TW201926849A - Multi-power supply system and multi-power supply method for electric vehicle including first to third power supplies, first to third DC/DC converters and a control device - Google Patents

Abstract

A multi-power supply system of an electric vehicle includes first to third power sources, first to third DC/DC converters and a control device. A multi-power supply method includes: the control device controlling the first to third DC/DC converters according to power required by a power motor module in order to select one of the first DC/DC converter and the third DC/DC converter to output electric energy, or to select one of the first DC/DC converter and the third DC/DC converter to output electric energy together with the second DC/DC converter. Thereby, a variety of power supply methods are provided.

Description

Electric vehicle power supply system and multi-power supply method

The invention relates to an electric vehicle; in particular to a multi-power supply system and a multi-power supply method.

The development of the vehicle industry in various countries has gradually turned to a relatively non-polluting power source with high efficiency, energy saving and cleanness. Therefore, the power source of the vehicle has been developed from the early use of fuel (such as gasoline, diesel, gas) to the hybrid power of oil and electricity. In order to reduce emissions, we will achieve sustainable development and energy saving.

With the reduction of manufacturing costs, consumers' acceptance of oil-electric hybrid vehicles on the market is gradually increasing. However, hybrid electric vehicles still have problems such as exhaust emission, efficiency conversion and endurance. Therefore, the industry continues to develop pure electric electric vehicles to effectively solve the emissions of traditional internal combustion engine exhaust. However, the bottleneck encountered by pure electric vehicles at present is the energy density, cycle life, price, power station, charging time, battery management and other issues of the battery. Therefore, pure electric vehicles are still conceptual cars and cannot be popularized in the market.

In view of this, the object of the present invention is to provide a multi-power supply system and a multi-power supply method for an electric vehicle, which can provide various power supply modes in response to different load states of the electric vehicle.

In order to achieve the above object, the present invention provides a multi-power supply system for an electric vehicle for supplying power to a power motor module of an electric vehicle to drive the electric vehicle to move; the multi-power supply system includes a first power source, a first a DC/DC converter, a second power source, a second DC/DC converter, a third power source, a third DC/DC converter, and a control device, wherein the first DC/DC converter Electrically connecting the first power source and the power motor module, the first DC/DC converter being controlled to convert the electrical energy of the first power source into a power output having a first predetermined voltage, or controlled Stopping the output of the electric energy; the second DC/DC converter is electrically connected to the second power source and the power motor module, and the second DC/DC converter is controlled to convert the electric energy of the second power source to have the first a predetermined voltage of electrical energy output, or controlled to stop outputting electrical energy; the third DC/DC converter is electrically connected to the third power source and the power motor module, the third DC/DC converter is controlled Converting the electrical energy of the third power source into an electrical energy output having the first predetermined voltage, or being controlled to stop outputting electrical energy; the control device electrically connecting the first DC/DC converter, the second DC/DC conversion And the third DC/DC converter, the control device controls the first DC/DC converter, the second DC/DC converter and the third DC/DC converter according to power required by the power motor module And outputting electrical energy to one of the first DC/DC converter and the third DC/DC converter, or the first DC/DC converter and the third DC/DC converter At least one of the second DC/DC converters collectively outputs electrical energy.

The multi-power supply method for an electric vehicle provided by the present invention comprises: A, providing a first power source, a second power source and a third power source; B, selecting the first according to the power required by the power motor module Converting electrical energy of one of the power source and the third power source to electrical energy having a first predetermined voltage output to the power motor module, or selecting to convert electrical energy of at least one of the first power source and the third power source to The electric energy having the first predetermined voltage is converted into electric energy having the first predetermined voltage and outputted to the power motor module.

The effect of the invention is that the power supply of the power supply is controlled by the control device, and the power supply is integrated into the power motor module, so that the multi-power supply system can switch between different power supply modes in accordance with the load required by the power motor module, In response to the different load states of the electric vehicle, the battery life of the electric vehicle is further improved.

In order to explain the present invention more clearly, a preferred embodiment will be described in detail with reference to the drawings. 1 is a multi-power supply system 100 for an electric vehicle according to a first preferred embodiment of the present invention. The multi-power supply system 100 is configured to perform a multi-power supply method of the present embodiment to supply power to an electric vehicle. The power motor module P includes a driver P1 and a motor P2. The driver P1 is configured to receive a control signal and control the operation of the motor P2 according to the control signal to move the electric vehicle. The power supply system 100 and the multi-power supply method will be described together.

