90-degree phase power-on impact jig circuit

Abstract

The utility model discloses a 90-degree phase power-on impact jig circuit, which relates to the field of switching power supplies and comprises a zero-crossing detection module used for detecting voltage conditions of alternating current of commercial power and feeding back different voltage signals to a single chip microcomputer control module based on zero-crossing and non-zero-crossing conditions of the alternating current; the single chip microcomputer control module is used for selecting whether to drive the relay working module in a delayed manner or not based on the received voltage signal; the beneficial effects of the utility model are that the zero-crossing detection module detects the zero-crossing point of the alternating current and feeds back a signal to the single-chip microcomputer control module, and then the single-chip microcomputer control module controls the work of the relay work module so as to selectively drive the work of the switching power supply module. Compared with an AC Source test, the testing device has the advantages that the structure is simple, and manual operation of an experimenter is not needed.

Description

Technical Field

[0001] The utility model relates to the field of switching power supplies, in particular to a 90° phase power-on impact fixture circuit. Background Art

[0002] Currently, switching power supplies are widely used in LED lighting drivers, leading to high industry demands for their efficiency and stability. However, as circuits directly connected to the power supply, they are susceptible to inrush currents when the power is turned on. In severe cases, excessive inrush currents can damage power supply components or cause grid fluctuations.

[0003] The Inrush test is designed to verify the reliability of a switching power supply at the moment it is turned on. Typically, an AC source is used to generate a sine wave signal with a 90° starting phase for testing. However, the AC source is bulky and expensive, and requires manual operation by the experimenter, which calls for improvement. Utility Model Content

[0004] The purpose of the present invention is to provide a 90° phase electric shock fixture circuit to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A 90° phase electric shock fixture circuit, comprising:

[0007] The zero-crossing detection module is used to detect the voltage condition of the AC mains power. Based on the AC zero-crossing point and non-zero-crossing point conditions, different voltage signals are fed back to the single-chip control module;

[0008] The single chip control module is used to select whether to delay driving the relay working module based on the received voltage signal;

[0009] The relay working module is used to drive the switching power supply module to work;

[0010] Switching power supply module, used to convert AC power into DC power output;

[0011] The zero-crossing detection module is connected to the single-chip microcomputer control module, the single-chip microcomputer control module is connected to the relay working module, and the relay working module is connected to the switching power supply module.

[0012] As a further solution of the present invention: the zero-crossing detection module includes an optocoupler U3 and an amplifier U2, a first end of the optocoupler U3 is connected to one end of the resistor R22, the resistor R22, the resistor R31, and the resistor R18 are connected in series, one end of the resistor R18 is connected to the neutral line N, the second end of the optocoupler U3 is connected to one end of the resistor R24, the resistor R24, the resistor R21, and the resistor R17 are connected in series, the other end of the resistor R17 is connected to the live wire L through the fuse F1, the fourth end of the optocoupler U3 is connected to one end of the resistor R23 and the in-phase end of the amplifier U2, the other end of the resistor R23 is connected to a 3.3V voltage, the third end of the optocoupler U3 is grounded, the inverting end of the amplifier U2 is connected to one end of the resistor R27 and one end of the resistor R26, the other end of the resistor R26 is grounded, the other end of the resistor R27 is connected to a 3.3V voltage, and the output end of the amplifier U2 is connected to the single-chip microcomputer control module.

[0013] As a further solution of the present invention: the model of the amplifier U2 is LMV321TP, and the model of the optical coupler U3 is EL354.

[0014] As a further solution of the present invention: the single-chip microcomputer control module includes a single-chip microcomputer U5, the model of the single-chip microcomputer U5 is RB57F095ASF, the pin 13 of the single-chip microcomputer U5 is connected to the zero-crossing detection module, and the pin 14 of the single-chip microcomputer U5 is connected to the relay working module.

[0015] As a further solution of the present utility model: the relay working module includes a MOS tube Q1 and a relay U6, the model of the relay U6 is 507H-1AH-FS, the G pole of the MOS tube Q1 is connected to the single-chip computer control module through the resistor R29, the S pole of the MOS tube Q1 is grounded, the D pole of the MOS tube Q1 is connected to the second end of the relay U6 and the positive pole of the diode D4, the negative pole of the diode D4 is connected to the 12V voltage, the first end of the relay U6 is connected to the 12V voltage, the sixth end of the relay U6 is connected to the live wire L, the fifth end of the relay U6 is connected to one end (LED+) of the switching power input line through the fuse F2, and the other end of the switching power input line is connected to the neutral line N.

[0016] Compared with the existing technology, the beneficial effects of the present invention are: the present invention detects the zero-crossing point of the alternating current through the zero-crossing detection module, feeds back the signal to the single-chip control module, and then controls whether the relay working module is working or not through the single-chip control module to selectively drive the switching power supply module to work or not, to assist in verifying the reliability test of the switching power supply at the moment of power-on. Compared with the AC Source test, the structure is simple and does not require manual operation by the experimenter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The following is a circuit diagram of a 90° phase electric shock fixture circuit.

