CN211859913U - Linear starting circuit for high-voltage input DCDC power supply - Google Patents
Linear starting circuit for high-voltage input DCDC power supply Download PDFInfo
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- CN211859913U CN211859913U CN202020204767.7U CN202020204767U CN211859913U CN 211859913 U CN211859913 U CN 211859913U CN 202020204767 U CN202020204767 U CN 202020204767U CN 211859913 U CN211859913 U CN 211859913U
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- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 title claims abstract description 29
- 238000012544 monitoring process Methods 0.000 claims abstract description 21
- 239000003990 capacitor Substances 0.000 claims description 20
- 238000004804 winding Methods 0.000 abstract description 4
- 238000001914 filtration Methods 0.000 abstract description 2
- 230000001276 controlling effect Effects 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses construct a linear starting circuit for DCDC power of high pressure input, including one be used for with the linear adjustment circuit of the voltage of adjusting the direct current voltage of input for being fit for power state monitoring singlechip work, one be used for at the open circuit of power standby state disconnection control system power, a power state monitoring singlechip and a support electric capacity. When the DCDC power supply works, the DCDC power supply generally supplies power to the power control system through rectification and filtering of the auxiliary winding of the transformer, and at the moment, the starting circuit stops working. When the DCDC power supply is in a standby state, the starting circuit supplies power to the power control system, if the input voltage is high, the power supply of the control system is low, so that a large voltage difference exists between two ends of the adjusting tube, and the adjusting tube can be damaged as long as the current flowing through the adjusting tube is slightly large. The utility model discloses utilize the power supply except that the power supply of power state monitoring singlechip is cut off when the power is in standby state to the break-off circuit, has guaranteed that the electric current through adjusting circuit is as little as possible to reduced the consumption of adjustment pipe, avoided it to become the focus or damage, thereby improved the reliability of high pressure input DCDC power.
Description
Technical Field
The utility model relates to a power field, more specifically say, relate to a linear starting circuit that is used for high voltage input's DCDC power.
Background
In a DCDC power supply, there is typically a start-up circuit for providing a relatively stable voltage to the power control circuit when the rest of the power supply is not in operation. The starting circuit of the existing DCDC power supply mainly comprises a most basic linear voltage stabilizing circuit through a voltage stabilizing diode and a triode. Before the power supply starts to work, the linear voltage stabilizing circuit provides a relatively stable voltage to the power supply control circuit, so that the power supply control circuit can start to work; after the DCDC power supply works, the DCDC power supply is rectified and filtered by an auxiliary winding of a transformer to supply power to the power supply control circuit, and at the moment, the starting circuit stops working. The added auxiliary winding supplies power, so that the power consumption of the linear voltage stabilizing circuit can be reduced, and the product efficiency is improved. Although the existing linear starting circuit can realize the functions, the following disadvantages exist: in the standby state of the power supply, the energy of the control system is provided by the starting circuit, and particularly under the condition that the input voltage is high, the loss of the linear source is considerable, and the regulating tube of the linear source can become a hot spot, so that the reliability of the DCDC power supply is reduced.
Disclosure of Invention
An object of the utility model is to provide a linear starting circuit for high voltage input's DCDC power. To solve the problems set forth in the background art described above.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a linear starting circuit for a high-voltage input DCDC power supply is constructed, and comprises a linear adjusting circuit, a disconnection circuit, a power supply state monitoring singlechip and a supporting capacitor, wherein the linear adjusting circuit is used for linearly adjusting an input direct-current voltage to a voltage suitable for the work of a power supply state monitoring singlechip, the disconnection circuit is used for disconnecting a control system power supply in a power supply standby state, and the power supply state monitoring singlechip is connected with the supporting capacitor.
Furthermore, the linear adjusting circuit comprises a first capacitor, a first resistor, a first voltage regulator tube and a first MOS tube (N tube); the input direct-current voltage and one end of a first resistor are connected with a drain electrode of a first MOS (N-type transistor); the other end of the first resistor, the cathode of the first voltage-regulator tube and one end of the first capacitor are connected with the grid electrode of the first MOS tube (N tube); the anode of the first voltage-stabilizing tube and the other end of the first capacitor are connected with the ground potential.
