CN216819708U - Power supply conversion circuit - Google Patents
Power supply conversion circuit Download PDFInfo
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- CN216819708U CN216819708U CN202123056664.4U CN202123056664U CN216819708U CN 216819708 U CN216819708 U CN 216819708U CN 202123056664 U CN202123056664 U CN 202123056664U CN 216819708 U CN216819708 U CN 216819708U
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Abstract
The utility model provides a power conversion circuit, comprising: the device comprises a power supply, a protection module, a voltage transformation module and a conversion output module; the power supply is used for generating a first voltage; the protection module is connected with the output end of the power supply and is used for limiting the voltage or the current output by the power supply; the input end of the voltage transformation module is respectively connected with the protection module and the output end of the power supply and is used for carrying out voltage conversion on the first voltage to obtain a second voltage; and the input end of the conversion output module is connected with the output end of the voltage transformation module and is used for converting and adjusting the second voltage to obtain a target voltage. The problem that the power supply cost for loads with different polarities by adopting two independent power supplies in the prior art is high is solved, the cost is saved, and the user requirements are met.
Description
Technical Field
The utility model relates to the technical field of electronics, in particular to a power conversion circuit.
Background
In practical applications, some loads require both a positive and a negative power supply to power them. In the prior art, a power conversion chip can only convert a positive power supply into a positive power supply and convert a negative power supply into a negative power supply, so that two independent positive power supplies and two independent negative power supplies are needed to supply power to a load simultaneously.
However, the power supply mode adopts two independent power supplies, which are high in cost, unstable and incapable of meeting the requirements of users.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model provides a power supply conversion circuit, which solves the problem that the power supply cost of two independent power supplies for loads with different polarities is high in the prior art.
A power conversion circuit, comprising: the device comprises a power supply, a protection module, a voltage transformation module and a conversion output module; the power supply is used for outputting a first voltage; the input end of the voltage transformation module is connected with the output end of the power supply and is used for performing voltage conversion on the first voltage to obtain a second voltage; the protection module is respectively connected with the output end of the power supply and the input end of the transformation module and is used for limiting voltage or current for the transformation module; and the input end of the conversion output module is connected with the output end of the voltage transformation module and is used for converting and adjusting the second voltage to obtain a target voltage.
Optionally, the conversion output module is a sliding rheostat, a first end of the sliding rheostat is connected with the first output end of the voltage transformation module, a sliding end of the sliding rheostat is connected with the second output end of the voltage transformation module, and a second end of the sliding rheostat is grounded.
Optionally, the transformation module comprises a transformation chip and a pull-up resistor; and the first end of the pull-up resistor is connected with the power supply, and the second end of the pull-up resistor is connected with the transformer chip and used for introducing the first voltage to enable the transformer chip to be conducted.
Optionally, the voltage transformation module further comprises: a follow current unit; and the first end of the follow current unit is connected with the transformation chip, and the second end of the follow current unit is grounded and used for stabilizing the second voltage output by the transformation module.
Optionally, the freewheel unit includes: a first diode and a first inductor; the cathode of the first diode is connected with the transformer chip, and the anode of the first diode is grounded; the first inductor is connected in parallel with the first diode.
Optionally, the protection module comprises: a current protection unit and a switching unit; the first end of the switch unit is connected with the second end of the pull-up resistor, and the second end of the switch unit is grounded and used for sending a switch signal to cut off or switch on the transformer chip; the first end of the current protection unit is connected with the power supply, and the second end of the current protection unit is grounded; and the third end of the current protection unit is connected with the third end of the switch unit and is used for triggering the switch unit to send out a switch signal.
Optionally, the protection module comprises: a voltage protection unit and a switching unit; the first end of the switch unit is connected with the second end of the pull-up resistor, and the second end of the switch unit is grounded and used for sending a switch signal to cut off or switch on the transformer chip; the first end of the voltage protection unit is connected with the power supply, the second end of the voltage protection unit is grounded, and the third end of the voltage protection unit is connected with the third end of the switch unit and used for triggering the switch unit to send out a switch signal.
