Integrated excitation power amplification circuit

Abstract

The utility model provides an integrated excitation power amplification circuit. The integrated excitation power amplification circuit comprises a power amplifier, a first resistor module, a first RC module and a second RC module, wherein the input end of the first resistor module is connected with a voltage source; the output end of the first resistor module is connected with the positive input end of the power amplifier; wherein a current amplification circuit constructed based on an operational amplifier is integrated in the power amplifier; the negative input end of the power amplifier is connected with a motor controller through the first RC module; and the negative input end of the power amplifier is also connected with the output end of the power amplifier through the second RC module. According to the excitation power amplification circuit, the reliability and the stability of excitation signals can be improved on the basis of simplifying the existing excitation power amplification circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of electronics, in particular to an integrated excitation power amplifier circuit. Background Art

[0002] A resolver module (RTM) is an electrical device used to measure rotational motion, angle, or position changes. It is an essential component in motor drive systems, providing precise position and velocity feedback to ensure accurate, stable, and efficient motor control. A resolver module primarily consists of two components: a resolver excitation signal and a resolver recovery signal. The resolver excitation signal amplifies the low-power signal from the microcontroller unit to drive the resolver sensor's excitation coil. The quality of the excitation signal directly affects the subsequent recovery signal, so ensuring the stability and accuracy of the excitation signal is crucial.

[0003] Traditional excitation power amplifier circuits typically consist of an inverting amplifier for voltage amplification and a push-pull circuit for current amplification, often using multiple discrete components such as diodes and transistors. However, these multiple discrete components complicate the circuit and take up space on the PCB. This not only increases component cost but also complicates circuit design and routing. Furthermore, the excessive number of discrete components increases potential points of failure. Failure of a single component can cause the entire system to shut down or fail, reducing overall system reliability. In practical applications, interactions between components can introduce noise and distortion, significantly reducing the final amplification effect and, in turn, affecting the quality of the excitation signal. Utility Model Content

[0004] The utility model aims to provide an integrated excitation power amplifier circuit to solve the above technical problems and improve the reliability and stability of the excitation signal on the basis of simplifying the existing excitation power amplifier circuit.

[0005] In order to solve the above technical problems, the present invention provides an integrated excitation power amplifier circuit, including: a power amplifier, a first resistance module, a first RC module and a second RC module. Specifically:

[0006] The input end of the first resistance module is connected to a voltage source;

[0007] The output end of the first resistance module is connected to the positive input end of the power amplifier;

[0008] The negative input terminal of the power amplifier is connected to the motor controller through the first RC module;

[0009] The negative input terminal of the power amplifier is also connected to the output terminal of the power amplifier through the second RC module.

[0010] In the above scheme, the input of the first resistor module is connected to a voltage source, which can be used to set the input voltage ratio and the amplitude of the excitation signal. The output of the first resistor module is connected to the positive input of the power amplifier, forming a voltage amplification stage. Leveraging the high gain characteristics of the power amplifier, the input signal voltage can be effectively increased. A current amplifier circuit based on an operational amplifier is integrated within the power amplifier, giving the power amplifier the current amplification function of a push-pull circuit. Integrating the operational amplifier and transistor within a single power amplifier significantly reduces the number of components and the complexity of external wiring, facilitating miniaturization and high-density PCB design. This reduces component count and reduces the risk of failure. The negative input of the power amplifier is connected to the motor controller via a first RC module, forming a feedback mechanism. This configuration allows current regulation based on negative feedback, thereby improving system stability and response speed. A second RC module is connected to the output of the power amplifier, providing further feedback to further adjust the output for optimized performance. This design achieves more precise gain control, enhances bandwidth, and improves frequency response. Using the power amplifier, resistor module, and RC module as an integrated circuit reduces the number of discrete components and simplifies circuit design. The integrated excitation power amplifier circuit utilizes a combination of a power amplifier and an RC module. This not only simplifies circuit design, saves space, and improves reliability, but also optimizes the actual signal processing process. By controlling feedback and adjusting gain, a higher-quality excitation signal can be obtained, adapting to a wider range of application scenarios.

