Floating power supply output device and testing machine
By introducing a charge and discharge module and a switching switch unit into the floating power output device, the problems of large size, high cost and influence of power supply noise under large current output are solved, and more efficient and more accurate chip testing is achieved.
Patent Information
- Application Number
- CN202420648370.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-03-29
AI Technical Summary
In the chip test scenario with high current output, existing floating power output devices require the use of isolated power modules with high current output capabilities, resulting in large size, high cost, and easy introduction of power supply noise to affect measurement accuracy.
Design a floating power output device, including an isolated power module, a voltage processing module, a charge and discharge module and a signal conditioning module. The charge and discharge module charge and discharge by receiving the output voltage of the voltage processing module to power the signal conditioning module and reduce isolation. The power module is relied on and the conduction of power supply noise is controlled by switching switch units, and a non-isolated power module is used to reduce cost and volume.
It realizes the reduction of the volume of the isolated power supply module in the high current output scenario, reduces the cost, and eliminates the impact of power supply noise on measurement accuracy, improving the test accuracy.
Smart Images
Figure CN222356010U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of chip testing, and in particular to a floating power supply output device and a testing machine. Background Art
[0002] Chip testing refers to the use of the test machine to output test signals to detect the various parameters of the device under test, eliminate defective products and control the factory quality of semiconductor devices. The floating power supply output device is the excitation voltage source of the device under test, providing a controllable, measurable, and near-ideal power supply. In some test scenarios, such as the on-resistance measurement of MOS tubes and optocouplers, the measured signal may have a high common-mode voltage. The floating design can have a good suppression effect on the common-mode voltage. If the power supply voltage of the device under test is isolated, in order not to destroy the electrical isolation characteristics of the device under test, a floating power supply output device is also required for measurement.
[0003] In the prior art, in a test scenario with large current output (several amperes), if a floating power output device is used directly to provide continuous power, an isolated power module with a very high current output capability needs to be selected, which makes the isolated power module very large and the cost very high. Utility Model Content
[0004] Based on this, it is necessary to provide a floating power supply output device and a testing machine to address the above technical problems.
[0005] In a first aspect, an embodiment of the present utility model provides a floating power supply output device, the device comprising:
[0006] An isolation power supply module, coupled to an external power supply, and configured to receive electrical energy from the external power supply;
[0007] A voltage processing module, connected to the isolated power supply module, and used for converting the output voltage of the isolated power supply module;
[0008] A charging and discharging module, connected to the voltage processing module, and used to receive the output voltage of the voltage processing module for charging and then discharging;
[0009] The signal conditioning module is connected to the charging and discharging module, and is used to receive the power supply of the charging and discharging module and output a power signal after conditioning the reference signal.
[0010] In one embodiment, the voltage processing module has power supply capability, and the voltage processing module and the charge-discharge module simultaneously supply power to the signal conditioning module.
[0011] In one embodiment, the voltage processing module does not have a power supply capability, and the charge-discharge module alone supplies power to the signal conditioning module.
[0012] In one embodiment, the signal conditioning module includes:
[0013] A signal conditioning unit, used for receiving a reference signal and a current feedback signal / voltage feedback signal, and outputting a first signal after conditioning;
[0014] a power amplifying unit, connected to the signal conditioning unit and the charging and discharging module, configured to receive power from the charging and discharging module, amplify the power of the first signal and then output a power signal;
[0015] A signal sampling unit, connected to the power amplification unit and the device under test, and configured to sample the power supply signal to obtain a sampling signal;
[0016] A current feedback unit, connected to the signal sampling unit, for obtaining the sampling signal and outputting a current feedback signal to the signal conditioning unit;
[0017] A voltage feedback unit is connected to the device under test, and is used to obtain a voltage signal of the device under test and output a voltage feedback signal to the signal conditioning unit.
[0018] In one embodiment, the charging and discharging module includes at least one capacitor connected to the output end of the voltage processing module, and the capacitor is also connected to the power amplification unit.
[0019] In one embodiment, the device further comprises:
[0020] A switching unit connected between the voltage processing module and the charging and discharging module;
[0021] The control unit is used to control the switching unit to be turned on to control the charging of the charging and discharging module, and to control the switching unit to be turned off when the charging and discharging module is discharging.
[0022] In one embodiment, the switching unit includes two relays respectively connected between the voltage processing module and the charging and discharging module.
[0023] In one embodiment, the voltage processing module is a low dropout linear regulator.
