Circuit, DC / DC, vehicle, method and medium for detecting short circuit of redundant DC / DC half bridge

Abstract

The present invention provides an identification circuit for redundant DC / DC half-bridge short circuits, the identification circuit comprising an identification control subcircuit, a control switch, a high-voltage side sampling device, and a low-voltage side sampler. The control switch connects the energy conversion unit of the DC / DC and the low-voltage side switch; the high-voltage side sampling device collects high-voltage side circuit information at both ends of the high-voltage side switch; the low-voltage side sampling device collects low-voltage side circuit information at both ends of the low-voltage side control subcircuit; the input end of the identification control subcircuit is connected to the high-voltage side sampling device and the low-voltage side sampling device. The identification control subcircuit identifies whether the energy conversion unit has a short-circuit fault based on the high-voltage side circuit information and the low-voltage side circuit information of the energy conversion unit in a working state. The identification circuit for redundant DC / DC half-bridge short circuits provided by the present invention can accurately identify short-circuit faults in redundant DC / DC fault paths, ensure the single-channel output function of the redundant DC / DC, and improve the availability and safety of the product.

Description

Technical Field

[0001] The present invention relates to the field of circuit control technology, and in particular to a circuit, DC / DC, vehicle, method and medium for identifying a redundant DC / DC half-bridge short circuit. Background Art

[0002] The DC / DC converter in new energy vehicles converts high-voltage DC power to low-voltage DC power to power the low-voltage battery and loads, including traditional 12V loads and safety loads. The DC / DC converter can also convert low-voltage DC power to high-voltage DC power to power the high-voltage battery. With the advancement of automotive technology, intelligent connected vehicles are placing higher demands on onboard power supply units. In the event of a DC / DC failure, it must enter a derated output state while continuing to provide power to 12V loads to enable the vehicle's limp home function and maintain power to safety loads, thereby improving vehicle safety.

[0003] To this end, one of the existing methods is to implement this function by designing the DC / DC energy conversion unit redundantly. Figure 1 , Figure 1 FIG. 1 is a circuit diagram of a DC / DC circuit with redundant energy conversion units in the prior art. Figure 1 As can be seen, the DC / DC has two parallel-connected energy conversion units 130a and 130b, which can respectively perform high-voltage and low-voltage energy conversion to power the 12V low-voltage side battery 150 and the 12V load 6. When an abnormality occurs in the energy conversion unit 130a (or the energy conversion unit 130b), the protection unit 212 collects circuit information (including voltage, current, temperature, etc.) through the sampling unit 211 to monitor the abnormality, and opens the high-side switch 120a and the low-voltage side switch 140a (or the high-side switch 2b and the low-voltage side switch 4b) through the drive unit 214, and transmits the abnormality information to the control unit 213. After receiving the abnormality information, the control unit 213 controls the drive unit 214 to maintain the normal operation of the energy conversion unit 130b (energy conversion unit 130a).

[0004] However, since the energy conversion units 130a and 130b are connected to the same high-voltage side battery 110, the same low-voltage side battery 150 and the load 160, when a half-bridge upper tube short circuit occurs in one of the paths (the fault path, such as 130a), due to the electrical coupling between the two paths, the other path (the normal path, such as 130b) will also report a fault, causing the DC / DC to be unable to maintain normal operation.

[0005] Therefore, how to overcome the above-mentioned defects in the prior art and provide a circuit or method for identifying redundant DC / DC half-bridge short circuits to better realize the original intention of the redundant energy conversion unit design and thus improve the safety performance of the entire vehicle has become a technical problem that is increasingly being solved by those skilled in the art.

[0006] It should be noted that the information disclosed in the background technology section of the invention is only intended to deepen the understanding of the general background technology of the invention, and should not be regarded as an admission or any form of implication that the information constitutes prior art already known to those skilled in the art. Summary of the Invention

[0007] The object of the present invention is to address the above-mentioned deficiencies in the prior art and to provide a circuit, DC / DC, vehicle, method, and medium for identifying a redundant DC / DC half-bridge short circuit, so as to accurately identify a short circuit fault in the redundant DC / DC fault path, ensure the single-channel output function of the redundant DC / DC, and thus improve the availability and safety of the product.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a circuit for identifying a redundant DC / DC half-bridge short circuit, wherein the DC / DC includes a high-voltage side battery, a low-voltage side battery, at least two energy conversion units, and a high-voltage side switch and a low-voltage side switch corresponding to each of the energy conversion units; each of the energy conversion units is connected to the high-voltage side battery via its corresponding high-voltage side switch and to the low-voltage side battery via its corresponding low-voltage side switch;

[0009] The identification circuit includes an identification control subcircuit, and a control switch, a high-voltage side sampling device and a low-voltage side sampling device corresponding to each of the energy conversion units;

[0010] For each of the energy conversion units: the control switch connects the energy conversion unit and the low-voltage side switch; the high-voltage side sampling device is configured to collect high-voltage side circuit information at both ends of the high-voltage side switch; the low-voltage side sampling device is configured to collect low-voltage side circuit information at both ends of the low-voltage side control subcircuit formed by the control switch and the low-voltage side switch;

[0011] The input end of the identification control subcircuit is connected to the high-voltage side sampling device and the low-voltage side sampling device of each energy conversion unit, and the output end of the identification control subcircuit is connected to the high-voltage side switch, the control switch and the low-voltage side switch of each energy conversion unit;

[0012] The identification control subcircuit is configured to identify whether the energy conversion unit has a short circuit fault based on the high-voltage side circuit information and the low-voltage side circuit information of the energy conversion unit in a working state.

[0013] Optionally, the high-voltage side sampling device includes a first voltage sampling element, a second voltage sampling element and a current sampling element;

[0014] Wherein, the first voltage sampling element is arranged between the high-voltage side battery and the high-voltage side switch; the second voltage sampling element is arranged between the high-voltage side switch and the energy conversion unit; and the current sampling element is arranged between the high-voltage side switch and the energy conversion unit;

[0015] The input end of the identification control subcircuit is connected to the high-voltage side sampling device of each energy conversion unit, including:

[0016] An input end of the identification control subcircuit is connected to the first voltage sampling element, the second voltage sampling element, and the current sampling element.

[0017] Optionally, the low-voltage side sampling device includes a third voltage sampling element and a fourth voltage sampling element;

[0018] Wherein, the third voltage sampling element is arranged between the energy conversion unit and the low-voltage side control subcircuit, and the fourth voltage sampling element is arranged between the low-voltage side control subcircuit and the low-voltage side battery;

[0019] The input end of the identification control subcircuit is connected to the low-voltage side sampling device of each energy conversion unit, including:

[0020] An input terminal of the identification control subcircuit is connected to the third voltage sampling element and the fourth voltage sampling element.

