CN212727478U

CN212727478U - Power supply circuit, circuit module and electronic package

Info

Publication number: CN212727478U
Application number: CN202021210499.6U
Authority: CN
Inventors: 庄智勇; 张波; 王晓佳
Original assignee: Shenzhen Biyi Microelectronics Co Ltd
Current assignee: Shenzhen Biyi Microelectronics Co Ltd
Priority date: 2020-06-24
Filing date: 2020-06-24
Publication date: 2021-03-16
Anticipated expiration: 2030-06-24

Abstract

The utility model provides a supply circuit, circuit module and electronic packaging body. The power supply circuit includes: the driving and adjusting circuit comprises a power device, wherein the power device is connected with the load in series, and the driving and adjusting circuit drives the load based on the conducting state of the power device; a capacitor device; and the current limiting circuit is connected with the capacitance device in series, and the current limiting circuit and the capacitance device which are connected in series are connected with the power device and the load which are connected in series in parallel. The utility model provides a supply circuit, circuit module and electronic packaging body can be convenient for satisfy the current harmonic in the new electromagnetic standard of Europe and do not have the stroboscopic requirement, have the external circuit who simplifies simultaneously.

Description

Power supply circuit, circuit module and electronic package

Technical Field

The utility model relates to an electron field, concretely but not limited to relate to a supply circuit, circuit module and electron packaging body.

Background

The European Committee for electrotechnical standardization (CENELEC) promulgates a new standard for electromagnetic compatibility, IEC61000-3-2-2019 in 2019. The standard requires that the Power Factor (PF) of the mains power supply system be greater than 0.7 and that the 3 rd harmonic of the input current be less than 86% and the 5 th harmonic less than 61%.

The existing common switching power supply circuit and linear power supply circuit are difficult to meet the requirements.

SUMMERY OF THE UTILITY MODEL

To one or more of the problems or conditions presented above, the present invention provides a power supply circuit, a circuit module, and an electronic package.

According to an aspect of the present invention, a power supply circuit for supplying power to a load has a first input terminal and a second input terminal, and the power supply circuit includes: the driving and adjusting circuit comprises a power device, the power device and a load are connected in series, the power device and the load which are connected in series are coupled between a first input end and a second input end, and the driving and adjusting circuit drives the load based on the conducting state of the power device; a capacitor device; and a current limiting circuit connected in series with the capacitive device, the series connected current limiting circuit and the capacitive device being coupled between the first input terminal and the second input terminal, the current limiting circuit limiting a current flowing through the capacitive device to below a preset reference current.

In one embodiment, the load comprises a Light Emitting Diode (LED).

In one embodiment, the first input terminal is coupled to a first output terminal of the rectifying circuit, and the second input terminal is coupled to a second output terminal of the rectifying circuit.

In one embodiment, the power device has a first terminal, a second terminal, and a control terminal, wherein the driving adjustment circuit further comprises: the first resistor is provided with a first end and a second end, wherein the first end of the first resistor is coupled with the second end of the power device, the second end of the first resistor is coupled with the second input end of the power supply circuit, the first end of the power device is coupled with the first end of the load, and the other end of the load is coupled with the first input end of the power supply circuit; and the first error amplifying circuit is provided with a first input end, a second input end and an output end, wherein the first input end of the first error amplifying circuit is coupled with the first end of the first resistor, the second input end of the first error amplifying circuit is coupled with the first reference signal, and the output end of the first error amplifying circuit is coupled with the control end of the power device.

In one embodiment, the current limiting circuit includes a current limiting transistor having a body diode with an anode coupled to the second input of the power supply circuit and a cathode coupled to the capacitive device. Preferably, no discrete diode is coupled between the second input terminal of the supply circuit and the low side terminal of the capacitive device.

In one embodiment, the capacitive device has a first terminal and a second terminal, the first terminal of the capacitive device is coupled to a first input terminal of the power supply circuit, and the current limiting circuit includes: a current-limiting transistor having a first terminal, a second terminal, and a control terminal, wherein the first terminal of the current-limiting transistor is coupled to the second terminal of the capacitor device; the first end of the second resistor is coupled with the second end of the current-limiting transistor, and the second end of the second resistor is coupled with the second input end of the power supply circuit; and a second error amplifying circuit having a first input terminal, a second input terminal and an output terminal, wherein the first input terminal of the second error amplifying circuit is coupled to the first terminal of the second resistor, the second input terminal of the second error amplifying circuit is coupled to a second reference signal representing the predetermined reference current, and the output terminal of the second error amplifying circuit is coupled to the control terminal of the current-limiting transistor.

