Switchable test circuit for electric bicycle mutual identification protocol test

Abstract

The utility model belongs to the protocol test field, and discloses a switchable test circuit used for an electric bicycle mutual identification protocol test. The switchable test circuit comprises an AC power supply detection circuit, an AC load detection circuit and a DC power supply load detection circuit which are connected to a tested product through a general standard socket. The direct-current power supply load detection circuit comprises a direct-current power supply, a direct-current load, a direct-current voltage stabilization source and a direct-current contactor, wherein the direct-current contactor is used for switching the working states of the direct-current power supply, the direct-current load and the direct-current voltage stabilization source in an electric bicycle mutual identification protocol test. According to the utility model, through integration of equipment and integration of circuits required by various tests, the purpose that one rack can carry out various tests is achieved, the test environment building time is shortened, and errors caused by differences of test environments built every time are reduced.

Description

Technical Field

[0001] The utility model belongs to the field of protocol testing, and in particular relates to a switchable test circuit for mutual recognition protocol testing of electric bicycles. Background Art

[0002] The implementation of the new national standards GB42295-2022 "Electrical Safety Requirements for Electric Bicycles" and GB42296-2022 "Safety Technical Requirements for Electric Bicycle Chargers" put forward test requirements for mutual recognition, coordination, and tamper-proofing between electric bicycle chargers, battery systems, and complete vehicles. Therefore, the electrical environment, communication modules, and test software required for the test are required. Due to the tests on these three types of products (chargers, battery systems, and complete vehicles), there are many types and specifications of equipment required to build the electrical environment, involving AC sources, DC sources, voltage regulators, DC loads, data acquisition instruments, voltage and current sensors, oscilloscopes, etc. Although most of the relevant hardware equipment can be purchased, the configuration of each test is cumbersome.

[0003] At present, the mutual recognition agreement test of electric bicycles is mostly based on manual testing. In manual testing, it is necessary to first build a test environment according to the requirements of each test, gather the equipment required for the test, manually adjust the corresponding equipment according to the test process, and record the data required for the test. However, the equipment type and specifications required for each test are different, and it is time-consuming and labor-intensive to manually build the test environment each time. Utility Model Content

[0004] In order to overcome the defects in the prior art, the purpose of the utility model is to provide a switchable test circuit for electric bicycle mutual recognition protocol testing.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A switchable test circuit for electric bicycle mutual recognition protocol testing, the switchable test circuit for electric bicycle mutual recognition protocol testing comprising: an AC power supply detection circuit, an AC load detection circuit and a DC power supply load detection circuit connected to a test product through a universal standard socket, the DC power supply load detection circuit comprising a DC power supply, a DC load, a DC voltage stabilizing source and a DC contactor, the DC contactor being used to switch the working states of the DC power supply, the DC load and the DC voltage stabilizing source in the electric bicycle mutual recognition protocol test.

[0007] Several optional methods are also provided below, but they are not intended to be additional limitations on the above-mentioned overall solution, but are merely further supplements or preferences. Under the premise that there are no technical or logical contradictions, each optional method can be combined with the above-mentioned overall solution separately, and multiple optional methods can also be combined.

[0008] Preferably, the AC power supply detection circuit comprises: an AC power supply, a current sensor A1, a voltage sensor U1 and a universal standard socket A;

[0009] The AC power source is connected to a universal standard socket A via a current sensor A1 , and the voltage sensor U1 is connected in parallel with the current sensor A1 .

[0010] Preferably, the AC load detection circuit comprises: an AC load, a current sensor A4, a voltage sensor U4 and a universal standard socket E;

[0011] The AC load is connected to the universal standard socket E via a current sensor A4 , and the voltage sensor U4 is connected in parallel with the current sensor A4 .