[0024] In a second aspect, an embodiment of the present utility model provides a floating power supply output device, the device comprising:
[0025] A non-isolated power supply module, connected to an external power supply, and used to receive electric energy from the external power supply;
[0026] A voltage processing module, connected to the non-isolated power supply module, and used for converting the output voltage of the non-isolated power supply module;
[0027] A switching unit connected to the voltage processing module;
[0028] A charging and discharging module, connected to the switching unit, and used to receive the output voltage of the voltage processing module for charging and then discharging;
[0029] A signal conditioning module, connected to the charging and discharging module, for receiving power from the charging and discharging module and outputting a power signal after conditioning a reference signal;
[0030] The control unit is used to control the switching unit to be turned on to control the charging of the charging and discharging module, and to control the switching unit to be turned off when the charging and discharging module is discharging.
[0031] In a third aspect, an embodiment of the present invention provides a testing machine, comprising the floating power supply output device as described in the first aspect or the second aspect.
[0032] Compared with the prior art, the present technical solution adds a charge and discharge module, which receives the output voltage of the voltage processing module for charging and then discharging to power the signal conditioning module. This eliminates the need to use an isolated power supply module with a high current output capability, thereby reducing the size of the isolated power supply module and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] Figure 1 This is a schematic diagram of the structure of the floating power output device in the first embodiment of the utility model;
[0034] Figure 2 This is a schematic diagram of the overall structure of the floating power output device in the first embodiment of the utility model;
[0035] Figure 3 This is a schematic diagram of the overall structure of the floating power output device in the second embodiment of the utility model;
[0036] Figure 4 It is a schematic diagram of the overall structure of the floating power output device in the third embodiment of the utility model.
[0037] Among them, 10, isolated power supply module; 20, voltage processing module; 30, charging and discharging module; 40, signal conditioning module; 50, switching switch unit; 60, non-isolated power supply module. DETAILED DESCRIPTION
[0038] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
[0039] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.
[0040] Reference to "embodiments" in this application means that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in multiple embodiments of the application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application can be combined with other embodiments without conflict.
[0041] Unless otherwise defined, the technical terms or scientific terms involved in this application should be understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the" and the like involved in this application do not indicate a quantitative limitation, and may represent the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships, for example, "A and / or B" can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.
[0042] like Figure 1As shown, the first embodiment of the present application proposes a floating power supply output device, including: an isolated power supply module 10, coupled to an external power supply, for receiving electric energy from the external power supply; a voltage processing module 20, connected to the isolated power supply module, for converting and processing the output voltage of the isolated power supply module; a charge and discharge module 30, connected to the voltage processing module, for receiving the output voltage of the voltage processing module for charging and then discharging; a signal conditioning module 40, connected to the charge and discharge module, for receiving power from the charge and discharge module, and outputting a power signal after conditioning a reference signal.
[0043] In this embodiment, the charge and discharge module 30 receives the output voltage of the voltage processing module 20 for charging and then discharging to supply power (partial power supply or full power supply) to the signal conditioning module 40, thereby eliminating the need to select an isolated power supply module with a high current output capability, thereby reducing the size of the isolated power supply module and reducing costs.
[0044] Figure 2 FIG. 1 is a schematic diagram of the overall structure of the floating power output device of the first embodiment.
[0045] like Figure 2 As shown, the charge and discharge module 30 includes at least one capacitor connected to the output end of the voltage processing module 20.
[0046] The number of capacitors is determined according to the power requirement of the signal conditioning module 40 . When the power requirement is high, multiple capacitors connected in parallel may be used. When the power requirement is low, one capacitor may be used. Figure 2 In the example, two capacitors C1 and C2 connected in parallel are taken.
[0047] The voltage processing module 20 is, for example, a low dropout linear regulator LDO.
[0048] Among them, the signal conditioning module 40 includes: a signal conditioning unit U1, which is used to receive a reference signal and a current feedback signal / voltage feedback signal, and output a first signal after conditioning; a power amplification unit U2, which is connected to the signal conditioning unit U1 and the charge and discharge module 30, and is used to receive the power supply of the charge and discharge module 30, and output a power signal after amplifying the power of the first signal; a signal sampling unit RL, which is connected to the power amplification unit U2 and the device under test DUT, and is used to sample the power signal to obtain a sampling signal; a current feedback unit U3, which is connected to the signal sampling unit RL, and is used to obtain the sampling signal and output a current feedback signal to the signal conditioning unit U1; a voltage feedback unit U4, which is connected to the device under test DUT, and is used to obtain the voltage signal of the device under test, and output a voltage feedback signal to the signal conditioning unit U1.