The multi-power supply system 100 includes a first power source 10, a first DC/DC converter 12, a second power source 14, a second DC/DC converter 16, and a third power source. 18. A third DC/DC converter 20, a diode 22 and a control device 24, wherein:

The first power source 10 provided in this embodiment is a lithium battery, such as a lithium iron phosphate battery. In practice, the first power source 10 can also be other forms of batteries. The first DC/DC converter 12 is electrically connected to the first power source 10, and the first DC/DC converter 12 is controlled to convert the power of the first power source 10 to have a first predetermined voltage. The power is output, or controlled to stop outputting power.

The second power source 14 is different in type from the first power source 10, and in the embodiment, the second power source 14 is a super capacitor, and the second power source 14 has a discharge current greater than the first power source 10 and the first The maximum discharge current of each of the three power supplies 18. The second DC/DC converter 16 is electrically connected to the second power source 14. The second DC/DC converter 16 is controlled to convert the power of the second power source 14 into the same electrical energy as the first predetermined voltage. Output, or controlled to stop outputting power.

The third power source 18 is different in type from the first power source 10 and the second power source 14. In the embodiment, the third power source 18 is a fuel cell. The fuel cell has the advantages of high energy density and high energy. Conversion efficiency can solve the problems of energy density and insufficient capacity of conventional electric vehicles. The third DC/DC converter 20 is electrically connected to the third power source 18, and the third DC/DC converter 20 is controlled to convert the power of the third power source 18 into an electric energy output having the first predetermined voltage. , or controlled to stop outputting power.

The first DC/DC converter 12, the second DC/DC converter 16 and the third DC/DC converter 20 are electrically connected to the power motor module P. In this embodiment, the first DC/ The DC converter 12, the second DC/DC converter 16 and the third DC/DC converter 20 are electrically connected to the power motor module P through the diode 22, wherein the anode of the diode 22 is electrically The cathode of the first DC/DC converter 12, the second DC/DC converter 16, the third DC/DC converter 20, and the cathode of the diode are electrically connected. The driver P1 of the motor module P is to supply the power required by the power motor module P. In addition, the first DC/DC converter 12, the second DC/DC converter 16 and the third DC/DC converter 20 each have a current limiting circuit, and each current limiting circuit is controlled. Actuation to limit the discharge current of the input first power source 10, second power source 14, or third power source 18.

The control device 24 is electrically connected to the first power source 10, the second power source 14, the third power source 18, the first DC/DC converter 12, the second DC/DC converter 16, and the third DC. /DC converter 20 and driver P1 of power motor module P. The control device 24 is configured to detect the remaining power of the first power source 10, the second power source 14 and the third power source 18, and detect the power consumed by the motor P2 (such as detecting current), and transmit the control signal to the driver P1. To control the operation of the motor P2. The control device 24 can be additionally connected with an operation interface (not shown), and the user can select to start or stop the electric vehicle movement through the operation interface.

Then, when the user selects to start the electric vehicle to move, the control device 24 controls the first DC/DC converter 12, the second DC/DC converter 16 and the third according to the power required by the power motor module P. The DC/DC converter 20 selectively selects one of the first DC/DC converter 12 and the third DC/DC converter 20 to output electrical energy, that is, the first power source 10 and the third power source 18 Converting the electrical energy of one of the electrical energy to a power motor module P having a first predetermined voltage; or causing at least one of the first DC/DC converter 12 and the third DC/DC converter 20 And the second DC/DC converter 16 outputs electrical energy in common, that is, converting electrical energy of at least one of the first power source 10 and the third power source 18 into electrical energy having a first predetermined voltage and the second power source 14 The electric energy is converted into electric energy having a first predetermined voltage and output to the power motor module P in common.

In this embodiment, the control device 24 performs switching between a plurality of different control modes to control the first DC/DC converter 12, the second DC/DC converter 16, and the third DC/DC. The converter 20, wherein the control modes include a first mode, a second mode, and a third mode, which are described as follows:

First mode:

That is, the normal driving mode (low load state or driving on a flat road), the control device 24 detects that the power required by the motor P2 is a lower power demand level, and when detecting that the power of the first power source 10 is sufficient, the control device 24 The second DC/DC converter 16 and the third DC/DC converter 20 are controlled to stop outputting electric energy and the electric energy outputted by the first DC/DC converter 12 is transmitted to the power motor module via the diode. In other words, in the first mode, only the power of the first power source 10 can be used to support the power required by the power motor module P.

