Multi-mode dimming device based on brightness proportion ratio and two-color temperature adjustment

Abstract

This utility model discloses a multi-mode dimming device based on brightness ratio and dual color temperature adjustment, including a microcontroller control module, a Bluetooth module, a dimming enable module, a color temperature adjustment module, a brightness distribution module, and a low-voltage power supply module. The microcontroller control module has a 6-speed switch and a 5-speed switch. When the 6-speed switch is in the first position, the microcontroller controls the dimming mode as Bluetooth dimming. The microcontroller outputs the upper ratio PWM and CCTPWM based on the Bluetooth output and outputs the corresponding PWM to the brightness distribution and color temperature adjustment modules to control the upper and lower brightness distribution and color temperature. When in other positions, the microcontroller controls the dimming mode as 0-10V dimming. The microcontroller outputs the corresponding PWM signal to the brightness distribution and color temperature adjustment modules based on the position of the 6-speed and 5-speed switches. The microcontroller controls the 5-speed brightness distribution and 5-speed color temperature adjustment respectively through the two switches.

Description

Technical Field

[0001] This utility model belongs to the field of LED control circuit technology, specifically relating to a multi-mode dimming device based on brightness ratio and dual color temperature adjustment. Background Technology

[0002] Most lighting fixtures on the market nowadays have the function of emitting light from both the top and bottom simultaneously. The technical solution they use is generally parallel power supply, which connects the upper and lower light panels directly to the same power output terminal. However, this has the disadvantage of not being able to independently control the brightness and color temperature of the upper and lower parts of the light fixture. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the inventor, based on his rich experience in the field of control circuit technology, has developed a multi-mode dimming device based on brightness ratio dual color temperature adjustment.

[0004] To achieve the above technical objectives, this utility model adopts the following technical solution: a multi-mode dimming device based on brightness ratio and dual color temperature adjustment, comprising a microcontroller control module, a Bluetooth module, a dimming enable module, a color temperature adjustment module, a brightness allocation module, and a low-voltage power supply module. The microcontroller control module is equipped with a 6-position DIP switch, each of which is connected to a resistor with a different resistance value. The 6 different resistors and a fixed resistor divide the 3.3V voltage into 6 intervals. Pin 14 of the microcontroller control module acquires and reads the voltage through an ADC. If the voltage is determined to be in the V6 interval, Bluetooth dimming is activated. The microcontroller control module is connected to the color temperature adjustment module and the brightness allocation module.

[0005] Furthermore, the PWM output from the microcontroller control module is connected to the collector of Q15 via R102, R110 is connected between the base and emitter of Q15, the emitter of Q15 is connected to D-GND via R117, R17 is connected to pins 1 and 2 of optocoupler U10, R116 is connected between the gate and source of Q17, the 12V+ signal is connected to the drain of Q17 via R108, the reverse dimming enable signal is connected to the drain of Q17, and then connected to the base of Q16 via R103. The BLE-Dim-PWM output from the Bluetooth module is connected to the collector of Q16 via R104, R111 is connected between the base and emitter of Q16, and the emitter of Q16 is connected to D-GND via R117.

[0006] Furthermore, when controlled by the Bluetooth module, pin 9 of the microcontroller control module is at a low level, and dimming is controlled by the Bluetooth module. The brightness distribution signal and color temperature adjustment signal are filtered by RC filter into analog signals of corresponding amplitude. The microcontroller control module controls the brightness distribution according to the voltage value V10 of pin 10 collected by the ADC, and outputs it at pin 6 of the microcontroller control module. The higher the duty cycle of the output at pin 6, the longer the conduction time of the upper lamp board, and the higher the brightness. Conversely, the lower the duty cycle, the lower the brightness of the lamp board.

[0007] Furthermore, the microcontroller control module acquires the voltage V11 at pin 11, and adjusts the color temperature of the upper and lower light-emitting modules by outputting PWM at pins 8 and 12 respectively. Pin 8 outputs the PWM for adjusting the color temperature of the upper light, and pin 10 outputs the PWM for adjusting the color temperature of the lower light, which are then transmitted to the brightness distribution module and the color temperature adjustment module through an optocoupler.

[0008] Furthermore, when the microcontroller control module reads a voltage between V1 and V5, pin 9 of the microcontroller control module outputs a high level. Depending on the read voltage, pin 6 of the microcontroller outputs a different duty cycle to control the brightness distribution. The required brightness ratio is set in the program.

