A test load box

Abstract

The present application relates to the field of ECU testing technology, and provides a test load box. The test load box includes a first power interface, a second power interface, an input transformer module, a power supply load module, a control switch, a circuit breaker, a first diode, a second diode, and a test load module. Both an external AC power supply and an external DC power supply can make the load box of this embodiment work; the on-off state of the control switch in this application can control the power supply signal output by the power supply load module and the test load module, which can be used for functional debugging of the module to be tested during the development process when the control switch is closed, and can also be used for electrical testing by controlling the input signal of the second power interface when the control switch is disconnected; the test load module and the power supply load module of this application can provide various types of test signals, which can be adapted to the development of ECUs with various functions, thereby greatly saving testing costs and shortening the development cycle.

Description

Technical Field

[0001] The present application relates to the technical field of ECU testing, and in particular to a test load box. Background Art

[0002] The development of ECU (Electronic Control Unit) cannot avoid the testing process. One of the indispensable elements of the testing process is the load box, which plays a very important role in the testing process. The main functions of the load box include: powering the DUT (Design under Test); providing the required signals for the DUT, including but not limited to 12V level signals, 5V level signals, 12V PWM signals, 5V PWM signals, pull-up sources and loads, pull-down sources and loads, inductive loads, etc.; providing a fault injection interface for the DUT, for example, the waveform used in the electrical test needs to be injected into the DUT, and the load box provides the fault injection interface.

[0003] The load boxes currently used in the market are usually test load boxes designed specifically according to the functions of the ECU to be tested. The load boxes are generally AC powered, and there is an AC to DC module inside the load box to convert the AC power into the DC power required by the ECU. This type of load box has the following defects: it cannot be powered by external DC power and will not work without AC power; it cannot be used for electrical testing and cannot provide a fault injection interface for the DUT; the load box function is highly coupled with the ECU function. After the current ECU is developed, the load box will fail and cannot be used in the development of other ECUs with different functions, resulting in a waste of resources and inefficient development work.

[0004] Therefore, how to provide a solution to the above technical problems is a problem that those skilled in the art need to solve. Summary of the invention

[0005] In view of this, an embodiment of the present application provides a test load box to solve the problem in the prior art that the test load box is highly coupled with the ECU function and cannot be reused.

[0006] In a first aspect of an embodiment of the present application, a test load box is provided, including a first power interface, a second power interface, an input transformer module, a power supply load module, a control switch, a circuit breaker, a first diode, a second diode, and a test load module, wherein:

[0007] The first power interface is used to connect to an external AC power source;

[0008] The input end of the input transformer module is connected to the first power interface, and the positive output end of the input transformer module is connected to the positive input end of the power supply load module;

[0009] The positive power interface and the negative power interface of the second power interface are used to connect the positive electrode and the negative electrode of the external DC power supply respectively;

[0010] The negative output terminal of the input transformer module is respectively connected to the negative input terminal of the power supply load module, the negative power interface of the second power interface, and the ground terminal;

[0011] The positive input terminal of the input transformer module is also connected to the positive electrode of the first diode and the first end of the normally open contact of the circuit breaker;

[0012] The positive power interface of the second power interface is also connected to the positive electrode of the second diode, the second end of the normally open contact, and the positive input end of the test load module;

[0013] The cathode of the first diode is connected to the cathode of the second diode and the first end of the coil of the circuit breaker respectively;

[0014] The first end of the control switch is connected to the second end of the coil, and the second end of the control switch is connected to the ground end;

[0015] The input transformer module is used to convert AC voltage into DC voltage;

[0016] The test load module includes a plurality of test channels, each of which is used to provide a first power supply signal corresponding to an external DC power supply or an input transformer module to the module under test;

[0017] The power supply load module includes a plurality of power supply load channels, each of which is used to provide the module to be tested with a second power supply signal or a load signal corresponding to the current power supply load channel.

[0018] Compared with the prior art, the beneficial effects of the embodiments of the present application include at least the following: the embodiments of the present application realize AC / DC conversion when connected to an external AC power supply through a first power supply interface and an input transformer module, and based on the connection relationship between the first power supply interface, the second power supply interface, the input transformer module, the first diode and the second diode, both the external AC power supply and the external DC power supply can make the load box of this embodiment work; based on the connection relationship between the control switch and the peripheral components, the power supply signal output by the power supply load module and the test load module can be controlled by the on-off state of the control switch, which can be used for functional debugging of the module to be tested during the development process when the control switch is closed, and can also be used for electrical testing by controlling the input signal of the second power supply interface when the control switch is disconnected; the test load module and the power supply load module of this scheme can provide various types of test signals, which can be adapted to the development of ECUs with various functions, thereby greatly saving testing costs and shortening the development cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 is a circuit structure diagram of a test load box according to an embodiment of the present application;

[0021] Figure 2 It is a partial circuit structure diagram of a test load box provided in an embodiment of the present application;

[0022] Figure 3 It is a partial circuit structure diagram of another test load box provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0024] A test load box according to an embodiment of the present application will be described in detail below with reference to the accompanying drawings.

