CN212675022U - Zero-crossing detection circuit and system - Google Patents
Zero-crossing detection circuit and system Download PDFInfo
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- CN212675022U CN212675022U CN202020904240.5U CN202020904240U CN212675022U CN 212675022 U CN212675022 U CN 212675022U CN 202020904240 U CN202020904240 U CN 202020904240U CN 212675022 U CN212675022 U CN 212675022U
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Abstract
The utility model relates to a zero-crossing detection circuit and a system, wherein the zero-crossing detection circuit comprises a full-wave rectification module which is connected with an alternating current power supply and is used for carrying out full-wave rectification on an alternating current power supply signal to obtain a pulsating direct current waveform signal; the filtering module is connected with the full-wave rectification module and is used for filtering the pulsating direct-current waveform signal; the output module is connected with the filtering module and outputs a pulse waveform signal for zero-crossing detection based on the filtered pulsating direct current waveform signal; and the voltage division module is connected between the full-wave rectification module and the filtering module. The zero-crossing detection system comprises the zero-crossing detection circuit and the MCU which is connected with the zero-crossing detection circuit and carries out zero-crossing detection based on the pulse waveform signal to obtain a detection result. The utility model discloses circuit structure is simple, easy to carry out, and the cost is lower, and it is higher to detect accuracy and reliability.
Description
Technical Field
The utility model belongs to the technical field of electronic circuit, concretely relates to zero cross detection circuit and system to exchanging the commercial power and carrying out zero cross detection.
Background
Zero-crossing detection has this wide range of applications. For example, in a circuit with a thyristor application, developers often encounter various problems, such as too large thyristor turn-on current peak, difficult complete machine EMI modification … …, if a zero-crossing detection circuit is arranged in the circuit, the thyristor is turned on at zero crossing, and these problems can be easily solved. In addition, during phase-shift dimming, speed regulation and power regulation, the AC zero crossing point can be used as a reference point for pulse width control, so zero crossing detection is also needed.
The existing zero-crossing detection circuit has the defects that an optocoupler device is large in size, and a plurality of accessory devices are required, so that the circuit design is complex, the accuracy is not high enough, and the circuit has potential safety hazards. There are also special zero-crossing detection chips, but this solution is generally more costly. Therefore, it is necessary to provide a low-cost and high-accuracy zero-crossing detection scheme.
Disclosure of Invention
The utility model aims at providing a circuit is simple, the cost is lower, the higher zero cross detection circuit of accuracy.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
a zero-crossing detection circuit comprising:
the full-wave rectification module is connected with the alternating current power supply and is used for performing full-wave rectification on an alternating current power supply signal to obtain a pulsating direct current waveform signal;
the filtering module is connected with the full-wave rectification module and is used for filtering the pulsating direct-current waveform signal;
and the output module is connected with the filtering module and outputs a pulse waveform signal for zero-crossing detection based on the filtered pulsating direct current waveform signal.
The zero-crossing detection circuit further comprises a voltage division module connected between the full-wave rectification module and the filtering module.
The full-wave rectification module comprises a first full-wave rectification tube and a second full-wave rectification tube, the first end of the first full-wave rectification tube is connected with a live wire of the alternating current power supply, the first end of the second full-wave rectification tube is connected with a zero line of the alternating current power supply, and the second end of the first full-wave rectification tube and the second end of the second full-wave rectification tube are connected with the filtering module after being connected in a common mode.
The first full-wave rectifying tube and the second full-wave rectifying tube are both rectifying diodes.
The filter wave module comprises a filter capacitor, one end of the filter capacitor is connected with the input side of the output module, and the other end of the filter capacitor is grounded.
The output module comprises a switch tube and a pull-up resistor, the base electrode of the switch tube is connected with the filtering module, the pull-up resistor is connected between a working power supply and the collector electrode of the switch tube, the emitting electrode of the switch tube is grounded, and the collector electrode of the switch tube forms the output end of the output circuit.
The zero-crossing detection circuit further comprises a reverse protection diode used for clamping BE junction voltage of the switching tube, the anode of the reverse protection diode is grounded, and the cathode of the reverse protection diode is connected with the base electrode of the switching tube.
The zero-crossing detection circuit further comprises a full-bridge rectification module which is respectively connected with the alternating current power supply and the output module and used for providing the working power supply.
And the live wire of the alternating current power supply is connected with a fuse.
The utility model also provides a zero cross detection device, it include aforementioned zero cross detection circuit and with zero cross detection circuit is connected and is based on pulse waveform signal carries out zero cross detection and obtains the MCU of testing result.
Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages: the utility model discloses circuit structure is simple, easy to carry out, and the cost is lower, and it is higher to detect accuracy and reliability.