Second mode:

That is, the higher load state or the electric vehicle climbing state, the control device 24 detects that the power required by the motor P2 is higher than the power demand level of the first mode, and detects that the first power source 10 and the second power source 14 have sufficient power. The control device 24 controls the third DC/DC converter 20 to stop outputting electric energy and control the electric energy output by the first DC/DC converter 12 and the electric energy output by the second DC/DC converter 16 to pass through the The diode 22 is transmitted to the driver P1 of the power motor module P. At this time, the power motor module P has a current supplied simultaneously by the first power source 10 and the second power source 14, and thus can withstand operation in a higher load state. It is worth mentioning that, since the second power source 14 of the embodiment uses a super capacitor, the super capacitor has a large current discharge capability, so that a large current required for the power motor module P can be provided immediately.

In addition, in the second mode, the control device 24 controls the first DC/DC converter 12 to operate its current limiting circuit to limit the discharge current of the input first power source 10, so that the discharge current of the first power source 10 is low. At a predetermined current, the lithium battery is prevented from being depleted due to large current discharge.

The third mode:

That is, the highest load state or the electric vehicle climbs the steeper slope state, and the control device 24 detects that the power required by the motor P2 is higher than the power demand level of the second mode, and detects the amount of power of the first power source 10 and the second power source 14. When sufficient, the control device 24 controls the power outputted by the first DC/DC converter 12, the second DC/DC converter 16, and the third DC/DC converter 20 to be transmitted via the diode 22 to Power motor module P. Thereby, the maximum current is supplied to the power motor module P.

In addition, among the control modes performed by the control device 24, a fourth mode and a fifth mode may be further included, where:

The fourth mode:

Similar to the first mode, the control device 24 controls the first DC/DC converter 12 and the second when the control device 24 detects that the amount of the first power source 10 is lower than a predetermined amount of power. The DC/DC converter 16 stops outputting power, and the power that controls the output of the third DC/DC converter 20 is transmitted to the power motor module P via the diode 22. In other words, the third power source 18 is used as the power when the first power source 10 is low in power.

The fifth mode:

The second mode is similar to the second mode. The control device 24 controls the first DC/DC converter 12 to stop outputting power when the control device 24 detects that the power of the first power source 10 is lower than the predetermined power. The electric energy outputted by the second DC/DC converter 16 and the electric energy output by the third DC/DC converter 20 are transmitted to the power motor module via the diode 22. In other words, the second power source 14 is a super capacitor and has a large current discharge capability, and the large current required for the power motor module P is immediately provided.

It can be seen from the above that the multi-power supply system 100 can perform different power supply modes by different power sources and the integrated power supply of the diodes 22, so as to meet the different power requirements of the power motor module, not only can increase the endurance of the electric vehicle, And extend the life of the lithium battery.

2 is a multi-power supply system 200 for an electric vehicle according to a second preferred embodiment of the present invention. Based on the first embodiment, the present invention further includes a fourth DC/DC converter 28 and a fifth DC/DC. The converter 30, wherein the fourth DC/DC converter 28 is electrically connected to the output 埠 of the third power source 18 and the anode and cathode of the first power source 10, and the fourth DC/DC converter 28 is controlled. The electric energy of the third power source 18 is converted into an electric energy output having a second predetermined voltage, or is controlled to stop outputting electric energy; the fifth DC/DC converter 30 is electrically connected to the output of the third power source 18 and The positive and negative poles of the second power source 14 are controlled to convert the electrical energy of the third power source 18 into an electrical energy output having a third predetermined voltage, or controlled to stop outputting electrical energy.

In the multiple power supply method of the embodiment, the control device 24 controls the first DC/DC converter 12 to stop outputting power and control the fourth DC/DC converter 28 in the fourth mode. The electric energy is output to the positive and negative poles of the first power source 10 to charge the first power source 10. In addition, the control device 24 further controls the second DC/DC converter 16 to stop outputting power and control the fifth DC/DC converter 30 to output power to the positive and negative poles of the second power source 14 to the second power source 14 . Charging. Thereby, in the fourth mode, the third power source 18 can not only separately supply the power required by the power motor module P, but also provide power for charging the first power source 10 and the second power source 14.