[0049] The signal sampling unit RL can be equivalent to an adjustable resistance, and the resistance is in ohm level.
[0050] In this embodiment, the channel selection switch S1 can be used to select the current feedback unit U3 or the voltage feedback unit U4 to form a current feedback loop or a voltage feedback loop.
[0051] When the current feedback unit U3 is selected for connection through the channel selection switch S1, the signal conditioning unit U1 receives the reference signal of the digital-to-analog converter DAC, and outputs the first signal to the power amplifier unit U2 after conditioning. The power amplifier unit U2 receives the power supply of the charge and discharge module 30, amplifies the power of the first signal and outputs the power signal. The signal sampling unit RL samples the power signal to obtain a sampling signal. The subsequent current feedback unit U3 is connected to both ends of the signal sampling unit RL, converts the sampling signal into a current feedback signal, and re-injects it into the signal conditioning unit U1 to re-condition the reference signal, and drives the power amplifier unit U2 to further adjust the output until the current steady state is reached. At the same time, the analog-to-digital converter ADC can also be sampled to sample the current feedback signal.
[0052] When the voltage feedback unit U4 is selected for connection through the channel selection switch S1, the voltage feedback unit U4 is connected to both ends of the device under test DUT, and the voltage signal at both ends of the device under test DUT is converted into a voltage feedback signal and re-injected into the signal conditioning unit U1 to re-condition the reference signal, and then drive the power amplifier unit U2 to further adjust the output until the voltage reaches a steady state. At the same time, the analog-to-digital converter ADC can also be sampled to sample the voltage feedback signal.
[0053] The charge and discharge module 30 is in a state of charging and storing energy most of the time, and releasing energy takes a very short time. When it is necessary to power the subsequent power amplifier unit U2, it can provide an instantaneous large current to achieve the purpose of pulsed large current output. At the same time, there is no need to use an isolated power supply module with a very high current output capability, which reduces the size of the isolated power supply module and reduces costs.
[0054] When the voltage processing module 20 has power supply capability, such as a low voltage dropout linear regulator LDO with power supply capability, the voltage processing module and the charge and discharge module simultaneously supply power to the signal conditioning module, and the volume of the charge and discharge module (capacitor) can be reduced.
[0055] When the voltage processing module does not have the power supply capability, the charge and discharge module supplies power to the signal conditioning module alone.
[0056] In the first embodiment, since the isolated power supply module 10 is always coupled to the external power supply during the discharge process of the charge and discharge module 20, the isolated power supply module 10 will introduce conducted interference of power supply noise and conduct it through the low impedance path of the device under test DUT, affecting the measurement accuracy and being difficult to eliminate.
[0057] To solve this technical problem, the second embodiment proposes a floating power output device, such as Figure 3 As shown, the difference between this embodiment and the first embodiment is that the device also includes: a switching switch unit 50, connected between the voltage processing module 20 and the charge and discharge module 30; a control unit (not shown in the figure), used to control the switching switch unit 50 to be turned on to control the charging of the charge and discharge module 30, and to control the switching switch unit 50 to be turned off when the charge and discharge module 30 is discharging.
[0058] When the charge and discharge module 30 needs to be charged, the control unit controls the switching unit 50 to be turned on to charge the charge and discharge module 30, and when the charge and discharge module 30 is discharged, the switching unit 50 is controlled to be turned off. After the switching unit 50 is turned off, the isolation power supply module 10 is isolated from the post-stage signal conditioning module 40, which can meet the requirements of floating output, and the power supply noise cannot be transmitted to the device under test, thereby eliminating the influence of the power supply noise and improving the measurement accuracy.
[0059] The switch unit 50 includes two relays K1 and K2 respectively connected between the voltage processing module 20 and the charge and discharge module 30 .
[0060] It should be noted that the switching switch unit 50 may also use other switching elements, such as a switch tube, etc., which is not limited in this embodiment.
[0061] Similarly, to solve the technical problem of power supply noise, the third embodiment proposes a floating power supply output device, which differs from the second embodiment in that a non-isolated power supply module is used. Compared with an isolated power supply module, a non-isolated power supply module is smaller in size and lower in cost.
