CN209767882U - flyback charger control circuit - Google Patents
flyback charger control circuit Download PDFInfo
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- CN209767882U CN209767882U CN201822006432.XU CN201822006432U CN209767882U CN 209767882 U CN209767882 U CN 209767882U CN 201822006432 U CN201822006432 U CN 201822006432U CN 209767882 U CN209767882 U CN 209767882U
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Abstract
The utility model provides a flyback charger control circuit, including power input end, rectifier filter circuit, PWM produce circuit, transformer, diode subassembly, energy storage capacitor, current feedback circuit, control chip, charging switch circuit and power output end, power input end and rectifier filter circuit electric connection, rectifier filter circuit and PWM produce the circuit and be connected with the primary coil of transformer respectively, control chip and charging switch circuit electric connection, and charging switch circuit is connected with power output end. The flyback charger control circuit is simple in circuit design, the transformer enables the power input end and the power output end to be isolated, and the anti-interference capability to the outside is strong; the alternating current is converted into direct current through the rectifying and filtering circuit, the PWM generating circuit and the transformer, then the control chip and the charging switch circuit are adopted to directly supply power to the load, the direct current with the same power supplies power to the load than the alternating current, and the direct current can supply power to more loads, so that power saving is realized.
Description
Technical Field
The utility model relates to a street lamp power supply control technical field specifically relates to a flyback charger control circuit.
Background
The existing street lamp is directly supplied by alternating current, and the power distribution mode of a power supply of the street lamp comprises the following modes of single power supply power distribution and multi-power supply power distribution, wherein an interface of a power line of the power supply power distribution is connected with a power supply junction box of the existing set of street lamp poles; generally, how many street lamps are connected to one distribution box depends on the capacity of a power supply system of the distribution box.
in the prior art, the distribution line of the street lamp generally uses 6mm2-10mm2The cable of (1) can only be used for a street lamp with 10-25 kilowatts when a single power supply is used for power distribution; if the power supply is divided into three phases, the power supply is about 30-75 kilowatts.
At present, alternating current is used for supplying power to a street lamp, and the alternating current needs to be buried in the installation process of the street lamp, so that the alternating current leakage or electric quantity leakage is prevented from harming the public, and the construction is troublesome.
Therefore, it is desirable to provide a flyback charger control circuit to solve the deficiencies in the prior art.
SUMMERY OF THE UTILITY MODEL
In order to overcome prior art's not enough, the utility model provides a flyback charger control circuit, this flyback charger control circuit passes through rectification filter circuit, PWM produces circuit and transformer and adopts control chip and charging switch circuit directly to give the load power supply after turning into the direct current with the alternating current again, be the street lamp power supply promptly, because of the direct current is little than the alternating current consume, the comparison power saving, the construction installation can avoid the alternating current to give the danger that constructor brought, the direct current of the same power gives the load power supply than the alternating current, the direct current can give more load power supplies, realize the power saving, the cost has been saved correspondingly.
The technical scheme of the utility model as follows: a flyback charger control circuit comprises a power input terminal, a rectifying filter circuit, a PWM generating circuit, a transformer, a diode component, an energy storage capacitor, a current feedback circuit, a control chip, a charging switch circuit and a power output terminal, the power input end is electrically connected with the rectifying and filtering circuit, the rectifying and filtering circuit and the PWM generating circuit are respectively connected with the primary coil of the transformer, the secondary coil of the transformer is connected with the diode component, the diode component is connected with the energy storage capacitor, the energy storage capacitor is connected with the power output end, the current feedback circuit is respectively connected with the energy storage capacitor and the PWM generating circuit, the control chip is electrically connected with the charging switch circuit, and the charging switch circuit is respectively connected with the energy storage capacitor and the power supply output end;
The power input end is connected with a mains supply to supply power for the flyback charger control circuit, and the power input end is connected with the primary coil of the transformer through the rectifying and filtering circuit.
The power output end is respectively connected with a rechargeable battery and an electric appliance, and when the commercial power is cut off, the rechargeable battery is used as a standby power supply to supply power for the electric appliance.
The charging switch circuit is used for connecting or disconnecting the secondary coil of the transformer with the power output end. The charging switch circuit comprises a first MOS tube, a second MOS tube, a triode, a first diode and a second diode, wherein the drain electrode of the first MOS tube is connected with the energy storage capacitor, the source electrode of the first MOS tube is connected with the source electrode of the second MOS tube, the grid electrode of the first MOS tube and the grid electrode of the second MOS tube are respectively connected with the collector electrode of the triode, the drain electrode of the second MOS tube is connected with the power output end, the first diode and the second diode are connected in series, the anode of the first diode is connected with the drain electrode of the first MOS tube, the cathode of the second diode is grounded, the anode of the first diode is also connected with the base electrode of the triode, and the emitting electrode of the triode is electrically connected with the control chip.
