Power supply base plate protection device, power supply base plate and hydrogen energy tester

Abstract

The invention relates to a power supply base plate protection device, a power supply base plate and a hydrogen energy tester, and relates to the technical field of electronic circuits. The power supply base plate protection device comprises an emergency stop circuit, a controller, a switching circuit and a switching circuit. The hardware emergency stop circuit is used for generating a first emergency stop signal according to an external key instruction. The controller is used for generating a switching signal and a second emergency stop signal according to the control instruction. And the switching circuit is connected with the hardware sudden stop circuit and the controller and is used for taking one of the first sudden stop signal and the second sudden stop signal as a driving signal according to the switching signal. The switching circuit is connected with the switching circuit and used for controlling the power supply loop to be connected or disconnected according to the driving signal. Therefore, the on-off control of the power supply loop on the power supply base plate is more flexible through hardware control and software control, the independent control of the power supply base plate is realized, and the effect of carrying out targeted protection on the power supply base plate and the load function module connected with the power supply base plate is realized.

Description

Technical Field

[0001] The present application relates to the field of electronic circuit technology, and in particular to a power supply baseboard protection device, a power supply baseboard and a hydrogen energy tester. Background Art

[0002] In precision testing equipment such as hydrogen energy testers, it is necessary to connect a variety of functional boards through an auxiliary power supply baseboard, such as DC motor power board, thyristor drive board, solenoid valve drive board, and signal acquisition card for monitoring temperature, flow and liquid level. The power supply of the above boards must be obtained from the main power supply end of the power supply baseboard.

[0003] At present, power conversion devices such as AC-DC converters or DC converters are usually used to provide energy to the total power supply end of the power supply baseboard. The power conversion devices generally have multiple protection functions such as overcurrent and overvoltage protection. That is, when the rear-end load connected to the power conversion device has abnormalities such as overcurrent and overvoltage, it will cause the working state of the power conversion device to be abnormal and power off. Relying on the protection function of the power conversion device, the power supply of the power conversion device can be cut off when the power supply baseboard has an abnormality, thereby protecting the power supply baseboard to a certain extent.

[0004] However, the power conversion device may also need to supply power to other devices besides the power supply baseboard. On the one hand, if the power conversion device is directly cut off, the whole device will be powered off. On the other hand, the current and voltage fluctuations caused by the power supply baseboard need to reach a certain value before triggering the power conversion device to be powered off. There may be a problem that the power supply baseboard is not powered off in time, resulting in the power supply baseboard and all the load function modules connected to it being burned and damaged. Therefore, how to carry out targeted protection for the power supply baseboard and the load function modules connected to it is a problem that needs to be solved urgently. Summary of the invention

[0005] The embodiment of the present application provides a power supply baseboard protection device, which provides targeted protection for the power supply baseboard and the load functional modules connected thereto, so as to at least partially solve the above-mentioned technical problems.

[0006] In order to achieve the above object, according to a first aspect of the present application, a power supply baseboard protection device is provided, comprising:

[0007] A hardware emergency stop circuit, used for generating a first emergency stop signal according to an external button instruction;

[0008] A controller, used for generating a switching signal and a second emergency stop signal according to a control instruction;

[0009] A switching circuit, connected to the hardware emergency stop circuit and the controller, for using one of the first emergency stop signal and the second emergency stop signal as a driving signal according to the switching signal;

[0010] The switch circuit is connected to the switching circuit and is used to control the power supply circuit to be turned on or off according to the driving signal.

[0011] Optionally, the hardware emergency stop circuit includes a trigger button, a first switch tube and a first photoelectric coupler;

[0012] The trigger button is used to receive external button instructions;

[0013] The first switch tube includes a control electrode connected to the trigger button, a first electrode connected to the first photoelectric coupler, and a grounded second electrode;

[0014] The first photocoupler includes an anode connected to a first voltage source, a cathode connected to a first electrode of the first switch tube, a collector connected to a second voltage source, and an emitter connected to the switching circuit.

[0015] Optionally, the switching circuit includes a relay;

[0016] The relay includes a coil end connected to the controller to receive the switching signal, a moving contact end connected to the switch circuit, a first static contact end connected to the hardware emergency stop circuit to receive the first emergency stop signal, and a second static contact end connected to the controller to receive the second emergency stop signal.

