CN217607714U - Power supply chip and non-isolated power supply system for household appliances - Google Patents

Abstract

The utility model provides a power supply chip and be used for the non-isolated electrical power generating system of household electrical appliances. The power supply chip is provided with 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 grounded, the third pin provides output voltage, the fourth pin provides a zero-crossing signal, and the fifth pin provides an alternating current detection signal for representing a voltage signal of an amplitude of an alternating current power supply signal. The utility model discloses the scheme can be simultaneously integrated zero passage detection and AC in non-isolated AC-DC system and detect the function, provides convenience for the extension of household electrical appliances later stage circuit function. And a high-voltage electrolytic capacitor behind a bridge is not needed, a peripheral circuit is simple, the system volume and the cost are greatly reduced, and the system reliability is improved.

Description

Power supply chip and non-isolated power supply system for household appliances

Technical Field

The utility model relates to an electron field, concretely but not limited to relate to a power supply chip and control circuit thereof for non-isolated electrical power generating system.

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 a zero position, the system can detect and output a zero-crossing signal to a post-stage system. The later-stage system references the zero-crossing signal to control devices such as a silicon controlled rectifier and a relay to be switched on at the zero point of the 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 typically employ isolated power supplies and non-isolated power supplies. The existing isolated power supply usually 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 thyristor and a relay in a household appliance system, the isolated power supply can provide a zero-crossing detection function for detecting the zero-crossing point of an alternating-current power supply signal. Fig. 1 shows a ZERO-crossing detection scheme for isolated power supplies, in which a ZERO-crossing detection circuit provides a ZERO-crossing signal at a ZERO-crossing detection output terminal ZERO through the cooperation of serially connected resistors R1 to R3 and a rectifier diode D1, a triode Q1, an opto-coupler EL, a voltage source, etc., the ZERO-crossing signal ZERO outputting a low level signal when an ac input voltage (voltage between an ACL terminal and an ACN terminal) is a positive half wave, and outputting a high level signal when the ac input voltage is a negative half wave. The ZERO-crossing signal ZERO is presented as a 50Hz square wave signal, and the rising edge and the falling edge of the square wave represent the ZERO-crossing points of the alternating current power supply signal.

In addition, in a household electrical system, the amplitude of an alternating current power supply signal needs to be detected, and a later-stage system can control a load according to the alternating current detection signal. In a common alternating current detection scheme, an electrolytic capacitor is adopted to filter an alternating current power supply signal, and a control circuit acquires and detects the amplitude of the alternating current power supply signal by combining a voltage signal after filtering with a proportional relation, but the electrolytic capacitor in the detection scheme has high cost.

In the field of household appliances, the existing AC-DC non-isolated power supply system basically adopts a floating structure in order to meet the collinear requirement of the silicon controlled rectifier and the simplicity and convenience of design, so that the control circuit controls the control voltage of the power switch of the 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 the power ground is changed. The zero-crossing point of the alternating current power supply signal is referenced to the ground, so that the zero-crossing detection of the alternating current input signal cannot be integrated in a chip of an AC-DC non-isolated power supply system in the field of the existing household appliances, and the alternating current detection function cannot be realized. These two functions can only be achieved by peripheral discrete devices, which adds cost and bulk to the system fabrication.

In view of the above, it is desirable to provide a new structure or control method to solve at least some of the above problems.

SUMMERY OF THE UTILITY MODEL

At least to one or more problems in the background art, the utility model provides a power supply chip and non-isolated electrical power generating system and control circuit.

According to an aspect of the utility model, a can be used to the power supply chip for the household electrical appliances power supply, have: the first pin is externally coupled with a first output end of the rectifying circuit, wherein the input end of the rectifying circuit receives an alternating current power supply signal; the second pin is externally grounded and is commonly grounded with the second output end of the rectifying circuit; the third pin is externally coupled with the output capacitor and provides output voltage; the fourth pin provides a zero-crossing signal which represents the zero-crossing state of the alternating current power supply signal; and a fifth pin for providing an alternating current detection signal, wherein the alternating current detection signal is used for representing the amplitude of the alternating current power supply signal.

In one embodiment, the power supply chip further has a sixth pin for coupling the first capacitor to the outside.

