CN220357479U - Constant current constant voltage control circuit - Google Patents
Constant current constant voltage control circuit Download PDFInfo
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- CN220357479U CN220357479U CN202322097093.1U CN202322097093U CN220357479U CN 220357479 U CN220357479 U CN 220357479U CN 202322097093 U CN202322097093 U CN 202322097093U CN 220357479 U CN220357479 U CN 220357479U
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Abstract
The utility model discloses a constant-current and constant-voltage control circuit, which relates to the field of power supply, and comprises: the power supply module is used for supplying voltage and current; the output module is used for outputting voltage and current; the voltage regulating module is used for sampling the output voltage, comparing the obtained first sampling voltage with a first preset voltage, and outputting a feedback signal to the feedback module when the first sampling voltage is larger than the first preset voltage; the current adjusting module is used for sampling the output current, obtaining a second sampling voltage and comparing the second sampling voltage with a second preset voltage, and outputting a feedback signal to the feedback module when the second sampling voltage is larger than the second preset voltage; the beneficial effects of the utility model are as follows: the utility model has the advantage of cost, the cost of the components selected by the whole circuit is low, and the common conventional components are adopted completely, so that the economic benefit is considerable; the selected devices and materials are all universal, the industrialization of the circuit is easy to realize, the circuit consistency is good, and the method has popularization significance.
Description
Technical Field
The utility model relates to the field of power supply, in particular to a constant-current constant-voltage control circuit.
Background
Constant current and constant voltage power supplies are a common type of power supply in electronics. The device can provide stable voltage and current output, can automatically adjust output current or voltage according to load change, and has high adaptability and stability.
The existing constant voltage and constant current power supply is high in cost and needs improvement.
Disclosure of Invention
The utility model aims to provide a constant-current and constant-voltage control circuit for solving the problems in the background art.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
a constant current constant voltage control circuit comprising:
the power supply module is used for supplying voltage and current;
the output module is used for outputting voltage and current;
the voltage regulating module is used for sampling the output voltage, comparing the obtained first sampling voltage with a first preset voltage, and outputting a feedback signal to the feedback module when the first sampling voltage is larger than the first preset voltage;
the current adjusting module is used for sampling the output current, obtaining a second sampling voltage and comparing the second sampling voltage with a second preset voltage, and outputting a feedback signal to the feedback module when the second sampling voltage is larger than the second preset voltage;
the feedback module is used for isolating and outputting a control signal to the control module after receiving the feedback signal;
the control module is used for adjusting the voltage and the current of the power supply module after receiving the control signal;
the power supply module is connected with the output module, the output module is connected with the voltage regulating module and the current regulating module, the voltage regulating module is connected with the feedback module, the current regulating module is connected with the feedback module, the feedback module is connected with the control module, and the control module is connected with the power supply module.
As still further aspects of the utility model: the voltage regulation module comprises an amplifier IC2A, the output end of the amplifier IC2A is connected with the cathode of a diode D1 and one end of a capacitor C2, the anode of the diode D1 is connected with the feedback module, the other end of the capacitor C2 is connected with the inverting end of the amplifier IC2A, one end of a resistor R3 and one end of a resistor R6, the other end of the resistor R6 is grounded, the other end of the resistor R3 is connected with the output module, and the in-phase end of the amplifier IC2A is connected with a reference voltage VREF.
As still further aspects of the utility model: the current regulation module comprises an amplifier IC2B, wherein the output end of the amplifier IC2B is connected with the cathode of a diode D2 and one end of a capacitor C4, the anode of the diode D2 is connected with a feedback module, the other end of the capacitor C4 is connected with the inverting end of the amplifier IC2B and one end of a resistor R9, the other end of the resistor R9 is connected with one end of a capacitor C6, one end of a resistor R11 and the output module, the other end of the capacitor C6 is grounded, the other end of the resistor R11 is grounded, the in-phase end of the amplifier IC2B is connected with one end of a resistor R12 and one end of a resistor R10, the other end of the resistor R12 is grounded, and the other end of the resistor R10 is connected with one end of a capacitor C5 and a reference voltage VREF.