[0017] Optionally, the switch circuit includes a second switch tube, a second photocoupler, and a switch control subcircuit connected in series to the power supply loop;

[0018] The second switch tube includes a controller connected to the switching circuit, a first electrode connected to the second photoelectric coupler, and a grounded second electrode;

[0019] The second photocoupler includes an anode connected to a second voltage source, a cathode connected to a first electrode of the second switch tube, a collector connected to the switch control subcircuit and an emitter connected to a negative connection terminal of the power supply circuit.

[0020] Optionally, the control instruction includes a reverse connection control instruction, and the power supply baseboard protection device further includes an anti-reverse connection circuit;

[0021] The anti-reverse connection circuit is connected to the positive connection end of the power supply circuit and is used to sample the input voltage of the power supply circuit to obtain a reverse connection sampling voltage;

[0022] The controller is connected to the anti-reverse connection circuit and is used to generate a reverse connection detection result according to the reverse connection sampling voltage, and to generate the reverse connection control instruction when the reverse connection detection result is a power supply reverse connection, so as to control the power supply circuit to be disconnected.

[0023] Optionally, the anti-reverse connection circuit includes a voltage sampling subcircuit and a first bias subcircuit connected in sequence;

[0024] The voltage sampling subcircuit includes a capacitor, a common-mode inductor, and a first operational amplifier;

[0025] The first input end of the common-mode inductor is connected to the first end of the capacitor, the second input end is connected to the second end of the capacitor, and the first output end and the second output end are connected to the first operational amplifier; the capacitor is connected in parallel with the power supply loop; the first input end of the first operational amplifier is connected to the first output end of the common-mode inductor, the second input end is connected to the second output end of the common-mode inductor, and the output end is connected to the first bias sub-circuit;

[0026] The first bias subcircuit includes a first resistor and a second resistor;

[0027] The first end of the first resistor is connected to the voltage sampling subcircuit, and the second end is connected to the first end of the second resistor and the controller; the second end of the second resistor is connected to a reference voltage source.

[0028] Optionally, the control instruction includes a monitoring control instruction, and the power supply baseboard protection device further includes a monitoring circuit;

[0029] The monitoring circuit is connected to the negative connection terminal of the power supply circuit and is used to sample the power supply circuit to obtain a sampled current value;

[0030] The controller is connected to the monitoring circuit and is used to generate a monitoring result according to the sampled current value, and to generate the monitoring control instruction when the monitoring result is that the current is abnormal, so as to control the power supply circuit to be disconnected.

[0031] Optionally, the monitoring circuit includes a current sampling subcircuit and a second biasing subcircuit connected in sequence;

[0032] The current sampling subcircuit includes a current transformer, a second operational amplifier and at least one third resistor;

[0033] The current transformer comprises an input side connected to the negative connection terminal and an output side connected to the first end of the third resistor and the second operational amplifier; the second end of the third resistor is grounded; the second operational amplifier comprises a first input terminal connected to the output side of the current transformer, a second input terminal connected to the second bias subcircuit, and an output terminal;

[0034] The second bias subcircuit includes a fourth resistor and a fifth resistor;

[0035] The first end of the fourth resistor is connected to the current sampling subcircuit, and the second end is connected to the first end of the fifth resistor and the controller; the second end of the fifth resistor is connected to a reference voltage source.

[0036] According to a second aspect of the present application, there is provided a power supply base plate, comprising a power supply circuit, a plurality of power supply terminals and the power supply base plate protection device as described above;

[0037] The power supply circuit includes a power supply input terminal and a power supply output terminal;

[0038] The power supply bottom plate protection device is connected in series between the power supply input terminal and the power supply output terminal, and is used to control the conduction or disconnection of the power supply circuit;

[0039] The power supply output end is connected to each of the power supply terminals respectively to provide energy to the power supply terminals, so that the power supply terminals supply power to the load modules connected thereto.

[0040] According to a third aspect of the present application, a hydrogen energy tester is provided, comprising the power supply base plate as described above.

