CN107976209B - Built-in test circuit and method suitable for digital to axial angle converter - Google Patents
Built-in test circuit and method suitable for digital to axial angle converter Download PDFInfo
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Abstract
A built-in test circuit suitable for the digital to shaft angle converter, this circuit is lost the detection circuit by excitation, power lost detection circuit, overflowing locked rotor detection circuit and overheated detection circuit to make up, output built-in test BIT signal through the signal of the above-mentioned four circuit output through the logical operation; the power amplifier enabling signal is output through logical operation by the excitation loss detection circuit, the power loss detection circuit, the overheating detection circuit and the external enabling signal. The invention also discloses a built-in test method suitable for the digital-to-axial angle converter. The circuit and the method can accurately judge and indicate abnormal states such as excitation signal loss, power loss, overheating, overcurrent and the like, and carry out self-protection according to the indication. The device has complete functions and high reliability, and is favorable for popularization and application in the field of angle measurement and control.
Description
Technical Field
The invention belongs to the technical field of signal simulation and test, in particular to a built-in test circuit suitable for a digital to shaft angle converter, and further relates to a built-in test method suitable for the digital to shaft angle converter.
Background
Common shaft angle signals comprise a synchronous machine signal and a resolver signal, a digital-shaft angle converter converts the digital angle signals into the synchronous machine signal and the resolver signal for computer processing, is a core device in the modern shaft angle electronic transformation technology, and is widely applied to the fields of aerospace, aviation, radar, fire control and industrial automation. The circuit structure of the digital-axial angle converter comprises a digital-sine-cosine signal conversion circuit and a sine-cosine-synchronous/resolving signal conversion circuit. The digital-sine-cosine signal conversion circuit is used for converting digital quantity representing angle information into sine-cosine signals of standard voltage for the subsequent sine-cosine-synchronous/resolving signal conversion circuit. The existing digital-axial angle converter lacks a built-in test circuit, cannot judge and indicate abnormal states such as excitation signal loss, power loss, overheating and overcurrent, cannot perform self-protection according to the indication, has incomplete functions and low reliability, and is not beneficial to popularization and application in the field of angle measurement and control.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a new built-in test circuit suitable for a digital-to-axial converter aiming at the defects of the prior art, wherein the circuit can detect a tested circuit in real time and output a working state indicating signal; the output of the sine-cosine-synchronous/resolving signal conversion circuit can be turned off, so that the whole circuit is protected.
Another technical problem to be solved by the present invention is to provide a built-in test method for digital to axis angle converters using the aforementioned circuit.
The technical problem to be solved by the present invention is achieved by the following technical means. The invention relates to a built-in test circuit suitable for a digital to shaft angle converter, which is characterized in that: the circuit consists of an excitation loss detection circuit, a power loss detection circuit, an overcurrent locked rotor detection circuit and an overheat detection circuit. The four signals are subjected to logic operation to output built-in test BIT signals. The excitation loss detection circuit, the power loss detection circuit, the overheating detection circuit and the external enabling signal output power amplification enabling signals through logical operation.
The technical problem to be solved by the present invention can be further achieved by the following technical means. The built-in test circuit is characterized in that the excitation loss detection circuit consists of a subtracter, a half-wave rectification filter circuit and a hysteresis comparator. The subtracter reduces the amplitude of the excitation signal. The half-wave rectification filter circuit converts the amplitude-reduced alternating current excitation signal into a direct current excitation signal. The hysteresis comparator compares the DC excitation signal with an internal reference DC signal and outputs a Loss ofref-test signal.
The technical problem to be solved by the present invention can be further achieved by the following technical means. The built-in test circuit is characterized in that the power loss detection circuit consists of a power input enabling circuit, a subtracter and a hysteresis comparator. The power input enabling circuit realizes +/-15V synchronous power supply, and avoids the phenomenon of single power supply. And the subtracter is used for carrying out amplitude reduction processing on the power supply voltage difference. The hysteresis comparator compares the power supply signal after amplitude reduction processing with an internal reference direct current signal and outputs a Loss of power-test signal.
The technical problem to be solved by the present invention can be further achieved by the following technical means. The built-in test circuit is characterized in that the overcurrent locked rotor detection circuit consists of a current sampling circuit, a half-wave rectification filter circuit, a hysteresis comparator and a locked rotor excitation circuit. The current sampling circuit converts current signals on +/-V of a power supply into voltage signals, the voltage signals are subjected to amplitude reduction and mean value processing by a subtracter, and the voltage signals are processed by a half-wave rectification filter circuit to generate direct-current voltage signals. The Over current-test signal is output after the comparison operation of the hysteresis comparator. Meanwhile, the signal is superposed by 45 degrees and then output to a digital-sine-cosine conversion unit to realize the anti-locked rotor function.
