CN219740030U

CN219740030U - Vehicle-mounted redundant power supply and electric automobile

Info

Publication number: CN219740030U
Application number: CN202320346373.9U
Authority: CN
Inventors: 郑彪; 王玉春; 刘灿昆; 张振兴
Original assignee: Zhejiang Geely Holding Group Co Ltd; Zhejiang Remote Commercial Vehicle R&D Co Ltd; Zhejiang Geely Remote New Energy Commercial Vehicle Group Co Ltd
Current assignee: Zhejiang Geely Holding Group Co Ltd; Zhejiang Remote Commercial Vehicle R&D Co Ltd; Zhejiang Geely Remote New Energy Commercial Vehicle Group Co Ltd
Priority date: 2023-02-20
Filing date: 2023-02-20
Publication date: 2023-09-22
Anticipated expiration: 2033-02-20

Abstract

The utility model discloses a vehicle-mounted redundant power supply and an electric automobile, wherein the vehicle-mounted redundant power supply comprises: the power supply switching signal input end is used for accessing a power supply switching signal; each power supply circuit comprises an EMI filter circuit, an input rectifying filter circuit, a PFC circuit and a power conversion circuit which are sequentially connected; the EMI filter circuit is used for outputting the accessed alternating current after EMI filtering; the input rectifying and filtering circuit is used for rectifying and filtering the accessed alternating current and outputting direct current; the PFC circuit is used for correcting the power factor of the direct current output by the input rectifying and filtering circuit and outputting the corrected direct current; the power conversion circuit is used for outputting the accessed direct current after power conversion; and the main controller is used for controlling a corresponding power conversion circuit to output the direct current after power conversion according to the power switching signal output by the power switching signal input end. The technical scheme of the utility model can improve the working efficiency of the redundant switching power supply.

Description

Vehicle-mounted redundant power supply and electric automobile

Technical Field

The utility model relates to the technical field of power supplies, in particular to a vehicle-mounted redundant power supply and an electric automobile.

Background

At present, an on-vehicle redundant power supply is arranged in an electric automobile so as to supply power to the electric automobile when the on-vehicle main power supply fails, but the existing on-vehicle redundant power supply has the problems of low working efficiency and serious heating.

Disclosure of Invention

The utility model mainly aims to provide a vehicle-mounted redundant power supply and aims to solve the problem of low working efficiency of the vehicle-mounted redundant power supply.

In order to achieve the above object, the present utility model provides a vehicle-mounted redundant power supply, including:

each power supply circuit comprises an EMI filter circuit, an input rectifying filter circuit, a PFC circuit and a power conversion circuit which are sequentially connected; the EMI filter circuit is used for outputting the accessed alternating current after EMI filtering; the input rectifying and filtering circuit is used for rectifying and filtering the accessed alternating current and outputting direct current; the PFC circuit is used for correcting the power factor of the direct current output by the input rectifying and filtering circuit and outputting the corrected direct current; the power conversion circuit is used for converting the accessed direct current into power and outputting the power; the method comprises the steps of,

the main controller is respectively connected with the controlled end of each power conversion circuit, and is used for controlling a corresponding power conversion circuit to output direct current after power conversion according to the power switching signal output by the power switching signal input end.

Optionally, the vehicle-mounted redundant power supply further includes:

the detection ends of the overvoltage and undervoltage protection circuit are connected with the input ends of the input rectifying and filtering circuits in a one-to-one correspondence manner so as to detect the input voltage of each input rectifying and filtering circuit; the output of the overvoltage and undervoltage protection circuit is connected with the main controller;

and the over-voltage and under-voltage protection circuit is used for outputting an input voltage protection signal to the main controller when the input voltage of the input rectifying and filtering circuit is over-voltage or under-voltage, so that the main controller controls each power conversion circuit to stop outputting direct current.

Optionally, each power supply circuit further comprises:

and the input ends of the output rectifying and filtering circuits are connected with the power conversion circuit, and each input rectifying and filtering circuit is used for outputting the input current after rectifying and filtering.

