CN106841763B - Voltage detection circuit and voltage detection method for medium-voltage and high-voltage variable-frequency speed regulation device - Google Patents
Voltage detection circuit and voltage detection method for medium-voltage and high-voltage variable-frequency speed regulation device Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a voltage detection circuit and a voltage detection method of a medium-voltage and high-voltage variable-frequency speed regulation device, which relate to the technical field of variable-frequency speed regulation and comprise a phase-shifting transformer for converting high voltage into 380V low-voltage; the differential amplifying circuit is used for converting the phase voltage into-5V to +5V alternating current signals; a first voltage follower circuit and a second voltage follower circuit for increasing input impedance and decreasing output impedance; and an inverting adder circuit including an operational amplifier circuit and a reference voltage circuit for adding the three-phase voltage to the reference voltage value, the phase voltage being converted into a direct current signal. The voltage detection circuit of the medium-voltage and high-voltage variable-frequency speed regulation device replaces a voltage transformer with the differential amplifying circuit, the voltage follower circuit and the inverse addition circuit, and avoids harmonic errors existing in the detection of input voltage of the traditional medium-voltage and high-voltage variable-frequency speed regulation device.
Description
Technical Field
The invention relates to the technical field of variable frequency speed regulation, in particular to a voltage detection circuit and a voltage detection method of a medium-voltage and high-voltage variable frequency speed regulation device.
Background
For the medium-high voltage variable frequency speed regulating device, the input voltage needs to be detected in real time so that the main control system can realize V/F control or vector control algorithm and voltage display; meanwhile, certain control and protection functions of the medium-voltage and high-voltage variable-frequency speed regulating device can be realized only by real-time and accurate voltage detection.
At present, input voltage detection of a medium-voltage and high-voltage variable-frequency speed regulating device is usually performed through an electromagnetic voltage transformer, and the voltage detection mode has the following defects: firstly, the voltage transformer has larger volume, which affects the use; and secondly, when the voltage transformer is used for measuring the input voltage of the medium-voltage and high-voltage variable-frequency speed regulating device, the measurement error is larger due to the harmonic wave of the medium-voltage and high-voltage input voltage.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a voltage detection circuit and a voltage detection method of a medium-voltage and high-voltage variable-frequency speed regulating device with good electric insulation capability and anti-interference capability.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the utility model provides a well, high voltage variable frequency speed adjusting device voltage detection circuit, it is used for generating voltage detection signal to DSP main control chip comparison analysis, includes:
the phase-shifting transformer is used for converting high voltage into 380V low-voltage;
the differential amplifying circuit is used for converting the phase voltage into-5V to +5V alternating current signals;
a first voltage follower circuit and a second voltage follower circuit for increasing input impedance and decreasing output impedance;
and an inverting adder circuit including an operational amplifier circuit and a reference voltage circuit for adding the three-phase voltage to the reference voltage value, and converting the phase voltage into a direct-current voltage detection signal.
On the basis of the technical scheme, the phase-shifting transformer is a multi-secondary-side phase-shifting transformer and is provided with an auxiliary winding.
On the basis of the technical scheme, each auxiliary winding side phase of the phase-shifting transformer is connected with N phases and one differential amplifying circuit.
On the basis of the technical scheme, the intelligent control device further comprises an RC filter circuit, one end of the RC filter circuit is connected with the second voltage follower circuit, and the other end of the RC filter circuit is connected with the AD sampling pin of the DSP main control chip.
On the basis of the technical scheme, one end of the first voltage follower circuit in each phase of the voltage detection circuit is connected with the differential amplifying circuit, and the other end of the first voltage follower circuit is connected with the inverting adding circuit; one end of the second voltage follower circuit is connected with the inverting adder circuit, and the other end of the second voltage follower circuit is connected with the filtering processing circuit.
On the basis of the technical scheme, the differential amplifying circuit comprises a first operational amplifier, a first resistor string, a second resistor string, a first diode and a second diode; the non-inverting input end of the first operational amplifier is connected with a second resistor string and a second diode; the second resistor and the second capacitor are connected in parallel, one ends of the second resistor and the second capacitor are grounded, and the other ends of the second resistor and the second capacitor are connected with the first operational amplifier; one end of the second resistor string is connected with the input end of the second diode, and the other end of the second resistor string is connected with the auxiliary winding side phase voltage output end of the phase-shifting transformer; the inverting input end of the first operational amplifier is connected with a first resistor string and a first diode; the second operational amplifier is connected with the first operational amplifier output end through a second capacitor; one end of the first resistor string is connected with the input end of the first diode, and the other end of the first resistor string is connected with the auxiliary winding side phase zero line output end of the phase-shifting transformer.
