CN209948965U - Double-circuit DC-DC converter - Google Patents
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- CN209948965U CN209948965U CN201921178721.6U CN201921178721U CN209948965U CN 209948965 U CN209948965 U CN 209948965U CN 201921178721 U CN201921178721 U CN 201921178721U CN 209948965 U CN209948965 U CN 209948965U
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Abstract
The utility model discloses a double-circuit DC-DC converter, including the DC power supply, filter circuit, isolation transformer and the rectification transform module that connect gradually, and to the feedback control circuit that rectification transform module output carried out the regulation, the rectification transform module includes first rectification filter circuit and second rectification filter circuit, the bootstrap circuit and the voltage feedback circuit that feedback control circuit includes pulse width modulation circuit and is connected with isolation transformer, bootstrap circuit and voltage feedback circuit all are connected with pulse width modulation circuit. The utility model has the advantages of simple structure and reasonable design and components and parts are few, and are small, and the reliability is high, realizes the transform of direct current to direct current, and exports the double-circuit direct current, satisfies dual power supply demand, and the practicality is strong.
Description
Technical Field
The utility model belongs to the technical field of the direct current conversion, concretely relates to double-circuit DC-DC converter.
Background
The DC-DC converter is a voltage converter which effectively outputs a fixed voltage after converting an input voltage, but the current DC-DC converter has some problems:
firstly, the existing DC-DC converter adopts a photoelectric coupler to realize the electric isolation and signal transmission between input and output, and the reliability is lower;
secondly, the existing DC-DC converter has more components, large volume and limited application range.
Therefore, a double-path DC-DC converter with simple structure and reasonable design is lacked at present, magnetic isolation is adopted, the reliability is high, the number of components is small, the size is small, and the application range is improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that not enough among the above-mentioned prior art is directed at, provide a double-circuit DC-DC converter, its simple structure, reasonable in design and components and parts are few, and are small, and the reliability is high, realizes the transform of direct current to direct current, and outputs the double-circuit direct current, satisfies dual power supply demand, and the practicality is strong.
In order to solve the technical problem, the utility model discloses a technical scheme is: a two-way DC-DC converter, characterized by: the direct current power supply, the filter circuit, the isolation transformer and the rectification conversion module which are connected in sequence are included, the feedback adjusting circuit for adjusting the output end of the rectification conversion module is arranged, the rectification conversion module comprises a first rectification filter circuit and a second rectification filter circuit, the feedback adjusting circuit comprises a pulse width modulation circuit, a bootstrap circuit and a voltage feedback circuit, the bootstrap circuit and the voltage feedback circuit are connected with the isolation transformer, and the bootstrap circuit and the voltage feedback circuit are both connected with the pulse width modulation circuit.
The above two-way DC-DC converter is characterized in that: the filter circuit comprises an inductor L1 and a capacitor C1, one end of the inductor L1 is connected with the output end of the direct-current power supply, the other end of the inductor L1 is divided into two paths, one path is grounded through the capacitor C1, and the other path is the output end of the filter circuit.
The above two-way DC-DC converter is characterized in that: the isolation transformer comprises an isolation transformer T1, one end of a primary coil of the isolation transformer T1 is divided into two paths, one path is connected with the output end of the filter circuit, and the other path is connected with one end of a resistor R1; the other end of the primary coil of the isolation transformer T1 is connected with the output end of the pulse width modulation circuit;
the first rectifying and filtering circuit consists of a diode D3, a diode D4, a capacitor C6, a capacitor C7 and an inductor L2, wherein the connecting end of the anode of the diode D3 and the anode of the diode D4 is connected with one end of a first secondary coil of an isolation transformer T1, the connecting end of the cathode of the diode D3 and the cathode of the diode D4 is divided into two paths, one path is connected with one end of the capacitor C6, and the other path is connected with one end of the inductor L2; the other end of the inductor L3 is divided into two paths, one path is connected with one end of the capacitor C7, and the other path is the output end of the first rectifying and filtering circuit;
the second rectifying and filtering circuit consists of a diode D5, a diode D6, a capacitor C8, a capacitor C9 and an inductor L3, wherein the connecting end of the cathode of the diode D5 and the cathode of the diode D6 is connected with one end of a second secondary coil of the isolation transformer T1, the connecting end of the anode of the diode D5 and the anode of the diode D6 is divided into two paths, one path is connected with one end of the capacitor C8, and the other path is connected with one end of the inductor L3; the other end of the inductor L3 is divided into two paths, one path is connected with one end of the capacitor C9, and the other path is the output end of the second rectifying and filtering circuit;
the other end of the first secondary coil of the isolation transformer T1, the other end of the capacitor C6 and the other end of the capacitor C7, the other end of the second secondary coil of the isolation transformer T1, the other end of the capacitor C8 and the other end of the capacitor C9 are all grounded.
