CN210075087U - Direct current conversion circuit and direct current conversion device with high conversion efficiency - Google Patents
Direct current conversion circuit and direct current conversion device with high conversion efficiency Download PDFInfo
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- CN210075087U CN210075087U CN201921099414.9U CN201921099414U CN210075087U CN 210075087 U CN210075087 U CN 210075087U CN 201921099414 U CN201921099414 U CN 201921099414U CN 210075087 U CN210075087 U CN 210075087U
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Abstract
The utility model discloses a high conversion efficiency's direct current converting circuit and direct current conversion equipment, among the direct current converting circuit, acquire the output voltage condition of DC-DC conversion unit through voltage feedback circuit in order to acquire voltage feedback signal, main control circuit controls the conversion control signal of DC-DC conversion unit according to voltage feedback signal output, direct current converting circuit at this moment is in closed loop control state; in addition, the current feedback circuit is arranged to detect the output current condition of the DC-DC conversion unit so as to obtain a current feedback signal, the main control circuit controls whether to output an open-loop control signal according to the current feedback signal, the open-loop control circuit interrupts the voltage feedback of the voltage feedback circuit according to the open-loop control signal under the condition of outputting the open-loop control signal, the direct current conversion circuit is in an open-loop control state at the moment, the direct current conversion circuit works at the maximum conversion efficiency, and the conversion efficiency of the circuit is effectively improved. The DC conversion device has high conversion efficiency due to the DC conversion circuit with high conversion efficiency.
Description
Technical Field
The utility model belongs to the technical field of the direct current conversion and specifically relates to a high conversion efficiency's direct current converting circuit and direct current conversion device.
Background
A DC-DC converter is a device that changes electric energy of one voltage value into electric energy of another voltage value in a direct current circuit, and the DC-DC converter is classified into three types: boost DC/DC converters, buck DC/DC converters, and boost DC/DC converters, the DC-DC converters have been widely used in products such as mobile phones, MP3, digital cameras, and portable media players.
In the prior art, with the development of technology, higher requirements are put on the DC/DC converter, and the performance requirement is developing toward high efficiency and miniaturization.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving, at least to some extent, one of the problems in the related art. Therefore, an object of the present invention is to provide a dc conversion circuit and a dc conversion device with high conversion efficiency, which can improve the dc conversion efficiency.
The utility model adopts the technical proposal that:
in a first aspect, the present invention provides a DC conversion circuit with high conversion efficiency, which includes a DC input terminal, a DC-DC conversion unit, a DC output terminal, a voltage feedback circuit for acquiring a voltage feedback signal of an output terminal of the DC-DC conversion unit, a current feedback circuit for acquiring a current feedback signal of an output terminal of the DC-DC conversion unit, an open loop control circuit, and a main control circuit; the main control circuit is used for outputting a conversion control signal for controlling the work of the DC-DC conversion unit according to the voltage feedback signal, the main control circuit is used for controlling whether an open-loop control signal is output or not according to the current feedback signal, and the open-loop control circuit is used for interrupting the voltage feedback of the voltage feedback circuit according to the open-loop control signal;
the direct current input end is connected with the input end of the DC-DC conversion unit, the output end of the DC-DC conversion unit is respectively connected with the direct current output end, the input end of the voltage feedback circuit and the input end of the current feedback circuit, the output end of the voltage feedback circuit and the output end of the current feedback circuit are both connected with the input end of the main control circuit, the output end of the main control circuit is connected with the control end of the DC-DC conversion unit to input the conversion control signal, the output end of the main control circuit is connected with the input end of the open-loop control circuit, and the output end of the open-loop control circuit is connected with the input end of the voltage feedback circuit.
Further, the DC-DC conversion unit includes a DC-DC conversion circuit and a rectifying and filtering circuit, the DC input end is connected to the input end of the DC-DC conversion circuit, the output end of the DC-DC conversion circuit is connected to the input end of the rectifying and filtering circuit, the output end of the rectifying and filtering circuit is respectively connected to the DC output end, the input end of the voltage feedback circuit, and the input end of the current feedback circuit, and the output end of the main control circuit is connected to the control end of the DC-DC conversion circuit.
