CN109946506B - Zero crossing detection system - Google Patents
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- CN109946506B CN109946506B CN201910305914.1A CN201910305914A CN109946506B CN 109946506 B CN109946506 B CN 109946506B CN 201910305914 A CN201910305914 A CN 201910305914A CN 109946506 B CN109946506 B CN 109946506B
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Abstract
The invention discloses a zero-crossing detection system, which comprises a zero-crossing signal sampling module, a power supply module and a direct-current filtering module; the zero-crossing signal sampling module comprises a lightning-stroke-resistant surge interference circuit and a transformer, the lightning-stroke-resistant surge interference circuit is respectively connected with an alternating-current live wire input end, an alternating-current zero-line input end and a primary winding of the transformer, the lightning-stroke-resistant surge interference circuit at least comprises a safety capacitor, the primary winding of the transformer and the safety capacitor form a first filter circuit, and the primary winding of the transformer is connected in series with an alternating-current power grid; the power module comprises a bridge pile, a clamping circuit, an adjusting transformer and a primary side feedback system, wherein the clamping circuit is connected with a second auxiliary winding of the adjusting transformer, a first auxiliary winding of the adjusting transformer is connected with the primary side feedback system, and a buffer circuit is arranged at the secondary side winding of the adjusting transformer and the output end of the direct current voltage. The invention can solve the problems of delay, poor sampling consistency and large loss of the sampling circuit.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a zero-crossing detection system.
Background
With the development of power line carrier communication, the requirements of people on carrier data synchronization are higher and higher, so that the requirements on the accuracy of zero detection of alternating current grid voltage are also continuously improved. The current limiting resistor is adopted at the input end of the current limiting circuit to limit the current flowing through the photoelectric coupler, and the zero crossing detection circuit is applied to a plurality of electronic devices.
The existing zero-crossing detection circuit is simple in principle, high-voltage signals are usually obtained by adopting resistor voltage division, or alternating-current input signals are sampled by adopting a mode of resistor-capacitor voltage reduction and resistor voltage division, and in addition, sampling circuits adopting LC oscillating circuits and non-isolation technology are used for detecting zero-crossing signals. However, the existing zero-crossing detection technical schemes also have the problems of delay of a sampling circuit, poor sampling consistency and large loss.
Disclosure of Invention
Therefore, the invention aims to provide a zero-crossing detection system to solve the problems of delay, poor sampling consistency and large loss of a sampling circuit.
A zero-crossing detection system comprises a zero-crossing signal sampling module, a power supply module and a direct current filtering module;
the zero-crossing signal sampling module comprises an anti-lightning surge interference circuit and a transformer, wherein the anti-lightning surge interference circuit is respectively connected with an alternating current live wire input end, an alternating current zero line input end and a primary winding of the transformer, the anti-lightning surge interference circuit at least comprises a safety capacitor, the primary winding of the transformer and the safety capacitor form a first filter circuit, and the primary winding of the transformer is connected in series with an alternating current power grid;
the power module comprises a bridge pile, a clamping circuit, an adjusting transformer and a primary side feedback system, wherein the bridge pile is respectively connected with the zero-crossing signal sampling module and the clamping circuit, the clamping circuit is connected with a second auxiliary winding of the adjusting transformer, a first auxiliary winding of the adjusting transformer is connected with the primary side feedback system, a secondary side winding of the adjusting transformer outputs direct-current voltage, and a buffer circuit for reducing ripple waves and noise is arranged at the secondary side winding and the direct-current voltage output end of the adjusting transformer;
the direct current filter module is connected with the direct current voltage output end.
