CN111204221B - Power supply circuit and method of high-voltage controller of electric automobile and electric automobile - Google Patents
Power supply circuit and method of high-voltage controller of electric automobile and electric automobile Download PDFInfo
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- CN111204221B CN111204221B CN202010187757.1A CN202010187757A CN111204221B CN 111204221 B CN111204221 B CN 111204221B CN 202010187757 A CN202010187757 A CN 202010187757A CN 111204221 B CN111204221 B CN 111204221B
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 54
- 230000002159 abnormal effect Effects 0.000 claims description 7
- 238000002955 isolation Methods 0.000 description 8
- 238000004146 energy storage Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 230000001052 transient effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000013500 data storage Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
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Abstract
The invention provides a power supply circuit and a method of a high-voltage controller of an electric automobile and the electric automobile, wherein the power supply circuit comprises a high-voltage power supply branch, a low-voltage power supply branch and a voltage conversion circuit, and the high-voltage power supply branch comprises a first voltage converter and a first unidirectional conduction device which are connected with the output end of the high-voltage battery; the low-voltage power supply branch circuit comprises a second unidirectional conduction device connected between the output end of the low-voltage battery and the input end of the voltage conversion circuit; the voltage conversion circuit comprises a second voltage converter; before the high-voltage is not established, the first voltage is supplied to the second voltage converter by the first unidirectional conduction device through the first unidirectional conduction device, and the first voltage is converted into a power supply voltage through the second voltage converter to supply power to the high-voltage component; after the high-voltage is established, a second voltage is provided for the second voltage converter through the first unidirectional conduction device, the second voltage is larger than the first voltage, the second unidirectional conduction device is reversely cut off, and the second voltage is converted into a power supply voltage through the second voltage converter to supply power to the high-voltage component.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a power supply circuit and method of a high-voltage controller of an electric automobile and the electric automobile.
Background
The electric automobile is a vehicle which uses a vehicle-mounted power supply as power and uses a motor to drive wheels to run and meets various requirements of road traffic and safety regulations. With the increasing concern of society for environmental problems, electric automobiles have been widely used on a large scale. In contrast to conventional automobiles, electric drive and control systems are the core of electric automobiles, in which high-voltage components involved are all powered by high voltages, such as motor controllers, DC-DC converters, oil pump controllers, air pump controllers, insulation detectors, and the like.
The power supply circuit of these high-voltage components generally adopts the method of providing a low-voltage power supply circuit, and the adoption of the method can complete self-checking by the controller before the high-voltage is established, but has the defects that an isolation circuit is required to be added for collecting high-voltage and current, a filter circuit is required to be added for reducing low-voltage conduction, and an energy storage circuit is required to be added for meeting the voltage drop required by vehicle-mounted equipment, so that the system cost of the electric automobile is greatly increased.
Disclosure of Invention
In order to solve the existing technical problems, the embodiment of the invention provides a power supply circuit and method of an electric vehicle high-voltage controller, and an electric vehicle, wherein the power supply circuit and method are simple in structure and lower in cost.
The power supply circuit of the high-voltage controller of the electric automobile comprises a high-voltage power supply branch, an auxiliary power supply branch connected with the high-voltage power supply branch in parallel and a voltage conversion circuit connected with the high-voltage power supply branch, wherein the high-voltage power supply branch comprises a first voltage converter connected with an output end of a high-voltage battery and a first unidirectional conduction device connected between the output end of the first voltage converter and an input end of the voltage conversion circuit; the auxiliary power supply branch is a low-voltage power supply branch and comprises a second unidirectional conduction device connected between the output end of the low-voltage battery and the input end of the voltage conversion circuit; the voltage conversion circuit comprises a second voltage converter;
before the high-voltage power supply branch circuit outputs high-voltage to the second voltage converter, the high-voltage power supply branch circuit provides first voltage to the second voltage converter through the second unidirectional conduction device, and the first voltage is converted into power supply voltage through the second voltage converter to supply power to the high-voltage component;
after the high-voltage output by the high-voltage power supply branch to the second voltage converter is established, a second voltage is provided for the second voltage converter through the first unidirectional conduction device, the second voltage is larger than the first voltage, the second unidirectional conduction device is reversely cut off, and the second voltage is converted into a power supply voltage through the second voltage converter to supply power to the high-voltage component.
Wherein the conduction voltage of the first unidirectional conduction device is greater than the conduction voltage of the second unidirectional conduction device.
The output end of the first unidirectional conduction device is connected with the output end of the second unidirectional conduction device to form a node, and the node is connected with the input end of the second voltage converter.
When the high-voltage power supply branch is disconnected or the output is abnormal, the first voltage provided by the low-voltage power supply branch to the second voltage converter through the second unidirectional conduction device is larger than the output voltage provided by the high-voltage power supply branch to the second voltage converter, the first unidirectional conduction device is cut off, and the first voltage is converted into the power supply voltage through the second voltage converter.
