High-power vehicle-mounted direct-current power supply control device

Abstract

The utility model relates to the field of power supply control devices, and particularly discloses a high-power vehicle-mounted direct-current power supply control device. According to the utility model, the soft start module and the soft turn-off module are arranged to carry out soft turn-off on the vehicle-mounted DC power supply, so that the impact current of the vehicle-mounted power supply in the turn-on and turn-off processes is greatly reduced, and the voltage closed-loop control module and the current closed-loop control module are arranged to form output voltage outer-loop peak current inner-loop double-closed-loop control. According to the control system, direct-current power supply constant-voltage output and power inductance peak current output control are achieved, the reliability and stability of the control system are improved, the multiple synchronous rectification control modules are arranged, on-off control of the multiple synchronous rectification modules is achieved, the loss of switch tubes is reduced, the stress of switches is reduced, and the service life of the switch tubes is prolonged. The efficiency of the vehicle-mounted power supply is improved, and the size of the radiator and the weight of the whole machine are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of power supply control devices, and in particular relates to a high-power vehicle-mounted direct current power supply control device. Background Art

[0002] As an important power source for electric vehicles, the battery has a large output voltage fluctuation range, while the operating voltage of the on-board electrical appliances is a stable low-voltage DC, and the output DC voltage fluctuation range is within 0.2V. At the same time, the conversion assembly must have the necessary design functions and performance, and must also meet special requirements for constant voltage / constant current, input overvoltage / undervoltage, input reverse connection, inrush current during startup, volume, efficiency, weight, reliability, electromagnetic interference and anti-interference, thermal performance, noise, overload / short circuit, etc.

[0003] In view of the vehicle's requirements for the functions, performance and experiments of the on-board power supply device, the on-board DC power supply control device is required to have strong functions: including soft start, soft shutdown, voltage closed-loop control, current closed-loop control, PWM output, switch tube drive and other functions.

[0004] In response to the performance requirements of switching power supplies such as high efficiency and low ripple, domestic and foreign companies and research institutes have conducted research on multiple multi-phase synchronous rectification converters, X-zone zero voltage switching control strategies, full digital control technology, loss analysis and evaluation methods, etc. These research topics have greatly improved the local performance of vehicle power supplies, but there is currently no full-featured vehicle power digital control device for special vehicle operating conditions. Utility Model Content

[0005] The purpose of the utility model is to provide a high-power vehicle-mounted DC power supply control device to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A high-power vehicle-mounted DC power supply control device, comprising:

[0008] A soft start-stop module, which is used to control the slow start and stop of the vehicle power supply;

[0009] A voltage closed-loop control module, wherein the voltage closed-loop control module is used for constant voltage control of the output voltage;

[0010] A current closed-loop control module, wherein the current closed-loop control module is used for peak current control of the power inductor current;

[0011] A multiple synchronous rectification control module, the multiple synchronous rectification control module is used to realize the opening and closing time control of the synchronous rectification modules of multiple converters;

[0012] A PWM generating module, wherein the PWM generating module is used to output a PWM waveform with a certain duty cycle;

[0013] A driving module, wherein the driving module is used to control the switching device to be turned on and off.

[0014] Preferably, the soft start-stop module includes:

[0015] A soft start module, which is used to control the vehicle power supply to start slowly;

[0016] A soft shutdown module is used to control the vehicle power supply to slowly shut down.

[0017] Preferably, the soft start module, soft shutdown module, voltage closed-loop control module, current closed-loop control module, multiple synchronous rectification control module, PWM generation module and driving module are connected in sequence.

[0018] Preferably, the feedback value of the voltage closed-loop control module is the output average voltage, and the reference value is a given voltage.

[0019] Preferably, the feedback value of the current closed-loop control module is the peak current of the power inductor, and the reference value is the voltage closed-loop output.

[0020] Preferably, the PWM waveform output of the PWM generation module is based on the output values ​​of the voltage closed-loop control module, the current closed-loop control module and the multiple synchronous rectification control module.

[0021] Preferably, the control condition for the driving module to turn on and off the switching device is a PWM waveform.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] The utility model softly shuts down the vehicle-mounted DC power supply by setting a soft start module and a soft shutdown module, thereby greatly reducing the impact current of the vehicle-mounted power supply during the opening and closing process. By setting a voltage closed-loop control module and a current closed-loop control module, a dual closed-loop control of an output voltage outer loop and a peak current inner loop is formed to achieve constant voltage output of the DC power supply and peak current output control of the power inductor, thereby improving the reliability and stability of the control system. By setting multiple synchronous rectification control modules, the control of opening and closing of multiple synchronous rectification modules is achieved, which not only reduces the loss of the switching tube, but also reduces the stress of the switch, improves the efficiency of the vehicle-mounted power supply, and reduces the size of the radiator and the weight of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural block diagram of the control device of the utility model;