[0012] Preferably, the DC power supply load detection circuit comprises: the DC power supply, the DC load, the DC voltage regulated source, the current sensor A2, the current sensor A3, the voltage sensor U2, the voltage sensor U3, the universal standard socket B, the universal standard socket C, the universal standard socket D, the DC contactor K1, the DC contactor K2, the DC contactor K3, the DC contactor K4, the DC contactor K6, the DC contactor K7, the DC contactor K8 and the DC contactor group KM;

[0013] The universal standard socket B is connected to the DC contactor K1, the current sensor A2, the DC contactor group KM, the DC contactor K4 and the universal standard socket C in sequence. The end of the DC contactor K1 connected to the current sensor A2 is also connected to the DC contactor K2. The other end of the DC contactor K2 is connected to a DC power supply. The voltage sensor U2 is connected in parallel with the current sensor A2. The end of the current sensor A2 connected to the DC contactor group KM is also connected to the DC contactor K3. The other end of the DC contactor K3 is connected to a DC load. The DC contactor K4 is connected to the universal standard socket C. One end of the socket C is also connected to a DC contactor K8, the other end of the DC contactor K8 is connected to a DC voltage stabilizing source, one end of the DC contactor K3 connected to the DC load is also connected to a DC contactor K6, the other end of the DC contactor K6 is connected to a current sensor A3, the other end of the current sensor A3 is connected to a universal standard socket D, the voltage sensor U3 is connected in parallel with the current sensor A3, one end of the DC contactor K7 is connected between the DC contactor group KM and the DC contactor K4, and the other end of the DC contactor K7 is connected between the DC contactor K6 and the current sensor A3.

[0014] Preferably, the DC power supply load detection circuit further includes a DC contactor K5, and the DC contactor K5 is connected in parallel with the wire located between the DC contactor group KM and the DC contactor K4.

[0015] Preferably, the DC contactor is controlled by a PLC controller or a relay control box.

[0016] The utility model provides a switchable test circuit for electric bicycle mutual recognition protocol testing. Through the integration of equipment and circuits required for multiple tests, a test bench can be used to perform multiple tests, reducing the time for setting up the test environment and the error introduced by the difference in the test environment each time. The switchable test circuit lays a hardware foundation for the separate testing of chargers, battery systems, and complete vehicle products. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of the hardware integration design part of an electric bicycle mutual recognition protocol test system of the utility model;

[0018] Figure 2 The figure is a schematic diagram of the switching control of the DC contactor of the utility model. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] It should be noted that when a component is referred to as being “connected” to another component, it may be directly connected to the other component or there may be a central component; when a component is referred to as being “fixed” to another component, it may be directly fixed to the other component or there may be a central component.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0022] In order to meet the needs of the new national standard mutual recognition protocol test for electric bicycles and solve the problem that a separate test environment needs to be built for each test, this embodiment provides a switchable test circuit for the mutual recognition protocol test for electric bicycles.

[0023] In the mutual recognition agreement test of electric bicycles, it is necessary to provide adjustable AC source input and adjustable DC load for the charger product; provide DC charging and DC load for the battery system, and simulate the charger end for mutual recognition and coordination and simulate the vehicle end for mutual recognition and coordination.

[0024] Therefore, this embodiment provides a switchable test circuit based on a DC contactor, and the switchable test circuit provides a universal standard socket for connecting the tested product. A variety of test environments are provided through the equipment integration solution, integrating AC source, DC source, AC load, DC load, battery simulator, data acquisition instrument, voltage / current, AC / DC contactor, RS485\RS232 communication bus, and new national standard charging / discharging interface socket and circuit switching control.

[0025] Specific as Figure 1 As shown, the switchable test circuit of this embodiment includes an AC power supply detection circuit, an AC load detection circuit and a DC power supply load detection circuit.

[0026] (1) AC power supply detection circuit: used to provide AC power output and voltage and current detection, specifically including: AC power source (ACSource), current sensor A1, voltage sensor U1 and universal standard socket A. The AC power source is connected to the universal standard socket A through the current sensor A1, and the voltage sensor U1 is connected in parallel with the current sensor A1.

[0027] (2) AC load detection circuit: used to provide detection of AC load, voltage and current, specifically including: AC load, current sensor A4, voltage sensor U4 and universal standard socket E. The AC load is connected to the universal standard socket E through the current sensor A4, and the voltage sensor U4 is connected in parallel with the current sensor A4.

[0028] (3) DC power supply load detection circuit: used to provide DC output, DC load, voltage and current detection, specifically including: DC power supply (DCSource), DC load (DCLoad), DC voltage regulator, current sensor A2, current sensor A3, voltage sensor U2, voltage sensor U3, universal standard socket B, universal standard socket C, universal standard socket D, DC contactor K1, DC contactor K2, DC contactor K3, DC contactor K4, DC contactor K6, DC contactor K7, DC contactor K8 and DC contactor group KM. The DC contactor is used to switch the working state of the DC power supply, DC load and DC voltage regulator in the electric bicycle mutual recognition protocol test. When the DC power supply, DC load or DC voltage regulator participates in the electric bicycle mutual recognition protocol test, its working state is participating in the test; otherwise, its working state is not participating in the test, which is determined by the closing or opening of the DC contactor.

