CN116505784A - Power supply chip for non-isolated power supply system and control circuit thereof - Google Patents
Power supply chip for non-isolated power supply system and control circuit thereof Download PDFInfo
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- CN116505784A CN116505784A CN202210071017.0A CN202210071017A CN116505784A CN 116505784 A CN116505784 A CN 116505784A CN 202210071017 A CN202210071017 A CN 202210071017A CN 116505784 A CN116505784 A CN 116505784A
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- 238000001514 detection method Methods 0.000 claims abstract description 133
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- 230000008878 coupling Effects 0.000 claims description 3
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
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Classifications
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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
- H02M7/219—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 in a bridge configuration
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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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- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Rectifiers (AREA)
- Dc-Dc Converters (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention provides a non-isolated AC-DC power supply system, a power supply chip thereof and a control circuit thereof. The power supply chip comprises a switching device, a linear device, a detection processing circuit and a switch driving circuit. Wherein the switching device is coupled between the rectifying circuit and the linear device, the second terminal of the linear device provides an output voltage, and the detection processing circuit receives the rectified power signal and provides a zero crossing signal and an ac detection signal at the same time. The switch driving circuit is used for controlling the control end of the switching device. The invention integrates the zero-crossing detection function and the AC detection function in the non-isolated AC-DC system, provides convenience for the function expansion of the back-stage circuit of the household appliance, has simple peripheral circuit, reduces the volume and the cost of the system and improves the reliability of the system.
Description
Technical Field
The invention relates to the field of electronics, in particular, but not exclusively, to a power supply chip for a non-isolated power supply system and a control circuit thereof.
Background
In a power supply system powered by an alternating current power supply signal, when the waveform of the alternating current power supply signal is converted in positive and negative half cycles and passes through zero, the system can detect and output a zero crossing signal to a rear-stage system. The reference zero crossing signal of the back-stage system is used for controlling devices such as a silicon controlled rectifier, a relay and the like to be turned on at the zero point of an alternating current power supply signal, and is used for improving the reliability of the devices and EMC (electromagnetic compatibility) performance.
In the field of household appliances, AC-DC (alternating current to direct current) power supply systems generally employ isolated power supplies and non-isolated power supplies. The existing isolated power supply generally adopts a flyback voltage conversion circuit, so that the application range is wide, and the technology is mature. In order to control devices such as a silicon controlled rectifier and a relay in a household appliance system, the isolated power supply can provide a zero-crossing detection function for detecting a zero-crossing point of an alternating-current power supply signal. Fig. 1 shows a ZERO-crossing detection scheme for an isolated power supply, wherein a ZERO-crossing detection circuit provides a ZERO-crossing signal at a ZERO-crossing detection output terminal ZERO through the cooperation of resistors R1-R3, a rectifying diode D1, a triode Q1, an optocoupler EL, a voltage source and the like which are connected in series, the ZERO-crossing signal ZERO outputs a low-level signal when an ac input voltage (voltage between an ACL terminal and an ACN terminal) is a positive half-wave, and outputs a high-level signal when the ac input voltage is a negative half-wave. The ZERO crossing signal ZERO appears as a 50Hz square wave signal, the rising and falling edges of which characterize the ZERO crossings of the ac power supply signal.
In addition, in the home appliance system, there is a need to detect the amplitude of an ac power supply signal, and the subsequent system can control the load according to the ac detection signal. The common alternating current detection scheme adopts an electrolytic capacitor to filter an alternating current power supply signal, and the control circuit obtains the amplitude of the alternating current power supply signal by collecting and detecting the voltage signal after the filtering and combining the proportional relation, but the electrolytic capacitor in the detection scheme has higher cost.
In the field of household appliances, in order to meet the collinear requirement of a silicon controlled rectifier and simplify the design, the existing AC-DC non-isolated power supply system basically adopts a floating architecture, so that the control circuit controls the control voltage of a power switch of a voltage conversion circuit based on a reference terminal such as the terminal voltage of the power switch, and the voltage of the reference terminal relative to power ground is changed. The zero-crossing point of the alternating current power supply signal is referenced to the power ground, so that zero-crossing detection of an alternating current input signal cannot be integrated in a chip of an AC-DC non-isolated power supply system in the existing household appliance field, and an alternating current detection function cannot be realized. These two functions can only be accomplished by peripheral discrete devices, which adds to the cost and bulk of the system manufacturing.