[0009] Based on the voltage range detected by the ADC at pin 14 of the microcontroller control module, the corresponding PWM is output at pin 8 and pin 10 of the microcontroller control module. The cool color temperature ratio is set by the level read from pin 14 of the microcontroller control module and the output duty cycle of pin 6. It can be set to 5 levels to control the five levels of brightness distribution and five levels of color temperature adjustment.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1. The dimming mode can be selected through a DIP switch, and it is compatible with both 0-10V dimming and Bluetooth dimming. The output and control parts of the two dimming modes share the same components, which significantly reduces the component cost. Brightness distribution and color temperature adjustment can be achieved in both Bluetooth dimming and 0-10V dimming modes, which solves the problem of difficulty in coordinating the control of color temperature adjustment, brightness distribution and dimming mode in lighting systems.

[0012] 2. Brightness distribution and color temperature adjustment are achieved by controlling the conduction and cutoff of 6 MOSFETs. The corresponding level can be selected by adjusting the DIP switch to select 0-10V dimming and Bluetooth dimming. The dimming enable module uses fewer components and shares isolation components. In Bluetooth dimming, stepless brightness distribution and color temperature ratio can be achieved. Five levels of brightness distribution and color temperature adjustment can be achieved in 0-10V dimming. Attached Figure Description

[0013] Figure 1 This is the circuit schematic diagram of this utility model.

[0014] Figure 2 This is a simplified diagram of the brightness allocation and color temperature adjustment module.

[0015] Figure 3 This is a timing diagram for the control of the brightness allocation and color temperature adjustment modules.

[0016] Figure 4 This is a schematic diagram of the brightness allocation module.

[0017] Figure 5 This is a schematic diagram of the color temperature adjustment module.

[0018] Figure 6 This is a schematic diagram of a microcontroller control module.

[0019] Figure 7 This is a schematic diagram of the dimming enable module.

[0020] Figure 8 This is a schematic diagram of a Bluetooth module. Detailed Implementation

[0021] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0022] like Figures 1-8 As shown, a multi-mode dimming device based on brightness ratio and dual color temperature adjustment includes a microcontroller control module, a Bluetooth module, a dimming enable module, a color temperature adjustment module, a brightness allocation module, and a low-voltage power supply module. Pin 9 of the microcontroller control module outputs a signal to the gate of the dimming enable module Q17. Pin 9 of the microcontroller control module is also connected to the base of Q15 via R101. The 3.3V power supply generated by the low-voltage power supply module is connected to the Bluetooth module and the microcontroller control module. The microcontroller control module is equipped with a 6-position DIP switch, each with 6 different resistors. These 6 different resistors, along with a fixed resistor, divide the 3.3V voltage into 6 intervals. Pin 14 of the microcontroller control module reads the voltage via an ADC. If the voltage is determined to be in the V6 interval, Bluetooth dimming is activated. The microcontroller control module is connected to the color temperature adjustment module and the brightness allocation module.

[0023] In this embodiment, the PWM output by the dimming enable module is connected to the collector of Q15 through R102, R110 is connected between the base and emitter of Q15, the emitter of Q15 is connected to D-GND through R117, R17 is connected to pins 1 and 2 of optocoupler U10, R116 is connected between the gate and source of Q17, the 12V+ signal is connected to the drain of Q17 through R108, the reverse dimming enable signal is connected to the drain of Q17, and then connected to the base of Q16 through R103.

[0024] The dimming enable module works as follows: When the output of pin 9 of the microcontroller control module is high, Q17 is turned on, and the reverse dimming enable signal is pulled low. The voltage between the base and emitter of Q15 is divided by R101 and R110, and the divided voltage is sufficient for Q15 to turn on. At this time, the PWM signal flowing through the optocoupler U10 is the signal output by the dimming conversion module, which is controlled by the dimming conversion circuit to drive the constant current drive module for dimming. When the output of pin 9 of the microcontroller control module is low, Q17 is turned off, and the reverse dimming enable signal is high. The voltage between the base and emitter of Q16 is divided by R103 and R111, and the divided voltage is sufficient for Q16 to turn on. At this time, the PWM signal flowing through the optocoupler U10 is the signal output by Bluetooth, which is controlled by Bluetooth to drive the constant current drive module for dimming.

