CN104953822B - Vehicle Controller voltage stabilizing power supplying circuit and Vehicle Controller voltage stabilizing supply electric installation - Google Patents

Abstract

The invention discloses a voltage-stabilized power supply circuit for a vehicle-mounted controller and a voltage-regulated power supply device for a vehicle-mounted controller. The power supply supplies power to the vehicle-mounted controller 5V power supply module through the regulated power supply system, wherein the regulated power supply system includes a DC/DC power supply module and a DC/DC switching frequency selection module, and the DC/DC power supply The modules are respectively connected to the power supply and the 5V power module of the vehicle controller, and the DC/DC switching frequency selection module is connected to the DC/DC power module to adjust the DC/DC switching frequency. It can ensure that the output of the 5V power module of the on-board controller reaches 5V when the voltage of the power supply drops rapidly, which meets the voltage requirements of the on-board controller for the 5V power module.

Description

On-board controller stabilized voltage power supply circuit and on-board controller stabilized voltage power supply device

technical field

The application relates to a voltage-stabilized power supply technology for a low-voltage start-up power supply whose voltage drops rapidly, in particular to a voltage-stabilized power supply circuit for a vehicle-mounted controller and a voltage-stabilized power supply device for a vehicle-mounted controller in the field of the automobile industry.

Background technique

Most of the controllers, actuators, sensors, etc. of the vehicle system are powered by a 5V power supply, and their power supply comes directly from the vehicle battery. Due to factors such as start-stop and vehicle load overload, the battery voltage will quickly drop to about 4.5V, and the normal output of the 5V power supply cannot be guaranteed. The key parameters of the components need to be restarted, and multiple starts will increase energy consumption, and even the car ashtray phenomenon cannot be started due to multiple starts.

For this reason, a common low-voltage start-up solution disclosed in the prior art, as shown in Figure 1, adds a DC/DC (switching power supply) output at the input end of the 5V power supply to ensure the 5V power supply of the vehicle controller The normal working voltage of the module, but the DC/DC (switching power supply) DC/DC switching frequency is fixed, which is suitable for low starting battery voltage slow drop and light load of the vehicle controller, and for its actual working condition, that is, low voltage starting The battery voltage is a rapid drop process, and the load of the controller is generally large when it is working. There are two shortcomings in this solution: one is that the response speed cannot keep up, and the input terminal of the 5V power module of the vehicle controller will still be lower than 5V. The second is that the solution is integrated into the vehicle controller, which needs to change the power supply circuit structure of the existing vehicle controller, which is not conducive to widespread promotion, so the low-voltage start-up problem has not yet been well solved.

Contents of the invention

The present invention aims to solve one of the technical problems in the related art at least to a certain extent. For this reason, an object of the present invention is to propose a vehicle-mounted controller voltage-stabilizing power supply circuit and a vehicle-mounted controller voltage-stabilizing power supply device, which can ensure that the output of the vehicle-mounted controller's 5V power supply module reaches a voltage of 5V when the power supply voltage drops rapidly. .

Another object of the present invention is to propose a voltage-stabilizing power supply device for a vehicle-mounted controller, without changing the original structure of the power supply circuit of the vehicle-mounted controller, through a supplementary module to ensure that the vehicle-mounted The output of the controller 5V power module reaches 5V.

In order to achieve the above object, an embodiment of the present invention proposes a voltage-stabilized power supply circuit for a vehicle-mounted controller. The voltage-stabilized power supply circuit for a vehicle-mounted controller includes a power supply, a voltage-stabilized power supply system, and a 5V power supply module for a vehicle-mounted controller. The power supply supplies power to the vehicle controller 5V power supply module through the regulated power supply system, wherein the regulated power supply system includes a DC/DC power supply module and a DC/DC switching frequency selection module, and the DC/DC power supply module The DC/DC switching frequency selection module is connected to the adjustable frequency interface of the DC/DC power supply module to adjust the DC/DC switching frequency.

