Oscilloscope and power supply circuit of probe thereof

Abstract

The invention discloses an oscilloscope and a power supply circuit of a probe thereof. A power supply input interface in the power supply circuit is in circuit connection with a power supply interface through an alternating current-direct current conversion module. The AC-DC conversion module converts an AC power supply accessed by the power supply input interface into an initial DC power supply and supplies the initial DC power supply to the power supply interface circuit. The power supply interface circuit is integrated on the oscilloscope probe plate and comprises a direct current conversion circuit, a voltage stabilizing circuit and a power supply port. The input end of the DC conversion circuit is connected with the AC-DC conversion module, and the output end of the DC conversion circuit is connected with the power supply port through the voltage stabilizing circuit; the power supply port is externally connected with the active probe, power supply to the active probe is realized, voltage fluctuation during transient current change is controlled, stable voltage is ensured to be provided for the active probe, the power supply circuit is integrated on the oscilloscope probe plate, power supply voltage drop caused by circuit resistance can be reduced, and the reliability of the oscilloscope probe plate is improved. The power supply voltage is ensured to be closer to a set value, and the precision of the power supply voltage is improved.

Description

Technical Field

[0001] The invention relates to the field of detection equipment, and in particular to an oscilloscope and a power supply circuit of a probe thereof. Background Art

[0002] As a high-precision measuring instrument, an oscilloscope often needs to be used with an active probe for signal acquisition when high-bandwidth performance is required. In this case, the performance of the oscilloscope depends largely on the quality of the power supply.

[0003] In such Figure 1 In the traditional power supply scheme shown in the figure, the DC power after AC-DC conversion must first pass through the DC conversion module and voltage regulator module on the mainboard to convert the power to the voltage level required by the active probe. Then, it is transmitted to the active probe interface via a longer line and then provided to the active probe.

[0004] However, in this power supply solution, the long power supply path will lead to an increase in line loss, thereby greatly affecting the stability of the probe measurement results. Summary of the invention

[0005] The invention provides an oscilloscope and a power supply circuit of a probe thereof, so as to improve the performance stability of an active probe and enhance the safety of the power supply circuit.

[0006] According to one aspect of the present invention, a power supply circuit for an oscilloscope probe is provided, characterized in that it comprises: a power input interface, an AC / DC conversion module and a power supply interface circuit;

[0007] The power input interface is connected to the power supply interface circuit via the AC / DC conversion module, and the power input interface is used to access an AC power source;

[0008] The AC / DC conversion module is used to convert the AC power connected to the power input interface into an initial DC power supply and supply it to the power supply interface circuit;

[0009] The power supply interface circuit is integrated on the oscilloscope probe board. The power supply interface circuit includes a DC conversion circuit, a voltage stabilizing circuit and a power supply port. The power supply port is arranged on the front of the oscilloscope probe board, and the DC conversion circuit and the voltage stabilizing circuit are arranged on the back of the oscilloscope probe board. The input end of the DC conversion circuit is connected to the AC / DC conversion module; the output end of the DC conversion circuit is connected to the power supply port via the voltage stabilizing circuit; the power supply port is used to connect an external active probe to power the active probe.

[0010] Optionally, the power supply circuit of the oscilloscope probe further includes: a control module; the power supply interface circuit is also connected to the control module, and the control module is used to control the working mode of the power supply port according to a user's input signal.

[0011] Optionally, the working mode of the power supply port includes an automatic mode;

[0012] The power supply port includes an identity authentication pin, which is connected to the control module; the identity authentication pin is used to access the identity signal on the active probe externally connected to the power supply port;

[0013] The control module is used to control the power supply port to enter the automatic mode after receiving an input signal for starting the automatic mode; in the automatic mode, the working state of the power supply port is controlled by the control module;

[0014] The control module is also used to verify the identity signal uploaded by the authentication pin when the power supply port is in the automatic mode; according to the verification result, control the power supply port to remain in the power-off state or change from the power-off state to the enabled state.

[0015] Optionally, the operating mode of the power supply port includes a normally closed mode;

[0016] The control module is used to control the power supply port to enter the normally closed mode after receiving an input signal for starting the normally closed mode; in the normally closed mode, the power supply port remains in a power-off state.