Drawings
Fig. 1 is a schematic diagram of the zero-crossing detection circuit of the present invention.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings.
The first embodiment is as follows: as shown in fig. 1, a zero-crossing detection circuit includes a full-wave rectification module, a voltage division module, a filtering module, an output module, and a full-bridge rectification module.
The live wire L of the alternating current power supply is connected with the fuse F1 to form a node A, and the zero line N of the alternating current power supply forms a node B.
The input side of the full-bridge rectification module is connected with an alternating current power supply comprising a live wire L and a zero wire N, namely, the input side of the full-bridge rectification module is connected with a node A and a node B. The full-bridge rectifier circuit comprises a full-bridge rectifier tube D1, a full-bridge rectifier tube D3, a full-bridge rectifier tube D4 and a full-bridge rectifier tube D7. The full-bridge rectifier tubes D1, D3, D4 and D7 are diodes. The full-bridge rectifier tube D1 and the full-bridge rectifier tube D4 form a bridge arm to be connected between the node A and the node B, the positive pole of the full-bridge rectifier tube D1 is connected with the node A, the positive pole of the full-bridge rectifier tube D4 is connected with the node B, and the negative pole of the full-bridge rectifier tube D1 is connected with the negative pole of the full-bridge rectifier tube D4 to form the positive voltage output terminal of the full-bridge rectifier module. The full-bridge rectifier tube D3 and the full-bridge rectifier tube D4 form another bridge arm and are connected between the node A and the node B, the negative electrode of the full-bridge rectifier tube D3 is connected with the node A, the negative electrode of the full-bridge rectifier tube D7 is connected with the node B, and the positive electrode of the full-bridge rectifier tube D3 is connected with the positive electrode of the full-bridge rectifier tube D7 and is grounded together. The full-bridge rectification module is used for providing a working power supply.
The full-wave rectification module is connected with an alternating current power supply and used for performing full-wave rectification on an alternating current power supply signal to obtain a pulsating direct current waveform signal. The full-wave rectification module comprises a first full-wave rectification tube D2 and a second full-wave rectification tube D5, and the first full-wave rectification tube D2 and the second full-wave rectification tube D5 are both rectification diodes. A first end (positive pole) of the first full-wave rectifier D2 is connected to a live line L (i.e., node a) of the ac power supply, a first end (positive pole) of the second full-wave rectifier D5 is connected to a neutral line N (i.e., node B) of the ac power supply, and a second end (negative pole) of the first full-wave rectifier D2 and a second end (negative pole) of the second full-wave rectifier D5 are connected together to form an output terminal of the full-wave rectifier module.
The output end of the full-wave rectification module is connected to the filtering module after passing through the voltage division module. The voltage division module comprises a voltage division resistor R2.
The filtering module is connected with the output of the full-wave rectification module through the voltage division module and is used for filtering the pulsating direct-current waveform signal. The filter wave module comprises a filter capacitor C1, one end of the filter capacitor C1 is connected with the output side (namely the output side after passing through the voltage division module) of the full-wave rectification module and the input side of the output module, and the other end of the filter capacitor C1 is grounded.
The output module is connected with the filtering module and used for outputting a pulse waveform signal for zero-crossing detection based on the filtered pulsating direct current waveform signal. The output module comprises a switch tube Q1 and a pull-up resistor R1, and the switch tube Q1 is a triode. The base of the switch tube Q1 is connected with the filter module, i.e. the filter capacitor C1, the pull-up resistor R1 is connected between the working power supply VCC3.3V and the collector of the switch tube Q1, the emitter of the switch tube Q1 is grounded, and the collector of the switch tube Q1 forms the output end of the output circuit. The working power VCC connected with the pull-up resistor R1 is provided by the full-bridge rectification module, i.e., one end of the pull-up resistor R1 is connected with the full-bridge rectification module.
The zero-crossing detection circuit further comprises a reverse protection diode D6 used for clamping the BE junction voltage of the switching tube Q1, the positive electrode of the reverse protection diode D6 is grounded, and the negative electrode of the reverse protection diode D6 is connected with the base electrode of the switching tube Q1. The reverse protection diode D6 has a resistor R3 connected in parallel across its terminals.
The zero-crossing detection device based on the zero-crossing detection circuit comprises the zero-crossing detection circuit and an MCU (microprogrammed control unit) which is connected with the zero-crossing detection circuit and carries out zero-crossing detection based on a pulse waveform signal to obtain a detection result.