The technical problem to be solved by the present invention can be further achieved by the following technical means. The built-in test circuit is characterized in that the overheat detection circuit comprises a temperature sampling circuit and a hysteresis comparator. The temperature sampling circuit converts the temperature signal into a voltage signal, compares the voltage signal with the hysteresis comparator and outputs an Over temp-test signal.
The technical problem to be solved by the present invention can be further achieved by the following technical means. The invention also discloses a built-in test method suitable for the digital to axial angle converter, which is characterized by comprising the following steps: the built-in test circuit detects the excitation signal, the direct current power supply, the temperature and the current of the tested circuit in real time and outputs a working state indicating signal; excitation loss, power loss, an overheat abnormal state and an external enable signal can output a prohibition signal, and the sine-cosine-synchronous or resolving signal conversion circuit is turned off to output, so that the whole circuit is protected; a control signal can be output through an overcurrent abnormal working state and an external trigger signal, and the anti-stalling circuit is excited, so that the whole circuit is protected.
The built-in test method suitable for the digital-to-axial angle converter is characterized by comprising the following steps of: the method comprises the steps that an excitation Loss detection circuit detects the voltage amplitude of an excitation signal in real time, when the voltage amplitude is normal, a Loss of ref-test signal is output as logic '1', and when the voltage amplitude is small, the Loss of ref-test signal is output as logic '0'; the power Loss detection circuit detects the voltage amplitude of the direct-current power supply in real time, when the voltage amplitude is normal, the Loss of power-test signal is output as logic '1', and when the voltage amplitude is smaller, the Loss of power-test signal is output as logic '0'; the overcurrent locked-rotor detection circuit detects a power supply current signal in real time, outputs an Over current-test signal as logic '0' when the current value is within a normal range, outputs the Over current-test signal as logic '1' when the current value exceeds the normal range, excites the locked-rotor prevention function, and superposes an angle signal of 45 degrees to the digital-sine-cosine signal conversion circuit; the overheating detection circuit detects the core temperature of the output stage power device of the sine-cosine-synchronous or resolving signal conversion circuit in real time, when the temperature value is within a normal range, the Over temp-test signal is output as logic '0', and when the temperature value exceeds the normal range, the Over temp-test signal is output as logic '1'; the four signals are subjected to logic operation processing through a NOR gate, and built-in test BIT signals are output; the Loss of ref-test signal is logic '0', or the Loss of power-test signal is logic '0', or the Over current-test signal is logic '1', or the Over temp-test signal is logic '1', the output BIT signal is logic '0', and the output BIT signal is logic '1' in other states; the Loss of ref-test, the Loss of power-test, the Over temp-test and the external enable signal EN are processed by logical operation through an AND gate, and the power amplifier enable signal is output. When the Loss of ref-test signal is logic '1', the Loss of power-test signal is logic '1', the Over current-test signal is logic '0', and the EN signal is logic '0', the output power amplifier enable signal is logic '1', and the rest is logic '0'.
Compared with the prior art, the built-in test circuit and the built-in test method suitable for the digital-to-axial converter can accurately judge and indicate abnormal states such as excitation signal loss, power loss, overheating and overcurrent, and carry out self-protection according to the indication. The device has complete functions and high reliability, and is favorable for popularization and application in the field of angle measurement and control.
Drawings
FIG. 1 is a general circuit diagram of the built-in test circuit of the present invention;
FIG. 2 is an excitation loss detection circuit diagram of the present invention;
FIG. 3 is a power loss detection circuit diagram of the present invention;
FIG. 4 is a circuit diagram of the overcurrent locked-rotor detection circuit of the present invention;
fig. 5 is a circuit diagram of the overheat detection circuit of the present invention.
Detailed Description
The embodiments of the present invention will be further described with reference to the accompanying drawings so as to facilitate the further understanding of the present invention by those skilled in the art, and do not limit the right thereto.
Embodiment 1, referring to fig. 1, a built-in test circuit suitable for a digital to axial angle converter is composed of an excitation loss detection circuit, a power loss detection circuit, an overcurrent stalling detection circuit and an overheat detection circuit, wherein signals output by the four circuits are subjected to logic operation to output a built-in test BIT signal; the power amplifier enabling signal is output through logical operation by the excitation loss detection circuit, the power loss detection circuit, the overheating detection circuit and the external enabling signal.