[0025] In this embodiment, when Bluetooth dimming is enabled, pin 9 of the microcontroller control module is at a low level, and dimming is controlled by the Bluetooth module. The brightness allocation signal and color temperature adjustment signal are filtered by RC filter into analog signals of corresponding amplitude. The microcontroller control module controls the brightness allocation according to the voltage value V10 of pin 10 collected by the ADC. The output is made at pin 6 of the microcontroller control module. The higher the duty cycle of the output at pin 6, the longer the conduction time of the upper lamp board, and the higher the brightness. Conversely, the lower the duty cycle, the lower the brightness of the lamp board.

[0026] The duty cycle of pin 6 of the microcontroller control module is Duty Cycle(6)(%)=(V10 / 3.3)×100, the duty cycle of pin 8 of the microcontroller control module is Duty Cycle(8)(%)=(V11 / 3.3)×100×(V10 / 3.3)×100, and the duty cycle of pin 10 of the microcontroller control module is Duty Cycle(10)(%)=(V10 / 3.3)×100+(1-(V10 / 3.3)×100)×(V11 / 3.3)×100.

[0027] In this embodiment, the microcontroller control module collects the voltage V11 at pin 11 and adjusts the color temperature of the upper and lower light-emitting modules by outputting PWM at pins 8 and 12 respectively. Pin 8 outputs the PWM for adjusting the color temperature of the upper light and pin 10 outputs the PWM for adjusting the color temperature of the lower light, which is then transmitted to the brightness distribution module and the color temperature adjustment module through an optocoupler.

[0028] In this embodiment, when the microcontroller control module reads that the voltage is between V1 and V5, the output of pin 9 of the microcontroller control module is high. The brightness distribution is controlled by the different duty cycles output of pin 6 of the microcontroller according to the different voltages of V1-V5. The required brightness ratio can be set in the program.

[0029] In this embodiment, the voltage read by pin 15 of the microcontroller control module is 5 different voltages. Based on the voltage range detected by the ADC through pin 14 of the microcontroller, the corresponding PWM is output at pin 8 and pin 10 of the microcontroller control module. The proportion of cool color temperature is set by the level read by pin 14 of the microcontroller control module, which is set to 5 levels to control the five levels of color temperature adjustment.

[0030] like Figure 1 , Figure 4 , Figure 5As shown, the main circuit structure of the brightness distribution module and color temperature adjustment module is as follows: the positive terminals of the upper warm-colored, upper cool-colored, lower warm-colored, and lower cool-colored LED strings are connected to the output LED+ of the constant current drive module; the negative terminal of the upper warm-colored LED string is connected to the drain of Q1; the negative terminal of the upper cool-colored LED string is connected to the drain of Q2; the negative terminal of the lower warm-colored LED string is connected to the drain of Q8; the negative terminal of the lower cool-colored LED string is connected to the drain of Q10; and the signal Upperbrightness is output by the microcontroller control module. The allocation-PWM is connected to pin 1 of optocoupler U3. Pin 2 of optocoupler U3 is grounded through resistor R70. Pin 4 of optocoupler U3 is connected to 15V. Pin 3 of optocoupler U3 is connected to the gate of Q13 through resistor R68. R72 is connected between the gate and source of Q13. The sources of Q11, Q13, Q7, and Q9 are all connected to LED-. 15V is connected to the gates of Q9 and Q7 through resistors R48 and R54, respectively. R50 and R45 are connected between the gate and source of Q9 and Q7, respectively. The gate of Q7 is connected to the drain of Q13 through resistor R61. The drain of Q13 is connected to the gate of Q11 via R63, and the gate of Q9 is connected to the drain of Q11 via R57. R66 is connected between the gate and source of Q11. The UP-C-PWM signal output from the microcontroller control module is connected to pin 1 of optocoupler U1. Pin 2 of optocoupler U1 is connected to ground via resistor R34. Pin 4 of optocoupler U1 is connected to 15V. Pin 3 of optocoupler U1 is connected to the gate of Q5 via R33. R38 is connected between the gate and source of Q5. The sources of Q1, Q2, Q4, and Q5 are all connected to the drain of Q9. The 15V is connected to R66 via R7. 18. R21 is connected to the gates of Q2 and Q1. R19 and R15 are connected between the gates and sources of Q2 and Q1, respectively. The gate of Q1 is connected to the drain of Q5 via R30. The drain of Q5 is connected to the gate of Q4 via R31. The gate of Q2 is connected to the drain of Q4 via R26. R32 is connected between the gate and source of Q4. The output signal DOWN-C-PWM from the microcontroller control module is connected to pin 1 of optocoupler U4. Pin 2 of optocoupler U4 is connected to ground via resistor R71. Pin 4 of optocoupler U4 is connected to 15V. Pin 3 of optocoupler U4 is connected to... R69 is connected to the gate of Q14. R73 is connected between the gate and source of Q14. The sources of Q8, Q10, Q12, and Q14 are all connected to the drain of Q7. 15V is connected to the gates of Q10 and Q8 through R49 and R55 respectively. R51 and R46 are connected between the gates and sources of Q10 and Q8 respectively. The gate of Q8 is connected to the drain of Q14 through R62. The drain of Q14 is connected to the gate of Q12 through R14. The gate of Q10 is connected to the drain of Q12 through R58. R67 is connected between the gate and source of Q12.