The power supply circuit of the high-voltage controller of the electric automobile comprises a high-voltage power supply branch, an auxiliary power supply branch connected with the high-voltage power supply branch in parallel and a voltage conversion circuit connected with the high-voltage power supply branch, wherein the high-voltage power supply branch comprises a first voltage converter connected with an output end of a high-voltage battery and a first unidirectional conduction device connected between the output end of the first voltage converter and an input end of the voltage conversion circuit; the auxiliary power supply branch is a low-voltage power supply branch and comprises a second unidirectional conduction device connected between the output end of the low-voltage battery and the input end of the voltage conversion circuit; the voltage conversion circuit comprises a second voltage converter;
the power supply circuit is switched between different working states according to the output of the high-voltage power supply branch circuit, and the working states comprise at least two of the following:
the first working state is that before the high-voltage power supply branch circuit outputs high-voltage to the second voltage converter, the first voltage is supplied to the second voltage converter through the second unidirectional conduction device by the low-voltage power supply branch circuit, and the first voltage is converted into power supply voltage through the second voltage converter to supply power to the high-voltage component;
the second working state is that after the high-voltage output by the high-voltage power supply branch to the second voltage converter is established, the high-voltage power supply branch provides a second voltage to the second voltage converter through the first unidirectional conduction device, the second voltage is larger than the first voltage, the second unidirectional conduction device is reversely cut off, and the second voltage is converted into a power supply voltage through the second voltage converter to supply power to the high-voltage component;
and in a third working state, when the high voltage output by the high voltage power supply branch to the second voltage converter drops abnormally, the first voltage provided by the high voltage power supply branch to the second voltage converter through the second unidirectional conduction device is larger than the output voltage of the high voltage power supply branch to the second voltage converter, the first unidirectional conduction device is reversely cut off, and the first voltage is converted into a power supply voltage through the second voltage converter to supply power to the high voltage component.
Wherein the turn-on voltage of the first unidirectional conduction device is greater than that of the second unidirectional conduction device.
The output end of the first unidirectional conduction device is connected with the output end of the second unidirectional conduction device to form a node, and the node is connected with the input end of the second voltage converter.
The power supply circuit comprises a high-voltage power supply branch, an auxiliary power supply branch connected with the high-voltage power supply branch in parallel, and a voltage conversion circuit connected with the high-voltage power supply branch, wherein the auxiliary power supply branch is the high-voltage power supply branch, and the method comprises the following steps:
when the first voltage output by the high-voltage power supply branch circuit to the voltage conversion circuit is larger than the second voltage output by the low-voltage power supply branch circuit to the voltage conversion circuit, the high-voltage power supply branch circuit is provided with the second voltage, the high-voltage power supply branch circuit is conducted, the low-voltage power supply branch circuit is reversely cut off, and the second voltage is converted into a power supply voltage by the voltage conversion circuit to supply power to the high-voltage component;
when the first voltage is smaller than the second voltage, the high-voltage power supply branch is reversely cut off, the low-voltage power supply branch is conducted, and the first voltage is converted into a power supply voltage through the voltage conversion circuit to supply power to the high-voltage component.
When the electric automobile is started, the low-voltage power supply branch circuit provides a second voltage for the voltage conversion circuit, and the second voltage is converted into a power supply voltage by the voltage conversion circuit to supply power to the high-voltage component, so that the high-voltage controller triggers the high-voltage power supply branch circuit to establish a first voltage output to the voltage conversion circuit after self-checking is finished.
An electric automobile comprises a power supply circuit of the electric automobile high-voltage controller provided by the embodiment of the application.
In the embodiment of the invention, the power supply of the high-voltage component comprises a high-voltage power supply branch and an auxiliary power supply branch connected in parallel with the high-voltage power supply branch, wherein before the high-voltage power supply branch does not establish the high-voltage output by the high-voltage power supply branch to the second voltage converter, the first voltage is provided to the second voltage converter through the second unidirectional conduction device, and the first voltage is converted into the power supply voltage through the second voltage converter to supply power to the high-voltage component; after the high-voltage output by the high-voltage power supply branch to the second voltage converter is established, providing a second voltage to the second voltage converter through the first unidirectional conduction device, wherein the second voltage is larger than the first voltage, the second unidirectional conduction device is reversely cut off, and the second voltage is converted into a power supply voltage through the second voltage converter to supply power to the high-voltage component; the conventional power supply of the low-voltage power supply loop of the high-voltage component is placed at the high-voltage side, so that the load voltage and the load current can be directly collected without isolation, an isolation circuit is omitted, and the cost is reduced; the low-voltage power supply circuit of the high-voltage controller of the electric automobile is powered by the low-voltage power supply branch and the high-voltage power supply branch simultaneously, the high-voltage power supply branch and the low-voltage power supply branch are switched smoothly, the low-voltage power supply branch can supply power before the high voltage is built, the high-voltage component can store data, the whole automobile requirement is met, the low-voltage power supply branch does not supply power after the high voltage is built, the requirement of a voltage battery in the voltage transient drop can be reduced, and the energy storage circuit is omitted, so that the cost is reduced. The power supply circuit of the high-voltage controller of the electric automobile is simple in design and easy to realize, and the system cost of the electric automobile is effectively reduced.
