Dummy battery circuit and electronic device

Abstract

The utility model provides a kind of false battery circuit and electronic equipment, the false battery circuit includes: voltage follower and electric energy output module;The output end of the electric energy output module is connected the input end of the voltage follower, the output end of the voltage follower is connected with the energy storage structure of PCBA test equipment being provided;The electric energy output module is for output power supply voltage to PCBA test equipment to carry out function test;The voltage follower is for in the case where the energy storage structure reversely outputs current, the reverse output current is discharged.The utility model outputs voltage by voltage follower, and absorbs the reverse output current of PCBA test equipment, realizes using same current channel to carry out PCBA charging and PCBA reverse charging.

Description

Technical Field

[0001] This utility model relates to the field of fake battery technology, and in particular to a fake battery circuit and electronic device. Background Technology

[0002] As the domestic electronics industry becomes increasingly industrialized, the requirements for functional testing equipment for PCBAs (Printed Circuit Board Assembly Units), a core component in the electronic product manufacturing process, are also increasing. Powering and charging the PCBA is an indispensable part of PCBA functional testing. PCBA testing equipment needs to provide power to the PCBA for testing other functions while also absorbing the current during reverse charging to test the PCBA's charging function.

[0003] However, existing technologies require separate current paths for PCBA charging and reverse charging, which is costly. There is a need to propose a solution that uses the same current path for both PCBA charging and reverse charging. Utility Model Content

[0004] The main purpose of this invention is to provide a dummy battery circuit, which aims to propose a scheme for PCBA charging and PCBA reverse charging using the same current channel.

[0005] To achieve the above objectives, the present invention proposes a dummy battery circuit, which includes: Voltage follower and power output module; The output terminal of the power output module is connected to the input terminal of the voltage follower, and the output terminal of the voltage follower is connected to the PCBA test equipment equipped with an energy storage structure. The power output module is used to output the power supply voltage to the PCBA test equipment for functional testing; The voltage follower is used to discharge the reverse output current when the energy storage structure outputs a reverse current.

[0006] This invention also proposes an electronic device, which includes the dummy battery circuit. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0008] Figure 1This is a schematic diagram of the structure of the first embodiment of the dummy battery circuit of this utility model; Figure 2 This is a schematic diagram of the first structure of the second embodiment of the dummy battery circuit of this utility model; Figure 3 This is a schematic diagram of the second structure of the second embodiment of the dummy battery circuit of this utility model; Figure 4 This is a schematic diagram of the first structure of the third embodiment of the dummy battery circuit of this utility model; Figure 5 This is a schematic diagram of the second structure of the third embodiment of the dummy battery circuit of this utility model; Figure 6 This is a schematic diagram of the first structure of the fourth embodiment of the dummy battery circuit of this utility model; Figure 7 This is a schematic diagram of the second structure of the fourth embodiment of the dummy battery circuit of this utility model.

[0009] Explanation of icon numbers: 10, Power output module; 20, Voltage follower; 110, Digital-to-analog converter circuit; 120, Power supply circuit; 130, Current detection module; 140, Voltage detection module; 150, Control module; 1410, Voltage detection circuit.

[0010] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0011] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0012] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0013] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0014] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0015] This invention proposes a dummy battery circuit, which aims to solve the problem in the prior art that it is necessary to provide separate current paths for charging and reverse charging.

[0016] In the first embodiment, the dummy battery circuit includes: a voltage follower 20 and a power output module 10; The output terminal of the power output module 10 is connected to the input terminal of the voltage follower 20, and the output terminal of the voltage follower 20 is connected to the PCBA test equipment equipped with an energy storage structure. The power output module 10 is used to output the power supply voltage to the PCBA test equipment for functional testing; The voltage follower 20 is used to discharge the reverse output current when the energy storage structure outputs a reverse current.

[0017] like Figure 1 As shown, the output terminal of the power output module 10 is connected to the input terminal of the voltage follower 20, and the output terminal of the voltage follower 20 is connected to the PCBA test equipment.

[0018] When providing power to the PCBA testing equipment, the voltage output by the power output module 10 is sent to the PCBA testing equipment via the voltage follower 20, thereby charging the PCBA testing equipment.