Optionally, the protection module comprises: the device comprises a current protection unit, a voltage protection unit and a switch unit; the first end of the switch unit is connected with the second end of the pull-up resistor, and the second end of the switch unit is grounded and used for sending a switch signal to cut off or switch on the transformer chip; the first end of the current protection unit is connected with the power supply, and the second end of the current protection unit is grounded; the third end of the current protection unit is connected with the third end of the switch unit and is used for triggering the switch unit to send out a switch signal; the first end of the voltage protection unit is connected with the power supply, the second end of the voltage protection unit is grounded, and the third end of the voltage protection unit is connected with the third end of the switch unit and used for triggering the switch unit to send out a switching signal.
Optionally, the switching unit is a first triode; the current protection unit includes: the first triode is connected with the first resistor; two ends of the third resistor are respectively connected with the anode of the first voltage stabilizing diode and grounded; the cathode of the first voltage stabilizing diode is connected with the base electrode of the second triode; an emitting electrode of the second triode is connected with the power supply, and a collector electrode of the second triode is connected with a first end of the fourth resistor; the second end of the fourth resistor is connected with the base electrode of the first triode; and the collector electrode of the first triode is connected with the transformer chip, and the emitter electrode of the first triode is grounded.
Optionally, the switch unit is a first triode; the voltage protection unit includes: a second zener diode, a fifth resistor, and a third diode; the negative electrode of the second voltage stabilizing diode is connected with the power supply, and the first end of the fifth resistor of the second voltage stabilizing diode is connected; a second end of the fifth resistor is connected with a base electrode of the third diode; and the collector of the third diode is connected with the base of the first triode, and the emitter of the third diode is grounded.
Compared with the prior art, the utility model has the following beneficial effects:
the voltage generated by the power supply is transformed through the transformation module, the first voltage is converted into the second voltage to reach the level of the power supply voltage required by the rear-stage load, the polarity of the second voltage is converted through the conversion output module, the amplitude is adjusted, the target voltage is obtained, the polarity of the target voltage output by the target voltage is opposite to that of the first voltage, the amplitude of the target voltage output by the target voltage is the amplitude required by the load, and the power supply for the loads requiring different polarities and different amplitudes can be realized by adopting the same power supply; and the circuit is protected by the protection module, so that the target voltage can be safely output, the cost is saved, and the user requirements are met.
Drawings
FIG. 1 is a block diagram of a power conversion circuit according to an embodiment of the utility model;
FIG. 2 is a circuit diagram of a power conversion circuit according to an embodiment of the utility model;
FIG. 3 is a circuit diagram of a protection module according to an embodiment of the present invention;
FIG. 4 is another circuit diagram of a protection module according to an embodiment of the present invention;
FIG. 5 is a further circuit diagram of a protection module according to an embodiment of the present invention;
fig. 6 is another circuit diagram of the power conversion circuit according to the embodiment of the utility model.
Detailed Description
The technical solution of the present invention is further explained with reference to the drawings and the embodiments.
Example one
Fig. 1 is a structural diagram of a power conversion circuit according to an embodiment of the present invention, and as shown in fig. 1, the power conversion circuit 100 includes a power supply 100, a protection module 200, a voltage transformation module 300, and a conversion output module 400;
the power supply 100 is configured to output a first voltage; the input end of the voltage transformation module 300 is connected to the output end of the power supply 100, and is configured to perform voltage conversion on the first voltage to obtain a second voltage; the protection module 200 is respectively connected to the output terminal of the power supply 100 and the input terminal of the transformer module 300, and is configured to limit voltage or current for the transformer module 300; the input end of the conversion output module 400 is connected to the output end of the voltage transformation module 300, and is configured to convert and regulate the second voltage to obtain a target voltage.