Embodiment 2, referring to fig. 2, in the built-in test circuit for a digital to axis angle converter described in embodiment 1: the excitation loss detection circuit consists of a subtracter, a half-wave rectification filter circuit and a hysteresis comparator; the subtracter reduces the amplitude of the excitation signal, the half-wave rectification filter circuit converts the amplitude-reduced alternating current excitation signal into a direct current excitation signal, the hysteresis comparator compares the direct current excitation signal with an internal reference direct current signal, and a Loss of ref-test signal is output.
Embodiment 3, referring to fig. 3, in the built-in test circuit for a digital to axis angle converter described in embodiment 1 or 2: the power loss detection circuit consists of a power input enabling circuit, a subtracter and a hysteresis comparator; the power input enabling circuit realizes +/-15V synchronous power supply, and avoids the phenomenon of single power supply; the subtracter performs amplitude reduction processing on the power voltage difference, and the hysteresis comparator compares the amplitude-reduced power signal with an internal reference direct current signal to output a Loss of power-test signal.
Embodiment 4, referring to fig. 4, in the built-in test circuit for a digital to axis angle converter according to any of embodiments 1 to 3: the overcurrent locked rotor detection circuit consists of a current sampling circuit, a half-wave rectification filter circuit, a hysteresis comparator and a locked rotor excitation circuit; the current sampling circuit converts current signals on +/-V of a power supply into voltage signals, the voltage signals are subjected to amplitude reduction and mean value processing by a subtracter, and the voltage signals are processed by a half-wave rectification filter circuit to generate direct-current voltage signals; performing comparison operation by a hysteresis comparator, and outputting an Over current-test signal; meanwhile, the signal is superposed by 45 degrees and then output to a digital-sine-cosine conversion unit to realize the anti-locked rotor function.
Embodiment 5, referring to fig. 5, any of embodiments 1-4 describes a built-in test circuit for a digital to axis converter, comprising: the overheat detection circuit consists of a temperature sampling circuit and a hysteresis comparator; the temperature sampling circuit converts the temperature signal into a voltage signal, compares the voltage signal with the hysteresis comparator and outputs an Over temp-test signal.
Embodiment 6, a built-in test method for a digital to axis converter, the method using the built-in test circuit of any of embodiments 1 to 5, detecting an excitation signal, a dc power supply, a temperature, and a current of a circuit under test in real time by the built-in test circuit, and outputting a working state indication signal; excitation loss, power loss, an overheat abnormal state and an external enable signal can output a prohibition signal, and the sine-cosine-synchronous or resolving signal conversion circuit is turned off to output, so that the whole circuit is protected; a control signal can be output through an overcurrent abnormal working state and an external trigger signal, and the anti-stalling circuit is excited, so that the whole circuit is protected.
The method comprises the steps that an excitation Loss detection circuit detects the voltage amplitude of an excitation signal in real time, when the voltage amplitude is normal, a Loss of ref-test signal is output as logic '1', and when the voltage amplitude is small, the Loss of ref-test signal is output as logic '0'; the power Loss detection circuit detects the voltage amplitude of the direct-current power supply in real time, when the voltage amplitude is normal, the Loss of power-test signal is output as logic '1', and when the voltage amplitude is smaller, the Loss of power-test signal is output as logic '0'; the overcurrent locked-rotor detection circuit detects a power supply current signal in real time, outputs an Over current-test signal as logic '0' when the current value is within a normal range, outputs the Over current-test signal as logic '1' when the current value exceeds the normal range, excites the locked-rotor prevention function, and superposes an angle signal of 45 degrees to the digital-sine-cosine signal conversion circuit; the overheating detection circuit detects the core temperature of the output stage power device of the sine-cosine-synchronous or resolving signal conversion circuit in real time, when the temperature value is within a normal range, an Over temp-test signal is output as logic '0', and when the temperature value exceeds the normal range, the Over temp-test signal is output as logic '1'; the four signals are subjected to logic operation processing through a NOR gate, and built-in test BIT signals are output; the Loss of ref-test signal is logic '0', or the Loss of power-test signal is logic '0', or the overflow-test signal is logic '1', the BIT signal is output as logic '0', and the BIT signal is output as logic '1' in other states; the Loss of ref-test, the Loss of power-test, the overttemp-test and the external enable signal EN are processed by logical operation through an AND gate, and a power amplifier enable signal is output. When the Loss ofref-test signal is logic '1', the Loss of power-test signal is logic '1', the Over current-test signal is logic '0', and the EN signal is logic '0', the output power amplifier enable signal is logic '1', and the rest is logic '0'.
Embodiment 7, referring to fig. 1, a built-in test circuit for a digital to axial angle converter is composed of an excitation loss detection circuit, a power loss detection circuit, an overcurrent stalling detection circuit, and an overheat detection circuit.
