CN201130847Y - Power supply circuit with testing and protection function - Google Patents
Power supply circuit with testing and protection function Download PDFInfo
- Publication number
- CN201130847Y CN201130847Y CNU2007201715878U CN200720171587U CN201130847Y CN 201130847 Y CN201130847 Y CN 201130847Y CN U2007201715878 U CNU2007201715878 U CN U2007201715878U CN 200720171587 U CN200720171587 U CN 200720171587U CN 201130847 Y CN201130847 Y CN 201130847Y
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- Prior art keywords
- power supply
- resistance
- pressurizer
- circuit
- adjustable parallel
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Abstract
The utility model discloses an electric power supply circuit with detection and protection functions, which comprises a PWM IC, a switching transistor connected between the PWM IC and an electric power supply VCC, an adjustable parallel precision voltage stabilizer also connected with the switching transistor, and a divider resistance connected between the adjustable parallel precision voltage stabilizer and a PFC circuit; the adjustable parallel precision voltage stabilizer performs the switching control of the transistor Q1 so as to realize the detection of normal operation of the PFC circuit and then perform electric power supply control of secondary circuit, thereby avoiding the fault actions and abnormal output of circuit.
Description
[technical field]
The utility model relates to IC low-voltage power supply technical field, particularly a kind of power supply circuits with detection and defencive function.
[background technology]
Containing PWM (pulse-width modulation) circuit that PFC (Active Power Factor Correction) circuit and needs produce drive signal, or other with interlock circuit that PFC combines in, traditional PWM IC or interlock circuit operating voltage are the VCC pins that directly is fed to IC by one tunnel independence small voltage.Still do not have at pfc circuit under the situation of operate as normal, arrived in PWM IC or the described interlock circuit, then just might cause misoperation, thereby cause circuit that unusual output is arranged if directly be fed to the independent small voltage of IC VCC pin.
[novel content]
For addressing the above problem, main purpose of the present utility model is to provide a kind of power supply circuits with detection and defencive function, causes misoperation to avoid pfc circuit under the condition of not working as yet, causes circuit abnormality output.
For achieving the above object, the technical scheme of this creation is: a kind of power supply circuits with detection and defencive function.
A kind of have detect and the power supply circuits of defencive function, include PWM IC, be connected in switch triode between PWMIC and the power supply VCC, and switch triode also be connected with adjustable parallel precise pressurizer and be connected in divider resistance between this adjustable parallel precise pressurizer and the pfc circuit.
Further, described switch triode is the PNP triode, and wherein, the collector electrode of triode is connected to the VCC pin of PWM IC, and emitter connects power supply VCC, and base stage is connected to adjustable parallel precise pressurizer.
Further, described have detect and the power supply circuits of defencive function, it is characterized in that: be connected with current-limiting resistance R5 between the base stage of described switch triode and the adjustable parallel precise pressurizer and be connected.
Further, described divider resistance is connected in series in together, is respectively resistance R 0, resistance R 1, resistance R 2, resistance R 3 and resistance R 4.
Compared to prior art, the utlity model has detect and the power supply circuits of defencive function by of the switch control of adjustable parallel precise pressurizer to triode Q1, realize the whether detection of operate as normal of pfc circuit is controlled the power supply of next stage circuit.Thereby can avoid circuit to cause misoperation, and the unusual output of circuit.
[description of drawings]
Fig. 1 is the circuit theory diagrams that the utlity model has the power supply circuits of detection and defencive function.
[embodiment]
Please refer to shown in Figure 1; the utility model is a kind of to have and detects and the power supply circuits of defencive function, comprise PWM IC, be connected in switch triode between PWM IC and the power supply VCC, and switch triode also be connected with adjustable parallel precise pressurizer, be connected in the divider resistance between this adjustable parallel precise pressurizer and the pfc circuit.
Described switch triode is the PNP triode, and wherein, the collector electrode of triode is connected to the VCC pin of PWM IC, and emitter connects power supply VCC, and base stage connects adjustable parallel precise pressurizer by current-limiting resistance R5.VCC also provides bias voltage for the base stage of triode by a biasing resistor R6.
Described divider resistance is connected in series in together, is respectively resistance R 0, resistance R 1, resistance R 2, resistance R 3 and resistance R 4, is parallel with soft start capacitor C1 with resistance R 4.Wherein, divider resistance R0, R1, R2, R3, R4 partly obtain the dividing potential drop that A is ordered from PFC, when A point voltage during greater than 2.5 volts, and the conducting of adjustable parallel precise pressurizer.Resistance R 4, capacitor C 1 and adjustable parallel precise pressurizer one end ground connection.Described in the present embodiment C1 is common ceramic disc capacitor, to filter disturbing pulse, avoids causing because of disturbing pulse the misoperation of adjustable parallel precise pressurizer.