[0019] It should be noted that the voltage follower 20 can also be called a unity-gain amplifier, which is an amplifier circuit. The voltage follower 20 has the following key characteristics: low output impedance. Output impedance is the "impedance" of a circuit's output terminal to changes in current. Low output impedance means that the operational amplifier output terminal can flexibly respond to the current requirements of external PCBA test equipment, maintaining a stable output voltage whether it is providing current (power supply mode) or absorbing current flowing in from the outside (charging mode).

[0020] Compared to traditional solutions, ordinary power supplies or lithium batteries have higher output impedance. When an external device (such as a PCBA) reverse charges, the high output impedance can cause voltage fluctuations or prevent the effective acceptance of reverse current. Therefore, traditional solutions require separate current paths for PCBA charging and PCBA reverse charging. In this embodiment, a voltage follower 20 is placed between the power output module 10 and the PCBA testing equipment. The low output impedance of the operational amplifier can be considered as a "flexible current interface," allowing current to flow in both directions.

[0021] More specifically, the output stage of the operational amplifier in voltage follower 20 typically employs a push-pull power amplifier circuit (composed of complementary symmetrical transistors or field-effect transistors). This structure naturally possesses the characteristic of low output impedance. In a push-pull circuit, two complementary transistors are responsible for signal amplification during the positive and negative half-cycles, respectively. When the output current needs to increase, the corresponding transistor conducts, providing a low-impedance path; when the external circuit needs to absorb current in the reverse direction (i.e., current flows from the PCBA test equipment to the op-amp output), the reverse transistor conducts, similarly forming a low-impedance loop. When the external circuit (such as the PCBA test equipment) is in a reverse charging state, the output voltage of the PCBA test equipment will be higher than the op-amp's set output voltage, forming a reverse voltage difference. At this time, the reverse transistor in the op-amp output stage conducts. Due to the extremely low output impedance, the reverse voltage difference can drive current to flow smoothly into the op-amp (i.e., "absorb current"), without causing current blockage or abnormal voltage rise due to excessive impedance.

[0022] The reverse output current entering the voltage follower 20 will eventually flow to ground through the power supply loop and grounding system inside the voltage follower 20.

[0023] As can be seen from the above, this embodiment realizes PCBA charging and PCBA reverse charging using the same current channel through voltage follower 20.

[0024] It is easy to understand that the power output module 10 is the source of power for the PCBA testing equipment. For the PCBA testing equipment to output current in reverse, it needs an energy storage structure, such as an inductor or capacitor. Furthermore, the power output module 10 simulates the output voltage of a battery to achieve the function of a dummy battery circuit.

[0025] This invention proposes a dummy battery circuit and electronic device. The dummy battery circuit includes a voltage follower 20 and a power output module 10. The output terminal of the power output module 10 is connected to the input terminal of the voltage follower 20, and the output terminal of the voltage follower 20 is connected to a PCBA test device equipped with an energy storage structure. The power output module 10 is used to output a supply voltage to the PCBA test device for functional testing. The voltage follower 20 is used to discharge the reverse output current when the energy storage structure outputs a reverse current. This invention achieves both PCBA charging and reverse charging using the same current channel by outputting voltage through the voltage follower 20 and absorbing the reverse output current of the PCBA test device.

[0026] In the second embodiment, as Figure 2 As shown, the power output module 10 includes: a digital-to-analog converter circuit 110 and a power supply circuit 120; The output terminal of the power supply circuit 120 is connected to the power supply terminal of the digital-to-analog converter circuit 110 and the power supply terminal of the voltage follower 20, respectively; the output terminal of the digital-to-analog converter circuit 110 is connected to the input terminal of the voltage follower 20. The digital-to-analog converter circuit 110 is used to output the voltage value corresponding to the voltage command when a voltage command is received; The power supply circuit 120 is used to output the corresponding power supply voltage to the digital-to-analog converter circuit 110 and the voltage follower 20 respectively.

[0027] It should be noted that the voltage follower 20 requires an external power supply to operate normally. Additionally, the digital-to-analog converter 110 converts the received digital voltage command into a corresponding analog voltage value and outputs it to the input terminal of the voltage follower 20. The power supply circuit 120 provides corresponding operating voltages to both the digital-to-analog converter 110 and the voltage follower 20. Specifically, the first output terminal of the power supply circuit 120 is connected to the power supply terminal of the digital-to-analog converter 110, and the second output terminal of the power supply circuit 120 is connected to the power supply terminal of the voltage follower 20.

