Power supply circuit, power supply circuit generation method, and power supply circuit control method

Patent metadata

Field	Value
Publication number	US-10429873-B2
Application number	US-201815980107-A
Country	US
Kind code	B2
Filing date	May 15, 2018
Priority date	Jun 29, 2017
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

The present disclosure relates to the field of intelligent wearable technologies, and provides a power supply circuit, a power supply circuit generation method, and a power supply circuit control method. The present disclosure provides a power supply circuit, including: a bandgap voltage reference Bandgap, a real-time detection and control module, and an alternate voltage source module, where the real-time detection and control module adjusts an output point voltage of the alternate voltage source module according to an output voltage of the Bandgap; and when the output point voltage of the alternate voltage source module reaches a target voltage, the real-time detection and control module closes the Bandgap and supplies power by using the alternate voltage source module. In such a power supply circuit, after adjustment of an output point voltage of an alternate voltage source module is completed, a Bandgap does not need to keep a power-supply state, and therefore power consumed by the Bandgap is reduced based on stable voltage supply.

First claim

What is claimed is:

1. A power supply circuit, comprising:
a bandgap voltage reference Bandgap;
a real-time detection and control module; and
an alternate voltage source module;
wherein the real-time detection and control module is connected to the Bandgap and the alternate voltage source module, and the real-time detection and control module is configured to adjust an output point voltage of the alternate voltage source module according to an output voltage of the Bandgap; and
wherein when the output point voltage of the alternate voltage source module reaches a target voltage, the real-time detection and control module is configured to make the Bandgap enter a non-power supply state, and to supply power using the alternate voltage source module.

2. The power supply circuit according to claim 1 , wherein at least one of:
the alternate voltage source module has multiple output point voltages, wherein the multiple output point voltages may be configured to be the same voltage or different voltages; or
the power supply circuit comprises multiple alternate voltage source modules, wherein the output point voltages of the multiple alternate voltage source modules may be configured to be the same voltage or different voltages.

3. The power supply circuit according to claim 1 , wherein the real-time detection and control module comprises:
a detection and control unit, and
a standard cell;
wherein the detection and control unit is connected to the Bandgap and the standard cell, and the detection and control unit is configured to adjust a bleeder circuit of the standard cell according to the output voltage of the Bandgap so that a voltage of a marking point of the standard cell is equal to the output voltage of the Bandgap; and
wherein the real-time detection unit is configured to adjust a bleeder circuit of the alternate voltage source module according to the bleeder circuit of the standard cell so that the output point voltage of the alternate voltage source module reaches the target voltage.

4. The power supply circuit according to claim 1 , wherein when a power-supply duration of the alternate voltage source module reaches a preset duration, the real-time detection and control module is configured to re-adjust the output point voltage of the alternate voltage source module according to the output voltage of the Bandgap so that the output point voltage of the alternate voltage source module reaches the target voltage.

5. The power supply circuit according to claim 1 , wherein:
the alternate voltage source module comprises:
a PMOS transistor;
an NMOS transistor;
a first resistor;
a second resistor; and
a capacitor;

a source and a drain of the PMOS transistor are respectively connected to an input high level and a first end of the first resistor;
a source and a drain of the NMOS transistor are respectively connected to the ground and a second end of the second resistor;
a second end of the first resistor is connected to a first end of the second resistor, wherein at least one of the first resistor or the second resistor is an adjustable resistor, and a control end of the adjustable resistor is connected to a resistance control end of the real-time detection and control module;
the capacitor is connected to the ground and the first end of the second resistor; and
an output point of the alternate voltage source module is located in the second resistor, and a ratio of a resistance value between the output point and the ground to that of the second resistor is equal to a ratio of the target voltage to the output voltage of the Bandgap.

