An ultrasonic glasses case control circuit

Abstract

The utility model discloses an ultrasonic wave glasses box control circuit, including full bridge drive module, transformer T2, LC module, ultrasonic transducer module and feedback control module, full bridge drive module includes full bridge drive chip U3 and opposite unit, and full bridge drive chip U3 has IN1 end, IN2 end, NSLEEP end, OUT1 end and OUT2 end, IN2 end connects first power supply voltage, OUT1 end and OUT2 end connect the primary winding of transformer T2, and the one end of LC module connects the secondary winding of transformer T2, and one end of ultrasonic transducer module connects LC module, feedback control module has positive input, negative input, power supply input and output, and the other end of ultrasonic transducer module is connected to positive input, and the other end of secondary winding of transformer T2 is connected to negative input, and power supply input connects first power supply voltage, and output is connected to IN1 end and opposite unit respectively, and opposite unit is also connected with IN2 end.

Description

Technical Field

[0001] This utility model relates to the field of ultrasonic cleaning device control circuit technology, specifically to an ultrasonic glasses case control circuit. Background Technology

[0002] Since the application of ultrasonic cleaning technology in the home appliance industry, the reliability, efficiency, and intelligence level of its control circuits have been key to the industry's development. The core drive circuit of an ultrasonic cleaning device directly determines the cleaning effect, energy consumption, and service life of the entire machine. Currently, the most common drive solution on the market is the half-bridge control circuit.

[0003] Traditional half-bridge control circuits are mostly driven at a fixed frequency, making it impossible to track the drift of the transducer's resonant frequency. When water temperature, water volume, or load changes, the system is prone to "detuning," leading to a sudden drop in power, a sharp decline in efficiency, and a surge in heat generation. Furthermore, traditional half-bridge control circuits typically employ a controller plus an external power MOSFET driver, resulting in complex circuitry, large parameter dispersion, and difficulty in controlling production consistency. Utility Model Content

[0004] To address the shortcomings of existing technologies, an ultrasonic glasses case control circuit is provided.

[0005] To achieve the above objectives, this utility model provides an ultrasonic glasses case control circuit, including a full-bridge drive module, a transformer T2, an LC module, an ultrasonic transducer module, and a feedback control module. The full-bridge drive module includes a full-bridge drive chip U3 and an inverting unit. The full-bridge drive chip U3 has IN1, IN2, NSLEEP, OUT1, and OUT2 terminals. The IN2 terminal is connected to a first power supply voltage. The OUT1 and OUT2 terminals are connected to the primary winding of the transformer T2. The LC module is connected to one end of the secondary winding of the transformer T2, and one end of the ultrasonic transducer module is connected to the LC module. The feedback control module has a positive input terminal, a negative input terminal, a power supply input terminal, and an output terminal. The positive input terminal is connected to the other end of the ultrasonic transducer module, the negative input terminal is connected to the other end of the secondary winding of the transformer T2, the power supply input terminal is connected to the first power supply voltage, and the output terminal is connected to the IN1 terminal and the inverting unit. The inverting unit is also connected to the IN2 terminal.

[0006] According to one embodiment of the present invention, the inverting unit includes a resistor R6 and a transistor Q1. One end of the resistor R6 is connected to the output terminal, and the other end is connected to the base of the transistor Q1. The collector of the transistor Q1 is connected to the IN2 terminal, and the emitter of the transistor Q1 is grounded.

[0007] According to one embodiment of the present invention, the feedback control module includes a sampling resistor RS1, a comparator U5, a resistor R9, and a capacitor C9. The comparator U5 has an IV+ terminal, a V- terminal, an IN- terminal, a V+ terminal, an SD terminal, and an OUT terminal. One end of the sampling resistor RS1 is connected to the ultrasonic transducer module and the IV+ terminal, and the other end is connected to one end of the secondary winding of transformer T2, the ground terminal, and the IN- terminal. The V- terminal is grounded, and the V+ and SD terminals are connected to the first power supply voltage. The OUT terminal is connected to IN1 and the inverting unit, respectively. One end of the resistor R9 is connected to the OUT terminal, and the other end is connected to the V+ terminal and the capacitor C9. The other end of the capacitor C9 is grounded.