[0017] Optionally, the operating mode of the power supply port includes a normally open mode;

[0018] The control module is used to control the power supply port to enter the normally-on mode after receiving an input signal for starting the normally-on mode; in the normally-on mode, the power supply port remains in an enabled state.

[0019] Optionally, the number of the power supply ports on the power supply interface circuit is greater than 1.

[0020] Optionally, the power supply circuit of the oscilloscope probe further includes an energy storage module, the energy storage module is connected to the power supply interface circuit, and the energy storage module is used to provide stored DC power for the power supply interface circuit.

[0021] Optionally, the energy storage module is also connected to the power input interface, and the energy storage module is also used to charge using the AC power supply.

[0022] Optionally, the voltage stabilization circuit includes a low voltage drop linear regulator

[0023] According to another aspect of the present invention, an oscilloscope is provided. The oscilloscope comprises the power supply circuit of any oscilloscope probe as described in the first aspect.

[0024] The embodiment of the present invention provides a power supply circuit for an oscilloscope and a probe thereof, wherein a power input interface in the power supply circuit is connected to a power supply interface circuit via an AC / DC conversion module. The AC / DC conversion module converts the AC power connected to the power input interface into an initial DC power supply and supplies the power supply interface circuit. A DC conversion circuit, a voltage stabilizing circuit and a power supply port are integrated on the power supply interface circuit, wherein the input end of the DC conversion circuit is connected to the AC / DC conversion module; the output end of the DC conversion circuit is connected to the power supply port via a voltage stabilizing circuit; and an active probe is externally connected to the power supply port. The power supply interface circuit is also connected to a control module, which controls the working mode of the power supply port according to the user's input signal, thereby realizing power supply to the active probe. On the one hand, the setting of the power supply interface circuit greatly shortens the transmission path of the electrical signal after DC conversion and voltage stabilization processing, so that the voltage fluctuation during transient current changes is controlled, thereby ensuring that a stable voltage is provided to the active probe. Moreover, the integrated power supply circuit on the oscilloscope probe board can reduce the supply voltage drop caused by the line's own resistance, thereby ensuring that the supply voltage is closer to the set value, thereby improving the accuracy of the supply voltage. On the other hand, by using the control module to adjust the working mode of the power supply port, the user can flexibly control the power supply status of each oscilloscope channel to achieve more refined channel management. It can also reduce the probability of short-circuit failure when the power supply circuit is not powered, thereby enhancing the safety of the power supply circuit.

[0025] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a circuit diagram of a power supply circuit of an oscilloscope probe in the prior art;

[0028] Figure 2 A schematic diagram of the composition of a power supply circuit of an oscilloscope probe provided by an embodiment of the present invention;

[0029] Figure 3A schematic diagram of a partial front surface of an oscilloscope probe board provided by an embodiment of the present invention;

[0030] Figure 4 A schematic diagram of another power supply circuit and its corresponding oscilloscope probe provided in an embodiment of the present invention;

[0031] Figure 5 A schematic diagram of another power supply circuit and its corresponding oscilloscope probe provided in an embodiment of the present invention;

[0032] Figure 6 A schematic diagram of a user page of an oscilloscope operating system provided by an embodiment of the present invention;

[0033] Figure 7 A schematic flow chart of a method for controlling a power supply circuit of an oscilloscope probe provided by an embodiment of the present invention;

[0034] Figure 8 A schematic flow chart of another method for controlling a power supply circuit of an oscilloscope probe provided by an embodiment of the present invention;

[0035] Fig. 9 A schematic flow chart of another method for controlling a power supply circuit of an oscilloscope probe provided by an embodiment of the present invention;

[0036] Fig.10 A circuit diagram of a power supply circuit of another oscilloscope probe provided by an embodiment of the present invention;

