Power input selection device and test machine

Abstract

The utility model relates to a power supply input selection device and a test machine, and the device comprises a main power supply switching circuit which is connected with a main power supply and a load, is connected when the main power supply has output, enables the main power supply to be connected with the load, and is disconnected when the main power supply does not output, and enables the main power supply to be disconnected with the load; and the auxiliary power supply switching circuit is connected with the main power supply, the auxiliary power supply and the load, is turned off when the main power supply has output, so that the auxiliary power supply is disconnected from the load, and is turned on when the main power supply does not output, so that the auxiliary power supply is connected with the load. The main power supply and the auxiliary power supply are automatically switched to supply power to the load, manual control is not needed, and the operation convenience is improved.

Description

Technical Field

[0001] The present application relates to the field of semiconductor testing technology, and in particular to a power input selection device and a tester. Background Art

[0002] Semiconductor automated testing uses automatic test equipment (ATE) to inspect various parameters of devices under test (DUTs), eliminating defective products and ensuring quality control before shipment. If a tester's resource board has a backup power supply or multiple power supplies, manual selection is required to power the controller. This is inconvenient and has the disadvantage of limited power supply convenience. Utility Model Content

[0003] Based on this, it is necessary to provide a power input selection device and a test machine that can improve the convenience of operation in order to address the above problems.

[0004] A first aspect of the present application provides a power input selection device, comprising:

[0005] a main power switching circuit, connecting the main power supply and the load, being turned on when the main power supply has output, thereby connecting the main power supply and the load, and being turned off when the main power supply has no output, thereby disconnecting the main power supply and the load;

[0006] The auxiliary power supply switching circuit connects the main power supply, the auxiliary power supply and the load, is turned off when the main power supply has output, disconnecting the auxiliary power supply from the load, and is turned on when the main power supply does not have output, connecting the auxiliary power supply to the load.

[0007] In one embodiment, the main power switching circuit includes a main power switching control unit and a main power channel unit, the main power switching control unit is connected to the main power supply and the main power channel unit, and the main power channel unit is connected to the main power supply and the load; the main power switching control unit controls the main power channel unit to be turned on when the main power supply has output, and controls the main power channel unit to be turned off when the main power supply has no output.

[0008] In one embodiment, the main power switching control unit includes a resistor R18, a resistor R19 and a switch tube Q9, the first end of the resistor R18 is connected to the main power supply, the second end of the resistor R18 is connected to the first end of the resistor R19 and the control end of the switch tube Q9, the second end of the resistor R19 is grounded, the first end of the switch tube Q9 is connected to the main power channel unit, and the second end of the switch tube Q9 is grounded.

[0009] In one embodiment, the main power channel unit includes a resistor R16, a resistor R17, a switch tube Q7, and a switch tube Q8. The first end of the resistor R17 is connected to the first end of the switch tube Q9, the second end of the resistor R17 is connected to the first end of the resistor R16, the control end of the switch tube Q7, and the control end of the switch tube Q8. The first end of the switch tube Q7 is connected to the main power supply, the second end of the switch tube Q7 is connected to the second end of the resistor R16 and the second end of the switch tube Q8, and the first end of the switch tube Q8 is connected to the load.

[0010] In one embodiment, the switch tube Q7 and the switch tube Q8 are PMOS tubes, and the switch tube Q9 is an NMOS tube.

[0011] In one embodiment, the secondary power switching circuit includes a secondary power switching control unit and a secondary power channel unit, the secondary power switching control unit is connected to the main power supply, the secondary power supply and the secondary power channel unit, and the secondary power channel unit is connected to the secondary power supply and the load; the secondary power switching control unit controls the secondary power channel unit to be turned off when the main power supply has output, and controls the secondary power channel unit to be turned on when the main power supply has no output.

[0012] In one embodiment, the secondary power switching control unit includes a resistor R12, a resistor R14, a resistor R15, a switch tube Q5 and a switch tube Q6, a first end of the resistor R14 is connected to the main power supply, a second end of the resistor R14 is connected to the first end of the resistor R15 and the control end of the switch tube Q6, a second end of the resistor R15 is grounded, a first end of the switch tube Q6 is connected to the first end of the resistor R12 and the control end of the switch tube Q5, a second end of the switch tube Q6 is grounded, a second end of the resistor R12 is connected to the secondary power supply, a first end of the switch tube Q5 is connected to the secondary power channel unit, and a second end of the switch tube Q5 is grounded.

[0013] In one embodiment, the secondary power channel unit includes a resistor R11, a resistor R13, a switch tube Q3, and a switch tube Q4. The first end of the resistor R13 is connected to the first end of the switch tube Q5, the second end of the resistor R13 is connected to the first end of the resistor R11, the control end of the switch tube Q3, and the control end of the switch tube Q4. The first end of the switch tube Q3 is connected to the secondary power supply, the second end of the switch tube Q3 is connected to the second end of the resistor R11 and the second end of the switch tube Q4, and the first end of the switch tube Q4 is connected to the load.