In view of this, there is a need to provide a new architecture or control method in order to solve at least some of the above problems.
Disclosure of Invention
At least in view of one or more problems in the background art, the present invention provides a non-isolated power supply system, a power supply chip thereof and a control circuit thereof, which can be used in a home appliance system.
According to one aspect of the present invention, a power supply chip for a non-isolated AC-DC power supply system includes: a first end of the switching device is coupled with a first output end of the rectifying circuit and used for receiving a rectified power signal, and a second end of the switching device is coupled with the first capacitor and used for providing an intermediate power supply voltage; a linear device having a first terminal and a second terminal, wherein the first terminal of the linear device is coupled to the second terminal of the switching device, and the second terminal of the linear device is coupled to the output capacitor for providing an output voltage; the input end of the detection processing circuit receives the rectified power supply signal, the first output end of the detection processing circuit provides a zero-crossing signal, the second output end of the detection processing circuit provides an alternating-current detection signal, and the reference ground of the detection processing circuit is coupled with the second output end of the rectification circuit and the system power ground; and a switch driving circuit having an input end and an output end, wherein the input end of the switch driving circuit is coupled to the third output end of the detection processing circuit, and the output end of the switch driving circuit is coupled to the control end of the switching device.
In one embodiment, the switching device is turned on at the valley of the rectified mains signal.
In one embodiment, the detection processing circuit includes: the resistor voltage dividing circuit is provided with an input end and an output end, wherein the input end of the resistor voltage dividing circuit receives a rectified power signal; the zero-crossing detection circuit is provided with an input end and an output end, wherein the input end of the zero-crossing detection circuit is coupled with the output end of the resistor divider circuit, and the output end of the zero-crossing detection circuit provides a zero-crossing signal; the alternating current signal detection circuit is provided with a first input end, a second input end and an output end, wherein the first input end is coupled with the output end of the resistor divider circuit, the second input end is coupled with the output end of the zero crossing detection circuit, and the output end of the alternating current signal detection circuit provides an alternating current detection signal.
In one embodiment, the zero-crossing detection circuit comprises a triode, wherein the base electrode of the triode is coupled with the output end of the resistor voltage dividing circuit, the emitter electrode of the triode is grounded, and the collector electrode of the triode is coupled with a voltage source through a resistor and serves as the output end of the zero-crossing detection circuit.
In one embodiment, an ac signal detection circuit includes: the time signal sampling circuit is provided with an input end and an output end, wherein the input end of the time signal sampling circuit is coupled with the output end of the zero crossing detection circuit, and the output end of the time signal sampling circuit provides a pulse signal representing time information based on the zero crossing signal; the voltage sampling circuit is provided with a first input end, a second input end and an output end, wherein the first input end of the voltage sampling circuit is coupled with the output end of the resistor divider circuit, the second input end of the voltage sampling circuit is coupled with the output end of the time signal sampling circuit, and the output end of the voltage sampling circuit provides a voltage sampling signal; the information processing circuit is provided with an input end and an output end, the input end of the information processing circuit is coupled with the input end of the voltage sampling circuit, and the output end of the information processing circuit is used as the output end of the alternating current signal detection circuit.
In one embodiment, the power chip includes at least five pins, wherein: the first pin is externally coupled with a first output end of the rectifying circuit; the second pin is externally coupled with the power ground of the power supply system; a second terminal of the third pin pair internal coupling linear device for providing an output voltage; the fourth pin pair is internally coupled with the first output end of the detection processing circuit and is used for providing a zero crossing signal; the fifth pin pair is coupled to the second output end of the detection processing circuit and is used for providing an alternating current detection signal.
In one embodiment, the power supply chip further includes a sixth pin coupled to the first end of the linear device and coupled to the first capacitor for providing an intermediate supply voltage.
According to another aspect of the present invention, a power supply chip for a non-isolated power supply system includes: the input pin is externally coupled with a first output end of the rectifying circuit, wherein the input end of the rectifying circuit is coupled with an alternating current power supply signal; the grounding pin is connected with the second output end of the external rectifying circuit; the output pin is externally coupled with the output capacitor and is used for providing output voltage; the zero-crossing signal output pin is used for providing a zero-crossing signal which characterizes the zero-crossing state of the alternating-current power supply signal; and an ac sense output pin for providing an ac sense signal, the ac sense signal being indicative of an amplitude of the ac power signal.