Optionally, each power supply circuit further comprises:

the power state detection circuit is characterized in that a plurality of detection ends of the power state detection circuit are connected with the output ends of the output rectifying and filtering circuits in a one-to-one correspondence manner, and the output of the power state detection circuit is connected with the main controller;

the power state detection circuit is used for detecting the output power of each output rectifying and filtering circuit and outputting corresponding output power detection signals to the main controller so that the main controller controls the power conversion circuit outputting direct current at present to work according to the received output power detection signals.

Optionally, each power supply circuit further comprises:

the detection end of the voltage stabilizing feedback circuit is connected with the output end of the output rectifying and filtering circuit, and the output end of the voltage stabilizing feedback circuit is connected with the main controller; the voltage stabilizing feedback circuit is used for outputting corresponding power adjusting signals to the main controller according to the output voltage of the output rectifying and filtering circuit;

the main controller is also used for controlling the power conversion circuit which outputs direct current to work according to the received power adjusting signal.

Optionally, the voltage stabilizing feedback circuit includes:

the input end of the voltage dividing circuit is a detection end of the voltage stabilizing feedback circuit;

and the first input end of the comparison circuit is connected with the output end of the voltage dividing circuit, the second input end of the comparison circuit is used for accessing reference voltage, and the output end of the comparison circuit is the output end of the voltage stabilizing feedback circuit.

Optionally, the voltage stabilizing feedback circuit further includes:

and the switch isolation circuit is connected between the output end of the comparison circuit and the main controller.

Optionally, the PFC circuit in each of the power supply circuits is the same PFC circuit.

The utility model also provides an electric automobile, which comprises the vehicle-mounted redundant power supply.

Optionally the electric automobile further comprises:

and the output ends of the vehicle-mounted main power supply and the vehicle-mounted redundant power supply are connected with each other.

According to the technical scheme, the power supply circuit is constructed by adopting the power supply switching signal input end, the multipath power supply circuit and the main controller and adopting the EMI filter circuit, the input rectifying filter circuit, the PFC circuit and the power conversion circuit which are sequentially connected, so that the direct current output by any power supply circuit in the vehicle-mounted redundant power supply can be more standard, the working efficiency and the output stability of the vehicle-mounted redundant power supply are improved, and the heat productivity of the vehicle-mounted redundant power supply is reduced due to higher efficiency on the premise of outputting direct current voltage with the same amplitude.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic block diagram of an embodiment of a vehicle-mounted redundant power supply of the present utility model;

FIG. 2 is a schematic block diagram of another embodiment of the redundant power supply of the present utility model;

FIG. 3 is a schematic circuit diagram of a voltage regulation feedback circuit in a further embodiment of the redundant power supply of the present utility model.

Reference numerals illustrate:

the achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

The utility model provides a vehicle-mounted redundant power supply.

Referring to fig. 1 to 2, in an embodiment, the in-vehicle redundant power supply includes:

the power supply switching signal input end is used for accessing a power supply switching signal;

a plurality of power supply circuits 100, each power supply circuit 100 including an EMI filter circuit 110, an input rectifying filter circuit 120, a PFC circuit 130, and a power conversion circuit 140 connected in sequence; the EMI filter circuit 110 is configured to output the ac power output by the input rectifying filter circuit 120 after EMI filtering; the input rectifying and filtering circuit 120 is configured to rectify and filter the ac power to output dc power; the PFC circuit 130 is configured to output the dc power after power factor correction; the power conversion circuit 140 is configured to convert the power of the accessed dc power and output the converted dc power; the method comprises the steps of,

and the main controller 200 is respectively connected with the power switching signal input end and the controlled end of each power conversion circuit 140, and the main controller 200 is used for controlling a corresponding power conversion circuit 140 to output power-converted direct current according to the power switching signal output by the power switching signal input end.

In the present embodiment of the present utility model,

EMI filter circuit 110 can be implemented using an inductive device construction. The input end of the EMI filter circuit 110 in each power supply circuit 100 can be respectively connected with the power supply input end of the vehicle-mounted redundant power supply so as to be connected with alternating current which is connected with the power supply input end through a live wire and a zero wire; the ac power may be obtained from an output of the engine, and will not be described herein. The EMI filter circuit 110 can utilize the characteristic of inductive load of the inductor to block the EMI interference from the live wire and the zero wire to the vehicle-mounted redundant power supply, so as to play a role in suppressing the surge and protecting the vehicle-mounted redundant power supply.