[0041] In the power supply base protection device of the embodiment of the present application, first, the hardware emergency stop circuit can generate the first emergency stop signal according to the instruction of the external button, so as to perform emergency stop control with human intervention when an abnormal situation occurs. Secondly, the controller can not only generate the second emergency stop signal according to the control instruction, so as to realize the emergency stop control of the software, but also generate a switching signal, and output the switching signal to the switching circuit, so that the switching circuit selects one of the first emergency stop signal and the second emergency stop signal as the driving signal, so as to avoid the situation of control conflict between the first emergency stop signal and the second emergency stop signal. Then, the driving signal is output to the switching circuit, so that the switching circuit controls the conduction or disconnection of the power supply circuit. In this way, the on-off control of the power supply circuit on the power supply base is more flexible through hardware control and software control, and the separate control of the power supply base is realized, thereby realizing the effect of targeted protection of the power supply base and the load function module connected to it.

[0042] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0044] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same figure numbers represent the same parts in the following description.

[0045] Figure 1 is a schematic diagram of an application scenario of a power supply bottom plate protection device provided in an exemplary embodiment of the present disclosure;

[0046] Figure 2 is a block diagram of a power supply bottom plate protection device provided in an exemplary embodiment of the present disclosure;

[0047] Figure 3 is a circuit connection structure diagram of a power supply bottom plate protection device provided in an exemplary embodiment of the present disclosure;

[0048] Figure 4 is a block diagram of another power supply bottom plate protection device provided in an exemplary embodiment of the present disclosure;

[0049] Figure 5 is a connection structure diagram of an anti-reverse connection circuit provided in an exemplary embodiment of the present disclosure;

[0050] Figure 6 is a connection structure diagram of a monitoring circuit provided in an exemplary embodiment of the present disclosure.

[0051] Explanation of the accompanying drawings: 1. Hardware emergency stop circuit; 2. Controller; 3. Switching circuit; 4. Switch circuit; 41. Switch control subcircuit; 5. Anti-reverse connection circuit; 51. Voltage sampling subcircuit; 52. First bias subcircuit; 6. Monitoring circuit; 61. Current sampling subcircuit; 62. Second bias subcircuit. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0053] First, based on the content of the background technology of the present application, the application scenario of the present application is further explained. Figure 1The power supply baseboard protection device is arranged on the power supply baseboard and connected to the power supply circuit. The power supply baseboard is also provided with a plurality of power supply terminals, including power supply terminal 1 to power supply terminal n. The power supply terminals are used to connect the load function modules. The power supply provides energy to each power supply terminal through the power supply circuit on the power supply baseboard, so that the power supply terminal supplies power to one or more load function modules connected thereto. The power supply baseboard protection device is connected to the power supply circuit to timely cut off the power supply circuit when the power supply circuit is abnormal, so that all power supply terminals are powered off to stop supplying power to the load function modules connected to the power supply terminals, thereby realizing the protection of the power supply baseboard and the load function modules connected thereto without affecting the power supply of the power supply to other devices. The technical solution of the present application is proposed without achieving the above-mentioned effect.

[0054] According to the first aspect of the present application, referring to Figure 2 The present disclosure provides a power supply baseboard protection device, including a hardware emergency stop circuit 1, a controller 2, a switching circuit 3 and a switch circuit 4. Among them, the hardware emergency stop circuit 1 is used to generate a first emergency stop signal according to an external button instruction. The controller 2 is used to generate a switching signal and a second emergency stop signal according to a control instruction. The switching circuit 3 is connected to the hardware emergency stop circuit 1 and the controller 2, and is used to use one of the first emergency stop signal and the second emergency stop signal as a driving signal according to the switching signal. The switch circuit 4 is connected to the switching circuit 3, and is used to control the power supply circuit to be turned on or off according to the driving signal.

[0055] As an example, the control instructions can be generated by the controller 2, and the control instructions include reverse connection control instructions, monitoring control instructions and remote control instructions. The reverse connection control instruction can be generated when the controller 2 detects that the power supply is reversely connected, and is used to avoid damage to the power supply baseboard caused by the reverse connection of the power supply. The monitoring control instruction can be generated when the monitoring data of the controller 2 is abnormal, and is used to avoid damage to the power supply baseboard caused by abnormalities such as voltage and current in the power supply circuit. The remote control instruction can be sent to the controller 2 by the communication module, and the communication module is connected to the terminal device so that the power supply circuit can be remotely controlled to be turned on and off through the terminal device.

