CN204925234U - Switching power supply and voltage peak detection device thereof - Google Patents
Switching power supply and voltage peak detection device thereof Download PDFInfo
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- CN204925234U CN204925234U CN201520540521.6U CN201520540521U CN204925234U CN 204925234 U CN204925234 U CN 204925234U CN 201520540521 U CN201520540521 U CN 201520540521U CN 204925234 U CN204925234 U CN 204925234U
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Abstract
The utility model discloses a switching power supply and voltage peak detection device thereof. This voltage peak detection device include: voltage sampling circuit samples to the secondary voltage of switching power supply's transformer to filtering secondary voltage's malleation part is in order to export first voltage, voltage holding circuit, the peak voltage who keeps first voltage is with output second voltage, voltage amplifier circuit is with second voltage amplification and output. Use the technical scheme of the utility model, can save the converting circuit of voltage - electric current - voltage among the prior art to voltage detecting speed has been improved, also need not use CLK signal control circuit complicated among the prior art, simplify the circuit greatly, improve the stability of reliability, whole circuit is very simple, need not devices such as big resistance, big electric capacity, can be applied to single -point or multiple spot voltage measurement, linearly promptly requires not high occasion, and the circuit topology is simple, does benefit to the integration of circuit.
Description
Technical field
The utility model relates to field of switch power, particularly a kind of Switching Power Supply and voltage peak pick-up unit thereof.
Background technology
In power switch circuit, often need to detect the peak value of input voltage signal, and preserved, use to be supplied to follow-up control circuit, generally speaking, peak detection circuit requires can respond input voltage signal and provide its peak information accurately.
Application number be 201310076683.4 Chinese patent application disclose a kind of voltage peak detection circuit and detection method.As shown in the accompanying drawing 1 of this patented claim, voltage peak detection circuit of the prior art is generally directly sample to elementary input voltage, and the components and parts of sampling no matter at volume, power, or, are unfavorable for the Integration Design of circuit on cost all comparatively greatly.In view of deficiency of the prior art, it proposes a kind of DC input voitage information being obtained Switching Power Supply by voltage couples circuit, the technical scheme that then peak information to described DC input voitage processes by voltage conversion circuit and holding circuit.As shown in the accompanying drawing 2 of this patented claim, not to elementary input voltage Direct Sampling in the technical scheme of this patented claim, but sampled by the vice-side winding T3 low-voltage of coming that is coupled, by voltage conversion circuit, obtain the peak information characterizing the elementary input voltage of direct current.
Avoid directly to the problem of the elementary input voltage sampling of power stage circuit although this application solves; but its voltage conversion circuit needs to carry out voltage-to-current-voltage twice conversion to voltage; the sign voltage obtained has time delay; be difficult to meet and be used as the ageing of voltage protection circuit; and this patented claim also needs the holding circuit using the control of CLK signal, adds control complexity.
Utility model content
There is provided in the utility model embodiment that a kind of circuit is simple, cost is low, the fireballing Switching Power Supply of voltage detecting and voltage peak pick-up unit thereof.
For solving the problems of the technologies described above, the first aspect of the utility model embodiment, provides a kind of voltage peak pick-up unit of Switching Power Supply, comprising: voltage sampling circuit, the secondary voltage of the transformer of Switching Power Supply is sampled, and the malleation part of filtering secondary voltage is to export the first voltage; Voltage hold circuit, keeps the crest voltage of the first voltage to export the second voltage; Voltage amplifier circuit, exports the second voltage amplification.
As preferably, voltage sampling circuit comprises the first diode and the first amplifier, and the secondary voltage after the first diode filtering malleation part carries out reducing process to obtain the first voltage by the first amplifier.
As preferably, voltage hold circuit comprises the second diode and the first electric capacity, the first voltage by after the second diode to the unidirectional charging of the first electric capacity to keep crest voltage thus output the second voltage.
