Signal transmission device of rotary transformer

Abstract

The utility model provides a signal transmission device for a rotary transformer, which relates to the technical field of electronic circuits and comprises a VC signal transmission module, a VS signal transmission module, an SPI voltage compensation module and a first power module. The VC signal transmission module comprises a power amplifier module I and a transformer module I, and the VS signal transmission module comprises a power amplifier module II and a transformer module II; the SPI voltage compensation module is respectively connected with the VC signal transmission module and the VS signal transmission module, and the SPI voltage compensation module comprises a power supply module 2, and an SPI isolation module, a DAC module and a power amplifier module 3 which are connected in sequence. The beneficial effects of the utility model are that the isolation voltage between a rotary transformer test device and a rotary transformer signal is effectively increased, and the device is prevented from being burnt down; the bias voltage of the output resolver signal is modified according to actual requirements, and the problem of ground bias of the resolver signal is effectively solved; and the method has a good response characteristic to the signal frequency band of the rotary transformer.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, in particular to a rotary transformer signal transmission device. Background Art

[0002] A resolver, also known as a synchronous resolver, is an electromagnetic sensor used to measure the shaft angle and angular velocity of a rotating object. It consists of a stator and a rotor. The stator winding, serving as the resolver's primary, receives the excitation signal from an external circuit. The rotor, serving as the transformer's secondary, generates an induced electromotive force through electromagnetic coupling, producing an induced voltage. Due to its unique structure, resolvers offer shock resistance, high temperature resistance, oil resistance, high reliability, and long lifespan. They are currently widely used for angle and speed measurement. However, because the output signal is modulated, the transmission and resolution processes are complex. Furthermore, since resolver signals typically use the power battery ground as a reference ground, while detection equipment typically uses the device ground or the negative power supply as a reference ground, a voltage difference often exists when the devices are connected. This voltage difference can often cause the resolver signal to deviate from the detection range, leading to detection failure.

[0003] How to solve the above technical problems is the subject faced by this utility model. Utility Model Content

[0004] In order to address the deficiencies of the prior art, the utility model provides a resolver signal transmission device that effectively increases the isolation voltage between resolver test equipment and resolver signals, prevents equipment burnout, modifies the bias voltage of the output resolver signal according to actual needs, effectively solves the problem of resolver signal bias to ground, and has good response characteristics to the resolver signal frequency band.

[0005] The technical solution adopted by the present invention to solve its technical problems is: the present invention provides a rotating transformer signal transmission device, including a VC signal transmission module, a VS signal transmission module, an SPI voltage compensation module and a power supply module 1; the VC signal transmission module includes a power amplifier module 1 and a transformer module 1, and the VS signal transmission module includes a power amplifier module 2 and a transformer module 2; the SPI voltage compensation module is respectively connected to the VC signal transmission module and the VS signal transmission module, and is used to compensate for the bias voltage required by the VC signal transmission module and the VS signal transmission module; the SPI voltage compensation module includes a power supply module 2 and an SPI isolation module, a DAC module, and a power amplifier module 3 connected in sequence.

[0006] Preferably, the power amplifier module 1 includes two groups of identical power amplifier circuits, each group of power amplifier circuits is connected to a VC signal; the power amplifier module 2 also includes the two groups of identical power amplifier circuits, each group of power amplifier circuits is connected to a VS signal.

[0007] After the two VC and two VS signals are input into the VC signal transmission module and the VS signal transmission module, the driving power of the two VC and VS signals is increased respectively by the power amplifier module 1 and the power amplifier module 2. Then, after coupling through the transformer module 1 and the transformer module 2, analog signals with the same amplitude and frequency as the VC and VS input signals are obtained, thereby realizing electrical isolation between the VC and VS input signals and the output signals.

[0008] Preferably, the power supply module 1 is connected to the power amplifier module 1, the power amplifier module 2 and the front end of the SPI isolation module; the power supply module 2 is connected to the back end of the SPI isolation module, the DAC module and the power amplifier module 3.

[0009] The power supply module 1 supplies power to the power amplifier module 1, the power amplifier module 2 and the front end of the SPI isolation module; the power supply module 2 supplies power to the back end of the SPI isolation module, the DAC module and the power amplifier module 3.

[0010] Preferably, the power module 1 and the power module 2 both include a power circuit and a power chip circuit.

[0011] Preferably, the SPI isolation module isolates the SPI bus signal and controls the two input signals VREFA and VREFB;

[0012] The power amplifier module three includes the two groups of identical power amplifier circuits, which are respectively connected to the VREFA signal and the VREFB signal.