The input rectifying and filtering circuit 120 may include a filtering circuit and a rectifying circuit, where the filtering circuit may be implemented by using a capacitor device, and the rectifying circuit may be implemented by using a rectifying bridge formed by unidirectional conductive devices such as diodes. The input rectifying and filtering circuit 120 may perform common mode filtering and differential mode filtering on the ac power after EMI filtering to filter common mode interference signals and differential mode interference signals in the ac power, and then perform rectifying processing on the ac power to rectify the ac power into dc power and output the dc power. In another embodiment, the input rectifying and filtering circuit 120 may be connected to a dc power source, and the dc power source may be obtained from a battery output, which is not described herein.

PFC circuit 130 may be constructed from discrete devices and switching devices; the discrete device may include one or more of inductance, capacitance, diode, and resistance, and the switching device may be one or more of triode, MOS transistor, IGBT, and optocoupler U1, which are not limited herein. The PFC circuit 130 may have at least one controlled end, each controlled end may be connected to one PWM signal, and it may be understood that the PWM signal may have two level states, i.e., a high level state and a low level state, and when the PFC circuit 130 receives the PWM signal in one level state, it may connect the direct current to output a more standard direct current after being modulated by a discrete device; when receiving the PWM signal in another level state, the output of the direct current is stopped, so that the power factor correction of the direct current is realized. The PWM signal may be obtained by using a dedicated PWM controller output, such as UC3845, or may also be obtained by outputting from the main controller 200, which is not limited herein. It can be appreciated that the output direct current is more standard, i.e. the higher the operating efficiency of the vehicle-mounted redundant power supply.

The power conversion circuit 140 can be implemented by using discrete devices and switching device energy storage devices; alternatively, a dedicated power conversion chip may be used. The power conversion circuit 140 may have at least one controlled end, each controlled end may be connected to one path of PWM signal, and may control the switching frequency of the corresponding switching device to control the charging and discharging processes of the energy storage devices such as the inductor and the capacitor according to the connected PWM signal, so as to realize the output after the connected direct current increases the power; for example: the discharge of the capacitor can be controlled to be overlapped on the accessed direct-current voltage to increase the direct-current power; alternatively, the direct current power can be increased by controlling the inductor to discharge so as to confluence the discharging current of the inductor with the connected direct current. The power conversion circuit 140 may further control the corresponding switching device to be continuously turned on or turned off according to the accessed PWM signal, and may output the dc current to the ground when the switching device is turned on, so as to reduce the power of the accessed dc and output the dc current. It should be noted that, the vehicle-mounted redundant power supply further has a power output end, the power output ends of the vehicle-mounted redundant power supply and the vehicle-mounted main power supply are mutually interconnected, and the output end of each power conversion circuit 140 may be connected with the output end of the vehicle-mounted redundant power supply.

The main controller 200 can be a microprocessor such as MCU, DSP or FPGA; alternatively, the device can also be a special main control chip. The main controller 200 may have a plurality of PWM outputs, each of which may be connected to one controlled terminal of the power conversion circuit 140 to output a PWM signal to the power conversion circuit 140 in the corresponding power supply circuit 100. When the vehicle-mounted main power supply is not in fault, the main controller 200 can output PWM signals to control the power conversion circuit 140 in the preset power supply circuit 100 to work, so that the direct current output by the preset power supply circuit 100 can be used as the total output of the vehicle-mounted redundant power supply. At this time, the main controller 200 may control the power conversion circuits 140 in the other power supply circuits 100 to stop outputting the dc power by not providing the PWM signals required for the operation of the other power conversion circuits 140, in other words, the vehicle-mounted redundant power supply of the present utility model only has one power conversion circuit 140 to operate and output the dc power at each moment, that is, only one power supply circuit 100 provides the dc power for the power output terminal.