Further, the direct current conversion circuit further comprises an LC resonance circuit, and the output end of the DC-DC conversion circuit is connected with the input end of the rectification filter circuit through the LC resonance circuit.
Further, the DC conversion circuit further includes a current detection circuit for obtaining a current feedback signal at an input terminal of the DC-DC conversion circuit, the DC input terminal is connected to the input terminal of the DC-DC conversion circuit through the current detection circuit, and an output terminal of the current detection circuit is connected to an input terminal of the main control circuit.
Further, the DC-DC conversion circuit includes a first power tube, a second power tube and a transformer, a negative end of the DC input terminal is connected to both a negative output terminal of the first power tube and a negative output terminal of the second power tube, and a control terminal of the first power tube and a control terminal of the second power tube are respectively used as a control terminal of the DC-DC conversion circuit; the positive output end of the first power tube is connected with the first input end of the transformer, the positive output end of the second power tube is connected with the second input end of the transformer, the positive end of the direct current input end is connected with the middle input end of the transformer, and the output end of the transformer is connected with the input end of the rectification filter circuit.
Further, the first power tube and/or the second power tube are/is an MOS tube, a gate of the MOS tube is a control end of the power tube, a source of the MOS tube is a negative output end of the power tube, and a drain of the MOS tube is a positive output end of the power tube.
Further, the rectification filter circuit comprises a rectifier bridge and a filter capacitor, an output end of the DC-DC conversion circuit is connected with an input end of the rectifier bridge, an output end of the rectifier bridge is connected with an input end of the filter capacitor, and an output end of the filter capacitor is respectively connected with the direct current output end, an input end of the voltage feedback circuit and an input end of the current feedback circuit.
Further, the voltage feedback circuit comprises an operational amplifier and a reference voltage circuit, an output end of the DC-DC conversion unit is connected with a non-inverting input end of the operational amplifier, an output end of the reference voltage circuit is connected with an inverting input end of the operational amplifier, and an output end of the operational amplifier is connected with an input end of the main control circuit.
Further, the open-loop control circuit comprises a switch tube and a signal input end used for receiving the open-loop control signal, the signal input end is connected with the control end of the switch tube, the positive output end of the switch tube is connected with the non-inverting input end of the operational amplifier, and the negative output end of the switch tube is grounded.
In a second aspect, the present invention provides a dc conversion device, including the dc conversion circuit with high conversion efficiency.
The utility model has the advantages that:
in the DC conversion circuit of the present invention, the output voltage condition of the DC-DC conversion unit is obtained through the voltage feedback circuit to obtain the voltage feedback signal, the main control circuit outputs the conversion control signal for controlling the DC-DC conversion unit according to the voltage feedback signal, and the DC conversion circuit is in the closed-loop control state at this time; in addition, a current feedback circuit is arranged to detect the output current condition of the DC-DC conversion unit so as to obtain a current feedback signal, the main control circuit controls whether to output an open-loop control signal according to the current feedback signal, under the condition of outputting the open-loop control signal, the open-loop control circuit interrupts the voltage feedback of the voltage feedback circuit according to the open-loop control signal, the direct current conversion circuit is in an open-loop control state at the moment, the direct current conversion circuit works at the maximum conversion efficiency, the circuit utilization rate is improved, and the conversion efficiency of the circuit is effectively improved; the technical problem that a DC/DC conversion circuit cannot meet the requirement of high conversion efficiency in the prior art is solved. On the other hand, the dc conversion device has high conversion efficiency due to the dc conversion circuit having high conversion efficiency.
Drawings
Fig. 1 is a block diagram of an embodiment of a dc converter circuit with high conversion efficiency according to the present invention;
fig. 2 is a circuit diagram of an embodiment of the DC input terminal, the current detection circuit and the DC-DC conversion unit of the present invention;
fig. 3 is a circuit diagram of an embodiment of the middle open-loop control circuit and the voltage feedback circuit of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Example 1
Referring to fig. 1, fig. 1 exemplarily shows a block diagram of a high-conversion-efficiency direct current conversion circuit, which includes a direct current input terminal 1, a DC-DC conversion unit 2, a direct current output terminal 3, a voltage feedback circuit 7 for acquiring a voltage feedback signal of an output terminal of the DC-DC conversion unit 2, a current feedback circuit 8 for acquiring a current feedback signal of an output terminal of the DC-DC conversion unit 2, an open-loop control circuit 6, and a main control circuit 5; the main control circuit 5 is configured to output a conversion control signal for controlling the operation of the DC-DC conversion unit 2 according to the voltage feedback signal, the main control circuit 5 is configured to control whether to output an open-loop control signal according to the current feedback signal, and the open-loop control circuit 6 is configured to interrupt the voltage feedback of the voltage feedback circuit 7 according to the open-loop control signal, so that the voltage feedback circuit 7 cannot perform voltage feedback.
