CN111769741A - Multi-output power supply system, control circuit thereof and electronic packaging body - Google Patents

Multi-output power supply system, control circuit thereof and electronic packaging body Download PDF

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Publication number
CN111769741A
CN111769741A CN202010709091.1A CN202010709091A CN111769741A CN 111769741 A CN111769741 A CN 111769741A CN 202010709091 A CN202010709091 A CN 202010709091A CN 111769741 A CN111769741 A CN 111769741A
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China
Prior art keywords
voltage
control circuit
output
terminal
coupled
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CN202010709091.1A
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Chinese (zh)
Inventor
俞秀峰
金伟祥
张波
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Shenzhen Kiwi Microelectronic Co ltd
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Shenzhen Kiwi Microelectronic Co ltd
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Priority to CN202010709091.1A priority Critical patent/CN111769741A/en
Publication of CN111769741A publication Critical patent/CN111769741A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1582—Buck-boost converters
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0083—Converters characterised by their input or output configuration
    • H02M1/009—Converters characterised by their input or output configuration having two or more independently controlled outputs

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention provides a multi-output power supply system, a control circuit and an electronic packaging body thereof. A multiple output power supply system comprising: the switch voltage reduction circuit comprises a power tube and is used for providing a first output voltage at a first voltage output end for driving a first load; a switch, a first end of which is coupled with the inductor of the switch voltage reduction circuit, and a second end of which provides a second output voltage at a second voltage output end for driving a second load; and a unidirectional conducting device coupled between the inductor and the first voltage output terminal. The multi-output power supply system, the control circuit and the electronic packaging body have simple structures, and simultaneously have the capacity of providing larger power and higher efficiency.

Description

Multi-output power supply system, control circuit thereof and electronic packaging body
Technical Field
The invention relates to the field of electronics, in particular but not exclusively to a multi-output power supply system, a control circuit and an electronic packaging body thereof.
Background
In electronic power supply systems, it is often necessary to provide different power supply sources for different devices in the system. One conventional method is to provide independent power supplies for different devices, but this method has a low integration level and a high system power cost. In order to improve the integration degree of a power supply system and reduce the cost of a power supply source, the requirement for a multi-output power supply system is provided.
In a conventional multi-output power supply system, a main circuit output and a sub circuit output are often arranged in a voltage conversion circuit system. The main path output is provided by a conventional voltage conversion topology. One existing method of providing a secondary power supply is to provide a low dropout linear regulator (LDO) at the output of the primary circuit. However, in this method, the range of the auxiliary output is limited due to the power consumption of the LDO, and the output with a larger power cannot be satisfied. Another prior approach is to provide multiple outputs by using an isolated voltage conversion system. However, in the isolated voltage conversion system, due to the existence of a plurality of windings, optical couplers and other devices in the transformer, the complexity of the system is high, and the cost of the system cannot be effectively reduced.
Furthermore, the interaction of the multiple output power sources makes the precision control thereof a challenge.
In view of the above, there is a need to provide a new structure or control method to solve at least some of the above problems.
Disclosure of Invention
The invention provides a multi-output power supply system, a control circuit and an electronic package thereof, which aim to solve one or more problems in the prior art.
According to one aspect of the present invention, a multiple output power supply system includes: the switching voltage reduction circuit comprises a power tube and an inductor, wherein the first end of the inductor is coupled with the power tube, and the switching voltage reduction circuit is used for providing a first output voltage at a first voltage output end to drive a first load; a switch, a first end of which is coupled to a second end of the inductor of the switch voltage-reducing circuit, a second end of which is coupled between a second voltage output end, and the second voltage output end is used for providing a second output voltage to drive a second load; and a unidirectional conducting device, wherein a first end of the unidirectional conducting device is coupled with a second end of the inductor, a second end of the unidirectional conducting device is coupled with the first voltage output end, and the unidirectional conducting device is used for enabling current to flow from the first end of the unidirectional conducting device to the second end of the unidirectional conducting device.
In one embodiment, a power supply system includes: the first control circuit generates a power tube control signal to control the power tube; and a second control circuit coupled to the second voltage output terminal for obtaining a second feedback signal representing the second output voltage, the second control circuit generating a switch control signal based on the second feedback signal and a second reference signal, the switch control signal controlling the switch to adjust the second output voltage.
