CN110579639B - Mains supply zero-crossing detection circuit and switch power supply system using same - Google Patents
Mains supply zero-crossing detection circuit and switch power supply system using same Download PDFInfo
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- CN110579639B CN110579639B CN201910948032.7A CN201910948032A CN110579639B CN 110579639 B CN110579639 B CN 110579639B CN 201910948032 A CN201910948032 A CN 201910948032A CN 110579639 B CN110579639 B CN 110579639B
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- 238000001514 detection method Methods 0.000 title claims abstract description 49
- 230000005669 field effect Effects 0.000 claims description 25
- 238000004804 winding Methods 0.000 claims description 23
- 238000005070 sampling Methods 0.000 claims description 19
- 239000003990 capacitor Substances 0.000 claims description 16
- 230000005540 biological transmission Effects 0.000 claims description 10
- 239000004065 semiconductor Substances 0.000 claims description 3
- 229910044991 metal oxide Inorganic materials 0.000 claims description 2
- 150000004706 metal oxides Chemical class 0.000 claims description 2
- 230000000007 visual effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
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Abstract
The invention discloses a mains supply zero-crossing detection circuit and a switching power supply system applying the same, wherein the circuit comprises a diode, a zero-crossing voltage clamping circuit and a zero-crossing comparison circuit which are connected in sequence; the positive electrode of the diode is used as the input end of the whole mains supply zero-crossing detection circuit to be electrically connected with the AC input, the negative electrode of the diode is electrically connected with the positive end of the zero-crossing voltage clamping circuit, the negative end of the zero-crossing voltage clamping circuit is electrically connected with the input end of the zero-crossing comparison circuit, and the output end of the zero-crossing comparison circuit is electrically connected with a control device in the switching power supply system or directly used as zero-crossing output and zero-crossing signal output. The circuit integrally consists of a diode, a zero-crossing voltage clamping circuit and a zero-crossing comparison circuit, has a simple and visual circuit structure, is common and easily obtained in used components, has low overall setting cost and power consumption, and is very suitable for large-scale popularization.
Description
Technical Field
The invention relates to a detection circuit, in particular to a mains supply zero-crossing detection circuit and a switching power supply system applying the same, and belongs to the technical field of power semiconductors.
Background
Nowadays, with the continuous development of electronic power technology and the continuous improvement of industrial manufacturing level, various household appliances such as refrigerators, dish washers, microwave ovens and the like which are common in people's life become more and more intelligent, and various functions are increasingly abundant. Accordingly, as one of the structural bases of these electric appliances, switching power supply technology has been widely used.
Taking the mains supply zero-crossing detection circuit needed in the use process of the household appliance as an example, the circuit is mainly used for detecting a power frequency power supply, thereby achieving the purposes of timing or protecting the household appliance. In the prior art, a control system of the household appliance adopts a non-isolated mains supply zero-crossing detection circuit, and a triode or a comparator is generally included in the circuit.
However, in the practical application of this type of circuit, in order to improve the anti-interference level of the whole circuit, the control system preferably needs to use an isolation system to isolate the strong current from the weak current. Therefore, if the system involves the mains supply zero-crossing signal, an isolated mains supply zero-crossing detection circuit is required to be designed, and the existing non-isolated mains supply zero-crossing detection circuit can only be realized by an external optical coupler to realize the function of isolated mains supply zero-crossing detection, and finally the obtained isolated mains supply zero-crossing detection circuit consists of a current limiting resistor, an optical coupler, output and the like. Although the scheme can realize the function of certain isolated mains supply zero-crossing detection, the scheme has the advantages of more components, high scheme cost, low reliability and higher power consumption of the zero-crossing detection part.
Based on the above-mentioned shortcomings in the prior art, how to provide a mains supply zero-crossing detection circuit suitable for a switching power supply system based on the prior art to overcome the above-mentioned problems is also a problem to be solved by technicians in the industry at present.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention provides a mains supply zero-crossing detection circuit and a switching power supply system using the same, which are specifically as follows.
A mains supply zero-crossing detection circuit comprises a diode, a zero-crossing voltage clamping circuit and a zero-crossing comparison circuit which are connected in sequence;
the positive electrode of the diode is used as the input end of the whole mains supply zero-crossing detection circuit to be electrically connected with the AC input, the negative electrode of the diode is electrically connected with the positive end of the zero-crossing voltage clamping circuit, the negative end of the zero-crossing voltage clamping circuit is electrically connected with the input end of the zero-crossing comparison circuit, and the output end of the zero-crossing comparison circuit is electrically connected with a control device in the switching power supply system or directly used as zero-crossing output and zero-crossing signal output.