In one embodiment, a power supply chip includes: the switching device is provided with a first end, a second end and a control end, wherein the first end of the switching device is coupled with the first pin, and the second end of the switching device is coupled with the sixth pin; the linear device is provided with a first end and a second end, wherein the first end of the linear device is coupled with the second end of the switch device, and the second end of the linear device is coupled with the third pin; the detection processing circuit is provided with an input end, a first output end, a second output end and a third output end, wherein the input end of the detection processing circuit is coupled with the first pin, the first output end of the detection processing circuit is coupled with the fourth pin, and the second output end of the detection processing circuit is coupled with the fifth pin; 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.

In one embodiment, the switching device is turned on in a valley position of the rectified power signal.

In one embodiment, the detection processing circuit includes: the resistance voltage division circuit is provided with an input end and an output end, wherein the input end of the resistance voltage division circuit is coupled with the first pin; 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 resistance voltage division circuit, and the output end of the zero-crossing detection circuit is coupled with the fourth pin; 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 resistance voltage division 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 is coupled with the fifth pin.

In one embodiment, the zero-crossing detection circuit includes a transistor, a base of the transistor is coupled to the output terminal of the resistance voltage division circuit, an emitter of the transistor is grounded, and a collector of the transistor is coupled to a voltage source through a resistance and serves as the output terminal of the zero-crossing detection circuit.

In one embodiment, an alternating current 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 resistance voltage dividing 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 coupled with the fifth pin.

According to another aspect of the present invention, a power supply chip includes: the switching device is provided with a first end, a second end and a control end, wherein the first end of the switching device is coupled with the input pin of the power supply chip, and the second end of the switching device is coupled with the intermediate voltage pin of the power supply chip; the linear device is provided with a first end and a second end, wherein the first end of the linear device is coupled with the second end of the switch device, and the second end of the linear device is coupled with an output pin of the power supply chip and used 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 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 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.

According to another aspect of the present invention, a non-isolated power supply chip for supplying power to a household appliance has: the input pin is externally coupled with the output end of the rectifying circuit, and the input end of the rectifying circuit is coupled with an alternating current power supply signal; the grounding pin is externally grounded; an output pin for providing an output voltage; the zero-crossing signal output pin is used for providing a zero-crossing signal, and the zero-crossing signal represents the zero-crossing state of the alternating current power supply signal; and the alternating current detection output pin is used for providing an alternating current detection signal, and the alternating current detection signal is a voltage signal used for representing the amplitude of the alternating current power supply signal.

In one embodiment, the power supply chip further has an intermediate voltage pin for coupling the first capacitor to the outside.

According to another aspect of the present invention, a non-isolated power system for a household 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 supply chip as described in any of the above embodiments; a first capacitor; and an output capacitor for providing an output voltage.

According to another aspect of the present invention, a 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 switch driving circuit is coupled with the detection processing circuit and controls the control end of the switch device, wherein the first end of the switch device receives the rectified power supply signal, the second end of the switch device is coupled with the first end of the linear device, and the second end of the linear device provides output voltage.

The utility model provides a power supply chip and non-isolated electrical power generating system and control circuit can be simultaneously integrated zero cross detection and AC in non-isolated AC-DC system and detect the function, provide convenience for the extension of household electrical appliances later stage circuit function. And a high-voltage electrolytic capacitor behind a bridge is not needed, a peripheral circuit is simple, the system volume and the cost are greatly reduced, and the system reliability is improved.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 illustrates a zero crossing detection scheme for an isolated power supply;

fig. 2 shows a schematic diagram of a non-isolated AC-DC power supply system according to an embodiment of the present invention;

fig. 3 shows a circuit schematic of a non-isolated AC-DC power supply system according to an embodiment of the present invention;

fig. 4 is a schematic diagram illustrating 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 present invention;

fig. 6 is a schematic block diagram of an ac signal detection circuit according to an embodiment of the present invention.

Detailed Description

For further understanding of the present invention, preferred embodiments of the present invention will be described below with reference to examples, but it should be understood that these descriptions are only for the purpose of further illustrating the features and advantages of the present invention, and are not intended to limit the claims of the present invention.

The description in this section is for exemplary embodiments only, and the present invention is not limited to the scope of the embodiments described. Combinations of different embodiments, or technical features of different embodiments, or similar prior art means, or technical features of embodiments, may be substituted for each other within the scope of the present invention.