[0014] In one embodiment, the switch tube Q3 and the switch tube Q4 are PMOS tubes, and the switch tube Q5 and the switch tube Q6 are NMOS tubes.

[0015] A second aspect of the present application provides a test machine, comprising a secondary power supply, a main power supply and the above-mentioned power input selection device.

[0016] In the power input selection device and tester, the main power switching circuit is turned on when the main power supply is outputting, connecting the main power supply to the load, and turned off when the main power supply is not outputting, disconnecting the main power supply from the load. The auxiliary power switching circuit is turned off when the main power supply is outputting, disconnecting the auxiliary power supply from the load, and turned on when the main power supply is not outputting, connecting the auxiliary power supply to the load. This achieves automatic switching between the main and auxiliary power supplies to power the load, eliminating the need for manual control and improving operational convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a structural block diagram of a power input selection device in one embodiment;

[0018] Figure 2 is a structural schematic diagram of a power input selection device in one embodiment;

[0019] Figure 3 FIG1 is a schematic diagram of the operation of the power input selection device in one embodiment when the main power supply has output;

[0020] Figure 4 FIG. 1 is a schematic diagram of the operation of the power input selection device in one embodiment when the main power supply is not output. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0023] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if there is transmission of electrical signals or data between the connected circuits, modules, units, etc.

[0024] When used herein, the singular forms "a", "an", and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, integers, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integers, operations, components, parts, or combinations thereof.

[0025] In one embodiment, Figure 1 As shown, a power input selection device is provided, including a main power switching circuit 110 and a secondary power switching circuit 120. The main power switching circuit 110 connects the main power supply and the load. When the main power supply has an output, it is turned on to connect the main power supply and the load, and when the main power supply has no output, it is turned off to disconnect the main power supply and the load. The secondary power switching circuit 120 connects the main power supply, the secondary power supply, and the load. When the main power supply has an output, it is turned off to disconnect the secondary power supply and the load, and when the main power supply has no output, it is turned on to connect the secondary power supply and the load. The load can be a device that requires power, such as a controller. When the main power supply has an output, the load is powered by the main power supply. When the main power supply has no output (the main power supply does not exist or the voltage is too low), the load is automatically powered by the secondary power supply, ensuring reliable power supply to the load.

[0026] The specific structure of the main power switching circuit 110 is not unique. In one embodiment, Figure 2 As shown, the main power switching circuit 110 includes a main power switching control unit 112 and a main power channel unit 114. The main power switching control unit 112 connects the main power supply and the main power channel unit 114, and the main power channel unit 114 connects the main power supply and the load. The main power switching control unit 112 controls the main power channel unit 114 to turn on when the main power supply has output, and controls the main power channel unit 114 to turn off when the main power supply has no output.

[0027] Specifically, the main power switching control unit 112 may include a resistor R18, a resistor R19, and a switch Q9. The first end of the resistor R18 is connected to the main power supply, the second end of the resistor R18 is connected to the first end of the resistor R19 and the control end of the switch Q9, the second end of the resistor R19 is grounded, the first end of the switch Q9 is connected to the main power channel unit 114, and the second end of the switch Q9 is grounded. The main power switching control unit 112 may also include a capacitor C7, the first end of the capacitor C7 is connected to the control end of the switch Q9, and the second end of the capacitor C7 is grounded. The switch Q9 may be a transistor or a MOS transistor. In this embodiment, the switch Q9 is an NMOS transistor, with a gate G as the control end, a drain D as the first end, and a source S as the second end.

[0028] Furthermore, the main power channel unit 114 may include a resistor R16, a resistor R17, a switch Q7, and a switch Q8. The first end of resistor R17 is connected to the first end of switch Q9, the second end of resistor R17 is connected to the first end of resistor R16, the control end of switch Q7, and the control end of switch Q8. The first end of switch Q7 is connected to the main power supply, the second end of switch Q7 is connected to the second end of resistor R16 and the second end of switch Q8, and the first end of switch Q8 is connected to the load. The main power channel unit 114 may also include capacitors C5 and C6. The first end of capacitor C5 is connected to the first end of switch Q7, the second end of capacitor C5 is connected to the control end of switch Q7, the first end of capacitor C6 is connected to the first end of switch Q8, and the second end of capacitor C6 is connected to the control end of switch Q8. Switches Q7 and Q8 may be transistors or MOS transistors. In this embodiment, switches Q7 and Q8 are PMOS transistors, with gate G as the control end, drain D as the first end, and source S as the second end.

