Circuit for switching a load circuit with mos transistors and light source, stage light provided with same

Abstract

This utility model relates to the field of stage lighting, and more specifically, to a circuit using MOSFETs to switch load circuits and a light source or stage light equipped with such a circuit. The circuit includes a first driving terminal, a second driving terminal, several parallel loads, several electronic switch modules corresponding to the lines of each load, and a control module for controlling the electronic switch modules. The control module independently controls the on / off state of the circuit of each load through the electronic switch modules. A closed-loop power supply is formed by the first and second driving terminals. The parallel loads enable independent switching of different effects among the loads. The electronic switch modules control the switching of the lines of each load. The control module sends command signals to each electronic switch module to control the on / off state of the lines of each load, thereby improving the drive utilization rate of the load circuit.

Description

Technical Field

[0001] This utility model relates to the field of stage lighting, and more specifically, to a circuit that uses a MOSFET to switch load circuits and a light source and stage lighting equipped with such a circuit. Background Technology

[0002] With the development of commerce, commercial lighting equipment is constantly being upgraded, and demand is continuously increasing. In commercial lighting engineering projects, the design of the light output effect and circuit design of the lighting equipment are very important parts of the entire project. Switching the effects of the light source itself, such as changing the color rendering index, color temperature, and color, or switching the power supply between multiple different modules, all require a switching circuit.

[0003] For low-current switching circuits below 1A, commonly used switching chips include the SM2213EK chip from Mingwei Electronics. Its principle is to control the switching and on / off of the circuit by changing the internal circuit connections. The advantage is high integration, but it is not conducive to heat dissipation, cannot handle large currents, and the number of load paths is fixed. If not all paths are used, the drive utilization rate is also low. (See attached diagram.) Figure 1 .

[0004] Another approach is to use multiple drivers for switching. This method allows multiple workloads to work together, but it is costly and bulky due to the use of multiple drivers. For single-load or low-load applications, some drivers will inevitably be unused, resulting in low driver utilization. (See attached image.) Figure 2 .

[0005] For applications requiring high current, frequent switching, quiet operation, and high drive utilization, such as dual-display LED light sources with lens switching, only one set of LEDs with different color temperatures will be used at any given time, requiring a suitable switching circuit. Utility Model Content

[0006] This invention aims to overcome at least the defects (deficiencies) of the prior art mentioned above, and provides a circuit for switching load circuits using MOSFETs and a stage light equipped with such a circuit. This is to solve the problem of low drive utilization caused by unused loads still conducting, as well as the problems of high current and noise caused by the use and frequent switching of different loads, which in turn shorten the lifespan of the stage light due to load switching.

[0007] The technical solution adopted by this utility model is to provide a circuit for switching load circuits using MOSFETs, which includes a first driving terminal, a second driving terminal, a plurality of parallel loads, a plurality of electronic switch modules corresponding to the lines of each load, and a control module for controlling the plurality of electronic switch modules. The control module independently controls the circuit on / off of each load through the plurality of electronic switch modules.

[0008] The power supply forms a closed loop through the first and second drive terminals. The parallel loads enable independent switching of each load to achieve different effects. The electronic switch module controls the switching of the line of each load. The control module sends command signals to each electronic switch module to realize the on / off of the line of each load, thereby improving the drive utilization rate on the load circuit.

[0009] Furthermore, each electronic switch module includes a MOS transistor gate drive circuit and a MOS transistor output circuit. The MOS transistor output circuit is located on the line corresponding to each load. The MOS transistor gate drive circuit is used to receive control signals from the control module to control the on / off state of the MOS transistor output circuit.

[0010] The MOSFET gate drive circuit receives command signals from the control module and sends a signal to the MOSFET output circuit to control the switching of the MOSFET, enabling switching between lines with different loads. The connection between the MOSFET gate drive circuit and the MOSFET output circuit improves the drive utilization rate and the adaptability to large currents when switching loads. The fast conduction speed, small size, and low switching noise of the MOSFET enable this electronic switch module to accelerate the switching speed, reduce the installation size, and extend the service life in multi-load application scenarios.

[0011] Furthermore, the MOS transistor gate drive circuit includes an input filter circuit, a buck circuit, a voltage sampling circuit, an output filter circuit, and an ENA terminal. The input filter circuit is connected to the voltage input terminal of the buck circuit, which reduces the input voltage to the voltage of the output on / off signal. The voltage sampling circuit feeds back the driving voltage of the MOS transistor output circuit to the buck circuit to change the voltage of its output on / off signal. The output filter circuit is connected to the voltage output terminal of the buck circuit, and the ENA terminal is used to output the on / off signal to the MOS transistor output circuit.

