Rotary transformer excitation circuit and motor controller
By introducing in-phase and out-of-phase amplifier circuits into the resolver excitation circuit, combined with a dual-power supply filtering method, the problem of numerous components in the resolver excitation circuit is solved, thereby reducing the cost and increasing the power density of the motor controller.
Patent Information
- Application Number
- CN202423093796.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2034-12-13
AI Technical Summary
The resolver excitation circuit requires multiple devices for filtering and amplification, resulting in high cost and low power density of the motor controller.
The differential excitation signal is generated by using a non-inverting amplifier circuit and an inverting amplifier circuit, and a filter circuit is used to reduce the number of components. A dual power supply method is used to filter out the DC bias signal.
The number of components in the resolver excitation circuit is reduced, the cost of the motor controller is reduced, and the power density is increased, while the anti-interference and reliability are improved.
Smart Images
Figure CN223786033U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to signal processing technical field especially relates to a kind of rotary transformer excitation circuit and motor controller. BACKGROUND
[0002] At present, in motor controller, rotary transformer excitation circuit carries out filtering, amplification to the received excitation modulation signal, and outputs differential excitation signal to rotary transformer excitation winding;When excitation signal acts on rotary transformer excitation winding, rotary transformer feedback winding generates sinusoidal feedback signal and cosine feedback signal;Sinusoidal feedback signal and cosine feedback signal are input to main control chip after conditioning, and main control chip obtains speed and position information by analyzing sinusoidal feedback signal and cosine feedback signal.
[0003] However, rotary transformer excitation circuit receives two excitation modulation signals, and each excitation modulation signal needs to be filtered separately, so that the devices required by rotary transformer excitation circuit are more, so as to be not conducive to the cost reduction and power density improvement of motor controller.
[0004] Therefore, how to reduce the devices required by rotary transformer excitation circuit is a technical problem to be solved. UTILITY MODEL CONTENT
[0005] Therefore, the utility model provides a kind of rotary transformer excitation circuit and motor controller to reduce the devices required by rotary transformer excitation circuit.
[0006] To achieve the above purpose, the utility model embodiment provides the following technical scheme:
[0007] One aspect of the present application provides a kind of rotary transformer excitation circuit, comprising: filter circuit, same phase amplification circuit and opposite phase amplification circuit;Wherein:
[0008] the input end of the filter circuit is as the input end of the rotary transformer excitation circuit;
[0009] the output end of the filter circuit is connected with the input end of the same phase amplification circuit, the input end of the opposite phase amplification circuit respectively;
[0010] the output end of the same phase amplification circuit, the output end of the opposite phase amplification circuit is as the two output ends of the rotary transformer excitation circuit, and is connected with the two receiving ends of rotary transformer excitation winding.
[0011] Optionally, the filter circuit, the same phase amplification circuit and the opposite phase amplification circuit all adopt the power supply mode of double power supply;
[0012] the filter circuit includes band-pass filter circuit, and the low-pass cutoff frequency of the band-pass filter circuit is greater than zero.
[0013] Optionally, the filter circuit comprises a band-pass filter circuit, and a bandwidth of the band-pass filter circuit is less than a preset value.
[0014] Optionally, each of the in-phase amplification circuit and the anti-phase amplification circuit comprises a gain amplification circuit and a power amplification circuit, and wherein:
[0015] a first end of the gain amplification circuit is an input end of each of the amplification circuits, a second end of the gain amplification circuit receives a first bias voltage, the first end of the gain amplification circuit is an end of the gain amplification circuit in the same direction as an amplification direction of each of the amplification circuits, and the second end of the gain amplification circuit is an end of the gain amplification circuit in the opposite direction as the amplification direction of each of the amplification circuits.
[0016] an output end of the gain amplification circuit is connected to an input end of the power amplification circuit, and an output end of the power amplification circuit is an output end of each of the amplification circuits.
[0017] Optionally, if each of the devices in the in-phase amplification circuit and the anti-phase amplification circuit adopts a power supply mode of double power supply, the first bias voltage is equal to zero.
[0018] Optionally, the gain amplification circuit is a gain operational amplification circuit, and the power amplification circuit is a complementary push-pull amplification circuit.
[0019] Optionally, each of the in-phase amplification circuit and the anti-phase amplification circuit is a power operational amplification circuit.
[0020] Another aspect of the present application provides a motor controller, comprising: an excitation modulation circuit, a processor, a resolver excitation circuit as described in any one of the previous aspects of the present application, and two feedback signal conditioning circuits; wherein:
[0021] an output end of the processor is connected to an input end of the excitation modulation circuit, an output end of the excitation modulation circuit is connected to an input end of the resolver excitation circuit;
[0022] input sides of the two feedback signal conditioning circuits are respectively connected to two output ends of a resolver feedback winding, and output sides of the two feedback signal conditioning circuits are respectively connected to two input ends of the processor.
[0023] Optionally, a filter with a cutoff frequency greater than a preset frequency is connected in series in the feedback signal conditioning circuit.
[0024] Optionally, the motor controller further comprises two differential amplification circuits, and wherein:
[0025] The output sides of the two feedback signal conditioning circuits are connected with the input sides of the two differential amplification circuits respectively, and the output sides of the two differential amplification circuits are connected with the two input ends of the processor respectively.
