Driving circuit for realizing lens zooming without motor driving

Abstract

The utility model discloses a driving circuit capable of realizing lens zooming without motor driving, which is characterized by comprising a singlechip control circuit, an adjusting and amplifying voltage output circuit, a crystal lens driving circuit and a crystal lens, the crystal lens comprises two crystal plates and a lens, the crystal plates are mounted on the lens, and the lens is mounted on the singlechip control circuit. The single-chip microcomputer control circuit is electrically connected with the crystal lens driving circuit and the adjusting voltage amplification output circuit, the adjusting voltage amplification output circuit is connected with the crystal lens driving circuit, the crystal lens driving circuit comprises two independent voltage output ends, and the two independent voltage output ends are connected with the corresponding crystal pieces respectively. The single-chip microcomputer control circuit is used for outputting five paths of PWM voltage signals to the adjusting voltage amplification output circuit and the crystal lens driving circuit, and the crystal lens driving circuit comprises two H-bridge circuits. According to the utility model, the position of the lens can be changed without a motor, so that the zoom degree of the lens is changed, and the zoom of the lens is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of lens zoom driving, in particular to a driving circuit for realizing lens zoom without motor driving. Background Art

[0002] The lens in the stage light often needs to be zoomed to achieve different lighting effects in different environments. The lens editing of existing stage lights usually uses a motor or other power equipment (such as a cylinder) to directly or indirectly drive the lens to move, and achieve zoom and focus by changing the distance. The use of a motor requires a large volume of the stage light and is also costly. For small stage lights or other small lighting equipment, it is not suitable to use a motor drive solution. For this reason, a solution that can achieve lens zoom without a motor is needed, especially a drive that can achieve lens zoom at the circuit level. Utility Model Content

[0003] In view of the deficiencies of the prior art, the purpose of the utility model is to provide a drive circuit for realizing lens zoom without motor drive, which can solve the problems described in the background technology.

[0004] The technical scheme for achieving the purpose of the utility model is: a driving circuit for realizing lens zoom without motor drive, comprising a single-chip control circuit, an adjusting and amplifying voltage output circuit, a crystal lens driving circuit and a crystal lens, wherein the crystal lens comprises two crystal sheets and a lens, wherein the crystal sheet is mounted on the lens, the single-chip control circuit is electrically connected to the crystal lens driving circuit and the adjusting and amplifying voltage output circuit respectively, wherein the adjusting and amplifying voltage output circuit is connected to the crystal lens driving circuit, wherein the crystal lens driving circuit comprises two independent voltage output terminals, wherein the two independent voltage output terminals are respectively connected to a corresponding crystal sheet, wherein the single-chip control circuit is used to output a first PWM voltage signal-a fifth PWM voltage signal, wherein the adjusting and amplifying voltage output circuit is used to amplify the input fifth PWM voltage signal and then output a voltage to the crystal lens driving circuit,

[0005] The crystal lens driving circuit includes two H-bridge circuits. The first PWM voltage signal - the fourth PWM voltage signal and the voltage output after amplification by the regulating voltage amplification output circuit are respectively connected to the two H-bridge circuits, so that the two H-bridge circuits output alternating current, so that the crystal piece on the lens moves by virtue of the different voltage magnitudes at different times, so as to drive the crystal piece to move, thereby driving the lens to move, thereby completing the zoom of the lens.

[0006] Furthermore, the first PWM voltage signal and the second PWM voltage signal are independent of each other, the third PWM voltage signal and the fourth PWM voltage signal are independent of each other, the first PWM voltage signal and the second PWM voltage signal are connected to an H-bridge circuit, and the third PWM voltage signal and the fourth PWM voltage signal are connected to another H-bridge circuit.

[0007] Furthermore, the two H-bridge circuits convert the received first PWM voltage signal - the fourth PWM voltage signal into a square wave alternating current and output it to the crystal lens.

[0008] Furthermore, the single-chip control circuit includes a single-chip U1, a linear regulator U4, a resistor R4, a capacitor C1, a capacitor C8 and a capacitor C9. The input of the linear regulator U4 is used to connect to an external power supply. The linear regulator U4 steps down the input voltage and outputs it to the single-chip. The output end of the linear regulator U4 is connected to one end of the first parallel circuit as a final output end. The final output end is connected in series with the resistor R4 and then connected to the pin 4 of the single-chip U1. The node where the pin 4 is connected to the resistor R4 is also connected in series with the capacitor C1 and then grounded.

[0009] Pins 12, 13, 14, 17 and 18 of the microcontroller U1 respectively output the first PWM voltage signal - the fifth PWM voltage signal. Pins 12, 13, 14 and 17 of the microcontroller U1 are respectively connected to two H bridges, and pin 18 is connected to the input end of the regulated voltage amplification output circuit.