The working principle of the embodiment is as follows: the power supply 100 generates a first voltage, the voltage transformation module 300 steps up or down the first voltage to a voltage level required by a rear-stage load to obtain a second voltage, the polarity of the second voltage is converted by the conversion output module 400, and the amplitude of the second voltage can be adjusted by the conversion output module 400 to obtain a target voltage, so that the target voltage can meet load requirements of different power supply voltage amplitudes, and the target voltage range can be adjusted. When overvoltage or overcurrent occurs, the voltage or current output by the power supply 100 is limited or limited by the protection module 200, and the protection transformation module 300 is damaged due to the overvoltage or the multiple currents, so that the target voltage can be safely output.
Example two
Fig. 2 is a circuit diagram of a power conversion circuit according to an embodiment of the utility model, and as shown in fig. 2, the conversion output module 400 is a slide rheostat R1, a first end of the slide rheostat R1 is connected to a first output end of the transformation module 300, a sliding end of the slide rheostat R1 is connected to a second output end of the transformation module 300, and a second end of the slide rheostat R1 is grounded. The sliding end of the slide rheostat R1 is adjusted to adjust the resistance value of the slide rheostat R1, so that the output range of the target voltage is changed.
The transformation module 300 comprises a transformation chip and a pull-up resistor R2; a first end of the pull-up resistor R2 is connected to the power supply 100, and a second end of the pull-up resistor R2 is connected to the transformer chip, so as to introduce the first voltage to turn on the transformer chip. The input end of the transformer chip is clamped at a high level through a pull-up resistor R2, so that the transformer chip is kept conductive. The voltage transformation chip can be a voltage boosting chip or a voltage reducing chip, the type of the voltage transformation chip can be LM2576, and the specific type and the type of the voltage transformation chip can be set according to the actual needs of the rear-stage load.
The transformation module 300 further includes: a freewheel unit 310; a first end of the freewheeling unit 310 is connected to the transformer chip, and a second end of the freewheeling unit 310 is grounded, so as to stabilize the second voltage output by the transformer module 300. The freewheel unit 310 includes: a first diode D1 and a first inductor L1; the cathode of the first diode D1 is connected with the transformer chip, and the anode of the first diode D1 is grounded; the first inductor L1 is connected in parallel with the first diode D1.
EXAMPLE III
Fig. 3 is a circuit diagram of a protection module according to an embodiment of the present invention, and as shown in fig. 3, the protection module 200 includes: a current protection unit and a switching unit; the first end of the switch unit is connected with the second end of the pull-up resistor R2, and the second end of the switch unit is grounded and used for sending a switch signal to enable the transformer chip to be switched off or switched on; a first end of the current protection unit is connected with the power supply 100, and a second end of the current protection unit is grounded; and the third end of the current protection unit is connected with the third end of the switch unit and is used for triggering the switch unit to send out a switch signal.
When no overcurrent is generated in the circuit, the current protection unit does not act, the switch unit is not triggered, a turn-off signal is sent out, the input end of the voltage transformation chip maintains a high-level signal, and the voltage transformation chip is kept on; when overcurrent is generated in the circuit, the current protection unit acts, the switch unit is triggered to send out a closing signal, the input end of the voltage transformation chip is grounded and receives a low level signal, the voltage transformation chip is cut off, and the circuit stops working, so that the current protection of the power supply 100 is realized.
The switch unit is a first triode Q1; the current protection unit includes: the circuit comprises a third resistor R3, a first voltage-stabilizing diode S1, a second triode Q2 and a fourth resistor R4; two ends of the third resistor R3 are respectively connected with the anode of the first voltage-stabilizing diode S1 and grounded; the cathode of the first voltage-stabilizing diode S1 is connected with the base of the second triode Q2; the emitter of the second transistor Q2 is connected to the power supply 100, and the collector of the second transistor Q2 is connected to the first end of the fourth resistor R4; a second end of the fourth resistor R4 is connected with the base of the first triode Q1; the collector of the first triode Q1 is connected with the transformer chip, and the emitter of the first triode Q1 is grounded.