[0025] Figure 1 1 is a circuit diagram of a test load box provided in an embodiment of the present application. Figure 1 As shown, the test load box includes a first power interface VIN1, a second power interface VIN2, an input transformer module V1, a power supply load module M1, a control switch SW0, a circuit breaker relay1, a first diode D1, a second diode D2, and a test load module M2, wherein:

[0026] The first power interface VIN1 is used to connect to an external AC power source;

[0027] The input end of the input transformer module V1 is connected to the first power interface VIN1, and the positive output end of the input transformer module V1 is connected to the positive input end of the power supply load module M1;

[0028] The positive power interface and the negative power interface of the second power interface VIN2 are used to connect the positive electrode and the negative electrode of the external DC power supply respectively;

[0029] The negative output terminal of the input transformer module V1 is respectively connected to the negative input terminal of the power supply load module M1, the negative power interface of the second power interface VIN2, and the ground terminal;

[0030] The positive input terminal of the input transformer module V1 is also connected to the positive electrode of the first diode D1 and the first end of the normally open contact K1 of the circuit breaker relay1;

[0031] The positive power interface of the second power interface VIN2 is also connected to the positive electrode of the second diode D2, the second end of the normally open contact K1, and the positive input end of the test load module M2;

[0032] The cathode of the first diode D1 is connected to the cathode of the second diode D2 and the first end of the coil of the circuit breaker relay1 respectively;

[0033] A first end of the control switch SW0 is connected to the second end of the coil, and a second end of the control switch SW0 is connected to the ground end;

[0034] The input transformer module V1 is used to convert AC voltage into DC voltage;

[0035] The test load module M2 includes a plurality of test channels, each of which is used to provide a first power supply signal corresponding to an external DC power supply or an input transformer module V1 to the module under test;

[0036] The power supply load module M1 includes a plurality of power supply load channels, each of which is used to provide a second power supply signal or a load signal corresponding to the current power supply load channel to the module to be tested.

[0037] It can be understood that in this embodiment, the input transformer module V1 is used to convert AC voltage into DC voltage. Therefore, when the first power interface VIN1 is connected to an external AC power source, the input transformer module V1 will receive the external AC power source through the first power interface VIN1 and perform AC-to-DC voltage conversion, and then the input transformer module V1 will output a stable DC voltage. Specifically, the external AC power source is usually an AC voltage of 220V / 380V, and the DC voltage output by the input transformer module V1 is usually in the range of 9V-16V. The output voltage of the input transformer module V1 is adjustable, that is, the working parameters of the input transformer module V1 can be adjusted according to user needs, thereby adjusting the specific value of the output voltage of the input transformer module V1.

[0038] It can be understood that the second power interface VIN2 is used to connect an external DC power supply. Since the DC power supply has a necessary positive and negative distinction, the positive power interface of the second power interface VIN2 is used to connect the positive pole of the external DC power supply, and the negative power interface of the second power interface VIN2 is used to connect the negative pole of the external DC power supply.

[0039] It can be understood that, for the power supply load module M1, the two input terminals of the power supply load module M1 are directly connected to the two output terminals of the input transformer module V1. When the first power supply interface VIN1 is connected to an external AC power supply, the external AC power supply can power the power supply load module M1; the positive input terminal of the power supply load module M1 is connected to the positive power supply interface of the second power supply interface VIN2 through the normally open contact K1 of the circuit breaker relay1, and the negative input terminal of the power supply grouping module M1 is directly connected to the negative power supply interface of the second power supply interface VIN2. When the second power supply interface VIN2 is connected to an external DC power supply and the normally open contact K1 is closed, the external DC power supply can power the power supply load module M1.

[0040] Similarly, for the test load module M2, the negative input terminal of the test load module M2 is connected to the ground terminal by default, and the positive input terminal of the test load module M2 is connected to the positive power interface of the second power interface VIN2. When the second power interface VIN2 is connected to an external DC power supply or a related test signal, the test load module M2 can receive the external DC power supply or the test signal; further, the positive input terminal of the test load module M2 is also connected to the second end of the normally open contact K1. When the normally open contact K1 is in a closed state, the positive input terminal of the test load module M2 is connected to the positive input terminal of the power supply load module M1. At this time, the input of the test load module M2 is the same as the input of the power supply load module M1, and reference can be made to the analysis above.

[0041] Furthermore, the input of the test load module M2 and the input of the power supply load module M1 are directly related to whether the first power interface VIN1 is connected to an external AC power supply and whether the second power interface VIN2 is connected to an external DC power supply, and are also directly related to the normally open contact K1 of the circuit breaker relay1. In this embodiment, the state change of the normally open contact K1 is determined by the control switch SW0. Specifically, based on the connection relationship between the control switch SW0, the circuit breaker relay1, the first diode D1, and the second diode D2 in the test load box of this embodiment, there are the following situations:

[0042] When the control switch SW0 is closed, if the first power interface VIN1 is connected to an external AC power supply, the input transformer module V1 converts the external AC power supply into DC and outputs a stable DC voltage. A path is formed from the positive output end of the input transformer module V1 through the first diode D1, the coil of the circuit breaker relay1, and the control switch SW0 to the ground end, so that current flows through the coil, the normally open contact K1 is closed, and the input transformer module V1 supplies power to the test load module M2 and the power supply load module M1 at the same time.