[0037] Fig.11 A schematic diagram of the composition of an oscilloscope provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0039] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0040] In order to solve the problem raised in the background technology, an embodiment of the present invention provides a power supply circuit for an oscilloscope probe. Figure 2 A schematic diagram of a power supply circuit of an oscilloscope probe provided in an embodiment of the present invention, referring to Figure 2 The power supply circuit 100 of the oscilloscope probe includes a power input interface 101, an AC / DC conversion module 102, a power supply interface circuit 103 and a control module 107. The power input interface 101 is connected to the power supply interface circuit 103 via the AC / DC conversion module 102, and the power input interface 101 is used to access the AC power supply. The AC / DC conversion module 102 is used to convert the AC power connected to the power input interface 101 into an initial DC power supply, and supply it to the power supply interface circuit 103. The power supply interface circuit 103 is integrated on the oscilloscope probe board, and the power supply interface circuit 103 includes a DC conversion circuit 104, a voltage stabilizing circuit 105 and a power supply port 106. The power supply port 106 is arranged on the front of the oscilloscope probe board, and the DC conversion circuit 104 and the voltage stabilizing circuit 105 are arranged on the back of the oscilloscope probe board. The input end of the DC conversion circuit 104 is connected to the AC / DC conversion module 102; the output end of the DC conversion circuit 104 is connected to the power supply port 106 via the voltage stabilizing circuit 105; the power supply port 106 is used to connect an external active probe to power the active probe. The power supply interface circuit 103 is provided with a metal contact x and / or a switch ( Figure 2 The metal contact x is exemplarily shown in the figure), the metal contact x and / or the switch are arranged between the voltage stabilizing circuit 105 and the power supply port 106, and are connected to the control module 107. The control module 107 is used to control the working mode of the power supply port 106 according to the user's input signal.

[0041] Specifically, the power input interface 101 is an AC power connection port in the power supply circuit 100 of the oscilloscope probe, which can connect the AC power supply for power supply to the power supply circuit and supply power to the subsequent circuit. Exemplarily, the power input interface 101 may include a three-pin jack or a two-pin jack. The AC-DC conversion module 102 is also called an AC-DC power supply module, which is an AC-DC conversion module 102 in the power supply circuit 100 of the oscilloscope probe. Its input end is connected to the power input interface 101, and its output end is connected to the power supply interface circuit 103. The AC-DC conversion module 102 can convert the AC power into a DC power of the corresponding voltage level. The power supply circuit 100 of the oscilloscope probe can share a set of power input interface 101 and AC-DC conversion module 102 with other devices in the oscilloscope. That is to say, in addition to supplying power to the power supply interface circuit 103 of the subsequent stage of the power supply circuit, the AC-DC conversion module 102 can also supply power to other DC electrical appliances in the oscilloscope.

[0042] The power supply interface circuit 103 refers to a circuit set having a DC conversion function, a voltage stabilization function, and a power supply interface. It is a power supply circuit that is independent of the oscilloscope mainboard and integrated on the oscilloscope probe board, and is directly connected to the AC-DC conversion module 102. The DC conversion circuit 104 on the power supply interface circuit 103 is also called a DC-DC circuit, and its input end is connected to the AC-DC conversion module 102. The DC conversion circuit 104 can convert the initial DC power provided by the AC-DC conversion module 102 into a DC voltage conversion into a preset voltage level required by the active probe. The preset voltage level may include multiple different levels, and the DC conversion circuit 104 may switch the preset voltage level according to the control signal of the control module 107 to adapt to probes with different requirements. Exemplarily, the preset voltage level may include ±5V.

[0043] The voltage stabilizing circuit 105 is a component circuit disposed between the output end of the DC conversion circuit 104 and the power supply port 106 for stabilizing the output voltage of the power supply port 106 , thereby ensuring the stability of the power output from the power supply port 106 .

[0044] The power supply port 106 refers to a port in the power supply interface circuit 103 that directly supplies power to the active probe, and corresponds to and matches the power supply interface on the active probe. Exemplarily, the power supply port 106 may include an automatic probe interface, also called an AutoProbe interface. Figure 3 A schematic diagram of a partial front surface of an oscilloscope probe board provided by an embodiment of the present invention, Figure 3 The power supply port, DC conversion circuit and voltage stabilization circuit integrated on the oscilloscope probe board are omitted. Figure 2 and Figure 3, the power supply port 106, the DC conversion circuit 104 and the voltage stabilizing circuit 105 are integrated on the same circuit board, which can be an oscilloscope probe board 108. Compared with the solution in the prior art, the present application sets the power supply port 106 on the front of the oscilloscope probe board 108, and the DC conversion circuit 104 and the voltage stabilizing circuit 105 on the back of the oscilloscope probe board 108. The front and back of the oscilloscope probe board 108 can be connected by metal contacts and through holes on the circuit board that connect the front and back sides to achieve circuit connection. Such a setting makes the DC power supply related circuits such as the DC conversion circuit 104 and the voltage stabilizing circuit 105 closer to the power supply port 106, thereby greatly reducing the length of the transmission path of the electrical signal after DC conversion and voltage stabilization processing, reducing the voltage drop and line loss of the final power supply during the transmission process, and thus improving the performance stability of the active probe.

