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Voltage detection method and circuit and switching power supply with voltage detection circuit

A voltage detection method and a switching power supply technology, which are applied in the electronic field, can solve the problems of power loss, large volume, and complex detection circuit structure, and achieve the effects of improving conversion efficiency, simple circuit implementation, and reducing circuit cost.

Active Publication Date: 2013-12-25
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Adopting the first technical solution, due to the use of photoelectric coupling devices, the structure of the detection circuit is complicated and the cost is high;
[0010] With the second technical solution, although the photoelectric coupling devices are reduced, the use of this technical solution requires the application of an auxiliary winding with a large volume and high cost, and there is still a problem of circuit cost, and the auxiliary winding itself will cause power loss. It is not conducive to improving the conversion efficiency of switching power supply

Method used

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  • Voltage detection method and circuit and switching power supply with voltage detection circuit
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  • Voltage detection method and circuit and switching power supply with voltage detection circuit

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Embodiment 1

[0074] see Figure 4 , the present embodiment provides a voltage detection method, which mainly includes the following steps:

[0075] Step 401: Generate a first current according to a first voltage and a conversion resistance.

[0076] During the working process of the switching power supply, according to the inductance current of the inductor in the switching power supply, the first time period T1 and the second time period T2 in each switching cycle are determined.

[0077] Wherein, the switching period in the embodiment of the present invention refers to the switching period of the power switch in the switching power supply.

[0078] In any switching cycle, the time period in which the inductor current continues to rise is recorded as the first time period, which is marked as T1, and the time period in which the inductor current continues to decrease is recorded as the second time period, which is recorded as T2.

[0079] For example, see Figure 5 As shown, in a switch...

Embodiment 2

[0116] As an illustration of this embodiment, this embodiment provides a method for detecting the output voltage of a switching power supply, see Figure 6 Shown, its difference with embodiment 1 is:

[0117] After step 404, step 605 is further included:

[0118] Step 605: Compare the initial voltage of the detection capacitor with the detection voltage, and determine the current output voltage state of the switching power supply according to the comparison result.

[0119] When Vc(T1+T2)>Vco, due to at this time That is, the current output voltage Vo of the switching power supply is greater than the set output voltage at this time;

[0120] When Vc(T1+T2)=Vco, and That is, the current output voltage Vo of the switching power supply is equal to the set output voltage at this time.

[0121] When Vc(T1+T2) and That is, at this time, the current output voltage Vo of the switching power supply is lower than the set output voltage.

[0122] The voltage comparison in th...

Embodiment 3

[0125] As an illustration of this embodiment, this embodiment provides a voltage detection method, see Figure 7 Shown, its difference with embodiment 1 mainly lies in:

[0126] After step 404, step 706 is further included:

[0127] Step 706: Reset the voltage of the detection capacitor in the third time period of each switching cycle.

[0128] Wherein, the third time period T3 is: in each switching cycle, the time period from the end of the second time period T2 to the arrival of the next switching cycle, that is, the period from the end of the second time period T2 to the next switching cycle The time period between the start moments of the first time period T1.

[0129] As an illustration of this example, see Figure 9 As shown, the third time period T3 may be, but not limited to, specifically: in each switching period, after the inductor current reaches zero, resonance occurs near zero and gradually stabilizes at zero.

[0130] Return after step 706, so as to perform c...

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Abstract

The invention relates to the field of electrons and discloses a voltage detection method and circuit and a switching power supply with the voltage detection circuit. The voltage detection method comprises the steps of generating first current according to first voltage and transformed resistance, using the first current to charge a detection capacitor within a first time period of each switching period, and using preset second current to charge the detection capacitor within a second time period of each switching period, wherein the current directions of the second current and the first current flowing through the detection capacitor are opposite, and voltage at two ends of the detection capacitor at the finish moment of the second time period of each switching period is detection voltage, so that the current output valve state of the switching power supply is determined according to the detection voltage.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a voltage detection method and circuit and a switching power supply with the voltage detection circuit. Background technique [0002] The switching power supply converts the DC voltage into a stable or adjustable DC voltage, and is widely used to provide voltage for the circuit system of electronic products. [0003] When the switching power supply supplies power to electronic products, if the current output voltage of the switching power supply is lower than the required working voltage of the current electronic product, it may affect the working circuit of the electronic product and cause it to fail to work normally; if the current output voltage of the switching power supply is too high, It may also burn electronic products. Therefore, people always expect the current output voltage of the switching power supply to meet the output voltage value required for the normal operation of ...

Claims

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Application Information

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IPC IPC(8): G01R19/00H02M3/10H02M1/00
CPCH02M3/156G01R19/0084H02M3/155H02M3/335H02M3/33507H02M1/0009G01R15/16
Inventor 韩云龙
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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