The vehicle-mounted redundant power supply may further be provided with a fault detection circuit dedicated for detecting whether the currently operating power supply circuit 100 is faulty, where the fault detection circuit may be connected to the power supply switching signal input end, and the fault detection circuit may output a power supply switching signal to the main controller 200 via the power supply switching signal input end when determining a fault, so as to trigger the main controller 200 to control the currently operating power conversion circuit 140 to stop operating, and control the power conversion circuit 140 in the other power supply circuit 100 to operate, thereby implementing switching of the power supply circuit 100 where the other power conversion circuit 140 is located to provide direct current for the power supply output end. It should be noted that, when the power conversion circuit 140 is in the inactive state, the power conversion circuit cannot form a current loop, but the input end of the EMI filter circuit 110 still has an ac voltage, so when one power conversion circuit 140 is switched to the active state, the power conversion circuit can immediately form a current loop, thereby realizing seamless switching to the power conversion circuit to output dc. In addition, each power conversion circuit may further have an operation parameter feedback function, so as to feedback and output a corresponding operation parameter feedback signal to the main controller 200 during operation, so that the main controller 200 may correspondingly adjust the duty ratio of the output PWM signal according to the received operation parameter feedback signal; the operating parameter feedback signal may include, but is not limited to, an output current feedback signal, an output voltage feedback signal, and an output power feedback signal, which are not limited herein. It should be noted that, in the embodiments shown in fig. 1 and fig. 2, the number of the power circuits 100 is 2, and in other embodiments, the number of the power circuits 100 may be more, for example, 3, 4, 5, etc., according to actual needs, and the present utility model is not limited herein.

According to the technical scheme, the power supply circuit 100 is constructed by adopting the multipath power supply circuit 100 and the main controller 200 and adopting the EMI filter circuit 110, the input rectifying filter circuit 120, the PFC circuit 130 and the power conversion circuit 140 which are sequentially connected, so that the direct current output by any one power supply circuit 100 in the vehicle-mounted redundant power supply can be more standard, the working efficiency and the output stability of the vehicle-mounted redundant power supply are improved, and the heat productivity of the vehicle-mounted redundant power supply is reduced due to higher efficiency on the premise of outputting direct current voltages with the same amplitude.

Referring to fig. 1 to 2, in an embodiment, the in-vehicle redundant power supply further includes:

the overvoltage and undervoltage protection circuit 300, wherein a plurality of detection ends of the overvoltage and undervoltage protection circuit 300 are connected with the input ends of the input rectifying and filtering circuits 120 in a one-to-one correspondence manner so as to detect the input voltage of each input rectifying and filtering circuit 120; the output of the over-voltage and under-voltage protection circuit 300 is connected with the main controller 200;

the over-voltage and under-voltage protection circuit 300 is configured to determine that when the input voltage of the input rectifying and filtering circuit 120 is over-voltage or under-voltage, output an input voltage protection signal to the main controller 200, so that the main controller 200 controls each of the power conversion circuits 140 to stop outputting dc power.

The over-voltage and under-voltage protection circuit 300 includes a multi-path voltage dividing circuit 161 and a comparison circuit 162; wherein each voltage divider circuit 161 may be implemented using a resistive device, and the comparison circuit 162 may be implemented using a discrete device and a comparator. Since only the current power supply circuit 100 outputting dc current forms a current loop, only the detection terminals connected to the current power supply circuit 100 of the overvoltage/undervoltage protection circuit 300 can detect the input voltage, and the voltage division circuit 161 divides the input voltage and outputs the divided voltage to the comparison circuit 162, so that the comparison circuit 162 can compare the divided input voltage with a corresponding preset reference voltage, and determine whether the input voltage of the input rectifying/filtering circuit 120 is overvoltage or undervoltage according to the comparison result. The method comprises the following steps: when the comparison result is larger than the corresponding preset reference voltage, determining the overvoltage of the input voltage; and when the comparison result is smaller than the corresponding preset reference voltage, determining that the input voltage is under-voltage. The preset reference voltage for determining the overvoltage and the preset reference voltage for determining the undervoltage can be the same voltage; alternatively, two different preset reference voltages may be used, which is not limited herein.

