CN101145739B - Control method of self-start circuit and its circuit - Google Patents
Control method of self-start circuit and its circuit Download PDFInfo
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- CN101145739B CN101145739B CN 200710075671 CN200710075671A CN101145739B CN 101145739 B CN101145739 B CN 101145739B CN 200710075671 CN200710075671 CN 200710075671 CN 200710075671 A CN200710075671 A CN 200710075671A CN 101145739 B CN101145739 B CN 101145739B
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Abstract
The invention relates to a controlling method of a self-starting circuit and a circuit thereof. The circuit comprises a sampling control module, a self-starting signal generation module, and a self-starting signal supplying module, wherein the self-starting signal supplying module is respectively connected with the sampling control module, the self-starting signal generation module and the main circuit, the sampling control module receives an input signal and outputs the signal to the self-starting signal supplying module, the self-starting signal generation module outputs the self-starting signal to the self-starting signal supplying module, and the self-starting signal supplying module respectively outputs feedback signal to the sampling control module and the self-starting signal generation module and the standby/starting signal to the main circuit.
Description
Technical field
The present invention relates to the self-start circuit technology, mainly be meant a kind of control method and circuit thereof that is used for the self-start circuit of supply convertor.
Background technology
Power supply is as the power place of various electron electric power equipment, and it is partly crucial to be absolutely necessary.Energy shortage in the global range has at present become various countries' cardinal task, so national governments all make clear and definite requirement to the efficient of AC/DC power supply.Switching Power Supply has efficient, energy-conservation characteristics, has replaced traditional linear stabilized power supply substantially in the AC/DC field of power supplies at present.
Switching Power Supply needs the self-starting element usually, is used to judge the operating state of chip: operate as normal, short circuit work, overvoltage work etc.
By the start-up circuit that comparator is formed, comparator has quiescent current, makes starting current very big, and the stand-by power consumption of system is excessive.
By the start-up circuit that the metal-oxide-semiconductor dividing potential drop constitutes, start with the voltage of closing narrowly, the startup of system is very difficult.
Summary of the invention
The control method and the circuit thereof that the purpose of this invention is to provide a kind of self-start circuit, it not only has startup main circuit such as the switching power circuit that self-start circuit guarantees safety, even main circuit is cisco unity malfunction for a certain reason, stop its operation after perhaps main circuit starts, also self-starting main circuit again.
Realize that method of the present invention is: provide realization by controlling of sampling, self-starting generation control and enabling signal, wherein controlling of sampling is partly accepted input signal, judge the intensity of its signal, whether decision control sample circuit will accept input signal, be self-start circuit holding state or operating state, when being in holding state, the output signal of controlling of sampling part is a low level, do not change with input signal, when being in operating state, the intensity of controlling of sampling part output signal with intensity be directly proportional;
Self-starting signal generator branch is used for when holding state, when the voltage of the voltage monitoring of main circuit joint changes to exceptional value, the self-starting signal is offered the startup node of main circuit;
Enabling signal provides part, provides the standby signal of control main circuit operating state, when standby signal is standby level, main circuit is in the holding state shut-down operation, when standby signal when standby level is converted into triggering level, main circuit is in running order, carries out its operation.
This method also comprises:
Enabling signal provides the signal of part to send to the Control Node of main circuit, so that control the operating state of main circuit.
Realize that circuit of the present invention is: sort circuit comprises that controlling of sampling module, self-starting signal generator module and enabling signal provide module; Wherein enabling signal provides module to connect controlling of sampling module, self-starting signal generator module and main circuit respectively, wherein the controlling of sampling module is accepted input signal and is provided module output signal to enabling signal, the self-starting signal generator module provides module output self-starting signal to enabling signal, enabling signal provide module respectively to controlling of sampling module and self-starting signal generator module output feedback signal, to main circuit output standby/enabling signal.
This circuit also comprises:
Described enabling signal provides module to connect the Control Node of main circuit.
Described circuit comprises NPN pipe and NMOS pipe, Schmidt's reverser (I27), reverser (I28), wherein (base stage in the series connection of Q20-Q23) connects emitter successively for NPN pipe, between Q20 and Q21, connect NMOS pipe (M26) grid through (M24) drain electrode of NMOS pipe, resistance R 20, I27, I28, the M26 drain electrode is connected across between resistance R 21 and the R22, R21 meets Q23, cross-over connection M24 grid between Q21 and Q22.
Described circuit comprises two NPN pipes that oppositely connect, and (Q20-Q21), this NPN pipe is operated in the reverse breakdown district.
Described circuit comprises regenerative circuit, and this circuit is managed Q21, NMOS pipe M24, resistance R 20 and PMOS pipe M25 by NPN and formed.
Described circuit comprises regenerative circuit, and this circuit is made up of NMOS pipe M24 and M26, resistance R 21 and R22, Schmidt's reverser (I27), reverser (I28).