On the basis of the technical scheme, the first voltage follower circuit comprises a second operational amplifier, a third resistor and a third capacitor; the inverting input end of the second operational amplifier is connected with the output end of the second operational amplifier and a third resistor; the other end of the third resistor is connected with a third capacitor, and the other end of the third capacitor is grounded; the non-inverting input end of the second operational amplifier is connected with the output end of the first operational amplifier.
On the basis of the technical scheme, the inverting adder circuit comprises a third operational amplifier, a third resistor string, a fourth resistor, a fifth resistor, a sixth resistor, a fourth capacitor and a fifth capacitor; the non-inverting input end of the third operational amplifier is connected with a sixth resistor, and the other end of the sixth resistor is grounded; the inverting input end of the third operational amplifier is connected with a fourth resistor string, a third resistor string, a fourth resistor and a fourth capacitor, the fourth resistor is connected with the fourth capacitor in parallel, and the other ends of the fourth resistor and the fourth capacitor are connected with the output end of the third operational amplifier and a fifth resistor; the other end of the fifth resistor is connected with a fifth capacitor, and the other end of the fifth capacitor is grounded; the other end of the fourth resistor string is connected with a third resistor, and the other end of the third resistor is connected with the output end of the second operational amplifier; the other end of the third resistor string is connected with the reference phase voltage.
On the basis of the technical scheme, the second voltage follower circuit comprises a fourth operational amplifier, a seventh resistor, an eighth resistor, a sixth capacitor and a third diode; the inverting input end of the fourth operational amplifier is connected with a seventh resistor and a sixth capacitor, the seventh resistor is connected with the sixth capacitor in parallel, and the other ends of the seventh resistor and the sixth capacitor are connected with the output end of the fourth operational amplifier and an eighth resistor; the other end of the eighth resistor is connected with a third diode and an AD sampling pin of the DSP main control chip; and the non-inverting input end of the fourth operational amplifier is connected with the fifth resistor and the fifth capacitor.
The invention also provides a method for detecting the input voltage of the medium-voltage and high-voltage variable-frequency speed regulating device, which comprises the following steps:
s1, changing high voltage at an input side into a 380V voltage signal by using a phase-shifting transformer with an auxiliary winding;
s2, converting the 380V voltage signal into a-5V to +5V alternating voltage signal by using a differential amplifying circuit, and outputting the alternating voltage signal to an inverting adding circuit through a voltage follower circuit;
s3, adding the-5V to +5V alternating voltage signal with a reference voltage value by using an inverting addition circuit, converting the-5V to +5V alternating voltage signal into a 0 to +3V direct voltage detection signal, and transmitting the signal to an AD sampling pin of a DSP main control chip after voltage following circuit and filtering treatment;
s4, the DSP main control chip compares the collected direct-current voltage detection signal with a preset normal value, and if the direct-current voltage detection signal is in a normal range, no action is generated; if the frequency is beyond the normal range, an alarm signal is sent to the control end of the variable-frequency speed regulating device.
Compared with the prior art, the invention has the advantages that:
(1) The voltage detection circuit of the medium-high voltage variable frequency speed regulating device replaces a voltage transformer with the differential amplifying circuit, the voltage follower circuit and the inverting adder circuit, and avoids harmonic errors existing in the input voltage detection of the traditional medium-high voltage variable frequency speed regulating device using the voltage transformer.
(2) The voltage detection circuit of the medium-voltage and high-voltage variable-frequency speed regulating device uses the multi-secondary-side phase-shifting transformer with the auxiliary winding to perform transformation operation, can restrain the harmonic wave of input voltage and reduces the additional error of measurement.
(3) The voltage detection method of the medium-voltage and high-voltage variable-frequency speed regulating device does not need to use a voltage transformer, reduces the equipment volume and is convenient to use and install.