Furthermore, the disconnection circuit comprises a second resistor, a third resistor, a fourth resistor, a second MOS transistor (P transistor) and a third MOS transistor (N transistor); a source electrode of the first MOS tube (N tube), a power supply end VCC of the power supply state monitoring singlechip, one end of the second resistor and a source electrode of the second MOS tube (P tube) are connected; the other end of the second resistor, the grid of the second MOS tube (P tube) and one end of the third resistor are connected; the other end of the third resistor is connected with the drain electrode of a third MOS (metal oxide semiconductor) tube (N tube); the source electrode of the third MOS tube (N tube) is connected with the ground potential, and the grid electrode of the third MOS tube (N tube) is connected with one end of the fourth resistor; the other end of the fourth resistor is connected with a control end EN of the power state monitoring singlechip for controlling the DCDC power switch.
Furthermore, one end of the supporting capacitor, the drain electrode of the second MOS tube (P tube) and a power supply PVCC of the control system are connected; and the other end of the supporting capacitor is connected with the ground potential.
The utility model has the advantages that: when the DCDC power supply works, the DCDC power supply generally supplies power to the power control system through rectification and filtering of the auxiliary winding of the transformer, and at the moment, the starting circuit stops working. When the DCDC power supply is in a standby state, the starting circuit supplies power to the power control system, if the input voltage is high, the power supply of the control system is low, so that a large voltage difference exists between two ends of the adjusting tube, and the adjusting tube can be damaged as long as the current flowing through the adjusting tube is slightly large. The utility model discloses utilize the power supply except that the power supply of power state monitoring singlechip is cut off when the power is in standby state to the break-off circuit, has guaranteed that the electric current through adjusting circuit is as little as possible to reduced the consumption of adjustment pipe, avoided it to become the focus or damage, thereby improved the reliability of high pressure input DCDC power.
Drawings
Fig. 1 is a schematic block diagram of an implementation circuit of the present invention.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
Referring to fig. 1, a linear start circuit for a high voltage input DCDC power supply includes a linear regulator circuit for linearly regulating an input dc voltage to a voltage suitable for an operation of a power state monitoring single chip, a disconnection circuit for disconnecting a power of a control system in a power standby state, a power state monitoring single chip, and a support capacitor.
Furthermore, the linear adjusting circuit comprises a first capacitor C1, a first resistor R1, a first voltage regulator tube D1 and a first MOS tube (N tube) Q1; an input direct-current voltage Vin and one end of a first resistor R1 are connected with the drain electrode of a first MOS (N tube) Q1; the other end of the first resistor R1, the cathode of the first voltage regulator tube D1 and one end of the first capacitor C1 are connected with the grid of a first MOS tube (N tube) Q1; the anode of the first regulator D1 and the other end of the first capacitor C1 are connected to ground potential.
Furthermore, the disconnection circuit comprises a second resistor R2, a third resistor R3, a fourth resistor R4, a second MOS transistor (P transistor) Q2 and a third MOS transistor (N transistor) Q3; the source electrode of a first MOS (N-transistor) Q1, a power supply end VCC of the power supply state monitoring singlechip, one end of a second resistor R2 and the source electrode of a second MOS (P-transistor) Q2 are connected; the other end of the second resistor R2, the grid of the second MOS transistor (P transistor) Q2 and one end of the third resistor R3 are connected; the other end of the third resistor R3 is connected with the drain electrode of a third MOS transistor (N transistor) Q3; the source electrode of the third MOS (N) transistor Q3 is connected with the ground potential, and the grid electrode of the third MOS transistor Q3 is connected with one end of a fourth resistor R4; the other end of the fourth resistor R4 is connected with a control end EN of the power state monitoring singlechip for controlling the DCDC power switch.
Furthermore, one end of the supporting capacitor C2, the drain of a second MOS (P) transistor Q2 and a power supply PVCC of a control system are connected; the other end of the support capacitor C2 is connected to ground potential.