[0008] According to one embodiment of the present invention, the LC module includes an inductor L2 and a capacitor CB1. One end of the inductor L2 is connected to the secondary winding of the transformer T2, and the other end is connected to the ultrasonic transducer module and the capacitor CB1 respectively. The other end of the capacitor CB1 is connected to the ultrasonic transducer module and the positive input terminal.

[0009] According to one embodiment of the present invention, the full-bridge drive module further includes a voltage divider unit, which includes resistor R3 and resistor R4. One end of resistor R3 is connected to the IN2 terminal and the first power supply voltage, and the other end is connected to the VREF terminal of the full-bridge drive chip U3. The other end of resistor R4 is grounded.

[0010] According to one embodiment of the present invention, the full-bridge drive module further includes a filtering unit, which includes capacitor C6 and capacitor C7. One end of capacitor C6 is connected to the VM terminal of the full-bridge drive chip U3 and the second power supply voltage, and the other end is grounded. One end of capacitor C7 is connected to capacitor C6, the VM terminal of the full-bridge drive chip U3 and the second power supply voltage, and the other end is connected to the VCP terminal of the full-bridge drive chip U3.

[0011] According to one embodiment of the present invention, the full-bridge drive module further includes an RC unit, which includes a resistor R14 and a capacitor C15. One end of the resistor R14 is connected to the inverting unit and the IPROPI terminal of the full-bridge drive chip U3, respectively, and the other end is connected to the capacitor C15. The other end of the capacitor C15 is grounded.

[0012] According to one embodiment of the present invention, the full-bridge drive module further includes a resistor R1, one end of which is connected to the IN1 terminal and the other end of which is connected to the output terminal.

[0013] According to one embodiment of the present invention, the full-bridge drive module further includes a resistor R5, which is connected to the NSLEEP terminal.

[0014] According to one embodiment of the present invention, the full-bridge drive module further includes a capacitor C8, one end of which is connected to the CPL terminal of the full-bridge drive chip U3, and the other end of which is connected to the CPH terminal of the full-bridge drive chip U3.

[0015] The beneficial effects of this invention are that by using a full-bridge driver chip U3 to drive transformer T2, the voltage amplitude applied to transformer T2 is twice that of a half-bridge, resulting in higher power output capability and conversion efficiency. By setting up a feedback control module to achieve automatic switching of the PWM signal, the ultrasonic glasses case control circuit can automatically track and operate at the optimal resonance point regardless of changes in the ultrasonic transducer module, ensuring an ideal resonance state, thereby reducing heat generation in the ultrasonic glasses case control circuit and improving its stability. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a circuit diagram of the ultrasonic glasses case control circuit in the embodiment.

[0017] Explanation of reference numerals in the attached figures 1. Full-bridge drive module; 11. Inverting unit; 12. Voltage divider unit; 13. Filtering unit; 14. RC unit; 2. LC module; 3. Ultrasonic transducer module; 4. Feedback control module. Detailed Implementation

[0018] The following drawings will disclose several embodiments of this utility model. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit this utility model. That is, in some embodiments of this utility model, these practical details are not essential. In addition, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0019] Furthermore, in this utility model, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the utility model. They are merely used to distinguish components or operations described with the same technical terms and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0020] Please refer to Figure 1 , Figure 1 This is a circuit diagram of the ultrasonic glasses case control circuit in this example. This embodiment provides an ultrasonic glasses case control circuit, which includes a full-bridge drive module 1, a transformer T2, an inductor L2, an ultrasonic transducer module 3, and a feedback control module 4. The full-bridge drive module 1 includes a full-bridge drive chip U3 and an inverting unit 11. The full-bridge drive chip U3 has IN1, IN2, NSLEEP, OUT1, and OUT2 terminals. The IN2 terminal is connected to a first power supply voltage. The OUT1 and OUT2 terminals are connected to the primary winding of the transformer T2. The LC module 2 is connected to one end of the secondary winding of the transformer T2. One end of the ultrasonic transducer module 3 is internally connected to the LC module 2. The feedback control module 4 has a positive input terminal, a negative input terminal, a power supply input terminal, and an output terminal. The positive input terminal is connected to the other end of the ultrasonic transducer module 3, the negative input terminal is connected to the other end of the secondary winding of the transformer T2, the power supply input terminal is connected to the first power supply voltage, and the output terminal is connected to the IN1 terminal and the inverting unit 11. The inverting unit 11 is also connected to the IN2 terminal. In this example, the first power supply voltage is +5V.

