CN211296554U - Auxiliary source starting circuit - Google Patents
Auxiliary source starting circuit Download PDFInfo
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- CN211296554U CN211296554U CN202020150284.3U CN202020150284U CN211296554U CN 211296554 U CN211296554 U CN 211296554U CN 202020150284 U CN202020150284 U CN 202020150284U CN 211296554 U CN211296554 U CN 211296554U
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Abstract
The utility model relates to an auxiliary source starting circuit technical field, in particular to auxiliary source starting circuit, including sharp generating line, start switching circuit, drive protection circuit, transformer circuit and control chip, drive protection circuit respectively with direct current generating line, start switching circuit and transformer circuit electricity and be connected, control chip is connected with start switching circuit and transformer circuit electricity respectively, compares with prior art, and the auxiliary source starting circuit of this scheme design has reduced the number and the volume of starting resistance greatly, has reduced the loss, has reduced the cost of starting field effect transistor.
Description
Technical Field
The utility model relates to an auxiliary source starting circuit technical field, in particular to auxiliary source starting circuit.
Background
The auxiliary source starting circuits of many existing power electronic conversion devices are directly hung on a direct current bus through resistors to provide starting current for a control chip, such as UCX84X series, NCP1380 and the like, after the auxiliary source starting is completed, the resistors are always hung on the bus, large loss is generated, and meanwhile, the resistor is large in size and occupies a large PCB space. The higher the voltage of the direct current bus is, the more the starting resistance is, the larger the loss is, such as 1500V photovoltaic inverter, energy storage converter, 1000V photovoltaic inverter, energy storage converter, etc., and if the starting resistance is directly connected with the bus, the above problem is more serious.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to solve the technical problems that: provided is an auxiliary source starting circuit capable of reducing loss.
In order to solve the technical problem, the utility model discloses a technical scheme be:
an auxiliary source starting circuit comprises a linear bus, a starting switching circuit, a driving protection circuit, a transformer circuit and a control chip, wherein the driving protection circuit is respectively and electrically connected with the direct current bus, the starting switching circuit and the transformer circuit, and the control chip is respectively and electrically connected with the starting switching circuit and the transformer circuit;
the drive protection circuit comprises a resistor R92, a resistor R97, a resistor R98, a resistor R267, a resistor R268, a resistor R269, a resistor R271, a diode ZD16, a diode ZD17 and a field effect transistor Q15, wherein the drain of the field effect transistor Q15 is electrically connected with one end of the resistor R98 and one end of the resistor R267 respectively, the other end of the resistor R98 is electrically connected with one end of the resistor R97, the other end of the resistor R97 is electrically connected with one end of the resistor R92, the other end of the resistor R92 is electrically connected with a direct current bus, the other end of the resistor R267 is electrically connected with one end of the resistor R268, the other end of the resistor R268 is electrically connected with one end of the resistor R269, the other end of the resistor R269 is electrically connected with one end of the resistor R271, the other end of the resistor R271 is electrically connected with a start switching circuit, the cathode of the diode ZD17 and the gate of the field effect transistor Q15 respectively, the cathode of the diode ZD16 is electrically connected to the source of the field effect transistor Q15 and the transformer circuit, respectively.
Further, the diode ZD16 and the diode ZD17 are both voltage regulators.
Further, the starting switching circuit comprises a resistor R278, a resistor R275 and a triode Q40, the base of the triode Q40 is electrically connected with one end of the resistor R278 and one end of the resistor R275 respectively, the other end of the resistor R278 is electrically connected with the control chip, the other end of the resistor R275 is electrically connected with the emitter of the triode Q40, the other end of the resistor R275 and the emitter of the triode Q40 are both grounded, and the collector of the triode Q40 is electrically connected with the driving protection circuit.
Further, the transformer circuit includes a transformer T1, a diode D22, a capacitor C1 and an electrolytic capacitor CE1, a cathode of the diode D22 is electrically connected to one end of a resistor R82, the other end of the resistor R82 is electrically connected to one end of the driving protection circuit and one end of the electrolytic capacitor CE1, the other end of the electrolytic capacitor CE1 is grounded, an anode of the diode D22 is electrically connected to one end of an auxiliary winding of the transformer T1, the other end of the auxiliary winding of the transformer T1 is electrically connected to one end of the capacitor C1, the other end of the auxiliary winding of the transformer T1 and one end of the capacitor C1 are both grounded, and the other end of the capacitor C1 is grounded.