[0062] Figure 4 FIG. 1 is a schematic diagram of the overall structure of the floating power output device of the third embodiment. Figure 4 As shown, the device includes: a non-isolated power supply module 60, connected to an external power supply, for receiving electric energy from the external power supply; a voltage processing module 20, connected to the non-isolated power supply module 60, for converting and processing the output voltage of the non-isolated power supply module 60; a switching switch unit 50, connected to the voltage processing module 20; a charge and discharge module 30, connected to the switching switch unit 50, for receiving the output voltage of the voltage processing module 20 for charging and then discharging; a signal conditioning module 40, connected to the charge and discharge module 30, for receiving the power supply of the charge and discharge module 30, and outputting a power signal after conditioning a reference signal; a control unit (not shown in the figure), for controlling the switching switch unit 50 to be turned on to control the charging of the charge and discharge module 30, and to control the switching switch unit 50 to be turned off when the charge and discharge module 30 is discharging.
[0063] When the charge and discharge module 30 needs to be charged, the control unit controls the switching unit 50 to be turned on to charge the charge and discharge module 30, and when the charge and discharge module 30 is discharged, the switching unit 50 is controlled to be turned off. After the switching unit 50 is turned off, the non-isolated power supply module 60 is isolated from the post-stage signal conditioning module 40, which can also meet the floating output requirements, and the power supply noise cannot be transmitted to the device under test, thereby eliminating the influence of the power supply noise and improving the measurement accuracy.
[0064] The fourth embodiment of the present application further provides a testing machine, comprising the floating power supply output device in the above embodiment.
[0065] Since the test machine includes the floating power supply output device in the above embodiment, it can solve the same technical problem and achieve the same technical effect, which will not be described in detail here.
[0066] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0067] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.
Claims
1. A floating power output device, characterized in that: The device comprises: An isolation power supply module, coupled to an external power supply, and configured to receive electrical energy from the external power supply; A voltage processing module, connected to the isolated power supply module, and used for converting the output voltage of the isolated power supply module; A charging and discharging module, connected to the voltage processing module, and used to receive the output voltage of the voltage processing module for charging and then discharging; The signal conditioning module is connected to the charging and discharging module, and is used to receive the power supply of the charging and discharging module and output a power signal after conditioning the reference signal.
2. The floating power output device according to claim 1, characterized in that: The voltage processing module has power supply capability, and the voltage processing module and the charge-discharge module simultaneously supply power to the signal conditioning module.
3. The floating power output device according to claim 1, characterized in that: The voltage processing module does not have power supply capability, and the charging and discharging module alone supplies power to the signal conditioning module.
4. The floating power output device according to claim 1, characterized in that: The signal conditioning module comprises: A signal conditioning unit, used for receiving a reference signal and a current feedback signal / voltage feedback signal, and outputting a first signal after conditioning; a power amplification unit, connected to the signal conditioning unit and the charge-discharge module, configured to receive power from the charge-discharge module, amplify the power of the first signal, and then output a power signal; A signal sampling unit, connected to the power amplification unit and the device under test, and configured to sample the power supply signal to obtain a sampling signal; A current feedback unit, connected to the signal sampling unit, for obtaining the sampling signal and outputting a current feedback signal to the signal conditioning unit; A voltage feedback unit is connected to the device under test, and is used to obtain a voltage signal of the device under test and output a voltage feedback signal to the signal conditioning unit.
5. The floating power output device according to claim 4, characterized in that: The charging and discharging module includes at least one capacitor connected to the output end of the voltage processing module, and the capacitor is also connected to the power amplification unit.
6. The floating power output device according to claim 1, characterized in that: The device also includes: A switching unit connected between the voltage processing module and the charging and discharging module; The control unit is used to control the switching unit to be turned on to control the charging of the charging and discharging module, and to control the switching unit to be turned off when the charging and discharging module is discharging.
7. The floating power output device according to claim 6, characterized in that: The switching unit includes two relays respectively connected between the voltage processing module and the charging and discharging module.
8. The floating power output device according to claim 1, characterized in that: The voltage processing module is a low voltage drop linear regulator.
9. A floating power output device, characterized in that: The device comprises: A non-isolated power supply module, connected to an external power supply, and used to receive electric energy from the external power supply; A voltage processing module, connected to the non-isolated power supply module, and used for converting the output voltage of the non-isolated power supply module; A switching unit connected to the voltage processing module; A charging and discharging module, connected to the switching unit, and used to receive the output voltage of the voltage processing module for charging and then discharging; A signal conditioning module, connected to the charging and discharging module, for receiving power from the charging and discharging module and outputting a power signal after conditioning a reference signal; The control unit is used to control the switching unit to be turned on to control the charging of the charging and discharging module, and to control the switching unit to be turned off when the charging and discharging module is discharging.
10. A testing machine, characterized in that: It comprises the floating power output device as claimed in any one of claims 1 to 9.