[0043] When the control switch SW0 is closed, if the second power interface VIN2 is connected to an external DC power supply, a path is formed from the positive power interface of the second power interface VIN2 through the second diode D2, the coil of the circuit breaker relay1, and the control switch SW0 to the ground terminal, so that current flows through the coil, the normally open contact K1 is closed, and the external DC power supply simultaneously supplies power to the test load module M2 and the power supply load module M1.

[0044] It can be seen that when the control switch SW0 is closed, as long as one of the first power interface VIN1 or the second power interface VIN2 is connected to an external power source, the input of the power supply load module M1 and the test load module M2 is the same and is the only external power source connected. It can be understood that in order to ensure that the level is not disturbed and there is no interference between the power sources, when the control switch SW0 is closed, only one of the first power interface VIN1 and the second power interface VIN2 is connected to an external power source at the same time.

[0045] When the control switch SW0 is disconnected, if the first power interface VIN1 is connected to an external AC power supply, the input transformer module V1 converts the external AC power supply into a stable DC voltage. As the control switch SW0 is disconnected, the path from the positive output end of the input transformer module V1 to the ground end through the first diode D1, the coil of the circuit breaker relay1, and the control switch SW0 is disconnected, so that no current flows through the coil, and the normally open contact K1 is in a disconnected state. The input transformer module V1 only supplies power to the power supply load module M1, and the input transformer module V1 no longer acts on the test load module M2.

[0046] When the control switch SW0 is disconnected, if the second power interface VIN2 is connected to an external DC power supply, as the control switch SW0 is disconnected, the path from the positive power interface of the second power interface VIN2 through the second diode D2, the coil of the circuit breaker relay1, and the control switch SW0 to the ground terminal is disconnected, so that no current flows through the coil, the normally open contact K1 is in a disconnected state, and the external DC power supply only supplies power to the test load module M2, and the external DC power supply no longer acts on the power supply load module M1.

[0047] It can be seen that when the control switch SW0 is disconnected, the input of the power supply load module M1 is determined by whether the first power supply interface VIN1 is connected to an external AC power supply, and the input of the test load module M2 is determined by whether the second power supply interface VIN2 is connected to an external DC power supply, and the power supply load module M1 and the test load module M2 are decoupled.

[0048] The first diode D1 and the second diode D2 are used to prevent the current from flowing in the reverse direction. Specifically, the first diode D1 is used to prevent the external DC power supply from flowing from the positive power supply interface of the second power supply interface VIN2 to the input transformer module V1, and the second diode D2 is used to prevent the current flowing out of the input transformer module V2 from flowing to the positive power supply interface of the second power supply interface VIN2. The first diode D1 and the second diode D2 are arranged so that when the control switch SW0 is disconnected, there is no interference between the external AC power supply and the external DC power supply, ensuring that the two power supplies respectively control the power supply load module M1 and the test load module M2.

[0049] As analyzed above, when the control switch SW0 is closed, an external power supply serves as the input of the power supply load module M1 and the test load module M2 at the same time. At this time, the test load box is in the power supply mode, and the external power supply is an external AC power supply or an external DC power supply for conventional power supply; when the control switch SW0 is disconnected, the power supply load module M1 is powered by the external AC power supply, and the test load module M2 is input by the external DC power supply. At this time, the test load box is in the test mode, the external AC power supply is still a conventional power supply, and the external DC power supply can output unconventional voltages as electrical test waveforms, such as test pulses, fault signals, etc. When the second power supply interface VIN2 receives such unconventional voltages, the test load module M2 will also receive the unconventional voltage, and then provide the corresponding first power supply signal for the module to be tested. The module to be tested can connect the specific pin to be tested to the test load module M2, and observe the response of the module to be tested to the first power supply signal, thereby completing the electrical test.

[0050] Therefore, when the control switch SW0 is closed, the test load module M2 is connected to the second power interface VIN2 and the positive input terminal of the input transformer module V1, and each test channel is used to provide the first power supply signal corresponding to the external DC power supply or the input transformer module V1 to the module under test;

[0051] When the control switch SW0 is disconnected, the test load module M2 is connected to the second power interface VIN2, and each test channel is used to provide a first power supply signal corresponding to an external DC power supply to the module under test.

[0052] It is understandable that in order to more clearly indicate the different working modes of the test load box, an indicator light can be set based on the control switch SW0 to indicate the power supply mode or the test mode, such as Figure 2 The local circuit structure diagram is shown.

[0053] Specifically, for the power supply mode, the test load box further includes a first resistor R1 and a power supply indicator light Lamp1 , and the power supply indicator light Lamp1 and the first resistor R1 are connected in series between the cathode of the first diode D1 and the first end of the control switch SW0 .