As still further aspects of the utility model: the feedback module comprises an optocoupler PQ1, wherein the end A of the optocoupler PQ1 is connected with one end of a resistor R5 and one end of a resistor R7, the other end of the resistor R5 is connected with a power supply module, the other end of the resistor R7 is connected with the end K of the optocoupler PQ1, a voltage regulation module and a current regulation module, the end E of the optocoupler PQ1 is grounded, the end C of the optocoupler PQ1 is connected with one end of a capacitor C3, one end of a resistor R4 and a control module, the other end of the resistor R4 is connected with a power supply voltage VCC1, and the other end of the capacitor C3 is grounded.
As still further aspects of the utility model: the power supply module comprises a power supply voltage VIN, a capacitor E1, a capacitor C1 and a resistor R1, wherein the power supply voltage VIN is connected with one end of the capacitor E1, one end of the capacitor C1 and one end of the resistor R1, the other end of the capacitor E1 is grounded, the other end of the capacitor C1 is grounded, and the other end of the resistor R1 is connected with the output module.
Compared with the prior art, the utility model has the beneficial effects that: the utility model has the advantage of cost, the cost of the components selected by the whole circuit is low, and the common conventional components are adopted completely, so that the economic benefit is considerable; the selected devices and materials are all universal, the industrialization of the circuit is easy to realize, the circuit consistency is good, and the method has popularization significance.
Drawings
Fig. 1 is a circuit diagram of a constant current constant voltage control circuit.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present utility model are included in the protection scope of the present utility model.
Referring to fig. 1, a constant current and constant voltage control circuit includes:
the power supply module is used for supplying voltage and current;
the output module is used for outputting voltage and current;
the voltage regulating module is used for sampling the output voltage, comparing the obtained first sampling voltage with a first preset voltage, and outputting a feedback signal to the feedback module when the first sampling voltage is larger than the first preset voltage;
the current adjusting module is used for sampling the output current, obtaining a second sampling voltage and comparing the second sampling voltage with a second preset voltage, and outputting a feedback signal to the feedback module when the second sampling voltage is larger than the second preset voltage;
the feedback module is used for isolating and outputting a control signal to the control module after receiving the feedback signal;
the control module is used for adjusting the voltage and the current of the power supply module after receiving the control signal;
the power supply module is connected with the output module, the output module is connected with the voltage regulating module and the current regulating module, the voltage regulating module is connected with the feedback module, the current regulating module is connected with the feedback module, the feedback module is connected with the control module, and the control module is connected with the power supply module.
In this embodiment: referring to fig. 1, the voltage adjusting module includes an amplifier IC2A, an output end of the amplifier IC2A is connected to a cathode of a diode D1 and one end of a capacitor C2, an anode of the diode D1 is connected to the feedback module, the other end of the capacitor C2 is connected to an inverting end of the amplifier IC2A, one end of a resistor R3 and one end of a resistor R6, the other end of the resistor R6 is grounded, the other end of the resistor R3 is connected to the output module, and an in-phase end of the amplifier IC2A is connected to a reference voltage VREF.
The output voltage VOUT of the output module is divided and arranged through resistors R3 and R6, the resistor R6 is used as a sampling resistor, the upper voltage is the sampling voltage, when the output voltage is too high, the voltage of the reverse end of the amplifier IC2A is higher than the fixed reference voltage VREF at the same direction end, so that the voltage of the output end of the amplifier IC2A is pulled down, the optocoupler PQ1 is conducted, the C pin level of the optocoupler PQ1 is changed from high to low, and the carrier frequency is adjusted by a control chip fed back to the control module (the carrier frequency is adjusted by receiving signals in the prior art), so that the voltage of the power supply module is adjusted, and negative feedback is formed.