[0056] As an example, taking the high-level valid switch circuit 4 as an example, when the power supply baseboard is working normally, the switching signal can be in a low-level state, so that the switching circuit 3 uses the first emergency stop signal as the driving signal according to the low-level switching signal. When the hardware emergency stop needs to be triggered, the hardware emergency stop button generates the first emergency stop signal in the low-level state through an external button instruction, so that the driving signal is in a low-level state to control the switch circuit 4 to disconnect, thereby realizing the hardware emergency stop control. When the software emergency stop needs to be triggered, the controller 2 first generates the second emergency stop signal in the low-level state, and then the controller 2 generates a high-level switching signal, so that the switching circuit 3 uses the second emergency stop signal as the driving signal according to the high-level switching signal, thereby making the driving signal in a low-level state to control the switch circuit 4 to disconnect, thereby realizing the software emergency stop control. Combined with Figure 1 , SW1 represents the first emergency stop signal; SW2 represents the second emergency stop signal; CH represents the switching signal.

[0057] In the above-mentioned implementation, firstly, the hardware emergency stop circuit 1 can generate the first emergency stop signal according to the instruction of the external button, so as to perform emergency stop control with human intervention when an abnormal situation occurs. Secondly, the controller 2 can not only generate the second emergency stop signal according to the control instruction, so as to realize the emergency stop control of the software, but also generate a switching signal, and output the switching signal to the switching circuit 3, so that the switching circuit 3 selects one of the first emergency stop signal and the second emergency stop signal as the driving signal, so as to avoid the control conflict between the first emergency stop signal and the second emergency stop signal. Then, the driving signal is output to the switch circuit 4, so that the switch circuit 4 controls the conduction or disconnection of the power supply circuit. In this way, the on-off control of the power supply circuit on the power supply base plate is more flexible through hardware control and software control, and the separate control of the power supply base plate is realized, thereby realizing the effect of targeted protection of the power supply base plate and the load functional module connected thereto.

[0058] Reference Figure 3 As an implementation of the hardware emergency stop circuit 1, the hardware emergency stop circuit 1 includes a trigger button P6, a first switch tube Q1 and a first photocoupler U1. The trigger button P6 is used to receive external button instructions. The first switch tube Q1 includes a control electrode connected to the trigger button P6, a first electrode connected to the first photocoupler U1, and a second electrode connected to ground. The first photocoupler U1 includes an anode connected to a first voltage source, a cathode connected to a first electrode of the first switch tube Q1, a collector connected to a second voltage source, and an emitter connected to the switching circuit 3.

[0059] As an example, the trigger button P6 can be a normally closed button. When the trigger button P6 is not pressed, the trigger button P6 remains closed, so as to connect the voltage signal to the control electrode of the first switch tube Q1 through the trigger button P6, so that the first switch tube Q1 remains turned on, thereby enabling the first photocoupler U1 to transmit the voltage signal output by the first voltage source to the switching circuit 3, that is, output the first emergency stop signal in a high level state to the switching circuit 3, thereby controlling the switch circuit 4 to be turned on, and the power supply baseboard operates normally.

[0060] In some embodiments, the emitter of the first photocoupler U1 can also be connected to the controller 2 to receive a first emergency stop signal. The controller 2 determines whether the trigger button P6 is pressed by the state of the first emergency stop signal. When the trigger button P6 is detected to be pressed, the controller 2 can control the device that needs to be shut down to be shut down in time.

[0061] In the above embodiment, when the trigger button P6 is pressed, the trigger button P6 is disconnected, and the control electrode of the first switch tube Q1 cannot be connected to the voltage signal, that is, the control electrode of the first switch tube Q1 is in a low level state, so that the first switch tube Q1 is disconnected, and the cathode of the first photocoupler U1 cannot be grounded and turned on, so that the voltage signal output by the first voltage source cannot be transmitted to the switching circuit 3, that is, the switching circuit 3 outputs the first emergency stop signal in a low level state to control the switch circuit 4 to disconnect, thereby achieving the effect of triggering the power supply baseboard to cut off the power through the hardware trigger button P6.