[0012] The input filter circuit removes low-frequency and high-frequency noise from the power supply voltage; the step-down circuit reduces the input power supply voltage to the output signal voltage, and the output filter circuit removes low-frequency and high-frequency interference from the output signal voltage; the voltage sampling circuit achieves stable voltage output and sets the gain, and changing the resistance value in the voltage sampling circuit can adjust the output signal voltage to adapt to the driving voltage required by different MOSFETs; the ENA terminal serves as the on / off signal transmission port, transmitting the on / off signal from the MOSFET gate drive circuit to the MOSFET output circuit.

[0013] Furthermore, the input filtering circuit includes a power supply terminal, the step-down circuit includes a chip unit, the voltage sampling circuit includes a feedback terminal and an indicator terminal, the power supply terminal is connected to the voltage input terminal of the chip unit, the ENA terminal is connected to the voltage output terminal of the chip unit, the output filtering circuit is connected between the chip unit and the ENA terminal, the feedback terminal is connected to the feedback input terminal of the chip unit, and the indicator terminal is connected to the indicator input terminal of the chip unit.

[0014] The power supply terminal provides the input voltage to the chip unit; the chip unit receives signals from the control module, processes them, and sends different on / off signals to the ENA terminal for each load line; the feedback terminal feeds back the different drive voltages of different MOSFETs to the chip unit; the indicator terminal synchronously samples and monitors the output signal voltage of the chip unit and the corresponding drive voltages of different MOSFETs to determine the voltage stability.

[0015] Furthermore, the chip unit includes an EN pin for receiving control signals from the control module, an SW pin for outputting on / off signals to the ENA terminal, an FB pin for forming feedback signals from the output on / off signals and transmitting them to the ENA terminal to form closed-loop control, a VIN pin for connecting to the power supply terminal, and two GND pins for grounding.

[0016] The EN and SW pins are used for signal input and output in the chip unit, respectively; the FB pin is used for signal feedback in the chip unit; the VIN pin is used to stabilize the input voltage of the chip unit; and the GND pin is used to ground the chip unit.

[0017] Furthermore, the chip unit is model TD1663, and the surface-mount diode in the step-down circuit is model SK2BA.

[0018] By using specific chip units and surface-mount diodes, the step-down circuit can switch between different loads to maintain the stability and efficiency of the output on / off signal.

[0019] Furthermore, the first driving terminal is the positive driving output terminal, the second driving terminal is the negative driving output terminal, the output terminal of the MOS transistor output circuit is connected to the negative driving output terminal, the input terminal of the MOS transistor output circuit is connected to one end of the load, and the other end of the load is connected to the positive driving output terminal.

[0020] A voltage supply circuit is formed by a MOSFET output circuit with a positive drive output and a negative drive output connected in parallel, and a load connected in parallel. Each load corresponds to a MOSFET output circuit connected in series, so as to control the on and off of different MOSFET output circuits to switch the on and off of different loads, thereby improving the drive utilization rate.

[0021] Furthermore, each MOSFET output circuit includes a MOSFET, a current-limiting resistor, and a filter circuit. The gate of the MOSFET is connected to the MOSFET gate drive circuit, the source of the MOSFET is connected to the negative terminal of the drive output, the drain of the MOSFET is connected to the load, the current-limiting resistor is connected between the gate of the MOSFET and the MOSFET gate drive circuit, and the filter circuit is connected between the source and the drain of the MOSFET.

[0022] The response speed of the switching circuit is improved by using a MOSFET; the input voltage of the MOSFET output circuit and the output signal voltage of the MOSFET gate drive circuit are adjusted by using a current-limiting resistor, thereby receiving different output on / off signals corresponding to different loads; the output signal is processed by a filter circuit to remove interference and noise, so as to achieve stable transmission of the output on / off signal.

[0023] Preferably, a light source is also provided, comprising at least two sets of light-emitting units emitting different spectra, one set of the light-emitting units forming one load, the load being independently controlled by the circuit using a MOS transistor to switch the load loop.