[0021] Optionally, the high-side switch is a first NMOS transistor / first PMOS transistor, a drain / source of the first NMOS transistor / first PMOS transistor is connected to the high-side battery, a source / drain of the first NMOS transistor / first PMOS transistor is connected to the energy conversion unit, and a gate of the first NMOS transistor / first PMOS transistor is connected to the output end of the identification control subcircuit;

[0022] and / or

[0023] The control switch is a second NMOS tube / a second PMOS tube, the low-voltage side switch is a third NMOS tube / a third PMOS tube, the drain / source of the second NMOS tube / the second PMOS tube is connected to the energy conversion unit, the source / drain of the second NMOS tube / the second PMOS tube is connected to the source / drain of the third NMOS tube / the third PMOS tube, and the drain / source of the third NMOS tube / the third PMOS tube is connected to the low-voltage side battery;

[0024] The output end of the identification control subcircuit is connected to the low-voltage side switch and the control switch of each energy conversion unit, including:

[0025] The output end of the identification control subcircuit is connected to the gate / gate of the second NMOS transistor / the second PMOS transistor and the gate / gate of the third NMOS transistor / the third PMOS transistor.

[0026] Optionally, the energy conversion unit includes a first capacitor, a fourth NMOS transistor / a fourth PMOS transistor, a fifth NMOS transistor / a fifth PMOS transistor, an inductor, and a second capacitor;

[0027] One end of the first capacitor, the drain / source of the fourth NMOS transistor / fourth PMOS transistor, and one end of the high-side switch are commonly connected;

[0028] The source / drain of the fourth NMOS transistor / fourth PMOS transistor, the drain / source of the fifth NMOS transistor / fifth PMOS transistor, and one end of the inductor are connected in common;

[0029] The other end of the inductor, one end of the second capacitor and one end of the low-voltage side control sub-circuit are connected in common;

[0030] The other end of the first capacitor, the source / drain of the fifth NMOS transistor / fifth PMOS transistor, and the other end of the second capacitor are connected to the ground.

[0031] Optionally, the identification control subcircuit includes a sampling unit, a protection unit, a control unit and a driving unit;

[0032] The input end of the sampling unit is connected to the high-voltage side sampling device and the low-voltage side sampling device of each energy conversion unit, and the output end of the sampling unit is connected to the input end of the protection unit; the input end of the control unit is connected to the output end of the sampling unit and the output end of the protection unit; the output end of the protection unit and the output end of the control unit are connected to the input end of the driving unit, and the output end of the driving unit is connected to the low-voltage side switch, the control switch and the high-voltage side switch;

[0033] The sampling unit is configured to send the high-voltage side circuit information and the low-voltage side circuit information to the protection unit and the control unit;

[0034] The protection unit is configured to determine whether a high-voltage side overcurrent fault or a low-voltage side overvoltage fault occurs based on the high-voltage side circuit information and the low-voltage side circuit information, and to send a determination result of the high-voltage side overcurrent fault or the low-voltage side overvoltage fault to the control unit;

[0035] The control unit is configured to determine whether the energy conversion unit has a short circuit fault according to the judgment result of the high-voltage side overcurrent fault or the low-voltage side overvoltage fault, and the high-voltage side circuit information and the low-voltage side circuit information;

[0036] The protection unit and the control unit are further configured to drive the drive unit to control the disconnection / connection states of the high-voltage side switch, the low-voltage side switch, and the control switch.

[0037] According to a second aspect of the present invention, the present invention further provides a DC / DC, wherein the DC / DC includes any one of the above-mentioned circuits for identifying a short circuit of a redundant DC / DC half-bridge.

[0038] According to a third aspect of the present invention, the present invention further provides a vehicle, comprising the above-mentioned DC / DC.

[0039] According to a fourth aspect of the present invention, the present invention also provides a method for identifying a redundant DC / DC half-bridge short circuit. The identification method is based on the identification circuit for a redundant DC / DC half-bridge short circuit described in any one of the above items, comprising: for each of the energy conversion units, based on the collected high-voltage side circuit information and low-voltage side circuit information of the energy conversion unit, identifying whether the energy conversion unit has a short circuit fault.

[0040] Optionally, the high-voltage side circuit information includes a high-voltage side current value, a first voltage value, and a second voltage value, wherein the first voltage value is the voltage value of one end of the high-voltage side switch connected to the high-voltage side battery, and the second voltage value is the voltage value of the other end of the high-voltage side switch;

[0041] The low-voltage side circuit information includes a third voltage value and a fourth voltage value, the third voltage value is the voltage value of one end of the low-voltage side control subcircuit connected to the energy conversion unit, and the fourth voltage value is the voltage value of the other end of the low-voltage side control subcircuit;

[0042] The step of identifying whether the energy conversion unit has a short circuit fault based on the collected high-voltage side circuit information and low-voltage side circuit information of the energy conversion unit includes:

[0043] S11: Determine whether it is a low-voltage side overvoltage fault or a high-voltage side overcurrent fault. If so, execute step 12; if not, the energy conversion unit does not have a short-circuit fault; wherein the method for determining the high-voltage side overcurrent fault includes the high-voltage side current value exceeding a first threshold; the method for determining the low-voltage side overvoltage fault includes the third voltage value exceeding a second threshold;

[0044] S12: If the fault is an overvoltage fault on the low-voltage side, determine whether the energy conversion unit has a short-circuit fault using a first judgment strategy based on the first voltage value, the second voltage value, the third voltage value, the fourth voltage value, the third threshold value, and the fourth threshold value;

[0045] If it is a high-voltage side overcurrent fault, execute step S13;

[0046] S13: Based on the first voltage value, the second voltage value, the third voltage value, the fourth voltage value, the third threshold value, the fourth threshold value and the fifth threshold value, a second judgment strategy is adopted to judge whether the upper tube of the energy conversion unit has a short circuit fault.

[0047] Optionally, the energy conversion unit includes a first capacitor, a fourth NMOS transistor / PMOS transistor, a fifth NMOS transistor / PMOS transistor, an inductor, and a second capacitor;

[0048] One end of the first capacitor, the drain / source of the fourth NMOS transistor / PMOS transistor, and one end of the high-side switch are connected in common;

[0049] The source / drain of the fourth NMOS / PMOS transistor, the drain / source of the fifth NMOS / PMOS transistor, and one end of the inductor are connected in common;

[0050] The other end of the inductor, one end of the second capacitor and one end of the low-voltage side control sub-circuit are connected in common;

[0051] The other end of the first capacitor, the source / drain of the fifth NMOS transistor / PMOS transistor and the other end of the second capacitor are connected to the ground;

[0052] In step S12, the first judgment strategy is used to judge whether the energy conversion unit has a short circuit fault based on the first voltage value, the second voltage, the third voltage value, the fourth voltage value, the third threshold value, and the fourth threshold value, including:

[0053] Determine whether the third voltage value > (the fourth voltage value + the third threshold) and the second voltage value < (the first voltage value - the fourth threshold). If so, the upper tube (the fourth NMOS tube / PMOS tube) of the energy conversion unit has a short circuit fault; if not, the overvoltage fault is caused by control abnormality.