[0062] Reference Figure 3 As an implementation of the switching circuit 3, the switching circuit 3 includes a relay K1. The relay K1 includes a coil end connected to the controller 2 to receive a switching signal, a moving contact end connected to the switch circuit 4, a first static contact end connected to the hardware emergency stop circuit 1 to receive a first emergency stop signal, and a second static contact end connected to the controller 2 to receive a second emergency stop signal.

[0063] As an example, the coil end includes a positive terminal and a negative terminal, the controller 2 is connected to the negative terminal of the coil end, and the positive terminal of the coil end is connected to a first voltage source. When the controller 2 outputs a switching signal in a low-level state, the potential of the positive terminal is higher than the negative terminal, so that the coil in the relay K1 is turned on. At this time, the first static contact and the moving contact end of the relay K1 are closed, so that the hardware emergency stop circuit 1 is connected to the switch circuit 4, and the switching circuit 3 outputs the first emergency stop signal output by the hardware emergency stop circuit 1 as a drive signal to the switch circuit 4. When the controller 2 outputs a switching signal in a high-level state, the potential of the positive terminal is lower than the negative terminal, so that the coil in the relay K1 is not turned on. At this time, the second static contact and the moving contact end of the relay K1 are closed, so that the controller 2 is connected to the switch circuit 4, and the switching circuit 3 outputs the second emergency stop signal output by the controller 2 as a drive signal to the switch circuit 4.

[0064] In the above embodiment, the coil end of the relay K1 is connected to the controller 2, receives the switching signal from the controller 2, and outputs the first emergency stop signal or the second emergency stop signal as a driving signal to the switch circuit 4 through the switching signal to control the on and off of the power supply circuit, thereby achieving the first emergency stop signal and the second emergency stop signal. There is no conflict, thereby achieving a more flexible effect of on-off control of the power supply circuit through hardware control and software control.

[0065] Reference Figure 3 As an implementation of the switch circuit 4, the switch circuit 4 includes a second switch tube Q2, a second photocoupler U2, and a switch control subcircuit 41 connected in series to the power supply circuit. Among them, the second switch tube Q2 includes a controller 2 connected to the switching circuit 3, a first electrode connected to the second photocoupler U2, and a grounded second electrode. The second photocoupler U2 includes an anode connected to the second voltage source, a cathode connected to the first electrode of the second switch tube Q2, a collector connected to the switch control subcircuit 41, and an emitter connected to the negative connection end of the power supply circuit.

[0066] Combination Figure 3 As an example, the power supply circuit includes a power supply input terminal and a power supply output terminal, the power supply input terminal includes a positive connection terminal MP1 and a negative connection terminal MP2, the positive connection terminal MP1 and the negative connection terminal MP2 are respectively connected to the positive and negative poles of the power supply.

[0067] As an example, the switch control subcircuit 41 may include a number of P-type switch tubes connected in parallel, so that the switch control subcircuit 41 can support a large current to flow in a controllable manner. The number of P-type switch tubes can be set according to the size of the current to be controlled. If the current required to flow through the power supply circuit is larger, the number of P-type switch tubes in parallel can be larger. Taking the number of P-type switch tubes as two as an example, the switch control subcircuit 41 includes a third switch tube Q3 and a fourth switch tube Q4. The third switch tube Q3 and the fourth switch tube Q4 are connected in parallel and then connected in series to the power supply circuit. The control electrodes of the third switch tube Q3 and the fourth switch tube Q4 are simultaneously connected to the collector of the second photocoupler U2.

[0068] In the above embodiment, the second switch tube Q2 is connected to the switching circuit 3 to receive the drive signal. When the drive signal is in a high-level state, the second switch tube Q2 is turned on, and the cathode of the second photocoupler U2 is grounded to turn on the second photocoupler U2, so that the switch control subcircuit 41 is connected to the negative connection terminal, thereby turning on the switch control subcircuit 41 and the power supply circuit. When the drive signal is in a low-level state, the second switch tube Q2 is cut off, and the second photocoupler U2 is disconnected, so that the switch control subcircuit 41 cannot generate a bias voltage, thereby disconnecting the switch control subcircuit 41 and the power supply circuit is not turned on. In this way, the on-off control of the power supply circuit is realized through the switch circuit 4.