Specifically, the direct current input end 1 is connected with an input end of a DC-DC conversion unit 2, an output end of the DC-DC conversion unit 2 is respectively connected with a direct current output end 3, an input end of a voltage feedback circuit 7 and an input end of a current feedback circuit 8, an output end of the voltage feedback circuit 7 and an output end of the current feedback circuit 8 are both connected with an input end of a main control circuit 5, an output end of the main control circuit 5 is connected with a control end of the DC-DC conversion unit 2 to input a conversion control signal, an output end of the main control circuit 5 is connected with an input end of an open-loop control circuit 6, an output end of the open-loop control circuit 6 is connected with an input end of the voltage feedback circuit 7, and when the direct current conversion circuit is actually used, the direct current.
In this embodiment, the voltage feedback circuit 7 is used to obtain the output voltage condition of the DC-DC conversion unit 2 to obtain a voltage feedback signal, the main control circuit 5 outputs a conversion control signal for controlling the DC-DC conversion unit 2 according to the voltage feedback signal, and the DC conversion circuit is in a closed-loop control state at this time; in addition, a current feedback circuit 8 is arranged to detect the output current condition of the DC-DC conversion unit 2 to obtain a current feedback signal, the current feedback signal can reflect the load condition of the DC conversion circuit, such as heavy load and light load, the main control circuit 5 controls whether to output an open-loop control signal according to the current feedback signal, for example, when the current feedback signal is determined to be heavy load, the open-loop control signal is output, and when the current feedback signal is determined to be light load, the closed-loop control signal is output; under the condition of outputting the open-loop control signal, the open-loop control circuit 6 interrupts the voltage feedback of the voltage feedback circuit 7 according to the open-loop control signal, the direct current conversion circuit is in the open-loop control state at the moment, the direct current conversion circuit works with the maximum conversion efficiency, the utilization rate of the circuit is improved, the conversion efficiency of the circuit is effectively improved, and the technical problem that the DC/DC conversion circuit cannot meet the requirement of high conversion efficiency in the prior art is solved. When the closed-loop control signal is output, the open-loop control circuit 6 does not interrupt the voltage feedback of the voltage feedback circuit 7, and the main control circuit 5 outputs the switching control signal for controlling the DC-DC conversion unit 2 according to the voltage feedback signal, that is, the DC-DC conversion unit 2 is in the closed-loop control state at this time.
In some application scenarios, a preset current value is set, the current value of the current feedback signal is compared with the preset current value, when the current value of the current feedback signal is greater than the preset current value, the circuit is in a heavy load state, and when the current value of the current feedback signal is less than the preset current value, the circuit is in a light load state.
On the other hand, in some application scenarios, the main control circuit may further control whether to output an open-loop control signal according to the current feedback signal and the voltage feedback signal, obtain an output power (P ═ UI) according to the current feedback signal and the voltage feedback signal, and then determine a condition of a load carried by the dc conversion circuit according to the output power and a preset output power, that is, determine that the circuit is under a light load or a heavy load, output the open-loop control signal when the circuit is under the heavy load, and output the closed-loop control signal when the circuit is under the light load. In this embodiment, the preset output power is set, the output power is compared with the preset output power, and when the output power is greater than the preset output power, the circuit is under heavy load, otherwise, the circuit is under light load. The preset output power can be set to 20% of the rated load of the dc conversion circuit, and the value of 20% can be adjusted according to the circuit requirement. When the load of the circuit reaches more than 20% of the rated load, the judgment circuit is heavy load at the moment, and otherwise, the circuit is light load.