Further, the model of the control chip is UCX 84X.
The beneficial effects of the utility model reside in that:
the direct current bus provides driving voltage for a field effect transistor Q15 through a circuit consisting of a resistor R92, a resistor R97, a resistor R98, a resistor R267, a resistor R268, a resistor R269, a resistor R271, a diode ZD1 and a diode ZD16, the field effect transistor Q15 is conducted, the direct current bus provides starting current for a control chip through the resistor R92, the resistor R97, the resistor R98 and the field effect transistor Q15, an auxiliary source is started, after the auxiliary source is started, voltage generated by a transformer circuit provides stable working current for the control chip, the control chip works normally, the driving voltage of the field effect transistor Q15 is pulled down, the field effect transistor Q15 is turned off, the resistor R92, the resistor R97 and the resistor R98 (which are starting resistors) are cut off, the starting resistors (the resistor R92, the resistor R97 and the resistor R98) and a bypass resistor (the resistor R267, the resistor R268, the resistor R269 and the resistor R271) form a direct current bus-dividing circuit of the direct current bus, the fet Q15 will experience a lower withstand voltage; compared with the prior art, the auxiliary source starting circuit designed by the scheme greatly reduces the number and the volume of starting resistors, reduces the loss and reduces the cost for starting the field effect transistor.
Drawings
Fig. 1 is an overall circuit block diagram of an auxiliary power supply starting circuit according to the present invention;
fig. 2 is a schematic diagram illustrating an exemplary embodiment of an auxiliary power supply starting circuit according to the present invention;
description of reference numerals:
1. a direct current bus; 2. starting a switching circuit; 3. a drive protection circuit; 4. a transformer circuit; 5. and a control chip.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1, the technical solution provided by the present invention is:
an auxiliary source starting circuit comprises a linear bus, a starting switching circuit, a driving protection circuit, a transformer circuit and a control chip, wherein the driving protection circuit is respectively and electrically connected with the direct current bus, the starting switching circuit and the transformer circuit, and the control chip is respectively and electrically connected with the starting switching circuit and the transformer circuit;
the drive protection circuit comprises a resistor R92, a resistor R97, a resistor R98, a resistor R267, a resistor R268, a resistor R269, a resistor R271, a diode ZD16, a diode ZD17 and a field effect transistor Q15, wherein the drain of the field effect transistor Q15 is electrically connected with one end of the resistor R98 and one end of the resistor R267 respectively, the other end of the resistor R98 is electrically connected with one end of the resistor R97, the other end of the resistor R97 is electrically connected with one end of the resistor R92, the other end of the resistor R92 is electrically connected with a direct current bus, the other end of the resistor R267 is electrically connected with one end of the resistor R268, the other end of the resistor R268 is electrically connected with one end of the resistor R269, the other end of the resistor R269 is electrically connected with one end of the resistor R271, the other end of the resistor R271 is electrically connected with a start switching circuit, the cathode of the diode ZD17 and the gate of the field effect transistor Q15 respectively, the cathode of the diode ZD16 is electrically connected to the source of the field effect transistor Q15 and the transformer circuit, respectively.
From the above description, the beneficial effects of the present invention are:
the direct current bus provides driving voltage for a field effect transistor Q15 through a circuit consisting of a resistor R92, a resistor R97, a resistor R98, a resistor R267, a resistor R268, a resistor R269, a resistor R271, a diode ZD1 and a diode ZD16, the field effect transistor Q15 is conducted, the direct current bus provides starting current for a control chip through the resistor R92, the resistor R97, the resistor R98 and the field effect transistor Q15, an auxiliary source is started, after the auxiliary source is started, voltage generated by a transformer circuit provides stable working current for the control chip, the control chip works normally, the driving voltage of the field effect transistor Q15 is pulled down, the field effect transistor Q15 is turned off, the resistor R92, the resistor R97 and the resistor R98 (which are starting resistors) are cut off, the starting resistors (the resistor R92, the resistor R97 and the resistor R98) and a bypass resistor (the resistor R267, the resistor R268, the resistor R269 and the resistor R271) form a direct current bus-dividing circuit of the direct current bus, the fet Q15 will experience a lower withstand voltage; compared with the prior art, the auxiliary source starting circuit designed by the scheme greatly reduces the number and the volume of starting resistors, reduces the loss and reduces the cost for starting the field effect transistor.
Further, the diode ZD16 and the diode ZD17 are both voltage regulators.
Further, the starting switching circuit comprises a resistor R278, a resistor R275 and a triode Q40, the base of the triode Q40 is electrically connected with one end of the resistor R278 and one end of the resistor R275 respectively, the other end of the resistor R278 is electrically connected with the control chip, the other end of the resistor R275 is electrically connected with the emitter of the triode Q40, the other end of the resistor R275 and the emitter of the triode Q40 are both grounded, and the collector of the triode Q40 is electrically connected with the driving protection circuit.
As can be seen from the above description, by providing the start-up switching circuit, the switching information is transmitted to the drive protection circuit to control the turn-off of the fet Q15 after the start-up of the auxiliary source is completed.
Further, the transformer circuit includes a transformer T1, a diode D22, a capacitor C1 and an electrolytic capacitor CE1, a cathode of the diode D22 is electrically connected to one end of a resistor R82, the other end of the resistor R82 is electrically connected to one end of the driving protection circuit and one end of the electrolytic capacitor CE1, the other end of the electrolytic capacitor CE1 is grounded, an anode of the diode D22 is electrically connected to one end of an auxiliary winding of the transformer T1, the other end of the auxiliary winding of the transformer T1 is electrically connected to one end of the capacitor C1, the other end of the auxiliary winding of the transformer T1 and one end of the capacitor C1 are both grounded, and the other end of the capacitor C1 is grounded.
As can be seen from the above description, the diode D22 is a rectifier diode, which rectifies the pulse voltage generated by the transformer T1 into a dc voltage, the resistor R82 is a voltage dividing resistor, the capacitor C1 is an ampere-capacitor Y, which reduces the influence of the common mode current on the output, and the electrolytic capacitor CEl plays a role of filtering, so as to filter the dc voltage generated by the transformer T1 more smoothly.
Further, the model of the control chip is UCX 84X.
Referring to fig. 1 and fig. 2, a first embodiment of the present invention is:
referring to fig. 1, an auxiliary power supply starting circuit includes a linear bus, a starting switching circuit 2, a driving protection circuit 3, a transformer circuit 4 and a control chip 5, where the driving protection circuit 3 is electrically connected to the direct current bus 1, the starting switching circuit 2 and the transformer circuit 4, respectively, and the control chip 5 is electrically connected to the starting switching circuit 2 and the transformer circuit 4, respectively;
referring to fig. 2, the driving protection circuit 3 includes a resistor R92 (with a resistance of 51K Ω), a resistor R97 (with a resistance of 100K Ω), a resistor R98 (with a resistance of 100K Ω), a resistor R267 (with a resistance of 100K Ω), a resistor R268 (with a resistance of 100K Ω), a resistor R269 (with a resistance of 100K Ω), a resistor R271 (with a resistance of 100K Ω), a diode ZD16 (with a model of GLZ15B), a diode ZD17 (with a model of GLZ15B), and a field-effect transistor Q15 (with a model of 2N60L-TA3-T), a drain of the field-effect transistor Q15 is electrically connected to one end of the resistor R98 and one end of the resistor R267, the other end of the resistor R98 is electrically connected to one end of the resistor R97, the other end of the resistor R97 is electrically connected to one end of the resistor R92, the other end of the resistor R92 is electrically connected to the dc bus 1, and the other end of the resistor, the other end of the resistor R268 is electrically connected with one end of the resistor R269, the other end of the resistor R269 is electrically connected with one end of the resistor R271, the other end of the resistor R271 is electrically connected with the start switching circuit 2, the cathode of the diode ZD17 and the gate of the field effect transistor Q15 respectively, the anode of the diode ZD17 is electrically connected with the anode of the diode ZD16, and the cathode of the diode ZD16 is electrically connected with the source of the field effect transistor Q15 and the transformer circuit 4 respectively.
The diode ZD16 and the diode ZD17 are both voltage regulator tubes.