The rectification filter circuit comprises a first filter, a rectifier bridge and a second filter which are sequentially connected, the first filter is connected with the power input end, and the second filter is connected with the primary coil of the transformer.
The PWM generating circuit is used for transmitting a square wave signal generated by a primary coil of the transformer to a secondary coil of the transformer through electromagnetic induction. The PWM generating circuit comprises a PWM control chip, a gate driver and a third MOS tube, the PWM control chip is connected with the gate driver, the gate driver is connected with a grid electrode of the third MOS tube, a source electrode of the third MOS tube is grounded, and a drain electrode of the third MOS tube is connected with a primary coil of the transformer.
The current feedback circuit is used for transmitting the current output by the secondary coil in the transformer to the PWM generating circuit. The current feedback circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a photoelectric coupler, a voltage stabilizing diode and a first capacitor, one end of the first resistor is connected with the anode of the energy storage capacitor, the other end of the first resistor is connected with the input end of the photoelectric coupler, the cathode of the voltage stabilizing diode is connected with the input end of the electric coupler, the anode of the voltage stabilizing diode is grounded, the output end of the electric coupler is connected with the PWM control chip, one end of the second resistor is connected with the first resistor, the second resistor is connected with the third resistor in series, the other end of the third resistor is grounded, the fourth resistor is connected with the first capacitor in series, the fourth resistor is connected with the voltage stabilizing diode, and the first capacitor is connected with the second resistor and the third resistor.
The voltage output by the second filter is a first voltage through a first voltage reduction chip, the voltage output by the first voltage reduction chip is a second voltage through a second voltage reduction chip, the first voltage supplies power to the gate driver, and the second voltage supplies power to the PWM control chip.
The voltage output by the secondary coil of the transformer is the third voltage through a third voltage reduction chip, the voltage output by the third voltage through a fourth voltage reduction chip is the fourth voltage, and the fourth voltage supplies power for the control chip.
the utility model has the advantages that: the flyback charger control circuit is simple in circuit design, the transformer enables the power input end and the power output end to be isolated, and the anti-interference capability to the outside is strong; in addition, the output end of the power supply is connected with the rechargeable battery, and the rechargeable battery can also supply power to the electronic product to ensure the normal work of the electronic product when the mains supply is powered off, so that convenience is brought to production and life;
The flyback charger control circuit directly supplies power to a load by adopting the control chip and the charging switch circuit after converting alternating current into direct current through the rectifying filter circuit, the PWM generating circuit and the transformer, namely, the street lamp supplies power, the loss of the direct current is less than that of the alternating current, power is saved, the danger brought to constructors by the alternating current can be avoided in construction and installation, the direct current with the same power supplies power to the load than the alternating current, the direct current can supply power to more loads, power saving is realized, and the cost is correspondingly saved.
Description of the drawings:
Fig. 1 is the utility model discloses a flyback charger control circuit.
Reference numerals: the power supply comprises a power supply input end 11, a power supply output end 12, a rectification filter circuit 2, a first filter 21, a rectification bridge 22, a second filter 23, a PWM generating circuit 3, a PWM control chip 31, a gate driver 32, a transformer 4, a diode component 5, an energy storage capacitor 6, a current feedback circuit 7, a control chip 8 and a charging switch circuit 9.
Detailed Description
In order to make the utility model discloses a utility model purpose, technical scheme and technological effect are more clear and are understood, and it is right to combine specific embodiment below the utility model discloses do further explanation. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Referring to fig. 1, a flyback charger control circuit includes a power input terminal 11, a rectifying filter circuit 2, a PWM generating circuit 3, a transformer 4, a diode assembly 5, an energy storage capacitor 6, a current feedback circuit 7, a control chip 8, a charging switch circuit 9, and a power output terminal 12, where the power input terminal 11 is electrically connected to the rectifying filter circuit 2, the rectifying filter circuit 2 and the PWM generating circuit 3 are respectively connected to a primary coil of the transformer 4, a secondary coil of the transformer 4 is connected to the diode assembly 5, the diode assembly 5 is connected to the energy storage capacitor 6, the energy storage capacitor 6 is connected to the power output terminal 12, the current feedback circuit 7 is respectively connected to the energy storage capacitor 6 and the PWM generating circuit 3, the flyback charger control circuit further includes a control chip 8 and a charging switch circuit 9, the control chip 8 is electrically connected with the charging switch 9, and the charging switch 9 is respectively connected with the energy storage capacitor 6 and the power output end 12. The model of the control chip 8 is preferably dspic 33. In this embodiment, the power input end 11 is connected to a commercial power to supply power to the flyback charger control circuit, and the power input end 11 is connected to the primary coil of the transformer 4 through the rectifying and filtering circuit 2. The voltage range of the commercial power is 180V-260V of alternating current.