In one embodiment, the second control circuit is further coupled to the first voltage output for obtaining a first feedback signal indicative of the first output voltage, and the second control circuit generates a communication signal based on the first feedback signal and the first reference signal, the communication signal being input to the first control circuit.
In one embodiment, the second control circuit has a second power supply terminal coupled to the first voltage output terminal for powering the second control circuit and obtaining the first feedback signal.
In one embodiment, the first control circuit is coupled to the first voltage output terminal for obtaining a first feedback signal indicative of the first output voltage, and the first control circuit generates the power tube control signal to adjust the first output voltage based on the first feedback signal and a first reference signal.
In one embodiment, the first control circuit has a first power supply terminal coupled to the first voltage output terminal through the second unidirectional conducting device, the first power supply terminal being configured to power the first control circuit and to obtain the first feedback signal.
In one embodiment, the second control circuit has a second power supply terminal coupled to the first voltage output terminal for powering the second control circuit.
According to another aspect of the present invention, a multiple output power supply system includes: the first voltage conversion circuit converts an input voltage into a first output voltage and provides the first output voltage at a first voltage output end for driving a first load, wherein the first voltage conversion circuit is a non-isolated voltage conversion circuit; a second voltage conversion circuit comprising a switch, wherein a first terminal of the switch is coupled to the output terminal of the first voltage conversion circuit, and a second terminal of the switch provides a second output voltage at a second voltage output terminal for driving a second load; and a unidirectional conducting device, wherein a first end of the unidirectional conducting device is coupled to the output end of the first voltage conversion circuit, and a second end of the unidirectional conducting device is coupled to the first voltage output end, and the unidirectional conducting device is used for enabling current to flow from the first end of the unidirectional conducting device to the second end of the unidirectional conducting device.
In one embodiment, the second voltage conversion circuit includes a second control circuit, a first terminal of the second control circuit is coupled to the first voltage output terminal for supplying power to the second control circuit and providing a communication signal at a second output terminal of the second control circuit based on the first output voltage; the second control circuit has a second terminal coupled to the second voltage output terminal, and the second control circuit provides a switch control signal at a first output terminal of the second control circuit for controlling the switch based on the second output voltage.
According to yet another aspect of the present invention, a control circuit for a multiple output power supply system has: a first terminal for coupling to a first voltage output terminal to receive a first output voltage to supply power to the control circuit; a second terminal for coupling to a second voltage output terminal to receive a second output voltage; a third terminal for providing a switch control signal to control the switch, wherein the first terminal of the switch is coupled to the first voltage output terminal through the one-way conduction device, and the second terminal of the switch is coupled to the second voltage output terminal; and a fourth terminal for coupling to a reference ground;
in one embodiment, the control circuit includes a switch control circuit that generates the switch control signal based on the second output voltage and a second reference signal.
In one embodiment, the control circuit further has a fifth terminal for providing a communication signal, wherein the control circuit further comprises a communication signal generation circuit that generates the communication signal based on the first output voltage and the first reference signal.
According to yet another aspect of the present invention, an electronic package for a multiple output power supply system includes a switch and a control circuit as described in the above embodiments.
According to yet another aspect of the invention, an electronic package for a multiple output power supply system has: the first pin is coupled with the first voltage output end to receive a first output voltage; the second pin is coupled with the second voltage output end to receive a second output voltage; the third pin is used for being coupled with the output end of the first voltage conversion circuit, wherein the output end of the first voltage conversion circuit is coupled with the first voltage output end through a one-way conduction device; and a fourth pin for coupling to a reference ground.
In one embodiment, the electronic package includes a switch and a switch control circuit, wherein a first terminal of the switch is coupled to the first pin, a second terminal of the switch is coupled to the second pin, and a control terminal of the switch is coupled to the switch control circuit.
In one embodiment, the switch control circuit generates the switch control signal based on the second output voltage and a second reference signal.
In one embodiment, the electronic package further has a fifth pin for providing a communication signal, wherein the fifth pin is coupled to an input of another control circuit, wherein the another control circuit is used for controlling the power transistor of the first voltage converting circuit.
In one embodiment, the electronic package includes a communication signal generation circuit that generates a communication signal based on the first output voltage and the first reference signal.