In this embodiment, the input voltage protection signal may be a high level signal or a low level signal, which is not limited herein. Taking the input voltage protection signal as a high level signal as an example, explaining the working principle of the overvoltage and undervoltage protection circuit 300 of the present utility model, the main controller 200 can control the currently working power circuit 100 to continue outputting direct current when receiving the low level signal output by the overvoltage and undervoltage protection circuit 300, so as to maintain the normal output of the vehicle-mounted redundant power supply; when receiving the high level signal output by the over-voltage and under-voltage protection circuit 300, the power conversion circuit 140 which is currently in operation is controlled to stop operating, and the rest of the power conversion circuits 140 are not controlled to operate, so that the vehicle-mounted redundant power supply stops outputting direct current. In this way, damage to each power supply circuit 100 caused by too high or too low input voltage can be avoided, so that input overvoltage and undervoltage protection for the vehicle-mounted redundant power supply is realized, and the service life of the vehicle-mounted redundant power supply is prolonged.

In another embodiment, the master control device may output the high voltage protection signal to the vehicle controller after receiving the input voltage protection signal, so that the vehicle controller may be switched to power battery for power supply.

Referring to fig. 1 to 2, in an embodiment, each power circuit 100 further includes:

the input ends of the output rectifying and filtering circuits 150 are connected to the power conversion circuit 140, and each of the input rectifying and filtering circuits 120 is configured to output an input current after rectifying and filtering.

The output rectifying and filtering circuit 150 may include a rectifying circuit and a filtering circuit. The output rectifying and filtering circuit 150 may rectify the pulsating dc after power conversion to obtain a more standard dc, and then perform filtering to further filter the ac signal, the common mode interference signal and the differential mode interference signal in the dc, and then output the dc. Therefore, the common mode interference signal, the differential mode interference signal or the alternating current signal can be effectively avoided from being reintroduced in the power conversion process of the direct current, and the improvement of the direct current purity of the output of the vehicle-mounted redundant power supply is facilitated.

a power state detection circuit 400, wherein a plurality of detection ends of the power state detection circuit 400 are connected with the output ends of the output rectifying and filtering circuits 150 in a one-to-one correspondence manner, and the output of the power state detection circuit 400 is connected with the main controller 200;

the power state detection circuit 400 is configured to detect an output power of each of the output rectifying and filtering circuits 150, and output a corresponding output power detection signal to the main controller 200, so that the main controller 200 controls the power conversion circuit 140 that outputs a current direct current to operate according to the received output power detection signal.

In this embodiment, the output power may be any one or more of output voltage, output current, and output power, so the power detection circuit may be implemented by using any one or more of a multi-path voltage detection circuit, a multi-path current detection circuit, and a multi-path power detection circuit. Since only the power supply circuit 100 currently outputting direct current forms a current loop, only the detection terminal connected to the currently operated power supply circuit 100 among the plurality of detection terminals of the power state detection circuit 400 can detect the output power and can output a corresponding output power detection signal to the main controller 200. It is understood that the output power detection signal may be any one or more of a current detection signal, a voltage detection signal and a power detection signal, which will not be described herein.

The main controller 200 may determine whether the output power of the currently operated output rectifying and filtering circuit 150 is abnormal according to the received output power detection signal, and may correspondingly adjust the duty ratio of the PWM signal output to the power conversion circuit 140 according to the determination result to adjust the power conversion rate of the currently operated power conversion circuit 140 in real time, thereby restoring the detected output power of the output rectifying and filtering circuit 150 to be normal. Wherein, the output power abnormality may include four cases of output undercurrent, output overcurrent, output undervoltage, output overvoltage, and the main controller 200 may correspondingly increase the duty ratio of PWM when determining that the abnormality of the output power is the output undercurrent and the output undervoltage, so as to restore the output power of the output rectifying and filtering circuit 150 to be normal by increasing the power conversion multiplying power; when it is determined that the abnormality of the output power supply is output overcurrent and output overvoltage, the duty ratio of the PWM is correspondingly reduced to return the output power supply of the output rectifying and filtering circuit 150 to normal by reducing the power conversion magnification. Thus, the output stability of the vehicle-mounted redundant power supply is improved.

the detection end of the voltage stabilizing feedback circuit 160 is connected with the output end of the output rectifying and filtering circuit 150, and the output end of the voltage stabilizing feedback circuit 160 is connected with the main controller 200; the voltage stabilizing feedback circuit 160 is configured to output a corresponding power adjustment signal to the main controller 200 according to the output voltage of the output rectifying and filtering circuit 150;

the main controller 200 is further configured to control the power conversion circuit 140 that currently outputs direct current to operate according to the received power adjustment signal.