Preferably, the whole mains supply zero-crossing detection circuit is applied to a switching power supply system with a flyback topological structure, and the switching power supply system is an isolated switching power supply system or a non-isolated switching power supply system.
Preferably, the zero-crossing voltage clamping circuit is a single junction field effect transistor;
the drain electrode of the junction field effect transistor is used as the positive end of the zero-crossing voltage clamping circuit, the source electrode of the junction field effect transistor is used as the negative end of the zero-crossing voltage clamping circuit, and the grid electrode of the junction field effect transistor is grounded.
Preferably, the zero-crossing voltage clamping circuit consists of a junction field effect transistor and an NMOS (N-channel metal oxide semiconductor) transistor;
the drain electrode of the junction field effect transistor is used as the positive end of the zero-crossing voltage clamping circuit, the source electrode of the junction field effect transistor is electrically connected with the drain electrode of the NMOS transistor, the grid electrode of the junction field effect transistor is grounded, the source electrode of the NMOS transistor is used as the negative end of the zero-crossing voltage clamping circuit, and the grid electrode of the NMOS transistor is electrically connected with the control device.
Preferably, the zero-crossing comparison circuit is a single voltage comparator;
the negative end of the voltage comparator is used as the input end of the zero-crossing comparison circuit, the positive end of the voltage comparator is electrically connected with the internal reference of the control device, and the output end of the voltage comparator is used as the output end of the zero-crossing comparison circuit.
Preferably, the zero-crossing comparison circuit is composed of a voltage dividing resistor string and a voltage comparator;
one end of the voltage dividing resistor is used as an input end of the zero-crossing comparison circuit, the other end of the voltage dividing resistor is grounded, a voltage dividing point of the voltage dividing resistor is electrically connected with a negative end of the voltage comparator, a positive end of the voltage comparator is electrically connected with an internal reference of the control device, and an output end of the voltage comparator is used as an output end of the zero-crossing comparison circuit.
Preferably, the zero-crossing comparison circuit is composed of a resistor, a diode and a current comparator;
one end of the resistor is used as an input end of the zero-crossing comparison circuit, the other end of the resistor is electrically connected with the anode of the diode, the cathode of the diode is electrically connected with the cathode of the current comparator, the anode of the current comparator is electrically connected with the internal reference of the control device, and the output end of the current comparator is used as an output end of the zero-crossing comparison circuit.
The switching power supply system comprises the mains supply zero-crossing detection circuit, a rectifying device, an input capacitor, a clamping circuit, an energy transmission device, a rectifying diode, an output capacitor, a sampling circuit, a load, a power switching device and a control device, wherein the control device is a control chip;
the rectifying device is electrically connected with the energy transmission device, the energy transmission device is a double-winding and comprises a primary winding and a primary winding, the primary winding is respectively electrically connected with the input capacitor, the clamping circuit and the power switch device, the secondary winding is electrically connected with the positive electrode of the rectifying diode, and the negative electrode of the rectifying diode is respectively electrically connected with the output capacitor and the load;
the rectifying device is also electrically connected with the input end of the mains supply zero-crossing detection circuit, and the output end of the mains supply zero-crossing detection circuit is electrically connected with the control chip.
Preferably, the sampling circuit is electrically connected with the control chip, the sampling circuit and the control chip can be in an integrated structure or two independent devices, and the sampling circuit can be an optocoupler, a capacitor, a magneto-coupler or a divider resistor.
Preferably, the sampling circuit receives an output signal in the system, then generates a feedback signal and sends the feedback signal to the control chip, wherein the feedback signal can be a voltage signal or a current signal.
Compared with the prior art, the invention has the advantages that:
the mains supply zero-crossing detection circuit provided by the invention is integrally composed of the diode, the zero-crossing voltage clamping circuit and the zero-crossing comparison circuit, the circuit structure is simple and visual, the used components are common and easy to obtain, the components can be directly integrated in the control chip, and the overall setting cost of the circuit is low. And because of the existence of the zero-crossing voltage clamping circuit, the power consumption of the whole circuit is greatly reduced, and the circuit is very suitable for large-scale popularization of enterprises.