[0029] The universal standard socket B is connected to the DC contactor K1, the current sensor A2, the DC contactor group KM, the DC contactor K4 and the universal standard socket C in sequence. The end of the DC contactor K1 connected to the current sensor A2 is also connected to the DC contactor K2. The other end of the DC contactor K2 is connected to a DC power supply. The voltage sensor U2 is connected in parallel with the current sensor A2. The end of the current sensor A2 connected to the DC contactor group KM is also connected to the DC contactor K3. The other end of the DC contactor K3 is connected to a DC load. The DC contactor K4 is connected to the universal standard socket One end of C is also connected to a DC contactor K8, and the other end of the DC contactor K8 is connected to a DC voltage stabilizing source. One end of the DC contactor K3 connected to the DC load is also connected to a DC contactor K6, and the other end of the DC contactor K6 is connected to a current sensor A3, and the other end of the current sensor A3 is connected to a universal standard socket D. The voltage sensor U3 is connected in parallel with the current sensor A3. One end of the DC contactor K7 is connected between the DC contactor group KM and the DC contactor K4, and the other end of the DC contactor K7 is connected between the DC contactor K6 and the current sensor A3.

[0030] In addition, according to the national standard requirements for the electric bicycle mutual recognition agreement test, the DC power supply load detection circuit of this embodiment can also include a DC contactor K5, which is connected in parallel with the wire located between the DC contactor group KM and the DC contactor K4 to provide a circuit with a different impedance from the parallel wire.

[0031] In the switchable test circuit of this embodiment, the current sensor is used to measure the current value of the AC / DC line, for example, the model SCT-013-030, ACS758ECB-100B, etc.; the voltage sensor is used to measure the voltage value of the AC / DC line, for example, the model SVP-4200, MWB20-WBV332S51-0.2, etc.; the DC contactor is used to realize the circuit environment construction during different tests, for example, the CZ series, MJZ series, etc. are used; the universal standard socket is used for the product to directly connect to the test circuit, among which the universal standard socket A and the universal standard socket E are standard three-hole 16A AC sockets, and the universal standard socket B, the universal standard socket C, and the universal standard socket D are 50A Anderson plugs; the DC power supply is used to simulate the battery pack voltage or the charger output side; the DC load is used to simulate the battery pack discharge load or the charger load side, the DC load can use a resistor load, a constant current load or a constant voltage load, etc., and the AC load can use a resistive load, an inductive load or a capacitive load, etc.

[0032] This embodiment realizes the construction of various test environments through switchable test circuits, improves test efficiency, and can timely cut off and terminate the test when the test is abnormal, thus playing the role of emergency stop protection. Figure 2As shown, the control of the DC contactor can be controlled by the PLC controller / relay control box, which controls the action of the DC contactor on the main circuit through the opening and closing of the auxiliary relay, combines into a new circuit path, connects the corresponding equipment, and realizes the circuit switching of multiple test items. In this embodiment, auxiliary relays 1 to 8 are respectively connected to DC contactors K1-K8, and auxiliary relays 9 and 10 jointly control the DC contactor group KM. Based on this, the switchable test circuit provided in this embodiment can switch the test circuit built as follows:

[0033] (A) Battery charging overvoltage protection test circuit: The charging end of the tested battery protection board is connected to the universal standard socket C, and the battery pack end is connected to the universal standard socket D. The PLC controller / relay control box closes auxiliary relays 2, 4, and 6. Auxiliary relays 2, 4, and 6 control the DC contactors K2, K4, and K6 to close. The circuit required for the test is constructed. This circuit is connected with a DC power supply, a DC load, a voltage sensor U2, a current sensor A2, a voltage sensor U3, and a current sensor A3.

[0034] (B) Battery charging overcurrent protection test circuit: The charging end of the tested battery protection board is connected to the universal standard socket C, and the battery pack end is connected to the universal standard socket D. The PLC controller / relay control box closes auxiliary relays 2, 4, and 6. Auxiliary relays 2, 4, and 6 control the DC contactors K2, K4, and K6 to close. The circuit required for the test is constructed. This circuit is connected with a DC power supply, a DC load, a voltage sensor U2, a current sensor A2, a voltage sensor U3, and a current sensor A3.

