Drive circuit and electronic device

Abstract

The application discloses a driving circuit and electronic equipment, the driving circuit comprises: a first amplification circuit, comprising a first amplification part and a first thermistor, the first amplification part is used for amplifying a driving waveform signal by a first amplification multiple to obtain a first driving voltage signal, and the first thermistor is used for increasing the first amplification multiple when the temperature rises, so as to compensate for the decrease of a second amplification multiple in the circuit; a second amplification circuit, comprising a second amplification part and a second thermistor, the second amplification part is used for amplifying the first driving voltage signal by a second amplification multiple to obtain a second driving voltage signal, and the second thermistor is used for compensating for the change of a static output of an amplification component in the second amplification part when the temperature rises, so as to ensure that the static output remains unchanged when the temperature changes, meanwhile, the second thermistor reduces the second amplification multiple, and in combination with the compensation of the first amplification multiple, the overall amplification multiple remains unchanged.

Description

Technical Field

[0001] This application relates to the field of electronic equipment technology, specifically to a driving circuit and an electronic device. Background Technology

[0002] The load in electronic devices can have multiple sub-units. Due to the requirement for precise load control, a drive circuit is usually set up for each sub-unit. However, the drive circuit of each sub-unit is susceptible to temperature fluctuations, which can cause the drive voltage to deviate from the target value, resulting in temperature drift. Utility Model Content

[0003] This application provides a driving circuit and electronic device that can reduce the impact of temperature on the driving voltage.

[0004] The technical solution adopted in this application to solve the problem is as follows: On one hand, this application provides a driving circuit, including: The first amplification circuit includes a first amplification section and a first thermistor. The first input terminal of the first amplification section is grounded, and the second input terminal of the first amplification section is connected to a driving waveform signal. The first thermistor is connected between the second input terminal and the output terminal of the first amplification section. The first amplification section is used to amplify the driving waveform signal by a first amplification factor to obtain a first driving voltage signal. The first thermistor is used to increase the first amplification factor when the temperature rises. The second amplification circuit includes a second amplification section and a second thermistor. The control terminal of the second amplification section is connected to the output terminal of the first amplification section. The first terminal of the second amplification section is connected to a first positive power supply, and the second terminal of the second amplification section is connected to a first negative power supply. The second thermistor is connected in series between the second terminal of the second amplification section and the first negative power supply. The second amplification section is used to amplify the first driving voltage signal by a second amplification factor to obtain a second driving voltage signal. The second thermistor is used to compensate for the change in the static output of the amplification component in the second amplification section when the temperature rises, ensuring that the static output remains unchanged when the temperature changes. At the same time, the second thermistor will reduce the second amplification factor. Combined with the compensation of the first amplification factor, the overall amplification factor remains unchanged.

[0005] On the other hand, this application also provides an electronic device including the driving circuit as described in any of the preceding claims. Attached Figure Description

[0006] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0007] Figure 1 This is a block diagram of the DPN circuit provided in an embodiment of this application.

[0008] Figure 2 This is a structural block diagram of a driving circuit provided in an embodiment of this application.

[0009] Figure 3 A circuit diagram of a driving circuit provided in an embodiment of this application.

[0010] Figure 4 This is another structural block diagram of the driving circuit provided in the embodiments of this application.

[0011] Figure 5 Another circuit diagram of the driving circuit provided in the embodiments of this application.

[0012] Figure 6 The diagram shows the simulated output signal of the driving circuit provided in the embodiments of this application under multiple ambient temperatures.

[0013] Figure 7 The output signal of the driving circuit for removing the first and second thermistors provided in the embodiments of this application is shown in the simulation experiment diagram at multiple ambient temperatures. Detailed Implementation

[0014] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0015] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," "third," "fourth," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," "third," "fourth," etc., may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "several" means one or more, unless otherwise explicitly specified.

[0016] In this application, the term "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use this application. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this application can be made without using these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of this application with unnecessary detail. Therefore, this application is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0017] The existing drive circuits for each sub-unit of the load are easily affected by temperature, causing the drive voltage to deviate from the target value and resulting in temperature drift.