[0010] Furthermore, the model of the single chip microcomputer U1 is STM32F030F4P6.

[0011] Furthermore, the single chip control circuit also includes a light emitting diode LED1 and a resistor R7, the final output end is connected to the positive electrode of the light emitting diode LED1, and the negative electrode of the light emitting diode LED1 is connected in series with the resistor R7 and then connected to the pin 10 of the single chip.

[0012] Furthermore, the crystal lens driving circuit includes two H-bridge circuits, which are defined as H-bridge circuit A and H-bridge circuit B, respectively. H-bridge circuit A includes a first branch and a second branch. The first branch includes resistor R9, resistor R12, resistor R15, resistor R18, resistor R21, transistor Q2, transistor Q6 and transistor Q7. One end of resistor R18 is connected to pin 12 of microcontroller U1, and the other end of resistor R18 is connected to resistor R21 and then connected to the base of transistor Q6. The collector of transistor Q6 is connected to one end of resistor R12 and one end of resistor R15, respectively. The other end of the resistor R12 is connected to the output end of the regulating voltage amplifier circuit, the other end of the resistor R15 is respectively connected to the base of the transistor Q2 and the base of the transistor Q7, the collector of the transistor Q2 is connected in series with the resistor R9 and then connected to the output end of the regulating voltage amplifier circuit, the emitter of the transistor Q2 is connected to the emitter of the transistor Q7, and the connection node of the emitter of the transistor Q2 and the emitter of the transistor Q7 is connected to the crystal chip as the output end of the first branch, the collector of the transistor Q7, the emitter of the transistor Q6 and the other end of the resistor R21 are connected and then grounded together,

[0013] The second branch includes resistor R8, resistor R11, resistor R14, resistor R17, resistor R20, transistor Q1, transistor Q4 and transistor Q5. One end of resistor R17 is connected to pin 13 of microcontroller U1. The other end of resistor R17 is connected to resistor R20 and then connected to the base of transistor Q4. The collector of transistor Q4 is respectively connected to one end of resistor R11 and one end of resistor R14. The other end of resistor R14 is connected to the output end of the regulating voltage amplifier circuit. The other end of R14 is connected to the base of transistor Q1 and the base of transistor Q5 respectively. The collector of transistor Q1 is connected in series with resistor R8 and then connected to the output end of the regulating voltage amplifier circuit. The emitter of transistor Q1 is connected to the emitter of transistor Q5, and the connection node of the emitter of transistor Q2 and the emitter of transistor Q7 is connected to the crystal chip as the output end of the second branch. The collector of transistor Q5, the emitter of transistor Q4 and the other end of resistor R20 are connected and then grounded together.

[0014] The H-bridge circuit B includes a third branch and a fourth branch. The third branch includes a resistor R10, a resistor R13, a resistor R16, a resistor R19, a resistor R22, a transistor Q3, a transistor Q8 and a transistor Q9. One end of the resistor R19 is connected to the pin 14 of the single-chip computer U1. The other end of the resistor R19 is connected to the resistor R22 and then connected to the base of the transistor Q8. The collector of the transistor Q8 is respectively connected to one end of the resistor R13 and one end of the resistor R16. The other end of the resistor R13 is connected to the regulating voltage amplifier circuit. The output end of the transistor Q3 is connected, the other end of the resistor R16 is connected to the base of the transistor Q3 and the base of the transistor Q9 respectively, the collector of the transistor Q3 is connected in series with the resistor R10 and then connected to the output end of the regulating voltage amplifier circuit, the emitter of the transistor Q3 is connected to the emitter of the transistor Q9, and the connection node of the emitter of the transistor Q3 and the emitter of the transistor Q9 is connected to the crystal chip as the output end of the third branch, the collector of the transistor Q9, the emitter of the transistor Q8 and the other end of the resistor R22 are connected and then grounded together,

[0015] The fourth branch includes resistor R23, resistor R24, resistor R27, resistor R31, resistor R32, transistor Q10, transistor Q11 and transistor Q12. One end of resistor R31 is connected to pin 17 of microcontroller U1. The other end of resistor R31 is connected to resistor R32 and then connected to the base of transistor Q11. The collector of transistor Q11 is respectively connected to one end of resistor R24 ​​and one end of resistor R27. The other end of resistor R24 ​​is connected to the output end of the regulating voltage amplifier circuit. The other end of 7 is connected to the base of transistor Q10 and the base of transistor Q12 respectively. The collector of transistor Q10 is connected in series with resistor R23 and then connected to the output end of the regulating voltage amplifier circuit. The emitter of transistor Q10 is connected to the emitter of transistor Q12, and the connection node between the emitter of transistor Q12 and the emitter of transistor Q10 is connected to the crystal chip as the output end of the fourth branch. The collector of transistor Q12, the emitter of transistor Q11 and the other end of resistor R32 are connected and grounded together.

