CN114966155A - Direct-current signal isolation module applied to airborne power supply large-current detection device - Google Patents
Direct-current signal isolation module applied to airborne power supply large-current detection device Download PDFInfo
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Abstract
The invention provides a direct-current signal isolation module applied to an airborne power supply large-current detection device, which comprises a printed circuit board, wherein a power supply oscillation circuit, a power supply transformer circuit, an input isolation power supply circuit, a modulation circuit, a signal transformer circuit, a demodulation circuit and a filter circuit are integrated on the printed circuit board; the power transformer circuit is used for converting a reference demodulation reference signal generated by the power oscillation circuit into a reference modulation reference signal; a first analog switch chip of the modulation circuit and a signal transformer circuit are used together for modulating a reference signal according to a reference, and chopping a detection signal from a signal input interface into square wave pulses; and the second analog switch chip of the demodulation circuit and the signal transformer circuit demodulate the reference signal together according to the reference, and the square wave pulse is restored into a direct current signal. The invention not only reduces the cost, but also can be realized by completely using domestic electronic elements, thereby avoiding the instability of supply.
Description
Technical Field
The invention relates to the field of current detection, in particular to a direct-current signal isolation module applied to a large-current detection device of an airborne power supply.
Background
The airborne power supply heavy current detection needs to use a direct current signal isolation module of a Printed Circuit Board (PCB) contact pin type mounting structure, and the specification requirements are as follows: the power is supplied by DC plus or minus 12V, the input DC is DC-100mV to +100mV, the output DC is DC-10V to +10V, and the size is 30mm in length and 21mm in width.
Meanwhile, the direct current signal isolation module needs to meet the requirements that the precision is within 1 per thousand, the linear error is not more than 0.5 per thousand, the working temperature range is-40 ℃ to 85 ℃, the maximum temperature drift is less than or equal to 35 ppm/DEG C (within the full temperature range), and the power consumption is less than or equal to 0.1W. Meanwhile, in order to meet the stability requirement, the input and output/power isolation withstand voltage of the direct current signal isolation module needs to be not less than DC2KV, the SURGE of EOS (for PIN): 200V (GB/T17626.542 Ω), electrostatic discharge ESD: +/-6 KV (GB/T17626.2 contact discharge). In addition, the direct-current signal isolation module bare engine also needs to pass through GJB 151B-2013, namely RE102 (applicable to the interiors of fixed wings of airplanes and space systems, and the distance between the head and the tail is not less than 25 meters, 10 KHz-18 GHz); CS114 (aircraft interior curve three 1MHz to 400 MHz); RS103 (airplane interior air force 10 KHz-1 GHz 20V/m 1 GHz-18 GHz 60V/m), and the like.
In order to meet the requirements of the performance indexes, the existing direct current signal isolation module mostly adopts electronic elements imported from abroad, so that the cost is relatively high, and the risk of unstable supply exists.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a direct current signal isolation module applied to an airborne power supply large current detection device, aiming at the problems of high cost and unstable supply of the direct current signal isolation module caused by the adoption of foreign imported electronic elements.
The technical scheme for solving the technical problems is that the invention provides a direct current signal isolation module applied to an airborne power supply large current detection device, wherein the direct current signal isolation module comprises a printed circuit board which is arranged on a main circuit board in a pin inserting mode, and a power supply oscillation circuit, a power supply transformer circuit, an input isolation power supply circuit, a modulation circuit, a signal transformer circuit, a demodulation circuit and a filter circuit are integrated on the printed circuit board; wherein:
the power supply oscillating circuit is connected with the direct current input interface and is used for generating a reference demodulation reference signal; the power transformer circuit and the input isolation power circuit are sequentially electrically connected with the power oscillation circuit and convert a reference demodulation reference signal generated by the power oscillation circuit into a reference modulation reference signal;
the modulation circuit comprises a first analog switch chip, the first analog switch chip is electrically connected with the primary side of the signal transformer circuit and is used together with the signal transformer circuit to chop a detection signal from the signal input interface into square wave pulses according to a reference modulation reference signal from the input isolation power supply circuit; the demodulation circuit comprises a second analog switch chip, the second analog switch chip is electrically connected with the secondary side of the signal transformer circuit and is used for reducing the square wave pulse into a direct current signal together with the signal transformer circuit according to a reference demodulation reference signal from the power supply oscillation circuit;
and the filter circuit is electrically connected with the secondary side of the signal transformer circuit and outputs the direct current signal after filtering.
As a further improvement of the present invention, the signal transformer circuit includes a first transformer, a detection signal from a signal input interface is input by a middle tap on a primary side of the first transformer, and the dc signal is output by a middle tap on a secondary side of the first transformer;
the first analog switch chip comprises a first signal input terminal and two first signal output terminals, the reference modulation reference signal is input by the first signal input terminal, and the two first signal output terminals are respectively and electrically connected with two end pins on the primary side of the first transformer; the second analog switch chip comprises a second signal input terminal and two second signal output terminals, the reference demodulation reference signal is input by the second signal input terminal, and the two second signal output terminals are respectively and electrically connected with two end pins on the secondary side of the first transformer.
As a further improvement of the present invention, the power supply oscillation circuit includes a first schmitt trigger, a second schmitt trigger, a first single-double input nand gate, a second single-double input nand gate, a first high frequency field effect transistor, and a second high frequency field effect transistor, wherein:
a second channel output pin of the first Schmitt trigger is electrically connected with a first channel input pin of the second Schmitt trigger; a second channel output pin of the second Schmitt trigger is electrically connected with the input end of the first single-double input NAND gate, and a first channel output pin of the second Schmitt trigger is electrically connected with the input end of the second single-double input NAND gate; the output end of the first single-double input NAND gate is electrically connected with the grid electrode of the first high-frequency field effect transistor, and the reference demodulation reference signal is formed on the drain electrode of the first high-frequency field effect transistor; the output end of the second single-double input NAND gate is electrically connected with the grid of the second high-frequency field effect transistor, and a signal which has the same amplitude as the reference demodulation reference signal and is opposite in phase is formed on the drain of the second high-frequency field effect transistor.