[0018] For example, in electronic devices such as printers, the printhead has hundreds or thousands of nozzles. In application, it is required that the volume, velocity, and direction of the ink droplets ejected from each nozzle are basically consistent. Therefore, the drive signal for each nozzle is independently controlled; this is the DPN (Drive Per Nozzle / Drop volume correct Per Nozzle) technology in inkjet printing. The circuit architecture is as follows... Figure 1The adjustable gain amplifier circuit, also known as the drive circuit, is crucial because each nozzle has many nozzles. Independent control circuits occupy significant space, are costly, and consume considerable power. In related technologies, multiple integrated amplifiers are used to build the drive circuit. However, high-voltage amplifiers are relatively rare, and the voltage amplitude is limited (e.g., a maximum of 36V). Furthermore, integrated amplifiers occupy a large area and are expensive. Additionally, the temperature generated by the control circuit board can easily affect the drive voltage, leading to temperature drift. Conversely, the drive circuit for each nozzle is susceptible to temperature fluctuations, such as ambient temperature and board temperature, causing the drive voltage to deviate from the target value and exhibit temperature drift.

[0019] For example, in electronic devices such as display devices, there are multiple LEDs on the LED board. When applying them, it is required that the brightness of each LED bead be consistent. However, in the driving circuit of the LED beads, the driving voltage is prone to deviate from the target value due to the temperature of the board.

[0020] Of course, electronic devices are not limited to the printers and display devices mentioned above, but can also be other electronic devices. The corresponding load is not limited to nozzles and lamp beads, but varies with the type of electronic device. The driving circuit and electronic device of this application embodiment can be applied to scenarios where multiple sub-units of the load need to be driven separately. It should be noted that, in order to maintain consistency, this application embodiment uses the load sub-unit as the load of the driving circuit for description. The load sub-unit means a single sub-unit of the load.

[0021] Based on this, in the embodiments of this application, the driving circuit includes a first amplification circuit and a second amplification circuit. The first amplification circuit includes a first amplification section and a first thermistor. The first input terminal of the first amplification section is grounded, and the second input terminal of the first amplification section is connected to a driving waveform signal. The first thermistor is connected between the second input terminal and the output terminal of the first amplification section. The first amplification section is used to amplify the driving waveform signal by a first amplification factor to obtain a first driving voltage signal. The first thermistor is used to increase the first amplification factor when the temperature rises. The second amplification circuit includes a second amplification section and a second thermistor. The control terminal of the second amplification section is connected to the output terminal of the first amplification section. The first terminal of the second amplification section is connected to a first positive power supply, and the second terminal of the second amplification section is connected to a first negative power supply. The second thermistor is connected in series between the second terminal of the second amplification section and the first negative power supply. The second amplification section is used to amplify the first driving voltage signal by a second amplification factor to obtain a second driving voltage signal. The second thermistor is used to compensate for the change in the static output of the amplification component in the second amplification section when the temperature rises, ensuring that the static output remains unchanged when the temperature changes. At the same time, the second thermistor will reduce the second amplification factor. Combined with the compensation of the first amplification factor, the overall amplification factor remains unchanged. By setting thermistors in two amplifier circuits to compensate for the output voltage, the loss of drive voltage caused by ambient temperature or board temperature can be automatically compensated, reducing the impact of temperature on the drive voltage, thereby achieving stable drive of the load sub-unit.

[0022] The content of this application will be further explained below with reference to the accompanying drawings and the description of the embodiments.

[0023] For example, such as Figure 2 This embodiment provides a driving circuit 100, which is used to drive a sub-unit of a load with a driving voltage signal. For example, the load can be a print head or a lamp board, and the corresponding sub-unit of the load can be a nozzle or an LED. The driving circuit 100 includes a first amplification circuit 110 and a second amplification circuit 120, which can perform two-stage voltage amplification on the input driving waveform signal SIGNAL INPUT.

