CN112345821B - Commercial power voltage detection circuit and switch power supply system using same - Google Patents
Commercial power voltage detection circuit and switch power supply system using same Download PDFInfo
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- CN112345821B CN112345821B CN202011075684.3A CN202011075684A CN112345821B CN 112345821 B CN112345821 B CN 112345821B CN 202011075684 A CN202011075684 A CN 202011075684A CN 112345821 B CN112345821 B CN 112345821B
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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
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a mains supply voltage detection circuit and a switching power supply system applying the same, wherein the whole circuit is electrically connected with an external AC input by virtue of a diode and consists of a mains supply voltage conversion circuit, a carrier generation circuit and a modulation circuit; the utility voltage conversion circuit and the carrier generation circuit are arranged in parallel, the input ends of the utility voltage conversion circuit and the carrier generation circuit are electrically connected and jointly used as the input end of the whole utility voltage detection circuit, the output ends of the utility voltage conversion circuit and the carrier generation circuit are electrically connected with the input end of the modulation circuit, and the output end of the modulation circuit is used as the output end of the whole utility voltage detection circuit. The invention has excellent use effect and simple and visual structure, and greatly reduces the setting cost while improving the use effect.
Description
Technical Field
The invention relates to a detection circuit and a switching power supply applying the same, in particular to a mains supply voltage detection circuit and a switching power supply system applying the same, and belongs to the technical field of power semiconductors.
Background
The switch power supply is used as the structure foundation of various electric mechanisms and devices and has wide application. In addition, in recent years, electronic power technology and industrial manufacturing are continuously developed and improved, and the technology of the switching power supply is also advanced.
Taking common mains supply voltage detection circuits in various electrical mechanisms and devices as examples, the circuits are mainly used for detecting a power frequency power supply, so that the aim of adjusting the output power of a system to match the current mains supply input voltage is fulfilled.
In the prior art, an isolated mains voltage detection circuit is used in a control system of various household appliances, and the circuit uses a mutual inductor to transmit the current mains voltage to a single-chip microcomputer which outputs the current mains voltage at the secondary side so as to adjust the output power.
However, in the practical application process of such circuits, in order to improve the overall anti-interference level of the circuit, the precision requirement on the mutual inductor in the circuit is extremely high. Meanwhile, as the mutual inductor transmits analog voltage signals, the signals need to occupy internal resources after being input into the single-chip microcomputer, convert the analog signals into digital signals and then perform subsequent processing.
In summary, although the existing scheme can achieve a certain function of detecting the mains voltage, the used transformer has a large volume and a high cost, which is contrary to the overall miniaturization development trend of the system, and the scheme has the advantages of large resource occupation in the system, high scheme cost and low reliability.
Because of the above-mentioned shortcomings in the prior art, how to provide a commercial power voltage detection circuit suitable for a switching power supply system based on the prior art to overcome the above-mentioned problems is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a mains voltage detection circuit and a switching power supply system using the same, which are described in detail below.
A commercial power voltage detection circuit is composed of a commercial power voltage conversion circuit, a carrier generation circuit and a modulation circuit;
the utility power voltage conversion circuit and the carrier generation circuit are arranged in parallel, the input ends of the utility power voltage conversion circuit and the carrier generation circuit are electrically connected and jointly used as the input end of the whole utility power voltage detection circuit, the output ends of the utility power voltage conversion circuit and the carrier generation circuit are electrically connected with the input end of the modulation circuit, and the output end of the modulation circuit is used as the output end of the whole utility power voltage detection circuit;
the input end of the whole mains supply voltage detection circuit is electrically connected with an external AC input by means of a diode, the anode of the diode is electrically connected with the AC input, and the cathode of the diode is electrically connected with the input ends of the mains supply voltage conversion circuit and the carrier generation circuit respectively.
Preferably, the carrier generation circuit at least includes any one of a mains zero-crossing detection circuit and a mains chopper circuit.
Preferably, the output end of the mains voltage conversion circuit is electrically connected with the input end of the modulation circuit, and outputs a sampling signal to the modulation circuit; the output end of the carrier generation circuit is electrically connected with the input end of the modulation circuit and outputs a carrier signal to the modulation circuit.
Preferably, the output end of the modulation circuit is electrically connected to an external functional device, and generates an output signal containing the carrier signal information to the functional device.