As preferably, voltage sampling circuit comprises the first diode, the first resistance, the second resistance and the first amplifier, secondary voltage is flowed into by the negative pole of the first diode, and being flowed into the reverse input end of the first amplifier through the first resistance by the positive pole of the first diode, the reverse input end of the first amplifier is connected with the output terminal of the first amplifier by the second resistance.
As preferably, voltage hold circuit comprises the second diode and the first electric capacity, the output terminal of the first amplifier is connected with the reverse input end of the first amplifier by the second diode and the second resistance, and one end that the second diode is connected with the second resistance is by the first capacity earth.
As preferably, voltage amplifier circuit comprises the second amplifier and the 3rd resistance, and one end that the second diode is connected with the second resistance is also connected with the positive input of the second amplifier, and the 3rd resistance and the first Capacitance parallel connection form discharge time constant and arrange circuit.
As preferably, voltage amplifier circuit also comprises enlargement factor for being arranged on the second amplifier to regulate the 4th resistance and the 5th resistance of the output voltage of the second amplifier.
Second aspect of the present utility model, additionally provides a kind of Switching Power Supply, comprises above-mentioned voltage peak pick-up unit.
As preferably, Switching Power Supply is inverse-excitation type switch power-supply or step-up switching power supply or adjusting and voltage-reduction switch power supply or buck-boost switching power or positive activation type Switching Power Supply or SEPIC Switching Power Supply or ZETA Switching Power Supply.
Application the technical solution of the utility model, can save the change-over circuit of voltage-to-current-voltage of the prior art, thus improve voltage detecting speed; Do not need to use CLK signal control circuit complicated in prior art yet, enormously simplify circuit, improve the stability of reliability, whole circuit is very simple, without the need to devices such as large resistance, bulky capacitor, single-point or multipoint voltage measurement can be applied to, namely the occasion that linear requirements is not high, circuit topology is simple, is beneficial to the integrated of circuit.
Accompanying drawing explanation
Fig. 1 is the structural representation of the voltage peak pick-up unit of Switching Power Supply in the utility model.
Description of reference numerals: 1, voltage sampling circuit; 2, transformer; 3, voltage hold circuit; 4, voltage amplifier circuit; 5, the first diode; 6, the first amplifier; 7, the second diode; 8, the first electric capacity; 9, the first resistance; 10, the second resistance; 11, the second amplifier; 12, the 3rd resistance; 13, the 4th resistance; 14, the 5th resistance.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, but not as to restriction of the present utility model.
Please refer to Fig. 1, the first aspect of the utility model embodiment, provides a kind of voltage peak pick-up unit of Switching Power Supply, comprising: voltage sampling circuit 1, the secondary voltage of the transformer 2 of described Switching Power Supply is sampled, and the malleation part of secondary voltage described in filtering is to export the first voltage; Voltage hold circuit 3, keeps the crest voltage of described first voltage to export the second voltage; Voltage amplifier circuit 4, exports described second voltage amplification.
During work, the secondary voltage of transformer 2 is sampled by voltage sampling circuit 1, and by voltage sampling circuit 1 by its malleation partial filtration, only retains negative pressure part.Then, the voltage only retaining negative pressure part is carried out crest voltage and keeps operation by voltage hold circuit 3, is then amplified the requirement being adjusted to applicable modulus and sampling by voltage amplifier circuit 4.
Visible, the voltage that voltage sampling circuit 1 in the utility model and voltage hold circuit 3 pairs of voltage couples circuit export is changed and keeps process, the peak voltage signal characterizing DC input voitage can be obtained, it is without the need to components and parts such as large resistance bulky capacitor, do not need voltage-to-current-voltage conversion circuit, do not need clock control signal, greatly reduce relative to prior art cost.