[0024] For example, the first amplifier circuit 110 includes a first amplification section 112 and a first thermistor R28. The first input terminal of the first amplification section 112 is grounded to GND, and the second input terminal of the first amplification section 112 is connected to the drive waveform signal SIGNAL INPUT. The first thermistor R28 is connected between the second input terminal and the output terminal of the first amplification section 112. The first amplification section 112 is used to amplify the drive waveform signal SIGNAL INPUT by a first amplification factor to obtain a first drive voltage signal. The first thermistor R28 is used to increase the first amplification factor when the temperature rises.

[0025] For example, the second amplification circuit 120 includes a second amplification section 122 and a second thermistor R27. The control terminal of the second amplification section 122 is connected to the output terminal of the first amplification section 112. The first terminal of the second amplification section 122 is connected to the first positive power supply VCC2, and the second terminal of the second amplification section 122 is connected to the first negative power supply VEE2. The second thermistor R27 is connected in series between the second terminal of the second amplification section 122 and the first negative power supply VEE2. The second amplification section 122 is used to amplify the first driving voltage signal by a second amplification factor to obtain the second driving voltage signal. The second thermistor R27 is used to compensate for the change in the static output of the amplification component in the second amplification section 122 when the temperature rises, ensuring that the static output remains unchanged when the temperature changes. At the same time, the second thermistor R27 will reduce the second amplification factor. Combined with the compensation of the first amplification factor, the overall amplification factor remains unchanged.

[0026] In the driving circuit 100 provided in this application embodiment, by setting a first thermistor R28 and a second thermistor R27 in the first amplification circuit 110 and the second amplification circuit 120 respectively, the compensation of the output second driving voltage signal can be realized. It can automatically compensate for the driving voltage loss caused by ambient temperature or board temperature, reduce the influence of temperature on driving voltage, and thus realize stable driving of the sub-unit of the load.

[0027] It should be noted that both the first amplifier circuit 110 and the second amplifier circuit 120 are circuits that amplify the voltage of the input drive waveform signal SIGNAL INPUT. The first amplifier circuit 110 performs primary amplification of the input drive waveform signal SIGNAL INPUT, and the second amplifier circuit 120 amplifies the amplified drive voltage signal again to meet the drive requirements of the load subunit. The structural composition of the first amplifier circuit 110 and the second amplifier circuit 120 will be illustrated below with examples.

[0028] For example, such as Figure 3 The first amplifier circuit 110 can be the primary amplification section built from a common operational amplifier. For example, the first amplification section 112 includes an operational amplifier U2, a first resistor R25, and a second resistor R24.

[0029] The non-inverting and inverting inputs of operational amplifier U2 correspond to the first and second inputs of the first amplifier circuit 110, respectively. Therefore, the non-inverting input of operational amplifier U2 is grounded (GND), the inverting input is connected to the drive waveform signal SIGNAL INPUT, and the output is connected to the control terminal of the second amplification section 122. A first resistor R25 is connected in series between the inverting input and the SIGNAL INPUT input of operational amplifier U2. A second resistor R24 ​​and a first thermistor R28 are connected in series between the inverting input and the output of operational amplifier U2.

[0030] For example, operational amplifier U2 can be selected as an AD8033 general-purpose op-amp. Operational amplifier U2 is also connected to a third positive power supply VCC1 and a third negative power supply VEE1. The voltage of the third positive power supply VCC1 can be +10V, and the voltage of the third negative power supply VEE1 can be -10V. Operational amplifier U2 is an inverting amplifier, and the first amplification factor is (R24+R28) / R25.

[0031] The first thermistor R28 can be a thermistor with a temperature coefficient of 0.003, and the first thermistor R28 increases with the increase of temperature. Therefore, the first amplification factor increases with the increase of temperature.

[0032] To increase the stability of the first amplifier circuit 110, the first amplification section 112 also includes a first capacitor C5. The first capacitor C5 is connected between the inverting input terminal and the output terminal of the operational amplifier U2. The first capacitor C5 can be a Miller capacitor, thereby enhancing the stability of the first amplifier circuit 110.

