CN202818099U - High-efficiency switch power supply frequency modulation circuit - Google Patents
High-efficiency switch power supply frequency modulation circuit Download PDFInfo
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- CN202818099U CN202818099U CN 201220348153 CN201220348153U CN202818099U CN 202818099 U CN202818099 U CN 202818099U CN 201220348153 CN201220348153 CN 201220348153 CN 201220348153 U CN201220348153 U CN 201220348153U CN 202818099 U CN202818099 U CN 202818099U
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Abstract
The utility model discloses a high-efficiency switch power supply frequency modulation circuit, comprising a control circuit, a PWM control IC and a detection circuit, wherein the control circuit is connected with the PWM control IC and the detection circuit respectively, the control circuit comprises a circuit formed by a triode Q1, a resistor R1, a resistor RT and a capacitor CT, the emitter electrode of the triode Q1 is connected the resistor R1 and then grounded, the base electrode of the triode Q1 is connected with the operation amplifier U1-A in the detection circuit, the collector electrode of the triode Q1 is connected with the PWM control IC, the resistor RT and the capacitor CT are connected in parallel, then one end of the resistor RT or the capacitor CT is connected with the PWM control IC, the other end of the resistor RT or the capacitor CT is grounded, the detection circuit comprises an operation amplifier, a reference voltage and a detection voltage, the positive pole of the operation amplifier is connected with the reference voltage, the negative pole of the operation amplifier is connected with the detection voltage, and the detection voltage is connected with an external load circuit. The high-efficiency switch power supply frequency modulation circuit can perform external control on an IC, thereby being convenient in use, and satisfying the market demands for a high-efficiency switch power supply frequency modulation circuit.
Description
Technical field
The utility model relates to a kind of FM circuit, particularly a kind of efficient switch power supply FM circuit.
Background technology
Switching Power Supply is to keep the power supply of regulated output voltage by control switch pipe duty ratio, and when the operating frequency of switch is higher, switching loss is just larger, has reduced the conversion efficiency of power supply, thereby has limited its effect.With regard to the FM circuit of Switching Power Supply, normally steady job frequency of IC in the market, so when underloading, semi-load, cause the efficient of Switching Power Supply on the low side owing to the operating frequency height, also some frequency reducing IC can reduce operating frequency, but it is in the IC internal control that frequency is switched, and the outside is inconvenient to adjust.Therefore, the difficult adjustment of FM circuit, the efficient that have Switching Power Supply now are not high, are difficult to satisfying the market to the demand of efficient switch power supply.
Summary of the invention
For the deficiencies in the prior art, the utility model provides a kind of IC is carried out external control, uses easily efficient switch power supply FM circuit.
The technical solution of the utility model is: a kind of efficient switch power supply FM circuit, comprise PWM control IC, control circuit and testing circuit, described control circuit is connected with testing circuit with PWM control IC respectively, control circuit comprises by triode Q1, resistance R 1, the circuit that resistance R T and capacitor C T consist of, ground connection after the emitter of described triode Q1 and resistance R 1 series connection, the base stage of triode Q1 is connected with operational amplifier U1-A in the testing circuit, the collector electrode of triode Q1 is connected with PWM control IC, resistance R T with capacitor C T parallel connection be connected an end and PWM control IC and be connected, other end ground connection, testing circuit comprises operational amplifier, reference voltage and detection voltage, the positive pole of described operational amplifier is connected with reference voltage, and the negative pole of operational amplifier is connected with detection voltage.
Described detection voltage is connected with external load circuit.
The beneficial effects of the utility model are:
1, compare from the detection voltage of operational amplifier negative pole input with from the reference voltage of the anodal input of operational amplifier after, when detection voltage is higher than reference voltage, by the operational amplifier output low level, make triode Q1 cut-off, disconnected R1 this moment, because resistance R 1 and resistance R T are in parallel, make all-in resistance become large, reduce operating frequency, thereby switching loss is reduced, promoted switch power efficiency;
2, when detection voltage switching point is arranged on diverse location, can be according to the output loading size of different capacity, such as the operating frequency of any diverter switch mains switches of condition such as 10%, 20% and 30% load, reached Switching Power Supply from zero high efficiency to the full load section.
