CN211628105U - Simplified constant-voltage constant-current control circuit - Google Patents
Simplified constant-voltage constant-current control circuit Download PDFInfo
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- CN211628105U CN211628105U CN202020760558.0U CN202020760558U CN211628105U CN 211628105 U CN211628105 U CN 211628105U CN 202020760558 U CN202020760558 U CN 202020760558U CN 211628105 U CN211628105 U CN 211628105U
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Abstract
The utility model discloses a simplify constant voltage constant current control circuit, its voltage current reading that will set for through the comparator does the comparison with the actual voltage current reading of exporting of charger, is adjusted the duty cycle through the opto-coupler feedback by 431 voltage stabilizing circuit again to realize the dynamic balance of constant voltage constant current. The utility model discloses can avoid its output voltage/electric current too high or low excessively of charger in the use.
Description
Technical Field
The utility model relates to a be applied to intelligent charger's simplification constant voltage constant current control circuit.
Background
Nowadays, automobiles are more and more widely popularized, automobile batteries are also particularly important as automobile initial power sources, and the intelligent automobile charger can effectively prolong the service life of the automobile batteries. The intelligent charger is used for maintaining the battery, whether the voltage and the current output by the charger are stable and controllable is very important, if the voltage and the current output by the charger are too high, the battery can be damaged, and if the voltage and the current output by the charger are too low, the battery cannot be fully charged.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a simplify constant voltage constant current control circuit is provided, it can avoid its output voltage/electric current of charger in the use too high or low excessively.
In order to solve the technical problem, the utility model provides a simplified constant voltage and constant current control circuit, it includes sampling end, MCU, comparator, triode, controllable accurate steady voltage source, opto-coupler, first resistance, second resistance, third resistance and power chip, power chip is used for the output voltage/electric current of adjusting device, and the sampling end is used for the output voltage/electric current of sampling device;
the MCU is provided with a first port and a second port;
the comparator is provided with a first input end, a second input end and an output end;
the sampling end is electrically connected with the first input end of the comparator, the first port of the MCU is electrically connected with the second input end of the comparator, the output end of the comparator is electrically connected with the base electrode of the triode, the collector electrode of the triode is electrically connected with the reference electrode of the controllable precise voltage-stabilizing source, and the emitter electrode of the triode is grounded;
the anode of the controllable precise voltage-stabilizing source is grounded, the cathode of the controllable precise voltage-stabilizing source is connected with the cathode of the primary side diode of the optocoupler, the anode of the primary side diode of the optocoupler is electrically connected with the first end of the first resistor, the second end of the first resistor is electrically connected with the switching power supply, one end of the second resistor is electrically connected with the second end of the first resistor, the other end of the second resistor is electrically connected with one end of the third resistor, the other end of the third resistor is electrically connected with the anode of the controllable precise voltage-stabilizing source, and the connection point of the second resistor and the third resistor is respectively electrically connected with the reference electrode of the controllable precise voltage-stabilizing source and the second port of the MCU;
the emitter of the secondary transistor of the optical coupler is grounded, and the collector of the secondary diode of the optical coupler is electrically connected with the power chip.
Preferably, the primary side diode of the optocoupler is connected in parallel with a fourth resistor.
Preferably, the simplified constant-voltage constant-current control circuit further comprises a fifth resistor and a first capacitor, a connection point between the first port of the MCU and the second input terminal of the comparator is electrically connected to one end of the fifth resistor and one end of the first capacitor, and the other end of the fifth resistor and the other end of the first capacitor are both grounded.
Preferably, a second capacitor is connected between the collector and the emitter of the secondary transistor of the optocoupler.
Preferably, the simplified constant-voltage constant-current control circuit further comprises a sixth resistor and a third capacitor, and the sixth resistor and the third capacitor are connected in series and then connected in parallel between the second input end of the comparator and the output end of the comparator.
After the structure more than adopting, compared with the prior art, the utility model, have following advantage:
the utility model discloses a voltage and current reading that the comparator will set for and the actual voltage and current reading of exporting of charger are compared, are adjusted the duty cycle through the opto-coupler feedback by 431 voltage stabilizing circuit again to realize the dynamic balance of constant voltage constant current.