In one embodiment, the current-limiting transistor comprises an N-type metal oxide semiconductor field effect transistor, a source of the current-limiting transistor is coupled to the capacitor device, and a drain of the current-limiting transistor is coupled to the second resistor. In one embodiment, the power device includes an N-type metal oxide semiconductor field effect transistor, a source of the power device is coupled to the first resistor, and a drain of the power device is coupled to the load.

According to another aspect of the present invention, a circuit module for supplying power to a load, includes the power supply circuit and the rectifier circuit as described in any of the above embodiments, wherein the rectifier circuit has an input end, a first output end and a second output end, wherein the input end of the rectifier circuit receives the mains ac or is coupled to the dimmer, the first output end of the rectifier circuit is coupled to the first input end of the power supply circuit, and the second output end of the rectifier circuit is coupled to the second input end of the power supply circuit.

According to still another aspect of the present invention, an electronic package, comprises: the load pin is coupled with the low-order end of the load, wherein the high-order end of the load is coupled with the input power supply; the capacitor pin is coupled with the low-order end of the capacitor device, and the high-order end of the capacitor device is coupled with an input power supply; and a reference ground pin coupled to a reference ground.

In one embodiment, the electronic package further comprises a first current limiting pin coupled to a first end of a first resistor, and the other end of the first resistor is coupled to a reference ground; and a second current-limiting pin coupled to a first end of a second resistor, the other end of the second resistor being coupled to a ground reference.

The utility model provides a supply circuit, circuit module and electronic packaging body can be convenient for satisfy the current harmonic in the new electromagnetic standard of Europe and do not have the stroboscopic requirement, have the external circuit who simplifies simultaneously.

Drawings

Fig. 1 shows a supply circuit according to an embodiment of the invention;

fig. 2 shows a schematic diagram of a waveform according to an embodiment of the invention;

fig. 3 shows an application circuit schematic diagram of a power supply system 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 circuits, follower circuits, and so on. "plurality" or "plurality" means two or more. "A and/or B" means that A may be, B may be, or both A and B may be included.

Fig. 1 shows a power supply system according to an embodiment of the present invention, for supplying power to a load 13. The power supply system includes a power supply circuit 100. The supply circuit 100 has a first input Vin and a second input GND. The power supply circuit 100 includes a first current loop and a second current loop. The first current loop and the second current loop are connected in parallel with each other and are coupled between the first input terminal Vin and the second input terminal GND. The first current loop comprises a load 13 and a drive regulation circuit 11 connected in series for regulating the current through the load 13. The second current loop comprises a capacitive device Co and a current limiting circuit 12 connected in series, the current limiting circuit 12 being arranged to control the current through the capacitive device Co.

The regulating circuit 11 is driven, including a power device Q1. The power device Q1 is used to be connected in series with the load 13, the series-connected power device Q1 and the load 13 are coupled between the first input terminal Vin and the second input terminal GND, and the driving regulation circuit 11 is used to drive the load 13 based on the on state of the power device Q1.

The current limiting circuit 12 is connected in series with the capacitive device Co, the series connected current limiting circuit 12 and the capacitive device Co are coupled between the first input terminal Vin and the second input terminal GND, and the current limiting circuit 12 is configured to limit a current flowing through the capacitive device Co below a predetermined reference current.

In the illustrated embodiment, the load 13 includes a Light Emitting Diode (LED).

The power supply system shown in fig. 1 further includes a rectifier circuit 14. The input end of the rectifying circuit 14 is used for receiving the mains alternating current Vac, or receiving the mains alternating current Vac through the dimmer. The rectifier circuit 14 has two outputs: a first output terminal and a second output terminal. A first output terminal of the rectifying circuit 14 is coupled to a first input terminal Vin of the power supply circuit 100, and a second output terminal of the rectifying circuit 14 is coupled to a second input terminal GND of the power supply circuit 100 as a ground reference terminal of the power supply circuit. That is, the first input terminal Vin of the power supply circuit 100 is coupled to the first output terminal of the rectifying circuit 14, and the second input terminal GND of the power supply circuit 100 is coupled to the second output terminal of the rectifying circuit 14.