[0016] Further, the regulating voltage amplification circuit includes an op amp U3A, an op amp U3B, a capacitor C6, a capacitor C7, a capacitor C14, a resistor R25, a resistor R25, a resistor R25, a resistor R25 and a resistor R25, one end of the resistor R29 is connected to the pin 18 of the single-chip computer U1, the other end of the resistor R29 is respectively connected to one end of the resistor R30 and one end of the capacitor C6, the other end of the capacitor C6 is grounded, the other end of the resistor R30 is respectively connected to one end of the resistor C7 and the positive input end of the op amp U3A, the other end of the capacitor C7 is grounded, the reverse input end of the op amp U3A is respectively connected to one end of the resistor R25 and one end of the resistor R26, the other end of the resistor R25 is grounded, the other end of the resistor R26 is respectively connected to one end of the resistor R28 and the output end of the op amp U3A, the pin 4 of the op amp U3A is respectively connected to an 18V voltage and a capacitor C14 in series and then grounded, the pin 5 of the op amp is grounded,

[0017] The other end of the resistor R28 is connected to the positive input end of the operational amplifier U3B. The reverse input end of the operational amplifier U3B is connected to the output end of the operational amplifier U3B and together serves as the output end of the regulating voltage amplifier circuit, and is connected to the first branch to the fourth branch.

[0018] Furthermore, it also includes a capacitor C4 and a capacitor C5, which are connected in parallel to form a second parallel branch, one end of the second parallel branch is grounded, and the other end is connected to the output end of the regulating voltage amplifier circuit.

[0019] Furthermore, the operational amplifier U3A is a common-mode amplifier that only amplifies voltage but not current, and the operational amplifier U3B circuit is a current follower that is used to provide output current gain for the voltage of the previous stage.

[0020] The beneficial effects of the utility model are as follows: the utility model can change the position of the lens without relying on a motor, thereby changing the zoom degree of the lens, thereby realizing the zoom of the lens. The utility model only needs a single chip microcomputer, two H-bridge circuits and a voltage amplifier circuit, has low cost, uses the circuit level as a drive, and is stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the framework of the utility model;

[0022] Figure 2 It is a circuit diagram of the utility model;

[0023] Figure 3 for Figure 1 Circuit diagram of the single chip microcomputer control circuit;

[0024] Figure 4 for Figure 1Circuit diagram of the crystal lens driving circuit;

[0025] Figure 5 for Figure 1 Circuit diagram of the regulated voltage amplifier circuit. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and specific implementation plans:

[0027] like Figure 1-Figure 5 As shown, a driving circuit for realizing lens zoom without motor drive includes a single-chip control circuit, an adjustment and amplification voltage output circuit, a crystal lens driving circuit and a crystal lens, wherein the crystal lens includes two crystal sheets and a lens, and the crystal sheet is mounted on the lens. The single-chip control circuit is electrically connected to the crystal lens driving circuit and the adjustment voltage amplification output circuit respectively, and the adjustment voltage amplification output circuit is connected to the crystal lens driving circuit. The crystal lens driving circuit includes two independent voltage output terminals, and the two independent voltage output terminals are respectively connected to a corresponding crystal sheet. The single-chip control circuit is used to output a first PWM voltage signal-a fifth PWM voltage signal, and the first PWM voltage signal-a fourth PWM voltage signal is output to the crystal lens driving circuit, and the fifth PWM voltage signal is output to the adjustment voltage amplification output circuit, and the adjustment voltage amplification output circuit is used to amplify the fifth PWM voltage signal and output the voltage to the crystal lens driving circuit.

[0028] The crystal lens driving circuit includes two H-bridge circuits. The first PWM voltage signal-the fourth PWM voltage signal and the voltage output after the fifth PWM voltage signal is amplified by the regulating voltage amplification output circuit are respectively connected to the two H-bridge circuits, so that the two H-bridge circuits output alternating current, so that the crystal piece on the lens moves by virtue of the different voltage magnitudes at different times, so as to drive the crystal piece to move, thereby driving the lens to move, thereby completing the zoom of the lens.

[0029] The single-chip control circuit includes a single-chip U1, a linear voltage regulator U4, a resistor R4, a capacitor C1, a capacitor C8 and a capacitor C9. The input of the linear voltage regulator U4 is used to connect to an external power supply (for example, an external voltage of 18V). The linear voltage regulator U4 outputs the input voltage to the single-chip after stepping down the voltage, for example, stepping down the voltage to 3.3V and inputting it to the single-chip U1. In this embodiment, the output end of the linear voltage regulator U4 is connected to one end of the first parallel circuit as the final output end, and the final output end is connected in series with the resistor R4 and then connected to the pin 4 (NRST pin in the figure) of the single-chip U1. The node where the pin 4 is connected to the resistor R4 is also connected in series with the capacitor C1 and then grounded.

