Adjustable current type load driving circuit for testing
By designing an adjustable current load drive circuit and using a switch group to control the series or parallel connection of load units, the problem of non-adjustable drive current in the prior art is solved, and flexible testing of the current capability of the controller pins is realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SONKWO COM
- Filing Date
- 2025-06-20
- Publication Date
- 2026-04-21
AI Technical Summary
The existing drive circuit cannot be adjusted to provide the drive current input to the controller pins, making it impossible to effectively test the controller's drive current capability.
An adjustable current load drive circuit is designed. Through an adjustable DC power supply, a load group, a first switch group, and a second switch group, the load units can be connected in series or in parallel. Combined with a turn-on indicator circuit, the flexibility of current adjustment is ensured.
It enables adjustment of different input currents to the controller pins, facilitating the testing of the current capability of the controller pins and meeting the testing requirements of different controllers.
Smart Images
Figure CN224152887U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to drive circuits, specifically to an adjustable current load drive circuit for testing. Background Technology
[0002] When testing the controller, since each controller (e.g., STM32 series chips are controllers) has different pins, a driver circuit is needed to power the controller pins when testing each controller pin.
[0003] In existing technology, the drive circuit includes an adjustable DC power supply, which directly outputs either 12V or 24V. The output terminal of the adjustable DC power supply is the output terminal of the drive circuit. The drive circuit can select to output either 12V or 24V, but the drive current capability of each pin is different. When the drive circuit is powered by 12V, the drive current input to the controller pin is constant. Since the drive current input to the controller pin cannot be adjusted, the drive current capability of the controller cannot be tested and verified, causing difficulties in the testing process. Utility Model Content
[0004] This invention provides an adjustable current load drive circuit for testing, solving the problem in the prior art that the drive current cannot be adjusted to the input of the controller pin.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] This utility model discloses an adjustable current load drive circuit for testing, comprising: an adjustable DC power supply, a load group, a first switch group, a second switch group, and a connection indicator circuit; the adjustable DC power supply is provided with a first power supply terminal and a second power supply terminal, the output voltage values of the first power supply terminal and the second power supply terminal are different; the load group includes: at least two load units, the load units do not restrict the current direction, each load unit is provided with a first connection terminal and a second connection terminal; the second connection terminal of one load unit is connected to the first power supply terminal or the second power supply terminal, the first connection terminals of all load units are grounded through the first switch group, the second connection terminal of one load unit in two adjacent load units is connected to the first connection terminal or the second connection terminal of another load unit through the second switch group, the first switch group and the second switch group control all load units to be connected in series or in parallel; the second connection terminal of the load unit connected to the first power supply terminal or the second power supply terminal is the output terminal of the adjustable current load drive circuit for testing, and the connection indicator circuit is connected in parallel with the load unit.
[0007] Preferably, the first switch group includes: switch SW11, switch SW12, switch SW13 and switch SW14, the first terminals of switch SW11, switch SW12, switch SW13 and switch SW14 are all grounded, and the second terminals of switch SW11, switch SW12, switch SW13 and switch SW14 are respectively connected to the first connection terminal of the load unit.
[0008] Preferably, the first switch group includes: a single-pole double-throw switch SW31, a single-pole double-throw switch SW32, a single-pole double-throw switch SW33, and a single-pole double-throw switch SW34. The first moving terminals of the single-pole double-throw switches SW31, SW32, SW33, and SW34 are all grounded. The second moving terminals of the single-pole double-throw switches SW31, SW32, SW33, and SW34 are all left unused. The stationary terminals of the single-pole double-throw switches SW31, SW32, SW33, and SW34 are respectively connected to the first connection terminal of the load unit.
[0009] Preferably, the second switch group includes: a single-pole double-throw (SPDT) switch SW21, a single-pole double-throw (SPDT) switch SW22, and a single-pole double-throw (SPDT) switch SW23; a single-pole double-throw (SPDT) switch SW21, a single-pole double-throw (SPDT) switch SW22, a single-pole double-throw (SPDT) switch SW23, or a single-pole double-throw (SPDT) switch SW24 is provided between two adjacent load units; in the two adjacent load units, one load unit is a first load unit, and the other load unit is a second load unit; the second connection terminal of the first load unit is connected to the stationary terminal of the single-pole double-throw (SPDT) switch SW21 and the single-pole double-throw (SPDT) switch SW24. The stationary terminal of switch SW22, single-pole double-throw switch SW23, or single-pole double-throw switch SW24; the first connection terminal of the second load unit is connected to the first moving terminal of single-pole double-throw switch SW21, single-pole double-throw switch SW22, or single-pole double-throw switch SW23; the second connection terminal of the second load unit is connected to the second moving terminal of single-pole double-throw switch SW21, single-pole double-throw switch SW22, single-pole double-throw switch SW23, or single-pole double-throw switch SW24.