The multi-output power supply system, the control circuit and the electronic packaging body thereof are used for enabling the system to have a simple structure, and meanwhile have the capacity of providing high power and high efficiency.
Drawings
FIG. 1 shows a schematic diagram of a multiple output power supply system according to an embodiment of the invention;
FIG. 2 shows a schematic diagram of a power supply system according to an embodiment of the invention;
FIG. 3 shows a schematic diagram of a power supply system according to another embodiment of the invention;
FIG. 4 shows a power supply system circuit schematic according to an embodiment of the invention;
FIG. 5 shows a signal waveform diagram according to an embodiment of the invention;
FIG. 6 shows a schematic diagram of a power supply system including an electronic package, in accordance with an embodiment of the invention;
fig. 7 shows a schematic diagram of a power supply system including an electronic package according to another embodiment of the invention.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
The description in this section is for several exemplary embodiments only, and the present invention is not limited only to the scope of the embodiments described. Combinations of different embodiments, and substitutions of features from different embodiments, or similar prior art means may be substituted for or substituted for features of the embodiments shown and described.
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.
Fig. 1 shows a schematic diagram of a multiple output power supply system according to an embodiment of the invention. The power supply system includes a first voltage conversion circuit 11 and a second voltage conversion circuit 12. The first voltage conversion circuit 11 and the second voltage conversion circuit 12 are both non-isolated voltage conversion circuits. The first voltage conversion circuit 11 is configured to provide a first output voltage at a first voltage output terminal OUT 1. The input terminal of the second voltage converting circuit 12 is coupled to the output terminal of the first voltage converting circuit 11, and the second voltage converting circuit 12 is configured to provide a second output voltage at a second voltage output terminal OUT 2. A unidirectional conducting device D1 is further coupled between the output terminal of the first voltage conversion circuit 11 and the first voltage output terminal OUT1, for unidirectional current flow from the output terminal of the first voltage conversion circuit 11 to the first voltage output terminal OUT 1.
The first voltage converting circuit 11 has an input terminal and an output terminal, and the input terminal of the first voltage converting circuit 11 is coupled to the input voltage Vin. Preferably, the first voltage conversion circuit 11 comprises a Buck (Buck) circuit, the Buck circuit comprising a power transistor Q, the Buck circuit for providing a first output voltage at a first voltage output terminal OUT1 for driving a first load based on an on and off state of the power transistor Q. The Buck circuit further includes a rectifier D0 and an inductor L, wherein a first terminal of the power transistor Q is coupled to the input terminal of the first voltage converting circuit 11, a second terminal of the power transistor Q is coupled to the inductor L and the rectifier D0, and a control terminal of the power transistor Q is controlled by a power transistor control signal CT1 for controlling the on and off states of the power transistor Q. The first end of the inductor L is coupled to the power transistor Q and the rectifying transistor D0, and the second end of the inductor is the output end of the first voltage conversion circuit 11. The first voltage conversion circuit may also include other topologies, such as a Buck-boost (Buck-boost) circuit.
The second voltage converting circuit 12 includes a switch K, wherein a first terminal of the switch K is coupled to the output terminal of the first voltage converting circuit 11. In the illustrated embodiment, the first terminal of the switch K is coupled to the second terminal of the inductor L. The second terminal of the switch K is coupled to the second voltage output terminal OUT2, and the control terminal of the switch K receives a switch control signal CT2 for controlling the on and off states of K. Based on the on and off of the switch K, a second output voltage is provided at a second voltage output terminal OUT2 for driving a second load.
The first terminal of the unidirectional device D1 is coupled to the output terminal of the first voltage transformation circuit 11, such as the second terminal of the inductor L, and the second terminal of D1 is coupled to the first voltage output terminal OUT 1. In one embodiment, the unidirectional device D1 includes a diode, wherein the anode of the diode D1 is coupled to the output terminal of the first voltage transformation circuit 11, and the cathode of the diode D1 is coupled to the first voltage output terminal OUT 1.
The power supply system further comprises a first control circuit 110 and a second control circuit 120. The output terminal of the first control circuit 110 is coupled to the control terminal of the power transistor Q, and the output terminal of the first control circuit 110 provides a power transistor control signal CT1 for controlling the power transistor Q. An output terminal of the second control circuit 120 is coupled to a control terminal of the switch K, and an output terminal of the second control circuit 120 provides a switch control signal CT2 for controlling the switch K.