[0028] The digital-to-analog converter circuit 110 allows input of digital voltage commands and outputs the voltage value corresponding to the voltage command.

[0029] This embodiment provides a power output module 10 structure that allows for the simulation of battery output by sending digital voltage commands to the digital-to-analog converter circuit 110. Since the digital voltage commands can be provided by a digital controller, this provides a better simulation of battery output compared to directly outputting analog voltage to the voltage follower 20. Furthermore, since most controllers currently in use are digital, the digital-to-analog converter circuit 110 can be directly connected to the controller, allowing for adjustment of the output circuit under the controller's control; thus providing a digitally adjustable current path.

[0030] The digital-to-analog converter circuit 110 may include a digital-to-analog converter chip. In particular, the digital-to-analog converter chip may be an AD5663.

[0031] In one example, such as Figure 3 As shown, there are multiple voltage followers 20; the number of digital-to-analog converters 110 is the same as the number of voltage followers 20. The voltage followers 20 are connected one-to-one with the digital-to-analog converters 110.

[0032] It is readily understood that the digital-to-analog converter circuit 110 can achieve adjustable output voltage under the action of a voltage command. A digital-to-analog converter circuit 110 and a connected voltage follower 20 constitute a digitally adjustable voltage output channel. Specifically, the digital-to-analog converter circuit 110 provides an analog voltage value; the voltage follower 20 outputs the analog voltage value to the PCBA testing equipment and absorbs the reverse output current of the PCBA testing equipment.

[0033] When there are multiple voltage followers 20 and digital-to-analog converters 110, multiple digitally adjustable voltage output channels can be constructed. The input terminals of the multiple voltage followers 20 are connected one-to-one with the multiple digital-to-analog converters 110, and the output terminals of the multiple voltage followers 20 are connected to PCBA testing equipment, forming multiple digitally adjustable current channels to output multiple voltages to the PCBA testing equipment.

[0034] In the third embodiment, as Figure 4 As shown, the power output module 10 further includes: a control module 150, a current detection module 130, and a voltage detection module 140; The detection terminal of the current detection module 130 is connected to the output terminals of the multiple voltage followers 20, and the output terminals are connected to the control module 150. The detection terminal of the voltage detection module 140 is connected to the output terminals of the multiple voltage followers 20, and the output terminals are connected to the control module 150. The output terminal of the control module 150 is connected to the input terminal of the digital-to-analog converter circuit 110; The current detection current is used to detect the current value of the path between the multiple voltage followers 20 and the PCBA test equipment, and output it to the control module 150; The voltage detection module 140 is used to detect the voltage values ​​at the output terminals of the multiple voltage followers 20 and output them to the control module 150; the current value and the voltage value are used to adjust the output voltage of the voltage follower 20.

[0035] It should be noted that the dummy battery circuit has multiple digitally adjustable current channels. The control module 150 is connected to the input terminals of multiple digital-to-analog converter circuits 110 respectively, and is used to output corresponding voltage commands to adjust the analog output voltage value of each digital-to-analog converter circuit 110.

[0036] The current detection module 130 detects the current value of the path between the multiple voltage followers 20 and the PCBA testing equipment, and outputs it to the control module 150; the voltage detection module 140 detects the voltage value at the output terminal of the multiple voltage followers 20, and outputs it to the control module 150. After receiving the voltage value and current value at the output terminal of each voltage follower 20, the control module 150 outputs the corresponding voltage command to the corresponding digital-to-analog converter circuit 110.

[0037] In one example, the control module 150 includes multiple PID calculation circuits, and the current detection module 130 and the voltage detection module 140 are respectively connected to the multiple PID calculation circuits.

[0038] Taking a digitally adjustable current channel as an example, the same applies to other current channels. The voltage detection module 140 outputs the voltage value at the output terminal of the voltage follower 20 to the PID calculation circuit, and the current detection module 130 converts the current value at the output terminal of the same voltage follower 20 into a voltage value and outputs it to the PID calculation circuit. The PID calculation circuit includes a voltage loop and a current loop. The current loop output is connected in parallel with the voltage loop output through a diode. Under normal operation, the voltage loop dominates; under overload, the current loop outputs.