[0010] Preferably, the on-indication circuit includes: a bidirectional diode D1 and a resistor R5. The first end of the bidirectional diode D1 is connected to the first connection terminal of the load unit, the second end of the bidirectional diode D1 is connected to the first end of the resistor R5, the second end of the resistor R5 is connected to the second connection terminal of the load unit, and the second end of the resistor R5 and the first end of the bidirectional diode D1 are connected to the same load unit.
[0011] Preferably, the first power supply terminal of the adjustable DC power supply outputs a 24V voltage, and the second power supply terminal of the adjustable DC power supply outputs a 12V voltage.
[0012] Compared with the prior art, the present invention has the following beneficial effects:
[0013] In this application, by adjusting the first and second switch groups, all load units can be connected in series or in parallel. The output current is different after series and parallel connection, thereby enabling different current inputs to the pins of the controller under test, which facilitates testing the current capability of the pins of the controller under test.
[0014] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description
[0015] Figure 1 The circuit block diagram for testing the adjustable current load drive circuit.
[0016] Figure 2 This is a circuit diagram of an adjustable current load drive circuit for testing when loads are connected in parallel, as described in the first embodiment.
[0017] Figure 3 This is a circuit diagram of an adjustable current load drive circuit for testing when the loads are connected in series in the first embodiment.
[0018] Figure 4 This is a circuit diagram of an adjustable current load drive circuit for testing when loads are connected in parallel, as described in the second embodiment.
[0019] Figure 5 This is a circuit diagram of an adjustable current load drive circuit for testing when the load is connected in series in the second embodiment.
[0020] Figure 6 Circuit diagram for an adjustable DC power supply. Detailed Implementation
[0021] To make the technical means, creative features, achieved objectives and functions of this utility model clearer and easier to understand, the utility model will be further described below with reference to the accompanying drawings and specific embodiments:
[0022] like Figure 1As shown, this utility model discloses a test adjustable current load drive circuit, including: an adjustable DC power supply, a load group, a first switch group, a second switch group, and a turn-on indicator circuit; the adjustable DC power supply is provided with a first power supply terminal and a second power supply terminal, and the output voltage values VCC of the first power supply terminal and the second power supply terminal are different; the load group includes: at least two load units, the load units do not restrict the current direction, and each load unit is provided with a first connection terminal and a second connection terminal; the second connection terminal of one load unit is connected to the first power supply terminal or the second power supply terminal, the first connection terminals of all load units are grounded through the first switch group, and the second connection terminal of one load unit in two adjacent load units is connected to the first connection terminal or the second connection terminal of another load unit through the second switch group, the first switch group and the second switch group control all load units to be connected in series or in parallel; the second connection terminal of the load unit connected to the first power supply terminal or the second power supply terminal is the output terminal of the test adjustable current load drive circuit, and the turn-on indicator circuit is connected in parallel with the load unit.
[0023] The load units can be represented as: resistor R1, resistor R2, resistor R3 and resistor R4 respectively.
[0024] As one embodiment of this application, such as Figure 2 as well as Figure 3 As shown, the first switch group includes switches SW11, SW12, SW13, and SW14. The first terminals of switches SW11, SW12, SW13, and SW14 are all grounded. The second terminals of switches SW11, SW12, SW13, and SW14 are respectively connected to the first connection terminals of the load unit. The first connection terminal of resistor R4 is grounded through switch SW11, the first connection terminal of resistor R3 is grounded through switch SW12, the first connection terminal of resistor R2 is grounded through switch SW13, and the first connection terminal of resistor R1 is grounded through switch SW14. By adjusting switches SW11, SW12, SW13, and SW14, resistors R1, R2, R3, and R4 can be connected to ground in parallel, creating an opportunity for parallel connection. Of course, when connected in series, the first connection terminal of one of the resistors R1, R2, R3, and R4 needs to be grounded to achieve grounding after series connection. In this embodiment, whether in series or parallel connection, the switch SW11 connected to resistor R4 must be closed for normal power supply. Figure 2 As shown, when connected in series, switch SW11 is closed, and switches SW12, SW13, and SW14 are open. Subsequent adjustments to single-pole double-throw (SPD) switches SW21, SW22, and SW23 ensure that resistors R1, R2, R3, and R4 are connected in series. Figure 1As shown, when connected in parallel, switch SW11 is closed, and switches SW12, SW13, and SW14 are also closed. The first connection terminals of resistors R1, R2, R3, and R4 are all grounded. Subsequently, single-pole double-throw switches SW21, SW22, and SW23 are adjusted to connect the second connection terminals of resistors R1, R2, R3, and R4 together, forming a parallel connection. Assuming the output voltage of the first or second power supply terminal is VCC, then after series connection...