Further, referring to fig. 1, the DC-DC conversion unit 2 includes a DC-DC conversion circuit 2-1, an LC resonant circuit 2-2 and a rectifying and filtering circuit 2-3, the DC conversion circuit further includes a current detection circuit 4 for obtaining a current feedback signal at an input terminal of the DC-DC conversion circuit 2-1, the DC input terminal 1 is connected to the input terminal of the DC-DC conversion circuit 2-1 through the current detection circuit 4, an output terminal of the DC-DC conversion circuit 2-1 is connected to an input terminal of the rectifying and filtering circuit 2-3 through the LC resonant circuit 2-2, an output terminal of the rectifying and filtering circuit 2-3 is connected to the DC output terminal 3, an input terminal of the voltage feedback circuit 7 and an input terminal of the current feedback circuit 8, an output terminal of the main control circuit 5 is connected to a control terminal of the DC-DC conversion circuit 2-1 for inputting a conversion control signal, the output end of the current detection circuit 4 is connected with the input end of the main control circuit 5.
The current detection circuit 4 is arranged to detect the current of the input end of the DC-DC conversion circuit 2-1 so as to realize the current feedback of the front end, and the main control circuit 5 can know the current condition of the input end of the DC-DC conversion circuit 2-1; and an LC resonance circuit 2-2 is arranged between the DC-DC conversion circuit 2-1 and the rectification filter circuit 2-3, so that the main control circuit 5 realizes the soft switching control of the DC-DC conversion circuit 2-1, the voltage spike in the circuit is reduced, and the conversion efficiency of the DC conversion circuit is further improved.
Preferably, referring to fig. 1 and 2, fig. 2 exemplarily shows a circuit diagram of the DC input terminal, the current detection circuit and the DC-DC conversion unit, the DC input terminal 1 includes a first filter capacitor CE1, and the input DC voltage is filtered by the first filter capacitor CE1 to form a first DC 1. The current detection circuit 4 includes a current feedback resistor FR1, and the current feedback resistor FR1 samples the first direct current DC1 (i.e., the input current of the DC-DC conversion circuit 2-1) and transmits the sampled current to the input terminal of the main control circuit through the output terminal IS 1. In this embodiment, the main control circuit includes a processor such as a single chip, and the processor is used as a main control center to control the operation of the dc conversion circuit.
Referring to fig. 1 and 2, the DC-DC converter circuit 2-1 includes a first power transistor M1, a second power transistor M2 and a transformer T1, a negative terminal of the DC input terminal 1, i.e., DC1-, is connected to both a negative output terminal of the first power transistor M1 and a negative output terminal of the second power transistor M2 through a current detection circuit 4, a control terminal PWM1 of the first power transistor M1 and a control terminal PWM2 of the second power transistor M2 are respectively used as control terminals of the DC-DC converter circuit, and an output terminal of the main control circuit outputs a conversion control signal to the control terminal PWM1 and the control terminal PWM 2; the positive output end of the first power tube M1 is connected with the first input end a of the transformer T1, the positive output end of the second power tube M2 is connected with the second input end C of the transformer T1, the positive end of the direct current input end 1, namely DC1, is connected with the middle input end B of the transformer T1 (namely the middle tap of the transformer T1), and the output end of the transformer T1 is connected with the input ends of the rectifying and filtering circuits 2-3. In this embodiment, the DC-DC conversion circuit 2-1 is a DC-DC boost circuit, converts the control signal into a complementary push-pull PWM signal, and controls the first power tube M1 and the second power tube M2 to be alternately turned on by using a set of complementary push-pull PWM signals to convert the first direct current DC1 into the second direct current, and raise the voltage value of the first direct current DC1 to implement DC boost. Meanwhile, a rectifying and filtering circuit 2-3 is arranged to filter voltage spikes in the second direct current to generate a flat third direct current signal, and the third direct current signal is output to a direct current output end, an input end of a current feedback circuit and an input end of a voltage feedback circuit from output ends DC2 and DC 2-of the rectifying and filtering circuit 2-3.