Owing to have employed technique scheme, compared with prior art, the utility model eliminates the change-over circuit of voltage-to-current-voltage, thus improves voltage detecting speed; Do not need to use CLK signal control circuit complicated in prior art, enormously simplify circuit, improve the stability of reliability, whole circuit is very simple, without the need to devices such as large resistance, bulky capacitor, single-point or multipoint voltage measurement can be applied to, namely the occasion that linear requirements is not high, circuit topology is simple, is beneficial to the integrated of circuit.
The utility model utilizes voltage couples circuit to obtain the information of DC input voitage, and directly do not connect power stage circuit and to sample DC input voitage information, the number of pins of chip can be reduced on the one hand, on the other hand also without the need to sampling resistor etc., thus loss can be reduced raise the efficiency.
Preferably, described voltage sampling circuit 1 comprises the first diode 5 and the first amplifier 6, and the described secondary voltage after described first diode 5 filtering malleation part carries out reducing process to obtain described first voltage by described first amplifier 6.After the first diode 5, sampled voltage only retains negative pressure part, then its amplitude is reduced by the first amplifier 6, produces too high peak voltage to avoid mutual inductance.
Preferably, described voltage hold circuit 3 comprises the second diode 7 and the first electric capacity 8, described first voltage by after described second diode 7 to the unidirectional charging of described first electric capacity 8 to keep crest voltage thus to export described second voltage.Second diode 7 can carry out unidirectional charging to the first electric capacity 8, and keeps crest voltage.
Preferably, described voltage sampling circuit 1 comprises the first diode 5, first resistance 9, second resistance 10 and the first amplifier 6, described secondary voltage is flowed into by the negative pole of described first diode 5, and being flowed into the reverse input end of described first amplifier 6 through described first resistance 9 by the positive pole of described first diode 5, the reverse input end of described first amplifier 6 is connected with the output terminal of described first amplifier 6 by described second resistance 10.In voltage sampling circuit 1, the first resistance 9 and the second resistance 10 and the first amplifier 6 are arranged in pairs or groups, and to reduce the amplitude of voltage, avoid mutual inductance to produce too high peak voltage.
Preferably, described voltage hold circuit 3 comprises the second diode 7 and the first electric capacity 8, the output terminal of described first amplifier 6 is connected with the reverse input end of described first amplifier 6 by described second diode 7 and described second resistance 10, and one end that described second diode 7 is connected with described second resistance 10 is by described first electric capacity 8 ground connection.
Preferably, described voltage amplifier circuit 4 comprises the second amplifier 11 and the 3rd resistance 12, one end that described second diode 7 is connected with described second resistance 10 is also connected with the positive input of described second amplifier 11, and described 3rd resistance 12 is in parallel with described first electric capacity 8 to be formed discharge time constant and arrange circuit.Wherein, the 3rd resistance 12 is in parallel with described first electric capacity 8 forms discharge time constant and arranges circuit, to meet modulus conversion chip to minimal sampling time requirement.In addition, preferably, described voltage amplifier circuit 4 also comprises enlargement factor for being arranged on described second amplifier 11 to regulate the 4th resistance 13 and the 5th resistance 14 of the output voltage of described second amplifier 11.Like this, the enlargement factor of the second amplifier 11 can be regulated by the 4th resistance 13 and the 5th resistance 14, get final product the amplitude voltage of regulation output.
Second aspect of the present utility model, additionally provides a kind of Switching Power Supply, comprises above-mentioned voltage peak pick-up unit.Preferably, described Switching Power Supply is inverse-excitation type switch power-supply or step-up switching power supply or adjusting and voltage-reduction switch power supply or buck-boost switching power or positive activation type Switching Power Supply or SEPIC Switching Power Supply or ZETA Switching Power Supply.
, please refer to Fig. 1 below, for an inverse-excitation type switch power-supply, be described in detail to the voltage peak pick-up unit in the utility model, in Fig. 1, vcc represents positive source.
(1) transformer 2 is high-frequency transformer, and the secondary voltage of transformer 2 is V0, which characterizes the information of elementary input voltage vin, and its proportionate relationship is:
V0=-(N2/N1) * Vin formula (1)
Wherein, N1 is the number of primary turns of transformer 2, and N2 is the secondary winding turns of transformer 2, and Vin is the elementary input voltage of transformer 2.