The driving adjustment circuit 11 includes a power device Q1, a first error amplifier circuit 111, and a first resistor R1. The first terminal of the power device Q1 is coupled to the load 13, the first terminal of the first resistor R1 is coupled to the second terminal of the power device Q1, the second terminal of the first resistor R1 is coupled to the second input terminal GND of the power supply circuit 100, the first terminal of the power device Q1 is coupled to the first terminal of the load 13, and the other terminal of the load 13 is coupled to the first input terminal Vin of the power supply circuit 100. The first error amplifier circuit 111 has a first input terminal, a second input terminal, and an output terminal, wherein the first input terminal of the first error amplifier circuit 111 is coupled to the first terminal of the first resistor R1, the second input terminal of the first error amplifier circuit 111 is coupled to the first reference signal Vref1, and the output terminal of the first error amplifier circuit 111 is coupled to the control terminal of the power device Q1. The first error amplifier circuit 111 is used for controlling the current flowing through the Q1 to be at a preset current value Iref 2. In the illustrated embodiment, the power device Q1 includes an N-type mosfet, and the first error amplifier circuit 111 controls the current flowing from the drain to the source of the Q1 to be close to a preset value represented by the first reference signal Vref 1.

In the drive regulation circuit shown in fig. 1, the power device Q1 operates in a linear state. However, in other embodiments, the drive regulation circuit may employ any other form of topology or circuit for providing the required stable drive current to the load.

The capacitor device Co has a first terminal and a second terminal, wherein the first terminal of the capacitor device Co is coupled to the first input terminal Vin of the power supply circuit 100. The current limiting circuit 12 includes a current limiting transistor Q2, a second resistor R2, and a second error amplifying circuit 112. The current-limiting transistor Q2 has a first terminal, a second terminal, and a control terminal, wherein the first terminal of the current-limiting transistor Q2 is coupled to the second terminal of the capacitor device Co. The second resistor R2 has a first terminal and a second terminal, wherein the first terminal of the second resistor R2 is coupled to the second terminal of the current-limiting transistor Q2, and the second terminal of the second resistor R2 is coupled to the second input terminal GND of the power supply circuit 100. The second error amplifier circuit 112 has a first input terminal, a second input terminal and an output terminal, wherein the first input terminal of the second error amplifier circuit 112 is coupled to the first terminal of the second resistor R2, the second input terminal of the second error amplifier circuit 112 is coupled to a second reference signal Vref2 representing a predetermined reference current, and the output terminal of the second error amplifier circuit 112 is coupled to the control terminal of the current-limiting transistor Q2. In the illustrated embodiment, the current limiting transistor Q2 comprises an nmos field effect transistor having a first terminal that is a source, a second terminal that is a drain, and a control terminal that is a gate.

When the voltage output by the rectifying circuit 14 is high, the current flows from the input terminal of the rectifying circuit 14 to the output terminal of the rectifying circuit 14, the capacitor device Co is charged, and the charging current flows from the first input terminal Vin to the capacitor device Co, at this time, the second error amplifying circuit 112 controls the channel formed under the gate of the current limiting transistor Q2, and the charging current flows from the source to the drain of the current limiting transistor Q2 and is limited to the preset reference current I1.

At this time, the input current Iin at the first input terminal Vin of the power supply circuit is Iref1+ Iref2, where Iref1 is the current value flowing through the load 13, i.e., the current flowing from the drain to the source of the power device Q1, and Iref2 is the preset current value represented by the second reference signal Vref 2. At the moment, Iin is a fixed value, the current is stable, the amount of current of higher harmonics is low, and the requirements that 3-order harmonics of the input current are less than 86 percent and 5-order harmonics are less than 61 percent can be met.