[0054] It can be understood that the power indicator light Lamp1 and the first resistor R1 are connected in series between the cathode of the first diode D1 and the first end of the control switch SW0. When the control switch SW0 is closed and any external power source is connected to the test load box, the power indicator light Lamp1 will light up to indicate that the current test load box is in the power supply mode; when the control switch SW0 is disconnected, regardless of whether an external power source is connected to the test load box, the power indicator light Lamp1 is off to indicate that the current test load box is not in the power supply mode.

[0055] It is understandable that the on / off state of the power indicator light Lamp1 depends on whether the power indicator light Lamp1 is in the path, and has nothing to do with the specific connection sequence of the power indicator light Lamp1 and the first resistor R1, which is not required here.

[0056] Specifically, for the test mode, the test load box further includes a second resistor R2, a third resistor R3, an electric test indicator lamp Lamp2 and a switch tube Q, wherein:

[0057] The second resistor R2 and the electric test indicator lamp Lamp2 are connected in series between the cathode of the first diode D1 and the first end of the switch tube Q;

[0058] A first end of the third resistor R3 is connected to the cathode of the first diode D1, and a second end of the third resistor R3 is connected to the control end of the switch tube Q and the first end of the control switch SW0 respectively;

[0059] The second end of the switch tube Q is connected to the ground end;

[0060] When the control switch SW0 is closed, the internal circuit between the first end and the second end of the switch tube Q is disconnected, and when the control switch SW0 is disconnected, the internal circuit between the first end and the second end of the switch tube Q is connected.

[0061] It can be understood that the switch tube Q here can be selected from a triode, a MOS tube or an IGBT tube. There is no restriction on the selection of the switch tube Q here, as long as the switch tube Q can achieve the purpose of "when the control switch SW0 is closed, the internal circuit between the first end and the second end of the switch tube Q is disconnected, and when the control switch SW0 is disconnected, the internal circuit between the first end and the second end of the switch tube Q is turned on" based on the current circuit connection structure.

[0062] Specifically, Figure 2 Taking the switch tube Q as an NMOS tube as an example, the first end, the second end, and the control end of the switch tube Q are respectively the drain D, the source S, and the gate G of the NMOS tube. A body diode may also be provided inside the NMOS tube.

[0063] like Figure 2As shown, according to the connection relationship among the control switch SW0, the second resistor R2, the third resistor R3, the electric test indicator lamp Lamp2 and the switch tube Q, when the control switch SW0 is closed, the gate G and the source S of the NMOS tube are both grounded, the internal circuit of the drain D and the source S of the NMOS tube is disconnected, and the electric test indicator lamp Lamp2 is in an off state to indicate that the current test load box is not in the test mode; when the control switch SW0 is disconnected, if there is any external power supply connected to the test load box, the gate G of the NMOS tube is pulled up to the power supply by the third resistor R3, so the internal circuit of the drain D and the source S of the NMOS tube is turned on, and the electric test indicator lamp Lamp2 will light up to indicate that the current test load box is in the test mode.

[0064] It is understandable that, as mentioned above, in order to ensure that the level is not disturbed and there is no interference between the power supplies, when the control switch SW0 is closed, only one of the first power interface VIN1 and the second power interface VIN2 is connected to the external power supply at the same time. However, this requirement of only one external power supply being connected at the same time cannot ensure that the operator can accurately perform it. If the operator makes a mistake by connecting the external DC power supply and the external AC power supply at the same time and closing the control switch SW0, when the test load box is internally turned on, interference may occur between the power supplies, and the test load box may be damaged.

[0065] Furthermore, considering the protection of the input transformer module V1, a third anti-reverse diode D3 may be provided at the output end of the input transformer module V1. Similarly, for the protection of the external DC power supply, a fourth anti-reverse diode D4 may be provided at the positive power interface of the second power interface VIN2. Specifically, Figure 2 As shown, the test load box further includes at least one of a third diode D3 and a fourth diode D4, wherein:

[0066] The positive output terminal of the input transformer module V1 is connected to the positive input terminal of the power supply load module M1 through the third diode D3, and the internal current direction of the third diode D3 flows from the positive output terminal of the input transformer module V1 to the positive input terminal of the power supply load module M1;

[0067] The positive power interface of the second power interface VIN2 is connected to the positive electrode of the second diode D2, the second end of the normally open contact K1, and the positive input end of the test load module M2 through the fourth diode D4. The internal current direction of the fourth diode D4 is from the positive power interface of the second power interface VIN2 to the positive electrode of the second diode D2.

[0068] It can be understood that the anti-reverse scenario is specifically: when the control switch SW0 is in a closed state, if the first power interface VIN1 and the second power interface VIN2 are connected to an external power supply at the same time, the normally open contact K1 is closed, and the output of the input transformer module V1 may flow back to the external DC power supply of the second power interface VIN2, and the output of the second power interface VIN2 may flow back to the input transformer module V1. Therefore, this embodiment adds at least one of the third diode D3 and the fourth diode D4, so that even if an erroneous operation of simultaneously connecting to an external DC power supply and an external AC power supply occurs, damage to the test load box can be avoided.