[0024] Different light-emitting units within the light source are used to display different requirements in terms of color rendering index, color temperature, and DUV value, thus meeting the flexible needs of displaying various light-emitting effects and improving the flexibility of high-current application scenarios. The load formed by each light-emitting unit enables stable operation control of each load, improving the stability of the light-emitting unit's light-emitting effect. The electronic switching module enables independent control of different loads under different effects, thereby improving the control precision of the light-emitting unit, reducing noise caused by frequent load switching, and extending the lifespan of the light source.

[0025] Preferably, a stage light is also provided, comprising a chassis base, a support arm pivotally connected to the chassis base, and a lamp head pivotally connected to the support arm, the lamp head including the light source.

[0026] Powered by the chassis base, the lamp head is supported by the support arm for turning, different individual light source effects are displayed through the lamp head, and the effect changes of the stage lights are displayed by switching the light sources, thus extending the life of the stage lights.

[0027] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0028] 1) By connecting loads in parallel, each load can be independently switched to achieve different effects, improving the stability and accuracy of the effect control of different loads; by using electronic switch modules, the circuit of each load can be controlled and switched, improving the drive utilization rate when switching loads and the adaptability to high current; by using control modules to turn each electronic switch module on and off, the drive utilization rate on the load circuit can be improved; by using the characteristics of MOSFETs in the electronic switch modules, the electronic switch modules can accelerate the switching speed, reduce the installation size, and extend the service life in multi-load application scenarios.

[0029] 2) By using light-emitting units, the flexibility of the light source in different high-current application scenarios is improved. By using electronic switch modules, the stability and control precision of the light-emitting effect of the light-emitting units are enhanced, the driving utilization rate of the light-emitting units is increased, the noise caused by frequent switching of the light-emitting units is reduced, and the service life of the light source is extended.

[0030] 3) Different individual light source effects can be displayed through the lamp head, and the effect changes of the stage lights can be controlled by switching the light sources, thus extending the service life of the stage lights. Attached Figure Description

[0031] Figure 1 This is the first prior art solution of this utility model.

[0032] Figure 2 This is the second prior art solution of this utility model.

[0033] Figure 3 This is a circuit diagram of the present invention for switching load circuits using a MOSFET.

[0034] Figure 4 This is a connection diagram of the MOS transistor gate drive circuit of this utility model.

[0035] Figure 5 This is a connection diagram of the MOS transistor output circuit of this utility model.

[0036] Figure 6 This is a schematic diagram of the layout of the light-emitting units in the light source of this utility model.

[0037] Figure 7 This is a schematic diagram of the stage lamp of this utility model.

[0038] Figure 8 This is a schematic diagram of the installation of the light source and its driver board in the stage lamp of this utility model.

[0039] Figure 9 This is an enlarged schematic diagram of the driver board in the stage light of this utility model.

[0040] Explanation of reference numerals in the attached diagram: Lamp head 10, support arm 20, chassis base 30, light source 100, first light-emitting unit 110, second light-emitting unit 120, driver board 200, ENA terminal 211, ENB terminal 212, ENC terminal 213, output filter circuit 214, voltage sampling circuit 215, step-down circuit 216, input filter circuit 217, first load control line 221, second load control line 222, third load control line 223. Detailed Implementation

[0041] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this invention. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0042] Example 1

[0043] like Figure 1-5 As shown, this embodiment provides a circuit for switching load circuits using MOSFETs, which includes a first driving terminal, a second driving terminal, several parallel loads, several electronic switch modules corresponding to the lines of each load, and a control module for controlling the several electronic switch modules. The control module independently controls the circuit on / off of each load through the several electronic switch modules.

[0044] In this embodiment, the first driving terminal is a positive terminal of a driving output, and the second driving terminal is a negative terminal of a driving output; several parallel loads are connected one-to-one with several electronic switch modules to form a load control circuit connected in parallel in sequence. The load control circuit is connected between the positive and negative terminals of the driving output to form a load control loop; the control module includes one module, which is connected to the load control loop and sends signals to realize the on / off control of different loads in the load control loop.

[0045] Each electronic switch module includes a MOSFET gate drive circuit and a MOSFET output circuit. The MOSFET output circuit is located on the line corresponding to each load. The MOSFET gate drive circuit is used to receive control signals from the control module to control the on / off state of the MOSFET output circuit.