Referring to fig. 2, the excitation loss detection circuit is composed of a subtractor, a half-wave rectification filter circuit, and a hysteresis comparator. The resistors R1, R2, R3, R4 and the operational amplifier N1 form a subtracter, and the exciting signal is subjected to amplitude reduction processing. R1= R2, R3= R4, the gain of the subtracter is 1/VRH-RLAnd outputting the 1V effective value. The diode V1, the resistor R5 and the capacitor C1 form a half-wave rectification filter circuit, the excitation signal after amplitude reduction processing is converted into a direct current signal, and a 0.9V direct current signal is output. The resistors R6, R7, R8, R9 and the operational amplifier N2 form a hysteresis comparator, which compares the 0.9V DC signal with the internal reference DC signal 0.72V to output a 0V or 5V logic level signal Loss of ref-test. That is, when the excitation signal is reduced by 20% or less, an error is output.
Referring to fig. 3, the power loss detection circuit is composed of a power input enable circuit, a subtractor, and a hysteresis comparator. The resistors R10 and R11, the diodes V2 and V3, the solid-state relays N3 and N4 form a power input enabling circuit, external input +/-15 Vin is controlled in a crossed mode, when +/-15 Vin is effective only in one path, a rear-stage circuit does not have a +/-15V power supply, and when +/-15 Vin is effective, the +/-15V power supply of the rear-stage circuit effectively supplies power, so that +/-15V synchronous power supply is achieved, and the phenomenon of single-power-supply power supply is avoided. The resistors R12, R13, R14, R15 and the operational amplifier N5 form a subtracter, amplitude reduction processing is carried out on the voltage difference of +/-15V of the power supply, the gain is 0.9/30, and 0.9V is output. The resistors R16, R17, R18, R19 and the operational amplifier N6 form a hysteresis comparator, which compares the 0.9V power signal with the internal reference DC signal 0.72V and outputs a 0V or 5V logic level signal Loss of power-test. That is, when the DC power supply is reduced by 20% or less, an error is output.
Referring to fig. 4, the overcurrent locked-rotor detection circuit is composed of a current sampling circuit, a half-wave rectification filter circuit, a hysteresis comparator and a locked-rotor excitation circuit. Resistors R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R30, R31, operational amplifiers N7, N8 and N9 form a current sampling circuit, a resistor R20 converts a current signal on a positive power supply + V into a voltage signal, the voltage signal is subjected to amplitude reduction processing by a subtracter consisting of R22, R23, R26, R27 and the operational amplifier N7, and 0.25V is output. The resistor R21 converts the current signal of the negative power supply-V into a voltage signal, and the voltage signal is subjected to amplitude reduction processing by a subtracter consisting of R24, R25, R28, R29 and an operational amplifier N8 to output 0.25V. The two signals are subjected to average value processing through resistors R30 and R31 and an operational amplifier N9, and are output to a half-wave rectification filter circuit consisting of a diode V4, a resistor R32 and a capacitor C2, and a 0.225V direct-current voltage signal is generated. The resistors R33, R34, R35, R36 and the operational amplifier N10 form a hysteresis comparator, the power supply signal of 0.225V is compared with the internal reference direct current signal of 0.9V, and the logic level signal Over current-test of 0V or 5V is output. Namely, when the overcurrent is 4 times or more, the output reports the error. And after the signal is AND-ed with an external kick signal, exclusive OR is carried out between the signal and an input digital angle quantity of 45 degrees, namely, the signal is superposed by 45 degrees and then output to a digital-sine-cosine conversion unit, and the anti-locked rotor function is realized.
Referring to fig. 5, the overheat detection circuit is composed of a temperature sampling circuit and a hysteresis comparator. The resistor R37, the thermistor R38 and the operational amplifier N11 form a temperature sampling circuit, the resistor R38 is a positive temperature coefficient thermistor with the Curie temperature of 140 ℃, the temperature signal of 140 ℃ is converted into a 0.72V voltage signal, and the voltage signal is output to a post-stage circuit after being followed and isolated by the N11. The resistors R39, R40, R41, R42 and the operational amplifier N12 form a hysteresis comparator, the 0.72V direct current voltage is compared with the internal reference direct current signal 0.72V, and the 0V or 5V logic level signal Over temp-test is output. Namely, when the temperature reaches 140 ℃ or above, an error is output.