[0054] Optionally, in step S13, the determining whether the upper tube of the energy conversion unit has a short circuit fault using a second judgment strategy based on the first voltage value, the second voltage value, the third voltage value, the fourth voltage value, the third threshold value, the fourth threshold value, and the fifth threshold value includes:

[0055] Determine whether the second voltage value is less than (the first voltage value - the fifth threshold value). If so, the first capacitor of the energy conversion unit has a short circuit fault; if not, determine whether the third voltage value is greater than (the fourth voltage value + the third threshold value) and the second voltage value is less than (the first voltage value - the fourth threshold value). If so, the fourth NMOS tube / PMOS tube of the energy conversion unit has a short circuit fault; if not, the overcurrent fault is caused by control abnormality.

[0056] Optionally, the identification method further includes:

[0057] If a short circuit fault occurs in the energy conversion unit, the high-voltage side switch, the control switch, and the low-voltage side switch of the energy conversion unit are controlled to be in a disconnected state; and the high-voltage side switch, the control switch, and the low-voltage side switch of other non-faulty energy conversion units are controlled to be in a connected state;

[0058] Otherwise, the high-voltage side switch, the control switch and the low-voltage side switch of the energy conversion unit are controlled to be in a connected state.

[0059] According to a fourth aspect of the present invention, the present invention further provides a computer-readable storage medium, wherein the computer program is stored in the computer-readable storage medium. When the computer program is executed by a processor, the method for identifying a redundant DC / DC half-bridge short circuit as described in any one of the above items is implemented.

[0060] Compared with the prior art, the present invention provides a circuit, a DC / DC, a vehicle, a method, and a medium for identifying a redundant DC / DC half-bridge short circuit, which has the following beneficial effects:

[0061] The present invention provides an identification circuit for redundant DC / DC half-bridge short circuit, wherein the DC / DC includes a high-voltage side battery, a low-voltage side battery, at least two energy conversion units, and a high-voltage side switch and a low-voltage side switch corresponding to each of the energy conversion units; each of the energy conversion units is connected to the high-voltage side battery via its corresponding high-voltage side switch and to the low-voltage side battery via its corresponding low-voltage side switch; the identification circuit includes an identification control subcircuit, and a control switch, a high-voltage side sampling device, and a low-voltage side sampling device corresponding to each of the energy conversion units; for each of the energy conversion units: the control switch connects the energy conversion unit and the low-voltage side switch; the high-voltage side sampling device The device is configured to collect high-side circuit information at both ends of the high-side switch; the low-side sampling device is configured to collect low-voltage circuit information at both ends of the low-voltage control subcircuit formed by the control switch and the low-voltage side switch; the input end of the identification control subcircuit is connected to the high-side sampling device and the low-voltage side sampling device of each energy conversion unit, and the output end of the identification control subcircuit is connected to the high-side switch, the control switch, and the low-voltage side switch of each energy conversion unit; the identification control subcircuit is configured to identify whether the energy conversion unit has a short-circuit fault based on the high-side circuit information and the low-voltage side circuit information of the energy conversion unit in a working state. With such a configuration, the redundant DC / DC half-bridge short-circuit identification circuit provided by the present invention can accurately identify short-circuit faults in redundant DC / DC fault paths, overcoming the defect in the prior art that when a half-bridge upper transistor short circuit occurs in one path (faulty path), the other paths (normal paths) will also report a fault, resulting in the DC / DC being unable to maintain normal path operation, thereby ensuring the single-path output function of the redundant DC / DC and improving product availability and safety. Furthermore, the circuit for identifying a redundant DC / DC half-bridge short circuit provided by the present invention does not require changing the circuit structure of the existing DC / DC and is easy to implement; furthermore, the circuit for identifying a redundant DC / DC half-bridge short circuit provided by the present invention has good robustness and does not impose any restrictions on the energy conversion unit in the redundant DC / DC. The energy conversion unit of the DC / DC can be single-phase or multi-phase.

[0062] Since the DC / DC, vehicle, method for identifying a redundant DC / DC half-bridge short circuit, and storage medium provided by the present invention belong to the same inventive concept as the method for identifying a redundant DC / DC half-bridge short circuit provided by the present invention, and therefore have at least the same beneficial effects, they are not described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 A schematic diagram of a DC / DC circuit with redundant energy conversion units in the prior art;

[0064] Figure 2 A schematic diagram of a redundant DC / DC half-bridge short-circuit identification circuit and a DC / DC circuit according to one embodiment of the present invention;

[0065] Figure 3 A schematic diagram of a circuit structure for identifying a redundant DC / DC half-bridge short circuit and a DC / DC circuit according to one embodiment of the present invention;

[0066] Figure 4 A schematic flow chart of a method for identifying a short circuit in a redundant DC / DC half-bridge provided in one embodiment of the present invention;

[0067] The description of the accompanying drawings is as follows:

[0068] 110 - high-voltage side battery, 120 - high-voltage side switch, 130 - energy conversion unit, 140 - low-voltage side switch, 150 - low-voltage side battery, 160 - load;

[0069] 200 - identification circuit, 210 - identification control subcircuit, 211 - sampling unit, 212 - protection unit, 213 - control unit, 214 - drive unit, 220 - control switch, 230 - high-voltage side sampling device, 231 - first voltage sampling element, 232 - second voltage sampling element, 233 - current sampling element, 240 - low-voltage side sampling device, 241 - third voltage sampling element, 242 - fourth voltage sampling element;

[0070] 300- low voltage side control subcircuit; DETAILED DESCRIPTION

[0071] To further clarify the objectives, advantages, and features of the present invention, the following, in conjunction with the accompanying drawings, further describes in detail the redundant DC / DC half-bridge short circuit identification circuit, DC / DC, vehicle, method, and medium provided by the present invention. It should be noted that the drawings are in a highly simplified form and are not to exact scale, and are intended solely to facilitate and clearly illustrate the purpose of the embodiments of the present invention. It should be understood that the drawings in this specification do not necessarily depict the specific structure of the present invention to scale, and that illustrative features used in the drawings to illustrate certain principles of the present invention may be slightly simplified. The specific design features of the present invention disclosed herein, including, for example, specific dimensions, orientations, positions, and shapes, will be determined in part by the specific intended application and use environment. Furthermore, in the embodiments described below, the same reference numerals may be used across different drawings to denote the same parts or parts having the same function, and their repeated descriptions may be omitted. In this specification, similar reference numerals and letters are used to denote similar items. Therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0072] Where appropriate, these terms used in this manner are interchangeable. Similarly, if a method described herein comprises a series of steps, the order in which the steps are presented herein is not necessarily the only order in which the steps may be performed, and some of the steps described may be omitted and / or other steps not described herein may be added to the method.