In one embodiment, a power chip includes: a switching device having a first end, a second end, and a control end, wherein the first end of the switching device is coupled to an input pin of the power supply chip; a linear device having a first end and a second end, wherein the first end of the linear device is coupled to the second end of the switching device, and the second end of the linear device is coupled to an output pin of the power supply chip for providing an output voltage; the detection processing circuit is provided with an input end, a first output end and a second output end, wherein the input end of the detection processing circuit is coupled with the first end of the switching device, the first output end of the detection processing circuit is coupled with a zero crossing signal output pin of the power supply chip, and the second output end of the detection processing circuit is coupled with an alternating current detection output pin of the power supply chip; and a switch drive circuit having an input and an output, wherein the input of the switch drive circuit receives a signal indicative of a voltage at the first terminal of the switching device, and the output of the switch drive circuit is coupled to the control terminal of the switching device.
In one embodiment, the power supply chip further has an intermediate voltage pin, and the pair of intermediate voltage pins is internally coupled to the second end of the switching device and externally coupled to the first capacitor.
According to still another aspect of the present invention, a non-isolated power supply system for an electric home appliance includes: the input end of the rectifying circuit receives an alternating current power supply signal, and the output end of the rectifying circuit provides a rectifying power supply signal; the power chip as in any above embodiment; a first capacitor for providing an intermediate supply voltage; and an output capacitor for providing an output voltage.
According to still another aspect of the present invention, an on-chip control circuit includes: the detection processing circuit receives the rectified power supply signal and provides a zero-crossing signal and an alternating-current detection signal, wherein the rectified power supply signal is a rectified signal of the alternating-current power supply signal, and the reference ground of the detection processing circuit and the reference ground of the rectified power supply signal are grounded together; and a switch driving circuit coupled to the detection processing circuit and controlling a control terminal of the switching device, wherein a first terminal of the switching device receives the rectified power signal, a second terminal of the switching device is coupled to the first terminal of the linear device, and a second terminal of the linear device provides the output voltage.
The power supply chip, the non-isolated power supply system and the control circuit thereof can integrate zero-crossing detection and AC detection functions in the non-isolated AC-DC system at the same time, and provide convenience for the function expansion of the post-circuit of the household appliance. And the bridge high-voltage electrolytic capacitor is not needed, the peripheral circuit is simple, the volume and cost of the system are greatly reduced, and the reliability of the system is improved.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and together with the description serve to explain the embodiments of the invention, and do not constitute a limitation of the invention. In the drawings:
FIG. 1 illustrates a zero crossing detection scheme for an isolated power supply;
FIG. 2 illustrates a schematic diagram of a non-isolated AC-DC power supply system in accordance with an embodiment of the invention;
FIG. 3 shows a schematic circuit diagram of a non-isolated AC-DC power supply system according to an embodiment of the invention;
fig. 4 shows a schematic diagram of a conduction control waveform of a switching device according to an embodiment of the present invention;
FIG. 5 shows a schematic diagram of a zero crossing detection circuit according to an embodiment of the invention;
fig. 6 shows a block diagram schematic of an ac signal detection circuit according to an embodiment of the invention.
Detailed Description
For a further understanding of the present invention, preferred embodiments of the invention are described below in conjunction with the examples, but it should be understood that these descriptions are merely intended to illustrate further features and advantages of the invention, and are not limiting of the claims of the invention.
The description of this section is intended to be illustrative of only a few exemplary embodiments and the invention is not to be limited in scope by the description of the embodiments. Combinations of the different embodiments, and alternatives of features from the same or similar prior art means and embodiments are also within the scope of the description and protection of the invention.
"coupled" or "connected" in the specification includes both direct and indirect connections. An indirect connection is a connection via an intermediary, such as a connection via an electrically conductive medium, such as a conductor, where the electrically conductive medium may contain parasitic inductance or parasitic capacitance, or may be a connection via an intermediary circuit or component described in the embodiments of the specification; indirect connections may also include connections through other active or passive devices, such as through circuits or components such as switches, signal amplification circuits, follower circuits, and the like, that may perform the same or similar functions. "plurality" or "multiple" means two or more.