[0025] As another embodiment of this application, such as Figure 4 as well as Figure 5 As shown, the first switch group includes: a single-pole double-throw switch SW31, a single-pole double-throw switch SW32, a single-pole double-throw switch SW33, and a single-pole double-throw switch SW34. The first moving terminals of the single-pole double-throw switches SW31, SW32, SW33, and SW34 are all grounded. The second moving terminals of the single-pole double-throw switches SW31, SW32, SW33, and SW34 are all unused. The stationary terminals of the single-pole double-throw switches SW31, SW32, SW33, and SW34 are respectively connected to the first connection terminal of the load unit. This implementation differs from the previous implementation in that the switches used in the first switch group are different, and when connected in series, the stationary terminals of single-pole double-throw (SPD) switches SW31, SW32, SW33, and SW34 are all connected to the second moving terminal. That is, SPD switches SW31, SW32, SW33, and SW34 are left unused, which does not affect the series connection. This series connection method is as follows: Figure 4 As shown, parallel connection as Figure 3 As shown.
[0026] In this embodiment, the second switch group includes: a single-pole double-throw (SPD) switch SW21, a single-pole double-throw (SPD) switch SW22, and a single-pole double-throw (SPD) switch SW23; a single-pole double-throw (SPD) switch SW21, a single-pole double-throw (SPD) switch SW22, a single-pole double-throw (SPD) switch SW23, or a single-pole double-throw (SPD) switch SW24 is provided between two adjacent load units; in the two adjacent load units, one load unit is a first load unit, and the other load unit is a second load unit; the second connection terminal of the first load unit is connected to the stationary terminal of the single-pole double-throw (SPD) switch SW21 and the single-pole double-throw (SPD) switch SW24. The stationary terminal of switch SW22, single-pole double-throw switch SW23, or single-pole double-throw switch SW24; the first connection terminal of the second load unit is connected to the first moving terminal of single-pole double-throw switch SW21, single-pole double-throw switch SW22, or single-pole double-throw switch SW23; the second connection terminal of the second load unit is connected to the second moving terminal of single-pole double-throw switch SW21, single-pole double-throw switch SW22, single-pole double-throw switch SW23, or single-pole double-throw switch SW24. The second terminal of resistor R4 is connected to the stationary terminal of single-pole double-throw switch SW21. The first moving terminal of single-pole double-throw switch SW21 is connected to the first terminal of resistor R3. The second moving terminal of single-pole double-throw switch SW21 is connected to the second terminal of resistor R3. The second terminal of resistor R3 is connected to the stationary terminal of single-pole double-throw switch SW22. The first moving terminal of single-pole double-throw switch SW22 is connected to the first terminal of resistor R2. The second moving terminal of single-pole double-throw switch SW22 is connected to the second terminal of resistor R2. The second terminal of resistor R2 is connected to the stationary terminal of single-pole double-throw switch SW23. The first moving terminal of single-pole double-throw switch SW23 is connected to the first terminal of resistor R1. The second moving terminal of single-pole double-throw switch SW23 is connected to the second terminal of resistor R1. The second terminal of resistor R1 is connected to either the first power supply terminal or the second power supply terminal.
[0027] In the above process, the output current is different after series connection and parallel connection, thus realizing different input currents to the pins of the controller under test, which facilitates testing the current capability of the pins of the controller under test.
[0028] Preferably, the power-on indicator circuit includes a bidirectional diode D1 and a resistor R5. The first terminal of the bidirectional diode D1 is connected to the first connection terminal of the load unit, and the second terminal of the bidirectional diode D1 is connected to the first terminal of the resistor R5. The second terminal of the resistor R5 is connected to the second connection terminal of the load unit, and the second terminal of the resistor R5 and the first terminal of the bidirectional diode D1 are connected to the same load unit. Since there may be current commutation issues after series and parallel connections, a bidirectional diode D1 is used to ensure that regardless of the current direction, the circuit indicates that power is on as long as it is connected.
[0029] In this application, the first power supply terminal of the adjustable DC power supply outputs a 24V voltage, and the second power supply terminal outputs a 12V voltage. This is to meet the different voltage requirements of different pins of the controller under test.