The mains supply zero-crossing detection circuit is applied to a switching power supply system, the whole switching power supply system can be effectively optimized, the system structure is simplified, the reliability of the system is improved, and the failure rate of the system is reduced.
In addition, the invention also provides reference for other related schemes in the same field, can be used for expanding and extending based on the reference, is applied to the design schemes of other zero-crossing detection circuits in the same field, and has very wide application prospect.
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings, so that the technical scheme of the present invention can be understood and mastered more easily.
Drawings
Fig. 1 is a schematic diagram of a switching power supply system to which the mains zero-crossing detection circuit of the present invention is applied.
Fig. 2 is a schematic diagram of a mains supply zero-crossing detection circuit in the present invention.
Fig. 3 is a timing diagram of the mains zero crossing detection circuit according to the present invention.
Fig. 4 is a schematic structural diagram of another embodiment of the mains zero-crossing detection circuit according to the present invention.
Fig. 5 is a schematic structural diagram of a mains zero-crossing detection circuit according to another embodiment of the present invention.
Detailed Description
The invention discloses a mains supply zero-crossing detection circuit which can be integrated in a control chip and has high reliability, low system manufacturing cost and low power consumption, and a switching power supply system applying the circuit.
As shown in fig. 1 to 5, a mains supply zero-crossing detection circuit includes a diode 101, a zero-crossing voltage clamp circuit 102, and a zero-crossing comparison circuit 103 connected in sequence.
The positive electrode of the diode 101 is electrically connected with the AC input as the input end of the whole mains supply zero-crossing detection circuit, the negative electrode of the diode 101 is electrically connected with the positive end of the zero-crossing voltage clamping circuit 102, the negative end of the zero-crossing voltage clamping circuit 102 is electrically connected with the input end of the zero-crossing comparison circuit 103, and the output end of the zero-crossing comparison circuit 103 is electrically connected with a control device in the switching power supply system or directly used as a zero-crossing output and zero-crossing signal.
It should be noted that the whole mains supply zero-crossing detection circuit is applied to a switch power supply system with a flyback topology structure, and the switch power supply system is an isolated switch power supply system or a non-isolated switch power supply system.
In this embodiment, the zero-crossing voltage clamping circuit 102 and the zero-crossing comparison circuit 103 are selected in a number of ways, which is illustrated below.
As shown in fig. 2 or 5, the zero crossing voltage clamp 102 may be a single junction field effect transistor. In this solution, the drain electrode of the junction field effect transistor is used as the positive terminal of the zero-crossing voltage clamping circuit 102, the source electrode of the junction field effect transistor is used as the negative terminal of the zero-crossing voltage clamping circuit 102, and the gate electrode of the junction field effect transistor is grounded.
As shown in fig. 4, the zero-crossing voltage clamping circuit 102 may also be composed of a junction field effect transistor and an NMOS transistor, where the junction field effect transistor and the NMOS transistor are connected in series. In this scheme, the drain electrode of the junction field effect transistor is used as the positive end of the zero-crossing voltage clamping circuit 102, the source electrode of the junction field effect transistor is electrically connected with the drain electrode of the NMOS transistor, the gate electrode of the junction field effect transistor is grounded, the source electrode of the NMOS transistor is used as the negative end of the zero-crossing voltage clamping circuit 102, and the gate electrode of the NMOS transistor is electrically connected with the control device.
The zero crossing comparison circuit 103 may be a single voltage comparator. In this embodiment, the negative terminal of the voltage comparator is used as the input terminal of the zero-crossing comparison circuit 103, the positive terminal of the voltage comparator is electrically connected to the control device, i.e., the internal reference of the control chip 10, and the output terminal of the voltage comparator is used as the output terminal of the zero-crossing comparison circuit 103.
As shown in fig. 2 or fig. 4, the zero-crossing comparison circuit 103 may also be composed of a voltage dividing resistor string and a voltage comparator. In this scheme, one end of the voltage dividing resistor is used as an input end of the zero-crossing comparison circuit 103, the other end of the voltage dividing resistor is grounded, a voltage dividing point of the voltage dividing resistor is electrically connected with a negative end of the voltage comparator, a positive end of the voltage comparator is electrically connected with the control device, that is, an internal reference of the control chip 10, and an output end of the voltage comparator is used as an output end of the zero-crossing comparison circuit 103.