[0069] It can be understood that in this embodiment, at least one of the third diode D3 and the fourth diode D4 is added. Specifically, one of the third diode D3 and the fourth diode D4 can be added, or the third diode D3 and the fourth diode D4 can be added at the same time. The specific additional scheme can be selected according to the specific voltage values ​​of the input transformer module V1 and the second power supply interface VIN2, and is not limited here.

[0070] It can be understood that, in the test load box of the present embodiment, the connection between the first power interface VIN1, the second power interface VIN2, the input transformer module V1, the control switch SW0, the circuit breaker relay1, the first diode D1, and the second diode D2 realizes the internal signal input of the power supply load module M1 and the test load module M2. The power supply load module M1 and the test load module M2 are the parts of the test load box that are directly connected to the module to be tested. Each power supply load channel in the power supply load module M1 can be connected to a specific pin of the module to be tested, and each test channel in the test load module M2 can be connected to a specific pin of the module to be tested. Based on the internal signal input, the power supply load channel and the test channel can output corresponding signals to the pins of the module to be tested, or form a test response of the pins of the module to be tested.

[0071] Specifically, the power supply load channel and the test channel are essentially connection channels, that is, the connection line is the main body, and the end of the connection channel is used as a channel interface to connect to the specific pins of the module to be tested. In addition to the connection line, the connection channel can also include loads of different structures, different resistance values, different inductances, or different levels and forms of electrical signals, which can be set according to actual needs.

[0072] In this embodiment, the module to be tested may be an ECU, so the test load box may be applied to the test of the ECU. Figure 3 FIG. 1 is a partial circuit diagram of another test load box provided in an embodiment of the present application. Figure 3As shown in the figure, the part connecting the test load module M2 and the normally open contact K1 is called the test bus BAT BUS. The test channel in the figure is only a connecting line, without connecting to other loads, and only receives the first power supply signal transmitted by the test bus BAT BUS. The test channels in the figure are Other powersupply1 from BAT+to ECU, Other power supply2 from BAT+to ECU, and Other powersupply3 from BAT+to ECU. Of course, the number of test channels can be further expanded.

[0073] Furthermore, the test load module M2 may also include a wake-up signal channel KL15 for providing a wake-up signal to the ECU; a power supply channel KL30 for providing power to the ECU; and a grounding channel KL31 for providing a grounding terminal to the ECU. Therefore:

[0074] The test load module M2 also includes a power channel, a wake-up signal channel and a ground channel;

[0075] The input ends of all test channels, the input end of the power supply channel, and the input end of the wake-up signal channel are connected to the first common point, and the first common point serves as the positive input end of the test load module M2;

[0076] The input end of the ground channel is connected to the ground end, serving as the negative input end of the test load module M2;

[0077] Each test channel, power channel, wake-up signal channel, and ground channel is internally connected respectively;

[0078] The output end of each test channel is used to connect to the pin to be tested of the module to be tested and provide a first power supply signal to the pin to be tested;

[0079] The output end of the power supply channel is used to connect to the power supply pin of the module to be tested and provide a first power supply signal to the power supply pin;

[0080] The output end of the wake-up signal channel is used to connect the wake-up signal pin of the module to be tested and provide a first power supply signal to the wake-up signal pin;

[0081] The output end of the ground channel is used to connect the ground pin of the module under test.

[0082] Similarly, the output end of each of the multiple power supply load channels in the power supply load module M1 is connected to a specific pin of the module to be tested, and provides a corresponding second power supply signal or load signal for the pin. Specifically, the second power supply signal includes electrical signals of different levels or forms, and the load signal includes signals corresponding to loads of different structures, different resistance values, and different inductances, so:

[0083] The power supply load channel includes at least one of a power supply signal channel, a periodic signal channel, and a high-side load channel, wherein:

[0084] Each power supply signal channel includes an intermediate transformer module for voltage regulation, and the input end of the intermediate transformer module is connected to the output end of the input transformer module V1 or the output end of other intermediate transformer modules;

[0085] One or more output terminals of the intermediate transformer module are used to connect to the power supply pin of the module to be tested and provide a second power supply signal to the power supply pin;

[0086] Each periodic signal channel includes a signal generator for modulating the periodic signal, and the input end of the signal generator is connected to the output end of the input transformer module V1 or the output end of any intermediate transformer module;

[0087] One or more output terminals of the signal generator are used to connect to the periodic signal pin of the module to be tested and provide the corresponding periodic signal to the periodic signal pin;

[0088] Each high-side load channel includes a first load unit, and a first end of the first load unit is connected to the positive output end of the input transformer module V1 or the positive output end of any intermediate transformer module;

[0089] The second end of the first load unit serves as an output end of the high-side load channel, and is used to connect to the high-side load pin of the module to be tested and provide a corresponding load signal to the high-side load pin.