[0069] Reference Figure 4 As an implementation of the power supply base protection device, the control instruction includes a reverse connection control instruction, and the power supply base protection device also includes an anti-reverse connection circuit 5. The anti-reverse connection circuit 5 is connected to the positive connection end of the power supply circuit, and is used to sample the input voltage of the power supply circuit to obtain a reverse connection sampling voltage. The controller 2 is connected to the anti-reverse connection circuit 5, and is used to generate a reverse connection detection result according to the reverse connection sampling voltage, and generate a reverse connection control instruction when the reverse connection detection result is a reverse connection of the power supply, so as to control the power supply circuit to be disconnected.

[0070] As an example, the reverse connection detection result can be obtained by performing a threshold judgment on the reverse connection sampling voltage. For example, when the reverse connection sampling voltage belongs to a preset reverse connection voltage range, the reverse connection detection result is determined to be a power supply reverse connection; when the reverse connection sampling voltage does not belong to the preset reverse connection voltage range, the reverse connection detection result is determined to be a normal power supply connection.

[0071] Reference Figure 5 As an implementation of the anti-reverse connection circuit 5, the anti-reverse connection circuit 5 includes a voltage sampling subcircuit 51 and a first bias subcircuit 52 connected in sequence. Among them, the voltage sampling subcircuit 51 includes a capacitor C1, a common mode inductor L1 and a first operational amplifier U3. The first input end of the common mode inductor L1 is connected to the first end of the capacitor C1, the second input end is connected to the second end of the capacitor C1, and the first output end and the second output end are connected to the first operational amplifier U3. The capacitor C1 is connected in parallel with the power supply circuit. The first input end of the first operational amplifier U3 is connected to the first output end of the common mode inductor L1, the second input end is connected to the second output end of the common mode inductor L1, and the output end is connected to the first bias subcircuit 52.

[0072] As an example, a sixth resistor R6 may be further connected in series between the second input terminal and the output terminal of the first operational amplifier U3 , and the gain of the first operational amplifier U3 may be adjusted by the resistance value of the sixth resistor R6 .

[0073] The first bias subcircuit 52 includes a first resistor R1 and a second resistor R2. The first resistor R1 has a first end connected to the voltage sampling subcircuit 51, and a second end connected to a first end of the second resistor R2 and the controller 2. The second end of the second resistor R2 is connected to a reference voltage source.

[0074] In the above embodiment, the input voltage in the power supply circuit is transmitted to the common-mode inductor L1 through the capacitor C1, and the fluctuation of the input voltage in the power supply circuit can be smoothed through the capacitor C1. Then, the input voltage in the power supply circuit is common-mode filtered by the common-mode inductor L1 to suppress the common-mode interference of the input voltage of the power supply circuit, and then the input voltage after common-mode filtering is amplified by the first operational amplifier U3 to obtain the reverse sampling voltage. Finally, the reverse sampling voltage is biased by the voltage divider network composed of the first resistor R1 and the second resistor R2, and the reverse sampling voltage is adjusted to a range suitable for the controller 2 to read, and then the adjusted reverse sampling voltage is output to the controller 2, so that the controller 2 generates a reverse detection result, and generates a reverse control instruction when the reverse detection result is a power supply reverse connection, so as to control the power supply circuit to disconnect.

[0075] Reference Figure 4 As a further implementation of the power supply baseboard protection device, the control instruction includes a monitoring control instruction, and the power supply baseboard protection device also includes a monitoring circuit 6. The monitoring circuit 6 is connected to the negative connection terminal of the power supply circuit, and is used to sample the power supply circuit to obtain a sampled current value. The controller 2 is connected to the monitoring circuit 6, and is used to generate a monitoring result according to the sampled current value, and generate a monitoring control instruction when the monitoring result is that the current is abnormal, so as to control the power supply circuit to be disconnected.

[0076] As an example, the monitoring result can be obtained by performing a threshold judgment on the sampled current value. For example, when the sampled current value belongs to the preset current range, the monitoring result is determined to be normal current; when the sampled current value does not belong to the preset current range, the monitoring result is determined to be abnormal current.