[0035] (C) Battery charging port misconnection protection test circuit: The charger output port is connected to the universal standard socket B, and the battery charging port is connected to the universal standard socket C. The PLC controller / relay control box closes auxiliary relays 1 and 4, and auxiliary relays 1 and 4 control DC contactors K1 and K4 to close. In case of misconnection, the PLC controller / relay control box controls auxiliary relays 9 and 10 to operate, and auxiliary relays 9 and 10 control DC contactor group KM to operate, completing the misconnection of positive and negative lines.

[0036] (D) Battery discharge protection test circuit: The discharge end of the tested battery protection board is connected to the universal standard socket D, the PLC controller / relay control box closes the auxiliary relay 6, and the auxiliary relay controls the DC contactor K6 to close, thus constructing the circuit required for the test. The DC load, voltage sensor U3 and current sensor A3 are connected to this circuit.

[0037] (E) Charger misconnection protection test circuit: The charger output port is connected to the universal standard socket B, and the battery charging port is connected to the universal standard socket C. The PLC controller / relay control box closes auxiliary relays 1 and 4, and auxiliary relays 1 and 4 control DC contactors K1 and K4 to close. When misconnection is performed, the PLC controller / relay control box controls auxiliary relays 9 and 10 to operate, and auxiliary relays 9 and 10 control DC contactor group KM to operate, completing the misconnection of the positive and negative lines.

[0038] (F) Charger component failure test, input current test, output current test, power adaptability test, overcharge cut-off test, and delayed cut-off test circuit: The charger input port is connected to the universal standard socket A, and the charger output port is connected to the universal standard socket B. The PLC controller / relay control box closes auxiliary relays 1 and 3. Auxiliary relays 1 and 3 control DC contactors K1 and K3 to close, and the circuit required for the test is constructed. This circuit is connected with an AC power supply, a DC load, a voltage sensor U1, a current sensor A1, a voltage sensor U2, and a current sensor A2.

[0039] (G) AC charging cabinet test circuit: The AC input side of the charging cabinet is connected to the universal standard socket A, and the AC output side of the charging cabinet is connected to the universal standard socket E. This circuit is connected with an AC power supply, an AC load, a voltage sensor U1, a current sensor A1, a voltage sensor U4 and a current sensor A4.

[0040] (H) DC charging cabinet test circuit: The AC input side of the charging cabinet is connected to the universal standard socket A, and the output side of the charging cabinet is connected to the universal standard socket D. The PLC controller / relay control box closes the auxiliary relay 6, and the auxiliary relay controls the DC contactor K6 to close. This circuit is connected to the AC power supply, DC load, voltage sensor U1, current sensor A1, voltage sensor U3 and current sensor A3.

[0041] The DC contactor group KM provides four connection terminals, with No. 1 and No. 2 connection terminals as positive terminals, No. 3 and No. 4 connection terminals as negative terminals, and the DC contactor group KM includes 4 DC contactors, with DC contactor a connected between No. 1 and No. 2 connection terminals, DC contactor b connected between No. 3 and No. 4 connection terminals, DC contactor c connected between No. 1 and No. 4 connection terminals, and DC contactor d connected between No. 3 and No. 2 connection terminals. In the DC contactor group KM, in the default state, DC contactors a and b are in a closed state, and DC contactors c and d are in an open state, at which time the two positive terminals are connected and the two negative terminals are connected; when the DC contactor group KM is actuated, DC contactors a and b are in an open state, and DC contactors c and d are in a closed state, at which time the two positive terminals and the two negative terminals are staggeredly connected, so as to facilitate the construction of the misconnection test circuit.

[0042] It should be noted that Figure 1 All shown in the figure are one wire, but in actual construction, one wire in the figure may contain multiple wires. For example, a universal standard socket may have three wires: positive, negative and ground. The DC contactor group KM involves two positive and negative wires. Electronic devices that only need to connect one wire (such as current sensors, DC contactors K1, etc.) are preferentially connected to the positive wire. Before the above test circuit is switched and constructed, the DC contactors K1-K8 are defaulted to the open state. And the test circuits illustrated in the above examples are only part of the test circuits that can be provided by the switchable test circuit of the utility model, and do not mean that the switchable test circuit of the utility model can only provide the above-mentioned types of test circuits illustrated in the examples. Other required test circuits can be switched and constructed according to the test standards.