[0026] From the above technical solution, the utility model provides a kind of rotary variable excitation circuit, and the input end of filter circuit is as the input end of rotary variable excitation circuit;The output end of filter circuit is connected with the input end of same-phase amplification circuit, the input end of opposite-phase amplification circuit respectively;The output end of same-phase amplification circuit, the output end of opposite-phase amplification circuit are as two output ends of rotary variable excitation circuit respectively, and are connected with two receiving ends of rotary variable excitation winding respectively.Due to the rotary variable excitation circuit including same-phase amplification circuit and opposite-phase amplification circuit, so under the condition that one signal is received at the input end of the rotary variable excitation circuit, the rotary variable excitation circuit can generate differential excitation signal;And due to the input end of the rotary variable excitation circuit receiving one signal, so the rotary variable excitation circuit only needs a filter circuit to filter the signal received at its input end, so that the rotary variable excitation circuit reduces the device required by itself, and then it is favorable for the cost reduction and power density improvement of motor controller. BRIEF DESCRIPTION OF DRAWINGS
[0027] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present application, and those skilled in the art can obtain other drawings according to the provided drawings without creating labor.
[0028] Figure 1 The structural schematic diagram of one embodiment of the rotary variable excitation circuit provided by the embodiments of the present application is shown in the figure.
[0029] Figure 2 The schematic diagram of the amplitude-frequency response curve of the band-pass filter circuit provided by the embodiments of the present application is shown in the figure.
[0030] Figure 3 The structural schematic diagram of another embodiment of the rotary variable excitation circuit provided by the embodiments of the present application is shown in the figure.
[0031] Figure 4 The structural schematic diagram of one embodiment of the amplification circuit provided by the embodiments of the present application is shown in the figure.
[0032] Figure 5 And Figure 6 The structural schematic diagrams of another two embodiments of the rotary variable excitation circuit provided by the embodiments of the present application are shown in the figures.
[0033] Figure 7A structural schematic diagram of one embodiment of the motor controller provided by the embodiment of the present application;
[0034] Figure 8 and Figure 9 A structural schematic diagram of two embodiments of the feedback signal conditioning circuit 400 provided by the embodiment of the present application, respectively;
[0035] Figure 10 A structural schematic diagram of another embodiment of the motor controller provided by the embodiment of the present application. DETAILED DESCRIPTION
[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.
[0037] In the present application, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms “include”, “contain” or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement “including a…” does not exclude the presence of another identical element in the process, method, article or device including the element.
[0038] In order to reduce the devices required by the rotary transformer excitation circuit, the present application provides a rotary transformer excitation circuit, the specific structure of which is as shown in Figure 1 The rotary transformer excitation circuit specifically includes a filter circuit 10, an inverting amplification circuit 20 and a non-inverting amplification circuit 30.
[0039] The input end of the filter circuit 10 is taken as the input end of the rotary transformer excitation circuit; the output end of the filter circuit 10 is connected with the input end of the inverting amplification circuit 20 and the input end of the non-inverting amplification circuit 30, respectively; the output end of the inverting amplification circuit 20 and the output end of the non-inverting amplification circuit 30 are taken as two output ends of the rotary transformer excitation circuit, and are connected with two receiving ends of the rotary transformer excitation winding 40.
[0040] It should be noted that the passband of the filter circuit 10 is determined by actual needs; in general, the spin variable excitation circuit needs to filter out the high frequency components of the received signal, so the filter circuit 10 is usually a low-pass filter circuit, and the cutoff frequency of the low-pass filter circuit is also determined by the actual filtering needs, which is not limited here.
[0041] Since the spin variable excitation circuit includes an inverting amplifier circuit 20 and a non-inverting amplifier circuit 30, in the case that the input end of the spin variable excitation circuit receives a signal, the spin variable excitation circuit can generate a differential excitation signal and output it through its two output ends; and since the input end of the spin variable excitation circuit receives a signal, the spin variable excitation circuit only needs one filter circuit 10 to filter the signal received by its input end, thereby the spin variable excitation circuit reduces the devices required by itself, and is conducive to the cost reduction and power density improvement of the motor controller.
[0042] In related technologies, the spin variable excitation circuit is powered by a single power supply, so that the signal received by the spin variable excitation circuit needs to be superimposed on a direct current bias signal to make the spin variable excitation circuit work normally; however, if one output end of the spin variable excitation circuit is short-circuited to ground, or the spin variable excitation winding 40 is broken and soaked in water, i.e. the spin variable excitation winding 40 is short-circuited to ground through the medium of water, the direct current bias signal will increase the working current of the spin variable, thereby reducing the reliability of the spin variable.
[0043] In order to solve this problem, another embodiment of the present application provides another embodiment of the spin variable excitation circuit, which has the same specific structure as the above-mentioned embodiment, and the difference lies in that: in this embodiment, the filter circuit 10, the inverting amplifier circuit 20 and the non-inverting amplifier circuit 30 all adopt a power supply mode of double power supply, and the filter circuit 10 is a band-pass filter circuit, and the low-pass cutoff frequency of the filter circuit 10 is greater than zero.
[0044] Among them, the low-pass cutoff frequency of the filter circuit 10 refers to the one with lower frequency among the two cutoff frequencies of the filter circuit 10;
[0045] Specifically, Figure 2 The amplitude-frequency response curve of the band-pass filter circuit is f C The center frequency is f L The low-pass cutoff frequency is f H The high-pass cutoff frequency is f; the gain of f C , f L and f H and the center frequency can be determined by matching the resistance and capacitance parameters; as for how to determine it in the prior art, it is very mature, which will not be repeated here.
[0046] In addition, the low-pass cutoff frequency of the filter circuit 10 is greater than zero, which means that the filter circuit 10 can filter out the DC component in the signal received by the filter circuit 10, i.e. filter out the DC bias signal in the signal received by the filter circuit 10.