[0031] Its working principle is as follows: First, the microcontroller control module outputs PWM signals with different duty cycles to pin 1 of optocoupler U3 based on the detected signal. When the microcontroller control module outputs a high level, current flows through the LED of the optocoupler, causing the secondary winding of the optocoupler to conduct. The conduction voltage drop of the secondary winding of the optocoupler is very small. At this time, the gate and source voltage of Q13 can be approximated by the voltage divider of 15V by R72 and R68, approximately 7.5V, which is sufficient for Q13 to conduct. The conduction voltage drop of Q13 is very low, which is the same as the gate and source voltage of Q11. Q11 is cut off. The gate and source voltage of Q7 can be approximated by the voltage divider of 15V by R72 and R68, resulting in a very low voltage, so Q7 is cut off. The gate and source voltage of Q9 is the voltage divider of 15V by R54 and R61. The gate and source voltage is sufficient for Q9 to conduct. At this time, the negative terminal of the upper lamp board is connected to the constant voltage through Q9. For the current-driven LED-, when the microcontroller control module outputs a high level, Q9 conducts and Q7 is cut off; when the microcontroller control module outputs a low level, no current flows through the LED of the optocoupler, the secondary side of the optocoupler is cut off, the gate-source voltage of Q13 is 0V, Q13 is cut off, the gate-source voltage of Q7 and Q11 is approximately equal to the voltage divided by R66 and R45 in parallel with R54 for 15V, the gate-source voltage is sufficient for Q7 and Q11 to conduct. At this time, the negative terminal of the lower lamp board is connected to the constant current driven LED- through Q7, and the gate-source voltage of Q9 is approximately equal to the voltage divided by R47 and R58 for 15V, the voltage is very low, Q9 is cut off. That is, when the microcontroller control module outputs a low level, Q7 conducts and Q9 is cut off. The working principle of upper and lower color temperature adjustment is the same as the circuit principle of brightness distribution, but color temperature adjustment has a prerequisite, namely Upper When both brightness allocation-PWM and UP-C-PWM are high, Q2 is on and Q1 is off. When Upper brightness allocation-PWM is high and UP-C-PWM is low, Q1 is on and Q2 is off. When Upper brightness allocation-PWM is low and DOWN-C-PWM is high, Q10 is on and Q8 is off. When both Upper brightness allocation-PWM and DOWN-NC-PWM are low, Q8 is on and Q10 is off. Because the color temperature adjustment module needs to be controlled based on the brightness allocation module, Q7 is equivalent to the master switch on the lower lamp board. Only when Q7 is on is the conduction of Q8 and Q10 effective. Similarly, Q9 is equivalent to the master switch on the lower lamp board. Only when Q9 is on is the conduction of Q1 and Q2 effective.

[0032] Figure 3To achieve a 50% brightness distribution between the upper and lower lamps, the CW and WW of the upper and lower lamps are each allocated 50%. A high level indicates that the MOSFET is turned on, and a low level indicates that the MOSFET is turned off. To achieve the above, the conduction time of Q9 and Q7 is first controlled, with each accounting for 50% of the conduction time, thus achieving a 50 / 50 brightness distribution. Then, the color temperature of the upper lamp is adjusted by controlling the conduction time of Q2 and Q1. It can be seen that Q2's conduction time accounts for 25%, and Q1's for 75%. However, the conduction of Q1 and Q2 is only effective when Q9 is on. Therefore, only 25% of Q1's 75% is effective. Thus, the effective conduction time of Q1 and Q2 is 50% of Q9's conduction time, meaning the upper lamp's warm and cool color proportions each account for 50%. The same applies to the lower lamp. Although Q10 accounts for 75% and Q8 for 25%, because Q7's conduction time is only the latter half of 50%, the first half of Q10's conduction time is ineffective. Therefore, the effective proportions of Q10 and Q8 are both 25%, with a total effective time of 50%. The effective proportions of Q10 and Q8 account for half of the effective time. To achieve other brightness distribution ratios and color temperature adjustments, brightness distribution must first be achieved through Q7 and Q9, and then the color temperature of the upper and lower lamps must be adjusted separately. The color temperature adjustment of the upper lamp requires controlling the conduction time of Q1 and Q2 during the conduction period of Q9, and the color temperature adjustment of the lower lamp requires controlling the conduction time of Q8 and Q10 during the conduction period of Q7.