Drawings
Fig. 1 is a topology diagram of a power supply circuit of a known high voltage controller of an electric vehicle;
fig. 2 is a topology diagram of a power supply circuit of a high voltage controller of an electric vehicle according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a power supply circuit of a high voltage controller of an electric vehicle according to an embodiment of the present invention;
fig. 4 is a flowchart of a power supply method of a high voltage controller of an electric vehicle according to an embodiment of the invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. Other embodiments of variations or alternatives will readily occur to those of ordinary skill in the art based on the embodiments of the invention and are within the scope of the invention.
For electric vehicles, most of the newly added components are high-voltage components, such as a motor controller, a DC/DC converter, an oil pump controller, an air pump controller, an insulation detector and the like. These controller control circuits typically draw power from the low voltage side and boost the power to drive the high voltage components, such as by using the power topology of the low voltage power supply loop shown in fig. 1. However, the scheme needs to add an isolation circuit for collecting high-voltage UH and current, a filter circuit for reducing low-voltage conduction and an energy storage circuit for meeting the voltage drop requirement of vehicle-mounted equipment, and the cost of the system of the electric automobile is greatly increased.
In order to solve the above-mentioned problems, the embodiment of the present application provides a power supply circuit of a high-voltage controller of an electric automobile, in which a low-voltage power supply loop of a high-voltage component is placed on a high-voltage side, the low-voltage power supply loop is powered by two power supply branches, namely, a low-voltage power supply branch 20 and a high-voltage power supply branch 10, and the power supply circuit can be powered by the low-voltage power supply branch 20 before the high voltage is not established or when the high voltage is disconnected or output is abnormal by smoothly switching between the high-voltage power supply branch 10 and the high-voltage power supply branch 20; when the high voltage is established, power is supplied by the high voltage power supply branch 10. Referring to fig. 2, a topology diagram of a power supply circuit of a high voltage controller of an electric vehicle according to an embodiment of the present application is provided, the power supply circuit includes a high voltage power supply branch 10, an auxiliary power supply branch connected in parallel with the high voltage power supply branch 10, and a voltage conversion circuit 30 connected to the high voltage power supply branch 10, the high voltage power supply branch 10 includes a first voltage UH1 converter T1 connected to an output end of a high voltage battery, and a first unidirectional conduction device D1 connected between an output end of the first voltage UH1 converter T1 and an input end of the voltage conversion circuit 30; the auxiliary power supply branch is a low-voltage power supply branch 20 and comprises a second unidirectional conduction device D2 connected between the output end of the low-voltage battery and the input end of the voltage conversion circuit 30; the voltage conversion circuit 30 includes a second voltage UL1 converter T2; before the high-voltage power supply branch 10 outputs the high-voltage UH to the second voltage UL1 converter T2, the high-voltage power supply branch 20 provides a first voltage UH1 to the second voltage UL1 converter T2 through the second unidirectional conduction device D2, and the first voltage UH1 is converted into a supply voltage UB to supply power to a high-voltage component through the second voltage UL1 converter T2; after the high-voltage power supply branch 10 establishes the high-voltage UH output by the second voltage UL1 converter T2, a second voltage UL1 is provided to the second voltage UL1 converter T2 through the first unidirectional conduction device D1, the second voltage UL1 is greater than the first voltage UH1, the second unidirectional conduction device D2 is turned off reversely, and the second voltage UL1 is converted into a supply voltage UB to supply power to the high-voltage component through the second voltage UL1 converter T2.