[0011] In one implementation, the power amplifier integrates a current amplification circuit based on an operational amplifier, specifically:

[0012] The current amplifying circuit includes an operational amplifier, a first triode and a second triode;

[0013] The positive input terminal of the operational amplifier is connected to the positive input terminal of the power amplifier;

[0014] The negative input terminal of the operational amplifier is connected to the negative input terminal of the power amplifier;

[0015] The output end of the operational amplifier is connected to the base of the first transistor and the base of the second transistor;

[0016] The emitter of the first transistor is connected to the power supply terminal of the power amplifier;

[0017] The collector of the first transistor is connected to the emitter of the second transistor and the output end of the power amplifier;

[0018] The emitter of the second transistor is connected to the ground terminal of the power amplifier.

[0019] In one implementation, the first transistor is an NPN transistor; the second transistor is a PNP transistor.

[0020] In one implementation, the first resistor module includes a first resistor and a second resistor, specifically:

[0021] The first end of the first resistor is connected to the voltage source;

[0022] The second end of the first resistor is connected to the first end of the second resistor and the positive input terminal of the power amplifier;

[0023] A second end of the second resistor is grounded.

[0024] In one implementation, the first RC module includes a third resistor and a first capacitor, specifically:

[0025] A first end of the third resistor is connected to an output end of the motor controller;

[0026] The first end of the third resistor is connected to the first end of the first capacitor and the negative input terminal of the power amplifier;

[0027] The second terminal of the first capacitor is grounded.

[0028] In one implementation, the second RC module includes a fourth resistor and a second capacitor, specifically:

[0029] The first end of the fourth resistor is connected to the negative input terminal of the power amplifier and the first end of the second capacitor;

[0030] The second end of the fourth resistor and the second end of the second capacitor are connected to the output end of the power amplifier.

[0031] In one implementation, the integrated excitation power amplifier circuit further includes a third capacitor, specifically:

[0032] The first end of the third capacitor is connected to the second end of the first resistor and the first end of the second resistor;

[0033] The second end of the third capacitor is connected to the positive input end of the power amplifier.

[0034] In one implementation, the integrated excitation power amplifier circuit further includes a fourth capacitor, specifically:

[0035] The first end of the fourth capacitor is connected to the output end of the power amplifier, the second end of the fourth resistor, and the second end of the second capacitor;

[0036] A second terminal of the fourth capacitor is grounded. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the connection relationship of an integrated excitation power amplifier circuit provided in one embodiment of the present utility model;

[0038] Figure 2 The figure is a schematic diagram of the internal connection relationship of a power amplifier provided in one embodiment of the present utility model. DETAILED DESCRIPTION

[0039] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0040] The terms "first," "second," and the like in the specification, claims, and drawings of this application are used to distinguish between different objects, not to describe a particular order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements, but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0041] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0042] First, some terms in this application are explained to facilitate understanding by those skilled in the art.

[0043] (1) Discrete components: These are electronic components that are used independently as separate components in an electronic circuit, rather than being integrated into a single chip or module. Common discrete components include transistors, diodes, and inductors.

[0044] Example 1

[0045] See also Figure 1 , Figure 1 Schematic diagram of the connection relationship of an integrated excitation power amplifier circuit provided in one embodiment of the present invention. The present invention provides an integrated excitation power amplifier circuit, including: a power amplifier, a first resistor module 101, a first RC module 102 and a second RC module 103. Specifically:

[0046] The input end of the first resistance module 101 is connected to the voltage source VCC;

[0047] The output end of the first resistance module 101 is connected to the positive input end of the power amplifier;

[0048] The negative input terminal of the power amplifier is connected to the motor controller through the first RC module 101;

[0049] The negative input terminal of the power amplifier is also connected to the output terminal of the power amplifier through the second RC module 102 .