Further, referring to fig. 2, in the present embodiment, the first power transistor M1 and/or the second power transistor M2 are MOS transistors, a gate of the MOS transistor is a control terminal of the power transistor, a source of the MOS transistor is a negative output terminal of the power transistor, and a drain of the MOS transistor is a positive output terminal of the power transistor. The rectifying and filtering circuit 2-3 comprises a rectifying bridge and a filtering capacitor CE2, the LC resonance circuit 2-2 comprises a resonance inductor Ls and a resonance capacitor CBB1, a first output end D of the transformer T1 is connected with one end of the resonance inductor Ls, the other end of the resonance inductor Ls is connected with one end of the resonance capacitor CBB1, the other end of the resonance capacitor CBB1 is connected with an input end of the rectifying bridge, an output end of the rectifying bridge is connected with an input end of the filtering capacitor CE2, and output ends (namely DC2 and DC2-) of the filtering capacitor CE2 are respectively connected with a direct current output end, an input end of the voltage feedback circuit and an input end of the current feedback circuit. In this embodiment, the rectifier bridge includes diodes D1, D2, D3 and D4, and the resonant inductor Ls is the self-leakage inductance of the transformer T1.
When the LC resonant circuit 2-2 is not added, the first power tube M1 and the second power tube M2 in the DC-DC converter circuit 2-1 work in a hard switching state, and when the power tubes work in the hard switching state, a high voltage spike is generated in the circuit, which will increase the switching loss of the power tubes, and the generated voltage spike will be proportionally transmitted to the rectifying and filtering circuit 2-3 through the transformer T1, and at the same time, higher loss is also brought to the rectifying and filtering circuit 2-3, thereby affecting the conversion efficiency of the DC converter circuit. After the LC resonant circuit 2-2 is arranged, the second direct current is in series resonance with the resonant capacitor CBB1 through the resonant inductor Ls, so that the power tubes (the first power tube M1 and the second power tube M2) work in a soft switching state, voltage spikes in the circuit are reduced, and the conversion efficiency of the direct current conversion circuit is further improved.
Further, referring to fig. 1 and 3, fig. 3 is a circuit diagram of an embodiment of the middle open-loop control circuit and the voltage feedback circuit of the present invention, the voltage feedback circuit includes an operational amplifier IC1 and a reference voltage circuit, an output terminal (i.e., DC2) of the DC-DC conversion unit is connected to a non-inverting input terminal of the operational amplifier IC1, an output terminal of the reference voltage circuit is connected to an inverting input terminal of the operational amplifier IC1, and an output terminal FB1 of the operational amplifier IC1 is connected to an input terminal of the main control circuit. The reference voltage circuit includes a dc power supply VCC2, and voltage dividing resistors R27 and R35, which provide a reference voltage for the operational amplifier IC1, and the voltage value of the reference voltage can be freely set, which is not limited herein. Under the closed-loop control state, the operational amplifier IC1 compares the output voltage of the output terminal DC2 (i.e., the voltage of the third direct current) with the reference voltage to realize voltage feedback, and when the voltage of the output terminal DC2 is greater than the set reference voltage, the operational amplifier IC1 outputs a voltage feedback signal from the output terminal FB1 to the main control circuit after being isolated by the optical coupler PC1, so that the main control circuit can know that the output voltage of the DC-DC conversion unit (i.e., the voltage of the third direct current signal) is too high, and can timely adjust the conversion control signal to control the voltage of the third direct current signal to recover stably.
Referring to fig. 1, 2 and 3, the OPEN-loop control circuit includes a switching tube Q2 and a signal input end OPEN _ PWM for receiving an OPEN-loop control signal, the signal input end OPEN _ PWM is connected to a control end of the switching tube Q2, a positive output end of the switching tube Q2 is connected to a non-inverting input end of the operational amplifier IC1, and a negative output end of the switching tube Q2 is grounded. In this embodiment, the negative output end of the switching tube Q2 is connected with the negative end DC 2-of the output end of the rectifying and filtering circuit 2-3, i.e. grounded; the switching tube Q2 exemplarily adopts an NPN triode, a base of the NPN triode is a control end of the switching tube, a collector of the NPN triode is a positive output end of the switching tube, and an emitter of the NPN triode is a negative output end of the switching tube.
In this embodiment, when the current feedback signal reflects that the load condition of the DC conversion circuit is a light load, that is, the output current of the rectification filter circuit is small, at this time, the main control circuit outputs a low level (that is, a closed-loop control signal) to the signal input end OPEN _ PWM to control the DC conversion circuit to be in a closed-loop control state, the voltage feedback circuit can normally reflect the voltage condition of the third DC electrical signal, the main control circuit outputs a push-pull PWM signal (that is, a conversion control signal) to the DC-DC conversion circuit according to the voltage feedback signal to control the third DC electrical signal to be stable, and at this time, the duty ratio of the push-pull PWM signal is continuously adjusted to stabilize the third DC electrical signal.