Referring to fig. 1, the power output end 12 is respectively connected to a rechargeable battery and an electrical appliance, and the rechargeable battery is used as a standby power supply to supply power to the electrical appliance when the commercial power is cut off. Wherein, the rechargeable battery is preferably a lithium battery. In this embodiment, the power output end 12 outputs a 60V/50A direct current, the electrical appliance is an electronic product with a power of more than 3KW, such as a street lamp, and the rechargeable battery and the electrical appliance are respectively connected to the power output end 12, so that the rechargeable battery is electrically connected to the electrical appliance.
Referring to fig. 1, the rectifying and filtering circuit 2 includes a first filter 21, a rectifying bridge 22 and a second filter 23 connected in sequence, the first filter 21 is connected to the power input terminal 11, and the second filter 23 is connected to the primary coil of the transformer 4. In this embodiment, the commercial power input from the power input end passes through the first filter 21, the rectifier bridge 22 and the second filter 23 to output a primary dc power, and the primary dc power is connected to the primary coil of the transformer 4.
Referring to fig. 1, the PWM generating circuit 3 is configured to generate a square wave signal from the primary winding of the transformer 4 and transmit the square wave signal to the secondary winding of the transformer 4 through electromagnetic induction. The PWM generating circuit 3 includes a PWM control chip 31, a gate driver 32 and a third MOS transistor Q3, the PWM control chip 31 is connected to the gate driver 32, the gate driver 32 is connected to the gate of the third MOS transistor, the source of the third MOS transistor Q3 is grounded, and the drain of the third MOS transistor Q3 is connected to the primary winding of the transformer 4. The model of the PWM control chip 31 is preferably LTC6992, and the model of the gate driver 32 is preferably UCC 27519A. In this embodiment, the PWM control chip 31 outputs a square wave signal through the gate driver 32, and the square wave signal is input to the gate of the third MOS transistor Q3 to control the third MOS transistor Q3 to be turned on and off periodically, so that the primary coil of the transformer 4 generates a square wave signal with a large voltage amplitude, and the square wave signal is transmitted to the secondary coil of the transformer 4 through electromagnetic induction.
Referring to fig. 1, the current feedback circuit 7 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a photo coupler OC, a zener diode ZD, and a first capacitor C1, one end of the first resistor R1 is connected to the positive electrode of the energy storage capacitor 6, the other end of the first resistor R1 is connected to the input end of the photo coupler OC, the cathode of the zener diode ZD is connected to the input end of the photo coupler OC, the anode of the zener diode ZD is grounded, the output end of the photo coupler is connected to the PWM control chip 31, one end of the second resistor R2 is connected to the first resistor R1, the second resistor R2 is connected to the third resistor R3 in series, and the other end of the third resistor R3 is grounded. The fourth resistor R4 is connected in series with the first capacitor C1, the fourth resistor R4 is connected with the zener diode ZD, and the first capacitor C1 is connected between the second resistor R2 and the third resistor R3. In this embodiment, the current of the secondary winding of the transformer 4 is transmitted to the PWM control chip 31 in the PWM generating circuit 3 through the optical coupler OC, and the PWM control chip 31 outputs a signal for adjusting the frequency or duty ratio of the third MOS transistor Q3 to ensure that the secondary winding of the transformer 4 can continuously generate a stable voltage to the power output terminal 12.
