Power supply architecture of emergency power supply, control method, power supply module and motor controller

Abstract

The invention provides a power supply framework of an emergency power supply, a control method, a power supply module and a motor controller, and relates to the technical field of new energy automobiles, and the power supply framework comprises a low-voltage power supply end which supplies power to a lower bridge driving circuit; the high-voltage power supply end is connected with the high-voltage flyback power supply so as to output emergency power supply for the lower bridge driving circuit; the output end of the PWM control chip is connected with the high-voltage flyback power supply so as to control the on-off of the high-voltage flyback power supply; the input end of the diode is connected with the output of the lower bridge driving circuit, and the output end of the diode is connected with the PWM control chip; the low-voltage power supply end supplies power to the PWM control chip through the output of the lower bridge driving circuit so as to start the high-voltage flyback power supply, and the high-voltage flyback power supply takes power from the high-voltage power supply end so as to output emergency power supply. The circuit arrangement is complex; and the loss is large.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to a power supply circuit, a power module and a motor controller of an emergency power supply. Background Art

[0002] With the advancement of technology, new energy vehicles are developing faster and faster. Among them, in new energy motor controllers with functional safety requirements, when the circuit is abnormal, an emergency power supply is required to supply power to the circuit that performs the ASC (active short circuit) action, including the active short circuit control logic circuit and the lower bridge drive circuit, etc., to ensure safe torque shutdown and thus ensure the torque safety of the entire vehicle and the safety of the power battery system.

[0003] Most of the existing emergency power supply architectures include a high-resistance or high-voltage starting circuit, a PWM control chip and an isolated high-voltage flyback power supply topology. Specifically, the high-resistance or high-voltage starting circuit draws power from the DC bus (i.e., the high-voltage power supply end), and then supplies power to the PWM control chip to control the start-up of the isolated high-voltage flyback power supply topology. However, in this process, the high-resistance or high-voltage starting circuit is mostly arranged with multiple resistors, voltage regulators or high-voltage triodes and other devices, with a complex design. The PWM control chip has a low power supply, but draws power from the high voltage, resulting in more energy loss in each device of the high-resistance or high-voltage starting circuit. Summary of the invention

[0004] In order to overcome the above-mentioned technical defects, the purpose of the present invention is to provide a power supply architecture, control method, power module and motor controller of an emergency power supply, so as to solve the problem that the PWM control chip in the existing emergency power supply draws power from the DC bus through a high-resistance or high-voltage starting circuit, the circuit layout is complex and the loss is large.

[0005] The present invention discloses a power supply architecture of an emergency power supply, comprising:

[0006] Low voltage power supply terminal, supplying power to the lower bridge drive circuit;

[0007] A high-voltage power supply terminal is connected to a high-voltage flyback power supply to output emergency power supply for the lower bridge drive circuit;

[0008] A PWM control chip, whose output end is connected to the high-voltage flyback power supply to control the on and off of the high-voltage flyback power supply;

[0009] A diode, the input end of which is connected to the output of the lower bridge drive circuit, and the output end of which is connected to the PWM control chip;

[0010] The low-voltage power supply end supplies power to the PWM control chip through the output of the lower bridge drive circuit to start the high-voltage flyback power supply, and the high-voltage flyback power supply draws power from the high-voltage power supply end to output emergency power supply.

[0011] Preferably, the high-voltage flyback power supply includes a primary winding and a secondary winding located on both sides of the isolator, and a feedback winding connected to the PWM control chip, the primary winding is connected to the high-voltage power supply end, and the secondary winding outputs an emergency power supply;

[0012] After the high-voltage flyback power supply is started, when the output of the feedback winding is higher than the output of the lower bridge drive circuit, the PWM control chip is powered through the feedback winding.

[0013] Preferably, the diode output end is connected to the VDD pin of the PWM control chip;

[0014] The feedback winding is connected between the VDD pin and the VS pin of the PWM control chip.

[0015] Preferably, a unidirectional conduction tube is provided between the feedback winding and the VDD pin of the PWM control chip;

[0016] The input end of the unidirectional guide tube is connected to the feedback winding, and the output end is connected to the VDD pin of the PWM control chip.

