CN210898944U - Driving power supply circuit - Google Patents
Driving power supply circuit Download PDFInfo
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- CN210898944U CN210898944U CN201921522300.0U CN201921522300U CN210898944U CN 210898944 U CN210898944 U CN 210898944U CN 201921522300 U CN201921522300 U CN 201921522300U CN 210898944 U CN210898944 U CN 210898944U
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Abstract
The utility model relates to a drive power supply circuit. The circuit comprises a transformer, a primary winding is connected with a high-frequency pulse driving circuit and comprises at least two secondary windings, and each secondary winding is connected with an independent rectifying circuit: the positive electrode taps are connected with the positive electrode output end sequentially through the positive electrode charging and discharging capacitor, the positive electrode rectifier diode and the positive electrode current limiting resistor; a negative tap, which is connected with the negative output end through a negative charging and discharging capacitor, a negative rectifier diode and a negative current limiting resistor in sequence; the grounding tap is directly connected with a grounding end through a ground wire; and a positive filter capacitor is arranged between the connection point of the positive rectifier diode and the positive current-limiting resistor and the ground wire, and a negative filter capacitor is arranged between the connection point of the negative rectifier diode and the negative current-limiting resistor and the ground wire. The circuit design enables the positive voltage and the negative voltage output by the transformer to be determined by the turn ratio of the transformer, and when the turn ratio of the transformer is fixed, the output voltage of the transformer is almost fixed, so that the driving reliability is improved.
Description
Technical Field
The utility model relates to a drive power supply circuit belongs to power supply circuit technical field.
Background
With the development of power electronic technology, a charger is also rapidly developed, and topological circuit structures such as a full-bridge phase-shift converter, an LLC resonant converter and a three-phase vienna circuit are widely applied, but power tubes in the topological circuit structures need driving circuits, power sources of driving signals needed by upper and lower power tubes of the same bridge arm are isolated from each other, otherwise, difference of power source reference points is caused, and therefore, a large number of mutually isolated driving power sources are needed in the charger.
Meanwhile, with the research of the bidirectional isolation charger, the bridge arm of the switching tube of the bidirectional isolation charger is increased, and in addition, with the increase of the power requirement of a single machine, the staggered parallel technology is widely applied, so that the bridge arm of the switching tube is also increased. The increase of the bridge arm of the switching tube inevitably causes the increase of the isolated driving power supply, and for this reason, a circuit for multi-path isolated output is proposed, for example: the utility model discloses a chinese utility model patent document with grant publication number CN 204046407U, this patent document discloses a multi-level IGBT drive circuit, this drive circuit only needs single power input, two way independent PWM drive signal input just can accomplish to carry out the malleation drive to the IGBT of not being in common ground and switch on, the function that the negative pressure drive was turn-off, but including two taps in this drive circuit transformer's the secondary side output coil, connect output positive pole, output negative pole respectively, the ground wire is then connected between two filter capacitors, this circuit is after long-time operation, if electric capacity and resistance self parameter change, especially the capacitance device, its electrolyte can reduce along with the increase of live time, the electric capacity can obviously change, can lead to the condition that circuit output voltage and design value deviation are too big or even became invalid, lead to the drive circuit poor reliability.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a drive power supply circuit for solve the poor problem of current drive circuit reliability.
In order to achieve the above object, the present invention provides a driving power supply circuit, including:
the primary winding of the transformer is connected with the high-frequency pulse driving circuit, and the transformer comprises at least two secondary windings; each secondary winding is connected with an independent rectifying circuit;
each secondary winding and the rectifying circuit thereof respectively comprise a positive electrode tap, a negative electrode tap and a grounding tap which are respectively used for connecting a positive electrode output end, a negative electrode output end and a grounding end;
the positive tap is connected with the positive output end through a positive charging and discharging capacitor, a positive rectifying diode and a positive current limiting resistor in sequence; the negative tap is connected with the negative output end through a negative charging and discharging capacitor, a negative rectifier diode and a negative current limiting resistor in sequence; the grounding tap is directly connected with a grounding end through a ground wire; and a positive filter capacitor is arranged between the connection point of the positive rectifier diode and the positive current-limiting resistor and the ground wire, and a negative filter capacitor is arranged between the connection point of the negative rectifier diode and the negative current-limiting resistor and the ground wire.
The beneficial effects are that: the output coil of each secondary winding of the circuit comprises a positive tap, a negative tap and a grounding tap which are respectively connected with a positive output end, a negative output end and a grounding end, so that the positive voltage and the negative voltage output by the transformer are determined by the turn ratio of the transformer, when the turn ratio of the transformer is fixed, the output voltage of the transformer is almost fixed, and the reliability of driving is improved.