Preferably, the modulation circuit is configured to modulate a pulse width of the carrier signal or modulate a driving current of the carrier signal;
the output signal of the modulation circuit is a modulated carrier signal.
Preferably, the mains voltage conversion circuit is composed of a mains voltage sampling circuit and an analog-to-digital conversion circuit which are connected in sequence;
the sampling mode of the mains supply voltage sampling circuit is voltage sampling or current sampling;
the analog-to-digital conversion circuit is a decoder or a current comparator or a voltage comparator.
A switch power supply system comprises the mains voltage detection circuit, and is an isolated switch power supply system with a flyback topology structure.
A switching power supply system further comprises a rectifying device, an input capacitor Cf, an energy transmission device T1, a rectifying diode D1, an output capacitor Co, a load, an output power adjusting module, a demodulation chip and an isolating device;
one output end of the rectifying device is electrically connected with the input end of the mains voltage detection circuit by virtue of a diode, and the other output end of the rectifying device is electrically connected with the energy transmission device T1;
the energy transmission device T1 is a double-winding structure comprising a primary winding and a secondary winding, the primary winding is electrically connected with one end of the input capacitor Cf, the other end of the input capacitor Cf is grounded, and the secondary winding is electrically connected with the anode of the rectifier diode D1;
the output end of the commercial power voltage detection circuit is electrically connected with the input end of the isolation device, the output end of the isolation device is electrically connected with the input end of the demodulation chip, the output end of the demodulation chip is electrically connected with the input end of the output power adjustment module, and the output end of the output power adjustment module is respectively electrically connected with the negative electrode of the rectifier diode D1, the output capacitor Co and the load.
Preferably, the power supply further comprises a power supply control chip, wherein the power supply control chip is electrically connected with the primary winding and is used for receiving an output feedback signal Uo in a system, and the output feedback signal Uo is a voltage signal or a current signal;
the mains supply voltage detection circuit is independently arranged or integrally arranged inside the power control chip.
Preferably, the output end of the demodulation chip is not communicated with the input end of the mains voltage detection circuit, and no signal is fed back to the mains voltage detection circuit.
Preferably, the rectifier device is a rectifier bridge or a single-bridge rectifier circuit; the isolation device is an optical coupler or an isolation capacitor or a mutual inductor; the demodulation chip is a single-chip microcomputer.
Compared with the prior art, the invention has the advantages that:
the mains supply voltage detection circuit provided by the invention integrally comprises a mains supply voltage conversion circuit, a carrier generation circuit and a modulation circuit, the circuit structure is simple and visual, each part and each component used by the circuit are common and easily-obtained existing products and can be directly integrated in a control chip, and the setting cost of the whole circuit is greatly reduced.
Meanwhile, due to the existence of the modulation circuit, the zero-crossing signal is used as the carrier wave to transmit the commercial power voltage digital signal while the commercial power zero-crossing signal is transmitted, so that the scheme cost is reduced, excessive occupation of internal resources of a demodulation chip in a system is avoided, the utilization rate of the resources is optimized to the maximum extent, and the modulation circuit is very suitable for large-scale popularization and application of enterprises.
The mains supply voltage detection circuit is applied to a switch power supply system, so that the whole switch 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 expanded and extended on the basis of the reference, is applied to design schemes of other zero-crossing detection circuits in the same field, and has wide application prospect.
The following detailed description of the embodiments of the present invention is provided in connection with the accompanying drawings for the purpose of facilitating understanding and understanding of the technical solutions of the present invention.
Drawings
Fig. 1 is a schematic diagram of a switching power supply system to which the mains voltage detection circuit of the present invention is applied;
FIG. 2 is a schematic diagram of a commercial power voltage conversion circuit according to the present invention;
FIG. 3 is a timing diagram of an embodiment of a commercial power voltage detection circuit according to the present invention;
FIG. 4 is a timing diagram of another embodiment of the commercial power voltage detection circuit of the present invention;
wherein: 1. a rectifying device; 201. a diode; 202. a mains voltage conversion circuit; 2021. a mains voltage sampling circuit; 2022. an analog-to-digital conversion circuit; 203. a carrier generation circuit; 204. a modulation circuit; 3. an input capacitance Cf; 4. an energy transmission device T1; 401. a primary winding; 402. a secondary winding; 5. a rectifier diode D1; 6. an output capacitor Co; 7. a power supply control chip; 8. a load; 9. an output power adjustment module; 10. a demodulation chip; 11. and (6) isolating the devices.