When the current feedback signal reflects that the load condition carried by the direct current conversion circuit is a heavy load, namely the output current of the rectifying and filtering circuit is large, at the moment, the main control circuit outputs a high level (OPEN-loop control signal) to the signal input end OPEN _ PWM to control the direct current conversion circuit to be in an OPEN-loop control state, the OPEN-loop control signal pulls down the level of the non-inverting input end of the operational amplifier IC1 through the switching tube Q2 to shield the voltage feedback of the third direct current signal, so that the main control circuit cannot detect the voltage feedback signal, at the moment, the main control circuit outputs a push-pull PWM signal to the maximum duty ratio for OPEN-loop control because the voltage feedback signal cannot be detected, the maximum duty ratio at the moment is not more than 50%, and the specific value of the maximum duty ratio can; it is worth noting that the third direct current voltage is required to be ensured to be within the design range of the circuit under the open-loop control, and because the push-pull PWM signal is always the maximum duty ratio during the open-loop control, compared with the push-pull PWM signal which is continuously adjusted during the closed-loop control, the open-loop control can fully transfer energy, the maximum utilization rate of the circuit is improved, and the conversion efficiency of the circuit is increased. In addition, the open-loop control scheme is suitable for loads with low voltage error requirements, such as LED lamps and the like, of the direct current conversion circuit.
In addition, the direct current conversion circuit also comprises a power supply circuit which is used for supplying power to the main control circuit, and the power supply circuit can be a power supply circuit formed by three-terminal voltage regulators such as 78L12, 78L05 and the like; or a power supply circuit composed of an isolation transformer and a power management chip (UC3843, UC3844, etc.); the transformer T1 may also be added with a power supply winding in the DC-DC conversion circuit to provide power to the main control circuit. Here, a specific implementation of the power supply circuit is not limited.
Example 2
A dc conversion device comprising the dc conversion circuit of high conversion efficiency described in embodiment 1. The DC conversion device has high conversion efficiency due to the DC conversion circuit with high conversion efficiency. The specific description of the dc conversion circuit refers to embodiment 1, and is not repeated.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (10)
1. A direct current conversion circuit with high conversion efficiency is characterized by comprising a direct current input end, a DC-DC conversion unit, a direct current output end, a voltage feedback circuit for acquiring a voltage feedback signal of the output end of the DC-DC conversion unit, a current feedback circuit for acquiring a current feedback signal of the output end of the DC-DC conversion unit, an open-loop control circuit and a main control circuit; the main control circuit is used for outputting a conversion control signal for controlling the work of the DC-DC conversion unit according to the voltage feedback signal, the main control circuit is used for controlling whether an open-loop control signal is output or not according to the current feedback signal, and the open-loop control circuit is used for interrupting the voltage feedback of the voltage feedback circuit according to the open-loop control signal;
the direct current input end is connected with the input end of the DC-DC conversion unit, the output end of the DC-DC conversion unit is respectively connected with the direct current output end, the input end of the voltage feedback circuit and the input end of the current feedback circuit, the output end of the voltage feedback circuit and the output end of the current feedback circuit are both connected with the input end of the main control circuit, the output end of the main control circuit is connected with the control end of the DC-DC conversion unit to input the conversion control signal, the output end of the main control circuit is connected with the input end of the open-loop control circuit, and the output end of the open-loop control circuit is connected with the input end of the voltage feedback circuit.
2. The direct current conversion circuit with high conversion efficiency according to claim 1, wherein the DC-DC conversion unit comprises a DC-DC conversion circuit and a rectifying and filtering circuit, the direct current input terminal is connected to the input terminal of the DC-DC conversion circuit, the output terminal of the DC-DC conversion circuit is connected to the input terminal of the rectifying and filtering circuit, the output terminal of the rectifying and filtering circuit is respectively connected to the direct current output terminal, the input terminal of the voltage feedback circuit and the input terminal of the current feedback circuit, and the output terminal of the main control circuit is connected to the control terminal of the DC-DC conversion circuit.