[0017] Preferably, the output end of the PWM control chip is connected to the primary winding through a MOS device to control the on and off of the high-voltage flyback power supply.

[0018] Preferably, a conversion circuit is connected between the low-voltage power supply terminal and the lower bridge drive circuit.

[0019] The present invention also provides a power supply control method for an emergency power supply, applying any of the power supply architectures described above, comprising:

[0020] The output of the lower bridge drive circuit supplies power to the PWM control chip to start the high-voltage flyback power supply;

[0021] When the emergency power supply is triggered, the high-voltage flyback power supply takes power from the high-voltage power supply end to output the emergency power supply;

[0022] The power supply of the PWM control chip is maintained based on the emergency power supply or the feedback winding in the high-voltage flyback power supply.

[0023] Preferably, when the output of the feedback winding is higher than the output of the lower bridge drive circuit, the PWM control chip is powered through the feedback winding.

[0024] The present invention also provides a power supply module, applying any of the power supply architectures described above.

[0025] The present invention also provides a motor controller using the above power module.

[0026] Compared with the prior art, the above technical solution has the following beneficial effects:

[0027] The present application provides a power supply architecture, control method, power module and motor controller for an emergency power supply. A diode is used to connect the output of a lower bridge drive circuit to supply power to a PWM control chip, so that the PWM control chip controls the start of a high-voltage flyback power supply to draw power from the high voltage and outputs an emergency power supply for the lower bridge drive circuit. There is no need for a power supply circuit with multiple high-resistance components, thereby reducing the complexity, safety risks and losses of the circuit architecture. After the high-voltage flyback power supply is started, the PWM control chip can also be continuously powered through the feedback winding thereon, thereby solving the problem that the PWM control chip in the existing emergency power supply draws power from the DC bus through a high-resistance or high-voltage starting circuit, resulting in complex circuit layout, high safety risks and large losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the circuit structure of an embodiment of a power supply architecture, a control method, a power module and a motor controller of an emergency power supply according to the present invention;

[0029] Figure 2 The present invention is a schematic diagram of a circuit structure in which a lower bridge drive circuit supplies power to the PWM control chip according to a power supply architecture, a control method, a power module and a motor controller embodiment of an emergency power supply.

[0030] Reference numerals:

[0031] 1- low voltage power supply end; 11- lower bridge drive circuit / lower bridge drive isolation power supply; 2- high voltage power supply end; 3- PWM control chip; 4- diode; 5- high voltage flyback power supply / high voltage flyback circuit; 51- winding. DETAILED DESCRIPTION

[0032] The advantages of the present invention are further described below in conjunction with the accompanying drawings and specific embodiments.

[0033] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0034] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0035] It should be understood that although the terms first, second, third, etc. may be used in the present disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0036] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0038] In the following description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present invention, and have no specific meanings. Therefore, "module" and "component" can be used interchangeably.

[0039] Embodiment: This embodiment discloses an emergency power supply architecture, which is used for emergency power supply to the lower bridge drive circuit, and is suitable for triggering the ASC mode in a new energy motor controller with functional safety requirements, etc., where emergency power supply to the lower bridge drive circuit is required. For details, refer to Figure 1-Figure 2 ,include:

[0040] The low voltage power supply terminal KL30 supplies power to the lower bridge drive circuit, and its output is P17V (low voltage);

[0041] The high-voltage power supply end is connected to a high-voltage flyback power supply / high-voltage flyback circuit to output an emergency power supply P13V for the lower bridge drive circuit;

[0042] A PWM control chip, whose output end is connected to the high-voltage flyback power supply to control the on and off of the high-voltage flyback power supply;

[0043] Diode D7, the input end of which is connected to the output P17V of the lower bridge drive circuit (the connected lower bridge drive isolation power supply, i.e., the isolation power supply module that provides power for the lower bridge drive circuit), and the output end of which is connected to the PWM control chip;

[0044] The low-voltage power supply end powers the PWM control chip through the output P17V of the lower bridge drive circuit (lower bridge drive isolation power supply) to start the high-voltage flyback power supply, and the high-voltage flyback power supply draws power from the high-voltage power supply end to output the emergency power supply P13V.