[0046] In this embodiment, the electronic switch module includes a MOSFET gate drive circuit and a MOSFET output circuit connected in series. The gate of the MOSFET in the MOSFET gate drive circuit is connected to the gate of the MOSFET in the MOSFET output circuit. The MOSFET gate drive circuit controls the on / off state of the MOSFET output circuit by outputting an ENA signal, thereby controlling the on / off state of the load controlled by the MOSFET output circuit.

[0047] The MOS transistor gate drive circuit includes an input filter circuit 217, a step-down circuit 216, a voltage sampling circuit 215, an output filter circuit 214, and an ENA terminal 211. The input filter circuit 217 is connected to the voltage input terminal of the step-down circuit 216. The step-down circuit 216 reduces the input voltage to the voltage of the output on / off signal. The voltage sampling circuit 215 feeds back the driving voltage of the MOS transistor output circuit to the step-down circuit 216 to change the voltage of its output on / off signal. The output filter circuit 214 is connected to the voltage output terminal of the step-down circuit 216. The ENA terminal 211 is used to output the on / off signal to the MOS transistor output circuit.

[0048] In this embodiment, the step-down circuit 216 includes a chip unit U8.4 and peripheral circuitry of the chip unit U8.4, which reduces the input voltage to the output ENA voltage. The peripheral circuitry includes an RC circuit located at the signal input terminal of the chip unit, used to remove low-frequency and high-frequency power supply noise; a surface-mount diode D1 located at the signal output terminal of the chip unit and an RC circuit connected in parallel across it, used to remove low-frequency and high-frequency output interference, including a series resistor R4 and capacitor C7; and a parallel resistor R1 and capacitor C3 at the signal input terminal. The chip unit is model TD1663, the surface-mount diode D1 is model SK2BA, R4 is 10R 0603, C7 is 101 50V, R1 is 100K0603, and C3 is 102 50V.

[0049] The input filtering circuit 217 includes a power supply terminal, the step-down circuit 216 includes a chip unit, and the voltage sampling circuit 215 includes a feedback terminal and an indicator terminal. The power supply terminal is connected to the voltage input terminal of the chip unit, the ENA terminal 211 is connected to the voltage output terminal of the chip unit, the output filtering circuit 214 is connected between the chip unit and the ENA terminal 211, the feedback terminal is connected to the feedback input terminal of the chip unit, and the indicator terminal is connected to the indicator input terminal of the chip unit.

[0050] In this embodiment, the power supply terminal is connected to the power input terminal of the chip unit. The power supply terminal and ground terminal are connected to the power input terminal of the chip unit, and a through-hole aluminum electrolytic capacitor CE1 and capacitors C1 and C2 are connected in parallel between the power supply terminal and the ground terminal. CE1 is 47uF / 63V, C1 is 224 100V, and C2 is 103 100V. The output filter circuit 214 includes a through-hole aluminum electrolytic capacitor CE2 and capacitor C8 connected in parallel between the output terminal and the ground terminal of the chip unit. CE1 is 47uF / 63V, and C8 is 103 100V. The step-down circuit 216 includes an ENA terminal 211, which is a signal output connected between the gate (G) of the MOSFET in the MOSFET output circuit and the chip unit. The voltage sampling circuit 215 includes resistors R5, R6, and R7 connected in parallel. Resistor R5 is connected between the feedback terminal and the indicator terminal, resistor R7 is connected between the feedback terminal and the ground terminal, and resistor R6 is connected between the feedback terminal and the ground terminal. Changing the resistance values ​​of R5, R6, and R7 can change the output ENA voltage to adapt to different MOSFETs. R5 is 100K 0603, R6 is 47K 0603, and R7 is 12K4 0603.

[0051] The chip unit includes an EN pin for receiving control signals from the control module, an SW pin for outputting on / off signals to the ENA terminal 211, an FB pin for forming feedback signals from the output on / off signals and transmitting them to the ENA terminal 211 to form closed-loop control, a VIN pin for connecting to the power supply, and two GND pins for grounding.