3. The high conversion efficiency DC conversion circuit according to claim 2, further comprising an LC resonant circuit, wherein the output terminal of the DC-DC conversion circuit is connected to the input terminal of the rectifying and filtering circuit through the LC resonant circuit.
4. The high conversion efficiency direct current conversion circuit according to claim 2, further comprising a current detection circuit for obtaining a current feedback signal from an input terminal of the DC-DC conversion circuit, wherein the direct current input terminal is connected to the input terminal of the DC-DC conversion circuit through the current detection circuit, and an output terminal of the current detection circuit is connected to an input terminal of the main control circuit.
5. The direct current conversion circuit with high conversion efficiency according to any one of claims 2 to 4, wherein the DC-DC conversion circuit comprises a first power tube, a second power tube and a transformer, a negative end of the direct current input end is connected with a negative output end of the first power tube and a negative output end of the second power tube, and a control end of the first power tube and a control end of the second power tube are respectively used as a control end of the DC-DC conversion circuit; the positive output end of the first power tube is connected with the first input end of the transformer, the positive output end of the second power tube is connected with the second input end of the transformer, the positive end of the direct current input end is connected with the middle input end of the transformer, and the output end of the transformer is connected with the input end of the rectification filter circuit.
6. The DC converter circuit with high conversion efficiency according to claim 5, wherein the first power transistor and/or the second power transistor is an MOS transistor, a gate of the MOS transistor is a control terminal of the power transistor, a source of the MOS transistor is a negative output terminal of the power transistor, and a drain of the MOS transistor is a positive output terminal of the power transistor.
7. The DC converter circuit with high conversion efficiency according to any one of claims 2 to 4, wherein the rectifying and filtering circuit comprises a rectifying bridge and a filtering capacitor, an output end of the DC-DC converter circuit is connected with an input end of the rectifying bridge, an output end of the rectifying bridge is connected with an input end of the filtering capacitor, and an output end of the filtering capacitor is respectively connected with the DC output end, an input end of the voltage feedback circuit and an input end of the current feedback circuit.
8. The DC conversion circuit with high conversion efficiency according to any one of claims 1 to 4, wherein the voltage feedback circuit comprises an operational amplifier and a reference voltage circuit, the output terminal of the DC-DC conversion unit is connected to the non-inverting input terminal of the operational amplifier, the output terminal of the reference voltage circuit is connected to the inverting input terminal of the operational amplifier, and the output terminal of the operational amplifier is connected to the input terminal of the main control circuit.
9. The dc converting circuit with high conversion efficiency according to claim 8, wherein the open-loop control circuit comprises a switch tube and a signal input terminal for receiving the open-loop control signal, the signal input terminal is connected to the control terminal of the switch tube, the positive output terminal of the switch tube is connected to the non-inverting input terminal of the operational amplifier, and the negative output terminal of the switch tube is grounded.
10. A dc conversion device comprising the dc conversion circuit with high conversion efficiency according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921099414.9U CN210075087U (en) | 2019-07-12 | 2019-07-12 | Direct current conversion circuit and direct current conversion device with high conversion efficiency |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921099414.9U CN210075087U (en) | 2019-07-12 | 2019-07-12 | Direct current conversion circuit and direct current conversion device with high conversion efficiency |
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| CN210075087U true CN210075087U (en) | 2020-02-14 |
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| CN201921099414.9U Withdrawn - After Issue CN210075087U (en) | 2019-07-12 | 2019-07-12 | Direct current conversion circuit and direct current conversion device with high conversion efficiency |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110380619A (en) * | 2019-07-12 | 2019-10-25 | 深圳市赛格瑞电子有限公司 | A kind of DC converting circuit and its control method, current/direct-current conversion device |
-
2019
- 2019-07-12 CN CN201921099414.9U patent/CN210075087U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110380619A (en) * | 2019-07-12 | 2019-10-25 | 深圳市赛格瑞电子有限公司 | A kind of DC converting circuit and its control method, current/direct-current conversion device |
| CN110380619B (en) * | 2019-07-12 | 2023-09-29 | 深圳市赛格瑞电子有限公司 | Direct current conversion circuit, control method thereof and direct current conversion device |
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