[0018] Figure 2 This is the circuit diagram of the switching power supply module. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] See also Figure 1 , a 90° phase electric shock fixture circuit, comprising:

[0021] The zero-crossing detection module is used to detect the voltage condition of the AC mains power. Based on the AC zero-crossing point and non-zero-crossing point conditions, different voltage signals are fed back to the single-chip control module;

[0022] The single chip control module is used to select whether to delay driving the relay working module based on the received voltage signal;

[0023] The relay working module is used to drive the switching power supply module to work;

[0024] Switching power supply module, used to convert AC power into DC power output;

[0025] The zero-crossing detection module is connected to the single-chip microcomputer control module, the single-chip microcomputer control module is connected to the relay working module, and the relay working module is connected to the switching power supply module.

[0026] In the specific embodiment: see Figure 2 , the switching power supply module is a common power supply device. Here is a specific example.

[0027] In the input circuit part, the live wire L and the neutral wire N are AC input. The fuse F1 provides overcurrent and short-circuit protection, the capacitor CX1 provides EMC common-mode filtering, R1 and R11 are bleeder resistors, the varistor MOV1 provides lightning pulse protection, the rectifier BD1 provides full-wave rectification, and the inductor L1, resistor R3, capacitor C4, and capacitor C5 provide differential-mode filtering.

[0028] The low PF filter circuit consists of resistors R4, R10, R14, R16 and capacitors EC2 and EC3.

[0029] The soft-start circuit of IC (U1) consists of R2, R9, R12, C7, and EC4. When powered on, the bypass capacitor C7 is charged through the starting resistors R2, R9, and R12. After being filtered by EC4, soft-start is achieved when the IC startup threshold voltage is reached.

[0030] The steady-state power supply circuit of IC (U1) consists of the auxiliary winding of transformer T1 (4, 5 ends) and D3 and R13.

[0031] R15, R19, and C6 provide output voltage signal feedback to achieve output overvoltage protection.

[0032] The reflected voltage spike absorption circuit is composed of R5, C1, and D2.

[0033] R20 provides primary-side current sensing for cycle-by-cycle peak current control and limitation.

[0034] The secondary side rectifier filter circuit consists of D1, EC1, and C3. C2 and R6 provide peak absorption, and R7 and R8 provide no-load discharge.

[0035] The 12V to 3.3V linear step-down voltage regulator circuit consists of IC (U4) and C10, C9, and EC5.

[0036] In this example: See Figure 1 The zero-crossing detection module includes an optocoupler U3 and an amplifier U2. The first end of the optocoupler U3 is connected to one end of the resistor R22, and the resistors R22, R31, and R18 are connected in series. One end of the resistor R18 is connected to the neutral line N. The second end of the optocoupler U3 is connected to one end of the resistor R24, and the resistors R24, R21, and R17 are connected in series. The other end of the resistor R17 is connected to the live wire L through the fuse F1. The fourth end of the optocoupler U3 is connected to one end of the resistor R23 and the non-inverting end of the amplifier U2. The other end of the resistor R23 is connected to a 3.3V voltage. The third end of the optocoupler U3 is grounded. The inverting end of the amplifier U2 is connected to one end of the resistor R27 and one end of the resistor R26. The other end of the resistor R26 is grounded. The other end of the resistor R27 is connected to a 3.3V voltage. The output end of the amplifier U2 is connected to the single-chip microcomputer control module.

[0037] In this example: See Figure 1 , the model of amplifier U2 is LMV321TP, and the model of optocoupler U3 is EL354.

[0038] The zero-crossing detection of the AC sine wave is 90° phase detection. When the AC power passes through zero, there is no voltage difference between the first and second terminals of the optocoupler U3, and the internal light-emitting diode does not emit light, so that the fourth terminal of the optocoupler U4 is high, and the amplifier U2 outputs a high level. Conversely, when the AC power does not pass through zero, the internal light-emitting diode of the optocoupler U3 emits light, the internal phototransistor of the optocoupler U3 is turned on, the fourth terminal of the optocoupler U3 is low, and the amplifier U2 outputs a low level. Therefore, the zero-crossing detection module outputs a narrow pulse signal of several hundred μs when the AC input passes through zero.

[0039] In this example: See Figure 1 The single-chip microcomputer control module includes a single-chip microcomputer U5. The model of the single-chip microcomputer U5 is RB57F095ASF. Pin 13 of the single-chip microcomputer U5 is connected to the zero-crossing detection module, and pin 14 of the single-chip microcomputer U5 is connected to the relay working module.