Drawings
Fig. 1 is a schematic diagram of the circuit structure of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Shown by fig. 1, the utility model discloses a simplify constant voltage constant current control circuit, other including sampling end CS, MCU, comparator U1, triode Q1, controllable accurate steady voltage source U3, opto-coupler U2, first resistance R1, second resistance R2, third resistance R11 and power chip, power chip is used for adjusting the output voltage/electric current of charger, and sampling end CS is used for the output voltage/electric current of sampling charger.
The MCU has a first port and a second port.
The comparator U1 has a first input terminal that is a non-inverting input terminal, a second input terminal that is an inverting input terminal, and an output terminal.
The sampling end CS is electrically connected with a first input end of a comparator U1, a first port of the MCU is electrically connected with a second input end of a comparator U1, one end of an output end resistor R4 of the comparator U1 is electrically connected, the other end of the resistor R4 is electrically connected with a base electrode of a triode Q1, a collector electrode of the triode Q1 is electrically connected with a reference electrode of a controllable precision voltage-stabilizing source U3, an emitter electrode of the triode Q1 is grounded, a resistor R9 is connected between the collector electrode of the triode Q1 and the reference electrode of the controllable precision voltage-stabilizing source U3 in series, and the base electrode of the triode Q1 is grounded through a resistor R12.
The anode of the controllable precise voltage-stabilizing source U3 is grounded, the cathode of the controllable precise voltage-stabilizing source U3 is electrically connected with the cathode of the primary diode of the optocoupler U2, the anode of the primary diode of the optocoupler U2 is electrically connected with the first end of the first resistor R1, the second end of the first resistor R1 is electrically connected with a switching power supply, the switching power supply is a 16V direct-current power supply, one end of the second resistor R2 is electrically connected with the second end of the first resistor R1, the other end of the second resistor R2 is electrically connected with one end of the third resistor R11, the other end of the third resistor R11 is electrically connected with the anode of the controllable precise voltage-stabilizing source U3, and the connection point of the second resistor U2 and the third resistor U11 is electrically connected with the reference electrode of the controllable precise voltage-stabilizing source U3 and the second port of.
The emitter of a secondary side transistor of the optical coupler U2 is grounded, and the collector of a secondary side diode of the optical coupler U2 is electrically connected with the power chip.
And a primary diode of the optocoupler U2 is connected in parallel with a fourth resistor R7.
The simplified constant-voltage constant-current control circuit further comprises a fifth resistor R8 and a first capacitor C1, a connection point of a first port of the MCU and a second input end of the comparator U1 is electrically connected with one end of the fifth resistor R8 and one end of the first capacitor C1 respectively, and the other end of the fifth resistor R8 and the other end of the first capacitor C1 are grounded.
The simplified constant-voltage constant-current control circuit further comprises a resistor R3, a resistor R5 and a resistor R10, a connection point of a first port of the MCU and a second input end of the comparator U1 is electrically connected with one end of the resistor R3, the other end of the resistor R3 is connected with a switching power supply, the switching power supply is a 5V direct-current power supply, the resistor R5 is connected between the first port of the MCU and the second input end of the comparator U1 in series, and the resistor R10 is connected to an output line of the second port of the MCU in series.
And a second capacitor C2 is connected between the collector and the emitter of the secondary side transistor of the optocoupler U2.
The simplified constant-voltage constant-current control circuit further comprises a sixth resistor R6 and a third capacitor C3, wherein the sixth resistor R6 and the third capacitor C3 are connected in series and then connected in parallel between the second input end of the comparator U1 and the output end of the comparator U1.
When the sampling end CS is used for voltage sampling, the constant voltage control can be implemented as follows: the sampling value of the sampling end CS is compared with a reference value output by a first port of the MCU, when the value of the sampled output voltage is higher than the reference value, the output end of the comparator U1 outputs high voltage to conduct the triode Q1, the voltage at the controllable precise voltage stabilizing source U3 is pulled down, and then the voltage is fed back to a power chip at the front end by the optical coupler U2, the duty ratio of the power chip is adjusted to reduce the output voltage, and when the sampling value of the output voltage is lower than the reference value, the duty ratio is increased by the power chip and is adjusted repeatedly and continuously, so that the output voltage reaches dynamic balance.