[0052] In this embodiment, a capacitor C4 is connected in parallel between the BST pin 1 and the SW pin 8 in the chip unit U8.4. C4 is 104100V. The VIN pin 2 is connected to the input filter circuit 217. A capacitor C3 and a resistor R1 are connected in parallel between the EN pin 3 and the GND pin 9. C3 is 10250V and R1 is 100K 0603. A resistor R2 is connected in parallel between the RT pin 4 and the GND pin 9. R2 is 49K 0603. A capacitor C5 is provided between the FB pin 5 and the ground terminal. C5 is NC. The voltage sampling circuit 215 is connected between the FB pin 5 and the capacitor C5. The PGOOD pin 6 is connected to the ground terminal. A resistor R3 is connected between the PGOOD pin 6 and the ENA terminal 211. R3 is 100K 0603±1%. A surface-mount diode D1 is connected in parallel between the SW pin 8 and the GND pin 7. A resistor R4 and a capacitor C7 are connected in series across the two ends of the surface-mount diode D1. D1 is SK2BA and R4 is 10R. 0603, C7 is 101 50V; there is an inductor L1 between SW pin 8 and the output filter circuit 214, L1 is 47uH 1.75A.

[0053] The chip unit is model TD1663, and the surface mount diode in the step-down circuit 216 is model SK2BA.

[0054] In this embodiment, the chip unit is U8.4, model number TD1663; the surface mount diode in the step-down circuit 216 is D1, model number SK2BA.

[0055] The first driving terminal is the positive driving output terminal, the second driving terminal is the negative driving output terminal, the output terminal of the MOS transistor output circuit is connected to the negative driving output terminal, the input terminal of the MOS transistor output circuit is connected to one end of the load, and the other end of the load is connected to the positive driving output terminal.

[0056] In this embodiment, several MOSFET output circuits are connected in parallel, including a first load control line 221, a second load control line 222, and a third load control line 223. The input terminal of the first load control line 221 is the ENA terminal 211, which is connected to the MOSFET gate drive circuit. The output terminal of the first load control line 221 is connected to load A, and the on / off state of load A is controlled by the switching on / off state of the MOSFET output circuit. The input terminal of the second load control line 222 is the ENB terminal 212, which is connected to the MOSFET gate drive circuit. The output terminal of the first load control line 221 is connected to load B, and the on / off state of load B is controlled by the switching on / off state of the MOSFET output circuit. The input terminal of the third load control line 223 is the ENC terminal 213, which is connected to the MOSFET gate drive circuit. The output terminal of the first load control line 221 is connected to load C, and the on / off state of load C is controlled by the switching on / off state of the MOSFET output circuit.

[0057] Each MOSFET output circuit includes a MOSFET, a current-limiting resistor, and a filter circuit. The gate of the MOSFET is connected to the MOSFET gate drive circuit, the source of the MOSFET is connected to the negative terminal of the drive output, and the drain of the MOSFET is connected to the load. The current-limiting resistor is connected between the gate of the MOSFET and the MOSFET gate drive circuit, and the filter circuit is connected between the source and the drain of the MOSFET.

[0058] In this embodiment, the first load control line 221 includes a MOS transistor Q1.1 connected to the ENA terminal 211. The MOS transistor Q1.1 is an N-channel MOS transistor, and a current-limiting resistor R1.1 is provided between its gate and the ENA terminal 211. A resistor R2.1 and a capacitor C1.1 are connected in series between the source and drain of the MOS transistor Q1.1 to form a filter circuit. Q1.1 is 40A 100V, R1.1 is 10R 0805, R2.1 is 10R0805, and C1.1 is 103 100V. The second load control circuit 222 includes a MOSFET Q1.2 connected to the ENB terminal 212. The MOSFET Q1.2 is an N-channel MOSFET. A current-limiting resistor R1.2 is provided between its gate and the ENB terminal 212. A resistor R2.2 and a capacitor C1.2 are connected in series between the source and drain of the MOSFET Q1.2 to form a filter circuit. Q1.2 is 40A 100V, R1.2 is 10R 0805, R2.2 is 10R 0805, and C1.2 is 103 100V. The third load control circuit 223 includes a MOSFET Q1.3 connected to the ENC terminal 213. The MOSFET Q1.3 is an N-channel MOSFET. A current-limiting resistor R1.3 is provided between its gate and the ENC terminal 213. A filter circuit consisting of a resistor R2.3 and a capacitor C1.3 is connected in series between the source and drain of the MOSFET Q1.3. Q1.3 is 40A 100V, R1.3 is 10R 0805, R2.3 is 10R 0805, and C1.3 is 103 100V.

[0059] Example 2

[0060] A light source 100 is also provided, comprising at least two sets of light-emitting units emitting different spectra, one set of the light-emitting units forming one load, the load being independently controlled by the circuit using a MOS transistor to switch the load loop.