The above two-way DC-DC converter is characterized in that: the pulse width modulation circuit comprises a chip UCC2805 and a MOS transistor Q1, wherein a 1 st pin of the chip UCC2805 is connected with one end of a capacitor C4 through a resistor R8, a 4 th pin of the chip UCC2805 is divided into two paths, one path is connected with an 8 th pin of the chip UCC2805 through a resistor R9, and the other path is grounded through a capacitor C5; a 5 th pin of the chip UCC2805 is grounded, a 7 th pin of the chip UCC2805 is divided into two paths, one path is connected with the other end of the resistor R1, and the other path is connected with the output end of the bootstrap circuit; a 6 th pin of the chip UCC2805 is connected with a gate of an MOS tube Q1, a drain of the MOS tube Q1 is an output end of the pulse width modulation circuit, a source of the MOS tube Q1 is divided into two paths, one path is grounded through a resistor R7, and the other path is connected with a 3 rd pin of the chip UCC2805 through a resistor R6;
the bootstrap circuit consists of a diode D1, a resistor R2 and a capacitor C2, wherein the cathode of the diode D1 is connected with one end of the resistor R2, the other end of the resistor R2 is divided into two paths, one path is grounded through the capacitor C2, and the other path is the output end of the bootstrap circuit;
the voltage feedback circuit consists of a diode D2, a resistor R3, a capacitor C3, a resistor R4 and a resistor R5, the cathode of the diode D2 is connected with one end of the resistor R3, the other end of the resistor R3 is divided into two paths, one path is grounded through the capacitor C3, and the other path is connected with one end of the resistor R4; the other end of the resistor R4 is divided into three paths, one path is grounded through the resistor R5, the other path is connected with the 2 nd pin of the chip UCC2805, and the third path is connected with the other end of the capacitor C4; the anode of the diode D1 and the anode of the diode D2 are both connected with one end of the feedback coil of the isolation transformer T1, and the other end of the feedback coil of the isolation transformer T1 is grounded.
Compared with the prior art, the utility model has the following advantage:
1. the circuit has the advantages of simple structure, reasonable design, fewer components, low cost and small volume.
2. The utility model is provided with the isolation transformer, firstly, the magnetic isolation is realized by exchanging energy through the magnetic field, the electric isolation and the signal transmission between the input and the output are avoided by adopting the photoelectric coupler, and the reliability is higher; secondly, to implement the buck function, the +28V is converted to +15V and-15V outputs.
3. The utility model discloses set up voltage feedback circuit, and voltage feedback circuit is connected with isolation transformer, realizes voltage signal's feedback, avoids the setting of another transformer, reduces the circuit volume.
4. The utility model discloses set up the pulse width modulation circuit, be for the switching voltage of the feedback voltage that sends the voltage feedback circuit and isolation transformer current signal carries out the comparison to adjust the pulse width of pulse width modulation circuit output pulse, thereby the direct current of first rectification filter circuit and second rectification filter circuit output is stable.
5. The utility model discloses set up first rectification filter circuit and second rectification filter circuit, first rectification filter circuit is for exporting positive DC voltage, and second rectification filter circuit is for exporting negative DC voltage to satisfy dual power supply demand, it is convenient to use.
To sum up, the utility model has the advantages of simple structure and reasonable design and components and parts are few, and are small, and the reliability is high, realizes the transform of direct current to direct current, and the practicality is strong.