[0047] It should be noted that the two cutoff frequencies of the filter circuit 10 are determined by actual requirements and are not specifically limited here.
[0048] In actual applications, the power supply mode of double power supply is specifically that the positive power supply and the negative power supply are connected to the circuit respectively. As for how the double power supply is specifically applied to the filter circuit 10, the inverting amplifier circuit 20 and the non-inverting amplifier circuit 30, it will be described in detail below and will not be described here again.
[0049] In this embodiment, since the filter circuit 10, the inverting amplifier circuit 20 and the non-inverting amplifier circuit 30 all adopt the power supply mode of double power supply, the signal received by the filter circuit 10 can also make the rotating excitation circuit work normally without being superimposed on the DC bias signal, so that the low-pass cutoff frequency of the filter circuit 10 can be greater than zero, i.e. the filter circuit 10 can filter out the DC bias signal in the signal received by the filter circuit 10.
[0050] Since the filter circuit 10 filters out the DC bias signal in the signal received by the filter circuit 10, there is no DC bias signal in the output signal of the rotating excitation circuit, so that in the case that one output terminal of the rotating excitation circuit is short-circuited to ground or the rotating excitation winding 40 is broken and immersed in water, this embodiment reduces the degree of increase and the possibility of increasing the working current of the rotating excitation, thereby reducing the possibility of reducing the reliability of the rotating excitation.
[0051] Another embodiment of the present application provides another embodiment of the rotating excitation circuit, which has the same specific structure as the above-mentioned embodiment, and the difference lies in that in this embodiment, the filter circuit 10 is a band-pass filter circuit, and the bandwidth of the filter circuit 10 is less than a preset value.
[0052] In this embodiment, the bandwidth of the filter circuit 10 is less than a preset value, which means that the passband of the filter circuit 10 is narrow, and otherwise means that the passband of the filter circuit 10 is wide. In actual applications, the preset value is set according to actual conditions and is not specifically limited here. Generally, the preset value can be 2 kHz.
[0053] Since the narrow passband can filter out low-frequency and high-frequency alternating current signals and only retain signals of a single frequency, the filtering effect of the filter circuit 10 in this embodiment is better, thereby improving the anti-interference performance and reliability of the rotating excitation circuit.
[0054] Another embodiment of the present application provides a specific implementation of the filter circuit 10, which is applicable to the case where the filter circuit 10 is a band-pass filter circuit and the bandwidth of the filter circuit 10 is less than a preset value. The specific structure of this embodiment can be seen from Figure 3 , which specifically comprises a first operational amplifier 11, a first capacitor branch 12, a second capacitor branch 13, a first resistor branch 14, a second resistor branch 15, and a third resistor branch 16.
[0055] One end of the second resistor branch 15 serves as the input end of the filter circuit 10, and the other end of the second resistor branch 15, one end of the third resistor branch 16, one end of the first capacitor branch 12, and one end of the second capacitor branch 13 are all connected.
[0056] The other end of the third resistor branch 16 is grounded.
[0057] The other end of the first capacitor branch 12 is connected to the inverting input end of the first operational amplifier 11, and the connection point is connected to one end of the first resistor branch 14. The other end of the first resistor branch 14 is connected to the output end of the first operational amplifier 11.
[0058] The other end of the second capacitor branch 13 is connected to the output end of the first operational amplifier 11.
[0059] The non-inverting input end of the first operational amplifier 11 is grounded GND, and the output end of the first operational amplifier 11 serves as the output end of the filter circuit 10.
[0060] If the filter circuit 10 adopts a power supply mode of double power supply, as shown in Figure 3 , the negative electrode of the power supply end of the first operational amplifier 11 is connected to the negative power supply -VCC, and the positive electrode of the power supply end of the first operational amplifier 11 is connected to the positive power supply +VCC.
[0061] If the filter circuit 10 adopts a power supply mode of single power supply, the negative electrode of the power supply end of the first operational amplifier 11 is grounded GND, and the positive electrode of the power supply end of the first operational amplifier 11 is connected to the single power supply.
[0062] In the first capacitor branch 12 and the second capacitor branch 13, each capacitor branch comprises at least one capacitor. If the number of capacitors is greater than 1, all the capacitors are connected in series, and the two ends of the series branch formed thereby serve as the two ends of each capacitor branch, respectively. If the number of capacitors is equal to 1, the two ends of the capacitor serve as the two ends of each capacitor branch, respectively, such as C1 and C2 in Figure 3 .
[0063] In the first resistance branch 14, the second resistance branch 15 and the third resistance branch 16, each resistance branch comprises at least one resistance; if the number of resistances is greater than 1, all the resistances are connected in series, and the two ends of the series connection branch are respectively the two ends of each resistance branch; if the number of resistances is equal to 1, the two ends of the resistance are respectively the two ends of each resistance branch, for example, R1, R2 and R3 in Figure 3 .
[0064] The above is only one specific embodiment of the filter circuit 10, and in actual application, the filter circuit 10 includes but is not limited to the above, and the specific implementation is not limited here, and can be determined according to the specific situation, which is within the protection scope of the present application.
[0065] Another embodiment of the present application provides a first specific embodiment of the amplification circuit, which is applicable to the in-phase amplification circuit 30 and the anti-phase amplification circuit 20; the specific structure of this embodiment can be referred to Figure 4 , and specifically comprises: a gain amplification circuit 50 and a power amplification circuit 60.