When the absolute value of the ac power Vac is low, the rectifying circuit 14 stops operating, the diode in the rectifying circuit 14 prevents the current from flowing from the output terminal of the rectifying circuit 14 to the input terminal of the rectifying circuit 14, and at this time, the capacitor device Co discharges, and the discharge current flows from the high-end of the capacitor device Co to the load 13 through the first input terminal Vin and is limited to the preset current value Iref1 represented by the reference signal Vref 1. While a discharge current Iref1 flows from the second terminal of the second resistor R2 to the first terminal thereof. At this time, the error amplifying circuit 112 controls the voltage at the control terminal of the current-limiting transistor Q2 to be in a low-voltage state, no channel is formed in the region under the gate of the current-limiting transistor Q2, and the discharge current Iref1 flows from the drain to the source through the body diode of the current-limiting transistor Q2 to form a current path. According to the scheme, an additional diode device is not needed to be adopted in the second current loop, the circuit structure is simplified, and the cost is reduced.

In the embodiment shown in fig. 1, both the power device Q1 and the current limiting transistor Q2 employ mosfets. In other embodiments, different types of transistors may be used for the power device Q1 and the current limiting transistor Q2. The current limiting transistor Q2 may also include other types of transistors that integrate a body diode for passing a discharge current.

The circuit module for supplying power to a load according to an embodiment of the present invention includes the power supply circuit 100 and the rectification circuit 14 as described in any of the above embodiments. The rectifying circuit 14 has an input terminal, a first output terminal and a second input terminal, wherein the input terminal of the rectifying circuit 14 is used for receiving the commercial power ac or receiving the commercial power ac through the dimmer, the first output terminal of the rectifying circuit 14 is coupled to the first input terminal Vin of the power supply circuit 100, and the second output terminal of the rectifying circuit 14 is coupled to the second input terminal GND of the power supply circuit 100.

In the illustrated embodiment, the first resistor R1 and the second resistor R2 each comprise a discrete device. In other embodiments, the first resistor R1 or the second resistor R2 may include a plurality of resistor devices connected in parallel or in series. In another embodiment, the first resistor R1 and the second resistor R2 are integrated with the power device Q1 and the current limiting transistor Q2, respectively.

Fig. 2 shows a schematic waveform diagram according to an embodiment of the present invention. The waveforms are ac input voltage Vac waveform, ac input current Iac waveform, dc input current Iin, load current Iload, and charge-discharge current I1 waveform through the current limiting transistor, respectively. By controlling in the embodiment of fig. 1, the ac input current Iac has a waveform as shown, in which the ac input current Iac reaches the peak current state immediately before the conduction angle of 60 degrees, and it is easy to satisfy the requirement that the current reaches at least 5% of the current peak value before the conduction angle of 60 degrees, the current reaches the maximum value before 65 degrees, and at 90 degrees, the current value cannot be less than 5% of the current peak value, and the third harmonic is less than 86%, and the fifth harmonic is less than 61%. The requirements of new European standards are easily met.

Fig. 3 shows an application circuit schematic diagram of a power supply system according to an embodiment of the present invention. The power supply system includes a rectifying circuit 34, a load 33, a capacitor device Co, an electronic package 300, a first resistor R1, and a second resistor R2. The electronic package 300 has a load pin LED, a capacitor pin CL, a first current limit pin CS1, a second current limit pin CS2, and a ground reference pin GND. Wherein the load pin LED is used for coupling with the low terminal of the load 33, and the high terminal of the load 33 is used for coupling with the input power Vin. The capacitor pin CL is used for coupling with a low terminal of a capacitor device Co, wherein a high terminal of the capacitor device Co is used for coupling with an input power Vin. The first current-limiting pin CS1 is coupled to a first terminal of a first resistor R1, and the other terminal of the first resistor R1 is coupled to the ground GND. The second current-limiting pin CS2 is coupled to a first terminal of a second resistor R2, and the other terminal of the second resistor R2 is coupled to the ground GND. The ground reference pin GND is used for coupling to ground reference. The current-limiting transistor in the power supply integrates a body diode, the discharge current of the capacitor device Co forms a loop through the body diode, the system eliminates the use of a discrete diode, the number of peripheral devices is very small, and the system cost is reduced.

In another embodiment, the electronic package 300 further has an input power pin Vin for coupling an input voltage Vin for powering control circuits in the electronic package. In other embodiments, signals from other locations, such as the electrical signal on the load pin LED, may be used to power the control circuitry.