[0090] It can be understood that the intermediate voltage transformation module in each power supply signal channel transforms the received voltage into other voltages and outputs the voltage, and the output voltage is also the second power supply signal provided by the power supply signal channel to the power pin;

[0091] The signal generator in each periodic signal channel converts the received voltage signal into other forms of periodic signals, such as a pulse signal with a specific duty cycle or a triangular wave signal light. The output end of the signal generator is connected to the periodic signal pin of the module to be tested as a channel terminal and provides a periodic signal to the periodic signal pin;

[0092] The first load unit in each high-side load channel includes a load with a specific resistance value and structure, and one end of the first load unit is connected to a high level, and the other end of the first load unit is connected to the high-side load pin of the module to be tested as a channel terminal, and provides a corresponding load signal to the high-side load pin.

[0093] It is understandable that the above does not restrict the specific connection of the intermediate transformer modules. The specific connection relationship and value setting of the intermediate transformer modules can be designed according to the voltage level requirements of the power supply load module M1. Usually, multiple intermediate transformer modules are cascaded, that is, the voltage level gradually decreases. Figure 3 As shown, V2 and V3 are both intermediate transformer modules. V2 converts the DC voltage output by the input transformer module V1 or the external DC power supply into a stable DC voltage of 12V. The allowable input voltage range of V2 is between 6 and 36V. At this time, the five output terminals of V2 are respectively recorded as: PSL_12V_OUT1-PSL_12V_OUT5, which are used to provide 12V power supply for ECU, and more channels can be expanded; the input terminal of V3 is connected to the output terminal of V2, and the 12V DC voltage is converted into a stable DC voltage of 5V. At this time, the five output terminals of V3 are respectively recorded as: PSL_5V_OUT1-PSL_5V_OUT5, which are used to provide 5V power supply for ECU, and more channels can be expanded.

[0094] Furthermore, the signal generator in the periodic signal channel needs to be connected to a transformer module of the corresponding voltage level, such as Figure 3 As shown, G1 and G2 are both signal generators that output PWM signals. The input end of G1 is connected to the output end of V2. G1 generates a corresponding 12V PWM signal based on the DC voltage of V2. At this time, the five output ends of G1 are respectively recorded as: 12V_PWM_OUT1-12V_PWM_OUT5, which are used to provide 12V PWM signals for the ECU, and more channels can be expanded; the input end of G2 is connected to the output end of V3. G1 generates a corresponding 5V PWM signal based on the DC voltage of V3. At this time, the five output ends of G3 are respectively recorded as: 5V_PWM_OUT1-5V_PWM_OUT5, which are used to provide 5V PWM signals for the ECU, and more channels can be expanded.

[0095] Similarly, the first load unit in the high-side load channel needs to be connected to the positive output terminal of the corresponding voltage transformer module, such as Figure 3 As shown, the output ends of the five high-side load channels are respectively recorded as: HSD_Load1-HSD_Load5, and the first ends of the first load units are all connected to the positive output end of V2. The output ends of these five high-side load channels can provide high-side loads for the ECU.

[0096] It can be understood that the number of the above power supply signal channels, the number of periodic signal channels, the number of high-side load channels, the number of intermediate transformer modules, the number of output terminals of the signal generator, the specific output parameters of the intermediate transformer module, the specific output parameters of the signal generator, the specific structure and parameters of the first load unit, the input terminal connection object of the intermediate transformer module, the input terminal connection object of the signal generator, and the input terminal connection object of the first load unit can all be adjusted and set according to actual conditions and a wide range of user needs, and are not limited here.

[0097] Furthermore, the power supply load channels in the above power supply load module M1 are all channels connected to the power supply source. In the power supply load module M1, a channel that is not connected to the input transformer module or other intermediate transformer modules and only includes a load can also be set. Specifically, the power supply load module M1 also includes at least one of a low-side load channel, an H-bridge load channel, and a high-voltage interlock test channel, wherein:

[0098] Each low-side load channel includes a second load unit, an input end of the second load unit is connected to the ground end, and a second end of the second load unit serves as an output end of the low-side load channel, and is used to connect to the low-side load pin of the module to be tested and provide a corresponding load signal to the low-side load pin;

[0099] Each H-bridge load channel includes an H-bridge load unit, and two ends of the H-bridge load unit serve as a first output end and a second output end of the H-bridge load channel, and are connected to an H-bridge load pin pair of the unit under test, for providing a corresponding load signal to the H-bridge load pin pair;

[0100] Each high-voltage interlock test channel includes a high-voltage interlock switch, and the two ends of the high-voltage interlock switch serve as the first output end and the second output end of the high-voltage interlock test channel, which are connected to a high-voltage interlock pin pair of the unit under test, and are used to provide a corresponding load signal to the high-voltage interlock pin pair.

[0101] like Figure 3As shown, the output ends of the five low-side load channels are respectively recorded as: LSD_Load1-LSD_Load5, which are used to provide low-side loads for the ECU; the three H-bridge load units can be recorded as HBD_Load1-HBD_Load3, the first output ends of the three H-bridge load channels can be respectively recorded as: HBD_Load1_IN-HBD_Load3_IN, and the second output ends of the three H-bridge load channels can be respectively recorded as: HBD_Loadl_OUT-HBD_Load3_OUT, which are used to provide H-bridge loads for the ECU, and the specific H-bridge load units can be realized by a motor with an H-bridge structure; the three high-voltage interlock switches can be respectively recorded as SW1-SW3, the first output ends of the corresponding three high-voltage interlock test channels can be respectively recorded as: HVIL1_IN-HVIL3_IN, and the second output ends of the corresponding three high-voltage interlock test channels can be respectively recorded as: HVILL_OUT-HVIL3_OUT, which are used to provide the ECU with a load signal corresponding to the high-voltage interlock pin, so that the ECU responds based on the current state of the high-voltage interlock test channel.