[0021] In use, the NSLEEP terminal of the full-bridge driver chip U3 is connected to an external host computer. When the ultrasonic glasses case control circuit is activated, the external host computer sends an enable signal to the NSLEEP terminal of the full-bridge driver chip U3, causing the full-bridge driver chip U3 to start. After the full-bridge driver chip U3 starts, its OUT1 and OUT2 terminals send electrical signals to transformer T2 to drive the primary winding of transformer T2. Transformer T2 converts the low-voltage square wave output by the full-bridge driver chip U3 into high-voltage AC current to drive the ultrasonic transducer module 3. LC module 2 is used to form an LC resonant circuit with the ultrasonic transducer module 3 to precisely control the resonant frequency. The ultrasonic transducer module 3 is used to generate high-frequency vibrations, causing cavitation in the liquid to clean the glasses. In this example, the ultrasonic transducer module 3 is an ultrasonic transducer. The feedback control module 4 is used to collect the resonant current of the ultrasonic transducer module 3 and compare the collected resonant current of the ultrasonic transducer module 3 with the 0V reference point, accurately detecting the moment when the current crosses zero from positive to negative or from negative to positive. At the instant of zero crossing, the PWM signal output by the feedback control module 4 will change, and the PWM signal will be transmitted to the full-bridge driver chip U3 to achieve frequency tracking resonance and soft switching. The full-bridge driver chip U3 adjusts the output signal of the drive transformer T2 according to the PWM signal to achieve precise control of the transformer T2, thereby realizing frequency tracking control of the ultrasonic transducer. Regardless of changes in the water volume, water temperature, or items placed in the ultrasonic glasses case, causing a drift in the resonant frequency of the ultrasonic transducer module 3, the full-bridge driver chip U3 can detect this in real time and make the drive frequency "follow" the change, ensuring that the ultrasonic transducer module 3 is always "pulled back" to a highly efficient resonant state. This is the so-called "frequency tracking" function.

[0022] By employing the full-bridge control chip U3, the voltage amplitude that can be applied to transformer T2 under the same power supply voltage is twice that of the half-bridge, resulting in higher power output capability and conversion efficiency. The full-bridge driver chip U3 integrates the power execution section, consolidating the complex drive into a single unit. This simplifies the design and production of the ultrasonic glasses case control circuit. Furthermore, the full-bridge drive method allows for better control of leakage inductance energy, thus optimizing the leakage inductance spike voltage problem. Additionally, by setting up the feedback control module 4, automatic switching of the PWM signal is achieved. Regardless of changes in the ultrasonic transducer module 3, the ultrasonic glasses case control circuit can automatically track and operate at the optimal resonant point, ensuring an ideal resonant state, reducing heat generation in the ultrasonic glasses case control circuit, and improving its stability.

[0023] In this example, the full-bridge driver chip U3 is model TMI8123. The full-bridge driver chip U3 also has the following terminals: IPROPI, VREF, VM, VCP, CPL, CPH, IMODE, Pdas, PGND, GND, and PMODE. The IPROPI terminal is used for current detection. The VREF terminal is used for sampling and referencing the input overcurrent protection. The VM terminal is used to input the second supply voltage. The VCP terminal is connected to the second supply voltage. The CPL and CPH terminals form a charge pump circuit. The IMODE, Pdas, PGND, and GND terminals are all connected to ground. The PMODE terminal is connected to the first supply voltage.

[0024] The full-bridge driver module 1 also includes a filtering unit 13, which includes capacitors C6 and C7. One end of capacitor C6 is connected to the VM terminal of the full-bridge driver chip U3 and the second power supply voltage, and the other end is grounded. One end of capacitor C7 is connected to capacitor C6, the VM terminal of the full-bridge driver chip U3, and the second power supply voltage, and the other end is connected to the VCP terminal of the full-bridge driver chip U3.