[0050] See also Figure 2 , Figure 2 This is a schematic diagram of the internal connection relationship of a power amplifier provided in one embodiment of the present utility model. In one embodiment, the power amplifier integrates a current amplification circuit constructed based on an operational amplifier, specifically: the current amplification circuit includes an operational amplifier OPAMP, a first transistor, and a second transistor; the positive input terminal of the operational amplifier OPAMP is connected to the positive input terminal of the power amplifier OPAMP; the negative input terminal of the operational amplifier OPAMP is connected to the negative input terminal of the power amplifier OPAMP; the output terminal of the operational amplifier OPAMP is connected to the base of the first transistor and the base of the second transistor; the emitter of the first transistor is connected to the power supply terminal of the power amplifier OPAMP; the collector of the first transistor is connected to the emitter of the second transistor and the output terminal of the power amplifier; the emitter of the second transistor is connected to the ground terminal of the power amplifier OPAMP. Furthermore, the first transistor is an NPN transistor; and the second transistor is a PNP transistor.

[0051] In an embodiment of the present invention, the positive and negative inputs of the operational amplifier are connected to the positive and negative inputs of the power amplifier, respectively. The differential amplification based on the operational amplifier ensures high gain and good linearity, enabling accurate amplification of weak signals. The output of the operational amplifier is connected to the base of a first transistor (NPN transistor) and the base of a second transistor (PNP transistor). The first transistor is responsible for amplifying the base signal into a larger collector current to drive the load; the second transistor assists the first transistor in forming a push-pull output structure during operation to ensure that both positive and negative half-cycle signals are effectively amplified. Through the push-pull design, the circuit can process both positive and negative half-cycle signals, thereby improving the efficiency and accuracy of the entire signal amplification process. Integrating the operational amplifier and transistors within a power amplifier significantly reduces the number of components and the complexity of external wiring, facilitating miniaturization and high-density PCB design, reducing the number of components and reducing the risk of failure. The integrated modular design eliminates the potential open-circuit or short-circuit failures of discrete components, thereby enhancing the reliability and stability of the system.

[0052] In one embodiment, the first resistor module 101 includes a first resistor R1 and a second resistor R2. Specifically, a first end of the first resistor R1 is connected to the voltage source VCC; a second end of the first resistor R1 is connected to a first end of the second resistor R2 and a positive input end of the power amplifier; and a second end of the second resistor R2 is grounded.

[0053] In this embodiment of the present invention, the first end of a first resistor R1 is connected to a voltage source VCC, and the second end is connected to one end of a second resistor R2 and the positive input terminal of the power amplifier (the non-inverting input of the power amplifier). The first resistor R1 and the second resistor R2 form a voltage divider. By adjusting the values ​​of the first resistor R1 and the second resistor R2, the input signal level flowing into the power amplifier can be controlled. This configuration ensures that the input terminal of the power amplifier can obtain the appropriate voltage, ensuring that the amplifier operates within the appropriate linear range.

[0054] In one embodiment, the first RC102 module includes a third resistor R5 and a first capacitor C4, specifically:

[0055] The first end of the third resistor R5 is connected to the output end of the motor controller; the first end of the third resistor R5 is connected to the first end of the first capacitor C4 and the negative input end of the power amplifier; the second end of the first capacitor C4 is grounded.

[0056] The main control chip of the motor controller sends out two APWM wave signals, which are input into a power amplifier circuit provided by an embodiment of the present invention through an intermediate stage circuit. The intermediate stage circuit is a two-stage RC filter circuit, and the output signal after passing through the intermediate stage circuit and the power amplifier circuit is a two-way differential sine wave signal that is power amplified and filtered. In the embodiment of the present invention, the first end of the third resistor R5 is connected to the output end of the motor control end, which can provide a resistance component. By adjusting the resistance value, it can play a role in current limiting and adjusting the gain of the power amplifier. The first capacitor C4 and the third resistor R5 form an RC network, which can adjust the frequency response of the circuit, realize filtering and phase correction, perform frequency selection and filtering on the input signal, and ensure signal stability and reduced distortion.

[0057] In one embodiment, the second RC module 103 includes a fourth resistor and a second capacitor, specifically:

[0058] The first end of the fourth resistor R6 is connected to the negative input end of the power amplifier and the first end of the second capacitor C7; the second end of the fourth resistor R6 and the second end of the second capacitor C7 are connected to the output end of the power amplifier.