The term "coupled" or "connected" in this specification includes both direct and indirect connections. An indirect connection is a connection made through an intermediate medium, such as a conductor, wherein the electrically conductive medium may contain parasitic inductance or parasitic capacitance, or through an intermediate circuit or component as described in the embodiments in the specification; indirect connections may also include connections through other active or passive devices that perform the same or similar function, such as connections through switches, signal amplification circuitry, follower circuitry, etc., circuits or components. "plurality" or "plurality" 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 present invention. Preferably, the non-isolated power supply system is configured to supply power to the Load based on the alternating current Vac. The non-isolated power supply system does not adopt 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 end of the rectifying circuit 21 receives the ac power signal Vac, wherein a first input end of the rectifying circuit 21 is coupled to a first end, such as an ACN end, of the ac power signal Vac, and a second input end of the rectifying circuit 21 is coupled to a second end, such as an ACL end, of the ac power signal Vac. The output of the rectifying circuit 21 provides a rectified power signal Vbus. 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 first pin is input pin IN, is coupled rectifier circuit 21's output for externally receive the rectification power signal Vbus that rectifier circuit 21 exported. The second pin is a ground pin GND for grounding to the outside, which is common to the power ground GND of the rectifier circuit 21, i.e., the rectified power signal Vbus, without using a floating structure. And the third pin is an output pin VO and is used for providing output voltage and supplying power to a Load. Wherein the output pin VO may be coupled to the output capacitor Co and the Load to ground GND. In one embodiment, the output capacitor Co may be part of the Load. The fourth pin is a ZERO-crossing signal output pin ZERO for providing a ZERO-crossing signal ZERO, which represents the ZERO-crossing state of the alternating current power supply signal Vac and can be used for providing signals for subsequent thyristors or other devices such as a relay. The fifth pin is an AC detection output pin AC for providing an AC detection signal, which is a voltage signal for representing the amplitude of the AC power signal Vac. The AC 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, and the intermediate voltage pin VDD is used for being externally coupled to the first capacitor C1 and providing an intermediate power supply voltage for the power supply chip 20. Preferably, the linear devices in the power supply chip 20 may be supplied with input voltages. 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 sequence here may not correspond to the pin sequence shown in fig. 2, and the pin sequence here is only used for illustration, and is not used to indicate the position and specific arrangement sequence of any pin arrangement, and shall cover any arrangement manner of pin positions. Preferably, the power supply chip 20 is a chip packaged by a packaging process. In another embodiment, the circuits in the power supply chip 20 can also be fabricated on the same semiconductor substrate as an unpackaged semiconductor die.

Fig. 3 shows a circuit schematic diagram of a non-isolated AC-DC power supply system according to an embodiment of the present 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 the first pin IN is coupled with the output of rectifier circuit, and the intermediate voltage pin VDD is coupled with first electric capacity C1, and ground pin GND is coupled with the power ground of rectifier circuit, and output pin VO can be used to provide power supply source Vout for the electronic parts IN the household electrical appliances, and ZERO cross signal output pin ZERO and alternating current detection output pin AC are used for providing ZERO cross signal and alternating current detection signal for other circuits respectively.

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 terminal, a second terminal and a control terminal, the first terminal of the switching device Q1 is coupled to the input pin IN, that is, the output terminal of the rectifying circuit is configured to receive the rectified power signal Vbus, and the second terminal of the switching device Q1 is coupled to the intermediate voltage pin VDD, and is configured to be coupled to the first capacitor C1 to provide the intermediate power 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 are voltage signal-processed 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, and 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. 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, and the output terminal of the switch driving circuit 33 is coupled to the control terminal of the switching device Q1 for controlling the switching device Q1 to be turned on and off. In one embodiment, the switch drive 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 supply signal Vbus is a half-wave waveform of the illustrated ac wave after rectification. Wherein the switching device Q1 is switched on at the valley position of the rectified supply signal Vbus. The corresponding energy is transferred to the first capacitor C1 and the subsequent 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 voltage of the linear circuit 31 is ensured to be between the lowest working voltage and the highest withstand voltage.

Continuing with the description of fig. 3, the output terminal of the linear circuit 31 at the subsequent stage is connected to the output capacitor Co, and the linear circuit 31 performs processing based on the intermediate supply voltage VDD to obtain the stable dc output voltage Vout. In another embodiment, the linear circuit 31 may be replaced with another DC-DC voltage regulator circuit.

In one embodiment, the output voltage Vout has a magnitude of 3-50 volts and the average voltage magnitude of the rectified supply signal Vbus is approximately 220 volts. Through the topology, the conversion from the commercial power alternating current Vac to the low-voltage-stabilizing source can be realized without adopting 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 is implemented by the power ground GND instead of the floating ground.