[0025] In this example, the second supply voltage is +24V. After being filtered by capacitors C6 and C7, the +24V supply voltage is input to the full-bridge driver chip U3 to power it.

[0026] The full-bridge drive module 1 also includes a resistor R1, one end of which is connected to the IN1 terminal, and the other end is connected to the output terminal of the feedback control module 4. The resistor R1 is used for current limiting protection. The PWM signal output by the feedback control module 4 is current-limited by the resistor R1 and then input to the IN1 terminal of the drive control chip U3.

[0027] The full-bridge drive module 1 also includes a voltage divider unit 12, which includes resistors R3 and R4. One end of resistor R3 is connected to the IN2 terminal of the full-bridge drive chip U3 and the first power supply voltage, respectively, and the other end is connected to the VREF terminal of the full-bridge drive chip U3. The other end of resistor R4 is grounded.

[0028] Resistors R3 and R4 are used for voltage division. The +5V power supply voltage is divided by resistors R3 and R4 in sequence and then input to the VREF terminal of the full-bridge driver chip U3 to input the overcurrent protection reference value of the full-bridge driver chip U3.

[0029] The full-bridge driver chip U3 integrates a current mirror circuit. When the feedback control module 4 collects current, the current mirror circuit inside the full-bridge driver chip U3 outputs a copy current to the IPROPI terminal based on the electrical signal collected by the feedback control module 4. Then, the full-bridge driver chip U3 compares the copy current input to the IPROPI terminal with the reference value at the VREF terminal. When the copy current input to the IPROPI terminal is greater than the reference value at the VREF terminal, the full-bridge driver chip U3 stops outputting and triggers the overcurrent protection function to protect the subsequent circuits.

[0030] Furthermore, the full-bridge driver module 1 also includes a resistor R7, which is connected to the IPROPI terminal of the full-bridge control chip U3 and is used for current limiting. The copy current input to the IPROPI terminal is limited by resistor R7 before being input into the full-bridge control chip U3. In actual use, the threshold for triggering the overcurrent protection mechanism of the full-bridge driver chip U3 can be adjusted by changing the resistance value of resistor R7.

[0031] The full-bridge drive module 1 also includes an RC unit 14, which includes a resistor R14 and a capacitor C15. One end of the resistor R14 is connected to the inverting unit 11 and the IPROPI terminal of the full-bridge drive chip U3, respectively, and the other end is connected to the capacitor C15. The other end of the capacitor C15 is grounded.

[0032] In this example, the IPROPI terminal of the full-bridge driver chip U3 is filtered by RC unit 14 and then connected to the host computer. This allows the host computer to monitor the operating status of the ultrasonic glasses box control circuit in real time by reading the copied current, thus achieving closed-loop control. Furthermore, resistor R14 is used for current limiting, and capacitor C15 is used for filtering.

[0033] The full-bridge driver module 1 also includes a resistor R5, which is connected to the NSLEEP terminal. Resistor R5 is used to limit the current of the signal input to the NSLEEP terminal of the full-bridge driver chip U3.

[0034] The full-bridge driver module 1 also includes a capacitor C8. One end of capacitor C8 is connected to the CPL terminal of the full-bridge driver chip U3, and the other end is connected to the CPH terminal of the full-bridge driver chip U3. Capacitor C8 is used for energy storage. Connected between the CPL and CPH terminals, capacitor C8 generates a drive voltage higher than the power supply voltage through energy storage and discharge. This ensures that the high-side MOSFET inside the full-bridge driver chip U3 obtains sufficient gate voltage during switching, reducing conduction losses and improving efficiency.