The technical solution of the present invention is further described in detail with reference to the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic block diagram of the circuit of the present invention.
Fig. 2 is a schematic circuit diagram of the present invention.
Description of reference numerals:
1-a filter circuit; 2-an isolation transformer; 3-a first rectifying and filtering circuit;
4-pulse width modulation circuit; 5-a bootstrap circuit; 6-voltage feedback circuit;
7-a direct current power supply; and 8, a second rectifying and filtering circuit.
Detailed Description
As shown in fig. 1, the utility model discloses a dc power supply 7, filter circuit 1, isolation transformer 2 and the rectification transform module that connect gradually, and to the feedback control circuit that rectification transform module output was adjusted, the rectification transform module includes first rectification filter circuit 3 and second rectification filter circuit 8, the feedback control circuit includes pulse width modulation circuit 4 and the bootstrap circuit 5 and the voltage feedback circuit 6 of being connected with isolation transformer 2, bootstrap circuit 5 and voltage feedback circuit 6 all are connected with pulse width modulation circuit 4.
As shown in fig. 2, in this embodiment, the filter circuit 1 includes an inductor L1 and a capacitor C1, one end of the inductor L1 is connected to the output terminal of the dc power supply 7, the other end of the inductor L1 is divided into two paths, one path is grounded through the capacitor C1, and the other path is the output terminal of the filter circuit 1.
As shown in fig. 2, in this embodiment, the isolation transformer 2 includes an isolation transformer T1, one end of the primary winding of the isolation transformer T1 is divided into two paths, one path is connected to the output end of the filter circuit 1, and the other path is connected to one end of a resistor R1; the other end of the primary coil of the isolation transformer T1 is connected with the output end of the pulse width modulation circuit 4;
the first rectifying and filtering circuit 3 is composed of a diode D3, a diode D4, a capacitor C6, a capacitor C7 and an inductor L2, a connection end of an anode of the diode D3 and an anode of the diode D4 is connected with one end of a first secondary coil of the isolation transformer T1, a connection end of a cathode of the diode D3 and a cathode of the diode D4 is divided into two paths, one path is connected with one end of the capacitor C6, and the other path is connected with one end of the inductor L2; the other end of the inductor L2 is divided into two paths, one path is connected with one end of the capacitor C7, and the other path is the output end of the first rectifying and filtering circuit 3;
the second rectifying and filtering circuit 8 consists of a diode D5, a diode D6, a capacitor C8, a capacitor C9 and an inductor L3, wherein the connection end of the cathode of the diode D5 and the cathode of the diode D6 is connected with one end of a second secondary coil of the isolation transformer T1, the connection end of the anode of the diode D5 and the anode of the diode D6 is divided into two paths, one path is connected with one end of the capacitor C8, and the other path is connected with one end of the inductor L3; the other end of the inductor L3 is divided into two paths, one path is connected with one end of the capacitor C9, and the other path is the output end of the second rectifying and filtering circuit 8;
the other end of the first secondary coil of the isolation transformer T1, the other end of the capacitor C6 and the other end of the capacitor C7, the other end of the second secondary coil of the isolation transformer T1, the other end of the capacitor C8 and the other end of the capacitor C9 are all grounded.