The detection processing circuit 32 includes a resistance voltage dividing circuit, a zero-cross detection circuit 321, and an alternating-current signal detection circuit 322. The resistance voltage division circuit comprises two resistors connected IN series, the input end of the resistance voltage division circuit is coupled with a first pin IN and used for receiving a rectification power supply signal Vbus, the resistance voltage division circuit is used for providing a detection signal Vd which is IN direct proportion to the rectification power supply signal Vbus, and the ratio of the Vbus to the Vd is set by the resistance value of the resistance voltage division 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 voltage divider circuit, and the output terminal of the ZERO-crossing detection circuit 321 is coupled to the fourth pin ZERO for providing a ZERO-crossing signal and is also 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 present 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 with the output end of the resistance bleeder circuit and receives a detection signal Vd proportional to the rectified power signal Vbus, the emitter e of the triode is coupled with the power ground GND or coupled with the power ground GND through a resistor, the collector c of the triode is coupled with the first end of a resistor R, and the second end of the resistor R is coupled with a voltage source V1. The voltage source V1 may be an intermediate supply voltage VDD. The collector c of the triode provides a ZERO-crossing signal ZERO. Namely, the collector c of the triode is coupled with the voltage source V1 through the resistor R and is used as the output end of the zero-crossing detection circuit. When the detection signal Vd is smaller than the switching-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 at a high level; when the detection signal Vd is larger than the turn-on threshold voltage of the triode, the triode is conducted, the collector electrode c of the triode is grounded GND, and the ZERO-crossing signal ZERO is at a low level. Thus, when the rectified power signal Vbus is at the bottom of the valley, the ZERO-crossing signal ZERO exhibits a high level pulse for indicating the ZERO-crossing position of the alternating power signal Vac.

Continuing with the description of fig. 3, the AC signal detecting circuit 322 has a first input terminal, a second input terminal and an output terminal, wherein the first input terminal is coupled to the output terminal of the resistor voltage dividing circuit, the second input terminal is coupled to the output terminal of the zero-crossing detecting circuit 321, and the output terminal of the AC signal detecting circuit 322 is coupled to the fifth pin AC for providing an AC detecting signal indicating the amplitude of the AC power signal Vac. Preferably, the alternating current detection signal AC is indicative of a voltage average of the rectified power supply signal Vbus. The AC detection signal AC may also indicate the voltage amplitude, real-time variation value or periodically sampled value of the AC power signal Vac or the rectified power signal Vbus.

Fig. 6 shows a schematic diagram of an ac signal detection circuit according to an embodiment of the present invention. The alternating-current signal detection circuit includes a time signal sampling circuit 61, a voltage sampling circuit 62, and an information processing circuit 63. Wherein an input terminal of the time signal sampling circuit 61 is coupled to an output terminal of the ZERO-crossing detection circuit for receiving the ZERO-crossing signal ZERO, the time signal sampling circuit 61 generates a pulse signal TP representing time information based on the ZERO-crossing signal ZERO and provides the pulse signal TP at an output terminal of the time signal sampling circuit 61. In one embodiment, the time signal sampling circuit 61 includes a delay circuit for delaying 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 quarter of a power frequency period to generate a primary pulse after receiving the high-level pulse of the ZERO-crossing signal ZERO. The delay circuit can also generate a plurality of pulses within a half power frequency period in time 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 resistance voltage-dividing 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 sampling 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 to the outside. In one embodiment, the information processing circuit 63 provides the corresponding alternating current detection signal AC based on the voltage sampling signal Vp and according to the 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 supply signal Vbus. The AC detection signal AC may also be fitted to represent the voltage value of the rectified power supply signal Vbus in real time according to the sampled voltage sampling signal Vp.