In this embodiment: referring to fig. 1, the current adjusting module includes an amplifier IC2B, an output end of the amplifier IC2B is connected to a cathode of a diode D2 and one end of a capacitor C4, an anode of the diode D2 is connected to the feedback module, the other end of the capacitor C4 is connected to an inverting end of the amplifier IC2B and one end of a resistor R9, the other end of the resistor R9 is connected to one end of a capacitor C6, one end of a resistor R11 and the output module, the other end of the capacitor C6 is grounded, the other end of the resistor R11 is grounded, an in-phase end of the amplifier IC2B is connected to one end of a resistor R12 and one end of a resistor R10, the other end of the resistor R12 is grounded, and the other end of the resistor R10 is connected to one end of a capacitor C5 and a reference voltage VREF, and the other end of the capacitor C5 is grounded.
The output current of the output module is grounded through a resistor R11, the voltage on the resistor R11 reflects the current information of the output module, the current information is output to the inverting terminal of the amplifier IC2B through a resistor R9, when the current is overlarge, the voltage of the inverting terminal of the amplifier IC2B is higher than the voltage of the non-inverting terminal, the amplifier IC2B outputs a low level, so that the optocoupler PQ1 is conducted, the level of the C pin of the optocoupler PQ1 is changed from high to low, and the carrier frequency is adjusted by feeding back to a control chip of the control module, so that the voltage of the power supply module is adjusted, and negative feedback is formed.
In this embodiment: referring to fig. 1, the feedback module includes an optocoupler PQ1, an a end of the optocoupler PQ1 is connected to one end of a resistor R5, one end of a resistor R7, the other end of the resistor R5 is connected to a power supply module, the other end of the resistor R7 is connected to a K end of the optocoupler PQ1, a voltage regulation module and a current regulation module, an E end of the optocoupler PQ1 is grounded, a C end of the optocoupler PQ1 is connected to one end of a capacitor C3, one end of a resistor R4 and a control module, the other end of the resistor R4 is connected to a power supply voltage VCC1, and the other end of the capacitor C3 is grounded.
When the output voltage and the output current of the output module are normal, the amplifier IC2A, IC B outputs a high level, so that the AK side of the optocoupler PQ1 is not conducted, and the CE side is not conducted; when at least one of the output voltage and the output current of the output module is abnormal, the K end of the optocoupler PQ1 is changed into a low level, the AK side is conducted, the CE side is further conducted, the C end is changed from a high level to a low level, a low level signal is transmitted to the control module, and the control chip of the control module adjusts the carrier frequency, so that the voltage of the power supply module is adjusted.
In this embodiment: referring to fig. 1, the power supply module includes a power supply voltage VIN, a capacitor E1, a capacitor C1, and a resistor R1, where the power supply voltage VIN is connected to one end of the capacitor E1, one end of the capacitor C1, one end of the resistor R1, the other end of the capacitor E1 is grounded, the other end of the capacitor C1 is grounded, and the other end of the resistor R1 is connected to the output module.
The control module adjusts the carrier frequency and finally adjusts the power supply voltage VIN so as to adjust the voltage and the current of the output module.
The working principle of the utility model is as follows: the power supply module is used for supplying voltage and current; the output module is used for outputting voltage and current; the voltage regulating module is used for sampling the output voltage, obtaining a first sampling voltage and comparing the first sampling voltage with a first preset voltage, and outputting a feedback signal to the feedback module when the first sampling voltage is larger than the first preset voltage; the current regulating module is used for sampling the output current, obtaining a second sampling voltage and comparing the second sampling voltage with a second preset voltage, and outputting a feedback signal to the feedback module when the second sampling voltage is larger than the second preset voltage; the feedback module is used for isolating and outputting a control signal to the control module after receiving the feedback signal; the control module is used for adjusting the voltage and the current of the power supply module after receiving the control signal.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (5)
1. A constant current and constant voltage control circuit, characterized in that:
the constant current and constant voltage control circuit includes:
the power supply module is used for supplying voltage and current;
the output module is used for outputting voltage and current;
the voltage regulating module is used for sampling the output voltage, comparing the obtained first sampling voltage with a first preset voltage, and outputting a feedback signal to the feedback module when the first sampling voltage is larger than the first preset voltage;
the current adjusting module is used for sampling the output current, obtaining a second sampling voltage and comparing the second sampling voltage with a second preset voltage, and outputting a feedback signal to the feedback module when the second sampling voltage is larger than the second preset voltage;
the feedback module is used for isolating and outputting a control signal to the control module after receiving the feedback signal;
the control module is used for adjusting the voltage and the current of the power supply module after receiving the control signal;
the power supply module is connected with the output module, the output module is connected with the voltage regulating module and the current regulating module, the voltage regulating module is connected with the feedback module, the current regulating module is connected with the feedback module, the feedback module is connected with the control module, and the control module is connected with the power supply module.