[0066] The first end IN1 of the gain amplification circuit 50 is the input end of each amplification circuit, and the second end IN2 of the gain amplification circuit 50 receives the first bias voltage V0.
[0067] The first end IN1 of the gain amplification circuit 50 is the same end of the gain amplification circuit 50 as the amplification direction of each amplification circuit, and the second end IN2 of the gain amplification circuit 50 is the opposite end of the gain amplification circuit 50 as the amplification direction of each amplification circuit; for example, if the gain amplification circuit 50 is the in-phase amplification circuit 30, the first end IN1 of the gain amplification circuit 50 is the in-phase input end of the in-phase amplification circuit 30, and the second end IN2 of the gain amplification circuit 50 is the anti-phase input end of the in-phase amplification circuit 30.
[0068] The output end of the gain amplification circuit 50 is connected with the input end of the power amplification circuit 60, and the output end of the power amplification circuit 60 is the output end of each amplification circuit.
[0069] If the devices in the in-phase amplification circuit 30 and the anti-phase amplification circuit 20 all adopt the power supply mode of double power supply, the devices in the gain amplification circuit 50 and the power amplification circuit 60 all adopt the power supply mode of double power supply; if the devices in the in-phase amplification circuit 30 and the anti-phase amplification circuit 20 all adopt the power supply mode of single power supply, the devices in the gain amplification circuit 50 and the power amplification circuit 60 all adopt the power supply mode of single power supply.
[0070] If the devices in the in-phase amplification circuit 30 and the anti-phase amplification circuit 20 all adopt the power supply mode of double power supply, the first bias voltage is equal to zero, that is, the second end of the gain amplification circuit 50 is grounded GND.
[0071] If the devices in the non-inverting amplification circuit 30 and the inverting amplification circuit 20 are all powered by a single power supply, the first bias voltage V0 is not equal to zero.
[0072] In a specific example, the gain amplification circuit 50 is a gain operational amplifier circuit, and the power amplification circuit 60 is a complementary push-pull amplifier circuit.
[0073] The above example only shows one implementation of the gain amplification circuit 50 and the power amplification circuit 60, and in actual applications, including but not limited to this, no specific limitation is made here, and it can be determined according to the specific circumstances, all within the protection scope of the present application.
[0074] The present embodiment also provides a second specific implementation of the amplification circuit, which is applicable to the non-inverting amplification circuit 30 and the inverting amplification circuit 20; as shown in the figure, this implementation specifically includes: a power operational amplifier circuit 80. Figure 6
[0075] It should be noted that the specific structure of the power operational amplifier circuit 80 will be described in detail below, and will not be repeated here.
[0076] Since in the second specific implementation, the amplification circuit is a power operational amplifier circuit 80, the power at the output end is large enough, so there is no need for the power amplification circuit 60 to perform power amplification, thereby making the integration of the rotary variable excitation circuit higher.
[0077] The above are only two specific implementations of the amplification circuit, and in actual applications, including but not limited to this, no specific limitation is made here, and it can be determined according to the specific circumstances, all within the protection scope of the present application.
[0078] Another embodiment of the present application provides a specific implementation of the gain amplification circuit 50, and the specific structure can be referred to 20 or 30 in Figure 5 , which specifically includes: a second operational amplifier 51, a fourth resistance branch 52, a fifth resistance branch 53, and a sixth resistance branch 54.
[0079] The non-inverting input end of the second operational amplifier 51 is connected to one end of the fourth resistance branch 52; the connection point is connected to one end of the fifth resistance branch 53; the other end of the fifth resistance branch 53 is connected to the output end of the power amplification circuit 60.
[0080] The inverting input end of the second operational amplifier 51 is connected to one end of the sixth resistance branch 54; the output end of the second operational amplifier 51 serves as the output end of the gain amplification circuit 50.
[0081] If the gain amplification circuit 50 is powered by a dual power supply, as shown in Figure 5 As shown, the negative electrode of the power supply end of the second operational amplifier 51 is connected with the negative power supply -VCC, and the positive electrode of the power supply end of the second operational amplifier 51 is connected with the positive power supply +VCC.
[0082] If the gain amplification circuit 50 adopts the power supply mode of single power supply, the negative electrode of the power supply end of the second operational amplifier 51 is connected with the ground GND, and the positive electrode of the power supply end of the second operational amplifier 51 is connected with the single power supply.
[0083] If the gain amplification circuit 50 is in the non-inverting amplification circuit 30, as shown in the non-inverting amplification circuit 30, Figure 5 the other end of the fourth resistance branch 52 is connected with the output end of the filter circuit 10 as the first end of the gain amplification circuit 50, and receives the first bias voltage, and if the gain amplification circuit 50 adopts the power supply mode of double power supply, the other end of the fourth resistance branch 52 is connected with the ground GND; the other end of the sixth resistance branch 54 is connected with the output end of the filter circuit 10 as the second end of the gain amplification circuit 50.
[0084] If the gain amplification circuit 50 is in the inverting amplification circuit 20, as shown in the inverting amplification circuit 20, Figure 5 the other end of the fourth resistance branch 52 is connected with the output end of the filter circuit 10 as the first end of the gain amplification circuit 50; the other end of the sixth resistance branch 54 is connected with the output end of the filter circuit 10 as the second end of the gain amplification circuit 50, and receives the first bias voltage, and if the gain amplification circuit 50 adopts the power supply mode of double power supply, the other end of the sixth resistance branch 54 is connected with the ground GND.
[0085] Among them, the fourth resistance branch 52 and the fifth resistance branch 53 determine the gain of the gain amplification circuit 50, and the sixth resistance branch 54 is a matching resistance branch.