[0025] Figure 2This is a flow chart of the output voltage outer loop peak current inner loop double closed-loop control program of the utility model. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Example:

[0028] See also Figure 1 - Figure 2 As shown, a high-power vehicle-mounted DC power supply control device includes:

[0029] A soft start module, which is used to control the vehicle power supply to start slowly and reduce the inrush current during starting;

[0030] A soft shutdown module, which is used to control the vehicle power supply to slowly shut down and reduce the impact current during shutdown;

[0031] The voltage closed-loop control module has the main function of taking the output average voltage as the feedback value and the given voltage as the reference value to achieve constant voltage control of the output voltage;

[0032] The current closed-loop control module has the main function of using the power inductor current as the feedback value and the voltage closed-loop output as the reference value to achieve peak current control of the power inductor current;

[0033] Multiple synchronous rectification control module, whose main function is to realize the opening and closing time control of multiple converter synchronous rectification modules;

[0034] The PWM generation module has the main function of outputting a PWM waveform with a certain duty cycle according to the output values ​​of the current closed-loop control module and the multiple synchronous rectification control module;

[0035] The driving module, whose main function is to control the opening and closing of the switching device according to the PWM waveform.

[0036] In order to solve the problem of excessive inrush current when the vehicle-mounted DC power supply is started and shut down, soft start and soft shutdown technology is adopted. During the start-up process, the duty cycle of the driving pulse of the switch tube is slowly increased, and the start-up time can be flexibly controlled; during the shutdown process, the duty cycle of the driving pulse of the switch tube is slowly reduced, and the shutdown time of the switch tube can also be flexibly controlled. This greatly reduces the inrush current of the vehicle-mounted power supply during the start-up and shutdown process.

[0037] The average value of the output voltage is used as the feedback value of the voltage outer loop, and PI closed-loop control is adopted. The output of the voltage loop is used as the reference value of the current inner loop. The freewheeling diode of the inductive element is changed to MOSFET, and the power inductor current and the peak current of the MOSFET are used as the inner loop current feedback values. The voltage outer loop and peak current inner loop dual closed-loop control strategy is adopted. On the basis of realizing output voltage closed-loop control, the maximum current output control of the MOSFET can be realized, thereby improving the reliability and capacity of the control system.

[0038] According to the working state of the circuit, the control device can control the opening and closing of the MOSFET, which not only reduces the loss of the switching tube, but also reduces the stress of the switch, improves the efficiency of the vehicle power supply, and reduces the size of the radiator and the weight of the whole machine.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0041] In the drawings of the embodiments disclosed by the present invention, only the structures related to the embodiments disclosed by the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

Claims

1. A high-power vehicle-mounted DC power supply control device, characterized in that: include: A soft start-stop module, which is used to control the slow start and stop of the vehicle power supply; A voltage closed-loop control module, wherein the voltage closed-loop control module is used for constant voltage control of the output voltage; A current closed-loop control module, wherein the current closed-loop control module is used for peak current control of the power inductor current; A multiple synchronous rectification control module, the multiple synchronous rectification control module is used to realize the opening and closing time control of the synchronous rectification modules of multiple converters; A PWM generating module, wherein the PWM generating module is used to output a PWM waveform with a certain duty cycle; A driving module, wherein the driving module is used to control the switching device to be turned on and off.

2. A high-power vehicle-mounted DC power supply control device according to claim 1, characterized in that: The soft start-stop module comprises: A soft start module, which is used to control the vehicle power supply to start slowly; A soft shutdown module is used to control the vehicle power supply to slowly shut down.

3. A high-power vehicle-mounted DC power supply control device according to claim 2, characterized in that: The soft start module, soft shut-off module, voltage closed-loop control module, current closed-loop control module, multiple synchronous rectification control module, PWM generation module and driving module are connected in sequence.

4. A high-power vehicle-mounted DC power supply control device according to claim 1, characterized in that: The feedback value of the voltage closed-loop control module is the output average voltage, and the reference value is a given voltage.

5. A high-power vehicle-mounted DC power supply control device according to claim 1, characterized in that: The feedback value of the current closed-loop control module is the peak current of the power inductor, and the reference value is the voltage closed-loop output.

6. A high-power vehicle-mounted DC power supply control device according to claim 1, characterized in that: The PWM waveform output of the PWM generation module is based on the output values ​​of the voltage closed-loop control module, the current closed-loop control module and the multiple synchronous rectification control module.

7. A high-power vehicle-mounted DC power supply control device according to claim 1, characterized in that: The control condition for the driving module to turn on and off the switch device is a PWM waveform.

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