Detailed Description
The invention discloses a mains supply voltage detection circuit which can be integrated in a control chip and has high reliability, high resource utilization rate and low system manufacturing cost and a switching power supply system using the same.
As shown in fig. 1, a mains voltage detection circuit is applied to a switching power supply system with a flyback topology, and is further limited, where the switching power supply system is an isolated switching power supply system. The mains voltage detection circuit is composed of a mains voltage conversion circuit 202, a carrier generation circuit 203 and a modulation circuit 204.
The utility voltage conversion circuit 202 and the carrier generation circuit 203 are arranged in parallel, the input ends of the utility voltage conversion circuit 202 and the carrier generation circuit 203 are electrically connected and jointly used as the input end of the whole utility voltage detection circuit, the output ends of the utility voltage conversion circuit 202 and the carrier generation circuit 203 are electrically connected with the input end of the modulation circuit 204, and the output end of the modulation circuit 204 is used as the output end of the whole utility voltage detection circuit.
The input end of the mains voltage detection circuit is electrically connected with an external AC input by means of a diode 201, the anode of the diode 201 is electrically connected with the AC input, and the cathode of the diode 201 is electrically connected with the input ends of the mains voltage conversion circuit 202 and the carrier generation circuit 203 respectively.
Here, the diode 201 may be provided in an externally independent manner, or may be integrally provided in the mains voltage detection circuit, as long as it is provided as required on the premise that the above connection relationship is satisfied.
The output end of the commercial power voltage conversion circuit 202 is electrically connected with the input end of the modulation circuit 204, and outputs a sampling signal to the modulation circuit 204; the output end of the carrier generation circuit 203 is electrically connected to the input end of the modulation circuit 204, and outputs a carrier signal to the modulation circuit 204.
The modulation circuit 204 modulates the carrier signal output by the carrier generation circuit as a carrier signal and the sampling signal output by the mains voltage conversion circuit as a modulation signal, and finally generates an output signal containing information of the carrier signal. The output end of the modulation circuit 204 is electrically connected with an external functional device and outputs a signal to the functional device; the functional device is here an isolation device 11.
It should be further noted that the modulation circuit 204 modulates a pulse width of the carrier signal or modulates a driving current of the carrier signal; the output signal of the modulation circuit 204 is a modulated carrier signal.
It should be emphasized that the carrier generation circuit 203 at least includes any one of a commercial power zero-crossing detection circuit or a commercial power chopper circuit, and may also be various frequency circuits or functional devices having a sampling function, such as a frequency clock inside the circuit.
Specifically, as shown in fig. 2, the mains voltage conversion circuit 202 is composed of a mains voltage sampling circuit 2021 and an analog-to-digital conversion circuit 2022, which are connected in sequence.
The sampling mode of the mains voltage sampling circuit 2021 may be voltage sampling, current sampling, or other various types of sampling. The analog-to-digital conversion circuit 2022 may be implemented by using any one of a decoder, a current comparator, and a voltage comparator, which are commonly used in the art, to implement a circuit design, and in subsequent applications, an electrical component or a circuit structure having the same function as the above-mentioned device may also be used as the analog-to-digital conversion circuit 2022.
The analog-to-digital conversion circuit 2022 can convert the received analog signal into a digital output signal and output the digital output signal.
When the carrier generation circuit 203 is a mains zero-crossing detection circuit, a timing diagram of the mains voltage detection circuit is shown in fig. 3.
The commercial power zero-crossing detection circuit detects the voltage of Vac, when Vac is less than or equal to 0V, the zero-crossing signal is high, and when Vac is greater than 0V, the zero-crossing signal is low. The zero-crossing signal is used as a carrier signal to be modulated with a sampling signal generated by a mains voltage conversion circuit, the pulse width of the zero-crossing signal is modulated, a modulation signal with the modulated pulse width is generated, and the modulation signal is transmitted to a post-stage demodulation chip through an isolation device.
When the carrier generation circuit 203 is a mains chopper circuit, a timing diagram of the mains voltage detection circuit is shown in fig. 4.
The mains supply chopper circuit detects the voltage of Vac and sets a chopper voltage VChopper, when the Vac is less than or equal to VChopper, a chopper signal is low, and when the Vac is greater than VChopper, the chopper signal is high. The chopping signal is used as a carrier signal to be modulated with a sampling signal generated by a mains supply voltage conversion circuit, the pulse width of the chopping signal is modulated, a modulation signal with the modulated pulse width is generated, and the modulation signal is transmitted to a post-stage demodulation chip through an isolation device.