[0086] In the fourth resistance branch 52, the fifth resistance branch 53 and the sixth resistance branch 54, each resistance branch includes at least one resistance; if the number of resistances is greater than 1, all the resistances are connected in series, and the two ends of the series branch are respectively connected as the two ends of each resistance branch; if the number of resistances is equal to 1, the two ends of the resistance are respectively connected as the two ends of each resistance branch, for example, Figure 3 R4, R5 and R6 in the above.
[0087] The above is only one specific embodiment of the gain amplification circuit 50, and in actual application, it includes but is not limited to this, which is not specifically limited here, and can be determined according to the specific situation, and is within the protection scope of the present application.
[0088] Another embodiment of the present application provides one specific embodiment of the power amplification circuit 60, and the specific structure can be referred to Figure 5The 20 or 30 in the circuit specifically includes: a first switch tube 61, a second switch tube 62, a first diode branch 63, a second diode branch 64, a seventh resistance branch 65, an eighth resistance branch 66, a ninth resistance branch 67, a tenth resistance branch 68, an eleventh resistance branch 69, and a twelfth resistance branch 70.
[0089] The input end of the power amplifier circuit 60 is connected with the cathode of the first diode branch 63; the anode of the first diode branch 63 is connected with one end of the seventh resistance branch 65; the other end of the seventh resistance branch 65 is connected with one end of the eighth resistance branch 66, and the connection point is connected with the control end of the first switch tube 61; the other end of the eighth resistance branch 66 is connected with the input end of the first switch tube 61; the output end of the first switch tube 61 is connected with one end of the ninth resistance branch 67; the other end of the ninth resistance branch 67 is connected with the output end of the power amplifier circuit 60.
[0090] The input end of the power amplifier circuit 60 is connected with the anode of the second diode branch 64; the cathode of the second diode branch 64 is connected with one end of the tenth resistance branch 68; the other end of the tenth resistance branch 68 is connected with one end of the eleventh resistance branch 69, and the connection point is connected with the control end of the second switch tube 62; the other end of the eleventh resistance branch 69 is connected with the output end of the second switch tube 62; the input end of the second switch tube 62 is connected with one end of the twelfth resistance branch 70; the other end of the twelfth resistance branch 70 is connected with the output end of the power amplifier circuit 60.
[0091] If the power amplifier circuit 60 adopts a power supply mode of double power supply, the connection point of the eighth resistance branch 66 and the first switch tube 61 is connected with the positive power supply +VCC, and the connection point of the eleventh resistance branch 69 and the second switch tube 62 is connected with the negative power supply -VCC.
[0092] If the power amplifier circuit 60 adopts a power supply mode of single power supply, the connection point of the eighth resistance branch 66 and the first switch tube 61 is connected with the ground GND, and the connection point of the eleventh resistance branch 69 and the second switch tube 62 is connected with the single power supply.
[0093] In this embodiment, the power amplification circuit 60 is a complementary push-pull amplification circuit; wherein the first switch tube 61 and the second switch tube 62 are at least one of which is conducting at any time; the ninth resistance branch 67 and the twelfth resistance branch 70 are used for current limiting of the output of the power amplification circuit 60; the eighth resistance branch 66, the seventh resistance branch 65, the tenth resistance branch 68, the eleventh resistance branch 69, the first diode branch 63 and the second diode branch 64 are used for configuring the static working point of the power amplification circuit 60 to prevent crossover distortion; the eighth resistance branch 66 and the eleventh resistance branch 69 are also used for voltage division and current limiting; the first diode branch 63 and the second diode branch 64 have a clamping effect, so that the switch tube corresponding to itself is in a micro-conducting state; the seventh resistance branch 65 and the tenth resistance branch 68 are also used for adjusting the static working point of the power amplification circuit 60.
[0094] In the seventh resistance branch 65, the eighth resistance branch 66, the ninth resistance branch 67, the tenth resistance branch 68, the eleventh resistance branch 69 and the twelfth resistance branch 70, each resistance branch includes at least one resistance; if the number of resistances is greater than 1, all the resistances are connected in series, and the two ends of the series branch are respectively used as the two ends of each resistance branch; if the number of resistances is equal to 1, the two ends of the resistance are respectively used as the two ends of each resistance branch, for example, R6, R7, R8, R9, R10, R11 and R12 in Figure 5 .
[0095] In the first diode branch 63 and the second diode branch 64, each diode branch includes at least one diode; if the number of diodes is greater than 1, all the diodes are connected in series in the same direction, the anode of the series branch is used as the anode of each diode branch, and the cathode of the series branch is used as the cathode of each diode branch; if the number of diodes is equal to 1, the anode of the diode is used as the anode of each diode branch, and the cathode of the diode is used as the cathode of each diode branch; for example, Z1 and Z2 in Figure 5 .
[0096] Optionally, each switch tube can be a MOS tube or a triode, for example, Q1 and Q2 in Figure 5 . In actual application, the above-mentioned embodiments are included but not limited thereto, which are not specifically limited here and can be determined according to specific conditions, and are all within the protection scope of the present application.
[0097] The above-mentioned is only one specific embodiment of the power amplification circuit 60, and in actual application, the above-mentioned embodiments are included but not limited thereto, which are not specifically limited here and can be determined according to specific conditions, and are all within the protection scope of the present application.
[0098] Another embodiment of the present application provides a specific embodiment of a power amplification circuit 80, and the specific structure can be referred toFigure 6 The power operational amplifier 81, the thirteenth resistance branch 82, the fourteenth resistance branch 83, and the fifteenth resistance branch 84.