According to the above, the multi-power supply system and method of the electric vehicle of the present invention controls the power supply of the power supply by setting a plurality of different types of power supply and control devices 24, so that the multi-power supply system can match the load required by the power motor module P. Switching between a variety of different power modes, that is, powering according to the characteristics of different types of power supplies, maximizes the efficiency of use of each power source, and further enhances the endurance of the electric vehicle.

The above is only a preferred embodiment of the present invention, and equivalent changes to the scope of the present invention and the scope of the patent application are intended to be included in the scope of the present invention.

[this invention]

100‧‧‧Multiple power supply system

10‧‧‧First power supply

12‧‧‧First DC/DC Converter

14‧‧‧second power supply

16‧‧‧Second DC/DC converter

18‧‧‧ Third power supply

20‧‧‧ Third DC/DC Converter

22‧‧‧ diode

24‧‧‧Control device

200‧‧‧Multiple power supply system

28‧‧‧4th DC/DC converter

30‧‧‧ Fifth DC/DC Converter

P‧‧‧Power Motor Module

P1‧‧‧ drive

P2‧‧‧ motor

1 is a block diagram of a multi-power supply system for an electric vehicle according to a first preferred embodiment of the present invention. 2 is a structural diagram of a multi-power supply system for an electric vehicle according to a second preferred embodiment of the present invention.

Claims (17)