[0059] In an embodiment of the present invention, a fourth resistor R6 is added to the negative feedback loop of the power amplifier. By adjusting the resistance value of the fourth resistor R6, the gain of the power amplifier can be adjusted. The fourth resistor R6 can reduce the noise amplification caused by the high gain of the power amplifier, improve the quality of the signal, and can also limit the current passing through the feedback path of the power amplifier, preventing excessive current from flowing into the power amplifier, thereby protecting the safety of the circuit. Furthermore, the second capacitor C7 and the fourth resistor R6 together form an RC low-pass filter, the cut-off frequency of which is determined by the values ​​of the fourth resistor R6 and the second capacitor C7. This filter can effectively filter high-frequency noise, thereby improving the quality of the signal. In the negative feedback circuit, the series RC circuit composed of C7 and R6 can be used for phase compensation, by optimizing the phase response of the circuit, improving the stability of the system, and especially avoiding the occurrence of oscillation. The presence of C7 can improve the response characteristics of the power amplifier during transient load changes, by absorbing transient voltage or current changes, so that the output voltage can transition smoothly.

[0060] The calculation formula for the power amplifier at the positive input terminal, i.e., the non-inverting terminal, is Vp × R2 / (R1 + R2) = V+. The calculation formula for the power amplifier at the negative input terminal, i.e., the inverting terminal, is (Vout - V-) / R6 = (V- - Vin) / R5. According to the virtual short principle of the power amplifier, V- = V+, where Vp is the power supply of the power amplifier, Vin is the inverting input voltage of the power amplifier, V+ is the non-inverting terminal voltage of the power amplifier, and Vout is the output voltage of the power amplifier. Combining the above formulas, we can know that the output voltage of the power amplifier, Vout, = (Vp × R2 (R5 + R6) - Vin × R6 (R1 + R2)) / R5 (R1 + R2).

[0061] In one embodiment, the integrated excitation power amplifier circuit further includes a third capacitor C1. Specifically, a first end of the third capacitor C1 is connected to the second end of the first resistor R1 and the first end of the second resistor R2; and a second end of the third capacitor C1 is connected to the positive input terminal of the power amplifier.

[0062] In this embodiment of the present invention, third capacitor C1 can be used for DC isolation, preventing the influence of DC bias on the signal. By allowing the AC signal to pass through it while blocking the DC component, the positive input terminal of the power amplifier receives only the AC component. It also smoothes and shapes the input signal, stabilizing the operating state of the power amplifier and thus enhancing its overall steady-state performance. This coupling method helps to effectively transmit signals without affecting the DC operating point.

[0063] In one embodiment, the integrated excitation power amplifier circuit further includes a fourth capacitor C3. Specifically, a first end of the fourth capacitor C3 is connected to the output end of the power amplifier, the second end of the fourth resistor R6, and the second end of the second capacitor C7; and a second end of the fourth capacitor C3 is grounded.

[0064] In an embodiment of the present invention, one end of the fourth capacitor C3 is connected to the output of the power amplifier, which helps to smooth the signal output by the power amplifier, making the waveform more continuous and reducing fluctuations. In particular, in motor control applications, transient stability and control response speed are very important. The fourth capacitor C3 can provide a short-term charge to cope with sudden load changes. The second end of the fourth capacitor C3 is grounded. By grounding, the DC current of the output feedback path cannot pass completely, thereby forming a voltage buffer at the output of the power amplifier. This configuration makes the output voltage less susceptible to transient changes, improves the steady-state performance of the circuit, and makes it more reliable during continuous operation.