Description of drawings
Fig. 1 is the line map of a kind of efficient switch power supply FM circuit described in the utility model.
Among the figure, 1-PWM controls IC, the 2-control circuit, and the 3-testing circuit, the 4-operational amplifier, the 5-reference voltage, 6-detects voltage.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described further:
As shown in Figure 1, a kind of efficient switch power supply FM circuit, comprise PWM control IC1, control circuit 2 and testing circuit 3, control circuit 2 is connected with testing circuit with PWM control IC1 respectively and is connected, control circuit 2 comprises by triode Q1, resistance R 1, the circuit that resistance R T and capacitor C T consist of, ground connection after the emitter of triode Q1 and resistance R 1 series connection, the Pin1 of the operational amplifier 4 in the base stage of triode Q1 and the testing circuit 3 is connected, the collector electrode of triode Q1 is connected with PWM control IC1, resistance R T with capacitor C T parallel connection be connected an end and PWM control IC1 and be connected, other end ground connection, testing circuit 3 comprises operational amplifier 4, reference voltage 5 and detection voltage 6, the positive pole of operational amplifier 4 is connected with reference voltage 5, and the negative pole of operational amplifier 4 is connected with detection voltage 6, detects voltage 6 and is connected with the external load circuit (not shown).
The utility model is by after comparing from the detection voltage of operational amplifier negative pole input with from the anodal reference voltage of inputting of operational amplifier, when detection voltage is higher than reference voltage, by the operational amplifier output low level, make triode Q1 cut-off, disconnected R1 this moment, because resistance R 1 and resistance R T are in parallel, make all-in resistance become large, reduce operating frequency, thereby switching loss is reduced, promoted switch power efficiency; When detecting the setting of voltage switching point not simultaneously, can according to the output loading size of different capacity, such as the operating frequency of any diverter switch mains switches of condition such as 10%, 20% and 30% load, reach Switching Power Supply from zero high efficiency to the full load section.The utility model carries out external control to IC, and it is convenient to use, and has satisfied the demand of market to efficient switch power supply FM circuit.
Claims (2)
1. efficient switch power supply FM circuit, comprise PWM control IC, control circuit and testing circuit, it is characterized in that: described control circuit is connected with testing circuit with PWM control IC respectively, control circuit comprises by triode Q1, resistance R 1, the circuit that resistance R T and capacitor C T consist of, ground connection after the emitter of described triode Q1 and resistance R 1 series connection, the base stage of triode Q1 is connected with operational amplifier U1-A in the testing circuit, the collector electrode of triode Q1 is connected with PWM control IC, resistance R T with capacitor C T parallel connection be connected an end and PWM control IC and be connected, other end ground connection, testing circuit comprises operational amplifier, reference voltage and detection voltage, the positive pole of described operational amplifier is connected with reference voltage, and the negative pole of operational amplifier is connected with detection voltage.
2. efficient switch power supply FM circuit according to claim 1, it is characterized in that: described detection voltage is connected with external load circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220348153 CN202818099U (en) | 2012-07-18 | 2012-07-18 | High-efficiency switch power supply frequency modulation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220348153 CN202818099U (en) | 2012-07-18 | 2012-07-18 | High-efficiency switch power supply frequency modulation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202818099U true CN202818099U (en) | 2013-03-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220348153 Expired - Fee Related CN202818099U (en) | 2012-07-18 | 2012-07-18 | High-efficiency switch power supply frequency modulation circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202818099U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259394A (en) * | 2013-05-31 | 2013-08-21 | 东莞铭普光磁股份有限公司 | Adjunct circuit of frequency-conversion and phase-shifted full-bridge converter |
-
2012
- 2012-07-18 CN CN 201220348153 patent/CN202818099U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259394A (en) * | 2013-05-31 | 2013-08-21 | 东莞铭普光磁股份有限公司 | Adjunct circuit of frequency-conversion and phase-shifted full-bridge converter |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130320 Termination date: 20180718 |