Drawings
FIG. 1 is a schematic block diagram of a voltage detection method of a medium-high voltage variable frequency speed regulating device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an A-phase voltage sampling differential amplifying circuit and a voltage follower circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an A-phase voltage sampling inverting adder circuit and a voltage follower circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a B-phase voltage sampling differential amplifier circuit and a voltage follower circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a B-phase voltage sampling inverting adder circuit and a voltage follower circuit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a C-phase voltage sampling differential amplifier circuit and a voltage follower circuit according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a C-phase voltage sampling inverting adder circuit and a voltage follower circuit according to an embodiment of the present invention;
in the figure: 1-a first resistor string, 2-a second resistor string.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, an embodiment of the present invention provides a voltage detection circuit of a medium and high voltage variable frequency speed regulation device, including:
the phase-shifting transformer is used for converting high voltage into 380V low-voltage;
the differential amplifying circuit is used for converting the phase voltage into-5V to +5V alternating current signals;
a first voltage follower circuit and a second voltage follower circuit for increasing input impedance and decreasing output impedance;
and an inverting adder circuit including an operational amplifier circuit and a reference voltage circuit for adding the three-phase voltage to the reference voltage value, the phase voltage being converted into a direct current signal.
Further, the circuit also comprises an RC filter circuit, one end of the RC filter circuit is connected with the second voltage follower circuit, and the other end of the RC filter circuit is connected with the AD sampling pin of the DSP main control chip. The harmonic wave can be further removed before the detection signal is input into the main control chip, and the measurement error is reduced
Further, the phase-shifting transformer can be selected as a multi-secondary-side phase-shifting transformer and is provided with an auxiliary winding. This arrangement suppresses harmonics of the input voltage and reduces additional errors in the measurement.
Further, each auxiliary winding side phase of the phase-shifting transformer is connected with N phases and one differential amplifying circuit.
Further, one end of the first voltage follower circuit in each phase of the voltage detection circuit is connected with the differential amplifying circuit, and the other end of the first voltage follower circuit is connected with the inverting addition circuit; one end of the second voltage follower circuit is connected with the inverting adder circuit, and the other end of the second voltage follower circuit is connected with the filtering processing circuit.
FIG. 2 is a schematic diagram of an A-phase voltage sampling differential amplifying circuit and a voltage follower circuit in one embodiment of the practical method for detecting input voltage at medium and high voltage frequency conversion speed, wherein the differential amplifying circuit comprises an operational amplifier U2A, resistors R5, R6, R7, R8, R9, R10, R11, R12, R13 and R14, resistors R21, R22, R23, R24, R25, R26, R27, R28, R29 and R30, diodes D1 and D3, resistors R15 and R31 and capacitors C4 and C10; the noninverting input end of the operational amplifier U2A is connected with resistors R30 and R31, a diode D3 and a capacitor C10, and the diode D3 plays a clamping role; the other end of the resistor R30 is connected with resistors R21, R22, R23, R24, R25, R26, R27, R28 and R29 in series, and the other end of the resistor R23 is connected with the phase output end of the auxiliary winding side A of the phase-shifting transformer; the resistor R31 is connected with the capacitor C10 in parallel, and the other ends of the resistor R31 and the capacitor C10 are grounded; the inverting input end of the operational amplifier U2A is connected with resistors R14 and R15, a diode D1 and a capacitor C4, and the diode D1 plays a clamping role; the other end of the resistor R14 is connected with R5, R6, R7, R8, R9, R10, R11, R12 and R13 in series, and the other end of the resistor R7 is connected with the N-phase output end of the auxiliary winding side of the phase-shifting transformer; the resistor R15 and the capacitor C4 are connected in parallel, and the other ends of the resistor R15 and the capacitor C4 are connected with the output end of the operational amplifier U2A;
the voltage follower circuit comprises an operational amplifier U2B, a resistor R19 and a capacitor C8; the inverting input end of the operational amplifier U2B is connected with the output end of the operational amplifier U2B and the resistor R19; the other end of the resistor R19 is connected with the capacitor C8, the other end of the capacitor C8 is grounded, and the resistor R19 and the capacitor C8 form an RC filter circuit; and the non-inverting input end of the operational amplifier U2B is connected with the output end of the operational amplifier U2A.