The first voltage UH1 converter in the high-voltage power supply branch 10 and the second voltage UL1 converter in the voltage conversion circuit 30 are connected in series, the low-voltage power supply branch 20 and the high-voltage power supply branch 10 are connected in parallel, an input end of the first unidirectional conduction device D1 is connected with an output end of the first voltage UH1 converter, an output end of the first unidirectional conduction device D1 is connected with an output end of the second unidirectional conduction device D2 to form a node, and the node is connected with an input end of the second voltage UL1 converter. The input end of the first voltage UH1 converter is connected with a high-voltage battery, the input voltage of the high-voltage power supply branch circuit 10 is high voltage UH, and after being converted by the first voltage UH1 converter, the first voltage output to the second voltage UL1 converter through the first unidirectional current device D1 is UH1. The input end of the second unidirectional conduction device D2 is connected to the low-voltage battery, the input voltage of the low-voltage power supply branch 20 is the low voltage UL, and the second voltage output to the second voltage UL1 converter via the second unidirectional conduction device D2 is UL1. When the electric automobile is just started or the high voltage is abnormally disconnected and repaired, before the high voltage UH output by the high voltage power supply branch 10 to the second voltage UL1 converter T2 is not established, the first voltage UH1 is smaller than the second voltage UL1, the first unidirectional conduction device D1 is turned off, the second unidirectional conduction device D2 is turned on, and the second voltage UL1 converter converts the second voltage UL1 as an input voltage to form a supply voltage UB to supply power to the high voltage component. The high voltage component may be a high voltage controller driven by high voltage, such as an oil pump controller, etc., in the embodiment of the present application, the power is supplied by the low voltage power supply branch 20 before the high voltage is established, and the high voltage controller may complete the self-test by the supply voltage UB obtained based on the power supply of the low voltage power supply branch 20. The first unidirectional conduction device D1 and the second unidirectional conduction device D2 may be diodes, the anode of each diode is an input end, and the cathode is an output end; alternatively, the unidirectional conduction device may be another controllable switch tube, such as a MOS tube, an IGBT, or the like, which is controlled to be unidirectional by a driving signal.
After the high-voltage power supply branch 10 establishes the high-voltage UH output to the second voltage UL1 converter T2, the first voltage UH1 is greater than the second voltage UL1, the first unidirectional conduction device D1 is turned on, the second unidirectional conduction device D2 is turned off, and the second voltage UL1 converter converts the first voltage UH1 as an input voltage to form a supply voltage UB to supply power to the high-voltage component.
The power supply circuit provided by the embodiment of the invention places the conventional power supply of the low-voltage power supply loop of the high-voltage component at the high-voltage side, so that the load voltage and the load current can be directly collected without isolation, and an isolation circuit is omitted to reduce the cost; the low-voltage power supply circuit of the electric automobile high-voltage controller is powered by the low-voltage power supply branch circuit and the high-voltage power supply branch circuit simultaneously, the high-voltage power supply branch circuit 10 and the low-voltage power supply branch circuit 20 are switched smoothly, the low-voltage power supply branch circuit 20 can supply power before the high voltage is built, the high-voltage components can store data, the whole automobile requirement is met, the low-voltage power supply branch circuit 20 is not powered after the high voltage is built, the requirement of a voltage battery in voltage transient drop can be reduced, and an energy storage circuit is omitted so that the cost is further reduced. The power supply circuit of the high-voltage controller of the electric automobile is simple in design and easy to realize, and the system cost of the electric automobile is effectively reduced.
In some embodiments, the power supply circuit further comprises: when the high-voltage power supply branch 10 is disconnected or the output is abnormal, the first voltage UH1 provided by the low-voltage power supply branch 20 to the second voltage UL1 converter through the second unidirectional current-conducting device D2 is greater than the output voltage of the high-voltage power supply branch 10 to the second voltage UL1 converter, the first unidirectional current-conducting device D1 is turned off, and the first voltage UH1 is converted into a supply voltage UB through the second voltage UL1 converter.
In the normal running process of the electric automobile, once the high-voltage UH output by the high-voltage battery is abnormal, the low-voltage battery is started up if the high-voltage battery is disconnected or the high-voltage UH output by the high-voltage battery is not in a required range, the low-voltage battery outputs a low-voltage UL, and the low-voltage UL provides a second voltage UL1 to a second voltage UL1 converter after passing through a second unidirectional conducting device D2. Because the high-voltage battery is abnormal, the first voltage UH1 provided by the high-voltage battery to the second voltage UL1 converter is smaller than the second voltage UL1, the output end of the first unidirectional conduction device D1 is at a high potential, the input end of the first unidirectional conduction device D1 is at a low potential, the first unidirectional conduction device D1 is cut off, at the moment, the second unidirectional conduction device D2 is conducted, and the second voltage UL1 converter takes the second voltage UL1 as an input voltage to convert into a supply voltage UB to supply power to the high-voltage component.