[0045] In this embodiment, the output P17V of the lower bridge drive circuit is used to provide power for the PWM control chip through the diode D7. This is different from the existing architecture of powering the PWM control chip from the high-voltage power supply end through a high-resistance or high-voltage starting circuit. The PWM control chip is powered from the low-voltage power supply end, thereby reducing the complexity of the circuit layout. At the same time, there is no need to arrange high-resistance devices, and there will not be much energy loss. In addition, high-voltage power will not be directly drawn. If the low voltage is not supplied, even the high voltage power supply cannot work directly, thereby improving the safety of use.

[0046] As an illustration, when power is drawn from the high-voltage power supply terminal through a high-resistance or high-voltage starting circuit, in addition to the complex layout, due to maintaining the connection of the high-voltage power supply terminal, high-resistance devices will generate more heat under long-term use, which not only causes more energy loss, but also requires more heat dissipation structures / components to be arranged in the application scenario, thereby further increasing the complexity of the overall structure, space occupancy, cost, etc.

[0047] In this embodiment, the diode D7 is used so that the output P17V of the lower bridge drive circuit supplies power to the PWM control chip, thereby greatly reducing the device layout. At the same time, even if the power supply of the PWM control chip is maintained, the low-voltage power supply terminal KL30 (small battery) and the diode D7 will not generate a large heat output, thereby reducing energy loss. And it can be understood as multiplexing the low-voltage power supply of the lower bridge drive circuit, thereby optimizing the power supply architecture. It should be noted that under this power supply architecture, the low-voltage power supply terminal enables the output P17V of the lower bridge drive circuit to supply power to the PWM control chip, control the start-up of the high-voltage flyback power supply, and after it is started, it takes power from the high-voltage power supply terminal. Therefore, both the low-voltage power supply terminal and the high-voltage power supply terminal need to have outputs, that is, both the low-voltage and high-voltage power-ups are powered on, so that power supply can be achieved, thereby improving the safety of the use process.

[0048] In addition, the function of the output P17V of the low-voltage power supply terminal KL30 / lower bridge drive circuit is to start the high-voltage power supply, that is, the start-up of the emergency power supply. After starting, the high-voltage flyback power supply can continue to draw power from the high voltage. When the low-voltage power supply terminal KL30 is powered off or abnormal, the emergency power supply is also output from the high voltage. After the operation is completed, the power supply of the PWM control chip can be achieved by maintaining the output P17V of the low-voltage power supply terminal / lower bridge drive circuit, or when the low-voltage power supply terminal is powered off or abnormal, the emergency power supply / lower bridge drive circuit output P17V is achieved, and power can also be drawn from the feedback winding in the high-voltage flyback power supply.

[0049] Specifically, the high-voltage flyback power supply includes a primary winding Np and a secondary winding Ns located on both sides of the isolator, and a feedback winding Na connected to the PWM control chip, the primary winding Np is connected to the high-voltage power supply end, and the secondary winding Ns outputs an emergency power supply P13V; after the high-voltage flyback power supply is started, when the output of the feedback winding Na is higher than the output P17V of the lower bridge drive circuit, the PWM control chip is powered through the feedback winding Na.

[0050] The above-mentioned high-voltage flyback power supply (isolated high-voltage flyback power supply topology) can include the existing general architecture of the above-mentioned various windings. In order to realize the power supply of the PWM control chip after the above-mentioned high-voltage flyback power supply is started, the feedback winding Na is connected between the VDD pin and the VS pin of the PWM control chip. The feedback winding Na can also provide output voltage information, realize valley switching and sampling input, etc., so as to realize accurate control of the output emergency power supply P13V. This primary feedback control method can simplify circuit design, reduce the number of external components, reduce costs, and improve the stability and response speed of the system.

[0051] Specifically, the output end of the diode D7 is connected to the PWM control chip, and specifically the output end of the diode D7 is connected to the VDD pin of the PWM control chip. Based on the above, the feedback winding Na is also connected to the VDD pin of the PWM control chip. In order to improve the circuit safety, a unidirectional conduction tube D2 is provided between the feedback winding Na and the VDD pin of the PWM control chip; the input end of the unidirectional conduction tube D2 is connected to the feedback winding Na, and the output end is connected to the VDD pin of the PWM control chip, thereby reducing the risk caused by conduction between the feedback winding and the VDD pin of the PWM control chip before powering the PWM control chip.