[0045] The control module 107 refers to the control center of the power supply circuit, which can control the working mode of the power supply port 106 according to the user's input signal. Exemplarily, the control module 107 may include a control chip, a single-chip microcomputer or a microcomputer and other devices with data analysis and calculation functions, which are convenient for analyzing and processing the input signal and generating a corresponding control signal to switch the working mode of the power supply port 106, wherein the working mode may include normally open and normally closed, thereby realizing the start and stop control of the power supply to the probe. The control module 107 may also be provided with a signal input device such as a button, a knob or a switch for obtaining the user's input signal. The control module 107 may also include an oscilloscope operating system, which can realize the common operating system of the power supply circuit and the oscilloscope, and the oscilloscope operating system can provide a user interface for the power supply circuit, which is convenient for instructing the user to modify or type the input signal.

[0046] The power supply circuit of the oscilloscope probe provided in this embodiment is provided with a power input interface, an AC / DC conversion module, a power supply interface circuit and a control module. The power input interface is connected to the power supply interface circuit via the AC / DC conversion module for accessing an AC power supply. The AC / DC conversion module converts the AC power connected to the power input interface into an initial DC power supply and supplies it to the power supply interface circuit. The power supply interface circuit integrates a DC conversion circuit, a voltage stabilizing circuit and a power supply port. The input end of the DC conversion circuit is connected to the AC / DC conversion module; the output end of the DC conversion circuit is connected to the power supply port via the voltage stabilizing circuit; the power supply port is externally connected to an active probe to power the active probe. The power supply interface circuit is also connected to the control module. The control module controls the working mode of the power supply port according to the user's input signal, and realizes the power supply to the active probe. On the one hand, the setting of the power supply interface circuit greatly shortens the transmission path of the electrical signal after DC conversion and voltage stabilization processing, so that the voltage fluctuation during transient current changes is controlled, ensuring that a stable voltage is provided for the active probe. In addition, the integrated power supply circuit on the oscilloscope probe board can reduce the supply voltage drop caused by the line's own resistance, ensuring that the supply voltage is closer to the set value and improving the accuracy of the supply voltage. On the other hand, by using the control module to adjust the working mode of the power supply port, the user can flexibly control the power supply status of each oscilloscope channel, realize more sophisticated channel management, and reduce the probability of short circuit failure when the power supply circuit is not powered, thereby enhancing the safety of the power supply circuit.

[0047] Optionally, based on the above embodiment, continue to refer to Figure 2 The voltage stabilization circuit 105 includes a low-dropout linear regulator, which is also called an LDO circuit. The low-dropout linear regulator collects the output voltage through a sampling resistor, and the obtained sampled voltage is compared with the reference voltage provided by the reference voltage source in the error amplifier. The difference between the two is amplified by the error amplifier, and the voltage drop of the series adjustment tube is controlled, so that the output voltage is stabilized at the set value.

[0048] The power supply circuit of the oscilloscope probe provided in this embodiment uses a low voltage dropout linear regulator in the voltage stabilization circuit to stabilize the DC power supply. The low voltage dropout linear regulator has extremely low inherent noise and high power supply rejection ratio, thereby improving the power supply stability of the active probe.