[0033] In electronic devices, the drive voltage between different load sub-units may need to be fine-tuned to ensure that the operating characteristics of each load sub-unit are consistent.

[0034] For example, the first amplifier circuit 110 further includes a variable resistor R10, which is connected in series with a first thermistor R28. The variable resistor R10 and the first thermistor R28 are connected between the second input terminal and the output terminal of the first amplification section 112. That is, the variable resistor R10 is connected in series with the second resistor R24 ​​and the first thermistor R28 in sequence, and the second resistor R24, the first thermistor R28 and the variable resistor R10 are connected between the inverting input terminal and the output terminal of the operational amplifier U2. Thus, the first amplification factor is (R24+R28+R10) / R25.

[0035] The variable resistor R10 is an adjustable resistor, which can be implemented using an analog resistor or an electronic positioner. This allows for fine-tuning of different load sub-units, and thus, independent adjustment of the first amplification factor. For example, in the case of a printer where the load sub-unit is the nozzle of the printhead, the first amplification factor can be independently adjusted for different nozzles, thereby fine-tuning the amount of ink droplets ejected by each nozzle to improve the consistency of ink droplet ejection from each nozzle.

[0036] For example, please continue reading Figure 3 The second amplifier circuit 120 is a high-voltage amplification section, such as a common-emitter amplifier. The second amplification section 122 includes a first switching transistor Q4, a third resistor R2, and a fourth resistor R6.

[0037] The control terminal of the first switching transistor Q4 is connected to the output terminal of the first amplification section 112. The first terminal of the first switching transistor Q4 is connected to the first positive power supply VCC2, and the second terminal of the first switching transistor Q4 is connected to the first negative power supply VEE2. The third resistor R2 is connected in series between the first positive power supply VCC2 and the first terminal of the first switching transistor Q4. The fourth resistor R6 and the second thermistor R27 are connected in series, and the fourth resistor R6 and the second thermistor R27 are connected between the second terminal of the first switching transistor Q4 and the first negative power supply VEE2.

[0038] The first positive power supply VCC2 can be configured according to the output voltage requirements, while the first negative power supply VEE2 serves as the bias power supply for the circuit, adjusting the output zero point of the second amplifier circuit 120. For example, in the case where the printer's load subunit is a nozzle, the voltage of the first positive power supply VCC2 can be 40V, and the voltage of the first negative power supply VEE2 can be -5.54V. The second amplification factor is determined by the third resistor R2, the fourth resistor R6, and the second thermistor R27, and the second amplification factor is R2 / (R6+R27).

[0039] It should be noted that in related technologies, multiple integrated amplifiers are used to build the driving circuit. On the one hand, high-voltage amplifiers are relatively rare, and on the other hand, the voltage amplitude is also limited, for example, the maximum voltage is 36V. Furthermore, integrated amplifiers occupy a large area and are expensive.

[0040] Based on this, the embodiments of this application employ a first switching transistor Q4 to amplify the voltage, and the withstand voltage of the first switching transistor Q4 can be greater than or equal to 50V. For example, the first switching transistor Q4 can be a transistor, with its control terminal, first terminal, and second terminal corresponding to the base, collector, and emitter of the transistor, respectively. The maximum withstand voltage of the transistor is 65V, which can cover a wide range of voltage requirements for piezoelectric nozzles. Of course, the first switching transistor Q4 is not limited to a transistor; it can also be a field-effect transistor, IGBT, etc. The above description uses a transistor as an example and should not be construed as a limitation on the first switching transistor Q4.

[0041] Compared to integrated amplifiers, the embodiments of this application use a first switching transistor Q4, such as a transistor, in the high-voltage amplification section to amplify the voltage. On the one hand, the withstand voltage of the transistor can reach 65V, which is higher than the output voltage of 36V of ordinary integrated amplifiers, and can cover the voltage requirements of load subunits such as piezoelectric nozzles in a wide range. On the other hand, there are few and expensive integrated amplifiers on the market with outputs exceeding 30V, while the first switching transistor Q4, such as a transistor, in the embodiments of this application is more common and can be packaged in SOT (small outline transistor), which is compact in size, can reduce the size of the circuit board, and also reduce the manufacturing cost.