[0073] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0074] This embodiment provides a circuit for identifying a short circuit in a redundant DC / DC half-bridge. Figure 2 and Figure 3 ,in, Figure 2 A structural block diagram of a redundant DC / DC half-bridge short-circuit identification circuit and a DC / DC provided in this embodiment; Figure 3 A schematic diagram of a redundant DC / DC half-bridge short circuit identification circuit and a DC / DC circuit structure provided in one embodiment of the present invention. Figure 3 Take a two-way energy conversion unit as an example for explanation. Figure 2 As can be seen, the DC / DC includes a high-side battery 110, a low-voltage battery 150, N energy conversion units 130, and a high-side switch 120 and a low-voltage switch 140 corresponding to each energy conversion unit 130. Each energy conversion unit 130 is connected to the high-side battery 110 via its corresponding high-side switch 120 and to the low-voltage battery 150 via its corresponding low-voltage switch 140. The identification circuit 200 includes an identification control subcircuit 210, and a control switch 220, a high-side sampling device 230, and a low-voltage sampling device 240 corresponding to each energy conversion unit 130, where N ≥ 2. For each of the energy conversion units 130: the control switch 220 connects the energy conversion unit 130 and the low-voltage side switch 140; the high-voltage side sampling device 230 is configured to collect high-voltage side circuit information at both ends of the high-voltage side switch 120; the low-voltage side sampling device 240 is configured to collect low-voltage side circuit information at both ends of the low-voltage side control subcircuit 300 formed by the control switch 220 and the low-voltage side switch 140.

[0075] Specifically, the input end of the identification control subcircuit 210 is connected to the high-voltage side sampling device 230 and the low-voltage side sampling device 240 of each energy conversion unit 130, and the output end of the identification control subcircuit 210 is connected to the high-voltage side switch 120, the control switch 220 and the low-voltage side switch 140 of each energy conversion unit 130.

[0076] The identification control subcircuit 210 is configured to identify whether the energy conversion unit 130 has a short circuit fault based on the high-voltage side circuit information and the low-voltage side circuit information of the energy conversion unit 130 in a working state.

[0077] Thus configured, the redundant DC / DC half-bridge short-circuit identification circuit provided by the present invention can accurately identify short-circuit faults in the redundant DC / DC fault path. This overcomes the prior art defect that, when a short circuit occurs in the upper transistor of the half-bridge in one path (the faulty path), the other paths (the normal paths) will also report a fault, resulting in the DC / DC being unable to maintain normal operation. This ensures the single-path output function of the redundant DC / DC and improves product availability and safety. Furthermore, the redundant DC / DC half-bridge short-circuit identification circuit provided by the present invention does not require changes to the circuit structure of the existing DC / DC and is easy to implement. Furthermore, the redundant DC / DC half-bridge short-circuit identification circuit provided by the present invention has good robustness and does not impose any restrictions on the energy conversion unit in the redundant DC / DC. The energy conversion unit of the DC / DC can be single-phase or multi-phase.

[0078] Preferably, in one exemplary embodiment, the high-side sampling device 230 includes a first voltage sampling element 231, a second voltage sampling element 232, and a current sampling element 233. The first voltage sampling element 231 is disposed between the high-side battery 110 and the high-side switch 120; the second voltage sampling element 232 is disposed between the high-side switch 120 and the energy conversion unit 130; and the current sampling element 233 is disposed between the high-side switch 120 and the energy conversion unit 130b. Accordingly, the input end of the identification and control subcircuit 210 is connected to the high-side sampling device 230 of each energy conversion unit 130, including: the input end of the identification and control subcircuit 210 is connected to the first voltage sampling element 231, the second voltage sampling element 232, and the current sampling element 233.

[0079] Preferably, in one exemplary embodiment, the low-voltage side sampling device 240 includes a third voltage sampling element 241 and a fourth voltage sampling element 242. The third voltage sampling element 241 is disposed between the energy conversion unit 130 and the low-voltage side control subcircuit 300, and the fourth voltage sampling element 242 is disposed between the low-voltage side control subcircuit 300 and the low-voltage side battery 150.

[0080] Accordingly, the input end of the identification control subcircuit 210 is connected to the low-voltage side sampling device of each energy conversion unit 130 , including: the input end of the identification control subcircuit 210 is connected to the third voltage sampling element 241 and the fourth voltage sampling element 242 .

[0081] For ease of understanding and description, the following description uses a redundant DC / DC system having two energy conversion units, energy conversion units 130a and 130b, as an example. As those skilled in the art will appreciate, the present invention is not limited to a specific value of N for the energy conversion unit 130, and may be three, four, or the like.

[0082] See Figure 3 Taking the energy conversion unit 130a as an example, the corresponding high-side switch 120 is a first NMOS transistor 120a. The drain of the first NMOS transistor 120a is connected to the high-side battery, the source of the first NMOS transistor 120a is connected to the energy conversion unit 130a, and the gate of the first NMOS transistor 120a is connected to the output of the identification control subcircuit 210. As understood by those skilled in the art, the present invention does not limit the high-side switch 120 to an NMOS transistor. Most easily understood, the high-side switch 120 can also be a first PMOS transistor, and the corresponding source / drain connection relationship can be adaptively adjusted: that is, if the high-side switch 120 is a first PMOS transistor, the source of the first PMOS transistor is connected to the high-side battery, the drain of the first PMOS transistor is connected to the energy conversion unit 130, and the gate of the first PMOS transistor is connected to the input of the identification circuit 200.

[0083] Similar to the high-side switch 120, corresponding to the energy conversion unit 130a, the control switch 220 is a second NMOS tube 220a, and the low-voltage side switch 140 is a third NMOS tube 140a. The drain of the second NMOS tube 220a is connected to the energy conversion unit 130a, the drain of the second NMOS tube 220a is connected to the source of the third NMOS tube 140a, and the drain of the third NMOS tube 140a is connected to the low-voltage side battery 150.

[0084] Correspondingly, the output end of the identification control subcircuit 210 is connected to the low-voltage side switch and the control switch of each energy conversion unit 130, including: the output end of the identification control subcircuit 130 is connected to the gate of the second NMOS tube 220a and the gate of the third NMOS tube 140a.

[0085] As those skilled in the art will appreciate, similar to the high-side switch 120 being a first PMOS transistor, the control switch 220 can be a second PMOS transistor, and the low-side switch 150 can be a third PMOS transistor. For the corresponding connection relationships, please refer to the above description of the connection relationship when the high-side switch 120 is a first PMOS transistor. To avoid redundancy, we will not elaborate on each one here. Furthermore, the above description is merely a description of a preferred embodiment and does not limit the present invention. The high-side switch 120, the control switch 220, and the low-side switch 150 can also be other switch types.

[0086] Furthermore, the specific structures of the high-voltage side switch 120, the control switch 220 and the low-voltage side switch 140 corresponding to the other energy conversion unit 130b are similar to those of the energy conversion unit 130a and are not described in detail again. Figure 3 For ease of understanding, energy conversion unit 130b is configured to have a structure completely similar to energy conversion unit 130a, namely: the high-side switch 220 of energy conversion unit 130b is the first NMOS transistor 120b, the control switch 220 is the second NMOS transistor 220b, and the low-side switch 140 is the third NMOS transistor 140b. Obviously, this is not a limitation of the present invention. Each energy conversion unit 130 is independent of each other, and the high-side switch 120, control switch 220, and low-side switch 140 of each energy conversion unit 130 can be the same or different.

