CN219801969U - Power supply switching circuit and source meter board card - Google Patents
Power supply switching circuit and source meter board card Download PDFInfo
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- CN219801969U CN219801969U CN202320937792.XU CN202320937792U CN219801969U CN 219801969 U CN219801969 U CN 219801969U CN 202320937792 U CN202320937792 U CN 202320937792U CN 219801969 U CN219801969 U CN 219801969U
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 43
- 238000012360 testing method Methods 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Abstract
The utility model relates to a power supply switching circuit and a source meter board card, comprising: a power supply output terminal; the power chip comprises a feedback pin, a grounding pin and a voltage output pin, wherein the voltage output pin is connected with the power output end; the adjustable resistor network is connected between the feedback pin and the grounding pin; the digital-to-analog conversion circuit is connected between the voltage output pin of the power supply chip and the power supply output end and is used for converting the voltage output by the power supply chip into analog voltage and outputting the analog voltage. The power supply switching circuit can output different voltages. The source surface board card manufactured based on the power supply switching circuit can have different output capacities on the basis of not changing the original functions of the source surface board card, meets more testing requirements, realizes multiple purposes of one board card and effectively reduces the cost.
Description
Technical Field
The present utility model relates to the field of power supply circuits, and in particular, to a power supply switching circuit and a source panel card.
Background
With the rapid development of the semiconductor industry, the test requirements of semiconductor devices are gradually diversified, which puts higher demands on boards (such as source-surface boards) for testing.
However, the conventional board has a relatively fixed usage environment, which cannot be applied to different test voltage requirements while ensuring the test accuracy.
Disclosure of Invention
Based on this, it is necessary to provide a power switching circuit and a source panel card which can ensure the test accuracy and meet different test voltage requirements.
A power switching circuit, comprising:
a power supply output terminal;
the power chip comprises a feedback pin, a grounding pin and a voltage output pin, wherein the voltage output pin is connected with the power output end;
the adjustable resistor network is connected between the feedback pin and the grounding pin;
the digital-to-analog conversion circuit is connected between the voltage output pin of the power supply chip and the power supply output end and is used for converting the voltage output by the power supply chip into analog voltage and outputting the analog voltage.
According to the utility model, the adjustable resistor network is connected between the feedback pin and the grounding pin of the power chip, so that the power chip outputs different voltage values and outputs the voltage values through the digital-to-analog conversion circuit. The power supply switching circuit can output different voltages. The source surface board card manufactured based on the power supply switching circuit can have different output capacities on the basis of not changing the original functions of the source surface board card, meets more testing requirements, realizes multiple purposes of one board card and effectively reduces the cost.
In one embodiment, the power switching circuit further includes:
and the control circuit is connected with the adjustable resistance network and used for controlling and adjusting the resistance of the adjustable resistance network.
In one embodiment, the adjustable resistance network comprises a resistance network controller connected with the control circuit and used for controlling and adjusting the resistance of the adjustable resistance network according to the command of the control circuit.
In one embodiment, the resistor network controller includes a first switch and a second switch, the adjustable resistor network further includes a first resistor, a second resistor, and a third resistor, the first switch is connected in parallel with the first resistor, the second switch is connected in parallel with the second resistor, and the first resistor, the second resistor, and the third resistor are connected in series.
In one embodiment, the power switching circuit further includes:
and the analog-to-digital conversion circuit is connected with the digital-to-analog conversion circuit and is used for measuring the analog voltage.
In one embodiment, the power supply chip includes a positive power supply chip and a negative power supply chip, and the positive power supply chip and the negative power supply chip are respectively connected to different input ends of the digital-to-analog conversion circuit.
In one embodiment, the adjustable resistor network comprises:
the first adjustable resistor network is connected between the feedback pin and the grounding pin of the positive power supply chip;
and the second adjustable resistor network is connected between the feedback pin and the grounding pin of the negative power supply chip.
In one embodiment, the power supply switching circuit includes a plurality of power supply output terminals and a plurality of digital-to-analog conversion circuits, each of the digital-to-analog conversion circuits is connected to the positive power supply chip and the negative power supply chip through different input terminals, and output terminals of the different digital-to-analog conversion circuits are connected to different power supply output terminals.
In one embodiment, the power supply switching circuit further comprises a switching circuit connected to the power supply chip and used for controlling the switching of the power supply chip.
A source panel card comprises a circuit board and the power supply switching circuit in any embodiment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present utility model, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
FIG. 1 is a schematic diagram of a power switching circuit according to an embodiment;
FIG. 2 is a schematic diagram of a power switching circuit according to another embodiment;
FIG. 3 is a schematic diagram of a power switching circuit according to another embodiment;
fig. 4 is a schematic diagram of connection between a power chip and an adjustable resistor network according to an embodiment.