2. The constant current and constant voltage control circuit according to claim 1, wherein the voltage adjusting module comprises an amplifier IC2A, an output terminal of the amplifier IC2A is connected to a cathode of a diode D1 and one end of a capacitor C2, an anode of the diode D1 is connected to the feedback module, the other end of the capacitor C2 is connected to an inverting terminal of the amplifier IC2A, one end of a resistor R3, one end of a resistor R6, the other end of the resistor R6 is grounded, the other end of the resistor R3 is connected to the output module, and an in-phase terminal of the amplifier IC2A is connected to a reference voltage VREF.
3. The constant-current and constant-voltage control circuit according to claim 1, wherein the current adjusting module comprises an amplifier IC2B, an output terminal of the amplifier IC2B is connected to a negative electrode of a diode D2 and one end of a capacitor C4, an anode of the diode D2 is connected to the feedback module, the other end of the capacitor C4 is connected to an inverting terminal of the amplifier IC2B and one end of a resistor R9, the other end of the resistor R9 is connected to one end of a capacitor C6, one end of a resistor R11 and the output module, the other end of the capacitor C6 is grounded, the other end of the resistor R11 is grounded, an in-phase terminal of the amplifier IC2B is connected to one end of a resistor R12 and one end of a resistor R10, the other end of the resistor R12 is grounded, the other end of the resistor R10 is connected to one end of a capacitor C5 and a reference voltage VREF, and the other end of the capacitor C5 is grounded.
4. The constant current and constant voltage control circuit according to claim 2 or 3, wherein the feedback module comprises an optocoupler PQ1, an a end of the optocoupler PQ1 is connected with one end of a resistor R5 and one end of a resistor R7, the other end of the resistor R5 is connected with the power supply module, the other end of the resistor R7 is connected with a K end of the optocoupler PQ1, the voltage regulating module and the current regulating module, an E end of the optocoupler PQ1 is grounded, a C end of the optocoupler PQ1 is connected with one end of a capacitor C3, one end of a resistor R4 and the control module, the other end of the resistor R4 is connected with a power supply voltage VCC1, and the other end of the capacitor C3 is grounded.
5. The constant-current and constant-voltage control circuit according to claim 1, wherein the power supply module comprises a power supply voltage VIN, a capacitor E1, a capacitor C1 and a resistor R1, the power supply voltage VIN is connected to one end of the capacitor E1, one end of the capacitor C1 and one end of the resistor R1, the other end of the capacitor E1 is grounded, the other end of the capacitor C1 is grounded, and the other end of the resistor R1 is connected to the output module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322097093.1U CN220357479U (en) | 2023-08-07 | 2023-08-07 | Constant current constant voltage control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322097093.1U CN220357479U (en) | 2023-08-07 | 2023-08-07 | Constant current constant voltage control circuit |
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| Publication Number | Publication Date |
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| CN220357479U true CN220357479U (en) | 2024-01-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202322097093.1U Active CN220357479U (en) | 2023-08-07 | 2023-08-07 | Constant current constant voltage control circuit |
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- 2023-08-07 CN CN202322097093.1U patent/CN220357479U/en active Active
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