[0099] The non-inverting input of the power operational amplifier 81 is connected to one end of the thirteenth resistance branch 82, and the connection point is connected to one end of the fourteenth resistance branch 83; the other end of the fourteenth resistance branch 83 is connected to the output of the power operational amplifier 81.
[0100] The inverting input of the power operational amplifier 81 is connected to one end of the fifteenth resistance branch 84.
[0101] The output of the power operational amplifier 81 is the output of the power operational amplifier circuit 80.
[0102] If the power operational amplifier circuit 80 adopts the power supply mode of double power supply, as shown in Figure 6 , the negative electrode of the power supply end of the power operational amplifier 81 is connected to the negative power supply -VCC, and the positive electrode of the power supply end of the power operational amplifier 81 is connected to the positive power supply +VCC.
[0103] If the power operational amplifier circuit 80 adopts the power supply mode of single power supply, the negative electrode of the power supply end of the power operational amplifier 81 is connected to the ground GND, and the positive electrode of the power supply end of the power operational amplifier 81 is connected to the single power supply.
[0104] If the power operational amplifier circuit 80 is in the non-inverting amplification circuit 30, as shown in Figure 6 , the other end of the thirteenth resistance branch 82 receives the first bias voltage, and if the power operational amplifier circuit 80 adopts the power supply mode of double power supply, the other end of the thirteenth resistance branch 82 is connected to the ground GND; the other end of the fifteenth resistance branch 84 is connected to the output of the filter circuit 10.
[0105] If the power operational amplifier circuit 80 is in the inverting amplification circuit 20, as shown in Figure 6 , the other end of the thirteenth resistance branch 82 is connected to the output of the filter circuit 10; the other end of the fifteenth resistance branch 84 receives the first bias voltage, and if the power operational amplifier circuit 80 adopts the power supply mode of double power supply, the other end of the fifteenth resistance branch 84 is connected to the ground GND.
[0106] In the thirteenth resistance branch 82, the fourteenth resistance branch 83, and the fifteenth resistance branch 84, each resistance branch includes at least one resistance; if the number of resistances is greater than 1, all the resistances are connected in series, and the two ends of the series branch are respectively the two ends of each resistance branch; if the number of resistances is equal to 1, the two ends of the resistance are respectively the two ends of each resistance branch, for example, R13, R14, and R15 in Figure 6 .
[0107] It should be noted that the working principle of this embodiment of the power operational amplifier circuit 80 is very mature in the prior art, and will not be described here.
[0108] The above is only one specific embodiment of the power operational amplifier circuit 80, and in actual application, it includes but is not limited to this, and is not specifically limited here, and can be determined according to the specific situation, and is within the protection scope of the present application.
[0109] Another embodiment of the present application provides a motor controller, and the specific structure can be seen from Figure 7 , and specifically includes a processor 100, an excitation modulation circuit 200, a resolver excitation circuit 300 provided by the above embodiment, and two feedback signal conditioning circuits 400.
[0110] The output end of the processor 100 is connected with the input end of the excitation modulation circuit 200, and the output end of the excitation modulation circuit 200 is connected with the input end of the resolver excitation circuit 300; the input side of the two feedback signal conditioning circuits 400 is respectively connected with the two output ends of the resolver feedback winding 500, and the output side of the two feedback signal conditioning circuits 400 is respectively connected with the two input ends of the processor 100.
[0111] In actual application, one feedback signal conditioning circuit 400 is a sin signal feedback conditioning circuit, and the other feedback signal conditioning circuit 400 is a cos signal feedback conditioning circuit.
[0112] It should be noted that the resolver excitation circuit 300 has been described in detail in the above embodiment, and will not be described here; in addition, the excitation modulation circuit 200 is very mature in the prior art, and will not be described in detail here.
[0113] Another embodiment of the present application provides an embodiment of the feedback signal conditioning circuit 400, which is suitable for the two feedback signal conditioning circuits 400; the specific structure of this embodiment can be seen from Figure 8 , and specifically includes a common-mode inductor 511, a first anti-surge diode branch 512, a second anti-surge diode branch 513, a sixteenth resistance branch 514, a seventeenth resistance branch 515, an eighteenth resistance branch 516, a nineteenth resistance branch 517, a twentieth resistance branch 518, a twenty-first resistance branch 519, a twenty-second resistance branch 520, a third capacitor branch 521, a fourth capacitor branch 522, a fifth capacitor branch 523, a sixth capacitor branch 524, a seventh capacitor branch 525, and an eighth capacitor branch 526.
[0114] The cathode of the first anti-surge diode branch 512 is connected to one end of the first side winding of the common-mode inductor 511, and the connection point serves as one end of the input side of the feedback signal conditioning circuit 400; the anode of the first anti-surge diode branch 512 is connected to the anode of the second anti-surge diode branch 513, and the connection point is grounded GND; the cathode of the second anti-surge diode branch 513 is connected to one end of the second side winding of the common-mode inductor 511, and the connection point serves as the other end of the input side of the feedback signal conditioning circuit 400.
