformer isolation driving circuit further comprises a plurality of TVS diodes, the plurality of TVS diodes are connected in parallel, and the plurality of TVS diodes are used for driving protection of the circuit.

9. A new energy vehicle, characterized in that, The single-power isolation driving DCDC converter is adopted. The single-power transformer isolation driving circuit further comprises a second direct-current isolation capacitor, the second direct-current isolation capacitor is connected with the power amplification circuit, and the second direct-current isolation capacitor is used for inhibiting direct-current magnetic bias. The single-power transformer isolation driving circuit further comprises a plurality of TVS diodes, the plurality of TVS diodes are connected in parallel, and the plurality of TVS diodes are used for driving protection of the circuit. The single-power isolation driving DCDC converter is adopted.

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