[0030] In an optional embodiment, the single chip control circuit further includes a light emitting diode LED1 and a resistor R7, the final output end is connected to the positive electrode of the light emitting diode LED1, and the negative electrode of the light emitting diode LED1 is connected in series with the resistor R7 and then connected to the pin 10 of the single chip.

[0031] Pins 12, 13, 14, 17 and 18 of the single-chip microcomputer U1 output the first PWM voltage signal to the fifth PWM voltage signal respectively, and are recorded as 1A_PWM, 1B_PWM, 2A_PWM, 2B_PWM and V_PWM in sequence. Pins 12, 13, 14 and 17 of the single-chip microcomputer U1 are respectively connected to two H bridges, and pin 18 is connected to the input end of the regulated voltage amplification output circuit.

[0032] The crystal lens driving circuit includes two H-bridge circuits, which are defined as H-bridge circuit A and H-bridge circuit B, respectively. H-bridge circuit A includes a first branch and a second branch. The first branch includes resistor R9, resistor R12, resistor R15, resistor R18, resistor R21, transistor Q2, transistor Q6 and transistor Q7. One end of resistor R18 is connected to pin 12 of single-chip microcomputer U1, and the other end of resistor R18 is connected to resistor R21 and then connected to the base of transistor Q6. The collector of transistor Q6 is connected to one end of resistor R12 and one end of resistor R15, respectively, and the other end of resistor R12 is connected to the output end of the regulating voltage amplifier circuit. The other end of the resistor R15 is connected to the base of the transistor Q2 and the base of the transistor Q7 respectively. The collector of the transistor Q2 is connected in series with the resistor R9 and then connected to the output end of the regulating voltage amplifier circuit. The emitter of the transistor Q2 is connected to the emitter of the transistor Q7, and the connection node of the emitter of the transistor Q2 and the emitter of the transistor Q7 is connected to the crystal chip as the output end of the first branch. The collector of the transistor Q7, the emitter of the transistor Q6 and the other end of the resistor R21 are connected and then grounded together.

[0033] The second branch includes resistor R8, resistor R11, resistor R14, resistor R17, resistor R20, transistor Q1, transistor Q4 and transistor Q5. One end of resistor R17 is connected to pin 13 of single-chip computer U1, and the other end of resistor R17 is connected to resistor R20 and then connected to the base of transistor Q4. The collector of transistor Q4 is respectively connected to one end of resistor R11 and one end of resistor R14, and the other end of resistor R14 is connected to the output end of the regulating voltage amplifier circuit. The other end of resistor R14 is respectively connected to the base of transistor Q1 and the base of transistor Q5, and the collector of transistor Q1 is connected to the output end of the regulating voltage amplifier circuit after being connected in series with resistor R8. The emitter of transistor Q1 is connected to the emitter of transistor Q5, and the connection node of the emitter of transistor Q2 and the emitter of transistor Q7 is connected to the crystal chip as the output end of the second branch. The collector of the transistor Q5, the emitter of the transistor Q4 and the other end of the resistor R20 are connected and grounded.

[0034] The H-bridge circuit B includes a third branch and a fourth branch. The third branch includes a resistor R10, a resistor R13, a resistor R16, a resistor R19, a resistor R22, a transistor Q3, a transistor Q8 and a transistor Q9. One end of the resistor R19 is connected to the pin 14 of the single-chip computer U1, and the other end of the resistor R19 is connected to the base of the transistor Q8 after being connected to the resistor R22. The collector of the transistor Q8 is connected to one end of the resistor R13 and one end of the resistor R16 respectively, and the other end of the resistor R13 is connected to the output end of the regulating voltage amplifier circuit. The other end of the resistor R16 is connected to the base of the transistor Q3 and the base of the transistor Q9 respectively, and the collector of the transistor Q3 is connected to the output end of the regulating voltage amplifier circuit after being connected in series with the resistor R10, and the emitter of the transistor Q3 is connected to the emitter of the transistor Q9, and the connection node of the emitter of the transistor Q3 and the emitter of the transistor Q9 is connected to the crystal chip as the output end of the third branch. The collector of the transistor Q9, the emitter of the transistor Q8 and the other end of the resistor R22 are connected and grounded.