The first voltage conversion circuit 11 may further include an input capacitor, an output capacitor, and/or other circuits and elements. The second voltage converting circuit 12 may also further include an output capacitor and/or other circuits and components.
Through the topology, the power supply system can simultaneously provide the first output voltage and the second output voltage lower than the first output voltage by adopting a simple circuit structure, and meanwhile, the switch K has lower loss and high system efficiency.
Fig. 2 shows a schematic diagram of a power supply system according to an embodiment of the invention. In the illustrated embodiment, the input terminal of the first control circuit 210 is coupled to the first voltage output terminal OUT 1. In one embodiment, the input terminal of the first control circuit 210 is used as the first power terminal, such that the first voltage output terminal OUT1 provides power to the control circuit 210, such as by drawing a power supply voltage from the first voltage output terminal OUT1 through a diode. In another embodiment, the first voltage output terminal OUT1 provides the power supply for the first control circuit 210 at the same time, and the first control circuit 210 generates the power tube control signal CT1 for controlling the power tube Q based on the first output voltage provided by the first voltage output terminal OUT1 to regulate the first output voltage. In one embodiment, the first control circuit 210 provides the control signal CT1 based on a comparison of a first feedback signal indicative of the first output voltage and a first reference signal, and controls the power transistor Q to be turned on when the first feedback signal is lower than the first reference signal and to be turned off when the first feedback signal is higher than the first reference signal. Or in another embodiment, the first control circuit controls the power tube Q based on the error amplification signal of the first feedback signal and the first reference signal.
The second control circuit 220 has an input terminal and an output terminal, wherein the input terminal of the second control circuit 220 is coupled to the second voltage output terminal OUT2 for receiving the second output voltage and obtaining a second feedback signal representing the second output voltage, and the output terminal of the second control circuit 220 is coupled to the control terminal of the switch K. The second control circuit 220 controls the switch K for regulating the second output voltage based on the second output voltage. In one embodiment, the second control circuit 220 controls the switch K based on a comparison of the second feedback signal and the second reference signal, controls the switch K to turn on when the second feedback signal is less than the second reference signal, and controls the switch K to turn off when the second feedback signal is greater than the second reference signal. In another embodiment, the second control circuit 220 controls the switch K based on the error amplification signal of the second feedback signal and the second reference signal.
In one embodiment, the first control circuit 210 is fabricated on a semiconductor substrate and the second control circuit 220 is fabricated on another semiconductor substrate. In one embodiment, the first control circuit 210 and the power transistor Q, or the second control circuit 220 and the switch K are fabricated on the same semiconductor substrate. In another embodiment, the first control circuit 210 and the power transistor Q are fabricated on different semiconductor substrates, respectively, but the first control circuit 210 and the power transistor Q are packaged in the same electronic package, or the second control circuit 220 and the switch K are fabricated on different semiconductor substrates, respectively, but the second control circuit 220 and the switch K are packaged in the same electronic package.
Fig. 3 shows a schematic diagram of a power supply system according to another embodiment of the invention. Wherein the second control circuit 320 has a first input terminal, a second input terminal, a first output terminal and a second output terminal. The first input terminal of the second control circuit 320 is coupled to the second voltage output terminal OUT2 for obtaining a second feedback signal representing the second output voltage, and the second control circuit 320 provides the switch control signal CT2 at the first output terminal of the second control circuit 320 based on the second feedback signal. A second input terminal of the second control circuit 320 is coupled to the first voltage output terminal OUT 1. In one embodiment, the second input terminal of the second control circuit 320 forms a power terminal of the second control circuit 320, and the first output voltage of the first voltage output terminal OUT1 is used to power the second control circuit 320. Preferably, the second input terminal of the second control circuit 320 is further configured to obtain a first feedback signal representing the first output voltage, and the second control circuit 320 generates the communication signal TS based on the first feedback signal and outputs the communication signal TS at the second output terminal of the second control circuit 320. In one embodiment, the second control circuit 320 outputs the communication signal TS based on a comparison of the first feedback signal and the first reference signal, such as when the first feedback signal is less than the first reference signal, the communication signal TS is low, and when the first feedback signal is greater than the first reference signal, the communication signal TS is high. In another embodiment, the second control circuit 320 provides the communication signal TS based on the error amplified signal of the first feedback signal and the first reference signal. The input terminal of the first control circuit 310 receives the communication signal TS output by the second control circuit 320, and the output terminal of the first control circuit 310 generates the power transistor control signal CT1 for controlling the power transistor Q based on the communication signal TS. The first control circuit 310 may have a level conversion circuit for converting the communication signal TS into a level signal suitable for application by the first control circuit 310 and further generating the power tube control signal CT1 based on the converted signal.