[0115] The other end of the first side winding of the common-mode inductor 511 is connected to one end of the sixteenth resistance branch 514; the other end of the second side winding of the common-mode inductor 511 is connected to one end of the seventeenth resistance branch 515; the other end of the sixteenth resistance branch 514 is connected to one end of the third capacitance branch 521, and the connection point is connected to one end of the eighteenth resistance branch 516; the other end of the seventeenth resistance branch 515 is connected to the other end of the third capacitance branch 521, and the connection point is connected to one end of the nineteenth resistance branch 517; the fourth capacitance branch 522 and the fifth capacitance branch 523 are connected in series, and the series connection branch is connected in parallel with the third capacitance branch 521; the connection point of the fourth capacitance branch 522 and the fifth capacitance branch 523 is grounded GND.
[0116] The other end of the eighteenth resistance branch 516 is connected to one end of the sixth capacitance branch 524, and the connection point serves as one end of the output side of the feedback signal conditioning circuit 400; the other end of the nineteenth resistance branch 517 is connected to the other end of the sixth capacitance branch 524, and the connection point serves as the other end of the output side of the feedback signal conditioning circuit 400.
[0117] The seventh capacitance branch 525 and the eighth capacitance branch 526 are connected in series, and the series connection branch is connected in parallel with the sixth capacitance branch 524; the connection point of the seventh capacitance branch 525 and the eighth capacitance branch 526 is grounded GND; the twentieth resistance branch 518 is connected in parallel with the sixth capacitance branch 524; the twenty-first resistance branch 519 and the twenty-second resistance branch 520 are connected in series, and the series connection branch is connected in parallel with the sixth capacitance branch 524; the connection point of the twenty-first resistance branch 519 and the twenty-second resistance branch 520 receives the second bias voltage V1.
[0118] In the first anti-surge diode branch 512 and the second anti-surge diode branch 513, each anti-surge diode branch includes at least one anti-surge diode; if the number of anti-surge diodes is greater than 1, all the anti-surge diodes are connected in series in the same direction, the anode of the formed series branch is used as the anode of each anti-surge diode branch, and the cathode of the formed series branch is used as the cathode of each anti-surge diode branch; if the number of anti-surge diodes is equal to 1, the anode of the anti-surge diode is used as the anode of each anti-surge diode branch, and the cathode of the anti-surge diode is used as the cathode of each anti-surge diode branch; for example, as T1 and T2 in Figure 8 . .
[0119] In the sixteenth resistance branch 514, the seventeenth resistance branch 515, the eighteenth resistance branch 516, the nineteenth resistance branch 517, the twentieth resistance branch 518, the twenty-first resistance branch 519, and the twenty-second resistance branch 520, each resistance branch includes at least one resistance; if the number of resistances is greater than 1, all the resistances are connected in series, and the two ends of the formed series branch are used as the two ends of each resistance branch; if the number of resistances is equal to 1, the two ends of the resistance are used as the two ends of each resistance branch, for example, as R16, R17, R18, R19, R20, R21, and R22 in Figure 8 . .
[0120] In the third capacitor branch 521, the fourth capacitor branch 522, the fifth capacitor branch 523, the sixth capacitor branch 524, the seventh capacitor branch 525, and the eighth capacitor branch 526, each capacitor branch includes at least one capacitor; if the number of capacitors is greater than 1, all the capacitors are connected in series, and the two ends of the formed series branch are used as the two ends of each capacitor branch; if the number of capacitors is equal to 1, the two ends of the capacitor are used as the two ends of each capacitor branch, for example, as C3, C4, C5, C6, C7, and C8 in Figure 8 . .
[0121] The first anti-surge diode 512 and the second anti-surge diode 513 are used for ESD (Electro-Static discharge) protection; the common mode inductor 511 is used for filtering common mode interference noise; the sixteenth resistance branch 514, the seventeenth resistance branch 515, the eighteenth resistance branch 516, the nineteenth resistance branch 517, the third capacitance branch 521, the fourth capacitance branch 522, the fifth capacitance branch 523, the sixth capacitance branch 524, the seventh capacitance branch 525 and the eighth capacitance branch 526 form a resistance-capacitance filter network; the third capacitance branch 521 and the sixth capacitance branch 524 are X capacitors, which are used for filtering differential mode interference noise; the fourth capacitance branch 522, the fifth capacitance branch 523, the seventh capacitance branch 525 and the eighth capacitance branch 526 are Y capacitors, which are used for filtering common mode interference noise.
[0122] In addition, the second bias voltage V1, the twenty-first resistance branch 519 and the twenty-second resistance branch 520 are used for providing DC bias, so that the subsequent circuit can normally process the signal output by the feedback signal conditioning circuit 400; at this time, the processor 100 can normally process the signal output by the feedback signal conditioning circuit 400.
[0123] Another embodiment of the present application also provides another embodiment of the feedback signal conditioning circuit 400, which is applicable to two feedback signal conditioning circuits 400; the specific structure of this embodiment can be referred to Figure 9 , and this embodiment further includes a ninth capacitance branch 527 and a tenth capacitance branch 528 on the basis of the above-mentioned embodiment.
[0124] One end of the ninth capacitance branch 527 is connected to the connection point of the eighteenth resistance branch 516 and the sixth capacitance branch 524, and the other end of the ninth capacitance branch 527 is used as one end of the output side of the feedback signal conditioning circuit 400; one end of the tenth capacitance branch 528 is connected to the connection point of the nineteenth resistance branch 517 and the sixth capacitance branch 524, and the other end of the tenth capacitance branch 528 is used as one end of the output side of the feedback signal conditioning circuit 400.
[0125] The ninth capacitance branch 527, the tenth capacitance branch 528 and the twentieth resistance branch 518 form a filter with a cutoff frequency greater than a preset frequency; when the resolver feedback winding 500 has low-frequency coupling noise from a motor or other equipment, this filter is used to isolate the low-frequency interference noise signal, so as to improve the anti-interference ability of the resolver.