FIG. 3 is a schematic diagram of an A-phase voltage sampling inverting adder circuit and a voltage follower circuit in one embodiment of the practical medium-voltage and high-voltage frequency-conversion speed-regulating input voltage detection method, wherein the inverting adder circuit comprises an operational amplifier U1A, resistors R1, R2, R3, R16, R18 and R20 and capacitors C1 and C6; the noninverting input end of the operational amplifier U1A is connected with a resistor R20, and the other end of the resistor R20 is grounded; the inverting input end of the operational amplifier U1A is connected with resistors R16, R2 and R3 and a capacitor C1, the resistor R3 is connected with the capacitor C1 in parallel, the other end of the resistor R3 and the capacitor C1 are connected with the output end of the operational amplifier U1A and a resistor R18, the other end of the resistor R18 is connected with a capacitor C6, the other end of the capacitor C6 is grounded, and the resistor R18 and the capacitor C6 form an RC filter circuit; the other end of the resistor R16 is connected with a resistor R19, and the other end of the resistor R19 is connected with the output end of the operational amplifier U2B; the other end of the resistor R2 is connected with the resistor R1, and the other end of the resistor R1 is connected with the A-phase reference voltage;
the voltage follower circuit comprises an operational amplifier U1B, resistors R4 and R17, a capacitor C2 and a diode D2; the inverting input end of the operational amplifier U1B is connected with a resistor R4 and a capacitor C2, the resistor R4 is connected with the capacitor C2 in parallel, and the other ends of the resistor R4 and the capacitor C2 are connected with the output end of the operational amplifier U1B and a seventh resistor; the other end of the seventh resistor is connected with a diode D2 and an AD sampling pin of the DSP main control chip, and the diode D2 plays a clamping role; the non-inverting input end of the operational amplifier U1B is connected with a resistor R18 and a capacitor C6, the resistor R18 and the capacitor C6 form an RC filter circuit, and the resistor R18 is connected with the output end of the operational amplifier U1A.
FIG. 4 is a schematic diagram of a B-phase voltage sampling differential amplifying circuit and a voltage follower circuit in one embodiment of the practical method for detecting input voltage of high-voltage variable frequency and high-speed, wherein the differential amplifying circuit comprises an operational amplifier U3A, resistors R32, R33, R34, R35, R36, R37, R38, R41, R42 and R43, resistors R48, R49, R52, R53, R54, R55, R56, R58, R59 and R60, diodes D4 and D6, resistors R44 and R62 and capacitors C11 and C19; the noninverting input end of the operational amplifier U3A is connected with resistors R60 and R62, a diode D6 and a capacitor C19, and the diode D6 plays a clamping role; the other end of the resistor R60 is connected with resistors R48, R49, R52, R53, R54, R55, R56, R58 and R59 in series, and the other end of the resistor R59 is connected with the phase B output end of the auxiliary winding side of the phase shifting transformer; the resistor R62 is connected with the capacitor C19 in parallel, and the other ends of the resistor R62 and the capacitor C19 are grounded; the inverting input end of the operational amplifier U3A is connected with resistors R43 and R44, a diode D4 and a capacitor C11, and the diode D4 plays a clamping role; the other end of the resistor R43 is connected with R32, R33, R34, R35, R36, R37, R38, R41 and R42 in series, and the other end of the resistor R34 is connected with the N-phase output end of the auxiliary winding side of the phase-shifting transformer; the resistor R44 and the capacitor C11 are connected in parallel, and the other ends of the resistor R44 and the capacitor C11 are connected with the output end of the operational amplifier U3A;
the voltage follower circuit comprises an operational amplifier U3B, a resistor R47 and a capacitor C16; the inverting input end of the operational amplifier U3B is connected with the output end of the operational amplifier U3B and a resistor R47; the other end of the resistor R47 is connected with the capacitor C16, the other end of the capacitor C16 is grounded, and the resistor R47 and the capacitor C16 form an RC filter circuit; and the non-inverting input end of the operational amplifier U3B is connected with the output end of the operational amplifier U3A.