Fig. 2 shows a schematic diagram of a non-isolated AC-DC power supply system according to an embodiment of the invention. Preferably, the non-isolated power supply system is used for supplying power to a household appliance Load based on mains alternating current Vac. The non-isolated power supply system does not use a transformer to isolate the power supply input end from the power supply output end. The non-isolated power supply system comprises a rectifying circuit 21, a power supply chip 20, a first capacitor C1 and an output capacitor Co. The input terminal of the rectifying circuit 21 receives the ac power signal Vac, wherein the first input terminal of the rectifying circuit 21 is coupled to a first terminal, such as an ACN terminal, of the ac power signal Vac, and the second input terminal of the rectifying circuit 21 is coupled to a second terminal, such as an ACL terminal, of the ac power signal Vac. An output of the rectifying circuit 21 provides a rectified and rectified power signal Vbus. Wherein a first output terminal of the rectifying circuit 21 is coupled to the power supply chip 20, and a second output terminal of the rectifying circuit 21 is coupled to the power ground GND. The power supply chip has six pins, wherein the first pin is an input pin IN, coupled to the output end of the rectifying circuit 21, and configured to externally receive the rectified power signal Vbus output by the rectifying circuit 21. The second pin is a ground pin GND for grounding to the power ground GND of the rectifier circuit 21, i.e. to the rectified power supply signal Vbus, without a floating frame. The third pin is the output pin VO for providing an output voltage for powering the Load. Wherein the output pin VO may couple the output capacitance Co and the Load to ground GND. In one embodiment, the output capacitance Co may be part of the Load. The fourth pin is a ZERO-crossing signal output pin ZERO for providing a ZERO-crossing signal, which characterizes the ZERO-crossing state of the ac power signal Vac, and can be used for providing signals for other devices such as a subsequent thyristor or relay. The fifth pin is an AC detection output pin AC for providing an AC detection signal, which is a voltage signal for characterizing the amplitude of the AC power supply signal Vac. The alternating current detection signal AC may also be used to provide a signal to a relay or other control circuit in the home appliance system. The sixth pin is an intermediate voltage pin VDD, which is used for externally coupling to the first capacitor C1 and providing an intermediate supply voltage for the power supply chip 20. Preferably, the input voltage may be provided to a linear device in the power supply chip 20. In another embodiment, the first capacitor C1 is built in the power supply chip 20, the other end of the first capacitor C1 is coupled to the ground pin GND, and the power supply chip 20 may not have the sixth pin VDD. It should be noted that the pin order in the different embodiments may not correspond to the pin order shown in fig. 2, and the pin order is only used for illustration, and is not used to indicate the positions and the specific arrangement order of any pin arrangement, and any arrangement manner of the pin positions should be covered. Preferably, the power supply chip 20 is a chip packaged by a packaging process. In another embodiment, the circuitry in the power chip 20 may also be fabricated on the same semiconductor substrate as an unpackaged semiconductor die.
Fig. 3 shows a schematic circuit diagram of a non-isolated AC-DC power supply system according to an embodiment of the invention. The non-isolated power supply system comprises a rectifying circuit, a power supply chip 300, a first capacitor C1 and an output capacitor Co. The power supply chip 300 has six pins, wherein a first pin IN is coupled to an output end of the rectifying circuit, an intermediate voltage pin VDD is coupled to the first capacitor C1, a ground pin GND is coupled to power ground of the rectifying circuit, an output pin VO is used for providing a power supply Vout for electronic components IN the household appliance, and a ZERO-crossing signal output pin ZERO and an AC detection output pin AC are respectively used for providing a ZERO-crossing signal and an AC detection signal for other circuits.
The power supply chip 300 includes a switching device Q1, a linear device 31, a detection processing circuit 32, and a switch driving circuit 33. The switching device Q1 has a first end, a second end and a control end, the first end of the switching device Q1 is coupled to the input pin IN, that is, the output end of the rectifying circuit is used for receiving the rectified power signal Vbus, and the second end of the switching device Q1 is coupled to the intermediate voltage pin VDD, and is used for being coupled to the first capacitor C1 to provide an intermediate supply voltage. The linear device 31 has a first terminal and a second terminal, wherein the first terminal of the linear device 31 is coupled to the second terminal of the switching device Q1, and the second terminal of the linear device 31 is coupled to the output pin VO for providing the output voltage Vout. The linear circuit 31 and the chip control circuit 30 perform voltage signal processing based on the power ground GND, wherein the chip control circuit 30 includes a detection processing circuit 32 and a switch driving circuit 33. The detection processing circuit 32 has an input terminal, a first output terminal, a second output terminal and a third output terminal, wherein the input terminal of the detection processing circuit 32 is coupled to the input pin IN, the first output terminal of the detection processing circuit 32 is coupled to the ZERO-crossing signal output pin ZERO, the second output terminal of the detection processing circuit 32 is coupled to the AC detection output pin AC for providing an AC detection signal, and the third output terminal of the detection processing circuit 32 provides a detection signal of the rectified power signal Vbus. The switch driving circuit 33 has an input terminal and an output terminal, wherein the input terminal of the switch driving circuit 33 is coupled to the third output terminal of the detection processing circuit 32, that is, the output terminal of the resistor divider circuit, and the output voltage thereof represents the rectified power signal Vbus of the first terminal of the switching device Q1, and the output terminal of the switch driving circuit 33 is coupled to the control terminal of the switching device Q1 for controlling the on and off of the switching device Q1. In one embodiment, the switch driving circuit 33 turns on the switching device Q1 at the valley position of the rectified power signal Vbus based on the state of the rectified power signal Vbus.