[0087] Preferably, in one exemplary embodiment, taking the energy conversion unit 130a as an example, the energy conversion unit 130a includes a first capacitor 131a, a fourth NMOS transistor 132a, a fifth NMOS transistor 133a, an inductor 134a, and a second capacitor 135a. One end of the first capacitor 131a, the drain of the fourth NMOS transistor 132a, and one end of the high-side switch 110 (i.e., the first NMOS transistor 120a) are commonly connected; the source of the fourth NMOS transistor 132a, the drain of the fifth NMOS transistor 133a, and one end of the inductor 134a are commonly connected; the other end of the inductor 134a, one end of the second capacitor 135a, and one end of the low-voltage side control subcircuit 300 are commonly connected; and the other end of the first capacitor 131a, the source of the fifth NMOS transistor 133a, and the other end of the second capacitor 135a are commonly connected to ground.

[0088] Similar to the first NMOS transistor 120a, the second NMOS transistor 220a, and the third NMOS transistor 140a, the fourth NMOS transistor 132a and the fifth NMOS transistor 135a can also be PMOS transistors, and the connection relationship between the source and the drain can be adaptively adjusted to the interface. To avoid redundancy, they will not be described one by one.

[0089] In addition, although the energy conversion unit 130a is used for illustration, the structure of the energy conversion unit 130b is similar. Figure 3 With the above description, those skilled in the art should be able to understand the circuit structure of the energy conversion unit 130b.

[0090] Please continue to see Figure 2 and Figure 3 In one exemplary embodiment, the identification control subcircuit 210 includes a sampling unit 211 , a protection unit 212 , a control unit 213 and a driving unit 214 .

[0091] Specifically, the input end of the sampling unit 211 is connected to the high-voltage side sampling device 230 and the low-voltage side sampling device 140 of each energy conversion unit 130, and the output end of the sampling unit 211 is connected to the input end of the protection unit 212; the input end of the control unit 213 is connected to the output end of the sampling unit 211 and the output end of the protection unit 212; the output end of the protection unit 212 and the output end of the control unit 213 are connected to the input end of the driving unit 214, and the output end of the driving unit 214 is connected to the low-voltage side switch 140, the control switch 220 and the high-voltage side switch 120. Preferably, in one embodiment, the sampling unit 211 includes N sub-sampling units corresponding to the energy conversion unit 130, such as Figure 3As shown, if the redundant DC / DC has two energy conversion units 130a and 130b, the sampling unit 211 includes two sub-sampling units 211a and 211b, wherein the sub-sampling unit 211a is used to obtain the high-voltage side circuit information and the low-voltage side circuit information, and the sub-sampling unit 211b is used to obtain the high-voltage side circuit information and the low-voltage side circuit information of the energy conversion unit 130b. Similarly, the protection unit 212 also includes N sub-protection units adapted to the energy conversion unit of the redundant DC / DC. Still taking the redundant DC / DC having two energy conversion units 130a and 130b as an example, the protection unit 212 includes two sub-protection units 212a and 212b, wherein the sub-protection unit 212a is used to drive the drive unit 214 to control the connection / disconnection state of the high-voltage side switch 120, the low-voltage side switch 140 and the control switch 220 of the energy conversion unit 130a; the sub-protection unit 212b is used to drive the drive unit 214 to control the connection / disconnection state of the high-voltage side switch 120, the low-voltage side switch 140 and the control switch 220 of the energy conversion unit 130b.

[0092] Accordingly, the identification control subcircuit 210 is configured to identify whether the energy conversion unit 130 has a short circuit fault based on the high-voltage side circuit information and the low-voltage side circuit information of the energy conversion unit 130 in the working state, including:

[0093] The sampling unit 211 is configured to send the high-voltage side circuit information and the low-voltage side circuit information to the protection unit 212 and the control unit 213;

[0094] The protection unit 212 is configured to determine whether a high-voltage side overcurrent fault or a low-voltage side overvoltage fault occurs based on the high-voltage side circuit information and the low-voltage side circuit information, and to send a determination result of the high-voltage side overcurrent fault or the low-voltage side overvoltage fault to the control unit 213;

[0095] The control unit 213 is configured to determine whether the energy conversion unit 130 has a short circuit fault according to the judgment result of the high-voltage side overcurrent fault or the low-voltage side overvoltage fault, the high-voltage side circuit information and the low-voltage side circuit information;

[0096] The protection unit 212 and the control unit 213 are further configured to drive the drive unit 214 to control the disconnection / connection states of the high-voltage side switch 120 , the low-voltage side switch 150 , and the control switch 220 .

[0097] With this configuration, the present invention provides a redundant DC / DC half-bridge short-circuit identification circuit. When a short circuit occurs in an upper transistor of a DC / DC energy conversion unit 130, sampling unit 211 constantly monitors high-side currents A1a and A1b and low-side voltages V3a and V3b, respectively, in response to a high-side overcurrent or low-side overvoltage fault in the faulty circuit, or an overvoltage or overcurrent fault in the normal circuit. When the current or voltage exceeds a threshold, sub-protection unit 212a in protection unit 212 triggers shutdown of the corresponding first NMOS transistor 120a, second NMOS transistor 220a, and third NMOS transistor 140a, or sub-protection unit 212b triggers shutdown of the corresponding first NMOS transistor 120b, second NMOS transistor 220b, and third NMOS transistor 140b. Because the upper transistor is short-circuited, the high and low voltages are directly connected, and when the lower transistor is turned on, the half-bridge is also in a direct-connection state. Therefore, V2 in the faulty circuit decreases, V3 increases, and the normal voltage remains unchanged or decreases very slowly. Therefore, the redundant DC / DC half-bridge short-circuit identification circuit provided by the present invention can accurately identify a short-circuit fault in a redundant DC / DC fault path based on the high-voltage side circuit information and the low-voltage side circuit information of the energy conversion unit in operation. This overcomes the defect in the prior art that, when a short circuit occurs in a half-bridge upper transistor in one path (the faulty path), other paths (normal paths) will also report a fault, causing the DC / DC to be unable to maintain normal path operation. This ensures the single-path output function of the redundant DC / DC and improves product availability and safety.

[0098] Based on the same inventive concept, another embodiment of the present invention provides a DC / DC, wherein the DC / DC includes any one of the above-mentioned circuits for identifying a short circuit of a redundant DC / DC half-bridge.

[0099] Based on the same inventive concept, another embodiment of the present invention further provides a vehicle, which includes the above-mentioned DC / DC.