[0077] Reference Figure 6 As an implementation of the monitoring circuit 6, the monitoring circuit 6 includes a current sampling subcircuit 61 and a second bias subcircuit 62 connected in sequence. Among them, the current sampling subcircuit 61 includes a current transformer, a second operational amplifier U4 and at least one third resistor R3. The current transformer includes an input side connected to the negative connection end and an output side connected to the first end of the third resistor R3 and the second operational amplifier U4. The second end of the third resistor R3 is grounded. The second operational amplifier U4 includes a first input end connected to the output side of the current transformer, a second input end connected to the second bias subcircuit 62, and an output end.

[0078] As an example, a seventh resistor R7 may be further connected in series between the second input terminal and the output terminal of the second operational amplifier U4, and the gain of the second operational amplifier U4 may be adjusted by the resistance value of the seventh resistor R7.

[0079] The second bias subcircuit 62 includes a fourth resistor R4 and a fifth resistor R5. The first end of the fourth resistor R4 is connected to the current sampling subcircuit 61, and the second end is connected to the first end of the fifth resistor R5 and the controller 2. The second end of the fifth resistor R5 is connected to the reference voltage source.

[0080] In the above implementation, the current in the power supply loop is obtained by the current transformer to obtain the loop current, the loop current is resistively amplified by the third resistor R3, and then amplified again by the second operational amplifier U4 to obtain the sampling current value. Then, the sampling current value is biased by the voltage divider network composed of the fourth resistor R4 and the fifth resistor R5, and the sampling current value is adjusted to a range suitable for the controller 2 to read, and then the adjusted sampling current value is output to the controller 2, so that the controller 2 generates a monitoring result, and generates a monitoring control instruction when the monitoring result is a current abnormality, so as to control the power supply loop to be disconnected.

[0081] It should be noted that the grounding described in this application is one of the analog ground AGND, the power ground PGND and the digital ground DGND. According to the second aspect of this application, a power supply base is provided, including a power supply circuit, a plurality of power supply terminals and the power supply base protection device as described above.

[0082] The power supply circuit includes a power supply input terminal and a power supply output terminal. The power supply bottom plate protection device is connected in series between the power supply input terminal and the power supply output terminal to control the conduction or disconnection of the power supply circuit. The power supply output terminal is respectively connected to each power supply terminal to provide energy to the power supply terminal so that the power supply terminal supplies power to the load module connected thereto.

[0083] According to a third aspect of the present application, a hydrogen energy tester is provided, comprising the power supply base plate as described above.

[0084] As an example, when the power supply baseboard is applied to a hydrogen energy tester, the several power supply terminals can be one or more combinations of a DC motor card connection terminal, a solenoid valve card connection terminal, a thyristor card connection terminal, a temperature acquisition card connection terminal, a conductivity acquisition card connection terminal, a liquid level acquisition card connection terminal, and a digital power supply connection terminal.

[0085] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0086] The above are only preferred embodiments of the present application and do not constitute any form of limitation to the present application. Although the descriptions of various embodiments in the embodiments of the present application have different focuses, for parts that are not described in detail in a certain embodiment, reference can be made to relevant parts of other embodiments. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A power supply bottom plate protection device, characterized in that: include: A hardware emergency stop circuit, used for generating a first emergency stop signal according to an external button instruction; A controller, used for generating a switching signal and a second emergency stop signal according to a control instruction; A switching circuit, connected to the hardware emergency stop circuit and the controller, for using one of the first emergency stop signal and the second emergency stop signal as a driving signal according to the switching signal; The switch circuit is connected to the switching circuit and is used to control the power supply circuit to be turned on or off according to the driving signal.

2. The power supply bottom plate protection device according to claim 1, characterized in that: The hardware emergency stop circuit includes a trigger button, a first switch tube and a first photoelectric coupler; The trigger button is used to receive external button instructions; The first switch tube includes a control electrode connected to the trigger button, a first electrode connected to the first photoelectric coupler, and a grounded second electrode; The first photocoupler includes an anode connected to a first voltage source, a cathode connected to a first electrode of the first switch tube, a collector connected to a second voltage source, and an emitter connected to the switching circuit.

3. The power supply bottom plate protection device according to claim 1, characterized in that: The switching circuit includes a relay; The relay includes a coil end connected to the controller to receive the switching signal, a moving contact end connected to the switch circuit, a first static contact end connected to the hardware emergency stop circuit to receive the first emergency stop signal, and a second static contact end connected to the controller to receive the second emergency stop signal.