[0029] The specific structure of the auxiliary power switching circuit 120 is not unique. In one embodiment, continue to refer to Figure 2 The auxiliary power switching circuit 120 includes an auxiliary power switching control unit 122 and an auxiliary power channel unit 124. The auxiliary power switching control unit 122 is connected to the main power supply, the auxiliary power supply and the auxiliary power channel unit 124. The auxiliary power channel unit 124 is connected to the auxiliary power supply and the load. When the main power supply has output, the auxiliary power switching control unit 122 controls the auxiliary power channel unit 124 to be turned off, and when the main power supply has no output, controls the auxiliary power channel unit 124 to be turned on.

[0030] Specifically, the secondary power switching control unit 122 may include a resistor R12, a resistor R14, a resistor R15, a switch Q5, and a switch Q6. A first end of the resistor R14 is connected to the primary power supply, a second end of the resistor R14 is connected to the first end of the resistor R15 and the control end of the switch Q6, and a second end of the resistor R15 is grounded. A first end of the switch Q6 is connected to the first end of the resistor R12 and the control end of the switch Q5, and a second end of the switch Q6 is grounded. A second end of the resistor R12 is connected to the secondary power supply, a first end of the switch Q5 is connected to the secondary power channel unit 124, and a second end of the switch Q5 is grounded. The secondary power switching control unit 122 may also include capacitors C3 and C4. A first end of the capacitor C3 is connected to the control end of the switch Q5, a second end of the capacitor C3 is grounded, a first end of the capacitor C4 is connected to the control end of the switch Q6, and a second end of the capacitor C4 is grounded. The switch tubes Q5 and Q6 may be triodes or MOS tubes. In this embodiment, the switch tubes Q5 and Q6 are NMOS tubes, with the gate G serving as the control terminal, the drain D serving as the first terminal, and the source S serving as the second terminal.

[0031] Furthermore, the secondary power channel unit 124 includes a resistor R11, a resistor R13, a switch Q3, and a switch Q4. The first end of the resistor R13 is connected to the first end of the switch Q5, the second end of the resistor R13 is connected to the first end of the resistor R11, the control end of the switch Q3, and the control end of the switch Q4. The first end of the switch Q3 is connected to the secondary power supply, the second end of the switch Q3 is connected to the second end of the resistor R11 and the second end of the switch Q4, and the first end of the switch Q4 is connected to the load. The secondary power channel unit 124 may also include capacitors C1 and C2. The first end of the capacitor C1 is connected to the first end of the switch Q3, the second end of the capacitor C1 is connected to the control end of the switch Q3, the first end of the capacitor C2 is connected to the first end of the switch Q4, and the second end of the capacitor C2 is connected to the control end of the switch Q4. The switches Q3 and Q4 may also be triodes or MOS transistors. In this embodiment, the switches Q3 and Q4 are PMOS transistors, with a gate G as the control end, a drain D as the first end, and a source S as the second end.

[0032] Specifically, the entire power input selection device is controlled based on the primary power supply, automatically switching between the primary and secondary power inputs based on the primary power supply's output. In actual operation, there are two scenarios: first, both the primary and secondary power supplies are present (with output); and second, the primary power supply is absent (no output) but the secondary power supply is present (with output).

[0033] When the main power supply has output, the voltage is divided by resistors R14 and R15, so that the gate-source GS of the switch tube Q6 is turned on, and then the drain-source DS is turned on. When the drain D of the switch tube Q6 is low, the gate-source GS of the switch tube Q5 is not turned on, and the drain D of the switch tube Q5 is high. This makes the gate-source GS of the switch tube Q4 unable to reach the turn-on threshold voltage difference, and the switch tube Q4 is not turned on (the switch tube Q3 has a weak current due to the existence of the internal diode and is in the on state), and the auxiliary power supply is not connected to the load. However, because the main power supply has output, the gate-source GS of the switch tube Q9 is turned on, and then the drain-source DS is turned on (equivalent to the lower end of the resistor R17 being grounded). Due to the voltage division by resistors R16 and R17, the gate-source GS of the switch tubes Q7 and Q8 reach the turn-on threshold voltage, and the switch tubes Q7 and Q8 are turned on. The flow direction of the main power supply to the load is as follows Figure 3 shown.

[0034] When the main power supply is not outputting, the gate-source GS of the switch tube Q9 does not reach the turn-on threshold voltage and does not conduct. The drain D is at a high level, and the gate-source GS of the switch tube Q8 does not reach the turn-on threshold voltage difference. The switch tube Q8 does not conduct, so that the main power supply and the load are disconnected. As for the auxiliary power supply, since the main power supply has no output, the gate-source GS of the switch tube Q6 does not conduct, and the drain D is at a high level, so that the gate-source GS of the switch tube Q5 reaches the threshold voltage difference, and the drain-source DS of the switch tube Q5 is turned on. After the voltage is divided by the resistors R11 and R13, the gate-source GS of the switch tubes Q3 and Q4 reach the turn-on threshold voltage. The switch tubes Q3 and Q4 are turned on, so that the auxiliary power supply and the load are connected. The flow direction of the auxiliary power supply to the load is as follows Figure 4 shown.