[0100] The DC / DC and vehicle embodiments are described briefly, as their fundamental principles are similar to those of the redundant DC / DC on-bridge short-circuit identification circuit. For related details, please refer to the description of the method embodiment. Furthermore, since the DC / DC and vehicle provided in the aforementioned embodiments share the same inventive concept as the redundant DC / DC on-bridge short-circuit identification circuit, they share at least the same beneficial relevance and will not be further elaborated upon here.

[0101] Another embodiment of the present invention provides a method for identifying a redundant DC / DC half-bridge short circuit, based on the circuit for identifying a redundant DC / DC half-bridge short circuit described in any of the above embodiments. Figure 3 and Figure 4 ,in Figure 4A schematic flow chart of a method for identifying a short circuit in a redundant DC / DC half-bridge according to an embodiment of the present invention. Figure 4 It can be seen that the identification method includes:

[0102] S1: For each of the energy conversion units, identifying whether the energy conversion unit has a short circuit fault based on the collected high-voltage side circuit information and low-voltage side circuit information of the energy conversion unit.

[0103] Specifically, in one exemplary embodiment, see Figure 3 , taking the energy conversion unit 130a as an example for explanation. The high-voltage side circuit information includes a high-voltage side current value A1a, a first voltage value V1, and a second voltage value V2a. The first voltage value V1 is the voltage value of one end of the high-voltage side switch 120 (first NMOS transistor 120a) connected to the high-voltage side battery 110, and the second voltage value V2a is the voltage value of the other end of the high-voltage side switch 120. The low-voltage side circuit information includes a third voltage value V3a and a fourth voltage value V4. The third voltage value is the voltage value of one end of the low-voltage side control subcircuit 300 connected to the energy conversion unit 130a, and the fourth voltage value V4 is the voltage value of the other end of the low-voltage side control subcircuit 130.

[0104] Preferably, the identifying whether the energy conversion unit 130a has a short circuit fault based on the collected high-voltage side circuit information and low-voltage side circuit information of the energy conversion unit 130a includes:

[0105] S11: Determine whether it is a low-voltage side overvoltage fault or a high-voltage side overcurrent fault. If so, execute step 12; if not, the energy conversion unit 130a does not have a short-circuit fault; wherein, the method for determining the high-voltage side overcurrent fault includes the high-voltage side current value A1a exceeding the first threshold; the method for determining the low-voltage side overvoltage fault includes the third voltage value V3a exceeding the second threshold.

[0106] S12: If it is a low-voltage side overvoltage fault, then based on the first voltage value V1, the second voltage V2a, the third voltage value V3a, the fourth voltage value V4, the third threshold value and the fourth threshold value, a first judgment strategy is adopted to determine whether the energy conversion unit 130a has a short-circuit fault; if it is a high-voltage side overcurrent fault, execute step S13.

[0107] Specifically, in one preferred embodiment, the first judgment strategy is used to judge whether the energy conversion unit 130a has a short circuit fault, including:

[0108] It is determined whether the third voltage value V3a>(the fourth voltage value V4+the third threshold) and the second voltage value V2a<(the first voltage value V1-the fourth threshold) are established. If so, the upper tube (the fourth NMOS tube 132a / the fourth PMOS tube) of the energy conversion unit 130a has a short circuit fault; if not, the overvoltage fault is caused by a control abnormality.

[0109] S13: Based on the first voltage value V1, the second voltage value V1a, the third voltage value V3a, the fourth voltage value V4, the third threshold value, the fourth threshold value and the fifth threshold value, a second judgment strategy is adopted to judge whether the upper tube of the energy conversion unit 130a has a short circuit fault.

[0110] Among them, the third threshold, the fourth threshold and the fifth threshold are preset values. The present invention does not limit the specific values ​​of the third threshold, the fourth threshold and the fifth threshold. In practical applications, they should be reasonably set according to actual needs.

[0111] Preferably, in one exemplary embodiment, the second judgment strategy is used to judge whether the upper tube of the energy conversion unit has a short circuit fault, including:

[0112] Determine whether the second voltage value V2a is less than (the first voltage value V1 - the fifth threshold value). If so, the first capacitor 131a of the energy conversion unit 130a has a short circuit fault. If not, determine whether the third voltage value V3a is greater than (the fourth voltage value V4 + the third threshold value) and the second voltage value V2a is less than (the first voltage value - the fourth threshold value). If so, the upper transistor (fourth NMOS transistor / fourth PMOS transistor) of the energy conversion unit has a short circuit fault. If not, the overcurrent fault is caused by a control abnormality. It should be noted that, as a preference, the fifth threshold value is greater than the fourth threshold value.

[0113] Preferably, the method for identifying a redundant DC / DC half-bridge short circuit further includes:

[0114] S2: If a short circuit fault occurs in the energy conversion unit 130a, the first NMOS tube 120a (the high-voltage side switch), the second NMOS tube 220a (the control switch) and the third NMOS tube 140a (the low-voltage side switch) of the energy conversion unit 130a are controlled to be in the disconnected state; the high-voltage side switch, the control switch and the low-voltage side switch of other non-faulty energy conversion units 130b are controlled to be in the connected state.

[0115] Otherwise, the high-voltage side switch, the control switch, and the low-voltage side switch of the energy conversion unit 130a are controlled to be in a connected state.

[0116] Specifically, see Figure 3 If it is determined that the upper transistor of the energy conversion unit 130a is short-circuited or the first capacitor 131a is short-circuited, the control unit 213 always keeps the first NMOS transistor 120a, the second NMOS transistor 220a, the third NMOS transistor 140a, and the energy conversion unit 130a in the on state, and controls the first NMOS transistor 120b, the second NMOS transistor 220b, and the third NMOS transistor 140b to be off, and the energy conversion unit 130b continues to operate. If the fault is an overvoltage or overcurrent fault caused by an abnormality, the control unit 213 controls the first NMOS transistor 120a, the second NMOS transistor 220a, the third NMOS transistor 140a, and the energy conversion unit 130a to be off, and the energy conversion unit 130b continues to operate (optional), and controls the first NMOS transistor 120b, the second NMOS transistor 220b, and the third NMOS transistor 140b to be off, and the energy conversion unit 130b continues to operate.

[0117] Similarly, the method for identifying a short circuit of the upper tube of the energy conversion unit 130 b is consistent with the above process and will not be repeated herein.

[0118] With such a configuration, the method for identifying a redundant DC / DC half-bridge short circuit provided by the present invention has a simple process control and is easy to implement. Furthermore, since the method for identifying a redundant DC / DC half-bridge short circuit provided by the present invention and the circuit for identifying a redundant DC / DC half-bridge short circuit provided by the present invention are based on the same inventive concept, they also have at least the same beneficial effects as the circuit, and therefore are not further described herein.

[0119] It should be noted that the systems and methods disclosed in the embodiments of this document may also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of the devices, methods, and computer program products according to the various embodiments of this document. In this regard, each box in the flowchart or block diagram may represent a module, program, or portion of code, wherein the module, program segment, or portion of code contains one or more executable instructions for implementing a specified logical function, and the module, program segment, or portion of code contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the boxes may also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes may actually be executed substantially in parallel, or they may sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart, may be implemented by a dedicated hardware-based system for performing the specified function or action, or may be implemented by a combination of dedicated hardware and computer instructions.