[0035] The fourth branch includes resistor R23, resistor R24, resistor R27, resistor R31, resistor R32, transistor Q10, transistor Q11 and transistor Q12. One end of resistor R31 is connected to pin 17 of single-chip computer U1, and the other end of resistor R31 is connected to resistor R32 and then connected to the base of transistor Q11. The collector of transistor Q11 is connected to one end of resistor R24 ​​and one end of resistor R27 respectively, and the other end of resistor R24 ​​is connected to the output end of the regulating voltage amplifier circuit. The other end of resistor R27 is connected to the base of transistor Q10 and the base of transistor Q12 respectively, and the collector of transistor Q10 is connected to the output end of the regulating voltage amplifier circuit after being connected in series with resistor R23. The emitter of transistor Q10 is connected to the emitter of transistor Q12, and the connection node of the emitter of transistor Q12 and the emitter of transistor Q10 is connected to the crystal chip as the output end of the fourth branch. The collector of the transistor Q12, the emitter of the transistor Q11 and the other end of the resistor R32 are connected and grounded.

[0036] The regulating voltage amplifying circuit includes an amplifier U3A, an amplifier U3B, a capacitor C6, a capacitor C7, a capacitor C14, a resistor R25, a resistor R25, a resistor R25, a resistor R25 and a resistor R25. One end of the resistor R29 is connected to the pin 18 of the single-chip computer U1, the other end of the resistor R29 is respectively connected to one end of the resistor R30 and one end of the capacitor C6, the other end of the capacitor C6 is grounded, the other end of the resistor R30 is respectively connected to one end of the resistor C7 and the positive input end of the amplifier U3A (i.e., pin 3 in the figure), and the other end of the capacitor C7 is grounded. The reverse input terminal of the operational amplifier U3A (i.e., pin 2 in the figure) is respectively connected to one end of resistor R25 and one end of resistor R26, the other end of resistor R25 is grounded, the other end of resistor R26 is respectively connected to one end of resistor R28 and the output terminal of the operational amplifier U3A (i.e., pin 1 in the figure), pin 4 of the operational amplifier U3A is respectively connected to an 18V voltage and a capacitor C14 in series and then grounded, and pin 5 (i.e., the ∞ end) of the operational amplifier is grounded.

[0037] The other end of the resistor R28 is connected to the positive input end of the operational amplifier U3B. The reverse input end of the operational amplifier U3B is connected to the output end of the operational amplifier U3B and together serves as the output end of the regulating voltage amplifier circuit, and is connected to the first branch to the fourth branch.

[0038] In an optional embodiment, it further includes a capacitor C4 and a capacitor C5, which are connected in parallel to form a second parallel branch, one end of the second parallel branch is grounded, and the other end is connected to the output end of the regulating voltage amplifier circuit.

[0039] Working principle: The fifth PWM voltage signal output by the single-chip computer U1 passes through the second-order RC filter circuit composed of resistor R29, resistor R30, capacitor C6 and capacitor C7. The second-order RC filter circuit has a stronger ability to suppress signals outside the same frequency band, a better filtering effect, and can achieve low-pass (allowing signals below the cut-off frequency to pass) and high-pass (allowing signals above the cut-off frequency to pass) filtering characteristics. Therefore, the voltage ripple of the V_PWM signal reaching pin 3 of the op amp U3A (dual operational amplifier) ​​is extremely small, and the output PWM voltage signal maintains a change of 0-3.3V. Then the voltage output by the dual operational amplifier U3A has a higher accuracy. According to the amplification principle of the op amp, the output voltage VOUT after amplification by the op amp U3A has the following relationship with the input voltage V_PWM: VOUT = V_PWM*(1+R26 / R25). The lowest output voltage = 0V, and the highest output voltage = 18.81V. Therefore, the voltage after amplification can change from 0V to 18.81V. The output voltage reaches pin 5 of the dual operational amplifier U3B through resistor R28. Since the amplifier circuit of the previous stage only amplifies voltage but not current, the operational amplifier U3A is a common-mode amplifier that only amplifies voltage but not current. Therefore, the U3B circuit is a current follower at this time, which provides output current gain for the voltage of the previous stage. It has low input impedance and high output impedance, so that the output can carry large current and drive the load. Therefore, different voltages and higher output current capabilities can be provided to supply the voltage of the crystal lens drive circuit of the subsequent stage including two H-bridge circuits, thereby changing the position of the lens and thus changing the zoom degree of the lens.

