CN210222114U - Zero point detection device and system - Google Patents
Zero point detection device and system Download PDFInfo
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- CN210222114U CN210222114U CN201920690434.7U CN201920690434U CN210222114U CN 210222114 U CN210222114 U CN 210222114U CN 201920690434 U CN201920690434 U CN 201920690434U CN 210222114 U CN210222114 U CN 210222114U
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Abstract
The utility model provides a zero point detection device and system relates to electrical control's technical field, and the device includes: the voltage stabilizing circuit comprises a voltage input module, a current limiting and rectifying module and a voltage stabilizing and triggering module; the voltage input module, the current-limiting rectifying module and the voltage-stabilizing triggering module are sequentially connected; the voltage input module is also connected with a voltage input device to be detected; the voltage stabilization triggering module is also connected with the voltage output device; the voltage input module is used for receiving a voltage signal to be detected; the current-limiting rectification module is used for converting a voltage signal to be detected into a small-signal direct-current voltage signal; and the voltage stabilization triggering module is used for charging when the small-signal direct-current voltage signal is at a high level and discharging to the voltage output device when the small-signal direct-current voltage signal is at a low level. The embodiment of the utility model provides a can reduce cost, improve the precision and reduce the consumption.
Description
Technical Field
The utility model belongs to the technical field of the electrical control technique and specifically relates to a detection device and system at zero point is related to.
Background
Power frequency zero detection is a special design requirement in the field of power frequency ac distribution or control and related industrial control. The power frequency zero point detection is mainly used for chopping, motor soft start, thyristor switching and the like, and a qualified zero-crossing detection device with low power consumption and high precision is still lacked in related fields.
The existing power frequency zero point detection method can be used for detecting after rectification and isolation by using a linear transformer or comparing and outputting by using an operational amplifier. However, both methods have the problems of complex design, long development period, low precision, poor stability, zero-crossing delay and the like. And the two methods have higher power consumption, the high power consumption causes the heating life of the limiting resistor to be shortened, and the operational amplifier as a voltage sensitive device is easily influenced by power frequency pulses and has poor stability.
Aiming at the problems of high cost, low precision and high power consumption of power frequency zero point detection in the prior art, an effective solution is not provided at present.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a zero point detection device and system to reduce cost, improve accuracy and reduce power consumption.
In a first aspect, an embodiment of the present invention provides a zero point detection device, including: the voltage stabilizing circuit comprises a voltage input module, a current limiting and rectifying module and a voltage stabilizing and triggering module; the voltage input module, the current-limiting rectifying module and the voltage-stabilizing triggering module are sequentially connected; the voltage input module is also connected with a voltage input device to be detected; the voltage stabilization triggering module is also connected with the voltage output device; the voltage input module is used for receiving a voltage signal to be detected; the current-limiting rectification module is used for converting a voltage signal to be detected into a small-signal direct-current voltage signal; and the voltage stabilization triggering module is used for charging when the small-signal direct-current voltage signal is at a high level and discharging to the voltage output device when the small-signal direct-current voltage signal is at a low level.
In combination with the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where the voltage input module includes: a connector; the input end of the connector is connected with a voltage input device to be detected, and the output end of the connector is connected with the current-limiting rectifying module; and the connector is used for receiving the voltage signal to be detected output by the voltage input device to be detected and outputting the voltage signal to be detected to the current-limiting rectifying module.
In combination with the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, where the current-limiting rectifying module includes: the current limiting circuit comprises a rectifier chip, a current limiting resistor and a filter capacitor;
the input end of the rectifying chip is connected with the output end of the voltage input module, and the output end of the rectifying chip is connected with the input end of the voltage input module; the filter capacitor is arranged between the input end of the rectifying chip and the output end of the rectifying chip; the current limiting resistor is arranged between the input end of the rectifying chip and the output end of the voltage input module, and/or the current limiting resistor is arranged between the output end of the rectifying chip and the input end of the voltage input module; the rectification chip is used for rectifying the voltage signal to be detected into a small-signal direct-current voltage signal; the current limiting resistor is used for limiting the current of the voltage signal to be detected; and the filter capacitor is used for filtering the current-limited voltage signal to be detected.