[0120] In addition, the functional modules in the various embodiments of this document may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0121] Yet another embodiment of the present invention provides a computer-readable storage medium having a computer program stored therein. When the computer program is executed by a processor, the steps of the above-mentioned method for identifying a redundant DC / DC half-bridge short circuit can be implemented.

[0122] The readable storage medium of the embodiment of the present invention can adopt any combination of one or more computer-readable media. The readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, but not limited to, a system, device or component of electricity, magnetism, light, electromagnetic, infrared or semiconductor, or any combination thereof. More specific examples (non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer hard disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this article, a computer-readable storage medium can be any tangible medium containing or storing a program, which can be used by an instruction execution system, device or device or used in combination with it.

[0123] A computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, which carries computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can transmit, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0124] It should be noted that the computer program code for performing the operations of the present invention can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0125] The redundant DC / DC half-bridge short-circuit identification circuit provided by the present invention can accurately identify short-circuit faults in the redundant DC / DC fault path. This overcomes the prior art defect that, when a short circuit occurs in a half-bridge upper transistor in one path (the faulty path), the other paths (the normal paths) will also report a fault, resulting in the DC / DC being unable to maintain normal operation. This ensures the single-path output function of the redundant DC / DC and improves product availability and safety. Furthermore, the redundant DC / DC half-bridge short-circuit identification circuit provided by the present invention does not require changes to the circuit structure of the existing DC / DC and is easy to implement. Furthermore, the redundant DC / DC half-bridge short-circuit identification circuit provided by the present invention has good robustness and does not impose any restrictions on the energy conversion unit in the redundant DC / DC. The energy conversion unit of the DC / DC can be single-phase or multi-phase.

[0126] Since the DC / DC, vehicle, method for identifying a redundant DC / DC half-bridge short circuit, and storage medium provided by the present invention belong to the same inventive concept as the method for identifying a redundant DC / DC half-bridge short circuit provided by the present invention, and therefore have at least the same beneficial effects, they are not described in detail here.

[0127] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean 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 present invention. 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 can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0128] In summary, the above embodiments provide detailed descriptions of different configurations of the redundant DC / DC half-bridge short circuit identification circuit, DC / DC, vehicle, method, and medium proposed in the present invention. Of course, the above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention. The present invention includes but is not limited to the configurations listed in the above embodiments. Those skilled in the art can draw inferences based on the contents of the above embodiments. Any changes and modifications made by those skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A circuit for identifying a short circuit in a redundant DC / DC half-bridge, characterized in that: The DC / DC includes a high-voltage side battery, a low-voltage side battery, at least two energy conversion units, and a high-voltage side switch and a low-voltage side switch corresponding to each energy conversion unit; each energy conversion unit is connected to the high-voltage side battery through its corresponding high-voltage side switch and connected to the low-voltage side battery through its corresponding low-voltage side switch; The identification circuit includes an identification control subcircuit, and a control switch, a high-voltage side sampling device and a low-voltage side sampling device corresponding to each of the energy conversion units; For each of the energy conversion units: the control switch connects the energy conversion unit and the low-voltage side switch; the high-voltage side sampling device is configured to collect high-voltage side circuit information at both ends of the high-voltage side switch; the low-voltage side sampling device is configured to collect low-voltage side circuit information at both ends of the low-voltage side control subcircuit formed by the control switch and the low-voltage side switch; The input end of the identification control subcircuit is connected to the high-voltage side sampling device and the low-voltage side sampling device of each energy conversion unit, and the output end of the identification control subcircuit is connected to the high-voltage side switch, the control switch and the low-voltage side switch of each energy conversion unit; The identification control subcircuit is configured to identify whether the energy conversion unit has a short circuit fault based on the high-voltage side circuit information and the low-voltage side circuit information of the energy conversion unit in a working state; The high-voltage side sampling device includes a first voltage sampling element, a second voltage sampling element, and a current sampling element; wherein the first voltage sampling element is arranged between the high-voltage side battery and the high-voltage side switch; the second voltage sampling element is arranged between the high-voltage side switch and the energy conversion unit, and the current sampling element is arranged between the high-voltage side switch and the energy conversion unit; the low-voltage side sampling device includes a third voltage sampling element and a fourth voltage sampling element; wherein the third voltage sampling element is arranged between the energy conversion unit and the low-voltage side control subcircuit, and the fourth voltage sampling element is arranged between the low-voltage side control subcircuit and the low-voltage side battery.

2. The redundant DC / DC half-bridge short circuit identification circuit according to claim 1, characterized in that: The input end of the identification control subcircuit is connected to the high-voltage side sampling device of each energy conversion unit, including: An input end of the identification control subcircuit is connected to the first voltage sampling element, the second voltage sampling element, and the current sampling element.

3. The redundant DC / DC half-bridge short circuit identification circuit according to claim 1, characterized in that: The input end of the identification control subcircuit is connected to the low-voltage side sampling device of each energy conversion unit, including: An input terminal of the identification control subcircuit is connected to the third voltage sampling element and the fourth voltage sampling element.

4. The redundant DC / DC half-bridge short circuit identification circuit according to claim 1, characterized in that: The high-side switch is a first NMOS transistor / first PMOS transistor, the drain / source of the first NMOS transistor / first PMOS transistor is connected to the high-side battery, the source / drain of the first NMOS transistor / first PMOS transistor is connected to the energy conversion unit, and the gate of the first NMOS transistor / first PMOS transistor is connected to the output end of the identification control subcircuit; and / or The control switch is a second NMOS tube / a second PMOS tube, the low-voltage side switch is a third NMOS tube / a third PMOS tube, the drain / source of the second NMOS tube / the second PMOS tube is connected to the energy conversion unit, the source / drain of the second NMOS tube / the second PMOS tube is connected to the source / drain of the third NMOS tube / the third PMOS tube, and the drain / source of the third NMOS tube / the third PMOS tube is connected to the low-voltage side battery; The output end of the identification control subcircuit is connected to the low-voltage side switch and the control switch of each energy conversion unit, including: The output end of the identification control subcircuit is connected to the gate / gate of the second NMOS transistor / the second PMOS transistor and the gate / gate of the third NMOS transistor / the third PMOS transistor.

5. The redundant DC / DC half-bridge short circuit identification circuit according to claim 1, characterized in that: The energy conversion unit includes a first capacitor, a fourth NMOS transistor / a fourth PMOS transistor, a fifth NMOS transistor / a fifth PMOS transistor, an inductor, and a second capacitor; One end of the first capacitor, the drain / source of the fourth NMOS transistor / fourth PMOS transistor, and one end of the high-side switch are commonly connected; The source / drain of the fourth NMOS transistor / fourth PMOS transistor, the drain / source of the fifth NMOS transistor / fifth PMOS transistor, and one end of the inductor are connected in common; The other end of the inductor, one end of the second capacitor and one end of the low-voltage side control sub-circuit are connected in common; The other end of the first capacitor, the source / drain of the fifth NMOS transistor / fifth PMOS transistor, and the other end of the second capacitor are connected to the ground.