[0126] The filter with the cut-off frequency greater than the preset frequency refers to a filter with a greater cut-off frequency, i.e., a high-pass filter; in actual application, the preset frequency can be set according to actual conditions, which is not specifically limited here. Generally, the preset frequency can be 5 kHz.
[0127] In the ninth and tenth capacitor branches 527 and 528, each capacitor branch includes at least one capacitor; if the number of capacitors is greater than 1, all the capacitors are connected in series, and the two ends of the series branch are respectively used as the two ends of each capacitor branch; if the number of capacitors is equal to 1, the two ends of the capacitor are respectively used as the two ends of each capacitor branch, for example, C9 and C10 in Figure 9
[0128] The above are only two embodiments of the feedback signal conditioning circuit 400, and in actual application, the embodiments are not limited to the above, which are not specifically limited here and can be determined according to actual conditions, and all are within the protection scope of the present application.
[0129] Another embodiment of the present application provides another embodiment of the motor controller, and the specific structure can be referred to Figure 10 , which is based on the above-mentioned embodiments and further includes two differential amplification circuits 600.
[0130] The output sides of the two feedback signal conditioning circuits 400 are respectively connected to the input sides of the two differential amplification circuits 600, and the output sides of the two differential amplification circuits 600 are respectively connected to the two input ends of the processor 100.
[0131] The differential amplification circuit 600 is used to convert the differential signal into a single-ended signal for processing by the processor 100.
[0132] It should be noted that the differential amplification circuit 600 is very mature in the prior art, and will not be described here.
[0133] The above description of the disclosed embodiments, the features described in each embodiment in the specification can be replaced or combined with each other, so that those skilled in the art can realize or use the present application. The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with the preferred embodiment, it is not intended to limit the present application. Any person skilled in the art, without departing from the technical solution of the present application, can make many possible changes and modifications to the technical solution of the present application by using the above disclosed methods and technical contents, or modify it into equivalent embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the technical solution of the present application, all still belong to the protection scope of the technical solution of the present application.
Claims
1. A rotary transducer excitation circuit, characterized by The application relates to a rotating variable excitation circuit, which comprises a filter circuit, a same-phase amplification circuit and an opposite-phase amplification circuit; wherein: the input end of the filter circuit is used as the input end of the rotating variable excitation circuit; the output end of the filter circuit is connected with the input end of the same-phase amplification circuit and the input end of the opposite-phase amplification circuit respectively; the output end of the same-phase amplification circuit and the output end of the opposite-phase amplification circuit are used as two output ends of the rotating variable excitation circuit and are connected with two receiving ends of a rotating variable excitation winding. The filter circuit, the same-phase amplification circuit and the opposite-phase amplification circuit all adopt a double-power-supply power supply mode. The filter circuit comprises a band-pass filter circuit, and the low-pass cutoff frequency of the band-pass filter circuit is greater than zero. The filter circuit comprises a band-pass filter circuit, and the bandwidth of the band-pass filter circuit is less than a preset value. In the same-phase amplification circuit and the opposite-phase amplification circuit, each amplification circuit comprises a gain amplification circuit and a power amplification circuit; wherein: the first end of the gain amplification circuit is used as the input end of each amplification circuit, and the second end of the gain amplification circuit receives a first bias voltage; the first end of the gain amplification circuit is the same end as the amplification direction of each amplification circuit on the gain amplification circuit; the second end of the gain amplification circuit is the opposite end as the amplification direction of each amplification circuit on the gain amplification circuit; the output end of the gain amplification circuit is connected with the input end of the power amplification circuit, and the output end of the power amplification circuit is used as the output end of each amplification circuit.
2. The rotary union energizing circuit of claim 1, wherein, If the devices in the same-phase amplification circuit and the opposite-phase amplification circuit all adopt the double-power-supply power supply mode, the first bias voltage is equal to zero. The gain amplification circuit is a gain operational amplification circuit, and the power amplification circuit is a complementary push-pull amplification circuit.
3. The rotary union energizing circuit of claim 1, wherein, In the same-phase amplification circuit and the opposite-phase amplification circuit, each amplification circuit is a power operational amplification circuit.
4. A rotary transducer excitation circuit according to any one of claims 1 to 3, characterised in that, The application further relates to a rotating variable excitation system, which comprises an excitation modulation circuit, a processor, the rotating variable excitation circuit and two feedback signal conditioning circuits; wherein: the output end of the processor is connected with the input end of the excitation modulation circuit, the output end of the excitation modulation circuit is connected with the input end of the rotating variable excitation circuit, the input sides of the two feedback signal conditioning circuits are connected with two output ends of a rotating variable feedback winding respectively, and the output sides of the two feedback signal conditioning circuits are connected with two input ends of the processor respectively. A filter with a cutoff frequency greater than a preset frequency is connected in series in the feedback signal conditioning circuit. The application further relates to a rotating variable excitation system, which comprises two differential amplification circuits; wherein: the output sides of the two feedback signal conditioning circuits are connected with the input sides of the two differential amplification circuits respectively, and the output sides of the two differential amplification circuits are connected with two input ends of the processor respectively.
5. The rotary union energizing circuit of claim 4, wherein, 6. The rotary union energizing circuit of claim 4, wherein, 7. The rotary transducer excitation circuit according to any one of claims 1 to 3, characterized in that 8. An electric machine controller characterized by 9. The motor controller of claim 8, wherein, 10. An electric machine controller according to claim 8 or 9, characterized in that,