Wherein, the conduction voltage of the first unidirectional conduction device D1 is greater than the conduction voltage of the second unidirectional conduction device D2. The output end of the first unidirectional conduction device D1 is connected with the output end of the second unidirectional conduction device D2 to form a node, and the node is connected with the input end of the second voltage UL1 converter T2. By means of the parallel design of the high-voltage power supply branch 10 and the low-voltage power supply branch 20, the low-voltage power supply loop of the high-voltage controller of the electric automobile is powered by the low-voltage power supply branch and the high-voltage power supply branch simultaneously, and the high-voltage power supply branch 10 and the high-voltage power supply branch 20 can be automatically and smoothly switched according to the power supply condition of the high-voltage side, so that at least the following technical effects can be brought:
firstly, the conventional power supply of the low-voltage power supply loop of the high-voltage controller is placed at the high-voltage side, so that load voltage and load current can be directly collected without isolation, an isolation circuit is omitted, and the system cost is reduced;
secondly, the high-voltage power supply branch circuit 10 and the low-voltage power supply branch circuit 20 can be switched smoothly, so that data storage of a high-voltage controller can be avoided when high voltage is not established or accidentally dropped, and the safety and stability requirements of the whole vehicle are met;
thirdly, after the high voltage is established, the power supply of the high voltage controller is not supplied by the low voltage power supply branch 20 any more, so that the low voltage conduction requirement of the controller can be reduced, an expensive filter circuit is omitted, and the cost is reduced;
fourth, after the high voltage is established, the power supply of the high voltage controller is not supplied by the low voltage power supply branch 20 any more, so that the requirement of the voltage battery in the voltage transient drop can be reduced, the energy storage circuit is omitted, and the system cost is reduced.
In another aspect of the present application, a power supply circuit of a high voltage controller of an electric automobile is further provided, including a high voltage power supply branch 10, an auxiliary power supply branch connected in parallel with the high voltage power supply branch 10, and a voltage conversion circuit 30 connected with the high voltage power supply branch 10, where the high voltage power supply branch 10 includes a first voltage UH1 converter T1 connected with an output end of a high voltage battery, and a first unidirectional conductive device D1 connected between the output end of the first voltage UH1 converter T1 and an input end of the voltage conversion circuit 30; the auxiliary power supply branch is a low-voltage power supply branch 20 and comprises a second unidirectional conduction device D2 connected between the output end of the low-voltage battery and the input end of the voltage conversion circuit 30; the voltage conversion circuit 30 includes a second voltage UL1 converter T2;
the power supply circuit switches between different working states according to the output of the high-voltage power supply branch 10, wherein the working states comprise at least two of the following:
in the first operating state, before the high-voltage power supply branch 10 outputs the high-voltage UH to the second voltage UL1 converter T2, the low-voltage power supply branch 20 provides the first voltage UH1 to the second voltage UL1 converter T2 through the second unidirectional conduction device D2, and the first voltage UH1 is converted into the power supply voltage UB to supply power to the high-voltage component through the second voltage UL1 converter T2;
in the second working state, after the high-voltage power supply branch 10 builds the high-voltage UH output by the high-voltage power supply branch 10 to the second voltage UL1 converter T2, the high-voltage power supply branch 10 provides a second voltage UL1 to the second voltage UL1 converter T2 through the first unidirectional current-conducting device D1, the second voltage UL1 is greater than the first voltage UH1, the second unidirectional current-conducting device D2 is reversely cut off, and the second voltage UL1 is converted into a power supply voltage UB to supply power to a high-voltage component through the second voltage UL1 converter T2;
in the third operating state, when the high-voltage power supply branch 10 outputs the high-voltage UH to the second voltage UL1 converter T2 and drops abnormally, the first voltage UH1 provided by the high-voltage power supply branch 20 to the second voltage UL1 converter T2 through the second unidirectional conduction device D2 is greater than the output voltage of the high-voltage power supply branch 10 to the second voltage UL1 converter T2, the first unidirectional conduction device D1 is turned off reversely, and the first voltage UH1 is converted into the power supply voltage UB to supply power to the high-voltage component through the second voltage UL1 converter T2.
Wherein, the conduction voltage of the first unidirectional conduction device D1 is larger than that of the second unidirectional conduction device D2. The output end of the first unidirectional conduction device D1 is connected with the output end of the second unidirectional conduction device D2 to form a node, and the node is connected with the input end of the second voltage UL1 converter T2.
In the power supply circuit of the high-voltage controller of the electric vehicle provided in the foregoing embodiment, before the high-voltage power supply branch 10 pointed by the first working state outputs the high-voltage UH to the second voltage UL1 converter T2, the power supply circuit may be referred to when the electric vehicle starts or in a process of recovering after the high voltage is disconnected or falls abnormally in a use process of the electric vehicle. Before the high-voltage circuit UH is not established, the second voltage UL1 provided by the low-voltage power supply branch 20 to the second voltage UL1 converter T2 is larger than the first voltage UH1 provided by the high-voltage power supply branch 10 to the second voltage UL1 converter T2, the first unidirectional conduction device D1 is reversely cut off, and the second unidirectional conduction device D2 is conducted, so that the low-voltage power supply circuit of the high-voltage component is powered by the low-voltage power supply branch 20, the high-voltage controller can complete self-checking through a power supply voltage UB obtained based on the power supply of the low-voltage power supply branch 20, and operation data of the high-voltage controller can be normally stored, thereby ensuring the safety and normal operation of the whole vehicle.