According to the zero-crossing detection system provided by the invention, in the zero-crossing signal sampling module, the primary winding of the transformer and the safety capacitor form the first filter circuit, so that the interference of harmonic waves can be avoided, as the primary winding of the transformer is connected in series with the alternating current power grid, almost no loss exists, when the primary winding has alternating current signals to pass through, current changes, induction can be realized in the secondary winding, the delay of the sampling circuit is avoided, no matter the voltage AC of the input end of an alternating current live wire or the input end of an alternating current zero line is 85V or 265V or other values, as long as extremely small current flows through the transformer, signals larger than uV level can be obtained in the secondary winding of the transformer, the sampling consistency is good, in addition, in the power module, the primary side feedback system can supplement the low-power consumption effect in standby, and the buffer circuit can reduce ripple waves and noise, so that the reliable direct current voltage with low ripple waves and low noise is provided for the rear end.
In addition, the zero-crossing detection system according to the present invention may further have the following additional technical features:
further, the primary side feedback system comprises a rectifying circuit, a pi-type filter circuit, a phase compensation circuit, a feedback circuit and a control chip, wherein the rectifying circuit is connected with the first auxiliary winding of the regulating transformer, the pi-type filter circuit is respectively connected with the rectifying circuit and the control chip, the phase compensation circuit is connected between the pi-type filter circuit and the rectifying circuit, and the feedback circuit is respectively connected with the first auxiliary winding of the regulating transformer and the control chip.
Further, the direct current filter module comprises an active filter circuit, the active filter circuit comprises a tenth resistor, an eleventh capacitor, a twelfth capacitor and a second operational amplifier, a first end of the eleventh resistor is connected with the direct current voltage output end, a second end of the eleventh resistor is connected with the first end of the eleventh capacitor, a second end of the eleventh capacitor is connected with an inverting input end of the second operational amplifier, a non-inverting input end of the second operational amplifier is grounded, the tenth resistor is connected between the inverting input end of the second operational amplifier and an output end of the second operational amplifier, a first end of the twelfth capacitor is connected with the output end of the second operational amplifier, and a second end of the twelfth capacitor is respectively connected with the second end of the eleventh resistor and the first end of the eleventh capacitor.
Further, the zero crossing detection system further comprises a filtering amplification module, a secondary winding of the transformer is connected with a secondary induction signal end, and the filtering amplification module is connected with the secondary induction signal end.
Further, the filtering and amplifying module comprises a low-pass filter, a third operational amplifier, a fourth operational amplifier and an anti-clutter interference circuit, wherein the low-pass filter is connected with the non-inverting input end of the third operational amplifier, the output end of the third operational amplifier is connected with the non-inverting input end of the fourth operational amplifier, and the input end of the fourth operational amplifier is connected with the anti-clutter interference circuit.
Further, the anti-clutter interference circuit comprises a second triode, a third triode, a twenty-first resistor, a twenty-second resistor, a nineteenth capacitor and a twentieth capacitor, wherein the signal output by the fourth operational amplifier is subjected to isolation sampling of the second triode, and the twenty-first resistor, the twenty-second resistor, the nineteenth capacitor and the twentieth capacitor form a second-level pi-type filter for controlling the conduction of the third triode.
Further, the anti-lightning surge interference circuit further comprises a piezoresistor and a safety resistor, wherein the piezoresistor is connected between the alternating current live wire input end and the alternating current zero line input end, the safety resistor is connected between the alternating current live wire input end and the safety capacitor, the buffer circuit comprises a third capacitor and a second resistor, and the third capacitor and the second resistor are connected in series between the secondary winding of the regulating transformer and the direct current voltage output end.
Further, the power module further comprises a second filter circuit, the second filter circuit is connected with the bridge stack, the clamping circuit comprises a first resistor, a first capacitor and a first diode, the first resistor and the first capacitor are connected in parallel between the bridge stack and the cathode of the first diode, and the anode of the first diode is connected with the second auxiliary winding of the regulating transformer.
Further, the filtering and amplifying module further comprises a thirteenth capacitor, a seventeenth resistor, an eighteenth resistor, a seventeenth capacitor, a fourteenth capacitor and a nineteenth resistor, wherein the thirteenth capacitor is used as a decoupling capacitor of the third operational amplifier, the seventeenth resistor is used as a negative feedback resistor of the third operational amplifier, the eighteenth resistor and the seventeenth capacitor form a zero compensation circuit of the third operational amplifier, the fourteenth capacitor is used as the decoupling capacitor of the fourth operational amplifier, and the nineteenth resistor is used as the negative feedback resistor of the fourth operational amplifier.