In combination with the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, wherein the voltage stabilization triggering module includes: a diode, a capacitor and a triode; the anode of the diode is connected with the second output end of the current-limiting rectifying module, the cathode of the diode is connected with the emitting electrode of the triode, and the base electrode of the triode is connected with the anode of the diode; the anode of the capacitor is connected with the cathode of the diode; the negative electrode of the capacitor is connected with the second input end of the current-limiting rectifying module; a second output end of the current-limiting rectifying module outputs a small-signal direct-current voltage signal, and when the voltage of the small-signal direct-current voltage signal is higher than the threshold voltage of the diode, the diode is conducted, and the capacitor is charged; when the small-signal direct-current voltage signal is lower than the threshold voltage of the diode, the capacitor discharges, the triode is conducted, and the collector of the triode discharges.
With reference to the third possible implementation manner of the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where the voltage stabilization triggering module further includes: a voltage stabilizing diode and a current limiting resistor; the voltage stabilizing diode is connected with the current limiting resistor in parallel and arranged between the second output end of the current limiting rectifying module and the second input end of the current limiting rectifying module; the voltage stabilizing diode is used for limiting the voltage of the small-signal direct-current voltage signal within a preset voltage threshold value; and the current limiting resistor is used for limiting the voltage of the small-signal direct-current voltage signal within a preset current threshold value.
With reference to the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, where: the optocoupler trigger module; the voltage-stabilizing triggering module is connected with the optocoupler triggering module; and the optocoupler trigger module is used for outputting a trigger signal when the voltage stabilization trigger module discharges.
In combination with the fifth possible implementation manner of the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, where the optocoupler trigger module includes: an optical coupler; the anode of the optical coupler is connected with the second output end of the voltage stabilization triggering module, the cathode of the optical coupler is connected with the second input end of the voltage stabilization triggering module, the collector of the optical coupler is connected with a fixed voltage, and the emitter of the optical coupler is grounded; when the second output end of the voltage stabilization triggering module discharges to the anode of the optical coupler, the light emitting diode of the optical coupler is conducted to emit light, the phototriode of the optical coupler is conducted, and the emitting electrode of the optical coupler outputs a triggering signal.
With reference to the fifth possible implementation manner of the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, where: a voltage width filtering module; the pressure width filtering module is connected with the optocoupler triggering module; and the voltage width filtering module is used for converting the voltage of the trigger signal into a direct current signal with fixed voltage.
With reference to the seventh possible implementation manner of the first aspect, an embodiment of the present invention provides an eighth possible implementation manner of the first aspect, where: a level output module; the level output module is connected with the voltage width filtering module; and the level output module is used for outputting a trigger level signal according to the direct current signal of the fixed voltage.
In a second aspect, the embodiment of the present invention further provides a zero point detection system, including: a voltage input device to be tested and a zero detection device as provided in the first aspect and one of its possible embodiments; the voltage input device to be detected is connected with the voltage input module; and the voltage input device to be detected is used for outputting a voltage signal to be detected.
The embodiment of the utility model provides a following beneficial effect has been brought:
the embodiment of the utility model provides a zero point detection device and system receives the voltage signal who waits to detect through voltage input module, and after the voltage signal who will wait to detect through current-limiting rectifier module turned into the small signal direct current voltage signal, steady voltage trigger module charges when the small signal direct current voltage signal is in the high level, and steady voltage trigger module discharges when the small signal direct current voltage signal is in the low level, can reduce cost, improve the precision and reduce the consumption.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a structural diagram of a zero point detection device according to an embodiment of the present invention;
fig. 2 is a circuit structure diagram of a zero point detection device according to an embodiment of the present invention;
fig. 3 is a structural diagram of another zero point detection device according to an embodiment of the present invention;
fig. 4 is a structural diagram of another zero point detecting device according to an embodiment of the present invention;
fig. 5 is a structural diagram of another zero point detecting device according to an embodiment of the present invention;
fig. 6 is a waveform diagram of a zero point detection device according to an embodiment of the present invention;
fig. 7 is a waveform diagram of another zero point detection device according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a zero point detection system according to an embodiment of the present invention.
