CN219802155U - Heavy-current slow-start switching circuit for laser - Google Patents
Heavy-current slow-start switching circuit for laser Download PDFInfo
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- CN219802155U CN219802155U CN202320907800.6U CN202320907800U CN219802155U CN 219802155 U CN219802155 U CN 219802155U CN 202320907800 U CN202320907800 U CN 202320907800U CN 219802155 U CN219802155 U CN 219802155U
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- 239000003990 capacitor Substances 0.000 claims description 22
- 230000011664 signaling Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000003071 polychlorinated biphenyls Chemical class 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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Abstract
The utility model discloses a heavy-current slow-start switch circuit for a laser, which comprises: the device comprises a power supply unit, a control unit, a signal unit, a driving unit and an output unit; according to the slow start switch circuit provided by the utility model, the MOS tube is used for slowly starting the switch circuit, so that the output voltage is gradually increased until the output voltage is consistent with the input voltage, the switch circuit of the traditional laser is prevented from being changed to the highest voltage at the closing moment, the interference of impact current is greatly reduced, the influence of the interference such as jitter and burrs generated at the switching moment on a later-stage circuit is weakened, and the safety of the circuit is improved.
Description
Technical Field
The utility model relates to a high-current slow-start switch circuit for a laser, and belongs to the technical field of laser direct-writing exposure equipment.
Background
In the manufacture of PCBs, semiconductors, etc., a substrate is typically exposed using an exposure apparatus, wherein the light source of the exposure apparatus is typically derived from a laser. At present, the maximum power of the existing laser is generally below 50W, 24v power supply is adopted, the total current is less than 12A, a power supply circuit adopts a switch series connection mode, when the switch is disconnected, the power supply is cut off, and when the switch is pressed down, the power supply circuit is connected to conduct electricity.
With the improvement of the performance requirement of exposure equipment, the maximum power requirement of the laser is continuously improved, so that the total current is also required to be continuously improved, the contact resistance of the switch is generally between 20MΩ and 50MΩ, according to the electric power formula p=i2r (I is total current, and R is switch contact resistance), with the improvement of the current I, the electric power P of the switch is geometrically improved, the power consumed on the switch is converted into heat energy, the larger the power is, the switch generates heat and is overlarge in loss, the switch contacts generate electric arcs, the melting contacts cause the switch to be incapable of breaking power supply, jitter is generated, burr interference affects the subsequent-stage circuit and the like.
Disclosure of Invention
In order to solve the above problems, the present utility model provides a high-current slow start switching circuit for a laser, comprising: the device comprises a power supply unit, a control unit, a signal unit, a driving unit and an output unit; the signal unit is used for providing a switching signal and controlling whether the power supply unit supplies power or not;
the control unit includes: the first resistor R1, the second resistor R2, the first capacitor C1 and the first MOS tube Q1; the first resistor R1 and the first capacitor C1 are connected with the grid electrode and the source electrode of the first MOS tube Q1 in a bridging mode, one end of the second resistor R2 is connected with the grid electrode of the first MOS tube Q1, and the other end of the second resistor R2 is connected with the triode Q4 of the driving unit;
the driving unit includes: the fourth resistor R4, the fifth resistor R5, the second capacitor C2 and the triode Q4; one end of the fourth resistor R4 is connected with the signal unit, and the other end of the fourth resistor R4 is respectively connected with the triode Q4, the fifth resistor R5 and the second capacitor C2; the other ends of the fifth resistor R5 and the second capacitor C2 are grounded, the collector C of the triode Q4 is connected with the second resistor R2, the base B is connected with the fourth resistor R4, and the emitter E is grounded.
In one embodiment, the first MOS transistor Q1 is further connected to a plurality of MOS transistors sequentially, where a gate, a source, and a drain of each MOS transistor are all connected in parallel to a gate, a source, and a drain of a previous MOS transistor, and the number of the MOS transistors is adjusted according to the output power of the circuit.
In one embodiment, the signal unit includes: and (3) a switch.
In one embodiment, the circuit further comprises an indicator light unit for use as a circuit output indicator light.
In one embodiment, the indicator light unit includes: an LED lamp.
The utility model has the advantages that:
according to the slow start switch circuit provided by the utility model, the MOS tube is used for slowly starting the switch circuit, so that the output voltage is gradually increased until the output voltage is consistent with the input voltage, the condition that the traditional switch circuit is changed to the highest voltage at the closing moment is avoided, the interference of impact current is greatly reduced, the influence of the interference such as jitter and burrs generated at the switching moment on a later-stage circuit is weakened, and the safety of the circuit is improved.
Drawings
FIG. 1 is a block diagram showing the overall circuit unit structure of the present utility model.
Fig. 2 is a circuit configuration diagram of the present utility model.
Detailed Description
The present utility model will be described in detail below.
Example 1
As shown in FIG. 1, the utility model relates to a high-current slow start switch circuit for a laser, which comprises a power supply unit, a control unit, a signal unit, a driving unit, an output unit and an indicator lamp unit; the signal unit is used for providing a switching signal and controlling whether the power supply unit supplies power or not;
as shown in fig. 2, which is a circuit configuration diagram of the present embodiment, the slow start switch circuit of the present embodiment is composed of resistors R1, R2, R3, R4, R5, capacitors C1, C2, a signal lamp LED1, and MOS transistors. The MOS tube is an insulated gate field effect tube, is also the most critical device of the circuit, and can adjust the quantity according to the output power required.