[0039] This allows the output voltage value of the voltage follower 20 in each current channel to be adjusted based on the voltage and current values ​​of each current channel. Specifically, the control module 150 changes the output voltage value of the corresponding voltage follower 20 by adjusting the voltage value corresponding to the voltage command output to each digital-to-analog converter.

[0040] Furthermore, this invention utilizes voltage followers 20 to achieve both PCBA charging and reverse charging within the same channel. The input terminal of the voltage detection module 140 is connected to the output terminals of multiple voltage followers 20. Therefore, the voltage detection module 140 can detect the voltage value at the output terminal of the voltage follower 20 when the PCBA testing device outputs a reverse charging current. Similarly, the current detection can detect the current value at the output terminal of the voltage follower 20 when the PCBA testing device outputs a reverse charging current.

[0041] In addition, the voltage detection module 140 can use a time-division multiplexing method to output multiple voltage values ​​at the output terminals of the voltage followers 20 to the control module 150; the current detection module 130 can use a time-division multiplexing method to output multiple current values ​​of the path between the voltage followers 20 and the PCBA test equipment to the control module 150.

[0042] In another example, such as Figure 5 As shown, the voltage detection module 140 includes: voltage detection circuits 1410 in the same number as the voltage follower 20; The input terminals of the voltage detection circuit 1410 are connected one-to-one with the output terminals of the plurality of voltage followers 20, and the output terminals are connected to the control module 150. The voltage detection circuit 1410 is used to detect the voltage value at the output terminal of the voltage follower 20 and output it to the control module 150.

[0043] It is easy to understand that multiple voltage followers 20 correspond to multiple current channels, and the voltages output to the PCBA testing equipment may differ between different current channels. The number of voltage detection circuits 1410 is the same as the number of voltage followers 20; therefore, the output terminal of each voltage follower 20 can be connected to one voltage detection circuit 1410. The multiple voltage detection circuits 1410 detect the voltage values ​​at the output terminals of the connected voltage followers 20 and output them to the control module 150 to assist in realizing the voltage output of multiple current channels.

[0044] Furthermore, in this example, the voltage values ​​output by the multiple voltage detection circuits 1410 to the control module 150 do not interfere with each other. Compared to the time-division multiplexing method of the voltage detection module 140, the timeliness of voltage data can be improved and the delay in information transmission to the control module 150 can be reduced.

[0045] In the fourth embodiment, as Figure 6 As shown, the current detection module 130 includes: a measuring resistor, an operational amplifier, and a switching device; The measuring resistor is positioned in the path between the output of the voltage follower 20 and the PCBA test equipment; the switching device is connected in parallel to the measuring resistor; the non-inverting input of the operational amplifier is connected to one end of the measuring resistor, the inverting input is connected to the other end of the measuring resistor, and the output is connected to the control module 150; the controlled end of the switching device is connected to the control module 150. The switching device is used to short-circuit the measuring resistor when it receives a conduction command output by the control module 150.

[0046] It should be noted that the measuring resistor is positioned between the output terminal of the voltage follower 20 and the PCBA testing equipment. The output current of the voltage follower 20 flows through the measuring resistor, and the reverse output current from the PCBA testing equipment also flows through the measuring resistor and into the voltage follower 20. Therefore, the measuring resistor can be used to measure the current value between the voltage follower 20 and the PCBA testing equipment. Specifically, the two ends of the measuring resistor are connected to the non-inverting input and the inverting input of the operational amplifier, respectively. The output terminal of the operational amplifier is connected to the control module 150, which amplifies the voltage across the measuring resistor and outputs it to the control module 150. It is easy to understand that the amplification factor of the operational amplifier can be determined by the R&D personnel.

[0047] The switching device is connected in parallel with the measuring resistor. When the switching device is turned on, the measuring resistor is short-circuited. It should be noted that the specifications of the measuring resistor affect the accuracy of the current measurement. Specifically, the measuring resistor value affects the voltage across the measuring resistor. The basic principle of current measurement is to convert the current signal into a voltage signal through a sampling resistor, and then indirectly obtain the current value by measuring the voltage through an operational amplifier. Under the same current, the larger the resistance, the higher the voltage across the measuring resistor. If the minimum resolution voltage of the operational amplifier and the subsequent ADC is fixed (e.g., 1mV), a larger resistance value can correspond to a smaller current change that can be resolved.