The start switch circuit 2 includes resistance R278 (the resistance value is 4.12K omega), resistance R275 (the resistance value is 1.2K omega) and triode Q40 (the model is MMBT4401), triode Q40's base is connected with resistance R278's one end and resistance R275's one end electricity respectively, resistance R278's the other end is connected with control chip 5 electricity, resistance R275's the other end is connected with triode Q40's projecting pole electricity and resistance R275's the other end and triode Q40's projecting pole all ground connection, triode Q40's collecting electrode is connected with drive protection circuit 3 electricity.
The transformer circuit 4 includes a transformer T1 (the transformer T1 adopts an EE35 type high frequency transformer, the inductance value is 0.82mH), a diode D22 (the model is US1M-E3/61T), a capacitor C1 (the capacitance value is 0.022uF), and an electrolytic capacitor CE1 (the capacitance value is 100uF), a cathode of the diode D22 is electrically connected with one end of a resistor R82, the other end of the resistor R82 is electrically connected with one end of the driving protection circuit 3 and one end of an electrolytic capacitor CE1, the other end of the electrolytic capacitor CE1 is grounded, an anode of the diode D22 is electrically connected with one end of an auxiliary winding of the transformer T1, the other end of the auxiliary winding of the transformer T1 is electrically connected with one end of a capacitor C1, the other end of the auxiliary winding of the transformer T1 and one end of a capacitor C1 are both grounded, and the other end of the capacitor C1 is.
The model of the control chip 5 is UCX 84X.
The working principle of the auxiliary source starting circuit is as follows:
the starting resistor (the resistor R92, the resistor R97 and the resistor R98) is hung on the direct current BUS 1AUX _ BUS + of the auxiliary source, the field effect transistor Q15 is conducted during starting, starting current is provided for the control chip 5, and the auxiliary source (namely the auxiliary power supply) is started; after the start is finished, the voltage VCC _ Trans generated by the auxiliary winding of the transformer circuit 4 is established, the reference voltage Vref generated by the control chip 5 is established, the triode Q40 is conducted, the field effect transistor Q15 is turned off, the start resistor does not generate loss, and the start resistor with smaller volume can be used due to short start time; after the field effect transistor Q15 is turned off, a voltage division circuit formed by dividing the voltage of the direct current BUS 1AUX _ BUS + by a bypass resistor (a resistor R267, a resistor R268, a resistor R269 and a resistor R271) and a starting resistor (a resistor R92, a resistor R97 and a resistor R98) is adopted, the voltage borne by the bypass resistor (the resistor R267, the resistor R268, the resistor R269 and the resistor R271) is the withstand voltage borne by the field effect transistor Q15, the withstand voltage of the field effect transistor Q15 is reduced, a field effect transistor with low withstand voltage can be selected, and the cost of the field effect transistor is reduced.
When the auxiliary source is started, the Vref pin voltage of the control chip 5 is not established, and the voltage V on the direct current bus 1aux_busThe field effect transistor Q15 is driven to be conducted through the resistor R92, the resistor R97, the resistor R98, the resistor R267, the resistor R268, the resistor R269 and the resistor R271, and the diode ZD17 and the diode ZD16 protect the driving voltage of the field effect transistor from exceeding a threshold value.
After the auxiliary source is started, the voltage VCC _ Trans generated by the auxiliary winding of the transformer T1 of the transformer circuit 4 is established, the UCX84X of the control chip 5 works normally, the reference voltage Vref generated by the control chip 5 is established, the driving voltage of the field-effect tube Q15 is pulled down, the field-effect tube Q15 is turned off, a voltage division circuit consisting of a resistor R92, a resistor R97, a resistor R98, a resistor R267, a resistor R268, a resistor R269 and a resistor R271 is the withstand voltage born by the field-effect tube Q15, and the voltage V of the whole direct current bus 1 is not used for the field-effect tube Q15aux_busA field effect transistor with low voltage resistance can be selected.
To sum up, the utility model provides a pair of auxiliary power source circuit, the direct current generating line is through the circuit that resistance R92, resistance R97, resistance R98, resistance R267, resistance R268, resistance R269, resistance R271, diode ZD1 and diode ZD16 constitute, provide drive voltage for field effect transistor Q15, and protect drive voltage not to exceed the drive threshold, field effect transistor Q15 switches on, the direct current generating line is through resistance R92, resistance R97, resistance R98 and field effect transistor Q15 provide the starting current for the control chip, the auxiliary power source starts, after the auxiliary power source starts, the voltage that the transformer circuit produced provides stable operating current for the control chip, the control chip normal operation, the drive voltage of field effect transistor Q15 is drawn down, field effect transistor Q15 switches off, resistance R92, resistance R97 and resistance R98 (be starting resistance) are cut off, starting resistance (resistance R92, resistance R97 and resistance R98) and bypass resistance (resistance R35267) are cut off, starting resistance (resistance R92, resistance R98) are cut off, Resistor R268, resistor R269 and resistor R271) form a voltage divider circuit for the dc bus, and fet Q15 will experience a lower withstand voltage; compared with the prior art, the auxiliary source starting circuit designed by the scheme greatly reduces the number and the volume of starting resistors, reduces the loss and reduces the cost for starting the field effect transistor.
The above mentioned is only the embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.
Claims (5)
1. The auxiliary source starting circuit is characterized by comprising a linear bus, a starting switching circuit, a driving protection circuit, a transformer circuit and a control chip, wherein the driving protection circuit is respectively and electrically connected with the direct current bus, the starting switching circuit and the transformer circuit, and the control chip is respectively and electrically connected with the starting switching circuit and the transformer circuit;
the drive protection circuit comprises a resistor R92, a resistor R97, a resistor R98, a resistor R267, a resistor R268, a resistor R269, a resistor R271, a diode ZD16, a diode ZD17 and a field effect transistor Q15, wherein the drain of the field effect transistor Q15 is electrically connected with one end of the resistor R98 and one end of the resistor R267 respectively, the other end of the resistor R98 is electrically connected with one end of the resistor R97, the other end of the resistor R97 is electrically connected with one end of the resistor R92, the other end of the resistor R92 is electrically connected with a direct current bus, the other end of the resistor R267 is electrically connected with one end of the resistor R268, the other end of the resistor R268 is electrically connected with one end of the resistor R269, the other end of the resistor R269 is electrically connected with one end of the resistor R271, the other end of the resistor R271 is electrically connected with a start switching circuit, the cathode of the diode ZD17 and the gate of the field effect transistor Q15 respectively, the cathode of the diode ZD16 is electrically connected to the source of the field effect transistor Q15 and the transformer circuit, respectively.
2. The auxiliary power supply starting circuit as claimed in claim 1, wherein the diode ZD16 and the diode ZD17 are both voltage regulators.
3. The auxiliary power supply starting circuit as claimed in claim 1, wherein the starting switching circuit comprises a resistor R278, a resistor R275 and a transistor Q40, a base of the transistor Q40 is electrically connected to one end of the resistor R278 and one end of the resistor R275 respectively, the other end of the resistor R278 is electrically connected to the control chip, the other end of the resistor R275 is electrically connected to an emitter of the transistor Q40, the other end of the resistor R275 and an emitter of the transistor Q40 are both grounded, and a collector of the transistor Q40 is electrically connected to the driving protection circuit.
4. The auxiliary source start circuit as claimed in claim 1, wherein the transformer circuit comprises a transformer T1, a diode D22, a capacitor C1 and an electrolytic capacitor CE1, the cathode of the diode D22 is electrically connected to one end of a resistor R82, the other end of the resistor R82 is electrically connected to one end of the driving protection circuit and one end of the electrolytic capacitor CE1, respectively, the other end of the electrolytic capacitor CE1 is grounded, the anode of the diode D22 is electrically connected to one end of the auxiliary winding of the transformer T1, the other end of the auxiliary winding of the transformer T1 is electrically connected to one end of the capacitor C1, the other end of the auxiliary winding of the transformer T1 and one end of the capacitor C1 are both grounded, and the other end of the capacitor C1 is grounded.
5. The auxiliary power supply starting circuit as claimed in claim 1, wherein the model of the control chip is UCX 84X.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020150284.3U CN211296554U (en) | 2020-02-03 | 2020-02-03 | Auxiliary source starting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020150284.3U CN211296554U (en) | 2020-02-03 | 2020-02-03 | Auxiliary source starting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211296554U true CN211296554U (en) | 2020-08-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020150284.3U Active CN211296554U (en) | 2020-02-03 | 2020-02-03 | Auxiliary source starting circuit |
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|---|---|
| CN (1) | CN211296554U (en) |
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2020
- 2020-02-03 CN CN202020150284.3U patent/CN211296554U/en active Active
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