Fig. 4 shows a schematic diagram of a conduction control waveform of the switching device Q1 according to an embodiment of the present invention. The rectified power signal Vbus is a half-wave waveform of the illustrated alternating current wave after rectification. Wherein the switching device Q1 is turned on at the valley position of the rectified power signal Vbus. In one embodiment, switching device Q1 is turned on when the rectified power signal Vbus is detected to be less than a threshold signal, and switching device Q1 is turned off when Vbus is greater than the threshold. The energy of the first end of the switching device Q1 is correspondingly transferred to the first capacitor C1 and the post-stage linear circuit 31, so that the voltage amplitude of the intermediate power supply voltage VDD is reduced relative to the amplitude of the rectified power supply signal Vbus, and the input end voltage of the linear circuit 31 is ensured to be between the lowest working voltage and the highest withstand voltage of the linear circuit 31.
Continuing with the description of fig. 3, the output terminal of the linear circuit 31 of the subsequent stage is connected to the output capacitor Co, and the linear circuit 31 is processed based on the intermediate power supply voltage VDD to obtain a stable dc output voltage Vout. In another embodiment, the linear circuit 31 may be replaced by other DC-DC voltage stabilizing circuits.
In one embodiment, the magnitude of the output voltage Vout is 3-50 volts and the average voltage magnitude of the rectified power signal Vbus is about 220 volts. Through the topology, the conversion from the commercial power alternating current Vac to the low-voltage regulated power supply can be realized without a transformer. And the control circuit controls the switching device Q1 based on the amplitude of the rectified power signal Vbus. The reference ground of the control circuit 30 adopts the power ground GND instead of the floating frame.
The detection processing circuit 32 includes a resistance voltage dividing circuit, a zero-crossing detection circuit 321, and an alternating-current signal detection circuit 322. The resistor voltage dividing circuit comprises two resistors connected IN series, the input end of the resistor voltage dividing circuit is coupled with the first pin IN and used for receiving the rectified power supply signal Vbus, the resistor voltage dividing circuit is used for providing a detection signal Vd proportional to the rectified power supply signal Vbus, and the ratio of the Vbus to the Vd is set by the resistance value of the resistor voltage dividing circuit. The ZERO-crossing detection circuit 321 has an input terminal and an output terminal, wherein the input terminal of the ZERO-crossing detection circuit 321 is coupled to the output terminal of the resistor divider circuit, and the output terminal of the ZERO-crossing detection circuit 321 is coupled to the fourth pin ZERO for providing the ZERO-crossing signal and is simultaneously coupled to the ac signal detection circuit 322.
Fig. 5 shows a schematic diagram of a zero crossing detection circuit according to an embodiment of the invention. The zero-crossing detection circuit adopts a very simple structure and comprises a triode and a resistor R. The base b of the triode is coupled to the output end of the resistor divider circuit, receives the detection signal Vd proportional to the rectified power signal Vbus, the emitter e of the triode is coupled to the power ground GND, or is coupled to the power ground GND through a resistor, the collector c of the triode is coupled to the first end of the resistor R, and the second end of the resistor R is coupled to a voltage source V1. The voltage source V1 may be an intermediate supply voltage VDD, or may be an output voltage or other voltage source. The collector c of the transistor provides a ZERO crossing signal ZERO. I.e. the collector c of the transistor is coupled to the voltage source V1 via a resistor R and serves as the output of the zero crossing detection circuit. When the detection signal Vd is smaller than the on threshold voltage of the triode, the triode is cut off, and the ZERO crossing signal ZERO is equal to the voltage source V1 and is in a high level; when the detection signal Vd is greater than the on threshold voltage of the triode, the triode is conducted, the collector c of the triode is grounded GND, and the ZERO crossing signal ZERO is low level. Thus, when the rectified power signal Vbus is located at the valley, the ZERO crossing signal ZERO exhibits a high level pulse for indicating the ZERO crossing position of the ac power signal Vac.
