CN2847646Y - High frequency charger with constant voltage and constant control circuit - Google Patents
High frequency charger with constant voltage and constant control circuit Download PDFInfo
- Publication number
- CN2847646Y CN2847646Y CN 200520044142 CN200520044142U CN2847646Y CN 2847646 Y CN2847646 Y CN 2847646Y CN 200520044142 CN200520044142 CN 200520044142 CN 200520044142 U CN200520044142 U CN 200520044142U CN 2847646 Y CN2847646 Y CN 2847646Y
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- circuit
- current
- control circuit
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- utility
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Abstract
The utility model relates to a high frequency charger with a constant voltage and constant current control circuit. The utility model comprises an input circuit, a switching circuit, a PWM circuit (3), an output circuit, a voltage control circuit (1) and a current control circuit (2), wherein the current control circuit comprises a current sampling resistor (201); the current sampling resistor (201) converts sampling current signals from the output end of the high frequency charger into voltage signals to control the conduction ratio of a triode (202) so as to control the change of the brightness of an optical coupling diode (102), and sampling signals are fed back to the PWM circuit (3) through the changes of the brightness of the optical coupling diode (102) so as to achieve constant current control. The utility model can effectively control an output current of the high frequency charger, the circuit is brief, adopted elements are few and thus the utility model can save cost.
Description
Technical field
The utility model relates to a kind of high-frequency charger, refers to a kind of high-frequency charger with constant pressure and flow control circuit especially.
Background technology
Current high-frequency charger commonly used is only done the control of constant voltage mostly, causes electric current effectively to control; Even some high-frequency charger is provided with constant-current control circuit, but this circuit is more complicated also, as disclosed WO03071657 patent those disclosed herein in UKPO's on August 23rd, 2003, by detecting the pulse ratio of charger transformer output switching pulse, while detection peak voltage, detection pulse ratio and peak voltage signal are carried out differential ratio, thereby negative feedback modulation dc-input power is to reach the control purpose that reduces electric current output, this scheme complex circuit, the manufacturing cost height, the inventor makes improvement at above-mentioned defective.
Summary of the invention
The purpose of this utility model is to realize by more simple and effective circuit the control of high-frequency charger constant current constant voltage.
The utility model is achieved through the following technical solutions: a kind of high-frequency charger with constant pressure and flow control circuit, it comprises: input circuit, switching circuit, pwm circuit, output circuit, voltage control circuit and current control circuit, this current control circuit comprises: a current sampling device, be connected in the charger output, current signal is converted into voltage signal; One voltage signal amplifying device amplifies above-mentioned voltage signal; One Signal Spacing feedback device will amplify the back voltage signal and feed back to pwm circuit.This Signal Spacing feedback device links to each other with voltage control circuit simultaneously, and the sampled signal of voltage control circuit is fed back to pwm circuit.It is characterized in that: this signal amplifying apparatus is a triode.
The utility model can effectively be controlled the high-frequency charger output current, and circuit is succinct, adopts element few, uses triode can save cost greatly.
Description of drawings
Fig. 1 is the utility model workflow block diagram
Fig. 2 is the utility model circuit diagram
Embodiment
Below in conjunction with accompanying drawing execution mode of the present utility model is elaborated:
As shown in Figure 1: the utility model comprises: input circuit, switching circuit, pwm circuit (3), output circuit, voltage control circuit and current control circuit; As shown in Figure 2: voltage control circuit (1) is made up of with optocoupler diode (102) accurate adjustable reference power supply LM431 (101), and when voltage was higher than setting voltage, the optocoupler LED lightness increased, and strengthened the feedback to the prime pulsewidth, and output voltage is reduced.When voltage was lower than setting voltage, the brightness of optocoupler diode reduced, and weakened the feedback to the prime pulsewidth, thereby output voltage is raise, and reached voltage regulation result.Current control circuit (2) comprises current sampling resistor (201), triode (202) and optocoupler diode (102) composition, current sampling resistor (201) is converted into voltage signal with current signal, deliver to the base stage of triode (202), make triode (202) work, cooperate optocoupler diode (102) to feed back to pwm circuit (3).When the voltage signal of obtaining from current sampling resistor (201) is high (when electric current is big), the conducting degree of triode (202) is strengthened, thereby the brightness of optocoupler diode (102) is increased, reinforcement is to the feedback of prime pulsewidth pwm circuit (3), output voltage is reduced, thereby reach the purpose that reduces electric current, when the voltage signal of obtaining from current sampling resistor (201) is low (electric current hour), the conducting degree of triode (202) is reduced, thereby the brightness of optocoupler diode (102) is reduced, weaken feedback, output voltage is increased prime pulsewidth pwm circuit (3), thereby reach the purpose that increases electric current, reach the constant current effect.
The utility model protection range is not limited in this embodiment, and the various conversion that all those of ordinary skills know all fall within the protection range.
Claims (1)
1. high-frequency charger with constant pressure and flow control circuit, it comprises: input circuit, switching circuit, pwm circuit, output circuit, voltage control circuit (1) and current control circuit (2), this current control circuit (2) comprising: a current sampling device (201), be connected in the charger output, current signal is converted into voltage signal, one voltage signal amplifying device (202) amplifies above-mentioned voltage signal, one Signal Spacing feedback device (102) will amplify the back voltage signal and feed back to pwm circuit (3); It is characterized in that: this signal amplifying apparatus (202) is a triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520044142 CN2847646Y (en) | 2005-08-08 | 2005-08-08 | High frequency charger with constant voltage and constant control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520044142 CN2847646Y (en) | 2005-08-08 | 2005-08-08 | High frequency charger with constant voltage and constant control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2847646Y true CN2847646Y (en) | 2006-12-13 |
Family
ID=37513068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520044142 Expired - Lifetime CN2847646Y (en) | 2005-08-08 | 2005-08-08 | High frequency charger with constant voltage and constant control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2847646Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101013850B (en) * | 2006-12-21 | 2010-04-21 | 中国科学院电工研究所 | High-frequency constant-current charging power of high-voltage capacitor supplied with accumulator |
| CN101888108A (en) * | 2010-06-30 | 2010-11-17 | 濮阳三友电器有限公司 | Circuit for charging machine |
| CN102999073A (en) * | 2011-09-08 | 2013-03-27 | 洛阳嘉盛电源科技有限公司 | Constant-voltage and constant-current control circuit applied to power supply technology |
-
2005
- 2005-08-08 CN CN 200520044142 patent/CN2847646Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101013850B (en) * | 2006-12-21 | 2010-04-21 | 中国科学院电工研究所 | High-frequency constant-current charging power of high-voltage capacitor supplied with accumulator |
| CN101888108A (en) * | 2010-06-30 | 2010-11-17 | 濮阳三友电器有限公司 | Circuit for charging machine |
| CN102999073A (en) * | 2011-09-08 | 2013-03-27 | 洛阳嘉盛电源科技有限公司 | Constant-voltage and constant-current control circuit applied to power supply technology |
| CN102999073B (en) * | 2011-09-08 | 2015-04-22 | 洛阳嘉盛电源科技有限公司 | Constant-voltage and constant-current control circuit applied to power supply technology |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20150808 Granted publication date: 20061213 |
|
| EXPY | Termination of patent right or utility model |