As a further improvement of the present invention, the power supply oscillation circuit includes a first low dropout regulator and a second low dropout regulator, and a voltage input pin of the first low dropout regulator is electrically connected to a positive voltage pin of the dc input interface, a voltage output pin of the first low dropout regulator is electrically connected to a voltage input pin of the second low dropout regulator, and the first schmitt trigger, the second schmitt trigger, the first single-double input nand gate, and the second single-double input nand gate are all powered by the voltage output pin of the second low dropout regulator.
As a further improvement of the present invention, the power transformer circuit includes a winding ratio of 1:1, two end pins of a primary side of the second transformer are respectively and electrically connected with drain electrodes of the first high-frequency field effect tube and the second high-frequency field effect tube;
the input isolation power supply circuit is electrically connected with two end pins of the secondary side of the second transformer, and performs negative half-wave signal cut-off through a diode to form a reference modulation reference signal.
As a further improvement of the present invention, the power transformer circuit includes a first pi-type filter circuit, a second pi-type filter circuit, a first inductor, a first capacitor, and a second capacitor; two terminal pins of the primary side of the second transformer are electrically connected with the drain electrodes of the first high-frequency field-effect tube and the second high-frequency field-effect tube through a first pi-type filter circuit and a second pi-type filter circuit respectively; the first inductor is connected between a low-voltage power supply terminal and a middle tap of a primary side of the second transformer, and two ends of the first inductor are respectively connected with reference ground through the first capacitor and the second capacitor;
the input isolation power supply circuit comprises a third capacitor, a second inductor, a third inductor and a rectifier bridge consisting of four diodes; the positive polarity output end of the rectifier bridge is electrically connected with one end of a second inductor, and a high-voltage power supply negative terminal is formed at the other end of the second inductor; a middle tap of a secondary side of the second transformer is electrically connected with a negative polarity output end of the rectifier bridge through a third capacitor, the negative polarity output end of the rectifier bridge is electrically connected with one end of a third inductor, and a high-voltage power supply positive terminal is formed at the other end of the third inductor; two end pins of the secondary side of the second transformer are respectively and electrically connected with two alternating voltage input ends of the rectifier bridge, and a reference modulation reference signal is formed by the alternating voltage input end connected with the positive end pin of the secondary side of the second transformer.
As a further improvement of the present invention, the filter circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first filter capacitor, a second filter capacitor, a third filter capacitor, a first operational amplifier, a second operational amplifier, and a first transient voltage suppressor;
the middle tap on the secondary side of the first transformer is electrically connected with the inverting input end of the first operational amplifier through a first resistor, a first filter capacitor and a third resistor; the connection point of the first resistor and the first filter capacitor is electrically connected with the positive-phase input end of the second operational amplifier through a second resistor; the second filter capacitor is connected between the output end of the first operational amplifier and the connection point of the first resistor and the second resistor; the fourth resistor is connected between the connecting point of the first filter capacitor and the second resistor and the output end of the first operational amplifier; the positive phase input end of the first operational amplifier is connected with reference ground through a fifth resistor; the sixth resistor is connected between the output end of the second operational amplifier and the output end of the direct current signal isolation module, and the output end of the direct current signal isolation module is connected with the reference ground through a third filter capacitor and a first transient voltage suppressor which are connected in parallel.
As a further improvement of the present invention, an input signal port circuit is integrated on the printed circuit board, and the input signal port circuit includes a second transient voltage suppressor, a first current limiting resistor, a fourth filter capacitor, a fifth filter capacitor, a magnetic bead, a third operational amplifier, a seventh resistor, and a fourth operational amplifier;
two ends of the second transient voltage suppressor are respectively connected with a positive input terminal and a negative input terminal of an input signal port circuit, and the positive input terminal is connected to a positive-phase input end of the third operational amplifier through a first current-limiting resistor and a magnetic bead; the connection point of the first current-limiting resistor and the magnetic bead is connected with the negative input terminal through a fourth filter capacitor, and the positive-phase input end of the third operational amplifier is connected with the negative input terminal through the fifth filter capacitor; the output end of the third operational amplifier is connected with the non-inverting input end of the fourth operational amplifier through a seventh resistor, and a signal is output to the modulation circuit at the output end of the fourth operational amplifier.
As a further improvement of the present invention, a power port circuit is integrated on the printed circuit board, and the power port circuit includes a third transient voltage suppressor, a fourth transient voltage suppressor, a first anti-reverse diode and a second anti-reverse diode, a second current limiting resistor and a third current limiting resistor;
the power supply oscillation circuit is connected with a positive terminal of a direct current input interface through a second current-limiting resistor and a first reverse diode which is reversely connected, and the positive terminal of the direct current input interface is grounded through a third transient voltage suppressor; the power supply oscillation circuit is further connected with a negative wiring terminal of the direct current input interface through a third current-limiting resistor and a positive third anti-reverse diode, and the negative wiring terminal of the direct current input interface is grounded through a fourth transient voltage suppressor.
As a further improvement of the present invention, the size of the printed circuit board is 32mm long × 23mm wide × 18mm high, the printed circuit board includes a top layer, a first reference ground layer, a power supply layer, an internal electrical layer, a second reference ground layer, and a bottom layer, which are sequentially stacked, wherein the first reference ground layer and the second reference ground layer are interconnected through a plurality of via holes, and the top layer and the bottom layer are routed through layer-changing stub lines to provide a signal return path.