[0065] An embodiment of the present invention provides an integrated excitation power amplifier circuit. In the above-mentioned scheme, the input of the first resistor module is connected to a voltage source, which can be used to set the input voltage ratio and the amplitude of the excitation signal. The output of the first resistor module is connected to the positive input of the power amplifier, forming a voltage amplification stage. Leveraging the high gain characteristics of the power amplifier, the voltage of the input signal can be effectively increased. A current amplifier circuit based on an operational amplifier is integrated within the power amplifier, enabling the power amplifier to perform current amplification functions similar to a push-pull circuit. Integrating the operational amplifier and transistor within a single power amplifier significantly reduces the number of components and the complexity of external wiring, facilitating miniaturization and high-density PCB design. This reduces the number of components and reduces the risk of failure. The negative input of the power amplifier is connected to the motor controller via a first RC module, forming a feedback mechanism. This configuration allows current to be adjusted based on negative feedback, thereby improving system stability and response speed. A second RC module is connected to the output of the power amplifier, providing further feedback to further adjust the output to optimize performance. This design enables more precise gain control, enhances bandwidth, and improves frequency response. The use of a power amplifier, resistor module, and RC module within an integrated circuit reduces the number of discrete components and simplifies circuit design. The integrated excitation power amplifier circuit utilizes a combination of a power amplifier and an RC module. This not only simplifies circuit design, saves space, and improves reliability, but also optimizes the actual signal processing process. By controlling feedback and adjusting gain, a higher-quality excitation signal can be obtained, adapting to a wider range of application scenarios.

[0066] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. An integrated excitation power amplifier circuit, characterized in that: include: The power amplifier, the first resistance module, the first RC module and the second RC module are specifically: The input end of the first resistance module is connected to a voltage source; The output end of the first resistance module is connected to the positive input end of the power amplifier; wherein the power amplifier is integrated with a current amplification circuit constructed based on an operational amplifier; The negative input terminal of the power amplifier is connected to the motor controller through the first RC module; The negative input terminal of the power amplifier is also connected to the output terminal of the power amplifier through the second RC module.

2. The integrated excitation power amplifier circuit according to claim 1, characterized in that: The power amplifier is integrated with a current amplification circuit based on an operational amplifier, specifically: The current amplifying circuit includes an operational amplifier, a first triode and a second triode; The positive input terminal of the operational amplifier is connected to the positive input terminal of the power amplifier; The negative input terminal of the operational amplifier is connected to the negative input terminal of the power amplifier; The output end of the operational amplifier is connected to the base of the first transistor and the base of the second transistor; The emitter of the first transistor is connected to the power supply terminal of the power amplifier; The collector of the first transistor is connected to the emitter of the second transistor and the output end of the power amplifier; The emitter of the second transistor is connected to the ground terminal of the power amplifier.

3. The integrated excitation power amplifier circuit according to claim 2, characterized in that: The first transistor is an NPN transistor; The second transistor is a PNP transistor.

4. The integrated excitation power amplifier circuit according to claim 1, characterized in that: The first resistor module includes a first resistor and a second resistor, specifically: The first end of the first resistor is connected to the voltage source; The second end of the first resistor is connected to the first end of the second resistor and the positive input terminal of the power amplifier; A second end of the second resistor is grounded.

5. The integrated excitation power amplifier circuit according to claim 1, characterized in that: The first RC module includes a third resistor and a first capacitor, specifically: A first end of the third resistor is connected to an output end of the motor controller; The first end of the third resistor is connected to the first end of the first capacitor and the negative input terminal of the power amplifier; The second terminal of the first capacitor is grounded.

6. The integrated excitation power amplifier circuit according to claim 1, characterized in that: The second RC module includes a fourth resistor and a second capacitor, specifically: The first end of the fourth resistor is connected to the negative input terminal of the power amplifier and the first end of the second capacitor; The second end of the fourth resistor and the second end of the second capacitor are connected to the output end of the power amplifier.

7. The integrated excitation power amplifier circuit according to claim 4, characterized in that: The integrated excitation power amplifier circuit further includes a third capacitor, specifically: The first end of the third capacitor is connected to the second end of the first resistor and the first end of the second resistor; The second end of the third capacitor is connected to the positive input end of the power amplifier.

8. The integrated excitation power amplifier circuit according to claim 6, characterized in that: The integrated excitation power amplifier circuit further includes a fourth capacitor, specifically: The first end of the fourth capacitor is connected to the output end of the power amplifier, the second end of the fourth resistor, and the second end of the second capacitor; A second terminal of the fourth capacitor is grounded.

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