When pfc circuit is working properly, dividing potential drop by divider resistance R0, R1, R2, R3, R4, the A voltage of obtaining of naming a person for a particular job is Va=(R4/R0+R1+R2+R3+R4) * Vpfc=2.649V, be slightly larger than 2.5V, adjustable parallel precise pressurizer conducting this moment, the base voltage of triode Q1 is dragged down, and triode Q1 conducting has just realized that to PWM IC and interlock circuit power supply, entire circuit can be operated under the reliable relatively state.
During the pfc circuit operation irregularity, PFC output does not reach 400V, and the voltage that A is ordered is far below 2.5V, and adjustable parallel precise pressurizer is in off state, and triode Q1 can't conducting, and power supply VCC just can't arrive in PWM IC or the interlock circuit.Thereby realized that PWM IC or interlock circuit can misoperations under the situation of operate as normal and produce output at pfc circuit, made the next stage circuit can not be damaged, thereby realized the detection of PFC and the function of protection next stage circuit.
Most preferred embodiment described above only is that the utility model is set forth and illustrated, but is not limited to disclosed any concrete form, and it is possible carrying out many modifications and variations.
Claims (5)
1. one kind has and detects and the power supply circuits of defencive function; include PWM IC, it is characterized in that: also include the switch triode that is connected between PWM IC and the power supply VCC, and switch triode also be connected with adjustable parallel precise pressurizer and be connected in divider resistance between this adjustable parallel precise pressurizer and the pfc circuit.
2. the power supply circuits with detection and defencive function as claimed in claim 1; it is characterized in that: described switch triode is the PNP triode; wherein; the collector electrode of triode is connected to the VCC pin of PWM IC; emitter connects power supply VCC, and base stage is connected to adjustable parallel precise pressurizer.
3. as claimed in claim 2 have detect and the power supply circuits of defencive function, it is characterized in that: be connected with current-limiting resistance R5 between the base stage of described switch triode and the adjustable parallel precise pressurizer and be connected.
4. the power supply circuits with detection and defencive function as claimed in claim 2, it is characterized in that: described divider resistance is connected in series in together, is respectively resistance R 0, resistance R 1, resistance R 2, resistance R 3 and resistance R 4.
5. the power supply circuits with detection and defencive function as claimed in claim 4 is characterized in that: be parallel with soft start capacitor C1 with described resistance R 4, resistance R 4, capacitor C 1 and adjustable parallel precise pressurizer one end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201715878U CN201130847Y (en) | 2007-12-19 | 2007-12-19 | Power supply circuit with testing and protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201715878U CN201130847Y (en) | 2007-12-19 | 2007-12-19 | Power supply circuit with testing and protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201130847Y true CN201130847Y (en) | 2008-10-08 |
Family
ID=40018713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201715878U Expired - Fee Related CN201130847Y (en) | 2007-12-19 | 2007-12-19 | Power supply circuit with testing and protection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201130847Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102299501A (en) * | 2010-06-28 | 2011-12-28 | 比亚迪股份有限公司 | Undervoltage protection circuit |
| CN105938380A (en) * | 2016-06-24 | 2016-09-14 | 广州三晶电气股份有限公司 | Auxiliary power supply control circuit of photovoltaic inverter |
| CN116545249A (en) * | 2023-07-05 | 2023-08-04 | 深圳市汇科源电子科技有限公司 | Detection PFC power on-off locking circuit and switching power supply |
-
2007
- 2007-12-19 CN CNU2007201715878U patent/CN201130847Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102299501A (en) * | 2010-06-28 | 2011-12-28 | 比亚迪股份有限公司 | Undervoltage protection circuit |
| CN102299501B (en) * | 2010-06-28 | 2014-03-19 | 比亚迪股份有限公司 | Undervoltage protection circuit |
| CN105938380A (en) * | 2016-06-24 | 2016-09-14 | 广州三晶电气股份有限公司 | Auxiliary power supply control circuit of photovoltaic inverter |
| CN105938380B (en) * | 2016-06-24 | 2018-01-16 | 广州三晶电气股份有限公司 | A kind of auxiliary power supply of photovoltaic inverter control circuit |
| CN116545249A (en) * | 2023-07-05 | 2023-08-04 | 深圳市汇科源电子科技有限公司 | Detection PFC power on-off locking circuit and switching power supply |
| CN116545249B (en) * | 2023-07-05 | 2024-04-16 | 深圳市汇科源电子科技有限公司 | Detection PFC power on-off locking circuit and switching power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081008 Termination date: 20141219 |
|
| EXPY | Termination of patent right or utility model |