Claims (4)
1. A built-in test method suitable for the converter of digital to shaft angle, characterized by that, the built-in test circuit that the built-in test method uses is made up of excitation lost detection circuit, power lost detection circuit, overcurrent locked-rotor detection circuit and overheat detection circuit, the signal through said four circuit output is through the logic operation output built-in test BIT signal; the power amplifier enabling signal is output through logical operation by an excitation loss detection circuit, a power loss detection circuit, an overheating detection circuit and an external enabling signal;
the overcurrent locked rotor detection circuit consists of a current sampling circuit, a half-wave rectification filter circuit, a hysteresis comparator and a locked rotor excitation circuit; the current sampling circuit converts current signals on +/-V of a power supply into voltage signals, the voltage signals are subjected to amplitude reduction and mean value processing by a subtracter, and the voltage signals are processed by a half-wave rectification filter circuit to generate direct-current voltage signals; performing comparison operation by a hysteresis comparator, and outputting an Over current-test signal; meanwhile, the signal is superposed by 45 degrees and then output to a digital-sine-cosine conversion unit to realize the anti-locked rotor function;
the built-in test method detects the excitation signal, the direct current power supply, the temperature and the current of the tested circuit in real time through the built-in test circuit and outputs a working state indicating signal; excitation loss, power loss, an overheat abnormal state and an external enable signal can output a prohibition signal, and the sine-cosine-synchronous or resolving signal conversion circuit is turned off to output, so that the whole circuit is protected; a control signal can be output through an overcurrent abnormal working state and an external trigger signal, and the anti-locked loop circuit is excited, so that the whole circuit is protected;
the method comprises the steps that an excitation Loss detection circuit detects the voltage amplitude of an excitation signal in real time, when the voltage amplitude is normal, a Loss of ref-test signal is output as logic '1', and when the voltage amplitude is small, the Loss of ref-test signal is output as logic '0'; the power Loss detection circuit detects the voltage amplitude of the direct-current power supply in real time, and outputs a Loss of power-test signal as logic '1' when the voltage amplitude is normal, and outputs the Loss of power-test signal as logic '0' when the voltage amplitude is small; the Overcurrent locked-rotor detection circuit detects a power supply current signal in real time, outputs an Over current-test signal as logic '0' when the current value is within a normal range, outputs the Over current-test signal as logic '1' when the current value exceeds the normal range, excites the locked-rotor prevention function, and superposes an angle signal of 45 degrees to the digital-sine-cosine signal conversion circuit; the overheating detection circuit detects the core temperature of the output stage power device of the sine-cosine-synchronous or resolving signal conversion circuit in real time, when the temperature value is within a normal range, the Over temp-test signal is output as logic '0', and when the temperature value exceeds the normal range, the Over temp-test signal is output as logic '1'; the four signals are subjected to logic operation processing through a NOR gate, and built-in test BIT signals are output; the Lossof ref-test signal is logic '0', or the Loss of power-test signal is logic '0', or the Over current-test signal is logic '1', or the Over temp-test signal is logic '1', the output BIT signal is logic '0', and the output BIT signal is logic '1' in other states; the Loss ofref-test, the Loss of power-test, the Over temp-test and the external enable signal EN are subjected to logical operation processing through an AND gate, and a power amplifier enable signal is output;
when the Loss of ref-test signal is logic '1', the Loss of power-test signal is logic '1', the overflow-test signal is logic '0', and the EN signal is logic '0', the output power amplifier enable signal is logic '1', and the rest is logic '0'.
2. The built-in test method according to claim 1, wherein: the excitation loss detection circuit consists of a subtracter, a half-wave rectification filter circuit and a hysteresis comparator; the subtracter reduces the amplitude of the excitation signal, the half-wave rectification filter circuit converts the amplitude-reduced alternating current excitation signal into a direct current excitation signal, the hysteresis comparator compares the direct current excitation signal with an internal reference direct current signal, and a Loss of ref-test signal is output.
3. The built-in test method according to claim 1, wherein: the power loss detection circuit consists of a power input enabling circuit, a subtracter and a hysteresis comparator; the power input enabling circuit realizes +/-15V synchronous power supply, and avoids the phenomenon of single power supply; the subtracter performs amplitude reduction processing on the power voltage difference, and the hysteresis comparator compares the amplitude-reduced power signal with an internal reference direct current signal to output a Loss of power-test signal.
4. The built-in test method according to claim 1, wherein: the overheat detection circuit consists of a temperature sampling circuit and a hysteresis comparator; the temperature sampling circuit converts the temperature signal into a voltage signal, compares the voltage signal with the hysteresis comparator and outputs an Over temp-test signal.
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| CN105716520A (en) * | 2016-04-12 | 2016-06-29 | 中国人民解放军武汉军械士官学校 | Axial angle measurement and control system and method for axial angle sensor |
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