[0030] like Figure 6 As shown, the adjustable DC power supply includes: a transformer TR1, a rectifier bridge BR1, a first buck regulator module, and a second buck regulator module. The first end of the first coil of transformer TR1 is connected to the live wire of the mains, and the second end of the first coil of transformer TR1 is connected to the neutral wire of the mains. The first end of the second coil of transformer TR1 is connected to the first input terminal of rectifier bridge BR1, and the second end of the second coil of transformer TR1 is connected to the second input terminal of rectifier bridge BR1. The positive output terminal of rectifier bridge BR1 is connected to the input terminal of the first buck regulator module, and the output terminal of the first buck regulator module is connected to the input terminal of the second buck regulator module. The output terminal of the first buck regulator module is the first power supply terminal of the adjustable DC power supply, and the output terminal of the second buck regulator module is the second power supply terminal of the adjustable DC power supply. The first power supply terminal of the adjustable DC power supply outputs a 24V voltage, and the second power supply terminal outputs a 12V voltage.
[0031] The adjustable DC power supply has its first power supply terminal connected to the first moving terminal of a single-pole double-throw (SPCD) switch, and its second power supply terminal connected to the second moving terminal of the same switch. The stationary terminal of the SPCD switches supplies power to the load unit. Therefore, by adjusting the SPCD switches, the output voltage can be adjusted to 24V or 12V.
[0032] The first buck regulator module can use the LM317 buck regulator chip U1, but other models of buck regulator chips can also be used. The second buck regulator module can use the LM1117 buck regulator chip U2, but other models of buck regulator chips can also be used.
[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.
Claims
1. A test-use adjustable current load drive circuit, characterized in that, include: Adjustable DC power supply, load group, first switch group, second switch group, and on / off indicator circuit; The adjustable DC power supply has a first power supply terminal and a second power supply terminal, and the output voltage values of the first power supply terminal and the second power supply terminal are different. The load group includes: at least two load units, the load units do not restrict the current direction, and each load unit is provided with a first connection terminal and a second connection terminal; A load unit’s second connection terminal is connected to a first power supply terminal or a second power supply terminal. All load units’ first connection terminals are grounded through a first switch group. In two adjacent load units, one load unit’s second connection terminal is connected to the first connection terminal or the second connection terminal of another load unit through a second switch group. The first switch group and the second switch group control all load units to be connected in series or in parallel. The second connection terminal of the load unit connected to the first power supply terminal or the second power supply terminal is the output terminal of the adjustable current load drive circuit for testing, and the connection indicator circuit is connected in parallel with the load unit.
2. The adjustable current for testing load drive circuit according to claim 1, characterized in that, The first switch group includes: switch SW11, switch SW12, switch SW13 and switch SW14. The first terminals of switch SW11, switch SW12, switch SW13 and switch SW14 are all grounded. The second terminals of switch SW11, switch SW12, switch SW13 and switch SW14 are respectively connected to the first connection terminal of the load unit.
3. The adjustable current for testing load drive circuit according to claim 1, characterized in that, The first switch group includes: a single-pole double-throw switch SW31, a single-pole double-throw switch SW32, a single-pole double-throw switch SW33, and a single-pole double-throw switch SW34. The first moving terminals of the single-pole double-throw switches SW31, SW32, SW33, and SW34 are all grounded. The second moving terminals of the single-pole double-throw switches SW31, SW32, SW33, and SW34 are all unused. The stationary terminals of the single-pole double-throw switches SW31, SW32, SW33, and SW34 are respectively connected to the first connection terminal of the load unit.
4. A test adjustable current load drive circuit according to claim 2 or 3, characterised in that, The second switch group includes: single-pole double-throw switch SW21, single-pole double-throw switch SW22 and single-pole double-throw switch SW23; A single-pole double-throw switch SW21, SW22, SW23 or SW24 is installed between two adjacent load units; In two adjacent load units, one load unit is the first load unit, and the other load unit is the second load unit; the second connection terminal of the first load unit is connected to the stationary terminal of single-pole double-throw switch SW21, SW22, SW23, or SW24; the first connection terminal of the second load unit is connected to the first moving terminal of single-pole double-throw switch SW21, SW22, or SW23; the second connection terminal of the second load unit is connected to the second moving terminal of single-pole double-throw switch SW21, SW22, SW23, or SW24.
5. The adjustable current for testing load drive circuit according to claim 4, characterized in that, The on / off indicator circuit includes a bidirectional diode D1 and a resistor R5. The first end of the bidirectional diode D1 is connected to the first connection terminal of the load unit, the second end of the bidirectional diode D1 is connected to the first end of the resistor R5, and the second end of the resistor R5 is connected to the second connection terminal of the load unit. The second end of the resistor R5 and the first end of the bidirectional diode D1 are connected to the same load unit.
6. The adjustable current for testing load drive circuit of claim 1, wherein, The first power supply terminal of the adjustable DC power supply outputs 24V voltage, and the second power supply terminal of the adjustable DC power supply outputs 12V voltage.