[0035] The feedback control module 4 includes a sampling resistor RS1, a comparator U5, a resistor R9, and a capacitor C9. Comparator U5 has four terminals: IV+, V-, IN-, V+, SD, and OUT. One end of the sampling resistor RS1 serves as the positive input terminal of the feedback control module 4, connected to the ultrasonic transducer module 3. RS1 is also connected to the IV+ terminal. The other end serves as the negative input terminal of the feedback control module 4, connected to one end of the secondary winding of transformer T2. RS1 is also connected to ground and the IN- terminal of comparator U5. The V- terminal of comparator U5 is grounded, and the V+ terminal serves as the power supply input terminal of the feedback control module 4, connected to the first power supply voltage. The SD terminal of comparator U5 is connected to the 5V power supply voltage. The OUT terminal of comparator U5 serves as the output terminal of the feedback control module 4, connected to the IN1 terminal of the full-bridge driver chip U3 and the inverting unit 11. One end of resistor R9 is connected to the OUT terminal, and the other end is connected to the V+ terminal and capacitor C9. The other end of capacitor C9 is grounded.

[0036] The sampling resistor RS1 is used to acquire the current output by transformer T2 (i.e., the resonant current of ultrasonic transducer module 3). Comparator U5 receives the current acquired by sampling resistor RS1 at its IV+ and IN- terminals, and outputs a PWM signal to the full-bridge driver chip U3 based on the current acquired by RS1, causing the full-bridge driver chip U3 to change its output signal according to the PWM signal. Furthermore, resistor R9 is used to limit the current of the PWM signal output by comparator U5, and capacitor C9 is used for filtering.

[0037] The inverting unit 11 includes a resistor R6 and a transistor Q1. One end of the resistor R6 is connected to the output terminal of the feedback control module 4, and the other end is connected to the base of the transistor Q1. The collector of the transistor Q1 is connected to the IN2 terminal of the full-bridge driver chip U3, and the emitter of the transistor Q1 is grounded.

[0038] Resistor R6 is used for current limiting. The electrical signal output by feedback control module 4 is input to the base of transistor Q1 after passing through resistor R6. When the electrical signal output by feedback control module 4 is high, transistor Q1 is turned on. After transistor Q1 is turned on, its collector is low, causing a low-level signal to be input to IN2 of the full-bridge driver chip U3. When the electrical signal output by feedback control module 4 is low, transistor Q1 is turned off. When transistor Q1 is turned off, its collector is high, causing a high-level signal to be input to IN2 of the full-bridge driver chip U3. By setting up the inverting unit 11, the input signals of IN1 and IN2 of the full-bridge control chip U3 are kept complementary, providing clean and non-overlapping complementary logic signals for IN1 and IN2 of the full-bridge control chip U3, preventing logic confusion, ensuring the formation of an effective alternating current path, and generating a correct AC waveform.

[0039] LC module 2 includes inductor L2 and capacitor CB1. One end of inductor L2 is connected to the secondary winding of transformer T2, and the other end is connected to ultrasonic transducer module 3 and capacitor CB1. The other end of capacitor CB1 is connected to the positive input terminal of ultrasonic transducer module 3 and feedback control module.

[0040] Inductor L2 is a resonant inductor, capacitor CB1 is a resonant capacitor, and inductor L2, capacitor CB1 and ultrasonic transducer module 3 form an LC resonant circuit, so that ultrasonic transducer module 3 operates at the resonant frequency to improve energy conversion efficiency.

[0041] In summary, by using a full-bridge driver chip U3 to drive transformer T2, the voltage amplitude applied to transformer T2 is twice that of a half-bridge, resulting in higher power output and conversion efficiency. By setting up a feedback control module 4 to automatically switch the PWM signal, the ultrasonic glasses case control circuit can automatically track and operate at the optimal resonant point regardless of changes in the ultrasonic transducer module 3, ensuring an ideal resonant state, reducing heat generation in the ultrasonic glasses case control circuit, and improving its stability.

[0042] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. An ultrasonic glasses case control circuit, characterized in that, include: The system comprises a full-bridge drive module (1), a transformer T2, an LC module (2), an ultrasonic transducer module (3), and a feedback control module (4). The full-bridge drive module (1) includes a full-bridge drive chip U3 and an inverting unit (11). The full-bridge drive chip U3 has an IN1 terminal, an IN2 terminal, an NSLEEP terminal, an OUT1 terminal, and an OUT2 terminal. The IN2 terminal is connected to a first power supply voltage. The OUT1 terminal and the OUT2 terminal are connected to the primary winding of the transformer T2. The LC module (2) is connected to one end of the secondary winding of the transformer T2. One end of the ultrasonic transducer module (3) is connected to the LC module (2). The feedback control module (4) has a positive input terminal, a negative input terminal, a power supply input terminal, and an output terminal. The positive input terminal is connected to the other end of the ultrasonic transducer module (3). The negative input terminal is connected to the other end of the secondary winding of the transformer T2. The power supply input terminal is connected to the first power supply voltage. The output terminal is connected to the IN1 terminal and the inverting unit (11). The inverting unit (11) is also connected to the IN2 terminal.