4. The power supply bottom plate protection device according to claim 1, characterized in that: The switch circuit includes a second switch tube, a second photoelectric coupler, and a switch control subcircuit connected in series to the power supply loop; The second switch tube includes a controller connected to the switching circuit, a first electrode connected to the second photoelectric coupler, and a grounded second electrode; The second photocoupler includes an anode connected to a second voltage source, a cathode connected to a first electrode of the second switch tube, a collector connected to the switch control subcircuit and an emitter connected to a negative connection terminal of the power supply circuit.

5. The power supply bottom plate protection device according to any one of claims 1 to 4, characterized in that: The control instruction includes a reverse connection control instruction, and the power supply baseboard protection device also includes an anti-reverse connection circuit; The anti-reverse connection circuit is connected to the positive connection end of the power supply circuit and is used to sample the input voltage of the power supply circuit to obtain a reverse connection sampling voltage; The controller is connected to the anti-reverse connection circuit and is used to generate a reverse connection detection result according to the reverse connection sampling voltage, and to generate the reverse connection control instruction when the reverse connection detection result is a power supply reverse connection, so as to control the power supply circuit to be disconnected.

6. The power supply bottom plate protection device according to claim 5, characterized in that: The anti-reverse connection circuit comprises a voltage sampling subcircuit and a first bias subcircuit connected in sequence; The voltage sampling subcircuit includes a capacitor, a common-mode inductor, and a first operational amplifier; The first input end of the common mode inductor is connected to the first end of the capacitor, the second input end is connected to the second end of the capacitor, and the first output end and the second output end are connected to the first operational amplifier; the capacitor is connected in parallel with the power supply loop; The first operational amplifier has a first input terminal connected to the first output terminal of the common-mode inductor, a second input terminal connected to the second output terminal of the common-mode inductor, and an output terminal connected to the first bias subcircuit; The first bias subcircuit includes a first resistor and a second resistor; The first end of the first resistor is connected to the voltage sampling subcircuit, and the second end is connected to the first end of the second resistor and the controller; the second end of the second resistor is connected to a reference voltage source.

7. The power supply bottom plate protection device according to any one of claims 1 to 4, characterized in that: The control instructions include monitoring control instructions, and the power supply bottom plate protection device also includes a monitoring circuit; The monitoring circuit is connected to the negative connection terminal of the power supply circuit and is used to sample the power supply circuit to obtain a sampled current value; The controller is connected to the monitoring circuit and is used to generate a monitoring result according to the sampled current value, and to generate the monitoring control instruction when the monitoring result is that the current is abnormal, so as to control the power supply circuit to be disconnected.

8. The power supply bottom plate protection device according to claim 7, characterized in that: The monitoring circuit includes a current sampling subcircuit and a second biasing subcircuit connected in sequence; The current sampling subcircuit includes a current transformer, a second operational amplifier and at least one third resistor; The current transformer comprises an input side connected to the negative connection terminal and an output side connected to the first end of the third resistor and the second operational amplifier; the second end of the third resistor is grounded; the second operational amplifier comprises a first input terminal connected to the output side of the current transformer, a second input terminal connected to the second bias subcircuit, and an output terminal; The second bias subcircuit includes a fourth resistor and a fifth resistor; The first end of the fourth resistor is connected to the current sampling subcircuit, and the second end is connected to the first end of the fifth resistor and the controller; the second end of the fifth resistor is connected to a reference voltage source.

9. A power supply baseboard, characterized in that: It comprises a power supply circuit, a plurality of power supply terminals and a power supply bottom plate protection device as claimed in any one of claims 1 to 8; The power supply circuit includes a power supply input terminal and a power supply output terminal; The power supply bottom plate protection device is connected in series between the power supply input terminal and the power supply output terminal, and is used to control the conduction or disconnection of the power supply circuit; The power supply output end is connected to each of the power supply terminals respectively to provide energy to the power supply terminals, so that the power supply terminals supply power to the load modules connected thereto.

10. A hydrogen energy tester, characterized in that: It comprises the power supply base plate as claimed in claim 9.

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