referring to fig. 1, the charging switch circuit 9 is used to connect or disconnect the secondary winding of the transformer 4 to the power output terminal 12. The charging switch circuit 9 comprises a first MOS transistor Q1, a second MOS transistor Q2, a triode Q4, a first diode D1 and a second diode D2, the drain of the first MOS transistor Q1 is connected with the energy storage capacitor 6, the source of the first MOS transistor Q1 is connected with the source of the second MOS transistor Q2, the grid electrode of the first MOS tube and the grid electrode of the second MOS tube are respectively connected with the collector electrode of the triode, the drain of the second MOS transistor Q2 is connected to the power output terminal 12, the first diode D1 and the second diode D2 are connected in series, the anode of the first diode D1 is connected with the drain of the first MOS transistor Q1, the cathode of the second diode D2 is grounded, the anode of the first diode D1 is also connected to the base of the transistor Q4, and the emitter of the transistor Q4 is connected to the ON/OFF pin of the control chip 8. In this embodiment, when the ON/OFF pin of the control chip 8 outputs a low level signal, the voltage between the base and the emitter of the transistor Q4 is greater than the turn-ON voltage of the transistor Q4, the transistor Q4 is turned ON, since the gate of the first MOS transistor Q1 and the gate of the second MOS transistor Q2 are respectively connected to the collector of the transistor Q4, and the first MOS transistor Q1 and the second MOS transistor Q2 are simultaneously turned ON, so that the circuit between the secondary winding of the transformer 4 and the power output terminal is turned ON, and the power output terminal 12 outputs a 60V/50A dc power to power the rechargeable battery and the electrical appliance. Because the direct current is less than the alternating current loss, the power is relatively saved, the construction and installation can avoid the danger brought by the alternating current to constructors, the direct current with the same power supplies power to the load than the alternating current, the direct current can supply power to more loads, the power is saved, and the cost is correspondingly saved.
Referring to fig. 1, the voltage output by the second filter 23 is a first voltage output by a first buck chip LDO1, the voltage output by the first voltage output by a second buck chip LDO2 is a second voltage, the first voltage supplies power to the gate driver 32, and the second voltage supplies power to the PWM control chip 31. In this embodiment, the first voltage is 15V dc, and the second voltage is 5V dc. The first buck chip LDO1 is preferably 7815, and the second buck chip LDO2 is preferably 78M 05.
Referring to fig. 1, a voltage output from the secondary winding of the transformer 4 through a third buck chip LDO3 is a third voltage, a voltage output from the third voltage through a fourth buck chip LDO4 is a fourth voltage, and the fourth voltage supplies power to the control chip 8. In this embodiment, the third voltage is dc 12V, the fourth voltage is dc 5V, the model of the third buck chip LDO3 is BX8206 preferably, and the model of the fourth buck chip LDO4 is 78M05 preferably.
Referring to fig. 1, the diode assembly 5 is formed by connecting four schottky diodes in parallel, which is beneficial to sharing current and preventing the diode from being burned out due to overlarge current.
The utility model discloses a theory of operation does: the commercial power is input into a power supply from a power supply input end 11, primary direct current is output through the rectifying and filtering circuit 2, the PWM control chip 31 outputs a square wave signal through pulse width modulation to control the closing and the conduction of a third MOS tube, so that a primary coil of the transformer 4 generates a square wave signal with a larger amplitude, the transformer 4 transmits the square wave signal generated by the primary coil of the transformer 4 to a secondary coil of the transformer 4 in an electromagnetic induction mode, one path of output of the secondary coil of the transformer passes through the filtering and rectifying effects of the diode component 5 and the energy storage capacitor 6, and then the control chip 8 controls the connection of the secondary coil of the transformer 4 and the power supply output end 12 through the charging switch circuit 9 so as to output direct current to supply power to a rechargeable battery and; and the other path of output of the secondary coil of the transformer is subjected to voltage reduction by the third voltage reduction chip and the fourth voltage reduction chip and then supplies power to the control chip 8. The isolation between the power input terminal 11 and the power output terminal 12 is achieved by the transformer 4 connection.
The utility model has the advantages that: the flyback charger control circuit directly supplies power to a load by adopting the control chip and the charging switch circuit after converting alternating current into direct current through the rectifying filter circuit, the PWM generating circuit and the transformer, namely, the street lamp supplies power, the loss of the direct current is less than that of the alternating current, power is saved, the danger brought to constructors by the alternating current can be avoided in construction and installation, the direct current with the same power supplies power to the load than the alternating current, the direct current can supply power to more loads, power saving is realized, and the cost is correspondingly saved.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of the ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, its framework form can be nimble changeable, can derive series of products. But merely as a matter of simple deductions or substitutions, should be considered as belonging to the scope of patent protection of the present invention as determined by the claims submitted.