[0035] In one embodiment, a test machine is further provided, comprising a secondary power supply, a main power supply and the above-mentioned power input selection device.

[0036] The power input selection device and tester described above can automatically select the input power source by building a circuit using MOS tubes. The two power sources input to the power consumption end are isolated by the MOS tubes and do not interfere with each other. The device is small in size on the circuit board and low in cost.

[0037] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned 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.

[0038] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A power input selection device, characterized in that: include: a main power switching circuit, connecting the main power supply and the load, being turned on when the main power supply has output, thereby connecting the main power supply and the load, and being turned off when the main power supply has no output, thereby disconnecting the main power supply and the load; a secondary power supply switching circuit, connecting the main power supply, the secondary power supply, and the load, shutting down when the main power supply has output, disconnecting the secondary power supply from the load, and switching on when the main power supply has no output, connecting the secondary power supply to the load; The secondary power switching circuit includes a secondary power switching control unit and a secondary power channel unit, the secondary power switching control unit is connected to the main power supply, the secondary power supply and the secondary power channel unit, and the secondary power channel unit is connected to the secondary power supply and the load; the secondary power switching control unit controls the secondary power channel unit to be turned off when the main power supply has output, and controls the secondary power channel unit to be turned on when the main power supply has no output.

2. The device according to claim 1, characterized in that The main power switching circuit includes a main power switching control unit and a main power channel unit, the main power switching control unit connects the main power supply and the main power channel unit, and the main power channel unit connects the main power supply and the load; the main power switching control unit controls the main power channel unit to turn on when the main power supply has output, and controls the main power channel unit to turn off when the main power supply has no output.

3. The device according to claim 2, characterized in that The main power switching control unit includes a resistor R18, a resistor R19 and a switch tube Q9. The first end of the resistor R18 is connected to the main power supply, the second end of the resistor R18 is connected to the first end of the resistor R19 and the control end of the switch tube Q9, the second end of the resistor R19 is grounded, the first end of the switch tube Q9 is connected to the main power channel unit, and the second end of the switch tube Q9 is grounded.

4. The device according to claim 3, characterized in that The main power channel unit includes a resistor R16, a resistor R17, a switch tube Q7, and a switch tube Q8. The first end of the resistor R17 is connected to the first end of the switch tube Q9, the second end of the resistor R17 is connected to the first end of the resistor R16, the control end of the switch tube Q7, and the control end of the switch tube Q8. The first end of the switch tube Q7 is connected to the main power supply, the second end of the switch tube Q7 is connected to the second end of the resistor R16 and the second end of the switch tube Q8, and the first end of the switch tube Q8 is connected to the load.

5. The device according to claim 4, characterized in that The switch tubes Q7 and Q8 are PMOS tubes, and the switch tube Q9 is an NMOS tube.

6. The device according to any one of claims 1 to 5, characterized in that The secondary power switching control unit includes a resistor R12, a resistor R14, a resistor R15, a switch tube Q5, and a switch tube Q6. The first end of the resistor R14 is connected to the main power supply, the second end of the resistor R14 is connected to the first end of the resistor R15 and the control end of the switch tube Q6, the second end of the resistor R15 is grounded, the first end of the switch tube Q6 is connected to the first end of the resistor R12 and the control end of the switch tube Q5, the second end of the switch tube Q6 is grounded, the second end of the resistor R12 is connected to the secondary power supply, the first end of the switch tube Q5 is connected to the secondary power channel unit, and the second end of the switch tube Q5 is grounded.

7. The device according to claim 6, characterized in that The secondary power channel unit includes a resistor R11, a resistor R13, a switch tube Q3, and a switch tube Q4. The first end of the resistor R13 is connected to the first end of the switch tube Q5, the second end of the resistor R13 is connected to the first end of the resistor R11, the control end of the switch tube Q3, and the control end of the switch tube Q4. The first end of the switch tube Q3 is connected to the secondary power supply, the second end of the switch tube Q3 is connected to the second end of the resistor R11 and the second end of the switch tube Q4, and the first end of the switch tube Q4 is connected to the load.

8. The device according to claim 7, characterized in that The switch tube Q3 and the switch tube Q4 are PMOS tubes, and the switch tube Q5 and the switch tube Q6 are NMOS tubes.

9. A testing machine, characterized in that: It comprises a secondary power supply, a main power supply and the power input selection device according to any one of claims 1 to 8.

Images