CN203909133U - Large power high frequency power supply output overvoltage detection circuit - Google Patents
Large power high frequency power supply output overvoltage detection circuit Download PDFInfo
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- CN203909133U CN203909133U CN201420285607.4U CN201420285607U CN203909133U CN 203909133 U CN203909133 U CN 203909133U CN 201420285607 U CN201420285607 U CN 201420285607U CN 203909133 U CN203909133 U CN 203909133U
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Abstract
The utility model discloses a large power high frequency power supply output overvoltage detection circuit. The circuit comprises a voltage dividing sampling circuit, a voltage follower, a filter circuit, a linear optocoupler isolation circuit, an average value circuit, a comparison circuit and a signal shaping circuit. The pulse direct current voltage output by a power supply respectively passes through the voltage dividing sampling circuit, the voltage follower, the filter circuit, the linear optocoupler isolation circuit, the average value circuit, the comparison circuit and the signal shaping circuit, and then an overvoltage detection signal is output. The overvoltage detection signal comprises two levels of reduced power operation and shutdown. According to the utility model, the voltage follower, the filter circuit, the linear optocoupler isolation circuit and the signal shaping circuit are used, which effectively improves the accuracy of a detected signal; and through the overvoltage detection signal with two levels, the reliability of the large power high frequency power supply is effectively improved.
Description
Technical field
The utility model relates to a kind of testing circuit, specifically a kind of high-power high-frequency power supply output overvoltage testing circuit.
Background technology
Along with industrial fast development, traditional power frequency power supply mode can not meet current power requirement.Traditional power frequency power supply art dynamic response is slow, high-pressure side output voltage ripple is large, efficiency is low, energy consumption is large, power factor (PF) is little, grid side harmonic pollution serious, electrical network electricity consumption imbalance, and the shortcomings of this power supply mode has determined that it can be replaced by novel power supply mode gradually.Along with the development of electric power power technology, high frequency power supply mode emerges, and it can improve above-mentioned shortcoming well, improves power-efficient, and increasing power factor realizes energy-conservationly, but high frequency power supply mode also increases with respect to the system complexity of power frequency power supply mode thereupon.High-power high-frequency power supply there will be at any time average to transfinite in operational process; if do not send any signal; high frequency electric source output voltage may further transfinite; cause transformer core to cause turn-to-turn short circuit because bearing too high voltages; burn iron core; if send immediately stoppage protection signal, can reduce the operational use time of high frequency electric source.Therefore the output voltage of high-power high-frequency power supply being carried out to two-stage overvoltage detection has great significance.
Summary of the invention
The purpose of this utility model is to provide a kind of high-power high-frequency power supply output overvoltage testing circuit, the utility model adopts voltage follower, filtering circuit and linear optical coupling buffer circuit effectively to improve the precision of measured signal, has effectively improved the reliability of high-power high-frequency power supply by the overvoltage detection signal of two ranks.
The utility model is achieved through the following technical solutions:
A kind of high-power high-frequency power supply output overvoltage testing circuit, is characterized in that: this circuit comprises the pressure sampling circuit, voltage follower, filtering circuit, linear optical coupling buffer circuit, averaging circuit and the comparator circuit that are linked in sequence successively; Pressure sampling circuit is connected with the output voltage of high frequency electric source; The output voltage process pressure sampling circuit of high frequency electric source obtains the small-signal with output ripple voltage relation in direct ratio; Then involve spike pulse by voltage follower, filtering circuit, the filtering of linear optical coupling buffer circuit are humorous; Obtain again the mean value of sampled signal by averaging circuit; Export downrating and shut down two paths of signals by comparator circuit again; Finally and rising certain by signal transformation circuit output pulse width, the regular square wave that negative edge is precipitous.
In the utility model, pressure sampling circuit collects small voltage signal by divider resistance, and at the unidirectional Transient Suppression Diode of small voltage signal two ends inverse parallel, prevents that high pressure from sealing in late-class circuit.
Linear optical coupling buffer circuit has following function: prevent that front late-class circuit from interfering with each other, particularly prevent that front stage circuits spike pulse from sealing in late-class circuit.
Comparator circuit comprises two comparing units; One of them is used for exporting downrating signal, and another is used for exporting stopping signal.
Signal transformation circuit) formed by the reverse trigger of Schmidt and monostalbe trigger.
The utility model adopts voltage follower, filtering circuit and linear optical coupling buffer circuit effectively to improve the precision of measured signal, has effectively improved the reliability of high-power high-frequency power supply by the overvoltage detection signal of two ranks.