Claims (9)
1. A flyback charger control circuit is characterized by comprising a power input end (11), a rectification filter circuit (2), a PWM generating circuit (3), a transformer (4), a diode component (5), an energy storage capacitor (6), a current feedback circuit (7), a control chip (8), a charging switch circuit (9) and a power output end (12), wherein the power input end (11) is electrically connected with the rectification filter circuit (2), the rectification filter circuit (2) and the PWM generating circuit (3) are respectively connected with a primary coil of the transformer (4), a secondary coil of the transformer (4) is connected with the diode component (5), the diode component (5) is connected with the energy storage capacitor (6), the energy storage capacitor (6) is connected with the power output end (12), the current feedback circuit (7) is respectively connected with the energy storage capacitor (6) and the PWM generating circuit (3), the control chip (8) is electrically connected with the charging switch circuit (9), and the charging switch circuit (9) is respectively connected with the energy storage capacitor (6) and the power output end (12);
The PWM generating circuit (3) is used for transmitting a square wave signal generated by a primary coil of the transformer (4) to a secondary coil of the transformer (4) through electromagnetic induction;
The current feedback circuit (7) is used for transmitting the current output by the secondary coil in the transformer (4) to the PWM generating circuit (3);
the charging switch circuit (9) is used for connecting or disconnecting the secondary coil of the transformer (4) and the power output end (12).
2. The flyback charger control circuit of claim 1, wherein the power input (11) is connected to a mains supply to power the flyback charger control circuit, the power input (11) being connected to the primary winding of the transformer (4) via the rectifying-filtering circuit (2).
3. The flyback charger control circuit of claim 2 wherein the power output (12) is connected to a rechargeable battery and an electrical appliance, respectively, the rechargeable battery serving as a backup power source to power the electrical appliance when the utility power is removed.
4. The flyback charger control circuit of claim 1, wherein the charge switch circuit (9) comprises a first MOS transistor, a second MOS transistor, a triode, a first diode, and a second diode, the drain electrode of the first MOS tube is connected with the energy storage capacitor (6), the source electrode of the first MOS tube is connected with the source electrode of the second MOS tube, the grid electrode of the first MOS tube and the grid electrode of the second MOS tube are respectively connected with the collector electrode of the triode, the drain electrode of the second MOS tube is connected with the power output end (12), the first diode and the second diode are connected in series, the anode of the first diode is connected with the drain of the first MOS tube, the cathode of the second diode is grounded, the anode of the first diode is also connected with the base electrode of the triode, and the emitting electrode of the triode is electrically connected with the control chip (8).
5. The flyback charger control circuit as claimed in claim 1, wherein the rectifier filter circuit (2) comprises a first filter (21), a rectifier bridge (22) and a second filter (23) connected in sequence, the first filter (21) being connected to the power input (11), the second filter (23) being connected to the primary winding of the transformer (4).
6. The flyback charger control circuit of claim 5, wherein the PWM generating circuit (3) comprises a PWM control chip (31), a gate driver (32), and a third MOS transistor, the PWM control chip (31) is connected to the gate driver (32), the gate driver (32) is connected to a gate of the third MOS transistor, a source of the third MOS transistor is grounded, and a drain of the third MOS transistor is connected to the primary coil of the transformer (4).
7. The flyback charger control circuit according to claim 6, wherein the current feedback circuit (7) comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a photocoupler, a zener diode, and a first capacitor, one end of the first resistor is connected to the positive terminal of the energy storage capacitor, the other end of the first resistor is connected to the input terminal of the photocoupler, the cathode of the zener diode is connected to the input terminal of the photocoupler, the anode of the zener diode is grounded, the output terminal of the photocoupler is connected to the PWM control chip, one end of the second resistor is connected to the first resistor, the second resistor is connected to the third resistor in series, the other end of the third resistor is grounded, the fourth resistor is connected to the first capacitor in series, and the fourth resistor is connected to the zener diode, the first capacitor is connected with the second resistor and the third resistor.
8. The flyback charger control circuit of claim 6, wherein the voltage output by the second filter (23) is a first voltage output through a first buck chip (LDO1), and the first voltage is a second voltage output through a second buck chip (LDO2), and the first voltage powers the gate driver (32), and the second voltage powers the PWM control chip (31).
9. The flyback charger control circuit of claim 4, wherein the voltage output from the secondary winding of the transformer (4) is a third voltage through a third buck chip (LDO3), the third voltage is a fourth voltage through a fourth buck chip (LDO4), and the fourth voltage powers the control chip (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822006432.XU CN209767882U (en) | 2018-11-30 | 2018-11-30 | flyback charger control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822006432.XU CN209767882U (en) | 2018-11-30 | 2018-11-30 | flyback charger control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209767882U true CN209767882U (en) | 2019-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822006432.XU Active CN209767882U (en) | 2018-11-30 | 2018-11-30 | flyback charger control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209767882U (en) |
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2018
- 2018-11-30 CN CN201822006432.XU patent/CN209767882U/en active Active
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