After the high voltage UH output by the high voltage power supply branch 10 to the second voltage UL1 converter T2 in the second operating state is established, the operating state may be a normal operating process after the electric automobile is started. After the high-voltage UH is established, the second voltage UL1 provided by the high-voltage power supply branch 20 to the second voltage UL1 converter T2 is smaller than the first voltage UH1 provided by the high-voltage power supply branch 10 to the second voltage UL1 converter T2, the second unidirectional conduction device D2 is reversely cut off, and the first unidirectional conduction device D1 is conducted, so that a low-voltage power supply loop of the high-voltage component is automatically switched to be powered by the high-voltage power supply branch 10, the power supply of the high-voltage controller is not powered by the low-voltage power supply branch 20 any more, the requirement of low-voltage conduction of the controller can be reduced, an expensive filter circuit is saved, and the cost is reduced; and the power supply of the high-voltage controller is not supplied by the low-voltage power branch 20 any more, so that the requirement of the voltage battery in the voltage transient drop can be reduced, the energy storage circuit is omitted, and the system cost is reduced.
When the high voltage UH output by the high voltage power supply branch 10 to the second voltage UL1 converter T2 in the third operating state falls abnormally, it may mean that after the electric vehicle is started, the high voltage UH output by the high voltage battery is abnormal, for example, the high voltage battery is disconnected or the high voltage UH output by the high voltage battery is not within the required range. When the high-voltage UH drops abnormally, at this time, the second voltage UL1 provided by the high-voltage power supply branch 20 to the second voltage UL1 converter T2 is greater than the first voltage UH1 provided by the high-voltage power supply branch 10 to the second voltage UL1 converter T2, the first unidirectional conduction device D1 is turned off reversely, the second unidirectional conduction device D2 is turned on, the low-voltage power supply loop of the high-voltage component is automatically switched to be powered by the low-voltage power supply branch 20 again, and the operation data of the high-voltage controller can be normally stored, so that the safety and normal operation of the whole vehicle are ensured.
In still another aspect of the embodiments of the present application, a power supply method of a high voltage controller of an electric vehicle is provided, where the power supply circuit includes a high voltage power supply branch 10, an auxiliary power supply branch connected in parallel with the high voltage power supply branch 10, and a voltage conversion circuit 30 connected to the high voltage power supply branch 10, where the auxiliary power supply branch is the high voltage power supply branch 20, please refer to fig. 3, and the method includes:
step S301, when the first voltage UH1 output by the high voltage power supply branch 10 to the voltage conversion circuit 30 is greater than the second voltage UL1 output by the low voltage power supply branch 20 to the voltage conversion circuit 30, the high voltage power supply branch 10 provides the second voltage UL1 to the voltage conversion circuit 30, the high voltage power supply branch 10 is turned on, the low voltage power supply branch 20 is turned off reversely, and the second voltage UL1 is converted into a power supply voltage UB via the voltage conversion circuit 30 to supply power to a high voltage component;
in step S303, when the first voltage UH1 is less than the second voltage UL1, the high voltage power supply branch 10 is turned off reversely, the low voltage power supply branch 20 is turned on, and the first voltage UH1 is converted into a supply voltage UB via the voltage conversion circuit 30 to supply power to the high voltage component.
In some embodiments, the power supply method further comprises: when the electric vehicle is started, the low-voltage power supply branch 20 provides a second voltage UL1 to the voltage conversion circuit 30, the second voltage UL1 is converted into a supply voltage UB by the voltage conversion circuit 30 to supply power to the high-voltage component, so that the high-voltage controller triggers the high-voltage power supply branch 10 to establish the first voltage UH1 output to the voltage conversion circuit 30 after self-checking is completed.
In this embodiment, the high-voltage power supply branch 10UH generates the first voltage UH1 through the first voltage UH1 converter T1 and the first unidirectional current-conducting device D1, the low-voltage power supply branch 20UL generates the second voltage UL1 through the second unidirectional current-conducting device D2, the high voltage after comparing the two voltages is sent to the second voltage UL1 converter T2, and the power supply voltage UB is generated after voltage conversion to supply power to the high-voltage component. The power supply loop has three working states as follows: first operating state: the electric automobile is firstly powered on with low voltage electricity, and the high voltage electricity is powered on after the self-checking of the high voltage controller is completed. Before the high voltage UH is established, the low voltage UL is converted into a supply voltage UB by the second unidirectional conducting device D2 and the second voltage UL1 converter T2, powering the high voltage controller. The second working state: after the high-voltage UH is established, the first voltage UH1 is compared with the second voltage UL1 through the first voltage UH1 converter T1 and the first unidirectional conduction device D1, the initial parameter is set to be larger than the second voltage UL1, the first voltage UH1 is sent to the second voltage UL1 converter T2, the second unidirectional conduction device D2 is reversely cut off, and the power supply voltage UB is provided by the high-voltage UH. Third working state: when the whole electric automobile is powered off or the high-voltage battery is abnormally disconnected, the high-voltage UH can be firstly reduced, when the second voltage UL1 is smaller than the first voltage UH1, the first unidirectional conduction device D1 can be reversely cut off, the second unidirectional conduction device D2 can be conducted, and the low-voltage UL is converted into a supply voltage UB after passing through the second unidirectional conduction device D2 and the second voltage UL1 converter T2, so that the high-voltage controller of the high-voltage component is supplied with power.