The invention has the following beneficial effects: the input detection signal is chopped and restored through the first analog switch chip and the second analog switch chip which are connected to the primary side and the secondary side of the signal transformer respectively according to the reference modulation reference signal and the reference demodulation reference signal which are generated by the power supply oscillating circuit, the power supply transformer circuit and the input isolation power supply circuit, so that direct-current signal isolation can be realized on a small printed circuit board by using electronic components with relatively low requirements on service performance, the cost is reduced, the direct-current signal isolation can be realized by completely using domestic electronic components, and the instability of material supply is avoided.
Drawings
Fig. 1 is a schematic diagram of a dc signal isolation module applied to a large current detection device of an onboard power supply according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a modulation circuit, a signal transformer circuit and a demodulation circuit in a dc signal isolation module applied to an onboard power supply large current detection device according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a power supply oscillation circuit applied to a dc signal isolation module of an onboard power supply large current detection device according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an input isolation power circuit applied to a dc signal isolation module of an onboard power supply large current detection device according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a filter circuit in a DC signal isolation module applied to a large current detection device of an onboard power supply according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an input signal port circuit in a DC signal isolation module applied to a large current detection device of an onboard power supply according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a part of power supply voltage conversion applied to an input signal port circuit in a large current detection device of an onboard power supply according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a power port circuit in a dc signal isolation module applied to an onboard power supply large current detection device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to meet the requirements of corresponding functions and performances of the dc signal isolation module (that is, to meet bidirectional dc input signal detection, wide-range working temperature, high precision, high linearity, low temperature drift, and the like), and to avoid the risk of unstable supply of all electronic components (that is, all electronic components can only use domestic components), referring to fig. 1, the dc signal isolation module applied to the onboard power supply large current detection device according to the embodiment of the present invention includes a printed circuit board mounted on a main circuit board in a pin-inserting manner, and a power supply oscillation circuit 11, a power supply transformer circuit 12, an input isolation power supply circuit 13, a modulation circuit 14, a signal transformer circuit 15, a demodulation circuit 16, and a filter circuit 17 are integrated on the printed circuit board.
Specifically, the power oscillator circuit 11 is connected to the dc input interface to obtain ± 12V power, and the power oscillator circuit 11 can be used to generate the reference demodulation reference signal. The power transformer circuit 12 and the input isolation power circuit 13 are electrically connected to the power oscillation circuit 11 in sequence, and convert the reference demodulation reference signal generated by the power oscillation circuit 11 into a reference modulation reference signal.
Referring to fig. 2, the modulation circuit 14 of the present embodiment includes a first analog switch chip N1, and the first analog switch chip N1 is electrically connected to the primary side of the signal transformer circuit 15, and together with the signal transformer circuit 15, chops the detection signal from the signal input interface into square pulses according to the reference modulation reference signal from the input isolation power circuit 13; the demodulation circuit 16 includes a second analog switch chip N2, and the second analog switch chip N2 is electrically connected to the secondary side of the signal transformer circuit 15, and together with the signal transformer circuit 15, restores the square wave pulse to a direct current signal according to the reference demodulation reference signal from the power supply oscillation circuit 11; the filter circuit 17 is electrically connected to the secondary side of the signal transformer circuit 15, and filters and outputs the dc signal.
The direct current signal isolation module chops and restores detection signals from input according to a reference modulation reference signal and a reference demodulation reference signal generated by the power supply oscillation circuit 11, the power supply transformer circuit 12 and the input isolation power supply circuit 13 respectively through the first analog switch chip N1 and the second analog switch chip N2 which are connected to the primary side and the secondary side of the signal transformer circuit 15, so that direct current signal isolation can be realized on a smaller printed circuit board by using electronic components with relatively lower performance requirements, the cost is reduced, domestic electronic components can be completely used, and unstable supply is avoided.
In one embodiment of the present invention, in order to satisfy the small-sized PCB space (PCB single board with length of 30mm × width of 21 mm) required by the pin-type mounting structure, the above-mentioned printed circuit board may adopt 6-layer boards on which electronic components are laid out on both sides. Specifically, the printed circuit board includes a TOP, a first reference ground layer GND, a POWER layer POWER, an internal electrical layer S1, a second reference ground layer AGND, and a BOTTOM layer BOTTOM, which are sequentially stacked, wherein the first reference ground layer GND and the second reference ground layer GND2 are ground plane layers (the input signal side is AGND network, and the output signal/working POWER side is GND network) without any trace splitting, and the first reference ground layer GND and the second reference ground layer GND2 are interconnected by dense ground vias, and traces of the TOP and the BOTTOM layer BOTTOM are respectively referenced to the first reference ground layer GND and the second reference ground layer GND2 to provide a complete signal return path for TOP and BOTTOM layer BOTTOM via-change stub lines, thereby effectively reducing the loop area of high-change rate dv/dt and di/dt signals. Meanwhile, the wires are realized in the TOP TOP and the BOTTOM BOTTOM as much as possible, and the peripheries of the wires are surrounded by land network copper and the wires in the TOP TOP and the BOTTOM BOTTOM; the number of routing of the inner electric layer S1 is reduced as much as possible, and other blank areas are covered with copper ground networks; the middle of the POWER layer POWER is covered with a copper POWER network, and the surrounding blank area is still covered with a copper ground network. Through the structure, the direct current signal isolation module is convenient to realize higher EMC performance requirements on a board level on the basis of meeting the functional indexes of the direct current signal isolation module.
As shown in fig. 2, in the dc signal isolation module, the signal transformer circuit 15 includes a first transformer T1, the detection signal from the signal input interface is input from the middle tap of the primary side of the first transformer T1, and the corresponding dc signal is output from the middle tap of the secondary side of the first transformer T1.