The beneficial effect that the present invention has: the starting current of this programme is very little, and system works very stable under short-circuit condition, and its stand-by power consumption is very little simultaneously.The voltage that starts and close is wide, and the startup of system is easy to.Have characteristics such as circuit is simple, components and parts are few, cost is low.
Description of drawings
Fig. 1 is a block diagram of the present invention.
Fig. 2 is the circuit theory diagrams of Fig. 1.
Fig. 3 is the node oscillogram that the input signal n20 voltage of Fig. 2 rises.
Fig. 4 is the node oscillogram that the input signal n20 voltage of Fig. 2 descends.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing:
The invention provides a kind of self-start circuit and control method that is used for main circuit, it is connected to the Control Node of main circuit, controls the operating state of circuit.This circuit comprises the controlling of sampling module, and self-starting signal generator module and enabling signal provide module.
The controlling of sampling module is accepted input signal, judges the intensity of its signal, and whether decision control sample circuit will accept input signal, i.e. self-start circuit holding state or operating state.When being in holding state, the output signal of controlling of sampling module is a low level, does not change with input signal; When being in operating state, the intensity of controlling of sampling module output signal is directly proportional with the intensity of input signal.
The self-starting signal generator module is used for when holding state, when the voltage of the voltage monitoring of main circuit joint changes to exceptional value, the self-starting signal is offered the startup node of main circuit.
Enabling signal provides module, and the standby signal of control main circuit operating state is provided.When standby signal was standby level, main circuit was in the holding state shut-down operation.When standby signal when standby level is converted into triggering level, main circuit is in running order, carries out its operation.
See Fig. 1, this self-start circuit provides module 13 to form by controlling of sampling module 11, self-starting signal generator module 12, enabling signal.Its output signal standby signal is connected to main circuit 14.
Controlling of sampling module 11 is accepted input signal, when the intensity rising of input signal reaches certain value, the output signal 102 of controlling of sampling module can make enabling signal provide module 13 work, be that enabling signal provides the output signal 105 of module 13 to be standby signal, this standby signal is converted into triggering level from standby level, makes main circuit 14 become the beginning mode of operation by the shut-down operation state.Enabling signal provides the feedback signal 101 of parts 13 and signal 102 can form positive feedback simultaneously, makes the operation of whole start-up circuit more stable.This circuit is realized by the NPN pipe that is operated in the breakdown region.
If when standby signal 105 was triggering level, the mode of operation of main circuit 14 had unusual condition.In this case, self-starting signal generator module 12 provides self-starting signal 103, and self-starting signal 103 provides module 13 to send standby signal 105 to main circuit by enabling signal.Enabling signal provides the feedback signal 104 of module 13 and self-starting signal 103 can form positive feedback simultaneously, makes the operation of whole start-up circuit more stable.
See Fig. 2, wherein n20 is an input signal, and n24 is a standby signal.
In the process that input signal n20 voltage rises, the NPN that oppositely connects when Q20 and Q21 pipe is operated in recoverable breakdown region.When node n20 voltage is managed the reverse breakdown voltage of Q20 and Q21 less than NPN, node n21 shorted to earth is a low level, NMOS pipe M24 turn-offs, resistance R 20 is drawn high node n22 and is high level, by Schmidt's reverser I27 and reverser I28, make standby signal n24 and node n22 same-phase, NMOS pipe M26 conducting at this moment, resistive short.
When input signal n20 voltage rises to reverse breakdown voltage greater than NPN pipe Q20 and Q21, NPN pipe Q20 path begins that electric current is arranged, electric current flows through NPN pipe Q22 and Q23 and resistance R 21, on node n21, produce voltage, in case node n21 voltage is greater than the cut-in voltage of NMOS pipe M24, NMOS pipe M24 conducting drags down the voltage of node n22, standby signal n24 and node n22 same-phase also are low level, NMOS pipe M26 turn-offs, the voltage jump of node n25 increases the pressure drop on the resistance R 22, and this makes node n21 voltage increase, and the conducting of M24 is strengthened, the voltage of node n22 is lower, forms positive feedback; The voltage of node n22 drags down simultaneously, PMOS pipe M25 conducting, NPN pipe Q20 short circuit is fallen, the voltage of node n23 equates fully with input signal n20, node n23 voltage jump increases the reverse breakdown voltage of a NPN pipe, and node n21 voltage also increases same value, and the conducting of M24 is strengthened, the voltage of node n22 is lower, forms positive feedback.The voltage oscillogram of node as shown in Figure 3.
When input signal n20 voltage drops to reverse breakdown voltage less than NPN pipe Q21, NPN pipe Q20 path does not have electric current, the voltage of node n21 descends, in case node n21 voltage is less than the cut-in voltage of NMOS pipe M24, NMOS pipe M24 turn-offs, resistance R 20 is drawn high node n22 and is high level, standby signal n24 and node n22 same-phase also are high level, M26 is open-minded for the NMOS pipe, and resistance R 22 short circuits, the voltage jump of node n25 reduces the pressure drop on the resistance R 22, this makes node n21 voltage reduce, the shutoff of NMOS pipe M24 is strengthened, and the voltage of node n22 is higher, forms positive feedback; The voltage of node n22 is drawn high simultaneously, PMOS pipe M25 ends, the voltage of node n23 and input signal n20 differ the reverse breakdown voltage of a NPN pipe, node n23 voltage jump reduces the reverse breakdown voltage of a NPN pipe, node n21 voltage also continues to reduce, the shutoff of NMOS pipe M24 is strengthened, and the voltage of node n22 is higher, forms positive feedback.The voltage oscillogram of node as shown in Figure 4.