FIG. 5 is a schematic diagram of a B-phase voltage sampling inverting adder circuit and a voltage follower circuit in one embodiment of the practical medium-voltage and high-voltage variable-frequency and speed-regulating input voltage detection method, wherein the inverting adder circuit comprises an operational amplifier U4A, resistors R39, R40, R45, R50, R57 and R61 and capacitors C12 and C18; the noninverting input end of the operational amplifier U4A is connected with a resistor R61, and the other end of the resistor R61 is grounded; the inverting input end of the operational amplifier U4A is connected with resistors R40, R45 and R50 and a capacitor C12, the resistor R45 is connected with the capacitor C12 in parallel, the other end of the resistor R45 and the other end of the capacitor C12 are connected with the output end of the operational amplifier U4A and a resistor R57, the other end of the resistor R57 is connected with a capacitor C18, the other end of the capacitor C18 is grounded, and the resistor R57 and the capacitor C18 form an RC filter circuit; the other end of the resistor R50 is connected with a resistor R47, and the other end of the resistor R47 is connected with the output end of the operational amplifier U3B; the other end of the resistor R40 is connected with a resistor R39, and the other end of the resistor R39 is connected with a B-phase reference voltage;
the voltage follower circuit comprises an operational amplifier U4B, resistors R46 and R51, a capacitor C14 and a diode D5; the inverting input end of the operational amplifier U4B is connected with a resistor R46 and a capacitor C14, the resistor R46 is connected with the capacitor C14 in parallel, and the other end of the resistor R46 and the capacitor C14 is connected with the output end of the operational amplifier U4B and a resistor R51; the other end of the resistor R51 is connected with a diode D5 and an AD sampling pin of the DSP main control chip, and the diode D5 plays a clamping role; the non-inverting input end of the operational amplifier U4B is connected with a resistor R57 and a capacitor C18, the resistor R57 and the capacitor C18 form an RC filter circuit, and the resistor R57 is connected with the output end of the operational amplifier U4A.
FIG. 6 is a schematic diagram of a C-phase voltage sampling differential amplifying circuit and a voltage follower circuit in one embodiment of the practical method for detecting input voltage of high-voltage variable frequency and speed, wherein the differential amplifying circuit comprises an operational amplifier U5A, resistors R63, R64, R65, R66, R67, R68, R69, R70, R71 and R72, resistors R78, R79, R81, R82, R83, R84, R85, R86, R87 and R88, diodes D7 and D8, resistors R73 and R89 and capacitors C21 and C28; the noninverting input end of the operational amplifier U5A is connected with resistors R88 and R89, a diode D8 and a capacitor C28, and the diode D8 plays a clamping role; the other end of the resistor R88 is connected with resistors R78, R79, R81, R82, R83, R84, R85, R86 and R87 in series, and the other end of the resistor R81 is connected with the C-phase output end of the auxiliary winding side of the phase-shifting transformer; the resistor R89 is connected with the capacitor C28 in parallel, and the other ends of the resistor R89 and the capacitor C28 are grounded; the inverting input end of the operational amplifier U5A is connected with resistors R72 and R73, a diode D7 and a capacitor C21, and the diode D7 plays a clamping role; the other end of the resistor R72 is connected with R63, R64, R65, R66, R67, R68, R69, R70 and R71 in series, and the other end of the resistor R65 is connected with the N-phase output end of the auxiliary winding side of the phase-shifting transformer; the resistor R73 and the capacitor C21 are connected in parallel, and the other ends of the resistor R73 and the capacitor C21 are connected with the output end of the operational amplifier U5A;
the voltage follower circuit comprises an operational amplifier U5B, a resistor R74 and a capacitor C23; the inverting input end of the operational amplifier U5B is connected with the output end of the operational amplifier U5B and the resistor R74; the other end of the resistor R74 is connected with the capacitor C23, the other end of the capacitor C23 is grounded, and the resistor R74 and the capacitor C23 form an RC filter circuit; and the non-inverting input end of the operational amplifier U5B is connected with the output end of the operational amplifier U5A.