As shown in fig. 5, the zero-crossing comparison circuit 103 may further include a resistor, a diode, and a current comparator. In this solution, one end of the resistor is used as an input end of the zero-crossing comparison circuit 103, the other end of the resistor is electrically connected to an anode of the diode, a cathode of the diode is electrically connected to a cathode of the current comparator, an anode of the current comparator is electrically connected to the control device, that is, an internal reference of the control chip 10, and an output end of the current comparator is used as an output end of the zero-crossing comparison circuit 103.
As shown in fig. 1, the invention also discloses a switching power supply system, which comprises the mains supply zero-crossing detection circuit, and further comprises a rectifying device 2, an input capacitor Cf 3, a clamping circuit 4, an energy transmission device T1 5, a rectifying diode D1 6, an output capacitor Co, a sampling circuit 7, a load 8, a power switching device S1 9, a control device and the like, wherein the control device is a control chip 10.
The switching power supply system is a flyback topology system, but it should be noted that the flyback topology is only one of the switching power supply topologies to which the mains zero-crossing detection circuit is applicable. In addition, the switching power supply system shown in fig. 1 is an isolated switching power supply system, and the mains supply zero-crossing detection circuit can also be applied to a non-isolated switching power supply system.
The switching power supply system may provide an ac voltage input to the load 8 with output power. For example, the input voltage may be an ac input voltage Vac.
The rectifying device 2 may be a rectifying bridge or a single-bridge rectifying circuit. The rectifying device 2 is electrically connected to the energy transmission device T1 5, and in the embodiment of the present invention, the energy transmission device T1 5 is a double winding including a primary winding 501 and a secondary winding 502. In other embodiments (including non-isolated switching power supply systems), the energy transfer device T1 5 may be a further winding or a transformer.
The primary winding 501 is electrically connected to the power switch device S1 9. The clamping circuit 4 is connected in parallel to two ends of the primary winding 112, and the input capacitor Cf 3 is also electrically connected to the primary winding 501.
The secondary winding 502 is electrically connected with the anode of the rectifying diode D1 6; the output capacitor Co and the load 8 are respectively and electrically connected with the cathode of the rectifying diode D1 6.
The output of the switching power supply system is Direct Current (DC) output. In fig. 1, the output signal Uo reflects the output, and the output signal Uo may reflect the output voltage Vo and also the output current Io. The sampling circuit 7 is coupled to the received output signal Uo and generates a feedback signal Ufb reflecting the variation of the output signal Uo. The feedback signal Ufb may be a voltage signal or a current signal. In some embodiments, the sampling circuit may additionally add a winding to the energy transfer device T1 5 to sample the output signal Uo.
The sampling circuit 7 is electrically connected with the control chip 10, and the sampling circuit 7 and the control chip 10 can be in an integrated structure or two independent devices, such as an optocoupler, a capacitor and a magnetic coupler, which can be used as the sampling circuit 7 to generate signals and feed the signals back to the control chip 10. In some embodiments, a voltage dividing resistor may also be used as the sampling circuit 7 to feed back the output signal Uo of the switching power supply system to the control chip 10.
Further, in the switching power supply system, the energy transmission device T1 5 transmits energy between the primary winding 501 and the secondary winding 502. In order to limit the highest voltage of the power switching device S1 9, the clamping circuit 4 is connected in parallel with the primary winding 501. The switching of the power switching device S1 9 is controlled by a driving signal. The switching of the power switching device S1 9 produces a fluctuating current on the rectifying diode D1 6, which is filtered by the output capacitor Co, thus producing a stable dc output voltage Vo, or a stable dc output current Io.
The output signal Uo of the switching power supply system is sampled by the sampling circuit 7 to generate a feedback signal Ufb and is transferred to the control chip 10. The feedback signal Ufb may be a voltage signal or a current signal. The feedback signal Ufb conveys information of the output signal Uo to the control chip 10. In addition, the control chip 10 receives a current sampling signal representing the switching current Id generated by the power switching device S1 9 and the input current. The switching current Id may be sampled in a number of ways. For example, the switching current Id may be voltage sampled through a discrete resistor or voltage differential sampled through a conductive transistor. The control chip 10 outputs a driving signal to control the power switching device S1 9, so as to ensure that the output signal Uo is a set value.
FIG. 3 is a schematic diagram of the waveforms of the operation of the zero-crossing detection circuit of FIG. 2, as shown in waveform V AC The waveform V is generated after passing through a diode for the waveform of the input end of the whole mains supply zero-crossing detection circuit D ，V D After passing through the zero-crossing voltage clamping circuit, waveform V is generated JEFT ，V JFET And then the zero-crossing comparison circuit generates a zero-crossing signal. The zero crossing signal generated by the circuit can be directly output or can be input into a control chip for further processing.