As shown in fig. 2, in this embodiment, the pulse width modulation circuit 4 includes a chip UCC2805 and a MOS transistor Q1, a 1 st pin of the chip UCC2805 is connected to one end of a capacitor C4 through a resistor R8, a 4 th pin of the chip UCC2805 is divided into two paths, one path is connected to an 8 th pin of the chip UCC2805 through a resistor R9, and the other path is grounded through a capacitor C5; a 5 th pin of the chip UCC2805 is grounded, a 7 th pin of the chip UCC2805 is divided into two paths, one path is connected with the other end of the resistor R1, and the other path is connected with an output end of the bootstrap circuit 5; a 6 th pin of the chip UCC2805 is connected with a gate of an MOS tube Q1, a drain of the MOS tube Q1 is an output end of the pulse width modulation circuit 4, a source of the MOS tube Q1 is divided into two paths, one path is grounded through a resistor R7, and the other path is connected with a 3 rd pin of the chip UCC2805 through a resistor R6;
the bootstrap circuit 5 is composed of a diode D1, a resistor R2 and a capacitor C2, the cathode of the diode D1 is connected with one end of the resistor R2, the other end of the resistor R2 is divided into two paths, one path is grounded through the capacitor C2, and the other path is the output end of the bootstrap circuit 5;
the voltage feedback circuit 6 is composed of a diode D2, a resistor R3, a capacitor C3, a resistor R4 and a resistor R5, the cathode of the diode D2 is connected with one end of the resistor R3, the other end of the resistor R3 is divided into two paths, one path is grounded through the capacitor C3, and the other path is connected with one end of the resistor R4; the other end of the resistor R4 is divided into three paths, one path is grounded through the resistor R5, the other path is connected with the 2 nd pin of the chip UCC2805, and the third path is connected with the other end of the capacitor C4; the anode of the diode D1 and the anode of the diode D2 are both connected with one end of the feedback coil of the isolation transformer T1, and the other end of the feedback coil of the isolation transformer T1 is grounded.
In this embodiment, during actual connection, one end of the primary coil of the isolation transformer T1 is divided into two paths, one path is connected to the connection end of the other end of the inductor L1 and the other end of the capacitor C1, and the other path is connected to one end of the resistor R1; the other end of the primary coil of the isolation transformer T1 is connected with the drain of the MOS transistor Q1.
In this embodiment, during actual connection, the 7 th pin of the chip UCC2805 is connected to the connection end of the other end of the resistor R1, the other end of the resistor R2 and one end of the capacitor C2, and the other end of the capacitor C2 is grounded.
In this embodiment, in practical implementation, the inductance of the inductor L1 is 1 μ H, and the capacitor C1 is a nonpolar capacitor with a capacitance of 1 μ F.
In this embodiment, the inductor L1 and the capacitor C1 form a low-pass filter circuit, so as to prevent the fluctuation of the input power of the dc power supply 7 caused by the turn-off of the MOS transistor Q1 and the instantaneous change of the primary coil of the isolation transformer T1.
In this embodiment, the primary coil, the first secondary coil, the second secondary coil, and the feedback coil of the isolation transformer 2 have a coil turn ratio of 13:19:19: 13.
In the embodiment, the isolation transformer 2 is arranged to exchange energy through a magnetic field, so that magnetic isolation is realized, electric isolation and signal transmission between input and output are avoided by adopting a photoelectric coupler, and the reliability is high; in addition, a feedback coil is arranged to realize the feedback of a voltage signal, so that the arrangement of another transformer is avoided, and the circuit volume is reduced; secondly, to implement the buck function, the +28V is converted to +15V and-15V outputs.
In this embodiment, the primary winding of the isolation transformer 2 is isolated from the first secondary winding and the second secondary winding of the isolation transformer 2, and it transmits the energy coupled and transferred by the primary winding of the isolation transformer 2 to the first rectifying and filtering circuit 3 to generate +15V output voltage and the second rectifying and filtering circuit 8 to generate-15V voltage.
In this embodiment, the voltage range of the dc power supply 7 is +16V to + 40V.
In this embodiment, the voltage of the dc power supply 7 is further selected to be +28V, and the +28V is converted into +15V and-15V for output.
In this embodiment, the resistances of the resistor R3, the resistor R2, and the resistor R6 are all 100 Ω, the resistance of the resistor R4 is 10k Ω, the resistance of the resistor R5 is 2.8k Ω, the resistance of the resistor R7 is 0.8 Ω, and the capacitance of the capacitor C3 is 10 nF.
In this embodiment, a diode D1, a resistor R2, and a capacitor C2 are provided to form a bootstrap circuit, the diode D1 is to avoid current backflow, the capacitor C2 is used as a bootstrap capacitor, and the voltage on the feedback coil side of the isolation transformer T1 charges the bootstrap capacitor C2 through the diode D1 and the resistor R2, so that the voltage on the feedback coil side of the isolation transformer T1 and the voltage on the capacitor C2 are boosted to realize bootstrap and supply power to the chip UCC 2805.