[0052] In this embodiment, based on the above, the VDD pin (input) of the PWM control chip is connected to the output and feedback winding of the lower bridge drive circuit. When the high-voltage flyback power supply is turned on, the output P17V of the lower bridge drive circuit and the feedback winding Na are both in the on state. Therefore, at this time, the end with higher power supply is used as the power supply input. Since the feedback winding Na is powered by high voltage, it is likely to be higher than the output P17V of the lower bridge drive circuit. That is, when the output of the feedback winding Na is higher than the output P17V of the lower bridge drive circuit, the PWM control chip is powered through the feedback winding Na, thereby reducing the output energy consumption of the low-voltage power supply end and improving the safety of the use process.

[0053] In this embodiment, the output end of the PWM control chip is connected to the primary winding Np through a MOS device to control the on and off of the high-voltage flyback power supply. As an option, the above-mentioned MOS device can also be replaced by other controllable conductive devices. Further, as an option, a conversion circuit is connected between the low-voltage power supply terminal KL30 and the lower bridge drive circuit. Specifically, Figure 2 As illustrated, the conversion circuit includes but is not limited to a boost circuit, a buck circuit, an anti-reverse circuit, a filter circuit, a reverse circuit, etc., and can be specifically arranged according to actual scenarios.

[0054] Based on the above, the power supply architecture provided by this embodiment uses a diode D7 to connect the output P17V of the lower bridge drive circuit to power the PWM control chip, so that the PWM control chip starts the high-voltage flyback power supply to take power from the high voltage to output the emergency power supply P13V for the lower bridge drive circuit, which is different from the high-voltage startup circuit arranged with high resistance or including several high-resistance modules in the existing architecture, reduces the complexity of the circuit architecture, and the low-voltage power supply KL30 and the diode D7 effectively reduce the loss, and it can only be started after both the low-voltage power supply and the high-voltage power supply are turned on, further improving safety. Furthermore, after starting the high-voltage flyback power supply, the PWM control chip can also be continuously powered through the feedback winding Na thereon, reducing the consumption of the low-voltage power supply, even if the subsequent low-voltage power supply terminal Kl 30 is abnormal, the emergency power supply P13V is output to the lower bridge drive circuit through the high-voltage flyback power supply.

[0055] This embodiment also provides a power supply control method for an emergency power supply, applying any of the power supply architectures described above, including: the output P17V of the lower bridge drive circuit is used to power the PWM control chip to start the high-voltage flyback power supply; when the emergency power supply P13V is triggered, the high-voltage flyback power supply takes power from the high-voltage power supply end to output the emergency power supply P13V; and the power supply of the PWM control chip is maintained based on the emergency power supply P13V or the feedback winding Na in the high-voltage flyback power supply.

[0056] In this embodiment, it should be noted that for the above-mentioned power supply architecture, the PWM control chip is powered by the output (low-voltage output) P17V of the lower bridge drive circuit to start the high-voltage flyback power supply to output the emergency power supply P13V for the lower bridge drive circuit from the high voltage; when the high-voltage flyback power supply is started, the output of the lower bridge drive circuit can be maintained to power the PWM control chip, or the feedback winding in the high-voltage flyback power supply can be used to power the PWM control chip, thereby saving low-voltage power supply; when the low-voltage power supply is abnormal, the lower bridge drive circuit is powered by the emergency power supply. At this time, the emergency power supply with high-voltage power output can maintain the output of the lower bridge drive circuit to power the PWM control chip, or the feedback winding can be used to power the PWM control chip.

[0057] Specifically, in the above control method, when the output of the feedback winding Na is higher than the output P17V of the lower bridge drive circuit, the PWM control chip is powered by the feedback winding Na. The lower bridge drive circuit output P17V or the feedback winding Na can power the PWM control chip. Therefore, the two are compared to determine the one with higher output for power supply. It can be understood that the feedback winding Na comes from high voltage power supply, which is higher than the output P17V of the low voltage power supply end in most cases, thereby reducing the consumption of low voltage output.