A multi-power supply system for an electric vehicle for supplying power to a power motor module of an electric vehicle to drive the electric vehicle to move; the multi-power supply system comprises: a first power source; a first DC/DC converter, electric The first power source and the power motor module are connected, and the first DC/DC converter is controlled to convert the power of the first power source into a power output having a first predetermined voltage, or is controlled to stop. a second power source; a second DC/DC converter electrically connected to the second power source and the power motor module, the second DC/DC converter being controlled to control the power of the second power source Converting to an electric energy output having the first predetermined voltage, or controlling to stop outputting electric energy; a third power supply; a third DC/DC converter electrically connecting the third power source and the power motor module, the first The three DC/DC converter is controlled to convert the electrical energy of the third power source into an electrical energy output having the first predetermined voltage, or is controlled to stop outputting electrical energy; and a control device electrically connected The first DC/DC converter, the second DC/DC converter and the third DC/DC converter, the control device controls the first DC/DC converter according to power required by the power motor module The second DC/DC converter and the third DC/DC converter to output electrical energy to one of the first DC/DC converter and the third DC/DC converter, or the first The DC/DC converter and at least one of the third DC/DC converter and the second DC/DC converter output electrical energy. The multi-power supply system for an electric vehicle according to claim 1, comprising a diode; the first DC/DC converter, the second DC/DC converter, and the third DC/DC converter pass through the The diode is electrically connected to the power motor module, wherein the anode of the diode is electrically connected to the first DC/DC converter, the second DC/DC converter, and the third DC/DC converter The cathode of the diode is electrically connected to the power motor module. The multiple power supply system of the electric vehicle according to claim 1, wherein the control device switches between the plurality of different control modes according to the power required by the power motor module to control the first DC/DC converter. The second DC/DC converter and the third DC/DC converter, wherein the control modes include a first mode, a second mode, and a third mode, wherein: in the first mode, the control The device controls the second DC/DC converter and the third DC/DC converter to stop outputting power and control the power output of the first DC/DC converter to be transmitted to the power motor module; in the second mode, the The control device controls the third DC/DC converter to stop outputting electrical energy and control the electrical energy outputted by the first DC/DC converter to be transmitted to the power motor module together with the electrical energy output by the second DC/DC converter; In a third mode, the control device controls the first DC/DC converter, the second DC/DC converter, and the third DC/DC converter output power to be jointly transmitted to the power motor Module. The multiple power supply system of the electric vehicle of claim 3, wherein the control modes comprise a fourth mode, wherein in the fourth mode, the control device controls the first DC/DC converter and the second The DC/DC converter stops outputting power, and the power that controls the output of the third DC/DC converter is transmitted to the power motor module via the diode. The multi-power supply system of the electric vehicle according to claim 4, comprising a fourth DC/DC converter electrically connected to the third power source and the anode and the cathode of the first power source, the fourth DC/DC converter system Controlling to convert the electrical energy of the third power source into an electrical energy output having a second predetermined voltage, or controlled to stop outputting electrical energy; in the fourth mode, the control device is included to control the first DC/DC conversion The device stops outputting power and controls the fourth DC/DC converter output power to the positive and negative poles of the first power source to charge the first power source. The multi-power supply system of the electric vehicle according to claim 5, comprising a fifth DC/DC converter electrically connected to the third power source and the anode and the cathode of the second power source, the fifth DC/DC converter system Controlled to convert the electrical energy of the third power source into an electrical energy output having a third predetermined voltage, or controlled to stop outputting electrical energy; in the fourth mode, the control device is included to control the second DC/DC converter The output power is stopped and the fifth DC/DC converter output power is controlled to the positive and negative poles of the second power source to charge the second power source. The multi-power supply system of the electric vehicle of claim 3, wherein the control modes further comprise a fifth mode, wherein in the fifth mode, the control device controls the first DC/DC converter to stop outputting electrical energy And the electrical energy outputted by the second DC/DC converter is transmitted to the power motor module via the diode. The multi-power supply system of the electric vehicle of claim 1, wherein the first power source is a lithium battery, the second power source is a super capacitor, and the third power source is a fuel cell, wherein a discharge current of the second power source is greater than the The respective maximum discharge current of the first power source and the third power source. The multiple power supply system of the electric vehicle according to claim 8, wherein the first DC/DC converter has a current limiting circuit; and in the second mode, the control device is included to control the first DC/DC converter The current limiting circuit limits a discharge current of the input first power source such that a discharge current of the first power source is lower than a predetermined current. A multi-power supply method for an electric vehicle for supplying power to a power motor module of an electric vehicle to drive the electric vehicle to move; the multi-power supply method includes: A. providing a first power source, a second power source, and a third The power supply is selected to convert the electrical energy of one of the first power source and the third power source into a power motor module having a first predetermined voltage, or select the power according to the power required by the power motor module, or select Converting electrical energy of at least one of the first power source and the third power source into electric energy having the first predetermined voltage and converting the electric energy of the second power source into electric energy having the first predetermined voltage, and outputting the power to the power together Motor module. The multi-power supply method of the electric vehicle according to claim 1, wherein in step B, switching between a plurality of different control modes is performed according to power required by the power motor module, wherein the control modes include a first mode, a second mode and a third mode, wherein: in the first mode, converting the electrical energy of the first power source to the power having the first predetermined voltage and transmitting the power to the power motor module; Converting the electric energy of the first power source into electric energy having the first predetermined voltage and converting the electric energy of the second power source into electric energy having the first predetermined voltage, and outputting the same to the power motor module; in the third mode, The electric energy of the first power source, the electric energy of the second power source, and the electric energy of the third power source are respectively converted into electric energy having the first predetermined voltage, and then output to the power motor module. The multi-power supply method of the electric vehicle according to claim 11, wherein the control modes in the step B comprise a fourth mode, wherein in the fourth mode, converting the electrical energy of the third power source to have the first The predetermined voltage of electrical energy is transmitted to the power motor module. The multi-power supply method of the electric vehicle according to claim 12, wherein in the fourth mode, the fourth mode includes converting the electric energy of the third power source to the electric energy having a second predetermined voltage, and transmitting the electric energy to the first power source to Charging the first power source. The multi-power supply method of the electric vehicle according to claim 13, wherein in the fourth mode, the fourth mode includes converting the electric energy of the third power source into electric energy having a third predetermined voltage, and transmitting the electric energy to the second power source to Charging the second power source. The multi-power supply method of the electric vehicle according to claim 11, wherein the control modes in step B comprise a fifth mode, wherein in the fifth mode, the electric energy of the second power source is converted to have the first The electric energy of the predetermined voltage is converted into electric energy having the first predetermined voltage and outputted to the power motor module. The multi-power supply method of the electric vehicle according to claim 10, wherein the first power source is a lithium battery, the second power source is a super capacitor, and the third power source is a fuel cell, wherein a discharge current of the second power source is greater than the The respective maximum discharge current of the first power source and the third power source. The multi-power supply method of the electric vehicle according to claim 16, wherein in the step B, the second mode includes limiting a discharge current of the first power source to be lower than a predetermined current.