[0013] Preferably, the VREFA and VREFB signals are first converted from digital quantities to analog quantities through the DAC module, and then output two analog voltage signals REFA_I SO and REFB_I SO through the power amplifier module three, which are respectively connected to the transformer module one and the transformer module two to compensate for the bias voltage required by the VC signal transmission module and the VS signal transmission module, thereby eliminating the voltage difference between the detection devices.

[0014] Preferably, the transformer module 1 and the transformer module 2 use transformers with center taps.

[0015] Preferably, the two analog voltage signals REFA_I SO and REFB_I SO output by the power amplifier module three are connected to the center taps of the transformers in the transformer module one and the transformer module two respectively.

[0016] The beneficial effects of the present invention are as follows: after the VC signal and the VS signal are input into the device, an analog signal with the same amplitude and frequency as the VC and VS input signals is obtained through processing by the transformer module 1 of the VC signal transmission module and the transformer module 2 of the VS signal transmission module, thereby realizing lossless transmission of the VC and VS input signals and output signals, and having good response characteristics to the frequency band of the resolver signal; the SPI compensation module is connected to the transformer module 1 and the transformer module 2 of the VC signal transmission module and the VS signal transmission module to compensate for the bias voltage required by the VC signal transmission module and the VS signal transmission module, effectively increasing the isolation voltage between the resolver test equipment and the resolver signal, and preventing the equipment from burning; at the same time, the bias voltage of the output resolver signal can be modified according to actual needs, effectively solving the problem of the resolver signal being biased to the ground. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the overall electrical connection schematic diagram of the utility model;

[0018] Figure 2 This is a set of power amplifier circuit diagrams for the power amplifier module 1 in the VC signal transmission module of the present utility model;

[0019] Figure 3 This is a circuit diagram of the transformer module 1 in the VC signal transmission module of the present utility model;

[0020] Figure 4 This is the overall circuit diagram of the VC / VS signal transmission module of the utility model;

[0021] Figure 5 This is a circuit diagram of the SPI isolation module of the utility model;

[0022] Figure 6 This is a circuit diagram of the DAC module of the utility model;

[0023] Figure 7 This is the power amplifier circuit diagram of the three VREFA signals of the power amplifier module of the utility model;

[0024] Figure 8 This is the power chip circuit of the power module 1 / power module 2 of the utility model;

[0025] Figure 9 This is the power circuit diagram of the power module 1 / power module 2 of the utility model. DETAILED DESCRIPTION

[0026] In order to clearly illustrate the technical features of this solution, the solution is described below through specific implementation methods.

[0027] Example 1:

[0028] See also Figures 1 to 9 As shown, this embodiment is a rotary transformer signal transmission device, including a VC signal transmission module, a VS signal transmission module, an SPI voltage compensation module and a power supply module.

[0029] The VC signal transmission module includes power amplifier module 1 and transformer module 1. Power amplifier module 1 includes two identical power amplifier circuits, each connected to a single VC signal. After the two VC signals are input, they are first boosted by power amplifier module 1. After coupling through transformer module 1, the resulting analog signal has the same amplitude and frequency as the VC input signal, achieving electrical isolation between the VC input and output signals.

[0030] The VS signal transmission module includes power amplifier module 2 and transformer module 2. Power amplifier module 2 also includes the two identical power amplifier circuits described above, each connected to a single VS signal. After the two VS signals are input, they are first amplified by power amplifier module 2, and then coupled through transformer module 2 to produce an analog signal with the same amplitude and frequency as the VS input signal, thereby achieving electrical isolation between the VS input and output signals.

[0031] The SPI voltage compensation module is connected to the VC signal transmission module and the VS signal transmission module respectively, and is used to compensate for the bias voltage required by the VC signal transmission module and the VS signal transmission module; the SPI voltage compensation module includes a power supply module 2 and an SPI isolation module, a DAC module, and a power amplifier module 3 connected in sequence.

[0032] The SPI isolation module is used to achieve electrical isolation of the digital control terminal SPI signal and control the two input signals VREFA and VREFB. The power amplifier module three includes the two identical power amplifier circuits, which are connected to the VREFA signal and the VREFB signal respectively.

[0033] The VREFA and VREFB signals are first converted from digital to analog through the DAC module, and then output two analog voltage signals REFA_ISO and REFB_ISO through the power amplifier module three. They are connected to the transformer module one and the transformer module two respectively to compensate for the bias voltage required by the VC signal transmission module and the VS signal transmission module, eliminating the voltage difference between the detection equipment.

[0034] Both power module 1 and power module 2 include power circuits and power chip circuits. Power module 1 supplies power to power amplifier module 1, power amplifier module 2 and the front end of the SPI isolation module. Power module 2 supplies power to the back end of the SPI isolation module, the DAC module and power amplifier module 3.