The working principle of the embodiment is as follows: when the voltage of the power supply 100 is too small, the power supply 100 may output a large current, and when the current is too large, heat may be generated to damage the circuit, so the voltage of the power supply 100 is monitored by setting the voltage turn-on value of the first zener diode S1, thereby preventing a large current from being generated in the circuit. When the voltage of the power supply 100 is smaller than the conduction voltage value of the first voltage-stabilizing diode S1, the first voltage-stabilizing diode S1 is turned on, the base of the second triode Q2 is grounded through the first voltage-stabilizing diode S1 and the first resistor and receives a low-level signal, the second triode Q2 is turned on, the first triode Q1 is connected to the first voltage output by the power supply 100 through the fourth resistor R4 and the second triode Q2 and receives a high-level signal, the first triode Q1 is turned on, the input end of the transformer chip is grounded through the first triode Q1 and receives a low-level signal, the transformer chip is turned off and stops working, and therefore the whole circuit is controlled to stop working, and the purpose of protecting the circuit is achieved.
Example four
Fig. 4 is another circuit diagram of a protection module according to an embodiment of the present invention, and as shown in fig. 4, the protection module 200 includes: a voltage protection unit and a switching unit; the first end of the switch unit is connected with the second end of the pull-up resistor R2, and the second end of the switch unit is grounded and used for sending a switch signal to enable the transformer chip to be switched off or switched on; the first end of the voltage protection unit is connected with the power supply 100, the second end of the voltage protection unit is grounded, and the third end of the voltage protection unit is connected with the third end of the switch unit and used for triggering the switch unit to send out a switch signal.
When no overvoltage is generated in the circuit, the voltage protection unit does not act, the switch unit is not triggered, a turn-off signal is sent out, the input end of the voltage transformation chip maintains a high-level signal, and the voltage transformation chip is kept on; when overvoltage is generated in the circuit, the voltage protection unit acts, the switch unit is triggered to send out a closing signal, the input end of the voltage transformation chip is grounded and receives a low level signal, the voltage transformation chip is cut off, and the circuit stops working, so that voltage protection of the power supply 100 is realized.
The switch unit is a first triode Q1; the voltage protection unit includes: a second zener diode S2, a fifth resistor R5, and a third diode Q3; the cathode of the second zener diode S2 is connected to the power supply 100, and the first end of the fifth resistor R5 of the second zener diode S2 is connected; a second end of the fifth resistor R5 is connected with the base of the third diode Q3; the collector of the third diode Q3 is connected to the base of the first transistor Q1, and the emitter of the third diode Q3 is grounded.
The working principle of the utility model is as follows: when the voltage output by the power supply 100 exceeds the voltage of the second zener diode S2, the second zener diode S2 is turned on, the base of the third diode Q3 is connected to the first voltage output by the power supply 100 through the second zener diode S2 and the fifth resistor R5 and receives a high level signal, the third diode Q3 is turned on, the base of the first triode Q1 receives the high level signal through the third diode Q3, the first triode Q1 is turned on, the voltage transformation chip is grounded through the first triode Q1 and receives a low level signal, the voltage transformation chip is turned off, and the circuit stops working, so that the voltage control of the output of the power supply 100 is realized.
EXAMPLE five
Fig. 5 is a further circuit diagram of a protection module according to an embodiment of the present invention, and as shown in fig. 5, the protection module 200 includes: the device comprises a current protection unit, a voltage protection unit and a switch unit; the first end of the switch unit is connected with the second end of the pull-up resistor R2, and the second end of the switch unit is grounded and used for sending a switch signal to enable the transformer chip to be cut off or switched on; a first end of the current protection unit is connected with the power supply 100, and a second end of the current protection unit is grounded; the third end of the current protection unit is connected with the third end of the switch unit and is used for triggering the switch unit to send out a switch signal; the first end of the voltage protection unit is connected with the power supply 100, the second end of the voltage protection unit is grounded, and the third end of the voltage protection unit is connected with the third end of the switch unit and used for triggering the switch unit to send out a switching signal.