Icon: 1-a voltage input module; 2-a current limiting rectification module; 3, a voltage stabilization triggering module; 101-voltage input means; 103-voltage output means; 4-optical coupling trigger module; 5-a voltage width filtering module; 6-a level output module; 100-zero point detection device.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.
The existing power frequency zero point detection method has the problems of complex design, long development period, low precision, poor stability, zero-crossing delay and the like, the existing power frequency zero point detection method has high power consumption, the high power consumption causes the heating life of a limiting resistor to be shortened, and the operational amplifier serving as a voltage sensitive device is easily influenced by power frequency pulses and has poor stability. Based on this, the embodiment of the utility model provides a detection device and system at zero point can be applied to industrial control or electrical control field, especially can be applied to among power frequency alternating current distribution or control and the relevant industrial control field.
For the convenience of understanding the present embodiment, a zero point detection device disclosed in the embodiments of the present invention will be described in detail first.
The first embodiment is as follows:
the embodiment of the utility model provides a detection device at zero point, see the structure chart of a detection device at zero point that figure 1 is shown, include: the device comprises a voltage input module 1, a current-limiting rectifying module 2 and a voltage-stabilizing triggering module 3;
the voltage input module 1, the current-limiting rectifying module 2 and the voltage-stabilizing triggering module 3 are sequentially connected; the voltage input module 1 is also connected with a voltage input device 101 to be detected; the voltage stabilization triggering module 3 is also connected with the voltage output device 103;
two channels are connected among the voltage input module, the current-limiting rectifying module and the voltage-stabilizing triggering module, the voltage input module is connected with the voltage input device to be detected through 1 channel, and the voltage-stabilizing triggering module is connected with the voltage output device through 1 channel.
The voltage input module 1 is used for receiving a voltage signal to be detected;
the voltage input device to be detected sends a voltage signal to be detected to the voltage input module, and the voltage input module sends the voltage signal to be detected to the current-limiting rectifying module after receiving the voltage signal to be detected.
The current-limiting rectifying module 2 is used for converting a voltage signal to be detected into a small-signal direct-current voltage signal;
after receiving the voltage signal to be detected, the current-limiting rectification module carries out current limiting and rectification on the voltage signal to be detected to generate a small-signal direct-current voltage signal and sends the small-signal direct-current voltage signal to the voltage-stabilizing triggering module.
And the voltage stabilization triggering module 3 is used for charging when the small-signal direct-current voltage signal is at a high level and discharging to the voltage output device 103 when the small-signal direct-current voltage signal is at a low level.
When the small-signal direct-current voltage signal is at a high level, the voltage-stabilizing trigger module charges firstly after receiving the small-signal direct-current voltage signal, and the voltage output device does not receive the signal; when the small-signal direct-current voltage signal is at a low level, namely the voltage signal is in a power frequency zero state, the voltage stabilizing trigger module discharges, and the voltage output device receives the voltage signal so as to realize the power frequency zero detection function.
The embodiment of the utility model provides an above-mentioned device, through the voltage input module receipt treat the voltage signal who detects, after the voltage signal who will treat through current-limiting rectifier module and wait to detect turned into the small-signal direct current voltage signal, steady voltage trigger module charges when the small-signal direct current voltage signal is in the high level, steady voltage trigger module discharges when the small-signal direct current voltage signal is in the low level, can reduce cost, improve the precision and reduce the consumption. Referring to a circuit structure diagram of a zero point detection apparatus shown in fig. 2, it should be noted that values of each device in fig. 2 are only given as an example, and may be other values, and devices may be deleted or replaced.
Referring to fig. 2, a circuit structure diagram of a zero point detecting apparatus for a voltage input module includes: the input end of the connector is connected with the voltage input device to be detected, and the output end of the connector is connected with the current-limiting rectifying module; and the connector is used for receiving the voltage signal to be detected output by the voltage input device to be detected and outputting the voltage signal to be detected to the current-limiting rectifying module.
The connector is P1 in FIG. 2, and P1 is used for power frequency voltage input. The slot of P1 may be inserted with a voltage input device to be tested. Port 2 of P1 is live and port 1 is neutral. The embodiment of the utility model provides an above-mentioned device, voltage input module include the connector for insert voltage input device.