Continuing with the description of fig. 3, the AC signal detecting circuit 322 has a first input terminal coupled to the output terminal of the resistor divider circuit, a second input terminal coupled to the output terminal of the zero crossing detecting circuit 321, and an output terminal coupled to the fifth pin AC of the AC signal detecting circuit 322 for providing an AC detection signal indicating the magnitude of the AC power signal Vac. Preferably, the alternating current detection signal AC is used to indicate the voltage average of the rectified power signal Vbus. The AC detection signal AC may also indicate the voltage amplitude, the real-time variation value, or the periodic sampling value of the AC power supply signal Vac or the rectified power supply signal Vbus.
Fig. 6 shows a schematic diagram of an ac signal detection circuit according to an embodiment of the present invention. The ac signal detection circuit includes a time signal sampling circuit 61, a voltage sampling circuit 62, and an information processing circuit 63. Wherein an input of the time signal sampling circuit 61 is coupled to an output of the ZERO crossing detection circuit for receiving the ZERO crossing signal ZERO, the time signal sampling circuit 61 generates a pulse signal TP characterizing the time information based on the ZERO crossing signal ZERO, and the pulse signal TP is provided at the output of the time signal sampling circuit 61. In one embodiment, the time signal sampling circuit 61 includes a delay circuit that delays the pulse of the ZERO crossing signal ZERO by a certain time to generate a new pulse signal TP. The delay circuit can delay one-fourth of the power frequency period to generate one pulse after receiving the high-level pulse of the ZERO-crossing signal ZERO. The delay circuit can also generate a plurality of pulses according to time in a half power frequency period after receiving the high-level pulse of the ZERO-crossing signal ZERO. The voltage sampling circuit 62 has a first input terminal, a second input terminal and an output terminal, wherein the first input terminal of the voltage sampling circuit 62 is coupled to the output terminal of the resistor divider circuit for receiving the detection signal Vd representing the rectified power signal Vbus, the second input terminal of the voltage sampling circuit 62 is coupled to the output terminal of the time signal sampling circuit 61 for receiving the pulse signal TP, and the output terminal of the voltage sampling circuit 62 provides the voltage sampling signal Vp. In one embodiment, the voltage sample signal Vp is used to reflect the value of the detection signal Vd when the pulse signal Tp outputs a pulse. The information processing circuit 63 has an input end and an output end, the input end of the information processing circuit 63 is coupled to the input end of the voltage sampling circuit 62, and the output end of the information processing circuit 63 is coupled to the fifth pin of the power supply chip for providing the alternating current detection signal AC. In one embodiment, the information processing circuit 63 provides a corresponding AC detection signal AC based on the voltage sample signal Vp and according to a sampling period/sampling time set point of the time signal sampling circuit 61. Preferably, the alternating current detection signal AC is used to characterize the amplitude or average value of the rectified power signal Vbus. The AC detection signal AC may also be fitted according to the sampled voltage sampling signal Vp to output a voltage value representing the rectified power signal Vbus in real time.