Further, the magnetic core of the transformer adopts an amorphous nanometer magnetic ring, the diameter is 5.5mm, the inductance is 350uH, the winding adopts a 0.25mm composite material wire, the composite material wire comprises 95.5% of Sn, 3% of Ag and 1.5% of Cu, the primary winding and the secondary winding of the transformer are wound for 50 circles in the same phase, and the inductance of the coil is 5uH.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a logical block diagram of a zero crossing detection system according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a zero crossing signal sampling module and a power module;
fig. 3 is a schematic circuit diagram of a dc filter module;
fig. 4 is a schematic circuit diagram of a filtering and amplifying module.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. Several embodiments of the invention are presented in the figures. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," "upper," "lower," and the like are used herein for descriptive purposes only and not to indicate or imply that the apparatus or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 4, a zero crossing detection system according to an embodiment of the present invention includes a zero crossing signal sampling module 10, a power module 20, and a dc filtering module 30.
The zero-crossing signal sampling module 10 comprises an anti-lightning surge interference circuit 11 and a transformer L1, the anti-lightning surge interference circuit 11 is respectively connected with an alternating current live wire input end (L), an alternating current zero line input end (N) and a primary winding of the transformer L1, the anti-lightning surge interference circuit 11 at least comprises a safety capacitor C5, a first filter circuit is formed by the primary winding of the transformer L1 and the safety capacitor C5, and the primary winding of the transformer L1 is connected in series with an alternating current power grid. The primary winding of the transformer L1 and the safety capacitor group C5 form the first filter circuit, so that the interference of harmonic waves can be avoided, the primary winding of the transformer L1 is connected in series to an alternating current power grid, so that almost no loss exists, when an alternating current signal passes through the primary winding, the current changes, the secondary winding can sense, the secondary sensed signal is S_in, the delay of a sampling circuit is avoided, no matter the voltage AC of an alternating current live wire input end or an alternating current zero line input end is 85V or 265V or other values, a signal which is larger than uV level can be obtained in the secondary winding of the transformer as long as a tiny current flows through the transformer, and the sampling consistency is good.
It should be noted that, in implementation, the ac live input (L) and the ac neutral input (N) may be interchanged without affecting the workflow.
Specifically, in this embodiment, the anti-lightning surge interference circuit 11 further includes a varistor RV1 and a safety resistor FR1, where the varistor RV1 is connected between the ac live wire input end (L) and the ac neutral wire input end (N), and the safety resistor FR1 is connected between the ac live wire input end (L) and the safety capacitor C5.
In addition, the embodiment also improves the transformer L1, specifically, the magnetic core of the transformer L1 adopts an amorphous nano magnetic ring, the diameter is 5.5mm, the inductance is 350uH, the winding adopts a 0.25mm composite material wire, the composite material wire comprises 95.5% of Sn, 3% of Ag and 1.5% of Cu, the primary winding and the secondary winding of the transformer L1 are wound for 50 circles in the same phase, and the inductance of the coil is 5uH. The transformer designed in this way has small volume, high magnetic conductivity, high rectangular ratio and ideal high temperature stability.
The power module 20 comprises a bridge pile D3, a clamping circuit 21, an adjusting transformer T1 and a primary side feedback system 22, the bridge pile D3 is respectively connected with the zero-crossing signal sampling module 10 and the clamping circuit 21, the clamping circuit 21 is connected with a second auxiliary winding (i.e. 4-5 ends) of the adjusting transformer T1, a first auxiliary winding (i.e. 1-2 ends) of the adjusting transformer T1 is connected with the primary side feedback system 22, a secondary winding (i.e. 6-10 ends) of the adjusting transformer T1 outputs a direct current voltage, and a buffer circuit 23 for reducing ripple waves and noise is arranged at the secondary winding and the direct current voltage output end VDD of the adjusting transformer T1.