According to the embodiment of the present invention, the regulated power supply circuit of the on-board controller can ensure that the DC/DC output satisfies the normal operation of the 5V power input by setting a suitable DC/DC voltage value when the power supply voltage drops rapidly and the on-board controller is under heavy load. Voltage requirements, through the DC/DC switching frequency selection module to realize the selection of the switching frequency of the DC/DC power module, when the power supply drops rapidly and the on-board controller is heavily loaded, it can ensure that all 5V power modules that meet the DC/DC power module output can work normally voltage requirements.

According to another embodiment of the present invention, a vehicle-mounted controller stabilized power supply circuit is provided, including a power supply, a stabilized power supply system, a 5V power supply module, a first anti-reverse module and a second anti-reverse module, the stabilized power supply system It includes a DC/DC power supply module and a DC/DC switching frequency selection module, the input end of the DC/DC power supply module is connected to the power supply, and the output end of the DC/DC power supply module is connected to the The input terminal of the 5V power supply module is connected, the DC/DC switching frequency selection module is connected with the adjustable frequency interface of the DC/DC power supply module to adjust the DC/DC switching frequency, and the power supply is also passed through the second The anti-reverse module is connected to the input end of the 5V power supply module 51 .

In another specific embodiment of the present invention, under normal circumstances, the power supply directly supplies power to the 5V power supply module through the second anti-reverse module. The module supplies power to the 5V power supply module 51 in a bypass mode. By setting an appropriate DC/DC voltage value, it can ensure that the DC/DC output satisfies the normal operation of the 5V power input when the power supply voltage drops rapidly and the vehicle controller is heavily loaded. Voltage requirements, the selection of the switching frequency of the DC/DC power module is realized through the DC/DC switching frequency selection module, which can meet the voltage stability requirements of the 5V power module on the vehicle controller without changing the 5V power module of the vehicle controller. Power supply circuit structure.

According to another embodiment of the present invention, both the first anti-reverse module and the second anti-reverse module are diodes, and the anode of the first anti-reverse module is connected to the output of the DC/DC power supply module. The cathode of the first anti-reverse module is connected to the input terminal of the 5V power supply module, the anode of the second anti-reverse module is connected to the power supply, and the cathode of the second anti-reverse module is connected to the input terminal of the 5V power supply module. Connect to the input terminal of the 5V power module.

According to a further specific embodiment of the present invention, the corresponding switching frequency selection range of the DC/DC switching frequency selection module is 100kHz-2MHz.

Further, in a specific embodiment of the present invention, the corresponding switching frequency of the DC/DC switching frequency selection module is 500 kHz.

According to a specific embodiment of the present invention, the DC/DC power supply module includes a DC/DC control chip, a DC/DC topology, a voltage divider network and a compensation network, wherein the DC/DC control chip controls the On and off, the voltage divider network is connected to the output terminal of the topology for setting the output voltage of the DC/DC power supply, and the voltage divider network is also connected to the DC/DC control chip for sampling DC/DC The output voltage of the power supply, the compensation network is connected with the DC/DC control chip for the stability of the entire DC/DC power supply module.

Further, in a specific embodiment of the present invention, the DC/DC control chip has an adjustable frequency interface, and the adjustable frequency interface is connected to a DC/DC switching frequency selection module.

Further, the DC/DC topology is a Boost topology.

Further, the output voltage set by the DC/DC power supply module is not lower than 1.6 times of the output voltage value of the 5V power supply module.

In order to achieve the above object, another embodiment of the present invention provides a vehicle-mounted controller stabilized voltage power supply device, the vehicle-mounted controller stabilized voltage power supply device includes the above-mentioned vehicle-mounted controller stabilized voltage power supply circuit.

Further specific technical solutions and technical effects will be presented through the following specific examples.