In one embodiment, the first control circuit 310 is fabricated on a semiconductor substrate and the second control circuit 320 is fabricated on another semiconductor substrate. In one embodiment, the first control circuit 310 and the power transistor Q, or the second control circuit 320 and the switch K are fabricated on the same semiconductor substrate. In another embodiment, the first control circuit 310 and the power transistor Q are fabricated on different semiconductor substrates, respectively, but the first control circuit 310 and the power transistor Q are packaged in the same electronic package, or the second control circuit 320 and the switch K are fabricated on different semiconductor substrates, respectively, but the second control circuit 320 and the switch K are packaged in the same electronic package.
Fig. 4 shows a schematic circuit diagram of a power supply system according to an embodiment of the invention. The power supply system includes a Buck circuit, a switch K, a first control circuit 410, and a second control circuit 420. The Buck circuit comprises a power tube Q, a rectifying tube D0 and an inductor L, and is configured to provide a first output voltage at a first voltage output terminal OUT1 for driving a second load. The power supply system provides a second output voltage at a second voltage output terminal OUT2 for driving a second load by controlling the switch K. A diode D1 is coupled between the inductor of the Buck circuit and the first voltage output terminal OUT1, and the diode D1 prevents current from flowing from the first voltage output terminal OUT1 to the second voltage output terminal OUT2 when the switch K is turned on. In the illustrated embodiment, the power transistor Q and the switch K respectively include Metal Oxide Semiconductor Field Effect Transistors (MOSFETs), wherein a drain of the MOSFET Q is coupled to the input voltage terminal Vin, a source of the MOSFET Q is coupled to the first terminal of the inductor L, a drain of the MOSFET K is coupled to the second terminal of the inductor L, and a source of the MOSFET K is coupled to the second voltage output terminal OUT2 for providing the second output voltage.
The power supply system further comprises a second unidirectional conducting device D2, a first terminal of which is coupled to the first voltage output terminal OUT1, a second terminal of which is coupled to the power terminal VDD1 of the first control circuit 410, for supplying power to the first control circuit 410 by the first output voltage. In one embodiment, the power supply terminal VDD1 of the first control circuit 410 is further configured to obtain a first feedback signal indicative of the first output voltage, and the first control circuit 410 controls the power transistor Q based on the first feedback signal.
A first terminal of the second control circuit 420 is coupled to the first voltage output terminal OUT1 for receiving the first output voltage to supply power to the control circuit 420; a second terminal of the second control circuit 420 is coupled to the second voltage output terminal OUT2 for receiving the second output voltage; the third terminal of the second control circuit 420 is configured to provide a switch control signal CT2 to control the switch K, wherein the first terminal of the switch is coupled to the first voltage output terminal OUT1 through the first unidirectional conducting device D1, the second terminal of the switch is coupled to the second voltage output terminal OUT2, and the output terminal of the Buck circuit provides a second output voltage through the switching operation of the switch K; the fourth terminal of the second control circuit 420 is for coupling to ground.
The second control circuit 420 includes a switch control circuit 421, and the switch control circuit 421 generates a switch control signal CT2 based on the second output voltage and the second reference signal. The switch control circuit 421 has a first input terminal, a second input terminal, and an output terminal, the first input terminal of the switch control circuit 421 is coupled to the second voltage output terminal OUT2, the second input terminal of the switch control circuit is coupled to the second reference signal Vref2, and the output terminal of the switch control circuit 421 is coupled to the control terminal of the switch K as the first output terminal of the second control circuit 420. In one embodiment, the switch control circuit 421 controls the switch K based on a comparison of a second feedback signal indicative of the second output voltage and a second reference signal Vref 2. The switch K is controlled to be turned on when the second feedback signal is less than the second reference signal Vref2, and to be turned off when the second feedback signal is greater than the second reference signal Vref 2. In another embodiment, the switch control circuit 421 controls the switch K based on the error amplification signal of the second feedback signal and the second reference signal Vref2, and the specific method can be seen in any suitable scheme in the prior art for controlling the switch based on the error amplification signal of the feedback signal and the reference signal, so that the output signal represented by the feedback signal varies with the reference signal.