In general, the mains supply zero-crossing detection circuit provided by the invention is integrally composed of a diode, a zero-crossing voltage clamping circuit and a zero-crossing comparison circuit, the circuit structure is simple and visual, the used components are common and easy to obtain and can be directly integrated in a control chip, and the overall setting cost of the circuit is low. And because of the existence of the zero-crossing voltage clamping circuit, the power consumption of the whole circuit is greatly reduced, and the circuit is very suitable for large-scale popularization of enterprises.
The mains supply zero-crossing detection circuit is applied to a switching power supply system, the whole switching power supply system can be effectively optimized, the system structure is simplified, the reliability of the system is improved, and the failure rate of the system is reduced.
In addition, the invention also provides reference for other related schemes in the same field, can be used for expanding and extending based on the reference, is applied to the design schemes of other zero-crossing detection circuits in the same field, and has very wide application prospect.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (5)
1. A mains supply zero crossing detection circuit is characterized in that: the whole mains supply zero-crossing detection circuit is applied to a switching power supply system with a flyback topological structure and comprises a diode (101), a zero-crossing voltage clamping circuit (102) and a zero-crossing comparison circuit (103) which are connected in sequence;
the positive electrode of the diode (101) is used as the input end of the whole mains supply zero-crossing detection circuit to be electrically connected with the AC input, the negative electrode of the diode (101) is electrically connected with the positive end of the zero-crossing voltage clamping circuit (102), the negative end of the zero-crossing voltage clamping circuit (102) is electrically connected with the input end of the zero-crossing comparison circuit (103), and the output end of the zero-crossing comparison circuit (103) is electrically connected with a control device in the switching power supply system or directly used as zero-crossing output and zero-crossing signal;
the zero-crossing voltage clamping circuit (102) is a single junction field effect transistor, the drain electrode of the junction field effect transistor is used as the positive end of the zero-crossing voltage clamping circuit (102), the source electrode of the junction field effect transistor is used as the negative end of the zero-crossing voltage clamping circuit (102), and the grid electrode of the junction field effect transistor is grounded;
or the zero-crossing voltage clamping circuit (102) consists of a junction field effect transistor and an NMOS (N-channel metal oxide semiconductor) transistor; the drain electrode of the junction field effect transistor is used as the positive end of the zero-crossing voltage clamping circuit (102), the source electrode of the junction field effect transistor is electrically connected with the drain electrode of the NMOS transistor, the grid electrode of the junction field effect transistor is grounded, the source electrode of the NMOS transistor is used as the negative end of the zero-crossing voltage clamping circuit (102), and the grid electrode of the NMOS transistor is electrically connected with the control device;
the zero-crossing comparison circuit (103) is a single voltage comparator, the negative end of the voltage comparator is used as the input end of the zero-crossing comparison circuit (103), the positive end of the voltage comparator is electrically connected with the internal reference of the control device, and the output end of the voltage comparator is used as the output end of the zero-crossing comparison circuit (103);
alternatively, the zero-crossing comparison circuit (103) is composed of a voltage dividing resistor string and a voltage comparator; one end of a voltage dividing resistor is used as an input end of the zero-crossing comparison circuit (103), the other end of the voltage dividing resistor is grounded, a voltage dividing point of the voltage dividing resistor is electrically connected with a negative end of the voltage comparator, a positive end of the voltage comparator is electrically connected with an internal reference of the control device, and an output end of the voltage comparator is used as an output end of the zero-crossing comparison circuit (103);
alternatively, the zero-crossing comparison circuit (103) is composed of a resistor, a diode and a current comparator; one end of a resistor is used as an input end of the zero-crossing comparison circuit (103), the other end of the resistor is electrically connected with the anode of the diode, the cathode of the diode is electrically connected with the cathode of the current comparator, the anode of the current comparator is electrically connected with an internal reference of the control device, and the output end of the current comparator is used as an output end of the zero-crossing comparison circuit (103).
2. The mains zero-crossing detection circuit of claim 1, wherein: the switching power supply system is an isolated switching power supply system or a non-isolated switching power supply system.