Description of drawings

Fig. 1 is a schematic diagram of the existing on-board controller voltage stabilizing power supply circuit module;

Fig. 2 schematic diagram of the first vehicle-mounted controller voltage-stabilizing power supply circuit and vehicle-mounted controller voltage-stabilizing power supply device of the present invention;

Fig. 3 schematic diagram of the second vehicle-mounted controller voltage-stabilizing power supply circuit and vehicle-mounted controller voltage-stabilizing power supply device of the present invention;

Fig. 4 is the voltage diagram of the power supply drop of the vehicle-mounted controller voltage stabilizing power supply circuit embodiment of the present invention;

Fig. 5 is an effect diagram of the output voltage of the stabilized power supply system 2 under the minimum load of the vehicle controller (vehicle control 5V power supply consumption current is 20mA) of the vehicle controller stabilized power supply circuit of the present invention;

6 is an effect diagram of the output voltage of the stabilized power supply system 2 under the condition of the maximum load of the on-board controller (the consumption current of the 5V power supply of the on-board controller is 1A) in the regulated power supply circuit of the vehicle-mounted controller of the present invention.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

Referring to the accompanying drawings, the circuit module for the regulated power supply of the vehicle controller and the regulated power supply device for the vehicle controller proposed by the embodiments of the present invention will be described below.

As shown in Figure 2, the on-vehicle controller stabilized power supply circuit includes a power supply 1, a stabilized power supply system 2 and an on-vehicle controller 5V power supply module 5, and the power supply 1 is supplied to the vehicle through the stabilized power supply system 2. The controller 5V power supply module 5 supplies power, wherein the regulated power supply system 2 includes a DC/DC power supply module 4 and a DC/DC switching frequency selection module 3, and the input end of the DC/DC power supply module 4 is connected to the power supply 1 , the output end of the DC/DC power supply module 4 is connected to the input end of the vehicle controller 5V power supply module 5, and the DC/DC switching frequency selection module is connected to the adjustable frequency interface of the DC/DC power supply module to Adjust the DC/DC switching frequency.

The on-board controller stabilized power supply system 2 proposed according to the embodiment of the present invention can ensure that the DC/DC output meets 5V power supply input normal working voltage requirements, through the DC/DC switching frequency selection module 3 to realize the selection of the switching frequency of the DC/DC power module 4, when the input of the power supply 1 drops rapidly and the vehicle controller is heavily loaded, the DC/DC power module can be guaranteed 4 The output meets the normal working voltage requirements of the 5V power supply module 5 of the vehicle controller.

The embodiment diagram shown in Figure 2 is an independent working mode, which can provide stable voltage for all 5V power modules of the on-board controller or some 5V power modules of some on-board controllers at the same time, and can also provide a bypass operation In the embodiment of the mode, a stable voltage requirement can be provided for a separate 5V power supply module. As shown in FIG. The first anti-reverse module 6 and the second anti-reverse module 7, the stabilized power supply system 2 includes a DC/DC power supply module 4 and a DC/DC switching frequency selection module 3, the input terminal of the DC/DC power supply module 4 is connected to the The power supply 1 is connected, the output end of the DC/DC power supply module 4 is connected to the input end of the 5V power supply module 51 through the first anti-reverse module 6, and the DC/DC switching frequency selection module 3 is connected to the DC The adjustable frequency interface of the /DC power supply module 4 is connected to adjust the DC/DC switching frequency, and the power supply 1 is also connected to the input end of the 5V power supply module 51 through the second anti-reverse module 7 . In this bypass working mode, one output terminal of the power supply is connected to the first anti-reverse module 6 through the output voltage of the DC/DC power supply module 4, the other is the power supply 1 directly connected to the second anti-reverse module 7, and finally, the anti-reverse The outputs of the module 6 and the anti-reverse module 7 are connected to the input end of the 5V power supply module 51 . Utilizing the parallel connection relationship between the first anti-reverse module 6 and the second anti-reverse module 7, the voltage stabilizing circuit can be operated in a bypass mode, which can ensure the normal output of the 5V power supply without increasing additional hardware development costs.

In the two embodiments of the present invention, on the basis of not changing the structure of the existing vehicle power supply circuit, the voltage stabilized power supply system 2 can supply power to the vehicle controller 5V power supply module 5 in an independent working mode or a bypass working mode to ensure subsequent 5V power supply The output is fine.