[0040] Microcontroller U5 uses a 50µs timer interrupt to continuously monitor the zero-crossing pulse signal on pin 13. Once a high level is detected, it delays the signal for a time period t1 to generate a high level signal on pin 14. In this embodiment, the microcontroller uses the WT peripheral clock. When pin 14 outputs a high level signal for 5 seconds, it flips the output level to a low level. After another 5 seconds, it retests the zero-crossing pulse signal, repeating this cycle. Setting the delay time for a microcontroller is a common technique and does not involve any innovative approach.

[0041] In this example: See Figure 1 The relay working module includes a MOS tube Q1 and a relay U6. The model of the relay U6 is 507H-1AH-FS. The G pole of the MOS tube Q1 is connected to the single-chip computer control module through the resistor R29. The S pole of the MOS tube Q1 is grounded. The D pole of the MOS tube Q1 is connected to the second end of the relay U6 and the positive pole of the diode D4. The negative pole of the diode D4 is connected to the 12V voltage. The first end of the relay U6 is connected to the 12V voltage. The sixth end of the relay U6 is connected to the live wire L. The fifth end of the relay U6 is connected to one end (LED+) of the switching power input line through the fuse F2. The other end of the switching power input line is connected to the neutral line N.

[0042] When a high level is input, the MOS tube Q1 is turned on, so that the coils inside the first and second ends of the relay U6 are energized and work, and the internal switch is adsorbed and closed, so that the live wire L, the internal switch of the relay U6, the fuse F2, the switching power input line, and the neutral line N form a loop. The switching power input line is energized to supply power to the switching power supply module, and the switching power supply module works for testing.

[0043] The working principle of the utility model is as follows: the zero-crossing detection module is used to detect the voltage condition of the AC mains, and based on the two conditions of the AC zero-crossing point and the non-zero-crossing point, different voltage signals are fed back to the single-chip control module; the single-chip control module is used to select whether to delay driving the relay working module based on the received voltage signal; the relay working module is used to drive the switching power supply module to work when working; and the switching power supply module is used to convert the AC power into a DC power output.

[0044] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as exemplary and non-restrictive.

[0045] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A 90° phase electric shock fixture circuit, characterized in that: The 90° phase electric shock fixture circuit includes: The zero-crossing detection module is used to detect the voltage condition of the AC mains power. Based on the AC zero-crossing point and non-zero-crossing point conditions, different voltage signals are fed back to the single-chip control module; The single chip control module is used to select whether to delay driving the relay working module based on the received voltage signal; The relay working module is used to drive the switching power supply module to work; Switching power supply module, used to convert AC power into DC power output; The zero-crossing detection module is connected to the single-chip microcomputer control module, the single-chip microcomputer control module is connected to the relay working module, and the relay working module is connected to the switching power supply module.

2. The 90° phase electric shock fixture circuit according to claim 1, characterized in that: The zero-crossing detection module includes an optocoupler U3 and an amplifier U2. The first end of the optocoupler U3 is connected to one end of the resistor R22, and the resistors R22, R31, and R18 are connected in series. One end of the resistor R18 is connected to the neutral line N. The second end of the optocoupler U3 is connected to one end of the resistor R24, and the resistors R24, R21, and R17 are connected in series. The other end of the resistor R17 is connected to the live wire L through the fuse F1. The fourth end of the optocoupler U3 is connected to one end of the resistor R23 and the in-phase end of the amplifier U2. The other end of the resistor R23 is connected to a 3.3V voltage. The third end of the optocoupler U3 is grounded. The inverting end of the amplifier U2 is connected to one end of the resistor R27 and one end of the resistor R26. The other end of the resistor R26 is grounded. The other end of the resistor R27 is connected to a 3.3V voltage. The output end of the amplifier U2 is connected to the single-chip microcomputer control module.

3. The 90° phase electric shock fixture circuit according to claim 2, characterized in that: The model of amplifier U2 is LMV321TP, and the model of optocoupler U3 is EL354.

4. The 90° phase electric shock fixture circuit according to any one of claims 1 to 3, characterized in that: The single-chip microcomputer control module includes a single-chip microcomputer U5. The model of the single-chip microcomputer U5 is RB57F095ASF. Pin 13 of the single-chip microcomputer U5 is connected to the zero-crossing detection module, and pin 14 of the single-chip microcomputer U5 is connected to the relay working module.

5. The 90° phase electric shock fixture circuit according to claim 1, characterized in that: The relay working module includes a MOS tube Q1 and a relay U6. The model of the relay U6 is 507H-1AH-FS. The G pole of the MOS tube Q1 is connected to the single-chip computer control module through the resistor R29, the S pole of the MOS tube Q1 is grounded, the D pole of the MOS tube Q1 is connected to the second end of the relay U6 and the positive pole of the diode D4, the negative pole of the diode D4 is connected to the 12V voltage, the first end of the relay U6 is connected to the 12V voltage, the sixth end of the relay U6 is connected to the live wire L, the fifth end of the relay U6 is connected to one end of the switching power input line through the fuse F2, and the other end of the switching power input line is connected to the neutral line N.

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