3. A switching power supply system comprising the mains zero crossing detection circuit of claim 1, characterized in that: the power supply device further comprises a rectifying device (2), an input capacitor Cf (3), a clamping circuit (4), an energy transmission device T1 (5), a rectifying diode D1 (6), an output capacitor Co, a sampling circuit (7), a load (8), a power switching device S1 (9) and a control device, wherein the control device is a control chip (10);
the rectifying device (2) is electrically connected with the energy transmission device T1 (5), the energy transmission device T1 (5) is a double-winding, the double-winding comprises a primary winding (501) and a primary winding (502), the primary winding (501) is electrically connected with the input capacitor Cf (3), the clamping circuit (4) and the power switching device S1 (9) respectively, the secondary winding is electrically connected with the positive electrode of the rectifying diode D1 (6), and the negative electrode of the rectifying diode D1 (6) is electrically connected with the output capacitor Co and the load (8) respectively;
the rectifying device (2) is also electrically connected with the input end of the mains supply zero-crossing detection circuit, and the output end of the mains supply zero-crossing detection circuit is electrically connected with the control chip (10).
4. A switching power supply system according to claim 3, characterized in that: the sampling circuit (7) is electrically connected with the control chip (10), and the sampling circuit (7) and the control chip can be of an integrated structure or two independent devices, and the sampling circuit (7) can be an optocoupler, a capacitor, a magneto coupler or a divider resistor.
5. The switching power supply system according to claim 4, wherein: the sampling circuit (7) receives an output signal in the system, generates a feedback signal and sends the feedback signal to the control chip (10), wherein the feedback signal can be a voltage signal or a current signal.
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| CN201910948032.7A CN110579639B (en) | 2019-10-08 | 2019-10-08 | Mains supply zero-crossing detection circuit and switch power supply system using same |
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| CN201910948032.7A CN110579639B (en) | 2019-10-08 | 2019-10-08 | Mains supply zero-crossing detection circuit and switch power supply system using same |
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| CN110579639B true CN110579639B (en) | 2024-04-02 |
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| CN112345821B (en) * | 2020-10-10 | 2023-03-21 | 无锡芯朋微电子股份有限公司 | Commercial power voltage detection circuit and switch power supply system using same |
| CN112462131B (en) * | 2020-11-05 | 2024-04-02 | 无锡芯朋微电子股份有限公司 | Mains supply zero-crossing detection circuit and non-isolated power supply system using same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20130084199A (en) * | 2012-01-16 | 2013-07-24 | 단국대학교 산학협력단 | Single power stage power factor correction circuit |
| WO2014198172A1 (en) * | 2013-06-09 | 2014-12-18 | 中兴通讯股份有限公司 | Current zero-cross detection device, signal acquisition circuit, and circuit system |
| CN104578722A (en) * | 2014-12-30 | 2015-04-29 | 上海贝岭股份有限公司 | Zero cross detection circuit of inductive current in power switch chip |
| CN106841762A (en) * | 2017-02-08 | 2017-06-13 | 广东美的厨房电器制造有限公司 | Zero cross detection circuit and home appliance |
| CN211741405U (en) * | 2019-10-08 | 2020-10-23 | 苏州博创集成电路设计有限公司 | Commercial power zero-crossing detection circuit and switching power supply system using same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8198882B2 (en) * | 2009-05-21 | 2012-06-12 | Hungkuang University | Power converting device with high power transformation efficiency |
| JP2019176605A (en) * | 2018-03-28 | 2019-10-10 | Tdk株式会社 | Zero current detection circuit for bridgeless totem-pole power factor improving converter, and bridgeless totem-pole power factor improving converter |
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| KR20130084199A (en) * | 2012-01-16 | 2013-07-24 | 단국대학교 산학협력단 | Single power stage power factor correction circuit |
| WO2014198172A1 (en) * | 2013-06-09 | 2014-12-18 | 中兴通讯股份有限公司 | Current zero-cross detection device, signal acquisition circuit, and circuit system |
| CN104578722A (en) * | 2014-12-30 | 2015-04-29 | 上海贝岭股份有限公司 | Zero cross detection circuit of inductive current in power switch chip |
| CN106841762A (en) * | 2017-02-08 | 2017-06-13 | 广东美的厨房电器制造有限公司 | Zero cross detection circuit and home appliance |
| CN211741405U (en) * | 2019-10-08 | 2020-10-23 | 苏州博创集成电路设计有限公司 | Commercial power zero-crossing detection circuit and switching power supply system using same |
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