Optionally, the voltage stabilizing feedback circuit 160 includes:

the voltage division circuit 161, wherein the input end of the voltage division circuit 161 is the detection end of the voltage stabilizing feedback circuit 160;

the first input end of the comparison circuit 162 is connected to the output end of the voltage dividing circuit 161, the second input end of the comparison circuit 162 is used for accessing a reference voltage, and the output end of the comparison circuit 162 is the output end of the voltage stabilizing feedback circuit 160.

Optionally, the voltage stabilizing feedback circuit 160 further includes:

and a switch isolation circuit 163, wherein the switch isolation circuit 163 is connected between the output end of the comparison circuit 162 and the main controller 200.

In this embodiment, the voltage stabilizing feedback circuit 160 may include a voltage dividing circuit 161, a comparing circuit 162 and a switch isolating circuit 163 connected in sequence. Referring to fig. 3, the voltage dividing circuit 161 may include a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a first capacitor C1, where a first end of the first resistor R1 is an input end of the voltage dividing circuit 161 and is also a detection end of the voltage stabilizing feedback circuit 160, and may be connected to an output end of the positive pole of the output rectifying and filtering circuit 150 to be connected to an output voltage thereof; the second end of the first resistor R1 is grounded through a first capacitor C1, a second resistor R2 and a third resistor R3 in sequence; the first end of the first resistor R1 is further grounded through a fourth resistor R4 and a fifth resistor R5 in sequence, wherein a common point of the first capacitor C1 and the second resistor R2 is an output end of the voltage dividing circuit 161.

The comparing circuit 162 may include a first operational amplifier A1, and the non-inverting terminal, the inverting terminal, and the output terminal of the first operational amplifier A1 may be a first input terminal, a second input terminal, and an output terminal of the comparing circuit 162, respectively.

The switching isolation circuit 163 may include a first switching device Q1, an optocoupler U1, and a sixth resistor R6; the first switching device Q1 may be one or more of a triode, a MOS transistor, a thyristor, a relay, and the like, which is not limited herein. The controlled end of the first switching device Q1 may be connected to the output end of the comparison circuit 162, the output end may be grounded, and the input end may be connected to the supply voltage sequentially through the primary side of the optocoupler U1 and the sixth resistor R6; the first end and the second end of the secondary side of the optocoupler U1 may be connected to the main controller 200, respectively, and the second end of the secondary side may be grounded.

In this way, when the output voltage Vo of the output rectifying and filtering circuit 150 increases, the voltage at the in-phase end of the first operational amplifier A1 increases after being divided by the first resistor R1, the second resistor R2, the fourth resistor R4 and the fifth resistor R5, and when the voltage exceeds the reference voltage connected to the inverting end of the first operational amplifier A1, the first operational amplifier A1 outputs a high-level signal to turn on the first switching device Q1, the light emitting diode in the optocoupler U1 emits light and the internal phototransistor thereof is turned on, and the voltage value at the first end of the secondary side of the optocoupler U1 correspondingly decreases. The main controller 200 may correspondingly reduce the duty ratio of the PWM signal output to the currently operating power conversion circuit 140 when detecting that the pin potential connected to the first end of the optocoupler U1 decreases, so that the output voltage Vo of the output rectifying and filtering circuit 150 becomes low;

when the output voltage Vo of the output rectifying and filtering circuit 150 decreases, the voltage at the non-inverting terminal of the first operational amplifier A1 decreases, and after the voltage is lower than the reference voltage connected to the inverting terminal of the first operational amplifier A1, the first operational amplifier A1 outputs a low-level signal to make the first switching device Q1 non-conductive, the light emitting diode inside the optocoupler U1 does not emit light and the phototransistor inside the optocoupler U1 is non-conductive, and the voltage value at the first terminal of the secondary side of the optocoupler U1 increases. The main controller 200 may correspondingly increase the duty ratio of the PWM signal output to the currently operating power conversion circuit 140 when detecting the increase of the pin potential connected to the first terminal of the optocoupler U1, so that the output voltage Vo of the output rectifying and filtering circuit 150 increases accordingly. The output voltage is kept stable for maintaining the voltage.