The linear circuit converts an input voltage into a low voltage VCC to supply power to a control system; because the input is high voltage and is limited by packaging and heat dissipation conditions, the current which can pass through a first MOS tube (N tube) of an adjusting tube of the linear circuit is limited, otherwise, the adjusting tube can be damaged; the utility model discloses an add a break-off circuit and realize flowing the electric current of adjusting the pipe as far as possible little during by starting circuit for the control system power supply between VCC and control system power supply. The working principle of the disconnection circuit is as follows: once the DCDC power supply is in a standby state, the control end EN of the power supply state monitoring singlechip for controlling the DCDC power supply switch is in a low level, on one hand, the control pulse of a main circuit switch tube is blocked, and the main circuit is in a standby state; on the other hand, the fourth resistor R4 turns off the third MOS transistor (N transistor) Q3, and at this time, the source-gate potential of the second MOS transistor (P transistor) Q2 is also turned off; at the moment, VCC and PVCC are disconnected, the linear circuit only needs to supply power to the power state monitoring singlechip, and the current flowing through the first MOS (N) tube of the adjusting tube is greatly reduced. When the DCDC power supply is in a working state, the control end EN of the power supply state monitoring singlechip for controlling the DCDC power supply switch to be in a high level, the third MOS tube (N tube) Q3 is switched on through the fourth resistor R4, and the source electrode potential of the second MOS tube (P tube) Q2 is higher than the grid electrode potential and is also switched on; such as VCC and PVCC connections, the DCDC power supply can start up normally.
The present invention is not limited to the above preferred embodiments, and any other products similar or identical to the present invention, which can be obtained by anyone with the teaching of the present invention, fall within the protection scope of the present invention.
Claims (4)
1. A linear starting circuit for a high-voltage input DCDC power supply comprises a linear adjusting circuit, a disconnection circuit, a power state monitoring singlechip and a supporting capacitor, wherein the linear adjusting circuit is used for linearly adjusting an input direct-current voltage to a voltage suitable for a power state monitoring singlechip to work, the disconnection circuit is used for disconnecting a control system power supply in a power standby state, and the power state monitoring singlechip is connected with the supporting capacitor.
2. The linear start-up circuit of claim 1, wherein the linear start-up circuit comprises: the linear adjusting circuit comprises a first capacitor, a first resistor, a first voltage regulator tube and a first N-channel MOS tube; the input direct-current voltage and one end of the first resistor are connected with the drain electrode of the first N-channel MOS tube; the other end of the first resistor, the cathode of the first voltage-regulator tube and one end of the first capacitor are connected with the grid electrode of the first N-channel MOS tube; the anode of the first voltage-stabilizing tube and the other end of the first capacitor are connected with the ground potential.
3. The linear start-up circuit of claim 1, wherein the linear start-up circuit comprises: the disconnection circuit comprises a second resistor, a third resistor, a fourth resistor, a second P-channel MOS tube and a third N-channel MOS tube; the source electrode of the first N-channel MOS tube, the power supply end VCC of the power supply state monitoring singlechip, one end of the second resistor and the source electrode of the second P-channel MOS tube are connected; the other end of the second resistor, the grid electrode of the second P-channel MOS tube and one end of the third resistor are connected; the other end of the third resistor is connected with the drain electrode of the third N-channel MOS tube; the source electrode of the third N-channel MOS tube is connected with the ground potential, and the grid electrode of the third N-channel MOS tube is connected with one end of the fourth resistor; the other end of the fourth resistor is connected with a control end EN of the power state monitoring singlechip for controlling the DCDC power switch.
4. The linear start-up circuit of claim 1, wherein the linear start-up circuit comprises: one end of the supporting capacitor, the drain electrode of the second P-channel MOS tube and a power supply PVCC of the control system are connected; and the other end of the supporting capacitor is connected with the ground potential.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020204767.7U CN211859913U (en) | 2020-02-25 | 2020-02-25 | Linear starting circuit for high-voltage input DCDC power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020204767.7U CN211859913U (en) | 2020-02-25 | 2020-02-25 | Linear starting circuit for high-voltage input DCDC power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211859913U true CN211859913U (en) | 2020-11-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020204767.7U Expired - Fee Related CN211859913U (en) | 2020-02-25 | 2020-02-25 | Linear starting circuit for high-voltage input DCDC power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211859913U (en) |
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2020
- 2020-02-25 CN CN202020204767.7U patent/CN211859913U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201103 |