[0049] Optionally, Figure 4 A schematic diagram of another power supply circuit and its corresponding oscilloscope probe provided in an embodiment of the present invention is provided. Figure 4, the working mode of the power supply port 106 includes an automatic mode. The power supply port 106 includes an authentication pin a, and the authentication pin a is connected to the control module 107; the authentication pin a is used to access the identity signal on the active probe externally connected to the power supply port 106. The control module 107 is used to control the power supply port 106 to enter the automatic mode after receiving the input signal for starting the automatic mode; in the automatic mode, the working state of the power supply port 106 is controlled by the control module 107, wherein the working state of the power supply port 106 includes an enabled state and a power-off state. The control module 107 is also used to verify the identity signal uploaded by the authentication pin a when the power supply port 106 is in the automatic mode; according to the verification result, the power supply port 106 is controlled to remain in the power-off state or change from the power-off state to the enabled state.

[0050] Specifically, the automatic mode is a working mode of the power supply port 106. In the automatic mode, the default working state of the power supply port 106 is the power-off state. Only when the control module 107 issues a corresponding instruction, the power supply port 106 switches to the enabled state and supplies power to the outside normally. In the power-off state, except for the identity authentication pin a that works normally, all other pins of the power supply port 106 are turned off and do not supply power to the outside. In the enabled state, the power supply port 106 is turned on and has a continuous power supply.

[0051] The identity authentication pin a refers to the communication pin in the power supply port 106, which is used to communicate with the communication pin of the corresponding active probe to realize the collection of the identity signal sent by the active probe. Corresponding to the identity authentication pin a, a communication pin is also provided on the power supply interface of the active probe. After the active probe is powered on, the communication pin can send an identity signal to the identity authentication pin a connected thereto, and the identity signal can include the identity information and power demand information of the active probe. The identity authentication pin a is also connected to the control module 107 to upload the identity signal to the control module 107. When the power supply port 106 is in automatic mode, the control module 107 can call the verification conditions stored locally to compare and verify the identity information and power demand information in the identity signal. When the identity information and the power demand information meet the verification conditions, the power supply port 106 is controlled to change from the power-off state to the enabled state. When the identity information and the power demand information do not meet the verification conditions, the power supply port 106 is controlled to remain in the power-off state. Exemplarily, when a power supply port 106 is further provided on the power supply interface circuit 103, the working states of the DC conversion circuit 104 and the voltage stabilizing circuit 105 can be consistent with the power supply port 106, that is, when the power supply port 106 is in a power-off state, the DC conversion circuit 104 and the voltage stabilizing circuit 105 also remain in the power-off state and stop working; when the power supply port 106 is converted to an enabled state, the DC conversion circuit 104 and the voltage stabilizing circuit 105 are also converted to an enabled state and work normally.

[0052] Exemplarily, the power supply circuit of the oscilloscope probe can sample at least one of the resistance voltage division detection method, the capacitance value detection method and the communication signal method to authenticate different types of probes. For example, in the resistance voltage division detection method, the communication pins of different types of probes can be internally connected to resistors of different resistance values, and the control module 107 or the verification circuit corresponding to the identity authentication pin a can determine the type of the corresponding probe according to the resistance value connected to the identity authentication pin a: 1Ω is determined as an active probe, 2Ω is determined as a passive probe, 3Ω is determined as a high-voltage probe, and so on. In the capacitance value detection method, the communication pins of different types of probes can be internally connected to capacitors of different capacitance values, and the control module 107 or the verification circuit corresponding to the identity authentication pin a can determine the type of the corresponding probe according to the capacitance value connected to the identity authentication pin a: 1 microfarad is determined as an active probe, 10 microfarad is determined as a passive probe, 100 microfarad is determined as a high-resistance probe, and so on. In the communication signal method, the communication pins of different types of probes can send communication signals with different contents. The control module 107 or the verification circuit corresponding to the identity authentication pin a can determine the type of the corresponding probe based on the communication signal connected to the identity authentication pin a: if the communication signal includes the number 1, the corresponding probe is determined to be an active probe; if the communication signal does not include the number 1, the corresponding probe is determined to be other probes.

[0053] The power supply circuit of the oscilloscope probe provided in the embodiment of the present invention is provided with an identity authentication pin to realize identity authentication of the active probe. The power supply port in the automatic mode can remain in a power-off state according to the control signal of the control module, and outputs electric energy only when a correct active probe is connected, so as to realize low-power sleep of the power supply circuit and greatly reduce unnecessary power consumption.