In the power module 20, the primary feedback system 22 can supplement the low power consumption effect in standby, and the buffer circuit 23 can reduce ripple and noise, so as to provide a reliable dc voltage with low ripple and low noise for the back end.
Specifically, the buffer circuit 23 includes a third capacitor C3 and a second resistor R2, where the third capacitor C3 and the second resistor R2 are connected in series between the secondary winding of the regulating transformer T1 and the dc voltage output terminal VDD.
In this embodiment, the power module 20 further includes a second filter circuit, the second filter circuit specifically employs a second capacitor C2, the second filter circuit is connected with the bridge pile D3, the clamping circuit 21 specifically includes a first resistor R1, a first capacitor C1 and a first diode D1, the first resistor R1 and the first capacitor C1 are connected in parallel between the bridge pile D3 and the cathode of the first diode D1, and the anode of the first diode D1 is connected with the second auxiliary winding of the regulating transformer T1.
The primary side feedback system 22 comprises a rectifying circuit 221, a pi-type filtering circuit 222, a phase compensation circuit 223, a feedback circuit 224 and a control chip U1, wherein the rectifying circuit 221 is connected with a first auxiliary winding of the regulating transformer T1, the pi-type filtering circuit 222 is respectively connected with the rectifying circuit 221 and the control chip U1, the phase compensation circuit 223 is connected between the pi-type filtering circuit 222 and the rectifying circuit 221, and the feedback circuit 224 is respectively connected with the first auxiliary winding of the regulating transformer T1 and the control chip U1.
Specifically, the rectifying circuit 221 is composed of a fourth diode D4 and a fifth resistor R5, the pi-type filtering circuit 222 is composed of an eighth resistor R8, a ninth capacitor C9, and a tenth capacitor C10, and is configured to provide a dc voltage to the control chip U1, to supplement the low power consumption effect during standby, the phase compensation circuit 223 is composed of a sixth resistor R6 and a seventh capacitor C7, and the feedback circuit 224 is composed of a seventh resistor R7 and a ninth resistor R9.
The power module 20 has the advantages of low cost, high calibration rate and low standby power consumption, and can provide reliable direct current voltage with low ripple and low noise for the MCU, OP, and other control units of the subsequent stage.
The dc filter module 30 is connected to the dc voltage output terminal VDD. The ripple and noise are lower than 50mV when outputting the dc voltage of 5V and the current of 1A, which is excellent in many applications, but in the power supply of the rf unit and the analog front end, considering the receiving sensitivity of the rf signal and the amplification of the analog signal, a power supply system with lower noise is required, and a better active filtering design is required, so the dc filtering module 30 is further improved in this embodiment.
Specifically, the dc filtering module 30 includes an active filtering circuit, where the active filtering circuit is composed of a tenth resistor R10, an eleventh resistor R11, an eleventh capacitor C11, a twelfth capacitor C12, and a second operational amplifier U2, a first end of the eleventh resistor R11 is connected to the dc voltage output terminal VDD, a second end of the eleventh resistor R11 is connected to the first end of the eleventh capacitor C11, a second end of the eleventh capacitor C11 is connected to an inverting input terminal of the second operational amplifier U2, an non-inverting input terminal of the second operational amplifier U2 is grounded, the tenth resistor R10 is connected between the inverting input terminal of the second operational amplifier U2 and an output terminal of the second operational amplifier U2, a first end of the twelfth capacitor C12 is connected to the output terminal of the second operational amplifier U2, and a second end of the twelfth capacitor C12 is connected to the second end of the eleventh resistor R11 and the first end of the eleventh capacitor C11.