Through 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 realizing the integration of 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 electrolytic capacitor behind a rectifying circuit. The method solves the defect that the zero-crossing detection and AC detection functions cannot be integrated at the same time when a non-isolated AC-DC voltage conversion system becomes mainstream gradually in the field of household appliance power at present. The method provides convenience for the expansion of functions of components such as a motor and the like of a rear-stage circuit in the household appliance. Meanwhile, the system periphery is simplified, and the cost is greatly reduced. After system integration is carried out, a customer does not need to additionally build a zero-crossing circuit and an AC detection circuit by adopting discrete devices, the system periphery is simplified to a greater extent, and the design difficulty is reduced. And electromagnetic compatibility (EMC) performance is also optimized due to simplification of peripheral circuits and improvement of integration. Because peripheral zero-crossing and AC detection lines have higher requirements on the routing of a Printed Circuit Board (PCB), poor peripheral circuit routing easily influences the EMC performance of the system. And under the condition of meeting the function, 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 the zero-crossing signal is ensured through a mature semiconductor process and a high-standard sealing and testing program. In the solution of the above embodiment, the process requirements on the semiconductor high and low voltage isolation and signal processing are low, and only the switching device Q1 (usually, a metal oxide semiconductor field effect transistor) has a high withstand voltage requirement, while the linear device LDO with a high accuracy requirement does not have a high withstand voltage requirement, and the high and low voltages are physically isolated by two circuits, which is beneficial to improving the control accuracy of LDO signals and reducing the manufacturing cost.

The description and applications of the present invention are illustrative and are not intended to limit the scope of the invention to the embodiments described above. The descriptions related to the effects or advantages in the specification may not be reflected in practical experimental examples due to uncertainty of specific condition parameters or influence of other factors, and the descriptions related to the effects or advantages are not used for limiting the scope of the invention. Variations and modifications of the embodiments disclosed herein are possible, and alternative and equivalent various components of the embodiments will be apparent to those skilled 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 components, materials, and parts, 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 present invention.

Claims (10)

1. A power supply chip, characterized in that the power supply chip has:

the first pin is externally coupled with a first output end of the rectifying circuit, wherein the input end of the rectifying circuit receives an alternating current power supply signal;

the second pin is externally grounded and is commonly grounded with the second output end of the rectifying circuit;

the third pin is externally coupled with the output capacitor and provides output voltage;

the fourth pin provides a zero-crossing signal which represents the zero-crossing state of the alternating current power supply signal; and

and the fifth pin is used for providing an alternating current detection signal, and the alternating current detection signal is used for representing the amplitude of the alternating current power supply signal.

2. The power supply chip of claim 1, wherein the power supply chip further has a sixth pin for coupling the first capacitor to the outside.

3. The power supply chip of claim 1, wherein the power supply chip comprises:

the switching device is provided with a first end, a second end and a control end, wherein the first end of the switching device is coupled with the first pin, and the second end of the switching device is coupled with the sixth pin;

the linear device is provided with a first end and a second end, wherein the first end of the linear device is coupled with the second end of the switch device, and the second end of the linear device is coupled with the third pin;

the detection processing circuit is provided with an input end, a first output end, a second output end and a third output end, wherein the input end of the detection processing circuit is coupled with the first pin, the first output end of the detection processing circuit is coupled with the fourth pin, and the second output end of the detection processing circuit is coupled with the fifth pin; and

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.

4. The power supplying chip of claim 3, wherein the switching device is turned on at a valley position of the rectified power signal.

5. The power supply chip of claim 3 wherein the detection processing circuit comprises:

the resistance voltage division circuit is provided with an input end and an output end, wherein the input end of the resistance voltage division circuit is coupled with the first pin;

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 resistance voltage division circuit, and the output end of the zero-crossing detection circuit is coupled with the fourth pin; 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 resistance voltage division 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 is coupled with the fifth pin.

6. The power supply chip of claim 5, wherein the zero crossing detection circuit comprises a transistor, a base of the transistor is coupled to the output of the resistor divider circuit, an emitter of the transistor is grounded, and a collector of the transistor is coupled to the voltage source through a resistor and serves as the output of the zero crossing detection circuit.

7. The power supply chip of claim 5, wherein the alternating current 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 resistance voltage dividing 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

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 coupled with the fifth pin.

8. A power supply chip is a non-isolated power supply chip for supplying power to household appliances, and is characterized in that the power supply chip comprises: the input pin is externally coupled with the output end of the rectifying circuit, and the input end of the rectifying circuit is coupled with an alternating current power supply signal;

the grounding pin is grounded;

an output pin for providing an output voltage;

the zero-crossing signal output pin is used for providing a zero-crossing signal, and the zero-crossing signal represents 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 a voltage signal for representing the amplitude of the alternating current power supply signal.

9. The power supply chip of claim 8 wherein the power supply chip further has an intermediate voltage pin for coupling the first capacitor to the outside.

10. 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 1-9;

a first capacitor; and

and the output capacitor is used for providing an output voltage.

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