For the current-limiting rectifying module, referring to a circuit structure diagram of a zero point detection device shown in fig. 2, the circuit structure diagram includes: the current limiting circuit comprises a rectifier chip, a current limiting resistor and a filter capacitor; the input end of the rectifying chip is connected with the output end of the voltage input module, and the output end of the rectifying chip is connected with the input end of the voltage input module; the filter capacitor is arranged between the input end of the rectifying chip and the output end of the rectifying chip; the current limiting resistor is arranged between the input end of the rectifying chip and the output end of the voltage input module, and/or the current limiting resistor is arranged between the output end of the rectifying chip and the input end of the voltage input module; the rectification chip is used for rectifying the voltage signal to be detected into a small-signal direct-current voltage signal; the current limiting resistor is used for limiting the current of the voltage signal to be detected; and the filter capacitor is used for filtering the current-limited voltage signal to be detected.
The current limiting rectifier module in fig. 2 includes not only the contents of block 2, but also: resistor R1, resistor R3 and capacitor C1. The rectifier chip is U1 in FIG. 2, model No. MB6S, and MB6S is a rectifier bridge, i.e. converting AC into DC. The resistor R1 and the resistor R3 are not required at the same time, and only one resistor is required, and R1 and R3 can both be 300k omega. The capacitor C1 may be a 1KV, 150PF capacitor. The resistor R1 and the resistor R3 are used for limiting the current of the voltage signal to be detected, and the capacitor C1 is used for filtering the current-limited voltage signal to be detected, wherein the phase lag is formed by the capacitor C1. The rectifier chip U1 is used for rectification, will commutate power frequency alternating current into pulse direct current, i.e. small signal direct current voltage signal. The embodiment of the utility model provides an above-mentioned device, current-limiting rectifier module include rectifier chip, current-limiting resistor and filter capacitance for current-limiting and rectification.
For the voltage stabilization triggering module, referring to a circuit structure diagram of a zero point detection device shown in fig. 2, the circuit structure diagram includes: a diode, a capacitor and a triode; the anode of the diode is connected with the second output end of the current-limiting rectifying module, the cathode of the diode is connected with the emitting electrode of the triode, and the base electrode of the triode is connected with the anode of the diode; the anode of the capacitor is connected with the cathode of the diode; the negative electrode of the capacitor is connected with the second input end of the current-limiting rectifying module; a second output end of the current-limiting rectifying module outputs a small-signal direct-current voltage signal, and when the voltage of the small-signal direct-current voltage signal is higher than the threshold voltage of the diode, the diode is conducted, and the capacitor is charged; when the small-signal direct-current voltage signal is lower than the threshold voltage of the diode, the capacitor discharges, the triode is conducted, and the collector of the triode discharges.
The diode D1 in fig. 2 is the aforementioned diode, model 1N 4148; the capacitor C2 and the capacitor C3 are the above capacitors, and it should be noted that the capacitor C3 and the capacitor C2 may both be capacitors of 50V and 1uF, and may also be replaced by other capacitors of different numbers, for example: a 50V, 2uF capacitor can be used to replace the capacitor C3 and the capacitor C2; the transistor Q1 is the above transistor, and has a model number S8550. When the input small-signal direct-current voltage signal reaches the conduction threshold voltage of the diode D1, the diode D1 is conducted, the highest voltage is generally 11.3V, the capacitor C3 and the capacitor C2 are charged, the collector and the emitter are not conducted because the base of the triode Q1 is at a high level at the moment, when the input small-signal direct-current voltage signal is lower than the threshold voltage of the diode D1, the threshold voltage is generally 0.7V, namely the zero point of the small-signal direct-current voltage signal area at the moment, the base potential of the triode Q1 is pulled down, the triode Q1 is conducted, and the collector of the triode discharges. The embodiment of the utility model provides an above-mentioned device, current-limiting rectifier module steady voltage trigger module include diode, electric capacity and triode for charge at high potential electric capacity, the triode of power frequency zero discharges.