The first analog switch chip N1 includes a first signal input terminal (corresponding to the IN1 pin of the first analog switch chip N1) and two first signal output terminals (corresponding to the NC1 and NO1 pins of the first analog switch chip N1), and the reference modulation reference signal is input from the first signal input terminal, the two first signal output terminals are electrically connected to the two terminal pins at the primary side of the first transformer T1, respectively; the second analog switch chip N2 includes a second signal input terminal (corresponding to the IN1 pin of the second analog switch chip N2) 1 from which the reference demodulation reference signal is input, and two second signal output terminals (corresponding to the NC1 and NO1 pins of the second analog switch chip N2) electrically connected to the two terminal pins on the secondary side of the first transformer T1, respectively. The first analog switch chip N1 and the second analog switch chip N2 may be SGM3711YTQA 16G/TR (TQFN-2.6 × 1.8-16L package) of Santa Pont microelectronics (Beijing) Inc.
In order to meet the requirements of high precision and high linearity under a bidirectional direct current input signal, a square wave with a duty ratio strictly 1:1 is adopted for signal modulation and demodulation theoretically, otherwise, positive and negative direct current signals demodulated from the bidirectional signal have certain symmetry deviation, and the overall design precision and linearity of a module are influenced. In one embodiment of the present invention, as shown in fig. 3, the power oscillation circuit 11 includes a first schmitt trigger U5, a second schmitt trigger U6, a first single-double input nand gate U8, a second single-double input nand gate U7, a first high frequency fet Q1, and a second high frequency fet Q2, wherein: the second channel output pin (corresponding to the 2Y pin of the first schmitt trigger U5) of the first schmitt trigger U5 is electrically connected with the first channel input pin (corresponding to the 1A pin of the second schmitt trigger U6) of the second schmitt trigger U6; a second channel output pin (corresponding to a 2Y pin of the second Schmitt trigger U6) of the second Schmitt trigger U6 is electrically connected with the input end of the first single-double input NAND gate U8, and a first channel output pin (corresponding to a 1Y pin of the second Schmitt trigger U6) of the second Schmitt trigger U6 is electrically connected with the input end of the second single-double input NAND gate U7; the output end of the first single-double input NAND gate U8 is electrically connected with the gate of the first high-frequency field effect transistor Q1, and a reference demodulation reference signal K1 is formed at the drain of the first high-frequency field effect transistor Q1; the output end of the second single-double input nand gate U7 is electrically connected with the gate of the second high-frequency field effect transistor Q2, and a signal K2 which has the same amplitude as the reference demodulation reference signal and is opposite in phase is formed at the drain of the second high-frequency field effect transistor Q2.
Compared with the traditional oscillator circuit which adopts a monostable multivibrator CD4047 (American TI company/MSOP 14 package), a high-frequency NPN triode/PNP triode and the least peripheral resistance-capacitance elements to drive the square wave signal of the transformer, because the current domestic CD4000 series chip with mature technology only has DIP package and cannot be applied to a small-sized PCB single board, the power supply oscillation circuit 11 realizes the power supply oscillator function through a first Schmidt trigger U5, a second Schmidt trigger U6, a first single-double input NAND gate U8, a second single-double input NAND gate U7, a first high-frequency field effect tube Q1, a second high-frequency field effect tube Q2 and peripheral circuits thereof according to the packaging level of the current domestic logic circuit, and reduces the hardware requirement on electronic components. Specifically, the first schmitt trigger U5 and the second schmitt trigger U6 can be AiP74LV c2g14gc.tr (tin-free microarc electronics ltd/SOT 363 package); the first single-double input NAND gate U8 and the second single-double input NAND gate U7 can select SGM7SZ08YC5G/TR (Saint Pamp microelectronics (Beijing) GmbH/SOT 353 package), and the first high-frequency field effect tube Q1 and the second high-frequency field effect tube Q2 can select CJ2306 (Jiangsu Chang electronic technology GmbH/SOT 23 package); shaping driving is achieved through a minimum number of MLCC multilayer ceramic capacitors (Guangdong Fengkong electronic Limited company/0402 packaging) and high-precision low-temperature drift thin film resistors (Guangdong Fengkong electronic Limited company/0402 packaging) on the periphery to obtain two 1:1 square wave signals K1 and K2 which are regular and opposite in phase, the typical value of oscillation frequency generated by a resistor R39 and a capacitor C37 is about 40KHz, and capacitors CT1, CT2, C43 and C30 are pF-level filter capacitors aiming at high dv/dt high-voltage change rate signals, and the value range is 22 pF-100 pF.
The power supply of the first schmitt trigger U5 and the second schmitt trigger U6 is typically 3.3V, and is realized by the step-down of a dc input interface through an LDO (low dropout linear regulator). Specifically, to implement voltage reduction, the power oscillation circuit 11 further includes a first low dropout regulator and a second low dropout regulator, and a voltage input pin of the first low dropout regulator is electrically connected to a positive voltage pin + E (+12V) of the dc input interface, and converts the +12V dc voltage into +5V dc voltage for output, and a voltage output pin of the first low dropout regulator is electrically connected to a voltage input pin of the second low dropout regulator, and the second low dropout regulator converts the +5V dc voltage into +3.3V dc voltage for output. The first schmitt trigger U5, the second schmitt trigger U6, the first single-double input nand gate U8, and the second single-double input nand gate U7 are all powered by the voltage output pin of the second low dropout linear regulator. Specifically, the first low dropout linear regulator may specifically employ SGM2033-3.3XN5G/TR (SOT89 package) of saint nation microelectronics (beijing) gmbh, which may step down a 12V dc voltage to 5V; the second low dropout linear regulator may employ SGM2033-3.3XN5G/TR (SOT23-5 package) from Santa Clan microelectronics (Beijing) Inc., which may step down a 5V DC voltage to 3.3V. Through the structure, the square wave signals K1 and K2 with the duty ratio of 1:1 can be formed at the drains of the first high-frequency field effect transistor Q1 and the second high-frequency field effect transistor Q2, and the two square wave signals K1 and K2 are high dv/dt signals with the same amplitude and opposite phases.