(2) after the first diode 5, negative voltage part is retained.Because secondary voltage V0 is actually negative pulse train voltage, negative voltage exports positive pulse sequence voltage after the first amplifier 6, and by the second diode 7 to the unidirectional charging of the first electric capacity 8, wherein, first resistance 9 and the second resistance 10 for regulating the scaling of the first amplifier 6, thus obtain the first voltage V1:
V1=-(R10/R9) * V0 formula (2)
Wherein, R9 is the resistance of the first resistance; R10 is the resistance of the second resistance.
The composition discharge loop of (3) first electric capacity 8 and the 3rd resistance 12, discharge time constant τ is: τ=C8*R12, and wherein, C8 is the capacitance of the first electric capacity, and R12 is the resistance value of the 3rd resistance.Like this, by the adjustment to the first electric capacity 8 and the 3rd resistance 12, namely can be set discharge time, i.e. the time of voltage maintenance, thus meet the requirement of analog to digital converter to minimal sampling time.
The combination of (4) second amplifiers 11 and the 4th resistance 13, the 5th resistance 14, can regulate the second voltage V2, thus obtain can the character voltage V3 of driving chip I/O port (the input end of analog signal mouth of such as analog to digital converter), its proportionate relationship is:
V3=V2* (R13+R14)/R13 formula (3)
Wherein, R13 is the resistance of the 4th resistance, and R14 is the resistance of the 5th resistance.
(5) final, character voltage V3 characterizes secondary voltage:
V3=-(R10/R9) * [-(N2/N1) * Vin] * (R13+R14)/R13 formula (4)
Above-described embodiment; take reverse exciting switching voltage regulator as application example; by the anti-phase ratio turn ratio voltage Direct Sampling to transformer 2 mutual inductance; and kept by basic peak value; again according to different modulus conversion chip demand; increase voltage amplification Circuit tuning, obtain character voltage, can be used for the voltage protection circuit of single-point or multiple spot.The principle of the Switching Power Supply of other types is similar, does not repeat them here.
Certainly, be more than preferred implementation of the present utility model.It should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model ultimate principle, can also make some improvements and modifications, these improvements and modifications are also considered as protection domain of the present utility model.
Claims (9)
1. a voltage peak pick-up unit for Switching Power Supply, is characterized in that, comprising:
Voltage sampling circuit (1), sample, and the malleation part of secondary voltage described in filtering is to export the first voltage to the secondary voltage of the transformer (2) of described Switching Power Supply;
Voltage hold circuit (3), keeps the crest voltage of described first voltage to export the second voltage;
Voltage amplifier circuit (4), exports described second voltage amplification.
2. the voltage peak pick-up unit of Switching Power Supply according to claim 1, it is characterized in that, described voltage sampling circuit (1) comprises the first diode (5) and the first amplifier (6), and the described secondary voltage after described first diode (5) filtering malleation part carries out reducing process to obtain described first voltage by described first amplifier (6).
3. the voltage peak pick-up unit of Switching Power Supply according to claim 1, it is characterized in that, described voltage hold circuit (3) comprises the second diode (7) and the first electric capacity (8), described first voltage by after described second diode (7) to the unidirectional charging of described first electric capacity (8) to keep crest voltage thus to export described second voltage.
4. the voltage peak pick-up unit of Switching Power Supply according to claim 1, it is characterized in that, described voltage sampling circuit (1) comprises the first diode (5), first resistance (9), second resistance (10) and the first amplifier (6), described secondary voltage is flowed into by the negative pole of described first diode (5), and flowed into the reverse input end of described first amplifier (6) through described first resistance (9) by the positive pole of described first diode (5), the reverse input end of described first amplifier (6) is connected with the output terminal of described first amplifier (6) by described second resistance (10).