In addition, for the voltage stabilization triggering module, referring to a circuit structure diagram of a zero point detection device shown in fig. 2, the method further includes: a voltage stabilizing diode and a current limiting resistor; the voltage stabilizing diode is connected with the current limiting resistor in parallel and arranged between the second output end of the current limiting rectifying module and the second input end of the current limiting rectifying module; the voltage stabilizing diode is used for limiting the voltage of the small-signal direct-current voltage signal within a preset voltage threshold value; and the current limiting resistor is used for limiting the voltage of the small-signal direct-current voltage signal within a preset current threshold value.
The diode D2 in fig. 2 is the zener diode, and is 1N 4742; the resistor R2 is a current limiting resistor, and the resistance of the resistor R2 may be 300K Ω. Diode D2 is used to limit the voltage of the small signal dc voltage signal to within a preset voltage threshold, typically within 12V. Resistor R2 is used to limit the current of the small signal dc voltage signal. The embodiment of the utility model provides an above-mentioned device, steady voltage trigger module still include zener diode, current-limiting resistor for steady voltage and current-limiting.
Further, referring to a configuration diagram of another zero point detecting device shown in fig. 3, the zero point detecting device further includes: the optocoupler trigger module 4; the voltage-stabilizing triggering module 3 is connected with the optocoupler triggering module 4; and the optocoupler trigger module 4 is used for outputting a trigger signal when the voltage stabilization trigger module discharges.
And when the power frequency is at zero point, the voltage-stabilizing trigger module discharges, and the optocoupler trigger module is equivalent to a switch and outputs a trigger signal. Referring to a circuit diagram of a zero point detection device shown in fig. 2, the optocoupler trigger module includes: an optical coupler; the anode of the optical coupler is connected with the second output end of the voltage stabilization triggering module, the cathode of the optical coupler is connected with the second input end of the voltage stabilization triggering module, the collector of the optical coupler is connected with a fixed voltage, and the emitter of the optical coupler is grounded; when the second output end of the voltage stabilization triggering module discharges to the anode of the optical coupler, the light emitting diode of the optical coupler is conducted to emit light, the phototriode of the optical coupler is conducted, and the emitting electrode of the optical coupler outputs a triggering signal. The type of the optocoupler in fig. 2 is EL3H7D, and capacitors C2 and C3 will discharge the stored voltage at the power frequency zero point to trigger the EL3H7D optocoupler through a triode Q1. The optical coupler is conducted and outputs high level. The resistance of the resistor R5 is 10K omega, and the collector of the coupler is connected with a fixed voltage of 5V. The embodiment of the utility model provides an above-mentioned device, the optical coupler output trigger signal who includes through opto-coupler trigger module.
The voltage signal output by the optical coupler is a linear voltage signal, and needs to be regulated and limited, so, referring to another structure diagram of the zero point detection device shown in fig. 4, the zero point detection device further includes: a voltage width filtering module 5; the pressure width filtering module 5 is connected with the optocoupler triggering module 4; and the voltage width filtering module 5 is used for converting the voltage of the trigger signal into a direct current signal with fixed voltage.
The voltage width filtering module comprises a schmitt inverter and a current-limiting resistor, as shown in fig. 2, the schmitt inverter is of the model number SN74LVC1G14DBV, the resistor R4 is a current-limiting resistor, and the resistance is 4.7K Ω. The Schmidt inverter is connected with a fixed voltage of 5V, the optical coupler works in a linear amplification area, and the output voltage fluctuates. The output voltage is a direct current signal of 5V, and then the current is limited by a resistor R4. The embodiment of the utility model provides an above-mentioned device, through the wide filtering module output steady voltage direct current signal of pressure.
The output dc signal needs to be connected to the voltage output device through the level output module, referring to another structure diagram of the zero point detecting device shown in fig. 5, the zero point detecting device further includes: a level output module 6; the level output module 6 is connected with the voltage width filtering module 5; and the level output module 6 is used for outputting a trigger level signal according to the direct current signal of the fixed voltage.