By the scheme of the embodiment, the system works based on the complete envelope waveform of the rectified power supply signal Vbus, can be used for integrating zero-crossing detection and AC detection functions in a non-isolated AC-DC system at the same time, and does not need to adopt a high-voltage capacitor behind a rectification circuit. The defect that the zero-crossing detection function and the AC detection function cannot be integrated at the same time because a non-isolated AC-DC voltage conversion system gradually becomes the main stream in the current household appliance power supply field is overcome. And the method provides convenience for the expansion of functions of components such as motors and the like of the rear-stage circuits in the household appliances. Meanwhile, the system periphery is simplified, and the cost is greatly reduced. After the system integration is carried out, a client does not need to additionally build a zero-crossing circuit and an AC detection circuit by adopting discrete devices, so that the system periphery is simplified to a great extent, and the design difficulty is reduced. And simultaneously, electromagnetic compatibility (EMC) performance is optimized due to simplification of peripheral circuits and improvement of integration level. Because the peripheral zero crossing and the AC detection circuit have higher requirements on the wiring of a Printed Circuit Board (PCB), the poor peripheral circuit wiring is easy to influence the EMC performance of the system. Under the condition of meeting the functions, the material cost and the assembly cost of the system can be reduced. Meanwhile, after the use of discrete devices is reduced, the overall yield of the system can be improved, and the accuracy of zero crossing signals is ensured through a mature semiconductor process and a high-standard encapsulation and measurement program. In the solution of the embodiment, the process requirements on the aspect of high-low voltage isolation and signal processing of the semiconductor are low, the high voltage withstand requirement is only provided for the switching device Q1 (usually a metal oxide semiconductor field effect transistor), the high voltage withstand requirement is not provided for the linear device LDO with high precision requirement, and the high voltage and the low voltage are physically isolated through two parts of circuits, so that the control precision of the LDO signal is improved, and meanwhile, the manufacturing cost is reduced.
The description and applications of the present invention herein are illustrative and are not intended to limit the scope of the invention to the embodiments described above. The relevant descriptions of effects, advantages and the like in the description may not be presented in practical experimental examples due to uncertainty of specific condition parameters or influence of other factors, and the relevant descriptions of effects, advantages and the like are not used for limiting the scope of the invention. Variations and modifications of the embodiments disclosed herein are possible, and alternatives and equivalents of the various components of the embodiments are known to those of ordinary skill in the art. It will be clear to those skilled in the art that the present invention may be embodied in other forms, structures, arrangements, proportions, and with other assemblies, materials, and components, without departing from the spirit or essential characteristics thereof. Other variations and modifications of the embodiments disclosed herein may be made without departing from the scope and spirit of the invention.
Claims (13)
1. A power chip for a non-isolated AC-DC power system, comprising:
the first end of the switching device is coupled with the first output end of the rectifying circuit and used for receiving the rectified power supply signal, and the second end of the switching device is coupled with the first capacitor and used for providing an intermediate power supply voltage;
a first end of the linear device is coupled with a second end of the switching device, and a second end of the linear device is coupled with the output capacitor for providing output voltage;
the input end of the detection processing circuit receives the rectified power supply signal, the first output end of the detection processing circuit provides a zero-crossing signal, the second output end of the detection processing circuit provides an alternating-current detection signal, and the reference ground of the detection processing circuit is coupled with the second output end of the rectification circuit and the system power ground; and
the switch driving circuit is provided with an input end and an output end, wherein the input end of the switch driving circuit is coupled with the third output end of the detection processing circuit, and the output end of the switch driving circuit is coupled with the control end of the switch device.
2. The power chip of claim 1, wherein the switching device is turned on at a valley position of the rectified power signal.
3. The power chip of claim 1, wherein the detection processing circuit comprises:
the resistor voltage dividing circuit is provided with an input end and an output end, wherein the input end of the resistor voltage dividing circuit receives a rectified power signal;
the zero-crossing detection circuit is provided with an input end and an output end, wherein the input end of the zero-crossing detection circuit is coupled with the output end of the resistor divider circuit, and the output end of the zero-crossing detection circuit provides a zero-crossing signal; and
the alternating current signal detection circuit is provided with a first input end, a second input end and an output end, wherein the first input end is coupled with the output end of the resistor divider circuit, the second input end is coupled with the output end of the zero crossing detection circuit, and the output end of the alternating current signal detection circuit provides an alternating current detection signal.
4. The power supply chip of claim 3, wherein the zero-crossing detection circuit comprises a triode, a base electrode of the triode is coupled with the output end of the resistor divider circuit, an emitter electrode of the triode is grounded, and a collector electrode of the triode is coupled with a voltage source through a resistor and serves as the output end of the zero-crossing detection circuit.
5. The power supply chip of claim 3, wherein the ac signal detection circuit comprises:
the time signal sampling circuit is provided with an input end and an output end, wherein the input end of the time signal sampling circuit is coupled with the output end of the zero crossing detection circuit, and the output end of the time signal sampling circuit provides a pulse signal representing time information based on the zero crossing signal;
the voltage sampling circuit is provided with a first input end, a second input end and an output end, wherein the first input end of the voltage sampling circuit is coupled with the output end of the resistor divider circuit, the second input end of the voltage sampling circuit is coupled with the output end of the time signal sampling circuit, and the output end of the voltage sampling circuit provides a voltage sampling signal; and
the information processing circuit is provided with an input end and an output end, the input end of the information processing circuit is coupled with the input end of the voltage sampling circuit, and the output end of the information processing circuit is used as the output end of the alternating current signal detection circuit.