In still another aspect of the embodiment of the application, an electric automobile is further provided, and the electric automobile comprises the power supply circuit of the electric automobile high-voltage controller provided by the embodiment of the application. The related technical principles and technical effects are described in detail in the above embodiments, and are not described herein.
In the embodiment of the application, the low-voltage power supply loop of the high-voltage controller of the electric automobile is powered by the low-voltage power supply branch and the high-voltage power supply branch simultaneously, the high-voltage power supply branch 10 and the low-voltage power supply branch 20 can be smoothly switched according to the power supply state of the high-voltage side, the low-voltage power supply branch 20 can be powered by the high-voltage power supply before the high-voltage is built, the high-voltage component can store data, the whole vehicle requirement is met, the conventional power supply of the low-voltage power supply loop of the high-voltage controller of the electric automobile is provided by the high-voltage side, the low-voltage power supply branch 20 is not powered, the requirement of a voltage battery when the voltage is instantaneously reduced can be reduced, and the energy storage circuit is omitted, so that the cost is reduced. The power supply circuit of the high-voltage controller of the electric automobile is simple in design and easy to realize, and the system cost of the electric automobile is effectively reduced.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. The scope of the invention is to be determined by the appended claims.
Claims (10)
1. The power supply circuit of the high-voltage controller of the electric automobile is characterized by comprising a high-voltage power supply branch, an auxiliary power supply branch connected with the high-voltage power supply branch in parallel and a voltage conversion circuit connected with the high-voltage power supply branch, wherein the high-voltage power supply branch comprises a first voltage converter connected with the output end of a high-voltage battery and a first unidirectional conduction device connected between the output end of the first voltage converter and the input end of the voltage conversion circuit; the auxiliary power supply branch is a low-voltage power supply branch and comprises a second unidirectional conduction device connected between the output end of the low-voltage battery and the input end of the voltage conversion circuit; the voltage conversion circuit comprises a second voltage converter;
before the high-voltage power supply branch circuit outputs high-voltage to the second voltage converter, the high-voltage power supply branch circuit provides first voltage to the second voltage converter through the second unidirectional conduction device, and the first voltage is converted into power supply voltage through the second voltage converter to supply power to the high-voltage component;
after the high-voltage output by the high-voltage power supply branch to the second voltage converter is established, providing a second voltage to the second voltage converter through the first unidirectional conduction device, wherein the second voltage is larger than the first voltage, the second unidirectional conduction device is reversely cut off, and the second voltage is converted into a power supply voltage through the second voltage converter to supply power to the high-voltage component;
the first voltage converter is a first transformer T1, the second voltage converter is a second transformer T2, and the high-voltage component is a high-voltage controller driven by high voltage.
2. The power supply circuit of claim 1, wherein a turn-on voltage of the first unidirectional-on device is greater than a turn-on voltage of the second unidirectional-on device.
3. The power supply circuit of claim 1, wherein an output of the first unidirectional conducting device is connected to an output of the second unidirectional conducting device to form a node, the node being connected to an input of the second voltage converter.
4. The power supply circuit according to claim 1, wherein when the high-voltage power supply branch is disconnected or output is abnormal, a first voltage supplied to the second voltage converter by the high-voltage power supply branch through the second unidirectional-conduction device is larger than an output voltage of the high-voltage power supply branch to the second voltage converter, the first unidirectional-conduction device is turned off, and the first voltage is converted into a power supply voltage through the second voltage converter.