Brief description of the drawings
Fig. 1 is systematic schematic diagram of the present utility model.
Embodiment
A kind of high-power high-frequency power supply output overvoltage testing circuit, is shown in Fig. 1, and this circuit comprises pressure sampling circuit 1, voltage follower 2, filtering circuit 3, linear optical coupling buffer circuit 4, averaging circuit 5, comparator circuit 6 and signal transformation circuit 7.The pulsating volage of high frequency electric source output is converted into small voltage signal by pressure sampling circuit, and this voltage signal is directly proportional to the output voltage of power supply; At the unidirectional Transient Suppression Diode of small voltage signal two ends inverse parallel, prevent that high pressure from sealing in late-class circuit simultaneously.
The small voltage signal of pressure sampling circuit output, late-class circuit before first isolating by voltage follower, prevents that front late-class circuit from interfering with each other; Then by filtering circuit filtering harmonic component; By late-class circuit before the isolation of linear optical coupling buffer circuit, prevent that front late-class circuit from interfering with each other again, particularly front stage circuits spike pulse seals in late-class circuit; Obtain again the mean value of sampled signal by averaging circuit; Export downrating and shut down two paths of signals by comparator circuit again, finally and rising certain by signal transformation circuit output pulse width, the regular square wave that negative edge is precipitous.
The utility model adopts voltage follower, filtering circuit, linear optical coupling buffer circuit and signal transformation circuit effectively to improve the precision of measured signal, has effectively improved the reliability of high-power high-frequency power supply by the overvoltage detection signal of two ranks.
Claims (5)
1. a high-power high-frequency power supply output overvoltage testing circuit, is characterized in that: this circuit comprises the pressure sampling circuit (1), voltage follower (2), filtering circuit (3), linear optical coupling buffer circuit (4), averaging circuit (5), comparator circuit (6), the signal transformation circuit (7) that are linked in sequence successively; Pressure sampling circuit (1) is connected with the output voltage of high frequency electric source; The output voltage process pressure sampling circuit (1) of high frequency electric source obtains the small voltage signal with output voltage relation in direct ratio; Then involve spike pulse by voltage follower (2), filtering circuit (3), linear optical coupling buffer circuit (4) filtering are humorous; Obtain again the mean value of sampled signal by averaging circuit (5); Again by comparator circuit (6) output downrating and shut down two paths of signals, finally and rising certain by signal transformation circuit (7) output pulse width, the regular square wave that negative edge is precipitous.
2. high-power high-frequency power supply output overvoltage testing circuit according to claim 1, it is characterized in that: pressure sampling circuit (1) collects small voltage signal by divider resistance, and at the unidirectional Transient Suppression Diode of small voltage signal two ends inverse parallel, prevent that high pressure from sealing in late-class circuit.
3. high-power high-frequency power supply output overvoltage testing circuit according to claim 1, is characterized in that: described linear optical coupling buffer circuit (4) prevents that front late-class circuit from interfering with each other.
4. high-power high-frequency power supply output overvoltage testing circuit according to claim 1, is characterized in that: described comparator circuit (6) comprises two comparing units; One of them is used for exporting downrating signal, and another is used for exporting stopping signal.
5. high-power high-frequency power supply output overvoltage testing circuit according to claim 1, is characterized in that: described signal transformation circuit (7) is made up of the reverse trigger of Schmidt and monostalbe trigger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420285607.4U CN203909133U (en) | 2014-05-30 | 2014-05-30 | Large power high frequency power supply output overvoltage detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420285607.4U CN203909133U (en) | 2014-05-30 | 2014-05-30 | Large power high frequency power supply output overvoltage detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203909133U true CN203909133U (en) | 2014-10-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420285607.4U Expired - Fee Related CN203909133U (en) | 2014-05-30 | 2014-05-30 | Large power high frequency power supply output overvoltage detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203909133U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103969498A (en) * | 2014-05-30 | 2014-08-06 | 江苏容天机电科技有限公司 | High-power high-frequency power supply output overvoltage detection circuit |
-
2014
- 2014-05-30 CN CN201420285607.4U patent/CN203909133U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103969498A (en) * | 2014-05-30 | 2014-08-06 | 江苏容天机电科技有限公司 | High-power high-frequency power supply output overvoltage detection circuit |
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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: 20141029 Termination date: 20190530 |
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| CF01 | Termination of patent right due to non-payment of annual fee |