[0035] Example 2:

[0036] See also Figure 1 、 Figure 2 As shown, this embodiment is a rotating transformer signal transmission device, including a VC signal transmission module, a VS signal transmission module, an SPI voltage compensation module and a power supply module 1. The SPI voltage compensation module is respectively connected to the VC signal transmission module and the VS signal transmission module. The SPI voltage compensation module includes a power supply module 2 and an SPI isolation module, a DAC module, and a power amplifier module 3 connected in sequence.

[0037] The VC signal transmission module includes power amplifier module 1 and transformer module 1. Power amplifier module 1 includes two identical power amplifier circuits, each connected to a single VC signal. After the two VC signals are input, they are first boosted by power amplifier module 1. After coupling through transformer module 1, the resulting analog signal has the same amplitude and frequency as the VC input signal, achieving electrical isolation between the VC input and output signals.

[0038] The VS signal transmission module includes power amplifier module 2 and transformer module 2. Power amplifier module 2 also includes the two identical power amplifier circuits described above, each connected to a single VS signal. After the two VS signals are input, they are first amplified by power amplifier module 2, and then coupled through transformer module 2 to produce an analog signal with the same amplitude and frequency as the VS input signal, thereby achieving electrical isolation between the VS input and output signals.

[0039] Example 3:

[0040] See also Figures 1 to 7 This embodiment provides a rotary transformer signal transmission device, including a VC signal transmission module, a VS signal transmission module, an SPI voltage compensation module, and a first power supply module. The VC signal transmission module includes a first power amplifier module and a first transformer module, while the VS signal transmission module includes a second power amplifier module and a second transformer module.

[0041] The SPI voltage compensation module includes a power supply module 2 and an SPI isolation module, a DAC module, and a power amplifier module 3 which are connected in sequence.

[0042] The SPI isolation module is used to achieve electrical isolation of the digital control terminal SPI signal and control the two input signals VREFA and VREFB. The power amplifier module three includes the two identical power amplifier circuits, which are connected to the VREFA signal and the VREFB signal respectively.

[0043] The VREFA and VREFB signals are first converted from digital to analog through the DAC module, and then output two analog voltage signals REFA_ISO and REFB_ISO through the power amplifier module three. They are connected to the transformer module one and the transformer module two respectively to compensate for the bias voltage required by the VC signal transmission module and the VS signal transmission module, eliminating the voltage difference between the detection equipment.

[0044] The technical features not described in the present invention can be realized by or by adopting the existing technology, and will not be described in detail here. Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A rotary transformer signal transmission device, characterized in that: It includes a VC signal transmission module, a VS signal transmission module, an SPI voltage compensation module and a power supply module 1; the VC signal transmission module includes a power amplifier module 1 and a transformer module 1, and the VS signal transmission module includes a power amplifier module 2 and a transformer module 2; the SPI voltage compensation module is respectively connected to the VC signal transmission module and the VS signal transmission module, and the SPI voltage compensation module includes a power supply module 2 and an SPI isolation module, a DAC module, and a power amplifier module 3 connected in sequence.

2. The rotary transformer signal transmission device according to claim 1, characterized in that: The power amplifier module 1 includes two groups of identical power amplifier circuits, and each group of power amplifier circuits is connected to a VC signal; the power amplifier module 2 also includes the two groups of identical power amplifier circuits, and each group of power amplifier circuits is connected to a VS signal.

3. The rotary transformer signal transmission device according to claim 1, characterized in that: The power supply module 1 is connected to the power amplifier module 1, the power amplifier module 2 and the front end of the SPI isolation module; the power supply module 2 is connected to the back end of the SPI isolation module, the DAC module and the power amplifier module 3.

4. The rotary transformer signal transmission device according to claim 1, characterized in that: The power module 1 and the power module 2 both include a power circuit and a power chip circuit.

5. The rotary transformer signal transmission device according to claim 1, characterized in that: The SPI isolation module isolates the SPI bus signal and controls the two input signals VREFA and VREFB; The power amplifier module three includes the two groups of identical power amplifier circuits, which are respectively connected to the VREFA signal and the VREFB signal.

6. The rotary transformer signal transmission device according to claim 5, characterized in that: The VREFA and VREFB signals are first converted from digital quantities to analog quantities through the DAC module, and then output two analog voltage signals REFA_ISO and REFB_ISO through the power amplifier module three, which are connected to the transformer module one and the transformer module two respectively.

7. The rotary transformer signal transmission device according to claim 1, characterized in that: The transformer module 1 and the transformer module 2 use transformers with center taps.

8. The rotary transformer signal transmission device according to claim 6, characterized in that: The two analog voltage signals REFA_ISO and REFB_ISO output by the power amplifier module 3 are connected to the center taps of the transformers in the transformer module 1 and the transformer module 2 respectively.

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