[0033] like Figure 2 As shown, Figure 2 This is a simplified diagram of the color temperature adjustment and brightness allocation module. This diagram is more intuitive. The color temperature adjustment and brightness allocation module used in this design is... Figure 1 The circuits in the two are slightly different. Figure 2 The control signals UP-C-PWM and UP-W-PWM, DOWN-C-PWM and DOWN-W-PWM, and Lower brightness allocation-PWM and Upper brightness allocation-PWM are three pairs of complementary PWM signals. Figure 1 The color temperature adjustment and brightness distribution module has only three control signals. Through a series of circuits, each control signal is converted into two complementary signals to achieve the same function.

[0034] like Figure 2As shown, the circuit structure is as follows: the positive terminals of the upper warm-color, upper cool-color, lower warm-color, and lower cool-color LED strings are connected to the output LED+ of the constant current drive module; the negative terminal of the upper warm-color LED string is connected to the drain of Q1; the negative terminal of the upper cool-color LED string is connected to the drain of Q2; the negative terminal of the lower warm-color LED string is connected to the drain of Q8; the negative terminal of the lower cool-color LED string is connected to the drain of Q10; the sources of Q1 and Q2 are connected to the drain of Q9; the sources of Q8 and Q10 are connected to the drain of Q7; the sources of Q7 and Q9 are connected to the output LED- of the constant current drive module; and six signals, UP-C-PWM, UP-W-PWM, DOWN-C-PWM, DOWN-W-PWM, Lower brightness allocation-PWM, and Upper brightness allocation-PWM, are connected to the gates of the six MOSFETs to control their conduction.

[0035] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A multi-mode dimming device based on brightness ratio and dual color temperature adjustment, characterized in that: The system includes a microcontroller control module, a Bluetooth module, a dimming enable module, a color temperature adjustment module, a brightness distribution module, and a low-voltage power supply module. The microcontroller control module is equipped with a 6-position DIP switch, each with a different resistor. These six different resistors, along with a fixed resistor, divide the 3.3V voltage into six intervals. Pin 14 of the microcontroller control module reads the voltage via an ADC. If the voltage is in the V6 interval, Bluetooth dimming is enabled; if it is in the V1-V5 interval, 0-10V dimming is enabled. The microcontroller control module is connected to the color temperature adjustment module and the brightness distribution module to control color temperature adjustment and brightness distribution.

2. The multi-mode dimming device based on brightness ratio dual color temperature adjustment according to claim 1, characterized in that: The PWM output from the dimming enable module is connected to the collector of Q15 via R102. R110 is connected between the base and emitter of Q15. The emitter of Q15 is connected to D-GND via R117. R17 is connected to pins 1 and 2 of optocoupler U10. R116 is connected between the gate and source of Q17. The 12V+ signal is connected to the drain of Q17 via R108. The reverse dimming enable signal is connected to the drain of Q17 and then connected to the base of Q16 via R103. The BLE-Dim-PWM output from the Bluetooth module is connected to the collector of Q16 via R104. R111 is connected between the base and emitter of Q16. The emitter of Q16 is connected to D-GND via R117.

3. The multi-mode dimming device based on brightness ratio dual color temperature adjustment according to claim 1, characterized in that: When the microcontroller control module reads the voltage as V6, it is in Bluetooth dimming mode. Pin 9 of the microcontroller control module is at a low level, and dimming is controlled by the Bluetooth module. The brightness distribution signal and color temperature adjustment signal are filtered by RC filter into analog signals of corresponding amplitude. The microcontroller control module controls the brightness distribution according to the voltage value V10 at pin 10 collected by the ADC. The output is at pin 6 of the microcontroller control module. The higher the duty cycle of the output at pin 6, the longer the upper lamp board is on, and the higher the brightness. Conversely, the lower the duty cycle, the lower the brightness of the lamp board. The microcontroller control module collects the voltage V11 at pin 11 and adjusts the color temperature of the upper and lower light-emitting modules by outputting PWM at pins 8 and 12 respectively. The output at pin 8 is the PWM for adjusting the color temperature of the upper lamp, and the output at pin 10 is the PWM for adjusting the color temperature of the lower lamp. These are then sent to the brightness distribution module and the color temperature adjustment module through optocouplers.