In one embodiment of the invention, as shown in fig. 4, the power transformer circuit includes a 1:1, two terminal pins of a primary side of the second transformer T2 are electrically connected with drains of the first high-frequency field effect transistor Q1 and the second high-frequency field effect transistor Q2 respectively. The input isolation power circuit 13 is electrically connected with two terminal pins of the secondary side of the second transformer T2, and cuts off the negative half-wave signal through a diode to form a reference modulation reference signal.
Specifically, the power transformer circuit 12 includes a first pi-type filter circuit composed of capacitors CT11, CT10 and magnetic bead BT1, a second pi-type filter circuit composed of capacitors CT12, CT113 and magnetic bead BT2, a first inductor LT1, a first capacitor C24 and a second capacitor CT 3; two terminal pins of the primary side of the second transformer T2 are electrically connected with the drains of the first high-frequency field-effect tube Q1 and the second high-frequency field-effect tube Q2 through a first pi-type filter circuit and a second pi-type filter circuit respectively; the first inductor LT1 is connected between the low voltage supply terminal (5V) and the middle tap of the primary side of the second transformer T2, and both ends of the first inductor LT1 are connected to the ground GND via the first capacitor C24 and the second capacitor CT3, respectively.
In the above circuit, the isolation withstand voltage of the second transformer T2 is DC2 KV. The first pi-type filter circuit and the second pi-type filter circuit can realize EMI suppression. The first inductor LT1 can be a chip ferrite inductor (1 uH, 0603 package) of guangdong feng hua bang co electronics ltd, and the first capacitor C24 and the second capacitor CT3 can be MLCC multilayer ceramic capacitors (2.2 uF,0402 package) of guangdong feng hua bang co electronics ltd for filtering; the magnetic beads BT1 and BT2 can be peak type paster magnetic beads (100 omega/100 MHz, 0603 packaging) of Guangdong Fenghua high and new technology GmbH, and the capacitors CT 10-CT 13 can be MLCC multilayer ceramic capacitors (22 pF, 0402 packaging) of Guangdong Fenghua high and new technology GmbH.
The input isolation power supply circuit 13 comprises a third capacitor C25, a second inductor LT3, a third inductor LT2, and a rectifier bridge consisting of four diodes, wherein the positive polarity output end of the rectifier bridge is electrically connected with one end of the second inductor LT3, and a high voltage power supply negative terminal-VCC electrical connection is formed at the other end of the second inductor LT 3; the middle tap of the secondary side of the second transformer T2 is electrically connected to the negative polarity output terminal of the rectifier bridge via the third capacitor C25, and the negative polarity output terminal of the rectifier bridge is also electrically connected to one end of the third inductor LT2, and a high voltage supply positive terminal VCC is electrically connected to the other end of the third inductor LT 2; two terminal pins of the secondary side of the second transformer T2 are electrically connected to two ac voltage input terminals of the rectifier bridge, respectively, and a reference modulation reference signal is formed by an ac voltage input terminal connected to a positive terminal pin of the secondary side of the second transformer T2. The rectifier bridge may be implemented by using a schottky diode array BAV99 (SOT23 package, shochu electrical technologies).
In order to obtain a lower dc ripple peak-to-peak value or effective value with a minimum response delay time for the demodulated pulsating dc voltage waveform, as shown in fig. 5, in an embodiment of the present invention, the filter circuit 17 includes a first resistor R1, a second resistor R2, a third resistor R9, a fourth resistor R5, a fifth resistor R14, a sixth resistor R4, a first filter capacitor C2, a second filter capacitor C3, a third filter capacitor C38, a first operational amplifier U2A, a second operational amplifier U2B, and a first transient voltage suppressor F2; the middle tap of the secondary side of the first transformer T1 is electrically connected to the inverting input terminal of the first operational amplifier U2A through a first resistor R1, a first filter capacitor C2 and a third resistor R9; the connection point of the first resistor R1 and the first filter capacitor C2 is electrically connected with the non-inverting input end of the second operational amplifier U2B through a second resistor R2; the second filter capacitor C3 is connected between the output end of the first operational amplifier U2A and the connection point of the first resistor R1 and the second resistor R2; the fourth resistor R5 is connected between the connection point of the first filter capacitor C2 and the second resistor R9 and the output end of the first operational amplifier U2A; the non-inverting input terminal of the first operational amplifier U2A is connected to the ground GND via a fifth resistor R14; the sixth resistor R4 is connected between the output terminal of the second operational amplifier U2B and the output terminal Vo of the dc signal isolation module, and the output terminal Vo of the dc signal isolation module is connected to the ground GND via the third filter capacitor C38 and the first transient voltage suppressor F2 in parallel.
In the filter circuit 17, the first operational amplifier U2A and the second operational amplifier U2B are precision dual-path operational amplifiers (188tpa 2, MSOP8 package) of the california microelectronics technologies (suzhou), ultra-low offset (maximum offset voltage Vos =15 uV), ultra-low temperature drift (typical offset voltage vosstc =0.05 uV/c), ultra-high voltage swing (12V/us), and high power supply voltage, wherein one path is used to construct an infinite gain filter. Wherein, the first filter capacitor C2 and the second filter capacitor C3 are 2.2nF multilayer ceramic capacitors (0402 package) made of G0G, and the third filter capacitor C35 is 10nF multilayer ceramic capacitors (0402 package) made of G0G. The resistors are all high-precision (0.5%) and low-temperature drift (+ -25 ppm/DEG C) thin film resistors (0402 packaging) of Guangdong Fenghua Bonder electronics Co.