In addition, the third resistor R3 may be a variable resistor, and by adjusting the resistance of the third resistor R3, the voltage dividing ratio of the voltage dividing circuit 161 may be changed, so as to change the stable value maintained by the output voltage V0.

Referring to fig. 2, in an embodiment, the PFC circuit 130 in each of the power supply circuits 100 is the same PFC circuit 130.

In this embodiment, the PFC circuit 130 may have a plurality of input terminals and a plurality of output terminals, each input terminal corresponds to an output terminal, each input terminal may be connected to an output terminal of the input rectifying and filtering circuit 120 in the power circuit 100, and each output terminal may be connected to an input terminal of the power conversion circuit 140 in the power circuit 100. Therefore, when the power conversion circuit 140 is switched, the PFC circuit 130 may also switch to the corresponding input to access the ac power, and output the dc power corrected by the power factor to the power conversion circuit 140 after switching, so as to implement multiplexing of the multiple power circuits 100 with one PFC circuit 130. By the arrangement, the output waiting time of the power circuit 100 working after switching can be saved, and seamless switching is facilitated.

The utility model also provides an electric automobile, which comprises a vehicle-mounted redundant power supply, and the specific structure of the vehicle-mounted redundant power supply refers to the embodiment, and because the electric automobile adopts all the technical schemes of all the embodiments, the electric automobile at least has all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted herein.

Optionally, the electric automobile further includes:

The vehicle-mounted main power supply and the vehicle-mounted redundant power supply can be arranged in the vehicle-mounted power supply system, and the output ends of the vehicle-mounted main power supply and the vehicle-mounted redundant power supply are connected with each other to serve as the output end of the vehicle-mounted power supply system. The vehicle-mounted power supply system can further comprise a power supply management system, and the power supply management system can control the vehicle-mounted main power supply to output direct-current voltage to serve as the output voltage of the vehicle-mounted power supply system when the vehicle-mounted main power supply is normal, and control the vehicle-mounted redundant power supply not to output direct-current voltage at the moment; when the vehicle-mounted main power supply fails, the vehicle-mounted main power supply is controlled to stop working, and the vehicle-mounted redundant power supply automatically takes over the output direct-current voltage of the vehicle-mounted main power supply to serve as the output voltage of the vehicle-mounted power supply system, so that uninterrupted power supply of the vehicle-mounted power supply system is realized.

The foregoing description is only of the optional embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all the equivalent structural changes made by the description of the present utility model and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims

1. An in-vehicle redundant power supply, comprising:

the main controller is respectively connected with the power supply switching signal input end and the controlled end of each power conversion circuit, and is used for controlling a corresponding power conversion circuit to output direct current after power conversion according to the power supply switching signal output by the power supply switching signal input end.

2. The in-vehicle redundant power supply of claim 1, further comprising:

3. The vehicle-mounted redundant power supply of claim 2, wherein each power supply circuit further comprises:

4. A redundant power supply for a vehicle as set forth in claim 3, wherein each power supply circuit further comprises:

5. A redundant power supply for a vehicle as set forth in claim 3, wherein each power supply circuit further comprises:

6. The vehicle-mounted redundant power supply of claim 5 wherein the voltage regulation feedback circuit comprises:

7. The vehicle-mounted redundant power supply of claim 5 wherein the voltage regulator feedback circuit further comprises:

and the switch isolation circuit is connected between the output end of the comparison circuit of the vehicle-mounted redundant power supply and the main controller.

8. The vehicle-mounted redundant power supply of any one of claims 1-7, wherein the PFC circuit in each of the power supply circuits is the same PFC circuit.

9. An electric vehicle, characterized in that it comprises a redundant power supply for vehicles according to any one of claims 1 to 8.

10. The electric vehicle of claim 9, characterized in that the electric vehicle further comprises: