CN112526897A - Control device and control method for power supply time sequence - Google Patents
Control device and control method for power supply time sequence Download PDFInfo
- Publication number
- CN112526897A CN112526897A CN202011479000.6A CN202011479000A CN112526897A CN 112526897 A CN112526897 A CN 112526897A CN 202011479000 A CN202011479000 A CN 202011479000A CN 112526897 A CN112526897 A CN 112526897A
- Authority
- CN
- China
- Prior art keywords
- power supply
- time sequence
- reference voltage
- input
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a control device of power supply time sequence, comprising: the circuit comprises a reference voltage circuit module, a time sequence generating circuit module and a switch control circuit module. The invention also discloses a control method of the power supply time sequence. A simple secondary power supply time sequence control circuit is built through discrete elements such as a simple comparator, a reference voltage chip and an MOS (metal oxide semiconductor) tube, the power-on and power-off sequence of a secondary power supply can be controlled, the time sequence control of the power supply is effectively carried out, the cost is low, and the design is simple.
Description
Technical Field
The invention relates to the sequential control of a plurality of paths of power supplies on a control panel of electronic equipment, belonging to the field of sequential control of power supplies.
Background
The design requirements of power supplies in control boards of electronic equipment are more and more complex, and strict power-on or power-off time sequences of multiple power supplies are often required. In order to realize this function, a general design method is to use a special power supply timing control chip or a programmable logic device to realize the function. Meanwhile, in order to ensure that the special power timing control chips work, the single board needs to additionally provide a standby power (standby power) required by the special power timing control chips. The power supply time sequence control method is complex in design and high in cost.
In order to solve the problem, a control circuit which is composed of discrete devices such as a comparator, an MOS tube, a thermistor, a reference voltage chip and the like is provided, and the control circuit can effectively control the power-on time sequence and the power-off time sequence of a time sequence single board. The design method is simple and easy to realize, and the cost is low.
Disclosure of Invention
In order to solve the problems and reduce the design cost of products, the invention provides a novel power supply time sequence control method, a simple secondary power supply time sequence control circuit is built through discrete elements such as a simple comparator, a reference voltage chip, an MOS (metal oxide semiconductor) transistor and the like, the power-on and power-off sequence of a secondary power supply can be controlled, the time sequence control of the power supply is effectively carried out, the cost is low, and the design is simple.
The scheme of the invention is as follows: a control apparatus of a power supply timing, comprising:
the reference voltage circuit module generates a stable reference voltage which is sent to a comparator of the time sequence generation module to be used as a reference input;
the time sequence generating circuit module generates a power supply time sequence signal and sends the power supply time sequence signal to the switch control circuit module to generate power-on or power-off power supply time sequences of all levels;
and the switch control circuit module realizes the opening or closing function of the secondary power supply and simultaneously realizes the quick discharge of the current of the secondary power supply.
A method for controlling power supply time sequence comprises the following steps:
firstly, a reference voltage circuit generates a constant and stable reference voltage to a time sequence generating circuit;
a comparison device in the time sequence generating circuit receives the reference voltage generated by the reference voltage circuit as a reference voltage; when the second input of the comparator is higher than the reference voltage, an enable signal with high level is generated; when the second input of the comparator is lower than the reference voltage, an enable signal with low level is generated;
thirdly, the time sequence generating circuit sends the enabling signal generated by the comparator to the control switch circuit, and the circuit sequentially turns on the output enabling of the secondary power supply according to the enabling signal generated by the time sequence circuit to generate a single-board time sequence; simultaneously turning off the enabling of the bleeder circuit;
when the power is off, the input power supply slowly powers off, and different voltage dividing resistors are not arranged, so that the input value lower than the reference voltage of the comparator at different moments is realized, and different enable signals for realizing the circuit closing are generated;
the time sequence generating circuit sends the generated secondary power supply closing signal to the control switch circuit module; and the control switch circuit module turns off the input enable of the secondary power supply in sequence according to the signals, so that the required power-down time sequence is generated.
Furthermore, in the second step, the input power supply generates an input through a voltage dividing resistor and sends the input to the comparator, and the input is used as a second path of input to be compared with the voltage generated by the reference voltage; the input power supply realizes that the voltage input by the second path of the comparator is higher than the reference voltage at different moments by setting different divider resistors, so that different time sequence opening signals are generated, and the time sequence required by the time sequence of the secondary power supply is realized.
In order to ensure the reliability of the power-off sequence, the control switch circuit simultaneously opens the bleeder circuit when the power supply is powered off, so as to ensure that the power supply is powered off quickly
In the scheme of the invention, a power supply time sequence control circuit is built by adopting discrete components such as a reference voltage chip, a comparator, a thermistor, an MOS (metal oxide semiconductor) switching tube and the like. The sequential control circuit can effectively realize the control of the power-on sequential and the power-off sequential of the power supply. Through the scheme of the invention, compared with the implementation scheme of adopting a time sequence control chip and the like, the cost can be effectively saved, thereby improving the market competitiveness of the designed product.
Drawings
Fig. 1 is a system block diagram of a timing control circuit according to an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Fig. 1 shows a system block diagram of the present invention, which mainly includes a reference voltage circuit module 100, a timing generation circuit module 200, and a switch control circuit module 300.
The main function of the 100 reference voltage circuit block is to generate a stable reference voltage. This reference voltage is fed to the comparator of the timing generation module as a reference input.
The 200 timing generation circuit module generates the power timing signal described in the present invention in the main functional chamber. The timing signal is sent to 300 switch control circuit modules to generate power-on or power-off power supply timing of each stage. The 200 time sequence generation circuit module mainly realizes generation of each enable signal of the power supply time sequence through a plurality of comparators. The comparator for realizing the circuit generating module has two inputs, one is a stable reference voltage sent by the reference voltage circuit, and the other is an input value divided by the input power supply through the divider resistor. In the process of rising or falling of the input power supply, different time sequences reaching the reference voltage are generated through different voltage dividing resistors, and corresponding opening or closing signals are generated according to the time sequences and sent to the control switch circuit module.
The 300-switch control module mainly functions to realize the opening or closing function of the secondary power supply and simultaneously realize the quick discharge of the current of the secondary power supply. The 300-switch control module mainly comprises a switch MOS (metal oxide semiconductor) tube, a thermosensitive load resistor and the like.
When the power is on, the 200 time sequence generation circuit module sends different time sequence control starting signals to the 300 control switch circuit module. The 300 control switch circuit module enables each secondary power supply in sequence according to the enabling signal, so that each secondary power supply output is generated, and meanwhile, the enabling of the discharging load thermistor is closed; when the power is off, the 200 time sequence generating circuit module sends out different time sequence control closing signals to the 300 control switch circuit module, the 300 control switch circuit module closes each secondary power supply in sequence according to the enabling signal, and simultaneously opens the switch of the bleeder load circuit, so that the secondary power supply is quickly powered off, and the reliability of the power-off time sequence is ensured.
The technical scheme of the invention mainly comprises a reference voltage circuit, a comparator circuit, a switch control circuit and the like, and the power supply time sequence control described by the invention mainly comprises the following steps.
The input power of the single board is powered on, and this process is described by taking a dc 12v input power as the power on the single board. Because the input requirement of the secondary power supply on the single board is generally 8-12V, the devices used by the timing control method, such as the comparator, and the reference voltage chip can stably work below 5V, that is to say, before the secondary power supply works, the control timing circuit can reliably and stably operate. The present invention saves standby power (standby power) required by other timing control circuits described above by this approach. When the reference voltage circuit of the time sequence control circuit works stably, a reference voltage is output and sent to the comparator to be used as an input reference.
The comparator has two inputs, one is a reference voltage sent by a reference voltage circuit, and the voltage value is constant. The second input is divided by a resistor according to the input power (12 v) of the single board. When the input power supply of the single board rises slowly, the reference value of the reference voltage is raised slowly through the resistor voltage division, and the comparator outputs a time sequence control signal at the moment.
The invention realizes different time reaching the reference voltage by setting different resistors, thereby obtaining output control signals at different moments. For example, the on time set by the comparator 1 is T1, the on time of the comparator 2 is T2, when 12V rises to T1, the voltage value sent by the voltage dividing resistor already meets the reference value of the reference voltage, and at this time, the enable signal turned on by the comparator turns on the following switch control circuit to enable the enable switch of the secondary power supply, thereby outputting the first power supply VCC 1. When 12V rises to T2 moment, the comparator 2 inputs a reference value meeting the reference voltage, the comparator starts an enabling signal, a following switch control circuit is opened, the output of the second power supply VCC2 is enabled, and each power-on sequence is controlled in sequence, so that the power-on sequence of each secondary power supply is realized.
When the single board starts to power down, the input power supply 12V of the single board starts to power down slowly, and due to the difference of the voltage dividing resistors, the input of the comparator 2 will take precedence over the comparator to reach the reference voltage value, so that the comparator 2 will turn off the output enable signal earlier than the comparator 1. The enable signal of the secondary power supply VCC2 is turned off by the following control switch circuit, so that the power supply output of the VCC2 is turned off, and the function of powering down preferentially over the VCC1 is achieved, thereby realizing the control of the power down sequence.
In order to ensure the reliability of the power-off sequence, power-off time sequence protection is added in the invention. The invention controls the power-off sequence by turning off the enable signal of the secondary power supply in the control circuit, and simultaneously turns on the switch of the load discharging circuit. The load discharging circuit is realized by a thermistor, and when the load circuit is opened, the resistance value of the thermistor is very small, so that a large amount of load current passes through, and the power supply is quickly powered off. However, after the current is increased, the resistance value of the thermistor is increased, so that the leakage current of the secondary power supply is limited, and the protection of the single-board circuit is realized. Through the ingenious design, the circuit load current can be discharged quickly, and the circuit of the single board can be protected. When the single board is normally used, the discharge channel is closed, so that the energy-saving design of the power consumption of the single board power supply is realized.
Although particular embodiments of the invention have been described and illustrated in detail, it should be understood that various equivalent changes and modifications could be made to the above-described embodiments in accordance with the spirit of the invention, and the resulting functional effects would still fall within the scope of the invention.
Claims (4)
1. A control apparatus for power timing, comprising:
the reference voltage circuit module generates a stable reference voltage which is sent to a comparator of the time sequence generation module to be used as a reference input;
the time sequence generating circuit module generates a power supply time sequence signal and sends the power supply time sequence signal to the switch control circuit module to generate power-on or power-off power supply time sequences of all levels;
and the switch control circuit module realizes the opening or closing function of the secondary power supply and simultaneously realizes the quick discharge of the current of the secondary power supply.
2. A method for controlling power supply time sequence is characterized in that the method comprises the following steps:
firstly, a reference voltage circuit generates a constant and stable reference voltage to a time sequence generating circuit;
a comparison device in the time sequence generating circuit receives the reference voltage generated by the reference voltage circuit as a reference voltage; when the second input of the comparator is higher than the reference voltage, an enable signal with high level is generated; when the second input of the comparator is lower than the reference voltage, an enable signal with low level is generated;
thirdly, the time sequence generating circuit sends the enabling signal generated by the comparator to the control switch circuit, and the circuit sequentially turns on the output enabling of the secondary power supply according to the enabling signal generated by the time sequence circuit to generate a single-board time sequence; simultaneously turning off the enabling of the bleeder circuit;
when the power is off, the input power supply slowly powers off, and different voltage dividing resistors are not arranged, so that the input value lower than the reference voltage of the comparator at different moments is realized, and different enable signals for realizing the circuit closing are generated;
the time sequence generating circuit sends the generated secondary power supply closing signal to the control switch circuit module; and the control switch circuit module turns off the input enable of the secondary power supply in sequence according to the signals, so that the required power-down time sequence is generated.
3. The method of claim 2,
in the second step, the input power supply generates an input through a divider resistor and sends the input to a comparator, and the input is used as a second path of input to be compared with the voltage generated by the reference voltage; the input power supply realizes that the voltage input by the second path of the comparator is higher than the reference voltage at different moments by setting different divider resistors, so that different time sequence opening signals are generated, and the time sequence required by the time sequence of the secondary power supply is realized.
4. The method of claim 2,
in order to ensure the reliability of the power-off sequence, the control switch circuit simultaneously opens the bleeder circuit when the power supply is powered off, so as to ensure that the power supply is powered off quickly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011479000.6A CN112526897A (en) | 2020-12-15 | 2020-12-15 | Control device and control method for power supply time sequence |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011479000.6A CN112526897A (en) | 2020-12-15 | 2020-12-15 | Control device and control method for power supply time sequence |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112526897A true CN112526897A (en) | 2021-03-19 |
Family
ID=75000216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011479000.6A Pending CN112526897A (en) | 2020-12-15 | 2020-12-15 | Control device and control method for power supply time sequence |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112526897A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116700106A (en) * | 2023-06-30 | 2023-09-05 | 合肥申威睿思信息科技有限公司 | Power-on and power-off time sequence control circuit and method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2657290Y (en) * | 2003-08-19 | 2004-11-17 | 华为技术有限公司 | Power supply sequential control circuit |
| US20130076318A1 (en) * | 2011-09-28 | 2013-03-28 | Hon Hai Precision Industry Co., Ltd. | Power supply control system and method |
| CN211086970U (en) * | 2019-12-31 | 2020-07-24 | 南京埃斯顿自动化股份有限公司 | Multi-power-supply up-down control circuit |
| CN111505993A (en) * | 2020-05-06 | 2020-08-07 | 上海联影医疗科技有限公司 | Sequential control circuit |
| CN111538267A (en) * | 2020-04-24 | 2020-08-14 | 中国电子科技集团公司第四十三研究所 | Power-on and power-off time sequence control circuit and control method for multi-path power supply |
| CN111884498A (en) * | 2020-08-28 | 2020-11-03 | 上海中兴易联通讯股份有限公司 | Power-down time sequence control circuit and method for multi-channel power supply of indoor distribution system |
-
2020
- 2020-12-15 CN CN202011479000.6A patent/CN112526897A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2657290Y (en) * | 2003-08-19 | 2004-11-17 | 华为技术有限公司 | Power supply sequential control circuit |
| US20130076318A1 (en) * | 2011-09-28 | 2013-03-28 | Hon Hai Precision Industry Co., Ltd. | Power supply control system and method |
| CN211086970U (en) * | 2019-12-31 | 2020-07-24 | 南京埃斯顿自动化股份有限公司 | Multi-power-supply up-down control circuit |
| CN111538267A (en) * | 2020-04-24 | 2020-08-14 | 中国电子科技集团公司第四十三研究所 | Power-on and power-off time sequence control circuit and control method for multi-path power supply |
| CN111505993A (en) * | 2020-05-06 | 2020-08-07 | 上海联影医疗科技有限公司 | Sequential control circuit |
| CN111884498A (en) * | 2020-08-28 | 2020-11-03 | 上海中兴易联通讯股份有限公司 | Power-down time sequence control circuit and method for multi-channel power supply of indoor distribution system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116700106A (en) * | 2023-06-30 | 2023-09-05 | 合肥申威睿思信息科技有限公司 | Power-on and power-off time sequence control circuit and method |
| CN116700106B (en) * | 2023-06-30 | 2024-04-19 | 合肥申威睿思信息科技有限公司 | Power-on and power-off time sequence control circuit and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211086970U (en) | Multi-power-supply up-down control circuit | |
| US9059684B2 (en) | Gate control circuit | |
| US7750504B2 (en) | Power supply apparatus to selectively output one of a plurality of input powers | |
| JP5391973B2 (en) | Semiconductor device and power control method for semiconductor device | |
| KR20090084863A (en) | System and method for detection of multiple current limits | |
| US9423810B2 (en) | Voltage regulator and control method thereof | |
| US20100259106A1 (en) | Switching control method capable of continuously providing power and related apparatus and power supply system | |
| US8766679B1 (en) | Power on reset (POR) circuit | |
| US8159199B2 (en) | On-chip voltage supply scheme with automatic transition into low-power mode of MSP430 | |
| US8975776B2 (en) | Fast start-up voltage regulator | |
| KR20060054051A (en) | Inrush current slew control circuit and method | |
| CN112526897A (en) | Control device and control method for power supply time sequence | |
| US10468983B2 (en) | Slew-rate controlled supply voltage switching | |
| US10187055B2 (en) | Output discharge techniques for load switches | |
| CN111884498B (en) | Power-down time sequence control circuit and method for multi-channel power supply of indoor distribution system | |
| US20170288660A1 (en) | Ultra-Low Quiescent Current Multi-Function Switching Circuit and Method for Connecting a Voltage Source to an Output Load with Deep Sleep Capability | |
| US8416013B1 (en) | Core circuit leakage control | |
| US20100244911A1 (en) | Supply circuitry for sleep mode | |
| CN113741252A (en) | Power-off time sequence control circuit of multi-power-supply system | |
| US6828830B2 (en) | Low power, area-efficient circuit to provide clock synchronization | |
| KR102602246B1 (en) | Comparator circuit and switch control device including the same | |
| CN111338460A (en) | Electronic device and power supply method | |
| CN213585203U (en) | Single board and communication device | |
| CN219916685U (en) | Power supply time sequence control circuit and display device | |
| US20130346773A1 (en) | Energy-saving circuit for motherboard |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210319 |
|
| WD01 | Invention patent application deemed withdrawn after publication |