The ripple and noise enter the inverting input port of the second operational amplifier U2 through the eleventh resistor R11 and the eleventh capacitor C11, the amplified output ripple and noise are in opposite phases, and the amplified output ripple and noise are converged in the dot of the image dotted line through the twelfth capacitor C12, so that the ac signals in the positive phase which do not enter the eleventh capacitor C11 cancel each other, and VCC with smaller ripple and noise can be obtained. The calculation model is as follows: v (V) O ＝V i /[R10·R11·C11·C12·S 2 +R11·(C11+C12)·S+1]Here V O Output ripple, noise, V i S is a calculation variable factor for input ripple and noise, and is determined according to the characteristics of different operational amplifiers. In the present embodiment, the ripple and noise of the output dc VCC are 5mV or less, and the output voltage is dc 5V, and the current is 1A.
Through the establishment and verification of the Pspice model, the reliability of the circuit is verified through the simulation model, and the result shows that the input waveform of 1V outputs a waveform of only 140mV, and the ripple wave and the noise are of only 2.9mV. In an actual verification board, the ripple noise of VCC is lower than 50mV (output 5V/1A), and after the filtering of the DC filtering module 30, the ripple noise is reduced to below 5 mV. In the application of the present embodiment, r10=r11, less than 100 ohms, c11=c12, and more than 10uF is set. Therefore, the dc filter module 30 has a very remarkable effect of reducing the ripple and the noise.
Optionally, as a further optimization, the zero crossing detection system of the present embodiment further includes a filtering and amplifying module 40, where the secondary winding of the transformer T1 is connected to the secondary sensing signal terminal s_in, and the filtering and amplifying module 40 is connected to the secondary sensing signal terminal s_in.
Specifically, the filtering and amplifying module 40 includes a low-pass filter 41, a third operational amplifier U3, a fourth operational amplifier U4, and an anti-clutter interference circuit 42, where the low-pass filter 41 is connected to the non-inverting input end of the third operational amplifier U3, the output end of the third operational amplifier U3 is connected to the non-inverting input end of the fourth operational amplifier U4, and the input end of the fourth operational amplifier U4 is connected to the anti-clutter interference circuit 42.
The low-pass filter 41 is composed of a fifteenth capacitor C15, a twelfth resistor R12, and a fourteenth resistor R14.
The filter amplification module 40 further includes a thirteenth capacitor C13, a seventeenth resistor R17, an eighteenth resistor R18, a seventeenth capacitor C17, a fourteenth capacitor C14, and a nineteenth resistor R19, where the thirteenth capacitor C13 is used as a decoupling capacitor of the third operational amplifier U3, the seventeenth resistor R17 is used as a negative feedback resistor of the third operational amplifier U3, the eighteenth resistor R18 and the seventeenth capacitor C17 form a zero compensation circuit of the third operational amplifier U3, the fourteenth capacitor C14 is used as a decoupling capacitor of the fourth operational amplifier U4, and the nineteenth resistor R19 is used as a negative feedback resistor of the fourth operational amplifier U4.
The fifteenth resistor R15 is used as an output load of the transformer L1, the filtering and amplifying module 40 obtains a transformer sampling signal S_in after obtaining the sampling, the transformer sampling signal S_in enters the operational amplifier U3 through the low-pass filter 41, and the twelfth resistor R12 and the fourteenth resistor R14 divide VCC to give bias current and voltage to the U3, F hpass ＝1/[2π·C15·(R12||R14)](high pass filter cut-off frequency). C13 is a decoupling capacitor of U3, R17 is a negative feedback resistor of U3, R18 and C17 form a zero compensation circuit of U3, and zero frequency is F Z1 =1/(2pi·c17·r18), here the zero frequency of the U3 op amp is set to 30Hz. The signal amplified by U3 enters the same-phase end of U4 for amplification. C14 is the decoupling capacitance of U4, R19 is the negative feedback resistance of U4, C16 and R19 form the pole frequency F of U4 P1 =1/(2pi·c16·r19), where the pole frequency of U4 is setIs 70Hz. Zero frequency F of U4 is formed by C18 and R20 Z2 =1/(2pi·c18·r20). The zero frequency of U4 is set at 40Hz.