The switch unit is a first triode Q1;
the current protection unit includes: the circuit comprises a third resistor R3, a first voltage-stabilizing diode S1, a second triode Q2 and a fourth resistor R4; two ends of the third resistor R3 are respectively connected with the anode of the first voltage-stabilizing diode S1 and grounded; the cathode of the first voltage-stabilizing diode S1 is connected with the base of the second triode Q2; the emitter of the second transistor Q2 is connected to the power supply 100, and the collector of the second transistor Q2 is connected to the first end of the fourth resistor R4; a second end of the fourth resistor R4 is connected with the base of the first triode Q1; the collector of the first triode Q1 is connected with the transformer chip, and the emitter of the first triode Q1 is grounded;
the voltage protection unit includes: a second zener diode S2, a fifth resistor R5, and a third diode Q3; the cathode of the second zener diode S2 is connected to the power supply 100, and the first end of the fifth resistor R5 of the second zener diode S2 is connected; a second end of the fifth resistor R5 is connected with the base of the third diode Q3; the collector of the third diode Q3 is connected to the base of the first transistor Q1, and the emitter of the third diode Q3 is grounded.
It should be noted that, the current protection unit and the voltage protection unit are both connected to the switch unit, and when an overvoltage or an overcurrent occurs, the input terminal of the transformer chip is grounded and receives a low-level signal by triggering the conduction of the first transistor Q1, so that the transformer chip is turned off. The working principle of the current unit and the voltage protection unit is the same as that of the fifth embodiment and the sixth embodiment, and the description thereof is omitted.
Example six
Fig. 6 is another circuit diagram of the power conversion circuit according to the embodiment of the utility model, as shown in fig. 6, the power conversion circuit 100 further includes a second diode D2, an anode of the second diode D2 is connected to the second end of the sliding varistor R1, and a cathode of the second diode D2 is connected to the first end of the sliding varistor R1, for preventing reverse connection. The power supply 100 conversion circuit further comprises a first capacitor C1, a second capacitor C2 and a third capacitor C3; two ends of the first capacitor C1 are respectively connected to the power supply 100 and ground, and are used for filtering the power supply 100 to stabilize the output first voltage; two ends of the second capacitor C2 are respectively connected with the first end and the second end of the sliding rheostat R1, the third capacitor C3 is connected in parallel with the second capacitor C2, and the first capacitor C1 and the second capacitor C2 are used for filtering the output target voltage, so that the output target voltage is more stable.
EXAMPLE seven
In the embodiment of the utility model, the power supply 100 is positive-polarity voltage, the voltage range of the power supply 100 is 4.5V to 30V, the conduction voltage value of the first zener diode S1 is less than 3.9V, the conduction value of the second zener diode S2 is greater than 33V, the voltage transformation chip is a voltage reduction chip, the model of the chip is LM2576, and the adjustable range of the output value of the target voltage is-1.3V to-25V.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the utility model as defined in the appended claims.
Claims (10)
1. A power conversion circuit, comprising: the device comprises a power supply, a protection module, a voltage transformation module and a conversion output module;
the power supply is used for outputting a first voltage;
the input end of the voltage transformation module is connected with the output end of the power supply and is used for performing voltage conversion on the first voltage to obtain a second voltage;
the protection module is respectively connected with the output end of the power supply and the input end of the transformation module and is used for limiting voltage or current for the transformation module;
and the input end of the conversion output module is connected with the output end of the voltage transformation module and is used for converting and adjusting the second voltage to obtain a target voltage.
2. The power conversion circuit of claim 1, wherein the conversion output module is a slide rheostat, a first end of the slide rheostat is connected to the first output end of the transformation module, a sliding end of the slide rheostat is connected to the second output end of the transformation module, and a second end of the slide rheostat is grounded.
3. The power conversion circuit of claim 1, wherein the transformer module comprises a transformer chip and a pull-up resistor;
and the first end of the pull-up resistor is connected with the power supply, and the second end of the pull-up resistor is connected with the transformer chip and used for introducing the first voltage to enable the transformer chip to be conducted.