6. The redundant DC / DC half-bridge short circuit identification circuit according to claim 1, characterized in that: The identification control subcircuit includes a sampling unit, a protection unit, a control unit and a driving unit; The input end of the sampling unit is connected to the high-voltage side sampling device and the low-voltage side sampling device of each energy conversion unit, and the output end of the sampling unit is connected to the input end of the protection unit; the input end of the control unit is connected to the output end of the sampling unit and the output end of the protection unit; the output end of the protection unit and the output end of the control unit are connected to the input end of the driving unit, and the output end of the driving unit is connected to the low-voltage side switch, the control switch and the high-voltage side switch; The sampling unit is configured to send the high-voltage side circuit information and the low-voltage side circuit information to the protection unit and the control unit; The protection unit is configured to determine whether a high-voltage side overcurrent fault or a low-voltage side overvoltage fault occurs based on the high-voltage side circuit information and the low-voltage side circuit information, and to send a determination result of the high-voltage side overcurrent fault or the low-voltage side overvoltage fault to the control unit; The control unit is configured to determine whether the energy conversion unit has a short circuit fault according to the judgment result of the high-voltage side overcurrent fault or the low-voltage side overvoltage fault, and the high-voltage side circuit information and the low-voltage side circuit information; The protection unit and the control unit are further configured to drive the drive unit to control the disconnection / connection states of the high-voltage side switch, the low-voltage side switch, and the control switch.

7. A DC / DC, characterized in that: The invention comprises the identification circuit for redundant DC / DC half-bridge short circuit according to any one of claims 1 to 6.

8. A vehicle, characterized in that: Comprising the DC / DC as claimed in claim 7.

9. A method for identifying a redundant DC / DC half-bridge short circuit, characterized in that: Based on the identification circuit for redundant DC / DC half-bridge short circuit according to any one of claims 1 to 6, the identification method includes: for each of the energy conversion units, based on the collected high-voltage side circuit information and low-voltage side circuit information of the energy conversion unit, identifying whether the energy conversion unit has a short circuit fault.

10. The method for identifying a redundant DC / DC half-bridge short circuit according to claim 9, characterized in that: The high-voltage side circuit information includes a high-voltage side current value, a first voltage value, and a second voltage value, wherein the first voltage value is the voltage value of one end of the high-voltage side switch connected to the high-voltage side battery, and the second voltage value is the voltage value of the other end of the high-voltage side switch; The low-voltage side circuit information includes a third voltage value and a fourth voltage value, the third voltage value is the voltage value of one end of the low-voltage side control subcircuit connected to the energy conversion unit, and the fourth voltage value is the voltage value of the other end of the low-voltage side control subcircuit; The step of identifying whether the energy conversion unit has a short circuit fault based on the collected high-voltage side circuit information and low-voltage side circuit information of the energy conversion unit includes: S11: Determine whether it is a low-voltage side overvoltage fault or a high-voltage side overcurrent fault. If so, execute step S12; if not, the energy conversion unit does not have a short-circuit fault; wherein the method for determining the high-voltage side overcurrent fault includes the high-voltage side current value exceeding a first threshold; the method for determining the low-voltage side overvoltage fault includes the third voltage value exceeding a second threshold; S12: If the fault is an overvoltage fault on the low-voltage side, determine whether the energy conversion unit has a short-circuit fault using a first judgment strategy based on the first voltage value, the second voltage value, the third voltage value, the fourth voltage value, the third threshold value, and the fourth threshold value; If it is a high-voltage side overcurrent fault, execute step S13; S13: Based on the first voltage value, the second voltage value, the third voltage value, the fourth voltage value, the third threshold value, the fourth threshold value and the fifth threshold value, a second judgment strategy is adopted to judge whether the upper tube of the energy conversion unit has a short circuit fault.

11. The method for identifying a redundant DC / DC half-bridge short circuit according to claim 10, characterized in that: The energy conversion unit includes a first capacitor, a fourth NMOS transistor / PMOS transistor, a fifth NMOS transistor / PMOS transistor, an inductor, and a second capacitor; One end of the first capacitor, the drain / source of the fourth NMOS transistor / PMOS transistor, and one end of the high-side switch are connected in common; The source / drain of the fourth NMOS / PMOS transistor, the drain / source of the fifth NMOS / PMOS transistor, and one end of the inductor are connected in common; The other end of the inductor, one end of the second capacitor and one end of the low-voltage side control sub-circuit are connected in common; The other end of the first capacitor, the source / drain of the fifth NMOS transistor / PMOS transistor and the other end of the second capacitor are connected to the ground; In step S12, the first judgment strategy is used to judge whether the energy conversion unit has a short circuit fault based on the first voltage value, the second voltage value, the third voltage value, the fourth voltage value, the third threshold value, and the fourth threshold value, including: Determine whether the third voltage value is greater than (the fourth voltage value + the third threshold value) and the second voltage value is less than (the first voltage value - the fourth threshold value). If so, a short circuit fault exists in the fourth NMOS transistor / PMOS transistor of the energy conversion unit; if not, the overvoltage fault is caused by a control abnormality.

12. The method for identifying a redundant DC / DC half-bridge short circuit according to claim 11, characterized in that: In step S13, the second judgment strategy is used to judge whether the upper tube of the energy conversion unit has a short circuit fault based on the first voltage value, the second voltage value, the third voltage value, the fourth voltage value, the third threshold value, the fourth threshold value, and the fifth threshold value, including: Determine whether the second voltage value is less than (the first voltage value - the fifth threshold value). If so, the first capacitor of the energy conversion unit has a short circuit fault. If not, determine whether the third voltage value is greater than (the fourth voltage value + the third threshold value) and the second voltage value is less than (the first voltage value - the fourth threshold value). If so, the fourth NMOS tube / PMOS tube of the energy conversion unit has a short circuit fault. If not, the overcurrent fault is caused by control abnormality.

13. The method for identifying a redundant DC / DC half-bridge short circuit according to claim 10, wherein: Also includes: If a short circuit fault occurs in the energy conversion unit, the high-voltage side switch, the control switch, and the low-voltage side switch of the energy conversion unit are controlled to be in a disconnected state; and the high-voltage side switch, the control switch, and the low-voltage side switch of other non-faulty energy conversion units are controlled to be in a connected state; Otherwise, the high-voltage side switch, the control switch, and the low-voltage side switch of the energy conversion unit are controlled to be in a connected state.

14. A computer-readable storage medium, characterized in that The readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for identifying a redundant DC / DC half-bridge short circuit according to any one of claims 9 to 13 is implemented.

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