[0054] Optionally, based on the above embodiment, continue to refer to Figure 4 The working modes of the power supply port 106 include a normally closed mode and a normally open mode. The control module 107 is used to control the power supply port 106 to enter the normally closed mode after receiving an input signal to start the normally closed mode; in the normally closed mode, the power supply port 106 remains in a power-off state. The control module 107 is used to control the power supply port 106 to enter the normally open mode after receiving an input signal to start the normally open mode; in the normally open mode, the power supply port 106 remains in an enabled state.

[0055] Specifically, the normally closed mode is another working mode of the power supply port 106 different from the automatic mode. The working state of the power supply port 106 in the normally closed mode remains in the power-off state, and the power-off or enable state is no longer switched according to the signal of the control module 107. The normally open mode is another working mode of the power supply port 106 different from the automatic mode and the normally closed mode. The working state of the power supply port 106 in the normally open mode remains in the enable state, and the power-off or enable state is no longer switched according to the signal of the control module 107.

[0056] Optionally, Figure 5 A schematic diagram of another power supply circuit and its corresponding oscilloscope probe provided in an embodiment of the present invention, Figure 6 A schematic diagram of a user page of an oscilloscope operating system provided by an embodiment of the present invention, based on the above embodiment, combined with Figure 5 and Figure 6 , the number of the power supply ports 106 on the power supply interface circuit 103 is greater than 1, and the control module 107 includes an oscilloscope operating system.

[0057] Specifically, when the number of power supply ports 106 on the power supply interface circuit 103 is greater than 1, the authentication pin a of each power supply port 106 is respectively connected to the control module 107, and its own working mode and working state are switched according to the signal sent by the control module 107. The control module 107 can also control the power supply interface circuit 103 to directly cut off the power when all power supply ports 106 are in the power-off state, so that the DC conversion circuit 104 and the voltage stabilizing circuit 105 also stop using electricity, further reducing the power consumption of the circuit board under the restriction. The user interface of the oscilloscope operating system is provided with a working state operation area 501 corresponding to the power supply port 106. The user can flexibly switch the working mode of each power supply port 106 through the corresponding working state operation area 501 on the user interface of the oscilloscope operating system, thereby controlling the power supply state of the active probe connected thereto, and realizing more refined energy management.

[0058] For example, Figure 7 A flow chart of a method for controlling a power supply circuit of an oscilloscope probe provided by an embodiment of the present invention, combined with Figure 6 and Figure 7, the control method of the power supply circuit of the oscilloscope probe includes: S601, the control module obtains the input signal of the user. S602, when the input signal includes normally closed information, the control module controls the power supply port to enter the normally closed mode. S603, in the normally closed mode, the power supply port is in a power-off state. S604, after power-off, the active probe corresponding to the power supply port cannot use electricity, and the power consumption of the power supply circuit is reduced. S605, when the input signal includes normally open information, the control module controls the power supply port to enter the normally open mode. S606, in the normally open mode, the power supply port is in an enabled state. S607, after enabling, the active probe corresponding to the power supply port can continue to use electricity, and the active probe works normally. S608, when the input signal includes automatic information, the control module controls the power supply port to enter the automatic mode. S609, in the automatic mode, the power supply port only keeps the identity authentication pin to work normally, and other pins are turned off. S610, the control module determines whether the correct active probe is connected according to the identity signal connected to the identity authentication pin. S611. When a correct active probe is connected, the control module controls the power supply port to switch to an enabled state. S612. After enabling, the active probe corresponding to the power supply port can continue to use power, and the active probe works normally. S613. When no correct active probe is connected, the control module controls the power supply port to keep the identity authentication pin working normally and other pins turned off. In addition, it should be specially noted that this embodiment only exemplarily shows the case where the power supply circuit of the oscilloscope probe has three modes: a normally open mode, a normally closed mode, and an automatic mode at the same time, but it is not intended to limit the scope of protection. In other embodiments, the power supply circuit of the oscilloscope probe may also have only a normally open mode and a normally closed mode, or may have only an automatic mode. Figure 8 A flow chart of another method for controlling a power supply circuit of an oscilloscope probe provided by an embodiment of the present invention is shown in FIG. Figure 8 In the case where the power supply circuit of the oscilloscope probe has only a normally open mode and a normally closed mode, the user can manually switch between the normally open mode and the normally closed mode by operating the physical ON / OFF button or the ON / OFF dynamic icon button on the user page of the oscilloscope operating system. Fig. 9 A flow chart of a control method for a power supply circuit of an oscilloscope probe provided by an embodiment of the present invention is shown in FIG. Fig. 9 However, when the power supply circuit of the oscilloscope probe has only an automatic mode, the user does not need to operate the switch button, and the power supply circuit of the oscilloscope probe can automatically switch the mode.