[0048] Shorting the measuring resistor using a switching device allows for replacement of the measuring resistor during the short circuit without affecting the normal operation of the current path. Different current measurement accuracies can be achieved using measuring resistors with varying resistance values. The switching device can be a MOSFET, transistor, or thyristor, etc.

[0049] In one example, such as Figure 7 As shown, there are multiple measuring resistors and multiple switching devices, and the multiple measuring resistors and multiple switching devices are connected in a one-to-one correspondence; the values ​​of the multiple measuring resistors are different.

[0050] It should be noted that the current detection module 130 includes multiple measuring resistors and the same number of switching devices. The multiple measuring resistors are connected in series between the voltage follower 20 and the PCBA testing equipment.

[0051] It should be noted that at least two measuring resistors are provided in the current path between each voltage follower 20 and the PCBA test equipment. Figure 7 In this configuration, each voltage follower 20 has three measuring resistors between it and the PCBA test equipment; and Figure 7 The diagram illustrates the connection relationship between the measured resistance, switching devices, and control module 150 within one current path. The same logic applies to the other current paths. Figure 7 The text has been omitted.

[0052] Taking a digitally adjustable current channel as an example, the same applies to other current channels. Multiple measuring resistors are connected in series in the current channel, each with a switching device connected in parallel. The controlled terminal of each switching device is connected to the control module 150; the multiple measuring resistors have different resistance values. As mentioned earlier, the current measurement accuracy varies depending on the measuring resistor. The control module 150 can selectively stop outputting a conduction command to the switching device corresponding to a measuring resistor with a specific resistance value, while outputting a conduction command to other switching devices; thus, only the voltage across the measuring resistor with that specific resistance value is output to the operational amplifier. The operational amplifier amplifies the voltage across the resistor and outputs it to the control module 150.

[0053] In this example, the two ends of multiple measuring resistors are connected to the non-inverting and inverting inputs of the operational amplifier, respectively. For signal quality considerations, only the voltage across one measuring resistor can be output to the operational amplifier at any given time. This example uses multiple measuring resistors, allowing the current measurement accuracy of the current measurement unit to be changed by selectively not shorting a specific measuring resistor without replacing it.

[0054] In another example, the current detection unit further includes: a selection conduction unit; The two ends of the plurality of measuring resistors are connected to the same number of input terminals of the selection conduction unit; the first output terminal of the selection conduction unit is connected to the non-inverting input terminal of the operational amplifier, the second output terminal is connected to the inverting input terminal of the operational amplifier, and the controlled terminal is connected to the control module 150. The selected conduction circuit is used to conduct the path between the operational amplifier and the corresponding measuring resistor when the selected conduction command is received from the control module 150.

[0055] It should be noted that in the previous example, changing the current measurement accuracy of the current measurement unit required shorting all measuring resistors except for the specific measuring resistor. This example uses a selection conduction circuit to select and conduct the path between the corresponding measuring resistor and the operational amplifier based on the received selection conduction command; this allows changing the current measurement accuracy of the current measurement unit without shorting the measuring resistors.

[0056] Specifically, the number of input terminals of the selection conduction unit is greater than or equal to the number of the plurality of measuring resistors. The two ends of the plurality of measuring resistors are connected to the same number of input terminals of the selection conduction unit; the first output terminal of the selection conduction unit is connected to the non-inverting input terminal of the operational amplifier, the second output terminal is connected to the inverting input terminal of the operational amplifier, and the controlled terminal is connected to the control module 150.

[0057] The selective conduction unit may include a multiplexer switch. Alternatively, a switch may be installed within the input terminal of the selective conduction unit, and upon receiving the selective conduction command, the selective conduction circuit will only activate the switch within the input terminal connected to the corresponding measuring resistor, while deactivating other switches; thus achieving selective conduction.

[0058] This invention also proposes an electronic device, which includes the dummy battery circuit.

[0059] The electronic device can be a digitally adjustable dummy battery power supply.

[0060] In addition, the electronic device also includes: a heat sink; The heat sink is in contact with the surface of the voltage follower 20 within the dummy battery circuit.

[0061] It should be noted that the voltage follower 20 generates heat regardless of whether it outputs current or discharges the reverse output current of the PCBA test equipment. To prevent the voltage follower 20 from overheating, a heat sink can be installed on the surface of the voltage follower 20 for heat dissipation, or forced air cooling or water cooling can be used for the voltage follower 20.

