Device for exciting a resolver, and resolver arrangement
AssigneeRobert Bosch GmbH
InventorTim Bruckhaus
Life of this patent
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Abstract
The present invention relates to providing an electrical voltage for exciting an excitation coil of a resolver (2). In this case, the electrical voltage for exciting the excitation coil of the resolver (2) can be generated by means of pulse-width-modulated driving of at least one half-bridge (H1). In this case, the switching elements of the half-bridge (H1) are fully turned on, with the result that losses such as occur during linear operation of semiconductor switches, for example, can be avoided. If appropriate, the voltage (U_e) provided by the half-bridge (H1) can be additionally increased by means of suitable resonant circuits (L1, C1, C3 . . . ).
Claims11
A device (1) for exciting a resolver (2):
- a first output connection (A1) configured to be coupled to a first excitation connection of the resolver (2),
- a second output connection (A2) configured to be coupled to a second excitation connection of the resolver (2),
- a first half-bridge (H1) having a first switching element (T1), which is arranged between a supply voltage and a first node (K1), and a second switching element (T2), which is arranged between the first node (K1) and a reference-ground potential, the first node (K1) being coupled to the first output connection (A1),
- a second half-bridge (H2) having a third switching element (T3), which is arranged between the supply voltage and a second node (K2), and a fourth switching element (T4), which is arranged between the second node (K2) and the reference-ground potential, the second node (K2) being coupled to the second output connection (A2), and
- a control apparatus (10) configured to control the first switching element (T1), the second switching element (T2), the third switching element (T3), and the fourth switching element (T4),
- wherein the control apparatus (10) is configured to provide a pulse-width-modulated control signal at each of the control inputs of the switching elements (T1 to T4), and
- wherein a frequency of the pulse-width-modulated control signal is at least ten times more than that of a fundamental frequency of an excitation voltage provided to the resolver (2).
A resolver arrangement, having:
- a resolver (2), comprising a field coil (E) having a first excitation connection and a second excitation connection;
- and
- a device (1) for exciting the resolver (2) including
- a first output connection (A1) configured to be coupled to a first excitation connection of the resolver (2),
- a second output connection (A2) configured to be coupled to a second excitation connection of the resolver (2),
- a first half-bridge (H1) having a first switching element (T1), which is arranged between a supply voltage and a first node (K1), and a second switching element (T2), which is arranged between the first node (K1) and a reference-ground potential, the first node (K1) being coupled to the first output connection (A1),
- a second half-bridge (H2) having a third switching element (T3), which is arranged between the supply voltage and a second node (K2), and a fourth switching element (T4), which is arranged between the second node (K2) and the reference-ground potential, the second node (K2) being coupled to the second output connection (A2), and
- a control apparatus (10) configured to control the first switching element (T1), the second switching element (T2), the third switching element (T3), and the fourth switching element (T4),
- wherein the control apparatus (10) is configured to provide a pulse-width-modulated control signal at each of the control inputs of the switching elements (T1 to T4), and
- wherein a frequency of the pulse-width-modulated control signal is at least ten times than that of a fundamental frequency of an excitation voltage provided to the resolver (2).
Dependencies are inferred from the claim text.