Reference numerals illustrate: 100-power output end, 200-power chip, 210-positive power chip, 220-negative power chip, 201-feedback pin, 202-ground pin, 203-voltage output pin, 300-adjustable resistance network, 310-first adjustable resistance network, 320-second adjustable resistance network, 400-digital-to-analog conversion circuit, 500-control circuit, 600-switch circuit, 610-first MOS tube, 620-second MOS tube, 700-analog-to-digital conversion circuit.
Detailed Description
In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. Embodiments of the utility model are illustrated in the accompanying drawings. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.
It will be understood that the terms first, second, etc. as used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the utility model. Both the first resistor and the second resistor are resistors, but they are not the same resistor.
It is to be understood that in the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", etc., if the connected circuits, chips, etc., have electrical signals or data transferred therebetween.
It is understood that "at least one" means one or more and "a plurality" means two or more. "at least part of an element" means part or all of the element.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.
An embodiment of the utility model provides a source surface board card, which comprises a circuit board and a power supply switching circuit positioned on the circuit board. For example, the source-meter board includes a source-measurement unit (Source Measure Unit, SMU). The source measurement unit has four operation modes, namely a Voltage source mode (FV), a Current source mode (FI), a measurement Voltage Mode (MV), and a measurement Current Mode (MI).
In one embodiment, a power switching circuit is provided that includes a power output 100, a power chip 200, an adjustable resistor network 300, and a digital-to-analog conversion circuit 400.
The power chip 200 includes a feedback pin 201, a ground pin 202, and a voltage output pin 203, where the voltage output pin 203 is connected to the power output terminal 100, and the power output terminal 100 is used for outputting a voltage, and the number of the power output terminals 100 is not limited herein, and may be one or multiple.
The adjustable resistor network 300 is connected between the feedback pin 201 and the ground pin 202 of the power chip 200, and the value fed back to the power chip 200 is controlled by adjusting the resistance value of the adjustable resistor network 300, so that the power chip 200 outputs different voltage values.
A digital-to-analog conversion (DAC) circuit is connected between the voltage output pin 203 of the power chip 200 and the power output terminal 100, and the digital-to-analog conversion circuit 400 can convert the voltage output by the power chip 200 into an analog voltage and output the analog voltage to the power output terminal 100. The number of the digital-to-analog conversion circuits 400 is not limited herein, and may be set according to actual needs.
In this embodiment, the adjustable resistor network 300 is connected between the feedback pin 201 and the ground pin 202 of the power chip 200, so that the power chip 200 outputs different voltage values and outputs the voltage values through the digital-to-analog conversion circuit 400. The power supply switching circuit can output different voltages. The source surface board card manufactured based on the power supply switching circuit can have different output capacities on the basis of not changing the original functions of the source surface board card, meets more testing requirements, realizes multiple purposes of one board card and effectively reduces the cost.
In one embodiment, the power switching circuit further includes a control circuit 500, where the control circuit 500 is connected to the adjustable resistance network 300, and can control and adjust the resistance of the adjustable resistance network 300. For example, the control circuit 500 includes, but is not limited to being, a Field Programmable Gate Array (FPGA).
In other embodiments, the resistance of the adjustable resistance network 300 of the power switching circuit may be controlled and adjusted by an external controller. The utility model is not limited in this regard.
In one embodiment, the adjustable resistive network 300 includes a resistive network controller coupled to the control circuit 500 that receives commands from the control circuit 500 and directly controls the resistance of the adjustable resistive network 300.
In this embodiment, the resistor network controller receives the control command given by the control circuit 500, and directly controls and adjusts the resistance between the feedback pin 201 and the ground pin 202 of the power chip 200 to which the adjustable resistor network 300 is connected.
In one embodiment, the resistive network controller includes a first switch and a second switch, which may include, but are not limited to, a relay.
The adjustable resistor network 300 further includes a first resistor, a second resistor, and a third resistor.
The first switch is connected with the first resistor in parallel, the second switch is connected with the second resistor in parallel, and the first resistor, the second resistor and the third resistor are connected in series.
The resistor network controller receives the control signal given by the control circuit 500, and controls the first resistor, the second resistor and the third resistor of the adjustable resistor network 300, and specifically, the control signal given by the control circuit 500 directly represents the on and off of the first switch and the second switch. For example, when the first switch is turned on and the second switch is turned off, the first resistor and the second resistor are shorted, and only the third resistor is connected between the feedback pin 201 and the ground pin 202 of the power chip 200. Or when the first switch is opened and the second switch is closed, the second resistor is short-circuited, and the first resistor and the third resistor are connected between the feedback pin 201 and the ground pin 202 of the power chip 200. Still alternatively, when the first switch is turned off and the second switch is turned off, the first resistor, the second resistor, and the third resistor are connected between the feedback pin 201 and the ground pin 202 of the power chip 200. Alternatively, when the first switch is closed and the second switch is opened, the first resistor is shorted, and the second resistor and the third resistor are connected between the feedback pin 201 and the ground pin 202 of the power chip 200.