2. The ultrasonic eyeglass case control circuit according to claim 1, characterized in that, The inverting unit (11) includes a resistor R6 and a transistor Q1. One end of the resistor R6 is connected to the output terminal, and the other end is connected to the base of the transistor Q1. The collector of the transistor Q1 is connected to the IN2 terminal, and the emitter of the transistor Q1 is grounded.

3. The ultrasonic eyeglass case control circuit according to claim 1, characterized in that, The feedback control module (4) includes a sampling resistor RS1, a comparator U5, a resistor R9, and a capacitor C9. The comparator U5 has an IV+ terminal, a V- terminal, an IN- terminal, a V+ terminal, an SD terminal, and an OUT terminal. One end of the sampling resistor RS1 is connected to the ultrasonic transducer module (3) and the IV+ terminal, and the other end is connected to one end of the secondary winding of the transformer T2, the ground terminal, and the IN- terminal, respectively. The V- terminal is grounded, and the V+ terminal and the SD terminal are connected to the first power supply voltage. The OUT terminal is connected to the IN1 and the inverting unit (11), respectively. One end of the resistor R9 is connected to the OUT terminal, and the other end is connected to the V+ terminal and the capacitor C9. The other end of the capacitor C9 is grounded.

4. The ultrasonic eyeglass case control circuit according to claim 1, characterized in that, The LC module (2) includes an inductor L2 and a capacitor CB1. One end of the inductor L2 is connected to the secondary winding of the transformer T2, and the other end is connected to the ultrasonic transducer module (3) and the capacitor CB1 respectively. The other end of the capacitor CB1 is connected to the ultrasonic transducer module (3) and the positive input terminal.

5. The ultrasonic eyeglass case control circuit according to claim 1, characterized in that, The full-bridge drive module (1) further includes a voltage divider unit (12), which includes resistors R3 and R4. One end of resistor R3 is connected to the IN2 terminal and the first power supply voltage, and the other end is connected to the VREF terminal of the full-bridge drive chip U3. The other end of resistor R4 is grounded.

6. The ultrasonic eyeglass case control circuit according to claim 1, characterized in that, The full-bridge drive module (1) further includes a filter unit (13), which includes capacitor C6 and capacitor C7. One end of capacitor C6 is connected to the VM terminal of the full-bridge drive chip U3 and the second power supply voltage, and the other end is grounded. One end of capacitor C7 is connected to capacitor C6, the VM terminal of the full-bridge drive chip U3 and the second power supply voltage, and the other end is connected to the VCP terminal of the full-bridge drive chip U3.

7. The ultrasonic eyeglass case control circuit according to claim 1, characterized in that, The full-bridge drive module (1) further includes an RC unit (14), which includes a resistor R14 and a capacitor C15. One end of the resistor R14 is connected to the inverting unit (11) and the IPROPI terminal of the full-bridge drive chip U3, respectively, and the other end is connected to the capacitor C15. The other end of the capacitor C15 is grounded.

8. The ultrasonic eyeglass case control circuit according to claim 1, characterized in that, The full-bridge drive module (1) also includes a resistor R1, one end of which is connected to the IN1 terminal and the other end of which is connected to the output terminal.

9. The ultrasonic eyeglass case control circuit according to claim 1, characterized in that, The full-bridge drive module (1) also includes a resistor R5, which is connected to the NSLEEP terminal.

10. The ultrasonic eyeglass case control circuit according to claim 1, characterized in that, The full-bridge driver module (1) also includes a capacitor C8, one end of which is connected to the CPL terminal of the full-bridge driver chip U3, and the other end of which is connected to the CPH terminal of the full-bridge driver chip U3.

Images