Furthermore, in order to improve the driving reliability of the high-frequency pulse driving circuit, the high-frequency pulse driving circuit comprises a push-pull circuit, the output end of the push-pull circuit is connected with the primary winding, and the control end of the push-pull circuit is connected with a PWM signal.
Further, the push-pull circuit comprises a triode Q1 and a triode Q2, the control end of the push-pull circuit is the base electrodes of a triode Q1 and a triode Q2, the output end of the push-pull circuit is the emitter electrodes of a triode Q1 and a triode Q2, the base electrodes of a triode Q1 and a triode Q2 are used for being connected with a GPIO interface of a microprocessor to receive PWM signals, the emitter electrode of the triode Q1 is connected with the emitter electrode of a triode Q2, the collector electrode of the triode Q1 is used for being connected with a direct current signal, the collector electrode of the triode Q2 is grounded, and the emitter electrodes of the triode Q1 and the triode Q2 are connected.
Furthermore, in order to provide energy follow current and release when the potential of the transformer is reversed, an anode follow current diode is arranged between the connection point of the anode charging and discharging capacitor and the anode rectifier diode and the ground wire; and a negative freewheeling diode is arranged between the connection point of the negative charging and discharging capacitor and the negative rectifying diode and the ground wire.
Furthermore, in order to improve the stability of voltage output, an anode voltage stabilizing tube is arranged between the connection point of the anode current limiting resistor and the anode output end and the ground wire, and a cathode voltage stabilizing tube is arranged between the connection point of the cathode current limiting resistor and the cathode output end and the ground wire.
Further, in order to improve the reliability of the driving power circuit, the transformer is an isolation transformer with a magnetic core.
Drawings
Fig. 1 is a schematic circuit diagram of the driving power supply circuit of the present invention.
Detailed Description
Drive power supply circuit embodiment:
the driving power supply circuit provided by the embodiment is shown in fig. 1 and comprises a high-frequency pulse driving circuit, a transformer and a rectifying circuit, wherein a primary winding of the transformer is connected with the high-frequency pulse driving circuit, n secondary windings of the transformer are provided, n is larger than or equal to 2, and each secondary winding is connected with an independent rectifying circuit.
The rectification circuit is used for converting a high-frequency pulse signal into direct current of a positive power supply and a negative power supply through the rectification circuit, and each secondary winding and the rectification circuit thereof respectively comprise a positive electrode tap, a negative electrode tap and a grounding tap which are respectively used for connecting a positive electrode output end, a negative electrode output end and a grounding end;
the positive tap is connected with the positive output end through a positive charging and discharging capacitor, a positive rectifying diode and a positive current limiting resistor in sequence; the negative tap is connected with the negative output end through a negative charging and discharging capacitor, a negative rectifier diode and a negative current limiting resistor in sequence; the grounding tap is directly connected with a grounding end through a ground wire; and a positive filter capacitor is arranged between the connection point of the positive rectifier diode and the positive current-limiting resistor and the ground wire, and a negative filter capacitor is arranged between the connection point of the negative rectifier diode and the negative current-limiting resistor and the ground wire.
In the embodiment, the high-frequency pulse driving circuit is a push-pull circuit, the output end of the push-pull circuit is connected with the primary winding, and the control end of the push-pull circuit is connected with a GPIO (general purpose input/output) interface of a microprocessor MCU (microprogrammed control unit) to receive a high-frequency square wave signal PWM so as to convert a direct-current signal VDD into a high-frequency pulse signal; one GPIO port of the MCU is set as an output port, and high and low levels of high frequency are output, so that a high-frequency square wave signal, namely a PWM signal is formed. The high-frequency square wave signal is convenient to form, the required square wave signal can be obtained only by initializing the GPIO, the program is simple, and the code is few. Of course, the present invention is not limited to the specific form of the high-frequency pulse driving circuit, as long as the high-frequency pulse signal can be output.
In this embodiment, the transformer is with magnetic core isolation transformer T1, certainly, the utility model discloses do not do the restriction to the concrete type and the model of transformer, as long as can realize the function of transformer can.
In the embodiment, in order to provide energy freewheeling and discharging when the potential of the transformer is reversed, an anode freewheeling diode is arranged between the connection point of the anode charging and discharging capacitor and the anode rectifying diode and the ground wire; and a negative freewheeling diode is arranged between the connection point of the negative charging and discharging capacitor and the negative rectifying diode and the ground wire. In another embodiment, the free wheel diode may not be provided.