A switching power supply system, as shown in fig. 1, includes the above-mentioned mains voltage detection circuit, corresponding to the preamble description, and the switching power supply system is a flyback topology structure. It is to be noted, however, that the flyback topology is only one of the switching power supply topologies to which the mains voltage detection circuit is applicable. In addition, the switching power supply system shown in fig. 1 is an isolated switching power supply system.
The switching power supply system can process an ac input voltage and provide output power to the load 8. For example, the input voltage may be an ac input voltage Vac.
The switching power supply system further includes: the circuit comprises a rectifying device 1, an input capacitor Cf3, an energy transmission device T14, a rectifying diode D15, an output capacitor Co6, a load 8, an output power adjusting module 9, a demodulation chip 10 and an isolating device 11.
The rectifying device 1 may be a rectifying bridge or a single bridge rectifying circuit. One output end of the rectifying device 1 is electrically connected with the input end of the mains voltage detection circuit by means of a diode 201, and the other output end of the rectifying device 1 is electrically connected with the energy transmission device T14.
The energy transmission device T14 is a double-winding structure including a primary winding 401 and a secondary winding 402, the primary winding 401 is electrically connected to one end of the input capacitor Cf3, the other end of the input capacitor Cf3 is grounded, and the secondary winding 402 is electrically connected to the anode of the rectifier diode D15. In other embodiments, the energy transfer device T14 may be a structure including more windings or a transformer.
The output end of the commercial power voltage detection circuit is electrically connected with the input end of the isolation device 11, the output end of the isolation device 11 is electrically connected with the input end of the demodulation chip 10, the output end of the demodulation chip 10 is electrically connected with the input end of the output power adjusting module 9, and the output end of the output power adjusting module 9 is respectively electrically connected with the cathode of the rectifier diode D15, the output capacitor Co6 and the load 8.
In the switching power supply system, the switching power supply system further comprises a power supply control chip 7, and the commercial power voltage detection circuit can be independently arranged or can be integrally arranged in the power supply control chip 7. The power control chip 7 is electrically connected to the primary winding 401 and configured to receive an output feedback signal Uo in a system, where the output feedback signal Uo is a voltage signal or a current signal.
It should be emphasized that the output terminal of the demodulation chip 10 is not connected to the input terminal of the mains voltage detection circuit, and does not feed back a signal to the mains voltage detection circuit. The arrangement mode can reduce the resource occupation in the demodulation chip 10 as much as possible, and improve the processing efficiency of the demodulation chip 10.
In this embodiment, the isolation device 11 may be an optical coupler or an isolation capacitor or a transformer, and transmits an output signal generated by the mains voltage detection circuit to the demodulation chip 10; the demodulation chip 10 may be a single-chip microcomputer or a customized demodulation chip.
The invention provides a commercial power voltage detection circuit, which is composed of a commercial power voltage conversion circuit, a carrier generation circuit and a modulation circuit, and has the advantages of simple and visual circuit structure, and the parts and components of the circuit are common and easily-obtained existing products and can be directly integrated in a control chip, so that the setting cost of the whole circuit is greatly reduced.
Meanwhile, due to the existence of the modulation circuit, the zero-crossing signal is used as the carrier wave to transmit the commercial power voltage digital signal while the commercial power zero-crossing signal is transmitted, so that the scheme cost is reduced, excessive occupation of internal resources of a demodulation chip in a system is avoided, the utilization rate of the resources is optimized to the maximum extent, and the modulation circuit is very suitable for large-scale popularization and application of enterprises.