4. The power conversion circuit of claim 3, wherein the voltage transformation module further comprises: a follow current unit;
and the first end of the follow current unit is connected with the transformation chip, and the second end of the follow current unit is grounded and used for stabilizing the second voltage output by the transformation module.
5. The power conversion circuit of claim 4, wherein the freewheeling unit comprises: a first diode and a first inductor;
the cathode of the first diode is connected with the transformer chip, and the anode of the first diode is grounded;
the first inductor is connected in parallel with the first diode.
6. The power conversion circuit of claim 3, wherein the protection module comprises: a current protection unit and a switching unit;
the first end of the switch unit is connected with the second end of the pull-up resistor, and the second end of the switch unit is grounded and used for sending a switch signal to cut off or switch on the transformer chip;
the first end of the current protection unit is connected with the power supply, and the second end of the current protection unit is grounded; and the third end of the current protection unit is connected with the third end of the switch unit and is used for triggering the switch unit to send out a switch signal.
7. The power conversion circuit of claim 3, wherein the protection module comprises: a voltage protection unit and a switching unit;
the first end of the switch unit is connected with the second end of the pull-up resistor, and the second end of the switch unit is grounded and used for sending a switch signal to cut off or switch on the transformer chip;
the first end of the voltage protection unit is connected with the power supply, the second end of the voltage protection unit is grounded, and the third end of the voltage protection unit is connected with the third end of the switch unit and used for triggering the switch unit to send out a switching signal.
8. The power conversion circuit of claim 3, wherein the protection module comprises: the device comprises a current protection unit, a voltage protection unit and a switch unit;
the first end of the switch unit is connected with the second end of the pull-up resistor, and the second end of the switch unit is grounded and used for sending a switch signal to cut off or switch on the transformer chip;
the first end of the current protection unit is connected with the power supply, and the second end of the current protection unit is grounded; the third end of the current protection unit is connected with the third end of the switch unit and is used for triggering the switch unit to send out a switch signal;
the first end of the voltage protection unit is connected with the power supply, the second end of the voltage protection unit is grounded, and the third end of the voltage protection unit is connected with the third end of the switch unit and used for triggering the switch unit to send out a switch signal.
9. The power conversion circuit according to claim 6 or 8, wherein the switching unit is a first transistor;
the current protection unit includes: the first triode is connected with the first resistor;
two ends of the third resistor are respectively connected with the anode of the first voltage stabilizing diode and grounded;
the cathode of the first voltage stabilizing diode is connected with the base electrode of the second triode;
an emitting electrode of the second triode is connected with the power supply, and a collector electrode of the second triode is connected with a first end of the fourth resistor;
the second end of the fourth resistor is connected with the base electrode of the first triode;
and the collector electrode of the first triode is connected with the transformer chip, and the emitter electrode of the first triode is grounded.
10. The power conversion circuit according to claim 7 or 8, wherein the switching unit is a first transistor;
the voltage protection unit includes: a second zener diode, a fifth resistor, and a third diode;
the negative electrode of the second voltage stabilizing diode is connected with the power supply, and the first end of the fifth resistor of the second voltage stabilizing diode is connected;
a second end of the fifth resistor is connected with a base electrode of the third diode;
and the collector of the third diode is connected with the base of the first triode, and the emitter of the third diode is grounded.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123056664.4U CN216819708U (en) | 2021-12-07 | 2021-12-07 | Power supply conversion circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123056664.4U CN216819708U (en) | 2021-12-07 | 2021-12-07 | Power supply conversion circuit |
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| CN216819708U true CN216819708U (en) | 2022-06-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115497277A (en) * | 2022-09-13 | 2022-12-20 | 江苏万邦微电子有限公司 | Signal transmission device and method based on negative power system |
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2021
- 2021-12-07 CN CN202123056664.4U patent/CN216819708U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115497277A (en) * | 2022-09-13 | 2022-12-20 | 江苏万邦微电子有限公司 | Signal transmission device and method based on negative power system |
| CN115497277B (en) * | 2022-09-13 | 2023-11-03 | 江苏万邦微电子有限公司 | Signal transmission device and method based on negative power supply system |
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