In the illustrated embodiment, the second control circuit 420 further has a fifth terminal as a second output terminal of the second control circuit providing the communication signal TS. The second control circuit 420 further includes a communication signal generating circuit 422, the communication signal generating circuit 422 having an input and an output, the input of the communication signal generating circuit 422 being coupled to the first voltage output OUT1, the output of the communication signal generating circuit 422 being coupled to the fifth terminal of the second control circuit 420 for providing the communication signal TS. In one embodiment, the communication signal generating circuit 422 provides the control signal CT1 based on a comparison of a first feedback signal indicative of the first output voltage and a first reference signal Vref1, and controls the power transistor Q to be turned on when the first feedback signal is lower than the first reference signal Vref1 and to be turned off when the first feedback signal is higher than the first reference signal. In another embodiment, the communication signal generation circuit 422 generates the communication signal TS based on the error amplified signal of the first feedback signal and the first reference signal Vref 1. The fifth terminal of the second control circuit 420 is coupled to the second input terminal of the first control circuit 410 for receiving the communication signal TS. The first control circuit 410 generates a power transistor control signal CT1 for controlling the state of the power transistor Q based on the communication signal TS, and further controls the first output voltage value of the first voltage output terminal OUT 1.
In another embodiment, the second control circuit 420 may not have a fifth terminal.
In one embodiment, the switch control circuit 421 is coupled to the communication signal generating circuit 422, and the switch control circuit 421 further controls the switch K based on the first output voltage or the communication signal TS, for example, when the first output voltage drops, the duty ratio of the switch K is increased, so as to achieve high dynamic and high precision control of the dual output.
Through the arrangement, the second control circuit 420 realizes communication and control of the second control circuit and the Buck circuit in the second voltage conversion circuit by adding signal transmission pins, and adjusts linkage of the switch K and the power tube Q to form a high-precision high-dynamic two-way output system.
Fig. 5 shows a signal waveform diagram according to an embodiment of the invention. As will be described below with reference to fig. 4, the signals respectively represent, from top to bottom, a first feedback signal Vout1 indicative of the voltage at the first voltage output terminal OUT1, a power tube control signal CT1, a second feedback signal Vout2 indicative of the voltage at the second voltage output terminal OUT2, and a switch control signal CT 2. Wherein the first output voltage of the first voltage output terminal OUT1 is higher than the second output voltage of the second voltage output terminal OUT 2. In one embodiment, the switch K is in a conducting state in the initial state, and the switch control signal CT2 is initially at a high level. At time t1, for example, when the system clock signal rises or under some other triggering condition, the power transistor control signal CT1 changes from low level to high level, the power transistor Q is turned on, the current in the inductor preferentially flows to the second voltage output terminal OUT2 through the switch K, the second output voltage rises, and the second feedback signal Vout2 rises; at time t2, the second output voltage reaches the predetermined threshold, that is, the second feedback signal Vout2 rises to the second reference signal Vref2, the switch control signal CT2 goes low, the switch K is turned off, and the second output voltage falls under the consumption of the second load, at which time the current flows to the first voltage output terminal OUT1, the first output voltage rises, and the first feedback signal Vout1 goes high. At time t3, the first output voltage reaches the predetermined threshold value, that is, the first feedback signal Vout1 rises to the first reference signal Vref1, the communication signal TS output by the second control circuit 420 or the first control circuit 410 controls the power transistor Q to turn off based on the first output voltage, the power transistor control signal CT1 changes from high level to low level, the power transistor Q turns off, and the first output voltage drops. At the same time, the switch control signal CT2 changes from low level to high level, and the switch K is turned on. When the first output voltage or the second output voltage drops to the corresponding low threshold value, or when the next periodic signal arrives, at time t4, the control signal CT1 changes from low level to high level, and the power tube Q is turned on again.