6. The power chip of claim 1, comprising at least five pins, wherein:
the first pin is externally coupled with a first output end of the rectifying circuit;
the second pin is externally coupled with a second output end of the rectifying circuit and the power ground of the power supply system;
a second terminal of the third pin pair internal coupling linear device for providing an output voltage;
the fourth pin pair is internally coupled with the first output end of the detection processing circuit and is used for providing a zero crossing signal;
the fifth pin pair is coupled to the second output end of the detection processing circuit and is used for providing an alternating current detection signal.
7. The power chip of claim 6, further comprising a sixth pin coupled to the first end of the linear device and coupled to the first capacitor for providing an intermediate supply voltage.
8. A power chip for a non-isolated power supply system, the power chip having:
the input pin is externally coupled with a first output end of the rectifying circuit, wherein the input end of the rectifying circuit is coupled with an alternating current power supply signal;
the grounding pin is connected with the second output end of the external rectifying circuit;
the output pin is externally coupled with the output capacitor and is used for providing output voltage;
the zero-crossing signal output pin is used for providing a zero-crossing signal which characterizes the zero-crossing state of the alternating-current power supply signal; and
and the alternating current detection output pin is used for providing an alternating current detection signal, and the alternating current detection signal is used for representing the amplitude value of an alternating current power supply signal.
9. The power chip of claim 8, comprising:
a switching device having a first end, a second end, and a control end, wherein the first end of the switching device is coupled to an input pin of the power supply chip;
a linear device having a first end and a second end, wherein the first end of the linear device is coupled to the second end of the switching device, and the second end of the linear device is coupled to an output pin of the power supply chip for providing an output voltage;
the detection processing circuit is provided with an input end, a first output end and a second output end, wherein the input end of the detection processing circuit is coupled with the first end of the switching device, the first output end of the detection processing circuit is coupled with a zero crossing signal output pin of the power supply chip, and the second output end of the detection processing circuit is coupled with an alternating current detection output pin of the power supply chip; and
and a switch driving circuit having an input and an output, wherein the input of the switch driving circuit receives a signal indicative of a voltage at the first terminal of the switching device, and the output of the switch driving circuit is coupled to the control terminal of the switching device.
10. The power chip of claim 9, further having an intermediate voltage pin coupled internally to the second terminal of the switching device and externally to the first capacitor.
11. A non-isolated power supply system for an appliance, comprising:
the input end of the rectifying circuit receives an alternating current power supply signal, and the output end of the rectifying circuit provides a rectifying power supply signal;
the power supply chip of any one of claims 1-10;
a first capacitor for providing an intermediate supply voltage; and
and an output capacitor for providing an output voltage.
12. An on-chip control circuit comprising:
the detection processing circuit receives a rectified power supply signal and provides a zero-crossing signal and an alternating-current detection signal, wherein the rectified power supply signal is a rectified signal of the alternating-current power supply signal, the zero-crossing signal represents a zero-crossing state of the alternating-current power supply signal, the alternating-current detection signal represents an amplitude value of the alternating-current power supply signal, and the reference ground of the detection processing circuit and the reference ground of the rectified power supply signal are grounded together; and
and the switch driving circuit is coupled with the detection processing circuit and controls the control end of the switching device, wherein the first end of the switching device receives the rectified power supply signal, the second end of the switching device is coupled with the first end of the linear device, and the second end of the linear device provides output voltage.
13. The control circuit of claim 12, wherein the switching device is turned on at a valley position of the rectified power signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210071017.0A CN116505784A (en) | 2022-01-21 | 2022-01-21 | Power supply chip for non-isolated power supply system and control circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210071017.0A CN116505784A (en) | 2022-01-21 | 2022-01-21 | Power supply chip for non-isolated power supply system and control circuit thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116505784A true CN116505784A (en) | 2023-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210071017.0A Pending CN116505784A (en) | 2022-01-21 | 2022-01-21 | Power supply chip for non-isolated power supply system and control circuit thereof |
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| Country | Link |
|---|---|
| CN (1) | CN116505784A (en) |
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2022
- 2022-01-21 CN CN202210071017.0A patent/CN116505784A/en active Pending
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