In this embodiment, in order to improve the stability of voltage output, an anode voltage regulator tube is disposed between the connection point of the anode current-limiting resistor and the anode output end and the ground line, and a cathode voltage regulator tube is disposed between the connection point of the cathode current-limiting resistor and the cathode output end and the ground line. As another embodiment, the voltage regulator tube may not be provided under the condition of ensuring the voltage stability; or protected with other types of protection circuits.
Specifically, the tap numbers of the first secondary winding are 1, 2, and 3, the tap numbers of the second secondary winding are 4, 5, 6, and … …, the tap numbers of the nth secondary winding are 3n-2, 3n-1, and 3n, according to the position of the tap on the secondary winding, the tap numbers are 3, 6, … …, and 3n from top to bottom, the middle tap is 2, 5, … …, and 3n-1, the lower tap is 1, 4, … …, and 3n-2, the positive output terminal is + VCC11, + VCC21, … …, + VCCn1, the negative output terminal is-VCC 11, -VCC21, … …, -VCCn1, the ground terminal is GND11, 21, … …, and GNDn1, in this embodiment, the middle tap is a ground tap, the upper tap is a positive tap, the lower tap is a negative tap, and as other embodiments, the tap types corresponding to each tap are not limited, as long as the turn ratio is fixed.
Taking the ith secondary winding as an example, the connection relationship between the rectifier circuit and the ith secondary winding is described in detail, and the connection relationship includes:
an anode charging and discharging capacitor Ci1, an anode filter capacitor Ci2, an anode rectifying diode Di1, an anode freewheeling diode Di2, an anode current-limiting resistor Ri1 and an anode voltage-regulator tube Zi1, one end of an anode charging and discharging capacitor Ci1 is connected with an anode tap, the other end of the anode charging and discharging capacitor Ci1 is connected with the anode of an anode rectifying diode Di1, the cathode of an anode rectifying diode Di1 is connected with one end of an anode current-limiting resistor Ri1, the other end of the anode current-limiting resistor Ri1 is used for being connected with the anode output end, the cathode of an anode freewheeling diode Di2 is connected with the connection point of an anode charging and discharging capacitor Ci1 and the anode rectifying diode Di1, the anode of an anode freewheeling diode Di2 is connected with a ground wire, one end of an anode filter capacitor Ci2 is connected with the connection point of an anode rectifying diode Di1 and the anode current-limiting resistor Ri1, the other end of an anode filter capacitor Ci2 is connected with the ground wire, the anode of an anode voltage regulator Zi 38;
a negative electrode charging and discharging capacitor Ci3, a negative electrode filter capacitor Ci4, a negative electrode rectifying diode Di3, a negative electrode freewheeling diode Di4, a negative electrode current limiting resistor Ri2 and a negative electrode voltage stabilizing tube Zi2, one end of the negative electrode charging and discharging capacitor Ci3 is connected with a negative electrode tap, the other end of the negative electrode charging and discharging capacitor Ci3 is connected with the cathode of a negative electrode rectifying diode Di3, the anode of the negative electrode rectifying diode Di3 is connected with one end of a negative electrode current-limiting resistor Ri2, the other end of the negative electrode current-limiting resistor Ri2 is used for being connected with the negative electrode output end, the anode of the negative electrode freewheeling diode Di4 is connected with the connection point of the negative electrode charging and discharging capacitor Ci3 and the negative electrode rectifying diode Di3, the cathode of the negative electrode freewheeling diode Di4 is connected with the ground wire, one end of the negative electrode filtering capacitor Ci4 is connected with the connection point of the negative electrode rectifying diode Di3 and the negative electrode current-limiting resistor Ri.
Specifically, the push-pull circuit comprises a triode Q1 and a triode Q2, the control end of the push-pull circuit is the bases of a triode Q1 and a triode Q2, the output end of the push-pull circuit is the emitters of a triode Q1 and a triode Q2, the bases of a triode Q1 and a triode Q2 are connected with a GPIO interface of the microprocessor through a resistor R1, the emitter of a triode Q1 is connected with the emitter of a triode Q2, the collector of a triode Q1 is used for connecting a direct current signal, the collector of a triode Q2 is grounded, a primary winding and a charging and discharging capacitor C2 which are the same as a magnetic core isolation transformer T1 are connected in series between the connection position of the emitter of a triode Q1 and the emitter of a triode Q2 and the ground, and a capacitor C1 and a resistor R2 are connected in parallel between the bases of. The triode Q1 and the triode Q2 are high-power tubes, the more the number of secondary windings is, the larger the power requirement is, the larger the power of the power tube is selected, and meanwhile, the power consumption and the heat dissipation requirements of the power tube are required to be met.
The working process of the circuit is as follows: the high-frequency square wave signal PWM charges a charging and discharging capacitor C2 by direct current VDD through an NPN type triode Q1, and discharges a charging and discharging capacitor C2 through a PNP type triode Q2, so that a high-frequency pulse signal exists in a primary winding of a same magnetic core isolation transformer T1, the high-frequency pulse signal is transmitted to a winding of a secondary side through the same magnetic core transformer T1, and the high-frequency pulse signal is charged and discharged to positive charging and discharging capacitors C11, C21, … … and Cn1 and negative charging and discharging capacitors C13, C23, … … and Cn3 in a winding of the secondary side, and then the high-frequency pulse signal of the primary side is transferred to the secondary side through the same magnetic core isolation transformer T1, and then forms positive voltage + VCC11, + VCC21, … …, + Cn VC 1 of a direct current power supply and negative voltage-VCC 11, -VCC21, … … and-VCn 1 of the direct current power. At this point, the square wave drive signal is converted into multi-path output and mutually isolated positive and negative direct currents.
As can be seen from the components used in the circuit principle, the components share the GPIO port of the MCU, the push-pull circuit, the primary side coupling charging and discharging capacitor (C2) and the primary side winding of the transformer with the same magnetic core. According to the requirement of the number of output power circuits, only the components on the secondary side of the transformer need to be added. Therefore, the multi-path isolation output driving power circuit has more shared circuits, and the hardware cost is lower under the condition that the number of paths of the output isolation power is more.
Claims (6)
1. A driving power supply circuit is characterized by comprising
The primary winding of the transformer is connected with the high-frequency pulse driving circuit, and the transformer comprises at least two secondary windings; each secondary winding is connected with an independent rectifying circuit;
each secondary winding and the rectifying circuit thereof respectively comprise a positive electrode tap, a negative electrode tap and a grounding tap which are respectively used for connecting a positive electrode output end, a negative electrode output end and a grounding end; the positive tap is connected with the positive output end through a positive charging and discharging capacitor, a positive rectifying diode and a positive current limiting resistor in sequence; the negative tap is connected with the negative output end through a negative charging and discharging capacitor, a negative rectifier diode and a negative current limiting resistor in sequence; the grounding tap is directly connected with a grounding end through a ground wire; and a positive filter capacitor is arranged between the connection point of the positive rectifier diode and the positive current-limiting resistor and the ground wire, and a negative filter capacitor is arranged between the connection point of the negative rectifier diode and the negative current-limiting resistor and the ground wire.
2. The driving power supply circuit according to claim 1, wherein the high frequency pulse driving circuit comprises a push-pull circuit, an output terminal of the push-pull circuit is connected to the primary winding, and a control terminal of the push-pull circuit is connected to the PWM signal.
3. The driving power supply circuit according to claim 2, wherein the push-pull circuit comprises a transistor Q1 and a transistor Q2, the control terminals of the push-pull circuit are bases of a transistor Q1 and a transistor Q2, the output terminals of the push-pull circuit are emitters of a transistor Q1 and a transistor Q2, bases of a transistor Q1 and a transistor Q2 are used for connecting a GPIO interface of the microprocessor to receive the PWM signal, an emitter of a transistor Q1 is connected with an emitter of a transistor Q2, a collector of the transistor Q1 is used for connecting a direct current signal, a collector of the transistor Q2 is grounded, and emitters of the transistor Q1 and the transistor Q2 are connected with the primary winding.
4. The drive power supply circuit according to claim 1, 2 or 3, wherein a positive freewheeling diode is provided between a connection point of the positive charging and discharging capacitor and the positive rectifying diode and the ground; and a negative freewheeling diode is arranged between the connection point of the negative charging and discharging capacitor and the negative rectifying diode and the ground wire.
5. The driving power supply circuit according to claim 1, 2 or 3, wherein a positive voltage regulator tube is arranged between a connection point of the positive current-limiting resistor and the positive output end and a ground wire, and a negative voltage regulator tube is arranged between a connection point of the negative current-limiting resistor and the negative output end and the ground wire.
6. The drive power supply circuit according to claim 1 or 2, wherein the transformer is a same core isolation transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921522300.0U CN210898944U (en) | 2019-09-12 | 2019-09-12 | Driving power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921522300.0U CN210898944U (en) | 2019-09-12 | 2019-09-12 | Driving power supply circuit |
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| Publication Number | Publication Date |
|---|---|
| CN210898944U true CN210898944U (en) | 2020-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921522300.0U Active CN210898944U (en) | 2019-09-12 | 2019-09-12 | Driving power supply circuit |
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|---|---|
| CN (1) | CN210898944U (en) |
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2019
- 2019-09-12 CN CN201921522300.0U patent/CN210898944U/en active Active
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