The anti-clutter interference circuit 42 includes a second triode Q2, a third triode Q3, a twenty-first resistor R21, a twenty-second resistor R22, a nineteenth capacitor C19, and a twentieth capacitor C20, where the signal output by the fourth operational amplifier U4 is sampled by the isolation of the second triode Q2, and the twenty-first resistor R21, the twenty-second resistor R22, the nineteenth capacitor C19, and the twentieth capacitor C20 form a second pi-type filter for controlling the conduction of the third triode Q3, so that noise at the input end is filtered, and the signal amplification can be realized by selecting an operational amplifier with lower precision because of filtering noise, thereby reducing the cost.
In addition, the zero-crossing detection circuit can design the bottom of the PCB into a complete ground plane in practical implementation, so that stray interference is avoided in a signal amplification system, meanwhile, better EMC is realized, and each electronic device can be arranged on the top layer of the PCB to facilitate decoupling and good matching signals of the ground plane.
In addition, based on the above circuit structure, according to the waveform of signal acquisition and the interference of the clutter, the oscilloscope is used for testing data, and the interference problem is considered, and the embodiment also provides an anti-interference filtering method, which comprises the following steps:
starting;
delay 5ms;
starting interrupt triggering;
starting a counter;
calculating the time interval of the adjacent rising edges;
judging whether the time interval between the two rising edges is greater than 1.5ms;
if yes, triggering data are valid, delaying for 5ms, starting an IO port of output control, and controlling an output command; return to
If not, returning to the step of starting interrupt triggering.
In summary, in the zero-crossing detection system, a stable and reliable zero-crossing signal can be obtained, meanwhile, the sampling circuit has no loss, so that loss cost can be saved for the market in the application field, and the zero-crossing detection system is environment-friendly and low-carbon. In addition, the design of the low-noise power supply can provide a power supply system with extremely low noise in the field of intelligent IOT to supply power to the radio frequency unit of the equipment, so that the radio frequency performance is improved, the interconnection and the intercommunication of all the equipment are more reliably connected, the stability of data transmission is ensured, the interference of noise waves is avoided, and the receiving sensitivity of the radio frequency unit is improved. In the micro signal amplification neighborhood, the common operational amplifier can be adopted to realize the characteristics of strong anti-interference capability, low noise amplification, low cost and stable and reliable performance.
It should be noted that the zero-crossing detection system provided by the invention can be applied to the application field of the system requiring zero-crossing detection with strong anti-interference capability and zero loss, the system requiring low noise and high efficiency power supply design, and the application field requiring common operational amplifier implementation to realize low noise amplification. Such as the field of instrumentation, amplification of instrumentation microvolts.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (8)
1. The zero-crossing detection system is characterized by comprising a zero-crossing signal sampling module, a power supply module and a direct-current filtering module;
the zero-crossing signal sampling module comprises an anti-lightning surge interference circuit and a transformer, wherein the anti-lightning surge interference circuit is respectively connected with an alternating current live wire input end, an alternating current zero line input end and a primary winding of the transformer, the anti-lightning surge interference circuit at least comprises a safety capacitor, the primary winding of the transformer and the safety capacitor form a first filter circuit, and the primary winding of the transformer is connected in series with an alternating current power grid;
the power module comprises a bridge pile, a clamping circuit, an adjusting transformer and a primary side feedback system, wherein the bridge pile is respectively connected with the zero-crossing signal sampling module and the clamping circuit, the clamping circuit is connected with a second auxiliary winding of the adjusting transformer, a first auxiliary winding of the adjusting transformer is connected with the primary side feedback system, a secondary side winding of the adjusting transformer outputs direct-current voltage, and a buffer circuit for reducing ripple waves and noise is arranged at the secondary side winding and the direct-current voltage output end of the adjusting transformer;
the direct current filter module is connected with the direct current voltage output end;
the primary side feedback system comprises a rectifying circuit, a pi-type filter circuit, a phase compensation circuit, a feedback circuit and a control chip, wherein the rectifying circuit is connected with a first auxiliary winding of the regulating transformer, the pi-type filter circuit is respectively connected with the rectifying circuit and the control chip, the phase compensation circuit is connected between the pi-type filter circuit and the rectifying circuit, and the feedback circuit is respectively connected with the first auxiliary winding of the regulating transformer and the control chip;
the direct current filter module comprises an active filter circuit, the active filter circuit is composed of a tenth resistor, an eleventh capacitor, a twelfth capacitor and a second operational amplifier, a first end of the eleventh resistor is connected with the direct current voltage output end, a second end of the eleventh resistor is connected with the first end of the eleventh capacitor, a second end of the eleventh capacitor is connected with an inverting input end of the second operational amplifier, an in-phase input end of the second operational amplifier is grounded, the tenth resistor is connected between the inverting input end of the second operational amplifier and an output end of the second operational amplifier, a first end of the twelfth capacitor is connected with an output end of the second operational amplifier, and a second end of the twelfth capacitor is respectively connected with a second end of the eleventh resistor and a first end of the eleventh capacitor.