[0040] The microcontroller U1 (its model is STM32F030F4P6) outputs four PWM signals 1A_PWM, 2A_PWM, 1B_PWM, and 2B_PWM. 1A_PWM and 2A_PWM are independent of each other, and 1B_PWM and 2B_PWM are also complementary. For example, when the 1A_PWM signal is at a high level, it is connected to an NPN transistor Q6 (SS8050), making the transistor Q6 (SS8050) conductive, so the voltage flowing through the resistor R15 is at a low level, making the subsequent stage connected to an NPN transistor Q2 (SS8050) cut off, and connected to another large current, small signal PNP silicon transistor Q7 (SS8550) is conductive. At this time, the 2A_PWM signal should be low level, connected to an NPN transistor Q4 (SS8050), so that the transistor Q4 (SS8050) is cut off, so the voltage flowing through the resistor R14 is high level, so that the next stage connected to an NPN transistor Q1 (SS8050) is turned on, and the other PNP silicon transistor Q5 (SS8550) with large current and small signal is turned off. At this time, the current of the H-bridge circuit of A flows from right to left. Similarly: when the 1A_PWM signal is low, it is connected to an NPN transistor Q6 (SS8050), which makes the transistor Q6 (SS8050) cut off, so the voltage flowing through the resistor R15 is high, making the next stage connected to an NPN transistor Q2 (SS8050) turned on, and connected to another large current, small signal PNP silicon transistor Q7 (SS8550) turned off. At this time, the 2A_PWM signal is high, connected to an NPN transistor Q4 (SS8050), which makes the transistor Q4 (SS8050) turned on, so the voltage flowing through the resistor R14 is low, making the next stage connected to an NPN transistor Q1 (SS8050) turned off, and connected to another large current, small signal PNP silicon transistor Q5 (SS8550) turned on. At this time, the current flow direction of the H-bridge circuit A is from left to right.

[0041] Similarly, when the 1B_PWM signal is high, it is connected to an NPN transistor Q8 (SS8050), making the transistor Q8 (SS8050) conduct, so the voltage flowing through the resistor R16 is low, making the next stage connected to an NPN transistor Q3 (SS8050) cut off, and connected to another large current, small signal PNP silicon transistor Q9 (SS8550) is in the conduction state. At this time, the 2B_PWM signal should be low, connected to an NPN transistor Q11 (SS8050), making the transistor Q11 (SS8050) cut off, so the voltage flowing through the resistor R27 is high, making the next stage connected to an NPN transistor Q10 (SS8050) conduct, and connected to another large current, small signal PNP silicon transistor Q12 (SS8550) is in the cut-off state. At this time, the current flow direction of the H-bridge circuit B is from right to left.

[0042] Similarly: when the 1B_PWM signal is low, it is connected to an NPN transistor Q8 (SS8050), which makes the transistor Q8 (SS8050) cut off, so the voltage flowing through the resistor R16 is high, making the next stage connected to an NPN transistor Q3 (SS8050) turned on, and connected to another large current, small signal PNP silicon transistor Q9 (SS8550) turned off. At this time, the 2B_PWM signal should be high, connected to an NPN transistor Q11 (SS8050), which makes the transistor Q11 (SS8050) turned on, so the voltage flowing through the resistor R27 is low, making the next stage connected to an NPN transistor Q10 (SS8050) turned off, and connected to another large current, small signal PNP silicon transistor Q12 (SS8550) turned on. At this time, the current of the H-bridge circuit B flows from left to right.

[0043] Therefore, the two H-bridge circuits can be turned on to generate alternating current, which generates square wave alternating current to move the crystal lens, and changes the position of the lens through different voltages, thereby changing the zoom degree of the lens. This achieves noise-free and fast lens driving, and the circuit is simple and low-cost.

[0044] The single-chip microcomputer U1 adopts a high-performance -M0 32-bit RISC core, high-speed embedded memory (up to 256kb flash and up to 32kb SRAM) microcontroller. First, the external input 18V passes through a linear regulator U4 (L78L33ABUTR), which has a withstand voltage of 5.3V-30V, and is filtered by capacitors C9 and C8 to directly output 3.3V for the microcontroller. The microcontroller U1 outputs four PWM ports as signals to drive the transistors, so that the two H-bridge circuits are turned on, thereby generating alternating current, generating square wave alternating current to move the crystal lens. The output PWM signal is amplified to supply power to the two H-bridge circuits to drive the voltage of the crystal lens, thereby changing the position of the lens and thus changing the zoom degree of the lens.

[0045] The utility model can change the position of the lens without relying on a motor, thereby changing the zoom degree of the lens, thereby realizing the zoom of the lens. The utility model only needs a single chip microcomputer, two H-bridge circuits and a voltage amplifier circuit, has low cost, uses the circuit level as a drive, and is stable and reliable.

[0046] The embodiment disclosed in this specification is only an example of the unilateral features of the utility model, and the protection scope of the utility model is not limited to this embodiment. Any other functionally equivalent embodiments fall within the protection scope of the utility model. For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all these changes and deformations should fall within the protection scope of the claims of the utility model.