6. The power supply circuit according to claim 3 , wherein:
the standard cell comprises:
a PMOS transistor;
an NMOS transistor;
a first resistor of the standard cell; and
a second resistor of the standard cell;

a source and a drain of the PMOS transistor are respectively connected to an input high level and a first end of the first resistor of the standard cell;
a source and a drain of the NMOS transistor are respectively connected to the ground and a second end of the second resistor of the standard cell;
the first resistor of the standard cell is an adjustable resistor, and a control end of the first resistor of the standard cell is connected to a resistance control end of the detection and control unit; and
the detection and control unit controls and adjusts a resistance value of the first resistor of the standard cell, so that an output voltage of a second end of the first resistor of the standard cell and/or a first end of the second resistor of the standard cell is the same as the output voltage of the Bandgap.

7. The power supply circuit according to claim 6 , wherein:
the alternate voltage source module comprises:
a PMOS transistor;
an NMOS transistor;
a first resistor of the alternate voltage source module;
a second resistor of the alternate voltage source module; and
a capacitor;

a source and a drain of the PMOS transistor are respectively connected to an input high level and a first end of the first resistor of the alternate voltage source module;
a source and a drain of the NMOS transistor are respectively connected to the ground and a second end of the second resistor of the alternate voltage source module;
a second end of the first resistor of the alternate voltage source module is connected to a first end of the second resistor of the alternate voltage source module;
the capacitor is connected to the ground and an output point of the alternate voltage source module, wherein the output point is located in the second resistor of the alternate voltage source module, and a ratio of a resistance value between the output point and the ground to that of the second resistor of the standard cell is equal to a ratio of the target voltage to the output voltage of the Bandgap;
a resistance value of the second resistor of the alternate voltage source module is equal to that of the second resistor of the standard cell; and
the first resistor of the alternate voltage source module is an adjustable resistor that connects a control end to the resistance control end of the detection and control unit, and the detection and control unit is configured to adjust a resistance value of the first resistor of the alternate voltage source module to be the same as that of the first resistor of the standard cell.

8. The power supply circuit according to claim 7 , wherein:
a second resistor R 2 of the alternate voltage source module is formed by multiple resistors R 2 , R 22 , . . . , R 2n that are in serial connection, wherein n is a positive integer not less than 2;
a first end of R 21 is connected to the second end of the first resistor of the alternate voltage source module, and a second end of R 21 is connected to a first end of R 22 ;
a first end of R 2k is connected to a second end of R 2(k−1) , and a second end of R 2k is connected to a first end of R 2(k+1) , wherein k is a positive integer and 1<k<n;
a first end of R 2n is connected to a second end of R 2(n−1) , and a second end of R 2n is connected to the drain of the NMOS; and
a first end of R 2j is connected to the capacitor of which another end is grounded, wherein j is a positive integer and 1≤j≤n, and
ratios of R 2j +R 2(j+1) + . . . R 2n to the second resistor of the standard cell are respectively equal to a ratio of a single target voltage to the output voltage of the Bandgap.

9. The power supply circuit according to claim 6 , wherein to adjust the bleeder circuit of the standard cell according to the output voltage of the Bandgap, so that a voltage of a marking point of the standard cell is equal to the output voltage of the Bandgap, the detection and control unit is configured to

Assignees

• Semiconductor Mfg Int Shanghai Corp
• Semiconductor Mfg Int Beijing Corp
• Semiconductor Manf Intl Shanghai Corp
• Semiconductor Manf Intl Beijing Corp

Inventors

• Wang Teng Ye
• Yang Chia Chi
• Deng Zhi Bing
• Zhang Xian Lei

Classifications

• G05F3/16 Primary

  being semiconductor devices · CPC title

• G05F1/56 Primary

  using semiconductor devices in series with the load as final control devices (G05F1/461 takes precedence) · CPC title

• H02M2001/0045

  Electricity · mapped topic

• H02M1/0045

  Converters combining the concepts of switch-mode regulation and linear regulation, e.g. linear pre-regulator to switching converter, linear and switching converter in parallel, same converter or same transistor operating either in linear or switching mode · CPC title