In this embodiment, a diode D2, a resistor R3, a capacitor C3, a resistor R4, and a resistor R5 are provided to form a voltage feedback circuit 6, the voltage on the feedback coil side of the isolation transformer T1 is further rectified and filtered by a diode D2, a resistor R3, and a capacitor C3 to form a feedback voltage, and the formed feedback voltage is divided by a resistor R4 and a resistor R5 and then sent to the FB terminal of the UCC 2805.
In this embodiment, the resistor R8 and the capacitor C4 are provided to improve the gain and frequency characteristics of the error amplifier in the UCC2805, and are used as a correction network for the error amplifier in the UCC2805 to ensure that the entire feedback loop operates stably without oscillation.
In this embodiment, the resistor R7 is used as a current sampling resistor to convert current signals of the first primary coil and the second primary coil of the isolation transformer T1 into a voltage, and send the converted voltage to the 3 rd pin of the chip UCC2805, when the first primary coil and the second primary coil of the isolation transformer T1 are overcurrent, the drain current of the MOS transistor Q1 is increased, and the converted voltage is increased until the converted voltage is equal to 1.55V, and the 6 th pin of the chip UCC2805 outputs a pulse to turn off the MOS transistor Q1, thereby implementing overcurrent protection.
In this embodiment, it should be noted that the resistor R7 samples the on-state current of the MOS transistor Q1, and since the on-state current of the MOS transistor Q1 is proportional to the magnitude of the load current in the DC-DC converter, the voltage applied to the 3 rd pin of the UCC2805 directly reflects the magnitude of the output load current of the DC-DC converter.
In the present embodiment, it should be noted that the voltage on the feedback coil side of the isolation transformer T1 is collected as the voltage on the first secondary coil side and the second secondary coil side of the isolation transformer T1 for feedback, because the ratio of the voltage of the feedback coil of the isolation transformer T1 to the voltage of the first secondary coil of the isolation transformer T1 to the voltage of the second secondary coil of the isolation transformer T1 is determined by the number of turns of the second secondary coil of the isolation transformer T1 to the voltage of the first secondary coil of the isolation transformer T1 to the voltage of the second secondary coil of the isolation transformer T1, and in the feedback voltage loop, the voltage stabilization control of + Vout and-Vout is realized by controlling the voltage on the feedback coil side of the isolation transformer T1, that is, by controlling the voltage on the first secondary coil side and the second secondary coil side of the isolation transformer T1.
In this embodiment, the feedback voltage is sent to the FB terminal of the chip UCC2805, i.e., the inverting input terminal of the error amplifier in the chip UCC2805, the non-inverting input terminal of the error amplifier in the chip UCC2805 is connected to the reference voltage inside the chip UCC2805, the error between the feedback voltage and the reference voltage is amplified by the error amplifier and then sent to the voltage comparator inside the chip UCC2805, the voltage comparator is compared with the conversion voltage of the 3 rd pin of the chip UCC2805, the current of the MOS transistor Q1 increases linearly from the on state until the current is equal to the output voltage of the error amplifier, the voltage comparator is inverted, the 3 rd pin of the chip UCC2805 turns off the MOS transistor Q1, and the output voltage is controlled to be stabilized by voltage negative feedback. And when the input voltage changes or the output load changes to cause the output voltage + Vout and-Vout to change, the voltage feedback circuit 6 will change the pulse width of the output pulse of the 6 th pin of the UCC2805, so that the circuit reaches a new balance, and the voltages at the sides of the first secondary coil and the second secondary coil of the isolation transformer 2 are stabilized, and further the positive dc output by the first rectifying and filtering circuit 3 and the negative dc output by the second rectifying and filtering circuit 8 are stabilized.
In this embodiment, the resistor R9 and the capacitor C5 are provided to charge the capacitor C5 to provide a certain voltage to the 4 th pin of the chip UCC2805 through the resistor R9 by using the reference voltage of the 8 th pin of the chip UCC2805, so as to operate the oscillator in the chip UCC2805, thereby controlling the frequency of the output pulse of the 6 th pin of the chip UCC 2805.