The mains supply voltage detection circuit is applied to a switch power supply system, so that the whole switch 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 expanded and extended on the basis of the reference, is applied to design schemes of other zero-crossing detection circuits in the same field, and has 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 attributes 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, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. An isolated switch power supply system with a flyback topology structure is characterized in that: the power supply voltage detection circuit comprises a mains supply voltage detection circuit, a rectifying device (1), an input capacitor Cf (3), an energy transmission device T1 (4), a rectifying diode D1 (5), an output capacitor Co (6), a load (8), an output power adjusting module (9), a demodulation chip (10) and an isolation device (11);
the mains supply voltage detection circuit is composed of a mains supply voltage conversion circuit (202), a carrier generation circuit (203) and a modulation circuit (204); the utility power voltage conversion circuit (202) and the carrier generation circuit (203) are arranged in parallel, the input ends of the utility power voltage conversion circuit (202) and the carrier generation circuit (203) are electrically connected and jointly used as the input end of the whole utility power voltage detection circuit, the output ends of the utility power voltage conversion circuit (202) and the carrier generation circuit (203) are electrically connected with the input end of the modulation circuit (204), and the output end of the modulation circuit (204) is used as the output end of the whole utility power voltage detection circuit;
the input end of the whole mains voltage detection circuit is electrically connected with an external AC input through a diode (201), the anode of the diode (201) is electrically connected with the AC input, and the cathode of the diode (201) is respectively electrically connected with the input ends of the mains voltage conversion circuit (202) and the carrier generation circuit (203);
one output end of the rectifying device (1) is electrically connected with the input end of the mains voltage detection circuit by virtue of a diode (201), and the other output end of the rectifying device (1) is electrically connected with the energy transmission device T1 (4);
the energy transmission device T1 (4) is of a double-winding structure comprising a primary winding (401) and a secondary winding (402), the primary winding (401) is electrically connected with one end of the input capacitor Cf (3), the other end of the input capacitor Cf (3) is grounded, and the secondary winding (402) is electrically connected with the anode of the rectifier diode D1 (5);
the utility voltage detection circuit's output with the input electric connection of isolating device (11), the output of isolating device (11) with the input electric connection of demodulation chip (10), the output of demodulation chip (10) with the input electric connection of output power adjustment module (9), the output of output power adjustment module (9) respectively with the negative pole of rectifier diode D1 (5), output capacitor Co (6) and load (8) electric connection.
2. The isolated switching power supply system with flyback topology according to claim 1, characterized in that: the carrier generation circuit (203) at least comprises any one of a mains supply zero-crossing detection circuit or a mains supply chopper circuit.
3. The isolated switching power supply system with flyback topology according to claim 1, characterized in that: the output end of the commercial power voltage conversion circuit (202) is electrically connected with the input end of the modulation circuit (204), and a sampling signal is output to the modulation circuit (204); the output end of the carrier generation circuit (203) is electrically connected with the input end of the modulation circuit (204) and outputs a carrier signal to the modulation circuit (204).
4. The isolated switching power supply system with flyback topology according to claim 3, characterized in that: the modulation circuit (204) is used for modulating the pulse width of the carrier signal or modulating the driving current of the carrier signal;
the output signal of the modulation circuit (204) is a modulated carrier signal.
5. The isolated switching power supply system with flyback topology according to claim 1, characterized in that: the mains supply voltage conversion circuit (202) consists of a mains supply voltage sampling circuit (2021) and an analog-digital conversion circuit (2022) which are connected in sequence;
the sampling mode of the mains supply voltage sampling circuit (2021) is voltage sampling or current sampling;
the analog-to-digital conversion circuit (2022) is a decoder or a current comparator or a voltage comparator.
6. The isolated switching power supply system with flyback topology according to claim 1, characterized in that: the power supply control circuit comprises a primary winding (401), a power supply control chip (7), a secondary winding and a power supply, wherein the power supply control chip (7) is electrically connected with the primary winding (401) and is used for receiving an output feedback signal UO in a system, and the output feedback signal UO is a voltage signal or a current signal;
the mains supply voltage detection circuit is independently arranged or integrally arranged inside the power control chip (7).
7. The isolated switching power supply system with flyback topology according to claim 1, characterized in that: the output end of the demodulation chip (10) is not communicated with the input end of the mains supply voltage detection circuit, and signals are not fed back to the mains supply voltage detection circuit.
8. The isolated switching power supply system with flyback topology according to claim 1, characterized in that: the rectifier device (1) is a rectifier bridge or a single-bridge rectifier circuit; the isolation device (11) is an optical coupler, an isolation capacitor or a mutual inductor; the demodulation chip (10) is a single-chip microcomputer.
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| CN202011075684.3A CN112345821B (en) | 2020-10-10 | 2020-10-10 | Commercial power voltage detection circuit and switch power supply system using same |
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| CN202011075684.3A CN112345821B (en) | 2020-10-10 | 2020-10-10 | Commercial power voltage detection circuit and switch power supply system using same |
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| CN112345821A (en) | 2021-02-09 |
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