And input signal n20 voltage is greater than the reverse breakdown voltage of two NPN pipes when uphill process, is less than the reverse breakdown voltage of a NPN pipe when the decline process, and cut-in voltage and shutoff voltage have certain difference, forms the self-starting characteristic.
Claims (7)
1. the control method of a self-start circuit, it is characterized in that described method is by the controlling of sampling module, self-starting signal generator module and enabling signal provide module to realize, wherein the controlling of sampling module is accepted input signal, judge the intensity of its signal, whether decision control sample circuit will accept input signal, be self-start circuit holding state or operating state, when being in holding state, the output signal of controlling of sampling module is a low level, do not change with input signal, when being in operating state, the intensity of controlling of sampling module output signal is directly proportional with the intensity of input signal;
The self-starting signal generator module is used for when holding state, when the voltage of the voltage monitoring node of main circuit changes to exceptional value, the self-starting signal is offered the startup node of main circuit;
Enabling signal provides module, provides the standby signal of control main circuit operating state, when standby signal is standby level, main circuit is in the holding state shut-down operation, when standby signal when standby level is converted into triggering level, main circuit is in running order, carries out its operation.
2. the control method of self-start circuit as claimed in claim 1 is characterized in that described method also comprises the Control Node that described enabling signal provides the signal of module to send to main circuit, so that control the operating state of main circuit.
3. the self-start circuit of the control method of the self-start circuit of realization claim 1 is characterized in that described circuit comprises that controlling of sampling module, self-starting signal generator module and enabling signal provide module; Wherein enabling signal provides module to connect controlling of sampling module, self-starting signal generator module and main circuit respectively, wherein the controlling of sampling module is accepted input signal and is provided module output signal to enabling signal, the self-starting signal generator module provides module output self-starting signal to enabling signal, enabling signal provides module respectively to controlling of sampling module and self-starting signal generator module output feedback signal, and to main circuit output standby/enabling signal.
4. self-start circuit as claimed in claim 3 is characterized in that described enabling signal provides module to connect the Control Node of main circuit.
5. self-start circuit as claimed in claim 3 is characterized in that described circuit comprises two NPN pipes (Q20-Q21) that oppositely connect, and this NPN pipe is operated in the reverse breakdown district.
6. self-start circuit as claimed in claim 3 is characterized in that described circuit comprises regenerative circuit, and this regenerative circuit is managed Q21, NMOS pipe M24, resistance R 20 and PMOS pipe M25 by NPN and formed.
7. self-start circuit as claimed in claim 3 is characterized in that described circuit comprises regenerative circuit, and this regenerative circuit is made up of NMOS pipe M24 and M26, resistance R 21 and R22, Schmidt's reverser (I27), reverser (I28).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710075671 CN101145739B (en) | 2007-08-10 | 2007-08-10 | Control method of self-start circuit and its circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710075671 CN101145739B (en) | 2007-08-10 | 2007-08-10 | Control method of self-start circuit and its circuit |
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| CN101145739A CN101145739A (en) | 2008-03-19 |
| CN101145739B true CN101145739B (en) | 2010-09-29 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111130151B (en) * | 2019-11-28 | 2021-02-19 | 中国地质大学（武汉） | Self-turn-off and self-start low-power consumption voltage monitoring circuit |
| CN114447899B (en) * | 2021-12-22 | 2023-09-26 | 成都市易冲半导体有限公司 | Voltage doubling starting self-adaptive protection circuit and method for wireless charging system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2498637Y (en) * | 2001-07-13 | 2002-07-03 | 福建省轮船总公司通信导航技术服务分公司 | Self set-up voltage stable electric source with overcurrent and overvoltage protector |
| CN201113790Y (en) * | 2007-08-10 | 2008-09-10 | 深圳市明微电子有限公司 | Self startup circuit |
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2007
- 2007-08-10 CN CN 200710075671 patent/CN101145739B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2498637Y (en) * | 2001-07-13 | 2002-07-03 | 福建省轮船总公司通信导航技术服务分公司 | Self set-up voltage stable electric source with overcurrent and overvoltage protector |
| CN201113790Y (en) * | 2007-08-10 | 2008-09-10 | 深圳市明微电子有限公司 | Self startup circuit |
Non-Patent Citations (2)
| Title |
|---|
| 魏茂安.一种使UPS自启动和自退出的实用电路.电子与自动化 4.1999,(4),47. |
| 魏茂安.一种使UPS自启动和自退出的实用电路.电子与自动化 4.1999,(4),47. * |
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