FIG. 7 is a schematic diagram of a C-phase voltage sampling inverting adder circuit and a voltage follower circuit in one embodiment of the practical medium-voltage and high-voltage variable-frequency and speed-regulating input voltage detection method, wherein the inverting adder circuit comprises an operational amplifier U6A, resistors R75, R76, R77, R90, R92 and R93 and capacitors C25 and C29; the noninverting input end of the operational amplifier U6A is connected with a resistor R93, and the other end of the resistor R93 is grounded; the inverting input end of the operational amplifier U6A is connected with resistors R76, R77 and R90 and a capacitor C25, the resistor R77 is connected with the capacitor C25 in parallel, the other end of the resistor R77 and the other end of the capacitor C25 are connected with the output end of the operational amplifier U6A and a resistor R92, the other end of the resistor R92 is connected with a capacitor C29, the other end of the capacitor C29 is grounded, and the resistor R92 and the capacitor C29 form an RC filter circuit; the other end of the resistor R90 is connected with a resistor R74, and the other end of the resistor R74 is connected with the output end of the operational amplifier U5B; the other end of the resistor R76 is connected with a resistor R75, and the other end of the resistor R75 is connected with a B-phase reference voltage;
the voltage follower circuit comprises an operational amplifier U6B, resistors R80 and R91, a capacitor C26 and a diode D9; the inverting input end of the operational amplifier U6B is connected with a resistor R80 and a capacitor C26, the resistor R80 is connected with the capacitor C26 in parallel, and the other ends of the resistor R80 and the capacitor C26 are connected with the output end of the operational amplifier U6B and a resistor R91; the other end of the resistor R91 is connected with a diode D9 and an AD sampling pin of the DSP main control chip, and the diode D9 plays a clamping role; the non-inverting input end of the operational amplifier U6B is connected with a resistor R92 and a capacitor C29, the resistor R92 and the capacitor C29 form an RC filter circuit, and the resistor R92 is connected with the output end of the operational amplifier U6A.
Preferably, the operational amplifier used in the above embodiment has a model TL082ID and the diode has a model MMBD7000LT1.
The invention also provides a method for detecting the input voltage of the medium-voltage and high-voltage variable-frequency speed regulating device, which comprises the following steps:
s1, changing high voltage at an input side into a 380V voltage signal by using a phase-shifting transformer with an auxiliary winding;
s2, converting the 380V voltage signal into a-5V to +5V alternating voltage signal by utilizing a differential amplifying circuit, and outputting the alternating voltage signal through a voltage follower circuit;
s3, adding the-5V to +5V alternating current voltage signal and a reference voltage value by using an inverting addition circuit, converting the-5V to +5V alternating current signal into a 0 to +3V direct current signal, and sending the signal to an AD sampling pin of a DSP main control chip for calculation processing after voltage following circuit and filtering processing.
S4, the DSP main control chip compares the collected direct-current voltage detection signal with a preset normal value, and if the direct-current voltage detection signal is in a normal range, no action is generated; if the frequency is beyond the normal range, an alarm signal is sent to the control end of the variable-frequency speed regulating device.
The invention is not limited to the embodiments described above, but a number of modifications and adaptations can be made by a person skilled in the art without departing from the principle of the invention, which modifications and adaptations are also considered to be within the scope of the invention. What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (5)
1. The utility model provides a well, high voltage variable frequency speed regulator voltage detection circuit, its is used for generating voltage detection signal to DSP main control chip comparison analysis, its characterized in that includes:
the phase-shifting transformer is used for converting high voltage into 380V low-voltage;
the differential amplifying circuit is used for converting the phase voltage into-5V to +5V alternating current signals;
a first voltage follower circuit and a second voltage follower circuit for increasing input impedance and decreasing output impedance;
an inverting adder circuit including an operational amplifier circuit and a reference voltage circuit for adding the three-phase voltage to the reference voltage value, converting the phase voltage into a direct-current voltage detection signal; one end of the first voltage follower circuit in each phase of the voltage detection circuit is connected with the differential amplifying circuit, and the other end of the first voltage follower circuit is connected with the inverting adder circuit; one end of the second voltage follower circuit is connected with the inverting adder circuit, and the other end of the second voltage follower circuit is connected with the AD sampling pin of the DSP main control chip;
the phase-shifting transformer is a multi-secondary-side phase-shifting transformer and is provided with auxiliary windings, and each auxiliary winding side phase of the phase-shifting transformer is connected with N phases and one differential amplifying circuit;
the differential amplifying circuit comprises a first operational amplifier U2A, U3A, U A, a first resistor string (1), a second resistor string (2), first diodes D1, D4 and D7 and second diodes D3, D6 and D8; the non-inverting input end of the first operational amplifier is connected with a second resistor string and a second diode; the circuit also comprises second resistors R31, R62 and R89 which are connected in parallel, second capacitors C10, C19 and C28, wherein one ends of the second resistors and the second capacitors are grounded, and the other ends of the second resistors and the second capacitors are connected with the first operational amplifier; one end of the second resistor string is connected with the input end of the second diode, and the other end of the second resistor string is connected with the auxiliary winding side phase voltage output end of the phase-shifting transformer; the inverting input end of the first operational amplifier is connected with a first resistor string and a first diode; the first operational amplifier further comprises first resistors R15, R44 and R78 which are connected in parallel with the first capacitors C4, C11 and C21, and the other ends of the first resistors and the first capacitors are connected with the output end of the first operational amplifier; one end of the first resistor string is connected with the input end of the first diode, and the other end of the first resistor string is connected with the auxiliary winding side phase zero line output end of the phase-shifting transformer.