[0043] During the electric bicycle mutual recognition agreement test process, if it is necessary to realize the test data collection and storage function, it is supported to introduce a data acquisition instrument. The data acquisition instrument collects level signals from voltage sensors and current sensors, and converts them into voltage and current data through the DMM module.

[0044] For the switchable test circuit of the utility model, different devices can be used as substitutes under the same topology. For example, a bidirectional DC source can be used to replace the ordinary DC power supply + load; other universal socket plugs can be used to replace the quick-connect socket connection of the universal standard socket A / B / C / D / E; a power analyzer can be used to replace the data acquisition instrument + sensor solution; a PLC can be used to replace the relay control box; more source and load devices can be used to replace the way of electronically controlled switching circuits.

[0045] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the attached claims.

Claims

1. A switchable test circuit for testing the mutual recognition protocol of electric bicycles, characterized in that: The switchable test circuit for the mutual recognition protocol test of electric bicycles includes: an AC power supply detection circuit, an AC load detection circuit and a DC power supply load detection circuit connected to the test product through a universal standard socket. The DC power supply load detection circuit includes a DC power supply, a DC load, a DC voltage stabilizing source and a DC contactor. The DC contactor is used to switch the working states of the DC power supply, the DC load and the DC voltage stabilizing source in the mutual recognition protocol test of electric bicycles.

2. The switchable test circuit for electric bicycle mutual recognition protocol testing according to claim 1, characterized in that: The AC power supply detection circuit comprises: an AC power supply, a current sensor A1, a voltage sensor U1 and a universal standard socket A; The AC power source is connected to a universal standard socket A via a current sensor A1 , and the voltage sensor U1 is connected in parallel with the current sensor A1 .

3. The switchable test circuit for electric bicycle mutual recognition protocol testing according to claim 1, characterized in that: The AC load detection circuit includes: an AC load, a current sensor A4, a voltage sensor U4 and a universal standard socket E; The AC load is connected to the universal standard socket E via a current sensor A4 , and the voltage sensor U4 is connected in parallel with the current sensor A4 .

4. The switchable test circuit for electric bicycle mutual recognition protocol testing according to claim 1, characterized in that: The DC power supply load detection circuit includes: the DC power supply, the DC load, the DC voltage stabilizing source, the current sensor A2, the current sensor A3, the voltage sensor U2, the voltage sensor U3, the universal standard socket B, the universal standard socket C, the universal standard socket D, the DC contactor K1, the DC contactor K2, the DC contactor K3, the DC contactor K4, the DC contactor K6, the DC contactor K7, the DC contactor K8 and the DC contactor group KM; The universal standard socket B is connected to the DC contactor K1, the current sensor A2, the DC contactor group KM, the DC contactor K4 and the universal standard socket C in sequence. The end of the DC contactor K1 connected to the current sensor A2 is also connected to the DC contactor K2. The other end of the DC contactor K2 is connected to a DC power supply. The voltage sensor U2 is connected in parallel with the current sensor A2. The end of the current sensor A2 connected to the DC contactor group KM is also connected to the DC contactor K3. The other end of the DC contactor K3 is connected to a DC load. The DC contactor K4 is connected to the universal standard socket C. One end of the socket C is also connected to a DC contactor K8, the other end of the DC contactor K8 is connected to a DC voltage stabilizing source, one end of the DC contactor K3 connected to the DC load is also connected to a DC contactor K6, the other end of the DC contactor K6 is connected to a current sensor A3, the other end of the current sensor A3 is connected to a universal standard socket D, the voltage sensor U3 is connected in parallel with the current sensor A3, one end of the DC contactor K7 is connected between the DC contactor group KM and the DC contactor K4, and the other end of the DC contactor K7 is connected between the DC contactor K6 and the current sensor A3.

5. The switchable test circuit for electric bicycle mutual recognition protocol testing according to claim 4, characterized in that: The DC power supply load detection circuit further includes a DC contactor K5, which is connected in parallel with the wire between the DC contactor group KM and the DC contactor K4.

6. The switchable test circuit for electric bicycle mutual recognition protocol testing according to claim 1, characterized in that: The DC contactor is controlled by a PLC controller or a relay control box.

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