The first transient voltage suppressor F2 is a common junction capacitor type bipolar device (maximum no-action voltage Vrwm =12V, junction capacitance Cj =100pF, power P =320W (8/20 us wave)). The sixth resistor R4 is an HTS series surge-resistant resistor (20 Ω, (1/16W) W, 0402 package) of ahi hong kun high technology limited, which can significantly reduce the higher residual voltage of the 12V first transient voltage suppressor F2. The third filter capacitor C38 (0.01 uF,0402 package) is used to further smooth the transient residual voltage, so as to ensure that the second operational amplifier U2B is not damaged by the transient impact energy pulse, and the response time of the module is not significantly affected.
In one embodiment of the present invention, as shown in fig. 6, an input signal port circuit is further integrated on the printed circuit board, and the input signal port circuit includes a second transient voltage suppressor F1, a first current limiting resistor R6, a fourth filter capacitor C9, a fifth filter capacitor C5, a magnetic bead BT7, a third operational amplifier U1A, a seventh resistor R7, and a fourth operational amplifier U1B. The two ends of the second transient voltage suppressor F1 are respectively connected to the positive input terminal Vin + and the negative input terminal Vin-of the input signal port circuit, and the positive input terminal Vin + is connected to the non-inverting input terminal of the third operational amplifier U1A via the first current limiting resistor R6 and the magnetic bead BT 7; the connection point of the first current limiting resistor R6 and the magnetic bead BT7 is connected with a negative input terminal Vin-through a fourth filter capacitor C9, and the non-inverting input end of the third operational amplifier U1A is connected with the negative input terminal Vin-through a fifth filter capacitor C5; the output terminal of the third operational amplifier U1A is connected to the non-inverting input terminal of the fourth operational amplifier U1B via a seventh resistor R7, and outputs a signal (i.e., a processed detection signal) to the modulation circuit 14 at the output terminal of the fourth operational amplifier U1B.
The third operational amplifier U1A and the fourth operational amplifier U1B may be a precision, ultra-low offset, ultra-low temperature drift, high power supply voltage dual-path operational amplifier (TPA 1882, MSOP8 package) of the sripu microelectronics technologies (suzhou), which may be powered by positive and negative dual power VCC/VCC voltages formed by rectifying the output voltage of the rectifier bridge of the second transformer T2 through a multilayer ceramic capacitor and a ferrite inductor, respectively. Considering the influence of VCC/-VCC on EMI due to the change of reverse high di/dt recovery current of the rectifier bridge, power supply EMI filtering is still performed by adopting a pi-type filter circuit consisting of ferrite inductors (namely LT2 and LT 3) and MLCC multilayer ceramic capacitors (CT 4, CT5, C25 and C26).
The second transient voltage suppressor F1 can be selected from a common junction capacitor type bipolar device (maximum no-action voltage Vrwm =5V, junction capacitance Cj =200pF, power P =320W (8/20 us wave)); the first current limiting resistor R6 is a domestic high-precision low-temperature drift thin film resistor (10K Ω, (1/16W), 0402 package), which can greatly reduce the transient impact current that can not be completely absorbed by the second transient voltage suppressor F1 and continues to be injected into the input pin of the third operational amplifier U1A; the first current limiting resistor R6 and the fourth filter capacitor C9 (0.1 uF,0402 package), the fifth filter capacitor C5 (1 nF,0402 package) and the common magnetic bead BT7 (600 omega/100 MHz, 0603 package) are matched, so that the wide-frequency range filtering from low, medium frequency to high frequency can be realized.
Referring to fig. 7, input small signals DC-100mV to +100mV are subjected to protection filtering and then directly sent to an input stage operational amplifier for amplification, and although the third operational amplifier U1A and the fourth operational amplifier U1B are dual operational amplifiers of the company limited to the microelectronics technologies of selinum, the imbalance of the operational amplifiers accounts for a very low signal proportion and can be completely ignored for the accuracy requirement of 1 permillage of the module, the imbalance voltage temperature drift of the operational amplifiers has a certain influence on the maximum 35 ppm/DEG C within the full temperature working range of-40 ℃ to 85 ℃. Therefore, on the basis of adopting a standard ME431AXG (SOT23 package) of domestic ultra-low temperature drift (maximum 20 ppm/DEG C), a standard voltage +2.5V is converted into-2.5V by using a precision and ultra-low offset (maximum offset voltage Vos =15 uV) and ultra-low temperature drift (typical offset voltage temperature drift VosTC =0.05 uV/DEG C) single-path operational amplifier U3 (TPA 1881, SOT23-5 package) of high power supply voltage of Sirah microelectronic technology GmbH, and then a zero-setting circuit of a module is realized between reference voltages of +/-2.5V by adopting a domestic patch micro multi-loop potentiometer VR1 (Shaanxi Macro electric appliance GmbH, 3224G package), and the resistance of the potentiometer accounts for not more than 8 percent (the actual potentiometer VR1 takes a value of 2K, and R11= R18=12K Ω). Through the mode, the influence of the zero setting circuit on the temperature drift of the direct-current signal isolation module can be reduced to the greatest extent.