2. The zero crossing detection system of claim 1, further comprising a filter amplification module, wherein a secondary winding of the transformer is connected to a secondary sense signal terminal, and wherein the filter amplification module is connected to the secondary sense signal terminal.
3. The zero crossing detection system of claim 2, wherein the filtering amplification module comprises a low pass filter, a third operational amplifier, a fourth operational amplifier, and an anti-clutter interference circuit, the low pass filter is connected to the non-inverting input of the third operational amplifier, the output of the third operational amplifier is connected to the non-inverting input of the fourth operational amplifier, and the input of the fourth operational amplifier is connected to the anti-clutter interference circuit.
4. The zero crossing detection system of claim 3, wherein the anti-clutter interference circuit comprises a second triode, a third triode, a twenty-first resistor, a twenty-second resistor, a nineteenth capacitor, and a twentieth capacitor, and wherein the signal output by the fourth operational amplifier is subjected to isolated sampling by the second triode, and the twenty-first resistor, the twenty-second resistor, the nineteenth capacitor, and the twentieth capacitor form a second pi-type filter for controlling conduction of the third triode.
5. The zero crossing detection system of claim 1, wherein the anti-lightning surge disturbance circuit further comprises a varistor connected between the ac hot input and the ac neutral input and a safety resistor connected between the ac hot input and the safety capacitor, and wherein the snubber circuit comprises a third capacitor and a second resistor connected in series between the secondary winding of the regulating transformer and the dc voltage output.
6. The zero crossing detection system of claim 1, wherein the power module further comprises a second filter circuit coupled to the bridge stack, the clamping circuit comprising a first resistor, a first capacitor, and a first diode, the first resistor and the first capacitor being coupled in parallel between the bridge stack and a cathode of the first diode, an anode of the first diode being coupled to a second auxiliary winding of the regulating transformer.
7. A zero crossing detection system as claimed in claim 3, wherein the filter amplification module further comprises a thirteenth capacitor, a seventeenth resistor, an eighteenth resistor, a seventeenth capacitor, a fourteenth capacitor, and a nineteenth resistor, the thirteenth capacitor being a decoupling capacitor of the third operational amplifier, the seventeenth resistor being a negative feedback resistor of the third operational amplifier, the eighteenth resistor and the seventeenth capacitor constituting a zero compensation circuit of the third operational amplifier, the fourteenth capacitor being a decoupling capacitor of the fourth operational amplifier, and the nineteenth resistor being a negative feedback resistor of the fourth operational amplifier.
8. The zero crossing detection system as claimed in any one of claims 1 to 7, wherein the magnetic core of the transformer is an amorphous nanomagnetic loop having a diameter of 5.5mm and a inductance of 350uH, the wire winding is a 0.25mm composite wire comprising 95.5% Sn, 3% Ag, 1.5% Cu, the primary and secondary windings of the transformer are wound in phase for 50 turns and the inductance of the coil is 5uH.