[0102] Furthermore, fuses corresponding to different positions can be set in the test load box (such as Figure 2 and Figure 3 F1-F3), status indicators at different locations (such as Figure 3 Lamp3 / Lamp4 in), cooling fan (such as Figure 3 FAN1 / FAN2 in the figure), so the power supply load module M1 may also include at least one of a cooling fan and a status indicator light;

[0103] The power supply end of the cooling fan is connected to the positive output end of any intermediate transformer module;

[0104] The power supply terminal of the status indicator light is connected to the positive output terminal of any intermediate transformer module.

[0105] Furthermore, the status indicator light and the fuse can work in combination to provide more accurate status positioning. Specifically, the power supply load module also includes a status indication unit, which includes two status indicator lights and a status fuse, wherein:

[0106] The output end of any intermediate transformer module is connected to the power pin of the module to be tested through a status fuse;

[0107] The power supply ends of the two status indicator lights are respectively connected to the two ends of the status fuse.

[0108] like Figure 3In the example, the status fuse is F2, and the status indicators are Lamp3 and Lamp4. When both Lamp3 and Lamp4 are on, it proves that the circuit is normal. When Lamp3 is on but Lamp4 is off, it proves that the status fuse F2 is disconnected. It can be understood that Figure 3 The resistors R12 and R16 are protective resistors connected in series to the power supply end of the status indicator light.

[0109] It can be understood that based on the first power interface, the second power interface and the mode switch in the test load box in this embodiment, different power supplies and working modes can be set for the test load box, and based on the test load module and the power supply load module, the ECU can select the required channel access and perform the test. The test load box in this embodiment can meet multiple power requirements and multiple load requirements, and is suitable for various different ECU tests.

[0110] Compared with the prior art, the beneficial effects of the embodiments of the present application include at least the following: the embodiments of the present application realize AC / DC conversion when connected to an external AC power supply through a first power supply interface and an input transformer module, and based on the connection relationship between the first power supply interface, the second power supply interface, the input transformer module, the first diode and the second diode, both the external AC power supply and the external DC power supply can make the load box of this embodiment work; based on the connection relationship between the control switch and the peripheral components, the power supply signal output by the power supply load module and the test load module can be controlled by the on-off state of the control switch, which can be used for functional debugging of the module to be tested during the development process when the control switch is closed, and can also be used for electrical testing by controlling the input signal of the second power supply interface when the control switch is disconnected; the test load module and the power supply load module of this scheme can provide various types of test signals, which can be adapted to the development of ECUs with various functions, thereby greatly saving testing costs and shortening the development cycle.

[0111] All the above optional technical solutions can be arbitrarily combined to form optional embodiments of the present application, which will not be described one by one here.

[0112] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A test load box, characterized in that: It includes a first power interface, a second power interface, an input transformer module, a power supply load module, a control switch, a circuit breaker, a first diode, a second diode, and a test load module, wherein: The first power interface is used to connect to an external AC power source; The input end of the input transformer module is connected to the first power interface, and the positive output end of the input transformer module is connected to the positive input end of the power supply load module; The positive power interface and the negative power interface of the second power interface are used to connect the positive electrode and the negative electrode of the external DC power supply respectively; The negative output terminal of the input transformer module is respectively connected to the negative input terminal of the power supply load module, the negative power interface of the second power interface, and the ground terminal; The positive input terminal of the input transformer module is also connected to the positive electrode of the first diode and the first end of the normally open contact of the circuit breaker; The positive power interface of the second power interface is also connected to the anode of the second diode, the second end of the normally open contact, and the positive input end of the test load module; The cathode of the first diode is connected to the cathode of the second diode and the first end of the coil of the circuit breaker respectively; The first end of the control switch is connected to the second end of the coil, and the second end of the control switch is connected to the ground end; The input voltage conversion module is used to convert AC voltage into DC voltage; The test load module comprises a plurality of test channels, each of which is used to provide a first power supply signal corresponding to the external DC power supply or the input transformer module to the module under test; The power supply load module includes a plurality of power supply load channels, each of which is used to provide the module to be tested with a second power supply signal or a load signal corresponding to the current power supply load channel.

2. The test load box according to claim 1, characterized in that: It also includes a first resistor and a power supply indicator light, wherein the power supply indicator light and the first resistor are connected in series between the cathode of the first diode and the first end of the control switch.