The working principle of the zero-crossing detection circuit and the zero-crossing detection device is as follows:
the first full-wave rectifier tube D2 and the second full-wave rectifier tube D5 are taken from two points A and B, full-wave rectification is carried out through the first full-wave rectifier tube D2 and the second full-wave rectifier tube D5 to form pulsating direct-current waveform signals, voltage division is carried out through the resistor R2, filtering is carried out through the capacitor C1, high-frequency components are filtered, and C-point voltage waveforms are formed. When the voltage at the point C is greater than 0.7V, the triode Q1 is conducted, and a low level is formed at the collector of the triode Q1; when the voltage of the point C is lower than 0.7V, the triode Q1 is cut off, the collector of the triode Q1 forms a high level through the pull-up resistor R1, the triode Q1 is repeatedly switched on and cut off, a 100HZ pulse waveform signal is formed at the chip zero-crossing detection port D, and the MCU can detect the zero point of the voltage by judging the high and low levels.
Diode D6 acts as a reverse protection diode for transistor Q1 and clamps the voltage at the BE junction of transistor Q1. In addition, when the reverse voltage at the BE junction of transistor Q1 is greater than the turn-on voltage of diode D6, diode D6 will conduct, clamping the BE junction of transistor Q1 to a fixed voltage level.
The zero-crossing detection circuit has the advantages of simple structure, low cost and high reliability, and is suitable for high-power circuits.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (10)
1. A zero-crossing detection circuit, characterized by: the zero-cross detection circuit includes:
the full-wave rectification module is connected with the alternating current power supply and is used for performing full-wave rectification on an alternating current power supply signal to obtain a pulsating direct current waveform signal;
the filtering module is connected with the full-wave rectification module and is used for filtering the pulsating direct-current waveform signal;
and the output module is connected with the filtering module and outputs a pulse waveform signal for zero-crossing detection based on the filtered pulsating direct current waveform signal.
2. A zero-crossing detection circuit as claimed in claim 1, wherein: the zero-crossing detection circuit further comprises a voltage division module connected between the full-wave rectification module and the filtering module.
3. A zero-crossing detection circuit as claimed in claim 1, wherein: the full-wave rectification module comprises a first full-wave rectification tube and a second full-wave rectification tube, the first end of the first full-wave rectification tube is connected with a live wire of the alternating current power supply, the first end of the second full-wave rectification tube is connected with a zero line of the alternating current power supply, and the second end of the first full-wave rectification tube and the second end of the second full-wave rectification tube are connected with the filtering module after being connected in a common mode.
4. A zero-crossing detection circuit as claimed in claim 3, wherein: the first full-wave rectifying tube and the second full-wave rectifying tube are both rectifying diodes.
5. A zero-crossing detection circuit as claimed in claim 1, wherein: the filter module comprises a filter capacitor, one end of the filter capacitor is connected with the input side of the output module, and the other end of the filter capacitor is grounded.
6. A zero-crossing detection circuit as claimed in claim 1, wherein: the output module comprises a switch tube and a pull-up resistor, the base electrode of the switch tube is connected with the filtering module, the pull-up resistor is connected between a working power supply and the collector electrode of the switch tube, the emitting electrode of the switch tube is grounded, and the collector electrode of the switch tube forms the output end of the output module.
7. A zero-crossing detection circuit as claimed in claim 6, wherein: the zero-crossing detection circuit further comprises a reverse protection diode used for clamping BE junction voltage of the switching tube, the anode of the reverse protection diode is grounded, and the cathode of the reverse protection diode is connected with the base electrode of the switching tube.
8. A zero-crossing detection circuit as claimed in claim 6, wherein: the zero-crossing detection circuit further comprises a full-bridge rectification module which is respectively connected with the alternating current power supply and the output module and used for providing the working power supply.
9. A zero-crossing detection circuit as claimed in claim 1, wherein: and the live wire of the alternating current power supply is connected with a fuse.
10. A zero-crossing detection system, characterized by: the zero-crossing detection system comprises a zero-crossing detection circuit according to any one of claims 1 to 9 and an MCU connected with the zero-crossing detection circuit and performing zero-crossing detection based on the pulse waveform signal to obtain a detection result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020904240.5U CN212675022U (en) | 2020-05-26 | 2020-05-26 | Zero-crossing detection circuit and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020904240.5U CN212675022U (en) | 2020-05-26 | 2020-05-26 | Zero-crossing detection circuit and system |
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| Publication Number | Publication Date |
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| CN212675022U true CN212675022U (en) | 2021-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020904240.5U Active CN212675022U (en) | 2020-05-26 | 2020-05-26 | Zero-crossing detection circuit and system |
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| CN (1) | CN212675022U (en) |
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- 2020-05-26 CN CN202020904240.5U patent/CN212675022U/en active Active
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