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| CN111446936B (en) * | 2020-05-14 | 2023-08-25 | 山东恒力电机有限公司 | Instrument circuit and ship instrument adopting same |
| CN112540219A (en) * | 2020-11-13 | 2021-03-23 | 珠海格力电器股份有限公司 | Zero-crossing detection circuit and control circuit |
| CN112505421A (en) * | 2020-11-16 | 2021-03-16 | 广东电网有限责任公司 | Measuring circuit for direct current resistance of dry-type air-core reactor |
| CN116567906B (en) * | 2023-06-26 | 2024-01-30 | 江苏神州半导体科技有限公司 | Ignition circuit structure of plasma system and ignition protection method |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2824296A (en) * | 1955-09-20 | 1958-02-18 | Sperry Rand Corp | Redundant fail-proof amplifier and alarm |
| CN201156708Y (en) * | 2008-01-16 | 2008-11-26 | 李党卫 | Power adapter having active power factor correcting function |
| CN205103301U (en) * | 2015-10-14 | 2016-03-23 | 嘉兴金尚节能科技有限公司 | Hourglass current detection circuit who restraines common mode interference |
| CN206250965U (en) * | 2016-11-09 | 2017-06-13 | 苏州工业职业技术学院 | Voltage adaptive Switching Power Supply |
| CN206640841U (en) * | 2017-04-10 | 2017-11-14 | 深圳天源中芯半导体有限公司 | A kind of PWM light adjusting circuits for High Power Factor primary side feedback LED drive power |
| CN108599594A (en) * | 2018-04-03 | 2018-09-28 | 西安电子科技大学 | A kind of AC-DC Isobarically Controls converter |
| CN108667285A (en) * | 2018-04-20 | 2018-10-16 | 深圳市芯飞凌半导体有限公司 | Adjust the control circuit and Switching Power Supply of switching frequency and load current relationship |
| CN208369896U (en) * | 2017-12-27 | 2019-01-11 | 东莞市盈聚电源有限公司 | A kind of anti-lightning LED drive circuit |
| CN109214377A (en) * | 2018-07-27 | 2019-01-15 | 深圳市闿思科技有限公司 | Sequence number recognition methods, system, mobile terminal and storage medium |
-
2019
- 2019-04-16 CN CN201910305914.1A patent/CN109946506B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2824296A (en) * | 1955-09-20 | 1958-02-18 | Sperry Rand Corp | Redundant fail-proof amplifier and alarm |
| CN201156708Y (en) * | 2008-01-16 | 2008-11-26 | 李党卫 | Power adapter having active power factor correcting function |
| CN205103301U (en) * | 2015-10-14 | 2016-03-23 | 嘉兴金尚节能科技有限公司 | Hourglass current detection circuit who restraines common mode interference |
| CN206250965U (en) * | 2016-11-09 | 2017-06-13 | 苏州工业职业技术学院 | Voltage adaptive Switching Power Supply |
| CN206640841U (en) * | 2017-04-10 | 2017-11-14 | 深圳天源中芯半导体有限公司 | A kind of PWM light adjusting circuits for High Power Factor primary side feedback LED drive power |
| CN208369896U (en) * | 2017-12-27 | 2019-01-11 | 东莞市盈聚电源有限公司 | A kind of anti-lightning LED drive circuit |
| CN108599594A (en) * | 2018-04-03 | 2018-09-28 | 西安电子科技大学 | A kind of AC-DC Isobarically Controls converter |
| CN108667285A (en) * | 2018-04-20 | 2018-10-16 | 深圳市芯飞凌半导体有限公司 | Adjust the control circuit and Switching Power Supply of switching frequency and load current relationship |
| CN109214377A (en) * | 2018-07-27 | 2019-01-15 | 深圳市闿思科技有限公司 | Sequence number recognition methods, system, mobile terminal and storage medium |
Non-Patent Citations (1)
| Title |
|---|
| 一种低压TSC的过零触发电路设计;李琳 等;《工业控制计算机》;第28卷(第3期);第171-172页 * |
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