4. The multi-mode dimming device based on brightness ratio dual color temperature adjustment according to claim 1, characterized in that: When the microcontroller control module reads that the voltage is between V1 and V5, the output of pin 9 of the microcontroller control module is high. According to the 5-position DIP switch SW1, the 3.3V voltage is divided into 5 intervals by 5 different resistors and one fixed resistor. The 3.3V voltage is divided into 5 intervals. The pin 15 of the microcontroller control module detects the voltage interval through the ADC and outputs different duty cycles at pin 6 of the microcontroller control module to control the brightness distribution. The required brightness ratio is set in the program. The voltage read from pin 15 of the microcontroller control module is one of five different voltages. Based on the voltage range detected by the ADC through pin 14 of the microcontroller control module, the corresponding PWM is output from pin 8 and pin 10 of the microcontroller control module. The proportion of cool color temperature is set by the level read from pin 14 of the microcontroller control module, with five levels, controlling five levels of brightness distribution and five levels of color temperature adjustment.

5. A multi-mode dimming device based on brightness ratio dual color temperature adjustment according to claim 1, characterized in that: The main circuit structure of the brightness distribution module and color temperature adjustment module is as follows: the positive terminals of the upper warm-colored, upper cool-colored, lower warm-colored, and lower cool-colored LED strings are connected to the output LED+ of the constant current drive module; the negative terminal of the upper warm-colored LED string is connected to the drain of Q1; the negative terminal of the upper cool-colored LED string is connected to the drain of Q2; the negative terminal of the lower warm-colored LED string is connected to the drain of Q8; and the negative terminal of the lower cool-colored LED string is connected to the drain of Q10. The signal Upper brightness output by the microcontroller control module... The allocation-PWM is connected to pin 1 of optocoupler U3. Pin 2 of optocoupler U3 is grounded through resistor R70. Pin 4 of optocoupler U3 is connected to 15V. Pin 3 of optocoupler U3 is connected to the gate of Q13 through resistor R68. R72 is connected between the gate and source of Q13. The sources of Q11, Q13, Q7, and Q9 are all connected to LED-. 15V is connected to the gates of Q9 and Q7 through resistors R48 and R54, respectively. R50 and R45 are connected between the gate and source of Q9 and Q7, respectively. The gate of Q7 is connected to the drain of Q13 through resistor R61. The drain of Q13 is connected to the gate of Q11 via R63, and the gate of Q9 is connected to the drain of Q11 via R57. R66 is connected between the gate and source of Q11. The UP-C-PWM signal output from the microcontroller control module is connected to pin 1 of optocoupler U1. Pin 2 of optocoupler U1 is connected to ground via resistor R34. Pin 4 of optocoupler U1 is connected to 15V. Pin 3 of optocoupler U1 is connected to the gate of Q5 via R33. R38 is connected between the gate and source of Q5. The sources of Q1, Q2, Q4, and Q5 are all connected to the drain of Q9. The 15V is connected to R66 via R7.

18. R21 is connected to the gates of Q2 and Q1. R19 and R15 are connected between the gates and sources of Q2 and Q1, respectively. The gate of Q1 is connected to the drain of Q5 via R30. The drain of Q5 is connected to the gate of Q4 via R31. The gate of Q2 is connected to the drain of Q4 via R26. R32 is connected between the gate and source of Q4. The output signal DOWN-C-PWM from the microcontroller control module is connected to pin 1 of optocoupler U4. Pin 2 of optocoupler U4 is connected to ground via resistor R71. Pin 4 of optocoupler U4 is connected to 15V. Pin 3 of optocoupler U4 is connected to... R69 is connected to the gate of Q14. R73 is connected between the gate and source of Q14. The sources of Q8, Q10, Q12, and Q14 are all connected to the drain of Q7. 15V is connected to the gates of Q10 and Q8 through R49 and R55 respectively. R51 and R46 are connected between the gates and sources of Q10 and Q8 respectively. The gate of Q8 is connected to the drain of Q14 through R62. The drain of Q14 is connected to the gate of Q12 through R14. The gate of Q10 is connected to the drain of Q12 through R58. R67 is connected between the gate and source of Q12.

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