[0059] The power supply circuit of the oscilloscope probe provided by the embodiment of the present invention is provided with multiple power supply ports. The control module can adjust the working mode of each power supply port according to the user's input signal, thereby realizing the refined management of the power supply port. This intelligent control strategy enables the power supply circuit to supply power to the active probe only when it is actually needed, thus significantly extending the battery life of the oscilloscope. The design of automatic power-off when no probe is connected in the automatic mode effectively prevents the occurrence of power short circuit accidents, and ensures the safe operation of the equipment and the personal safety of the user.

[0060] Optionally, Fig.10 A circuit diagram of a power supply circuit of another oscilloscope probe provided in an embodiment of the present invention is provided. Based on the above embodiment, Fig.10 The power supply circuit 100 of the oscilloscope probe further includes an energy storage module 701 . The energy storage module 701 is connected to the power supply interface circuit 103 . The energy storage module 701 is used to provide a stored DC power supply to the power supply interface circuit 103 .

[0061] Specifically, the energy storage module 701 refers to an energy storage component that stores electrical energy and provides a DC power supply to the power supply interface circuit 103. It can also provide DC power supply to other electrical appliances of the oscilloscope. Exemplarily, the energy storage module 701 may include a lithium-ion battery pack and a charging transformer. In the case where the energy storage module 701 is provided, the power supply circuit 100 of the oscilloscope probe may also include a power switching switch, wherein the first end of the power switching switch is connected to the power supply interface circuit 103, and the two interfaces at the second end of the power switching switch are respectively connected to the energy storage module 701 and the AC / DC conversion module 102. The power switching switch can switch the power supply interface circuit 103's power supply path according to the user's control.

[0062] The energy storage module 701 can also be connected to the power input interface 101. When there is an AC power supply, the energy storage module 701 can be charged by using the AC power connected to the power input interface 101. The power input interface 101 can not only supply power to the AC / DC conversion module, but also charge the energy storage module 701, thus realizing the dual-purpose of the power input interface 101. In addition, the power supply circuit 100 of the oscilloscope probe can also be provided with an energy storage charging interface, which can be provided on the housing of the energy storage module 701 or on the housing of the power supply circuit 100 of the entire oscilloscope probe. The provision of the energy storage charging interface can realize the separate charging of the energy storage module 701, thus reducing the interference to the power supply circuit of the probe. The energy storage module 701 can also be connected to the power supply interface circuit 103 and the charging interface (power input interface 101 or energy storage charging interface) respectively via a quick-release connector. When charging is required, the user can remove the energy storage module 701 as a whole, thus realizing the rapid replacement and charging of the energy storage module 701, thus further improving the power supply reliability of the power supply circuit of the oscilloscope probe.

[0063] The power supply circuit of the oscilloscope probe provided in this embodiment is provided with an energy storage module, which is connected to the power supply interface circuit and is used to provide stored DC power to the power supply interface circuit. The energy storage module is also connected to the power input interface and is also used to charge using an AC power supply, thereby realizing the application of the oscilloscope in a mobile environment and greatly improving the flexibility of the use of the oscilloscope.

[0064] The embodiment of the present invention further provides an oscilloscope. Fig.11 A schematic diagram of the composition of an oscilloscope provided in an embodiment of the present invention, referring to Fig.11 The oscilloscope 800 includes the power supply circuit 100 of the oscilloscope probe of any of the above embodiments and an active probe 801. The power supply ports 106 in the power supply circuit correspond to the active probes 801 one by one, and the number of both ports is greater than 1.