When the sampling end CS samples current, constant current control can be implemented, specifically as follows: the sampling value of the sampling end CS is compared with a reference value output by a first port of the MCU, when the sampling value is higher than the reference value (the sampling value is a voltage signal), the output end of the comparator U1 outputs high voltage to conduct the triode Q1, the voltage at the controllable precise voltage stabilizing source U3 is pulled down, and then the voltage is fed back to a power chip at the front end by the optical coupler U2, the power chip adjusts the duty ratio to reduce the output current, and when the sampling value of the output current is lower than the reference value, the power chip increases the duty ratio and repeatedly and continuously adjusts the duty ratio to enable the output current to reach dynamic balance.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention, but should not be construed as limiting the claims, and the present invention is not limited to the above-described embodiments, but may be modified in various ways. In summary, all changes that can be made within the scope of the independent claims of the present invention are within the scope of the present invention.
Claims (5)
1. A simplified constant-voltage constant-current control circuit is characterized by comprising a sampling end, an MCU (microprogrammed control Unit), a comparator, a triode, a controllable precise voltage-stabilizing source, an optocoupler, a first resistor, a second resistor, a third resistor and a power chip, wherein the power chip is used for adjusting the output voltage/current of equipment, and the sampling end is used for sampling the output voltage/current of the equipment;
the MCU is provided with a first port and a second port;
the comparator is provided with a first input end, a second input end and an output end;
the sampling end is electrically connected with the first input end of the comparator, the first port of the MCU is electrically connected with the second input end of the comparator, the output end of the comparator is electrically connected with the base electrode of the triode, the collector electrode of the triode is electrically connected with the reference electrode of the controllable precise voltage-stabilizing source, and the emitter electrode of the triode is grounded;
the anode of the controllable precise voltage-stabilizing source is grounded, the cathode of the controllable precise voltage-stabilizing source is connected with the cathode of the primary side diode of the optocoupler, the anode of the primary side diode of the optocoupler is electrically connected with the first end of the first resistor, the second end of the first resistor is electrically connected with the switching power supply, one end of the second resistor is electrically connected with the second end of the first resistor, the other end of the second resistor is electrically connected with one end of the third resistor, the other end of the third resistor is electrically connected with the anode of the controllable precise voltage-stabilizing source, and the connection point of the second resistor and the third resistor is respectively electrically connected with the reference electrode of the controllable precise voltage-stabilizing source and the second port of the MCU;
the emitter of the secondary transistor of the optical coupler is grounded, and the collector of the secondary diode of the optical coupler is electrically connected with the power chip.
2. The simplified constant-voltage constant-current control circuit as claimed in claim 1, wherein a fourth resistor is connected in parallel to a primary diode of the optocoupler.
3. The simplified constant-voltage constant-current control circuit as claimed in claim 2, wherein the simplified constant-voltage constant-current control circuit further comprises a fifth resistor and a first capacitor, a connection point between the first port of the MCU and the second input terminal of the comparator is electrically connected to one end of the fifth resistor and one end of the first capacitor, respectively, and the other end of the fifth resistor and the other end of the first capacitor are both grounded.
4. The simplified constant-voltage constant-current control circuit as claimed in claim 3, wherein a second capacitor is connected between the collector and emitter of the secondary transistor of the optocoupler.
5. The simplified constant-voltage constant-current control circuit as claimed in claim 4, wherein the simplified constant-voltage constant-current control circuit further comprises a sixth resistor and a third capacitor, and the sixth resistor and the third capacitor are connected in series and then connected in parallel between the second input terminal of the comparator and the output terminal of the comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020760558.0U CN211628105U (en) | 2020-05-09 | 2020-05-09 | Simplified constant-voltage constant-current control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020760558.0U CN211628105U (en) | 2020-05-09 | 2020-05-09 | Simplified constant-voltage constant-current control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN211628105U true CN211628105U (en) | 2020-10-02 |
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| CN202020760558.0U Active CN211628105U (en) | 2020-05-09 | 2020-05-09 | Simplified constant-voltage constant-current control circuit |
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2020
- 2020-05-09 CN CN202020760558.0U patent/CN211628105U/en active Active
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Denomination of utility model: A simplified constant voltage and constant current control circuit Effective date of registration: 20211029 Granted publication date: 20201002 Pledgee: Postal Savings Bank of China Limited by Share Ltd Xinchang branch Pledgor: XINCHANG BAIDE ELECTRONICS CO.,LTD. Registration number: Y2021330002084 |