In an embodiment of the present invention, as shown in fig. 8, a power port circuit is further integrated on the printed circuit board, and the power port circuit includes a third transient voltage suppressor F5, a fourth transient voltage suppressor F6, a first anti-reverse diode D2, a second anti-reverse diode D4, a second current limiting resistor RT1, and a third current limiting resistor RT 2; the power supply oscillation circuit 11 is connected with a positive terminal + E of the dc input interface through a second current-limiting resistor RT1 and a first reverse diode D2, and the positive terminal + E of the dc input interface is grounded through a third transient voltage suppressor F5; the power oscillation circuit 11 is further connected to the negative connection terminal-E of the dc input interface via a third current limiting resistor RT2 and a third forward diode D4, and the negative connection terminal-E of the dc input interface is grounded via a fourth transient voltage suppressor F6.
Specifically, in the power port circuit, the third transient voltage suppressor F5 and the fourth transient voltage suppressor F6 may be implemented by common junction capacitor type bipolar devices (maximum operating voltage Vrwm =15V, junction capacitance Cj =75pF, power P =320W (8/20 us wave)); the first anti-reverse diode D2 and the second anti-reverse diode D4 adopt a domestic schottky diode 1N4448WS (SOD 323 package, Jiangsu Changtong electrical technology corporation), which can not damage the module under the condition of power supply false reverse connection, and can also prevent the negative/positive residual voltage of the third transient voltage suppressor F5 and the fourth transient voltage suppressor F6 to the negative polarity EOS (SURGE SURGE and electrostatic discharge ESD) from entering the positive/negative power supply pin of the operational amplifier; the second current limiting resistor RT1 and the third current limiting resistor RT2 are anti-surge resistors (10 omega, 0.25W, 0603 packaging) of Guangdong Fenghuapo electronic Limited, which can obviously reduce the higher residual voltage of the third transient voltage suppressor F5 and the fourth transient voltage suppressor F6 of 15V. The filtering MLCC capacitors CT26 and CT27 are used for further smoothing the transient residual voltage, and soft and hard damage to a rear-stage operational amplifier chip can be avoided under transient impact energy pulses.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A direct current signal isolation module applied to an airborne power supply large current detection device comprises a printed circuit board which is arranged on a main circuit board in a pin inserting mode, and is characterized in that a power supply oscillation circuit, a power supply transformer circuit, an input isolation power supply circuit, a modulation circuit, a signal transformer circuit, a demodulation circuit and a filter circuit are integrated on the printed circuit board; wherein:
the power supply oscillating circuit is connected with the direct current input interface and is used for generating a reference demodulation reference signal; the power transformer circuit and the input isolation power circuit are sequentially electrically connected with the power oscillation circuit and convert a reference demodulation reference signal generated by the power oscillation circuit into a reference modulation reference signal;
the modulation circuit comprises a first analog switch chip, the first analog switch chip is electrically connected with the primary side of the signal transformer circuit and is used together with the signal transformer circuit to chop a detection signal from the signal input interface into square wave pulses according to a reference modulation reference signal from the input isolation power supply circuit; the demodulation circuit comprises a second analog switch chip, the second analog switch chip is electrically connected with the secondary side of the signal transformer circuit and is used for reducing the square wave pulse into a direct current signal together with the signal transformer circuit according to a reference demodulation reference signal from the power supply oscillation circuit;
and the filter circuit is electrically connected with the secondary side of the signal transformer circuit and outputs the direct current signal after filtering.
2. The dc signal isolation module of claim 1, wherein the signal transformer circuit comprises a first transformer, the detection signal from the signal input interface is input by a middle tap on a primary side of the first transformer, and the dc signal is output by a middle tap on a secondary side of the first transformer;
the first analog switch chip comprises a first signal input terminal and two first signal output terminals, the reference modulation reference signal is input by the first signal input terminal, and the two first signal output terminals are respectively and electrically connected with two end pins on the primary side of the first transformer; the second analog switch chip comprises a second signal input terminal and two second signal output terminals, the reference demodulation reference signal is input by the second signal input terminal, and the two second signal output terminals are respectively and electrically connected with two end pins on the secondary side of the first transformer.
3. The dc signal isolation module of claim 1, wherein the power supply oscillating circuit comprises a first schmitt trigger, a second schmitt trigger, a first single-double input nand gate, a second single-double input nand gate, a first high frequency fet, and a second high frequency fet, wherein:
a second channel output pin of the first Schmitt trigger is electrically connected with a first channel input pin of the second Schmitt trigger; a second channel output pin of the second Schmitt trigger is electrically connected with the input end of the first single-double input NAND gate, and a first channel output pin of the second Schmitt trigger is electrically connected with the input end of the second single-double input NAND gate; the output end of the first single-double input NAND gate is electrically connected with the grid electrode of the first high-frequency field effect transistor, and the reference demodulation reference signal is formed on the drain electrode of the first high-frequency field effect transistor; the output end of the second single-double input NAND gate is electrically connected with the grid of the second high-frequency field effect transistor, and a signal which has the same amplitude as the reference demodulation reference signal and is opposite in phase is formed on the drain of the second high-frequency field effect transistor.
4. The DC signal isolation module of claim 3, wherein the power supply oscillating circuit comprises a first low dropout regulator and a second low dropout regulator, and a voltage input pin of the first low dropout regulator is electrically connected to a positive voltage pin of the DC input interface, a voltage output pin of the first low dropout regulator is electrically connected to a voltage input pin of the second low dropout regulator, and the first Schmitt trigger, the second Schmitt trigger, the first single-double input NAND gate, and the second single-double input NAND gate are all powered through the voltage output pin of the second low dropout regulator.
5. The DC signal isolation module of claim 3, wherein the power transformer circuit comprises a 1:1, two end pins of a primary side of the second transformer are respectively and electrically connected with drain electrodes of the first high-frequency field effect tube and the second high-frequency field effect tube;
the input isolation power supply circuit is electrically connected with two end pins of the secondary side of the second transformer, and performs negative half-wave signal cut-off through a diode to form a reference modulation reference signal.