3. The test load box according to claim 1, characterized in that: It also includes a second resistor, a third resistor, an electric test indicator light and a switch tube, wherein: The second resistor and the electric test indicator light are connected in series between the cathode of the first diode and the first end of the switch tube; The first end of the third resistor is connected to the cathode of the first diode, and the second end of the third resistor is connected to the control end of the switch tube and the first end of the control switch respectively; The second end of the switch tube is connected to the ground end; When the control switch is closed, the internal circuit between the first end and the second end of the switch tube is disconnected, and when the control switch is disconnected, the internal circuit between the first end and the second end of the switch tube is connected.

4. The test load box according to claim 1, characterized in that: Also included is at least one of a third diode and a fourth diode, wherein: The positive output end of the input transformer module is connected to the positive input end of the power supply load module through the third diode, and the internal current direction of the third diode flows from the positive output end of the input transformer module to the positive input end of the power supply load module; The positive power interface of the second power interface is connected to the anode of the second diode, the second end of the normally open contact, and the positive input end of the test load module through the fourth diode, and the internal current direction of the fourth diode is from the positive power interface of the second power interface to the anode of the second diode.

5. The test load box according to claim 1, characterized in that: When the control switch is closed, the test load module is connected to the second power supply interface and the positive input end of the input transformer module, and each of the test channels is used to provide the first power supply signal corresponding to the external DC power supply or the input transformer module to the module under test; When the control switch is disconnected, the test load module is connected to the second power supply interface, and each of the test channels is used to provide the first power supply signal corresponding to the external DC power supply to the module under test.

6. The test load box according to claim 1, characterized in that: The test load module also includes a power channel, a wake-up signal channel and a ground channel; The input ends of all the test channels, the input end of the power supply channel, and the input end of the wake-up signal channel are connected to a first common point, and the first common point serves as a positive input end of the test load module; The input end of the ground channel is connected to the ground end and serves as the negative input end of the test load module; The insides of each of the test channel, the power channel, the wake-up signal channel, and the ground channel are respectively connected; The output end of each of the test channels is used to connect to the pin to be tested of the module to be tested and provide the first power supply signal to the pin to be tested; The output end of the power supply channel is used to connect to the power supply pin of the module to be tested and provide the first power supply signal to the power supply pin; The output end of the wake-up signal channel is used to connect the wake-up signal pin of the module to be tested and provide the first power supply signal to the wake-up signal pin; The output end of the grounding channel is used to connect the grounding pin of the module to be tested.

7. The test load box according to any one of claims 1 to 6, characterized in that: The power supply load channel includes at least one of a power supply signal channel, a periodic signal channel, and a high-side load channel, wherein: Each of the power supply signal channels comprises an intermediate transformer module for voltage regulation, wherein the input end of the intermediate transformer module is connected to the output end of the input transformer module or the output end of other intermediate transformer modules; One or more output terminals of the intermediate voltage transformation module are used to connect to the power pin of the module to be tested and provide the second power supply signal to the power pin; Each of the periodic signal channels comprises a signal generator for modulating the periodic signal, the input end of the signal generator being connected to the output end of the input voltage conversion module or the output end of any of the intermediate voltage conversion modules; The one or more output terminals of the signal generator are used to connect to the periodic signal pin of the module to be tested and provide the corresponding periodic signal to the periodic signal pin; Each of the high-side load channels comprises a first load unit, a first end of the first load unit being connected to the positive output end of the input transformer module or the positive output end of any of the intermediate transformer modules; The second end of the first load unit serves as the output end of the high-side load channel, and is used to connect the high-side load pin of the module to be tested and provide the corresponding load signal to the high-side load pin.

8. The test load box according to claim 7, characterized in that: The power supply load module further includes at least one of a low-side load channel, an H-bridge load channel, and a high-voltage interlock test channel, wherein: Each of the low-side load channels comprises a second load unit, an input end of the second load unit is connected to the ground end, and a second end of the second load unit serves as an output end of the low-side load channel, and is used to connect to a low-side load pin of the module to be tested and provide the corresponding load signal to the low-side load pin; Each of the H-bridge load channels comprises an H-bridge load unit, and two ends of the H-bridge load unit serve as a first output end and a second output end of the H-bridge load channel, and are connected to an H-bridge load pin pair of the module to be tested, so as to provide the corresponding load signal to the H-bridge load pin pair; Each of the high-voltage interlock test channels includes a high-voltage interlock switch, and two ends of the high-voltage interlock switch serve as the first output end and the second output end of the high-voltage interlock test channel, and are connected to a high-voltage interlock pin pair of the module to be tested, for providing the corresponding load signal to the high-voltage interlock pin pair.

9. The test load box according to claim 7, characterized in that: The power supply load module further includes at least one of a cooling fan and a status indicator light; The power supply end of the cooling fan is connected to the positive output end of any intermediate transformer module; The power supply end of the status indicator light is connected to the positive output end of any intermediate transformer module.

10. The test load box according to claim 7, characterized in that: The power supply load module further includes a status indication unit, which includes two status indicator lights and a status fuse, wherein: The output end of any of the intermediate transformer modules is connected to the power pin of the module to be tested through the status fuse; The power supply ends of the two status indicator lights are respectively connected to the two ends of the status fuse.

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