Fig. 6 shows a schematic diagram of a power supply system according to an embodiment of the invention. The power supply system comprises a first electronic package 601 and a second electronic package 602, wherein the first electronic package 601 comprises a power tube and a first control circuit, the second electronic package 602 comprises a switch and a second control circuit, and the power tube, the first control circuit, the switch and the second control circuit can refer to the embodiments and the combination of the embodiments described above in the description part. Wherein the second electronic package 602 has a first pin VDD, a second pin VO, a third pin DRAIN, and a fourth pin GND. The first pin VDD is coupled to the first voltage output terminal OUT1 for receiving the first output voltage; the second pin VO is coupled to a second voltage output terminal OUT2 for receiving a second output voltage; the third pin DRAIN is coupled to an output terminal of the first voltage conversion circuit, i.e., a second terminal of the inductor L, wherein a first terminal of the inductor L is coupled to the first electronic package 601 and the rectifying tube D0, and an output terminal of the first voltage conversion circuit is coupled to the first voltage output terminal OUT1 through the unidirectional conducting device D1. The fourth pin GND is coupled to the system ground reference. The electronic package 602 includes a switch, wherein a first terminal of the switch is coupled to the output terminal of the first voltage transforming circuit, and a second terminal of the switch is coupled to the second voltage output terminal OUT 2.
Fig. 7 shows a schematic diagram of a power supply system including an electronic package according to another embodiment of the invention. The power supply system includes a first electronic package 701 and a second electronic package 702. In comparison with fig. 6, the second electronic package 702 in fig. 7 further has a fifth pin TS, and the first electronic package 701 further has a fourth pin TS 1. Wherein the fifth pin TS is coupled to the fourth pin TS1 of the first electronic package 701. In one embodiment, the second electronic package 702 includes a switch, a switch control circuit and a communication signal generating circuit, wherein an input terminal of the switch control circuit is coupled to the second voltage output terminal OUT2, an output terminal of the switch control circuit is coupled to a control terminal of the switch for controlling the switch to adjust the second output voltage based on a feedback signal of the second output voltage, an input terminal of the communication signal generating circuit is coupled to the first voltage output terminal OUT1, and an output terminal of the communication signal generating circuit is coupled to the fifth terminal TS for providing the communication signal. In one embodiment, the switch control circuit is coupled to the communication signal generation circuit, and the switch control circuit controls the second output voltage of the second voltage output terminal OUT2 based on the first output voltage and the second output voltage.
The description and applications of the invention herein 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 invention.

Claims (16)

1. A multiple output power supply system comprising:
the switching voltage reduction circuit comprises a power tube and an inductor, wherein the first end of the inductor is coupled with the power tube, and the switching voltage reduction circuit is used for providing a first output voltage at a first voltage output end to drive a first load;
a switch, a first end of which is coupled to the second end of the inductor, and a second end of which is coupled to the second voltage output end for providing a second output voltage to drive a second load; and
and the first end of the unidirectional conducting device is coupled with the second end of the inductor, and the second end of the unidirectional conducting device is coupled with the first voltage output end, wherein the unidirectional conducting device is used for enabling current to flow from the first end of the unidirectional conducting device to the second end of the unidirectional conducting device.
2. The power supply system of claim 1, comprising:
the first control circuit generates a power tube control signal to control the power tube; and
the second control circuit is coupled to the second voltage output end and used for obtaining a second feedback signal representing a second output voltage, the second control circuit generates a switch control signal based on the second feedback signal and a second reference signal, and the switch control signal controls the switch to adjust the second output voltage.
3. The power supply system of claim 2 wherein the second control circuit is further coupled to the first voltage output for obtaining a first feedback signal indicative of the first output voltage, the second control circuit generating a communication signal based on the first feedback signal and the first reference signal, the communication signal input to the first control circuit.
4. The power supply system of claim 3, wherein the second control circuit has a second power supply terminal coupled to the first voltage output terminal, the second power supply terminal being for powering the second control circuit and for obtaining the first feedback signal.
5. The power supply system of claim 2 wherein the first control circuit is coupled to the first voltage output for obtaining a first feedback signal indicative of the first output voltage, the first control circuit generating the power tube control signal to adjust the first output voltage based on the first feedback signal and a first reference signal.