Claims

1. A drive circuit for realizing lens zoom without motor drive, characterized in that: The invention comprises a single-chip control circuit, an adjusting and amplifying voltage output circuit, a crystal lens driving circuit and a crystal lens. The crystal lens comprises two crystal sheets and a lens. The crystal sheet is mounted on the lens. The single-chip control circuit is electrically connected to the crystal lens driving circuit and the adjusting and amplifying voltage output circuit respectively. The adjusting and amplifying voltage output circuit is connected to the crystal lens driving circuit. The crystal lens driving circuit comprises two independent voltage output terminals. The two independent voltage output terminals are respectively connected to a corresponding crystal sheet. The single-chip control circuit is used to output a first PWM voltage signal-a fifth PWM voltage signal. The adjusting and amplifying voltage output circuit is used to amplify the input fifth PWM voltage signal and then output a voltage to the crystal lens driving circuit. The crystal lens driving circuit includes two H-bridge circuits. The first PWM voltage signal-the fourth PWM voltage signal and the voltage output after amplification by the regulating voltage amplification output circuit are respectively connected to the two H-bridge circuits, so that the two H-bridge circuits output alternating current, so as to move the crystal piece on the lens by virtue of the different voltage magnitudes at different times, so as to drive the crystal piece to move, thereby driving the lens to move, thereby completing the zoom of the lens.

2. The driving circuit for realizing lens zoom without motor drive according to claim 1, characterized in that: The first PWM voltage signal and the second PWM voltage signal are independent of each other, the third PWM voltage signal and the fourth PWM voltage signal are independent of each other, the first PWM voltage signal and the second PWM voltage signal are connected to an H-bridge circuit, and the third PWM voltage signal and the fourth PWM voltage signal are connected to another H-bridge circuit.

3. The driving circuit for realizing lens zoom without motor drive according to claim 2, characterized in that: The two H-bridge circuits convert the received first PWM voltage signal - the fourth PWM voltage signal into square wave alternating current and output it to the crystal lens.

4. The driving circuit for realizing lens zoom without motor drive according to claim 3, characterized in that: The single-chip control circuit includes a single-chip U1, a linear regulator U4, a resistor R4, a capacitor C1, a capacitor C8 and a capacitor C9. The input of the linear regulator U4 is used to connect to an external power supply. The linear regulator U4 steps down the input voltage and outputs it to the single-chip. The output end of the linear regulator U4 is connected to one end of the first parallel circuit as a final output end. The final output end is connected in series with the resistor R4 and then connected to the pin 4 of the single-chip U1. The node where the pin 4 is connected to the resistor R4 is also connected in series with the capacitor C1 and then grounded. Pins 12, 13, 14, 17 and 18 of the microcontroller U1 output the first PWM voltage signal to the fifth PWM voltage signal respectively. Pins 12, 13, 14 and 17 of the microcontroller U1 are connected to two H bridges respectively, and pin 18 is connected to the input end of the regulated voltage amplification output circuit.

5. The driving circuit for realizing lens zoom without motor drive according to claim 4, characterized in that: The model of the single chip microcomputer U1 is STM32F030F4P6.

6. The driving circuit for realizing lens zoom without motor drive according to claim 4, characterized in that: The single chip control circuit also includes a light emitting diode LED1 and a resistor R7. The final output end is connected to the positive electrode of the light emitting diode LED1. The negative electrode of the light emitting diode LED1 is connected in series with the resistor R7 and then connected to the pin 10 of the single chip.