[0065] The present invention provides a power supply circuit for an oscilloscope and a probe thereof. A power input interface is connected to a power supply interface circuit via an AC / DC conversion module for accessing an AC power supply. The AC / DC conversion module converts the AC power connected to the power input interface into an initial DC power supply and supplies the power supply interface circuit. A DC conversion circuit, a voltage stabilizing circuit and a power supply port are integrated on the power supply interface circuit. The input end of the DC conversion circuit is connected to the AC / DC conversion module; the output end of the DC conversion circuit is connected to the power supply port via a voltage stabilizing circuit; and an active probe is externally connected to the power supply port to supply power to the active probe. The power supply interface circuit is also connected to a control module. The control module controls the working mode of the power supply port according to the input signal of the user, thereby realizing the power supply to the active probe. On the one hand, the setting of the power supply interface circuit greatly reduces the length of the transmission path of the electrical signal after the DC conversion and voltage stabilization processing, thereby improving the performance stability of the active probe. On the other hand, the control module is used to adjust the working mode of the power supply port, thereby reducing the probability of a short circuit failure of the power supply circuit when no power is supplied, thereby enhancing the safety of the power supply circuit.

[0066] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0067] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power supply circuit for an oscilloscope probe, characterized in that: include: Power input interface, AC / DC conversion module and power supply interface circuit; The power input interface is connected to the power supply interface circuit via the AC / DC conversion module, and the power input interface is used to access an AC power source; The AC / DC conversion module is used to convert the AC power connected to the power input interface into an initial DC power supply and supply it to the power supply interface circuit; The power supply interface circuit is integrated on the oscilloscope probe board. The power supply interface circuit includes a DC conversion circuit, a voltage stabilizing circuit and a power supply port. The power supply port is arranged on the front of the oscilloscope probe board, and the DC conversion circuit and the voltage stabilizing circuit are arranged on the back of the oscilloscope probe board. The input end of the DC conversion circuit is connected to the AC / DC conversion module; the output end of the DC conversion circuit is connected to the power supply port via the voltage stabilizing circuit; the power supply port is used to connect an external active probe to power the active probe.

2. The power supply circuit of the oscilloscope probe according to claim 1, characterized in that: Also includes: Control module; The power supply interface circuit is also connected to the control module, and the control module is used to control the working mode of the power supply port according to the input signal of the user.

3. The power supply circuit of the oscilloscope probe according to claim 2, characterized in that: The working mode of the power supply port includes an automatic mode; The power supply port includes an identity authentication pin, which is connected to the control module; the identity authentication pin is used to access the identity signal on the active probe externally connected to the power supply port; The control module is used to control the power supply port to enter the automatic mode after receiving an input signal for starting the automatic mode; in the automatic mode, the working state of the power supply port is controlled by the control module; The control module is also used to verify the identity signal uploaded by the authentication pin when the power supply port is in the automatic mode; according to the verification result, control the power supply port to remain in the power-off state or change from the power-off state to the enabled state.

4. The power supply circuit of the oscilloscope probe according to claim 2, characterized in that: The working mode of the power supply port includes a normally closed mode; The control module is used to control the power supply port to enter the normally closed mode after receiving an input signal for starting the normally closed mode; in the normally closed mode, the power supply port remains in a power-off state.

5. The power supply circuit of the oscilloscope probe according to claim 2, characterized in that: The working mode of the power supply port includes a normally open mode; The control module is used to control the power supply port to enter the normally-on mode after receiving an input signal for starting the normally-on mode; in the normally-on mode, the power supply port remains in an enabled state.

6. The power supply circuit of the oscilloscope probe according to any one of claims 1 to 5, characterized in that: The number of the power supply ports in the power supply interface circuit is greater than one.

7. The power supply circuit of the oscilloscope probe according to any one of claims 1 to 5, characterized in that: It also includes an energy storage module, which is connected to the power supply interface circuit and is used to provide stored DC power for the power supply interface circuit.

8. The power supply circuit of the oscilloscope probe according to claim 7, characterized in that: The energy storage module is also connected to the power input interface, and the energy storage module is also used to charge using the AC power supply.

9. The power supply circuit of the oscilloscope probe according to any one of claims 1 to 4, characterized in that: The voltage stabilization circuit includes a low voltage drop linear regulator.

10. An oscilloscope, characterized in that: A power supply circuit comprising the oscilloscope probe according to any one of claims 1 to 9.

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