Referring to a circuit configuration diagram of a zero point detecting apparatus shown in fig. 2, a level output block is noted as a connector P2. Pin 3 of the connector P2 needs to provide a detection voltage of 5V, pin 2 is a zero-crossing output pin, and pin 1 is a signal GND terminal. The zero-point detection device shown in fig. 5 has low zero-crossing detection cost; the detection power consumption is low, and the current of a power frequency side is less than 70 mW; the detection precision is high and is equal to 1 degree approximately. The voltage output device is inserted into the slot of the connector, and the trigger level signal can be provided for the voltage output device. The embodiment of the utility model provides an above-mentioned device is connected with voltage output device through level output module, and the output triggers level signal.
In addition, when the capacitors C2 and C3 are charged, the transistor Q1 is turned on between the triggering of the optocoupler, the relationship between the charging voltage of the capacitors C2 and C3 and the trigger pulse of the optocoupler can be seen in a waveform diagram of the zero detection device shown in fig. 6, where the upper part is the waveform of the capacitor charging and discharging, and the lower part is the waveform of the triggering of the optocoupler, it can be seen that: the capacitor does not discharge once, the optocoupler triggers once, and the precision is very high.
For the relationship between the power frequency ac zero point and the output voltage of the optocoupler, see a waveform diagram of another zero point detection device shown in fig. 7, it can be seen that: each zero point of power frequency alternating current is triggered by one optocoupler, and the precision is very high.
The embodiment of the utility model provides a zero point detection device. The voltage input module is used for receiving a voltage signal to be detected, the current-limiting rectification module is used for converting the voltage signal to be detected into a small-signal direct-current voltage signal, the voltage-stabilizing trigger module is used for charging when the small-signal direct-current voltage signal is at a high level, and the voltage-stabilizing trigger module is used for discharging when the small-signal direct-current voltage signal is at a low level; the voltage input module comprises a connector for inserting the voltage input device; the current-limiting rectifying module comprises a rectifying chip, a current-limiting resistor and a filter capacitor and is used for current limiting and rectifying; the current-limiting rectifying module voltage-stabilizing triggering module comprises a diode, a capacitor and a triode and is used for charging at a high-potential capacitor and discharging at a power frequency zero triode; the voltage stabilizing trigger module also comprises a voltage stabilizing diode and a current limiting resistor, and is used for stabilizing voltage and limiting current; outputting a trigger signal through an optical coupler included by the optical coupling trigger module; outputting a voltage-stabilizing direct current signal through a voltage-width filtering module; the trigger level signal is output by connecting the level output module with the voltage output device; cost can be reduced, accuracy can be improved, and power consumption can be reduced.
Example two:
the voltage input device 101 to be detected is connected with the voltage input module 1;
and a voltage input device 101 to be detected, for outputting a voltage signal to be detected.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the zero point detection system described above may refer to the corresponding process in the foregoing embodiment, and is not described herein again.
The embodiment of the utility model provides a zero point detecting system has the same technical characteristic with the zero point detection device that above-mentioned embodiment provided, so also can solve the same technical problem, reach the same technological effect.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still modify or easily conceive of changes in the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within 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 zero point detecting device, comprising: the voltage stabilizing circuit comprises a voltage input module, a current limiting and rectifying module and a voltage stabilizing and triggering module;
the voltage input module, the current-limiting rectifying module and the voltage-stabilizing triggering module are sequentially connected; the voltage input module is also connected with a voltage input device to be detected; the voltage stabilization trigger module is also connected with the voltage output device;
the voltage input module is used for receiving a voltage signal to be detected;
the current-limiting rectifying module is used for converting the voltage signal to be detected into a small-signal direct-current voltage signal;
the voltage stabilization triggering module is used for charging when the small-signal direct-current voltage signal is at a high level and discharging to the voltage output device when the small-signal direct-current voltage signal is at a low level.
2. The zero-point detecting apparatus according to claim 1, wherein the voltage input module includes: a connector;
the input end of the connector is connected with the voltage input device to be detected, and the output end of the connector is connected with the current-limiting rectifying module;
the connector is used for receiving the voltage signal to be detected output by the voltage input device to be detected and outputting the voltage signal to be detected to the current-limiting rectifying module.