As shown in Figure 3, both the first anti-reverse module 6 and the second anti-reverse module 7 are diodes, and the anode of the first anti-reverse module 6 is connected to the output end of the DC/DC power supply module 4 , the cathode of the first anti-reverse module 6 is connected to the input end of the 5V power supply module 51, the anode of the first anti-reverse module 7 is connected to the power supply 1, and the second anti-reverse module 7 The cathode is connected to the input end of the 5V power supply module 51 . It needs to be explained that the first anti-reverse module 6 and the second anti-reverse module 7 are diodes in this embodiment, but they can also constitute anti-reverse modules extending to triodes and MOSFETs (Metal Oxide Semiconductor Field Effect Transistors). To achieve the same technical effect, they should all be included in the scope of protection of this application. Considering that the use of triodes and MOSFETs as anti-reverse modules requires the use of active anti-reverse, this not only causes relatively complicated circuit structures, but also takes up more PCB space. It will also increase the device cost, so the anti-reverse module composed of diodes is preferred in this embodiment.

The DC/DC switching frequency selection module 3 can adjust the switching frequency of DC/DC, and is directly connected to the DC/DC power supply module 4. The corresponding switching frequency selection range of the DC/DC switching frequency selection module 3 is 100kHz～2MHz, and the preferred DC /DC switching frequency is 500kHz.

Further, the DC/DC power supply module 4 includes a DC/DC control chip, a DC/DC topology, a voltage divider network and a compensation network, wherein the DC/DC control chip controls the on-off of the topology, so The voltage dividing network is connected to the output end of the topology for setting the output voltage of the DC/DC power supply, and the voltage dividing network is also connected to the DC/DC control chip for sampling the output voltage of the DC/DC power supply, The compensation network is connected with the DC/DC control chip for the stability of the entire DC/DC power supply module. Among them, the preferred DC/DC control chip has an adjustable frequency interface, and the adjustable frequency interface is used to connect the control chip of the DC/DC switching frequency selection module 3 . The DC/DC topology may be a Boost topology, a SEPIC topology or a Buck-Boost topology, and the Boost topology is preferred in this embodiment.

The voltage divider network is used to set the output voltage of the DC/DC power supply. In addition, the voltage divider network is used as a feedback loop of the DC/DC closed-loop control to sample the output voltage of the DC/DC power supply. Considering the DC/DC output The voltage will generally increase factors such as the anti-reverse circuit and DC/DC response speed. The DC/DC output voltage should be set to more than 1.6 times the output voltage of the 5V power module, preferably 1.8 times.

In this embodiment, the compensation network is used to compensate the phase margin of the closed-loop control loop and the DC/DC response speed, etc., so as to ensure the stable and fast response of the DC/DC operation. The specific preferred network phase margin is 50 °.

The effect of the present invention is described below through specific embodiments, the voltage diagram of power supply drop as shown in Figure 4, the parameter of this power supply voltage drop is taken from the ISO-16756-2 standard that automobile industry carries out, and it is in the actual working condition The standard parameters of the rapid drop voltage of the power supply, the battery voltage U _B = 12V when there is no drop, the rapid drop time t _r = 1ms, and the battery drops to U _s = 4.5V, and at the same time, according to the requirements of the actual operating temperature range of the vehicle, the on-board controller 5V power supply current consumption range I=20mA～1A, DC/DC output voltage is set as 1.8 times of 5V, i.e. 9V output; Fig. 5 vehicle-mounted controller voltage-stabilizing power supply circuit of the present invention is at the minimum load of vehicle-mounted controller (vehicle control 5V power supply Under the condition that the consumption current is 20mA), the effect diagram of the output voltage of the regulated power supply system 2; FIG. The effect diagram of the output voltage of the regulated power supply system 2; through the effect diagram, it can be known that under the above two worst conditions, the DC/DC output voltage is far greater than 5V, which provides sufficient margin for the subsequent 5V power supply voltage input, and can It is a good solution to the problem of rapid drop in voltage of the low-voltage starting power supply.

In addition, as shown in FIG. 2 and FIG. 3 , the present invention also provides a voltage-stabilized power supply device for a vehicle-mounted controller, which includes the voltage-stabilized power supply circuit for a vehicle-mounted controller as described above.