[0042] Continuing with the example of the first switching transistor Q4, when the temperature rises, the voltage difference Vbe between the base and emitter of the transistor will decrease, and similarly, the voltage difference Vce between the collector and emitter of the transistor will also decrease. The fact that Vce decreases with increasing temperature means that when the input is a 0 level, the output voltage of the common-emitter amplifier, i.e. the second amplifier circuit 120, will decrease at different temperatures, thus causing the temperature drift problem.

[0043] The second thermistor R27 has a temperature coefficient of 0.003 and increases with increasing temperature. Therefore, as temperature rises, the resistance of the second thermistor R27 increases, compensating for changes in Vce, ensuring that the output of the common-emitter amplifier (second amplifier circuit 120) remains constant even with a 0-level input at the front end. However, changes in the second thermistor R27 cause changes in the second amplification factor, affecting the amplification of the input signal. Therefore, the first thermistor R28 in the adjustable primary amplification section (first amplifier circuit 110) plays a compensating role. The first thermistor R28 increases with temperature, thus providing gain compensation for the signal input to the second amplifier circuit 120. Therefore, under the action of the first thermistor R28 and the second thermistor R27, a consistent output can be maintained for different ambient temperatures. In other words, when the temperature rises, the second amplification factor decreases, compensating for the increase in the first amplification factor, and thus compensating for the output second drive voltage signal, reducing the impact of temperature rise on the output drive voltage.

[0044] For the drive output section, an amplifier circuit can also be set up to achieve a stable output of the drive voltage signal.

[0045] For example, such as Figure 4 The driving circuit 100 also includes a third amplifier circuit 130. The input terminal of the third amplifier circuit 130 is connected to the first terminal of the second amplification section 122. The third amplifier circuit 130 is used to amplify the current of the second driving voltage signal.

[0046] like Figure 5 For example, the third amplifier circuit 130 may include a second switch M2, a third switch M3, and a fifth resistor R7.

[0047] The control terminal of the second switch M2 is connected to the first terminal of the second amplifier section 122. The first terminal of the second switch M2 is connected to the second positive power supply VCC3. The second terminal of the second switch M2 is connected to the first terminal of the third switch M3. The second terminal of the third switch M3 is connected to the second negative power supply VEE3. The control terminal of the third switch M3 is grounded to GND. The fifth resistor R7 is connected in series between the second terminal of the third switch M2 and the second negative power supply VEE3.

[0048] For example, in the case where the electronic device is a printer and the load subunit is a nozzle, the voltage of the second positive power supply VCC3 can be 40V and the voltage of the second negative power supply VEE3 can be -3V.

[0049] For example, both the second switch M2 and the third switch M3 can be MOSFETs, such as enhancement-mode NMOSFETs. The control terminal, first terminal, and second terminal of the second switch M2 correspond to the gate, drain, and source of the MOSFET, respectively. The control terminal, first terminal, and second terminal of the third switch M3 correspond to the gate, drain, and source of the MOSFET, respectively.

[0050] It should be noted that the second switch M2 and the second positive power supply VCC3 act as a source follower, rapidly following the input voltage, i.e., the second drive voltage signal, and amplifying the output current. The third switch M3, the fifth resistor R7, and the second negative power supply VEE3 form a constant current source. The function of this constant current source is to provide a discharge path for the downstream load sub-unit when the output voltage drops, enabling the voltage to follow quickly.

[0051] Among them, resistor R1 and second capacitor C1 act as load sub-units, which are also the nozzles for printers.