[0062] The specific structure of the dummy battery circuit is as described in the above embodiments. Since this electronic device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0063] The above description is only an optional embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A pseudo-battery circuit, characterized in that, The dummy battery circuit includes: Voltage follower and power output module; The output terminal of the power output module is connected to the input terminal of the voltage follower, and the output terminal of the voltage follower is connected to the PCBA test equipment equipped with an energy storage structure. The power output module is used to output the power supply voltage to the PCBA test equipment for functional testing; The voltage follower is used to discharge the reverse output current when the energy storage structure outputs a reverse current.

2. The dummy battery circuit as described in claim 1, characterized in that, The power output module includes: a digital-to-analog conversion circuit and a power supply circuit; The output terminal of the power supply circuit is connected to the power supply terminal of the digital-to-analog converter circuit and the power supply terminal of the voltage follower, respectively; the output terminal of the digital-to-analog converter circuit is connected to the input terminal of the voltage follower. The digital-to-analog converter circuit is used to output the voltage value corresponding to the voltage command when a voltage command is received. The power supply circuit is used to output the corresponding power supply voltage to the digital-to-analog converter circuit and the voltage follower, respectively.

3. The dummy battery circuit as described in claim 2, characterized in that, The number of voltage followers is multiple; the number of digital-to-analog converters is the same as the number of voltage followers; Each of the voltage followers is connected to one of the digital-to-analog converter circuits.

4. The dummy battery circuit as described in claim 3, characterized in that, The power output module also includes: a control module, a current detection module, and a voltage detection module; The detection terminal of the current detection module is connected to the output terminals of multiple voltage followers, and the output terminals are connected to the control module. The detection terminal of the voltage detection module is connected to the output terminals of multiple voltage followers, and the output terminals are connected to the control module. The output terminal of the control module is connected to the input terminal of the digital-to-analog converter circuit; The current detection current is used to detect the current value of the path between the multiple voltage followers and the PCBA test equipment, and output it to the control module; The voltage detection module is used to detect the voltage values ​​at the output terminals of the multiple voltage followers and output them to the control module; the current value and the voltage value are used to adjust the output voltage of the voltage followers.

5. The dummy battery circuit as described in claim 4, characterized in that, The voltage detection module includes: a voltage detection circuit with the same number as the voltage follower; The input terminals of the voltage detection circuit are connected one-to-one with the output terminals of the plurality of voltage followers, and the output terminals are connected to the control module. The voltage detection circuit is used to detect the voltage value at the output terminal of the voltage follower and output it to the control module.

6. The dummy battery circuit as described in claim 4, characterized in that, The current detection module includes: a measuring resistor, an operational amplifier, and a switching device; The measuring resistor is positioned in the path between the output of the voltage follower and the PCBA test equipment; the switching device is connected in parallel to the measuring resistor; the non-inverting input of the operational amplifier is connected to one end of the measuring resistor, the inverting input is connected to the other end of the measuring resistor, and the output is connected to the control module; the controlled terminal of the switching device is connected to the control module. The switching device is used to short-circuit the measuring resistor when it receives a conduction command output by the control module.

7. The dummy battery circuit as described in claim 6, characterized in that, The number of measuring resistors and the number of switching devices are multiple, and the multiple measuring resistors and the multiple switching devices are connected in a one-to-one correspondence; the values ​​of the multiple measuring resistors are different.

8. The dummy battery circuit as described in claim 7, characterized in that, The current detection unit further includes: a selection conduction unit; The two ends of the plurality of measuring resistors are connected to the same number of input terminals of the selection and conduction unit; the first output terminal of the selection and conduction unit is connected to the non-inverting input terminal of the operational amplifier, the second output terminal is connected to the inverting input terminal of the operational amplifier, and the controlled terminal is connected to the control module. The selected conduction circuit is used to conduct the path between the operational amplifier and the corresponding measuring resistor when the selected conduction command of the control module is received.

9. An electronic device, characterized in that, The electronic device includes a dummy battery circuit as described in any one of claims 1 to 8.

10. The electronic device as claimed in claim 9, characterized in that, The electronic device further includes: a heat sink; The heat sink is in contact with the surface of the voltage follower located within the dummy battery circuit.

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