In the description of the present invention, it should be understood that the terms "first" and "second" are used for description purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise specified limit. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims (10)

1. a kind of Vehicle Controller voltage stabilizing power supplying circuit, including power supply, voltage-stabilizing power supply system and Vehicle Controller 5V power supplys Module, the power supply are powered by the voltage-stabilizing power supply system to the Vehicle Controller 5V power modules, and feature exists In the voltage-stabilizing power supply system includes DC/DC power modules and DC/DC switching frequency selecting modules, the DC/DC power modules Be connected respectively with the power supply and the Vehicle Controller 5V power modules, the DC/DC switching frequencies selecting module with The DC/DC power modules are adjusted frequency interface and are connected to adjust DC/DC switching frequencies, and power supply input is quickly fallen During with Vehicle Controller heavy duty, it can ensure that the output of DC/DC power modules meets Vehicle Controller 5V power modules normal work Voltage request.

2. a kind of Vehicle Controller voltage stabilizing power supplying circuit is prevented including power supply, voltage-stabilizing power supply system, 5V power modules, first Reverse block and the second counnter attack module, the voltage-stabilizing power supply system include DC/DC power modules and DC/DC switching frequencies selection mould Block, the DC/DC power modules input terminal are connected with the power supply, described in the DC/DC power module outlets process First counnter attack module is connected with the 5V power modules input terminal, the DC/DC switching frequencies selecting module and DC/DC electricity The adjustable frequency interface of source module is connected to adjust DC/DC switching frequencies, and the power supply is also anti-by described second Reverse block is connected with the input terminal of the 5V power modules, can when supply voltage quickly falls with Vehicle Controller heavy duty Ensure the 5V power inputs normal working voltage requirement that DC/DC outputs meet.

3. Vehicle Controller voltage stabilizing power supplying circuit as claimed in claim 2, it is characterised in that the first counnter attack module and institute It is diode to state the second counnter attack module, and the anode of the first counnter attack module and the output terminal of the DC/DC power modules connect It connects, the cathode of the first counnter attack module is connected with the input terminal of the 5V power modules, the anode of the second counnter attack module It is connected with the power supply, the cathode of the second counnter attack module is connected with the input terminal of the 5V power modules.

4. the Vehicle Controller voltage stabilizing power supplying circuit as described in claims 1 to 3 is any, it is characterised in that the DC/DC switches The corresponding switching frequency selection range of frequency-selecting module 3 is 100kHz ~ 2MHz.

5. Vehicle Controller voltage stabilizing power supplying circuit as claimed in claim 4, it is characterised in that the DC/DC switching frequencies selection The corresponding switching frequency of module is 500kHz.

6. the Vehicle Controller voltage stabilizing power supplying circuit as described in claims 1 to 3 is any, it is characterised in that the DC/DC power supplys Module includes DC/DC controls chip, DC/DC topological structures, partial pressure network and resonant earthed system, wherein the DC/DC controls chip The break-make of topological structure is controlled, the partial pressure network connects the output terminal of the topological structure for setting the output of DC/DC power supplys Voltage, the partial pressure network also are connected to sample DC/DC electric power output voltages, the benefit with DC/DC control chips Network is repaid to be connected for the stability of entire DC/DC power modules with DC/DC control chips.

7. Vehicle Controller voltage stabilizing power supplying circuit as claimed in claim 6, it is characterised in that the DC/DC controls chip has Frequency-adjustable section interface, frequency-adjustable section interface connection DC/DC switching frequency selecting modules.

8. Vehicle Controller voltage stabilizing power supplying circuit as claimed in claim 6, it is characterised in that the DC/DC topological structures are Boost topological structures.

9. the Vehicle Controller voltage stabilizing power supplying circuit as described in claim 2 and 3 is any, it is characterised in that the DC/DC power supplys The output voltage of module setting is not less than 1.6 times of the 5V power modules output voltage values.

10. a kind of Vehicle Controller voltage stabilizing supplies electric installation, it is characterised in that including the vehicle-mounted control as described in claim 1-9 is any Device voltage stabilizing power supplying circuit processed.