[0061] In this embodiment, the first light-emitting unit 110 and the second light-emitting unit 120 may have different color temperatures, different color rendering indices, or different DUV values. The arrangement of the two light-emitting units and the circuit connecting them using MOS transistors to switch the load circuit are as follows: Figure 6 As shown.

[0062] Example 3

[0063] like Figure 7-9 As shown, a stage light is also provided, which includes a chassis base 30, a support arm 20 pivotally connected to the chassis base 30, and a lamp head 10 pivotally connected to the support arm 20, the lamp head 10 including the light source 100.

[0064] In this embodiment, the circuit for switching the load circuit using a MOSFET is mounted on the driver board 200.

[0065] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the technical solution of this utility model, and are not intended to limit the specific implementation of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. Circuit for switching a load circuit with MOS transistors, characterized in that, It includes a first driving end, a second driving end, several parallel loads, several electronic switch modules corresponding to the lines of each load, and a control module for controlling the several electronic switch modules. The control module independently controls the circuit on / off of each load through the several electronic switch modules.

2. The circuit for switching load circuits using a MOSFET according to claim 1, characterized in that, Each electronic switch module includes a MOSFET gate drive circuit and a MOSFET output circuit. The MOSFET output circuit is located on the line corresponding to each load. The MOSFET gate drive circuit is used to receive control signals from the control module to control the on / off state of the MOSFET output circuit.

3. The circuit for switching load circuits using a MOSFET according to claim 2, characterized in that, The MOS transistor gate drive circuit includes an input filter circuit, a buck circuit, a voltage sampling circuit, an output filter circuit, and an ENA terminal. The input filter circuit is connected to the voltage input terminal of the buck circuit, which reduces the input voltage to the voltage of the output on / off signal. The voltage sampling circuit feeds back the driving voltage of the MOS transistor output circuit to the buck circuit, thereby changing the voltage of its output on / off signal. The output filter circuit is connected to the voltage output terminal of the buck circuit, and the ENA terminal is used to output the on / off signal to the MOS transistor output circuit.

4. The circuit for switching load circuits using a MOSFET according to claim 3, characterized in that, The input filtering circuit includes a power supply terminal, the step-down circuit includes a chip unit, and the voltage sampling circuit includes a feedback terminal and an indicator terminal. The power supply terminal is connected to the voltage input terminal of the chip unit, the ENA terminal is connected to the voltage output terminal of the chip unit, the output filtering circuit is connected between the chip unit and the ENA terminal, the feedback terminal is connected to the feedback input terminal of the chip unit, and the indicator terminal is connected to the indicator input terminal of the chip unit.

5. The circuit for switching load circuits using a MOSFET according to claim 4, characterized in that, The chip unit includes an EN pin for receiving control signals from the control module, an SW pin for outputting on / off signals to the ENA terminal, an FB pin for forming feedback signals from the output on / off signals and transmitting them to the ENA terminal to form closed-loop control, a VIN pin for connecting to the power supply terminal, and two GND pins for grounding.

6. The circuit for switching load circuits using a MOSFET according to claim 3, characterized in that, The chip unit is model TD1663, and the surface-mount diode in the step-down circuit is model SK2BA.

7. The circuit for switching load circuits using a MOSFET according to claim 2, characterized in that, The first driving terminal is the positive driving output terminal, the second driving terminal is the negative driving output terminal, the output terminal of the MOS transistor output circuit is connected to the negative driving output terminal, the input terminal of the MOS transistor output circuit is connected to one end of the load, and the other end of the load is connected to the positive driving output terminal.

8. The circuit for switching load circuits using a MOSFET according to claim 7, characterized in that, Each MOSFET output circuit includes a MOSFET, a current-limiting resistor, and a filter circuit. The gate of the MOSFET is connected to the MOSFET gate drive circuit, the source of the MOSFET is connected to the negative terminal of the drive output, and the drain of the MOSFET is connected to the load. The current-limiting resistor is connected between the gate of the MOSFET and the MOSFET gate drive circuit, and the filter circuit is connected between the source and the drain of the MOSFET.

9. A light source, characterized in that, It includes at least two sets of light-emitting units emitting different spectra, one set of the light-emitting units forming one load, and the load is independently controlled by the circuit of any one of claims 1-8 that uses a MOS transistor to switch the load circuit.

10. A stage light, characterized in that, It includes a chassis base, a support arm pivotally connected to the chassis base, and a lamp head pivotally connected to the support arm, the lamp head including the light source as described in claim 9.

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