7. The driving circuit for realizing lens zoom without motor drive according to claim 4, characterized in that: The crystal lens driving circuit includes two H-bridge circuits, which are defined as H-bridge circuit A and H-bridge circuit B respectively. H-bridge circuit A includes a first branch and a second branch. The first branch includes resistor R9, resistor R12, resistor R15, resistor R18, resistor R21, transistor Q2, transistor Q6 and transistor Q7. One end of resistor R18 is connected to pin 12 of microcontroller U1. The other end of resistor R18 is connected to resistor R21 and then connected to the base of transistor Q6. The collector of transistor Q6 is connected to one end of resistor R12 and one end of resistor R15 respectively. The other end of the resistor R12 is connected to the output end of the regulating voltage amplifier circuit, the other end of the resistor R15 is respectively connected to the base of the transistor Q2 and the base of the transistor Q7, the collector of the transistor Q2 is connected in series with the resistor R9 and then connected to the output end of the regulating voltage amplifier circuit, the emitter of the transistor Q2 is connected to the emitter of the transistor Q7, and the connection node of the emitter of the transistor Q2 and the emitter of the transistor Q7 is connected to the crystal chip as the output end of the first branch, the collector of the transistor Q7, the emitter of the transistor Q6 and the other end of the resistor R21 are connected and then grounded together, The second branch includes resistor R8, resistor R11, resistor R14, resistor R17, resistor R20, transistor Q1, transistor Q4 and transistor Q5. One end of resistor R17 is connected to pin 13 of microcontroller U1. The other end of resistor R17 is connected to resistor R20 and then connected to the base of transistor Q4. The collector of transistor Q4 is respectively connected to one end of resistor R11 and one end of resistor R14. The other end of resistor R14 is connected to the output end of the regulating voltage amplifier circuit. The other end of R14 is connected to the base of transistor Q1 and the base of transistor Q5 respectively. The collector of transistor Q1 is connected in series with resistor R8 and then connected to the output end of the regulating voltage amplifier circuit. The emitter of transistor Q1 is connected to the emitter of transistor Q5, and the connection node of the emitter of transistor Q2 and the emitter of transistor Q7 is connected to the crystal chip as the output end of the second branch. The collector of transistor Q5, the emitter of transistor Q4 and the other end of resistor R20 are connected and then grounded together. The H-bridge circuit B includes a third branch and a fourth branch. The third branch includes a resistor R10, a resistor R13, a resistor R16, a resistor R19, a resistor R22, a transistor Q3, a transistor Q8 and a transistor Q9. One end of the resistor R19 is connected to the pin 14 of the single-chip computer U1. The other end of the resistor R19 is connected to the resistor R22 and then connected to the base of the transistor Q8. The collector of the transistor Q8 is respectively connected to one end of the resistor R13 and one end of the resistor R16. The other end of the resistor R13 is connected to the regulating voltage amplifier circuit. The output end of the transistor Q3 is connected, the other end of the resistor R16 is connected to the base of the transistor Q3 and the base of the transistor Q9 respectively, the collector of the transistor Q3 is connected in series with the resistor R10 and then connected to the output end of the regulating voltage amplifier circuit, the emitter of the transistor Q3 is connected to the emitter of the transistor Q9, and the connection node of the emitter of the transistor Q3 and the emitter of the transistor Q9 is connected to the crystal chip as the output end of the third branch, the collector of the transistor Q9, the emitter of the transistor Q8 and the other end of the resistor R22 are connected and then grounded together, The fourth branch includes resistor R23, resistor R24, resistor R27, resistor R31, resistor R32, transistor Q10, transistor Q11 and transistor Q12. One end of resistor R31 is connected to pin 17 of microcontroller U1. The other end of resistor R31 is connected to resistor R32 and then connected to the base of transistor Q11. The collector of transistor Q11 is respectively connected to one end of resistor R24 ​​and one end of resistor R27. The other end of resistor R24 ​​is connected to the output end of the regulating voltage amplifier circuit. The other end of 7 is connected to the base of transistor Q10 and the base of transistor Q12 respectively. The collector of transistor Q10 is connected in series with resistor R23 and then connected to the output end of the regulating voltage amplifier circuit. The emitter of transistor Q10 is connected to the emitter of transistor Q12, and the connection node between the emitter of transistor Q12 and the emitter of transistor Q10 is connected to the crystal chip as the output end of the fourth branch. The collector of transistor Q12, the emitter of transistor Q11 and the other end of resistor R32 are connected and grounded together.

8. The driving circuit for realizing lens zoom without motor drive according to claim 7, characterized in that: The regulating voltage amplifying circuit comprises an op amp U3A, an op amp U3B, a capacitor C6, a capacitor C7, a capacitor C14, a resistor R25, a resistor R25, a resistor R25, a resistor R25 and a resistor R25, one end of the resistor R29 is connected to the pin 18 of the single chip computer U1, the other end of the resistor R29 is respectively connected to one end of the resistor R30 and one end of the capacitor C6, the other end of the capacitor C6 is grounded, the other end of the resistor R30 is respectively connected to one end of the resistor C7 and the positive input end of the op amp U3A, the other end of the capacitor C7 is grounded, the reverse input end of the op amp U3A is respectively connected to one end of the resistor R25 and one end of the resistor R26, the other end of the resistor R25 is grounded, the other end of the resistor R26 is respectively connected to one end of the resistor R28 and the output end of the op amp U3A, the pin 4 of the op amp U3A is respectively connected to an 18V voltage and a capacitor C14 in series and then grounded, the pin 5 of the op amp is grounded, The other end of the resistor R28 is connected to the positive input end of the operational amplifier U3B. The reverse input end of the operational amplifier U3B is connected to the output end of the operational amplifier U3B and together serves as the output end of the regulating voltage amplifier circuit, and is connected to the first branch to the fourth branch.

9. The driving circuit for realizing lens zoom without motor drive according to claim 8, characterized in that: It also includes a capacitor C4 and a capacitor C5, which are connected in parallel to form a second parallel branch, one end of the second parallel branch is grounded, and the other end is connected to the output end of the regulating voltage amplifier circuit.

10. The driving circuit for realizing lens zoom without motor drive according to claim 8, characterized in that: The operational amplifier U3A is a common-mode amplifier that only amplifies voltage but not current. The operational amplifier U3B circuit is a current follower that is used to provide output current gain for the voltage of the previous stage.

Images