6. The power supply system of claim 5, wherein the first control circuit has a first power supply terminal coupled to the first voltage output terminal through the second unidirectional conducting device, the first power supply terminal being configured to power the first control circuit and to obtain the first feedback signal.
7. The power supply system of claim 2, wherein the second control circuit has a second power supply terminal coupled to the first voltage output terminal, the second power supply terminal for powering the second control circuit.
8. A multiple output power supply system comprising:
the first voltage conversion circuit converts an input voltage into a first output voltage and provides the first output voltage at a first voltage output end for driving a first load, wherein the first voltage conversion circuit is a non-isolated voltage conversion circuit;
a second voltage conversion circuit comprising a switch, wherein a first terminal of the switch is coupled to the output terminal of the first voltage conversion circuit, and a second terminal of the switch provides a second output voltage at a second voltage output terminal for driving a second load; and
and the first end of the unidirectional conducting device is coupled with the output end of the first voltage conversion circuit, and the second end of the unidirectional conducting device is coupled with the first voltage output end, wherein the unidirectional conducting device is used for enabling current to flow from the first end of the unidirectional conducting device to the second end of the unidirectional conducting device.
9. The power supply system of claim 8 wherein the second voltage translation circuit includes a second control circuit, a first terminal of the second control circuit coupled to the first voltage output for powering the second control circuit and providing a communication signal at a second output of the second control circuit based on the first output voltage; the second control circuit has a second terminal coupled to the second voltage output terminal, and the second control circuit provides a switch control signal at a first output terminal of the second control circuit for controlling the switch based on the second output voltage.
10. A control circuit for a multiple output power supply system, having:
a first terminal for coupling to a first voltage output terminal to receive a first output voltage to supply power to the control circuit;
a second terminal for coupling to a second voltage output terminal to receive a second output voltage;
a third terminal for providing a switch control signal to control the switch, wherein the first terminal of the switch is coupled to the first voltage output terminal through the one-way conduction device, and the second terminal of the switch is coupled to the second voltage output terminal; and
and the fourth end is used for coupling the reference ground.
11. The control circuit of claim 10, wherein the control circuit comprises a switch control circuit that generates the switch control signal based on the second output voltage and a second reference signal.
12. The control circuit of claim 10, further having a fifth terminal for providing a communication signal, wherein the control circuit further comprises a communication signal generation circuit that generates the communication signal based on the first output voltage and the first reference signal.
13. An electronic package for a multiple output power supply system comprising a switch and control circuit as claimed in any one of claims 10 to 12.
14. An electronic package for a multiple output power supply system, comprising:
the first pin is coupled with the first voltage output end to receive a first output voltage;
the second pin is coupled with the second voltage output end to receive a second output voltage;
the third pin is used for being coupled with the output end of the first voltage conversion circuit, wherein the output end of the first voltage conversion circuit is coupled with the first voltage output end through a one-way conduction device; and
and the fourth pin is used for coupling the reference ground.
15. The electronic package of claim 14, comprising a switch and a switch control circuit, wherein a first terminal of the switch is coupled to the first pin, a second terminal of the switch is coupled to the second pin, and a control terminal of the switch is coupled to the switch control circuit.
16. The electronic package of claim 14, further comprising a fifth pin for coupling to an input of another control circuit, wherein the another control circuit is used to control the power transistor of the first voltage converting circuit.
CN202010709091.1A 2020-07-22 2020-07-22 Multi-output power supply system, control circuit thereof and electronic packaging body Pending CN111769741A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112366952A (en) * 2020-11-13 2021-02-12 深圳市必易微电子股份有限公司 Isolated voltage conversion circuit, control circuit thereof and power supply method
CN112366952B (en) * 2020-11-13 2024-05-31 深圳市必易微电子股份有限公司 Isolated voltage conversion circuit, control circuit thereof and power supply method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112366952A (en) * 2020-11-13 2021-02-12 深圳市必易微电子股份有限公司 Isolated voltage conversion circuit, control circuit thereof and power supply method
CN112366952B (en) * 2020-11-13 2024-05-31 深圳市必易微电子股份有限公司 Isolated voltage conversion circuit, control circuit thereof and power supply method

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