In another embodiment, the power device Q1 and/or the current limiting transistor Q2 in the electronic package 300 are integrated on the same semiconductor substrate as the corresponding sampling resistor, and the electronic package does not include the first current limiting pin CS1 and/or the second current limiting pin CS 2. Can be used to further simplify the circuitry.

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

1. A power supply circuit for providing power to a load, having a first input terminal and a second input terminal, the power supply circuit comprising:

the driving and adjusting circuit comprises a power device, the power device and a load are connected in series, the power device and the load which are connected in series are coupled between a first input end and a second input end, and the driving and adjusting circuit drives the load based on the conducting state of the power device;

a capacitor device; and

and the current limiting circuit is connected with the capacitance device in series, and the current limiting circuit and the capacitance device which are connected in series are coupled between the first input end and the second input end.

2. The power supply circuit of claim 1 wherein the load comprises a light emitting diode.

3. The power supply circuit of claim 1 wherein the first input is coupled to a first output of the rectifying circuit and the second input is coupled to a second output of the rectifying circuit.

4. The power supply circuit of claim 1 wherein the current limiting circuit comprises a current limiting transistor having a body diode with an anode coupled to the second input of the power supply circuit and a cathode coupled to the capacitive device.

5. The power supply circuit of claim 1 wherein the power device has a first terminal, a second terminal, and a control terminal, and wherein the drive regulation circuit further comprises:

the first resistor is provided with a first end and a second end, wherein the first end of the first resistor is coupled with the second end of the power device, the second end of the first resistor is coupled with the second input end of the power supply circuit, the first end of the power device is coupled with the first end of the load, and the other end of the load is coupled with the first input end of the power supply circuit; and

the first error amplifying circuit is provided with a first input end, a second input end and an output end, wherein the first input end of the first error amplifying circuit is coupled with the first end of the first resistor, the second input end of the first error amplifying circuit is coupled with the first reference signal, and the output end of the first error amplifying circuit is coupled with the control end of the power device.

6. The power supply circuit of claim 1 wherein the capacitive device has a first terminal and a second terminal, the first terminal of the capacitive device being coupled to a first input terminal of the power supply circuit, the current limiting circuit comprising:

a current-limiting transistor having a first terminal, a second terminal, and a control terminal, wherein the first terminal of the current-limiting transistor is coupled to the second terminal of the capacitor device;

the first end of the second resistor is coupled with the second end of the current-limiting transistor, and the second end of the second resistor is coupled with the second input end of the power supply circuit; and

and the second error amplifying circuit is provided with a first input end, a second input end and an output end, wherein the first input end of the second error amplifying circuit is coupled with the first end of the second resistor, the second input end of the second error amplifying circuit is coupled with the second reference signal, and the output end of the second error amplifying circuit is coupled with the control end of the current-limiting transistor.

7. The power supply circuit of claim 6 wherein the current limiting transistor comprises an N-type metal oxide semiconductor field effect transistor, a source of the current limiting transistor is coupled to the capacitive device, and a drain of the current limiting transistor is coupled to the second resistor.

8. The power supply circuit of claim 7 wherein the power device comprises an N-type metal oxide semiconductor field effect transistor, a source of the power device is coupled to the first resistor, and a drain of the power device is coupled to the load.

9. A circuit module for supplying a load, comprising a power supply circuit according to any one of claims 1 to 8, a rectifier circuit and a diode, wherein the rectifier circuit has an input terminal, a first output terminal and a second output terminal, wherein the input terminal of the rectifier circuit receives a mains alternating current or is coupled to a dimmer, the first output terminal of the rectifier circuit is coupled to an anode of the diode, a cathode of the diode is coupled to the first input terminal of the power supply circuit, and the second output terminal of the rectifier circuit is coupled to the second input terminal of the power supply circuit.

10. An electronic package, comprising:

the load pin is coupled with the low-order end of the load, wherein the high-order end of the load is coupled with the input power supply;

the capacitor pin is coupled with the low-order end of the capacitor device, and the high-order end of the capacitor device is coupled with an input power supply; and

and the reference ground pin is coupled with the reference ground.

11. The electronic package of claim 10, wherein the electronic package further has:

the first current-limiting pin is coupled with a first end of a first resistor, and the other end of the first resistor is coupled with a reference ground; and

and the second current-limiting pin is coupled with the first end of the second resistor, and the other end of the second resistor is coupled with the reference ground.