By controlling the resistance between the feedback pin 201 and the ground pin 202 of the power chip 200 connected to the adjustable resistor network 300, the power chip 200 outputs different voltage values, specifically, the output voltage of the power chip 200 may be expressed as:
wherein X is a fixed value; a is determined by the power chip 200; r is the resistance between the feedback pin 201 and the ground pin 202 of the power chip 200 to which the adjustable resistor network 300 is connected. The above formula is available from a data manual of the power chip 200, which may be referred to as a circuit output adjustment formula.
For example, when the power chip 200 is an LTM8027 chip, X may take a value of 623.77, and a may take a value of 1.23, at which time the output voltage may be expressed as:
in this embodiment, the control circuit 500 gives a control signal to the adjustable resistor network 300, specifically, the control circuit 500 gives a control signal to the resistor network controller, so that the resistor network controller directly controls the resistance value of the adjustable resistor network 300 connected to the power chip 200, and more specifically, the control signal given by the control circuit 500 controls the first switch and the second switch to be turned on or off, so that the first resistor connected in parallel to the first switch and the second resistor connected in parallel to the second switch are shorted or connected between the feedback pin 201 and the ground pin 202 of the power chip 200. The resistance of the adjustable resistor network 300 is controlled, so that the value fed back to the power chip 200 can be controlled, and the power chip 200 can output different voltages.
In one embodiment, the power switching circuit further includes an analog-to-digital conversion (ADC) circuit, and the ADC circuit 700 is connected to the digital-to-analog conversion circuit 400, which can measure the analog voltage from the digital-to-analog conversion circuit 400.
The number of the analog-to-digital conversion circuits 700 may be set according to the number of the output terminals of the analog-to-digital conversion circuit 400 in practical situations. For example, when the digital-to-analog conversion circuit 400 is an AD5522 chip and the analog-to-digital conversion circuit 700 is an AD7609 chip, the AD5522 chip has four paths of outputs and the AD7609 chip has eight paths of inputs, so that the number of the analog-to-digital conversion circuits 700 can be twice as large as that of the digital-to-analog conversion circuit 400, thereby matching the number of the input ends and the output ends and improving the utilization rate of the circuit.
In this embodiment, the analog-to-digital conversion circuit may measure the analog voltage from the digital-to-analog conversion circuit 400 and convert the analog voltage into a digital voltage value, so that the output voltage of the power switching circuit is more intuitive.
In one embodiment, the power chip 200 includes a positive power chip 210 and a negative power chip 220, and the positive power chip 210 and the negative power chip 220 are respectively connected to different input terminals of the digital-to-analog conversion circuit 400.
As an example, the positive power supply chip 210 and the negative power supply chip 220 may each include one output terminal, and the digital-to-analog conversion circuit 400 may include two input terminals connected to the output terminal of the positive power supply chip 210 and the output terminal of the negative power supply chip 220, respectively.
The positive power supply chip 210 may output a positive voltage, the negative power supply chip 220 may output a negative voltage, the positive power supply chip 210 and the negative power supply chip 220 may output two voltage values at the same time, and the digital-to-analog conversion circuit 400 converts the voltage values of the digital quantity into analog voltages and outputs the analog voltages to the power supply output terminal 100 using the two voltage values as power supply rails. The positive power chip 210 and the negative power chip 220 can output different voltage values at different times, and the power rail of the digital-to-analog conversion circuit 400 changes, and the voltage output capability also changes.
In one embodiment, the adjustable resistive network 300 includes a first adjustable resistive network 310 and a second adjustable resistive network 320.
The first adjustable resistor network 310 is connected between the feedback pin 201 and the ground pin 202 of the positive power chip 210, and the first adjustable resistor network 310 receives a control command given by the control circuit 500 and adjusts the resistance connected between the feedback pin 201 and the ground pin 202 of the positive power chip 210, so that the positive power chip 210 outputs different positive voltages.
The second adjustable resistor network 320 is connected between the feedback pin 201 and the ground pin 202 of the negative power chip 220, and the second adjustable resistor network 320 receives a control command given by the control circuit 500, adjusts the resistance connected between the feedback pin 201 and the ground pin 202 of the negative power chip 220, and enables the negative power chip 220 to output different negative voltages.