3. The zero-point detection device of claim 1, wherein the current-limiting rectifier module comprises: the current limiting circuit comprises a rectifier chip, a current limiting resistor and a filter capacitor;
the input end of the rectifying chip is connected with the output end of the voltage input module, and the output end of the rectifying chip is connected with the input end of the voltage input module; the filter capacitor is arranged between the input end of the rectification chip and the output end of the rectification chip;
the current limiting resistor is arranged between the input end of the rectifying chip and the output end of the voltage input module, and/or the current limiting resistor is arranged between the output end of the rectifying chip and the input end of the voltage input module;
the rectification chip is used for rectifying the voltage signal to be detected into the small-signal direct-current voltage signal;
the current limiting resistor is used for limiting the current of the voltage signal to be detected;
and the filter capacitor is used for filtering the voltage signal to be detected after current limiting.
4. The zero-point detection apparatus according to claim 1, wherein the voltage stabilization triggering module comprises: a diode, a capacitor and a triode;
the anode of the diode is connected with the second output end of the current-limiting rectifying module, the cathode of the diode is connected with the emitting electrode of the triode, and the base electrode of the triode is connected with the anode of the diode; the anode of the capacitor is connected with the cathode of the diode; the negative electrode of the capacitor is connected with the second input end of the current-limiting rectifying module;
a second output end of the current-limiting rectifying module outputs a small-signal direct-current voltage signal, and when the voltage of the small-signal direct-current voltage signal is higher than the threshold voltage of the diode, the diode is conducted, and the capacitor is charged; when the small-signal direct-current voltage signal is lower than the threshold voltage of the diode, the capacitor discharges, the triode is conducted, and the collector of the triode discharges.
5. The zero-point detection apparatus according to claim 4, wherein the voltage stabilization triggering module further comprises: a voltage stabilizing diode and a current limiting resistor;
the voltage stabilizing diode is connected with the current limiting resistor in parallel and arranged between the second output end of the current limiting rectifying module and the second input end of the current limiting rectifying module;
the voltage stabilizing diode is used for limiting the voltage of the small-signal direct-current voltage signal within a preset voltage threshold value;
and the current limiting resistor is used for limiting the voltage of the small-signal direct-current voltage signal within a preset current threshold value.
6. The zero point detecting device according to claim 1, further comprising: the optocoupler trigger module;
the voltage-stabilizing triggering module is connected with the optocoupler triggering module;
and the optocoupler trigger module is used for outputting a trigger signal when the voltage stabilization trigger module discharges.
7. The zero point detection device according to claim 6, wherein the optical coupling trigger module comprises: an optical coupler;
the anode of the optical coupler is connected with the second output end of the voltage stabilization triggering module, the cathode of the optical coupler is connected with the second input end of the voltage stabilization triggering module, the collector of the optical coupler is connected with a fixed voltage, and the emitter of the optical coupler is grounded;
when the second output end of the voltage stabilization triggering module discharges to the anode of the optical coupler, the light emitting diode of the optical coupler is conducted to emit light, the phototriode of the optical coupler is conducted, and the emitter of the optical coupler outputs a triggering signal.
8. The zero point detecting device according to claim 6, further comprising: a voltage width filtering module;
the pressure width filtering module is connected with the optocoupler triggering module;
and the voltage width filtering module is used for converting the voltage of the trigger signal into a direct current signal with fixed voltage.
9. The zero point detecting device according to claim 8, further comprising: a level output module;
the level output module is connected with the voltage width filtering module;
and the level output module is used for outputting a trigger level signal according to the direct current signal of the fixed voltage.
10. A zero point detection system, comprising: a voltage input device to be tested and a zero point detection device according to any one of claims 1-9;
the voltage input device to be detected is connected with the voltage input module;
the voltage input device to be detected is used for outputting the voltage signal to be detected.
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| CN201920690434.7U CN210222114U (en) | 2019-05-13 | 2019-05-13 | Zero point detection device and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4194859A1 (en) * | 2021-12-08 | 2023-06-14 | Hangzhou Lianxintong Semiconductor Co., Ltd. | Zero-crossing detection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4194859A1 (en) * | 2021-12-08 | 2023-06-14 | Hangzhou Lianxintong Semiconductor Co., Ltd. | Zero-crossing detection circuit |
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