[0052] The operation of the third amplifier circuit 130 can be summarized as follows: The third switch M3 provides a bias for the slight conduction of the second switch M2, ensuring a 0V output when there is no external input. When the drive waveform signal SIGNALINPUT is input to the drive circuit 100, the rising portion of the waveform corresponds to the increase in the output signal of the drive circuit 100, charging the second capacitor C1 of the load subunit. The charging current for the second capacitor C1 is provided by the second positive power supply VCC3 through the second switch M2. When the drive waveform signal SIGNAL INPUT is input to the drive circuit 100, the falling portion of the waveform corresponds to the decrease in the output signal of the drive circuit 100, discharging the second capacitor C1 of the load subunit. The second switch M2 is turned off, and the second capacitor C1 discharges to the second negative power supply VEE3 through the third switch M3.

[0053] For example, please continue reading Figure 5 The driving circuit 100 also includes a sixth resistor R8 and a seventh resistor R23. The sixth resistor R8 is connected between the output terminal of the third amplifier circuit 130 and the first input terminal of the first amplifier section 112, and the seventh resistor R23 is connected in series between the first input terminal of the first amplifier section 112 and ground GND. The sixth resistor R8 and the seventh resistor R23 form a feedback network, which can stabilize the overall amplification factor of the driving circuit 100.

[0054] The working process of the driving circuit 100 provided in this application embodiment is as follows: the driving waveform signal SIGNAL INPUT is used as a signal source and is input to the primary amplifier, i.e., the first amplifier circuit 110. Then it enters the common emitter amplifier, i.e., the second amplifier circuit 120. Finally, it is output through the source follower of the driving output, i.e., the third amplifier circuit 130. The sixth resistor R8 feeds back the input signal to the input terminal of the primary amplifier circuit, i.e., the first amplifier circuit 110. The sixth resistor R8 has a stabilizing effect on the amplification of the output.

[0055] Taking the printer nozzle as the load subunit as an example, the first amplifier circuit 110, the second amplifier circuit 120, and the third amplifier circuit 130 are all independent in the DPN circuit for each nozzle in the printhead. Therefore, there are many drive circuits 100 in the DPN circuit. The drive circuits 100 in this embodiment are all ordinary components, which can reduce costs. Furthermore, since there are few integrated amplifier circuits with outputs exceeding 30V on the market, and they are very expensive, the drive circuit 100 in this embodiment can cover the requirements of piezoelectric nozzles with the voltage range of the second amplifier circuit 120, i.e., the common-emitter amplifier circuit, while maintaining low cost. In addition, in the drive circuit 100 of this embodiment, the first switch Q4, the second switch M2, and the third switch M3 can all be selected in SOT packages, which are compact in size, and can reduce the size of the circuit board for the DPN circuit.

[0056] To verify the effect of the first and second thermistors on temperature compensation in the embodiments of this application, the output signal waveforms of the driving circuit 100 were simulated under five ambient temperatures: 25°C, 50°C, 80°C, 120°C, and 150°C. The output waveforms of the driving circuit with and without the PTC compensation resistor were compared. Figure 6 and Figure 7 It can be seen that Figure 6 In the driving circuit with PTC compensation resistor, namely the driving circuit 100 of this application embodiment, the output waveform remains basically consistent under different ambient temperatures, and the waveforms are basically overlapping. Figure 7 In a drive circuit without a PTC compensation resistor, the output waveform will have a certain deviation under different ambient temperatures.

[0057] This application also provides an electronic device, which includes the aforementioned driving circuit and load subunit. One end of the load subunit is connected to the output terminal of the driving circuit, and the other end of the load subunit is grounded. The input terminal of the driving circuit is connected to a driving waveform signal. The electronic device may be a printer, a display device, etc., and the load subunit may be a nozzle of a printhead, an LED bead of a lamp board, etc. The structure and working principle of the driving circuit are as described in the above embodiments. Since this electronic device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, and will not be described in detail here.

[0058] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the detailed descriptions of other embodiments above, which will not be repeated here.

[0059] In practice, each of the above units or structures can be implemented as an independent entity or can be arbitrarily combined to be implemented as the same or several entities. For the specific implementation of each of the above units or structures, please refer to the previous method embodiments, which will not be repeated here.

[0060] For details on the implementation of each of the above operations, please refer to the previous examples, which will not be repeated here.