6. The DC signal isolation module of claim 5, wherein the power transformer circuit comprises a first pi filter circuit, a second pi filter circuit, a first inductor, a first capacitor, and a second capacitor; two terminal pins of the primary side of the second transformer are electrically connected with the drain electrodes of the first high-frequency field-effect tube and the second high-frequency field-effect tube through a first pi-type filter circuit and a second pi-type filter circuit respectively; the first inductor is connected between a low-voltage power supply terminal and a middle tap of a primary side of the second transformer, and two ends of the first inductor are respectively connected with reference ground through the first capacitor and the second capacitor;
the input isolation power supply circuit comprises a third capacitor, a second inductor, a third inductor and a rectifier bridge consisting of four diodes; the positive polarity output end of the rectifier bridge is electrically connected with one end of a second inductor, and a high-voltage power supply negative terminal is formed at the other end of the second inductor; a middle tap of a secondary side of the second transformer is electrically connected with a negative polarity output end of the rectifier bridge through a third capacitor, the negative polarity output end of the rectifier bridge is electrically connected with one end of a third inductor, and a high-voltage power supply positive terminal is formed at the other end of the third inductor; two end pins of the secondary side of the second transformer are respectively and electrically connected with two alternating voltage input ends of the rectifier bridge, and a reference modulation reference signal is formed by the alternating voltage input end connected with the positive end pin of the secondary side of the second transformer.
7. The direct current signal isolation module of claim 2, wherein the filter circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first filter capacitor, a second filter capacitor, a third filter capacitor, a first operational amplifier, a second operational amplifier, and a first transient voltage suppressor;
the middle tap on the secondary side of the first transformer is electrically connected with the inverting input end of the first operational amplifier through a first resistor, a first filter capacitor and a third resistor; the connection point of the first resistor and the first filter capacitor is electrically connected with the positive-phase input end of the second operational amplifier through a second resistor; the second filter capacitor is connected between the output end of the first operational amplifier and the connection point of the first resistor and the second resistor; the fourth resistor is connected between the connecting point of the first filter capacitor and the second resistor and the output end of the first operational amplifier; the positive phase input end of the first operational amplifier is connected with reference ground through a fifth resistor; the sixth resistor is connected between the output end of the second operational amplifier and the output end of the direct-current signal isolation module, and the output end of the direct-current signal isolation module is connected with the reference ground through the third filter capacitor and the first transient voltage suppressor which are connected in parallel.
8. The direct current signal isolation module of claim 1, wherein an input signal port circuit is integrated on the printed circuit board, and the input signal port circuit comprises a second transient voltage suppressor, a first current limiting resistor, a fourth filter capacitor, a fifth filter capacitor, a magnetic bead, a third operational amplifier, a seventh resistor, and a fourth operational amplifier;
two ends of the second transient voltage suppressor are respectively connected with a positive input terminal and a negative input terminal of an input signal port circuit, and the positive input terminal is connected to a positive-phase input end of the third operational amplifier through a first current-limiting resistor and a magnetic bead; the connection point of the first current-limiting resistor and the magnetic bead is connected with the negative input terminal through a fourth filter capacitor, and the positive-phase input end of the third operational amplifier is connected with the negative input terminal through the fifth filter capacitor; the output end of the third operational amplifier is connected with the non-inverting input end of the fourth operational amplifier through a seventh resistor, and a signal is output to the modulation circuit at the output end of the fourth operational amplifier.
9. The direct current signal isolation module of claim 1, wherein a power port circuit is integrated on the printed circuit board, and the power port circuit comprises a third transient voltage suppressor, a fourth transient voltage suppressor, a first anti-reverse diode and a second anti-reverse diode, a second current limiting resistor and a third current limiting resistor;
the power supply oscillation circuit is connected with a positive terminal of the direct current input interface through a second current-limiting resistor and a first reverse diode in reverse connection, and the positive terminal of the direct current input interface is grounded through a third transient voltage suppressor; the power supply oscillation circuit is further connected with a negative wiring terminal of the direct current input interface through a third current-limiting resistor and a positive third anti-reverse diode, and the negative wiring terminal of the direct current input interface is grounded through a fourth transient voltage suppressor.
10. The dc signal isolation module of any one of claims 1-9, wherein the printed circuit board has a dimension of 32mm long by 23mm wide by 18mm high, and comprises a top layer, a first reference ground layer, a power layer, an internal electrical layer, a second reference ground layer, and a bottom layer sequentially stacked, wherein the first reference ground layer and the second reference ground layer are interconnected by a plurality of vias, and the top layer and the bottom layer traces provide a signal return path through the layer-changing stub.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117748936A (en) * | 2024-02-19 | 2024-03-22 | 成都麦特斯科技有限公司 | Low-power consumption boost system |
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| CN103344813A (en) * | 2013-07-10 | 2013-10-09 | 深圳市航天新源科技有限公司 | Direct current voltage isolation sampling circuit |
| CN206348377U (en) * | 2016-12-28 | 2017-07-21 | 深圳圣斯尔电子技术有限公司 | A kind of high direct voltage isolating transmitter |
| CN110542774A (en) * | 2019-09-11 | 2019-12-06 | 深圳市航天新源科技有限公司 | Feedback type bidirectional current magnetic isolation sampling circuit |
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| US6885184B1 (en) * | 2004-03-31 | 2005-04-26 | Asco Power Technologies, L.P. | Galvanically isolated voltage sensing circuit |
| CN101867365A (en) * | 2010-04-28 | 2010-10-20 | 广州金升阳科技有限公司 | Circuit for converting direct-current positive and negative bipolar signal into unipolar signal through isolation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114966155B (en) | 2022-10-14 |
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