In this embodiment, in practical implementation, the capacitance values of the capacitor C6 and the capacitor C7, and the capacitance values of the capacitor C8 and the capacitor C9 are all 1uF, and the inductance values of the inductor L2 and the inductor L3 are all 10 uH.
In this embodiment, the diode D3 and the diode D4 are provided as first rectifying elements to half-wave rectify the voltage value on the first secondary coil side of the isolation transformer T1; the capacitor C6, the capacitor C7 and the inductor L2 are arranged to form an LC-pi type filter circuit, and rectified voltage is filtered through the capacitor C6, the inductor L2 and the capacitor C7, so that the filter effect is improved, and the output +15V direct current is smoother.
In this embodiment, the diode D5 and the diode D6 are provided as second rectifying elements to half-wave rectify the voltage value on the second secondary coil side of the isolation transformer T1; the capacitor C8, the capacitor C9 and the inductor L3 are arranged to form an LC-pi type filter circuit, and rectified voltage is filtered through the capacitor C8, then filtered through the inductor L3 and the capacitor C9, so that the filter effect is improved, and the output-15V direct current is smoother.
In this embodiment, the capacitance of the capacitor C4 is 2.2nF, the resistance of the resistor R8 is 680 Ω, the resistance of the resistor R9 is 10k Ω, the capacitance of the capacitor C5 is 82pF, the capacitance of the capacitor C2 is 15 μ F, and the resistance of the resistor R1 is 36k Ω.
The utility model discloses during the use, DC power supply 7 is after inductance L1 and electric capacity C1 low pass filtering, the direct current after the filtering is again through resistance R1 for chip UCC2805 power supply, chip UCC2805 work, MOS pipe Q1 switches on, then the direct current after the filtering is again through isolation transformer T1's primary coil, MOS pipe Q1 and resistance R7, and the primary coil of isolation transformer T1 and the coil number of turns of first secondary coil and second secondary coil are different, rise through isolation transformer T1 with the +28V direct current that DC power supply 7 provided and step down, then through diode D3 and diode D4 rectification, and electric capacity C6 filters, inductance L2 and electric capacity C7 filters, obtain the +15V direct current output after the rectification; and meanwhile, the rectified direct current of-15V is obtained through rectification by a diode D5 and a diode D6, filtering by a capacitor C8, and filtering by an inductor L3 and a capacitor C9 in sequence.
The above, only be the utility model discloses a preferred embodiment, it is not right the utility model discloses do any restriction, all according to the utility model discloses the technical entity all still belongs to any simple modification, change and the equivalent structure change of doing above embodiment the utility model discloses technical scheme's within the scope of protection.
Claims (4)
1. A two-way DC-DC converter, characterized by: including direct current power supply (7), filter circuit (1), isolation transformer (2) and the rectification transform module that connects gradually, and to the feedback control circuit that rectification transform module output was adjusted, the rectification transform module includes first rectification filter circuit (3) and second rectification filter circuit (8), the feedback control circuit includes pulse width modulation circuit (4) and bootstrap circuit (5) and voltage feedback circuit (6) of being connected with isolation transformer (2), bootstrap circuit (5) and voltage feedback circuit (6) all are connected with pulse width modulation circuit (4).
2. A two-way DC-DC converter according to claim 1, wherein: filter circuit (1) includes inductance L1 and electric capacity C1, inductance L1's one end meets with DC power supply (7)'s output, inductance L1's the other end divides two the tunnel, and through electric capacity C1 ground connection all the way, another way is filter circuit (1)'s output.