[0061] The driving circuit and electronic device provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A driving circuit, characterized in that, include: The first amplification circuit includes a first amplification section and a first thermistor. The first input terminal of the first amplification section is grounded, and the second input terminal of the first amplification section is connected to a driving waveform signal. The first thermistor is connected between the second input terminal and the output terminal of the first amplification section. The first amplification section is used to amplify the driving waveform signal by a first amplification factor to obtain a first driving voltage signal. The first thermistor is used to increase the first amplification factor when the temperature rises. The second amplification circuit includes a second amplification section and a second thermistor. The control terminal of the second amplification section is connected to the output terminal of the first amplification section. The first terminal of the second amplification section is connected to a first positive power supply, and the second terminal of the second amplification section is connected to a first negative power supply. The second thermistor is connected in series between the second terminal of the second amplification section and the first negative power supply. The second amplification section is used to amplify the first driving voltage signal by a second amplification factor to obtain a second driving voltage signal. The second thermistor is used to compensate for the change in the static output of the amplification component in the second amplification section when the temperature rises, ensuring that the static output remains unchanged when the temperature changes. At the same time, the second thermistor will reduce the second amplification factor. Combined with the compensation of the first amplification factor, the overall amplification factor remains unchanged.

2. The driving circuit according to claim 1, characterized in that, The first amplification section includes an operational amplifier, a first resistor, and a second resistor; The non-inverting input of the operational amplifier is grounded, the inverting input of the operational amplifier is connected to the driving waveform signal, and the output of the operational amplifier is connected to the control terminal of the second amplification section; the first resistor is connected in series between the inverting input of the operational amplifier and the driving waveform signal input terminal, the second resistor and the first thermistor are connected in series, and the second resistor and the first thermistor are connected between the inverting input and the output of the operational amplifier.

3. The driving circuit according to claim 2, characterized in that, The first enlarged section also includes: The first capacitor is connected between the inverting input terminal and the output terminal of the operational amplifier.

4. The driving circuit according to claim 1, characterized in that, The first amplifier circuit further includes: A variable resistor is connected in series with the first thermistor, and the variable resistor and the first thermistor are connected between the second input terminal and the output terminal of the first amplification section.

5. The driving circuit according to claim 1, characterized in that, The second amplification section includes a first switching transistor, a third resistor, and a fourth resistor; The control terminal of the first switching transistor is connected to the output terminal of the first amplification section, the first terminal of the first switching transistor is connected to the first positive power supply, the second terminal of the first switching transistor is connected to the first negative power supply, the third resistor is connected in series between the first positive power supply and the first terminal of the first switching transistor, the fourth resistor and the second thermistor are connected in series, and the fourth resistor and the second thermistor are connected between the second terminal of the first switching transistor and the first negative power supply.

6. The driving circuit according to claim 5, characterized in that, The withstand voltage of the first switching transistor is greater than or equal to 50V.

7. The driving circuit according to claim 1, characterized in that, The driving circuit also includes: A third amplifier circuit is connected to the first terminal of the second amplification section, and the third amplifier circuit is used to amplify the current of the second driving voltage signal.

8. The driving circuit according to claim 7, characterized in that, The third amplifier circuit includes a second switching transistor, a third switching transistor, and a fifth resistor; The control terminal of the second switch is connected to the first terminal of the second amplification section, the first terminal of the second switch is connected to the second positive power supply, the second terminal of the second switch is connected to the first terminal of the third switch, the second terminal of the third switch is connected to the second negative power supply, the control terminal of the third switch is grounded, and the fifth resistor is connected in series between the second terminal of the third switch and the second negative power supply.

9. The driving circuit according to claim 7, characterized in that, The driving circuit also includes: The sixth resistor is connected between the output terminal of the third amplifier circuit and the first input terminal of the first amplifier section; The seventh resistor is connected in series between the first input terminal of the first amplifier section and ground.

10. An electronic device, characterized in that, Includes the drive circuit as described in any one of claims 1 to 9.

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