[0058] In this embodiment, the emergency power supply P13V for the lower bridge drive circuit is started by low voltage and high voltage power supply. Different from the existing high-resistance circuit that draws power from high voltage, the output of the lower bridge drive circuit is used to power the PWM control chip. After the PWM control chip starts the high-voltage flyback power supply, the high voltage power is used to output the emergency power supply P13V, and the PWM control chip can also be powered in reverse through the feedback winding therein. There is no need to power the PWM control chip through multiple high-resistance devices, thereby reducing energy consumption and improving response efficiency and safety.

[0059] It is understandable that one or more devices such as other resistors and conduction tubes can be connected to the above-mentioned power supply structure to meet the usage requirements in different scenarios without affecting the above-mentioned control and power supply, and each device is grounded to ensure the safety of the entire power supply structure.

[0060] This embodiment also provides a power module, using any of the power supply architectures described above. Further, this embodiment also provides a motor controller, using the power module, the power module and the motor controller can be used in the electric control system of new energy vehicles, and specifically, can also be connected with other components and / or devices to meet the needs of different usage scenarios.

[0061] It should be noted that the embodiments of the present invention have better practicability and do not impose any form of limitation on the present invention. Any technician familiar with the field may use the technical content disclosed above to change or modify it into an equivalent effective embodiment. However, any modification or equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An emergency power supply architecture, characterized in that: include: Low voltage power supply terminal, supplying power to the lower bridge drive circuit; A high-voltage power supply terminal is connected to a high-voltage flyback power supply to output emergency power supply for the lower bridge drive circuit; A PWM control chip, whose output end is connected to the high-voltage flyback power supply to control the on and off of the high-voltage flyback power supply; A diode, the input end of which is connected to the output of the lower bridge drive circuit, and the output end of which is connected to the PWM control chip; The low-voltage power supply end supplies power to the PWM control chip through the output of the lower bridge drive circuit to start the high-voltage flyback power supply, and the high-voltage flyback power supply draws power from the high-voltage power supply end to output emergency power supply.

2. The power supply architecture according to claim 1, characterized in that: The high-voltage flyback power supply includes a primary winding and a secondary winding located on both sides of the isolator, and a feedback winding connected to the PWM control chip, the primary winding is connected to the high-voltage power supply end, and the secondary winding outputs an emergency power supply; after the high-voltage flyback power supply is started, when the output of the feedback winding is higher than the output of the lower bridge drive circuit, the PWM control chip is powered through the feedback winding.

3. The power supply architecture according to claim 2, wherein: The diode output end is connected to the VDD pin of the PWM control chip; The feedback winding is connected between the VDD pin and the VS pin of the PWM control chip.

4. The power supply architecture according to claim 3, characterized in that: A unidirectional conduction tube is provided between the feedback winding and the VDD pin of the PWM control chip; The input end of the unidirectional guide tube is connected to the feedback winding, and the output end is connected to the VDD pin of the PWM control chip.

5. The power supply architecture according to claim 2, wherein: The output end of the PWM control chip is connected to the primary winding through a MOS device to control the on and off of the high-voltage flyback power supply.

6. The power supply architecture according to claim 1, wherein: A conversion circuit is connected between the low-voltage power supply end and the lower bridge drive circuit.

7. A power supply control method for an emergency power supply, characterized in that: The power supply architecture according to any one of claims 1 to 6 above includes: The output of the lower bridge drive circuit supplies power to the PWM control chip to start the high-voltage flyback power supply; When the emergency power supply is triggered, the high-voltage flyback power supply takes power from the high-voltage power supply end to output the emergency power supply; The power supply of the PWM control chip is maintained based on the emergency power supply or the feedback winding in the high-voltage flyback power supply.

8. The power supply control method according to claim 7, characterized in that: When the output of the feedback winding is higher than the output of the lower bridge driving circuit, the PWM control chip is powered through the feedback winding.

9. A power module, characterized in that: Apply the power supply architecture described in any one of claims 1 to 6 above.

10. A motor controller, characterized in that: The power module according to claim 9 is used.

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