3. A two-way DC-DC converter according to claim 1, wherein: the isolation transformer (2) comprises an isolation transformer T1, one end of a primary coil of the isolation transformer T1 is divided into two paths, one path is connected with the output end of the filter circuit (1), and the other path is connected with one end of a resistor R1; the other end of the primary coil of the isolation transformer T1 is connected with the output end of the pulse width modulation circuit (4);
the first rectifying and filtering circuit (3) consists of a diode D3, a diode D4, a capacitor C6, a capacitor C7 and an inductor L2, wherein the connecting end of the anode of the diode D3 and the anode of the diode D4 is connected with one end of a first secondary coil of an isolation transformer T1, the connecting end of the cathode of the diode D3 and the cathode of the diode D4 is divided into two paths, one path is connected with one end of the capacitor C6, and the other path is connected with one end of the inductor L2; the other end of the inductor L2 is divided into two paths, one path is connected with one end of a capacitor C7, and the other path is the output end of the first rectifying and filtering circuit (3);
the second rectifying and filtering circuit (8) consists of a diode D5, a diode D6, a capacitor C8, a capacitor C9 and an inductor L3, the connecting end of the cathode of the diode D5 and the cathode of the diode D6 is connected with one end of a second secondary coil of the isolation transformer T1, the connecting end of the anode of the diode D5 and the anode of the diode D6 is divided into two paths, one path is connected with one end of the capacitor C8, and the other path is connected with one end of the inductor L3; the other end of the inductor L3 is divided into two paths, one path is connected with one end of a capacitor C9, and the other path is the output end of a second rectifying and filtering circuit (8);
the other end of the first secondary coil of the isolation transformer T1, the other end of the capacitor C6 and the other end of the capacitor C7, the other end of the second secondary coil of the isolation transformer T1, the other end of the capacitor C8 and the other end of the capacitor C9 are all grounded.
4. A two-way DC-DC converter according to claim 3, wherein: the pulse width modulation circuit (4) comprises a chip UCC2805 and a MOS transistor Q1, wherein a 1 st pin of the chip UCC2805 is connected with one end of a capacitor C4 through a resistor R8, a 4 th pin of the chip UCC2805 is divided into two paths, one path is connected with an 8 th pin of the chip UCC2805 through a resistor R9, and the other path is grounded through a capacitor C5; a 5 th pin of the chip UCC2805 is grounded, a 7 th pin of the chip UCC2805 is divided into two paths, one path is connected with the other end of the resistor R1, and the other path is connected with the output end of the bootstrap circuit (5); a 6 th pin of the chip UCC2805 is connected with a grid electrode of an MOS tube Q1, a drain electrode of the MOS tube Q1 is an output end of the pulse width modulation circuit (4), a source electrode of the MOS tube Q1 is divided into two paths, one path is grounded through a resistor R7, and the other path is connected with a 3 rd pin of the chip UCC2805 through a resistor R6;
the bootstrap circuit (5) is composed of a diode D1, a resistor R2 and a capacitor C2, the cathode of the diode D1 is connected with one end of the resistor R2, the other end of the resistor R2 is divided into two paths, one path is grounded through the capacitor C2, and the other path is the output end of the bootstrap circuit (5);
the voltage feedback circuit (6) is composed of a diode D2, a resistor R3, a capacitor C3, a resistor R4 and a resistor R5, the cathode of the diode D2 is connected with one end of the resistor R3, the other end of the resistor R3 is divided into two paths, one path is grounded through the capacitor C3, and the other path is connected with one end of the resistor R4; the other end of the resistor R4 is divided into three paths, one path is grounded through the resistor R5, the other path is connected with the 2 nd pin of the chip UCC2805, and the third path is connected with the other end of the capacitor C4; the anode of the diode D1 and the anode of the diode D2 are both connected with one end of the feedback coil of the isolation transformer T1, and the other end of the feedback coil of the isolation transformer T1 is grounded.
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| CN201921178721.6U CN209948965U (en) | 2019-07-25 | 2019-07-25 | Double-circuit DC-DC converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022027744A1 (en) * | 2020-08-07 | 2022-02-10 | 厦门能瑞康电子有限公司 | Separately-excited micro-power module |
| CN114301295A (en) * | 2020-10-07 | 2022-04-08 | 浙江杭可仪器有限公司 | Direct-current integrated power supply and design method thereof |
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2019
- 2019-07-25 CN CN201921178721.6U patent/CN209948965U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022027744A1 (en) * | 2020-08-07 | 2022-02-10 | 厦门能瑞康电子有限公司 | Separately-excited micro-power module |
| CN114301295A (en) * | 2020-10-07 | 2022-04-08 | 浙江杭可仪器有限公司 | Direct-current integrated power supply and design method thereof |
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