2. The voltage detection circuit of the medium-voltage and high-voltage variable-frequency speed regulating device as claimed in claim 1, wherein: the first voltage follower circuit comprises a second operational amplifier U2B, U3B, U B, third resistors R19, R47 and R74 and third capacitors C8, C16 and C23; the inverting input end of the second operational amplifier is connected with the output end of the second operational amplifier and a third resistor; the other end of the third resistor is connected with a third capacitor, and the other end of the third capacitor is grounded; the non-inverting input end of the second operational amplifier is connected with the output end of the first operational amplifier.
3. The voltage detection circuit of the medium-voltage and high-voltage variable-frequency speed regulating device as claimed in claim 2, wherein: the inverting adder circuit comprises a third operational amplifier U1A, U, 4 and A, U A and third resistor strings R1 and R2; r39, R40; r75, R76, fourth resistor string R16, R50, R90, fourth resistor R3, R45, R77, fifth resistor R18, R57, R92, sixth resistor R20, R61, R93, fourth capacitor C1, C12, C25, and fifth capacitor C6, C18, C29; the non-inverting input end of the third operational amplifier is connected with a sixth resistor, and the other end of the sixth resistor is grounded; the inverting input end of the third operational amplifier is connected with a fourth resistor string, a third resistor string, a fourth resistor and a fourth capacitor, the fourth resistor is connected with the fourth capacitor in parallel, and the other ends of the fourth resistor and the fourth capacitor are connected with the output end of the third operational amplifier and a fifth resistor; the other end of the fifth resistor is connected with a fifth capacitor, and the other end of the fifth capacitor is grounded; the other end of the fourth resistor string is connected with a third resistor, and the other end of the third resistor is connected with the output end of the second operational amplifier; the other end of the third resistor string is connected with the reference phase voltage.
4. The voltage detection circuit of the medium-voltage and high-voltage variable-frequency speed regulating device as claimed in claim 3, wherein: the second voltage follower circuit comprises a fourth operational amplifier U1B, U, 4 and B, U B, seventh resistors R4, R46 and R80, eighth resistors R17, R51 and R91, sixth capacitors C2, C14 and C26 and third diodes D2, D5 and D9; the inverting input end of the fourth operational amplifier is connected with a seventh resistor and a sixth capacitor, the seventh resistor is connected with the sixth capacitor in parallel, and the other ends of the seventh resistor and the sixth capacitor are connected with the output end of the fourth operational amplifier and an eighth resistor; the other end of the eighth resistor is connected with a third diode and an AD sampling pin of the DSP main control chip; and the non-inverting input end of the fourth operational amplifier is connected with the fifth resistor and the fifth capacitor.
5. The method for detecting the input voltage of the medium-high voltage variable-frequency speed regulating device, which uses the voltage detection circuit of the medium-high voltage variable-frequency speed regulating device as claimed in claim 1, is characterized by comprising the following steps:
s1, changing high voltage at an input side into a 380V voltage signal by using a phase-shifting transformer with an auxiliary winding;
s2, converting the 380V voltage signal into an alternating voltage signal of minus 5V to plus 5V by using a differential amplifying circuit, and outputting the alternating voltage signal to an inverting adding circuit through a voltage follower circuit;
s3, adding the-5V to +5V alternating voltage signal with a reference voltage value by using an inverting adding circuit, converting the-5V to +5V alternating voltage signal into a 0 to +3V direct voltage detection signal, and transmitting the signal to an AD sampling pin of a DSP main control chip after voltage following circuit and filtering treatment;
s4, the DSP main control chip compares the collected direct-current voltage detection signal with a preset normal value, and if the direct-current voltage detection signal is in a normal range, no action is generated; if the frequency is beyond the normal range, an alarm signal is sent to the control end of the variable-frequency speed regulating device.
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| CN109861175B (en) * | 2019-01-31 | 2020-08-04 | 大禹电气科技股份有限公司 | Voltage sampling and protecting circuit of power unit |
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