In one embodiment, the power switching circuit may include a plurality of power output terminals 100 and a plurality of digital-to-analog conversion circuits 400, where each digital-to-analog conversion circuit 400 is connected to the positive power chip 210 and the negative power chip 220 through different input terminals, and the output terminals of different digital-to-analog conversion circuits 400 are connected to different power output terminals 100. At this time, the voltages output by the positive power chip 210 and the negative power chip 220 may be respectively sent to each digital-to-analog conversion circuit 400, and different digital-to-analog conversion circuits 400 may output different voltages with the same power rail, and further output the voltages to the power output terminal 100, so as to provide more voltage choices for the subsequent circuit testing.
In one embodiment, the power switching circuit further includes a switching circuit 600. The switching circuit 600 is connected to the power chip 200 and controls switching of the power chip 200. The switching circuit 600 may be controlled by the control circuit 500. The control circuit 500 may control the switching circuit 600 to be turned on and off. When the switching circuit 600 is not turned on, the power chip 200 does not enter the operating state, and the output voltage thereof cannot be adjusted by the adjustable resistor network 300. When the switch circuit 600 is turned on, the power chip 200 is in a working state, and the control circuit 500 controls the output voltage of the power chip 200 by controlling the adjustable resistor network 300, so that the output voltage of the power chip 200 can be effectively adjusted.
As an example, the switching circuit 600 may include a first MOS transistor 610 and a second MOS transistor 620. The first MOS transistor 610 is connected to the positive power chip 210, and controls an operation state of the positive power chip 210, i.e., controls switching of the positive power chip 210. The second MOS transistor 620 is connected to the negative power chip 220, and controls the working state of the negative power chip 220, i.e., controls the switching of the negative power chip 220.
In the description of the present specification, reference to the term "some embodiments," "other embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the present utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of the utility model should be assessed as that of the appended claims.
Claims (10)
1. A power switching circuit, comprising:
a power supply output terminal;
the power chip comprises a feedback pin, a grounding pin and a voltage output pin, wherein the voltage output pin is connected with the power output end;
the adjustable resistor network is connected between the feedback pin and the grounding pin;
the digital-to-analog conversion circuit is connected between the voltage output pin of the power supply chip and the power supply output end and is used for converting the voltage output by the power supply chip into analog voltage and outputting the analog voltage.
2. The power switching circuit of claim 1, further comprising:
and the control circuit is connected with the adjustable resistance network and used for controlling and adjusting the resistance of the adjustable resistance network.
3. The power switching circuit of claim 2, wherein the adjustable resistance network comprises a resistance network controller coupled to the control circuit for controlling the resistance of the adjustable resistance network in response to a command from the control circuit.
4. The power switching circuit of claim 3 wherein the resistor network controller comprises a first switch and a second switch, the adjustable resistor network further comprising a first resistor, a second resistor, and a third resistor, the first switch being in parallel with the first resistor, the second switch being in parallel with the second resistor, the first resistor, the second resistor, and the third resistor being in series.
5. The power switching circuit of claim 1, further comprising:
and the analog-to-digital conversion circuit is connected with the digital-to-analog conversion circuit and is used for measuring the analog voltage.
6. The power switching circuit of claim 1, wherein the power supply chip comprises a positive power supply chip and a negative power supply chip, the positive power supply chip and the negative power supply chip being respectively connected to different input terminals of the digital-to-analog conversion circuit.
7. The power switching circuit of claim 6, wherein the adjustable resistor network comprises:
the first adjustable resistor network is connected between the feedback pin and the grounding pin of the positive power supply chip;
and the second adjustable resistor network is connected between the feedback pin and the grounding pin of the negative power supply chip.
8. The power switching circuit of claim 6, wherein the power switching circuit comprises a plurality of power outputs and a plurality of digital-to-analog conversion circuits, each digital-to-analog conversion circuit being connected to the positive power supply chip and the negative power supply chip through a different input, and the outputs of the different digital-to-analog conversion circuits being connected to different power outputs.
9. The power switching circuit of claim 1, further comprising a switching circuit connected to the power chip and configured to control switching of the power chip.
10. A source board card comprising a circuit board and a power switching circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320937792.XU CN219801969U (en) | 2023-04-24 | 2023-04-24 | Power supply switching circuit and source meter board card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320937792.XU CN219801969U (en) | 2023-04-24 | 2023-04-24 | Power supply switching circuit and source meter board card |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219801969U true CN219801969U (en) | 2023-10-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320937792.XU Active CN219801969U (en) | 2023-04-24 | 2023-04-24 | Power supply switching circuit and source meter board card |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219801969U (en) |
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2023
- 2023-04-24 CN CN202320937792.XU patent/CN219801969U/en active Active
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