5. The power supply circuit of the high-voltage controller of the electric automobile is characterized by comprising a high-voltage power supply branch, an auxiliary power supply branch connected with the high-voltage power supply branch in parallel and a voltage conversion circuit connected with the high-voltage power supply branch, wherein the high-voltage power supply branch comprises a first voltage converter connected with the output end of a high-voltage battery and a first unidirectional conduction device connected between the output end of the first voltage converter and the input end of the voltage conversion circuit; the auxiliary power supply branch is a low-voltage power supply branch and comprises a second unidirectional conduction device connected between the output end of the low-voltage battery and the input end of the voltage conversion circuit; the voltage conversion circuit comprises a second voltage converter; the power supply circuit is switched between different working states according to the output of the high-voltage power supply branch circuit, and the working states comprise at least two of the following:
the first working state is that before the high-voltage power supply branch circuit outputs high-voltage to the second voltage converter, the first voltage is supplied to the second voltage converter through the second unidirectional conduction device by the low-voltage power supply branch circuit, and the first voltage is converted into power supply voltage through the second voltage converter to supply power to the high-voltage component;
the second working state is that after the high-voltage output by the high-voltage power supply branch to the second voltage converter is established, the high-voltage power supply branch provides a second voltage to the second voltage converter through the first unidirectional conduction device, the second voltage is larger than the first voltage, the second unidirectional conduction device is reversely cut off, and the second voltage is converted into a power supply voltage through the second voltage converter to supply power to the high-voltage component;
when the high-voltage power supply branch circuit abnormally drops to the high-voltage output by the second voltage converter, the first voltage provided by the high-voltage power supply branch circuit to the second voltage converter through the second unidirectional conduction device is larger than the output voltage of the high-voltage power supply branch circuit to the second voltage converter, the first unidirectional conduction device is reversely cut off, and the first voltage is converted into a power supply voltage through the second voltage converter to supply power to a high-voltage component;
the first voltage converter is a first transformer T1, the second voltage converter is a second transformer T2, and the high-voltage component is a high-voltage controller driven by high voltage.
6. The power supply circuit of claim 5, wherein the turn-on voltage of the first unidirectional-on device is greater than the second unidirectional-on device.
7. The power supply circuit of claim 5, wherein an output of the first unidirectional conducting device is connected to an output of the second unidirectional conducting device to form a node, the node being connected to an input of the second voltage converter.
8. The power supply method of the high-voltage controller of the electric automobile is characterized in that a power supply circuit comprises a high-voltage power supply branch, an auxiliary power supply branch connected with the high-voltage power supply branch in parallel and a voltage conversion circuit connected with the high-voltage power supply branch, wherein the auxiliary power supply branch is the high-voltage power supply branch, and the power supply method comprises the following steps:
when the first voltage output by the high-voltage power supply branch circuit to the voltage conversion circuit is larger than the second voltage output by the low-voltage power supply branch circuit to the voltage conversion circuit, the high-voltage power supply branch circuit is provided with the second voltage, the high-voltage power supply branch circuit is conducted, the low-voltage power supply branch circuit is reversely cut off, and the second voltage is converted into a power supply voltage by the voltage conversion circuit to supply power to the high-voltage component;
when the first voltage is smaller than the second voltage, the high-voltage power supply branch is reversely cut off, the high-voltage power supply branch is conducted, and the first voltage is converted into a power supply voltage through the voltage conversion circuit to supply power to the high-voltage component;
the first voltage converter is a first transformer T1, the second voltage converter is a second transformer T2, and the high-voltage component is a high-voltage controller driven by high voltage.
9. The power supply method according to claim 8, wherein when the electric vehicle is started, the low-voltage power supply branch supplies a second voltage to the voltage conversion circuit, the second voltage is converted into a power supply voltage by the voltage conversion circuit to supply power to a high-voltage component, so that the high-voltage controller triggers the high-voltage power supply branch to establish the first voltage output to the voltage conversion circuit after self-checking is completed.
10. An electric vehicle, characterized by comprising a power supply circuit of the electric vehicle high voltage controller according to any one of claims 1 to 7.
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| CN202010187757.1A CN111204221B (en) | 2020-03-17 | 2020-03-17 | Power supply circuit and method of high-voltage controller of electric automobile and electric automobile |
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| CN202010187757.1A CN111204221B (en) | 2020-03-17 | 2020-03-17 | Power supply circuit and method of high-voltage controller of electric automobile and electric automobile |
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| CN204055403U (en) * | 2014-09-02 | 2014-12-31 | 中国东方电气集团有限公司 | A kind of redundant circuit structure of accessory feed of electric-vehicle-mounted DC/DC device |
| CN207490551U (en) * | 2017-11-02 | 2018-06-12 | 深圳市科列技术股份有限公司 | A kind of electric vehicle loop of power circuit and battery management system and its power supply circuit |
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| CN212148432U (en) * | 2020-03-17 | 2020-12-15 | 深圳市微燃科技有限公司 | Power supply circuit of electric automobile high-voltage controller and electric automobile |
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2020
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN204055403U (en) * | 2014-09-02 | 2014-12-31 | 中国东方电气集团有限公司 | A kind of redundant circuit structure of accessory feed of electric-vehicle-mounted DC/DC device |
| CN207490551U (en) * | 2017-11-02 | 2018-06-12 | 深圳市科列技术股份有限公司 | A kind of electric vehicle loop of power circuit and battery management system and its power supply circuit |
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