The control unit of the present embodiment includes: the first resistor R1, the second resistor R2, the first capacitor C1 and the first MOS tube Q1; the first resistor R1 and the first capacitor C1 are connected with the grid electrode and the source electrode of the first MOS tube in a bridging mode, one end of the second resistor R2 is connected with the grid electrode of the first MOS tube, and the other end of the second resistor R2 is connected with the triode Q4 of the driving unit;
the first MOS tube Q1 is also connected with two MOS tubes Q2 and Q3 which are sequentially connected, wherein the grid electrodes, the source electrodes and the drain electrodes of the MOS tubes Q2 and Q3 are all connected in parallel with the grid electrodes, the source electrodes and the drain electrodes of the former MOS tube, and the number of the MOS tubes is adjusted according to the output power of the circuit.
The driving unit of the present embodiment includes: the fourth resistor R4, the fifth resistor R5, the second capacitor C2 and the triode Q4; one end of the fourth resistor R4 is connected with the signal unit, and the other end of the fourth resistor R4 is respectively connected with the base B of the triode Q4, the fifth resistor R5 and the second capacitor C2; the other ends of the fifth resistor R5 and the second capacitor C2 are grounded; the collector C of the triode Q4 is connected with the second resistor R2, the base B is connected with the fourth resistor R4, and the emitter E is grounded.
In the circuit of this embodiment, the resistors R1, R2 and the capacitor C1 form a voltage division type RC time constant circuit, and the capacitor C1 is connected in parallel between the GS poles of the MOS transistor, that is, vc1=vgs. When the power is just on, the capacitor C1 is not charged, vgs=0, the MOS tube is not conducted, and no output is generated at the later stage.
The current on the circuit switch is determined by the resistors R4 and R5 and the triode Q4, and the current on the UA level and the loss on the switch can be basically ignored according to an ohm formula and an electric power formula because the resistors R4 and R5 generally take the value KΩ level.
When the switch is pressed down, the signal is connected to the B pole of the transistor Q4 through the resistors R4 and R5 and the capacitor C2, and the transistor is conducted. At this time, the resistors R1 and R2 charge the capacitor C1, and when the voltage of the capacitor C1 reaches Vth, the MOS starts to be turned on, and this stage is completed by the function of delayed power-up, and the delay time can be estimated by the following equation:
Uc1＝Vin*R1/(R1+R2)[1-exp(-T/t)]
where T is the delay time, τ\tau tau is the time constant of the RC circuit, τ\tau = C1 (R1// R2), vth is typically 4V.
After the MOS tube starts to be conducted, vgs continues to increase, rds is rapidly reduced, and the output voltage of slow start is gradually increased until the output voltage is basically consistent with the input voltage.
The back-end circuit starts to work, and the single board is powered on formally. In this process, the output voltage does not jump instantaneously to the highest, and therefore, the disturbance of the rush current is greatly reduced.
The resistor R3 and the signal lamp LED1 form the circuit output indicator lamp in the embodiment.
According to the slow start switch circuit, the MOS tube is used for slowly starting the switch circuit, so that the output voltage is gradually increased until the output voltage is consistent with the input voltage, the phenomenon that the traditional switch circuit is changed to the highest voltage in the closing moment is avoided, the interference of impact current is greatly reduced, the influence of the interference such as jitter and burrs generated in the switching moment on a later-stage circuit is weakened, and the safety of the circuit is improved.
While the utility model has been described with reference to the preferred embodiments, it is not limited thereto, and various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the utility model as defined in the appended claims.
Claims (5)
1. A high current slow start switching circuit for a laser, the circuit comprising: the device comprises a power supply unit, a control unit, a signal unit, a driving unit and an output unit; the signal unit is used for providing a switching signal and controlling whether the power supply unit supplies power or not;
the control unit includes: the first resistor R1, the second resistor R2, the first capacitor C1 and the first MOS tube Q1; the first resistor R1 and the first capacitor C1 are connected with the grid electrode and the source electrode of the first MOS tube Q1 in a bridging mode, one end of the second resistor R2 is connected with the grid electrode of the first MOS tube Q1, and the other end of the second resistor R2 is connected with the triode Q4 of the driving unit;
the driving unit includes: the fourth resistor R4, the fifth resistor R5, the second capacitor C2 and the triode Q4; one end of the fourth resistor R4 is connected with the signal unit, and the other end of the fourth resistor R4 is respectively connected with the triode Q4, the fifth resistor R5 and the second capacitor C2; the other ends of the fifth resistor R5 and the second capacitor C2 are grounded, the collector C of the triode Q4 is connected with the second resistor R2, the base B is connected with the fourth resistor R4, and the emitter E is grounded.
2. The high-current slow start switch circuit for a laser according to claim 1, wherein the first MOS tube Q1 is further connected with a plurality of MOS tubes which are sequentially connected, wherein the grid electrode, the source electrode and the drain electrode of each MOS tube are all connected in parallel with the grid electrode, the source electrode and the drain electrode of the previous MOS tube, and the number of the MOS tubes is adjusted according to the output power of the circuit.
3. The high current slow start switching circuit for a laser as set forth in claim 1, wherein the signal unit includes: and (3) a switch.
4. The high current slow start switching circuit for a laser of claim 1, further comprising an indicator light unit for use as an output indicator light of the circuit.
5. The high current slow start switching circuit for a laser of claim 4, wherein the indicator light unit comprises: an LED lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320907800.6U CN219802155U (en) | 2023-04-21 | 2023-04-21 | Heavy-current slow-start switching circuit for laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320907800.6U CN219802155U (en) | 2023-04-21 | 2023-04-21 | Heavy-current slow-start switching circuit for laser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219802155U true CN219802155U (en) | 2023-10-03 |
Family
ID=88153224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320907800.6U Active CN219802155U (en) | 2023-04-21 | 2023-04-21 | Heavy-current slow-start switching circuit for laser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219802155U (en) |
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2023
- 2023-04-21 CN CN202320907800.6U patent/CN219802155U/en active Active
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