5. the voltage peak pick-up unit of Switching Power Supply according to claim 4, it is characterized in that, described voltage hold circuit (3) comprises the second diode (7) and the first electric capacity (8), the output terminal of described first amplifier (6) is connected with the reverse input end of described first amplifier (6) by described second diode (7) and described second resistance (10), and one end that described second diode (7) is connected with described second resistance (10) is by described first electric capacity (8) ground connection.
6. the voltage peak pick-up unit of Switching Power Supply according to claim 5, it is characterized in that, described voltage amplifier circuit (4) comprises the second amplifier (11) and the 3rd resistance (12), one end that described second diode (7) is connected with described second resistance (10) is also connected with the positive input of described second amplifier (11), and described 3rd resistance (12) is in parallel with described first electric capacity (8) to be formed discharge time constant and arrange circuit.
7. the voltage peak pick-up unit of Switching Power Supply according to claim 6, it is characterized in that, described voltage amplifier circuit (4) also comprises enlargement factor for being arranged on described second amplifier (11) to regulate the 4th resistance (13) and the 5th resistance (14) of the output voltage of described second amplifier (11).
8. a Switching Power Supply, is characterized in that, comprises the voltage peak pick-up unit according to any one of claim 1 to 7.
9. Switching Power Supply according to claim 8, it is characterized in that, described Switching Power Supply is inverse-excitation type switch power-supply or step-up switching power supply or adjusting and voltage-reduction switch power supply or buck-boost switching power or positive activation type Switching Power Supply or SEPIC Switching Power Supply or ZETA Switching Power Supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520540521.6U CN204925234U (en) | 2015-07-22 | 2015-07-22 | Switching power supply and voltage peak detection device thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520540521.6U CN204925234U (en) | 2015-07-22 | 2015-07-22 | Switching power supply and voltage peak detection device thereof |
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| CN204925234U true CN204925234U (en) | 2015-12-30 |
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| CN201520540521.6U Expired - Fee Related CN204925234U (en) | 2015-07-22 | 2015-07-22 | Switching power supply and voltage peak detection device thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158550A (en) * | 2015-07-22 | 2015-12-16 | 珠海格力电器股份有限公司 | Switching power supply and voltage peak value detecting device and method thereof |
| CN106888006A (en) * | 2017-03-17 | 2017-06-23 | 华自科技股份有限公司 | Signal peak detection means |
| CN107528454A (en) * | 2017-09-30 | 2017-12-29 | 郑州云海信息技术有限公司 | A kind of Mosfet state monitoring apparatus |
| CN108663566A (en) * | 2017-04-01 | 2018-10-16 | 佛山市顺德区美的电热电器制造有限公司 | The detection device and method of the resonance potential of electromagnetic induction |
-
2015
- 2015-07-22 CN CN201520540521.6U patent/CN204925234U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158550A (en) * | 2015-07-22 | 2015-12-16 | 珠海格力电器股份有限公司 | Switching power supply and voltage peak value detecting device and method thereof |
| CN106888006A (en) * | 2017-03-17 | 2017-06-23 | 华自科技股份有限公司 | Signal peak detection means |
| CN106888006B (en) * | 2017-03-17 | 2020-11-03 | 华自科技股份有限公司 | Signal peak value detection device |
| CN108663566A (en) * | 2017-04-01 | 2018-10-16 | 佛山市顺德区美的电热电器制造有限公司 | The detection device and method of the resonance potential of electromagnetic induction |
| CN108663566B (en) * | 2017-04-01 | 2020-12-08 | 佛山市顺德区美的电热电器制造有限公司 | Detection device and method for electromagnetic induction resonance voltage |
| CN107528454A (en) * | 2017-09-30 | 2017-12-29 | 郑州云海信息技术有限公司 | A kind of Mosfet state monitoring apparatus |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151230 Termination date: 20210722 |
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| CF01 | Termination of patent right due to non-payment of annual fee |